2 * Copyright (c) 1997 - 2001, 2003 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
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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);
284 return krb5_enomem(context);
286 *realms = append_realm(*realms, r);
290 tmp = malloc(tr + i - start + 1);
293 return krb5_enomem(context);
295 memcpy(tmp, start, tr + i - start);
296 tmp[tr + i - start] = '\0';
299 free_realms(*realms);
300 return krb5_enomem(context);
302 *realms = append_realm(*realms, r);
308 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
309 krb5_domain_x500_decode(krb5_context context,
310 krb5_data tr, char ***realms, unsigned int *num_realms,
311 const char *client_realm, const char *server_realm)
313 struct tr_realm *r = NULL;
314 struct tr_realm *p, **q;
323 /* split string in components */
324 ret = decode_realms(context, tr.data, tr.length, &r);
328 /* apply prefix rule */
329 ret = expand_realms(context, r, client_realm);
333 ret = make_paths(context, r, client_realm, server_realm);
337 /* remove empty components and count realms */
340 if((*q)->realm[0] == '\0'){
350 if (*num_realms + 1 > UINT_MAX/sizeof(**realms))
355 R = malloc((*num_realms + 1) * sizeof(*R));
357 return krb5_enomem(context);
369 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
370 krb5_domain_x500_encode(char **realms, unsigned int num_realms,
376 krb5_data_zero(encoding);
379 for(i = 0; i < num_realms; i++){
380 len += strlen(realms[i]);
381 if(realms[i][0] == '/')
384 len += num_realms - 1;
389 for(i = 0; i < num_realms; i++){
391 strlcat(s, ",", len + 1);
392 if(realms[i][0] == '/')
393 strlcat(s, " ", len + 1);
394 strlcat(s, realms[i], len + 1);
397 encoding->length = strlen(s);
401 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
402 krb5_check_transited(krb5_context context,
403 krb5_const_realm client_realm,
404 krb5_const_realm server_realm,
406 unsigned int num_realms,
416 tr_realms = krb5_config_get_strings(context, NULL,
421 for(i = 0; i < num_realms; i++) {
422 for(p = tr_realms; p && *p; p++) {
423 if(strcmp(*p, realms[i]) == 0)
426 if(p == NULL || *p == NULL) {
427 krb5_config_free_strings(tr_realms);
428 krb5_set_error_message (context, KRB5KRB_AP_ERR_ILL_CR_TKT,
429 N_("no transit allowed "
430 "through realm %s", ""),
434 return KRB5KRB_AP_ERR_ILL_CR_TKT;
437 krb5_config_free_strings(tr_realms);
441 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
442 krb5_check_transited_realms(krb5_context context,
443 const char *const *realms,
444 unsigned int num_realms,
449 char **bad_realms = krb5_config_get_strings(context, NULL,
451 "transited_realms_reject",
453 if(bad_realms == NULL)
456 for(i = 0; i < num_realms; i++) {
458 for(p = bad_realms; *p; p++)
459 if(strcmp(*p, realms[i]) == 0) {
460 ret = KRB5KRB_AP_ERR_ILL_CR_TKT;
461 krb5_set_error_message (context, ret,
462 N_("no transit allowed "
463 "through realm %s", ""),
470 krb5_config_free_strings(bad_realms);
476 main(int argc, char **argv)
482 x.length = strlen(x.data);
483 if(domain_expand(x, &r, &num, argv[2], argv[3]))
485 for(i = 0; i < num; i++)
486 printf("%s\n", r[i]);