src/cryptsetup/cryptsetup-generator.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include <errno.h>
   4 #include <fcntl.h>
   5 #include <sys/stat.h>
   6 #include <sys/types.h>
   7
   8 #include "alloc-util.h"
   9 #include "dropin.h"
  10 #include "escape.h"
  11 #include "fd-util.h"
  12 #include "fileio.h"
  13 #include "fstab-util.h"
  14 #include "generator.h"
  15 #include "hashmap.h"
  16 #include "id128-util.h"
  17 #include "log.h"
  18 #include "mkdir.h"
  19 #include "parse-util.h"
  20 #include "path-util.h"
  21 #include "proc-cmdline.h"
  22 #include "specifier.h"
  23 #include "string-util.h"
  24 #include "strv.h"
  25 #include "unit-name.h"
  26 #include "util.h"
  27
  28 typedef struct crypto_device {
  29         char *uuid;
  30         char *keyfile;
  31         char *keydev;
  32         char *name;
  33         char *options;
  34         bool create;
  35 } crypto_device;
  36
  37 static const char *arg_dest = NULL;
  38 static bool arg_enabled = true;
  39 static bool arg_read_crypttab = true;
  40 static const char *arg_crypttab = NULL;
  41 static const char *arg_runtime_directory = NULL;
  42 static bool arg_whitelist = false;
  43 static Hashmap *arg_disks = NULL;
  44 static char *arg_default_options = NULL;
  45 static char *arg_default_keyfile = NULL;
  46
  47 STATIC_DESTRUCTOR_REGISTER(arg_disks, hashmap_freep);
  48 STATIC_DESTRUCTOR_REGISTER(arg_default_options, freep);
  49 STATIC_DESTRUCTOR_REGISTER(arg_default_keyfile, freep);
  50
  51 static int split_keyspec(const char *keyspec, char **ret_keyfile, char **ret_keydev) {
  52         _cleanup_free_ char *keyfile = NULL, *keydev = NULL;
  53         const char *c;
  54
  55         assert(ret_keyfile);
  56         assert(ret_keydev);
  57
  58         if (!keyspec) {
  59                 *ret_keyfile = *ret_keydev = NULL;
  60                 return 0;
  61         }
  62
  63         c = strrchr(keyspec, ':');
  64         if (c) {
  65                 /* The keydev part has to be either an absolute path to device node (/dev/something,
  66                  * /dev/foo/something, or even possibly /dev/foo/something:part), or a fstab device
  67                  * specification starting with LABEL= or similar. The keyfile part has the same syntax.
  68                  *
  69                  * Let's try to guess if the second part looks like a keydev specification, or just part of a
  70                  * filename with a colon. fstab_node_to_udev_node() will convert the fstab device syntax to
  71                  * an absolute path. If we didn't get an absolute path, assume that it is just part of the
  72                  * first keyfile argument. */
  73
  74                 keydev = fstab_node_to_udev_node(c + 1);
  75                 if (!keydev)
  76                         return log_oom();
  77
  78                 if (path_is_absolute(keydev))
  79                         keyfile = strndup(keyspec, c-keyspec);
  80                 else {
  81                         log_debug("Keyspec argument contains a colon, but \"%s\" doesn't look like a device specification.\n"
  82                                   "Assuming that \"%s\" is a single device specification.",
  83                                   c + 1, keyspec);
  84                         keydev = mfree(keydev);
  85                         c = NULL;
  86                 }
  87         }
  88
  89         if (!c)
  90                 /* No keydev specified */
  91                 keyfile = strdup(keyspec);
  92
  93         if (!keyfile)
  94                 return log_oom();
  95
  96         *ret_keyfile = TAKE_PTR(keyfile);
  97         *ret_keydev = TAKE_PTR(keydev);
  98
  99         return 0;
 100 }
 101
 102 static int generate_keydev_mount(
 103                 const char *name,
 104                 const char *keydev,
 105                 const char *keydev_timeout,
 106                 bool canfail,
 107                 char **unit,
 108                 char **mount) {
 109
 110         _cleanup_free_ char *u = NULL, *where = NULL, *name_escaped = NULL, *device_unit = NULL;
 111         _cleanup_fclose_ FILE *f = NULL;
 112         int r;
 113         usec_t timeout_us;
 114
 115         assert(name);
 116         assert(keydev);
 117         assert(unit);
 118         assert(mount);
 119
 120         r = mkdir_parents(arg_runtime_directory, 0755);
 121         if (r < 0)
 122                 return r;
 123
 124         r = mkdir(arg_runtime_directory, 0700);
 125         if (r < 0 && errno != EEXIST)
 126                 return -errno;
 127
 128         name_escaped = cescape(name);
 129         if (!name_escaped)
 130                 return -ENOMEM;
 131
 132         where = strjoin(arg_runtime_directory, "/keydev-", name_escaped);
 133         if (!where)
 134                 return -ENOMEM;
 135
 136         r = mkdir(where, 0700);
 137         if (r < 0 && errno != EEXIST)
 138                 return -errno;
 139
 140         r = unit_name_from_path(where, ".mount", &u);
 141         if (r < 0)
 142                 return r;
 143
 144         r = generator_open_unit_file(arg_dest, NULL, u, &f);
 145         if (r < 0)
 146                 return r;
 147
 148         fprintf(f,
 149                 "[Unit]\n"
 150                 "DefaultDependencies=no\n\n"
 151                 "[Mount]\n"
 152                 "What=%s\n"
 153                 "Where=%s\n"
 154                 "Options=ro%s\n", keydev, where, canfail ? ",nofail" : "");
 155
 156         if (keydev_timeout) {
 157                 r = parse_sec_fix_0(keydev_timeout, &timeout_us);
 158                 if (r >= 0) {
 159                         r = unit_name_from_path(keydev, ".device", &device_unit);
 160                         if (r < 0)
 161                                 return log_error_errno(r, "Failed to generate unit name: %m");
 162
 163                         r = write_drop_in_format(arg_dest, device_unit, 90, "device-timeout",
 164                                 "# Automatically generated by systemd-cryptsetup-generator \n\n"
 165                                 "[Unit]\nJobRunningTimeoutSec=%s", keydev_timeout);
 166                         if (r < 0)
 167                                 return log_error_errno(r, "Failed to write device drop-in: %m");
 168
 169                 } else
 170                         log_warning_errno(r, "Failed to parse %s, ignoring: %m", keydev_timeout);
 171
 172         }
 173
 174         r = fflush_and_check(f);
 175         if (r < 0)
 176                 return r;
 177
 178         *unit = TAKE_PTR(u);
 179         *mount = TAKE_PTR(where);
 180
 181         return 0;
 182 }
 183
 184 static int print_dependencies(FILE *f, const char* device_path) {
 185         int r;
 186
 187         if (STR_IN_SET(device_path, "-", "none"))
 188                 /* None, nothing to do */
 189                 return 0;
 190
 191         if (PATH_IN_SET(device_path,
 192                         "/dev/urandom",
 193                         "/dev/random",
 194                         "/dev/hw_random",
 195                         "/dev/hwrng")) {
 196                 /* RNG device, add random dep */
 197                 fputs("After=systemd-random-seed.service\n", f);
 198                 return 0;
 199         }
 200
 201         _cleanup_free_ char *udev_node = fstab_node_to_udev_node(device_path);
 202         if (!udev_node)
 203                 return log_oom();
 204
 205         if (path_equal(udev_node, "/dev/null"))
 206                 return 0;
 207
 208         if (path_startswith(udev_node, "/dev/")) {
 209                 /* We are dealing with a block device, add dependency for corresponding unit */
 210                 _cleanup_free_ char *unit = NULL;
 211
 212                 r = unit_name_from_path(udev_node, ".device", &unit);
 213                 if (r < 0)
 214                         return log_error_errno(r, "Failed to generate unit name: %m");
 215
 216                 fprintf(f,
 217                         "After=%1$s\n"
 218                         "Requires=%1$s\n", unit);
 219         } else {
 220                 /* Regular file, add mount dependency */
 221                 _cleanup_free_ char *escaped_path = specifier_escape(device_path);
 222                 if (!escaped_path)
 223                         return log_oom();
 224
 225                 fprintf(f, "RequiresMountsFor=%s\n", escaped_path);
 226         }
 227
 228         return 0;
 229 }
 230
 231 static int create_disk(
 232                 const char *name,
 233                 const char *device,
 234                 const char *password,
 235                 const char *keydev,
 236                 const char *options) {
 237
 238         _cleanup_free_ char *n = NULL, *d = NULL, *u = NULL, *e = NULL,
 239                 *keydev_mount = NULL, *keyfile_timeout_value = NULL,
 240                 *filtered = NULL, *u_escaped = NULL, *name_escaped = NULL, *header_path = NULL, *password_buffer = NULL,
 241                 *tmp_fstype = NULL;
 242         _cleanup_fclose_ FILE *f = NULL;
 243         const char *dmname;
 244         bool noauto, nofail, swap, netdev, attach_in_initrd;
 245         int r, detached_header, keyfile_can_timeout, tmp;
 246
 247         assert(name);
 248         assert(device);
 249
 250         noauto = fstab_test_yes_no_option(options, "noauto\0" "auto\0");
 251         nofail = fstab_test_yes_no_option(options, "nofail\0" "fail\0");
 252         swap = fstab_test_option(options, "swap\0");
 253         netdev = fstab_test_option(options, "_netdev\0");
 254         attach_in_initrd = fstab_test_option(options, "x-initrd.attach\0");
 255
 256         keyfile_can_timeout = fstab_filter_options(options, "keyfile-timeout\0", NULL, &keyfile_timeout_value, NULL);
 257         if (keyfile_can_timeout < 0)
 258                 return log_error_errno(keyfile_can_timeout, "Failed to parse keyfile-timeout= option value: %m");
 259
 260         detached_header = fstab_filter_options(options, "header\0", NULL, &header_path, NULL);
 261         if (detached_header < 0)
 262                 return log_error_errno(detached_header, "Failed to parse header= option value: %m");
 263
 264         tmp = fstab_filter_options(options, "tmp\0", NULL, &tmp_fstype, NULL);
 265         if (tmp < 0)
 266                 return log_error_errno(tmp, "Failed to parse tmp= option value: %m");
 267
 268         if (tmp && swap)
 269                 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
 270                                        "Device '%s' cannot be both 'tmp' and 'swap'. Ignoring.",
 271                                        name);
 272
 273         name_escaped = specifier_escape(name);
 274         if (!name_escaped)
 275                 return log_oom();
 276
 277         e = unit_name_escape(name);
 278         if (!e)
 279                 return log_oom();
 280
 281         u = fstab_node_to_udev_node(device);
 282         if (!u)
 283                 return log_oom();
 284
 285         r = unit_name_build("systemd-cryptsetup", e, ".service", &n);
 286         if (r < 0)
 287                 return log_error_errno(r, "Failed to generate unit name: %m");
 288
 289         u_escaped = specifier_escape(u);
 290         if (!u_escaped)
 291                 return log_oom();
 292
 293         r = unit_name_from_path(u, ".device", &d);
 294         if (r < 0)
 295                 return log_error_errno(r, "Failed to generate unit name: %m");
 296
 297         if (keydev && !password)
 298                 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
 299                                        "Key device is specified, but path to the password file is missing.");
 300
 301         r = generator_open_unit_file(arg_dest, NULL, n, &f);
 302         if (r < 0)
 303                 return r;
 304
 305         r = generator_write_cryptsetup_unit_section(f, arg_crypttab);
 306         if (r < 0)
 307                 return r;
 308
 309         if (netdev)
 310                 fprintf(f, "After=remote-fs-pre.target\n");
 311
 312         /* If initrd takes care of attaching the disk then it should also detach it during shutdown. */
 313         if (!attach_in_initrd)
 314                 fprintf(f, "Conflicts=umount.target\n");
 315
 316         if (keydev) {
 317                 _cleanup_free_ char *unit = NULL;
 318
 319                 r = generate_keydev_mount(name, keydev, keyfile_timeout_value, keyfile_can_timeout > 0, &unit, &keydev_mount);
 320                 if (r < 0)
 321                         return log_error_errno(r, "Failed to generate keydev mount unit: %m");
 322
 323                 password_buffer = path_join(keydev_mount, password);
 324                 if (!password_buffer)
 325                         return log_oom();
 326
 327                 password = password_buffer;
 328
 329                 fprintf(f, "After=%s\n", unit);
 330                 if (keyfile_can_timeout > 0)
 331                         fprintf(f, "Wants=%s\n", unit);
 332                 else
 333                         fprintf(f, "Requires=%s\n", unit);
 334         }
 335
 336         if (!nofail)
 337                 fprintf(f,
 338                         "Before=%s\n",
 339                         netdev ? "remote-cryptsetup.target" : "cryptsetup.target");
 340
 341         if (password && !keydev) {
 342                 r = print_dependencies(f, password);
 343                 if (r < 0)
 344                         return r;
 345         }
 346
 347         /* Check if a header option was specified */
 348         if (detached_header > 0) {
 349                 r = print_dependencies(f, header_path);
 350                 if (r < 0)
 351                         return r;
 352         }
 353
 354         if (path_startswith(u, "/dev/"))
 355                 fprintf(f,
 356                         "BindsTo=%s\n"
 357                         "After=%s\n"
 358                         "Before=umount.target\n",
 359                         d, d);
 360         else
 361                 /* For loopback devices, add systemd-tmpfiles-setup-dev.service
 362                    dependency to ensure that loopback support is available in
 363                    the kernel (/dev/loop-control needs to exist) */
 364                 fprintf(f,
 365                         "RequiresMountsFor=%s\n"
 366                         "Requires=systemd-tmpfiles-setup-dev.service\n"
 367                         "After=systemd-tmpfiles-setup-dev.service\n",
 368                         u_escaped);
 369
 370         r = generator_write_timeouts(arg_dest, device, name, options, &filtered);
 371         if (r < 0)
 372                 log_warning_errno(r, "Failed to write device timeout drop-in: %m");
 373
 374         r = generator_write_cryptsetup_service_section(f, name, u, password, filtered);
 375         if (r < 0)
 376                 return r;
 377
 378         if (tmp) {
 379                 _cleanup_free_ char *tmp_fstype_escaped = NULL;
 380
 381                 if (tmp_fstype) {
 382                         tmp_fstype_escaped = specifier_escape(tmp_fstype);
 383                         if (!tmp_fstype_escaped)
 384                                 return log_oom();
 385                 }
 386
 387                 fprintf(f,
 388                         "ExecStartPost=" ROOTLIBEXECDIR "/systemd-makefs '%s' '/dev/mapper/%s'\n",
 389                         tmp_fstype_escaped ?: "ext4", name_escaped);
 390         }
 391
 392         if (swap)
 393                 fprintf(f,
 394                         "ExecStartPost=" ROOTLIBEXECDIR "/systemd-makefs swap '/dev/mapper/%s'\n",
 395                         name_escaped);
 396
 397         if (keydev)
 398                 fprintf(f,
 399                         "ExecStartPost=-" UMOUNT_PATH " %s\n\n",
 400                         keydev_mount);
 401
 402         r = fflush_and_check(f);
 403         if (r < 0)
 404                 return log_error_errno(r, "Failed to write unit file %s: %m", n);
 405
 406         if (!noauto) {
 407                 r = generator_add_symlink(arg_dest,
 408                                           netdev ? "remote-cryptsetup.target" : "cryptsetup.target",
 409                                           nofail ? "wants" : "requires", n);
 410                 if (r < 0)
 411                         return r;
 412         }
 413
 414         dmname = strjoina("dev-mapper-", e, ".device");
 415         r = generator_add_symlink(arg_dest, dmname, "requires", n);
 416         if (r < 0)
 417                 return r;
 418
 419         if (!noauto && !nofail) {
 420                 r = write_drop_in(arg_dest, dmname, 40, "device-timeout",
 421                                   "# Automatically generated by systemd-cryptsetup-generator\n\n"
 422                                   "[Unit]\nJobTimeoutSec=0");
 423                 if (r < 0)
 424                         log_warning_errno(r, "Failed to write device timeout drop-in: %m");
 425         }
 426
 427         return 0;
 428 }
 429
 430 static crypto_device* crypt_device_free(crypto_device *d) {
 431         if (!d)
 432                 return NULL;
 433
 434         free(d->uuid);
 435         free(d->keyfile);
 436         free(d->keydev);
 437         free(d->name);
 438         free(d->options);
 439         return mfree(d);
 440 }
 441
 442 static crypto_device *get_crypto_device(const char *uuid) {
 443         int r;
 444         crypto_device *d;
 445
 446         assert(uuid);
 447
 448         d = hashmap_get(arg_disks, uuid);
 449         if (!d) {
 450                 d = new0(struct crypto_device, 1);
 451                 if (!d)
 452                         return NULL;
 453
 454                 d->uuid = strdup(uuid);
 455                 if (!d->uuid)
 456                         return mfree(d);
 457
 458                 r = hashmap_put(arg_disks, d->uuid, d);
 459                 if (r < 0) {
 460                         free(d->uuid);
 461                         return mfree(d);
 462                 }
 463         }
 464
 465         return d;
 466 }
 467
 468 static int parse_proc_cmdline_item(const char *key, const char *value, void *data) {
 469         _cleanup_free_ char *uuid = NULL, *uuid_value = NULL;
 470         crypto_device *d;
 471         int r;
 472
 473         if (streq(key, "luks")) {
 474
 475                 r = value ? parse_boolean(value) : 1;
 476                 if (r < 0)
 477                         log_warning("Failed to parse luks= kernel command line switch %s. Ignoring.", value);
 478                 else
 479                         arg_enabled = r;
 480
 481         } else if (streq(key, "luks.crypttab")) {
 482
 483                 r = value ? parse_boolean(value) : 1;
 484                 if (r < 0)
 485                         log_warning("Failed to parse luks.crypttab= kernel command line switch %s. Ignoring.", value);
 486                 else
 487                         arg_read_crypttab = r;
 488
 489         } else if (streq(key, "luks.uuid")) {
 490
 491                 if (proc_cmdline_value_missing(key, value))
 492                         return 0;
 493
 494                 d = get_crypto_device(startswith(value, "luks-") ? value+5 : value);
 495                 if (!d)
 496                         return log_oom();
 497
 498                 d->create = arg_whitelist = true;
 499
 500         } else if (streq(key, "luks.options")) {
 501
 502                 if (proc_cmdline_value_missing(key, value))
 503                         return 0;
 504
 505                 r = sscanf(value, "%m[0-9a-fA-F-]=%ms", &uuid, &uuid_value);
 506                 if (r == 2) {
 507                         d = get_crypto_device(uuid);
 508                         if (!d)
 509                                 return log_oom();
 510
 511                         free_and_replace(d->options, uuid_value);
 512                 } else if (free_and_strdup(&arg_default_options, value) < 0)
 513                         return log_oom();
 514
 515         } else if (streq(key, "luks.key")) {
 516                 size_t n;
 517                 _cleanup_free_ char *keyfile = NULL, *keydev = NULL;
 518                 const char *keyspec;
 519
 520                 if (proc_cmdline_value_missing(key, value))
 521                         return 0;
 522
 523                 n = strspn(value, LETTERS DIGITS "-");
 524                 if (value[n] != '=') {
 525                         if (free_and_strdup(&arg_default_keyfile, value) < 0)
 526                                  return log_oom();
 527                         return 0;
 528                 }
 529
 530                 uuid = strndup(value, n);
 531                 if (!uuid)
 532                         return log_oom();
 533
 534                 if (!id128_is_valid(uuid)) {
 535                         log_warning("Failed to parse luks.key= kernel command line switch. UUID is invalid, ignoring.");
 536                         return 0;
 537                 }
 538
 539                 d = get_crypto_device(uuid);
 540                 if (!d)
 541                         return log_oom();
 542
 543                 keyspec = value + n + 1;
 544                 r = split_keyspec(keyspec, &keyfile, &keydev);
 545                 if (r < 0)
 546                         return r;
 547
 548                 free_and_replace(d->keyfile, keyfile);
 549                 free_and_replace(d->keydev, keydev);
 550
 551         } else if (streq(key, "luks.name")) {
 552
 553                 if (proc_cmdline_value_missing(key, value))
 554                         return 0;
 555
 556                 r = sscanf(value, "%m[0-9a-fA-F-]=%ms", &uuid, &uuid_value);
 557                 if (r == 2) {
 558                         d = get_crypto_device(uuid);
 559                         if (!d)
 560                                 return log_oom();
 561
 562                         d->create = arg_whitelist = true;
 563
 564                         free_and_replace(d->name, uuid_value);
 565                 } else
 566                         log_warning("Failed to parse luks name switch %s. Ignoring.", value);
 567         }
 568
 569         return 0;
 570 }
 571
 572 static int add_crypttab_devices(void) {
 573         _cleanup_fclose_ FILE *f = NULL;
 574         unsigned crypttab_line = 0;
 575         struct stat st;
 576         int r;
 577
 578         if (!arg_read_crypttab)
 579                 return 0;
 580
 581         r = fopen_unlocked(arg_crypttab, "re", &f);
 582         if (r < 0) {
 583                 if (errno != ENOENT)
 584                         log_error_errno(errno, "Failed to open %s: %m", arg_crypttab);
 585                 return 0;
 586         }
 587
 588         if (fstat(fileno(f), &st) < 0) {
 589                 log_error_errno(errno, "Failed to stat %s: %m", arg_crypttab);
 590                 return 0;
 591         }
 592
 593         for (;;) {
 594                 _cleanup_free_ char *line = NULL, *name = NULL, *device = NULL, *keyspec = NULL, *options = NULL, *keyfile = NULL, *keydev = NULL;
 595                 crypto_device *d = NULL;
 596                 char *l, *uuid;
 597                 int k;
 598
 599                 r = read_line(f, LONG_LINE_MAX, &line);
 600                 if (r < 0)
 601                         return log_error_errno(r, "Failed to read %s: %m", arg_crypttab);
 602                 if (r == 0)
 603                         break;
 604
 605                 crypttab_line++;
 606
 607                 l = strstrip(line);
 608                 if (IN_SET(l[0], 0, '#'))
 609                         continue;
 610
 611                 k = sscanf(l, "%ms %ms %ms %ms", &name, &device, &keyspec, &options);
 612                 if (k < 2 || k > 4) {
 613                         log_error("Failed to parse %s:%u, ignoring.", arg_crypttab, crypttab_line);
 614                         continue;
 615                 }
 616
 617                 uuid = startswith(device, "UUID=");
 618                 if (!uuid)
 619                         uuid = path_startswith(device, "/dev/disk/by-uuid/");
 620                 if (!uuid)
 621                         uuid = startswith(name, "luks-");
 622                 if (uuid)
 623                         d = hashmap_get(arg_disks, uuid);
 624
 625                 if (arg_whitelist && !d) {
 626                         log_info("Not creating device '%s' because it was not specified on the kernel command line.", name);
 627                         continue;
 628                 }
 629
 630                 r = split_keyspec(keyspec, &keyfile, &keydev);
 631                 if (r < 0)
 632                         return r;
 633
 634                 r = create_disk(name, device, keyfile, keydev, (d && d->options) ? d->options : options);
 635                 if (r < 0)
 636                         return r;
 637
 638                 if (d)
 639                         d->create = false;
 640         }
 641
 642         return 0;
 643 }
 644
 645 static int add_proc_cmdline_devices(void) {
 646         int r;
 647         Iterator i;
 648         crypto_device *d;
 649
 650         HASHMAP_FOREACH(d, arg_disks, i) {
 651                 _cleanup_free_ char *device = NULL;
 652
 653                 if (!d->create)
 654                         continue;
 655
 656                 if (!d->name) {
 657                         d->name = strjoin("luks-", d->uuid);
 658                         if (!d->name)
 659                                 return log_oom();
 660                 }
 661
 662                 device = strjoin("UUID=", d->uuid);
 663                 if (!device)
 664                         return log_oom();
 665
 666                 r = create_disk(d->name,
 667                                 device,
 668                                 d->keyfile ?: arg_default_keyfile,
 669                                 d->keydev,
 670                                 d->options ?: arg_default_options);
 671                 if (r < 0)
 672                         return r;
 673         }
 674
 675         return 0;
 676 }
 677
 678 DEFINE_PRIVATE_HASH_OPS_WITH_VALUE_DESTRUCTOR(crypt_device_hash_ops, char, string_hash_func, string_compare_func,
 679                                               crypto_device, crypt_device_free);
 680
 681 static int run(const char *dest, const char *dest_early, const char *dest_late) {
 682         int r;
 683
 684         assert_se(arg_dest = dest);
 685
 686         arg_crypttab = getenv("SYSTEMD_CRYPTTAB") ?: "/etc/crypttab";
 687         arg_runtime_directory = getenv("RUNTIME_DIRECTORY") ?: "/run/systemd/cryptsetup";
 688
 689         arg_disks = hashmap_new(&crypt_device_hash_ops);
 690         if (!arg_disks)
 691                 return log_oom();
 692
 693         r = proc_cmdline_parse(parse_proc_cmdline_item, NULL, PROC_CMDLINE_STRIP_RD_PREFIX);
 694         if (r < 0)
 695                 return log_warning_errno(r, "Failed to parse kernel command line: %m");
 696
 697         if (!arg_enabled)
 698                 return 0;
 699
 700         r = add_crypttab_devices();
 701         if (r < 0)
 702                 return r;
 703
 704         r = add_proc_cmdline_devices();
 705         if (r < 0)
 706                 return r;
 707
 708         return 0;
 709 }
 710
 711 DEFINE_MAIN_GENERATOR_FUNCTION(run);