| /* 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 = SSL_AD_DECODE_ERROR; |
| 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_INTERNAL_ERROR); |
| 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; |
| } |
