aboutsummaryrefslogtreecommitdiff
path: root/src/test/DoS_tests.cpp
blob: 4ee2e948343b3ea82a2cd2da180bee5da5d1f431 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
//
// 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 "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;

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(ip(0xa0b0c001));
    CNode dummyNode1(INVALID_SOCKET, addr1, true);
    dummyNode1.Misbehaving(100); // Should get banned
    BOOST_CHECK(CNode::IsBanned(addr1));
    BOOST_CHECK(!CNode::IsBanned(ip(0xa0b0c001|0x0000ff00))); // Different ip, not banned

    CAddress addr2(ip(0xa0b0c002));
    CNode dummyNode2(INVALID_SOCKET, addr2, true);
    dummyNode2.Misbehaving(50);
    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));
}    

BOOST_AUTO_TEST_CASE(DoS_banscore)
{
    CNode::ClearBanned();
    mapArgs["-banscore"] = "111"; // because 11 is my favorite number
    CAddress addr1(ip(0xa0b0c001));
    CNode dummyNode1(INVALID_SOCKET, addr1, true);
    dummyNode1.Misbehaving(100);
    BOOST_CHECK(!CNode::IsBanned(addr1));
    dummyNode1.Misbehaving(10);
    BOOST_CHECK(!CNode::IsBanned(addr1));
    dummyNode1.Misbehaving(1);
    BOOST_CHECK(CNode::IsBanned(addr1));
    mapArgs.erase("-banscore");
}

BOOST_AUTO_TEST_CASE(DoS_bantime)
{
    CNode::ClearBanned();
    int64 nStartTime = GetTime();
    SetMockTime(nStartTime); // Overrides future calls to GetTime()

    CAddress addr(ip(0xa0b0c001));
    CNode dummyNode(INVALID_SOCKET, addr, true);

    dummyNode.Misbehaving(100);
    BOOST_CHECK(CNode::IsBanned(addr));

    SetMockTime(nStartTime+60*60);
    BOOST_CHECK(CNode::IsBanned(addr));

    SetMockTime(nStartTime+60*60*24+1);
    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.SetBitcoinAddress(key.GetPubKey());

        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.SetBitcoinAddress(key.GetPubKey());
        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.SetBitcoinAddress(key.GetPubKey());
        tx.vin.resize(500);
        for (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 (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.SetBitcoinAddress(key.GetPubKey());

        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.SetBitcoinAddress(key.GetPubKey());
    tx.vin.resize(NPREV);
    for (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 (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 (int i = 0; i < 5; i++)
        for (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 (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()