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
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
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_error_code KRB5_LIB_FUNCTION
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_error_code KRB5_LIB_FUNCTION
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
);