/* Copyright (c) 2016, Google Inc. * * Permission to use, copy, modify, and/or distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #include #include #include #include #include #include #include #include #include #include "../crypto/internal.h" #include "internal.h" enum client_hs_state_t { state_process_hello_retry_request = 0, state_send_second_client_hello, state_process_server_hello, state_process_change_cipher_spec, state_process_encrypted_extensions, state_continue_second_server_flight, state_process_certificate_request, state_process_server_certificate, state_process_server_certificate_verify, state_process_server_finished, state_send_end_of_early_data, state_send_client_certificate, state_send_client_certificate_verify, state_complete_second_flight, state_done, }; static const uint8_t kZeroes[EVP_MAX_MD_SIZE] = {0}; static enum ssl_hs_wait_t do_process_hello_retry_request(SSL_HANDSHAKE *hs) { SSL *const ssl = hs->ssl; if (ssl->s3->tmp.message_type != SSL3_MT_HELLO_RETRY_REQUEST) { hs->tls13_state = state_process_server_hello; return ssl_hs_ok; } CBS cbs, extensions; uint16_t server_version; CBS_init(&cbs, ssl->init_msg, ssl->init_num); if (!CBS_get_u16(&cbs, &server_version) || !CBS_get_u16_length_prefixed(&cbs, &extensions) || /* HelloRetryRequest may not be empty. */ CBS_len(&extensions) == 0 || CBS_len(&cbs) != 0) { OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); return ssl_hs_error; } int have_cookie, have_key_share; CBS cookie, key_share; const SSL_EXTENSION_TYPE ext_types[] = { {TLSEXT_TYPE_key_share, &have_key_share, &key_share}, {TLSEXT_TYPE_cookie, &have_cookie, &cookie}, }; uint8_t alert = SSL_AD_DECODE_ERROR; if (!ssl_parse_extensions(&extensions, &alert, ext_types, OPENSSL_ARRAY_SIZE(ext_types), 0 /* reject unknown */)) { ssl3_send_alert(ssl, SSL3_AL_FATAL, alert); return ssl_hs_error; } if (have_cookie) { CBS cookie_value; if (!CBS_get_u16_length_prefixed(&cookie, &cookie_value) || CBS_len(&cookie_value) == 0 || CBS_len(&cookie) != 0) { OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); return ssl_hs_error; } if (!CBS_stow(&cookie_value, &hs->cookie, &hs->cookie_len)) { return ssl_hs_error; } } if (have_key_share) { uint16_t group_id; if (!CBS_get_u16(&key_share, &group_id) || CBS_len(&key_share) != 0) { OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); return ssl_hs_error; } /* The group must be supported. */ const uint16_t *groups; size_t groups_len; tls1_get_grouplist(ssl, &groups, &groups_len); int found = 0; for (size_t i = 0; i < groups_len; i++) { if (groups[i] == group_id) { found = 1; break; } } if (!found) { ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER); OPENSSL_PUT_ERROR(SSL, SSL_R_WRONG_CURVE); return ssl_hs_error; } /* Check that the HelloRetryRequest does not request the key share that * was provided in the initial ClientHello. */ if (SSL_ECDH_CTX_get_id(&hs->ecdh_ctx) == group_id) { ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER); OPENSSL_PUT_ERROR(SSL, SSL_R_WRONG_CURVE); return ssl_hs_error; } SSL_ECDH_CTX_cleanup(&hs->ecdh_ctx); hs->retry_group = group_id; } if (!ssl_hash_current_message(hs)) { return ssl_hs_error; } hs->received_hello_retry_request = 1; hs->tls13_state = state_send_second_client_hello; /* 0-RTT is rejected if we receive a HelloRetryRequest. */ if (hs->in_early_data) { return ssl_hs_early_data_rejected; } return ssl_hs_ok; } static enum ssl_hs_wait_t do_send_second_client_hello(SSL_HANDSHAKE *hs) { SSL *const ssl = hs->ssl; if (!ssl->method->set_write_state(ssl, NULL) || !ssl_write_client_hello(hs)) { return ssl_hs_error; } hs->tls13_state = state_process_server_hello; return ssl_hs_flush_and_read_message; } static enum ssl_hs_wait_t do_process_server_hello(SSL_HANDSHAKE *hs) { SSL *const ssl = hs->ssl; if (!ssl_check_message_type(ssl, SSL3_MT_SERVER_HELLO)) { return ssl_hs_error; } CBS cbs, server_random, session_id, extensions; uint16_t server_version; uint16_t cipher_suite; uint8_t compression_method; CBS_init(&cbs, ssl->init_msg, ssl->init_num); if (!CBS_get_u16(&cbs, &server_version) || !CBS_get_bytes(&cbs, &server_random, SSL3_RANDOM_SIZE) || (ssl->version == TLS1_3_EXPERIMENT_VERSION && !CBS_get_u8_length_prefixed(&cbs, &session_id)) || !CBS_get_u16(&cbs, &cipher_suite) || (ssl->version == TLS1_3_EXPERIMENT_VERSION && (!CBS_get_u8(&cbs, &compression_method) || compression_method != 0)) || !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; } uint16_t expected_version = ssl->version == TLS1_3_EXPERIMENT_VERSION ? TLS1_2_VERSION : ssl->version; if (server_version != expected_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; } assert(ssl->s3->have_version); OPENSSL_memcpy(ssl->s3->server_random, CBS_data(&server_random), SSL3_RANDOM_SIZE); 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 a TLS 1.3 cipher. */ if (SSL_CIPHER_get_min_version(cipher) > ssl3_protocol_version(ssl) || SSL_CIPHER_get_max_version(cipher) < ssl3_protocol_version(ssl)) { OPENSSL_PUT_ERROR(SSL, SSL_R_WRONG_CIPHER_RETURNED); ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER); return ssl_hs_error; } /* Parse out the extensions. */ int have_key_share = 0, have_pre_shared_key = 0, have_supported_versions = 0; CBS key_share, pre_shared_key, supported_versions; const SSL_EXTENSION_TYPE ext_types[] = { {TLSEXT_TYPE_key_share, &have_key_share, &key_share}, {TLSEXT_TYPE_pre_shared_key, &have_pre_shared_key, &pre_shared_key}, {TLSEXT_TYPE_supported_versions, &have_supported_versions, &supported_versions}, }; uint8_t alert = SSL_AD_DECODE_ERROR; if (!ssl_parse_extensions(&extensions, &alert, ext_types, OPENSSL_ARRAY_SIZE(ext_types), 0 /* reject unknown */)) { ssl3_send_alert(ssl, SSL3_AL_FATAL, alert); return ssl_hs_error; } /* supported_versions is parsed in handshake_client to select the experimental * TLS 1.3 version. */ if (have_supported_versions && ssl->version != TLS1_3_EXPERIMENT_VERSION) { OPENSSL_PUT_ERROR(SSL, SSL_R_UNEXPECTED_EXTENSION); ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_UNSUPPORTED_EXTENSION); return ssl_hs_error; } alert = SSL_AD_DECODE_ERROR; if (have_pre_shared_key) { if (ssl->session == NULL) { OPENSSL_PUT_ERROR(SSL, SSL_R_UNEXPECTED_EXTENSION); ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_UNSUPPORTED_EXTENSION); return ssl_hs_error; } if (!ssl_ext_pre_shared_key_parse_serverhello(hs, &alert, &pre_shared_key)) { ssl3_send_alert(ssl, SSL3_AL_FATAL, alert); return ssl_hs_error; } if (ssl->session->ssl_version != ssl->version) { OPENSSL_PUT_ERROR(SSL, SSL_R_OLD_SESSION_VERSION_NOT_RETURNED); ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER); return ssl_hs_error; } if (ssl->session->cipher->algorithm_prf != cipher->algorithm_prf) { OPENSSL_PUT_ERROR(SSL, SSL_R_OLD_SESSION_PRF_HASH_MISMATCH); ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER); return ssl_hs_error; } if (!ssl_session_is_context_valid(ssl, ssl->session)) { /* This is actually a client application bug. */ OPENSSL_PUT_ERROR(SSL, SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT); ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER); return ssl_hs_error; } ssl->s3->session_reused = 1; /* Only authentication information carries over in TLS 1.3. */ hs->new_session = SSL_SESSION_dup(ssl->session, SSL_SESSION_DUP_AUTH_ONLY); if (hs->new_session == NULL) { ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); return ssl_hs_error; } ssl_set_session(ssl, NULL); /* Resumption incorporates fresh key material, so refresh the timeout. */ ssl_session_renew_timeout(ssl, hs->new_session, ssl->session_ctx->session_psk_dhe_timeout); } else if (!ssl_get_new_session(hs, 0)) { ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); return ssl_hs_error; } hs->new_session->cipher = cipher; hs->new_cipher = cipher; /* The PRF hash is now known. Set up the key schedule. */ if (!tls13_init_key_schedule(hs)) { return ssl_hs_error; } /* Incorporate the PSK into the running secret. */ if (ssl->s3->session_reused) { if (!tls13_advance_key_schedule(hs, hs->new_session->master_key, hs->new_session->master_key_length)) { return ssl_hs_error; } } else if (!tls13_advance_key_schedule(hs, kZeroes, hs->hash_len)) { return ssl_hs_error; } if (!have_key_share) { /* We do not support psk_ke and thus always require a 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; } /* Resolve ECDHE and incorporate it into the secret. */ uint8_t *dhe_secret; size_t dhe_secret_len; alert = SSL_AD_DECODE_ERROR; if (!ssl_ext_key_share_parse_serverhello(hs, &dhe_secret, &dhe_secret_len, &alert, &key_share)) { ssl3_send_alert(ssl, SSL3_AL_FATAL, alert); return ssl_hs_error; } if (!tls13_advance_key_schedule(hs, dhe_secret, dhe_secret_len)) { OPENSSL_free(dhe_secret); return ssl_hs_error; } OPENSSL_free(dhe_secret); if (!ssl_hash_current_message(hs) || !tls13_derive_handshake_secrets(hs)) { return ssl_hs_error; } hs->tls13_state = state_process_change_cipher_spec; return ssl->version == TLS1_3_EXPERIMENT_VERSION ? ssl_hs_read_change_cipher_spec : ssl_hs_ok; } static enum ssl_hs_wait_t do_process_change_cipher_spec(SSL_HANDSHAKE *hs) { SSL *const ssl = hs->ssl; if (!tls13_set_traffic_key(ssl, evp_aead_open, hs->server_handshake_secret, hs->hash_len)) { return ssl_hs_error; } if (!hs->early_data_offered) { /* If not sending early data, set client traffic keys now so that alerts are * encrypted. */ if ((ssl->version == TLS1_3_EXPERIMENT_VERSION && !ssl3_add_change_cipher_spec(ssl)) || !tls13_set_traffic_key(ssl, evp_aead_seal, hs->client_handshake_secret, hs->hash_len)) { return ssl_hs_error; } } hs->tls13_state = state_process_encrypted_extensions; return ssl_hs_read_message; } static enum ssl_hs_wait_t do_process_encrypted_extensions(SSL_HANDSHAKE *hs) { SSL *const ssl = hs->ssl; if (!ssl_check_message_type(ssl, SSL3_MT_ENCRYPTED_EXTENSIONS)) { return ssl_hs_error; } CBS cbs; CBS_init(&cbs, ssl->init_msg, ssl->init_num); if (!ssl_parse_serverhello_tlsext(hs, &cbs)) { OPENSSL_PUT_ERROR(SSL, SSL_R_PARSE_TLSEXT); return ssl_hs_error; } if (CBS_len(&cbs) != 0) { OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); return ssl_hs_error; } /* Store the negotiated ALPN in the session. */ if (ssl->s3->alpn_selected != NULL) { hs->new_session->early_alpn = (uint8_t *)BUF_memdup( ssl->s3->alpn_selected, ssl->s3->alpn_selected_len); if (hs->new_session->early_alpn == NULL) { ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); return ssl_hs_error; } hs->new_session->early_alpn_len = ssl->s3->alpn_selected_len; } if (ssl->early_data_accepted) { if (hs->early_session->cipher != hs->new_session->cipher || hs->early_session->early_alpn_len != ssl->s3->alpn_selected_len || OPENSSL_memcmp(hs->early_session->early_alpn, ssl->s3->alpn_selected, ssl->s3->alpn_selected_len) != 0) { OPENSSL_PUT_ERROR(SSL, SSL_R_ALPN_MISMATCH_ON_EARLY_DATA); return ssl_hs_error; } if (ssl->s3->tlsext_channel_id_valid) { OPENSSL_PUT_ERROR(SSL, SSL_R_CHANNEL_ID_ON_EARLY_DATA); return ssl_hs_error; } } if (!ssl_hash_current_message(hs)) { return ssl_hs_error; } hs->tls13_state = state_continue_second_server_flight; if (hs->in_early_data && !ssl->early_data_accepted) { return ssl_hs_early_data_rejected; } return ssl_hs_ok; } static enum ssl_hs_wait_t do_continue_second_server_flight(SSL_HANDSHAKE *hs) { hs->tls13_state = state_process_certificate_request; return ssl_hs_read_message; } static enum ssl_hs_wait_t do_process_certificate_request(SSL_HANDSHAKE *hs) { SSL *const ssl = hs->ssl; /* CertificateRequest may only be sent in non-resumption handshakes. */ if (ssl->s3->session_reused) { hs->tls13_state = state_process_server_finished; return ssl_hs_ok; } /* CertificateRequest is optional. */ if (ssl->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST) { hs->tls13_state = state_process_server_certificate; return ssl_hs_ok; } CBS cbs, context, supported_signature_algorithms; CBS_init(&cbs, ssl->init_msg, ssl->init_num); if (!CBS_get_u8_length_prefixed(&cbs, &context) || /* The request context is always empty during the handshake. */ CBS_len(&context) != 0 || !CBS_get_u16_length_prefixed(&cbs, &supported_signature_algorithms) || CBS_len(&supported_signature_algorithms) == 0 || !tls1_parse_peer_sigalgs(hs, &supported_signature_algorithms)) { ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); return ssl_hs_error; } uint8_t alert = SSL_AD_DECODE_ERROR; STACK_OF(CRYPTO_BUFFER) *ca_names = ssl_parse_client_CA_list(ssl, &alert, &cbs); if (ca_names == NULL) { ssl3_send_alert(ssl, SSL3_AL_FATAL, alert); return ssl_hs_error; } /* Ignore extensions. */ CBS extensions; if (!CBS_get_u16_length_prefixed(&cbs, &extensions) || CBS_len(&cbs) != 0) { ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); sk_CRYPTO_BUFFER_pop_free(ca_names, CRYPTO_BUFFER_free); OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); return ssl_hs_error; } hs->cert_request = 1; sk_CRYPTO_BUFFER_pop_free(hs->ca_names, CRYPTO_BUFFER_free); hs->ca_names = ca_names; ssl->ctx->x509_method->hs_flush_cached_ca_names(hs); if (!ssl_hash_current_message(hs)) { return ssl_hs_error; } hs->tls13_state = state_process_server_certificate; return ssl_hs_read_message; } static enum ssl_hs_wait_t do_process_server_certificate(SSL_HANDSHAKE *hs) { SSL *const ssl = hs->ssl; if (!ssl_check_message_type(ssl, SSL3_MT_CERTIFICATE) || !tls13_process_certificate(hs, 0 /* certificate required */) || !ssl_hash_current_message(hs)) { return ssl_hs_error; } hs->tls13_state = state_process_server_certificate_verify; return ssl_hs_read_message; } static enum ssl_hs_wait_t do_process_server_certificate_verify( SSL_HANDSHAKE *hs) { SSL *const ssl = hs->ssl; if (!ssl_check_message_type(ssl, SSL3_MT_CERTIFICATE_VERIFY) || !tls13_process_certificate_verify(hs) || !ssl_hash_current_message(hs)) { return ssl_hs_error; } hs->tls13_state = state_process_server_finished; return ssl_hs_read_message; } static enum ssl_hs_wait_t do_process_server_finished(SSL_HANDSHAKE *hs) { SSL *const ssl = hs->ssl; if (!ssl_check_message_type(ssl, SSL3_MT_FINISHED) || !tls13_process_finished(hs, 0 /* don't use saved value */) || !ssl_hash_current_message(hs) || /* Update the secret to the master secret and derive traffic keys. */ !tls13_advance_key_schedule(hs, kZeroes, hs->hash_len) || !tls13_derive_application_secrets(hs)) { return ssl_hs_error; } ssl->method->received_flight(ssl); hs->tls13_state = state_send_end_of_early_data; return ssl_hs_ok; } static enum ssl_hs_wait_t do_send_end_of_early_data(SSL_HANDSHAKE *hs) { SSL *const ssl = hs->ssl; if (ssl->early_data_accepted) { hs->can_early_write = 0; if (!ssl->method->add_alert(ssl, SSL3_AL_WARNING, TLS1_AD_END_OF_EARLY_DATA)) { return ssl_hs_error; } } if (hs->early_data_offered) { if ((ssl->version == TLS1_3_EXPERIMENT_VERSION && !ssl3_add_change_cipher_spec(ssl)) || !tls13_set_traffic_key(ssl, evp_aead_seal, hs->client_handshake_secret, hs->hash_len)) { return ssl_hs_error; } } hs->tls13_state = state_send_client_certificate; return ssl_hs_ok; } static enum ssl_hs_wait_t do_send_client_certificate(SSL_HANDSHAKE *hs) { SSL *const ssl = hs->ssl; /* The peer didn't request a certificate. */ if (!hs->cert_request) { hs->tls13_state = state_complete_second_flight; return ssl_hs_ok; } /* Call cert_cb to update the certificate. */ if (ssl->cert->cert_cb != NULL) { int rv = ssl->cert->cert_cb(ssl, ssl->cert->cert_cb_arg); if (rv == 0) { ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); OPENSSL_PUT_ERROR(SSL, SSL_R_CERT_CB_ERROR); return ssl_hs_error; } if (rv < 0) { hs->tls13_state = state_send_client_certificate; return ssl_hs_x509_lookup; } } if (!ssl_on_certificate_selected(hs) || !tls13_add_certificate(hs)) { return ssl_hs_error; } hs->tls13_state = state_send_client_certificate_verify; return ssl_hs_ok; } static enum ssl_hs_wait_t do_send_client_certificate_verify(SSL_HANDSHAKE *hs) { SSL *const ssl = hs->ssl; /* Don't send CertificateVerify if there is no certificate. */ if (!ssl_has_certificate(ssl)) { hs->tls13_state = state_complete_second_flight; return ssl_hs_ok; } switch (tls13_add_certificate_verify(hs)) { case ssl_private_key_success: hs->tls13_state = state_complete_second_flight; return ssl_hs_ok; case ssl_private_key_retry: hs->tls13_state = state_send_client_certificate_verify; return ssl_hs_private_key_operation; case ssl_private_key_failure: return ssl_hs_error; } assert(0); return ssl_hs_error; } static enum ssl_hs_wait_t do_complete_second_flight(SSL_HANDSHAKE *hs) { SSL *const ssl = hs->ssl; /* Send a Channel ID assertion if necessary. */ if (ssl->s3->tlsext_channel_id_valid) { if (!ssl_do_channel_id_callback(ssl)) { hs->tls13_state = state_complete_second_flight; return ssl_hs_error; } if (ssl->tlsext_channel_id_private == NULL) { return ssl_hs_channel_id_lookup; } CBB cbb, body; if (!ssl->method->init_message(ssl, &cbb, &body, SSL3_MT_CHANNEL_ID) || !tls1_write_channel_id(hs, &body) || !ssl_add_message_cbb(ssl, &cbb)) { CBB_cleanup(&cbb); return ssl_hs_error; } } /* Send a Finished message. */ if (!tls13_add_finished(hs)) { return ssl_hs_error; } /* Derive the final keys and enable them. */ if (!tls13_set_traffic_key(ssl, evp_aead_open, hs->server_traffic_secret_0, hs->hash_len) || !tls13_set_traffic_key(ssl, evp_aead_seal, hs->client_traffic_secret_0, hs->hash_len) || !tls13_derive_resumption_secret(hs)) { return ssl_hs_error; } hs->tls13_state = state_done; return ssl_hs_flush; } enum ssl_hs_wait_t tls13_client_handshake(SSL_HANDSHAKE *hs) { while (hs->tls13_state != state_done) { enum ssl_hs_wait_t ret = ssl_hs_error; enum client_hs_state_t state = static_cast(hs->tls13_state); switch (state) { case state_process_hello_retry_request: ret = do_process_hello_retry_request(hs); break; case state_send_second_client_hello: ret = do_send_second_client_hello(hs); break; case state_process_server_hello: ret = do_process_server_hello(hs); break; case state_process_change_cipher_spec: ret = do_process_change_cipher_spec(hs); break; case state_process_encrypted_extensions: ret = do_process_encrypted_extensions(hs); break; case state_continue_second_server_flight: ret = do_continue_second_server_flight(hs); break; case state_process_certificate_request: ret = do_process_certificate_request(hs); break; case state_process_server_certificate: ret = do_process_server_certificate(hs); break; case state_process_server_certificate_verify: ret = do_process_server_certificate_verify(hs); break; case state_process_server_finished: ret = do_process_server_finished(hs); break; case state_send_end_of_early_data: ret = do_send_end_of_early_data(hs); break; case state_send_client_certificate: ret = do_send_client_certificate(hs); break; case state_send_client_certificate_verify: ret = do_send_client_certificate_verify(hs); break; case state_complete_second_flight: ret = do_complete_second_flight(hs); break; case state_done: ret = ssl_hs_ok; break; } if (ret != ssl_hs_ok) { return ret; } } return ssl_hs_ok; } int tls13_process_new_session_ticket(SSL *ssl) { bssl::UniquePtr session(SSL_SESSION_dup( ssl->s3->established_session, SSL_SESSION_INCLUDE_NONAUTH)); if (!session) { return 0; } ssl_session_rebase_time(ssl, session.get()); uint32_t server_timeout; CBS cbs, ticket, extensions; CBS_init(&cbs, ssl->init_msg, ssl->init_num); if (!CBS_get_u32(&cbs, &server_timeout) || !CBS_get_u32(&cbs, &session->ticket_age_add) || !CBS_get_u16_length_prefixed(&cbs, &ticket) || !CBS_stow(&ticket, &session->tlsext_tick, &session->tlsext_ticklen) || !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 0; } /* Cap the renewable lifetime by the server advertised value. This avoids * wasting bandwidth on 0-RTT when we know the server will reject it. */ if (session->timeout > server_timeout) { session->timeout = server_timeout; } /* Parse out the extensions. */ int have_early_data_info = 0; CBS early_data_info; const SSL_EXTENSION_TYPE ext_types[] = { {TLSEXT_TYPE_ticket_early_data_info, &have_early_data_info, &early_data_info}, }; uint8_t alert = SSL_AD_DECODE_ERROR; if (!ssl_parse_extensions(&extensions, &alert, ext_types, OPENSSL_ARRAY_SIZE(ext_types), 1 /* ignore unknown */)) { ssl3_send_alert(ssl, SSL3_AL_FATAL, alert); return 0; } if (have_early_data_info && ssl->cert->enable_early_data) { if (!CBS_get_u32(&early_data_info, &session->ticket_max_early_data) || CBS_len(&early_data_info) != 0) { ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); return 0; } } session->ticket_age_add_valid = 1; session->not_resumable = 0; if (ssl->ctx->new_session_cb != NULL && ssl->ctx->new_session_cb(ssl, session.get())) { /* |new_session_cb|'s return value signals that it took ownership. */ session.release(); } return 1; } void ssl_clear_tls13_state(SSL_HANDSHAKE *hs) { SSL_ECDH_CTX_cleanup(&hs->ecdh_ctx); OPENSSL_free(hs->key_share_bytes); hs->key_share_bytes = NULL; hs->key_share_bytes_len = 0; }