source: openpam/trunk/lib/openpam_dynamic.c @ 87

Last change on this file since 87 was 87, checked in by Dag-Erling Smørgrav, 19 years ago

Move most of the dynamic loader code into a separate file, and add
support for module versioning. OpenPAM will prefer a PAM module with
the same version number as the library itself to one with no version
number at all.

Sponsored by: DARPA, NAI Labs

File size: 2.9 KB
Line 
1/*-
2 * Copyright (c) 2002 Networks Associates Technologies, Inc.
3 * All rights reserved.
4 *
5 * This software was developed for the FreeBSD Project by ThinkSec AS and
6 * NAI Labs, the Security Research Division of Network Associates, Inc.
7 * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
8 * DARPA CHATS research program.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. The name of the author may not be used to endorse or promote
19 *    products derived from this software without specific prior written
20 *    permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 * $P4: //depot/projects/openpam/lib/openpam_dynamic.c#1 $
35 */
36
37#include <dlfcn.h>
38#include <stdio.h>
39#include <stdlib.h>
40#include <string.h>
41
42#include <security/pam_appl.h>
43
44#include "openpam_impl.h"
45
46/*
47 * OpenPAM internal
48 *
49 * Locate a dynamically linked module
50 */
51
52pam_module_t *
53openpam_dynamic(const char *path)
54{
55        pam_module_t *module;
56        char *vpath;
57        void *dlh;
58        int i;
59
60        if ((module = calloc(1, sizeof *module)) == NULL)
61                goto buf_err;
62
63        /* try versioned module first, then unversioned module */
64        if (asprintf(&vpath, "%s.%d", path, LIB_MAJ) == -1)
65                goto buf_err;
66        if ((dlh = dlopen(vpath, RTLD_NOW)) == NULL) {
67                openpam_log(PAM_LOG_ERROR, "dlopen(): %s", dlerror());
68                *strrchr(vpath, '.') = '\0';
69                if ((dlh = dlopen(vpath, RTLD_NOW)) == NULL) {
70                        openpam_log(PAM_LOG_ERROR, "dlopen(): %s", dlerror());
71                        free(module);
72                        return (NULL);
73                }
74        }
75        module->path = vpath;
76        module->dlh = dlh;
77        for (i = 0; i < PAM_NUM_PRIMITIVES; ++i)
78                module->func[i] = dlsym(dlh, _pam_sm_func_name[i]);
79        return (module);
80 buf_err:
81        openpam_log(PAM_LOG_ERROR, "%m");
82        dlclose(dlh);
83        free(module);
84        return (NULL);
85}
86
87/*
88 * NOPARSE
89 */
Note: See TracBrowser for help on using the repository browser.