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Fix non compliance SSLv3 in server extension handling.

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The server code parses the client hello extensions even when the
protocol is SSLv3 and this behaviour is non compliant with rfc6101.
Also the server sends extensions in the server hello and omitting
them may prevent interoperability problems.
This commit is contained in:
Janos Follath 2016-05-23 14:27:02 +01:00 committed by Simon Butcher
parent b700c46750
commit 83f26052bf
2 changed files with 23 additions and 0 deletions
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2
ChangeLog
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@ -20,6 +20,8 @@ Changes
* On ARM platforms, when compiling with -O0 with GCC, Clang or armcc5, * On ARM platforms, when compiling with -O0 with GCC, Clang or armcc5,
don't use the optimized assembly for bignum multiplication. This removes don't use the optimized assembly for bignum multiplication. This removes
the need to pass -fomit-frame-pointer to avoid a build error with -O0. the need to pass -fomit-frame-pointer to avoid a build error with -O0.
* Fix non-compliance server extension handling. Extensions for SSLv3 are now
ignored, as required by RFC6101.
= mbed TLS 2.1.4 released 2016-01-05 = mbed TLS 2.1.4 released 2016-01-05

21
library/ssl_srv.c
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@ -1460,6 +1460,12 @@ read_record_header:
ssl->session_negotiate->compression = MBEDTLS_SSL_COMPRESS_NULL; ssl->session_negotiate->compression = MBEDTLS_SSL_COMPRESS_NULL;
#endif #endif
/* Do not parse the extensions if the protocol is SSLv3 */
#if defined(MBEDTLS_SSL_PROTO_SSL3)
if( ( ssl->major_ver != 3 ) || ( ssl->minor_ver != 0 ) )
{
#endif
/* /*
* Check the extension length * Check the extension length
*/ */
@ -1633,8 +1639,13 @@ read_record_header:
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
} }
} }
#if defined(MBEDTLS_SSL_PROTO_SSL3)
}
#endif
#if defined(MBEDTLS_SSL_FALLBACK_SCSV) #if defined(MBEDTLS_SSL_FALLBACK_SCSV)
for( i = 0, p = buf + 41 + sess_len; i < ciph_len; i += 2, p += 2 ) for( i = 0, p = buf + 41 + sess_len; i < ciph_len; i += 2, p += 2 )
{ {
@ -2259,6 +2270,12 @@ static int ssl_write_server_hello( mbedtls_ssl_context *ssl )
MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, compress alg.: 0x%02X", MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, compress alg.: 0x%02X",
ssl->session_negotiate->compression ) ); ssl->session_negotiate->compression ) );
/* Do not write the extensions if the protocol is SSLv3 */
#if defined(MBEDTLS_SSL_PROTO_SSL3)
if( ( ssl->major_ver != 3 ) || ( ssl->minor_ver != 0 ) )
{
#endif
/* /*
* First write extensions, then the total length * First write extensions, then the total length
*/ */
@ -2309,6 +2326,10 @@ static int ssl_write_server_hello( mbedtls_ssl_context *ssl )
p += ext_len; p += ext_len;
} }
#if defined(MBEDTLS_SSL_PROTO_SSL3)
}
#endif
ssl->out_msglen = p - buf; ssl->out_msglen = p - buf;
ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE; ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
ssl->out_msg[0] = MBEDTLS_SSL_HS_SERVER_HELLO; ssl->out_msg[0] = MBEDTLS_SSL_HS_SERVER_HELLO;