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Only allow including from allowed directories.

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This commit is contained in:
chriseth 2016-01-29 23:09:05 +01:00
parent bdbb7d8a40
commit 0c5d892dba
2 changed files with 36 additions and 9 deletions
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42
solc/CommandLineInterface.cpp
View File

@ -27,6 +27,7 @@
#include <fstream>
#include <boost/filesystem.hpp>
#include <boost/filesystem/operations.hpp>
#include <boost/algorithm/string.hpp>
#include "solidity/BuildInfo.h"
@ -313,10 +314,11 @@ void CommandLineInterface::readInputFilesAndConfigureRemappings()
{
auto eq = find(infile.begin(), infile.end(), '=');
if (eq != infile.end())
m_remappings.push_back(make_pair(
string(infile.begin(), eq),
string(eq + 1, infile.end())
));
{
string target(eq + 1, infile.end());
m_remappings.push_back(make_pair(string(infile.begin(), eq), target));
m_allowedDirectories.push_back(boost::filesystem::path(target).remove_filename());
}
else
{
auto path = boost::filesystem::path(infile);
@ -332,7 +334,8 @@ void CommandLineInterface::readInputFilesAndConfigureRemappings()
continue;
}
m_sourceCodes[infile] = dev::contentsString(infile);
m_sourceCodes[path.string()] = dev::contentsString(path.string());
m_allowedDirectories.push_back(boost::filesystem::canonical(path).remove_filename());
}
}
// Add empty remapping to try the path itself.
@ -515,8 +518,9 @@ bool CommandLineInterface::processInput()
function<pair<string,string>(string const&)> fileReader = [this](string const& _path)
{
// Try to find the longest prefix match in all remappings. At the end, there will be an
// empty remapping so that we also try the path itself.
// Try to find the longest prefix match in all remappings. At the end, there will bean
// empty remapping so that we also try the path itself, but any file should be either
// in (a subdirectory of) the directory of an explicit source or a remapping target.
int errorLevel = 0;
size_t longestPrefix = 0;
string bestMatchPath;
@ -531,7 +535,26 @@ bool CommandLineInterface::processInput()
path.append(_path.begin() + virt.length(), _path.end());
auto boostPath = boost::filesystem::path(path);
if (!boost::filesystem::exists(boostPath))
{
errorLevel = max(errorLevel, 0);
continue;
}
boostPath = boost::filesystem::canonical(boostPath);
bool isAllowed = false;
for (auto const& dir: m_allowedDirectories)
{
// If dir is a prefix of boostPath, we are fine.
if (
std::distance(dir.begin(), dir.end()) <= std::distance(boostPath.begin(), boostPath.end()) &&
std::equal(dir.begin(), dir.end(), boostPath.begin())
)
{
isAllowed = true;
break;
}
}
if (!isAllowed)
errorLevel = max(errorLevel, 2);
else if (!boost::filesystem::is_regular_file(boostPath))
errorLevel = max(errorLevel, 1);
else
@ -544,9 +567,10 @@ bool CommandLineInterface::processInput()
return make_pair(m_sourceCodes[bestMatchPath] = dev::contentsString(bestMatchPath), string());
if (errorLevel == 0)
return make_pair(string(), string("File not found."));
else
else if (errorLevel == 1)
return make_pair(string(), string("Not a valid file."));
else
return make_pair(string(), string("File outside of allowed directories."));
};
m_compiler.reset(new CompilerStack(m_args.count(g_argAddStandard) > 0, fileReader));

3
solc/CommandLineInterface.h
View File

@ -24,6 +24,7 @@
#include <libsolidity/interface/CompilerStack.h>
#include <memory>
#include <boost/program_options.hpp>
#include <boost/filesystem/path.hpp>
namespace dev
{
@ -80,6 +81,8 @@ private:
std::map<std::string, std::string> m_sourceCodes;
/// list of path prefix remappings, e.g. github.com/ethereum -> /usr/local/ethereum
std::vector<std::pair<std::string, std::string>> m_remappings;
/// list of allowed directories to read files from
std::vector<boost::filesystem::path> m_allowedDirectories;
/// map of library names to addresses
std::map<std::string, h160> m_libraries;
/// Solidity compiler stack