src/shared/seccomp-util.h

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