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|
/*
* Copyright (C) 2014-2019 Firejail Authors
*
* This file is part of firejail project
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "firejail.h"
#include "../include/pid.h"
#include "../include/firejail_user.h"
#define _GNU_SOURCE
#include <sys/utsname.h>
#include <sched.h>
#include <sys/mount.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <dirent.h>
#include <pwd.h>
#include <errno.h>
#include <limits.h>
#include <sys/file.h>
#include <sys/prctl.h>
#include <signal.h>
#include <time.h>
#include <net/if.h>
#include <sys/utsname.h>
#include <fcntl.h>
#ifndef O_PATH
#define O_PATH 010000000
#endif
#ifdef __ia64__
/* clone(2) has a different interface on ia64, as it needs to know
the size of the stack */
int __clone2(int (*fn)(void *),
void *child_stack_base, size_t stack_size,
int flags, void *arg, ...
/* pid_t *ptid, struct user_desc *tls, pid_t *ctid */ );
#endif
uid_t firejail_uid = 0;
gid_t firejail_gid = 0;
#define STACK_SIZE (1024 * 1024)
static char child_stack[STACK_SIZE]; // space for child's stack
Config cfg; // configuration
int arg_private = 0; // mount private /home and /tmp directoryu
int arg_private_cache = 0; // mount private home/.cache
int arg_debug = 0; // print debug messages
int arg_debug_blacklists = 0; // print debug messages for blacklists
int arg_debug_whitelists = 0; // print debug messages for whitelists
int arg_debug_private_lib = 0; // print debug messages for private-lib
int arg_nonetwork = 0; // --net=none
int arg_command = 0; // -c
int arg_overlay = 0; // overlay option
int arg_overlay_keep = 0; // place overlay diff in a known directory
int arg_overlay_reuse = 0; // allow the reuse of overlays
int arg_seccomp = 0; // enable default seccomp filter
int arg_seccomp_postexec = 0; // need postexec ld.preload library?
int arg_seccomp_block_secondary = 0; // block any secondary architectures
int arg_caps_default_filter = 0; // enable default capabilities filter
int arg_caps_drop = 0; // drop list
int arg_caps_drop_all = 0; // drop all capabilities
int arg_caps_keep = 0; // keep list
char *arg_caps_list = NULL; // optional caps list
int arg_trace = 0; // syscall tracing support
char *arg_tracefile = NULL; // syscall tracing file
int arg_tracelog = 0; // blacklist tracing support
int arg_rlimit_cpu = 0; // rlimit max cpu time
int arg_rlimit_nofile = 0; // rlimit nofile
int arg_rlimit_nproc = 0; // rlimit nproc
int arg_rlimit_fsize = 0; // rlimit fsize
int arg_rlimit_sigpending = 0; // rlimit fsize
int arg_rlimit_as = 0; // rlimit as
int arg_nogroups = 0; // disable supplementary groups
int arg_nonewprivs = 0; // set the NO_NEW_PRIVS prctl
int arg_noroot = 0; // create a new user namespace and disable root user
int arg_netfilter; // enable netfilter
int arg_netfilter6; // enable netfilter6
char *arg_netfilter_file = NULL; // netfilter file
char *arg_netfilter6_file = NULL; // netfilter6 file
char *arg_netns = NULL; // "ip netns"-created network namespace to use
int arg_doubledash = 0; // double dash
int arg_shell_none = 0; // run the program directly without a shell
int arg_private_dev = 0; // private dev directory
int arg_keep_dev_shm = 0; // preserve /dev/shm
int arg_private_etc = 0; // private etc directory
int arg_private_opt = 0; // private opt directory
int arg_private_srv = 0; // private srv directory
int arg_private_bin = 0; // private bin directory
int arg_private_tmp = 0; // private tmp directory
int arg_private_lib = 0; // private lib directory
int arg_private_cwd = 0; // private working directory
int arg_scan = 0; // arp-scan all interfaces
int arg_whitelist = 0; // whitelist command
int arg_nosound = 0; // disable sound
int arg_noautopulse = 0; // disable automatic ~/.config/pulse init
int arg_novideo = 0; //disable video devices in /dev
int arg_no3d; // disable 3d hardware acceleration
int arg_quiet = 0; // no output for scripting
int arg_join_network = 0; // join only the network namespace
int arg_join_filesystem = 0; // join only the mount namespace
int arg_nice = 0; // nice value configured
int arg_ipc = 0; // enable ipc namespace
int arg_writable_etc = 0; // writable etc
int arg_writable_var = 0; // writable var
int arg_keep_var_tmp = 0; // don't overwrite /var/tmp
int arg_writable_run_user = 0; // writable /run/user
int arg_writable_var_log = 0; // writable /var/log
int arg_appimage = 0; // appimage
int arg_audit = 0; // audit
char *arg_audit_prog = NULL; // audit
int arg_apparmor = 0; // apparmor
int arg_allow_debuggers = 0; // allow debuggers
int arg_x11_block = 0; // block X11
int arg_x11_xorg = 0; // use X11 security extension
int arg_allusers = 0; // all user home directories visible
int arg_machineid = 0; // preserve /etc/machine-id
int arg_allow_private_blacklist = 0; // blacklist things in private directories
int arg_disable_mnt = 0; // disable /mnt and /media
int arg_noprofile = 0; // use default.profile if none other found/specified
int arg_memory_deny_write_execute = 0; // block writable and executable memory
int arg_notv = 0; // --notv
int arg_nodvd = 0; // --nodvd
int arg_nodbus = 0; // -nodbus
int arg_nou2f = 0; // --nou2f
int arg_deterministic_exit_code = 0; // always exit with first child's exit status
int login_shell = 0;
int parent_to_child_fds[2];
int child_to_parent_fds[2];
char *fullargv[MAX_ARGS]; // expanded argv for restricted shell
int fullargc = 0;
static pid_t child = 0;
pid_t sandbox_pid;
mode_t orig_umask = 022;
unsigned long long start_timestamp;
static void clear_atexit(void) {
EUID_ROOT();
delete_run_files(getpid());
}
static void myexit(int rv) {
logmsg("exiting...");
if (!arg_command)
fmessage("\nParent is shutting down, bye...\n");
// delete sandbox files in shared memory
EUID_ROOT();
delete_run_files(sandbox_pid);
appimage_clear();
flush_stdin();
exit(rv);
}
static void my_handler(int s) {
fmessage("\nParent received signal %d, shutting down the child process...\n", s);
logsignal(s);
if (waitpid(child, NULL, WNOHANG) == 0) {
if (has_handler(child, s)) // signals are not delivered if there is no handler yet
kill(child, s);
else
kill(child, SIGKILL);
waitpid(child, NULL, 0);
}
myexit(s);
}
static void install_handler(void) {
struct sigaction sga;
// block SIGTERM while handling SIGINT
sigemptyset(&sga.sa_mask);
sigaddset(&sga.sa_mask, SIGTERM);
sga.sa_handler = my_handler;
sga.sa_flags = 0;
sigaction(SIGINT, &sga, NULL);
// block SIGINT while handling SIGTERM
sigemptyset(&sga.sa_mask);
sigaddset(&sga.sa_mask, SIGINT);
sga.sa_handler = my_handler;
sga.sa_flags = 0;
sigaction(SIGTERM, &sga, NULL);
}
// return 1 if error, 0 if a valid pid was found
static int extract_pid(const char *name, pid_t *pid) {
int retval = 0;
EUID_ASSERT();
if (!name || strlen(name) == 0) {
fprintf(stderr, "Error: invalid sandbox name\n");
exit(1);
}
EUID_ROOT();
if (name2pid(name, pid)) {
retval = 1;
}
EUID_USER();
return retval;
}
// return 1 if error, 0 if a valid pid was found
static int read_pid(const char *name, pid_t *pid) {
char *endptr;
errno = 0;
long int pidtmp = strtol(name, &endptr, 10);
if ((errno == ERANGE && (pidtmp == LONG_MAX || pidtmp == LONG_MIN))
|| (errno != 0 && pidtmp == 0)) {
return extract_pid(name,pid);
}
// endptr points to '\0' char in name if the entire string is valid
if (endptr == NULL || endptr[0]!='\0') {
return extract_pid(name,pid);
}
*pid =(pid_t)pidtmp;
return 0;
}
static pid_t require_pid(const char *name) {
pid_t pid;
if (read_pid(name,&pid)) {
fprintf(stderr, "Error: cannot find sandbox %s\n", name);
exit(1);
}
return pid;
}
// return 1 if there is a link somewhere in path of directory
static int has_link(const char *dir) {
assert(dir);
int fd = safe_fd(dir, O_PATH|O_DIRECTORY|O_NOFOLLOW|O_CLOEXEC);
if (fd == -1) {
if (errno == ENOTDIR && is_dir(dir))
return 1;
}
else
close(fd);
return 0;
}
static void check_homedir(void) {
assert(cfg.homedir);
if (cfg.homedir[0] != '/' || cfg.homedir[1] == '\0') { // system users sometimes have root directory as home
fprintf(stderr, "Error: invalid user directory \"%s\"\n", cfg.homedir);
exit(1);
}
// symlinks are rejected in many places
if (has_link(cfg.homedir)) {
fprintf(stderr, "No full support for symbolic links in path of user directory.\n"
"Please provide resolved path in password database (/etc/passwd).\n\n");
}
}
// init configuration
static void init_cfg(int argc, char **argv) {
EUID_ASSERT();
memset(&cfg, 0, sizeof(cfg));
cfg.original_argv = argv;
cfg.original_argc = argc;
cfg.bridge0.devsandbox = "eth0";
cfg.bridge1.devsandbox = "eth1";
cfg.bridge2.devsandbox = "eth2";
cfg.bridge3.devsandbox = "eth3";
// extract user data
EUID_ROOT(); // rise permissions for grsecurity
struct passwd *pw = getpwuid(getuid());
if (!pw)
errExit("getpwuid");
EUID_USER();
cfg.username = strdup(pw->pw_name);
if (!cfg.username)
errExit("strdup");
// check user database
if (!firejail_user_check(cfg.username)) {
fprintf(stderr, "Error: the user is not allowed to use Firejail.\n"
"Please add the user in %s/firejail.users file,\n"
"either by running \"sudo firecfg\", or by editing the file directly.\n"
"See \"man firejail-users\" for more details.\n\n", SYSCONFDIR);
// attempt to run the program as is
run_symlink(argc, argv, 1);
exit(1);
}
cfg.cwd = getcwd(NULL, 0);
if (!cfg.cwd && errno != ENOENT)
errExit("getcwd");
// build home directory name
if (pw->pw_dir == NULL) {
fprintf(stderr, "Error: user %s doesn't have a user directory assigned\n", cfg.username);
exit(1);
}
cfg.homedir = clean_pathname(pw->pw_dir);
check_homedir();
// initialize random number generator
sandbox_pid = getpid();
time_t t = time(NULL);
srand(t ^ sandbox_pid);
}
static void check_network(Bridge *br) {
assert(br);
if (br->macvlan == 0) // for bridge devices check network range or arp-scan and assign address
net_configure_sandbox_ip(br);
else if (br->ipsandbox) { // for macvlan check network range
char *rv = in_netrange(br->ipsandbox, br->ip, br->mask);
if (rv) {
fprintf(stderr, "%s", rv);
exit(1);
}
}
}
#ifdef HAVE_USERNS
void check_user_namespace(void) {
EUID_ASSERT();
if (getuid() == 0)
goto errout;
// test user namespaces available in the kernel
struct stat s1;
struct stat s2;
struct stat s3;
if (stat("/proc/self/ns/user", &s1) == 0 &&
stat("/proc/self/uid_map", &s2) == 0 &&
stat("/proc/self/gid_map", &s3) == 0)
arg_noroot = 1;
else
goto errout;
return;
errout:
fwarning("noroot option is not available\n");
arg_noroot = 0;
}
#endif
static void exit_err_feature(const char *feature) {
fprintf(stderr, "Error: %s feature is disabled in Firejail configuration file\n", feature);
exit(1);
}
// run independent commands and exit program
// this function handles command line options such as --version and --help
static void run_cmd_and_exit(int i, int argc, char **argv) {
EUID_ASSERT();
//*************************************
// basic arguments
//*************************************
if (strcmp(argv[i], "--help") == 0 ||
strcmp(argv[i], "-?") == 0) {
usage();
exit(0);
}
else if (strcmp(argv[i], "--version") == 0) {
printf("firejail version %s\n", VERSION);
printf("\n");
print_compiletime_support();
printf("\n");
exit(0);
}
#ifdef HAVE_OVERLAYFS
else if (strcmp(argv[i], "--overlay-clean") == 0) {
if (checkcfg(CFG_OVERLAYFS)) {
if (remove_overlay_directory()) {
fprintf(stderr, "Error: cannot remove overlay directory\n");
exit(1);
}
}
else
exit_err_feature("overlayfs");
exit(0);
}
#endif
#ifdef HAVE_X11
else if (strcmp(argv[i], "--x11") == 0) {
if (checkcfg(CFG_X11)) {
x11_start(argc, argv);
exit(0);
}
else
exit_err_feature("x11");
}
else if (strcmp(argv[i], "--x11=xpra") == 0) {
if (checkcfg(CFG_X11)) {
x11_start_xpra(argc, argv);
exit(0);
}
else
exit_err_feature("x11");
}
else if (strcmp(argv[i], "--x11=xephyr") == 0) {
if (checkcfg(CFG_X11)) {
x11_start_xephyr(argc, argv);
exit(0);
}
else
exit_err_feature("x11");
}
else if (strcmp(argv[i], "--x11=xvfb") == 0) {
if (checkcfg(CFG_X11)) {
x11_start_xvfb(argc, argv);
exit(0);
}
else
exit_err_feature("x11");
}
#endif
#ifdef HAVE_NETWORK
else if (strncmp(argv[i], "--bandwidth=", 12) == 0) {
if (checkcfg(CFG_NETWORK)) {
logargs(argc, argv);
// extract the command
if ((i + 1) == argc) {
fprintf(stderr, "Error: command expected after --bandwidth option\n");
exit(1);
}
char *cmd = argv[i + 1];
if (strcmp(cmd, "status") && strcmp(cmd, "clear") && strcmp(cmd, "set")) {
fprintf(stderr, "Error: invalid --bandwidth command.\nValid commands: set, clear, status.\n");
exit(1);
}
// extract network name
char *dev = NULL;
int down = 0;
int up = 0;
if (strcmp(cmd, "set") == 0 || strcmp(cmd, "clear") == 0) {
// extract device name
if ((i + 2) == argc) {
fprintf(stderr, "Error: network name expected after --bandwidth %s option\n", cmd);
exit(1);
}
dev = argv[i + 2];
// check device name
if (if_nametoindex(dev) == 0) {
fprintf(stderr, "Error: network device %s not found\n", dev);
exit(1);
}
// extract bandwidth
if (strcmp(cmd, "set") == 0) {
if ((i + 4) >= argc) {
fprintf(stderr, "Error: invalid --bandwidth set command\n");
exit(1);
}
down = atoi(argv[i + 3]);
if (down < 0) {
fprintf(stderr, "Error: invalid download speed\n");
exit(1);
}
up = atoi(argv[i + 4]);
if (up < 0) {
fprintf(stderr, "Error: invalid upload speed\n");
exit(1);
}
}
}
// extract pid or sandbox name
pid_t pid = require_pid(argv[i] + 12);
bandwidth_pid(pid, cmd, dev, down, up);
}
else
exit_err_feature("networking");
exit(0);
}
else if (strncmp(argv[i], "--netfilter.print=", 18) == 0) {
// extract pid or sandbox name
pid_t pid = require_pid(argv[i] + 18);
netfilter_print(pid, 0);
exit(0);
}
else if (strncmp(argv[i], "--netfilter6.print=", 19) == 0) {
// extract pid or sandbox name
pid_t pid = require_pid(argv[i] + 19);
netfilter_print(pid, 1);
exit(0);
}
#endif
//*************************************
// independent commands - the program will exit!
//*************************************
#ifdef HAVE_SECCOMP
else if (strcmp(argv[i], "--debug-syscalls") == 0) {
if (checkcfg(CFG_SECCOMP)) {
int rv = sbox_run(SBOX_USER | SBOX_CAPS_NONE | SBOX_SECCOMP, 2, PATH_FSECCOMP_MAIN, "debug-syscalls");
exit(rv);
}
else
exit_err_feature("seccomp");
}
else if (strcmp(argv[i], "--debug-errnos") == 0) {
if (checkcfg(CFG_SECCOMP)) {
int rv = sbox_run(SBOX_USER | SBOX_CAPS_NONE | SBOX_SECCOMP, 2, PATH_FSECCOMP_MAIN, "debug-errnos");
exit(rv);
}
else
exit_err_feature("seccomp");
exit(0);
}
else if (strncmp(argv[i], "--seccomp.print=", 16) == 0) {
if (checkcfg(CFG_SECCOMP)) {
// print seccomp filter for a sandbox specified by pid or by name
pid_t pid = require_pid(argv[i] + 16);
seccomp_print_filter(pid);
}
else
exit_err_feature("seccomp");
exit(0);
}
else if (strcmp(argv[i], "--debug-protocols") == 0) {
int rv = sbox_run(SBOX_USER | SBOX_CAPS_NONE | SBOX_SECCOMP, 2, PATH_FSECCOMP_MAIN, "debug-protocols");
exit(rv);
}
else if (strncmp(argv[i], "--protocol.print=", 17) == 0) {
if (checkcfg(CFG_SECCOMP)) {
// print seccomp filter for a sandbox specified by pid or by name
pid_t pid = require_pid(argv[i] + 17);
protocol_print_filter(pid);
}
else
exit_err_feature("seccomp");
exit(0);
}
#endif
else if (strncmp(argv[i], "--profile.print=", 16) == 0) {
pid_t pid = require_pid(argv[i] + 16);
// print /run/firejail/profile/<PID> file
char *fname;
if (asprintf(&fname, RUN_FIREJAIL_PROFILE_DIR "/%d", pid) == -1)
errExit("asprintf");
FILE *fp = fopen(fname, "r");
if (!fp) {
fprintf(stderr, "Error: sandbox %s not found\n", argv[i] + 16);
exit(1);
}
#define MAXBUF 4096
char buf[MAXBUF];
if (fgets(buf, MAXBUF, fp))
printf("%s", buf);
fclose(fp);
exit(0);
}
else if (strncmp(argv[i], "--cpu.print=", 12) == 0) {
// join sandbox by pid or by name
pid_t pid = require_pid(argv[i] + 12);
cpu_print_filter(pid);
exit(0);
}
else if (strncmp(argv[i], "--apparmor.print=", 17) == 0) {
// join sandbox by pid or by name
pid_t pid = require_pid(argv[i] + 17);
char *pidstr;
if (asprintf(&pidstr, "%u", pid) == -1)
errExit("asprintf");
sbox_run(SBOX_USER| SBOX_CAPS_NONE | SBOX_SECCOMP, 3, PATH_FIREMON, "--apparmor", pidstr);
free(pidstr);
exit(0);
}
else if (strncmp(argv[i], "--caps.print=", 13) == 0) {
// join sandbox by pid or by name
pid_t pid = require_pid(argv[i] + 13);
caps_print_filter(pid);
exit(0);
}
else if (strncmp(argv[i], "--fs.print=", 11) == 0) {
// join sandbox by pid or by name
pid_t pid = require_pid(argv[i] + 11);
fs_logger_print_log(pid);
exit(0);
}
else if (strncmp(argv[i], "--dns.print=", 12) == 0) {
// join sandbox by pid or by name
pid_t pid = require_pid(argv[i] + 12);
net_dns_print(pid);
exit(0);
}
else if (strcmp(argv[i], "--debug-caps") == 0) {
caps_print();
exit(0);
}
else if (strcmp(argv[i], "--list") == 0) {
if (pid_hidepid())
sbox_run(SBOX_ROOT| SBOX_CAPS_HIDEPID | SBOX_SECCOMP, 2, PATH_FIREMON, "--list");
else
sbox_run(SBOX_USER| SBOX_CAPS_NONE | SBOX_SECCOMP, 2, PATH_FIREMON, "--list");
exit(0);
}
else if (strcmp(argv[i], "--tree") == 0) {
if (pid_hidepid())
sbox_run(SBOX_ROOT | SBOX_CAPS_HIDEPID | SBOX_SECCOMP, 2, PATH_FIREMON, "--tree");
else
sbox_run(SBOX_USER | SBOX_CAPS_NONE | SBOX_SECCOMP, 2, PATH_FIREMON, "--tree");
exit(0);
}
else if (strcmp(argv[i], "--top") == 0) {
if (pid_hidepid())
sbox_run(SBOX_ROOT | SBOX_CAPS_HIDEPID | SBOX_SECCOMP | SBOX_ALLOW_STDIN,
2, PATH_FIREMON, "--top");
else
sbox_run(SBOX_USER | SBOX_CAPS_NONE | SBOX_SECCOMP | SBOX_ALLOW_STDIN,
2, PATH_FIREMON, "--top");
exit(0);
}
#ifdef HAVE_NETWORK
else if (strcmp(argv[i], "--netstats") == 0) {
if (checkcfg(CFG_NETWORK)) {
struct stat s;
if (stat("/proc/sys/kernel/grsecurity", &s) == 0 || pid_hidepid())
sbox_run(SBOX_ROOT | SBOX_CAPS_HIDEPID | SBOX_SECCOMP | SBOX_ALLOW_STDIN,
2, PATH_FIREMON, "--netstats");
else
sbox_run(SBOX_USER | SBOX_CAPS_NONE | SBOX_SECCOMP | SBOX_ALLOW_STDIN,
2, PATH_FIREMON, "--netstats");
exit(0);
}
else
exit_err_feature("networking");
}
else if (strncmp(argv[i], "--net.print=", 12) == 0) {
if (checkcfg(CFG_NETWORK)) {
// extract pid or sandbox name
pid_t pid = require_pid(argv[i] + 12);
net_print(pid);
exit(0);
}
else
exit_err_feature("networking");
}
#endif
#ifdef HAVE_FILE_TRANSFER
else if (strncmp(argv[i], "--get=", 6) == 0) {
if (checkcfg(CFG_FILE_TRANSFER)) {
logargs(argc, argv);
if (arg_private_cwd) {
fprintf(stderr, "Error: --get and --private-cwd options are mutually exclusive\n");
exit(1);
}
// verify path
if ((i + 2) != argc) {
fprintf(stderr, "Error: invalid --get option, path expected\n");
exit(1);
}
char *path = argv[i + 1];
invalid_filename(path, 0); // no globbing
if (strstr(path, "..")) {
fprintf(stderr, "Error: invalid file name %s\n", path);
exit(1);
}
// get file
pid_t pid = require_pid(argv[i] + 6);
sandboxfs(SANDBOX_FS_GET, pid, path, NULL);
exit(0);
}
else
exit_err_feature("file transfer");
}
else if (strncmp(argv[i], "--put=", 6) == 0) {
if (checkcfg(CFG_FILE_TRANSFER)) {
logargs(argc, argv);
if (arg_private_cwd) {
fprintf(stderr, "Error: --put and --private-cwd options are mutually exclusive\n");
exit(1);
}
// verify path
if ((i + 3) != argc) {
fprintf(stderr, "Error: invalid --put option, 2 paths expected\n");
exit(1);
}
char *path1 = argv[i + 1];
invalid_filename(path1, 0); // no globbing
if (strstr(path1, "..")) {
fprintf(stderr, "Error: invalid file name %s\n", path1);
exit(1);
}
char *path2 = argv[i + 2];
invalid_filename(path2, 0); // no globbing
if (strstr(path2, "..")) {
fprintf(stderr, "Error: invalid file name %s\n", path2);
exit(1);
}
// get file
pid_t pid = require_pid(argv[i] + 6);
sandboxfs(SANDBOX_FS_PUT, pid, path1, path2);
exit(0);
}
else
exit_err_feature("file transfer");
}
else if (strncmp(argv[i], "--ls=", 5) == 0) {
if (checkcfg(CFG_FILE_TRANSFER)) {
logargs(argc, argv);
if (arg_private_cwd) {
fprintf(stderr, "Error: --ls and --private-cwd options are mutually exclusive\n");
exit(1);
}
// verify path
if ((i + 2) != argc) {
fprintf(stderr, "Error: invalid --ls option, path expected\n");
exit(1);
}
char *path = argv[i + 1];
invalid_filename(path, 0); // no globbing
if (strstr(path, "..")) {
fprintf(stderr, "Error: invalid file name %s\n", path);
exit(1);
}
// list directory contents
pid_t pid = require_pid(argv[i] + 5);
sandboxfs(SANDBOX_FS_LS, pid, path, NULL);
exit(0);
}
else
exit_err_feature("file transfer");
}
#endif
else if (strncmp(argv[i], "--join=", 7) == 0) {
if (checkcfg(CFG_JOIN) || getuid() == 0) {
logargs(argc, argv);
if (arg_shell_none) {
if (argc <= (i+1)) {
fprintf(stderr, "Error: --shell=none set, but no command specified\n");
exit(1);
}
cfg.original_program_index = i + 1;
}
if (!cfg.shell && !arg_shell_none)
cfg.shell = guess_shell();
// join sandbox by pid or by name
pid_t pid = require_pid(argv[i] + 7);
join(pid, argc, argv, i + 1);
exit(0);
}
else
exit_err_feature("join");
}
else if (strncmp(argv[i], "--join-or-start=", 16) == 0) {
// NOTE: this is first part of option handler,
// sandbox name is set in other part
if (checkcfg(CFG_JOIN) || getuid() == 0) {
logargs(argc, argv);
if (arg_shell_none) {
if (argc <= (i+1)) {
fprintf(stderr, "Error: --shell=none set, but no command specified\n");
exit(1);
}
cfg.original_program_index = i + 1;
}
// try to join by name only
pid_t pid;
if (!read_pid(argv[i] + 16, &pid)) {
if (!cfg.shell && !arg_shell_none)
cfg.shell = guess_shell();
join(pid, argc, argv, i + 1);
exit(0);
}
// if there no such sandbox continue argument processing
}
else
exit_err_feature("join");
}
#ifdef HAVE_NETWORK
else if (strncmp(argv[i], "--join-network=", 15) == 0) {
if (checkcfg(CFG_NETWORK)) {
logargs(argc, argv);
arg_join_network = 1;
if (getuid() != 0) {
fprintf(stderr, "Error: --join-network is only available to root user\n");
exit(1);
}
if (!cfg.shell && !arg_shell_none)
cfg.shell = guess_shell();
// join sandbox by pid or by name
pid_t pid = require_pid(argv[i] + 15);
join(pid, argc, argv, i + 1);
}
else
exit_err_feature("networking");
exit(0);
}
#endif
else if (strncmp(argv[i], "--join-filesystem=", 18) == 0) {
logargs(argc, argv);
arg_join_filesystem = 1;
if (getuid() != 0) {
fprintf(stderr, "Error: --join-filesystem is only available to root user\n");
exit(1);
}
if (!cfg.shell && !arg_shell_none)
cfg.shell = guess_shell();
// join sandbox by pid or by name
pid_t pid = require_pid(argv[i] + 18);
join(pid, argc, argv, i + 1);
exit(0);
}
else if (strncmp(argv[i], "--shutdown=", 11) == 0) {
logargs(argc, argv);
// shutdown sandbox by pid or by name
pid_t pid = require_pid(argv[i] + 11);
shut(pid);
exit(0);
}
}
char *guess_shell(void) {
char *shell = NULL;
struct stat s;
shell = getenv("SHELL");
if (shell) {
invalid_filename(shell, 0); // no globbing
if (!is_dir(shell) && strstr(shell, "..") == NULL && stat(shell, &s) == 0 && access(shell, X_OK) == 0)
return shell;
}
// shells in order of preference
char *shells[] = {"/bin/bash", "/bin/csh", "/usr/bin/zsh", "/bin/sh", "/bin/ash", NULL };
int i = 0;
while (shells[i] != NULL) {
// access call checks as real UID/GID, not as effective UID/GID
if (stat(shells[i], &s) == 0 && access(shells[i], X_OK) == 0) {
shell = shells[i];
break;
}
i++;
}
return shell;
}
static int check_arg(int argc, char **argv, const char *argument, int strict) {
int i;
int found = 0;
for (i = 1; i < argc; i++) {
if (strict) {
if (strcmp(argv[i], argument) == 0) {
found = 1;
break;
}
}
else {
if (strncmp(argv[i], argument, strlen(argument)) == 0) {
found = 1;
break;
}
}
// detect end of firejail params
if (strcmp(argv[i], "--") == 0)
break;
if (strncmp(argv[i], "--", 2) != 0)
break;
}
return found;
}
static void run_builder(int argc, char **argv) {
EUID_ASSERT();
(void) argc;
// drop privileges
if (setresgid(-1, getgid(), getgid()) != 0)
errExit("setresgid");
if (setresuid(-1, getuid(), getuid()) != 0)
errExit("setresuid");
assert(getenv("LD_PRELOAD") == NULL);
umask(orig_umask);
argv[0] = LIBDIR "/firejail/fbuilder";
execvp(argv[0], argv);
perror("execvp");
exit(1);
}
//*******************************************
// Main program
//*******************************************
int main(int argc, char **argv) {
int i;
int prog_index = -1; // index in argv where the program command starts
int lockfd_network = -1;
int lockfd_directory = -1;
int option_cgroup = 0;
int custom_profile = 0; // custom profile loaded
int arg_caps_cmdline = 0; // caps requested on command line (used to break out of --chroot)
// drop permissions by default and rise them when required
EUID_INIT();
EUID_USER();
// sanitize the umask
orig_umask = umask(022);
// check if the user is allowed to use firejail
init_cfg(argc, argv);
// get starting timestamp, process --quiet
start_timestamp = getticks();
char *env_quiet = getenv("FIREJAIL_QUIET");
if (check_arg(argc, argv, "--quiet", 1) || (env_quiet && strcmp(env_quiet, "yes") == 0))
arg_quiet = 1;
// cleanup at exit
EUID_ROOT();
atexit(clear_atexit);
// build /run/firejail directory structure
preproc_build_firejail_dir();
char *container_name = getenv("container");
if (!container_name || strcmp(container_name, "firejail")) {
lockfd_directory = open(RUN_DIRECTORY_LOCK_FILE, O_WRONLY | O_CREAT, S_IRUSR | S_IWUSR);
if (lockfd_directory != -1) {
int rv = fchown(lockfd_directory, 0, 0);
(void) rv;
flock(lockfd_directory, LOCK_EX);
}
preproc_clean_run();
flock(lockfd_directory, LOCK_UN);
close(lockfd_directory);
}
EUID_USER();
// process allow-debuggers
if (check_arg(argc, argv, "--allow-debuggers", 1)) {
// check kernel version
struct utsname u;
int rv = uname(&u);
if (rv != 0)
errExit("uname");
int major;
int minor;
if (2 != sscanf(u.release, "%d.%d", &major, &minor)) {
fprintf(stderr, "Error: cannot extract Linux kernel version: %s\n", u.version);
exit(1);
}
if (major < 4 || (major == 4 && minor < 8)) {
fprintf(stderr, "Error: --allow-debuggers is disabled on Linux kernels prior to 4.8. "
"A bug in ptrace call allows a full bypass of the seccomp filter. "
"Your current kernel version is %d.%d.\n", major, minor);
exit(1);
}
arg_allow_debuggers = 1;
char *cmd = strdup("noblacklist ${PATH}/strace");
if (!cmd)
errExit("strdup");
profile_add(cmd);
}
// profile builder
if (check_arg(argc, argv, "--build", 0)) // supports both --build and --build=filename
run_builder(argc, argv); // this function will not return
// check argv[0] symlink wrapper if this is not a login shell
if (*argv[0] != '-')
run_symlink(argc, argv, 0); // if symlink detected, this function will not return
// check if we already have a sandbox running
// If LXC is detected, start firejail sandbox
// otherwise try to detect a PID namespace by looking under /proc for specific kernel processes and:
// - start the application in a /bin/bash shell
if (check_namespace_virt() == 0) {
EUID_ROOT();
int rv = check_kernel_procs();
EUID_USER();
if (rv == 0) {
if (check_arg(argc, argv, "--version", 1)) {
printf("firejail version %s\n", VERSION);
exit(0);
}
// start the program directly without sandboxing
run_no_sandbox(argc, argv);
// it will never get here!
assert(0);
}
}
EUID_ASSERT();
// check firejail directories
EUID_ROOT();
delete_run_files(sandbox_pid);
EUID_USER();
//check if the parent is sshd daemon
int parent_sshd = 0;
{
pid_t ppid = getppid();
EUID_ROOT();
char *comm = pid_proc_comm(ppid);
EUID_USER();
if (comm) {
if (strcmp(comm, "sshd") == 0) {
arg_quiet = 1;
parent_sshd = 1;
#ifdef DEBUG_RESTRICTED_SHELL
{EUID_ROOT();
FILE *fp = fopen("/firelog", "w");
if (fp) {
int i;
fprintf(fp, "argc %d: ", argc);
for (i = 0; i < argc; i++)
fprintf(fp, "#%s# ", argv[i]);
fprintf(fp, "\n");
fclose(fp);
}
EUID_USER();}
#endif
// run sftp and scp directly without any sandboxing
// regular login has argv[0] == "-firejail"
if (*argv[0] != '-') {
if (strcmp(argv[1], "-c") == 0 && argc > 2) {
if (strcmp(argv[2], "/usr/lib/openssh/sftp-server") == 0 ||
strncmp(argv[2], "scp ", 4) == 0) {
#ifdef DEBUG_RESTRICTED_SHELL
{EUID_ROOT();
FILE *fp = fopen("/firelog", "a");
if (fp) {
fprintf(fp, "run without a sandbox\n");
fclose(fp);
}
EUID_USER();}
#endif
drop_privs(1);
umask(orig_umask);
int rv = system(argv[2]);
exit(rv);
}
}
}
}
free(comm);
}
}
EUID_ASSERT();
// is this a login shell, or a command passed by sshd, insert command line options from /etc/firejail/login.users
if (*argv[0] == '-' || parent_sshd) {
if (argc == 1)
login_shell = 1;
fullargc = restricted_shell(cfg.username);
if (fullargc) {
#ifdef DEBUG_RESTRICTED_SHELL
{EUID_ROOT();
FILE *fp = fopen("/firelog", "a");
if (fp) {
fprintf(fp, "fullargc %d: ", fullargc);
int i;
for (i = 0; i < fullargc; i++)
fprintf(fp, "#%s# ", fullargv[i]);
fprintf(fp, "\n");
fclose(fp);
}
EUID_USER();}
#endif
int j;
for (i = 1, j = fullargc; i < argc && j < MAX_ARGS; i++, j++, fullargc++)
fullargv[j] = argv[i];
// replace argc/argv with fullargc/fullargv
argv = fullargv;
argc = j;
#ifdef DEBUG_RESTRICTED_SHELL
{EUID_ROOT();
FILE *fp = fopen("/firelog", "a");
if (fp) {
fprintf(fp, "argc %d: ", argc);
int i;
for (i = 0; i < argc; i++)
fprintf(fp, "#%s# ", argv[i]);
fprintf(fp, "\n");
fclose(fp);
}
EUID_USER();}
#endif
}
}
else {
// check --output option and execute it;
check_output(argc, argv); // the function will not return if --output or --output-stderr option was found
}
EUID_ASSERT();
// check for force-nonewprivs in /etc/firejail/firejail.config file
if (checkcfg(CFG_FORCE_NONEWPRIVS))
arg_nonewprivs = 1;
// parse arguments
for (i = 1; i < argc; i++) {
run_cmd_and_exit(i, argc, argv); // will exit if the command is recognized
if (strcmp(argv[i], "--debug") == 0 && !arg_quiet)
arg_debug = 1;
else if (strcmp(argv[i], "--debug-blacklists") == 0)
arg_debug_blacklists = 1;
else if (strcmp(argv[i], "--debug-whitelists") == 0)
arg_debug_whitelists = 1;
else if (strcmp(argv[i], "--debug-private-lib") == 0)
arg_debug_private_lib = 1;
else if (strcmp(argv[i], "--quiet") == 0) {
arg_quiet = 1;
arg_debug = 0;
}
else if (strcmp(argv[i], "--allow-debuggers") == 0) {
// already handled
}
//*************************************
// x11
//*************************************
#ifdef HAVE_X11
else if (strncmp(argv[i], "--xephyr-screen=", 16) == 0) {
if (checkcfg(CFG_X11))
; // the processing is done directly in x11.c
else
exit_err_feature("x11");
}
#endif
//*************************************
// filtering
//*************************************
#ifdef HAVE_APPARMOR
else if (strcmp(argv[i], "--apparmor") == 0)
arg_apparmor = 1;
#endif
#ifdef HAVE_SECCOMP
else if (strncmp(argv[i], "--protocol=", 11) == 0) {
if (checkcfg(CFG_SECCOMP)) {
if (cfg.protocol) {
fwarning("two protocol lists are present, \"%s\" will be installed\n", cfg.protocol);
}
else {
// store list
cfg.protocol = strdup(argv[i] + 11);
if (!cfg.protocol)
errExit("strdup");
}
}
else
exit_err_feature("seccomp");
}
else if (strcmp(argv[i], "--seccomp") == 0) {
if (checkcfg(CFG_SECCOMP)) {
if (arg_seccomp) {
fprintf(stderr, "Error: seccomp already enabled\n");
exit(1);
}
arg_seccomp = 1;
}
else
exit_err_feature("seccomp");
}
else if (strncmp(argv[i], "--seccomp=", 10) == 0) {
if (checkcfg(CFG_SECCOMP)) {
if (arg_seccomp) {
fprintf(stderr, "Error: seccomp already enabled\n");
exit(1);
}
arg_seccomp = 1;
cfg.seccomp_list = seccomp_check_list(argv[i] + 10);
}
else
exit_err_feature("seccomp");
}
else if (strncmp(argv[i], "--seccomp.drop=", 15) == 0) {
if (checkcfg(CFG_SECCOMP)) {
if (arg_seccomp) {
fprintf(stderr, "Error: seccomp already enabled\n");
exit(1);
}
arg_seccomp = 1;
cfg.seccomp_list_drop = seccomp_check_list(argv[i] + 15);
}
else
exit_err_feature("seccomp");
}
else if (strncmp(argv[i], "--seccomp.keep=", 15) == 0) {
if (checkcfg(CFG_SECCOMP)) {
if (arg_seccomp) {
fprintf(stderr, "Error: seccomp already enabled\n");
exit(1);
}
arg_seccomp = 1;
cfg.seccomp_list_keep = seccomp_check_list(argv[i] + 15);
}
else
exit_err_feature("seccomp");
}
else if (strcmp(argv[i], "--seccomp.block-secondary") == 0) {
if (checkcfg(CFG_SECCOMP)) {
arg_seccomp_block_secondary = 1;
}
else
exit_err_feature("seccomp");
}
else if (strcmp(argv[i], "--memory-deny-write-execute") == 0) {
if (checkcfg(CFG_SECCOMP))
arg_memory_deny_write_execute = 1;
else
exit_err_feature("seccomp");
}
#endif
else if (strcmp(argv[i], "--caps") == 0) {
arg_caps_default_filter = 1;
arg_caps_cmdline = 1;
}
else if (strcmp(argv[i], "--caps.drop=all") == 0)
arg_caps_drop_all = 1;
else if (strncmp(argv[i], "--caps.drop=", 12) == 0) {
arg_caps_drop = 1;
arg_caps_list = strdup(argv[i] + 12);
if (!arg_caps_list)
errExit("strdup");
// verify caps list and exit if problems
caps_check_list(arg_caps_list, NULL);
arg_caps_cmdline = 1;
}
else if (strncmp(argv[i], "--caps.keep=", 12) == 0) {
arg_caps_keep = 1;
arg_caps_list = strdup(argv[i] + 12);
if (!arg_caps_list)
errExit("strdup");
// verify caps list and exit if problems
caps_check_list(arg_caps_list, NULL);
arg_caps_cmdline = 1;
}
else if (strcmp(argv[i], "--trace") == 0)
arg_trace = 1;
else if (strncmp(argv[i], "--trace=", 8) == 0) {
arg_trace = 1;
arg_tracefile = argv[i] + 8;
}
else if (strcmp(argv[i], "--tracelog") == 0)
arg_tracelog = 1;
else if (strncmp(argv[i], "--rlimit-cpu=", 13) == 0) {
check_unsigned(argv[i] + 13, "Error: invalid rlimit");
sscanf(argv[i] + 13, "%llu", &cfg.rlimit_cpu);
arg_rlimit_cpu = 1;
}
else if (strncmp(argv[i], "--rlimit-nofile=", 16) == 0) {
check_unsigned(argv[i] + 16, "Error: invalid rlimit");
sscanf(argv[i] + 16, "%llu", &cfg.rlimit_nofile);
arg_rlimit_nofile = 1;
}
else if (strncmp(argv[i], "--rlimit-nproc=", 15) == 0) {
check_unsigned(argv[i] + 15, "Error: invalid rlimit");
sscanf(argv[i] + 15, "%llu", &cfg.rlimit_nproc);
arg_rlimit_nproc = 1;
}
else if (strncmp(argv[i], "--rlimit-fsize=", 15) == 0) {
check_unsigned(argv[i] + 15, "Error: invalid rlimit");
sscanf(argv[i] + 15, "%llu", &cfg.rlimit_fsize);
arg_rlimit_fsize = 1;
}
else if (strncmp(argv[i], "--rlimit-sigpending=", 20) == 0) {
check_unsigned(argv[i] + 20, "Error: invalid rlimit");
sscanf(argv[i] + 20, "%llu", &cfg.rlimit_sigpending);
arg_rlimit_sigpending = 1;
}
else if (strncmp(argv[i], "--rlimit-as=", 12) == 0) {
check_unsigned(argv[i] + 12, "Error: invalid rlimit");
sscanf(argv[i] + 12, "%llu", &cfg.rlimit_as);
arg_rlimit_as = 1;
}
else if (strncmp(argv[i], "--ipc-namespace", 15) == 0)
arg_ipc = 1;
else if (strncmp(argv[i], "--cpu=", 6) == 0)
read_cpu_list(argv[i] + 6);
else if (strncmp(argv[i], "--nice=", 7) == 0) {
cfg.nice = atoi(argv[i] + 7);
if (getuid() != 0 &&cfg.nice < 0)
cfg.nice = 0;
arg_nice = 1;
}
else if (strncmp(argv[i], "--cgroup=", 9) == 0) {
if (checkcfg(CFG_CGROUP)) {
if (option_cgroup) {
fprintf(stderr, "Error: only a cgroup can be defined\n");
exit(1);
}
option_cgroup = 1;
cfg.cgroup = strdup(argv[i] + 9);
if (!cfg.cgroup)
errExit("strdup");
set_cgroup(cfg.cgroup);
}
else
exit_err_feature("cgroup");
}
//*************************************
// filesystem
//*************************************
else if (strcmp(argv[i], "--allusers") == 0)
arg_allusers = 1;
else if (strncmp(argv[i], "--bind=", 7) == 0) {
if (checkcfg(CFG_BIND)) {
char *line;
if (asprintf(&line, "bind %s", argv[i] + 7) == -1)
errExit("asprintf");
profile_check_line(line, 0, NULL); // will exit if something wrong
profile_add(line);
}
else
exit_err_feature("bind");
}
else if (strncmp(argv[i], "--tmpfs=", 8) == 0) {
char *line;
if (asprintf(&line, "tmpfs %s", argv[i] + 8) == -1)
errExit("asprintf");
profile_check_line(line, 0, NULL); // will exit if something wrong
profile_add(line);
}
else if (strncmp(argv[i], "--blacklist=", 12) == 0) {
char *line;
if (asprintf(&line, "blacklist %s", argv[i] + 12) == -1)
errExit("asprintf");
profile_check_line(line, 0, NULL); // will exit if something wrong
profile_add(line);
}
else if (strncmp(argv[i], "--noblacklist=", 14) == 0) {
char *line;
if (asprintf(&line, "noblacklist %s", argv[i] + 14) == -1)
errExit("asprintf");
profile_check_line(line, 0, NULL); // will exit if something wrong
profile_add(line);
}
#ifdef HAVE_WHITELIST
else if (strncmp(argv[i], "--whitelist=", 12) == 0) {
if (checkcfg(CFG_WHITELIST)) {
char *line;
if (asprintf(&line, "whitelist %s", argv[i] + 12) == -1)
errExit("asprintf");
profile_check_line(line, 0, NULL); // will exit if something wrong
profile_add(line);
}
else
exit_err_feature("whitelist");
}
else if (strncmp(argv[i], "--nowhitelist=", 14) == 0) {
char *line;
if (asprintf(&line, "nowhitelist %s", argv[i] + 14) == -1)
errExit("asprintf");
profile_check_line(line, 0, NULL); // will exit if something wrong
profile_add(line);
}
#endif
else if (strncmp(argv[i], "--read-only=", 12) == 0) {
char *line;
if (asprintf(&line, "read-only %s", argv[i] + 12) == -1)
errExit("asprintf");
profile_check_line(line, 0, NULL); // will exit if something wrong
profile_add(line);
}
else if (strncmp(argv[i], "--noexec=", 9) == 0) {
char *line;
if (asprintf(&line, "noexec %s", argv[i] + 9) == -1)
errExit("asprintf");
profile_check_line(line, 0, NULL); // will exit if something wrong
profile_add(line);
}
else if (strncmp(argv[i], "--read-write=", 13) == 0) {
char *line;
if (asprintf(&line, "read-write %s", argv[i] + 13) == -1)
errExit("asprintf");
profile_check_line(line, 0, NULL); // will exit if something wrong
profile_add(line);
}
else if (strcmp(argv[i], "--disable-mnt") == 0)
arg_disable_mnt = 1;
#ifdef HAVE_OVERLAYFS
else if (strcmp(argv[i], "--overlay") == 0) {
if (checkcfg(CFG_OVERLAYFS)) {
if (arg_overlay) {
fprintf(stderr, "Error: only one overlay command is allowed\n");
exit(1);
}
if (cfg.chrootdir) {
fprintf(stderr, "Error: --overlay and --chroot options are mutually exclusive\n");
exit(1);
}
struct stat s;
if (stat("/proc/sys/kernel/grsecurity", &s) == 0) {
fprintf(stderr, "Error: --overlay option is not available on Grsecurity systems\n");
exit(1);
}
arg_overlay = 1;
arg_overlay_keep = 1;
char *subdirname;
if (asprintf(&subdirname, "%d", getpid()) == -1)
errExit("asprintf");
cfg.overlay_dir = fs_check_overlay_dir(subdirname, arg_overlay_reuse);
free(subdirname);
}
else
exit_err_feature("overlayfs");
}
else if (strncmp(argv[i], "--overlay-named=", 16) == 0) {
if (checkcfg(CFG_OVERLAYFS)) {
if (arg_overlay) {
fprintf(stderr, "Error: only one overlay command is allowed\n");
exit(1);
}
if (cfg.chrootdir) {
fprintf(stderr, "Error: --overlay and --chroot options are mutually exclusive\n");
exit(1);
}
struct stat s;
if (stat("/proc/sys/kernel/grsecurity", &s) == 0) {
fprintf(stderr, "Error: --overlay option is not available on Grsecurity systems\n");
exit(1);
}
arg_overlay = 1;
arg_overlay_keep = 1;
arg_overlay_reuse = 1;
char *subdirname = argv[i] + 16;
if (*subdirname == '\0') {
fprintf(stderr, "Error: invalid overlay option\n");
exit(1);
}
// check name
invalid_filename(subdirname, 0); // no globbing
if (strstr(subdirname, "..") || strstr(subdirname, "/")) {
fprintf(stderr, "Error: invalid overlay name\n");
exit(1);
}
cfg.overlay_dir = fs_check_overlay_dir(subdirname, arg_overlay_reuse);
}
else
exit_err_feature("overlayfs");
}
else if (strcmp(argv[i], "--overlay-tmpfs") == 0) {
if (checkcfg(CFG_OVERLAYFS)) {
if (arg_overlay) {
fprintf(stderr, "Error: only one overlay command is allowed\n");
exit(1);
}
if (cfg.chrootdir) {
fprintf(stderr, "Error: --overlay and --chroot options are mutually exclusive\n");
exit(1);
}
struct stat s;
if (stat("/proc/sys/kernel/grsecurity", &s) == 0) {
fprintf(stderr, "Error: --overlay option is not available on Grsecurity systems\n");
exit(1);
}
arg_overlay = 1;
}
else
exit_err_feature("overlayfs");
}
#endif
#ifdef HAVE_FIRETUNNEL
else if (strcmp(argv[i], "--tunnel") == 0) {
// try to connect to the default client side of the tunnel
// if this fails, try the default server side of the tunnel
if (access("/run/firetunnel/ftc", R_OK) == 0)
profile_read("/run/firetunnel/ftc");
else if (access("/run/firetunnel/fts", R_OK) == 0)
profile_read("/run/firetunnel/fts");
else {
fprintf(stderr, "Error: no default firetunnel found, please specify it using --tunnel=devname option\n");
exit(1);
}
}
else if (strncmp(argv[i], "--tunnel=", 9) == 0) {
char *fname;
if (asprintf(&fname, "/run/firetunnel/%s", argv[i] + 9) == -1)
errExit("asprintf");
invalid_filename(fname, 0); // no globbing
if (access(fname, R_OK) == 0)
profile_read(fname);
else {
fprintf(stderr, "Error: tunnel not found\n");
exit(1);
}
}
#endif
else if (strncmp(argv[i], "--profile=", 10) == 0) {
// multiple profile files are allowed!
if (arg_noprofile) {
fprintf(stderr, "Error: --noprofile and --profile options are mutually exclusive\n");
exit(1);
}
char *ppath = expand_macros(argv[i] + 10);
if (!ppath)
errExit("strdup");
// checking for strange chars in the file name, no globbing
invalid_filename(ppath, 0);
if (*ppath == ':' || access(ppath, R_OK) || is_dir(ppath)) {
int has_colon = (*ppath == ':');
char *ptr = ppath;
while (*ptr != '/' && *ptr != '.' && *ptr != '\0')
ptr++;
// profile path contains no / or . chars,
// assume its a profile name
if (*ptr != '\0') {
fprintf(stderr, "Error: inaccessible profile file: %s\n", ppath);
exit(1);
}
// profile was not read in previously, try to see if
// we were given a profile name.
if (!profile_find_firejail(ppath + has_colon, 1)) {
// do not fall through to default profile,
// because the user should be notified that
// given profile arg could not be used.
fprintf(stderr, "Error: no profile with name \"%s\" found.\n", ppath);
exit(1);
}
else
custom_profile = 1;
}
else {
profile_read(ppath);
custom_profile = 1;
}
free(ppath);
}
else if (strcmp(argv[i], "--noprofile") == 0) {
if (custom_profile) {
fprintf(stderr, "Error: --profile and --noprofile options are mutually exclusive\n");
exit(1);
}
arg_noprofile = 1;
}
else if (strncmp(argv[i], "--ignore=", 9) == 0) {
if (custom_profile) {
fprintf(stderr, "Error: please use --profile after --ignore\n");
exit(1);
}
profile_add_ignore(argv[i] + 9);
}
#ifdef HAVE_CHROOT
else if (strncmp(argv[i], "--chroot=", 9) == 0) {
if (checkcfg(CFG_CHROOT)) {
if (arg_overlay) {
fprintf(stderr, "Error: --overlay and --chroot options are mutually exclusive\n");
exit(1);
}
struct stat s;
if (stat("/proc/sys/kernel/grsecurity", &s) == 0) {
fprintf(stderr, "Error: --chroot option is not available on Grsecurity systems\n");
exit(1);
}
invalid_filename(argv[i] + 9, 0); // no globbing
// extract chroot dirname
cfg.chrootdir = argv[i] + 9;
// if the directory starts with ~, expand the home directory
if (*cfg.chrootdir == '~') {
char *tmp;
if (asprintf(&tmp, "%s%s", cfg.homedir, cfg.chrootdir + 1) == -1)
errExit("asprintf");
cfg.chrootdir = tmp;
}
if (strstr(cfg.chrootdir, "..") || is_link(cfg.chrootdir)) {
fprintf(stderr, "Error: invalid chroot directory %s\n", cfg.chrootdir);
return 1;
}
// check chroot dirname exists, don't allow "--chroot=/"
char *rpath = realpath(cfg.chrootdir, NULL);
if (rpath == NULL || strcmp(rpath, "/") == 0) {
fprintf(stderr, "Error: invalid chroot directory\n");
exit(1);
}
cfg.chrootdir = rpath;
// check chroot directory structure
fs_check_chroot_dir(cfg.chrootdir);
}
else
exit_err_feature("chroot");
}
#endif
else if (strcmp(argv[i], "--writable-etc") == 0) {
if (cfg.etc_private_keep) {
fprintf(stderr, "Error: --private-etc and --writable-etc are mutually exclusive\n");
exit(1);
}
arg_writable_etc = 1;
}
else if (strcmp(argv[i], "--writable-var") == 0) {
arg_writable_var = 1;
}
else if (strcmp(argv[i], "--keep-var-tmp") == 0) {
arg_keep_var_tmp = 1;
}
else if (strcmp(argv[i], "--writable-run-user") == 0) {
arg_writable_run_user = 1;
}
else if (strcmp(argv[i], "--writable-var-log") == 0) {
arg_writable_var_log = 1;
}
else if (strcmp(argv[i], "--machine-id") == 0) {
arg_machineid = 1;
}
else if (strcmp(argv[i], "--private") == 0) {
arg_private = 1;
}
else if (strncmp(argv[i], "--private=", 10) == 0) {
if (cfg.home_private_keep) {
fprintf(stderr, "Error: a private list of files was already defined with --private-home option.\n");
exit(1);
}
// extract private home dirname
cfg.home_private = argv[i] + 10;
if (*cfg.home_private == '\0') {
fprintf(stderr, "Error: invalid private option\n");
exit(1);
}
fs_check_private_dir();
// downgrade to --private if the directory is the user home directory
if (strcmp(cfg.home_private, cfg.homedir) == 0) {
free(cfg.home_private);
cfg.home_private = NULL;
}
arg_private = 1;
}
#ifdef HAVE_PRIVATE_HOME
else if (strncmp(argv[i], "--private-home=", 15) == 0) {
if (checkcfg(CFG_PRIVATE_HOME)) {
if (cfg.home_private) {
fprintf(stderr, "Error: a private home directory was already defined with --private option.\n");
exit(1);
}
// extract private home dirname
if (*(argv[i] + 15) == '\0') {
fprintf(stderr, "Error: invalid private-home option\n");
exit(1);
}
if (cfg.home_private_keep) {
if ( asprintf(&cfg.home_private_keep, "%s,%s", cfg.home_private_keep, argv[i] + 15) < 0 )
errExit("asprintf");
} else
cfg.home_private_keep = argv[i] + 15;
arg_private = 1;
}
else
exit_err_feature("private-home");
}
#endif
else if (strcmp(argv[i], "--private-dev") == 0) {
arg_private_dev = 1;
}
else if (strcmp(argv[i], "--keep-dev-shm") == 0) {
arg_keep_dev_shm = 1;
}
else if (strncmp(argv[i], "--private-etc=", 14) == 0) {
if (arg_writable_etc) {
fprintf(stderr, "Error: --private-etc and --writable-etc are mutually exclusive\n");
exit(1);
}
// extract private etc list
if (*(argv[i] + 14) == '\0') {
fprintf(stderr, "Error: invalid private-etc option\n");
exit(1);
}
if (cfg.etc_private_keep) {
if ( asprintf(&cfg.etc_private_keep, "%s,%s", cfg.etc_private_keep, argv[i] + 14) < 0 )
errExit("asprintf");
} else
cfg.etc_private_keep = argv[i] + 14;
arg_private_etc = 1;
}
else if (strncmp(argv[i], "--private-opt=", 14) == 0) {
// extract private opt list
if (*(argv[i] + 14) == '\0') {
fprintf(stderr, "Error: invalid private-opt option\n");
exit(1);
}
if (cfg.opt_private_keep) {
if ( asprintf(&cfg.opt_private_keep, "%s,%s", cfg.opt_private_keep, argv[i] + 14) < 0 )
errExit("asprintf");
} else
cfg.opt_private_keep = argv[i] + 14;
arg_private_opt = 1;
}
else if (strncmp(argv[i], "--private-srv=", 14) == 0) {
// extract private srv list
if (*(argv[i] + 14) == '\0') {
fprintf(stderr, "Error: invalid private-srv option\n");
exit(1);
}
if (cfg.srv_private_keep) {
if ( asprintf(&cfg.srv_private_keep, "%s,%s", cfg.srv_private_keep, argv[i] + 14) < 0 )
errExit("asprintf");
} else
cfg.srv_private_keep = argv[i] + 14;
arg_private_srv = 1;
}
else if (strncmp(argv[i], "--private-bin=", 14) == 0) {
// extract private bin list
if (*(argv[i] + 14) == '\0') {
fprintf(stderr, "Error: invalid private-bin option\n");
exit(1);
}
if (cfg.bin_private_keep) {
if ( asprintf(&cfg.bin_private_keep, "%s,%s", cfg.bin_private_keep, argv[i] + 14) < 0 )
errExit("asprintf");
} else
cfg.bin_private_keep = argv[i] + 14;
arg_private_bin = 1;
}
else if (strncmp(argv[i], "--private-lib", 13) == 0) {
if (checkcfg(CFG_PRIVATE_LIB)) {
// extract private lib list (if any)
if (argv[i][13] == '=') {
if (cfg.lib_private_keep) {
if (argv[i][14] != '\0' && asprintf(&cfg.lib_private_keep, "%s,%s", cfg.lib_private_keep, argv[i] + 14) < 0)
errExit("asprintf");
} else
cfg.lib_private_keep = argv[i] + 14;
}
arg_private_lib = 1;
}
else
exit_err_feature("private-lib");
}
else if (strcmp(argv[i], "--private-tmp") == 0) {
arg_private_tmp = 1;
}
else if (strcmp(argv[i], "--private-cache") == 0) {
if (checkcfg(CFG_PRIVATE_CACHE))
arg_private_cache = 1;
else
exit_err_feature("private-cache");
}
else if (strcmp(argv[i], "--private-cwd") == 0) {
cfg.cwd = NULL;
arg_private_cwd = 1;
}
else if (strncmp(argv[i], "--private-cwd=", 14) == 0) {
if (*(argv[i] + 14) == '\0') {
fprintf(stderr, "Error: invalid private-cwd option\n");
exit(1);
}
fs_check_private_cwd(argv[i] + 14);
arg_private_cwd = 1;
}
//*************************************
// hostname, etc
//*************************************
else if (strncmp(argv[i], "--name=", 7) == 0) {
cfg.name = argv[i] + 7;
if (strlen(cfg.name) == 0) {
fprintf(stderr, "Error: please provide a name for sandbox\n");
return 1;
}
}
else if (strncmp(argv[i], "--hostname=", 11) == 0) {
cfg.hostname = argv[i] + 11;
if (strlen(cfg.hostname) == 0) {
fprintf(stderr, "Error: please provide a hostname for sandbox\n");
return 1;
}
}
else if (strcmp(argv[i], "--nogroups") == 0)
arg_nogroups = 1;
#ifdef HAVE_USERNS
else if (strcmp(argv[i], "--noroot") == 0) {
if (checkcfg(CFG_USERNS))
check_user_namespace();
else
exit_err_feature("noroot");
}
#endif
else if (strcmp(argv[i], "--nonewprivs") == 0)
arg_nonewprivs = 1;
else if (strncmp(argv[i], "--env=", 6) == 0)
env_store(argv[i] + 6, SETENV);
else if (strncmp(argv[i], "--rmenv=", 8) == 0)
env_store(argv[i] + 8, RMENV);
else if (strcmp(argv[i], "--nosound") == 0)
arg_nosound = 1;
else if (strcmp(argv[i], "--noautopulse") == 0)
arg_noautopulse = 1;
else if (strcmp(argv[i], "--novideo") == 0)
arg_novideo = 1;
else if (strcmp(argv[i], "--no3d") == 0)
arg_no3d = 1;
else if (strcmp(argv[i], "--notv") == 0)
arg_notv = 1;
else if (strcmp(argv[i], "--nodvd") == 0)
arg_nodvd = 1;
else if (strcmp(argv[i], "--nou2f") == 0)
arg_nou2f = 1;
else if (strcmp(argv[i], "--nodbus") == 0)
arg_nodbus = 1;
//*************************************
// network
//*************************************
else if (strcmp(argv[i], "--net=none") == 0) {
arg_nonetwork = 1;
cfg.bridge0.configured = 0;
cfg.bridge1.configured = 0;
cfg.bridge2.configured = 0;
cfg.bridge3.configured = 0;
cfg.interface0.configured = 0;
cfg.interface1.configured = 0;
cfg.interface2.configured = 0;
cfg.interface3.configured = 0;
continue;
}
#ifdef HAVE_NETWORK
else if (strncmp(argv[i], "--interface=", 12) == 0) {
if (checkcfg(CFG_NETWORK)) {
// checks
if (arg_nonetwork) {
fprintf(stderr, "Error: --network=none and --interface are incompatible\n");
exit(1);
}
if (strcmp(argv[i] + 12, "lo") == 0) {
fprintf(stderr, "Error: cannot use lo device in --interface command\n");
exit(1);
}
int ifindex = if_nametoindex(argv[i] + 12);
if (ifindex <= 0) {
fprintf(stderr, "Error: cannot find interface %s\n", argv[i] + 12);
exit(1);
}
Interface *intf;
if (cfg.interface0.configured == 0)
intf = &cfg.interface0;
else if (cfg.interface1.configured == 0)
intf = &cfg.interface1;
else if (cfg.interface2.configured == 0)
intf = &cfg.interface2;
else if (cfg.interface3.configured == 0)
intf = &cfg.interface3;
else {
fprintf(stderr, "Error: maximum 4 interfaces are allowed\n");
return 1;
}
intf->dev = strdup(argv[i] + 12);
if (!intf->dev)
errExit("strdup");
if (net_get_if_addr(intf->dev, &intf->ip, &intf->mask, intf->mac, &intf->mtu)) {
fwarning("interface %s is not configured\n", intf->dev);
}
intf->configured = 1;
}
else
exit_err_feature("networking");
}
else if (strncmp(argv[i], "--net=", 6) == 0) {
if (checkcfg(CFG_NETWORK)) {
if (strcmp(argv[i] + 6, "none") == 0) {
arg_nonetwork = 1;
cfg.bridge0.configured = 0;
cfg.bridge1.configured = 0;
cfg.bridge2.configured = 0;
cfg.bridge3.configured = 0;
cfg.interface0.configured = 0;
cfg.interface1.configured = 0;
cfg.interface2.configured = 0;
cfg.interface3.configured = 0;
continue;
}
if (strcmp(argv[i] + 6, "lo") == 0) {
fprintf(stderr, "Error: cannot attach to lo device\n");
exit(1);
}
Bridge *br;
if (cfg.bridge0.configured == 0)
br = &cfg.bridge0;
else if (cfg.bridge1.configured == 0)
br = &cfg.bridge1;
else if (cfg.bridge2.configured == 0)
br = &cfg.bridge2;
else if (cfg.bridge3.configured == 0)
br = &cfg.bridge3;
else {
fprintf(stderr, "Error: maximum 4 network devices are allowed\n");
return 1;
}
br->dev = argv[i] + 6;
br->configured = 1;
}
else
exit_err_feature("networking");
}
else if (strncmp(argv[i], "--veth-name=", 12) == 0) {
if (checkcfg(CFG_NETWORK)) {
Bridge *br = last_bridge_configured();
if (br == NULL) {
fprintf(stderr, "Error: no network device configured\n");
exit(1);
}
br->veth_name = strdup(argv[i] + 12);
if (br->veth_name == NULL)
errExit("strdup");
if (*br->veth_name == '\0') {
fprintf(stderr, "Error: no veth-name configured\n");
exit(1);
}
}
else
exit_err_feature("networking");
}
else if (strcmp(argv[i], "--scan") == 0) {
if (checkcfg(CFG_NETWORK)) {
arg_scan = 1;
}
else
exit_err_feature("networking");
}
else if (strncmp(argv[i], "--iprange=", 10) == 0) {
if (checkcfg(CFG_NETWORK)) {
Bridge *br = last_bridge_configured();
if (br == NULL) {
fprintf(stderr, "Error: no network device configured\n");
return 1;
}
if (br->iprange_start || br->iprange_end) {
fprintf(stderr, "Error: cannot configure the IP range twice for the same interface\n");
return 1;
}
// parse option arguments
char *firstip = argv[i] + 10;
char *secondip = firstip;
while (*secondip != '\0') {
if (*secondip == ',')
break;
secondip++;
}
if (*secondip == '\0') {
fprintf(stderr, "Error: invalid IP range\n");
return 1;
}
*secondip = '\0';
secondip++;
// check addresses
if (atoip(firstip, &br->iprange_start) || atoip(secondip, &br->iprange_end) ||
br->iprange_start >= br->iprange_end) {
fprintf(stderr, "Error: invalid IP range\n");
return 1;
}
}
else
exit_err_feature("networking");
}
else if (strncmp(argv[i], "--mac=", 6) == 0) {
if (checkcfg(CFG_NETWORK)) {
Bridge *br = last_bridge_configured();
if (br == NULL) {
fprintf(stderr, "Error: no network device configured\n");
exit(1);
}
if (mac_not_zero(br->macsandbox)) {
fprintf(stderr, "Error: cannot configure the MAC address twice for the same interface\n");
exit(1);
}
// read the address
if (atomac(argv[i] + 6, br->macsandbox)) {
fprintf(stderr, "Error: invalid MAC address\n");
exit(1);
}
}
else
exit_err_feature("networking");
}
else if (strncmp(argv[i], "--mtu=", 6) == 0) {
if (checkcfg(CFG_NETWORK)) {
Bridge *br = last_bridge_configured();
if (br == NULL) {
fprintf(stderr, "Error: no network device configured\n");
exit(1);
}
if (sscanf(argv[i] + 6, "%d", &br->mtu) != 1 || br->mtu < 576 || br->mtu > 9198) {
fprintf(stderr, "Error: invalid mtu value\n");
exit(1);
}
}
else
exit_err_feature("networking");
}
else if (strncmp(argv[i], "--ip=", 5) == 0) {
if (checkcfg(CFG_NETWORK)) {
Bridge *br = last_bridge_configured();
if (br == NULL) {
fprintf(stderr, "Error: no network device configured\n");
exit(1);
}
if (br->arg_ip_none || br->ipsandbox) {
fprintf(stderr, "Error: cannot configure the IP address twice for the same interface\n");
exit(1);
}
// configure this IP address for the last bridge defined
if (strcmp(argv[i] + 5, "none") == 0)
br->arg_ip_none = 1;
else {
if (atoip(argv[i] + 5, &br->ipsandbox)) {
fprintf(stderr, "Error: invalid IP address\n");
exit(1);
}
}
}
else
exit_err_feature("networking");
}
else if (strncmp(argv[i], "--netmask=", 10) == 0) {
if (checkcfg(CFG_NETWORK)) {
Bridge *br = last_bridge_configured();
if (br == NULL) {
fprintf(stderr, "Error: no network device configured\n");
exit(1);
}
if (br->arg_ip_none || br->mask) {
fprintf(stderr, "Error: cannot configure the network mask twice for the same interface\n");
exit(1);
}
// configure this network mask for the last bridge defined
if (atoip(argv[i] + 10, &br->mask)) {
fprintf(stderr, "Error: invalid network mask\n");
exit(1);
}
}
else
exit_err_feature("networking");
}
else if (strncmp(argv[i], "--ip6=", 6) == 0) {
if (checkcfg(CFG_NETWORK)) {
Bridge *br = last_bridge_configured();
if (br == NULL) {
fprintf(stderr, "Error: no network device configured\n");
exit(1);
}
if (br->ip6sandbox) {
fprintf(stderr, "Error: cannot configure the IP address twice for the same interface\n");
exit(1);
}
// configure this IP address for the last bridge defined
if (check_ip46_address(argv[i] + 6) == 0) {
fprintf(stderr, "Error: invalid IPv6 address\n");
exit(1);
}
br->ip6sandbox = strdup(argv[i] + 6);
if (br->ip6sandbox == NULL)
errExit("strdup");
}
else
exit_err_feature("networking");
}
else if (strncmp(argv[i], "--defaultgw=", 12) == 0) {
if (checkcfg(CFG_NETWORK)) {
if (atoip(argv[i] + 12, &cfg.defaultgw)) {
fprintf(stderr, "Error: invalid IP address\n");
exit(1);
}
}
else
exit_err_feature("networking");
}
#endif
else if (strncmp(argv[i], "--dns=", 6) == 0) {
if (check_ip46_address(argv[i] + 6) == 0) {
fprintf(stderr, "Error: invalid DNS server IPv4 or IPv6 address\n");
exit(1);
}
char *dns = strdup(argv[i] + 6);
if (!dns)
errExit("strdup");
if (cfg.dns1 == NULL)
cfg.dns1 = dns;
else if (cfg.dns2 == NULL)
cfg.dns2 = dns;
else if (cfg.dns3 == NULL)
cfg.dns3 = dns;
else if (cfg.dns4 == NULL)
cfg.dns4 = dns;
else {
fprintf(stderr, "Error: up to 4 DNS servers can be specified\n");
free(dns);
return 1;
}
}
else if (strncmp(argv[i], "--hosts-file=", 13) == 0)
cfg.hosts_file = fs_check_hosts_file(argv[i] + 13);
#ifdef HAVE_NETWORK
else if (strcmp(argv[i], "--netfilter") == 0) {
if (checkcfg(CFG_NETWORK)) {
arg_netfilter = 1;
}
else
exit_err_feature("networking");
}
else if (strncmp(argv[i], "--netfilter=", 12) == 0) {
if (checkcfg(CFG_NETWORK)) {
arg_netfilter = 1;
arg_netfilter_file = argv[i] + 12;
check_netfilter_file(arg_netfilter_file);
}
else
exit_err_feature("networking");
}
else if (strncmp(argv[i], "--netfilter6=", 13) == 0) {
if (checkcfg(CFG_NETWORK)) {
arg_netfilter6 = 1;
arg_netfilter6_file = argv[i] + 13;
check_netfilter_file(arg_netfilter6_file);
}
else
exit_err_feature("networking");
}
else if (strncmp(argv[i], "--netns=", 8) == 0) {
if (checkcfg(CFG_NETWORK)) {
arg_netns = argv[i] + 8;
check_netns(arg_netns);
}
else
exit_err_feature("networking");
}
#endif
//*************************************
// command
//*************************************
else if (strncmp(argv[i], "--timeout=", 10) == 0)
cfg.timeout = extract_timeout(argv[i] + 10);
else if (strcmp(argv[i], "--audit") == 0) {
arg_audit_prog = LIBDIR "/firejail/faudit";
arg_audit = 1;
}
else if (strncmp(argv[i], "--audit=", 8) == 0) {
if (strlen(argv[i] + 8) == 0) {
fprintf(stderr, "Error: invalid audit program\n");
exit(1);
}
arg_audit_prog = strdup(argv[i] + 8);
if (!arg_audit_prog)
errExit("strdup");
struct stat s;
if (stat(arg_audit_prog, &s) != 0) {
fprintf(stderr, "Error: cannot find the audit program %s\n", arg_audit_prog);
exit(1);
}
arg_audit = 1;
}
else if (strcmp(argv[i], "--appimage") == 0)
arg_appimage = 1;
else if (strcmp(argv[i], "--shell=none") == 0) {
arg_shell_none = 1;
if (cfg.shell) {
fprintf(stderr, "Error: a shell was already specified\n");
return 1;
}
}
else if (strncmp(argv[i], "--shell=", 8) == 0) {
if (arg_shell_none) {
fprintf(stderr, "Error: --shell=none was already specified.\n");
return 1;
}
invalid_filename(argv[i] + 8, 0); // no globbing
if (cfg.shell) {
fprintf(stderr, "Error: only one user shell can be specified\n");
return 1;
}
cfg.shell = argv[i] + 8;
if (is_dir(cfg.shell) || strstr(cfg.shell, "..")) {
fprintf(stderr, "Error: invalid shell\n");
exit(1);
}
// access call checks as real UID/GID, not as effective UID/GID
if(cfg.chrootdir) {
char *shellpath;
if (asprintf(&shellpath, "%s%s", cfg.chrootdir, cfg.shell) == -1)
errExit("asprintf");
if (access(shellpath, X_OK)) {
fprintf(stderr, "Error: cannot access shell file in chroot\n");
exit(1);
}
free(shellpath);
} else if (access(cfg.shell, X_OK)) {
fprintf(stderr, "Error: cannot access shell file\n");
exit(1);
}
}
else if (strcmp(argv[i], "-c") == 0) {
arg_command = 1;
if (i == (argc - 1)) {
fprintf(stderr, "Error: option -c requires an argument\n");
return 1;
}
}
// unlike all other x11 features, this is available always
else if (strcmp(argv[i], "--x11=none") == 0) {
arg_x11_block = 1;
}
#ifdef HAVE_X11
else if (strcmp(argv[i], "--x11=xorg") == 0) {
if (checkcfg(CFG_X11))
arg_x11_xorg = 1;
else
exit_err_feature("x11");
}
#endif
else if (strncmp(argv[i], "--join-or-start=", 16) == 0) {
// NOTE: this is second part of option handler,
// atempt to find and join sandbox is done in other one
// set sandbox name and start normally
cfg.name = argv[i] + 16;
if (strlen(cfg.name) == 0) {
fprintf(stderr, "Error: please provide a name for sandbox\n");
return 1;
}
}
else if (strcmp(argv[i], "--deterministic-exit-code") == 0) {
arg_deterministic_exit_code = 1;
}
else {
// double dash - positional params to follow
if (strcmp(argv[i], "--") == 0) {
arg_doubledash = 1;
i++;
if (i >= argc) {
fprintf(stderr, "Error: program name not found\n");
exit(1);
}
}
// is this an invalid option?
else if (*argv[i] == '-') {
fprintf(stderr, "Error: invalid %s command line option\n", argv[i]);
return 1;
}
// we have a program name coming
if (arg_appimage) {
cfg.command_name = strdup(argv[i]);
if (!cfg.command_name)
errExit("strdup");
// disable shell=* for appimages
arg_shell_none = 0;
}
else
extract_command_name(i, argv);
prog_index = i;
break;
}
}
EUID_ASSERT();
// exit chroot, overlay and appimage sandboxes when caps are explicitly specified on command line
if (getuid() != 0 && arg_caps_cmdline) {
char *opt = NULL;
if (arg_appimage)
opt = "appimage";
else if (arg_overlay)
opt = "overlay";
else if (cfg.chrootdir)
opt = "chroot";
if (opt) {
fprintf(stderr, "Error: all capabilities are dropped for %s by default.\n"
"Please remove --caps options from the command line.\n", opt);
exit(1);
}
}
// prog_index could still be -1 if no program was specified
if (prog_index == -1 && arg_shell_none) {
fprintf(stderr, "Error: shell=none configured, but no program specified\n");
exit(1);
}
// check trace configuration
if (arg_trace && arg_tracelog) {
fwarning("--trace and --tracelog are mutually exclusive; --tracelog disabled\n");
}
// check user namespace (--noroot) options
if (arg_noroot) {
if (arg_overlay) {
fwarning("--overlay and --noroot are mutually exclusive, --noroot disabled...\n");
arg_noroot = 0;
}
else if (cfg.chrootdir) {
fwarning("--chroot and --noroot are mutually exclusive, --noroot disabled...\n");
arg_noroot = 0;
}
}
// enable seccomp if only seccomp.block-secondary was specified
if (arg_seccomp_block_secondary)
arg_seccomp = 1;
// log command
logargs(argc, argv);
if (fullargc) {
char *msg;
if (asprintf(&msg, "user %s entering restricted shell", cfg.username) == -1)
errExit("asprintf");
logmsg(msg);
free(msg);
}
// guess shell if unspecified
if (!arg_shell_none && !cfg.shell) {
cfg.shell = guess_shell();
if (!cfg.shell) {
fprintf(stderr, "Error: unable to guess your shell, please set explicitly by using --shell option.\n");
exit(1);
}
if (arg_debug)
printf("Autoselecting %s as shell\n", cfg.shell);
}
// build the sandbox command
if (prog_index == -1 && cfg.shell) {
cfg.command_line = cfg.shell;
cfg.window_title = cfg.shell;
cfg.command_name = cfg.shell;
}
else if (arg_appimage) {
if (arg_debug)
printf("Configuring appimage environment\n");
appimage_set(cfg.command_name);
build_appimage_cmdline(&cfg.command_line, &cfg.window_title, argc, argv, prog_index, cfg.command_line);
}
else {
build_cmdline(&cfg.command_line, &cfg.window_title, argc, argv, prog_index);
}
/* else {
fprintf(stderr, "Error: command must be specified when --shell=none used.\n");
exit(1);
}*/
assert(cfg.command_name);
if (arg_debug)
printf("Command name #%s#\n", cfg.command_name);
// load the profile
if (!arg_noprofile && !custom_profile) {
custom_profile = profile_find_firejail(cfg.command_name, 1);
}
// use default.profile as the default
if (!custom_profile && !arg_noprofile) {
char *profile_name = DEFAULT_USER_PROFILE;
if (getuid() == 0)
profile_name = DEFAULT_ROOT_PROFILE;
if (arg_debug)
printf("Attempting to find %s.profile...\n", profile_name);
custom_profile = profile_find_firejail(profile_name, 1);
if (!custom_profile) {
fprintf(stderr, "Error: no default.profile installed\n");
exit(1);
}
if (custom_profile)
fmessage("\n** Note: you can use --noprofile to disable %s.profile **\n\n", profile_name);
}
EUID_ASSERT();
// block X11 sockets
if (arg_x11_block)
x11_block();
// check network configuration options - it will exit if anything went wrong
net_check_cfg();
// check and assign an IP address - for macvlan it will be done again in the sandbox!
if (any_bridge_configured()) {
EUID_ROOT();
lockfd_network = open(RUN_NETWORK_LOCK_FILE, O_WRONLY | O_CREAT, S_IRUSR | S_IWUSR);
if (lockfd_network != -1) {
int rv = fchown(lockfd_network, 0, 0);
(void) rv;
flock(lockfd_network, LOCK_EX);
}
if (cfg.bridge0.configured && cfg.bridge0.arg_ip_none == 0)
check_network(&cfg.bridge0);
if (cfg.bridge1.configured && cfg.bridge1.arg_ip_none == 0)
check_network(&cfg.bridge1);
if (cfg.bridge2.configured && cfg.bridge2.arg_ip_none == 0)
check_network(&cfg.bridge2);
if (cfg.bridge3.configured && cfg.bridge3.arg_ip_none == 0)
check_network(&cfg.bridge3);
// save network mapping in shared memory
network_set_run_file(sandbox_pid);
EUID_USER();
}
EUID_ASSERT();
// create the parent-child communication pipe
if (pipe(parent_to_child_fds) < 0)
errExit("pipe");
if (pipe(child_to_parent_fds) < 0)
errExit("pipe");
if (arg_noroot && arg_overlay) {
fwarning("--overlay and --noroot are mutually exclusive, noroot disabled\n");
arg_noroot = 0;
}
else if (arg_noroot && cfg.chrootdir) {
fwarning("--chroot and --noroot are mutually exclusive, noroot disabled\n");
arg_noroot = 0;
}
// set name and x11 run files
EUID_ROOT();
lockfd_directory = open(RUN_DIRECTORY_LOCK_FILE, O_WRONLY | O_CREAT, S_IRUSR | S_IWUSR);
if (lockfd_directory != -1) {
int rv = fchown(lockfd_directory, 0, 0);
(void) rv;
flock(lockfd_directory, LOCK_EX);
}
if (cfg.name)
set_name_run_file(sandbox_pid);
int display = x11_display();
if (display > 0)
set_x11_run_file(sandbox_pid, display);
if (lockfd_directory != -1) {
flock(lockfd_directory, LOCK_UN);
close(lockfd_directory);
}
EUID_USER();
// clone environment
int flags = CLONE_NEWNS | CLONE_NEWPID | CLONE_NEWUTS | SIGCHLD;
// in root mode also enable CLONE_NEWIPC
// in user mode CLONE_NEWIPC will break MIT Shared Memory Extension (MIT-SHM)
if (getuid() == 0 || arg_ipc) {
flags |= CLONE_NEWIPC;
if (arg_debug)
printf("Enabling IPC namespace\n");
}
if (any_bridge_configured() || any_interface_configured() || arg_nonetwork) {
flags |= CLONE_NEWNET;
}
else if (arg_debug)
printf("Using the local network stack\n");
EUID_ASSERT();
EUID_ROOT();
#ifdef __ia64__
child = __clone2(sandbox,
child_stack,
STACK_SIZE,
flags,
NULL);
#else
child = clone(sandbox,
child_stack + STACK_SIZE,
flags,
NULL);
#endif
if (child == -1)
errExit("clone");
EUID_USER();
if (!arg_command && !arg_quiet) {
fmessage("Parent pid %u, child pid %u\n", sandbox_pid, child);
// print the path of the new log directory
if (getuid() == 0) // only for root
printf("The new log directory is /proc/%d/root/var/log\n", child);
}
if (!arg_nonetwork) {
EUID_ROOT();
pid_t net_child = fork();
if (net_child < 0)
errExit("fork");
if (net_child == 0) {
// elevate privileges in order to get grsecurity working
if (setreuid(0, 0))
errExit("setreuid");
if (setregid(0, 0))
errExit("setregid");
network_main(child);
if (arg_debug)
printf("Host network configured\n");
#ifdef HAVE_GCOV
__gcov_flush();
#endif
_exit(0);
}
// wait for the child to finish
waitpid(net_child, NULL, 0);
EUID_USER();
}
EUID_ASSERT();
// close each end of the unused pipes
close(parent_to_child_fds[0]);
close(child_to_parent_fds[1]);
// notify child that base setup is complete
notify_other(parent_to_child_fds[1]);
// wait for child to create new user namespace with CLONE_NEWUSER
wait_for_other(child_to_parent_fds[0]);
close(child_to_parent_fds[0]);
if (arg_noroot) {
// update the UID and GID maps in the new child user namespace
// uid
char *map_path;
if (asprintf(&map_path, "/proc/%d/uid_map", child) == -1)
errExit("asprintf");
char *map;
uid_t uid = getuid();
if (asprintf(&map, "%d %d 1", uid, uid) == -1)
errExit("asprintf");
EUID_ROOT();
update_map(map, map_path);
EUID_USER();
free(map);
free(map_path);
// gid file
if (asprintf(&map_path, "/proc/%d/gid_map", child) == -1)
errExit("asprintf");
char gidmap[1024];
char *ptr = gidmap;
*ptr = '\0';
// add user group
gid_t gid = getgid();
sprintf(ptr, "%d %d 1\n", gid, gid);
ptr += strlen(ptr);
if (!arg_nogroups) {
// add tty group
gid_t g = get_group_id("tty");
if (g) {
sprintf(ptr, "%d %d 1\n", g, g);
ptr += strlen(ptr);
}
// add audio group
g = get_group_id("audio");
if (g) {
sprintf(ptr, "%d %d 1\n", g, g);
ptr += strlen(ptr);
}
// add video group
g = get_group_id("video");
if (g) {
sprintf(ptr, "%d %d 1\n", g, g);
ptr += strlen(ptr);
}
// add games group
g = get_group_id("games");
if (g) {
sprintf(ptr, "%d %d 1\n", g, g);
}
}
EUID_ROOT();
update_map(gidmap, map_path);
EUID_USER();
free(map_path);
}
EUID_ASSERT();
// notify child that UID/GID mapping is complete
notify_other(parent_to_child_fds[1]);
close(parent_to_child_fds[1]);
EUID_ROOT();
if (lockfd_network != -1) {
flock(lockfd_network, LOCK_UN);
close(lockfd_network);
}
EUID_USER();
int status = 0;
//*****************************
// following code is signal-safe
// handle CTRL-C in parent
install_handler();
// wait for the child to finish
waitpid(child, &status, 0);
// restore default signal actions
signal(SIGTERM, SIG_DFL);
signal(SIGINT, SIG_DFL);
// end of signal-safe code
//*****************************
// free globals
if (cfg.profile) {
ProfileEntry *prf = cfg.profile;
while (prf != NULL) {
ProfileEntry *next = prf->next;
free(prf->data);
free(prf->link);
free(prf);
prf = next;
}
}
if (WIFEXITED(status)){
myexit(WEXITSTATUS(status));
} else if (WIFSIGNALED(status)) {
myexit(WTERMSIG(status));
} else {
myexit(0);
}
return 0;
}
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