523 lines
12 KiB
C
523 lines
12 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_req.c,v 1.47 2001/06/18 02:48:18 assar Exp $");
|
|
|
|
static krb5_error_code
|
|
decrypt_tkt_enc_part (krb5_context context,
|
|
krb5_keyblock *key,
|
|
EncryptedData *enc_part,
|
|
EncTicketPart *decr_part)
|
|
{
|
|
krb5_error_code ret;
|
|
krb5_data plain;
|
|
size_t len;
|
|
krb5_crypto crypto;
|
|
|
|
ret = krb5_crypto_init(context, key, 0, &crypto);
|
|
if (ret)
|
|
return ret;
|
|
ret = krb5_decrypt_EncryptedData (context,
|
|
crypto,
|
|
KRB5_KU_TICKET,
|
|
enc_part,
|
|
&plain);
|
|
krb5_crypto_destroy(context, crypto);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = krb5_decode_EncTicketPart(context, plain.data, plain.length,
|
|
decr_part, &len);
|
|
krb5_data_free (&plain);
|
|
return ret;
|
|
}
|
|
|
|
static krb5_error_code
|
|
decrypt_authenticator (krb5_context context,
|
|
EncryptionKey *key,
|
|
EncryptedData *enc_part,
|
|
Authenticator *authenticator,
|
|
krb5_key_usage usage)
|
|
{
|
|
krb5_error_code ret;
|
|
krb5_data plain;
|
|
size_t len;
|
|
krb5_crypto crypto;
|
|
|
|
ret = krb5_crypto_init(context, key, 0, &crypto);
|
|
if (ret)
|
|
return ret;
|
|
ret = krb5_decrypt_EncryptedData (context,
|
|
crypto,
|
|
usage /* KRB5_KU_AP_REQ_AUTH */,
|
|
enc_part,
|
|
&plain);
|
|
/* for backwards compatibility, also try the old usage */
|
|
if (ret && usage == KRB5_KU_TGS_REQ_AUTH)
|
|
ret = krb5_decrypt_EncryptedData (context,
|
|
crypto,
|
|
KRB5_KU_AP_REQ_AUTH,
|
|
enc_part,
|
|
&plain);
|
|
krb5_crypto_destroy(context, crypto);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = krb5_decode_Authenticator(context, plain.data, plain.length,
|
|
authenticator, &len);
|
|
krb5_data_free (&plain);
|
|
return ret;
|
|
}
|
|
|
|
krb5_error_code
|
|
krb5_decode_ap_req(krb5_context context,
|
|
const krb5_data *inbuf,
|
|
krb5_ap_req *ap_req)
|
|
{
|
|
krb5_error_code ret;
|
|
size_t len;
|
|
ret = decode_AP_REQ(inbuf->data, inbuf->length, ap_req, &len);
|
|
if (ret)
|
|
return ret;
|
|
if (ap_req->pvno != 5){
|
|
free_AP_REQ(ap_req);
|
|
krb5_clear_error_string (context);
|
|
return KRB5KRB_AP_ERR_BADVERSION;
|
|
}
|
|
if (ap_req->msg_type != krb_ap_req){
|
|
free_AP_REQ(ap_req);
|
|
krb5_clear_error_string (context);
|
|
return KRB5KRB_AP_ERR_MSG_TYPE;
|
|
}
|
|
if (ap_req->ticket.tkt_vno != 5){
|
|
free_AP_REQ(ap_req);
|
|
krb5_clear_error_string (context);
|
|
return KRB5KRB_AP_ERR_BADVERSION;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
krb5_error_code
|
|
krb5_decrypt_ticket(krb5_context context,
|
|
Ticket *ticket,
|
|
krb5_keyblock *key,
|
|
EncTicketPart *out,
|
|
krb5_flags flags)
|
|
{
|
|
EncTicketPart t;
|
|
krb5_error_code ret;
|
|
ret = decrypt_tkt_enc_part (context, key, &ticket->enc_part, &t);
|
|
if (ret)
|
|
return ret;
|
|
|
|
{
|
|
krb5_timestamp now;
|
|
time_t start = t.authtime;
|
|
|
|
krb5_timeofday (context, &now);
|
|
if(t.starttime)
|
|
start = *t.starttime;
|
|
if(start - now > context->max_skew
|
|
|| (t.flags.invalid
|
|
&& !(flags & KRB5_VERIFY_AP_REQ_IGNORE_INVALID))) {
|
|
free_EncTicketPart(&t);
|
|
krb5_clear_error_string (context);
|
|
return KRB5KRB_AP_ERR_TKT_NYV;
|
|
}
|
|
if(now - t.endtime > context->max_skew) {
|
|
free_EncTicketPart(&t);
|
|
krb5_clear_error_string (context);
|
|
return KRB5KRB_AP_ERR_TKT_EXPIRED;
|
|
}
|
|
}
|
|
|
|
if(out)
|
|
*out = t;
|
|
else
|
|
free_EncTicketPart(&t);
|
|
return 0;
|
|
}
|
|
|
|
krb5_error_code
|
|
krb5_verify_authenticator_checksum(krb5_context context,
|
|
krb5_auth_context ac,
|
|
void *data,
|
|
size_t len)
|
|
{
|
|
krb5_error_code ret;
|
|
krb5_keyblock *key;
|
|
krb5_authenticator authenticator;
|
|
krb5_crypto crypto;
|
|
|
|
ret = krb5_auth_con_getauthenticator (context,
|
|
ac,
|
|
&authenticator);
|
|
if(ret)
|
|
return ret;
|
|
if(authenticator->cksum == NULL)
|
|
return -17;
|
|
ret = krb5_auth_con_getkey(context, ac, &key);
|
|
if(ret) {
|
|
krb5_free_authenticator(context, &authenticator);
|
|
return ret;
|
|
}
|
|
ret = krb5_crypto_init(context, key, 0, &crypto);
|
|
if(ret)
|
|
goto out;
|
|
ret = krb5_verify_checksum (context,
|
|
crypto,
|
|
KRB5_KU_AP_REQ_AUTH_CKSUM,
|
|
data,
|
|
len,
|
|
authenticator->cksum);
|
|
krb5_crypto_destroy(context, crypto);
|
|
out:
|
|
krb5_free_authenticator(context, &authenticator);
|
|
krb5_free_keyblock(context, key);
|
|
return ret;
|
|
}
|
|
|
|
#if 0
|
|
static krb5_error_code
|
|
check_transited(krb5_context context,
|
|
krb5_ticket *ticket)
|
|
{
|
|
char **realms;
|
|
int num_realms;
|
|
krb5_error_code ret;
|
|
|
|
if(ticket->ticket.transited.tr_type != DOMAIN_X500_COMPRESS)
|
|
return KRB5KDC_ERR_TRTYPE_NOSUPP;
|
|
|
|
ret = krb5_domain_x500_decode(ticket->ticket.transited.contents,
|
|
&realms, &num_realms,
|
|
ticket->client->realm,
|
|
ticket->server->realm);
|
|
if(ret)
|
|
return ret;
|
|
ret = krb5_check_transited_realms(context, realms, num_realms, NULL);
|
|
free(realms);
|
|
return ret;
|
|
}
|
|
#endif
|
|
|
|
krb5_error_code
|
|
krb5_verify_ap_req(krb5_context context,
|
|
krb5_auth_context *auth_context,
|
|
krb5_ap_req *ap_req,
|
|
krb5_const_principal server,
|
|
krb5_keyblock *keyblock,
|
|
krb5_flags flags,
|
|
krb5_flags *ap_req_options,
|
|
krb5_ticket **ticket)
|
|
{
|
|
return krb5_verify_ap_req2 (context,
|
|
auth_context,
|
|
ap_req,
|
|
server,
|
|
keyblock,
|
|
flags,
|
|
ap_req_options,
|
|
ticket,
|
|
KRB5_KU_AP_REQ_AUTH);
|
|
}
|
|
|
|
krb5_error_code
|
|
krb5_verify_ap_req2(krb5_context context,
|
|
krb5_auth_context *auth_context,
|
|
krb5_ap_req *ap_req,
|
|
krb5_const_principal server,
|
|
krb5_keyblock *keyblock,
|
|
krb5_flags flags,
|
|
krb5_flags *ap_req_options,
|
|
krb5_ticket **ticket,
|
|
krb5_key_usage usage)
|
|
{
|
|
krb5_ticket t;
|
|
krb5_auth_context ac;
|
|
krb5_error_code ret;
|
|
|
|
if (auth_context && *auth_context) {
|
|
ac = *auth_context;
|
|
} else {
|
|
ret = krb5_auth_con_init (context, &ac);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
if (ap_req->ap_options.use_session_key && ac->keyblock){
|
|
ret = krb5_decrypt_ticket(context, &ap_req->ticket,
|
|
ac->keyblock,
|
|
&t.ticket,
|
|
flags);
|
|
krb5_free_keyblock(context, ac->keyblock);
|
|
ac->keyblock = NULL;
|
|
}else
|
|
ret = krb5_decrypt_ticket(context, &ap_req->ticket,
|
|
keyblock,
|
|
&t.ticket,
|
|
flags);
|
|
|
|
if(ret)
|
|
goto out;
|
|
|
|
principalname2krb5_principal(&t.server, ap_req->ticket.sname,
|
|
ap_req->ticket.realm);
|
|
principalname2krb5_principal(&t.client, t.ticket.cname,
|
|
t.ticket.crealm);
|
|
|
|
/* save key */
|
|
|
|
krb5_copy_keyblock(context, &t.ticket.key, &ac->keyblock);
|
|
|
|
ret = decrypt_authenticator (context,
|
|
&t.ticket.key,
|
|
&ap_req->authenticator,
|
|
ac->authenticator,
|
|
usage);
|
|
if (ret)
|
|
goto out2;
|
|
|
|
{
|
|
krb5_principal p1, p2;
|
|
krb5_boolean res;
|
|
|
|
principalname2krb5_principal(&p1,
|
|
ac->authenticator->cname,
|
|
ac->authenticator->crealm);
|
|
principalname2krb5_principal(&p2,
|
|
t.ticket.cname,
|
|
t.ticket.crealm);
|
|
res = krb5_principal_compare (context, p1, p2);
|
|
krb5_free_principal (context, p1);
|
|
krb5_free_principal (context, p2);
|
|
if (!res) {
|
|
ret = KRB5KRB_AP_ERR_BADMATCH;
|
|
krb5_clear_error_string (context);
|
|
goto out2;
|
|
}
|
|
}
|
|
|
|
/* check addresses */
|
|
|
|
if (t.ticket.caddr
|
|
&& ac->remote_address
|
|
&& !krb5_address_search (context,
|
|
ac->remote_address,
|
|
t.ticket.caddr)) {
|
|
ret = KRB5KRB_AP_ERR_BADADDR;
|
|
krb5_clear_error_string (context);
|
|
goto out2;
|
|
}
|
|
|
|
if (ac->authenticator->seq_number)
|
|
krb5_auth_con_setremoteseqnumber(context, ac,
|
|
*ac->authenticator->seq_number);
|
|
|
|
/* XXX - Xor sequence numbers */
|
|
|
|
if (ac->authenticator->subkey) {
|
|
ret = krb5_auth_con_setremotesubkey(context, ac,
|
|
ac->authenticator->subkey);
|
|
if (ret)
|
|
goto out2;
|
|
}
|
|
|
|
if (ap_req_options) {
|
|
*ap_req_options = 0;
|
|
if (ap_req->ap_options.use_session_key)
|
|
*ap_req_options |= AP_OPTS_USE_SESSION_KEY;
|
|
if (ap_req->ap_options.mutual_required)
|
|
*ap_req_options |= AP_OPTS_MUTUAL_REQUIRED;
|
|
}
|
|
|
|
if(ticket){
|
|
*ticket = malloc(sizeof(**ticket));
|
|
**ticket = t;
|
|
} else
|
|
krb5_free_ticket (context, &t);
|
|
if (auth_context) {
|
|
if (*auth_context == NULL)
|
|
*auth_context = ac;
|
|
} else
|
|
krb5_auth_con_free (context, ac);
|
|
return 0;
|
|
out2:
|
|
krb5_free_ticket (context, &t);
|
|
out:
|
|
if (auth_context == NULL || *auth_context == NULL)
|
|
krb5_auth_con_free (context, ac);
|
|
return ret;
|
|
}
|
|
|
|
|
|
krb5_error_code
|
|
krb5_rd_req_with_keyblock(krb5_context context,
|
|
krb5_auth_context *auth_context,
|
|
const krb5_data *inbuf,
|
|
krb5_const_principal server,
|
|
krb5_keyblock *keyblock,
|
|
krb5_flags *ap_req_options,
|
|
krb5_ticket **ticket)
|
|
{
|
|
krb5_error_code ret;
|
|
krb5_ap_req ap_req;
|
|
|
|
if (*auth_context == NULL) {
|
|
ret = krb5_auth_con_init(context, auth_context);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
ret = krb5_decode_ap_req(context, inbuf, &ap_req);
|
|
if(ret)
|
|
return ret;
|
|
|
|
ret = krb5_verify_ap_req(context,
|
|
auth_context,
|
|
&ap_req,
|
|
server,
|
|
keyblock,
|
|
0,
|
|
ap_req_options,
|
|
ticket);
|
|
|
|
free_AP_REQ(&ap_req);
|
|
return ret;
|
|
}
|
|
|
|
static krb5_error_code
|
|
get_key_from_keytab(krb5_context context,
|
|
krb5_auth_context *auth_context,
|
|
krb5_ap_req *ap_req,
|
|
krb5_const_principal server,
|
|
krb5_keytab keytab,
|
|
krb5_keyblock **out_key)
|
|
{
|
|
krb5_keytab_entry entry;
|
|
krb5_error_code ret;
|
|
int kvno;
|
|
krb5_keytab real_keytab;
|
|
|
|
if(keytab == NULL)
|
|
krb5_kt_default(context, &real_keytab);
|
|
else
|
|
real_keytab = keytab;
|
|
|
|
if (ap_req->ticket.enc_part.kvno)
|
|
kvno = *ap_req->ticket.enc_part.kvno;
|
|
else
|
|
kvno = 0;
|
|
|
|
ret = krb5_kt_get_entry (context,
|
|
real_keytab,
|
|
server,
|
|
kvno,
|
|
ap_req->ticket.enc_part.etype,
|
|
&entry);
|
|
if(ret)
|
|
goto out;
|
|
ret = krb5_copy_keyblock(context, &entry.keyblock, out_key);
|
|
krb5_kt_free_entry (context, &entry);
|
|
out:
|
|
if(keytab == NULL)
|
|
krb5_kt_close(context, real_keytab);
|
|
|
|
return ret;
|
|
}
|
|
|
|
krb5_error_code
|
|
krb5_rd_req(krb5_context context,
|
|
krb5_auth_context *auth_context,
|
|
const krb5_data *inbuf,
|
|
krb5_const_principal server,
|
|
krb5_keytab keytab,
|
|
krb5_flags *ap_req_options,
|
|
krb5_ticket **ticket)
|
|
{
|
|
krb5_error_code ret;
|
|
krb5_ap_req ap_req;
|
|
krb5_keyblock *keyblock = NULL;
|
|
krb5_principal service = NULL;
|
|
|
|
if (*auth_context == NULL) {
|
|
ret = krb5_auth_con_init(context, auth_context);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
ret = krb5_decode_ap_req(context, inbuf, &ap_req);
|
|
if(ret)
|
|
return ret;
|
|
|
|
if(server == NULL){
|
|
principalname2krb5_principal(&service,
|
|
ap_req.ticket.sname,
|
|
ap_req.ticket.realm);
|
|
server = service;
|
|
}
|
|
|
|
if(ap_req.ap_options.use_session_key == 0 ||
|
|
(*auth_context)->keyblock == NULL){
|
|
ret = get_key_from_keytab(context,
|
|
auth_context,
|
|
&ap_req,
|
|
server,
|
|
keytab,
|
|
&keyblock);
|
|
if(ret)
|
|
goto out;
|
|
}
|
|
|
|
|
|
ret = krb5_verify_ap_req(context,
|
|
auth_context,
|
|
&ap_req,
|
|
server,
|
|
keyblock,
|
|
0,
|
|
ap_req_options,
|
|
ticket);
|
|
|
|
if(keyblock != NULL)
|
|
krb5_free_keyblock(context, keyblock);
|
|
|
|
out:
|
|
free_AP_REQ(&ap_req);
|
|
if(service)
|
|
krb5_free_principal(context, service);
|
|
return ret;
|
|
}
|