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Add comments about 1.3 server sending no cert

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Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
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Manuel Pégourié-Gonnard 2024-08-12 10:36:40 +02:00
parent 5f9428ac8a
commit aefc5938b0
1 changed files with 6 additions and 0 deletions
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6
library/ssl_tls13_generic.c
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@ -472,6 +472,7 @@ int mbedtls_ssl_tls13_parse_certificate(mbedtls_ssl_context *ssl,
mbedtls_free(ssl->session_negotiate->peer_cert); mbedtls_free(ssl->session_negotiate->peer_cert);
} }
/* This is used by ssl_tls13_validate_certificate() */
if (certificate_list_len == 0) { if (certificate_list_len == 0) {
ssl->session_negotiate->peer_cert = NULL; ssl->session_negotiate->peer_cert = NULL;
ret = 0; ret = 0;
@ -675,6 +676,11 @@ static int ssl_tls13_validate_certificate(mbedtls_ssl_context *ssl)
#endif /* MBEDTLS_SSL_SRV_C */ #endif /* MBEDTLS_SSL_SRV_C */
#if defined(MBEDTLS_SSL_CLI_C) #if defined(MBEDTLS_SSL_CLI_C)
/* Regardless of authmode, the server is not allowed to send an empty
* certificate chain. (Last paragraph before 4.4.2.1 in RFC 8446: "The
* server's certificate_list MUST always be non-empty.") With authmode
* optional/none, we continue the handshake if we can't validate the
* server's cert, but we still break it if no certificate was sent. */
if (ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT) { if (ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT) {
MBEDTLS_SSL_PEND_FATAL_ALERT(MBEDTLS_SSL_ALERT_MSG_NO_CERT, MBEDTLS_SSL_PEND_FATAL_ALERT(MBEDTLS_SSL_ALERT_MSG_NO_CERT,
MBEDTLS_ERR_SSL_FATAL_ALERT_MESSAGE); MBEDTLS_ERR_SSL_FATAL_ALERT_MESSAGE);