2 * Copyright (c) 1997 - 2004 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
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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
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30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 #include "krb5_locl.h"
36 static krb5_error_code
37 add_addrs(krb5_context context,
47 for (a = ai; a != NULL; a = a->ai_next)
50 tmp = realloc(addr->val, (addr->len + n) * sizeof(*addr->val));
51 if (tmp == NULL && (addr->len + n) != 0) {
53 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
57 for (i = addr->len; i < (addr->len + n); ++i) {
58 addr->val[i].addr_type = 0;
59 krb5_data_zero(&addr->val[i].address);
62 for (a = ai; a != NULL; a = a->ai_next) {
65 ret = krb5_sockaddr2address (context, a->ai_addr, &ad);
67 if (krb5_address_search(context, &ad, addr))
68 krb5_free_address(context, &ad);
72 else if (ret == KRB5_PROG_ATYPE_NOSUPP)
73 krb5_clear_error_message (context);
80 krb5_free_addresses (context, addr);
85 * Forward credentials for client to host hostname , making them
86 * forwardable if forwardable, and returning the blob of data to sent
87 * in out_data. If hostname == NULL, pick it from server.
89 * @param context A kerberos 5 context.
90 * @param auth_context the auth context with the key to encrypt the out_data.
91 * @param hostname the host to forward the tickets too.
92 * @param client the client to delegate from.
93 * @param server the server to delegate the credential too.
94 * @param ccache credential cache to use.
95 * @param forwardable make the forwarded ticket forwabledable.
96 * @param out_data the resulting credential.
98 * @return Return an error code or 0.
100 * @ingroup krb5_credential
103 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
104 krb5_fwd_tgt_creds (krb5_context context,
105 krb5_auth_context auth_context,
106 const char *hostname,
107 krb5_principal client,
108 krb5_principal server,
113 krb5_flags flags = 0;
116 krb5_const_realm client_realm;
118 flags |= KDC_OPT_FORWARDED;
121 flags |= KDC_OPT_FORWARDABLE;
123 if (hostname == NULL &&
124 krb5_principal_get_type(context, server) == KRB5_NT_SRV_HST) {
125 const char *inst = krb5_principal_get_comp_string(context, server, 0);
126 const char *host = krb5_principal_get_comp_string(context, server, 1);
129 strcmp(inst, "host") == 0 &&
131 krb5_principal_get_comp_string(context, server, 2) == NULL)
135 client_realm = krb5_principal_get_realm(context, client);
137 memset (&creds, 0, sizeof(creds));
138 creds.client = client;
140 ret = krb5_make_principal(context,
149 ret = krb5_get_forwarded_creds (context,
160 * Gets tickets forwarded to hostname. If the tickets that are
161 * forwarded are address-less, the forwarded tickets will also be
164 * If the ticket have any address, hostname will be used for figure
165 * out the address to forward the ticket too. This since this might
166 * use DNS, its insecure and also doesn't represent configured all
167 * addresses of the host. For example, the host might have two
168 * adresses, one IPv4 and one IPv6 address where the later is not
169 * published in DNS. This IPv6 address might be used communications
170 * and thus the resulting ticket useless.
172 * @param context A kerberos 5 context.
173 * @param auth_context the auth context with the key to encrypt the out_data.
174 * @param ccache credential cache to use
175 * @param flags the flags to control the resulting ticket flags
176 * @param hostname the host to forward the tickets too.
177 * @param in_creds the in client and server ticket names. The client
178 * and server components forwarded to the remote host.
179 * @param out_data the resulting credential.
181 * @return Return an error code or 0.
183 * @ingroup krb5_credential
186 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
187 krb5_get_forwarded_creds (krb5_context context,
188 krb5_auth_context auth_context,
191 const char *hostname,
192 krb5_creds *in_creds,
196 krb5_creds *out_creds;
197 krb5_addresses addrs, *paddrs;
199 KrbCredInfo *krb_cred_info;
200 EncKrbCredPart enc_krb_cred_part;
204 krb5_kdc_flags kdc_flags;
213 ret = krb5_get_credentials(context, 0, ccache, in_creds, &ticket);
215 if (ticket->addresses.len)
217 krb5_free_creds (context, ticket);
220 krb5_appdefault_boolean(context, NULL,
221 krb5_principal_get_realm(context,
223 "no-addresses", KRB5_ADDRESSLESS_DEFAULT,
230 * If tickets have addresses, get the address of the remote host.
233 if (paddrs != NULL) {
235 ret = getaddrinfo (hostname, NULL, NULL, &ai);
237 krb5_error_code ret2 = krb5_eai_to_heim_errno(ret, errno);
238 krb5_set_error_message(context, ret2,
239 N_("resolving host %s failed: %s",
241 hostname, gai_strerror(ret));
245 ret = add_addrs (context, &addrs, ai);
251 kdc_flags.b = int2KDCOptions(flags);
253 ret = krb5_get_kdc_cred (context,
260 krb5_free_addresses (context, &addrs);
264 memset (&cred, 0, sizeof(cred));
266 cred.msg_type = krb_cred;
267 ALLOC_SEQ(&cred.tickets, 1);
268 if (cred.tickets.val == NULL) {
270 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
273 ret = decode_Ticket(out_creds->ticket.data,
274 out_creds->ticket.length,
275 cred.tickets.val, &len);
279 memset (&enc_krb_cred_part, 0, sizeof(enc_krb_cred_part));
280 ALLOC_SEQ(&enc_krb_cred_part.ticket_info, 1);
281 if (enc_krb_cred_part.ticket_info.val == NULL) {
283 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
287 if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_TIME) {
291 krb5_us_timeofday (context, &sec, &usec);
293 ALLOC(enc_krb_cred_part.timestamp, 1);
294 if (enc_krb_cred_part.timestamp == NULL) {
296 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
299 *enc_krb_cred_part.timestamp = sec;
300 ALLOC(enc_krb_cred_part.usec, 1);
301 if (enc_krb_cred_part.usec == NULL) {
303 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
306 *enc_krb_cred_part.usec = usec;
308 enc_krb_cred_part.timestamp = NULL;
309 enc_krb_cred_part.usec = NULL;
312 if (auth_context->local_address && auth_context->local_port && paddrs) {
314 ret = krb5_make_addrport (context,
315 &enc_krb_cred_part.s_address,
316 auth_context->local_address,
317 auth_context->local_port);
322 if (auth_context->remote_address) {
323 if (auth_context->remote_port) {
325 krb5_const_realm srealm;
327 srealm = krb5_principal_get_realm(context, out_creds->server);
328 /* Is this correct, and should we use the paddrs == NULL
329 trick here as well? Having an address-less ticket may
330 indicate that we don't know our own global address, but
331 it does not necessary mean that we don't know the
333 krb5_appdefault_boolean(context, NULL, srealm, "no-addresses",
336 ret = krb5_make_addrport (context,
337 &enc_krb_cred_part.r_address,
338 auth_context->remote_address,
339 auth_context->remote_port);
344 ALLOC(enc_krb_cred_part.r_address, 1);
345 if (enc_krb_cred_part.r_address == NULL) {
347 krb5_set_error_message(context, ret,
348 N_("malloc: out of memory", ""));
352 ret = krb5_copy_address (context, auth_context->remote_address,
353 enc_krb_cred_part.r_address);
359 /* fill ticket_info.val[0] */
361 enc_krb_cred_part.ticket_info.len = 1;
363 krb_cred_info = enc_krb_cred_part.ticket_info.val;
365 copy_EncryptionKey (&out_creds->session, &krb_cred_info->key);
366 ALLOC(krb_cred_info->prealm, 1);
367 copy_Realm (&out_creds->client->realm, krb_cred_info->prealm);
368 ALLOC(krb_cred_info->pname, 1);
369 copy_PrincipalName(&out_creds->client->name, krb_cred_info->pname);
370 ALLOC(krb_cred_info->flags, 1);
371 *krb_cred_info->flags = out_creds->flags.b;
372 ALLOC(krb_cred_info->authtime, 1);
373 *krb_cred_info->authtime = out_creds->times.authtime;
374 ALLOC(krb_cred_info->starttime, 1);
375 *krb_cred_info->starttime = out_creds->times.starttime;
376 ALLOC(krb_cred_info->endtime, 1);
377 *krb_cred_info->endtime = out_creds->times.endtime;
378 ALLOC(krb_cred_info->renew_till, 1);
379 *krb_cred_info->renew_till = out_creds->times.renew_till;
380 ALLOC(krb_cred_info->srealm, 1);
381 copy_Realm (&out_creds->server->realm, krb_cred_info->srealm);
382 ALLOC(krb_cred_info->sname, 1);
383 copy_PrincipalName (&out_creds->server->name, krb_cred_info->sname);
384 ALLOC(krb_cred_info->caddr, 1);
385 copy_HostAddresses (&out_creds->addresses, krb_cred_info->caddr);
387 krb5_free_creds (context, out_creds);
389 /* encode EncKrbCredPart */
391 ASN1_MALLOC_ENCODE(EncKrbCredPart, buf, buf_size,
392 &enc_krb_cred_part, &len, ret);
393 free_EncKrbCredPart (&enc_krb_cred_part);
395 free_KRB_CRED(&cred);
399 krb5_abortx(context, "internal error in ASN.1 encoder");
402 * Some older of the MIT gssapi library used clear-text tickets
403 * (warped inside AP-REQ encryption), use the krb5_auth_context
404 * flag KRB5_AUTH_CONTEXT_CLEAR_FORWARDED_CRED to support those
405 * tickets. The session key is used otherwise to encrypt the
409 if (auth_context->flags & KRB5_AUTH_CONTEXT_CLEAR_FORWARDED_CRED) {
410 cred.enc_part.etype = ENCTYPE_NULL;
411 cred.enc_part.kvno = NULL;
412 cred.enc_part.cipher.data = buf;
413 cred.enc_part.cipher.length = buf_size;
416 * Here older versions then 0.7.2 of Heimdal used the local or
417 * remote subkey. That is wrong, the session key should be
418 * used. Heimdal 0.7.2 and newer have code to try both in the
422 ret = krb5_crypto_init(context, auth_context->keyblock, 0, &crypto);
425 free_KRB_CRED(&cred);
428 ret = krb5_encrypt_EncryptedData (context,
436 krb5_crypto_destroy(context, crypto);
438 free_KRB_CRED(&cred);
443 ASN1_MALLOC_ENCODE(KRB_CRED, buf, buf_size, &cred, &len, ret);
444 free_KRB_CRED (&cred);
448 krb5_abortx(context, "internal error in ASN.1 encoder");
449 out_data->length = len;
450 out_data->data = buf;
453 free_EncKrbCredPart(&enc_krb_cred_part);
455 free_KRB_CRED(&cred);
457 krb5_free_creds (context, out_creds);