src/login/logind-user.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 Lesser General Public License as published by
  10   the Free Software Foundation; either version 2.1 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   Lesser General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <string.h>
  23 #include <unistd.h>
  24 #include <errno.h>
  25
  26 #include "util.h"
  27 #include "mkdir.h"
  28 #include "hashmap.h"
  29 #include "strv.h"
  30 #include "fileio.h"
  31 #include "special.h"
  32 #include "unit-name.h"
  33 #include "bus-util.h"
  34 #include "bus-error.h"
  35 #include "logind-user.h"
  36
  37 User* user_new(Manager *m, uid_t uid, gid_t gid, const char *name) {
  38         User *u;
  39
  40         assert(m);
  41         assert(name);
  42
  43         u = new0(User, 1);
  44         if (!u)
  45                 return NULL;
  46
  47         u->name = strdup(name);
  48         if (!u->name)
  49                 goto fail;
  50
  51         if (asprintf(&u->state_file, "/run/systemd/users/%lu", (unsigned long) uid) < 0)
  52                 goto fail;
  53
  54         if (hashmap_put(m->users, ULONG_TO_PTR((unsigned long) uid), u) < 0)
  55                 goto fail;
  56
  57         u->manager = m;
  58         u->uid = uid;
  59         u->gid = gid;
  60
  61         return u;
  62
  63 fail:
  64         free(u->state_file);
  65         free(u->name);
  66         free(u);
  67
  68         return NULL;
  69 }
  70
  71 void user_free(User *u) {
  72         assert(u);
  73
  74         if (u->in_gc_queue)
  75                 LIST_REMOVE(gc_queue, u->manager->user_gc_queue, u);
  76
  77         while (u->sessions)
  78                 session_free(u->sessions);
  79
  80         if (u->slice) {
  81                 hashmap_remove(u->manager->user_units, u->slice);
  82                 free(u->slice);
  83         }
  84
  85         if (u->service) {
  86                 hashmap_remove(u->manager->user_units, u->service);
  87                 free(u->service);
  88         }
  89
  90         free(u->slice_job);
  91         free(u->service_job);
  92
  93         free(u->runtime_path);
  94
  95         hashmap_remove(u->manager->users, ULONG_TO_PTR((unsigned long) u->uid));
  96
  97         free(u->name);
  98         free(u->state_file);
  99         free(u);
 100 }
 101
 102 int user_save(User *u) {
 103         _cleanup_free_ char *temp_path = NULL;
 104         _cleanup_fclose_ FILE *f = NULL;
 105         int r;
 106
 107         assert(u);
 108         assert(u->state_file);
 109
 110         if (!u->started)
 111                 return 0;
 112
 113         r = mkdir_safe_label("/run/systemd/users", 0755, 0, 0);
 114         if (r < 0)
 115                 goto finish;
 116
 117         r = fopen_temporary(u->state_file, &f, &temp_path);
 118         if (r < 0)
 119                 goto finish;
 120
 121         fchmod(fileno(f), 0644);
 122
 123         fprintf(f,
 124                 "# This is private data. Do not parse.\n"
 125                 "NAME=%s\n"
 126                 "STATE=%s\n",
 127                 u->name,
 128                 user_state_to_string(user_get_state(u)));
 129
 130         if (u->runtime_path)
 131                 fprintf(f, "RUNTIME=%s\n", u->runtime_path);
 132
 133         if (u->service)
 134                 fprintf(f, "SERVICE=%s\n", u->service);
 135         if (u->service_job)
 136                 fprintf(f, "SERVICE_JOB=%s\n", u->service_job);
 137
 138         if (u->slice)
 139                 fprintf(f, "SLICE=%s\n", u->slice);
 140         if (u->slice_job)
 141                 fprintf(f, "SLICE_JOB=%s\n", u->slice_job);
 142
 143         if (u->display)
 144                 fprintf(f, "DISPLAY=%s\n", u->display->id);
 145
 146         if (dual_timestamp_is_set(&u->timestamp))
 147                 fprintf(f,
 148                         "REALTIME="USEC_FMT"\n"
 149                         "MONOTONIC="USEC_FMT"\n",
 150                         u->timestamp.realtime,
 151                         u->timestamp.monotonic);
 152
 153         if (u->sessions) {
 154                 Session *i;
 155                 bool first;
 156
 157                 fputs("SESSIONS=", f);
 158                 first = true;
 159                 LIST_FOREACH(sessions_by_user, i, u->sessions) {
 160                         if (first)
 161                                 first = false;
 162                         else
 163                                 fputc(' ', f);
 164
 165                         fputs(i->id, f);
 166                 }
 167
 168                 fputs("\nSEATS=", f);
 169                 first = true;
 170                 LIST_FOREACH(sessions_by_user, i, u->sessions) {
 171                         if (!i->seat)
 172                                 continue;
 173
 174                         if (first)
 175                                 first = false;
 176                         else
 177                                 fputc(' ', f);
 178
 179                         fputs(i->seat->id, f);
 180                 }
 181
 182                 fputs("\nACTIVE_SESSIONS=", f);
 183                 first = true;
 184                 LIST_FOREACH(sessions_by_user, i, u->sessions) {
 185                         if (!session_is_active(i))
 186                                 continue;
 187
 188                         if (first)
 189                                 first = false;
 190                         else
 191                                 fputc(' ', f);
 192
 193                         fputs(i->id, f);
 194                 }
 195
 196                 fputs("\nONLINE_SESSIONS=", f);
 197                 first = true;
 198                 LIST_FOREACH(sessions_by_user, i, u->sessions) {
 199                         if (session_get_state(i) == SESSION_CLOSING)
 200                                 continue;
 201
 202                         if (first)
 203                                 first = false;
 204                         else
 205                                 fputc(' ', f);
 206
 207                         fputs(i->id, f);
 208                 }
 209
 210                 fputs("\nACTIVE_SEATS=", f);
 211                 first = true;
 212                 LIST_FOREACH(sessions_by_user, i, u->sessions) {
 213                         if (!session_is_active(i) || !i->seat)
 214                                 continue;
 215
 216                         if (first)
 217                                 first = false;
 218                         else
 219                                 fputc(' ', f);
 220
 221                         fputs(i->seat->id, f);
 222                 }
 223
 224                 fputs("\nONLINE_SEATS=", f);
 225                 first = true;
 226                 LIST_FOREACH(sessions_by_user, i, u->sessions) {
 227                         if (session_get_state(i) == SESSION_CLOSING || !i->seat)
 228                                 continue;
 229
 230                         if (first)
 231                                 first = false;
 232                         else
 233                                 fputc(' ', f);
 234
 235                         fputs(i->seat->id, f);
 236                 }
 237                 fputc('\n', f);
 238         }
 239
 240         fflush(f);
 241
 242         if (ferror(f) || rename(temp_path, u->state_file) < 0) {
 243                 r = -errno;
 244                 unlink(u->state_file);
 245                 unlink(temp_path);
 246         }
 247
 248 finish:
 249         if (r < 0)
 250                 log_error("Failed to save user data %s: %s", u->state_file, strerror(-r));
 251
 252         return r;
 253 }
 254
 255 int user_load(User *u) {
 256         _cleanup_free_ char *display = NULL, *realtime = NULL, *monotonic = NULL;
 257         Session *s = NULL;
 258         int r;
 259
 260         assert(u);
 261
 262         r = parse_env_file(u->state_file, NEWLINE,
 263                            "RUNTIME",     &u->runtime_path,
 264                            "SERVICE",     &u->service,
 265                            "SERVICE_JOB", &u->service_job,
 266                            "SLICE",       &u->slice,
 267                            "SLICE_JOB",   &u->slice_job,
 268                            "DISPLAY",     &display,
 269                            "REALTIME",    &realtime,
 270                            "MONOTONIC",   &monotonic,
 271                            NULL);
 272         if (r < 0) {
 273                 if (r == -ENOENT)
 274                         return 0;
 275
 276                 log_error("Failed to read %s: %s", u->state_file, strerror(-r));
 277                 return r;
 278         }
 279
 280         if (display)
 281                 s = hashmap_get(u->manager->sessions, display);
 282
 283         if (s && s->display && display_is_local(s->display))
 284                 u->display = s;
 285
 286         if (realtime) {
 287                 unsigned long long l;
 288                 if (sscanf(realtime, "%llu", &l) > 0)
 289                         u->timestamp.realtime = l;
 290         }
 291
 292         if (monotonic) {
 293                 unsigned long long l;
 294                 if (sscanf(monotonic, "%llu", &l) > 0)
 295                         u->timestamp.monotonic = l;
 296         }
 297
 298         return r;
 299 }
 300
 301 static int user_mkdir_runtime_path(User *u) {
 302         char *p;
 303         int r;
 304
 305         assert(u);
 306
 307         r = mkdir_safe_label("/run/user", 0755, 0, 0);
 308         if (r < 0) {
 309                 log_error("Failed to create /run/user: %s", strerror(-r));
 310                 return r;
 311         }
 312
 313         if (!u->runtime_path) {
 314                 if (asprintf(&p, "/run/user/%lu", (unsigned long) u->uid) < 0)
 315                         return log_oom();
 316         } else
 317                 p = u->runtime_path;
 318
 319         r = mkdir_safe_label(p, 0700, u->uid, u->gid);
 320         if (r < 0) {
 321                 log_error("Failed to create runtime directory %s: %s", p, strerror(-r));
 322                 free(p);
 323                 u->runtime_path = NULL;
 324                 return r;
 325         }
 326
 327         u->runtime_path = p;
 328         return 0;
 329 }
 330
 331 static int user_start_slice(User *u) {
 332         char *job;
 333         int r;
 334
 335         assert(u);
 336
 337         if (!u->slice) {
 338                 _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
 339                 char lu[DECIMAL_STR_MAX(unsigned long) + 1], *slice;
 340                 sprintf(lu, "%lu", (unsigned long) u->uid);
 341
 342                 r = build_subslice(SPECIAL_USER_SLICE, lu, &slice);
 343                 if (r < 0)
 344                         return r;
 345
 346                 r = manager_start_unit(u->manager, slice, &error, &job);
 347                 if (r < 0) {
 348                         log_error("Failed to start user slice: %s", bus_error_message(&error, r));
 349                         free(slice);
 350                 } else {
 351                         u->slice = slice;
 352
 353                         free(u->slice_job);
 354                         u->slice_job = job;
 355                 }
 356         }
 357
 358         if (u->slice)
 359                 hashmap_put(u->manager->user_units, u->slice, u);
 360
 361         return 0;
 362 }
 363
 364 static int user_start_service(User *u) {
 365         _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
 366         char *job;
 367         int r;
 368
 369         assert(u);
 370
 371         if (!u->service) {
 372                 char lu[DECIMAL_STR_MAX(unsigned long) + 1], *service;
 373                 sprintf(lu, "%lu", (unsigned long) u->uid);
 374
 375                 service = unit_name_build("user", lu, ".service");
 376                 if (!service)
 377                         return log_oom();
 378
 379                 r = manager_start_unit(u->manager, service, &error, &job);
 380                 if (r < 0) {
 381                         log_error("Failed to start user service: %s", bus_error_message(&error, r));
 382                         free(service);
 383                 } else {
 384                         u->service = service;
 385
 386                         free(u->service_job);
 387                         u->service_job = job;
 388                 }
 389         }
 390
 391         if (u->service)
 392                 hashmap_put(u->manager->user_units, u->service, u);
 393
 394         return 0;
 395 }
 396
 397 int user_start(User *u) {
 398         int r;
 399
 400         assert(u);
 401
 402         if (u->started)
 403                 return 0;
 404
 405         log_debug("New user %s logged in.", u->name);
 406
 407         /* Make XDG_RUNTIME_DIR */
 408         r = user_mkdir_runtime_path(u);
 409         if (r < 0)
 410                 return r;
 411
 412         /* Create cgroup */
 413         r = user_start_slice(u);
 414         if (r < 0)
 415                 return r;
 416
 417         /* Spawn user systemd */
 418         r = user_start_service(u);
 419         if (r < 0)
 420                 return r;
 421
 422         if (!dual_timestamp_is_set(&u->timestamp))
 423                 dual_timestamp_get(&u->timestamp);
 424
 425         u->started = true;
 426
 427         /* Save new user data */
 428         user_save(u);
 429
 430         user_send_signal(u, true);
 431
 432         return 0;
 433 }
 434
 435 static int user_stop_slice(User *u) {
 436         _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
 437         char *job;
 438         int r;
 439
 440         assert(u);
 441
 442         if (!u->slice)
 443                 return 0;
 444
 445         r = manager_stop_unit(u->manager, u->slice, &error, &job);
 446         if (r < 0) {
 447                 log_error("Failed to stop user slice: %s", bus_error_message(&error, r));
 448                 return r;
 449         }
 450
 451         free(u->slice_job);
 452         u->slice_job = job;
 453
 454         return r;
 455 }
 456
 457 static int user_stop_service(User *u) {
 458         _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
 459         char *job;
 460         int r;
 461
 462         assert(u);
 463
 464         if (!u->service)
 465                 return 0;
 466
 467         r = manager_stop_unit(u->manager, u->service, &error, &job);
 468         if (r < 0) {
 469                 log_error("Failed to stop user service: %s", bus_error_message(&error, r));
 470                 return r;
 471         }
 472
 473         free(u->service_job);
 474         u->service_job = job;
 475
 476         return r;
 477 }
 478
 479 static int user_remove_runtime_path(User *u) {
 480         int r;
 481
 482         assert(u);
 483
 484         if (!u->runtime_path)
 485                 return 0;
 486
 487         r = rm_rf(u->runtime_path, false, true, false);
 488         if (r < 0)
 489                 log_error("Failed to remove runtime directory %s: %s", u->runtime_path, strerror(-r));
 490
 491         free(u->runtime_path);
 492         u->runtime_path = NULL;
 493
 494         return r;
 495 }
 496
 497 int user_stop(User *u) {
 498         Session *s;
 499         int r = 0, k;
 500         assert(u);
 501
 502         LIST_FOREACH(sessions_by_user, s, u->sessions) {
 503                 k = session_stop(s);
 504                 if (k < 0)
 505                         r = k;
 506         }
 507
 508         /* Kill systemd */
 509         k = user_stop_service(u);
 510         if (k < 0)
 511                 r = k;
 512
 513         /* Kill cgroup */
 514         k = user_stop_slice(u);
 515         if (k < 0)
 516                 r = k;
 517
 518         u->stopping = true;
 519
 520         user_save(u);
 521
 522         return r;
 523 }
 524
 525 int user_finalize(User *u) {
 526         Session *s;
 527         int r = 0, k;
 528
 529         assert(u);
 530
 531         if (u->started)
 532                 log_debug("User %s logged out.", u->name);
 533
 534         LIST_FOREACH(sessions_by_user, s, u->sessions) {
 535                 k = session_finalize(s);
 536                 if (k < 0)
 537                         r = k;
 538         }
 539
 540         /* Kill XDG_RUNTIME_DIR */
 541         k = user_remove_runtime_path(u);
 542         if (k < 0)
 543                 r = k;
 544
 545         unlink(u->state_file);
 546         user_add_to_gc_queue(u);
 547
 548         if (u->started) {
 549                 user_send_signal(u, false);
 550                 u->started = false;
 551         }
 552
 553         return r;
 554 }
 555
 556 int user_get_idle_hint(User *u, dual_timestamp *t) {
 557         Session *s;
 558         bool idle_hint = true;
 559         dual_timestamp ts = { 0, 0 };
 560
 561         assert(u);
 562
 563         LIST_FOREACH(sessions_by_user, s, u->sessions) {
 564                 dual_timestamp k;
 565                 int ih;
 566
 567                 ih = session_get_idle_hint(s, &k);
 568                 if (ih < 0)
 569                         return ih;
 570
 571                 if (!ih) {
 572                         if (!idle_hint) {
 573                                 if (k.monotonic < ts.monotonic)
 574                                         ts = k;
 575                         } else {
 576                                 idle_hint = false;
 577                                 ts = k;
 578                         }
 579                 } else if (idle_hint) {
 580
 581                         if (k.monotonic > ts.monotonic)
 582                                 ts = k;
 583                 }
 584         }
 585
 586         if (t)
 587                 *t = ts;
 588
 589         return idle_hint;
 590 }
 591
 592 int user_check_linger_file(User *u) {
 593         _cleanup_free_ char *cc = NULL;
 594         char *p = NULL;
 595
 596         cc = cescape(u->name);
 597         if (!cc)
 598                 return -ENOMEM;
 599
 600         p = strappenda("/var/lib/systemd/linger/", cc);
 601
 602         return access(p, F_OK) >= 0;
 603 }
 604
 605 bool user_check_gc(User *u, bool drop_not_started) {
 606         assert(u);
 607
 608         if (drop_not_started && !u->started)
 609                 return false;
 610
 611         if (u->sessions)
 612                 return true;
 613
 614         if (user_check_linger_file(u) > 0)
 615                 return true;
 616
 617         if (u->slice_job && manager_job_is_active(u->manager, u->slice_job))
 618                 return true;
 619
 620         if (u->service_job && manager_job_is_active(u->manager, u->service_job))
 621                 return true;
 622
 623         return false;
 624 }
 625
 626 void user_add_to_gc_queue(User *u) {
 627         assert(u);
 628
 629         if (u->in_gc_queue)
 630                 return;
 631
 632         LIST_PREPEND(gc_queue, u->manager->user_gc_queue, u);
 633         u->in_gc_queue = true;
 634 }
 635
 636 UserState user_get_state(User *u) {
 637         Session *i;
 638
 639         assert(u);
 640
 641         if (u->stopping)
 642                 return USER_CLOSING;
 643
 644         if (u->slice_job || u->service_job)
 645                 return USER_OPENING;
 646
 647         if (u->sessions) {
 648                 bool all_closing = true;
 649
 650                 LIST_FOREACH(sessions_by_user, i, u->sessions) {
 651                         if (session_is_active(i))
 652                                 return USER_ACTIVE;
 653                         if (session_get_state(i) != SESSION_CLOSING)
 654                                 all_closing = false;
 655                 }
 656
 657                 return all_closing ? USER_CLOSING : USER_ONLINE;
 658         }
 659
 660         if (user_check_linger_file(u) > 0)
 661                 return USER_LINGERING;
 662
 663         return USER_CLOSING;
 664 }
 665
 666 int user_kill(User *u, int signo) {
 667         assert(u);
 668
 669         if (!u->slice)
 670                 return -ESRCH;
 671
 672         return manager_kill_unit(u->manager, u->slice, KILL_ALL, signo, NULL);
 673 }
 674
 675 static const char* const user_state_table[_USER_STATE_MAX] = {
 676         [USER_OFFLINE] = "offline",
 677         [USER_OPENING] = "opening",
 678         [USER_LINGERING] = "lingering",
 679         [USER_ONLINE] = "online",
 680         [USER_ACTIVE] = "active",
 681         [USER_CLOSING] = "closing"
 682 };
 683
 684 DEFINE_STRING_TABLE_LOOKUP(user_state, UserState);