| /* Copyright (c) 2012 The Chromium OS Authors. All rights reserved. |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <unistd.h> |
| |
| #include "libminijail.h" |
| #include "libsyscalls.h" |
| |
| #include "util.h" |
| |
| static void set_user(struct minijail *j, const char *arg) |
| { |
| char *end = NULL; |
| int uid = strtod(arg, &end); |
| if (!*end && *arg) { |
| minijail_change_uid(j, uid); |
| return; |
| } |
| |
| if (minijail_change_user(j, arg)) { |
| fprintf(stderr, "Bad user: '%s'\n", arg); |
| exit(1); |
| } |
| } |
| |
| static void set_group(struct minijail *j, const char *arg) |
| { |
| char *end = NULL; |
| int gid = strtod(arg, &end); |
| if (!*end && *arg) { |
| minijail_change_gid(j, gid); |
| return; |
| } |
| |
| if (minijail_change_group(j, arg)) { |
| fprintf(stderr, "Bad group: '%s'\n", arg); |
| exit(1); |
| } |
| } |
| |
| static void use_caps(struct minijail *j, const char *arg) |
| { |
| uint64_t caps; |
| char *end = NULL; |
| caps = strtoull(arg, &end, 16); |
| if (*end) { |
| fprintf(stderr, "Invalid cap set: '%s'\n", arg); |
| exit(1); |
| } |
| minijail_use_caps(j, caps); |
| } |
| |
| static void add_binding(struct minijail *j, char *arg) { |
| char *src = strtok(arg, ","); |
| char *dest = strtok(NULL, ","); |
| char *flags = strtok(NULL, ","); |
| if (!src || !dest) { |
| fprintf(stderr, "Bad binding: %s %s\n", src, dest); |
| exit(1); |
| } |
| if (minijail_bind(j, src, dest, flags ? atoi(flags) : 0)) { |
| fprintf(stderr, "Bind failure\n"); |
| exit(1); |
| } |
| } |
| |
| static void usage(const char *progn) |
| { |
| size_t i; |
| |
| printf("Usage: %s [-Ghnprsv] [-b <src>,<dest>[,<writeable>]] " |
| "[-c <caps>] [-C <dir>] [-g <group>] [-S <file>] [-u <user>] " |
| "<program> [args...]\n" |
| " -b: binds <src> to <dest> in chroot. Multiple " |
| "instances allowed\n" |
| " -c <caps>: restrict caps to <caps>\n" |
| " -C <dir>: chroot to <dir>\n" |
| " -e enter a network namespace\n" |
| " -G: inherit secondary groups from uid\n" |
| " -g <group>: change gid to <group>\n" |
| " -h: help (this message)\n" |
| " -H: seccomp filter help message\n" |
| " -L: log blocked syscalls when using seccomp filter. " |
| "Forces the following syscalls to be allowed:\n" |
| " ", progn); |
| for (i = 0; i < log_syscalls_len; i++) |
| printf("%s ", log_syscalls[i]); |
| |
| printf("\n" |
| " -n: set no_new_privs\n" |
| " -p: use pid namespace (implies -vr)\n" |
| " -r: remount /proc readonly (implies -v)\n" |
| " -s: use seccomp\n" |
| " -S <file>: set seccomp filter using <file>\n" |
| " E.g., -S /usr/share/filters/<prog>.$(uname -m)\n" |
| " -u <user>: change uid to <user>\n" |
| " -v: use vfs namespace\n"); |
| } |
| |
| static void seccomp_filter_usage(const char *progn) |
| { |
| const struct syscall_entry *entry = syscall_table; |
| printf("Usage: %s -S <policy.file> <program> [args...]\n\n" |
| "System call names supported:\n", progn); |
| for (; entry->name && entry->nr >= 0; ++entry) |
| printf(" %s [%d]\n", entry->name, entry->nr); |
| printf("\nSee minijail0(5) for example policies.\n"); |
| } |
| |
| static int parse_args(struct minijail *j, int argc, char *argv[]) |
| { |
| int opt; |
| if (argc > 1 && argv[1][0] != '-') |
| return 1; |
| while ((opt = getopt(argc, argv, "u:g:sS:c:C:b:vrGhHnpLe")) != -1) { |
| switch (opt) { |
| case 'u': |
| set_user(j, optarg); |
| break; |
| case 'g': |
| set_group(j, optarg); |
| break; |
| case 'n': |
| minijail_no_new_privs(j); |
| break; |
| case 's': |
| minijail_use_seccomp(j); |
| break; |
| case 'S': |
| minijail_parse_seccomp_filters(j, optarg); |
| minijail_use_seccomp_filter(j); |
| break; |
| case 'L': |
| minijail_log_seccomp_filter_failures(j); |
| break; |
| case 'b': |
| add_binding(j, optarg); |
| break; |
| case 'c': |
| use_caps(j, optarg); |
| break; |
| case 'C': |
| minijail_enter_chroot(j, optarg); |
| break; |
| case 'v': |
| minijail_namespace_vfs(j); |
| break; |
| case 'r': |
| minijail_remount_readonly(j); |
| break; |
| case 'G': |
| minijail_inherit_usergroups(j); |
| break; |
| case 'p': |
| minijail_namespace_pids(j); |
| break; |
| case 'e': |
| minijail_namespace_net(j); |
| break; |
| case 'H': |
| seccomp_filter_usage(argv[0]); |
| exit(1); |
| default: |
| usage(argv[0]); |
| exit(1); |
| } |
| if (optind < argc && argv[optind][0] != '-') |
| return optind; |
| } |
| |
| if (argc == optind) { |
| usage(argv[0]); |
| exit(1); |
| } |
| return optind; |
| } |
| |
| int main(int argc, char *argv[]) |
| { |
| struct minijail *j = minijail_new(); |
| int consumed = parse_args(j, argc, argv); |
| argc -= consumed; |
| argv += consumed; |
| if (access(argv[0], X_OK)) { |
| fprintf(stderr, "Target program '%s' not accessible\n", |
| argv[0]); |
| return 1; |
| } |
| minijail_run(j, argv[0], argv); |
| return minijail_wait(j); |
| } |