mirror of
https://github.com/Mbed-TLS/mbedtls.git
synced 2025-07-29 11:41:15 +03:00
TLS1.3: Add server finish processing in client side
Signed-off-by: XiaokangQian <xiaokang.qian@arm.com>
This commit is contained in:
@ -845,6 +845,159 @@ cleanup:
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return( ret );
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}
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/*
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*
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* STATE HANDLING: Incoming Finished
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* Overview
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*/
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/* Main entry point: orchestrates the other functions */
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int mbedtls_ssl_tls1_3_finished_in_process( mbedtls_ssl_context* ssl );
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static int ssl_finished_in_preprocess( mbedtls_ssl_context* ssl );
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static int ssl_finished_in_postprocess( mbedtls_ssl_context* ssl );
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static int ssl_finished_in_parse( mbedtls_ssl_context* ssl,
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const unsigned char* buf,
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size_t buflen );
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/*
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* Implementation
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*/
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int mbedtls_ssl_tls1_3_finished_in_process( mbedtls_ssl_context* ssl )
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{
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int ret = 0;
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unsigned char *buf;
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size_t buflen;
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MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse finished" ) );
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/* Preprocessing step: Compute handshake digest */
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MBEDTLS_SSL_PROC_CHK( ssl_finished_in_preprocess( ssl ) );
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MBEDTLS_SSL_PROC_CHK( mbedtls_ssl_tls1_3_fetch_handshake_msg( ssl,
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MBEDTLS_SSL_HS_FINISHED,
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&buf, &buflen ) );
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MBEDTLS_SSL_PROC_CHK( ssl_finished_in_parse( ssl, buf, buflen ) );
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mbedtls_ssl_tls1_3_add_hs_msg_to_checksum(
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ssl, MBEDTLS_SSL_HS_FINISHED, buf, buflen );
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MBEDTLS_SSL_PROC_CHK( ssl_finished_in_postprocess( ssl ) );
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cleanup:
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MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse finished" ) );
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return( ret );
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}
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static int ssl_finished_in_preprocess( mbedtls_ssl_context* ssl )
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{
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int ret;
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ret = mbedtls_ssl_tls1_3_calc_finished( ssl,
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ssl->handshake->state_local.finished_in.digest,
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sizeof( ssl->handshake->state_local.finished_in.digest ),
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&ssl->handshake->state_local.finished_in.digest_len,
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ssl->conf->endpoint ^ 1 );
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if( ret != 0 )
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{
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MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_tls1_3_calc_finished", ret );
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return( ret );
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}
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return( 0 );
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}
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static int ssl_finished_in_parse( mbedtls_ssl_context* ssl,
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const unsigned char* buf,
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size_t buflen )
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{
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/* Structural validation */
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if( buflen != ssl->handshake->state_local.finished_in.digest_len )
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{
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MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad finished message" ) );
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MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR,
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MBEDTLS_ERR_SSL_DECODE_ERROR );
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return( MBEDTLS_ERR_SSL_DECODE_ERROR );
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}
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MBEDTLS_SSL_DEBUG_BUF( 4, "Hash (self-computed):",
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ssl->handshake->state_local.finished_in.digest,
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ssl->handshake->state_local.finished_in.digest_len );
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MBEDTLS_SSL_DEBUG_BUF( 4, "Hash (received message):", buf,
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ssl->handshake->state_local.finished_in.digest_len );
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/* Semantic validation */
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if( mbedtls_ssl_safer_memcmp( buf,
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ssl->handshake->state_local.finished_in.digest,
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ssl->handshake->state_local.finished_in.digest_len ) != 0 )
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{
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MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad finished message" ) );
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MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR,
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MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE );
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return( MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE );
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}
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return( 0 );
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}
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static int ssl_finished_in_postprocess_cli( mbedtls_ssl_context *ssl )
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{
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int ret = 0;
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mbedtls_ssl_key_set traffic_keys;
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mbedtls_ssl_transform *transform_application;
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ret = mbedtls_ssl_tls1_3_key_schedule_stage_application( ssl );
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if( ret != 0 )
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{
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MBEDTLS_SSL_DEBUG_RET( 1,
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"mbedtls_ssl_tls1_3_key_schedule_stage_application", ret );
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return( ret );
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}
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ret = mbedtls_ssl_tls1_3_generate_application_keys(
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ssl, &traffic_keys );
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if( ret != 0 )
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{
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MBEDTLS_SSL_DEBUG_RET( 1,
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"mbedtls_ssl_tls1_3_generate_application_keys", ret );
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return( ret );
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}
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transform_application =
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mbedtls_calloc( 1, sizeof( mbedtls_ssl_transform ) );
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if( transform_application == NULL )
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return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
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ret = mbedtls_ssl_tls13_populate_transform(
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transform_application,
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ssl->conf->endpoint,
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ssl->session_negotiate->ciphersuite,
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&traffic_keys,
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ssl );
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if( ret != 0 )
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{
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MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_tls13_populate_transform", ret );
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return( ret );
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}
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ssl->transform_application = transform_application;
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mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_END_OF_EARLY_DATA );
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return( 0 );
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}
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static int ssl_finished_in_postprocess( mbedtls_ssl_context* ssl )
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{
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if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT )
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{
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return( ssl_finished_in_postprocess_cli( ssl ) );
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}
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return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
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}
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#endif /* MBEDTLS_SSL_PROTO_TLS1_3_EXPERIMENTAL */
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#endif /* MBEDTLS_SSL_TLS_C */
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