src/cryptsetup/cryptsetup.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include <errno.h>
   4 #include <mntent.h>
   5 #include <string.h>
   6 #include <sys/mman.h>
   7
   8 #include "sd-device.h"
   9
  10 #include "alloc-util.h"
  11 #include "ask-password-api.h"
  12 #include "crypt-util.h"
  13 #include "device-util.h"
  14 #include "escape.h"
  15 #include "fileio.h"
  16 #include "log.h"
  17 #include "mount-util.h"
  18 #include "parse-util.h"
  19 #include "path-util.h"
  20 #include "string-util.h"
  21 #include "strv.h"
  22 #include "terminal-util.h"
  23 #include "util.h"
  24
  25 /* internal helper */
  26 #define ANY_LUKS "LUKS"
  27 /* as in src/cryptsetup.h */
  28 #define CRYPT_SECTOR_SIZE 512
  29 #define CRYPT_MAX_SECTOR_SIZE 4096
  30
  31 static const char *arg_type = NULL; /* ANY_LUKS, CRYPT_LUKS1, CRYPT_LUKS2, CRYPT_TCRYPT or CRYPT_PLAIN */
  32 static char *arg_cipher = NULL;
  33 static unsigned arg_key_size = 0;
  34 static unsigned arg_sector_size = CRYPT_SECTOR_SIZE;
  35 static int arg_key_slot = CRYPT_ANY_SLOT;
  36 static unsigned arg_keyfile_size = 0;
  37 static uint64_t arg_keyfile_offset = 0;
  38 static char *arg_hash = NULL;
  39 static char *arg_header = NULL;
  40 static unsigned arg_tries = 3;
  41 static bool arg_readonly = false;
  42 static bool arg_verify = false;
  43 static bool arg_discards = false;
  44 static bool arg_tcrypt_hidden = false;
  45 static bool arg_tcrypt_system = false;
  46 #ifdef CRYPT_TCRYPT_VERA_MODES
  47 static bool arg_tcrypt_veracrypt = false;
  48 #endif
  49 static char **arg_tcrypt_keyfiles = NULL;
  50 static uint64_t arg_offset = 0;
  51 static uint64_t arg_skip = 0;
  52 static usec_t arg_timeout = USEC_INFINITY;
  53
  54 /* Options Debian's crypttab knows we don't:
  55
  56     precheck=
  57     check=
  58     checkargs=
  59     noearly=
  60     loud=
  61     keyscript=
  62 */
  63
  64 static int parse_one_option(const char *option) {
  65         const char *val;
  66         int r;
  67
  68         assert(option);
  69
  70         /* Handled outside of this tool */
  71         if (STR_IN_SET(option, "noauto", "auto", "nofail", "fail", "_netdev"))
  72                 return 0;
  73
  74         if ((val = startswith(option, "cipher="))) {
  75                 r = free_and_strdup(&arg_cipher, val);
  76                 if (r < 0)
  77                         return log_oom();
  78
  79         } else if ((val = startswith(option, "size="))) {
  80
  81                 r = safe_atou(val, &arg_key_size);
  82                 if (r < 0) {
  83                         log_error_errno(r, "Failed to parse %s, ignoring: %m", option);
  84                         return 0;
  85                 }
  86
  87                 if (arg_key_size % 8) {
  88                         log_error("size= not a multiple of 8, ignoring.");
  89                         return 0;
  90                 }
  91
  92                 arg_key_size /= 8;
  93
  94         } else if ((val = startswith(option, "sector-size="))) {
  95
  96 #if HAVE_LIBCRYPTSETUP_SECTOR_SIZE
  97                 r = safe_atou(val, &arg_sector_size);
  98                 if (r < 0) {
  99                         log_error_errno(r, "Failed to parse %s, ignoring: %m", option);
 100                         return 0;
 101                 }
 102
 103                 if (arg_sector_size % 2) {
 104                         log_error("sector-size= not a multiple of 2, ignoring.");
 105                         return 0;
 106                 }
 107
 108                 if (arg_sector_size < CRYPT_SECTOR_SIZE || arg_sector_size > CRYPT_MAX_SECTOR_SIZE) {
 109                         log_error("sector-size= is outside of %u and %u, ignoring.", CRYPT_SECTOR_SIZE, CRYPT_MAX_SECTOR_SIZE);
 110                         return 0;
 111                 }
 112 #else
 113                 log_error("sector-size= is not supported, compiled with old libcryptsetup.");
 114                 return 0;
 115 #endif
 116
 117         } else if ((val = startswith(option, "key-slot="))) {
 118
 119                 arg_type = ANY_LUKS;
 120                 r = safe_atoi(val, &arg_key_slot);
 121                 if (r < 0) {
 122                         log_error_errno(r, "Failed to parse %s, ignoring: %m", option);
 123                         return 0;
 124                 }
 125
 126         } else if ((val = startswith(option, "tcrypt-keyfile="))) {
 127
 128                 arg_type = CRYPT_TCRYPT;
 129                 if (path_is_absolute(val)) {
 130                         if (strv_extend(&arg_tcrypt_keyfiles, val) < 0)
 131                                 return log_oom();
 132                 } else
 133                         log_error("Key file path \"%s\" is not absolute. Ignoring.", val);
 134
 135         } else if ((val = startswith(option, "keyfile-size="))) {
 136
 137                 r = safe_atou(val, &arg_keyfile_size);
 138                 if (r < 0) {
 139                         log_error_errno(r, "Failed to parse %s, ignoring: %m", option);
 140                         return 0;
 141                 }
 142
 143         } else if ((val = startswith(option, "keyfile-offset="))) {
 144                 uint64_t off;
 145
 146                 r = safe_atou64(val, &off);
 147                 if (r < 0) {
 148                         log_error_errno(r, "Failed to parse %s, ignoring: %m", option);
 149                         return 0;
 150                 }
 151
 152                 if ((size_t) off != off) {
 153                         /* https://gitlab.com/cryptsetup/cryptsetup/issues/359 */
 154                         log_error("keyfile-offset= value would truncated to %zu, ignoring.", (size_t) off);
 155                         return 0;
 156                 }
 157
 158                 arg_keyfile_offset = off;
 159
 160         } else if ((val = startswith(option, "hash="))) {
 161                 r = free_and_strdup(&arg_hash, val);
 162                 if (r < 0)
 163                         return log_oom();
 164
 165         } else if ((val = startswith(option, "header="))) {
 166                 arg_type = ANY_LUKS;
 167
 168                 if (!path_is_absolute(val)) {
 169                         log_error("Header path \"%s\" is not absolute, refusing.", val);
 170                         return -EINVAL;
 171                 }
 172
 173                 if (arg_header) {
 174                         log_error("Duplicate header= option, refusing.");
 175                         return -EINVAL;
 176                 }
 177
 178                 arg_header = strdup(val);
 179                 if (!arg_header)
 180                         return log_oom();
 181
 182         } else if ((val = startswith(option, "tries="))) {
 183
 184                 r = safe_atou(val, &arg_tries);
 185                 if (r < 0) {
 186                         log_error_errno(r, "Failed to parse %s, ignoring: %m", option);
 187                         return 0;
 188                 }
 189
 190         } else if (STR_IN_SET(option, "readonly", "read-only"))
 191                 arg_readonly = true;
 192         else if (streq(option, "verify"))
 193                 arg_verify = true;
 194         else if (STR_IN_SET(option, "allow-discards", "discard"))
 195                 arg_discards = true;
 196         else if (streq(option, "luks"))
 197                 arg_type = ANY_LUKS;
 198         else if (streq(option, "tcrypt"))
 199                 arg_type = CRYPT_TCRYPT;
 200         else if (streq(option, "tcrypt-hidden")) {
 201                 arg_type = CRYPT_TCRYPT;
 202                 arg_tcrypt_hidden = true;
 203         } else if (streq(option, "tcrypt-system")) {
 204                 arg_type = CRYPT_TCRYPT;
 205                 arg_tcrypt_system = true;
 206         } else if (streq(option, "tcrypt-veracrypt")) {
 207 #ifdef CRYPT_TCRYPT_VERA_MODES
 208                 arg_type = CRYPT_TCRYPT;
 209                 arg_tcrypt_veracrypt = true;
 210 #else
 211                 log_error("This version of cryptsetup does not support tcrypt-veracrypt; refusing.");
 212                 return -EINVAL;
 213 #endif
 214         } else if (STR_IN_SET(option, "plain", "swap", "tmp"))
 215                 arg_type = CRYPT_PLAIN;
 216         else if ((val = startswith(option, "timeout="))) {
 217
 218                 r = parse_sec_fix_0(val, &arg_timeout);
 219                 if (r < 0) {
 220                         log_error_errno(r, "Failed to parse %s, ignoring: %m", option);
 221                         return 0;
 222                 }
 223
 224         } else if ((val = startswith(option, "offset="))) {
 225
 226                 r = safe_atou64(val, &arg_offset);
 227                 if (r < 0)
 228                         return log_error_errno(r, "Failed to parse %s: %m", option);
 229
 230         } else if ((val = startswith(option, "skip="))) {
 231
 232                 r = safe_atou64(val, &arg_skip);
 233                 if (r < 0)
 234                         return log_error_errno(r, "Failed to parse %s: %m", option);
 235
 236         } else if (!streq(option, "none"))
 237                 log_warning("Encountered unknown /etc/crypttab option '%s', ignoring.", option);
 238
 239         return 0;
 240 }
 241
 242 static int parse_options(const char *options) {
 243         const char *word, *state;
 244         size_t l;
 245         int r;
 246
 247         assert(options);
 248
 249         FOREACH_WORD_SEPARATOR(word, l, options, ",", state) {
 250                 _cleanup_free_ char *o;
 251
 252                 o = strndup(word, l);
 253                 if (!o)
 254                         return -ENOMEM;
 255                 r = parse_one_option(o);
 256                 if (r < 0)
 257                         return r;
 258         }
 259
 260         /* sanity-check options */
 261         if (arg_type != NULL && !streq(arg_type, CRYPT_PLAIN)) {
 262                 if (arg_offset)
 263                       log_warning("offset= ignored with type %s", arg_type);
 264                 if (arg_skip)
 265                       log_warning("skip= ignored with type %s", arg_type);
 266         }
 267
 268         return 0;
 269 }
 270
 271 static char* disk_description(const char *path) {
 272
 273         static const char name_fields[] =
 274                 "ID_PART_ENTRY_NAME\0"
 275                 "DM_NAME\0"
 276                 "ID_MODEL_FROM_DATABASE\0"
 277                 "ID_MODEL\0";
 278
 279         _cleanup_(sd_device_unrefp) sd_device *device = NULL;
 280         struct stat st;
 281         const char *i;
 282         int r;
 283
 284         assert(path);
 285
 286         if (stat(path, &st) < 0)
 287                 return NULL;
 288
 289         if (!S_ISBLK(st.st_mode))
 290                 return NULL;
 291
 292         r = sd_device_new_from_devnum(&device, 'b', st.st_rdev);
 293         if (r < 0)
 294                 return NULL;
 295
 296         NULSTR_FOREACH(i, name_fields) {
 297                 const char *name;
 298
 299                 r = sd_device_get_property_value(device, i, &name);
 300                 if (r >= 0 && !isempty(name))
 301                         return strdup(name);
 302         }
 303
 304         return NULL;
 305 }
 306
 307 static char *disk_mount_point(const char *label) {
 308         _cleanup_free_ char *device = NULL;
 309         _cleanup_endmntent_ FILE *f = NULL;
 310         struct mntent *m;
 311
 312         /* Yeah, we don't support native systemd unit files here for now */
 313
 314         if (asprintf(&device, "/dev/mapper/%s", label) < 0)
 315                 return NULL;
 316
 317         f = setmntent("/etc/fstab", "re");
 318         if (!f)
 319                 return NULL;
 320
 321         while ((m = getmntent(f)))
 322                 if (path_equal(m->mnt_fsname, device))
 323                         return strdup(m->mnt_dir);
 324
 325         return NULL;
 326 }
 327
 328 static int get_password(const char *vol, const char *src, usec_t until, bool accept_cached, char ***ret) {
 329         _cleanup_free_ char *description = NULL, *name_buffer = NULL, *mount_point = NULL, *text = NULL, *disk_path = NULL;
 330         _cleanup_strv_free_erase_ char **passwords = NULL;
 331         const char *name = NULL;
 332         char **p, *id;
 333         int r = 0;
 334
 335         assert(vol);
 336         assert(src);
 337         assert(ret);
 338
 339         description = disk_description(src);
 340         mount_point = disk_mount_point(vol);
 341
 342         disk_path = cescape(src);
 343         if (!disk_path)
 344                 return log_oom();
 345
 346         if (description && streq(vol, description))
 347                 /* If the description string is simply the
 348                  * volume name, then let's not show this
 349                  * twice */
 350                 description = mfree(description);
 351
 352         if (mount_point && description)
 353                 r = asprintf(&name_buffer, "%s (%s) on %s", description, vol, mount_point);
 354         else if (mount_point)
 355                 r = asprintf(&name_buffer, "%s on %s", vol, mount_point);
 356         else if (description)
 357                 r = asprintf(&name_buffer, "%s (%s)", description, vol);
 358
 359         if (r < 0)
 360                 return log_oom();
 361
 362         name = name_buffer ? name_buffer : vol;
 363
 364         if (asprintf(&text, "Please enter passphrase for disk %s!", name) < 0)
 365                 return log_oom();
 366
 367         id = strjoina("cryptsetup:", disk_path);
 368
 369         r = ask_password_auto(text, "drive-harddisk", id, "cryptsetup", until,
 370                               ASK_PASSWORD_PUSH_CACHE | (accept_cached*ASK_PASSWORD_ACCEPT_CACHED),
 371                               &passwords);
 372         if (r < 0)
 373                 return log_error_errno(r, "Failed to query password: %m");
 374
 375         if (arg_verify) {
 376                 _cleanup_strv_free_erase_ char **passwords2 = NULL;
 377
 378                 assert(strv_length(passwords) == 1);
 379
 380                 if (asprintf(&text, "Please enter passphrase for disk %s! (verification)", name) < 0)
 381                         return log_oom();
 382
 383                 id = strjoina("cryptsetup-verification:", disk_path);
 384
 385                 r = ask_password_auto(text, "drive-harddisk", id, "cryptsetup", until, ASK_PASSWORD_PUSH_CACHE, &passwords2);
 386                 if (r < 0)
 387                         return log_error_errno(r, "Failed to query verification password: %m");
 388
 389                 assert(strv_length(passwords2) == 1);
 390
 391                 if (!streq(passwords[0], passwords2[0])) {
 392                         log_warning("Passwords did not match, retrying.");
 393                         return -EAGAIN;
 394                 }
 395         }
 396
 397         strv_uniq(passwords);
 398
 399         STRV_FOREACH(p, passwords) {
 400                 char *c;
 401
 402                 if (strlen(*p)+1 >= arg_key_size)
 403                         continue;
 404
 405                 /* Pad password if necessary */
 406                 c = new(char, arg_key_size);
 407                 if (!c)
 408                         return log_oom();
 409
 410                 strncpy(c, *p, arg_key_size);
 411                 free(*p);
 412                 *p = c;
 413         }
 414
 415         *ret = TAKE_PTR(passwords);
 416
 417         return 0;
 418 }
 419
 420 static int attach_tcrypt(
 421                 struct crypt_device *cd,
 422                 const char *name,
 423                 const char *key_file,
 424                 char **passwords,
 425                 uint32_t flags) {
 426
 427         int r = 0;
 428         _cleanup_free_ char *passphrase = NULL;
 429         struct crypt_params_tcrypt params = {
 430                 .flags = CRYPT_TCRYPT_LEGACY_MODES,
 431                 .keyfiles = (const char **)arg_tcrypt_keyfiles,
 432                 .keyfiles_count = strv_length(arg_tcrypt_keyfiles)
 433         };
 434
 435         assert(cd);
 436         assert(name);
 437         assert(key_file || (passwords && passwords[0]));
 438
 439         if (arg_tcrypt_hidden)
 440                 params.flags |= CRYPT_TCRYPT_HIDDEN_HEADER;
 441
 442         if (arg_tcrypt_system)
 443                 params.flags |= CRYPT_TCRYPT_SYSTEM_HEADER;
 444
 445 #ifdef CRYPT_TCRYPT_VERA_MODES
 446         if (arg_tcrypt_veracrypt)
 447                 params.flags |= CRYPT_TCRYPT_VERA_MODES;
 448 #endif
 449
 450         if (key_file) {
 451                 r = read_one_line_file(key_file, &passphrase);
 452                 if (r < 0) {
 453                         log_error_errno(r, "Failed to read password file '%s': %m", key_file);
 454                         return -EAGAIN;
 455                 }
 456
 457                 params.passphrase = passphrase;
 458         } else
 459                 params.passphrase = passwords[0];
 460         params.passphrase_size = strlen(params.passphrase);
 461
 462         r = crypt_load(cd, CRYPT_TCRYPT, &params);
 463         if (r < 0) {
 464                 if (key_file && r == -EPERM) {
 465                         log_error("Failed to activate using password file '%s'.", key_file);
 466                         return -EAGAIN;
 467                 }
 468                 return r;
 469         }
 470
 471         return crypt_activate_by_volume_key(cd, name, NULL, 0, flags);
 472 }
 473
 474 static int attach_luks_or_plain(struct crypt_device *cd,
 475                                 const char *name,
 476                                 const char *key_file,
 477                                 const char *data_device,
 478                                 char **passwords,
 479                                 uint32_t flags) {
 480         int r = 0;
 481         bool pass_volume_key = false;
 482
 483         assert(cd);
 484         assert(name);
 485         assert(key_file || passwords);
 486
 487         if (!arg_type || STR_IN_SET(arg_type, ANY_LUKS, CRYPT_LUKS1)) {
 488                 r = crypt_load(cd, CRYPT_LUKS, NULL);
 489                 if (r < 0) {
 490                         log_error("crypt_load() failed on device %s.\n", crypt_get_device_name(cd));
 491                         return r;
 492                 }
 493
 494                 if (data_device)
 495                         r = crypt_set_data_device(cd, data_device);
 496         }
 497
 498         if ((!arg_type && r < 0) || streq_ptr(arg_type, CRYPT_PLAIN)) {
 499                 struct crypt_params_plain params = {
 500                         .offset = arg_offset,
 501                         .skip = arg_skip,
 502 #if HAVE_LIBCRYPTSETUP_SECTOR_SIZE
 503                         .sector_size = arg_sector_size,
 504 #endif
 505                 };
 506                 const char *cipher, *cipher_mode;
 507                 _cleanup_free_ char *truncated_cipher = NULL;
 508
 509                 if (arg_hash) {
 510                         /* plain isn't a real hash type. it just means "use no hash" */
 511                         if (!streq(arg_hash, "plain"))
 512                                 params.hash = arg_hash;
 513                 } else if (!key_file)
 514                         /* for CRYPT_PLAIN, the behaviour of cryptsetup
 515                          * package is to not hash when a key file is provided */
 516                         params.hash = "ripemd160";
 517
 518                 if (arg_cipher) {
 519                         size_t l;
 520
 521                         l = strcspn(arg_cipher, "-");
 522                         truncated_cipher = strndup(arg_cipher, l);
 523                         if (!truncated_cipher)
 524                                 return log_oom();
 525
 526                         cipher = truncated_cipher;
 527                         cipher_mode = arg_cipher[l] ? arg_cipher+l+1 : "plain";
 528                 } else {
 529                         cipher = "aes";
 530                         cipher_mode = "cbc-essiv:sha256";
 531                 }
 532
 533                 /* for CRYPT_PLAIN limit reads
 534                  * from keyfile to key length, and
 535                  * ignore keyfile-size */
 536                 arg_keyfile_size = arg_key_size;
 537
 538                 /* In contrast to what the name
 539                  * crypt_setup() might suggest this
 540                  * doesn't actually format anything,
 541                  * it just configures encryption
 542                  * parameters when used for plain
 543                  * mode. */
 544                 r = crypt_format(cd, CRYPT_PLAIN, cipher, cipher_mode, NULL, NULL, arg_keyfile_size, &params);
 545
 546                 /* hash == NULL implies the user passed "plain" */
 547                 pass_volume_key = (params.hash == NULL);
 548         }
 549
 550         if (r < 0)
 551                 return log_error_errno(r, "Loading of cryptographic parameters failed: %m");
 552
 553         log_info("Set cipher %s, mode %s, key size %i bits for device %s.",
 554                  crypt_get_cipher(cd),
 555                  crypt_get_cipher_mode(cd),
 556                  crypt_get_volume_key_size(cd)*8,
 557                  crypt_get_device_name(cd));
 558
 559         if (key_file) {
 560                 r = crypt_activate_by_keyfile_offset(cd, name, arg_key_slot, key_file, arg_keyfile_size, arg_keyfile_offset, flags);
 561                 if (r < 0) {
 562                         log_error_errno(r, "Failed to activate with key file '%s': %m", key_file);
 563                         return -EAGAIN;
 564                 }
 565         } else {
 566                 char **p;
 567
 568                 STRV_FOREACH(p, passwords) {
 569                         if (pass_volume_key)
 570                                 r = crypt_activate_by_volume_key(cd, name, *p, arg_key_size, flags);
 571                         else
 572                                 r = crypt_activate_by_passphrase(cd, name, arg_key_slot, *p, strlen(*p), flags);
 573
 574                         if (r >= 0)
 575                                 break;
 576                 }
 577         }
 578
 579         return r;
 580 }
 581
 582 static int help(void) {
 583         _cleanup_free_ char *link = NULL;
 584         int r;
 585
 586         r = terminal_urlify_man("systemd-cryptsetup@.service", "8", &link);
 587         if (r < 0)
 588                 return log_oom();
 589
 590         printf("%s attach VOLUME SOURCEDEVICE [PASSWORD] [OPTIONS]\n"
 591                "%s detach VOLUME\n\n"
 592                "Attaches or detaches an encrypted block device.\n"
 593                "\nSee the %s for details.\n"
 594                , program_invocation_short_name
 595                , program_invocation_short_name
 596                , link
 597         );
 598
 599         return 0;
 600 }
 601
 602 int main(int argc, char *argv[]) {
 603         _cleanup_(crypt_freep) struct crypt_device *cd = NULL;
 604         int r = -EINVAL;
 605
 606         if (argc <= 1) {
 607                 r = help();
 608                 goto finish;
 609         }
 610
 611         if (argc < 3) {
 612                 log_error("This program requires at least two arguments.");
 613                 goto finish;
 614         }
 615
 616         log_set_target(LOG_TARGET_AUTO);
 617         log_parse_environment();
 618         log_open();
 619
 620         umask(0022);
 621
 622         if (streq(argv[1], "attach")) {
 623                 uint32_t flags = 0;
 624                 unsigned tries;
 625                 usec_t until;
 626                 crypt_status_info status;
 627                 const char *key_file = NULL;
 628
 629                 /* Arguments: systemd-cryptsetup attach VOLUME SOURCE-DEVICE [PASSWORD] [OPTIONS] */
 630
 631                 if (argc < 4) {
 632                         log_error("attach requires at least two arguments.");
 633                         goto finish;
 634                 }
 635
 636                 if (argc >= 5 &&
 637                     argv[4][0] &&
 638                     !streq(argv[4], "-") &&
 639                     !streq(argv[4], "none")) {
 640
 641                         if (!path_is_absolute(argv[4]))
 642                                 log_error("Password file path '%s' is not absolute. Ignoring.", argv[4]);
 643                         else
 644                                 key_file = argv[4];
 645                 }
 646
 647                 if (argc >= 6 && argv[5][0] && !streq(argv[5], "-")) {
 648                         if (parse_options(argv[5]) < 0)
 649                                 goto finish;
 650                 }
 651
 652                 /* A delicious drop of snake oil */
 653                 mlockall(MCL_FUTURE);
 654
 655                 if (arg_header) {
 656                         log_debug("LUKS header: %s", arg_header);
 657                         r = crypt_init(&cd, arg_header);
 658                 } else
 659                         r = crypt_init(&cd, argv[3]);
 660                 if (r < 0) {
 661                         log_error_errno(r, "crypt_init() failed: %m");
 662                         goto finish;
 663                 }
 664
 665                 crypt_set_log_callback(cd, cryptsetup_log_glue, NULL);
 666
 667                 status = crypt_status(cd, argv[2]);
 668                 if (IN_SET(status, CRYPT_ACTIVE, CRYPT_BUSY)) {
 669                         log_info("Volume %s already active.", argv[2]);
 670                         r = 0;
 671                         goto finish;
 672                 }
 673
 674                 if (arg_readonly)
 675                         flags |= CRYPT_ACTIVATE_READONLY;
 676
 677                 if (arg_discards)
 678                         flags |= CRYPT_ACTIVATE_ALLOW_DISCARDS;
 679
 680                 if (arg_timeout == USEC_INFINITY)
 681                         until = 0;
 682                 else
 683                         until = now(CLOCK_MONOTONIC) + arg_timeout;
 684
 685                 arg_key_size = (arg_key_size > 0 ? arg_key_size : (256 / 8));
 686
 687                 if (key_file) {
 688                         struct stat st;
 689
 690                         /* Ideally we'd do this on the open fd, but since this is just a
 691                          * warning it's OK to do this in two steps. */
 692                         if (stat(key_file, &st) >= 0 && S_ISREG(st.st_mode) && (st.st_mode & 0005))
 693                                 log_warning("Key file %s is world-readable. This is not a good idea!", key_file);
 694                 }
 695
 696                 for (tries = 0; arg_tries == 0 || tries < arg_tries; tries++) {
 697                         _cleanup_strv_free_erase_ char **passwords = NULL;
 698
 699                         if (!key_file) {
 700                                 r = get_password(argv[2], argv[3], until, tries == 0 && !arg_verify, &passwords);
 701                                 if (r == -EAGAIN)
 702                                         continue;
 703                                 if (r < 0)
 704                                         goto finish;
 705                         }
 706
 707                         if (streq_ptr(arg_type, CRYPT_TCRYPT))
 708                                 r = attach_tcrypt(cd, argv[2], key_file, passwords, flags);
 709                         else
 710                                 r = attach_luks_or_plain(cd,
 711                                                          argv[2],
 712                                                          key_file,
 713                                                          arg_header ? argv[3] : NULL,
 714                                                          passwords,
 715                                                          flags);
 716                         if (r >= 0)
 717                                 break;
 718                         if (r == -EAGAIN) {
 719                                 key_file = NULL;
 720                                 continue;
 721                         }
 722                         if (r != -EPERM) {
 723                                 log_error_errno(r, "Failed to activate: %m");
 724                                 goto finish;
 725                         }
 726
 727                         log_warning("Invalid passphrase.");
 728                 }
 729
 730                 if (arg_tries != 0 && tries >= arg_tries) {
 731                         log_error("Too many attempts; giving up.");
 732                         r = -EPERM;
 733                         goto finish;
 734                 }
 735
 736         } else if (streq(argv[1], "detach")) {
 737
 738                 r = crypt_init_by_name(&cd, argv[2]);
 739                 if (r == -ENODEV) {
 740                         log_info("Volume %s already inactive.", argv[2]);
 741                         r = 0;
 742                         goto finish;
 743                 }
 744                 if (r < 0) {
 745                         log_error_errno(r, "crypt_init_by_name() failed: %m");
 746                         goto finish;
 747                 }
 748
 749                 crypt_set_log_callback(cd, cryptsetup_log_glue, NULL);
 750
 751                 r = crypt_deactivate(cd, argv[2]);
 752                 if (r < 0) {
 753                         log_error_errno(r, "Failed to deactivate: %m");
 754                         goto finish;
 755                 }
 756
 757         } else {
 758                 log_error("Unknown verb %s.", argv[1]);
 759                 goto finish;
 760         }
 761
 762         r = 0;
 763
 764 finish:
 765         free(arg_cipher);
 766         free(arg_hash);
 767         free(arg_header);
 768         strv_free(arg_tcrypt_keyfiles);
 769
 770         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 771 }