| /* |
| * Copyright (C) 2008 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. |
| */ |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <sys/stat.h> |
| #include <errno.h> |
| #include <unistd.h> |
| #include <string.h> |
| #include <inttypes.h> |
| |
| #include <selinux/selinux.h> |
| #include <selinux/label.h> |
| |
| #include "private/android_filesystem_config.h" |
| |
| // This program takes a list of files and directories (indicated by a |
| // trailing slash) on the stdin, and prints to stdout each input |
| // filename along with its desired uid, gid, and mode (in octal). |
| // The leading slash should be stripped from the input. |
| // |
| // After the first 4 columns, optional key=value pairs are emitted |
| // for each file. Currently, the following keys are supported: |
| // * -S: selabel=[selinux_label] |
| // * -C: capabilities=[hex capabilities value] |
| // |
| // Example input: |
| // |
| // system/etc/dbus.conf |
| // data/app/ |
| // |
| // Output: |
| // |
| // system/etc/dbus.conf 1002 1002 440 |
| // data/app 1000 1000 771 |
| // |
| // or if, for example, -S is used: |
| // |
| // system/etc/dbus.conf 1002 1002 440 selabel=u:object_r:system_file:s0 |
| // data/app 1000 1000 771 selabel=u:object_r:apk_data_file:s0 |
| // |
| // Note that the output will omit the trailing slash from |
| // directories. |
| |
| static struct selabel_handle* get_sehnd(const char* context_file) { |
| struct selinux_opt seopts[] = { { SELABEL_OPT_PATH, context_file } }; |
| struct selabel_handle* sehnd = selabel_open(SELABEL_CTX_FILE, seopts, 1); |
| |
| if (!sehnd) { |
| perror("error running selabel_open"); |
| exit(EXIT_FAILURE); |
| } |
| return sehnd; |
| } |
| |
| static void usage() { |
| fprintf(stderr, "Usage: fs_config [-D product_out_path] [-S context_file] [-R root] [-C]\n"); |
| } |
| |
| int main(int argc, char** argv) { |
| char buffer[1024]; |
| const char* context_file = NULL; |
| const char* product_out_path = NULL; |
| char* root_path = NULL; |
| struct selabel_handle* sehnd = NULL; |
| int print_capabilities = 0; |
| int opt; |
| while((opt = getopt(argc, argv, "CS:R:D:")) != -1) { |
| switch(opt) { |
| case 'C': |
| print_capabilities = 1; |
| break; |
| case 'S': |
| context_file = optarg; |
| break; |
| case 'R': |
| root_path = optarg; |
| break; |
| case 'D': |
| product_out_path = optarg; |
| break; |
| default: |
| usage(); |
| exit(EXIT_FAILURE); |
| } |
| } |
| |
| if (context_file != NULL) { |
| sehnd = get_sehnd(context_file); |
| } |
| |
| if (root_path != NULL) { |
| size_t root_len = strlen(root_path); |
| /* Trim any trailing slashes from the root path. */ |
| while (root_len && root_path[--root_len] == '/') { |
| root_path[root_len] = '\0'; |
| } |
| } |
| |
| while (fgets(buffer, 1023, stdin) != NULL) { |
| int is_dir = 0; |
| int i; |
| for (i = 0; i < 1024 && buffer[i]; ++i) { |
| switch (buffer[i]) { |
| case '\n': |
| buffer[i-is_dir] = '\0'; |
| if (i == 0) { |
| is_dir = 1; // empty line is considered as root directory |
| } |
| i = 1025; |
| break; |
| case '/': |
| is_dir = 1; |
| break; |
| default: |
| is_dir = 0; |
| break; |
| } |
| } |
| |
| unsigned uid = 0, gid = 0, mode = 0; |
| uint64_t capabilities; |
| fs_config(buffer, is_dir, product_out_path, &uid, &gid, &mode, &capabilities); |
| if (root_path != NULL && strcmp(buffer, root_path) == 0) { |
| /* The root of the filesystem needs to be an empty string. */ |
| strcpy(buffer, ""); |
| } |
| printf("%s %d %d %o", buffer, uid, gid, mode); |
| |
| if (sehnd != NULL) { |
| size_t buffer_strlen = strnlen(buffer, sizeof(buffer)); |
| if (buffer_strlen >= sizeof(buffer)) { |
| fprintf(stderr, "non null terminated buffer, aborting\n"); |
| exit(EXIT_FAILURE); |
| } |
| size_t full_name_size = buffer_strlen + 2; |
| char* full_name = (char*) malloc(full_name_size); |
| if (full_name == NULL) { |
| perror("malloc"); |
| exit(EXIT_FAILURE); |
| } |
| |
| full_name[0] = '/'; |
| strncpy(full_name + 1, buffer, full_name_size - 1); |
| full_name[full_name_size - 1] = '\0'; |
| |
| char* secontext; |
| if (selabel_lookup(sehnd, &secontext, full_name, ( mode | (is_dir ? S_IFDIR : S_IFREG)))) { |
| secontext = strdup("u:object_r:unlabeled:s0"); |
| } |
| |
| printf(" selabel=%s", secontext); |
| free(full_name); |
| freecon(secontext); |
| } |
| |
| if (print_capabilities) { |
| printf(" capabilities=0x%" PRIx64, capabilities); |
| } |
| |
| printf("\n"); |
| } |
| return 0; |
| } |