src/basic/capability-util.h

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 #pragma once
   3
   4 /***
   5   This file is part of systemd.
   6
   7   Copyright 2010 Lennart Poettering
   8 ***/
   9
  10 #include <stdbool.h>
  11 #include <stdint.h>
  12 #include <sys/capability.h>
  13 #include <sys/types.h>
  14
  15 #include "macro.h"
  16 #include "util.h"
  17
  18 #define CAP_ALL (uint64_t) -1
  19
  20 unsigned long cap_last_cap(void);
  21 int have_effective_cap(int value);
  22 int capability_bounding_set_drop(uint64_t keep, bool right_now);
  23 int capability_bounding_set_drop_usermode(uint64_t keep);
  24
  25 int capability_ambient_set_apply(uint64_t set, bool also_inherit);
  26 int capability_update_inherited_set(cap_t caps, uint64_t ambient_set);
  27
  28 int drop_privileges(uid_t uid, gid_t gid, uint64_t keep_capabilities);
  29
  30 int drop_capability(cap_value_t cv);
  31
  32 DEFINE_TRIVIAL_CLEANUP_FUNC(cap_t, cap_free);
  33 #define _cleanup_cap_free_ _cleanup_(cap_freep)
  34
  35 static inline void cap_free_charpp(char **p) {
  36         if (*p)
  37                 cap_free(*p);
  38 }
  39 #define _cleanup_cap_free_charp_ _cleanup_(cap_free_charpp)
  40
  41 static inline bool cap_test_all(uint64_t caps) {
  42         uint64_t m;
  43         m = (UINT64_C(1) << (cap_last_cap() + 1)) - 1;
  44         return (caps & m) == m;
  45 }
  46
  47 bool ambient_capabilities_supported(void);