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Quantum: Model missing OpenSSL EVP digest consumers #19545

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Merged
nicolaswill merged 3 commits into from
May 21, 2025
Merged

Quantum: Model missing OpenSSL EVP digest consumers #19545

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d35fc64
Crypto: Missing openssl EVP digest consumers.
bdrodes May 20, 2025
9f65cb8
Comment/doc cleanup
bdrodes May 21, 2025
acb1962
Merge branch 'main' into missing_openssl_hash_algorithm_consumers
nicolaswill May 21, 2025
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1 change: 0 additions & 1 deletion ...lib/experimental/quantum/OpenSSL/AlgorithmValueConsumers/DirectAlgorithmValueConsumer.qll
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Original file line number Diff line number Diff line change
Expand Up @@ -3,7 +3,6 @@ private import experimental.quantum.Language
private import experimental.quantum.OpenSSL.AlgorithmInstances.KnownAlgorithmConstants
private import experimental.quantum.OpenSSL.AlgorithmValueConsumers.OpenSSLAlgorithmValueConsumerBase

// TODO: can self referential to itself, which is also an algorithm (Known algorithm)
/**
* Cases like EVP_MD5(),
* there is no input, rather it directly gets an algorithm
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31 changes: 31 additions & 0 deletions ...l/lib/experimental/quantum/OpenSSL/AlgorithmValueConsumers/HashAlgorithmValueConsumer.qll
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Expand Up @@ -30,3 +30,34 @@
none()
}
}

/**
* The EVP digest algorithm getters
* https://docs.openssl.org/3.0/man3/EVP_DigestInit/#synopsis
*/
class EVPDigestAlgorithmValueConsumer extends OpenSSLAlgorithmValueConsumer {

Check warning

Code scanning / CodeQL

Acronyms should be PascalCase/camelCase. Warning

Acronyms in EVPDigestAlgorithmValueConsumer should be PascalCase/camelCase.
DataFlow::Node valueArgNode;
DataFlow::Node resultNode;

EVPDigestAlgorithmValueConsumer() {
resultNode.asExpr() = this and
isPossibleOpenSSLFunction(this.(Call).getTarget()) and
(
this.(Call).getTarget().getName() in [
"EVP_get_digestbyname", "EVP_get_digestbynid", "EVP_get_digestbyobj"
] and
valueArgNode.asExpr() = this.(Call).getArgument(0)
or
this.(Call).getTarget().getName() = "EVP_MD_fetch" and
valueArgNode.asExpr() = this.(Call).getArgument(1)
)
}

override DataFlow::Node getResultNode() { result = resultNode }

override Crypto::ConsumerInputDataFlowNode getInputNode() { result = valueArgNode }

override Crypto::AlgorithmInstance getAKnownAlgorithmSource() {
exists(OpenSSLAlgorithmInstance i | i.getAVC() = this and result = i)
}
}