469830d142
This substantially reworks the seccomp code, to ensure better compatibility with some architectures, including i386. So far we relied on libseccomp's internal handling of the multiple syscall ABIs supported on Linux. This is problematic however, as it does not define clear semantics if an ABI is not able to support specific seccomp rules we install. This rework hence changes a couple of things: - We no longer use seccomp_rule_add(), but only seccomp_rule_add_exact(), and fail the installation of a filter if the architecture doesn't support it. - We no longer rely on adding multiple syscall architectures to a single filter, but instead install a separate filter for each syscall architecture supported. This way, we can install a strict filter for x86-64, while permitting a less strict filter for i386. - All high-level filter additions are now moved from execute.c to seccomp-util.c, so that we can test them independently of the service execution logic. - Tests have been added for all types of our seccomp filters. - SystemCallFilters= and SystemCallArchitectures= are now implemented in independent filters and installation logic, as they semantically are very much independent of each other. Fixes: #4575
87 lines
2.9 KiB
C
87 lines
2.9 KiB
C
#pragma once
|
|
|
|
/***
|
|
This file is part of systemd.
|
|
|
|
Copyright 2014 Lennart Poettering
|
|
|
|
systemd is free software; you can redistribute it and/or modify it
|
|
under the terms of the GNU Lesser General Public License as published by
|
|
the Free Software Foundation; either version 2.1 of the License, or
|
|
(at your option) any later version.
|
|
|
|
systemd 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
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public License
|
|
along with systemd; If not, see <http://www.gnu.org/licenses/>.
|
|
***/
|
|
|
|
#include <seccomp.h>
|
|
#include <stdbool.h>
|
|
#include <stdint.h>
|
|
|
|
#include "set.h"
|
|
|
|
const char* seccomp_arch_to_string(uint32_t c);
|
|
int seccomp_arch_from_string(const char *n, uint32_t *ret);
|
|
|
|
int seccomp_init_for_arch(scmp_filter_ctx *ret, uint32_t arch, uint32_t default_action);
|
|
|
|
bool is_seccomp_available(void);
|
|
|
|
typedef struct SyscallFilterSet {
|
|
const char *name;
|
|
const char *help;
|
|
const char *value;
|
|
} SyscallFilterSet;
|
|
|
|
enum {
|
|
/* Please leave DEFAULT first, but sort the rest alphabetically */
|
|
SYSCALL_FILTER_SET_DEFAULT,
|
|
SYSCALL_FILTER_SET_BASIC_IO,
|
|
SYSCALL_FILTER_SET_CLOCK,
|
|
SYSCALL_FILTER_SET_CPU_EMULATION,
|
|
SYSCALL_FILTER_SET_DEBUG,
|
|
SYSCALL_FILTER_SET_FILE_SYSTEM,
|
|
SYSCALL_FILTER_SET_IO_EVENT,
|
|
SYSCALL_FILTER_SET_IPC,
|
|
SYSCALL_FILTER_SET_KEYRING,
|
|
SYSCALL_FILTER_SET_MODULE,
|
|
SYSCALL_FILTER_SET_MOUNT,
|
|
SYSCALL_FILTER_SET_NETWORK_IO,
|
|
SYSCALL_FILTER_SET_OBSOLETE,
|
|
SYSCALL_FILTER_SET_PRIVILEGED,
|
|
SYSCALL_FILTER_SET_PROCESS,
|
|
SYSCALL_FILTER_SET_RAW_IO,
|
|
SYSCALL_FILTER_SET_REBOOT,
|
|
SYSCALL_FILTER_SET_RESOURCES,
|
|
SYSCALL_FILTER_SET_SWAP,
|
|
_SYSCALL_FILTER_SET_MAX
|
|
};
|
|
|
|
extern const SyscallFilterSet syscall_filter_sets[];
|
|
|
|
const SyscallFilterSet *syscall_filter_set_find(const char *name);
|
|
|
|
int seccomp_load_syscall_filter_set(uint32_t default_action, const SyscallFilterSet *set, uint32_t action);
|
|
int seccomp_load_syscall_filter_set_raw(uint32_t default_action, Set* set, uint32_t action);
|
|
|
|
int seccomp_restrict_archs(Set *archs);
|
|
int seccomp_restrict_namespaces(unsigned long retain);
|
|
int seccomp_protect_sysctl(void);
|
|
int seccomp_restrict_address_families(Set *address_families, bool whitelist);
|
|
int seccomp_restrict_realtime(void);
|
|
int seccomp_memory_deny_write_execute(void);
|
|
|
|
extern const uint32_t seccomp_local_archs[];
|
|
|
|
#define SECCOMP_FOREACH_LOCAL_ARCH(arch) \
|
|
for (unsigned _i = ({ (arch) = seccomp_local_archs[0]; 0; }); \
|
|
seccomp_local_archs[_i] != (uint32_t) -1; \
|
|
(arch) = seccomp_local_archs[++_i])
|
|
|
|
DEFINE_TRIVIAL_CLEANUP_FUNC(scmp_filter_ctx, seccomp_release);
|