283 lines
9.7 KiB
C
283 lines
9.7 KiB
C
/* ssl/d1_enc.c */
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/*
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* DTLS implementation written by Nagendra Modadugu
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* (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
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*/
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/* ====================================================================
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* Copyright (c) 1998-2005 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* openssl-core@openssl.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com).
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*
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*/
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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#include <stdio.h>
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#include "ssl_locl.h"
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#ifndef OPENSSL_NO_COMP
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#include <openssl/comp.h>
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#endif
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#include <openssl/evp.h>
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#include <openssl/hmac.h>
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#include <openssl/md5.h>
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#include <openssl/rand.h>
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#ifdef KSSL_DEBUG
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#include <openssl/des.h>
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#endif
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int dtls1_enc(SSL *s, int send)
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{
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SSL3_RECORD *rec;
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EVP_CIPHER_CTX *ds;
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unsigned long l;
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int bs,i,ii,j,k;
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const EVP_CIPHER *enc;
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if (send)
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{
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ds=s->enc_write_ctx;
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rec= &(s->s3->wrec);
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if (s->enc_write_ctx == NULL)
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enc=NULL;
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else
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{
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enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
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if ( rec->data != rec->input)
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/* we can't write into the input stream */
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fprintf(stderr, "%s:%d: rec->data != rec->input\n",
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__FILE__, __LINE__);
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else if ( EVP_CIPHER_block_size(ds->cipher) > 1)
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{
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if (RAND_bytes(rec->input, EVP_CIPHER_block_size(ds->cipher)) <= 0)
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return -1;
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}
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}
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}
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else
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{
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ds=s->enc_read_ctx;
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rec= &(s->s3->rrec);
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if (s->enc_read_ctx == NULL)
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enc=NULL;
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else
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enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
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}
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#ifdef KSSL_DEBUG
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printf("dtls1_enc(%d)\n", send);
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#endif /* KSSL_DEBUG */
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if ((s->session == NULL) || (ds == NULL) ||
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(enc == NULL))
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{
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memmove(rec->data,rec->input,rec->length);
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rec->input=rec->data;
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}
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else
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{
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l=rec->length;
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bs=EVP_CIPHER_block_size(ds->cipher);
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if ((bs != 1) && send)
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{
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i=bs-((int)l%bs);
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/* Add weird padding of upto 256 bytes */
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/* we need to add 'i' padding bytes of value j */
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j=i-1;
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if (s->options & SSL_OP_TLS_BLOCK_PADDING_BUG)
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{
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if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG)
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j++;
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}
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for (k=(int)l; k<(int)(l+i); k++)
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rec->input[k]=j;
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l+=i;
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rec->length+=i;
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}
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#ifdef KSSL_DEBUG
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{
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unsigned long ui;
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printf("EVP_Cipher(ds=%p,rec->data=%p,rec->input=%p,l=%ld) ==>\n",
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(void *)ds,rec->data,rec->input,l);
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printf("\tEVP_CIPHER_CTX: %d buf_len, %d key_len [%ld %ld], %d iv_len\n",
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ds->buf_len, ds->cipher->key_len,
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(unsigned long)DES_KEY_SZ,
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(unsigned long)DES_SCHEDULE_SZ,
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ds->cipher->iv_len);
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printf("\t\tIV: ");
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for (i=0; i<ds->cipher->iv_len; i++) printf("%02X", ds->iv[i]);
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printf("\n");
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printf("\trec->input=");
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for (ui=0; ui<l; ui++) printf(" %02x", rec->input[ui]);
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printf("\n");
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}
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#endif /* KSSL_DEBUG */
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if (!send)
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{
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if (l == 0 || l%bs != 0)
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{
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SSLerr(SSL_F_DTLS1_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
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ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED);
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return 0;
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}
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}
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EVP_Cipher(ds,rec->data,rec->input,l);
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#ifdef KSSL_DEBUG
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{
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unsigned long ki;
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printf("\trec->data=");
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for (ki=0; ki<l; ki++)
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printf(" %02x", rec->data[ki]); printf("\n");
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}
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#endif /* KSSL_DEBUG */
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if ((bs != 1) && !send)
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{
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ii=i=rec->data[l-1]; /* padding_length */
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i++;
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if (s->options&SSL_OP_TLS_BLOCK_PADDING_BUG)
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{
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/* First packet is even in size, so check */
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if ((memcmp(s->s3->read_sequence,
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"\0\0\0\0\0\0\0\0",8) == 0) && !(ii & 1))
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s->s3->flags|=TLS1_FLAGS_TLS_PADDING_BUG;
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if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG)
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i--;
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}
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/* TLS 1.0 does not bound the number of padding bytes by the block size.
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* All of them must have value 'padding_length'. */
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if (i > (int)rec->length)
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{
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/* Incorrect padding. SSLerr() and ssl3_alert are done
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* by caller: we don't want to reveal whether this is
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* a decryption error or a MAC verification failure
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* (see http://www.openssl.org/~bodo/tls-cbc.txt)
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*/
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return -1;
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}
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for (j=(int)(l-i); j<(int)l; j++)
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{
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if (rec->data[j] != ii)
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{
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/* Incorrect padding */
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return -1;
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}
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}
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rec->length-=i;
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rec->data += bs; /* skip the implicit IV */
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rec->input += bs;
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rec->length -= bs;
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}
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}
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return(1);
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}
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