//
// Unit tests for denial-of-service detection/prevention code
//
+#include <algorithm>
+
+#include <boost/assign/list_of.hpp> // for 'map_list_of()'
+#include <boost/date_time/posix_time/posix_time_types.hpp>
#include <boost/test/unit_test.hpp>
#include <boost/foreach.hpp>
-#include "../main.h"
-#include "../net.h"
-#include "../util.h"
+#include "main.h"
+#include "wallet.h"
+#include "net.h"
+#include "util.h"
+
+#include <stdint.h>
+
+// Tests this internal-to-main.cpp method:
+extern bool AddOrphanTx(const CDataStream& vMsg);
+extern unsigned int LimitOrphanTxSize(unsigned int nMaxOrphans);
+extern std::map<uint256, CDataStream*> mapOrphanTransactions;
+extern std::map<uint256, std::map<uint256, CDataStream*> > mapOrphanTransactionsByPrev;
-using namespace std;
+CService ip(uint32_t i)
+{
+ struct in_addr s;
+ s.s_addr = i;
+ return CService(CNetAddr(s), GetDefaultPort());
+}
BOOST_AUTO_TEST_SUITE(DoS_tests)
BOOST_AUTO_TEST_CASE(DoS_banning)
{
CNode::ClearBanned();
- CAddress addr1(0xa0b0c001);
- CNode dummyNode1(INVALID_SOCKET, addr1, true);
+ CAddress addr1(ip(0xa0b0c001));
+ CNode dummyNode1(INVALID_SOCKET, addr1, "", true);
dummyNode1.Misbehaving(100); // Should get banned
- BOOST_CHECK(CNode::IsBanned(addr1.ip));
- BOOST_CHECK(!CNode::IsBanned(addr1.ip|0x0000ff00)); // Different ip, not banned
+ BOOST_CHECK(CNode::IsBanned(addr1));
+ BOOST_CHECK(!CNode::IsBanned(ip(0xa0b0c001|0x0000ff00))); // Different IP, not banned
- CAddress addr2(0xa0b0c002);
- CNode dummyNode2(INVALID_SOCKET, addr2, true);
+ CAddress addr2(ip(0xa0b0c002));
+ CNode dummyNode2(INVALID_SOCKET, addr2, "", true);
dummyNode2.Misbehaving(50);
- BOOST_CHECK(!CNode::IsBanned(addr2.ip)); // 2 not banned yet...
- BOOST_CHECK(CNode::IsBanned(addr1.ip)); // ... but 1 still should be
+ BOOST_CHECK(!CNode::IsBanned(addr2)); // 2 not banned yet...
+ BOOST_CHECK(CNode::IsBanned(addr1)); // ... but 1 still should be
dummyNode2.Misbehaving(50);
- BOOST_CHECK(CNode::IsBanned(addr2.ip));
+ BOOST_CHECK(CNode::IsBanned(addr2));
}
BOOST_AUTO_TEST_CASE(DoS_banscore)
{
CNode::ClearBanned();
mapArgs["-banscore"] = "111"; // because 11 is my favorite number
- CAddress addr1(0xa0b0c001);
- CNode dummyNode1(INVALID_SOCKET, addr1, true);
+ CAddress addr1(ip(0xa0b0c001));
+ CNode dummyNode1(INVALID_SOCKET, addr1, "", true);
dummyNode1.Misbehaving(100);
- BOOST_CHECK(!CNode::IsBanned(addr1.ip));
+ BOOST_CHECK(!CNode::IsBanned(addr1));
dummyNode1.Misbehaving(10);
- BOOST_CHECK(!CNode::IsBanned(addr1.ip));
+ BOOST_CHECK(!CNode::IsBanned(addr1));
dummyNode1.Misbehaving(1);
- BOOST_CHECK(CNode::IsBanned(addr1.ip));
- mapArgs["-banscore"] = "100";
+ BOOST_CHECK(CNode::IsBanned(addr1));
+ mapArgs.erase("-banscore");
}
BOOST_AUTO_TEST_CASE(DoS_bantime)
int64 nStartTime = GetTime();
SetMockTime(nStartTime); // Overrides future calls to GetTime()
- CAddress addr(0xa0b0c001);
- CNode dummyNode(INVALID_SOCKET, addr, true);
+ CAddress addr(ip(0xa0b0c001));
+ CNode dummyNode(INVALID_SOCKET, addr, "", true);
dummyNode.Misbehaving(100);
- BOOST_CHECK(CNode::IsBanned(addr.ip));
+ BOOST_CHECK(CNode::IsBanned(addr));
SetMockTime(nStartTime+60*60);
- BOOST_CHECK(CNode::IsBanned(addr.ip));
+ BOOST_CHECK(CNode::IsBanned(addr));
SetMockTime(nStartTime+60*60*24+1);
- BOOST_CHECK(!CNode::IsBanned(addr.ip));
-}
+ BOOST_CHECK(!CNode::IsBanned(addr));
+}
+
+static bool CheckNBits(unsigned int nbits1, int64 time1, unsigned int nbits2, int64 time2)\
+{
+ if (time1 > time2)
+ return CheckNBits(nbits2, time2, nbits1, time1);
+ int64 deltaTime = time2-time1;
+
+ CBigNum required;
+ required.SetCompact(ComputeMinWork(nbits1, deltaTime));
+ CBigNum have;
+ have.SetCompact(nbits2);
+ return (have <= required);
+}
+
+BOOST_AUTO_TEST_CASE(DoS_checknbits)
+{
+ using namespace boost::assign; // for 'map_list_of()'
+
+ // Timestamps,nBits from the bitcoin blockchain.
+ // These are the block-chain checkpoint blocks
+ typedef std::map<int64, unsigned int> BlockData;
+ BlockData chainData =
+ map_list_of(1239852051,486604799)(1262749024,486594666)
+ (1279305360,469854461)(1280200847,469830746)(1281678674,469809688)
+ (1296207707,453179945)(1302624061,453036989)(1309640330,437004818)
+ (1313172719,436789733);
+
+ // Make sure CheckNBits considers every combination of block-chain-lock-in-points
+ // "sane":
+ BOOST_FOREACH(const BlockData::value_type& i, chainData)
+ {
+ BOOST_FOREACH(const BlockData::value_type& j, chainData)
+ {
+ BOOST_CHECK(CheckNBits(i.second, i.first, j.second, j.first));
+ }
+ }
+
+ // Test a couple of insane combinations:
+ BlockData::value_type firstcheck = *(chainData.begin());
+ BlockData::value_type lastcheck = *(chainData.rbegin());
+
+ // First checkpoint difficulty at or a while after the last checkpoint time should fail when
+ // compared to last checkpoint
+ BOOST_CHECK(!CheckNBits(firstcheck.second, lastcheck.first+60*10, lastcheck.second, lastcheck.first));
+ BOOST_CHECK(!CheckNBits(firstcheck.second, lastcheck.first+60*60*24*14, lastcheck.second, lastcheck.first));
+
+ // ... but OK if enough time passed for difficulty to adjust downward:
+ BOOST_CHECK(CheckNBits(firstcheck.second, lastcheck.first+60*60*24*365*4, lastcheck.second, lastcheck.first));
+
+}
+
+CTransaction RandomOrphan()
+{
+ std::map<uint256, CDataStream*>::iterator it;
+ it = mapOrphanTransactions.lower_bound(GetRandHash());
+ if (it == mapOrphanTransactions.end())
+ it = mapOrphanTransactions.begin();
+ const CDataStream* pvMsg = it->second;
+ CTransaction tx;
+ CDataStream(*pvMsg) >> tx;
+ return tx;
+}
+
+BOOST_AUTO_TEST_CASE(DoS_mapOrphans)
+{
+ CKey key;
+ key.MakeNewKey(true);
+ CBasicKeyStore keystore;
+ keystore.AddKey(key);
+
+ // 50 orphan transactions:
+ for (int i = 0; i < 50; i++)
+ {
+ CTransaction tx;
+ tx.vin.resize(1);
+ tx.vin[0].prevout.n = 0;
+ tx.vin[0].prevout.hash = GetRandHash();
+ tx.vin[0].scriptSig << OP_1;
+ tx.vout.resize(1);
+ tx.vout[0].nValue = 1*CENT;
+ tx.vout[0].scriptPubKey.SetDestination(key.GetPubKey().GetID());
+
+ CDataStream ds(SER_DISK, CLIENT_VERSION);
+ ds << tx;
+ AddOrphanTx(ds);
+ }
+
+ // ... and 50 that depend on other orphans:
+ for (int i = 0; i < 50; i++)
+ {
+ CTransaction txPrev = RandomOrphan();
+
+ CTransaction tx;
+ tx.vin.resize(1);
+ tx.vin[0].prevout.n = 0;
+ tx.vin[0].prevout.hash = txPrev.GetHash();
+ tx.vout.resize(1);
+ tx.vout[0].nValue = 1*CENT;
+ tx.vout[0].scriptPubKey.SetDestination(key.GetPubKey().GetID());
+ SignSignature(keystore, txPrev, tx, 0);
+
+ CDataStream ds(SER_DISK, CLIENT_VERSION);
+ ds << tx;
+ AddOrphanTx(ds);
+ }
+ // This really-big orphan should be ignored:
+ for (int i = 0; i < 10; i++)
+ {
+ CTransaction txPrev = RandomOrphan();
+
+ CTransaction tx;
+ tx.vout.resize(1);
+ tx.vout[0].nValue = 1*CENT;
+ tx.vout[0].scriptPubKey.SetDestination(key.GetPubKey().GetID());
+ tx.vin.resize(500);
+ for (unsigned int j = 0; j < tx.vin.size(); j++)
+ {
+ tx.vin[j].prevout.n = j;
+ tx.vin[j].prevout.hash = txPrev.GetHash();
+ }
+ SignSignature(keystore, txPrev, tx, 0);
+ // Re-use same signature for other inputs
+ // (they don't have to be valid for this test)
+ for (unsigned int j = 1; j < tx.vin.size(); j++)
+ tx.vin[j].scriptSig = tx.vin[0].scriptSig;
+
+ CDataStream ds(SER_DISK, CLIENT_VERSION);
+ ds << tx;
+ BOOST_CHECK(!AddOrphanTx(ds));
+ }
+
+ // Test LimitOrphanTxSize() function:
+ LimitOrphanTxSize(40);
+ BOOST_CHECK(mapOrphanTransactions.size() <= 40);
+ LimitOrphanTxSize(10);
+ BOOST_CHECK(mapOrphanTransactions.size() <= 10);
+ LimitOrphanTxSize(0);
+ BOOST_CHECK(mapOrphanTransactions.empty());
+ BOOST_CHECK(mapOrphanTransactionsByPrev.empty());
+}
+
+BOOST_AUTO_TEST_CASE(DoS_checkSig)
+{
+ // Test signature caching code (see key.cpp Verify() methods)
+
+ CKey key;
+ key.MakeNewKey(true);
+ CBasicKeyStore keystore;
+ keystore.AddKey(key);
+
+ // 100 orphan transactions:
+ static const int NPREV=100;
+ CTransaction orphans[NPREV];
+ for (int i = 0; i < NPREV; i++)
+ {
+ CTransaction& tx = orphans[i];
+ tx.vin.resize(1);
+ tx.vin[0].prevout.n = 0;
+ tx.vin[0].prevout.hash = GetRandHash();
+ tx.vin[0].scriptSig << OP_1;
+ tx.vout.resize(1);
+ tx.vout[0].nValue = 1*CENT;
+ tx.vout[0].scriptPubKey.SetDestination(key.GetPubKey().GetID());
+
+ CDataStream ds(SER_DISK, CLIENT_VERSION);
+ ds << tx;
+ AddOrphanTx(ds);
+ }
+
+ // Create a transaction that depends on orphans:
+ CTransaction tx;
+ tx.vout.resize(1);
+ tx.vout[0].nValue = 1*CENT;
+ tx.vout[0].scriptPubKey.SetDestination(key.GetPubKey().GetID());
+ tx.vin.resize(NPREV);
+ for (unsigned int j = 0; j < tx.vin.size(); j++)
+ {
+ tx.vin[j].prevout.n = 0;
+ tx.vin[j].prevout.hash = orphans[j].GetHash();
+ }
+ // Creating signatures primes the cache:
+ boost::posix_time::ptime mst1 = boost::posix_time::microsec_clock::local_time();
+ for (unsigned int j = 0; j < tx.vin.size(); j++)
+ BOOST_CHECK(SignSignature(keystore, orphans[j], tx, j));
+ boost::posix_time::ptime mst2 = boost::posix_time::microsec_clock::local_time();
+ boost::posix_time::time_duration msdiff = mst2 - mst1;
+ long nOneValidate = msdiff.total_milliseconds();
+ if (fDebug) printf("DoS_Checksig sign: %ld\n", nOneValidate);
+
+ // ... now validating repeatedly should be quick:
+ // 2.8GHz machine, -g build: Sign takes ~760ms,
+ // uncached Verify takes ~250ms, cached Verify takes ~50ms
+ // (for 100 single-signature inputs)
+ mst1 = boost::posix_time::microsec_clock::local_time();
+ for (unsigned int i = 0; i < 5; i++)
+ for (unsigned int j = 0; j < tx.vin.size(); j++)
+ BOOST_CHECK(VerifySignature(orphans[j], tx, j, true, SIGHASH_ALL));
+ mst2 = boost::posix_time::microsec_clock::local_time();
+ msdiff = mst2 - mst1;
+ long nManyValidate = msdiff.total_milliseconds();
+ if (fDebug) printf("DoS_Checksig five: %ld\n", nManyValidate);
+
+ BOOST_CHECK_MESSAGE(nManyValidate < nOneValidate, "Signature cache timing failed");
+
+ // Empty a signature, validation should fail:
+ CScript save = tx.vin[0].scriptSig;
+ tx.vin[0].scriptSig = CScript();
+ BOOST_CHECK(!VerifySignature(orphans[0], tx, 0, true, SIGHASH_ALL));
+ tx.vin[0].scriptSig = save;
+
+ // Swap signatures, validation should fail:
+ std::swap(tx.vin[0].scriptSig, tx.vin[1].scriptSig);
+ BOOST_CHECK(!VerifySignature(orphans[0], tx, 0, true, SIGHASH_ALL));
+ BOOST_CHECK(!VerifySignature(orphans[1], tx, 1, true, SIGHASH_ALL));
+ std::swap(tx.vin[0].scriptSig, tx.vin[1].scriptSig);
+
+ // Exercise -maxsigcachesize code:
+ mapArgs["-maxsigcachesize"] = "10";
+ // Generate a new, different signature for vin[0] to trigger cache clear:
+ CScript oldSig = tx.vin[0].scriptSig;
+ BOOST_CHECK(SignSignature(keystore, orphans[0], tx, 0));
+ BOOST_CHECK(tx.vin[0].scriptSig != oldSig);
+ for (unsigned int j = 0; j < tx.vin.size(); j++)
+ BOOST_CHECK(VerifySignature(orphans[j], tx, j, true, SIGHASH_ALL));
+ mapArgs.erase("-maxsigcachesize");
+
+ LimitOrphanTxSize(0);
+}
BOOST_AUTO_TEST_SUITE_END()
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