src/shared/seccomp-util.h

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 #pragma once
   3
   4 #include <seccomp.h>
   5 #include <stdbool.h>
   6 #include <stdint.h>
   7
   8 #include "set.h"
   9
  10 const char* seccomp_arch_to_string(uint32_t c);
  11 int seccomp_arch_from_string(const char *n, uint32_t *ret);
  12
  13 int seccomp_init_for_arch(scmp_filter_ctx *ret, uint32_t arch, uint32_t default_action);
  14
  15 bool is_seccomp_available(void);
  16
  17 typedef struct SyscallFilterSet {
  18         const char *name;
  19         const char *help;
  20         const char *value;
  21 } SyscallFilterSet;
  22
  23 enum {
  24         /* Please leave DEFAULT first, but sort the rest alphabetically */
  25         SYSCALL_FILTER_SET_DEFAULT,
  26         SYSCALL_FILTER_SET_AIO,
  27         SYSCALL_FILTER_SET_BASIC_IO,
  28         SYSCALL_FILTER_SET_CHOWN,
  29         SYSCALL_FILTER_SET_CLOCK,
  30         SYSCALL_FILTER_SET_CPU_EMULATION,
  31         SYSCALL_FILTER_SET_DEBUG,
  32         SYSCALL_FILTER_SET_FILE_SYSTEM,
  33         SYSCALL_FILTER_SET_IO_EVENT,
  34         SYSCALL_FILTER_SET_IPC,
  35         SYSCALL_FILTER_SET_KEYRING,
  36         SYSCALL_FILTER_SET_MEMLOCK,
  37         SYSCALL_FILTER_SET_MODULE,
  38         SYSCALL_FILTER_SET_MOUNT,
  39         SYSCALL_FILTER_SET_NETWORK_IO,
  40         SYSCALL_FILTER_SET_OBSOLETE,
  41         SYSCALL_FILTER_SET_PRIVILEGED,
  42         SYSCALL_FILTER_SET_PROCESS,
  43         SYSCALL_FILTER_SET_RAW_IO,
  44         SYSCALL_FILTER_SET_REBOOT,
  45         SYSCALL_FILTER_SET_RESOURCES,
  46         SYSCALL_FILTER_SET_SETUID,
  47         SYSCALL_FILTER_SET_SIGNAL,
  48         SYSCALL_FILTER_SET_SWAP,
  49         SYSCALL_FILTER_SET_SYNC,
  50         SYSCALL_FILTER_SET_SYSTEM_SERVICE,
  51         SYSCALL_FILTER_SET_TIMER,
  52         _SYSCALL_FILTER_SET_MAX
  53 };
  54
  55 extern const SyscallFilterSet syscall_filter_sets[];
  56
  57 const SyscallFilterSet *syscall_filter_set_find(const char *name);
  58
  59 int seccomp_filter_set_add(Hashmap *s, bool b, const SyscallFilterSet *set);
  60
  61 int seccomp_add_syscall_filter_item(scmp_filter_ctx *ctx, const char *name, uint32_t action, char **exclude, bool log_missing);
  62
  63 int seccomp_load_syscall_filter_set(uint32_t default_action, const SyscallFilterSet *set, uint32_t action, bool log_missing);
  64 int seccomp_load_syscall_filter_set_raw(uint32_t default_action, Hashmap* set, uint32_t action, bool log_missing);
  65
  66 typedef enum SeccompParseFlags {
  67         SECCOMP_PARSE_INVERT     = 1 << 0,
  68         SECCOMP_PARSE_WHITELIST  = 1 << 1,
  69         SECCOMP_PARSE_LOG        = 1 << 2,
  70         SECCOMP_PARSE_PERMISSIVE = 1 << 3,
  71 } SeccompParseFlags;
  72
  73 int seccomp_parse_syscall_filter(
  74                 const char *name,
  75                 int errno_num,
  76                 Hashmap *filter,
  77                 SeccompParseFlags flags,
  78                 const char *unit,
  79                 const char *filename, unsigned line);
  80
  81 int seccomp_restrict_archs(Set *archs);
  82 int seccomp_restrict_namespaces(unsigned long retain);
  83 int seccomp_protect_sysctl(void);
  84 int seccomp_restrict_address_families(Set *address_families, bool whitelist);
  85 int seccomp_restrict_realtime(void);
  86 int seccomp_memory_deny_write_execute(void);
  87 int seccomp_lock_personality(unsigned long personality);
  88 int seccomp_protect_hostname(void);
  89 int seccomp_restrict_suid_sgid(void);
  90
  91 extern const uint32_t seccomp_local_archs[];
  92
  93 #define SECCOMP_FOREACH_LOCAL_ARCH(arch) \
  94         for (unsigned _i = ({ (arch) = seccomp_local_archs[0]; 0; });   \
  95              seccomp_local_archs[_i] != (uint32_t) -1;                  \
  96              (arch) = seccomp_local_archs[++_i])
  97
  98 /* EACCES: does not have the CAP_SYS_ADMIN or no_new_privs == 1
  99  * ENOMEM: out of memory, failed to allocate space for a libseccomp structure, or would exceed a defined constant
 100  * EFAULT: addresses passed as args (by libseccomp) are invalid */
 101 #define ERRNO_IS_SECCOMP_FATAL(r)                                       \
 102         IN_SET(abs(r), EPERM, EACCES, ENOMEM, EFAULT)
 103
 104 DEFINE_TRIVIAL_CLEANUP_FUNC(scmp_filter_ctx, seccomp_release);
 105
 106 int parse_syscall_archs(char **l, Set **archs);
 107
 108 uint32_t scmp_act_kill_process(void);