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_allow_list = 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_device_mount(
 103                 const char *name,
 104                 const char *device,
 105                 const char *type_prefix, /* "keydev" or "headerdev" */
 106                 const char *device_timeout,
 107                 bool canfail,
 108                 bool readonly,
 109                 char **unit,
 110                 char **mount) {
 111
 112         _cleanup_free_ char *u = NULL, *where = NULL, *name_escaped = NULL, *device_unit = NULL;
 113         _cleanup_fclose_ FILE *f = NULL;
 114         int r;
 115         usec_t timeout_us;
 116
 117         assert(name);
 118         assert(device);
 119         assert(unit);
 120         assert(mount);
 121
 122         r = mkdir_parents(arg_runtime_directory, 0755);
 123         if (r < 0)
 124                 return r;
 125
 126         r = mkdir(arg_runtime_directory, 0700);
 127         if (r < 0 && errno != EEXIST)
 128                 return -errno;
 129
 130         name_escaped = cescape(name);
 131         if (!name_escaped)
 132                 return -ENOMEM;
 133
 134         where = strjoin(arg_runtime_directory, "/", type_prefix, "-", name_escaped);
 135         if (!where)
 136                 return -ENOMEM;
 137
 138         r = mkdir(where, 0700);
 139         if (r < 0 && errno != EEXIST)
 140                 return -errno;
 141
 142         r = unit_name_from_path(where, ".mount", &u);
 143         if (r < 0)
 144                 return r;
 145
 146         r = generator_open_unit_file(arg_dest, NULL, u, &f);
 147         if (r < 0)
 148                 return r;
 149
 150         fprintf(f,
 151                 "[Unit]\n"
 152                 "DefaultDependencies=no\n\n"
 153                 "[Mount]\n"
 154                 "What=%s\n"
 155                 "Where=%s\n"
 156                 "Options=%s%s\n", device, where, readonly ? "ro" : "rw", canfail ? ",nofail" : "");
 157
 158         if (device_timeout) {
 159                 r = parse_sec_fix_0(device_timeout, &timeout_us);
 160                 if (r >= 0) {
 161                         r = unit_name_from_path(device, ".device", &device_unit);
 162                         if (r < 0)
 163                                 return log_error_errno(r, "Failed to generate unit name: %m");
 164
 165                         r = write_drop_in_format(arg_dest, device_unit, 90, "device-timeout",
 166                                 "# Automatically generated by systemd-cryptsetup-generator \n\n"
 167                                 "[Unit]\nJobRunningTimeoutSec=%s", device_timeout);
 168                         if (r < 0)
 169                                 return log_error_errno(r, "Failed to write device drop-in: %m");
 170
 171                 } else
 172                         log_warning_errno(r, "Failed to parse %s, ignoring: %m", device_timeout);
 173
 174         }
 175
 176         r = fflush_and_check(f);
 177         if (r < 0)
 178                 return r;
 179
 180         *unit = TAKE_PTR(u);
 181         *mount = TAKE_PTR(where);
 182
 183         return 0;
 184 }
 185
 186 static int generate_device_umount(const char *name,
 187                                   const char *device_mount,
 188                                   const char *type_prefix, /* "keydev" or "headerdev" */
 189                                   char **ret_umount_unit) {
 190         _cleanup_fclose_ FILE *f = NULL;
 191         _cleanup_free_ char *u = NULL, *name_escaped = NULL, *mount = NULL;
 192         int r;
 193
 194         assert(name);
 195         assert(ret_umount_unit);
 196
 197         name_escaped = cescape(name);
 198         if (!name_escaped)
 199                 return -ENOMEM;
 200
 201         u = strjoin(type_prefix, "-", name_escaped, "-umount.service");
 202         if (!u)
 203                 return -ENOMEM;
 204
 205         r = unit_name_from_path(device_mount, ".mount", &mount);
 206         if (r < 0)
 207                 return r;
 208
 209         r = generator_open_unit_file(arg_dest, NULL, u, &f);
 210         if (r < 0)
 211                 return r;
 212
 213         fprintf(f,
 214                 "[Unit]\n"
 215                 "DefaultDependencies=no\n"
 216                 "After=%s\n\n"
 217                 "[Service]\n"
 218                 "ExecStart=-" UMOUNT_PATH " %s\n\n", mount, device_mount);
 219
 220         r = fflush_and_check(f);
 221         if (r < 0)
 222                 return r;
 223
 224         *ret_umount_unit = TAKE_PTR(u);
 225         return 0;
 226 }
 227
 228 static int print_dependencies(FILE *f, const char* device_path) {
 229         int r;
 230
 231         if (STR_IN_SET(device_path, "-", "none"))
 232                 /* None, nothing to do */
 233                 return 0;
 234
 235         if (PATH_IN_SET(device_path,
 236                         "/dev/urandom",
 237                         "/dev/random",
 238                         "/dev/hw_random",
 239                         "/dev/hwrng")) {
 240                 /* RNG device, add random dep */
 241                 fputs("After=systemd-random-seed.service\n", f);
 242                 return 0;
 243         }
 244
 245         _cleanup_free_ char *udev_node = fstab_node_to_udev_node(device_path);
 246         if (!udev_node)
 247                 return log_oom();
 248
 249         if (path_equal(udev_node, "/dev/null"))
 250                 return 0;
 251
 252         if (path_startswith(udev_node, "/dev/")) {
 253                 /* We are dealing with a block device, add dependency for corresponding unit */
 254                 _cleanup_free_ char *unit = NULL;
 255
 256                 r = unit_name_from_path(udev_node, ".device", &unit);
 257                 if (r < 0)
 258                         return log_error_errno(r, "Failed to generate unit name: %m");
 259
 260                 fprintf(f,
 261                         "After=%1$s\n"
 262                         "Requires=%1$s\n", unit);
 263         } else {
 264                 /* Regular file, add mount dependency */
 265                 _cleanup_free_ char *escaped_path = specifier_escape(device_path);
 266                 if (!escaped_path)
 267                         return log_oom();
 268
 269                 fprintf(f, "RequiresMountsFor=%s\n", escaped_path);
 270         }
 271
 272         return 0;
 273 }
 274
 275 static int create_disk(
 276                 const char *name,
 277                 const char *device,
 278                 const char *password,
 279                 const char *keydev,
 280                 const char *options,
 281                 const char *source) {
 282
 283         _cleanup_free_ char *n = NULL, *d = NULL, *u = NULL, *e = NULL,
 284                 *keydev_mount = NULL, *keyfile_timeout_value = NULL,
 285                 *filtered = NULL, *u_escaped = NULL, *name_escaped = NULL, *header_path = NULL, *password_buffer = NULL,
 286                 *tmp_fstype = NULL;
 287         _cleanup_fclose_ FILE *f = NULL;
 288         const char *dmname;
 289         bool noauto, nofail, swap, netdev, attach_in_initrd;
 290         int r, detached_header, keyfile_can_timeout, tmp;
 291
 292         assert(name);
 293         assert(device);
 294
 295         noauto = fstab_test_yes_no_option(options, "noauto\0" "auto\0");
 296         nofail = fstab_test_yes_no_option(options, "nofail\0" "fail\0");
 297         swap = fstab_test_option(options, "swap\0");
 298         netdev = fstab_test_option(options, "_netdev\0");
 299         attach_in_initrd = fstab_test_option(options, "x-initrd.attach\0");
 300
 301         keyfile_can_timeout = fstab_filter_options(options, "keyfile-timeout\0", NULL, &keyfile_timeout_value, NULL);
 302         if (keyfile_can_timeout < 0)
 303                 return log_error_errno(keyfile_can_timeout, "Failed to parse keyfile-timeout= option value: %m");
 304
 305         detached_header = fstab_filter_options(options, "header\0", NULL, &header_path, NULL);
 306         if (detached_header < 0)
 307                 return log_error_errno(detached_header, "Failed to parse header= option value: %m");
 308
 309         tmp = fstab_filter_options(options, "tmp\0", NULL, &tmp_fstype, NULL);
 310         if (tmp < 0)
 311                 return log_error_errno(tmp, "Failed to parse tmp= option value: %m");
 312
 313         if (tmp && swap)
 314                 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
 315                                        "Device '%s' cannot be both 'tmp' and 'swap'. Ignoring.",
 316                                        name);
 317
 318         name_escaped = specifier_escape(name);
 319         if (!name_escaped)
 320                 return log_oom();
 321
 322         e = unit_name_escape(name);
 323         if (!e)
 324                 return log_oom();
 325
 326         u = fstab_node_to_udev_node(device);
 327         if (!u)
 328                 return log_oom();
 329
 330         r = unit_name_build("systemd-cryptsetup", e, ".service", &n);
 331         if (r < 0)
 332                 return log_error_errno(r, "Failed to generate unit name: %m");
 333
 334         u_escaped = specifier_escape(u);
 335         if (!u_escaped)
 336                 return log_oom();
 337
 338         r = unit_name_from_path(u, ".device", &d);
 339         if (r < 0)
 340                 return log_error_errno(r, "Failed to generate unit name: %m");
 341
 342         if (keydev && !password)
 343                 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
 344                                        "Key device is specified, but path to the password file is missing.");
 345
 346         r = generator_open_unit_file(arg_dest, NULL, n, &f);
 347         if (r < 0)
 348                 return r;
 349
 350         r = generator_write_cryptsetup_unit_section(f, source);
 351         if (r < 0)
 352                 return r;
 353
 354         if (netdev)
 355                 fprintf(f, "After=remote-fs-pre.target\n");
 356
 357         /* If initrd takes care of attaching the disk then it should also detach it during shutdown. */
 358         if (!attach_in_initrd)
 359                 fprintf(f, "Conflicts=umount.target\n");
 360
 361         if (keydev) {
 362                 _cleanup_free_ char *unit = NULL, *umount_unit = NULL;
 363
 364                 r = generate_device_mount(
 365                         name,
 366                         keydev,
 367                         "keydev",
 368                         keyfile_timeout_value,
 369                         /* canfail = */ keyfile_can_timeout > 0,
 370                         /* readonly= */ true,
 371                         &unit,
 372                         &keydev_mount);
 373                 if (r < 0)
 374                         return log_error_errno(r, "Failed to generate keydev mount unit: %m");
 375
 376                 r = generate_device_umount(name, keydev_mount, "keydev", &umount_unit);
 377                 if (r < 0)
 378                         return log_error_errno(r, "Failed to generate keydev umount unit: %m");
 379
 380                 password_buffer = path_join(keydev_mount, password);
 381                 if (!password_buffer)
 382                         return log_oom();
 383
 384                 password = password_buffer;
 385
 386                 fprintf(f, "After=%s\n", unit);
 387                 if (keyfile_can_timeout > 0)
 388                         fprintf(f, "Wants=%s\n", unit);
 389                 else
 390                         fprintf(f, "Requires=%s\n", unit);
 391
 392                 if (umount_unit) {
 393                         fprintf(f,
 394                                 "Wants=%s\n"
 395                                 "Before=%s\n",
 396                                 umount_unit,
 397                                 umount_unit
 398                         );
 399                 }
 400         }
 401
 402         if (!nofail)
 403                 fprintf(f,
 404                         "Before=%s\n",
 405                         netdev ? "remote-cryptsetup.target" : "cryptsetup.target");
 406
 407         if (password && !keydev) {
 408                 r = print_dependencies(f, password);
 409                 if (r < 0)
 410                         return r;
 411         }
 412
 413         /* Check if a header option was specified */
 414         if (detached_header > 0) {
 415                 r = print_dependencies(f, header_path);
 416                 if (r < 0)
 417                         return r;
 418         }
 419
 420         if (path_startswith(u, "/dev/"))
 421                 fprintf(f,
 422                         "BindsTo=%s\n"
 423                         "After=%s\n"
 424                         "Before=umount.target\n",
 425                         d, d);
 426         else
 427                 /* For loopback devices, add systemd-tmpfiles-setup-dev.service
 428                    dependency to ensure that loopback support is available in
 429                    the kernel (/dev/loop-control needs to exist) */
 430                 fprintf(f,
 431                         "RequiresMountsFor=%s\n"
 432                         "Requires=systemd-tmpfiles-setup-dev.service\n"
 433                         "After=systemd-tmpfiles-setup-dev.service\n",
 434                         u_escaped);
 435
 436         r = generator_write_timeouts(arg_dest, device, name, options, &filtered);
 437         if (r < 0)
 438                 log_warning_errno(r, "Failed to write device timeout drop-in: %m");
 439
 440         r = generator_write_cryptsetup_service_section(f, name, u, password, filtered);
 441         if (r < 0)
 442                 return r;
 443
 444         if (tmp) {
 445                 _cleanup_free_ char *tmp_fstype_escaped = NULL;
 446
 447                 if (tmp_fstype) {
 448                         tmp_fstype_escaped = specifier_escape(tmp_fstype);
 449                         if (!tmp_fstype_escaped)
 450                                 return log_oom();
 451                 }
 452
 453                 fprintf(f,
 454                         "ExecStartPost=" ROOTLIBEXECDIR "/systemd-makefs '%s' '/dev/mapper/%s'\n",
 455                         tmp_fstype_escaped ?: "ext4", name_escaped);
 456         }
 457
 458         if (swap)
 459                 fprintf(f,
 460                         "ExecStartPost=" ROOTLIBEXECDIR "/systemd-makefs swap '/dev/mapper/%s'\n",
 461                         name_escaped);
 462
 463         r = fflush_and_check(f);
 464         if (r < 0)
 465                 return log_error_errno(r, "Failed to write unit file %s: %m", n);
 466
 467         if (!noauto) {
 468                 r = generator_add_symlink(arg_dest,
 469                                           netdev ? "remote-cryptsetup.target" : "cryptsetup.target",
 470                                           nofail ? "wants" : "requires", n);
 471                 if (r < 0)
 472                         return r;
 473         }
 474
 475         dmname = strjoina("dev-mapper-", e, ".device");
 476         r = generator_add_symlink(arg_dest, dmname, "requires", n);
 477         if (r < 0)
 478                 return r;
 479
 480         if (!noauto && !nofail) {
 481                 r = write_drop_in(arg_dest, dmname, 40, "device-timeout",
 482                                   "# Automatically generated by systemd-cryptsetup-generator\n\n"
 483                                   "[Unit]\nJobTimeoutSec=0");
 484                 if (r < 0)
 485                         log_warning_errno(r, "Failed to write device timeout drop-in: %m");
 486         }
 487
 488         return 0;
 489 }
 490
 491 static crypto_device* crypt_device_free(crypto_device *d) {
 492         if (!d)
 493                 return NULL;
 494
 495         free(d->uuid);
 496         free(d->keyfile);
 497         free(d->keydev);
 498         free(d->name);
 499         free(d->options);
 500         return mfree(d);
 501 }
 502
 503 static crypto_device *get_crypto_device(const char *uuid) {
 504         int r;
 505         crypto_device *d;
 506
 507         assert(uuid);
 508
 509         d = hashmap_get(arg_disks, uuid);
 510         if (!d) {
 511                 d = new0(struct crypto_device, 1);
 512                 if (!d)
 513                         return NULL;
 514
 515                 d->uuid = strdup(uuid);
 516                 if (!d->uuid)
 517                         return mfree(d);
 518
 519                 r = hashmap_put(arg_disks, d->uuid, d);
 520                 if (r < 0) {
 521                         free(d->uuid);
 522                         return mfree(d);
 523                 }
 524         }
 525
 526         return d;
 527 }
 528
 529 static bool warn_uuid_invalid(const char *uuid, const char *key) {
 530         assert(key);
 531
 532         if (!id128_is_valid(uuid)) {
 533                 log_warning("Failed to parse %s= kernel command line switch. UUID is invalid, ignoring.", key);
 534                 return true;
 535         }
 536
 537         return false;
 538 }
 539
 540 static int parse_proc_cmdline_item(const char *key, const char *value, void *data) {
 541         _cleanup_free_ char *uuid = NULL, *uuid_value = NULL;
 542         crypto_device *d;
 543         int r;
 544
 545         if (streq(key, "luks")) {
 546
 547                 r = value ? parse_boolean(value) : 1;
 548                 if (r < 0)
 549                         log_warning("Failed to parse luks= kernel command line switch %s. Ignoring.", value);
 550                 else
 551                         arg_enabled = r;
 552
 553         } else if (streq(key, "luks.crypttab")) {
 554
 555                 r = value ? parse_boolean(value) : 1;
 556                 if (r < 0)
 557                         log_warning("Failed to parse luks.crypttab= kernel command line switch %s. Ignoring.", value);
 558                 else
 559                         arg_read_crypttab = r;
 560
 561         } else if (streq(key, "luks.uuid")) {
 562
 563                 if (proc_cmdline_value_missing(key, value))
 564                         return 0;
 565
 566                 d = get_crypto_device(startswith(value, "luks-") ?: value);
 567                 if (!d)
 568                         return log_oom();
 569
 570                 d->create = arg_allow_list = true;
 571
 572         } else if (streq(key, "luks.options")) {
 573
 574                 if (proc_cmdline_value_missing(key, value))
 575                         return 0;
 576
 577                 r = sscanf(value, "%m[0-9a-fA-F-]=%ms", &uuid, &uuid_value);
 578                 if (r == 2) {
 579                         d = get_crypto_device(uuid);
 580                         if (!d)
 581                                 return log_oom();
 582
 583                         free_and_replace(d->options, uuid_value);
 584                 } else if (free_and_strdup(&arg_default_options, value) < 0)
 585                         return log_oom();
 586
 587         } else if (streq(key, "luks.key")) {
 588                 size_t n;
 589                 _cleanup_free_ char *keyfile = NULL, *keydev = NULL;
 590                 const char *keyspec;
 591
 592                 if (proc_cmdline_value_missing(key, value))
 593                         return 0;
 594
 595                 n = strspn(value, ALPHANUMERICAL "-");
 596                 if (value[n] != '=') {
 597                         if (free_and_strdup(&arg_default_keyfile, value) < 0)
 598                                  return log_oom();
 599                         return 0;
 600                 }
 601
 602                 uuid = strndup(value, n);
 603                 if (!uuid)
 604                         return log_oom();
 605
 606                 if (warn_uuid_invalid(uuid, key))
 607                         return 0;
 608
 609                 d = get_crypto_device(uuid);
 610                 if (!d)
 611                         return log_oom();
 612
 613                 keyspec = value + n + 1;
 614                 r = split_keyspec(keyspec, &keyfile, &keydev);
 615                 if (r < 0)
 616                         return r;
 617
 618                 free_and_replace(d->keyfile, keyfile);
 619                 free_and_replace(d->keydev, keydev);
 620
 621         } else if (streq(key, "luks.name")) {
 622
 623                 if (proc_cmdline_value_missing(key, value))
 624                         return 0;
 625
 626                 r = sscanf(value, "%m[0-9a-fA-F-]=%ms", &uuid, &uuid_value);
 627                 if (r == 2) {
 628                         d = get_crypto_device(uuid);
 629                         if (!d)
 630                                 return log_oom();
 631
 632                         d->create = arg_allow_list = true;
 633
 634                         free_and_replace(d->name, uuid_value);
 635                 } else
 636                         log_warning("Failed to parse luks name switch %s. Ignoring.", value);
 637         }
 638
 639         return 0;
 640 }
 641
 642 static int add_crypttab_devices(void) {
 643         _cleanup_fclose_ FILE *f = NULL;
 644         unsigned crypttab_line = 0;
 645         struct stat st;
 646         int r;
 647
 648         if (!arg_read_crypttab)
 649                 return 0;
 650
 651         r = fopen_unlocked(arg_crypttab, "re", &f);
 652         if (r < 0) {
 653                 if (errno != ENOENT)
 654                         log_error_errno(errno, "Failed to open %s: %m", arg_crypttab);
 655                 return 0;
 656         }
 657
 658         if (fstat(fileno(f), &st) < 0) {
 659                 log_error_errno(errno, "Failed to stat %s: %m", arg_crypttab);
 660                 return 0;
 661         }
 662
 663         for (;;) {
 664                 _cleanup_free_ char *line = NULL, *name = NULL, *device = NULL, *keyspec = NULL, *options = NULL, *keyfile = NULL, *keydev = NULL;
 665                 crypto_device *d = NULL;
 666                 char *l, *uuid;
 667                 int k;
 668
 669                 r = read_line(f, LONG_LINE_MAX, &line);
 670                 if (r < 0)
 671                         return log_error_errno(r, "Failed to read %s: %m", arg_crypttab);
 672                 if (r == 0)
 673                         break;
 674
 675                 crypttab_line++;
 676
 677                 l = strstrip(line);
 678                 if (IN_SET(l[0], 0, '#'))
 679                         continue;
 680
 681                 k = sscanf(l, "%ms %ms %ms %ms", &name, &device, &keyspec, &options);
 682                 if (k < 2 || k > 4) {
 683                         log_error("Failed to parse %s:%u, ignoring.", arg_crypttab, crypttab_line);
 684                         continue;
 685                 }
 686
 687                 uuid = startswith(device, "UUID=");
 688                 if (!uuid)
 689                         uuid = path_startswith(device, "/dev/disk/by-uuid/");
 690                 if (!uuid)
 691                         uuid = startswith(name, "luks-");
 692                 if (uuid)
 693                         d = hashmap_get(arg_disks, uuid);
 694
 695                 if (arg_allow_list && !d) {
 696                         log_info("Not creating device '%s' because it was not specified on the kernel command line.", name);
 697                         continue;
 698                 }
 699
 700                 r = split_keyspec(keyspec, &keyfile, &keydev);
 701                 if (r < 0)
 702                         return r;
 703
 704                 r = create_disk(name, device, keyfile, keydev, (d && d->options) ? d->options : options, arg_crypttab);
 705                 if (r < 0)
 706                         return r;
 707
 708                 if (d)
 709                         d->create = false;
 710         }
 711
 712         return 0;
 713 }
 714
 715 static int add_proc_cmdline_devices(void) {
 716         int r;
 717         crypto_device *d;
 718
 719         HASHMAP_FOREACH(d, arg_disks) {
 720                 _cleanup_free_ char *device = NULL;
 721
 722                 if (!d->create)
 723                         continue;
 724
 725                 if (!d->name) {
 726                         d->name = strjoin("luks-", d->uuid);
 727                         if (!d->name)
 728                                 return log_oom();
 729                 }
 730
 731                 device = strjoin("UUID=", d->uuid);
 732                 if (!device)
 733                         return log_oom();
 734
 735                 r = create_disk(d->name,
 736                                 device,
 737                                 d->keyfile ?: arg_default_keyfile,
 738                                 d->keydev,
 739                                 d->options ?: arg_default_options,
 740                                 "/proc/cmdline");
 741                 if (r < 0)
 742                         return r;
 743         }
 744
 745         return 0;
 746 }
 747
 748 DEFINE_PRIVATE_HASH_OPS_WITH_VALUE_DESTRUCTOR(crypt_device_hash_ops, char, string_hash_func, string_compare_func,
 749                                               crypto_device, crypt_device_free);
 750
 751 static int run(const char *dest, const char *dest_early, const char *dest_late) {
 752         int r;
 753
 754         assert_se(arg_dest = dest);
 755
 756         arg_crypttab = getenv("SYSTEMD_CRYPTTAB") ?: "/etc/crypttab";
 757         arg_runtime_directory = getenv("RUNTIME_DIRECTORY") ?: "/run/systemd/cryptsetup";
 758
 759         arg_disks = hashmap_new(&crypt_device_hash_ops);
 760         if (!arg_disks)
 761                 return log_oom();
 762
 763         r = proc_cmdline_parse(parse_proc_cmdline_item, NULL, PROC_CMDLINE_STRIP_RD_PREFIX);
 764         if (r < 0)
 765                 return log_warning_errno(r, "Failed to parse kernel command line: %m");
 766
 767         if (!arg_enabled)
 768                 return 0;
 769
 770         r = add_crypttab_devices();
 771         if (r < 0)
 772                 return r;
 773
 774         r = add_proc_cmdline_devices();
 775         if (r < 0)
 776                 return r;
 777
 778         return 0;
 779 }
 780
 781 DEFINE_MAIN_GENERATOR_FUNCTION(run);