source: openpam/trunk/lib/openpam_dynamic.c @ 502

Last change on this file since 502 was 502, checked in by des, 3 years ago

Use openpam_check_path_owner_perms()

  • Property svn:keywords set to Id
File size: 3.6 KB
Line 
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 * $Id$
36 */
37
38#ifdef HAVE_CONFIG_H
39# include "config.h"
40#endif
41
42#include <dlfcn.h>
43#include <errno.h>
44#include <stdio.h>
45#include <stdlib.h>
46#include <string.h>
47#include <unistd.h>
48
49#include <security/pam_appl.h>
50
51#include "openpam_impl.h"
52
53#ifndef RTLD_NOW
54#define RTLD_NOW RTLD_LAZY
55#endif
56
57/*
58 * OpenPAM internal
59 *
60 * Perform sanity checks and attempt to load a module
61 */
62
63static void *
64try_dlopen(const char *modfn)
65{
66
67        if (openpam_check_path_owner_perms(modfn) != 0)
68                return (NULL);
69        return (dlopen(modfn, RTLD_NOW));
70}
71   
72/*
73 * OpenPAM internal
74 *
75 * Locate a dynamically linked module
76 */
77
78pam_module_t *
79openpam_dynamic(const char *path)
80{
81        const pam_module_t *dlmodule;
82        pam_module_t *module;
83        const char *prefix;
84        char *vpath;
85        void *dlh;
86        int i, serrno;
87
88        dlh = NULL;
89
90        /* Prepend the standard prefix if not an absolute pathname. */
91        if (path[0] != '/')
92                prefix = OPENPAM_MODULES_DIR;
93        else
94                prefix = "";
95
96        /* try versioned module first, then unversioned module */
97        if (asprintf(&vpath, "%s%s.%d", prefix, path, LIB_MAJ) < 0)
98                goto err;
99        if ((dlh = try_dlopen(vpath)) == NULL && errno == ENOENT) {
100                *strrchr(vpath, '.') = '\0';
101                dlh = try_dlopen(vpath);
102        }
103        serrno = errno;
104        FREE(vpath);
105        errno = serrno;
106        if (dlh == NULL)
107                goto err;
108        if ((module = calloc(1, sizeof *module)) == NULL)
109                goto buf_err;
110        if ((module->path = strdup(path)) == NULL)
111                goto buf_err;
112        module->dlh = dlh;
113        dlmodule = dlsym(dlh, "_pam_module");
114        for (i = 0; i < PAM_NUM_PRIMITIVES; ++i) {
115                module->func[i] = dlmodule ? dlmodule->func[i] :
116                    (pam_func_t)dlsym(dlh, pam_sm_func_name[i]);
117                if (module->func[i] == NULL)
118                        openpam_log(PAM_LOG_DEBUG, "%s: %s(): %s",
119                            path, pam_sm_func_name[i], dlerror());
120        }
121        return (module);
122buf_err:
123        if (dlh != NULL)
124                dlclose(dlh);
125        FREE(module);
126err:
127        openpam_log(PAM_LOG_ERROR, "%m");
128        return (NULL);
129}
130
131/*
132 * NOPARSE
133 */
Note: See TracBrowser for help on using the repository browser.