src/shared/dissect-image.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include <sys/mount.h>
   4 #include <sys/prctl.h>
   5 #include <sys/wait.h>
   6
   7 #include "sd-device.h"
   8 #include "sd-id128.h"
   9
  10 #include "architecture.h"
  11 #include "ask-password-api.h"
  12 #include "blkid-util.h"
  13 #include "blockdev-util.h"
  14 #include "copy.h"
  15 #include "crypt-util.h"
  16 #include "def.h"
  17 #include "device-nodes.h"
  18 #include "device-util.h"
  19 #include "dissect-image.h"
  20 #include "env-file.h"
  21 #include "fd-util.h"
  22 #include "fileio.h"
  23 #include "fs-util.h"
  24 #include "gpt.h"
  25 #include "hexdecoct.h"
  26 #include "hostname-util.h"
  27 #include "id128-util.h"
  28 #include "linux-3.13/dm-ioctl.h"
  29 #include "missing.h"
  30 #include "mount-util.h"
  31 #include "mountpoint-util.h"
  32 #include "os-util.h"
  33 #include "path-util.h"
  34 #include "process-util.h"
  35 #include "raw-clone.h"
  36 #include "signal-util.h"
  37 #include "stat-util.h"
  38 #include "stdio-util.h"
  39 #include "string-table.h"
  40 #include "string-util.h"
  41 #include "strv.h"
  42 #include "tmpfile-util.h"
  43 #include "user-util.h"
  44 #include "xattr-util.h"
  45
  46 int probe_filesystem(const char *node, char **ret_fstype) {
  47         /* Try to find device content type and return it in *ret_fstype. If nothing is found,
  48          * 0/NULL will be returned. -EUCLEAN will be returned for ambigous results, and an
  49          * different error otherwise. */
  50
  51 #if HAVE_BLKID
  52         _cleanup_(blkid_free_probep) blkid_probe b = NULL;
  53         const char *fstype;
  54         int r;
  55
  56         errno = 0;
  57         b = blkid_new_probe_from_filename(node);
  58         if (!b)
  59                 return -errno ?: -ENOMEM;
  60
  61         blkid_probe_enable_superblocks(b, 1);
  62         blkid_probe_set_superblocks_flags(b, BLKID_SUBLKS_TYPE);
  63
  64         errno = 0;
  65         r = blkid_do_safeprobe(b);
  66         if (r == 1) {
  67                 log_debug("No type detected on partition %s", node);
  68                 goto not_found;
  69         }
  70         if (r == -2) {
  71                 log_debug("Results ambiguous for partition %s", node);
  72                 return -EUCLEAN;
  73         }
  74         if (r != 0)
  75                 return -errno ?: -EIO;
  76
  77         (void) blkid_probe_lookup_value(b, "TYPE", &fstype, NULL);
  78
  79         if (fstype) {
  80                 char *t;
  81
  82                 t = strdup(fstype);
  83                 if (!t)
  84                         return -ENOMEM;
  85
  86                 *ret_fstype = t;
  87                 return 1;
  88         }
  89
  90 not_found:
  91         *ret_fstype = NULL;
  92         return 0;
  93 #else
  94         return -EOPNOTSUPP;
  95 #endif
  96 }
  97
  98 #if HAVE_BLKID
  99 /* Detect RPMB and Boot partitions, which are not listed by blkid.
 100  * See https://github.com/systemd/systemd/issues/5806. */
 101 static bool device_is_mmc_special_partition(sd_device *d) {
 102         const char *sysname;
 103
 104         if (sd_device_get_sysname(d, &sysname) < 0)
 105                 return false;
 106
 107         return startswith(sysname, "mmcblk") &&
 108                 (endswith(sysname, "rpmb") || endswith(sysname, "boot0") || endswith(sysname, "boot1"));
 109 }
 110
 111 static bool device_is_block(sd_device *d) {
 112         const char *ss;
 113
 114         if (sd_device_get_subsystem(d, &ss) < 0)
 115                 return false;
 116
 117         return streq(ss, "block");
 118 }
 119 #endif
 120
 121 int dissect_image(
 122                 int fd,
 123                 const void *root_hash,
 124                 size_t root_hash_size,
 125                 DissectImageFlags flags,
 126                 DissectedImage **ret) {
 127
 128 #if HAVE_BLKID
 129         sd_id128_t root_uuid = SD_ID128_NULL, verity_uuid = SD_ID128_NULL;
 130         _cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL;
 131         bool is_gpt, is_mbr, generic_rw, multiple_generic = false;
 132         _cleanup_(sd_device_unrefp) sd_device *d = NULL;
 133         _cleanup_(dissected_image_unrefp) DissectedImage *m = NULL;
 134         _cleanup_(blkid_free_probep) blkid_probe b = NULL;
 135         _cleanup_free_ char *generic_node = NULL;
 136         sd_id128_t generic_uuid = SD_ID128_NULL;
 137         const char *pttype = NULL;
 138         blkid_partlist pl;
 139         int r, generic_nr;
 140         struct stat st;
 141         sd_device *q;
 142         unsigned i;
 143
 144         assert(fd >= 0);
 145         assert(ret);
 146         assert(root_hash || root_hash_size == 0);
 147
 148         /* Probes a disk image, and returns information about what it found in *ret.
 149          *
 150          * Returns -ENOPKG if no suitable partition table or file system could be found.
 151          * Returns -EADDRNOTAVAIL if a root hash was specified but no matching root/verity partitions found. */
 152
 153         if (root_hash) {
 154                 /* If a root hash is supplied, then we use the root partition that has a UUID that match the first
 155                  * 128bit of the root hash. And we use the verity partition that has a UUID that match the final
 156                  * 128bit. */
 157
 158                 if (root_hash_size < sizeof(sd_id128_t))
 159                         return -EINVAL;
 160
 161                 memcpy(&root_uuid, root_hash, sizeof(sd_id128_t));
 162                 memcpy(&verity_uuid, (const uint8_t*) root_hash + root_hash_size - sizeof(sd_id128_t), sizeof(sd_id128_t));
 163
 164                 if (sd_id128_is_null(root_uuid))
 165                         return -EINVAL;
 166                 if (sd_id128_is_null(verity_uuid))
 167                         return -EINVAL;
 168         }
 169
 170         if (fstat(fd, &st) < 0)
 171                 return -errno;
 172
 173         if (!S_ISBLK(st.st_mode))
 174                 return -ENOTBLK;
 175
 176         b = blkid_new_probe();
 177         if (!b)
 178                 return -ENOMEM;
 179
 180         errno = 0;
 181         r = blkid_probe_set_device(b, fd, 0, 0);
 182         if (r != 0)
 183                 return -errno ?: -ENOMEM;
 184
 185         if ((flags & DISSECT_IMAGE_GPT_ONLY) == 0) {
 186                 /* Look for file system superblocks, unless we only shall look for GPT partition tables */
 187                 blkid_probe_enable_superblocks(b, 1);
 188                 blkid_probe_set_superblocks_flags(b, BLKID_SUBLKS_TYPE|BLKID_SUBLKS_USAGE);
 189         }
 190
 191         blkid_probe_enable_partitions(b, 1);
 192         blkid_probe_set_partitions_flags(b, BLKID_PARTS_ENTRY_DETAILS);
 193
 194         errno = 0;
 195         r = blkid_do_safeprobe(b);
 196         if (IN_SET(r, -2, 1)) {
 197                 log_debug("Failed to identify any partition table.");
 198                 return -ENOPKG;
 199         }
 200         if (r != 0)
 201                 return -errno ?: -EIO;
 202
 203         m = new0(DissectedImage, 1);
 204         if (!m)
 205                 return -ENOMEM;
 206
 207         if (!(flags & DISSECT_IMAGE_GPT_ONLY) &&
 208             (flags & DISSECT_IMAGE_REQUIRE_ROOT)) {
 209                 const char *usage = NULL;
 210
 211                 (void) blkid_probe_lookup_value(b, "USAGE", &usage, NULL);
 212                 if (STRPTR_IN_SET(usage, "filesystem", "crypto")) {
 213                         _cleanup_free_ char *t = NULL, *n = NULL;
 214                         const char *fstype = NULL;
 215
 216                         /* OK, we have found a file system, that's our root partition then. */
 217                         (void) blkid_probe_lookup_value(b, "TYPE", &fstype, NULL);
 218
 219                         if (fstype) {
 220                                 t = strdup(fstype);
 221                                 if (!t)
 222                                         return -ENOMEM;
 223                         }
 224
 225                         r = device_path_make_major_minor(st.st_mode, st.st_rdev, &n);
 226                         if (r < 0)
 227                                 return r;
 228
 229                         m->partitions[PARTITION_ROOT] = (DissectedPartition) {
 230                                 .found = true,
 231                                 .rw = true,
 232                                 .partno = -1,
 233                                 .architecture = _ARCHITECTURE_INVALID,
 234                                 .fstype = TAKE_PTR(t),
 235                                 .node = TAKE_PTR(n),
 236                         };
 237
 238                         m->encrypted = streq_ptr(fstype, "crypto_LUKS");
 239
 240                         *ret = TAKE_PTR(m);
 241
 242                         return 0;
 243                 }
 244         }
 245
 246         (void) blkid_probe_lookup_value(b, "PTTYPE", &pttype, NULL);
 247         if (!pttype)
 248                 return -ENOPKG;
 249
 250         is_gpt = streq_ptr(pttype, "gpt");
 251         is_mbr = streq_ptr(pttype, "dos");
 252
 253         if (!is_gpt && ((flags & DISSECT_IMAGE_GPT_ONLY) || !is_mbr))
 254                 return -ENOPKG;
 255
 256         errno = 0;
 257         pl = blkid_probe_get_partitions(b);
 258         if (!pl)
 259                 return -errno ?: -ENOMEM;
 260
 261         r = sd_device_new_from_devnum(&d, 'b', st.st_rdev);
 262         if (r < 0)
 263                 return r;
 264
 265         for (i = 0;; i++) {
 266                 int n, z;
 267
 268                 if (i >= 10) {
 269                         log_debug("Kernel partitions never appeared.");
 270                         return -ENXIO;
 271                 }
 272
 273                 r = sd_device_enumerator_new(&e);
 274                 if (r < 0)
 275                         return r;
 276
 277                 r = sd_device_enumerator_allow_uninitialized(e);
 278                 if (r < 0)
 279                         return r;
 280
 281                 r = sd_device_enumerator_add_match_parent(e, d);
 282                 if (r < 0)
 283                         return r;
 284
 285                 /* Count the partitions enumerated by the kernel */
 286                 n = 0;
 287                 FOREACH_DEVICE(e, q) {
 288                         if (sd_device_get_devnum(q, NULL) < 0)
 289                                 continue;
 290
 291                         if (!device_is_block(q))
 292                                 continue;
 293
 294                         if (device_is_mmc_special_partition(q))
 295                                 continue;
 296                         n++;
 297                 }
 298
 299                 /* Count the partitions enumerated by blkid */
 300                 z = blkid_partlist_numof_partitions(pl);
 301                 if (n == z + 1)
 302                         break;
 303                 if (n > z + 1) {
 304                         log_debug("blkid and kernel partition list do not match.");
 305                         return -EIO;
 306                 }
 307                 if (n < z + 1) {
 308                         unsigned j = 0;
 309
 310                         /* The kernel has probed fewer partitions than blkid? Maybe the kernel prober is still running
 311                          * or it got EBUSY because udev already opened the device. Let's reprobe the device, which is a
 312                          * synchronous call that waits until probing is complete. */
 313
 314                         for (;;) {
 315                                 if (j++ > 20)
 316                                         return -EBUSY;
 317
 318                                 if (ioctl(fd, BLKRRPART, 0) < 0) {
 319                                         r = -errno;
 320
 321                                         if (r == -EINVAL) {
 322                                                 struct loop_info64 info;
 323
 324                                                 /* If we are running on a loop device that has partition scanning off,
 325                                                  * return an explicit recognizable error about this, so that callers
 326                                                  * can generate a proper message explaining the situation. */
 327
 328                                                 if (ioctl(fd, LOOP_GET_STATUS64, &info) >= 0 && (info.lo_flags & LO_FLAGS_PARTSCAN) == 0) {
 329                                                         log_debug("Device is loop device and partition scanning is off!");
 330                                                         return -EPROTONOSUPPORT;
 331                                                 }
 332                                         }
 333                                         if (r != -EBUSY)
 334                                                 return r;
 335                                 } else
 336                                         break;
 337
 338                                 /* If something else has the device open, such as an udev rule, the ioctl will return
 339                                  * EBUSY. Since there's no way to wait until it isn't busy anymore, let's just wait a
 340                                  * bit, and try again.
 341                                  *
 342                                  * This is really something they should fix in the kernel! */
 343
 344                                 (void) usleep(50 * USEC_PER_MSEC);
 345                         }
 346                 }
 347
 348                 e = sd_device_enumerator_unref(e);
 349         }
 350
 351         FOREACH_DEVICE(e, q) {
 352                 unsigned long long pflags;
 353                 blkid_partition pp;
 354                 const char *node;
 355                 dev_t qn;
 356                 int nr;
 357
 358                 r = sd_device_get_devnum(q, &qn);
 359                 if (r < 0)
 360                         continue;
 361
 362                 if (st.st_rdev == qn)
 363                         continue;
 364
 365                 if (!device_is_block(q))
 366                         continue;
 367
 368                 if (device_is_mmc_special_partition(q))
 369                         continue;
 370
 371                 r = sd_device_get_devname(q, &node);
 372                 if (r < 0)
 373                         continue;
 374
 375                 pp = blkid_partlist_devno_to_partition(pl, qn);
 376                 if (!pp)
 377                         continue;
 378
 379                 pflags = blkid_partition_get_flags(pp);
 380
 381                 nr = blkid_partition_get_partno(pp);
 382                 if (nr < 0)
 383                         continue;
 384
 385                 if (is_gpt) {
 386                         int designator = _PARTITION_DESIGNATOR_INVALID, architecture = _ARCHITECTURE_INVALID;
 387                         const char *stype, *sid, *fstype = NULL;
 388                         sd_id128_t type_id, id;
 389                         bool rw = true;
 390
 391                         sid = blkid_partition_get_uuid(pp);
 392                         if (!sid)
 393                                 continue;
 394                         if (sd_id128_from_string(sid, &id) < 0)
 395                                 continue;
 396
 397                         stype = blkid_partition_get_type_string(pp);
 398                         if (!stype)
 399                                 continue;
 400                         if (sd_id128_from_string(stype, &type_id) < 0)
 401                                 continue;
 402
 403                         if (sd_id128_equal(type_id, GPT_HOME)) {
 404
 405                                 if (pflags & GPT_FLAG_NO_AUTO)
 406                                         continue;
 407
 408                                 designator = PARTITION_HOME;
 409                                 rw = !(pflags & GPT_FLAG_READ_ONLY);
 410                         } else if (sd_id128_equal(type_id, GPT_SRV)) {
 411
 412                                 if (pflags & GPT_FLAG_NO_AUTO)
 413                                         continue;
 414
 415                                 designator = PARTITION_SRV;
 416                                 rw = !(pflags & GPT_FLAG_READ_ONLY);
 417                         } else if (sd_id128_equal(type_id, GPT_ESP)) {
 418
 419                                 /* Note that we don't check the GPT_FLAG_NO_AUTO flag for the ESP, as it is not defined
 420                                  * there. We instead check the GPT_FLAG_NO_BLOCK_IO_PROTOCOL, as recommended by the
 421                                  * UEFI spec (See "12.3.3 Number and Location of System Partitions"). */
 422
 423                                 if (pflags & GPT_FLAG_NO_BLOCK_IO_PROTOCOL)
 424                                         continue;
 425
 426                                 designator = PARTITION_ESP;
 427                                 fstype = "vfat";
 428                         }
 429 #ifdef GPT_ROOT_NATIVE
 430                         else if (sd_id128_equal(type_id, GPT_ROOT_NATIVE)) {
 431
 432                                 if (pflags & GPT_FLAG_NO_AUTO)
 433                                         continue;
 434
 435                                 /* If a root ID is specified, ignore everything but the root id */
 436                                 if (!sd_id128_is_null(root_uuid) && !sd_id128_equal(root_uuid, id))
 437                                         continue;
 438
 439                                 designator = PARTITION_ROOT;
 440                                 architecture = native_architecture();
 441                                 rw = !(pflags & GPT_FLAG_READ_ONLY);
 442                         } else if (sd_id128_equal(type_id, GPT_ROOT_NATIVE_VERITY)) {
 443
 444                                 if (pflags & GPT_FLAG_NO_AUTO)
 445                                         continue;
 446
 447                                 m->can_verity = true;
 448
 449                                 /* Ignore verity unless a root hash is specified */
 450                                 if (sd_id128_is_null(verity_uuid) || !sd_id128_equal(verity_uuid, id))
 451                                         continue;
 452
 453                                 designator = PARTITION_ROOT_VERITY;
 454                                 fstype = "DM_verity_hash";
 455                                 architecture = native_architecture();
 456                                 rw = false;
 457                         }
 458 #endif
 459 #ifdef GPT_ROOT_SECONDARY
 460                         else if (sd_id128_equal(type_id, GPT_ROOT_SECONDARY)) {
 461
 462                                 if (pflags & GPT_FLAG_NO_AUTO)
 463                                         continue;
 464
 465                                 /* If a root ID is specified, ignore everything but the root id */
 466                                 if (!sd_id128_is_null(root_uuid) && !sd_id128_equal(root_uuid, id))
 467                                         continue;
 468
 469                                 designator = PARTITION_ROOT_SECONDARY;
 470                                 architecture = SECONDARY_ARCHITECTURE;
 471                                 rw = !(pflags & GPT_FLAG_READ_ONLY);
 472                         } else if (sd_id128_equal(type_id, GPT_ROOT_SECONDARY_VERITY)) {
 473
 474                                 if (pflags & GPT_FLAG_NO_AUTO)
 475                                         continue;
 476
 477                                 m->can_verity = true;
 478
 479                                 /* Ignore verity unless root has is specified */
 480                                 if (sd_id128_is_null(verity_uuid) || !sd_id128_equal(verity_uuid, id))
 481                                         continue;
 482
 483                                 designator = PARTITION_ROOT_SECONDARY_VERITY;
 484                                 fstype = "DM_verity_hash";
 485                                 architecture = SECONDARY_ARCHITECTURE;
 486                                 rw = false;
 487                         }
 488 #endif
 489                         else if (sd_id128_equal(type_id, GPT_SWAP)) {
 490
 491                                 if (pflags & GPT_FLAG_NO_AUTO)
 492                                         continue;
 493
 494                                 designator = PARTITION_SWAP;
 495                                 fstype = "swap";
 496                         } else if (sd_id128_equal(type_id, GPT_LINUX_GENERIC)) {
 497
 498                                 if (pflags & GPT_FLAG_NO_AUTO)
 499                                         continue;
 500
 501                                 if (generic_node)
 502                                         multiple_generic = true;
 503                                 else {
 504                                         generic_nr = nr;
 505                                         generic_rw = !(pflags & GPT_FLAG_READ_ONLY);
 506                                         generic_uuid = id;
 507                                         generic_node = strdup(node);
 508                                         if (!generic_node)
 509                                                 return -ENOMEM;
 510                                 }
 511                         }
 512
 513                         if (designator != _PARTITION_DESIGNATOR_INVALID) {
 514                                 _cleanup_free_ char *t = NULL, *n = NULL;
 515
 516                                 /* First one wins */
 517                                 if (m->partitions[designator].found)
 518                                         continue;
 519
 520                                 if (fstype) {
 521                                         t = strdup(fstype);
 522                                         if (!t)
 523                                                 return -ENOMEM;
 524                                 }
 525
 526                                 n = strdup(node);
 527                                 if (!n)
 528                                         return -ENOMEM;
 529
 530                                 m->partitions[designator] = (DissectedPartition) {
 531                                         .found = true,
 532                                         .partno = nr,
 533                                         .rw = rw,
 534                                         .architecture = architecture,
 535                                         .node = TAKE_PTR(n),
 536                                         .fstype = TAKE_PTR(t),
 537                                         .uuid = id,
 538                                 };
 539                         }
 540
 541                 } else if (is_mbr) {
 542
 543                         if (pflags != 0x80) /* Bootable flag */
 544                                 continue;
 545
 546                         if (blkid_partition_get_type(pp) != 0x83) /* Linux partition */
 547                                 continue;
 548
 549                         if (generic_node)
 550                                 multiple_generic = true;
 551                         else {
 552                                 generic_nr = nr;
 553                                 generic_rw = true;
 554                                 generic_node = strdup(node);
 555                                 if (!generic_node)
 556                                         return -ENOMEM;
 557                         }
 558                 }
 559         }
 560
 561         if (!m->partitions[PARTITION_ROOT].found) {
 562                 /* No root partition found? Then let's see if ther's one for the secondary architecture. And if not
 563                  * either, then check if there's a single generic one, and use that. */
 564
 565                 if (m->partitions[PARTITION_ROOT_VERITY].found)
 566                         return -EADDRNOTAVAIL;
 567
 568                 if (m->partitions[PARTITION_ROOT_SECONDARY].found) {
 569                         m->partitions[PARTITION_ROOT] = m->partitions[PARTITION_ROOT_SECONDARY];
 570                         zero(m->partitions[PARTITION_ROOT_SECONDARY]);
 571
 572                         m->partitions[PARTITION_ROOT_VERITY] = m->partitions[PARTITION_ROOT_SECONDARY_VERITY];
 573                         zero(m->partitions[PARTITION_ROOT_SECONDARY_VERITY]);
 574
 575                 } else if (flags & DISSECT_IMAGE_REQUIRE_ROOT) {
 576
 577                         /* If the root has was set, then we won't fallback to a generic node, because the root hash
 578                          * decides */
 579                         if (root_hash)
 580                                 return -EADDRNOTAVAIL;
 581
 582                         /* If we didn't find a generic node, then we can't fix this up either */
 583                         if (!generic_node)
 584                                 return -ENXIO;
 585
 586                         /* If we didn't find a properly marked root partition, but we did find a single suitable
 587                          * generic Linux partition, then use this as root partition, if the caller asked for it. */
 588                         if (multiple_generic)
 589                                 return -ENOTUNIQ;
 590
 591                         m->partitions[PARTITION_ROOT] = (DissectedPartition) {
 592                                 .found = true,
 593                                 .rw = generic_rw,
 594                                 .partno = generic_nr,
 595                                 .architecture = _ARCHITECTURE_INVALID,
 596                                 .node = TAKE_PTR(generic_node),
 597                                 .uuid = generic_uuid,
 598                         };
 599                 }
 600         }
 601
 602         if (root_hash) {
 603                 if (!m->partitions[PARTITION_ROOT_VERITY].found || !m->partitions[PARTITION_ROOT].found)
 604                         return -EADDRNOTAVAIL;
 605
 606                 /* If we found the primary root with the hash, then we definitely want to suppress any secondary root
 607                  * (which would be weird, after all the root hash should only be assigned to one pair of
 608                  * partitions... */
 609                 m->partitions[PARTITION_ROOT_SECONDARY].found = false;
 610                 m->partitions[PARTITION_ROOT_SECONDARY_VERITY].found = false;
 611
 612                 /* If we found a verity setup, then the root partition is necessarily read-only. */
 613                 m->partitions[PARTITION_ROOT].rw = false;
 614
 615                 m->verity = true;
 616         }
 617
 618         blkid_free_probe(b);
 619         b = NULL;
 620
 621         /* Fill in file system types if we don't know them yet. */
 622         for (i = 0; i < _PARTITION_DESIGNATOR_MAX; i++) {
 623                 DissectedPartition *p = m->partitions + i;
 624
 625                 if (!p->found)
 626                         continue;
 627
 628                 if (!p->fstype && p->node) {
 629                         r = probe_filesystem(p->node, &p->fstype);
 630                         if (r < 0 && r != -EUCLEAN)
 631                                 return r;
 632                 }
 633
 634                 if (streq_ptr(p->fstype, "crypto_LUKS"))
 635                         m->encrypted = true;
 636
 637                 if (p->fstype && fstype_is_ro(p->fstype))
 638                         p->rw = false;
 639         }
 640
 641         *ret = TAKE_PTR(m);
 642
 643         return 0;
 644 #else
 645         return -EOPNOTSUPP;
 646 #endif
 647 }
 648
 649 DissectedImage* dissected_image_unref(DissectedImage *m) {
 650         unsigned i;
 651
 652         if (!m)
 653                 return NULL;
 654
 655         for (i = 0; i < _PARTITION_DESIGNATOR_MAX; i++) {
 656                 free(m->partitions[i].fstype);
 657                 free(m->partitions[i].node);
 658                 free(m->partitions[i].decrypted_fstype);
 659                 free(m->partitions[i].decrypted_node);
 660         }
 661
 662         free(m->hostname);
 663         strv_free(m->machine_info);
 664         strv_free(m->os_release);
 665
 666         return mfree(m);
 667 }
 668
 669 static int is_loop_device(const char *path) {
 670         char s[SYS_BLOCK_PATH_MAX("/../loop/")];
 671         struct stat st;
 672
 673         assert(path);
 674
 675         if (stat(path, &st) < 0)
 676                 return -errno;
 677
 678         if (!S_ISBLK(st.st_mode))
 679                 return -ENOTBLK;
 680
 681         xsprintf_sys_block_path(s, "/loop/", st.st_dev);
 682         if (access(s, F_OK) < 0) {
 683                 if (errno != ENOENT)
 684                         return -errno;
 685
 686                 /* The device itself isn't a loop device, but maybe it's a partition and its parent is? */
 687                 xsprintf_sys_block_path(s, "/../loop/", st.st_dev);
 688                 if (access(s, F_OK) < 0)
 689                         return errno == ENOENT ? false : -errno;
 690         }
 691
 692         return true;
 693 }
 694
 695 static int mount_partition(
 696                 DissectedPartition *m,
 697                 const char *where,
 698                 const char *directory,
 699                 uid_t uid_shift,
 700                 DissectImageFlags flags) {
 701
 702         _cleanup_free_ char *chased = NULL, *options = NULL;
 703         const char *p, *node, *fstype;
 704         bool rw;
 705         int r;
 706
 707         assert(m);
 708         assert(where);
 709
 710         node = m->decrypted_node ?: m->node;
 711         fstype = m->decrypted_fstype ?: m->fstype;
 712
 713         if (!m->found || !node || !fstype)
 714                 return 0;
 715
 716         /* Stacked encryption? Yuck */
 717         if (streq_ptr(fstype, "crypto_LUKS"))
 718                 return -ELOOP;
 719
 720         rw = m->rw && !(flags & DISSECT_IMAGE_READ_ONLY);
 721
 722         if (directory) {
 723                 r = chase_symlinks(directory, where, CHASE_PREFIX_ROOT, &chased);
 724                 if (r < 0)
 725                         return r;
 726
 727                 p = chased;
 728         } else
 729                 p = where;
 730
 731         /* If requested, turn on discard support. */
 732         if (fstype_can_discard(fstype) &&
 733             ((flags & DISSECT_IMAGE_DISCARD) ||
 734              ((flags & DISSECT_IMAGE_DISCARD_ON_LOOP) && is_loop_device(m->node)))) {
 735                 options = strdup("discard");
 736                 if (!options)
 737                         return -ENOMEM;
 738         }
 739
 740         if (uid_is_valid(uid_shift) && uid_shift != 0 && fstype_can_uid_gid(fstype)) {
 741                 _cleanup_free_ char *uid_option = NULL;
 742
 743                 if (asprintf(&uid_option, "uid=" UID_FMT ",gid=" GID_FMT, uid_shift, (gid_t) uid_shift) < 0)
 744                         return -ENOMEM;
 745
 746                 if (!strextend_with_separator(&options, ",", uid_option, NULL))
 747                         return -ENOMEM;
 748         }
 749
 750         return mount_verbose(LOG_DEBUG, node, p, fstype, MS_NODEV|(rw ? 0 : MS_RDONLY), options);
 751 }
 752
 753 int dissected_image_mount(DissectedImage *m, const char *where, uid_t uid_shift, DissectImageFlags flags) {
 754         int r;
 755
 756         assert(m);
 757         assert(where);
 758
 759         if (!m->partitions[PARTITION_ROOT].found)
 760                 return -ENXIO;
 761
 762         if ((flags & DISSECT_IMAGE_MOUNT_NON_ROOT_ONLY) == 0) {
 763                 r = mount_partition(m->partitions + PARTITION_ROOT, where, NULL, uid_shift, flags);
 764                 if (r < 0)
 765                         return r;
 766
 767                 if (flags & DISSECT_IMAGE_VALIDATE_OS) {
 768                         r = path_is_os_tree(where);
 769                         if (r < 0)
 770                                 return r;
 771                         if (r == 0)
 772                                 return -EMEDIUMTYPE;
 773                 }
 774         }
 775
 776         if (flags & DISSECT_IMAGE_MOUNT_ROOT_ONLY)
 777                 return 0;
 778
 779         r = mount_partition(m->partitions + PARTITION_HOME, where, "/home", uid_shift, flags);
 780         if (r < 0)
 781                 return r;
 782
 783         r = mount_partition(m->partitions + PARTITION_SRV, where, "/srv", uid_shift, flags);
 784         if (r < 0)
 785                 return r;
 786
 787         if (m->partitions[PARTITION_ESP].found) {
 788                 const char *mp;
 789
 790                 /* Mount the ESP to /efi if it exists and is empty. If it doesn't exist, use /boot instead. */
 791
 792                 FOREACH_STRING(mp, "/efi", "/boot") {
 793                         _cleanup_free_ char *p = NULL;
 794
 795                         r = chase_symlinks(mp, where, CHASE_PREFIX_ROOT, &p);
 796                         if (r < 0)
 797                                 continue;
 798
 799                         r = dir_is_empty(p);
 800                         if (r > 0) {
 801                                 r = mount_partition(m->partitions + PARTITION_ESP, where, mp, uid_shift, flags);
 802                                 if (r < 0)
 803                                         return r;
 804                         }
 805                 }
 806         }
 807
 808         return 0;
 809 }
 810
 811 #if HAVE_LIBCRYPTSETUP
 812 typedef struct DecryptedPartition {
 813         struct crypt_device *device;
 814         char *name;
 815         bool relinquished;
 816 } DecryptedPartition;
 817
 818 struct DecryptedImage {
 819         DecryptedPartition *decrypted;
 820         size_t n_decrypted;
 821         size_t n_allocated;
 822 };
 823 #endif
 824
 825 DecryptedImage* decrypted_image_unref(DecryptedImage* d) {
 826 #if HAVE_LIBCRYPTSETUP
 827         size_t i;
 828         int r;
 829
 830         if (!d)
 831                 return NULL;
 832
 833         for (i = 0; i < d->n_decrypted; i++) {
 834                 DecryptedPartition *p = d->decrypted + i;
 835
 836                 if (p->device && p->name && !p->relinquished) {
 837                         r = crypt_deactivate(p->device, p->name);
 838                         if (r < 0)
 839                                 log_debug_errno(r, "Failed to deactivate encrypted partition %s", p->name);
 840                 }
 841
 842                 if (p->device)
 843                         crypt_free(p->device);
 844                 free(p->name);
 845         }
 846
 847         free(d);
 848 #endif
 849         return NULL;
 850 }
 851
 852 #if HAVE_LIBCRYPTSETUP
 853
 854 static int make_dm_name_and_node(const void *original_node, const char *suffix, char **ret_name, char **ret_node) {
 855         _cleanup_free_ char *name = NULL, *node = NULL;
 856         const char *base;
 857
 858         assert(original_node);
 859         assert(suffix);
 860         assert(ret_name);
 861         assert(ret_node);
 862
 863         base = strrchr(original_node, '/');
 864         if (!base)
 865                 return -EINVAL;
 866         base++;
 867         if (isempty(base))
 868                 return -EINVAL;
 869
 870         name = strjoin(base, suffix);
 871         if (!name)
 872                 return -ENOMEM;
 873         if (!filename_is_valid(name))
 874                 return -EINVAL;
 875
 876         node = strjoin(crypt_get_dir(), "/", name);
 877         if (!node)
 878                 return -ENOMEM;
 879
 880         *ret_name = TAKE_PTR(name);
 881         *ret_node = TAKE_PTR(node);
 882
 883         return 0;
 884 }
 885
 886 static int decrypt_partition(
 887                 DissectedPartition *m,
 888                 const char *passphrase,
 889                 DissectImageFlags flags,
 890                 DecryptedImage *d) {
 891
 892         _cleanup_free_ char *node = NULL, *name = NULL;
 893         _cleanup_(crypt_freep) struct crypt_device *cd = NULL;
 894         int r;
 895
 896         assert(m);
 897         assert(d);
 898
 899         if (!m->found || !m->node || !m->fstype)
 900                 return 0;
 901
 902         if (!streq(m->fstype, "crypto_LUKS"))
 903                 return 0;
 904
 905         if (!passphrase)
 906                 return -ENOKEY;
 907
 908         r = make_dm_name_and_node(m->node, "-decrypted", &name, &node);
 909         if (r < 0)
 910                 return r;
 911
 912         if (!GREEDY_REALLOC0(d->decrypted, d->n_allocated, d->n_decrypted + 1))
 913                 return -ENOMEM;
 914
 915         r = crypt_init(&cd, m->node);
 916         if (r < 0)
 917                 return log_debug_errno(r, "Failed to initialize dm-crypt: %m");
 918
 919         r = crypt_load(cd, CRYPT_LUKS, NULL);
 920         if (r < 0)
 921                 return log_debug_errno(r, "Failed to load LUKS metadata: %m");
 922
 923         r = crypt_activate_by_passphrase(cd, name, CRYPT_ANY_SLOT, passphrase, strlen(passphrase),
 924                                          ((flags & DISSECT_IMAGE_READ_ONLY) ? CRYPT_ACTIVATE_READONLY : 0) |
 925                                          ((flags & DISSECT_IMAGE_DISCARD_ON_CRYPTO) ? CRYPT_ACTIVATE_ALLOW_DISCARDS : 0));
 926         if (r < 0) {
 927                 log_debug_errno(r, "Failed to activate LUKS device: %m");
 928                 return r == -EPERM ? -EKEYREJECTED : r;
 929         }
 930
 931         d->decrypted[d->n_decrypted].name = TAKE_PTR(name);
 932         d->decrypted[d->n_decrypted].device = TAKE_PTR(cd);
 933         d->n_decrypted++;
 934
 935         m->decrypted_node = TAKE_PTR(node);
 936
 937         return 0;
 938 }
 939
 940 static int verity_partition(
 941                 DissectedPartition *m,
 942                 DissectedPartition *v,
 943                 const void *root_hash,
 944                 size_t root_hash_size,
 945                 DissectImageFlags flags,
 946                 DecryptedImage *d) {
 947
 948         _cleanup_free_ char *node = NULL, *name = NULL;
 949         _cleanup_(crypt_freep) struct crypt_device *cd = NULL;
 950         int r;
 951
 952         assert(m);
 953         assert(v);
 954
 955         if (!root_hash)
 956                 return 0;
 957
 958         if (!m->found || !m->node || !m->fstype)
 959                 return 0;
 960         if (!v->found || !v->node || !v->fstype)
 961                 return 0;
 962
 963         if (!streq(v->fstype, "DM_verity_hash"))
 964                 return 0;
 965
 966         r = make_dm_name_and_node(m->node, "-verity", &name, &node);
 967         if (r < 0)
 968                 return r;
 969
 970         if (!GREEDY_REALLOC0(d->decrypted, d->n_allocated, d->n_decrypted + 1))
 971                 return -ENOMEM;
 972
 973         r = crypt_init(&cd, v->node);
 974         if (r < 0)
 975                 return r;
 976
 977         r = crypt_load(cd, CRYPT_VERITY, NULL);
 978         if (r < 0)
 979                 return r;
 980
 981         r = crypt_set_data_device(cd, m->node);
 982         if (r < 0)
 983                 return r;
 984
 985         r = crypt_activate_by_volume_key(cd, name, root_hash, root_hash_size, CRYPT_ACTIVATE_READONLY);
 986         if (r < 0)
 987                 return r;
 988
 989         d->decrypted[d->n_decrypted].name = TAKE_PTR(name);
 990         d->decrypted[d->n_decrypted].device = TAKE_PTR(cd);
 991         d->n_decrypted++;
 992
 993         m->decrypted_node = TAKE_PTR(node);
 994
 995         return 0;
 996 }
 997 #endif
 998
 999 int dissected_image_decrypt(
1000                 DissectedImage *m,
1001                 const char *passphrase,
1002                 const void *root_hash,
1003                 size_t root_hash_size,
1004                 DissectImageFlags flags,
1005                 DecryptedImage **ret) {
1006
1007 #if HAVE_LIBCRYPTSETUP
1008         _cleanup_(decrypted_image_unrefp) DecryptedImage *d = NULL;
1009         unsigned i;
1010         int r;
1011 #endif
1012
1013         assert(m);
1014         assert(root_hash || root_hash_size == 0);
1015
1016         /* Returns:
1017          *
1018          *      = 0           → There was nothing to decrypt
1019          *      > 0           → Decrypted successfully
1020          *      -ENOKEY       → There's something to decrypt but no key was supplied
1021          *      -EKEYREJECTED → Passed key was not correct
1022          */
1023
1024         if (root_hash && root_hash_size < sizeof(sd_id128_t))
1025                 return -EINVAL;
1026
1027         if (!m->encrypted && !m->verity) {
1028                 *ret = NULL;
1029                 return 0;
1030         }
1031
1032 #if HAVE_LIBCRYPTSETUP
1033         d = new0(DecryptedImage, 1);
1034         if (!d)
1035                 return -ENOMEM;
1036
1037         for (i = 0; i < _PARTITION_DESIGNATOR_MAX; i++) {
1038                 DissectedPartition *p = m->partitions + i;
1039                 int k;
1040
1041                 if (!p->found)
1042                         continue;
1043
1044                 r = decrypt_partition(p, passphrase, flags, d);
1045                 if (r < 0)
1046                         return r;
1047
1048                 k = PARTITION_VERITY_OF(i);
1049                 if (k >= 0) {
1050                         r = verity_partition(p, m->partitions + k, root_hash, root_hash_size, flags, d);
1051                         if (r < 0)
1052                                 return r;
1053                 }
1054
1055                 if (!p->decrypted_fstype && p->decrypted_node) {
1056                         r = probe_filesystem(p->decrypted_node, &p->decrypted_fstype);
1057                         if (r < 0 && r != -EUCLEAN)
1058                                 return r;
1059                 }
1060         }
1061
1062         *ret = TAKE_PTR(d);
1063
1064         return 1;
1065 #else
1066         return -EOPNOTSUPP;
1067 #endif
1068 }
1069
1070 int dissected_image_decrypt_interactively(
1071                 DissectedImage *m,
1072                 const char *passphrase,
1073                 const void *root_hash,
1074                 size_t root_hash_size,
1075                 DissectImageFlags flags,
1076                 DecryptedImage **ret) {
1077
1078         _cleanup_strv_free_erase_ char **z = NULL;
1079         int n = 3, r;
1080
1081         if (passphrase)
1082                 n--;
1083
1084         for (;;) {
1085                 r = dissected_image_decrypt(m, passphrase, root_hash, root_hash_size, flags, ret);
1086                 if (r >= 0)
1087                         return r;
1088                 if (r == -EKEYREJECTED)
1089                         log_error_errno(r, "Incorrect passphrase, try again!");
1090                 else if (r != -ENOKEY)
1091                         return log_error_errno(r, "Failed to decrypt image: %m");
1092
1093                 if (--n < 0)
1094                         return log_error_errno(SYNTHETIC_ERRNO(EKEYREJECTED),
1095                                                "Too many retries.");
1096
1097                 z = strv_free(z);
1098
1099                 r = ask_password_auto("Please enter image passphrase:", NULL, "dissect", "dissect", USEC_INFINITY, 0, &z);
1100                 if (r < 0)
1101                         return log_error_errno(r, "Failed to query for passphrase: %m");
1102
1103                 passphrase = z[0];
1104         }
1105 }
1106
1107 #if HAVE_LIBCRYPTSETUP
1108 static int deferred_remove(DecryptedPartition *p) {
1109
1110         struct dm_ioctl dm = {
1111                 .version = {
1112                         DM_VERSION_MAJOR,
1113                         DM_VERSION_MINOR,
1114                         DM_VERSION_PATCHLEVEL
1115                 },
1116                 .data_size = sizeof(dm),
1117                 .flags = DM_DEFERRED_REMOVE,
1118         };
1119
1120         _cleanup_close_ int fd = -1;
1121
1122         assert(p);
1123
1124         /* Unfortunately, libcryptsetup doesn't provide a proper API for this, hence call the ioctl() directly. */
1125
1126         fd = open("/dev/mapper/control", O_RDWR|O_CLOEXEC);
1127         if (fd < 0)
1128                 return -errno;
1129
1130         strncpy(dm.name, p->name, sizeof(dm.name));
1131
1132         if (ioctl(fd, DM_DEV_REMOVE, &dm))
1133                 return -errno;
1134
1135         return 0;
1136 }
1137 #endif
1138
1139 int decrypted_image_relinquish(DecryptedImage *d) {
1140
1141 #if HAVE_LIBCRYPTSETUP
1142         size_t i;
1143         int r;
1144 #endif
1145
1146         assert(d);
1147
1148         /* Turns on automatic removal after the last use ended for all DM devices of this image, and sets a boolean so
1149          * that we don't clean it up ourselves either anymore */
1150
1151 #if HAVE_LIBCRYPTSETUP
1152         for (i = 0; i < d->n_decrypted; i++) {
1153                 DecryptedPartition *p = d->decrypted + i;
1154
1155                 if (p->relinquished)
1156                         continue;
1157
1158                 r = deferred_remove(p);
1159                 if (r < 0)
1160                         return log_debug_errno(r, "Failed to mark %s for auto-removal: %m", p->name);
1161
1162                 p->relinquished = true;
1163         }
1164 #endif
1165
1166         return 0;
1167 }
1168
1169 int root_hash_load(const char *image, void **ret, size_t *ret_size) {
1170         _cleanup_free_ char *text = NULL;
1171         _cleanup_free_ void *k = NULL;
1172         size_t l;
1173         int r;
1174
1175         assert(image);
1176         assert(ret);
1177         assert(ret_size);
1178
1179         if (is_device_path(image)) {
1180                 /* If we are asked to load the root hash for a device node, exit early */
1181                 *ret = NULL;
1182                 *ret_size = 0;
1183                 return 0;
1184         }
1185
1186         r = getxattr_malloc(image, "user.verity.roothash", &text, true);
1187         if (r < 0) {
1188                 char *fn, *e, *n;
1189
1190                 if (!IN_SET(r, -ENODATA, -EOPNOTSUPP, -ENOENT))
1191                         return r;
1192
1193                 fn = newa(char, strlen(image) + STRLEN(".roothash") + 1);
1194                 n = stpcpy(fn, image);
1195                 e = endswith(fn, ".raw");
1196                 if (e)
1197                         n = e;
1198
1199                 strcpy(n, ".roothash");
1200
1201                 r = read_one_line_file(fn, &text);
1202                 if (r == -ENOENT) {
1203                         *ret = NULL;
1204                         *ret_size = 0;
1205                         return 0;
1206                 }
1207                 if (r < 0)
1208                         return r;
1209         }
1210
1211         r = unhexmem(text, strlen(text), &k, &l);
1212         if (r < 0)
1213                 return r;
1214         if (l < sizeof(sd_id128_t))
1215                 return -EINVAL;
1216
1217         *ret = TAKE_PTR(k);
1218         *ret_size = l;
1219
1220         return 1;
1221 }
1222
1223 int dissected_image_acquire_metadata(DissectedImage *m) {
1224
1225         enum {
1226                 META_HOSTNAME,
1227                 META_MACHINE_ID,
1228                 META_MACHINE_INFO,
1229                 META_OS_RELEASE,
1230                 _META_MAX,
1231         };
1232
1233         static const char *const paths[_META_MAX] = {
1234                 [META_HOSTNAME]     = "/etc/hostname\0",
1235                 [META_MACHINE_ID]   = "/etc/machine-id\0",
1236                 [META_MACHINE_INFO] = "/etc/machine-info\0",
1237                 [META_OS_RELEASE]   = "/etc/os-release\0/usr/lib/os-release\0",
1238         };
1239
1240         _cleanup_strv_free_ char **machine_info = NULL, **os_release = NULL;
1241         _cleanup_(rmdir_and_freep) char *t = NULL;
1242         _cleanup_(sigkill_waitp) pid_t child = 0;
1243         sd_id128_t machine_id = SD_ID128_NULL;
1244         _cleanup_free_ char *hostname = NULL;
1245         unsigned n_meta_initialized = 0, k;
1246         int fds[2 * _META_MAX], r;
1247
1248         BLOCK_SIGNALS(SIGCHLD);
1249
1250         assert(m);
1251
1252         for (; n_meta_initialized < _META_MAX; n_meta_initialized ++)
1253                 if (pipe2(fds + 2*n_meta_initialized, O_CLOEXEC) < 0) {
1254                         r = -errno;
1255                         goto finish;
1256                 }
1257
1258         r = mkdtemp_malloc("/tmp/dissect-XXXXXX", &t);
1259         if (r < 0)
1260                 goto finish;
1261
1262         r = safe_fork("(sd-dissect)", FORK_RESET_SIGNALS|FORK_DEATHSIG|FORK_NEW_MOUNTNS|FORK_MOUNTNS_SLAVE, &child);
1263         if (r < 0)
1264                 goto finish;
1265         if (r == 0) {
1266                 r = dissected_image_mount(m, t, UID_INVALID, DISSECT_IMAGE_READ_ONLY|DISSECT_IMAGE_MOUNT_ROOT_ONLY|DISSECT_IMAGE_VALIDATE_OS);
1267                 if (r < 0) {
1268                         log_debug_errno(r, "Failed to mount dissected image: %m");
1269                         _exit(EXIT_FAILURE);
1270                 }
1271
1272                 for (k = 0; k < _META_MAX; k++) {
1273                         _cleanup_close_ int fd = -1;
1274                         const char *p;
1275
1276                         fds[2*k] = safe_close(fds[2*k]);
1277
1278                         NULSTR_FOREACH(p, paths[k]) {
1279                                 fd = chase_symlinks_and_open(p, t, CHASE_PREFIX_ROOT, O_RDONLY|O_CLOEXEC|O_NOCTTY, NULL);
1280                                 if (fd >= 0)
1281                                         break;
1282                         }
1283                         if (fd < 0) {
1284                                 log_debug_errno(fd, "Failed to read %s file of image, ignoring: %m", paths[k]);
1285                                 continue;
1286                         }
1287
1288                         r = copy_bytes(fd, fds[2*k+1], (uint64_t) -1, 0);
1289                         if (r < 0)
1290                                 _exit(EXIT_FAILURE);
1291
1292                         fds[2*k+1] = safe_close(fds[2*k+1]);
1293                 }
1294
1295                 _exit(EXIT_SUCCESS);
1296         }
1297
1298         for (k = 0; k < _META_MAX; k++) {
1299                 _cleanup_fclose_ FILE *f = NULL;
1300
1301                 fds[2*k+1] = safe_close(fds[2*k+1]);
1302
1303                 f = fdopen(fds[2*k], "re");
1304                 if (!f) {
1305                         r = -errno;
1306                         goto finish;
1307                 }
1308
1309                 fds[2*k] = -1;
1310
1311                 switch (k) {
1312
1313                 case META_HOSTNAME:
1314                         r = read_etc_hostname_stream(f, &hostname);
1315                         if (r < 0)
1316                                 log_debug_errno(r, "Failed to read /etc/hostname: %m");
1317
1318                         break;
1319
1320                 case META_MACHINE_ID: {
1321                         _cleanup_free_ char *line = NULL;
1322
1323                         r = read_line(f, LONG_LINE_MAX, &line);
1324                         if (r < 0)
1325                                 log_debug_errno(r, "Failed to read /etc/machine-id: %m");
1326                         else if (r == 33) {
1327                                 r = sd_id128_from_string(line, &machine_id);
1328                                 if (r < 0)
1329                                         log_debug_errno(r, "Image contains invalid /etc/machine-id: %s", line);
1330                         } else if (r == 0)
1331                                 log_debug("/etc/machine-id file is empty.");
1332                         else
1333                                 log_debug("/etc/machine-id has unexpected length %i.", r);
1334
1335                         break;
1336                 }
1337
1338                 case META_MACHINE_INFO:
1339                         r = load_env_file_pairs(f, "machine-info", &machine_info);
1340                         if (r < 0)
1341                                 log_debug_errno(r, "Failed to read /etc/machine-info: %m");
1342
1343                         break;
1344
1345                 case META_OS_RELEASE:
1346                         r = load_env_file_pairs(f, "os-release", &os_release);
1347                         if (r < 0)
1348                                 log_debug_errno(r, "Failed to read OS release file: %m");
1349
1350                         break;
1351                 }
1352         }
1353
1354         r = wait_for_terminate_and_check("(sd-dissect)", child, 0);
1355         child = 0;
1356         if (r < 0)
1357                 goto finish;
1358         if (r != EXIT_SUCCESS)
1359                 return -EPROTO;
1360
1361         free_and_replace(m->hostname, hostname);
1362         m->machine_id = machine_id;
1363         strv_free_and_replace(m->machine_info, machine_info);
1364         strv_free_and_replace(m->os_release, os_release);
1365
1366 finish:
1367         for (k = 0; k < n_meta_initialized; k++)
1368                 safe_close_pair(fds + 2*k);
1369
1370         return r;
1371 }
1372
1373 int dissect_image_and_warn(
1374                 int fd,
1375                 const char *name,
1376                 const void *root_hash,
1377                 size_t root_hash_size,
1378                 DissectImageFlags flags,
1379                 DissectedImage **ret) {
1380
1381         _cleanup_free_ char *buffer = NULL;
1382         int r;
1383
1384         if (!name) {
1385                 r = fd_get_path(fd, &buffer);
1386                 if (r < 0)
1387                         return r;
1388
1389                 name = buffer;
1390         }
1391
1392         r = dissect_image(fd, root_hash, root_hash_size, flags, ret);
1393
1394         switch (r) {
1395
1396         case -EOPNOTSUPP:
1397                 return log_error_errno(r, "Dissecting images is not supported, compiled without blkid support.");
1398
1399         case -ENOPKG:
1400                 return log_error_errno(r, "Couldn't identify a suitable partition table or file system in '%s'.", name);
1401
1402         case -EADDRNOTAVAIL:
1403                 return log_error_errno(r, "No root partition for specified root hash found in '%s'.", name);
1404
1405         case -ENOTUNIQ:
1406                 return log_error_errno(r, "Multiple suitable root partitions found in image '%s'.", name);
1407
1408         case -ENXIO:
1409                 return log_error_errno(r, "No suitable root partition found in image '%s'.", name);
1410
1411         case -EPROTONOSUPPORT:
1412                 return log_error_errno(r, "Device '%s' is loopback block device with partition scanning turned off, please turn it on.", name);
1413
1414         default:
1415                 if (r < 0)
1416                         return log_error_errno(r, "Failed to dissect image '%s': %m", name);
1417
1418                 return r;
1419         }
1420 }
1421
1422 static const char *const partition_designator_table[] = {
1423         [PARTITION_ROOT] = "root",
1424         [PARTITION_ROOT_SECONDARY] = "root-secondary",
1425         [PARTITION_HOME] = "home",
1426         [PARTITION_SRV] = "srv",
1427         [PARTITION_ESP] = "esp",
1428         [PARTITION_SWAP] = "swap",
1429         [PARTITION_ROOT_VERITY] = "root-verity",
1430         [PARTITION_ROOT_SECONDARY_VERITY] = "root-secondary-verity",
1431 };
1432
1433 DEFINE_STRING_TABLE_LOOKUP(partition_designator, int);