258 lines
9.1 KiB
C
258 lines
9.1 KiB
C
|
/*
|
||
|
|
* DTLS implementation written by Nagendra Modadugu
|
||
|
|
* (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
|
||
|
|
*/
|
||
|
|
/* ====================================================================
|
||
|
|
* Copyright (c) 1998-2005 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 (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.] */
|
||
|
|
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <assert.h>
|
||
|
|
|
||
|
|
#include <openssl/comp.h>
|
||
|
|
#include <openssl/evp.h>
|
||
|
|
#include <openssl/hmac.h>
|
||
|
|
#include <openssl/md5.h>
|
||
|
|
#include <openssl/rand.h>
|
||
|
|
|
||
|
|
#include "ssl_locl.h"
|
||
|
|
|
||
|
|
|
||
|
|
/* dtls1_enc encrypts/decrypts the record in |s->wrec| / |s->rrec|, respectively.
|
||
|
|
*
|
||
|
|
* Returns:
|
||
|
|
* 0: (in non-constant time) if the record is publically invalid (i.e. too
|
||
|
|
* short etc).
|
||
|
|
* 1: if the record's padding is valid / the encryption was successful.
|
||
|
|
* -1: if the record's padding/AEAD-authenticator is invalid or, if sending,
|
||
|
|
* an internal error occured. */
|
||
|
|
int dtls1_enc(SSL *s, int send)
|
||
|
|
{
|
||
|
|
SSL3_RECORD *rec;
|
||
|
|
EVP_CIPHER_CTX *ds;
|
||
|
|
unsigned long l;
|
||
|
|
int bs,i,j,k,mac_size=0;
|
||
|
|
const EVP_CIPHER *enc;
|
||
|
|
|
||
|
|
if (send)
|
||
|
|
{
|
||
|
|
if (EVP_MD_CTX_md(s->write_hash))
|
||
|
|
{
|
||
|
|
mac_size=EVP_MD_CTX_size(s->write_hash);
|
||
|
|
if (mac_size < 0)
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
ds=s->enc_write_ctx;
|
||
|
|
rec= &(s->s3->wrec);
|
||
|
|
if (s->enc_write_ctx == NULL)
|
||
|
|
enc=NULL;
|
||
|
|
else
|
||
|
|
{
|
||
|
|
enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
|
||
|
|
if ( rec->data != rec->input)
|
||
|
|
/* we can't write into the input stream */
|
||
|
|
fprintf(stderr, "%s:%d: rec->data != rec->input\n",
|
||
|
|
__FILE__, __LINE__);
|
||
|
|
else if ( EVP_CIPHER_block_size(ds->cipher) > 1)
|
||
|
|
{
|
||
|
|
if (RAND_bytes(rec->input, EVP_CIPHER_block_size(ds->cipher)) <= 0)
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
if (EVP_MD_CTX_md(s->read_hash))
|
||
|
|
{
|
||
|
|
mac_size=EVP_MD_CTX_size(s->read_hash);
|
||
|
|
assert(mac_size >= 0);
|
||
|
|
}
|
||
|
|
ds=s->enc_read_ctx;
|
||
|
|
rec= &(s->s3->rrec);
|
||
|
|
if (s->enc_read_ctx == NULL)
|
||
|
|
enc=NULL;
|
||
|
|
else
|
||
|
|
enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
|
||
|
|
}
|
||
|
|
|
||
|
|
#ifdef KSSL_DEBUG
|
||
|
|
printf("dtls1_enc(%d)\n", send);
|
||
|
|
#endif /* KSSL_DEBUG */
|
||
|
|
|
||
|
|
if ((s->session == NULL) || (ds == NULL) ||
|
||
|
|
(enc == NULL))
|
||
|
|
{
|
||
|
|
memmove(rec->data,rec->input,rec->length);
|
||
|
|
rec->input=rec->data;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
l=rec->length;
|
||
|
|
bs=EVP_CIPHER_block_size(ds->cipher);
|
||
|
|
|
||
|
|
if ((bs != 1) && send)
|
||
|
|
{
|
||
|
|
i=bs-((int)l%bs);
|
||
|
|
|
||
|
|
/* Add weird padding of upto 256 bytes */
|
||
|
|
|
||
|
|
/* we need to add 'i' padding bytes of value j */
|
||
|
|
j=i-1;
|
||
|
|
if (s->options & SSL_OP_TLS_BLOCK_PADDING_BUG)
|
||
|
|
{
|
||
|
|
if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG)
|
||
|
|
j++;
|
||
|
|
}
|
||
|
|
for (k=(int)l; k<(int)(l+i); k++)
|
||
|
|
rec->input[k]=j;
|
||
|
|
l+=i;
|
||
|
|
rec->length+=i;
|
||
|
|
}
|
||
|
|
|
||
|
|
#ifdef KSSL_DEBUG
|
||
|
|
{
|
||
|
|
unsigned long ui;
|
||
|
|
printf("EVP_Cipher(ds=%p,rec->data=%p,rec->input=%p,l=%ld) ==>\n",
|
||
|
|
ds,rec->data,rec->input,l);
|
||
|
|
printf("\tEVP_CIPHER_CTX: %d buf_len, %d key_len [%d %d], %d iv_len\n",
|
||
|
|
ds->buf_len, ds->cipher->key_len,
|
||
|
|
DES_KEY_SZ, DES_SCHEDULE_SZ,
|
||
|
|
ds->cipher->iv_len);
|
||
|
|
printf("\t\tIV: ");
|
||
|
|
for (i=0; i<ds->cipher->iv_len; i++) printf("%02X", ds->iv[i]);
|
||
|
|
printf("\n");
|
||
|
|
printf("\trec->input=");
|
||
|
|
for (ui=0; ui<l; ui++) printf(" %02x", rec->input[ui]);
|
||
|
|
printf("\n");
|
||
|
|
}
|
||
|
|
#endif /* KSSL_DEBUG */
|
||
|
|
|
||
|
|
if (!send)
|
||
|
|
{
|
||
|
|
if (l == 0 || l%bs != 0)
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
EVP_Cipher(ds,rec->data,rec->input,l);
|
||
|
|
|
||
|
|
#ifdef KSSL_DEBUG
|
||
|
|
{
|
||
|
|
unsigned long i;
|
||
|
|
printf("\trec->data=");
|
||
|
|
for (i=0; i<l; i++)
|
||
|
|
printf(" %02x", rec->data[i]); printf("\n");
|
||
|
|
}
|
||
|
|
#endif /* KSSL_DEBUG */
|
||
|
|
|
||
|
|
if ((bs != 1) && !send)
|
||
|
|
return tls1_cbc_remove_padding(s, rec, bs, mac_size);
|
||
|
|
}
|
||
|
|
return(1);
|
||
|
|
}
|
||
|
|
|