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Properly check for signature_algorithms from the client in a TLS 1.3 server.

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The server was checking ssl->extensions which will always have an entry for TLSX_SIGNATURE_ALGORITHMS
as it is unconditionally added by TLSX_PopulateExtensions earlier in the DoTls13ClientHello function.
Instead, check args->clSuites->hashSigAlgoSz which is only set if signature_algorithms is found and parsed by TLSX_Parse.
This commit is contained in:
Kareem
2025-01-13 16:22:28 -07:00
parent e037e0875d
commit 9f5c89ab4b
1 changed files with 3 additions and 1 deletions
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4
src/tls13.c
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@ -7053,7 +7053,9 @@ int DoTls13ClientHello(WOLFSSL* ssl, const byte* input, word32* inOutIdx,
WOLFSSL_MSG("Client did not send a KeyShare extension");
ERROR_OUT(INCOMPLETE_DATA, exit_dch);
}
if (TLSX_Find(ssl->extensions, TLSX_SIGNATURE_ALGORITHMS) == NULL) {
/* Can't check ssl->extensions here as SigAlgs are unconditionally
set by TLSX_PopulateExtensions */
if (args->clSuites->hashSigAlgoSz == 0) {
WOLFSSL_MSG("Client did not send a SignatureAlgorithms extension");
ERROR_OUT(INCOMPLETE_DATA, exit_dch);
}