src/cryptsetup/cryptsetup.c

   1 /***
   2   This file is part of systemd.
   3
   4   Copyright 2010 Lennart Poettering
   5
   6   systemd is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as published by
   8   the Free Software Foundation; either version 2.1 of the License, or
   9   (at your option) any later version.
  10
  11   systemd is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  18 ***/
  19
  20 #include <errno.h>
  21 #include <libcryptsetup.h>
  22 #include <mntent.h>
  23 #include <string.h>
  24 #include <sys/mman.h>
  25
  26 #include "sd-device.h"
  27
  28 #include "alloc-util.h"
  29 #include "ask-password-api.h"
  30 #include "device-util.h"
  31 #include "escape.h"
  32 #include "fileio.h"
  33 #include "log.h"
  34 #include "mount-util.h"
  35 #include "parse-util.h"
  36 #include "path-util.h"
  37 #include "string-util.h"
  38 #include "strv.h"
  39 #include "util.h"
  40
  41 static const char *arg_type = NULL; /* CRYPT_LUKS1, CRYPT_TCRYPT or CRYPT_PLAIN */
  42 static char *arg_cipher = NULL;
  43 static unsigned arg_key_size = 0;
  44 static int arg_key_slot = CRYPT_ANY_SLOT;
  45 static unsigned arg_keyfile_size = 0;
  46 static unsigned arg_keyfile_offset = 0;
  47 static char *arg_hash = NULL;
  48 static char *arg_header = NULL;
  49 static unsigned arg_tries = 3;
  50 static bool arg_readonly = false;
  51 static bool arg_verify = false;
  52 static bool arg_discards = false;
  53 static bool arg_tcrypt_hidden = false;
  54 static bool arg_tcrypt_system = false;
  55 static char **arg_tcrypt_keyfiles = NULL;
  56 static uint64_t arg_offset = 0;
  57 static uint64_t arg_skip = 0;
  58 static usec_t arg_timeout = 0;
  59
  60 /* Options Debian's crypttab knows we don't:
  61
  62     precheck=
  63     check=
  64     checkargs=
  65     noearly=
  66     loud=
  67     keyscript=
  68 */
  69
  70 static int parse_one_option(const char *option) {
  71         assert(option);
  72
  73         /* Handled outside of this tool */
  74         if (STR_IN_SET(option, "noauto", "auto", "nofail", "fail"))
  75                 return 0;
  76
  77         if (startswith(option, "cipher=")) {
  78                 char *t;
  79
  80                 t = strdup(option+7);
  81                 if (!t)
  82                         return log_oom();
  83
  84                 free(arg_cipher);
  85                 arg_cipher = t;
  86
  87         } else if (startswith(option, "size=")) {
  88
  89                 if (safe_atou(option+5, &arg_key_size) < 0) {
  90                         log_error("size= parse failure, ignoring.");
  91                         return 0;
  92                 }
  93
  94                 if (arg_key_size % 8) {
  95                         log_error("size= not a multiple of 8, ignoring.");
  96                         return 0;
  97                 }
  98
  99                 arg_key_size /= 8;
 100
 101         } else if (startswith(option, "key-slot=")) {
 102
 103                 arg_type = CRYPT_LUKS1;
 104                 if (safe_atoi(option+9, &arg_key_slot) < 0) {
 105                         log_error("key-slot= parse failure, ignoring.");
 106                         return 0;
 107                 }
 108
 109         } else if (startswith(option, "tcrypt-keyfile=")) {
 110
 111                 arg_type = CRYPT_TCRYPT;
 112                 if (path_is_absolute(option+15)) {
 113                         if (strv_extend(&arg_tcrypt_keyfiles, option + 15) < 0)
 114                                 return log_oom();
 115                 } else
 116                         log_error("Key file path '%s' is not absolute. Ignoring.", option+15);
 117
 118         } else if (startswith(option, "keyfile-size=")) {
 119
 120                 if (safe_atou(option+13, &arg_keyfile_size) < 0) {
 121                         log_error("keyfile-size= parse failure, ignoring.");
 122                         return 0;
 123                 }
 124
 125         } else if (startswith(option, "keyfile-offset=")) {
 126
 127                 if (safe_atou(option+15, &arg_keyfile_offset) < 0) {
 128                         log_error("keyfile-offset= parse failure, ignoring.");
 129                         return 0;
 130                 }
 131
 132         } else if (startswith(option, "hash=")) {
 133                 char *t;
 134
 135                 t = strdup(option+5);
 136                 if (!t)
 137                         return log_oom();
 138
 139                 free(arg_hash);
 140                 arg_hash = t;
 141
 142         } else if (startswith(option, "header=")) {
 143                 arg_type = CRYPT_LUKS1;
 144
 145                 if (!path_is_absolute(option+7)) {
 146                         log_error("Header path '%s' is not absolute, refusing.", option+7);
 147                         return -EINVAL;
 148                 }
 149
 150                 if (arg_header) {
 151                         log_error("Duplicate header= options, refusing.");
 152                         return -EINVAL;
 153                 }
 154
 155                 arg_header = strdup(option+7);
 156                 if (!arg_header)
 157                         return log_oom();
 158
 159         } else if (startswith(option, "tries=")) {
 160
 161                 if (safe_atou(option+6, &arg_tries) < 0) {
 162                         log_error("tries= parse failure, ignoring.");
 163                         return 0;
 164                 }
 165
 166         } else if (STR_IN_SET(option, "readonly", "read-only"))
 167                 arg_readonly = true;
 168         else if (streq(option, "verify"))
 169                 arg_verify = true;
 170         else if (STR_IN_SET(option, "allow-discards", "discard"))
 171                 arg_discards = true;
 172         else if (streq(option, "luks"))
 173                 arg_type = CRYPT_LUKS1;
 174         else if (streq(option, "tcrypt"))
 175                 arg_type = CRYPT_TCRYPT;
 176         else if (streq(option, "tcrypt-hidden")) {
 177                 arg_type = CRYPT_TCRYPT;
 178                 arg_tcrypt_hidden = true;
 179         } else if (streq(option, "tcrypt-system")) {
 180                 arg_type = CRYPT_TCRYPT;
 181                 arg_tcrypt_system = true;
 182         } else if (STR_IN_SET(option, "plain", "swap", "tmp"))
 183                 arg_type = CRYPT_PLAIN;
 184         else if (startswith(option, "timeout=")) {
 185
 186                 if (parse_sec(option+8, &arg_timeout) < 0) {
 187                         log_error("timeout= parse failure, ignoring.");
 188                         return 0;
 189                 }
 190
 191         } else if (startswith(option, "offset=")) {
 192
 193                 if (safe_atou64(option+7, &arg_offset) < 0) {
 194                         log_error("offset= parse failure, refusing.");
 195                         return -EINVAL;
 196                 }
 197
 198         } else if (startswith(option, "skip=")) {
 199
 200                 if (safe_atou64(option+5, &arg_skip) < 0) {
 201                         log_error("skip= parse failure, refusing.");
 202                         return -EINVAL;
 203                 }
 204
 205         } else if (!streq(option, "none"))
 206                 log_error("Encountered unknown /etc/crypttab option '%s', ignoring.", option);
 207
 208         return 0;
 209 }
 210
 211 static int parse_options(const char *options) {
 212         const char *word, *state;
 213         size_t l;
 214         int r;
 215
 216         assert(options);
 217
 218         FOREACH_WORD_SEPARATOR(word, l, options, ",", state) {
 219                 _cleanup_free_ char *o;
 220
 221                 o = strndup(word, l);
 222                 if (!o)
 223                         return -ENOMEM;
 224                 r = parse_one_option(o);
 225                 if (r < 0)
 226                         return r;
 227         }
 228
 229         /* sanity-check options */
 230         if (arg_type != NULL && !streq(arg_type, CRYPT_PLAIN)) {
 231                 if (arg_offset)
 232                       log_warning("offset= ignored with type %s", arg_type);
 233                 if (arg_skip)
 234                       log_warning("skip= ignored with type %s", arg_type);
 235         }
 236
 237         return 0;
 238 }
 239
 240 static void log_glue(int level, const char *msg, void *usrptr) {
 241         log_debug("%s", msg);
 242 }
 243
 244 static int disk_major_minor(const char *path, char **ret) {
 245         struct stat st;
 246
 247         assert(path);
 248
 249         if (stat(path, &st) < 0)
 250                 return -errno;
 251
 252         if (!S_ISBLK(st.st_mode))
 253                 return -EINVAL;
 254
 255         if (asprintf(ret, "/dev/block/%d:%d", major(st.st_rdev), minor(st.st_rdev)) < 0)
 256                 return -errno;
 257
 258         return 0;
 259 }
 260
 261 static char* disk_description(const char *path) {
 262
 263         static const char name_fields[] =
 264                 "ID_PART_ENTRY_NAME\0"
 265                 "DM_NAME\0"
 266                 "ID_MODEL_FROM_DATABASE\0"
 267                 "ID_MODEL\0";
 268
 269         _cleanup_(sd_device_unrefp) sd_device *device = NULL;
 270         struct stat st;
 271         const char *i;
 272         int r;
 273
 274         assert(path);
 275
 276         if (stat(path, &st) < 0)
 277                 return NULL;
 278
 279         if (!S_ISBLK(st.st_mode))
 280                 return NULL;
 281
 282         r = sd_device_new_from_devnum(&device, 'b', st.st_rdev);
 283         if (r < 0)
 284                 return NULL;
 285
 286         NULSTR_FOREACH(i, name_fields) {
 287                 const char *name;
 288
 289                 r = sd_device_get_property_value(device, i, &name);
 290                 if (r >= 0 && !isempty(name))
 291                         return strdup(name);
 292         }
 293
 294         return NULL;
 295 }
 296
 297 static char *disk_mount_point(const char *label) {
 298         _cleanup_free_ char *device = NULL;
 299         _cleanup_endmntent_ FILE *f = NULL;
 300         struct mntent *m;
 301
 302         /* Yeah, we don't support native systemd unit files here for now */
 303
 304         if (asprintf(&device, "/dev/mapper/%s", label) < 0)
 305                 return NULL;
 306
 307         f = setmntent("/etc/fstab", "r");
 308         if (!f)
 309                 return NULL;
 310
 311         while ((m = getmntent(f)))
 312                 if (path_equal(m->mnt_fsname, device))
 313                         return strdup(m->mnt_dir);
 314
 315         return NULL;
 316 }
 317
 318 static int get_password(const char *vol, const char *src, usec_t until, bool accept_cached, char ***ret) {
 319         _cleanup_free_ char *description = NULL, *name_buffer = NULL, *mount_point = NULL, *maj_min = NULL, *text = NULL, *escaped_name = NULL;
 320         _cleanup_strv_free_erase_ char **passwords = NULL;
 321         const char *name = NULL;
 322         char **p, *id;
 323         int r = 0;
 324
 325         assert(vol);
 326         assert(src);
 327         assert(ret);
 328
 329         description = disk_description(src);
 330         mount_point = disk_mount_point(vol);
 331
 332         if (description && streq(vol, description))
 333                 /* If the description string is simply the
 334                  * volume name, then let's not show this
 335                  * twice */
 336                 description = mfree(description);
 337
 338         if (mount_point && description)
 339                 r = asprintf(&name_buffer, "%s (%s) on %s", description, vol, mount_point);
 340         else if (mount_point)
 341                 r = asprintf(&name_buffer, "%s on %s", vol, mount_point);
 342         else if (description)
 343                 r = asprintf(&name_buffer, "%s (%s)", description, vol);
 344
 345         if (r < 0)
 346                 return log_oom();
 347
 348         name = name_buffer ? name_buffer : vol;
 349
 350         if (asprintf(&text, "Please enter passphrase for disk %s!", name) < 0)
 351                 return log_oom();
 352
 353         if (src)
 354                 (void) disk_major_minor(src, &maj_min);
 355
 356         if (maj_min) {
 357                 escaped_name = maj_min;
 358                 maj_min = NULL;
 359         } else
 360                 escaped_name = cescape(name);
 361
 362         if (!escaped_name)
 363                 return log_oom();
 364
 365         id = strjoina("cryptsetup:", escaped_name);
 366
 367         r = ask_password_auto(text, "drive-harddisk", id, "cryptsetup", until,
 368                               ASK_PASSWORD_PUSH_CACHE | (accept_cached*ASK_PASSWORD_ACCEPT_CACHED),
 369                               &passwords);
 370         if (r < 0)
 371                 return log_error_errno(r, "Failed to query password: %m");
 372
 373         if (arg_verify) {
 374                 _cleanup_strv_free_erase_ char **passwords2 = NULL;
 375
 376                 assert(strv_length(passwords) == 1);
 377
 378                 if (asprintf(&text, "Please enter passphrase for disk %s! (verification)", name) < 0)
 379                         return log_oom();
 380
 381                 id = strjoina("cryptsetup-verification:", escaped_name);
 382
 383                 r = ask_password_auto(text, "drive-harddisk", id, "cryptsetup", until, ASK_PASSWORD_PUSH_CACHE, &passwords2);
 384                 if (r < 0)
 385                         return log_error_errno(r, "Failed to query verification password: %m");
 386
 387                 assert(strv_length(passwords2) == 1);
 388
 389                 if (!streq(passwords[0], passwords2[0])) {
 390                         log_warning("Passwords did not match, retrying.");
 391                         return -EAGAIN;
 392                 }
 393         }
 394
 395         strv_uniq(passwords);
 396
 397         STRV_FOREACH(p, passwords) {
 398                 char *c;
 399
 400                 if (strlen(*p)+1 >= arg_key_size)
 401                         continue;
 402
 403                 /* Pad password if necessary */
 404                 c = new(char, arg_key_size);
 405                 if (!c)
 406                         return log_oom();
 407
 408                 strncpy(c, *p, arg_key_size);
 409                 free(*p);
 410                 *p = c;
 411         }
 412
 413         *ret = passwords;
 414         passwords = NULL;
 415
 416         return 0;
 417 }
 418
 419 static int attach_tcrypt(
 420                 struct crypt_device *cd,
 421                 const char *name,
 422                 const char *key_file,
 423                 char **passwords,
 424                 uint32_t flags) {
 425
 426         int r = 0;
 427         _cleanup_free_ char *passphrase = NULL;
 428         struct crypt_params_tcrypt params = {
 429                 .flags = CRYPT_TCRYPT_LEGACY_MODES,
 430                 .keyfiles = (const char **)arg_tcrypt_keyfiles,
 431                 .keyfiles_count = strv_length(arg_tcrypt_keyfiles)
 432         };
 433
 434         assert(cd);
 435         assert(name);
 436         assert(key_file || (passwords && passwords[0]));
 437
 438         if (arg_tcrypt_hidden)
 439                 params.flags |= CRYPT_TCRYPT_HIDDEN_HEADER;
 440
 441         if (arg_tcrypt_system)
 442                 params.flags |= CRYPT_TCRYPT_SYSTEM_HEADER;
 443
 444         if (key_file) {
 445                 r = read_one_line_file(key_file, &passphrase);
 446                 if (r < 0) {
 447                         log_error_errno(r, "Failed to read password file '%s': %m", key_file);
 448                         return -EAGAIN;
 449                 }
 450
 451                 params.passphrase = passphrase;
 452         } else
 453                 params.passphrase = passwords[0];
 454         params.passphrase_size = strlen(params.passphrase);
 455
 456         r = crypt_load(cd, CRYPT_TCRYPT, &params);
 457         if (r < 0) {
 458                 if (key_file && r == -EPERM) {
 459                         log_error("Failed to activate using password file '%s'.", key_file);
 460                         return -EAGAIN;
 461                 }
 462                 return r;
 463         }
 464
 465         return crypt_activate_by_volume_key(cd, name, NULL, 0, flags);
 466 }
 467
 468 static int attach_luks_or_plain(struct crypt_device *cd,
 469                                 const char *name,
 470                                 const char *key_file,
 471                                 const char *data_device,
 472                                 char **passwords,
 473                                 uint32_t flags) {
 474         int r = 0;
 475         bool pass_volume_key = false;
 476
 477         assert(cd);
 478         assert(name);
 479         assert(key_file || passwords);
 480
 481         if (!arg_type || streq(arg_type, CRYPT_LUKS1)) {
 482                 r = crypt_load(cd, CRYPT_LUKS1, NULL);
 483                 if (r < 0) {
 484                         log_error("crypt_load() failed on device %s.\n", crypt_get_device_name(cd));
 485                         return r;
 486                 }
 487
 488                 if (data_device)
 489                         r = crypt_set_data_device(cd, data_device);
 490         }
 491
 492         if ((!arg_type && r < 0) || streq_ptr(arg_type, CRYPT_PLAIN)) {
 493                 struct crypt_params_plain params = {
 494                         .offset = arg_offset,
 495                         .skip = arg_skip,
 496                 };
 497                 const char *cipher, *cipher_mode;
 498                 _cleanup_free_ char *truncated_cipher = NULL;
 499
 500                 if (arg_hash) {
 501                         /* plain isn't a real hash type. it just means "use no hash" */
 502                         if (!streq(arg_hash, "plain"))
 503                                 params.hash = arg_hash;
 504                 } else if (!key_file)
 505                         /* for CRYPT_PLAIN, the behaviour of cryptsetup
 506                          * package is to not hash when a key file is provided */
 507                         params.hash = "ripemd160";
 508
 509                 if (arg_cipher) {
 510                         size_t l;
 511
 512                         l = strcspn(arg_cipher, "-");
 513                         truncated_cipher = strndup(arg_cipher, l);
 514                         if (!truncated_cipher)
 515                                 return log_oom();
 516
 517                         cipher = truncated_cipher;
 518                         cipher_mode = arg_cipher[l] ? arg_cipher+l+1 : "plain";
 519                 } else {
 520                         cipher = "aes";
 521                         cipher_mode = "cbc-essiv:sha256";
 522                 }
 523
 524                 /* for CRYPT_PLAIN limit reads
 525                  * from keyfile to key length, and
 526                  * ignore keyfile-size */
 527                 arg_keyfile_size = arg_key_size;
 528
 529                 /* In contrast to what the name
 530                  * crypt_setup() might suggest this
 531                  * doesn't actually format anything,
 532                  * it just configures encryption
 533                  * parameters when used for plain
 534                  * mode. */
 535                 r = crypt_format(cd, CRYPT_PLAIN, cipher, cipher_mode, NULL, NULL, arg_keyfile_size, &params);
 536
 537                 /* hash == NULL implies the user passed "plain" */
 538                 pass_volume_key = (params.hash == NULL);
 539         }
 540
 541         if (r < 0)
 542                 return log_error_errno(r, "Loading of cryptographic parameters failed: %m");
 543
 544         log_info("Set cipher %s, mode %s, key size %i bits for device %s.",
 545                  crypt_get_cipher(cd),
 546                  crypt_get_cipher_mode(cd),
 547                  crypt_get_volume_key_size(cd)*8,
 548                  crypt_get_device_name(cd));
 549
 550         if (key_file) {
 551                 r = crypt_activate_by_keyfile_offset(cd, name, arg_key_slot, key_file, arg_keyfile_size, arg_keyfile_offset, flags);
 552                 if (r < 0) {
 553                         log_error_errno(r, "Failed to activate with key file '%s': %m", key_file);
 554                         return -EAGAIN;
 555                 }
 556         } else {
 557                 char **p;
 558
 559                 STRV_FOREACH(p, passwords) {
 560                         if (pass_volume_key)
 561                                 r = crypt_activate_by_volume_key(cd, name, *p, arg_key_size, flags);
 562                         else
 563                                 r = crypt_activate_by_passphrase(cd, name, arg_key_slot, *p, strlen(*p), flags);
 564
 565                         if (r >= 0)
 566                                 break;
 567                 }
 568         }
 569
 570         return r;
 571 }
 572
 573 static int help(void) {
 574
 575         printf("%s attach VOLUME SOURCEDEVICE [PASSWORD] [OPTIONS]\n"
 576                "%s detach VOLUME\n\n"
 577                "Attaches or detaches an encrypted block device.\n",
 578                program_invocation_short_name,
 579                program_invocation_short_name);
 580
 581         return 0;
 582 }
 583
 584 int main(int argc, char *argv[]) {
 585         int r = EXIT_FAILURE;
 586         struct crypt_device *cd = NULL;
 587
 588         if (argc <= 1) {
 589                 help();
 590                 return EXIT_SUCCESS;
 591         }
 592
 593         if (argc < 3) {
 594                 log_error("This program requires at least two arguments.");
 595                 return EXIT_FAILURE;
 596         }
 597
 598         log_set_target(LOG_TARGET_AUTO);
 599         log_parse_environment();
 600         log_open();
 601
 602         umask(0022);
 603
 604         if (streq(argv[1], "attach")) {
 605                 uint32_t flags = 0;
 606                 int k;
 607                 unsigned tries;
 608                 usec_t until;
 609                 crypt_status_info status;
 610                 const char *key_file = NULL;
 611
 612                 /* Arguments: systemd-cryptsetup attach VOLUME SOURCE-DEVICE [PASSWORD] [OPTIONS] */
 613
 614                 if (argc < 4) {
 615                         log_error("attach requires at least two arguments.");
 616                         goto finish;
 617                 }
 618
 619                 if (argc >= 5 &&
 620                     argv[4][0] &&
 621                     !streq(argv[4], "-") &&
 622                     !streq(argv[4], "none")) {
 623
 624                         if (!path_is_absolute(argv[4]))
 625                                 log_error("Password file path '%s' is not absolute. Ignoring.", argv[4]);
 626                         else
 627                                 key_file = argv[4];
 628                 }
 629
 630                 if (argc >= 6 && argv[5][0] && !streq(argv[5], "-")) {
 631                         if (parse_options(argv[5]) < 0)
 632                                 goto finish;
 633                 }
 634
 635                 /* A delicious drop of snake oil */
 636                 mlockall(MCL_FUTURE);
 637
 638                 if (arg_header) {
 639                         log_debug("LUKS header: %s", arg_header);
 640                         k = crypt_init(&cd, arg_header);
 641                 } else
 642                         k = crypt_init(&cd, argv[3]);
 643                 if (k) {
 644                         log_error_errno(k, "crypt_init() failed: %m");
 645                         goto finish;
 646                 }
 647
 648                 crypt_set_log_callback(cd, log_glue, NULL);
 649
 650                 status = crypt_status(cd, argv[2]);
 651                 if (status == CRYPT_ACTIVE || status == CRYPT_BUSY) {
 652                         log_info("Volume %s already active.", argv[2]);
 653                         r = EXIT_SUCCESS;
 654                         goto finish;
 655                 }
 656
 657                 if (arg_readonly)
 658                         flags |= CRYPT_ACTIVATE_READONLY;
 659
 660                 if (arg_discards)
 661                         flags |= CRYPT_ACTIVATE_ALLOW_DISCARDS;
 662
 663                 if (arg_timeout > 0)
 664                         until = now(CLOCK_MONOTONIC) + arg_timeout;
 665                 else
 666                         until = 0;
 667
 668                 arg_key_size = (arg_key_size > 0 ? arg_key_size : (256 / 8));
 669
 670                 if (key_file) {
 671                         struct stat st;
 672
 673                         /* Ideally we'd do this on the open fd, but since this is just a
 674                          * warning it's OK to do this in two steps. */
 675                         if (stat(key_file, &st) >= 0 && S_ISREG(st.st_mode) && (st.st_mode & 0005))
 676                                 log_warning("Key file %s is world-readable. This is not a good idea!", key_file);
 677                 }
 678
 679                 for (tries = 0; arg_tries == 0 || tries < arg_tries; tries++) {
 680                         _cleanup_strv_free_erase_ char **passwords = NULL;
 681
 682                         if (!key_file) {
 683                                 k = get_password(argv[2], argv[3], until, tries == 0 && !arg_verify, &passwords);
 684                                 if (k == -EAGAIN)
 685                                         continue;
 686                                 else if (k < 0)
 687                                         goto finish;
 688                         }
 689
 690                         if (streq_ptr(arg_type, CRYPT_TCRYPT))
 691                                 k = attach_tcrypt(cd, argv[2], key_file, passwords, flags);
 692                         else
 693                                 k = attach_luks_or_plain(cd,
 694                                                          argv[2],
 695                                                          key_file,
 696                                                          arg_header ? argv[3] : NULL,
 697                                                          passwords,
 698                                                          flags);
 699                         if (k >= 0)
 700                                 break;
 701                         else if (k == -EAGAIN) {
 702                                 key_file = NULL;
 703                                 continue;
 704                         } else if (k != -EPERM) {
 705                                 log_error_errno(k, "Failed to activate: %m");
 706                                 goto finish;
 707                         }
 708
 709                         log_warning("Invalid passphrase.");
 710                 }
 711
 712                 if (arg_tries != 0 && tries >= arg_tries) {
 713                         log_error("Too many attempts; giving up.");
 714                         r = EXIT_FAILURE;
 715                         goto finish;
 716                 }
 717
 718         } else if (streq(argv[1], "detach")) {
 719                 int k;
 720
 721                 k = crypt_init_by_name(&cd, argv[2]);
 722                 if (k) {
 723                         log_error_errno(k, "crypt_init() failed: %m");
 724                         goto finish;
 725                 }
 726
 727                 crypt_set_log_callback(cd, log_glue, NULL);
 728
 729                 k = crypt_deactivate(cd, argv[2]);
 730                 if (k < 0) {
 731                         log_error_errno(k, "Failed to deactivate: %m");
 732                         goto finish;
 733                 }
 734
 735         } else {
 736                 log_error("Unknown verb %s.", argv[1]);
 737                 goto finish;
 738         }
 739
 740         r = EXIT_SUCCESS;
 741
 742 finish:
 743
 744         if (cd)
 745                 crypt_free(cd);
 746
 747         free(arg_cipher);
 748         free(arg_hash);
 749         free(arg_header);
 750         strv_free(arg_tcrypt_keyfiles);
 751
 752         return r;
 753 }