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cmd/clef, signer: initial poc of the standalone signer (#16154)

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* signer: introduce external signer command

* cmd/signer, rpc: Implement new signer. Add info about remote user to Context

* signer: refactored request/response, made use of urfave.cli

* cmd/signer: Use common flags

* cmd/signer: methods to validate calldata against abi

* cmd/signer: work on abi parser

* signer: add mutex around UI

* cmd/signer: add json 4byte directory, remove passwords from api

* cmd/signer: minor changes

* cmd/signer: Use ErrRequestDenied, enable lightkdf

* cmd/signer: implement tests

* cmd/signer: made possible for UI to modify tx parameters

* cmd/signer: refactors, removed channels in ui comms, added UI-api via stdin/out

* cmd/signer: Made lowercase json-definitions, added UI-signer test functionality

* cmd/signer: update documentation

* cmd/signer: fix bugs, improve abi detection, abi argument display

* cmd/signer: minor change in json format

* cmd/signer: rework json communication

* cmd/signer: implement mixcase addresses in API, fix json id bug

* cmd/signer: rename fromaccount, update pythonpoc with new json encoding format

* cmd/signer: make use of new abi interface

* signer: documentation

* signer/main: remove redundant  option

* signer: implement audit logging

* signer: create package 'signer', minor changes

* common: add 0x-prefix to mixcaseaddress in json marshalling + validation

* signer, rules, storage: implement rules + ephemeral storage for signer rules

* signer: implement OnApprovedTx, change signing response (API BREAKAGE)

* signer: refactoring + documentation

* signer/rules: implement dispatching to next handler

* signer: docs

* signer/rules: hide json-conversion from users, ensure context is cleaned

* signer: docs

* signer: implement validation rules, change signature of call_info

* signer: fix log flaw with string pointer

* signer: implement custom 4byte databsae that saves submitted signatures

* signer/storage: implement aes-gcm-backed credential storage

* accounts: implement json unmarshalling of url

* signer: fix listresponse, fix gas->uint64

* node: make http/ipc start methods public

* signer: add ipc capability+review concerns

* accounts: correct docstring

* signer: address review concerns

* rpc: go fmt -s

* signer: review concerns+ baptize Clef

* signer,node: move Start-functions to separate file

* signer: formatting
This commit is contained in:
Martin Holst Swende 2018-04-16 14:04:32 +02:00 committed by Péter Szilágyi
parent de2a7bb764
commit ec3db0f56c
37 changed files with 6281 additions and 92 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
accounts/url.go
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@ -74,6 +74,22 @@ func (u URL) MarshalJSON() ([]byte, error) {
return json.Marshal(u.String()) return json.Marshal(u.String())
} }
// UnmarshalJSON parses url.
func (u *URL) UnmarshalJSON(input []byte) error {
var textUrl string
err := json.Unmarshal(input, &textUrl)
if err != nil {
return err
}
url, err := parseURL(textUrl)
if err != nil {
return err
}
u.Scheme = url.Scheme
u.Path = url.Path
return nil
}
// Cmp compares x and y and returns: // Cmp compares x and y and returns:
// //
// -1 if x < y // -1 if x < y

2
accounts/usbwallet/hub.go
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@ -127,7 +127,7 @@ func (hub *Hub) refreshWallets() {
// breaking the Ledger protocol if that is waiting for user confirmation. This // breaking the Ledger protocol if that is waiting for user confirmation. This
// is a bug acknowledged at Ledger, but it won't be fixed on old devices so we // is a bug acknowledged at Ledger, but it won't be fixed on old devices so we
// need to prevent concurrent comms ourselves. The more elegant solution would // need to prevent concurrent comms ourselves. The more elegant solution would
// be to ditch enumeration in favor of hutplug events, but that don't work yet // be to ditch enumeration in favor of hotplug events, but that don't work yet
// on Windows so if we need to hack it anyway, this is more elegant for now. // on Windows so if we need to hack it anyway, this is more elegant for now.
hub.commsLock.Lock() hub.commsLock.Lock()
if hub.commsPend > 0 { // A confirmation is pending, don't refresh if hub.commsPend > 0 { // A confirmation is pending, don't refresh

2
accounts/usbwallet/wallet.go
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@ -99,7 +99,7 @@ type wallet struct {
// //
// As such, a hardware wallet needs two locks to function correctly. A state // As such, a hardware wallet needs two locks to function correctly. A state
// lock can be used to protect the wallet's software-side internal state, which // lock can be used to protect the wallet's software-side internal state, which
// must not be held exlusively during hardware communication. A communication // must not be held exclusively during hardware communication. A communication
// lock can be used to achieve exclusive access to the device itself, this one // lock can be used to achieve exclusive access to the device itself, this one
// however should allow "skipping" waiting for operations that might want to // however should allow "skipping" waiting for operations that might want to
// use the device, but can live without too (e.g. account self-derivation). // use the device, but can live without too (e.g. account self-derivation).

1
cmd/clef/4byte.json Normal file
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File diff suppressed because one or more lines are too long

864
cmd/clef/README.md Normal file
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@ -0,0 +1,864 @@
Clef
----
Clef can be used to sign transactions and data and is meant as a replacement for geth's account management.
This allows DApps not to depend on geth's account management. When a DApp wants to sign data it can send the data to
the signer, the signer will then provide the user with context and asks the user for permission to sign the data. If
the users grants the signing request the signer will send the signature back to the DApp.
This setup allows a DApp to connect to a remote Ethereum node and send transactions that are locally signed. This can
help in situations when a DApp is connected to a remote node because a local Ethereum node is not available, not
synchronised with the chain or a particular Ethereum node that has no built-in (or limited) account management.
Clef can run as a daemon on the same machine, or off a usb-stick like [usb armory](https://inversepath.com/usbarmory),
or a separate VM in a [QubesOS](https://www.qubes-os.org/) type os setup.
## Command line flags
Clef accepts the following command line options:
```
COMMANDS:
init Initialize the signer, generate secret storage
attest Attest that a js-file is to be used
addpw Store a credential for a keystore file
help Shows a list of commands or help for one command
GLOBAL OPTIONS:
--loglevel value log level to emit to the screen (default: 4)
--keystore value Directory for the keystore (default: "$HOME/.ethereum/keystore")
--configdir value Directory for clef configuration (default: "$HOME/.clef")
--networkid value Network identifier (integer, 1=Frontier, 2=Morden (disused), 3=Ropsten, 4=Rinkeby) (default: 1)
--lightkdf Reduce key-derivation RAM & CPU usage at some expense of KDF strength
--nousb Disables monitoring for and managing USB hardware wallets
--rpcaddr value HTTP-RPC server listening interface (default: "localhost")
--rpcport value HTTP-RPC server listening port (default: 8550)
--signersecret value A file containing the password used to encrypt signer credentials, e.g. keystore credentials and ruleset hash
--4bytedb value File containing 4byte-identifiers (default: "./4byte.json")
--4bytedb-custom value File used for writing new 4byte-identifiers submitted via API (default: "./4byte-custom.json")
--auditlog value File used to emit audit logs. Set to "" to disable (default: "audit.log")
--rules value Enable rule-engine (default: "rules.json")
--stdio-ui Use STDIN/STDOUT as a channel for an external UI. This means that an STDIN/STDOUT is used for RPC-communication with a e.g. a graphical user interface, and can be used when the signer is started by an external process.
--stdio-ui-test Mechanism to test interface between signer and UI. Requires 'stdio-ui'.
--help, -h show help
--version, -v print the version
```
Example:
```
signer -keystore /my/keystore -chainid 4
```
Check out the [tutorial](tutorial.md) for some concrete examples on how the signer works.
## Security model
The security model of the signer is as follows:
* One critical component (the signer binary / daemon) is responsible for handling cryptographic operations: signing, private keys, encryption/decryption of keystore files.
* The signer binary has a well-defined 'external' API.
* The 'external' API is considered UNTRUSTED.
* The signer binary also communicates with whatever process that invoked the binary, via stdin/stdout.
* This channel is considered 'trusted'. Over this channel, approvals and passwords are communicated.
The general flow for signing a transaction using e.g. geth is as follows:
![image](sign_flow.png)
In this case, `geth` would be started with `--externalsigner=http://localhost:8550` and would relay requests to `eth.sendTransaction`.
## TODOs
Some snags and todos
* [ ] The signer should take a startup param "--no-change", for UIs that do not contain the capability
to perform changes to things, only approve/deny. Such a UI should be able to start the signer in
a more secure mode by telling it that it only wants approve/deny capabilities.
* [x] It would be nice if the signer could collect new 4byte-id:s/method selectors, and have a
secondary database for those (`4byte_custom.json`). Users could then (optionally) submit their collections for
inclusion upstream.
* It should be possible to configure the signer to check if an account is indeed known to it, before
passing on to the UI. The reason it currently does not, is that it would make it possible to enumerate
accounts if it immediately returned "unknown account".
* [x] It should be possible to configure the signer to auto-allow listing (certain) accounts, instead of asking every time.
* [x] Done Upon startup, the signer should spit out some info to the caller (particularly important when executed in `stdio-ui`-mode),
invoking methods with the following info:
* [x] Version info about the signer
* [x] Address of API (http/ipc)
* [ ] List of known accounts
* [ ] Have a default timeout on signing operations, so that if the user has not answered withing e.g. 60 seconds, the request is rejected.
* [ ] `account_signRawTransaction`
* [ ] `account_bulkSignTransactions([] transactions)` should
* only exist if enabled via config/flag
* only allow non-data-sending transactions
* all txs must use the same `from`-account
* let the user confirm, showing
* the total amount
* the number of unique recipients
* Geth todos
- The signer should pass the `Origin` header as call-info to the UI. As of right now, the way that info about the request is
put together is a bit of a hack into the http server. This could probably be greatly improved
- Relay: Geth should be started in `geth --external_signer localhost:8550`.
- Currently, the Geth APIs use `common.Address` in the arguments to transaction submission (e.g `to` field). This
type is 20 `bytes`, and is incapable of carrying checksum information. The signer uses `common.MixedcaseAddress`, which
retains the original input.
- The Geth api should switch to use the same type, and relay `to`-account verbatim to the external api.
* [x] Storage
* [x] An encrypted key-value storage should be implemented
* See [rules.md](rules.md) for more info about this.
* Another potential thing to introduce is pairing.
* To prevent spurious requests which users just accept, implement a way to "pair" the caller with the signer (external API).
* Thus geth/mist/cpp would cryptographically handshake and afterwards the caller would be allowed to make signing requests.
* This feature would make the addition of rules less dangerous.
* Wallets / accounts. Add API methods for wallets.
## Communication
### External API
The signer listens to HTTP requests on `rpcaddr`:`rpcport`, with the same JSONRPC standard as Geth. The messages are
expected to be JSON [jsonrpc 2.0 standard](http://www.jsonrpc.org/specification).
Some of these call can require user interaction. Clients must be aware that responses
may be delayed significanlty or may never be received if a users decides to ignore the confirmation request.
The External API is **untrusted** : it does not accept credentials over this api, nor does it expect
that requests have any authority.
### UI API
The signer has one native console-based UI, for operation without any standalone tools.
However, there is also an API to communicate with an external UI. To enable that UI,
the signer needs to be executed with the `--stdio-ui` option, which allocates the
`stdin`/`stdout` for the UI-api.
An example (insecure) proof-of-concept of has been implemented in `pythonsigner.py`.
The model is as follows:
* The user starts the UI app (`pythonsigner.py`).
* The UI app starts the `signer` with `--stdio-ui`, and listens to the
process output for confirmation-requests.
* The `signer` opens the external http api.
* When the `signer` receives requests, it sends a `jsonrpc` request via `stdout`.
* The UI app prompts the user accordingly, and responds to the `signer`
* The `signer` signs (or not), and responds to the original request.
## External API
See the [external api changelog](extapi_changelog.md) for information about changes to this API.
### Encoding
- number: positive integers that are hex encoded
- data: hex encoded data
- string: ASCII string
All hex encoded values must be prefixed with `0x`.
## Methods
### account_new
#### Create new password protected account
The signer will generate a new private key, encrypts it according to [web3 keystore spec](https://github.com/ethereum/wiki/wiki/Web3-Secret-Storage-Definition) and stores it in the keystore directory.
The client is responsible for creating a backup of the keystore. If the keystore is lost there is no method of retrieving lost accounts.
#### Arguments
None
#### Result
- address [string]: account address that is derived from the generated key
- url [string]: location of the keyfile
#### Sample call
```json
{
"id": 0,
"jsonrpc": "2.0",
"method": "account_new",
"params": []
}
{
"id": 0,
"jsonrpc": "2.0",
"result": {
"address": "0xbea9183f8f4f03d427f6bcea17388bdff1cab133",
"url": "keystore:///my/keystore/UTC--2017-08-24T08-40-15.419655028Z--bea9183f8f4f03d427f6bcea17388bdff1cab133"
}
}
```
### account_list
#### List available accounts
List all accounts that this signer currently manages
#### Arguments
None
#### Result
- array with account records:
- account.address [string]: account address that is derived from the generated key
- account.type [string]: type of the
- account.url [string]: location of the account
#### Sample call
```json
{
"id": 1,
"jsonrpc": "2.0",
"method": "account_list"
}
{
"id": 1,
"jsonrpc": "2.0",
"result": [
{
"address": "0xafb2f771f58513609765698f65d3f2f0224a956f",
"type": "account",
"url": "keystore:///tmp/keystore/UTC--2017-08-24T07-26-47.162109726Z--afb2f771f58513609765698f65d3f2f0224a956f"
},
{
"address": "0xbea9183f8f4f03d427f6bcea17388bdff1cab133",
"type": "account",
"url": "keystore:///tmp/keystore/UTC--2017-08-24T08-40-15.419655028Z--bea9183f8f4f03d427f6bcea17388bdff1cab133"
}
]
}
```
### account_signTransaction
#### Sign transactions
Signs a transactions and responds with the signed transaction in RLP encoded form.
#### Arguments
2. transaction object:
- `from` [address]: account to send the transaction from
- `to` [address]: receiver account. If omitted or `0x`, will cause contract creation.
- `gas` [number]: maximum amount of gas to burn
- `gasPrice` [number]: gas price
- `value` [number:optional]: amount of Wei to send with the transaction
- `data` [data:optional]: input data
- `nonce` [number]: account nonce
3. method signature [string:optional]
- The method signature, if present, is to aid decoding the calldata. Should consist of `methodname(paramtype,...)`, e.g. `transfer(uint256,address)`. The signer may use this data to parse the supplied calldata, and show the user. The data, however, is considered totally untrusted, and reliability is not expected.
#### Result
- signed transaction in RLP encoded form [data]
#### Sample call
```json
{
"id": 2,
"jsonrpc": "2.0",
"method": "account_signTransaction",
"params": [
{
"from": "0x1923f626bb8dc025849e00f99c25fe2b2f7fb0db",
"gas": "0x55555",
"gasPrice": "0x1234",
"input": "0xabcd",
"nonce": "0x0",
"to": "0x07a565b7ed7d7a678680a4c162885bedbb695fe0",
"value": "0x1234"
}
]
}
```
Response
```json
{
"jsonrpc": "2.0",
"id": 67,
"error": {
"code": -32000,
"message": "Request denied"
}
}
```
#### Sample call with ABI-data
```json
{
"jsonrpc": "2.0",
"method": "account_signTransaction",
"params": [
{
"from": "0x694267f14675d7e1b9494fd8d72fefe1755710fa",
"gas": "0x333",
"gasPrice": "0x1",
"nonce": "0x0",
"to": "0x07a565b7ed7d7a678680a4c162885bedbb695fe0",
"value": "0x0",
"data": "0x4401a6e40000000000000000000000000000000000000000000000000000000000000012"
},
"safeSend(address)"
],
"id": 67
}
```
Response
```json
{
"jsonrpc": "2.0",
"id": 67,
"result": {
"raw": "0xf88380018203339407a565b7ed7d7a678680a4c162885bedbb695fe080a44401a6e4000000000000000000000000000000000000000000000000000000000000001226a0223a7c9bcf5531c99be5ea7082183816eb20cfe0bbc322e97cc5c7f71ab8b20ea02aadee6b34b45bb15bc42d9c09de4a6754e7000908da72d48cc7704971491663",
"tx": {
"nonce": "0x0",
"gasPrice": "0x1",
"gas": "0x333",
"to": "0x07a565b7ed7d7a678680a4c162885bedbb695fe0",
"value": "0x0",
"input": "0x4401a6e40000000000000000000000000000000000000000000000000000000000000012",
"v": "0x26",
"r": "0x223a7c9bcf5531c99be5ea7082183816eb20cfe0bbc322e97cc5c7f71ab8b20e",
"s": "0x2aadee6b34b45bb15bc42d9c09de4a6754e7000908da72d48cc7704971491663",
"hash": "0xeba2df809e7a612a0a0d444ccfa5c839624bdc00dd29e3340d46df3870f8a30e"
}
}
}
```
Bash example:
```bash
#curl -H "Content-Type: application/json" -X POST --data '{"jsonrpc":"2.0","method":"account_signTransaction","params":[{"from":"0x694267f14675d7e1b9494fd8d72fefe1755710fa","gas":"0x333","gasPrice":"0x1","nonce":"0x0","to":"0x07a565b7ed7d7a678680a4c162885bedbb695fe0", "value":"0x0", "data":"0x4401a6e40000000000000000000000000000000000000000000000000000000000000012"},"safeSend(address)"],"id":67}' http://localhost:8550/
{"jsonrpc":"2.0","id":67,"result":{"raw":"0xf88380018203339407a565b7ed7d7a678680a4c162885bedbb695fe080a44401a6e4000000000000000000000000000000000000000000000000000000000000001226a0223a7c9bcf5531c99be5ea7082183816eb20cfe0bbc322e97cc5c7f71ab8b20ea02aadee6b34b45bb15bc42d9c09de4a6754e7000908da72d48cc7704971491663","tx":{"nonce":"0x0","gasPrice":"0x1","gas":"0x333","to":"0x07a565b7ed7d7a678680a4c162885bedbb695fe0","value":"0x0","input":"0x4401a6e40000000000000000000000000000000000000000000000000000000000000012","v":"0x26","r":"0x223a7c9bcf5531c99be5ea7082183816eb20cfe0bbc322e97cc5c7f71ab8b20e","s":"0x2aadee6b34b45bb15bc42d9c09de4a6754e7000908da72d48cc7704971491663","hash":"0xeba2df809e7a612a0a0d444ccfa5c839624bdc00dd29e3340d46df3870f8a30e"}}}
```
### account_sign
#### Sign data
Signs a chunk of data and returns the calculated signature.
#### Arguments
- account [address]: account to sign with
- data [data]: data to sign
#### Result
- calculated signature [data]
#### Sample call
```json
{
"id": 3,
"jsonrpc": "2.0",
"method": "account_sign",
"params": [
"0x1923f626bb8dc025849e00f99c25fe2b2f7fb0db",
"0xaabbccdd"
]
}
```
Response
```json
{
"id": 3,
"jsonrpc": "2.0",
"result": "0x5b6693f153b48ec1c706ba4169960386dbaa6903e249cc79a8e6ddc434451d417e1e57327872c7f538beeb323c300afa9999a3d4a5de6caf3be0d5ef832b67ef1c"
}
```
### account_ecRecover
#### Recover address
Derive the address from the account that was used to sign data from the data and signature.
#### Arguments
- data [data]: data that was signed
- signature [data]: the signature to verify
#### Result
- derived account [address]
#### Sample call
```json
{
"id": 4,
"jsonrpc": "2.0",
"method": "account_ecRecover",
"params": [
"0xaabbccdd",
"0x5b6693f153b48ec1c706ba4169960386dbaa6903e249cc79a8e6ddc434451d417e1e57327872c7f538beeb323c300afa9999a3d4a5de6caf3be0d5ef832b67ef1c"
]
}
```
Response
```json
{
"id": 4,
"jsonrpc": "2.0",
"result": "0x1923f626bb8dc025849e00f99c25fe2b2f7fb0db"
}
```
### account_import
#### Import account
Import a private key into the keystore. The imported key is expected to be encrypted according to the web3 keystore
format.
#### Arguments
- account [object]: key in [web3 keystore format](https://github.com/ethereum/wiki/wiki/Web3-Secret-Storage-Definition) (retrieved with account_export)
#### Result
- imported key [object]:
- key.address [address]: address of the imported key
- key.type [string]: type of the account
- key.url [string]: key URL
#### Sample call
```json
{
"id": 6,
"jsonrpc": "2.0",
"method": "account_import",
"params": [
{
"address": "c7412fc59930fd90099c917a50e5f11d0934b2f5",
"crypto": {
"cipher": "aes-128-ctr",
"cipherparams": {
"iv": "401c39a7c7af0388491c3d3ecb39f532"
},
"ciphertext": "eb045260b18dd35cd0e6d99ead52f8fa1e63a6b0af2d52a8de198e59ad783204",
"kdf": "scrypt",
"kdfparams": {
"dklen": 32,
"n": 262144,
"p": 1,
"r": 8,
"salt": "9a657e3618527c9b5580ded60c12092e5038922667b7b76b906496f021bb841a"
},
"mac": "880dc10bc06e9cec78eb9830aeb1e7a4a26b4c2c19615c94acb632992b952806"
},
"id": "09bccb61-b8d3-4e93-bf4f-205a8194f0b9",
"version": 3
},
]
}
```
Response
```json
{
"id": 6,
"jsonrpc": "2.0",
"result": {
"address": "0xc7412fc59930fd90099c917a50e5f11d0934b2f5",
"type": "account",
"url": "keystore:///tmp/keystore/UTC--2017-08-24T11-00-42.032024108Z--c7412fc59930fd90099c917a50e5f11d0934b2f5"
}
}
```
### account_export
#### Export account from keystore
Export a private key from the keystore. The exported private key is encrypted with the original passphrase. When the
key is imported later this passphrase is required.
#### Arguments
- account [address]: export private key that is associated with this account
#### Result
- exported key, see [web3 keystore format](https://github.com/ethereum/wiki/wiki/Web3-Secret-Storage-Definition) for
more information
#### Sample call
```json
{
"id": 5,
"jsonrpc": "2.0",
"method": "account_export",
"params": [
"0xc7412fc59930fd90099c917a50e5f11d0934b2f5"
]
}
```
Response
```json
{
"id": 5,
"jsonrpc": "2.0",
"result": {
"address": "c7412fc59930fd90099c917a50e5f11d0934b2f5",
"crypto": {
"cipher": "aes-128-ctr",
"cipherparams": {
"iv": "401c39a7c7af0388491c3d3ecb39f532"
},
"ciphertext": "eb045260b18dd35cd0e6d99ead52f8fa1e63a6b0af2d52a8de198e59ad783204",
"kdf": "scrypt",
"kdfparams": {
"dklen": 32,
"n": 262144,
"p": 1,
"r": 8,
"salt": "9a657e3618527c9b5580ded60c12092e5038922667b7b76b906496f021bb841a"
},
"mac": "880dc10bc06e9cec78eb9830aeb1e7a4a26b4c2c19615c94acb632992b952806"
},
"id": "09bccb61-b8d3-4e93-bf4f-205a8194f0b9",
"version": 3
}
}
```
## UI API
These methods needs to be implemented by a UI listener.
By starting the signer with the switch `--stdio-ui-test`, the signer will invoke all known methods, and expect the UI to respond with
denials. This can be used during development to ensure that the API is (at least somewhat) correctly implemented.
See `pythonsigner`, which can be invoked via `python3 pythonsigner.py test` to perform the 'denial-handshake-test'.
All methods in this API uses object-based parameters, so that there can be no mixups of parameters: each piece of data is accessed by key.
See the [ui api changelog](intapi_changelog.md) for information about changes to this API.
OBS! A slight deviation from `json` standard is in place: every request and response should be confined to a single line.
Whereas the `json` specification allows for linebreaks, linebreaks __should not__ be used in this communication channel, to make
things simpler for both parties.
### ApproveTx
Invoked when there's a transaction for approval.
#### Sample call
Here's a method invocation:
```bash
curl -i -H "Content-Type: application/json" -X POST --data '{"jsonrpc":"2.0","method":"account_signTransaction","params":[{"from":"0x694267f14675d7e1b9494fd8d72fefe1755710fa","gas":"0x333","gasPrice":"0x1","nonce":"0x0","to":"0x07a565b7ed7d7a678680a4c162885bedbb695fe0", "value":"0x0", "data":"0x4401a6e40000000000000000000000000000000000000000000000000000000000000012"},"safeSend(address)"],"id":67}' http://localhost:8550/
```
```json
{
"jsonrpc": "2.0",
"id": 1,
"method": "ApproveTx",
"params": [
{
"transaction": {
"from": "0x0x694267f14675d7e1b9494fd8d72fefe1755710fa",
"to": "0x0x07a565b7ed7d7a678680a4c162885bedbb695fe0",
"gas": "0x333",
"gasPrice": "0x1",
"value": "0x0",
"nonce": "0x0",
"data": "0x4401a6e40000000000000000000000000000000000000000000000000000000000000012",
"input": null
},
"call_info": [
{
"type": "WARNING",
"message": "Invalid checksum on to-address"
},
{
"type": "Info",
"message": "safeSend(address: 0x0000000000000000000000000000000000000012)"
}
],
"meta": {
"remote": "127.0.0.1:48486",
"local": "localhost:8550",
"scheme": "HTTP/1.1"
}
}
]
}
```
The same method invocation, but with invalid data:
```bash
curl -i -H "Content-Type: application/json" -X POST --data '{"jsonrpc":"2.0","method":"account_signTransaction","params":[{"from":"0x694267f14675d7e1b9494fd8d72fefe1755710fa","gas":"0x333","gasPrice":"0x1","nonce":"0x0","to":"0x07a565b7ed7d7a678680a4c162885bedbb695fe0", "value":"0x0", "data":"0x4401a6e40000000000000002000000000000000000000000000000000000000000000012"},"safeSend(address)"],"id":67}' http://localhost:8550/
```
```json
{
"jsonrpc": "2.0",
"id": 1,
"method": "ApproveTx",
"params": [
{
"transaction": {
"from": "0x0x694267f14675d7e1b9494fd8d72fefe1755710fa",
"to": "0x0x07a565b7ed7d7a678680a4c162885bedbb695fe0",
"gas": "0x333",
"gasPrice": "0x1",
"value": "0x0",
"nonce": "0x0",
"data": "0x4401a6e40000000000000002000000000000000000000000000000000000000000000012",
"input": null
},
"call_info": [
{
"type": "WARNING",
"message": "Invalid checksum on to-address"
},
{
"type": "WARNING",
"message": "Transaction data did not match ABI-interface: WARNING: Supplied data is stuffed with extra data. \nWant 0000000000000002000000000000000000000000000000000000000000000012\nHave 0000000000000000000000000000000000000000000000000000000000000012\nfor method safeSend(address)"
}
],
"meta": {
"remote": "127.0.0.1:48492",
"local": "localhost:8550",
"scheme": "HTTP/1.1"
}
}
]
}
```
One which has missing `to`, but with no `data`:
```json
{
"jsonrpc": "2.0",
"id": 3,
"method": "ApproveTx",
"params": [
{
"transaction": {
"from": "",
"to": null,
"gas": "0x0",
"gasPrice": "0x0",
"value": "0x0",
"nonce": "0x0",
"data": null,
"input": null
},
"call_info": [
{
"type": "CRITICAL",
"message": "Tx will create contract with empty code!"
}
],
"meta": {
"remote": "signer binary",
"local": "main",
"scheme": "in-proc"
}
}
]
}
```
### ApproveExport
Invoked when a request to export an account has been made.
#### Sample call
```json
{
"jsonrpc": "2.0",
"id": 7,
"method": "ApproveExport",
"params": [
{
"address": "0x0000000000000000000000000000000000000000",
"meta": {
"remote": "signer binary",
"local": "main",
"scheme": "in-proc"
}
}
]
}
```
### ApproveListing
Invoked when a request for account listing has been made.
#### Sample call
```json
{
"jsonrpc": "2.0",
"id": 5,
"method": "ApproveListing",
"params": [
{
"accounts": [
{
"type": "Account",
"url": "keystore:///home/bazonk/.ethereum/keystore/UTC--2017-11-20T14-44-54.089682944Z--123409812340981234098123409812deadbeef42",
"address": "0x123409812340981234098123409812deadbeef42"
},
{
"type": "Account",
"url": "keystore:///home/bazonk/.ethereum/keystore/UTC--2017-11-23T21-59-03.199240693Z--cafebabedeadbeef34098123409812deadbeef42",
"address": "0xcafebabedeadbeef34098123409812deadbeef42"
}
],
"meta": {
"remote": "signer binary",
"local": "main",
"scheme": "in-proc"
}
}
]
}
```
### ApproveSignData
#### Sample call
```json
{
"jsonrpc": "2.0",
"id": 4,
"method": "ApproveSignData",
"params": [
{
"address": "0x123409812340981234098123409812deadbeef42",
"raw_data": "0x01020304",
"message": "\u0019Ethereum Signed Message:\n4\u0001\u0002\u0003\u0004",
"hash": "0x7e3a4e7a9d1744bc5c675c25e1234ca8ed9162bd17f78b9085e48047c15ac310",
"meta": {
"remote": "signer binary",
"local": "main",
"scheme": "in-proc"
}
}
]
}
```
### ShowInfo
The UI should show the info to the user. Does not expect response.
#### Sample call
```json
{
"jsonrpc": "2.0",
"id": 9,
"method": "ShowInfo",
"params": [
{
"text": "Tests completed"
}
]
}
```
### ShowError
The UI should show the info to the user. Does not expect response.
```json
{
"jsonrpc": "2.0",
"id": 2,
"method": "ShowError",
"params": [
{
"text": "Testing 'ShowError'"
}
]
}
```
### OnApproved
`OnApprovedTx` is called when a transaction has been approved and signed. The call contains the return value that will be sent to the external caller. The return value from this method is ignored - the reason for having this callback is to allow the ruleset to keep track of approved transactions.
When implementing rate-limited rules, this callback should be used.
TLDR; Use this method to keep track of signed transactions, instead of using the data in `ApproveTx`.
### OnSignerStartup
This method provide the UI with information about what API version the signer uses (both internal and external) aswell as build-info and external api,
in k/v-form.
Example call:
```json
{
"jsonrpc": "2.0",
"id": 1,
"method": "OnSignerStartup",
"params": [
{
"info": {
"extapi_http": "http://localhost:8550",
"extapi_ipc": null,
"extapi_version": "2.0.0",
"intapi_version": "1.2.0"
}
}
]
}
```
### Rules for UI apis
A UI should conform to the following rules.
* A UI MUST NOT load any external resources that were not embedded/part of the UI package.
* For example, not load icons, stylesheets from the internet
* Not load files from the filesystem, unless they reside in the same local directory (e.g. config files)
* A Graphical UI MUST show the blocky-identicon for ethereum addresses.
* A UI MUST warn display approproate warning if the destination-account is formatted with invalid checksum.
* A UI MUST NOT open any ports or services
* The signer opens the public port
* A UI SHOULD verify the permissions on the signer binary, and refuse to execute or warn if permissions allow non-user write.
* A UI SHOULD inform the user about the `SHA256` or `MD5` hash of the binary being executed
* A UI SHOULD NOT maintain a secondary storage of data, e.g. list of accounts
* The signer provides accounts
* A UI SHOULD, to the best extent possible, use static linking / bundling, so that requried libraries are bundled
along with the UI.

25
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@ -0,0 +1,25 @@
### Changelog for external API
#### 2.0.0
* Commit `73abaf04b1372fa4c43201fb1b8019fe6b0a6f8d`, move `from` into `transaction` object in `signTransaction`. This
makes the `accounts_signTransaction` identical to the old `eth_signTransaction`.
#### 1.0.0
Initial release.
### Versioning
The API uses [semantic versioning](https://semver.org/).
TLDR; Given a version number MAJOR.MINOR.PATCH, increment the:
* MAJOR version when you make incompatible API changes,
* MINOR version when you add functionality in a backwards-compatible manner, and
* PATCH version when you make backwards-compatible bug fixes.
Additional labels for pre-release and build metadata are available as extensions to the MAJOR.MINOR.PATCH format.

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### Changelog for internal API (ui-api)
### 2.0.0
* Modify how `call_info` on a transaction is conveyed. New format:
```
{
"jsonrpc": "2.0",
"id": 2,
"method": "ApproveTx",
"params": [
{
"transaction": {
"from": "0x82A2A876D39022B3019932D30Cd9c97ad5616813",
"to": "0x07a565b7ed7d7a678680a4c162885bedbb695fe0",
"gas": "0x333",
"gasPrice": "0x123",
"value": "0x10",
"nonce": "0x0",
"data": "0x4401a6e40000000000000000000000000000000000000000000000000000000000000012",
"input": null
},
"call_info": [
{
"type": "WARNING",
"message": "Invalid checksum on to-address"
},
{
"type": "WARNING",
"message": "Tx contains data, but provided ABI signature could not be matched: Did not match: test (0 matches)"
}
],
"meta": {
"remote": "127.0.0.1:54286",
"local": "localhost:8550",
"scheme": "HTTP/1.1"
}
}
]
}
```
#### 1.2.0
* Add `OnStartup` method, to provide the UI with information about what API version
the signer uses (both internal and external) aswell as build-info and external api.
Example call:
```json
{
"jsonrpc": "2.0",
"id": 1,
"method": "OnSignerStartup",
"params": [
{
"info": {
"extapi_http": "http://localhost:8550",
"extapi_ipc": null,
"extapi_version": "2.0.0",
"intapi_version": "1.2.0"
}
}
]
}
```
#### 1.1.0
* Add `OnApproved` method
#### 1.0.0
Initial release.
### Versioning
The API uses [semantic versioning](https://semver.org/).
TLDR; Given a version number MAJOR.MINOR.PATCH, increment the:
* MAJOR version when you make incompatible API changes,
* MINOR version when you add functionality in a backwards-compatible manner, and
* PATCH version when you make backwards-compatible bug fixes.
Additional labels for pre-release and build metadata are available as extensions to the MAJOR.MINOR.PATCH format.

640
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// Copyright 2018 The go-ethereum Authors
// This file is part of go-ethereum.
//
// go-ethereum is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// go-ethereum is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
// signer is a utility that can be used so sign transactions and
// arbitrary data.
package main
import (
"bufio"
"context"
"crypto/rand"
"crypto/sha256"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"os"
"os/user"
"path/filepath"
"runtime"
"strings"
"encoding/hex"
"github.com/ethereum/go-ethereum/cmd/utils"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/node"
"github.com/ethereum/go-ethereum/rpc"
"github.com/ethereum/go-ethereum/signer/core"
"github.com/ethereum/go-ethereum/signer/rules"
"github.com/ethereum/go-ethereum/signer/storage"
"gopkg.in/urfave/cli.v1"
"os/signal"
)
// ExternalApiVersion -- see extapi_changelog.md
const ExternalApiVersion = "2.0.0"
// InternalApiVersion -- see intapi_changelog.md
const InternalApiVersion = "2.0.0"
const legalWarning = `
WARNING!
Clef is alpha software, and not yet publically released. This software has _not_ been audited, and there
are no guarantees about the workings of this software. It may contain severe flaws. You should not use this software
unless you agree to take full responsibility for doing so, and know what you are doing.
TLDR; THIS IS NOT PRODUCTION-READY SOFTWARE!
`
var (
logLevelFlag = cli.IntFlag{
Name: "loglevel",
Value: 4,
Usage: "log level to emit to the screen",
}
keystoreFlag = cli.StringFlag{
Name: "keystore",
Value: filepath.Join(node.DefaultDataDir(), "keystore"),
Usage: "Directory for the keystore",
}
configdirFlag = cli.StringFlag{
Name: "configdir",
Value: DefaultConfigDir(),
Usage: "Directory for Clef configuration",
}
rpcPortFlag = cli.IntFlag{
Name: "rpcport",
Usage: "HTTP-RPC server listening port",
Value: node.DefaultHTTPPort + 5,
}
signerSecretFlag = cli.StringFlag{
Name: "signersecret",
Usage: "A file containing the password used to encrypt Clef credentials, e.g. keystore credentials and ruleset hash",
}
dBFlag = cli.StringFlag{
Name: "4bytedb",
Usage: "File containing 4byte-identifiers",
Value: "./4byte.json",
}
customDBFlag = cli.StringFlag{
Name: "4bytedb-custom",
Usage: "File used for writing new 4byte-identifiers submitted via API",
Value: "./4byte-custom.json",
}
auditLogFlag = cli.StringFlag{
Name: "auditlog",
Usage: "File used to emit audit logs. Set to \"\" to disable",
Value: "audit.log",
}
ruleFlag = cli.StringFlag{
Name: "rules",
Usage: "Enable rule-engine",
Value: "rules.json",
}
stdiouiFlag = cli.BoolFlag{
Name: "stdio-ui",
Usage: "Use STDIN/STDOUT as a channel for an external UI. " +
"This means that an STDIN/STDOUT is used for RPC-communication with a e.g. a graphical user " +
"interface, and can be used when Clef is started by an external process.",
}
testFlag = cli.BoolFlag{
Name: "stdio-ui-test",
Usage: "Mechanism to test interface between Clef and UI. Requires 'stdio-ui'.",
}
app = cli.NewApp()
initCommand = cli.Command{
Action: utils.MigrateFlags(initializeSecrets),
Name: "init",
Usage: "Initialize the signer, generate secret storage",
ArgsUsage: "",
Flags: []cli.Flag{
logLevelFlag,
configdirFlag,
},
Description: `
The init command generates a master seed which Clef can use to store credentials and data needed for
the rule-engine to work.`,
}
attestCommand = cli.Command{
Action: utils.MigrateFlags(attestFile),
Name: "attest",
Usage: "Attest that a js-file is to be used",
ArgsUsage: "<sha256sum>",
Flags: []cli.Flag{
logLevelFlag,
configdirFlag,
signerSecretFlag,
},
Description: `
The attest command stores the sha256 of the rule.js-file that you want to use for automatic processing of
incoming requests.
Whenever you make an edit to the rule file, you need to use attestation to tell
Clef that the file is 'safe' to execute.`,
}
addCredentialCommand = cli.Command{
Action: utils.MigrateFlags(addCredential),
Name: "addpw",
Usage: "Store a credential for a keystore file",
ArgsUsage: "<address> <password>",
Flags: []cli.Flag{
logLevelFlag,
configdirFlag,
signerSecretFlag,
},
Description: `
The addpw command stores a password for a given address (keyfile). If you invoke it with only one parameter, it will
remove any stored credential for that address (keyfile)
`,
}
)
func init() {
app.Name = "Clef"
app.Usage = "Manage Ethereum account operations"
app.Flags = []cli.Flag{
logLevelFlag,
keystoreFlag,
configdirFlag,
utils.NetworkIdFlag,
utils.LightKDFFlag,
utils.NoUSBFlag,
utils.RPCListenAddrFlag,
utils.RPCVirtualHostsFlag,
utils.IPCDisabledFlag,
utils.IPCPathFlag,
utils.RPCEnabledFlag,
rpcPortFlag,
signerSecretFlag,
dBFlag,
customDBFlag,
auditLogFlag,
ruleFlag,
stdiouiFlag,
testFlag,
}
app.Action = signer
app.Commands = []cli.Command{initCommand, attestCommand, addCredentialCommand}
}
func main() {
if err := app.Run(os.Args); err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
}
func initializeSecrets(c *cli.Context) error {
if err := initialize(c); err != nil {
return err
}
configDir := c.String(configdirFlag.Name)
masterSeed := make([]byte, 256)
n, err := io.ReadFull(rand.Reader, masterSeed)
if err != nil {
return err
}
if n != len(masterSeed) {
return fmt.Errorf("failed to read enough random")
}
err = os.Mkdir(configDir, 0700)
if err != nil && !os.IsExist(err) {
return err
}
location := filepath.Join(configDir, "secrets.dat")
if _, err := os.Stat(location); err == nil {
return fmt.Errorf("file %v already exists, will not overwrite", location)
}
err = ioutil.WriteFile(location, masterSeed, 0700)
if err != nil {
return err
}
fmt.Printf("A master seed has been generated into %s\n", location)
fmt.Printf(`
This is required to be able to store credentials, such as :
* Passwords for keystores (used by rule engine)
* Storage for javascript rules
* Hash of rule-file
You should treat that file with utmost secrecy, and make a backup of it.
NOTE: This file does not contain your accounts. Those need to be backed up separately!
`)
return nil
}
func attestFile(ctx *cli.Context) error {
if len(ctx.Args()) < 1 {
utils.Fatalf("This command requires an argument.")
}
if err := initialize(ctx); err != nil {
return err
}
stretchedKey, err := readMasterKey(ctx)
if err != nil {
utils.Fatalf(err.Error())
}
configDir := ctx.String(configdirFlag.Name)
vaultLocation := filepath.Join(configDir, common.Bytes2Hex(crypto.Keccak256([]byte("vault"), stretchedKey)[:10]))
confKey := crypto.Keccak256([]byte("config"), stretchedKey)
// Initialize the encrypted storages
configStorage := storage.NewAESEncryptedStorage(filepath.Join(vaultLocation, "config.json"), confKey)
val := ctx.Args().First()
configStorage.Put("ruleset_sha256", val)
log.Info("Ruleset attestation updated", "sha256", val)
return nil
}
func addCredential(ctx *cli.Context) error {
if len(ctx.Args()) < 1 {
utils.Fatalf("This command requires at leaste one argument.")
}
if err := initialize(ctx); err != nil {
return err
}
stretchedKey, err := readMasterKey(ctx)
if err != nil {
utils.Fatalf(err.Error())
}
configDir := ctx.String(configdirFlag.Name)
vaultLocation := filepath.Join(configDir, common.Bytes2Hex(crypto.Keccak256([]byte("vault"), stretchedKey)[:10]))
pwkey := crypto.Keccak256([]byte("credentials"), stretchedKey)
// Initialize the encrypted storages
pwStorage := storage.NewAESEncryptedStorage(filepath.Join(vaultLocation, "credentials.json"), pwkey)
key := ctx.Args().First()
value := ""
if len(ctx.Args()) > 1 {
value = ctx.Args().Get(1)
}
pwStorage.Put(key, value)
log.Info("Credential store updated", "key", key)
return nil
}
func initialize(c *cli.Context) error {
// Set up the logger to print everything
logOutput := os.Stdout
if c.Bool(stdiouiFlag.Name) {
logOutput = os.Stderr
// If using the stdioui, we can't do the 'confirm'-flow
fmt.Fprintf(logOutput, legalWarning)
} else {
if !confirm(legalWarning) {
return fmt.Errorf("aborted by user")
}
}
log.Root().SetHandler(log.LvlFilterHandler(log.Lvl(c.Int(logLevelFlag.Name)), log.StreamHandler(logOutput, log.TerminalFormat(true))))
return nil
}
func signer(c *cli.Context) error {
if err := initialize(c); err != nil {
return err
}
var (
ui core.SignerUI
)
if c.Bool(stdiouiFlag.Name) {
log.Info("Using stdin/stdout as UI-channel")
ui = core.NewStdIOUI()
} else {
log.Info("Using CLI as UI-channel")
ui = core.NewCommandlineUI()
}
db, err := core.NewAbiDBFromFiles(c.String(dBFlag.Name), c.String(customDBFlag.Name))
if err != nil {
utils.Fatalf(err.Error())
}
log.Info("Loaded 4byte db", "signatures", db.Size(), "file", c.String("4bytedb"))
var (
api core.ExternalAPI
)
configDir := c.String(configdirFlag.Name)
if stretchedKey, err := readMasterKey(c); err != nil {
log.Info("No master seed provided, rules disabled")
} else {
if err != nil {
utils.Fatalf(err.Error())
}
vaultLocation := filepath.Join(configDir, common.Bytes2Hex(crypto.Keccak256([]byte("vault"), stretchedKey)[:10]))
// Generate domain specific keys
pwkey := crypto.Keccak256([]byte("credentials"), stretchedKey)
jskey := crypto.Keccak256([]byte("jsstorage"), stretchedKey)
confkey := crypto.Keccak256([]byte("config"), stretchedKey)
// Initialize the encrypted storages
pwStorage := storage.NewAESEncryptedStorage(filepath.Join(vaultLocation, "credentials.json"), pwkey)
jsStorage := storage.NewAESEncryptedStorage(filepath.Join(vaultLocation, "jsstorage.json"), jskey)
configStorage := storage.NewAESEncryptedStorage(filepath.Join(vaultLocation, "config.json"), confkey)
//Do we have a rule-file?
ruleJS, err := ioutil.ReadFile(c.String(ruleFlag.Name))
if err != nil {
log.Info("Could not load rulefile, rules not enabled", "file", "rulefile")
} else {
hasher := sha256.New()
hasher.Write(ruleJS)
shasum := hasher.Sum(nil)
storedShasum := configStorage.Get("ruleset_sha256")
if storedShasum != hex.EncodeToString(shasum) {
log.Info("Could not validate ruleset hash, rules not enabled", "got", hex.EncodeToString(shasum), "expected", storedShasum)
} else {
// Initialize rules
ruleEngine, err := rules.NewRuleEvaluator(ui, jsStorage, pwStorage)
if err != nil {
utils.Fatalf(err.Error())
}
ruleEngine.Init(string(ruleJS))
ui = ruleEngine
log.Info("Rule engine configured", "file", c.String(ruleFlag.Name))
}
}
}
apiImpl := core.NewSignerAPI(
c.Int64(utils.NetworkIdFlag.Name),
c.String(keystoreFlag.Name),
c.Bool(utils.NoUSBFlag.Name),
ui, db,
c.Bool(utils.LightKDFFlag.Name))
api = apiImpl
// Audit logging
if logfile := c.String(auditLogFlag.Name); logfile != "" {
api, err = core.NewAuditLogger(logfile, api)
if err != nil {
utils.Fatalf(err.Error())
}
log.Info("Audit logs configured", "file", logfile)
}
// register signer API with server
var (
extapiUrl = "n/a"
ipcApiUrl = "n/a"
)
rpcApi := []rpc.API{
{
Namespace: "account",
Public: true,
Service: api,
Version: "1.0"},
}
if c.Bool(utils.RPCEnabledFlag.Name) {
vhosts := splitAndTrim(c.GlobalString(utils.RPCVirtualHostsFlag.Name))
cors := splitAndTrim(c.GlobalString(utils.RPCCORSDomainFlag.Name))
// start http server
httpEndpoint := fmt.Sprintf("%s:%d", c.String(utils.RPCListenAddrFlag.Name), c.Int(rpcPortFlag.Name))
listener, _, err := rpc.StartHTTPEndpoint(httpEndpoint, rpcApi, []string{"account"}, cors, vhosts)
if err != nil {
utils.Fatalf("Could not start RPC api: %v", err)
}
extapiUrl = fmt.Sprintf("http://%s", httpEndpoint)
log.Info("HTTP endpoint opened", "url", extapiUrl)
defer func() {
listener.Close()
log.Info("HTTP endpoint closed", "url", httpEndpoint)
}()
}
if !c.Bool(utils.IPCDisabledFlag.Name) {
if c.IsSet(utils.IPCPathFlag.Name) {
ipcApiUrl = c.String(utils.IPCPathFlag.Name)
} else {
ipcApiUrl = filepath.Join(configDir, "clef.ipc")
}
listener, _, err := rpc.StartIPCEndpoint(func() bool { return true }, ipcApiUrl, rpcApi)
if err != nil {
utils.Fatalf("Could not start IPC api: %v", err)
}
log.Info("IPC endpoint opened", "url", ipcApiUrl)
defer func() {
listener.Close()
log.Info("IPC endpoint closed", "url", ipcApiUrl)
}()
}
if c.Bool(testFlag.Name) {
log.Info("Performing UI test")
go testExternalUI(apiImpl)
}
ui.OnSignerStartup(core.StartupInfo{
Info: map[string]interface{}{
"extapi_version": ExternalApiVersion,
"intapi_version": InternalApiVersion,
"extapi_http": extapiUrl,
"extapi_ipc": ipcApiUrl,
},
})
abortChan := make(chan os.Signal)
signal.Notify(abortChan, os.Interrupt)
sig := <-abortChan
log.Info("Exiting...", "signal", sig)
return nil
}
// splitAndTrim splits input separated by a comma
// and trims excessive white space from the substrings.
func splitAndTrim(input string) []string {
result := strings.Split(input, ",")
for i, r := range result {
result[i] = strings.TrimSpace(r)
}
return result
}
// DefaultConfigDir is the default config directory to use for the vaults and other
// persistence requirements.
func DefaultConfigDir() string {
// Try to place the data folder in the user's home dir
home := homeDir()
if home != "" {
if runtime.GOOS == "darwin" {
return filepath.Join(home, "Library", "Signer")
} else if runtime.GOOS == "windows" {
return filepath.Join(home, "AppData", "Roaming", "Signer")
} else {
return filepath.Join(home, ".clef")
}
}
// As we cannot guess a stable location, return empty and handle later
return ""
}
func homeDir() string {
if home := os.Getenv("HOME"); home != "" {
return home
}
if usr, err := user.Current(); err == nil {
return usr.HomeDir
}
return ""
}
func readMasterKey(ctx *cli.Context) ([]byte, error) {
var (
file string
configDir = ctx.String(configdirFlag.Name)
)
if ctx.IsSet(signerSecretFlag.Name) {
file = ctx.String(signerSecretFlag.Name)
} else {
file = filepath.Join(configDir, "secrets.dat")
}
if err := checkFile(file); err != nil {
return nil, err
}
masterKey, err := ioutil.ReadFile(file)
if err != nil {
return nil, err
}
if len(masterKey) < 256 {
return nil, fmt.Errorf("master key of insufficient length, expected >255 bytes, got %d", len(masterKey))
}
// Create vault location
vaultLocation := filepath.Join(configDir, common.Bytes2Hex(crypto.Keccak256([]byte("vault"), masterKey)[:10]))
err = os.Mkdir(vaultLocation, 0700)
if err != nil && !os.IsExist(err) {
return nil, err
}
//!TODO, use KDF to stretch the master key
// stretched_key := stretch_key(master_key)
return masterKey, nil
}
// checkFile is a convenience function to check if a file
// * exists
// * is mode 0600
func checkFile(filename string) error {
info, err := os.Stat(filename)
if err != nil {
return fmt.Errorf("failed stat on %s: %v", filename, err)
}
// Check the unix permission bits
if info.Mode().Perm()&077 != 0 {
return fmt.Errorf("file (%v) has insecure file permissions (%v)", filename, info.Mode().String())
}
return nil
}
// confirm displays a text and asks for user confirmation
func confirm(text string) bool {
fmt.Printf(text)
fmt.Printf("\nEnter 'ok' to proceed:\n>")
text, err := bufio.NewReader(os.Stdin).ReadString('\n')
if err != nil {
log.Crit("Failed to read user input", "err", err)
}
if text := strings.TrimSpace(text); text == "ok" {
return true
}
return false
}
func testExternalUI(api *core.SignerAPI) {
ctx := context.WithValue(context.Background(), "remote", "clef binary")
ctx = context.WithValue(ctx, "scheme", "in-proc")
ctx = context.WithValue(ctx, "local", "main")
errs := make([]string, 0)
api.UI.ShowInfo("Testing 'ShowInfo'")
api.UI.ShowError("Testing 'ShowError'")
checkErr := func(method string, err error) {
if err != nil && err != core.ErrRequestDenied {
errs = append(errs, fmt.Sprintf("%v: %v", method, err.Error()))
}
}
var err error
_, err = api.SignTransaction(ctx, core.SendTxArgs{From: common.MixedcaseAddress{}}, nil)
checkErr("SignTransaction", err)
_, err = api.Sign(ctx, common.MixedcaseAddress{}, common.Hex2Bytes("01020304"))
checkErr("Sign", err)
_, err = api.List(ctx)
checkErr("List", err)
_, err = api.New(ctx)
checkErr("New", err)
_, err = api.Export(ctx, common.Address{})
checkErr("Export", err)
_, err = api.Import(ctx, json.RawMessage{})
checkErr("Import", err)
api.UI.ShowInfo("Tests completed")
if len(errs) > 0 {
log.Error("Got errors")
for _, e := range errs {
log.Error(e)
}
} else {
log.Info("No errors")
}
}
/**
//Create Account
curl -H "Content-Type: application/json" -X POST --data '{"jsonrpc":"2.0","method":"account_new","params":["test"],"id":67}' localhost:8550
// List accounts
curl -i -H "Content-Type: application/json" -X POST --data '{"jsonrpc":"2.0","method":"account_list","params":[""],"id":67}' http://localhost:8550/
// Make Transaction
// safeSend(0x12)
// 4401a6e40000000000000000000000000000000000000000000000000000000000000012
// supplied abi
curl -i -H "Content-Type: application/json" -X POST --data '{"jsonrpc":"2.0","method":"account_signTransaction","params":[{"from":"0x82A2A876D39022B3019932D30Cd9c97ad5616813","gas":"0x333","gasPrice":"0x123","nonce":"0x0","to":"0x07a565b7ed7d7a678680a4c162885bedbb695fe0", "value":"0x10", "data":"0x4401a6e40000000000000000000000000000000000000000000000000000000000000012"},"test"],"id":67}' http://localhost:8550/
// Not supplied
curl -i -H "Content-Type: application/json" -X POST --data '{"jsonrpc":"2.0","method":"account_signTransaction","params":[{"from":"0x82A2A876D39022B3019932D30Cd9c97ad5616813","gas":"0x333","gasPrice":"0x123","nonce":"0x0","to":"0x07a565b7ed7d7a678680a4c162885bedbb695fe0", "value":"0x10", "data":"0x4401a6e40000000000000000000000000000000000000000000000000000000000000012"}],"id":67}' http://localhost:8550/
// Sign data
curl -i -H "Content-Type: application/json" -X POST --data '{"jsonrpc":"2.0","method":"account_sign","params":["0x694267f14675d7e1b9494fd8d72fefe1755710fa","bazonk gaz baz"],"id":67}' http://localhost:8550/
**/

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import os,sys, subprocess
from tinyrpc.transports import ServerTransport
from tinyrpc.protocols.jsonrpc import JSONRPCProtocol
from tinyrpc.dispatch import public,RPCDispatcher
from tinyrpc.server import RPCServer
""" This is a POC example of how to write a custom UI for Clef. The UI starts the
clef process with the '--stdio-ui' option, and communicates with clef using standard input / output.
The standard input/output is a relatively secure way to communicate, as it does not require opening any ports
or IPC files. Needless to say, it does not protect against memory inspection mechanisms where an attacker
can access process memory."""
try:
import urllib.parse as urlparse
except ImportError:
import urllib as urlparse
class StdIOTransport(ServerTransport):
""" Uses std input/output for RPC """
def receive_message(self):
return None, urlparse.unquote(sys.stdin.readline())
def send_reply(self, context, reply):
print(reply)
class PipeTransport(ServerTransport):
""" Uses std a pipe for RPC """
def __init__(self,input, output):
self.input = input
self.output = output
def receive_message(self):
data = self.input.readline()
print(">> {}".format( data))
return None, urlparse.unquote(data)
def send_reply(self, context, reply):
print("<< {}".format( reply))
self.output.write(reply)
self.output.write("\n")
class StdIOHandler():
def __init__(self):
pass
@public
def ApproveTx(self,req):
"""
Example request:
{
"jsonrpc": "2.0",
"method": "ApproveTx",
"params": [{
"transaction": {
"to": "0xae967917c465db8578ca9024c205720b1a3651A9",
"gas": "0x333",
"gasPrice": "0x123",
"value": "0x10",
"data": "0xd7a5865800000000000000000000000000000000000000000000000000000000000000ff",
"nonce": "0x0"
},
"from": "0xAe967917c465db8578ca9024c205720b1a3651A9",
"call_info": "Warning! Could not validate ABI-data against calldata\nSupplied ABI spec does not contain method signature in data: 0xd7a58658",
"meta": {
"remote": "127.0.0.1:34572",
"local": "localhost:8550",
"scheme": "HTTP/1.1"
}
}],
"id": 1
}
:param transaction: transaction info
:param call_info: info abou the call, e.g. if ABI info could not be
:param meta: metadata about the request, e.g. where the call comes from
:return:
"""
transaction = req.get('transaction')
_from = req.get('from')
call_info = req.get('call_info')
meta = req.get('meta')
return {
"approved" : False,
#"transaction" : transaction,
# "from" : _from,
# "password" : None,
}
@public
def ApproveSignData(self, req):
""" Example request
"""
return {"approved": False, "password" : None}
@public
def ApproveExport(self, req):
""" Example request
"""
return {"approved" : False}
@public
def ApproveImport(self, req):
""" Example request
"""
return { "approved" : False, "old_password": "", "new_password": ""}
@public
def ApproveListing(self, req):
""" Example request
"""
return {'accounts': []}
@public
def ApproveNewAccount(self, req):
"""
Example request
:return:
"""
return {"approved": False,
#"password": ""
}
@public
def ShowError(self,message = {}):
"""
Example request:
{"jsonrpc":"2.0","method":"ShowInfo","params":{"message":"Testing 'ShowError'"},"id":1}
:param message: to show
:return: nothing
"""
if 'text' in message.keys():
sys.stderr.write("Error: {}\n".format( message['text']))
return
@public
def ShowInfo(self,message = {}):
"""
Example request
{"jsonrpc":"2.0","method":"ShowInfo","params":{"message":"Testing 'ShowInfo'"},"id":0}
:param message: to display
:return:nothing
"""
if 'text' in message.keys():
sys.stdout.write("Error: {}\n".format( message['text']))
return
def main(args):
cmd = ["./clef", "--stdio-ui"]
if len(args) > 0 and args[0] == "test":
cmd.extend(["--stdio-ui-test"])
print("cmd: {}".format(" ".join(cmd)))
dispatcher = RPCDispatcher()
dispatcher.register_instance(StdIOHandler(), '')
# line buffered
p = subprocess.Popen(cmd, bufsize=1, universal_newlines=True, stdin=subprocess.PIPE, stdout=subprocess.PIPE)
rpc_server = RPCServer(
PipeTransport(p.stdout, p.stdin),
JSONRPCProtocol(),
dispatcher
)
rpc_server.serve_forever()
if __name__ == '__main__':
main(sys.argv[1:])

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# Rules
The `signer` binary contains a ruleset engine, implemented with [OttoVM](https://github.com/robertkrimen/otto)
It enables usecases like the following:
* I want to auto-approve transactions with contract `CasinoDapp`, with up to `0.05 ether` in value to maximum `1 ether` per 24h period
* I want to auto-approve transaction to contract `EthAlarmClock` with `data`=`0xdeadbeef`, if `value=0`, `gas < 44k` and `gasPrice < 40Gwei`
The two main features that are required for this to work well are;
1. Rule Implementation: how to create, manage and interpret rules in a flexible but secure manner
2. Credential managements and credentials; how to provide auto-unlock without exposing keys unnecessarily.
The section below deals with both of them
## Rule Implementation
A ruleset file is implemented as a `js` file. Under the hood, the ruleset-engine is a `SignerUI`, implementing the same methods as the `json-rpc` methods
defined in the UI protocol. Example:
```javascript
function asBig(str){
if(str.slice(0,2) == "0x"){ return new BigNumber(str.slice(2),16)}
return new BigNumber(str)
}
// Approve transactions to a certain contract if value is below a certain limit
function ApproveTx(req){
var limit = big.Newint("0xb1a2bc2ec50000")
var value = asBig(req.transaction.value);
if(req.transaction.to.toLowerCase()=="0xae967917c465db8578ca9024c205720b1a3651a9")
&& value.lt(limit) ){
return "Approve"
}
// If we return "Reject", it will be rejected.
// By not returning anything, it will be passed to the next UI, for manual processing
}
//Approve listings if request made from IPC
function ApproveListing(req){
if (req.metadata.scheme == "ipc"){ return "Approve"}
}
```
Whenever the external API is called (and the ruleset is enabled), the `signer` calls the UI, which is an instance of a ruleset-engine. The ruleset-engine
invokes the corresponding method. In doing so, there are three possible outcomes:
1. JS returns "Approve"
* Auto-approve request
2. JS returns "Reject"
* Auto-reject request
3. Error occurs, or something else is returned
* Pass on to `next` ui: the regular UI channel.
A more advanced example can be found below, "Example 1: ruleset for a rate-limited window", using `storage` to `Put` and `Get` `string`s by key.
* At the time of writing, storage only exists as an ephemeral unencrypted implementation, to be used during testing.
### Things to note
The Otto vm has a few [caveats](https://github.com/robertkrimen/otto):
* "use strict" will parse, but does nothing.
* The regular expression engine (re2/regexp) is not fully compatible with the ECMA5 specification.
* Otto targets ES5. ES6 features (eg: Typed Arrays) are not supported.
Additionally, a few more have been added
* The rule execution cannot load external javascript files.
* The only preloaded libary is [`bignumber.js`](https://github.com/MikeMcl/bignumber.js) version `2.0.3`. This one is fairly old, and is not aligned with the documentation at the github repository.
* Each invocation is made in a fresh virtual machine. This means that you cannot store data in global variables between invocations. This is a deliberate choice -- if you want to store data, use the disk-backed `storage`, since rules should not rely on ephemeral data.
* Javascript API parameters are _always_ an object. This is also a design choice, to ensure that parameters are accessed by _key_ and not by order. This is to prevent mistakes due to missing parameters or parameter changes.
* The JS engine has access to `storage` and `console`.
#### Security considerations
##### Security of ruleset
Some security precautions can be made, such as:
* Never load `ruleset.js` unless the file is `readonly` (`r-??-??-?`). If the user wishes to modify the ruleset, he must make it writeable and then set back to readonly.
* This is to prevent attacks where files are dropped on the users disk.
* Since we're going to have to have some form of secure storage (not defined in this section), we could also store the `sha3` of the `ruleset.js` file in there.
* If the user wishes to modify the ruleset, he'd then have to perform e.g. `signer --attest /path/to/ruleset --credential <creds>`
##### Security of implementation
The drawbacks of this very flexible solution is that the `signer` needs to contain a javascript engine. This is pretty simple to implement, since it's already
implemented for `geth`. There are no known security vulnerabilities in, nor have we had any security-problems with it so far.
The javascript engine would be an added attack surface; but if the validation of `rulesets` is made good (with hash-based attestation), the actual javascript cannot be considered
an attack surface -- if an attacker can control the ruleset, a much simpler attack would be to implement an "always-approve" rule instead of exploiting the js vm. The only benefit
to be gained from attacking the actual `signer` process from the `js` side would be if it could somehow extract cryptographic keys from memory.
##### Security in usability
Javascript is flexible, but also easy to get wrong, especially when users assume that `js` can handle large integers natively. Typical errors
include trying to multiply `gasCost` with `gas` without using `bigint`:s.
It's unclear whether any other DSL could be more secure; since there's always the possibility of erroneously implementing a rule.
## Credential management
The ability to auto-approve transaction means that the signer needs to have necessary credentials to decrypt keyfiles. These passwords are hereafter called `ksp` (keystore pass).
### Example implementation
Upon startup of the signer, the signer is given a switch: `--seed <path/to/masterseed>`
The `seed` contains a blob of bytes, which is the master seed for the `signer`.
The `signer` uses the `seed` to:
* Generate the `path` where the settings are stored.
* `./settings/1df094eb-c2b1-4689-90dd-790046d38025/vault.dat`
* `./settings/1df094eb-c2b1-4689-90dd-790046d38025/rules.js`
* Generate the encryption password for `vault.dat`.
The `vault.dat` would be an encrypted container storing the following information:
* `ksp` entries
* `sha256` hash of `rules.js`
* Information about pair:ed callers (not yet specified)
### Security considerations
This would leave it up to the user to ensure that the `path/to/masterseed` is handled in a secure way. It's difficult to get around this, although one could
imagine leveraging OS-level keychains where supported. The setup is however in general similar to how ssh-keys are stored in `.ssh/`.
# Implementation status
This is now implemented (with ephemeral non-encrypted storage for now, so not yet enabled).
## Example 1: ruleset for a rate-limited window
```javascript
function big(str){
if(str.slice(0,2) == "0x"){ return new BigNumber(str.slice(2),16)}
return new BigNumber(str)
}
// Time window: 1 week
var window = 1000* 3600*24*7;
// Limit : 1 ether
var limit = new BigNumber("1e18");
function isLimitOk(transaction){
var value = big(transaction.value)
// Start of our window function
var windowstart = new Date().getTime() - window;
var txs = [];
var stored = storage.Get('txs');
if(stored != ""){
txs = JSON.parse(stored)
}
// First, remove all that have passed out of the time-window
var newtxs = txs.filter(function(tx){return tx.tstamp > windowstart});
console.log(txs, newtxs.length);
// Secondly, aggregate the current sum
sum = new BigNumber(0)
sum = newtxs.reduce(function(agg, tx){ return big(tx.value).plus(agg)}, sum);
console.log("ApproveTx > Sum so far", sum);
console.log("ApproveTx > Requested", value.toNumber());
// Would we exceed weekly limit ?
return sum.plus(value).lt(limit)
}
function ApproveTx(r){
if (isLimitOk(r.transaction)){
return "Approve"
}
return "Nope"
}
/**
* OnApprovedTx(str) is called when a transaction has been approved and signed. The parameter
* 'response_str' contains the return value that will be sent to the external caller.
* The return value from this method is ignore - the reason for having this callback is to allow the
* ruleset to keep track of approved transactions.
*
* When implementing rate-limited rules, this callback should be used.
* If a rule responds with neither 'Approve' nor 'Reject' - the tx goes to manual processing. If the user
* then accepts the transaction, this method will be called.
*
* TLDR; Use this method to keep track of signed transactions, instead of using the data in ApproveTx.
*/
function OnApprovedTx(resp){
var value = big(resp.tx.value)
var txs = []
// Load stored transactions
var stored = storage.Get('txs');
if(stored != ""){
txs = JSON.parse(stored)
}
// Add this to the storage
txs.push({tstamp: new Date().getTime(), value: value});
storage.Put("txs", JSON.stringify(txs));
}
```
## Example 2: allow destination
```javascript
function ApproveTx(r){
if(r.transaction.from.toLowerCase()=="0x0000000000000000000000000000000000001337"){ return "Approve"}
if(r.transaction.from.toLowerCase()=="0x000000000000000000000000000000000000dead"){ return "Reject"}
// Otherwise goes to manual processing
}
```
## Example 3: Allow listing
```javascript
function ApproveListing(){
return "Approve"
}
```

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## Initializing the signer
First, initialize the master seed.
```text
#./signer init
WARNING!
The signer is alpha software, and not yet publically released. This software has _not_ been audited, and there
are no guarantees about the workings of this software. It may contain severe flaws. You should not use this software
unless you agree to take full responsibility for doing so, and know what you are doing.
TLDR; THIS IS NOT PRODUCTION-READY SOFTWARE!
Enter 'ok' to proceed:
>ok
A master seed has been generated into /home/martin/.signer/secrets.dat
This is required to be able to store credentials, such as :
* Passwords for keystores (used by rule engine)
* Storage for javascript rules
* Hash of rule-file
You should treat that file with utmost secrecy, and make a backup of it.
NOTE: This file does not contain your accounts. Those need to be backed up separately!
```
(for readability purposes, we'll remove the WARNING printout in the rest of this document)
## Creating rules
Now, you can create a rule-file.
```javascript
function ApproveListing(){
return "Approve"
}
```
Get the `sha256` hash....
```text
#sha256sum rules.js
6c21d1737429d6d4f2e55146da0797782f3c0a0355227f19d702df377c165d72 rules.js
```
...And then `attest` the file:
```text
#./signer attest 6c21d1737429d6d4f2e55146da0797782f3c0a0355227f19d702df377c165d72
INFO [02-21|12:14:38] Ruleset attestation updated sha256=6c21d1737429d6d4f2e55146da0797782f3c0a0355227f19d702df377c165d72
```
At this point, we then start the signer with the rule-file:
```text
#./signer --rules rules.json
INFO [02-21|12:15:18] Using CLI as UI-channel
INFO [02-21|12:15:18] Loaded 4byte db signatures=5509 file=./4byte.json
INFO [02-21|12:15:18] Could not load rulefile, rules not enabled file=rulefile
DEBUG[02-21|12:15:18] FS scan times list=35.335µs set=5.536µs diff=5.073µs
DEBUG[02-21|12:15:18] Ledger support enabled
DEBUG[02-21|12:15:18] Trezor support enabled
INFO [02-21|12:15:18] Audit logs configured file=audit.log
INFO [02-21|12:15:18] HTTP endpoint opened url=http://localhost:8550
------- Signer info -------
* extapi_http : http://localhost:8550
* extapi_ipc : <nil>
* extapi_version : 2.0.0
* intapi_version : 1.2.0
```
Any list-requests will now be auto-approved by our rule-file.
## Under the hood
While doing the operations above, these files have been created:
```text
#ls -laR ~/.signer/
/home/martin/.signer/:
total 16
drwx------ 3 martin martin 4096 feb 21 12:14 .
drwxr-xr-x 71 martin martin 4096 feb 21 12:12 ..
drwx------ 2 martin martin 4096 feb 21 12:14 43f73718397aa54d1b22
-rwx------ 1 martin martin 256 feb 21 12:12 secrets.dat
/home/martin/.signer/43f73718397aa54d1b22:
total 12
drwx------ 2 martin martin 4096 feb 21 12:14 .
drwx------ 3 martin martin 4096 feb 21 12:14 ..
-rw------- 1 martin martin 159 feb 21 12:14 config.json
#cat /home/martin/.signer/43f73718397aa54d1b22/config.json
{"ruleset_sha256":{"iv":"6v4W4tfJxj3zZFbl","c":"6dt5RTDiTq93yh1qDEjpsat/tsKG7cb+vr3sza26IPL2fvsQ6ZoqFx++CPUa8yy6fD9Bbq41L01ehkKHTG3pOAeqTW6zc/+t0wv3AB6xPmU="}}
```
In `~/.signer`, the `secrets.dat` file was created, containing the `master_seed`.
The `master_seed` was then used to derive a few other things:
- `vault_location` : in this case `43f73718397aa54d1b22` .
- Thus, if you use a different `master_seed`, another `vault_location` will be used that does not conflict with each other.
- Example: `signer --signersecret /path/to/afile ...`
- `config.json` which is the encrypted key/value storage for configuration data, containing the key `ruleset_sha256`.
## Adding credentials
In order to make more useful rules; sign transactions, the signer needs access to the passwords needed to unlock keystores.
```text
#./signer addpw 0x694267f14675d7e1b9494fd8d72fefe1755710fa test
INFO [02-21|13:43:21] Credential store updated key=0x694267f14675d7e1b9494fd8d72fefe1755710fa
```
## More advanced rules
Now let's update the rules to make use of credentials
```javascript
function ApproveListing(){
return "Approve"
}
function ApproveSignData(r){
if( r.address.toLowerCase() == "0x694267f14675d7e1b9494fd8d72fefe1755710fa")
{
if(r.message.indexOf("bazonk") >= 0){
return "Approve"
}
return "Reject"
}
// Otherwise goes to manual processing
}
```
In this example,
* any requests to sign data with the account `0x694...` will be
* auto-approved if the message contains with `bazonk`,
* and auto-rejected if it does not.
* Any other signing-requests will be passed along for manual approve/reject.
..attest the new file
```text
#sha256sum rules.js
2a0cb661dacfc804b6e95d935d813fd17c0997a7170e4092ffbc34ca976acd9f rules.js
#./signer attest 2a0cb661dacfc804b6e95d935d813fd17c0997a7170e4092ffbc34ca976acd9f
INFO [02-21|14:36:30] Ruleset attestation updated sha256=2a0cb661dacfc804b6e95d935d813fd17c0997a7170e4092ffbc34ca976acd9f
```
And start the signer:
```
#./signer --rules rules.js
INFO [02-21|14:41:56] Using CLI as UI-channel
INFO [02-21|14:41:56] Loaded 4byte db signatures=5509 file=./4byte.json
INFO [02-21|14:41:56] Rule engine configured file=rules.js
DEBUG[02-21|14:41:56] FS scan times list=34.607µs set=4.509µs diff=4.87µs
DEBUG[02-21|14:41:56] Ledger support enabled
DEBUG[02-21|14:41:56] Trezor support enabled
INFO [02-21|14:41:56] Audit logs configured file=audit.log
INFO [02-21|14:41:56] HTTP endpoint opened url=http://localhost:8550
------- Signer info -------
* extapi_version : 2.0.0
* intapi_version : 1.2.0
* extapi_http : http://localhost:8550
* extapi_ipc : <nil>
INFO [02-21|14:41:56] error occurred during execution error="ReferenceError: 'OnSignerStartup' is not defined"
```
And then test signing, once with `bazonk` and once without:
```
#curl -H "Content-Type: application/json" -X POST --data "{\"jsonrpc\":\"2.0\",\"method\":\"account_sign\",\"params\":[\"0x694267f14675d7e1b9494fd8d72fefe1755710fa\",\"0x$(xxd -pu <<< ' bazonk baz gaz')\"],\"id\":67}" http://localhost:8550/
{"jsonrpc":"2.0","id":67,"result":"0x93e6161840c3ae1efc26dc68dedab6e8fc233bb3fefa1b4645dbf6609b93dace160572ea4ab33240256bb6d3dadb60dcd9c515d6374d3cf614ee897408d41d541c"}
#curl -H "Content-Type: application/json" -X POST --data "{\"jsonrpc\":\"2.0\",\"method\":\"account_sign\",\"params\":[\"0x694267f14675d7e1b9494fd8d72fefe1755710fa\",\"0x$(xxd -pu <<< ' bonk baz gaz')\"],\"id\":67}" http://localhost:8550/
{"jsonrpc":"2.0","id":67,"error":{"code":-32000,"message":"Request denied"}}
```
Meanwhile, in the signer output:
```text
INFO [02-21|14:42:41] Op approved
INFO [02-21|14:42:56] Op rejected
```
The signer also stores all traffic over the external API in a log file. The last 4 lines shows the two requests and their responses:
```text
#tail audit.log -n 4
t=2018-02-21T14:42:41+0100 lvl=info msg=Sign api=signer type=request metadata="{\"remote\":\"127.0.0.1:49706\",\"local\":\"localhost:8550\",\"scheme\":\"HTTP/1.1\"}" addr="0x694267f14675d7e1b9494fd8d72fefe1755710fa [chksum INVALID]" data=202062617a6f6e6b2062617a2067617a0a
t=2018-02-21T14:42:42+0100 lvl=info msg=Sign api=signer type=response data=93e6161840c3ae1efc26dc68dedab6e8fc233bb3fefa1b4645dbf6609b93dace160572ea4ab33240256bb6d3dadb60dcd9c515d6374d3cf614ee897408d41d541c error=nil
t=2018-02-21T14:42:56+0100 lvl=info msg=Sign api=signer type=request metadata="{\"remote\":\"127.0.0.1:49708\",\"local\":\"localhost:8550\",\"scheme\":\"HTTP/1.1\"}" addr="0x694267f14675d7e1b9494fd8d72fefe1755710fa [chksum INVALID]" data=2020626f6e6b2062617a2067617a0a
t=2018-02-21T14:42:56+0100 lvl=info msg=Sign api=signer type=response data= error="Request denied"
```

62
common/types.go
View File

@ -23,8 +23,10 @@ import (
"math/rand" "math/rand"
"reflect" "reflect"
"encoding/json"
"github.com/ethereum/go-ethereum/common/hexutil" "github.com/ethereum/go-ethereum/common/hexutil"
"github.com/ethereum/go-ethereum/crypto/sha3" "github.com/ethereum/go-ethereum/crypto/sha3"
"strings"
) )
const ( const (
@ -238,3 +240,63 @@ func (a *UnprefixedAddress) UnmarshalText(input []byte) error {
func (a UnprefixedAddress) MarshalText() ([]byte, error) { func (a UnprefixedAddress) MarshalText() ([]byte, error) {
return []byte(hex.EncodeToString(a[:])), nil return []byte(hex.EncodeToString(a[:])), nil
} }
// MixedcaseAddress retains the original string, which may or may not be
// correctly checksummed
type MixedcaseAddress struct {
addr Address
original string
}
// NewMixedcaseAddress constructor (mainly for testing)
func NewMixedcaseAddress(addr Address) MixedcaseAddress {
return MixedcaseAddress{addr: addr, original: addr.Hex()}
}
// NewMixedcaseAddressFromString is mainly meant for unit-testing
func NewMixedcaseAddressFromString(hexaddr string) (*MixedcaseAddress, error) {
if !IsHexAddress(hexaddr) {
return nil, fmt.Errorf("Invalid address")
}
a := FromHex(hexaddr)
return &MixedcaseAddress{addr: BytesToAddress(a), original: hexaddr}, nil
}
// UnmarshalJSON parses MixedcaseAddress
func (ma *MixedcaseAddress) UnmarshalJSON(input []byte) error {
if err := hexutil.UnmarshalFixedJSON(addressT, input, ma.addr[:]); err != nil {
return err
}
return json.Unmarshal(input, &ma.original)
}
// MarshalJSON marshals the original value
func (ma *MixedcaseAddress) MarshalJSON() ([]byte, error) {
if strings.HasPrefix(ma.original, "0x") || strings.HasPrefix(ma.original, "0X") {
return json.Marshal(fmt.Sprintf("0x%s", ma.original[2:]))
}
return json.Marshal(fmt.Sprintf("0x%s", ma.original))
}
// Address returns the address
func (ma *MixedcaseAddress) Address() Address {
return ma.addr
}
// String implements fmt.Stringer
func (ma *MixedcaseAddress) String() string {
if ma.ValidChecksum() {
return fmt.Sprintf("%s [chksum ok]", ma.original)
}
return fmt.Sprintf("%s [chksum INVALID]", ma.original)
}
// ValidChecksum returns true if the address has valid checksum
func (ma *MixedcaseAddress) ValidChecksum() bool {
return ma.original == ma.addr.Hex()
}
// Original returns the mixed-case input string
func (ma *MixedcaseAddress) Original() string {
return ma.original
}

44
common/types_test.go
View File

@ -18,6 +18,7 @@ package common
import ( import (
"encoding/json" "encoding/json"
"math/big" "math/big"
"strings" "strings"
"testing" "testing"
@ -149,3 +150,46 @@ func BenchmarkAddressHex(b *testing.B) {
testAddr.Hex() testAddr.Hex()
} }
} }
func TestMixedcaseAccount_Address(t *testing.T) {
// https://github.com/ethereum/EIPs/blob/master/EIPS/eip-55.md
// Note: 0X{checksum_addr} is not valid according to spec above
var res []struct {
A MixedcaseAddress
Valid bool
}
if err := json.Unmarshal([]byte(`[
{"A" : "0xae967917c465db8578ca9024c205720b1a3651A9", "Valid": false},
{"A" : "0xAe967917c465db8578ca9024c205720b1a3651A9", "Valid": true},
{"A" : "0XAe967917c465db8578ca9024c205720b1a3651A9", "Valid": false},
{"A" : "0x1111111111111111111112222222222223333323", "Valid": true}
]`), &res); err != nil {
t.Fatal(err)
}
for _, r := range res {
if got := r.A.ValidChecksum(); got != r.Valid {
t.Errorf("Expected checksum %v, got checksum %v, input %v", r.Valid, got, r.A.String())
}
}
//These should throw exceptions:
var r2 []MixedcaseAddress
for _, r := range []string{
`["0x11111111111111111111122222222222233333"]`, // Too short
`["0x111111111111111111111222222222222333332"]`, // Too short
`["0x11111111111111111111122222222222233333234"]`, // Too long
`["0x111111111111111111111222222222222333332344"]`, // Too long
`["1111111111111111111112222222222223333323"]`, // Missing 0x
`["x1111111111111111111112222222222223333323"]`, // Missing 0
`["0xG111111111111111111112222222222223333323"]`, //Non-hex
} {
if err := json.Unmarshal([]byte(r), &r2); err == nil {
t.Errorf("Expected failure, input %v", r)
}
}
}

91
node/node.go
View File

@ -306,47 +306,23 @@ func (n *Node) startIPC(apis []rpc.API) error {
// Short circuit if the IPC endpoint isn't being exposed // Short circuit if the IPC endpoint isn't being exposed
if n.ipcEndpoint == "" { if n.ipcEndpoint == "" {
return nil return nil
} }
// Register all the APIs exposed by the services isClosed := func() bool {
handler := rpc.NewServer() n.lock.RLock()
for _, api := range apis { defer n.lock.RUnlock()
if err := handler.RegisterName(api.Namespace, api.Service); err != nil { return n.ipcListener == nil
return err
}
n.log.Debug("IPC registered", "service", api.Service, "namespace", api.Namespace)
} }
// All APIs registered, start the IPC listener
var ( listener, handler, err := rpc.StartIPCEndpoint(isClosed, n.ipcEndpoint, apis)
listener net.Listener if err != nil {
err error
)
if listener, err = rpc.CreateIPCListener(n.ipcEndpoint); err != nil {
return err return err
} }
go func() {
n.log.Info("IPC endpoint opened", "url", n.ipcEndpoint)
for {
conn, err := listener.Accept()
if err != nil {
// Terminate if the listener was closed
n.lock.RLock()
closed := n.ipcListener == nil
n.lock.RUnlock()
if closed {
return
}
// Not closed, just some error; report and continue
n.log.Error("IPC accept failed", "err", err)
continue
}
go handler.ServeCodec(rpc.NewJSONCodec(conn), rpc.OptionMethodInvocation|rpc.OptionSubscriptions)
}
}()
// All listeners booted successfully // All listeners booted successfully
n.ipcListener = listener n.ipcListener = listener
n.ipcHandler = handler n.ipcHandler = handler
n.log.Info("IPC endpoint opened", "url", n.ipcEndpoint)
return nil return nil
} }
@ -370,30 +346,10 @@ func (n *Node) startHTTP(endpoint string, apis []rpc.API, modules []string, cors
if endpoint == "" { if endpoint == "" {
return nil return nil
} }
// Generate the whitelist based on the allowed modules listener, handler, err := rpc.StartHTTPEndpoint(endpoint, apis, modules, cors, vhosts)
whitelist := make(map[string]bool) if err != nil {
for _, module := range modules {
whitelist[module] = true
}
// Register all the APIs exposed by the services
handler := rpc.NewServer()
for _, api := range apis {
if whitelist[api.Namespace] || (len(whitelist) == 0 && api.Public) {
if err := handler.RegisterName(api.Namespace, api.Service); err != nil {
return err
}
n.log.Debug("HTTP registered", "service", api.Service, "namespace", api.Namespace)
}
}
// All APIs registered, start the HTTP listener
var (
listener net.Listener
err error
)
if listener, err = net.Listen("tcp", endpoint); err != nil {
return err return err
} }
go rpc.NewHTTPServer(cors, vhosts, handler).Serve(listener)
n.log.Info("HTTP endpoint opened", "url", fmt.Sprintf("http://%s", endpoint), "cors", strings.Join(cors, ","), "vhosts", strings.Join(vhosts, ",")) n.log.Info("HTTP endpoint opened", "url", fmt.Sprintf("http://%s", endpoint), "cors", strings.Join(cors, ","), "vhosts", strings.Join(vhosts, ","))
// All listeners booted successfully // All listeners booted successfully
n.httpEndpoint = endpoint n.httpEndpoint = endpoint
@ -423,32 +379,11 @@ func (n *Node) startWS(endpoint string, apis []rpc.API, modules []string, wsOrig
if endpoint == "" { if endpoint == "" {
return nil return nil
} }
// Generate the whitelist based on the allowed modules listener, handler, err := rpc.StartWSEndpoint(endpoint, apis, modules, wsOrigins, exposeAll)
whitelist := make(map[string]bool) if err != nil {
for _, module := range modules {
whitelist[module] = true
}
// Register all the APIs exposed by the services
handler := rpc.NewServer()
for _, api := range apis {
if exposeAll || whitelist[api.Namespace] || (len(whitelist) == 0 && api.Public) {
if err := handler.RegisterName(api.Namespace, api.Service); err != nil {
return err
}
n.log.Debug("WebSocket registered", "service", api.Service, "namespace", api.Namespace)
}
}
// All APIs registered, start the HTTP listener
var (
listener net.Listener
err error
)
if listener, err = net.Listen("tcp", endpoint); err != nil {
return err return err
} }
go rpc.NewWSServer(wsOrigins, handler).Serve(listener)
n.log.Info("WebSocket endpoint opened", "url", fmt.Sprintf("ws://%s", listener.Addr())) n.log.Info("WebSocket endpoint opened", "url", fmt.Sprintf("ws://%s", listener.Addr()))
// All listeners booted successfully // All listeners booted successfully
n.wsEndpoint = endpoint n.wsEndpoint = endpoint
n.wsListener = listener n.wsListener = listener

53
rpc/client.go
View File

@ -33,6 +33,7 @@ import (
"time" "time"
"github.com/ethereum/go-ethereum/log" "github.com/ethereum/go-ethereum/log"
"os"
) )
var ( var (
@ -171,6 +172,8 @@ func DialContext(ctx context.Context, rawurl string) (*Client, error) {
return DialHTTP(rawurl) return DialHTTP(rawurl)
case "ws", "wss": case "ws", "wss":
return DialWebsocket(ctx, rawurl, "") return DialWebsocket(ctx, rawurl, "")
case "stdio":
return DialStdIO(ctx)
case "": case "":
return DialIPC(ctx, rawurl) return DialIPC(ctx, rawurl)
default: default:
@ -178,13 +181,51 @@ func DialContext(ctx context.Context, rawurl string) (*Client, error) {
} }
} }
type StdIOConn struct{}
func (io StdIOConn) Read(b []byte) (n int, err error) {
return os.Stdin.Read(b)
}
func (io StdIOConn) Write(b []byte) (n int, err error) {
return os.Stdout.Write(b)
}
func (io StdIOConn) Close() error {
return nil
}
func (io StdIOConn) LocalAddr() net.Addr {
return &net.UnixAddr{Name: "stdio", Net: "stdio"}
}
func (io StdIOConn) RemoteAddr() net.Addr {
return &net.UnixAddr{Name: "stdio", Net: "stdio"}
}
func (io StdIOConn) SetDeadline(t time.Time) error {
return &net.OpError{Op: "set", Net: "stdio", Source: nil, Addr: nil, Err: errors.New("deadline not supported")}
}
func (io StdIOConn) SetReadDeadline(t time.Time) error {
return &net.OpError{Op: "set", Net: "stdio", Source: nil, Addr: nil, Err: errors.New("deadline not supported")}
}
func (io StdIOConn) SetWriteDeadline(t time.Time) error {
return &net.OpError{Op: "set", Net: "stdio", Source: nil, Addr: nil, Err: errors.New("deadline not supported")}
}
func DialStdIO(ctx context.Context) (*Client, error) {
return newClient(ctx, func(_ context.Context) (net.Conn, error) {
return StdIOConn{}, nil
})
}
func newClient(initctx context.Context, connectFunc func(context.Context) (net.Conn, error)) (*Client, error) { func newClient(initctx context.Context, connectFunc func(context.Context) (net.Conn, error)) (*Client, error) {
conn, err := connectFunc(initctx) conn, err := connectFunc(initctx)
if err != nil { if err != nil {
return nil, err return nil, err
} }
_, isHTTP := conn.(*httpConn) _, isHTTP := conn.(*httpConn)
c := &Client{ c := &Client{
writeConn: conn, writeConn: conn,
isHTTP: isHTTP, isHTTP: isHTTP,
@ -524,13 +565,13 @@ func (c *Client) dispatch(conn net.Conn) {
} }
case err := <-c.readErr: case err := <-c.readErr:
log.Debug(fmt.Sprintf("<-readErr: %v", err)) log.Debug("<-readErr", "err", err)
c.closeRequestOps(err) c.closeRequestOps(err)
conn.Close() conn.Close()
reading = false reading = false
case newconn := <-c.reconnected: case newconn := <-c.reconnected:
log.Debug(fmt.Sprintf("<-reconnected: (reading=%t) %v", reading, conn.RemoteAddr())) log.Debug("<-reconnected", "reading", reading, "remote", conn.RemoteAddr())
if reading { if reading {
// Wait for the previous read loop to exit. This is a rare case. // Wait for the previous read loop to exit. This is a rare case.
conn.Close() conn.Close()
@ -587,7 +628,7 @@ func (c *Client) closeRequestOps(err error) {
func (c *Client) handleNotification(msg *jsonrpcMessage) { func (c *Client) handleNotification(msg *jsonrpcMessage) {
if !strings.HasSuffix(msg.Method, notificationMethodSuffix) { if !strings.HasSuffix(msg.Method, notificationMethodSuffix) {
log.Debug(fmt.Sprint("dropping non-subscription message: ", msg)) log.Debug("dropping non-subscription message", "msg", msg)
return return
} }
var subResult struct { var subResult struct {
@ -595,7 +636,7 @@ func (c *Client) handleNotification(msg *jsonrpcMessage) {
Result json.RawMessage `json:"result"` Result json.RawMessage `json:"result"`
} }
if err := json.Unmarshal(msg.Params, &subResult); err != nil { if err := json.Unmarshal(msg.Params, &subResult); err != nil {
log.Debug(fmt.Sprint("dropping invalid subscription message: ", msg)) log.Debug("dropping invalid subscription message", "msg", msg)
return return
} }
if c.subs[subResult.ID] != nil { if c.subs[subResult.ID] != nil {
@ -606,7 +647,7 @@ func (c *Client) handleNotification(msg *jsonrpcMessage) {
func (c *Client) handleResponse(msg *jsonrpcMessage) { func (c *Client) handleResponse(msg *jsonrpcMessage) {
op := c.respWait[string(msg.ID)] op := c.respWait[string(msg.ID)]
if op == nil { if op == nil {
log.Debug(fmt.Sprintf("unsolicited response %v", msg)) log.Debug("unsolicited response", "msg", msg)
return return
} }
delete(c.respWait, string(msg.ID)) delete(c.respWait, string(msg.ID))

120
rpc/endpoints.go Normal file
View File

@ -0,0 +1,120 @@
// Copyright 2018 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package rpc
import (
"github.com/ethereum/go-ethereum/log"
"net"
)
// StartHTTPEndpoint starts the HTTP RPC endpoint, configured with cors/vhosts/modules
func StartHTTPEndpoint(endpoint string, apis []API, modules []string, cors []string, vhosts []string) (net.Listener, *Server, error) {
// Generate the whitelist based on the allowed modules
whitelist := make(map[string]bool)
for _, module := range modules {
whitelist[module] = true
}
// Register all the APIs exposed by the services
handler := NewServer()
for _, api := range apis {
if whitelist[api.Namespace] || (len(whitelist) == 0 && api.Public) {
if err := handler.RegisterName(api.Namespace, api.Service); err != nil {
return nil, nil, err
}
log.Debug("HTTP registered", "namespace", api.Namespace)
}
}
// All APIs registered, start the HTTP listener
var (
listener net.Listener
err error
)
if listener, err = net.Listen("tcp", endpoint); err != nil {
return nil, nil, err
}
go NewHTTPServer(cors, vhosts, handler).Serve(listener)
return listener, handler, err
}
// StartWSEndpoint starts a websocket endpoint
func StartWSEndpoint(endpoint string, apis []API, modules []string, wsOrigins []string, exposeAll bool) (net.Listener, *Server, error) {
// Generate the whitelist based on the allowed modules
whitelist := make(map[string]bool)
for _, module := range modules {
whitelist[module] = true
}
// Register all the APIs exposed by the services
handler := NewServer()
for _, api := range apis {
if exposeAll || whitelist[api.Namespace] || (len(whitelist) == 0 && api.Public) {
if err := handler.RegisterName(api.Namespace, api.Service); err != nil {
return nil, nil, err
}
log.Debug("WebSocket registered", "service", api.Service, "namespace", api.Namespace)
}
}
// All APIs registered, start the HTTP listener
var (
listener net.Listener
err error
)
if listener, err = net.Listen("tcp", endpoint); err != nil {
return nil, nil, err
}
go NewWSServer(wsOrigins, handler).Serve(listener)
return listener, handler, err
}
// StartIPCEndpoint starts an IPC endpoint
func StartIPCEndpoint(isClosedFn func() bool, ipcEndpoint string, apis []API) (net.Listener, *Server, error) {
// Register all the APIs exposed by the services
handler := NewServer()
for _, api := range apis {
if err := handler.RegisterName(api.Namespace, api.Service); err != nil {
return nil, nil, err
}
log.Debug("IPC registered", "namespace", api.Namespace)
}
// All APIs registered, start the IPC listener
var (
listener net.Listener
err error
)
if listener, err = CreateIPCListener(ipcEndpoint); err != nil {
return nil, nil, err
}
go func() {
for {
conn, err := listener.Accept()
if err != nil {
// Terminate if the listener was closed
if isClosedFn() {
log.Info("IPC closed", "err", err)
} else {
// Not closed, just some error; report and continue
log.Error("IPC accept failed", "err", err)
}
continue
}
go handler.ServeCodec(NewJSONCodec(conn), OptionMethodInvocation|OptionSubscriptions)
}
}()
return listener, handler, nil
}

7
rpc/http.go
View File

@ -169,12 +169,17 @@ func (srv *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
// All checks passed, create a codec that reads direct from the request body // All checks passed, create a codec that reads direct from the request body
// untilEOF and writes the response to w and order the server to process a // untilEOF and writes the response to w and order the server to process a
// single request. // single request.
ctx := context.Background()
ctx = context.WithValue(ctx, "remote", r.RemoteAddr)
ctx = context.WithValue(ctx, "scheme", r.Proto)
ctx = context.WithValue(ctx, "local", r.Host)
body := io.LimitReader(r.Body, maxRequestContentLength) body := io.LimitReader(r.Body, maxRequestContentLength)
codec := NewJSONCodec(&httpReadWriteNopCloser{body, w}) codec := NewJSONCodec(&httpReadWriteNopCloser{body, w})
defer codec.Close() defer codec.Close()
w.Header().Set("content-type", contentType) w.Header().Set("content-type", contentType)
srv.ServeSingleRequest(codec, OptionMethodInvocation) srv.ServeSingleRequest(codec, OptionMethodInvocation, ctx)
} }
// validateRequest returns a non-zero response code and error message if the // validateRequest returns a non-zero response code and error message if the

11
rpc/server.go
View File

@ -125,7 +125,7 @@ func (s *Server) RegisterName(name string, rcvr interface{}) error {
// If singleShot is true it will process a single request, otherwise it will handle // If singleShot is true it will process a single request, otherwise it will handle
// requests until the codec returns an error when reading a request (in most cases // requests until the codec returns an error when reading a request (in most cases
// an EOF). It executes requests in parallel when singleShot is false. // an EOF). It executes requests in parallel when singleShot is false.
func (s *Server) serveRequest(codec ServerCodec, singleShot bool, options CodecOption) error { func (s *Server) serveRequest(codec ServerCodec, singleShot bool, options CodecOption, ctx context.Context) error {
var pend sync.WaitGroup var pend sync.WaitGroup
defer func() { defer func() {
@ -140,7 +140,8 @@ func (s *Server) serveRequest(codec ServerCodec, singleShot bool, options CodecO
s.codecsMu.Unlock() s.codecsMu.Unlock()
}() }()
ctx, cancel := context.WithCancel(context.Background()) // ctx, cancel := context.WithCancel(context.Background())
ctx, cancel := context.WithCancel(ctx)
defer cancel() defer cancel()
// if the codec supports notification include a notifier that callbacks can use // if the codec supports notification include a notifier that callbacks can use
@ -215,14 +216,14 @@ func (s *Server) serveRequest(codec ServerCodec, singleShot bool, options CodecO
// stopped. In either case the codec is closed. // stopped. In either case the codec is closed.
func (s *Server) ServeCodec(codec ServerCodec, options CodecOption) { func (s *Server) ServeCodec(codec ServerCodec, options CodecOption) {
defer codec.Close() defer codec.Close()
s.serveRequest(codec, false, options) s.serveRequest(codec, false, options, context.Background())
} }
// ServeSingleRequest reads and processes a single RPC request from the given codec. It will not // ServeSingleRequest reads and processes a single RPC request from the given codec. It will not
// close the codec unless a non-recoverable error has occurred. Note, this method will return after // close the codec unless a non-recoverable error has occurred. Note, this method will return after
// a single request has been processed! // a single request has been processed!
func (s *Server) ServeSingleRequest(codec ServerCodec, options CodecOption) { func (s *Server) ServeSingleRequest(codec ServerCodec, options CodecOption, ctx context.Context) {
s.serveRequest(codec, true, options) s.serveRequest(codec, true, options, ctx)
} }
// Stop will stop reading new requests, wait for stopPendingRequestTimeout to allow pending requests to finish, // Stop will stop reading new requests, wait for stopPendingRequestTimeout to allow pending requests to finish,

256
signer/core/abihelper.go Normal file
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@ -0,0 +1,256 @@
// Copyright 2018 The go-ethereum Authors
// This file is part of go-ethereum.
//
// go-ethereum is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// go-ethereum is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
package core
import (
"encoding/json"
"fmt"
"io/ioutil"
"strings"
"github.com/ethereum/go-ethereum/accounts/abi"
"github.com/ethereum/go-ethereum/common"
"bytes"
"os"
"regexp"
)
type decodedArgument struct {
soltype abi.Argument
value interface{}
}
type decodedCallData struct {
signature string
name string
inputs []decodedArgument
}
// String implements stringer interface, tries to use the underlying value-type
func (arg decodedArgument) String() string {
var value string
switch arg.value.(type) {
case fmt.Stringer:
value = arg.value.(fmt.Stringer).String()
default:
value = fmt.Sprintf("%v", arg.value)
}
return fmt.Sprintf("%v: %v", arg.soltype.Type.String(), value)
}
// String implements stringer interface for decodedCallData
func (cd decodedCallData) String() string {
args := make([]string, len(cd.inputs))
for i, arg := range cd.inputs {
args[i] = arg.String()
}
return fmt.Sprintf("%s(%s)", cd.name, strings.Join(args, ","))
}
// parseCallData matches the provided call data against the abi definition,
// and returns a struct containing the actual go-typed values
func parseCallData(calldata []byte, abidata string) (*decodedCallData, error) {
if len(calldata) < 4 {
return nil, fmt.Errorf("Invalid ABI-data, incomplete method signature of (%d bytes)", len(calldata))
}
sigdata, argdata := calldata[:4], calldata[4:]
if len(argdata)%32 != 0 {
return nil, fmt.Errorf("Not ABI-encoded data; length should be a multiple of 32 (was %d)", len(argdata))
}
abispec, err := abi.JSON(strings.NewReader(abidata))
if err != nil {
return nil, fmt.Errorf("Failed parsing JSON ABI: %v, abidata: %v", err, abidata)
}
method, err := abispec.MethodById(sigdata)
if err != nil {
return nil, err
}
v, err := method.Inputs.UnpackValues(argdata)
if err != nil {
return nil, err
}
decoded := decodedCallData{signature: method.Sig(), name: method.Name}
for n, argument := range method.Inputs {
if err != nil {
return nil, fmt.Errorf("Failed to decode argument %d (signature %v): %v", n, method.Sig(), err)
} else {
decodedArg := decodedArgument{
soltype: argument,
value: v[n],
}
decoded.inputs = append(decoded.inputs, decodedArg)
}
}
// We're finished decoding the data. At this point, we encode the decoded data to see if it matches with the
// original data. If we didn't do that, it would e.g. be possible to stuff extra data into the arguments, which
// is not detected by merely decoding the data.
var (
encoded []byte
)
encoded, err = method.Inputs.PackValues(v)
if err != nil {
return nil, err
}
if !bytes.Equal(encoded, argdata) {
was := common.Bytes2Hex(encoded)
exp := common.Bytes2Hex(argdata)
return nil, fmt.Errorf("WARNING: Supplied data is stuffed with extra data. \nWant %s\nHave %s\nfor method %v", exp, was, method.Sig())
}
return &decoded, nil
}
// MethodSelectorToAbi converts a method selector into an ABI struct. The returned data is a valid json string
// which can be consumed by the standard abi package.
func MethodSelectorToAbi(selector string) ([]byte, error) {
re := regexp.MustCompile(`^([^\)]+)\(([a-z0-9,\[\]]*)\)`)
type fakeArg struct {
Type string `json:"type"`
}
type fakeABI struct {
Name string `json:"name"`
Type string `json:"type"`
Inputs []fakeArg `json:"inputs"`
}
groups := re.FindStringSubmatch(selector)
if len(groups) != 3 {
return nil, fmt.Errorf("Did not match: %v (%v matches)", selector, len(groups))
}
name := groups[1]
args := groups[2]
arguments := make([]fakeArg, 0)
if len(args) > 0 {
for _, arg := range strings.Split(args, ",") {
arguments = append(arguments, fakeArg{arg})
}
}
abicheat := fakeABI{
name, "function", arguments,
}
return json.Marshal([]fakeABI{abicheat})
}
type AbiDb struct {
db map[string]string
customdb map[string]string
customdbPath string
}
// NewEmptyAbiDB exists for test purposes
func NewEmptyAbiDB() (*AbiDb, error) {
return &AbiDb{make(map[string]string), make(map[string]string), ""}, nil
}
// NewAbiDBFromFile loads signature database from file, and
// errors if the file is not valid json. Does no other validation of contents
func NewAbiDBFromFile(path string) (*AbiDb, error) {
raw, err := ioutil.ReadFile(path)
if err != nil {
return nil, err
}
db, err := NewEmptyAbiDB()
if err != nil {
return nil, err
}
json.Unmarshal(raw, &db.db)
return db, nil
}
// NewAbiDBFromFiles loads both the standard signature database and a custom database. The latter will be used
// to write new values into if they are submitted via the API
func NewAbiDBFromFiles(standard, custom string) (*AbiDb, error) {
db := &AbiDb{make(map[string]string), make(map[string]string), custom}
db.customdbPath = custom
raw, err := ioutil.ReadFile(standard)
if err != nil {
return nil, err
}
json.Unmarshal(raw, &db.db)
// Custom file may not exist. Will be created during save, if needed
if _, err := os.Stat(custom); err == nil {
raw, err = ioutil.ReadFile(custom)
if err != nil {
return nil, err
}
json.Unmarshal(raw, &db.customdb)
}
return db, nil
}
// LookupMethodSelector checks the given 4byte-sequence against the known ABI methods.
// OBS: This method does not validate the match, it's assumed the caller will do so
func (db *AbiDb) LookupMethodSelector(id []byte) (string, error) {
if len(id) < 4 {
return "", fmt.Errorf("Expected 4-byte id, got %d", len(id))
}
sig := common.ToHex(id[:4])
if key, exists := db.db[sig]; exists {
return key, nil
}
if key, exists := db.customdb[sig]; exists {
return key, nil
}
return "", fmt.Errorf("Signature %v not found", sig)
}
func (db *AbiDb) Size() int {
return len(db.db)
}
// saveCustomAbi saves a signature ephemerally. If custom file is used, also saves to disk
func (db *AbiDb) saveCustomAbi(selector, signature string) error {
db.customdb[signature] = selector
if db.customdbPath == "" {
return nil //Not an error per se, just not used
}
d, err := json.Marshal(db.customdb)
if err != nil {
return err
}
err = ioutil.WriteFile(db.customdbPath, d, 0600)
return err
}
// Adds a signature to the database, if custom database saving is enabled.
// OBS: This method does _not_ validate the correctness of the data,
// it is assumed that the caller has already done so
func (db *AbiDb) AddSignature(selector string, data []byte) error {
if len(data) < 4 {
return nil
}
_, err := db.LookupMethodSelector(data[:4])
if err == nil {
return nil
}
sig := common.ToHex(data[:4])
return db.saveCustomAbi(selector, sig)
}

247
signer/core/abihelper_test.go Normal file
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@ -0,0 +1,247 @@
// Copyright 2018 The go-ethereum Authors
// This file is part of go-ethereum.
//
// go-ethereum is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// go-ethereum is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
package core
import (
"fmt"
"strings"
"testing"
"io/ioutil"
"math/big"
"reflect"
"github.com/ethereum/go-ethereum/accounts/abi"
"github.com/ethereum/go-ethereum/common"
)
func verify(t *testing.T, jsondata, calldata string, exp []interface{}) {
abispec, err := abi.JSON(strings.NewReader(jsondata))
if err != nil {
t.Fatal(err)
}
cd := common.Hex2Bytes(calldata)
sigdata, argdata := cd[:4], cd[4:]
method, err := abispec.MethodById(sigdata)
if err != nil {
t.Fatal(err)
}
data, err := method.Inputs.UnpackValues(argdata)
if len(data) != len(exp) {
t.Fatalf("Mismatched length, expected %d, got %d", len(exp), len(data))
}
for i, elem := range data {
if !reflect.DeepEqual(elem, exp[i]) {
t.Fatalf("Unpack error, arg %d, got %v, want %v", i, elem, exp[i])
}
}
}
func TestNewUnpacker(t *testing.T) {
type unpackTest struct {
jsondata string
calldata string
exp []interface{}
}
testcases := []unpackTest{
{ // https://solidity.readthedocs.io/en/develop/abi-spec.html#use-of-dynamic-types
`[{"type":"function","name":"f", "inputs":[{"type":"uint256"},{"type":"uint32[]"},{"type":"bytes10"},{"type":"bytes"}]}]`,
// 0x123, [0x456, 0x789], "1234567890", "Hello, world!"
"8be65246" + "00000000000000000000000000000000000000000000000000000000000001230000000000000000000000000000000000000000000000000000000000000080313233343536373839300000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000e0000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000004560000000000000000000000000000000000000000000000000000000000000789000000000000000000000000000000000000000000000000000000000000000d48656c6c6f2c20776f726c642100000000000000000000000000000000000000",
[]interface{}{
big.NewInt(0x123),
[]uint32{0x456, 0x789},
[10]byte{49, 50, 51, 52, 53, 54, 55, 56, 57, 48},
common.Hex2Bytes("48656c6c6f2c20776f726c6421"),
},
}, { // https://github.com/ethereum/wiki/wiki/Ethereum-Contract-ABI#examples
`[{"type":"function","name":"sam","inputs":[{"type":"bytes"},{"type":"bool"},{"type":"uint256[]"}]}]`,
// "dave", true and [1,2,3]
"a5643bf20000000000000000000000000000000000000000000000000000000000000060000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000a0000000000000000000000000000000000000000000000000000000000000000464617665000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000003000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000003",
[]interface{}{
[]byte{0x64, 0x61, 0x76, 0x65},
true,
[]*big.Int{big.NewInt(1), big.NewInt(2), big.NewInt(3)},
},
}, {
`[{"type":"function","name":"send","inputs":[{"type":"uint256"}]}]`,
"a52c101e0000000000000000000000000000000000000000000000000000000000000012",
[]interface{}{big.NewInt(0x12)},
}, {
`[{"type":"function","name":"compareAndApprove","inputs":[{"type":"address"},{"type":"uint256"},{"type":"uint256"}]}]`,
"751e107900000000000000000000000000000133700000deadbeef00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001",
[]interface{}{
common.HexToAddress("0x00000133700000deadbeef000000000000000000"),
new(big.Int).SetBytes([]byte{0x00}),
big.NewInt(0x1),
},
},
}
for _, c := range testcases {
verify(t, c.jsondata, c.calldata, c.exp)
}
}
/*
func TestReflect(t *testing.T) {
a := big.NewInt(0)
b := new(big.Int).SetBytes([]byte{0x00})
if !reflect.DeepEqual(a, b) {
t.Fatalf("Nope, %v != %v", a, b)
}
}
*/
func TestCalldataDecoding(t *testing.T) {
// send(uint256) : a52c101e
// compareAndApprove(address,uint256,uint256) : 751e1079
// issue(address[],uint256) : 42958b54
jsondata := `
[
{"type":"function","name":"send","inputs":[{"name":"a","type":"uint256"}]},
{"type":"function","name":"compareAndApprove","inputs":[{"name":"a","type":"address"},{"name":"a","type":"uint256"},{"name":"a","type":"uint256"}]},
{"type":"function","name":"issue","inputs":[{"name":"a","type":"address[]"},{"name":"a","type":"uint256"}]},
{"type":"function","name":"sam","inputs":[{"name":"a","type":"bytes"},{"name":"a","type":"bool"},{"name":"a","type":"uint256[]"}]}
]`
//Expected failures
for _, hexdata := range []string{
"a52c101e00000000000000000000000000000000000000000000000000000000000000120000000000000000000000000000000000000000000000000000000000000042",
"a52c101e000000000000000000000000000000000000000000000000000000000000001200",
"a52c101e00000000000000000000000000000000000000000000000000000000000000",
"a52c101e",
"a52c10",
"",
// Too short
"751e10790000000000000000000000000000000000000000000000000000000000000012",
"751e1079FFffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
//Not valid multiple of 32
"deadbeef00000000000000000000000000000000000000000000000000000000000000",
//Too short 'issue'
"42958b5400000000000000000000000000000000000000000000000000000000000000120000000000000000000000000000000000000000000000000000000000000042",
// Too short compareAndApprove
"a52c101e00ff0000000000000000000000000000000000000000000000000000000000120000000000000000000000000000000000000000000000000000000000000042",
// From https://github.com/ethereum/wiki/wiki/Ethereum-Contract-ABI
// contains a bool with illegal values
"a5643bf20000000000000000000000000000000000000000000000000000000000000060000000000000000000000000000000000000000000000000000000000000001100000000000000000000000000000000000000000000000000000000000000a0000000000000000000000000000000000000000000000000000000000000000464617665000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000003000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000003",
} {
_, err := parseCallData(common.Hex2Bytes(hexdata), jsondata)
if err == nil {
t.Errorf("Expected decoding to fail: %s", hexdata)
}
}
//Expected success
for _, hexdata := range []string{
// From https://github.com/ethereum/wiki/wiki/Ethereum-Contract-ABI
"a5643bf20000000000000000000000000000000000000000000000000000000000000060000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000a0000000000000000000000000000000000000000000000000000000000000000464617665000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000003000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000003",
"a52c101e0000000000000000000000000000000000000000000000000000000000000012",
"a52c101eFFffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
"751e1079000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
"42958b54" +
// start of dynamic type
"0000000000000000000000000000000000000000000000000000000000000040" +
//uint256
"0000000000000000000000000000000000000000000000000000000000000001" +
// length of array
"0000000000000000000000000000000000000000000000000000000000000002" +
// array values
"000000000000000000000000000000000000000000000000000000000000dead" +
"000000000000000000000000000000000000000000000000000000000000beef",
} {
_, err := parseCallData(common.Hex2Bytes(hexdata), jsondata)
if err != nil {
t.Errorf("Unexpected failure on input %s:\n %v (%d bytes) ", hexdata, err, len(common.Hex2Bytes(hexdata)))
}
}
}
func TestSelectorUnmarshalling(t *testing.T) {
var (
db *AbiDb
err error
abistring []byte
abistruct abi.ABI
)
db, err = NewAbiDBFromFile("../../cmd/clef/4byte.json")
if err != nil {
t.Fatal(err)
}
fmt.Printf("DB size %v\n", db.Size())
for id, selector := range db.db {
abistring, err = MethodSelectorToAbi(selector)
if err != nil {
t.Error(err)
return
}
abistruct, err = abi.JSON(strings.NewReader(string(abistring)))
if err != nil {
t.Error(err)
return
}
m, err := abistruct.MethodById(common.Hex2Bytes(id[2:]))
if err != nil {
t.Error(err)
return
}
if m.Sig() != selector {
t.Errorf("Expected equality: %v != %v", m.Sig(), selector)
}
}
}
func TestCustomABI(t *testing.T) {
d, err := ioutil.TempDir("", "signer-4byte-test")
if err != nil {
t.Fatal(err)
}
filename := fmt.Sprintf("%s/4byte_custom.json", d)
abidb, err := NewAbiDBFromFiles("../../cmd/clef/4byte.json", filename)
if err != nil {
t.Fatal(err)
}
// Now we'll remove all existing signatures
abidb.db = make(map[string]string)
calldata := common.Hex2Bytes("a52c101edeadbeef")
_, err = abidb.LookupMethodSelector(calldata)
if err == nil {
t.Fatalf("Should not find a match on empty db")
}
if err = abidb.AddSignature("send(uint256)", calldata); err != nil {
t.Fatalf("Failed to save file: %v", err)
}
_, err = abidb.LookupMethodSelector(calldata)
if err != nil {
t.Fatalf("Should find a match for abi signature, got: %v", err)
}
//Check that it wrote to file
abidb2, err := NewAbiDBFromFile(filename)
if err != nil {
t.Fatalf("Failed to create new abidb: %v", err)
}
_, err = abidb2.LookupMethodSelector(calldata)
if err != nil {
t.Fatalf("Save failed: should find a match for abi signature after loading from disk")
}
}

500
signer/core/api.go Normal file
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@ -0,0 +1,500 @@
// Copyright 2018 The go-ethereum Authors
// This file is part of go-ethereum.
//
// go-ethereum is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// go-ethereum is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
package core
import (
"context"
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"math/big"
"reflect"
"github.com/ethereum/go-ethereum/accounts"
"github.com/ethereum/go-ethereum/accounts/keystore"
"github.com/ethereum/go-ethereum/accounts/usbwallet"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/internal/ethapi"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/rlp"
)
// ExternalAPI defines the external API through which signing requests are made.
type ExternalAPI interface {
// List available accounts
List(ctx context.Context) (Accounts, error)
// New request to create a new account
New(ctx context.Context) (accounts.Account, error)
// SignTransaction request to sign the specified transaction
SignTransaction(ctx context.Context, args SendTxArgs, methodSelector *string) (*ethapi.SignTransactionResult, error)
// Sign - request to sign the given data (plus prefix)
Sign(ctx context.Context, addr common.MixedcaseAddress, data hexutil.Bytes) (hexutil.Bytes, error)
// EcRecover - request to perform ecrecover
EcRecover(ctx context.Context, data, sig hexutil.Bytes) (common.Address, error)
// Export - request to export an account
Export(ctx context.Context, addr common.Address) (json.RawMessage, error)
// Import - request to import an account
Import(ctx context.Context, keyJSON json.RawMessage) (Account, error)
}
// SignerUI specifies what method a UI needs to implement to be able to be used as a UI for the signer
type SignerUI interface {
// ApproveTx prompt the user for confirmation to request to sign Transaction
ApproveTx(request *SignTxRequest) (SignTxResponse, error)
// ApproveSignData prompt the user for confirmation to request to sign data
ApproveSignData(request *SignDataRequest) (SignDataResponse, error)
// ApproveExport prompt the user for confirmation to export encrypted Account json
ApproveExport(request *ExportRequest) (ExportResponse, error)
// ApproveImport prompt the user for confirmation to import Account json
ApproveImport(request *ImportRequest) (ImportResponse, error)
// ApproveListing prompt the user for confirmation to list accounts
// the list of accounts to list can be modified by the UI
ApproveListing(request *ListRequest) (ListResponse, error)
// ApproveNewAccount prompt the user for confirmation to create new Account, and reveal to caller
ApproveNewAccount(request *NewAccountRequest) (NewAccountResponse, error)
// ShowError displays error message to user
ShowError(message string)
// ShowInfo displays info message to user
ShowInfo(message string)
// OnApprovedTx notifies the UI about a transaction having been successfully signed.
// This method can be used by a UI to keep track of e.g. how much has been sent to a particular recipient.
OnApprovedTx(tx ethapi.SignTransactionResult)
// OnSignerStartup is invoked when the signer boots, and tells the UI info about external API location and version
// information
OnSignerStartup(info StartupInfo)
}
// SignerAPI defines the actual implementation of ExternalAPI
type SignerAPI struct {
chainID *big.Int
am *accounts.Manager
UI SignerUI
validator *Validator
}
// Metadata about a request
type Metadata struct {
Remote string `json:"remote"`
Local string `json:"local"`
Scheme string `json:"scheme"`
}
// MetadataFromContext extracts Metadata from a given context.Context
func MetadataFromContext(ctx context.Context) Metadata {
m := Metadata{"NA", "NA", "NA"} // batman
if v := ctx.Value("remote"); v != nil {
m.Remote = v.(string)
}
if v := ctx.Value("scheme"); v != nil {
m.Scheme = v.(string)
}
if v := ctx.Value("local"); v != nil {
m.Local = v.(string)
}
return m
}
// String implements Stringer interface
func (m Metadata) String() string {
s, err := json.Marshal(m)
if err == nil {
return string(s)
}
return err.Error()
}
// types for the requests/response types between signer and UI
type (
// SignTxRequest contains info about a Transaction to sign
SignTxRequest struct {
Transaction SendTxArgs `json:"transaction"`
Callinfo []ValidationInfo `json:"call_info"`
Meta Metadata `json:"meta"`
}
// SignTxResponse result from SignTxRequest
SignTxResponse struct {
//The UI may make changes to the TX
Transaction SendTxArgs `json:"transaction"`
Approved bool `json:"approved"`
Password string `json:"password"`
}
// ExportRequest info about query to export accounts
ExportRequest struct {
Address common.Address `json:"address"`
Meta Metadata `json:"meta"`
}
// ExportResponse response to export-request
ExportResponse struct {
Approved bool `json:"approved"`
}
// ImportRequest info about request to import an Account
ImportRequest struct {
Meta Metadata `json:"meta"`
}
ImportResponse struct {
Approved bool `json:"approved"`
OldPassword string `json:"old_password"`
NewPassword string `json:"new_password"`
}
SignDataRequest struct {
Address common.MixedcaseAddress `json:"address"`
Rawdata hexutil.Bytes `json:"raw_data"`
Message string `json:"message"`
Hash hexutil.Bytes `json:"hash"`
Meta Metadata `json:"meta"`
}
SignDataResponse struct {
Approved bool `json:"approved"`
Password string
}
NewAccountRequest struct {
Meta Metadata `json:"meta"`
}
NewAccountResponse struct {
Approved bool `json:"approved"`
Password string `json:"password"`
}
ListRequest struct {
Accounts []Account `json:"accounts"`
Meta Metadata `json:"meta"`
}
ListResponse struct {
Accounts []Account `json:"accounts"`
}
Message struct {
Text string `json:"text"`
}
StartupInfo struct {
Info map[string]interface{} `json:"info"`
}
)
var ErrRequestDenied = errors.New("Request denied")
type errorWrapper struct {
msg string
err error
}
func (ew errorWrapper) String() string {
return fmt.Sprintf("%s\n%s", ew.msg, ew.err)
}
// NewSignerAPI creates a new API that can be used for Account management.
// ksLocation specifies the directory where to store the password protected private
// key that is generated when a new Account is created.
// noUSB disables USB support that is required to support hardware devices such as
// ledger and trezor.
func NewSignerAPI(chainID int64, ksLocation string, noUSB bool, ui SignerUI, abidb *AbiDb, lightKDF bool) *SignerAPI {
var (
backends []accounts.Backend
n, p = keystore.StandardScryptN, keystore.StandardScryptP
)
if lightKDF {
n, p = keystore.LightScryptN, keystore.LightScryptP
}
// support password based accounts
if len(ksLocation) > 0 {
backends = append(backends, keystore.NewKeyStore(ksLocation, n, p))
}
if !noUSB {
// Start a USB hub for Ledger hardware wallets
if ledgerhub, err := usbwallet.NewLedgerHub(); err != nil {
log.Warn(fmt.Sprintf("Failed to start Ledger hub, disabling: %v", err))
} else {
backends = append(backends, ledgerhub)
log.Debug("Ledger support enabled")
}
// Start a USB hub for Trezor hardware wallets
if trezorhub, err := usbwallet.NewTrezorHub(); err != nil {
log.Warn(fmt.Sprintf("Failed to start Trezor hub, disabling: %v", err))
} else {
backends = append(backends, trezorhub)
log.Debug("Trezor support enabled")
}
}
return &SignerAPI{big.NewInt(chainID), accounts.NewManager(backends...), ui, NewValidator(abidb)}
}
// List returns the set of wallet this signer manages. Each wallet can contain
// multiple accounts.
func (api *SignerAPI) List(ctx context.Context) (Accounts, error) {
var accs []Account
for _, wallet := range api.am.Wallets() {
for _, acc := range wallet.Accounts() {
acc := Account{Typ: "Account", URL: wallet.URL(), Address: acc.Address}
accs = append(accs, acc)
}
}
result, err := api.UI.ApproveListing(&ListRequest{Accounts: accs, Meta: MetadataFromContext(ctx)})
if err != nil {
return nil, err
}
if result.Accounts == nil {
return nil, ErrRequestDenied
}
return result.Accounts, nil
}
// New creates a new password protected Account. The private key is protected with
// the given password. Users are responsible to backup the private key that is stored
// in the keystore location thas was specified when this API was created.
func (api *SignerAPI) New(ctx context.Context) (accounts.Account, error) {
be := api.am.Backends(keystore.KeyStoreType)
if len(be) == 0 {
return accounts.Account{}, errors.New("password based accounts not supported")
}
resp, err := api.UI.ApproveNewAccount(&NewAccountRequest{MetadataFromContext(ctx)})
if err != nil {
return accounts.Account{}, err
}
if !resp.Approved {
return accounts.Account{}, ErrRequestDenied
}
return be[0].(*keystore.KeyStore).NewAccount(resp.Password)
}
// logDiff logs the difference between the incoming (original) transaction and the one returned from the signer.
// it also returns 'true' if the transaction was modified, to make it possible to configure the signer not to allow
// UI-modifications to requests
func logDiff(original *SignTxRequest, new *SignTxResponse) bool {
modified := false
if f0, f1 := original.Transaction.From, new.Transaction.From; !reflect.DeepEqual(f0, f1) {
log.Info("Sender-account changed by UI", "was", f0, "is", f1)
modified = true
}
if t0, t1 := original.Transaction.To, new.Transaction.To; !reflect.DeepEqual(t0, t1) {
log.Info("Recipient-account changed by UI", "was", t0, "is", t1)
modified = true
}
if g0, g1 := original.Transaction.Gas, new.Transaction.Gas; g0 != g1 {
modified = true
log.Info("Gas changed by UI", "was", g0, "is", g1)
}
if g0, g1 := big.Int(original.Transaction.GasPrice), big.Int(new.Transaction.GasPrice); g0.Cmp(&g1) != 0 {
modified = true
log.Info("GasPrice changed by UI", "was", g0, "is", g1)
}
if v0, v1 := big.Int(original.Transaction.Value), big.Int(new.Transaction.Value); v0.Cmp(&v1) != 0 {
modified = true
log.Info("Value changed by UI", "was", v0, "is", v1)
}
if d0, d1 := original.Transaction.Data, new.Transaction.Data; d0 != d1 {
d0s := ""
d1s := ""
if d0 != nil {
d0s = common.ToHex(*d0)
}
if d1 != nil {
d1s = common.ToHex(*d1)
}
if d1s != d0s {
modified = true
log.Info("Data changed by UI", "was", d0s, "is", d1s)
}
}
if n0, n1 := original.Transaction.Nonce, new.Transaction.Nonce; n0 != n1 {
modified = true
log.Info("Nonce changed by UI", "was", n0, "is", n1)
}
return modified
}
// SignTransaction signs the given Transaction and returns it both as json and rlp-encoded form
func (api *SignerAPI) SignTransaction(ctx context.Context, args SendTxArgs, methodSelector *string) (*ethapi.SignTransactionResult, error) {
var (
err error
result SignTxResponse
)
msgs, err := api.validator.ValidateTransaction(&args, methodSelector)
if err != nil {
return nil, err
}
req := SignTxRequest{
Transaction: args,
Meta: MetadataFromContext(ctx),
Callinfo: msgs.Messages,
}
// Process approval
result, err = api.UI.ApproveTx(&req)
if err != nil {
return nil, err
}
if !result.Approved {
return nil, ErrRequestDenied
}
// Log changes made by the UI to the signing-request
logDiff(&req, &result)
var (
acc accounts.Account
wallet accounts.Wallet
)
acc = accounts.Account{Address: result.Transaction.From.Address()}
wallet, err = api.am.Find(acc)
if err != nil {
return nil, err
}
// Convert fields into a real transaction
var unsignedTx = result.Transaction.toTransaction()
// The one to sign is the one that was returned from the UI
signedTx, err := wallet.SignTxWithPassphrase(acc, result.Password, unsignedTx, api.chainID)
if err != nil {
api.UI.ShowError(err.Error())
return nil, err
}
rlpdata, err := rlp.EncodeToBytes(signedTx)
response := ethapi.SignTransactionResult{Raw: rlpdata, Tx: signedTx}
// Finally, send the signed tx to the UI
api.UI.OnApprovedTx(response)
// ...and to the external caller
return &response, nil
}
// Sign calculates an Ethereum ECDSA signature for:
// keccack256("\x19Ethereum Signed Message:\n" + len(message) + message))
//
// Note, the produced signature conforms to the secp256k1 curve R, S and V values,
// where the V value will be 27 or 28 for legacy reasons.
//
// The key used to calculate the signature is decrypted with the given password.
//
// https://github.com/ethereum/go-ethereum/wiki/Management-APIs#personal_sign
func (api *SignerAPI) Sign(ctx context.Context, addr common.MixedcaseAddress, data hexutil.Bytes) (hexutil.Bytes, error) {
sighash, msg := SignHash(data)
// We make the request prior to looking up if we actually have the account, to prevent
// account-enumeration via the API
req := &SignDataRequest{Address: addr, Rawdata: data, Message: msg, Hash: sighash, Meta: MetadataFromContext(ctx)}
res, err := api.UI.ApproveSignData(req)
if err != nil {
return nil, err
}
if !res.Approved {
return nil, ErrRequestDenied
}
// Look up the wallet containing the requested signer
account := accounts.Account{Address: addr.Address()}
wallet, err := api.am.Find(account)
if err != nil {
return nil, err
}
// Assemble sign the data with the wallet
signature, err := wallet.SignHashWithPassphrase(account, res.Password, sighash)
if err != nil {
api.UI.ShowError(err.Error())
return nil, err
}
signature[64] += 27 // Transform V from 0/1 to 27/28 according to the yellow paper
return signature, nil
}
// EcRecover returns the address for the Account that was used to create the signature.
// Note, this function is compatible with eth_sign and personal_sign. As such it recovers
// the address of:
// hash = keccak256("\x19Ethereum Signed Message:\n"${message length}${message})
// addr = ecrecover(hash, signature)
//
// Note, the signature must conform to the secp256k1 curve R, S and V values, where
// the V value must be be 27 or 28 for legacy reasons.
//
// https://github.com/ethereum/go-ethereum/wiki/Management-APIs#personal_ecRecover
func (api *SignerAPI) EcRecover(ctx context.Context, data, sig hexutil.Bytes) (common.Address, error) {
if len(sig) != 65 {
return common.Address{}, fmt.Errorf("signature must be 65 bytes long")
}
if sig[64] != 27 && sig[64] != 28 {
return common.Address{}, fmt.Errorf("invalid Ethereum signature (V is not 27 or 28)")
}
sig[64] -= 27 // Transform yellow paper V from 27/28 to 0/1
hash, _ := SignHash(data)
rpk, err := crypto.Ecrecover(hash, sig)
if err != nil {
return common.Address{}, err
}
pubKey := crypto.ToECDSAPub(rpk)
recoveredAddr := crypto.PubkeyToAddress(*pubKey)
return recoveredAddr, nil
}
// SignHash is a helper function that calculates a hash for the given message that can be
// safely used to calculate a signature from.
//
// The hash is calculated as
// keccak256("\x19Ethereum Signed Message:\n"${message length}${message}).
//
// This gives context to the signed message and prevents signing of transactions.
func SignHash(data []byte) ([]byte, string) {
msg := fmt.Sprintf("\x19Ethereum Signed Message:\n%d%s", len(data), data)
return crypto.Keccak256([]byte(msg)), msg
}
// Export returns encrypted private key associated with the given address in web3 keystore format.
func (api *SignerAPI) Export(ctx context.Context, addr common.Address) (json.RawMessage, error) {
res, err := api.UI.ApproveExport(&ExportRequest{Address: addr, Meta: MetadataFromContext(ctx)})
if err != nil {
return nil, err
}
if !res.Approved {
return nil, ErrRequestDenied
}
// Look up the wallet containing the requested signer
wallet, err := api.am.Find(accounts.Account{Address: addr})
if err != nil {
return nil, err
}
if wallet.URL().Scheme != keystore.KeyStoreScheme {
return nil, fmt.Errorf("Account is not a keystore-account")
}
return ioutil.ReadFile(wallet.URL().Path)
}
// Imports tries to import the given keyJSON in the local keystore. The keyJSON data is expected to be
// in web3 keystore format. It will decrypt the keyJSON with the given passphrase and on successful
// decryption it will encrypt the key with the given newPassphrase and store it in the keystore.
func (api *SignerAPI) Import(ctx context.Context, keyJSON json.RawMessage) (Account, error) {
be := api.am.Backends(keystore.KeyStoreType)
if len(be) == 0 {
return Account{}, errors.New("password based accounts not supported")
}
res, err := api.UI.ApproveImport(&ImportRequest{Meta: MetadataFromContext(ctx)})
if err != nil {
return Account{}, err
}
if !res.Approved {
return Account{}, ErrRequestDenied
}
acc, err := be[0].(*keystore.KeyStore).Import(keyJSON, res.OldPassword, res.NewPassword)
if err != nil {
api.UI.ShowError(err.Error())
return Account{}, err
}
return Account{Typ: "Account", URL: acc.URL, Address: acc.Address}, nil
}

386
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// Copyright 2018 The go-ethereum Authors
// This file is part of go-ethereum.
//
// go-ethereum is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// go-ethereum is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
//
package core
import (
"bytes"
"context"
"fmt"
"io/ioutil"
"math/big"
"os"
"path/filepath"
"testing"
"time"
"github.com/ethereum/go-ethereum/accounts/keystore"
"github.com/ethereum/go-ethereum/cmd/utils"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/internal/ethapi"
"github.com/ethereum/go-ethereum/rlp"
)
//Used for testing
type HeadlessUI struct {
controller chan string
}
func (ui *HeadlessUI) OnSignerStartup(info StartupInfo) {
}
func (ui *HeadlessUI) OnApprovedTx(tx ethapi.SignTransactionResult) {
fmt.Printf("OnApproved called")
}
func (ui *HeadlessUI) ApproveTx(request *SignTxRequest) (SignTxResponse, error) {
switch <-ui.controller {
case "Y":
return SignTxResponse{request.Transaction, true, <-ui.controller}, nil
case "M": //Modify
old := big.Int(request.Transaction.Value)
newVal := big.NewInt(0).Add(&old, big.NewInt(1))
request.Transaction.Value = hexutil.Big(*newVal)
return SignTxResponse{request.Transaction, true, <-ui.controller}, nil
default:
return SignTxResponse{request.Transaction, false, ""}, nil
}
}
func (ui *HeadlessUI) ApproveSignData(request *SignDataRequest) (SignDataResponse, error) {
if "Y" == <-ui.controller {
return SignDataResponse{true, <-ui.controller}, nil
}
return SignDataResponse{false, ""}, nil
}
func (ui *HeadlessUI) ApproveExport(request *ExportRequest) (ExportResponse, error) {
return ExportResponse{<-ui.controller == "Y"}, nil
}
func (ui *HeadlessUI) ApproveImport(request *ImportRequest) (ImportResponse, error) {
if "Y" == <-ui.controller {
return ImportResponse{true, <-ui.controller, <-ui.controller}, nil
}
return ImportResponse{false, "", ""}, nil
}
func (ui *HeadlessUI) ApproveListing(request *ListRequest) (ListResponse, error) {
switch <-ui.controller {
case "A":
return ListResponse{request.Accounts}, nil
case "1":
l := make([]Account, 1)
l[0] = request.Accounts[1]
return ListResponse{l}, nil
default:
return ListResponse{nil}, nil
}
}
func (ui *HeadlessUI) ApproveNewAccount(request *NewAccountRequest) (NewAccountResponse, error) {
if "Y" == <-ui.controller {
return NewAccountResponse{true, <-ui.controller}, nil
}
return NewAccountResponse{false, ""}, nil
}
func (ui *HeadlessUI) ShowError(message string) {
//stdout is used by communication
fmt.Fprint(os.Stderr, message)
}
func (ui *HeadlessUI) ShowInfo(message string) {
//stdout is used by communication
fmt.Fprint(os.Stderr, message)
}
func tmpDirName(t *testing.T) string {
d, err := ioutil.TempDir("", "eth-keystore-test")
if err != nil {
t.Fatal(err)
}
d, err = filepath.EvalSymlinks(d)
if err != nil {
t.Fatal(err)
}
return d
}
func setup(t *testing.T) (*SignerAPI, chan string) {
controller := make(chan string, 10)
db, err := NewAbiDBFromFile("../../cmd/clef/4byte.json")
if err != nil {
utils.Fatalf(err.Error())
}
var (
ui = &HeadlessUI{controller}
api = NewSignerAPI(
1,
tmpDirName(t),
true,
ui,
db,
true)
)
return api, controller
}
func createAccount(control chan string, api *SignerAPI, t *testing.T) {
control <- "Y"
control <- "apassword"
_, err := api.New(context.Background())
if err != nil {
t.Fatal(err)
}
// Some time to allow changes to propagate
time.Sleep(250 * time.Millisecond)
}
func failCreateAccount(control chan string, api *SignerAPI, t *testing.T) {
control <- "N"
acc, err := api.New(context.Background())
if err != ErrRequestDenied {
t.Fatal(err)
}
if acc.Address != (common.Address{}) {
t.Fatal("Empty address should be returned")
}
}
func list(control chan string, api *SignerAPI, t *testing.T) []Account {
control <- "A"
list, err := api.List(context.Background())
if err != nil {
t.Fatal(err)
}
return list
}
func TestNewAcc(t *testing.T) {
api, control := setup(t)
verifyNum := func(num int) {
if list := list(control, api, t); len(list) != num {
t.Errorf("Expected %d accounts, got %d", num, len(list))
}
}
// Testing create and create-deny
createAccount(control, api, t)
createAccount(control, api, t)
failCreateAccount(control, api, t)
failCreateAccount(control, api, t)
createAccount(control, api, t)
failCreateAccount(control, api, t)
createAccount(control, api, t)
failCreateAccount(control, api, t)
verifyNum(4)
// Testing listing:
// Listing one Account
control <- "1"
list, err := api.List(context.Background())
if err != nil {
t.Fatal(err)
}
if len(list) != 1 {
t.Fatalf("List should only show one Account")
}
// Listing denied
control <- "Nope"
list, err = api.List(context.Background())
if len(list) != 0 {
t.Fatalf("List should be empty")
}
if err != ErrRequestDenied {
t.Fatal("Expected deny")
}
}
func TestSignData(t *testing.T) {
api, control := setup(t)
//Create two accounts
createAccount(control, api, t)
createAccount(control, api, t)
control <- "1"
list, err := api.List(context.Background())
if err != nil {
t.Fatal(err)
}
a := common.NewMixedcaseAddress(list[0].Address)
control <- "Y"
control <- "wrongpassword"
h, err := api.Sign(context.Background(), a, []byte("EHLO world"))
if h != nil {
t.Errorf("Expected nil-data, got %x", h)
}
if err != keystore.ErrDecrypt {
t.Errorf("Expected ErrLocked! %v", err)
}
control <- "No way"
h, err = api.Sign(context.Background(), a, []byte("EHLO world"))
if h != nil {
t.Errorf("Expected nil-data, got %x", h)
}
if err != ErrRequestDenied {
t.Errorf("Expected ErrRequestDenied! %v", err)
}
control <- "Y"
control <- "apassword"
h, err = api.Sign(context.Background(), a, []byte("EHLO world"))
if err != nil {
t.Fatal(err)
}
if h == nil || len(h) != 65 {
t.Errorf("Expected 65 byte signature (got %d bytes)", len(h))
}
}
func mkTestTx(from common.MixedcaseAddress) SendTxArgs {
to := common.NewMixedcaseAddress(common.HexToAddress("0x1337"))
gas := hexutil.Uint64(21000)
gasPrice := (hexutil.Big)(*big.NewInt(2000000000))
value := (hexutil.Big)(*big.NewInt(1e18))
nonce := (hexutil.Uint64)(0)
data := hexutil.Bytes(common.Hex2Bytes("01020304050607080a"))
tx := SendTxArgs{
From: from,
To: &to,
Gas: gas,
GasPrice: gasPrice,
Value: value,
Data: &data,
Nonce: nonce}
return tx
}
func TestSignTx(t *testing.T) {
var (
list Accounts
res, res2 *ethapi.SignTransactionResult
err error
)
api, control := setup(t)
createAccount(control, api, t)
control <- "A"
list, err = api.List(context.Background())
if err != nil {
t.Fatal(err)
}
a := common.NewMixedcaseAddress(list[0].Address)
methodSig := "test(uint)"
tx := mkTestTx(a)
control <- "Y"
control <- "wrongpassword"
res, err = api.SignTransaction(context.Background(), tx, &methodSig)
if res != nil {
t.Errorf("Expected nil-response, got %v", res)
}
if err != keystore.ErrDecrypt {
t.Errorf("Expected ErrLocked! %v", err)
}
control <- "No way"
res, err = api.SignTransaction(context.Background(), tx, &methodSig)
if res != nil {
t.Errorf("Expected nil-response, got %v", res)
}
if err != ErrRequestDenied {
t.Errorf("Expected ErrRequestDenied! %v", err)
}
control <- "Y"
control <- "apassword"
res, err = api.SignTransaction(context.Background(), tx, &methodSig)
if err != nil {
t.Fatal(err)
}
parsedTx := &types.Transaction{}
rlp.Decode(bytes.NewReader(res.Raw), parsedTx)
//The tx should NOT be modified by the UI
if parsedTx.Value().Cmp(tx.Value.ToInt()) != 0 {
t.Errorf("Expected value to be unchanged, expected %v got %v", tx.Value, parsedTx.Value())
}
control <- "Y"
control <- "apassword"
res2, err = api.SignTransaction(context.Background(), tx, &methodSig)
if err != nil {
t.Fatal(err)
}
if !bytes.Equal(res.Raw, res2.Raw) {
t.Error("Expected tx to be unmodified by UI")
}
//The tx is modified by the UI
control <- "M"
control <- "apassword"
res2, err = api.SignTransaction(context.Background(), tx, &methodSig)
if err != nil {
t.Fatal(err)
}
parsedTx2 := &types.Transaction{}
rlp.Decode(bytes.NewReader(res.Raw), parsedTx2)
//The tx should be modified by the UI
if parsedTx2.Value().Cmp(tx.Value.ToInt()) != 0 {
t.Errorf("Expected value to be unchanged, got %v", parsedTx.Value())
}
if bytes.Equal(res.Raw, res2.Raw) {
t.Error("Expected tx to be modified by UI")
}
}
/*
func TestAsyncronousResponses(t *testing.T){
//Set up one account
api, control := setup(t)
createAccount(control, api, t)
// Two transactions, the second one with larger value than the first
tx1 := mkTestTx()
newVal := big.NewInt(0).Add((*big.Int) (tx1.Value), big.NewInt(1))
tx2 := mkTestTx()
tx2.Value = (*hexutil.Big)(newVal)
control <- "W" //wait
control <- "Y" //
control <- "apassword"
control <- "Y" //
control <- "apassword"
var err error
h1, err := api.SignTransaction(context.Background(), common.HexToAddress("1111"), tx1, nil)
h2, err := api.SignTransaction(context.Background(), common.HexToAddress("2222"), tx2, nil)
}
*/

110
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// Copyright 2018 The go-ethereum Authors
// This file is part of go-ethereum.
//
// go-ethereum is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// go-ethereum is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
package core
import (
"context"
"encoding/json"
"github.com/ethereum/go-ethereum/accounts"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/ethereum/go-ethereum/internal/ethapi"
"github.com/ethereum/go-ethereum/log"
)
type AuditLogger struct {
log log.Logger
api ExternalAPI
}
func (l *AuditLogger) List(ctx context.Context) (Accounts, error) {
l.log.Info("List", "type", "request", "metadata", MetadataFromContext(ctx).String())
res, e := l.api.List(ctx)
l.log.Info("List", "type", "response", "data", res.String())
return res, e
}
func (l *AuditLogger) New(ctx context.Context) (accounts.Account, error) {
return l.api.New(ctx)
}
func (l *AuditLogger) SignTransaction(ctx context.Context, args SendTxArgs, methodSelector *string) (*ethapi.SignTransactionResult, error) {
sel := "<nil>"
if methodSelector != nil {
sel = *methodSelector
}
l.log.Info("SignTransaction", "type", "request", "metadata", MetadataFromContext(ctx).String(),
"tx", args.String(),
"methodSelector", sel)
res, e := l.api.SignTransaction(ctx, args, methodSelector)
if res != nil {
l.log.Info("SignTransaction", "type", "response", "data", common.Bytes2Hex(res.Raw), "error", e)
} else {
l.log.Info("SignTransaction", "type", "response", "data", res, "error", e)
}
return res, e
}
func (l *AuditLogger) Sign(ctx context.Context, addr common.MixedcaseAddress, data hexutil.Bytes) (hexutil.Bytes, error) {
l.log.Info("Sign", "type", "request", "metadata", MetadataFromContext(ctx).String(),
"addr", addr.String(), "data", common.Bytes2Hex(data))
b, e := l.api.Sign(ctx, addr, data)
l.log.Info("Sign", "type", "response", "data", common.Bytes2Hex(b), "error", e)
return b, e
}
func (l *AuditLogger) EcRecover(ctx context.Context, data, sig hexutil.Bytes) (common.Address, error) {
l.log.Info("EcRecover", "type", "request", "metadata", MetadataFromContext(ctx).String(),
"data", common.Bytes2Hex(data))
a, e := l.api.EcRecover(ctx, data, sig)
l.log.Info("EcRecover", "type", "response", "addr", a.String(), "error", e)
return a, e
}
func (l *AuditLogger) Export(ctx context.Context, addr common.Address) (json.RawMessage, error) {
l.log.Info("Export", "type", "request", "metadata", MetadataFromContext(ctx).String(),
"addr", addr.Hex())
j, e := l.api.Export(ctx, addr)
// In this case, we don't actually log the json-response, which may be extra sensitive
l.log.Info("Export", "type", "response", "json response size", len(j), "error", e)
return j, e
}
func (l *AuditLogger) Import(ctx context.Context, keyJSON json.RawMessage) (Account, error) {
// Don't actually log the json contents
l.log.Info("Import", "type", "request", "metadata", MetadataFromContext(ctx).String(),
"keyJSON size", len(keyJSON))
a, e := l.api.Import(ctx, keyJSON)
l.log.Info("Import", "type", "response", "addr", a.String(), "error", e)
return a, e
}
func NewAuditLogger(path string, api ExternalAPI) (*AuditLogger, error) {
l := log.New("api", "signer")
handler, err := log.FileHandler(path, log.LogfmtFormat())
if err != nil {
return nil, err
}
l.SetHandler(handler)
l.Info("Configured", "audit log", path)
return &AuditLogger{l, api}, nil
}

247
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// Copyright 2018 The go-ethereum Authors
// This file is part of go-ethereum.
//
// go-ethereum is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// go-ethereum is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
package core
import (
"bufio"
"fmt"
"os"
"strings"
"sync"
"github.com/davecgh/go-spew/spew"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/internal/ethapi"
"github.com/ethereum/go-ethereum/log"
"golang.org/x/crypto/ssh/terminal"
)
type CommandlineUI struct {
in *bufio.Reader
mu sync.Mutex
}
func NewCommandlineUI() *CommandlineUI {
return &CommandlineUI{in: bufio.NewReader(os.Stdin)}
}
// readString reads a single line from stdin, trimming if from spaces, enforcing
// non-emptyness.
func (ui *CommandlineUI) readString() string {
for {
fmt.Printf("> ")
text, err := ui.in.ReadString('\n')
if err != nil {
log.Crit("Failed to read user input", "err", err)
}
if text = strings.TrimSpace(text); text != "" {
return text
}
}
}
// readPassword reads a single line from stdin, trimming it from the trailing new
// line and returns it. The input will not be echoed.
func (ui *CommandlineUI) readPassword() string {
fmt.Printf("Enter password to approve:\n")
fmt.Printf("> ")
text, err := terminal.ReadPassword(int(os.Stdin.Fd()))
if err != nil {
log.Crit("Failed to read password", "err", err)
}
fmt.Println()
fmt.Println("-----------------------")
return string(text)
}
// readPassword reads a single line from stdin, trimming it from the trailing new
// line and returns it. The input will not be echoed.
func (ui *CommandlineUI) readPasswordText(inputstring string) string {
fmt.Printf("Enter %s:\n", inputstring)
fmt.Printf("> ")
text, err := terminal.ReadPassword(int(os.Stdin.Fd()))
if err != nil {
log.Crit("Failed to read password", "err", err)
}
fmt.Println("-----------------------")
return string(text)
}
// confirm returns true if user enters 'Yes', otherwise false
func (ui *CommandlineUI) confirm() bool {
fmt.Printf("Approve? [y/N]:\n")
if ui.readString() == "y" {
return true
}
fmt.Println("-----------------------")
return false
}
func showMetadata(metadata Metadata) {
fmt.Printf("Request context:\n\t%v -> %v -> %v\n", metadata.Remote, metadata.Scheme, metadata.Local)
}
// ApproveTx prompt the user for confirmation to request to sign Transaction
func (ui *CommandlineUI) ApproveTx(request *SignTxRequest) (SignTxResponse, error) {
ui.mu.Lock()
defer ui.mu.Unlock()
weival := request.Transaction.Value.ToInt()
fmt.Printf("--------- Transaction request-------------\n")
if to := request.Transaction.To; to != nil {
fmt.Printf("to: %v\n", to.Original())
if !to.ValidChecksum() {
fmt.Printf("\nWARNING: Invalid checksum on to-address!\n\n")
}
} else {
fmt.Printf("to: <contact creation>\n")
}
fmt.Printf("from: %v\n", request.Transaction.From.String())
fmt.Printf("value: %v wei\n", weival)
if request.Transaction.Data != nil {
d := *request.Transaction.Data
if len(d) > 0 {
fmt.Printf("data: %v\n", common.Bytes2Hex(d))
}
}
if request.Callinfo != nil {
fmt.Printf("\nTransaction validation:\n")
for _, m := range request.Callinfo {
fmt.Printf(" * %s : %s", m.Typ, m.Message)
}
fmt.Println()
}
fmt.Printf("\n")
showMetadata(request.Meta)
fmt.Printf("-------------------------------------------\n")
if !ui.confirm() {
return SignTxResponse{request.Transaction, false, ""}, nil
}
return SignTxResponse{request.Transaction, true, ui.readPassword()}, nil
}
// ApproveSignData prompt the user for confirmation to request to sign data
func (ui *CommandlineUI) ApproveSignData(request *SignDataRequest) (SignDataResponse, error) {
ui.mu.Lock()
defer ui.mu.Unlock()
fmt.Printf("-------- Sign data request--------------\n")
fmt.Printf("Account: %s\n", request.Address.String())
fmt.Printf("message: \n%q\n", request.Message)
fmt.Printf("raw data: \n%v\n", request.Rawdata)
fmt.Printf("message hash: %v\n", request.Hash)
fmt.Printf("-------------------------------------------\n")
showMetadata(request.Meta)
if !ui.confirm() {
return SignDataResponse{false, ""}, nil
}
return SignDataResponse{true, ui.readPassword()}, nil
}
// ApproveExport prompt the user for confirmation to export encrypted Account json
func (ui *CommandlineUI) ApproveExport(request *ExportRequest) (ExportResponse, error) {
ui.mu.Lock()
defer ui.mu.Unlock()
fmt.Printf("-------- Export Account request--------------\n")
fmt.Printf("A request has been made to export the (encrypted) keyfile\n")
fmt.Printf("Approving this operation means that the caller obtains the (encrypted) contents\n")
fmt.Printf("\n")
fmt.Printf("Account: %x\n", request.Address)
//fmt.Printf("keyfile: \n%v\n", request.file)
fmt.Printf("-------------------------------------------\n")
showMetadata(request.Meta)
return ExportResponse{ui.confirm()}, nil
}
// ApproveImport prompt the user for confirmation to import Account json
func (ui *CommandlineUI) ApproveImport(request *ImportRequest) (ImportResponse, error) {
ui.mu.Lock()
defer ui.mu.Unlock()
fmt.Printf("-------- Import Account request--------------\n")
fmt.Printf("A request has been made to import an encrypted keyfile\n")
fmt.Printf("-------------------------------------------\n")
showMetadata(request.Meta)
if !ui.confirm() {
return ImportResponse{false, "", ""}, nil
}
return ImportResponse{true, ui.readPasswordText("Old password"), ui.readPasswordText("New password")}, nil
}
// ApproveListing prompt the user for confirmation to list accounts
// the list of accounts to list can be modified by the UI
func (ui *CommandlineUI) ApproveListing(request *ListRequest) (ListResponse, error) {
ui.mu.Lock()
defer ui.mu.Unlock()
fmt.Printf("-------- List Account request--------------\n")
fmt.Printf("A request has been made to list all accounts. \n")
fmt.Printf("You can select which accounts the caller can see\n")
for _, account := range request.Accounts {
fmt.Printf("\t[x] %v\n", account.Address.Hex())
}
fmt.Printf("-------------------------------------------\n")
showMetadata(request.Meta)
if !ui.confirm() {
return ListResponse{nil}, nil
}
return ListResponse{request.Accounts}, nil
}
// ApproveNewAccount prompt the user for confirmation to create new Account, and reveal to caller
func (ui *CommandlineUI) ApproveNewAccount(request *NewAccountRequest) (NewAccountResponse, error) {
ui.mu.Lock()
defer ui.mu.Unlock()
fmt.Printf("-------- New Account request--------------\n")
fmt.Printf("A request has been made to create a new. \n")
fmt.Printf("Approving this operation means that a new Account is created,\n")
fmt.Printf("and the address show to the caller\n")
showMetadata(request.Meta)
if !ui.confirm() {
return NewAccountResponse{false, ""}, nil
}
return NewAccountResponse{true, ui.readPassword()}, nil
}
// ShowError displays error message to user
func (ui *CommandlineUI) ShowError(message string) {
fmt.Printf("ERROR: %v\n", message)
}
// ShowInfo displays info message to user
func (ui *CommandlineUI) ShowInfo(message string) {
fmt.Printf("Info: %v\n", message)
}
func (ui *CommandlineUI) OnApprovedTx(tx ethapi.SignTransactionResult) {
fmt.Printf("Transaction signed:\n ")
spew.Dump(tx.Tx)
}
func (ui *CommandlineUI) OnSignerStartup(info StartupInfo) {
fmt.Printf("------- Signer info -------\n")
for k, v := range info.Info {
fmt.Printf("* %v : %v\n", k, v)
}
}

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// Copyright 2018 The go-ethereum Authors
// This file is part of go-ethereum.
//
// go-ethereum is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// go-ethereum is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
//
package core
import (
"context"
"sync"
"github.com/ethereum/go-ethereum/internal/ethapi"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/rpc"
)
type StdIOUI struct {
client rpc.Client
mu sync.Mutex
}
func NewStdIOUI() *StdIOUI {
log.Info("NewStdIOUI")
client, err := rpc.DialContext(context.Background(), "stdio://")
if err != nil {
log.Crit("Could not create stdio client", "err", err)
}
return &StdIOUI{client: *client}
}
// dispatch sends a request over the stdio
func (ui *StdIOUI) dispatch(serviceMethod string, args interface{}, reply interface{}) error {
err := ui.client.Call(&reply, serviceMethod, args)
if err != nil {
log.Info("Error", "exc", err.Error())
}
return err
}
func (ui *StdIOUI) ApproveTx(request *SignTxRequest) (SignTxResponse, error) {
var result SignTxResponse
err := ui.dispatch("ApproveTx", request, &result)
return result, err
}
func (ui *StdIOUI) ApproveSignData(request *SignDataRequest) (SignDataResponse, error) {
var result SignDataResponse
err := ui.dispatch("ApproveSignData", request, &result)
return result, err
}
func (ui *StdIOUI) ApproveExport(request *ExportRequest) (ExportResponse, error) {
var result ExportResponse
err := ui.dispatch("ApproveExport", request, &result)
return result, err
}
func (ui *StdIOUI) ApproveImport(request *ImportRequest) (ImportResponse, error) {
var result ImportResponse
err := ui.dispatch("ApproveImport", request, &result)
return result, err
}
func (ui *StdIOUI) ApproveListing(request *ListRequest) (ListResponse, error) {
var result ListResponse
err := ui.dispatch("ApproveListing", request, &result)
return result, err
}
func (ui *StdIOUI) ApproveNewAccount(request *NewAccountRequest) (NewAccountResponse, error) {
var result NewAccountResponse
err := ui.dispatch("ApproveNewAccount", request, &result)
return result, err
}
func (ui *StdIOUI) ShowError(message string) {
err := ui.dispatch("ShowError", &Message{message}, nil)
if err != nil {
log.Info("Error calling 'ShowError'", "exc", err.Error(), "msg", message)
}
}
func (ui *StdIOUI) ShowInfo(message string) {
err := ui.dispatch("ShowInfo", Message{message}, nil)
if err != nil {
log.Info("Error calling 'ShowInfo'", "exc", err.Error(), "msg", message)
}
}
func (ui *StdIOUI) OnApprovedTx(tx ethapi.SignTransactionResult) {
err := ui.dispatch("OnApprovedTx", tx, nil)
if err != nil {
log.Info("Error calling 'OnApprovedTx'", "exc", err.Error(), "tx", tx)
}
}
func (ui *StdIOUI) OnSignerStartup(info StartupInfo) {
err := ui.dispatch("OnSignerStartup", info, nil)
if err != nil {
log.Info("Error calling 'OnSignerStartup'", "exc", err.Error(), "info", info)
}
}

95
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// Copyright 2018 The go-ethereum Authors
// This file is part of go-ethereum.
//
// go-ethereum is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// go-ethereum is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
package core
import (
"encoding/json"
"strings"
"math/big"
"github.com/ethereum/go-ethereum/accounts"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/ethereum/go-ethereum/core/types"
)
type Accounts []Account
func (as Accounts) String() string {
var output []string
for _, a := range as {
output = append(output, a.String())
}
return strings.Join(output, "\n")
}
type Account struct {
Typ string `json:"type"`
URL accounts.URL `json:"url"`
Address common.Address `json:"address"`
}
func (a Account) String() string {
s, err := json.Marshal(a)
if err == nil {
return string(s)
}
return err.Error()
}
type ValidationInfo struct {
Typ string `json:"type"`
Message string `json:"message"`
}
type ValidationMessages struct {
Messages []ValidationInfo
}
// SendTxArgs represents the arguments to submit a transaction
type SendTxArgs struct {
From common.MixedcaseAddress `json:"from"`
To *common.MixedcaseAddress `json:"to"`
Gas hexutil.Uint64 `json:"gas"`
GasPrice hexutil.Big `json:"gasPrice"`
Value hexutil.Big `json:"value"`
Nonce hexutil.Uint64 `json:"nonce"`
// We accept "data" and "input" for backwards-compatibility reasons.
Data *hexutil.Bytes `json:"data"`
Input *hexutil.Bytes `json:"input"`
}
func (t SendTxArgs) String() string {
s, err := json.Marshal(t)
if err == nil {
return string(s)
}
return err.Error()
}
func (args *SendTxArgs) toTransaction() *types.Transaction {
var input []byte
if args.Data != nil {
input = *args.Data
} else if args.Input != nil {
input = *args.Input
}
if args.To == nil {
return types.NewContractCreation(uint64(args.Nonce), (*big.Int)(&args.Value), uint64(args.Gas), (*big.Int)(&args.GasPrice), input)
}
return types.NewTransaction(uint64(args.Nonce), args.To.Address(), (*big.Int)(&args.Value), (uint64)(args.Gas), (*big.Int)(&args.GasPrice), input)
}

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// Copyright 2018 The go-ethereum Authors
// This file is part of go-ethereum.
//
// go-ethereum is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// go-ethereum is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
package core
import (
"bytes"
"errors"
"fmt"
"math/big"
"github.com/ethereum/go-ethereum/common"
)
// The validation package contains validation checks for transactions
// - ABI-data validation
// - Transaction semantics validation
// The package provides warnings for typical pitfalls
func (vs *ValidationMessages) crit(msg string) {
vs.Messages = append(vs.Messages, ValidationInfo{"CRITICAL", msg})
}
func (vs *ValidationMessages) warn(msg string) {
vs.Messages = append(vs.Messages, ValidationInfo{"WARNING", msg})
}
func (vs *ValidationMessages) info(msg string) {
vs.Messages = append(vs.Messages, ValidationInfo{"Info", msg})
}
type Validator struct {
db *AbiDb
}
func NewValidator(db *AbiDb) *Validator {
return &Validator{db}
}
func testSelector(selector string, data []byte) (*decodedCallData, error) {
if selector == "" {
return nil, fmt.Errorf("selector not found")
}
abiData, err := MethodSelectorToAbi(selector)
if err != nil {
return nil, err
}
info, err := parseCallData(data, string(abiData))
if err != nil {
return nil, err
}
return info, nil
}
// validateCallData checks if the ABI-data + methodselector (if given) can be parsed and seems to match
func (v *Validator) validateCallData(msgs *ValidationMessages, data []byte, methodSelector *string) {
if len(data) == 0 {
return
}
if len(data) < 4 {
msgs.warn("Tx contains data which is not valid ABI")
return
}
var (
info *decodedCallData
err error
)
// Check the provided one
if methodSelector != nil {
info, err = testSelector(*methodSelector, data)
if err != nil {
msgs.warn(fmt.Sprintf("Tx contains data, but provided ABI signature could not be matched: %v", err))
} else {
msgs.info(info.String())
//Successfull match. add to db if not there already (ignore errors there)
v.db.AddSignature(*methodSelector, data[:4])
}
return
}
// Check the db
selector, err := v.db.LookupMethodSelector(data[:4])
if err != nil {
msgs.warn(fmt.Sprintf("Tx contains data, but the ABI signature could not be found: %v", err))
return
}
info, err = testSelector(selector, data)
if err != nil {
msgs.warn(fmt.Sprintf("Tx contains data, but provided ABI signature could not be matched: %v", err))
} else {
msgs.info(info.String())
}
}
// validateSemantics checks if the transactions 'makes sense', and generate warnings for a couple of typical scenarios
func (v *Validator) validate(msgs *ValidationMessages, txargs *SendTxArgs, methodSelector *string) error {
// Prevent accidental erroneous usage of both 'input' and 'data'
if txargs.Data != nil && txargs.Input != nil && !bytes.Equal(*txargs.Data, *txargs.Input) {
// This is a showstopper
return errors.New(`Ambiguous request: both "data" and "input" are set and are not identical`)
}
var (
data []byte
)
// Place data on 'data', and nil 'input'
if txargs.Input != nil {
txargs.Data = txargs.Input
txargs.Input = nil
}
if txargs.Data != nil {
data = *txargs.Data
}
if txargs.To == nil {
//Contract creation should contain sufficient data to deploy a contract
// A typical error is omitting sender due to some quirk in the javascript call
// e.g. https://github.com/ethereum/go-ethereum/issues/16106
if len(data) == 0 {
if txargs.Value.ToInt().Cmp(big.NewInt(0)) > 0 {
// Sending ether into black hole
return errors.New(`Tx will create contract with value but empty code!`)
}
// No value submitted at least
msgs.crit("Tx will create contract with empty code!")
} else if len(data) < 40 { //Arbitrary limit
msgs.warn(fmt.Sprintf("Tx will will create contract, but payload is suspiciously small (%d b)", len(data)))
}
// methodSelector should be nil for contract creation
if methodSelector != nil {
msgs.warn("Tx will create contract, but method selector supplied; indicating intent to call a method.")
}
} else {
if !txargs.To.ValidChecksum() {
msgs.warn("Invalid checksum on to-address")
}
// Normal transaction
if bytes.Equal(txargs.To.Address().Bytes(), common.Address{}.Bytes()) {
// Sending to 0
msgs.crit("Tx destination is the zero address!")
}
// Validate calldata
v.validateCallData(msgs, data, methodSelector)
}
return nil
}
// ValidateTransaction does a number of checks on the supplied transaction, and returns either a list of warnings,
// or an error, indicating that the transaction should be immediately rejected
func (v *Validator) ValidateTransaction(txArgs *SendTxArgs, methodSelector *string) (*ValidationMessages, error) {
msgs := &ValidationMessages{}
return msgs, v.validate(msgs, txArgs, methodSelector)
}

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// Copyright 2018 The go-ethereum Authors
// This file is part of go-ethereum.
//
// go-ethereum is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// go-ethereum is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
package core
import (
"fmt"
"math/big"
"testing"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
)
func hexAddr(a string) common.Address { return common.BytesToAddress(common.FromHex(a)) }
func mixAddr(a string) (*common.MixedcaseAddress, error) {
return common.NewMixedcaseAddressFromString(a)
}
func toHexBig(h string) hexutil.Big {
b := big.NewInt(0).SetBytes(common.FromHex(h))
return hexutil.Big(*b)
}
func toHexUint(h string) hexutil.Uint64 {
b := big.NewInt(0).SetBytes(common.FromHex(h))
return hexutil.Uint64(b.Uint64())
}
func dummyTxArgs(t txtestcase) *SendTxArgs {
to, _ := mixAddr(t.to)
from, _ := mixAddr(t.from)
n := toHexUint(t.n)
gas := toHexUint(t.g)
gasPrice := toHexBig(t.gp)
value := toHexBig(t.value)
var (
data, input *hexutil.Bytes
)
if t.d != "" {
a := hexutil.Bytes(common.FromHex(t.d))
data = &a
}
if t.i != "" {
a := hexutil.Bytes(common.FromHex(t.i))
input = &a
}
return &SendTxArgs{
From: *from,
To: to,
Value: value,
Nonce: n,
GasPrice: gasPrice,
Gas: gas,
Data: data,
Input: input,
}
}
type txtestcase struct {
from, to, n, g, gp, value, d, i string
expectErr bool
numMessages int
}
func TestValidator(t *testing.T) {
var (
// use empty db, there are other tests for the abi-specific stuff
db, _ = NewEmptyAbiDB()
v = NewValidator(db)
)
testcases := []txtestcase{
// Invalid to checksum
{from: "000000000000000000000000000000000000dead", to: "000000000000000000000000000000000000dead",
n: "0x01", g: "0x20", gp: "0x40", value: "0x01", numMessages: 1},
// valid 0x000000000000000000000000000000000000dEaD
{from: "000000000000000000000000000000000000dead", to: "0x000000000000000000000000000000000000dEaD",
n: "0x01", g: "0x20", gp: "0x40", value: "0x01", numMessages: 0},
// conflicting input and data
{from: "000000000000000000000000000000000000dead", to: "0x000000000000000000000000000000000000dEaD",
n: "0x01", g: "0x20", gp: "0x40", value: "0x01", d: "0x01", i: "0x02", expectErr: true},
// Data can't be parsed
{from: "000000000000000000000000000000000000dead", to: "0x000000000000000000000000000000000000dEaD",
n: "0x01", g: "0x20", gp: "0x40", value: "0x01", d: "0x0102", numMessages: 1},
// Data (on Input) can't be parsed
{from: "000000000000000000000000000000000000dead", to: "0x000000000000000000000000000000000000dEaD",
n: "0x01", g: "0x20", gp: "0x40", value: "0x01", i: "0x0102", numMessages: 1},
// Send to 0
{from: "000000000000000000000000000000000000dead", to: "0x0000000000000000000000000000000000000000",
n: "0x01", g: "0x20", gp: "0x40", value: "0x01", numMessages: 1},
// Create empty contract (no value)
{from: "000000000000000000000000000000000000dead", to: "",
n: "0x01", g: "0x20", gp: "0x40", value: "0x00", numMessages: 1},
// Create empty contract (with value)
{from: "000000000000000000000000000000000000dead", to: "",
n: "0x01", g: "0x20", gp: "0x40", value: "0x01", expectErr: true},
// Small payload for create
{from: "000000000000000000000000000000000000dead", to: "",
n: "0x01", g: "0x20", gp: "0x40", value: "0x01", d: "0x01", numMessages: 1},
}
for i, test := range testcases {
msgs, err := v.ValidateTransaction(dummyTxArgs(test), nil)
if err == nil && test.expectErr {
t.Errorf("Test %d, expected error", i)
for _, msg := range msgs.Messages {
fmt.Printf("* %s: %s\n", msg.Typ, msg.Message)
}
}
if err != nil && !test.expectErr {
t.Errorf("Test %d, unexpected error: %v", i, err)
}
if err == nil {
got := len(msgs.Messages)
if got != test.numMessages {
for _, msg := range msgs.Messages {
fmt.Printf("* %s: %s\n", msg.Typ, msg.Message)
}
t.Errorf("Test %d, expected %d messages, got %d", i, test.numMessages, got)
} else {
//Debug printout, remove later
for _, msg := range msgs.Messages {
fmt.Printf("* [%d] %s: %s\n", i, msg.Typ, msg.Message)
}
fmt.Println()
}
}
}
}

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// Copyright 2018 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
// Package deps contains the console JavaScript dependencies Go embedded.
package deps
//go:generate go-bindata -nometadata -pkg deps -o bindata.go bignumber.js
//go:generate gofmt -w -s bindata.go

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// Copyright 2018 The go-ethereum Authors
// This file is part of go-ethereum.
//
// go-ethereum is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// go-ethereum is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
package rules
import (
"encoding/json"
"fmt"
"os"
"strings"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/internal/ethapi"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/signer/core"
"github.com/ethereum/go-ethereum/signer/rules/deps"
"github.com/ethereum/go-ethereum/signer/storage"
"github.com/robertkrimen/otto"
)
var (
BigNumber_JS = deps.MustAsset("bignumber.js")
)
// consoleOutput is an override for the console.log and console.error methods to
// stream the output into the configured output stream instead of stdout.
func consoleOutput(call otto.FunctionCall) otto.Value {
output := []string{"JS:> "}
for _, argument := range call.ArgumentList {
output = append(output, fmt.Sprintf("%v", argument))
}
fmt.Fprintln(os.Stdout, strings.Join(output, " "))
return otto.Value{}
}
// rulesetUi provides an implementation of SignerUI that evaluates a javascript
// file for each defined UI-method
type rulesetUi struct {
next core.SignerUI // The next handler, for manual processing
storage storage.Storage
credentials storage.Storage
jsRules string // The rules to use
}
func NewRuleEvaluator(next core.SignerUI, jsbackend, credentialsBackend storage.Storage) (*rulesetUi, error) {
c := &rulesetUi{
next: next,
storage: jsbackend,
credentials: credentialsBackend,
jsRules: "",
}
return c, nil
}
func (r *rulesetUi) Init(javascriptRules string) error {
r.jsRules = javascriptRules
return nil
}
func (r *rulesetUi) execute(jsfunc string, jsarg interface{}) (otto.Value, error) {
// Instantiate a fresh vm engine every time
vm := otto.New()
// Set the native callbacks
consoleObj, _ := vm.Get("console")
consoleObj.Object().Set("log", consoleOutput)
consoleObj.Object().Set("error", consoleOutput)
vm.Set("storage", r.storage)
// Load bootstrap libraries
script, err := vm.Compile("bignumber.js", BigNumber_JS)
if err != nil {
log.Warn("Failed loading libraries", "err", err)
return otto.UndefinedValue(), err
}
vm.Run(script)
// Run the actual rule implementation
_, err = vm.Run(r.jsRules)
if err != nil {
log.Warn("Execution failed", "err", err)
return otto.UndefinedValue(), err
}
// And the actual call
// All calls are objects with the parameters being keys in that object.
// To provide additional insulation between js and go, we serialize it into JSON on the Go-side,
// and deserialize it on the JS side.
jsonbytes, err := json.Marshal(jsarg)
if err != nil {
log.Warn("failed marshalling data", "data", jsarg)
return otto.UndefinedValue(), err
}
// Now, we call foobar(JSON.parse(<jsondata>)).
var call string
if len(jsonbytes) > 0 {
call = fmt.Sprintf("%v(JSON.parse(%v))", jsfunc, string(jsonbytes))
} else {
call = fmt.Sprintf("%v()", jsfunc)
}
return vm.Run(call)
}
func (r *rulesetUi) checkApproval(jsfunc string, jsarg []byte, err error) (bool, error) {
if err != nil {
return false, err
}
v, err := r.execute(jsfunc, string(jsarg))
if err != nil {
log.Info("error occurred during execution", "error", err)
return false, err
}
result, err := v.ToString()
if err != nil {
log.Info("error occurred during response unmarshalling", "error", err)
return false, err
}
if result == "Approve" {
log.Info("Op approved")
return true, nil
} else if result == "Reject" {
log.Info("Op rejected")
return false, nil
}
return false, fmt.Errorf("Unknown response")
}
func (r *rulesetUi) ApproveTx(request *core.SignTxRequest) (core.SignTxResponse, error) {
jsonreq, err := json.Marshal(request)
approved, err := r.checkApproval("ApproveTx", jsonreq, err)
if err != nil {
log.Info("Rule-based approval error, going to manual", "error", err)
return r.next.ApproveTx(request)
}
if approved {
return core.SignTxResponse{
Transaction: request.Transaction,
Approved: true,
Password: r.lookupPassword(request.Transaction.From.Address()),
},
nil
}
return core.SignTxResponse{Approved: false}, err
}
func (r *rulesetUi) lookupPassword(address common.Address) string {
return r.credentials.Get(strings.ToLower(address.String()))
}
func (r *rulesetUi) ApproveSignData(request *core.SignDataRequest) (core.SignDataResponse, error) {
jsonreq, err := json.Marshal(request)
approved, err := r.checkApproval("ApproveSignData", jsonreq, err)
if err != nil {
log.Info("Rule-based approval error, going to manual", "error", err)
return r.next.ApproveSignData(request)
}
if approved {
return core.SignDataResponse{Approved: true, Password: r.lookupPassword(request.Address.Address())}, nil
}
return core.SignDataResponse{Approved: false, Password: ""}, err
}
func (r *rulesetUi) ApproveExport(request *core.ExportRequest) (core.ExportResponse, error) {
jsonreq, err := json.Marshal(request)
approved, err := r.checkApproval("ApproveExport", jsonreq, err)
if err != nil {
log.Info("Rule-based approval error, going to manual", "error", err)
return r.next.ApproveExport(request)
}
if approved {
return core.ExportResponse{Approved: true}, nil
}
return core.ExportResponse{Approved: false}, err
}
func (r *rulesetUi) ApproveImport(request *core.ImportRequest) (core.ImportResponse, error) {
// This cannot be handled by rules, requires setting a password
// dispatch to next
return r.next.ApproveImport(request)
}
func (r *rulesetUi) ApproveListing(request *core.ListRequest) (core.ListResponse, error) {
jsonreq, err := json.Marshal(request)
approved, err := r.checkApproval("ApproveListing", jsonreq, err)
if err != nil {
log.Info("Rule-based approval error, going to manual", "error", err)
return r.next.ApproveListing(request)
}
if approved {
return core.ListResponse{Accounts: request.Accounts}, nil
}
return core.ListResponse{}, err
}
func (r *rulesetUi) ApproveNewAccount(request *core.NewAccountRequest) (core.NewAccountResponse, error) {
// This cannot be handled by rules, requires setting a password
// dispatch to next
return r.next.ApproveNewAccount(request)
}
func (r *rulesetUi) ShowError(message string) {
log.Error(message)
r.next.ShowError(message)
}
func (r *rulesetUi) ShowInfo(message string) {
log.Info(message)
r.next.ShowInfo(message)
}
func (r *rulesetUi) OnSignerStartup(info core.StartupInfo) {
jsonInfo, err := json.Marshal(info)
if err != nil {
log.Warn("failed marshalling data", "data", info)
return
}
r.next.OnSignerStartup(info)
_, err = r.execute("OnSignerStartup", string(jsonInfo))
if err != nil {
log.Info("error occurred during execution", "error", err)
}
}
func (r *rulesetUi) OnApprovedTx(tx ethapi.SignTransactionResult) {
jsonTx, err := json.Marshal(tx)
if err != nil {
log.Warn("failed marshalling transaction", "tx", tx)
return
}
_, err = r.execute("OnApprovedTx", string(jsonTx))
if err != nil {
log.Info("error occurred during execution", "error", err)
}
}

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// Copyright 2018 The go-ethereum Authors
// This file is part of go-ethereum.
//
// go-ethereum is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// go-ethereum is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
//
package rules
import (
"fmt"
"math/big"
"strings"
"testing"
"github.com/ethereum/go-ethereum/accounts"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/internal/ethapi"
"github.com/ethereum/go-ethereum/signer/core"
"github.com/ethereum/go-ethereum/signer/storage"
)
const JS = `
/**
This is an example implementation of a Javascript rule file.
When the signer receives a request over the external API, the corresponding method is evaluated.
Three things can happen:
1. The method returns "Approve". This means the operation is permitted.
2. The method returns "Reject". This means the operation is rejected.
3. Anything else; other return values [*], method not implemented or exception occurred during processing. This means
that the operation will continue to manual processing, via the regular UI method chosen by the user.
[*] Note: Future version of the ruleset may use more complex json-based returnvalues, making it possible to not
only respond Approve/Reject/Manual, but also modify responses. For example, choose to list only one, but not all
accounts in a list-request. The points above will continue to hold for non-json based responses ("Approve"/"Reject").
**/
function ApproveListing(request){
console.log("In js approve listing");
console.log(request.accounts[3].Address)
console.log(request.meta.Remote)
return "Approve"
}
function ApproveTx(request){
console.log("test");
console.log("from");
return "Reject";
}
function test(thing){
console.log(thing.String())
}
`
func mixAddr(a string) (*common.MixedcaseAddress, error) {
return common.NewMixedcaseAddressFromString(a)
}
type alwaysDenyUi struct{}
func (alwaysDenyUi) OnSignerStartup(info core.StartupInfo) {
}
func (alwaysDenyUi) ApproveTx(request *core.SignTxRequest) (core.SignTxResponse, error) {
return core.SignTxResponse{Transaction: request.Transaction, Approved: false, Password: ""}, nil
}
func (alwaysDenyUi) ApproveSignData(request *core.SignDataRequest) (core.SignDataResponse, error) {
return core.SignDataResponse{Approved: false, Password: ""}, nil
}
func (alwaysDenyUi) ApproveExport(request *core.ExportRequest) (core.ExportResponse, error) {
return core.ExportResponse{Approved: false}, nil
}
func (alwaysDenyUi) ApproveImport(request *core.ImportRequest) (core.ImportResponse, error) {
return core.ImportResponse{Approved: false, OldPassword: "", NewPassword: ""}, nil
}
func (alwaysDenyUi) ApproveListing(request *core.ListRequest) (core.ListResponse, error) {
return core.ListResponse{Accounts: nil}, nil
}
func (alwaysDenyUi) ApproveNewAccount(request *core.NewAccountRequest) (core.NewAccountResponse, error) {
return core.NewAccountResponse{Approved: false, Password: ""}, nil
}
func (alwaysDenyUi) ShowError(message string) {
panic("implement me")
}
func (alwaysDenyUi) ShowInfo(message string) {
panic("implement me")
}
func (alwaysDenyUi) OnApprovedTx(tx ethapi.SignTransactionResult) {
panic("implement me")
}
func initRuleEngine(js string) (*rulesetUi, error) {
r, err := NewRuleEvaluator(&alwaysDenyUi{}, storage.NewEphemeralStorage(), storage.NewEphemeralStorage())
if err != nil {
return nil, fmt.Errorf("failed to create js engine: %v", err)
}
if err = r.Init(js); err != nil {
return nil, fmt.Errorf("failed to load bootstrap js: %v", err)
}
return r, nil
}
func TestListRequest(t *testing.T) {
accs := make([]core.Account, 5)
for i := range accs {
addr := fmt.Sprintf("000000000000000000000000000000000000000%x", i)
acc := core.Account{
Address: common.BytesToAddress(common.Hex2Bytes(addr)),
URL: accounts.URL{Scheme: "test", Path: fmt.Sprintf("acc-%d", i)},
}
accs[i] = acc
}
js := `function ApproveListing(){ return "Approve" }`
r, err := initRuleEngine(js)
if err != nil {
t.Errorf("Couldn't create evaluator %v", err)
return
}
resp, err := r.ApproveListing(&core.ListRequest{
Accounts: accs,
Meta: core.Metadata{Remote: "remoteip", Local: "localip", Scheme: "inproc"},
})
if len(resp.Accounts) != len(accs) {
t.Errorf("Expected check to resolve to 'Approve'")
}
}
func TestSignTxRequest(t *testing.T) {
js := `
function ApproveTx(r){
console.log("transaction.from", r.transaction.from);
console.log("transaction.to", r.transaction.to);
console.log("transaction.value", r.transaction.value);
console.log("transaction.nonce", r.transaction.nonce);
if(r.transaction.from.toLowerCase()=="0x0000000000000000000000000000000000001337"){ return "Approve"}
if(r.transaction.from.toLowerCase()=="0x000000000000000000000000000000000000dead"){ return "Reject"}
}`
r, err := initRuleEngine(js)
if err != nil {
t.Errorf("Couldn't create evaluator %v", err)
return
}
to, err := mixAddr("000000000000000000000000000000000000dead")
if err != nil {
t.Error(err)
return
}
from, err := mixAddr("0000000000000000000000000000000000001337")
if err != nil {
t.Error(err)
return
}
fmt.Printf("to %v", to.Address().String())
resp, err := r.ApproveTx(&core.SignTxRequest{
Transaction: core.SendTxArgs{
From: *from,
To: to},
Callinfo: nil,
Meta: core.Metadata{Remote: "remoteip", Local: "localip", Scheme: "inproc"},
})
if err != nil {
t.Errorf("Unexpected error %v", err)
}
if !resp.Approved {
t.Errorf("Expected check to resolve to 'Approve'")
}
}
type dummyUi struct {
calls []string
}
func (d *dummyUi) ApproveTx(request *core.SignTxRequest) (core.SignTxResponse, error) {
d.calls = append(d.calls, "ApproveTx")
return core.SignTxResponse{}, core.ErrRequestDenied
}
func (d *dummyUi) ApproveSignData(request *core.SignDataRequest) (core.SignDataResponse, error) {
d.calls = append(d.calls, "ApproveSignData")
return core.SignDataResponse{}, core.ErrRequestDenied
}
func (d *dummyUi) ApproveExport(request *core.ExportRequest) (core.ExportResponse, error) {
d.calls = append(d.calls, "ApproveExport")
return core.ExportResponse{}, core.ErrRequestDenied
}
func (d *dummyUi) ApproveImport(request *core.ImportRequest) (core.ImportResponse, error) {
d.calls = append(d.calls, "ApproveImport")
return core.ImportResponse{}, core.ErrRequestDenied
}
func (d *dummyUi) ApproveListing(request *core.ListRequest) (core.ListResponse, error) {
d.calls = append(d.calls, "ApproveListing")
return core.ListResponse{}, core.ErrRequestDenied
}
func (d *dummyUi) ApproveNewAccount(request *core.NewAccountRequest) (core.NewAccountResponse, error) {
d.calls = append(d.calls, "ApproveNewAccount")
return core.NewAccountResponse{}, core.ErrRequestDenied
}
func (d *dummyUi) ShowError(message string) {
d.calls = append(d.calls, "ShowError")
}
func (d *dummyUi) ShowInfo(message string) {
d.calls = append(d.calls, "ShowInfo")
}
func (d *dummyUi) OnApprovedTx(tx ethapi.SignTransactionResult) {
d.calls = append(d.calls, "OnApprovedTx")
}
func (d *dummyUi) OnSignerStartup(info core.StartupInfo) {
}
//TestForwarding tests that the rule-engine correctly dispatches requests to the next caller
func TestForwarding(t *testing.T) {
js := ""
ui := &dummyUi{make([]string, 0)}
jsBackend := storage.NewEphemeralStorage()
credBackend := storage.NewEphemeralStorage()
r, err := NewRuleEvaluator(ui, jsBackend, credBackend)
if err != nil {
t.Fatalf("Failed to create js engine: %v", err)
}
if err = r.Init(js); err != nil {
t.Fatalf("Failed to load bootstrap js: %v", err)
}
r.ApproveSignData(nil)
r.ApproveTx(nil)
r.ApproveImport(nil)
r.ApproveNewAccount(nil)
r.ApproveListing(nil)
r.ApproveExport(nil)
r.ShowError("test")
r.ShowInfo("test")
//This one is not forwarded
r.OnApprovedTx(ethapi.SignTransactionResult{})
expCalls := 8
if len(ui.calls) != expCalls {
t.Errorf("Expected %d forwarded calls, got %d: %s", expCalls, len(ui.calls), strings.Join(ui.calls, ","))
}
}
func TestMissingFunc(t *testing.T) {
r, err := initRuleEngine(JS)
if err != nil {
t.Errorf("Couldn't create evaluator %v", err)
return
}
_, err = r.execute("MissingMethod", "test")
if err == nil {
t.Error("Expected error")
}
approved, err := r.checkApproval("MissingMethod", nil, nil)
if err == nil {
t.Errorf("Expected missing method to yield error'")
}
if approved {
t.Errorf("Expected missing method to cause non-approval")
}
fmt.Printf("Err %v", err)
}
func TestStorage(t *testing.T) {
js := `
function testStorage(){
storage.Put("mykey", "myvalue")
a = storage.Get("mykey")
storage.Put("mykey", ["a", "list"]) // Should result in "a,list"
a += storage.Get("mykey")
storage.Put("mykey", {"an": "object"}) // Should result in "[object Object]"
a += storage.Get("mykey")
storage.Put("mykey", JSON.stringify({"an": "object"})) // Should result in '{"an":"object"}'
a += storage.Get("mykey")
a += storage.Get("missingkey") //Missing keys should result in empty string
storage.Put("","missing key==noop") // Can't store with 0-length key
a += storage.Get("") // Should result in ''
var b = new BigNumber(2)
var c = new BigNumber(16)//"0xf0",16)
var d = b.plus(c)
console.log(d)
return a
}
`
r, err := initRuleEngine(js)
if err != nil {
t.Errorf("Couldn't create evaluator %v", err)
return
}
v, err := r.execute("testStorage", nil)
if err != nil {
t.Errorf("Unexpected error %v", err)
}
retval, err := v.ToString()
if err != nil {
t.Errorf("Unexpected error %v", err)
}
exp := `myvaluea,list[object Object]{"an":"object"}`
if retval != exp {
t.Errorf("Unexpected data, expected '%v', got '%v'", exp, retval)
}
fmt.Printf("Err %v", err)
}
const ExampleTxWindow = `
function big(str){
if(str.slice(0,2) == "0x"){ return new BigNumber(str.slice(2),16)}
return new BigNumber(str)
}
// Time window: 1 week
var window = 1000* 3600*24*7;
// Limit : 1 ether
var limit = new BigNumber("1e18");
function isLimitOk(transaction){
var value = big(transaction.value)
// Start of our window function
var windowstart = new Date().getTime() - window;
var txs = [];
var stored = storage.Get('txs');
if(stored != ""){
txs = JSON.parse(stored)
}
// First, remove all that have passed out of the time-window
var newtxs = txs.filter(function(tx){return tx.tstamp > windowstart});
console.log(txs, newtxs.length);
// Secondly, aggregate the current sum
sum = new BigNumber(0)
sum = newtxs.reduce(function(agg, tx){ return big(tx.value).plus(agg)}, sum);
console.log("ApproveTx > Sum so far", sum);
console.log("ApproveTx > Requested", value.toNumber());
// Would we exceed weekly limit ?
return sum.plus(value).lt(limit)
}
function ApproveTx(r){
console.log(r)
console.log(typeof(r))
if (isLimitOk(r.transaction)){
return "Approve"
}
return "Nope"
}
/**
* OnApprovedTx(str) is called when a transaction has been approved and signed. The parameter
* 'response_str' contains the return value that will be sent to the external caller.
* The return value from this method is ignore - the reason for having this callback is to allow the
* ruleset to keep track of approved transactions.
*
* When implementing rate-limited rules, this callback should be used.
* If a rule responds with neither 'Approve' nor 'Reject' - the tx goes to manual processing. If the user
* then accepts the transaction, this method will be called.
*
* TLDR; Use this method to keep track of signed transactions, instead of using the data in ApproveTx.
*/
function OnApprovedTx(resp){
var value = big(resp.tx.value)
var txs = []
// Load stored transactions
var stored = storage.Get('txs');
if(stored != ""){
txs = JSON.parse(stored)
}
// Add this to the storage
txs.push({tstamp: new Date().getTime(), value: value});
storage.Put("txs", JSON.stringify(txs));
}
`
func dummyTx(value hexutil.Big) *core.SignTxRequest {
to, _ := mixAddr("000000000000000000000000000000000000dead")
from, _ := mixAddr("000000000000000000000000000000000000dead")
n := hexutil.Uint64(3)
gas := hexutil.Uint64(21000)
gasPrice := hexutil.Big(*big.NewInt(2000000))
return &core.SignTxRequest{
Transaction: core.SendTxArgs{
From: *from,
To: to,
Value: value,
Nonce: n,
GasPrice: gasPrice,
Gas: gas,
},
Callinfo: []core.ValidationInfo{
{Typ: "Warning", Message: "All your base are bellong to us"},
},
Meta: core.Metadata{Remote: "remoteip", Local: "localip", Scheme: "inproc"},
}
}
func dummyTxWithV(value uint64) *core.SignTxRequest {
v := big.NewInt(0).SetUint64(value)
h := hexutil.Big(*v)
return dummyTx(h)
}
func dummySigned(value *big.Int) *types.Transaction {
to := common.HexToAddress("000000000000000000000000000000000000dead")
gas := uint64(21000)
gasPrice := big.NewInt(2000000)
data := make([]byte, 0)
return types.NewTransaction(3, to, value, gas, gasPrice, data)
}
func TestLimitWindow(t *testing.T) {
r, err := initRuleEngine(ExampleTxWindow)
if err != nil {
t.Errorf("Couldn't create evaluator %v", err)
return
}
// 0.3 ether: 429D069189E0000 wei
v := big.NewInt(0).SetBytes(common.Hex2Bytes("0429D069189E0000"))
h := hexutil.Big(*v)
// The first three should succeed
for i := 0; i < 3; i++ {
unsigned := dummyTx(h)
resp, err := r.ApproveTx(unsigned)
if err != nil {
t.Errorf("Unexpected error %v", err)
}
if !resp.Approved {
t.Errorf("Expected check to resolve to 'Approve'")
}
// Create a dummy signed transaction
response := ethapi.SignTransactionResult{
Tx: dummySigned(v),
Raw: common.Hex2Bytes("deadbeef"),
}
r.OnApprovedTx(response)
}
// Fourth should fail
resp, err := r.ApproveTx(dummyTx(h))
if resp.Approved {
t.Errorf("Expected check to resolve to 'Reject'")
}
}
// dontCallMe is used as a next-handler that does not want to be called - it invokes test failure
type dontCallMe struct {
t *testing.T
}
func (d *dontCallMe) OnSignerStartup(info core.StartupInfo) {
}
func (d *dontCallMe) ApproveTx(request *core.SignTxRequest) (core.SignTxResponse, error) {
d.t.Fatalf("Did not expect next-handler to be called")
return core.SignTxResponse{}, core.ErrRequestDenied
}
func (d *dontCallMe) ApproveSignData(request *core.SignDataRequest) (core.SignDataResponse, error) {
d.t.Fatalf("Did not expect next-handler to be called")
return core.SignDataResponse{}, core.ErrRequestDenied
}
func (d *dontCallMe) ApproveExport(request *core.ExportRequest) (core.ExportResponse, error) {
d.t.Fatalf("Did not expect next-handler to be called")
return core.ExportResponse{}, core.ErrRequestDenied
}
func (d *dontCallMe) ApproveImport(request *core.ImportRequest) (core.ImportResponse, error) {
d.t.Fatalf("Did not expect next-handler to be called")
return core.ImportResponse{}, core.ErrRequestDenied
}
func (d *dontCallMe) ApproveListing(request *core.ListRequest) (core.ListResponse, error) {
d.t.Fatalf("Did not expect next-handler to be called")
return core.ListResponse{}, core.ErrRequestDenied
}
func (d *dontCallMe) ApproveNewAccount(request *core.NewAccountRequest) (core.NewAccountResponse, error) {
d.t.Fatalf("Did not expect next-handler to be called")
return core.NewAccountResponse{}, core.ErrRequestDenied
}
func (d *dontCallMe) ShowError(message string) {
d.t.Fatalf("Did not expect next-handler to be called")
}
func (d *dontCallMe) ShowInfo(message string) {
d.t.Fatalf("Did not expect next-handler to be called")
}
func (d *dontCallMe) OnApprovedTx(tx ethapi.SignTransactionResult) {
d.t.Fatalf("Did not expect next-handler to be called")
}
//TestContextIsCleared tests that the rule-engine does not retain variables over several requests.
// if it does, that would be bad since developers may rely on that to store data,
// instead of using the disk-based data storage
func TestContextIsCleared(t *testing.T) {
js := `
function ApproveTx(){
if (typeof foobar == 'undefined') {
foobar = "Approve"
}
console.log(foobar)
if (foobar == "Approve"){
foobar = "Reject"
}else{
foobar = "Approve"
}
return foobar
}
`
ui := &dontCallMe{t}
r, err := NewRuleEvaluator(ui, storage.NewEphemeralStorage(), storage.NewEphemeralStorage())
if err != nil {
t.Fatalf("Failed to create js engine: %v", err)
}
if err = r.Init(js); err != nil {
t.Fatalf("Failed to load bootstrap js: %v", err)
}
tx := dummyTxWithV(0)
r1, err := r.ApproveTx(tx)
r2, err := r.ApproveTx(tx)
if r1.Approved != r2.Approved {
t.Errorf("Expected execution context to be cleared between executions")
}
}
func TestSignData(t *testing.T) {
js := `function ApproveListing(){
return "Approve"
}
function ApproveSignData(r){
if( r.address.toLowerCase() == "0x694267f14675d7e1b9494fd8d72fefe1755710fa")
{
if(r.message.indexOf("bazonk") >= 0){
return "Approve"
}
return "Reject"
}
// Otherwise goes to manual processing
}`
r, err := initRuleEngine(js)
if err != nil {
t.Errorf("Couldn't create evaluator %v", err)
return
}
message := []byte("baz bazonk foo")
hash, msg := core.SignHash(message)
raw := hexutil.Bytes(message)
addr, _ := mixAddr("0x694267f14675d7e1b9494fd8d72fefe1755710fa")
fmt.Printf("address %v %v\n", addr.String(), addr.Original())
resp, err := r.ApproveSignData(&core.SignDataRequest{
Address: *addr,
Message: msg,
Hash: hash,
Meta: core.Metadata{Remote: "remoteip", Local: "localip", Scheme: "inproc"},
Rawdata: raw,
})
if err != nil {
t.Fatalf("Unexpected error %v", err)
}
if !resp.Approved {
t.Fatalf("Expected approved")
}
}

164
signer/storage/aes_gcm_storage.go Normal file
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// Copyright 2018 The go-ethereum Authors
// This file is part of go-ethereum.
//
// go-ethereum is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// go-ethereum is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
//
package storage
import (
"crypto/aes"
"crypto/cipher"
"crypto/rand"
"encoding/json"
"io"
"io/ioutil"
"os"
"github.com/ethereum/go-ethereum/log"
)
type storedCredential struct {
// The iv
Iv []byte `json:"iv"`
// The ciphertext
CipherText []byte `json:"c"`
}
// AESEncryptedStorage is a storage type which is backed by a json-faile. The json-file contains
// key-value mappings, where the keys are _not_ encrypted, only the values are.
type AESEncryptedStorage struct {
// File to read/write credentials
filename string
// Key stored in base64
key []byte
}
// NewAESEncryptedStorage creates a new encrypted storage backed by the given file/key
func NewAESEncryptedStorage(filename string, key []byte) *AESEncryptedStorage {
return &AESEncryptedStorage{
filename: filename,
key: key,
}
}
// Put stores a value by key. 0-length keys results in no-op
func (s *AESEncryptedStorage) Put(key, value string) {
if len(key) == 0 {
return
}
data, err := s.readEncryptedStorage()
if err != nil {
log.Warn("Failed to read encrypted storage", "err", err, "file", s.filename)
return
}
ciphertext, iv, err := encrypt(s.key, []byte(value))
if err != nil {
log.Warn("Failed to encrypt entry", "err", err)
return
}
encrypted := storedCredential{Iv: iv, CipherText: ciphertext}
data[key] = encrypted
if err = s.writeEncryptedStorage(data); err != nil {
log.Warn("Failed to write entry", "err", err)
}
}
// Get returns the previously stored value, or the empty string if it does not exist or key is of 0-length
func (s *AESEncryptedStorage) Get(key string) string {
if len(key) == 0 {
return ""
}
data, err := s.readEncryptedStorage()
if err != nil {
log.Warn("Failed to read encrypted storage", "err", err, "file", s.filename)
return ""
}
encrypted, exist := data[key]
if !exist {
log.Warn("Key does not exist", "key", key)
return ""
}
entry, err := decrypt(s.key, encrypted.Iv, encrypted.CipherText)
if err != nil {
log.Warn("Failed to decrypt key", "key", key)
return ""
}
return string(entry)
}
// readEncryptedStorage reads the file with encrypted creds
func (s *AESEncryptedStorage) readEncryptedStorage() (map[string]storedCredential, error) {
creds := make(map[string]storedCredential)
raw, err := ioutil.ReadFile(s.filename)
if err != nil {
if os.IsNotExist(err) {
// Doesn't exist yet
return creds, nil
} else {
log.Warn("Failed to read encrypted storage", "err", err, "file", s.filename)
}
}
if err = json.Unmarshal(raw, &creds); err != nil {
log.Warn("Failed to unmarshal encrypted storage", "err", err, "file", s.filename)
return nil, err
}
return creds, nil
}
// writeEncryptedStorage write the file with encrypted creds
func (s *AESEncryptedStorage) writeEncryptedStorage(creds map[string]storedCredential) error {
raw, err := json.Marshal(creds)
if err != nil {
return err
}
if err = ioutil.WriteFile(s.filename, raw, 0600); err != nil {
return err
}
return nil
}
func encrypt(key []byte, plaintext []byte) ([]byte, []byte, error) {
block, err := aes.NewCipher(key)
if err != nil {
return nil, nil, err
}
aesgcm, err := cipher.NewGCM(block)
nonce := make([]byte, aesgcm.NonceSize())
if _, err := io.ReadFull(rand.Reader, nonce); err != nil {
return nil, nil, err
}
if err != nil {
return nil, nil, err
}
ciphertext := aesgcm.Seal(nil, nonce, plaintext, nil)
return ciphertext, nonce, nil
}
func decrypt(key []byte, nonce []byte, ciphertext []byte) ([]byte, error) {
block, err := aes.NewCipher(key)
if err != nil {
return nil, err
}
aesgcm, err := cipher.NewGCM(block)
if err != nil {
return nil, err
}
plaintext, err := aesgcm.Open(nil, nonce, ciphertext, nil)
if err != nil {
return nil, err
}
return plaintext, nil
}

115
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// Copyright 2018 The go-ethereum Authors
// This file is part of go-ethereum.
//
// go-ethereum is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// go-ethereum is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
//
package storage
import (
"bytes"
"fmt"
"io/ioutil"
"testing"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/log"
"github.com/mattn/go-colorable"
)
func TestEncryption(t *testing.T) {
// key := []byte("AES256Key-32Characters1234567890")
// plaintext := []byte(value)
key := []byte("AES256Key-32Characters1234567890")
plaintext := []byte("exampleplaintext")
c, iv, err := encrypt(key, plaintext)
if err != nil {
t.Fatal(err)
}
fmt.Printf("Ciphertext %x, nonce %x\n", c, iv)
p, err := decrypt(key, iv, c)
if err != nil {
t.Fatal(err)
}
fmt.Printf("Plaintext %v\n", string(p))
if !bytes.Equal(plaintext, p) {
t.Errorf("Failed: expected plaintext recovery, got %v expected %v", string(plaintext), string(p))
}
}
func TestFileStorage(t *testing.T) {
a := map[string]storedCredential{
"secret": {
Iv: common.Hex2Bytes("cdb30036279601aeee60f16b"),
CipherText: common.Hex2Bytes("f311ac49859d7260c2c464c28ffac122daf6be801d3cfd3edcbde7e00c9ff74f"),
},
"secret2": {
Iv: common.Hex2Bytes("afb8a7579bf971db9f8ceeed"),
CipherText: common.Hex2Bytes("2df87baf86b5073ef1f03e3cc738de75b511400f5465bb0ddeacf47ae4dc267d"),
},
}
d, err := ioutil.TempDir("", "eth-encrypted-storage-test")
if err != nil {
t.Fatal(err)
}
stored := &AESEncryptedStorage{
filename: fmt.Sprintf("%v/vault.json", d),
key: []byte("AES256Key-32Characters1234567890"),
}
stored.writeEncryptedStorage(a)
read := &AESEncryptedStorage{
filename: fmt.Sprintf("%v/vault.json", d),
key: []byte("AES256Key-32Characters1234567890"),
}
creds, err := read.readEncryptedStorage()
if err != nil {
t.Fatal(err)
}
for k, v := range a {
if v2, exist := creds[k]; !exist {
t.Errorf("Missing entry %v", k)
} else {
if !bytes.Equal(v.CipherText, v2.CipherText) {
t.Errorf("Wrong ciphertext, expected %x got %x", v.CipherText, v2.CipherText)
}
if !bytes.Equal(v.Iv, v2.Iv) {
t.Errorf("Wrong iv")
}
}
}
}
func TestEnd2End(t *testing.T) {
log.Root().SetHandler(log.LvlFilterHandler(log.Lvl(3), log.StreamHandler(colorable.NewColorableStderr(), log.TerminalFormat(true))))
d, err := ioutil.TempDir("", "eth-encrypted-storage-test")
if err != nil {
t.Fatal(err)
}
s1 := &AESEncryptedStorage{
filename: fmt.Sprintf("%v/vault.json", d),
key: []byte("AES256Key-32Characters1234567890"),
}
s2 := &AESEncryptedStorage{
filename: fmt.Sprintf("%v/vault.json", d),
key: []byte("AES256Key-32Characters1234567890"),
}
s1.Put("bazonk", "foobar")
if v := s2.Get("bazonk"); v != "foobar" {
t.Errorf("Expected bazonk->foobar, got '%v'", v)
}
}

62
signer/storage/storage.go Normal file
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// Copyright 2018 The go-ethereum Authors
// This file is part of go-ethereum.
//
// go-ethereum is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// go-ethereum is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
//
package storage
import (
"fmt"
)
type Storage interface {
// Put stores a value by key. 0-length keys results in no-op
Put(key, value string)
// Get returns the previously stored value, or the empty string if it does not exist or key is of 0-length
Get(key string) string
}
// EphemeralStorage is an in-memory storage that does
// not persist values to disk. Mainly used for testing
type EphemeralStorage struct {
data map[string]string
namespace string
}
func (s *EphemeralStorage) Put(key, value string) {
if len(key) == 0 {
return
}
fmt.Printf("storage: put %v -> %v\n", key, value)
s.data[key] = value
}
func (s *EphemeralStorage) Get(key string) string {
if len(key) == 0 {
return ""
}
fmt.Printf("storage: get %v\n", key)
if v, exist := s.data[key]; exist {
return v
}
return ""
}
func NewEphemeralStorage() Storage {
s := &EphemeralStorage{
data: make(map[string]string),
}
return s
}