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Uniformize bounds checks using new macro

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This commit uses the previously defined macro to uniformize
bounds checks in several places. It also adds bounds checks to
the ClientHello writing function that were previously missing.
Also, the functions adding extensions to the ClientHello message
can now fail if the buffer is too small or a different error
condition occurs, and moreover they take an additional buffer
end parameter to free them from the assumption that one is
writing to the default output buffer.

Signed-off-by: Ronald Cron <ronald.cron@arm.com>
This commit is contained in:
Hanno Becker 2017-04-12 14:54:42 +01:00 committed by Ronald Cron
parent dc7b5b97a1
commit 0e8dc48cff
4 changed files with 258 additions and 170 deletions
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9
ChangeLog.d/uniformize_bounds_checks.txt Normal file
View File

@ -0,0 +1,9 @@
Bugfix
* Add additional bounds checks in ssl_write_client_hello() preventing
output buffer overflow if the configuration declared a buffer that was
too small.
Changes
* Abort the ClientHello writing function as soon as some extension doesn't
fit into the record buffer. Previously, such extensions were silently
dropped. As a consequence, the TLS handshake now fails when the output
buffer is not large enough to hold the ClientHello.

375
library/ssl_cli.c
View File

@ -55,18 +55,18 @@ static void mbedtls_zeroize( void *v, size_t n ) {
#endif #endif
#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) #if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
static void ssl_write_hostname_ext( mbedtls_ssl_context *ssl, static int ssl_write_hostname_ext( mbedtls_ssl_context *ssl,
unsigned char *buf, unsigned char *buf,
const unsigned char *end,
size_t *olen ) size_t *olen )
{ {
unsigned char *p = buf; unsigned char *p = buf;
const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
size_t hostname_len; size_t hostname_len;
*olen = 0; *olen = 0;
if( ssl->hostname == NULL ) if( ssl->hostname == NULL )
return; return( 0 );
MBEDTLS_SSL_DEBUG_MSG( 3, MBEDTLS_SSL_DEBUG_MSG( 3,
( "client hello, adding server name extension: %s", ( "client hello, adding server name extension: %s",
@ -74,11 +74,7 @@ static void ssl_write_hostname_ext( mbedtls_ssl_context *ssl,
hostname_len = strlen( ssl->hostname ); hostname_len = strlen( ssl->hostname );
if( end < p || (size_t)( end - p ) < hostname_len + 9 ) MBEDTLS_SSL_CHK_BUF_PTR( p, end, hostname_len + 9 );
{
MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
return;
}
/* /*
* Sect. 3, RFC 6066 (TLS Extensions Definitions) * Sect. 3, RFC 6066 (TLS Extensions Definitions)
@ -122,16 +118,18 @@ static void ssl_write_hostname_ext( mbedtls_ssl_context *ssl,
memcpy( p, ssl->hostname, hostname_len ); memcpy( p, ssl->hostname, hostname_len );
*olen = hostname_len + 9; *olen = hostname_len + 9;
return( 0 );
} }
#endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */ #endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */
#if defined(MBEDTLS_SSL_RENEGOTIATION) #if defined(MBEDTLS_SSL_RENEGOTIATION)
static void ssl_write_renegotiation_ext( mbedtls_ssl_context *ssl, static int ssl_write_renegotiation_ext( mbedtls_ssl_context *ssl,
unsigned char *buf, unsigned char *buf,
const unsigned char *end,
size_t *olen ) size_t *olen )
{ {
unsigned char *p = buf; unsigned char *p = buf;
const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
*olen = 0; *olen = 0;
@ -139,16 +137,12 @@ static void ssl_write_renegotiation_ext( mbedtls_ssl_context *ssl,
* initial ClientHello, in which case also adding the renegotiation * initial ClientHello, in which case also adding the renegotiation
* info extension is NOT RECOMMENDED as per RFC 5746 Section 3.4. */ * info extension is NOT RECOMMENDED as per RFC 5746 Section 3.4. */
if( ssl->renego_status != MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS ) if( ssl->renego_status != MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS )
return; return( 0 );
MBEDTLS_SSL_DEBUG_MSG( 3, MBEDTLS_SSL_DEBUG_MSG( 3,
( "client hello, adding renegotiation extension" ) ); ( "client hello, adding renegotiation extension" ) );
if( end < p || (size_t)( end - p ) < 5 + ssl->verify_data_len ) MBEDTLS_SSL_CHK_BUF_PTR( p, end, 5 + ssl->verify_data_len );
{
MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
return;
}
/* /*
* Secure renegotiation * Secure renegotiation
@ -165,6 +159,8 @@ static void ssl_write_renegotiation_ext( mbedtls_ssl_context *ssl,
memcpy( p, ssl->own_verify_data, ssl->verify_data_len ); memcpy( p, ssl->own_verify_data, ssl->verify_data_len );
*olen = 5 + ssl->verify_data_len; *olen = 5 + ssl->verify_data_len;
return( 0 );
} }
#endif /* MBEDTLS_SSL_RENEGOTIATION */ #endif /* MBEDTLS_SSL_RENEGOTIATION */
@ -173,14 +169,15 @@ static void ssl_write_renegotiation_ext( mbedtls_ssl_context *ssl,
*/ */
#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \ #if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \
defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED) defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
static void ssl_write_signature_algorithms_ext( mbedtls_ssl_context *ssl, static int ssl_write_signature_algorithms_ext( mbedtls_ssl_context *ssl,
unsigned char *buf, unsigned char *buf,
const unsigned char *end,
size_t *olen ) size_t *olen )
{ {
unsigned char *p = buf; unsigned char *p = buf;
const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
size_t sig_alg_len = 0; size_t sig_alg_len = 0;
const int *md; const int *md;
#if defined(MBEDTLS_RSA_C) || defined(MBEDTLS_ECDSA_C) #if defined(MBEDTLS_RSA_C) || defined(MBEDTLS_ECDSA_C)
unsigned char *sig_alg_list = buf + 6; unsigned char *sig_alg_list = buf + 6;
#endif #endif
@ -188,7 +185,7 @@ static void ssl_write_signature_algorithms_ext( mbedtls_ssl_context *ssl,
*olen = 0; *olen = 0;
if( ssl->conf->max_minor_ver != MBEDTLS_SSL_MINOR_VERSION_3 ) if( ssl->conf->max_minor_ver != MBEDTLS_SSL_MINOR_VERSION_3 )
return; return( 0 );
MBEDTLS_SSL_DEBUG_MSG( 3, MBEDTLS_SSL_DEBUG_MSG( 3,
( "client hello, adding signature_algorithms extension" ) ); ( "client hello, adding signature_algorithms extension" ) );
@ -203,11 +200,7 @@ static void ssl_write_signature_algorithms_ext( mbedtls_ssl_context *ssl,
#endif #endif
} }
if( end < p || (size_t)( end - p ) < sig_alg_len + 6 ) MBEDTLS_SSL_CHK_BUF_PTR( p, end, sig_alg_len + 6 );
{
MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
return;
}
/* /*
* Prepare signature_algorithms extension (TLS 1.2) * Prepare signature_algorithms extension (TLS 1.2)
@ -253,18 +246,20 @@ static void ssl_write_signature_algorithms_ext( mbedtls_ssl_context *ssl,
*p++ = (unsigned char)( ( sig_alg_len ) & 0xFF ); *p++ = (unsigned char)( ( sig_alg_len ) & 0xFF );
*olen = 6 + sig_alg_len; *olen = 6 + sig_alg_len;
return( 0 );
} }
#endif /* MBEDTLS_SSL_PROTO_TLS1_2 && #endif /* MBEDTLS_SSL_PROTO_TLS1_2 &&
MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */ MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */
#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \ #if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \
defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
static void ssl_write_supported_elliptic_curves_ext( mbedtls_ssl_context *ssl, static int ssl_write_supported_elliptic_curves_ext( mbedtls_ssl_context *ssl,
unsigned char *buf, unsigned char *buf,
const unsigned char *end,
size_t *olen ) size_t *olen )
{ {
unsigned char *p = buf; unsigned char *p = buf;
const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
unsigned char *elliptic_curve_list = p + 6; unsigned char *elliptic_curve_list = p + 6;
size_t elliptic_curve_len = 0; size_t elliptic_curve_len = 0;
const mbedtls_ecp_curve_info *info; const mbedtls_ecp_curve_info *info;
@ -284,17 +279,15 @@ static void ssl_write_supported_elliptic_curves_ext( mbedtls_ssl_context *ssl,
{ {
MBEDTLS_SSL_DEBUG_MSG( 1, MBEDTLS_SSL_DEBUG_MSG( 1,
( "invalid curve in ssl configuration" ) ); ( "invalid curve in ssl configuration" ) );
return; return( 0 );
} }
elliptic_curve_len += 2; elliptic_curve_len += 2;
} }
if( end < p || (size_t)( end - p ) < 6 + elliptic_curve_len ) if( elliptic_curve_len == 0 )
{ return( 0 );
MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
return; MBEDTLS_SSL_CHK_BUF_PTR( p, end, 6 + elliptic_curve_len );
}
elliptic_curve_len = 0; elliptic_curve_len = 0;
@ -307,9 +300,6 @@ static void ssl_write_supported_elliptic_curves_ext( mbedtls_ssl_context *ssl,
elliptic_curve_list[elliptic_curve_len++] = info->tls_id & 0xFF; elliptic_curve_list[elliptic_curve_len++] = info->tls_id & 0xFF;
} }
if( elliptic_curve_len == 0 )
return;
*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SUPPORTED_ELLIPTIC_CURVES >> 8 ) *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SUPPORTED_ELLIPTIC_CURVES >> 8 )
& 0xFF ); & 0xFF );
*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SUPPORTED_ELLIPTIC_CURVES ) *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SUPPORTED_ELLIPTIC_CURVES )
@ -322,25 +312,23 @@ static void ssl_write_supported_elliptic_curves_ext( mbedtls_ssl_context *ssl,
*p++ = (unsigned char)( ( ( elliptic_curve_len ) ) & 0xFF ); *p++ = (unsigned char)( ( ( elliptic_curve_len ) ) & 0xFF );
*olen = 6 + elliptic_curve_len; *olen = 6 + elliptic_curve_len;
return( 0 );
} }
static void ssl_write_supported_point_formats_ext( mbedtls_ssl_context *ssl, static int ssl_write_supported_point_formats_ext( mbedtls_ssl_context *ssl,
unsigned char *buf, unsigned char *buf,
const unsigned char *end,
size_t *olen ) size_t *olen )
{ {
unsigned char *p = buf; unsigned char *p = buf;
const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN; (void) ssl; /* ssl used for debugging only */
*olen = 0; *olen = 0;
MBEDTLS_SSL_DEBUG_MSG( 3, MBEDTLS_SSL_DEBUG_MSG( 3,
( "client hello, adding supported_point_formats extension" ) ); ( "client hello, adding supported_point_formats extension" ) );
MBEDTLS_SSL_CHK_BUF_PTR( p, end, 6 );
if( end < p || (size_t)( end - p ) < 6 )
{
MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
return;
}
*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS >> 8 ) *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS >> 8 )
& 0xFF ); & 0xFF );
@ -354,34 +342,32 @@ static void ssl_write_supported_point_formats_ext( mbedtls_ssl_context *ssl,
*p++ = MBEDTLS_ECP_PF_UNCOMPRESSED; *p++ = MBEDTLS_ECP_PF_UNCOMPRESSED;
*olen = 6; *olen = 6;
return( 0 );
} }
#endif /* MBEDTLS_ECDH_C || MBEDTLS_ECDSA_C || #endif /* MBEDTLS_ECDH_C || MBEDTLS_ECDSA_C ||
MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */ MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) #if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
static void ssl_write_ecjpake_kkpp_ext( mbedtls_ssl_context *ssl, static int ssl_write_ecjpake_kkpp_ext( mbedtls_ssl_context *ssl,
unsigned char *buf, unsigned char *buf,
const unsigned char *end,
size_t *olen ) size_t *olen )
{ {
int ret; int ret;
unsigned char *p = buf; unsigned char *p = buf;
const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
size_t kkpp_len; size_t kkpp_len;
*olen = 0; *olen = 0;
/* Skip costly extension if we can't use EC J-PAKE anyway */ /* Skip costly extension if we can't use EC J-PAKE anyway */
if( mbedtls_ecjpake_check( &ssl->handshake->ecjpake_ctx ) != 0 ) if( mbedtls_ecjpake_check( &ssl->handshake->ecjpake_ctx ) != 0 )
return; return( 0 );
MBEDTLS_SSL_DEBUG_MSG( 3, MBEDTLS_SSL_DEBUG_MSG( 3,
( "client hello, adding ecjpake_kkpp extension" ) ); ( "client hello, adding ecjpake_kkpp extension" ) );
if( end - p < 4 ) MBEDTLS_SSL_CHK_BUF_PTR( p, end, 4 );
{
MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
return;
}
*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ECJPAKE_KKPP >> 8 ) & 0xFF ); *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ECJPAKE_KKPP >> 8 ) & 0xFF );
*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ECJPAKE_KKPP ) & 0xFF ); *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ECJPAKE_KKPP ) & 0xFF );
@ -403,14 +389,14 @@ static void ssl_write_ecjpake_kkpp_ext( mbedtls_ssl_context *ssl,
{ {
MBEDTLS_SSL_DEBUG_RET( 1 , MBEDTLS_SSL_DEBUG_RET( 1 ,
"mbedtls_ecjpake_write_round_one", ret ); "mbedtls_ecjpake_write_round_one", ret );
return; return( ret );
} }
ssl->handshake->ecjpake_cache = mbedtls_calloc( 1, kkpp_len ); ssl->handshake->ecjpake_cache = mbedtls_calloc( 1, kkpp_len );
if( ssl->handshake->ecjpake_cache == NULL ) if( ssl->handshake->ecjpake_cache == NULL )
{ {
MBEDTLS_SSL_DEBUG_MSG( 1, ( "allocation failed" ) ); MBEDTLS_SSL_DEBUG_MSG( 1, ( "allocation failed" ) );
return; return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
} }
memcpy( ssl->handshake->ecjpake_cache, p + 2, kkpp_len ); memcpy( ssl->handshake->ecjpake_cache, p + 2, kkpp_len );
@ -421,12 +407,7 @@ static void ssl_write_ecjpake_kkpp_ext( mbedtls_ssl_context *ssl,
MBEDTLS_SSL_DEBUG_MSG( 3, ( "re-using cached ecjpake parameters" ) ); MBEDTLS_SSL_DEBUG_MSG( 3, ( "re-using cached ecjpake parameters" ) );
kkpp_len = ssl->handshake->ecjpake_cache_len; kkpp_len = ssl->handshake->ecjpake_cache_len;
MBEDTLS_SSL_CHK_BUF_PTR( p + 2, end, kkpp_len );
if( (size_t)( end - p - 2 ) < kkpp_len )
{
MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
return;
}
memcpy( p + 2, ssl->handshake->ecjpake_cache, kkpp_len ); memcpy( p + 2, ssl->handshake->ecjpake_cache, kkpp_len );
} }
@ -435,31 +416,28 @@ static void ssl_write_ecjpake_kkpp_ext( mbedtls_ssl_context *ssl,
*p++ = (unsigned char)( ( kkpp_len ) & 0xFF ); *p++ = (unsigned char)( ( kkpp_len ) & 0xFF );
*olen = kkpp_len + 4; *olen = kkpp_len + 4;
return( 0 );
} }
#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */ #endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) #if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
static void ssl_write_max_fragment_length_ext( mbedtls_ssl_context *ssl, static int ssl_write_max_fragment_length_ext( mbedtls_ssl_context *ssl,
unsigned char *buf, unsigned char *buf,
const unsigned char *end,
size_t *olen ) size_t *olen )
{ {
unsigned char *p = buf; unsigned char *p = buf;
const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
*olen = 0; *olen = 0;
if( ssl->conf->mfl_code == MBEDTLS_SSL_MAX_FRAG_LEN_NONE ) { if( ssl->conf->mfl_code == MBEDTLS_SSL_MAX_FRAG_LEN_NONE )
return; return( 0 );
}
MBEDTLS_SSL_DEBUG_MSG( 3, MBEDTLS_SSL_DEBUG_MSG( 3,
( "client hello, adding max_fragment_length extension" ) ); ( "client hello, adding max_fragment_length extension" ) );
if( end < p || (size_t)( end - p ) < 5 ) MBEDTLS_SSL_CHK_BUF_PTR( p, end, 5 );
{
MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
return;
}
*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_MAX_FRAGMENT_LENGTH >> 8 ) *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_MAX_FRAGMENT_LENGTH >> 8 )
& 0xFF ); & 0xFF );
@ -472,31 +450,28 @@ static void ssl_write_max_fragment_length_ext( mbedtls_ssl_context *ssl,
*p++ = ssl->conf->mfl_code; *p++ = ssl->conf->mfl_code;
*olen = 5; *olen = 5;
return( 0 );
} }
#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */ #endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
#if defined(MBEDTLS_SSL_TRUNCATED_HMAC) #if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
static void ssl_write_truncated_hmac_ext( mbedtls_ssl_context *ssl, static int ssl_write_truncated_hmac_ext( mbedtls_ssl_context *ssl,
unsigned char *buf, size_t *olen ) unsigned char *buf,
const unsigned char *end,
size_t *olen )
{ {
unsigned char *p = buf; unsigned char *p = buf;
const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
*olen = 0; *olen = 0;
if( ssl->conf->trunc_hmac == MBEDTLS_SSL_TRUNC_HMAC_DISABLED ) if( ssl->conf->trunc_hmac == MBEDTLS_SSL_TRUNC_HMAC_DISABLED )
{ return( 0 );
return;
}
MBEDTLS_SSL_DEBUG_MSG( 3, MBEDTLS_SSL_DEBUG_MSG( 3,
( "client hello, adding truncated_hmac extension" ) ); ( "client hello, adding truncated_hmac extension" ) );
if( end < p || (size_t)( end - p ) < 4 ) MBEDTLS_SSL_CHK_BUF_PTR( p, end, 4 );
{
MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
return;
}
*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_TRUNCATED_HMAC >> 8 ) & 0xFF ); *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_TRUNCATED_HMAC >> 8 ) & 0xFF );
*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_TRUNCATED_HMAC ) & 0xFF ); *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_TRUNCATED_HMAC ) & 0xFF );
@ -505,32 +480,29 @@ static void ssl_write_truncated_hmac_ext( mbedtls_ssl_context *ssl,
*p++ = 0x00; *p++ = 0x00;
*olen = 4; *olen = 4;
return( 0 );
} }
#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */ #endif /* MBEDTLS_SSL_TRUNCATED_HMAC */
#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
static void ssl_write_encrypt_then_mac_ext( mbedtls_ssl_context *ssl, static int ssl_write_encrypt_then_mac_ext( mbedtls_ssl_context *ssl,
unsigned char *buf, size_t *olen ) unsigned char *buf,
const unsigned char *end,
size_t *olen )
{ {
unsigned char *p = buf; unsigned char *p = buf;
const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
*olen = 0; *olen = 0;
if( ssl->conf->encrypt_then_mac == MBEDTLS_SSL_ETM_DISABLED || if( ssl->conf->encrypt_then_mac == MBEDTLS_SSL_ETM_DISABLED ||
ssl->conf->max_minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ) ssl->conf->max_minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
{ return( 0 );
return;
}
MBEDTLS_SSL_DEBUG_MSG( 3, MBEDTLS_SSL_DEBUG_MSG( 3,
( "client hello, adding encrypt_then_mac extension" ) ); ( "client hello, adding encrypt_then_mac extension" ) );
if( end < p || (size_t)( end - p ) < 4 ) MBEDTLS_SSL_CHK_BUF_PTR( p, end, 4 );
{
MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
return;
}
*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ENCRYPT_THEN_MAC >> 8 ) & 0xFF ); *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ENCRYPT_THEN_MAC >> 8 ) & 0xFF );
*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ENCRYPT_THEN_MAC ) & 0xFF ); *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ENCRYPT_THEN_MAC ) & 0xFF );
@ -539,32 +511,29 @@ static void ssl_write_encrypt_then_mac_ext( mbedtls_ssl_context *ssl,
*p++ = 0x00; *p++ = 0x00;
*olen = 4; *olen = 4;
return( 0 );
} }
#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */ #endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */
#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET) #if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
static void ssl_write_extended_ms_ext( mbedtls_ssl_context *ssl, static int ssl_write_extended_ms_ext( mbedtls_ssl_context *ssl,
unsigned char *buf, size_t *olen ) unsigned char *buf,
const unsigned char *end,
size_t *olen )
{ {
unsigned char *p = buf; unsigned char *p = buf;
const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
*olen = 0; *olen = 0;
if( ssl->conf->extended_ms == MBEDTLS_SSL_EXTENDED_MS_DISABLED || if( ssl->conf->extended_ms == MBEDTLS_SSL_EXTENDED_MS_DISABLED ||
ssl->conf->max_minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ) ssl->conf->max_minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
{ return( 0 );
return;
}
MBEDTLS_SSL_DEBUG_MSG( 3, MBEDTLS_SSL_DEBUG_MSG( 3,
( "client hello, adding extended_master_secret extension" ) ); ( "client hello, adding extended_master_secret extension" ) );
if( end < p || (size_t)( end - p ) < 4 ) MBEDTLS_SSL_CHK_BUF_PTR( p, end, 4 );
{
MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
return;
}
*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_EXTENDED_MASTER_SECRET >> 8 ) *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_EXTENDED_MASTER_SECRET >> 8 )
& 0xFF ); & 0xFF );
@ -575,32 +544,30 @@ static void ssl_write_extended_ms_ext( mbedtls_ssl_context *ssl,
*p++ = 0x00; *p++ = 0x00;
*olen = 4; *olen = 4;
return( 0 );
} }
#endif /* MBEDTLS_SSL_EXTENDED_MASTER_SECRET */ #endif /* MBEDTLS_SSL_EXTENDED_MASTER_SECRET */
#if defined(MBEDTLS_SSL_SESSION_TICKETS) #if defined(MBEDTLS_SSL_SESSION_TICKETS)
static void ssl_write_session_ticket_ext( mbedtls_ssl_context *ssl, static int ssl_write_session_ticket_ext( mbedtls_ssl_context *ssl,
unsigned char *buf, size_t *olen ) unsigned char *buf,
const unsigned char *end,
size_t *olen )
{ {
unsigned char *p = buf; unsigned char *p = buf;
const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
size_t tlen = ssl->session_negotiate->ticket_len; size_t tlen = ssl->session_negotiate->ticket_len;
*olen = 0; *olen = 0;
if( ssl->conf->session_tickets == MBEDTLS_SSL_SESSION_TICKETS_DISABLED ) if( ssl->conf->session_tickets == MBEDTLS_SSL_SESSION_TICKETS_DISABLED )
{ return( 0 );
return;
}
MBEDTLS_SSL_DEBUG_MSG( 3, MBEDTLS_SSL_DEBUG_MSG( 3,
( "client hello, adding session ticket extension" ) ); ( "client hello, adding session ticket extension" ) );
if( end < p || (size_t)( end - p ) < 4 + tlen ) /* The addition is safe here since the ticket length is 16 bit. */
{ MBEDTLS_SSL_CHK_BUF_PTR( p, end, 4 + tlen );
MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
return;
}
*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SESSION_TICKET >> 8 ) & 0xFF ); *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SESSION_TICKET >> 8 ) & 0xFF );
*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SESSION_TICKET ) & 0xFF ); *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SESSION_TICKET ) & 0xFF );
@ -611,9 +578,7 @@ static void ssl_write_session_ticket_ext( mbedtls_ssl_context *ssl,
*olen = 4; *olen = 4;
if( ssl->session_negotiate->ticket == NULL || tlen == 0 ) if( ssl->session_negotiate->ticket == NULL || tlen == 0 )
{ return( 0 );
return;
}
MBEDTLS_SSL_DEBUG_MSG( 3, MBEDTLS_SSL_DEBUG_MSG( 3,
( "sending session ticket of length %d", tlen ) ); ( "sending session ticket of length %d", tlen ) );
@ -621,35 +586,32 @@ static void ssl_write_session_ticket_ext( mbedtls_ssl_context *ssl,
memcpy( p, ssl->session_negotiate->ticket, tlen ); memcpy( p, ssl->session_negotiate->ticket, tlen );
*olen += tlen; *olen += tlen;
return( 0 );
} }
#endif /* MBEDTLS_SSL_SESSION_TICKETS */ #endif /* MBEDTLS_SSL_SESSION_TICKETS */
#if defined(MBEDTLS_SSL_ALPN) #if defined(MBEDTLS_SSL_ALPN)
static void ssl_write_alpn_ext( mbedtls_ssl_context *ssl, static int ssl_write_alpn_ext( mbedtls_ssl_context *ssl,
unsigned char *buf, size_t *olen ) unsigned char *buf,
const unsigned char *end,
size_t *olen )
{ {
unsigned char *p = buf; unsigned char *p = buf;
const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
size_t alpnlen = 0; size_t alpnlen = 0;
const char **cur; const char **cur;
*olen = 0; *olen = 0;
if( ssl->conf->alpn_list == NULL ) if( ssl->conf->alpn_list == NULL )
{ return( 0 );
return;
}
MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding alpn extension" ) ); MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding alpn extension" ) );
for( cur = ssl->conf->alpn_list; *cur != NULL; cur++ ) for( cur = ssl->conf->alpn_list; *cur != NULL; cur++ )
alpnlen += (unsigned char)( strlen( *cur ) & 0xFF ) + 1; alpnlen += (unsigned char)( strlen( *cur ) & 0xFF ) + 1;
if( end < p || (size_t)( end - p ) < 6 + alpnlen ) MBEDTLS_SSL_CHK_BUF_PTR( p, end, 6 + alpnlen );
{
MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
return;
}
*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ALPN >> 8 ) & 0xFF ); *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ALPN >> 8 ) & 0xFF );
*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ALPN ) & 0xFF ); *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ALPN ) & 0xFF );
@ -681,6 +643,8 @@ static void ssl_write_alpn_ext( mbedtls_ssl_context *ssl,
/* Extension length = olen - 2 (ext_type) - 2 (ext_len) */ /* Extension length = olen - 2 (ext_type) - 2 (ext_len) */
buf[2] = (unsigned char)( ( ( *olen - 4 ) >> 8 ) & 0xFF ); buf[2] = (unsigned char)( ( ( *olen - 4 ) >> 8 ) & 0xFF );
buf[3] = (unsigned char)( ( ( *olen - 4 ) ) & 0xFF ); buf[3] = (unsigned char)( ( ( *olen - 4 ) ) & 0xFF );
return( 0 );
} }
#endif /* MBEDTLS_SSL_ALPN */ #endif /* MBEDTLS_SSL_ALPN */
@ -775,8 +739,11 @@ static int ssl_write_client_hello( mbedtls_ssl_context *ssl )
{ {
int ret; int ret;
size_t i, n, olen, ext_len = 0; size_t i, n, olen, ext_len = 0;
unsigned char *buf; unsigned char *buf;
unsigned char *p, *q; unsigned char *p, *q;
const unsigned char *end;
unsigned char offer_compress; unsigned char offer_compress;
const int *ciphersuites; const int *ciphersuites;
const mbedtls_ssl_ciphersuite_t *ciphersuite_info; const mbedtls_ssl_ciphersuite_t *ciphersuite_info;
@ -808,16 +775,33 @@ static int ssl_write_client_hello( mbedtls_ssl_context *ssl )
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
} }
buf = ssl->out_msg;
end = buf + MBEDTLS_SSL_MAX_CONTENT_LEN;
/* /*
* 0 . 0 handshake type * Check if there's enough space for the first part of the ClientHello
* 1 . 3 handshake length * consisting of the 38 bytes described below, the session identifier (at
* most 32 bytes) and its length (1 byte).
*
* Use static upper bounds instead of the actual values
* to allow the compiler to optimize this away.
*/
MBEDTLS_SSL_CHK_BUF_PTR( buf, end, 38 + 1 + 32 );
/*
* The 38 first bytes of the ClientHello:
* 0 . 0 handshake type (written later)
* 1 . 3 handshake length (written later)
* 4 . 5 highest version supported * 4 . 5 highest version supported
* 6 . 9 current UNIX time * 6 . 9 current UNIX time
* 10 . 37 random bytes * 10 . 37 random bytes
*
* The current UNIX time (4 bytes) and following 28 random bytes are written
* by ssl_generate_random() into ssl->handshake->randbytes buffer and then
* copied from there into the output buffer.
*/ */
buf = ssl->out_msg;
p = buf + 4;
p = buf + 4;
mbedtls_ssl_write_version( ssl->conf->max_major_ver, mbedtls_ssl_write_version( ssl->conf->max_major_ver,
ssl->conf->max_minor_ver, ssl->conf->max_minor_ver,
ssl->conf->transport, p ); ssl->conf->transport, p );
@ -840,7 +824,7 @@ static int ssl_write_client_hello( mbedtls_ssl_context *ssl )
* 38 . 38 session id length * 38 . 38 session id length
* 39 . 39+n session id * 39 . 39+n session id
* 39+n . 39+n DTLS only: cookie length (1 byte) * 39+n . 39+n DTLS only: cookie length (1 byte)
* 40+n . .. DTSL only: cookie * 40+n . .. DTLS only: cookie
* .. . .. ciphersuitelist length (2 bytes) * .. . .. ciphersuitelist length (2 bytes)
* .. . .. ciphersuitelist * .. . .. ciphersuitelist
* .. . .. compression methods length (1 byte) * .. . .. compression methods length (1 byte)
@ -882,6 +866,12 @@ static int ssl_write_client_hello( mbedtls_ssl_context *ssl )
} }
#endif /* MBEDTLS_SSL_SESSION_TICKETS */ #endif /* MBEDTLS_SSL_SESSION_TICKETS */
/*
* The first check of the output buffer size above (
* MBEDTLS_SSL_CHK_BUF_PTR( buf, end, 38 + 1 + 32 );)
* has checked that there is enough space in the output buffer for the
* session identifier length byte and the session identifier (n <= 32).
*/
*p++ = (unsigned char) n; *p++ = (unsigned char) n;
for( i = 0; i < n; i++ ) for( i = 0; i < n; i++ )
@ -890,12 +880,27 @@ static int ssl_write_client_hello( mbedtls_ssl_context *ssl )
MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, session id len.: %d", n ) ); MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, session id len.: %d", n ) );
MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, session id", buf + 39, n ); MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, session id", buf + 39, n );
/*
* With 'n' being the length of the session identifier
*
* 39+n . 39+n DTLS only: cookie length (1 byte)
* 40+n . .. DTLS only: cookie
* .. . .. ciphersuitelist length (2 bytes)
* .. . .. ciphersuitelist
* .. . .. compression methods length (1 byte)
* .. . .. compression methods
* .. . .. extensions length (2 bytes)
* .. . .. extensions
*/
/* /*
* DTLS cookie * DTLS cookie
*/ */
#if defined(MBEDTLS_SSL_PROTO_DTLS) #if defined(MBEDTLS_SSL_PROTO_DTLS)
if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
{ {
MBEDTLS_SSL_CHK_BUF_PTR( p, end, 1 );
if( ssl->handshake->verify_cookie == NULL ) if( ssl->handshake->verify_cookie == NULL )
{ {
MBEDTLS_SSL_DEBUG_MSG( 3, ( "no verify cookie to send" ) ); MBEDTLS_SSL_DEBUG_MSG( 3, ( "no verify cookie to send" ) );
@ -908,6 +913,9 @@ static int ssl_write_client_hello( mbedtls_ssl_context *ssl )
ssl->handshake->verify_cookie_len ); ssl->handshake->verify_cookie_len );
*p++ = ssl->handshake->verify_cookie_len; *p++ = ssl->handshake->verify_cookie_len;
MBEDTLS_SSL_CHK_BUF_PTR( p, end,
ssl->handshake->verify_cookie_len );
memcpy( p, ssl->handshake->verify_cookie, memcpy( p, ssl->handshake->verify_cookie,
ssl->handshake->verify_cookie_len ); ssl->handshake->verify_cookie_len );
p += ssl->handshake->verify_cookie_len; p += ssl->handshake->verify_cookie_len;
@ -923,6 +931,8 @@ static int ssl_write_client_hello( mbedtls_ssl_context *ssl )
/* Skip writing ciphersuite length for now */ /* Skip writing ciphersuite length for now */
n = 0; n = 0;
q = p; q = p;
MBEDTLS_SSL_CHK_BUF_PTR( p, end, 2 );
p += 2; p += 2;
for( i = 0; ciphersuites[i] != 0; i++ ) for( i = 0; ciphersuites[i] != 0; i++ )
@ -942,6 +952,8 @@ static int ssl_write_client_hello( mbedtls_ssl_context *ssl )
uses_ec |= mbedtls_ssl_ciphersuite_uses_ec( ciphersuite_info ); uses_ec |= mbedtls_ssl_ciphersuite_uses_ec( ciphersuite_info );
#endif #endif
MBEDTLS_SSL_CHK_BUF_PTR( p, end, 2 );
n++; n++;
*p++ = (unsigned char)( ciphersuites[i] >> 8 ); *p++ = (unsigned char)( ciphersuites[i] >> 8 );
*p++ = (unsigned char)( ciphersuites[i] ); *p++ = (unsigned char)( ciphersuites[i] );
@ -958,6 +970,7 @@ static int ssl_write_client_hello( mbedtls_ssl_context *ssl )
#endif #endif
{ {
MBEDTLS_SSL_DEBUG_MSG( 3, ( "adding EMPTY_RENEGOTIATION_INFO_SCSV" ) ); MBEDTLS_SSL_DEBUG_MSG( 3, ( "adding EMPTY_RENEGOTIATION_INFO_SCSV" ) );
MBEDTLS_SSL_CHK_BUF_PTR( p, end, 2 );
*p++ = (unsigned char)( MBEDTLS_SSL_EMPTY_RENEGOTIATION_INFO >> 8 ); *p++ = (unsigned char)( MBEDTLS_SSL_EMPTY_RENEGOTIATION_INFO >> 8 );
*p++ = (unsigned char)( MBEDTLS_SSL_EMPTY_RENEGOTIATION_INFO ); *p++ = (unsigned char)( MBEDTLS_SSL_EMPTY_RENEGOTIATION_INFO );
n++; n++;
@ -968,6 +981,8 @@ static int ssl_write_client_hello( mbedtls_ssl_context *ssl )
if( ssl->conf->fallback == MBEDTLS_SSL_IS_FALLBACK ) if( ssl->conf->fallback == MBEDTLS_SSL_IS_FALLBACK )
{ {
MBEDTLS_SSL_DEBUG_MSG( 3, ( "adding FALLBACK_SCSV" ) ); MBEDTLS_SSL_DEBUG_MSG( 3, ( "adding FALLBACK_SCSV" ) );
MBEDTLS_SSL_CHK_BUF_PTR( p, end, 2 );
*p++ = (unsigned char)( MBEDTLS_SSL_FALLBACK_SCSV_VALUE >> 8 ); *p++ = (unsigned char)( MBEDTLS_SSL_FALLBACK_SCSV_VALUE >> 8 );
*p++ = (unsigned char)( MBEDTLS_SSL_FALLBACK_SCSV_VALUE ); *p++ = (unsigned char)( MBEDTLS_SSL_FALLBACK_SCSV_VALUE );
n++; n++;
@ -1001,6 +1016,7 @@ static int ssl_write_client_hello( mbedtls_ssl_context *ssl )
MBEDTLS_SSL_COMPRESS_DEFLATE, MBEDTLS_SSL_COMPRESS_DEFLATE,
MBEDTLS_SSL_COMPRESS_NULL ) ); MBEDTLS_SSL_COMPRESS_NULL ) );
MBEDTLS_SSL_CHK_BUF_PTR( p, end, 3 );
*p++ = 2; *p++ = 2;
*p++ = MBEDTLS_SSL_COMPRESS_DEFLATE; *p++ = MBEDTLS_SSL_COMPRESS_DEFLATE;
*p++ = MBEDTLS_SSL_COMPRESS_NULL; *p++ = MBEDTLS_SSL_COMPRESS_NULL;
@ -1011,27 +1027,45 @@ static int ssl_write_client_hello( mbedtls_ssl_context *ssl )
MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, compress alg.: %d", MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, compress alg.: %d",
MBEDTLS_SSL_COMPRESS_NULL ) ); MBEDTLS_SSL_COMPRESS_NULL ) );
MBEDTLS_SSL_CHK_BUF_PTR( p, end, 2 );
*p++ = 1; *p++ = 1;
*p++ = MBEDTLS_SSL_COMPRESS_NULL; *p++ = MBEDTLS_SSL_COMPRESS_NULL;
} }
// First write extensions, then the total length /* First write extensions, then the total length */
//
MBEDTLS_SSL_CHK_BUF_PTR( p, end, 2 );
#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) #if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
ssl_write_hostname_ext( ssl, p + 2 + ext_len, &olen ); if( ( ret = ssl_write_hostname_ext( ssl, p + 2 + ext_len,
end, &olen ) ) != 0 )
{
MBEDTLS_SSL_DEBUG_RET( 1, "ssl_write_hostname_ext", ret );
return( ret );
}
ext_len += olen; ext_len += olen;
#endif #endif
/* Note that TLS_EMPTY_RENEGOTIATION_INFO_SCSV is always added /* Note that TLS_EMPTY_RENEGOTIATION_INFO_SCSV is always added
* even if MBEDTLS_SSL_RENEGOTIATION is not defined. */ * even if MBEDTLS_SSL_RENEGOTIATION is not defined. */
#if defined(MBEDTLS_SSL_RENEGOTIATION) #if defined(MBEDTLS_SSL_RENEGOTIATION)
ssl_write_renegotiation_ext( ssl, p + 2 + ext_len, &olen ); if( ( ret = ssl_write_renegotiation_ext( ssl, p + 2 + ext_len,
end, &olen ) ) != 0 )
{
MBEDTLS_SSL_DEBUG_RET( 1, "ssl_write_renegotiation_ext", ret );
return( ret );
}
ext_len += olen; ext_len += olen;
#endif #endif
#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \ #if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \
defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED) defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
ssl_write_signature_algorithms_ext( ssl, p + 2 + ext_len, &olen ); if( ( ret = ssl_write_signature_algorithms_ext( ssl, p + 2 + ext_len,
end, &olen ) ) != 0 )
{
MBEDTLS_SSL_DEBUG_RET( 1, "ssl_write_signature_algorithms_ext", ret );
return( ret );
}
ext_len += olen; ext_len += olen;
#endif #endif
@ -1039,46 +1073,91 @@ static int ssl_write_client_hello( mbedtls_ssl_context *ssl )
defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
if( uses_ec ) if( uses_ec )
{ {
ssl_write_supported_elliptic_curves_ext( ssl, p + 2 + ext_len, &olen ); if( ( ret = ssl_write_supported_elliptic_curves_ext( ssl, p + 2 + ext_len,
end, &olen ) ) != 0 )
{
MBEDTLS_SSL_DEBUG_RET( 1, "ssl_write_supported_elliptic_curves_ext", ret );
return( ret );
}
ext_len += olen; ext_len += olen;
ssl_write_supported_point_formats_ext( ssl, p + 2 + ext_len, &olen ); if( ( ret = ssl_write_supported_point_formats_ext( ssl, p + 2 + ext_len,
end, &olen ) ) != 0 )
{
MBEDTLS_SSL_DEBUG_RET( 1, "ssl_write_supported_point_formats_ext", ret );
return( ret );
}
ext_len += olen; ext_len += olen;
} }
#endif #endif
#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) #if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
ssl_write_ecjpake_kkpp_ext( ssl, p + 2 + ext_len, &olen ); if( ( ret = ssl_write_ecjpake_kkpp_ext( ssl, p + 2 + ext_len,
end, &olen ) ) != 0 )
{
MBEDTLS_SSL_DEBUG_RET( 1, "ssl_write_ecjpake_kkpp_ext", ret );
return( ret );
}
ext_len += olen; ext_len += olen;
#endif #endif
#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) #if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
ssl_write_max_fragment_length_ext( ssl, p + 2 + ext_len, &olen ); if( ( ret = ssl_write_max_fragment_length_ext( ssl, p + 2 + ext_len,
end, &olen ) ) != 0 )
{
MBEDTLS_SSL_DEBUG_RET( 1, "ssl_write_max_fragment_length_ext", ret );
return( ret );
}
ext_len += olen; ext_len += olen;
#endif #endif
#if defined(MBEDTLS_SSL_TRUNCATED_HMAC) #if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
ssl_write_truncated_hmac_ext( ssl, p + 2 + ext_len, &olen ); if( ( ret = ssl_write_truncated_hmac_ext( ssl, p + 2 + ext_len,
end, &olen ) ) != 0 )
{
MBEDTLS_SSL_DEBUG_RET( 1, "ssl_write_truncated_hmac_ext", ret );
return( ret );
}
ext_len += olen; ext_len += olen;
#endif #endif
#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
ssl_write_encrypt_then_mac_ext( ssl, p + 2 + ext_len, &olen ); if( ( ret = ssl_write_encrypt_then_mac_ext( ssl, p + 2 + ext_len,
end, &olen ) ) != 0 )
{
MBEDTLS_SSL_DEBUG_RET( 1, "ssl_write_encrypt_then_mac_ext", ret );
return( ret );
}
ext_len += olen; ext_len += olen;
#endif #endif
#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET) #if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
ssl_write_extended_ms_ext( ssl, p + 2 + ext_len, &olen ); if( ( ret = ssl_write_extended_ms_ext( ssl, p + 2 + ext_len,
end, &olen ) ) != 0 )
{
MBEDTLS_SSL_DEBUG_RET( 1, "ssl_write_extended_ms_ext", ret );
return( ret );
}
ext_len += olen; ext_len += olen;
#endif #endif
#if defined(MBEDTLS_SSL_ALPN) #if defined(MBEDTLS_SSL_ALPN)
ssl_write_alpn_ext( ssl, p + 2 + ext_len, &olen ); if( ( ret = ssl_write_alpn_ext( ssl, p + 2 + ext_len,
end, &olen ) ) != 0 )
{
MBEDTLS_SSL_DEBUG_RET( 1, "ssl_write_alpn_ext", ret );
return( ret );
}
ext_len += olen; ext_len += olen;
#endif #endif
#if defined(MBEDTLS_SSL_SESSION_TICKETS) #if defined(MBEDTLS_SSL_SESSION_TICKETS)
ssl_write_session_ticket_ext( ssl, p + 2 + ext_len, &olen ); if( ( ret = ssl_write_session_ticket_ext( ssl, p + 2 + ext_len,
end, &olen ) ) != 0 )
{
MBEDTLS_SSL_DEBUG_RET( 1, "ssl_write_session_ticket_ext", ret );
return( ret );
}
ext_len += olen; ext_len += olen;
#endif #endif
@ -1090,6 +1169,8 @@ static int ssl_write_client_hello( mbedtls_ssl_context *ssl )
if( ext_len > 0 ) if( ext_len > 0 )
{ {
/* No need to check for space here, because the extension
* writing functions already took care of that. */
*p++ = (unsigned char)( ( ext_len >> 8 ) & 0xFF ); *p++ = (unsigned char)( ( ext_len >> 8 ) & 0xFF );
*p++ = (unsigned char)( ( ext_len ) & 0xFF ); *p++ = (unsigned char)( ( ext_len ) & 0xFF );
p += ext_len; p += ext_len;

6
library/ssl_cookie.c
View File

@ -137,8 +137,7 @@ static int ssl_cookie_hmac( mbedtls_md_context_t *hmac_ctx,
{ {
unsigned char hmac_out[COOKIE_MD_OUTLEN]; unsigned char hmac_out[COOKIE_MD_OUTLEN];
if( (size_t)( end - *p ) < COOKIE_HMAC_LEN ) MBEDTLS_SSL_CHK_BUF_PTR( *p, end, COOKIE_HMAC_LEN );
return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
if( mbedtls_md_hmac_reset( hmac_ctx ) != 0 || if( mbedtls_md_hmac_reset( hmac_ctx ) != 0 ||
mbedtls_md_hmac_update( hmac_ctx, time, 4 ) != 0 || mbedtls_md_hmac_update( hmac_ctx, time, 4 ) != 0 ||
@ -168,8 +167,7 @@ int mbedtls_ssl_cookie_write( void *p_ctx,
if( ctx == NULL || cli_id == NULL ) if( ctx == NULL || cli_id == NULL )
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
if( (size_t)( end - *p ) < COOKIE_LEN ) MBEDTLS_SSL_CHK_BUF_PTR( *p, end, COOKIE_LEN );
return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
#if defined(MBEDTLS_HAVE_TIME) #if defined(MBEDTLS_HAVE_TIME)
t = (unsigned long) mbedtls_time( NULL ); t = (unsigned long) mbedtls_time( NULL );

4
library/ssl_ticket.c
View File

@ -35,6 +35,7 @@
#define mbedtls_free free #define mbedtls_free free
#endif #endif
#include "mbedtls/ssl_internal.h"
#include "mbedtls/ssl_ticket.h" #include "mbedtls/ssl_ticket.h"
#include <string.h> #include <string.h>
@ -320,8 +321,7 @@ int mbedtls_ssl_ticket_write( void *p_ticket,
/* We need at least 4 bytes for key_name, 12 for IV, 2 for len 16 for tag, /* We need at least 4 bytes for key_name, 12 for IV, 2 for len 16 for tag,
* in addition to session itself, that will be checked when writing it. */ * in addition to session itself, that will be checked when writing it. */
if( end - start < TICKET_MIN_LEN ) MBEDTLS_SSL_CHK_BUF_PTR( start, end, TICKET_MIN_LEN );
return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
#if defined(MBEDTLS_THREADING_C) #if defined(MBEDTLS_THREADING_C)
if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 ) if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 )