1/*-
2 * Copyright (c) 2002-2003 Networks Associates Technology, Inc.
3 * Copyright (c) 2004-2007 Dag-Erling Sm��rgrav
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 408 2007-12-21 11:36:24Z des $
36 */
37
38#include <dlfcn.h>
39#include <stdlib.h>
40#include <string.h>
41
42#include <security/pam_appl.h>
43
44#include "openpam_impl.h"
45
46const char *_pam_func_name[PAM_NUM_PRIMITIVES] = {
47 "pam_authenticate",
48 "pam_setcred",
49 "pam_acct_mgmt",
50 "pam_open_session",
51 "pam_close_session",
52 "pam_chauthtok"
53};
54
55const char *_pam_sm_func_name[PAM_NUM_PRIMITIVES] = {
56 "pam_sm_authenticate",
57 "pam_sm_setcred",
58 "pam_sm_acct_mgmt",
59 "pam_sm_open_session",
60 "pam_sm_close_session",
61 "pam_sm_chauthtok"
62};
63
64/*
65 * Locate a matching dynamic or static module.
66 */
67
68pam_module_t *
69openpam_load_module(const char *path)
70{
71 pam_module_t *module;
72
73 module = openpam_dynamic(path);
74 openpam_log(PAM_LOG_DEBUG, "%s dynamic %s",
75 (module == NULL) ? "no" : "using", path);
76
77#ifdef OPENPAM_STATIC_MODULES
78 /* look for a static module */
79 if (module == NULL && strchr(path, '/') == NULL) {
80 module = openpam_static(path);
81 openpam_log(PAM_LOG_DEBUG, "%s static %s",
82 (module == NULL) ? "no" : "using", path);
83 }
84#endif
85 if (module == NULL) {
86 openpam_log(PAM_LOG_ERROR, "no %s found", path);
87 return (NULL);
88 }
89 return (module);
90}
91
92
93/*
94 * Release a module.
95 * XXX highly thread-unsafe
96 */
97
98static void
99openpam_release_module(pam_module_t *module)
100{
101 if (module == NULL)
102 return;
103 if (module->dlh == NULL)
104 /* static module */
105 return;
106 dlclose(module->dlh);
107 openpam_log(PAM_LOG_DEBUG, "releasing %s", module->path);
108 FREE(module->path);
109 FREE(module);
110}
111
112
113/*
114 * Destroy a chain, freeing all its links and releasing the modules
115 * they point to.
116 */
117
118static void
119openpam_destroy_chain(pam_chain_t *chain)
120{
121 if (chain == NULL)
122 return;
123 openpam_destroy_chain(chain->next);
124 chain->next = NULL;
125 while (chain->optc) {
126 --chain->optc;
127 FREE(chain->optv[chain->optc]);
128 }
129 FREE(chain->optv);
130 openpam_release_module(chain->module);
131 chain->module = NULL;
132 FREE(chain);
133}
134
135
136/*
137 * Clear the chains and release the modules
138 */
139
140void
141openpam_clear_chains(pam_chain_t *policy[])
142{
143 int i;
144
145 for (i = 0; i < PAM_NUM_FACILITIES; ++i) {
146 openpam_destroy_chain(policy[i]);
147 policy[i] = NULL;
148 }
149}
150
151/*
152 * NOPARSE
153 */