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 "main-func.h"
  18 #include "mount-util.h"
  19 #include "parse-util.h"
  20 #include "path-util.h"
  21 #include "string-util.h"
  22 #include "strv.h"
  23 #include "pretty-print.h"
  24 #include "util.h"
  25
  26 /* internal helper */
  27 #define ANY_LUKS "LUKS"
  28 /* as in src/cryptsetup.h */
  29 #define CRYPT_SECTOR_SIZE 512
  30 #define CRYPT_MAX_SECTOR_SIZE 4096
  31
  32 static const char *arg_type = NULL; /* ANY_LUKS, CRYPT_LUKS1, CRYPT_LUKS2, CRYPT_TCRYPT or CRYPT_PLAIN */
  33 static char *arg_cipher = NULL;
  34 static unsigned arg_key_size = 0;
  35 #if HAVE_LIBCRYPTSETUP_SECTOR_SIZE
  36 static unsigned arg_sector_size = CRYPT_SECTOR_SIZE;
  37 #endif
  38 static int arg_key_slot = CRYPT_ANY_SLOT;
  39 static unsigned arg_keyfile_size = 0;
  40 static uint64_t arg_keyfile_offset = 0;
  41 static char *arg_hash = NULL;
  42 static char *arg_header = NULL;
  43 static unsigned arg_tries = 3;
  44 static bool arg_readonly = false;
  45 static bool arg_verify = false;
  46 static bool arg_discards = false;
  47 static bool arg_tcrypt_hidden = false;
  48 static bool arg_tcrypt_system = false;
  49 #ifdef CRYPT_TCRYPT_VERA_MODES
  50 static bool arg_tcrypt_veracrypt = false;
  51 #endif
  52 static char **arg_tcrypt_keyfiles = NULL;
  53 static uint64_t arg_offset = 0;
  54 static uint64_t arg_skip = 0;
  55 static usec_t arg_timeout = USEC_INFINITY;
  56
  57 STATIC_DESTRUCTOR_REGISTER(arg_cipher, freep);
  58 STATIC_DESTRUCTOR_REGISTER(arg_hash, freep);
  59 STATIC_DESTRUCTOR_REGISTER(arg_header, freep);
  60 STATIC_DESTRUCTOR_REGISTER(arg_tcrypt_keyfiles, strv_freep);
  61
  62 /* Options Debian's crypttab knows we don't:
  63
  64     precheck=
  65     check=
  66     checkargs=
  67     noearly=
  68     loud=
  69     keyscript=
  70 */
  71
  72 static int parse_one_option(const char *option) {
  73         const char *val;
  74         int r;
  75
  76         assert(option);
  77
  78         /* Handled outside of this tool */
  79         if (STR_IN_SET(option, "noauto", "auto", "nofail", "fail", "_netdev"))
  80                 return 0;
  81
  82         if ((val = startswith(option, "cipher="))) {
  83                 r = free_and_strdup(&arg_cipher, val);
  84                 if (r < 0)
  85                         return log_oom();
  86
  87         } else if ((val = startswith(option, "size="))) {
  88
  89                 r = safe_atou(val, &arg_key_size);
  90                 if (r < 0) {
  91                         log_error_errno(r, "Failed to parse %s, ignoring: %m", option);
  92                         return 0;
  93                 }
  94
  95                 if (arg_key_size % 8) {
  96                         log_error("size= not a multiple of 8, ignoring.");
  97                         return 0;
  98                 }
  99
 100                 arg_key_size /= 8;
 101
 102         } else if ((val = startswith(option, "sector-size="))) {
 103
 104 #if HAVE_LIBCRYPTSETUP_SECTOR_SIZE
 105                 r = safe_atou(val, &arg_sector_size);
 106                 if (r < 0) {
 107                         log_error_errno(r, "Failed to parse %s, ignoring: %m", option);
 108                         return 0;
 109                 }
 110
 111                 if (arg_sector_size % 2) {
 112                         log_error("sector-size= not a multiple of 2, ignoring.");
 113                         return 0;
 114                 }
 115
 116                 if (arg_sector_size < CRYPT_SECTOR_SIZE || arg_sector_size > CRYPT_MAX_SECTOR_SIZE) {
 117                         log_error("sector-size= is outside of %u and %u, ignoring.", CRYPT_SECTOR_SIZE, CRYPT_MAX_SECTOR_SIZE);
 118                         return 0;
 119                 }
 120 #else
 121                 log_error("sector-size= is not supported, compiled with old libcryptsetup.");
 122                 return 0;
 123 #endif
 124
 125         } else if ((val = startswith(option, "key-slot="))) {
 126
 127                 arg_type = ANY_LUKS;
 128                 r = safe_atoi(val, &arg_key_slot);
 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, "tcrypt-keyfile="))) {
 135
 136                 arg_type = CRYPT_TCRYPT;
 137                 if (path_is_absolute(val)) {
 138                         if (strv_extend(&arg_tcrypt_keyfiles, val) < 0)
 139                                 return log_oom();
 140                 } else
 141                         log_error("Key file path \"%s\" is not absolute. Ignoring.", val);
 142
 143         } else if ((val = startswith(option, "keyfile-size="))) {
 144
 145                 r = safe_atou(val, &arg_keyfile_size);
 146                 if (r < 0) {
 147                         log_error_errno(r, "Failed to parse %s, ignoring: %m", option);
 148                         return 0;
 149                 }
 150
 151         } else if ((val = startswith(option, "keyfile-offset="))) {
 152                 uint64_t off;
 153
 154                 r = safe_atou64(val, &off);
 155                 if (r < 0) {
 156                         log_error_errno(r, "Failed to parse %s, ignoring: %m", option);
 157                         return 0;
 158                 }
 159
 160                 if ((size_t) off != off) {
 161                         /* https://gitlab.com/cryptsetup/cryptsetup/issues/359 */
 162                         log_error("keyfile-offset= value would truncated to %zu, ignoring.", (size_t) off);
 163                         return 0;
 164                 }
 165
 166                 arg_keyfile_offset = off;
 167
 168         } else if ((val = startswith(option, "hash="))) {
 169                 r = free_and_strdup(&arg_hash, val);
 170                 if (r < 0)
 171                         return log_oom();
 172
 173         } else if ((val = startswith(option, "header="))) {
 174                 arg_type = ANY_LUKS;
 175
 176                 if (!path_is_absolute(val)) {
 177                         log_error("Header path \"%s\" is not absolute, refusing.", val);
 178                         return -EINVAL;
 179                 }
 180
 181                 if (arg_header) {
 182                         log_error("Duplicate header= option, refusing.");
 183                         return -EINVAL;
 184                 }
 185
 186                 arg_header = strdup(val);
 187                 if (!arg_header)
 188                         return log_oom();
 189
 190         } else if ((val = startswith(option, "tries="))) {
 191
 192                 r = safe_atou(val, &arg_tries);
 193                 if (r < 0) {
 194                         log_error_errno(r, "Failed to parse %s, ignoring: %m", option);
 195                         return 0;
 196                 }
 197
 198         } else if (STR_IN_SET(option, "readonly", "read-only"))
 199                 arg_readonly = true;
 200         else if (streq(option, "verify"))
 201                 arg_verify = true;
 202         else if (STR_IN_SET(option, "allow-discards", "discard"))
 203                 arg_discards = true;
 204         else if (streq(option, "luks"))
 205                 arg_type = ANY_LUKS;
 206         else if (streq(option, "tcrypt"))
 207                 arg_type = CRYPT_TCRYPT;
 208         else if (streq(option, "tcrypt-hidden")) {
 209                 arg_type = CRYPT_TCRYPT;
 210                 arg_tcrypt_hidden = true;
 211         } else if (streq(option, "tcrypt-system")) {
 212                 arg_type = CRYPT_TCRYPT;
 213                 arg_tcrypt_system = true;
 214         } else if (streq(option, "tcrypt-veracrypt")) {
 215 #ifdef CRYPT_TCRYPT_VERA_MODES
 216                 arg_type = CRYPT_TCRYPT;
 217                 arg_tcrypt_veracrypt = true;
 218 #else
 219                 log_error("This version of cryptsetup does not support tcrypt-veracrypt; refusing.");
 220                 return -EINVAL;
 221 #endif
 222         } else if (STR_IN_SET(option, "plain", "swap", "tmp"))
 223                 arg_type = CRYPT_PLAIN;
 224         else if ((val = startswith(option, "timeout="))) {
 225
 226                 r = parse_sec_fix_0(val, &arg_timeout);
 227                 if (r < 0) {
 228                         log_error_errno(r, "Failed to parse %s, ignoring: %m", option);
 229                         return 0;
 230                 }
 231
 232         } else if ((val = startswith(option, "offset="))) {
 233
 234                 r = safe_atou64(val, &arg_offset);
 235                 if (r < 0)
 236                         return log_error_errno(r, "Failed to parse %s: %m", option);
 237
 238         } else if ((val = startswith(option, "skip="))) {
 239
 240                 r = safe_atou64(val, &arg_skip);
 241                 if (r < 0)
 242                         return log_error_errno(r, "Failed to parse %s: %m", option);
 243
 244         } else if (!streq(option, "none"))
 245                 log_warning("Encountered unknown /etc/crypttab option '%s', ignoring.", option);
 246
 247         return 0;
 248 }
 249
 250 static int parse_options(const char *options) {
 251         const char *word, *state;
 252         size_t l;
 253         int r;
 254
 255         assert(options);
 256
 257         FOREACH_WORD_SEPARATOR(word, l, options, ",", state) {
 258                 _cleanup_free_ char *o;
 259
 260                 o = strndup(word, l);
 261                 if (!o)
 262                         return -ENOMEM;
 263                 r = parse_one_option(o);
 264                 if (r < 0)
 265                         return r;
 266         }
 267
 268         /* sanity-check options */
 269         if (arg_type != NULL && !streq(arg_type, CRYPT_PLAIN)) {
 270                 if (arg_offset)
 271                       log_warning("offset= ignored with type %s", arg_type);
 272                 if (arg_skip)
 273                       log_warning("skip= ignored with type %s", arg_type);
 274         }
 275
 276         return 0;
 277 }
 278
 279 static char* disk_description(const char *path) {
 280         static const char name_fields[] =
 281                 "ID_PART_ENTRY_NAME\0"
 282                 "DM_NAME\0"
 283                 "ID_MODEL_FROM_DATABASE\0"
 284                 "ID_MODEL\0";
 285
 286         _cleanup_(sd_device_unrefp) sd_device *device = NULL;
 287         const char *i, *name;
 288         struct stat st;
 289
 290         assert(path);
 291
 292         if (stat(path, &st) < 0)
 293                 return NULL;
 294
 295         if (!S_ISBLK(st.st_mode))
 296                 return NULL;
 297
 298         if (sd_device_new_from_devnum(&device, 'b', st.st_rdev) < 0)
 299                 return NULL;
 300
 301         NULSTR_FOREACH(i, name_fields)
 302                 if (sd_device_get_property_value(device, i, &name) >= 0 &&
 303                     !isempty(name))
 304                         return strdup(name);
 305
 306         return NULL;
 307 }
 308
 309 static char *disk_mount_point(const char *label) {
 310         _cleanup_free_ char *device = NULL;
 311         _cleanup_endmntent_ FILE *f = NULL;
 312         struct mntent *m;
 313
 314         /* Yeah, we don't support native systemd unit files here for now */
 315
 316         if (asprintf(&device, "/dev/mapper/%s", label) < 0)
 317                 return NULL;
 318
 319         f = setmntent("/etc/fstab", "re");
 320         if (!f)
 321                 return NULL;
 322
 323         while ((m = getmntent(f)))
 324                 if (path_equal(m->mnt_fsname, device))
 325                         return strdup(m->mnt_dir);
 326
 327         return NULL;
 328 }
 329
 330 static int get_password(const char *vol, const char *src, usec_t until, bool accept_cached, char ***ret) {
 331         _cleanup_free_ char *description = NULL, *name_buffer = NULL, *mount_point = NULL, *text = NULL, *disk_path = NULL;
 332         _cleanup_strv_free_erase_ char **passwords = NULL;
 333         const char *name = NULL;
 334         char **p, *id;
 335         int r = 0;
 336
 337         assert(vol);
 338         assert(src);
 339         assert(ret);
 340
 341         description = disk_description(src);
 342         mount_point = disk_mount_point(vol);
 343
 344         disk_path = cescape(src);
 345         if (!disk_path)
 346                 return log_oom();
 347
 348         if (description && streq(vol, description))
 349                 /* If the description string is simply the
 350                  * volume name, then let's not show this
 351                  * twice */
 352                 description = mfree(description);
 353
 354         if (mount_point && description)
 355                 r = asprintf(&name_buffer, "%s (%s) on %s", description, vol, mount_point);
 356         else if (mount_point)
 357                 r = asprintf(&name_buffer, "%s on %s", vol, mount_point);
 358         else if (description)
 359                 r = asprintf(&name_buffer, "%s (%s)", description, vol);
 360
 361         if (r < 0)
 362                 return log_oom();
 363
 364         name = name_buffer ? name_buffer : vol;
 365
 366         if (asprintf(&text, "Please enter passphrase for disk %s:", name) < 0)
 367                 return log_oom();
 368
 369         id = strjoina("cryptsetup:", disk_path);
 370
 371         r = ask_password_auto(text, "drive-harddisk", id, "cryptsetup", until,
 372                               ASK_PASSWORD_PUSH_CACHE | (accept_cached*ASK_PASSWORD_ACCEPT_CACHED),
 373                               &passwords);
 374         if (r < 0)
 375                 return log_error_errno(r, "Failed to query password: %m");
 376
 377         if (arg_verify) {
 378                 _cleanup_strv_free_erase_ char **passwords2 = NULL;
 379
 380                 assert(strv_length(passwords) == 1);
 381
 382                 if (asprintf(&text, "Please enter passphrase for disk %s (verification):", name) < 0)
 383                         return log_oom();
 384
 385                 id = strjoina("cryptsetup-verification:", disk_path);
 386
 387                 r = ask_password_auto(text, "drive-harddisk", id, "cryptsetup", until, ASK_PASSWORD_PUSH_CACHE, &passwords2);
 388                 if (r < 0)
 389                         return log_error_errno(r, "Failed to query verification password: %m");
 390
 391                 assert(strv_length(passwords2) == 1);
 392
 393                 if (!streq(passwords[0], passwords2[0])) {
 394                         log_warning("Passwords did not match, retrying.");
 395                         return -EAGAIN;
 396                 }
 397         }
 398
 399         strv_uniq(passwords);
 400
 401         STRV_FOREACH(p, passwords) {
 402                 char *c;
 403
 404                 if (strlen(*p)+1 >= arg_key_size)
 405                         continue;
 406
 407                 /* Pad password if necessary */
 408                 c = new(char, arg_key_size);
 409                 if (!c)
 410                         return log_oom();
 411
 412                 strncpy(c, *p, arg_key_size);
 413                 free(*p);
 414                 *p = c;
 415         }
 416
 417         *ret = TAKE_PTR(passwords);
 418
 419         return 0;
 420 }
 421
 422 static int attach_tcrypt(
 423                 struct crypt_device *cd,
 424                 const char *name,
 425                 const char *key_file,
 426                 char **passwords,
 427                 uint32_t flags) {
 428
 429         int r = 0;
 430         _cleanup_free_ char *passphrase = NULL;
 431         struct crypt_params_tcrypt params = {
 432                 .flags = CRYPT_TCRYPT_LEGACY_MODES,
 433                 .keyfiles = (const char **)arg_tcrypt_keyfiles,
 434                 .keyfiles_count = strv_length(arg_tcrypt_keyfiles)
 435         };
 436
 437         assert(cd);
 438         assert(name);
 439         assert(key_file || (passwords && passwords[0]));
 440
 441         if (arg_tcrypt_hidden)
 442                 params.flags |= CRYPT_TCRYPT_HIDDEN_HEADER;
 443
 444         if (arg_tcrypt_system)
 445                 params.flags |= CRYPT_TCRYPT_SYSTEM_HEADER;
 446
 447 #ifdef CRYPT_TCRYPT_VERA_MODES
 448         if (arg_tcrypt_veracrypt)
 449                 params.flags |= CRYPT_TCRYPT_VERA_MODES;
 450 #endif
 451
 452         if (key_file) {
 453                 r = read_one_line_file(key_file, &passphrase);
 454                 if (r < 0) {
 455                         log_error_errno(r, "Failed to read password file '%s': %m", key_file);
 456                         return -EAGAIN;
 457                 }
 458
 459                 params.passphrase = passphrase;
 460         } else
 461                 params.passphrase = passwords[0];
 462         params.passphrase_size = strlen(params.passphrase);
 463
 464         r = crypt_load(cd, CRYPT_TCRYPT, &params);
 465         if (r < 0) {
 466                 if (key_file && r == -EPERM) {
 467                         log_error("Failed to activate using password file '%s'.", key_file);
 468                         return -EAGAIN;
 469                 }
 470                 return r;
 471         }
 472
 473         return crypt_activate_by_volume_key(cd, name, NULL, 0, flags);
 474 }
 475
 476 static int attach_luks_or_plain(struct crypt_device *cd,
 477                                 const char *name,
 478                                 const char *key_file,
 479                                 const char *data_device,
 480                                 char **passwords,
 481                                 uint32_t flags) {
 482         int r = 0;
 483         bool pass_volume_key = false;
 484
 485         assert(cd);
 486         assert(name);
 487         assert(key_file || passwords);
 488
 489         if (!arg_type || STR_IN_SET(arg_type, ANY_LUKS, CRYPT_LUKS1)) {
 490                 r = crypt_load(cd, CRYPT_LUKS, NULL);
 491                 if (r < 0) {
 492                         log_error("crypt_load() failed on device %s.\n", crypt_get_device_name(cd));
 493                         return r;
 494                 }
 495
 496                 if (data_device)
 497                         r = crypt_set_data_device(cd, data_device);
 498         }
 499
 500         if ((!arg_type && r < 0) || streq_ptr(arg_type, CRYPT_PLAIN)) {
 501                 struct crypt_params_plain params = {
 502                         .offset = arg_offset,
 503                         .skip = arg_skip,
 504 #if HAVE_LIBCRYPTSETUP_SECTOR_SIZE
 505                         .sector_size = arg_sector_size,
 506 #endif
 507                 };
 508                 const char *cipher, *cipher_mode;
 509                 _cleanup_free_ char *truncated_cipher = NULL;
 510
 511                 if (arg_hash) {
 512                         /* plain isn't a real hash type. it just means "use no hash" */
 513                         if (!streq(arg_hash, "plain"))
 514                                 params.hash = arg_hash;
 515                 } else if (!key_file)
 516                         /* for CRYPT_PLAIN, the behaviour of cryptsetup
 517                          * package is to not hash when a key file is provided */
 518                         params.hash = "ripemd160";
 519
 520                 if (arg_cipher) {
 521                         size_t l;
 522
 523                         l = strcspn(arg_cipher, "-");
 524                         truncated_cipher = strndup(arg_cipher, l);
 525                         if (!truncated_cipher)
 526                                 return log_oom();
 527
 528                         cipher = truncated_cipher;
 529                         cipher_mode = arg_cipher[l] ? arg_cipher+l+1 : "plain";
 530                 } else {
 531                         cipher = "aes";
 532                         cipher_mode = "cbc-essiv:sha256";
 533                 }
 534
 535                 /* for CRYPT_PLAIN limit reads
 536                  * from keyfile to key length, and
 537                  * ignore keyfile-size */
 538                 arg_keyfile_size = arg_key_size;
 539
 540                 /* In contrast to what the name
 541                  * crypt_setup() might suggest this
 542                  * doesn't actually format anything,
 543                  * it just configures encryption
 544                  * parameters when used for plain
 545                  * mode. */
 546                 r = crypt_format(cd, CRYPT_PLAIN, cipher, cipher_mode, NULL, NULL, arg_keyfile_size, &params);
 547
 548                 /* hash == NULL implies the user passed "plain" */
 549                 pass_volume_key = (params.hash == NULL);
 550         }
 551
 552         if (r < 0)
 553                 return log_error_errno(r, "Loading of cryptographic parameters failed: %m");
 554
 555         log_info("Set cipher %s, mode %s, key size %i bits for device %s.",
 556                  crypt_get_cipher(cd),
 557                  crypt_get_cipher_mode(cd),
 558                  crypt_get_volume_key_size(cd)*8,
 559                  crypt_get_device_name(cd));
 560
 561         if (key_file) {
 562                 r = crypt_activate_by_keyfile_offset(cd, name, arg_key_slot, key_file, arg_keyfile_size, arg_keyfile_offset, flags);
 563                 if (r < 0) {
 564                         log_error_errno(r, "Failed to activate with key file '%s': %m", key_file);
 565                         return -EAGAIN;
 566                 }
 567         } else {
 568                 char **p;
 569
 570                 STRV_FOREACH(p, passwords) {
 571                         if (pass_volume_key)
 572                                 r = crypt_activate_by_volume_key(cd, name, *p, arg_key_size, flags);
 573                         else
 574                                 r = crypt_activate_by_passphrase(cd, name, arg_key_slot, *p, strlen(*p), flags);
 575
 576                         if (r >= 0)
 577                                 break;
 578                 }
 579         }
 580
 581         return r;
 582 }
 583
 584 static int help(void) {
 585         _cleanup_free_ char *link = NULL;
 586         int r;
 587
 588         r = terminal_urlify_man("systemd-cryptsetup@.service", "8", &link);
 589         if (r < 0)
 590                 return log_oom();
 591
 592         printf("%s attach VOLUME SOURCEDEVICE [PASSWORD] [OPTIONS]\n"
 593                "%s detach VOLUME\n\n"
 594                "Attaches or detaches an encrypted block device.\n"
 595                "\nSee the %s for details.\n"
 596                , program_invocation_short_name
 597                , program_invocation_short_name
 598                , link
 599         );
 600
 601         return 0;
 602 }
 603
 604 static int run(int argc, char *argv[]) {
 605         _cleanup_(crypt_freep) struct crypt_device *cd = NULL;
 606         int r;
 607
 608         if (argc <= 1)
 609                 return help();
 610
 611         if (argc < 3) {
 612                 log_error("This program requires at least two arguments.");
 613                 return -EINVAL;
 614         }
 615
 616         log_setup_service();
 617
 618         umask(0022);
 619
 620         if (streq(argv[1], "attach")) {
 621                 uint32_t flags = 0;
 622                 unsigned tries;
 623                 usec_t until;
 624                 crypt_status_info status;
 625                 const char *key_file = NULL;
 626
 627                 /* Arguments: systemd-cryptsetup attach VOLUME SOURCE-DEVICE [PASSWORD] [OPTIONS] */
 628
 629                 if (argc < 4) {
 630                         log_error("attach requires at least two arguments.");
 631                         return -EINVAL;
 632                 }
 633
 634                 if (argc >= 5 &&
 635                     argv[4][0] &&
 636                     !streq(argv[4], "-") &&
 637                     !streq(argv[4], "none")) {
 638
 639                         if (!path_is_absolute(argv[4]))
 640                                 log_error("Password file path '%s' is not absolute. Ignoring.", argv[4]);
 641                         else
 642                                 key_file = argv[4];
 643                 }
 644
 645                 if (argc >= 6 && argv[5][0] && !streq(argv[5], "-")) {
 646                         r = parse_options(argv[5]);
 647                         if (r < 0)
 648                                 return r;
 649                 }
 650
 651                 /* A delicious drop of snake oil */
 652                 mlockall(MCL_FUTURE);
 653
 654                 if (arg_header) {
 655                         log_debug("LUKS header: %s", arg_header);
 656                         r = crypt_init(&cd, arg_header);
 657                 } else
 658                         r = crypt_init(&cd, argv[3]);
 659                 if (r < 0)
 660                         return log_error_errno(r, "crypt_init() failed: %m");
 661
 662                 crypt_set_log_callback(cd, cryptsetup_log_glue, NULL);
 663
 664                 status = crypt_status(cd, argv[2]);
 665                 if (IN_SET(status, CRYPT_ACTIVE, CRYPT_BUSY)) {
 666                         log_info("Volume %s already active.", argv[2]);
 667                         return 0;
 668                 }
 669
 670                 if (arg_readonly)
 671                         flags |= CRYPT_ACTIVATE_READONLY;
 672
 673                 if (arg_discards)
 674                         flags |= CRYPT_ACTIVATE_ALLOW_DISCARDS;
 675
 676                 if (arg_timeout == USEC_INFINITY)
 677                         until = 0;
 678                 else
 679                         until = now(CLOCK_MONOTONIC) + arg_timeout;
 680
 681                 arg_key_size = (arg_key_size > 0 ? arg_key_size : (256 / 8));
 682
 683                 if (key_file) {
 684                         struct stat st;
 685
 686                         /* Ideally we'd do this on the open fd, but since this is just a
 687                          * warning it's OK to do this in two steps. */
 688                         if (stat(key_file, &st) >= 0 && S_ISREG(st.st_mode) && (st.st_mode & 0005))
 689                                 log_warning("Key file %s is world-readable. This is not a good idea!", key_file);
 690                 }
 691
 692                 for (tries = 0; arg_tries == 0 || tries < arg_tries; tries++) {
 693                         _cleanup_strv_free_erase_ char **passwords = NULL;
 694
 695                         if (!key_file) {
 696                                 r = get_password(argv[2], argv[3], until, tries == 0 && !arg_verify, &passwords);
 697                                 if (r == -EAGAIN)
 698                                         continue;
 699                                 if (r < 0)
 700                                         return r;
 701                         }
 702
 703                         if (streq_ptr(arg_type, CRYPT_TCRYPT))
 704                                 r = attach_tcrypt(cd, argv[2], key_file, passwords, flags);
 705                         else
 706                                 r = attach_luks_or_plain(cd,
 707                                                          argv[2],
 708                                                          key_file,
 709                                                          arg_header ? argv[3] : NULL,
 710                                                          passwords,
 711                                                          flags);
 712                         if (r >= 0)
 713                                 break;
 714                         if (r == -EAGAIN) {
 715                                 key_file = NULL;
 716                                 continue;
 717                         }
 718                         if (r != -EPERM)
 719                                 return log_error_errno(r, "Failed to activate: %m");
 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                         return -EPERM;
 727                 }
 728
 729         } else if (streq(argv[1], "detach")) {
 730
 731                 r = crypt_init_by_name(&cd, argv[2]);
 732                 if (r == -ENODEV) {
 733                         log_info("Volume %s already inactive.", argv[2]);
 734                         return 0;
 735                 }
 736                 if (r < 0)
 737                         return log_error_errno(r, "crypt_init_by_name() failed: %m");
 738
 739                 crypt_set_log_callback(cd, cryptsetup_log_glue, NULL);
 740
 741                 r = crypt_deactivate(cd, argv[2]);
 742                 if (r < 0)
 743                         return log_error_errno(r, "Failed to deactivate: %m");
 744
 745         } else {
 746                 log_error("Unknown verb %s.", argv[1]);
 747                 return -EINVAL;
 748         }
 749
 750         return 0;
 751 }
 752
 753 DEFINE_MAIN_FUNCTION(run);