1 /*- 2 * Copyright (c) 2002-2003 Networks Associates Technology, Inc. 3 * Copyright (c) 2004-2011 Dag-Erling Smørgrav 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