static enum ssl_hs_wait_t do_select_parameters(SSL_HANDSHAKE *hs) { /* At this point, most ClientHello extensions have already been processed by * the common handshake logic. Resolve the remaining non-PSK parameters. */ SSL *const ssl = hs->ssl; SSL_CLIENT_HELLO client_hello; if (!ssl_client_hello_init(ssl, &client_hello, ssl->init_msg, ssl->init_num)) { OPENSSL_PUT_ERROR(SSL, SSL_R_CLIENTHELLO_PARSE_FAILED); ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); return ssl_hs_error; } /* Negotiate the cipher suite. */ hs->new_cipher = choose_tls13_cipher(ssl, &client_hello); if (hs->new_cipher == NULL) { OPENSSL_PUT_ERROR(SSL, SSL_R_NO_SHARED_CIPHER); ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); return ssl_hs_error; } /* HTTP/2 negotiation depends on the cipher suite, so ALPN negotiation was * deferred. Complete it now. */ uint8_t alert = SSL_AD_DECODE_ERROR; if (!ssl_negotiate_alpn(hs, &alert, &client_hello)) { ssl3_send_alert(ssl, SSL3_AL_FATAL, alert); return ssl_hs_error; } /* The PRF hash is now known. Set up the key schedule and hash the * ClientHello. */ if (!tls13_init_key_schedule(hs) || !ssl_hash_current_message(hs)) { return ssl_hs_error; } hs->tls13_state = state_select_session; return ssl_hs_ok; }
static enum ssl_hs_wait_t do_select_parameters(SSL *ssl, SSL_HANDSHAKE *hs) { /* Call |cert_cb| to update server certificates if required. */ if (ssl->cert->cert_cb != NULL) { int rv = ssl->cert->cert_cb(ssl, ssl->cert->cert_cb_arg); if (rv == 0) { OPENSSL_PUT_ERROR(SSL, SSL_R_CERT_CB_ERROR); ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); return ssl_hs_error; } if (rv < 0) { hs->state = state_select_parameters; return ssl_hs_x509_lookup; } } struct ssl_early_callback_ctx client_hello; if (!ssl_early_callback_init(ssl, &client_hello, ssl->init_msg, ssl->init_num)) { OPENSSL_PUT_ERROR(SSL, SSL_R_CLIENTHELLO_PARSE_FAILED); ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); return ssl_hs_error; } const SSL_CIPHER *cipher = ssl3_choose_cipher(ssl, &client_hello, ssl_get_cipher_preferences(ssl)); if (cipher == NULL) { OPENSSL_PUT_ERROR(SSL, SSL_R_NO_SHARED_CIPHER); ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); return ssl_hs_error; } ssl->s3->new_session->cipher = cipher; ssl->s3->tmp.new_cipher = cipher; ssl->method->received_flight(ssl); /* The PRF hash is now known. Set up the key schedule and hash the * ClientHello. */ size_t hash_len = EVP_MD_size(ssl_get_handshake_digest(ssl_get_algorithm_prf(ssl))); if (!tls13_init_key_schedule(ssl, kZeroes, hash_len)) { return ssl_hs_error; } /* Resolve PSK and incorporate it into the secret. */ if (!resolve_psk_secret(ssl)) { return ssl_hs_error; } /* Resolve ECDHE and incorporate it into the secret. */ int need_retry; if (!resolve_ecdhe_secret(ssl, &need_retry, &client_hello)) { if (need_retry) { hs->state = state_send_hello_retry_request; return ssl_hs_ok; } return ssl_hs_error; } hs->state = state_send_server_hello; return ssl_hs_ok; }
static enum ssl_hs_wait_t do_process_server_hello(SSL *ssl, SSL_HANDSHAKE *hs) { if (!tls13_check_message_type(ssl, SSL3_MT_SERVER_HELLO)) { return ssl_hs_error; } CBS cbs, server_random, extensions; uint16_t server_wire_version; uint16_t cipher_suite; CBS_init(&cbs, ssl->init_msg, ssl->init_num); if (!CBS_get_u16(&cbs, &server_wire_version) || !CBS_get_bytes(&cbs, &server_random, SSL3_RANDOM_SIZE) || !CBS_get_u16(&cbs, &cipher_suite) || !CBS_get_u16_length_prefixed(&cbs, &extensions) || CBS_len(&cbs) != 0) { ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); return ssl_hs_error; } if (server_wire_version != ssl->version) { ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); OPENSSL_PUT_ERROR(SSL, SSL_R_WRONG_VERSION_NUMBER); return ssl_hs_error; } /* Parse out the extensions. */ int have_key_share = 0; CBS key_share; while (CBS_len(&extensions) != 0) { uint16_t type; CBS extension; if (!CBS_get_u16(&extensions, &type) || !CBS_get_u16_length_prefixed(&extensions, &extension)) { OPENSSL_PUT_ERROR(SSL, SSL_R_PARSE_TLSEXT); ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); return ssl_hs_error; } switch (type) { case TLSEXT_TYPE_key_share: if (have_key_share) { OPENSSL_PUT_ERROR(SSL, SSL_R_DUPLICATE_EXTENSION); ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); return ssl_hs_error; } key_share = extension; have_key_share = 1; break; default: OPENSSL_PUT_ERROR(SSL, SSL_R_UNEXPECTED_EXTENSION); ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_UNSUPPORTED_EXTENSION); return ssl_hs_error; } } assert(ssl->s3->have_version); memcpy(ssl->s3->server_random, CBS_data(&server_random), SSL3_RANDOM_SIZE); ssl->hit = 0; if (!ssl_get_new_session(ssl, 0)) { ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); return ssl_hs_error; } const SSL_CIPHER *cipher = SSL_get_cipher_by_value(cipher_suite); if (cipher == NULL) { OPENSSL_PUT_ERROR(SSL, SSL_R_UNKNOWN_CIPHER_RETURNED); ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER); return ssl_hs_error; } /* Check if the cipher is disabled. */ if ((cipher->algorithm_mkey & ssl->cert->mask_k) || (cipher->algorithm_auth & ssl->cert->mask_a) || SSL_CIPHER_get_min_version(cipher) > ssl3_protocol_version(ssl) || SSL_CIPHER_get_max_version(cipher) < ssl3_protocol_version(ssl) || !sk_SSL_CIPHER_find(ssl_get_ciphers_by_id(ssl), NULL, cipher)) { OPENSSL_PUT_ERROR(SSL, SSL_R_WRONG_CIPHER_RETURNED); ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER); return ssl_hs_error; } ssl->session->cipher = cipher; ssl->s3->tmp.new_cipher = cipher; /* The PRF hash is now known. Set up the key schedule. */ static const uint8_t kZeroes[EVP_MAX_MD_SIZE] = {0}; size_t hash_len = EVP_MD_size(ssl_get_handshake_digest(ssl_get_algorithm_prf(ssl))); if (!tls13_init_key_schedule(ssl, kZeroes, hash_len)) { return ssl_hs_error; } /* Resolve PSK and incorporate it into the secret. */ if (cipher->algorithm_auth == SSL_aPSK) { /* TODO(davidben): Support PSK. */ OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); return ssl_hs_error; } else if (!tls13_advance_key_schedule(ssl, kZeroes, hash_len)) { return ssl_hs_error; } /* Resolve ECDHE and incorporate it into the secret. */ if (cipher->algorithm_mkey == SSL_kECDHE) { if (!have_key_share) { OPENSSL_PUT_ERROR(SSL, SSL_R_MISSING_KEY_SHARE); ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_MISSING_EXTENSION); return ssl_hs_error; } uint8_t *dhe_secret; size_t dhe_secret_len; uint8_t alert = SSL_AD_DECODE_ERROR; if (!ext_key_share_parse_serverhello(ssl, &dhe_secret, &dhe_secret_len, &alert, &key_share)) { ssl3_send_alert(ssl, SSL3_AL_FATAL, alert); return ssl_hs_error; } int ok = tls13_advance_key_schedule(ssl, dhe_secret, dhe_secret_len); OPENSSL_free(dhe_secret); if (!ok) { return ssl_hs_error; } } else { if (have_key_share) { OPENSSL_PUT_ERROR(SSL, SSL_R_UNEXPECTED_EXTENSION); ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_UNSUPPORTED_EXTENSION); return ssl_hs_error; } if (!tls13_advance_key_schedule(ssl, kZeroes, hash_len)) { return ssl_hs_error; } } /* If there was no HelloRetryRequest, the version negotiation logic has * already hashed the message. */ if (ssl->s3->hs->retry_group != 0 && !ssl->method->hash_current_message(ssl)) { return ssl_hs_error; } if (!tls13_set_handshake_traffic(ssl)) { return ssl_hs_error; } hs->state = state_process_encrypted_extensions; return ssl_hs_read_message; }
static enum ssl_hs_wait_t do_select_parameters(SSL_HANDSHAKE *hs) { SSL *const ssl = hs->ssl; /* The short record header extension is incompatible with early data. */ if (ssl->s3->skip_early_data && ssl->s3->short_header) { OPENSSL_PUT_ERROR(SSL, SSL_R_UNEXPECTED_EXTENSION); return ssl_hs_error; } SSL_CLIENT_HELLO client_hello; if (!ssl_client_hello_init(ssl, &client_hello, ssl->init_msg, ssl->init_num)) { OPENSSL_PUT_ERROR(SSL, SSL_R_CLIENTHELLO_PARSE_FAILED); ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); return ssl_hs_error; } /* Negotiate the cipher suite. */ ssl->s3->tmp.new_cipher = choose_tls13_cipher(ssl, &client_hello); if (ssl->s3->tmp.new_cipher == NULL) { OPENSSL_PUT_ERROR(SSL, SSL_R_NO_SHARED_CIPHER); ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); return ssl_hs_error; } /* Decode the ticket if we agree on a PSK key exchange mode. */ uint8_t alert = SSL_AD_DECODE_ERROR; SSL_SESSION *session = NULL; CBS pre_shared_key, binders; if (hs->accept_psk_mode && ssl_client_hello_get_extension(&client_hello, &pre_shared_key, TLSEXT_TYPE_pre_shared_key)) { /* Verify that the pre_shared_key extension is the last extension in * ClientHello. */ if (CBS_data(&pre_shared_key) + CBS_len(&pre_shared_key) != client_hello.extensions + client_hello.extensions_len) { OPENSSL_PUT_ERROR(SSL, SSL_R_PRE_SHARED_KEY_MUST_BE_LAST); ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER); return ssl_hs_error; } if (!ssl_ext_pre_shared_key_parse_clienthello(hs, &session, &binders, &alert, &pre_shared_key)) { ssl3_send_alert(ssl, SSL3_AL_FATAL, alert); return ssl_hs_error; } } if (session != NULL && !ssl_session_is_resumable(ssl, session)) { SSL_SESSION_free(session); session = NULL; } /* Set up the new session, either using the original one as a template or * creating a fresh one. */ if (session == NULL) { if (!ssl_get_new_session(hs, 1 /* server */)) { ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); return ssl_hs_error; } ssl->s3->new_session->cipher = ssl->s3->tmp.new_cipher; /* On new sessions, stash the SNI value in the session. */ if (hs->hostname != NULL) { OPENSSL_free(ssl->s3->new_session->tlsext_hostname); ssl->s3->new_session->tlsext_hostname = BUF_strdup(hs->hostname); if (ssl->s3->new_session->tlsext_hostname == NULL) { ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); return ssl_hs_error; } } } else { /* Check the PSK binder. */ if (!tls13_verify_psk_binder(ssl, session, &binders)) { SSL_SESSION_free(session); ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECRYPT_ERROR); return ssl_hs_error; } /* Only authentication information carries over in TLS 1.3. */ ssl->s3->new_session = SSL_SESSION_dup(session, SSL_SESSION_DUP_AUTH_ONLY); if (ssl->s3->new_session == NULL) { ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); return ssl_hs_error; } ssl->s3->session_reused = 1; SSL_SESSION_free(session); /* Resumption incorporates fresh key material, so refresh the timeout. */ ssl_session_renew_timeout(ssl, ssl->s3->new_session, ssl->initial_ctx->session_psk_dhe_timeout); } if (ssl->ctx->dos_protection_cb != NULL && ssl->ctx->dos_protection_cb(&client_hello) == 0) { /* Connection rejected for DOS reasons. */ OPENSSL_PUT_ERROR(SSL, SSL_R_CONNECTION_REJECTED); ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); return ssl_hs_error; } /* HTTP/2 negotiation depends on the cipher suite, so ALPN negotiation was * deferred. Complete it now. */ if (!ssl_negotiate_alpn(hs, &alert, &client_hello)) { ssl3_send_alert(ssl, SSL3_AL_FATAL, alert); return ssl_hs_error; } /* The PRF hash is now known. Set up the key schedule and hash the * ClientHello. */ size_t hash_len = EVP_MD_size(ssl_get_handshake_digest(ssl_get_algorithm_prf(ssl))); if (!tls13_init_key_schedule(hs) || !ssl_hash_current_message(ssl)) { return ssl_hs_error; } /* Incorporate the PSK into the running secret. */ if (ssl->s3->session_reused) { if (!tls13_advance_key_schedule(hs, ssl->s3->new_session->master_key, ssl->s3->new_session->master_key_length)) { return ssl_hs_error; } } else if (!tls13_advance_key_schedule(hs, kZeroes, hash_len)) { return ssl_hs_error; } ssl->method->received_flight(ssl); /* Resolve ECDHE and incorporate it into the secret. */ int need_retry; if (!resolve_ecdhe_secret(hs, &need_retry, &client_hello)) { if (need_retry) { hs->tls13_state = state_send_hello_retry_request; return ssl_hs_ok; } return ssl_hs_error; } hs->tls13_state = state_send_server_hello; return ssl_hs_ok; }