src/login/logind-dbus.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2011 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU General Public License as published by
  10   the Free Software Foundation; either version 2 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <errno.h>
  23 #include <string.h>
  24 #include <unistd.h>
  25 #include <pwd.h>
  26
  27 #include "logind.h"
  28 #include "dbus-common.h"
  29 #include "strv.h"
  30 #include "polkit.h"
  31 #include "special.h"
  32
  33 #define BUS_MANAGER_INTERFACE                                           \
  34         " <interface name=\"org.freedesktop.login1.Manager\">\n"        \
  35         "  <method name=\"GetSession\">\n"                              \
  36         "   <arg name=\"id\" type=\"s\" direction=\"in\"/>\n"           \
  37         "   <arg name=\"session\" type=\"o\" direction=\"out\"/>\n"     \
  38         "  </method>\n"                                                 \
  39         "  <method name=\"GetUser\">\n"                                 \
  40         "   <arg name=\"uid\" type=\"u\" direction=\"in\"/>\n"          \
  41         "   <arg name=\"user\" type=\"o\" direction=\"out\"/>\n"        \
  42         "  </method>\n"                                                 \
  43         "  <method name=\"GetSeat\">\n"                                 \
  44         "   <arg name=\"id\" type=\"s\" direction=\"in\"/>\n"           \
  45         "   <arg name=\"seat\" type=\"o\" direction=\"out\"/>\n"        \
  46         "  </method>\n"                                                 \
  47         "  <method name=\"ListSessions\">\n"                            \
  48         "   <arg name=\"sessions\" type=\"a(susso)\" direction=\"out\"/>\n" \
  49         "  </method>\n"                                                 \
  50         "  <method name=\"ListUsers\">\n"                               \
  51         "   <arg name=\"users\" type=\"a(uso)\" direction=\"out\"/>\n"  \
  52         "  </method>\n"                                                 \
  53         "  <method name=\"ListSeats\">\n"                               \
  54         "   <arg name=\"seats\" type=\"a(so)\" direction=\"out\"/>\n"   \
  55         "  </method>\n"                                                 \
  56         "  <method name=\"CreateSession\">\n"                           \
  57         "   <arg name=\"uid\" type=\"u\" direction=\"in\"/>\n"          \
  58         "   <arg name=\"leader\" type=\"u\" direction=\"in\"/>\n"       \
  59         "   <arg name=\"sevice\" type=\"s\" direction=\"in\"/>\n"       \
  60         "   <arg name=\"type\" type=\"s\" direction=\"in\"/>\n"         \
  61         "   <arg name=\"seat\" type=\"s\" direction=\"in\"/>\n"         \
  62         "   <arg name=\"vtnr\" type=\"u\" direction=\"in\"/>\n"         \
  63         "   <arg name=\"tty\" type=\"s\" direction=\"in\"/>\n"          \
  64         "   <arg name=\"display\" type=\"s\" direction=\"in\"/>\n"      \
  65         "   <arg name=\"remote\" type=\"b\" direction=\"in\"/>\n"       \
  66         "   <arg name=\"remote_user\" type=\"s\" direction=\"in\"/>\n"  \
  67         "   <arg name=\"remote_host\" type=\"s\" direction=\"in\"/>\n"  \
  68         "   <arg name=\"controllers\" type=\"as\" direction=\"in\"/>\n" \
  69         "   <arg name=\"reset_controllers\" type=\"as\" direction=\"in\"/>\n" \
  70         "   <arg name=\"kill_processes\" type=\"b\" direction=\"in\"/>\n" \
  71         "   <arg name=\"id\" type=\"s\" direction=\"out\"/>\n"          \
  72         "   <arg name=\"path\" type=\"o\" direction=\"out\"/>\n"        \
  73         "   <arg name=\"runtime_path\" type=\"o\" direction=\"out\"/>\n" \
  74         "   <arg name=\"fd\" type=\"h\" direction=\"out\"/>\n"          \
  75         "   <arg name=\"seat\" type=\"s\" direction=\"out\"/>\n"        \
  76         "   <arg name=\"vtnr\" type=\"u\" direction=\"out\"/>\n"        \
  77         "  </method>\n"                                                 \
  78         "  <method name=\"ActivateSession\">\n"                         \
  79         "   <arg name=\"id\" type=\"s\" direction=\"in\"/>\n"           \
  80         "  </method>\n"                                                 \
  81         "  <method name=\"LockSession\">\n"                             \
  82         "   <arg name=\"id\" type=\"s\" direction=\"in\"/>\n"           \
  83         "  </method>\n"                                                 \
  84         "  <method name=\"UnlockSession\">\n"                           \
  85         "   <arg name=\"id\" type=\"s\" direction=\"in\"/>\n"           \
  86         "  </method>\n"                                                 \
  87         "  <method name=\"KillSession\">\n"                             \
  88         "   <arg name=\"id\" type=\"s\" direction=\"in\"/>\n"           \
  89         "   <arg name=\"who\" type=\"s\"/>\n"                           \
  90         "   <arg name=\"signal\" type=\"s\"/>\n"                        \
  91         "  </method>\n"                                                 \
  92         "  <method name=\"KillUser\">\n"                                \
  93         "   <arg name=\"uid\" type=\"u\" direction=\"in\"/>\n"          \
  94         "   <arg name=\"signal\" type=\"s\"/>\n"                        \
  95         "  </method>\n"                                                 \
  96         "  <method name=\"TerminateSession\">\n"                        \
  97         "   <arg name=\"id\" type=\"s\" direction=\"in\"/>\n"           \
  98         "  </method>\n"                                                 \
  99         "  <method name=\"TerminateUser\">\n"                           \
 100         "   <arg name=\"uid\" type=\"u\" direction=\"in\"/>\n"          \
 101         "  </method>\n"                                                 \
 102         "  <method name=\"TerminateSeat\">\n"                           \
 103         "   <arg name=\"id\" type=\"s\" direction=\"in\"/>\n"           \
 104         "  </method>\n"                                                 \
 105         "  <method name=\"SetUserLinger\">\n"                           \
 106         "   <arg name=\"uid\" type=\"u\" direction=\"in\"/>\n"          \
 107         "   <arg name=\"b\" type=\"b\" direction=\"in\"/>\n"            \
 108         "   <arg name=\"interactive\" type=\"b\" direction=\"in\"/>\n"  \
 109         "  </method>\n"                                                 \
 110         "  <method name=\"AttachDevice\">\n"                            \
 111         "   <arg name=\"seat\" type=\"s\" direction=\"in\"/>\n"         \
 112         "   <arg name=\"sysfs\" type=\"s\" direction=\"in\"/>\n"        \
 113         "   <arg name=\"interactive\" type=\"b\" direction=\"in\"/>\n"  \
 114         "  </method>\n"                                                 \
 115         "  <method name=\"FlushDevices\">\n"                            \
 116         "   <arg name=\"interactive\" type=\"b\" direction=\"in\"/>\n"  \
 117         "  </method>\n"                                                 \
 118         "  <method name=\"PowerOff\">\n"                                \
 119         "   <arg name=\"interactive\" type=\"b\" direction=\"in\"/>\n"  \
 120         "  </method>\n"                                                 \
 121         "  <method name=\"Reboot\">\n"                                  \
 122         "   <arg name=\"interactive\" type=\"b\" direction=\"in\"/>\n"  \
 123         "  </method>\n"                                                 \
 124         "  <signal name=\"SessionNew\">\n"                              \
 125         "   <arg name=\"id\" type=\"s\"/>\n"                            \
 126         "   <arg name=\"path\" type=\"o\"/>\n"                          \
 127         "  </signal>\n"                                                 \
 128         "  <signal name=\"SessionRemoved\">\n"                          \
 129         "   <arg name=\"id\" type=\"s\"/>\n"                            \
 130         "   <arg name=\"path\" type=\"o\"/>\n"                          \
 131         "  </signal>\n"                                                 \
 132         "  <signal name=\"UserNew\">\n"                                 \
 133         "   <arg name=\"uid\" type=\"u\"/>\n"                           \
 134         "   <arg name=\"path\" type=\"o\"/>\n"                          \
 135         "  </signal>\n"                                                 \
 136         "  <signal name=\"UserRemoved\">\n"                             \
 137         "   <arg name=\"uid\" type=\"u\"/>\n"                           \
 138         "   <arg name=\"path\" type=\"o\"/>\n"                          \
 139         "  </signal>\n"                                                 \
 140         "  <signal name=\"SeatNew\">\n"                                 \
 141         "   <arg name=\"id\" type=\"s\"/>\n"                            \
 142         "   <arg name=\"path\" type=\"o\"/>\n"                          \
 143         "  </signal>\n"                                                 \
 144         "  <signal name=\"SeatRemoved\">\n"                             \
 145         "   <arg name=\"id\" type=\"s\"/>\n"                            \
 146         "   <arg name=\"path\" type=\"o\"/>\n"                          \
 147         "  </signal>\n"                                                 \
 148         "  <property name=\"ControlGroupHierarchy\" type=\"s\" access=\"read\"/>\n" \
 149         "  <property name=\"Controllers\" type=\"as\" access=\"read\"/>\n" \
 150         "  <property name=\"ResetControllers\" type=\"as\" access=\"read\"/>\n" \
 151         "  <property name=\"NAutoVTs\" type=\"u\" access=\"read\"/>\n" \
 152         "  <property name=\"KillOnlyUsers\" type=\"as\" access=\"read\"/>\n" \
 153         "  <property name=\"KillExcludeUsers\" type=\"as\" access=\"read\"/>\n" \
 154         "  <property name=\"KillUserProcesses\" type=\"b\" access=\"read\"/>\n" \
 155         "  <property name=\"IdleHint\" type=\"b\" access=\"read\"/>\n"  \
 156         "  <property name=\"IdleSinceHint\" type=\"t\" access=\"read\"/>\n" \
 157         "  <property name=\"IdleSinceHintMonotonic\" type=\"t\" access=\"read\"/>\n" \
 158         " </interface>\n"
 159
 160 #define INTROSPECTION_BEGIN                                             \
 161         DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE                       \
 162         "<node>\n"                                                      \
 163         BUS_MANAGER_INTERFACE                                           \
 164         BUS_PROPERTIES_INTERFACE                                        \
 165         BUS_PEER_INTERFACE                                              \
 166         BUS_INTROSPECTABLE_INTERFACE
 167
 168 #define INTROSPECTION_END                                               \
 169         "</node>\n"
 170
 171 #define INTERFACES_LIST                              \
 172         BUS_GENERIC_INTERFACES_LIST                  \
 173         "org.freedesktop.login1.Manager\0"
 174
 175 static int bus_manager_append_idle_hint(DBusMessageIter *i, const char *property, void *data) {
 176         Manager *m = data;
 177         dbus_bool_t b;
 178
 179         assert(i);
 180         assert(property);
 181         assert(m);
 182
 183         b = manager_get_idle_hint(m, NULL) > 0;
 184         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &b))
 185                 return -ENOMEM;
 186
 187         return 0;
 188 }
 189
 190 static int bus_manager_append_idle_hint_since(DBusMessageIter *i, const char *property, void *data) {
 191         Manager *m = data;
 192         dual_timestamp t;
 193         uint64_t u;
 194
 195         assert(i);
 196         assert(property);
 197         assert(m);
 198
 199         manager_get_idle_hint(m, &t);
 200         u = streq(property, "IdleSinceHint") ? t.realtime : t.monotonic;
 201
 202         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_UINT64, &u))
 203                 return -ENOMEM;
 204
 205         return 0;
 206 }
 207
 208 static int bus_manager_create_session(Manager *m, DBusMessage *message, DBusMessage **_reply) {
 209         Session *session = NULL;
 210         User *user = NULL;
 211         const char *type, *seat, *tty, *display, *remote_user, *remote_host, *service;
 212         uint32_t uid, leader, audit_id = 0;
 213         dbus_bool_t remote, kill_processes;
 214         char **controllers = NULL, **reset_controllers = NULL;
 215         SessionType t;
 216         Seat *s;
 217         DBusMessageIter iter;
 218         int r;
 219         char *id = NULL, *p;
 220         uint32_t vtnr = 0;
 221         int fifo_fd = -1;
 222         DBusMessage *reply = NULL;
 223         bool b;
 224
 225         assert(m);
 226         assert(message);
 227         assert(_reply);
 228
 229         if (!dbus_message_iter_init(message, &iter) ||
 230             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_UINT32)
 231                 return -EINVAL;
 232
 233         dbus_message_iter_get_basic(&iter, &uid);
 234
 235         if (!dbus_message_iter_next(&iter) ||
 236             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_UINT32)
 237                 return -EINVAL;
 238
 239         dbus_message_iter_get_basic(&iter, &leader);
 240
 241         if (leader <= 0 ||
 242             !dbus_message_iter_next(&iter) ||
 243             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING)
 244                 return -EINVAL;
 245
 246         dbus_message_iter_get_basic(&iter, &service);
 247
 248         if (!dbus_message_iter_next(&iter) ||
 249             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING)
 250                 return -EINVAL;
 251
 252         dbus_message_iter_get_basic(&iter, &type);
 253         t = session_type_from_string(type);
 254
 255         if (t < 0 ||
 256             !dbus_message_iter_next(&iter) ||
 257             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING)
 258                 return -EINVAL;
 259
 260         dbus_message_iter_get_basic(&iter, &seat);
 261
 262         if (isempty(seat))
 263                 s = NULL;
 264         else {
 265                 s = hashmap_get(m->seats, seat);
 266                 if (!s)
 267                         return -ENOENT;
 268         }
 269
 270         if (!dbus_message_iter_next(&iter) ||
 271             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_UINT32)
 272                 return -EINVAL;
 273
 274         dbus_message_iter_get_basic(&iter, &vtnr);
 275
 276         if (!dbus_message_iter_next(&iter) ||
 277             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING)
 278                 return -EINVAL;
 279
 280         dbus_message_iter_get_basic(&iter, &tty);
 281
 282         if (tty_is_vc(tty)) {
 283                 int v;
 284
 285                 if (!s)
 286                         s = m->vtconsole;
 287                 else if (s != m->vtconsole)
 288                         return -EINVAL;
 289
 290                 v = vtnr_from_tty(tty);
 291
 292                 if (v <= 0)
 293                         return v < 0 ? v : -EINVAL;
 294
 295                 if (vtnr <= 0)
 296                         vtnr = (uint32_t) v;
 297                 else if (vtnr != (uint32_t) v)
 298                         return -EINVAL;
 299
 300         } else if (!isempty(tty) && s && seat_is_vtconsole(s))
 301                 return -EINVAL;
 302
 303         if (s) {
 304                 if (seat_can_multi_session(s)) {
 305                         if (vtnr <= 0 || vtnr > 63)
 306                                 return -EINVAL;
 307                 } else {
 308                         if (vtnr > 0)
 309                                 return -EINVAL;
 310                 }
 311         }
 312
 313         if (!dbus_message_iter_next(&iter) ||
 314             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING)
 315                 return -EINVAL;
 316
 317         dbus_message_iter_get_basic(&iter, &display);
 318
 319         if (!dbus_message_iter_next(&iter) ||
 320             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_BOOLEAN)
 321                 return -EINVAL;
 322
 323         dbus_message_iter_get_basic(&iter, &remote);
 324
 325         if (!dbus_message_iter_next(&iter) ||
 326             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING)
 327                 return -EINVAL;
 328
 329         dbus_message_iter_get_basic(&iter, &remote_user);
 330
 331         if (!dbus_message_iter_next(&iter) ||
 332             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING)
 333                 return -EINVAL;
 334
 335         dbus_message_iter_get_basic(&iter, &remote_host);
 336
 337         if (!dbus_message_iter_next(&iter) ||
 338             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_ARRAY ||
 339             dbus_message_iter_get_element_type(&iter) != DBUS_TYPE_STRING)
 340                 return -EINVAL;
 341
 342         r = bus_parse_strv_iter(&iter, &controllers);
 343         if (r < 0)
 344                 return -EINVAL;
 345
 346         if (strv_contains(controllers, "systemd") ||
 347             !dbus_message_iter_next(&iter) ||
 348             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_ARRAY ||
 349             dbus_message_iter_get_element_type(&iter) != DBUS_TYPE_STRING) {
 350                 r = -EINVAL;
 351                 goto fail;
 352         }
 353
 354         r = bus_parse_strv_iter(&iter, &reset_controllers);
 355         if (r < 0)
 356                 goto fail;
 357
 358         if (strv_contains(reset_controllers, "systemd") ||
 359             !dbus_message_iter_next(&iter) ||
 360             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_BOOLEAN) {
 361                 r = -EINVAL;
 362                 goto fail;
 363         }
 364
 365         dbus_message_iter_get_basic(&iter, &kill_processes);
 366
 367         r = manager_add_user_by_uid(m, uid, &user);
 368         if (r < 0)
 369                 goto fail;
 370
 371         audit_session_from_pid(leader, &audit_id);
 372
 373         if (audit_id > 0) {
 374                 asprintf(&id, "%lu", (unsigned long) audit_id);
 375
 376                 if (!id) {
 377                         r = -ENOMEM;
 378                         goto fail;
 379                 }
 380
 381                 session = hashmap_get(m->sessions, id);
 382
 383                 if (session) {
 384                         free(id);
 385
 386                         fifo_fd = session_create_fifo(session);
 387                         if (fifo_fd < 0) {
 388                                 r = fifo_fd;
 389                                 goto fail;
 390                         }
 391
 392                         /* Session already exists, client is probably
 393                          * something like "su" which changes uid but
 394                          * is still the same audit session */
 395
 396                         reply = dbus_message_new_method_return(message);
 397                         if (!reply) {
 398                                 r = -ENOMEM;
 399                                 goto fail;
 400                         }
 401
 402                         p = session_bus_path(session);
 403                         if (!p) {
 404                                 r = -ENOMEM;
 405                                 goto fail;
 406                         }
 407
 408                         seat = session->seat ? session->seat->id : "";
 409                         vtnr = session->vtnr;
 410                         b = dbus_message_append_args(
 411                                         reply,
 412                                         DBUS_TYPE_STRING, &session->id,
 413                                         DBUS_TYPE_OBJECT_PATH, &p,
 414                                         DBUS_TYPE_STRING, &session->user->runtime_path,
 415                                         DBUS_TYPE_UNIX_FD, &fifo_fd,
 416                                         DBUS_TYPE_STRING, &seat,
 417                                         DBUS_TYPE_UINT32, &vtnr,
 418                                         DBUS_TYPE_INVALID);
 419                         free(p);
 420
 421                         if (!b) {
 422                                 r = -ENOMEM;
 423                                 goto fail;
 424                         }
 425
 426                         close_nointr_nofail(fifo_fd);
 427                         *_reply = reply;
 428
 429                         strv_free(controllers);
 430                         strv_free(reset_controllers);
 431
 432                         return 0;
 433                 }
 434
 435         } else {
 436                 do {
 437                         free(id);
 438                         asprintf(&id, "c%lu", ++m->session_counter);
 439
 440                         if (!id) {
 441                                 r = -ENOMEM;
 442                                 goto fail;
 443                         }
 444
 445                 } while (hashmap_get(m->sessions, id));
 446         }
 447
 448         r = manager_add_session(m, user, id, &session);
 449         free(id);
 450         if (r < 0)
 451                 goto fail;
 452
 453         session->leader = leader;
 454         session->audit_id = audit_id;
 455         session->type = t;
 456         session->remote = remote;
 457         session->controllers = controllers;
 458         session->reset_controllers = reset_controllers;
 459         session->kill_processes = kill_processes;
 460         session->vtnr = vtnr;
 461
 462         controllers = reset_controllers = NULL;
 463
 464         if (!isempty(tty)) {
 465                 session->tty = strdup(tty);
 466                 if (!session->tty) {
 467                         r = -ENOMEM;
 468                         goto fail;
 469                 }
 470         }
 471
 472         if (!isempty(display)) {
 473                 session->display = strdup(display);
 474                 if (!session->display) {
 475                         r = -ENOMEM;
 476                         goto fail;
 477                 }
 478         }
 479
 480         if (!isempty(remote_user)) {
 481                 session->remote_user = strdup(remote_user);
 482                 if (!session->remote_user) {
 483                         r = -ENOMEM;
 484                         goto fail;
 485                 }
 486         }
 487
 488         if (!isempty(remote_host)) {
 489                 session->remote_host = strdup(remote_host);
 490                 if (!session->remote_host) {
 491                         r = -ENOMEM;
 492                         goto fail;
 493                 }
 494         }
 495
 496         if (!isempty(service)) {
 497                 session->service = strdup(service);
 498                 if (!session->service) {
 499                         r = -ENOMEM;
 500                         goto fail;
 501                 }
 502         }
 503
 504         fifo_fd = session_create_fifo(session);
 505         if (fifo_fd < 0) {
 506                 r = fifo_fd;
 507                 goto fail;
 508         }
 509
 510         if (s) {
 511                 r = seat_attach_session(s, session);
 512                 if (r < 0)
 513                         goto fail;
 514         }
 515
 516         r = session_start(session);
 517         if (r < 0)
 518                 goto fail;
 519
 520         reply = dbus_message_new_method_return(message);
 521         if (!reply) {
 522                 r = -ENOMEM;
 523                 goto fail;
 524         }
 525
 526         p = session_bus_path(session);
 527         if (!p) {
 528                 r = -ENOMEM;
 529                 goto fail;
 530         }
 531
 532         seat = s ? s->id : "";
 533         b = dbus_message_append_args(
 534                         reply,
 535                         DBUS_TYPE_STRING, &session->id,
 536                         DBUS_TYPE_OBJECT_PATH, &p,
 537                         DBUS_TYPE_STRING, &session->user->runtime_path,
 538                         DBUS_TYPE_UNIX_FD, &fifo_fd,
 539                         DBUS_TYPE_STRING, &seat,
 540                         DBUS_TYPE_UINT32, &vtnr,
 541                         DBUS_TYPE_INVALID);
 542         free(p);
 543
 544         if (!b) {
 545                 r = -ENOMEM;
 546                 goto fail;
 547         }
 548
 549         close_nointr_nofail(fifo_fd);
 550         *_reply = reply;
 551
 552         return 0;
 553
 554 fail:
 555         strv_free(controllers);
 556         strv_free(reset_controllers);
 557
 558         if (session)
 559                 session_add_to_gc_queue(session);
 560
 561         if (user)
 562                 user_add_to_gc_queue(user);
 563
 564         if (fifo_fd >= 0)
 565                 close_nointr_nofail(fifo_fd);
 566
 567         if (reply)
 568                 dbus_message_unref(reply);
 569
 570         return r;
 571 }
 572
 573 static int trigger_device(Manager *m, struct udev_device *d) {
 574         struct udev_enumerate *e;
 575         struct udev_list_entry *first, *item;
 576         int r;
 577
 578         assert(m);
 579
 580         e = udev_enumerate_new(m->udev);
 581         if (!e) {
 582                 r = -ENOMEM;
 583                 goto finish;
 584         }
 585
 586         if (d) {
 587                 if (udev_enumerate_add_match_parent(e, d) < 0) {
 588                         r = -EIO;
 589                         goto finish;
 590                 }
 591         }
 592
 593         if (udev_enumerate_scan_devices(e) < 0) {
 594                 r = -EIO;
 595                 goto finish;
 596         }
 597
 598         first = udev_enumerate_get_list_entry(e);
 599         udev_list_entry_foreach(item, first) {
 600                 char *t;
 601                 const char *p;
 602
 603                 p = udev_list_entry_get_name(item);
 604
 605                 t = strappend(p, "/uevent");
 606                 if (!t) {
 607                         r = -ENOMEM;
 608                         goto finish;
 609                 }
 610
 611                 write_one_line_file(t, "change");
 612                 free(t);
 613         }
 614
 615         r = 0;
 616
 617 finish:
 618         if (e)
 619                 udev_enumerate_unref(e);
 620
 621         return r;
 622 }
 623
 624 static int attach_device(Manager *m, const char *seat, const char *sysfs) {
 625         struct udev_device *d;
 626         char *rule = NULL, *file = NULL;
 627         const char *id_for_seat;
 628         int r;
 629
 630         assert(m);
 631         assert(seat);
 632         assert(sysfs);
 633
 634         d = udev_device_new_from_syspath(m->udev, sysfs);
 635         if (!d)
 636                 return -ENODEV;
 637
 638         if (!udev_device_has_tag(d, "seat")) {
 639                 r = -ENODEV;
 640                 goto finish;
 641         }
 642
 643         id_for_seat = udev_device_get_property_value(d, "ID_FOR_SEAT");
 644         if (!id_for_seat) {
 645                 r = -ENODEV;
 646                 goto finish;
 647         }
 648
 649         if (asprintf(&file, "/etc/udev/rules.d/72-seat-%s.rules", id_for_seat) < 0) {
 650                 r = -ENOMEM;
 651                 goto finish;
 652         }
 653
 654         if (asprintf(&rule, "TAG==\"seat\", ENV{ID_FOR_SEAT}==\"%s\", ENV{ID_SEAT}=\"%s\"", id_for_seat, seat) < 0) {
 655                 r = -ENOMEM;
 656                 goto finish;
 657         }
 658
 659         mkdir_p("/etc/udev/rules.d", 0755);
 660         r = write_one_line_file_atomic(file, rule);
 661         if (r < 0)
 662                 goto finish;
 663
 664         r = trigger_device(m, d);
 665
 666 finish:
 667         free(rule);
 668         free(file);
 669
 670         if (d)
 671                 udev_device_unref(d);
 672
 673         return r;
 674 }
 675
 676 static int flush_devices(Manager *m) {
 677         DIR *d;
 678
 679         assert(m);
 680
 681         d = opendir("/etc/udev/rules.d");
 682         if (!d) {
 683                 if (errno != ENOENT)
 684                         log_warning("Failed to open /etc/udev/rules.d: %m");
 685         } else {
 686                 struct dirent *de;
 687
 688                 while ((de = readdir(d))) {
 689
 690                         if (!dirent_is_file(de))
 691                                 continue;
 692
 693                         if (!startswith(de->d_name, "72-seat-"))
 694                                 continue;
 695
 696                         if (!endswith(de->d_name, ".rules"))
 697                                 continue;
 698
 699                         if (unlinkat(dirfd(d), de->d_name, 0) < 0)
 700                                 log_warning("Failed to unlink %s: %m", de->d_name);
 701                 }
 702
 703                 closedir(d);
 704         }
 705
 706         return trigger_device(m, NULL);
 707 }
 708
 709 static const BusProperty bus_login_manager_properties[] = {
 710         { "ControlGroupHierarchy",  bus_property_append_string,         "s",  offsetof(Manager, cgroup_path),        true },
 711         { "Controllers",            bus_property_append_strv,           "as", offsetof(Manager, controllers),        true },
 712         { "ResetControllers",       bus_property_append_strv,           "as", offsetof(Manager, reset_controllers),  true },
 713         { "NAutoVTs",               bus_property_append_unsigned,       "u",  offsetof(Manager, n_autovts)           },
 714         { "KillOnlyUsers",          bus_property_append_strv,           "as", offsetof(Manager, kill_only_users),    true },
 715         { "KillExcludeUsers",       bus_property_append_strv,           "as", offsetof(Manager, kill_exclude_users), true },
 716         { "KillUserProcesses",      bus_property_append_bool,           "b",  offsetof(Manager, kill_user_processes) },
 717         { "IdleHint",               bus_manager_append_idle_hint,       "b",  0 },
 718         { "IdleSinceHint",          bus_manager_append_idle_hint_since, "t",  0 },
 719         { "IdleSinceHintMonotonic", bus_manager_append_idle_hint_since, "t",  0 },
 720         { NULL, }
 721 };
 722
 723 static DBusHandlerResult manager_message_handler(
 724                 DBusConnection *connection,
 725                 DBusMessage *message,
 726                 void *userdata) {
 727
 728         Manager *m = userdata;
 729
 730         DBusError error;
 731         DBusMessage *reply = NULL;
 732         int r;
 733
 734         assert(connection);
 735         assert(message);
 736         assert(m);
 737
 738         dbus_error_init(&error);
 739
 740         if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "GetSession")) {
 741                 const char *name;
 742                 char *p;
 743                 Session *session;
 744                 bool b;
 745
 746                 if (!dbus_message_get_args(
 747                                     message,
 748                                     &error,
 749                                     DBUS_TYPE_STRING, &name,
 750                                     DBUS_TYPE_INVALID))
 751                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 752
 753                 session = hashmap_get(m->sessions, name);
 754                 if (!session)
 755                         return bus_send_error_reply(connection, message, &error, -ENOENT);
 756
 757                 reply = dbus_message_new_method_return(message);
 758                 if (!reply)
 759                         goto oom;
 760
 761                 p = session_bus_path(session);
 762                 if (!p)
 763                         goto oom;
 764
 765                 b = dbus_message_append_args(
 766                                 reply,
 767                                 DBUS_TYPE_OBJECT_PATH, &p,
 768                                 DBUS_TYPE_INVALID);
 769                 free(p);
 770
 771                 if (!b)
 772                         goto oom;
 773
 774         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "GetUser")) {
 775                 uint32_t uid;
 776                 char *p;
 777                 User *user;
 778                 bool b;
 779
 780                 if (!dbus_message_get_args(
 781                                     message,
 782                                     &error,
 783                                     DBUS_TYPE_UINT32, &uid,
 784                                     DBUS_TYPE_INVALID))
 785                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 786
 787                 user = hashmap_get(m->users, ULONG_TO_PTR((unsigned long) uid));
 788                 if (!user)
 789                         return bus_send_error_reply(connection, message, &error, -ENOENT);
 790
 791                 reply = dbus_message_new_method_return(message);
 792                 if (!reply)
 793                         goto oom;
 794
 795                 p = user_bus_path(user);
 796                 if (!p)
 797                         goto oom;
 798
 799                 b = dbus_message_append_args(
 800                                 reply,
 801                                 DBUS_TYPE_OBJECT_PATH, &p,
 802                                 DBUS_TYPE_INVALID);
 803                 free(p);
 804
 805                 if (!b)
 806                         goto oom;
 807
 808         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "GetSeat")) {
 809                 const char *name;
 810                 char *p;
 811                 Seat *seat;
 812                 bool b;
 813
 814                 if (!dbus_message_get_args(
 815                                     message,
 816                                     &error,
 817                                     DBUS_TYPE_STRING, &name,
 818                                     DBUS_TYPE_INVALID))
 819                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 820
 821                 seat = hashmap_get(m->seats, name);
 822                 if (!seat)
 823                         return bus_send_error_reply(connection, message, &error, -ENOENT);
 824
 825                 reply = dbus_message_new_method_return(message);
 826                 if (!reply)
 827                         goto oom;
 828
 829                 p = seat_bus_path(seat);
 830                 if (!p)
 831                         goto oom;
 832
 833                 b = dbus_message_append_args(
 834                                 reply,
 835                                 DBUS_TYPE_OBJECT_PATH, &p,
 836                                 DBUS_TYPE_INVALID);
 837                 free(p);
 838
 839                 if (!b)
 840                         goto oom;
 841
 842         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "ListSessions")) {
 843                 char *p;
 844                 Session *session;
 845                 Iterator i;
 846                 DBusMessageIter iter, sub;
 847                 const char *empty = "";
 848
 849                 reply = dbus_message_new_method_return(message);
 850                 if (!reply)
 851                         goto oom;
 852
 853                 dbus_message_iter_init_append(reply, &iter);
 854
 855                 if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "(susso)", &sub))
 856                         goto oom;
 857
 858                 HASHMAP_FOREACH(session, m->sessions, i) {
 859                         DBusMessageIter sub2;
 860                         uint32_t uid;
 861
 862                         if (!dbus_message_iter_open_container(&sub, DBUS_TYPE_STRUCT, NULL, &sub2))
 863                                 goto oom;
 864
 865                         uid = session->user->uid;
 866
 867                         p = session_bus_path(session);
 868                         if (!p)
 869                                 goto oom;
 870
 871                         if (!dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &session->id) ||
 872                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_UINT32, &uid) ||
 873                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &session->user->name) ||
 874                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, session->seat ? (const char**) &session->seat->id : &empty) ||
 875                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_OBJECT_PATH, &p)) {
 876                                 free(p);
 877                                 goto oom;
 878                         }
 879
 880                         free(p);
 881
 882                         if (!dbus_message_iter_close_container(&sub, &sub2))
 883                                 goto oom;
 884                 }
 885
 886                 if (!dbus_message_iter_close_container(&iter, &sub))
 887                         goto oom;
 888
 889         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "ListUsers")) {
 890                 char *p;
 891                 User *user;
 892                 Iterator i;
 893                 DBusMessageIter iter, sub;
 894
 895                 reply = dbus_message_new_method_return(message);
 896                 if (!reply)
 897                         goto oom;
 898
 899                 dbus_message_iter_init_append(reply, &iter);
 900
 901                 if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "(uso)", &sub))
 902                         goto oom;
 903
 904                 HASHMAP_FOREACH(user, m->users, i) {
 905                         DBusMessageIter sub2;
 906                         uint32_t uid;
 907
 908                         if (!dbus_message_iter_open_container(&sub, DBUS_TYPE_STRUCT, NULL, &sub2))
 909                                 goto oom;
 910
 911                         uid = user->uid;
 912
 913                         p = user_bus_path(user);
 914                         if (!p)
 915                                 goto oom;
 916
 917                         if (!dbus_message_iter_append_basic(&sub2, DBUS_TYPE_UINT32, &uid) ||
 918                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &user->name) ||
 919                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_OBJECT_PATH, &p)) {
 920                                 free(p);
 921                                 goto oom;
 922                         }
 923
 924                         free(p);
 925
 926                         if (!dbus_message_iter_close_container(&sub, &sub2))
 927                                 goto oom;
 928                 }
 929
 930                 if (!dbus_message_iter_close_container(&iter, &sub))
 931                         goto oom;
 932
 933         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "ListSeats")) {
 934                 char *p;
 935                 Seat *seat;
 936                 Iterator i;
 937                 DBusMessageIter iter, sub;
 938
 939                 reply = dbus_message_new_method_return(message);
 940                 if (!reply)
 941                         goto oom;
 942
 943                 dbus_message_iter_init_append(reply, &iter);
 944
 945                 if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "(so)", &sub))
 946                         goto oom;
 947
 948                 HASHMAP_FOREACH(seat, m->seats, i) {
 949                         DBusMessageIter sub2;
 950
 951                         if (!dbus_message_iter_open_container(&sub, DBUS_TYPE_STRUCT, NULL, &sub2))
 952                                 goto oom;
 953
 954                         p = seat_bus_path(seat);
 955                         if (!p)
 956                                 goto oom;
 957
 958                         if (!dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &seat->id) ||
 959                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_OBJECT_PATH, &p)) {
 960                                 free(p);
 961                                 goto oom;
 962                         }
 963
 964                         free(p);
 965
 966                         if (!dbus_message_iter_close_container(&sub, &sub2))
 967                                 goto oom;
 968                 }
 969
 970                 if (!dbus_message_iter_close_container(&iter, &sub))
 971                         goto oom;
 972
 973         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "CreateSession")) {
 974
 975                 r = bus_manager_create_session(m, message, &reply);
 976
 977                 /* Don't delay the work on OOM here, since it might be
 978                  * triggered by a low RLIMIT_NOFILE here (since we
 979                  * send a dupped fd to the client), and we'd rather
 980                  * see this fail quickly then be retried later */
 981
 982                 if (r < 0)
 983                         return bus_send_error_reply(connection, message, &error, r);
 984
 985         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "ActivateSession")) {
 986                 const char *name;
 987                 Session *session;
 988
 989                 if (!dbus_message_get_args(
 990                                     message,
 991                                     &error,
 992                                     DBUS_TYPE_STRING, &name,
 993                                     DBUS_TYPE_INVALID))
 994                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 995
 996                 session = hashmap_get(m->sessions, name);
 997                 if (!session)
 998                         return bus_send_error_reply(connection, message, &error, -ENOENT);
 999
1000                 r = session_activate(session);
1001                 if (r < 0)
1002                         return bus_send_error_reply(connection, message, NULL, r);
1003
1004                 reply = dbus_message_new_method_return(message);
1005                 if (!reply)
1006                         goto oom;
1007
1008         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "LockSession") ||
1009                    dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "UnlockSession")) {
1010                 const char *name;
1011                 Session *session;
1012
1013                 if (!dbus_message_get_args(
1014                                     message,
1015                                     &error,
1016                                     DBUS_TYPE_STRING, &name,
1017                                     DBUS_TYPE_INVALID))
1018                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1019
1020                 session = hashmap_get(m->sessions, name);
1021                 if (!session)
1022                         return bus_send_error_reply(connection, message, &error, -ENOENT);
1023
1024                 if (session_send_lock(session, streq(dbus_message_get_member(message), "LockSession")) < 0)
1025                         goto oom;
1026
1027                 reply = dbus_message_new_method_return(message);
1028                 if (!reply)
1029                         goto oom;
1030
1031         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "KillSession")) {
1032                 const char *swho;
1033                 int32_t signo;
1034                 KillWho who;
1035                 const char *name;
1036                 Session *session;
1037
1038                 if (!dbus_message_get_args(
1039                                     message,
1040                                     &error,
1041                                     DBUS_TYPE_STRING, &name,
1042                                     DBUS_TYPE_STRING, &swho,
1043                                     DBUS_TYPE_INT32, &signo,
1044                                     DBUS_TYPE_INVALID))
1045                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1046
1047                 if (isempty(swho))
1048                         who = KILL_ALL;
1049                 else {
1050                         who = kill_who_from_string(swho);
1051                         if (who < 0)
1052                                 return bus_send_error_reply(connection, message, &error, -EINVAL);
1053                 }
1054
1055                 if (signo <= 0 || signo >= _NSIG)
1056                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1057
1058                 session = hashmap_get(m->sessions, name);
1059                 if (!session)
1060                         return bus_send_error_reply(connection, message, &error, -ENOENT);
1061
1062                 r = session_kill(session, who, signo);
1063                 if (r < 0)
1064                         return bus_send_error_reply(connection, message, NULL, r);
1065
1066                 reply = dbus_message_new_method_return(message);
1067                 if (!reply)
1068                         goto oom;
1069
1070         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "KillUser")) {
1071                 uint32_t uid;
1072                 User *user;
1073                 int32_t signo;
1074
1075                 if (!dbus_message_get_args(
1076                                     message,
1077                                     &error,
1078                                     DBUS_TYPE_UINT32, &uid,
1079                                     DBUS_TYPE_INT32, &signo,
1080                                     DBUS_TYPE_INVALID))
1081                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1082
1083                 if (signo <= 0 || signo >= _NSIG)
1084                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1085
1086                 user = hashmap_get(m->users, ULONG_TO_PTR((unsigned long) uid));
1087                 if (!user)
1088                         return bus_send_error_reply(connection, message, &error, -ENOENT);
1089
1090                 r = user_kill(user, signo);
1091                 if (r < 0)
1092                         return bus_send_error_reply(connection, message, NULL, r);
1093
1094                 reply = dbus_message_new_method_return(message);
1095                 if (!reply)
1096                         goto oom;
1097
1098         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "TerminateSession")) {
1099                 const char *name;
1100                 Session *session;
1101
1102                 if (!dbus_message_get_args(
1103                                     message,
1104                                     &error,
1105                                     DBUS_TYPE_STRING, &name,
1106                                     DBUS_TYPE_INVALID))
1107                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1108
1109                 session = hashmap_get(m->sessions, name);
1110                 if (!session)
1111                         return bus_send_error_reply(connection, message, &error, -ENOENT);
1112
1113                 r = session_stop(session);
1114                 if (r < 0)
1115                         return bus_send_error_reply(connection, message, NULL, r);
1116
1117                 reply = dbus_message_new_method_return(message);
1118                 if (!reply)
1119                         goto oom;
1120
1121         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "TerminateUser")) {
1122                 uint32_t uid;
1123                 User *user;
1124
1125                 if (!dbus_message_get_args(
1126                                     message,
1127                                     &error,
1128                                     DBUS_TYPE_UINT32, &uid,
1129                                     DBUS_TYPE_INVALID))
1130                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1131
1132                 user = hashmap_get(m->users, ULONG_TO_PTR((unsigned long) uid));
1133                 if (!user)
1134                         return bus_send_error_reply(connection, message, &error, -ENOENT);
1135
1136                 r = user_stop(user);
1137                 if (r < 0)
1138                         return bus_send_error_reply(connection, message, NULL, r);
1139
1140                 reply = dbus_message_new_method_return(message);
1141                 if (!reply)
1142                         goto oom;
1143
1144         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "TerminateSeat")) {
1145                 const char *name;
1146                 Seat *seat;
1147
1148                 if (!dbus_message_get_args(
1149                                     message,
1150                                     &error,
1151                                     DBUS_TYPE_STRING, &name,
1152                                     DBUS_TYPE_INVALID))
1153                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1154
1155                 seat = hashmap_get(m->seats, name);
1156                 if (!seat)
1157                         return bus_send_error_reply(connection, message, &error, -ENOENT);
1158
1159                 r = seat_stop_sessions(seat);
1160                 if (r < 0)
1161                         return bus_send_error_reply(connection, message, NULL, r);
1162
1163                 reply = dbus_message_new_method_return(message);
1164                 if (!reply)
1165                         goto oom;
1166
1167         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "SetUserLinger")) {
1168                 uint32_t uid;
1169                 struct passwd *pw;
1170                 dbus_bool_t b, interactive;
1171                 char *path;
1172
1173                 if (!dbus_message_get_args(
1174                                     message,
1175                                     &error,
1176                                     DBUS_TYPE_UINT32, &uid,
1177                                     DBUS_TYPE_BOOLEAN, &b,
1178                                     DBUS_TYPE_BOOLEAN, &interactive,
1179                                     DBUS_TYPE_INVALID))
1180                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1181
1182                 errno = 0;
1183                 pw = getpwuid(uid);
1184                 if (!pw)
1185                         return bus_send_error_reply(connection, message, NULL, errno ? -errno : -EINVAL);
1186
1187                 r = verify_polkit(connection, message, "org.freedesktop.login1.set-user-linger", interactive, &error);
1188                 if (r < 0)
1189                         return bus_send_error_reply(connection, message, &error, r);
1190
1191                 mkdir_p("/var/lib/systemd", 0755);
1192
1193                 r = safe_mkdir("/var/lib/systemd/linger", 0755, 0, 0);
1194                 if (r < 0)
1195                         return bus_send_error_reply(connection, message, &error, r);
1196
1197                 path = strappend("/var/lib/systemd/linger/", pw->pw_name);
1198                 if (!path)
1199                         goto oom;
1200
1201                 if (b) {
1202                         User *u;
1203
1204                         r = touch(path);
1205                         free(path);
1206
1207                         if (r < 0)
1208                                 return bus_send_error_reply(connection, message, &error, r);
1209
1210                         if (manager_add_user_by_uid(m, uid, &u) >= 0)
1211                                 user_start(u);
1212
1213                 } else {
1214                         User *u;
1215
1216                         r = unlink(path);
1217                         free(path);
1218
1219                         if (r < 0 && errno != ENOENT)
1220                                 return bus_send_error_reply(connection, message, &error, -errno);
1221
1222                         u = hashmap_get(m->users, ULONG_TO_PTR((unsigned long) uid));
1223                         if (u)
1224                                 user_add_to_gc_queue(u);
1225                 }
1226
1227                 reply = dbus_message_new_method_return(message);
1228                 if (!reply)
1229                         goto oom;
1230
1231         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "AttachDevice")) {
1232                 const char *sysfs, *seat;
1233                 dbus_bool_t interactive;
1234
1235                 if (!dbus_message_get_args(
1236                                     message,
1237                                     &error,
1238                                     DBUS_TYPE_STRING, &seat,
1239                                     DBUS_TYPE_STRING, &sysfs,
1240                                     DBUS_TYPE_BOOLEAN, &interactive,
1241                                     DBUS_TYPE_INVALID))
1242                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1243
1244                 if (!path_startswith(sysfs, "/sys") || !seat_name_is_valid(seat))
1245                         return bus_send_error_reply(connection, message, NULL, -EINVAL);
1246
1247                 r = verify_polkit(connection, message, "org.freedesktop.login1.attach-device", interactive, &error);
1248                 if (r < 0)
1249                         return bus_send_error_reply(connection, message, &error, r);
1250
1251                 r = attach_device(m, seat, sysfs);
1252                 if (r < 0)
1253                         return bus_send_error_reply(connection, message, NULL, -EINVAL);
1254
1255                 reply = dbus_message_new_method_return(message);
1256                 if (!reply)
1257                         goto oom;
1258
1259
1260         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "FlushDevices")) {
1261                 dbus_bool_t interactive;
1262
1263                 if (!dbus_message_get_args(
1264                                     message,
1265                                     &error,
1266                                     DBUS_TYPE_BOOLEAN, &interactive,
1267                                     DBUS_TYPE_INVALID))
1268                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1269
1270                 r = verify_polkit(connection, message, "org.freedesktop.login1.flush-devices", interactive, &error);
1271                 if (r < 0)
1272                         return bus_send_error_reply(connection, message, &error, r);
1273
1274                 r = flush_devices(m);
1275                 if (r < 0)
1276                         return bus_send_error_reply(connection, message, NULL, -EINVAL);
1277
1278                 reply = dbus_message_new_method_return(message);
1279                 if (!reply)
1280                         goto oom;
1281
1282         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "PowerOff") ||
1283                    dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "Reboot")) {
1284                 dbus_bool_t interactive;
1285                 bool multiple_sessions;
1286                 DBusMessage *forward, *freply;
1287                 const char *name;
1288                 const char *mode = "replace";
1289                 const char *action;
1290
1291                 if (!dbus_message_get_args(
1292                                     message,
1293                                     &error,
1294                                     DBUS_TYPE_BOOLEAN, &interactive,
1295                                     DBUS_TYPE_INVALID))
1296                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1297
1298                 multiple_sessions = hashmap_size(m->sessions) > 1;
1299
1300                 if (!multiple_sessions) {
1301                         Session *s;
1302
1303                         /* Hmm, there's only one session, but let's
1304                          * make sure it actually belongs to the user
1305                          * who is asking. If not, better be safe than
1306                          * sorry. */
1307
1308                         s = hashmap_first(m->sessions);
1309                         if (s) {
1310                                 unsigned long ul;
1311
1312                                 ul = dbus_bus_get_unix_user(connection, dbus_message_get_sender(message), &error);
1313                                 if (ul == (unsigned long) -1)
1314                                         return bus_send_error_reply(connection, message, &error, -EIO);
1315
1316                                 multiple_sessions = s->user->uid != ul;
1317                         }
1318                 }
1319
1320                 if (streq(dbus_message_get_member(message), "PowerOff")) {
1321                         if (multiple_sessions)
1322                                 action = "org.freedesktop.login1.power-off-multiple-sessions";
1323                         else
1324                                 action = "org.freedesktop.login1.power-off";
1325
1326                         name = SPECIAL_POWEROFF_TARGET;
1327                 } else {
1328                         if (multiple_sessions)
1329                                 action = "org.freedesktop.login1.reboot-multiple-sessions";
1330                         else
1331                                 action = "org.freedesktop.login1.reboot";
1332
1333                         name = SPECIAL_REBOOT_TARGET;
1334                 }
1335
1336                 r = verify_polkit(connection, message, action, interactive, &error);
1337                 if (r < 0)
1338                         return bus_send_error_reply(connection, message, &error, r);
1339
1340                 forward = dbus_message_new_method_call(
1341                               "org.freedesktop.systemd1",
1342                               "/org/freedesktop/systemd1",
1343                               "org.freedesktop.systemd1.Manager",
1344                               "StartUnit");
1345                 if (!forward)
1346                         return bus_send_error_reply(connection, message, NULL, -ENOMEM);
1347
1348                 if (!dbus_message_append_args(forward,
1349                                               DBUS_TYPE_STRING, &name,
1350                                               DBUS_TYPE_STRING, &mode,
1351                                               DBUS_TYPE_INVALID)) {
1352                         dbus_message_unref(forward);
1353                         return bus_send_error_reply(connection, message, NULL, -ENOMEM);
1354                 }
1355
1356                 freply = dbus_connection_send_with_reply_and_block(connection, forward, -1, &error);
1357                 dbus_message_unref(forward);
1358
1359                 if (!freply)
1360                         return bus_send_error_reply(connection, message, &error, -EIO);
1361
1362                 dbus_message_unref(freply);
1363
1364                 reply = dbus_message_new_method_return(message);
1365                 if (!reply)
1366                         goto oom;
1367
1368         } else if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Introspectable", "Introspect")) {
1369                 char *introspection = NULL;
1370                 FILE *f;
1371                 Iterator i;
1372                 Session *session;
1373                 Seat *seat;
1374                 User *user;
1375                 size_t size;
1376                 char *p;
1377
1378                 if (!(reply = dbus_message_new_method_return(message)))
1379                         goto oom;
1380
1381                 /* We roll our own introspection code here, instead of
1382                  * relying on bus_default_message_handler() because we
1383                  * need to generate our introspection string
1384                  * dynamically. */
1385
1386                 if (!(f = open_memstream(&introspection, &size)))
1387                         goto oom;
1388
1389                 fputs(INTROSPECTION_BEGIN, f);
1390
1391                 HASHMAP_FOREACH(seat, m->seats, i) {
1392                         p = bus_path_escape(seat->id);
1393
1394                         if (p) {
1395                                 fprintf(f, "<node name=\"seat/%s\"/>", p);
1396                                 free(p);
1397                         }
1398                 }
1399
1400                 HASHMAP_FOREACH(user, m->users, i)
1401                         fprintf(f, "<node name=\"user/%llu\"/>", (unsigned long long) user->uid);
1402
1403                 HASHMAP_FOREACH(session, m->sessions, i) {
1404                         p = bus_path_escape(session->id);
1405
1406                         if (p) {
1407                                 fprintf(f, "<node name=\"session/%s\"/>", p);
1408                                 free(p);
1409                         }
1410                 }
1411
1412                 fputs(INTROSPECTION_END, f);
1413
1414                 if (ferror(f)) {
1415                         fclose(f);
1416                         free(introspection);
1417                         goto oom;
1418                 }
1419
1420                 fclose(f);
1421
1422                 if (!introspection)
1423                         goto oom;
1424
1425                 if (!dbus_message_append_args(reply, DBUS_TYPE_STRING, &introspection, DBUS_TYPE_INVALID)) {
1426                         free(introspection);
1427                         goto oom;
1428                 }
1429
1430                 free(introspection);
1431         } else {
1432                 const BusBoundProperties bps[] = {
1433                         { "org.freedesktop.login1.Manager", bus_login_manager_properties, m },
1434                         { NULL, }
1435                 };
1436                 return bus_default_message_handler(connection, message, NULL, INTERFACES_LIST, bps);
1437         }
1438
1439         if (reply) {
1440                 if (!dbus_connection_send(connection, reply, NULL))
1441                         goto oom;
1442
1443                 dbus_message_unref(reply);
1444         }
1445
1446         return DBUS_HANDLER_RESULT_HANDLED;
1447
1448 oom:
1449         if (reply)
1450                 dbus_message_unref(reply);
1451
1452         dbus_error_free(&error);
1453
1454         return DBUS_HANDLER_RESULT_NEED_MEMORY;
1455 }
1456
1457 const DBusObjectPathVTable bus_manager_vtable = {
1458         .message_function = manager_message_handler
1459 };
1460
1461 DBusHandlerResult bus_message_filter(
1462                 DBusConnection *connection,
1463                 DBusMessage *message,
1464                 void *userdata) {
1465
1466         Manager *m = userdata;
1467         DBusError error;
1468
1469         assert(m);
1470         assert(connection);
1471         assert(message);
1472
1473         dbus_error_init(&error);
1474
1475         if (dbus_message_is_signal(message, "org.freedesktop.systemd1.Agent", "Released")) {
1476                 const char *cgroup;
1477
1478                 if (!dbus_message_get_args(message, &error,
1479                                            DBUS_TYPE_STRING, &cgroup,
1480                                            DBUS_TYPE_INVALID))
1481                         log_error("Failed to parse Released message: %s", bus_error_message(&error));
1482                 else
1483                         manager_cgroup_notify_empty(m, cgroup);
1484         }
1485
1486         dbus_error_free(&error);
1487
1488         return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
1489 }
1490
1491 int manager_send_changed(Manager *manager, const char *properties) {
1492         DBusMessage *m;
1493         int r = -ENOMEM;
1494
1495         assert(manager);
1496
1497         m = bus_properties_changed_new("/org/freedesktop/login1", "org.freedesktop.login1.Manager", properties);
1498         if (!m)
1499                 goto finish;
1500
1501         if (!dbus_connection_send(manager->bus, m, NULL))
1502                 goto finish;
1503
1504         r = 0;
1505
1506 finish:
1507         if (m)
1508                 dbus_message_unref(m);
1509
1510         return r;
1511 }