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openpam_load.c revision 1.1.1.5 
      1 /*-
      2  * Copyright (c) 2002-2003 Networks Associates Technology, Inc.
      3  * Copyright (c) 2004-2013 Dag-Erling Smrgrav
      4  * All rights reserved.
      5  *
      6  * This software was developed for the FreeBSD Project by ThinkSec AS and
      7  * Network Associates Laboratories, the Security Research Division of
      8  * Network Associates, Inc.  under DARPA/SPAWAR contract N66001-01-C-8035
      9  * ("CBOSS"), as part of the DARPA CHATS research program.
     10  *
     11  * Redistribution and use in source and binary forms, with or without
     12  * modification, are permitted provided that the following conditions
     13  * are met:
     14  * 1. Redistributions of source code must retain the above copyright
     15  *    notice, this list of conditions and the following disclaimer.
     16  * 2. Redistributions in binary form must reproduce the above copyright
     17  *    notice, this list of conditions and the following disclaimer in the
     18  *    documentation and/or other materials provided with the distribution.
     19  * 3. The name of the author may not be used to endorse or promote
     20  *    products derived from this software without specific prior written
     21  *    permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #ifdef HAVE_CONFIG_H
     37 # include "config.h"
     38 #endif
     39 
     40 #include <dlfcn.h>
     41 #include <stdlib.h>
     42 #include <string.h>
     43 
     44 #include <security/pam_appl.h>
     45 
     46 #include "openpam_impl.h"
     47 
     48 /*
     49  * Locate a matching dynamic or static module.
     50  */
     51 
     52 pam_module_t *
     53 openpam_load_module(const char *modulename)
     54 {
     55 	pam_module_t *module;
     56 
     57 	module = openpam_dynamic(modulename);
     58 	openpam_log(PAM_LOG_DEBUG, "%s dynamic %s",
     59 	    (module == NULL) ? "no" : "using", modulename);
     60 
     61 #ifdef OPENPAM_STATIC_MODULES
     62 	/* look for a static module */
     63 	if (module == NULL && strchr(modulename, '/') == NULL) {
     64 		module = openpam_static(modulename);
     65 		openpam_log(PAM_LOG_DEBUG, "%s static %s",
     66 		    (module == NULL) ? "no" : "using", modulename);
     67 	}
     68 #endif
     69 	if (module == NULL) {
     70 		openpam_log(PAM_LOG_ERROR, "no %s found", modulename);
     71 		return (NULL);
     72 	}
     73 	return (module);
     74 }
     75 
     76 
     77 /*
     78  * Release a module.
     79  * XXX highly thread-unsafe
     80  */
     81 
     82 static void
     83 openpam_release_module(pam_module_t *module)
     84 {
     85 
     86 	if (module == NULL)
     87 		return;
     88 	if (module->dlh == NULL)
     89 		/* static module */
     90 		return;
     91 	dlclose(module->dlh);
     92 	openpam_log(PAM_LOG_DEBUG, "releasing %s", module->path);
     93 	FREE(module->path);
     94 	FREE(module);
     95 }
     96 
     97 
     98 /*
     99  * Destroy a chain, freeing all its links and releasing the modules
    100  * they point to.
    101  */
    102 
    103 static void
    104 openpam_destroy_chain(pam_chain_t *chain)
    105 {
    106 
    107 	if (chain == NULL)
    108 		return;
    109 	openpam_destroy_chain(chain->next);
    110 	chain->next = NULL;
    111 	FREEV(chain->optc, chain->optv);
    112 	openpam_release_module(chain->module);
    113 	chain->module = NULL;
    114 	FREE(chain);
    115 }
    116 
    117 
    118 /*
    119  * Clear the chains and release the modules
    120  */
    121 
    122 void
    123 openpam_clear_chains(pam_chain_t *policy[])
    124 {
    125 	int i;
    126 
    127 	for (i = 0; i < PAM_NUM_FACILITIES; ++i) {
    128 		openpam_destroy_chain(policy[i]);
    129 		policy[i] = NULL;
    130 	}
    131 }
    132 
    133 /*
    134  * NOPARSE
    135  */
    136