--- /dev/null
+/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
+ * All rights reserved.
+ *
+ * This package is an SSL implementation written
+ * by Eric Young (eay@cryptsoft.com).
+ * The implementation was written so as to conform with Netscapes SSL.
+ *
+ * This library is free for commercial and non-commercial use as long as
+ * the following conditions are aheared to. The following conditions
+ * apply to all code found in this distribution, be it the RC4, RSA,
+ * lhash, DES, etc., code; not just the SSL code. The SSL documentation
+ * included with this distribution is covered by the same copyright terms
+ * except that the holder is Tim Hudson (tjh@cryptsoft.com).
+ *
+ * Copyright remains Eric Young's, and as such any Copyright notices in
+ * the code are not to be removed.
+ * If this package is used in a product, Eric Young should be given attribution
+ * as the author of the parts of the library used.
+ * This can be in the form of a textual message at program startup or
+ * in documentation (online or textual) provided with the package.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * "This product includes cryptographic software written by
+ * Eric Young (eay@cryptsoft.com)"
+ * The word 'cryptographic' can be left out if the rouines from the library
+ * being used are not cryptographic related :-).
+ * 4. If you include any Windows specific code (or a derivative thereof) from
+ * the apps directory (application code) you must include an acknowledgement:
+ * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * The licence and distribution terms for any publically available version or
+ * derivative of this code cannot be changed. i.e. this code cannot simply be
+ * copied and put under another distribution licence
+ * [including the GNU Public Licence.]
+ */
+/* ====================================================================
+ * Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ *
+ * 3. All advertising materials mentioning features or use of this
+ * software must display the following acknowledgment:
+ * "This product includes software developed by the OpenSSL Project
+ * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
+ *
+ * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+ * endorse or promote products derived from this software without
+ * prior written permission. For written permission, please contact
+ * openssl-core@openssl.org.
+ *
+ * 5. Products derived from this software may not be called "OpenSSL"
+ * nor may "OpenSSL" appear in their names without prior written
+ * permission of the OpenSSL Project.
+ *
+ * 6. Redistributions of any form whatsoever must retain the following
+ * acknowledgment:
+ * "This product includes software developed by the OpenSSL Project
+ * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
+ * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ * ====================================================================
+ *
+ * This product includes cryptographic software written by Eric Young
+ * (eay@cryptsoft.com). This product includes software written by Tim
+ * Hudson (tjh@cryptsoft.com).
+ *
+ */
+/* ====================================================================
+ * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
+ *
+ * Portions of the attached software ("Contribution") are developed by
+ * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
+ *
+ * The Contribution is licensed pursuant to the OpenSSL open source
+ * license provided above.
+ *
+ * ECC cipher suite support in OpenSSL originally written by
+ * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
+ *
+ */
+/* ====================================================================
+ * Copyright 2005 Nokia. All rights reserved.
+ *
+ * The portions of the attached software ("Contribution") is developed by
+ * Nokia Corporation and is licensed pursuant to the OpenSSL open source
+ * license.
+ *
+ * The Contribution, originally written by Mika Kousa and Pasi Eronen of
+ * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
+ * support (see RFC 4279) to OpenSSL.
+ *
+ * No patent licenses or other rights except those expressly stated in
+ * the OpenSSL open source license shall be deemed granted or received
+ * expressly, by implication, estoppel, or otherwise.
+ *
+ * No assurances are provided by Nokia that the Contribution does not
+ * infringe the patent or other intellectual property rights of any third
+ * party or that the license provides you with all the necessary rights
+ * to make use of the Contribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
+ * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
+ * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
+ * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
+ * OTHERWISE. */
+
+#include <openssl/ssl.h>
+
+#include <assert.h>
+#include <string.h>
+
+#include <openssl/bn.h>
+#include <openssl/buf.h>
+#include <openssl/bytestring.h>
+#include <openssl/cipher.h>
+#include <openssl/ec.h>
+#include <openssl/ecdsa.h>
+#include <openssl/err.h>
+#include <openssl/evp.h>
+#include <openssl/hmac.h>
+#include <openssl/md5.h>
+#include <openssl/mem.h>
+#include <openssl/nid.h>
+#include <openssl/rand.h>
+#include <openssl/x509.h>
+
+#include "internal.h"
+#include "../crypto/internal.h"
+
+
+namespace bssl {
+
+enum ssl_server_hs_state_t {
+ state_start_accept = 0,
+ state_read_client_hello,
+ state_select_certificate,
+ state_tls13,
+ state_select_parameters,
+ state_send_server_hello,
+ state_send_server_certificate,
+ state_send_server_key_exchange,
+ state_send_server_hello_done,
+ state_read_client_certificate,
+ state_verify_client_certificate,
+ state_read_client_key_exchange,
+ state_read_client_certificate_verify,
+ state_read_change_cipher_spec,
+ state_process_change_cipher_spec,
+ state_read_next_proto,
+ state_read_channel_id,
+ state_read_client_finished,
+ state_send_server_finished,
+ state_finish_server_handshake,
+ state_done,
+};
+
+int ssl_client_cipher_list_contains_cipher(const SSL_CLIENT_HELLO *client_hello,
+ uint16_t id) {
+ CBS cipher_suites;
+ CBS_init(&cipher_suites, client_hello->cipher_suites,
+ client_hello->cipher_suites_len);
+
+ while (CBS_len(&cipher_suites) > 0) {
+ uint16_t got_id;
+ if (!CBS_get_u16(&cipher_suites, &got_id)) {
+ return 0;
+ }
+
+ if (got_id == id) {
+ return 1;
+ }
+ }
+
+ return 0;
+}
+
+static int negotiate_version(SSL_HANDSHAKE *hs, uint8_t *out_alert,
+ const SSL_CLIENT_HELLO *client_hello) {
+ SSL *const ssl = hs->ssl;
+ assert(!ssl->s3->have_version);
+ CBS supported_versions, versions;
+ if (ssl_client_hello_get_extension(client_hello, &supported_versions,
+ TLSEXT_TYPE_supported_versions)) {
+ if (!CBS_get_u8_length_prefixed(&supported_versions, &versions) ||
+ CBS_len(&supported_versions) != 0 ||
+ CBS_len(&versions) == 0) {
+ OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR);
+ *out_alert = SSL_AD_DECODE_ERROR;
+ return 0;
+ }
+ } else {
+ // Convert the ClientHello version to an equivalent supported_versions
+ // extension.
+ static const uint8_t kTLSVersions[] = {
+ 0x03, 0x03, // TLS 1.2
+ 0x03, 0x02, // TLS 1.1
+ 0x03, 0x01, // TLS 1
+ 0x03, 0x00, // SSL 3
+ };
+
+ static const uint8_t kDTLSVersions[] = {
+ 0xfe, 0xfd, // DTLS 1.2
+ 0xfe, 0xff, // DTLS 1.0
+ };
+
+ size_t versions_len = 0;
+ if (SSL_is_dtls(ssl)) {
+ if (client_hello->version <= DTLS1_2_VERSION) {
+ versions_len = 4;
+ } else if (client_hello->version <= DTLS1_VERSION) {
+ versions_len = 2;
+ }
+ CBS_init(&versions, kDTLSVersions + sizeof(kDTLSVersions) - versions_len,
+ versions_len);
+ } else {
+ if (client_hello->version >= TLS1_2_VERSION) {
+ versions_len = 8;
+ } else if (client_hello->version >= TLS1_1_VERSION) {
+ versions_len = 6;
+ } else if (client_hello->version >= TLS1_VERSION) {
+ versions_len = 4;
+ } else if (client_hello->version >= SSL3_VERSION) {
+ versions_len = 2;
+ }
+ CBS_init(&versions, kTLSVersions + sizeof(kTLSVersions) - versions_len,
+ versions_len);
+ }
+ }
+
+ if (!ssl_negotiate_version(hs, out_alert, &ssl->version, &versions)) {
+ return 0;
+ }
+
+ // At this point, the connection's version is known and |ssl->version| is
+ // fixed. Begin enforcing the record-layer version.
+ ssl->s3->have_version = true;
+ ssl->s3->aead_write_ctx->SetVersionIfNullCipher(ssl->version);
+
+ // Handle FALLBACK_SCSV.
+ if (ssl_client_cipher_list_contains_cipher(client_hello,
+ SSL3_CK_FALLBACK_SCSV & 0xffff) &&
+ ssl_protocol_version(ssl) < hs->max_version) {
+ OPENSSL_PUT_ERROR(SSL, SSL_R_INAPPROPRIATE_FALLBACK);
+ *out_alert = SSL3_AD_INAPPROPRIATE_FALLBACK;
+ return 0;
+ }
+
+ return 1;
+}
+
+static UniquePtr<STACK_OF(SSL_CIPHER)> ssl_parse_client_cipher_list(
+ const SSL_CLIENT_HELLO *client_hello) {
+ CBS cipher_suites;
+ CBS_init(&cipher_suites, client_hello->cipher_suites,
+ client_hello->cipher_suites_len);
+
+ UniquePtr<STACK_OF(SSL_CIPHER)> sk(sk_SSL_CIPHER_new_null());
+ if (!sk) {
+ OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
+ return nullptr;
+ }
+
+ while (CBS_len(&cipher_suites) > 0) {
+ uint16_t cipher_suite;
+
+ if (!CBS_get_u16(&cipher_suites, &cipher_suite)) {
+ OPENSSL_PUT_ERROR(SSL, SSL_R_ERROR_IN_RECEIVED_CIPHER_LIST);
+ return nullptr;
+ }
+
+ const SSL_CIPHER *c = SSL_get_cipher_by_value(cipher_suite);
+ if (c != NULL && !sk_SSL_CIPHER_push(sk.get(), c)) {
+ OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
+ return nullptr;
+ }
+ }
+
+ return sk;
+}
+
+// ssl_get_compatible_server_ciphers determines the key exchange and
+// authentication cipher suite masks compatible with the server configuration
+// and current ClientHello parameters of |hs|. It sets |*out_mask_k| to the key
+// exchange mask and |*out_mask_a| to the authentication mask.
+static void ssl_get_compatible_server_ciphers(SSL_HANDSHAKE *hs,
+ uint32_t *out_mask_k,
+ uint32_t *out_mask_a) {
+ SSL *const ssl = hs->ssl;
+ uint32_t mask_k = 0;
+ uint32_t mask_a = 0;
+
+ if (ssl_has_certificate(ssl)) {
+ mask_a |= ssl_cipher_auth_mask_for_key(hs->local_pubkey.get());
+ if (EVP_PKEY_id(hs->local_pubkey.get()) == EVP_PKEY_RSA) {
+ mask_k |= SSL_kRSA;
+ }
+ }
+
+ // Check for a shared group to consider ECDHE ciphers.
+ uint16_t unused;
+ if (tls1_get_shared_group(hs, &unused)) {
+ mask_k |= SSL_kECDHE;
+ }
+
+ // PSK requires a server callback.
+ if (ssl->psk_server_callback != NULL) {
+ mask_k |= SSL_kPSK;
+ mask_a |= SSL_aPSK;
+ }
+
+ *out_mask_k = mask_k;
+ *out_mask_a = mask_a;
+}
+
+static const SSL_CIPHER *ssl3_choose_cipher(
+ SSL_HANDSHAKE *hs, const SSL_CLIENT_HELLO *client_hello,
+ const struct ssl_cipher_preference_list_st *server_pref) {
+ SSL *const ssl = hs->ssl;
+ STACK_OF(SSL_CIPHER) *prio, *allow;
+ // in_group_flags will either be NULL, or will point to an array of bytes
+ // which indicate equal-preference groups in the |prio| stack. See the
+ // comment about |in_group_flags| in the |ssl_cipher_preference_list_st|
+ // struct.
+ const uint8_t *in_group_flags;
+ // group_min contains the minimal index so far found in a group, or -1 if no
+ // such value exists yet.
+ int group_min = -1;
+
+ UniquePtr<STACK_OF(SSL_CIPHER)> client_pref =
+ ssl_parse_client_cipher_list(client_hello);
+ if (!client_pref) {
+ return nullptr;
+ }
+
+ if (ssl->options & SSL_OP_CIPHER_SERVER_PREFERENCE) {
+ prio = server_pref->ciphers;
+ in_group_flags = server_pref->in_group_flags;
+ allow = client_pref.get();
+ } else {
+ prio = client_pref.get();
+ in_group_flags = NULL;
+ allow = server_pref->ciphers;
+ }
+
+ uint32_t mask_k, mask_a;
+ ssl_get_compatible_server_ciphers(hs, &mask_k, &mask_a);
+
+ for (size_t i = 0; i < sk_SSL_CIPHER_num(prio); i++) {
+ const SSL_CIPHER *c = sk_SSL_CIPHER_value(prio, i);
+
+ size_t cipher_index;
+ if (// Check if the cipher is supported for the current version.
+ SSL_CIPHER_get_min_version(c) <= ssl_protocol_version(ssl) &&
+ ssl_protocol_version(ssl) <= SSL_CIPHER_get_max_version(c) &&
+ // Check the cipher is supported for the server configuration.
+ (c->algorithm_mkey & mask_k) &&
+ (c->algorithm_auth & mask_a) &&
+ // Check the cipher is in the |allow| list.
+ sk_SSL_CIPHER_find(allow, &cipher_index, c)) {
+ if (in_group_flags != NULL && in_group_flags[i] == 1) {
+ // This element of |prio| is in a group. Update the minimum index found
+ // so far and continue looking.
+ if (group_min == -1 || (size_t)group_min > cipher_index) {
+ group_min = cipher_index;
+ }
+ } else {
+ if (group_min != -1 && (size_t)group_min < cipher_index) {
+ cipher_index = group_min;
+ }
+ return sk_SSL_CIPHER_value(allow, cipher_index);
+ }
+ }
+
+ if (in_group_flags != NULL && in_group_flags[i] == 0 && group_min != -1) {
+ // We are about to leave a group, but we found a match in it, so that's
+ // our answer.
+ return sk_SSL_CIPHER_value(allow, group_min);
+ }
+ }
+
+ return nullptr;
+}
+
+static enum ssl_hs_wait_t do_start_accept(SSL_HANDSHAKE *hs) {
+ ssl_do_info_callback(hs->ssl, SSL_CB_HANDSHAKE_START, 1);
+ hs->state = state_read_client_hello;
+ return ssl_hs_ok;
+}
+
+static enum ssl_hs_wait_t do_read_client_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_CLIENT_HELLO)) {
+ return ssl_hs_error;
+ }
+
+ if (ssl->handoff) {
+ return ssl_hs_handoff;
+ }
+
+ SSL_CLIENT_HELLO client_hello;
+ if (!ssl_client_hello_init(ssl, &client_hello, msg)) {
+ OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR);
+ ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
+ return ssl_hs_error;
+ }
+
+ // Run the early callback.
+ if (ssl->ctx->select_certificate_cb != NULL) {
+ switch (ssl->ctx->select_certificate_cb(&client_hello)) {
+ case ssl_select_cert_retry:
+ return ssl_hs_certificate_selection_pending;
+
+ case ssl_select_cert_error:
+ // Connection rejected.
+ OPENSSL_PUT_ERROR(SSL, SSL_R_CONNECTION_REJECTED);
+ ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
+ return ssl_hs_error;
+
+ default:
+ /* fallthrough */;
+ }
+ }
+
+ // Freeze the version range after the early callback.
+ if (!ssl_get_version_range(ssl, &hs->min_version, &hs->max_version)) {
+ return ssl_hs_error;
+ }
+
+ uint8_t alert = SSL_AD_DECODE_ERROR;
+ if (!negotiate_version(hs, &alert, &client_hello)) {
+ ssl_send_alert(ssl, SSL3_AL_FATAL, alert);
+ return ssl_hs_error;
+ }
+
+ hs->client_version = client_hello.version;
+ if (client_hello.random_len != SSL3_RANDOM_SIZE) {
+ OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
+ return ssl_hs_error;
+ }
+ OPENSSL_memcpy(ssl->s3->client_random, client_hello.random,
+ client_hello.random_len);
+
+ // Only null compression is supported. TLS 1.3 further requires the peer
+ // advertise no other compression.
+ if (OPENSSL_memchr(client_hello.compression_methods, 0,
+ client_hello.compression_methods_len) == NULL ||
+ (ssl_protocol_version(ssl) >= TLS1_3_VERSION &&
+ client_hello.compression_methods_len != 1)) {
+ OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_COMPRESSION_LIST);
+ ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER);
+ return ssl_hs_error;
+ }
+
+ // TLS extensions.
+ if (!ssl_parse_clienthello_tlsext(hs, &client_hello)) {
+ OPENSSL_PUT_ERROR(SSL, SSL_R_PARSE_TLSEXT);
+ return ssl_hs_error;
+ }
+
+ hs->state = state_select_certificate;
+ return ssl_hs_ok;
+}
+
+static enum ssl_hs_wait_t do_select_certificate(SSL_HANDSHAKE *hs) {
+ SSL *const ssl = hs->ssl;
+
+ SSLMessage msg;
+ if (!ssl->method->get_message(ssl, &msg)) {
+ return ssl_hs_read_message;
+ }
+
+ // 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);
+ ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
+ return ssl_hs_error;
+ }
+ if (rv < 0) {
+ return ssl_hs_x509_lookup;
+ }
+ }
+
+ if (!ssl_on_certificate_selected(hs)) {
+ return ssl_hs_error;
+ }
+
+ if (ssl_protocol_version(ssl) >= TLS1_3_VERSION) {
+ // Jump to the TLS 1.3 state machine.
+ hs->state = state_tls13;
+ return ssl_hs_ok;
+ }
+
+ SSL_CLIENT_HELLO client_hello;
+ if (!ssl_client_hello_init(ssl, &client_hello, msg)) {
+ return ssl_hs_error;
+ }
+
+ // Negotiate the cipher suite. This must be done after |cert_cb| so the
+ // certificate is finalized.
+ hs->new_cipher =
+ ssl3_choose_cipher(hs, &client_hello, ssl_get_cipher_preferences(ssl));
+ if (hs->new_cipher == NULL) {
+ OPENSSL_PUT_ERROR(SSL, SSL_R_NO_SHARED_CIPHER);
+ ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
+ return ssl_hs_error;
+ }
+
+ hs->state = state_select_parameters;
+ return ssl_hs_ok;
+}
+
+static enum ssl_hs_wait_t do_tls13(SSL_HANDSHAKE *hs) {
+ enum ssl_hs_wait_t wait = tls13_server_handshake(hs);
+ if (wait == ssl_hs_ok) {
+ hs->state = state_finish_server_handshake;
+ return ssl_hs_ok;
+ }
+
+ return wait;
+}
+
+static enum ssl_hs_wait_t do_select_parameters(SSL_HANDSHAKE *hs) {
+ SSL *const ssl = hs->ssl;
+
+ SSLMessage msg;
+ if (!ssl->method->get_message(ssl, &msg)) {
+ return ssl_hs_read_message;
+ }
+
+ SSL_CLIENT_HELLO client_hello;
+ if (!ssl_client_hello_init(ssl, &client_hello, msg)) {
+ return ssl_hs_error;
+ }
+
+ // Determine whether we are doing session resumption.
+ UniquePtr<SSL_SESSION> session;
+ bool tickets_supported = false, renew_ticket = false;
+ enum ssl_hs_wait_t wait = ssl_get_prev_session(
+ ssl, &session, &tickets_supported, &renew_ticket, &client_hello);
+ if (wait != ssl_hs_ok) {
+ return wait;
+ }
+
+ if (session) {
+ if (session->extended_master_secret && !hs->extended_master_secret) {
+ // A ClientHello without EMS that attempts to resume a session with EMS
+ // is fatal to the connection.
+ OPENSSL_PUT_ERROR(SSL, SSL_R_RESUMED_EMS_SESSION_WITHOUT_EMS_EXTENSION);
+ ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
+ return ssl_hs_error;
+ }
+
+ if (!ssl_session_is_resumable(hs, session.get()) ||
+ // If the client offers the EMS extension, but the previous session
+ // didn't use it, then negotiate a new session.
+ hs->extended_master_secret != session->extended_master_secret) {
+ session.reset();
+ }
+ }
+
+ if (session) {
+ // Use the old session.
+ hs->ticket_expected = renew_ticket;
+ ssl->session = session.release();
+ ssl->s3->session_reused = true;
+ } else {
+ hs->ticket_expected = tickets_supported;
+ ssl_set_session(ssl, NULL);
+ if (!ssl_get_new_session(hs, 1 /* server */)) {
+ return ssl_hs_error;
+ }
+
+ // Clear the session ID if we want the session to be single-use.
+ if (!(ssl->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)) {
+ hs->new_session->session_id_length = 0;
+ }
+ }
+
+ 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);
+ ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
+ return ssl_hs_error;
+ }
+
+ if (ssl->session == NULL) {
+ hs->new_session->cipher = hs->new_cipher;
+
+ // Determine whether to request a client certificate.
+ hs->cert_request = !!(ssl->verify_mode & SSL_VERIFY_PEER);
+ // Only request a certificate if Channel ID isn't negotiated.
+ if ((ssl->verify_mode & SSL_VERIFY_PEER_IF_NO_OBC) &&
+ ssl->s3->tlsext_channel_id_valid) {
+ hs->cert_request = false;
+ }
+ // CertificateRequest may only be sent in certificate-based ciphers.
+ if (!ssl_cipher_uses_certificate_auth(hs->new_cipher)) {
+ hs->cert_request = false;
+ }
+
+ if (!hs->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.
+ hs->new_session->verify_result = X509_V_OK;
+ }
+ }
+
+ // HTTP/2 negotiation depends on the cipher suite, so ALPN negotiation was
+ // deferred. Complete it now.
+ uint8_t alert = SSL_AD_DECODE_ERROR;
+ if (!ssl_negotiate_alpn(hs, &alert, &client_hello)) {
+ ssl_send_alert(ssl, SSL3_AL_FATAL, alert);
+ return ssl_hs_error;
+ }
+
+ // Now that all parameters are known, initialize the handshake hash and hash
+ // the ClientHello.
+ if (!hs->transcript.InitHash(ssl_protocol_version(ssl), hs->new_cipher) ||
+ !ssl_hash_message(hs, msg)) {
+ ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
+ return ssl_hs_error;
+ }
+
+ // Release the handshake buffer if client authentication isn't required.
+ if (!hs->cert_request) {
+ hs->transcript.FreeBuffer();
+ }
+
+ ssl->method->next_message(ssl);
+
+ hs->state = state_send_server_hello;
+ return ssl_hs_ok;
+}
+
+static enum ssl_hs_wait_t do_send_server_hello(SSL_HANDSHAKE *hs) {
+ SSL *const ssl = hs->ssl;
+
+ // We only accept ChannelIDs on connections with ECDHE in order to avoid a
+ // known attack while we fix ChannelID itself.
+ if (ssl->s3->tlsext_channel_id_valid &&
+ (hs->new_cipher->algorithm_mkey & SSL_kECDHE) == 0) {
+ ssl->s3->tlsext_channel_id_valid = false;
+ }
+
+ // If this is a resumption and the original handshake didn't support
+ // ChannelID then we didn't record the original handshake hashes in the
+ // session and so cannot resume with ChannelIDs.
+ if (ssl->session != NULL &&
+ ssl->session->original_handshake_hash_len == 0) {
+ ssl->s3->tlsext_channel_id_valid = false;
+ }
+
+ struct OPENSSL_timeval now;
+ ssl_get_current_time(ssl, &now);
+ ssl->s3->server_random[0] = now.tv_sec >> 24;
+ ssl->s3->server_random[1] = now.tv_sec >> 16;
+ ssl->s3->server_random[2] = now.tv_sec >> 8;
+ ssl->s3->server_random[3] = now.tv_sec;
+ if (!RAND_bytes(ssl->s3->server_random + 4, SSL3_RANDOM_SIZE - 4)) {
+ return ssl_hs_error;
+ }
+
+ // Implement the TLS 1.3 anti-downgrade feature, but with a different value.
+ //
+ // For draft TLS 1.3 versions, it is not safe to deploy this feature. However,
+ // some TLS terminators are non-compliant and copy the origin server's value,
+ // so we wish to measure eventual compatibility impact.
+ if (hs->max_version >= TLS1_3_VERSION) {
+ OPENSSL_memcpy(ssl->s3->server_random + SSL3_RANDOM_SIZE -
+ sizeof(kDraftDowngradeRandom),
+ kDraftDowngradeRandom, sizeof(kDraftDowngradeRandom));
+ }
+
+ const SSL_SESSION *session = hs->new_session.get();
+ if (ssl->session != NULL) {
+ session = ssl->session;
+ }
+
+ ScopedCBB cbb;
+ CBB body, session_id;
+ if (!ssl->method->init_message(ssl, cbb.get(), &body, SSL3_MT_SERVER_HELLO) ||
+ !CBB_add_u16(&body, ssl->version) ||
+ !CBB_add_bytes(&body, ssl->s3->server_random, SSL3_RANDOM_SIZE) ||
+ !CBB_add_u8_length_prefixed(&body, &session_id) ||
+ !CBB_add_bytes(&session_id, session->session_id,
+ session->session_id_length) ||
+ !CBB_add_u16(&body, ssl_cipher_get_value(hs->new_cipher)) ||
+ !CBB_add_u8(&body, 0 /* no compression */) ||
+ !ssl_add_serverhello_tlsext(hs, &body) ||
+ !ssl_add_message_cbb(ssl, cbb.get())) {
+ OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
+ return ssl_hs_error;
+ }
+
+ if (ssl->session != NULL) {
+ hs->state = state_send_server_finished;
+ } else {
+ hs->state = state_send_server_certificate;
+ }
+ return ssl_hs_ok;
+}
+
+static enum ssl_hs_wait_t do_send_server_certificate(SSL_HANDSHAKE *hs) {
+ SSL *const ssl = hs->ssl;
+ ScopedCBB cbb;
+
+ if (ssl_cipher_uses_certificate_auth(hs->new_cipher)) {
+ if (!ssl_has_certificate(ssl)) {
+ OPENSSL_PUT_ERROR(SSL, SSL_R_NO_CERTIFICATE_SET);
+ return ssl_hs_error;
+ }
+
+ if (!ssl_output_cert_chain(ssl)) {
+ return ssl_hs_error;
+ }
+
+ if (hs->certificate_status_expected) {
+ CBB body, ocsp_response;
+ if (!ssl->method->init_message(ssl, cbb.get(), &body,
+ SSL3_MT_CERTIFICATE_STATUS) ||
+ !CBB_add_u8(&body, TLSEXT_STATUSTYPE_ocsp) ||
+ !CBB_add_u24_length_prefixed(&body, &ocsp_response) ||
+ !CBB_add_bytes(&ocsp_response,
+ CRYPTO_BUFFER_data(ssl->cert->ocsp_response),
+ CRYPTO_BUFFER_len(ssl->cert->ocsp_response)) ||
+ !ssl_add_message_cbb(ssl, cbb.get())) {
+ OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
+ return ssl_hs_error;
+ }
+ }
+ }
+
+ // Assemble ServerKeyExchange parameters if needed.
+ uint32_t alg_k = hs->new_cipher->algorithm_mkey;
+ uint32_t alg_a = hs->new_cipher->algorithm_auth;
+ if (ssl_cipher_requires_server_key_exchange(hs->new_cipher) ||
+ ((alg_a & SSL_aPSK) && ssl->psk_identity_hint)) {
+
+ // Pre-allocate enough room to comfortably fit an ECDHE public key. Prepend
+ // the client and server randoms for the signing transcript.
+ CBB child;
+ if (!CBB_init(cbb.get(), SSL3_RANDOM_SIZE * 2 + 128) ||
+ !CBB_add_bytes(cbb.get(), ssl->s3->client_random, SSL3_RANDOM_SIZE) ||
+ !CBB_add_bytes(cbb.get(), ssl->s3->server_random, SSL3_RANDOM_SIZE)) {
+ return ssl_hs_error;
+ }
+
+ // PSK ciphers begin with an identity hint.
+ if (alg_a & SSL_aPSK) {
+ size_t len =
+ (ssl->psk_identity_hint == NULL) ? 0 : strlen(ssl->psk_identity_hint);
+ if (!CBB_add_u16_length_prefixed(cbb.get(), &child) ||
+ !CBB_add_bytes(&child, (const uint8_t *)ssl->psk_identity_hint,
+ len)) {
+ return ssl_hs_error;
+ }
+ }
+
+ if (alg_k & SSL_kECDHE) {
+ // Determine the group to use.
+ uint16_t group_id;
+ if (!tls1_get_shared_group(hs, &group_id)) {
+ OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
+ ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
+ return ssl_hs_error;
+ }
+ hs->new_session->group_id = group_id;
+
+ // Set up ECDH, generate a key, and emit the public half.
+ hs->key_share = SSLKeyShare::Create(group_id);
+ if (!hs->key_share ||
+ !CBB_add_u8(cbb.get(), NAMED_CURVE_TYPE) ||
+ !CBB_add_u16(cbb.get(), group_id) ||
+ !CBB_add_u8_length_prefixed(cbb.get(), &child) ||
+ !hs->key_share->Offer(&child)) {
+ return ssl_hs_error;
+ }
+ } else {
+ assert(alg_k & SSL_kPSK);
+ }
+
+ if (!CBBFinishArray(cbb.get(), &hs->server_params)) {
+ return ssl_hs_error;
+ }
+ }
+
+ hs->state = state_send_server_key_exchange;
+ return ssl_hs_ok;
+}
+
+static enum ssl_hs_wait_t do_send_server_key_exchange(SSL_HANDSHAKE *hs) {
+ SSL *const ssl = hs->ssl;
+
+ if (hs->server_params.size() == 0) {
+ hs->state = state_send_server_hello_done;
+ return ssl_hs_ok;
+ }
+
+ ScopedCBB cbb;
+ CBB body, child;
+ if (!ssl->method->init_message(ssl, cbb.get(), &body,
+ SSL3_MT_SERVER_KEY_EXCHANGE) ||
+ // |hs->server_params| contains a prefix for signing.
+ hs->server_params.size() < 2 * SSL3_RANDOM_SIZE ||
+ !CBB_add_bytes(&body, hs->server_params.data() + 2 * SSL3_RANDOM_SIZE,
+ hs->server_params.size() - 2 * SSL3_RANDOM_SIZE)) {
+ return ssl_hs_error;
+ }
+
+ // Add a signature.
+ if (ssl_cipher_uses_certificate_auth(hs->new_cipher)) {
+ if (!ssl_has_private_key(ssl)) {
+ ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
+ return ssl_hs_error;
+ }
+
+ // Determine the signature algorithm.
+ uint16_t signature_algorithm;
+ if (!tls1_choose_signature_algorithm(hs, &signature_algorithm)) {
+ return ssl_hs_error;
+ }
+ if (ssl_protocol_version(ssl) >= TLS1_2_VERSION) {
+ if (!CBB_add_u16(&body, signature_algorithm)) {
+ OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
+ ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
+ return ssl_hs_error;
+ }
+ }
+
+ // Add space for the signature.
+ const size_t max_sig_len = EVP_PKEY_size(hs->local_pubkey.get());
+ uint8_t *ptr;
+ if (!CBB_add_u16_length_prefixed(&body, &child) ||
+ !CBB_reserve(&child, &ptr, max_sig_len)) {
+ return ssl_hs_error;
+ }
+
+ size_t sig_len;
+ switch (ssl_private_key_sign(hs, ptr, &sig_len, max_sig_len,
+ signature_algorithm, hs->server_params)) {
+ case ssl_private_key_success:
+ if (!CBB_did_write(&child, sig_len)) {
+ return ssl_hs_error;
+ }
+ break;
+ case ssl_private_key_failure:
+ return ssl_hs_error;
+ case ssl_private_key_retry:
+ return ssl_hs_private_key_operation;
+ }
+ }
+
+ if (!ssl_add_message_cbb(ssl, cbb.get())) {
+ return ssl_hs_error;
+ }
+
+ hs->server_params.Reset();
+
+ hs->state = state_send_server_hello_done;
+ return ssl_hs_ok;
+}
+
+static enum ssl_hs_wait_t do_send_server_hello_done(SSL_HANDSHAKE *hs) {
+ SSL *const ssl = hs->ssl;
+
+ ScopedCBB cbb;
+ CBB body;
+
+ if (hs->cert_request) {
+ CBB cert_types, sigalgs_cbb;
+ if (!ssl->method->init_message(ssl, cbb.get(), &body,
+ SSL3_MT_CERTIFICATE_REQUEST) ||
+ !CBB_add_u8_length_prefixed(&body, &cert_types) ||
+ !CBB_add_u8(&cert_types, SSL3_CT_RSA_SIGN) ||
+ (ssl_protocol_version(ssl) >= TLS1_VERSION &&
+ !CBB_add_u8(&cert_types, TLS_CT_ECDSA_SIGN)) ||
+ (ssl_protocol_version(ssl) >= TLS1_2_VERSION &&
+ (!CBB_add_u16_length_prefixed(&body, &sigalgs_cbb) ||
+ !tls12_add_verify_sigalgs(ssl, &sigalgs_cbb))) ||
+ !ssl_add_client_CA_list(ssl, &body) ||
+ !ssl_add_message_cbb(ssl, cbb.get())) {
+ OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
+ return ssl_hs_error;
+ }
+ }
+
+ if (!ssl->method->init_message(ssl, cbb.get(), &body,
+ SSL3_MT_SERVER_HELLO_DONE) ||
+ !ssl_add_message_cbb(ssl, cbb.get())) {
+ OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
+ return ssl_hs_error;
+ }
+
+ hs->state = state_read_client_certificate;
+ return ssl_hs_flush;
+}
+
+static enum ssl_hs_wait_t do_read_client_certificate(SSL_HANDSHAKE *hs) {
+ SSL *const ssl = hs->ssl;
+
+ if (!hs->cert_request) {
+ hs->state = state_verify_client_certificate;
+ return ssl_hs_ok;
+ }
+
+ SSLMessage msg;
+ if (!ssl->method->get_message(ssl, &msg)) {
+ return ssl_hs_read_message;
+ }
+
+ if (msg.type != SSL3_MT_CERTIFICATE) {
+ if (ssl->version == SSL3_VERSION &&
+ msg.type == SSL3_MT_CLIENT_KEY_EXCHANGE) {
+ // In SSL 3.0, the Certificate message is omitted to signal no
+ // certificate.
+ if (ssl->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT) {
+ OPENSSL_PUT_ERROR(SSL, SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
+ ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
+ return ssl_hs_error;
+ }
+
+ // OpenSSL returns X509_V_OK when no certificates are received. This is
+ // classed by them as a bug, but it's assumed by at least NGINX.
+ hs->new_session->verify_result = X509_V_OK;
+ hs->state = state_verify_client_certificate;
+ return ssl_hs_ok;
+ }
+
+ OPENSSL_PUT_ERROR(SSL, SSL_R_UNEXPECTED_MESSAGE);
+ ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
+ return ssl_hs_error;
+ }
+
+ if (!ssl_hash_message(hs, msg)) {
+ return ssl_hs_error;
+ }
+
+ CBS certificate_msg = msg.body;
+ uint8_t alert = SSL_AD_DECODE_ERROR;
+ UniquePtr<STACK_OF(CRYPTO_BUFFER)> chain;
+ if (!ssl_parse_cert_chain(&alert, &chain, &hs->peer_pubkey,
+ ssl->retain_only_sha256_of_client_certs
+ ? hs->new_session->peer_sha256
+ : NULL,
+ &certificate_msg, ssl->ctx->pool)) {
+ ssl_send_alert(ssl, SSL3_AL_FATAL, alert);
+ return ssl_hs_error;
+ }
+ sk_CRYPTO_BUFFER_pop_free(hs->new_session->certs, CRYPTO_BUFFER_free);
+ hs->new_session->certs = chain.release();
+
+ if (CBS_len(&certificate_msg) != 0 ||
+ !ssl->ctx->x509_method->session_cache_objects(hs->new_session.get())) {
+ OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR);
+ ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
+ return ssl_hs_error;
+ }
+
+ if (sk_CRYPTO_BUFFER_num(hs->new_session->certs) == 0) {
+ // No client certificate so the handshake buffer may be discarded.
+ hs->transcript.FreeBuffer();
+
+ // In SSL 3.0, sending no certificate is signaled by omitting the
+ // Certificate message.
+ if (ssl->version == SSL3_VERSION) {
+ OPENSSL_PUT_ERROR(SSL, SSL_R_NO_CERTIFICATES_RETURNED);
+ ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
+ return ssl_hs_error;
+ }
+
+ if (ssl->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT) {
+ // Fail for TLS only if we required a certificate
+ OPENSSL_PUT_ERROR(SSL, SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
+ ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
+ return ssl_hs_error;
+ }
+
+ // OpenSSL returns X509_V_OK when no certificates are received. This is
+ // classed by them as a bug, but it's assumed by at least NGINX.
+ hs->new_session->verify_result = X509_V_OK;
+ } else if (ssl->retain_only_sha256_of_client_certs) {
+ // The hash will have been filled in.
+ hs->new_session->peer_sha256_valid = 1;
+ }
+
+ ssl->method->next_message(ssl);
+ hs->state = state_verify_client_certificate;
+ return ssl_hs_ok;
+}
+
+static enum ssl_hs_wait_t do_verify_client_certificate(SSL_HANDSHAKE *hs) {
+ if (sk_CRYPTO_BUFFER_num(hs->new_session->certs) > 0) {
+ switch (ssl_verify_peer_cert(hs)) {
+ case ssl_verify_ok:
+ break;
+ case ssl_verify_invalid:
+ return ssl_hs_error;
+ case ssl_verify_retry:
+ return ssl_hs_certificate_verify;
+ }
+ }
+
+ hs->state = state_read_client_key_exchange;
+ return ssl_hs_ok;
+}
+
+static enum ssl_hs_wait_t do_read_client_key_exchange(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_CLIENT_KEY_EXCHANGE)) {
+ return ssl_hs_error;
+ }
+
+ CBS client_key_exchange = msg.body;
+ uint32_t alg_k = hs->new_cipher->algorithm_mkey;
+ uint32_t alg_a = hs->new_cipher->algorithm_auth;
+
+ // If using a PSK key exchange, parse the PSK identity.
+ if (alg_a & SSL_aPSK) {
+ CBS psk_identity;
+
+ // If using PSK, the ClientKeyExchange contains a psk_identity. If PSK,
+ // then this is the only field in the message.
+ if (!CBS_get_u16_length_prefixed(&client_key_exchange, &psk_identity) ||
+ ((alg_k & SSL_kPSK) && CBS_len(&client_key_exchange) != 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_len(&psk_identity) > PSK_MAX_IDENTITY_LEN ||
+ CBS_contains_zero_byte(&psk_identity)) {
+ OPENSSL_PUT_ERROR(SSL, SSL_R_DATA_LENGTH_TOO_LONG);
+ ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER);
+ return ssl_hs_error;
+ }
+
+ if (!CBS_strdup(&psk_identity, &hs->new_session->psk_identity)) {
+ OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
+ ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
+ return ssl_hs_error;
+ }
+ }
+
+ // Depending on the key exchange method, compute |premaster_secret|.
+ Array<uint8_t> premaster_secret;
+ if (alg_k & SSL_kRSA) {
+ CBS encrypted_premaster_secret;
+ if (ssl->version > SSL3_VERSION) {
+ if (!CBS_get_u16_length_prefixed(&client_key_exchange,
+ &encrypted_premaster_secret) ||
+ CBS_len(&client_key_exchange) != 0) {
+ OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR);
+ ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
+ return ssl_hs_error;
+ }
+ } else {
+ encrypted_premaster_secret = client_key_exchange;
+ }
+
+ // Allocate a buffer large enough for an RSA decryption.
+ Array<uint8_t> decrypt_buf;
+ if (!decrypt_buf.Init(EVP_PKEY_size(hs->local_pubkey.get()))) {
+ return ssl_hs_error;
+ }
+
+ // Decrypt with no padding. PKCS#1 padding will be removed as part of the
+ // timing-sensitive code below.
+ size_t decrypt_len;
+ switch (ssl_private_key_decrypt(hs, decrypt_buf.data(), &decrypt_len,
+ decrypt_buf.size(),
+ encrypted_premaster_secret)) {
+ case ssl_private_key_success:
+ break;
+ case ssl_private_key_failure:
+ return ssl_hs_error;
+ case ssl_private_key_retry:
+ return ssl_hs_private_key_operation;
+ }
+
+ if (decrypt_len != decrypt_buf.size()) {
+ OPENSSL_PUT_ERROR(SSL, SSL_R_DECRYPTION_FAILED);
+ ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECRYPT_ERROR);
+ return ssl_hs_error;
+ }
+
+ // Prepare a random premaster, to be used on invalid padding. See RFC 5246,
+ // section 7.4.7.1.
+ if (!premaster_secret.Init(SSL_MAX_MASTER_KEY_LENGTH) ||
+ !RAND_bytes(premaster_secret.data(), premaster_secret.size())) {
+ return ssl_hs_error;
+ }
+
+ // The smallest padded premaster is 11 bytes of overhead. Small keys are
+ // publicly invalid.
+ if (decrypt_len < 11 + premaster_secret.size()) {
+ OPENSSL_PUT_ERROR(SSL, SSL_R_DECRYPTION_FAILED);
+ ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECRYPT_ERROR);
+ return ssl_hs_error;
+ }
+
+ // Check the padding. See RFC 3447, section 7.2.2.
+ size_t padding_len = decrypt_len - premaster_secret.size();
+ uint8_t good = constant_time_eq_int_8(decrypt_buf[0], 0) &
+ constant_time_eq_int_8(decrypt_buf[1], 2);
+ for (size_t i = 2; i < padding_len - 1; i++) {
+ good &= ~constant_time_is_zero_8(decrypt_buf[i]);
+ }
+ good &= constant_time_is_zero_8(decrypt_buf[padding_len - 1]);
+
+ // The premaster secret must begin with |client_version|. This too must be
+ // checked in constant time (http://eprint.iacr.org/2003/052/).
+ good &= constant_time_eq_8(decrypt_buf[padding_len],
+ (unsigned)(hs->client_version >> 8));
+ good &= constant_time_eq_8(decrypt_buf[padding_len + 1],
+ (unsigned)(hs->client_version & 0xff));
+
+ // Select, in constant time, either the decrypted premaster or the random
+ // premaster based on |good|.
+ for (size_t i = 0; i < premaster_secret.size(); i++) {
+ premaster_secret[i] = constant_time_select_8(
+ good, decrypt_buf[padding_len + i], premaster_secret[i]);
+ }
+ } else if (alg_k & SSL_kECDHE) {
+ // Parse the ClientKeyExchange.
+ CBS peer_key;
+ if (!CBS_get_u8_length_prefixed(&client_key_exchange, &peer_key) ||
+ CBS_len(&client_key_exchange) != 0) {
+ OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR);
+ ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
+ return ssl_hs_error;
+ }
+
+ // Compute the premaster.
+ uint8_t alert = SSL_AD_DECODE_ERROR;
+ if (!hs->key_share->Finish(&premaster_secret, &alert, peer_key)) {
+ ssl_send_alert(ssl, SSL3_AL_FATAL, alert);
+ return ssl_hs_error;
+ }
+
+ // The key exchange state may now be discarded.
+ hs->key_share.reset();
+ } else if (!(alg_k & SSL_kPSK)) {
+ OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
+ ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
+ return ssl_hs_error;
+ }
+
+ // For a PSK cipher suite, the actual pre-master secret is combined with the
+ // pre-shared key.
+ if (alg_a & SSL_aPSK) {
+ if (ssl->psk_server_callback == NULL) {
+ OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
+ ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
+ return ssl_hs_error;
+ }
+
+ // Look up the key for the identity.
+ uint8_t psk[PSK_MAX_PSK_LEN];
+ unsigned psk_len = ssl->psk_server_callback(
+ ssl, hs->new_session->psk_identity, psk, sizeof(psk));
+ if (psk_len > PSK_MAX_PSK_LEN) {
+ OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
+ ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
+ return ssl_hs_error;
+ } else if (psk_len == 0) {
+ // PSK related to the given identity not found.
+ OPENSSL_PUT_ERROR(SSL, SSL_R_PSK_IDENTITY_NOT_FOUND);
+ ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_UNKNOWN_PSK_IDENTITY);
+ return ssl_hs_error;
+ }
+
+ if (alg_k & SSL_kPSK) {
+ // In plain PSK, other_secret is a block of 0s with the same length as the
+ // pre-shared key.
+ if (!premaster_secret.Init(psk_len)) {
+ return ssl_hs_error;
+ }
+ OPENSSL_memset(premaster_secret.data(), 0, premaster_secret.size());
+ }
+
+ ScopedCBB new_premaster;
+ CBB child;
+ if (!CBB_init(new_premaster.get(),
+ 2 + psk_len + 2 + premaster_secret.size()) ||
+ !CBB_add_u16_length_prefixed(new_premaster.get(), &child) ||
+ !CBB_add_bytes(&child, premaster_secret.data(),
+ premaster_secret.size()) ||
+ !CBB_add_u16_length_prefixed(new_premaster.get(), &child) ||
+ !CBB_add_bytes(&child, psk, psk_len) ||
+ !CBBFinishArray(new_premaster.get(), &premaster_secret)) {
+ OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
+ return ssl_hs_error;
+ }
+ }
+
+ if (!ssl_hash_message(hs, msg)) {
+ return ssl_hs_error;
+ }
+
+ // Compute the master secret.
+ hs->new_session->master_key_length = tls1_generate_master_secret(
+ hs, hs->new_session->master_key, premaster_secret);
+ if (hs->new_session->master_key_length == 0) {
+ return ssl_hs_error;
+ }
+ hs->new_session->extended_master_secret = hs->extended_master_secret;
+
+ ssl->method->next_message(ssl);
+ hs->state = state_read_client_certificate_verify;
+ return ssl_hs_ok;
+}
+
+static enum ssl_hs_wait_t do_read_client_certificate_verify(SSL_HANDSHAKE *hs) {
+ SSL *const ssl = hs->ssl;
+
+ // Only RSA and ECDSA client certificates are supported, so a
+ // CertificateVerify is required if and only if there's a client certificate.
+ if (!hs->peer_pubkey) {
+ hs->transcript.FreeBuffer();
+ hs->state = state_read_change_cipher_spec;
+ return ssl_hs_ok;
+ }
+
+ SSLMessage msg;
+ if (!ssl->method->get_message(ssl, &msg)) {
+ return ssl_hs_read_message;
+ }
+
+ if (!ssl_check_message_type(ssl, msg, SSL3_MT_CERTIFICATE_VERIFY)) {
+ return ssl_hs_error;
+ }
+
+ CBS certificate_verify = msg.body, signature;
+
+ // Determine the signature algorithm.
+ uint16_t signature_algorithm = 0;
+ if (ssl_protocol_version(ssl) >= TLS1_2_VERSION) {
+ if (!CBS_get_u16(&certificate_verify, &signature_algorithm)) {
+ OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR);
+ ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
+ return ssl_hs_error;
+ }
+ uint8_t alert = SSL_AD_DECODE_ERROR;
+ if (!tls12_check_peer_sigalg(ssl, &alert, signature_algorithm)) {
+ ssl_send_alert(ssl, SSL3_AL_FATAL, alert);
+ return ssl_hs_error;
+ }
+ hs->new_session->peer_signature_algorithm = signature_algorithm;
+ } else if (!tls1_get_legacy_signature_algorithm(&signature_algorithm,
+ hs->peer_pubkey.get())) {
+ OPENSSL_PUT_ERROR(SSL, SSL_R_PEER_ERROR_UNSUPPORTED_CERTIFICATE_TYPE);
+ ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_UNSUPPORTED_CERTIFICATE);
+ return ssl_hs_error;
+ }
+
+ // Parse and verify the signature.
+ if (!CBS_get_u16_length_prefixed(&certificate_verify, &signature) ||
+ CBS_len(&certificate_verify) != 0) {
+ OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR);
+ ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
+ return ssl_hs_error;
+ }
+
+ bool sig_ok;
+ // The SSL3 construction for CertificateVerify does not decompose into a
+ // single final digest and signature, and must be special-cased.
+ if (ssl_protocol_version(ssl) == SSL3_VERSION) {
+ uint8_t digest[EVP_MAX_MD_SIZE];
+ size_t digest_len;
+ if (!hs->transcript.GetSSL3CertVerifyHash(
+ digest, &digest_len, hs->new_session.get(), signature_algorithm)) {
+ return ssl_hs_error;
+ }
+
+ UniquePtr<EVP_PKEY_CTX> pctx(
+ EVP_PKEY_CTX_new(hs->peer_pubkey.get(), nullptr));
+ sig_ok = pctx &&
+ EVP_PKEY_verify_init(pctx.get()) &&
+ EVP_PKEY_verify(pctx.get(), CBS_data(&signature),
+ CBS_len(&signature), digest, digest_len);
+ } else {
+ sig_ok =
+ ssl_public_key_verify(ssl, signature, signature_algorithm,
+ hs->peer_pubkey.get(), hs->transcript.buffer());
+ }
+
+#if defined(BORINGSSL_UNSAFE_FUZZER_MODE)
+ sig_ok = true;
+ ERR_clear_error();
+#endif
+ if (!sig_ok) {
+ OPENSSL_PUT_ERROR(SSL, SSL_R_BAD_SIGNATURE);
+ ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECRYPT_ERROR);
+ return ssl_hs_error;
+ }
+
+ // The handshake buffer is no longer necessary, and we may hash the current
+ // message.
+ hs->transcript.FreeBuffer();
+ if (!ssl_hash_message(hs, msg)) {
+ return ssl_hs_error;
+ }
+
+ ssl->method->next_message(ssl);
+ hs->state = state_read_change_cipher_spec;
+ return ssl_hs_ok;
+}
+
+static enum ssl_hs_wait_t do_read_change_cipher_spec(SSL_HANDSHAKE *hs) {
+ hs->state = state_process_change_cipher_spec;
+ return ssl_hs_read_change_cipher_spec;
+}
+
+static enum ssl_hs_wait_t do_process_change_cipher_spec(SSL_HANDSHAKE *hs) {
+ if (!tls1_change_cipher_state(hs, evp_aead_open)) {
+ return ssl_hs_error;
+ }
+
+ hs->state = state_read_next_proto;
+ return ssl_hs_ok;
+}
+
+static enum ssl_hs_wait_t do_read_next_proto(SSL_HANDSHAKE *hs) {
+ SSL *const ssl = hs->ssl;
+
+ if (!hs->next_proto_neg_seen) {
+ hs->state = state_read_channel_id;
+ return ssl_hs_ok;
+ }
+
+ SSLMessage msg;
+ if (!ssl->method->get_message(ssl, &msg)) {
+ return ssl_hs_read_message;
+ }
+
+ if (!ssl_check_message_type(ssl, msg, SSL3_MT_NEXT_PROTO) ||
+ !ssl_hash_message(hs, msg)) {
+ return ssl_hs_error;
+ }
+
+ CBS next_protocol = msg.body, selected_protocol, padding;
+ if (!CBS_get_u8_length_prefixed(&next_protocol, &selected_protocol) ||
+ !CBS_get_u8_length_prefixed(&next_protocol, &padding) ||
+ CBS_len(&next_protocol) != 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 (!ssl->s3->next_proto_negotiated.CopyFrom(selected_protocol)) {
+ return ssl_hs_error;
+ }
+
+ ssl->method->next_message(ssl);
+ hs->state = state_read_channel_id;
+ return ssl_hs_ok;
+}
+
+static enum ssl_hs_wait_t do_read_channel_id(SSL_HANDSHAKE *hs) {
+ SSL *const ssl = hs->ssl;
+
+ if (!ssl->s3->tlsext_channel_id_valid) {
+ hs->state = state_read_client_finished;
+ return ssl_hs_ok;
+ }
+
+ SSLMessage msg;
+ if (!ssl->method->get_message(ssl, &msg)) {
+ return ssl_hs_read_message;
+ }
+
+ if (!ssl_check_message_type(ssl, msg, SSL3_MT_CHANNEL_ID) ||
+ !tls1_verify_channel_id(hs, msg) ||
+ !ssl_hash_message(hs, msg)) {
+ return ssl_hs_error;
+ }
+
+ ssl->method->next_message(ssl);
+ hs->state = state_read_client_finished;
+ return ssl_hs_ok;
+}
+
+static enum ssl_hs_wait_t do_read_client_finished(SSL_HANDSHAKE *hs) {
+ SSL *const ssl = hs->ssl;
+ enum ssl_hs_wait_t wait = ssl_get_finished(hs);
+ if (wait != ssl_hs_ok) {
+ return wait;
+ }
+
+ if (ssl->session != NULL) {
+ hs->state = state_finish_server_handshake;
+ } else {
+ hs->state = state_send_server_finished;
+ }
+
+ // If this is a full handshake with ChannelID then record the handshake
+ // hashes in |hs->new_session| in case we need them to verify a
+ // ChannelID signature on a resumption of this session in the future.
+ if (ssl->session == NULL && ssl->s3->tlsext_channel_id_valid &&
+ !tls1_record_handshake_hashes_for_channel_id(hs)) {
+ return ssl_hs_error;
+ }
+
+ return ssl_hs_ok;
+}
+
+static enum ssl_hs_wait_t do_send_server_finished(SSL_HANDSHAKE *hs) {
+ SSL *const ssl = hs->ssl;
+
+ if (hs->ticket_expected) {
+ const SSL_SESSION *session;
+ UniquePtr<SSL_SESSION> session_copy;
+ if (ssl->session == NULL) {
+ // Fix the timeout to measure from the ticket issuance time.
+ ssl_session_rebase_time(ssl, hs->new_session.get());
+ session = hs->new_session.get();
+ } else {
+ // We are renewing an existing session. Duplicate the session to adjust
+ // the timeout.
+ session_copy = SSL_SESSION_dup(ssl->session, SSL_SESSION_INCLUDE_NONAUTH);
+ if (!session_copy) {
+ return ssl_hs_error;
+ }
+
+ ssl_session_rebase_time(ssl, session_copy.get());
+ session = session_copy.get();
+ }
+
+ ScopedCBB cbb;
+ CBB body, ticket;
+ if (!ssl->method->init_message(ssl, cbb.get(), &body,
+ SSL3_MT_NEW_SESSION_TICKET) ||
+ !CBB_add_u32(&body, session->timeout) ||
+ !CBB_add_u16_length_prefixed(&body, &ticket) ||
+ !ssl_encrypt_ticket(ssl, &ticket, session) ||
+ !ssl_add_message_cbb(ssl, cbb.get())) {
+ return ssl_hs_error;
+ }
+ }
+
+ if (!ssl->method->add_change_cipher_spec(ssl) ||
+ !tls1_change_cipher_state(hs, evp_aead_seal) ||
+ !ssl_send_finished(hs)) {
+ return ssl_hs_error;
+ }
+
+ if (ssl->session != NULL) {
+ hs->state = state_read_change_cipher_spec;
+ } else {
+ hs->state = state_finish_server_handshake;
+ }
+ return ssl_hs_flush;
+}
+
+static enum ssl_hs_wait_t do_finish_server_handshake(SSL_HANDSHAKE *hs) {
+ SSL *const ssl = hs->ssl;
+
+ ssl->method->on_handshake_complete(ssl);
+
+ // If we aren't retaining peer certificates then we can discard it now.
+ if (hs->new_session != NULL && ssl->retain_only_sha256_of_client_certs) {
+ sk_CRYPTO_BUFFER_pop_free(hs->new_session->certs, CRYPTO_BUFFER_free);
+ hs->new_session->certs = NULL;
+ ssl->ctx->x509_method->session_clear(hs->new_session.get());
+ }
+
+ if (ssl->session != NULL) {
+ SSL_SESSION_up_ref(ssl->session);
+ ssl->s3->established_session.reset(ssl->session);
+ } else {
+ ssl->s3->established_session = std::move(hs->new_session);
+ ssl->s3->established_session->not_resumable = 0;
+ }
+
+ hs->handshake_finalized = true;
+ ssl->s3->initial_handshake_complete = true;
+ ssl_update_cache(hs, SSL_SESS_CACHE_SERVER);
+
+ hs->state = state_done;
+ return ssl_hs_ok;
+}
+
+enum ssl_hs_wait_t ssl_server_handshake(SSL_HANDSHAKE *hs) {
+ while (hs->state != state_done) {
+ enum ssl_hs_wait_t ret = ssl_hs_error;
+ enum ssl_server_hs_state_t state =
+ static_cast<enum ssl_server_hs_state_t>(hs->state);
+ switch (state) {
+ case state_start_accept:
+ ret = do_start_accept(hs);
+ break;
+ case state_read_client_hello:
+ ret = do_read_client_hello(hs);
+ break;
+ case state_select_certificate:
+ ret = do_select_certificate(hs);
+ break;
+ case state_tls13:
+ ret = do_tls13(hs);
+ break;
+ case state_select_parameters:
+ ret = do_select_parameters(hs);
+ break;
+ case state_send_server_hello:
+ ret = do_send_server_hello(hs);
+ break;
+ case state_send_server_certificate:
+ ret = do_send_server_certificate(hs);
+ break;
+ case state_send_server_key_exchange:
+ ret = do_send_server_key_exchange(hs);
+ break;
+ case state_send_server_hello_done:
+ ret = do_send_server_hello_done(hs);
+ break;
+ case state_read_client_certificate:
+ ret = do_read_client_certificate(hs);
+ break;
+ case state_verify_client_certificate:
+ ret = do_verify_client_certificate(hs);
+ break;
+ case state_read_client_key_exchange:
+ ret = do_read_client_key_exchange(hs);
+ break;
+ case state_read_client_certificate_verify:
+ ret = do_read_client_certificate_verify(hs);
+ break;
+ case state_read_change_cipher_spec:
+ ret = do_read_change_cipher_spec(hs);
+ break;
+ case state_process_change_cipher_spec:
+ ret = do_process_change_cipher_spec(hs);
+ break;
+ case state_read_next_proto:
+ ret = do_read_next_proto(hs);
+ break;
+ case state_read_channel_id:
+ ret = do_read_channel_id(hs);
+ break;
+ case state_read_client_finished:
+ ret = do_read_client_finished(hs);
+ break;
+ case state_send_server_finished:
+ ret = do_send_server_finished(hs);
+ break;
+ case state_finish_server_handshake:
+ ret = do_finish_server_handshake(hs);
+ break;
+ case state_done:
+ ret = ssl_hs_ok;
+ break;
+ }
+
+ if (hs->state != state) {
+ ssl_do_info_callback(hs->ssl, SSL_CB_ACCEPT_LOOP, 1);
+ }
+
+ if (ret != ssl_hs_ok) {
+ return ret;
+ }
+ }
+
+ ssl_do_info_callback(hs->ssl, SSL_CB_HANDSHAKE_DONE, 1);
+ return ssl_hs_ok;
+}
+
+const char *ssl_server_handshake_state(SSL_HANDSHAKE *hs) {
+ enum ssl_server_hs_state_t state =
+ static_cast<enum ssl_server_hs_state_t>(hs->state);
+ switch (state) {
+ case state_start_accept:
+ return "TLS server start_accept";
+ case state_read_client_hello:
+ return "TLS server read_client_hello";
+ case state_select_certificate:
+ return "TLS server select_certificate";
+ case state_tls13:
+ return tls13_server_handshake_state(hs);
+ case state_select_parameters:
+ return "TLS server select_parameters";
+ case state_send_server_hello:
+ return "TLS server send_server_hello";
+ case state_send_server_certificate:
+ return "TLS server send_server_certificate";
+ case state_send_server_key_exchange:
+ return "TLS server send_server_key_exchange";
+ case state_send_server_hello_done:
+ return "TLS server send_server_hello_done";
+ case state_read_client_certificate:
+ return "TLS server read_client_certificate";
+ case state_verify_client_certificate:
+ return "TLS server verify_client_certificate";
+ case state_read_client_key_exchange:
+ return "TLS server read_client_key_exchange";
+ case state_read_client_certificate_verify:
+ return "TLS server read_client_certificate_verify";
+ case state_read_change_cipher_spec:
+ return "TLS server read_change_cipher_spec";
+ case state_process_change_cipher_spec:
+ return "TLS server process_change_cipher_spec";
+ case state_read_next_proto:
+ return "TLS server read_next_proto";
+ case state_read_channel_id:
+ return "TLS server read_channel_id";
+ case state_read_client_finished:
+ return "TLS server read_client_finished";
+ case state_send_server_finished:
+ return "TLS server send_server_finished";
+ case state_finish_server_handshake:
+ return "TLS server finish_server_handshake";
+ case state_done:
+ return "TLS server done";
+ }
+
+ return "TLS server unknown";
+}
+
+}
git://repos.xcallymotion.com / motion2.git / blobdiff