OpenBSD-4.6/kerberosV/src/lib/gssapi/get_mic.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("$KTH: get_mic.c,v 1.29 2005/01/05 02:52:12 lukeh 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, GSS_KRB5_MECHANISM);
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 */
GSS_KRB5_MECHANISM);
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 */
HEIMDAL_MUTEX_lock(&context_handle->ctx_id_mutex);
/* 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);
HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex);
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, GSS_KRB5_MECHANISM);
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 */
GSS_KRB5_MECHANISM);
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);
HEIMDAL_MUTEX_lock(&context_handle->ctx_id_mutex);
/* 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);
HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex);
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_subkey(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;
case KEYTYPE_ARCFOUR:
case KEYTYPE_ARCFOUR_56:
ret = _gssapi_get_mic_arcfour (minor_status, context_handle, qop_req,
message_buffer, message_token, key);
break;
default :
ret = _gssapi_mic_cfx (minor_status, context_handle, qop_req,
message_buffer, message_token, key);
break;
}
krb5_free_keyblock (gssapi_krb5_context, key);
return ret;
}