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Abort on DTLS epoch wrap

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Manuel Pégourié-Gonnard 2014-07-11 22:31:12 +02:00 committed by Paul Bakker
parent 53aef81a7d
commit 879a4f9623
1 changed files with 48 additions and 12 deletions
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52
library/ssl_tls.c
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@ -3288,7 +3288,7 @@ void ssl_handshake_wrapup( ssl_context *ssl )
int ssl_write_finished( ssl_context *ssl )
{
int ret, hash_len, i;
int ret, hash_len;
SSL_DEBUG_MSG( 2, ( "=> write finished" ) );
@ -3337,11 +3337,29 @@ int ssl_write_finished( ssl_context *ssl )
ssl->transform_out = ssl->transform_negotiate;
ssl->session_out = ssl->session_negotiate;
memset( ssl->out_ctr + ssl_ep_len( ssl ), 0, 8 - ssl_ep_len( ssl ) );
for( i = ssl_ep_len( ssl ); i > 0; i-- )
#if defined(POLARSSL_SSL_PROTO_DTLS)
if( ssl->transport == SSL_TRANSPORT_DATAGRAM )
{
unsigned char i;
/* Set sequence_number to zero */
memset( ssl->out_ctr + 2, 0, 6 );
/* Increment epoch */
for( i = 2; i > 0; i-- )
if( ++ssl->out_ctr[i - 1] != 0 )
break;
// TODO: abort on epoch wrap!
/* The loop goes to its end iff the counter is wrapping */
if( i == 0 )
{
SSL_DEBUG_MSG( 1, ( "DTLS epoch would wrap" ) );
return( POLARSSL_ERR_SSL_COUNTER_WRAPPING );
}
}
else
#endif /* POLARSSL_SSL_PROTO_DTLS */
memset( ssl->out_ctr, 0, 8 );
#if defined(POLARSSL_SSL_HW_RECORD_ACCEL)
if( ssl_hw_record_activate != NULL )
@ -3368,7 +3386,7 @@ int ssl_write_finished( ssl_context *ssl )
int ssl_parse_finished( ssl_context *ssl )
{
int ret;
unsigned int hash_len, i;
unsigned int hash_len;
unsigned char buf[36];
SSL_DEBUG_MSG( 2, ( "=> parse finished" ) );
@ -3385,11 +3403,29 @@ int ssl_parse_finished( ssl_context *ssl )
/* Input counter/epoch not used with DTLS right now,
* but it doesn't hurt to have this part ready */
memset( ssl->in_ctr + ssl_ep_len( ssl ), 0, 8 - ssl_ep_len( ssl ) );
for( i = ssl_ep_len( ssl ); i > 0; i-- )
#if defined(POLARSSL_SSL_PROTO_DTLS)
if( ssl->transport == SSL_TRANSPORT_DATAGRAM )
{
unsigned char i;
/* Set sequence_number to zero */
memset( ssl->in_ctr + 2, 0, 6 );
/* Increment epoch */
for( i = 2; i > 0; i-- )
if( ++ssl->in_ctr[i - 1] != 0 )
break;
// TODO: abort on epoch wrap!
/* The loop goes to its end iff the counter is wrapping */
if( i == 0 )
{
SSL_DEBUG_MSG( 1, ( "DTLS epoch would wrap" ) );
return( POLARSSL_ERR_SSL_COUNTER_WRAPPING );
}
}
else
#endif /* POLARSSL_SSL_PROTO_DTLS */
memset( ssl->in_ctr, 0, 8 );
/*
* Set the in_msg pointer to the correct location based on IV length