2 * Copyright (c) 2006 - 2007 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the Institute nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 #include "krb5_locl.h"
43 struct krb5_plugin *next;
47 enum { DSO, SYMBOL } type;
54 enum krb5_plugin_type type;
62 static HEIMDAL_MUTEX plugin_mutex = HEIMDAL_MUTEX_INITIALIZER;
63 static struct plugin *registered = NULL;
64 static int plugins_needs_scan = 1;
66 static const char *sysplugin_dirs[] = {
67 LIBDIR "/plugin/krb5",
69 "/System/Library/KerberosPlugins/KerberosFrameworkPlugins",
79 _krb5_plugin_get_symbol(struct krb5_plugin *p)
85 _krb5_plugin_get_next(struct krb5_plugin *p)
96 static krb5_error_code
97 loadlib(krb5_context context, char *path)
101 e = calloc(1, sizeof(*e));
103 krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
115 /* ignore error from dlopen, and just keep it as negative cache entry */
116 e->u.dso.dsohandle = dlopen(path, RTLD_LOCAL|RTLD_LAZY);
117 e->u.dso.path = path;
119 e->next = registered;
124 #endif /* HAVE_DLOPEN */
127 * Register a plugin symbol name of specific type.
128 * @param context a Keberos context
129 * @param type type of plugin symbol
130 * @param name name of plugin symbol
131 * @param symbol a pointer to the named symbol
132 * @return In case of error a non zero error com_err error is returned
133 * and the Kerberos error string is set.
135 * @ingroup krb5_support
139 krb5_plugin_register(krb5_context context,
140 enum krb5_plugin_type type,
146 HEIMDAL_MUTEX_lock(&plugin_mutex);
148 /* check for duplicates */
149 for (e = registered; e != NULL; e = e->next) {
150 if (e->type == SYMBOL &&
151 strcmp(e->u.symbol.name, name) == 0 &&
152 e->u.symbol.type == type && e->u.symbol.symbol == symbol) {
153 HEIMDAL_MUTEX_unlock(&plugin_mutex);
158 e = calloc(1, sizeof(*e));
160 HEIMDAL_MUTEX_unlock(&plugin_mutex);
161 krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
165 e->u.symbol.type = type;
166 e->u.symbol.name = strdup(name);
167 if (e->u.symbol.name == NULL) {
168 HEIMDAL_MUTEX_unlock(&plugin_mutex);
170 krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
173 e->u.symbol.symbol = symbol;
175 e->next = registered;
177 HEIMDAL_MUTEX_unlock(&plugin_mutex);
182 static krb5_error_code
183 load_plugins(krb5_context context)
187 char **dirs = NULL, **di;
188 struct dirent *entry;
192 if (!plugins_needs_scan)
194 plugins_needs_scan = 0;
198 dirs = krb5_config_get_strings(context, NULL, "libdefaults",
201 dirs = rk_UNCONST(sysplugin_dirs);
203 for (di = dirs; *di != NULL; di++) {
204 #ifdef KRB5_USE_PATH_TOKENS
208 if (_krb5_expand_path_tokens(context, *di, &dir))
221 while ((entry = readdir(d)) != NULL) {
222 char *n = entry->d_name;
225 if (n[0] == '.' && (n[1] == '\0' || (n[1] == '.' && n[2] == '\0')))
231 { /* support loading bundles on MacOS */
232 size_t len = strlen(n);
233 if (len > 7 && strcmp(&n[len - 7], ".bundle") == 0)
234 ret = asprintf(&path, "%s/%s/Contents/MacOS/%.*s", *di, n, (int)(len - 7), n);
237 if (ret < 0 || path == NULL)
238 ret = asprintf(&path, "%s/%s", *di, n);
240 if (ret < 0 || path == NULL) {
242 krb5_set_error_message(context, ret, "malloc: out of memory");
246 /* check if already tried */
247 for (e = registered; e != NULL; e = e->next)
248 if (e->type == DSO && strcmp(e->u.dso.path, path) == 0)
253 loadlib(context, path); /* store or frees path */
258 if (dirs != rk_UNCONST(sysplugin_dirs))
259 krb5_config_free_strings(dirs);
260 #endif /* HAVE_DLOPEN */
264 static krb5_error_code
265 add_symbol(krb5_context context, struct krb5_plugin **list, void *symbol)
267 struct krb5_plugin *e;
269 e = calloc(1, sizeof(*e));
271 krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
281 _krb5_plugin_find(krb5_context context,
282 enum krb5_plugin_type type,
284 struct krb5_plugin **list)
291 HEIMDAL_MUTEX_lock(&plugin_mutex);
293 load_plugins(context);
295 for (ret = 0, e = registered; e != NULL; e = e->next) {
299 if (e->u.dso.dsohandle == NULL)
301 sym = dlsym(e->u.dso.dsohandle, name);
303 ret = add_symbol(context, list, sym);
307 if (strcmp(e->u.symbol.name, name) == 0 && e->u.symbol.type == type)
308 ret = add_symbol(context, list, e->u.symbol.symbol);
312 _krb5_plugin_free(*list);
317 HEIMDAL_MUTEX_unlock(&plugin_mutex);
322 krb5_set_error_message(context, ENOENT, "Did not find a plugin for %s", name);
330 _krb5_plugin_free(struct krb5_plugin *list)
332 struct krb5_plugin *next;
343 * array = { ptr, ctx }
349 static heim_dict_t modules;
358 plug_dealloc(void *ptr)
360 struct plugin2 *p = ptr;
361 heim_release(p->path);
362 heim_release(p->names);
364 dlclose(p->dsohandle);
369 _krb5_load_plugins(krb5_context context, const char *name, const char **paths)
372 heim_string_t s = heim_string_create(name);
374 struct dirent *entry;
379 HEIMDAL_MUTEX_lock(&plugin_mutex);
381 if (modules == NULL) {
382 modules = heim_dict_create(11);
383 if (modules == NULL) {
384 HEIMDAL_MUTEX_unlock(&plugin_mutex);
389 module = heim_dict_copy_value(modules, s);
390 if (module == NULL) {
391 module = heim_dict_create(11);
392 if (module == NULL) {
393 HEIMDAL_MUTEX_unlock(&plugin_mutex);
397 heim_dict_add_value(modules, s, module);
401 for (di = paths; *di != NULL; di++) {
407 while ((entry = readdir(d)) != NULL) {
408 char *n = entry->d_name;
414 if (n[0] == '.' && (n[1] == '\0' || (n[1] == '.' && n[2] == '\0')))
419 { /* support loading bundles on MacOS */
420 size_t len = strlen(n);
421 if (len > 7 && strcmp(&n[len - 7], ".bundle") == 0)
422 ret = asprintf(&path, "%s/%s/Contents/MacOS/%.*s", *di, n, (int)(len - 7), n);
425 if (ret < 0 || path == NULL)
426 ret = asprintf(&path, "%s/%s", *di, n);
428 if (ret < 0 || path == NULL)
431 spath = heim_string_create(n);
437 /* check if already cached */
438 p = heim_dict_copy_value(module, spath);
440 p = heim_alloc(sizeof(*p), "krb5-plugin", plug_dealloc);
442 p->dsohandle = dlopen(path, RTLD_LOCAL|RTLD_LAZY);
445 p->path = heim_retain(spath);
446 p->names = heim_dict_create(11);
447 heim_dict_add_value(module, spath, p);
456 heim_release(module);
457 HEIMDAL_MUTEX_unlock(&plugin_mutex);
458 #endif /* HAVE_DLOPEN */
462 _krb5_unload_plugins(krb5_context context, const char *name)
464 HEIMDAL_MUTEX_lock(&plugin_mutex);
465 heim_release(modules);
467 HEIMDAL_MUTEX_unlock(&plugin_mutex);
474 struct common_plugin_method {
476 krb5_error_code (*init)(krb5_context, void **);
477 void (*fini)(void *);
488 struct plug *pl = ptr;
490 struct common_plugin_method *cpm = pl->dataptr;
496 krb5_context context;
501 krb5_error_code (*func)(krb5_context, const void *, void *, void *);
507 search_modules(void *ctx, heim_object_t key, heim_object_t value)
509 struct iter_ctx *s = ctx;
510 struct plugin2 *p = value;
511 struct plug *pl = heim_dict_copy_value(p->names, s->n);
512 struct common_plugin_method *cpm;
515 if (p->dsohandle == NULL)
518 pl = heim_alloc(sizeof(*pl), "struct-plug", plug_free);
520 cpm = pl->dataptr = dlsym(p->dsohandle, s->name);
524 ret = cpm->init(s->context, &pl->ctx);
526 cpm = pl->dataptr = NULL;
528 heim_dict_add_value(p->names, s->n, pl);
533 if (cpm && cpm->version >= s->min_version)
534 heim_array_append_value(s->result, pl);
540 eval_results(heim_object_t value, void *ctx)
542 struct plug *pl = value;
543 struct iter_ctx *s = ctx;
545 if (s->ret != KRB5_PLUGIN_NO_HANDLE)
548 s->ret = s->func(s->context, pl->dataptr, pl->ctx, s->userctx);
552 _krb5_plugin_run_f(krb5_context context,
558 krb5_error_code (*func)(krb5_context, const void *, void *, void *))
560 heim_string_t m = heim_string_create(module);
564 HEIMDAL_MUTEX_lock(&plugin_mutex);
566 dict = heim_dict_copy_value(modules, m);
569 HEIMDAL_MUTEX_unlock(&plugin_mutex);
570 return KRB5_PLUGIN_NO_HANDLE;
575 s.n = heim_string_create(name);
576 s.min_version = min_version;
577 s.result = heim_array_create();
581 heim_dict_iterate_f(dict, search_modules, &s);
585 HEIMDAL_MUTEX_unlock(&plugin_mutex);
587 s.ret = KRB5_PLUGIN_NO_HANDLE;
589 heim_array_iterate_f(s.result, eval_results, &s);
591 heim_release(s.result);