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1 | /* SPDX-License-Identifier: LGPL-2.1+ */ | |
2 | /*** | |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright 2011 Lennart Poettering | |
6 | ||
7 | systemd is free software; you can redistribute it and/or modify it | |
8 | under the terms of the GNU Lesser General Public License as published by | |
9 | the Free Software Foundation; either version 2.1 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | systemd is distributed in the hope that it will be useful, but | |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | Lesser General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU Lesser General Public License | |
18 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
19 | ***/ | |
20 | ||
21 | #include <errno.h> | |
22 | #include <string.h> | |
23 | ||
24 | #include "alloc-util.h" | |
25 | #include "bus-util.h" | |
26 | #include "format-util.h" | |
27 | #include "logind-user.h" | |
28 | #include "logind.h" | |
29 | #include "signal-util.h" | |
30 | #include "strv.h" | |
31 | #include "user-util.h" | |
32 | ||
33 | static int property_get_display( | |
34 | sd_bus *bus, | |
35 | const char *path, | |
36 | const char *interface, | |
37 | const char *property, | |
38 | sd_bus_message *reply, | |
39 | void *userdata, | |
40 | sd_bus_error *error) { | |
41 | ||
42 | _cleanup_free_ char *p = NULL; | |
43 | User *u = userdata; | |
44 | ||
45 | assert(bus); | |
46 | assert(reply); | |
47 | assert(u); | |
48 | ||
49 | p = u->display ? session_bus_path(u->display) : strdup("/"); | |
50 | if (!p) | |
51 | return -ENOMEM; | |
52 | ||
53 | return sd_bus_message_append(reply, "(so)", u->display ? u->display->id : "", p); | |
54 | } | |
55 | ||
56 | static int property_get_state( | |
57 | sd_bus *bus, | |
58 | const char *path, | |
59 | const char *interface, | |
60 | const char *property, | |
61 | sd_bus_message *reply, | |
62 | void *userdata, | |
63 | sd_bus_error *error) { | |
64 | ||
65 | User *u = userdata; | |
66 | ||
67 | assert(bus); | |
68 | assert(reply); | |
69 | assert(u); | |
70 | ||
71 | return sd_bus_message_append(reply, "s", user_state_to_string(user_get_state(u))); | |
72 | } | |
73 | ||
74 | static int property_get_sessions( | |
75 | sd_bus *bus, | |
76 | const char *path, | |
77 | const char *interface, | |
78 | const char *property, | |
79 | sd_bus_message *reply, | |
80 | void *userdata, | |
81 | sd_bus_error *error) { | |
82 | ||
83 | User *u = userdata; | |
84 | Session *session; | |
85 | int r; | |
86 | ||
87 | assert(bus); | |
88 | assert(reply); | |
89 | assert(u); | |
90 | ||
91 | r = sd_bus_message_open_container(reply, 'a', "(so)"); | |
92 | if (r < 0) | |
93 | return r; | |
94 | ||
95 | LIST_FOREACH(sessions_by_user, session, u->sessions) { | |
96 | _cleanup_free_ char *p = NULL; | |
97 | ||
98 | p = session_bus_path(session); | |
99 | if (!p) | |
100 | return -ENOMEM; | |
101 | ||
102 | r = sd_bus_message_append(reply, "(so)", session->id, p); | |
103 | if (r < 0) | |
104 | return r; | |
105 | ||
106 | } | |
107 | ||
108 | return sd_bus_message_close_container(reply); | |
109 | } | |
110 | ||
111 | static int property_get_idle_hint( | |
112 | sd_bus *bus, | |
113 | const char *path, | |
114 | const char *interface, | |
115 | const char *property, | |
116 | sd_bus_message *reply, | |
117 | void *userdata, | |
118 | sd_bus_error *error) { | |
119 | ||
120 | User *u = userdata; | |
121 | ||
122 | assert(bus); | |
123 | assert(reply); | |
124 | assert(u); | |
125 | ||
126 | return sd_bus_message_append(reply, "b", user_get_idle_hint(u, NULL) > 0); | |
127 | } | |
128 | ||
129 | static int property_get_idle_since_hint( | |
130 | sd_bus *bus, | |
131 | const char *path, | |
132 | const char *interface, | |
133 | const char *property, | |
134 | sd_bus_message *reply, | |
135 | void *userdata, | |
136 | sd_bus_error *error) { | |
137 | ||
138 | User *u = userdata; | |
139 | dual_timestamp t = DUAL_TIMESTAMP_NULL; | |
140 | uint64_t k; | |
141 | ||
142 | assert(bus); | |
143 | assert(reply); | |
144 | assert(u); | |
145 | ||
146 | user_get_idle_hint(u, &t); | |
147 | k = streq(property, "IdleSinceHint") ? t.realtime : t.monotonic; | |
148 | ||
149 | return sd_bus_message_append(reply, "t", k); | |
150 | } | |
151 | ||
152 | static int property_get_linger( | |
153 | sd_bus *bus, | |
154 | const char *path, | |
155 | const char *interface, | |
156 | const char *property, | |
157 | sd_bus_message *reply, | |
158 | void *userdata, | |
159 | sd_bus_error *error) { | |
160 | ||
161 | User *u = userdata; | |
162 | int r; | |
163 | ||
164 | assert(bus); | |
165 | assert(reply); | |
166 | assert(u); | |
167 | ||
168 | r = user_check_linger_file(u); | |
169 | ||
170 | return sd_bus_message_append(reply, "b", r > 0); | |
171 | } | |
172 | ||
173 | int bus_user_method_terminate(sd_bus_message *message, void *userdata, sd_bus_error *error) { | |
174 | User *u = userdata; | |
175 | int r; | |
176 | ||
177 | assert(message); | |
178 | assert(u); | |
179 | ||
180 | r = bus_verify_polkit_async( | |
181 | message, | |
182 | CAP_KILL, | |
183 | "org.freedesktop.login1.manage", | |
184 | NULL, | |
185 | false, | |
186 | u->uid, | |
187 | &u->manager->polkit_registry, | |
188 | error); | |
189 | if (r < 0) | |
190 | return r; | |
191 | if (r == 0) | |
192 | return 1; /* Will call us back */ | |
193 | ||
194 | r = user_stop(u, true); | |
195 | if (r < 0) | |
196 | return r; | |
197 | ||
198 | return sd_bus_reply_method_return(message, NULL); | |
199 | } | |
200 | ||
201 | int bus_user_method_kill(sd_bus_message *message, void *userdata, sd_bus_error *error) { | |
202 | User *u = userdata; | |
203 | int32_t signo; | |
204 | int r; | |
205 | ||
206 | assert(message); | |
207 | assert(u); | |
208 | ||
209 | r = bus_verify_polkit_async( | |
210 | message, | |
211 | CAP_KILL, | |
212 | "org.freedesktop.login1.manage", | |
213 | NULL, | |
214 | false, | |
215 | u->uid, | |
216 | &u->manager->polkit_registry, | |
217 | error); | |
218 | if (r < 0) | |
219 | return r; | |
220 | if (r == 0) | |
221 | return 1; /* Will call us back */ | |
222 | ||
223 | r = sd_bus_message_read(message, "i", &signo); | |
224 | if (r < 0) | |
225 | return r; | |
226 | ||
227 | if (!SIGNAL_VALID(signo)) | |
228 | return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid signal %i", signo); | |
229 | ||
230 | r = user_kill(u, signo); | |
231 | if (r < 0) | |
232 | return r; | |
233 | ||
234 | return sd_bus_reply_method_return(message, NULL); | |
235 | } | |
236 | ||
237 | const sd_bus_vtable user_vtable[] = { | |
238 | SD_BUS_VTABLE_START(0), | |
239 | ||
240 | SD_BUS_PROPERTY("UID", "u", bus_property_get_uid, offsetof(User, uid), SD_BUS_VTABLE_PROPERTY_CONST), | |
241 | SD_BUS_PROPERTY("GID", "u", bus_property_get_gid, offsetof(User, gid), SD_BUS_VTABLE_PROPERTY_CONST), | |
242 | SD_BUS_PROPERTY("Name", "s", NULL, offsetof(User, name), SD_BUS_VTABLE_PROPERTY_CONST), | |
243 | BUS_PROPERTY_DUAL_TIMESTAMP("Timestamp", offsetof(User, timestamp), SD_BUS_VTABLE_PROPERTY_CONST), | |
244 | SD_BUS_PROPERTY("RuntimePath", "s", NULL, offsetof(User, runtime_path), SD_BUS_VTABLE_PROPERTY_CONST), | |
245 | SD_BUS_PROPERTY("Service", "s", NULL, offsetof(User, service), SD_BUS_VTABLE_PROPERTY_CONST), | |
246 | SD_BUS_PROPERTY("Slice", "s", NULL, offsetof(User, slice), SD_BUS_VTABLE_PROPERTY_CONST), | |
247 | SD_BUS_PROPERTY("Display", "(so)", property_get_display, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE), | |
248 | SD_BUS_PROPERTY("State", "s", property_get_state, 0, 0), | |
249 | SD_BUS_PROPERTY("Sessions", "a(so)", property_get_sessions, 0, 0), | |
250 | SD_BUS_PROPERTY("IdleHint", "b", property_get_idle_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE), | |
251 | SD_BUS_PROPERTY("IdleSinceHint", "t", property_get_idle_since_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE), | |
252 | SD_BUS_PROPERTY("IdleSinceHintMonotonic", "t", property_get_idle_since_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE), | |
253 | SD_BUS_PROPERTY("Linger", "b", property_get_linger, 0, 0), | |
254 | ||
255 | SD_BUS_METHOD("Terminate", NULL, NULL, bus_user_method_terminate, SD_BUS_VTABLE_UNPRIVILEGED), | |
256 | SD_BUS_METHOD("Kill", "i", NULL, bus_user_method_kill, SD_BUS_VTABLE_UNPRIVILEGED), | |
257 | ||
258 | SD_BUS_VTABLE_END | |
259 | }; | |
260 | ||
261 | int user_object_find(sd_bus *bus, const char *path, const char *interface, void *userdata, void **found, sd_bus_error *error) { | |
262 | Manager *m = userdata; | |
263 | uid_t uid; | |
264 | User *user; | |
265 | int r; | |
266 | ||
267 | assert(bus); | |
268 | assert(path); | |
269 | assert(interface); | |
270 | assert(found); | |
271 | assert(m); | |
272 | ||
273 | if (streq(path, "/org/freedesktop/login1/user/self")) { | |
274 | sd_bus_message *message; | |
275 | ||
276 | message = sd_bus_get_current_message(bus); | |
277 | if (!message) | |
278 | return 0; | |
279 | ||
280 | r = manager_get_user_from_creds(m, message, UID_INVALID, error, &user); | |
281 | if (r < 0) | |
282 | return r; | |
283 | } else { | |
284 | const char *p; | |
285 | ||
286 | p = startswith(path, "/org/freedesktop/login1/user/_"); | |
287 | if (!p) | |
288 | return 0; | |
289 | ||
290 | r = parse_uid(p, &uid); | |
291 | } | |
292 | if (r < 0) | |
293 | return 0; | |
294 | ||
295 | user = hashmap_get(m->users, UID_TO_PTR(uid)); | |
296 | if (!user) | |
297 | return 0; | |
298 | ||
299 | *found = user; | |
300 | return 1; | |
301 | } | |
302 | ||
303 | char *user_bus_path(User *u) { | |
304 | char *s; | |
305 | ||
306 | assert(u); | |
307 | ||
308 | if (asprintf(&s, "/org/freedesktop/login1/user/_"UID_FMT, u->uid) < 0) | |
309 | return NULL; | |
310 | ||
311 | return s; | |
312 | } | |
313 | ||
314 | int user_node_enumerator(sd_bus *bus, const char *path, void *userdata, char ***nodes, sd_bus_error *error) { | |
315 | _cleanup_strv_free_ char **l = NULL; | |
316 | sd_bus_message *message; | |
317 | Manager *m = userdata; | |
318 | User *user; | |
319 | Iterator i; | |
320 | int r; | |
321 | ||
322 | assert(bus); | |
323 | assert(path); | |
324 | assert(nodes); | |
325 | ||
326 | HASHMAP_FOREACH(user, m->users, i) { | |
327 | char *p; | |
328 | ||
329 | p = user_bus_path(user); | |
330 | if (!p) | |
331 | return -ENOMEM; | |
332 | ||
333 | r = strv_consume(&l, p); | |
334 | if (r < 0) | |
335 | return r; | |
336 | } | |
337 | ||
338 | message = sd_bus_get_current_message(bus); | |
339 | if (message) { | |
340 | _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL; | |
341 | uid_t uid; | |
342 | ||
343 | r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_OWNER_UID|SD_BUS_CREDS_AUGMENT, &creds); | |
344 | if (r >= 0) { | |
345 | r = sd_bus_creds_get_owner_uid(creds, &uid); | |
346 | if (r >= 0) { | |
347 | user = hashmap_get(m->users, UID_TO_PTR(uid)); | |
348 | if (user) { | |
349 | r = strv_extend(&l, "/org/freedesktop/login1/user/self"); | |
350 | if (r < 0) | |
351 | return r; | |
352 | } | |
353 | } | |
354 | } | |
355 | } | |
356 | ||
357 | *nodes = l; | |
358 | l = NULL; | |
359 | ||
360 | return 1; | |
361 | } | |
362 | ||
363 | int user_send_signal(User *u, bool new_user) { | |
364 | _cleanup_free_ char *p = NULL; | |
365 | ||
366 | assert(u); | |
367 | ||
368 | p = user_bus_path(u); | |
369 | if (!p) | |
370 | return -ENOMEM; | |
371 | ||
372 | return sd_bus_emit_signal( | |
373 | u->manager->bus, | |
374 | "/org/freedesktop/login1", | |
375 | "org.freedesktop.login1.Manager", | |
376 | new_user ? "UserNew" : "UserRemoved", | |
377 | "uo", (uint32_t) u->uid, p); | |
378 | } | |
379 | ||
380 | int user_send_changed(User *u, const char *properties, ...) { | |
381 | _cleanup_free_ char *p = NULL; | |
382 | char **l; | |
383 | ||
384 | assert(u); | |
385 | ||
386 | if (!u->started) | |
387 | return 0; | |
388 | ||
389 | p = user_bus_path(u); | |
390 | if (!p) | |
391 | return -ENOMEM; | |
392 | ||
393 | l = strv_from_stdarg_alloca(properties); | |
394 | ||
395 | return sd_bus_emit_properties_changed_strv(u->manager->bus, p, "org.freedesktop.login1.User", l); | |
396 | } |