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_dynamic.c 408 2007-12-21 11:36:24Z des $
36 */
37
38#include <dlfcn.h>
39#include <stdio.h>
40#include <stdlib.h>
41#include <string.h>
42
43#include <security/pam_appl.h>
44
45#include "openpam_impl.h"
46
47#ifndef RTLD_NOW
48#define RTLD_NOW RTLD_LAZY
49#endif
50
51/*
52 * OpenPAM internal
53 *
54 * Locate a dynamically linked module
55 */
56
57pam_module_t *
58openpam_dynamic(const char *path)
59{
60	pam_module_t *module;
61	const char *prefix;
62	char *vpath;
63	void *dlh;
64	int i;
65
66	dlh = NULL;
67	if ((module = calloc(1, sizeof *module)) == NULL)
68		goto buf_err;
69
70	/* Prepend the standard prefix if not an absolute pathname. */
71	if (path[0] != '/')
72		prefix = OPENPAM_MODULES_DIR;
73	else
74		prefix = "";
75
76	/* try versioned module first, then unversioned module */
77	if (asprintf(&vpath, "%s%s.%d", prefix, path, LIB_MAJ) < 0)
78		goto buf_err;
79	if ((dlh = dlopen(vpath, RTLD_NOW)) == NULL) {
80		openpam_log(PAM_LOG_LIBDEBUG, "%s: %s", vpath, dlerror());
81		*strrchr(vpath, '.') = '\0';
82		if ((dlh = dlopen(vpath, RTLD_NOW)) == NULL) {
83			openpam_log(PAM_LOG_LIBDEBUG, "%s: %s", vpath, dlerror());
84			FREE(vpath);
85			FREE(module);
86			return (NULL);
87		}
88	}
89	FREE(vpath);
90	if ((module->path = strdup(path)) == NULL)
91		goto buf_err;
92	module->dlh = dlh;
93	for (i = 0; i < PAM_NUM_PRIMITIVES; ++i) {
94		module->func[i] = (pam_func_t)dlsym(dlh, _pam_sm_func_name[i]);
95		if (module->func[i] == NULL)
96			openpam_log(PAM_LOG_LIBDEBUG, "%s: %s(): %s",
97			    path, _pam_sm_func_name[i], dlerror());
98	}
99	return (module);
100 buf_err:
101	openpam_log(PAM_LOG_ERROR, "%m");
102	if (dlh != NULL)
103		dlclose(dlh);
104	FREE(module);
105	return (NULL);
106}
107
108/*
109 * NOPARSE
110 */
111