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/* 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"
" -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:vrGhHnpL")) != -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 '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;
minijail_run(j, argv[0], argv);
return minijail_wait(j);
}
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