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Make truncated hmac a runtime option server-side

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Reading the documentation of ssl_set_truncated_hmac() may give the impression
I changed the default for clients but I didn't, the old documentation was
wrong.
This commit is contained in:
Manuel Pégourié-Gonnard 2015-01-09 12:39:35 +01:00
parent 8e4b3374d7
commit e117a8fc0d
6 changed files with 72 additions and 13 deletions
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4
ChangeLog
View file

@ -9,6 +9,10 @@ Features
* Add support for Extended Master Secret (draft-ietf-tls-session-hash)
* Add support for Encrypt-then-MAC (RFC 7366)
Changes
* It is now possible to disable neogtiation of truncated HMAC server-side
at runtime with ssl_set_truncated_hmac().
= PolarSSL 1.3.9 released 2014-10-20
Security
* Lowest common hash was selected from signature_algorithms extension in

8
include/polarssl/ssl.h
View file

@ -1487,15 +1487,15 @@ int ssl_set_max_frag_len( ssl_context *ssl, unsigned char mfl_code );
#if defined(POLARSSL_SSL_TRUNCATED_HMAC)
/**
* \brief Activate negotiation of truncated HMAC (Client only)
* (Default: SSL_TRUNC_HMAC_ENABLED)
* \brief Activate negotiation of truncated HMAC
* (Default: SSL_TRUNC_HMAC_DISABLED on client,
* SSL_TRUNC_HMAC_ENABLED on server.)
*
* \param ssl SSL context
* \param truncate Enable or disable (SSL_TRUNC_HMAC_ENABLED or
* SSL_TRUNC_HMAC_DISABLED)
*
* \return O if successful,
* POLARSSL_ERR_SSL_BAD_INPUT_DATA if used server-side
* \return Always 0.
*/
int ssl_set_truncated_hmac( ssl_context *ssl, int truncate );
#endif /* POLARSSL_SSL_TRUNCATED_HMAC */

3
library/ssl_srv.c
View file

@ -629,7 +629,8 @@ static int ssl_parse_truncated_hmac_ext( ssl_context *ssl,
((void) buf);
ssl->session_negotiate->trunc_hmac = SSL_TRUNC_HMAC_ENABLED;
if( ssl->trunc_hmac == SSL_TRUNC_HMAC_ENABLED )
ssl->session_negotiate->trunc_hmac = SSL_TRUNC_HMAC_ENABLED;
return( 0 );
}

8
library/ssl_tls.c
View file

@ -3782,6 +3782,11 @@ void ssl_set_endpoint( ssl_context *ssl, int endpoint )
if( endpoint == SSL_IS_CLIENT )
ssl->session_tickets = SSL_SESSION_TICKETS_ENABLED;
#endif
#if defined(POLARSSL_SSL_TRUNCATED_HMAC)
if( endpoint == SSL_IS_SERVER )
ssl->trunc_hmac = SSL_TRUNC_HMAC_ENABLED;
#endif
}
void ssl_set_authmode( ssl_context *ssl, int authmode )
@ -4203,9 +4208,6 @@ int ssl_set_max_frag_len( ssl_context *ssl, unsigned char mfl_code )
#if defined(POLARSSL_SSL_TRUNCATED_HMAC)
int ssl_set_truncated_hmac( ssl_context *ssl, int truncate )
{
if( ssl->endpoint != SSL_IS_CLIENT )
return( POLARSSL_ERR_SSL_BAD_INPUT_DATA );
ssl->trunc_hmac = truncate;
return( 0 );

25
programs/ssl/ssl_server2.c
View file

@ -109,6 +109,7 @@ int main( int argc, char *argv[] )
#define DFL_MAX_VERSION -1
#define DFL_AUTH_MODE SSL_VERIFY_OPTIONAL
#define DFL_MFL_CODE SSL_MAX_FRAG_LEN_NONE
#define DFL_TRUNC_HMAC -1
#define DFL_TICKETS SSL_SESSION_TICKETS_ENABLED
#define DFL_TICKET_TIMEOUT -1
#define DFL_CACHE_MAX -1
@ -171,6 +172,7 @@ struct options
int max_version; /* maximum protocol version accepted */
int auth_mode; /* verify mode for connection */
unsigned char mfl_code; /* code for maximum fragment length */
int trunc_hmac; /* accept truncated hmac? */
int tickets; /* enable / disable session tickets */
int ticket_timeout; /* session ticket lifetime */
int cache_max; /* max number of session cache entries */
@ -295,6 +297,13 @@ static int my_send( void *ctx, const unsigned char *buf, size_t len )
#define USAGE_MAX_FRAG_LEN ""
#endif /* POLARSSL_SSL_MAX_FRAGMENT_LENGTH */
#if defined(POLARSSL_SSL_TRUNCATED_HMAC)
#define USAGE_TRUNC_HMAC \
" trunc_hmac=%%d default: library default\n"
#else
#define USAGE_TRUNC_HMAC ""
#endif
#if defined(POLARSSL_SSL_ALPN)
#define USAGE_ALPN \
" alpn=%%s default: \"\" (disabled)\n" \
@ -341,6 +350,7 @@ static int my_send( void *ctx, const unsigned char *buf, size_t len )
USAGE_TICKETS \
USAGE_CACHE \
USAGE_MAX_FRAG_LEN \
USAGE_TRUNC_HMAC \
USAGE_ALPN \
USAGE_EMS \
USAGE_ETM \
@ -726,6 +736,7 @@ int main( int argc, char *argv[] )
opt.max_version = DFL_MAX_VERSION;
opt.auth_mode = DFL_AUTH_MODE;
opt.mfl_code = DFL_MFL_CODE;
opt.trunc_hmac = DFL_TRUNC_HMAC;
opt.tickets = DFL_TICKETS;
opt.ticket_timeout = DFL_TICKET_TIMEOUT;
opt.cache_max = DFL_CACHE_MAX;
@ -902,6 +913,15 @@ int main( int argc, char *argv[] )
{
opt.alpn_string = q;
}
else if( strcmp( p, "trunc_hmac" ) == 0 )
{
switch( atoi( q ) )
{
case 0: opt.trunc_hmac = SSL_TRUNC_HMAC_DISABLED; break;
case 1: opt.trunc_hmac = SSL_TRUNC_HMAC_ENABLED; break;
default: goto usage;
}
}
else if( strcmp( p, "extended_ms" ) == 0 )
{
switch( atoi( q ) )
@ -1297,6 +1317,11 @@ int main( int argc, char *argv[] )
};
#endif
#if defined(POLARSSL_SSL_TRUNCATED_HMAC)
if( opt.trunc_hmac != DFL_TRUNC_HMAC )
ssl_set_truncated_hmac( &ssl, opt.trunc_hmac );
#endif
#if defined(POLARSSL_SSL_EXTENDED_MASTER_SECRET)
if( opt.extended_ms != DFL_EXTENDED_MS )
ssl_set_extended_master_secret( &ssl, opt.extended_ms );

37
tests/ssl-opt.sh
View file

@ -428,16 +428,43 @@ run_test "SSLv2 ClientHello: actual test" \
# Tests for Truncated HMAC extension
run_test "Truncated HMAC: reference" \
run_test "Truncated HMAC: client default, server default" \
"$P_SRV debug_level=4" \
"$P_CLI trunc_hmac=0 force_ciphersuite=TLS-RSA-WITH-AES-128-CBC-SHA" \
"$P_CLI force_ciphersuite=TLS-RSA-WITH-AES-128-CBC-SHA" \
0 \
-s "dumping 'computed mac' (20 bytes)"
-s "dumping 'computed mac' (20 bytes)" \
-S "dumping 'computed mac' (10 bytes)"
run_test "Truncated HMAC: actual test" \
run_test "Truncated HMAC: client disabled, server default" \
"$P_SRV debug_level=4" \
"$P_CLI trunc_hmac=1 force_ciphersuite=TLS-RSA-WITH-AES-128-CBC-SHA" \
"$P_CLI force_ciphersuite=TLS-RSA-WITH-AES-128-CBC-SHA \
trunc_hmac=0" \
0 \
-s "dumping 'computed mac' (20 bytes)" \
-S "dumping 'computed mac' (10 bytes)"
run_test "Truncated HMAC: client enabled, server default" \
"$P_SRV debug_level=4" \
"$P_CLI force_ciphersuite=TLS-RSA-WITH-AES-128-CBC-SHA \
trunc_hmac=1" \
0 \
-S "dumping 'computed mac' (20 bytes)" \
-s "dumping 'computed mac' (10 bytes)"
run_test "Truncated HMAC: client enabled, server disabled" \
"$P_SRV debug_level=4 trunc_hmac=0" \
"$P_CLI force_ciphersuite=TLS-RSA-WITH-AES-128-CBC-SHA \
trunc_hmac=1" \
0 \
-s "dumping 'computed mac' (20 bytes)" \
-S "dumping 'computed mac' (10 bytes)"
run_test "Truncated HMAC: client enabled, server enabled" \
"$P_SRV debug_level=4 trunc_hmac=1" \
"$P_CLI force_ciphersuite=TLS-RSA-WITH-AES-128-CBC-SHA \
trunc_hmac=1" \
0 \
-S "dumping 'computed mac' (20 bytes)" \
-s "dumping 'computed mac' (10 bytes)"
# Tests for Encrypt-then-MAC extension