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/*
* Copyright (C) 2015 The Android Open Source Project
*
* 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.
*/
/* This file is used to define the properties of the filesystem
** images generated by build tools (mkbootfs and mkyaffs2image) and
** by the device side of adb.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <selinux/label.h>
#include <selinux/selinux.h>
#include "android.h"
#include "private/android_filesystem_config.h"
#include "private/canned_fs_config.h"
#define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
void alloc_mounted_path(const char *mount_point, const char *subpath, char **mounted_path) {
*mounted_path = malloc(strlen(mount_point) + strlen(subpath) + 1);
if (*mounted_path == NULL) {
perror("Malloc Failure.");
exit(EXIT_FAILURE);
}
strcpy(*mounted_path, mount_point);
strcat(*mounted_path, subpath);
}
void android_fs_config(fs_config_func_t fs_config_func, const char *path, struct stat *stat,
const char *target_out_path, uint64_t *capabilities) {
// filesystem_config does not preserve file type bits
mode_t stat_file_type_mask = stat->st_mode & S_IFMT;
unsigned int uid = 0, gid = 0, mode = 0;
if (fs_config_func) {
fs_config_func(path, S_ISDIR(stat->st_mode), target_out_path,
&uid, &gid, &mode, capabilities);
stat->st_uid = uid;
stat->st_gid = gid;
stat->st_mode = mode;
}
stat->st_mode |= stat_file_type_mask;
}
struct selabel_handle *get_sehnd(const char *context_file) {
struct selinux_opt seopts[] = {
{
.type = SELABEL_OPT_PATH,
.value = context_file
}
};
struct selabel_handle *sehnd =
selabel_open(SELABEL_CTX_FILE, seopts, ARRAY_SIZE(seopts));
if (!sehnd) {
perror("Error running selabel_open.");
exit(EXIT_FAILURE);
}
return sehnd;
}
char *set_selabel(const char *path, unsigned int mode, struct selabel_handle *sehnd) {
char *secontext;
if (sehnd != NULL) {
int full_name_size = strlen(path) + 2;
char* full_name = (char*) malloc(full_name_size);
if (full_name == NULL) {
perror("Malloc Failure.");
exit(EXIT_FAILURE);
}
full_name[0] = '/';
strncpy(full_name + 1, path, full_name_size - 1);
if (selabel_lookup(sehnd, &secontext, full_name, mode)) {
secontext = strdup("u:object_r:unlabeled:s0");
}
free(full_name);
return secontext;
}
perror("Selabel handle is NULL.");
exit(EXIT_FAILURE);
}
struct vfs_cap_data set_caps(uint64_t capabilities) {
struct vfs_cap_data cap_data;
memset(&cap_data, 0, sizeof(cap_data));
if (capabilities == 0)
return cap_data;
cap_data.magic_etc = VFS_CAP_REVISION_2 | VFS_CAP_FLAGS_EFFECTIVE;
cap_data.data[0].permitted = (uint32_t) capabilities;
cap_data.data[0].inheritable = 0;
cap_data.data[1].permitted = (uint32_t) (capabilities >> 32);
cap_data.data[1].inheritable = 0;
return cap_data;
}
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