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
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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.
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18 * may be used to endorse or promote products derived from this software
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21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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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_message (context);
84 return KRB5KDC_ERR_POLICY;
87 if(strcmp(p, to) == 0)
89 tmp = calloc(1, sizeof(*tmp));
91 krb5_set_error_message(context, ENOMEM,
92 N_("malloc: out of memory", ""));
97 path->realm = strdup(p);
98 if(path->realm == NULL){
99 r->next = path; /* XXX */
100 krb5_set_error_message(context, ENOMEM,
101 N_("malloc: out of memory", ""));
105 }else if(strncmp(from, to, strlen(to)) == 0){
106 p = from + strlen(from);
108 while(p >= from && *p != '/') p--;
110 r->next = path; /* XXX */
111 return KRB5KDC_ERR_POLICY;
113 if(strncmp(to, from, p - from) == 0)
115 tmp = calloc(1, sizeof(*tmp));
117 krb5_set_error_message(context, ENOMEM,
118 N_("malloc: out of memory", ""));
123 path->realm = malloc(p - from + 1);
124 if(path->realm == NULL){
125 r->next = path; /* XXX */
126 krb5_set_error_message(context, ENOMEM,
127 N_("malloc: out of memory", ""));
130 memcpy(path->realm, from, p - from);
131 path->realm[p - from] = '\0';
135 krb5_clear_error_message (context);
136 return KRB5KDC_ERR_POLICY;
144 make_paths(krb5_context context,
145 struct tr_realm *realms, const char *client_realm,
146 const char *server_realm)
150 const char *prev_realm = client_realm;
151 const char *next_realm = NULL;
152 for(r = realms; r; r = r->next){
153 /* it *might* be that you can have more than one empty
154 component in a row, at least that's how I interpret the
155 "," exception in 1510 */
156 if(r->realm[0] == '\0'){
157 while(r->next && r->next->realm[0] == '\0')
160 next_realm = r->next->realm;
162 next_realm = server_realm;
163 ret = make_path(context, r, prev_realm, next_realm);
169 prev_realm = r->realm;
175 expand_realms(krb5_context context,
176 struct tr_realm *realms, const char *client_realm)
179 const char *prev_realm = NULL;
180 for(r = realms; r; r = r->next){
185 if(prev_realm == NULL)
186 prev_realm = client_realm;
188 len = strlen(r->realm) + strlen(prev_realm) + 1;
190 tmp = realloc(r->realm, len);
193 krb5_set_error_message(context, ENOMEM,
194 N_("malloc: out of memory", ""));
198 strlcat(r->realm, prev_realm, len);
199 }else if(r->leading_slash && !r->leading_space && prev_realm){
200 /* yet another exception: if you use x500-names, the
201 leading realm doesn't have to be "quoted" with a space */
203 size_t len = strlen(r->realm) + strlen(prev_realm) + 1;
208 krb5_set_error_message(context, ENOMEM,
209 N_("malloc: out of memory", ""));
212 strlcpy(tmp, prev_realm, len);
213 strlcat(tmp, r->realm, len);
217 prev_realm = r->realm;
222 static struct tr_realm *
223 make_realm(char *realm)
228 r = calloc(1, sizeof(*r));
234 for(p = q = r->realm; *p; p++){
235 if(p == r->realm && *p == ' '){
236 r->leading_space = 1;
239 if(q == r->realm && *p == '/')
240 r->leading_slash = 1;
250 if(p[0] == '.' && p[1] == '\0')
258 static struct tr_realm*
259 append_realm(struct tr_realm *head, struct tr_realm *r)
267 while(p->next) p = p->next;
273 decode_realms(krb5_context context,
274 const char *tr, int length, struct tr_realm **realms)
276 struct tr_realm *r = NULL;
280 const char *start = tr;
283 for(i = 0; i < length; i++){
293 tmp = malloc(tr + i - start + 1);
295 krb5_set_error_message(context, ENOMEM,
296 N_("malloc: out of memory", ""));
299 memcpy(tmp, start, tr + i - start);
300 tmp[tr + i - start] = '\0';
303 free_realms(*realms);
304 krb5_set_error_message(context, ENOMEM,
305 N_("malloc: out of memory", ""));
308 *realms = append_realm(*realms, r);
312 tmp = malloc(tr + i - start + 1);
315 krb5_set_error_message(context, ENOMEM,
316 N_("malloc: out of memory", ""));
319 memcpy(tmp, start, tr + i - start);
320 tmp[tr + i - start] = '\0';
323 free_realms(*realms);
324 krb5_set_error_message(context, ENOMEM,
325 N_("malloc: out of memory", ""));
328 *realms = append_realm(*realms, r);
334 krb5_error_code KRB5_LIB_FUNCTION
335 krb5_domain_x500_decode(krb5_context context,
336 krb5_data tr, char ***realms, unsigned int *num_realms,
337 const char *client_realm, const char *server_realm)
339 struct tr_realm *r = NULL;
340 struct tr_realm *p, **q;
349 /* split string in components */
350 ret = decode_realms(context, tr.data, tr.length, &r);
354 /* apply prefix rule */
355 ret = expand_realms(context, r, client_realm);
359 ret = make_paths(context, r, client_realm, server_realm);
363 /* remove empty components and count realms */
367 if(p->realm[0] == '\0'){
378 if (*num_realms < 0 || *num_realms + 1 > UINT_MAX/sizeof(**realms))
383 R = malloc((*num_realms + 1) * sizeof(*R));
397 krb5_error_code KRB5_LIB_FUNCTION
398 krb5_domain_x500_encode(char **realms, unsigned int num_realms,
404 krb5_data_zero(encoding);
407 for(i = 0; i < num_realms; i++){
408 len += strlen(realms[i]);
409 if(realms[i][0] == '/')
412 len += num_realms - 1;
417 for(i = 0; i < num_realms; i++){
418 if(i && i < num_realms - 1)
419 strlcat(s, ",", len + 1);
420 if(realms[i][0] == '/')
421 strlcat(s, " ", len + 1);
422 strlcat(s, realms[i], len + 1);
425 encoding->length = strlen(s);
429 krb5_error_code KRB5_LIB_FUNCTION
430 krb5_check_transited(krb5_context context,
431 krb5_const_realm client_realm,
432 krb5_const_realm server_realm,
434 unsigned int num_realms,
444 tr_realms = krb5_config_get_strings(context, NULL,
449 for(i = 0; i < num_realms; i++) {
450 for(p = tr_realms; p && *p; p++) {
451 if(strcmp(*p, realms[i]) == 0)
454 if(p == NULL || *p == NULL) {
455 krb5_config_free_strings(tr_realms);
456 krb5_set_error_message (context, KRB5KRB_AP_ERR_ILL_CR_TKT,
457 N_("no transit allowed "
458 "through realm %s", ""),
462 return KRB5KRB_AP_ERR_ILL_CR_TKT;
465 krb5_config_free_strings(tr_realms);
469 krb5_error_code KRB5_LIB_FUNCTION
470 krb5_check_transited_realms(krb5_context context,
471 const char *const *realms,
472 unsigned int num_realms,
477 char **bad_realms = krb5_config_get_strings(context, NULL,
479 "transited_realms_reject",
481 if(bad_realms == NULL)
484 for(i = 0; i < num_realms; i++) {
486 for(p = bad_realms; *p; p++)
487 if(strcmp(*p, realms[i]) == 0) {
488 ret = KRB5KRB_AP_ERR_ILL_CR_TKT;
489 krb5_set_error_message (context, ret,
490 N_("no transit allowed "
491 "through realm %s", ""),
498 krb5_config_free_strings(bad_realms);
504 main(int argc, char **argv)
510 x.length = strlen(x.data);
511 if(domain_expand(x, &r, &num, argv[2], argv[3]))
513 for(i = 0; i < num; i++)
514 printf("%s\n", r[i]);