2 * Copyright (c) 1997 - 2005 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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34 #include "krb5_locl.h"
36 RCSID("$Id: cache.c,v 1.82 2006/09/12 17:35:33 lha Exp $");
39 * Add a new ccache type with operations `ops', overwriting any
40 * existing one if `override'.
41 * Return an error code or 0.
44 krb5_error_code KRB5_LIB_FUNCTION
45 krb5_cc_register(krb5_context context,
46 const krb5_cc_ops *ops,
47 krb5_boolean override)
51 for(i = 0; i < context->num_cc_ops && context->cc_ops[i].prefix; i++) {
52 if(strcmp(context->cc_ops[i].prefix, ops->prefix) == 0) {
54 krb5_set_error_string(context,
55 "ccache type %s already exists",
57 return KRB5_CC_TYPE_EXISTS;
62 if(i == context->num_cc_ops) {
63 krb5_cc_ops *o = realloc(context->cc_ops,
64 (context->num_cc_ops + 1) *
65 sizeof(*context->cc_ops));
67 krb5_set_error_string(context, "malloc: out of memory");
70 context->num_cc_ops++;
72 memset(context->cc_ops + i, 0,
73 (context->num_cc_ops - i) * sizeof(*context->cc_ops));
75 memcpy(&context->cc_ops[i], ops, sizeof(context->cc_ops[i]));
80 * Allocate the memory for a `id' and the that function table to
81 * `ops'. Returns 0 or and error code.
85 _krb5_cc_allocate(krb5_context context,
86 const krb5_cc_ops *ops,
91 p = malloc (sizeof(*p));
93 krb5_set_error_string(context, "malloc: out of memory");
103 * Allocate memory for a new ccache in `id' with operations `ops'
104 * and name `residual'.
105 * Return 0 or an error code.
108 static krb5_error_code
109 allocate_ccache (krb5_context context,
110 const krb5_cc_ops *ops,
111 const char *residual,
116 ret = _krb5_cc_allocate(context, ops, id);
119 ret = (*id)->ops->resolve(context, id, residual);
126 * Find and allocate a ccache in `id' from the specification in `residual'.
127 * If the ccache name doesn't contain any colon, interpret it as a file name.
128 * Return 0 or an error code.
131 krb5_error_code KRB5_LIB_FUNCTION
132 krb5_cc_resolve(krb5_context context,
138 for(i = 0; i < context->num_cc_ops && context->cc_ops[i].prefix; i++) {
139 size_t prefix_len = strlen(context->cc_ops[i].prefix);
141 if(strncmp(context->cc_ops[i].prefix, name, prefix_len) == 0
142 && name[prefix_len] == ':') {
143 return allocate_ccache (context, &context->cc_ops[i],
144 name + prefix_len + 1,
148 if (strchr (name, ':') == NULL)
149 return allocate_ccache (context, &krb5_fcc_ops, name, id);
151 krb5_set_error_string(context, "unknown ccache type %s", name);
152 return KRB5_CC_UNKNOWN_TYPE;
157 * Generate a new ccache of type `ops' in `id'.
158 * Return 0 or an error code.
161 krb5_error_code KRB5_LIB_FUNCTION
162 krb5_cc_gen_new(krb5_context context,
163 const krb5_cc_ops *ops,
168 ret = _krb5_cc_allocate(context, ops, id);
171 return (*id)->ops->gen_new(context, id);
175 * Generates a new unique ccache of `type` in `id'. If `type' is NULL,
176 * the library chooses the default credential cache type. The supplied
177 * `hint' (that can be NULL) is a string that the credential cache
178 * type can use to base the name of the credential on, this is to make
179 * its easier for the user to differentiate the credentials.
181 * Returns 0 or an error code.
184 krb5_error_code KRB5_LIB_FUNCTION
185 krb5_cc_new_unique(krb5_context context, const char *type,
186 const char *hint, krb5_ccache *id)
188 const krb5_cc_ops *ops;
191 type = KRB5_DEFAULT_CCNAME;
193 ops = krb5_cc_get_prefix_ops(context, type);
195 krb5_set_error_string(context, "Credential cache type %s is unknown",
197 return KRB5_CC_UNKNOWN_TYPE;
200 return krb5_cc_gen_new(context, ops, id);
204 * Return the name of the ccache `id'
207 const char* KRB5_LIB_FUNCTION
208 krb5_cc_get_name(krb5_context context,
211 return id->ops->get_name(context, id);
215 * Return the type of the ccache `id'.
218 const char* KRB5_LIB_FUNCTION
219 krb5_cc_get_type(krb5_context context,
222 return id->ops->prefix;
226 * Return the complete resolvable name the ccache `id' in `str´.
227 * `str` should be freed with free(3).
228 * Returns 0 or an error (and then *str is set to NULL).
231 krb5_error_code KRB5_LIB_FUNCTION
232 krb5_cc_get_full_name(krb5_context context,
236 const char *type, *name;
240 type = krb5_cc_get_type(context, id);
242 krb5_set_error_string(context, "cache have no name of type");
243 return KRB5_CC_UNKNOWN_TYPE;
246 name = krb5_cc_get_name(context, id);
248 krb5_set_error_string(context, "cache of type %s have no name", type);
249 return KRB5_CC_BADNAME;
252 if (asprintf(str, "%s:%s", type, name) == -1) {
253 krb5_set_error_string(context, "malloc - out of memory");
261 * Return krb5_cc_ops of a the ccache `id'.
265 krb5_cc_get_ops(krb5_context context, krb5_ccache id)
271 * Expand variables in `str' into `res'
275 _krb5_expand_default_cc_name(krb5_context context, const char *str, char **res)
277 size_t tlen, len = 0;
278 char *tmp, *tmp2, *append;
282 while (str && *str) {
283 tmp = strstr(str, "%{");
284 if (tmp && tmp != str) {
285 append = malloc((tmp - str) + 1);
287 memcpy(append, str, tmp - str);
288 append[tmp - str] = '\0';
292 tmp2 = strchr(tmp, '}');
296 krb5_set_error_string(context, "variable missing }");
297 return KRB5_CONFIG_BADFORMAT;
299 if (strncasecmp(tmp, "%{uid}", 6) == 0)
300 asprintf(&append, "%u", (unsigned)getuid());
301 else if (strncasecmp(tmp, "%{null}", 7) == 0)
306 krb5_set_error_string(context,
307 "expand default cache unknown "
309 (int)(tmp2 - tmp) - 2, tmp + 2);
310 return KRB5_CONFIG_BADFORMAT;
314 append = strdup(str);
317 if (append == NULL) {
320 krb5_set_error_string(context, "malloc - out of memory");
324 tlen = strlen(append);
325 tmp = realloc(*res, len + tlen + 1);
330 krb5_set_error_string(context, "malloc - out of memory");
334 memcpy(*res + len, append, tlen + 1);
342 * Set the default cc name for `context' to `name'.
345 krb5_error_code KRB5_LIB_FUNCTION
346 krb5_cc_set_default_name(krb5_context context, const char *name)
348 krb5_error_code ret = 0;
352 const char *e = NULL;
355 e = getenv("KRB5CCNAME");
360 e = krb5_config_get_string(context, NULL, "libdefaults",
361 "default_cc_name", NULL);
363 e = KRB5_DEFAULT_CCNAME;
364 ret = _krb5_expand_default_cc_name(context, e, &p);
372 krb5_set_error_string(context, "malloc - out of memory");
376 if (context->default_cc_name)
377 free(context->default_cc_name);
379 context->default_cc_name = p;
385 * Return a pointer to a context static string containing the default
389 const char* KRB5_LIB_FUNCTION
390 krb5_cc_default_name(krb5_context context)
392 if (context->default_cc_name == NULL)
393 krb5_cc_set_default_name(context, NULL);
395 return context->default_cc_name;
399 * Open the default ccache in `id'.
400 * Return 0 or an error code.
403 krb5_error_code KRB5_LIB_FUNCTION
404 krb5_cc_default(krb5_context context,
407 const char *p = krb5_cc_default_name(context);
410 krb5_set_error_string(context, "malloc - out of memory");
413 return krb5_cc_resolve(context, p, id);
417 * Create a new ccache in `id' for `primary_principal'.
418 * Return 0 or an error code.
421 krb5_error_code KRB5_LIB_FUNCTION
422 krb5_cc_initialize(krb5_context context,
424 krb5_principal primary_principal)
426 return (*id->ops->init)(context, id, primary_principal);
431 * Remove the ccache `id'.
432 * Return 0 or an error code.
435 krb5_error_code KRB5_LIB_FUNCTION
436 krb5_cc_destroy(krb5_context context,
441 ret = (*id->ops->destroy)(context, id);
442 krb5_cc_close (context, id);
447 * Stop using the ccache `id' and free the related resources.
448 * Return 0 or an error code.
451 krb5_error_code KRB5_LIB_FUNCTION
452 krb5_cc_close(krb5_context context,
456 ret = (*id->ops->close)(context, id);
462 * Store `creds' in the ccache `id'.
463 * Return 0 or an error code.
466 krb5_error_code KRB5_LIB_FUNCTION
467 krb5_cc_store_cred(krb5_context context,
471 return (*id->ops->store)(context, id, creds);
475 * Retrieve the credential identified by `mcreds' (and `whichfields')
476 * from `id' in `creds'.
477 * Return 0 or an error code.
480 krb5_error_code KRB5_LIB_FUNCTION
481 krb5_cc_retrieve_cred(krb5_context context,
483 krb5_flags whichfields,
484 const krb5_creds *mcreds,
488 krb5_cc_cursor cursor;
490 if (id->ops->retrieve != NULL) {
491 return (*id->ops->retrieve)(context, id, whichfields,
495 krb5_cc_start_seq_get(context, id, &cursor);
496 while((ret = krb5_cc_next_cred(context, id, &cursor, creds)) == 0){
497 if(krb5_compare_creds(context, whichfields, mcreds, creds)){
501 krb5_free_cred_contents (context, creds);
503 krb5_cc_end_seq_get(context, id, &cursor);
508 * Return the principal of `id' in `principal'.
509 * Return 0 or an error code.
512 krb5_error_code KRB5_LIB_FUNCTION
513 krb5_cc_get_principal(krb5_context context,
515 krb5_principal *principal)
517 return (*id->ops->get_princ)(context, id, principal);
521 * Start iterating over `id', `cursor' is initialized to the
523 * Return 0 or an error code.
526 krb5_error_code KRB5_LIB_FUNCTION
527 krb5_cc_start_seq_get (krb5_context context,
528 const krb5_ccache id,
529 krb5_cc_cursor *cursor)
531 return (*id->ops->get_first)(context, id, cursor);
535 * Retrieve the next cred pointed to by (`id', `cursor') in `creds'
536 * and advance `cursor'.
537 * Return 0 or an error code.
540 krb5_error_code KRB5_LIB_FUNCTION
541 krb5_cc_next_cred (krb5_context context,
542 const krb5_ccache id,
543 krb5_cc_cursor *cursor,
546 return (*id->ops->get_next)(context, id, cursor, creds);
549 /* like krb5_cc_next_cred, but allow for selective retrieval */
551 krb5_error_code KRB5_LIB_FUNCTION
552 krb5_cc_next_cred_match(krb5_context context,
553 const krb5_ccache id,
554 krb5_cc_cursor * cursor,
556 krb5_flags whichfields,
557 const krb5_creds * mcreds)
561 ret = krb5_cc_next_cred(context, id, cursor, creds);
564 if (mcreds == NULL || krb5_compare_creds(context, whichfields, mcreds, creds))
566 krb5_free_cred_contents(context, creds);
571 * Destroy the cursor `cursor'.
574 krb5_error_code KRB5_LIB_FUNCTION
575 krb5_cc_end_seq_get (krb5_context context,
576 const krb5_ccache id,
577 krb5_cc_cursor *cursor)
579 return (*id->ops->end_get)(context, id, cursor);
583 * Remove the credential identified by `cred', `which' from `id'.
586 krb5_error_code KRB5_LIB_FUNCTION
587 krb5_cc_remove_cred(krb5_context context,
592 if(id->ops->remove_cred == NULL) {
593 krb5_set_error_string(context,
594 "ccache %s does not support remove_cred",
596 return EACCES; /* XXX */
598 return (*id->ops->remove_cred)(context, id, which, cred);
602 * Set the flags of `id' to `flags'.
605 krb5_error_code KRB5_LIB_FUNCTION
606 krb5_cc_set_flags(krb5_context context,
610 return (*id->ops->set_flags)(context, id, flags);
614 * Copy the contents of `from' to `to'.
617 krb5_error_code KRB5_LIB_FUNCTION
618 krb5_cc_copy_cache_match(krb5_context context,
619 const krb5_ccache from,
621 krb5_flags whichfields,
622 const krb5_creds * mcreds,
623 unsigned int *matched)
626 krb5_cc_cursor cursor;
628 krb5_principal princ;
630 ret = krb5_cc_get_principal(context, from, &princ);
633 ret = krb5_cc_initialize(context, to, princ);
635 krb5_free_principal(context, princ);
638 ret = krb5_cc_start_seq_get(context, from, &cursor);
640 krb5_free_principal(context, princ);
646 krb5_cc_next_cred_match(context, from, &cursor, &cred,
647 whichfields, mcreds) == 0) {
650 ret = krb5_cc_store_cred(context, to, &cred);
651 krb5_free_cred_contents(context, &cred);
653 krb5_cc_end_seq_get(context, from, &cursor);
654 krb5_free_principal(context, princ);
658 krb5_error_code KRB5_LIB_FUNCTION
659 krb5_cc_copy_cache(krb5_context context,
660 const krb5_ccache from,
663 return krb5_cc_copy_cache_match(context, from, to, 0, NULL, NULL);
667 * Return the version of `id'.
670 krb5_error_code KRB5_LIB_FUNCTION
671 krb5_cc_get_version(krb5_context context,
672 const krb5_ccache id)
674 if(id->ops->get_version)
675 return (*id->ops->get_version)(context, id);
681 * Clear `mcreds' so it can be used with krb5_cc_retrieve_cred
684 void KRB5_LIB_FUNCTION
685 krb5_cc_clear_mcred(krb5_creds *mcred)
687 memset(mcred, 0, sizeof(*mcred));
691 * Get the cc ops that is registered in `context' to handle the
692 * `prefix'. `prefix' can be a complete credential cache name or a
693 * prefix, the function will only use part up to the first colon (:)
694 * if there is one. Returns NULL if ops not found.
698 krb5_cc_get_prefix_ops(krb5_context context, const char *prefix)
703 if (prefix[0] == '/')
704 return &krb5_fcc_ops;
708 krb5_set_error_string(context, "malloc - out of memory");
715 for(i = 0; i < context->num_cc_ops && context->cc_ops[i].prefix; i++) {
716 if(strcmp(context->cc_ops[i].prefix, p) == 0) {
718 return &context->cc_ops[i];
725 struct krb5_cc_cache_cursor_data {
726 const krb5_cc_ops *ops;
727 krb5_cc_cursor cursor;
731 * Start iterating over all caches of `type'. If `type' is NULL, the
732 * default type is * used. `cursor' is initialized to the beginning.
733 * Return 0 or an error code.
736 krb5_error_code KRB5_LIB_FUNCTION
737 krb5_cc_cache_get_first (krb5_context context,
739 krb5_cc_cache_cursor *cursor)
741 const krb5_cc_ops *ops;
745 type = krb5_cc_default_name(context);
747 ops = krb5_cc_get_prefix_ops(context, type);
749 krb5_set_error_string(context, "Unknown type \"%s\" when iterating "
750 "trying to iterate the credential caches", type);
751 return KRB5_CC_UNKNOWN_TYPE;
754 if (ops->get_cache_first == NULL) {
755 krb5_set_error_string(context, "Credential cache type %s doesn't support "
756 "iterations over caches", ops->prefix);
757 return KRB5_CC_NOSUPP;
760 *cursor = calloc(1, sizeof(**cursor));
761 if (*cursor == NULL) {
762 krb5_set_error_string(context, "malloc - out of memory");
766 (*cursor)->ops = ops;
768 ret = ops->get_cache_first(context, &(*cursor)->cursor);
777 * Retrieve the next cache pointed to by (`cursor') in `id'
778 * and advance `cursor'.
779 * Return 0 or an error code.
782 krb5_error_code KRB5_LIB_FUNCTION
783 krb5_cc_cache_next (krb5_context context,
784 krb5_cc_cache_cursor cursor,
787 return cursor->ops->get_cache_next(context, cursor->cursor, id);
791 * Destroy the cursor `cursor'.
794 krb5_error_code KRB5_LIB_FUNCTION
795 krb5_cc_cache_end_seq_get (krb5_context context,
796 krb5_cc_cache_cursor cursor)
799 ret = cursor->ops->end_cache_get(context, cursor->cursor);
806 * Search for a matching credential cache of type `type' that have the
807 * `principal' as the default principal. If NULL is used for `type',
808 * the default type is used. On success, `id' needs to be freed with
809 * krb5_cc_close or krb5_cc_destroy. On failure, error code is
810 * returned and `id' is set to NULL.
813 krb5_error_code KRB5_LIB_FUNCTION
814 krb5_cc_cache_match (krb5_context context,
815 krb5_principal client,
819 krb5_cc_cache_cursor cursor;
821 krb5_ccache cache = NULL;
825 ret = krb5_cc_cache_get_first (context, type, &cursor);
829 while ((ret = krb5_cc_cache_next (context, cursor, &cache)) == 0) {
830 krb5_principal principal;
832 ret = krb5_cc_get_principal(context, cache, &principal);
836 match = krb5_principal_compare(context, principal, client);
837 krb5_free_principal(context, principal);
842 krb5_cc_close(context, cache);
846 krb5_cc_cache_end_seq_get(context, cursor);
851 krb5_unparse_name(context, client, &str);
853 krb5_set_error_string(context, "Principal %s not found in a "
854 "credential cache", str ? str : "<out of memory>");
857 return KRB5_CC_NOTFOUND;