src/login/logind-session-dbus.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /***
   3   This file is part of systemd.
   4
   5   Copyright 2011 Lennart Poettering
   6 ***/
   7
   8 #include <errno.h>
   9 #include <string.h>
  10
  11 #include "alloc-util.h"
  12 #include "bus-common-errors.h"
  13 #include "bus-label.h"
  14 #include "bus-util.h"
  15 #include "fd-util.h"
  16 #include "logind-session-device.h"
  17 #include "logind-session.h"
  18 #include "logind.h"
  19 #include "signal-util.h"
  20 #include "strv.h"
  21 #include "util.h"
  22
  23 static int property_get_user(
  24                 sd_bus *bus,
  25                 const char *path,
  26                 const char *interface,
  27                 const char *property,
  28                 sd_bus_message *reply,
  29                 void *userdata,
  30                 sd_bus_error *error) {
  31
  32         _cleanup_free_ char *p = NULL;
  33         Session *s = userdata;
  34
  35         assert(bus);
  36         assert(reply);
  37         assert(s);
  38
  39         p = user_bus_path(s->user);
  40         if (!p)
  41                 return -ENOMEM;
  42
  43         return sd_bus_message_append(reply, "(uo)", (uint32_t) s->user->uid, p);
  44 }
  45
  46 static int property_get_name(
  47                 sd_bus *bus,
  48                 const char *path,
  49                 const char *interface,
  50                 const char *property,
  51                 sd_bus_message *reply,
  52                 void *userdata,
  53                 sd_bus_error *error) {
  54
  55         Session *s = userdata;
  56
  57         assert(bus);
  58         assert(reply);
  59         assert(s);
  60
  61         return sd_bus_message_append(reply, "s", s->user->name);
  62 }
  63
  64 static int property_get_seat(
  65                 sd_bus *bus,
  66                 const char *path,
  67                 const char *interface,
  68                 const char *property,
  69                 sd_bus_message *reply,
  70                 void *userdata,
  71                 sd_bus_error *error) {
  72
  73         _cleanup_free_ char *p = NULL;
  74         Session *s = userdata;
  75
  76         assert(bus);
  77         assert(reply);
  78         assert(s);
  79
  80         p = s->seat ? seat_bus_path(s->seat) : strdup("/");
  81         if (!p)
  82                 return -ENOMEM;
  83
  84         return sd_bus_message_append(reply, "(so)", s->seat ? s->seat->id : "", p);
  85 }
  86
  87 static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_type, session_type, SessionType);
  88 static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_class, session_class, SessionClass);
  89
  90 static int property_get_active(
  91                 sd_bus *bus,
  92                 const char *path,
  93                 const char *interface,
  94                 const char *property,
  95                 sd_bus_message *reply,
  96                 void *userdata,
  97                 sd_bus_error *error) {
  98
  99         Session *s = userdata;
 100
 101         assert(bus);
 102         assert(reply);
 103         assert(s);
 104
 105         return sd_bus_message_append(reply, "b", session_is_active(s));
 106 }
 107
 108 static int property_get_state(
 109                 sd_bus *bus,
 110                 const char *path,
 111                 const char *interface,
 112                 const char *property,
 113                 sd_bus_message *reply,
 114                 void *userdata,
 115                 sd_bus_error *error) {
 116
 117         Session *s = userdata;
 118
 119         assert(bus);
 120         assert(reply);
 121         assert(s);
 122
 123         return sd_bus_message_append(reply, "s", session_state_to_string(session_get_state(s)));
 124 }
 125
 126 static int property_get_idle_hint(
 127                 sd_bus *bus,
 128                 const char *path,
 129                 const char *interface,
 130                 const char *property,
 131                 sd_bus_message *reply,
 132                 void *userdata,
 133                 sd_bus_error *error) {
 134
 135         Session *s = userdata;
 136
 137         assert(bus);
 138         assert(reply);
 139         assert(s);
 140
 141         return sd_bus_message_append(reply, "b", session_get_idle_hint(s, NULL) > 0);
 142 }
 143
 144 static int property_get_idle_since_hint(
 145                 sd_bus *bus,
 146                 const char *path,
 147                 const char *interface,
 148                 const char *property,
 149                 sd_bus_message *reply,
 150                 void *userdata,
 151                 sd_bus_error *error) {
 152
 153         Session *s = userdata;
 154         dual_timestamp t = DUAL_TIMESTAMP_NULL;
 155         uint64_t u;
 156         int r;
 157
 158         assert(bus);
 159         assert(reply);
 160         assert(s);
 161
 162         r = session_get_idle_hint(s, &t);
 163         if (r < 0)
 164                 return r;
 165
 166         u = streq(property, "IdleSinceHint") ? t.realtime : t.monotonic;
 167
 168         return sd_bus_message_append(reply, "t", u);
 169 }
 170
 171 static int property_get_locked_hint(
 172                 sd_bus *bus,
 173                 const char *path,
 174                 const char *interface,
 175                 const char *property,
 176                 sd_bus_message *reply,
 177                 void *userdata,
 178                 sd_bus_error *error) {
 179
 180         Session *s = userdata;
 181
 182         assert(bus);
 183         assert(reply);
 184         assert(s);
 185
 186         return sd_bus_message_append(reply, "b", session_get_locked_hint(s) > 0);
 187 }
 188
 189 int bus_session_method_terminate(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 190         Session *s = userdata;
 191         int r;
 192
 193         assert(message);
 194         assert(s);
 195
 196         r = bus_verify_polkit_async(
 197                         message,
 198                         CAP_KILL,
 199                         "org.freedesktop.login1.manage",
 200                         NULL,
 201                         false,
 202                         s->user->uid,
 203                         &s->manager->polkit_registry,
 204                         error);
 205         if (r < 0)
 206                 return r;
 207         if (r == 0)
 208                 return 1; /* Will call us back */
 209
 210         r = session_stop(s, true);
 211         if (r < 0)
 212                 return r;
 213
 214         return sd_bus_reply_method_return(message, NULL);
 215 }
 216
 217 int bus_session_method_activate(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 218         Session *s = userdata;
 219         int r;
 220
 221         assert(message);
 222         assert(s);
 223
 224         r = session_activate(s);
 225         if (r < 0)
 226                 return r;
 227
 228         return sd_bus_reply_method_return(message, NULL);
 229 }
 230
 231 int bus_session_method_lock(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 232         Session *s = userdata;
 233         int r;
 234
 235         assert(message);
 236         assert(s);
 237
 238         r = bus_verify_polkit_async(
 239                         message,
 240                         CAP_SYS_ADMIN,
 241                         "org.freedesktop.login1.lock-sessions",
 242                         NULL,
 243                         false,
 244                         s->user->uid,
 245                         &s->manager->polkit_registry,
 246                         error);
 247         if (r < 0)
 248                 return r;
 249         if (r == 0)
 250                 return 1; /* Will call us back */
 251
 252         r = session_send_lock(s, strstr(sd_bus_message_get_member(message), "Lock"));
 253         if (r < 0)
 254                 return r;
 255
 256         return sd_bus_reply_method_return(message, NULL);
 257 }
 258
 259 static int method_set_idle_hint(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 260         _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
 261         Session *s = userdata;
 262         uid_t uid;
 263         int r, b;
 264
 265         assert(message);
 266         assert(s);
 267
 268         r = sd_bus_message_read(message, "b", &b);
 269         if (r < 0)
 270                 return r;
 271
 272         r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_EUID, &creds);
 273         if (r < 0)
 274                 return r;
 275
 276         r = sd_bus_creds_get_euid(creds, &uid);
 277         if (r < 0)
 278                 return r;
 279
 280         if (uid != 0 && uid != s->user->uid)
 281                 return sd_bus_error_setf(error, SD_BUS_ERROR_ACCESS_DENIED, "Only owner of session may set idle hint");
 282
 283         session_set_idle_hint(s, b);
 284
 285         return sd_bus_reply_method_return(message, NULL);
 286 }
 287
 288 static int method_set_locked_hint(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 289         _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
 290         Session *s = userdata;
 291         uid_t uid;
 292         int r, b;
 293
 294         assert(message);
 295         assert(s);
 296
 297         r = sd_bus_message_read(message, "b", &b);
 298         if (r < 0)
 299                 return r;
 300
 301         r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_EUID, &creds);
 302         if (r < 0)
 303                 return r;
 304
 305         r = sd_bus_creds_get_euid(creds, &uid);
 306         if (r < 0)
 307                 return r;
 308
 309         if (uid != 0 && uid != s->user->uid)
 310                 return sd_bus_error_setf(error, SD_BUS_ERROR_ACCESS_DENIED, "Only owner of session may set locked hint");
 311
 312         session_set_locked_hint(s, b);
 313
 314         return sd_bus_reply_method_return(message, NULL);
 315 }
 316
 317 int bus_session_method_kill(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 318         Session *s = userdata;
 319         const char *swho;
 320         int32_t signo;
 321         KillWho who;
 322         int r;
 323
 324         assert(message);
 325         assert(s);
 326
 327         r = sd_bus_message_read(message, "si", &swho, &signo);
 328         if (r < 0)
 329                 return r;
 330
 331         if (isempty(swho))
 332                 who = KILL_ALL;
 333         else {
 334                 who = kill_who_from_string(swho);
 335                 if (who < 0)
 336                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid kill parameter '%s'", swho);
 337         }
 338
 339         if (!SIGNAL_VALID(signo))
 340                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid signal %i", signo);
 341
 342         r = bus_verify_polkit_async(
 343                         message,
 344                         CAP_KILL,
 345                         "org.freedesktop.login1.manage",
 346                         NULL,
 347                         false,
 348                         s->user->uid,
 349                         &s->manager->polkit_registry,
 350                         error);
 351         if (r < 0)
 352                 return r;
 353         if (r == 0)
 354                 return 1; /* Will call us back */
 355
 356         r = session_kill(s, who, signo);
 357         if (r < 0)
 358                 return r;
 359
 360         return sd_bus_reply_method_return(message, NULL);
 361 }
 362
 363 static int method_take_control(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 364         _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
 365         Session *s = userdata;
 366         int r, force;
 367         uid_t uid;
 368
 369         assert(message);
 370         assert(s);
 371
 372         r = sd_bus_message_read(message, "b", &force);
 373         if (r < 0)
 374                 return r;
 375
 376         r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_EUID, &creds);
 377         if (r < 0)
 378                 return r;
 379
 380         r = sd_bus_creds_get_euid(creds, &uid);
 381         if (r < 0)
 382                 return r;
 383
 384         if (uid != 0 && (force || uid != s->user->uid))
 385                 return sd_bus_error_setf(error, SD_BUS_ERROR_ACCESS_DENIED, "Only owner of session may take control");
 386
 387         r = session_set_controller(s, sd_bus_message_get_sender(message), force, true);
 388         if (r < 0)
 389                 return r;
 390
 391         return sd_bus_reply_method_return(message, NULL);
 392 }
 393
 394 static int method_release_control(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 395         Session *s = userdata;
 396
 397         assert(message);
 398         assert(s);
 399
 400         if (!session_is_controller(s, sd_bus_message_get_sender(message)))
 401                 return sd_bus_error_setf(error, BUS_ERROR_NOT_IN_CONTROL, "You are not in control of this session");
 402
 403         session_drop_controller(s);
 404
 405         return sd_bus_reply_method_return(message, NULL);
 406 }
 407
 408 static int method_take_device(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 409         Session *s = userdata;
 410         uint32_t major, minor;
 411         SessionDevice *sd;
 412         dev_t dev;
 413         int r;
 414
 415         assert(message);
 416         assert(s);
 417
 418         r = sd_bus_message_read(message, "uu", &major, &minor);
 419         if (r < 0)
 420                 return r;
 421
 422         if (!session_is_controller(s, sd_bus_message_get_sender(message)))
 423                 return sd_bus_error_setf(error, BUS_ERROR_NOT_IN_CONTROL, "You are not in control of this session");
 424
 425         dev = makedev(major, minor);
 426         sd = hashmap_get(s->devices, &dev);
 427         if (sd)
 428                 /* We don't allow retrieving a device multiple times.
 429                  * The related ReleaseDevice call is not ref-counted.
 430                  * The caller should use dup() if it requires more
 431                  * than one fd (it would be functionally
 432                  * equivalent). */
 433                 return sd_bus_error_setf(error, BUS_ERROR_DEVICE_IS_TAKEN, "Device already taken");
 434
 435         r = session_device_new(s, dev, true, &sd);
 436         if (r < 0)
 437                 return r;
 438
 439         r = session_device_save(sd);
 440         if (r < 0)
 441                 goto error;
 442
 443         r = sd_bus_reply_method_return(message, "hb", sd->fd, !sd->active);
 444         if (r < 0)
 445                 goto error;
 446
 447         session_save(s);
 448         return 1;
 449
 450 error:
 451         session_device_free(sd);
 452         return r;
 453 }
 454
 455 static int method_release_device(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 456         Session *s = userdata;
 457         uint32_t major, minor;
 458         SessionDevice *sd;
 459         dev_t dev;
 460         int r;
 461
 462         assert(message);
 463         assert(s);
 464
 465         r = sd_bus_message_read(message, "uu", &major, &minor);
 466         if (r < 0)
 467                 return r;
 468
 469         if (!session_is_controller(s, sd_bus_message_get_sender(message)))
 470                 return sd_bus_error_setf(error, BUS_ERROR_NOT_IN_CONTROL, "You are not in control of this session");
 471
 472         dev = makedev(major, minor);
 473         sd = hashmap_get(s->devices, &dev);
 474         if (!sd)
 475                 return sd_bus_error_setf(error, BUS_ERROR_DEVICE_NOT_TAKEN, "Device not taken");
 476
 477         session_device_free(sd);
 478         session_save(s);
 479
 480         return sd_bus_reply_method_return(message, NULL);
 481 }
 482
 483 static int method_pause_device_complete(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 484         Session *s = userdata;
 485         uint32_t major, minor;
 486         SessionDevice *sd;
 487         dev_t dev;
 488         int r;
 489
 490         assert(message);
 491         assert(s);
 492
 493         r = sd_bus_message_read(message, "uu", &major, &minor);
 494         if (r < 0)
 495                 return r;
 496
 497         if (!session_is_controller(s, sd_bus_message_get_sender(message)))
 498                 return sd_bus_error_setf(error, BUS_ERROR_NOT_IN_CONTROL, "You are not in control of this session");
 499
 500         dev = makedev(major, minor);
 501         sd = hashmap_get(s->devices, &dev);
 502         if (!sd)
 503                 return sd_bus_error_setf(error, BUS_ERROR_DEVICE_NOT_TAKEN, "Device not taken");
 504
 505         session_device_complete_pause(sd);
 506
 507         return sd_bus_reply_method_return(message, NULL);
 508 }
 509
 510 const sd_bus_vtable session_vtable[] = {
 511         SD_BUS_VTABLE_START(0),
 512
 513         SD_BUS_PROPERTY("Id", "s", NULL, offsetof(Session, id), SD_BUS_VTABLE_PROPERTY_CONST),
 514         SD_BUS_PROPERTY("User", "(uo)", property_get_user, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 515         SD_BUS_PROPERTY("Name", "s", property_get_name, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 516         BUS_PROPERTY_DUAL_TIMESTAMP("Timestamp", offsetof(Session, timestamp), SD_BUS_VTABLE_PROPERTY_CONST),
 517         SD_BUS_PROPERTY("VTNr", "u", NULL, offsetof(Session, vtnr), SD_BUS_VTABLE_PROPERTY_CONST),
 518         SD_BUS_PROPERTY("Seat", "(so)", property_get_seat, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 519         SD_BUS_PROPERTY("TTY", "s", NULL, offsetof(Session, tty), SD_BUS_VTABLE_PROPERTY_CONST),
 520         SD_BUS_PROPERTY("Display", "s", NULL, offsetof(Session, display), SD_BUS_VTABLE_PROPERTY_CONST),
 521         SD_BUS_PROPERTY("Remote", "b", bus_property_get_bool, offsetof(Session, remote), SD_BUS_VTABLE_PROPERTY_CONST),
 522         SD_BUS_PROPERTY("RemoteHost", "s", NULL, offsetof(Session, remote_host), SD_BUS_VTABLE_PROPERTY_CONST),
 523         SD_BUS_PROPERTY("RemoteUser", "s", NULL, offsetof(Session, remote_user), SD_BUS_VTABLE_PROPERTY_CONST),
 524         SD_BUS_PROPERTY("Service", "s", NULL, offsetof(Session, service), SD_BUS_VTABLE_PROPERTY_CONST),
 525         SD_BUS_PROPERTY("Desktop", "s", NULL, offsetof(Session, desktop), SD_BUS_VTABLE_PROPERTY_CONST),
 526         SD_BUS_PROPERTY("Scope", "s", NULL, offsetof(Session, scope), SD_BUS_VTABLE_PROPERTY_CONST),
 527         SD_BUS_PROPERTY("Leader", "u", bus_property_get_pid, offsetof(Session, leader), SD_BUS_VTABLE_PROPERTY_CONST),
 528         SD_BUS_PROPERTY("Audit", "u", NULL, offsetof(Session, audit_id), SD_BUS_VTABLE_PROPERTY_CONST),
 529         SD_BUS_PROPERTY("Type", "s", property_get_type, offsetof(Session, type), SD_BUS_VTABLE_PROPERTY_CONST),
 530         SD_BUS_PROPERTY("Class", "s", property_get_class, offsetof(Session, class), SD_BUS_VTABLE_PROPERTY_CONST),
 531         SD_BUS_PROPERTY("Active", "b", property_get_active, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 532         SD_BUS_PROPERTY("State", "s", property_get_state, 0, 0),
 533         SD_BUS_PROPERTY("IdleHint", "b", property_get_idle_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 534         SD_BUS_PROPERTY("IdleSinceHint", "t", property_get_idle_since_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 535         SD_BUS_PROPERTY("IdleSinceHintMonotonic", "t", property_get_idle_since_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 536         SD_BUS_PROPERTY("LockedHint", "b", property_get_locked_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 537
 538         SD_BUS_METHOD("Terminate", NULL, NULL, bus_session_method_terminate, SD_BUS_VTABLE_UNPRIVILEGED),
 539         SD_BUS_METHOD("Activate", NULL, NULL, bus_session_method_activate, SD_BUS_VTABLE_UNPRIVILEGED),
 540         SD_BUS_METHOD("Lock", NULL, NULL, bus_session_method_lock, SD_BUS_VTABLE_UNPRIVILEGED),
 541         SD_BUS_METHOD("Unlock", NULL, NULL, bus_session_method_lock, SD_BUS_VTABLE_UNPRIVILEGED),
 542         SD_BUS_METHOD("SetIdleHint", "b", NULL, method_set_idle_hint, SD_BUS_VTABLE_UNPRIVILEGED),
 543         SD_BUS_METHOD("SetLockedHint", "b", NULL, method_set_locked_hint, SD_BUS_VTABLE_UNPRIVILEGED),
 544         SD_BUS_METHOD("Kill", "si", NULL, bus_session_method_kill, SD_BUS_VTABLE_UNPRIVILEGED),
 545         SD_BUS_METHOD("TakeControl", "b", NULL, method_take_control, SD_BUS_VTABLE_UNPRIVILEGED),
 546         SD_BUS_METHOD("ReleaseControl", NULL, NULL, method_release_control, SD_BUS_VTABLE_UNPRIVILEGED),
 547         SD_BUS_METHOD("TakeDevice", "uu", "hb", method_take_device, SD_BUS_VTABLE_UNPRIVILEGED),
 548         SD_BUS_METHOD("ReleaseDevice", "uu", NULL, method_release_device, SD_BUS_VTABLE_UNPRIVILEGED),
 549         SD_BUS_METHOD("PauseDeviceComplete", "uu", NULL, method_pause_device_complete, SD_BUS_VTABLE_UNPRIVILEGED),
 550
 551         SD_BUS_SIGNAL("PauseDevice", "uus", 0),
 552         SD_BUS_SIGNAL("ResumeDevice", "uuh", 0),
 553         SD_BUS_SIGNAL("Lock", NULL, 0),
 554         SD_BUS_SIGNAL("Unlock", NULL, 0),
 555
 556         SD_BUS_VTABLE_END
 557 };
 558
 559 int session_object_find(sd_bus *bus, const char *path, const char *interface, void *userdata, void **found, sd_bus_error *error) {
 560         Manager *m = userdata;
 561         Session *session;
 562         int r;
 563
 564         assert(bus);
 565         assert(path);
 566         assert(interface);
 567         assert(found);
 568         assert(m);
 569
 570         if (streq(path, "/org/freedesktop/login1/session/self")) {
 571                 sd_bus_message *message;
 572
 573                 message = sd_bus_get_current_message(bus);
 574                 if (!message)
 575                         return 0;
 576
 577                 r = manager_get_session_from_creds(m, message, NULL, error, &session);
 578                 if (r < 0)
 579                         return r;
 580         } else {
 581                 _cleanup_free_ char *e = NULL;
 582                 const char *p;
 583
 584                 p = startswith(path, "/org/freedesktop/login1/session/");
 585                 if (!p)
 586                         return 0;
 587
 588                 e = bus_label_unescape(p);
 589                 if (!e)
 590                         return -ENOMEM;
 591
 592                 session = hashmap_get(m->sessions, e);
 593                 if (!session)
 594                         return 0;
 595         }
 596
 597         *found = session;
 598         return 1;
 599 }
 600
 601 char *session_bus_path(Session *s) {
 602         _cleanup_free_ char *t = NULL;
 603
 604         assert(s);
 605
 606         t = bus_label_escape(s->id);
 607         if (!t)
 608                 return NULL;
 609
 610         return strappend("/org/freedesktop/login1/session/", t);
 611 }
 612
 613 int session_node_enumerator(sd_bus *bus, const char *path, void *userdata, char ***nodes, sd_bus_error *error) {
 614         _cleanup_strv_free_ char **l = NULL;
 615         sd_bus_message *message;
 616         Manager *m = userdata;
 617         Session *session;
 618         Iterator i;
 619         int r;
 620
 621         assert(bus);
 622         assert(path);
 623         assert(nodes);
 624
 625         HASHMAP_FOREACH(session, m->sessions, i) {
 626                 char *p;
 627
 628                 p = session_bus_path(session);
 629                 if (!p)
 630                         return -ENOMEM;
 631
 632                 r = strv_consume(&l, p);
 633                 if (r < 0)
 634                         return r;
 635         }
 636
 637         message = sd_bus_get_current_message(bus);
 638         if (message) {
 639                 _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
 640                 const char *name;
 641
 642                 r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_SESSION|SD_BUS_CREDS_AUGMENT, &creds);
 643                 if (r >= 0) {
 644                         r = sd_bus_creds_get_session(creds, &name);
 645                         if (r >= 0) {
 646                                 session = hashmap_get(m->sessions, name);
 647                                 if (session) {
 648                                         r = strv_extend(&l, "/org/freedesktop/login1/session/self");
 649                                         if (r < 0)
 650                                                 return r;
 651                                 }
 652                         }
 653                 }
 654         }
 655
 656         *nodes = TAKE_PTR(l);
 657
 658         return 1;
 659 }
 660
 661 int session_send_signal(Session *s, bool new_session) {
 662         _cleanup_free_ char *p = NULL;
 663
 664         assert(s);
 665
 666         p = session_bus_path(s);
 667         if (!p)
 668                 return -ENOMEM;
 669
 670         return sd_bus_emit_signal(
 671                         s->manager->bus,
 672                         "/org/freedesktop/login1",
 673                         "org.freedesktop.login1.Manager",
 674                         new_session ? "SessionNew" : "SessionRemoved",
 675                         "so", s->id, p);
 676 }
 677
 678 int session_send_changed(Session *s, const char *properties, ...) {
 679         _cleanup_free_ char *p = NULL;
 680         char **l;
 681
 682         assert(s);
 683
 684         if (!s->started)
 685                 return 0;
 686
 687         p = session_bus_path(s);
 688         if (!p)
 689                 return -ENOMEM;
 690
 691         l = strv_from_stdarg_alloca(properties);
 692
 693         return sd_bus_emit_properties_changed_strv(s->manager->bus, p, "org.freedesktop.login1.Session", l);
 694 }
 695
 696 int session_send_lock(Session *s, bool lock) {
 697         _cleanup_free_ char *p = NULL;
 698
 699         assert(s);
 700
 701         p = session_bus_path(s);
 702         if (!p)
 703                 return -ENOMEM;
 704
 705         return sd_bus_emit_signal(
 706                         s->manager->bus,
 707                         p,
 708                         "org.freedesktop.login1.Session",
 709                         lock ? "Lock" : "Unlock",
 710                         NULL);
 711 }
 712
 713 int session_send_lock_all(Manager *m, bool lock) {
 714         Session *session;
 715         Iterator i;
 716         int r = 0;
 717
 718         assert(m);
 719
 720         HASHMAP_FOREACH(session, m->sessions, i) {
 721                 int k;
 722
 723                 k = session_send_lock(session, lock);
 724                 if (k < 0)
 725                         r = k;
 726         }
 727
 728         return r;
 729 }
 730
 731 int session_send_create_reply(Session *s, sd_bus_error *error) {
 732         _cleanup_(sd_bus_message_unrefp) sd_bus_message *c = NULL;
 733         _cleanup_close_ int fifo_fd = -1;
 734         _cleanup_free_ char *p = NULL;
 735
 736         assert(s);
 737
 738         /* This is called after the session scope and the user service
 739          * were successfully created, and finishes where
 740          * bus_manager_create_session() left off. */
 741
 742         if (!s->create_message)
 743                 return 0;
 744
 745 #if 0 /// elogind does not support scope and service jobs
 746         if (!sd_bus_error_is_set(error) && (s->scope_job || s->user->service_job))
 747                 return 0;
 748 #endif // 0
 749
 750         c = s->create_message;
 751         s->create_message = NULL;
 752
 753         if (error)
 754                 return sd_bus_reply_method_error(c, error);
 755
 756         fifo_fd = session_create_fifo(s);
 757         if (fifo_fd < 0)
 758                 return fifo_fd;
 759
 760         /* Update the session state file before we notify the client
 761          * about the result. */
 762         session_save(s);
 763
 764 #if 1 /// Additionally elogind saves the user state file
 765         user_save(s->user);
 766 #endif // 1
 767         p = session_bus_path(s);
 768         if (!p)
 769                 return -ENOMEM;
 770
 771         log_debug("Sending reply about created session: "
 772                   "id=%s object_path=%s uid=%u runtime_path=%s "
 773                   "session_fd=%d seat=%s vtnr=%u",
 774                   s->id,
 775                   p,
 776                   (uint32_t) s->user->uid,
 777                   s->user->runtime_path,
 778                   fifo_fd,
 779                   s->seat ? s->seat->id : "",
 780                   (uint32_t) s->vtnr);
 781
 782         return sd_bus_reply_method_return(
 783                         c, "soshusub",
 784                         s->id,
 785                         p,
 786                         s->user->runtime_path,
 787                         fifo_fd,
 788                         (uint32_t) s->user->uid,
 789                         s->seat ? s->seat->id : "",
 790                         (uint32_t) s->vtnr,
 791                         false);
 792 }