1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
|
/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <sys/mount.h>
#include "btrfs-util.h"
#include "fd-util.h"
#include "homework-directory.h"
#include "homework-quota.h"
#include "mkdir.h"
#include "mount-util.h"
#include "path-util.h"
#include "rm-rf.h"
#include "tmpfile-util.h"
#include "umask-util.h"
int home_prepare_directory(UserRecord *h, bool already_activated, HomeSetup *setup) {
assert(h);
assert(setup);
setup->root_fd = open(user_record_image_path(h), O_RDONLY|O_CLOEXEC|O_DIRECTORY);
if (setup->root_fd < 0)
return log_error_errno(errno, "Failed to open home directory: %m");
return 0;
}
int home_activate_directory(
UserRecord *h,
PasswordCache *cache,
UserRecord **ret_home) {
_cleanup_(user_record_unrefp) UserRecord *new_home = NULL, *header_home = NULL;
_cleanup_(home_setup_undo) HomeSetup setup = HOME_SETUP_INIT;
const char *hdo, *hd, *ipo, *ip;
int r;
assert(h);
assert(IN_SET(user_record_storage(h), USER_DIRECTORY, USER_SUBVOLUME, USER_FSCRYPT));
assert(ret_home);
assert_se(ipo = user_record_image_path(h));
ip = strdupa_safe(ipo); /* copy out, since reconciliation might cause changing of the field */
assert_se(hdo = user_record_home_directory(h));
hd = strdupa_safe(hdo);
r = home_prepare(h, false, cache, &setup, &header_home);
if (r < 0)
return r;
r = home_refresh(h, &setup, header_home, cache, NULL, &new_home);
if (r < 0)
return r;
setup.root_fd = safe_close(setup.root_fd);
/* Create mount point to mount over if necessary */
if (!path_equal(ip, hd))
(void) mkdir_p(hd, 0700);
/* Create a mount point (even if the directory is already placed correctly), as a way to indicate
* this mount point is now "activated". Moreover, we want to set per-user
* MS_NOSUID/MS_NOEXEC/MS_NODEV. */
r = mount_nofollow_verbose(LOG_ERR, ip, hd, NULL, MS_BIND, NULL);
if (r < 0)
return r;
r = mount_nofollow_verbose(LOG_ERR, NULL, hd, NULL, MS_BIND|MS_REMOUNT|user_record_mount_flags(h), NULL);
if (r < 0) {
(void) umount_verbose(LOG_ERR, hd, UMOUNT_NOFOLLOW);
return r;
}
log_info("Everything completed.");
*ret_home = TAKE_PTR(new_home);
return 0;
}
int home_create_directory_or_subvolume(UserRecord *h, UserRecord **ret_home) {
_cleanup_(rm_rf_subvolume_and_freep) char *temporary = NULL;
_cleanup_(user_record_unrefp) UserRecord *new_home = NULL;
_cleanup_close_ int root_fd = -1;
_cleanup_free_ char *d = NULL;
const char *ip;
int r;
assert(h);
assert(IN_SET(user_record_storage(h), USER_DIRECTORY, USER_SUBVOLUME));
assert(ret_home);
assert_se(ip = user_record_image_path(h));
r = tempfn_random(ip, "homework", &d);
if (r < 0)
return log_error_errno(r, "Failed to allocate temporary directory: %m");
(void) mkdir_parents(d, 0755);
switch (user_record_storage(h)) {
case USER_SUBVOLUME:
RUN_WITH_UMASK(0077)
r = btrfs_subvol_make(d);
if (r >= 0) {
log_info("Subvolume created.");
if (h->disk_size != UINT64_MAX) {
/* Enable quota for the subvolume we just created. Note we don't check for
* errors here and only log about debug level about this. */
r = btrfs_quota_enable(d, true);
if (r < 0)
log_debug_errno(r, "Failed to enable quota on %s, ignoring: %m", d);
r = btrfs_subvol_auto_qgroup(d, 0, false);
if (r < 0)
log_debug_errno(r, "Failed to set up automatic quota group on %s, ignoring: %m", d);
/* Actually configure the quota. We also ignore errors here, but we do log
* about them loudly, to keep things discoverable even though we don't
* consider lacking quota support in kernel fatal. */
(void) home_update_quota_btrfs(h, d);
}
break;
}
if (r != -ENOTTY)
return log_error_errno(r, "Failed to create temporary home directory subvolume %s: %m", d);
log_info("Creating subvolume %s is not supported, as file system does not support subvolumes. Falling back to regular directory.", d);
_fallthrough_;
case USER_DIRECTORY:
if (mkdir(d, 0700) < 0)
return log_error_errno(errno, "Failed to create temporary home directory %s: %m", d);
(void) home_update_quota_classic(h, d);
break;
default:
assert_not_reached();
}
temporary = TAKE_PTR(d); /* Needs to be destroyed now */
root_fd = open(temporary, O_RDONLY|O_CLOEXEC|O_DIRECTORY|O_NOFOLLOW);
if (root_fd < 0)
return log_error_errno(errno, "Failed to open temporary home directory: %m");
r = home_populate(h, root_fd);
if (r < 0)
return r;
r = home_sync_and_statfs(root_fd, NULL);
if (r < 0)
return r;
r = user_record_clone(h, USER_RECORD_LOAD_MASK_SECRET|USER_RECORD_PERMISSIVE, &new_home);
if (r < 0)
return log_error_errno(r, "Failed to clone record: %m");
r = user_record_add_binding(
new_home,
user_record_storage(h),
ip,
SD_ID128_NULL,
SD_ID128_NULL,
SD_ID128_NULL,
NULL,
NULL,
UINT64_MAX,
NULL,
NULL,
h->uid,
(gid_t) h->uid);
if (r < 0)
return log_error_errno(r, "Failed to add binding to record: %m");
if (rename(temporary, ip) < 0)
return log_error_errno(errno, "Failed to rename %s to %s: %m", temporary, ip);
temporary = mfree(temporary);
log_info("Everything completed.");
*ret_home = TAKE_PTR(new_home);
return 0;
}
int home_resize_directory(
UserRecord *h,
bool already_activated,
PasswordCache *cache,
HomeSetup *setup,
UserRecord **ret_home) {
_cleanup_(user_record_unrefp) UserRecord *embedded_home = NULL, *new_home = NULL;
int r;
assert(h);
assert(setup);
assert(ret_home);
assert(IN_SET(user_record_storage(h), USER_DIRECTORY, USER_SUBVOLUME, USER_FSCRYPT));
r = home_prepare(h, already_activated, cache, setup, NULL);
if (r < 0)
return r;
r = home_load_embedded_identity(h, setup->root_fd, NULL, USER_RECONCILE_REQUIRE_NEWER_OR_EQUAL, cache, &embedded_home, &new_home);
if (r < 0)
return r;
r = home_update_quota_auto(h, NULL);
if (ERRNO_IS_NOT_SUPPORTED(r))
return -ESOCKTNOSUPPORT; /* make recognizable */
if (r < 0)
return r;
r = home_store_embedded_identity(new_home, setup->root_fd, h->uid, embedded_home);
if (r < 0)
return r;
r = home_extend_embedded_identity(new_home, h, setup);
if (r < 0)
return r;
r = home_sync_and_statfs(setup->root_fd, NULL);
if (r < 0)
return r;
r = home_setup_undo(setup);
if (r < 0)
return r;
log_info("Everything completed.");
*ret_home = TAKE_PTR(new_home);
return 0;
}
|
