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: 524.c,v 1.34 2005/06/30 01:47:35 lha Exp $");
38 #include <krb5-v4compat.h>
41 * fetch the server from `t', returning the name in malloced memory in
42 * `spn' and the entry itself in `server'
45 static krb5_error_code
46 fetch_server (krb5_context context,
47 krb5_kdc_configuration *config,
54 krb5_principal sprinc;
56 ret = _krb5_principalname2krb5_principal(&sprinc, t->sname, t->realm);
58 kdc_log(context, config, 0, "_krb5_principalname2krb5_principal: %s",
59 krb5_get_err_text(context, ret));
62 ret = krb5_unparse_name(context, sprinc, spn);
64 krb5_free_principal(context, sprinc);
65 kdc_log(context, config, 0, "krb5_unparse_name: %s",
66 krb5_get_err_text(context, ret));
69 ret = _kdc_db_fetch(context, config, sprinc, HDB_ENT_TYPE_SERVER, server);
70 krb5_free_principal(context, sprinc);
72 kdc_log(context, config, 0,
73 "Request to convert ticket from %s for unknown principal %s: %s",
74 from, *spn, krb5_get_err_text(context, ret));
75 if (ret == HDB_ERR_NOENTRY)
76 ret = KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN;
82 static krb5_error_code
83 log_524 (krb5_context context,
84 krb5_kdc_configuration *config,
85 const EncTicketPart *et,
89 krb5_principal client;
93 ret = _krb5_principalname2krb5_principal(&client, et->cname, et->crealm);
95 kdc_log(context, config, 0, "_krb5_principalname2krb5_principal: %s",
96 krb5_get_err_text (context, ret));
99 ret = krb5_unparse_name(context, client, &cpn);
101 krb5_free_principal(context, client);
102 kdc_log(context, config, 0, "krb5_unparse_name: %s",
103 krb5_get_err_text (context, ret));
106 kdc_log(context, config, 1, "524-REQ %s from %s for %s", cpn, from, spn);
108 krb5_free_principal(context, client);
112 static krb5_error_code
113 verify_flags (krb5_context context,
114 krb5_kdc_configuration *config,
115 const EncTicketPart *et,
118 if(et->endtime < kdc_time){
119 kdc_log(context, config, 0, "Ticket expired (%s)", spn);
120 return KRB5KRB_AP_ERR_TKT_EXPIRED;
122 if(et->flags.invalid){
123 kdc_log(context, config, 0, "Ticket not valid (%s)", spn);
124 return KRB5KRB_AP_ERR_TKT_NYV;
130 * set the `et->caddr' to the most appropriate address to use, where
131 * `addr' is the address the request was received from.
134 static krb5_error_code
135 set_address (krb5_context context,
136 krb5_kdc_configuration *config,
138 struct sockaddr *addr,
142 krb5_address *v4_addr;
144 v4_addr = malloc (sizeof(*v4_addr));
148 ret = krb5_sockaddr2address(context, addr, v4_addr);
151 kdc_log(context, config, 0, "Failed to convert address (%s)", from);
155 if (et->caddr && !krb5_address_search (context, v4_addr, et->caddr)) {
156 kdc_log(context, config, 0, "Incorrect network address (%s)", from);
157 krb5_free_address(context, v4_addr);
159 return KRB5KRB_AP_ERR_BADADDR;
161 if(v4_addr->addr_type == KRB5_ADDRESS_INET) {
162 /* we need to collapse the addresses in the ticket to a
163 single address; best guess is to use the address the
164 connection came from */
166 if (et->caddr != NULL) {
167 free_HostAddresses(et->caddr);
169 et->caddr = malloc (sizeof (*et->caddr));
170 if (et->caddr == NULL) {
171 krb5_free_address(context, v4_addr);
176 et->caddr->val = v4_addr;
179 krb5_free_address(context, v4_addr);
186 static krb5_error_code
187 encrypt_v4_ticket(krb5_context context,
188 krb5_kdc_configuration *config,
192 EncryptedData *reply)
196 ret = krb5_crypto_init(context, skey, ETYPE_DES_PCBC_NONE, &crypto);
199 kdc_log(context, config, 0, "krb5_crypto_init failed: %s",
200 krb5_get_err_text(context, ret));
204 ret = krb5_encrypt_EncryptedData(context,
211 krb5_crypto_destroy(context, crypto);
213 kdc_log(context, config, 0, "Failed to encrypt data: %s",
214 krb5_get_err_text(context, ret));
220 static krb5_error_code
221 encode_524_response(krb5_context context,
222 krb5_kdc_configuration *config,
223 const char *spn, const EncTicketPart et,
224 const Ticket *t, hdb_entry *server,
225 EncryptedData *ticket, int *kvno)
231 use_2b = krb5_config_get_bool(context, NULL, "kdc", "use_2b", spn, NULL);
233 ASN1_MALLOC_ENCODE(EncryptedData,
234 ticket->cipher.data, ticket->cipher.length,
235 &t->enc_part, &len, ret);
238 kdc_log(context, config, 0,
239 "Failed to encode v4 (2b) ticket (%s)", spn);
245 *kvno = 213; /* 2b's use this magic kvno */
247 unsigned char buf[MAX_KTXT_LEN + 4 * 4];
250 if (!config->enable_v4_cross_realm && strcmp (et.crealm, t->realm) != 0) {
251 kdc_log(context, config, 0, "524 cross-realm %s -> %s disabled", et.crealm,
253 return KRB5KDC_ERR_POLICY;
256 ret = _kdc_encode_v4_ticket(context, config,
257 buf + sizeof(buf) - 1, sizeof(buf),
258 &et, &t->sname, &len);
260 kdc_log(context, config, 0,
261 "Failed to encode v4 ticket (%s)", spn);
264 ret = _kdc_get_des_key(context, server, TRUE, FALSE, &skey);
266 kdc_log(context, config, 0,
267 "no suitable DES key for server (%s)", spn);
270 ret = encrypt_v4_ticket(context, config, buf + sizeof(buf) - len, len,
273 kdc_log(context, config, 0,
274 "Failed to encrypt v4 ticket (%s)", spn);
277 *kvno = server->kvno;
284 * process a 5->4 request, based on `t', and received `from, addr',
285 * returning the reply in `reply'
289 _kdc_do_524(krb5_context context,
290 krb5_kdc_configuration *config,
291 const Ticket *t, krb5_data *reply,
292 const char *from, struct sockaddr *addr)
294 krb5_error_code ret = 0;
296 hdb_entry *server = NULL;
300 EncryptedData ticket;
303 unsigned char buf[MAX_KTXT_LEN + 4 * 4];
307 if(!config->enable_524) {
308 ret = KRB5KDC_ERR_POLICY;
309 kdc_log(context, config, 0,
310 "Rejected ticket conversion request from %s", from);
314 ret = fetch_server (context, config, t, &spn, &server, from);
319 ret = hdb_enctype2key(context, server, t->enc_part.etype, &skey);
321 kdc_log(context, config, 0,
322 "No suitable key found for server (%s) from %s", spn, from);
325 ret = krb5_crypto_init(context, &skey->key, 0, &crypto);
327 kdc_log(context, config, 0, "krb5_crypto_init failed: %s",
328 krb5_get_err_text(context, ret));
331 ret = krb5_decrypt_EncryptedData (context,
336 krb5_crypto_destroy(context, crypto);
338 kdc_log(context, config, 0,
339 "Failed to decrypt ticket from %s for %s", from, spn);
342 ret = krb5_decode_EncTicketPart(context, et_data.data, et_data.length,
344 krb5_data_free(&et_data);
346 kdc_log(context, config, 0,
347 "Failed to decode ticket from %s for %s", from, spn);
351 ret = log_524 (context, config, &et, from, spn);
353 free_EncTicketPart(&et);
357 ret = verify_flags (context, config, &et, spn);
359 free_EncTicketPart(&et);
363 ret = set_address (context, config, &et, addr, from);
365 free_EncTicketPart(&et);
369 ret = encode_524_response(context, config, spn, et, t,
370 server, &ticket, &kvno);
371 free_EncTicketPart(&et);
375 memset(buf, 0, sizeof(buf));
376 sp = krb5_storage_from_mem(buf, sizeof(buf));
377 krb5_store_int32(sp, ret);
379 krb5_store_int32(sp, kvno);
380 krb5_store_data(sp, ticket.cipher);
381 /* Aargh! This is coded as a KTEXT_ST. */
382 krb5_storage_seek(sp, MAX_KTXT_LEN - ticket.cipher.length, SEEK_CUR);
383 krb5_store_int32(sp, 0); /* mbz */
384 free_EncryptedData(&ticket);
386 ret = krb5_storage_to_data(sp, reply);
387 reply->length = krb5_storage_seek(sp, 0, SEEK_CUR);
388 krb5_storage_free(sp);
393 _kdc_free_ent (context, server);