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Expain rationale for handling of consecutive empty AD records

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This commit is contained in:
Hanno Becker 2019-05-08 10:38:32 +01:00
parent 76a79ab4a2
commit 6e7700df17
1 changed files with 4 additions and 2 deletions
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6
library/ssl_tls.c
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@ -5081,8 +5081,10 @@ static int ssl_prepare_record_content( mbedtls_ssl_context *ssl )
if( ssl->nb_zero > 3 ) if( ssl->nb_zero > 3 )
{ {
MBEDTLS_SSL_DEBUG_MSG( 1, ( "received four consecutive empty " MBEDTLS_SSL_DEBUG_MSG( 1, ( "received four consecutive empty "
"messages, possible DoS attack" ) ); "messages, possible DoS attack" ) );
/* Q: Is that the right error code? */ /* Treat the records as if they were not properly authenticated,
* thereby failing the connection if we see more than allowed
* by the configured bad MAC threshold. */
return( MBEDTLS_ERR_SSL_INVALID_MAC ); return( MBEDTLS_ERR_SSL_INVALID_MAC );
} }
} }