src/shared/condition.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include <errno.h>
   4 #include <fcntl.h>
   5 #include <fnmatch.h>
   6 #include <limits.h>
   7 #include <stdlib.h>
   8 #include <sys/types.h>
   9 #include <sys/utsname.h>
  10 #include <time.h>
  11 #include <unistd.h>
  12
  13 #include "sd-id128.h"
  14
  15 #include "alloc-util.h"
  16 #include "apparmor-util.h"
  17 #include "architecture.h"
  18 #include "audit-util.h"
  19 #include "cap-list.h"
  20 #include "cgroup-util.h"
  21 #include "condition.h"
  22 #include "cpu-set-util.h"
  23 #include "efi-loader.h"
  24 #include "env-file.h"
  25 #include "extract-word.h"
  26 #include "fd-util.h"
  27 #include "fileio.h"
  28 #include "fs-util.h"
  29 #include "glob-util.h"
  30 #include "hostname-util.h"
  31 #include "ima-util.h"
  32 #include "limits-util.h"
  33 #include "list.h"
  34 #include "macro.h"
  35 #include "mountpoint-util.h"
  36 #include "parse-util.h"
  37 #include "path-util.h"
  38 #include "proc-cmdline.h"
  39 #include "process-util.h"
  40 #include "selinux-util.h"
  41 #include "smack-util.h"
  42 #include "stat-util.h"
  43 #include "string-table.h"
  44 #include "string-util.h"
  45 #include "tomoyo-util.h"
  46 #include "user-record.h"
  47 #include "user-util.h"
  48 #include "util.h"
  49 #include "virt.h"
  50
  51 Condition* condition_new(ConditionType type, const char *parameter, bool trigger, bool negate) {
  52         Condition *c;
  53
  54         assert(type >= 0);
  55         assert(type < _CONDITION_TYPE_MAX);
  56         assert(parameter);
  57
  58         c = new(Condition, 1);
  59         if (!c)
  60                 return NULL;
  61
  62         *c = (Condition) {
  63                 .type = type,
  64                 .trigger = trigger,
  65                 .negate = negate,
  66         };
  67
  68         if (parameter) {
  69                 c->parameter = strdup(parameter);
  70                 if (!c->parameter)
  71                         return mfree(c);
  72         }
  73
  74         return c;
  75 }
  76
  77 Condition* condition_free(Condition *c) {
  78         assert(c);
  79
  80         free(c->parameter);
  81         return mfree(c);
  82 }
  83
  84 Condition* condition_free_list_type(Condition *head, ConditionType type) {
  85         Condition *c, *n;
  86
  87         LIST_FOREACH_SAFE(conditions, c, n, head)
  88                 if (type < 0 || c->type == type) {
  89                         LIST_REMOVE(conditions, head, c);
  90                         condition_free(c);
  91                 }
  92
  93         assert(type >= 0 || !head);
  94         return head;
  95 }
  96
  97 static int condition_test_kernel_command_line(Condition *c, char **env) {
  98         _cleanup_free_ char *line = NULL;
  99         const char *p;
 100         bool equal;
 101         int r;
 102
 103         assert(c);
 104         assert(c->parameter);
 105         assert(c->type == CONDITION_KERNEL_COMMAND_LINE);
 106
 107         r = proc_cmdline(&line);
 108         if (r < 0)
 109                 return r;
 110
 111         equal = strchr(c->parameter, '=');
 112
 113         for (p = line;;) {
 114                 _cleanup_free_ char *word = NULL;
 115                 bool found;
 116
 117                 r = extract_first_word(&p, &word, NULL, EXTRACT_UNQUOTE|EXTRACT_RELAX);
 118                 if (r < 0)
 119                         return r;
 120                 if (r == 0)
 121                         break;
 122
 123                 if (equal)
 124                         found = streq(word, c->parameter);
 125                 else {
 126                         const char *f;
 127
 128                         f = startswith(word, c->parameter);
 129                         found = f && IN_SET(*f, 0, '=');
 130                 }
 131
 132                 if (found)
 133                         return true;
 134         }
 135
 136         return false;
 137 }
 138
 139 typedef enum {
 140         /* Listed in order of checking. Note that some comparators are prefixes of others, hence the longest
 141          * should be listed first. */
 142         ORDER_LOWER_OR_EQUAL,
 143         ORDER_GREATER_OR_EQUAL,
 144         ORDER_LOWER,
 145         ORDER_GREATER,
 146         ORDER_EQUAL,
 147         ORDER_UNEQUAL,
 148         _ORDER_MAX,
 149         _ORDER_INVALID = -1
 150 } OrderOperator;
 151
 152 static OrderOperator parse_order(const char **s) {
 153
 154         static const char *const prefix[_ORDER_MAX] = {
 155                 [ORDER_LOWER_OR_EQUAL] = "<=",
 156                 [ORDER_GREATER_OR_EQUAL] = ">=",
 157                 [ORDER_LOWER] = "<",
 158                 [ORDER_GREATER] = ">",
 159                 [ORDER_EQUAL] = "=",
 160                 [ORDER_UNEQUAL] = "!=",
 161         };
 162
 163         OrderOperator i;
 164
 165         for (i = 0; i < _ORDER_MAX; i++) {
 166                 const char *e;
 167
 168                 e = startswith(*s, prefix[i]);
 169                 if (e) {
 170                         *s = e;
 171                         return i;
 172                 }
 173         }
 174
 175         return _ORDER_INVALID;
 176 }
 177
 178 static bool test_order(int k, OrderOperator p) {
 179
 180         switch (p) {
 181
 182         case ORDER_LOWER:
 183                 return k < 0;
 184
 185         case ORDER_LOWER_OR_EQUAL:
 186                 return k <= 0;
 187
 188         case ORDER_EQUAL:
 189                 return k == 0;
 190
 191         case ORDER_UNEQUAL:
 192                 return k != 0;
 193
 194         case ORDER_GREATER_OR_EQUAL:
 195                 return k >= 0;
 196
 197         case ORDER_GREATER:
 198                 return k > 0;
 199
 200         default:
 201                 assert_not_reached("unknown order");
 202
 203         }
 204 }
 205
 206 static int condition_test_kernel_version(Condition *c, char **env) {
 207         OrderOperator order;
 208         struct utsname u;
 209         const char *p;
 210         bool first = true;
 211
 212         assert(c);
 213         assert(c->parameter);
 214         assert(c->type == CONDITION_KERNEL_VERSION);
 215
 216         assert_se(uname(&u) >= 0);
 217
 218         p = c->parameter;
 219
 220         for (;;) {
 221                 _cleanup_free_ char *word = NULL;
 222                 const char *s;
 223                 int r;
 224
 225                 r = extract_first_word(&p, &word, NULL, EXTRACT_UNQUOTE);
 226                 if (r < 0)
 227                         return log_debug_errno(r, "Failed to parse condition string \"%s\": %m", p);
 228                 if (r == 0)
 229                         break;
 230
 231                 s = strstrip(word);
 232                 order = parse_order(&s);
 233                 if (order >= 0) {
 234                         s += strspn(s, WHITESPACE);
 235                         if (isempty(s)) {
 236                                 if (first) {
 237                                         /* For backwards compatibility, allow whitespace between the operator and
 238                                          * value, without quoting, but only in the first expression. */
 239                                         word = mfree(word);
 240                                         r = extract_first_word(&p, &word, NULL, 0);
 241                                         if (r < 0)
 242                                                 return log_debug_errno(r, "Failed to parse condition string \"%s\": %m", p);
 243                                         if (r == 0)
 244                                                 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "Unexpected end of expression: %s", p);
 245                                         s = word;
 246                                 } else
 247                                         return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "Unexpected end of expression: %s", p);
 248                         }
 249
 250                         r = test_order(str_verscmp(u.release, s), order);
 251                 } else
 252                         /* No prefix? Then treat as glob string */
 253                         r = fnmatch(s, u.release, 0) == 0;
 254
 255                 if (r == 0)
 256                         return false;
 257
 258                 first = false;
 259         }
 260
 261         return true;
 262 }
 263
 264 static int condition_test_memory(Condition *c, char **env) {
 265         OrderOperator order;
 266         uint64_t m, k;
 267         const char *p;
 268         int r;
 269
 270         assert(c);
 271         assert(c->parameter);
 272         assert(c->type == CONDITION_MEMORY);
 273
 274         m = physical_memory();
 275
 276         p = c->parameter;
 277         order = parse_order(&p);
 278         if (order < 0)
 279                 order = ORDER_GREATER_OR_EQUAL; /* default to >= check, if nothing is specified. */
 280
 281         r = safe_atou64(p, &k);
 282         if (r < 0)
 283                 return log_debug_errno(r, "Failed to parse size: %m");
 284
 285         return test_order(CMP(m, k), order);
 286 }
 287
 288 static int condition_test_cpus(Condition *c, char **env) {
 289         OrderOperator order;
 290         const char *p;
 291         unsigned k;
 292         int r, n;
 293
 294         assert(c);
 295         assert(c->parameter);
 296         assert(c->type == CONDITION_CPUS);
 297
 298         n = cpus_in_affinity_mask();
 299         if (n < 0)
 300                 return log_debug_errno(n, "Failed to determine CPUs in affinity mask: %m");
 301
 302         p = c->parameter;
 303         order = parse_order(&p);
 304         if (order < 0)
 305                 order = ORDER_GREATER_OR_EQUAL; /* default to >= check, if nothing is specified. */
 306
 307         r = safe_atou(p, &k);
 308         if (r < 0)
 309                 return log_debug_errno(r, "Failed to parse number of CPUs: %m");
 310
 311         return test_order(CMP((unsigned) n, k), order);
 312 }
 313
 314 static int condition_test_user(Condition *c, char **env) {
 315         uid_t id;
 316         int r;
 317         _cleanup_free_ char *username = NULL;
 318         const char *u;
 319
 320         assert(c);
 321         assert(c->parameter);
 322         assert(c->type == CONDITION_USER);
 323
 324         r = parse_uid(c->parameter, &id);
 325         if (r >= 0)
 326                 return id == getuid() || id == geteuid();
 327
 328         if (streq("@system", c->parameter))
 329                 return uid_is_system(getuid()) || uid_is_system(geteuid());
 330
 331         username = getusername_malloc();
 332         if (!username)
 333                 return -ENOMEM;
 334
 335         if (streq(username, c->parameter))
 336                 return 1;
 337
 338         if (getpid_cached() == 1)
 339                 return streq(c->parameter, "root");
 340
 341         u = c->parameter;
 342         r = get_user_creds(&u, &id, NULL, NULL, NULL, USER_CREDS_ALLOW_MISSING);
 343         if (r < 0)
 344                 return 0;
 345
 346         return id == getuid() || id == geteuid();
 347 }
 348
 349 static int condition_test_control_group_controller(Condition *c, char **env) {
 350         int r;
 351         CGroupMask system_mask, wanted_mask = 0;
 352
 353         assert(c);
 354         assert(c->parameter);
 355         assert(c->type == CONDITION_CONTROL_GROUP_CONTROLLER);
 356
 357         r = cg_mask_supported(&system_mask);
 358         if (r < 0)
 359                 return log_debug_errno(r, "Failed to determine supported controllers: %m");
 360
 361         r = cg_mask_from_string(c->parameter, &wanted_mask);
 362         if (r < 0 || wanted_mask <= 0) {
 363                 /* This won't catch the case that we have an unknown controller
 364                  * mixed in with valid ones -- these are only assessed on the
 365                  * validity of the valid controllers found. */
 366                 log_debug("Failed to parse cgroup string: %s", c->parameter);
 367                 return 1;
 368         }
 369
 370         return FLAGS_SET(system_mask, wanted_mask);
 371 }
 372
 373 static int condition_test_group(Condition *c, char **env) {
 374         gid_t id;
 375         int r;
 376
 377         assert(c);
 378         assert(c->parameter);
 379         assert(c->type == CONDITION_GROUP);
 380
 381         r = parse_gid(c->parameter, &id);
 382         if (r >= 0)
 383                 return in_gid(id);
 384
 385         /* Avoid any NSS lookups if we are PID1 */
 386         if (getpid_cached() == 1)
 387                 return streq(c->parameter, "root");
 388
 389         return in_group(c->parameter) > 0;
 390 }
 391
 392 static int condition_test_virtualization(Condition *c, char **env) {
 393         int b, v;
 394
 395         assert(c);
 396         assert(c->parameter);
 397         assert(c->type == CONDITION_VIRTUALIZATION);
 398
 399         if (streq(c->parameter, "private-users"))
 400                 return running_in_userns();
 401
 402         v = detect_virtualization();
 403         if (v < 0)
 404                 return v;
 405
 406         /* First, compare with yes/no */
 407         b = parse_boolean(c->parameter);
 408         if (b >= 0)
 409                 return b == !!v;
 410
 411         /* Then, compare categorization */
 412         if (streq(c->parameter, "vm"))
 413                 return VIRTUALIZATION_IS_VM(v);
 414
 415         if (streq(c->parameter, "container"))
 416                 return VIRTUALIZATION_IS_CONTAINER(v);
 417
 418         /* Finally compare id */
 419         return v != VIRTUALIZATION_NONE && streq(c->parameter, virtualization_to_string(v));
 420 }
 421
 422 static int condition_test_architecture(Condition *c, char **env) {
 423         int a, b;
 424
 425         assert(c);
 426         assert(c->parameter);
 427         assert(c->type == CONDITION_ARCHITECTURE);
 428
 429         a = uname_architecture();
 430         if (a < 0)
 431                 return a;
 432
 433         if (streq(c->parameter, "native"))
 434                 b = native_architecture();
 435         else {
 436                 b = architecture_from_string(c->parameter);
 437                 if (b < 0) /* unknown architecture? Then it's definitely not ours */
 438                         return false;
 439         }
 440
 441         return a == b;
 442 }
 443
 444 static int condition_test_host(Condition *c, char **env) {
 445         _cleanup_free_ char *h = NULL;
 446         sd_id128_t x, y;
 447         int r;
 448
 449         assert(c);
 450         assert(c->parameter);
 451         assert(c->type == CONDITION_HOST);
 452
 453         if (sd_id128_from_string(c->parameter, &x) >= 0) {
 454
 455                 r = sd_id128_get_machine(&y);
 456                 if (r < 0)
 457                         return r;
 458
 459                 return sd_id128_equal(x, y);
 460         }
 461
 462         h = gethostname_malloc();
 463         if (!h)
 464                 return -ENOMEM;
 465
 466         return fnmatch(c->parameter, h, FNM_CASEFOLD) == 0;
 467 }
 468
 469 static int condition_test_ac_power(Condition *c, char **env) {
 470         int r;
 471
 472         assert(c);
 473         assert(c->parameter);
 474         assert(c->type == CONDITION_AC_POWER);
 475
 476         r = parse_boolean(c->parameter);
 477         if (r < 0)
 478                 return r;
 479
 480         return (on_ac_power() != 0) == !!r;
 481 }
 482
 483 static int condition_test_security(Condition *c, char **env) {
 484         assert(c);
 485         assert(c->parameter);
 486         assert(c->type == CONDITION_SECURITY);
 487
 488         if (streq(c->parameter, "selinux"))
 489                 return mac_selinux_use();
 490         if (streq(c->parameter, "smack"))
 491                 return mac_smack_use();
 492         if (streq(c->parameter, "apparmor"))
 493                 return mac_apparmor_use();
 494         if (streq(c->parameter, "audit"))
 495                 return use_audit();
 496         if (streq(c->parameter, "ima"))
 497                 return use_ima();
 498         if (streq(c->parameter, "tomoyo"))
 499                 return mac_tomoyo_use();
 500         if (streq(c->parameter, "uefi-secureboot"))
 501                 return is_efi_secure_boot();
 502
 503         return false;
 504 }
 505
 506 static int condition_test_capability(Condition *c, char **env) {
 507         unsigned long long capabilities = (unsigned long long) -1;
 508         _cleanup_fclose_ FILE *f = NULL;
 509         int value, r;
 510
 511         assert(c);
 512         assert(c->parameter);
 513         assert(c->type == CONDITION_CAPABILITY);
 514
 515         /* If it's an invalid capability, we don't have it */
 516         value = capability_from_name(c->parameter);
 517         if (value < 0)
 518                 return -EINVAL;
 519
 520         /* If it's a valid capability we default to assume
 521          * that we have it */
 522
 523         f = fopen("/proc/self/status", "re");
 524         if (!f)
 525                 return -errno;
 526
 527         for (;;) {
 528                 _cleanup_free_ char *line = NULL;
 529                 const char *p;
 530
 531                 r = read_line(f, LONG_LINE_MAX, &line);
 532                 if (r < 0)
 533                         return r;
 534                 if (r == 0)
 535                         break;
 536
 537                 p = startswith(line, "CapBnd:");
 538                 if (p) {
 539                         if (sscanf(line+7, "%llx", &capabilities) != 1)
 540                                 return -EIO;
 541
 542                         break;
 543                 }
 544         }
 545
 546         return !!(capabilities & (1ULL << value));
 547 }
 548
 549 static int condition_test_needs_update(Condition *c, char **env) {
 550         struct stat usr, other;
 551         const char *p;
 552         bool b;
 553         int r;
 554
 555         assert(c);
 556         assert(c->parameter);
 557         assert(c->type == CONDITION_NEEDS_UPDATE);
 558
 559         r = proc_cmdline_get_bool("systemd.condition-needs-update", &b);
 560         if (r < 0)
 561                 log_debug_errno(r, "Failed to parse systemd.condition-needs-update= kernel command line argument, ignoring: %m");
 562         if (r > 0)
 563                 return b;
 564
 565         if (!path_is_absolute(c->parameter)) {
 566                 log_debug("Specified condition parameter '%s' is not absolute, assuming an update is needed.", c->parameter);
 567                 return true;
 568         }
 569
 570         /* If the file system is read-only we shouldn't suggest an update */
 571         r = path_is_read_only_fs(c->parameter);
 572         if (r < 0)
 573                 log_debug_errno(r, "Failed to determine if '%s' is read-only, ignoring: %m", c->parameter);
 574         if (r > 0)
 575                 return false;
 576
 577         /* Any other failure means we should allow the condition to be true, so that we rather invoke too
 578          * many update tools than too few. */
 579
 580         p = strjoina(c->parameter, "/.updated");
 581         if (lstat(p, &other) < 0) {
 582                 if (errno != ENOENT)
 583                         log_debug_errno(errno, "Failed to stat() '%s', assuming an update is needed: %m", p);
 584                 return true;
 585         }
 586
 587         if (lstat("/usr/", &usr) < 0) {
 588                 log_debug_errno(errno, "Failed to stat() /usr/, assuming an update is needed: %m");
 589                 return true;
 590         }
 591
 592         /*
 593          * First, compare seconds as they are always accurate...
 594          */
 595         if (usr.st_mtim.tv_sec != other.st_mtim.tv_sec)
 596                 return usr.st_mtim.tv_sec > other.st_mtim.tv_sec;
 597
 598         /*
 599          * ...then compare nanoseconds.
 600          *
 601          * A false positive is only possible when /usr's nanoseconds > 0
 602          * (otherwise /usr cannot be strictly newer than the target file)
 603          * AND the target file's nanoseconds == 0
 604          * (otherwise the filesystem supports nsec timestamps, see stat(2)).
 605          */
 606         if (usr.st_mtim.tv_nsec == 0 || other.st_mtim.tv_nsec > 0)
 607                 return usr.st_mtim.tv_nsec > other.st_mtim.tv_nsec;
 608
 609         _cleanup_free_ char *timestamp_str = NULL;
 610         r = parse_env_file(NULL, p, "TIMESTAMP_NSEC", &timestamp_str);
 611         if (r < 0) {
 612                 log_debug_errno(r, "Failed to parse timestamp file '%s', using mtime: %m", p);
 613                 return true;
 614         } else if (r == 0) {
 615                 log_debug("No data in timestamp file '%s', using mtime.", p);
 616                 return true;
 617         }
 618
 619         uint64_t timestamp;
 620         r = safe_atou64(timestamp_str, &timestamp);
 621         if (r < 0) {
 622                 log_debug_errno(r, "Failed to parse timestamp value '%s' in file '%s', using mtime: %m", timestamp_str, p);
 623                 return true;
 624         }
 625
 626         return timespec_load_nsec(&usr.st_mtim) > timestamp;
 627 }
 628
 629 static int condition_test_first_boot(Condition *c, char **env) {
 630         int r, q;
 631         bool b;
 632
 633         assert(c);
 634         assert(c->parameter);
 635         assert(c->type == CONDITION_FIRST_BOOT);
 636
 637         r = proc_cmdline_get_bool("systemd.condition-first-boot", &b);
 638         if (r < 0)
 639                 log_debug_errno(r, "Failed to parse systemd.condition-first-boot= kernel command line argument, ignoring: %m");
 640         if (r > 0)
 641                 return b == !!r;
 642
 643         r = parse_boolean(c->parameter);
 644         if (r < 0)
 645                 return r;
 646
 647         q = access("/run/systemd/first-boot", F_OK);
 648         if (q < 0 && errno != ENOENT)
 649                 log_debug_errno(errno, "Failed to check if /run/systemd/first-boot exists, ignoring: %m");
 650
 651         return (q >= 0) == !!r;
 652 }
 653
 654 static int condition_test_environment(Condition *c, char **env) {
 655         bool equal;
 656         char **i;
 657
 658         assert(c);
 659         assert(c->parameter);
 660         assert(c->type == CONDITION_ENVIRONMENT);
 661
 662         equal = strchr(c->parameter, '=');
 663
 664         STRV_FOREACH(i, env) {
 665                 bool found;
 666
 667                 if (equal)
 668                         found = streq(c->parameter, *i);
 669                 else {
 670                         const char *f;
 671
 672                         f = startswith(*i, c->parameter);
 673                         found = f && IN_SET(*f, 0, '=');
 674                 }
 675
 676                 if (found)
 677                         return true;
 678         }
 679
 680         return false;
 681 }
 682
 683 static int condition_test_path_exists(Condition *c, char **env) {
 684         assert(c);
 685         assert(c->parameter);
 686         assert(c->type == CONDITION_PATH_EXISTS);
 687
 688         return access(c->parameter, F_OK) >= 0;
 689 }
 690
 691 static int condition_test_path_exists_glob(Condition *c, char **env) {
 692         assert(c);
 693         assert(c->parameter);
 694         assert(c->type == CONDITION_PATH_EXISTS_GLOB);
 695
 696         return glob_exists(c->parameter) > 0;
 697 }
 698
 699 static int condition_test_path_is_directory(Condition *c, char **env) {
 700         assert(c);
 701         assert(c->parameter);
 702         assert(c->type == CONDITION_PATH_IS_DIRECTORY);
 703
 704         return is_dir(c->parameter, true) > 0;
 705 }
 706
 707 static int condition_test_path_is_symbolic_link(Condition *c, char **env) {
 708         assert(c);
 709         assert(c->parameter);
 710         assert(c->type == CONDITION_PATH_IS_SYMBOLIC_LINK);
 711
 712         return is_symlink(c->parameter) > 0;
 713 }
 714
 715 static int condition_test_path_is_mount_point(Condition *c, char **env) {
 716         assert(c);
 717         assert(c->parameter);
 718         assert(c->type == CONDITION_PATH_IS_MOUNT_POINT);
 719
 720         return path_is_mount_point(c->parameter, NULL, AT_SYMLINK_FOLLOW) > 0;
 721 }
 722
 723 static int condition_test_path_is_read_write(Condition *c, char **env) {
 724         assert(c);
 725         assert(c->parameter);
 726         assert(c->type == CONDITION_PATH_IS_READ_WRITE);
 727
 728         return path_is_read_only_fs(c->parameter) <= 0;
 729 }
 730
 731 static int condition_test_path_is_encrypted(Condition *c, char **env) {
 732         int r;
 733
 734         assert(c);
 735         assert(c->parameter);
 736         assert(c->type == CONDITION_PATH_IS_ENCRYPTED);
 737
 738         r = path_is_encrypted(c->parameter);
 739         if (r < 0 && r != -ENOENT)
 740                 log_debug_errno(r, "Failed to determine if '%s' is encrypted: %m", c->parameter);
 741
 742         return r > 0;
 743 }
 744
 745 static int condition_test_directory_not_empty(Condition *c, char **env) {
 746         int r;
 747
 748         assert(c);
 749         assert(c->parameter);
 750         assert(c->type == CONDITION_DIRECTORY_NOT_EMPTY);
 751
 752         r = dir_is_empty(c->parameter);
 753         return r <= 0 && r != -ENOENT;
 754 }
 755
 756 static int condition_test_file_not_empty(Condition *c, char **env) {
 757         struct stat st;
 758
 759         assert(c);
 760         assert(c->parameter);
 761         assert(c->type == CONDITION_FILE_NOT_EMPTY);
 762
 763         return (stat(c->parameter, &st) >= 0 &&
 764                 S_ISREG(st.st_mode) &&
 765                 st.st_size > 0);
 766 }
 767
 768 static int condition_test_file_is_executable(Condition *c, char **env) {
 769         struct stat st;
 770
 771         assert(c);
 772         assert(c->parameter);
 773         assert(c->type == CONDITION_FILE_IS_EXECUTABLE);
 774
 775         return (stat(c->parameter, &st) >= 0 &&
 776                 S_ISREG(st.st_mode) &&
 777                 (st.st_mode & 0111));
 778 }
 779
 780 int condition_test(Condition *c, char **env) {
 781
 782         static int (*const condition_tests[_CONDITION_TYPE_MAX])(Condition *c, char **env) = {
 783                 [CONDITION_PATH_EXISTS]              = condition_test_path_exists,
 784                 [CONDITION_PATH_EXISTS_GLOB]         = condition_test_path_exists_glob,
 785                 [CONDITION_PATH_IS_DIRECTORY]        = condition_test_path_is_directory,
 786                 [CONDITION_PATH_IS_SYMBOLIC_LINK]    = condition_test_path_is_symbolic_link,
 787                 [CONDITION_PATH_IS_MOUNT_POINT]      = condition_test_path_is_mount_point,
 788                 [CONDITION_PATH_IS_READ_WRITE]       = condition_test_path_is_read_write,
 789                 [CONDITION_PATH_IS_ENCRYPTED]        = condition_test_path_is_encrypted,
 790                 [CONDITION_DIRECTORY_NOT_EMPTY]      = condition_test_directory_not_empty,
 791                 [CONDITION_FILE_NOT_EMPTY]           = condition_test_file_not_empty,
 792                 [CONDITION_FILE_IS_EXECUTABLE]       = condition_test_file_is_executable,
 793                 [CONDITION_KERNEL_COMMAND_LINE]      = condition_test_kernel_command_line,
 794                 [CONDITION_KERNEL_VERSION]           = condition_test_kernel_version,
 795                 [CONDITION_VIRTUALIZATION]           = condition_test_virtualization,
 796                 [CONDITION_SECURITY]                 = condition_test_security,
 797                 [CONDITION_CAPABILITY]               = condition_test_capability,
 798                 [CONDITION_HOST]                     = condition_test_host,
 799                 [CONDITION_AC_POWER]                 = condition_test_ac_power,
 800                 [CONDITION_ARCHITECTURE]             = condition_test_architecture,
 801                 [CONDITION_NEEDS_UPDATE]             = condition_test_needs_update,
 802                 [CONDITION_FIRST_BOOT]               = condition_test_first_boot,
 803                 [CONDITION_USER]                     = condition_test_user,
 804                 [CONDITION_GROUP]                    = condition_test_group,
 805                 [CONDITION_CONTROL_GROUP_CONTROLLER] = condition_test_control_group_controller,
 806                 [CONDITION_CPUS]                     = condition_test_cpus,
 807                 [CONDITION_MEMORY]                   = condition_test_memory,
 808                 [CONDITION_ENVIRONMENT]              = condition_test_environment,
 809         };
 810
 811         int r, b;
 812
 813         assert(c);
 814         assert(c->type >= 0);
 815         assert(c->type < _CONDITION_TYPE_MAX);
 816
 817         r = condition_tests[c->type](c, env);
 818         if (r < 0) {
 819                 c->result = CONDITION_ERROR;
 820                 return r;
 821         }
 822
 823         b = (r > 0) == !c->negate;
 824         c->result = b ? CONDITION_SUCCEEDED : CONDITION_FAILED;
 825         return b;
 826 }
 827
 828 bool condition_test_list(
 829                 Condition *first,
 830                 char **env,
 831                 condition_to_string_t to_string,
 832                 condition_test_logger_t logger,
 833                 void *userdata) {
 834
 835         Condition *c;
 836         int triggered = -1;
 837
 838         assert(!!logger == !!to_string);
 839
 840         /* If the condition list is empty, then it is true */
 841         if (!first)
 842                 return true;
 843
 844         /* Otherwise, if all of the non-trigger conditions apply and
 845          * if any of the trigger conditions apply (unless there are
 846          * none) we return true */
 847         LIST_FOREACH(conditions, c, first) {
 848                 int r;
 849
 850                 r = condition_test(c, env);
 851
 852                 if (logger) {
 853                         if (r < 0)
 854                                 logger(userdata, LOG_WARNING, r, PROJECT_FILE, __LINE__, __func__,
 855                                        "Couldn't determine result for %s=%s%s%s, assuming failed: %m",
 856                                        to_string(c->type),
 857                                        c->trigger ? "|" : "",
 858                                        c->negate ? "!" : "",
 859                                        c->parameter);
 860                         else
 861                                 logger(userdata, LOG_DEBUG, 0, PROJECT_FILE, __LINE__, __func__,
 862                                        "%s=%s%s%s %s.",
 863                                        to_string(c->type),
 864                                        c->trigger ? "|" : "",
 865                                        c->negate ? "!" : "",
 866                                        c->parameter,
 867                                        condition_result_to_string(c->result));
 868                 }
 869
 870                 if (!c->trigger && r <= 0)
 871                         return false;
 872
 873                 if (c->trigger && triggered <= 0)
 874                         triggered = r > 0;
 875         }
 876
 877         return triggered != 0;
 878 }
 879
 880 void condition_dump(Condition *c, FILE *f, const char *prefix, condition_to_string_t to_string) {
 881         assert(c);
 882         assert(f);
 883         assert(to_string);
 884
 885         prefix = strempty(prefix);
 886
 887         fprintf(f,
 888                 "%s\t%s: %s%s%s %s\n",
 889                 prefix,
 890                 to_string(c->type),
 891                 c->trigger ? "|" : "",
 892                 c->negate ? "!" : "",
 893                 c->parameter,
 894                 condition_result_to_string(c->result));
 895 }
 896
 897 void condition_dump_list(Condition *first, FILE *f, const char *prefix, condition_to_string_t to_string) {
 898         Condition *c;
 899
 900         LIST_FOREACH(conditions, c, first)
 901                 condition_dump(c, f, prefix, to_string);
 902 }
 903
 904 static const char* const condition_type_table[_CONDITION_TYPE_MAX] = {
 905         [CONDITION_ARCHITECTURE] = "ConditionArchitecture",
 906         [CONDITION_VIRTUALIZATION] = "ConditionVirtualization",
 907         [CONDITION_HOST] = "ConditionHost",
 908         [CONDITION_KERNEL_COMMAND_LINE] = "ConditionKernelCommandLine",
 909         [CONDITION_KERNEL_VERSION] = "ConditionKernelVersion",
 910         [CONDITION_SECURITY] = "ConditionSecurity",
 911         [CONDITION_CAPABILITY] = "ConditionCapability",
 912         [CONDITION_AC_POWER] = "ConditionACPower",
 913         [CONDITION_NEEDS_UPDATE] = "ConditionNeedsUpdate",
 914         [CONDITION_FIRST_BOOT] = "ConditionFirstBoot",
 915         [CONDITION_PATH_EXISTS] = "ConditionPathExists",
 916         [CONDITION_PATH_EXISTS_GLOB] = "ConditionPathExistsGlob",
 917         [CONDITION_PATH_IS_DIRECTORY] = "ConditionPathIsDirectory",
 918         [CONDITION_PATH_IS_SYMBOLIC_LINK] = "ConditionPathIsSymbolicLink",
 919         [CONDITION_PATH_IS_MOUNT_POINT] = "ConditionPathIsMountPoint",
 920         [CONDITION_PATH_IS_READ_WRITE] = "ConditionPathIsReadWrite",
 921         [CONDITION_PATH_IS_ENCRYPTED] = "ConditionPathIsEncrypted",
 922         [CONDITION_DIRECTORY_NOT_EMPTY] = "ConditionDirectoryNotEmpty",
 923         [CONDITION_FILE_NOT_EMPTY] = "ConditionFileNotEmpty",
 924         [CONDITION_FILE_IS_EXECUTABLE] = "ConditionFileIsExecutable",
 925         [CONDITION_USER] = "ConditionUser",
 926         [CONDITION_GROUP] = "ConditionGroup",
 927         [CONDITION_CONTROL_GROUP_CONTROLLER] = "ConditionControlGroupController",
 928         [CONDITION_CPUS] = "ConditionCPUs",
 929         [CONDITION_MEMORY] = "ConditionMemory",
 930         [CONDITION_ENVIRONMENT] = "ConditionEnvironment",
 931 };
 932
 933 DEFINE_STRING_TABLE_LOOKUP(condition_type, ConditionType);
 934
 935 static const char* const assert_type_table[_CONDITION_TYPE_MAX] = {
 936         [CONDITION_ARCHITECTURE] = "AssertArchitecture",
 937         [CONDITION_VIRTUALIZATION] = "AssertVirtualization",
 938         [CONDITION_HOST] = "AssertHost",
 939         [CONDITION_KERNEL_COMMAND_LINE] = "AssertKernelCommandLine",
 940         [CONDITION_KERNEL_VERSION] = "AssertKernelVersion",
 941         [CONDITION_SECURITY] = "AssertSecurity",
 942         [CONDITION_CAPABILITY] = "AssertCapability",
 943         [CONDITION_AC_POWER] = "AssertACPower",
 944         [CONDITION_NEEDS_UPDATE] = "AssertNeedsUpdate",
 945         [CONDITION_FIRST_BOOT] = "AssertFirstBoot",
 946         [CONDITION_PATH_EXISTS] = "AssertPathExists",
 947         [CONDITION_PATH_EXISTS_GLOB] = "AssertPathExistsGlob",
 948         [CONDITION_PATH_IS_DIRECTORY] = "AssertPathIsDirectory",
 949         [CONDITION_PATH_IS_SYMBOLIC_LINK] = "AssertPathIsSymbolicLink",
 950         [CONDITION_PATH_IS_MOUNT_POINT] = "AssertPathIsMountPoint",
 951         [CONDITION_PATH_IS_READ_WRITE] = "AssertPathIsReadWrite",
 952         [CONDITION_PATH_IS_ENCRYPTED] = "AssertPathIsEncrypted",
 953         [CONDITION_DIRECTORY_NOT_EMPTY] = "AssertDirectoryNotEmpty",
 954         [CONDITION_FILE_NOT_EMPTY] = "AssertFileNotEmpty",
 955         [CONDITION_FILE_IS_EXECUTABLE] = "AssertFileIsExecutable",
 956         [CONDITION_USER] = "AssertUser",
 957         [CONDITION_GROUP] = "AssertGroup",
 958         [CONDITION_CONTROL_GROUP_CONTROLLER] = "AssertControlGroupController",
 959         [CONDITION_CPUS] = "AssertCPUs",
 960         [CONDITION_MEMORY] = "AssertMemory",
 961         [CONDITION_ENVIRONMENT] = "AssertEnvironment",
 962 };
 963
 964 DEFINE_STRING_TABLE_LOOKUP(assert_type, ConditionType);
 965
 966 static const char* const condition_result_table[_CONDITION_RESULT_MAX] = {
 967         [CONDITION_UNTESTED] = "untested",
 968         [CONDITION_SUCCEEDED] = "succeeded",
 969         [CONDITION_FAILED] = "failed",
 970         [CONDITION_ERROR] = "error",
 971 };
 972
 973 DEFINE_STRING_TABLE_LOOKUP(condition_result, ConditionResult);