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 pipe_fds[2] = { -1, -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                         /* Session already exists, client is probably
 357                          * something like "su" which changes uid but
 358                          * is still the same audit session */
 359
 360                         reply = dbus_message_new_method_return(message);
 361                         if (!reply) {
 362                                 r = -ENOMEM;
 363                                 goto fail;
 364                         }
 365
 366                         /* Create a throw-away fd */
 367                         if (pipe(pipe_fds) < 0) {
 368                                 r = -errno;
 369                                 goto fail;
 370                         }
 371
 372                         close_nointr_nofail(pipe_fds[0]);
 373                         pipe_fds[0] = -1;
 374
 375                         p = session_bus_path(session);
 376                         if (!p) {
 377                                 r = -ENOMEM;
 378                                 goto fail;
 379                         }
 380
 381                         b = dbus_message_append_args(
 382                                         reply,
 383                                         DBUS_TYPE_STRING, &session->id,
 384                                         DBUS_TYPE_OBJECT_PATH, &p,
 385                                         DBUS_TYPE_STRING, &session->user->runtime_path,
 386                                         DBUS_TYPE_UNIX_FD, &pipe_fds[1],
 387                                         DBUS_TYPE_INVALID);
 388                         free(p);
 389
 390                         if (!b) {
 391                                 r = -ENOMEM;
 392                                 goto fail;
 393                         }
 394
 395                         close_nointr_nofail(pipe_fds[1]);
 396                         *_reply = reply;
 397
 398                         return 0;
 399                 }
 400
 401         } else {
 402                 do {
 403                         free(id);
 404                         asprintf(&id, "c%lu", ++m->session_counter);
 405
 406                         if (!id) {
 407                                 r = -ENOMEM;
 408                                 goto fail;
 409                         }
 410
 411                 } while (hashmap_get(m->sessions, id));
 412         }
 413
 414         r = manager_add_session(m, user, id, &session);
 415         free(id);
 416         if (r < 0)
 417                 goto fail;
 418
 419         session->leader = leader;
 420         session->audit_id = audit_id;
 421         session->type = t;
 422         session->remote = remote;
 423         session->controllers = controllers;
 424         session->reset_controllers = reset_controllers;
 425         session->kill_processes = kill_processes;
 426         session->vtnr = vtnr;
 427
 428         controllers = reset_controllers = NULL;
 429
 430         if (!isempty(tty)) {
 431                 session->tty = strdup(tty);
 432                 if (!session->tty) {
 433                         r = -ENOMEM;
 434                         goto fail;
 435                 }
 436         }
 437
 438         if (!isempty(display)) {
 439                 session->display = strdup(display);
 440                 if (!session->display) {
 441                         r = -ENOMEM;
 442                         goto fail;
 443                 }
 444         }
 445
 446         if (!isempty(remote_user)) {
 447                 session->remote_user = strdup(remote_user);
 448                 if (!session->remote_user) {
 449                         r = -ENOMEM;
 450                         goto fail;
 451                 }
 452         }
 453
 454         if (!isempty(remote_host)) {
 455                 session->remote_host = strdup(remote_host);
 456                 if (!session->remote_host) {
 457                         r = -ENOMEM;
 458                         goto fail;
 459                 }
 460         }
 461
 462         if (!isempty(service)) {
 463                 session->service = strdup(service);
 464                 if (!session->service) {
 465                         r = -ENOMEM;
 466                         goto fail;
 467                 }
 468         }
 469
 470         if (pipe(pipe_fds) < 0) {
 471                 r = -errno;
 472                 goto fail;
 473         }
 474
 475         r = session_set_pipe_fd(session, pipe_fds[0]);
 476         if (r < 0)
 477                 goto fail;
 478         pipe_fds[0] = -1;
 479
 480         if (s) {
 481                 r = seat_attach_session(s, session);
 482                 if (r < 0)
 483                         goto fail;
 484         }
 485
 486         r = session_start(session);
 487         if (r < 0)
 488                 goto fail;
 489
 490         reply = dbus_message_new_method_return(message);
 491         if (!reply) {
 492                 r = -ENOMEM;
 493                 goto fail;
 494         }
 495
 496         p = session_bus_path(session);
 497         if (!p) {
 498                 r = -ENOMEM;
 499                 goto fail;
 500         }
 501
 502         b = dbus_message_append_args(
 503                         reply,
 504                         DBUS_TYPE_STRING, &session->id,
 505                         DBUS_TYPE_OBJECT_PATH, &p,
 506                         DBUS_TYPE_STRING, &session->user->runtime_path,
 507                         DBUS_TYPE_UNIX_FD, &pipe_fds[1],
 508                         DBUS_TYPE_INVALID);
 509         free(p);
 510
 511         if (!b) {
 512                 r = -ENOMEM;
 513                 goto fail;
 514         }
 515
 516         close_nointr_nofail(pipe_fds[1]);
 517         *_reply = reply;
 518
 519         return 0;
 520
 521 fail:
 522         strv_free(controllers);
 523         strv_free(reset_controllers);
 524
 525         if (session)
 526                 session_add_to_gc_queue(session);
 527
 528         if (user)
 529                 user_add_to_gc_queue(user);
 530
 531         close_pipe(pipe_fds);
 532
 533         if (reply)
 534                 dbus_message_unref(reply);
 535
 536         return r;
 537 }
 538
 539 static bool device_has_tag(struct udev_device *d, const char *tag) {
 540         struct udev_list_entry *first, *item;
 541
 542         assert(d);
 543         assert(tag);
 544
 545         udev_device_get_is_initialized(d);
 546
 547         first = udev_device_get_tags_list_entry(d);
 548         udev_list_entry_foreach(item, first)
 549                 if (streq(udev_list_entry_get_name(item), tag))
 550                         return true;
 551
 552         return false;
 553 }
 554
 555 static int attach_device(Manager *m, const char *seat, const char *sysfs) {
 556         struct udev_device *d;
 557         char *rule = NULL, *file = NULL;
 558         const char *id_for_seat;
 559         int r;
 560         struct udev_enumerate *e;
 561         struct udev_list_entry *first, *item;
 562
 563         assert(m);
 564         assert(seat);
 565         assert(sysfs);
 566
 567         d = udev_device_new_from_syspath(m->udev, sysfs);
 568         if (!d)
 569                 return -ENODEV;
 570
 571         if (!device_has_tag(d, "seat")) {
 572                 r = -ENODEV;
 573                 goto finish;
 574         }
 575
 576         id_for_seat = udev_device_get_property_value(d, "ID_FOR_SEAT");
 577         if (!id_for_seat) {
 578                 r = -ENODEV;
 579                 goto finish;
 580         }
 581
 582         if (asprintf(&file, "/etc/udev/rules.d/72-seat-%s.rules", id_for_seat) < 0) {
 583                 r = -ENOMEM;
 584                 goto finish;
 585         }
 586
 587         if (asprintf(&rule, "TAG==\"seat\", ENV{ID_FOR_SEAT}==\"%s\", ENV{ID_SEAT}=\"%s\"", id_for_seat, seat) < 0) {
 588                 r = -ENOMEM;
 589                 goto finish;
 590         }
 591
 592         mkdir_p("/etc/udev/rules.d", 0755);
 593         r = write_one_line_file(file, rule);
 594         if (r < 0)
 595                 goto finish;
 596
 597         e = udev_enumerate_new(m->udev);
 598         if (!e) {
 599                 r = -ENOMEM;
 600                 goto finish;
 601         }
 602
 603         if (udev_enumerate_scan_devices(e) < 0) {
 604                 r = -EIO;
 605                 goto finish;
 606         }
 607
 608         first = udev_enumerate_get_list_entry(e);
 609         udev_list_entry_foreach(item, first) {
 610                 char *t;
 611                 const char *p;
 612
 613                 p = udev_list_entry_get_name(item);
 614                 if (!startswith(p, sysfs))
 615                         continue;
 616
 617                 t = strappend(p, "/uevent");
 618                 if (!t) {
 619                         r = -ENOMEM;
 620                         goto finish;
 621                 }
 622
 623                 write_one_line_file(t, "change");
 624                 free(t);
 625         }
 626
 627 finish:
 628         free(rule);
 629         free(file);
 630
 631         if (d)
 632                 udev_device_unref(d);
 633
 634         if (e)
 635                 udev_enumerate_unref(e);
 636
 637         return r;
 638 }
 639
 640 static DBusHandlerResult manager_message_handler(
 641                 DBusConnection *connection,
 642                 DBusMessage *message,
 643                 void *userdata) {
 644
 645         Manager *m = userdata;
 646
 647         const BusProperty properties[] = {
 648                 { "org.freedesktop.login1.Manager", "ControlGroupHierarchy",  bus_property_append_string,   "s",  m->cgroup_path          },
 649                 { "org.freedesktop.login1.Manager", "Controllers",            bus_property_append_strv,     "as", m->controllers          },
 650                 { "org.freedesktop.login1.Manager", "NAutoVTs",               bus_property_append_unsigned, "u",  &m->n_autovts           },
 651                 { "org.freedesktop.login1.Manager", "KillOnlyUsers",          bus_property_append_strv,     "as", m->kill_only_users      },
 652                 { "org.freedesktop.login1.Manager", "KillExcludeUsers",       bus_property_append_strv,     "as", m->kill_exclude_users   },
 653                 { "org.freedesktop.login1.Manager", "KillUserProcesses",      bus_property_append_bool,     "b",  &m->kill_user_processes },
 654                 { "org.freedesktop.login1.Manager", "IdleHint",               bus_manager_append_idle_hint, "b",  m                       },
 655                 { "org.freedesktop.login1.Manager", "IdleSinceHint",          bus_manager_append_idle_hint_since, "t", m                  },
 656                 { "org.freedesktop.login1.Manager", "IdleSinceHintMonotonic", bus_manager_append_idle_hint_since, "t", m                  },
 657                 { NULL, NULL, NULL, NULL, NULL }
 658         };
 659
 660         DBusError error;
 661         DBusMessage *reply = NULL;
 662         int r;
 663
 664         assert(connection);
 665         assert(message);
 666         assert(m);
 667
 668         dbus_error_init(&error);
 669
 670         if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "GetSession")) {
 671                 const char *name;
 672                 char *p;
 673                 Session *session;
 674                 bool b;
 675
 676                 if (!dbus_message_get_args(
 677                                     message,
 678                                     &error,
 679                                     DBUS_TYPE_STRING, &name,
 680                                     DBUS_TYPE_INVALID))
 681                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 682
 683                 session = hashmap_get(m->sessions, name);
 684                 if (!session)
 685                         return bus_send_error_reply(connection, message, &error, -ENOENT);
 686
 687                 reply = dbus_message_new_method_return(message);
 688                 if (!reply)
 689                         goto oom;
 690
 691                 p = session_bus_path(session);
 692                 if (!p)
 693                         goto oom;
 694
 695                 b = dbus_message_append_args(
 696                                 reply,
 697                                 DBUS_TYPE_OBJECT_PATH, &p,
 698                                 DBUS_TYPE_INVALID);
 699                 free(p);
 700
 701                 if (!b)
 702                         goto oom;
 703
 704         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "GetUser")) {
 705                 uint32_t uid;
 706                 char *p;
 707                 User *user;
 708                 bool b;
 709
 710                 if (!dbus_message_get_args(
 711                                     message,
 712                                     &error,
 713                                     DBUS_TYPE_UINT32, &uid,
 714                                     DBUS_TYPE_INVALID))
 715                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 716
 717                 user = hashmap_get(m->users, ULONG_TO_PTR((unsigned long) uid));
 718                 if (!user)
 719                         return bus_send_error_reply(connection, message, &error, -ENOENT);
 720
 721                 reply = dbus_message_new_method_return(message);
 722                 if (!reply)
 723                         goto oom;
 724
 725                 p = user_bus_path(user);
 726                 if (!p)
 727                         goto oom;
 728
 729                 b = dbus_message_append_args(
 730                                 reply,
 731                                 DBUS_TYPE_OBJECT_PATH, &p,
 732                                 DBUS_TYPE_INVALID);
 733                 free(p);
 734
 735                 if (!b)
 736                         goto oom;
 737
 738         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "GetSeat")) {
 739                 const char *name;
 740                 char *p;
 741                 Seat *seat;
 742                 bool b;
 743
 744                 if (!dbus_message_get_args(
 745                                     message,
 746                                     &error,
 747                                     DBUS_TYPE_STRING, &name,
 748                                     DBUS_TYPE_INVALID))
 749                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 750
 751                 seat = hashmap_get(m->seats, name);
 752                 if (!seat)
 753                         return bus_send_error_reply(connection, message, &error, -ENOENT);
 754
 755                 reply = dbus_message_new_method_return(message);
 756                 if (!reply)
 757                         goto oom;
 758
 759                 p = seat_bus_path(seat);
 760                 if (!p)
 761                         goto oom;
 762
 763                 b = dbus_message_append_args(
 764                                 reply,
 765                                 DBUS_TYPE_OBJECT_PATH, &p,
 766                                 DBUS_TYPE_INVALID);
 767                 free(p);
 768
 769                 if (!b)
 770                         goto oom;
 771
 772         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "ListSessions")) {
 773                 char *p;
 774                 Session *session;
 775                 Iterator i;
 776                 DBusMessageIter iter, sub;
 777                 const char *empty = "";
 778
 779                 reply = dbus_message_new_method_return(message);
 780                 if (!reply)
 781                         goto oom;
 782
 783                 dbus_message_iter_init_append(reply, &iter);
 784
 785                 if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "(susso)", &sub))
 786                         goto oom;
 787
 788                 HASHMAP_FOREACH(session, m->sessions, i) {
 789                         DBusMessageIter sub2;
 790                         uint32_t uid;
 791
 792                         if (!dbus_message_iter_open_container(&sub, DBUS_TYPE_STRUCT, NULL, &sub2))
 793                                 goto oom;
 794
 795                         uid = session->user->uid;
 796
 797                         p = session_bus_path(session);
 798                         if (!p)
 799                                 goto oom;
 800
 801                         if (!dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &session->id) ||
 802                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_UINT32, &uid) ||
 803                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &session->user->name) ||
 804                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, session->seat ? (const char**) &session->seat->id : &empty) ||
 805                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_OBJECT_PATH, &p)) {
 806                                 free(p);
 807                                 goto oom;
 808                         }
 809
 810                         free(p);
 811
 812                         if (!dbus_message_iter_close_container(&sub, &sub2))
 813                                 goto oom;
 814                 }
 815
 816                 if (!dbus_message_iter_close_container(&iter, &sub))
 817                         goto oom;
 818
 819         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "ListUsers")) {
 820                 char *p;
 821                 User *user;
 822                 Iterator i;
 823                 DBusMessageIter iter, sub;
 824
 825                 reply = dbus_message_new_method_return(message);
 826                 if (!reply)
 827                         goto oom;
 828
 829                 dbus_message_iter_init_append(reply, &iter);
 830
 831                 if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "(uso)", &sub))
 832                         goto oom;
 833
 834                 HASHMAP_FOREACH(user, m->users, i) {
 835                         DBusMessageIter sub2;
 836                         uint32_t uid;
 837
 838                         if (!dbus_message_iter_open_container(&sub, DBUS_TYPE_STRUCT, NULL, &sub2))
 839                                 goto oom;
 840
 841                         uid = user->uid;
 842
 843                         p = user_bus_path(user);
 844                         if (!p)
 845                                 goto oom;
 846
 847                         if (!dbus_message_iter_append_basic(&sub2, DBUS_TYPE_UINT32, &uid) ||
 848                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &user->name) ||
 849                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_OBJECT_PATH, &p)) {
 850                                 free(p);
 851                                 goto oom;
 852                         }
 853
 854                         free(p);
 855
 856                         if (!dbus_message_iter_close_container(&sub, &sub2))
 857                                 goto oom;
 858                 }
 859
 860                 if (!dbus_message_iter_close_container(&iter, &sub))
 861                         goto oom;
 862
 863         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "ListSeats")) {
 864                 char *p;
 865                 Seat *seat;
 866                 Iterator i;
 867                 DBusMessageIter iter, sub;
 868
 869                 reply = dbus_message_new_method_return(message);
 870                 if (!reply)
 871                         goto oom;
 872
 873                 dbus_message_iter_init_append(reply, &iter);
 874
 875                 if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "(so)", &sub))
 876                         goto oom;
 877
 878                 HASHMAP_FOREACH(seat, m->seats, i) {
 879                         DBusMessageIter sub2;
 880
 881                         if (!dbus_message_iter_open_container(&sub, DBUS_TYPE_STRUCT, NULL, &sub2))
 882                                 goto oom;
 883
 884                         p = seat_bus_path(seat);
 885                         if (!p)
 886                                 goto oom;
 887
 888                         if (!dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &seat->id) ||
 889                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_OBJECT_PATH, &p)) {
 890                                 free(p);
 891                                 goto oom;
 892                         }
 893
 894                         free(p);
 895
 896                         if (!dbus_message_iter_close_container(&sub, &sub2))
 897                                 goto oom;
 898                 }
 899
 900                 if (!dbus_message_iter_close_container(&iter, &sub))
 901                         goto oom;
 902
 903         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "CreateSession")) {
 904
 905                 r = bus_manager_create_session(m, message, &reply);
 906                 if (r == -ENOMEM)
 907                         goto oom;
 908
 909                 if (r < 0)
 910                         return bus_send_error_reply(connection, message, &error, r);
 911
 912         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "ActivateSession")) {
 913                 const char *name;
 914                 Session *session;
 915
 916                 if (!dbus_message_get_args(
 917                                     message,
 918                                     &error,
 919                                     DBUS_TYPE_STRING, &name,
 920                                     DBUS_TYPE_INVALID))
 921                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 922
 923                 session = hashmap_get(m->sessions, name);
 924                 if (!session)
 925                         return bus_send_error_reply(connection, message, &error, -ENOENT);
 926
 927                 r = session_activate(session);
 928                 if (r < 0)
 929                         return bus_send_error_reply(connection, message, NULL, r);
 930
 931                 reply = dbus_message_new_method_return(message);
 932                 if (!reply)
 933                         goto oom;
 934
 935         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "TerminateSession")) {
 936                 const char *name;
 937                 Session *session;
 938
 939                 if (!dbus_message_get_args(
 940                                     message,
 941                                     &error,
 942                                     DBUS_TYPE_STRING, &name,
 943                                     DBUS_TYPE_INVALID))
 944                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 945
 946                 session = hashmap_get(m->sessions, name);
 947                 if (!session)
 948                         return bus_send_error_reply(connection, message, &error, -ENOENT);
 949
 950                 r = session_stop(session);
 951                 if (r < 0)
 952                         return bus_send_error_reply(connection, message, NULL, r);
 953
 954                 reply = dbus_message_new_method_return(message);
 955                 if (!reply)
 956                         goto oom;
 957
 958         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "TerminateUser")) {
 959                 uint32_t uid;
 960                 User *user;
 961
 962                 if (!dbus_message_get_args(
 963                                     message,
 964                                     &error,
 965                                     DBUS_TYPE_UINT32, &uid,
 966                                     DBUS_TYPE_INVALID))
 967                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 968
 969                 user = hashmap_get(m->users, ULONG_TO_PTR((unsigned long) uid));
 970                 if (!user)
 971                         return bus_send_error_reply(connection, message, &error, -ENOENT);
 972
 973                 r = user_stop(user);
 974                 if (r < 0)
 975                         return bus_send_error_reply(connection, message, NULL, r);
 976
 977                 reply = dbus_message_new_method_return(message);
 978                 if (!reply)
 979                         goto oom;
 980
 981         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "TerminateSeat")) {
 982                 const char *name;
 983                 Seat *seat;
 984
 985                 if (!dbus_message_get_args(
 986                                     message,
 987                                     &error,
 988                                     DBUS_TYPE_STRING, &name,
 989                                     DBUS_TYPE_INVALID))
 990                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 991
 992                 seat = hashmap_get(m->seats, name);
 993                 if (!seat)
 994                         return bus_send_error_reply(connection, message, &error, -ENOENT);
 995
 996                 r = seat_stop_sessions(seat);
 997                 if (r < 0)
 998                         return bus_send_error_reply(connection, message, NULL, r);
 999
1000                 reply = dbus_message_new_method_return(message);
1001                 if (!reply)
1002                         goto oom;
1003
1004         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "SetUserLinger")) {
1005                 uint32_t uid;
1006                 struct passwd *pw;
1007                 dbus_bool_t b, interactive;
1008                 char *path;
1009
1010                 if (!dbus_message_get_args(
1011                                     message,
1012                                     &error,
1013                                     DBUS_TYPE_UINT32, &uid,
1014                                     DBUS_TYPE_BOOLEAN, &b,
1015                                     DBUS_TYPE_BOOLEAN, &interactive,
1016                                     DBUS_TYPE_INVALID))
1017                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1018
1019                 errno = 0;
1020                 pw = getpwuid(uid);
1021                 if (!pw)
1022                         return bus_send_error_reply(connection, message, NULL, errno ? -errno : -EINVAL);
1023
1024                 r = verify_polkit(connection, message, "org.freedesktop.login1.set-user-linger", interactive, &error);
1025                 if (r < 0)
1026                         return bus_send_error_reply(connection, message, &error, r);
1027
1028                 r = safe_mkdir("/var/lib/systemd/linger", 0755, 0, 0);
1029                 if (r < 0)
1030                         return bus_send_error_reply(connection, message, &error, r);
1031
1032                 path = strappend("/var/lib/systemd/linger/", pw->pw_name);
1033                 if (!path)
1034                         goto oom;
1035
1036                 if (b) {
1037                         User *u;
1038
1039                         r = touch(path);
1040                         free(path);
1041
1042                         if (r < 0)
1043                                 return bus_send_error_reply(connection, message, &error, r);
1044
1045                         if (manager_add_user_by_uid(m, uid, &u) >= 0)
1046                                 user_start(u);
1047
1048                 } else {
1049                         User *u;
1050
1051                         r = unlink(path);
1052                         free(path);
1053
1054                         if (r < 0 && errno != ENOENT)
1055                                 return bus_send_error_reply(connection, message, &error, -errno);
1056
1057                         u = hashmap_get(m->users, ULONG_TO_PTR((unsigned long) uid));
1058                         if (u)
1059                                 user_add_to_gc_queue(u);
1060                 }
1061
1062                 reply = dbus_message_new_method_return(message);
1063                 if (!reply)
1064                         goto oom;
1065
1066         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "AttachDevice")) {
1067                 const char *sysfs, *seat;
1068                 dbus_bool_t interactive;
1069
1070                 if (!dbus_message_get_args(
1071                                     message,
1072                                     &error,
1073                                     DBUS_TYPE_STRING, &seat,
1074                                     DBUS_TYPE_STRING, &sysfs,
1075                                     DBUS_TYPE_BOOLEAN, &interactive,
1076                                     DBUS_TYPE_INVALID))
1077                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1078
1079                 if (!path_startswith(sysfs, "/sys") || !seat_name_is_valid(seat))
1080                         return bus_send_error_reply(connection, message, NULL, -EINVAL);
1081
1082                 r = verify_polkit(connection, message, "org.freedesktop.login1.attach-device", interactive, &error);
1083                 if (r < 0)
1084                         return bus_send_error_reply(connection, message, &error, r);
1085
1086                 r = attach_device(m, seat, sysfs);
1087                 if (r < 0)
1088                         return bus_send_error_reply(connection, message, NULL, -EINVAL);
1089
1090                 reply = dbus_message_new_method_return(message);
1091                 if (!reply)
1092                         goto oom;
1093
1094         } else if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Introspectable", "Introspect")) {
1095                 char *introspection = NULL;
1096                 FILE *f;
1097                 Iterator i;
1098                 Session *session;
1099                 Seat *seat;
1100                 User *user;
1101                 size_t size;
1102                 char *p;
1103
1104                 if (!(reply = dbus_message_new_method_return(message)))
1105                         goto oom;
1106
1107                 /* We roll our own introspection code here, instead of
1108                  * relying on bus_default_message_handler() because we
1109                  * need to generate our introspection string
1110                  * dynamically. */
1111
1112                 if (!(f = open_memstream(&introspection, &size)))
1113                         goto oom;
1114
1115                 fputs(INTROSPECTION_BEGIN, f);
1116
1117                 HASHMAP_FOREACH(seat, m->seats, i) {
1118                         p = bus_path_escape(seat->id);
1119
1120                         if (p) {
1121                                 fprintf(f, "<node name=\"seat/%s\"/>", p);
1122                                 free(p);
1123                         }
1124                 }
1125
1126                 HASHMAP_FOREACH(user, m->users, i)
1127                         fprintf(f, "<node name=\"user/%llu\"/>", (unsigned long long) user->uid);
1128
1129                 HASHMAP_FOREACH(session, m->sessions, i) {
1130                         p = bus_path_escape(session->id);
1131
1132                         if (p) {
1133                                 fprintf(f, "<node name=\"session/%s\"/>", p);
1134                                 free(p);
1135                         }
1136                 }
1137
1138                 fputs(INTROSPECTION_END, f);
1139
1140                 if (ferror(f)) {
1141                         fclose(f);
1142                         free(introspection);
1143                         goto oom;
1144                 }
1145
1146                 fclose(f);
1147
1148                 if (!introspection)
1149                         goto oom;
1150
1151                 if (!dbus_message_append_args(reply, DBUS_TYPE_STRING, &introspection, DBUS_TYPE_INVALID)) {
1152                         free(introspection);
1153                         goto oom;
1154                 }
1155
1156                 free(introspection);
1157         } else
1158                 return bus_default_message_handler(connection, message, NULL, INTERFACES_LIST, properties);
1159
1160         if (reply) {
1161                 if (!dbus_connection_send(connection, reply, NULL))
1162                         goto oom;
1163
1164                 dbus_message_unref(reply);
1165         }
1166
1167         return DBUS_HANDLER_RESULT_HANDLED;
1168
1169 oom:
1170         if (reply)
1171                 dbus_message_unref(reply);
1172
1173         dbus_error_free(&error);
1174
1175         return DBUS_HANDLER_RESULT_NEED_MEMORY;
1176 }
1177
1178 const DBusObjectPathVTable bus_manager_vtable = {
1179         .message_function = manager_message_handler
1180 };
1181
1182 DBusHandlerResult bus_message_filter(
1183                 DBusConnection *connection,
1184                 DBusMessage *message,
1185                 void *userdata) {
1186
1187         Manager *m = userdata;
1188         DBusError error;
1189
1190         assert(m);
1191         assert(connection);
1192         assert(message);
1193
1194         dbus_error_init(&error);
1195
1196         if (dbus_message_is_signal(message, "org.freedesktop.systemd1.Agent", "Released")) {
1197                 const char *cgroup;
1198
1199                 if (!dbus_message_get_args(message, &error,
1200                                            DBUS_TYPE_STRING, &cgroup,
1201                                            DBUS_TYPE_INVALID))
1202                         log_error("Failed to parse Released message: %s", bus_error_message(&error));
1203                 else
1204                         manager_cgroup_notify_empty(m, cgroup);
1205         }
1206
1207         dbus_error_free(&error);
1208
1209         return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
1210 }
1211
1212 int manager_send_changed(Manager *manager, const char *properties) {
1213         DBusMessage *m;
1214         int r = -ENOMEM;
1215
1216         assert(manager);
1217
1218         m = bus_properties_changed_new("/org/freedesktop/login1", "org.freedesktop.login1.Manager", properties);
1219         if (!m)
1220                 goto finish;
1221
1222         if (!dbus_connection_send(manager->bus, m, NULL))
1223                 goto finish;
1224
1225         r = 0;
1226
1227 finish:
1228         if (m)
1229                 dbus_message_unref(m);
1230
1231         return r;
1232 }