1 /* $NetBSD: openpam_load.c,v 1.4 2023/06/30 21:46:20 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 2002-2003 Networks Associates Technology, Inc. 5 * Copyright (c) 2004-2013 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 38 #ifdef HAVE_CONFIG_H 39 # include "config.h" 40 #endif 41 42 #include <sys/cdefs.h> 43 __RCSID("$NetBSD: openpam_load.c,v 1.4 2023/06/30 21:46:20 christos Exp $"); 44 45 #include <dlfcn.h> 46 #include <stdlib.h> 47 #include <string.h> 48 49 #include <security/pam_appl.h> 50 51 #include "openpam_impl.h" 52 53 /* 54 * Locate a matching dynamic or static module. 55 */ 56 57 pam_module_t * 58 openpam_load_module(const char *modulename) 59 { 60 pam_module_t *module; 61 62 module = openpam_dynamic(modulename); 63 openpam_log(PAM_LOG_DEBUG, "%s dynamic %s", 64 (module == NULL) ? "no" : "using", modulename); 65 66 #ifdef OPENPAM_STATIC_MODULES 67 /* look for a static module */ 68 if (module == NULL && strchr(modulename, '/') == NULL) { 69 module = openpam_static(modulename); 70 openpam_log(PAM_LOG_DEBUG, "%s static %s", 71 (module == NULL) ? "no" : "using", modulename); 72 } 73 #endif 74 if (module == NULL) { 75 openpam_log(PAM_LOG_ERROR, "no %s found", modulename); 76 return (NULL); 77 } 78 return (module); 79 } 80 81 82 /* 83 * Release a module. 84 * XXX highly thread-unsafe 85 */ 86 87 static void 88 openpam_release_module(pam_module_t *module) 89 { 90 91 if (module == NULL) 92 return; 93 if (module->dlh == NULL) 94 /* static module */ 95 return; 96 dlclose(module->dlh); 97 openpam_log(PAM_LOG_DEBUG, "releasing %s", module->path); 98 FREE(module->path); 99 FREE(module); 100 } 101 102 103 /* 104 * Destroy a chain, freeing all its links and releasing the modules 105 * they point to. 106 */ 107 108 static void 109 openpam_destroy_chain(pam_chain_t *chain) 110 { 111 112 if (chain == NULL) 113 return; 114 openpam_destroy_chain(chain->next); 115 chain->next = NULL; 116 FREEV(chain->optc, chain->optv); 117 openpam_release_module(chain->module); 118 chain->module = NULL; 119 FREE(chain); 120 } 121 122 123 /* 124 * Clear the chains and release the modules 125 */ 126 127 void 128 openpam_clear_chains(pam_chain_t *policy[]) 129 { 130 int i; 131 132 for (i = 0; i < PAM_NUM_FACILITIES; ++i) { 133 openpam_destroy_chain(policy[i]); 134 policy[i] = NULL; 135 } 136 } 137 138 /* 139 * NOPARSE 140 */ 141