1/* $NetBSD: openpam_load.c,v 1.2 2011/12/25 22:27:55 christos Exp $ */ 2 3/*- 4 * Copyright (c) 2002-2003 Networks Associates Technology, Inc. 5 * Copyright (c) 2004-2011 Dag-Erling Smørgrav 6 * All rights reserved. 7 * 8 * This software was developed for the FreeBSD Project by ThinkSec AS and 9 * Network Associates Laboratories, the Security Research Division of 10 * Network Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 11 * ("CBOSS"), as part of the DARPA CHATS research program. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. The name of the author may not be used to endorse or promote 22 * products derived from this software without specific prior written 23 * permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 * Id: openpam_load.c 491 2011-11-12 00:12:32Z des 38 */ 39 40#ifdef HAVE_CONFIG_H 41# include "config.h" 42#endif 43 44#include <dlfcn.h> 45#include <stdlib.h> 46#include <string.h> 47 48#include <security/pam_appl.h> 49 50#include "openpam_impl.h" 51 52/* 53 * Locate a matching dynamic or static module. 54 */ 55 56pam_module_t * 57openpam_load_module(const char *path) 58{ 59 pam_module_t *module; 60 61 module = openpam_dynamic(path); 62 openpam_log(PAM_LOG_DEBUG, "%s dynamic %s", 63 (module == NULL) ? "no" : "using", path); 64 65#ifdef OPENPAM_STATIC_MODULES 66 /* look for a static module */ 67 if (module == NULL && strchr(path, '/') == NULL) { 68 module = openpam_static(path); 69 openpam_log(PAM_LOG_DEBUG, "%s static %s", 70 (module == NULL) ? "no" : "using", path); 71 } 72#endif 73 if (module == NULL) { 74 openpam_log(PAM_LOG_ERROR, "no %s found", path); 75 return (NULL); 76 } 77 return (module); 78} 79 80 81/* 82 * Release a module. 83 * XXX highly thread-unsafe 84 */ 85 86static void 87openpam_release_module(pam_module_t *module) 88{ 89 if (module == NULL) 90 return; 91 if (module->dlh == NULL) 92 /* static module */ 93 return; 94 dlclose(module->dlh); 95 openpam_log(PAM_LOG_DEBUG, "releasing %s", module->path); 96 FREE(module->path); 97 FREE(module); 98} 99 100 101/* 102 * Destroy a chain, freeing all its links and releasing the modules 103 * they point to. 104 */ 105 106static void 107openpam_destroy_chain(pam_chain_t *chain) 108{ 109 if (chain == NULL) 110 return; 111 openpam_destroy_chain(chain->next); 112 chain->next = NULL; 113 while (chain->optc--) 114 FREE(chain->optv[chain->optc]); 115 FREE(chain->optv); 116 openpam_release_module(chain->module); 117 chain->module = NULL; 118 FREE(chain); 119} 120 121 122/* 123 * Clear the chains and release the modules 124 */ 125 126void 127openpam_clear_chains(pam_chain_t *policy[]) 128{ 129 int i; 130 131 for (i = 0; i < PAM_NUM_FACILITIES; ++i) { 132 openpam_destroy_chain(policy[i]); 133 policy[i] = NULL; 134 } 135} 136 137/* 138 * NOPARSE 139 */ 140