1/*-
2 * Copyright (c) 2002-2003 Networks Associates Technology, Inc.
3 * Copyright (c) 2004-2007 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 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_LIBDEBUG, "%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_LIBDEBUG, "%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_LIBDEBUG, "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 */
154