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// Copyright (c) 2011-2016 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
// Unit tests for denial-of-service detection/prevention code
#include "chainparams.h"
#include "keystore.h"
#include "net.h"
#include "net_processing.h"
#include "pow.h"
#include "script/sign.h"
#include "serialize.h"
#include "util.h"
#include "validation.h"
#include "test/test_bitcoin.h"
#include <stdint.h>
#include <boost/test/unit_test.hpp>
// Tests these internal-to-net_processing.cpp methods:
extern bool AddOrphanTx(const CTransactionRef& tx, NodeId peer);
extern void EraseOrphansFor(NodeId peer);
extern unsigned int LimitOrphanTxSize(unsigned int nMaxOrphans);
struct COrphanTx {
CTransactionRef tx;
NodeId fromPeer;
int64_t nTimeExpire;
};
extern std::map<uint256, COrphanTx> mapOrphanTransactions;
CService ip(uint32_t i)
{
struct in_addr s;
s.s_addr = i;
return CService(CNetAddr(s), Params().GetDefaultPort());
}
static NodeId id = 0;
BOOST_FIXTURE_TEST_SUITE(DoS_tests, TestingSetup)
BOOST_AUTO_TEST_CASE(DoS_banning)
{
std::atomic<bool> interruptDummy(false);
connman->ClearBanned();
CAddress addr1(ip(0xa0b0c001), NODE_NONE);
CNode dummyNode1(id++, NODE_NETWORK, 0, INVALID_SOCKET, addr1, 0, 0, CAddress(), "", true);
dummyNode1.SetSendVersion(PROTOCOL_VERSION);
GetNodeSignals().InitializeNode(&dummyNode1, connman);
dummyNode1.nVersion = 1;
dummyNode1.fSuccessfullyConnected = true;
Misbehaving(dummyNode1.GetId(), 100); // Should get banned
SendMessages(&dummyNode1, connman, interruptDummy);
BOOST_CHECK(connman->IsBanned(addr1));
BOOST_CHECK(!connman->IsBanned(ip(0xa0b0c001|0x0000ff00))); // Different IP, not banned
CAddress addr2(ip(0xa0b0c002), NODE_NONE);
CNode dummyNode2(id++, NODE_NETWORK, 0, INVALID_SOCKET, addr2, 1, 1, CAddress(), "", true);
dummyNode2.SetSendVersion(PROTOCOL_VERSION);
GetNodeSignals().InitializeNode(&dummyNode2, connman);
dummyNode2.nVersion = 1;
dummyNode2.fSuccessfullyConnected = true;
Misbehaving(dummyNode2.GetId(), 50);
SendMessages(&dummyNode2, connman, interruptDummy);
BOOST_CHECK(!connman->IsBanned(addr2)); // 2 not banned yet...
BOOST_CHECK(connman->IsBanned(addr1)); // ... but 1 still should be
Misbehaving(dummyNode2.GetId(), 50);
SendMessages(&dummyNode2, connman, interruptDummy);
BOOST_CHECK(connman->IsBanned(addr2));
}
BOOST_AUTO_TEST_CASE(DoS_banscore)
{
std::atomic<bool> interruptDummy(false);
connman->ClearBanned();
gArgs.ForceSetArg("-banscore", "111"); // because 11 is my favorite number
CAddress addr1(ip(0xa0b0c001), NODE_NONE);
CNode dummyNode1(id++, NODE_NETWORK, 0, INVALID_SOCKET, addr1, 3, 1, CAddress(), "", true);
dummyNode1.SetSendVersion(PROTOCOL_VERSION);
GetNodeSignals().InitializeNode(&dummyNode1, connman);
dummyNode1.nVersion = 1;
dummyNode1.fSuccessfullyConnected = true;
Misbehaving(dummyNode1.GetId(), 100);
SendMessages(&dummyNode1, connman, interruptDummy);
BOOST_CHECK(!connman->IsBanned(addr1));
Misbehaving(dummyNode1.GetId(), 10);
SendMessages(&dummyNode1, connman, interruptDummy);
BOOST_CHECK(!connman->IsBanned(addr1));
Misbehaving(dummyNode1.GetId(), 1);
SendMessages(&dummyNode1, connman, interruptDummy);
BOOST_CHECK(connman->IsBanned(addr1));
gArgs.ForceSetArg("-banscore", std::to_string(DEFAULT_BANSCORE_THRESHOLD));
}
BOOST_AUTO_TEST_CASE(DoS_bantime)
{
std::atomic<bool> interruptDummy(false);
connman->ClearBanned();
int64_t nStartTime = GetTime();
SetMockTime(nStartTime); // Overrides future calls to GetTime()
CAddress addr(ip(0xa0b0c001), NODE_NONE);
CNode dummyNode(id++, NODE_NETWORK, 0, INVALID_SOCKET, addr, 4, 4, CAddress(), "", true);
dummyNode.SetSendVersion(PROTOCOL_VERSION);
GetNodeSignals().InitializeNode(&dummyNode, connman);
dummyNode.nVersion = 1;
dummyNode.fSuccessfullyConnected = true;
Misbehaving(dummyNode.GetId(), 100);
SendMessages(&dummyNode, connman, interruptDummy);
BOOST_CHECK(connman->IsBanned(addr));
SetMockTime(nStartTime+60*60);
BOOST_CHECK(connman->IsBanned(addr));
SetMockTime(nStartTime+60*60*24+1);
BOOST_CHECK(!connman->IsBanned(addr));
}
CTransactionRef RandomOrphan()
{
std::map<uint256, COrphanTx>::iterator it;
it = mapOrphanTransactions.lower_bound(InsecureRand256());
if (it == mapOrphanTransactions.end())
it = mapOrphanTransactions.begin();
return it->second.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++)
{
CMutableTransaction tx;
tx.vin.resize(1);
tx.vin[0].prevout.n = 0;
tx.vin[0].prevout.hash = InsecureRand256();
tx.vin[0].scriptSig << OP_1;
tx.vout.resize(1);
tx.vout[0].nValue = 1*CENT;
tx.vout[0].scriptPubKey = GetScriptForDestination(key.GetPubKey().GetID());
AddOrphanTx(MakeTransactionRef(tx), i);
}
// ... and 50 that depend on other orphans:
for (int i = 0; i < 50; i++)
{
CTransactionRef txPrev = RandomOrphan();
CMutableTransaction 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 = GetScriptForDestination(key.GetPubKey().GetID());
SignSignature(keystore, *txPrev, tx, 0, SIGHASH_ALL);
AddOrphanTx(MakeTransactionRef(tx), i);
}
// This really-big orphan should be ignored:
for (int i = 0; i < 10; i++)
{
CTransactionRef txPrev = RandomOrphan();
CMutableTransaction tx;
tx.vout.resize(1);
tx.vout[0].nValue = 1*CENT;
tx.vout[0].scriptPubKey = GetScriptForDestination(key.GetPubKey().GetID());
tx.vin.resize(2777);
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, SIGHASH_ALL);
// 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;
BOOST_CHECK(!AddOrphanTx(MakeTransactionRef(tx), i));
}
// Test EraseOrphansFor:
for (NodeId i = 0; i < 3; i++)
{
size_t sizeBefore = mapOrphanTransactions.size();
EraseOrphansFor(i);
BOOST_CHECK(mapOrphanTransactions.size() < sizeBefore);
}
// Test LimitOrphanTxSize() function:
LimitOrphanTxSize(40);
BOOST_CHECK(mapOrphanTransactions.size() <= 40);
LimitOrphanTxSize(10);
BOOST_CHECK(mapOrphanTransactions.size() <= 10);
LimitOrphanTxSize(0);
BOOST_CHECK(mapOrphanTransactions.empty());
}
BOOST_AUTO_TEST_SUITE_END()
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