src/logind-dbus.c

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