2 * Copyright (c) 1997 - 2001 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
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34 #include "krb5_locl.h"
36 RCSID("$Id: transited.c,v 1.9 2002/09/09 14:03:03 nectar Exp $");
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));
92 path->realm = strdup(p);
93 if(path->realm == NULL){
94 r->next = path; /* XXX */
95 krb5_set_error_string (context, "malloc: out of memory");
99 }else if(strncmp(from, to, strlen(to)) == 0){
100 p = from + strlen(from);
102 while(p >= from && *p != '/') p--;
104 return KRB5KDC_ERR_POLICY;
105 if(strncmp(to, from, p - from) == 0)
107 tmp = calloc(1, sizeof(*tmp));
110 path->realm = malloc(p - from + 1);
111 if(path->realm == NULL){
112 r->next = path; /* XXX */
113 krb5_set_error_string (context, "malloc: out of memory");
116 memcpy(path->realm, from, p - from);
117 path->realm[p - from] = '\0';
121 krb5_clear_error_string (context);
122 return KRB5KDC_ERR_POLICY;
130 make_paths(krb5_context context,
131 struct tr_realm *realms, const char *client_realm,
132 const char *server_realm)
136 const char *prev_realm = client_realm;
137 const char *next_realm = NULL;
138 for(r = realms; r; r = r->next){
139 /* it *might* be that you can have more than one empty
140 component in a row, at least that's how I interpret the
141 "," exception in 1510 */
142 if(r->realm[0] == '\0'){
143 while(r->next && r->next->realm[0] == '\0')
146 next_realm = r->next->realm;
148 next_realm = server_realm;
149 ret = make_path(context, r, prev_realm, next_realm);
155 prev_realm = r->realm;
161 expand_realms(krb5_context context,
162 struct tr_realm *realms, const char *client_realm)
165 const char *prev_realm = NULL;
166 for(r = realms; r; r = r->next){
169 if(prev_realm == NULL)
170 prev_realm = client_realm;
171 tmp = realloc(r->realm, strlen(r->realm) + strlen(prev_realm) + 1);
174 krb5_set_error_string (context, "malloc: out of memory");
178 strcat(r->realm, prev_realm);
179 }else if(r->leading_slash && !r->leading_space && prev_realm){
180 /* yet another exception: if you use x500-names, the
181 leading realm doesn't have to be "quoted" with a space */
183 tmp = malloc(strlen(r->realm) + strlen(prev_realm) + 1);
186 krb5_set_error_string (context, "malloc: out of memory");
189 strcpy(tmp, prev_realm);
190 strcat(tmp, r->realm);
194 prev_realm = r->realm;
199 static struct tr_realm *
200 make_realm(char *realm)
205 r = calloc(1, sizeof(*r));
211 for(p = q = r->realm; *p; p++){
212 if(p == r->realm && *p == ' '){
213 r->leading_space = 1;
216 if(q == r->realm && *p == '/')
217 r->leading_slash = 1;
227 if(p[0] == '.' && p[1] == '\0')
235 static struct tr_realm*
236 append_realm(struct tr_realm *head, struct tr_realm *r)
244 while(p->next) p = p->next;
250 decode_realms(krb5_context context,
251 const char *tr, int length, struct tr_realm **realms)
253 struct tr_realm *r = NULL;
257 const char *start = tr;
260 for(i = 0; i < length; i++){
270 tmp = malloc(tr + i - start + 1);
271 memcpy(tmp, start, tr + i - start);
272 tmp[tr + i - start] = '\0';
275 free_realms(*realms);
276 krb5_set_error_string (context, "malloc: out of memory");
279 *realms = append_realm(*realms, r);
283 tmp = malloc(tr + i - start + 1);
284 memcpy(tmp, start, tr + i - start);
285 tmp[tr + i - start] = '\0';
288 free_realms(*realms);
289 krb5_set_error_string (context, "malloc: out of memory");
292 *realms = append_realm(*realms, r);
299 krb5_domain_x500_decode(krb5_context context,
300 krb5_data tr, char ***realms, int *num_realms,
301 const char *client_realm, const char *server_realm)
303 struct tr_realm *r = NULL;
304 struct tr_realm *p, **q;
307 /* split string in components */
308 ret = decode_realms(context, tr.data, tr.length, &r);
312 /* apply prefix rule */
313 ret = expand_realms(context, r, client_realm);
317 ret = make_paths(context, r, client_realm, server_realm);
321 /* remove empty components and count realms */
325 if(p->realm[0] == '\0'){
336 if (*num_realms < 0 || *num_realms + 1 > UINT_MAX/sizeof(**realms))
341 R = malloc((*num_realms + 1) * sizeof(*R));
356 krb5_domain_x500_encode(char **realms, int num_realms, krb5_data *encoding)
361 for(i = 0; i < num_realms; i++){
362 len += strlen(realms[i]);
363 if(realms[i][0] == '/')
366 len += num_realms - 1;
369 for(i = 0; i < num_realms; i++){
370 if(i && i < num_realms - 1)
372 if(realms[i][0] == '/')
374 strcat(s, realms[i]);
377 encoding->length = strlen(s);
382 krb5_check_transited_realms(krb5_context context,
383 const char *const *realms,
389 char **bad_realms = krb5_config_get_strings(context, NULL,
391 "transited_realms_reject",
393 if(bad_realms == NULL)
396 for(i = 0; i < num_realms; i++) {
398 for(p = bad_realms; *p; p++)
399 if(strcmp(*p, realms[i]) == 0) {
400 krb5_set_error_string (context, "no transit through realm %s",
402 ret = KRB5KRB_AP_ERR_ILL_CR_TKT;
408 krb5_config_free_strings(bad_realms);
414 main(int argc, char **argv)
420 x.length = strlen(x.data);
421 if(domain_expand(x, &r, &num, argv[2], argv[3]))
423 for(i = 0; i < num; i++)
424 printf("%s\n", r[i]);