2 * Copyright (c) 1997 - 2005 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the Institute nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 RCSID("$Id: kaserver.c,v 1.30 2005/06/30 01:49:39 lha Exp $");
38 #include <krb5-v4compat.h>
41 #define KA_AUTHENTICATION_SERVICE 731
42 #define KA_TICKET_GRANTING_SERVICE 732
43 #define KA_MAINTENANCE_SERVICE 733
45 #define AUTHENTICATE_OLD 1
46 #define CHANGEPASSWORD 2
47 #define GETTICKET_OLD 3
56 #define GETPASSWORD 12
57 #define GETRANDOMKEY 13
58 #define AUTHENTICATE 21
59 #define AUTHENTICATE_V2 22
62 /* XXX - Where do we get these? */
64 #define RXGEN_OPCODE (-455)
66 #define KADATABASEINCONSISTENT (180480L)
67 #define KAEXIST (180481L)
68 #define KAIO (180482L)
69 #define KACREATEFAIL (180483L)
70 #define KANOENT (180484L)
71 #define KAEMPTY (180485L)
72 #define KABADNAME (180486L)
73 #define KABADINDEX (180487L)
74 #define KANOAUTH (180488L)
75 #define KAANSWERTOOLONG (180489L)
76 #define KABADREQUEST (180490L)
77 #define KAOLDINTERFACE (180491L)
78 #define KABADARGUMENT (180492L)
79 #define KABADCMD (180493L)
80 #define KANOKEYS (180494L)
81 #define KAREADPW (180495L)
82 #define KABADKEY (180496L)
83 #define KAUBIKINIT (180497L)
84 #define KAUBIKCALL (180498L)
85 #define KABADPROTOCOL (180499L)
86 #define KANOCELLS (180500L)
87 #define KANOCELL (180501L)
88 #define KATOOMANYUBIKS (180502L)
89 #define KATOOMANYKEYS (180503L)
90 #define KABADTICKET (180504L)
91 #define KAUNKNOWNKEY (180505L)
92 #define KAKEYCACHEINVALID (180506L)
93 #define KABADSERVER (180507L)
94 #define KABADUSER (180508L)
95 #define KABADCPW (180509L)
96 #define KABADCREATE (180510L)
97 #define KANOTICKET (180511L)
98 #define KAASSOCUSER (180512L)
99 #define KANOTSPECIAL (180513L)
100 #define KACLOCKSKEW (180514L)
101 #define KANORECURSE (180515L)
102 #define KARXFAIL (180516L)
103 #define KANULLPASSWORD (180517L)
104 #define KAINTERNALERROR (180518L)
105 #define KAPWEXPIRED (180519L)
106 #define KAREUSED (180520L)
107 #define KATOOSOON (180521L)
108 #define KALOCKED (180522L)
111 decode_rx_header (krb5_storage *sp,
114 krb5_ret_int32(sp, &h->epoch);
115 krb5_ret_int32(sp, &h->connid);
116 krb5_ret_int32(sp, &h->callid);
117 krb5_ret_int32(sp, &h->seqno);
118 krb5_ret_int32(sp, &h->serialno);
119 krb5_ret_int8(sp, &h->type);
120 krb5_ret_int8(sp, &h->flags);
121 krb5_ret_int8(sp, &h->status);
122 krb5_ret_int8(sp, &h->secindex);
123 krb5_ret_int16(sp, &h->reserved);
124 krb5_ret_int16(sp, &h->serviceid);
128 encode_rx_header (struct rx_header *h,
131 krb5_store_int32(sp, h->epoch);
132 krb5_store_int32(sp, h->connid);
133 krb5_store_int32(sp, h->callid);
134 krb5_store_int32(sp, h->seqno);
135 krb5_store_int32(sp, h->serialno);
136 krb5_store_int8(sp, h->type);
137 krb5_store_int8(sp, h->flags);
138 krb5_store_int8(sp, h->status);
139 krb5_store_int8(sp, h->secindex);
140 krb5_store_int16(sp, h->reserved);
141 krb5_store_int16(sp, h->serviceid);
145 init_reply_header (struct rx_header *hdr,
146 struct rx_header *reply_hdr,
150 reply_hdr->epoch = hdr->epoch;
151 reply_hdr->connid = hdr->connid;
152 reply_hdr->callid = hdr->callid;
153 reply_hdr->seqno = 1;
154 reply_hdr->serialno = 1;
155 reply_hdr->type = type;
156 reply_hdr->flags = flags;
157 reply_hdr->status = 0;
158 reply_hdr->secindex = 0;
159 reply_hdr->reserved = 0;
160 reply_hdr->serviceid = hdr->serviceid;
164 make_error_reply (struct rx_header *hdr,
170 struct rx_header reply_hdr;
172 init_reply_header (hdr, &reply_hdr, HT_ABORT, HF_LAST);
173 sp = krb5_storage_emem();
174 encode_rx_header (&reply_hdr, sp);
175 krb5_store_int32(sp, ret);
176 krb5_storage_to_data (sp, reply);
177 krb5_storage_free (sp);
180 static krb5_error_code
181 krb5_ret_xdr_data(krb5_storage *sp,
186 ret = krb5_ret_int32(sp, &size);
194 size_t pad = (4 - size % 4) % 4;
196 data->data = malloc(size);
197 if (data->data == NULL)
199 ret = krb5_storage_read(sp, data->data, size);
201 return (ret < 0)? errno : KRB5_CC_END;
203 ret = krb5_storage_read(sp, foo, pad);
205 return (ret < 0)? errno : KRB5_CC_END;
212 static krb5_error_code
213 krb5_store_xdr_data(krb5_storage *sp,
216 u_char zero[4] = {0, 0, 0, 0};
220 ret = krb5_store_int32(sp, data.length);
223 ret = krb5_storage_write(sp, data.data, data.length);
224 if(ret != data.length){
229 pad = (4 - data.length % 4) % 4;
231 ret = krb5_storage_write(sp, zero, pad);
242 static krb5_error_code
243 create_reply_ticket (krb5_context context,
244 struct rx_header *hdr,
246 char *name, char *instance, char *realm,
247 struct sockaddr_in *addr,
251 const char *sname, const char *sinstance,
258 krb5_keyblock session;
261 struct rx_header reply_hdr;
264 unsigned fyrtiosjuelva;
266 /* create the ticket */
268 krb5_generate_random_keyblock(context, ETYPE_DES_PCBC_NONE, &session);
270 _krb5_krb_create_ticket(context,
275 addr->sin_addr.s_addr,
284 /* create the encrypted part of the reply */
285 sp = krb5_storage_emem ();
286 krb5_generate_random_block(&fyrtiosjuelva, sizeof(fyrtiosjuelva));
287 fyrtiosjuelva &= 0xffffffff;
288 krb5_store_int32 (sp, fyrtiosjuelva);
289 krb5_store_int32 (sp, challenge);
290 krb5_storage_write (sp, session.keyvalue.data, 8);
291 krb5_free_keyblock_contents(context, &session);
292 krb5_store_int32 (sp, kdc_time);
293 krb5_store_int32 (sp, kdc_time + _krb5_krb_life_to_time (0, life));
294 krb5_store_int32 (sp, kvno);
295 krb5_store_int32 (sp, ticket.length);
296 krb5_store_stringz (sp, name);
297 krb5_store_stringz (sp, instance);
298 #if 1 /* XXX - Why shouldn't the realm go here? */
299 krb5_store_stringz (sp, "");
301 krb5_store_stringz (sp, realm);
303 krb5_store_stringz (sp, sname);
304 krb5_store_stringz (sp, sinstance);
305 krb5_storage_write (sp, ticket.data, ticket.length);
306 krb5_storage_write (sp, label, strlen(label));
308 /* pad to DES block */
309 memset (zero, 0, sizeof(zero));
310 pad = (8 - krb5_storage_seek (sp, 0, SEEK_CUR) % 8) % 8;
311 krb5_storage_write (sp, zero, pad);
313 krb5_storage_to_data (sp, &enc_data);
314 krb5_storage_free (sp);
316 if (enc_data.length > max_seq_len) {
317 krb5_data_free (&enc_data);
318 make_error_reply (hdr, KAANSWERTOOLONG, reply);
324 DES_key_schedule schedule;
327 memcpy (&deskey, key->keyvalue.data, sizeof(deskey));
328 DES_set_key (&deskey, &schedule);
329 DES_pcbc_encrypt (enc_data.data,
335 memset (&schedule, 0, sizeof(schedule));
336 memset (&deskey, 0, sizeof(deskey));
339 /* create the reply packet */
340 init_reply_header (hdr, &reply_hdr, HT_DATA, HF_LAST);
341 sp = krb5_storage_emem ();
342 encode_rx_header (&reply_hdr, sp);
343 krb5_store_int32 (sp, max_seq_len);
344 krb5_store_xdr_data (sp, enc_data);
345 krb5_data_free (&enc_data);
346 krb5_storage_to_data (sp, reply);
347 krb5_storage_free (sp);
351 static krb5_error_code
352 unparse_auth_args (krb5_storage *sp,
358 int32_t *max_seq_len)
363 krb5_ret_xdr_data (sp, &data);
364 *name = malloc(data.length + 1);
367 memcpy (*name, data.data, data.length);
368 (*name)[data.length] = '\0';
369 krb5_data_free (&data);
371 krb5_ret_xdr_data (sp, &data);
372 *instance = malloc(data.length + 1);
373 if (*instance == NULL) {
377 memcpy (*instance, data.data, data.length);
378 (*instance)[data.length] = '\0';
379 krb5_data_free (&data);
381 krb5_ret_int32 (sp, &tmp);
383 krb5_ret_int32 (sp, &tmp);
385 krb5_ret_xdr_data (sp, request);
386 krb5_ret_int32 (sp, max_seq_len);
387 /* ignore the rest */
392 do_authenticate (krb5_context context,
393 krb5_kdc_configuration *config,
394 struct rx_header *hdr,
396 struct sockaddr_in *addr,
402 char *instance = NULL;
407 hdb_entry *client_entry = NULL;
408 hdb_entry *server_entry = NULL;
411 krb5_storage *reply_sp;
415 char client_name[256];
416 char server_name[256];
418 krb5_data_zero (&request);
420 ret = unparse_auth_args (sp, &name, &instance, &start_time, &end_time,
421 &request, &max_seq_len);
422 if (ret != 0 || request.length < 8) {
423 make_error_reply (hdr, KABADREQUEST, reply);
427 snprintf (client_name, sizeof(client_name), "%s.%s@%s",
428 name, instance, config->v4_realm);
429 snprintf (server_name, sizeof(server_name), "%s.%s@%s",
430 "krbtgt", config->v4_realm, config->v4_realm);
432 kdc_log(context, config, 0, "AS-REQ (kaserver) %s from %s for %s",
433 client_name, from, server_name);
435 ret = _kdc_db_fetch4 (context, config, name, instance,
436 config->v4_realm, HDB_ENT_TYPE_CLIENT,
439 kdc_log(context, config, 0, "Client not found in database: %s: %s",
440 client_name, krb5_get_err_text(context, ret));
441 make_error_reply (hdr, KANOENT, reply);
445 ret = _kdc_db_fetch4 (context, config, "krbtgt",
446 config->v4_realm, config->v4_realm,
447 HDB_ENT_TYPE_SERVER, &server_entry);
449 kdc_log(context, config, 0, "Server not found in database: %s: %s",
450 server_name, krb5_get_err_text(context, ret));
451 make_error_reply (hdr, KANOENT, reply);
455 ret = _kdc_check_flags (context, config,
456 client_entry, client_name,
457 server_entry, server_name,
460 make_error_reply (hdr, KAPWEXPIRED, reply);
465 ret = _kdc_get_des_key(context, client_entry, FALSE, TRUE, &ckey);
467 kdc_log(context, config, 0, "no suitable DES key for client");
468 make_error_reply (hdr, KANOKEYS, reply);
473 ret = _kdc_get_des_key(context, server_entry, TRUE, TRUE, &skey);
475 kdc_log(context, config, 0, "no suitable DES key for server");
476 make_error_reply (hdr, KANOKEYS, reply);
482 DES_key_schedule schedule;
484 /* try to decode the `request' */
485 memcpy (&key, ckey->key.keyvalue.data, sizeof(key));
486 DES_set_key (&key, &schedule);
487 DES_pcbc_encrypt (request.data,
493 memset (&schedule, 0, sizeof(schedule));
494 memset (&key, 0, sizeof(key));
497 /* check for the magic label */
498 if (memcmp ((char *)request.data + 4, "gTGS", 4) != 0) {
499 kdc_log(context, config, 0, "preauth failed for %s", client_name);
500 make_error_reply (hdr, KABADREQUEST, reply);
504 reply_sp = krb5_storage_from_mem (request.data, 4);
505 krb5_ret_int32 (reply_sp, &chal);
506 krb5_storage_free (reply_sp);
508 if (abs(chal - kdc_time) > context->max_skew) {
509 make_error_reply (hdr, KACLOCKSKEW, reply);
514 max_life = end_time - kdc_time;
515 /* end_time - kdc_time can sometimes be non-positive due to slight
516 time skew between client and server. Let's make sure it is postive */
519 if (client_entry->max_life)
520 max_life = min(max_life, *client_entry->max_life);
521 if (server_entry->max_life)
522 max_life = min(max_life, *server_entry->max_life);
524 life = krb_time_to_life(kdc_time, kdc_time + max_life);
526 create_reply_ticket (context,
528 name, instance, config->v4_realm,
529 addr, life, server_entry->kvno,
531 "krbtgt", config->v4_realm,
536 if (request.length) {
537 memset (request.data, 0, request.length);
538 krb5_data_free (&request);
545 _kdc_free_ent (context, client_entry);
547 _kdc_free_ent (context, server_entry);
550 static krb5_error_code
551 unparse_getticket_args (krb5_storage *sp,
558 int32_t *max_seq_len)
563 krb5_ret_int32 (sp, &tmp);
566 krb5_ret_xdr_data (sp, &data);
567 *auth_domain = malloc(data.length + 1);
568 if (*auth_domain == NULL)
570 memcpy (*auth_domain, data.data, data.length);
571 (*auth_domain)[data.length] = '\0';
572 krb5_data_free (&data);
574 krb5_ret_xdr_data (sp, ticket);
576 krb5_ret_xdr_data (sp, &data);
577 *name = malloc(data.length + 1);
582 memcpy (*name, data.data, data.length);
583 (*name)[data.length] = '\0';
584 krb5_data_free (&data);
586 krb5_ret_xdr_data (sp, &data);
587 *instance = malloc(data.length + 1);
588 if (*instance == NULL) {
593 memcpy (*instance, data.data, data.length);
594 (*instance)[data.length] = '\0';
595 krb5_data_free (&data);
597 krb5_ret_xdr_data (sp, times);
599 krb5_ret_int32 (sp, max_seq_len);
600 /* ignore the rest */
605 do_getticket (krb5_context context,
606 krb5_kdc_configuration *config,
607 struct rx_header *hdr,
609 struct sockaddr_in *addr,
615 char *auth_domain = NULL;
618 char *instance = NULL;
621 hdb_entry *server_entry = NULL;
622 hdb_entry *client_entry = NULL;
623 hdb_entry *krbtgt_entry = NULL;
627 DES_key_schedule schedule;
631 time_t start_time, end_time;
632 char server_name[256];
633 char client_name[256];
634 struct _krb5_krb_auth_data ad;
636 krb5_data_zero (&aticket);
637 krb5_data_zero (×);
639 memset(&ad, 0, sizeof(ad));
641 unparse_getticket_args (sp, &kvno, &auth_domain, &aticket,
642 &name, &instance, ×, &max_seq_len);
643 if (times.length < 8) {
644 make_error_reply (hdr, KABADREQUEST, reply);
649 snprintf (server_name, sizeof(server_name),
650 "%s.%s@%s", name, instance, config->v4_realm);
652 ret = _kdc_db_fetch4 (context, config, name, instance,
653 config->v4_realm, HDB_ENT_TYPE_SERVER,
656 kdc_log(context, config, 0, "Server not found in database: %s: %s",
657 server_name, krb5_get_err_text(context, ret));
658 make_error_reply (hdr, KANOENT, reply);
662 ret = _kdc_db_fetch4 (context, config, "krbtgt",
663 config->v4_realm, config->v4_realm,
664 HDB_ENT_TYPE_CLIENT, &krbtgt_entry);
666 kdc_log(context, config, 0,
667 "Server not found in database: %s.%s@%s: %s",
668 "krbtgt", config->v4_realm, config->v4_realm,
669 krb5_get_err_text(context, ret));
670 make_error_reply (hdr, KANOENT, reply);
675 ret = _kdc_get_des_key(context, krbtgt_entry, TRUE, TRUE, &kkey);
677 kdc_log(context, config, 0, "no suitable DES key for krbtgt");
678 make_error_reply (hdr, KANOKEYS, reply);
683 ret = _kdc_get_des_key(context, server_entry, TRUE, TRUE, &skey);
685 kdc_log(context, config, 0, "no suitable DES key for server");
686 make_error_reply (hdr, KANOKEYS, reply);
690 /* decrypt the incoming ticket */
691 memcpy (&key, kkey->key.keyvalue.data, sizeof(key));
693 /* unpack the ticket */
696 char *sinstance = NULL;
698 ret = _krb5_krb_decomp_ticket(context, &aticket, &kkey->key,
699 config->v4_realm, &sname,
702 kdc_log(context, config, 0,
703 "kaserver: decomp failed for %s.%s with %d",
704 sname, sinstance, ret);
705 make_error_reply (hdr, KABADTICKET, reply);
709 if (strcmp (sname, "krbtgt") != 0
710 || strcmp (sinstance, config->v4_realm) != 0) {
711 kdc_log(context, config, 0, "no TGT: %s.%s for %s.%s@%s",
713 ad.pname, ad.pinst, ad.prealm);
714 make_error_reply (hdr, KABADTICKET, reply);
722 if (kdc_time > _krb5_krb_life_to_time(ad.time_sec, ad.life)) {
723 kdc_log(context, config, 0, "TGT expired: %s.%s@%s",
724 ad.pname, ad.pinst, ad.prealm);
725 make_error_reply (hdr, KABADTICKET, reply);
730 snprintf (client_name, sizeof(client_name),
731 "%s.%s@%s", ad.pname, ad.pinst, ad.prealm);
733 kdc_log(context, config, 0, "TGS-REQ (kaserver) %s from %s for %s",
734 client_name, from, server_name);
736 ret = _kdc_db_fetch4 (context, config,
737 ad.pname, ad.pinst, ad.prealm,
738 HDB_ENT_TYPE_CLIENT, &client_entry);
739 if(ret && ret != HDB_ERR_NOENTRY) {
740 kdc_log(context, config, 0,
741 "Client not found in database: (krb4) %s: %s",
742 client_name, krb5_get_err_text(context, ret));
743 make_error_reply (hdr, KANOENT, reply);
746 if (client_entry == NULL && strcmp(ad.prealm, config->v4_realm) == 0) {
747 kdc_log(context, config, 0,
748 "Local client not found in database: (krb4) "
750 make_error_reply (hdr, KANOENT, reply);
754 ret = _kdc_check_flags (context, config,
755 client_entry, client_name,
756 server_entry, server_name,
759 make_error_reply (hdr, KAPWEXPIRED, reply);
763 /* decrypt the times */
764 memcpy(&session, ad.session.keyvalue.data, sizeof(session));
765 DES_set_key (&session, &schedule);
766 DES_ecb_encrypt (times.data,
770 memset (&schedule, 0, sizeof(schedule));
771 memset (&session, 0, sizeof(session));
773 /* and extract them */
778 tsp = krb5_storage_from_mem (times.data, times.length);
779 krb5_ret_int32 (tsp, &tmp);
781 krb5_ret_int32 (tsp, &tmp);
783 krb5_storage_free (tsp);
787 max_life = end_time - kdc_time;
788 /* end_time - kdc_time can sometimes be non-positive due to slight
789 time skew between client and server. Let's make sure it is postive */
792 if (krbtgt_entry->max_life)
793 max_life = min(max_life, *krbtgt_entry->max_life);
794 if (server_entry->max_life)
795 max_life = min(max_life, *server_entry->max_life);
796 /* if this is a cross realm request, the client_entry will likely
798 if (client_entry && client_entry->max_life)
799 max_life = min(max_life, *client_entry->max_life);
801 life = _krb5_krb_time_to_life(kdc_time, kdc_time + max_life);
803 create_reply_ticket (context,
805 ad.pname, ad.pinst, ad.prealm,
806 addr, life, server_entry->kvno,
813 _krb5_krb_free_auth_data(context, &ad);
814 if (aticket.length) {
815 memset (aticket.data, 0, aticket.length);
816 krb5_data_free (&aticket);
819 memset (times.data, 0, times.length);
820 krb5_data_free (×);
829 _kdc_free_ent (context, krbtgt_entry);
831 _kdc_free_ent (context, server_entry);
835 _kdc_do_kaserver(krb5_context context,
836 krb5_kdc_configuration *config,
841 struct sockaddr_in *addr)
843 krb5_error_code ret = 0;
844 struct rx_header hdr;
848 if (len < RX_HEADER_SIZE)
850 sp = krb5_storage_from_mem (buf, len);
852 decode_rx_header (sp, &hdr);
853 buf += RX_HEADER_SIZE;
854 len -= RX_HEADER_SIZE;
872 if (hdr.serviceid != KA_AUTHENTICATION_SERVICE
873 && hdr.serviceid != KA_TICKET_GRANTING_SERVICE) {
878 krb5_ret_int32(sp, &op);
881 case AUTHENTICATE_V2 :
882 do_authenticate (context, config, &hdr, sp, addr, from, reply);
885 do_getticket (context, config, &hdr, sp, addr, from, reply);
887 case AUTHENTICATE_OLD :
888 case CHANGEPASSWORD :
901 make_error_reply (&hdr, RXGEN_OPCODE, reply);
906 krb5_storage_free (sp);