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5eda94dd LP |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright 2011 Lennart Poettering | |
5 | ||
6 | systemd is free software; you can redistribute it and/or modify it | |
5430f7f2 LP |
7 | under the terms of the GNU Lesser General Public License as published by |
8 | the Free Software Foundation; either version 2.1 of the License, or | |
5eda94dd LP |
9 | (at your option) any later version. |
10 | ||
11 | systemd is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
5430f7f2 | 14 | Lesser General Public License for more details. |
5eda94dd | 15 | |
5430f7f2 | 16 | You should have received a copy of the GNU Lesser General Public License |
5eda94dd LP |
17 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
18 | ***/ | |
19 | ||
5eda94dd LP |
20 | #include <errno.h> |
21 | #include <string.h> | |
22 | ||
79c07722 | 23 | #include "acl-util.h" |
b5efdb8a | 24 | #include "alloc-util.h" |
a0956174 | 25 | #include "dirent-util.h" |
4f5dd394 | 26 | #include "escape.h" |
3ffd4af2 | 27 | #include "fd-util.h" |
f97b34a6 | 28 | #include "format-util.h" |
3ffd4af2 | 29 | #include "logind-acl.h" |
6b78df0a | 30 | #include "set.h" |
07630cea | 31 | #include "string-util.h" |
bf5332d2 | 32 | #include "udev-util.h" |
4f5dd394 | 33 | #include "util.h" |
5eda94dd LP |
34 | |
35 | static int flush_acl(acl_t acl) { | |
36 | acl_entry_t i; | |
37 | int found; | |
38 | bool changed = false; | |
39 | ||
40 | assert(acl); | |
41 | ||
42 | for (found = acl_get_entry(acl, ACL_FIRST_ENTRY, &i); | |
43 | found > 0; | |
44 | found = acl_get_entry(acl, ACL_NEXT_ENTRY, &i)) { | |
45 | ||
46 | acl_tag_t tag; | |
47 | ||
48 | if (acl_get_tag_type(i, &tag) < 0) | |
49 | return -errno; | |
50 | ||
51 | if (tag != ACL_USER) | |
52 | continue; | |
53 | ||
54 | if (acl_delete_entry(acl, i) < 0) | |
55 | return -errno; | |
56 | ||
57 | changed = true; | |
58 | } | |
59 | ||
60 | if (found < 0) | |
61 | return -errno; | |
62 | ||
63 | return changed; | |
64 | } | |
65 | ||
66 | int devnode_acl(const char *path, | |
67 | bool flush, | |
68 | bool del, uid_t old_uid, | |
69 | bool add, uid_t new_uid) { | |
70 | ||
71 | acl_t acl; | |
501c92c4 | 72 | int r = 0; |
5eda94dd LP |
73 | bool changed = false; |
74 | ||
75 | assert(path); | |
76 | ||
77 | acl = acl_get_file(path, ACL_TYPE_ACCESS); | |
78 | if (!acl) | |
79 | return -errno; | |
80 | ||
81 | if (flush) { | |
82 | ||
83 | r = flush_acl(acl); | |
84 | if (r < 0) | |
85 | goto finish; | |
86 | if (r > 0) | |
87 | changed = true; | |
88 | ||
89 | } else if (del && old_uid > 0) { | |
90 | acl_entry_t entry; | |
91 | ||
f4b47811 | 92 | r = acl_find_uid(acl, old_uid, &entry); |
5eda94dd LP |
93 | if (r < 0) |
94 | goto finish; | |
95 | ||
96 | if (r > 0) { | |
97 | if (acl_delete_entry(acl, entry) < 0) { | |
98 | r = -errno; | |
99 | goto finish; | |
100 | } | |
101 | ||
102 | changed = true; | |
103 | } | |
104 | } | |
105 | ||
106 | if (add && new_uid > 0) { | |
107 | acl_entry_t entry; | |
108 | acl_permset_t permset; | |
109 | int rd, wt; | |
110 | ||
f4b47811 | 111 | r = acl_find_uid(acl, new_uid, &entry); |
5eda94dd LP |
112 | if (r < 0) |
113 | goto finish; | |
114 | ||
115 | if (r == 0) { | |
116 | if (acl_create_entry(&acl, &entry) < 0) { | |
117 | r = -errno; | |
118 | goto finish; | |
119 | } | |
120 | ||
121 | if (acl_set_tag_type(entry, ACL_USER) < 0 || | |
122 | acl_set_qualifier(entry, &new_uid) < 0) { | |
123 | r = -errno; | |
124 | goto finish; | |
125 | } | |
126 | } | |
127 | ||
128 | if (acl_get_permset(entry, &permset) < 0) { | |
129 | r = -errno; | |
130 | goto finish; | |
131 | } | |
132 | ||
133 | rd = acl_get_perm(permset, ACL_READ); | |
134 | if (rd < 0) { | |
135 | r = -errno; | |
136 | goto finish; | |
137 | } | |
138 | ||
139 | wt = acl_get_perm(permset, ACL_WRITE); | |
140 | if (wt < 0) { | |
141 | r = -errno; | |
142 | goto finish; | |
143 | } | |
144 | ||
145 | if (!rd || !wt) { | |
146 | ||
147 | if (acl_add_perm(permset, ACL_READ|ACL_WRITE) < 0) { | |
148 | r = -errno; | |
149 | goto finish; | |
150 | } | |
151 | ||
152 | changed = true; | |
153 | } | |
154 | } | |
155 | ||
156 | if (!changed) | |
157 | goto finish; | |
158 | ||
159 | if (acl_calc_mask(&acl) < 0) { | |
160 | r = -errno; | |
161 | goto finish; | |
162 | } | |
163 | ||
164 | if (acl_set_file(path, ACL_TYPE_ACCESS, acl) < 0) { | |
165 | r = -errno; | |
166 | goto finish; | |
167 | } | |
168 | ||
169 | r = 0; | |
170 | ||
171 | finish: | |
172 | acl_free(acl); | |
173 | ||
174 | return r; | |
175 | } | |
176 | ||
177 | int devnode_acl_all(struct udev *udev, | |
178 | const char *seat, | |
179 | bool flush, | |
180 | bool del, uid_t old_uid, | |
181 | bool add, uid_t new_uid) { | |
182 | ||
bf5332d2 | 183 | _cleanup_udev_enumerate_unref_ struct udev_enumerate *e = NULL; |
5eda94dd | 184 | struct udev_list_entry *item = NULL, *first = NULL; |
bf5332d2 | 185 | _cleanup_set_free_free_ Set *nodes = NULL; |
db0c1e3b | 186 | _cleanup_closedir_ DIR *dir = NULL; |
6b78df0a | 187 | struct dirent *dent; |
bf5332d2 LP |
188 | Iterator i; |
189 | char *n; | |
5eda94dd LP |
190 | int r; |
191 | ||
192 | assert(udev); | |
193 | ||
d5099efc | 194 | nodes = set_new(&string_hash_ops); |
cc377381 | 195 | if (!nodes) |
6b78df0a | 196 | return -ENOMEM; |
5eda94dd LP |
197 | |
198 | e = udev_enumerate_new(udev); | |
bf5332d2 LP |
199 | if (!e) |
200 | return -ENOMEM; | |
6b78df0a TG |
201 | |
202 | if (isempty(seat)) | |
203 | seat = "seat0"; | |
5eda94dd | 204 | |
7b3afbac LP |
205 | /* We can only match by one tag in libudev. We choose |
206 | * "uaccess" for that. If we could match for two tags here we | |
207 | * could add the seat name as second match tag, but this would | |
208 | * be hardly optimizable in libudev, and hence checking the | |
209 | * second tag manually in our loop is a good solution. */ | |
5eda94dd LP |
210 | r = udev_enumerate_add_match_tag(e, "uaccess"); |
211 | if (r < 0) | |
bf5332d2 | 212 | return r; |
5eda94dd | 213 | |
e1202047 LP |
214 | r = udev_enumerate_add_match_is_initialized(e); |
215 | if (r < 0) | |
216 | return r; | |
217 | ||
5eda94dd LP |
218 | r = udev_enumerate_scan_devices(e); |
219 | if (r < 0) | |
bf5332d2 | 220 | return r; |
5eda94dd LP |
221 | |
222 | first = udev_enumerate_get_list_entry(e); | |
223 | udev_list_entry_foreach(item, first) { | |
bf5332d2 | 224 | _cleanup_udev_device_unref_ struct udev_device *d = NULL; |
5eda94dd LP |
225 | const char *node, *sn; |
226 | ||
227 | d = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item)); | |
bf5332d2 LP |
228 | if (!d) |
229 | return -ENOMEM; | |
230 | ||
53907215 LP |
231 | sn = udev_device_get_property_value(d, "ID_SEAT"); |
232 | if (isempty(sn)) | |
5eda94dd LP |
233 | sn = "seat0"; |
234 | ||
bf5332d2 | 235 | if (!streq(seat, sn)) |
5eda94dd | 236 | continue; |
5eda94dd LP |
237 | |
238 | node = udev_device_get_devnode(d); | |
bf5332d2 LP |
239 | /* In case people mistag devices with nodes, we need to ignore this */ |
240 | if (!node) | |
d2d4b038 | 241 | continue; |
5eda94dd | 242 | |
6b78df0a | 243 | n = strdup(node); |
6b78df0a | 244 | if (!n) |
bf5332d2 | 245 | return -ENOMEM; |
ce0f7c97 | 246 | |
6b78df0a | 247 | log_debug("Found udev node %s for seat %s", n, seat); |
bf5332d2 | 248 | r = set_consume(nodes, n); |
5eda94dd | 249 | if (r < 0) |
bf5332d2 | 250 | return r; |
5eda94dd LP |
251 | } |
252 | ||
6b78df0a TG |
253 | /* udev exports "dead" device nodes to allow module on-demand loading, |
254 | * these devices are not known to the kernel at this moment */ | |
255 | dir = opendir("/run/udev/static_node-tags/uaccess"); | |
256 | if (dir) { | |
bf5332d2 | 257 | FOREACH_DIRENT(dent, dir, return -errno) { |
6b78df0a | 258 | _cleanup_free_ char *unescaped_devname = NULL; |
5eda94dd | 259 | |
527b7a42 | 260 | if (cunescape(dent->d_name, UNESCAPE_RELAX, &unescaped_devname) < 0) |
bf5332d2 | 261 | return -ENOMEM; |
6b78df0a TG |
262 | |
263 | n = strappend("/dev/", unescaped_devname); | |
bf5332d2 LP |
264 | if (!n) |
265 | return -ENOMEM; | |
6b78df0a TG |
266 | |
267 | log_debug("Found static node %s for seat %s", n, seat); | |
bf5332d2 LP |
268 | r = set_consume(nodes, n); |
269 | if (r == -EEXIST) | |
270 | continue; | |
271 | if (r < 0) | |
272 | return r; | |
6b78df0a | 273 | } |
6b78df0a TG |
274 | } |
275 | ||
bf5332d2 | 276 | r = 0; |
6b78df0a | 277 | SET_FOREACH(n, nodes, i) { |
bf5332d2 LP |
278 | int k; |
279 | ||
6b9732b2 ZJS |
280 | log_debug("Changing ACLs at %s for seat %s (uid "UID_FMT"→"UID_FMT"%s%s)", |
281 | n, seat, old_uid, new_uid, | |
282 | del ? " del" : "", add ? " add" : ""); | |
283 | ||
bf5332d2 | 284 | k = devnode_acl(n, flush, del, old_uid, add, new_uid); |
8016b904 DH |
285 | if (k == -ENOENT) |
286 | log_debug("Device %s disappeared while setting ACLs", n); | |
f7a5bb28 | 287 | else if (k < 0 && r == 0) |
bf5332d2 | 288 | r = k; |
6b78df0a TG |
289 | } |
290 | ||
5eda94dd LP |
291 | return r; |
292 | } |