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/*
* Copyright (c) 1997 - 2000 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* 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. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``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 INSTITUTE 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.
*/
#include "gssapi_locl.h"
RCSID("$Id: 8003.c,v 1.6 2000/01/25 23:10:13 assar Exp $");
static krb5_error_code
encode_om_uint32(OM_uint32 n, u_char *p)
{
p[0] = (n >> 0) & 0xFF;
p[1] = (n >> 8) & 0xFF;
p[2] = (n >> 16) & 0xFF;
p[3] = (n >> 24) & 0xFF;
return 0;
}
static krb5_error_code
decode_om_uint32(u_char *p, OM_uint32 *n)
{
*n = (p[0] << 0) | (p[1] << 8) | (p[2] << 16) | (p[3] << 24);
return 0;
}
static krb5_error_code
hash_input_chan_bindings (const gss_channel_bindings_t b,
u_char *p)
{
u_char num[4];
MD5_CTX md5;
MD5Init(&md5);
encode_om_uint32 (b->initiator_addrtype, num);
MD5Update (&md5, num, sizeof(num));
encode_om_uint32 (b->initiator_address.length, num);
MD5Update (&md5, num, sizeof(num));
if (b->initiator_address.length)
MD5Update (&md5,
b->initiator_address.value,
b->initiator_address.length);
encode_om_uint32 (b->acceptor_addrtype, num);
MD5Update (&md5, num, sizeof(num));
encode_om_uint32 (b->acceptor_address.length, num);
MD5Update (&md5, num, sizeof(num));
if (b->acceptor_address.length)
MD5Update (&md5,
b->acceptor_address.value,
b->acceptor_address.length);
encode_om_uint32 (b->application_data.length, num);
MD5Update (&md5, num, sizeof(num));
if (b->application_data.length)
MD5Update (&md5,
b->application_data.value,
b->application_data.length);
MD5Final (p, &md5);
return 0;
}
krb5_error_code
gssapi_krb5_create_8003_checksum (
const gss_channel_bindings_t input_chan_bindings,
OM_uint32 flags,
Checksum *result)
{
u_char *p;
result->cksumtype = 0x8003;
result->checksum.length = 24;
result->checksum.data = malloc (result->checksum.length);
if (result->checksum.data == NULL)
return ENOMEM;
p = result->checksum.data;
encode_om_uint32 (16, p);
p += 4;
if (input_chan_bindings == GSS_C_NO_CHANNEL_BINDINGS) {
memset (p, 0, 16);
} else {
hash_input_chan_bindings (input_chan_bindings, p);
}
p += 16;
encode_om_uint32 (flags, p);
p += 4;
if (p - (u_char *)result->checksum.data != result->checksum.length)
abort ();
return 0;
}
krb5_error_code
gssapi_krb5_verify_8003_checksum(
const gss_channel_bindings_t input_chan_bindings,
Checksum *cksum,
OM_uint32 *flags)
{
unsigned char hash[16];
unsigned char *p;
OM_uint32 length;
/* XXX should handle checksums > 24 bytes */
if(cksum->cksumtype != 0x8003 || cksum->checksum.length != 24)
return GSS_S_BAD_BINDINGS;
p = cksum->checksum.data;
decode_om_uint32(p, &length);
if(length != sizeof(hash))
return GSS_S_FAILURE;
p += 4;
if (input_chan_bindings != GSS_C_NO_CHANNEL_BINDINGS) {
if(hash_input_chan_bindings(input_chan_bindings, hash) != 0)
return GSS_S_FAILURE;
if(memcmp(hash, p, sizeof(hash)) != 0)
return GSS_S_FAILURE;
}
p += sizeof(hash);
decode_om_uint32(p, flags);
return 0;
}
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