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 /* libcryptsetup define for any LUKS version, compatible with libcryptsetup 1.x */
  42 #ifndef CRYPT_LUKS
  43 #define CRYPT_LUKS NULL
  44 #endif
  45
  46 /* internal helper */
  47 #define ANY_LUKS "LUKS"
  48
  49 static const char *arg_type = NULL; /* ANY_LUKS, CRYPT_LUKS1, CRYPT_LUKS2, CRYPT_TCRYPT or CRYPT_PLAIN */
  50 static char *arg_cipher = NULL;
  51 static unsigned arg_key_size = 0;
  52 static int arg_key_slot = CRYPT_ANY_SLOT;
  53 static unsigned arg_keyfile_size = 0;
  54 static unsigned arg_keyfile_offset = 0;
  55 static char *arg_hash = NULL;
  56 static char *arg_header = NULL;
  57 static unsigned arg_tries = 3;
  58 static bool arg_readonly = false;
  59 static bool arg_verify = false;
  60 static bool arg_discards = false;
  61 static bool arg_tcrypt_hidden = false;
  62 static bool arg_tcrypt_system = false;
  63 #ifdef CRYPT_TCRYPT_VERA_MODES
  64 static bool arg_tcrypt_veracrypt = false;
  65 #endif
  66 static char **arg_tcrypt_keyfiles = NULL;
  67 static uint64_t arg_offset = 0;
  68 static uint64_t arg_skip = 0;
  69 static usec_t arg_timeout = USEC_INFINITY;
  70
  71 /* Options Debian's crypttab knows we don't:
  72
  73     precheck=
  74     check=
  75     checkargs=
  76     noearly=
  77     loud=
  78     keyscript=
  79 */
  80
  81 static int parse_one_option(const char *option) {
  82         const char *val;
  83         int r;
  84
  85         assert(option);
  86
  87         /* Handled outside of this tool */
  88         if (STR_IN_SET(option, "noauto", "auto", "nofail", "fail", "_netdev"))
  89                 return 0;
  90
  91         if ((val = startswith(option, "cipher="))) {
  92                 r = free_and_strdup(&arg_cipher, val);
  93                 if (r < 0)
  94                         return log_oom();
  95
  96         } else if ((val = startswith(option, "size="))) {
  97
  98                 r = safe_atou(val, &arg_key_size);
  99                 if (r < 0) {
 100                         log_error_errno(r, "Failed to parse %s, ignoring: %m", option);
 101                         return 0;
 102                 }
 103
 104                 if (arg_key_size % 8) {
 105                         log_error("size= not a multiple of 8, ignoring.");
 106                         return 0;
 107                 }
 108
 109                 arg_key_size /= 8;
 110
 111         } else if ((val = startswith(option, "key-slot="))) {
 112
 113                 arg_type = ANY_LUKS;
 114                 r = safe_atoi(val, &arg_key_slot);
 115                 if (r < 0) {
 116                         log_error_errno(r, "Failed to parse %s, ignoring: %m", option);
 117                         return 0;
 118                 }
 119
 120         } else if ((val = startswith(option, "tcrypt-keyfile="))) {
 121
 122                 arg_type = CRYPT_TCRYPT;
 123                 if (path_is_absolute(val)) {
 124                         if (strv_extend(&arg_tcrypt_keyfiles, val) < 0)
 125                                 return log_oom();
 126                 } else
 127                         log_error("Key file path \"%s\" is not absolute. Ignoring.", val);
 128
 129         } else if ((val = startswith(option, "keyfile-size="))) {
 130
 131                 r = safe_atou(val, &arg_keyfile_size);
 132                 if (r < 0) {
 133                         log_error_errno(r, "Failed to parse %s, ignoring: %m", option);
 134                         return 0;
 135                 }
 136
 137         } else if ((val = startswith(option, "keyfile-offset="))) {
 138
 139                 r = safe_atou(val, &arg_keyfile_offset);
 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, "hash="))) {
 146                 r = free_and_strdup(&arg_hash, val);
 147                 if (r < 0)
 148                         return log_oom();
 149
 150         } else if ((val = startswith(option, "header="))) {
 151                 arg_type = ANY_LUKS;
 152
 153                 if (!path_is_absolute(val)) {
 154                         log_error("Header path \"%s\" is not absolute, refusing.", val);
 155                         return -EINVAL;
 156                 }
 157
 158                 if (arg_header) {
 159                         log_error("Duplicate header= option, refusing.");
 160                         return -EINVAL;
 161                 }
 162
 163                 arg_header = strdup(val);
 164                 if (!arg_header)
 165                         return log_oom();
 166
 167         } else if ((val = startswith(option, "tries="))) {
 168
 169                 r = safe_atou(val, &arg_tries);
 170                 if (r < 0) {
 171                         log_error_errno(r, "Failed to parse %s, ignoring: %m", option);
 172                         return 0;
 173                 }
 174
 175         } else if (STR_IN_SET(option, "readonly", "read-only"))
 176                 arg_readonly = true;
 177         else if (streq(option, "verify"))
 178                 arg_verify = true;
 179         else if (STR_IN_SET(option, "allow-discards", "discard"))
 180                 arg_discards = true;
 181         else if (streq(option, "luks"))
 182                 arg_type = ANY_LUKS;
 183         else if (streq(option, "tcrypt"))
 184                 arg_type = CRYPT_TCRYPT;
 185         else if (streq(option, "tcrypt-hidden")) {
 186                 arg_type = CRYPT_TCRYPT;
 187                 arg_tcrypt_hidden = true;
 188         } else if (streq(option, "tcrypt-system")) {
 189                 arg_type = CRYPT_TCRYPT;
 190                 arg_tcrypt_system = true;
 191         } else if (streq(option, "tcrypt-veracrypt")) {
 192 #ifdef CRYPT_TCRYPT_VERA_MODES
 193                 arg_type = CRYPT_TCRYPT;
 194                 arg_tcrypt_veracrypt = true;
 195 #else
 196                 log_error("This version of cryptsetup does not support tcrypt-veracrypt; refusing.");
 197                 return -EINVAL;
 198 #endif
 199         } else if (STR_IN_SET(option, "plain", "swap", "tmp"))
 200                 arg_type = CRYPT_PLAIN;
 201         else if ((val = startswith(option, "timeout="))) {
 202
 203                 r = parse_sec_fix_0(val, &arg_timeout);
 204                 if (r < 0) {
 205                         log_error_errno(r, "Failed to parse %s, ignoring: %m", option);
 206                         return 0;
 207                 }
 208
 209         } else if ((val = startswith(option, "offset="))) {
 210
 211                 r = safe_atou64(val, &arg_offset);
 212                 if (r < 0)
 213                         return log_error_errno(r, "Failed to parse %s: %m", option);
 214
 215         } else if ((val = startswith(option, "skip="))) {
 216
 217                 r = safe_atou64(val, &arg_skip);
 218                 if (r < 0)
 219                         return log_error_errno(r, "Failed to parse %s: %m", option);
 220
 221         } else if (!streq(option, "none"))
 222                 log_warning("Encountered unknown /etc/crypttab option '%s', ignoring.", option);
 223
 224         return 0;
 225 }
 226
 227 static int parse_options(const char *options) {
 228         const char *word, *state;
 229         size_t l;
 230         int r;
 231
 232         assert(options);
 233
 234         FOREACH_WORD_SEPARATOR(word, l, options, ",", state) {
 235                 _cleanup_free_ char *o;
 236
 237                 o = strndup(word, l);
 238                 if (!o)
 239                         return -ENOMEM;
 240                 r = parse_one_option(o);
 241                 if (r < 0)
 242                         return r;
 243         }
 244
 245         /* sanity-check options */
 246         if (arg_type != NULL && !streq(arg_type, CRYPT_PLAIN)) {
 247                 if (arg_offset)
 248                       log_warning("offset= ignored with type %s", arg_type);
 249                 if (arg_skip)
 250                       log_warning("skip= ignored with type %s", arg_type);
 251         }
 252
 253         return 0;
 254 }
 255
 256 static void log_glue(int level, const char *msg, void *usrptr) {
 257         log_debug("%s", msg);
 258 }
 259
 260 static int disk_major_minor(const char *path, char **ret) {
 261         struct stat st;
 262
 263         assert(path);
 264
 265         if (stat(path, &st) < 0)
 266                 return -errno;
 267
 268         if (!S_ISBLK(st.st_mode))
 269                 return -EINVAL;
 270
 271         if (asprintf(ret, "/dev/block/%d:%d", major(st.st_rdev), minor(st.st_rdev)) < 0)
 272                 return -errno;
 273
 274         return 0;
 275 }
 276
 277 static char* disk_description(const char *path) {
 278
 279         static const char name_fields[] =
 280                 "ID_PART_ENTRY_NAME\0"
 281                 "DM_NAME\0"
 282                 "ID_MODEL_FROM_DATABASE\0"
 283                 "ID_MODEL\0";
 284
 285         _cleanup_(sd_device_unrefp) sd_device *device = NULL;
 286         struct stat st;
 287         const char *i;
 288         int r;
 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         r = sd_device_new_from_devnum(&device, 'b', st.st_rdev);
 299         if (r < 0)
 300                 return NULL;
 301
 302         NULSTR_FOREACH(i, name_fields) {
 303                 const char *name;
 304
 305                 r = sd_device_get_property_value(device, i, &name);
 306                 if (r >= 0 && !isempty(name))
 307                         return strdup(name);
 308         }
 309
 310         return NULL;
 311 }
 312
 313 static char *disk_mount_point(const char *label) {
 314         _cleanup_free_ char *device = NULL;
 315         _cleanup_endmntent_ FILE *f = NULL;
 316         struct mntent *m;
 317
 318         /* Yeah, we don't support native systemd unit files here for now */
 319
 320         if (asprintf(&device, "/dev/mapper/%s", label) < 0)
 321                 return NULL;
 322
 323         f = setmntent("/etc/fstab", "re");
 324         if (!f)
 325                 return NULL;
 326
 327         while ((m = getmntent(f)))
 328                 if (path_equal(m->mnt_fsname, device))
 329                         return strdup(m->mnt_dir);
 330
 331         return NULL;
 332 }
 333
 334 static int get_password(const char *vol, const char *src, usec_t until, bool accept_cached, char ***ret) {
 335         _cleanup_free_ char *description = NULL, *name_buffer = NULL, *mount_point = NULL, *maj_min = NULL, *text = NULL, *escaped_name = NULL;
 336         _cleanup_strv_free_erase_ char **passwords = NULL;
 337         const char *name = NULL;
 338         char **p, *id;
 339         int r = 0;
 340
 341         assert(vol);
 342         assert(src);
 343         assert(ret);
 344
 345         description = disk_description(src);
 346         mount_point = disk_mount_point(vol);
 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         if (src)
 370                 (void) disk_major_minor(src, &maj_min);
 371
 372         if (maj_min) {
 373                 escaped_name = maj_min;
 374                 maj_min = NULL;
 375         } else
 376                 escaped_name = cescape(name);
 377
 378         if (!escaped_name)
 379                 return log_oom();
 380
 381         id = strjoina("cryptsetup:", escaped_name);
 382
 383         r = ask_password_auto(text, "drive-harddisk", id, "cryptsetup", until,
 384                               ASK_PASSWORD_PUSH_CACHE | (accept_cached*ASK_PASSWORD_ACCEPT_CACHED),
 385                               &passwords);
 386         if (r < 0)
 387                 return log_error_errno(r, "Failed to query password: %m");
 388
 389         if (arg_verify) {
 390                 _cleanup_strv_free_erase_ char **passwords2 = NULL;
 391
 392                 assert(strv_length(passwords) == 1);
 393
 394                 if (asprintf(&text, "Please enter passphrase for disk %s! (verification)", name) < 0)
 395                         return log_oom();
 396
 397                 id = strjoina("cryptsetup-verification:", escaped_name);
 398
 399                 r = ask_password_auto(text, "drive-harddisk", id, "cryptsetup", until, ASK_PASSWORD_PUSH_CACHE, &passwords2);
 400                 if (r < 0)
 401                         return log_error_errno(r, "Failed to query verification password: %m");
 402
 403                 assert(strv_length(passwords2) == 1);
 404
 405                 if (!streq(passwords[0], passwords2[0])) {
 406                         log_warning("Passwords did not match, retrying.");
 407                         return -EAGAIN;
 408                 }
 409         }
 410
 411         strv_uniq(passwords);
 412
 413         STRV_FOREACH(p, passwords) {
 414                 char *c;
 415
 416                 if (strlen(*p)+1 >= arg_key_size)
 417                         continue;
 418
 419                 /* Pad password if necessary */
 420                 c = new(char, arg_key_size);
 421                 if (!c)
 422                         return log_oom();
 423
 424                 strncpy(c, *p, arg_key_size);
 425                 free(*p);
 426                 *p = c;
 427         }
 428
 429         *ret = passwords;
 430         passwords = NULL;
 431
 432         return 0;
 433 }
 434
 435 static int attach_tcrypt(
 436                 struct crypt_device *cd,
 437                 const char *name,
 438                 const char *key_file,
 439                 char **passwords,
 440                 uint32_t flags) {
 441
 442         int r = 0;
 443         _cleanup_free_ char *passphrase = NULL;
 444         struct crypt_params_tcrypt params = {
 445                 .flags = CRYPT_TCRYPT_LEGACY_MODES,
 446                 .keyfiles = (const char **)arg_tcrypt_keyfiles,
 447                 .keyfiles_count = strv_length(arg_tcrypt_keyfiles)
 448         };
 449
 450         assert(cd);
 451         assert(name);
 452         assert(key_file || (passwords && passwords[0]));
 453
 454         if (arg_tcrypt_hidden)
 455                 params.flags |= CRYPT_TCRYPT_HIDDEN_HEADER;
 456
 457         if (arg_tcrypt_system)
 458                 params.flags |= CRYPT_TCRYPT_SYSTEM_HEADER;
 459
 460 #ifdef CRYPT_TCRYPT_VERA_MODES
 461         if (arg_tcrypt_veracrypt)
 462                 params.flags |= CRYPT_TCRYPT_VERA_MODES;
 463 #endif
 464
 465         if (key_file) {
 466                 r = read_one_line_file(key_file, &passphrase);
 467                 if (r < 0) {
 468                         log_error_errno(r, "Failed to read password file '%s': %m", key_file);
 469                         return -EAGAIN;
 470                 }
 471
 472                 params.passphrase = passphrase;
 473         } else
 474                 params.passphrase = passwords[0];
 475         params.passphrase_size = strlen(params.passphrase);
 476
 477         r = crypt_load(cd, CRYPT_TCRYPT, &params);
 478         if (r < 0) {
 479                 if (key_file && r == -EPERM) {
 480                         log_error("Failed to activate using password file '%s'.", key_file);
 481                         return -EAGAIN;
 482                 }
 483                 return r;
 484         }
 485
 486         return crypt_activate_by_volume_key(cd, name, NULL, 0, flags);
 487 }
 488
 489 static int attach_luks_or_plain(struct crypt_device *cd,
 490                                 const char *name,
 491                                 const char *key_file,
 492                                 const char *data_device,
 493                                 char **passwords,
 494                                 uint32_t flags) {
 495         int r = 0;
 496         bool pass_volume_key = false;
 497
 498         assert(cd);
 499         assert(name);
 500         assert(key_file || passwords);
 501
 502         if (!arg_type || STR_IN_SET(arg_type, ANY_LUKS, CRYPT_LUKS1)) {
 503                 r = crypt_load(cd, CRYPT_LUKS, NULL);
 504                 if (r < 0) {
 505                         log_error("crypt_load() failed on device %s.\n", crypt_get_device_name(cd));
 506                         return r;
 507                 }
 508
 509                 if (data_device)
 510                         r = crypt_set_data_device(cd, data_device);
 511         }
 512
 513         if ((!arg_type && r < 0) || streq_ptr(arg_type, CRYPT_PLAIN)) {
 514                 struct crypt_params_plain params = {
 515                         .offset = arg_offset,
 516                         .skip = arg_skip,
 517                 };
 518                 const char *cipher, *cipher_mode;
 519                 _cleanup_free_ char *truncated_cipher = NULL;
 520
 521                 if (arg_hash) {
 522                         /* plain isn't a real hash type. it just means "use no hash" */
 523                         if (!streq(arg_hash, "plain"))
 524                                 params.hash = arg_hash;
 525                 } else if (!key_file)
 526                         /* for CRYPT_PLAIN, the behaviour of cryptsetup
 527                          * package is to not hash when a key file is provided */
 528                         params.hash = "ripemd160";
 529
 530                 if (arg_cipher) {
 531                         size_t l;
 532
 533                         l = strcspn(arg_cipher, "-");
 534                         truncated_cipher = strndup(arg_cipher, l);
 535                         if (!truncated_cipher)
 536                                 return log_oom();
 537
 538                         cipher = truncated_cipher;
 539                         cipher_mode = arg_cipher[l] ? arg_cipher+l+1 : "plain";
 540                 } else {
 541                         cipher = "aes";
 542                         cipher_mode = "cbc-essiv:sha256";
 543                 }
 544
 545                 /* for CRYPT_PLAIN limit reads
 546                  * from keyfile to key length, and
 547                  * ignore keyfile-size */
 548                 arg_keyfile_size = arg_key_size;
 549
 550                 /* In contrast to what the name
 551                  * crypt_setup() might suggest this
 552                  * doesn't actually format anything,
 553                  * it just configures encryption
 554                  * parameters when used for plain
 555                  * mode. */
 556                 r = crypt_format(cd, CRYPT_PLAIN, cipher, cipher_mode, NULL, NULL, arg_keyfile_size, &params);
 557
 558                 /* hash == NULL implies the user passed "plain" */
 559                 pass_volume_key = (params.hash == NULL);
 560         }
 561
 562         if (r < 0)
 563                 return log_error_errno(r, "Loading of cryptographic parameters failed: %m");
 564
 565         log_info("Set cipher %s, mode %s, key size %i bits for device %s.",
 566                  crypt_get_cipher(cd),
 567                  crypt_get_cipher_mode(cd),
 568                  crypt_get_volume_key_size(cd)*8,
 569                  crypt_get_device_name(cd));
 570
 571         if (key_file) {
 572                 r = crypt_activate_by_keyfile_offset(cd, name, arg_key_slot, key_file, arg_keyfile_size, arg_keyfile_offset, flags);
 573                 if (r < 0) {
 574                         log_error_errno(r, "Failed to activate with key file '%s': %m", key_file);
 575                         return -EAGAIN;
 576                 }
 577         } else {
 578                 char **p;
 579
 580                 STRV_FOREACH(p, passwords) {
 581                         if (pass_volume_key)
 582                                 r = crypt_activate_by_volume_key(cd, name, *p, arg_key_size, flags);
 583                         else
 584                                 r = crypt_activate_by_passphrase(cd, name, arg_key_slot, *p, strlen(*p), flags);
 585
 586                         if (r >= 0)
 587                                 break;
 588                 }
 589         }
 590
 591         return r;
 592 }
 593
 594 static int help(void) {
 595
 596         printf("%s attach VOLUME SOURCEDEVICE [PASSWORD] [OPTIONS]\n"
 597                "%s detach VOLUME\n\n"
 598                "Attaches or detaches an encrypted block device.\n",
 599                program_invocation_short_name,
 600                program_invocation_short_name);
 601
 602         return 0;
 603 }
 604
 605 int main(int argc, char *argv[]) {
 606         struct crypt_device *cd = NULL;
 607         int r = -EINVAL;
 608
 609         if (argc <= 1) {
 610                 r = help();
 611                 goto finish;
 612         }
 613
 614         if (argc < 3) {
 615                 log_error("This program requires at least two arguments.");
 616                 goto finish;
 617         }
 618
 619         log_set_target(LOG_TARGET_AUTO);
 620         log_parse_environment();
 621         log_open();
 622
 623         umask(0022);
 624
 625         if (streq(argv[1], "attach")) {
 626                 uint32_t flags = 0;
 627                 unsigned tries;
 628                 usec_t until;
 629                 crypt_status_info status;
 630                 const char *key_file = NULL;
 631
 632                 /* Arguments: systemd-cryptsetup attach VOLUME SOURCE-DEVICE [PASSWORD] [OPTIONS] */
 633
 634                 if (argc < 4) {
 635                         log_error("attach requires at least two arguments.");
 636                         goto finish;
 637                 }
 638
 639                 if (argc >= 5 &&
 640                     argv[4][0] &&
 641                     !streq(argv[4], "-") &&
 642                     !streq(argv[4], "none")) {
 643
 644                         if (!path_is_absolute(argv[4]))
 645                                 log_error("Password file path '%s' is not absolute. Ignoring.", argv[4]);
 646                         else
 647                                 key_file = argv[4];
 648                 }
 649
 650                 if (argc >= 6 && argv[5][0] && !streq(argv[5], "-")) {
 651                         if (parse_options(argv[5]) < 0)
 652                                 goto finish;
 653                 }
 654
 655                 /* A delicious drop of snake oil */
 656                 mlockall(MCL_FUTURE);
 657
 658                 if (arg_header) {
 659                         log_debug("LUKS header: %s", arg_header);
 660                         r = crypt_init(&cd, arg_header);
 661                 } else
 662                         r = crypt_init(&cd, argv[3]);
 663                 if (r < 0) {
 664                         log_error_errno(r, "crypt_init() failed: %m");
 665                         goto finish;
 666                 }
 667
 668                 crypt_set_log_callback(cd, log_glue, NULL);
 669
 670                 status = crypt_status(cd, argv[2]);
 671                 if (IN_SET(status, CRYPT_ACTIVE, CRYPT_BUSY)) {
 672                         log_info("Volume %s already active.", argv[2]);
 673                         r = 0;
 674                         goto finish;
 675                 }
 676
 677                 if (arg_readonly)
 678                         flags |= CRYPT_ACTIVATE_READONLY;
 679
 680                 if (arg_discards)
 681                         flags |= CRYPT_ACTIVATE_ALLOW_DISCARDS;
 682
 683                 if (arg_timeout == USEC_INFINITY)
 684                         until = 0;
 685                 else
 686                         until = now(CLOCK_MONOTONIC) + arg_timeout;
 687
 688                 arg_key_size = (arg_key_size > 0 ? arg_key_size : (256 / 8));
 689
 690                 if (key_file) {
 691                         struct stat st;
 692
 693                         /* Ideally we'd do this on the open fd, but since this is just a
 694                          * warning it's OK to do this in two steps. */
 695                         if (stat(key_file, &st) >= 0 && S_ISREG(st.st_mode) && (st.st_mode & 0005))
 696                                 log_warning("Key file %s is world-readable. This is not a good idea!", key_file);
 697                 }
 698
 699                 for (tries = 0; arg_tries == 0 || tries < arg_tries; tries++) {
 700                         _cleanup_strv_free_erase_ char **passwords = NULL;
 701
 702                         if (!key_file) {
 703                                 r = get_password(argv[2], argv[3], until, tries == 0 && !arg_verify, &passwords);
 704                                 if (r == -EAGAIN)
 705                                         continue;
 706                                 if (r < 0)
 707                                         goto finish;
 708                         }
 709
 710                         if (streq_ptr(arg_type, CRYPT_TCRYPT))
 711                                 r = attach_tcrypt(cd, argv[2], key_file, passwords, flags);
 712                         else
 713                                 r = attach_luks_or_plain(cd,
 714                                                          argv[2],
 715                                                          key_file,
 716                                                          arg_header ? argv[3] : NULL,
 717                                                          passwords,
 718                                                          flags);
 719                         if (r >= 0)
 720                                 break;
 721                         if (r == -EAGAIN) {
 722                                 key_file = NULL;
 723                                 continue;
 724                         }
 725                         if (r != -EPERM) {
 726                                 log_error_errno(r, "Failed to activate: %m");
 727                                 goto finish;
 728                         }
 729
 730                         log_warning("Invalid passphrase.");
 731                 }
 732
 733                 if (arg_tries != 0 && tries >= arg_tries) {
 734                         log_error("Too many attempts; giving up.");
 735                         r = -EPERM;
 736                         goto finish;
 737                 }
 738
 739         } else if (streq(argv[1], "detach")) {
 740
 741                 r = crypt_init_by_name(&cd, argv[2]);
 742                 if (r == -ENODEV) {
 743                         log_info("Volume %s already inactive.", argv[2]);
 744                         r = 0;
 745                         goto finish;
 746                 }
 747                 if (r < 0) {
 748                         log_error_errno(r, "crypt_init_by_name() failed: %m");
 749                         goto finish;
 750                 }
 751
 752                 crypt_set_log_callback(cd, log_glue, NULL);
 753
 754                 r = crypt_deactivate(cd, argv[2]);
 755                 if (r < 0) {
 756                         log_error_errno(r, "Failed to deactivate: %m");
 757                         goto finish;
 758                 }
 759
 760         } else {
 761                 log_error("Unknown verb %s.", argv[1]);
 762                 goto finish;
 763         }
 764
 765         r = 0;
 766
 767 finish:
 768         if (cd)
 769                 crypt_free(cd);
 770
 771         free(arg_cipher);
 772         free(arg_hash);
 773         free(arg_header);
 774         strv_free(arg_tcrypt_keyfiles);
 775
 776         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 777 }