292 lines
8.0 KiB
C
292 lines
8.0 KiB
C
/*
|
|
* Copyright (c) 1997 - 2003 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 1.21 2003/03/16 18:02:04 lha Exp $");
|
|
|
|
static OM_uint32
|
|
mic_des
|
|
(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,
|
|
krb5_keyblock *key
|
|
)
|
|
{
|
|
u_char *p;
|
|
MD5_CTX md5;
|
|
u_char hash[16];
|
|
des_key_schedule schedule;
|
|
des_cblock deskey;
|
|
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) {
|
|
*minor_status = ENOMEM;
|
|
return GSS_S_FAILURE;
|
|
}
|
|
|
|
p = gssapi_krb5_make_header(message_token->value,
|
|
len,
|
|
"\x01\x01"); /* TOK_ID */
|
|
|
|
memcpy (p, "\x00\x00", 2); /* SGN_ALG = DES MAC MD5 */
|
|
p += 2;
|
|
|
|
memcpy (p, "\xff\xff\xff\xff", 4); /* Filler */
|
|
p += 4;
|
|
|
|
/* Fill in later (SND-SEQ) */
|
|
memset (p, 0, 16);
|
|
p += 16;
|
|
|
|
/* checksum */
|
|
MD5_Init (&md5);
|
|
MD5_Update (&md5, p - 24, 8);
|
|
MD5_Update (&md5, message_buffer->value, message_buffer->length);
|
|
MD5_Final (hash, &md5);
|
|
|
|
memset (&zero, 0, sizeof(zero));
|
|
memcpy (&deskey, key->keyvalue.data, sizeof(deskey));
|
|
des_set_key (&deskey, schedule);
|
|
des_cbc_cksum ((void *)hash, (void *)hash, sizeof(hash),
|
|
schedule, &zero);
|
|
memcpy (p - 8, hash, 8); /* SGN_CKSUM */
|
|
|
|
/* sequence number */
|
|
krb5_auth_con_getlocalseqnumber (gssapi_krb5_context,
|
|
context_handle->auth_context,
|
|
&seq_number);
|
|
|
|
p -= 16; /* SND_SEQ */
|
|
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 (&deskey, schedule);
|
|
des_cbc_encrypt ((void *)p, (void *)p, 8,
|
|
schedule, (des_cblock *)(p + 8), DES_ENCRYPT);
|
|
|
|
krb5_auth_con_setlocalseqnumber (gssapi_krb5_context,
|
|
context_handle->auth_context,
|
|
++seq_number);
|
|
|
|
memset (deskey, 0, sizeof(deskey));
|
|
memset (schedule, 0, sizeof(schedule));
|
|
|
|
*minor_status = 0;
|
|
return GSS_S_COMPLETE;
|
|
}
|
|
|
|
static OM_uint32
|
|
mic_des3
|
|
(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,
|
|
krb5_keyblock *key
|
|
)
|
|
{
|
|
u_char *p;
|
|
Checksum cksum;
|
|
u_char seq[8];
|
|
|
|
int32_t seq_number;
|
|
size_t len, total_len;
|
|
|
|
krb5_crypto crypto;
|
|
krb5_error_code kret;
|
|
krb5_data encdata;
|
|
char *tmp;
|
|
char ivec[8];
|
|
|
|
gssapi_krb5_encap_length (36, &len, &total_len);
|
|
|
|
message_token->length = total_len;
|
|
message_token->value = malloc (total_len);
|
|
if (message_token->value == NULL) {
|
|
*minor_status = ENOMEM;
|
|
return GSS_S_FAILURE;
|
|
}
|
|
|
|
p = gssapi_krb5_make_header(message_token->value,
|
|
len,
|
|
"\x01\x01"); /* TOK-ID */
|
|
|
|
memcpy (p, "\x04\x00", 2); /* SGN_ALG = HMAC SHA1 DES3-KD */
|
|
p += 2;
|
|
|
|
memcpy (p, "\xff\xff\xff\xff", 4); /* filler */
|
|
p += 4;
|
|
|
|
/* this should be done in parts */
|
|
|
|
tmp = malloc (message_buffer->length + 8);
|
|
if (tmp == NULL) {
|
|
free (message_token->value);
|
|
*minor_status = ENOMEM;
|
|
return GSS_S_FAILURE;
|
|
}
|
|
memcpy (tmp, p - 8, 8);
|
|
memcpy (tmp + 8, message_buffer->value, message_buffer->length);
|
|
|
|
kret = krb5_crypto_init(gssapi_krb5_context, key, 0, &crypto);
|
|
if (kret) {
|
|
free (message_token->value);
|
|
free (tmp);
|
|
gssapi_krb5_set_error_string ();
|
|
*minor_status = kret;
|
|
return GSS_S_FAILURE;
|
|
}
|
|
|
|
kret = krb5_create_checksum (gssapi_krb5_context,
|
|
crypto,
|
|
KRB5_KU_USAGE_SIGN,
|
|
0,
|
|
tmp,
|
|
message_buffer->length + 8,
|
|
&cksum);
|
|
free (tmp);
|
|
krb5_crypto_destroy (gssapi_krb5_context, crypto);
|
|
if (kret) {
|
|
free (message_token->value);
|
|
gssapi_krb5_set_error_string ();
|
|
*minor_status = kret;
|
|
return GSS_S_FAILURE;
|
|
}
|
|
|
|
memcpy (p + 8, cksum.checksum.data, cksum.checksum.length);
|
|
|
|
/* sequence number */
|
|
krb5_auth_con_getlocalseqnumber (gssapi_krb5_context,
|
|
context_handle->auth_context,
|
|
&seq_number);
|
|
|
|
seq[0] = (seq_number >> 0) & 0xFF;
|
|
seq[1] = (seq_number >> 8) & 0xFF;
|
|
seq[2] = (seq_number >> 16) & 0xFF;
|
|
seq[3] = (seq_number >> 24) & 0xFF;
|
|
memset (seq + 4,
|
|
(context_handle->more_flags & LOCAL) ? 0 : 0xFF,
|
|
4);
|
|
|
|
kret = krb5_crypto_init(gssapi_krb5_context, key,
|
|
ETYPE_DES3_CBC_NONE, &crypto);
|
|
if (kret) {
|
|
free (message_token->value);
|
|
gssapi_krb5_set_error_string ();
|
|
*minor_status = kret;
|
|
return GSS_S_FAILURE;
|
|
}
|
|
|
|
if (context_handle->more_flags & COMPAT_OLD_DES3)
|
|
memset(ivec, 0, 8);
|
|
else
|
|
memcpy(ivec, p + 8, 8);
|
|
|
|
kret = krb5_encrypt_ivec (gssapi_krb5_context,
|
|
crypto,
|
|
KRB5_KU_USAGE_SEQ,
|
|
seq, 8, &encdata, ivec);
|
|
krb5_crypto_destroy (gssapi_krb5_context, crypto);
|
|
if (kret) {
|
|
free (message_token->value);
|
|
gssapi_krb5_set_error_string ();
|
|
*minor_status = kret;
|
|
return GSS_S_FAILURE;
|
|
}
|
|
|
|
assert (encdata.length == 8);
|
|
|
|
memcpy (p, encdata.data, encdata.length);
|
|
krb5_data_free (&encdata);
|
|
|
|
krb5_auth_con_setlocalseqnumber (gssapi_krb5_context,
|
|
context_handle->auth_context,
|
|
++seq_number);
|
|
|
|
free_Checksum (&cksum);
|
|
*minor_status = 0;
|
|
return GSS_S_COMPLETE;
|
|
}
|
|
|
|
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
|
|
)
|
|
{
|
|
krb5_keyblock *key;
|
|
OM_uint32 ret;
|
|
krb5_keytype keytype;
|
|
|
|
ret = gss_krb5_get_localkey(context_handle, &key);
|
|
if (ret) {
|
|
gssapi_krb5_set_error_string ();
|
|
*minor_status = ret;
|
|
return GSS_S_FAILURE;
|
|
}
|
|
krb5_enctype_to_keytype (gssapi_krb5_context, key->keytype, &keytype);
|
|
|
|
switch (keytype) {
|
|
case KEYTYPE_DES :
|
|
ret = mic_des (minor_status, context_handle, qop_req,
|
|
message_buffer, message_token, key);
|
|
break;
|
|
case KEYTYPE_DES3 :
|
|
ret = mic_des3 (minor_status, context_handle, qop_req,
|
|
message_buffer, message_token, key);
|
|
break;
|
|
default :
|
|
*minor_status = KRB5_PROG_ETYPE_NOSUPP;
|
|
ret = GSS_S_FAILURE;
|
|
break;
|
|
}
|
|
krb5_free_keyblock (gssapi_krb5_context, key);
|
|
return ret;
|
|
}
|