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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 <sys/syscall.h>
typedef struct {
const char * const name;
int nr;
} SyscallEntry;
typedef struct {
const char * const name;
const char * const list;
} SyscallGroupList;
static const SyscallEntry syslist[] = {
//
// code generated using tools/extract-syscall
//
#include "../include/syscall.h"
//
// end of generated code
//
}; // end of syslist
static const SyscallGroupList sysgroups[] = {
{ .name = "@clock", .list =
#ifdef SYS_adjtimex
"adjtimex,"
#endif
#ifdef SYS_clock_adjtime
"clock_adjtime,"
#endif
#ifdef SYS_clock_settime
"clock_settime,"
#endif
#ifdef SYS_settimeofday
"settimeofday,"
#endif
#ifdef SYS_stime
"stime"
#endif
},
{ .name = "@cpu-emulation", .list =
#ifdef SYS_modify_ldt
"modify_ldt,"
#endif
#ifdef SYS_subpage_prot
"subpage_prot,"
#endif
#ifdef SYS_switch_endian
"switch_endian,"
#endif
#ifdef SYS_vm86
"vm86,"
#endif
#ifdef SYS_vm86old
"vm86old"
#endif
},
{ .name = "@debug", .list =
#ifdef SYS_lookup_dcookie
"lookup_dcookie,"
#endif
#ifdef SYS_perf_event_open
"perf_event_open,"
#endif
#ifdef SYS_process_vm_writev
"process_vm_writev,"
#endif
#ifdef SYS_rtas
"rtas,"
#endif
#ifdef SYS_s390_runtime_instr
"s390_runtime_instr,"
#endif
#ifdef SYS_sys_debug_setcontext
"sys_debug_setcontext,"
#endif
},
{ .name = "@default", .list =
"@cpu-emulation,"
"@debug,"
"@module,"
"@obsolete,"
"@privileged,"
"@resources,"
#ifdef SYS_open_by_handle_at
"open_by_handle_at,"
#endif
#ifdef SYS_name_to_handle_at
"name_to_handle_at,"
#endif
#ifdef SYS_ioprio_set
"ioprio_set,"
#endif
#ifdef SYS_ni_syscall
"ni_syscall,"
#endif
#ifdef SYS_syslog
"syslog,"
#endif
#ifdef SYS_fanotify_init
"fanotify_init,"
#endif
#ifdef SYS_kcmp
"kcmp,"
#endif
#ifdef SYS_add_key
"add_key,"
#endif
#ifdef SYS_request_key
"request_key,"
#endif
#ifdef SYS_keyctl
"keyctl,"
#endif
#ifdef SYS_io_setup
"io_setup,"
#endif
#ifdef SYS_io_destroy
"io_destroy,"
#endif
#ifdef SYS_io_getevents
"io_getevents,"
#endif
#ifdef SYS_io_submit
"io_submit,"
#endif
#ifdef SYS_io_cancel
"io_cancel,"
#endif
#ifdef SYS_remap_file_pages
"remap_file_pages,"
#endif
#ifdef SYS_vmsplice
"vmsplice,"
#endif
#ifdef SYS_personality
"personality,"
#endif
#ifdef SYS_umount
"umount,"
#endif
#ifdef SYS_userfaultfd
"userfaultfd"
#endif
},
{ .name = "@default-nodebuggers", .list =
"@default,"
#ifdef SYS_ptrace
"ptrace,"
#endif
#ifdef SYS_process_vm_readv
"process_vm_readv"
#endif
},
{ .name = "@default-keep", .list =
"dup,"
"prctl,"
"setgid,"
"setgroups,"
"setuid"
},
{ .name = "@module", .list =
#ifdef SYS_delete_module
"delete_module,"
#endif
#ifdef SYS_finit_module
"finit_module,"
#endif
#ifdef SYS_init_module
"init_module"
#endif
},
{ .name = "@obsolete", .list =
#ifdef SYS__sysctl
"_sysctl,"
#endif
#ifdef SYS_afs_syscall
"afs_syscall,"
#endif
#ifdef SYS_bdflush
"bdflush,"
#endif
#ifdef SYS_break
"break,"
#endif
#ifdef SYS_create_module
"create_module,"
#endif
#ifdef SYS_ftime
"ftime,"
#endif
#ifdef SYS_get_kernel_syms
"get_kernel_syms,"
#endif
#ifdef SYS_getpmsg
"getpmsg,"
#endif
#ifdef SYS_gtty
"gtty,"
#endif
#ifdef SYS_lock
"lock,"
#endif
#ifdef SYS_mpx
"mpx,"
#endif
#ifdef SYS_prof
"prof,"
#endif
#ifdef SYS_profil
"profil,"
#endif
#ifdef SYS_putpmsg
"putpmsg,"
#endif
#ifdef SYS_query_module
"query_module,"
#endif
#ifdef SYS_security
"security,"
#endif
#ifdef SYS_sgetmask
"sgetmask,"
#endif
#ifdef SYS_ssetmask
"ssetmask,"
#endif
#ifdef SYS_stty
"stty,"
#endif
#ifdef SYS_sysfs
"sysfs,"
#endif
#ifdef SYS_tuxcall
"tuxcall,"
#endif
#ifdef SYS_ulimit
"ulimit,"
#endif
#ifdef SYS_uselib
"uselib,"
#endif
#ifdef SYS_ustat
"ustat,"
#endif
#ifdef SYS_vserver
"vserver"
#endif
},
{ .name = "@privileged", .list =
"@clock,"
"@module,"
"@raw-io,"
"@reboot,"
"@swap,"
#ifdef SYS_acct
"acct,"
#endif
#ifdef SYS_bpf
"bpf,"
#endif
#ifdef SYS_chroot
"chroot,"
#endif
#ifdef SYS_mount
"mount,"
#endif
#ifdef SYS_nfsservctl
"nfsservctl,"
#endif
#ifdef SYS_pivot_root
"pivot_root,"
#endif
#ifdef SYS_setdomainname
"setdomainname,"
#endif
#ifdef SYS_sethostname
"sethostname,"
#endif
#ifdef SYS_umount2
"umount2,"
#endif
#ifdef SYS_vhangup
"vhangup"
#endif
},
{ .name = "@raw-io", .list =
#ifdef SYS_ioperm
"ioperm,"
#endif
#ifdef SYS_iopl
"iopl,"
#endif
#ifdef SYS_pciconfig_iobase
"pciconfig_iobase,"
#endif
#ifdef SYS_pciconfig_read
"pciconfig_read,"
#endif
#ifdef SYS_pciconfig_write
"pciconfig_write,"
#endif
#ifdef SYS_s390_mmio_read
"s390_mmio_read,"
#endif
#ifdef SYS_s390_mmio_write
"s390_mmio_write"
#endif
},
{ .name = "@reboot", .list =
#ifdef SYS_kexec_load
"kexec_load,"
#endif
#ifdef SYS_kexec_file_load
"kexec_file_load,"
#endif
#ifdef SYS_reboot
"reboot,"
#endif
},
{ .name = "@resources", .list =
#ifdef SYS_set_mempolicy
"set_mempolicy,"
#endif
#ifdef SYS_migrate_pages
"migrate_pages,"
#endif
#ifdef SYS_move_pages
"move_pages,"
#endif
#ifdef SYS_mbind
"mbind"
#endif
},
{ .name = "@swap", .list =
#ifdef SYS_swapon
"swapon,"
#endif
#ifdef SYS_swapoff
"swapoff"
#endif
}
};
// return -1 if error, or syscall number
static int syscall_find_name(const char *name) {
int i;
int elems = sizeof(syslist) / sizeof(syslist[0]);
for (i = 0; i < elems; i++) {
if (strcmp(name, syslist[i].name) == 0)
return syslist[i].nr;
}
return -1;
}
const char *syscall_find_nr(int nr) {
int i;
int elems = sizeof(syslist) / sizeof(syslist[0]);
for (i = 0; i < elems; i++) {
if (nr == syslist[i].nr)
return syslist[i].name;
}
return "unknown";
}
void syscall_print(void) {
int i;
int elems = sizeof(syslist) / sizeof(syslist[0]);
for (i = 0; i < elems; i++) {
printf("%d\t- %s\n", syslist[i].nr, syslist[i].name);
}
printf("\n");
}
static const char *syscall_find_group(const char *name) {
int i;
int elems = sizeof(sysgroups) / sizeof(sysgroups[0]);
for (i = 0; i < elems; i++) {
if (strcmp(name, sysgroups[i].name) == 0)
return sysgroups[i].list;
}
return NULL;
}
// allowed input:
// - syscall
// - syscall(error)
static void syscall_process_name(const char *name, int *syscall_nr, int *error_nr) {
assert(name);
if (strlen(name) == 0)
goto error;
*error_nr = -1;
// syntax check
char *str = strdup(name);
if (!str)
errExit("strdup");
char *syscall_name = str;
char *error_name = strchr(str, ':');
if (error_name) {
*error_name = '\0';
error_name++;
}
if (strlen(syscall_name) == 0) {
free(str);
goto error;
}
if (*syscall_name == '$')
*syscall_nr = strtol(syscall_name + 1, NULL, 0);
else
*syscall_nr = syscall_find_name(syscall_name);
if (error_name) {
*error_nr = errno_find_name(error_name);
if (*error_nr == -1)
*syscall_nr = -1;
}
free(str);
return;
error:
fprintf(stderr, "Error fseccomp: invalid syscall list entry %s\n", name);
exit(1);
}
// return 1 if error, 0 if OK
int syscall_check_list(const char *slist, void (*callback)(int fd, int syscall, int arg), int fd, int arg) {
// don't allow empty lists
if (slist == NULL || *slist == '\0') {
fprintf(stderr, "Error fseccomp: empty syscall lists are not allowed\n");
exit(1);
}
// work on a copy of the string
char *str = strdup(slist);
if (!str)
errExit("strdup");
char *saveptr;
char *ptr = strtok_r(str, ",", &saveptr);
if (ptr == NULL) {
fprintf(stderr, "Error fseccomp: empty syscall lists are not allowed\n");
exit(1);
}
while (ptr) {
int syscall_nr;
int error_nr;
if (*ptr == '@') {
const char *new_list = syscall_find_group(ptr);
if (!new_list) {
fprintf(stderr, "Error fseccomp: unknown syscall group %s\n", ptr);
exit(1);
}
syscall_check_list(new_list, callback, fd, arg);
}
else {
syscall_process_name(ptr, &syscall_nr, &error_nr);
if (syscall_nr == -1) {
if (!arg_quiet)
fprintf(stderr, "Warning fseccomp: syscall \"%s\" not available on this platform\n", ptr);
}
else if (callback != NULL) {
if (error_nr != -1)
filter_add_errno(fd, syscall_nr, error_nr);
else
callback(fd, syscall_nr, arg);
}
}
ptr = strtok_r(NULL, ",", &saveptr);
}
free(str);
return 0;
}
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