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"
38 /* this is an attempt at one of the most horrible `compression'
39 schemes that has ever been invented; it's so amazingly brain-dead
40 that words can not describe it, and all this just to save a few
45 unsigned leading_space
:1;
46 unsigned leading_slash
:1;
47 unsigned trailing_dot
:1;
48 struct tr_realm
*next
;
52 free_realms(struct tr_realm
*r
)
64 make_path(krb5_context context
, struct tr_realm
*r
,
65 const char *from
, const char *to
)
68 struct tr_realm
*path
= r
->next
;
71 if(strlen(from
) < strlen(to
)){
78 if(strcmp(from
+ strlen(from
) - strlen(to
), to
) == 0){
83 krb5_clear_error_string (context
);
84 return KRB5KDC_ERR_POLICY
;
87 if(strcmp(p
, to
) == 0)
89 tmp
= calloc(1, sizeof(*tmp
));
91 krb5_set_error_string (context
, "malloc: out of memory");
96 path
->realm
= strdup(p
);
97 if(path
->realm
== NULL
){
98 r
->next
= path
; /* XXX */
99 krb5_set_error_string (context
, "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_string (context
, "malloc: out of memory");
120 path
->realm
= malloc(p
- from
+ 1);
121 if(path
->realm
== NULL
){
122 r
->next
= path
; /* XXX */
123 krb5_set_error_string (context
, "malloc: out of memory");
126 memcpy(path
->realm
, from
, p
- from
);
127 path
->realm
[p
- from
] = '\0';
131 krb5_clear_error_string (context
);
132 return KRB5KDC_ERR_POLICY
;
140 make_paths(krb5_context context
,
141 struct tr_realm
*realms
, const char *client_realm
,
142 const char *server_realm
)
146 const char *prev_realm
= client_realm
;
147 const char *next_realm
= NULL
;
148 for(r
= realms
; r
; r
= r
->next
){
149 /* it *might* be that you can have more than one empty
150 component in a row, at least that's how I interpret the
151 "," exception in 1510 */
152 if(r
->realm
[0] == '\0'){
153 while(r
->next
&& r
->next
->realm
[0] == '\0')
156 next_realm
= r
->next
->realm
;
158 next_realm
= server_realm
;
159 ret
= make_path(context
, r
, prev_realm
, next_realm
);
165 prev_realm
= r
->realm
;
171 expand_realms(krb5_context context
,
172 struct tr_realm
*realms
, const char *client_realm
)
175 const char *prev_realm
= NULL
;
176 for(r
= realms
; r
; r
= r
->next
){
181 if(prev_realm
== NULL
)
182 prev_realm
= client_realm
;
184 len
= strlen(r
->realm
) + strlen(prev_realm
) + 1;
186 tmp
= realloc(r
->realm
, len
);
189 krb5_set_error_string (context
, "malloc: out of memory");
193 strlcat(r
->realm
, prev_realm
, len
);
194 }else if(r
->leading_slash
&& !r
->leading_space
&& prev_realm
){
195 /* yet another exception: if you use x500-names, the
196 leading realm doesn't have to be "quoted" with a space */
198 size_t len
= strlen(r
->realm
) + strlen(prev_realm
) + 1;
203 krb5_set_error_string (context
, "malloc: out of memory");
206 strlcpy(tmp
, prev_realm
, len
);
207 strlcat(tmp
, r
->realm
, len
);
211 prev_realm
= r
->realm
;
216 static struct tr_realm
*
217 make_realm(char *realm
)
222 r
= calloc(1, sizeof(*r
));
228 for(p
= q
= r
->realm
; *p
; p
++){
229 if(p
== r
->realm
&& *p
== ' '){
230 r
->leading_space
= 1;
233 if(q
== r
->realm
&& *p
== '/')
234 r
->leading_slash
= 1;
244 if(p
[0] == '.' && p
[1] == '\0')
252 static struct tr_realm
*
253 append_realm(struct tr_realm
*head
, struct tr_realm
*r
)
261 while(p
->next
) p
= p
->next
;
267 decode_realms(krb5_context context
,
268 const char *tr
, int length
, struct tr_realm
**realms
)
270 struct tr_realm
*r
= NULL
;
274 const char *start
= tr
;
277 for(i
= 0; i
< length
; i
++){
287 tmp
= malloc(tr
+ i
- start
+ 1);
289 krb5_set_error_string (context
, "malloc: out of memory");
292 memcpy(tmp
, start
, tr
+ i
- start
);
293 tmp
[tr
+ i
- start
] = '\0';
296 free_realms(*realms
);
297 krb5_set_error_string (context
, "malloc: out of memory");
300 *realms
= append_realm(*realms
, r
);
304 tmp
= malloc(tr
+ i
- start
+ 1);
307 krb5_set_error_string (context
, "malloc: out of memory");
310 memcpy(tmp
, start
, tr
+ i
- start
);
311 tmp
[tr
+ i
- start
] = '\0';
314 free_realms(*realms
);
315 krb5_set_error_string (context
, "malloc: out of memory");
318 *realms
= append_realm(*realms
, r
);
324 krb5_error_code KRB5_LIB_FUNCTION
325 krb5_domain_x500_decode(krb5_context context
,
326 krb5_data tr
, char ***realms
, unsigned int *num_realms
,
327 const char *client_realm
, const char *server_realm
)
329 struct tr_realm
*r
= NULL
;
330 struct tr_realm
*p
, **q
;
339 /* split string in components */
340 ret
= decode_realms(context
, tr
.data
, tr
.length
, &r
);
344 /* apply prefix rule */
345 ret
= expand_realms(context
, r
, client_realm
);
349 ret
= make_paths(context
, r
, client_realm
, server_realm
);
353 /* remove empty components and count realms */
357 if(p
->realm
[0] == '\0'){
368 if (*num_realms
< 0 || *num_realms
+ 1 > UINT_MAX
/sizeof(**realms
))
373 R
= malloc((*num_realms
+ 1) * sizeof(*R
));
387 krb5_error_code KRB5_LIB_FUNCTION
388 krb5_domain_x500_encode(char **realms
, unsigned int num_realms
,
394 krb5_data_zero(encoding
);
397 for(i
= 0; i
< num_realms
; i
++){
398 len
+= strlen(realms
[i
]);
399 if(realms
[i
][0] == '/')
402 len
+= num_realms
- 1;
407 for(i
= 0; i
< num_realms
; i
++){
408 if(i
&& i
< num_realms
- 1)
409 strlcat(s
, ",", len
+ 1);
410 if(realms
[i
][0] == '/')
411 strlcat(s
, " ", len
+ 1);
412 strlcat(s
, realms
[i
], len
+ 1);
415 encoding
->length
= strlen(s
);
419 krb5_error_code KRB5_LIB_FUNCTION
420 krb5_check_transited(krb5_context context
,
421 krb5_const_realm client_realm
,
422 krb5_const_realm server_realm
,
424 unsigned int num_realms
,
434 tr_realms
= krb5_config_get_strings(context
, NULL
,
439 for(i
= 0; i
< num_realms
; i
++) {
440 for(p
= tr_realms
; p
&& *p
; p
++) {
441 if(strcmp(*p
, realms
[i
]) == 0)
444 if(p
== NULL
|| *p
== NULL
) {
445 krb5_config_free_strings(tr_realms
);
446 krb5_set_error_string (context
, "no transit through realm %s",
450 return KRB5KRB_AP_ERR_ILL_CR_TKT
;
453 krb5_config_free_strings(tr_realms
);
457 krb5_error_code KRB5_LIB_FUNCTION
458 krb5_check_transited_realms(krb5_context context
,
459 const char *const *realms
,
460 unsigned int num_realms
,
465 char **bad_realms
= krb5_config_get_strings(context
, NULL
,
467 "transited_realms_reject",
469 if(bad_realms
== NULL
)
472 for(i
= 0; i
< num_realms
; i
++) {
474 for(p
= bad_realms
; *p
; p
++)
475 if(strcmp(*p
, realms
[i
]) == 0) {
476 krb5_set_error_string (context
, "no transit through realm %s",
478 ret
= KRB5KRB_AP_ERR_ILL_CR_TKT
;
484 krb5_config_free_strings(bad_realms
);
490 main(int argc
, char **argv
)
496 x
.length
= strlen(x
.data
);
497 if(domain_expand(x
, &r
, &num
, argv
[2], argv
[3]))
499 for(i
= 0; i
< num
; i
++)
500 printf("%s\n", r
[i
]);