| /* 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 <openssl/ssl.h> |
| |
| #include <assert.h> |
| #include <limits.h> |
| #include <string.h> |
| |
| #include <openssl/bytestring.h> |
| #include <openssl/digest.h> |
| #include <openssl/err.h> |
| #include <openssl/mem.h> |
| #include <openssl/stack.h> |
| |
| #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_encrypted_extensions, |
| 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_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_wire_version; |
| CBS_init(&cbs, ssl->init_msg, ssl->init_num); |
| if (!CBS_get_u16(&cbs, &server_wire_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; |
| return ssl_hs_ok; |
| } |
| |
| static enum ssl_hs_wait_t do_send_second_client_hello(SSL_HANDSHAKE *hs) { |
| SSL *const ssl = hs->ssl; |
| /* TODO(svaldez): Ensure that we set can_early_write to false since 0-RTT is |
| * rejected if we receive a HelloRetryRequest. */ |
| 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, 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; |
| } |
| |
| 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; |
| CBS key_share, pre_shared_key; |
| 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}, |
| }; |
| |
| 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; |
| } |
| |
| 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; |
| } |
| |
| /* 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) || |
| !tls13_set_traffic_key(ssl, evp_aead_open, hs->server_handshake_secret, |
| hs->hash_len)) { |
| return ssl_hs_error; |
| } |
| |
| /* If not sending early data, set client traffic keys now so that alerts are |
| * encrypted. */ |
| if (!hs->early_data_offered && |
| !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 = |
| 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 (ssl->session->cipher != hs->new_session->cipher || |
| ssl->session->early_alpn_len != ssl->s3->alpn_selected_len || |
| OPENSSL_memcmp(ssl->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; |
| } |
| } |
| |
| /* Release offered session now that it is no longer needed. */ |
| if (ssl->s3->session_reused) { |
| ssl_set_session(ssl, NULL); |
| } |
| |
| if (!ssl_hash_current_message(hs)) { |
| return ssl_hs_error; |
| } |
| |
| 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; |
| /* TODO(svaldez): Stop sending early data. */ |
| if (ssl->early_data_accepted && |
| !ssl->method->add_alert(ssl, SSL3_AL_WARNING, |
| TLS1_AD_END_OF_EARLY_DATA)) { |
| return ssl_hs_error; |
| } |
| |
| if (hs->early_data_offered && |
| !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, |
| int is_first_run) { |
| 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, is_first_run)) { |
| 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_complete_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 = 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_encrypted_extensions: |
| ret = do_process_encrypted_extensions(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, 1 /* first run */); |
| break; |
| case state_complete_client_certificate_verify: |
| ret = do_send_client_certificate_verify(hs, 0 /* complete */); |
| 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) { |
| int ret = 0; |
| SSL_SESSION *session = SSL_SESSION_dup(ssl->s3->established_session, |
| SSL_SESSION_INCLUDE_NONAUTH); |
| if (session == NULL) { |
| return 0; |
| } |
| |
| ssl_session_rebase_time(ssl, session); |
| |
| 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); |
| goto err; |
| } |
| |
| /* 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); |
| goto err; |
| } |
| |
| 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); |
| goto err; |
| } |
| } |
| |
| session->ticket_age_add_valid = 1; |
| session->not_resumable = 0; |
| |
| if (ssl->ctx->new_session_cb != NULL && |
| ssl->ctx->new_session_cb(ssl, session)) { |
| /* |new_session_cb|'s return value signals that it took ownership. */ |
| session = NULL; |
| } |
| |
| ret = 1; |
| |
| err: |
| SSL_SESSION_free(session); |
| return ret; |
| } |
| |
| 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; |
| } |