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Merge pull request #2886 from gavinandresen/rpctiming

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Make RPC password resistant to timing attacks
This commit is contained in:
Gavin Andresen 2013-08-15 18:53:26 -07:00
commit a0bb001431
3 changed files with 27 additions and 1 deletions
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2
src/bitcoinrpc.cpp
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@ -476,7 +476,7 @@ bool HTTPAuthorized(map<string, string>& mapHeaders)
return false;
string strUserPass64 = strAuth.substr(6); boost::trim(strUserPass64);
string strUserPass = DecodeBase64(strUserPass64);
return strUserPass == strRPCUserColonPass;
return TimingResistantEqual(strUserPass, strRPCUserColonPass);
}
//

11
src/test/util_tests.cpp
View file

@ -291,4 +291,15 @@ BOOST_AUTO_TEST_CASE(util_seed_insecure_rand)
}
}
BOOST_AUTO_TEST_CASE(util_TimingResistantEqual)
{
BOOST_CHECK(TimingResistantEqual(std::string(""), std::string("")));
BOOST_CHECK(!TimingResistantEqual(std::string("abc"), std::string("")));
BOOST_CHECK(!TimingResistantEqual(std::string(""), std::string("abc")));
BOOST_CHECK(!TimingResistantEqual(std::string("a"), std::string("aa")));
BOOST_CHECK(!TimingResistantEqual(std::string("aa"), std::string("a")));
BOOST_CHECK(TimingResistantEqual(std::string("abc"), std::string("abc")));
BOOST_CHECK(!TimingResistantEqual(std::string("abc"), std::string("aba")));
}
BOOST_AUTO_TEST_SUITE_END()

15
src/util.h
View file

@ -437,6 +437,21 @@ static inline uint32_t insecure_rand(void)
*/
void seed_insecure_rand(bool fDeterministic=false);
/**
* Timing-attack-resistant comparison.
* Takes time proportional to length
* of first argument.
*/
template <typename T>
bool TimingResistantEqual(const T& a, const T& b)
{
if (b.size() == 0) return a.size() == 0;
size_t accumulator = a.size() ^ b.size();
for (size_t i = 0; i < a.size(); i++)
accumulator |= a[i] ^ b[i%b.size()];
return accumulator == 0;
}
/** Median filter over a stream of values.
* Returns the median of the last N numbers
*/