2 * Copyright (c) 1997 - 2006 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.
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23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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36 #include <krb5-v4compat.h>
38 RCSID("$Id: kerberos4.c 21577 2007-07-16 08:14:06Z lha $");
44 return ((x << 24) & 0xff000000) |
45 ((x << 8) & 0xff0000) |
52 _kdc_maybe_version4(unsigned char *buf, int len)
54 return len > 0 && *buf == 4;
58 make_err_reply(krb5_context context, krb5_data *reply,
59 int code, const char *msg)
61 _krb5_krb_cr_err_reply(context, "", "", "",
62 kdc_time, code, msg, reply);
65 struct valid_princ_ctx {
66 krb5_kdc_configuration *config;
71 valid_princ(krb5_context context,
75 struct valid_princ_ctx *ctx = funcctx;
80 ret = krb5_unparse_name(context, princ, &s);
83 ret = _kdc_db_fetch(context, ctx->config, princ, ctx->flags, NULL, &ent);
85 kdc_log(context, ctx->config, 7, "Lookup %s failed: %s", s,
86 krb5_get_err_text (context, ret));
90 kdc_log(context, ctx->config, 7, "Lookup %s succeeded", s);
92 _kdc_free_ent(context, ent);
97 _kdc_db_fetch4(krb5_context context,
98 krb5_kdc_configuration *config,
99 const char *name, const char *instance, const char *realm,
105 struct valid_princ_ctx ctx;
110 ret = krb5_425_conv_principal_ext2(context, name, instance, realm,
111 valid_princ, &ctx, 0, &p);
114 ret = _kdc_db_fetch(context, config, p, flags, NULL, ent);
115 krb5_free_principal(context, p);
119 #define RCHECK(X, L) if(X){make_err_reply(context, reply, KFAILURE, "Packet too short"); goto L;}
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'.
128 _kdc_do_version4(krb5_context context,
129 krb5_kdc_configuration *config,
134 struct sockaddr_in *addr)
138 hdb_entry_ex *client = NULL, *server = NULL;
143 char *name = NULL, *inst = NULL, *realm = NULL;
144 char *sname = NULL, *sinst = NULL;
148 char client_name[256];
149 char server_name[256];
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");
159 sp = krb5_storage_from_mem(buf, len);
160 RCHECK(krb5_ret_int8(sp, &pvno), out);
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");
167 RCHECK(krb5_ret_int8(sp, &msg_type), out);
171 case AUTH_MSG_KDC_REQUEST: {
172 krb5_data ticket, cipher;
173 krb5_keyblock session;
175 krb5_data_zero(&ticket);
176 krb5_data_zero(&cipher);
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);
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);
192 kdc_log(context, config, 0, "AS-REQ (krb4) %s from %s for %s",
193 client_name, from, server_name);
195 ret = _kdc_db_fetch4(context, config, name, inst, realm,
196 HDB_F_GET_CLIENT, &client);
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");
204 ret = _kdc_db_fetch4(context, config, sname, sinst, config->v4_realm,
205 HDB_F_GET_SERVER, &server);
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");
214 ret = _kdc_check_flags (context, config,
219 /* good error code? */
220 make_err_reply(context, reply, KRB4ET_KDC_NAME_EXP,
221 "operation not allowed");
225 if (config->enable_v4_per_principal &&
226 client->entry.flags.allow_kerberos4 == 0)
228 kdc_log(context, config, 0,
229 "Per principal Kerberos 4 flag not turned on for %s",
231 make_err_reply(context, reply, KRB4ET_KDC_NULL_KEY,
232 "allow kerberos4 flag required");
237 * There's no way to do pre-authentication in v4 and thus no
238 * good error code to return if preauthentication is required.
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: "
247 client_name, server_name);
248 make_err_reply(context, reply, KRB4ET_KDC_NULL_KEY,
253 ret = _kdc_get_des_key(context, client, FALSE, FALSE, &ckey);
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");
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);
267 kdc_log(context, config, 0, "No version-4 salted key in database -- %s.%s@%s",
269 make_err_reply(context, reply, KRB4ET_KDC_NULL_KEY,
270 "No version-4 salted key in database");
275 ret = _kdc_get_des_key(context, server, TRUE, FALSE, &skey);
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");
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);
289 life = krb_time_to_life(kdc_time, kdc_time + max_life);
291 ret = krb5_generate_random_keyblock(context,
295 make_err_reply(context, reply, KFAILURE,
296 "Not enough random i KDC");
300 ret = _krb5_krb_create_ticket(context,
305 addr->sin_addr.s_addr,
314 krb5_free_keyblock_contents(context, &session);
315 make_err_reply(context, reply, KFAILURE,
316 "failed to create v4 ticket");
320 ret = _krb5_krb_create_ciph(context,
326 server->entry.kvno % 255,
331 krb5_free_keyblock_contents(context, &session);
332 krb5_data_free(&ticket);
334 make_err_reply(context, reply, KFAILURE,
335 "Failed to create v4 cipher");
339 ret = _krb5_krb_create_auth_reply(context,
345 client->entry.pw_end ? *client->entry.pw_end : 0,
346 client->entry.kvno % 256,
349 krb5_data_free(&cipher);
354 case AUTH_MSG_APPL_REQUEST: {
355 struct _krb5_krb_auth_data ad;
362 krb5_principal tgt_princ = NULL;
363 hdb_entry_ex *tgt = NULL;
365 time_t max_end, actual_end, issue_time;
367 memset(&ad, 0, sizeof(ad));
368 krb5_data_zero(&auth);
370 RCHECK(krb5_ret_int8(sp, &kvno), out2);
371 RCHECK(krb5_ret_stringz(sp, &realm), out2);
373 ret = krb5_425_conv_principal(context, "krbtgt", realm,
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)");
385 ret = _kdc_db_fetch(context, config, tgt_princ,
386 HDB_F_GET_KRBTGT, NULL, &tgt);
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);
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");
408 ret = _kdc_get_des_key(context, tgt, TRUE, FALSE, &tkey);
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");
417 RCHECK(krb5_ret_int8(sp, &ticket_len), out2);
418 RCHECK(krb5_ret_int8(sp, &req_len), out2);
420 pos = krb5_storage_seek(sp, ticket_len + req_len, SEEK_CUR);
425 if (config->check_ticket_addresses)
426 address = addr->sin_addr.s_addr;
430 ret = _krb5_krb_rd_req(context, &auth, "krbtgt", realm,
432 address, &tkey->key, &ad);
434 kdc_log(context, config, 0, "krb_rd_req: %d", ret);
435 make_err_reply(context, reply, ret, "failed to parse request");
439 RCHECK(krb5_ret_int32(sp, &req_time), out2);
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),
447 sname, sinst, config->v4_realm);
448 snprintf (client_name, sizeof(client_name),
450 ad.pname, ad.pinst, ad.prealm);
452 kdc_log(context, config, 0, "TGS-REQ (krb4) %s from %s for %s",
453 client_name, from, server_name);
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,
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,
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");
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) {
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);
491 if (client == NULL && strcmp(ad.prealm, config->v4_realm) == 0) {
493 s = kdc_log_msg(context, config, 0,
494 "Local client not found in database: (krb4) "
496 make_err_reply(context, reply, KRB4ET_KDC_PR_UNKNOWN, s);
501 ret = _kdc_db_fetch4(context, config, sname, sinst, config->v4_realm,
502 HDB_F_GET_SERVER, &server);
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);
513 ret = _kdc_check_flags (context, config,
518 make_err_reply(context, reply, KRB4ET_KDC_NAME_EXP,
519 "operation not allowed");
523 ret = _kdc_get_des_key(context, server, TRUE, FALSE, &skey);
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");
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));
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 */
545 actual_end = _krb5_krb_life_to_time(issue_time, life);
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;
553 krb5_data ticket, cipher;
554 krb5_keyblock session;
556 krb5_data_zero(&ticket);
557 krb5_data_zero(&cipher);
559 ret = krb5_generate_random_keyblock(context,
563 make_err_reply(context, reply, KFAILURE,
564 "Not enough random i KDC");
568 ret = _krb5_krb_create_ticket(context,
573 addr->sin_addr.s_addr,
582 krb5_free_keyblock_contents(context, &session);
583 make_err_reply(context, reply, KFAILURE,
584 "failed to create v4 ticket");
588 ret = _krb5_krb_create_ciph(context,
594 server->entry.kvno % 255,
599 krb5_free_keyblock_contents(context, &session);
601 make_err_reply(context, reply, KFAILURE,
602 "failed to create v4 cipher");
606 ret = _krb5_krb_create_auth_reply(context,
616 krb5_data_free(&cipher);
619 _krb5_krb_free_auth_data(context, &ad);
621 krb5_free_principal(context, tgt_princ);
623 _kdc_free_ent(context, tgt);
626 case AUTH_MSG_ERR_REPLY:
629 kdc_log(context, config, 0, "Unknown message type (krb4): %d from %s",
632 make_err_reply(context, reply, KFAILURE, "Unknown message type");
646 _kdc_free_ent(context, client);
648 _kdc_free_ent(context, server);
649 krb5_storage_free(sp);
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)
661 char name[40], inst[40], realm[40];
662 char sname[40], sinst[40];
665 krb5_principal princ;
666 _krb5_principalname2krb5_principal(context,
670 ret = krb5_524_conv_principal(context,
675 krb5_free_principal(context, princ);
679 _krb5_principalname2krb5_principal(context,
684 ret = krb5_524_conv_principal(context,
689 krb5_free_principal(context, princ);
694 sp = krb5_storage_emem();
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);
701 unsigned char tmp[4] = { 0, 0, 0, 0 };
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);
711 krb5_storage_write(sp, tmp, sizeof(tmp));
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)
719 krb5_storage_write(sp, et->key.keyvalue.data, 8);
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);
727 krb5_store_stringz(sp, sname);
728 krb5_store_stringz(sp, sinst);
732 krb5_storage_to_data(sp, &data);
733 krb5_storage_free(sp);
734 *size = (data.length + 7) & ~7; /* pad to 8 bytes */
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);
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)
749 Key *v5_key = NULL, *v4_key = NULL, *afs_key = NULL, *server_key = NULL;
751 krb5_enctype etypes[] = { ETYPE_DES_CBC_MD5,
756 i < sizeof(etypes)/sizeof(etypes[0])
757 && (v5_key == NULL || v4_key == NULL ||
758 afs_key == NULL || server_key == NULL);
761 while(hdb_next_enctype2key(context, &principal->entry, etypes[i], &key) == 0) {
762 if(key->salt == NULL) {
765 } else if(key->salt->type == hdb_pw_salt &&
766 key->salt->salt.length == 0) {
769 } else if(key->salt->type == hdb_afs3_salt) {
772 } else if(server_key == NULL)
784 else if(is_server && server_key)
785 *ret_key = server_key;
787 return KRB4ET_KDC_NULL_KEY;
795 else if(is_server && server_key)
796 *ret_key = server_key;
798 return KRB4ET_KDC_NULL_KEY;
801 if((*ret_key)->key.keyvalue.length == 0)
802 return KRB4ET_KDC_NULL_KEY;