external/boringssl: Sync to aa2485.
This includes the following changes:
https://boringssl.googlesource.com/boringssl/+log/171b5403ee767fa0f3aecd377867db6533c3eb8f..aa24851515d6280aa1d6a8b1548fe74691df3136
Bug: 29744850
Change-Id: Id4e4a9e7a19c2f0badbaead2c39a51037ba182ed
diff --git a/src/ssl/tls13_server.c b/src/ssl/tls13_server.c
new file mode 100644
index 0000000..a1aeeea
--- /dev/null
+++ b/src/ssl/tls13_server.c
@@ -0,0 +1,606 @@
+/* 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);
+ }
+
+ /* TODO(davidben): Support PSK. */
+ OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
+ return 0;
+}
+
+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);
+
+ SSL_set_session(ssl, NULL);
+ if (!ssl_get_new_session(ssl, 1 /* server */)) {
+ ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
+ return ssl_hs_error;
+ }
+
+ 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) {
+ /* 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;
+ }
+
+ 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;
+
+ ssl->method->received_flight(ssl);
+
+ /* The PRF hash is now known. Set up the key schedule and hash the
+ * ClientHello. */
+ size_t hash_len =
+ EVP_MD_size(ssl_get_handshake_digest(ssl_get_algorithm_prf(ssl)));
+ if (!tls13_init_key_schedule(ssl, kZeroes, hash_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_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 sigalgs_len = tls12_get_psigalgs(ssl, &sigalgs);
+ if (!CBB_add_u16_length_prefixed(&body, &sigalgs_cbb)) {
+ goto err;
+ }
+
+ for (size_t i = 0; i < sigalgs_len; 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) {
+ /* Skip this state. */
+ hs->state = state_process_client_certificate_verify;
+ 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;
+}