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descriptor: refuse to parse unspendable miniscript descriptors

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It's possible for some unsatisfiable miniscripts to be considered sane.
Make sure we refuse to import those, as they would be unspendable.
This commit is contained in:
Antoine Poinsot 2023-07-01 11:59:11 +02:00
parent e3280eae1b
commit 639e3b6c97
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GPG Key ID: E13FC145CD3F4304
2 changed files with 7 additions and 2 deletions
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6
src/script/descriptor.cpp
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@ -1541,14 +1541,14 @@ std::unique_ptr<DescriptorImpl> ParseScript(uint32_t& key_exp_index, Span<const
error = std::move(parser.m_key_parsing_error);
return nullptr;
}
if (!node->IsSane()) {
if (!node->IsSane() || node->IsNotSatisfiable()) {
// Try to find the first insane sub for better error reporting.
auto insane_node = node.get();
if (const auto sub = node->FindInsaneSub()) insane_node = sub;
if (const auto str = insane_node->ToString(parser)) error = *str;
if (!insane_node->IsValid()) {
error += " is invalid";
} else {
} else if (!node->IsSane()) {
error += " is not sane";
if (!insane_node->IsNonMalleable()) {
error += ": malleable witnesses exist";
@ -1561,6 +1561,8 @@ std::unique_ptr<DescriptorImpl> ParseScript(uint32_t& key_exp_index, Span<const
} else if (!insane_node->ValidSatisfactions()) {
error += ": needs witnesses that may exceed resource limits";
}
} else {
error += " is not satisfiable";
}
return nullptr;
}

3
src/script/miniscript.h
View File

@ -1161,6 +1161,9 @@ public:
return true;
}
//! Whether no satisfaction exists for this node.
bool IsNotSatisfiable() const { return !GetStackSize(); }
//! Return the expression type.
Type GetType() const { return typ; }