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