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/**
* @file
* Implementation of the users without roles module.
*
* @author Kevin Carr kcarr@tresys.com
* @author Jeremy A. Mowery jmowery@tresys.com
* @author Jason Tang jtang@tresys.com
*
* Copyright (C) 2005-2007 Tresys Technology, LLC
*
* 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.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "users_wo_roles.h"
#include <stdio.h>
#include <string.h>
#include <errno.h>
/* This string is the name of the module and should match the stem
* of the file name; it should also match the prefix of all functions
* defined in this module and the private data storage structure */
static const char *const mod_name = "users_wo_roles";
/* The register function registers all of a module's functions
* with the library. */
int users_wo_roles_register(sechk_lib_t * lib)
{
sechk_module_t *mod = NULL;
sechk_fn_t *fn_struct = NULL;
if (!lib) {
ERR(NULL, "%s", "No library");
errno = EINVAL;
return -1;
}
/* Modules are declared by the config file and their name and options
* are stored in the module array. The name is looked up to determine
* where to store the function structures */
mod = sechk_lib_get_module(mod_name, lib);
if (!mod) {
ERR(NULL, "%s", "Module unknown");
errno = EINVAL;
return -1;
}
mod->parent_lib = lib;
/* assign the descriptions */
mod->brief_description = "users with no roles";
mod->detailed_description =
"--------------------------------------------------------------------------------\n"
"This module finds all the SELinux users in the policy that have no associated\n"
"roles. Users without roles may appear in the label of a file system object;\n"
"however, these users cannot login to the system or run any process. Since these\n"
"users cannot be used on the system, a policy change is recomended to remove the\n"
"users or provide some intended access.\n";
mod->opt_description =
" Module requirements:\n" " none\n" " Module dependencies:\n" " none\n" " Module options:\n" " none\n";
mod->severity = SECHK_SEV_LOW;
/* register functions */
fn_struct = sechk_fn_new();
if (!fn_struct) {
ERR(NULL, "%s", strerror(ENOMEM));
errno = ENOMEM;
return -1;
}
fn_struct->name = strdup(SECHK_MOD_FN_INIT);
if (!fn_struct->name) {
ERR(NULL, "%s", strerror(ENOMEM));
errno = ENOMEM;
return -1;
}
fn_struct->fn = users_wo_roles_init;
if (apol_vector_append(mod->functions, (void *)fn_struct) < 0) {
ERR(NULL, "%s", strerror(ENOMEM));
errno = ENOMEM;
return -1;
}
fn_struct = sechk_fn_new();
if (!fn_struct) {
ERR(NULL, "%s", strerror(ENOMEM));
errno = ENOMEM;
return -1;
}
fn_struct->name = strdup(SECHK_MOD_FN_RUN);
if (!fn_struct->name) {
ERR(NULL, "%s", strerror(ENOMEM));
errno = ENOMEM;
return -1;
}
fn_struct->fn = users_wo_roles_run;
if (apol_vector_append(mod->functions, (void *)fn_struct) < 0) {
ERR(NULL, "%s", strerror(ENOMEM));
errno = ENOMEM;
return -1;
}
mod->data_free = NULL;
fn_struct = sechk_fn_new();
if (!fn_struct) {
ERR(NULL, "%s", strerror(ENOMEM));
errno = ENOMEM;
return -1;
}
fn_struct->name = strdup(SECHK_MOD_FN_PRINT);
if (!fn_struct->name) {
ERR(NULL, "%s", strerror(ENOMEM));
errno = ENOMEM;
return -1;
}
fn_struct->fn = users_wo_roles_print;
if (apol_vector_append(mod->functions, (void *)fn_struct) < 0) {
ERR(NULL, "%s", strerror(ENOMEM));
errno = ENOMEM;
return -1;
}
return 0;
}
/* The init function creates the module's private data storage object
* and initializes its values based on the options parsed in the config
* file. */
int users_wo_roles_init(sechk_module_t * mod, apol_policy_t * policy, void *arg __attribute__ ((unused)))
{
if (!mod || !policy) {
ERR(policy, "%s", "Invalid parameters");
errno = EINVAL;
return -1;
}
if (strcmp(mod_name, mod->name)) {
ERR(policy, "Wrong module (%s)", mod->name);
errno = EINVAL;
return -1;
}
mod->data = NULL;
return 0;
}
/* The run function performs the check. This function runs only once
* even if called multiple times. All test logic should be placed below
* as instructed. This function allocates the result structure and fills
* in all relavant item and proof data. */
int users_wo_roles_run(sechk_module_t * mod, apol_policy_t * policy, void *arg __attribute__ ((unused)))
{
sechk_result_t *res = NULL;
sechk_item_t *item = NULL;
sechk_proof_t *proof = NULL;
size_t i;
apol_vector_t *user_vector;
int error = 0;
if (!mod || !policy) {
ERR(policy, "%s", "Invalid parameters");
errno = EINVAL;
return -1;
}
if (strcmp(mod_name, mod->name)) {
ERR(policy, "Wrong module (%s)", mod->name);
errno = EINVAL;
return -1;
}
/* if already run return */
if (mod->result)
return 0;
res = sechk_result_new();
if (!res) {
ERR(policy, "%s", strerror(ENOMEM));
errno = ENOMEM;
return -1;
}
res->test_name = strdup(mod_name);
if (!res->test_name) {
error = errno;
ERR(policy, "%s", strerror(ENOMEM));
goto users_wo_roles_run_fail;
}
res->item_type = SECHK_ITEM_USER;
if (!(res->items = apol_vector_create(sechk_item_free))) {
error = errno;
ERR(policy, "%s", strerror(ENOMEM));
goto users_wo_roles_run_fail;
}
apol_user_get_by_query(policy, NULL, &user_vector);
for (i = 0; i < apol_vector_get_size(user_vector); i++) {
qpol_user_t *user;
qpol_iterator_t *role_iter;
user = apol_vector_get_element(user_vector, i);
qpol_user_get_role_iter(apol_policy_get_qpol(policy), user, &role_iter);
if (!qpol_iterator_end(role_iter)) {
qpol_iterator_destroy(&role_iter);
continue;
}
qpol_iterator_destroy(&role_iter);
proof = sechk_proof_new(NULL);
if (!proof) {
error = errno;
ERR(policy, "%s", strerror(ENOMEM));
goto users_wo_roles_run_fail;
}
proof->type = SECHK_ITEM_USER;
proof->text = "User has no roles.\n";
item = sechk_item_new(NULL);
if (!item) {
error = errno;
ERR(policy, "%s", strerror(ENOMEM));
goto users_wo_roles_run_fail;
}
item->item = (void *)user;
if (!item->proof) {
if (!(item->proof = apol_vector_create(sechk_proof_free))) {
error = errno;
ERR(policy, "%s", strerror(ENOMEM));
goto users_wo_roles_run_fail;
}
}
if (apol_vector_append(item->proof, (void *)proof) < 0) {
error = errno;
ERR(policy, "%s", strerror(ENOMEM));
goto users_wo_roles_run_fail;
}
if (apol_vector_append(res->items, (void *)item) < 0) {
error = errno;
ERR(policy, "%s", strerror(ENOMEM));
goto users_wo_roles_run_fail;
}
}
apol_vector_destroy(&user_vector);
mod->result = res;
if (apol_vector_get_size(res->items))
return 1;
return 0;
users_wo_roles_run_fail:
sechk_proof_free(proof);
sechk_item_free(item);
sechk_result_destroy(&res);
errno = error;
return -1;
}
/* The print output function generates the text printed in the
* report and prints it to stdout. */
int users_wo_roles_print(sechk_module_t * mod, apol_policy_t * policy, void *arg __attribute__ ((unused)))
{
unsigned char outformat = 0x00;
sechk_item_t *item = NULL;
size_t i = 0, j = 0, num_items;
const qpol_user_t *user;
const char *user_name;
if (!mod || !policy) {
ERR(policy, "%s", "Invalid parameters");
errno = EINVAL;
return -1;
}
if (strcmp(mod_name, mod->name)) {
ERR(policy, "Wrong module (%s)", mod->name);
errno = EINVAL;
return -1;
}
outformat = mod->outputformat;
num_items = apol_vector_get_size(mod->result->items);
if (!outformat || (outformat & SECHK_OUT_QUIET))
return 0; /* not an error - no output is requested */
if (!mod->result) {
ERR(policy, "%s", "Module has not been run");
errno = EINVAL;
return -1;
}
/* display the statistics of the results */
if (outformat & SECHK_OUT_STATS) {
printf("Found %zd users.\n", num_items);
}
if (outformat & SECHK_OUT_PROOF) {
printf("\nThe following users have no associated roles.\n");
}
/* The list report component is a display of all items
* found without any supporting proof. */
if (outformat & (SECHK_OUT_LIST | SECHK_OUT_PROOF)) {
printf("\n");
for (i = 0; i < num_items; i++) {
j++;
j %= 4;
item = apol_vector_get_element(mod->result->items, i);
user = (qpol_user_t *) item->item;
qpol_user_get_name(apol_policy_get_qpol(policy), user, &user_name);
printf("%s%s", user_name, (char *)((j && i != num_items - 1) ? ", " : "\n"));
}
printf("\n");
}
return 0;
}
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