5 * Copyright 1990,1991 by the Massachusetts Institute of Technology.
8 * Export of this software from the United States of America may
9 * require a specific license from the United States Government.
10 * It is the responsibility of any person or organization contemplating
11 * export to obtain such a license before exporting.
13 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
14 * distribute this software and its documentation for any purpose and
15 * without fee is hereby granted, provided that the above copyright
16 * notice appear in all copies and that both that copyright notice and
17 * this permission notice appear in supporting documentation, and that
18 * the name of M.I.T. not be used in advertising or publicity pertaining
19 * to distribution of the software without specific, written prior
20 * permission. M.I.T. makes no representations about the suitability of
21 * this software for any purpose. It is provided "as is" without express
22 * or implied warranty.
25 * KDC Routines to deal with TGS_REQ's
28 #if !defined(lint) && !defined(SABER)
29 static char rcsid_do_tgs_req_c[] =
31 #endif /* !lint & !SABER */
33 #include <krb5/krb5.h>
35 #include <krb5/los-proto.h>
36 #include <krb5/asn1.h>
37 #include <krb5/osconf.h>
38 #include <krb5/ext-proto.h>
43 #include <sys/types.h>
44 #include <netinet/in.h>
46 #include <arpa/inet.h>
55 static void find_alternate_tgs PROTOTYPE((krb5_kdc_req *,
60 static krb5_error_code prepare_error_tgs PROTOTYPE((krb5_kdc_req *,
68 process_tgs_req(pkt, from, is_secondary, response)
70 const krb5_fulladdr *from; /* who sent it ? */
72 krb5_data **response; /* filled in with a response packet */
74 krb5_kdc_req *request = 0;
77 krb5_enc_kdc_rep_part reply_encpart;
78 krb5_ticket ticket_reply, *header_ticket = 0;
79 krb5_tkt_authent *req_authdat = 0;
81 krb5_enc_tkt_part enc_tkt_reply;
82 krb5_transited enc_tkt_transited;
84 krb5_error_code retval = 0;
87 krb5_timestamp kdc_time, authtime;
88 krb5_keyblock *session_key = 0;
89 krb5_timestamp until, rtime;
90 krb5_keyblock encrypting_key;
91 char *cname = 0, *sname = 0, *tmp = 0, *fromstring = 0;
92 krb5_last_req_entry *nolrarray[2], nolrentry;
93 /* krb5_address *noaddrarray[1]; */
94 krb5_enctype useetype;
95 int errcode, errcode2;
106 retval = decode_krb5_tgs_req(pkt, &request);
111 if (from->address->addrtype == ADDRTYPE_INET)
113 (char *) inet_ntoa(*(struct in_addr *)from->address->contents);
116 fromstring = "<unknown>";
118 if (errcode = krb5_unparse_name(request->server, &sname)) {
119 status = "UNPARSING SERVER";
123 errcode = kdc_process_tgs_req(request, from, pkt, &req_authdat);
125 header_ticket = req_authdat->ticket;
127 if (header_ticket && header_ticket->enc_part2 &&
128 (errcode2 = krb5_unparse_name(header_ticket->enc_part2->client,
130 status = "UNPARSING CLIENT";
136 status = "PROCESS_TGS";
140 if (!header_ticket) {
141 status="UNEXPECTED NULL in header_ticket";
146 * We've already dealt with the AP_REQ authentication, so we can
147 * use header_ticket freely. The encrypted part (if any) has been
148 * decrypted with the session key.
151 authtime = header_ticket->enc_part2->times.authtime;
153 /* XXX make sure server here has the proper realm...taken from AP_REQ
157 if (retval = krb5_db_get_principal(request->server, &server, &nprincs,
160 "TGS_REQ: GET_PRINCIPAL: authtime %d, host %s, %s for %s (%s)",
161 authtime, fromstring, cname, sname, error_message(retval));
167 status = "NON_UNIQUE_PRINCIPAL";
168 errcode = KRB5KDC_ERR_PRINCIPAL_NOT_UNIQUE;
170 } else if (nprincs != 1) {
172 * might be a request for a TGT for some other realm; we
173 * should do our best to find such a TGS in this db
175 if (firstpass && krb5_princ_size(request->server) == 2) {
176 krb5_data *server_1 = krb5_princ_component(request->server, 1);
177 krb5_data *tgs_1 = krb5_princ_component(tgs_server, 1);
179 if (server_1->length != tgs_1->length ||
180 memcmp(server_1->data, tgs_1->data, tgs_1->length)) {
181 krb5_db_free_principal(&server, nprincs);
182 find_alternate_tgs(request, &server, &more, &nprincs);
187 krb5_db_free_principal(&server, nprincs);
188 status = "UNKNOWN_SERVER";
189 errcode = KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN;
193 if (retval = krb5_timeofday(&kdc_time)) {
194 status = "TIME_OF_DAY";
198 if (retval = validate_tgs_request(request, server, header_ticket,
199 kdc_time, &status)) {
201 status = "UNKNOWN_REASON";
202 errcode = retval + ERROR_TABLE_BASE_krb5;
206 for (i = 0; i < request->netypes; i++)
207 if (valid_etype(request->etype[i]))
209 if (i == request->netypes) {
210 /* unsupported etype */
211 status = "BAD_ENCRYPTION_TYPE";
212 errcode = KRB5KDC_ERR_ETYPE_NOSUPP;
215 useetype = request->etype[i];
217 if (retval = (*(krb5_csarray[useetype]->system->random_key))(krb5_csarray[useetype]->random_sequence, &session_key)) {
218 /* random key failed */
219 status = "RANDOM_KEY_FAILED";
223 ticket_reply.server = request->server; /* XXX careful for realm... */
224 ticket_reply.enc_part.etype = useetype;
225 ticket_reply.enc_part.kvno = server.kvno;
227 enc_tkt_reply.flags = 0;
228 enc_tkt_reply.times.starttime = 0;
231 * Fix header_ticket's starttime; if it's zero, fill in the
234 if (!(header_ticket->enc_part2->times.starttime))
235 header_ticket->enc_part2->times.starttime =
236 header_ticket->enc_part2->times.authtime;
238 /* don't use new addresses unless forwarded, see below */
240 enc_tkt_reply.caddrs = header_ticket->enc_part2->caddrs;
241 /* noaddrarray[0] = 0; */
242 reply_encpart.caddrs = 0; /* optional...don't put it in */
244 /* It should be noted that local policy may affect the */
245 /* processing of any of these flags. For example, some */
246 /* realms may refuse to issue renewable tickets */
248 if (isflagset(request->kdc_options, KDC_OPT_FORWARDABLE))
249 setflag(enc_tkt_reply.flags, TKT_FLG_FORWARDABLE);
251 if (isflagset(request->kdc_options, KDC_OPT_FORWARDED)) {
252 setflag(enc_tkt_reply.flags, TKT_FLG_FORWARDED);
254 /* include new addresses in ticket & reply */
256 enc_tkt_reply.caddrs = request->addresses;
257 reply_encpart.caddrs = request->addresses;
259 if (isflagset(header_ticket->enc_part2->flags, TKT_FLG_FORWARDED))
260 setflag(enc_tkt_reply.flags, TKT_FLG_FORWARDED);
262 if (isflagset(request->kdc_options, KDC_OPT_PROXIABLE))
263 setflag(enc_tkt_reply.flags, TKT_FLG_PROXIABLE);
265 if (isflagset(request->kdc_options, KDC_OPT_PROXY)) {
266 setflag(enc_tkt_reply.flags, TKT_FLG_PROXY);
268 /* include new addresses in ticket & reply */
270 enc_tkt_reply.caddrs = request->addresses;
271 reply_encpart.caddrs = request->addresses;
274 if (isflagset(request->kdc_options, KDC_OPT_ALLOW_POSTDATE))
275 setflag(enc_tkt_reply.flags, TKT_FLG_MAY_POSTDATE);
277 if (isflagset(request->kdc_options, KDC_OPT_POSTDATED)) {
278 setflag(enc_tkt_reply.flags, TKT_FLG_POSTDATED);
279 setflag(enc_tkt_reply.flags, TKT_FLG_INVALID);
280 enc_tkt_reply.times.starttime = request->from;
282 enc_tkt_reply.times.starttime = kdc_time;
284 if (isflagset(request->kdc_options, KDC_OPT_VALIDATE)) {
285 /* BEWARE of allocation hanging off of ticket & enc_part2, it belongs
287 ticket_reply = *(header_ticket);
288 enc_tkt_reply = *(header_ticket->enc_part2);
289 clear(enc_tkt_reply.flags, TKT_FLG_INVALID);
292 if (isflagset(request->kdc_options, KDC_OPT_RENEW)) {
293 krb5_deltat old_life;
295 /* BEWARE of allocation hanging off of ticket & enc_part2, it belongs
297 ticket_reply = *(header_ticket);
298 enc_tkt_reply = *(header_ticket->enc_part2);
300 old_life = enc_tkt_reply.times.endtime - enc_tkt_reply.times.starttime;
302 enc_tkt_reply.times.starttime = kdc_time;
303 enc_tkt_reply.times.endtime =
304 min(header_ticket->enc_part2->times.renew_till,
305 kdc_time + old_life);
307 /* not a renew request */
308 enc_tkt_reply.times.starttime = kdc_time;
309 until = (request->till == 0) ? kdc_infinity : request->till;
310 enc_tkt_reply.times.endtime =
311 min(until, min(enc_tkt_reply.times.starttime + server.max_life,
312 min(enc_tkt_reply.times.starttime + max_life_for_realm,
313 header_ticket->enc_part2->times.endtime)));
314 if (isflagset(request->kdc_options, KDC_OPT_RENEWABLE_OK) &&
315 (enc_tkt_reply.times.endtime < request->till) &&
316 isflagset(header_ticket->enc_part2->flags,
317 TKT_FLG_RENEWABLE)) {
318 setflag(request->kdc_options, KDC_OPT_RENEWABLE);
321 header_ticket->enc_part2->times.renew_till);
324 rtime = (request->rtime == 0) ? kdc_infinity : request->rtime;
326 if (isflagset(request->kdc_options, KDC_OPT_RENEWABLE)) {
327 /* already checked above in policy check to reject request for a
328 renewable ticket using a non-renewable ticket */
329 setflag(enc_tkt_reply.flags, TKT_FLG_RENEWABLE);
330 enc_tkt_reply.times.renew_till =
332 min(header_ticket->enc_part2->times.renew_till,
333 enc_tkt_reply.times.starttime +
334 min(server.max_renewable_life,
335 max_renewable_life_for_realm)));
337 enc_tkt_reply.times.renew_till = 0;
341 * Set authtime to be the same as header_ticket's
343 enc_tkt_reply.times.authtime = header_ticket->enc_part2->times.authtime;
346 * Propagate the preauthentication flags through to the returned ticket.
348 if (isflagset(header_ticket->enc_part2->flags, TKT_FLG_PRE_AUTH))
349 setflag(enc_tkt_reply.flags, TKT_FLG_PRE_AUTH);
351 if (isflagset(header_ticket->enc_part2->flags, TKT_FLG_HW_AUTH))
352 setflag(enc_tkt_reply.flags, TKT_FLG_HW_AUTH);
354 /* starttime is optional, and treated as authtime if not present.
355 so we can nuke it if it matches */
356 if (enc_tkt_reply.times.starttime == enc_tkt_reply.times.authtime)
357 enc_tkt_reply.times.starttime = 0;
359 /* assemble any authorization data */
360 if (request->authorization_data.ciphertext.data) {
361 krb5_encrypt_block eblock;
364 /* decrypt the authdata in the request */
365 if (!valid_etype(request->authorization_data.etype)) {
366 status = "BAD_AUTH_ETYPE";
367 errcode = KRB5KDC_ERR_ETYPE_NOSUPP;
370 /* put together an eblock for this encryption */
372 krb5_use_cstype(&eblock, request->authorization_data.etype);
374 scratch.length = request->authorization_data.ciphertext.length;
376 malloc(request->authorization_data.ciphertext.length))) {
377 status = "AUTH_NOMEM";
380 /* do any necessary key pre-processing */
381 if (retval = krb5_process_key(&eblock,
382 header_ticket->enc_part2->session)) {
383 status = "AUTH_PROCESS_KEY";
388 /* call the encryption routine */
389 if (retval = krb5_decrypt((krb5_pointer) request->authorization_data.ciphertext.data,
390 (krb5_pointer) scratch.data,
391 scratch.length, &eblock, 0)) {
392 status = "AUTH_ENCRYPT_FAIL";
393 (void) krb5_finish_key(&eblock);
397 if (retval = krb5_finish_key(&eblock)) {
398 status = "AUTH_FINISH_KEY";
402 /* scratch now has the authorization data, so we decode it */
403 retval = decode_krb5_authdata(&scratch, request->unenc_authdata);
406 status = "AUTH_DECODE";
411 concat_authorization_data(request->unenc_authdata,
412 header_ticket->enc_part2->authorization_data,
413 &enc_tkt_reply.authorization_data)) {
414 status = "CONCAT_AUTH";
418 enc_tkt_reply.authorization_data =
419 header_ticket->enc_part2->authorization_data;
421 enc_tkt_reply.session = session_key;
422 enc_tkt_reply.client = header_ticket->enc_part2->client;
423 enc_tkt_reply.transited.tr_type = KRB5_DOMAIN_X500_COMPRESS;
424 enc_tkt_reply.transited.tr_contents = empty_string; /* equivalent of "" */
426 /* realm compare is like strcmp, but knows how to deal with these args */
427 if (realm_compare(realm_of_tgt(header_ticket),
428 header_ticket->server)) {
429 /* tgt issued by local realm */
430 enc_tkt_reply.transited = header_ticket->enc_part2->transited;
432 /* assemble new transited field into allocated storage */
433 if (header_ticket->enc_part2->transited.tr_type !=
434 KRB5_DOMAIN_X500_COMPRESS) {
435 status = "BAD_TRTYPE";
436 errcode = KRB5KDC_ERR_TRTYPE_NOSUPP;
439 enc_tkt_transited.tr_type = KRB5_DOMAIN_X500_COMPRESS;
440 enc_tkt_transited.tr_contents.data = 0;
441 enc_tkt_transited.tr_contents.length = 0;
442 enc_tkt_reply.transited = enc_tkt_transited;
444 add_to_transited(&header_ticket->enc_part2->transited.tr_contents,
445 &enc_tkt_reply.transited.tr_contents,
446 header_ticket->server,
447 enc_tkt_reply.client,
449 status = "ADD_TR_FAIL";
455 ticket_reply.enc_part2 = &enc_tkt_reply;
457 if (isflagset(request->kdc_options, KDC_OPT_ENC_TKT_IN_SKEY)) {
458 krb5_keyblock *st_sealing_key;
459 krb5_kvno st_srv_kvno;
461 if (retval = kdc_get_server_key(request->second_ticket[st_idx],
464 status = "2ND_TKT_SERVER";
468 /* decrypt the ticket */
469 retval = krb5_decrypt_tkt_part(st_sealing_key,
470 request->second_ticket[st_idx]);
471 krb5_free_keyblock(st_sealing_key);
473 status = "2ND_TKT_DECRYPT";
478 * Make sure the client for the second ticket matches
481 if (!krb5_principal_compare(request->server,
482 request->second_ticket[st_idx]->enc_part2->client)) {
483 if (retval = krb5_unparse_name(request->second_ticket[st_idx]->enc_part2->client, &tmp))
485 syslog(LOG_INFO, "TGS_REQ: 2ND_TKT_MISMATCH: authtime %d, host %s, %s for %s, 2nd tkt client %s",
486 authtime, fromstring, cname, sname,
487 tmp ? tmp : "<unknown>");
491 if (retval = krb5_encrypt_tkt_part(request->second_ticket[st_idx]->enc_part2->session,
493 status = "2ND_TKT_ENCRYPT";
498 /* convert server.key into a real key (it may be encrypted
500 if (retval = KDB_CONVERT_KEY_OUTOF_DB(&server.key, &encrypting_key)) {
505 retval = krb5_encrypt_tkt_part(&encrypting_key, &ticket_reply);
507 memset((char *)encrypting_key.contents, 0, encrypting_key.length);
508 krb5_xfree(encrypting_key.contents);
511 status = "TKT_ENCRYPT";
516 /* Start assembling the response */
517 reply.msg_type = KRB5_TGS_REP;
518 reply.padata = 0; /* always */
519 reply.client = header_ticket->enc_part2->client;
520 reply.enc_part.etype = useetype;
521 reply.enc_part.kvno = 0; /* We are using the session key */
522 reply.ticket = &ticket_reply;
524 reply_encpart.session = session_key;
525 reply_encpart.nonce = request->nonce;
527 /* copy the time fields EXCEPT for authtime; its location
529 reply_encpart.times = enc_tkt_reply.times;
530 reply_encpart.times.authtime = header_ticket->enc_part2->times.authtime;
532 /* starttime is optional, and treated as authtime if not present.
533 so we can nuke it if it matches */
534 if (enc_tkt_reply.times.starttime == enc_tkt_reply.times.authtime)
535 enc_tkt_reply.times.starttime = 0;
537 nolrentry.lr_type = KRB5_LRQ_NONE;
539 nolrarray[0] = &nolrentry;
541 reply_encpart.last_req = nolrarray; /* not available for TGS reqs */
542 reply_encpart.key_exp = 0; /* ditto */
543 reply_encpart.flags = enc_tkt_reply.flags;
544 reply_encpart.server = ticket_reply.server;
546 /* use the session key in the ticket, unless there's a subsession key
549 retval = krb5_encode_kdc_rep(KRB5_TGS_REP, &reply_encpart,
550 req_authdat->authenticator->subkey ?
551 req_authdat->authenticator->subkey :
552 header_ticket->enc_part2->session,
555 status = "ENCODE_KDC_REP";
560 memset(ticket_reply.enc_part.ciphertext.data, 0,
561 ticket_reply.enc_part.ciphertext.length);
562 free(ticket_reply.enc_part.ciphertext.data);
563 /* these parts are left on as a courtesy from krb5_encode_kdc_rep so we
564 can use them in raw form if needed. But, we don't... */
565 memset(reply.enc_part.ciphertext.data, 0,
566 reply.enc_part.ciphertext.length);
567 free(reply.enc_part.ciphertext.data);
571 syslog(LOG_INFO, "TGS_REQ%c %s: authtime %d, host %s, %s for %s%s%s",
572 secondary_ch, status, authtime, fromstring,
573 cname ? cname : "<unknown client>",
574 sname ? sname : "<unknown server>",
576 errcode ? error_message(errcode) : "");
578 errcode -= ERROR_TABLE_BASE_krb5;
579 if (errcode < 0 || errcode > 128)
580 errcode = KRB_ERR_GENERIC;
582 retval = prepare_error_tgs(request, header_ticket, errcode,
583 fromstring, response);
587 krb5_free_kdc_req(request);
589 krb5_free_tkt_authent(req_authdat);
595 krb5_db_free_principal(&server, 1);
597 krb5_free_keyblock(session_key);
599 free(enc_tkt_reply.transited.tr_contents.data);
604 static krb5_error_code
605 prepare_error_tgs (request, ticket, error, ident, response)
606 register krb5_kdc_req *request;
610 krb5_data **response;
613 krb5_error_code retval;
616 errpkt.ctime = request->nonce;
619 if (retval = krb5_us_timeofday(&errpkt.stime, &errpkt.susec)) {
621 krb5_free_ticket(ticket);
624 errpkt.error = error;
625 errpkt.server = request->server;
626 if (ticket && ticket->enc_part2)
627 errpkt.client = ticket->enc_part2->client;
630 errpkt.text.length = strlen(error_message(error+KRB5KDC_ERR_NONE))+1;
631 if (!(errpkt.text.data = malloc(errpkt.text.length))) {
633 krb5_free_ticket(ticket);
636 (void) strcpy(errpkt.text.data, error_message(error+KRB5KDC_ERR_NONE));
638 if (!(scratch = (krb5_data *)malloc(sizeof(*scratch)))) {
639 free(errpkt.text.data);
641 krb5_free_ticket(ticket);
644 errpkt.e_data.length = 0;
645 errpkt.e_data.data = 0;
647 retval = krb5_mk_error(&errpkt, scratch);
648 free(errpkt.text.data);
651 krb5_free_ticket(ticket);
656 * The request seems to be for a ticket-granting service somewhere else,
657 * but we don't have a ticket for the final TGS. Try to give the requestor
658 * some intermediate realm.
661 find_alternate_tgs(request, server, more, nprincs)
662 krb5_kdc_req *request;
663 krb5_db_entry *server;
667 krb5_error_code retval;
668 krb5_principal *plist, *pl2;
674 if (retval = krb5_walk_realm_tree(krb5_princ_realm(request->server),
675 krb5_princ_component(request->server, 1),
676 &plist, KRB5_REALM_BRANCH_CHAR))
679 /* move to the end */
680 for (pl2 = plist; *pl2; pl2++);
682 /* the first entry in this array is for krbtgt/local@local, so we
684 while (--pl2 > plist) {
686 tmp = krb5_princ_realm(*pl2);
687 krb5_princ_set_realm(*pl2, krb5_princ_realm(tgs_server));
688 retval = krb5_db_get_principal(*pl2, server, nprincs, more);
689 krb5_princ_set_realm(*pl2, tmp);
693 krb5_free_realm_tree(plist);
697 krb5_db_free_principal(server, *nprincs);
699 } else if (*nprincs == 1) {
701 krb5_principal tmpprinc;
704 tmp = krb5_princ_realm(*pl2);
705 krb5_princ_set_realm(*pl2, krb5_princ_realm(tgs_server));
706 if (retval = krb5_copy_principal(*pl2, &tmpprinc)) {
707 krb5_db_free_principal(server, *nprincs);
708 krb5_princ_set_realm(*pl2, tmp);
711 krb5_princ_set_realm(*pl2, tmp);
713 krb5_free_principal(request->server);
714 request->server = tmpprinc;
715 if (krb5_unparse_name(request->server, &sname)) {
717 "TGS_REQ: issuing alternate <un-unparseable> TGT");
720 "TGS_REQ: issuing TGT %s", sname);
725 krb5_db_free_principal(server, *nprincs);
731 krb5_free_realm_tree(plist);