source: openpam/trunk/lib/openpam_load.c @ 437

Last change on this file since 437 was 437, checked in by Dag-Erling Smørgrav, 9 years ago

Update copyright and release notes.

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1/*-
2 * Copyright (c) 2002-2003 Networks Associates Technology, Inc.
3 * Copyright (c) 2004-2011 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 437 2011-09-13 12:00:13Z 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
50const char *_pam_func_name[PAM_NUM_PRIMITIVES] = {
51        "pam_authenticate",
52        "pam_setcred",
53        "pam_acct_mgmt",
54        "pam_open_session",
55        "pam_close_session",
56        "pam_chauthtok"
57};
58
59const char *_pam_sm_func_name[PAM_NUM_PRIMITIVES] = {
60        "pam_sm_authenticate",
61        "pam_sm_setcred",
62        "pam_sm_acct_mgmt",
63        "pam_sm_open_session",
64        "pam_sm_close_session",
65        "pam_sm_chauthtok"
66};
67
68/*
69 * Locate a matching dynamic or static module.
70 */
71
72pam_module_t *
73openpam_load_module(const char *path)
74{
75        pam_module_t *module;
76
77        module = openpam_dynamic(path);
78        openpam_log(PAM_LOG_DEBUG, "%s dynamic %s",
79            (module == NULL) ? "no" : "using", path);
80
81#ifdef OPENPAM_STATIC_MODULES
82        /* look for a static module */
83        if (module == NULL && strchr(path, '/') == NULL) {
84                module = openpam_static(path);
85                openpam_log(PAM_LOG_DEBUG, "%s static %s",
86                    (module == NULL) ? "no" : "using", path);
87        }
88#endif
89        if (module == NULL) {
90                openpam_log(PAM_LOG_ERROR, "no %s found", path);
91                return (NULL);
92        }
93        return (module);
94}
95
96
97/*
98 * Release a module.
99 * XXX highly thread-unsafe
100 */
101
102static void
103openpam_release_module(pam_module_t *module)
104{
105        if (module == NULL)
106                return;
107        if (module->dlh == NULL)
108                /* static module */
109                return;
110        dlclose(module->dlh);
111        openpam_log(PAM_LOG_DEBUG, "releasing %s", module->path);
112        FREE(module->path);
113        FREE(module);
114}
115
116
117/*
118 * Destroy a chain, freeing all its links and releasing the modules
119 * they point to.
120 */
121
122static void
123openpam_destroy_chain(pam_chain_t *chain)
124{
125        if (chain == NULL)
126                return;
127        openpam_destroy_chain(chain->next);
128        chain->next = NULL;
129        while (chain->optc) {
130                --chain->optc;
131                FREE(chain->optv[chain->optc]);
132        }
133        FREE(chain->optv);
134        openpam_release_module(chain->module);
135        chain->module = NULL;
136        FREE(chain);
137}
138
139
140/*
141 * Clear the chains and release the modules
142 */
143
144void
145openpam_clear_chains(pam_chain_t *policy[])
146{
147        int i;
148
149        for (i = 0; i < PAM_NUM_FACILITIES; ++i) {
150                openpam_destroy_chain(policy[i]);
151                policy[i] = NULL;
152        }
153}
154
155/*
156 * NOPARSE
157 */
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