freebsd-nq/crypto/heimdal/lib/krb5/rd_cred.c
2001-02-13 16:46:19 +00:00

258 lines
6.7 KiB
C

/*
* Copyright (c) 1997 - 2001 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 <krb5_locl.h>
RCSID("$Id: rd_cred.c,v 1.12 2001/01/04 16:19:00 joda Exp $");
krb5_error_code
krb5_rd_cred(krb5_context context,
krb5_auth_context auth_context,
krb5_data *in_data,
krb5_creds ***ret_creds,
krb5_replay_data *out_data)
{
krb5_error_code ret;
size_t len;
KRB_CRED cred;
EncKrbCredPart enc_krb_cred_part;
krb5_data enc_krb_cred_part_data;
krb5_crypto crypto;
int i;
ret = decode_KRB_CRED(in_data->data, in_data->length,
&cred, &len);
if(ret)
return ret;
if (cred.pvno != 5) {
ret = KRB5KRB_AP_ERR_BADVERSION;
goto out;
}
if (cred.msg_type != krb_cred) {
ret = KRB5KRB_AP_ERR_MSG_TYPE;
goto out;
}
if (cred.enc_part.etype == ETYPE_NULL) {
/* DK: MIT GSS-API Compatibility */
enc_krb_cred_part_data.length = cred.enc_part.cipher.length;
enc_krb_cred_part_data.data = cred.enc_part.cipher.data;
} else {
if (auth_context->remote_subkey)
ret = krb5_crypto_init(context, auth_context->remote_subkey,
0, &crypto);
else
ret = krb5_crypto_init(context, auth_context->keyblock,
0, &crypto);
/* DK: MIT rsh */
if (ret)
goto out;
ret = krb5_decrypt_EncryptedData(context,
crypto,
KRB5_KU_KRB_CRED,
&cred.enc_part,
&enc_krb_cred_part_data);
krb5_crypto_destroy(context, crypto);
if (ret)
goto out;
}
ret = krb5_decode_EncKrbCredPart (context,
enc_krb_cred_part_data.data,
enc_krb_cred_part_data.length,
&enc_krb_cred_part,
&len);
if (ret)
goto out;
/* check sender address */
if (enc_krb_cred_part.s_address
&& auth_context->remote_address
&& auth_context->remote_port) {
krb5_address *a;
int cmp;
ret = krb5_make_addrport (&a,
auth_context->remote_address,
auth_context->remote_port);
if (ret)
goto out;
cmp = krb5_address_compare (context,
a,
enc_krb_cred_part.s_address);
krb5_free_address (context, a);
free (a);
if (cmp == 0) {
ret = KRB5KRB_AP_ERR_BADADDR;
goto out;
}
}
/* check receiver address */
if (enc_krb_cred_part.r_address
&& auth_context->local_address
&& !krb5_address_compare (context,
auth_context->local_address,
enc_krb_cred_part.r_address)) {
ret = KRB5KRB_AP_ERR_BADADDR;
goto out;
}
/* check timestamp */
if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_TIME) {
krb5_timestamp sec;
krb5_timeofday (context, &sec);
if (enc_krb_cred_part.timestamp == NULL ||
enc_krb_cred_part.usec == NULL ||
abs(*enc_krb_cred_part.timestamp - sec)
> context->max_skew) {
ret = KRB5KRB_AP_ERR_SKEW;
goto out;
}
}
if(out_data != NULL) {
if(enc_krb_cred_part.timestamp)
out_data->timestamp = *enc_krb_cred_part.timestamp;
else
out_data->timestamp = 0;
if(enc_krb_cred_part.usec)
out_data->usec = *enc_krb_cred_part.usec;
else
out_data->usec = 0;
if(enc_krb_cred_part.nonce)
out_data->seq = *enc_krb_cred_part.nonce;
else
out_data->seq = 0;
}
/* Convert to NULL terminated list of creds */
*ret_creds = calloc(enc_krb_cred_part.ticket_info.len + 1,
sizeof(**ret_creds));
for (i = 0; i < enc_krb_cred_part.ticket_info.len; ++i) {
KrbCredInfo *kci = &enc_krb_cred_part.ticket_info.val[i];
krb5_creds *creds;
u_char buf[1024];
size_t len;
creds = calloc(1, sizeof(*creds));
if(creds == NULL) {
ret = ENOMEM;
goto out;
}
ret = encode_Ticket (buf + sizeof(buf) - 1, sizeof(buf),
&cred.tickets.val[i],
&len);
if (ret)
goto out;
krb5_data_copy (&creds->ticket, buf + sizeof(buf) - len, len);
copy_EncryptionKey (&kci->key, &creds->session);
if (kci->prealm && kci->pname)
principalname2krb5_principal (&creds->client,
*kci->pname,
*kci->prealm);
if (kci->flags)
creds->flags.b = *kci->flags;
if (kci->authtime)
creds->times.authtime = *kci->authtime;
if (kci->starttime)
creds->times.starttime = *kci->starttime;
if (kci->endtime)
creds->times.endtime = *kci->endtime;
if (kci->renew_till)
creds->times.renew_till = *kci->renew_till;
if (kci->srealm && kci->sname)
principalname2krb5_principal (&creds->server,
*kci->sname,
*kci->srealm);
if (kci->caddr)
krb5_copy_addresses (context,
kci->caddr,
&creds->addresses);
(*ret_creds)[i] = creds;
}
(*ret_creds)[i] = NULL;
return 0;
out:
free_KRB_CRED (&cred);
if(*ret_creds) {
for(i = 0; (*ret_creds)[i]; i++)
krb5_free_creds(context, (*ret_creds)[i]);
free(*ret_creds);
}
return ret;
}
krb5_error_code
krb5_rd_cred2 (krb5_context context,
krb5_auth_context auth_context,
krb5_ccache ccache,
krb5_data *in_data)
{
krb5_error_code ret;
krb5_creds **creds;
int i;
ret = krb5_rd_cred(context, auth_context, in_data, &creds, NULL);
if(ret)
return ret;
/* Store the creds in the ccache */
for(i = 0; creds && creds[i]; i++) {
krb5_cc_store_cred(context, ccache, creds[i]);
krb5_free_creds(context, creds[i]);
}
free(creds);
return 0;
}