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- /*
- * SSLv3/TLSv1 server-side functions
- *
- * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
- * SPDX-License-Identifier: Apache-2.0
- *
- * Licensed under the Apache License, Version 2.0 (the "License"); you may
- * not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
- * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- *
- * This file is part of mbed TLS (https://tls.mbed.org)
- */
- #if !defined(MBEDTLS_CONFIG_FILE)
- #include "mbedtls/config.h"
- #else
- #include MBEDTLS_CONFIG_FILE
- #endif
- #if defined(MBEDTLS_SSL_SRV_C)
- #if defined(MBEDTLS_PLATFORM_C)
- #include "mbedtls/platform.h"
- #else
- #include <stdlib.h>
- #define mbedtls_calloc calloc
- #define mbedtls_free free
- #endif
- #include "mbedtls/debug.h"
- #include "mbedtls/ssl.h"
- #include "mbedtls/ssl_internal.h"
- #include <string.h>
- #if defined(MBEDTLS_ECP_C)
- #include "mbedtls/ecp.h"
- #endif
- #if defined(MBEDTLS_HAVE_TIME)
- #include "mbedtls/platform_time.h"
- #endif
- #if defined(MBEDTLS_SSL_SESSION_TICKETS)
- /* Implementation that should never be optimized out by the compiler */
- static void mbedtls_zeroize( void *v, size_t n ) {
- volatile unsigned char *p = v; while( n-- ) *p++ = 0;
- }
- #endif
- #if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY)
- int mbedtls_ssl_set_client_transport_id( mbedtls_ssl_context *ssl,
- const unsigned char *info,
- size_t ilen )
- {
- if( ssl->conf->endpoint != MBEDTLS_SSL_IS_SERVER )
- return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
- mbedtls_free( ssl->cli_id );
- if( ( ssl->cli_id = mbedtls_calloc( 1, ilen ) ) == NULL )
- return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
- memcpy( ssl->cli_id, info, ilen );
- ssl->cli_id_len = ilen;
- return( 0 );
- }
- void mbedtls_ssl_conf_dtls_cookies( mbedtls_ssl_config *conf,
- mbedtls_ssl_cookie_write_t *f_cookie_write,
- mbedtls_ssl_cookie_check_t *f_cookie_check,
- void *p_cookie )
- {
- conf->f_cookie_write = f_cookie_write;
- conf->f_cookie_check = f_cookie_check;
- conf->p_cookie = p_cookie;
- }
- #endif /* MBEDTLS_SSL_DTLS_HELLO_VERIFY */
- #if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
- static int ssl_parse_servername_ext( mbedtls_ssl_context *ssl,
- const unsigned char *buf,
- size_t len )
- {
- int ret;
- size_t servername_list_size, hostname_len;
- const unsigned char *p;
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "parse ServerName extension" ) );
- if( len < 2 )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
- mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
- MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
- }
- servername_list_size = ( ( buf[0] << 8 ) | ( buf[1] ) );
- if( servername_list_size + 2 != len )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
- mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
- MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
- }
- p = buf + 2;
- while( servername_list_size > 2 )
- {
- hostname_len = ( ( p[1] << 8 ) | p[2] );
- if( hostname_len + 3 > servername_list_size )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
- mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
- MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
- }
- if( p[0] == MBEDTLS_TLS_EXT_SERVERNAME_HOSTNAME )
- {
- ret = ssl->conf->f_sni( ssl->conf->p_sni,
- ssl, p + 3, hostname_len );
- if( ret != 0 )
- {
- MBEDTLS_SSL_DEBUG_RET( 1, "ssl_sni_wrapper", ret );
- mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
- MBEDTLS_SSL_ALERT_MSG_UNRECOGNIZED_NAME );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
- }
- return( 0 );
- }
- servername_list_size -= hostname_len + 3;
- p += hostname_len + 3;
- }
- if( servername_list_size != 0 )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
- mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
- MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
- }
- return( 0 );
- }
- #endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */
- static int ssl_parse_renegotiation_info( mbedtls_ssl_context *ssl,
- const unsigned char *buf,
- size_t len )
- {
- #if defined(MBEDTLS_SSL_RENEGOTIATION)
- if( ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE )
- {
- /* Check verify-data in constant-time. The length OTOH is no secret */
- if( len != 1 + ssl->verify_data_len ||
- buf[0] != ssl->verify_data_len ||
- mbedtls_ssl_safer_memcmp( buf + 1, ssl->peer_verify_data,
- ssl->verify_data_len ) != 0 )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "non-matching renegotiation info" ) );
- mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
- MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
- }
- }
- else
- #endif /* MBEDTLS_SSL_RENEGOTIATION */
- {
- if( len != 1 || buf[0] != 0x0 )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "non-zero length renegotiation info" ) );
- mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
- MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
- }
- ssl->secure_renegotiation = MBEDTLS_SSL_SECURE_RENEGOTIATION;
- }
- return( 0 );
- }
- #if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \
- defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
- /*
- * Status of the implementation of signature-algorithms extension:
- *
- * Currently, we are only considering the signature-algorithm extension
- * to pick a ciphersuite which allows us to send the ServerKeyExchange
- * message with a signature-hash combination that the user allows.
- *
- * We do *not* check whether all certificates in our certificate
- * chain are signed with an allowed signature-hash pair.
- * This needs to be done at a later stage.
- *
- */
- static int ssl_parse_signature_algorithms_ext( mbedtls_ssl_context *ssl,
- const unsigned char *buf,
- size_t len )
- {
- size_t sig_alg_list_size;
- const unsigned char *p;
- const unsigned char *end = buf + len;
- mbedtls_md_type_t md_cur;
- mbedtls_pk_type_t sig_cur;
- if ( len < 2 ) {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
- mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
- MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
- }
- sig_alg_list_size = ( ( buf[0] << 8 ) | ( buf[1] ) );
- if( sig_alg_list_size + 2 != len ||
- sig_alg_list_size % 2 != 0 )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
- mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
- MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
- }
- /* Currently we only guarantee signing the ServerKeyExchange message according
- * to the constraints specified in this extension (see above), so it suffices
- * to remember only one suitable hash for each possible signature algorithm.
- *
- * This will change when we also consider certificate signatures,
- * in which case we will need to remember the whole signature-hash
- * pair list from the extension.
- */
- for( p = buf + 2; p < end; p += 2 )
- {
- /* Silently ignore unknown signature or hash algorithms. */
- if( ( sig_cur = mbedtls_ssl_pk_alg_from_sig( p[1] ) ) == MBEDTLS_PK_NONE )
- {
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, signature_algorithm ext"
- " unknown sig alg encoding %d", p[1] ) );
- continue;
- }
- /* Check if we support the hash the user proposes */
- md_cur = mbedtls_ssl_md_alg_from_hash( p[0] );
- if( md_cur == MBEDTLS_MD_NONE )
- {
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, signature_algorithm ext:"
- " unknown hash alg encoding %d", p[0] ) );
- continue;
- }
- if( mbedtls_ssl_check_sig_hash( ssl, md_cur ) == 0 )
- {
- mbedtls_ssl_sig_hash_set_add( &ssl->handshake->hash_algs, sig_cur, md_cur );
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, signature_algorithm ext:"
- " match sig %d and hash %d",
- sig_cur, md_cur ) );
- }
- else
- {
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, signature_algorithm ext: "
- "hash alg %d not supported", md_cur ) );
- }
- }
- return( 0 );
- }
- #endif /* MBEDTLS_SSL_PROTO_TLS1_2 &&
- MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */
- #if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \
- defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
- static int ssl_parse_supported_elliptic_curves( mbedtls_ssl_context *ssl,
- const unsigned char *buf,
- size_t len )
- {
- size_t list_size, our_size;
- const unsigned char *p;
- const mbedtls_ecp_curve_info *curve_info, **curves;
- if ( len < 2 ) {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
- mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
- MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
- }
- list_size = ( ( buf[0] << 8 ) | ( buf[1] ) );
- if( list_size + 2 != len ||
- list_size % 2 != 0 )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
- mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
- MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
- }
- /* Should never happen unless client duplicates the extension */
- if( ssl->handshake->curves != NULL )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
- mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
- MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
- }
- /* Don't allow our peer to make us allocate too much memory,
- * and leave room for a final 0 */
- our_size = list_size / 2 + 1;
- if( our_size > MBEDTLS_ECP_DP_MAX )
- our_size = MBEDTLS_ECP_DP_MAX;
- if( ( curves = mbedtls_calloc( our_size, sizeof( *curves ) ) ) == NULL )
- {
- mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
- MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR );
- return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
- }
- ssl->handshake->curves = curves;
- p = buf + 2;
- while( list_size > 0 && our_size > 1 )
- {
- curve_info = mbedtls_ecp_curve_info_from_tls_id( ( p[0] << 8 ) | p[1] );
- if( curve_info != NULL )
- {
- *curves++ = curve_info;
- our_size--;
- }
- list_size -= 2;
- p += 2;
- }
- return( 0 );
- }
- static int ssl_parse_supported_point_formats( mbedtls_ssl_context *ssl,
- const unsigned char *buf,
- size_t len )
- {
- size_t list_size;
- const unsigned char *p;
- if( len == 0 || (size_t)( buf[0] + 1 ) != len )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
- mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
- MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
- }
- list_size = buf[0];
- p = buf + 1;
- while( list_size > 0 )
- {
- if( p[0] == MBEDTLS_ECP_PF_UNCOMPRESSED ||
- p[0] == MBEDTLS_ECP_PF_COMPRESSED )
- {
- #if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C)
- ssl->handshake->ecdh_ctx.point_format = p[0];
- #endif
- #if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
- ssl->handshake->ecjpake_ctx.point_format = p[0];
- #endif
- MBEDTLS_SSL_DEBUG_MSG( 4, ( "point format selected: %d", p[0] ) );
- return( 0 );
- }
- list_size--;
- p++;
- }
- return( 0 );
- }
- #endif /* MBEDTLS_ECDH_C || MBEDTLS_ECDSA_C ||
- MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
- #if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
- static int ssl_parse_ecjpake_kkpp( mbedtls_ssl_context *ssl,
- const unsigned char *buf,
- size_t len )
- {
- int ret;
- if( mbedtls_ecjpake_check( &ssl->handshake->ecjpake_ctx ) != 0 )
- {
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "skip ecjpake kkpp extension" ) );
- return( 0 );
- }
- if( ( ret = mbedtls_ecjpake_read_round_one( &ssl->handshake->ecjpake_ctx,
- buf, len ) ) != 0 )
- {
- MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecjpake_read_round_one", ret );
- mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
- MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER );
- return( ret );
- }
- /* Only mark the extension as OK when we're sure it is */
- ssl->handshake->cli_exts |= MBEDTLS_TLS_EXT_ECJPAKE_KKPP_OK;
- return( 0 );
- }
- #endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
- #if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
- static int ssl_parse_max_fragment_length_ext( mbedtls_ssl_context *ssl,
- const unsigned char *buf,
- size_t len )
- {
- if( len != 1 || buf[0] >= MBEDTLS_SSL_MAX_FRAG_LEN_INVALID )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
- mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
- MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
- }
- ssl->session_negotiate->mfl_code = buf[0];
- return( 0 );
- }
- #endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
- #if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
- static int ssl_parse_truncated_hmac_ext( mbedtls_ssl_context *ssl,
- const unsigned char *buf,
- size_t len )
- {
- if( len != 0 )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
- mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
- MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
- }
- ((void) buf);
- if( ssl->conf->trunc_hmac == MBEDTLS_SSL_TRUNC_HMAC_ENABLED )
- ssl->session_negotiate->trunc_hmac = MBEDTLS_SSL_TRUNC_HMAC_ENABLED;
- return( 0 );
- }
- #endif /* MBEDTLS_SSL_TRUNCATED_HMAC */
- #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
- static int ssl_parse_encrypt_then_mac_ext( mbedtls_ssl_context *ssl,
- const unsigned char *buf,
- size_t len )
- {
- if( len != 0 )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
- mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
- MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
- }
- ((void) buf);
- if( ssl->conf->encrypt_then_mac == MBEDTLS_SSL_ETM_ENABLED &&
- ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_0 )
- {
- ssl->session_negotiate->encrypt_then_mac = MBEDTLS_SSL_ETM_ENABLED;
- }
- return( 0 );
- }
- #endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */
- #if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
- static int ssl_parse_extended_ms_ext( mbedtls_ssl_context *ssl,
- const unsigned char *buf,
- size_t len )
- {
- if( len != 0 )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
- mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
- MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
- }
- ((void) buf);
- if( ssl->conf->extended_ms == MBEDTLS_SSL_EXTENDED_MS_ENABLED &&
- ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_0 )
- {
- ssl->handshake->extended_ms = MBEDTLS_SSL_EXTENDED_MS_ENABLED;
- }
- return( 0 );
- }
- #endif /* MBEDTLS_SSL_EXTENDED_MASTER_SECRET */
- #if defined(MBEDTLS_SSL_SESSION_TICKETS)
- static int ssl_parse_session_ticket_ext( mbedtls_ssl_context *ssl,
- unsigned char *buf,
- size_t len )
- {
- int ret;
- mbedtls_ssl_session session;
- mbedtls_ssl_session_init( &session );
- if( ssl->conf->f_ticket_parse == NULL ||
- ssl->conf->f_ticket_write == NULL )
- {
- return( 0 );
- }
- /* Remember the client asked us to send a new ticket */
- ssl->handshake->new_session_ticket = 1;
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "ticket length: %d", len ) );
- if( len == 0 )
- return( 0 );
- #if defined(MBEDTLS_SSL_RENEGOTIATION)
- if( ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE )
- {
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "ticket rejected: renegotiating" ) );
- return( 0 );
- }
- #endif /* MBEDTLS_SSL_RENEGOTIATION */
- /*
- * Failures are ok: just ignore the ticket and proceed.
- */
- if( ( ret = ssl->conf->f_ticket_parse( ssl->conf->p_ticket, &session,
- buf, len ) ) != 0 )
- {
- mbedtls_ssl_session_free( &session );
- if( ret == MBEDTLS_ERR_SSL_INVALID_MAC )
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "ticket is not authentic" ) );
- else if( ret == MBEDTLS_ERR_SSL_SESSION_TICKET_EXPIRED )
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "ticket is expired" ) );
- else
- MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_ticket_parse", ret );
- return( 0 );
- }
- /*
- * Keep the session ID sent by the client, since we MUST send it back to
- * inform them we're accepting the ticket (RFC 5077 section 3.4)
- */
- session.id_len = ssl->session_negotiate->id_len;
- memcpy( &session.id, ssl->session_negotiate->id, session.id_len );
- mbedtls_ssl_session_free( ssl->session_negotiate );
- memcpy( ssl->session_negotiate, &session, sizeof( mbedtls_ssl_session ) );
- /* Zeroize instead of free as we copied the content */
- mbedtls_zeroize( &session, sizeof( mbedtls_ssl_session ) );
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "session successfully restored from ticket" ) );
- ssl->handshake->resume = 1;
- /* Don't send a new ticket after all, this one is OK */
- ssl->handshake->new_session_ticket = 0;
- return( 0 );
- }
- #endif /* MBEDTLS_SSL_SESSION_TICKETS */
- #if defined(MBEDTLS_SSL_ALPN)
- static int ssl_parse_alpn_ext( mbedtls_ssl_context *ssl,
- const unsigned char *buf, size_t len )
- {
- size_t list_len, cur_len, ours_len;
- const unsigned char *theirs, *start, *end;
- const char **ours;
- /* If ALPN not configured, just ignore the extension */
- if( ssl->conf->alpn_list == NULL )
- return( 0 );
- /*
- * opaque ProtocolName<1..2^8-1>;
- *
- * struct {
- * ProtocolName protocol_name_list<2..2^16-1>
- * } ProtocolNameList;
- */
- /* Min length is 2 (list_len) + 1 (name_len) + 1 (name) */
- if( len < 4 )
- {
- mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
- MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
- }
- list_len = ( buf[0] << 8 ) | buf[1];
- if( list_len != len - 2 )
- {
- mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
- MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
- }
- /*
- * Validate peer's list (lengths)
- */
- start = buf + 2;
- end = buf + len;
- for( theirs = start; theirs != end; theirs += cur_len )
- {
- cur_len = *theirs++;
- /* Current identifier must fit in list */
- if( cur_len > (size_t)( end - theirs ) )
- {
- mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
- MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
- }
- /* Empty strings MUST NOT be included */
- if( cur_len == 0 )
- {
- mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
- MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
- }
- }
- /*
- * Use our order of preference
- */
- for( ours = ssl->conf->alpn_list; *ours != NULL; ours++ )
- {
- ours_len = strlen( *ours );
- for( theirs = start; theirs != end; theirs += cur_len )
- {
- cur_len = *theirs++;
- if( cur_len == ours_len &&
- memcmp( theirs, *ours, cur_len ) == 0 )
- {
- ssl->alpn_chosen = *ours;
- return( 0 );
- }
- }
- }
- /* If we get there, no match was found */
- mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
- MBEDTLS_SSL_ALERT_MSG_NO_APPLICATION_PROTOCOL );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
- }
- #endif /* MBEDTLS_SSL_ALPN */
- /*
- * Auxiliary functions for ServerHello parsing and related actions
- */
- #if defined(MBEDTLS_X509_CRT_PARSE_C)
- /*
- * Return 0 if the given key uses one of the acceptable curves, -1 otherwise
- */
- #if defined(MBEDTLS_ECDSA_C)
- static int ssl_check_key_curve( mbedtls_pk_context *pk,
- const mbedtls_ecp_curve_info **curves )
- {
- const mbedtls_ecp_curve_info **crv = curves;
- mbedtls_ecp_group_id grp_id = mbedtls_pk_ec( *pk )->grp.id;
- while( *crv != NULL )
- {
- if( (*crv)->grp_id == grp_id )
- return( 0 );
- crv++;
- }
- return( -1 );
- }
- #endif /* MBEDTLS_ECDSA_C */
- /*
- * Try picking a certificate for this ciphersuite,
- * return 0 on success and -1 on failure.
- */
- static int ssl_pick_cert( mbedtls_ssl_context *ssl,
- const mbedtls_ssl_ciphersuite_t * ciphersuite_info )
- {
- mbedtls_ssl_key_cert *cur, *list, *fallback = NULL;
- mbedtls_pk_type_t pk_alg =
- mbedtls_ssl_get_ciphersuite_sig_pk_alg( ciphersuite_info );
- uint32_t flags;
- #if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
- if( ssl->handshake->sni_key_cert != NULL )
- list = ssl->handshake->sni_key_cert;
- else
- #endif
- list = ssl->conf->key_cert;
- if( pk_alg == MBEDTLS_PK_NONE )
- return( 0 );
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite requires certificate" ) );
- if( list == NULL )
- {
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "server has no certificate" ) );
- return( -1 );
- }
- for( cur = list; cur != NULL; cur = cur->next )
- {
- MBEDTLS_SSL_DEBUG_CRT( 3, "candidate certificate chain, certificate",
- cur->cert );
- if( ! mbedtls_pk_can_do( cur->key, pk_alg ) )
- {
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "certificate mismatch: key type" ) );
- continue;
- }
- /*
- * This avoids sending the client a cert it'll reject based on
- * keyUsage or other extensions.
- *
- * It also allows the user to provision different certificates for
- * different uses based on keyUsage, eg if they want to avoid signing
- * and decrypting with the same RSA key.
- */
- if( mbedtls_ssl_check_cert_usage( cur->cert, ciphersuite_info,
- MBEDTLS_SSL_IS_SERVER, &flags ) != 0 )
- {
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "certificate mismatch: "
- "(extended) key usage extension" ) );
- continue;
- }
- #if defined(MBEDTLS_ECDSA_C)
- if( pk_alg == MBEDTLS_PK_ECDSA &&
- ssl_check_key_curve( cur->key, ssl->handshake->curves ) != 0 )
- {
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "certificate mismatch: elliptic curve" ) );
- continue;
- }
- #endif
- /*
- * Try to select a SHA-1 certificate for pre-1.2 clients, but still
- * present them a SHA-higher cert rather than failing if it's the only
- * one we got that satisfies the other conditions.
- */
- if( ssl->minor_ver < MBEDTLS_SSL_MINOR_VERSION_3 &&
- cur->cert->sig_md != MBEDTLS_MD_SHA1 )
- {
- if( fallback == NULL )
- fallback = cur;
- {
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "certificate not preferred: "
- "sha-2 with pre-TLS 1.2 client" ) );
- continue;
- }
- }
- /* If we get there, we got a winner */
- break;
- }
- if( cur == NULL )
- cur = fallback;
- /* Do not update ssl->handshake->key_cert unless there is a match */
- if( cur != NULL )
- {
- ssl->handshake->key_cert = cur;
- MBEDTLS_SSL_DEBUG_CRT( 3, "selected certificate chain, certificate",
- ssl->handshake->key_cert->cert );
- return( 0 );
- }
- return( -1 );
- }
- #endif /* MBEDTLS_X509_CRT_PARSE_C */
- /*
- * Check if a given ciphersuite is suitable for use with our config/keys/etc
- * Sets ciphersuite_info only if the suite matches.
- */
- static int ssl_ciphersuite_match( mbedtls_ssl_context *ssl, int suite_id,
- const mbedtls_ssl_ciphersuite_t **ciphersuite_info )
- {
- const mbedtls_ssl_ciphersuite_t *suite_info;
- #if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \
- defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
- mbedtls_pk_type_t sig_type;
- #endif
- suite_info = mbedtls_ssl_ciphersuite_from_id( suite_id );
- if( suite_info == NULL )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
- return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
- }
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "trying ciphersuite: %s", suite_info->name ) );
- if( suite_info->min_minor_ver > ssl->minor_ver ||
- suite_info->max_minor_ver < ssl->minor_ver )
- {
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: version" ) );
- return( 0 );
- }
- #if defined(MBEDTLS_SSL_PROTO_DTLS)
- if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
- ( suite_info->flags & MBEDTLS_CIPHERSUITE_NODTLS ) )
- return( 0 );
- #endif
- #if defined(MBEDTLS_ARC4_C)
- if( ssl->conf->arc4_disabled == MBEDTLS_SSL_ARC4_DISABLED &&
- suite_info->cipher == MBEDTLS_CIPHER_ARC4_128 )
- {
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: rc4" ) );
- return( 0 );
- }
- #endif
- #if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
- if( suite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE &&
- ( ssl->handshake->cli_exts & MBEDTLS_TLS_EXT_ECJPAKE_KKPP_OK ) == 0 )
- {
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: ecjpake "
- "not configured or ext missing" ) );
- return( 0 );
- }
- #endif
- #if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C)
- if( mbedtls_ssl_ciphersuite_uses_ec( suite_info ) &&
- ( ssl->handshake->curves == NULL ||
- ssl->handshake->curves[0] == NULL ) )
- {
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: "
- "no common elliptic curve" ) );
- return( 0 );
- }
- #endif
- #if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED)
- /* If the ciphersuite requires a pre-shared key and we don't
- * have one, skip it now rather than failing later */
- if( mbedtls_ssl_ciphersuite_uses_psk( suite_info ) &&
- ssl->conf->f_psk == NULL &&
- ( ssl->conf->psk == NULL || ssl->conf->psk_identity == NULL ||
- ssl->conf->psk_identity_len == 0 || ssl->conf->psk_len == 0 ) )
- {
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: no pre-shared key" ) );
- return( 0 );
- }
- #endif
- #if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \
- defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
- /* If the ciphersuite requires signing, check whether
- * a suitable hash algorithm is present. */
- if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
- {
- sig_type = mbedtls_ssl_get_ciphersuite_sig_alg( suite_info );
- if( sig_type != MBEDTLS_PK_NONE &&
- mbedtls_ssl_sig_hash_set_find( &ssl->handshake->hash_algs, sig_type ) == MBEDTLS_MD_NONE )
- {
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: no suitable hash algorithm "
- "for signature algorithm %d", sig_type ) );
- return( 0 );
- }
- }
- #endif /* MBEDTLS_SSL_PROTO_TLS1_2 &&
- MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */
- #if defined(MBEDTLS_X509_CRT_PARSE_C)
- /*
- * Final check: if ciphersuite requires us to have a
- * certificate/key of a particular type:
- * - select the appropriate certificate if we have one, or
- * - try the next ciphersuite if we don't
- * This must be done last since we modify the key_cert list.
- */
- if( ssl_pick_cert( ssl, suite_info ) != 0 )
- {
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: "
- "no suitable certificate" ) );
- return( 0 );
- }
- #endif
- *ciphersuite_info = suite_info;
- return( 0 );
- }
- #if defined(MBEDTLS_SSL_SRV_SUPPORT_SSLV2_CLIENT_HELLO)
- static int ssl_parse_client_hello_v2( mbedtls_ssl_context *ssl )
- {
- int ret, got_common_suite;
- unsigned int i, j;
- size_t n;
- unsigned int ciph_len, sess_len, chal_len;
- unsigned char *buf, *p;
- const int *ciphersuites;
- const mbedtls_ssl_ciphersuite_t *ciphersuite_info;
- MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse client hello v2" ) );
- #if defined(MBEDTLS_SSL_RENEGOTIATION)
- if( ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "client hello v2 illegal for renegotiation" ) );
- mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
- MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
- }
- #endif /* MBEDTLS_SSL_RENEGOTIATION */
- buf = ssl->in_hdr;
- MBEDTLS_SSL_DEBUG_BUF( 4, "record header", buf, 5 );
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v2, message type: %d",
- buf[2] ) );
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v2, message len.: %d",
- ( ( buf[0] & 0x7F ) << 8 ) | buf[1] ) );
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v2, max. version: [%d:%d]",
- buf[3], buf[4] ) );
- /*
- * SSLv2 Client Hello
- *
- * Record layer:
- * 0 . 1 message length
- *
- * SSL layer:
- * 2 . 2 message type
- * 3 . 4 protocol version
- */
- if( buf[2] != MBEDTLS_SSL_HS_CLIENT_HELLO ||
- buf[3] != MBEDTLS_SSL_MAJOR_VERSION_3 )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
- }
- n = ( ( buf[0] << 8 ) | buf[1] ) & 0x7FFF;
- if( n < 17 || n > 512 )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
- }
- ssl->major_ver = MBEDTLS_SSL_MAJOR_VERSION_3;
- ssl->minor_ver = ( buf[4] <= ssl->conf->max_minor_ver )
- ? buf[4] : ssl->conf->max_minor_ver;
- if( ssl->minor_ver < ssl->conf->min_minor_ver )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "client only supports ssl smaller than minimum"
- " [%d:%d] < [%d:%d]",
- ssl->major_ver, ssl->minor_ver,
- ssl->conf->min_major_ver, ssl->conf->min_minor_ver ) );
- mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
- MBEDTLS_SSL_ALERT_MSG_PROTOCOL_VERSION );
- return( MBEDTLS_ERR_SSL_BAD_HS_PROTOCOL_VERSION );
- }
- ssl->handshake->max_major_ver = buf[3];
- ssl->handshake->max_minor_ver = buf[4];
- if( ( ret = mbedtls_ssl_fetch_input( ssl, 2 + n ) ) != 0 )
- {
- MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_fetch_input", ret );
- return( ret );
- }
- ssl->handshake->update_checksum( ssl, buf + 2, n );
- buf = ssl->in_msg;
- n = ssl->in_left - 5;
- /*
- * 0 . 1 ciphersuitelist length
- * 2 . 3 session id length
- * 4 . 5 challenge length
- * 6 . .. ciphersuitelist
- * .. . .. session id
- * .. . .. challenge
- */
- MBEDTLS_SSL_DEBUG_BUF( 4, "record contents", buf, n );
- ciph_len = ( buf[0] << 8 ) | buf[1];
- sess_len = ( buf[2] << 8 ) | buf[3];
- chal_len = ( buf[4] << 8 ) | buf[5];
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciph_len: %d, sess_len: %d, chal_len: %d",
- ciph_len, sess_len, chal_len ) );
- /*
- * Make sure each parameter length is valid
- */
- if( ciph_len < 3 || ( ciph_len % 3 ) != 0 )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
- }
- if( sess_len > 32 )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
- }
- if( chal_len < 8 || chal_len > 32 )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
- }
- if( n != 6 + ciph_len + sess_len + chal_len )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
- }
- MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, ciphersuitelist",
- buf + 6, ciph_len );
- MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, session id",
- buf + 6 + ciph_len, sess_len );
- MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, challenge",
- buf + 6 + ciph_len + sess_len, chal_len );
- p = buf + 6 + ciph_len;
- ssl->session_negotiate->id_len = sess_len;
- memset( ssl->session_negotiate->id, 0,
- sizeof( ssl->session_negotiate->id ) );
- memcpy( ssl->session_negotiate->id, p, ssl->session_negotiate->id_len );
- p += sess_len;
- memset( ssl->handshake->randbytes, 0, 64 );
- memcpy( ssl->handshake->randbytes + 32 - chal_len, p, chal_len );
- /*
- * Check for TLS_EMPTY_RENEGOTIATION_INFO_SCSV
- */
- for( i = 0, p = buf + 6; i < ciph_len; i += 3, p += 3 )
- {
- if( p[0] == 0 && p[1] == 0 && p[2] == MBEDTLS_SSL_EMPTY_RENEGOTIATION_INFO )
- {
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "received TLS_EMPTY_RENEGOTIATION_INFO " ) );
- #if defined(MBEDTLS_SSL_RENEGOTIATION)
- if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "received RENEGOTIATION SCSV "
- "during renegotiation" ) );
- mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
- MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
- }
- #endif /* MBEDTLS_SSL_RENEGOTIATION */
- ssl->secure_renegotiation = MBEDTLS_SSL_SECURE_RENEGOTIATION;
- break;
- }
- }
- #if defined(MBEDTLS_SSL_FALLBACK_SCSV)
- for( i = 0, p = buf + 6; i < ciph_len; i += 3, p += 3 )
- {
- if( p[0] == 0 &&
- p[1] == (unsigned char)( ( MBEDTLS_SSL_FALLBACK_SCSV_VALUE >> 8 ) & 0xff ) &&
- p[2] == (unsigned char)( ( MBEDTLS_SSL_FALLBACK_SCSV_VALUE ) & 0xff ) )
- {
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "received FALLBACK_SCSV" ) );
- if( ssl->minor_ver < ssl->conf->max_minor_ver )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "inapropriate fallback" ) );
- mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
- MBEDTLS_SSL_ALERT_MSG_INAPROPRIATE_FALLBACK );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
- }
- break;
- }
- }
- #endif /* MBEDTLS_SSL_FALLBACK_SCSV */
- got_common_suite = 0;
- ciphersuites = ssl->conf->ciphersuite_list[ssl->minor_ver];
- ciphersuite_info = NULL;
- #if defined(MBEDTLS_SSL_SRV_RESPECT_CLIENT_PREFERENCE)
- for( j = 0, p = buf + 6; j < ciph_len; j += 3, p += 3 )
- for( i = 0; ciphersuites[i] != 0; i++ )
- #else
- for( i = 0; ciphersuites[i] != 0; i++ )
- for( j = 0, p = buf + 6; j < ciph_len; j += 3, p += 3 )
- #endif
- {
- if( p[0] != 0 ||
- p[1] != ( ( ciphersuites[i] >> 8 ) & 0xFF ) ||
- p[2] != ( ( ciphersuites[i] ) & 0xFF ) )
- continue;
- got_common_suite = 1;
- if( ( ret = ssl_ciphersuite_match( ssl, ciphersuites[i],
- &ciphersuite_info ) ) != 0 )
- return( ret );
- if( ciphersuite_info != NULL )
- goto have_ciphersuite_v2;
- }
- if( got_common_suite )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "got ciphersuites in common, "
- "but none of them usable" ) );
- return( MBEDTLS_ERR_SSL_NO_USABLE_CIPHERSUITE );
- }
- else
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no ciphersuites in common" ) );
- return( MBEDTLS_ERR_SSL_NO_CIPHER_CHOSEN );
- }
- have_ciphersuite_v2:
- MBEDTLS_SSL_DEBUG_MSG( 2, ( "selected ciphersuite: %s", ciphersuite_info->name ) );
- ssl->session_negotiate->ciphersuite = ciphersuites[i];
- ssl->transform_negotiate->ciphersuite_info = ciphersuite_info;
- /*
- * SSLv2 Client Hello relevant renegotiation security checks
- */
- if( ssl->secure_renegotiation == MBEDTLS_SSL_LEGACY_RENEGOTIATION &&
- ssl->conf->allow_legacy_renegotiation == MBEDTLS_SSL_LEGACY_BREAK_HANDSHAKE )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "legacy renegotiation, breaking off handshake" ) );
- mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
- MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
- }
- ssl->in_left = 0;
- ssl->state++;
- MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse client hello v2" ) );
- return( 0 );
- }
- #endif /* MBEDTLS_SSL_SRV_SUPPORT_SSLV2_CLIENT_HELLO */
- /* This function doesn't alert on errors that happen early during
- ClientHello parsing because they might indicate that the client is
- not talking SSL/TLS at all and would not understand our alert. */
- static int ssl_parse_client_hello( mbedtls_ssl_context *ssl )
- {
- int ret, got_common_suite;
- size_t i, j;
- size_t ciph_offset, comp_offset, ext_offset;
- size_t msg_len, ciph_len, sess_len, comp_len, ext_len;
- #if defined(MBEDTLS_SSL_PROTO_DTLS)
- size_t cookie_offset, cookie_len;
- #endif
- unsigned char *buf, *p, *ext;
- #if defined(MBEDTLS_SSL_RENEGOTIATION)
- int renegotiation_info_seen = 0;
- #endif
- int handshake_failure = 0;
- const int *ciphersuites;
- const mbedtls_ssl_ciphersuite_t *ciphersuite_info;
- int major, minor;
- /* If there is no signature-algorithm extension present,
- * we need to fall back to the default values for allowed
- * signature-hash pairs. */
- #if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \
- defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
- int sig_hash_alg_ext_present = 0;
- #endif /* MBEDTLS_SSL_PROTO_TLS1_2 &&
- MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */
- MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse client hello" ) );
- #if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
- read_record_header:
- #endif
- /*
- * If renegotiating, then the input was read with mbedtls_ssl_read_record(),
- * otherwise read it ourselves manually in order to support SSLv2
- * ClientHello, which doesn't use the same record layer format.
- */
- #if defined(MBEDTLS_SSL_RENEGOTIATION)
- if( ssl->renego_status == MBEDTLS_SSL_INITIAL_HANDSHAKE )
- #endif
- {
- if( ( ret = mbedtls_ssl_fetch_input( ssl, 5 ) ) != 0 )
- {
- /* No alert on a read error. */
- MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_fetch_input", ret );
- return( ret );
- }
- }
- buf = ssl->in_hdr;
- #if defined(MBEDTLS_SSL_SRV_SUPPORT_SSLV2_CLIENT_HELLO)
- #if defined(MBEDTLS_SSL_PROTO_DTLS)
- if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_STREAM )
- #endif
- if( ( buf[0] & 0x80 ) != 0 )
- return( ssl_parse_client_hello_v2( ssl ) );
- #endif
- MBEDTLS_SSL_DEBUG_BUF( 4, "record header", buf, mbedtls_ssl_hdr_len( ssl ) );
- /*
- * SSLv3/TLS Client Hello
- *
- * Record layer:
- * 0 . 0 message type
- * 1 . 2 protocol version
- * 3 . 11 DTLS: epoch + record sequence number
- * 3 . 4 message length
- */
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, message type: %d",
- buf[0] ) );
- if( buf[0] != MBEDTLS_SSL_MSG_HANDSHAKE )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
- }
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, message len.: %d",
- ( ssl->in_len[0] << 8 ) | ssl->in_len[1] ) );
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, protocol version: [%d:%d]",
- buf[1], buf[2] ) );
- mbedtls_ssl_read_version( &major, &minor, ssl->conf->transport, buf + 1 );
- /* According to RFC 5246 Appendix E.1, the version here is typically
- * "{03,00}, the lowest version number supported by the client, [or] the
- * value of ClientHello.client_version", so the only meaningful check here
- * is the major version shouldn't be less than 3 */
- if( major < MBEDTLS_SSL_MAJOR_VERSION_3 )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
- }
- /* For DTLS if this is the initial handshake, remember the client sequence
- * number to use it in our next message (RFC 6347 4.2.1) */
- #if defined(MBEDTLS_SSL_PROTO_DTLS)
- if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM
- #if defined(MBEDTLS_SSL_RENEGOTIATION)
- && ssl->renego_status == MBEDTLS_SSL_INITIAL_HANDSHAKE
- #endif
- )
- {
- /* Epoch should be 0 for initial handshakes */
- if( ssl->in_ctr[0] != 0 || ssl->in_ctr[1] != 0 )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
- }
- memcpy( ssl->out_ctr + 2, ssl->in_ctr + 2, 6 );
- #if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
- if( mbedtls_ssl_dtls_replay_check( ssl ) != 0 )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "replayed record, discarding" ) );
- ssl->next_record_offset = 0;
- ssl->in_left = 0;
- goto read_record_header;
- }
- /* No MAC to check yet, so we can update right now */
- mbedtls_ssl_dtls_replay_update( ssl );
- #endif
- }
- #endif /* MBEDTLS_SSL_PROTO_DTLS */
- msg_len = ( ssl->in_len[0] << 8 ) | ssl->in_len[1];
- #if defined(MBEDTLS_SSL_RENEGOTIATION)
- if( ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE )
- {
- /* Set by mbedtls_ssl_read_record() */
- msg_len = ssl->in_hslen;
- }
- else
- #endif
- {
- if( msg_len > MBEDTLS_SSL_MAX_CONTENT_LEN )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
- }
- if( ( ret = mbedtls_ssl_fetch_input( ssl,
- mbedtls_ssl_hdr_len( ssl ) + msg_len ) ) != 0 )
- {
- MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_fetch_input", ret );
- return( ret );
- }
- /* Done reading this record, get ready for the next one */
- #if defined(MBEDTLS_SSL_PROTO_DTLS)
- if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
- ssl->next_record_offset = msg_len + mbedtls_ssl_hdr_len( ssl );
- else
- #endif
- ssl->in_left = 0;
- }
- buf = ssl->in_msg;
- MBEDTLS_SSL_DEBUG_BUF( 4, "record contents", buf, msg_len );
- ssl->handshake->update_checksum( ssl, buf, msg_len );
- /*
- * Handshake layer:
- * 0 . 0 handshake type
- * 1 . 3 handshake length
- * 4 . 5 DTLS only: message seqence number
- * 6 . 8 DTLS only: fragment offset
- * 9 . 11 DTLS only: fragment length
- */
- if( msg_len < mbedtls_ssl_hs_hdr_len( ssl ) )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
- }
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, handshake type: %d", buf[0] ) );
- if( buf[0] != MBEDTLS_SSL_HS_CLIENT_HELLO )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
- }
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, handshake len.: %d",
- ( buf[1] << 16 ) | ( buf[2] << 8 ) | buf[3] ) );
- /* We don't support fragmentation of ClientHello (yet?) */
- if( buf[1] != 0 ||
- msg_len != mbedtls_ssl_hs_hdr_len( ssl ) + ( ( buf[2] << 8 ) | buf[3] ) )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
- }
- #if defined(MBEDTLS_SSL_PROTO_DTLS)
- if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
- {
- /*
- * Copy the client's handshake message_seq on initial handshakes,
- * check sequence number on renego.
- */
- #if defined(MBEDTLS_SSL_RENEGOTIATION)
- if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS )
- {
- /* This couldn't be done in ssl_prepare_handshake_record() */
- unsigned int cli_msg_seq = ( ssl->in_msg[4] << 8 ) |
- ssl->in_msg[5];
- if( cli_msg_seq != ssl->handshake->in_msg_seq )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message_seq: "
- "%d (expected %d)", cli_msg_seq,
- ssl->handshake->in_msg_seq ) );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
- }
- ssl->handshake->in_msg_seq++;
- }
- else
- #endif
- {
- unsigned int cli_msg_seq = ( ssl->in_msg[4] << 8 ) |
- ssl->in_msg[5];
- ssl->handshake->out_msg_seq = cli_msg_seq;
- ssl->handshake->in_msg_seq = cli_msg_seq + 1;
- }
- /*
- * For now we don't support fragmentation, so make sure
- * fragment_offset == 0 and fragment_length == length
- */
- if( ssl->in_msg[6] != 0 || ssl->in_msg[7] != 0 || ssl->in_msg[8] != 0 ||
- memcmp( ssl->in_msg + 1, ssl->in_msg + 9, 3 ) != 0 )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "ClientHello fragmentation not supported" ) );
- return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
- }
- }
- #endif /* MBEDTLS_SSL_PROTO_DTLS */
- buf += mbedtls_ssl_hs_hdr_len( ssl );
- msg_len -= mbedtls_ssl_hs_hdr_len( ssl );
- /*
- * ClientHello layer:
- * 0 . 1 protocol version
- * 2 . 33 random bytes (starting with 4 bytes of Unix time)
- * 34 . 35 session id length (1 byte)
- * 35 . 34+x session id
- * 35+x . 35+x DTLS only: cookie length (1 byte)
- * 36+x . .. DTLS only: cookie
- * .. . .. ciphersuite list length (2 bytes)
- * .. . .. ciphersuite list
- * .. . .. compression alg. list length (1 byte)
- * .. . .. compression alg. list
- * .. . .. extensions length (2 bytes, optional)
- * .. . .. extensions (optional)
- */
- /*
- * Minimal length (with everything empty and extensions ommitted) is
- * 2 + 32 + 1 + 2 + 1 = 38 bytes. Check that first, so that we can
- * read at least up to session id length without worrying.
- */
- if( msg_len < 38 )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
- }
- /*
- * Check and save the protocol version
- */
- MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, version", buf, 2 );
- mbedtls_ssl_read_version( &ssl->major_ver, &ssl->minor_ver,
- ssl->conf->transport, buf );
- ssl->handshake->max_major_ver = ssl->major_ver;
- ssl->handshake->max_minor_ver = ssl->minor_ver;
- if( ssl->major_ver < ssl->conf->min_major_ver ||
- ssl->minor_ver < ssl->conf->min_minor_ver )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "client only supports ssl smaller than minimum"
- " [%d:%d] < [%d:%d]",
- ssl->major_ver, ssl->minor_ver,
- ssl->conf->min_major_ver, ssl->conf->min_minor_ver ) );
- mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
- MBEDTLS_SSL_ALERT_MSG_PROTOCOL_VERSION );
- return( MBEDTLS_ERR_SSL_BAD_HS_PROTOCOL_VERSION );
- }
- if( ssl->major_ver > ssl->conf->max_major_ver )
- {
- ssl->major_ver = ssl->conf->max_major_ver;
- ssl->minor_ver = ssl->conf->max_minor_ver;
- }
- else if( ssl->minor_ver > ssl->conf->max_minor_ver )
- ssl->minor_ver = ssl->conf->max_minor_ver;
- /*
- * Save client random (inc. Unix time)
- */
- MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, random bytes", buf + 2, 32 );
- memcpy( ssl->handshake->randbytes, buf + 2, 32 );
- /*
- * Check the session ID length and save session ID
- */
- sess_len = buf[34];
- if( sess_len > sizeof( ssl->session_negotiate->id ) ||
- sess_len + 34 + 2 > msg_len ) /* 2 for cipherlist length field */
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
- mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
- MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
- }
- MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, session id", buf + 35, sess_len );
- ssl->session_negotiate->id_len = sess_len;
- memset( ssl->session_negotiate->id, 0,
- sizeof( ssl->session_negotiate->id ) );
- memcpy( ssl->session_negotiate->id, buf + 35,
- ssl->session_negotiate->id_len );
- /*
- * Check the cookie length and content
- */
- #if defined(MBEDTLS_SSL_PROTO_DTLS)
- if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
- {
- cookie_offset = 35 + sess_len;
- cookie_len = buf[cookie_offset];
- if( cookie_offset + 1 + cookie_len + 2 > msg_len )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
- mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
- MBEDTLS_SSL_ALERT_MSG_PROTOCOL_VERSION );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
- }
- MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, cookie",
- buf + cookie_offset + 1, cookie_len );
- #if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY)
- if( ssl->conf->f_cookie_check != NULL
- #if defined(MBEDTLS_SSL_RENEGOTIATION)
- && ssl->renego_status == MBEDTLS_SSL_INITIAL_HANDSHAKE
- #endif
- )
- {
- if( ssl->conf->f_cookie_check( ssl->conf->p_cookie,
- buf + cookie_offset + 1, cookie_len,
- ssl->cli_id, ssl->cli_id_len ) != 0 )
- {
- MBEDTLS_SSL_DEBUG_MSG( 2, ( "cookie verification failed" ) );
- ssl->handshake->verify_cookie_len = 1;
- }
- else
- {
- MBEDTLS_SSL_DEBUG_MSG( 2, ( "cookie verification passed" ) );
- ssl->handshake->verify_cookie_len = 0;
- }
- }
- else
- #endif /* MBEDTLS_SSL_DTLS_HELLO_VERIFY */
- {
- /* We know we didn't send a cookie, so it should be empty */
- if( cookie_len != 0 )
- {
- /* This may be an attacker's probe, so don't send an alert */
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
- }
- MBEDTLS_SSL_DEBUG_MSG( 2, ( "cookie verification skipped" ) );
- }
- /*
- * Check the ciphersuitelist length (will be parsed later)
- */
- ciph_offset = cookie_offset + 1 + cookie_len;
- }
- else
- #endif /* MBEDTLS_SSL_PROTO_DTLS */
- ciph_offset = 35 + sess_len;
- ciph_len = ( buf[ciph_offset + 0] << 8 )
- | ( buf[ciph_offset + 1] );
- if( ciph_len < 2 ||
- ciph_len + 2 + ciph_offset + 1 > msg_len || /* 1 for comp. alg. len */
- ( ciph_len % 2 ) != 0 )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
- mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
- MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
- }
- MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, ciphersuitelist",
- buf + ciph_offset + 2, ciph_len );
- /*
- * Check the compression algorithms length and pick one
- */
- comp_offset = ciph_offset + 2 + ciph_len;
- comp_len = buf[comp_offset];
- if( comp_len < 1 ||
- comp_len > 16 ||
- comp_len + comp_offset + 1 > msg_len )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
- mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
- MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
- }
- MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, compression",
- buf + comp_offset + 1, comp_len );
- ssl->session_negotiate->compression = MBEDTLS_SSL_COMPRESS_NULL;
- #if defined(MBEDTLS_ZLIB_SUPPORT)
- for( i = 0; i < comp_len; ++i )
- {
- if( buf[comp_offset + 1 + i] == MBEDTLS_SSL_COMPRESS_DEFLATE )
- {
- ssl->session_negotiate->compression = MBEDTLS_SSL_COMPRESS_DEFLATE;
- break;
- }
- }
- #endif
- /* See comments in ssl_write_client_hello() */
- #if defined(MBEDTLS_SSL_PROTO_DTLS)
- if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
- ssl->session_negotiate->compression = MBEDTLS_SSL_COMPRESS_NULL;
- #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
- */
- ext_offset = comp_offset + 1 + comp_len;
- if( msg_len > ext_offset )
- {
- if( msg_len < ext_offset + 2 )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
- mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
- MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
- }
- ext_len = ( buf[ext_offset + 0] << 8 )
- | ( buf[ext_offset + 1] );
- if( ( ext_len > 0 && ext_len < 4 ) ||
- msg_len != ext_offset + 2 + ext_len )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
- mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
- MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
- }
- }
- else
- ext_len = 0;
- ext = buf + ext_offset + 2;
- MBEDTLS_SSL_DEBUG_BUF( 3, "client hello extensions", ext, ext_len );
- while( ext_len != 0 )
- {
- unsigned int ext_id;
- unsigned int ext_size;
- if ( ext_len < 4 ) {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
- mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
- MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
- }
- ext_id = ( ( ext[0] << 8 ) | ( ext[1] ) );
- ext_size = ( ( ext[2] << 8 ) | ( ext[3] ) );
- if( ext_size + 4 > ext_len )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
- mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
- MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
- }
- switch( ext_id )
- {
- #if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
- case MBEDTLS_TLS_EXT_SERVERNAME:
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "found ServerName extension" ) );
- if( ssl->conf->f_sni == NULL )
- break;
- ret = ssl_parse_servername_ext( ssl, ext + 4, ext_size );
- if( ret != 0 )
- return( ret );
- break;
- #endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */
- case MBEDTLS_TLS_EXT_RENEGOTIATION_INFO:
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "found renegotiation extension" ) );
- #if defined(MBEDTLS_SSL_RENEGOTIATION)
- renegotiation_info_seen = 1;
- #endif
- ret = ssl_parse_renegotiation_info( ssl, ext + 4, ext_size );
- if( ret != 0 )
- return( ret );
- break;
- #if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \
- defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
- case MBEDTLS_TLS_EXT_SIG_ALG:
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "found signature_algorithms extension" ) );
- ret = ssl_parse_signature_algorithms_ext( ssl, ext + 4, ext_size );
- if( ret != 0 )
- return( ret );
- sig_hash_alg_ext_present = 1;
- break;
- #endif /* MBEDTLS_SSL_PROTO_TLS1_2 &&
- MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */
- #if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \
- defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
- case MBEDTLS_TLS_EXT_SUPPORTED_ELLIPTIC_CURVES:
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "found supported elliptic curves extension" ) );
- ret = ssl_parse_supported_elliptic_curves( ssl, ext + 4, ext_size );
- if( ret != 0 )
- return( ret );
- break;
- case MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS:
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "found supported point formats extension" ) );
- ssl->handshake->cli_exts |= MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS_PRESENT;
- ret = ssl_parse_supported_point_formats( ssl, ext + 4, ext_size );
- if( ret != 0 )
- return( ret );
- break;
- #endif /* MBEDTLS_ECDH_C || MBEDTLS_ECDSA_C ||
- MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
- #if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
- case MBEDTLS_TLS_EXT_ECJPAKE_KKPP:
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "found ecjpake kkpp extension" ) );
- ret = ssl_parse_ecjpake_kkpp( ssl, ext + 4, ext_size );
- if( ret != 0 )
- return( ret );
- break;
- #endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
- #if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
- case MBEDTLS_TLS_EXT_MAX_FRAGMENT_LENGTH:
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "found max fragment length extension" ) );
- ret = ssl_parse_max_fragment_length_ext( ssl, ext + 4, ext_size );
- if( ret != 0 )
- return( ret );
- break;
- #endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
- #if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
- case MBEDTLS_TLS_EXT_TRUNCATED_HMAC:
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "found truncated hmac extension" ) );
- ret = ssl_parse_truncated_hmac_ext( ssl, ext + 4, ext_size );
- if( ret != 0 )
- return( ret );
- break;
- #endif /* MBEDTLS_SSL_TRUNCATED_HMAC */
- #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
- case MBEDTLS_TLS_EXT_ENCRYPT_THEN_MAC:
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "found encrypt then mac extension" ) );
- ret = ssl_parse_encrypt_then_mac_ext( ssl, ext + 4, ext_size );
- if( ret != 0 )
- return( ret );
- break;
- #endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */
- #if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
- case MBEDTLS_TLS_EXT_EXTENDED_MASTER_SECRET:
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "found extended master secret extension" ) );
- ret = ssl_parse_extended_ms_ext( ssl, ext + 4, ext_size );
- if( ret != 0 )
- return( ret );
- break;
- #endif /* MBEDTLS_SSL_EXTENDED_MASTER_SECRET */
- #if defined(MBEDTLS_SSL_SESSION_TICKETS)
- case MBEDTLS_TLS_EXT_SESSION_TICKET:
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "found session ticket extension" ) );
- ret = ssl_parse_session_ticket_ext( ssl, ext + 4, ext_size );
- if( ret != 0 )
- return( ret );
- break;
- #endif /* MBEDTLS_SSL_SESSION_TICKETS */
- #if defined(MBEDTLS_SSL_ALPN)
- case MBEDTLS_TLS_EXT_ALPN:
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "found alpn extension" ) );
- ret = ssl_parse_alpn_ext( ssl, ext + 4, ext_size );
- if( ret != 0 )
- return( ret );
- break;
- #endif /* MBEDTLS_SSL_SESSION_TICKETS */
- default:
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "unknown extension found: %d (ignoring)",
- ext_id ) );
- }
- ext_len -= 4 + ext_size;
- ext += 4 + ext_size;
- if( ext_len > 0 && ext_len < 4 )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
- mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
- MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
- }
- }
- #if defined(MBEDTLS_SSL_PROTO_SSL3)
- }
- #endif
- #if defined(MBEDTLS_SSL_FALLBACK_SCSV)
- for( i = 0, p = buf + ciph_offset + 2; i < ciph_len; i += 2, p += 2 )
- {
- if( p[0] == (unsigned char)( ( MBEDTLS_SSL_FALLBACK_SCSV_VALUE >> 8 ) & 0xff ) &&
- p[1] == (unsigned char)( ( MBEDTLS_SSL_FALLBACK_SCSV_VALUE ) & 0xff ) )
- {
- MBEDTLS_SSL_DEBUG_MSG( 2, ( "received FALLBACK_SCSV" ) );
- if( ssl->minor_ver < ssl->conf->max_minor_ver )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "inapropriate fallback" ) );
- mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
- MBEDTLS_SSL_ALERT_MSG_INAPROPRIATE_FALLBACK );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
- }
- break;
- }
- }
- #endif /* MBEDTLS_SSL_FALLBACK_SCSV */
- #if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \
- defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
- /*
- * Try to fall back to default hash SHA1 if the client
- * hasn't provided any preferred signature-hash combinations.
- */
- if( sig_hash_alg_ext_present == 0 )
- {
- mbedtls_md_type_t md_default = MBEDTLS_MD_SHA1;
- if( mbedtls_ssl_check_sig_hash( ssl, md_default ) != 0 )
- md_default = MBEDTLS_MD_NONE;
- mbedtls_ssl_sig_hash_set_const_hash( &ssl->handshake->hash_algs, md_default );
- }
- #endif /* MBEDTLS_SSL_PROTO_TLS1_2 &&
- MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */
- /*
- * Check for TLS_EMPTY_RENEGOTIATION_INFO_SCSV
- */
- for( i = 0, p = buf + ciph_offset + 2; i < ciph_len; i += 2, p += 2 )
- {
- if( p[0] == 0 && p[1] == MBEDTLS_SSL_EMPTY_RENEGOTIATION_INFO )
- {
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "received TLS_EMPTY_RENEGOTIATION_INFO " ) );
- #if defined(MBEDTLS_SSL_RENEGOTIATION)
- if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "received RENEGOTIATION SCSV "
- "during renegotiation" ) );
- mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
- MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
- }
- #endif
- ssl->secure_renegotiation = MBEDTLS_SSL_SECURE_RENEGOTIATION;
- break;
- }
- }
- /*
- * Renegotiation security checks
- */
- if( ssl->secure_renegotiation != MBEDTLS_SSL_SECURE_RENEGOTIATION &&
- ssl->conf->allow_legacy_renegotiation == MBEDTLS_SSL_LEGACY_BREAK_HANDSHAKE )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "legacy renegotiation, breaking off handshake" ) );
- handshake_failure = 1;
- }
- #if defined(MBEDTLS_SSL_RENEGOTIATION)
- else if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS &&
- ssl->secure_renegotiation == MBEDTLS_SSL_SECURE_RENEGOTIATION &&
- renegotiation_info_seen == 0 )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "renegotiation_info extension missing (secure)" ) );
- handshake_failure = 1;
- }
- else if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS &&
- ssl->secure_renegotiation == MBEDTLS_SSL_LEGACY_RENEGOTIATION &&
- ssl->conf->allow_legacy_renegotiation == MBEDTLS_SSL_LEGACY_NO_RENEGOTIATION )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "legacy renegotiation not allowed" ) );
- handshake_failure = 1;
- }
- else if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS &&
- ssl->secure_renegotiation == MBEDTLS_SSL_LEGACY_RENEGOTIATION &&
- renegotiation_info_seen == 1 )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "renegotiation_info extension present (legacy)" ) );
- handshake_failure = 1;
- }
- #endif /* MBEDTLS_SSL_RENEGOTIATION */
- if( handshake_failure == 1 )
- {
- mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
- MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
- }
- /*
- * Search for a matching ciphersuite
- * (At the end because we need information from the EC-based extensions
- * and certificate from the SNI callback triggered by the SNI extension.)
- */
- got_common_suite = 0;
- ciphersuites = ssl->conf->ciphersuite_list[ssl->minor_ver];
- ciphersuite_info = NULL;
- #if defined(MBEDTLS_SSL_SRV_RESPECT_CLIENT_PREFERENCE)
- for( j = 0, p = buf + ciph_offset + 2; j < ciph_len; j += 2, p += 2 )
- for( i = 0; ciphersuites[i] != 0; i++ )
- #else
- for( i = 0; ciphersuites[i] != 0; i++ )
- for( j = 0, p = buf + ciph_offset + 2; j < ciph_len; j += 2, p += 2 )
- #endif
- {
- if( p[0] != ( ( ciphersuites[i] >> 8 ) & 0xFF ) ||
- p[1] != ( ( ciphersuites[i] ) & 0xFF ) )
- continue;
- got_common_suite = 1;
- if( ( ret = ssl_ciphersuite_match( ssl, ciphersuites[i],
- &ciphersuite_info ) ) != 0 )
- return( ret );
- if( ciphersuite_info != NULL )
- goto have_ciphersuite;
- }
- if( got_common_suite )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "got ciphersuites in common, "
- "but none of them usable" ) );
- mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
- MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
- return( MBEDTLS_ERR_SSL_NO_USABLE_CIPHERSUITE );
- }
- else
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no ciphersuites in common" ) );
- mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
- MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
- return( MBEDTLS_ERR_SSL_NO_CIPHER_CHOSEN );
- }
- have_ciphersuite:
- MBEDTLS_SSL_DEBUG_MSG( 2, ( "selected ciphersuite: %s", ciphersuite_info->name ) );
- ssl->session_negotiate->ciphersuite = ciphersuites[i];
- ssl->transform_negotiate->ciphersuite_info = ciphersuite_info;
- ssl->state++;
- #if defined(MBEDTLS_SSL_PROTO_DTLS)
- if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
- mbedtls_ssl_recv_flight_completed( ssl );
- #endif
- /* Debugging-only output for testsuite */
- #if defined(MBEDTLS_DEBUG_C) && \
- defined(MBEDTLS_SSL_PROTO_TLS1_2) && \
- defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
- if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
- {
- mbedtls_pk_type_t sig_alg = mbedtls_ssl_get_ciphersuite_sig_alg( ciphersuite_info );
- if( sig_alg != MBEDTLS_PK_NONE )
- {
- mbedtls_md_type_t md_alg = mbedtls_ssl_sig_hash_set_find( &ssl->handshake->hash_algs,
- sig_alg );
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, signature_algorithm ext: %d",
- mbedtls_ssl_hash_from_md_alg( md_alg ) ) );
- }
- else
- {
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "no hash algorithm for signature algorithm "
- "%d - should not happen", sig_alg ) );
- }
- }
- #endif
- MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse client hello" ) );
- return( 0 );
- }
- #if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
- static void ssl_write_truncated_hmac_ext( mbedtls_ssl_context *ssl,
- unsigned char *buf,
- size_t *olen )
- {
- unsigned char *p = buf;
- if( ssl->session_negotiate->trunc_hmac == MBEDTLS_SSL_TRUNC_HMAC_DISABLED )
- {
- *olen = 0;
- return;
- }
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, adding truncated hmac extension" ) );
- *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_TRUNCATED_HMAC >> 8 ) & 0xFF );
- *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_TRUNCATED_HMAC ) & 0xFF );
- *p++ = 0x00;
- *p++ = 0x00;
- *olen = 4;
- }
- #endif /* MBEDTLS_SSL_TRUNCATED_HMAC */
- #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
- static void ssl_write_encrypt_then_mac_ext( mbedtls_ssl_context *ssl,
- unsigned char *buf,
- size_t *olen )
- {
- unsigned char *p = buf;
- const mbedtls_ssl_ciphersuite_t *suite = NULL;
- const mbedtls_cipher_info_t *cipher = NULL;
- if( ssl->session_negotiate->encrypt_then_mac == MBEDTLS_SSL_ETM_DISABLED ||
- ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
- {
- *olen = 0;
- return;
- }
- /*
- * RFC 7366: "If a server receives an encrypt-then-MAC request extension
- * from a client and then selects a stream or Authenticated Encryption
- * with Associated Data (AEAD) ciphersuite, it MUST NOT send an
- * encrypt-then-MAC response extension back to the client."
- */
- if( ( suite = mbedtls_ssl_ciphersuite_from_id(
- ssl->session_negotiate->ciphersuite ) ) == NULL ||
- ( cipher = mbedtls_cipher_info_from_type( suite->cipher ) ) == NULL ||
- cipher->mode != MBEDTLS_MODE_CBC )
- {
- *olen = 0;
- return;
- }
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, adding encrypt then mac extension" ) );
- *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ENCRYPT_THEN_MAC >> 8 ) & 0xFF );
- *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ENCRYPT_THEN_MAC ) & 0xFF );
- *p++ = 0x00;
- *p++ = 0x00;
- *olen = 4;
- }
- #endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */
- #if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
- static void ssl_write_extended_ms_ext( mbedtls_ssl_context *ssl,
- unsigned char *buf,
- size_t *olen )
- {
- unsigned char *p = buf;
- if( ssl->handshake->extended_ms == MBEDTLS_SSL_EXTENDED_MS_DISABLED ||
- ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
- {
- *olen = 0;
- return;
- }
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, adding extended master secret "
- "extension" ) );
- *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_EXTENDED_MASTER_SECRET >> 8 ) & 0xFF );
- *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_EXTENDED_MASTER_SECRET ) & 0xFF );
- *p++ = 0x00;
- *p++ = 0x00;
- *olen = 4;
- }
- #endif /* MBEDTLS_SSL_EXTENDED_MASTER_SECRET */
- #if defined(MBEDTLS_SSL_SESSION_TICKETS)
- static void ssl_write_session_ticket_ext( mbedtls_ssl_context *ssl,
- unsigned char *buf,
- size_t *olen )
- {
- unsigned char *p = buf;
- if( ssl->handshake->new_session_ticket == 0 )
- {
- *olen = 0;
- return;
- }
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, adding session ticket extension" ) );
- *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SESSION_TICKET >> 8 ) & 0xFF );
- *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SESSION_TICKET ) & 0xFF );
- *p++ = 0x00;
- *p++ = 0x00;
- *olen = 4;
- }
- #endif /* MBEDTLS_SSL_SESSION_TICKETS */
- static void ssl_write_renegotiation_ext( mbedtls_ssl_context *ssl,
- unsigned char *buf,
- size_t *olen )
- {
- unsigned char *p = buf;
- if( ssl->secure_renegotiation != MBEDTLS_SSL_SECURE_RENEGOTIATION )
- {
- *olen = 0;
- return;
- }
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, secure renegotiation extension" ) );
- *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_RENEGOTIATION_INFO >> 8 ) & 0xFF );
- *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_RENEGOTIATION_INFO ) & 0xFF );
- #if defined(MBEDTLS_SSL_RENEGOTIATION)
- if( ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE )
- {
- *p++ = 0x00;
- *p++ = ( ssl->verify_data_len * 2 + 1 ) & 0xFF;
- *p++ = ssl->verify_data_len * 2 & 0xFF;
- memcpy( p, ssl->peer_verify_data, ssl->verify_data_len );
- p += ssl->verify_data_len;
- memcpy( p, ssl->own_verify_data, ssl->verify_data_len );
- p += ssl->verify_data_len;
- }
- else
- #endif /* MBEDTLS_SSL_RENEGOTIATION */
- {
- *p++ = 0x00;
- *p++ = 0x01;
- *p++ = 0x00;
- }
- *olen = p - buf;
- }
- #if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
- static void ssl_write_max_fragment_length_ext( mbedtls_ssl_context *ssl,
- unsigned char *buf,
- size_t *olen )
- {
- unsigned char *p = buf;
- if( ssl->session_negotiate->mfl_code == MBEDTLS_SSL_MAX_FRAG_LEN_NONE )
- {
- *olen = 0;
- return;
- }
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, max_fragment_length extension" ) );
- *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_MAX_FRAGMENT_LENGTH >> 8 ) & 0xFF );
- *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_MAX_FRAGMENT_LENGTH ) & 0xFF );
- *p++ = 0x00;
- *p++ = 1;
- *p++ = ssl->session_negotiate->mfl_code;
- *olen = 5;
- }
- #endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
- #if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \
- defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
- static void ssl_write_supported_point_formats_ext( mbedtls_ssl_context *ssl,
- unsigned char *buf,
- size_t *olen )
- {
- unsigned char *p = buf;
- ((void) ssl);
- if( ( ssl->handshake->cli_exts &
- MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS_PRESENT ) == 0 )
- {
- *olen = 0;
- return;
- }
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, supported_point_formats extension" ) );
- *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS >> 8 ) & 0xFF );
- *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS ) & 0xFF );
- *p++ = 0x00;
- *p++ = 2;
- *p++ = 1;
- *p++ = MBEDTLS_ECP_PF_UNCOMPRESSED;
- *olen = 6;
- }
- #endif /* MBEDTLS_ECDH_C || MBEDTLS_ECDSA_C || MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
- #if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
- static void ssl_write_ecjpake_kkpp_ext( mbedtls_ssl_context *ssl,
- unsigned char *buf,
- size_t *olen )
- {
- int ret;
- unsigned char *p = buf;
- const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
- size_t kkpp_len;
- *olen = 0;
- /* Skip costly computation if not needed */
- if( ssl->transform_negotiate->ciphersuite_info->key_exchange !=
- MBEDTLS_KEY_EXCHANGE_ECJPAKE )
- return;
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, ecjpake kkpp extension" ) );
- if( end - p < 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 ) & 0xFF );
- ret = mbedtls_ecjpake_write_round_one( &ssl->handshake->ecjpake_ctx,
- p + 2, end - p - 2, &kkpp_len,
- ssl->conf->f_rng, ssl->conf->p_rng );
- if( ret != 0 )
- {
- MBEDTLS_SSL_DEBUG_RET( 1 , "mbedtls_ecjpake_write_round_one", ret );
- return;
- }
- *p++ = (unsigned char)( ( kkpp_len >> 8 ) & 0xFF );
- *p++ = (unsigned char)( ( kkpp_len ) & 0xFF );
- *olen = kkpp_len + 4;
- }
- #endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
- #if defined(MBEDTLS_SSL_ALPN )
- static void ssl_write_alpn_ext( mbedtls_ssl_context *ssl,
- unsigned char *buf, size_t *olen )
- {
- if( ssl->alpn_chosen == NULL )
- {
- *olen = 0;
- return;
- }
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, adding alpn extension" ) );
- /*
- * 0 . 1 ext identifier
- * 2 . 3 ext length
- * 4 . 5 protocol list length
- * 6 . 6 protocol name length
- * 7 . 7+n protocol name
- */
- buf[0] = (unsigned char)( ( MBEDTLS_TLS_EXT_ALPN >> 8 ) & 0xFF );
- buf[1] = (unsigned char)( ( MBEDTLS_TLS_EXT_ALPN ) & 0xFF );
- *olen = 7 + strlen( ssl->alpn_chosen );
- buf[2] = (unsigned char)( ( ( *olen - 4 ) >> 8 ) & 0xFF );
- buf[3] = (unsigned char)( ( ( *olen - 4 ) ) & 0xFF );
- buf[4] = (unsigned char)( ( ( *olen - 6 ) >> 8 ) & 0xFF );
- buf[5] = (unsigned char)( ( ( *olen - 6 ) ) & 0xFF );
- buf[6] = (unsigned char)( ( ( *olen - 7 ) ) & 0xFF );
- memcpy( buf + 7, ssl->alpn_chosen, *olen - 7 );
- }
- #endif /* MBEDTLS_ECDH_C || MBEDTLS_ECDSA_C */
- #if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY)
- static int ssl_write_hello_verify_request( mbedtls_ssl_context *ssl )
- {
- int ret;
- unsigned char *p = ssl->out_msg + 4;
- unsigned char *cookie_len_byte;
- MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write hello verify request" ) );
- /*
- * struct {
- * ProtocolVersion server_version;
- * opaque cookie<0..2^8-1>;
- * } HelloVerifyRequest;
- */
- /* The RFC is not clear on this point, but sending the actual negotiated
- * version looks like the most interoperable thing to do. */
- mbedtls_ssl_write_version( ssl->major_ver, ssl->minor_ver,
- ssl->conf->transport, p );
- MBEDTLS_SSL_DEBUG_BUF( 3, "server version", p, 2 );
- p += 2;
- /* If we get here, f_cookie_check is not null */
- if( ssl->conf->f_cookie_write == NULL )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "inconsistent cookie callbacks" ) );
- return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
- }
- /* Skip length byte until we know the length */
- cookie_len_byte = p++;
- if( ( ret = ssl->conf->f_cookie_write( ssl->conf->p_cookie,
- &p, ssl->out_buf + MBEDTLS_SSL_BUFFER_LEN,
- ssl->cli_id, ssl->cli_id_len ) ) != 0 )
- {
- MBEDTLS_SSL_DEBUG_RET( 1, "f_cookie_write", ret );
- return( ret );
- }
- *cookie_len_byte = (unsigned char)( p - ( cookie_len_byte + 1 ) );
- MBEDTLS_SSL_DEBUG_BUF( 3, "cookie sent", cookie_len_byte + 1, *cookie_len_byte );
- ssl->out_msglen = p - ssl->out_msg;
- ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
- ssl->out_msg[0] = MBEDTLS_SSL_HS_HELLO_VERIFY_REQUEST;
- ssl->state = MBEDTLS_SSL_SERVER_HELLO_VERIFY_REQUEST_SENT;
- if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 )
- {
- MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret );
- return( ret );
- }
- MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write hello verify request" ) );
- return( 0 );
- }
- #endif /* MBEDTLS_SSL_DTLS_HELLO_VERIFY */
- static int ssl_write_server_hello( mbedtls_ssl_context *ssl )
- {
- #if defined(MBEDTLS_HAVE_TIME)
- mbedtls_time_t t;
- #endif
- int ret;
- size_t olen, ext_len = 0, n;
- unsigned char *buf, *p;
- MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write server hello" ) );
- #if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY)
- if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
- ssl->handshake->verify_cookie_len != 0 )
- {
- MBEDTLS_SSL_DEBUG_MSG( 2, ( "client hello was not authenticated" ) );
- MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write server hello" ) );
- return( ssl_write_hello_verify_request( ssl ) );
- }
- #endif /* MBEDTLS_SSL_DTLS_HELLO_VERIFY */
- if( ssl->conf->f_rng == NULL )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "no RNG provided") );
- return( MBEDTLS_ERR_SSL_NO_RNG );
- }
- /*
- * 0 . 0 handshake type
- * 1 . 3 handshake length
- * 4 . 5 protocol version
- * 6 . 9 UNIX time()
- * 10 . 37 random bytes
- */
- buf = ssl->out_msg;
- p = buf + 4;
- mbedtls_ssl_write_version( ssl->major_ver, ssl->minor_ver,
- ssl->conf->transport, p );
- p += 2;
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, chosen version: [%d:%d]",
- buf[4], buf[5] ) );
- #if defined(MBEDTLS_HAVE_TIME)
- t = mbedtls_time( NULL );
- *p++ = (unsigned char)( t >> 24 );
- *p++ = (unsigned char)( t >> 16 );
- *p++ = (unsigned char)( t >> 8 );
- *p++ = (unsigned char)( t );
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, current time: %lu", t ) );
- #else
- if( ( ret = ssl->conf->f_rng( ssl->conf->p_rng, p, 4 ) ) != 0 )
- return( ret );
- p += 4;
- #endif /* MBEDTLS_HAVE_TIME */
- if( ( ret = ssl->conf->f_rng( ssl->conf->p_rng, p, 28 ) ) != 0 )
- return( ret );
- p += 28;
- memcpy( ssl->handshake->randbytes + 32, buf + 6, 32 );
- MBEDTLS_SSL_DEBUG_BUF( 3, "server hello, random bytes", buf + 6, 32 );
- /*
- * Resume is 0 by default, see ssl_handshake_init().
- * It may be already set to 1 by ssl_parse_session_ticket_ext().
- * If not, try looking up session ID in our cache.
- */
- if( ssl->handshake->resume == 0 &&
- #if defined(MBEDTLS_SSL_RENEGOTIATION)
- ssl->renego_status == MBEDTLS_SSL_INITIAL_HANDSHAKE &&
- #endif
- ssl->session_negotiate->id_len != 0 &&
- ssl->conf->f_get_cache != NULL &&
- ssl->conf->f_get_cache( ssl->conf->p_cache, ssl->session_negotiate ) == 0 )
- {
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "session successfully restored from cache" ) );
- ssl->handshake->resume = 1;
- }
- if( ssl->handshake->resume == 0 )
- {
- /*
- * New session, create a new session id,
- * unless we're about to issue a session ticket
- */
- ssl->state++;
- #if defined(MBEDTLS_HAVE_TIME)
- ssl->session_negotiate->start = mbedtls_time( NULL );
- #endif
- #if defined(MBEDTLS_SSL_SESSION_TICKETS)
- if( ssl->handshake->new_session_ticket != 0 )
- {
- ssl->session_negotiate->id_len = n = 0;
- memset( ssl->session_negotiate->id, 0, 32 );
- }
- else
- #endif /* MBEDTLS_SSL_SESSION_TICKETS */
- {
- ssl->session_negotiate->id_len = n = 32;
- if( ( ret = ssl->conf->f_rng( ssl->conf->p_rng, ssl->session_negotiate->id,
- n ) ) != 0 )
- return( ret );
- }
- }
- else
- {
- /*
- * Resuming a session
- */
- n = ssl->session_negotiate->id_len;
- ssl->state = MBEDTLS_SSL_SERVER_CHANGE_CIPHER_SPEC;
- if( ( ret = mbedtls_ssl_derive_keys( ssl ) ) != 0 )
- {
- MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_derive_keys", ret );
- return( ret );
- }
- }
- /*
- * 38 . 38 session id length
- * 39 . 38+n session id
- * 39+n . 40+n chosen ciphersuite
- * 41+n . 41+n chosen compression alg.
- * 42+n . 43+n extensions length
- * 44+n . 43+n+m extensions
- */
- *p++ = (unsigned char) ssl->session_negotiate->id_len;
- memcpy( p, ssl->session_negotiate->id, ssl->session_negotiate->id_len );
- p += ssl->session_negotiate->id_len;
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, session id len.: %d", n ) );
- MBEDTLS_SSL_DEBUG_BUF( 3, "server hello, session id", buf + 39, n );
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "%s session has been resumed",
- ssl->handshake->resume ? "a" : "no" ) );
- *p++ = (unsigned char)( ssl->session_negotiate->ciphersuite >> 8 );
- *p++ = (unsigned char)( ssl->session_negotiate->ciphersuite );
- *p++ = (unsigned char)( ssl->session_negotiate->compression );
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, chosen ciphersuite: %s",
- mbedtls_ssl_get_ciphersuite_name( ssl->session_negotiate->ciphersuite ) ) );
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, compress alg.: 0x%02X",
- 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
- */
- ssl_write_renegotiation_ext( ssl, p + 2 + ext_len, &olen );
- ext_len += olen;
- #if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
- ssl_write_max_fragment_length_ext( ssl, p + 2 + ext_len, &olen );
- ext_len += olen;
- #endif
- #if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
- ssl_write_truncated_hmac_ext( ssl, p + 2 + ext_len, &olen );
- ext_len += olen;
- #endif
- #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
- ssl_write_encrypt_then_mac_ext( ssl, p + 2 + ext_len, &olen );
- ext_len += olen;
- #endif
- #if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
- ssl_write_extended_ms_ext( ssl, p + 2 + ext_len, &olen );
- ext_len += olen;
- #endif
- #if defined(MBEDTLS_SSL_SESSION_TICKETS)
- ssl_write_session_ticket_ext( ssl, p + 2 + ext_len, &olen );
- ext_len += olen;
- #endif
- #if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \
- defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
- if ( mbedtls_ssl_ciphersuite_uses_ec(
- mbedtls_ssl_ciphersuite_from_id( ssl->session_negotiate->ciphersuite ) ) )
- {
- ssl_write_supported_point_formats_ext( ssl, p + 2 + ext_len, &olen );
- ext_len += olen;
- }
- #endif
- #if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
- ssl_write_ecjpake_kkpp_ext( ssl, p + 2 + ext_len, &olen );
- ext_len += olen;
- #endif
- #if defined(MBEDTLS_SSL_ALPN)
- ssl_write_alpn_ext( ssl, p + 2 + ext_len, &olen );
- ext_len += olen;
- #endif
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, total extension length: %d", ext_len ) );
- if( ext_len > 0 )
- {
- *p++ = (unsigned char)( ( ext_len >> 8 ) & 0xFF );
- *p++ = (unsigned char)( ( ext_len ) & 0xFF );
- p += ext_len;
- }
- #if defined(MBEDTLS_SSL_PROTO_SSL3)
- }
- #endif
- ssl->out_msglen = p - buf;
- ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
- ssl->out_msg[0] = MBEDTLS_SSL_HS_SERVER_HELLO;
- ret = mbedtls_ssl_write_record( ssl );
- MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write server hello" ) );
- return( ret );
- }
- #if !defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED) && \
- !defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED) && \
- !defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) && \
- !defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) && \
- !defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED)&& \
- !defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED)
- static int ssl_write_certificate_request( mbedtls_ssl_context *ssl )
- {
- const mbedtls_ssl_ciphersuite_t *ciphersuite_info =
- ssl->transform_negotiate->ciphersuite_info;
- MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write certificate request" ) );
- if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK ||
- ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK ||
- ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK ||
- ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK ||
- ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE )
- {
- MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate request" ) );
- ssl->state++;
- return( 0 );
- }
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
- return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
- }
- #else
- static int ssl_write_certificate_request( mbedtls_ssl_context *ssl )
- {
- int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
- const mbedtls_ssl_ciphersuite_t *ciphersuite_info =
- ssl->transform_negotiate->ciphersuite_info;
- size_t dn_size, total_dn_size; /* excluding length bytes */
- size_t ct_len, sa_len; /* including length bytes */
- unsigned char *buf, *p;
- const unsigned char * const end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
- const mbedtls_x509_crt *crt;
- int authmode;
- MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write certificate request" ) );
- ssl->state++;
- #if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
- if( ssl->handshake->sni_authmode != MBEDTLS_SSL_VERIFY_UNSET )
- authmode = ssl->handshake->sni_authmode;
- else
- #endif
- authmode = ssl->conf->authmode;
- if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK ||
- ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK ||
- ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK ||
- ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK ||
- ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE ||
- authmode == MBEDTLS_SSL_VERIFY_NONE )
- {
- MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate request" ) );
- return( 0 );
- }
- /*
- * 0 . 0 handshake type
- * 1 . 3 handshake length
- * 4 . 4 cert type count
- * 5 .. m-1 cert types
- * m .. m+1 sig alg length (TLS 1.2 only)
- * m+1 .. n-1 SignatureAndHashAlgorithms (TLS 1.2 only)
- * n .. n+1 length of all DNs
- * n+2 .. n+3 length of DN 1
- * n+4 .. ... Distinguished Name #1
- * ... .. ... length of DN 2, etc.
- */
- buf = ssl->out_msg;
- p = buf + 4;
- /*
- * Supported certificate types
- *
- * ClientCertificateType certificate_types<1..2^8-1>;
- * enum { (255) } ClientCertificateType;
- */
- ct_len = 0;
- #if defined(MBEDTLS_RSA_C)
- p[1 + ct_len++] = MBEDTLS_SSL_CERT_TYPE_RSA_SIGN;
- #endif
- #if defined(MBEDTLS_ECDSA_C)
- p[1 + ct_len++] = MBEDTLS_SSL_CERT_TYPE_ECDSA_SIGN;
- #endif
- p[0] = (unsigned char) ct_len++;
- p += ct_len;
- sa_len = 0;
- #if defined(MBEDTLS_SSL_PROTO_TLS1_2)
- /*
- * Add signature_algorithms for verify (TLS 1.2)
- *
- * SignatureAndHashAlgorithm supported_signature_algorithms<2..2^16-2>;
- *
- * struct {
- * HashAlgorithm hash;
- * SignatureAlgorithm signature;
- * } SignatureAndHashAlgorithm;
- *
- * enum { (255) } HashAlgorithm;
- * enum { (255) } SignatureAlgorithm;
- */
- if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
- {
- const int *cur;
- /*
- * Supported signature algorithms
- */
- for( cur = ssl->conf->sig_hashes; *cur != MBEDTLS_MD_NONE; cur++ )
- {
- unsigned char hash = mbedtls_ssl_hash_from_md_alg( *cur );
- if( MBEDTLS_SSL_HASH_NONE == hash || mbedtls_ssl_set_calc_verify_md( ssl, hash ) )
- continue;
- #if defined(MBEDTLS_RSA_C)
- p[2 + sa_len++] = hash;
- p[2 + sa_len++] = MBEDTLS_SSL_SIG_RSA;
- #endif
- #if defined(MBEDTLS_ECDSA_C)
- p[2 + sa_len++] = hash;
- p[2 + sa_len++] = MBEDTLS_SSL_SIG_ECDSA;
- #endif
- }
- p[0] = (unsigned char)( sa_len >> 8 );
- p[1] = (unsigned char)( sa_len );
- sa_len += 2;
- p += sa_len;
- }
- #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
- /*
- * DistinguishedName certificate_authorities<0..2^16-1>;
- * opaque DistinguishedName<1..2^16-1>;
- */
- p += 2;
- total_dn_size = 0;
- if( ssl->conf->cert_req_ca_list == MBEDTLS_SSL_CERT_REQ_CA_LIST_ENABLED )
- {
- #if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
- if( ssl->handshake->sni_ca_chain != NULL )
- crt = ssl->handshake->sni_ca_chain;
- else
- #endif
- crt = ssl->conf->ca_chain;
- while( crt != NULL && crt->version != 0 )
- {
- dn_size = crt->subject_raw.len;
- if( end < p ||
- (size_t)( end - p ) < dn_size ||
- (size_t)( end - p ) < 2 + dn_size )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "skipping CAs: buffer too short" ) );
- break;
- }
- *p++ = (unsigned char)( dn_size >> 8 );
- *p++ = (unsigned char)( dn_size );
- memcpy( p, crt->subject_raw.p, dn_size );
- p += dn_size;
- MBEDTLS_SSL_DEBUG_BUF( 3, "requested DN", p - dn_size, dn_size );
- total_dn_size += 2 + dn_size;
- crt = crt->next;
- }
- }
- ssl->out_msglen = p - buf;
- ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
- ssl->out_msg[0] = MBEDTLS_SSL_HS_CERTIFICATE_REQUEST;
- ssl->out_msg[4 + ct_len + sa_len] = (unsigned char)( total_dn_size >> 8 );
- ssl->out_msg[5 + ct_len + sa_len] = (unsigned char)( total_dn_size );
- ret = mbedtls_ssl_write_record( ssl );
- MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write certificate request" ) );
- return( ret );
- }
- #endif /* !MBEDTLS_KEY_EXCHANGE_RSA_ENABLED &&
- !MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED &&
- !MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED &&
- !MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED &&
- !MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED &&
- !MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED */
- #if defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) || \
- defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED)
- static int ssl_get_ecdh_params_from_cert( mbedtls_ssl_context *ssl )
- {
- int ret;
- if( ! mbedtls_pk_can_do( mbedtls_ssl_own_key( ssl ), MBEDTLS_PK_ECKEY ) )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "server key not ECDH capable" ) );
- return( MBEDTLS_ERR_SSL_PK_TYPE_MISMATCH );
- }
- if( ( ret = mbedtls_ecdh_get_params( &ssl->handshake->ecdh_ctx,
- mbedtls_pk_ec( *mbedtls_ssl_own_key( ssl ) ),
- MBEDTLS_ECDH_OURS ) ) != 0 )
- {
- MBEDTLS_SSL_DEBUG_RET( 1, ( "mbedtls_ecdh_get_params" ), ret );
- return( ret );
- }
- return( 0 );
- }
- #endif /* MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) ||
- MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED */
- static int ssl_write_server_key_exchange( mbedtls_ssl_context *ssl )
- {
- int ret;
- size_t n = 0;
- const mbedtls_ssl_ciphersuite_t *ciphersuite_info =
- ssl->transform_negotiate->ciphersuite_info;
- #if defined(MBEDTLS_KEY_EXCHANGE__SOME_PFS__ENABLED)
- unsigned char *p = ssl->out_msg + 4;
- size_t len = 0;
- #if defined(MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED)
- unsigned char *dig_signed = p;
- size_t dig_signed_len = 0;
- #endif /* MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED */
- #endif /* MBEDTLS_KEY_EXCHANGE__SOME_PFS__ENABLED */
- MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write server key exchange" ) );
- /*
- *
- * Part 1: Extract static ECDH parameters and abort
- * if ServerKeyExchange not needed.
- *
- */
- /* For suites involving ECDH, extract DH parameters
- * from certificate at this point. */
- #if defined(MBEDTLS_KEY_EXCHANGE__SOME__ECDH_ENABLED)
- if( mbedtls_ssl_ciphersuite_uses_ecdh( ciphersuite_info ) )
- {
- ssl_get_ecdh_params_from_cert( ssl );
- }
- #endif /* MBEDTLS_KEY_EXCHANGE__SOME__ECDH_ENABLED */
- /* Key exchanges not involving ephemeral keys don't use
- * ServerKeyExchange, so end here. */
- #if defined(MBEDTLS_KEY_EXCHANGE__SOME_NON_PFS__ENABLED)
- if( mbedtls_ssl_ciphersuite_no_pfs( ciphersuite_info ) )
- {
- MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write server key exchange" ) );
- ssl->state++;
- return( 0 );
- }
- #endif /* MBEDTLS_KEY_EXCHANGE__NON_PFS__ENABLED */
- /*
- *
- * Part 2: Provide key exchange parameters for chosen ciphersuite.
- *
- */
- /*
- * - ECJPAKE key exchanges
- */
- #if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
- if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE )
- {
- const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
- ret = mbedtls_ecjpake_write_round_two( &ssl->handshake->ecjpake_ctx,
- p, end - p, &len, ssl->conf->f_rng, ssl->conf->p_rng );
- if( ret != 0 )
- {
- MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecjpake_write_round_two", ret );
- return( ret );
- }
- p += len;
- n += len;
- }
- #endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
- /*
- * For (EC)DHE key exchanges with PSK, parameters are prefixed by support
- * identity hint (RFC 4279, Sec. 3). Until someone needs this feature,
- * we use empty support identity hints here.
- **/
- #if defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED) || \
- defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED)
- if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK ||
- ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK )
- {
- *(p++) = 0x00;
- *(p++) = 0x00;
- n += 2;
- }
- #endif /* MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED ||
- MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED */
- /*
- * - DHE key exchanges
- */
- #if defined(MBEDTLS_KEY_EXCHANGE__SOME__DHE_ENABLED)
- if( mbedtls_ssl_ciphersuite_uses_dhe( ciphersuite_info ) )
- {
- if( ssl->conf->dhm_P.p == NULL || ssl->conf->dhm_G.p == NULL )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "no DH parameters set" ) );
- return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
- }
- /*
- * Ephemeral DH parameters:
- *
- * struct {
- * opaque dh_p<1..2^16-1>;
- * opaque dh_g<1..2^16-1>;
- * opaque dh_Ys<1..2^16-1>;
- * } ServerDHParams;
- */
- if( ( ret = mbedtls_dhm_set_group( &ssl->handshake->dhm_ctx,
- &ssl->conf->dhm_P,
- &ssl->conf->dhm_G ) ) != 0 )
- {
- MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_dhm_set_group", ret );
- return( ret );
- }
- if( ( ret = mbedtls_dhm_make_params( &ssl->handshake->dhm_ctx,
- (int) mbedtls_mpi_size( &ssl->handshake->dhm_ctx.P ),
- p, &len, ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 )
- {
- MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_dhm_make_params", ret );
- return( ret );
- }
- #if defined(MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED)
- dig_signed = p;
- dig_signed_len = len;
- #endif
- p += len;
- n += len;
- MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: X ", &ssl->handshake->dhm_ctx.X );
- MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: P ", &ssl->handshake->dhm_ctx.P );
- MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: G ", &ssl->handshake->dhm_ctx.G );
- MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: GX", &ssl->handshake->dhm_ctx.GX );
- }
- #endif /* MBEDTLS_KEY_EXCHANGE__SOME__DHE_ENABLED */
- /*
- * - ECDHE key exchanges
- */
- #if defined(MBEDTLS_KEY_EXCHANGE__SOME__ECDHE_ENABLED)
- if( mbedtls_ssl_ciphersuite_uses_ecdhe( ciphersuite_info ) )
- {
- /*
- * Ephemeral ECDH parameters:
- *
- * struct {
- * ECParameters curve_params;
- * ECPoint public;
- * } ServerECDHParams;
- */
- const mbedtls_ecp_curve_info **curve = NULL;
- const mbedtls_ecp_group_id *gid;
- /* Match our preference list against the offered curves */
- for( gid = ssl->conf->curve_list; *gid != MBEDTLS_ECP_DP_NONE; gid++ )
- for( curve = ssl->handshake->curves; *curve != NULL; curve++ )
- if( (*curve)->grp_id == *gid )
- goto curve_matching_done;
- curve_matching_done:
- if( curve == NULL || *curve == NULL )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "no matching curve for ECDHE" ) );
- return( MBEDTLS_ERR_SSL_NO_CIPHER_CHOSEN );
- }
- MBEDTLS_SSL_DEBUG_MSG( 2, ( "ECDHE curve: %s", (*curve)->name ) );
- if( ( ret = mbedtls_ecp_group_load( &ssl->handshake->ecdh_ctx.grp,
- (*curve)->grp_id ) ) != 0 )
- {
- MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecp_group_load", ret );
- return( ret );
- }
- if( ( ret = mbedtls_ecdh_make_params( &ssl->handshake->ecdh_ctx, &len,
- p, MBEDTLS_SSL_MAX_CONTENT_LEN - n,
- ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 )
- {
- MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_make_params", ret );
- return( ret );
- }
- #if defined(MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED)
- dig_signed = p;
- dig_signed_len = len;
- #endif
- p += len;
- n += len;
- MBEDTLS_SSL_DEBUG_ECP( 3, "ECDH: Q ", &ssl->handshake->ecdh_ctx.Q );
- }
- #endif /* MBEDTLS_KEY_EXCHANGE__SOME__ECDHE_ENABLED */
- /*
- *
- * Part 3: For key exchanges involving the server signing the
- * exchange parameters, compute and add the signature here.
- *
- */
- #if defined(MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED)
- if( mbedtls_ssl_ciphersuite_uses_server_signature( ciphersuite_info ) )
- {
- size_t signature_len = 0;
- unsigned int hashlen = 0;
- unsigned char hash[64];
- /*
- * 3.1: Choose hash algorithm:
- * A: For TLS 1.2, obey signature-hash-algorithm extension
- * to choose appropriate hash.
- * B: For SSL3, TLS1.0, TLS1.1 and ECDHE_ECDSA, use SHA1
- * (RFC 4492, Sec. 5.4)
- * C: Otherwise, use MD5 + SHA1 (RFC 4346, Sec. 7.4.3)
- */
- mbedtls_md_type_t md_alg;
- #if defined(MBEDTLS_SSL_PROTO_TLS1_2)
- mbedtls_pk_type_t sig_alg =
- mbedtls_ssl_get_ciphersuite_sig_pk_alg( ciphersuite_info );
- if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
- {
- /* A: For TLS 1.2, obey signature-hash-algorithm extension
- * (RFC 5246, Sec. 7.4.1.4.1). */
- if( sig_alg == MBEDTLS_PK_NONE ||
- ( md_alg = mbedtls_ssl_sig_hash_set_find( &ssl->handshake->hash_algs,
- sig_alg ) ) == MBEDTLS_MD_NONE )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
- /* (... because we choose a cipher suite
- * only if there is a matching hash.) */
- return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
- }
- }
- else
- #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
- #if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
- defined(MBEDTLS_SSL_PROTO_TLS1_1)
- if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA )
- {
- /* B: Default hash SHA1 */
- md_alg = MBEDTLS_MD_SHA1;
- }
- else
- #endif /* MBEDTLS_SSL_PROTO_SSL3 || MBEDTLS_SSL_PROTO_TLS1 || \
- MBEDTLS_SSL_PROTO_TLS1_1 */
- {
- /* C: MD5 + SHA1 */
- md_alg = MBEDTLS_MD_NONE;
- }
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "pick hash algorithm %d for signing", md_alg ) );
- /*
- * 3.2: Compute the hash to be signed
- */
- #if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
- defined(MBEDTLS_SSL_PROTO_TLS1_1)
- if( md_alg == MBEDTLS_MD_NONE )
- {
- hashlen = 36;
- ret = mbedtls_ssl_get_key_exchange_md_ssl_tls( ssl, hash,
- dig_signed,
- dig_signed_len );
- if( ret != 0 )
- return( ret );
- }
- else
- #endif /* MBEDTLS_SSL_PROTO_SSL3 || MBEDTLS_SSL_PROTO_TLS1 || \
- MBEDTLS_SSL_PROTO_TLS1_1 */
- #if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
- defined(MBEDTLS_SSL_PROTO_TLS1_2)
- if( md_alg != MBEDTLS_MD_NONE )
- {
- /* Info from md_alg will be used instead */
- hashlen = 0;
- ret = mbedtls_ssl_get_key_exchange_md_tls1_2( ssl, hash,
- dig_signed,
- dig_signed_len,
- md_alg );
- if( ret != 0 )
- return( ret );
- }
- else
- #endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 || \
- MBEDTLS_SSL_PROTO_TLS1_2 */
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
- return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
- }
- MBEDTLS_SSL_DEBUG_BUF( 3, "parameters hash", hash, hashlen != 0 ? hashlen :
- (unsigned int) ( mbedtls_md_get_size( mbedtls_md_info_from_type( md_alg ) ) ) );
- /*
- * 3.3: Compute and add the signature
- */
- if( mbedtls_ssl_own_key( ssl ) == NULL )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no private key" ) );
- return( MBEDTLS_ERR_SSL_PRIVATE_KEY_REQUIRED );
- }
- #if defined(MBEDTLS_SSL_PROTO_TLS1_2)
- if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
- {
- /*
- * For TLS 1.2, we need to specify signature and hash algorithm
- * explicitly through a prefix to the signature.
- *
- * struct {
- * HashAlgorithm hash;
- * SignatureAlgorithm signature;
- * } SignatureAndHashAlgorithm;
- *
- * struct {
- * SignatureAndHashAlgorithm algorithm;
- * opaque signature<0..2^16-1>;
- * } DigitallySigned;
- *
- */
- *(p++) = mbedtls_ssl_hash_from_md_alg( md_alg );
- *(p++) = mbedtls_ssl_sig_from_pk_alg( sig_alg );
- n += 2;
- }
- #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
- if( ( ret = mbedtls_pk_sign( mbedtls_ssl_own_key( ssl ), md_alg, hash, hashlen,
- p + 2 , &signature_len, ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 )
- {
- MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_pk_sign", ret );
- return( ret );
- }
- *(p++) = (unsigned char)( signature_len >> 8 );
- *(p++) = (unsigned char)( signature_len );
- n += 2;
- MBEDTLS_SSL_DEBUG_BUF( 3, "my signature", p, signature_len );
- n += signature_len;
- }
- #endif /* MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED */
- /* Done with actual work; add header and send. */
- ssl->out_msglen = 4 + n;
- ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
- ssl->out_msg[0] = MBEDTLS_SSL_HS_SERVER_KEY_EXCHANGE;
- ssl->state++;
- if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 )
- {
- MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret );
- return( ret );
- }
- MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write server key exchange" ) );
- return( 0 );
- }
- static int ssl_write_server_hello_done( mbedtls_ssl_context *ssl )
- {
- int ret;
- MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write server hello done" ) );
- ssl->out_msglen = 4;
- ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
- ssl->out_msg[0] = MBEDTLS_SSL_HS_SERVER_HELLO_DONE;
- ssl->state++;
- #if defined(MBEDTLS_SSL_PROTO_DTLS)
- if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
- mbedtls_ssl_send_flight_completed( ssl );
- #endif
- if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 )
- {
- MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret );
- return( ret );
- }
- MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write server hello done" ) );
- return( 0 );
- }
- #if defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED) || \
- defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED)
- static int ssl_parse_client_dh_public( mbedtls_ssl_context *ssl, unsigned char **p,
- const unsigned char *end )
- {
- int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
- size_t n;
- /*
- * Receive G^Y mod P, premaster = (G^Y)^X mod P
- */
- if( *p + 2 > end )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
- }
- n = ( (*p)[0] << 8 ) | (*p)[1];
- *p += 2;
- if( *p + n > end )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
- }
- if( ( ret = mbedtls_dhm_read_public( &ssl->handshake->dhm_ctx, *p, n ) ) != 0 )
- {
- MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_dhm_read_public", ret );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE_RP );
- }
- *p += n;
- MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: GY", &ssl->handshake->dhm_ctx.GY );
- return( ret );
- }
- #endif /* MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED ||
- MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED */
- #if defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED) || \
- defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED)
- static int ssl_parse_encrypted_pms( mbedtls_ssl_context *ssl,
- const unsigned char *p,
- const unsigned char *end,
- size_t pms_offset )
- {
- int ret;
- size_t len = mbedtls_pk_get_len( mbedtls_ssl_own_key( ssl ) );
- unsigned char *pms = ssl->handshake->premaster + pms_offset;
- unsigned char ver[2];
- unsigned char fake_pms[48], peer_pms[48];
- unsigned char mask;
- size_t i, peer_pmslen;
- unsigned int diff;
- if( ! mbedtls_pk_can_do( mbedtls_ssl_own_key( ssl ), MBEDTLS_PK_RSA ) )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no RSA private key" ) );
- return( MBEDTLS_ERR_SSL_PRIVATE_KEY_REQUIRED );
- }
- /*
- * Decrypt the premaster using own private RSA key
- */
- #if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
- defined(MBEDTLS_SSL_PROTO_TLS1_2)
- if( ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_0 )
- {
- if ( p + 2 > end ) {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
- }
- if( *p++ != ( ( len >> 8 ) & 0xFF ) ||
- *p++ != ( ( len ) & 0xFF ) )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
- }
- }
- #endif
- if( p + len != end )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
- }
- mbedtls_ssl_write_version( ssl->handshake->max_major_ver,
- ssl->handshake->max_minor_ver,
- ssl->conf->transport, ver );
- /*
- * Protection against Bleichenbacher's attack: invalid PKCS#1 v1.5 padding
- * must not cause the connection to end immediately; instead, send a
- * bad_record_mac later in the handshake.
- * Also, avoid data-dependant branches here to protect against
- * timing-based variants.
- */
- ret = ssl->conf->f_rng( ssl->conf->p_rng, fake_pms, sizeof( fake_pms ) );
- if( ret != 0 )
- return( ret );
- ret = mbedtls_pk_decrypt( mbedtls_ssl_own_key( ssl ), p, len,
- peer_pms, &peer_pmslen,
- sizeof( peer_pms ),
- ssl->conf->f_rng, ssl->conf->p_rng );
- diff = (unsigned int) ret;
- diff |= peer_pmslen ^ 48;
- diff |= peer_pms[0] ^ ver[0];
- diff |= peer_pms[1] ^ ver[1];
- #if defined(MBEDTLS_SSL_DEBUG_ALL)
- if( diff != 0 )
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
- #endif
- if( sizeof( ssl->handshake->premaster ) < pms_offset ||
- sizeof( ssl->handshake->premaster ) - pms_offset < 48 )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
- return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
- }
- ssl->handshake->pmslen = 48;
- /* mask = diff ? 0xff : 0x00 using bit operations to avoid branches */
- /* MSVC has a warning about unary minus on unsigned, but this is
- * well-defined and precisely what we want to do here */
- #if defined(_MSC_VER)
- #pragma warning( push )
- #pragma warning( disable : 4146 )
- #endif
- mask = - ( ( diff | - diff ) >> ( sizeof( unsigned int ) * 8 - 1 ) );
- #if defined(_MSC_VER)
- #pragma warning( pop )
- #endif
- for( i = 0; i < ssl->handshake->pmslen; i++ )
- pms[i] = ( mask & fake_pms[i] ) | ( (~mask) & peer_pms[i] );
- return( 0 );
- }
- #endif /* MBEDTLS_KEY_EXCHANGE_RSA_ENABLED ||
- MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED */
- #if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED)
- static int ssl_parse_client_psk_identity( mbedtls_ssl_context *ssl, unsigned char **p,
- const unsigned char *end )
- {
- int ret = 0;
- size_t n;
- if( ssl->conf->f_psk == NULL &&
- ( ssl->conf->psk == NULL || ssl->conf->psk_identity == NULL ||
- ssl->conf->psk_identity_len == 0 || ssl->conf->psk_len == 0 ) )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no pre-shared key" ) );
- return( MBEDTLS_ERR_SSL_PRIVATE_KEY_REQUIRED );
- }
- /*
- * Receive client pre-shared key identity name
- */
- if( end - *p < 2 )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
- }
- n = ( (*p)[0] << 8 ) | (*p)[1];
- *p += 2;
- if( n < 1 || n > 65535 || n > (size_t) ( end - *p ) )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
- }
- if( ssl->conf->f_psk != NULL )
- {
- if( ssl->conf->f_psk( ssl->conf->p_psk, ssl, *p, n ) != 0 )
- ret = MBEDTLS_ERR_SSL_UNKNOWN_IDENTITY;
- }
- else
- {
- /* Identity is not a big secret since clients send it in the clear,
- * but treat it carefully anyway, just in case */
- if( n != ssl->conf->psk_identity_len ||
- mbedtls_ssl_safer_memcmp( ssl->conf->psk_identity, *p, n ) != 0 )
- {
- ret = MBEDTLS_ERR_SSL_UNKNOWN_IDENTITY;
- }
- }
- if( ret == MBEDTLS_ERR_SSL_UNKNOWN_IDENTITY )
- {
- MBEDTLS_SSL_DEBUG_BUF( 3, "Unknown PSK identity", *p, n );
- mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
- MBEDTLS_SSL_ALERT_MSG_UNKNOWN_PSK_IDENTITY );
- return( MBEDTLS_ERR_SSL_UNKNOWN_IDENTITY );
- }
- *p += n;
- return( 0 );
- }
- #endif /* MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED */
- static int ssl_parse_client_key_exchange( mbedtls_ssl_context *ssl )
- {
- int ret;
- const mbedtls_ssl_ciphersuite_t *ciphersuite_info;
- unsigned char *p, *end;
- ciphersuite_info = ssl->transform_negotiate->ciphersuite_info;
- MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse client key exchange" ) );
- if( ( ret = mbedtls_ssl_read_record( ssl ) ) != 0 )
- {
- MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
- return( ret );
- }
- p = ssl->in_msg + mbedtls_ssl_hs_hdr_len( ssl );
- end = ssl->in_msg + ssl->in_hslen;
- if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
- }
- if( ssl->in_msg[0] != MBEDTLS_SSL_HS_CLIENT_KEY_EXCHANGE )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
- }
- #if defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED)
- if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_RSA )
- {
- if( ( ret = ssl_parse_client_dh_public( ssl, &p, end ) ) != 0 )
- {
- MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_client_dh_public" ), ret );
- return( ret );
- }
- if( p != end )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange" ) );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
- }
- if( ( ret = mbedtls_dhm_calc_secret( &ssl->handshake->dhm_ctx,
- ssl->handshake->premaster,
- MBEDTLS_PREMASTER_SIZE,
- &ssl->handshake->pmslen,
- ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 )
- {
- MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_dhm_calc_secret", ret );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE_CS );
- }
- MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: K ", &ssl->handshake->dhm_ctx.K );
- }
- else
- #endif /* MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED */
- #if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) || \
- defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) || \
- defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) || \
- defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED)
- if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_RSA ||
- ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA ||
- ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDH_RSA ||
- ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA )
- {
- if( ( ret = mbedtls_ecdh_read_public( &ssl->handshake->ecdh_ctx,
- p, end - p) ) != 0 )
- {
- MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_read_public", ret );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE_RP );
- }
- MBEDTLS_SSL_DEBUG_ECP( 3, "ECDH: Qp ", &ssl->handshake->ecdh_ctx.Qp );
- if( ( ret = mbedtls_ecdh_calc_secret( &ssl->handshake->ecdh_ctx,
- &ssl->handshake->pmslen,
- ssl->handshake->premaster,
- MBEDTLS_MPI_MAX_SIZE,
- ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 )
- {
- MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_calc_secret", ret );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE_CS );
- }
- MBEDTLS_SSL_DEBUG_MPI( 3, "ECDH: z ", &ssl->handshake->ecdh_ctx.z );
- }
- else
- #endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED ||
- MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED ||
- MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED ||
- MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED */
- #if defined(MBEDTLS_KEY_EXCHANGE_PSK_ENABLED)
- if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK )
- {
- if( ( ret = ssl_parse_client_psk_identity( ssl, &p, end ) ) != 0 )
- {
- MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_client_psk_identity" ), ret );
- return( ret );
- }
- if( p != end )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange" ) );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
- }
- if( ( ret = mbedtls_ssl_psk_derive_premaster( ssl,
- ciphersuite_info->key_exchange ) ) != 0 )
- {
- MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_psk_derive_premaster", ret );
- return( ret );
- }
- }
- else
- #endif /* MBEDTLS_KEY_EXCHANGE_PSK_ENABLED */
- #if defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED)
- if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK )
- {
- if( ( ret = ssl_parse_client_psk_identity( ssl, &p, end ) ) != 0 )
- {
- MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_client_psk_identity" ), ret );
- return( ret );
- }
- if( ( ret = ssl_parse_encrypted_pms( ssl, p, end, 2 ) ) != 0 )
- {
- MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_encrypted_pms" ), ret );
- return( ret );
- }
- if( ( ret = mbedtls_ssl_psk_derive_premaster( ssl,
- ciphersuite_info->key_exchange ) ) != 0 )
- {
- MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_psk_derive_premaster", ret );
- return( ret );
- }
- }
- else
- #endif /* MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED */
- #if defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED)
- if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK )
- {
- if( ( ret = ssl_parse_client_psk_identity( ssl, &p, end ) ) != 0 )
- {
- MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_client_psk_identity" ), ret );
- return( ret );
- }
- if( ( ret = ssl_parse_client_dh_public( ssl, &p, end ) ) != 0 )
- {
- MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_client_dh_public" ), ret );
- return( ret );
- }
- if( p != end )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange" ) );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
- }
- if( ( ret = mbedtls_ssl_psk_derive_premaster( ssl,
- ciphersuite_info->key_exchange ) ) != 0 )
- {
- MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_psk_derive_premaster", ret );
- return( ret );
- }
- }
- else
- #endif /* MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED */
- #if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED)
- if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK )
- {
- if( ( ret = ssl_parse_client_psk_identity( ssl, &p, end ) ) != 0 )
- {
- MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_client_psk_identity" ), ret );
- return( ret );
- }
- if( ( ret = mbedtls_ecdh_read_public( &ssl->handshake->ecdh_ctx,
- p, end - p ) ) != 0 )
- {
- MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_read_public", ret );
- return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE_RP );
- }
- MBEDTLS_SSL_DEBUG_ECP( 3, "ECDH: Qp ", &ssl->handshake->ecdh_ctx.Qp );
- if( ( ret = mbedtls_ssl_psk_derive_premaster( ssl,
- ciphersuite_info->key_exchange ) ) != 0 )
- {
- MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_psk_derive_premaster", ret );
- return( ret );
- }
- }
- else
- #endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED */
- #if defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED)
- if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA )
- {
- if( ( ret = ssl_parse_encrypted_pms( ssl, p, end, 0 ) ) != 0 )
- {
- MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_parse_encrypted_pms_secret" ), ret );
- return( ret );
- }
- }
- else
- #endif /* MBEDTLS_KEY_EXCHANGE_RSA_ENABLED */
- #if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
- if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE )
- {
- ret = mbedtls_ecjpake_read_round_two( &ssl->handshake->ecjpake_ctx,
- p, end - p );
- if( ret != 0 )
- {
- MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecjpake_read_round_two", ret );
- return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
- }
- ret = mbedtls_ecjpake_derive_secret( &ssl->handshake->ecjpake_ctx,
- ssl->handshake->premaster, 32, &ssl->handshake->pmslen,
- ssl->conf->f_rng, ssl->conf->p_rng );
- if( ret != 0 )
- {
- MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecjpake_derive_secret", ret );
- return( ret );
- }
- }
- else
- #endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
- return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
- }
- if( ( ret = mbedtls_ssl_derive_keys( ssl ) ) != 0 )
- {
- MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_derive_keys", ret );
- return( ret );
- }
- ssl->state++;
- MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse client key exchange" ) );
- return( 0 );
- }
- #if !defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED) && \
- !defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED) && \
- !defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) && \
- !defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) && \
- !defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED)&& \
- !defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED)
- static int ssl_parse_certificate_verify( mbedtls_ssl_context *ssl )
- {
- const mbedtls_ssl_ciphersuite_t *ciphersuite_info =
- ssl->transform_negotiate->ciphersuite_info;
- MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse certificate verify" ) );
- if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK ||
- ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK ||
- ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK ||
- ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK ||
- ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE )
- {
- MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate verify" ) );
- ssl->state++;
- return( 0 );
- }
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
- return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
- }
- #else
- static int ssl_parse_certificate_verify( mbedtls_ssl_context *ssl )
- {
- int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
- size_t i, sig_len;
- unsigned char hash[48];
- unsigned char *hash_start = hash;
- size_t hashlen;
- #if defined(MBEDTLS_SSL_PROTO_TLS1_2)
- mbedtls_pk_type_t pk_alg;
- #endif
- mbedtls_md_type_t md_alg;
- const mbedtls_ssl_ciphersuite_t *ciphersuite_info =
- ssl->transform_negotiate->ciphersuite_info;
- MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse certificate verify" ) );
- if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK ||
- ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK ||
- ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK ||
- ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK ||
- ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE ||
- ssl->session_negotiate->peer_cert == NULL )
- {
- MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate verify" ) );
- ssl->state++;
- return( 0 );
- }
- /* Read the message without adding it to the checksum */
- do {
- if( ( ret = mbedtls_ssl_read_record_layer( ssl ) ) != 0 )
- {
- MBEDTLS_SSL_DEBUG_RET( 1, ( "mbedtls_ssl_read_record_layer" ), ret );
- return( ret );
- }
- ret = mbedtls_ssl_handle_message_type( ssl );
- } while( MBEDTLS_ERR_SSL_NON_FATAL == ret );
- if( 0 != ret )
- {
- MBEDTLS_SSL_DEBUG_RET( 1, ( "mbedtls_ssl_handle_message_type" ), ret );
- return( ret );
- }
- ssl->state++;
- /* Process the message contents */
- if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE ||
- ssl->in_msg[0] != MBEDTLS_SSL_HS_CERTIFICATE_VERIFY )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate verify message" ) );
- return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY );
- }
- i = mbedtls_ssl_hs_hdr_len( ssl );
- /*
- * struct {
- * SignatureAndHashAlgorithm algorithm; -- TLS 1.2 only
- * opaque signature<0..2^16-1>;
- * } DigitallySigned;
- */
- #if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
- defined(MBEDTLS_SSL_PROTO_TLS1_1)
- if( ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_3 )
- {
- md_alg = MBEDTLS_MD_NONE;
- hashlen = 36;
- /* For ECDSA, use SHA-1, not MD-5 + SHA-1 */
- if( mbedtls_pk_can_do( &ssl->session_negotiate->peer_cert->pk,
- MBEDTLS_PK_ECDSA ) )
- {
- hash_start += 16;
- hashlen -= 16;
- md_alg = MBEDTLS_MD_SHA1;
- }
- }
- else
- #endif /* MBEDTLS_SSL_PROTO_SSL3 || MBEDTLS_SSL_PROTO_TLS1 ||
- MBEDTLS_SSL_PROTO_TLS1_1 */
- #if defined(MBEDTLS_SSL_PROTO_TLS1_2)
- if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
- {
- if( i + 2 > ssl->in_hslen )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate verify message" ) );
- return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY );
- }
- /*
- * Hash
- */
- md_alg = mbedtls_ssl_md_alg_from_hash( ssl->in_msg[i] );
- if( md_alg == MBEDTLS_MD_NONE || mbedtls_ssl_set_calc_verify_md( ssl, ssl->in_msg[i] ) )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "peer not adhering to requested sig_alg"
- " for verify message" ) );
- return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY );
- }
- #if !defined(MBEDTLS_MD_SHA1)
- if( MBEDTLS_MD_SHA1 == md_alg )
- hash_start += 16;
- #endif
- /* Info from md_alg will be used instead */
- hashlen = 0;
- i++;
- /*
- * Signature
- */
- if( ( pk_alg = mbedtls_ssl_pk_alg_from_sig( ssl->in_msg[i] ) )
- == MBEDTLS_PK_NONE )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "peer not adhering to requested sig_alg"
- " for verify message" ) );
- return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY );
- }
- /*
- * Check the certificate's key type matches the signature alg
- */
- if( ! mbedtls_pk_can_do( &ssl->session_negotiate->peer_cert->pk, pk_alg ) )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "sig_alg doesn't match cert key" ) );
- return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY );
- }
- i++;
- }
- else
- #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
- return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
- }
- if( i + 2 > ssl->in_hslen )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate verify message" ) );
- return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY );
- }
- sig_len = ( ssl->in_msg[i] << 8 ) | ssl->in_msg[i+1];
- i += 2;
- if( i + sig_len != ssl->in_hslen )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate verify message" ) );
- return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY );
- }
- /* Calculate hash and verify signature */
- ssl->handshake->calc_verify( ssl, hash );
- if( ( ret = mbedtls_pk_verify( &ssl->session_negotiate->peer_cert->pk,
- md_alg, hash_start, hashlen,
- ssl->in_msg + i, sig_len ) ) != 0 )
- {
- MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_pk_verify", ret );
- return( ret );
- }
- mbedtls_ssl_update_handshake_status( ssl );
- MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse certificate verify" ) );
- return( ret );
- }
- #endif /* !MBEDTLS_KEY_EXCHANGE_RSA_ENABLED &&
- !MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED &&
- !MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED &&
- !MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED &&
- !MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED &&
- !MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED */
- #if defined(MBEDTLS_SSL_SESSION_TICKETS)
- static int ssl_write_new_session_ticket( mbedtls_ssl_context *ssl )
- {
- int ret;
- size_t tlen;
- uint32_t lifetime;
- MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write new session ticket" ) );
- ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
- ssl->out_msg[0] = MBEDTLS_SSL_HS_NEW_SESSION_TICKET;
- /*
- * struct {
- * uint32 ticket_lifetime_hint;
- * opaque ticket<0..2^16-1>;
- * } NewSessionTicket;
- *
- * 4 . 7 ticket_lifetime_hint (0 = unspecified)
- * 8 . 9 ticket_len (n)
- * 10 . 9+n ticket content
- */
- if( ( ret = ssl->conf->f_ticket_write( ssl->conf->p_ticket,
- ssl->session_negotiate,
- ssl->out_msg + 10,
- ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN,
- &tlen, &lifetime ) ) != 0 )
- {
- MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_ticket_write", ret );
- tlen = 0;
- }
- ssl->out_msg[4] = ( lifetime >> 24 ) & 0xFF;
- ssl->out_msg[5] = ( lifetime >> 16 ) & 0xFF;
- ssl->out_msg[6] = ( lifetime >> 8 ) & 0xFF;
- ssl->out_msg[7] = ( lifetime ) & 0xFF;
- ssl->out_msg[8] = (unsigned char)( ( tlen >> 8 ) & 0xFF );
- ssl->out_msg[9] = (unsigned char)( ( tlen ) & 0xFF );
- ssl->out_msglen = 10 + tlen;
- /*
- * Morally equivalent to updating ssl->state, but NewSessionTicket and
- * ChangeCipherSpec share the same state.
- */
- ssl->handshake->new_session_ticket = 0;
- if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 )
- {
- MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret );
- return( ret );
- }
- MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write new session ticket" ) );
- return( 0 );
- }
- #endif /* MBEDTLS_SSL_SESSION_TICKETS */
- /*
- * SSL handshake -- server side -- single step
- */
- int mbedtls_ssl_handshake_server_step( mbedtls_ssl_context *ssl )
- {
- int ret = 0;
- if( ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER || ssl->handshake == NULL )
- return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
- MBEDTLS_SSL_DEBUG_MSG( 2, ( "server state: %d", ssl->state ) );
- if( ( ret = mbedtls_ssl_flush_output( ssl ) ) != 0 )
- return( ret );
- #if defined(MBEDTLS_SSL_PROTO_DTLS)
- if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
- ssl->handshake->retransmit_state == MBEDTLS_SSL_RETRANS_SENDING )
- {
- if( ( ret = mbedtls_ssl_resend( ssl ) ) != 0 )
- return( ret );
- }
- #endif
- switch( ssl->state )
- {
- case MBEDTLS_SSL_HELLO_REQUEST:
- ssl->state = MBEDTLS_SSL_CLIENT_HELLO;
- break;
- /*
- * <== ClientHello
- */
- case MBEDTLS_SSL_CLIENT_HELLO:
- ret = ssl_parse_client_hello( ssl );
- break;
- #if defined(MBEDTLS_SSL_PROTO_DTLS)
- case MBEDTLS_SSL_SERVER_HELLO_VERIFY_REQUEST_SENT:
- return( MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED );
- #endif
- /*
- * ==> ServerHello
- * Certificate
- * ( ServerKeyExchange )
- * ( CertificateRequest )
- * ServerHelloDone
- */
- case MBEDTLS_SSL_SERVER_HELLO:
- ret = ssl_write_server_hello( ssl );
- break;
- case MBEDTLS_SSL_SERVER_CERTIFICATE:
- ret = mbedtls_ssl_write_certificate( ssl );
- break;
- case MBEDTLS_SSL_SERVER_KEY_EXCHANGE:
- ret = ssl_write_server_key_exchange( ssl );
- break;
- case MBEDTLS_SSL_CERTIFICATE_REQUEST:
- ret = ssl_write_certificate_request( ssl );
- break;
- case MBEDTLS_SSL_SERVER_HELLO_DONE:
- ret = ssl_write_server_hello_done( ssl );
- break;
- /*
- * <== ( Certificate/Alert )
- * ClientKeyExchange
- * ( CertificateVerify )
- * ChangeCipherSpec
- * Finished
- */
- case MBEDTLS_SSL_CLIENT_CERTIFICATE:
- ret = mbedtls_ssl_parse_certificate( ssl );
- break;
- case MBEDTLS_SSL_CLIENT_KEY_EXCHANGE:
- ret = ssl_parse_client_key_exchange( ssl );
- break;
- case MBEDTLS_SSL_CERTIFICATE_VERIFY:
- ret = ssl_parse_certificate_verify( ssl );
- break;
- case MBEDTLS_SSL_CLIENT_CHANGE_CIPHER_SPEC:
- ret = mbedtls_ssl_parse_change_cipher_spec( ssl );
- break;
- case MBEDTLS_SSL_CLIENT_FINISHED:
- ret = mbedtls_ssl_parse_finished( ssl );
- break;
- /*
- * ==> ( NewSessionTicket )
- * ChangeCipherSpec
- * Finished
- */
- case MBEDTLS_SSL_SERVER_CHANGE_CIPHER_SPEC:
- #if defined(MBEDTLS_SSL_SESSION_TICKETS)
- if( ssl->handshake->new_session_ticket != 0 )
- ret = ssl_write_new_session_ticket( ssl );
- else
- #endif
- ret = mbedtls_ssl_write_change_cipher_spec( ssl );
- break;
- case MBEDTLS_SSL_SERVER_FINISHED:
- ret = mbedtls_ssl_write_finished( ssl );
- break;
- case MBEDTLS_SSL_FLUSH_BUFFERS:
- MBEDTLS_SSL_DEBUG_MSG( 2, ( "handshake: done" ) );
- ssl->state = MBEDTLS_SSL_HANDSHAKE_WRAPUP;
- break;
- case MBEDTLS_SSL_HANDSHAKE_WRAPUP:
- mbedtls_ssl_handshake_wrapup( ssl );
- break;
- default:
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "invalid state %d", ssl->state ) );
- return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
- }
- return( ret );
- }
- #endif /* MBEDTLS_SSL_SRV_C */
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