cerc-io/plugeth
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eth: disallow overwrite files via admin.exportChain

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This commit is contained in:
Martin Holst Swende 2019-08-30 10:39:29 +02:00
parent cc9eb91d30
commit 292cf7c649
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1 changed files with 5 additions and 0 deletions
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5
eth/api.go
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@ -168,6 +168,11 @@ func NewPrivateAdminAPI(eth *Ethereum) *PrivateAdminAPI {
// ExportChain exports the current blockchain into a local file. // ExportChain exports the current blockchain into a local file.
func (api *PrivateAdminAPI) ExportChain(file string) (bool, error) { func (api *PrivateAdminAPI) ExportChain(file string) (bool, error) {
if _, err := os.Stat(file); err == nil {
// File already exists. Allowing overwrite could be a DoS vecotor,
// since the 'file' may point to arbitrary paths on the drive
return false, errors.New("location would overwrite an existing file")
}
// Make sure we can create the file to export into // Make sure we can create the file to export into
out, err := os.OpenFile(file, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, os.ModePerm) out, err := os.OpenFile(file, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, os.ModePerm)
if err != nil { if err != nil {