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/*
* Copyright (c) 2013 Samsung Electronics Co., Ltd All Rights Reserved
*
* Licensed under the Apache License, Version 2.0 (the License);
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an AS IS BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdlib.h>
#include <errno.h>
#include <sys/statfs.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <sys/smack.h>
#include <download-provider.h>
#include <download-provider-log.h>
#include <download-provider-utils.h>
#define SMACKFS_MAGIC 0x43415d53
#define SMACKFS_MNT "/smack"
static int __dp_smack_is_transmute(char *path)
{
char *dir_label = NULL;
int ret = -1;
if (smack_getlabel(path, &dir_label, SMACK_LABEL_TRANSMUTE) == 0 &&
dir_label != NULL) {
if (strncmp(dir_label, "TRUE", strlen(dir_label)) == 0)
ret = 0;
}
free(dir_label);
return ret;
}
int dp_smack_is_mounted()
{
struct statfs sfs;
int ret;
do {
ret = statfs(SMACKFS_MNT, &sfs);
} while (ret < 0 && errno == EINTR);
if (ret) {
TRACE_ERROR("[SMACK ERROR]");
return -1;
}
if (sfs.f_type == SMACKFS_MAGIC) {
return 1;
}
TRACE_ERROR("[SMACK DISABLE]");
return 0;
}
int dp_smack_set_label(char *label, char *source, char *target)
{
if (label == NULL || source == NULL || target == NULL)
return DP_ERROR_PERMISSION_DENIED;
int is_setted_dir_label = 0;
int errorcode = DP_ERROR_NONE;
if (__dp_smack_is_transmute(source) < 0) {
TRACE_SECURE_ERROR("[SMACK] no transmute:%s", source);
} else {
char *dir_label = NULL;
if (smack_getlabel(source, &dir_label, SMACK_LABEL_ACCESS) == 0) {
if (smack_have_access(label, dir_label, "t") > 0) {
if (smack_setlabel(target, dir_label, SMACK_LABEL_ACCESS) != 0) {
TRACE_SECURE_ERROR("[SMACK ERROR] label:%s", dir_label);
errorcode = DP_ERROR_PERMISSION_DENIED;
} else {
is_setted_dir_label = 1;
}
} else {
TRACE_SECURE_ERROR("[SMACK ERROR] access:%s/%s", label, dir_label);
errorcode = DP_ERROR_PERMISSION_DENIED;
}
} else {
TRACE_SECURE_ERROR("[SMACK ERROR] no label:", source);
errorcode = DP_ERROR_PERMISSION_DENIED;
}
free(dir_label);
}
if (is_setted_dir_label == 0 &&
smack_setlabel(target, label, SMACK_LABEL_ACCESS) != 0) {
TRACE_SECURE_ERROR("[SMACK ERROR] label:%s", label);
errorcode = DP_ERROR_PERMISSION_DENIED;
// remove file.
if (dp_is_file_exist(target) == 0)
unlink(target);
}
return errorcode;
}
char *dp_smack_get_label_from_socket(int sock)
{
char *label = NULL;
if (smack_new_label_from_socket(sock, &label) != 0) {
free(label);
return NULL;
}
return label;
}
int dp_smack_is_valid_dir(int uid, int gid, char *smack_label, char *dir)
{
if (smack_label == NULL || dir == NULL) {
TRACE_ERROR("check parameter %s/%s", smack_label, dir);
return -1;
}
int ret = -1;
struct stat dstate;
if (stat(dir, &dstate) == 0) {
if ((dstate.st_uid == uid && (dstate.st_mode & (S_IRUSR | S_IWUSR)) == (S_IRUSR | S_IWUSR)) ||
(dstate.st_gid == gid && (dstate.st_mode & (S_IRGRP | S_IWGRP)) == (S_IRGRP | S_IWGRP)) ||
((dstate.st_mode & (S_IROTH | S_IWOTH)) == (S_IROTH | S_IWOTH))) {
char *dir_label = NULL;
if (smack_getlabel(dir, &dir_label, SMACK_LABEL_ACCESS) == 0 &&
smack_have_access(smack_label, dir_label, "rw") > 0) {
ret = 0;
}
free(dir_label);
}
}
return ret;
}
int dp_is_valid_dir(const char *dirpath)
{
struct stat dir_state;
int stat_ret;
if (dirpath == NULL) {
TRACE_ERROR("check path");
return -1;
}
stat_ret = stat(dirpath, &dir_state);
if (stat_ret == 0 && S_ISDIR(dir_state.st_mode)) {
return 0;
}
return -1;
}
void dp_rebuild_dir(const char *dirpath, mode_t mode)
{
if (dp_is_valid_dir(dirpath) < 0) {
if (mkdir(dirpath, mode) == 0) {
TRACE_INFO("check directory:%s", dirpath);
if (smack_setlabel(dirpath, "_", SMACK_LABEL_ACCESS) != 0) {
TRACE_SECURE_ERROR("failed to set smack label:%s", dirpath);
}
} else {
TRACE_STRERROR("failed to create directory:%s", dirpath);
}
}
}
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