1 /* SPDX-License-Identifier: GPL-2.0 */
2
3 #ifndef __IDMAP_UTILS_H
4 #define __IDMAP_UTILS_H
5
6 #ifndef _GNU_SOURCE
7 #define _GNU_SOURCE
8 #endif
9 #include <errno.h>
10 #include <linux/types.h>
11 #include <sched.h>
12 #include <signal.h>
13 #include <stdbool.h>
14 #include <stdio.h>
15 #include <stdlib.h>
16 #include <string.h>
17 #include <syscall.h>
18 #include <sys/capability.h>
19 #include <sys/fsuid.h>
20 #include <sys/types.h>
21 #include <unistd.h>
22
23 extern int get_userns_fd(unsigned long nsid, unsigned long hostid,
24 unsigned long range);
25
26 extern int caps_down(void);
27 extern int cap_down(cap_value_t down);
28
29 extern bool switch_ids(uid_t uid, gid_t gid);
30 extern int setup_userns(void);
31
switch_userns(int fd,uid_t uid,gid_t gid,bool drop_caps)32 static inline bool switch_userns(int fd, uid_t uid, gid_t gid, bool drop_caps)
33 {
34 if (setns(fd, CLONE_NEWUSER))
35 return false;
36
37 if (!switch_ids(uid, gid))
38 return false;
39
40 if (drop_caps && !caps_down())
41 return false;
42
43 return true;
44 }
45
46 extern uint64_t get_unique_mnt_id(const char *path);
47
48 #endif /* __IDMAP_UTILS_H */
49