- /* 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 <string.h>
-
- #include <openssl/bytestring.h>
- #include <openssl/digest.h>
- #include <openssl/err.h>
- #include <openssl/mem.h>
- #include <openssl/rand.h>
- #include <openssl/stack.h>
-
- #include "internal.h"
-
-
- enum server_hs_state_t {
- state_process_client_hello = 0,
- state_select_parameters,
- state_send_hello_retry_request,
- state_flush_hello_retry_request,
- state_process_second_client_hello,
- state_send_server_hello,
- state_send_encrypted_extensions,
- state_send_certificate_request,
- state_send_server_certificate,
- state_send_server_certificate_verify,
- state_complete_server_certificate_verify,
- state_send_server_finished,
- state_flush,
- state_process_client_certificate,
- state_process_client_certificate_verify,
- state_process_client_finished,
- state_send_new_session_ticket,
- state_flush_new_session_ticket,
- state_done,
- };
-
- static const uint8_t kZeroes[EVP_MAX_MD_SIZE] = {0};
-
- static int resolve_psk_secret(SSL *ssl) {
- SSL_HANDSHAKE *hs = ssl->s3->hs;
-
- if (ssl->s3->tmp.new_cipher->algorithm_auth != SSL_aPSK) {
- return tls13_advance_key_schedule(ssl, kZeroes, hs->hash_len);
- }
-
- uint8_t resumption_psk[EVP_MAX_MD_SIZE];
- if (!tls13_resumption_psk(ssl, resumption_psk, hs->hash_len,
- ssl->s3->new_session) ||
- !tls13_advance_key_schedule(ssl, resumption_psk, hs->hash_len)) {
- return 0;
- }
-
- return 1;
- }
-
- static int resolve_ecdhe_secret(SSL *ssl, int *out_need_retry,
- struct ssl_early_callback_ctx *early_ctx) {
- *out_need_retry = 0;
- SSL_HANDSHAKE *hs = ssl->s3->hs;
-
- if (ssl->s3->tmp.new_cipher->algorithm_mkey != SSL_kECDHE) {
- return tls13_advance_key_schedule(ssl, kZeroes, hs->hash_len);
- }
-
- CBS key_share;
- if (!ssl_early_callback_get_extension(early_ctx, &key_share,
- TLSEXT_TYPE_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;
- }
-
- int found_key_share;
- uint8_t *dhe_secret;
- size_t dhe_secret_len;
- uint8_t alert;
- if (!ssl_ext_key_share_parse_clienthello(ssl, &found_key_share, &dhe_secret,
- &dhe_secret_len, &alert,
- &key_share)) {
- ssl3_send_alert(ssl, SSL3_AL_FATAL, alert);
- return 0;
- }
-
- if (!found_key_share) {
- *out_need_retry = 1;
- return 0;
- }
-
- int ok = tls13_advance_key_schedule(ssl, dhe_secret, dhe_secret_len);
- OPENSSL_free(dhe_secret);
- return ok;
- }
-
- static enum ssl_hs_wait_t do_process_client_hello(SSL *ssl, SSL_HANDSHAKE *hs) {
- if (!tls13_check_message_type(ssl, SSL3_MT_CLIENT_HELLO)) {
- return ssl_hs_error;
- }
-
- struct ssl_early_callback_ctx client_hello;
- if (!ssl_early_callback_init(ssl, &client_hello, ssl->init_msg,
- ssl->init_num)) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_CLIENTHELLO_PARSE_FAILED);
- ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
- return ssl_hs_error;
- }
-
- assert(ssl->s3->have_version);
-
- /* Load the client random. */
- if (client_hello.random_len != SSL3_RANDOM_SIZE) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
- return -1;
- }
- memcpy(ssl->s3->client_random, client_hello.random, client_hello.random_len);
-
- uint8_t alert = SSL_AD_DECODE_ERROR;
- SSL_SESSION *session = NULL;
- CBS pre_shared_key;
- if (ssl_early_callback_get_extension(&client_hello, &pre_shared_key,
- TLSEXT_TYPE_pre_shared_key) &&
- !ssl_ext_pre_shared_key_parse_clienthello(ssl, &session, &alert,
- &pre_shared_key)) {
- ssl3_send_alert(ssl, SSL3_AL_FATAL, alert);
- return 0;
- }
-
- uint16_t resumption_cipher;
- if (session != NULL &&
- /* We currently only support ECDHE-PSK resumption. */
- ((session->ticket_flags & SSL_TICKET_ALLOW_DHE_RESUMPTION) == 0 ||
- /* Only resume if the session's version matches. */
- session->ssl_version != ssl->version ||
- !ssl_cipher_get_ecdhe_psk_cipher(session->cipher, &resumption_cipher) ||
- !ssl_client_cipher_list_contains_cipher(&client_hello,
- resumption_cipher))) {
- SSL_SESSION_free(session);
- session = NULL;
- }
-
- if (session == NULL) {
- if (!ssl_get_new_session(ssl, 1 /* server */)) {
- ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
- return ssl_hs_error;
- }
- } else {
- /* Only authentication information carries over in TLS 1.3. */
- ssl->s3->new_session = SSL_SESSION_dup(session, SSL_SESSION_DUP_AUTH_ONLY);
- if (ssl->s3->new_session == NULL) {
- ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
- return ssl_hs_error;
- }
- ssl->s3->session_reused = 1;
- SSL_SESSION_free(session);
- }
-
- if (ssl->ctx->dos_protection_cb != NULL &&
- ssl->ctx->dos_protection_cb(&client_hello) == 0) {
- /* Connection rejected for DOS reasons. */
- OPENSSL_PUT_ERROR(SSL, SSL_R_CONNECTION_REJECTED);
- ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_ACCESS_DENIED);
- return ssl_hs_error;
- }
-
- /* TLS 1.3 requires the peer only advertise the null compression. */
- if (client_hello.compression_methods_len != 1 ||
- client_hello.compression_methods[0] != 0) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_COMPRESSION_LIST);
- ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER);
- return ssl_hs_error;
- }
-
- /* TLS extensions. */
- if (!ssl_parse_clienthello_tlsext(ssl, &client_hello)) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_PARSE_TLSEXT);
- return ssl_hs_error;
- }
-
- hs->state = state_select_parameters;
- return ssl_hs_ok;
- }
-
- static enum ssl_hs_wait_t do_select_parameters(SSL *ssl, SSL_HANDSHAKE *hs) {
- if (!ssl->s3->session_reused) {
- /* Call |cert_cb| to update server certificates if required. */
- if (ssl->cert->cert_cb != NULL) {
- int rv = ssl->cert->cert_cb(ssl, ssl->cert->cert_cb_arg);
- if (rv == 0) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_CERT_CB_ERROR);
- ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
- return ssl_hs_error;
- }
- if (rv < 0) {
- hs->state = state_select_parameters;
- return ssl_hs_x509_lookup;
- }
- }
- }
-
- struct ssl_early_callback_ctx client_hello;
- if (!ssl_early_callback_init(ssl, &client_hello, ssl->init_msg,
- ssl->init_num)) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_CLIENTHELLO_PARSE_FAILED);
- ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
- return ssl_hs_error;
- }
-
- if (!ssl->s3->session_reused) {
- const SSL_CIPHER *cipher =
- ssl3_choose_cipher(ssl, &client_hello, ssl_get_cipher_preferences(ssl));
- if (cipher == NULL) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_NO_SHARED_CIPHER);
- ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
- return ssl_hs_error;
- }
-
- ssl->s3->new_session->cipher = cipher;
- ssl->s3->tmp.new_cipher = cipher;
- } else {
- uint16_t resumption_cipher;
- if (!ssl_cipher_get_ecdhe_psk_cipher(ssl->s3->new_session->cipher,
- &resumption_cipher)) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_NO_SHARED_CIPHER);
- ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
- return ssl_hs_error;
- }
- ssl->s3->tmp.new_cipher = SSL_get_cipher_by_value(resumption_cipher);
- }
-
- ssl->method->received_flight(ssl);
-
- /* The PRF hash is now known. Set up the key schedule and hash the
- * ClientHello. */
- size_t resumption_ctx_len =
- EVP_MD_size(ssl_get_handshake_digest(ssl_get_algorithm_prf(ssl)));
- if (ssl->s3->session_reused) {
- uint8_t resumption_ctx[EVP_MAX_MD_SIZE];
- if (!tls13_resumption_context(ssl, resumption_ctx, resumption_ctx_len,
- ssl->s3->new_session) ||
- !tls13_init_key_schedule(ssl, resumption_ctx, resumption_ctx_len)) {
- return ssl_hs_error;
- }
- } else {
- if (!tls13_init_key_schedule(ssl, kZeroes, resumption_ctx_len)) {
- return ssl_hs_error;
- }
- }
-
- /* Resolve PSK and incorporate it into the secret. */
- if (!resolve_psk_secret(ssl)) {
- return ssl_hs_error;
- }
-
- /* Resolve ECDHE and incorporate it into the secret. */
- int need_retry;
- if (!resolve_ecdhe_secret(ssl, &need_retry, &client_hello)) {
- if (need_retry) {
- hs->state = state_send_hello_retry_request;
- return ssl_hs_ok;
- }
- return ssl_hs_error;
- }
-
- hs->state = state_send_server_hello;
- return ssl_hs_ok;
- }
-
- static enum ssl_hs_wait_t do_send_hello_retry_request(SSL *ssl,
- SSL_HANDSHAKE *hs) {
- CBB cbb, body, extensions;
- uint16_t group_id;
- if (!ssl->method->init_message(ssl, &cbb, &body,
- SSL3_MT_HELLO_RETRY_REQUEST) ||
- !CBB_add_u16(&body, ssl->version) ||
- !CBB_add_u16(&body, ssl_cipher_get_value(ssl->s3->tmp.new_cipher)) ||
- !tls1_get_shared_group(ssl, &group_id) ||
- !CBB_add_u16(&body, group_id) ||
- !CBB_add_u16_length_prefixed(&body, &extensions) ||
- !ssl->method->finish_message(ssl, &cbb)) {
- CBB_cleanup(&cbb);
- return ssl_hs_error;
- }
-
- hs->state = state_flush_hello_retry_request;
- return ssl_hs_write_message;
- }
-
- static enum ssl_hs_wait_t do_flush_hello_retry_request(SSL *ssl,
- SSL_HANDSHAKE *hs) {
- hs->state = state_process_second_client_hello;
- return ssl_hs_flush_and_read_message;
- }
-
- static enum ssl_hs_wait_t do_process_second_client_hello(SSL *ssl,
- SSL_HANDSHAKE *hs) {
- if (!tls13_check_message_type(ssl, SSL3_MT_CLIENT_HELLO)) {
- return ssl_hs_error;
- }
-
- struct ssl_early_callback_ctx client_hello;
- if (!ssl_early_callback_init(ssl, &client_hello, ssl->init_msg,
- ssl->init_num)) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_CLIENTHELLO_PARSE_FAILED);
- ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
- return ssl_hs_error;
- }
-
- int need_retry;
- if (!resolve_ecdhe_secret(ssl, &need_retry, &client_hello)) {
- if (need_retry) {
- /* Only send one HelloRetryRequest. */
- ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER);
- OPENSSL_PUT_ERROR(SSL, SSL_R_WRONG_CURVE);
- }
- return ssl_hs_error;
- }
-
- if (!ssl->method->hash_current_message(ssl)) {
- return ssl_hs_error;
- }
-
- ssl->method->received_flight(ssl);
- hs->state = state_send_server_hello;
- return ssl_hs_ok;
- }
-
- static enum ssl_hs_wait_t do_send_server_hello(SSL *ssl, SSL_HANDSHAKE *hs) {
- CBB cbb, body, extensions;
- if (!ssl->method->init_message(ssl, &cbb, &body, SSL3_MT_SERVER_HELLO) ||
- !CBB_add_u16(&body, ssl->version) ||
- !RAND_bytes(ssl->s3->server_random, sizeof(ssl->s3->server_random)) ||
- !CBB_add_bytes(&body, ssl->s3->server_random, SSL3_RANDOM_SIZE) ||
- !CBB_add_u16(&body, ssl_cipher_get_value(ssl->s3->tmp.new_cipher)) ||
- !CBB_add_u16_length_prefixed(&body, &extensions) ||
- !ssl_ext_pre_shared_key_add_serverhello(ssl, &extensions) ||
- !ssl_ext_key_share_add_serverhello(ssl, &extensions) ||
- !ssl->method->finish_message(ssl, &cbb)) {
- CBB_cleanup(&cbb);
- return ssl_hs_error;
- }
-
- hs->state = state_send_encrypted_extensions;
- return ssl_hs_write_message;
- }
-
- static enum ssl_hs_wait_t do_send_encrypted_extensions(SSL *ssl,
- SSL_HANDSHAKE *hs) {
- if (!tls13_set_handshake_traffic(ssl)) {
- return ssl_hs_error;
- }
-
- CBB cbb, body;
- if (!ssl->method->init_message(ssl, &cbb, &body,
- SSL3_MT_ENCRYPTED_EXTENSIONS) ||
- !ssl_add_serverhello_tlsext(ssl, &body) ||
- !ssl->method->finish_message(ssl, &cbb)) {
- CBB_cleanup(&cbb);
- return ssl_hs_error;
- }
-
- hs->state = state_send_certificate_request;
- return ssl_hs_write_message;
- }
-
- static enum ssl_hs_wait_t do_send_certificate_request(SSL *ssl,
- SSL_HANDSHAKE *hs) {
- /* Determine whether to request a client certificate. */
- ssl->s3->tmp.cert_request = !!(ssl->verify_mode & SSL_VERIFY_PEER);
- /* CertificateRequest may only be sent in certificate-based ciphers. */
- if (!ssl_cipher_uses_certificate_auth(ssl->s3->tmp.new_cipher)) {
- ssl->s3->tmp.cert_request = 0;
- }
-
- if (!ssl->s3->tmp.cert_request) {
- /* Skip this state. */
- hs->state = state_send_server_certificate;
- return ssl_hs_ok;
- }
-
- CBB cbb, body, sigalgs_cbb;
- if (!ssl->method->init_message(ssl, &cbb, &body,
- SSL3_MT_CERTIFICATE_REQUEST) ||
- !CBB_add_u8(&body, 0 /* no certificate_request_context. */)) {
- goto err;
- }
-
- const uint16_t *sigalgs;
- size_t num_sigalgs = tls12_get_psigalgs(ssl, &sigalgs);
- if (!CBB_add_u16_length_prefixed(&body, &sigalgs_cbb)) {
- goto err;
- }
-
- for (size_t i = 0; i < num_sigalgs; i++) {
- if (!CBB_add_u16(&sigalgs_cbb, sigalgs[i])) {
- goto err;
- }
- }
-
- if (!ssl_add_client_CA_list(ssl, &body) ||
- !CBB_add_u16(&body, 0 /* empty certificate_extensions. */) ||
- !ssl->method->finish_message(ssl, &cbb)) {
- goto err;
- }
-
- hs->state = state_send_server_certificate;
- return ssl_hs_write_message;
-
- err:
- CBB_cleanup(&cbb);
- return ssl_hs_error;
- }
-
- static enum ssl_hs_wait_t do_send_server_certificate(SSL *ssl,
- SSL_HANDSHAKE *hs) {
- if (!ssl_cipher_uses_certificate_auth(ssl->s3->tmp.new_cipher)) {
- hs->state = state_send_server_finished;
- return ssl_hs_ok;
- }
-
- if (!ssl_has_certificate(ssl)) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_NO_CERTIFICATE_SET);
- return ssl_hs_error;
- }
-
- if (!tls13_prepare_certificate(ssl)) {
- return ssl_hs_error;
- }
-
- hs->state = state_send_server_certificate_verify;
- return ssl_hs_write_message;
- }
-
- static enum ssl_hs_wait_t do_send_server_certificate_verify(SSL *ssl,
- SSL_HANDSHAKE *hs,
- int is_first_run) {
- switch (tls13_prepare_certificate_verify(ssl, is_first_run)) {
- case ssl_private_key_success:
- hs->state = state_send_server_finished;
- return ssl_hs_write_message;
-
- case ssl_private_key_retry:
- hs->state = state_complete_server_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_send_server_finished(SSL *ssl, SSL_HANDSHAKE *hs) {
- if (!tls13_prepare_finished(ssl)) {
- return ssl_hs_error;
- }
-
- hs->state = state_flush;
- return ssl_hs_write_message;
- }
-
- static enum ssl_hs_wait_t do_flush(SSL *ssl, SSL_HANDSHAKE *hs) {
- /* Update the secret to the master secret and derive traffic keys. */
- if (!tls13_advance_key_schedule(ssl, kZeroes, hs->hash_len) ||
- !tls13_derive_traffic_secret_0(ssl) ||
- !tls13_set_traffic_key(ssl, type_data, evp_aead_seal,
- hs->traffic_secret_0, hs->hash_len)) {
- return ssl_hs_error;
- }
-
- hs->state = state_process_client_certificate;
- return ssl_hs_flush_and_read_message;
- }
-
- static enum ssl_hs_wait_t do_process_client_certificate(SSL *ssl,
- SSL_HANDSHAKE *hs) {
- if (!ssl->s3->tmp.cert_request) {
- /* OpenSSL returns X509_V_OK when no certificates are requested. This is
- * classed by them as a bug, but it's assumed by at least NGINX. */
- ssl->s3->new_session->verify_result = X509_V_OK;
-
- /* Skip this state. */
- hs->state = state_process_client_finished;
- return ssl_hs_ok;
- }
-
- const int allow_anonymous =
- (ssl->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT) == 0;
-
- if (!tls13_check_message_type(ssl, SSL3_MT_CERTIFICATE) ||
- !tls13_process_certificate(ssl, allow_anonymous) ||
- !ssl->method->hash_current_message(ssl)) {
- return ssl_hs_error;
- }
-
- /* For historical reasons, the server's copy of the chain does not include the
- * leaf while the client's does. */
- if (sk_X509_num(ssl->s3->new_session->cert_chain) > 0) {
- X509_free(sk_X509_shift(ssl->s3->new_session->cert_chain));
- }
-
- hs->state = state_process_client_certificate_verify;
- return ssl_hs_read_message;
- }
-
- static enum ssl_hs_wait_t do_process_client_certificate_verify(
- SSL *ssl, SSL_HANDSHAKE *hs) {
- if (ssl->s3->new_session->peer == NULL) {
- /* Skip this state. */
- hs->state = state_process_client_finished;
- return ssl_hs_ok;
- }
-
- if (!tls13_check_message_type(ssl, SSL3_MT_CERTIFICATE_VERIFY) ||
- !tls13_process_certificate_verify(ssl) ||
- !ssl->method->hash_current_message(ssl)) {
- return 0;
- }
-
- hs->state = state_process_client_finished;
- return ssl_hs_read_message;
- }
-
- static enum ssl_hs_wait_t do_process_client_finished(SSL *ssl,
- SSL_HANDSHAKE *hs) {
- if (!tls13_check_message_type(ssl, SSL3_MT_FINISHED) ||
- !tls13_process_finished(ssl) ||
- !ssl->method->hash_current_message(ssl) ||
- /* evp_aead_seal keys have already been switched. */
- !tls13_set_traffic_key(ssl, type_data, evp_aead_open,
- hs->traffic_secret_0, hs->hash_len) ||
- !tls13_finalize_keys(ssl)) {
- return ssl_hs_error;
- }
-
- ssl->method->received_flight(ssl);
- hs->state = state_send_new_session_ticket;
- return ssl_hs_ok;
- }
-
- static enum ssl_hs_wait_t do_send_new_session_ticket(SSL *ssl,
- SSL_HANDSHAKE *hs) {
- SSL_SESSION *session = ssl->s3->new_session;
- session->tlsext_tick_lifetime_hint = session->timeout;
- session->ticket_flags = SSL_TICKET_ALLOW_DHE_RESUMPTION;
- if (!RAND_bytes((uint8_t *)&session->ticket_age_add,
- sizeof(session->ticket_age_add))) {
- return 0;
- }
- session->ticket_age_add_valid = 1;
-
- CBB cbb, body, ticket;
- if (!ssl->method->init_message(ssl, &cbb, &body,
- SSL3_MT_NEW_SESSION_TICKET) ||
- !CBB_add_u32(&body, session->tlsext_tick_lifetime_hint) ||
- !CBB_add_u32(&body, session->ticket_flags) ||
- !CBB_add_u32(&body, session->ticket_age_add) ||
- !CBB_add_u16(&body, 0 /* no ticket extensions */) ||
- !CBB_add_u16_length_prefixed(&body, &ticket) ||
- !ssl_encrypt_ticket(ssl, &ticket, session) ||
- !ssl->method->finish_message(ssl, &cbb)) {
- CBB_cleanup(&cbb);
- return ssl_hs_error;
- }
-
- hs->session_tickets_sent++;
-
- hs->state = state_flush_new_session_ticket;
- return ssl_hs_write_message;
- }
-
- /* TLS 1.3 recommends single-use tickets, so issue multiple tickets in case the
- * client makes several connections before getting a renewal. */
- static const int kNumTickets = 2;
-
- static enum ssl_hs_wait_t do_flush_new_session_ticket(SSL *ssl,
- SSL_HANDSHAKE *hs) {
- if (hs->session_tickets_sent >= kNumTickets) {
- hs->state = state_done;
- } else {
- hs->state = state_send_new_session_ticket;
- }
- return ssl_hs_flush;
- }
-
- enum ssl_hs_wait_t tls13_server_handshake(SSL *ssl) {
- SSL_HANDSHAKE *hs = ssl->s3->hs;
-
- while (hs->state != state_done) {
- enum ssl_hs_wait_t ret = ssl_hs_error;
- enum server_hs_state_t state = hs->state;
- switch (state) {
- case state_process_client_hello:
- ret = do_process_client_hello(ssl, hs);
- break;
- case state_select_parameters:
- ret = do_select_parameters(ssl, hs);
- break;
- case state_send_hello_retry_request:
- ret = do_send_hello_retry_request(ssl, hs);
- break;
- case state_flush_hello_retry_request:
- ret = do_flush_hello_retry_request(ssl, hs);
- break;
- case state_process_second_client_hello:
- ret = do_process_second_client_hello(ssl, hs);
- break;
- case state_send_server_hello:
- ret = do_send_server_hello(ssl, hs);
- break;
- case state_send_encrypted_extensions:
- ret = do_send_encrypted_extensions(ssl, hs);
- break;
- case state_send_certificate_request:
- ret = do_send_certificate_request(ssl, hs);
- break;
- case state_send_server_certificate:
- ret = do_send_server_certificate(ssl, hs);
- break;
- case state_send_server_certificate_verify:
- ret = do_send_server_certificate_verify(ssl, hs, 1 /* first run */);
- break;
- case state_complete_server_certificate_verify:
- ret = do_send_server_certificate_verify(ssl, hs, 0 /* complete */);
- break;
- case state_send_server_finished:
- ret = do_send_server_finished(ssl, hs);
- break;
- case state_flush:
- ret = do_flush(ssl, hs);
- break;
- case state_process_client_certificate:
- ret = do_process_client_certificate(ssl, hs);
- break;
- case state_process_client_certificate_verify:
- ret = do_process_client_certificate_verify(ssl, hs);
- break;
- case state_process_client_finished:
- ret = do_process_client_finished(ssl, hs);
- break;
- case state_send_new_session_ticket:
- ret = do_send_new_session_ticket(ssl, hs);
- break;
- case state_flush_new_session_ticket:
- ret = do_flush_new_session_ticket(ssl, hs);
- break;
- case state_done:
- ret = ssl_hs_ok;
- break;
- }
-
- if (ret != ssl_hs_ok) {
- return ret;
- }
- }
-
- return ssl_hs_ok;
- }
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