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/**
* @file eap_method.c
*
* @brief Generic constructor for eap_methods.
*
*/
/*
* Copyright (C) 2006 Martin Willi
* Hochschule fuer Technik Rapperswil
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
#include <string.h>
#include <sys/stat.h>
#include <dirent.h>
#include <error.h>
#include <dlfcn.h>
#include "eap_method.h"
#include <daemon.h>
#include <library.h>
#include <utils/linked_list.h>
#include <utils/identification.h>
ENUM_BEGIN(eap_type_names, EAP_IDENTITY, EAP_TOKEN_CARD,
"EAP_IDENTITY",
"EAP_NOTIFICATION",
"EAP_NAK",
"EAP_MD5",
"EAP_ONE_TIME_PASSWORD",
"EAP_TOKEN_CARD");
ENUM_NEXT(eap_type_names, EAP_SIM, EAP_SIM, EAP_TOKEN_CARD,
"EAP_SIM");
ENUM_NEXT(eap_type_names, EAP_AKA, EAP_AKA, EAP_SIM,
"EAP_AKA");
ENUM_END(eap_type_names, EAP_AKA);
ENUM(eap_code_names, EAP_REQUEST, EAP_FAILURE,
"EAP_REQUEST",
"EAP_RESPONSE",
"EAP_SUCCESS",
"EAP_FAILURE",
);
ENUM(eap_role_names, EAP_SERVER, EAP_PEER,
"EAP_SERVER",
"EAP_PEER",
);
typedef struct module_entry_t module_entry_t;
/**
* Representation of a loaded module: EAP type, library handle, constructor
*/
struct module_entry_t {
eap_type_t type;
void *handle;
eap_constructor_t constructor;
};
/** List of module_entry_t's */
static linked_list_t *modules = NULL;
/**
* unload modules at daemon shutdown
*/
void eap_method_unload()
{
if (modules)
{
module_entry_t *entry;
while (modules->remove_last(modules, (void**)&entry) == SUCCESS)
{
DBG2(DBG_CFG, "unloaded module for %s", eap_type_names, entry->type);
dlclose(entry->handle);
free(entry);
}
modules->destroy(modules);
modules = NULL;
}
}
/**
* Load EAP modules at daemon startup
*/
void eap_method_load(char *directory)
{
struct dirent* entry;
struct stat stb;
DIR* dir;
eap_method_unload();
modules = linked_list_create();
if (stat(directory, &stb) == -1 || !(stb.st_mode & S_IFDIR))
{
DBG1(DBG_CFG, "error opening EAP modules directory %s", directory);
return;
}
if (stb.st_uid != 0)
{
DBG1(DBG_CFG, "EAP modules directory %s not owned by root, skipped", directory);
return;
}
if (stb.st_mode & S_IWOTH || stb.st_mode & S_IWGRP)
{
DBG1(DBG_CFG, "EAP modules directory %s writable by others, skipped", directory);
return;
}
dir = opendir(directory);
if (dir == NULL)
{
DBG1(DBG_CFG, "error opening EAP modules directory %s", directory);
return;
}
DBG1(DBG_CFG, "loading EAP modules from '%s'", directory);
while ((entry = readdir(dir)) != NULL)
{
char file[256];
module_entry_t module, *loaded_module;
eap_method_t *method;
identification_t *id;
char *ending;
snprintf(file, sizeof(file), "%s/%s", directory, entry->d_name);
if (stat(file, &stb) == -1 || !(stb.st_mode & S_IFREG))
{
DBG2(DBG_CFG, " skipping %s, doesn't look like a file",
entry->d_name);
continue;
}
ending = entry->d_name + strlen(entry->d_name) - 3;
if (ending <= entry->d_name || !streq(ending, ".so"))
{
/* skip anything which does not look like a library */
DBG2(DBG_CFG, " skipping %s, doesn't look like a library",
entry->d_name);
continue;
}
if (stb.st_uid != 0)
{
DBG1(DBG_CFG, " skipping %s, file is not owned by root", entry->d_name);
return;
}
if (stb.st_mode & S_IWOTH || stb.st_mode & S_IWGRP)
{
DBG1(DBG_CFG, " skipping %s, file is writeable by others", entry->d_name);
continue;
}
/* try to load the library */
module.handle = dlopen(file, RTLD_LAZY);
if (module.handle == NULL)
{
DBG1(DBG_CFG, " opening EAP module %s failed: %s", entry->d_name,
dlerror());
continue;
}
module.constructor = dlsym(module.handle, "eap_create");
if (module.constructor == NULL)
{
DBG1(DBG_CFG, " EAP module %s has no eap_create() function, skipped",
entry->d_name);
dlclose(module.handle);
continue;
}
/* get the type implemented in the method, create an instance for it */
id = identification_create_from_string("john@doe.xyz");
method = module.constructor(EAP_SERVER, id, id);
if (method == NULL)
{
method = module.constructor(EAP_PEER, id, id);
}
id->destroy(id);
if (method == NULL)
{
DBG1(DBG_CFG, " unable to create instance of EAP method %s, skipped",
entry->d_name);
dlclose(module.handle);
continue;
}
module.type = method->get_type(method);
method->destroy(method);
DBG1(DBG_CFG, " loaded EAP method %N successfully from %s",
eap_type_names, module.type, entry->d_name);
loaded_module = malloc_thing(module_entry_t);
memcpy(loaded_module, &module, sizeof(module));
modules->insert_last(modules, loaded_module);
}
closedir(dir);
}
/*
* Described in header.
*/
eap_method_t *eap_method_create(eap_type_t type, eap_role_t role,
identification_t *server,
identification_t *peer)
{
eap_method_t *method = NULL;
iterator_t *iterator;
module_entry_t *entry;
iterator = modules->create_iterator(modules, TRUE);
while (iterator->iterate(iterator, (void**)&entry))
{
if (entry->type == type)
{
method = entry->constructor(role, server, peer);
if (method)
{
break;
}
}
}
iterator->destroy(iterator);
if (method == NULL)
{
DBG1(DBG_CFG, "no EAP module found for %N %N",
eap_type_names, type, eap_role_names, role);
}
return method;
}
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