src/basic/capability-util.h

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 #pragma once
   3
   4 #include <stdbool.h>
   5 #include <stdint.h>
   6 #include <sys/capability.h>
   7 #include <sys/types.h>
   8
   9 #include "macro.h"
  10 #include "util.h"
  11
  12 #define CAP_ALL (uint64_t) -1
  13
  14 unsigned long cap_last_cap(void);
  15 int have_effective_cap(int value);
  16 int capability_bounding_set_drop(uint64_t keep, bool right_now);
  17 int capability_bounding_set_drop_usermode(uint64_t keep);
  18
  19 int capability_ambient_set_apply(uint64_t set, bool also_inherit);
  20 int capability_update_inherited_set(cap_t caps, uint64_t ambient_set);
  21
  22 int drop_privileges(uid_t uid, gid_t gid, uint64_t keep_capabilities);
  23
  24 int drop_capability(cap_value_t cv);
  25
  26 DEFINE_TRIVIAL_CLEANUP_FUNC(cap_t, cap_free);
  27 #define _cleanup_cap_free_ _cleanup_(cap_freep)
  28
  29 static inline void cap_free_charpp(char **p) {
  30         if (*p)
  31                 cap_free(*p);
  32 }
  33 #define _cleanup_cap_free_charp_ _cleanup_(cap_free_charpp)
  34
  35 static inline bool cap_test_all(uint64_t caps) {
  36         uint64_t m;
  37         m = (UINT64_C(1) << (cap_last_cap() + 1)) - 1;
  38         return FLAGS_SET(caps, m);
  39 }
  40
  41 bool ambient_capabilities_supported(void);
  42
  43 /* Identical to linux/capability.h's CAP_TO_MASK(), but uses an unsigned 1U instead of a signed 1 for shifting left, in
  44  * order to avoid complaints about shifting a signed int left by 31 bits, which would make it negative. */
  45 #define CAP_TO_MASK_CORRECTED(x) (1U << ((x) & 31U))