- /* 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 <utility>
-
- #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"
-
-
- namespace bssl {
-
- enum client_hs_state_t {
- state_read_hello_retry_request = 0,
- state_send_second_client_hello,
- state_read_server_hello,
- state_read_encrypted_extensions,
- state_read_certificate_request,
- state_read_server_certificate,
- state_read_server_certificate_verify,
- state_read_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_read_hello_retry_request(SSL_HANDSHAKE *hs) {
- SSL *const ssl = hs->ssl;
- assert(ssl->s3->have_version);
- SSLMessage msg;
- if (!ssl->method->get_message(ssl, &msg)) {
- return ssl_hs_read_message;
- }
-
- // Queue up a ChangeCipherSpec for whenever we next send something. This
- // will be before the second ClientHello. If we offered early data, this was
- // already done.
- if (!hs->early_data_offered &&
- !ssl->method->add_change_cipher_spec(ssl)) {
- return ssl_hs_error;
- }
-
- if (!ssl_check_message_type(ssl, msg, SSL3_MT_SERVER_HELLO)) {
- return ssl_hs_error;
- }
-
- CBS body = msg.body, extensions, server_random, session_id;
- uint16_t server_version, cipher_suite;
- uint8_t compression_method;
- if (!CBS_get_u16(&body, &server_version) ||
- !CBS_get_bytes(&body, &server_random, SSL3_RANDOM_SIZE) ||
- !CBS_get_u8_length_prefixed(&body, &session_id) ||
- !CBS_mem_equal(&session_id, hs->session_id, hs->session_id_len) ||
- !CBS_get_u16(&body, &cipher_suite) ||
- !CBS_get_u8(&body, &compression_method) ||
- compression_method != 0 ||
- !CBS_get_u16_length_prefixed(&body, &extensions) ||
- CBS_len(&extensions) == 0 ||
- CBS_len(&body) != 0) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR);
- ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
- return ssl_hs_error;
- }
-
- if (!CBS_mem_equal(&server_random, kHelloRetryRequest, SSL3_RANDOM_SIZE)) {
- hs->tls13_state = state_read_server_hello;
- return ssl_hs_ok;
- }
-
- const SSL_CIPHER *cipher = SSL_get_cipher_by_value(cipher_suite);
- // Check if the cipher is a TLS 1.3 cipher.
- if (cipher == NULL ||
- SSL_CIPHER_get_min_version(cipher) > ssl_protocol_version(ssl) ||
- SSL_CIPHER_get_max_version(cipher) < ssl_protocol_version(ssl)) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_WRONG_CIPHER_RETURNED);
- ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER);
- return ssl_hs_error;
- }
-
- hs->new_cipher = cipher;
-
- if (!hs->transcript.InitHash(ssl_protocol_version(ssl), hs->new_cipher) ||
- !hs->transcript.UpdateForHelloRetryRequest()) {
- return ssl_hs_error;
- }
-
-
- bool have_cookie, have_key_share, have_supported_versions;
- CBS cookie, key_share, supported_versions;
- SSL_EXTENSION_TYPE ext_types[] = {
- {TLSEXT_TYPE_key_share, &have_key_share, &key_share},
- {TLSEXT_TYPE_cookie, &have_cookie, &cookie},
- {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 */)) {
- ssl_send_alert(ssl, SSL3_AL_FATAL, alert);
- return ssl_hs_error;
- }
-
- if (!have_cookie && !have_key_share) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_EMPTY_HELLO_RETRY_REQUEST);
- ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER);
- 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);
- ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
- return ssl_hs_error;
- }
-
- if (!hs->cookie.CopyFrom(cookie_value)) {
- 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);
- ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
- return ssl_hs_error;
- }
-
- // The group must be supported.
- if (!tls1_check_group_id(ssl, group_id)) {
- ssl_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 (hs->key_share->GroupID() == group_id) {
- ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER);
- OPENSSL_PUT_ERROR(SSL, SSL_R_WRONG_CURVE);
- return ssl_hs_error;
- }
-
- hs->key_share.reset();
- hs->retry_group = group_id;
- }
-
- if (!ssl_hash_message(hs, msg)) {
- return ssl_hs_error;
- }
-
- ssl->method->next_message(ssl);
- hs->received_hello_retry_request = true;
- 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;
- // Restore the null cipher. We may have switched due to 0-RTT.
- bssl::UniquePtr<SSLAEADContext> null_ctx =
- SSLAEADContext::CreateNullCipher(SSL_is_dtls(ssl));
- if (!null_ctx ||
- !ssl->method->set_write_state(ssl, std::move(null_ctx))) {
- return ssl_hs_error;
- }
-
- ssl->s3->aead_write_ctx->SetVersionIfNullCipher(ssl->version);
-
- if (!ssl_write_client_hello(hs)) {
- return ssl_hs_error;
- }
-
- hs->tls13_state = state_read_server_hello;
- return ssl_hs_flush;
- }
-
- static enum ssl_hs_wait_t do_read_server_hello(SSL_HANDSHAKE *hs) {
- SSL *const ssl = hs->ssl;
- SSLMessage msg;
- if (!ssl->method->get_message(ssl, &msg)) {
- return ssl_hs_read_message;
- }
- if (!ssl_check_message_type(ssl, msg, SSL3_MT_SERVER_HELLO)) {
- return ssl_hs_error;
- }
-
- CBS body = msg.body, server_random, session_id, extensions;
- uint16_t server_version;
- uint16_t cipher_suite;
- uint8_t compression_method;
- if (!CBS_get_u16(&body, &server_version) ||
- !CBS_get_bytes(&body, &server_random, SSL3_RANDOM_SIZE) ||
- !CBS_get_u8_length_prefixed(&body, &session_id) ||
- !CBS_mem_equal(&session_id, hs->session_id, hs->session_id_len) ||
- !CBS_get_u16(&body, &cipher_suite) ||
- !CBS_get_u8(&body, &compression_method) ||
- compression_method != 0 ||
- !CBS_get_u16_length_prefixed(&body, &extensions) ||
- CBS_len(&body) != 0) {
- ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
- OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR);
- return ssl_hs_error;
- }
-
- if (server_version != TLS1_2_VERSION) {
- ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
- OPENSSL_PUT_ERROR(SSL, SSL_R_WRONG_VERSION_NUMBER);
- return ssl_hs_error;
- }
-
- // Forbid a second HelloRetryRequest.
- if (CBS_mem_equal(&server_random, kHelloRetryRequest, SSL3_RANDOM_SIZE)) {
- ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
- OPENSSL_PUT_ERROR(SSL, SSL_R_UNEXPECTED_MESSAGE);
- return ssl_hs_error;
- }
-
- OPENSSL_memcpy(ssl->s3->server_random, CBS_data(&server_random),
- SSL3_RANDOM_SIZE);
-
- // Check if the cipher is a TLS 1.3 cipher.
- const SSL_CIPHER *cipher = SSL_get_cipher_by_value(cipher_suite);
- if (cipher == nullptr ||
- SSL_CIPHER_get_min_version(cipher) > ssl_protocol_version(ssl) ||
- SSL_CIPHER_get_max_version(cipher) < ssl_protocol_version(ssl)) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_WRONG_CIPHER_RETURNED);
- ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER);
- return ssl_hs_error;
- }
-
- // Check that the cipher matches the one in the HelloRetryRequest.
- if (hs->received_hello_retry_request &&
- hs->new_cipher != cipher) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_WRONG_CIPHER_RETURNED);
- ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER);
- return ssl_hs_error;
- }
-
- // Parse out the extensions.
- bool have_key_share = false, have_pre_shared_key = false,
- have_supported_versions = false;
- CBS key_share, pre_shared_key, supported_versions;
- 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 */)) {
- ssl_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);
- ssl_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)) {
- ssl_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);
- ssl_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);
- ssl_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);
- ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER);
- return ssl_hs_error;
- }
-
- ssl->s3->session_reused = true;
- // 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) {
- ssl_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.get(),
- ssl->session_ctx->session_psk_dhe_timeout);
- } else if (!ssl_get_new_session(hs, 0)) {
- ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
- return ssl_hs_error;
- }
-
- hs->new_session->cipher = cipher;
- hs->new_cipher = cipher;
-
- size_t hash_len =
- EVP_MD_size(ssl_get_handshake_digest(ssl_protocol_version(ssl), cipher));
-
- // Set up the key schedule and incorporate the PSK into the running secret.
- if (ssl->s3->session_reused) {
- if (!tls13_init_key_schedule(hs, hs->new_session->master_key,
- hs->new_session->master_key_length)) {
- return ssl_hs_error;
- }
- } else if (!tls13_init_key_schedule(hs, kZeroes, 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);
- ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_MISSING_EXTENSION);
- return ssl_hs_error;
- }
-
- // Resolve ECDHE and incorporate it into the secret.
- Array<uint8_t> dhe_secret;
- alert = SSL_AD_DECODE_ERROR;
- if (!ssl_ext_key_share_parse_serverhello(hs, &dhe_secret, &alert,
- &key_share)) {
- ssl_send_alert(ssl, SSL3_AL_FATAL, alert);
- return ssl_hs_error;
- }
-
- if (!tls13_advance_key_schedule(hs, dhe_secret.data(), dhe_secret.size()) ||
- !ssl_hash_message(hs, msg) ||
- !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 (!hs->early_data_offered) {
- // If not sending early data, set client traffic keys now so that alerts are
- // encrypted.
- if (!tls13_set_traffic_key(ssl, evp_aead_seal, hs->client_handshake_secret,
- hs->hash_len)) {
- return ssl_hs_error;
- }
- }
-
- ssl->method->next_message(ssl);
- hs->tls13_state = state_read_encrypted_extensions;
- return ssl_hs_ok;
- }
-
- static enum ssl_hs_wait_t do_read_encrypted_extensions(SSL_HANDSHAKE *hs) {
- SSL *const ssl = hs->ssl;
- SSLMessage msg;
- if (!ssl->method->get_message(ssl, &msg)) {
- return ssl_hs_read_message;
- }
- if (!ssl_check_message_type(ssl, msg, SSL3_MT_ENCRYPTED_EXTENSIONS)) {
- return ssl_hs_error;
- }
-
- CBS body = msg.body;
- if (!ssl_parse_serverhello_tlsext(hs, &body)) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_PARSE_TLSEXT);
- return ssl_hs_error;
- }
- if (CBS_len(&body) != 0) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR);
- ssl_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.empty()) {
- hs->new_session->early_alpn = (uint8_t *)BUF_memdup(
- ssl->s3->alpn_selected.data(), ssl->s3->alpn_selected.size());
- if (hs->new_session->early_alpn == NULL) {
- ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
- return ssl_hs_error;
- }
- hs->new_session->early_alpn_len = ssl->s3->alpn_selected.size();
- }
-
- if (ssl->s3->early_data_accepted) {
- if (hs->early_session->cipher != hs->new_session->cipher ||
- MakeConstSpan(hs->early_session->early_alpn,
- hs->early_session->early_alpn_len) !=
- ssl->s3->alpn_selected) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_ALPN_MISMATCH_ON_EARLY_DATA);
- return ssl_hs_error;
- }
- if (ssl->s3->tlsext_channel_id_valid || hs->received_custom_extension ||
- ssl->token_binding_negotiated) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_UNEXPECTED_EXTENSION_ON_EARLY_DATA);
- return ssl_hs_error;
- }
- }
-
- if (!ssl_hash_message(hs, msg)) {
- return ssl_hs_error;
- }
-
- ssl->method->next_message(ssl);
- hs->tls13_state = state_read_certificate_request;
- if (hs->in_early_data && !ssl->s3->early_data_accepted) {
- return ssl_hs_early_data_rejected;
- }
- return ssl_hs_ok;
- }
-
- static enum ssl_hs_wait_t do_read_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_read_server_finished;
- return ssl_hs_ok;
- }
-
- SSLMessage msg;
- if (!ssl->method->get_message(ssl, &msg)) {
- return ssl_hs_read_message;
- }
-
- // CertificateRequest is optional.
- if (msg.type != SSL3_MT_CERTIFICATE_REQUEST) {
- hs->tls13_state = state_read_server_certificate;
- return ssl_hs_ok;
- }
-
-
- bool have_sigalgs = false, have_ca = false;
- CBS sigalgs, ca;
- const SSL_EXTENSION_TYPE ext_types[] = {
- {TLSEXT_TYPE_signature_algorithms, &have_sigalgs, &sigalgs},
- {TLSEXT_TYPE_certificate_authorities, &have_ca, &ca},
- };
-
- CBS body = msg.body, context, extensions, supported_signature_algorithms;
- uint8_t alert = SSL_AD_DECODE_ERROR;
- if (!CBS_get_u8_length_prefixed(&body, &context) ||
- // The request context is always empty during the handshake.
- CBS_len(&context) != 0 ||
- !CBS_get_u16_length_prefixed(&body, &extensions) ||
- CBS_len(&body) != 0 ||
- !ssl_parse_extensions(&extensions, &alert, ext_types,
- OPENSSL_ARRAY_SIZE(ext_types),
- 1 /* accept unknown */) ||
- (have_ca && CBS_len(&ca) == 0) ||
- !have_sigalgs ||
- !CBS_get_u16_length_prefixed(&sigalgs,
- &supported_signature_algorithms) ||
- CBS_len(&supported_signature_algorithms) == 0 ||
- !tls1_parse_peer_sigalgs(hs, &supported_signature_algorithms)) {
- ssl_send_alert(ssl, SSL3_AL_FATAL, alert);
- OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR);
- return ssl_hs_error;
- }
-
- if (have_ca) {
- hs->ca_names = ssl_parse_client_CA_list(ssl, &alert, &ca);
- if (!hs->ca_names) {
- ssl_send_alert(ssl, SSL3_AL_FATAL, alert);
- return ssl_hs_error;
- }
- } else {
- hs->ca_names.reset(sk_CRYPTO_BUFFER_new_null());
- if (!hs->ca_names) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
- ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
- return ssl_hs_error;
- }
- }
-
- hs->cert_request = true;
- ssl->ctx->x509_method->hs_flush_cached_ca_names(hs);
-
- if (!ssl_hash_message(hs, msg)) {
- return ssl_hs_error;
- }
-
- ssl->method->next_message(ssl);
- hs->tls13_state = state_read_server_certificate;
- return ssl_hs_ok;
- }
-
- static enum ssl_hs_wait_t do_read_server_certificate(SSL_HANDSHAKE *hs) {
- SSL *const ssl = hs->ssl;
- SSLMessage msg;
- if (!ssl->method->get_message(ssl, &msg)) {
- return ssl_hs_read_message;
- }
- if (!ssl_check_message_type(ssl, msg, SSL3_MT_CERTIFICATE) ||
- !tls13_process_certificate(hs, msg, 0 /* certificate required */) ||
- !ssl_hash_message(hs, msg)) {
- return ssl_hs_error;
- }
-
- ssl->method->next_message(ssl);
- hs->tls13_state = state_read_server_certificate_verify;
- return ssl_hs_ok;
- }
-
- static enum ssl_hs_wait_t do_read_server_certificate_verify(
- SSL_HANDSHAKE *hs) {
- SSL *const ssl = hs->ssl;
- SSLMessage msg;
- if (!ssl->method->get_message(ssl, &msg)) {
- return ssl_hs_read_message;
- }
- switch (ssl_verify_peer_cert(hs)) {
- case ssl_verify_ok:
- break;
- case ssl_verify_invalid:
- return ssl_hs_error;
- case ssl_verify_retry:
- hs->tls13_state = state_read_server_certificate_verify;
- return ssl_hs_certificate_verify;
- }
-
- if (!ssl_check_message_type(ssl, msg, SSL3_MT_CERTIFICATE_VERIFY) ||
- !tls13_process_certificate_verify(hs, msg) ||
- !ssl_hash_message(hs, msg)) {
- return ssl_hs_error;
- }
-
- ssl->method->next_message(ssl);
- hs->tls13_state = state_read_server_finished;
- return ssl_hs_ok;
- }
-
- static enum ssl_hs_wait_t do_read_server_finished(SSL_HANDSHAKE *hs) {
- SSL *const ssl = hs->ssl;
- SSLMessage msg;
- if (!ssl->method->get_message(ssl, &msg)) {
- return ssl_hs_read_message;
- }
- if (!ssl_check_message_type(ssl, msg, SSL3_MT_FINISHED) ||
- !tls13_process_finished(hs, msg, 0 /* don't use saved value */) ||
- !ssl_hash_message(hs, msg) ||
- // 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->next_message(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->s3->early_data_accepted) {
- hs->can_early_write = false;
- ScopedCBB cbb;
- CBB body;
- if (!ssl->method->init_message(ssl, cbb.get(), &body,
- SSL3_MT_END_OF_EARLY_DATA) ||
- !ssl_add_message_cbb(ssl, cbb.get())) {
- return ssl_hs_error;
- }
- }
-
- if (hs->early_data_offered) {
- if (!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) {
- ssl_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;
- }
-
- ScopedCBB cbb;
- CBB body;
- if (!ssl->method->init_message(ssl, cbb.get(), &body, SSL3_MT_CHANNEL_ID) ||
- !tls1_write_channel_id(hs, &body) ||
- !ssl_add_message_cbb(ssl, cbb.get())) {
- 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<enum client_hs_state_t>(hs->tls13_state);
- switch (state) {
- case state_read_hello_retry_request:
- ret = do_read_hello_retry_request(hs);
- break;
- case state_send_second_client_hello:
- ret = do_send_second_client_hello(hs);
- break;
- case state_read_server_hello:
- ret = do_read_server_hello(hs);
- break;
- case state_read_encrypted_extensions:
- ret = do_read_encrypted_extensions(hs);
- break;
- case state_read_certificate_request:
- ret = do_read_certificate_request(hs);
- break;
- case state_read_server_certificate:
- ret = do_read_server_certificate(hs);
- break;
- case state_read_server_certificate_verify:
- ret = do_read_server_certificate_verify(hs);
- break;
- case state_read_server_finished:
- ret = do_read_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 (hs->tls13_state != state) {
- ssl_do_info_callback(hs->ssl, SSL_CB_CONNECT_LOOP, 1);
- }
-
- if (ret != ssl_hs_ok) {
- return ret;
- }
- }
-
- return ssl_hs_ok;
- }
-
- const char *tls13_client_handshake_state(SSL_HANDSHAKE *hs) {
- enum client_hs_state_t state =
- static_cast<enum client_hs_state_t>(hs->tls13_state);
- switch (state) {
- case state_read_hello_retry_request:
- return "TLS 1.3 client read_hello_retry_request";
- case state_send_second_client_hello:
- return "TLS 1.3 client send_second_client_hello";
- case state_read_server_hello:
- return "TLS 1.3 client read_server_hello";
- case state_read_encrypted_extensions:
- return "TLS 1.3 client read_encrypted_extensions";
- case state_read_certificate_request:
- return "TLS 1.3 client read_certificate_request";
- case state_read_server_certificate:
- return "TLS 1.3 client read_server_certificate";
- case state_read_server_certificate_verify:
- return "TLS 1.3 client read_server_certificate_verify";
- case state_read_server_finished:
- return "TLS 1.3 client read_server_finished";
- case state_send_end_of_early_data:
- return "TLS 1.3 client send_end_of_early_data";
- case state_send_client_certificate:
- return "TLS 1.3 client send_client_certificate";
- case state_send_client_certificate_verify:
- return "TLS 1.3 client send_client_certificate_verify";
- case state_complete_second_flight:
- return "TLS 1.3 client complete_second_flight";
- case state_done:
- return "TLS 1.3 client done";
- }
-
- return "TLS 1.3 client unknown";
- }
-
- int tls13_process_new_session_ticket(SSL *ssl, const SSLMessage &msg) {
- if (ssl->s3->write_shutdown != ssl_shutdown_none) {
- // Ignore tickets on shutdown. Callers tend to indiscriminately call
- // |SSL_shutdown| before destroying an |SSL|, at which point calling the new
- // session callback may be confusing.
- return 1;
- }
-
- UniquePtr<SSL_SESSION> session = SSL_SESSION_dup(
- ssl->s3->established_session.get(), SSL_SESSION_INCLUDE_NONAUTH);
- if (!session) {
- return 0;
- }
-
- ssl_session_rebase_time(ssl, session.get());
-
- uint32_t server_timeout;
- CBS body = msg.body, ticket_nonce, ticket, extensions;
- if (!CBS_get_u32(&body, &server_timeout) ||
- !CBS_get_u32(&body, &session->ticket_age_add) ||
- !CBS_get_u8_length_prefixed(&body, &ticket_nonce) ||
- !CBS_get_u16_length_prefixed(&body, &ticket) ||
- !CBS_stow(&ticket, &session->tlsext_tick, &session->tlsext_ticklen) ||
- !CBS_get_u16_length_prefixed(&body, &extensions) ||
- CBS_len(&body) != 0) {
- ssl_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;
- }
-
- if (!tls13_derive_session_psk(session.get(), ticket_nonce)) {
- return 0;
- }
-
- // Parse out the extensions.
- bool have_early_data_info = false;
- CBS early_data_info;
- const SSL_EXTENSION_TYPE ext_types[] = {
- {TLSEXT_TYPE_early_data, &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 */)) {
- ssl_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) {
- ssl_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->session_cache_mode & SSL_SESS_CACHE_CLIENT) &&
- 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;
- }
-
- } // namespace bssl
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