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3 * (Royal Institute of Technology, Stockholm, Sweden).
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34 #include "krb5_locl.h"
36 RCSID("$Id: transited.c 17043 2006-04-10 10:26:35Z lha $");
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 r->next = path; /* XXX */
105 return KRB5KDC_ERR_POLICY;
107 if(strncmp(to, from, p - from) == 0)
109 tmp = calloc(1, sizeof(*tmp));
112 path->realm = malloc(p - from + 1);
113 if(path->realm == NULL){
114 r->next = path; /* XXX */
115 krb5_set_error_string (context, "malloc: out of memory");
118 memcpy(path->realm, from, p - from);
119 path->realm[p - from] = '\0';
123 krb5_clear_error_string (context);
124 return KRB5KDC_ERR_POLICY;
132 make_paths(krb5_context context,
133 struct tr_realm *realms, const char *client_realm,
134 const char *server_realm)
138 const char *prev_realm = client_realm;
139 const char *next_realm = NULL;
140 for(r = realms; r; r = r->next){
141 /* it *might* be that you can have more than one empty
142 component in a row, at least that's how I interpret the
143 "," exception in 1510 */
144 if(r->realm[0] == '\0'){
145 while(r->next && r->next->realm[0] == '\0')
148 next_realm = r->next->realm;
150 next_realm = server_realm;
151 ret = make_path(context, r, prev_realm, next_realm);
157 prev_realm = r->realm;
163 expand_realms(krb5_context context,
164 struct tr_realm *realms, const char *client_realm)
167 const char *prev_realm = NULL;
168 for(r = realms; r; r = r->next){
173 if(prev_realm == NULL)
174 prev_realm = client_realm;
176 len = strlen(r->realm) + strlen(prev_realm) + 1;
178 tmp = realloc(r->realm, len);
181 krb5_set_error_string (context, "malloc: out of memory");
185 strlcat(r->realm, prev_realm, len);
186 }else if(r->leading_slash && !r->leading_space && prev_realm){
187 /* yet another exception: if you use x500-names, the
188 leading realm doesn't have to be "quoted" with a space */
190 size_t len = strlen(r->realm) + strlen(prev_realm) + 1;
195 krb5_set_error_string (context, "malloc: out of memory");
198 strlcpy(tmp, prev_realm, len);
199 strlcat(tmp, r->realm, len);
203 prev_realm = r->realm;
208 static struct tr_realm *
209 make_realm(char *realm)
214 r = calloc(1, sizeof(*r));
220 for(p = q = r->realm; *p; p++){
221 if(p == r->realm && *p == ' '){
222 r->leading_space = 1;
225 if(q == r->realm && *p == '/')
226 r->leading_slash = 1;
236 if(p[0] == '.' && p[1] == '\0')
244 static struct tr_realm*
245 append_realm(struct tr_realm *head, struct tr_realm *r)
253 while(p->next) p = p->next;
259 decode_realms(krb5_context context,
260 const char *tr, int length, struct tr_realm **realms)
262 struct tr_realm *r = NULL;
266 const char *start = tr;
269 for(i = 0; i < length; i++){
279 tmp = malloc(tr + i - start + 1);
280 memcpy(tmp, start, tr + i - start);
281 tmp[tr + i - start] = '\0';
284 free_realms(*realms);
285 krb5_set_error_string (context, "malloc: out of memory");
288 *realms = append_realm(*realms, r);
292 tmp = malloc(tr + i - start + 1);
293 memcpy(tmp, start, tr + i - start);
294 tmp[tr + i - start] = '\0';
297 free_realms(*realms);
298 krb5_set_error_string (context, "malloc: out of memory");
301 *realms = append_realm(*realms, r);
307 krb5_error_code KRB5_LIB_FUNCTION
308 krb5_domain_x500_decode(krb5_context context,
309 krb5_data tr, char ***realms, int *num_realms,
310 const char *client_realm, const char *server_realm)
312 struct tr_realm *r = NULL;
313 struct tr_realm *p, **q;
322 /* split string in components */
323 ret = decode_realms(context, tr.data, tr.length, &r);
327 /* apply prefix rule */
328 ret = expand_realms(context, r, client_realm);
332 ret = make_paths(context, r, client_realm, server_realm);
336 /* remove empty components and count realms */
340 if(p->realm[0] == '\0'){
351 if (*num_realms < 0 || *num_realms + 1 > UINT_MAX/sizeof(**realms))
356 R = malloc((*num_realms + 1) * sizeof(*R));
370 krb5_error_code KRB5_LIB_FUNCTION
371 krb5_domain_x500_encode(char **realms, int num_realms, krb5_data *encoding)
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++){
390 if(i && i < num_realms - 1)
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_error_code KRB5_LIB_FUNCTION
402 krb5_check_transited(krb5_context context,
403 krb5_const_realm client_realm,
404 krb5_const_realm server_realm,
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_string (context, "no transit through realm %s",
432 return KRB5KRB_AP_ERR_ILL_CR_TKT;
435 krb5_config_free_strings(tr_realms);
439 krb5_error_code KRB5_LIB_FUNCTION
440 krb5_check_transited_realms(krb5_context context,
441 const char *const *realms,
447 char **bad_realms = krb5_config_get_strings(context, NULL,
449 "transited_realms_reject",
451 if(bad_realms == NULL)
454 for(i = 0; i < num_realms; i++) {
456 for(p = bad_realms; *p; p++)
457 if(strcmp(*p, realms[i]) == 0) {
458 krb5_set_error_string (context, "no transit through realm %s",
460 ret = KRB5KRB_AP_ERR_ILL_CR_TKT;
466 krb5_config_free_strings(bad_realms);
472 main(int argc, char **argv)
478 x.length = strlen(x.data);
479 if(domain_expand(x, &r, &num, argv[2], argv[3]))
481 for(i = 0; i < num; i++)
482 printf("%s\n", r[i]);