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         static const char name_fields[] =
 275                 "ID_PART_ENTRY_NAME\0"
 276                 "DM_NAME\0"
 277                 "ID_MODEL_FROM_DATABASE\0"
 278                 "ID_MODEL\0";
 279
 280         _cleanup_(sd_device_unrefp) sd_device *device = NULL;
 281         const char *i, *name;
 282         struct stat st;
 283
 284         assert(path);
 285
 286         if (stat(path, &st) < 0)
 287                 return NULL;
 288
 289         if (!S_ISBLK(st.st_mode))
 290                 return NULL;
 291
 292         if (sd_device_new_from_devnum(&device, 'b', st.st_rdev) < 0)
 293                 return NULL;
 294
 295         NULSTR_FOREACH(i, name_fields)
 296                 if (sd_device_get_property_value(device, i, &name) >= 0 &&
 297                     !isempty(name))
 298                         return strdup(name);
 299
 300         return NULL;
 301 }
 302
 303 static char *disk_mount_point(const char *label) {
 304         _cleanup_free_ char *device = NULL;
 305         _cleanup_endmntent_ FILE *f = NULL;
 306         struct mntent *m;
 307
 308         /* Yeah, we don't support native systemd unit files here for now */
 309
 310         if (asprintf(&device, "/dev/mapper/%s", label) < 0)
 311                 return NULL;
 312
 313         f = setmntent("/etc/fstab", "re");
 314         if (!f)
 315                 return NULL;
 316
 317         while ((m = getmntent(f)))
 318                 if (path_equal(m->mnt_fsname, device))
 319                         return strdup(m->mnt_dir);
 320
 321         return NULL;
 322 }
 323
 324 static int get_password(const char *vol, const char *src, usec_t until, bool accept_cached, char ***ret) {
 325         _cleanup_free_ char *description = NULL, *name_buffer = NULL, *mount_point = NULL, *text = NULL, *disk_path = NULL;
 326         _cleanup_strv_free_erase_ char **passwords = NULL;
 327         const char *name = NULL;
 328         char **p, *id;
 329         int r = 0;
 330
 331         assert(vol);
 332         assert(src);
 333         assert(ret);
 334
 335         description = disk_description(src);
 336         mount_point = disk_mount_point(vol);
 337
 338         disk_path = cescape(src);
 339         if (!disk_path)
 340                 return log_oom();
 341
 342         if (description && streq(vol, description))
 343                 /* If the description string is simply the
 344                  * volume name, then let's not show this
 345                  * twice */
 346                 description = mfree(description);
 347
 348         if (mount_point && description)
 349                 r = asprintf(&name_buffer, "%s (%s) on %s", description, vol, mount_point);
 350         else if (mount_point)
 351                 r = asprintf(&name_buffer, "%s on %s", vol, mount_point);
 352         else if (description)
 353                 r = asprintf(&name_buffer, "%s (%s)", description, vol);
 354
 355         if (r < 0)
 356                 return log_oom();
 357
 358         name = name_buffer ? name_buffer : vol;
 359
 360         if (asprintf(&text, "Please enter passphrase for disk %s:", name) < 0)
 361                 return log_oom();
 362
 363         id = strjoina("cryptsetup:", disk_path);
 364
 365         r = ask_password_auto(text, "drive-harddisk", id, "cryptsetup", until,
 366                               ASK_PASSWORD_PUSH_CACHE | (accept_cached*ASK_PASSWORD_ACCEPT_CACHED),
 367                               &passwords);
 368         if (r < 0)
 369                 return log_error_errno(r, "Failed to query password: %m");
 370
 371         if (arg_verify) {
 372                 _cleanup_strv_free_erase_ char **passwords2 = NULL;
 373
 374                 assert(strv_length(passwords) == 1);
 375
 376                 if (asprintf(&text, "Please enter passphrase for disk %s (verification):", name) < 0)
 377                         return log_oom();
 378
 379                 id = strjoina("cryptsetup-verification:", disk_path);
 380
 381                 r = ask_password_auto(text, "drive-harddisk", id, "cryptsetup", until, ASK_PASSWORD_PUSH_CACHE, &passwords2);
 382                 if (r < 0)
 383                         return log_error_errno(r, "Failed to query verification password: %m");
 384
 385                 assert(strv_length(passwords2) == 1);
 386
 387                 if (!streq(passwords[0], passwords2[0])) {
 388                         log_warning("Passwords did not match, retrying.");
 389                         return -EAGAIN;
 390                 }
 391         }
 392
 393         strv_uniq(passwords);
 394
 395         STRV_FOREACH(p, passwords) {
 396                 char *c;
 397
 398                 if (strlen(*p)+1 >= arg_key_size)
 399                         continue;
 400
 401                 /* Pad password if necessary */
 402                 c = new(char, arg_key_size);
 403                 if (!c)
 404                         return log_oom();
 405
 406                 strncpy(c, *p, arg_key_size);
 407                 free(*p);
 408                 *p = c;
 409         }
 410
 411         *ret = TAKE_PTR(passwords);
 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 #ifdef CRYPT_TCRYPT_VERA_MODES
 442         if (arg_tcrypt_veracrypt)
 443                 params.flags |= CRYPT_TCRYPT_VERA_MODES;
 444 #endif
 445
 446         if (key_file) {
 447                 r = read_one_line_file(key_file, &passphrase);
 448                 if (r < 0) {
 449                         log_error_errno(r, "Failed to read password file '%s': %m", key_file);
 450                         return -EAGAIN;
 451                 }
 452
 453                 params.passphrase = passphrase;
 454         } else
 455                 params.passphrase = passwords[0];
 456         params.passphrase_size = strlen(params.passphrase);
 457
 458         r = crypt_load(cd, CRYPT_TCRYPT, &params);
 459         if (r < 0) {
 460                 if (key_file && r == -EPERM) {
 461                         log_error("Failed to activate using password file '%s'.", key_file);
 462                         return -EAGAIN;
 463                 }
 464                 return r;
 465         }
 466
 467         return crypt_activate_by_volume_key(cd, name, NULL, 0, flags);
 468 }
 469
 470 static int attach_luks_or_plain(struct crypt_device *cd,
 471                                 const char *name,
 472                                 const char *key_file,
 473                                 const char *data_device,
 474                                 char **passwords,
 475                                 uint32_t flags) {
 476         int r = 0;
 477         bool pass_volume_key = false;
 478
 479         assert(cd);
 480         assert(name);
 481         assert(key_file || passwords);
 482
 483         if (!arg_type || STR_IN_SET(arg_type, ANY_LUKS, CRYPT_LUKS1)) {
 484                 r = crypt_load(cd, CRYPT_LUKS, NULL);
 485                 if (r < 0) {
 486                         log_error("crypt_load() failed on device %s.\n", crypt_get_device_name(cd));
 487                         return r;
 488                 }
 489
 490                 if (data_device)
 491                         r = crypt_set_data_device(cd, data_device);
 492         }
 493
 494         if ((!arg_type && r < 0) || streq_ptr(arg_type, CRYPT_PLAIN)) {
 495                 struct crypt_params_plain params = {
 496                         .offset = arg_offset,
 497                         .skip = arg_skip,
 498 #if HAVE_LIBCRYPTSETUP_SECTOR_SIZE
 499                         .sector_size = arg_sector_size,
 500 #endif
 501                 };
 502                 const char *cipher, *cipher_mode;
 503                 _cleanup_free_ char *truncated_cipher = NULL;
 504
 505                 if (arg_hash) {
 506                         /* plain isn't a real hash type. it just means "use no hash" */
 507                         if (!streq(arg_hash, "plain"))
 508                                 params.hash = arg_hash;
 509                 } else if (!key_file)
 510                         /* for CRYPT_PLAIN, the behaviour of cryptsetup
 511                          * package is to not hash when a key file is provided */
 512                         params.hash = "ripemd160";
 513
 514                 if (arg_cipher) {
 515                         size_t l;
 516
 517                         l = strcspn(arg_cipher, "-");
 518                         truncated_cipher = strndup(arg_cipher, l);
 519                         if (!truncated_cipher)
 520                                 return log_oom();
 521
 522                         cipher = truncated_cipher;
 523                         cipher_mode = arg_cipher[l] ? arg_cipher+l+1 : "plain";
 524                 } else {
 525                         cipher = "aes";
 526                         cipher_mode = "cbc-essiv:sha256";
 527                 }
 528
 529                 /* for CRYPT_PLAIN limit reads
 530                  * from keyfile to key length, and
 531                  * ignore keyfile-size */
 532                 arg_keyfile_size = arg_key_size;
 533
 534                 /* In contrast to what the name
 535                  * crypt_setup() might suggest this
 536                  * doesn't actually format anything,
 537                  * it just configures encryption
 538                  * parameters when used for plain
 539                  * mode. */
 540                 r = crypt_format(cd, CRYPT_PLAIN, cipher, cipher_mode, NULL, NULL, arg_keyfile_size, &params);
 541
 542                 /* hash == NULL implies the user passed "plain" */
 543                 pass_volume_key = (params.hash == NULL);
 544         }
 545
 546         if (r < 0)
 547                 return log_error_errno(r, "Loading of cryptographic parameters failed: %m");
 548
 549         log_info("Set cipher %s, mode %s, key size %i bits for device %s.",
 550                  crypt_get_cipher(cd),
 551                  crypt_get_cipher_mode(cd),
 552                  crypt_get_volume_key_size(cd)*8,
 553                  crypt_get_device_name(cd));
 554
 555         if (key_file) {
 556                 r = crypt_activate_by_keyfile_offset(cd, name, arg_key_slot, key_file, arg_keyfile_size, arg_keyfile_offset, flags);
 557                 if (r < 0) {
 558                         log_error_errno(r, "Failed to activate with key file '%s': %m", key_file);
 559                         return -EAGAIN;
 560                 }
 561         } else {
 562                 char **p;
 563
 564                 STRV_FOREACH(p, passwords) {
 565                         if (pass_volume_key)
 566                                 r = crypt_activate_by_volume_key(cd, name, *p, arg_key_size, flags);
 567                         else
 568                                 r = crypt_activate_by_passphrase(cd, name, arg_key_slot, *p, strlen(*p), flags);
 569
 570                         if (r >= 0)
 571                                 break;
 572                 }
 573         }
 574
 575         return r;
 576 }
 577
 578 static int help(void) {
 579         _cleanup_free_ char *link = NULL;
 580         int r;
 581
 582         r = terminal_urlify_man("systemd-cryptsetup@.service", "8", &link);
 583         if (r < 0)
 584                 return log_oom();
 585
 586         printf("%s attach VOLUME SOURCEDEVICE [PASSWORD] [OPTIONS]\n"
 587                "%s detach VOLUME\n\n"
 588                "Attaches or detaches an encrypted block device.\n"
 589                "\nSee the %s for details.\n"
 590                , program_invocation_short_name
 591                , program_invocation_short_name
 592                , link
 593         );
 594
 595         return 0;
 596 }
 597
 598 int main(int argc, char *argv[]) {
 599         _cleanup_(crypt_freep) struct crypt_device *cd = NULL;
 600         int r = -EINVAL;
 601
 602         if (argc <= 1) {
 603                 r = help();
 604                 goto finish;
 605         }
 606
 607         if (argc < 3) {
 608                 log_error("This program requires at least two arguments.");
 609                 goto finish;
 610         }
 611
 612         log_setup_service();
 613
 614         umask(0022);
 615
 616         if (streq(argv[1], "attach")) {
 617                 uint32_t flags = 0;
 618                 unsigned tries;
 619                 usec_t until;
 620                 crypt_status_info status;
 621                 const char *key_file = NULL;
 622
 623                 /* Arguments: systemd-cryptsetup attach VOLUME SOURCE-DEVICE [PASSWORD] [OPTIONS] */
 624
 625                 if (argc < 4) {
 626                         log_error("attach requires at least two arguments.");
 627                         goto finish;
 628                 }
 629
 630                 if (argc >= 5 &&
 631                     argv[4][0] &&
 632                     !streq(argv[4], "-") &&
 633                     !streq(argv[4], "none")) {
 634
 635                         if (!path_is_absolute(argv[4]))
 636                                 log_error("Password file path '%s' is not absolute. Ignoring.", argv[4]);
 637                         else
 638                                 key_file = argv[4];
 639                 }
 640
 641                 if (argc >= 6 && argv[5][0] && !streq(argv[5], "-")) {
 642                         if (parse_options(argv[5]) < 0)
 643                                 goto finish;
 644                 }
 645
 646                 /* A delicious drop of snake oil */
 647                 mlockall(MCL_FUTURE);
 648
 649                 if (arg_header) {
 650                         log_debug("LUKS header: %s", arg_header);
 651                         r = crypt_init(&cd, arg_header);
 652                 } else
 653                         r = crypt_init(&cd, argv[3]);
 654                 if (r < 0) {
 655                         log_error_errno(r, "crypt_init() failed: %m");
 656                         goto finish;
 657                 }
 658
 659                 crypt_set_log_callback(cd, cryptsetup_log_glue, NULL);
 660
 661                 status = crypt_status(cd, argv[2]);
 662                 if (IN_SET(status, CRYPT_ACTIVE, CRYPT_BUSY)) {
 663                         log_info("Volume %s already active.", argv[2]);
 664                         r = 0;
 665                         goto finish;
 666                 }
 667
 668                 if (arg_readonly)
 669                         flags |= CRYPT_ACTIVATE_READONLY;
 670
 671                 if (arg_discards)
 672                         flags |= CRYPT_ACTIVATE_ALLOW_DISCARDS;
 673
 674                 if (arg_timeout == USEC_INFINITY)
 675                         until = 0;
 676                 else
 677                         until = now(CLOCK_MONOTONIC) + arg_timeout;
 678
 679                 arg_key_size = (arg_key_size > 0 ? arg_key_size : (256 / 8));
 680
 681                 if (key_file) {
 682                         struct stat st;
 683
 684                         /* Ideally we'd do this on the open fd, but since this is just a
 685                          * warning it's OK to do this in two steps. */
 686                         if (stat(key_file, &st) >= 0 && S_ISREG(st.st_mode) && (st.st_mode & 0005))
 687                                 log_warning("Key file %s is world-readable. This is not a good idea!", key_file);
 688                 }
 689
 690                 for (tries = 0; arg_tries == 0 || tries < arg_tries; tries++) {
 691                         _cleanup_strv_free_erase_ char **passwords = NULL;
 692
 693                         if (!key_file) {
 694                                 r = get_password(argv[2], argv[3], until, tries == 0 && !arg_verify, &passwords);
 695                                 if (r == -EAGAIN)
 696                                         continue;
 697                                 if (r < 0)
 698                                         goto finish;
 699                         }
 700
 701                         if (streq_ptr(arg_type, CRYPT_TCRYPT))
 702                                 r = attach_tcrypt(cd, argv[2], key_file, passwords, flags);
 703                         else
 704                                 r = attach_luks_or_plain(cd,
 705                                                          argv[2],
 706                                                          key_file,
 707                                                          arg_header ? argv[3] : NULL,
 708                                                          passwords,
 709                                                          flags);
 710                         if (r >= 0)
 711                                 break;
 712                         if (r == -EAGAIN) {
 713                                 key_file = NULL;
 714                                 continue;
 715                         }
 716                         if (r != -EPERM) {
 717                                 log_error_errno(r, "Failed to activate: %m");
 718                                 goto finish;
 719                         }
 720
 721                         log_warning("Invalid passphrase.");
 722                 }
 723
 724                 if (arg_tries != 0 && tries >= arg_tries) {
 725                         log_error("Too many attempts; giving up.");
 726                         r = -EPERM;
 727                         goto finish;
 728                 }
 729
 730         } else if (streq(argv[1], "detach")) {
 731
 732                 r = crypt_init_by_name(&cd, argv[2]);
 733                 if (r == -ENODEV) {
 734                         log_info("Volume %s already inactive.", argv[2]);
 735                         r = 0;
 736                         goto finish;
 737                 }
 738                 if (r < 0) {
 739                         log_error_errno(r, "crypt_init_by_name() failed: %m");
 740                         goto finish;
 741                 }
 742
 743                 crypt_set_log_callback(cd, cryptsetup_log_glue, NULL);
 744
 745                 r = crypt_deactivate(cd, argv[2]);
 746                 if (r < 0) {
 747                         log_error_errno(r, "Failed to deactivate: %m");
 748                         goto finish;
 749                 }
 750
 751         } else {
 752                 log_error("Unknown verb %s.", argv[1]);
 753                 goto finish;
 754         }
 755
 756         r = 0;
 757
 758 finish:
 759         free(arg_cipher);
 760         free(arg_hash);
 761         free(arg_header);
 762         strv_free(arg_tcrypt_keyfiles);
 763
 764         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 765 }