Add the file I forgot in #6131.

Sponsored by:	DARPA, NAI Labs


git-svn-id: svn+ssh://svn.openpam.org/svn/openpam/trunk@22 185d5e19-27fe-0310-9dcf-9bff6b9f3609

lib/openpam_load.c

@@ -0,0 +1,128 @@
+/*-
+ * Copyright (c) 2002 Networks Associates Technologies, Inc.
+ * All rights reserved.
+ *
+ * This software was developed for the FreeBSD Project by ThinkSec AS and
+ * NAI Labs, the Security Research Division of Network Associates, Inc.
+ * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
+ * DARPA CHATS research program.
+ *
+ * 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. The name of the author may not be used to endorse or promote
+ *    products derived from this software without specific prior written
+ *    permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
+ *
+ * $Id$
+ */
+
+#include <dlfcn.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <security/pam_appl.h>
+
+#include "openpam_impl.h"
+
+const char *_pam_sm_func_name[PAM_NUM_PRIMITIVES] = {
+	"pam_sm_acct_mgmt",
+	"pam_sm_authenticate",
+	"pam_sm_chauthtok",
+	"pam_sm_close_session",
+	"pam_sm_open_session",
+	"pam_sm_setcred"
+};
+
+int
+openpam_add_module(pam_handle_t *pamh,
+	int chain,
+	int flag,
+	const char *modpath,
+	const char *options /* XXX */ __unused)
+{
+	pam_chain_t *module, *iterator;
+	int i;
+
+	/* fill in configuration data */
+	if ((module = malloc(sizeof(*module))) == NULL) {
+		openpam_log(PAM_LOG_ERROR, "malloc(): %m");
+		return (PAM_BUF_ERR);
+	}
+	if ((module->modpath = strdup(modpath)) == NULL) {
+		openpam_log(PAM_LOG_ERROR, "strdup(): %m");
+		free(module);
+		return (PAM_BUF_ERR);
+	}
+	module->flag = flag;
+	module->next = NULL;
+
+	/* load module and resolve symbols */
+	/*
+	 * Each module is dlopen()'d once for evey time it occurs in
+	 * any chain.  While the linker is smart enough to not load
+	 * the same module more than once, it does waste space in the
+	 * form of linker handles and pam_func structs.
+	 *
+	 * TODO: implement a central module cache and replace the
+	 * array of pam_func structs in struct pam_chain with pointers
+	 * to the appropriate entry in the module cache.
+	 */
+	if ((module->dlh = dlopen(modpath, RTLD_NOW)) == NULL) {
+		openpam_log(PAM_LOG_ERROR, "dlopen(): %s", dlerror());
+		free(module->modpath);
+		free(module);
+		return (PAM_OPEN_ERR);
+	}
+	for (i = 0; i < PAM_NUM_PRIMITIVES; ++i)
+		module->primitive[i] =
+		    dlsym(module->dlh, _pam_sm_func_name[i]);
+
+	if ((iterator = pamh->chains[chain]) != NULL) {
+		while (iterator->next != NULL)
+			iterator = iterator->next;
+		iterator->next = module;
+	} else {
+		pamh->chains[chain] = module;
+	}
+	return (PAM_SUCCESS);
+}
+
+/*
+ * Clear the chains and release the modules
+ */
+
+void
+openpam_clear_chains(pam_handle_t *pamh)
+{
+	pam_chain_t *module;
+	int i;
+
+	for (i = 0; i < PAM_NUM_CHAINS; ++i) {
+		while (pamh->chains[i] != NULL) {
+			module = pamh->chains[i];
+			pamh->chains[i] = module->next;
+			/* XXX free options */
+			dlclose(module->dlh);
+			free(module->modpath);
+			free(module);
+		}
+	}
+}