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reject extensions in a TLS 1.3 Certificate message that were not offered in the prior ClientHello/CertificateRequest #10338

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reject extensions in a TLS 1.3 Certificate message that were not offered in the prior ClientHello/CertificateRequest #10338

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14 changes: 14 additions & 0 deletions src/tls.c
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Original file line number Diff line number Diff line change
Expand Up @@ -17387,6 +17387,20 @@ int TLSX_Parse(WOLFSSL* ssl, const byte* input, word16 length, byte msgType,
break;
}

#ifdef WOLFSSL_TLS13
/* RFC 8446 4.4.2: extensions in a Certificate message MUST
* correspond to ones offered in our prior ClientHello (client) or
* CertificateRequest (server). Reject anything we did not offer. */
if (msgType == certificate &&
IsAtLeastTLSv1_3(ssl->version) &&
TLSX_Find(ssl->extensions, (TLSX_Type)type) == NULL) {
WOLFSSL_MSG("Cert-msg extension not offered in CH/CR");
SendAlert(ssl, alert_fatal, unsupported_extension);
WOLFSSL_ERROR_VERBOSE(UNSUPPORTED_EXTENSION);
return UNSUPPORTED_EXTENSION;
}
#endif

switch (type) {
#ifdef HAVE_SNI
case TLSX_SERVER_NAME:
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