src/login/logind-user-dbus.c

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
   2
   3 #include "sd-bus.h"
   4
   5 #include "alloc-util.h"
   6 #include "bus-get-properties.h"
   7 #include "bus-object.h"
   8 #include "bus-polkit.h"
   9 #include "format-util.h"
  10 #include "hashmap.h"
  11 #include "logind.h"
  12 #include "logind-dbus.h"
  13 #include "logind-session.h"
  14 #include "logind-session-dbus.h"
  15 #include "logind-user.h"
  16 #include "logind-user-dbus.h"
  17 #include "signal-util.h"
  18 #include "string-util.h"
  19 #include "strv.h"
  20 #include "user-record.h"
  21 #include "user-util.h"
  22
  23 static int property_get_uid(
  24                 sd_bus *bus,
  25                 const char *path,
  26                 const char *interface,
  27                 const char *property,
  28                 sd_bus_message *reply,
  29                 void *userdata,
  30                 sd_bus_error *error) {
  31
  32         User *u = ASSERT_PTR(userdata);
  33
  34         assert(bus);
  35         assert(reply);
  36
  37         return sd_bus_message_append(reply, "u", (uint32_t) u->user_record->uid);
  38 }
  39
  40 static int property_get_gid(
  41                 sd_bus *bus,
  42                 const char *path,
  43                 const char *interface,
  44                 const char *property,
  45                 sd_bus_message *reply,
  46                 void *userdata,
  47                 sd_bus_error *error) {
  48
  49         User *u = ASSERT_PTR(userdata);
  50
  51         assert(bus);
  52         assert(reply);
  53
  54         return sd_bus_message_append(reply, "u", (uint32_t) u->user_record->gid);
  55 }
  56
  57 static int property_get_name(
  58                 sd_bus *bus,
  59                 const char *path,
  60                 const char *interface,
  61                 const char *property,
  62                 sd_bus_message *reply,
  63                 void *userdata,
  64                 sd_bus_error *error) {
  65
  66         User *u = ASSERT_PTR(userdata);
  67
  68         assert(bus);
  69         assert(reply);
  70
  71         return sd_bus_message_append(reply, "s", u->user_record->user_name);
  72 }
  73
  74 static BUS_DEFINE_PROPERTY_GET2(property_get_state, "s", User, user_get_state, user_state_to_string);
  75
  76 static int property_get_display(
  77                 sd_bus *bus,
  78                 const char *path,
  79                 const char *interface,
  80                 const char *property,
  81                 sd_bus_message *reply,
  82                 void *userdata,
  83                 sd_bus_error *error) {
  84
  85         _cleanup_free_ char *p = NULL;
  86         User *u = ASSERT_PTR(userdata);
  87
  88         assert(bus);
  89         assert(reply);
  90
  91         p = u->display ? session_bus_path(u->display) : strdup("/");
  92         if (!p)
  93                 return -ENOMEM;
  94
  95         return sd_bus_message_append(reply, "(so)", u->display ? u->display->id : "", p);
  96 }
  97
  98 static int property_get_sessions(
  99                 sd_bus *bus,
 100                 const char *path,
 101                 const char *interface,
 102                 const char *property,
 103                 sd_bus_message *reply,
 104                 void *userdata,
 105                 sd_bus_error *error) {
 106
 107         User *u = ASSERT_PTR(userdata);
 108         int r;
 109
 110         assert(bus);
 111         assert(reply);
 112
 113         r = sd_bus_message_open_container(reply, 'a', "(so)");
 114         if (r < 0)
 115                 return r;
 116
 117         LIST_FOREACH(sessions_by_user, session, u->sessions) {
 118                 _cleanup_free_ char *p = NULL;
 119
 120                 p = session_bus_path(session);
 121                 if (!p)
 122                         return -ENOMEM;
 123
 124                 r = sd_bus_message_append(reply, "(so)", session->id, p);
 125                 if (r < 0)
 126                         return r;
 127
 128         }
 129
 130         return sd_bus_message_close_container(reply);
 131 }
 132
 133 static int property_get_idle_hint(
 134                 sd_bus *bus,
 135                 const char *path,
 136                 const char *interface,
 137                 const char *property,
 138                 sd_bus_message *reply,
 139                 void *userdata,
 140                 sd_bus_error *error) {
 141
 142         User *u = ASSERT_PTR(userdata);
 143
 144         assert(bus);
 145         assert(reply);
 146
 147         return sd_bus_message_append(reply, "b", user_get_idle_hint(u, NULL) > 0);
 148 }
 149
 150 static int property_get_idle_since_hint(
 151                 sd_bus *bus,
 152                 const char *path,
 153                 const char *interface,
 154                 const char *property,
 155                 sd_bus_message *reply,
 156                 void *userdata,
 157                 sd_bus_error *error) {
 158
 159         User *u = ASSERT_PTR(userdata);
 160         dual_timestamp t = DUAL_TIMESTAMP_NULL;
 161         uint64_t k;
 162
 163         assert(bus);
 164         assert(reply);
 165
 166         (void) user_get_idle_hint(u, &t);
 167         k = streq(property, "IdleSinceHint") ? t.realtime : t.monotonic;
 168
 169         return sd_bus_message_append(reply, "t", k);
 170 }
 171
 172 static int property_get_linger(
 173                 sd_bus *bus,
 174                 const char *path,
 175                 const char *interface,
 176                 const char *property,
 177                 sd_bus_message *reply,
 178                 void *userdata,
 179                 sd_bus_error *error) {
 180
 181         User *u = ASSERT_PTR(userdata);
 182         int r;
 183
 184         assert(bus);
 185         assert(reply);
 186
 187         r = user_check_linger_file(u);
 188
 189         return sd_bus_message_append(reply, "b", r > 0);
 190 }
 191
 192 int bus_user_method_terminate(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 193         User *u = ASSERT_PTR(userdata);
 194         int r;
 195
 196         assert(message);
 197
 198         r = bus_verify_polkit_async_full(
 199                         message,
 200                         "org.freedesktop.login1.manage",
 201                         /* details= */ NULL,
 202                         u->user_record->uid,
 203                         /* flags= */ 0,
 204                         &u->manager->polkit_registry,
 205                         error);
 206         if (r < 0)
 207                 return r;
 208         if (r == 0)
 209                 return 1; /* Will call us back */
 210
 211         r = user_stop(u, /* force = */ true);
 212         if (r < 0)
 213                 return r;
 214
 215         return sd_bus_reply_method_return(message, NULL);
 216 }
 217
 218 int bus_user_method_kill(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 219         User *u = ASSERT_PTR(userdata);
 220         int32_t signo;
 221         int r;
 222
 223         assert(message);
 224
 225         r = bus_verify_polkit_async_full(
 226                         message,
 227                         "org.freedesktop.login1.manage",
 228                         /* details= */ NULL,
 229                         u->user_record->uid,
 230                         /* flags= */ 0,
 231                         &u->manager->polkit_registry,
 232                         error);
 233         if (r < 0)
 234                 return r;
 235         if (r == 0)
 236                 return 1; /* Will call us back */
 237
 238         r = sd_bus_message_read(message, "i", &signo);
 239         if (r < 0)
 240                 return r;
 241
 242         if (!SIGNAL_VALID(signo))
 243                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid signal %i", signo);
 244
 245         r = user_kill(u, signo);
 246         if (r < 0)
 247                 return r;
 248
 249         return sd_bus_reply_method_return(message, NULL);
 250 }
 251
 252 static int user_object_find(sd_bus *bus, const char *path, const char *interface, void *userdata, void **found, sd_bus_error *error) {
 253         Manager *m = ASSERT_PTR(userdata);
 254         uid_t uid;
 255         User *user;
 256         int r;
 257
 258         assert(bus);
 259         assert(path);
 260         assert(interface);
 261         assert(found);
 262
 263         if (streq(path, "/org/freedesktop/login1/user/self")) {
 264                 sd_bus_message *message;
 265
 266                 message = sd_bus_get_current_message(bus);
 267
 268                 r = manager_get_user_from_creds(m, message, UID_INVALID, error, &user);
 269                 if (r == -ENXIO) {
 270                         sd_bus_error_free(error);
 271                         return 0;
 272                 }
 273                 if (r < 0)
 274                         return r;
 275         } else {
 276                 const char *p;
 277
 278                 p = startswith(path, "/org/freedesktop/login1/user/_");
 279                 if (!p)
 280                         return 0;
 281
 282                 r = parse_uid(p, &uid);
 283                 if (r < 0)
 284                         return 0;
 285
 286                 user = hashmap_get(m->users, UID_TO_PTR(uid));
 287                 if (!user)
 288                         return 0;
 289         }
 290
 291         *found = user;
 292         return 1;
 293 }
 294
 295 char* user_bus_path(User *u) {
 296         char *s;
 297
 298         assert(u);
 299
 300         if (asprintf(&s, "/org/freedesktop/login1/user/_"UID_FMT, u->user_record->uid) < 0)
 301                 return NULL;
 302
 303         return s;
 304 }
 305
 306 static int user_node_enumerator(sd_bus *bus, const char *path, void *userdata, char ***nodes, sd_bus_error *error) {
 307         _cleanup_strv_free_ char **l = NULL;
 308         sd_bus_message *message;
 309         Manager *m = userdata;
 310         User *user;
 311         int r;
 312
 313         assert(bus);
 314         assert(path);
 315         assert(nodes);
 316
 317         HASHMAP_FOREACH(user, m->users) {
 318                 char *p;
 319
 320                 p = user_bus_path(user);
 321                 if (!p)
 322                         return -ENOMEM;
 323
 324                 r = strv_consume(&l, p);
 325                 if (r < 0)
 326                         return r;
 327         }
 328
 329         message = sd_bus_get_current_message(bus);
 330         if (message) {
 331                 _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
 332
 333                 r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_OWNER_UID|SD_BUS_CREDS_AUGMENT, &creds);
 334                 if (r >= 0) {
 335                         uid_t uid;
 336
 337                         r = sd_bus_creds_get_owner_uid(creds, &uid);
 338                         if (r >= 0) {
 339                                 user = hashmap_get(m->users, UID_TO_PTR(uid));
 340                                 if (user) {
 341                                         r = strv_extend(&l, "/org/freedesktop/login1/user/self");
 342                                         if (r < 0)
 343                                                 return r;
 344                                 }
 345                         }
 346                 }
 347         }
 348
 349         *nodes = TAKE_PTR(l);
 350
 351         return 1;
 352 }
 353
 354 static const sd_bus_vtable user_vtable[] = {
 355         SD_BUS_VTABLE_START(0),
 356
 357         SD_BUS_PROPERTY("UID", "u", property_get_uid, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 358         SD_BUS_PROPERTY("GID", "u", property_get_gid, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 359         SD_BUS_PROPERTY("Name", "s", property_get_name, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 360         BUS_PROPERTY_DUAL_TIMESTAMP("Timestamp", offsetof(User, timestamp), SD_BUS_VTABLE_PROPERTY_CONST),
 361         SD_BUS_PROPERTY("RuntimePath", "s", NULL, offsetof(User, runtime_path), SD_BUS_VTABLE_PROPERTY_CONST),
 362         SD_BUS_PROPERTY("Service", "s", NULL, offsetof(User, service_manager_unit), SD_BUS_VTABLE_PROPERTY_CONST),
 363         SD_BUS_PROPERTY("Slice", "s", NULL, offsetof(User, slice), SD_BUS_VTABLE_PROPERTY_CONST),
 364         SD_BUS_PROPERTY("Display", "(so)", property_get_display, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 365         SD_BUS_PROPERTY("State", "s", property_get_state, 0, 0),
 366         SD_BUS_PROPERTY("Sessions", "a(so)", property_get_sessions, 0, 0),
 367         SD_BUS_PROPERTY("IdleHint", "b", property_get_idle_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 368         SD_BUS_PROPERTY("IdleSinceHint", "t", property_get_idle_since_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 369         SD_BUS_PROPERTY("IdleSinceHintMonotonic", "t", property_get_idle_since_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 370         SD_BUS_PROPERTY("Linger", "b", property_get_linger, 0, 0),
 371
 372         SD_BUS_METHOD("Terminate", NULL, NULL, bus_user_method_terminate, SD_BUS_VTABLE_UNPRIVILEGED),
 373         SD_BUS_METHOD_WITH_ARGS("Kill",
 374                                 SD_BUS_ARGS("i", signal_number),
 375                                 SD_BUS_NO_RESULT,
 376                                 bus_user_method_kill,
 377                                 SD_BUS_VTABLE_UNPRIVILEGED),
 378
 379         SD_BUS_VTABLE_END
 380 };
 381
 382 const BusObjectImplementation user_object = {
 383         "/org/freedesktop/login1/user",
 384         "org.freedesktop.login1.User",
 385         .fallback_vtables = BUS_FALLBACK_VTABLES({user_vtable, user_object_find}),
 386         .node_enumerator = user_node_enumerator,
 387 };
 388
 389 int user_send_signal(User *u, bool new_user) {
 390         _cleanup_free_ char *p = NULL;
 391
 392         assert(u);
 393
 394         p = user_bus_path(u);
 395         if (!p)
 396                 return -ENOMEM;
 397
 398         return sd_bus_emit_signal(
 399                         u->manager->bus,
 400                         "/org/freedesktop/login1",
 401                         "org.freedesktop.login1.Manager",
 402                         new_user ? "UserNew" : "UserRemoved",
 403                         "uo", (uint32_t) u->user_record->uid, p);
 404 }
 405
 406 int user_send_changed_strv(User *u, char **properties) {
 407         _cleanup_free_ char *p = NULL;
 408
 409         assert(u);
 410
 411         if (!u->started)
 412                 return 0;
 413
 414         p = user_bus_path(u);
 415         if (!p)
 416                 return -ENOMEM;
 417
 418         return sd_bus_emit_properties_changed_strv(u->manager->bus, p, "org.freedesktop.login1.User", properties);
 419 }