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openpam_load.c revision 1.1.1.1 
      1 /*-
      2  * Copyright (c) 2002-2003 Networks Associates Technology, Inc.
      3  * Copyright (c) 2004-2011 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  * Id: openpam_load.c 664 2013-03-17 10:56:15Z des
     36  */
     37 
     38 #ifdef HAVE_CONFIG_H
     39 # include "config.h"
     40 #endif
     41 
     42 #include <dlfcn.h>
     43 #include <stdlib.h>
     44 #include <string.h>
     45 
     46 #include <security/pam_appl.h>
     47 
     48 #include "openpam_impl.h"
     49 
     50 /*
     51  * Locate a matching dynamic or static module.
     52  */
     53 
     54 pam_module_t *
     55 openpam_load_module(const char *modulename)
     56 {
     57 	pam_module_t *module;
     58 
     59 	module = openpam_dynamic(modulename);
     60 	openpam_log(PAM_LOG_DEBUG, "%s dynamic %s",
     61 	    (module == NULL) ? "no" : "using", modulename);
     62 
     63 #ifdef OPENPAM_STATIC_MODULES
     64 	/* look for a static module */
     65 	if (module == NULL && strchr(modulename, '/') == NULL) {
     66 		module = openpam_static(modulename);
     67 		openpam_log(PAM_LOG_DEBUG, "%s static %s",
     68 		    (module == NULL) ? "no" : "using", modulename);
     69 	}
     70 #endif
     71 	if (module == NULL) {
     72 		openpam_log(PAM_LOG_ERROR, "no %s found", modulename);
     73 		return (NULL);
     74 	}
     75 	return (module);
     76 }
     77 
     78 
     79 /*
     80  * Release a module.
     81  * XXX highly thread-unsafe
     82  */
     83 
     84 static void
     85 openpam_release_module(pam_module_t *module)
     86 {
     87 	if (module == NULL)
     88 		return;
     89 	if (module->dlh == NULL)
     90 		/* static module */
     91 		return;
     92 	dlclose(module->dlh);
     93 	openpam_log(PAM_LOG_DEBUG, "releasing %s", module->path);
     94 	FREE(module->path);
     95 	FREE(module);
     96 }
     97 
     98 
     99 /*
    100  * Destroy a chain, freeing all its links and releasing the modules
    101  * they point to.
    102  */
    103 
    104 static void
    105 openpam_destroy_chain(pam_chain_t *chain)
    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