diff options
Diffstat (limited to 'src/ssl/tls_record.c')
| -rw-r--r-- | src/ssl/tls_record.c | 338 |
1 files changed, 0 insertions, 338 deletions
diff --git a/src/ssl/tls_record.c b/src/ssl/tls_record.c deleted file mode 100644 index 36e31b4..0000000 --- a/src/ssl/tls_record.c +++ /dev/null @@ -1,338 +0,0 @@ -/* 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). */ - -#include <openssl/ssl.h> - -#include <assert.h> - -#include <openssl/bytestring.h> -#include <openssl/err.h> - -#include "internal.h" - - -/* kMaxEmptyRecords is the number of consecutive, empty records that will be - * processed. Without this limit an attacker could send empty records at a - * faster rate than we can process and cause record processing to loop - * forever. */ -static const uint8_t kMaxEmptyRecords = 32; - -size_t ssl_record_prefix_len(const SSL *ssl) { - if (SSL_IS_DTLS(ssl)) { - return DTLS1_RT_HEADER_LENGTH + - SSL_AEAD_CTX_explicit_nonce_len(ssl->aead_read_ctx); - } else { - return SSL3_RT_HEADER_LENGTH + - SSL_AEAD_CTX_explicit_nonce_len(ssl->aead_read_ctx); - } -} - -size_t ssl_seal_prefix_len(const SSL *ssl) { - if (SSL_IS_DTLS(ssl)) { - return DTLS1_RT_HEADER_LENGTH + - SSL_AEAD_CTX_explicit_nonce_len(ssl->aead_write_ctx); - } else { - size_t ret = SSL3_RT_HEADER_LENGTH + - SSL_AEAD_CTX_explicit_nonce_len(ssl->aead_write_ctx); - if (ssl->s3->need_record_splitting) { - ret += SSL3_RT_HEADER_LENGTH; - ret += ssl_cipher_get_record_split_len(ssl->aead_write_ctx->cipher); - } - return ret; - } -} - -size_t ssl_max_seal_overhead(const SSL *ssl) { - if (SSL_IS_DTLS(ssl)) { - return DTLS1_RT_HEADER_LENGTH + - SSL_AEAD_CTX_max_overhead(ssl->aead_write_ctx); - } else { - size_t ret = SSL3_RT_HEADER_LENGTH + - SSL_AEAD_CTX_max_overhead(ssl->aead_write_ctx); - if (ssl->s3->need_record_splitting) { - ret *= 2; - } - return ret; - } -} - -enum ssl_open_record_t tls_open_record( - SSL *ssl, uint8_t *out_type, uint8_t *out, size_t *out_len, - size_t *out_consumed, uint8_t *out_alert, size_t max_out, const uint8_t *in, - size_t in_len) { - CBS cbs; - CBS_init(&cbs, in, in_len); - - /* Decode the record header. */ - uint8_t type; - uint16_t version, ciphertext_len; - if (!CBS_get_u8(&cbs, &type) || - !CBS_get_u16(&cbs, &version) || - !CBS_get_u16(&cbs, &ciphertext_len)) { - *out_consumed = SSL3_RT_HEADER_LENGTH; - return ssl_open_record_partial; - } - - /* Check the version. */ - if ((ssl->s3->have_version && version != ssl->version) || - (version >> 8) != SSL3_VERSION_MAJOR) { - OPENSSL_PUT_ERROR(SSL, SSL_R_WRONG_VERSION_NUMBER); - *out_alert = SSL_AD_PROTOCOL_VERSION; - return ssl_open_record_error; - } - - /* Check the ciphertext length. */ - size_t extra = 0; - if (ssl->options & SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER) { - extra = SSL3_RT_MAX_EXTRA; - } - if (ciphertext_len > SSL3_RT_MAX_ENCRYPTED_LENGTH + extra) { - OPENSSL_PUT_ERROR(SSL, SSL_R_ENCRYPTED_LENGTH_TOO_LONG); - *out_alert = SSL_AD_RECORD_OVERFLOW; - return ssl_open_record_error; - } - - /* Extract the body. */ - CBS body; - if (!CBS_get_bytes(&cbs, &body, ciphertext_len)) { - *out_consumed = SSL3_RT_HEADER_LENGTH + (size_t)ciphertext_len; - return ssl_open_record_partial; - } - - if (ssl->msg_callback != NULL) { - ssl->msg_callback(0 /* read */, 0, SSL3_RT_HEADER, in, - SSL3_RT_HEADER_LENGTH, ssl, ssl->msg_callback_arg); - } - - /* Decrypt the body. */ - size_t plaintext_len; - if (!SSL_AEAD_CTX_open(ssl->aead_read_ctx, out, &plaintext_len, max_out, - type, version, ssl->s3->read_sequence, CBS_data(&body), - CBS_len(&body))) { - OPENSSL_PUT_ERROR(SSL, SSL_R_DECRYPTION_FAILED_OR_BAD_RECORD_MAC); - *out_alert = SSL_AD_BAD_RECORD_MAC; - return ssl_open_record_error; - } - if (!ssl3_record_sequence_update(ssl->s3->read_sequence, 8)) { - *out_alert = SSL_AD_INTERNAL_ERROR; - return ssl_open_record_error; - } - - /* Check the plaintext length. */ - if (plaintext_len > SSL3_RT_MAX_PLAIN_LENGTH + extra) { - OPENSSL_PUT_ERROR(SSL, SSL_R_DATA_LENGTH_TOO_LONG); - *out_alert = SSL_AD_RECORD_OVERFLOW; - return ssl_open_record_error; - } - - /* Limit the number of consecutive empty records. */ - if (plaintext_len == 0) { - ssl->s3->empty_record_count++; - if (ssl->s3->empty_record_count > kMaxEmptyRecords) { - OPENSSL_PUT_ERROR(SSL, SSL_R_TOO_MANY_EMPTY_FRAGMENTS); - *out_alert = SSL_AD_UNEXPECTED_MESSAGE; - return ssl_open_record_error; - } - /* Apart from the limit, empty records are returned up to the caller. This - * allows the caller to reject records of the wrong type. */ - } else { - ssl->s3->empty_record_count = 0; - } - - *out_type = type; - *out_len = plaintext_len; - *out_consumed = in_len - CBS_len(&cbs); - return ssl_open_record_success; -} - -static int do_seal_record(SSL *ssl, uint8_t *out, size_t *out_len, - size_t max_out, uint8_t type, const uint8_t *in, - size_t in_len) { - if (max_out < SSL3_RT_HEADER_LENGTH) { - OPENSSL_PUT_ERROR(SSL, SSL_R_BUFFER_TOO_SMALL); - return 0; - } - /* Check the record header does not alias any part of the input. - * |SSL_AEAD_CTX_seal| will internally enforce other aliasing requirements. */ - if (in < out + SSL3_RT_HEADER_LENGTH && out < in + in_len) { - OPENSSL_PUT_ERROR(SSL, SSL_R_OUTPUT_ALIASES_INPUT); - return 0; - } - - out[0] = type; - - /* Some servers hang if initial ClientHello is larger than 256 bytes and - * record version number > TLS 1.0. */ - uint16_t wire_version = ssl->version; - if (!ssl->s3->have_version && ssl->version > SSL3_VERSION) { - wire_version = TLS1_VERSION; - } - out[1] = wire_version >> 8; - out[2] = wire_version & 0xff; - - size_t ciphertext_len; - if (!SSL_AEAD_CTX_seal(ssl->aead_write_ctx, out + SSL3_RT_HEADER_LENGTH, - &ciphertext_len, max_out - SSL3_RT_HEADER_LENGTH, - type, wire_version, ssl->s3->write_sequence, in, - in_len) || - !ssl3_record_sequence_update(ssl->s3->write_sequence, 8)) { - return 0; - } - - if (ciphertext_len >= 1 << 16) { - OPENSSL_PUT_ERROR(SSL, ERR_R_OVERFLOW); - return 0; - } - out[3] = ciphertext_len >> 8; - out[4] = ciphertext_len & 0xff; - - *out_len = SSL3_RT_HEADER_LENGTH + ciphertext_len; - - if (ssl->msg_callback) { - ssl->msg_callback(1 /* write */, 0, SSL3_RT_HEADER, out, - SSL3_RT_HEADER_LENGTH, ssl, ssl->msg_callback_arg); - } - - return 1; -} - -int tls_seal_record(SSL *ssl, uint8_t *out, size_t *out_len, size_t max_out, - uint8_t type, const uint8_t *in, size_t in_len) { - size_t frag_len = 0; - if (ssl->s3->need_record_splitting && type == SSL3_RT_APPLICATION_DATA && - in_len > 1) { - /* |do_seal_record| will notice if it clobbers |in[0]|, but not if it - * aliases the rest of |in|. */ - if (in + 1 <= out && out < in + in_len) { - OPENSSL_PUT_ERROR(SSL, SSL_R_OUTPUT_ALIASES_INPUT); - return 0; - } - /* Ensure |do_seal_record| does not write beyond |in[0]|. */ - size_t frag_max_out = max_out; - if (out <= in + 1 && in + 1 < out + frag_max_out) { - frag_max_out = (size_t)(in + 1 - out); - } - if (!do_seal_record(ssl, out, &frag_len, frag_max_out, type, in, 1)) { - return 0; - } - in++; - in_len--; - out += frag_len; - max_out -= frag_len; - - assert(SSL3_RT_HEADER_LENGTH + - ssl_cipher_get_record_split_len(ssl->aead_write_ctx->cipher) == - frag_len); - } - - if (!do_seal_record(ssl, out, out_len, max_out, type, in, in_len)) { - return 0; - } - *out_len += frag_len; - return 1; -} |