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Treat an invalid record after decryption as fatal

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If a record exhibits an invalid feature only after successful
authenticated decryption, this is a protocol violation by the
peer and should hence lead to connection failure. The previous
code, however, would silently ignore such records. This commit
fixes this.

So far, the only case to which this applies is the non-acceptance
of empty non-AD records in TLS 1.2. With the present commit, such
records lead to connection failure, while previously, they were
silently ignored.

With the introduction of the Connection ID extension (or TLS 1.3),
this will also apply to records whose real content type -- which
is only revealed during authenticated decryption -- is invalid.
This commit is contained in:
Hanno Becker 2019-05-03 16:36:59 +01:00
parent 70463dbb2d
commit 16e9ae2f95
1 changed files with 1 additions and 2 deletions
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3
library/ssl_tls.c
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@ -5472,8 +5472,7 @@ static int ssl_get_next_record( mbedtls_ssl_context *ssl )
if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
{
/* Silently discard invalid records */
if( ret == MBEDTLS_ERR_SSL_INVALID_RECORD ||
ret == MBEDTLS_ERR_SSL_INVALID_MAC )
if( ret == MBEDTLS_ERR_SSL_INVALID_MAC )
{
/* Except when waiting for Finished as a bad mac here
* probably means something went wrong in the handshake