/* Copyright (C) 1995-1998 Eric Young ([email protected]) * All rights reserved. * * This package is an SSL implementation written * by Eric Young ([email protected]). * 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 ([email protected]). * * 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 ([email protected])" * 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 ([email protected])" * * 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 * [email protected]. * * 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 * ([email protected]). This product includes software written by Tim * Hudson ([email protected]). */ #include <openssl/ssl.h> #include <assert.h> #include <string.h> #include <openssl/bytestring.h> #include <openssl/err.h> #include <openssl/mem.h> #include "internal.h" #include "../crypto/internal.h" BSSL_NAMESPACE_BEGIN // 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 = …; // kMaxEarlyDataSkipped is the maximum number of rejected early data bytes that // will be skipped. Without this limit an attacker could send records at a // faster rate than we can process and cause trial decryption to loop forever. // This value should be slightly above kMaxEarlyDataAccepted, which is measured // in plaintext. static const size_t kMaxEarlyDataSkipped = …; // kMaxWarningAlerts is the number of consecutive warning alerts that will be // processed. static const uint8_t kMaxWarningAlerts = …; // ssl_needs_record_splitting returns one if |ssl|'s current outgoing cipher // state needs record-splitting and zero otherwise. bool ssl_needs_record_splitting(const SSL *ssl) { … } size_t ssl_record_prefix_len(const SSL *ssl) { … } static ssl_open_record_t skip_early_data(SSL *ssl, uint8_t *out_alert, size_t consumed) { … } ssl_open_record_t tls_open_record(SSL *ssl, uint8_t *out_type, Span<uint8_t> *out, size_t *out_consumed, uint8_t *out_alert, Span<uint8_t> in) { … } static bool do_seal_record(SSL *ssl, uint8_t *out_prefix, uint8_t *out, uint8_t *out_suffix, uint8_t type, const uint8_t *in, const size_t in_len) { … } static size_t tls_seal_scatter_prefix_len(const SSL *ssl, uint8_t type, size_t in_len) { … } static bool tls_seal_scatter_suffix_len(const SSL *ssl, size_t *out_suffix_len, uint8_t type, size_t in_len) { … } // tls_seal_scatter_record seals a new record of type |type| and body |in| and // splits it between |out_prefix|, |out|, and |out_suffix|. Exactly // |tls_seal_scatter_prefix_len| bytes are written to |out_prefix|, |in_len| // bytes to |out|, and |tls_seal_scatter_suffix_len| bytes to |out_suffix|. It // returns one on success and zero on error. If enabled, // |tls_seal_scatter_record| implements TLS 1.0 CBC 1/n-1 record splitting and // may write two records concatenated. static bool tls_seal_scatter_record(SSL *ssl, uint8_t *out_prefix, uint8_t *out, uint8_t *out_suffix, uint8_t type, const uint8_t *in, size_t in_len) { … } bool tls_seal_record(SSL *ssl, uint8_t *out, size_t *out_len, size_t max_out_len, uint8_t type, const uint8_t *in, size_t in_len) { … } enum ssl_open_record_t ssl_process_alert(SSL *ssl, uint8_t *out_alert, Span<const uint8_t> in) { … } BSSL_NAMESPACE_END usingnamespacebssl; size_t SSL_max_seal_overhead(const SSL *ssl) { … }
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