Update standardness rules congruent to Bitcoin Core #2178
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Nice PR, there're a few lingering policy rules bitcoind applies that we don't, so nice to be able to periodically bridge the gap. Hopefully one day this'll all be in a nice BIP to make it easier to track relevant policy that full node implementations should consider.
Left a few comments in line
| @@ -589,6 +596,12 @@ func (msg *MsgTx) btcDecode(r io.Reader, pver uint32, enc MessageEncoding, | |||
| sbuf = sbuf[len(txin.Witness[j]):] | |||
| } | |||
| } | |||
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| // Check that if the witness flag is set that we actually have | |||
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Nice, this is something that is actually spelled out in the old BIP (144):
If the witness is empty, the old serialization format must be used.
https://github.com/bitcoin/bips/blob/master/bip-0144.mediawiki
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| // ScriptVerifyConstScriptCode fails non-segwit scripts if a signature | ||
| // match is found in the script code or if OP_CODESEPARATOR is used. | ||
| ScriptVerifyConstScriptCode |
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+1 for aligning here, this wasn't in the original set of BIPs, but was added afterwards: https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2017-November/015292.html
Being closer to bitcoind here policy wise may make it easier to keep up with w/e the outcome of the Great Consensus Cleanup Revival is.
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This is to mitigate CVE-2017-12842. Along the way, also error when deserializing transactions that have the witness marker flag set but have no witnesses. This matches Bitcoin Core's behaviour initially introduced here bitcoin/bitcoin#14039. Allowing such transactions is benign, but this makes sure that our parsing code matches Core's exactly.
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This PR updates a couple of relay policy rules to bring them in line with what Bitcoin Core does. We do two things here,
References: