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Fix epoch swapping

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Manuel Pégourié-Gonnard 2014-09-19 21:39:13 +02:00 committed by Paul Bakker
parent 6a2bdfaf73
commit c715aed744
1 changed files with 32 additions and 8 deletions
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40
library/ssl_tls.c
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@ -2113,13 +2113,36 @@ static void ssl_swap_epochs( ssl_context *ssl )
SSL_DEBUG_MSG( 3, ( "swap epochs" ) ); SSL_DEBUG_MSG( 3, ( "swap epochs" ) );
/* Swap transforms */
tmp_transform = ssl->transform_out; tmp_transform = ssl->transform_out;
ssl->transform_out = ssl->handshake->alt_transform_out; ssl->transform_out = ssl->handshake->alt_transform_out;
ssl->handshake->alt_transform_out = tmp_transform; ssl->handshake->alt_transform_out = tmp_transform;
/* Swap epoch + sequence_number */
memcpy( tmp_out_ctr, ssl->out_ctr, 8 ); memcpy( tmp_out_ctr, ssl->out_ctr, 8 );
memcpy( ssl->out_ctr, ssl->handshake->alt_out_ctr, 8 ); memcpy( ssl->out_ctr, ssl->handshake->alt_out_ctr, 8 );
memcpy( ssl->handshake->alt_out_ctr, tmp_out_ctr, 8 ); memcpy( ssl->handshake->alt_out_ctr, tmp_out_ctr, 8 );
/* Adjust to the newly activated transform */
if( ssl->transform_out != NULL &&
ssl->minor_ver >= SSL_MINOR_VERSION_2 )
{
ssl->out_msg = ssl->out_iv + ssl->transform_out->ivlen -
ssl->transform_out->fixed_ivlen;
}
else
ssl->out_msg = ssl->out_iv;
#if defined(POLARSSL_SSL_HW_RECORD_ACCEL)
if( ssl_hw_record_activate != NULL )
{
if( ( ret = ssl_hw_record_activate( ssl, SSL_CHANNEL_OUTBOUND ) ) != 0 )
{
SSL_DEBUG_RET( 1, "ssl_hw_record_activate", ret );
return( POLARSSL_ERR_SSL_HW_ACCEL_FAILED );
}
}
#endif
} }
/* /*
@ -2148,6 +2171,15 @@ int ssl_resend( ssl_context *ssl )
int ret; int ret;
ssl_flight_item *cur = ssl->handshake->cur_msg; ssl_flight_item *cur = ssl->handshake->cur_msg;
/* Swap epochs before sending Finished: we can't do it after
* sending ChangeCipherSpec, in case write returns WANT_READ.
* Must be done before copying, may change out_msg pointer */
if( cur->type == SSL_MSG_HANDSHAKE &&
cur->p[0] == SSL_HS_FINISHED )
{
ssl_swap_epochs( ssl );
}
memcpy( ssl->out_msg, cur->p, cur->len ); memcpy( ssl->out_msg, cur->p, cur->len );
ssl->out_msglen = cur->len; ssl->out_msglen = cur->len;
ssl->out_msgtype = cur->type; ssl->out_msgtype = cur->type;
@ -2156,14 +2188,6 @@ int ssl_resend( ssl_context *ssl )
SSL_DEBUG_BUF( 3, "resent handshake message header", ssl->out_msg, 12 ); SSL_DEBUG_BUF( 3, "resent handshake message header", ssl->out_msg, 12 );
/* Swap epochs before sending Finished: we can't do it right after
* sending ChangeCipherSpec, in case write returns WANT_READ */
if( ssl->out_msgtype == SSL_MSG_HANDSHAKE &&
ssl->out_msg[0] == SSL_HS_FINISHED )
{
ssl_swap_epochs( ssl );
}
if( ( ret = ssl_write_record( ssl ) ) != 0 ) if( ( ret = ssl_write_record( ssl ) ) != 0 )
{ {
SSL_DEBUG_RET( 1, "ssl_write_record", ret ); SSL_DEBUG_RET( 1, "ssl_write_record", ret );