mirror of
https://github.com/morgan9e/systemd
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90 lines
3.3 KiB
C
90 lines
3.3 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#pragma once
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#include <sys/capability.h> /* IWYU pragma: export */
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#include "forward.h"
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/* Special marker used when storing a capabilities mask as "unset". This would need to be updated as soon as
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* Linux learns more than 63 caps. */
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#define CAP_MASK_UNSET UINT64_MAX
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assert_cc(CAP_LAST_CAP < 64);
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/* All possible capabilities bits on */
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#define CAP_MASK_ALL UINT64_C(0x7fffffffffffffff)
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/* The largest capability we can deal with, given we want to be able to store cap masks in uint64_t but still
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* be able to use UINT64_MAX as indicator for "not set". The latter makes capability 63 unavailable. */
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#define CAP_LIMIT 62
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static inline bool capability_is_set(uint64_t v) {
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return v != CAP_MASK_UNSET;
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}
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unsigned cap_last_cap(void);
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int have_effective_cap(int value);
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int capability_gain_cap_setpcap(cap_t *ret_before_caps);
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int capability_bounding_set_drop(uint64_t keep, bool right_now);
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int capability_bounding_set_drop_usermode(uint64_t keep);
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int capability_ambient_set_apply(uint64_t set, bool also_inherit);
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int capability_update_inherited_set(cap_t caps, uint64_t ambient_set);
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int drop_privileges(uid_t uid, gid_t gid, uint64_t keep_capabilities);
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int drop_capability(cap_value_t cv);
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int keep_capability(cap_value_t cv);
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DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(cap_t, cap_free, NULL);
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#define _cleanup_cap_free_ _cleanup_(cap_freep)
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static inline uint64_t all_capabilities(void) {
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return UINT64_MAX >> (63 - cap_last_cap());
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}
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static inline bool cap_test_all(uint64_t caps) {
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return FLAGS_SET(caps, all_capabilities());
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}
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/* Identical to linux/capability.h's CAP_TO_MASK(), but uses an unsigned 1U instead of a signed 1 for shifting left, in
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* order to avoid complaints about shifting a signed int left by 31 bits, which would make it negative. */
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#define CAP_TO_MASK_CORRECTED(x) (1U << ((x) & 31U))
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typedef struct CapabilityQuintet {
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/* Stores all five types of capabilities in one go. */
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uint64_t effective;
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uint64_t bounding;
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uint64_t inheritable;
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uint64_t permitted;
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uint64_t ambient;
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} CapabilityQuintet;
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#define CAPABILITY_QUINTET_NULL (const CapabilityQuintet) { CAP_MASK_UNSET, CAP_MASK_UNSET, CAP_MASK_UNSET, CAP_MASK_UNSET, CAP_MASK_UNSET }
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static inline bool capability_quintet_is_set(const CapabilityQuintet *q) {
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return capability_is_set(q->effective) ||
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capability_is_set(q->bounding) ||
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capability_is_set(q->inheritable) ||
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capability_is_set(q->permitted) ||
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capability_is_set(q->ambient);
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}
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static inline bool capability_quintet_is_fully_set(const CapabilityQuintet *q) {
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return capability_is_set(q->effective) &&
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capability_is_set(q->bounding) &&
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capability_is_set(q->inheritable) &&
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capability_is_set(q->permitted) &&
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capability_is_set(q->ambient);
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}
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/* Mangles the specified caps quintet taking the current bounding set into account:
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* drops all caps from all five sets if our bounding set doesn't allow them.
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* Returns true if the quintet was modified. */
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bool capability_quintet_mangle(CapabilityQuintet *q);
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int capability_quintet_enforce(const CapabilityQuintet *q);
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int capability_get_ambient(uint64_t *ret);
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int pidref_get_capability(const PidRef *pidref, CapabilityQuintet *ret);
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