1 /*
2 * Copyright (c) 1997 - 2006 Kungliga Tekniska H�gskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 *
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.
16 *
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.
20 *
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
31 * SUCH DAMAGE.
32 */
33
34 #include "kdc_locl.h"
35
36 #include <krb5-v4compat.h>
37
38 RCSID("$Id: kerberos4.c 21577 2007-07-16 08:14:06Z lha $");
39
40 #ifndef swap32
41 static uint32_t
swap32(uint32_t x)42 swap32(uint32_t x)
43 {
44 return ((x << 24) & 0xff000000) |
45 ((x << 8) & 0xff0000) |
46 ((x >> 8) & 0xff00) |
47 ((x >> 24) & 0xff);
48 }
49 #endif /* swap32 */
50
51 int
_kdc_maybe_version4(unsigned char * buf,int len)52 _kdc_maybe_version4(unsigned char *buf, int len)
53 {
54 return len > 0 && *buf == 4;
55 }
56
57 static void
make_err_reply(krb5_context context,krb5_data * reply,int code,const char * msg)58 make_err_reply(krb5_context context, krb5_data *reply,
59 int code, const char *msg)
60 {
61 _krb5_krb_cr_err_reply(context, "", "", "",
62 kdc_time, code, msg, reply);
63 }
64
65 struct valid_princ_ctx {
66 krb5_kdc_configuration *config;
67 unsigned flags;
68 };
69
70 static krb5_boolean
valid_princ(krb5_context context,void * funcctx,krb5_principal princ)71 valid_princ(krb5_context context,
72 void *funcctx,
73 krb5_principal princ)
74 {
75 struct valid_princ_ctx *ctx = funcctx;
76 krb5_error_code ret;
77 char *s;
78 hdb_entry_ex *ent;
79
80 ret = krb5_unparse_name(context, princ, &s);
81 if (ret)
82 return FALSE;
83 ret = _kdc_db_fetch(context, ctx->config, princ, ctx->flags, NULL, &ent);
84 if (ret) {
85 kdc_log(context, ctx->config, 7, "Lookup %s failed: %s", s,
86 krb5_get_err_text (context, ret));
87 free(s);
88 return FALSE;
89 }
90 kdc_log(context, ctx->config, 7, "Lookup %s succeeded", s);
91 free(s);
92 _kdc_free_ent(context, ent);
93 return TRUE;
94 }
95
96 krb5_error_code
_kdc_db_fetch4(krb5_context context,krb5_kdc_configuration * config,const char * name,const char * instance,const char * realm,unsigned flags,hdb_entry_ex ** ent)97 _kdc_db_fetch4(krb5_context context,
98 krb5_kdc_configuration *config,
99 const char *name, const char *instance, const char *realm,
100 unsigned flags,
101 hdb_entry_ex **ent)
102 {
103 krb5_principal p;
104 krb5_error_code ret;
105 struct valid_princ_ctx ctx;
106
107 ctx.config = config;
108 ctx.flags = flags;
109
110 ret = krb5_425_conv_principal_ext2(context, name, instance, realm,
111 valid_princ, &ctx, 0, &p);
112 if(ret)
113 return ret;
114 ret = _kdc_db_fetch(context, config, p, flags, NULL, ent);
115 krb5_free_principal(context, p);
116 return ret;
117 }
118
119 #define RCHECK(X, L) if(X){make_err_reply(context, reply, KFAILURE, "Packet too short"); goto L;}
120
121 /*
122 * Process the v4 request in `buf, len' (received from `addr'
123 * (with string `from').
124 * Return an error code and a reply in `reply'.
125 */
126
127 krb5_error_code
_kdc_do_version4(krb5_context context,krb5_kdc_configuration * config,unsigned char * buf,size_t len,krb5_data * reply,const char * from,struct sockaddr_in * addr)128 _kdc_do_version4(krb5_context context,
129 krb5_kdc_configuration *config,
130 unsigned char *buf,
131 size_t len,
132 krb5_data *reply,
133 const char *from,
134 struct sockaddr_in *addr)
135 {
136 krb5_storage *sp;
137 krb5_error_code ret;
138 hdb_entry_ex *client = NULL, *server = NULL;
139 Key *ckey, *skey;
140 int8_t pvno;
141 int8_t msg_type;
142 int lsb;
143 char *name = NULL, *inst = NULL, *realm = NULL;
144 char *sname = NULL, *sinst = NULL;
145 int32_t req_time;
146 time_t max_life;
147 uint8_t life;
148 char client_name[256];
149 char server_name[256];
150
151 if(!config->enable_v4) {
152 kdc_log(context, config, 0,
153 "Rejected version 4 request from %s", from);
154 make_err_reply(context, reply, KRB4ET_KDC_GEN_ERR,
155 "Function not enabled");
156 return 0;
157 }
158
159 sp = krb5_storage_from_mem(buf, len);
160 RCHECK(krb5_ret_int8(sp, &pvno), out);
161 if(pvno != 4){
162 kdc_log(context, config, 0,
163 "Protocol version mismatch (krb4) (%d)", pvno);
164 make_err_reply(context, reply, KRB4ET_KDC_PKT_VER, "protocol mismatch");
165 goto out;
166 }
167 RCHECK(krb5_ret_int8(sp, &msg_type), out);
168 lsb = msg_type & 1;
169 msg_type &= ~1;
170 switch(msg_type){
171 case AUTH_MSG_KDC_REQUEST: {
172 krb5_data ticket, cipher;
173 krb5_keyblock session;
174
175 krb5_data_zero(&ticket);
176 krb5_data_zero(&cipher);
177
178 RCHECK(krb5_ret_stringz(sp, &name), out1);
179 RCHECK(krb5_ret_stringz(sp, &inst), out1);
180 RCHECK(krb5_ret_stringz(sp, &realm), out1);
181 RCHECK(krb5_ret_int32(sp, &req_time), out1);
182 if(lsb)
183 req_time = swap32(req_time);
184 RCHECK(krb5_ret_uint8(sp, &life), out1);
185 RCHECK(krb5_ret_stringz(sp, &sname), out1);
186 RCHECK(krb5_ret_stringz(sp, &sinst), out1);
187 snprintf (client_name, sizeof(client_name),
188 "%s.%s@%s", name, inst, realm);
189 snprintf (server_name, sizeof(server_name),
190 "%s.%s@%s", sname, sinst, config->v4_realm);
191
192 kdc_log(context, config, 0, "AS-REQ (krb4) %s from %s for %s",
193 client_name, from, server_name);
194
195 ret = _kdc_db_fetch4(context, config, name, inst, realm,
196 HDB_F_GET_CLIENT, &client);
197 if(ret) {
198 kdc_log(context, config, 0, "Client not found in database: %s: %s",
199 client_name, krb5_get_err_text(context, ret));
200 make_err_reply(context, reply, KRB4ET_KDC_PR_UNKNOWN,
201 "principal unknown");
202 goto out1;
203 }
204 ret = _kdc_db_fetch4(context, config, sname, sinst, config->v4_realm,
205 HDB_F_GET_SERVER, &server);
206 if(ret){
207 kdc_log(context, config, 0, "Server not found in database: %s: %s",
208 server_name, krb5_get_err_text(context, ret));
209 make_err_reply(context, reply, KRB4ET_KDC_PR_UNKNOWN,
210 "principal unknown");
211 goto out1;
212 }
213
214 ret = _kdc_check_flags (context, config,
215 client, client_name,
216 server, server_name,
217 TRUE);
218 if (ret) {
219 /* good error code? */
220 make_err_reply(context, reply, KRB4ET_KDC_NAME_EXP,
221 "operation not allowed");
222 goto out1;
223 }
224
225 if (config->enable_v4_per_principal &&
226 client->entry.flags.allow_kerberos4 == 0)
227 {
228 kdc_log(context, config, 0,
229 "Per principal Kerberos 4 flag not turned on for %s",
230 client_name);
231 make_err_reply(context, reply, KRB4ET_KDC_NULL_KEY,
232 "allow kerberos4 flag required");
233 goto out1;
234 }
235
236 /*
237 * There's no way to do pre-authentication in v4 and thus no
238 * good error code to return if preauthentication is required.
239 */
240
241 if (config->require_preauth
242 || client->entry.flags.require_preauth
243 || server->entry.flags.require_preauth) {
244 kdc_log(context, config, 0,
245 "Pre-authentication required for v4-request: "
246 "%s for %s",
247 client_name, server_name);
248 make_err_reply(context, reply, KRB4ET_KDC_NULL_KEY,
249 "preauth required");
250 goto out1;
251 }
252
253 ret = _kdc_get_des_key(context, client, FALSE, FALSE, &ckey);
254 if(ret){
255 kdc_log(context, config, 0, "no suitable DES key for client");
256 make_err_reply(context, reply, KRB4ET_KDC_NULL_KEY,
257 "no suitable DES key for client");
258 goto out1;
259 }
260
261 #if 0
262 /* this is not necessary with the new code in libkrb */
263 /* find a properly salted key */
264 while(ckey->salt == NULL || ckey->salt->salt.length != 0)
265 ret = hdb_next_keytype2key(context, &client->entry, KEYTYPE_DES, &ckey);
266 if(ret){
267 kdc_log(context, config, 0, "No version-4 salted key in database -- %s.%s@%s",
268 name, inst, realm);
269 make_err_reply(context, reply, KRB4ET_KDC_NULL_KEY,
270 "No version-4 salted key in database");
271 goto out1;
272 }
273 #endif
274
275 ret = _kdc_get_des_key(context, server, TRUE, FALSE, &skey);
276 if(ret){
277 kdc_log(context, config, 0, "no suitable DES key for server");
278 make_err_reply(context, reply, KRB4ET_KDC_NULL_KEY,
279 "no suitable DES key for server");
280 goto out1;
281 }
282
283 max_life = _krb5_krb_life_to_time(0, life);
284 if(client->entry.max_life)
285 max_life = min(max_life, *client->entry.max_life);
286 if(server->entry.max_life)
287 max_life = min(max_life, *server->entry.max_life);
288
289 life = krb_time_to_life(kdc_time, kdc_time + max_life);
290
291 ret = krb5_generate_random_keyblock(context,
292 ETYPE_DES_PCBC_NONE,
293 &session);
294 if (ret) {
295 make_err_reply(context, reply, KFAILURE,
296 "Not enough random i KDC");
297 goto out1;
298 }
299
300 ret = _krb5_krb_create_ticket(context,
301 0,
302 name,
303 inst,
304 config->v4_realm,
305 addr->sin_addr.s_addr,
306 &session,
307 life,
308 kdc_time,
309 sname,
310 sinst,
311 &skey->key,
312 &ticket);
313 if (ret) {
314 krb5_free_keyblock_contents(context, &session);
315 make_err_reply(context, reply, KFAILURE,
316 "failed to create v4 ticket");
317 goto out1;
318 }
319
320 ret = _krb5_krb_create_ciph(context,
321 &session,
322 sname,
323 sinst,
324 config->v4_realm,
325 life,
326 server->entry.kvno % 255,
327 &ticket,
328 kdc_time,
329 &ckey->key,
330 &cipher);
331 krb5_free_keyblock_contents(context, &session);
332 krb5_data_free(&ticket);
333 if (ret) {
334 make_err_reply(context, reply, KFAILURE,
335 "Failed to create v4 cipher");
336 goto out1;
337 }
338
339 ret = _krb5_krb_create_auth_reply(context,
340 name,
341 inst,
342 realm,
343 req_time,
344 0,
345 client->entry.pw_end ? *client->entry.pw_end : 0,
346 client->entry.kvno % 256,
347 &cipher,
348 reply);
349 krb5_data_free(&cipher);
350
351 out1:
352 break;
353 }
354 case AUTH_MSG_APPL_REQUEST: {
355 struct _krb5_krb_auth_data ad;
356 int8_t kvno;
357 int8_t ticket_len;
358 int8_t req_len;
359 krb5_data auth;
360 int32_t address;
361 size_t pos;
362 krb5_principal tgt_princ = NULL;
363 hdb_entry_ex *tgt = NULL;
364 Key *tkey;
365 time_t max_end, actual_end, issue_time;
366
367 memset(&ad, 0, sizeof(ad));
368 krb5_data_zero(&auth);
369
370 RCHECK(krb5_ret_int8(sp, &kvno), out2);
371 RCHECK(krb5_ret_stringz(sp, &realm), out2);
372
373 ret = krb5_425_conv_principal(context, "krbtgt", realm,
374 config->v4_realm,
375 &tgt_princ);
376 if(ret){
377 kdc_log(context, config, 0,
378 "Converting krbtgt principal (krb4): %s",
379 krb5_get_err_text(context, ret));
380 make_err_reply(context, reply, KFAILURE,
381 "Failed to convert v4 principal (krbtgt)");
382 goto out2;
383 }
384
385 ret = _kdc_db_fetch(context, config, tgt_princ,
386 HDB_F_GET_KRBTGT, NULL, &tgt);
387 if(ret){
388 char *s;
389 s = kdc_log_msg(context, config, 0, "Ticket-granting ticket not "
390 "found in database (krb4): krbtgt.%s@%s: %s",
391 realm, config->v4_realm,
392 krb5_get_err_text(context, ret));
393 make_err_reply(context, reply, KFAILURE, s);
394 free(s);
395 goto out2;
396 }
397
398 if(tgt->entry.kvno % 256 != kvno){
399 kdc_log(context, config, 0,
400 "tgs-req (krb4) with old kvno %d (current %d) for "
401 "krbtgt.%s@%s", kvno, tgt->entry.kvno % 256,
402 realm, config->v4_realm);
403 make_err_reply(context, reply, KRB4ET_KDC_AUTH_EXP,
404 "old krbtgt kvno used");
405 goto out2;
406 }
407
408 ret = _kdc_get_des_key(context, tgt, TRUE, FALSE, &tkey);
409 if(ret){
410 kdc_log(context, config, 0,
411 "no suitable DES key for krbtgt (krb4)");
412 make_err_reply(context, reply, KRB4ET_KDC_NULL_KEY,
413 "no suitable DES key for krbtgt");
414 goto out2;
415 }
416
417 RCHECK(krb5_ret_int8(sp, &ticket_len), out2);
418 RCHECK(krb5_ret_int8(sp, &req_len), out2);
419
420 pos = krb5_storage_seek(sp, ticket_len + req_len, SEEK_CUR);
421
422 auth.data = buf;
423 auth.length = pos;
424
425 if (config->check_ticket_addresses)
426 address = addr->sin_addr.s_addr;
427 else
428 address = 0;
429
430 ret = _krb5_krb_rd_req(context, &auth, "krbtgt", realm,
431 config->v4_realm,
432 address, &tkey->key, &ad);
433 if(ret){
434 kdc_log(context, config, 0, "krb_rd_req: %d", ret);
435 make_err_reply(context, reply, ret, "failed to parse request");
436 goto out2;
437 }
438
439 RCHECK(krb5_ret_int32(sp, &req_time), out2);
440 if(lsb)
441 req_time = swap32(req_time);
442 RCHECK(krb5_ret_uint8(sp, &life), out2);
443 RCHECK(krb5_ret_stringz(sp, &sname), out2);
444 RCHECK(krb5_ret_stringz(sp, &sinst), out2);
445 snprintf (server_name, sizeof(server_name),
446 "%s.%s@%s",
447 sname, sinst, config->v4_realm);
448 snprintf (client_name, sizeof(client_name),
449 "%s.%s@%s",
450 ad.pname, ad.pinst, ad.prealm);
451
452 kdc_log(context, config, 0, "TGS-REQ (krb4) %s from %s for %s",
453 client_name, from, server_name);
454
455 if(strcmp(ad.prealm, realm)){
456 kdc_log(context, config, 0,
457 "Can't hop realms (krb4) %s -> %s", realm, ad.prealm);
458 make_err_reply(context, reply, KRB4ET_KDC_PR_UNKNOWN,
459 "Can't hop realms");
460 goto out2;
461 }
462
463 if (!config->enable_v4_cross_realm && strcmp(realm, config->v4_realm) != 0) {
464 kdc_log(context, config, 0,
465 "krb4 Cross-realm %s -> %s disabled",
466 realm, config->v4_realm);
467 make_err_reply(context, reply, KRB4ET_KDC_PR_UNKNOWN,
468 "Can't hop realms");
469 goto out2;
470 }
471
472 if(strcmp(sname, "changepw") == 0){
473 kdc_log(context, config, 0,
474 "Bad request for changepw ticket (krb4)");
475 make_err_reply(context, reply, KRB4ET_KDC_PR_UNKNOWN,
476 "Can't authorize password change based on TGT");
477 goto out2;
478 }
479
480 ret = _kdc_db_fetch4(context, config, ad.pname, ad.pinst, ad.prealm,
481 HDB_F_GET_CLIENT, &client);
482 if(ret && ret != HDB_ERR_NOENTRY) {
483 char *s;
484 s = kdc_log_msg(context, config, 0,
485 "Client not found in database: (krb4) %s: %s",
486 client_name, krb5_get_err_text(context, ret));
487 make_err_reply(context, reply, KRB4ET_KDC_PR_UNKNOWN, s);
488 free(s);
489 goto out2;
490 }
491 if (client == NULL && strcmp(ad.prealm, config->v4_realm) == 0) {
492 char *s;
493 s = kdc_log_msg(context, config, 0,
494 "Local client not found in database: (krb4) "
495 "%s", client_name);
496 make_err_reply(context, reply, KRB4ET_KDC_PR_UNKNOWN, s);
497 free(s);
498 goto out2;
499 }
500
501 ret = _kdc_db_fetch4(context, config, sname, sinst, config->v4_realm,
502 HDB_F_GET_SERVER, &server);
503 if(ret){
504 char *s;
505 s = kdc_log_msg(context, config, 0,
506 "Server not found in database (krb4): %s: %s",
507 server_name, krb5_get_err_text(context, ret));
508 make_err_reply(context, reply, KRB4ET_KDC_PR_UNKNOWN, s);
509 free(s);
510 goto out2;
511 }
512
513 ret = _kdc_check_flags (context, config,
514 client, client_name,
515 server, server_name,
516 FALSE);
517 if (ret) {
518 make_err_reply(context, reply, KRB4ET_KDC_NAME_EXP,
519 "operation not allowed");
520 goto out2;
521 }
522
523 ret = _kdc_get_des_key(context, server, TRUE, FALSE, &skey);
524 if(ret){
525 kdc_log(context, config, 0,
526 "no suitable DES key for server (krb4)");
527 make_err_reply(context, reply, KRB4ET_KDC_NULL_KEY,
528 "no suitable DES key for server");
529 goto out2;
530 }
531
532 max_end = _krb5_krb_life_to_time(ad.time_sec, ad.life);
533 max_end = min(max_end, _krb5_krb_life_to_time(kdc_time, life));
534 if(server->entry.max_life)
535 max_end = min(max_end, kdc_time + *server->entry.max_life);
536 if(client && client->entry.max_life)
537 max_end = min(max_end, kdc_time + *client->entry.max_life);
538 life = min(life, krb_time_to_life(kdc_time, max_end));
539
540 issue_time = kdc_time;
541 actual_end = _krb5_krb_life_to_time(issue_time, life);
542 while (actual_end > max_end && life > 1) {
543 /* move them into the next earlier lifetime bracket */
544 life--;
545 actual_end = _krb5_krb_life_to_time(issue_time, life);
546 }
547 if (actual_end > max_end) {
548 /* if life <= 1 and it's still too long, backdate the ticket */
549 issue_time -= actual_end - max_end;
550 }
551
552 {
553 krb5_data ticket, cipher;
554 krb5_keyblock session;
555
556 krb5_data_zero(&ticket);
557 krb5_data_zero(&cipher);
558
559 ret = krb5_generate_random_keyblock(context,
560 ETYPE_DES_PCBC_NONE,
561 &session);
562 if (ret) {
563 make_err_reply(context, reply, KFAILURE,
564 "Not enough random i KDC");
565 goto out2;
566 }
567
568 ret = _krb5_krb_create_ticket(context,
569 0,
570 ad.pname,
571 ad.pinst,
572 ad.prealm,
573 addr->sin_addr.s_addr,
574 &session,
575 life,
576 issue_time,
577 sname,
578 sinst,
579 &skey->key,
580 &ticket);
581 if (ret) {
582 krb5_free_keyblock_contents(context, &session);
583 make_err_reply(context, reply, KFAILURE,
584 "failed to create v4 ticket");
585 goto out2;
586 }
587
588 ret = _krb5_krb_create_ciph(context,
589 &session,
590 sname,
591 sinst,
592 config->v4_realm,
593 life,
594 server->entry.kvno % 255,
595 &ticket,
596 issue_time,
597 &ad.session,
598 &cipher);
599 krb5_free_keyblock_contents(context, &session);
600 if (ret) {
601 make_err_reply(context, reply, KFAILURE,
602 "failed to create v4 cipher");
603 goto out2;
604 }
605
606 ret = _krb5_krb_create_auth_reply(context,
607 ad.pname,
608 ad.pinst,
609 ad.prealm,
610 req_time,
611 0,
612 0,
613 0,
614 &cipher,
615 reply);
616 krb5_data_free(&cipher);
617 }
618 out2:
619 _krb5_krb_free_auth_data(context, &ad);
620 if(tgt_princ)
621 krb5_free_principal(context, tgt_princ);
622 if(tgt)
623 _kdc_free_ent(context, tgt);
624 break;
625 }
626 case AUTH_MSG_ERR_REPLY:
627 break;
628 default:
629 kdc_log(context, config, 0, "Unknown message type (krb4): %d from %s",
630 msg_type, from);
631
632 make_err_reply(context, reply, KFAILURE, "Unknown message type");
633 }
634 out:
635 if(name)
636 free(name);
637 if(inst)
638 free(inst);
639 if(realm)
640 free(realm);
641 if(sname)
642 free(sname);
643 if(sinst)
644 free(sinst);
645 if(client)
646 _kdc_free_ent(context, client);
647 if(server)
648 _kdc_free_ent(context, server);
649 krb5_storage_free(sp);
650 return 0;
651 }
652
653 krb5_error_code
_kdc_encode_v4_ticket(krb5_context context,krb5_kdc_configuration * config,void * buf,size_t len,const EncTicketPart * et,const PrincipalName * service,size_t * size)654 _kdc_encode_v4_ticket(krb5_context context,
655 krb5_kdc_configuration *config,
656 void *buf, size_t len, const EncTicketPart *et,
657 const PrincipalName *service, size_t *size)
658 {
659 krb5_storage *sp;
660 krb5_error_code ret;
661 char name[40], inst[40], realm[40];
662 char sname[40], sinst[40];
663
664 {
665 krb5_principal princ;
666 _krb5_principalname2krb5_principal(context,
667 &princ,
668 *service,
669 et->crealm);
670 ret = krb5_524_conv_principal(context,
671 princ,
672 sname,
673 sinst,
674 realm);
675 krb5_free_principal(context, princ);
676 if(ret)
677 return ret;
678
679 _krb5_principalname2krb5_principal(context,
680 &princ,
681 et->cname,
682 et->crealm);
683
684 ret = krb5_524_conv_principal(context,
685 princ,
686 name,
687 inst,
688 realm);
689 krb5_free_principal(context, princ);
690 }
691 if(ret)
692 return ret;
693
694 sp = krb5_storage_emem();
695
696 krb5_store_int8(sp, 0); /* flags */
697 krb5_store_stringz(sp, name);
698 krb5_store_stringz(sp, inst);
699 krb5_store_stringz(sp, realm);
700 {
701 unsigned char tmp[4] = { 0, 0, 0, 0 };
702 int i;
703 if(et->caddr){
704 for(i = 0; i < et->caddr->len; i++)
705 if(et->caddr->val[i].addr_type == AF_INET &&
706 et->caddr->val[i].address.length == 4){
707 memcpy(tmp, et->caddr->val[i].address.data, 4);
708 break;
709 }
710 }
711 krb5_storage_write(sp, tmp, sizeof(tmp));
712 }
713
714 if((et->key.keytype != ETYPE_DES_CBC_MD5 &&
715 et->key.keytype != ETYPE_DES_CBC_MD4 &&
716 et->key.keytype != ETYPE_DES_CBC_CRC) ||
717 et->key.keyvalue.length != 8)
718 return -1;
719 krb5_storage_write(sp, et->key.keyvalue.data, 8);
720
721 {
722 time_t start = et->starttime ? *et->starttime : et->authtime;
723 krb5_store_int8(sp, krb_time_to_life(start, et->endtime));
724 krb5_store_int32(sp, start);
725 }
726
727 krb5_store_stringz(sp, sname);
728 krb5_store_stringz(sp, sinst);
729
730 {
731 krb5_data data;
732 krb5_storage_to_data(sp, &data);
733 krb5_storage_free(sp);
734 *size = (data.length + 7) & ~7; /* pad to 8 bytes */
735 if(*size > len)
736 return -1;
737 memset((unsigned char*)buf - *size + 1, 0, *size);
738 memcpy((unsigned char*)buf - *size + 1, data.data, data.length);
739 krb5_data_free(&data);
740 }
741 return 0;
742 }
743
744 krb5_error_code
_kdc_get_des_key(krb5_context context,hdb_entry_ex * principal,krb5_boolean is_server,krb5_boolean prefer_afs_key,Key ** ret_key)745 _kdc_get_des_key(krb5_context context,
746 hdb_entry_ex *principal, krb5_boolean is_server,
747 krb5_boolean prefer_afs_key, Key **ret_key)
748 {
749 Key *v5_key = NULL, *v4_key = NULL, *afs_key = NULL, *server_key = NULL;
750 int i;
751 krb5_enctype etypes[] = { ETYPE_DES_CBC_MD5,
752 ETYPE_DES_CBC_MD4,
753 ETYPE_DES_CBC_CRC };
754
755 for(i = 0;
756 i < sizeof(etypes)/sizeof(etypes[0])
757 && (v5_key == NULL || v4_key == NULL ||
758 afs_key == NULL || server_key == NULL);
759 ++i) {
760 Key *key = NULL;
761 while(hdb_next_enctype2key(context, &principal->entry, etypes[i], &key) == 0) {
762 if(key->salt == NULL) {
763 if(v5_key == NULL)
764 v5_key = key;
765 } else if(key->salt->type == hdb_pw_salt &&
766 key->salt->salt.length == 0) {
767 if(v4_key == NULL)
768 v4_key = key;
769 } else if(key->salt->type == hdb_afs3_salt) {
770 if(afs_key == NULL)
771 afs_key = key;
772 } else if(server_key == NULL)
773 server_key = key;
774 }
775 }
776
777 if(prefer_afs_key) {
778 if(afs_key)
779 *ret_key = afs_key;
780 else if(v4_key)
781 *ret_key = v4_key;
782 else if(v5_key)
783 *ret_key = v5_key;
784 else if(is_server && server_key)
785 *ret_key = server_key;
786 else
787 return KRB4ET_KDC_NULL_KEY;
788 } else {
789 if(v4_key)
790 *ret_key = v4_key;
791 else if(afs_key)
792 *ret_key = afs_key;
793 else if(v5_key)
794 *ret_key = v5_key;
795 else if(is_server && server_key)
796 *ret_key = server_key;
797 else
798 return KRB4ET_KDC_NULL_KEY;
799 }
800
801 if((*ret_key)->key.keyvalue.length == 0)
802 return KRB4ET_KDC_NULL_KEY;
803 return 0;
804 }
805
806