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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
b1d4f8e1 LP |
2 | #pragma once |
3 | ||
4 | /*** | |
5 | This file is part of systemd. | |
6 | ||
7 | Copyright 2010 Lennart Poettering | |
8 | ||
9 | systemd is free software; you can redistribute it and/or modify it | |
10 | under the terms of the GNU Lesser General Public License as published by | |
11 | the Free Software Foundation; either version 2.1 of the License, or | |
12 | (at your option) any later version. | |
13 | ||
14 | systemd is distributed in the hope that it will be useful, but | |
15 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | Lesser General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU Lesser General Public License | |
20 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
21 | ***/ | |
22 | ||
b1d4f8e1 | 23 | #include <stdbool.h> |
61755fda | 24 | #include <stdint.h> |
71d35b6b | 25 | #include <sys/types.h> |
ccabee0d | 26 | #include <unistd.h> |
b1d4f8e1 LP |
27 | |
28 | bool uid_is_valid(uid_t uid); | |
29 | ||
30 | static inline bool gid_is_valid(gid_t gid) { | |
31 | return uid_is_valid((uid_t) gid); | |
32 | } | |
33 | ||
34 | int parse_uid(const char *s, uid_t* ret_uid); | |
35 | ||
36 | static inline int parse_gid(const char *s, gid_t *ret_gid) { | |
37 | return parse_uid(s, (uid_t*) ret_gid); | |
38 | } | |
39 | ||
b1d4f8e1 LP |
40 | char* getlogname_malloc(void); |
41 | char* getusername_malloc(void); | |
42 | ||
43 | int get_user_creds(const char **username, uid_t *uid, gid_t *gid, const char **home, const char **shell); | |
be39ccf3 | 44 | int get_user_creds_clean(const char **username, uid_t *uid, gid_t *gid, const char **home, const char **shell); |
b1d4f8e1 LP |
45 | int get_group_creds(const char **groupname, gid_t *gid); |
46 | ||
47 | char* uid_to_name(uid_t uid); | |
48 | char* gid_to_name(gid_t gid); | |
49 | ||
50 | int in_gid(gid_t gid); | |
51 | int in_group(const char *name); | |
52 | ||
53 | int get_home_dir(char **ret); | |
54 | int get_shell(char **_ret); | |
55 | ||
56 | int reset_uid_gid(void); | |
e929bee0 LP |
57 | |
58 | int take_etc_passwd_lock(const char *root); | |
ee104e11 LP |
59 | |
60 | #define UID_INVALID ((uid_t) -1) | |
61 | #define GID_INVALID ((gid_t) -1) | |
62 | ||
61755fda ZJS |
63 | /* Let's pick a UIDs within the 16bit range, so that we are compatible with containers using 16bit |
64 | * user namespacing. At least on Fedora normal users are allocated until UID 60000, hence do not | |
65 | * allocate from below this. Also stay away from the upper end of the range as that is often used | |
66 | * for overflow/nobody users. */ | |
67 | #define DYNAMIC_UID_MIN ((uid_t) UINT32_C(0x0000EF00)) | |
68 | #define DYNAMIC_UID_MAX ((uid_t) UINT32_C(0x0000FFEF)) | |
69 | ||
70 | static inline bool uid_is_dynamic(uid_t uid) { | |
71 | return DYNAMIC_UID_MIN <= uid && uid <= DYNAMIC_UID_MAX; | |
72 | } | |
73 | ||
74 | /* The following macros add 1 when converting things, since UID 0 is a valid UID, while the pointer | |
75 | * NULL is special */ | |
ee104e11 LP |
76 | #define PTR_TO_UID(p) ((uid_t) (((uintptr_t) (p))-1)) |
77 | #define UID_TO_PTR(u) ((void*) (((uintptr_t) (u))+1)) | |
78 | ||
79 | #define PTR_TO_GID(p) ((gid_t) (((uintptr_t) (p))-1)) | |
80 | #define GID_TO_PTR(u) ((void*) (((uintptr_t) (u))+1)) | |
ccabee0d LP |
81 | |
82 | static inline bool userns_supported(void) { | |
83 | return access("/proc/self/uid_map", F_OK) >= 0; | |
84 | } | |
e4631b48 LP |
85 | |
86 | bool valid_user_group_name(const char *u); | |
87 | bool valid_user_group_name_or_id(const char *u); | |
88 | bool valid_gecos(const char *d); | |
89 | bool valid_home(const char *p); | |
36d85478 GS |
90 | |
91 | int maybe_setgroups(size_t size, const gid_t *list); |