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zcash-patched-for-explorer
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Auto merge of #1088 - ThisIsNotOfficialCodeItsJustForks:t1078-fix-sighash-bug-2, r=ebfull 

Fix SIGHASH_SINGLE bug by removing in-band signalling.

Competes with #1079. Closes #1078.

**I FORCE PUSHED**
This commit is contained in:
zkbot 2016-07-19 23:39:06 +00:00
parent b5dfcd0fbb 838e3c753f
commit a1cded5b91
8 changed files with 37 additions and 37 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
src/main.cpp
View File

@ -999,12 +999,12 @@ bool CheckTransactionWithoutProofVerification(const CTransaction& tx, CValidatio
REJECT_INVALID, "bad-txns-prevout-null");
if (tx.vjoinsplit.size() > 0) {
// TODO: #966.
static const uint256 one(uint256S("0000000000000000000000000000000000000000000000000000000000000001"));
// Empty output script.
CScript scriptCode;
uint256 dataToBeSigned = SignatureHash(scriptCode, tx, NOT_AN_INPUT, SIGHASH_ALL);
if (dataToBeSigned == one) {
uint256 dataToBeSigned;
try {
dataToBeSigned = SignatureHash(scriptCode, tx, NOT_AN_INPUT, SIGHASH_ALL);
} catch (std::logic_error ex) {
return state.DoS(100, error("CheckTransaction(): error computing signature hash"),
REJECT_INVALID, "error-computing-signature-hash");
}

12
src/script/interpreter.cpp
View File

@ -1095,17 +1095,16 @@ public:
uint256 SignatureHash(const CScript& scriptCode, const CTransaction& txTo, unsigned int nIn, int nHashType)
{
static const uint256 one(uint256S("0000000000000000000000000000000000000000000000000000000000000001"));
if (nIn >= txTo.vin.size() && nIn != NOT_AN_INPUT) {
// nIn out of range
return one;
throw logic_error("input index is out of range");
}
// Check for invalid use of SIGHASH_SINGLE
if ((nHashType & 0x1f) == SIGHASH_SINGLE) {
if (nIn >= txTo.vout.size()) {
// nOut out of range
return one;
throw logic_error("no matching output for SIGHASH_SINGLE");
}
}
@ -1136,7 +1135,12 @@ bool TransactionSignatureChecker::CheckSig(const vector<unsigned char>& vchSigIn
int nHashType = vchSig.back();
vchSig.pop_back();
uint256 sighash = SignatureHash(scriptCode, *txTo, nIn, nHashType);
uint256 sighash;
try {
sighash = SignatureHash(scriptCode, *txTo, nIn, nHashType);
} catch (logic_error ex) {
return false;
}
if (!VerifySignature(vchSig, pubkey, sighash))
return false;

8
src/script/sign.cpp
View File

@ -25,7 +25,13 @@ bool TransactionSignatureCreator::CreateSig(std::vector<unsigned char>& vchSig,
if (!keystore->GetKey(address, key))
return false;
uint256 hash = SignatureHash(scriptCode, *txTo, nIn, nHashType);
uint256 hash;
try {
hash = SignatureHash(scriptCode, *txTo, nIn, nHashType);
} catch (logic_error ex) {
return false;
}
if (!key.Sign(hash, vchSig))
return false;
vchSig.push_back((unsigned char)nHashType);

18
src/test/data/tx_invalid.json
View File

@ -193,5 +193,23 @@
[[["0000000000000000000000000000000000000000000000000000000000000100", 0, "HASH160 0x14 0xc5b93064159b3b2d6ab506a41b1f50463771b988 EQUAL"]],
"0100000001000100000000000000000000000000000000000000000000000000000000000000000000030251b1000000000100000000000000000000000000", "P2SH,CHECKLOCKTIMEVERIFY"],
["MOVED after fixing SIGHASH_SINGLE bug. The following tests for the presence of a bug in the handling of SIGHASH_SINGLE"],
["It results in signing the constant 1, instead of something generated based on the transaction,"],
["when the input doing the signing has an index greater than the maximum output index"],
[[["0000000000000000000000000000000000000000000000000000000000000100", 0, "DUP HASH160 0x14 0xe52b482f2faa8ecbf0db344f93c84ac908557f33 EQUALVERIFY CHECKSIG"], ["0000000000000000000000000000000000000000000000000000000000000200", 0, "1"]],
"01000000020002000000000000000000000000000000000000000000000000000000000000000000000151ffffffff0001000000000000000000000000000000000000000000000000000000000000000000006b483045022100c9cdd08798a28af9d1baf44a6c77bcc7e279f47dc487c8c899911bc48feaffcc0220503c5c50ae3998a733263c5c0f7061b483e2b56c4c41b456e7d2f5a78a74c077032102d5c25adb51b61339d2b05315791e21bbe80ea470a49db0135720983c905aace0ffffffff010000000000000000015100000000", "P2SH"],
["MOVED the following two tests after fixing SIGHASH_SINGLE bug. Finally CHECKMULTISIG removes all signatures prior to hashing the script containing those signatures. In conjunction with the SIGHASH_SINGLE bug this lets us test whether or not FindAndDelete() is actually present in scriptPubKey/redeemScript evaluation by including a signature of the digest 0x01 We can compute in advance for our pubkey, embed it it in the scriptPubKey, and then also using a normal SIGHASH_ALL signature. If FindAndDelete() wasn't run, the 'bugged' signature would still be in the hashed script, and the normal signature would fail."],
["Here's an example on mainnet within a P2SH redeemScript. Remarkably it's a standard transaction in <0.9"],
[[["b5b598de91787439afd5938116654e0b16b7a0d0f82742ba37564219c5afcbf9", 0, "DUP HASH160 0x14 0xf6f365c40f0739b61de827a44751e5e99032ed8f EQUALVERIFY CHECKSIG"],
["ab9805c6d57d7070d9a42c5176e47bb705023e6b67249fb6760880548298e742", 0, "HASH160 0x14 0xd8dacdadb7462ae15cd906f1878706d0da8660e6 EQUAL"]],
"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", "P2SH"],
["Same idea, but with bare CHECKMULTISIG"],
[[["ceafe58e0f6e7d67c0409fbbf673c84c166e3c5d3c24af58f7175b18df3bb3db", 0, "DUP HASH160 0x14 0xf6f365c40f0739b61de827a44751e5e99032ed8f EQUALVERIFY CHECKSIG"],
["ceafe58e0f6e7d67c0409fbbf673c84c166e3c5d3c24af58f7175b18df3bb3db", 1, "2 0x48 0x3045022015bd0139bcccf990a6af6ec5c1c52ed8222e03a0d51c334df139968525d2fcd20221009f9efe325476eb64c3958e4713e9eefe49bf1d820ed58d2112721b134e2a1a5303 0x21 0x0378d430274f8c5ec1321338151e9f27f4c676a008bdf8638d07c0b6be9ab35c71 0x21 0x0378d430274f8c5ec1321338151e9f27f4c676a008bdf8638d07c0b6be9ab35c71 3 CHECKMULTISIG"]],
"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", "P2SH"],
["Make diffs cleaner by leaving a comment here without comma at the end"]
]

17
src/test/data/tx_valid.json
View File

@ -50,12 +50,6 @@
["b7978cc96e59a8b13e0865d3f95657561a7f725be952438637475920bac9eb21", 1, "DUP HASH160 0x14 0xbef80ecf3a44500fda1bc92176e442891662aed2 EQUALVERIFY CHECKSIG"]],
"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", "P2SH"],
["The following tests for the presence of a bug in the handling of SIGHASH_SINGLE"],
["It results in signing the constant 1, instead of something generated based on the transaction,"],
["when the input doing the signing has an index greater than the maximum output index"],
[[["0000000000000000000000000000000000000000000000000000000000000100", 0, "DUP HASH160 0x14 0xe52b482f2faa8ecbf0db344f93c84ac908557f33 EQUALVERIFY CHECKSIG"], ["0000000000000000000000000000000000000000000000000000000000000200", 0, "1"]],
"01000000020002000000000000000000000000000000000000000000000000000000000000000000000151ffffffff0001000000000000000000000000000000000000000000000000000000000000000000006b483045022100c9cdd08798a28af9d1baf44a6c77bcc7e279f47dc487c8c899911bc48feaffcc0220503c5c50ae3998a733263c5c0f7061b483e2b56c4c41b456e7d2f5a78a74c077032102d5c25adb51b61339d2b05315791e21bbe80ea470a49db0135720983c905aace0ffffffff010000000000000000015100000000", "P2SH"],
["An invalid P2SH Transaction"],
[[["0000000000000000000000000000000000000000000000000000000000000100", 0, "HASH160 0x14 0x7a052c840ba73af26755de42cf01cc9e0a49fef0 EQUAL"]],
"010000000100010000000000000000000000000000000000000000000000000000000000000000000009085768617420697320ffffffff010000000000000000015100000000", "NONE"],
@ -174,17 +168,6 @@
[[["5a6b0021a6042a686b6b94abc36b387bef9109847774e8b1e51eb8cc55c53921", 1, "DUP HASH160 0x14 0xee5a6aa40facefb2655ac23c0c28c57c65c41f9b EQUALVERIFY CHECKSIG"]],
"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", "P2SH"],
["Finally CHECKMULTISIG removes all signatures prior to hashing the script containing those signatures. In conjunction with the SIGHASH_SINGLE bug this lets us test whether or not FindAndDelete() is actually present in scriptPubKey/redeemScript evaluation by including a signature of the digest 0x01 We can compute in advance for our pubkey, embed it it in the scriptPubKey, and then also using a normal SIGHASH_ALL signature. If FindAndDelete() wasn't run, the 'bugged' signature would still be in the hashed script, and the normal signature would fail."],
["Here's an example on mainnet within a P2SH redeemScript. Remarkably it's a standard transaction in <0.9"],
[[["b5b598de91787439afd5938116654e0b16b7a0d0f82742ba37564219c5afcbf9", 0, "DUP HASH160 0x14 0xf6f365c40f0739b61de827a44751e5e99032ed8f EQUALVERIFY CHECKSIG"],
["ab9805c6d57d7070d9a42c5176e47bb705023e6b67249fb6760880548298e742", 0, "HASH160 0x14 0xd8dacdadb7462ae15cd906f1878706d0da8660e6 EQUAL"]],
"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", "P2SH"],
["Same idea, but with bare CHECKMULTISIG"],
[[["ceafe58e0f6e7d67c0409fbbf673c84c166e3c5d3c24af58f7175b18df3bb3db", 0, "DUP HASH160 0x14 0xf6f365c40f0739b61de827a44751e5e99032ed8f EQUALVERIFY CHECKSIG"],
["ceafe58e0f6e7d67c0409fbbf673c84c166e3c5d3c24af58f7175b18df3bb3db", 1, "2 0x48 0x3045022015bd0139bcccf990a6af6ec5c1c52ed8222e03a0d51c334df139968525d2fcd20221009f9efe325476eb64c3958e4713e9eefe49bf1d820ed58d2112721b134e2a1a5303 0x21 0x0378d430274f8c5ec1321338151e9f27f4c676a008bdf8638d07c0b6be9ab35c71 0x21 0x0378d430274f8c5ec1321338151e9f27f4c676a008bdf8638d07c0b6be9ab35c71 3 CHECKMULTISIG"]],
"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", "P2SH"],
["CHECKLOCKTIMEVERIFY tests"],

3
src/test/sighash_tests.cpp
View File

@ -146,13 +146,10 @@ void static RandomTransaction(CMutableTransaction &tx, bool fSingle) {
unsigned char joinSplitPrivKey[crypto_sign_SECRETKEYBYTES];
crypto_sign_keypair(tx.joinSplitPubKey.begin(), joinSplitPrivKey);
// TODO: #966.
static const uint256 one(uint256S("0000000000000000000000000000000000000000000000000000000000000001"));
// Empty output script.
CScript scriptCode;
CTransaction signTx(tx);
uint256 dataToBeSigned = SignatureHash(scriptCode, signTx, NOT_AN_INPUT, SIGHASH_ALL);
BOOST_CHECK(dataToBeSigned != one);
assert(crypto_sign_detached(&tx.joinSplitSig[0], NULL,
dataToBeSigned.begin(), 32,

3
src/test/transaction_tests.cpp
View File

@ -402,13 +402,10 @@ BOOST_AUTO_TEST_CASE(test_simple_joinsplit_invalidity)
BOOST_CHECK(!CheckTransactionWithoutProofVerification(newTx, state));
BOOST_CHECK(state.GetRejectReason() == "bad-txns-invalid-joinsplit-signature");
// TODO: #966.
static const uint256 one(uint256S("0000000000000000000000000000000000000000000000000000000000000001"));
// Empty output script.
CScript scriptCode;
CTransaction signTx(newTx);
uint256 dataToBeSigned = SignatureHash(scriptCode, signTx, NOT_AN_INPUT, SIGHASH_ALL);
BOOST_CHECK(dataToBeSigned != one);
assert(crypto_sign_detached(&newTx.joinSplitSig[0], NULL,
dataToBeSigned.begin(), 32,

5
src/wallet/rpcwallet.cpp
View File

@ -2656,15 +2656,10 @@ Value zc_raw_joinsplit(const json_spirit::Array& params, bool fHelp)
mtx.vjoinsplit.push_back(jsdesc);
// TODO: #966.
static const uint256 one(uint256S("0000000000000000000000000000000000000000000000000000000000000001"));
// Empty output script.
CScript scriptCode;
CTransaction signTx(mtx);
uint256 dataToBeSigned = SignatureHash(scriptCode, signTx, NOT_AN_INPUT, SIGHASH_ALL);
if (dataToBeSigned == one) {
throw runtime_error("SignatureHash failed");
}
// Add the signature
assert(crypto_sign_detached(&mtx.joinSplitSig[0], NULL,