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Fix computation of minlen for encrypted packets

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Manuel Pégourié-Gonnard 2014-06-18 16:06:02 +02:00 committed by Paul Bakker
parent e800cd81d7
commit eaa76f7e20
2 changed files with 37 additions and 7 deletions
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3
ChangeLog
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@ -34,6 +34,9 @@ Bugfix
* Fix symlink command for cross compiling with CMake (found by Andre
Heinecke)
* Fix DER output of gen_key app (found by Gergely Budai)
* Very small packets were incorrectly rejected when truncated HMAC was in
use with some ciphersuites and versions (RC4 in all versions, CBC with
versions < TLS 1.1).
= PolarSSL 1.3.7 released on 2014-05-02
Features

39
library/ssl_tls.c
View File

@ -521,7 +521,10 @@ int ssl_derive_keys( ssl_context *ssl )
transform->ivlen = 12;
transform->fixed_ivlen = 4;
transform->minlen = 1; // FIXME
/* Minimum length is expicit IV + tag */
transform->minlen = transform->ivlen - transform->fixed_ivlen
+ ( transform->ciphersuite_info->flags &
POLARSSL_CIPHERSUITE_SHORT_TAG ? 8 : 16 );
}
else
{
@ -551,14 +554,38 @@ int ssl_derive_keys( ssl_context *ssl )
/* IV length */
transform->ivlen = cipher_info->iv_size;
/* Minimum length: FIXME */
transform->minlen = transform->keylen;
if( transform->minlen < transform->maclen )
{
/* Minimum length */
if( cipher_info->mode == POLARSSL_MODE_STREAM )
transform->minlen = transform->maclen;
else
transform->minlen += transform->keylen;
{
/*
* GenericBlockCipher:
* first multiple of blocklen greater than maclen
* + IV except for SSL3 and TLS 1.0
*/
transform->minlen = transform->maclen
+ cipher_info->block_size
- transform->maclen % cipher_info->block_size;
#if defined(POLARSSL_SSL_PROTO_SSL3) || defined(POLARSSL_SSL_PROTO_TLS1)
if( ssl->minor_ver == SSL_MINOR_VERSION_0 ||
ssl->minor_ver == SSL_MINOR_VERSION_1 )
; /* No need to adjust minlen */
else
#endif
#if defined(POLARSSL_SSL_PROTO_TLS1_1) || defined(POLARSSL_SSL_PROTO_TLS1_2)
if( ssl->minor_ver == SSL_MINOR_VERSION_2 ||
ssl->minor_ver == SSL_MINOR_VERSION_3 )
{
transform->minlen += transform->ivlen;
}
else
#endif
{
SSL_DEBUG_MSG( 1, ( "should never happen" ) );
return( POLARSSL_ERR_SSL_INTERNAL_ERROR );
}
}
}