mirror of
https://github.com/morgan9e/systemd
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554130faf3
In multi-seat scenarios, a display manager might need to start multiple greeter sessions. But systemd allows at most one graphical session per user. So, display managers now have a range of UIDs to dynamically allocate users for their greeter sessions.
60 lines
1.8 KiB
C
60 lines
1.8 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#pragma once
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#include "forward.h"
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/* The container base should have the last 16 bit set to zero */
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assert_cc((CONTAINER_UID_BASE_MIN & 0xFFFFU) == 0);
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assert_cc((CONTAINER_UID_BASE_MAX & 0xFFFFU) == 0);
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/* Given we assign 64K UIDs to containers, the last container UID is 0xFFFF larger than the base */
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#define CONTAINER_UID_MIN (CONTAINER_UID_BASE_MIN)
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#define CONTAINER_UID_MAX (CONTAINER_UID_BASE_MAX + 0xFFFFU)
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assert_cc((FOREIGN_UID_BASE & 0xFFFFU) == 0);
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#define FOREIGN_UID_MIN (FOREIGN_UID_BASE)
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#define FOREIGN_UID_MAX (FOREIGN_UID_BASE + 0xFFFFU)
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bool uid_is_system(uid_t uid);
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bool gid_is_system(gid_t gid);
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static inline bool uid_is_greeter(uid_t uid) {
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return GREETER_UID_MIN <= uid && uid <= GREETER_UID_MAX;
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}
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static inline bool uid_is_dynamic(uid_t uid) {
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return DYNAMIC_UID_MIN <= uid && uid <= DYNAMIC_UID_MAX;
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}
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static inline bool gid_is_dynamic(gid_t gid) {
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return uid_is_dynamic((uid_t) gid);
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}
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static inline bool uid_is_container(uid_t uid) {
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return CONTAINER_UID_MIN <= uid && uid <= CONTAINER_UID_MAX;
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}
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static inline bool gid_is_container(gid_t gid) {
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return uid_is_container((uid_t) gid);
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}
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static inline bool uid_is_foreign(uid_t uid) {
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return FOREIGN_UID_MIN <= uid && uid <= FOREIGN_UID_MAX;
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}
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static inline bool gid_is_foreign(gid_t gid) {
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return uid_is_foreign((uid_t) gid);
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}
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typedef struct UGIDAllocationRange {
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uid_t system_alloc_uid_min;
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uid_t system_uid_max;
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gid_t system_alloc_gid_min;
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gid_t system_gid_max;
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} UGIDAllocationRange;
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int read_login_defs(UGIDAllocationRange *ret_defs, const char *path, const char *root);
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const UGIDAllocationRange *acquire_ugid_allocation_range(void);
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bool uid_for_system_journal(uid_t uid);
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