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/*
* Copyright (C) 2014-2017 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 "fseccomp.h"
#include "../include/seccomp.h"
#include <sys/syscall.h>
static void add_default_list(int fd, int allow_debuggers) {
#ifdef SYS_mount
filter_add_blacklist(fd, SYS_mount, 0);
#endif
#ifdef SYS_umount2
filter_add_blacklist(fd, SYS_umount2, 0);
#endif
if (!allow_debuggers) {
#ifdef SYS_ptrace
filter_add_blacklist(fd, SYS_ptrace, 0);
#endif
}
#ifdef SYS_kexec_load
filter_add_blacklist(fd, SYS_kexec_load, 0);
#endif
#ifdef SYS_kexec_file_load
filter_add_blacklist(fd, SYS_kexec_file_load, 0);
#endif
#ifdef SYS_open_by_handle_at
filter_add_blacklist(fd, SYS_open_by_handle_at, 0);
#endif
#ifdef SYS_name_to_handle_at
filter_add_blacklist(fd, SYS_name_to_handle_at, 0);
#endif
#ifdef SYS_init_module
filter_add_blacklist(fd, SYS_init_module, 0);
#endif
#ifdef SYS_finit_module
filter_add_blacklist(fd, SYS_finit_module, 0);
#endif
#ifdef SYS_create_module
filter_add_blacklist(fd, SYS_create_module, 0);
#endif
#ifdef SYS_delete_module
filter_add_blacklist(fd, SYS_delete_module, 0);
#endif
#ifdef SYS_iopl
filter_add_blacklist(fd, SYS_iopl, 0);
#endif
#ifdef SYS_ioperm
filter_add_blacklist(fd, SYS_ioperm, 0);
#endif
#ifdef SYS_ioprio_set
filter_add_blacklist(fd, SYS_ioprio_set, 0);
#endif
#ifdef SYS_ni_syscall
filter_add_blacklist(fd, SYS_ni_syscall, 0);
#endif
#ifdef SYS_swapon
filter_add_blacklist(fd, SYS_swapon, 0);
#endif
#ifdef SYS_swapoff
filter_add_blacklist(fd, SYS_swapoff, 0);
#endif
#ifdef SYS_syslog
filter_add_blacklist(fd, SYS_syslog, 0);
#endif
if (!allow_debuggers) {
#ifdef SYS_process_vm_readv
filter_add_blacklist(fd, SYS_process_vm_readv, 0);
#endif
}
#ifdef SYS_process_vm_writev
filter_add_blacklist(fd, SYS_process_vm_writev, 0);
#endif
//#ifdef SYS_mknod - emoved in 0.9.29 - it breaks Zotero extension
// filter_add_blacklist(SYS_mknod, 0);
//#endif
#ifdef SYS_sysfs
filter_add_blacklist(fd, SYS_sysfs, 0);
#endif
#ifdef SYS__sysctl
filter_add_blacklist(fd, SYS__sysctl, 0);
#endif
#ifdef SYS_adjtimex
filter_add_blacklist(fd, SYS_adjtimex, 0);
#endif
#ifdef SYS_clock_adjtime
filter_add_blacklist(fd, SYS_clock_adjtime, 0);
#endif
#ifdef SYS_lookup_dcookie
filter_add_blacklist(fd, SYS_lookup_dcookie, 0);
#endif
#ifdef SYS_perf_event_open
filter_add_blacklist(fd, SYS_perf_event_open, 0);
#endif
#ifdef SYS_fanotify_init
filter_add_blacklist(fd, SYS_fanotify_init, 0);
#endif
#ifdef SYS_kcmp
filter_add_blacklist(fd, SYS_kcmp, 0);
#endif
#ifdef SYS_add_key
filter_add_blacklist(fd, SYS_add_key, 0);
#endif
#ifdef SYS_request_key
filter_add_blacklist(fd, SYS_request_key, 0);
#endif
#ifdef SYS_keyctl
filter_add_blacklist(fd, SYS_keyctl, 0);
#endif
#ifdef SYS_uselib
filter_add_blacklist(fd, SYS_uselib, 0);
#endif
#ifdef SYS_acct
filter_add_blacklist(fd, SYS_acct, 0);
#endif
#ifdef SYS_modify_ldt
filter_add_blacklist(fd, SYS_modify_ldt, 0);
#endif
#ifdef SYS_pivot_root
filter_add_blacklist(fd, SYS_pivot_root, 0);
#endif
#ifdef SYS_io_setup
filter_add_blacklist(fd, SYS_io_setup, 0);
#endif
#ifdef SYS_io_destroy
filter_add_blacklist(fd, SYS_io_destroy, 0);
#endif
#ifdef SYS_io_getevents
filter_add_blacklist(fd, SYS_io_getevents, 0);
#endif
#ifdef SYS_io_submit
filter_add_blacklist(fd, SYS_io_submit, 0);
#endif
#ifdef SYS_io_cancel
filter_add_blacklist(fd, SYS_io_cancel, 0);
#endif
#ifdef SYS_remap_file_pages
filter_add_blacklist(fd, SYS_remap_file_pages, 0);
#endif
#ifdef SYS_mbind
filter_add_blacklist(fd, SYS_mbind, 0);
#endif
#ifdef SYS_get_mempolicy
filter_add_blacklist(fd, SYS_get_mempolicy, 0);
#endif
#ifdef SYS_set_mempolicy
filter_add_blacklist(fd, SYS_set_mempolicy, 0);
#endif
#ifdef SYS_migrate_pages
filter_add_blacklist(fd, SYS_migrate_pages, 0);
#endif
#ifdef SYS_move_pages
filter_add_blacklist(fd, SYS_move_pages, 0);
#endif
#ifdef SYS_vmsplice
filter_add_blacklist(fd, SYS_vmsplice, 0);
#endif
#ifdef SYS_chroot
filter_add_blacklist(fd, SYS_chroot, 0);
#endif
#ifdef SYS_tuxcall
filter_add_blacklist(fd, SYS_tuxcall, 0);
#endif
#ifdef SYS_reboot
filter_add_blacklist(fd, SYS_reboot, 0);
#endif
#ifdef SYS_nfsservctl
filter_add_blacklist(fd, SYS_nfsservctl, 0);
#endif
#ifdef SYS_get_kernel_syms
filter_add_blacklist(fd, SYS_get_kernel_syms, 0);
#endif
// 0.9.45
#ifdef SYS_bpf
filter_add_blacklist(fd, SYS_bpf, 0);
#endif
#ifdef SYS_clock_settime
filter_add_blacklist(fd, SYS_clock_settime, 0);
#endif
//#ifdef SYS_clone - in use by Firejail
// filter_add_blacklist(fd, SYS_clone, 0);
//#endif
#ifdef SYS_personality
filter_add_blacklist(fd, SYS_personality, 0);
#endif
#ifdef SYS_process_vm_writev
filter_add_blacklist(fd, SYS_process_vm_writev, 0);
#endif
#ifdef SYS_query_module
filter_add_blacklist(fd, SYS_query_module, 0);
#endif
//#ifdef SYS_quotactl - in use by Firefox
// filter_add_blacklist(fd, SYS_quotactl, 0);
//#endif
//#ifdef SYS_setns - in use by Firejail
// filter_add_blacklist(fd, SYS_setns, 0);
//#endif
#ifdef SYS_settimeofday
filter_add_blacklist(fd, SYS_settimeofday, 0);
#endif
#ifdef SYS_stime
filter_add_blacklist(fd, SYS_stime, 0);
#endif
#ifdef SYS_umount
filter_add_blacklist(fd, SYS_umount, 0);
#endif
//#ifdef SYS_unshare - in use by Firejail
// filter_add_blacklist(fd, SYS_unshare, 0);
//#endif
#ifdef SYS_userfaultfd
filter_add_blacklist(fd, SYS_userfaultfd, 0);
#endif
#ifdef SYS_ustat
filter_add_blacklist(fd, SYS_ustat, 0);
#endif
#ifdef SYS_vm86
filter_add_blacklist(fd, SYS_vm86, 0);
#endif
#ifdef SYS_vm86old
filter_add_blacklist(fd, SYS_vm86old, 0);
#endif
#ifdef SYS_afs_syscall
filter_add_blacklist(fd, SYS_afs_syscall, 0);
#endif
#ifdef SYS_bdflush
filter_add_blacklist(fd, SYS_bdflush, 0);
#endif
#ifdef SYS_break
filter_add_blacklist(fd, SYS_break, 0);
#endif
#ifdef SYS_ftime
filter_add_blacklist(fd, SYS_ftime, 0);
#endif
#ifdef SYS_getpmsg
filter_add_blacklist(fd, SYS_getpmsg, 0);
#endif
#ifdef SYS_gtty
filter_add_blacklist(fd, SYS_gtty, 0);
#endif
#ifdef SYS_lock
filter_add_blacklist(fd, SYS_lock, 0);
#endif
#ifdef SYS_mpx
filter_add_blacklist(fd, SYS_mpx, 0);
#endif
#ifdef SYS_pciconfig_iobase
filter_add_blacklist(fd, SYS_pciconfig_iobase, 0);
#endif
#ifdef SYS_pciconfig_read
filter_add_blacklist(fd, SYS_pciconfig_read, 0);
#endif
#ifdef SYS_pciconfig_write
filter_add_blacklist(fd, SYS_pciconfig_write, 0);
#endif
#ifdef SYS_prof
filter_add_blacklist(fd, SYS_prof, 0);
#endif
#ifdef SYS_profil
filter_add_blacklist(fd, SYS_profil, 0);
#endif
#ifdef SYS_putpmsg
filter_add_blacklist(fd, SYS_putpmsg, 0);
#endif
#ifdef SYS_rtas
filter_add_blacklist(fd, SYS_rtas, 0);
#endif
#ifdef SYS_s390_runtime_instr
filter_add_blacklist(fd, SYS_s390_runtime_instr, 0);
#endif
#ifdef SYS_s390_mmio_read
filter_add_blacklist(fd, SYS_s390_mmio_read, 0);
#endif
#ifdef SYS_s390_mmio_write
filter_add_blacklist(fd, SYS_s390_mmio_write, 0);
#endif
#ifdef SYS_security
filter_add_blacklist(fd, SYS_security, 0);
#endif
#ifdef SYS_setdomainname
filter_add_blacklist(fd, SYS_setdomainname, 0);
#endif
#ifdef SYS_sethostname
filter_add_blacklist(fd, SYS_sethostname, 0);
#endif
#ifdef SYS_sgetmask
filter_add_blacklist(fd, SYS_sgetmask, 0);
#endif
#ifdef SYS_ssetmask
filter_add_blacklist(fd, SYS_ssetmask, 0);
#endif
#ifdef SYS_stty
filter_add_blacklist(fd, SYS_stty, 0);
#endif
#ifdef SYS_subpage_prot
filter_add_blacklist(fd, SYS_subpage_prot, 0);
#endif
#ifdef SYS_switch_endian
filter_add_blacklist(fd, SYS_switch_endian, 0);
#endif
#ifdef SYS_sys_debug_setcontext
filter_add_blacklist(fd, SYS_sys_debug_setcontext, 0);
#endif
#ifdef SYS_ulimit
filter_add_blacklist(fd, SYS_ulimit, 0);
#endif
#ifdef SYS_vhangup
filter_add_blacklist(fd, SYS_vhangup, 0);
#endif
#ifdef SYS_vserver
filter_add_blacklist(fd, SYS_vserver, 0);
#endif
}
// default list
void seccomp_default(const char *fname, int allow_debuggers) {
assert(fname);
// open file
int fd = open(fname, O_CREAT|O_WRONLY|O_TRUNC, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
if (fd < 0) {
fprintf(stderr, "Error fseccomp: cannot open %s file\n", fname);
exit(1);
}
// build filter
filter_init(fd);
add_default_list(fd, allow_debuggers);
filter_end_blacklist(fd);
// close file
close(fd);
}
// drop list
void seccomp_drop(const char *fname, char *list, int allow_debuggers) {
assert(fname);
(void) allow_debuggers; // todo: to implemnet it
// open file
int fd = open(fname, O_CREAT|O_WRONLY|O_TRUNC, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
if (fd < 0) {
fprintf(stderr, "Error fseccomp: cannot open %s file\n", fname);
exit(1);
}
// build filter
filter_init(fd);
if (syscall_check_list(list, filter_add_blacklist, fd, 0)) {
fprintf(stderr, "Error fseccomp: cannot build seccomp filter\n");
exit(1);
}
filter_end_blacklist(fd);
// close file
close(fd);
}
// default+drop
void seccomp_default_drop(const char *fname, char *list, int allow_debuggers) {
assert(fname);
// open file
int fd = open(fname, O_CREAT|O_WRONLY|O_TRUNC, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
if (fd < 0) {
fprintf(stderr, "Error fseccomp: cannot open %s file\n", fname);
exit(1);
}
// build filter
filter_init(fd);
add_default_list(fd, allow_debuggers);
if (syscall_check_list(list, filter_add_blacklist, fd, 0)) {
fprintf(stderr, "Error fseccomp: cannot build seccomp filter\n");
exit(1);
}
filter_end_blacklist(fd);
// close file
close(fd);
}
void seccomp_keep(const char *fname, char *list) {
// open file
int fd = open(fname, O_CREAT|O_WRONLY|O_TRUNC, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
if (fd < 0) {
fprintf(stderr, "Error fseccomp: cannot open %s file\n", fname);
exit(1);
}
// build filter
filter_init(fd);
// these 4 syscalls are used by firejail after the seccomp filter is initialized
filter_add_whitelist(fd, SYS_setuid, 0);
filter_add_whitelist(fd, SYS_setgid, 0);
filter_add_whitelist(fd, SYS_setgroups, 0);
filter_add_whitelist(fd, SYS_dup, 0);
filter_add_whitelist(fd, SYS_prctl, 0);
if (syscall_check_list(list, filter_add_whitelist, fd, 0)) {
fprintf(stderr, "Error fseccomp: cannot build seccomp filter\n");
exit(1);
}
filter_end_whitelist(fd);
// close file
close(fd);
}
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