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=\"GetSessionByPID\">\n"                         \
  40         "   <arg name=\"pid\" type=\"u\" direction=\"in\"/>\n"          \
  41         "   <arg name=\"session\" type=\"o\" direction=\"out\"/>\n"     \
  42         "  </method>\n"                                                 \
  43         "  <method name=\"GetUser\">\n"                                 \
  44         "   <arg name=\"uid\" type=\"u\" direction=\"in\"/>\n"          \
  45         "   <arg name=\"user\" type=\"o\" direction=\"out\"/>\n"        \
  46         "  </method>\n"                                                 \
  47         "  <method name=\"GetSeat\">\n"                                 \
  48         "   <arg name=\"id\" type=\"s\" direction=\"in\"/>\n"           \
  49         "   <arg name=\"seat\" type=\"o\" direction=\"out\"/>\n"        \
  50         "  </method>\n"                                                 \
  51         "  <method name=\"ListSessions\">\n"                            \
  52         "   <arg name=\"sessions\" type=\"a(susso)\" direction=\"out\"/>\n" \
  53         "  </method>\n"                                                 \
  54         "  <method name=\"ListUsers\">\n"                               \
  55         "   <arg name=\"users\" type=\"a(uso)\" direction=\"out\"/>\n"  \
  56         "  </method>\n"                                                 \
  57         "  <method name=\"ListSeats\">\n"                               \
  58         "   <arg name=\"seats\" type=\"a(so)\" direction=\"out\"/>\n"   \
  59         "  </method>\n"                                                 \
  60         "  <method name=\"CreateSession\">\n"                           \
  61         "   <arg name=\"uid\" type=\"u\" direction=\"in\"/>\n"          \
  62         "   <arg name=\"leader\" type=\"u\" direction=\"in\"/>\n"       \
  63         "   <arg name=\"sevice\" type=\"s\" direction=\"in\"/>\n"       \
  64         "   <arg name=\"type\" type=\"s\" direction=\"in\"/>\n"         \
  65         "   <arg name=\"seat\" type=\"s\" direction=\"in\"/>\n"         \
  66         "   <arg name=\"vtnr\" type=\"u\" direction=\"in\"/>\n"         \
  67         "   <arg name=\"tty\" type=\"s\" direction=\"in\"/>\n"          \
  68         "   <arg name=\"display\" type=\"s\" direction=\"in\"/>\n"      \
  69         "   <arg name=\"remote\" type=\"b\" direction=\"in\"/>\n"       \
  70         "   <arg name=\"remote_user\" type=\"s\" direction=\"in\"/>\n"  \
  71         "   <arg name=\"remote_host\" type=\"s\" direction=\"in\"/>\n"  \
  72         "   <arg name=\"controllers\" type=\"as\" direction=\"in\"/>\n" \
  73         "   <arg name=\"reset_controllers\" type=\"as\" direction=\"in\"/>\n" \
  74         "   <arg name=\"kill_processes\" type=\"b\" direction=\"in\"/>\n" \
  75         "   <arg name=\"id\" type=\"s\" direction=\"out\"/>\n"          \
  76         "   <arg name=\"path\" type=\"o\" direction=\"out\"/>\n"        \
  77         "   <arg name=\"runtime_path\" type=\"o\" direction=\"out\"/>\n" \
  78         "   <arg name=\"fd\" type=\"h\" direction=\"out\"/>\n"          \
  79         "   <arg name=\"seat\" type=\"s\" direction=\"out\"/>\n"        \
  80         "   <arg name=\"vtnr\" type=\"u\" direction=\"out\"/>\n"        \
  81         "  </method>\n"                                                 \
  82         "  <method name=\"ActivateSession\">\n"                         \
  83         "   <arg name=\"id\" type=\"s\" direction=\"in\"/>\n"           \
  84         "  </method>\n"                                                 \
  85         "  <method name=\"LockSession\">\n"                             \
  86         "   <arg name=\"id\" type=\"s\" direction=\"in\"/>\n"           \
  87         "  </method>\n"                                                 \
  88         "  <method name=\"UnlockSession\">\n"                           \
  89         "   <arg name=\"id\" type=\"s\" direction=\"in\"/>\n"           \
  90         "  </method>\n"                                                 \
  91         "  <method name=\"KillSession\">\n"                             \
  92         "   <arg name=\"id\" type=\"s\" direction=\"in\"/>\n"           \
  93         "   <arg name=\"who\" type=\"s\"/>\n"                           \
  94         "   <arg name=\"signal\" type=\"s\"/>\n"                        \
  95         "  </method>\n"                                                 \
  96         "  <method name=\"KillUser\">\n"                                \
  97         "   <arg name=\"uid\" type=\"u\" direction=\"in\"/>\n"          \
  98         "   <arg name=\"signal\" type=\"s\"/>\n"                        \
  99         "  </method>\n"                                                 \
 100         "  <method name=\"TerminateSession\">\n"                        \
 101         "   <arg name=\"id\" type=\"s\" direction=\"in\"/>\n"           \
 102         "  </method>\n"                                                 \
 103         "  <method name=\"TerminateUser\">\n"                           \
 104         "   <arg name=\"uid\" type=\"u\" direction=\"in\"/>\n"          \
 105         "  </method>\n"                                                 \
 106         "  <method name=\"TerminateSeat\">\n"                           \
 107         "   <arg name=\"id\" type=\"s\" direction=\"in\"/>\n"           \
 108         "  </method>\n"                                                 \
 109         "  <method name=\"SetUserLinger\">\n"                           \
 110         "   <arg name=\"uid\" type=\"u\" direction=\"in\"/>\n"          \
 111         "   <arg name=\"b\" type=\"b\" direction=\"in\"/>\n"            \
 112         "   <arg name=\"interactive\" type=\"b\" direction=\"in\"/>\n"  \
 113         "  </method>\n"                                                 \
 114         "  <method name=\"AttachDevice\">\n"                            \
 115         "   <arg name=\"seat\" type=\"s\" direction=\"in\"/>\n"         \
 116         "   <arg name=\"sysfs\" type=\"s\" direction=\"in\"/>\n"        \
 117         "   <arg name=\"interactive\" type=\"b\" direction=\"in\"/>\n"  \
 118         "  </method>\n"                                                 \
 119         "  <method name=\"FlushDevices\">\n"                            \
 120         "   <arg name=\"interactive\" type=\"b\" direction=\"in\"/>\n"  \
 121         "  </method>\n"                                                 \
 122         "  <method name=\"PowerOff\">\n"                                \
 123         "   <arg name=\"interactive\" type=\"b\" direction=\"in\"/>\n"  \
 124         "  </method>\n"                                                 \
 125         "  <method name=\"Reboot\">\n"                                  \
 126         "   <arg name=\"interactive\" type=\"b\" direction=\"in\"/>\n"  \
 127         "  </method>\n"                                                 \
 128         "  <signal name=\"SessionNew\">\n"                              \
 129         "   <arg name=\"id\" type=\"s\"/>\n"                            \
 130         "   <arg name=\"path\" type=\"o\"/>\n"                          \
 131         "  </signal>\n"                                                 \
 132         "  <signal name=\"SessionRemoved\">\n"                          \
 133         "   <arg name=\"id\" type=\"s\"/>\n"                            \
 134         "   <arg name=\"path\" type=\"o\"/>\n"                          \
 135         "  </signal>\n"                                                 \
 136         "  <signal name=\"UserNew\">\n"                                 \
 137         "   <arg name=\"uid\" type=\"u\"/>\n"                           \
 138         "   <arg name=\"path\" type=\"o\"/>\n"                          \
 139         "  </signal>\n"                                                 \
 140         "  <signal name=\"UserRemoved\">\n"                             \
 141         "   <arg name=\"uid\" type=\"u\"/>\n"                           \
 142         "   <arg name=\"path\" type=\"o\"/>\n"                          \
 143         "  </signal>\n"                                                 \
 144         "  <signal name=\"SeatNew\">\n"                                 \
 145         "   <arg name=\"id\" type=\"s\"/>\n"                            \
 146         "   <arg name=\"path\" type=\"o\"/>\n"                          \
 147         "  </signal>\n"                                                 \
 148         "  <signal name=\"SeatRemoved\">\n"                             \
 149         "   <arg name=\"id\" type=\"s\"/>\n"                            \
 150         "   <arg name=\"path\" type=\"o\"/>\n"                          \
 151         "  </signal>\n"                                                 \
 152         "  <property name=\"ControlGroupHierarchy\" type=\"s\" access=\"read\"/>\n" \
 153         "  <property name=\"Controllers\" type=\"as\" access=\"read\"/>\n" \
 154         "  <property name=\"ResetControllers\" type=\"as\" access=\"read\"/>\n" \
 155         "  <property name=\"NAutoVTs\" type=\"u\" access=\"read\"/>\n" \
 156         "  <property name=\"KillOnlyUsers\" type=\"as\" access=\"read\"/>\n" \
 157         "  <property name=\"KillExcludeUsers\" type=\"as\" access=\"read\"/>\n" \
 158         "  <property name=\"KillUserProcesses\" type=\"b\" access=\"read\"/>\n" \
 159         "  <property name=\"IdleHint\" type=\"b\" access=\"read\"/>\n"  \
 160         "  <property name=\"IdleSinceHint\" type=\"t\" access=\"read\"/>\n" \
 161         "  <property name=\"IdleSinceHintMonotonic\" type=\"t\" access=\"read\"/>\n" \
 162         " </interface>\n"
 163
 164 #define INTROSPECTION_BEGIN                                             \
 165         DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE                       \
 166         "<node>\n"                                                      \
 167         BUS_MANAGER_INTERFACE                                           \
 168         BUS_PROPERTIES_INTERFACE                                        \
 169         BUS_PEER_INTERFACE                                              \
 170         BUS_INTROSPECTABLE_INTERFACE
 171
 172 #define INTROSPECTION_END                                               \
 173         "</node>\n"
 174
 175 #define INTERFACES_LIST                              \
 176         BUS_GENERIC_INTERFACES_LIST                  \
 177         "org.freedesktop.login1.Manager\0"
 178
 179 static int bus_manager_append_idle_hint(DBusMessageIter *i, const char *property, void *data) {
 180         Manager *m = data;
 181         dbus_bool_t b;
 182
 183         assert(i);
 184         assert(property);
 185         assert(m);
 186
 187         b = manager_get_idle_hint(m, NULL) > 0;
 188         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &b))
 189                 return -ENOMEM;
 190
 191         return 0;
 192 }
 193
 194 static int bus_manager_append_idle_hint_since(DBusMessageIter *i, const char *property, void *data) {
 195         Manager *m = data;
 196         dual_timestamp t;
 197         uint64_t u;
 198
 199         assert(i);
 200         assert(property);
 201         assert(m);
 202
 203         manager_get_idle_hint(m, &t);
 204         u = streq(property, "IdleSinceHint") ? t.realtime : t.monotonic;
 205
 206         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_UINT64, &u))
 207                 return -ENOMEM;
 208
 209         return 0;
 210 }
 211
 212 static int bus_manager_create_session(Manager *m, DBusMessage *message, DBusMessage **_reply) {
 213         Session *session = NULL;
 214         User *user = NULL;
 215         const char *type, *seat, *tty, *display, *remote_user, *remote_host, *service;
 216         uint32_t uid, leader, audit_id = 0;
 217         dbus_bool_t remote, kill_processes;
 218         char **controllers = NULL, **reset_controllers = NULL;
 219         SessionType t;
 220         Seat *s;
 221         DBusMessageIter iter;
 222         int r;
 223         char *id = NULL, *p;
 224         uint32_t vtnr = 0;
 225         int fifo_fd = -1;
 226         DBusMessage *reply = NULL;
 227         bool b;
 228
 229         assert(m);
 230         assert(message);
 231         assert(_reply);
 232
 233         if (!dbus_message_iter_init(message, &iter) ||
 234             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_UINT32)
 235                 return -EINVAL;
 236
 237         dbus_message_iter_get_basic(&iter, &uid);
 238
 239         if (!dbus_message_iter_next(&iter) ||
 240             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_UINT32)
 241                 return -EINVAL;
 242
 243         dbus_message_iter_get_basic(&iter, &leader);
 244
 245         if (leader <= 0 ||
 246             !dbus_message_iter_next(&iter) ||
 247             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING)
 248                 return -EINVAL;
 249
 250         dbus_message_iter_get_basic(&iter, &service);
 251
 252         if (!dbus_message_iter_next(&iter) ||
 253             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING)
 254                 return -EINVAL;
 255
 256         dbus_message_iter_get_basic(&iter, &type);
 257         t = session_type_from_string(type);
 258
 259         if (t < 0 ||
 260             !dbus_message_iter_next(&iter) ||
 261             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING)
 262                 return -EINVAL;
 263
 264         dbus_message_iter_get_basic(&iter, &seat);
 265
 266         if (isempty(seat))
 267                 s = NULL;
 268         else {
 269                 s = hashmap_get(m->seats, seat);
 270                 if (!s)
 271                         return -ENOENT;
 272         }
 273
 274         if (!dbus_message_iter_next(&iter) ||
 275             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_UINT32)
 276                 return -EINVAL;
 277
 278         dbus_message_iter_get_basic(&iter, &vtnr);
 279
 280         if (!dbus_message_iter_next(&iter) ||
 281             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING)
 282                 return -EINVAL;
 283
 284         dbus_message_iter_get_basic(&iter, &tty);
 285
 286         if (tty_is_vc(tty)) {
 287                 int v;
 288
 289                 if (!s)
 290                         s = m->vtconsole;
 291                 else if (s != m->vtconsole)
 292                         return -EINVAL;
 293
 294                 v = vtnr_from_tty(tty);
 295
 296                 if (v <= 0)
 297                         return v < 0 ? v : -EINVAL;
 298
 299                 if (vtnr <= 0)
 300                         vtnr = (uint32_t) v;
 301                 else if (vtnr != (uint32_t) v)
 302                         return -EINVAL;
 303
 304         } else if (!isempty(tty) && s && seat_is_vtconsole(s))
 305                 return -EINVAL;
 306
 307         if (s) {
 308                 if (seat_can_multi_session(s)) {
 309                         if (vtnr <= 0 || vtnr > 63)
 310                                 return -EINVAL;
 311                 } else {
 312                         if (vtnr > 0)
 313                                 return -EINVAL;
 314                 }
 315         }
 316
 317         if (!dbus_message_iter_next(&iter) ||
 318             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING)
 319                 return -EINVAL;
 320
 321         dbus_message_iter_get_basic(&iter, &display);
 322
 323         if (!dbus_message_iter_next(&iter) ||
 324             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_BOOLEAN)
 325                 return -EINVAL;
 326
 327         dbus_message_iter_get_basic(&iter, &remote);
 328
 329         if (!dbus_message_iter_next(&iter) ||
 330             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING)
 331                 return -EINVAL;
 332
 333         dbus_message_iter_get_basic(&iter, &remote_user);
 334
 335         if (!dbus_message_iter_next(&iter) ||
 336             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING)
 337                 return -EINVAL;
 338
 339         dbus_message_iter_get_basic(&iter, &remote_host);
 340
 341         if (!dbus_message_iter_next(&iter) ||
 342             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_ARRAY ||
 343             dbus_message_iter_get_element_type(&iter) != DBUS_TYPE_STRING)
 344                 return -EINVAL;
 345
 346         r = bus_parse_strv_iter(&iter, &controllers);
 347         if (r < 0)
 348                 return -EINVAL;
 349
 350         if (strv_contains(controllers, "systemd") ||
 351             !dbus_message_iter_next(&iter) ||
 352             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_ARRAY ||
 353             dbus_message_iter_get_element_type(&iter) != DBUS_TYPE_STRING) {
 354                 r = -EINVAL;
 355                 goto fail;
 356         }
 357
 358         r = bus_parse_strv_iter(&iter, &reset_controllers);
 359         if (r < 0)
 360                 goto fail;
 361
 362         if (strv_contains(reset_controllers, "systemd") ||
 363             !dbus_message_iter_next(&iter) ||
 364             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_BOOLEAN) {
 365                 r = -EINVAL;
 366                 goto fail;
 367         }
 368
 369         dbus_message_iter_get_basic(&iter, &kill_processes);
 370
 371         r = manager_add_user_by_uid(m, uid, &user);
 372         if (r < 0)
 373                 goto fail;
 374
 375         audit_session_from_pid(leader, &audit_id);
 376
 377         if (audit_id > 0) {
 378                 asprintf(&id, "%lu", (unsigned long) audit_id);
 379
 380                 if (!id) {
 381                         r = -ENOMEM;
 382                         goto fail;
 383                 }
 384
 385                 session = hashmap_get(m->sessions, id);
 386
 387                 if (session) {
 388                         free(id);
 389
 390                         fifo_fd = session_create_fifo(session);
 391                         if (fifo_fd < 0) {
 392                                 r = fifo_fd;
 393                                 goto fail;
 394                         }
 395
 396                         /* Session already exists, client is probably
 397                          * something like "su" which changes uid but
 398                          * is still the same audit session */
 399
 400                         reply = dbus_message_new_method_return(message);
 401                         if (!reply) {
 402                                 r = -ENOMEM;
 403                                 goto fail;
 404                         }
 405
 406                         p = session_bus_path(session);
 407                         if (!p) {
 408                                 r = -ENOMEM;
 409                                 goto fail;
 410                         }
 411
 412                         seat = session->seat ? session->seat->id : "";
 413                         vtnr = session->vtnr;
 414                         b = dbus_message_append_args(
 415                                         reply,
 416                                         DBUS_TYPE_STRING, &session->id,
 417                                         DBUS_TYPE_OBJECT_PATH, &p,
 418                                         DBUS_TYPE_STRING, &session->user->runtime_path,
 419                                         DBUS_TYPE_UNIX_FD, &fifo_fd,
 420                                         DBUS_TYPE_STRING, &seat,
 421                                         DBUS_TYPE_UINT32, &vtnr,
 422                                         DBUS_TYPE_INVALID);
 423                         free(p);
 424
 425                         if (!b) {
 426                                 r = -ENOMEM;
 427                                 goto fail;
 428                         }
 429
 430                         close_nointr_nofail(fifo_fd);
 431                         *_reply = reply;
 432
 433                         strv_free(controllers);
 434                         strv_free(reset_controllers);
 435
 436                         return 0;
 437                 }
 438
 439         } else {
 440                 do {
 441                         free(id);
 442                         asprintf(&id, "c%lu", ++m->session_counter);
 443
 444                         if (!id) {
 445                                 r = -ENOMEM;
 446                                 goto fail;
 447                         }
 448
 449                 } while (hashmap_get(m->sessions, id));
 450         }
 451
 452         r = manager_add_session(m, user, id, &session);
 453         free(id);
 454         if (r < 0)
 455                 goto fail;
 456
 457         session->leader = leader;
 458         session->audit_id = audit_id;
 459         session->type = t;
 460         session->remote = remote;
 461         session->controllers = controllers;
 462         session->reset_controllers = reset_controllers;
 463         session->kill_processes = kill_processes;
 464         session->vtnr = vtnr;
 465
 466         controllers = reset_controllers = NULL;
 467
 468         if (!isempty(tty)) {
 469                 session->tty = strdup(tty);
 470                 if (!session->tty) {
 471                         r = -ENOMEM;
 472                         goto fail;
 473                 }
 474         }
 475
 476         if (!isempty(display)) {
 477                 session->display = strdup(display);
 478                 if (!session->display) {
 479                         r = -ENOMEM;
 480                         goto fail;
 481                 }
 482         }
 483
 484         if (!isempty(remote_user)) {
 485                 session->remote_user = strdup(remote_user);
 486                 if (!session->remote_user) {
 487                         r = -ENOMEM;
 488                         goto fail;
 489                 }
 490         }
 491
 492         if (!isempty(remote_host)) {
 493                 session->remote_host = strdup(remote_host);
 494                 if (!session->remote_host) {
 495                         r = -ENOMEM;
 496                         goto fail;
 497                 }
 498         }
 499
 500         if (!isempty(service)) {
 501                 session->service = strdup(service);
 502                 if (!session->service) {
 503                         r = -ENOMEM;
 504                         goto fail;
 505                 }
 506         }
 507
 508         fifo_fd = session_create_fifo(session);
 509         if (fifo_fd < 0) {
 510                 r = fifo_fd;
 511                 goto fail;
 512         }
 513
 514         if (s) {
 515                 r = seat_attach_session(s, session);
 516                 if (r < 0)
 517                         goto fail;
 518         }
 519
 520         r = session_start(session);
 521         if (r < 0)
 522                 goto fail;
 523
 524         reply = dbus_message_new_method_return(message);
 525         if (!reply) {
 526                 r = -ENOMEM;
 527                 goto fail;
 528         }
 529
 530         p = session_bus_path(session);
 531         if (!p) {
 532                 r = -ENOMEM;
 533                 goto fail;
 534         }
 535
 536         seat = s ? s->id : "";
 537         b = dbus_message_append_args(
 538                         reply,
 539                         DBUS_TYPE_STRING, &session->id,
 540                         DBUS_TYPE_OBJECT_PATH, &p,
 541                         DBUS_TYPE_STRING, &session->user->runtime_path,
 542                         DBUS_TYPE_UNIX_FD, &fifo_fd,
 543                         DBUS_TYPE_STRING, &seat,
 544                         DBUS_TYPE_UINT32, &vtnr,
 545                         DBUS_TYPE_INVALID);
 546         free(p);
 547
 548         if (!b) {
 549                 r = -ENOMEM;
 550                 goto fail;
 551         }
 552
 553         close_nointr_nofail(fifo_fd);
 554         *_reply = reply;
 555
 556         return 0;
 557
 558 fail:
 559         strv_free(controllers);
 560         strv_free(reset_controllers);
 561
 562         if (session)
 563                 session_add_to_gc_queue(session);
 564
 565         if (user)
 566                 user_add_to_gc_queue(user);
 567
 568         if (fifo_fd >= 0)
 569                 close_nointr_nofail(fifo_fd);
 570
 571         if (reply)
 572                 dbus_message_unref(reply);
 573
 574         return r;
 575 }
 576
 577 static int trigger_device(Manager *m, struct udev_device *d) {
 578         struct udev_enumerate *e;
 579         struct udev_list_entry *first, *item;
 580         int r;
 581
 582         assert(m);
 583
 584         e = udev_enumerate_new(m->udev);
 585         if (!e) {
 586                 r = -ENOMEM;
 587                 goto finish;
 588         }
 589
 590         if (d) {
 591                 if (udev_enumerate_add_match_parent(e, d) < 0) {
 592                         r = -EIO;
 593                         goto finish;
 594                 }
 595         }
 596
 597         if (udev_enumerate_scan_devices(e) < 0) {
 598                 r = -EIO;
 599                 goto finish;
 600         }
 601
 602         first = udev_enumerate_get_list_entry(e);
 603         udev_list_entry_foreach(item, first) {
 604                 char *t;
 605                 const char *p;
 606
 607                 p = udev_list_entry_get_name(item);
 608
 609                 t = strappend(p, "/uevent");
 610                 if (!t) {
 611                         r = -ENOMEM;
 612                         goto finish;
 613                 }
 614
 615                 write_one_line_file(t, "change");
 616                 free(t);
 617         }
 618
 619         r = 0;
 620
 621 finish:
 622         if (e)
 623                 udev_enumerate_unref(e);
 624
 625         return r;
 626 }
 627
 628 static int attach_device(Manager *m, const char *seat, const char *sysfs) {
 629         struct udev_device *d;
 630         char *rule = NULL, *file = NULL;
 631         const char *id_for_seat;
 632         int r;
 633
 634         assert(m);
 635         assert(seat);
 636         assert(sysfs);
 637
 638         d = udev_device_new_from_syspath(m->udev, sysfs);
 639         if (!d)
 640                 return -ENODEV;
 641
 642         if (!udev_device_has_tag(d, "seat")) {
 643                 r = -ENODEV;
 644                 goto finish;
 645         }
 646
 647         id_for_seat = udev_device_get_property_value(d, "ID_FOR_SEAT");
 648         if (!id_for_seat) {
 649                 r = -ENODEV;
 650                 goto finish;
 651         }
 652
 653         if (asprintf(&file, "/etc/udev/rules.d/72-seat-%s.rules", id_for_seat) < 0) {
 654                 r = -ENOMEM;
 655                 goto finish;
 656         }
 657
 658         if (asprintf(&rule, "TAG==\"seat\", ENV{ID_FOR_SEAT}==\"%s\", ENV{ID_SEAT}=\"%s\"", id_for_seat, seat) < 0) {
 659                 r = -ENOMEM;
 660                 goto finish;
 661         }
 662
 663         mkdir_p("/etc/udev/rules.d", 0755);
 664         r = write_one_line_file_atomic(file, rule);
 665         if (r < 0)
 666                 goto finish;
 667
 668         r = trigger_device(m, d);
 669
 670 finish:
 671         free(rule);
 672         free(file);
 673
 674         if (d)
 675                 udev_device_unref(d);
 676
 677         return r;
 678 }
 679
 680 static int flush_devices(Manager *m) {
 681         DIR *d;
 682
 683         assert(m);
 684
 685         d = opendir("/etc/udev/rules.d");
 686         if (!d) {
 687                 if (errno != ENOENT)
 688                         log_warning("Failed to open /etc/udev/rules.d: %m");
 689         } else {
 690                 struct dirent *de;
 691
 692                 while ((de = readdir(d))) {
 693
 694                         if (!dirent_is_file(de))
 695                                 continue;
 696
 697                         if (!startswith(de->d_name, "72-seat-"))
 698                                 continue;
 699
 700                         if (!endswith(de->d_name, ".rules"))
 701                                 continue;
 702
 703                         if (unlinkat(dirfd(d), de->d_name, 0) < 0)
 704                                 log_warning("Failed to unlink %s: %m", de->d_name);
 705                 }
 706
 707                 closedir(d);
 708         }
 709
 710         return trigger_device(m, NULL);
 711 }
 712
 713 static const BusProperty bus_login_manager_properties[] = {
 714         { "ControlGroupHierarchy",  bus_property_append_string,         "s",  offsetof(Manager, cgroup_path),        true },
 715         { "Controllers",            bus_property_append_strv,           "as", offsetof(Manager, controllers),        true },
 716         { "ResetControllers",       bus_property_append_strv,           "as", offsetof(Manager, reset_controllers),  true },
 717         { "NAutoVTs",               bus_property_append_unsigned,       "u",  offsetof(Manager, n_autovts)           },
 718         { "KillOnlyUsers",          bus_property_append_strv,           "as", offsetof(Manager, kill_only_users),    true },
 719         { "KillExcludeUsers",       bus_property_append_strv,           "as", offsetof(Manager, kill_exclude_users), true },
 720         { "KillUserProcesses",      bus_property_append_bool,           "b",  offsetof(Manager, kill_user_processes) },
 721         { "IdleHint",               bus_manager_append_idle_hint,       "b",  0 },
 722         { "IdleSinceHint",          bus_manager_append_idle_hint_since, "t",  0 },
 723         { "IdleSinceHintMonotonic", bus_manager_append_idle_hint_since, "t",  0 },
 724         { NULL, }
 725 };
 726
 727 static DBusHandlerResult manager_message_handler(
 728                 DBusConnection *connection,
 729                 DBusMessage *message,
 730                 void *userdata) {
 731
 732         Manager *m = userdata;
 733
 734         DBusError error;
 735         DBusMessage *reply = NULL;
 736         int r;
 737
 738         assert(connection);
 739         assert(message);
 740         assert(m);
 741
 742         dbus_error_init(&error);
 743
 744         if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "GetSession")) {
 745                 const char *name;
 746                 char *p;
 747                 Session *session;
 748                 bool b;
 749
 750                 if (!dbus_message_get_args(
 751                                     message,
 752                                     &error,
 753                                     DBUS_TYPE_STRING, &name,
 754                                     DBUS_TYPE_INVALID))
 755                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 756
 757                 session = hashmap_get(m->sessions, name);
 758                 if (!session)
 759                         return bus_send_error_reply(connection, message, &error, -ENOENT);
 760
 761                 reply = dbus_message_new_method_return(message);
 762                 if (!reply)
 763                         goto oom;
 764
 765                 p = session_bus_path(session);
 766                 if (!p)
 767                         goto oom;
 768
 769                 b = dbus_message_append_args(
 770                                 reply,
 771                                 DBUS_TYPE_OBJECT_PATH, &p,
 772                                 DBUS_TYPE_INVALID);
 773                 free(p);
 774
 775                 if (!b)
 776                         goto oom;
 777
 778         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "GetSessionByPID")) {
 779                 uint32_t pid;
 780                 char *p;
 781                 Session *session;
 782                 bool b;
 783
 784                 if (!dbus_message_get_args(
 785                                     message,
 786                                     &error,
 787                                     DBUS_TYPE_UINT32, &pid,
 788                                     DBUS_TYPE_INVALID))
 789                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 790
 791                 r = manager_get_session_by_pid(m, pid, &session);
 792                 if (r <= 0)
 793                         return bus_send_error_reply(connection, message, NULL, r < 0 ? r : -ENOENT);
 794
 795                 reply = dbus_message_new_method_return(message);
 796                 if (!reply)
 797                         goto oom;
 798
 799                 p = session_bus_path(session);
 800                 if (!p)
 801                         goto oom;
 802
 803                 b = dbus_message_append_args(
 804                                 reply,
 805                                 DBUS_TYPE_OBJECT_PATH, &p,
 806                                 DBUS_TYPE_INVALID);
 807                 free(p);
 808
 809                 if (!b)
 810                         goto oom;
 811
 812         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "GetUser")) {
 813                 uint32_t uid;
 814                 char *p;
 815                 User *user;
 816                 bool b;
 817
 818                 if (!dbus_message_get_args(
 819                                     message,
 820                                     &error,
 821                                     DBUS_TYPE_UINT32, &uid,
 822                                     DBUS_TYPE_INVALID))
 823                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 824
 825                 user = hashmap_get(m->users, ULONG_TO_PTR((unsigned long) uid));
 826                 if (!user)
 827                         return bus_send_error_reply(connection, message, &error, -ENOENT);
 828
 829                 reply = dbus_message_new_method_return(message);
 830                 if (!reply)
 831                         goto oom;
 832
 833                 p = user_bus_path(user);
 834                 if (!p)
 835                         goto oom;
 836
 837                 b = dbus_message_append_args(
 838                                 reply,
 839                                 DBUS_TYPE_OBJECT_PATH, &p,
 840                                 DBUS_TYPE_INVALID);
 841                 free(p);
 842
 843                 if (!b)
 844                         goto oom;
 845
 846         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "GetSeat")) {
 847                 const char *name;
 848                 char *p;
 849                 Seat *seat;
 850                 bool b;
 851
 852                 if (!dbus_message_get_args(
 853                                     message,
 854                                     &error,
 855                                     DBUS_TYPE_STRING, &name,
 856                                     DBUS_TYPE_INVALID))
 857                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 858
 859                 seat = hashmap_get(m->seats, name);
 860                 if (!seat)
 861                         return bus_send_error_reply(connection, message, &error, -ENOENT);
 862
 863                 reply = dbus_message_new_method_return(message);
 864                 if (!reply)
 865                         goto oom;
 866
 867                 p = seat_bus_path(seat);
 868                 if (!p)
 869                         goto oom;
 870
 871                 b = dbus_message_append_args(
 872                                 reply,
 873                                 DBUS_TYPE_OBJECT_PATH, &p,
 874                                 DBUS_TYPE_INVALID);
 875                 free(p);
 876
 877                 if (!b)
 878                         goto oom;
 879
 880         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "ListSessions")) {
 881                 char *p;
 882                 Session *session;
 883                 Iterator i;
 884                 DBusMessageIter iter, sub;
 885                 const char *empty = "";
 886
 887                 reply = dbus_message_new_method_return(message);
 888                 if (!reply)
 889                         goto oom;
 890
 891                 dbus_message_iter_init_append(reply, &iter);
 892
 893                 if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "(susso)", &sub))
 894                         goto oom;
 895
 896                 HASHMAP_FOREACH(session, m->sessions, i) {
 897                         DBusMessageIter sub2;
 898                         uint32_t uid;
 899
 900                         if (!dbus_message_iter_open_container(&sub, DBUS_TYPE_STRUCT, NULL, &sub2))
 901                                 goto oom;
 902
 903                         uid = session->user->uid;
 904
 905                         p = session_bus_path(session);
 906                         if (!p)
 907                                 goto oom;
 908
 909                         if (!dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &session->id) ||
 910                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_UINT32, &uid) ||
 911                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &session->user->name) ||
 912                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, session->seat ? (const char**) &session->seat->id : &empty) ||
 913                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_OBJECT_PATH, &p)) {
 914                                 free(p);
 915                                 goto oom;
 916                         }
 917
 918                         free(p);
 919
 920                         if (!dbus_message_iter_close_container(&sub, &sub2))
 921                                 goto oom;
 922                 }
 923
 924                 if (!dbus_message_iter_close_container(&iter, &sub))
 925                         goto oom;
 926
 927         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "ListUsers")) {
 928                 char *p;
 929                 User *user;
 930                 Iterator i;
 931                 DBusMessageIter iter, sub;
 932
 933                 reply = dbus_message_new_method_return(message);
 934                 if (!reply)
 935                         goto oom;
 936
 937                 dbus_message_iter_init_append(reply, &iter);
 938
 939                 if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "(uso)", &sub))
 940                         goto oom;
 941
 942                 HASHMAP_FOREACH(user, m->users, i) {
 943                         DBusMessageIter sub2;
 944                         uint32_t uid;
 945
 946                         if (!dbus_message_iter_open_container(&sub, DBUS_TYPE_STRUCT, NULL, &sub2))
 947                                 goto oom;
 948
 949                         uid = user->uid;
 950
 951                         p = user_bus_path(user);
 952                         if (!p)
 953                                 goto oom;
 954
 955                         if (!dbus_message_iter_append_basic(&sub2, DBUS_TYPE_UINT32, &uid) ||
 956                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &user->name) ||
 957                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_OBJECT_PATH, &p)) {
 958                                 free(p);
 959                                 goto oom;
 960                         }
 961
 962                         free(p);
 963
 964                         if (!dbus_message_iter_close_container(&sub, &sub2))
 965                                 goto oom;
 966                 }
 967
 968                 if (!dbus_message_iter_close_container(&iter, &sub))
 969                         goto oom;
 970
 971         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "ListSeats")) {
 972                 char *p;
 973                 Seat *seat;
 974                 Iterator i;
 975                 DBusMessageIter iter, sub;
 976
 977                 reply = dbus_message_new_method_return(message);
 978                 if (!reply)
 979                         goto oom;
 980
 981                 dbus_message_iter_init_append(reply, &iter);
 982
 983                 if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "(so)", &sub))
 984                         goto oom;
 985
 986                 HASHMAP_FOREACH(seat, m->seats, i) {
 987                         DBusMessageIter sub2;
 988
 989                         if (!dbus_message_iter_open_container(&sub, DBUS_TYPE_STRUCT, NULL, &sub2))
 990                                 goto oom;
 991
 992                         p = seat_bus_path(seat);
 993                         if (!p)
 994                                 goto oom;
 995
 996                         if (!dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &seat->id) ||
 997                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_OBJECT_PATH, &p)) {
 998                                 free(p);
 999                                 goto oom;
1000                         }
1001
1002                         free(p);
1003
1004                         if (!dbus_message_iter_close_container(&sub, &sub2))
1005                                 goto oom;
1006                 }
1007
1008                 if (!dbus_message_iter_close_container(&iter, &sub))
1009                         goto oom;
1010
1011         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "CreateSession")) {
1012
1013                 r = bus_manager_create_session(m, message, &reply);
1014
1015                 /* Don't delay the work on OOM here, since it might be
1016                  * triggered by a low RLIMIT_NOFILE here (since we
1017                  * send a dupped fd to the client), and we'd rather
1018                  * see this fail quickly then be retried later */
1019
1020                 if (r < 0)
1021                         return bus_send_error_reply(connection, message, &error, r);
1022
1023         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "ActivateSession")) {
1024                 const char *name;
1025                 Session *session;
1026
1027                 if (!dbus_message_get_args(
1028                                     message,
1029                                     &error,
1030                                     DBUS_TYPE_STRING, &name,
1031                                     DBUS_TYPE_INVALID))
1032                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1033
1034                 session = hashmap_get(m->sessions, name);
1035                 if (!session)
1036                         return bus_send_error_reply(connection, message, &error, -ENOENT);
1037
1038                 r = session_activate(session);
1039                 if (r < 0)
1040                         return bus_send_error_reply(connection, message, NULL, r);
1041
1042                 reply = dbus_message_new_method_return(message);
1043                 if (!reply)
1044                         goto oom;
1045
1046         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "LockSession") ||
1047                    dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "UnlockSession")) {
1048                 const char *name;
1049                 Session *session;
1050
1051                 if (!dbus_message_get_args(
1052                                     message,
1053                                     &error,
1054                                     DBUS_TYPE_STRING, &name,
1055                                     DBUS_TYPE_INVALID))
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                 if (session_send_lock(session, streq(dbus_message_get_member(message), "LockSession")) < 0)
1063                         goto oom;
1064
1065                 reply = dbus_message_new_method_return(message);
1066                 if (!reply)
1067                         goto oom;
1068
1069         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "KillSession")) {
1070                 const char *swho;
1071                 int32_t signo;
1072                 KillWho who;
1073                 const char *name;
1074                 Session *session;
1075
1076                 if (!dbus_message_get_args(
1077                                     message,
1078                                     &error,
1079                                     DBUS_TYPE_STRING, &name,
1080                                     DBUS_TYPE_STRING, &swho,
1081                                     DBUS_TYPE_INT32, &signo,
1082                                     DBUS_TYPE_INVALID))
1083                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1084
1085                 if (isempty(swho))
1086                         who = KILL_ALL;
1087                 else {
1088                         who = kill_who_from_string(swho);
1089                         if (who < 0)
1090                                 return bus_send_error_reply(connection, message, &error, -EINVAL);
1091                 }
1092
1093                 if (signo <= 0 || signo >= _NSIG)
1094                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1095
1096                 session = hashmap_get(m->sessions, name);
1097                 if (!session)
1098                         return bus_send_error_reply(connection, message, &error, -ENOENT);
1099
1100                 r = session_kill(session, who, signo);
1101                 if (r < 0)
1102                         return bus_send_error_reply(connection, message, NULL, r);
1103
1104                 reply = dbus_message_new_method_return(message);
1105                 if (!reply)
1106                         goto oom;
1107
1108         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "KillUser")) {
1109                 uint32_t uid;
1110                 User *user;
1111                 int32_t signo;
1112
1113                 if (!dbus_message_get_args(
1114                                     message,
1115                                     &error,
1116                                     DBUS_TYPE_UINT32, &uid,
1117                                     DBUS_TYPE_INT32, &signo,
1118                                     DBUS_TYPE_INVALID))
1119                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1120
1121                 if (signo <= 0 || signo >= _NSIG)
1122                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1123
1124                 user = hashmap_get(m->users, ULONG_TO_PTR((unsigned long) uid));
1125                 if (!user)
1126                         return bus_send_error_reply(connection, message, &error, -ENOENT);
1127
1128                 r = user_kill(user, signo);
1129                 if (r < 0)
1130                         return bus_send_error_reply(connection, message, NULL, r);
1131
1132                 reply = dbus_message_new_method_return(message);
1133                 if (!reply)
1134                         goto oom;
1135
1136         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "TerminateSession")) {
1137                 const char *name;
1138                 Session *session;
1139
1140                 if (!dbus_message_get_args(
1141                                     message,
1142                                     &error,
1143                                     DBUS_TYPE_STRING, &name,
1144                                     DBUS_TYPE_INVALID))
1145                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1146
1147                 session = hashmap_get(m->sessions, name);
1148                 if (!session)
1149                         return bus_send_error_reply(connection, message, &error, -ENOENT);
1150
1151                 r = session_stop(session);
1152                 if (r < 0)
1153                         return bus_send_error_reply(connection, message, NULL, r);
1154
1155                 reply = dbus_message_new_method_return(message);
1156                 if (!reply)
1157                         goto oom;
1158
1159         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "TerminateUser")) {
1160                 uint32_t uid;
1161                 User *user;
1162
1163                 if (!dbus_message_get_args(
1164                                     message,
1165                                     &error,
1166                                     DBUS_TYPE_UINT32, &uid,
1167                                     DBUS_TYPE_INVALID))
1168                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1169
1170                 user = hashmap_get(m->users, ULONG_TO_PTR((unsigned long) uid));
1171                 if (!user)
1172                         return bus_send_error_reply(connection, message, &error, -ENOENT);
1173
1174                 r = user_stop(user);
1175                 if (r < 0)
1176                         return bus_send_error_reply(connection, message, NULL, r);
1177
1178                 reply = dbus_message_new_method_return(message);
1179                 if (!reply)
1180                         goto oom;
1181
1182         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "TerminateSeat")) {
1183                 const char *name;
1184                 Seat *seat;
1185
1186                 if (!dbus_message_get_args(
1187                                     message,
1188                                     &error,
1189                                     DBUS_TYPE_STRING, &name,
1190                                     DBUS_TYPE_INVALID))
1191                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1192
1193                 seat = hashmap_get(m->seats, name);
1194                 if (!seat)
1195                         return bus_send_error_reply(connection, message, &error, -ENOENT);
1196
1197                 r = seat_stop_sessions(seat);
1198                 if (r < 0)
1199                         return bus_send_error_reply(connection, message, NULL, r);
1200
1201                 reply = dbus_message_new_method_return(message);
1202                 if (!reply)
1203                         goto oom;
1204
1205         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "SetUserLinger")) {
1206                 uint32_t uid;
1207                 struct passwd *pw;
1208                 dbus_bool_t b, interactive;
1209                 char *path;
1210
1211                 if (!dbus_message_get_args(
1212                                     message,
1213                                     &error,
1214                                     DBUS_TYPE_UINT32, &uid,
1215                                     DBUS_TYPE_BOOLEAN, &b,
1216                                     DBUS_TYPE_BOOLEAN, &interactive,
1217                                     DBUS_TYPE_INVALID))
1218                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1219
1220                 errno = 0;
1221                 pw = getpwuid(uid);
1222                 if (!pw)
1223                         return bus_send_error_reply(connection, message, NULL, errno ? -errno : -EINVAL);
1224
1225                 r = verify_polkit(connection, message, "org.freedesktop.login1.set-user-linger", interactive, &error);
1226                 if (r < 0)
1227                         return bus_send_error_reply(connection, message, &error, r);
1228
1229                 mkdir_p("/var/lib/systemd", 0755);
1230
1231                 r = safe_mkdir("/var/lib/systemd/linger", 0755, 0, 0);
1232                 if (r < 0)
1233                         return bus_send_error_reply(connection, message, &error, r);
1234
1235                 path = strappend("/var/lib/systemd/linger/", pw->pw_name);
1236                 if (!path)
1237                         goto oom;
1238
1239                 if (b) {
1240                         User *u;
1241
1242                         r = touch(path);
1243                         free(path);
1244
1245                         if (r < 0)
1246                                 return bus_send_error_reply(connection, message, &error, r);
1247
1248                         if (manager_add_user_by_uid(m, uid, &u) >= 0)
1249                                 user_start(u);
1250
1251                 } else {
1252                         User *u;
1253
1254                         r = unlink(path);
1255                         free(path);
1256
1257                         if (r < 0 && errno != ENOENT)
1258                                 return bus_send_error_reply(connection, message, &error, -errno);
1259
1260                         u = hashmap_get(m->users, ULONG_TO_PTR((unsigned long) uid));
1261                         if (u)
1262                                 user_add_to_gc_queue(u);
1263                 }
1264
1265                 reply = dbus_message_new_method_return(message);
1266                 if (!reply)
1267                         goto oom;
1268
1269         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "AttachDevice")) {
1270                 const char *sysfs, *seat;
1271                 dbus_bool_t interactive;
1272
1273                 if (!dbus_message_get_args(
1274                                     message,
1275                                     &error,
1276                                     DBUS_TYPE_STRING, &seat,
1277                                     DBUS_TYPE_STRING, &sysfs,
1278                                     DBUS_TYPE_BOOLEAN, &interactive,
1279                                     DBUS_TYPE_INVALID))
1280                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1281
1282                 if (!path_startswith(sysfs, "/sys") || !seat_name_is_valid(seat))
1283                         return bus_send_error_reply(connection, message, NULL, -EINVAL);
1284
1285                 r = verify_polkit(connection, message, "org.freedesktop.login1.attach-device", interactive, &error);
1286                 if (r < 0)
1287                         return bus_send_error_reply(connection, message, &error, r);
1288
1289                 r = attach_device(m, seat, sysfs);
1290                 if (r < 0)
1291                         return bus_send_error_reply(connection, message, NULL, -EINVAL);
1292
1293                 reply = dbus_message_new_method_return(message);
1294                 if (!reply)
1295                         goto oom;
1296
1297
1298         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "FlushDevices")) {
1299                 dbus_bool_t interactive;
1300
1301                 if (!dbus_message_get_args(
1302                                     message,
1303                                     &error,
1304                                     DBUS_TYPE_BOOLEAN, &interactive,
1305                                     DBUS_TYPE_INVALID))
1306                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1307
1308                 r = verify_polkit(connection, message, "org.freedesktop.login1.flush-devices", interactive, &error);
1309                 if (r < 0)
1310                         return bus_send_error_reply(connection, message, &error, r);
1311
1312                 r = flush_devices(m);
1313                 if (r < 0)
1314                         return bus_send_error_reply(connection, message, NULL, -EINVAL);
1315
1316                 reply = dbus_message_new_method_return(message);
1317                 if (!reply)
1318                         goto oom;
1319
1320         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "PowerOff") ||
1321                    dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "Reboot")) {
1322                 dbus_bool_t interactive;
1323                 bool multiple_sessions;
1324                 DBusMessage *forward, *freply;
1325                 const char *name;
1326                 const char *mode = "replace";
1327                 const char *action;
1328
1329                 if (!dbus_message_get_args(
1330                                     message,
1331                                     &error,
1332                                     DBUS_TYPE_BOOLEAN, &interactive,
1333                                     DBUS_TYPE_INVALID))
1334                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1335
1336                 multiple_sessions = hashmap_size(m->sessions) > 1;
1337
1338                 if (!multiple_sessions) {
1339                         Session *s;
1340
1341                         /* Hmm, there's only one session, but let's
1342                          * make sure it actually belongs to the user
1343                          * who is asking. If not, better be safe than
1344                          * sorry. */
1345
1346                         s = hashmap_first(m->sessions);
1347                         if (s) {
1348                                 unsigned long ul;
1349
1350                                 ul = dbus_bus_get_unix_user(connection, dbus_message_get_sender(message), &error);
1351                                 if (ul == (unsigned long) -1)
1352                                         return bus_send_error_reply(connection, message, &error, -EIO);
1353
1354                                 multiple_sessions = s->user->uid != ul;
1355                         }
1356                 }
1357
1358                 if (streq(dbus_message_get_member(message), "PowerOff")) {
1359                         if (multiple_sessions)
1360                                 action = "org.freedesktop.login1.power-off-multiple-sessions";
1361                         else
1362                                 action = "org.freedesktop.login1.power-off";
1363
1364                         name = SPECIAL_POWEROFF_TARGET;
1365                 } else {
1366                         if (multiple_sessions)
1367                                 action = "org.freedesktop.login1.reboot-multiple-sessions";
1368                         else
1369                                 action = "org.freedesktop.login1.reboot";
1370
1371                         name = SPECIAL_REBOOT_TARGET;
1372                 }
1373
1374                 r = verify_polkit(connection, message, action, interactive, &error);
1375                 if (r < 0)
1376                         return bus_send_error_reply(connection, message, &error, r);
1377
1378                 forward = dbus_message_new_method_call(
1379                               "org.freedesktop.systemd1",
1380                               "/org/freedesktop/systemd1",
1381                               "org.freedesktop.systemd1.Manager",
1382                               "StartUnit");
1383                 if (!forward)
1384                         return bus_send_error_reply(connection, message, NULL, -ENOMEM);
1385
1386                 if (!dbus_message_append_args(forward,
1387                                               DBUS_TYPE_STRING, &name,
1388                                               DBUS_TYPE_STRING, &mode,
1389                                               DBUS_TYPE_INVALID)) {
1390                         dbus_message_unref(forward);
1391                         return bus_send_error_reply(connection, message, NULL, -ENOMEM);
1392                 }
1393
1394                 freply = dbus_connection_send_with_reply_and_block(connection, forward, -1, &error);
1395                 dbus_message_unref(forward);
1396
1397                 if (!freply)
1398                         return bus_send_error_reply(connection, message, &error, -EIO);
1399
1400                 dbus_message_unref(freply);
1401
1402                 reply = dbus_message_new_method_return(message);
1403                 if (!reply)
1404                         goto oom;
1405
1406         } else if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Introspectable", "Introspect")) {
1407                 char *introspection = NULL;
1408                 FILE *f;
1409                 Iterator i;
1410                 Session *session;
1411                 Seat *seat;
1412                 User *user;
1413                 size_t size;
1414                 char *p;
1415
1416                 if (!(reply = dbus_message_new_method_return(message)))
1417                         goto oom;
1418
1419                 /* We roll our own introspection code here, instead of
1420                  * relying on bus_default_message_handler() because we
1421                  * need to generate our introspection string
1422                  * dynamically. */
1423
1424                 if (!(f = open_memstream(&introspection, &size)))
1425                         goto oom;
1426
1427                 fputs(INTROSPECTION_BEGIN, f);
1428
1429                 HASHMAP_FOREACH(seat, m->seats, i) {
1430                         p = bus_path_escape(seat->id);
1431
1432                         if (p) {
1433                                 fprintf(f, "<node name=\"seat/%s\"/>", p);
1434                                 free(p);
1435                         }
1436                 }
1437
1438                 HASHMAP_FOREACH(user, m->users, i)
1439                         fprintf(f, "<node name=\"user/%llu\"/>", (unsigned long long) user->uid);
1440
1441                 HASHMAP_FOREACH(session, m->sessions, i) {
1442                         p = bus_path_escape(session->id);
1443
1444                         if (p) {
1445                                 fprintf(f, "<node name=\"session/%s\"/>", p);
1446                                 free(p);
1447                         }
1448                 }
1449
1450                 fputs(INTROSPECTION_END, f);
1451
1452                 if (ferror(f)) {
1453                         fclose(f);
1454                         free(introspection);
1455                         goto oom;
1456                 }
1457
1458                 fclose(f);
1459
1460                 if (!introspection)
1461                         goto oom;
1462
1463                 if (!dbus_message_append_args(reply, DBUS_TYPE_STRING, &introspection, DBUS_TYPE_INVALID)) {
1464                         free(introspection);
1465                         goto oom;
1466                 }
1467
1468                 free(introspection);
1469         } else {
1470                 const BusBoundProperties bps[] = {
1471                         { "org.freedesktop.login1.Manager", bus_login_manager_properties, m },
1472                         { NULL, }
1473                 };
1474                 return bus_default_message_handler(connection, message, NULL, INTERFACES_LIST, bps);
1475         }
1476
1477         if (reply) {
1478                 if (!dbus_connection_send(connection, reply, NULL))
1479                         goto oom;
1480
1481                 dbus_message_unref(reply);
1482         }
1483
1484         return DBUS_HANDLER_RESULT_HANDLED;
1485
1486 oom:
1487         if (reply)
1488                 dbus_message_unref(reply);
1489
1490         dbus_error_free(&error);
1491
1492         return DBUS_HANDLER_RESULT_NEED_MEMORY;
1493 }
1494
1495 const DBusObjectPathVTable bus_manager_vtable = {
1496         .message_function = manager_message_handler
1497 };
1498
1499 DBusHandlerResult bus_message_filter(
1500                 DBusConnection *connection,
1501                 DBusMessage *message,
1502                 void *userdata) {
1503
1504         Manager *m = userdata;
1505         DBusError error;
1506
1507         assert(m);
1508         assert(connection);
1509         assert(message);
1510
1511         dbus_error_init(&error);
1512
1513         if (dbus_message_is_signal(message, "org.freedesktop.systemd1.Agent", "Released")) {
1514                 const char *cgroup;
1515
1516                 if (!dbus_message_get_args(message, &error,
1517                                            DBUS_TYPE_STRING, &cgroup,
1518                                            DBUS_TYPE_INVALID))
1519                         log_error("Failed to parse Released message: %s", bus_error_message(&error));
1520                 else
1521                         manager_cgroup_notify_empty(m, cgroup);
1522         }
1523
1524         dbus_error_free(&error);
1525
1526         return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
1527 }
1528
1529 int manager_send_changed(Manager *manager, const char *properties) {
1530         DBusMessage *m;
1531         int r = -ENOMEM;
1532
1533         assert(manager);
1534
1535         m = bus_properties_changed_new("/org/freedesktop/login1", "org.freedesktop.login1.Manager", properties);
1536         if (!m)
1537                 goto finish;
1538
1539         if (!dbus_connection_send(manager->bus, m, NULL))
1540                 goto finish;
1541
1542         r = 0;
1543
1544 finish:
1545         if (m)
1546                 dbus_message_unref(m);
1547
1548         return r;
1549 }