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1 : : // Copyright (c) 2020-2022 The Bitcoin Core developers
2 : : // Distributed under the MIT software license, see the accompanying
3 : : // file COPYING or http://www.opensource.org/licenses/mit-license.php.
4 : :
5 : : #include <test/fuzz/fuzz.h>
6 : :
7 : : #include <primitives/transaction.h>
8 : : #include <pubkey.h>
9 : : #include <script/interpreter.h>
10 : : #include <serialize.h>
11 : : #include <streams.h>
12 : : #include <univalue.h>
13 : : #include <util/strencodings.h>
14 : : #include <util/string.h>
15 : :
16 : : #include <cstdint>
17 : : #include <string>
18 : : #include <vector>
19 : :
20 : : // This fuzz "test" can be used to minimize test cases for script_assets_test in
21 : : // src/test/script_tests.cpp. While it written as a fuzz test, and can be used as such,
22 : : // fuzzing the inputs is unlikely to construct useful test cases.
23 : : //
24 : : // Instead, it is primarily intended to be run on a test set that was generated
25 : : // externally, for example using test/functional/feature_taproot.py's --dumptests mode.
26 : : // The minimized set can then be concatenated together, surrounded by '[' and ']',
27 : : // and used as the script_assets_test.json input to the script_assets_test unit test:
28 : : //
29 : : // (normal build)
30 : : // $ mkdir dump
31 : : // $ for N in $(seq 1 10); do TEST_DUMP_DIR=dump test/functional/feature_taproot.py --dumptests; done
32 : : // $ ...
33 : : //
34 : : // (libFuzzer build)
35 : : // $ mkdir dump-min
36 : : // $ FUZZ=script_assets_test_minimizer ./src/test/fuzz/fuzz -merge=1 -use_value_profile=1 dump-min/ dump/
37 : : // $ (echo -en '[\n'; cat dump-min/* | head -c -2; echo -en '\n]') >script_assets_test.json
38 : :
39 : : namespace {
40 : :
41 : 0 : std::vector<unsigned char> CheckedParseHex(const std::string& str)
42 : : {
43 [ # # # # : 0 : if (str.size() && !IsHex(str)) throw std::runtime_error("Non-hex input '" + str + "'");
# # # # #
# # # #
# ]
44 : 0 : return ParseHex(str);
45 : 0 : }
46 : :
47 : 0 : CScript ScriptFromHex(const std::string& str)
48 : : {
49 : 0 : std::vector<unsigned char> data = CheckedParseHex(str);
50 [ # # ]: 0 : return CScript(data.begin(), data.end());
51 : 0 : }
52 : :
53 : 0 : CMutableTransaction TxFromHex(const std::string& str)
54 : : {
55 : 0 : CMutableTransaction tx;
56 : : try {
57 [ # # # # : 0 : SpanReader{SERIALIZE_TRANSACTION_NO_WITNESS, CheckedParseHex(str)} >> tx;
# # # # ]
58 [ # # ]: 0 : } catch (const std::ios_base::failure&) {
59 [ # # # # ]: 0 : throw std::runtime_error("Tx deserialization failure");
60 [ # # ]: 0 : }
61 : 0 : return tx;
62 : 0 : }
63 : :
64 : 0 : std::vector<CTxOut> TxOutsFromJSON(const UniValue& univalue)
65 : : {
66 [ # # # # ]: 0 : if (!univalue.isArray()) throw std::runtime_error("Prevouts must be array");
67 : 0 : std::vector<CTxOut> prevouts;
68 [ # # # # ]: 0 : for (size_t i = 0; i < univalue.size(); ++i) {
69 [ # # ]: 0 : CTxOut txout;
70 : : try {
71 [ # # # # : 0 : SpanReader{0, CheckedParseHex(univalue[i].get_str())} >> txout;
# # # # #
# # # ]
72 [ # # ]: 0 : } catch (const std::ios_base::failure&) {
73 [ # # # # ]: 0 : throw std::runtime_error("Prevout invalid format");
74 [ # # ]: 0 : }
75 [ # # ]: 0 : prevouts.push_back(std::move(txout));
76 : 0 : }
77 : 0 : return prevouts;
78 [ # # ]: 0 : }
79 : :
80 : 0 : CScriptWitness ScriptWitnessFromJSON(const UniValue& univalue)
81 : : {
82 [ # # # # ]: 0 : if (!univalue.isArray()) throw std::runtime_error("Script witness is not array");
83 : 0 : CScriptWitness scriptwitness;
84 [ # # ]: 0 : for (size_t i = 0; i < univalue.size(); ++i) {
85 [ # # # # : 0 : auto bytes = CheckedParseHex(univalue[i].get_str());
# # ]
86 [ # # ]: 0 : scriptwitness.stack.push_back(std::move(bytes));
87 : 0 : }
88 : 0 : return scriptwitness;
89 [ # # ]: 0 : }
90 : :
91 [ + - # # ]: 16 : const std::map<std::string, unsigned int> FLAG_NAMES = {
92 [ + - + - ]: 2 : {std::string("P2SH"), (unsigned int)SCRIPT_VERIFY_P2SH},
93 [ + - + - ]: 2 : {std::string("DERSIG"), (unsigned int)SCRIPT_VERIFY_DERSIG},
94 [ + - + - ]: 2 : {std::string("NULLDUMMY"), (unsigned int)SCRIPT_VERIFY_NULLDUMMY},
95 [ + - + - ]: 2 : {std::string("CHECKLOCKTIMEVERIFY"), (unsigned int)SCRIPT_VERIFY_CHECKLOCKTIMEVERIFY},
96 [ + - + - ]: 2 : {std::string("CHECKSEQUENCEVERIFY"), (unsigned int)SCRIPT_VERIFY_CHECKSEQUENCEVERIFY},
97 [ + - + - ]: 2 : {std::string("WITNESS"), (unsigned int)SCRIPT_VERIFY_WITNESS},
98 [ + - + - ]: 2 : {std::string("TAPROOT"), (unsigned int)SCRIPT_VERIFY_TAPROOT},
99 : : };
100 : :
101 : 2 : std::vector<unsigned int> AllFlags()
102 : : {
103 : 2 : std::vector<unsigned int> ret;
104 : :
105 [ + + ]: 258 : for (unsigned int i = 0; i < 128; ++i) {
106 : 256 : unsigned int flag = 0;
107 [ + + ]: 256 : if (i & 1) flag |= SCRIPT_VERIFY_P2SH;
108 [ + + ]: 256 : if (i & 2) flag |= SCRIPT_VERIFY_DERSIG;
109 [ + + ]: 256 : if (i & 4) flag |= SCRIPT_VERIFY_NULLDUMMY;
110 [ + + ]: 256 : if (i & 8) flag |= SCRIPT_VERIFY_CHECKLOCKTIMEVERIFY;
111 [ + + ]: 256 : if (i & 16) flag |= SCRIPT_VERIFY_CHECKSEQUENCEVERIFY;
112 [ + + ]: 256 : if (i & 32) flag |= SCRIPT_VERIFY_WITNESS;
113 [ + + ]: 256 : if (i & 64) flag |= SCRIPT_VERIFY_TAPROOT;
114 : :
115 : : // SCRIPT_VERIFY_WITNESS requires SCRIPT_VERIFY_P2SH
116 [ + + + + ]: 256 : if (flag & SCRIPT_VERIFY_WITNESS && !(flag & SCRIPT_VERIFY_P2SH)) continue;
117 : : // SCRIPT_VERIFY_TAPROOT requires SCRIPT_VERIFY_WITNESS
118 [ + + + + ]: 192 : if (flag & SCRIPT_VERIFY_TAPROOT && !(flag & SCRIPT_VERIFY_WITNESS)) continue;
119 : :
120 [ + - ]: 128 : ret.push_back(flag);
121 : 128 : }
122 : :
123 : 2 : return ret;
124 [ + - ]: 2 : }
125 : :
126 : 2 : const std::vector<unsigned int> ALL_FLAGS = AllFlags();
127 : :
128 : 0 : unsigned int ParseScriptFlags(const std::string& str)
129 : : {
130 [ # # ]: 0 : if (str.empty()) return 0;
131 : :
132 : 0 : unsigned int flags = 0;
133 : 0 : std::vector<std::string> words = SplitString(str, ',');
134 : :
135 [ # # ]: 0 : for (const std::string& word : words) {
136 [ # # ]: 0 : auto it = FLAG_NAMES.find(word);
137 [ # # # # : 0 : if (it == FLAG_NAMES.end()) throw std::runtime_error("Unknown verification flag " + word);
# # # # #
# ]
138 : 0 : flags |= it->second;
139 : : }
140 : :
141 : 0 : return flags;
142 : 0 : }
143 : :
144 : 0 : void Test(const std::string& str)
145 : : {
146 : 0 : UniValue test;
147 [ # # # # : 0 : if (!test.read(str) || !test.isObject()) throw std::runtime_error("Non-object test input");
# # # # ]
148 : :
149 [ # # # # : 0 : CMutableTransaction tx = TxFromHex(test["tx"].get_str());
# # # # ]
150 [ # # # # : 0 : const std::vector<CTxOut> prevouts = TxOutsFromJSON(test["prevouts"]);
# # ]
151 [ # # # # ]: 0 : if (prevouts.size() != tx.vin.size()) throw std::runtime_error("Incorrect number of prevouts");
152 [ # # # # : 0 : size_t idx = test["index"].getInt<int64_t>();
# # ]
153 [ # # # # ]: 0 : if (idx >= tx.vin.size()) throw std::runtime_error("Invalid index");
154 [ # # # # : 0 : unsigned int test_flags = ParseScriptFlags(test["flags"].get_str());
# # # # ]
155 [ # # # # : 0 : bool final = test.exists("final") && test["final"].get_bool();
# # # # #
# # # # #
# # # # #
# ]
156 : :
157 [ # # # # : 0 : if (test.exists("success")) {
# # ]
158 [ # # # # : 0 : tx.vin[idx].scriptSig = ScriptFromHex(test["success"]["scriptSig"].get_str());
# # # # #
# # # ]
159 [ # # # # : 0 : tx.vin[idx].scriptWitness = ScriptWitnessFromJSON(test["success"]["witness"]);
# # # # #
# ]
160 [ # # ]: 0 : PrecomputedTransactionData txdata;
161 [ # # # # ]: 0 : txdata.Init(tx, std::vector<CTxOut>(prevouts));
162 [ # # ]: 0 : MutableTransactionSignatureChecker txcheck(&tx, idx, prevouts[idx].nValue, txdata, MissingDataBehavior::ASSERT_FAIL);
163 [ # # ]: 0 : for (const auto flags : ALL_FLAGS) {
164 : : // "final": true tests are valid for all flags. Others are only valid with flags that are
165 : : // a subset of test_flags.
166 [ # # # # ]: 0 : if (final || ((flags & test_flags) == flags)) {
167 [ # # ]: 0 : (void)VerifyScript(tx.vin[idx].scriptSig, prevouts[idx].scriptPubKey, &tx.vin[idx].scriptWitness, flags, txcheck, nullptr);
168 : 0 : }
169 : : }
170 : 0 : }
171 : :
172 [ # # # # : 0 : if (test.exists("failure")) {
# # ]
173 [ # # # # : 0 : tx.vin[idx].scriptSig = ScriptFromHex(test["failure"]["scriptSig"].get_str());
# # # # #
# # # ]
174 [ # # # # : 0 : tx.vin[idx].scriptWitness = ScriptWitnessFromJSON(test["failure"]["witness"]);
# # # # #
# ]
175 [ # # ]: 0 : PrecomputedTransactionData txdata;
176 [ # # # # ]: 0 : txdata.Init(tx, std::vector<CTxOut>(prevouts));
177 [ # # ]: 0 : MutableTransactionSignatureChecker txcheck(&tx, idx, prevouts[idx].nValue, txdata, MissingDataBehavior::ASSERT_FAIL);
178 [ # # ]: 0 : for (const auto flags : ALL_FLAGS) {
179 : : // If a test is supposed to fail with test_flags, it should also fail with any superset thereof.
180 [ # # ]: 0 : if ((flags & test_flags) == test_flags) {
181 [ # # ]: 0 : (void)VerifyScript(tx.vin[idx].scriptSig, prevouts[idx].scriptPubKey, &tx.vin[idx].scriptWitness, flags, txcheck, nullptr);
182 : 0 : }
183 : : }
184 : 0 : }
185 : 0 : }
186 : :
187 : 0 : void test_init() {}
188 : :
189 [ + - - + ]: 4 : FUZZ_TARGET(script_assets_test_minimizer, .init = test_init, .hidden = true)
190 : : {
191 [ # # # # : 0 : if (buffer.size() < 2 || buffer.back() != '\n' || buffer[buffer.size() - 2] != ',') return;
# # ]
192 [ # # ]: 0 : const std::string str((const char*)buffer.data(), buffer.size() - 2);
193 : : try {
194 [ # # ]: 0 : Test(str);
195 [ # # ]: 0 : } catch (const std::runtime_error&) {
196 [ # # ]: 0 : }
197 : 0 : }
198 : :
199 : : } // namespace
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