2 * Copyright (c) 1997 - 2001, 2003 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 /* this is an attempt at one of the most horrible `compression'
37 schemes that has ever been invented; it's so amazingly brain-dead
38 that words can not describe it, and all this just to save a few
43 unsigned leading_space
:1;
44 unsigned leading_slash
:1;
45 unsigned trailing_dot
:1;
46 struct tr_realm
*next
;
50 free_realms(struct tr_realm
*r
)
62 make_path(krb5_context context
, struct tr_realm
*r
,
63 const char *from
, const char *to
)
66 struct tr_realm
*path
= r
->next
;
69 if(strlen(from
) < strlen(to
)){
76 if(strcmp(from
+ strlen(from
) - strlen(to
), to
) == 0){
81 krb5_clear_error_message (context
);
82 return KRB5KDC_ERR_POLICY
;
85 if(strcmp(p
, to
) == 0)
87 tmp
= calloc(1, sizeof(*tmp
));
89 krb5_set_error_message(context
, ENOMEM
,
90 N_("malloc: out of memory", ""));
95 path
->realm
= strdup(p
);
96 if(path
->realm
== NULL
){
97 r
->next
= path
; /* XXX */
98 krb5_set_error_message(context
, ENOMEM
,
99 N_("malloc: out of memory", ""));
103 }else if(strncmp(from
, to
, strlen(to
)) == 0){
104 p
= from
+ strlen(from
);
106 while(p
>= from
&& *p
!= '/') p
--;
108 r
->next
= path
; /* XXX */
109 return KRB5KDC_ERR_POLICY
;
111 if(strncmp(to
, from
, p
- from
) == 0)
113 tmp
= calloc(1, sizeof(*tmp
));
115 krb5_set_error_message(context
, ENOMEM
,
116 N_("malloc: out of memory", ""));
121 path
->realm
= malloc(p
- from
+ 1);
122 if(path
->realm
== NULL
){
123 r
->next
= path
; /* XXX */
124 krb5_set_error_message(context
, ENOMEM
,
125 N_("malloc: out of memory", ""));
128 memcpy(path
->realm
, from
, p
- from
);
129 path
->realm
[p
- from
] = '\0';
133 krb5_clear_error_message (context
);
134 return KRB5KDC_ERR_POLICY
;
142 make_paths(krb5_context context
,
143 struct tr_realm
*realms
, const char *client_realm
,
144 const char *server_realm
)
148 const char *prev_realm
= client_realm
;
149 const char *next_realm
= NULL
;
150 for(r
= realms
; r
; r
= r
->next
){
151 /* it *might* be that you can have more than one empty
152 component in a row, at least that's how I interpret the
153 "," exception in 1510 */
154 if(r
->realm
[0] == '\0'){
155 while(r
->next
&& r
->next
->realm
[0] == '\0')
158 next_realm
= r
->next
->realm
;
160 next_realm
= server_realm
;
161 ret
= make_path(context
, r
, prev_realm
, next_realm
);
167 prev_realm
= r
->realm
;
173 expand_realms(krb5_context context
,
174 struct tr_realm
*realms
, const char *client_realm
)
177 const char *prev_realm
= NULL
;
178 for(r
= realms
; r
; r
= r
->next
){
183 if(prev_realm
== NULL
)
184 prev_realm
= client_realm
;
186 len
= strlen(r
->realm
) + strlen(prev_realm
) + 1;
188 tmp
= realloc(r
->realm
, len
);
191 krb5_set_error_message(context
, ENOMEM
,
192 N_("malloc: out of memory", ""));
196 strlcat(r
->realm
, prev_realm
, len
);
197 }else if(r
->leading_slash
&& !r
->leading_space
&& prev_realm
){
198 /* yet another exception: if you use x500-names, the
199 leading realm doesn't have to be "quoted" with a space */
201 size_t len
= strlen(r
->realm
) + strlen(prev_realm
) + 1;
206 krb5_set_error_message(context
, ENOMEM
,
207 N_("malloc: out of memory", ""));
210 strlcpy(tmp
, prev_realm
, len
);
211 strlcat(tmp
, r
->realm
, len
);
215 prev_realm
= r
->realm
;
220 static struct tr_realm
*
221 make_realm(char *realm
)
226 r
= calloc(1, sizeof(*r
));
232 for(p
= q
= r
->realm
; *p
; p
++){
233 if(p
== r
->realm
&& *p
== ' '){
234 r
->leading_space
= 1;
237 if(q
== r
->realm
&& *p
== '/')
238 r
->leading_slash
= 1;
248 if(p
[0] == '.' && p
[1] == '\0')
256 static struct tr_realm
*
257 append_realm(struct tr_realm
*head
, struct tr_realm
*r
)
265 while(p
->next
) p
= p
->next
;
271 decode_realms(krb5_context context
,
272 const char *tr
, int length
, struct tr_realm
**realms
)
274 struct tr_realm
*r
= NULL
;
278 const char *start
= tr
;
281 for(i
= 0; i
< length
; i
++){
291 tmp
= malloc(tr
+ i
- start
+ 1);
293 krb5_set_error_message(context
, ENOMEM
,
294 N_("malloc: out of memory", ""));
297 memcpy(tmp
, start
, tr
+ i
- start
);
298 tmp
[tr
+ i
- start
] = '\0';
301 free_realms(*realms
);
302 krb5_set_error_message(context
, ENOMEM
,
303 N_("malloc: out of memory", ""));
306 *realms
= append_realm(*realms
, r
);
310 tmp
= malloc(tr
+ i
- start
+ 1);
313 krb5_set_error_message(context
, ENOMEM
,
314 N_("malloc: out of memory", ""));
317 memcpy(tmp
, start
, tr
+ i
- start
);
318 tmp
[tr
+ i
- start
] = '\0';
321 free_realms(*realms
);
322 krb5_set_error_message(context
, ENOMEM
,
323 N_("malloc: out of memory", ""));
326 *realms
= append_realm(*realms
, r
);
332 krb5_error_code KRB5_LIB_FUNCTION
333 krb5_domain_x500_decode(krb5_context context
,
334 krb5_data tr
, char ***realms
, unsigned int *num_realms
,
335 const char *client_realm
, const char *server_realm
)
337 struct tr_realm
*r
= NULL
;
338 struct tr_realm
*p
, **q
;
347 /* split string in components */
348 ret
= decode_realms(context
, tr
.data
, tr
.length
, &r
);
352 /* apply prefix rule */
353 ret
= expand_realms(context
, r
, client_realm
);
357 ret
= make_paths(context
, r
, client_realm
, server_realm
);
361 /* remove empty components and count realms */
365 if(p
->realm
[0] == '\0'){
376 if (*num_realms
< 0 || *num_realms
+ 1 > UINT_MAX
/sizeof(**realms
))
381 R
= malloc((*num_realms
+ 1) * sizeof(*R
));
395 krb5_error_code KRB5_LIB_FUNCTION
396 krb5_domain_x500_encode(char **realms
, unsigned int num_realms
,
402 krb5_data_zero(encoding
);
405 for(i
= 0; i
< num_realms
; i
++){
406 len
+= strlen(realms
[i
]);
407 if(realms
[i
][0] == '/')
410 len
+= num_realms
- 1;
415 for(i
= 0; i
< num_realms
; i
++){
416 if(i
&& i
< num_realms
- 1)
417 strlcat(s
, ",", len
+ 1);
418 if(realms
[i
][0] == '/')
419 strlcat(s
, " ", len
+ 1);
420 strlcat(s
, realms
[i
], len
+ 1);
423 encoding
->length
= strlen(s
);
427 krb5_error_code KRB5_LIB_FUNCTION
428 krb5_check_transited(krb5_context context
,
429 krb5_const_realm client_realm
,
430 krb5_const_realm server_realm
,
432 unsigned int num_realms
,
442 tr_realms
= krb5_config_get_strings(context
, NULL
,
447 for(i
= 0; i
< num_realms
; i
++) {
448 for(p
= tr_realms
; p
&& *p
; p
++) {
449 if(strcmp(*p
, realms
[i
]) == 0)
452 if(p
== NULL
|| *p
== NULL
) {
453 krb5_config_free_strings(tr_realms
);
454 krb5_set_error_message (context
, KRB5KRB_AP_ERR_ILL_CR_TKT
,
455 N_("no transit allowed "
456 "through realm %s", ""),
460 return KRB5KRB_AP_ERR_ILL_CR_TKT
;
463 krb5_config_free_strings(tr_realms
);
467 krb5_error_code KRB5_LIB_FUNCTION
468 krb5_check_transited_realms(krb5_context context
,
469 const char *const *realms
,
470 unsigned int num_realms
,
475 char **bad_realms
= krb5_config_get_strings(context
, NULL
,
477 "transited_realms_reject",
479 if(bad_realms
== NULL
)
482 for(i
= 0; i
< num_realms
; i
++) {
484 for(p
= bad_realms
; *p
; p
++)
485 if(strcmp(*p
, realms
[i
]) == 0) {
486 ret
= KRB5KRB_AP_ERR_ILL_CR_TKT
;
487 krb5_set_error_message (context
, ret
,
488 N_("no transit allowed "
489 "through realm %s", ""),
496 krb5_config_free_strings(bad_realms
);
502 main(int argc
, char **argv
)
508 x
.length
= strlen(x
.data
);
509 if(domain_expand(x
, &r
, &num
, argv
[2], argv
[3]))
511 for(i
= 0; i
< num
; i
++)
512 printf("%s\n", r
[i
]);