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 (!dbus_message_iter_next(&iter) ||
 320             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_ARRAY ||
 321             dbus_message_iter_get_element_type(&iter) != DBUS_TYPE_STRING) {
 322                 r = -EINVAL;
 323                 goto fail;
 324         }
 325
 326         r = bus_parse_strv_iter(&iter, &reset_controllers);
 327         if (r < 0)
 328                 goto fail;
 329
 330         if (!dbus_message_iter_next(&iter) ||
 331             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_BOOLEAN) {
 332                 r = -EINVAL;
 333                 goto fail;
 334         }
 335
 336         dbus_message_iter_get_basic(&iter, &kill_processes);
 337
 338         r = manager_add_user_by_uid(m, uid, &user);
 339         if (r < 0)
 340                 goto fail;
 341
 342         audit_session_from_pid(leader, &audit_id);
 343
 344         if (audit_id > 0) {
 345                 asprintf(&id, "%lu", (unsigned long) audit_id);
 346
 347                 if (!id) {
 348                         r = -ENOMEM;
 349                         goto fail;
 350                 }
 351
 352                 session = hashmap_get(m->sessions, id);
 353
 354                 if (session) {
 355
 356                         fifo_fd = session_create_fifo(session);
 357                         if (fifo_fd < 0) {
 358                                 r = fifo_fd;
 359                                 goto fail;
 360                         }
 361
 362                         /* Session already exists, client is probably
 363                          * something like "su" which changes uid but
 364                          * is still the same audit session */
 365
 366                         reply = dbus_message_new_method_return(message);
 367                         if (!reply) {
 368                                 r = -ENOMEM;
 369                                 goto fail;
 370                         }
 371
 372                         p = session_bus_path(session);
 373                         if (!p) {
 374                                 r = -ENOMEM;
 375                                 goto fail;
 376                         }
 377
 378                         b = dbus_message_append_args(
 379                                         reply,
 380                                         DBUS_TYPE_STRING, &session->id,
 381                                         DBUS_TYPE_OBJECT_PATH, &p,
 382                                         DBUS_TYPE_STRING, &session->user->runtime_path,
 383                                         DBUS_TYPE_UNIX_FD, &fifo_fd,
 384                                         DBUS_TYPE_INVALID);
 385                         free(p);
 386
 387                         if (!b) {
 388                                 r = -ENOMEM;
 389                                 goto fail;
 390                         }
 391
 392                         close_nointr_nofail(fifo_fd);
 393                         *_reply = reply;
 394
 395                         return 0;
 396                 }
 397
 398         } else {
 399                 do {
 400                         free(id);
 401                         asprintf(&id, "c%lu", ++m->session_counter);
 402
 403                         if (!id) {
 404                                 r = -ENOMEM;
 405                                 goto fail;
 406                         }
 407
 408                 } while (hashmap_get(m->sessions, id));
 409         }
 410
 411         r = manager_add_session(m, user, id, &session);
 412         free(id);
 413         if (r < 0)
 414                 goto fail;
 415
 416         session->leader = leader;
 417         session->audit_id = audit_id;
 418         session->type = t;
 419         session->remote = remote;
 420         session->controllers = controllers;
 421         session->reset_controllers = reset_controllers;
 422         session->kill_processes = kill_processes;
 423         session->vtnr = vtnr;
 424
 425         controllers = reset_controllers = NULL;
 426
 427         if (!isempty(tty)) {
 428                 session->tty = strdup(tty);
 429                 if (!session->tty) {
 430                         r = -ENOMEM;
 431                         goto fail;
 432                 }
 433         }
 434
 435         if (!isempty(display)) {
 436                 session->display = strdup(display);
 437                 if (!session->display) {
 438                         r = -ENOMEM;
 439                         goto fail;
 440                 }
 441         }
 442
 443         if (!isempty(remote_user)) {
 444                 session->remote_user = strdup(remote_user);
 445                 if (!session->remote_user) {
 446                         r = -ENOMEM;
 447                         goto fail;
 448                 }
 449         }
 450
 451         if (!isempty(remote_host)) {
 452                 session->remote_host = strdup(remote_host);
 453                 if (!session->remote_host) {
 454                         r = -ENOMEM;
 455                         goto fail;
 456                 }
 457         }
 458
 459         if (!isempty(service)) {
 460                 session->service = strdup(service);
 461                 if (!session->service) {
 462                         r = -ENOMEM;
 463                         goto fail;
 464                 }
 465         }
 466
 467         fifo_fd = session_create_fifo(session);
 468         if (fifo_fd < 0) {
 469                 r = fifo_fd;
 470                 goto fail;
 471         }
 472
 473         if (s) {
 474                 r = seat_attach_session(s, session);
 475                 if (r < 0)
 476                         goto fail;
 477         }
 478
 479         r = session_start(session);
 480         if (r < 0)
 481                 goto fail;
 482
 483         reply = dbus_message_new_method_return(message);
 484         if (!reply) {
 485                 r = -ENOMEM;
 486                 goto fail;
 487         }
 488
 489         p = session_bus_path(session);
 490         if (!p) {
 491                 r = -ENOMEM;
 492                 goto fail;
 493         }
 494
 495         b = dbus_message_append_args(
 496                         reply,
 497                         DBUS_TYPE_STRING, &session->id,
 498                         DBUS_TYPE_OBJECT_PATH, &p,
 499                         DBUS_TYPE_STRING, &session->user->runtime_path,
 500                         DBUS_TYPE_UNIX_FD, &fifo_fd,
 501                         DBUS_TYPE_INVALID);
 502         free(p);
 503
 504         if (!b) {
 505                 r = -ENOMEM;
 506                 goto fail;
 507         }
 508
 509         close_nointr_nofail(fifo_fd);
 510         *_reply = reply;
 511
 512         return 0;
 513
 514 fail:
 515         strv_free(controllers);
 516         strv_free(reset_controllers);
 517
 518         if (session)
 519                 session_add_to_gc_queue(session);
 520
 521         if (user)
 522                 user_add_to_gc_queue(user);
 523
 524         if (fifo_fd >= 0)
 525                 close_nointr_nofail(fifo_fd);
 526
 527         if (reply)
 528                 dbus_message_unref(reply);
 529
 530         return r;
 531 }
 532
 533 static bool device_has_tag(struct udev_device *d, const char *tag) {
 534         struct udev_list_entry *first, *item;
 535
 536         assert(d);
 537         assert(tag);
 538
 539         udev_device_get_is_initialized(d);
 540
 541         first = udev_device_get_tags_list_entry(d);
 542         udev_list_entry_foreach(item, first)
 543                 if (streq(udev_list_entry_get_name(item), tag))
 544                         return true;
 545
 546         return false;
 547 }
 548
 549 static int attach_device(Manager *m, const char *seat, const char *sysfs) {
 550         struct udev_device *d;
 551         char *rule = NULL, *file = NULL;
 552         const char *id_for_seat;
 553         int r;
 554         struct udev_enumerate *e;
 555         struct udev_list_entry *first, *item;
 556
 557         assert(m);
 558         assert(seat);
 559         assert(sysfs);
 560
 561         d = udev_device_new_from_syspath(m->udev, sysfs);
 562         if (!d)
 563                 return -ENODEV;
 564
 565         if (!device_has_tag(d, "seat")) {
 566                 r = -ENODEV;
 567                 goto finish;
 568         }
 569
 570         id_for_seat = udev_device_get_property_value(d, "ID_FOR_SEAT");
 571         if (!id_for_seat) {
 572                 r = -ENODEV;
 573                 goto finish;
 574         }
 575
 576         if (asprintf(&file, "/etc/udev/rules.d/72-seat-%s.rules", id_for_seat) < 0) {
 577                 r = -ENOMEM;
 578                 goto finish;
 579         }
 580
 581         if (asprintf(&rule, "TAG==\"seat\", ENV{ID_FOR_SEAT}==\"%s\", ENV{ID_SEAT}=\"%s\"", id_for_seat, seat) < 0) {
 582                 r = -ENOMEM;
 583                 goto finish;
 584         }
 585
 586         mkdir_p("/etc/udev/rules.d", 0755);
 587         r = write_one_line_file(file, rule);
 588         if (r < 0)
 589                 goto finish;
 590
 591         e = udev_enumerate_new(m->udev);
 592         if (!e) {
 593                 r = -ENOMEM;
 594                 goto finish;
 595         }
 596
 597         if (udev_enumerate_scan_devices(e) < 0) {
 598                 r = -EIO;
 599                 goto finish;
 600         }
 601
 602         first = udev_enumerate_get_list_entry(e);
 603         udev_list_entry_foreach(item, first) {
 604                 char *t;
 605                 const char *p;
 606
 607                 p = udev_list_entry_get_name(item);
 608                 if (!path_startswith(p, sysfs))
 609                         continue;
 610
 611                 t = strappend(p, "/uevent");
 612                 if (!t) {
 613                         r = -ENOMEM;
 614                         goto finish;
 615                 }
 616
 617                 write_one_line_file(t, "change");
 618                 free(t);
 619         }
 620
 621 finish:
 622         free(rule);
 623         free(file);
 624
 625         if (d)
 626                 udev_device_unref(d);
 627
 628         if (e)
 629                 udev_enumerate_unref(e);
 630
 631         return r;
 632 }
 633
 634 static DBusHandlerResult manager_message_handler(
 635                 DBusConnection *connection,
 636                 DBusMessage *message,
 637                 void *userdata) {
 638
 639         Manager *m = userdata;
 640
 641         const BusProperty properties[] = {
 642                 { "org.freedesktop.login1.Manager", "ControlGroupHierarchy",  bus_property_append_string,   "s",  m->cgroup_path          },
 643                 { "org.freedesktop.login1.Manager", "Controllers",            bus_property_append_strv,     "as", m->controllers          },
 644                 { "org.freedesktop.login1.Manager", "NAutoVTs",               bus_property_append_unsigned, "u",  &m->n_autovts           },
 645                 { "org.freedesktop.login1.Manager", "KillOnlyUsers",          bus_property_append_strv,     "as", m->kill_only_users      },
 646                 { "org.freedesktop.login1.Manager", "KillExcludeUsers",       bus_property_append_strv,     "as", m->kill_exclude_users   },
 647                 { "org.freedesktop.login1.Manager", "KillUserProcesses",      bus_property_append_bool,     "b",  &m->kill_user_processes },
 648                 { "org.freedesktop.login1.Manager", "IdleHint",               bus_manager_append_idle_hint, "b",  m                       },
 649                 { "org.freedesktop.login1.Manager", "IdleSinceHint",          bus_manager_append_idle_hint_since, "t", m                  },
 650                 { "org.freedesktop.login1.Manager", "IdleSinceHintMonotonic", bus_manager_append_idle_hint_since, "t", m                  },
 651                 { NULL, NULL, NULL, NULL, NULL }
 652         };
 653
 654         DBusError error;
 655         DBusMessage *reply = NULL;
 656         int r;
 657
 658         assert(connection);
 659         assert(message);
 660         assert(m);
 661
 662         dbus_error_init(&error);
 663
 664         if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "GetSession")) {
 665                 const char *name;
 666                 char *p;
 667                 Session *session;
 668                 bool b;
 669
 670                 if (!dbus_message_get_args(
 671                                     message,
 672                                     &error,
 673                                     DBUS_TYPE_STRING, &name,
 674                                     DBUS_TYPE_INVALID))
 675                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 676
 677                 session = hashmap_get(m->sessions, name);
 678                 if (!session)
 679                         return bus_send_error_reply(connection, message, &error, -ENOENT);
 680
 681                 reply = dbus_message_new_method_return(message);
 682                 if (!reply)
 683                         goto oom;
 684
 685                 p = session_bus_path(session);
 686                 if (!p)
 687                         goto oom;
 688
 689                 b = dbus_message_append_args(
 690                                 reply,
 691                                 DBUS_TYPE_OBJECT_PATH, &p,
 692                                 DBUS_TYPE_INVALID);
 693                 free(p);
 694
 695                 if (!b)
 696                         goto oom;
 697
 698         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "GetUser")) {
 699                 uint32_t uid;
 700                 char *p;
 701                 User *user;
 702                 bool b;
 703
 704                 if (!dbus_message_get_args(
 705                                     message,
 706                                     &error,
 707                                     DBUS_TYPE_UINT32, &uid,
 708                                     DBUS_TYPE_INVALID))
 709                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 710
 711                 user = hashmap_get(m->users, ULONG_TO_PTR((unsigned long) uid));
 712                 if (!user)
 713                         return bus_send_error_reply(connection, message, &error, -ENOENT);
 714
 715                 reply = dbus_message_new_method_return(message);
 716                 if (!reply)
 717                         goto oom;
 718
 719                 p = user_bus_path(user);
 720                 if (!p)
 721                         goto oom;
 722
 723                 b = dbus_message_append_args(
 724                                 reply,
 725                                 DBUS_TYPE_OBJECT_PATH, &p,
 726                                 DBUS_TYPE_INVALID);
 727                 free(p);
 728
 729                 if (!b)
 730                         goto oom;
 731
 732         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "GetSeat")) {
 733                 const char *name;
 734                 char *p;
 735                 Seat *seat;
 736                 bool b;
 737
 738                 if (!dbus_message_get_args(
 739                                     message,
 740                                     &error,
 741                                     DBUS_TYPE_STRING, &name,
 742                                     DBUS_TYPE_INVALID))
 743                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 744
 745                 seat = hashmap_get(m->seats, name);
 746                 if (!seat)
 747                         return bus_send_error_reply(connection, message, &error, -ENOENT);
 748
 749                 reply = dbus_message_new_method_return(message);
 750                 if (!reply)
 751                         goto oom;
 752
 753                 p = seat_bus_path(seat);
 754                 if (!p)
 755                         goto oom;
 756
 757                 b = dbus_message_append_args(
 758                                 reply,
 759                                 DBUS_TYPE_OBJECT_PATH, &p,
 760                                 DBUS_TYPE_INVALID);
 761                 free(p);
 762
 763                 if (!b)
 764                         goto oom;
 765
 766         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "ListSessions")) {
 767                 char *p;
 768                 Session *session;
 769                 Iterator i;
 770                 DBusMessageIter iter, sub;
 771                 const char *empty = "";
 772
 773                 reply = dbus_message_new_method_return(message);
 774                 if (!reply)
 775                         goto oom;
 776
 777                 dbus_message_iter_init_append(reply, &iter);
 778
 779                 if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "(susso)", &sub))
 780                         goto oom;
 781
 782                 HASHMAP_FOREACH(session, m->sessions, i) {
 783                         DBusMessageIter sub2;
 784                         uint32_t uid;
 785
 786                         if (!dbus_message_iter_open_container(&sub, DBUS_TYPE_STRUCT, NULL, &sub2))
 787                                 goto oom;
 788
 789                         uid = session->user->uid;
 790
 791                         p = session_bus_path(session);
 792                         if (!p)
 793                                 goto oom;
 794
 795                         if (!dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &session->id) ||
 796                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_UINT32, &uid) ||
 797                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &session->user->name) ||
 798                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, session->seat ? (const char**) &session->seat->id : &empty) ||
 799                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_OBJECT_PATH, &p)) {
 800                                 free(p);
 801                                 goto oom;
 802                         }
 803
 804                         free(p);
 805
 806                         if (!dbus_message_iter_close_container(&sub, &sub2))
 807                                 goto oom;
 808                 }
 809
 810                 if (!dbus_message_iter_close_container(&iter, &sub))
 811                         goto oom;
 812
 813         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "ListUsers")) {
 814                 char *p;
 815                 User *user;
 816                 Iterator i;
 817                 DBusMessageIter iter, sub;
 818
 819                 reply = dbus_message_new_method_return(message);
 820                 if (!reply)
 821                         goto oom;
 822
 823                 dbus_message_iter_init_append(reply, &iter);
 824
 825                 if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "(uso)", &sub))
 826                         goto oom;
 827
 828                 HASHMAP_FOREACH(user, m->users, i) {
 829                         DBusMessageIter sub2;
 830                         uint32_t uid;
 831
 832                         if (!dbus_message_iter_open_container(&sub, DBUS_TYPE_STRUCT, NULL, &sub2))
 833                                 goto oom;
 834
 835                         uid = user->uid;
 836
 837                         p = user_bus_path(user);
 838                         if (!p)
 839                                 goto oom;
 840
 841                         if (!dbus_message_iter_append_basic(&sub2, DBUS_TYPE_UINT32, &uid) ||
 842                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &user->name) ||
 843                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_OBJECT_PATH, &p)) {
 844                                 free(p);
 845                                 goto oom;
 846                         }
 847
 848                         free(p);
 849
 850                         if (!dbus_message_iter_close_container(&sub, &sub2))
 851                                 goto oom;
 852                 }
 853
 854                 if (!dbus_message_iter_close_container(&iter, &sub))
 855                         goto oom;
 856
 857         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "ListSeats")) {
 858                 char *p;
 859                 Seat *seat;
 860                 Iterator i;
 861                 DBusMessageIter iter, sub;
 862
 863                 reply = dbus_message_new_method_return(message);
 864                 if (!reply)
 865                         goto oom;
 866
 867                 dbus_message_iter_init_append(reply, &iter);
 868
 869                 if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "(so)", &sub))
 870                         goto oom;
 871
 872                 HASHMAP_FOREACH(seat, m->seats, i) {
 873                         DBusMessageIter sub2;
 874
 875                         if (!dbus_message_iter_open_container(&sub, DBUS_TYPE_STRUCT, NULL, &sub2))
 876                                 goto oom;
 877
 878                         p = seat_bus_path(seat);
 879                         if (!p)
 880                                 goto oom;
 881
 882                         if (!dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &seat->id) ||
 883                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_OBJECT_PATH, &p)) {
 884                                 free(p);
 885                                 goto oom;
 886                         }
 887
 888                         free(p);
 889
 890                         if (!dbus_message_iter_close_container(&sub, &sub2))
 891                                 goto oom;
 892                 }
 893
 894                 if (!dbus_message_iter_close_container(&iter, &sub))
 895                         goto oom;
 896
 897         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "CreateSession")) {
 898
 899                 r = bus_manager_create_session(m, message, &reply);
 900                 if (r == -ENOMEM)
 901                         goto oom;
 902
 903                 if (r < 0)
 904                         return bus_send_error_reply(connection, message, &error, r);
 905
 906         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "ActivateSession")) {
 907                 const char *name;
 908                 Session *session;
 909
 910                 if (!dbus_message_get_args(
 911                                     message,
 912                                     &error,
 913                                     DBUS_TYPE_STRING, &name,
 914                                     DBUS_TYPE_INVALID))
 915                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 916
 917                 session = hashmap_get(m->sessions, name);
 918                 if (!session)
 919                         return bus_send_error_reply(connection, message, &error, -ENOENT);
 920
 921                 r = session_activate(session);
 922                 if (r < 0)
 923                         return bus_send_error_reply(connection, message, NULL, r);
 924
 925                 reply = dbus_message_new_method_return(message);
 926                 if (!reply)
 927                         goto oom;
 928
 929         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "TerminateSession")) {
 930                 const char *name;
 931                 Session *session;
 932
 933                 if (!dbus_message_get_args(
 934                                     message,
 935                                     &error,
 936                                     DBUS_TYPE_STRING, &name,
 937                                     DBUS_TYPE_INVALID))
 938                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 939
 940                 session = hashmap_get(m->sessions, name);
 941                 if (!session)
 942                         return bus_send_error_reply(connection, message, &error, -ENOENT);
 943
 944                 r = session_stop(session);
 945                 if (r < 0)
 946                         return bus_send_error_reply(connection, message, NULL, r);
 947
 948                 reply = dbus_message_new_method_return(message);
 949                 if (!reply)
 950                         goto oom;
 951
 952         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "TerminateUser")) {
 953                 uint32_t uid;
 954                 User *user;
 955
 956                 if (!dbus_message_get_args(
 957                                     message,
 958                                     &error,
 959                                     DBUS_TYPE_UINT32, &uid,
 960                                     DBUS_TYPE_INVALID))
 961                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 962
 963                 user = hashmap_get(m->users, ULONG_TO_PTR((unsigned long) uid));
 964                 if (!user)
 965                         return bus_send_error_reply(connection, message, &error, -ENOENT);
 966
 967                 r = user_stop(user);
 968                 if (r < 0)
 969                         return bus_send_error_reply(connection, message, NULL, r);
 970
 971                 reply = dbus_message_new_method_return(message);
 972                 if (!reply)
 973                         goto oom;
 974
 975         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "TerminateSeat")) {
 976                 const char *name;
 977                 Seat *seat;
 978
 979                 if (!dbus_message_get_args(
 980                                     message,
 981                                     &error,
 982                                     DBUS_TYPE_STRING, &name,
 983                                     DBUS_TYPE_INVALID))
 984                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 985
 986                 seat = hashmap_get(m->seats, name);
 987                 if (!seat)
 988                         return bus_send_error_reply(connection, message, &error, -ENOENT);
 989
 990                 r = seat_stop_sessions(seat);
 991                 if (r < 0)
 992                         return bus_send_error_reply(connection, message, NULL, r);
 993
 994                 reply = dbus_message_new_method_return(message);
 995                 if (!reply)
 996                         goto oom;
 997
 998         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "SetUserLinger")) {
 999                 uint32_t uid;
1000                 struct passwd *pw;
1001                 dbus_bool_t b, interactive;
1002                 char *path;
1003
1004                 if (!dbus_message_get_args(
1005                                     message,
1006                                     &error,
1007                                     DBUS_TYPE_UINT32, &uid,
1008                                     DBUS_TYPE_BOOLEAN, &b,
1009                                     DBUS_TYPE_BOOLEAN, &interactive,
1010                                     DBUS_TYPE_INVALID))
1011                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1012
1013                 errno = 0;
1014                 pw = getpwuid(uid);
1015                 if (!pw)
1016                         return bus_send_error_reply(connection, message, NULL, errno ? -errno : -EINVAL);
1017
1018                 r = verify_polkit(connection, message, "org.freedesktop.login1.set-user-linger", interactive, &error);
1019                 if (r < 0)
1020                         return bus_send_error_reply(connection, message, &error, r);
1021
1022                 r = safe_mkdir("/var/lib/systemd/linger", 0755, 0, 0);
1023                 if (r < 0)
1024                         return bus_send_error_reply(connection, message, &error, r);
1025
1026                 path = strappend("/var/lib/systemd/linger/", pw->pw_name);
1027                 if (!path)
1028                         goto oom;
1029
1030                 if (b) {
1031                         User *u;
1032
1033                         r = touch(path);
1034                         free(path);
1035
1036                         if (r < 0)
1037                                 return bus_send_error_reply(connection, message, &error, r);
1038
1039                         if (manager_add_user_by_uid(m, uid, &u) >= 0)
1040                                 user_start(u);
1041
1042                 } else {
1043                         User *u;
1044
1045                         r = unlink(path);
1046                         free(path);
1047
1048                         if (r < 0 && errno != ENOENT)
1049                                 return bus_send_error_reply(connection, message, &error, -errno);
1050
1051                         u = hashmap_get(m->users, ULONG_TO_PTR((unsigned long) uid));
1052                         if (u)
1053                                 user_add_to_gc_queue(u);
1054                 }
1055
1056                 reply = dbus_message_new_method_return(message);
1057                 if (!reply)
1058                         goto oom;
1059
1060         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "AttachDevice")) {
1061                 const char *sysfs, *seat;
1062                 dbus_bool_t interactive;
1063
1064                 if (!dbus_message_get_args(
1065                                     message,
1066                                     &error,
1067                                     DBUS_TYPE_STRING, &seat,
1068                                     DBUS_TYPE_STRING, &sysfs,
1069                                     DBUS_TYPE_BOOLEAN, &interactive,
1070                                     DBUS_TYPE_INVALID))
1071                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1072
1073                 if (!path_startswith(sysfs, "/sys") || !seat_name_is_valid(seat))
1074                         return bus_send_error_reply(connection, message, NULL, -EINVAL);
1075
1076                 r = verify_polkit(connection, message, "org.freedesktop.login1.attach-device", interactive, &error);
1077                 if (r < 0)
1078                         return bus_send_error_reply(connection, message, &error, r);
1079
1080                 r = attach_device(m, seat, sysfs);
1081                 if (r < 0)
1082                         return bus_send_error_reply(connection, message, NULL, -EINVAL);
1083
1084                 reply = dbus_message_new_method_return(message);
1085                 if (!reply)
1086                         goto oom;
1087
1088         } else if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Introspectable", "Introspect")) {
1089                 char *introspection = NULL;
1090                 FILE *f;
1091                 Iterator i;
1092                 Session *session;
1093                 Seat *seat;
1094                 User *user;
1095                 size_t size;
1096                 char *p;
1097
1098                 if (!(reply = dbus_message_new_method_return(message)))
1099                         goto oom;
1100
1101                 /* We roll our own introspection code here, instead of
1102                  * relying on bus_default_message_handler() because we
1103                  * need to generate our introspection string
1104                  * dynamically. */
1105
1106                 if (!(f = open_memstream(&introspection, &size)))
1107                         goto oom;
1108
1109                 fputs(INTROSPECTION_BEGIN, f);
1110
1111                 HASHMAP_FOREACH(seat, m->seats, i) {
1112                         p = bus_path_escape(seat->id);
1113
1114                         if (p) {
1115                                 fprintf(f, "<node name=\"seat/%s\"/>", p);
1116                                 free(p);
1117                         }
1118                 }
1119
1120                 HASHMAP_FOREACH(user, m->users, i)
1121                         fprintf(f, "<node name=\"user/%llu\"/>", (unsigned long long) user->uid);
1122
1123                 HASHMAP_FOREACH(session, m->sessions, i) {
1124                         p = bus_path_escape(session->id);
1125
1126                         if (p) {
1127                                 fprintf(f, "<node name=\"session/%s\"/>", p);
1128                                 free(p);
1129                         }
1130                 }
1131
1132                 fputs(INTROSPECTION_END, f);
1133
1134                 if (ferror(f)) {
1135                         fclose(f);
1136                         free(introspection);
1137                         goto oom;
1138                 }
1139
1140                 fclose(f);
1141
1142                 if (!introspection)
1143                         goto oom;
1144
1145                 if (!dbus_message_append_args(reply, DBUS_TYPE_STRING, &introspection, DBUS_TYPE_INVALID)) {
1146                         free(introspection);
1147                         goto oom;
1148                 }
1149
1150                 free(introspection);
1151         } else
1152                 return bus_default_message_handler(connection, message, NULL, INTERFACES_LIST, properties);
1153
1154         if (reply) {
1155                 if (!dbus_connection_send(connection, reply, NULL))
1156                         goto oom;
1157
1158                 dbus_message_unref(reply);
1159         }
1160
1161         return DBUS_HANDLER_RESULT_HANDLED;
1162
1163 oom:
1164         if (reply)
1165                 dbus_message_unref(reply);
1166
1167         dbus_error_free(&error);
1168
1169         return DBUS_HANDLER_RESULT_NEED_MEMORY;
1170 }
1171
1172 const DBusObjectPathVTable bus_manager_vtable = {
1173         .message_function = manager_message_handler
1174 };
1175
1176 DBusHandlerResult bus_message_filter(
1177                 DBusConnection *connection,
1178                 DBusMessage *message,
1179                 void *userdata) {
1180
1181         Manager *m = userdata;
1182         DBusError error;
1183
1184         assert(m);
1185         assert(connection);
1186         assert(message);
1187
1188         dbus_error_init(&error);
1189
1190         if (dbus_message_is_signal(message, "org.freedesktop.systemd1.Agent", "Released")) {
1191                 const char *cgroup;
1192
1193                 if (!dbus_message_get_args(message, &error,
1194                                            DBUS_TYPE_STRING, &cgroup,
1195                                            DBUS_TYPE_INVALID))
1196                         log_error("Failed to parse Released message: %s", bus_error_message(&error));
1197                 else
1198                         manager_cgroup_notify_empty(m, cgroup);
1199         }
1200
1201         dbus_error_free(&error);
1202
1203         return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
1204 }
1205
1206 int manager_send_changed(Manager *manager, const char *properties) {
1207         DBusMessage *m;
1208         int r = -ENOMEM;
1209
1210         assert(manager);
1211
1212         m = bus_properties_changed_new("/org/freedesktop/login1", "org.freedesktop.login1.Manager", properties);
1213         if (!m)
1214                 goto finish;
1215
1216         if (!dbus_connection_send(manager->bus, m, NULL))
1217                 goto finish;
1218
1219         r = 0;
1220
1221 finish:
1222         if (m)
1223                 dbus_message_unref(m);
1224
1225         return r;
1226 }