2 * Copyright (c) 1997 - 2001, 2003 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
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7 * modification, are permitted provided that the following conditions
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18 * may be used to endorse or promote products derived from this software
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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)
68 if(strlen(from) < strlen(to)){
75 if(strcmp(from + strlen(from) - strlen(to), to) == 0){
80 krb5_clear_error_message (context);
81 return KRB5KDC_ERR_POLICY;
84 if(strcmp(p, to) == 0)
86 tmp = calloc(1, sizeof(*tmp));
88 return krb5_enomem(context);
91 tmp->realm = strdup(p);
92 if(tmp->realm == NULL){
95 return krb5_enomem(context);
98 }else if(strncmp(from, to, strlen(to)) == 0){
99 p = from + strlen(from);
101 while(p >= from && *p != '/') p--;
103 return KRB5KDC_ERR_POLICY;
105 if(strncmp(to, from, p - from) == 0)
107 tmp = calloc(1, sizeof(*tmp));
109 return krb5_enomem(context);
112 tmp->realm = malloc(p - from + 1);
113 if(tmp->realm == NULL){
116 return krb5_enomem(context);
118 memcpy(tmp->realm, from, p - from);
119 tmp->realm[p - from] = '\0';
123 krb5_clear_error_message (context);
124 return KRB5KDC_ERR_POLICY;
131 make_paths(krb5_context context,
132 struct tr_realm *realms, const char *client_realm,
133 const char *server_realm)
137 const char *prev_realm = client_realm;
138 const char *next_realm = NULL;
139 for(r = realms; r; r = r->next){
140 /* it *might* be that you can have more than one empty
141 component in a row, at least that's how I interpret the
142 "," exception in 1510 */
143 if(r->realm[0] == '\0'){
144 while(r->next && r->next->realm[0] == '\0')
147 next_realm = r->next->realm;
149 next_realm = server_realm;
150 ret = make_path(context, r, prev_realm, next_realm);
156 prev_realm = r->realm;
162 expand_realms(krb5_context context,
163 struct tr_realm *realms, const char *client_realm)
166 const char *prev_realm = NULL;
167 for(r = realms; r; r = r->next){
172 if(prev_realm == NULL)
173 prev_realm = client_realm;
175 len = strlen(r->realm) + strlen(prev_realm) + 1;
177 tmp = realloc(r->realm, len);
180 return krb5_enomem(context);
183 strlcat(r->realm, prev_realm, len);
184 }else if(r->leading_slash && !r->leading_space && prev_realm){
185 /* yet another exception: if you use x500-names, the
186 leading realm doesn't have to be "quoted" with a space */
188 size_t len = strlen(r->realm) + strlen(prev_realm) + 1;
193 return krb5_enomem(context);
195 strlcpy(tmp, prev_realm, len);
196 strlcat(tmp, r->realm, len);
200 prev_realm = r->realm;
205 static struct tr_realm *
206 make_realm(char *realm)
211 r = calloc(1, sizeof(*r));
217 for(p = q = r->realm; *p; p++){
218 if(p == r->realm && *p == ' '){
219 r->leading_space = 1;
222 if(q == r->realm && *p == '/')
223 r->leading_slash = 1;
233 if(p[0] == '.' && p[1] == '\0')
241 static struct tr_realm*
242 append_realm(struct tr_realm *head, struct tr_realm *r)
250 while(p->next) p = p->next;
256 decode_realms(krb5_context context,
257 const char *tr, int length, struct tr_realm **realms)
259 struct tr_realm *r = NULL;
263 const char *start = tr;
266 for(i = 0; i < length; i++){
276 tmp = malloc(tr + i - start + 1);
278 return krb5_enomem(context);
279 memcpy(tmp, start, tr + i - start);
280 tmp[tr + i - start] = '\0';
283 free_realms(*realms);
285 return krb5_enomem(context);
287 *realms = append_realm(*realms, r);
291 tmp = malloc(tr + i - start + 1);
293 free_realms(*realms);
295 return krb5_enomem(context);
297 memcpy(tmp, start, tr + i - start);
298 tmp[tr + i - start] = '\0';
301 free_realms(*realms);
303 return krb5_enomem(context);
305 *realms = append_realm(*realms, r);
311 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
312 krb5_domain_x500_decode(krb5_context context,
313 krb5_data tr, char ***realms, unsigned int *num_realms,
314 const char *client_realm, const char *server_realm)
316 struct tr_realm *r = NULL;
317 struct tr_realm *p, **q;
326 /* split string in components */
327 ret = decode_realms(context, tr.data, tr.length, &r);
331 /* apply prefix rule */
332 ret = expand_realms(context, r, client_realm);
336 ret = make_paths(context, r, client_realm, server_realm);
340 /* remove empty components and count realms */
343 if((*q)->realm[0] == '\0'){
353 if (*num_realms + 1 > UINT_MAX/sizeof(**realms))
358 R = malloc((*num_realms + 1) * sizeof(*R));
360 return krb5_enomem(context);
372 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
373 krb5_domain_x500_encode(char **realms, unsigned int num_realms,
379 krb5_data_zero(encoding);
382 for(i = 0; i < num_realms; i++){
383 len += strlen(realms[i]);
384 if(realms[i][0] == '/')
387 len += num_realms - 1;
392 for(i = 0; i < num_realms; i++){
394 strlcat(s, ",", len + 1);
395 if(realms[i][0] == '/')
396 strlcat(s, " ", len + 1);
397 strlcat(s, realms[i], len + 1);
400 encoding->length = strlen(s);
404 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
405 krb5_check_transited(krb5_context context,
406 krb5_const_realm client_realm,
407 krb5_const_realm server_realm,
409 unsigned int num_realms,
419 tr_realms = krb5_config_get_strings(context, NULL,
424 for(i = 0; i < num_realms; i++) {
425 for(p = tr_realms; p && *p; p++) {
426 if(strcmp(*p, realms[i]) == 0)
429 if(p == NULL || *p == NULL) {
430 krb5_config_free_strings(tr_realms);
431 krb5_set_error_message (context, KRB5KRB_AP_ERR_ILL_CR_TKT,
432 N_("no transit allowed "
433 "through realm %s", ""),
437 return KRB5KRB_AP_ERR_ILL_CR_TKT;
440 krb5_config_free_strings(tr_realms);
444 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
445 krb5_check_transited_realms(krb5_context context,
446 const char *const *realms,
447 unsigned int num_realms,
452 char **bad_realms = krb5_config_get_strings(context, NULL,
454 "transited_realms_reject",
456 if(bad_realms == NULL)
459 for(i = 0; i < num_realms; i++) {
461 for(p = bad_realms; *p; p++)
462 if(strcmp(*p, realms[i]) == 0) {
463 ret = KRB5KRB_AP_ERR_ILL_CR_TKT;
464 krb5_set_error_message (context, ret,
465 N_("no transit allowed "
466 "through realm %s", ""),
473 krb5_config_free_strings(bad_realms);
479 main(int argc, char **argv)
485 x.length = strlen(x.data);
486 if(domain_expand(x, &r, &num, argv[2], argv[3]))
488 for(i = 0; i < num; i++)
489 printf("%s\n", r[i]);