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-rw-r--r--crypto/heimdal/lib/krb5/plugin.c264
1 files changed, 264 insertions, 0 deletions
diff --git a/crypto/heimdal/lib/krb5/plugin.c b/crypto/heimdal/lib/krb5/plugin.c
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+++ b/crypto/heimdal/lib/krb5/plugin.c
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+/*
+ * Copyright (c) 2006 - 2007 Kungliga Tekniska Högskolan
+ * (Royal Institute of Technology, Stockholm, Sweden).
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * 3. Neither the name of the Institute nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include "krb5_locl.h"
+RCSID("$Id: plugin.c 22033 2007-11-10 10:39:47Z lha $");
+#ifdef HAVE_DLFCN_H
+#include <dlfcn.h>
+#endif
+#include <dirent.h>
+
+struct krb5_plugin {
+ void *symbol;
+ void *dsohandle;
+ struct krb5_plugin *next;
+};
+
+struct plugin {
+ enum krb5_plugin_type type;
+ void *name;
+ void *symbol;
+ struct plugin *next;
+};
+
+static HEIMDAL_MUTEX plugin_mutex = HEIMDAL_MUTEX_INITIALIZER;
+static struct plugin *registered = NULL;
+
+static const char *plugin_dir = LIBDIR "/plugin/krb5";
+
+/*
+ *
+ */
+
+void *
+_krb5_plugin_get_symbol(struct krb5_plugin *p)
+{
+ return p->symbol;
+}
+
+struct krb5_plugin *
+_krb5_plugin_get_next(struct krb5_plugin *p)
+{
+ return p->next;
+}
+
+/*
+ *
+ */
+
+#ifdef HAVE_DLOPEN
+
+static krb5_error_code
+loadlib(krb5_context context,
+ enum krb5_plugin_type type,
+ const char *name,
+ const char *lib,
+ struct krb5_plugin **e)
+{
+ *e = calloc(1, sizeof(**e));
+ if (*e == NULL) {
+ krb5_set_error_string(context, "out of memory");
+ return ENOMEM;
+ }
+
+#ifndef RTLD_LAZY
+#define RTLD_LAZY 0
+#endif
+
+ (*e)->dsohandle = dlopen(lib, RTLD_LAZY);
+ if ((*e)->dsohandle == NULL) {
+ free(*e);
+ *e = NULL;
+ krb5_set_error_string(context, "Failed to load %s: %s",
+ lib, dlerror());
+ return ENOMEM;
+ }
+
+ /* dlsym doesn't care about the type */
+ (*e)->symbol = dlsym((*e)->dsohandle, name);
+ if ((*e)->symbol == NULL) {
+ dlclose((*e)->dsohandle);
+ free(*e);
+ krb5_clear_error_string(context);
+ return ENOMEM;
+ }
+
+ return 0;
+}
+#endif /* HAVE_DLOPEN */
+
+/**
+ * Register a plugin symbol name of specific type.
+ * @param context a Keberos context
+ * @param type type of plugin symbol
+ * @param name name of plugin symbol
+ * @param symbol a pointer to the named symbol
+ * @return In case of error a non zero error com_err error is returned
+ * and the Kerberos error string is set.
+ *
+ * @ingroup krb5_support
+ */
+
+krb5_error_code
+krb5_plugin_register(krb5_context context,
+ enum krb5_plugin_type type,
+ const char *name,
+ void *symbol)
+{
+ struct plugin *e;
+
+ e = calloc(1, sizeof(*e));
+ if (e == NULL) {
+ krb5_set_error_string(context, "out of memory");
+ return ENOMEM;
+ }
+ e->type = type;
+ e->name = strdup(name);
+ if (e->name == NULL) {
+ free(e);
+ krb5_set_error_string(context, "out of memory");
+ return ENOMEM;
+ }
+ e->symbol = symbol;
+
+ HEIMDAL_MUTEX_lock(&plugin_mutex);
+ e->next = registered;
+ registered = e;
+ HEIMDAL_MUTEX_unlock(&plugin_mutex);
+
+ return 0;
+}
+
+krb5_error_code
+_krb5_plugin_find(krb5_context context,
+ enum krb5_plugin_type type,
+ const char *name,
+ struct krb5_plugin **list)
+{
+ struct krb5_plugin *e;
+ struct plugin *p;
+ krb5_error_code ret;
+ char *sysdirs[2] = { NULL, NULL };
+ char **dirs = NULL, **di;
+ struct dirent *entry;
+ char *path;
+ DIR *d = NULL;
+
+ *list = NULL;
+
+ HEIMDAL_MUTEX_lock(&plugin_mutex);
+
+ for (p = registered; p != NULL; p = p->next) {
+ if (p->type != type || strcmp(p->name, name) != 0)
+ continue;
+
+ e = calloc(1, sizeof(*e));
+ if (e == NULL) {
+ HEIMDAL_MUTEX_unlock(&plugin_mutex);
+ krb5_set_error_string(context, "out of memory");
+ ret = ENOMEM;
+ goto out;
+ }
+ e->symbol = p->symbol;
+ e->dsohandle = NULL;
+ e->next = *list;
+ *list = e;
+ }
+ HEIMDAL_MUTEX_unlock(&plugin_mutex);
+
+#ifdef HAVE_DLOPEN
+
+ dirs = krb5_config_get_strings(context, NULL, "libdefaults",
+ "plugin_dir", NULL);
+ if (dirs == NULL) {
+ sysdirs[0] = rk_UNCONST(plugin_dir);
+ dirs = sysdirs;
+ }
+
+ for (di = dirs; *di != NULL; di++) {
+
+ d = opendir(*di);
+ if (d == NULL)
+ continue;
+
+ while ((entry = readdir(d)) != NULL) {
+ asprintf(&path, "%s/%s", *di, entry->d_name);
+ if (path == NULL) {
+ krb5_set_error_string(context, "out of memory");
+ ret = ENOMEM;
+ goto out;
+ }
+ ret = loadlib(context, type, name, path, &e);
+ free(path);
+ if (ret)
+ continue;
+
+ e->next = *list;
+ *list = e;
+ }
+ closedir(d);
+ }
+ if (dirs != sysdirs)
+ krb5_config_free_strings(dirs);
+#endif /* HAVE_DLOPEN */
+
+ if (*list == NULL) {
+ krb5_set_error_string(context, "Did not find a plugin for %s", name);
+ return ENOENT;
+ }
+
+ return 0;
+
+out:
+ if (dirs && dirs != sysdirs)
+ krb5_config_free_strings(dirs);
+ if (d)
+ closedir(d);
+ _krb5_plugin_free(*list);
+ *list = NULL;
+
+ return ret;
+}
+
+void
+_krb5_plugin_free(struct krb5_plugin *list)
+{
+ struct krb5_plugin *next;
+ while (list) {
+ next = list->next;
+ if (list->dsohandle)
+ dlclose(list->dsohandle);
+ free(list);
+ list = next;
+ }
+}
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