|
- /* 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) 1998-2002 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.
- * ECC cipher suite support in OpenSSL originally developed by
- * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project. */
-
- #include <openssl/ssl.h>
-
- #include <assert.h>
- #include <limits.h>
- #include <string.h>
-
- #include <openssl/buf.h>
- #include <openssl/bytestring.h>
- #include <openssl/err.h>
- #include <openssl/evp.h>
- #include <openssl/mem.h>
- #include <openssl/md5.h>
- #include <openssl/nid.h>
- #include <openssl/rand.h>
- #include <openssl/sha.h>
-
- #include "../crypto/internal.h"
- #include "internal.h"
-
-
- SSL_HANDSHAKE *ssl_handshake_new(SSL *ssl) {
- SSL_HANDSHAKE *hs = OPENSSL_malloc(sizeof(SSL_HANDSHAKE));
- if (hs == NULL) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
- return NULL;
- }
- OPENSSL_memset(hs, 0, sizeof(SSL_HANDSHAKE));
- hs->ssl = ssl;
- hs->wait = ssl_hs_ok;
- hs->state = SSL_ST_INIT;
- if (!SSL_TRANSCRIPT_init(&hs->transcript)) {
- ssl_handshake_free(hs);
- return NULL;
- }
- return hs;
- }
-
- void ssl_handshake_free(SSL_HANDSHAKE *hs) {
- if (hs == NULL) {
- return;
- }
-
- OPENSSL_cleanse(hs->secret, sizeof(hs->secret));
- OPENSSL_cleanse(hs->early_traffic_secret, sizeof(hs->early_traffic_secret));
- OPENSSL_cleanse(hs->client_handshake_secret,
- sizeof(hs->client_handshake_secret));
- OPENSSL_cleanse(hs->server_handshake_secret,
- sizeof(hs->server_handshake_secret));
- OPENSSL_cleanse(hs->client_traffic_secret_0,
- sizeof(hs->client_traffic_secret_0));
- OPENSSL_cleanse(hs->server_traffic_secret_0,
- sizeof(hs->server_traffic_secret_0));
- SSL_ECDH_CTX_cleanup(&hs->ecdh_ctx);
- SSL_TRANSCRIPT_cleanup(&hs->transcript);
- OPENSSL_free(hs->cookie);
- OPENSSL_free(hs->key_share_bytes);
- OPENSSL_free(hs->ecdh_public_key);
- SSL_SESSION_free(hs->new_session);
- SSL_SESSION_free(hs->early_session);
- OPENSSL_free(hs->peer_sigalgs);
- OPENSSL_free(hs->peer_supported_group_list);
- OPENSSL_free(hs->peer_key);
- OPENSSL_free(hs->server_params);
- OPENSSL_free(hs->peer_psk_identity_hint);
- sk_CRYPTO_BUFFER_pop_free(hs->ca_names, CRYPTO_BUFFER_free);
- hs->ssl->ctx->x509_method->hs_flush_cached_ca_names(hs);
- OPENSSL_free(hs->certificate_types);
-
- if (hs->key_block != NULL) {
- OPENSSL_cleanse(hs->key_block, hs->key_block_len);
- OPENSSL_free(hs->key_block);
- }
-
- OPENSSL_free(hs->hostname);
- EVP_PKEY_free(hs->peer_pubkey);
- EVP_PKEY_free(hs->local_pubkey);
- OPENSSL_free(hs);
- }
-
- int ssl_check_message_type(SSL *ssl, int type) {
- if (ssl->s3->tmp.message_type != type) {
- ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
- OPENSSL_PUT_ERROR(SSL, SSL_R_UNEXPECTED_MESSAGE);
- ERR_add_error_dataf("got type %d, wanted type %d",
- ssl->s3->tmp.message_type, type);
- return 0;
- }
-
- return 1;
- }
-
- static int add_record_to_flight(SSL *ssl, uint8_t type, const uint8_t *in,
- size_t in_len) {
- /* We'll never add a flight while in the process of writing it out. */
- assert(ssl->s3->pending_flight_offset == 0);
-
- if (ssl->s3->pending_flight == NULL) {
- ssl->s3->pending_flight = BUF_MEM_new();
- if (ssl->s3->pending_flight == NULL) {
- return 0;
- }
- }
-
- size_t max_out = in_len + SSL_max_seal_overhead(ssl);
- size_t new_cap = ssl->s3->pending_flight->length + max_out;
- if (max_out < in_len || new_cap < max_out) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_OVERFLOW);
- return 0;
- }
-
- size_t len;
- if (!BUF_MEM_reserve(ssl->s3->pending_flight, new_cap) ||
- !tls_seal_record(ssl, (uint8_t *)ssl->s3->pending_flight->data +
- ssl->s3->pending_flight->length,
- &len, max_out, type, in, in_len)) {
- return 0;
- }
-
- ssl->s3->pending_flight->length += len;
- return 1;
- }
-
- int ssl3_init_message(SSL *ssl, CBB *cbb, CBB *body, uint8_t type) {
- /* Pick a modest size hint to save most of the |realloc| calls. */
- if (!CBB_init(cbb, 64) ||
- !CBB_add_u8(cbb, type) ||
- !CBB_add_u24_length_prefixed(cbb, body)) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
- CBB_cleanup(cbb);
- return 0;
- }
-
- return 1;
- }
-
- int ssl3_finish_message(SSL *ssl, CBB *cbb, uint8_t **out_msg,
- size_t *out_len) {
- if (!CBB_finish(cbb, out_msg, out_len)) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
- return 0;
- }
-
- return 1;
- }
-
- int ssl3_add_message(SSL *ssl, uint8_t *msg, size_t len) {
- /* Add the message to the current flight, splitting into several records if
- * needed. */
- int ret = 0;
- size_t added = 0;
- do {
- size_t todo = len - added;
- if (todo > ssl->max_send_fragment) {
- todo = ssl->max_send_fragment;
- }
-
- if (!add_record_to_flight(ssl, SSL3_RT_HANDSHAKE, msg + added, todo)) {
- goto err;
- }
- added += todo;
- } while (added < len);
-
- ssl_do_msg_callback(ssl, 1 /* write */, SSL3_RT_HANDSHAKE, msg, len);
- /* TODO(svaldez): Move this up a layer to fix abstraction for SSL_TRANSCRIPT
- * on hs. */
- if (ssl->s3->hs != NULL &&
- !SSL_TRANSCRIPT_update(&ssl->s3->hs->transcript, msg, len)) {
- goto err;
- }
- ret = 1;
-
- err:
- OPENSSL_free(msg);
- return ret;
- }
-
- int ssl3_add_change_cipher_spec(SSL *ssl) {
- static const uint8_t kChangeCipherSpec[1] = {SSL3_MT_CCS};
-
- if (!add_record_to_flight(ssl, SSL3_RT_CHANGE_CIPHER_SPEC, kChangeCipherSpec,
- sizeof(kChangeCipherSpec))) {
- return 0;
- }
-
- ssl_do_msg_callback(ssl, 1 /* write */, SSL3_RT_CHANGE_CIPHER_SPEC,
- kChangeCipherSpec, sizeof(kChangeCipherSpec));
- return 1;
- }
-
- int ssl3_add_alert(SSL *ssl, uint8_t level, uint8_t desc) {
- uint8_t alert[2] = {level, desc};
- if (!add_record_to_flight(ssl, SSL3_RT_ALERT, alert, sizeof(alert))) {
- return 0;
- }
-
- ssl_do_msg_callback(ssl, 1 /* write */, SSL3_RT_ALERT, alert, sizeof(alert));
- ssl_do_info_callback(ssl, SSL_CB_WRITE_ALERT, ((int)level << 8) | desc);
- return 1;
- }
-
- int ssl_add_message_cbb(SSL *ssl, CBB *cbb) {
- uint8_t *msg;
- size_t len;
- if (!ssl->method->finish_message(ssl, cbb, &msg, &len) ||
- !ssl->method->add_message(ssl, msg, len)) {
- return 0;
- }
-
- return 1;
- }
-
- int ssl3_flush_flight(SSL *ssl) {
- if (ssl->s3->pending_flight == NULL) {
- return 1;
- }
-
- if (ssl->s3->pending_flight->length > 0xffffffff ||
- ssl->s3->pending_flight->length > INT_MAX) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
- return -1;
- }
-
- /* If there is pending data in the write buffer, it must be flushed out before
- * any new data in pending_flight. */
- if (ssl_write_buffer_is_pending(ssl)) {
- int ret = ssl_write_buffer_flush(ssl);
- if (ret <= 0) {
- ssl->rwstate = SSL_WRITING;
- return ret;
- }
- }
-
- /* Write the pending flight. */
- while (ssl->s3->pending_flight_offset < ssl->s3->pending_flight->length) {
- int ret = BIO_write(
- ssl->wbio,
- ssl->s3->pending_flight->data + ssl->s3->pending_flight_offset,
- ssl->s3->pending_flight->length - ssl->s3->pending_flight_offset);
- if (ret <= 0) {
- ssl->rwstate = SSL_WRITING;
- return ret;
- }
-
- ssl->s3->pending_flight_offset += ret;
- }
-
- if (BIO_flush(ssl->wbio) <= 0) {
- ssl->rwstate = SSL_WRITING;
- return -1;
- }
-
- BUF_MEM_free(ssl->s3->pending_flight);
- ssl->s3->pending_flight = NULL;
- ssl->s3->pending_flight_offset = 0;
- return 1;
- }
-
- int ssl3_send_finished(SSL_HANDSHAKE *hs) {
- SSL *const ssl = hs->ssl;
- const SSL_SESSION *session = SSL_get_session(ssl);
-
- uint8_t finished[EVP_MAX_MD_SIZE];
- size_t finished_len;
- if (!SSL_TRANSCRIPT_finish_mac(&hs->transcript, finished, &finished_len,
- session, ssl->server,
- ssl3_protocol_version(ssl))) {
- return 0;
- }
-
- /* Log the master secret, if logging is enabled. */
- if (!ssl_log_secret(ssl, "CLIENT_RANDOM",
- session->master_key,
- session->master_key_length)) {
- return 0;
- }
-
- /* Copy the Finished so we can use it for renegotiation checks. */
- if (ssl->version != SSL3_VERSION) {
- if (finished_len > sizeof(ssl->s3->previous_client_finished) ||
- finished_len > sizeof(ssl->s3->previous_server_finished)) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
- return -1;
- }
-
- if (ssl->server) {
- OPENSSL_memcpy(ssl->s3->previous_server_finished, finished, finished_len);
- ssl->s3->previous_server_finished_len = finished_len;
- } else {
- OPENSSL_memcpy(ssl->s3->previous_client_finished, finished, finished_len);
- ssl->s3->previous_client_finished_len = finished_len;
- }
- }
-
- CBB cbb, body;
- if (!ssl->method->init_message(ssl, &cbb, &body, SSL3_MT_FINISHED) ||
- !CBB_add_bytes(&body, finished, finished_len) ||
- !ssl_add_message_cbb(ssl, &cbb)) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
- CBB_cleanup(&cbb);
- return -1;
- }
-
- return 1;
- }
-
- int ssl3_get_finished(SSL_HANDSHAKE *hs) {
- SSL *const ssl = hs->ssl;
- int ret = ssl->method->ssl_get_message(ssl);
- if (ret <= 0) {
- return ret;
- }
-
- if (!ssl_check_message_type(ssl, SSL3_MT_FINISHED)) {
- return -1;
- }
-
- /* Snapshot the finished hash before incorporating the new message. */
- uint8_t finished[EVP_MAX_MD_SIZE];
- size_t finished_len;
- if (!SSL_TRANSCRIPT_finish_mac(&hs->transcript, finished, &finished_len,
- SSL_get_session(ssl), !ssl->server,
- ssl3_protocol_version(ssl)) ||
- !ssl_hash_current_message(hs)) {
- return -1;
- }
-
- int finished_ok = ssl->init_num == finished_len &&
- CRYPTO_memcmp(ssl->init_msg, finished, finished_len) == 0;
- #if defined(BORINGSSL_UNSAFE_FUZZER_MODE)
- finished_ok = 1;
- #endif
- if (!finished_ok) {
- ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECRYPT_ERROR);
- OPENSSL_PUT_ERROR(SSL, SSL_R_DIGEST_CHECK_FAILED);
- return -1;
- }
-
- /* Copy the Finished so we can use it for renegotiation checks. */
- if (ssl->version != SSL3_VERSION) {
- if (finished_len > sizeof(ssl->s3->previous_client_finished) ||
- finished_len > sizeof(ssl->s3->previous_server_finished)) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
- return -1;
- }
-
- if (ssl->server) {
- OPENSSL_memcpy(ssl->s3->previous_client_finished, finished, finished_len);
- ssl->s3->previous_client_finished_len = finished_len;
- } else {
- OPENSSL_memcpy(ssl->s3->previous_server_finished, finished, finished_len);
- ssl->s3->previous_server_finished_len = finished_len;
- }
- }
-
- return 1;
- }
-
- int ssl3_output_cert_chain(SSL *ssl) {
- CBB cbb, body;
- if (!ssl->method->init_message(ssl, &cbb, &body, SSL3_MT_CERTIFICATE) ||
- !ssl_add_cert_chain(ssl, &body) ||
- !ssl_add_message_cbb(ssl, &cbb)) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
- CBB_cleanup(&cbb);
- return 0;
- }
-
- return 1;
- }
-
- size_t ssl_max_handshake_message_len(const SSL *ssl) {
- /* kMaxMessageLen is the default maximum message size for handshakes which do
- * not accept peer certificate chains. */
- static const size_t kMaxMessageLen = 16384;
-
- if (SSL_in_init(ssl)) {
- if ((!ssl->server || (ssl->verify_mode & SSL_VERIFY_PEER)) &&
- kMaxMessageLen < ssl->max_cert_list) {
- return ssl->max_cert_list;
- }
- return kMaxMessageLen;
- }
-
- if (ssl3_protocol_version(ssl) < TLS1_3_VERSION) {
- /* In TLS 1.2 and below, the largest acceptable post-handshake message is
- * a HelloRequest. */
- return 0;
- }
-
- if (ssl->server) {
- /* The largest acceptable post-handshake message for a server is a
- * KeyUpdate. We will never initiate post-handshake auth. */
- return 1;
- }
-
- /* Clients must accept NewSessionTicket and CertificateRequest, so allow the
- * default size. */
- return kMaxMessageLen;
- }
-
- static int extend_handshake_buffer(SSL *ssl, size_t length) {
- if (!BUF_MEM_reserve(ssl->init_buf, length)) {
- return -1;
- }
- while (ssl->init_buf->length < length) {
- int ret = ssl3_read_handshake_bytes(
- ssl, (uint8_t *)ssl->init_buf->data + ssl->init_buf->length,
- length - ssl->init_buf->length);
- if (ret <= 0) {
- return ret;
- }
- ssl->init_buf->length += (size_t)ret;
- }
- return 1;
- }
-
- static int read_v2_client_hello(SSL *ssl) {
- /* Read the first 5 bytes, the size of the TLS record header. This is
- * sufficient to detect a V2ClientHello and ensures that we never read beyond
- * the first record. */
- int ret = ssl_read_buffer_extend_to(ssl, SSL3_RT_HEADER_LENGTH);
- if (ret <= 0) {
- return ret;
- }
- const uint8_t *p = ssl_read_buffer(ssl);
-
- /* Some dedicated error codes for protocol mixups should the application wish
- * to interpret them differently. (These do not overlap with ClientHello or
- * V2ClientHello.) */
- if (strncmp("GET ", (const char *)p, 4) == 0 ||
- strncmp("POST ", (const char *)p, 5) == 0 ||
- strncmp("HEAD ", (const char *)p, 5) == 0 ||
- strncmp("PUT ", (const char *)p, 4) == 0) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_HTTP_REQUEST);
- return -1;
- }
- if (strncmp("CONNE", (const char *)p, 5) == 0) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_HTTPS_PROXY_REQUEST);
- return -1;
- }
-
- if ((p[0] & 0x80) == 0 || p[2] != SSL2_MT_CLIENT_HELLO ||
- p[3] != SSL3_VERSION_MAJOR) {
- /* Not a V2ClientHello. */
- return 1;
- }
-
- /* Determine the length of the V2ClientHello. */
- size_t msg_length = ((p[0] & 0x7f) << 8) | p[1];
- if (msg_length > (1024 * 4)) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_RECORD_TOO_LARGE);
- return -1;
- }
- if (msg_length < SSL3_RT_HEADER_LENGTH - 2) {
- /* Reject lengths that are too short early. We have already read
- * |SSL3_RT_HEADER_LENGTH| bytes, so we should not attempt to process an
- * (invalid) V2ClientHello which would be shorter than that. */
- OPENSSL_PUT_ERROR(SSL, SSL_R_RECORD_LENGTH_MISMATCH);
- return -1;
- }
-
- /* Read the remainder of the V2ClientHello. */
- ret = ssl_read_buffer_extend_to(ssl, 2 + msg_length);
- if (ret <= 0) {
- return ret;
- }
-
- CBS v2_client_hello;
- CBS_init(&v2_client_hello, ssl_read_buffer(ssl) + 2, msg_length);
-
- /* The V2ClientHello without the length is incorporated into the handshake
- * hash. This is only ever called at the start of the handshake, so hs is
- * guaranteed to be non-NULL. */
- if (!SSL_TRANSCRIPT_update(&ssl->s3->hs->transcript,
- CBS_data(&v2_client_hello),
- CBS_len(&v2_client_hello))) {
- return -1;
- }
-
- ssl_do_msg_callback(ssl, 0 /* read */, 0 /* V2ClientHello */,
- CBS_data(&v2_client_hello), CBS_len(&v2_client_hello));
-
- uint8_t msg_type;
- uint16_t version, cipher_spec_length, session_id_length, challenge_length;
- CBS cipher_specs, session_id, challenge;
- if (!CBS_get_u8(&v2_client_hello, &msg_type) ||
- !CBS_get_u16(&v2_client_hello, &version) ||
- !CBS_get_u16(&v2_client_hello, &cipher_spec_length) ||
- !CBS_get_u16(&v2_client_hello, &session_id_length) ||
- !CBS_get_u16(&v2_client_hello, &challenge_length) ||
- !CBS_get_bytes(&v2_client_hello, &cipher_specs, cipher_spec_length) ||
- !CBS_get_bytes(&v2_client_hello, &session_id, session_id_length) ||
- !CBS_get_bytes(&v2_client_hello, &challenge, challenge_length) ||
- CBS_len(&v2_client_hello) != 0) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR);
- return -1;
- }
-
- /* msg_type has already been checked. */
- assert(msg_type == SSL2_MT_CLIENT_HELLO);
-
- /* The client_random is the V2ClientHello challenge. Truncate or
- * left-pad with zeros as needed. */
- size_t rand_len = CBS_len(&challenge);
- if (rand_len > SSL3_RANDOM_SIZE) {
- rand_len = SSL3_RANDOM_SIZE;
- }
- uint8_t random[SSL3_RANDOM_SIZE];
- OPENSSL_memset(random, 0, SSL3_RANDOM_SIZE);
- OPENSSL_memcpy(random + (SSL3_RANDOM_SIZE - rand_len), CBS_data(&challenge),
- rand_len);
-
- /* Write out an equivalent SSLv3 ClientHello. */
- size_t max_v3_client_hello = SSL3_HM_HEADER_LENGTH + 2 /* version */ +
- SSL3_RANDOM_SIZE + 1 /* session ID length */ +
- 2 /* cipher list length */ +
- CBS_len(&cipher_specs) / 3 * 2 +
- 1 /* compression length */ + 1 /* compression */;
- CBB client_hello, hello_body, cipher_suites;
- CBB_zero(&client_hello);
- if (!BUF_MEM_reserve(ssl->init_buf, max_v3_client_hello) ||
- !CBB_init_fixed(&client_hello, (uint8_t *)ssl->init_buf->data,
- ssl->init_buf->max) ||
- !CBB_add_u8(&client_hello, SSL3_MT_CLIENT_HELLO) ||
- !CBB_add_u24_length_prefixed(&client_hello, &hello_body) ||
- !CBB_add_u16(&hello_body, version) ||
- !CBB_add_bytes(&hello_body, random, SSL3_RANDOM_SIZE) ||
- /* No session id. */
- !CBB_add_u8(&hello_body, 0) ||
- !CBB_add_u16_length_prefixed(&hello_body, &cipher_suites)) {
- CBB_cleanup(&client_hello);
- OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
- return -1;
- }
-
- /* Copy the cipher suites. */
- while (CBS_len(&cipher_specs) > 0) {
- uint32_t cipher_spec;
- if (!CBS_get_u24(&cipher_specs, &cipher_spec)) {
- CBB_cleanup(&client_hello);
- OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR);
- return -1;
- }
-
- /* Skip SSLv2 ciphers. */
- if ((cipher_spec & 0xff0000) != 0) {
- continue;
- }
- if (!CBB_add_u16(&cipher_suites, cipher_spec)) {
- CBB_cleanup(&client_hello);
- OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
- return -1;
- }
- }
-
- /* Add the null compression scheme and finish. */
- if (!CBB_add_u8(&hello_body, 1) || !CBB_add_u8(&hello_body, 0) ||
- !CBB_finish(&client_hello, NULL, &ssl->init_buf->length)) {
- CBB_cleanup(&client_hello);
- OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
- return -1;
- }
-
- /* Consume and discard the V2ClientHello. */
- ssl_read_buffer_consume(ssl, 2 + msg_length);
- ssl_read_buffer_discard(ssl);
-
- ssl->s3->is_v2_hello = 1;
- return 1;
- }
-
- int ssl3_get_message(SSL *ssl) {
- /* Re-create the handshake buffer if needed. */
- if (ssl->init_buf == NULL) {
- ssl->init_buf = BUF_MEM_new();
- if (ssl->init_buf == NULL) {
- return -1;
- }
- }
-
- if (ssl->server && !ssl->s3->v2_hello_done) {
- /* Bypass the record layer for the first message to handle V2ClientHello. */
- int ret = read_v2_client_hello(ssl);
- if (ret <= 0) {
- return ret;
- }
- ssl->s3->v2_hello_done = 1;
- }
-
- if (ssl->s3->tmp.reuse_message) {
- /* There must be a current message. */
- assert(ssl->init_msg != NULL);
- ssl->s3->tmp.reuse_message = 0;
- } else {
- ssl3_release_current_message(ssl, 0 /* don't free buffer */);
- }
-
- /* Read the message header, if we haven't yet. */
- int ret = extend_handshake_buffer(ssl, SSL3_HM_HEADER_LENGTH);
- if (ret <= 0) {
- return ret;
- }
-
- /* Parse out the length. Cap it so the peer cannot force us to buffer up to
- * 2^24 bytes. */
- const uint8_t *p = (uint8_t *)ssl->init_buf->data;
- size_t msg_len = (((uint32_t)p[1]) << 16) | (((uint32_t)p[2]) << 8) | p[3];
- if (msg_len > ssl_max_handshake_message_len(ssl)) {
- ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER);
- OPENSSL_PUT_ERROR(SSL, SSL_R_EXCESSIVE_MESSAGE_SIZE);
- return -1;
- }
-
- /* Read the message body, if we haven't yet. */
- ret = extend_handshake_buffer(ssl, SSL3_HM_HEADER_LENGTH + msg_len);
- if (ret <= 0) {
- return ret;
- }
-
- /* We have now received a complete message. */
- ssl_do_msg_callback(ssl, 0 /* read */, SSL3_RT_HANDSHAKE, ssl->init_buf->data,
- ssl->init_buf->length);
-
- ssl->s3->tmp.message_type = ((const uint8_t *)ssl->init_buf->data)[0];
- ssl->init_msg = (uint8_t*)ssl->init_buf->data + SSL3_HM_HEADER_LENGTH;
- ssl->init_num = ssl->init_buf->length - SSL3_HM_HEADER_LENGTH;
- return 1;
- }
-
- void ssl3_get_current_message(const SSL *ssl, CBS *out) {
- CBS_init(out, (uint8_t *)ssl->init_buf->data, ssl->init_buf->length);
- }
-
- int ssl_hash_current_message(SSL_HANDSHAKE *hs) {
- /* V2ClientHellos are hashed implicitly. */
- if (hs->ssl->s3->is_v2_hello) {
- return 1;
- }
-
- CBS cbs;
- hs->ssl->method->get_current_message(hs->ssl, &cbs);
- return SSL_TRANSCRIPT_update(&hs->transcript, CBS_data(&cbs), CBS_len(&cbs));
- }
-
- void ssl3_release_current_message(SSL *ssl, int free_buffer) {
- if (ssl->init_msg != NULL) {
- /* |init_buf| never contains data beyond the current message. */
- assert(SSL3_HM_HEADER_LENGTH + ssl->init_num == ssl->init_buf->length);
-
- /* Clear the current message. */
- ssl->init_msg = NULL;
- ssl->init_num = 0;
- ssl->init_buf->length = 0;
- ssl->s3->is_v2_hello = 0;
- }
-
- if (free_buffer) {
- BUF_MEM_free(ssl->init_buf);
- ssl->init_buf = NULL;
- }
- }
-
- int ssl_parse_extensions(const CBS *cbs, uint8_t *out_alert,
- const SSL_EXTENSION_TYPE *ext_types,
- size_t num_ext_types, int ignore_unknown) {
- /* Reset everything. */
- for (size_t i = 0; i < num_ext_types; i++) {
- *ext_types[i].out_present = 0;
- CBS_init(ext_types[i].out_data, NULL, 0);
- }
-
- CBS copy = *cbs;
- while (CBS_len(©) != 0) {
- uint16_t type;
- CBS data;
- if (!CBS_get_u16(©, &type) ||
- !CBS_get_u16_length_prefixed(©, &data)) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_PARSE_TLSEXT);
- *out_alert = SSL_AD_DECODE_ERROR;
- return 0;
- }
-
- const SSL_EXTENSION_TYPE *ext_type = NULL;
- for (size_t i = 0; i < num_ext_types; i++) {
- if (type == ext_types[i].type) {
- ext_type = &ext_types[i];
- break;
- }
- }
-
- if (ext_type == NULL) {
- if (ignore_unknown) {
- continue;
- }
- OPENSSL_PUT_ERROR(SSL, SSL_R_UNEXPECTED_EXTENSION);
- *out_alert = SSL_AD_UNSUPPORTED_EXTENSION;
- return 0;
- }
-
- /* Duplicate ext_types are forbidden. */
- if (*ext_type->out_present) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_DUPLICATE_EXTENSION);
- *out_alert = SSL_AD_ILLEGAL_PARAMETER;
- return 0;
- }
-
- *ext_type->out_present = 1;
- *ext_type->out_data = data;
- }
-
- return 1;
- }
|