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