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Merge remote-tracking branch 'public/pr/1852' into development
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Simon Butcher
commit
116ac43d00
10
ChangeLog
10
ChangeLog
@ -37,6 +37,16 @@ Bugfix
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* Fix compiler warning of 'use before initialisation' in
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mbedtls_pk_parse_key(). Found by Martin Boye Petersen and fixed by Dawid
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Drozd. #1098
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* Fix decryption of zero length messages (all padding) in some circumstances:
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DTLS 1.0 and 1.2, and CBC ciphersuites using encrypt-then-MAC. Most often
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seen when communicating with OpenSSL using TLS 1.0. Reported by @kFYatek
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(#1632) and by Conor Murphy on the forum. Fix contributed by Espressif
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Systems.
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* Fail when receiving a TLS alert message with an invalid length, or invalid
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zero-length messages when using TLS 1.2. Contributed by Espressif Systems.
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* Fix ssl_client2 example to send application data with 0-length content
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when the request_size argument is set to 0 as stated in the documentation.
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Fixes #1833.
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Changes
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* Change the shebang line in Perl scripts to look up perl in the PATH.
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@ -1979,28 +1979,28 @@ static int ssl_decrypt_buf( mbedtls_ssl_context *ssl )
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* and fake check up to 256 bytes of padding
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*/
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size_t pad_count = 0, real_count = 1;
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size_t padding_idx = ssl->in_msglen - padlen - 1;
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size_t padding_idx = ssl->in_msglen - padlen;
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size_t i;
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/*
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* Padding is guaranteed to be incorrect if:
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* 1. padlen >= ssl->in_msglen
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* 1. padlen > ssl->in_msglen
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*
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* 2. padding_idx >= MBEDTLS_SSL_IN_CONTENT_LEN +
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* 2. padding_idx > MBEDTLS_SSL_IN_CONTENT_LEN +
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* ssl->transform_in->maclen
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*
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* In both cases we reset padding_idx to a safe value (0) to
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* prevent out-of-buffer reads.
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*/
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correct &= ( ssl->in_msglen >= padlen + 1 );
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correct &= ( padding_idx < MBEDTLS_SSL_IN_CONTENT_LEN +
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correct &= ( padlen <= ssl->in_msglen );
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correct &= ( padding_idx <= MBEDTLS_SSL_IN_CONTENT_LEN +
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ssl->transform_in->maclen );
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padding_idx *= correct;
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for( i = 1; i <= 256; i++ )
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for( i = 0; i < 256; i++ )
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{
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real_count &= ( i <= padlen );
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real_count &= ( i < padlen );
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pad_count += real_count *
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( ssl->in_msg[padding_idx + i] == padlen - 1 );
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}
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@ -2133,6 +2133,16 @@ static int ssl_decrypt_buf( mbedtls_ssl_context *ssl )
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if( ssl->in_msglen == 0 )
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{
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#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
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if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3
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&& ssl->in_msgtype != MBEDTLS_SSL_MSG_APPLICATION_DATA )
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{
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/* TLS v1.2 explicitly disallows zero-length messages which are not application data */
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MBEDTLS_SSL_DEBUG_MSG( 1, ( "invalid zero-length message type: %d", ssl->in_msgtype ) );
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return( MBEDTLS_ERR_SSL_INVALID_RECORD );
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}
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#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
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ssl->nb_zero++;
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/*
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@ -4177,6 +4187,16 @@ int mbedtls_ssl_handle_message_type( mbedtls_ssl_context *ssl )
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if( ssl->in_msgtype == MBEDTLS_SSL_MSG_ALERT )
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{
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if( ssl->in_msglen != 2 )
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{
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/* Note: Standard allows for more than one 2 byte alert
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to be packed in a single message, but Mbed TLS doesn't
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currently support this. */
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MBEDTLS_SSL_DEBUG_MSG( 1, ( "invalid alert message, len: %d",
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ssl->in_msglen ) );
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return( MBEDTLS_ERR_SSL_INVALID_RECORD );
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}
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MBEDTLS_SSL_DEBUG_MSG( 2, ( "got an alert message, type: [%d:%d]",
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ssl->in_msg[0], ssl->in_msg[1] ) );
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@ -246,8 +246,12 @@ int main( void )
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" server_addr=%%s default: given by name\n" \
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" server_port=%%d default: 4433\n" \
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" request_page=%%s default: \".\"\n" \
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" request_size=%%d default: about 34 (basic request)\n" \
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" (minimum: 0, max: " MAX_REQUEST_SIZE_STR " )\n" \
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" request_size=%%d default: about 34 (basic request)\n" \
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" (minimum: 0, max: " MAX_REQUEST_SIZE_STR ")\n" \
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" If 0, in the first exchange only an empty\n" \
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" application data message is sent followed by\n" \
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" a second non-empty message before attempting\n" \
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" to read a response from the server\n" \
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" debug_level=%%d default: 0 (disabled)\n" \
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" nbio=%%d default: 0 (blocking I/O)\n" \
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" options: 1 (non-blocking), 2 (added delays)\n" \
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@ -1663,10 +1667,13 @@ send_request:
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if( opt.transport == MBEDTLS_SSL_TRANSPORT_STREAM )
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{
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for( written = 0, frags = 0; written < len; written += ret, frags++ )
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written = 0;
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frags = 0;
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do
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{
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while( ( ret = mbedtls_ssl_write( &ssl, buf + written,
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len - written ) ) <= 0 )
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len - written ) ) < 0 )
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{
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if( ret != MBEDTLS_ERR_SSL_WANT_READ &&
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ret != MBEDTLS_ERR_SSL_WANT_WRITE )
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@ -1686,7 +1693,11 @@ send_request:
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#endif
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}
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}
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frags++;
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written += ret;
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}
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while( written < len );
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}
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else /* Not stream, so datagram */
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{
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@ -1730,6 +1741,13 @@ send_request:
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mbedtls_printf( " %d bytes written in %d fragments\n\n%s\n",
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written, frags, (char *) buf );
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/* Send a non-empty request if request_size == 0 */
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if ( len == 0 )
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{
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opt.request_size = DFL_REQUEST_SIZE;
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goto send_request;
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}
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/*
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* 7. Read the HTTP response
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*/
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@ -1170,6 +1170,38 @@ run_test "Fallback SCSV: enabled, max version, openssl client" \
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-s "received FALLBACK_SCSV" \
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-S "inapropriate fallback"
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# Test sending and receiving empty application data records
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run_test "Encrypt then MAC: empty application data record" \
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"$P_SRV auth_mode=none debug_level=4 etm=1" \
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"$P_CLI auth_mode=none etm=1 request_size=0 force_ciphersuite=TLS-ECDHE-RSA-WITH-AES-256-CBC-SHA" \
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0 \
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-S "0000: 0f 0f 0f 0f 0f 0f 0f 0f 0f 0f 0f 0f 0f 0f 0f 0f" \
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-s "dumping 'input payload after decrypt' (0 bytes)" \
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-c "0 bytes written in 1 fragments"
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run_test "Default, no Encrypt then MAC: empty application data record" \
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"$P_SRV auth_mode=none debug_level=4 etm=0" \
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"$P_CLI auth_mode=none etm=0 request_size=0" \
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0 \
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-s "dumping 'input payload after decrypt' (0 bytes)" \
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-c "0 bytes written in 1 fragments"
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run_test "Encrypt then MAC, DTLS: empty application data record" \
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"$P_SRV auth_mode=none debug_level=4 etm=1 dtls=1" \
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"$P_CLI auth_mode=none etm=1 request_size=0 force_ciphersuite=TLS-ECDHE-RSA-WITH-AES-256-CBC-SHA dtls=1" \
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0 \
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-S "0000: 0f 0f 0f 0f 0f 0f 0f 0f 0f 0f 0f 0f 0f 0f 0f 0f" \
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-s "dumping 'input payload after decrypt' (0 bytes)" \
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-c "0 bytes written in 1 fragments"
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run_test "Default, no Encrypt then MAC, DTLS: empty application data record" \
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"$P_SRV auth_mode=none debug_level=4 etm=0 dtls=1" \
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"$P_CLI auth_mode=none etm=0 request_size=0 dtls=1" \
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0 \
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-s "dumping 'input payload after decrypt' (0 bytes)" \
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-c "0 bytes written in 1 fragments"
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## ClientHello generated with
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## "openssl s_client -CAfile tests/data_files/test-ca.crt -tls1_1 -connect localhost:4433 -cipher ..."
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## then manually twiddling the ciphersuite list.
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