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/*
* Copyright 1994 by OpenVision Technologies, Inc.
*
* Permission to use, copy, modify, distribute, and sell this software
* and its documentation for any purpose is hereby granted without fee,
* provided that the above copyright notice appears in all copies and
* that both that copyright notice and this permission notice appear in
* supporting documentation, and that the name of OpenVision not be used
* in advertising or publicity pertaining to distribution of the software
* without specific, written prior permission. OpenVision makes no
* representations about the suitability of this software for any
* purpose. It is provided "as is" without express or implied warranty.
*
* OPENVISION DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
* EVENT SHALL OPENVISION BE LIABLE FOR ANY SPECIAL, INDIRECT OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
* USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
#include "k5-int.h" /* we need krb5_context::clockskew */
#include <stdio.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <krb.h>
#include <krb4-proto.h>
#include "krb524.h"
/* rather than copying the cmu code, these values are derived from
a calculation based on the table and comments found there.
the expression (in elisp) is:
(defun cmu-to-secs2 (j)
(if (< j 128) (* j 5 60)
(round (* 38400 (expt 1.06914489 (- j 128))))))
and is low by one for 16 values but is exact for the others.
*/
static long cmu_seconds[] =
{
38400, 41055, 43894, 46929, 50174, 53643, 57352, 61318,
65558, 70091, 74937, 80119, 85658, 91581, 97914, 104684,
111922, 119661, 127935, 136781, 146239, 156350, 167161, 178720,
191077, 204289, 218415, 233517, 249663, 266926, 285383, 305116,
326213, 348769, 372885, 398668, 426233, 455705, 487215, 520903,
556921, 595430, 636600, 680618, 727679, 777995, 831789, 889303,
950794, 1016536, 1086825, 1161973, 1242317, 1328217, 1420057, 1518246,
1623225, 1735463, 1855462, 1983757, 2120924, 2267575, 2424366, 2591999,
0
};
/*
* Convert a v5 ticket for server to a v4 ticket, using service key
* skey for both.
*/
int krb524_convert_tkt_skey(context, v5tkt, v4tkt, v5_skey, v4_skey)
krb5_context context;
krb5_ticket *v5tkt;
KTEXT_ST *v4tkt;
krb5_keyblock *v5_skey, *v4_skey;
{
char pname[ANAME_SZ], pinst[INST_SZ], prealm[REALM_SZ];
char sname[ANAME_SZ], sinst[INST_SZ];
krb5_enc_tkt_part *v5etkt;
int ret, lifetime, deltatime;
krb5_timestamp server_time;
v5tkt->enc_part2 = NULL;
if ((ret = krb5_decrypt_tkt_part(context, v5_skey, v5tkt))) {
krb5_free_ticket(context, v5tkt);
return ret;
}
v5etkt = v5tkt->enc_part2;
if ((ret = krb524_convert_princs(context, v5etkt->client, v5tkt->server,
pname, pinst, prealm, sname,
sinst))) {
krb5_free_enc_tkt_part(context, v5etkt);
v5tkt->enc_part2 = NULL;
return ret;
}
if (v5etkt->session->enctype != ENCTYPE_DES_CBC_CRC ||
v5etkt->session->length != sizeof(C_Block)) {
if (krb524_debug)
fprintf(stderr, "v5 session keyblock type %d length %d != C_Block size %d\n",
v5etkt->session->enctype,
v5etkt->session->length,
sizeof(C_Block));
krb5_free_enc_tkt_part(context, v5etkt);
v5tkt->enc_part2 = NULL;
return KRB524_BADKEY;
}
/* V4 has no concept of authtime or renew_till, so ignore them */
/* V4 lifetime is 1 byte, in 5 minute increments */
if (v5etkt->times.starttime == 0)
v5etkt->times.starttime = v5etkt->times.authtime;
/* rather than apply fit an extended v5 lifetime into a v4 range,
give out a v4 ticket with as much of the v5 lifetime is available
"now" instead. */
if ((ret = krb5_timeofday(context, &server_time))) {
if (krb524_debug)
fprintf(stderr, "krb5_timeofday failed!\n");
krb5_free_enc_tkt_part(context, v5etkt);
v5tkt->enc_part2 = NULL;
return ret;
}
if ( (server_time+context->clockskew >= v5etkt->times.starttime)
&& (server_time-context->clockskew <= v5etkt->times.endtime)) {
deltatime = v5etkt->times.endtime - (server_time-context->clockskew);
lifetime = deltatime / 300;
/* if (lifetime > 255) lifetime = 255; */
if (lifetime > 127) {
/* use the CMU algorithm instead: */
long *clist = cmu_seconds;
while(*clist && *clist < deltatime) clist++;
lifetime = 128 + (clist - cmu_seconds);
}
} else {
if (krb524_debug)
fprintf(stderr, "v5 ticket time out of bounds\n");
krb5_free_enc_tkt_part(context, v5etkt);
v5tkt->enc_part2 = NULL;
if (server_time+context->clockskew < v5etkt->times.starttime)
return KRB5KRB_AP_ERR_TKT_NYV;
else if (server_time-context->clockskew > v5etkt->times.endtime)
return KRB5KRB_AP_ERR_TKT_EXPIRED;
else /* shouldn't happen, but just in case... */
return KRB5KRB_AP_ERR_TKT_NYV;
}
/* XXX perhaps we should use the addr of the client host if */
/* v5creds contains more than one addr. Q: Does V4 support */
/* non-INET addresses? */
if (!v5etkt->caddrs || !v5etkt->caddrs[0] ||
v5etkt->caddrs[0]->addrtype != ADDRTYPE_INET) {
if (krb524_debug)
fprintf(stderr, "Invalid v5creds address information.\n");
krb5_free_enc_tkt_part(context, v5etkt);
v5tkt->enc_part2 = NULL;
return KRB524_BADADDR;
}
if (krb524_debug)
printf("startime = %ld, authtime = %ld, lifetime = %ld\n",
(long) v5etkt->times.starttime,
(long) v5etkt->times.authtime,
(long) lifetime);
/* XXX are there V5 flags we should map to V4 equivalents? */
ret = krb_create_ticket(v4tkt,
0, /* flags */
pname,
pinst,
prealm,
*((unsigned long *)v5etkt->caddrs[0]->contents),
(char *) v5etkt->session->contents,
lifetime,
/* issue_data */
v5etkt->times.starttime,
sname,
sinst,
v4_skey->contents);
krb5_free_enc_tkt_part(context, v5etkt);
v5tkt->enc_part2 = NULL;
if (ret == KSUCCESS)
return 0;
else
return KRB524_V4ERR;
}
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