source: openpam/trunk/lib/openpam_dynamic.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_dynamic.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 <stdio.h>
44#include <stdlib.h>
45#include <string.h>
46
47#include <security/pam_appl.h>
48
49#include "openpam_impl.h"
50
51#ifndef RTLD_NOW
52#define RTLD_NOW RTLD_LAZY
53#endif
54
55/*
56 * OpenPAM internal
57 *
58 * Locate a dynamically linked module
59 */
60
61pam_module_t *
62openpam_dynamic(const char *path)
63{
64        const pam_module_t *dlmodule;
65        pam_module_t *module;
66        const char *prefix;
67        char *vpath;
68        void *dlh;
69        int i;
70
71        dlh = NULL;
72
73        /* Prepend the standard prefix if not an absolute pathname. */
74        if (path[0] != '/')
75                prefix = OPENPAM_MODULES_DIR;
76        else
77                prefix = "";
78
79        /* try versioned module first, then unversioned module */
80        if (asprintf(&vpath, "%s%s.%d", prefix, path, LIB_MAJ) < 0)
81                goto err;
82        if ((dlh = dlopen(vpath, RTLD_NOW)) == NULL) {
83                openpam_log(PAM_LOG_DEBUG, "%s: %s", vpath, dlerror());
84                *strrchr(vpath, '.') = '\0';
85                if ((dlh = dlopen(vpath, RTLD_NOW)) == NULL) {
86                        openpam_log(PAM_LOG_DEBUG, "%s: %s", vpath, dlerror());
87                        FREE(vpath);
88                        return (NULL);
89                }
90        }
91        FREE(vpath);
92        if ((module = calloc(1, sizeof *module)) == NULL)
93                goto buf_err;
94        if ((module->path = strdup(path)) == NULL)
95                goto buf_err;
96        module->dlh = dlh;
97        dlmodule = dlsym(dlh, "_pam_module");
98        for (i = 0; i < PAM_NUM_PRIMITIVES; ++i) {
99                module->func[i] = dlmodule ? dlmodule->func[i] :
100                    (pam_func_t)dlsym(dlh, _pam_sm_func_name[i]);
101                if (module->func[i] == NULL)
102                        openpam_log(PAM_LOG_DEBUG, "%s: %s(): %s",
103                            path, _pam_sm_func_name[i], dlerror());
104        }
105        return (module);
106buf_err:
107        if (dlh != NULL)
108                dlclose(dlh);
109        FREE(module);
110err:
111        openpam_log(PAM_LOG_ERROR, "%m");
112        return (NULL);
113}
114
115/*
116 * NOPARSE
117 */
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