1 /*-
2 * Copyright (c) 2002-2003 Networks Associates Technology, Inc.
3 * Copyright (c) 2004-2013 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 * $OpenPAM: openpam_load.c 938 2017-04-30 21:34:42Z 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 *
openpam_load_module(const char * modulename)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
openpam_release_module(pam_module_t * module)85 openpam_release_module(pam_module_t *module)
86 {
87
88 if (module == NULL)
89 return;
90 if (module->dlh == NULL)
91 /* static module */
92 return;
93 dlclose(module->dlh);
94 openpam_log(PAM_LOG_DEBUG, "releasing %s", module->path);
95 FREE(module->path);
96 FREE(module);
97 }
98
99
100 /*
101 * Destroy a chain, freeing all its links and releasing the modules
102 * they point to.
103 */
104
105 static void
openpam_destroy_chain(pam_chain_t * chain)106 openpam_destroy_chain(pam_chain_t *chain)
107 {
108
109 if (chain == NULL)
110 return;
111 openpam_destroy_chain(chain->next);
112 chain->next = NULL;
113 FREEV(chain->optc, chain->optv);
114 openpam_release_module(chain->module);
115 chain->module = NULL;
116 FREE(chain);
117 }
118
119
120 /*
121 * Clear the chains and release the modules
122 */
123
124 void
openpam_clear_chains(pam_chain_t * policy[])125 openpam_clear_chains(pam_chain_t *policy[])
126 {
127 int i;
128
129 for (i = 0; i < PAM_NUM_FACILITIES; ++i) {
130 openpam_destroy_chain(policy[i]);
131 policy[i] = NULL;
132 }
133 }
134
135 /*
136 * NOPARSE
137 */
138