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                         return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
 178                                                "Header path \"%s\" is not absolute, refusing.", val);
 179
 180                 if (arg_header)
 181                         return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
 182                                                "Duplicate header= option, refusing.");
 183
 184                 arg_header = strdup(val);
 185                 if (!arg_header)
 186                         return log_oom();
 187
 188         } else if ((val = startswith(option, "tries="))) {
 189
 190                 r = safe_atou(val, &arg_tries);
 191                 if (r < 0) {
 192                         log_error_errno(r, "Failed to parse %s, ignoring: %m", option);
 193                         return 0;
 194                 }
 195
 196         } else if (STR_IN_SET(option, "readonly", "read-only"))
 197                 arg_readonly = true;
 198         else if (streq(option, "verify"))
 199                 arg_verify = true;
 200         else if (STR_IN_SET(option, "allow-discards", "discard"))
 201                 arg_discards = true;
 202         else if (streq(option, "luks"))
 203                 arg_type = ANY_LUKS;
 204         else if (streq(option, "tcrypt"))
 205                 arg_type = CRYPT_TCRYPT;
 206         else if (streq(option, "tcrypt-hidden")) {
 207                 arg_type = CRYPT_TCRYPT;
 208                 arg_tcrypt_hidden = true;
 209         } else if (streq(option, "tcrypt-system")) {
 210                 arg_type = CRYPT_TCRYPT;
 211                 arg_tcrypt_system = true;
 212         } else if (streq(option, "tcrypt-veracrypt")) {
 213 #ifdef CRYPT_TCRYPT_VERA_MODES
 214                 arg_type = CRYPT_TCRYPT;
 215                 arg_tcrypt_veracrypt = true;
 216 #else
 217                 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
 218                                        "This version of cryptsetup does not support tcrypt-veracrypt; refusing.");
 219 #endif
 220         } else if (STR_IN_SET(option, "plain", "swap", "tmp"))
 221                 arg_type = CRYPT_PLAIN;
 222         else if ((val = startswith(option, "timeout="))) {
 223
 224                 r = parse_sec_fix_0(val, &arg_timeout);
 225                 if (r < 0) {
 226                         log_error_errno(r, "Failed to parse %s, ignoring: %m", option);
 227                         return 0;
 228                 }
 229
 230         } else if ((val = startswith(option, "offset="))) {
 231
 232                 r = safe_atou64(val, &arg_offset);
 233                 if (r < 0)
 234                         return log_error_errno(r, "Failed to parse %s: %m", option);
 235
 236         } else if ((val = startswith(option, "skip="))) {
 237
 238                 r = safe_atou64(val, &arg_skip);
 239                 if (r < 0)
 240                         return log_error_errno(r, "Failed to parse %s: %m", option);
 241
 242         } else if (!streq(option, "none"))
 243                 log_warning("Encountered unknown /etc/crypttab option '%s', ignoring.", option);
 244
 245         return 0;
 246 }
 247
 248 static int parse_options(const char *options) {
 249         const char *word, *state;
 250         size_t l;
 251         int r;
 252
 253         assert(options);
 254
 255         FOREACH_WORD_SEPARATOR(word, l, options, ",", state) {
 256                 _cleanup_free_ char *o;
 257
 258                 o = strndup(word, l);
 259                 if (!o)
 260                         return -ENOMEM;
 261                 r = parse_one_option(o);
 262                 if (r < 0)
 263                         return r;
 264         }
 265
 266         /* sanity-check options */
 267         if (arg_type != NULL && !streq(arg_type, CRYPT_PLAIN)) {
 268                 if (arg_offset)
 269                       log_warning("offset= ignored with type %s", arg_type);
 270                 if (arg_skip)
 271                       log_warning("skip= ignored with type %s", arg_type);
 272         }
 273
 274         return 0;
 275 }
 276
 277 static char* disk_description(const char *path) {
 278         static const char name_fields[] =
 279                 "ID_PART_ENTRY_NAME\0"
 280                 "DM_NAME\0"
 281                 "ID_MODEL_FROM_DATABASE\0"
 282                 "ID_MODEL\0";
 283
 284         _cleanup_(sd_device_unrefp) sd_device *device = NULL;
 285         const char *i, *name;
 286         struct stat st;
 287
 288         assert(path);
 289
 290         if (stat(path, &st) < 0)
 291                 return NULL;
 292
 293         if (!S_ISBLK(st.st_mode))
 294                 return NULL;
 295
 296         if (sd_device_new_from_devnum(&device, 'b', st.st_rdev) < 0)
 297                 return NULL;
 298
 299         NULSTR_FOREACH(i, name_fields)
 300                 if (sd_device_get_property_value(device, i, &name) >= 0 &&
 301                     !isempty(name))
 302                         return strdup(name);
 303
 304         return NULL;
 305 }
 306
 307 static char *disk_mount_point(const char *label) {
 308         _cleanup_free_ char *device = NULL;
 309         _cleanup_endmntent_ FILE *f = NULL;
 310         struct mntent *m;
 311
 312         /* Yeah, we don't support native systemd unit files here for now */
 313
 314         if (asprintf(&device, "/dev/mapper/%s", label) < 0)
 315                 return NULL;
 316
 317         f = setmntent("/etc/fstab", "re");
 318         if (!f)
 319                 return NULL;
 320
 321         while ((m = getmntent(f)))
 322                 if (path_equal(m->mnt_fsname, device))
 323                         return strdup(m->mnt_dir);
 324
 325         return NULL;
 326 }
 327
 328 static int get_password(const char *vol, const char *src, usec_t until, bool accept_cached, char ***ret) {
 329         _cleanup_free_ char *description = NULL, *name_buffer = NULL, *mount_point = NULL, *text = NULL, *disk_path = NULL;
 330         _cleanup_strv_free_erase_ char **passwords = NULL;
 331         const char *name = NULL;
 332         char **p, *id;
 333         int r = 0;
 334
 335         assert(vol);
 336         assert(src);
 337         assert(ret);
 338
 339         description = disk_description(src);
 340         mount_point = disk_mount_point(vol);
 341
 342         disk_path = cescape(src);
 343         if (!disk_path)
 344                 return log_oom();
 345
 346         if (description && streq(vol, description))
 347                 /* If the description string is simply the
 348                  * volume name, then let's not show this
 349                  * twice */
 350                 description = mfree(description);
 351
 352         if (mount_point && description)
 353                 r = asprintf(&name_buffer, "%s (%s) on %s", description, vol, mount_point);
 354         else if (mount_point)
 355                 r = asprintf(&name_buffer, "%s on %s", vol, mount_point);
 356         else if (description)
 357                 r = asprintf(&name_buffer, "%s (%s)", description, vol);
 358
 359         if (r < 0)
 360                 return log_oom();
 361
 362         name = name_buffer ? name_buffer : vol;
 363
 364         if (asprintf(&text, "Please enter passphrase for disk %s:", name) < 0)
 365                 return log_oom();
 366
 367         id = strjoina("cryptsetup:", disk_path);
 368
 369         r = ask_password_auto(text, "drive-harddisk", id, "cryptsetup", until,
 370                               ASK_PASSWORD_PUSH_CACHE | (accept_cached*ASK_PASSWORD_ACCEPT_CACHED),
 371                               &passwords);
 372         if (r < 0)
 373                 return log_error_errno(r, "Failed to query password: %m");
 374
 375         if (arg_verify) {
 376                 _cleanup_strv_free_erase_ char **passwords2 = NULL;
 377
 378                 assert(strv_length(passwords) == 1);
 379
 380                 if (asprintf(&text, "Please enter passphrase for disk %s (verification):", name) < 0)
 381                         return log_oom();
 382
 383                 id = strjoina("cryptsetup-verification:", disk_path);
 384
 385                 r = ask_password_auto(text, "drive-harddisk", id, "cryptsetup", until, ASK_PASSWORD_PUSH_CACHE, &passwords2);
 386                 if (r < 0)
 387                         return log_error_errno(r, "Failed to query verification password: %m");
 388
 389                 assert(strv_length(passwords2) == 1);
 390
 391                 if (!streq(passwords[0], passwords2[0])) {
 392                         log_warning("Passwords did not match, retrying.");
 393                         return -EAGAIN;
 394                 }
 395         }
 396
 397         strv_uniq(passwords);
 398
 399         STRV_FOREACH(p, passwords) {
 400                 char *c;
 401
 402                 if (strlen(*p)+1 >= arg_key_size)
 403                         continue;
 404
 405                 /* Pad password if necessary */
 406                 c = new(char, arg_key_size);
 407                 if (!c)
 408                         return log_oom();
 409
 410                 strncpy(c, *p, arg_key_size);
 411                 free_and_replace(*p, c);
 412         }
 413
 414         *ret = TAKE_PTR(passwords);
 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 #ifdef CRYPT_TCRYPT_VERA_MODES
 445         if (arg_tcrypt_veracrypt)
 446                 params.flags |= CRYPT_TCRYPT_VERA_MODES;
 447 #endif
 448
 449         if (key_file) {
 450                 r = read_one_line_file(key_file, &passphrase);
 451                 if (r < 0) {
 452                         log_error_errno(r, "Failed to read password file '%s': %m", key_file);
 453                         return -EAGAIN;
 454                 }
 455
 456                 params.passphrase = passphrase;
 457         } else
 458                 params.passphrase = passwords[0];
 459         params.passphrase_size = strlen(params.passphrase);
 460
 461         r = crypt_load(cd, CRYPT_TCRYPT, &params);
 462         if (r < 0) {
 463                 if (key_file && r == -EPERM)
 464                         return log_error_errno(SYNTHETIC_ERRNO(EAGAIN),
 465                                                "Failed to activate using password file '%s'.",
 466                                                key_file);
 467                 return r;
 468         }
 469
 470         return crypt_activate_by_volume_key(cd, name, NULL, 0, flags);
 471 }
 472
 473 static int attach_luks_or_plain(struct crypt_device *cd,
 474                                 const char *name,
 475                                 const char *key_file,
 476                                 const char *data_device,
 477                                 char **passwords,
 478                                 uint32_t flags) {
 479         int r = 0;
 480         bool pass_volume_key = false;
 481
 482         assert(cd);
 483         assert(name);
 484         assert(key_file || passwords);
 485
 486         if (!arg_type || STR_IN_SET(arg_type, ANY_LUKS, CRYPT_LUKS1)) {
 487                 r = crypt_load(cd, CRYPT_LUKS, NULL);
 488                 if (r < 0) {
 489                         log_error("crypt_load() failed on device %s.\n", crypt_get_device_name(cd));
 490                         return r;
 491                 }
 492
 493                 if (data_device)
 494                         r = crypt_set_data_device(cd, data_device);
 495         }
 496
 497         if ((!arg_type && r < 0) || streq_ptr(arg_type, CRYPT_PLAIN)) {
 498                 struct crypt_params_plain params = {
 499                         .offset = arg_offset,
 500                         .skip = arg_skip,
 501 #if HAVE_LIBCRYPTSETUP_SECTOR_SIZE
 502                         .sector_size = arg_sector_size,
 503 #endif
 504                 };
 505                 const char *cipher, *cipher_mode;
 506                 _cleanup_free_ char *truncated_cipher = NULL;
 507
 508                 if (arg_hash) {
 509                         /* plain isn't a real hash type. it just means "use no hash" */
 510                         if (!streq(arg_hash, "plain"))
 511                                 params.hash = arg_hash;
 512                 } else if (!key_file)
 513                         /* for CRYPT_PLAIN, the behaviour of cryptsetup
 514                          * package is to not hash when a key file is provided */
 515                         params.hash = "ripemd160";
 516
 517                 if (arg_cipher) {
 518                         size_t l;
 519
 520                         l = strcspn(arg_cipher, "-");
 521                         truncated_cipher = strndup(arg_cipher, l);
 522                         if (!truncated_cipher)
 523                                 return log_oom();
 524
 525                         cipher = truncated_cipher;
 526                         cipher_mode = arg_cipher[l] ? arg_cipher+l+1 : "plain";
 527                 } else {
 528                         cipher = "aes";
 529                         cipher_mode = "cbc-essiv:sha256";
 530                 }
 531
 532                 /* for CRYPT_PLAIN limit reads
 533                  * from keyfile to key length, and
 534                  * ignore keyfile-size */
 535                 arg_keyfile_size = arg_key_size;
 536
 537                 /* In contrast to what the name
 538                  * crypt_setup() might suggest this
 539                  * doesn't actually format anything,
 540                  * it just configures encryption
 541                  * parameters when used for plain
 542                  * mode. */
 543                 r = crypt_format(cd, CRYPT_PLAIN, cipher, cipher_mode, NULL, NULL, arg_keyfile_size, &params);
 544
 545                 /* hash == NULL implies the user passed "plain" */
 546                 pass_volume_key = (params.hash == NULL);
 547         }
 548
 549         if (r < 0)
 550                 return log_error_errno(r, "Loading of cryptographic parameters failed: %m");
 551
 552         log_info("Set cipher %s, mode %s, key size %i bits for device %s.",
 553                  crypt_get_cipher(cd),
 554                  crypt_get_cipher_mode(cd),
 555                  crypt_get_volume_key_size(cd)*8,
 556                  crypt_get_device_name(cd));
 557
 558         if (key_file) {
 559                 r = crypt_activate_by_keyfile_offset(cd, name, arg_key_slot, key_file, arg_keyfile_size, arg_keyfile_offset, flags);
 560                 if (r < 0) {
 561                         log_error_errno(r, "Failed to activate with key file '%s': %m", key_file);
 562                         return -EAGAIN;
 563                 }
 564         } else {
 565                 char **p;
 566
 567                 STRV_FOREACH(p, passwords) {
 568                         if (pass_volume_key)
 569                                 r = crypt_activate_by_volume_key(cd, name, *p, arg_key_size, flags);
 570                         else
 571                                 r = crypt_activate_by_passphrase(cd, name, arg_key_slot, *p, strlen(*p), flags);
 572
 573                         if (r >= 0)
 574                                 break;
 575                 }
 576         }
 577
 578         return r;
 579 }
 580
 581 static int help(void) {
 582         _cleanup_free_ char *link = NULL;
 583         int r;
 584
 585         r = terminal_urlify_man("systemd-cryptsetup@.service", "8", &link);
 586         if (r < 0)
 587                 return log_oom();
 588
 589         printf("%s attach VOLUME SOURCEDEVICE [PASSWORD] [OPTIONS]\n"
 590                "%s detach VOLUME\n\n"
 591                "Attaches or detaches an encrypted block device.\n"
 592                "\nSee the %s for details.\n"
 593                , program_invocation_short_name
 594                , program_invocation_short_name
 595                , link
 596         );
 597
 598         return 0;
 599 }
 600
 601 static int run(int argc, char *argv[]) {
 602         _cleanup_(crypt_freep) struct crypt_device *cd = NULL;
 603         int r;
 604
 605         if (argc <= 1)
 606                 return help();
 607
 608         if (argc < 3) {
 609                 log_error("This program requires at least two arguments.");
 610                 return -EINVAL;
 611         }
 612
 613         log_setup_service();
 614
 615         umask(0022);
 616
 617         if (streq(argv[1], "attach")) {
 618                 uint32_t flags = 0;
 619                 unsigned tries;
 620                 usec_t until;
 621                 crypt_status_info status;
 622                 const char *key_file = NULL;
 623
 624                 /* Arguments: systemd-cryptsetup attach VOLUME SOURCE-DEVICE [PASSWORD] [OPTIONS] */
 625
 626                 if (argc < 4) {
 627                         log_error("attach requires at least two arguments.");
 628                         return -EINVAL;
 629                 }
 630
 631                 if (argc >= 5 &&
 632                     argv[4][0] &&
 633                     !streq(argv[4], "-") &&
 634                     !streq(argv[4], "none")) {
 635
 636                         if (!path_is_absolute(argv[4]))
 637                                 log_error("Password file path '%s' is not absolute. Ignoring.", argv[4]);
 638                         else
 639                                 key_file = argv[4];
 640                 }
 641
 642                 if (argc >= 6 && argv[5][0] && !streq(argv[5], "-")) {
 643                         r = parse_options(argv[5]);
 644                         if (r < 0)
 645                                 return r;
 646                 }
 647
 648                 /* A delicious drop of snake oil */
 649                 mlockall(MCL_FUTURE);
 650
 651                 if (arg_header) {
 652                         log_debug("LUKS header: %s", arg_header);
 653                         r = crypt_init(&cd, arg_header);
 654                 } else
 655                         r = crypt_init(&cd, argv[3]);
 656                 if (r < 0)
 657                         return log_error_errno(r, "crypt_init() failed: %m");
 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                         return 0;
 665                 }
 666
 667                 if (arg_readonly)
 668                         flags |= CRYPT_ACTIVATE_READONLY;
 669
 670                 if (arg_discards)
 671                         flags |= CRYPT_ACTIVATE_ALLOW_DISCARDS;
 672
 673                 if (arg_timeout == USEC_INFINITY)
 674                         until = 0;
 675                 else
 676                         until = now(CLOCK_MONOTONIC) + arg_timeout;
 677
 678                 arg_key_size = (arg_key_size > 0 ? arg_key_size : (256 / 8));
 679
 680                 if (key_file) {
 681                         struct stat st;
 682
 683                         /* Ideally we'd do this on the open fd, but since this is just a
 684                          * warning it's OK to do this in two steps. */
 685                         if (stat(key_file, &st) >= 0 && S_ISREG(st.st_mode) && (st.st_mode & 0005))
 686                                 log_warning("Key file %s is world-readable. This is not a good idea!", key_file);
 687                 }
 688
 689                 for (tries = 0; arg_tries == 0 || tries < arg_tries; tries++) {
 690                         _cleanup_strv_free_erase_ char **passwords = NULL;
 691
 692                         if (!key_file) {
 693                                 r = get_password(argv[2], argv[3], until, tries == 0 && !arg_verify, &passwords);
 694                                 if (r == -EAGAIN)
 695                                         continue;
 696                                 if (r < 0)
 697                                         return r;
 698                         }
 699
 700                         if (streq_ptr(arg_type, CRYPT_TCRYPT))
 701                                 r = attach_tcrypt(cd, argv[2], key_file, passwords, flags);
 702                         else
 703                                 r = attach_luks_or_plain(cd,
 704                                                          argv[2],
 705                                                          key_file,
 706                                                          arg_header ? argv[3] : NULL,
 707                                                          passwords,
 708                                                          flags);
 709                         if (r >= 0)
 710                                 break;
 711                         if (r == -EAGAIN) {
 712                                 key_file = NULL;
 713                                 continue;
 714                         }
 715                         if (r != -EPERM)
 716                                 return log_error_errno(r, "Failed to activate: %m");
 717
 718                         log_warning("Invalid passphrase.");
 719                 }
 720
 721                 if (arg_tries != 0 && tries >= arg_tries) {
 722                         log_error("Too many attempts; giving up.");
 723                         return -EPERM;
 724                 }
 725
 726         } else if (streq(argv[1], "detach")) {
 727
 728                 r = crypt_init_by_name(&cd, argv[2]);
 729                 if (r == -ENODEV) {
 730                         log_info("Volume %s already inactive.", argv[2]);
 731                         return 0;
 732                 }
 733                 if (r < 0)
 734                         return log_error_errno(r, "crypt_init_by_name() failed: %m");
 735
 736                 crypt_set_log_callback(cd, cryptsetup_log_glue, NULL);
 737
 738                 r = crypt_deactivate(cd, argv[2]);
 739                 if (r < 0)
 740                         return log_error_errno(r, "Failed to deactivate: %m");
 741
 742         } else {
 743                 log_error("Unknown verb %s.", argv[1]);
 744                 return -EINVAL;
 745         }
 746
 747         return 0;
 748 }
 749
 750 DEFINE_MAIN_FUNCTION(run);