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Add dynafed proposal restrictions

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This commit is contained in:
Gregory Sanders 2019-06-17 16:34:29 -04:00
parent 37f90ba508
commit d7faffdca6
1 changed files with 34 additions and 0 deletions
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34
src/validation.cpp
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@ -3491,6 +3491,40 @@ static bool ContextualCheckDynaFedHeader(const CBlockHeader& block, CValidationS
return state.Invalid(false, REJECT_INVALID, "invalid-dyna-fed", "dynamic block header's current parameters do not match expected");
}
// Lastly, enforce rules on proposals.
const DynaFedParamEntry& proposed = dynafed_params.m_proposed;
if (!proposed.IsNull()) {
// signblockscript proposals *must* be segwit versions
int block_version = 0;
std::vector<unsigned char> block_program;
if (!proposed.m_signblockscript.IsWitnessProgram(block_version, block_program)) {
return state.Invalid(false, REJECT_INVALID, "invalid-dyna-fed", "proposed signblockscript must be native segwit scriptPubkey");
}
int fedpeg_version = 0;
std::vector<unsigned char> fedpeg_program;
if (!proposed.m_fedpegscript.IsWitnessProgram(fedpeg_version, fedpeg_program)) {
return state.Invalid(false, REJECT_INVALID, "invalid-dyna-fed", "proposed fedpegscript must be native segwit scriptPubkey");
}
// for v0, fedpegscript's scriptPubKey must match. v1+ is unencumbered.
if (fedpeg_version == 0) {
CScript computed_program = CScript() << ToByteVector(WitnessV0ScriptHash(proposed.m_fedpegscript));
if (computed_program != proposed.m_fedpeg_program) {
return state.Invalid(false, REJECT_INVALID, "invalid-dyna-fed", "proposed v0 segwit fedpegscript must match proposed fedpeg witness program");
}
// fedpegscript proposals *must not* start with OP_DEPTH
// This forbids the first Liquid watchman script which is a hack.
// Use miniscript, which doesn't even have OP_DEPTH.
// We don't encumber future segwit versions as opcodes may change.
if (!proposed.m_fedpegscript.empty() &&
proposed.m_fedpegscript.front() == OP_DEPTH) {
return state.Invalid(false, REJECT_INVALID, "invalid-dyna-fed", "Proposed fedpegscript starts with OP_DEPTH, which is illegal");
}
}
}
return true;
}