src/shared/seccomp-util.h

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 #pragma once
   3
   4 /***
   5   This file is part of systemd.
   6
   7   Copyright 2014 Lennart Poettering
   8 ***/
   9
  10 #include <seccomp.h>
  11 #include <stdbool.h>
  12 #include <stdint.h>
  13
  14 #include "set.h"
  15
  16 const char* seccomp_arch_to_string(uint32_t c);
  17 int seccomp_arch_from_string(const char *n, uint32_t *ret);
  18
  19 int seccomp_init_for_arch(scmp_filter_ctx *ret, uint32_t arch, uint32_t default_action);
  20
  21 bool is_seccomp_available(void);
  22
  23 typedef struct SyscallFilterSet {
  24         const char *name;
  25         const char *help;
  26         const char *value;
  27 } SyscallFilterSet;
  28
  29 enum {
  30         /* Please leave DEFAULT first, but sort the rest alphabetically */
  31         SYSCALL_FILTER_SET_DEFAULT,
  32         SYSCALL_FILTER_SET_AIO,
  33         SYSCALL_FILTER_SET_BASIC_IO,
  34         SYSCALL_FILTER_SET_CHOWN,
  35         SYSCALL_FILTER_SET_CLOCK,
  36         SYSCALL_FILTER_SET_CPU_EMULATION,
  37         SYSCALL_FILTER_SET_DEBUG,
  38         SYSCALL_FILTER_SET_FILE_SYSTEM,
  39         SYSCALL_FILTER_SET_IO_EVENT,
  40         SYSCALL_FILTER_SET_IPC,
  41         SYSCALL_FILTER_SET_KEYRING,
  42         SYSCALL_FILTER_SET_MEMLOCK,
  43         SYSCALL_FILTER_SET_MODULE,
  44         SYSCALL_FILTER_SET_MOUNT,
  45         SYSCALL_FILTER_SET_NETWORK_IO,
  46         SYSCALL_FILTER_SET_OBSOLETE,
  47         SYSCALL_FILTER_SET_PRIVILEGED,
  48         SYSCALL_FILTER_SET_PROCESS,
  49         SYSCALL_FILTER_SET_RAW_IO,
  50         SYSCALL_FILTER_SET_REBOOT,
  51         SYSCALL_FILTER_SET_RESOURCES,
  52         SYSCALL_FILTER_SET_SETUID,
  53         SYSCALL_FILTER_SET_SIGNAL,
  54         SYSCALL_FILTER_SET_SWAP,
  55         SYSCALL_FILTER_SET_SYNC,
  56         SYSCALL_FILTER_SET_TIMER,
  57         _SYSCALL_FILTER_SET_MAX
  58 };
  59
  60 extern const SyscallFilterSet syscall_filter_sets[];
  61
  62 const SyscallFilterSet *syscall_filter_set_find(const char *name);
  63
  64 int seccomp_filter_set_add(Hashmap *s, bool b, const SyscallFilterSet *set);
  65
  66 int seccomp_add_syscall_filter_item(scmp_filter_ctx *ctx, const char *name, uint32_t action, char **exclude);
  67
  68 int seccomp_load_syscall_filter_set(uint32_t default_action, const SyscallFilterSet *set, uint32_t action);
  69 int seccomp_load_syscall_filter_set_raw(uint32_t default_action, Hashmap* set, uint32_t action);
  70
  71 typedef enum SeccompParseFlags {
  72         SECCOMP_PARSE_INVERT     = 1 << 0,
  73         SECCOMP_PARSE_WHITELIST  = 1 << 1,
  74         SECCOMP_PARSE_LOG        = 1 << 2,
  75         SECCOMP_PARSE_PERMISSIVE = 1 << 3,
  76 } SeccompParseFlags;
  77
  78 int seccomp_parse_syscall_filter_full(
  79                 const char *name, int errno_num, Hashmap *filter, SeccompParseFlags flags,
  80                 const char *unit, const char *filename, unsigned line);
  81
  82 static inline int seccomp_parse_syscall_filter(const char *name, int errno_num, Hashmap *filter, SeccompParseFlags flags) {
  83         return seccomp_parse_syscall_filter_full(name, errno_num, filter, flags, NULL, NULL, 0);
  84 }
  85
  86 int seccomp_restrict_archs(Set *archs);
  87 int seccomp_restrict_namespaces(unsigned long retain);
  88 int seccomp_protect_sysctl(void);
  89 int seccomp_restrict_address_families(Set *address_families, bool whitelist);
  90 int seccomp_restrict_realtime(void);
  91 int seccomp_memory_deny_write_execute(void);
  92 int seccomp_lock_personality(unsigned long personality);
  93
  94 extern const uint32_t seccomp_local_archs[];
  95
  96 #define SECCOMP_FOREACH_LOCAL_ARCH(arch) \
  97         for (unsigned _i = ({ (arch) = seccomp_local_archs[0]; 0; });   \
  98              seccomp_local_archs[_i] != (uint32_t) -1;                  \
  99              (arch) = seccomp_local_archs[++_i])
 100
 101 DEFINE_TRIVIAL_CLEANUP_FUNC(scmp_filter_ctx, seccomp_release);
 102
 103 int parse_syscall_archs(char **l, Set **archs);