src/login/logind-core.c

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