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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: get_mic.c,v 1.11 2000/01/25 23:19:22 assar Exp $");
OM_uint32 gss_get_mic
(OM_uint32 * minor_status,
const gss_ctx_id_t context_handle,
gss_qop_t qop_req,
const gss_buffer_t message_buffer,
gss_buffer_t message_token
)
{
u_char *p;
MD5_CTX md5;
u_char hash[16];
des_key_schedule schedule;
des_cblock key;
des_cblock zero;
int32_t seq_number;
size_t len, total_len;
gssapi_krb5_encap_length (22, &len, &total_len);
message_token->length = total_len;
message_token->value = malloc (total_len);
if (message_token->value == NULL)
return GSS_S_FAILURE;
p = gssapi_krb5_make_header(message_token->value,
len,
"\x01\x01");
memcpy (p, "\x00\x00", 2);
p += 2;
memcpy (p, "\xff\xff\xff\xff", 4);
p += 4;
/* Fill in later */
memset (p, 0, 16);
p += 16;
/* checksum */
MD5Init (&md5);
MD5Update (&md5, p - 24, 8);
MD5Update (&md5, message_buffer->value,
message_buffer->length);
MD5Final (hash, &md5);
memset (&zero, 0, sizeof(zero));
gss_krb5_getsomekey(context_handle, &key);
des_set_key (&key, schedule);
des_cbc_cksum ((const void *)hash, (void *)hash, sizeof(hash),
schedule, &zero);
memcpy (p - 8, hash, 8);
/* sequence number */
krb5_auth_getlocalseqnumber (gssapi_krb5_context,
context_handle->auth_context,
&seq_number);
p -= 16;
p[0] = (seq_number >> 0) & 0xFF;
p[1] = (seq_number >> 8) & 0xFF;
p[2] = (seq_number >> 16) & 0xFF;
p[3] = (seq_number >> 24) & 0xFF;
memset (p + 4,
(context_handle->more_flags & LOCAL) ? 0 : 0xFF,
4);
des_set_key (&key, schedule);
des_cbc_encrypt ((const void *)p, (void *)p, 8,
schedule, (des_cblock *)(p + 8), DES_ENCRYPT);
krb5_auth_setlocalseqnumber (gssapi_krb5_context,
context_handle->auth_context,
++seq_number);
memset (key, 0, sizeof(key));
memset (schedule, 0, sizeof(schedule));
return GSS_S_COMPLETE;
}
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