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/*-
* Copyright (c) 2002-2003 Networks Associates Technology, Inc.
* Copyright (c) 2004-2011 Dag-Erling Smørgrav
* All rights reserved.
*
* This software was developed for the FreeBSD Project by ThinkSec AS and
* Network Associates Laboratories, the Security Research Division of
* Network Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035
* ("CBOSS"), as part of the DARPA CHATS research program.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: openpam_dynamic.c 502 2011-12-18 13:59:22Z des $
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <dlfcn.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <security/pam_appl.h>
#include "openpam_impl.h"
#ifndef RTLD_NOW
#define RTLD_NOW RTLD_LAZY
#endif
/*
* OpenPAM internal
*
* Perform sanity checks and attempt to load a module
*/
static void *
try_dlopen(const char *modfn)
{
if (openpam_check_path_owner_perms(modfn) != 0)
return (NULL);
return (dlopen(modfn, RTLD_NOW));
}
/*
* OpenPAM internal
*
* Locate a dynamically linked module
*/
pam_module_t *
openpam_dynamic(const char *path)
{
const pam_module_t *dlmodule;
pam_module_t *module;
const char *prefix;
char *vpath;
void *dlh;
int i, serrno;
dlh = NULL;
/* Prepend the standard prefix if not an absolute pathname. */
if (path[0] != '/')
prefix = OPENPAM_MODULES_DIR;
else
prefix = "";
/* try versioned module first, then unversioned module */
if (asprintf(&vpath, "%s%s.%d", prefix, path, LIB_MAJ) < 0)
goto err;
if ((dlh = try_dlopen(vpath)) == NULL && errno == ENOENT) {
*strrchr(vpath, '.') = '\0';
dlh = try_dlopen(vpath);
}
serrno = errno;
FREE(vpath);
errno = serrno;
if (dlh == NULL)
goto err;
if ((module = calloc(1, sizeof *module)) == NULL)
goto buf_err;
if ((module->path = strdup(path)) == NULL)
goto buf_err;
module->dlh = dlh;
dlmodule = dlsym(dlh, "_pam_module");
for (i = 0; i < PAM_NUM_PRIMITIVES; ++i) {
module->func[i] = dlmodule ? dlmodule->func[i] :
(pam_func_t)dlsym(dlh, pam_sm_func_name[i]);
if (module->func[i] == NULL)
openpam_log(PAM_LOG_DEBUG, "%s: %s(): %s",
path, pam_sm_func_name[i], dlerror());
}
return (module);
buf_err:
if (dlh != NULL)
dlclose(dlh);
FREE(module);
err:
openpam_log(PAM_LOG_ERROR, "%m");
return (NULL);
}
/*
* NOPARSE
*/
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