2 * Copyright (C) 2008 The Android Open Source Project
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
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
25 #include <selinux/selinux.h>
26 #include <selinux/label.h>
28 #include "private/android_filesystem_config.h"
30 // This program takes a list of files and directories (indicated by a
31 // trailing slash) on the stdin, and prints to stdout each input
32 // filename along with its desired uid, gid, and mode (in octal).
33 // The leading slash should be stripped from the input.
35 // After the first 4 columns, optional key=value pairs are emitted
36 // for each file. Currently, the following keys are supported:
37 // * -S: selabel=[selinux_label]
38 // * -C: capabilities=[hex capabilities value]
42 // system/etc/dbus.conf
47 // system/etc/dbus.conf 1002 1002 440
48 // data/app 1000 1000 771
50 // or if, for example, -S is used:
52 // system/etc/dbus.conf 1002 1002 440 selabel=u:object_r:system_file:s0
53 // data/app 1000 1000 771 selabel=u:object_r:apk_data_file:s0
55 // Note that the output will omit the trailing slash from
58 static struct selabel_handle* get_sehnd(const char* context_file) {
59 struct selinux_opt seopts[] = { { SELABEL_OPT_PATH, context_file } };
60 struct selabel_handle* sehnd = selabel_open(SELABEL_CTX_FILE, seopts, 1);
63 perror("error running selabel_open");
70 fprintf(stderr, "Usage: fs_config [-D product_out_path] [-S context_file] [-C]\n");
73 int main(int argc, char** argv) {
75 const char* context_file = NULL;
76 const char* product_out_path = NULL;
77 struct selabel_handle* sehnd = NULL;
78 int print_capabilities = 0;
80 while((opt = getopt(argc, argv, "CS:D:")) != -1) {
83 print_capabilities = 1;
86 context_file = optarg;
89 product_out_path = optarg;
97 if (context_file != NULL) {
98 sehnd = get_sehnd(context_file);
101 while (fgets(buffer, 1023, stdin) != NULL) {
104 for (i = 0; i < 1024 && buffer[i]; ++i) {
107 buffer[i-is_dir] = '\0';
119 unsigned uid = 0, gid = 0, mode = 0;
120 uint64_t capabilities;
121 fs_config(buffer, is_dir, product_out_path, &uid, &gid, &mode, &capabilities);
122 printf("%s %d %d %o", buffer, uid, gid, mode);
125 size_t buffer_strlen = strnlen(buffer, sizeof(buffer));
126 if (buffer_strlen >= sizeof(buffer)) {
127 fprintf(stderr, "non null terminated buffer, aborting\n");
130 size_t full_name_size = buffer_strlen + 2;
131 char* full_name = (char*) malloc(full_name_size);
132 if (full_name == NULL) {
138 strncpy(full_name + 1, buffer, full_name_size - 1);
139 full_name[full_name_size - 1] = '\0';
142 if (selabel_lookup(sehnd, &secontext, full_name, ( mode | (is_dir ? S_IFDIR : S_IFREG)))) {
143 secontext = strdup("u:object_r:unlabeled:s0");
146 printf(" selabel=%s", secontext);
151 if (print_capabilities) {
152 printf(" capabilities=0x%" PRIx64, capabilities);