Switch tls13_client and tls13_server to C++.
And, with that, stage one is complete. ssl/internal.h may include C++.
Bug: 132
Change-Id: I0cb89f0ed5f4be36632a50744a80321595dc921c
Reviewed-on: https://boringssl-review.googlesource.com/17768
Reviewed-by: Steven Valdez <svaldez@google.com>
diff --git a/ssl/tls13_client.cc b/ssl/tls13_client.cc
new file mode 100644
index 0000000..7f961bf
--- /dev/null
+++ b/ssl/tls13_client.cc
@@ -0,0 +1,778 @@
+/* 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_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<enum client_hs_state_t>(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<SSL_SESSION> 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;
+}
