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 #if HAVE_LIBCRYPTSETUP_SECTOR_SIZE
  35 static unsigned arg_sector_size = CRYPT_SECTOR_SIZE;
  36 #endif
  37 static int arg_key_slot = CRYPT_ANY_SLOT;
  38 static unsigned arg_keyfile_size = 0;
  39 static uint64_t arg_keyfile_offset = 0;
  40 static char *arg_hash = NULL;
  41 static char *arg_header = NULL;
  42 static unsigned arg_tries = 3;
  43 static bool arg_readonly = false;
  44 static bool arg_verify = false;
  45 static bool arg_discards = false;
  46 static bool arg_tcrypt_hidden = false;
  47 static bool arg_tcrypt_system = false;
  48 #ifdef CRYPT_TCRYPT_VERA_MODES
  49 static bool arg_tcrypt_veracrypt = false;
  50 #endif
  51 static char **arg_tcrypt_keyfiles = NULL;
  52 static uint64_t arg_offset = 0;
  53 static uint64_t arg_skip = 0;
  54 static usec_t arg_timeout = USEC_INFINITY;
  55
  56 /* Options Debian's crypttab knows we don't:
  57
  58     precheck=
  59     check=
  60     checkargs=
  61     noearly=
  62     loud=
  63     keyscript=
  64 */
  65
  66 static int parse_one_option(const char *option) {
  67         const char *val;
  68         int r;
  69
  70         assert(option);
  71
  72         /* Handled outside of this tool */
  73         if (STR_IN_SET(option, "noauto", "auto", "nofail", "fail", "_netdev"))
  74                 return 0;
  75
  76         if ((val = startswith(option, "cipher="))) {
  77                 r = free_and_strdup(&arg_cipher, val);
  78                 if (r < 0)
  79                         return log_oom();
  80
  81         } else if ((val = startswith(option, "size="))) {
  82
  83                 r = safe_atou(val, &arg_key_size);
  84                 if (r < 0) {
  85                         log_error_errno(r, "Failed to parse %s, ignoring: %m", option);
  86                         return 0;
  87                 }
  88
  89                 if (arg_key_size % 8) {
  90                         log_error("size= not a multiple of 8, ignoring.");
  91                         return 0;
  92                 }
  93
  94                 arg_key_size /= 8;
  95
  96         } else if ((val = startswith(option, "sector-size="))) {
  97
  98 #if HAVE_LIBCRYPTSETUP_SECTOR_SIZE
  99                 r = safe_atou(val, &arg_sector_size);
 100                 if (r < 0) {
 101                         log_error_errno(r, "Failed to parse %s, ignoring: %m", option);
 102                         return 0;
 103                 }
 104
 105                 if (arg_sector_size % 2) {
 106                         log_error("sector-size= not a multiple of 2, ignoring.");
 107                         return 0;
 108                 }
 109
 110                 if (arg_sector_size < CRYPT_SECTOR_SIZE || arg_sector_size > CRYPT_MAX_SECTOR_SIZE) {
 111                         log_error("sector-size= is outside of %u and %u, ignoring.", CRYPT_SECTOR_SIZE, CRYPT_MAX_SECTOR_SIZE);
 112                         return 0;
 113                 }
 114 #else
 115                 log_error("sector-size= is not supported, compiled with old libcryptsetup.");
 116                 return 0;
 117 #endif
 118
 119         } else if ((val = startswith(option, "key-slot="))) {
 120
 121                 arg_type = ANY_LUKS;
 122                 r = safe_atoi(val, &arg_key_slot);
 123                 if (r < 0) {
 124                         log_error_errno(r, "Failed to parse %s, ignoring: %m", option);
 125                         return 0;
 126                 }
 127
 128         } else if ((val = startswith(option, "tcrypt-keyfile="))) {
 129
 130                 arg_type = CRYPT_TCRYPT;
 131                 if (path_is_absolute(val)) {
 132                         if (strv_extend(&arg_tcrypt_keyfiles, val) < 0)
 133                                 return log_oom();
 134                 } else
 135                         log_error("Key file path \"%s\" is not absolute. Ignoring.", val);
 136
 137         } else if ((val = startswith(option, "keyfile-size="))) {
 138
 139                 r = safe_atou(val, &arg_keyfile_size);
 140                 if (r < 0) {
 141                         log_error_errno(r, "Failed to parse %s, ignoring: %m", option);
 142                         return 0;
 143                 }
 144
 145         } else if ((val = startswith(option, "keyfile-offset="))) {
 146                 uint64_t off;
 147
 148                 r = safe_atou64(val, &off);
 149                 if (r < 0) {
 150                         log_error_errno(r, "Failed to parse %s, ignoring: %m", option);
 151                         return 0;
 152                 }
 153
 154                 if ((size_t) off != off) {
 155                         /* https://gitlab.com/cryptsetup/cryptsetup/issues/359 */
 156                         log_error("keyfile-offset= value would truncated to %zu, ignoring.", (size_t) off);
 157                         return 0;
 158                 }
 159
 160                 arg_keyfile_offset = off;
 161
 162         } else if ((val = startswith(option, "hash="))) {
 163                 r = free_and_strdup(&arg_hash, val);
 164                 if (r < 0)
 165                         return log_oom();
 166
 167         } else if ((val = startswith(option, "header="))) {
 168                 arg_type = ANY_LUKS;
 169
 170                 if (!path_is_absolute(val)) {
 171                         log_error("Header path \"%s\" is not absolute, refusing.", val);
 172                         return -EINVAL;
 173                 }
 174
 175                 if (arg_header) {
 176                         log_error("Duplicate header= option, refusing.");
 177                         return -EINVAL;
 178                 }
 179
 180                 arg_header = strdup(val);
 181                 if (!arg_header)
 182                         return log_oom();
 183
 184         } else if ((val = startswith(option, "tries="))) {
 185
 186                 r = safe_atou(val, &arg_tries);
 187                 if (r < 0) {
 188                         log_error_errno(r, "Failed to parse %s, ignoring: %m", option);
 189                         return 0;
 190                 }
 191
 192         } else if (STR_IN_SET(option, "readonly", "read-only"))
 193                 arg_readonly = true;
 194         else if (streq(option, "verify"))
 195                 arg_verify = true;
 196         else if (STR_IN_SET(option, "allow-discards", "discard"))
 197                 arg_discards = true;
 198         else if (streq(option, "luks"))
 199                 arg_type = ANY_LUKS;
 200         else if (streq(option, "tcrypt"))
 201                 arg_type = CRYPT_TCRYPT;
 202         else if (streq(option, "tcrypt-hidden")) {
 203                 arg_type = CRYPT_TCRYPT;
 204                 arg_tcrypt_hidden = true;
 205         } else if (streq(option, "tcrypt-system")) {
 206                 arg_type = CRYPT_TCRYPT;
 207                 arg_tcrypt_system = true;
 208         } else if (streq(option, "tcrypt-veracrypt")) {
 209 #ifdef CRYPT_TCRYPT_VERA_MODES
 210                 arg_type = CRYPT_TCRYPT;
 211                 arg_tcrypt_veracrypt = true;
 212 #else
 213                 log_error("This version of cryptsetup does not support tcrypt-veracrypt; refusing.");
 214                 return -EINVAL;
 215 #endif
 216         } else if (STR_IN_SET(option, "plain", "swap", "tmp"))
 217                 arg_type = CRYPT_PLAIN;
 218         else if ((val = startswith(option, "timeout="))) {
 219
 220                 r = parse_sec_fix_0(val, &arg_timeout);
 221                 if (r < 0) {
 222                         log_error_errno(r, "Failed to parse %s, ignoring: %m", option);
 223                         return 0;
 224                 }
 225
 226         } else if ((val = startswith(option, "offset="))) {
 227
 228                 r = safe_atou64(val, &arg_offset);
 229                 if (r < 0)
 230                         return log_error_errno(r, "Failed to parse %s: %m", option);
 231
 232         } else if ((val = startswith(option, "skip="))) {
 233
 234                 r = safe_atou64(val, &arg_skip);
 235                 if (r < 0)
 236                         return log_error_errno(r, "Failed to parse %s: %m", option);
 237
 238         } else if (!streq(option, "none"))
 239                 log_warning("Encountered unknown /etc/crypttab option '%s', ignoring.", option);
 240
 241         return 0;
 242 }
 243
 244 static int parse_options(const char *options) {
 245         const char *word, *state;
 246         size_t l;
 247         int r;
 248
 249         assert(options);
 250
 251         FOREACH_WORD_SEPARATOR(word, l, options, ",", state) {
 252                 _cleanup_free_ char *o;
 253
 254                 o = strndup(word, l);
 255                 if (!o)
 256                         return -ENOMEM;
 257                 r = parse_one_option(o);
 258                 if (r < 0)
 259                         return r;
 260         }
 261
 262         /* sanity-check options */
 263         if (arg_type != NULL && !streq(arg_type, CRYPT_PLAIN)) {
 264                 if (arg_offset)
 265                       log_warning("offset= ignored with type %s", arg_type);
 266                 if (arg_skip)
 267                       log_warning("skip= ignored with type %s", arg_type);
 268         }
 269
 270         return 0;
 271 }
 272
 273 static char* disk_description(const char *path) {
 274
 275         static const char name_fields[] =
 276                 "ID_PART_ENTRY_NAME\0"
 277                 "DM_NAME\0"
 278                 "ID_MODEL_FROM_DATABASE\0"
 279                 "ID_MODEL\0";
 280
 281         _cleanup_(sd_device_unrefp) sd_device *device = NULL;
 282         struct stat st;
 283         const char *i;
 284         int r;
 285
 286         assert(path);
 287
 288         if (stat(path, &st) < 0)
 289                 return NULL;
 290
 291         if (!S_ISBLK(st.st_mode))
 292                 return NULL;
 293
 294         r = sd_device_new_from_devnum(&device, 'b', st.st_rdev);
 295         if (r < 0)
 296                 return NULL;
 297
 298         NULSTR_FOREACH(i, name_fields) {
 299                 const char *name;
 300
 301                 r = sd_device_get_property_value(device, i, &name);
 302                 if (r >= 0 && !isempty(name))
 303                         return strdup(name);
 304         }
 305
 306         return NULL;
 307 }
 308
 309 static char *disk_mount_point(const char *label) {
 310         _cleanup_free_ char *device = NULL;
 311         _cleanup_endmntent_ FILE *f = NULL;
 312         struct mntent *m;
 313
 314         /* Yeah, we don't support native systemd unit files here for now */
 315
 316         if (asprintf(&device, "/dev/mapper/%s", label) < 0)
 317                 return NULL;
 318
 319         f = setmntent("/etc/fstab", "re");
 320         if (!f)
 321                 return NULL;
 322
 323         while ((m = getmntent(f)))
 324                 if (path_equal(m->mnt_fsname, device))
 325                         return strdup(m->mnt_dir);
 326
 327         return NULL;
 328 }
 329
 330 static int get_password(const char *vol, const char *src, usec_t until, bool accept_cached, char ***ret) {
 331         _cleanup_free_ char *description = NULL, *name_buffer = NULL, *mount_point = NULL, *text = NULL, *disk_path = NULL;
 332         _cleanup_strv_free_erase_ char **passwords = NULL;
 333         const char *name = NULL;
 334         char **p, *id;
 335         int r = 0;
 336
 337         assert(vol);
 338         assert(src);
 339         assert(ret);
 340
 341         description = disk_description(src);
 342         mount_point = disk_mount_point(vol);
 343
 344         disk_path = cescape(src);
 345         if (!disk_path)
 346                 return log_oom();
 347
 348         if (description && streq(vol, description))
 349                 /* If the description string is simply the
 350                  * volume name, then let's not show this
 351                  * twice */
 352                 description = mfree(description);
 353
 354         if (mount_point && description)
 355                 r = asprintf(&name_buffer, "%s (%s) on %s", description, vol, mount_point);
 356         else if (mount_point)
 357                 r = asprintf(&name_buffer, "%s on %s", vol, mount_point);
 358         else if (description)
 359                 r = asprintf(&name_buffer, "%s (%s)", description, vol);
 360
 361         if (r < 0)
 362                 return log_oom();
 363
 364         name = name_buffer ? name_buffer : vol;
 365
 366         if (asprintf(&text, "Please enter passphrase for disk %s!", name) < 0)
 367                 return log_oom();
 368
 369         id = strjoina("cryptsetup:", disk_path);
 370
 371         r = ask_password_auto(text, "drive-harddisk", id, "cryptsetup", until,
 372                               ASK_PASSWORD_PUSH_CACHE | (accept_cached*ASK_PASSWORD_ACCEPT_CACHED),
 373                               &passwords);
 374         if (r < 0)
 375                 return log_error_errno(r, "Failed to query password: %m");
 376
 377         if (arg_verify) {
 378                 _cleanup_strv_free_erase_ char **passwords2 = NULL;
 379
 380                 assert(strv_length(passwords) == 1);
 381
 382                 if (asprintf(&text, "Please enter passphrase for disk %s! (verification)", name) < 0)
 383                         return log_oom();
 384
 385                 id = strjoina("cryptsetup-verification:", disk_path);
 386
 387                 r = ask_password_auto(text, "drive-harddisk", id, "cryptsetup", until, ASK_PASSWORD_PUSH_CACHE, &passwords2);
 388                 if (r < 0)
 389                         return log_error_errno(r, "Failed to query verification password: %m");
 390
 391                 assert(strv_length(passwords2) == 1);
 392
 393                 if (!streq(passwords[0], passwords2[0])) {
 394                         log_warning("Passwords did not match, retrying.");
 395                         return -EAGAIN;
 396                 }
 397         }
 398
 399         strv_uniq(passwords);
 400
 401         STRV_FOREACH(p, passwords) {
 402                 char *c;
 403
 404                 if (strlen(*p)+1 >= arg_key_size)
 405                         continue;
 406
 407                 /* Pad password if necessary */
 408                 c = new(char, arg_key_size);
 409                 if (!c)
 410                         return log_oom();
 411
 412                 strncpy(c, *p, arg_key_size);
 413                 free(*p);
 414                 *p = c;
 415         }
 416
 417         *ret = TAKE_PTR(passwords);
 418
 419         return 0;
 420 }
 421
 422 static int attach_tcrypt(
 423                 struct crypt_device *cd,
 424                 const char *name,
 425                 const char *key_file,
 426                 char **passwords,
 427                 uint32_t flags) {
 428
 429         int r = 0;
 430         _cleanup_free_ char *passphrase = NULL;
 431         struct crypt_params_tcrypt params = {
 432                 .flags = CRYPT_TCRYPT_LEGACY_MODES,
 433                 .keyfiles = (const char **)arg_tcrypt_keyfiles,
 434                 .keyfiles_count = strv_length(arg_tcrypt_keyfiles)
 435         };
 436
 437         assert(cd);
 438         assert(name);
 439         assert(key_file || (passwords && passwords[0]));
 440
 441         if (arg_tcrypt_hidden)
 442                 params.flags |= CRYPT_TCRYPT_HIDDEN_HEADER;
 443
 444         if (arg_tcrypt_system)
 445                 params.flags |= CRYPT_TCRYPT_SYSTEM_HEADER;
 446
 447 #ifdef CRYPT_TCRYPT_VERA_MODES
 448         if (arg_tcrypt_veracrypt)
 449                 params.flags |= CRYPT_TCRYPT_VERA_MODES;
 450 #endif
 451
 452         if (key_file) {
 453                 r = read_one_line_file(key_file, &passphrase);
 454                 if (r < 0) {
 455                         log_error_errno(r, "Failed to read password file '%s': %m", key_file);
 456                         return -EAGAIN;
 457                 }
 458
 459                 params.passphrase = passphrase;
 460         } else
 461                 params.passphrase = passwords[0];
 462         params.passphrase_size = strlen(params.passphrase);
 463
 464         r = crypt_load(cd, CRYPT_TCRYPT, &params);
 465         if (r < 0) {
 466                 if (key_file && r == -EPERM) {
 467                         log_error("Failed to activate using password file '%s'.", key_file);
 468                         return -EAGAIN;
 469                 }
 470                 return r;
 471         }
 472
 473         return crypt_activate_by_volume_key(cd, name, NULL, 0, flags);
 474 }
 475
 476 static int attach_luks_or_plain(struct crypt_device *cd,
 477                                 const char *name,
 478                                 const char *key_file,
 479                                 const char *data_device,
 480                                 char **passwords,
 481                                 uint32_t flags) {
 482         int r = 0;
 483         bool pass_volume_key = false;
 484
 485         assert(cd);
 486         assert(name);
 487         assert(key_file || passwords);
 488
 489         if (!arg_type || STR_IN_SET(arg_type, ANY_LUKS, CRYPT_LUKS1)) {
 490                 r = crypt_load(cd, CRYPT_LUKS, NULL);
 491                 if (r < 0) {
 492                         log_error("crypt_load() failed on device %s.\n", crypt_get_device_name(cd));
 493                         return r;
 494                 }
 495
 496                 if (data_device)
 497                         r = crypt_set_data_device(cd, data_device);
 498         }
 499
 500         if ((!arg_type && r < 0) || streq_ptr(arg_type, CRYPT_PLAIN)) {
 501                 struct crypt_params_plain params = {
 502                         .offset = arg_offset,
 503                         .skip = arg_skip,
 504 #if HAVE_LIBCRYPTSETUP_SECTOR_SIZE
 505                         .sector_size = arg_sector_size,
 506 #endif
 507                 };
 508                 const char *cipher, *cipher_mode;
 509                 _cleanup_free_ char *truncated_cipher = NULL;
 510
 511                 if (arg_hash) {
 512                         /* plain isn't a real hash type. it just means "use no hash" */
 513                         if (!streq(arg_hash, "plain"))
 514                                 params.hash = arg_hash;
 515                 } else if (!key_file)
 516                         /* for CRYPT_PLAIN, the behaviour of cryptsetup
 517                          * package is to not hash when a key file is provided */
 518                         params.hash = "ripemd160";
 519
 520                 if (arg_cipher) {
 521                         size_t l;
 522
 523                         l = strcspn(arg_cipher, "-");
 524                         truncated_cipher = strndup(arg_cipher, l);
 525                         if (!truncated_cipher)
 526                                 return log_oom();
 527
 528                         cipher = truncated_cipher;
 529                         cipher_mode = arg_cipher[l] ? arg_cipher+l+1 : "plain";
 530                 } else {
 531                         cipher = "aes";
 532                         cipher_mode = "cbc-essiv:sha256";
 533                 }
 534
 535                 /* for CRYPT_PLAIN limit reads
 536                  * from keyfile to key length, and
 537                  * ignore keyfile-size */
 538                 arg_keyfile_size = arg_key_size;
 539
 540                 /* In contrast to what the name
 541                  * crypt_setup() might suggest this
 542                  * doesn't actually format anything,
 543                  * it just configures encryption
 544                  * parameters when used for plain
 545                  * mode. */
 546                 r = crypt_format(cd, CRYPT_PLAIN, cipher, cipher_mode, NULL, NULL, arg_keyfile_size, &params);
 547
 548                 /* hash == NULL implies the user passed "plain" */
 549                 pass_volume_key = (params.hash == NULL);
 550         }
 551
 552         if (r < 0)
 553                 return log_error_errno(r, "Loading of cryptographic parameters failed: %m");
 554
 555         log_info("Set cipher %s, mode %s, key size %i bits for device %s.",
 556                  crypt_get_cipher(cd),
 557                  crypt_get_cipher_mode(cd),
 558                  crypt_get_volume_key_size(cd)*8,
 559                  crypt_get_device_name(cd));
 560
 561         if (key_file) {
 562                 r = crypt_activate_by_keyfile_offset(cd, name, arg_key_slot, key_file, arg_keyfile_size, arg_keyfile_offset, flags);
 563                 if (r < 0) {
 564                         log_error_errno(r, "Failed to activate with key file '%s': %m", key_file);
 565                         return -EAGAIN;
 566                 }
 567         } else {
 568                 char **p;
 569
 570                 STRV_FOREACH(p, passwords) {
 571                         if (pass_volume_key)
 572                                 r = crypt_activate_by_volume_key(cd, name, *p, arg_key_size, flags);
 573                         else
 574                                 r = crypt_activate_by_passphrase(cd, name, arg_key_slot, *p, strlen(*p), flags);
 575
 576                         if (r >= 0)
 577                                 break;
 578                 }
 579         }
 580
 581         return r;
 582 }
 583
 584 static int help(void) {
 585         _cleanup_free_ char *link = NULL;
 586         int r;
 587
 588         r = terminal_urlify_man("systemd-cryptsetup@.service", "8", &link);
 589         if (r < 0)
 590                 return log_oom();
 591
 592         printf("%s attach VOLUME SOURCEDEVICE [PASSWORD] [OPTIONS]\n"
 593                "%s detach VOLUME\n\n"
 594                "Attaches or detaches an encrypted block device.\n"
 595                "\nSee the %s for details.\n"
 596                , program_invocation_short_name
 597                , program_invocation_short_name
 598                , link
 599         );
 600
 601         return 0;
 602 }
 603
 604 int main(int argc, char *argv[]) {
 605         _cleanup_(crypt_freep) struct crypt_device *cd = NULL;
 606         int r = -EINVAL;
 607
 608         if (argc <= 1) {
 609                 r = help();
 610                 goto finish;
 611         }
 612
 613         if (argc < 3) {
 614                 log_error("This program requires at least two arguments.");
 615                 goto finish;
 616         }
 617
 618         log_set_target(LOG_TARGET_AUTO);
 619         log_parse_environment();
 620         log_open();
 621
 622         umask(0022);
 623
 624         if (streq(argv[1], "attach")) {
 625                 uint32_t flags = 0;
 626                 unsigned tries;
 627                 usec_t until;
 628                 crypt_status_info status;
 629                 const char *key_file = NULL;
 630
 631                 /* Arguments: systemd-cryptsetup attach VOLUME SOURCE-DEVICE [PASSWORD] [OPTIONS] */
 632
 633                 if (argc < 4) {
 634                         log_error("attach requires at least two arguments.");
 635                         goto finish;
 636                 }
 637
 638                 if (argc >= 5 &&
 639                     argv[4][0] &&
 640                     !streq(argv[4], "-") &&
 641                     !streq(argv[4], "none")) {
 642
 643                         if (!path_is_absolute(argv[4]))
 644                                 log_error("Password file path '%s' is not absolute. Ignoring.", argv[4]);
 645                         else
 646                                 key_file = argv[4];
 647                 }
 648
 649                 if (argc >= 6 && argv[5][0] && !streq(argv[5], "-")) {
 650                         if (parse_options(argv[5]) < 0)
 651                                 goto finish;
 652                 }
 653
 654                 /* A delicious drop of snake oil */
 655                 mlockall(MCL_FUTURE);
 656
 657                 if (arg_header) {
 658                         log_debug("LUKS header: %s", arg_header);
 659                         r = crypt_init(&cd, arg_header);
 660                 } else
 661                         r = crypt_init(&cd, argv[3]);
 662                 if (r < 0) {
 663                         log_error_errno(r, "crypt_init() failed: %m");
 664                         goto finish;
 665                 }
 666
 667                 crypt_set_log_callback(cd, cryptsetup_log_glue, NULL);
 668
 669                 status = crypt_status(cd, argv[2]);
 670                 if (IN_SET(status, CRYPT_ACTIVE, CRYPT_BUSY)) {
 671                         log_info("Volume %s already active.", argv[2]);
 672                         r = 0;
 673                         goto finish;
 674                 }
 675
 676                 if (arg_readonly)
 677                         flags |= CRYPT_ACTIVATE_READONLY;
 678
 679                 if (arg_discards)
 680                         flags |= CRYPT_ACTIVATE_ALLOW_DISCARDS;
 681
 682                 if (arg_timeout == USEC_INFINITY)
 683                         until = 0;
 684                 else
 685                         until = now(CLOCK_MONOTONIC) + arg_timeout;
 686
 687                 arg_key_size = (arg_key_size > 0 ? arg_key_size : (256 / 8));
 688
 689                 if (key_file) {
 690                         struct stat st;
 691
 692                         /* Ideally we'd do this on the open fd, but since this is just a
 693                          * warning it's OK to do this in two steps. */
 694                         if (stat(key_file, &st) >= 0 && S_ISREG(st.st_mode) && (st.st_mode & 0005))
 695                                 log_warning("Key file %s is world-readable. This is not a good idea!", key_file);
 696                 }
 697
 698                 for (tries = 0; arg_tries == 0 || tries < arg_tries; tries++) {
 699                         _cleanup_strv_free_erase_ char **passwords = NULL;
 700
 701                         if (!key_file) {
 702                                 r = get_password(argv[2], argv[3], until, tries == 0 && !arg_verify, &passwords);
 703                                 if (r == -EAGAIN)
 704                                         continue;
 705                                 if (r < 0)
 706                                         goto finish;
 707                         }
 708
 709                         if (streq_ptr(arg_type, CRYPT_TCRYPT))
 710                                 r = attach_tcrypt(cd, argv[2], key_file, passwords, flags);
 711                         else
 712                                 r = attach_luks_or_plain(cd,
 713                                                          argv[2],
 714                                                          key_file,
 715                                                          arg_header ? argv[3] : NULL,
 716                                                          passwords,
 717                                                          flags);
 718                         if (r >= 0)
 719                                 break;
 720                         if (r == -EAGAIN) {
 721                                 key_file = NULL;
 722                                 continue;
 723                         }
 724                         if (r != -EPERM) {
 725                                 log_error_errno(r, "Failed to activate: %m");
 726                                 goto finish;
 727                         }
 728
 729                         log_warning("Invalid passphrase.");
 730                 }
 731
 732                 if (arg_tries != 0 && tries >= arg_tries) {
 733                         log_error("Too many attempts; giving up.");
 734                         r = -EPERM;
 735                         goto finish;
 736                 }
 737
 738         } else if (streq(argv[1], "detach")) {
 739
 740                 r = crypt_init_by_name(&cd, argv[2]);
 741                 if (r == -ENODEV) {
 742                         log_info("Volume %s already inactive.", argv[2]);
 743                         r = 0;
 744                         goto finish;
 745                 }
 746                 if (r < 0) {
 747                         log_error_errno(r, "crypt_init_by_name() failed: %m");
 748                         goto finish;
 749                 }
 750
 751                 crypt_set_log_callback(cd, cryptsetup_log_glue, NULL);
 752
 753                 r = crypt_deactivate(cd, argv[2]);
 754                 if (r < 0) {
 755                         log_error_errno(r, "Failed to deactivate: %m");
 756                         goto finish;
 757                 }
 758
 759         } else {
 760                 log_error("Unknown verb %s.", argv[1]);
 761                 goto finish;
 762         }
 763
 764         r = 0;
 765
 766 finish:
 767         free(arg_cipher);
 768         free(arg_hash);
 769         free(arg_header);
 770         strv_free(arg_tcrypt_keyfiles);
 771
 772         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 773 }