src/login/logind-core.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /***
   3   This file is part of systemd.
   4
   5   Copyright 2011 Lennart Poettering
   6 ***/
   7
   8 #include <fcntl.h>
   9 #include <pwd.h>
  10 #include <sys/ioctl.h>
  11 #include <sys/types.h>
  12 #include <linux/vt.h>
  13
  14 #include "alloc-util.h"
  15 #include "bus-error.h"
  16 #include "bus-util.h"
  17 #include "cgroup-util.h"
  18 #include "conf-parser.h"
  19 #include "fd-util.h"
  20 #include "logind.h"
  21 #include "parse-util.h"
  22 #include "process-util.h"
  23 #include "strv.h"
  24 #include "terminal-util.h"
  25 #include "udev-util.h"
  26 #include "user-util.h"
  27
  28 void manager_reset_config(Manager *m) {
  29         assert(m);
  30
  31         m->n_autovts = 6;
  32         m->reserve_vt = 6;
  33         m->remove_ipc = true;
  34         m->inhibit_delay_max = 5 * USEC_PER_SEC;
  35         m->handle_power_key = HANDLE_POWEROFF;
  36         m->handle_suspend_key = HANDLE_SUSPEND;
  37         m->handle_hibernate_key = HANDLE_HIBERNATE;
  38         m->handle_lid_switch = HANDLE_SUSPEND;
  39         m->handle_lid_switch_ep = _HANDLE_ACTION_INVALID;
  40         m->handle_lid_switch_docked = HANDLE_IGNORE;
  41         m->power_key_ignore_inhibited = false;
  42         m->suspend_key_ignore_inhibited = false;
  43         m->hibernate_key_ignore_inhibited = false;
  44         m->lid_switch_ignore_inhibited = true;
  45
  46         m->holdoff_timeout_usec = 30 * USEC_PER_SEC;
  47
  48         m->idle_action_usec = 30 * USEC_PER_MINUTE;
  49         m->idle_action = HANDLE_IGNORE;
  50
  51         m->runtime_dir_size = physical_memory_scale(10U, 100U); /* 10% */
  52         m->user_tasks_max = system_tasks_max_scale(DEFAULT_USER_TASKS_MAX_PERCENTAGE, 100U); /* 33% */
  53         m->sessions_max = 8192;
  54         m->inhibitors_max = 8192;
  55
  56         m->kill_user_processes = KILL_USER_PROCESSES;
  57
  58         m->kill_only_users = strv_free(m->kill_only_users);
  59         m->kill_exclude_users = strv_free(m->kill_exclude_users);
  60 }
  61
  62 int manager_parse_config_file(Manager *m) {
  63         assert(m);
  64
  65         return config_parse_many_nulstr(PKGSYSCONFDIR "/logind.conf",
  66                                         CONF_PATHS_NULSTR("systemd/logind.conf.d"),
  67                                         "Login\0",
  68                                         config_item_perf_lookup, logind_gperf_lookup,
  69                                         CONFIG_PARSE_WARN, m);
  70 }
  71
  72 int manager_add_device(Manager *m, const char *sysfs, bool master, Device **_device) {
  73         Device *d;
  74
  75         assert(m);
  76         assert(sysfs);
  77
  78         d = hashmap_get(m->devices, sysfs);
  79         if (d)
  80                 /* we support adding master-flags, but not removing them */
  81                 d->master = d->master || master;
  82         else {
  83                 d = device_new(m, sysfs, master);
  84                 if (!d)
  85                         return -ENOMEM;
  86         }
  87
  88         if (_device)
  89                 *_device = d;
  90
  91         return 0;
  92 }
  93
  94 int manager_add_seat(Manager *m, const char *id, Seat **_seat) {
  95         Seat *s;
  96
  97         assert(m);
  98         assert(id);
  99
 100         s = hashmap_get(m->seats, id);
 101         if (!s) {
 102                 s = seat_new(m, id);
 103                 if (!s)
 104                         return -ENOMEM;
 105         }
 106
 107         if (_seat)
 108                 *_seat = s;
 109
 110         return 0;
 111 }
 112
 113 int manager_add_session(Manager *m, const char *id, Session **_session) {
 114         Session *s;
 115
 116         assert(m);
 117         assert(id);
 118
 119         s = hashmap_get(m->sessions, id);
 120         if (!s) {
 121                 s = session_new(m, id);
 122                 if (!s)
 123                         return -ENOMEM;
 124         }
 125
 126         if (_session)
 127                 *_session = s;
 128
 129         return 0;
 130 }
 131
 132 int manager_add_user(Manager *m, uid_t uid, gid_t gid, const char *name, User **_user) {
 133         User *u;
 134         int r;
 135
 136         assert(m);
 137         assert(name);
 138
 139         u = hashmap_get(m->users, UID_TO_PTR(uid));
 140         if (!u) {
 141                 r = user_new(&u, m, uid, gid, name);
 142                 if (r < 0)
 143                         return r;
 144         }
 145
 146         if (_user)
 147                 *_user = u;
 148
 149         return 0;
 150 }
 151
 152 int manager_add_user_by_name(Manager *m, const char *name, User **_user) {
 153         uid_t uid;
 154         gid_t gid;
 155         int r;
 156
 157         assert(m);
 158         assert(name);
 159
 160         r = get_user_creds(&name, &uid, &gid, NULL, NULL);
 161         if (r < 0)
 162                 return r;
 163
 164         return manager_add_user(m, uid, gid, name, _user);
 165 }
 166
 167 int manager_add_user_by_uid(Manager *m, uid_t uid, User **_user) {
 168         struct passwd *p;
 169
 170         assert(m);
 171
 172         errno = 0;
 173         p = getpwuid(uid);
 174         if (!p)
 175                 return errno > 0 ? -errno : -ENOENT;
 176
 177         return manager_add_user(m, uid, p->pw_gid, p->pw_name, _user);
 178 }
 179
 180 int manager_add_inhibitor(Manager *m, const char* id, Inhibitor **_inhibitor) {
 181         Inhibitor *i;
 182
 183         assert(m);
 184         assert(id);
 185
 186         i = hashmap_get(m->inhibitors, id);
 187         if (i) {
 188                 if (_inhibitor)
 189                         *_inhibitor = i;
 190
 191                 return 0;
 192         }
 193
 194         i = inhibitor_new(m, id);
 195         if (!i)
 196                 return -ENOMEM;
 197
 198         if (_inhibitor)
 199                 *_inhibitor = i;
 200
 201         return 0;
 202 }
 203
 204 int manager_add_button(Manager *m, const char *name, Button **_button) {
 205         Button *b;
 206
 207         assert(m);
 208         assert(name);
 209
 210         b = hashmap_get(m->buttons, name);
 211         if (!b) {
 212                 b = button_new(m, name);
 213                 if (!b)
 214                         return -ENOMEM;
 215         }
 216
 217         if (_button)
 218                 *_button = b;
 219
 220         return 0;
 221 }
 222
 223 int manager_process_seat_device(Manager *m, struct udev_device *d) {
 224         Device *device;
 225         int r;
 226
 227         assert(m);
 228
 229         if (streq_ptr(udev_device_get_action(d), "remove")) {
 230
 231                 device = hashmap_get(m->devices, udev_device_get_syspath(d));
 232                 if (!device)
 233                         return 0;
 234
 235                 seat_add_to_gc_queue(device->seat);
 236                 device_free(device);
 237
 238         } else {
 239                 const char *sn;
 240                 Seat *seat = NULL;
 241                 bool master;
 242
 243                 sn = udev_device_get_property_value(d, "ID_SEAT");
 244                 if (isempty(sn))
 245                         sn = "seat0";
 246
 247                 if (!seat_name_is_valid(sn)) {
 248                         log_warning("Device with invalid seat name %s found, ignoring.", sn);
 249                         return 0;
 250                 }
 251
 252                 seat = hashmap_get(m->seats, sn);
 253                 master = udev_device_has_tag(d, "master-of-seat");
 254
 255                 /* Ignore non-master devices for unknown seats */
 256                 if (!master && !seat)
 257                         return 0;
 258
 259                 r = manager_add_device(m, udev_device_get_syspath(d), master, &device);
 260                 if (r < 0)
 261                         return r;
 262
 263                 if (!seat) {
 264                         r = manager_add_seat(m, sn, &seat);
 265                         if (r < 0) {
 266                                 if (!device->seat)
 267                                         device_free(device);
 268
 269                                 return r;
 270                         }
 271                 }
 272
 273                 device_attach(device, seat);
 274                 seat_start(seat);
 275         }
 276
 277         return 0;
 278 }
 279
 280 int manager_process_button_device(Manager *m, struct udev_device *d) {
 281         Button *b;
 282
 283         int r;
 284
 285         assert(m);
 286
 287         if (streq_ptr(udev_device_get_action(d), "remove")) {
 288
 289                 b = hashmap_get(m->buttons, udev_device_get_sysname(d));
 290                 if (!b)
 291                         return 0;
 292
 293                 button_free(b);
 294
 295         } else {
 296                 const char *sn;
 297
 298                 r = manager_add_button(m, udev_device_get_sysname(d), &b);
 299                 if (r < 0)
 300                         return r;
 301
 302                 sn = udev_device_get_property_value(d, "ID_SEAT");
 303                 if (isempty(sn))
 304                         sn = "seat0";
 305
 306                 button_set_seat(b, sn);
 307
 308                 r = button_open(b);
 309                 if (r < 0) /* event device doesn't have any keys or switches relevant to us? (or any other error
 310                             * opening the device?) let's close the button again. */
 311                         button_free(b);
 312         }
 313
 314         return 0;
 315 }
 316
 317 int manager_get_session_by_pid(Manager *m, pid_t pid, Session **ret) {
 318         _cleanup_free_ char *unit = NULL;
 319         Session *s;
 320         int r;
 321
 322         assert(m);
 323
 324         if (!pid_is_valid(pid))
 325                 return -EINVAL;
 326
 327         r = cg_pid_get_unit(pid, &unit);
 328         if (r < 0)
 329                 goto not_found;
 330
 331         s = hashmap_get(m->session_units, unit);
 332         if (!s)
 333                 goto not_found;
 334
 335         if (ret)
 336                 *ret = s;
 337
 338         return 1;
 339
 340 not_found:
 341         if (ret)
 342                 *ret = NULL;
 343         return 0;
 344 }
 345
 346 int manager_get_user_by_pid(Manager *m, pid_t pid, User **ret) {
 347         _cleanup_free_ char *unit = NULL;
 348         User *u;
 349         int r;
 350
 351         assert(m);
 352
 353         if (!pid_is_valid(pid))
 354                 return -EINVAL;
 355
 356         r = cg_pid_get_slice(pid, &unit);
 357         if (r < 0)
 358                 goto not_found;
 359
 360         u = hashmap_get(m->user_units, unit);
 361         if (!u)
 362                 goto not_found;
 363
 364         if (ret)
 365                 *ret = u;
 366
 367         return 1;
 368
 369 not_found:
 370         if (ret)
 371                 *ret = NULL;
 372
 373         return 0;
 374 }
 375
 376 int manager_get_idle_hint(Manager *m, dual_timestamp *t) {
 377         Session *s;
 378         bool idle_hint;
 379         dual_timestamp ts = DUAL_TIMESTAMP_NULL;
 380         Iterator i;
 381
 382         assert(m);
 383
 384         idle_hint = !manager_is_inhibited(m, INHIBIT_IDLE, INHIBIT_BLOCK, t, false, false, 0, NULL);
 385
 386         HASHMAP_FOREACH(s, m->sessions, i) {
 387                 dual_timestamp k;
 388                 int ih;
 389
 390                 ih = session_get_idle_hint(s, &k);
 391                 if (ih < 0)
 392                         return ih;
 393
 394                 if (!ih) {
 395                         if (!idle_hint) {
 396                                 if (k.monotonic < ts.monotonic)
 397                                         ts = k;
 398                         } else {
 399                                 idle_hint = false;
 400                                 ts = k;
 401                         }
 402                 } else if (idle_hint) {
 403
 404                         if (k.monotonic > ts.monotonic)
 405                                 ts = k;
 406                 }
 407         }
 408
 409         if (t)
 410                 *t = ts;
 411
 412         return idle_hint;
 413 }
 414
 415 bool manager_shall_kill(Manager *m, const char *user) {
 416         assert(m);
 417         assert(user);
 418
 419         if (!m->kill_exclude_users && streq(user, "root"))
 420                 return false;
 421
 422         if (strv_contains(m->kill_exclude_users, user))
 423                 return false;
 424
 425         if (!strv_isempty(m->kill_only_users))
 426                 return strv_contains(m->kill_only_users, user);
 427
 428         return m->kill_user_processes;
 429 }
 430
 431 int config_parse_n_autovts(
 432                 const char *unit,
 433                 const char *filename,
 434                 unsigned line,
 435                 const char *section,
 436                 unsigned section_line,
 437                 const char *lvalue,
 438                 int ltype,
 439                 const char *rvalue,
 440                 void *data,
 441                 void *userdata) {
 442
 443         unsigned *n = data;
 444         unsigned o;
 445         int r;
 446
 447         assert(filename);
 448         assert(lvalue);
 449         assert(rvalue);
 450         assert(data);
 451
 452         r = safe_atou(rvalue, &o);
 453         if (r < 0) {
 454                 log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse number of autovts, ignoring: %s", rvalue);
 455                 return 0;
 456         }
 457
 458         if (o > 15) {
 459                 log_syntax(unit, LOG_ERR, filename, line, r, "A maximum of 15 autovts are supported, ignoring: %s", rvalue);
 460                 return 0;
 461         }
 462
 463         *n = o;
 464         return 0;
 465 }
 466
 467 static int vt_is_busy(unsigned int vtnr) {
 468         struct vt_stat vt_stat;
 469         int r = 0;
 470         _cleanup_close_ int fd;
 471
 472         assert(vtnr >= 1);
 473
 474         /* VT_GETSTATE "cannot return state for more than 16 VTs, since v_state is short" */
 475         assert(vtnr <= 15);
 476
 477         /* We explicitly open /dev/tty1 here instead of /dev/tty0. If
 478          * we'd open the latter we'd open the foreground tty which
 479          * hence would be unconditionally busy. By opening /dev/tty1
 480          * we avoid this. Since tty1 is special and needs to be an
 481          * explicitly loaded getty or DM this is safe. */
 482
 483         fd = open_terminal("/dev/tty1", O_RDWR|O_NOCTTY|O_CLOEXEC);
 484         if (fd < 0)
 485                 return -errno;
 486
 487         if (ioctl(fd, VT_GETSTATE, &vt_stat) < 0)
 488                 r = -errno;
 489         else
 490                 r = !!(vt_stat.v_state & (1 << vtnr));
 491
 492         return r;
 493 }
 494
 495 int manager_spawn_autovt(Manager *m, unsigned int vtnr) {
 496         _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
 497         char name[sizeof("autovt@tty.service") + DECIMAL_STR_MAX(unsigned int)];
 498         int r;
 499
 500         assert(m);
 501         assert(vtnr >= 1);
 502
 503         if (vtnr > m->n_autovts &&
 504             vtnr != m->reserve_vt)
 505                 return 0;
 506
 507         if (vtnr != m->reserve_vt) {
 508                 /* If this is the reserved TTY, we'll start the getty
 509                  * on it in any case, but otherwise only if it is not
 510                  * busy. */
 511
 512                 r = vt_is_busy(vtnr);
 513                 if (r < 0)
 514                         return r;
 515                 else if (r > 0)
 516                         return -EBUSY;
 517         }
 518
 519         snprintf(name, sizeof(name), "autovt@tty%u.service", vtnr);
 520         r = sd_bus_call_method(
 521                         m->bus,
 522                         "org.freedesktop.systemd1",
 523                         "/org/freedesktop/systemd1",
 524                         "org.freedesktop.systemd1.Manager",
 525                         "StartUnit",
 526                         &error,
 527                         NULL,
 528                         "ss", name, "fail");
 529         if (r < 0)
 530                 log_error("Failed to start %s: %s", name, bus_error_message(&error, r));
 531
 532         return r;
 533 }
 534
 535 static bool manager_is_docked(Manager *m) {
 536         Iterator i;
 537         Button *b;
 538
 539         HASHMAP_FOREACH(b, m->buttons, i)
 540                 if (b->docked)
 541                         return true;
 542
 543         return false;
 544 }
 545
 546 static int manager_count_external_displays(Manager *m) {
 547         _cleanup_(udev_enumerate_unrefp) struct udev_enumerate *e = NULL;
 548         struct udev_list_entry *item = NULL, *first = NULL;
 549         int r;
 550         int n = 0;
 551
 552         e = udev_enumerate_new(m->udev);
 553         if (!e)
 554                 return -ENOMEM;
 555
 556         r = udev_enumerate_add_match_subsystem(e, "drm");
 557         if (r < 0)
 558                 return r;
 559
 560         r = udev_enumerate_scan_devices(e);
 561         if (r < 0)
 562                 return r;
 563
 564         first = udev_enumerate_get_list_entry(e);
 565         udev_list_entry_foreach(item, first) {
 566                 _cleanup_(udev_device_unrefp) struct udev_device *d = NULL;
 567                 struct udev_device *p;
 568                 const char *status, *enabled, *dash, *nn, *i;
 569                 bool external = false;
 570
 571                 d = udev_device_new_from_syspath(m->udev, udev_list_entry_get_name(item));
 572                 if (!d)
 573                         return -ENOMEM;
 574
 575                 p = udev_device_get_parent(d);
 576                 if (!p)
 577                         continue;
 578
 579                 /* If the parent shares the same subsystem as the
 580                  * device we are looking at then it is a connector,
 581                  * which is what we are interested in. */
 582                 if (!streq_ptr(udev_device_get_subsystem(p), "drm"))
 583                         continue;
 584
 585                 nn = udev_device_get_sysname(d);
 586                 if (!nn)
 587                         continue;
 588
 589                 /* Ignore internal displays: the type is encoded in
 590                  * the sysfs name, as the second dash separated item
 591                  * (the first is the card name, the last the connector
 592                  * number). We implement a whitelist of external
 593                  * displays here, rather than a whitelist, to ensure
 594                  * we don't block suspends too eagerly. */
 595                 dash = strchr(nn, '-');
 596                 if (!dash)
 597                         continue;
 598
 599                 dash++;
 600                 FOREACH_STRING(i, "VGA-", "DVI-I-", "DVI-D-", "DVI-A-"
 601                                "Composite-", "SVIDEO-", "Component-",
 602                                "DIN-", "DP-", "HDMI-A-", "HDMI-B-", "TV-") {
 603
 604                         if (startswith(dash, i)) {
 605                                 external = true;
 606                                 break;
 607                         }
 608                 }
 609                 if (!external)
 610                         continue;
 611
 612                 /* Ignore ports that are not enabled */
 613                 enabled = udev_device_get_sysattr_value(d, "enabled");
 614                 if (!enabled)
 615                         continue;
 616                 if (!streq_ptr(enabled, "enabled"))
 617                         continue;
 618
 619                 /* We count any connector which is not explicitly
 620                  * "disconnected" as connected. */
 621                 status = udev_device_get_sysattr_value(d, "status");
 622                 if (!streq_ptr(status, "disconnected"))
 623                         n++;
 624         }
 625
 626         return n;
 627 }
 628
 629 bool manager_is_docked_or_external_displays(Manager *m) {
 630         int n;
 631
 632         /* If we are docked don't react to lid closing */
 633         if (manager_is_docked(m)) {
 634                 log_debug("System is docked.");
 635                 return true;
 636         }
 637
 638         /* If we have more than one display connected,
 639          * assume that we are docked. */
 640         n = manager_count_external_displays(m);
 641         if (n < 0)
 642                 log_warning_errno(n, "Display counting failed: %m");
 643         else if (n >= 1) {
 644                 log_debug("External (%i) displays connected.", n);
 645                 return true;
 646         }
 647
 648         return false;
 649 }
 650
 651 bool manager_is_on_external_power(void) {
 652         int r;
 653
 654         /* For now we only check for AC power, but 'external power' can apply
 655          * to anything that isn't an internal battery */
 656         r = on_ac_power();
 657         if (r < 0)
 658                 log_warning_errno(r, "Failed to read AC power status: %m");
 659         else if (r > 0)
 660                 return true;
 661
 662         return false;
 663 }
 664
 665 bool manager_all_buttons_ignored(Manager *m) {
 666         assert(m);
 667
 668         if (m->handle_power_key != HANDLE_IGNORE)
 669                 return false;
 670         if (m->handle_suspend_key != HANDLE_IGNORE)
 671                 return false;
 672         if (m->handle_hibernate_key != HANDLE_IGNORE)
 673                 return false;
 674         if (m->handle_lid_switch != HANDLE_IGNORE)
 675                 return false;
 676         if (m->handle_lid_switch_ep != _HANDLE_ACTION_INVALID &&
 677             m->handle_lid_switch_ep != HANDLE_IGNORE)
 678                 return false;
 679         if (m->handle_lid_switch_docked != HANDLE_IGNORE)
 680                 return false;
 681
 682         return true;
 683 }