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