src/login/logind-core.c

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