| /* 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" |
| |
| |
| namespace bssl { |
| |
| 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, Array<uint8_t> *out_msg) { |
| return CBBFinishArray(cbb, out_msg); |
| } |
| |
| int ssl3_add_message(SSL *ssl, Array<uint8_t> msg) { |
| // Add the message to the current flight, splitting into several records if |
| // needed. |
| size_t added = 0; |
| do { |
| size_t todo = msg.size() - added; |
| if (todo > ssl->max_send_fragment) { |
| todo = ssl->max_send_fragment; |
| } |
| |
| uint8_t type = SSL3_RT_HANDSHAKE; |
| if (ssl->server && |
| ssl->s3->have_version && |
| ssl->version == TLS1_3_RECORD_TYPE_EXPERIMENT_VERSION && |
| ssl->s3->aead_write_ctx->is_null_cipher()) { |
| type = SSL3_RT_PLAINTEXT_HANDSHAKE; |
| } |
| |
| if (!add_record_to_flight(ssl, type, msg.data() + added, todo)) { |
| return 0; |
| } |
| added += todo; |
| } while (added < msg.size()); |
| |
| ssl_do_msg_callback(ssl, 1 /* write */, SSL3_RT_HANDSHAKE, msg.data(), |
| msg.size()); |
| // TODO(svaldez): Move this up a layer to fix abstraction for SSLTranscript on |
| // hs. |
| if (ssl->s3->hs != NULL && |
| !ssl->s3->hs->transcript.Update(msg.data(), msg.size())) { |
| return 0; |
| } |
| return 1; |
| } |
| |
| 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 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 (!hs->transcript.GetFinishedMAC(finished, &finished_len, session, |
| ssl->server)) { |
| 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 0; |
| } |
| |
| 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; |
| } |
| } |
| |
| ScopedCBB cbb; |
| CBB body; |
| if (!ssl->method->init_message(ssl, cbb.get(), &body, SSL3_MT_FINISHED) || |
| !CBB_add_bytes(&body, finished, finished_len) || |
| !ssl_add_message_cbb(ssl, cbb.get())) { |
| OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); |
| return 0; |
| } |
| |
| return 1; |
| } |
| |
| int ssl3_output_cert_chain(SSL *ssl) { |
| ScopedCBB cbb; |
| CBB body; |
| if (!ssl->method->init_message(ssl, cbb.get(), &body, SSL3_MT_CERTIFICATE) || |
| !ssl_add_cert_chain(ssl, &body) || |
| !ssl_add_message_cbb(ssl, cbb.get())) { |
| OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); |
| return 0; |
| } |
| |
| return 1; |
| } |
| |
| 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->s3->hs->transcript.Update(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 */; |
| ScopedCBB client_hello; |
| CBB hello_body, cipher_suites; |
| if (!BUF_MEM_reserve(ssl->init_buf, max_v3_client_hello) || |
| !CBB_init_fixed(client_hello.get(), (uint8_t *)ssl->init_buf->data, |
| ssl->init_buf->max) || |
| !CBB_add_u8(client_hello.get(), SSL3_MT_CLIENT_HELLO) || |
| !CBB_add_u24_length_prefixed(client_hello.get(), &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)) { |
| 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)) { |
| 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)) { |
| 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.get(), NULL, &ssl->init_buf->length)) { |
| 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 = true; |
| return 1; |
| } |
| |
| // TODO(davidben): Remove |out_bytes_needed| and inline into |ssl3_get_message| |
| // when the entire record is copied into |init_buf|. |
| static bool parse_message(SSL *ssl, SSLMessage *out, size_t *out_bytes_needed) { |
| if (ssl->init_buf == NULL) { |
| *out_bytes_needed = 4; |
| return false; |
| } |
| |
| CBS cbs; |
| uint32_t len; |
| CBS_init(&cbs, reinterpret_cast<const uint8_t *>(ssl->init_buf->data), |
| ssl->init_buf->length); |
| if (!CBS_get_u8(&cbs, &out->type) || |
| !CBS_get_u24(&cbs, &len)) { |
| *out_bytes_needed = 4; |
| return false; |
| } |
| |
| if (!CBS_get_bytes(&cbs, &out->body, len)) { |
| *out_bytes_needed = 4 + len; |
| return false; |
| } |
| |
| CBS_init(&out->raw, reinterpret_cast<const uint8_t *>(ssl->init_buf->data), |
| 4 + len); |
| out->is_v2_hello = ssl->s3->is_v2_hello; |
| if (!ssl->s3->has_message) { |
| if (!out->is_v2_hello) { |
| ssl_do_msg_callback(ssl, 0 /* read */, SSL3_RT_HANDSHAKE, |
| CBS_data(&out->raw), CBS_len(&out->raw)); |
| } |
| ssl->s3->has_message = true; |
| } |
| return true; |
| } |
| |
| bool ssl3_get_message(SSL *ssl, SSLMessage *out) { |
| size_t unused; |
| return parse_message(ssl, out, &unused); |
| } |
| |
| int ssl3_read_message(SSL *ssl) { |
| SSLMessage msg; |
| size_t bytes_needed; |
| if (parse_message(ssl, &msg, &bytes_needed)) { |
| OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); |
| return -1; |
| } |
| |
| // Enforce the limit so the peer cannot force us to buffer 16MB. |
| if (bytes_needed > 4 + 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; |
| } |
| |
| // 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; |
| } |
| } |
| |
| // Bypass the record layer for the first message to handle V2ClientHello. |
| if (ssl->server && !ssl->s3->v2_hello_done) { |
| int ret = read_v2_client_hello(ssl); |
| if (ret > 0) { |
| ssl->s3->v2_hello_done = true; |
| } |
| return ret; |
| } |
| |
| return extend_handshake_buffer(ssl, bytes_needed); |
| } |
| |
| void ssl3_next_message(SSL *ssl) { |
| SSLMessage msg; |
| if (!ssl3_get_message(ssl, &msg) || |
| ssl->init_buf == NULL || |
| ssl->init_buf->length < CBS_len(&msg.raw)) { |
| assert(0); |
| return; |
| } |
| |
| OPENSSL_memmove(ssl->init_buf->data, ssl->init_buf->data + CBS_len(&msg.raw), |
| ssl->init_buf->length - CBS_len(&msg.raw)); |
| ssl->init_buf->length -= CBS_len(&msg.raw); |
| ssl->s3->is_v2_hello = false; |
| ssl->s3->has_message = false; |
| |
| // Post-handshake messages are rare, so release the buffer after every |
| // message. During the handshake, |on_handshake_complete| will release it. |
| if (!SSL_in_init(ssl) && ssl->init_buf->length == 0) { |
| BUF_MEM_free(ssl->init_buf); |
| ssl->init_buf = NULL; |
| } |
| } |
| |
| } // namespace bssl |