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