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Implement DTLS epochs

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Manuel Pégourié-Gonnard 2014-02-16 18:33:22 +01:00 committed by Paul Bakker
parent 0619348288
commit 5afb167e2c
1 changed files with 40 additions and 23 deletions
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63
library/ssl_tls.c
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@ -66,6 +66,16 @@ static void polarssl_zeroize( void *v, size_t n ) {
volatile unsigned char *p = v; while( n-- ) *p++ = 0;
}
/* Length of the "epoch" field in the record header */
static inline size_t ssl_ep_len( const ssl_context *ssl )
{
#if defined(POLARSSL_SSL_PROTO_DTLS)
if( ssl->transport == SSL_TRANSPORT_DATAGRAM )
return( 2 );
#endif
return( 0 );
}
#if defined(POLARSSL_SSL_MAX_FRAGMENT_LENGTH)
/*
* Convert max_fragment_length codes to length.
@ -1690,19 +1700,17 @@ static int ssl_decrypt_buf( ssl_context *ssl )
else
ssl->nb_zero = 0;
/* For DTLS we don't maintain our own incoming counter (for now) */
if( ssl->transport == SSL_TRANSPORT_STREAM )
{
for( i = 8; i > 0; i-- )
if( ++ssl->in_ctr[i - 1] != 0 )
break;
/* Input counter not used with DTLS right now,
* but it doesn't hurt to have this part ready */
for( i = 8; i > ssl_ep_len( ssl ); i-- )
if( ++ssl->in_ctr[i - 1] != 0 )
break;
/* The loop goes to its end iff the counter is wrapping */
if( i == 0 )
{
SSL_DEBUG_MSG( 1, ( "incoming message counter would wrap" ) );
return( POLARSSL_ERR_SSL_COUNTER_WRAPPING );
}
/* The loop goes to its end iff the counter is wrapping */
if( i == ssl_ep_len( ssl ) )
{
SSL_DEBUG_MSG( 1, ( "incoming message counter would wrap" ) );
return( POLARSSL_ERR_SSL_COUNTER_WRAPPING );
}
SSL_DEBUG_MSG( 2, ( "<= decrypt buf" ) );
@ -1851,8 +1859,8 @@ int ssl_fetch_input( ssl_context *ssl, size_t nb_want )
*/
int ssl_flush_output( ssl_context *ssl )
{
int ret, i;
unsigned char *buf;
int ret;
unsigned char *buf, i;
SSL_DEBUG_MSG( 2, ( "=> flush output" ) );
@ -1880,13 +1888,12 @@ int ssl_flush_output( ssl_context *ssl )
ssl->out_left -= ret;
}
// TODO: adapt for DTLS (start from i = 6)
for( i = 8; i > 0; i-- )
for( i = 8; i > ssl_ep_len( ssl ); i-- )
if( ++ssl->out_ctr[i - 1] != 0 )
break;
/* The loop goes to its end iff the counter is wrapping */
if( i == 0 )
if( i == ssl_ep_len( ssl ) )
{
SSL_DEBUG_MSG( 1, ( "outgoing message counter would wrap" ) );
return( POLARSSL_ERR_SSL_COUNTER_WRAPPING );
@ -3122,7 +3129,7 @@ void ssl_handshake_wrapup( ssl_context *ssl )
int ssl_write_finished( ssl_context *ssl )
{
int ret, hash_len;
int ret, hash_len, i;
SSL_DEBUG_MSG( 2, ( "=> write finished" ) );
@ -3170,8 +3177,12 @@ int ssl_write_finished( ssl_context *ssl )
SSL_DEBUG_MSG( 3, ( "switching to new transform spec for outbound data" ) );
ssl->transform_out = ssl->transform_negotiate;
ssl->session_out = ssl->session_negotiate;
// TODO: DTLS epoch?
memset( ssl->out_ctr, 0, 8 );
memset( ssl->out_ctr + ssl_ep_len( ssl ), 0, 8 - ssl_ep_len( ssl ) );
for( i = ssl_ep_len( ssl ); i > 0; i-- )
if( ++ssl->out_ctr[i - 1] != 0 )
break;
// TODO: abort on epoch wrap!
#if defined(POLARSSL_SSL_HW_RECORD_ACCEL)
if( ssl_hw_record_activate != NULL )
@ -3198,7 +3209,7 @@ int ssl_write_finished( ssl_context *ssl )
int ssl_parse_finished( ssl_context *ssl )
{
int ret;
unsigned int hash_len;
unsigned int hash_len, i;
unsigned char buf[36];
SSL_DEBUG_MSG( 2, ( "=> parse finished" ) );
@ -3212,8 +3223,14 @@ int ssl_parse_finished( ssl_context *ssl )
SSL_DEBUG_MSG( 3, ( "switching to new transform spec for inbound data" ) );
ssl->transform_in = ssl->transform_negotiate;
ssl->session_in = ssl->session_negotiate;
// TODO: DTLS epoch?
memset( ssl->in_ctr, 0, 8 );
/* 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( ++ssl->in_ctr[i - 1] != 0 )
break;
// TODO: abort on epoch wrap!
/*
* Set the in_msg pointer to the correct location based on IV length