src/login/logind-dbus.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include <errno.h>
   4 #include <pwd.h>
   5 #include <string.h>
   6 #include <unistd.h>
   7
   8 #include "sd-device.h"
   9 #include "sd-messages.h"
  10
  11 #include "alloc-util.h"
  12 #include "audit-util.h"
  13 #include "bus-common-errors.h"
  14 #include "bus-error.h"
  15 #include "bus-unit-util.h"
  16 #include "bus-util.h"
  17 #include "cgroup-util.h"
  18 #include "device-util.h"
  19 #include "dirent-util.h"
  20 #include "efivars.h"
  21 #include "escape.h"
  22 #include "fd-util.h"
  23 #include "fileio-label.h"
  24 #include "fileio.h"
  25 #include "format-util.h"
  26 #include "fs-util.h"
  27 #include "logind.h"
  28 #include "missing_capability.h"
  29 #include "mkdir.h"
  30 #include "path-util.h"
  31 #include "process-util.h"
  32 #include "selinux-util.h"
  33 #include "sleep-config.h"
  34 #include "special.h"
  35 #include "strv.h"
  36 #include "terminal-util.h"
  37 #include "tmpfile-util.h"
  38 #include "unit-name.h"
  39 #include "user-util.h"
  40 #include "utmp-wtmp.h"
  41
  42 static int get_sender_session(Manager *m, sd_bus_message *message, sd_bus_error *error, Session **ret) {
  43
  44         _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
  45         const char *name;
  46         Session *session;
  47         int r;
  48
  49         /* Get client login session.  This is not what you are looking for these days,
  50          * as apps may instead belong to a user service unit.  This includes terminal
  51          * emulators and hence command-line apps. */
  52         r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_SESSION|SD_BUS_CREDS_AUGMENT, &creds);
  53         if (r < 0)
  54                 return r;
  55
  56         r = sd_bus_creds_get_session(creds, &name);
  57         if (r == -ENXIO)
  58                 goto err_no_session;
  59         if (r < 0)
  60                 return r;
  61
  62         session = hashmap_get(m->sessions, name);
  63         if (!session)
  64                 goto err_no_session;
  65
  66         *ret = session;
  67         return 0;
  68
  69 err_no_session:
  70         return sd_bus_error_setf(error, BUS_ERROR_NO_SESSION_FOR_PID,
  71                                  "Caller does not belong to any known session");
  72 }
  73
  74 int manager_get_session_from_creds(Manager *m, sd_bus_message *message, const char *name, sd_bus_error *error, Session **ret) {
  75         Session *session;
  76
  77         assert(m);
  78         assert(message);
  79         assert(ret);
  80
  81         if (isempty(name))
  82                 return get_sender_session(m, message, error, ret);
  83
  84         session = hashmap_get(m->sessions, name);
  85         if (!session)
  86                 return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_SESSION, "No session '%s' known", name);
  87
  88         *ret = session;
  89         return 0;
  90 }
  91
  92 static int get_sender_user(Manager *m, sd_bus_message *message, sd_bus_error *error, User **ret) {
  93
  94         _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
  95         uid_t uid;
  96         User *user;
  97         int r;
  98
  99         /* Note that we get the owner UID of the session, not the actual client UID here! */
 100         r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_OWNER_UID|SD_BUS_CREDS_AUGMENT, &creds);
 101         if (r < 0)
 102                 return r;
 103
 104         r = sd_bus_creds_get_owner_uid(creds, &uid);
 105         if (r == -ENXIO)
 106                 goto err_no_user;
 107         if (r < 0)
 108                 return r;
 109
 110         user = hashmap_get(m->users, UID_TO_PTR(uid));
 111         if (!user)
 112                 goto err_no_user;
 113
 114         *ret = user;
 115         return 0;
 116
 117 err_no_user:
 118         return sd_bus_error_setf(error, BUS_ERROR_NO_USER_FOR_PID, "Caller does not belong to any logged in user or lingering user");
 119 }
 120
 121 int manager_get_user_from_creds(Manager *m, sd_bus_message *message, uid_t uid, sd_bus_error *error, User **ret) {
 122         User *user;
 123
 124         assert(m);
 125         assert(message);
 126         assert(ret);
 127
 128         if (!uid_is_valid(uid))
 129                 return get_sender_user(m, message, error, ret);
 130
 131         user = hashmap_get(m->users, UID_TO_PTR(uid));
 132         if (!user)
 133                 return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_USER, "User ID "UID_FMT" is not logged in or lingering", uid);
 134
 135         *ret = user;
 136         return 0;
 137 }
 138
 139 int manager_get_seat_from_creds(Manager *m, sd_bus_message *message, const char *name, sd_bus_error *error, Seat **ret) {
 140         Seat *seat;
 141         int r;
 142
 143         assert(m);
 144         assert(message);
 145         assert(ret);
 146
 147         if (isempty(name)) {
 148                 Session *session;
 149
 150                 r = manager_get_session_from_creds(m, message, NULL, error, &session);
 151                 if (r < 0)
 152                         return r;
 153
 154                 seat = session->seat;
 155                 if (!seat)
 156                         return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_SEAT, "Session has no seat.");
 157         } else {
 158                 seat = hashmap_get(m->seats, name);
 159                 if (!seat)
 160                         return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_SEAT, "No seat '%s' known", name);
 161         }
 162
 163         *ret = seat;
 164         return 0;
 165 }
 166
 167 static int property_get_idle_hint(
 168                 sd_bus *bus,
 169                 const char *path,
 170                 const char *interface,
 171                 const char *property,
 172                 sd_bus_message *reply,
 173                 void *userdata,
 174                 sd_bus_error *error) {
 175
 176         Manager *m = userdata;
 177
 178         assert(bus);
 179         assert(reply);
 180         assert(m);
 181
 182         return sd_bus_message_append(reply, "b", manager_get_idle_hint(m, NULL) > 0);
 183 }
 184
 185 static int property_get_idle_since_hint(
 186                 sd_bus *bus,
 187                 const char *path,
 188                 const char *interface,
 189                 const char *property,
 190                 sd_bus_message *reply,
 191                 void *userdata,
 192                 sd_bus_error *error) {
 193
 194         Manager *m = userdata;
 195         dual_timestamp t = DUAL_TIMESTAMP_NULL;
 196
 197         assert(bus);
 198         assert(reply);
 199         assert(m);
 200
 201         manager_get_idle_hint(m, &t);
 202
 203         return sd_bus_message_append(reply, "t", streq(property, "IdleSinceHint") ? t.realtime : t.monotonic);
 204 }
 205
 206 static int property_get_inhibited(
 207                 sd_bus *bus,
 208                 const char *path,
 209                 const char *interface,
 210                 const char *property,
 211                 sd_bus_message *reply,
 212                 void *userdata,
 213                 sd_bus_error *error) {
 214
 215         Manager *m = userdata;
 216         InhibitWhat w;
 217
 218         assert(bus);
 219         assert(reply);
 220         assert(m);
 221
 222         w = manager_inhibit_what(m, streq(property, "BlockInhibited") ? INHIBIT_BLOCK : INHIBIT_DELAY);
 223
 224         return sd_bus_message_append(reply, "s", inhibit_what_to_string(w));
 225 }
 226
 227 static int property_get_preparing(
 228                 sd_bus *bus,
 229                 const char *path,
 230                 const char *interface,
 231                 const char *property,
 232                 sd_bus_message *reply,
 233                 void *userdata,
 234                 sd_bus_error *error) {
 235
 236         Manager *m = userdata;
 237         bool b;
 238
 239         assert(bus);
 240         assert(reply);
 241         assert(m);
 242
 243         if (streq(property, "PreparingForShutdown"))
 244                 b = m->action_what & INHIBIT_SHUTDOWN;
 245         else
 246                 b = m->action_what & INHIBIT_SLEEP;
 247
 248         return sd_bus_message_append(reply, "b", b);
 249 }
 250
 251 static int property_get_scheduled_shutdown(
 252                 sd_bus *bus,
 253                 const char *path,
 254                 const char *interface,
 255                 const char *property,
 256                 sd_bus_message *reply,
 257                 void *userdata,
 258                 sd_bus_error *error) {
 259
 260         Manager *m = userdata;
 261         int r;
 262
 263         assert(bus);
 264         assert(reply);
 265         assert(m);
 266
 267         r = sd_bus_message_open_container(reply, 'r', "st");
 268         if (r < 0)
 269                 return r;
 270
 271         r = sd_bus_message_append(reply, "st", m->scheduled_shutdown_type, m->scheduled_shutdown_timeout);
 272         if (r < 0)
 273                 return r;
 274
 275         return sd_bus_message_close_container(reply);
 276 }
 277
 278 static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_handle_action, handle_action, HandleAction);
 279 static BUS_DEFINE_PROPERTY_GET(property_get_docked, "b", Manager, manager_is_docked_or_external_displays);
 280 static BUS_DEFINE_PROPERTY_GET(property_get_lid_closed, "b", Manager, manager_is_lid_closed);
 281 static BUS_DEFINE_PROPERTY_GET_GLOBAL(property_get_on_external_power, "b", manager_is_on_external_power);
 282 static BUS_DEFINE_PROPERTY_GET_GLOBAL(property_get_compat_user_tasks_max, "t", CGROUP_LIMIT_MAX);
 283 static BUS_DEFINE_PROPERTY_GET_REF(property_get_hashmap_size, "t", Hashmap *, (uint64_t) hashmap_size);
 284
 285 static int method_get_session(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 286         _cleanup_free_ char *p = NULL;
 287         Manager *m = userdata;
 288         const char *name;
 289         Session *session;
 290         int r;
 291
 292         assert(message);
 293         assert(m);
 294
 295         r = sd_bus_message_read(message, "s", &name);
 296         if (r < 0)
 297                 return r;
 298
 299         r = manager_get_session_from_creds(m, message, name, error, &session);
 300         if (r < 0)
 301                 return r;
 302
 303         p = session_bus_path(session);
 304         if (!p)
 305                 return -ENOMEM;
 306
 307         return sd_bus_reply_method_return(message, "o", p);
 308 }
 309
 310 /* Get login session of a process.  This is not what you are looking for these days,
 311  * as apps may instead belong to a user service unit.  This includes terminal
 312  * emulators and hence command-line apps. */
 313 static int method_get_session_by_pid(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 314         _cleanup_free_ char *p = NULL;
 315         Session *session = NULL;
 316         Manager *m = userdata;
 317         pid_t pid;
 318         int r;
 319
 320         assert(message);
 321         assert(m);
 322
 323         assert_cc(sizeof(pid_t) == sizeof(uint32_t));
 324
 325         r = sd_bus_message_read(message, "u", &pid);
 326         if (r < 0)
 327                 return r;
 328         if (pid < 0)
 329                 return -EINVAL;
 330
 331         if (pid == 0) {
 332                 r = manager_get_session_from_creds(m, message, NULL, error, &session);
 333                 if (r < 0)
 334                         return r;
 335         } else {
 336                 r = manager_get_session_by_pid(m, pid, &session);
 337                 if (r < 0)
 338                         return r;
 339
 340                 if (!session)
 341                         return sd_bus_error_setf(error, BUS_ERROR_NO_SESSION_FOR_PID, "PID "PID_FMT" does not belong to any known session", pid);
 342         }
 343
 344         p = session_bus_path(session);
 345         if (!p)
 346                 return -ENOMEM;
 347
 348         return sd_bus_reply_method_return(message, "o", p);
 349 }
 350
 351 static int method_get_user(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 352         _cleanup_free_ char *p = NULL;
 353         Manager *m = userdata;
 354         uint32_t uid;
 355         User *user;
 356         int r;
 357
 358         assert(message);
 359         assert(m);
 360
 361         r = sd_bus_message_read(message, "u", &uid);
 362         if (r < 0)
 363                 return r;
 364
 365         r = manager_get_user_from_creds(m, message, uid, error, &user);
 366         if (r < 0)
 367                 return r;
 368
 369         p = user_bus_path(user);
 370         if (!p)
 371                 return -ENOMEM;
 372
 373         return sd_bus_reply_method_return(message, "o", p);
 374 }
 375
 376 static int method_get_user_by_pid(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 377         _cleanup_free_ char *p = NULL;
 378         Manager *m = userdata;
 379         User *user = NULL;
 380         pid_t pid;
 381         int r;
 382
 383         assert(message);
 384         assert(m);
 385
 386         assert_cc(sizeof(pid_t) == sizeof(uint32_t));
 387
 388         r = sd_bus_message_read(message, "u", &pid);
 389         if (r < 0)
 390                 return r;
 391         if (pid < 0)
 392                 return -EINVAL;
 393
 394         if (pid == 0) {
 395                 r = manager_get_user_from_creds(m, message, UID_INVALID, error, &user);
 396                 if (r < 0)
 397                         return r;
 398         } else {
 399                 r = manager_get_user_by_pid(m, pid, &user);
 400                 if (r < 0)
 401                         return r;
 402                 if (!user)
 403                         return sd_bus_error_setf(error, BUS_ERROR_NO_USER_FOR_PID,
 404                                                  "PID "PID_FMT" does not belong to any logged in user or lingering user",
 405                                                  pid);
 406         }
 407
 408         p = user_bus_path(user);
 409         if (!p)
 410                 return -ENOMEM;
 411
 412         return sd_bus_reply_method_return(message, "o", p);
 413 }
 414
 415 static int method_get_seat(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 416         _cleanup_free_ char *p = NULL;
 417         Manager *m = userdata;
 418         const char *name;
 419         Seat *seat;
 420         int r;
 421
 422         assert(message);
 423         assert(m);
 424
 425         r = sd_bus_message_read(message, "s", &name);
 426         if (r < 0)
 427                 return r;
 428
 429         r = manager_get_seat_from_creds(m, message, name, error, &seat);
 430         if (r < 0)
 431                 return r;
 432
 433         p = seat_bus_path(seat);
 434         if (!p)
 435                 return -ENOMEM;
 436
 437         return sd_bus_reply_method_return(message, "o", p);
 438 }
 439
 440 static int method_list_sessions(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 441         _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
 442         Manager *m = userdata;
 443         Session *session;
 444         Iterator i;
 445         int r;
 446
 447         assert(message);
 448         assert(m);
 449
 450         r = sd_bus_message_new_method_return(message, &reply);
 451         if (r < 0)
 452                 return r;
 453
 454         r = sd_bus_message_open_container(reply, 'a', "(susso)");
 455         if (r < 0)
 456                 return r;
 457
 458         HASHMAP_FOREACH(session, m->sessions, i) {
 459                 _cleanup_free_ char *p = NULL;
 460
 461                 p = session_bus_path(session);
 462                 if (!p)
 463                         return -ENOMEM;
 464
 465                 r = sd_bus_message_append(reply, "(susso)",
 466                                           session->id,
 467                                           (uint32_t) session->user->uid,
 468                                           session->user->name,
 469                                           session->seat ? session->seat->id : "",
 470                                           p);
 471                 if (r < 0)
 472                         return r;
 473         }
 474
 475         r = sd_bus_message_close_container(reply);
 476         if (r < 0)
 477                 return r;
 478
 479         return sd_bus_send(NULL, reply, NULL);
 480 }
 481
 482 static int method_list_users(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 483         _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
 484         Manager *m = userdata;
 485         User *user;
 486         Iterator i;
 487         int r;
 488
 489         assert(message);
 490         assert(m);
 491
 492         r = sd_bus_message_new_method_return(message, &reply);
 493         if (r < 0)
 494                 return r;
 495
 496         r = sd_bus_message_open_container(reply, 'a', "(uso)");
 497         if (r < 0)
 498                 return r;
 499
 500         HASHMAP_FOREACH(user, m->users, i) {
 501                 _cleanup_free_ char *p = NULL;
 502
 503                 p = user_bus_path(user);
 504                 if (!p)
 505                         return -ENOMEM;
 506
 507                 r = sd_bus_message_append(reply, "(uso)",
 508                                           (uint32_t) user->uid,
 509                                           user->name,
 510                                           p);
 511                 if (r < 0)
 512                         return r;
 513         }
 514
 515         r = sd_bus_message_close_container(reply);
 516         if (r < 0)
 517                 return r;
 518
 519         return sd_bus_send(NULL, reply, NULL);
 520 }
 521
 522 static int method_list_seats(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 523         _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
 524         Manager *m = userdata;
 525         Seat *seat;
 526         Iterator i;
 527         int r;
 528
 529         assert(message);
 530         assert(m);
 531
 532         r = sd_bus_message_new_method_return(message, &reply);
 533         if (r < 0)
 534                 return r;
 535
 536         r = sd_bus_message_open_container(reply, 'a', "(so)");
 537         if (r < 0)
 538                 return r;
 539
 540         HASHMAP_FOREACH(seat, m->seats, i) {
 541                 _cleanup_free_ char *p = NULL;
 542
 543                 p = seat_bus_path(seat);
 544                 if (!p)
 545                         return -ENOMEM;
 546
 547                 r = sd_bus_message_append(reply, "(so)", seat->id, p);
 548                 if (r < 0)
 549                         return r;
 550         }
 551
 552         r = sd_bus_message_close_container(reply);
 553         if (r < 0)
 554                 return r;
 555
 556         return sd_bus_send(NULL, reply, NULL);
 557 }
 558
 559 static int method_list_inhibitors(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 560         _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
 561         Manager *m = userdata;
 562         Inhibitor *inhibitor;
 563         Iterator i;
 564         int r;
 565
 566         assert(message);
 567         assert(m);
 568
 569         r = sd_bus_message_new_method_return(message, &reply);
 570         if (r < 0)
 571                 return r;
 572
 573         r = sd_bus_message_open_container(reply, 'a', "(ssssuu)");
 574         if (r < 0)
 575                 return r;
 576
 577         HASHMAP_FOREACH(inhibitor, m->inhibitors, i) {
 578
 579                 r = sd_bus_message_append(reply, "(ssssuu)",
 580                                           strempty(inhibit_what_to_string(inhibitor->what)),
 581                                           strempty(inhibitor->who),
 582                                           strempty(inhibitor->why),
 583                                           strempty(inhibit_mode_to_string(inhibitor->mode)),
 584                                           (uint32_t) inhibitor->uid,
 585                                           (uint32_t) inhibitor->pid);
 586                 if (r < 0)
 587                         return r;
 588         }
 589
 590         r = sd_bus_message_close_container(reply);
 591         if (r < 0)
 592                 return r;
 593
 594         return sd_bus_send(NULL, reply, NULL);
 595 }
 596
 597 static int method_create_session(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 598         const char *service, *type, *class, *cseat, *tty, *display, *remote_user, *remote_host, *desktop;
 599         _cleanup_free_ char *id = NULL;
 600         Session *session = NULL;
 601         uint32_t audit_id = 0;
 602         Manager *m = userdata;
 603         User *user = NULL;
 604         Seat *seat = NULL;
 605         pid_t leader;
 606         uid_t uid;
 607         int remote;
 608         uint32_t vtnr = 0;
 609         SessionType t;
 610         SessionClass c;
 611         int r;
 612
 613         assert(message);
 614         assert(m);
 615
 616         assert_cc(sizeof(pid_t) == sizeof(uint32_t));
 617         assert_cc(sizeof(uid_t) == sizeof(uint32_t));
 618
 619         r = sd_bus_message_read(message, "uusssssussbss", &uid, &leader, &service, &type, &class, &desktop, &cseat, &vtnr, &tty, &display, &remote, &remote_user, &remote_host);
 620         if (r < 0)
 621                 return r;
 622
 623         if (!uid_is_valid(uid))
 624                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid UID");
 625         if (leader < 0 || leader == 1 || leader == getpid_cached())
 626                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid leader PID");
 627
 628         if (isempty(type))
 629                 t = _SESSION_TYPE_INVALID;
 630         else {
 631                 t = session_type_from_string(type);
 632                 if (t < 0)
 633                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid session type %s", type);
 634         }
 635
 636         if (isempty(class))
 637                 c = _SESSION_CLASS_INVALID;
 638         else {
 639                 c = session_class_from_string(class);
 640                 if (c < 0)
 641                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid session class %s", class);
 642         }
 643
 644         if (isempty(desktop))
 645                 desktop = NULL;
 646         else {
 647                 if (!string_is_safe(desktop))
 648                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid desktop string %s", desktop);
 649         }
 650
 651         if (isempty(cseat))
 652                 seat = NULL;
 653         else {
 654                 seat = hashmap_get(m->seats, cseat);
 655                 if (!seat)
 656                         return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_SEAT, "No seat '%s' known", cseat);
 657         }
 658
 659         if (tty_is_vc(tty)) {
 660                 int v;
 661
 662                 if (!seat)
 663                         seat = m->seat0;
 664                 else if (seat != m->seat0)
 665                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "TTY %s is virtual console but seat %s is not seat0", tty, seat->id);
 666
 667                 v = vtnr_from_tty(tty);
 668                 if (v <= 0)
 669                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Cannot determine VT number from virtual console TTY %s", tty);
 670
 671                 if (vtnr == 0)
 672                         vtnr = (uint32_t) v;
 673                 else if (vtnr != (uint32_t) v)
 674                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Specified TTY and VT number do not match");
 675
 676         } else if (tty_is_console(tty)) {
 677
 678                 if (!seat)
 679                         seat = m->seat0;
 680                 else if (seat != m->seat0)
 681                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Console TTY specified but seat is not seat0");
 682
 683                 if (vtnr != 0)
 684                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Console TTY specified but VT number is not 0");
 685         }
 686
 687         if (seat) {
 688                 if (seat_has_vts(seat)) {
 689                         if (vtnr <= 0 || vtnr > 63)
 690                                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "VT number out of range");
 691                 } else {
 692                         if (vtnr != 0)
 693                                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Seat has no VTs but VT number not 0");
 694                 }
 695         }
 696
 697         if (t == _SESSION_TYPE_INVALID) {
 698                 if (!isempty(display))
 699                         t = SESSION_X11;
 700                 else if (!isempty(tty))
 701                         t = SESSION_TTY;
 702                 else
 703                         t = SESSION_UNSPECIFIED;
 704         }
 705
 706         if (c == _SESSION_CLASS_INVALID) {
 707                 if (t == SESSION_UNSPECIFIED)
 708                         c = SESSION_BACKGROUND;
 709                 else
 710                         c = SESSION_USER;
 711         }
 712
 713         if (leader == 0) {
 714                 _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
 715
 716                 r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_PID, &creds);
 717                 if (r < 0)
 718                         return r;
 719
 720                 r = sd_bus_creds_get_pid(creds, (pid_t*) &leader);
 721                 if (r < 0)
 722                         return r;
 723         }
 724
 725         /* Check if we are already in a logind session. Or if we are in user@.service which is a special PAM session
 726          * that avoids creating a logind session. */
 727         r = manager_get_user_by_pid(m, leader, NULL);
 728         if (r < 0)
 729                 return r;
 730         if (r > 0)
 731                 return sd_bus_error_setf(error, BUS_ERROR_SESSION_BUSY, "Already running in a session or user slice");
 732
 733         /*
 734          * Old gdm and lightdm start the user-session on the same VT as
 735          * the greeter session. But they destroy the greeter session
 736          * after the user-session and want the user-session to take
 737          * over the VT. We need to support this for
 738          * backwards-compatibility, so make sure we allow new sessions
 739          * on a VT that a greeter is running on. Furthermore, to allow
 740          * re-logins, we have to allow a greeter to take over a used VT for
 741          * the exact same reasons.
 742          */
 743         if (c != SESSION_GREETER &&
 744             vtnr > 0 &&
 745             vtnr < m->seat0->position_count &&
 746             m->seat0->positions[vtnr] &&
 747             m->seat0->positions[vtnr]->class != SESSION_GREETER)
 748                 return sd_bus_error_setf(error, BUS_ERROR_SESSION_BUSY, "Already occupied by a session");
 749
 750         if (hashmap_size(m->sessions) >= m->sessions_max)
 751                 return sd_bus_error_setf(error, SD_BUS_ERROR_LIMITS_EXCEEDED, "Maximum number of sessions (%" PRIu64 ") reached, refusing further sessions.", m->sessions_max);
 752
 753         (void) audit_session_from_pid(leader, &audit_id);
 754         if (audit_session_is_valid(audit_id)) {
 755                 /* Keep our session IDs and the audit session IDs in sync */
 756
 757                 if (asprintf(&id, "%"PRIu32, audit_id) < 0)
 758                         return -ENOMEM;
 759
 760                 /* Wut? There's already a session by this name and we
 761                  * didn't find it above? Weird, then let's not trust
 762                  * the audit data and let's better register a new
 763                  * ID */
 764                 if (hashmap_get(m->sessions, id)) {
 765                         log_warning("Existing logind session ID %s used by new audit session, ignoring.", id);
 766                         audit_id = AUDIT_SESSION_INVALID;
 767                         id = mfree(id);
 768                 }
 769         }
 770
 771         if (!id) {
 772                 do {
 773                         id = mfree(id);
 774
 775                         if (asprintf(&id, "c%lu", ++m->session_counter) < 0)
 776                                 return -ENOMEM;
 777
 778                 } while (hashmap_get(m->sessions, id));
 779         }
 780
 781         /* If we are not watching utmp aleady, try again */
 782         manager_reconnect_utmp(m);
 783
 784         r = manager_add_user_by_uid(m, uid, &user);
 785         if (r < 0)
 786                 goto fail;
 787
 788         r = manager_add_session(m, id, &session);
 789         if (r < 0)
 790                 goto fail;
 791
 792         session_set_user(session, user);
 793         r = session_set_leader(session, leader);
 794         if (r < 0)
 795                 goto fail;
 796
 797         session->type = t;
 798         session->class = c;
 799         session->remote = remote;
 800         session->vtnr = vtnr;
 801
 802         if (!isempty(tty)) {
 803                 session->tty = strdup(tty);
 804                 if (!session->tty) {
 805                         r = -ENOMEM;
 806                         goto fail;
 807                 }
 808
 809                 session->tty_validity = TTY_FROM_PAM;
 810         }
 811
 812         if (!isempty(display)) {
 813                 session->display = strdup(display);
 814                 if (!session->display) {
 815                         r = -ENOMEM;
 816                         goto fail;
 817                 }
 818         }
 819
 820         if (!isempty(remote_user)) {
 821                 session->remote_user = strdup(remote_user);
 822                 if (!session->remote_user) {
 823                         r = -ENOMEM;
 824                         goto fail;
 825                 }
 826         }
 827
 828         if (!isempty(remote_host)) {
 829                 session->remote_host = strdup(remote_host);
 830                 if (!session->remote_host) {
 831                         r = -ENOMEM;
 832                         goto fail;
 833                 }
 834         }
 835
 836         if (!isempty(service)) {
 837                 session->service = strdup(service);
 838                 if (!session->service) {
 839                         r = -ENOMEM;
 840                         goto fail;
 841                 }
 842         }
 843
 844         if (!isempty(desktop)) {
 845                 session->desktop = strdup(desktop);
 846                 if (!session->desktop) {
 847                         r = -ENOMEM;
 848                         goto fail;
 849                 }
 850         }
 851
 852         if (seat) {
 853                 r = seat_attach_session(seat, session);
 854                 if (r < 0)
 855                         goto fail;
 856         }
 857
 858         r = sd_bus_message_enter_container(message, 'a', "(sv)");
 859         if (r < 0)
 860                 goto fail;
 861
 862         r = session_start(session, message, error);
 863         if (r < 0)
 864                 goto fail;
 865
 866         r = sd_bus_message_exit_container(message);
 867         if (r < 0)
 868                 goto fail;
 869
 870         session->create_message = sd_bus_message_ref(message);
 871
 872         /* Now, let's wait until the slice unit and stuff got created. We send the reply back from
 873          * session_send_create_reply(). */
 874
 875         return 1;
 876
 877 fail:
 878         if (session)
 879                 session_add_to_gc_queue(session);
 880
 881         if (user)
 882                 user_add_to_gc_queue(user);
 883
 884         return r;
 885 }
 886
 887 static int method_release_session(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 888         Manager *m = userdata;
 889         Session *session;
 890         const char *name;
 891         int r;
 892
 893         assert(message);
 894         assert(m);
 895
 896         r = sd_bus_message_read(message, "s", &name);
 897         if (r < 0)
 898                 return r;
 899
 900         r = manager_get_session_from_creds(m, message, name, error, &session);
 901         if (r < 0)
 902                 return r;
 903
 904         r = session_release(session);
 905         if (r < 0)
 906                 return r;
 907
 908         return sd_bus_reply_method_return(message, NULL);
 909 }
 910
 911 static int method_activate_session(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 912         Manager *m = userdata;
 913         Session *session;
 914         const char *name;
 915         int r;
 916
 917         assert(message);
 918         assert(m);
 919
 920         r = sd_bus_message_read(message, "s", &name);
 921         if (r < 0)
 922                 return r;
 923
 924         r = manager_get_session_from_creds(m, message, name, error, &session);
 925         if (r < 0)
 926                 return r;
 927
 928         return bus_session_method_activate(message, session, error);
 929 }
 930
 931 static int method_activate_session_on_seat(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 932         const char *session_name, *seat_name;
 933         Manager *m = userdata;
 934         Session *session;
 935         Seat *seat;
 936         int r;
 937
 938         assert(message);
 939         assert(m);
 940
 941         /* Same as ActivateSession() but refuses to work if
 942          * the seat doesn't match */
 943
 944         r = sd_bus_message_read(message, "ss", &session_name, &seat_name);
 945         if (r < 0)
 946                 return r;
 947
 948         r = manager_get_session_from_creds(m, message, session_name, error, &session);
 949         if (r < 0)
 950                 return r;
 951
 952         r = manager_get_seat_from_creds(m, message, seat_name, error, &seat);
 953         if (r < 0)
 954                 return r;
 955
 956         if (session->seat != seat)
 957                 return sd_bus_error_setf(error, BUS_ERROR_SESSION_NOT_ON_SEAT, "Session %s not on seat %s", session_name, seat_name);
 958
 959         r = session_activate(session);
 960         if (r < 0)
 961                 return r;
 962
 963         return sd_bus_reply_method_return(message, NULL);
 964 }
 965
 966 static int method_lock_session(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 967         Manager *m = userdata;
 968         Session *session;
 969         const char *name;
 970         int r;
 971
 972         assert(message);
 973         assert(m);
 974
 975         r = sd_bus_message_read(message, "s", &name);
 976         if (r < 0)
 977                 return r;
 978
 979         r = manager_get_session_from_creds(m, message, name, error, &session);
 980         if (r < 0)
 981                 return r;
 982
 983         return bus_session_method_lock(message, session, error);
 984 }
 985
 986 static int method_lock_sessions(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 987         Manager *m = userdata;
 988         int r;
 989
 990         assert(message);
 991         assert(m);
 992
 993         r = bus_verify_polkit_async(
 994                         message,
 995                         CAP_SYS_ADMIN,
 996                         "org.freedesktop.login1.lock-sessions",
 997                         NULL,
 998                         false,
 999                         UID_INVALID,
1000                         &m->polkit_registry,
1001                         error);
1002         if (r < 0)
1003                 return r;
1004         if (r == 0)
1005                 return 1; /* Will call us back */
1006
1007         r = session_send_lock_all(m, streq(sd_bus_message_get_member(message), "LockSessions"));
1008         if (r < 0)
1009                 return r;
1010
1011         return sd_bus_reply_method_return(message, NULL);
1012 }
1013
1014 static int method_kill_session(sd_bus_message *message, void *userdata, sd_bus_error *error) {
1015         const char *name;
1016         Manager *m = userdata;
1017         Session *session;
1018         int r;
1019
1020         assert(message);
1021         assert(m);
1022
1023         r = sd_bus_message_read(message, "s", &name);
1024         if (r < 0)
1025                 return r;
1026
1027         r = manager_get_session_from_creds(m, message, name, error, &session);
1028         if (r < 0)
1029                 return r;
1030
1031         return bus_session_method_kill(message, session, error);
1032 }
1033
1034 static int method_kill_user(sd_bus_message *message, void *userdata, sd_bus_error *error) {
1035         Manager *m = userdata;
1036         uint32_t uid;
1037         User *user;
1038         int r;
1039
1040         assert(message);
1041         assert(m);
1042
1043         r = sd_bus_message_read(message, "u", &uid);
1044         if (r < 0)
1045                 return r;
1046
1047         r = manager_get_user_from_creds(m, message, uid, error, &user);
1048         if (r < 0)
1049                 return r;
1050
1051         return bus_user_method_kill(message, user, error);
1052 }
1053
1054 static int method_terminate_session(sd_bus_message *message, void *userdata, sd_bus_error *error) {
1055         Manager *m = userdata;
1056         const char *name;
1057         Session *session;
1058         int r;
1059
1060         assert(message);
1061         assert(m);
1062
1063         r = sd_bus_message_read(message, "s", &name);
1064         if (r < 0)
1065                 return r;
1066
1067         r = manager_get_session_from_creds(m, message, name, error, &session);
1068         if (r < 0)
1069                 return r;
1070
1071         return bus_session_method_terminate(message, session, error);
1072 }
1073
1074 static int method_terminate_user(sd_bus_message *message, void *userdata, sd_bus_error *error) {
1075         Manager *m = userdata;
1076         uint32_t uid;
1077         User *user;
1078         int r;
1079
1080         assert(message);
1081         assert(m);
1082
1083         r = sd_bus_message_read(message, "u", &uid);
1084         if (r < 0)
1085                 return r;
1086
1087         r = manager_get_user_from_creds(m, message, uid, error, &user);
1088         if (r < 0)
1089                 return r;
1090
1091         return bus_user_method_terminate(message, user, error);
1092 }
1093
1094 static int method_terminate_seat(sd_bus_message *message, void *userdata, sd_bus_error *error) {
1095         Manager *m = userdata;
1096         const char *name;
1097         Seat *seat;
1098         int r;
1099
1100         assert(message);
1101         assert(m);
1102
1103         r = sd_bus_message_read(message, "s", &name);
1104         if (r < 0)
1105                 return r;
1106
1107         r = manager_get_seat_from_creds(m, message, name, error, &seat);
1108         if (r < 0)
1109                 return r;
1110
1111         return bus_seat_method_terminate(message, seat, error);
1112 }
1113
1114 static int method_set_user_linger(sd_bus_message *message, void *userdata, sd_bus_error *error) {
1115         _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
1116         _cleanup_free_ char *cc = NULL;
1117         Manager *m = userdata;
1118         int r, b, interactive;
1119         struct passwd *pw;
1120         const char *path;
1121         uint32_t uid, auth_uid;
1122
1123         assert(message);
1124         assert(m);
1125
1126         r = sd_bus_message_read(message, "ubb", &uid, &b, &interactive);
1127         if (r < 0)
1128                 return r;
1129
1130         r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_EUID |
1131                                                SD_BUS_CREDS_OWNER_UID|SD_BUS_CREDS_AUGMENT, &creds);
1132         if (r < 0)
1133                 return r;
1134
1135         if (!uid_is_valid(uid)) {
1136                 /* Note that we get the owner UID of the session or user unit,
1137                  * not the actual client UID here! */
1138                 r = sd_bus_creds_get_owner_uid(creds, &uid);
1139                 if (r < 0)
1140                         return r;
1141         }
1142
1143         /* owner_uid is racy, so for authorization we must use euid */
1144         r = sd_bus_creds_get_euid(creds, &auth_uid);
1145         if (r < 0)
1146                 return r;
1147
1148         errno = 0;
1149         pw = getpwuid(uid);
1150         if (!pw)
1151                 return errno > 0 ? -errno : -ENOENT;
1152
1153         r = bus_verify_polkit_async(
1154                         message,
1155                         CAP_SYS_ADMIN,
1156                         uid == auth_uid ? "org.freedesktop.login1.set-self-linger" :
1157                                           "org.freedesktop.login1.set-user-linger",
1158                         NULL,
1159                         interactive,
1160                         UID_INVALID,
1161                         &m->polkit_registry,
1162                         error);
1163         if (r < 0)
1164                 return r;
1165         if (r == 0)
1166                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
1167
1168         mkdir_p_label("/var/lib/systemd", 0755);
1169
1170         r = mkdir_safe_label("/var/lib/systemd/linger", 0755, 0, 0, MKDIR_WARN_MODE);
1171         if (r < 0)
1172                 return r;
1173
1174         cc = cescape(pw->pw_name);
1175         if (!cc)
1176                 return -ENOMEM;
1177
1178         path = strjoina("/var/lib/systemd/linger/", cc);
1179         if (b) {
1180                 User *u;
1181
1182                 r = touch(path);
1183                 if (r < 0)
1184                         return r;
1185
1186                 if (manager_add_user_by_uid(m, uid, &u) >= 0)
1187                         user_start(u);
1188
1189         } else {
1190                 User *u;
1191
1192                 r = unlink(path);
1193                 if (r < 0 && errno != ENOENT)
1194                         return -errno;
1195
1196                 u = hashmap_get(m->users, UID_TO_PTR(uid));
1197                 if (u)
1198                         user_add_to_gc_queue(u);
1199         }
1200
1201         return sd_bus_reply_method_return(message, NULL);
1202 }
1203
1204 static int trigger_device(Manager *m, sd_device *d) {
1205         _cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL;
1206         int r;
1207
1208         assert(m);
1209
1210         r = sd_device_enumerator_new(&e);
1211         if (r < 0)
1212                 return r;
1213
1214         r = sd_device_enumerator_allow_uninitialized(e);
1215         if (r < 0)
1216                 return r;
1217
1218         if (d) {
1219                 r = sd_device_enumerator_add_match_parent(e, d);
1220                 if (r < 0)
1221                         return r;
1222         }
1223
1224         FOREACH_DEVICE(e, d) {
1225                 _cleanup_free_ char *t = NULL;
1226                 const char *p;
1227
1228                 r = sd_device_get_syspath(d, &p);
1229                 if (r < 0)
1230                         return r;
1231
1232                 t = strappend(p, "/uevent");
1233                 if (!t)
1234                         return -ENOMEM;
1235
1236                 (void) write_string_file(t, "change", WRITE_STRING_FILE_DISABLE_BUFFER);
1237         }
1238
1239         return 0;
1240 }
1241
1242 static int attach_device(Manager *m, const char *seat, const char *sysfs) {
1243         _cleanup_(sd_device_unrefp) sd_device *d = NULL;
1244         _cleanup_free_ char *rule = NULL, *file = NULL;
1245         const char *id_for_seat;
1246         int r;
1247
1248         assert(m);
1249         assert(seat);
1250         assert(sysfs);
1251
1252         r = sd_device_new_from_syspath(&d, sysfs);
1253         if (r < 0)
1254                 return r;
1255
1256         if (sd_device_has_tag(d, "seat") <= 0)
1257                 return -ENODEV;
1258
1259         if (sd_device_get_property_value(d, "ID_FOR_SEAT", &id_for_seat) < 0)
1260                 return -ENODEV;
1261
1262         if (asprintf(&file, "/etc/udev/rules.d/72-seat-%s.rules", id_for_seat) < 0)
1263                 return -ENOMEM;
1264
1265         if (asprintf(&rule, "TAG==\"seat\", ENV{ID_FOR_SEAT}==\"%s\", ENV{ID_SEAT}=\"%s\"", id_for_seat, seat) < 0)
1266                 return -ENOMEM;
1267
1268         (void) mkdir_p_label("/etc/udev/rules.d", 0755);
1269         r = write_string_file_atomic_label(file, rule);
1270         if (r < 0)
1271                 return r;
1272
1273         return trigger_device(m, d);
1274 }
1275
1276 static int flush_devices(Manager *m) {
1277         _cleanup_closedir_ DIR *d;
1278
1279         assert(m);
1280
1281         d = opendir("/etc/udev/rules.d");
1282         if (!d) {
1283                 if (errno != ENOENT)
1284                         log_warning_errno(errno, "Failed to open /etc/udev/rules.d: %m");
1285         } else {
1286                 struct dirent *de;
1287
1288                 FOREACH_DIRENT_ALL(de, d, break) {
1289                         if (!dirent_is_file(de))
1290                                 continue;
1291
1292                         if (!startswith(de->d_name, "72-seat-"))
1293                                 continue;
1294
1295                         if (!endswith(de->d_name, ".rules"))
1296                                 continue;
1297
1298                         if (unlinkat(dirfd(d), de->d_name, 0) < 0)
1299                                 log_warning_errno(errno, "Failed to unlink %s: %m", de->d_name);
1300                 }
1301         }
1302
1303         return trigger_device(m, NULL);
1304 }
1305
1306 static int method_attach_device(sd_bus_message *message, void *userdata, sd_bus_error *error) {
1307         const char *sysfs, *seat;
1308         Manager *m = userdata;
1309         int interactive, r;
1310
1311         assert(message);
1312         assert(m);
1313
1314         r = sd_bus_message_read(message, "ssb", &seat, &sysfs, &interactive);
1315         if (r < 0)
1316                 return r;
1317
1318         if (!path_startswith(sysfs, "/sys"))
1319                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Path %s is not in /sys", sysfs);
1320
1321         if (!seat_name_is_valid(seat))
1322                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Seat %s is not valid", seat);
1323
1324         r = bus_verify_polkit_async(
1325                         message,
1326                         CAP_SYS_ADMIN,
1327                         "org.freedesktop.login1.attach-device",
1328                         NULL,
1329                         interactive,
1330                         UID_INVALID,
1331                         &m->polkit_registry,
1332                         error);
1333         if (r < 0)
1334                 return r;
1335         if (r == 0)
1336                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
1337
1338         r = attach_device(m, seat, sysfs);
1339         if (r < 0)
1340                 return r;
1341
1342         return sd_bus_reply_method_return(message, NULL);
1343 }
1344
1345 static int method_flush_devices(sd_bus_message *message, void *userdata, sd_bus_error *error) {
1346         Manager *m = userdata;
1347         int interactive, r;
1348
1349         assert(message);
1350         assert(m);
1351
1352         r = sd_bus_message_read(message, "b", &interactive);
1353         if (r < 0)
1354                 return r;
1355
1356         r = bus_verify_polkit_async(
1357                         message,
1358                         CAP_SYS_ADMIN,
1359                         "org.freedesktop.login1.flush-devices",
1360                         NULL,
1361                         interactive,
1362                         UID_INVALID,
1363                         &m->polkit_registry,
1364                         error);
1365         if (r < 0)
1366                 return r;
1367         if (r == 0)
1368                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
1369
1370         r = flush_devices(m);
1371         if (r < 0)
1372                 return r;
1373
1374         return sd_bus_reply_method_return(message, NULL);
1375 }
1376
1377 static int have_multiple_sessions(
1378                 Manager *m,
1379                 uid_t uid) {
1380
1381         Session *session;
1382         Iterator i;
1383
1384         assert(m);
1385
1386         /* Check for other users' sessions. Greeter sessions do not
1387          * count, and non-login sessions do not count either. */
1388         HASHMAP_FOREACH(session, m->sessions, i)
1389                 if (session->class == SESSION_USER &&
1390                     session->user->uid != uid)
1391                         return true;
1392
1393         return false;
1394 }
1395
1396 static int bus_manager_log_shutdown(
1397                 Manager *m,
1398                 const char *unit_name) {
1399
1400         const char *p, *q;
1401
1402         assert(m);
1403         assert(unit_name);
1404
1405         if (streq(unit_name, SPECIAL_POWEROFF_TARGET)) {
1406                 p = "MESSAGE=System is powering down";
1407                 q = "SHUTDOWN=power-off";
1408         } else if (streq(unit_name, SPECIAL_REBOOT_TARGET)) {
1409                 p = "MESSAGE=System is rebooting";
1410                 q = "SHUTDOWN=reboot";
1411         } else if (streq(unit_name, SPECIAL_HALT_TARGET)) {
1412                 p = "MESSAGE=System is halting";
1413                 q = "SHUTDOWN=halt";
1414         } else if (streq(unit_name, SPECIAL_KEXEC_TARGET)) {
1415                 p = "MESSAGE=System is rebooting with kexec";
1416                 q = "SHUTDOWN=kexec";
1417         } else {
1418                 p = "MESSAGE=System is shutting down";
1419                 q = NULL;
1420         }
1421
1422         if (isempty(m->wall_message))
1423                 p = strjoina(p, ".");
1424         else
1425                 p = strjoina(p, " (", m->wall_message, ").");
1426
1427         return log_struct(LOG_NOTICE,
1428                           "MESSAGE_ID=" SD_MESSAGE_SHUTDOWN_STR,
1429                           p,
1430                           q);
1431 }
1432
1433 static int lid_switch_ignore_handler(sd_event_source *e, uint64_t usec, void *userdata) {
1434         Manager *m = userdata;
1435
1436         assert(e);
1437         assert(m);
1438
1439         m->lid_switch_ignore_event_source = sd_event_source_unref(m->lid_switch_ignore_event_source);
1440         return 0;
1441 }
1442
1443 int manager_set_lid_switch_ignore(Manager *m, usec_t until) {
1444         int r;
1445
1446         assert(m);
1447
1448         if (until <= now(CLOCK_MONOTONIC))
1449                 return 0;
1450
1451         /* We want to ignore the lid switch for a while after each
1452          * suspend, and after boot-up. Hence let's install a timer for
1453          * this. As long as the event source exists we ignore the lid
1454          * switch. */
1455
1456         if (m->lid_switch_ignore_event_source) {
1457                 usec_t u;
1458
1459                 r = sd_event_source_get_time(m->lid_switch_ignore_event_source, &u);
1460                 if (r < 0)
1461                         return r;
1462
1463                 if (until <= u)
1464                         return 0;
1465
1466                 r = sd_event_source_set_time(m->lid_switch_ignore_event_source, until);
1467         } else
1468                 r = sd_event_add_time(
1469                                 m->event,
1470                                 &m->lid_switch_ignore_event_source,
1471                                 CLOCK_MONOTONIC,
1472                                 until, 0,
1473                                 lid_switch_ignore_handler, m);
1474
1475         return r;
1476 }
1477
1478 static int send_prepare_for(Manager *m, InhibitWhat w, bool _active) {
1479         int active = _active;
1480
1481         assert(m);
1482         assert(IN_SET(w, INHIBIT_SHUTDOWN, INHIBIT_SLEEP));
1483
1484         return sd_bus_emit_signal(m->bus,
1485                                   "/org/freedesktop/login1",
1486                                   "org.freedesktop.login1.Manager",
1487                                   w == INHIBIT_SHUTDOWN ? "PrepareForShutdown" : "PrepareForSleep",
1488                                   "b",
1489                                   active);
1490 }
1491
1492 static int execute_shutdown_or_sleep(
1493                 Manager *m,
1494                 InhibitWhat w,
1495                 const char *unit_name,
1496                 sd_bus_error *error) {
1497
1498         _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
1499         const char *p;
1500         int r;
1501
1502         assert(m);
1503         assert(w > 0);
1504         assert(w < _INHIBIT_WHAT_MAX);
1505         assert(unit_name);
1506
1507         if (w == INHIBIT_SHUTDOWN)
1508                 bus_manager_log_shutdown(m, unit_name);
1509
1510         r = sd_bus_call_method(
1511                         m->bus,
1512                         "org.freedesktop.systemd1",
1513                         "/org/freedesktop/systemd1",
1514                         "org.freedesktop.systemd1.Manager",
1515                         "StartUnit",
1516                         error,
1517                         &reply,
1518                         "ss", unit_name, "replace-irreversibly");
1519         if (r < 0)
1520                 goto error;
1521
1522         r = sd_bus_message_read(reply, "o", &p);
1523         if (r < 0)
1524                 goto error;
1525
1526         r = free_and_strdup(&m->action_job, p);
1527         if (r < 0)
1528                 goto error;
1529
1530         m->action_unit = unit_name;
1531         m->action_what = w;
1532
1533         /* Make sure the lid switch is ignored for a while */
1534         manager_set_lid_switch_ignore(m, now(CLOCK_MONOTONIC) + m->holdoff_timeout_usec);
1535
1536         return 0;
1537
1538 error:
1539         /* Tell people that they now may take a lock again */
1540         (void) send_prepare_for(m, w, false);
1541
1542         return r;
1543 }
1544
1545 int manager_dispatch_delayed(Manager *manager, bool timeout) {
1546
1547         _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
1548         Inhibitor *offending = NULL;
1549         int r;
1550
1551         assert(manager);
1552
1553         if (manager->action_what == 0 || manager->action_job)
1554                 return 0;
1555
1556         if (manager_is_inhibited(manager, manager->action_what, INHIBIT_DELAY, NULL, false, false, 0, &offending)) {
1557                 _cleanup_free_ char *comm = NULL, *u = NULL;
1558
1559                 if (!timeout)
1560                         return 0;
1561
1562                 (void) get_process_comm(offending->pid, &comm);
1563                 u = uid_to_name(offending->uid);
1564
1565                 log_notice("Delay lock is active (UID "UID_FMT"/%s, PID "PID_FMT"/%s) but inhibitor timeout is reached.",
1566                            offending->uid, strna(u),
1567                            offending->pid, strna(comm));
1568         }
1569
1570         /* Actually do the operation */
1571         r = execute_shutdown_or_sleep(manager, manager->action_what, manager->action_unit, &error);
1572         if (r < 0) {
1573                 log_warning("Error during inhibitor-delayed operation (already returned success to client): %s",
1574                             bus_error_message(&error, r));
1575
1576                 manager->action_unit = NULL;
1577                 manager->action_what = 0;
1578                 return r;
1579         }
1580
1581         return 1;
1582 }
1583
1584 static int manager_inhibit_timeout_handler(
1585                         sd_event_source *s,
1586                         uint64_t usec,
1587                         void *userdata) {
1588
1589         Manager *manager = userdata;
1590         int r;
1591
1592         assert(manager);
1593         assert(manager->inhibit_timeout_source == s);
1594
1595         r = manager_dispatch_delayed(manager, true);
1596         return (r < 0) ? r : 0;
1597 }
1598
1599 static int delay_shutdown_or_sleep(
1600                 Manager *m,
1601                 InhibitWhat w,
1602                 const char *unit_name) {
1603
1604         int r;
1605         usec_t timeout_val;
1606
1607         assert(m);
1608         assert(w >= 0);
1609         assert(w < _INHIBIT_WHAT_MAX);
1610         assert(unit_name);
1611
1612         timeout_val = now(CLOCK_MONOTONIC) + m->inhibit_delay_max;
1613
1614         if (m->inhibit_timeout_source) {
1615                 r = sd_event_source_set_time(m->inhibit_timeout_source, timeout_val);
1616                 if (r < 0)
1617                         return log_error_errno(r, "sd_event_source_set_time() failed: %m");
1618
1619                 r = sd_event_source_set_enabled(m->inhibit_timeout_source, SD_EVENT_ONESHOT);
1620                 if (r < 0)
1621                         return log_error_errno(r, "sd_event_source_set_enabled() failed: %m");
1622         } else {
1623                 r = sd_event_add_time(m->event, &m->inhibit_timeout_source, CLOCK_MONOTONIC,
1624                                       timeout_val, 0, manager_inhibit_timeout_handler, m);
1625                 if (r < 0)
1626                         return r;
1627         }
1628
1629         m->action_unit = unit_name;
1630         m->action_what = w;
1631
1632         return 0;
1633 }
1634
1635 int bus_manager_shutdown_or_sleep_now_or_later(
1636                 Manager *m,
1637                 const char *unit_name,
1638                 InhibitWhat w,
1639                 sd_bus_error *error) {
1640
1641         _cleanup_free_ char *load_state = NULL;
1642         bool delayed;
1643         int r;
1644
1645         assert(m);
1646         assert(unit_name);
1647         assert(w > 0);
1648         assert(w < _INHIBIT_WHAT_MAX);
1649         assert(!m->action_job);
1650
1651         r = unit_load_state(m->bus, unit_name, &load_state);
1652         if (r < 0)
1653                 return r;
1654
1655         if (!streq(load_state, "loaded"))
1656                 return log_notice_errno(SYNTHETIC_ERRNO(EACCES),
1657                                         "Unit %s is %s, refusing operation.",
1658                                         unit_name, load_state);
1659
1660         /* Tell everybody to prepare for shutdown/sleep */
1661         (void) send_prepare_for(m, w, true);
1662
1663         delayed =
1664                 m->inhibit_delay_max > 0 &&
1665                 manager_is_inhibited(m, w, INHIBIT_DELAY, NULL, false, false, 0, NULL);
1666
1667         if (delayed)
1668                 /* Shutdown is delayed, keep in mind what we
1669                  * want to do, and start a timeout */
1670                 r = delay_shutdown_or_sleep(m, w, unit_name);
1671         else
1672                 /* Shutdown is not delayed, execute it
1673                  * immediately */
1674                 r = execute_shutdown_or_sleep(m, w, unit_name, error);
1675
1676         return r;
1677 }
1678
1679 static int verify_shutdown_creds(
1680                 Manager *m,
1681                 sd_bus_message *message,
1682                 InhibitWhat w,
1683                 bool interactive,
1684                 const char *action,
1685                 const char *action_multiple_sessions,
1686                 const char *action_ignore_inhibit,
1687                 sd_bus_error *error) {
1688
1689         _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
1690         bool multiple_sessions, blocked;
1691         uid_t uid;
1692         int r;
1693
1694         assert(m);
1695         assert(message);
1696         assert(w >= 0);
1697         assert(w <= _INHIBIT_WHAT_MAX);
1698
1699         r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_EUID, &creds);
1700         if (r < 0)
1701                 return r;
1702
1703         r = sd_bus_creds_get_euid(creds, &uid);
1704         if (r < 0)
1705                 return r;
1706
1707         r = have_multiple_sessions(m, uid);
1708         if (r < 0)
1709                 return r;
1710
1711         multiple_sessions = r > 0;
1712         blocked = manager_is_inhibited(m, w, INHIBIT_BLOCK, NULL, false, true, uid, NULL);
1713
1714         if (multiple_sessions && action_multiple_sessions) {
1715                 r = bus_verify_polkit_async(message, CAP_SYS_BOOT, action_multiple_sessions, NULL, interactive, UID_INVALID, &m->polkit_registry, error);
1716                 if (r < 0)
1717                         return r;
1718                 if (r == 0)
1719                         return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
1720         }
1721
1722         if (blocked && action_ignore_inhibit) {
1723                 r = bus_verify_polkit_async(message, CAP_SYS_BOOT, action_ignore_inhibit, NULL, interactive, UID_INVALID, &m->polkit_registry, error);
1724                 if (r < 0)
1725                         return r;
1726                 if (r == 0)
1727                         return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
1728         }
1729
1730         if (!multiple_sessions && !blocked && action) {
1731                 r = bus_verify_polkit_async(message, CAP_SYS_BOOT, action, NULL, interactive, UID_INVALID, &m->polkit_registry, error);
1732                 if (r < 0)
1733                         return r;
1734                 if (r == 0)
1735                         return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
1736         }
1737
1738         return 0;
1739 }
1740
1741 static int method_do_shutdown_or_sleep(
1742                 Manager *m,
1743                 sd_bus_message *message,
1744                 const char *unit_name,
1745                 InhibitWhat w,
1746                 const char *action,
1747                 const char *action_multiple_sessions,
1748                 const char *action_ignore_inhibit,
1749                 const char *sleep_verb,
1750                 sd_bus_error *error) {
1751
1752         int interactive, r;
1753
1754         assert(m);
1755         assert(message);
1756         assert(unit_name);
1757         assert(w >= 0);
1758         assert(w <= _INHIBIT_WHAT_MAX);
1759
1760         r = sd_bus_message_read(message, "b", &interactive);
1761         if (r < 0)
1762                 return r;
1763
1764         /* Don't allow multiple jobs being executed at the same time */
1765         if (m->action_what > 0)
1766                 return sd_bus_error_setf(error, BUS_ERROR_OPERATION_IN_PROGRESS, "There's already a shutdown or sleep operation in progress");
1767
1768         if (sleep_verb) {
1769                 r = can_sleep(sleep_verb);
1770                 if (r == -ENOSPC)
1771                         return sd_bus_error_set(error, BUS_ERROR_SLEEP_VERB_NOT_SUPPORTED,
1772                                                 "Not enough swap space for hibernation");
1773                 if (r == 0)
1774                         return sd_bus_error_setf(error, BUS_ERROR_SLEEP_VERB_NOT_SUPPORTED,
1775                                                  "Sleep verb \"%s\" not supported", sleep_verb);
1776                 if (r < 0)
1777                         return r;
1778         }
1779
1780         r = verify_shutdown_creds(m, message, w, interactive, action, action_multiple_sessions,
1781                                   action_ignore_inhibit, error);
1782         if (r != 0)
1783                 return r;
1784
1785         r = bus_manager_shutdown_or_sleep_now_or_later(m, unit_name, w, error);
1786         if (r < 0)
1787                 return r;
1788
1789         return sd_bus_reply_method_return(message, NULL);
1790 }
1791
1792 static int method_poweroff(sd_bus_message *message, void *userdata, sd_bus_error *error) {
1793         Manager *m = userdata;
1794
1795         return method_do_shutdown_or_sleep(
1796                         m, message,
1797                         SPECIAL_POWEROFF_TARGET,
1798                         INHIBIT_SHUTDOWN,
1799                         "org.freedesktop.login1.power-off",
1800                         "org.freedesktop.login1.power-off-multiple-sessions",
1801                         "org.freedesktop.login1.power-off-ignore-inhibit",
1802                         NULL,
1803                         error);
1804 }
1805
1806 static int method_reboot(sd_bus_message *message, void *userdata, sd_bus_error *error) {
1807         Manager *m = userdata;
1808
1809         return method_do_shutdown_or_sleep(
1810                         m, message,
1811                         SPECIAL_REBOOT_TARGET,
1812                         INHIBIT_SHUTDOWN,
1813                         "org.freedesktop.login1.reboot",
1814                         "org.freedesktop.login1.reboot-multiple-sessions",
1815                         "org.freedesktop.login1.reboot-ignore-inhibit",
1816                         NULL,
1817                         error);
1818 }
1819
1820 static int method_halt(sd_bus_message *message, void *userdata, sd_bus_error *error) {
1821         Manager *m = userdata;
1822
1823         return method_do_shutdown_or_sleep(
1824                         m, message,
1825                         SPECIAL_HALT_TARGET,
1826                         INHIBIT_SHUTDOWN,
1827                         "org.freedesktop.login1.halt",
1828                         "org.freedesktop.login1.halt-multiple-sessions",
1829                         "org.freedesktop.login1.halt-ignore-inhibit",
1830                         NULL,
1831                         error);
1832 }
1833
1834 static int method_suspend(sd_bus_message *message, void *userdata, sd_bus_error *error) {
1835         Manager *m = userdata;
1836
1837         return method_do_shutdown_or_sleep(
1838                         m, message,
1839                         SPECIAL_SUSPEND_TARGET,
1840                         INHIBIT_SLEEP,
1841                         "org.freedesktop.login1.suspend",
1842                         "org.freedesktop.login1.suspend-multiple-sessions",
1843                         "org.freedesktop.login1.suspend-ignore-inhibit",
1844                         "suspend",
1845                         error);
1846 }
1847
1848 static int method_hibernate(sd_bus_message *message, void *userdata, sd_bus_error *error) {
1849         Manager *m = userdata;
1850
1851         return method_do_shutdown_or_sleep(
1852                         m, message,
1853                         SPECIAL_HIBERNATE_TARGET,
1854                         INHIBIT_SLEEP,
1855                         "org.freedesktop.login1.hibernate",
1856                         "org.freedesktop.login1.hibernate-multiple-sessions",
1857                         "org.freedesktop.login1.hibernate-ignore-inhibit",
1858                         "hibernate",
1859                         error);
1860 }
1861
1862 static int method_hybrid_sleep(sd_bus_message *message, void *userdata, sd_bus_error *error) {
1863         Manager *m = userdata;
1864
1865         return method_do_shutdown_or_sleep(
1866                         m, message,
1867                         SPECIAL_HYBRID_SLEEP_TARGET,
1868                         INHIBIT_SLEEP,
1869                         "org.freedesktop.login1.hibernate",
1870                         "org.freedesktop.login1.hibernate-multiple-sessions",
1871                         "org.freedesktop.login1.hibernate-ignore-inhibit",
1872                         "hybrid-sleep",
1873                         error);
1874 }
1875
1876 static int method_suspend_then_hibernate(sd_bus_message *message, void *userdata, sd_bus_error *error) {
1877         Manager *m = userdata;
1878
1879         return method_do_shutdown_or_sleep(
1880                         m, message,
1881                         SPECIAL_SUSPEND_THEN_HIBERNATE_TARGET,
1882                         INHIBIT_SLEEP,
1883                         "org.freedesktop.login1.hibernate",
1884                         "org.freedesktop.login1.hibernate-multiple-sessions",
1885                         "org.freedesktop.login1.hibernate-ignore-inhibit",
1886                         "hybrid-sleep",
1887                         error);
1888 }
1889
1890 static int nologin_timeout_handler(
1891                         sd_event_source *s,
1892                         uint64_t usec,
1893                         void *userdata) {
1894
1895         Manager *m = userdata;
1896
1897         log_info("Creating /run/nologin, blocking further logins...");
1898
1899         m->unlink_nologin =
1900                 create_shutdown_run_nologin_or_warn() >= 0;
1901
1902         return 0;
1903 }
1904
1905 static int update_schedule_file(Manager *m) {
1906         _cleanup_free_ char *temp_path = NULL;
1907         _cleanup_fclose_ FILE *f = NULL;
1908         int r;
1909
1910         assert(m);
1911
1912         r = mkdir_safe_label("/run/systemd/shutdown", 0755, 0, 0, MKDIR_WARN_MODE);
1913         if (r < 0)
1914                 return log_error_errno(r, "Failed to create shutdown subdirectory: %m");
1915
1916         r = fopen_temporary("/run/systemd/shutdown/scheduled", &f, &temp_path);
1917         if (r < 0)
1918                 return log_error_errno(r, "Failed to save information about scheduled shutdowns: %m");
1919
1920         (void) fchmod(fileno(f), 0644);
1921
1922         fprintf(f,
1923                 "USEC="USEC_FMT"\n"
1924                 "WARN_WALL=%i\n"
1925                 "MODE=%s\n",
1926                 m->scheduled_shutdown_timeout,
1927                 m->enable_wall_messages,
1928                 m->scheduled_shutdown_type);
1929
1930         if (!isempty(m->wall_message)) {
1931                 _cleanup_free_ char *t;
1932
1933                 t = cescape(m->wall_message);
1934                 if (!t) {
1935                         r = -ENOMEM;
1936                         goto fail;
1937                 }
1938
1939                 fprintf(f, "WALL_MESSAGE=%s\n", t);
1940         }
1941
1942         r = fflush_and_check(f);
1943         if (r < 0)
1944                 goto fail;
1945
1946         if (rename(temp_path, "/run/systemd/shutdown/scheduled") < 0) {
1947                 r = -errno;
1948                 goto fail;
1949         }
1950
1951         return 0;
1952
1953 fail:
1954         (void) unlink(temp_path);
1955         (void) unlink("/run/systemd/shutdown/scheduled");
1956
1957         return log_error_errno(r, "Failed to write information about scheduled shutdowns: %m");
1958 }
1959
1960 static void reset_scheduled_shutdown(Manager *m) {
1961         assert(m);
1962
1963         m->scheduled_shutdown_timeout_source = sd_event_source_unref(m->scheduled_shutdown_timeout_source);
1964         m->wall_message_timeout_source = sd_event_source_unref(m->wall_message_timeout_source);
1965         m->nologin_timeout_source = sd_event_source_unref(m->nologin_timeout_source);
1966
1967         m->scheduled_shutdown_type = mfree(m->scheduled_shutdown_type);
1968         m->scheduled_shutdown_timeout = 0;
1969         m->shutdown_dry_run = false;
1970
1971         if (m->unlink_nologin) {
1972                 (void) unlink_or_warn("/run/nologin");
1973                 m->unlink_nologin = false;
1974         }
1975
1976         (void) unlink("/run/systemd/shutdown/scheduled");
1977 }
1978
1979 static int manager_scheduled_shutdown_handler(
1980                         sd_event_source *s,
1981                         uint64_t usec,
1982                         void *userdata) {
1983
1984         _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
1985         Manager *m = userdata;
1986         const char *target;
1987         int r;
1988
1989         assert(m);
1990
1991         if (isempty(m->scheduled_shutdown_type))
1992                 return 0;
1993
1994         if (streq(m->scheduled_shutdown_type, "poweroff"))
1995                 target = SPECIAL_POWEROFF_TARGET;
1996         else if (streq(m->scheduled_shutdown_type, "reboot"))
1997                 target = SPECIAL_REBOOT_TARGET;
1998         else if (streq(m->scheduled_shutdown_type, "halt"))
1999                 target = SPECIAL_HALT_TARGET;
2000         else
2001                 assert_not_reached("unexpected shutdown type");
2002
2003         /* Don't allow multiple jobs being executed at the same time */
2004         if (m->action_what > 0) {
2005                 r = -EALREADY;
2006                 log_error("Scheduled shutdown to %s failed: shutdown or sleep operation already in progress", target);
2007                 goto error;
2008         }
2009
2010         if (m->shutdown_dry_run) {
2011                 /* We do not process delay inhibitors here.  Otherwise, we
2012                  * would have to be considered "in progress" (like the check
2013                  * above) for some seconds after our admin has seen the final
2014                  * wall message. */
2015
2016                 bus_manager_log_shutdown(m, target);
2017                 log_info("Running in dry run, suppressing action.");
2018                 reset_scheduled_shutdown(m);
2019
2020                 return 0;
2021         }
2022
2023         r = bus_manager_shutdown_or_sleep_now_or_later(m, target, INHIBIT_SHUTDOWN, &error);
2024         if (r < 0) {
2025                 log_error_errno(r, "Scheduled shutdown to %s failed: %m", target);
2026                 goto error;
2027         }
2028
2029         return 0;
2030
2031 error:
2032         reset_scheduled_shutdown(m);
2033         return r;
2034 }
2035
2036 static int method_schedule_shutdown(sd_bus_message *message, void *userdata, sd_bus_error *error) {
2037         Manager *m = userdata;
2038         _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
2039         const char *action_multiple_sessions = NULL;
2040         const char *action_ignore_inhibit = NULL;
2041         const char *action = NULL;
2042         uint64_t elapse;
2043         char *type;
2044         int r;
2045         bool dry_run = false;
2046
2047         assert(m);
2048         assert(message);
2049
2050         r = sd_bus_message_read(message, "st", &type, &elapse);
2051         if (r < 0)
2052                 return r;
2053
2054         if (startswith(type, "dry-")) {
2055                 type += 4;
2056                 dry_run = true;
2057         }
2058
2059         if (streq(type, "poweroff")) {
2060                 action = "org.freedesktop.login1.power-off";
2061                 action_multiple_sessions = "org.freedesktop.login1.power-off-multiple-sessions";
2062                 action_ignore_inhibit = "org.freedesktop.login1.power-off-ignore-inhibit";
2063         } else if (streq(type, "reboot")) {
2064                 action = "org.freedesktop.login1.reboot";
2065                 action_multiple_sessions = "org.freedesktop.login1.reboot-multiple-sessions";
2066                 action_ignore_inhibit = "org.freedesktop.login1.reboot-ignore-inhibit";
2067         } else if (streq(type, "halt")) {
2068                 action = "org.freedesktop.login1.halt";
2069                 action_multiple_sessions = "org.freedesktop.login1.halt-multiple-sessions";
2070                 action_ignore_inhibit = "org.freedesktop.login1.halt-ignore-inhibit";
2071         } else
2072                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Unsupported shutdown type");
2073
2074         r = verify_shutdown_creds(m, message, INHIBIT_SHUTDOWN, false,
2075                                   action, action_multiple_sessions, action_ignore_inhibit, error);
2076         if (r != 0)
2077                 return r;
2078
2079         if (m->scheduled_shutdown_timeout_source) {
2080                 r = sd_event_source_set_time(m->scheduled_shutdown_timeout_source, elapse);
2081                 if (r < 0)
2082                         return log_error_errno(r, "sd_event_source_set_time() failed: %m");
2083
2084                 r = sd_event_source_set_enabled(m->scheduled_shutdown_timeout_source, SD_EVENT_ONESHOT);
2085                 if (r < 0)
2086                         return log_error_errno(r, "sd_event_source_set_enabled() failed: %m");
2087         } else {
2088                 r = sd_event_add_time(m->event, &m->scheduled_shutdown_timeout_source,
2089                                       CLOCK_REALTIME, elapse, 0, manager_scheduled_shutdown_handler, m);
2090                 if (r < 0)
2091                         return log_error_errno(r, "sd_event_add_time() failed: %m");
2092         }
2093
2094         r = free_and_strdup(&m->scheduled_shutdown_type, type);
2095         if (r < 0) {
2096                 m->scheduled_shutdown_timeout_source = sd_event_source_unref(m->scheduled_shutdown_timeout_source);
2097                 return log_oom();
2098         }
2099
2100         m->shutdown_dry_run = dry_run;
2101
2102         if (m->nologin_timeout_source) {
2103                 r = sd_event_source_set_time(m->nologin_timeout_source, elapse);
2104                 if (r < 0)
2105                         return log_error_errno(r, "sd_event_source_set_time() failed: %m");
2106
2107                 r = sd_event_source_set_enabled(m->nologin_timeout_source, SD_EVENT_ONESHOT);
2108                 if (r < 0)
2109                         return log_error_errno(r, "sd_event_source_set_enabled() failed: %m");
2110         } else {
2111                 r = sd_event_add_time(m->event, &m->nologin_timeout_source,
2112                                       CLOCK_REALTIME, elapse - 5 * USEC_PER_MINUTE, 0, nologin_timeout_handler, m);
2113                 if (r < 0)
2114                         return log_error_errno(r, "sd_event_add_time() failed: %m");
2115         }
2116
2117         m->scheduled_shutdown_timeout = elapse;
2118
2119         r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_AUGMENT|SD_BUS_CREDS_TTY|SD_BUS_CREDS_UID, &creds);
2120         if (r >= 0) {
2121                 const char *tty = NULL;
2122
2123                 (void) sd_bus_creds_get_uid(creds, &m->scheduled_shutdown_uid);
2124                 (void) sd_bus_creds_get_tty(creds, &tty);
2125
2126                 r = free_and_strdup(&m->scheduled_shutdown_tty, tty);
2127                 if (r < 0) {
2128                         m->scheduled_shutdown_timeout_source = sd_event_source_unref(m->scheduled_shutdown_timeout_source);
2129                         return log_oom();
2130                 }
2131         }
2132
2133         r = manager_setup_wall_message_timer(m);
2134         if (r < 0)
2135                 return r;
2136
2137         r = update_schedule_file(m);
2138         if (r < 0)
2139                 return r;
2140
2141         return sd_bus_reply_method_return(message, NULL);
2142 }
2143
2144 static int method_cancel_scheduled_shutdown(sd_bus_message *message, void *userdata, sd_bus_error *error) {
2145         Manager *m = userdata;
2146         bool cancelled;
2147
2148         assert(m);
2149         assert(message);
2150
2151         cancelled = m->scheduled_shutdown_type != NULL;
2152         reset_scheduled_shutdown(m);
2153
2154         if (cancelled && m->enable_wall_messages) {
2155                 _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
2156                 _cleanup_free_ char *username = NULL;
2157                 const char *tty = NULL;
2158                 uid_t uid = 0;
2159                 int r;
2160
2161                 r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_AUGMENT|SD_BUS_CREDS_TTY|SD_BUS_CREDS_UID, &creds);
2162                 if (r >= 0) {
2163                         (void) sd_bus_creds_get_uid(creds, &uid);
2164                         (void) sd_bus_creds_get_tty(creds, &tty);
2165                 }
2166
2167                 username = uid_to_name(uid);
2168                 utmp_wall("The system shutdown has been cancelled",
2169                           username, tty, logind_wall_tty_filter, m);
2170         }
2171
2172         return sd_bus_reply_method_return(message, "b", cancelled);
2173 }
2174
2175 static int method_can_shutdown_or_sleep(
2176                 Manager *m,
2177                 sd_bus_message *message,
2178                 InhibitWhat w,
2179                 const char *action,
2180                 const char *action_multiple_sessions,
2181                 const char *action_ignore_inhibit,
2182                 const char *sleep_verb,
2183                 sd_bus_error *error) {
2184
2185         _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
2186         HandleAction handle;
2187         bool multiple_sessions, challenge, blocked;
2188         const char *result = NULL;
2189         uid_t uid;
2190         int r;
2191
2192         assert(m);
2193         assert(message);
2194         assert(w >= 0);
2195         assert(w <= _INHIBIT_WHAT_MAX);
2196         assert(action);
2197         assert(action_multiple_sessions);
2198         assert(action_ignore_inhibit);
2199
2200         if (sleep_verb) {
2201                 r = can_sleep(sleep_verb);
2202                 if (IN_SET(r,  0, -ENOSPC))
2203                         return sd_bus_reply_method_return(message, "s", "na");
2204                 if (r < 0)
2205                         return r;
2206         }
2207
2208         r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_EUID, &creds);
2209         if (r < 0)
2210                 return r;
2211
2212         r = sd_bus_creds_get_euid(creds, &uid);
2213         if (r < 0)
2214                 return r;
2215
2216         r = have_multiple_sessions(m, uid);
2217         if (r < 0)
2218                 return r;
2219
2220         multiple_sessions = r > 0;
2221         blocked = manager_is_inhibited(m, w, INHIBIT_BLOCK, NULL, false, true, uid, NULL);
2222
2223         handle = handle_action_from_string(sleep_verb);
2224         if (handle >= 0) {
2225                 const char *target;
2226
2227                 target = manager_target_for_action(handle);
2228                 if (target) {
2229                         _cleanup_free_ char *load_state = NULL;
2230
2231                         r = unit_load_state(m->bus, target, &load_state);
2232                         if (r < 0)
2233                                 return r;
2234
2235                         if (!streq(load_state, "loaded")) {
2236                                 result = "no";
2237                                 goto finish;
2238                         }
2239                 }
2240         }
2241
2242         if (multiple_sessions) {
2243                 r = bus_test_polkit(message, CAP_SYS_BOOT, action_multiple_sessions, NULL, UID_INVALID, &challenge, error);
2244                 if (r < 0)
2245                         return r;
2246
2247                 if (r > 0)
2248                         result = "yes";
2249                 else if (challenge)
2250                         result = "challenge";
2251                 else
2252                         result = "no";
2253         }
2254
2255         if (blocked) {
2256                 r = bus_test_polkit(message, CAP_SYS_BOOT, action_ignore_inhibit, NULL, UID_INVALID, &challenge, error);
2257                 if (r < 0)
2258                         return r;
2259
2260                 if (r > 0) {
2261                         if (!result)
2262                                 result = "yes";
2263                 } else if (challenge) {
2264                         if (!result || streq(result, "yes"))
2265                                 result = "challenge";
2266                 } else
2267                         result = "no";
2268         }
2269
2270         if (!multiple_sessions && !blocked) {
2271                 /* If neither inhibit nor multiple sessions
2272                  * apply then just check the normal policy */
2273
2274                 r = bus_test_polkit(message, CAP_SYS_BOOT, action, NULL, UID_INVALID, &challenge, error);
2275                 if (r < 0)
2276                         return r;
2277
2278                 if (r > 0)
2279                         result = "yes";
2280                 else if (challenge)
2281                         result = "challenge";
2282                 else
2283                         result = "no";
2284         }
2285
2286  finish:
2287         return sd_bus_reply_method_return(message, "s", result);
2288 }
2289
2290 static int method_can_poweroff(sd_bus_message *message, void *userdata, sd_bus_error *error) {
2291         Manager *m = userdata;
2292
2293         return method_can_shutdown_or_sleep(
2294                         m, message,
2295                         INHIBIT_SHUTDOWN,
2296                         "org.freedesktop.login1.power-off",
2297                         "org.freedesktop.login1.power-off-multiple-sessions",
2298                         "org.freedesktop.login1.power-off-ignore-inhibit",
2299                         NULL,
2300                         error);
2301 }
2302
2303 static int method_can_reboot(sd_bus_message *message, void *userdata, sd_bus_error *error) {
2304         Manager *m = userdata;
2305
2306         return method_can_shutdown_or_sleep(
2307                         m, message,
2308                         INHIBIT_SHUTDOWN,
2309                         "org.freedesktop.login1.reboot",
2310                         "org.freedesktop.login1.reboot-multiple-sessions",
2311                         "org.freedesktop.login1.reboot-ignore-inhibit",
2312                         NULL,
2313                         error);
2314 }
2315
2316 static int method_can_halt(sd_bus_message *message, void *userdata, sd_bus_error *error) {
2317         Manager *m = userdata;
2318
2319         return method_can_shutdown_or_sleep(
2320                         m, message,
2321                         INHIBIT_SHUTDOWN,
2322                         "org.freedesktop.login1.halt",
2323                         "org.freedesktop.login1.halt-multiple-sessions",
2324                         "org.freedesktop.login1.halt-ignore-inhibit",
2325                         NULL,
2326                         error);
2327 }
2328
2329 static int method_can_suspend(sd_bus_message *message, void *userdata, sd_bus_error *error) {
2330         Manager *m = userdata;
2331
2332         return method_can_shutdown_or_sleep(
2333                         m, message,
2334                         INHIBIT_SLEEP,
2335                         "org.freedesktop.login1.suspend",
2336                         "org.freedesktop.login1.suspend-multiple-sessions",
2337                         "org.freedesktop.login1.suspend-ignore-inhibit",
2338                         "suspend",
2339                         error);
2340 }
2341
2342 static int method_can_hibernate(sd_bus_message *message, void *userdata, sd_bus_error *error) {
2343         Manager *m = userdata;
2344
2345         return method_can_shutdown_or_sleep(
2346                         m, message,
2347                         INHIBIT_SLEEP,
2348                         "org.freedesktop.login1.hibernate",
2349                         "org.freedesktop.login1.hibernate-multiple-sessions",
2350                         "org.freedesktop.login1.hibernate-ignore-inhibit",
2351                         "hibernate",
2352                         error);
2353 }
2354
2355 static int method_can_hybrid_sleep(sd_bus_message *message, void *userdata, sd_bus_error *error) {
2356         Manager *m = userdata;
2357
2358         return method_can_shutdown_or_sleep(
2359                         m, message,
2360                         INHIBIT_SLEEP,
2361                         "org.freedesktop.login1.hibernate",
2362                         "org.freedesktop.login1.hibernate-multiple-sessions",
2363                         "org.freedesktop.login1.hibernate-ignore-inhibit",
2364                         "hybrid-sleep",
2365                         error);
2366 }
2367
2368 static int method_can_suspend_then_hibernate(sd_bus_message *message, void *userdata, sd_bus_error *error) {
2369         Manager *m = userdata;
2370
2371         return method_can_shutdown_or_sleep(
2372                         m, message,
2373                         INHIBIT_SLEEP,
2374                         "org.freedesktop.login1.hibernate",
2375                         "org.freedesktop.login1.hibernate-multiple-sessions",
2376                         "org.freedesktop.login1.hibernate-ignore-inhibit",
2377                         "suspend-then-hibernate",
2378                         error);
2379 }
2380
2381 static int property_get_reboot_to_firmware_setup(
2382                 sd_bus *bus,
2383                 const char *path,
2384                 const char *interface,
2385                 const char *property,
2386                 sd_bus_message *reply,
2387                 void *userdata,
2388                 sd_bus_error *error) {
2389         int r;
2390
2391         assert(bus);
2392         assert(reply);
2393         assert(userdata);
2394
2395         r = efi_get_reboot_to_firmware();
2396         if (r < 0 && r != -EOPNOTSUPP)
2397                 log_warning_errno(r, "Failed to determine reboot-to-firmware state: %m");
2398
2399         return sd_bus_message_append(reply, "b", r > 0);
2400 }
2401
2402 static int method_set_reboot_to_firmware_setup(
2403                 sd_bus_message *message,
2404                 void *userdata,
2405                 sd_bus_error *error) {
2406
2407         int b, r;
2408         Manager *m = userdata;
2409
2410         assert(message);
2411         assert(m);
2412
2413         r = sd_bus_message_read(message, "b", &b);
2414         if (r < 0)
2415                 return r;
2416
2417         r = bus_verify_polkit_async(message,
2418                                     CAP_SYS_ADMIN,
2419                                     "org.freedesktop.login1.set-reboot-to-firmware-setup",
2420                                     NULL,
2421                                     false,
2422                                     UID_INVALID,
2423                                     &m->polkit_registry,
2424                                     error);
2425         if (r < 0)
2426                 return r;
2427         if (r == 0)
2428                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
2429
2430         r = efi_set_reboot_to_firmware(b);
2431         if (r < 0)
2432                 return r;
2433
2434         return sd_bus_reply_method_return(message, NULL);
2435 }
2436
2437 static int method_can_reboot_to_firmware_setup(
2438                 sd_bus_message *message,
2439                 void *userdata,
2440                 sd_bus_error *error) {
2441
2442         int r;
2443         bool challenge;
2444         const char *result;
2445         Manager *m = userdata;
2446
2447         assert(message);
2448         assert(m);
2449
2450         r = efi_reboot_to_firmware_supported();
2451         if (r < 0) {
2452                 if (r != -EOPNOTSUPP)
2453                         log_warning_errno(r, "Failed to determine whether reboot to firmware is supported: %m");
2454
2455                 return sd_bus_reply_method_return(message, "s", "na");
2456         }
2457
2458         r = bus_test_polkit(message,
2459                             CAP_SYS_ADMIN,
2460                             "org.freedesktop.login1.set-reboot-to-firmware-setup",
2461                             NULL,
2462                             UID_INVALID,
2463                             &challenge,
2464                             error);
2465         if (r < 0)
2466                 return r;
2467
2468         if (r > 0)
2469                 result = "yes";
2470         else if (challenge)
2471                 result = "challenge";
2472         else
2473                 result = "no";
2474
2475         return sd_bus_reply_method_return(message, "s", result);
2476 }
2477
2478 static int method_set_wall_message(
2479                 sd_bus_message *message,
2480                 void *userdata,
2481                 sd_bus_error *error) {
2482
2483         int r;
2484         Manager *m = userdata;
2485         char *wall_message;
2486         unsigned enable_wall_messages;
2487
2488         assert(message);
2489         assert(m);
2490
2491         r = sd_bus_message_read(message, "sb", &wall_message, &enable_wall_messages);
2492         if (r < 0)
2493                 return r;
2494
2495         r = bus_verify_polkit_async(message,
2496                                     CAP_SYS_ADMIN,
2497                                     "org.freedesktop.login1.set-wall-message",
2498                                     NULL,
2499                                     false,
2500                                     UID_INVALID,
2501                                     &m->polkit_registry,
2502                                     error);
2503         if (r < 0)
2504                 return r;
2505         if (r == 0)
2506                 return 1; /* Will call us back */
2507
2508         r = free_and_strdup(&m->wall_message, empty_to_null(wall_message));
2509         if (r < 0)
2510                 return log_oom();
2511
2512         m->enable_wall_messages = enable_wall_messages;
2513
2514         return sd_bus_reply_method_return(message, NULL);
2515 }
2516
2517 static int method_inhibit(sd_bus_message *message, void *userdata, sd_bus_error *error) {
2518         _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
2519         const char *who, *why, *what, *mode;
2520         _cleanup_free_ char *id = NULL;
2521         _cleanup_close_ int fifo_fd = -1;
2522         Manager *m = userdata;
2523         Inhibitor *i = NULL;
2524         InhibitMode mm;
2525         InhibitWhat w;
2526         pid_t pid;
2527         uid_t uid;
2528         int r;
2529
2530         assert(message);
2531         assert(m);
2532
2533         r = sd_bus_message_read(message, "ssss", &what, &who, &why, &mode);
2534         if (r < 0)
2535                 return r;
2536
2537         w = inhibit_what_from_string(what);
2538         if (w <= 0)
2539                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid what specification %s", what);
2540
2541         mm = inhibit_mode_from_string(mode);
2542         if (mm < 0)
2543                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid mode specification %s", mode);
2544
2545         /* Delay is only supported for shutdown/sleep */
2546         if (mm == INHIBIT_DELAY && (w & ~(INHIBIT_SHUTDOWN|INHIBIT_SLEEP)))
2547                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Delay inhibitors only supported for shutdown and sleep");
2548
2549         /* Don't allow taking delay locks while we are already
2550          * executing the operation. We shouldn't create the impression
2551          * that the lock was successful if the machine is about to go
2552          * down/suspend any moment. */
2553         if (m->action_what & w)
2554                 return sd_bus_error_setf(error, BUS_ERROR_OPERATION_IN_PROGRESS, "The operation inhibition has been requested for is already running");
2555
2556         r = bus_verify_polkit_async(
2557                         message,
2558                         CAP_SYS_BOOT,
2559                         w == INHIBIT_SHUTDOWN             ? (mm == INHIBIT_BLOCK ? "org.freedesktop.login1.inhibit-block-shutdown" : "org.freedesktop.login1.inhibit-delay-shutdown") :
2560                         w == INHIBIT_SLEEP                ? (mm == INHIBIT_BLOCK ? "org.freedesktop.login1.inhibit-block-sleep"    : "org.freedesktop.login1.inhibit-delay-sleep") :
2561                         w == INHIBIT_IDLE                 ? "org.freedesktop.login1.inhibit-block-idle" :
2562                         w == INHIBIT_HANDLE_POWER_KEY     ? "org.freedesktop.login1.inhibit-handle-power-key" :
2563                         w == INHIBIT_HANDLE_SUSPEND_KEY   ? "org.freedesktop.login1.inhibit-handle-suspend-key" :
2564                         w == INHIBIT_HANDLE_HIBERNATE_KEY ? "org.freedesktop.login1.inhibit-handle-hibernate-key" :
2565                                                             "org.freedesktop.login1.inhibit-handle-lid-switch",
2566                         NULL,
2567                         false,
2568                         UID_INVALID,
2569                         &m->polkit_registry,
2570                         error);
2571         if (r < 0)
2572                 return r;
2573         if (r == 0)
2574                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
2575
2576         r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_EUID|SD_BUS_CREDS_PID, &creds);
2577         if (r < 0)
2578                 return r;
2579
2580         r = sd_bus_creds_get_euid(creds, &uid);
2581         if (r < 0)
2582                 return r;
2583
2584         r = sd_bus_creds_get_pid(creds, &pid);
2585         if (r < 0)
2586                 return r;
2587
2588         if (hashmap_size(m->inhibitors) >= m->inhibitors_max)
2589                 return sd_bus_error_setf(error, SD_BUS_ERROR_LIMITS_EXCEEDED, "Maximum number of inhibitors (%" PRIu64 ") reached, refusing further inhibitors.", m->inhibitors_max);
2590
2591         do {
2592                 id = mfree(id);
2593
2594                 if (asprintf(&id, "%lu", ++m->inhibit_counter) < 0)
2595                         return -ENOMEM;
2596
2597         } while (hashmap_get(m->inhibitors, id));
2598
2599         r = manager_add_inhibitor(m, id, &i);
2600         if (r < 0)
2601                 return r;
2602
2603         i->what = w;
2604         i->mode = mm;
2605         i->pid = pid;
2606         i->uid = uid;
2607         i->why = strdup(why);
2608         i->who = strdup(who);
2609
2610         if (!i->why || !i->who) {
2611                 r = -ENOMEM;
2612                 goto fail;
2613         }
2614
2615         fifo_fd = inhibitor_create_fifo(i);
2616         if (fifo_fd < 0) {
2617                 r = fifo_fd;
2618                 goto fail;
2619         }
2620
2621         inhibitor_start(i);
2622
2623         return sd_bus_reply_method_return(message, "h", fifo_fd);
2624
2625 fail:
2626         if (i)
2627                 inhibitor_free(i);
2628
2629         return r;
2630 }
2631
2632 const sd_bus_vtable manager_vtable[] = {
2633         SD_BUS_VTABLE_START(0),
2634
2635         SD_BUS_WRITABLE_PROPERTY("EnableWallMessages", "b", NULL, NULL, offsetof(Manager, enable_wall_messages), 0),
2636         SD_BUS_WRITABLE_PROPERTY("WallMessage", "s", NULL, NULL, offsetof(Manager, wall_message), 0),
2637
2638         SD_BUS_PROPERTY("NAutoVTs", "u", NULL, offsetof(Manager, n_autovts), SD_BUS_VTABLE_PROPERTY_CONST),
2639         SD_BUS_PROPERTY("KillOnlyUsers", "as", NULL, offsetof(Manager, kill_only_users), SD_BUS_VTABLE_PROPERTY_CONST),
2640         SD_BUS_PROPERTY("KillExcludeUsers", "as", NULL, offsetof(Manager, kill_exclude_users), SD_BUS_VTABLE_PROPERTY_CONST),
2641         SD_BUS_PROPERTY("KillUserProcesses", "b", NULL, offsetof(Manager, kill_user_processes), SD_BUS_VTABLE_PROPERTY_CONST),
2642         SD_BUS_PROPERTY("RebootToFirmwareSetup", "b", property_get_reboot_to_firmware_setup, 0, 0),
2643         SD_BUS_PROPERTY("IdleHint", "b", property_get_idle_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
2644         SD_BUS_PROPERTY("IdleSinceHint", "t", property_get_idle_since_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
2645         SD_BUS_PROPERTY("IdleSinceHintMonotonic", "t", property_get_idle_since_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
2646         SD_BUS_PROPERTY("BlockInhibited", "s", property_get_inhibited, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
2647         SD_BUS_PROPERTY("DelayInhibited", "s", property_get_inhibited, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
2648         SD_BUS_PROPERTY("InhibitDelayMaxUSec", "t", NULL, offsetof(Manager, inhibit_delay_max), SD_BUS_VTABLE_PROPERTY_CONST),
2649         SD_BUS_PROPERTY("UserStopDelayUSec", "t", NULL, offsetof(Manager, user_stop_delay), SD_BUS_VTABLE_PROPERTY_CONST),
2650         SD_BUS_PROPERTY("HandlePowerKey", "s", property_get_handle_action, offsetof(Manager, handle_power_key), SD_BUS_VTABLE_PROPERTY_CONST),
2651         SD_BUS_PROPERTY("HandleSuspendKey", "s", property_get_handle_action, offsetof(Manager, handle_suspend_key), SD_BUS_VTABLE_PROPERTY_CONST),
2652         SD_BUS_PROPERTY("HandleHibernateKey", "s", property_get_handle_action, offsetof(Manager, handle_hibernate_key), SD_BUS_VTABLE_PROPERTY_CONST),
2653         SD_BUS_PROPERTY("HandleLidSwitch", "s", property_get_handle_action, offsetof(Manager, handle_lid_switch), SD_BUS_VTABLE_PROPERTY_CONST),
2654         SD_BUS_PROPERTY("HandleLidSwitchExternalPower", "s", property_get_handle_action, offsetof(Manager, handle_lid_switch_ep), SD_BUS_VTABLE_PROPERTY_CONST),
2655         SD_BUS_PROPERTY("HandleLidSwitchDocked", "s", property_get_handle_action, offsetof(Manager, handle_lid_switch_docked), SD_BUS_VTABLE_PROPERTY_CONST),
2656         SD_BUS_PROPERTY("HoldoffTimeoutUSec", "t", NULL, offsetof(Manager, holdoff_timeout_usec), SD_BUS_VTABLE_PROPERTY_CONST),
2657         SD_BUS_PROPERTY("IdleAction", "s", property_get_handle_action, offsetof(Manager, idle_action), SD_BUS_VTABLE_PROPERTY_CONST),
2658         SD_BUS_PROPERTY("IdleActionUSec", "t", NULL, offsetof(Manager, idle_action_usec), SD_BUS_VTABLE_PROPERTY_CONST),
2659         SD_BUS_PROPERTY("PreparingForShutdown", "b", property_get_preparing, 0, 0),
2660         SD_BUS_PROPERTY("PreparingForSleep", "b", property_get_preparing, 0, 0),
2661         SD_BUS_PROPERTY("ScheduledShutdown", "(st)", property_get_scheduled_shutdown, 0, 0),
2662         SD_BUS_PROPERTY("Docked", "b", property_get_docked, 0, 0),
2663         SD_BUS_PROPERTY("LidClosed", "b", property_get_lid_closed, 0, 0),
2664         SD_BUS_PROPERTY("OnExternalPower", "b", property_get_on_external_power, 0, 0),
2665         SD_BUS_PROPERTY("RemoveIPC", "b", bus_property_get_bool, offsetof(Manager, remove_ipc), SD_BUS_VTABLE_PROPERTY_CONST),
2666         SD_BUS_PROPERTY("RuntimeDirectorySize", "t", NULL, offsetof(Manager, runtime_dir_size), SD_BUS_VTABLE_PROPERTY_CONST),
2667         SD_BUS_PROPERTY("InhibitorsMax", "t", NULL, offsetof(Manager, inhibitors_max), SD_BUS_VTABLE_PROPERTY_CONST),
2668         SD_BUS_PROPERTY("NCurrentInhibitors", "t", property_get_hashmap_size, offsetof(Manager, inhibitors), 0),
2669         SD_BUS_PROPERTY("SessionsMax", "t", NULL, offsetof(Manager, sessions_max), SD_BUS_VTABLE_PROPERTY_CONST),
2670         SD_BUS_PROPERTY("NCurrentSessions", "t", property_get_hashmap_size, offsetof(Manager, sessions), 0),
2671         SD_BUS_PROPERTY("UserTasksMax", "t", property_get_compat_user_tasks_max, 0, SD_BUS_VTABLE_PROPERTY_CONST|SD_BUS_VTABLE_HIDDEN),
2672
2673         SD_BUS_METHOD("GetSession", "s", "o", method_get_session, SD_BUS_VTABLE_UNPRIVILEGED),
2674         SD_BUS_METHOD("GetSessionByPID", "u", "o", method_get_session_by_pid, SD_BUS_VTABLE_UNPRIVILEGED),
2675         SD_BUS_METHOD("GetUser", "u", "o", method_get_user, SD_BUS_VTABLE_UNPRIVILEGED),
2676         SD_BUS_METHOD("GetUserByPID", "u", "o", method_get_user_by_pid, SD_BUS_VTABLE_UNPRIVILEGED),
2677         SD_BUS_METHOD("GetSeat", "s", "o", method_get_seat, SD_BUS_VTABLE_UNPRIVILEGED),
2678         SD_BUS_METHOD("ListSessions", NULL, "a(susso)", method_list_sessions, SD_BUS_VTABLE_UNPRIVILEGED),
2679         SD_BUS_METHOD("ListUsers", NULL, "a(uso)", method_list_users, SD_BUS_VTABLE_UNPRIVILEGED),
2680         SD_BUS_METHOD("ListSeats", NULL, "a(so)", method_list_seats, SD_BUS_VTABLE_UNPRIVILEGED),
2681         SD_BUS_METHOD("ListInhibitors", NULL, "a(ssssuu)", method_list_inhibitors, SD_BUS_VTABLE_UNPRIVILEGED),
2682         SD_BUS_METHOD("CreateSession", "uusssssussbssa(sv)", "soshusub", method_create_session, 0),
2683         SD_BUS_METHOD("ReleaseSession", "s", NULL, method_release_session, 0),
2684         SD_BUS_METHOD("ActivateSession", "s", NULL, method_activate_session, SD_BUS_VTABLE_UNPRIVILEGED),
2685         SD_BUS_METHOD("ActivateSessionOnSeat", "ss", NULL, method_activate_session_on_seat, SD_BUS_VTABLE_UNPRIVILEGED),
2686         SD_BUS_METHOD("LockSession", "s", NULL, method_lock_session, SD_BUS_VTABLE_UNPRIVILEGED),
2687         SD_BUS_METHOD("UnlockSession", "s", NULL, method_lock_session, SD_BUS_VTABLE_UNPRIVILEGED),
2688         SD_BUS_METHOD("LockSessions", NULL, NULL, method_lock_sessions, SD_BUS_VTABLE_UNPRIVILEGED),
2689         SD_BUS_METHOD("UnlockSessions", NULL, NULL, method_lock_sessions, SD_BUS_VTABLE_UNPRIVILEGED),
2690         SD_BUS_METHOD("KillSession", "ssi", NULL, method_kill_session, SD_BUS_VTABLE_UNPRIVILEGED),
2691         SD_BUS_METHOD("KillUser", "ui", NULL, method_kill_user, SD_BUS_VTABLE_UNPRIVILEGED),
2692         SD_BUS_METHOD("TerminateSession", "s", NULL, method_terminate_session, SD_BUS_VTABLE_UNPRIVILEGED),
2693         SD_BUS_METHOD("TerminateUser", "u", NULL, method_terminate_user, SD_BUS_VTABLE_UNPRIVILEGED),
2694         SD_BUS_METHOD("TerminateSeat", "s", NULL, method_terminate_seat, SD_BUS_VTABLE_UNPRIVILEGED),
2695         SD_BUS_METHOD("SetUserLinger", "ubb", NULL, method_set_user_linger, SD_BUS_VTABLE_UNPRIVILEGED),
2696         SD_BUS_METHOD("AttachDevice", "ssb", NULL, method_attach_device, SD_BUS_VTABLE_UNPRIVILEGED),
2697         SD_BUS_METHOD("FlushDevices", "b", NULL, method_flush_devices, SD_BUS_VTABLE_UNPRIVILEGED),
2698         SD_BUS_METHOD("PowerOff", "b", NULL, method_poweroff, SD_BUS_VTABLE_UNPRIVILEGED),
2699         SD_BUS_METHOD("Reboot", "b", NULL, method_reboot, SD_BUS_VTABLE_UNPRIVILEGED),
2700         SD_BUS_METHOD("Halt", "b", NULL, method_halt, SD_BUS_VTABLE_UNPRIVILEGED),
2701         SD_BUS_METHOD("Suspend", "b", NULL, method_suspend, SD_BUS_VTABLE_UNPRIVILEGED),
2702         SD_BUS_METHOD("Hibernate", "b", NULL, method_hibernate, SD_BUS_VTABLE_UNPRIVILEGED),
2703         SD_BUS_METHOD("HybridSleep", "b", NULL, method_hybrid_sleep, SD_BUS_VTABLE_UNPRIVILEGED),
2704         SD_BUS_METHOD("SuspendThenHibernate", "b", NULL, method_suspend_then_hibernate, SD_BUS_VTABLE_UNPRIVILEGED),
2705         SD_BUS_METHOD("CanPowerOff", NULL, "s", method_can_poweroff, SD_BUS_VTABLE_UNPRIVILEGED),
2706         SD_BUS_METHOD("CanReboot", NULL, "s", method_can_reboot, SD_BUS_VTABLE_UNPRIVILEGED),
2707         SD_BUS_METHOD("CanHalt", NULL, "s", method_can_halt, SD_BUS_VTABLE_UNPRIVILEGED),
2708         SD_BUS_METHOD("CanSuspend", NULL, "s", method_can_suspend, SD_BUS_VTABLE_UNPRIVILEGED),
2709         SD_BUS_METHOD("CanHibernate", NULL, "s", method_can_hibernate, SD_BUS_VTABLE_UNPRIVILEGED),
2710         SD_BUS_METHOD("CanHybridSleep", NULL, "s", method_can_hybrid_sleep, SD_BUS_VTABLE_UNPRIVILEGED),
2711         SD_BUS_METHOD("CanSuspendThenHibernate", NULL, "s", method_can_suspend_then_hibernate, SD_BUS_VTABLE_UNPRIVILEGED),
2712         SD_BUS_METHOD("ScheduleShutdown", "st", NULL, method_schedule_shutdown, SD_BUS_VTABLE_UNPRIVILEGED),
2713         SD_BUS_METHOD("CancelScheduledShutdown", NULL, "b", method_cancel_scheduled_shutdown, SD_BUS_VTABLE_UNPRIVILEGED),
2714         SD_BUS_METHOD("Inhibit", "ssss", "h", method_inhibit, SD_BUS_VTABLE_UNPRIVILEGED),
2715         SD_BUS_METHOD("CanRebootToFirmwareSetup", NULL, "s", method_can_reboot_to_firmware_setup, SD_BUS_VTABLE_UNPRIVILEGED),
2716         SD_BUS_METHOD("SetRebootToFirmwareSetup", "b", NULL, method_set_reboot_to_firmware_setup, SD_BUS_VTABLE_UNPRIVILEGED),
2717         SD_BUS_METHOD("SetWallMessage", "sb", NULL, method_set_wall_message, SD_BUS_VTABLE_UNPRIVILEGED),
2718
2719         SD_BUS_SIGNAL("SessionNew", "so", 0),
2720         SD_BUS_SIGNAL("SessionRemoved", "so", 0),
2721         SD_BUS_SIGNAL("UserNew", "uo", 0),
2722         SD_BUS_SIGNAL("UserRemoved", "uo", 0),
2723         SD_BUS_SIGNAL("SeatNew", "so", 0),
2724         SD_BUS_SIGNAL("SeatRemoved", "so", 0),
2725         SD_BUS_SIGNAL("PrepareForShutdown", "b", 0),
2726         SD_BUS_SIGNAL("PrepareForSleep", "b", 0),
2727
2728         SD_BUS_VTABLE_END
2729 };
2730
2731 static int session_jobs_reply(Session *s, const char *unit, const char *result) {
2732         assert(s);
2733         assert(unit);
2734
2735         if (!s->started)
2736                 return 0;
2737
2738         if (result && !streq(result, "done")) {
2739                 _cleanup_(sd_bus_error_free) sd_bus_error e = SD_BUS_ERROR_NULL;
2740
2741                 sd_bus_error_setf(&e, BUS_ERROR_JOB_FAILED, "Start job for unit '%s' failed with '%s'", unit, result);
2742                 return session_send_create_reply(s, &e);
2743         }
2744
2745         return session_send_create_reply(s, NULL);
2746 }
2747
2748 int match_job_removed(sd_bus_message *message, void *userdata, sd_bus_error *error) {
2749         const char *path, *result, *unit;
2750         Manager *m = userdata;
2751         Session *session;
2752         uint32_t id;
2753         User *user;
2754         int r;
2755
2756         assert(message);
2757         assert(m);
2758
2759         r = sd_bus_message_read(message, "uoss", &id, &path, &unit, &result);
2760         if (r < 0) {
2761                 bus_log_parse_error(r);
2762                 return 0;
2763         }
2764
2765         if (m->action_job && streq(m->action_job, path)) {
2766                 log_info("Operation '%s' finished.", inhibit_what_to_string(m->action_what));
2767
2768                 /* Tell people that they now may take a lock again */
2769                 (void) send_prepare_for(m, m->action_what, false);
2770
2771                 m->action_job = mfree(m->action_job);
2772                 m->action_unit = NULL;
2773                 m->action_what = 0;
2774                 return 0;
2775         }
2776
2777         session = hashmap_get(m->session_units, unit);
2778         if (session) {
2779                 if (streq_ptr(path, session->scope_job)) {
2780                         session->scope_job = mfree(session->scope_job);
2781                         (void) session_jobs_reply(session, unit, result);
2782
2783                         session_save(session);
2784                         user_save(session->user);
2785                 }
2786
2787                 session_add_to_gc_queue(session);
2788         }
2789
2790         user = hashmap_get(m->user_units, unit);
2791         if (user) {
2792                 if (streq_ptr(path, user->service_job)) {
2793                         user->service_job = mfree(user->service_job);
2794
2795                         LIST_FOREACH(sessions_by_user, session, user->sessions)
2796                                 (void) session_jobs_reply(session, unit, NULL /* don't propagate user service failures to the client */);
2797
2798                         user_save(user);
2799                 }
2800
2801                 user_add_to_gc_queue(user);
2802         }
2803
2804         return 0;
2805 }
2806
2807 int match_unit_removed(sd_bus_message *message, void *userdata, sd_bus_error *error) {
2808         const char *path, *unit;
2809         Manager *m = userdata;
2810         Session *session;
2811         User *user;
2812         int r;
2813
2814         assert(message);
2815         assert(m);
2816
2817         r = sd_bus_message_read(message, "so", &unit, &path);
2818         if (r < 0) {
2819                 bus_log_parse_error(r);
2820                 return 0;
2821         }
2822
2823         session = hashmap_get(m->session_units, unit);
2824         if (session)
2825                 session_add_to_gc_queue(session);
2826
2827         user = hashmap_get(m->user_units, unit);
2828         if (user)
2829                 user_add_to_gc_queue(user);
2830
2831         return 0;
2832 }
2833
2834 int match_properties_changed(sd_bus_message *message, void *userdata, sd_bus_error *error) {
2835         _cleanup_free_ char *unit = NULL;
2836         Manager *m = userdata;
2837         const char *path;
2838         Session *session;
2839         User *user;
2840         int r;
2841
2842         assert(message);
2843         assert(m);
2844
2845         path = sd_bus_message_get_path(message);
2846         if (!path)
2847                 return 0;
2848
2849         r = unit_name_from_dbus_path(path, &unit);
2850         if (r == -EINVAL) /* not a unit */
2851                 return 0;
2852         if (r < 0) {
2853                 log_oom();
2854                 return 0;
2855         }
2856
2857         session = hashmap_get(m->session_units, unit);
2858         if (session)
2859                 session_add_to_gc_queue(session);
2860
2861         user = hashmap_get(m->user_units, unit);
2862         if (user)
2863                 user_add_to_gc_queue(user);
2864
2865         return 0;
2866 }
2867
2868 int match_reloading(sd_bus_message *message, void *userdata, sd_bus_error *error) {
2869         Manager *m = userdata;
2870         Session *session;
2871         Iterator i;
2872         int b, r;
2873
2874         assert(message);
2875         assert(m);
2876
2877         r = sd_bus_message_read(message, "b", &b);
2878         if (r < 0) {
2879                 bus_log_parse_error(r);
2880                 return 0;
2881         }
2882
2883         if (b)
2884                 return 0;
2885
2886         /* systemd finished reloading, let's recheck all our sessions */
2887         log_debug("System manager has been reloaded, rechecking sessions...");
2888
2889         HASHMAP_FOREACH(session, m->sessions, i)
2890                 session_add_to_gc_queue(session);
2891
2892         return 0;
2893 }
2894
2895 int manager_send_changed(Manager *manager, const char *property, ...) {
2896         char **l;
2897
2898         assert(manager);
2899
2900         l = strv_from_stdarg_alloca(property);
2901
2902         return sd_bus_emit_properties_changed_strv(
2903                         manager->bus,
2904                         "/org/freedesktop/login1",
2905                         "org.freedesktop.login1.Manager",
2906                         l);
2907 }
2908
2909 static int strdup_job(sd_bus_message *reply, char **job) {
2910         const char *j;
2911         char *copy;
2912         int r;
2913
2914         r = sd_bus_message_read(reply, "o", &j);
2915         if (r < 0)
2916                 return r;
2917
2918         copy = strdup(j);
2919         if (!copy)
2920                 return -ENOMEM;
2921
2922         *job = copy;
2923         return 1;
2924 }
2925
2926 int manager_start_scope(
2927                 Manager *manager,
2928                 const char *scope,
2929                 pid_t pid,
2930                 const char *slice,
2931                 const char *description,
2932                 char **wants,
2933                 char **after,
2934                 const char *requires_mounts_for,
2935                 sd_bus_message *more_properties,
2936                 sd_bus_error *error,
2937                 char **job) {
2938
2939         _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL, *reply = NULL;
2940         char **i;
2941         int r;
2942
2943         assert(manager);
2944         assert(scope);
2945         assert(pid > 1);
2946         assert(job);
2947
2948         r = sd_bus_message_new_method_call(
2949                         manager->bus,
2950                         &m,
2951                         "org.freedesktop.systemd1",
2952                         "/org/freedesktop/systemd1",
2953                         "org.freedesktop.systemd1.Manager",
2954                         "StartTransientUnit");
2955         if (r < 0)
2956                 return r;
2957
2958         r = sd_bus_message_append(m, "ss", strempty(scope), "fail");
2959         if (r < 0)
2960                 return r;
2961
2962         r = sd_bus_message_open_container(m, 'a', "(sv)");
2963         if (r < 0)
2964                 return r;
2965
2966         if (!isempty(slice)) {
2967                 r = sd_bus_message_append(m, "(sv)", "Slice", "s", slice);
2968                 if (r < 0)
2969                         return r;
2970         }
2971
2972         if (!isempty(description)) {
2973                 r = sd_bus_message_append(m, "(sv)", "Description", "s", description);
2974                 if (r < 0)
2975                         return r;
2976         }
2977
2978         STRV_FOREACH(i, wants) {
2979                 r = sd_bus_message_append(m, "(sv)", "Wants", "as", 1, *i);
2980                 if (r < 0)
2981                         return r;
2982         }
2983
2984         STRV_FOREACH(i, after) {
2985                 r = sd_bus_message_append(m, "(sv)", "After", "as", 1, *i);
2986                 if (r < 0)
2987                         return r;
2988         }
2989
2990         if (!empty_or_root(requires_mounts_for)) {
2991                 r = sd_bus_message_append(m, "(sv)", "RequiresMountsFor", "as", 1, requires_mounts_for);
2992                 if (r < 0)
2993                         return r;
2994         }
2995
2996         /* Make sure that the session shells are terminated with SIGHUP since bash and friends tend to ignore
2997          * SIGTERM */
2998         r = sd_bus_message_append(m, "(sv)", "SendSIGHUP", "b", true);
2999         if (r < 0)
3000                 return r;
3001
3002         r = sd_bus_message_append(m, "(sv)", "PIDs", "au", 1, pid);
3003         if (r < 0)
3004                 return r;
3005
3006         /* disable TasksMax= for the session scope, rely on the slice setting for it */
3007         r = sd_bus_message_append(m, "(sv)", "TasksMax", "t", (uint64_t)-1);
3008         if (r < 0)
3009                 return bus_log_create_error(r);
3010
3011         if (more_properties) {
3012                 /* If TasksMax also appears here, it will overwrite the default value set above */
3013                 r = sd_bus_message_copy(m, more_properties, true);
3014                 if (r < 0)
3015                         return r;
3016         }
3017
3018         r = sd_bus_message_close_container(m);
3019         if (r < 0)
3020                 return r;
3021
3022         r = sd_bus_message_append(m, "a(sa(sv))", 0);
3023         if (r < 0)
3024                 return r;
3025
3026         r = sd_bus_call(manager->bus, m, 0, error, &reply);
3027         if (r < 0)
3028                 return r;
3029
3030         return strdup_job(reply, job);
3031 }
3032
3033 int manager_start_unit(Manager *manager, const char *unit, sd_bus_error *error, char **job) {
3034         _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
3035         int r;
3036
3037         assert(manager);
3038         assert(unit);
3039         assert(job);
3040
3041         r = sd_bus_call_method(
3042                         manager->bus,
3043                         "org.freedesktop.systemd1",
3044                         "/org/freedesktop/systemd1",
3045                         "org.freedesktop.systemd1.Manager",
3046                         "StartUnit",
3047                         error,
3048                         &reply,
3049                         "ss", unit, "replace");
3050         if (r < 0)
3051                 return r;
3052
3053         return strdup_job(reply, job);
3054 }
3055
3056 int manager_stop_unit(Manager *manager, const char *unit, sd_bus_error *error, char **job) {
3057         _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
3058         int r;
3059
3060         assert(manager);
3061         assert(unit);
3062         assert(job);
3063
3064         r = sd_bus_call_method(
3065                         manager->bus,
3066                         "org.freedesktop.systemd1",
3067                         "/org/freedesktop/systemd1",
3068                         "org.freedesktop.systemd1.Manager",
3069                         "StopUnit",
3070                         error,
3071                         &reply,
3072                         "ss", unit, "fail");
3073         if (r < 0) {
3074                 if (sd_bus_error_has_name(error, BUS_ERROR_NO_SUCH_UNIT) ||
3075                     sd_bus_error_has_name(error, BUS_ERROR_LOAD_FAILED)) {
3076
3077                         *job = NULL;
3078                         sd_bus_error_free(error);
3079                         return 0;
3080                 }
3081
3082                 return r;
3083         }
3084
3085         return strdup_job(reply, job);
3086 }
3087
3088 int manager_abandon_scope(Manager *manager, const char *scope, sd_bus_error *ret_error) {
3089         _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
3090         _cleanup_free_ char *path = NULL;
3091         int r;
3092
3093         assert(manager);
3094         assert(scope);
3095
3096         path = unit_dbus_path_from_name(scope);
3097         if (!path)
3098                 return -ENOMEM;
3099
3100         r = sd_bus_call_method(
3101                         manager->bus,
3102                         "org.freedesktop.systemd1",
3103                         path,
3104                         "org.freedesktop.systemd1.Scope",
3105                         "Abandon",
3106                         &error,
3107                         NULL,
3108                         NULL);
3109         if (r < 0) {
3110                 if (sd_bus_error_has_name(&error, BUS_ERROR_NO_SUCH_UNIT) ||
3111                     sd_bus_error_has_name(&error, BUS_ERROR_LOAD_FAILED) ||
3112                     sd_bus_error_has_name(&error, BUS_ERROR_SCOPE_NOT_RUNNING))
3113                         return 0;
3114
3115                 sd_bus_error_move(ret_error, &error);
3116                 return r;
3117         }
3118
3119         return 1;
3120 }
3121
3122 int manager_kill_unit(Manager *manager, const char *unit, KillWho who, int signo, sd_bus_error *error) {
3123         assert(manager);
3124         assert(unit);
3125
3126         return sd_bus_call_method(
3127                         manager->bus,
3128                         "org.freedesktop.systemd1",
3129                         "/org/freedesktop/systemd1",
3130                         "org.freedesktop.systemd1.Manager",
3131                         "KillUnit",
3132                         error,
3133                         NULL,
3134                         "ssi", unit, who == KILL_LEADER ? "main" : "all", signo);
3135 }
3136
3137 int manager_unit_is_active(Manager *manager, const char *unit, sd_bus_error *ret_error) {
3138         _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
3139         _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
3140         _cleanup_free_ char *path = NULL;
3141         const char *state;
3142         int r;
3143
3144         assert(manager);
3145         assert(unit);
3146
3147         path = unit_dbus_path_from_name(unit);
3148         if (!path)
3149                 return -ENOMEM;
3150
3151         r = sd_bus_get_property(
3152                         manager->bus,
3153                         "org.freedesktop.systemd1",
3154                         path,
3155                         "org.freedesktop.systemd1.Unit",
3156                         "ActiveState",
3157                         &error,
3158                         &reply,
3159                         "s");
3160         if (r < 0) {
3161                 /* systemd might have droppped off momentarily, let's
3162                  * not make this an error */
3163                 if (sd_bus_error_has_name(&error, SD_BUS_ERROR_NO_REPLY) ||
3164                     sd_bus_error_has_name(&error, SD_BUS_ERROR_DISCONNECTED))
3165                         return true;
3166
3167                 /* If the unit is already unloaded then it's not
3168                  * active */
3169                 if (sd_bus_error_has_name(&error, BUS_ERROR_NO_SUCH_UNIT) ||
3170                     sd_bus_error_has_name(&error, BUS_ERROR_LOAD_FAILED))
3171                         return false;
3172
3173                 sd_bus_error_move(ret_error, &error);
3174                 return r;
3175         }
3176
3177         r = sd_bus_message_read(reply, "s", &state);
3178         if (r < 0)
3179                 return r;
3180
3181         return !STR_IN_SET(state, "inactive", "failed");
3182 }
3183
3184 int manager_job_is_active(Manager *manager, const char *path, sd_bus_error *ret_error) {
3185         _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
3186         _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
3187         int r;
3188
3189         assert(manager);
3190         assert(path);
3191
3192         r = sd_bus_get_property(
3193                         manager->bus,
3194                         "org.freedesktop.systemd1",
3195                         path,
3196                         "org.freedesktop.systemd1.Job",
3197                         "State",
3198                         &error,
3199                         &reply,
3200                         "s");
3201         if (r < 0) {
3202                 if (sd_bus_error_has_name(&error, SD_BUS_ERROR_NO_REPLY) ||
3203                     sd_bus_error_has_name(&error, SD_BUS_ERROR_DISCONNECTED))
3204                         return true;
3205
3206                 if (sd_bus_error_has_name(&error, SD_BUS_ERROR_UNKNOWN_OBJECT))
3207                         return false;
3208
3209                 sd_bus_error_move(ret_error, &error);
3210                 return r;
3211         }
3212
3213         /* We don't actually care about the state really. The fact
3214          * that we could read the job state is enough for us */
3215
3216         return true;
3217 }