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/*-
* Copyright (c) 2002 Networks Associates Technology, Inc.
* All rights reserved.
*
* This software was developed for the FreeBSD Project by ThinkSec AS and
* NAI Labs, 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.
*
* $P4: //depot/projects/openpam/lib/openpam_load.c#13 $
*/
#include <dlfcn.h>
#include <stdlib.h>
#include <string.h>
#include <security/pam_appl.h>
#include "openpam_impl.h"
const char *_pam_sm_func_name[PAM_NUM_PRIMITIVES] = {
"pam_sm_authenticate",
"pam_sm_setcred",
"pam_sm_acct_mgmt",
"pam_sm_open_session",
"pam_sm_close_session",
"pam_sm_chauthtok"
};
static pam_module_t *modules;
/*
* Locate a matching dynamic or static module. Keep a list of previously
* found modules to speed up the process.
*/
static pam_module_t *
openpam_load_module(const char *path)
{
pam_module_t *module;
/* check cache first */
for (module = modules; module != NULL; module = module->next)
if (strcmp(module->path, path) == 0)
goto found;
/* nope; try to load */
module = openpam_dynamic(path);
openpam_log(PAM_LOG_DEBUG, "%s dynamic %s",
(module == NULL) ? "no" : "using", path);
#ifdef OPENPAM_STATIC_MODULES
/* look for a static module */
if (module == NULL && strchr(path, '/') == NULL) {
module = openpam_static(path);
openpam_log(PAM_LOG_DEBUG, "%s static %s",
(module == NULL) ? "no" : "using", path);
}
#endif
if (module == NULL) {
openpam_log(PAM_LOG_ERROR, "no %s found", path);
return (NULL);
}
openpam_log(PAM_LOG_DEBUG, "adding %s to cache", module->path);
module->next = modules;
if (module->next != NULL)
module->next->prev = module;
module->prev = NULL;
modules = module;
found:
++module->refcount;
return (module);
}
/*
* Release a module.
* XXX highly thread-unsafe
*/
static void
openpam_release_module(pam_module_t *module)
{
if (module == NULL)
return;
--module->refcount;
if (module->refcount > 0)
/* still in use */
return;
if (module->refcount < 0) {
openpam_log(PAM_LOG_ERROR, "module %s has negative refcount",
module->path);
module->refcount = 0;
}
if (module->dlh == NULL)
/* static module */
return;
dlclose(module->dlh);
if (module->prev != NULL)
module->prev->next = module->next;
if (module->next != NULL)
module->next->prev = module->prev;
if (module == modules)
modules = module->next;
openpam_log(PAM_LOG_DEBUG, "releasing %s", module->path);
free(module->path);
free(module);
}
/*
* Destroy a chain, freeing all its links and releasing the modules
* they point to.
*/
static void
openpam_destroy_chain(pam_chain_t *chain)
{
if (chain == NULL)
return;
openpam_destroy_chain(chain->next);
chain->next = NULL;
while (chain->optc--)
free(chain->optv[chain->optc]);
free(chain->optv);
openpam_release_module(chain->module);
free(chain);
}
/*
* Add a module to a chain.
*/
int
openpam_add_module(pam_chain_t *policy[],
int chain,
int flag,
const char *modpath,
int optc,
const char *optv[])
{
pam_chain_t *new, *iterator;
if ((new = calloc(1, sizeof *new)) == NULL)
goto buf_err;
if ((new->optv = malloc(sizeof(char *) * (optc + 1))) == NULL)
goto buf_err;
while (optc--)
if ((new->optv[new->optc++] = strdup(*optv++)) == NULL)
goto buf_err;
new->optv[new->optc] = NULL;
new->flag = flag;
if ((new->module = openpam_load_module(modpath)) == NULL) {
openpam_destroy_chain(new);
return (PAM_OPEN_ERR);
}
if ((iterator = policy[chain]) != NULL) {
while (iterator->next != NULL)
iterator = iterator->next;
iterator->next = new;
} else {
policy[chain] = new;
}
return (PAM_SUCCESS);
buf_err:
openpam_log(PAM_LOG_ERROR, "%m");
openpam_destroy_chain(new);
return (PAM_BUF_ERR);
}
/*
* Clear the chains and release the modules
*/
void
openpam_clear_chains(pam_chain_t *policy[])
{
int i;
for (i = 0; i < PAM_NUM_CHAINS; ++i)
openpam_destroy_chain(policy[i]);
}
/*
* NOPARSE
*/
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