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/**
* @file
*
* Public interface for SELinux policies.
*
* @author Jeremy A. Mowery jmowery@tresys.com
* @author Jason Tang jtang@tresys.com
*
* Copyright (C) 2006-2007 Tresys Technology, LLC
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "policy-query-internal.h"
#include <apol/perm-map.h>
#include <apol/domain-trans-analysis.h>
#include <qpol/policy.h>
#include <qpol/policy_extend.h>
#include <errno.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
static void apol_handle_default_callback(void *varg __attribute__ ((unused)), const apol_policy_t * p
__attribute__ ((unused)), int level, const char *fmt, va_list va_args)
{
switch (level) {
case APOL_MSG_INFO:
{
/* by default do not display these messages */
return;
}
case APOL_MSG_WARN:
{
fprintf(stderr, "WARNING: ");
break;
}
case APOL_MSG_ERR:
default:
{
fprintf(stderr, "ERROR: ");
break;
}
}
vfprintf(stderr, fmt, va_args);
fprintf(stderr, "\n");
}
static void qpol_handle_route_to_callback(void *varg, const qpol_policy_t * policy
__attribute__ ((unused)), int level, const char *fmt, va_list ap)
{
apol_policy_t *p = (apol_policy_t *) varg;
if (p == NULL) {
apol_handle_default_callback(NULL, NULL, level, fmt, ap);
} else if (p->msg_callback != NULL) {
p->msg_callback(p->msg_callback_arg, p, level, fmt, ap);
}
}
apol_policy_t *apol_policy_create_from_policy_path(const apol_policy_path_t * path, const int options,
apol_callback_fn_t msg_callback, void *varg)
{
apol_policy_t *policy;
const char *primary_path;
int policy_type;
if (!path) {
errno = EINVAL;
return NULL;
}
if (!(policy = calloc(1, sizeof(apol_policy_t)))) {
ERR(NULL, "%s", strerror(ENOMEM));
return NULL; /* errno set by calloc */
}
if (msg_callback != NULL) {
policy->msg_callback = msg_callback;
} else {
policy->msg_callback = apol_handle_default_callback;
}
policy->msg_callback_arg = varg;
primary_path = apol_policy_path_get_primary(path);
INFO(policy, "Loading policy %s.", primary_path);
policy_type = qpol_policy_open_from_file(primary_path, &policy->p, qpol_handle_route_to_callback, policy, options);
if (policy_type < 0) {
ERR(policy, "Unable to open policy %s.", primary_path);
apol_policy_destroy(&policy);
return NULL; /* qpol sets errno */
}
policy->policy_type = policy_type;
if (apol_policy_path_get_type(path) == APOL_POLICY_PATH_TYPE_MODULAR) {
if (!qpol_policy_has_capability(policy->p, QPOL_CAP_MODULES)) {
INFO(policy, "%s is not a base policy.", primary_path);
return policy;
}
const apol_vector_t *modules = apol_policy_path_get_modules(path);
size_t i;
for (i = 0; i < apol_vector_get_size(modules); i++) {
const char *module_path = apol_vector_get_element(modules, i);
qpol_module_t *mod = NULL;
INFO(policy, "Loading module %s.", module_path);
if (qpol_module_create_from_file(module_path, &mod)) {
ERR(policy, "Error loading module %s.", module_path);
apol_policy_destroy(&policy);
return NULL;
}
if (qpol_policy_append_module(policy->p, mod)) {
ERR(policy, "Error loading module %s.", module_path);
apol_policy_destroy(&policy);
qpol_module_destroy(&mod);
return NULL;
}
}
INFO(policy, "%s", "Linking modules into base policy.");
if (qpol_policy_rebuild(policy->p, options)) {
apol_policy_destroy(&policy);
return NULL;
}
}
return policy;
}
void apol_policy_destroy(apol_policy_t ** policy)
{
if (policy != NULL && *policy != NULL) {
qpol_policy_destroy(&((*policy)->p));
permmap_destroy(&(*policy)->pmap);
domain_trans_table_destroy(&(*policy)->domain_trans_table);
free(*policy);
*policy = NULL;
}
}
int apol_policy_get_policy_type(const apol_policy_t * policy)
{
if (policy == NULL) {
errno = EINVAL;
return -1;
}
return policy->policy_type;
}
qpol_policy_t *apol_policy_get_qpol(const apol_policy_t * policy)
{
if (policy == NULL) {
errno = EINVAL;
return NULL;
}
return policy->p;
}
int apol_policy_is_mls(const apol_policy_t * p)
{
if (p == NULL) {
return -1;
}
return qpol_policy_has_capability(p->p, QPOL_CAP_MLS);
}
char *apol_policy_get_version_type_mls_str(const apol_policy_t * p)
{
unsigned int version;
char *policy_type, *mls, buf[64];
if (qpol_policy_get_policy_version(p->p, &version) < 0) {
return NULL;
}
switch (p->policy_type) {
case QPOL_POLICY_KERNEL_SOURCE:
policy_type = "source";
break;
case QPOL_POLICY_KERNEL_BINARY:
policy_type = "binary";
break;
case QPOL_POLICY_MODULE_BINARY:
policy_type = "modular";
break;
default:
policy_type = "unknown";
break;
}
if (qpol_policy_has_capability(p->p, QPOL_CAP_MLS)) {
mls = "mls";
} else {
mls = "non-mls";
}
if (snprintf(buf, sizeof(buf), "v.%u (%s, %s)", version, policy_type, mls) == -1) {
return NULL;
}
return strdup(buf);
}
void apol_handle_msg(const apol_policy_t * p, int level, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
if (p == NULL) {
apol_handle_default_callback(NULL, NULL, level, fmt, ap);
} else if (p->msg_callback != NULL) {
p->msg_callback(p->msg_callback_arg, p, level, fmt, ap);
}
va_end(ap);
}
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