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 *
openpam_load_module(const char * modulename)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
openpam_release_module(pam_module_t * module)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
openpam_destroy_chain(pam_chain_t * chain)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
openpam_clear_chains(pam_chain_t * policy[])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