1 /*
2 * Copyright (C) 2015 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 /* This file is used to define the properties of the filesystem
18 ** images generated by build tools (mkbootfs and mkyaffs2image) and
19 ** by the device side of adb.
20 */
21
22 #include <stdio.h>
23 #include <stdlib.h>
24 #include <string.h>
25 #include <sys/stat.h>
26
27 #include <selinux/android.h>
28 #include <selinux/label.h>
29 #include <selinux/selinux.h>
30
31 #include "android.h"
32 #include "private/android_filesystem_config.h"
33
34 #define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
35
alloc_mounted_path(const char * mount_point,const char * subpath,char ** mounted_path)36 void alloc_mounted_path(const char *mount_point, const char *subpath, char **mounted_path) {
37 *mounted_path = malloc(strlen(mount_point) + strlen(subpath) + 1);
38 if (*mounted_path == NULL) {
39 perror("Malloc Failure.");
40 exit(EXIT_FAILURE);
41 }
42 strcpy(*mounted_path, mount_point);
43 strcat(*mounted_path, subpath);
44 }
45
android_fs_config(const char * path,struct stat * stat,const char * target_out_path)46 void android_fs_config(const char *path, struct stat *stat, const char *target_out_path) {
47 unsigned long capabilities = 0;
48 fs_config(path, S_ISDIR(stat->st_mode), target_out_path,
49 &stat->st_uid, &stat->st_gid, &stat->st_mode, &capabilities);
50 }
51
52
get_sehnd(const char * context_file)53 struct selabel_handle *get_sehnd(const char *context_file) {
54 struct selinux_opt seopts[] = {
55 {
56 .type = SELABEL_OPT_PATH,
57 .value = context_file
58 }
59 };
60 struct selabel_handle *sehnd =
61 selabel_open(SELABEL_CTX_FILE, seopts, ARRAY_SIZE(seopts));
62
63 if (!sehnd) {
64 perror("Error running selabel_open.");
65 exit(EXIT_FAILURE);
66 }
67 return sehnd;
68 }
69
70
set_selabel(const char * path,unsigned int mode,struct selabel_handle * sehnd)71 char *set_selabel(const char *path, unsigned int mode, struct selabel_handle *sehnd) {
72 char *secontext;
73 if (sehnd != NULL) {
74 int full_name_size = strlen(path) + 2;
75 char* full_name = (char*) malloc(full_name_size);
76 if (full_name == NULL) {
77 perror("Malloc Failure.");
78 exit(EXIT_FAILURE);
79 }
80
81 full_name[0] = '/';
82 strncpy(full_name + 1, path, full_name_size - 1);
83
84 if (selabel_lookup(sehnd, &secontext, full_name, mode)) {
85 secontext = strdup("u:object_r:unlabeled:s0");
86 }
87
88 free(full_name);
89 return secontext;
90 }
91 perror("Selabel handle is NULL.");
92 exit(EXIT_FAILURE);
93 }
94