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-id128.h"
   8
   9 #include "architecture.h"
  10 #include "ask-password-api.h"
  11 #include "blkid-util.h"
  12 #include "blockdev-util.h"
  13 #include "copy.h"
  14 #include "crypt-util.h"
  15 #include "def.h"
  16 #include "device-nodes.h"
  17 #include "dissect-image.h"
  18 #include "fd-util.h"
  19 #include "fileio.h"
  20 #include "fs-util.h"
  21 #include "gpt.h"
  22 #include "hexdecoct.h"
  23 #include "hostname-util.h"
  24 #include "id128-util.h"
  25 #include "linux-3.13/dm-ioctl.h"
  26 #include "missing.h"
  27 #include "mount-util.h"
  28 #include "os-util.h"
  29 #include "path-util.h"
  30 #include "process-util.h"
  31 #include "raw-clone.h"
  32 #include "signal-util.h"
  33 #include "stat-util.h"
  34 #include "stdio-util.h"
  35 #include "string-table.h"
  36 #include "string-util.h"
  37 #include "strv.h"
  38 #include "udev-util.h"
  39 #include "user-util.h"
  40 #include "xattr-util.h"
  41
  42 int probe_filesystem(const char *node, char **ret_fstype) {
  43         /* Try to find device content type and return it in *ret_fstype. If nothing is found,
  44          * 0/NULL will be returned. -EUCLEAN will be returned for ambigous results, and an
  45          * different error otherwise. */
  46
  47 #if HAVE_BLKID
  48         _cleanup_(blkid_free_probep) blkid_probe b = NULL;
  49         const char *fstype;
  50         int r;
  51
  52         errno = 0;
  53         b = blkid_new_probe_from_filename(node);
  54         if (!b)
  55                 return -errno ?: -ENOMEM;
  56
  57         blkid_probe_enable_superblocks(b, 1);
  58         blkid_probe_set_superblocks_flags(b, BLKID_SUBLKS_TYPE);
  59
  60         errno = 0;
  61         r = blkid_do_safeprobe(b);
  62         if (r == 1) {
  63                 log_debug("No type detected on partition %s", node);
  64                 goto not_found;
  65         }
  66         if (r == -2) {
  67                 log_debug("Results ambiguous for partition %s", node);
  68                 return -EUCLEAN;
  69         }
  70         if (r != 0)
  71                 return -errno ?: -EIO;
  72
  73         (void) blkid_probe_lookup_value(b, "TYPE", &fstype, NULL);
  74
  75         if (fstype) {
  76                 char *t;
  77
  78                 t = strdup(fstype);
  79                 if (!t)
  80                         return -ENOMEM;
  81
  82                 *ret_fstype = t;
  83                 return 1;
  84         }
  85
  86 not_found:
  87         *ret_fstype = NULL;
  88         return 0;
  89 #else
  90         return -EOPNOTSUPP;
  91 #endif
  92 }
  93
  94 #if HAVE_BLKID
  95 /* Detect RPMB and Boot partitions, which are not listed by blkid.
  96  * See https://github.com/systemd/systemd/issues/5806. */
  97 static bool device_is_mmc_special_partition(struct udev_device *d) {
  98         const char *sysname;
  99
 100         sysname = udev_device_get_sysname(d);
 101         return sysname && startswith(sysname, "mmcblk") &&
 102                 (endswith(sysname, "rpmb") || endswith(sysname, "boot0") || endswith(sysname, "boot1"));
 103 }
 104
 105 static bool device_is_block(struct udev_device *d) {
 106         const char *ss;
 107
 108         ss = udev_device_get_subsystem(d);
 109         if (!ss)
 110                 return false;
 111
 112         return streq(ss, "block");
 113 }
 114 #endif
 115
 116 int dissect_image(
 117                 int fd,
 118                 const void *root_hash,
 119                 size_t root_hash_size,
 120                 DissectImageFlags flags,
 121                 DissectedImage **ret) {
 122
 123 #if HAVE_BLKID
 124         sd_id128_t root_uuid = SD_ID128_NULL, verity_uuid = SD_ID128_NULL;
 125         _cleanup_(udev_enumerate_unrefp) struct udev_enumerate *e = NULL;
 126         bool is_gpt, is_mbr, generic_rw, multiple_generic = false;
 127         _cleanup_(udev_device_unrefp) struct udev_device *d = NULL;
 128         _cleanup_(dissected_image_unrefp) DissectedImage *m = NULL;
 129         _cleanup_(blkid_free_probep) blkid_probe b = NULL;
 130         _cleanup_(udev_unrefp) struct udev *udev = NULL;
 131         _cleanup_free_ char *generic_node = NULL;
 132         sd_id128_t generic_uuid = SD_ID128_NULL;
 133         const char *pttype = NULL;
 134         struct udev_list_entry *first, *item;
 135         blkid_partlist pl;
 136         int r, generic_nr;
 137         struct stat st;
 138         unsigned i;
 139
 140         assert(fd >= 0);
 141         assert(ret);
 142         assert(root_hash || root_hash_size == 0);
 143
 144         /* Probes a disk image, and returns information about what it found in *ret.
 145          *
 146          * Returns -ENOPKG if no suitable partition table or file system could be found.
 147          * Returns -EADDRNOTAVAIL if a root hash was specified but no matching root/verity partitions found. */
 148
 149         if (root_hash) {
 150                 /* If a root hash is supplied, then we use the root partition that has a UUID that match the first
 151                  * 128bit of the root hash. And we use the verity partition that has a UUID that match the final
 152                  * 128bit. */
 153
 154                 if (root_hash_size < sizeof(sd_id128_t))
 155                         return -EINVAL;
 156
 157                 memcpy(&root_uuid, root_hash, sizeof(sd_id128_t));
 158                 memcpy(&verity_uuid, (const uint8_t*) root_hash + root_hash_size - sizeof(sd_id128_t), sizeof(sd_id128_t));
 159
 160                 if (sd_id128_is_null(root_uuid))
 161                         return -EINVAL;
 162                 if (sd_id128_is_null(verity_uuid))
 163                         return -EINVAL;
 164         }
 165
 166         if (fstat(fd, &st) < 0)
 167                 return -errno;
 168
 169         if (!S_ISBLK(st.st_mode))
 170                 return -ENOTBLK;
 171
 172         b = blkid_new_probe();
 173         if (!b)
 174                 return -ENOMEM;
 175
 176         errno = 0;
 177         r = blkid_probe_set_device(b, fd, 0, 0);
 178         if (r != 0)
 179                 return -errno ?: -ENOMEM;
 180
 181         if ((flags & DISSECT_IMAGE_GPT_ONLY) == 0) {
 182                 /* Look for file system superblocks, unless we only shall look for GPT partition tables */
 183                 blkid_probe_enable_superblocks(b, 1);
 184                 blkid_probe_set_superblocks_flags(b, BLKID_SUBLKS_TYPE|BLKID_SUBLKS_USAGE);
 185         }
 186
 187         blkid_probe_enable_partitions(b, 1);
 188         blkid_probe_set_partitions_flags(b, BLKID_PARTS_ENTRY_DETAILS);
 189
 190         errno = 0;
 191         r = blkid_do_safeprobe(b);
 192         if (IN_SET(r, -2, 1)) {
 193                 log_debug("Failed to identify any partition table.");
 194                 return -ENOPKG;
 195         }
 196         if (r != 0)
 197                 return -errno ?: -EIO;
 198
 199         m = new0(DissectedImage, 1);
 200         if (!m)
 201                 return -ENOMEM;
 202
 203         if (!(flags & DISSECT_IMAGE_GPT_ONLY) &&
 204             (flags & DISSECT_IMAGE_REQUIRE_ROOT)) {
 205                 const char *usage = NULL;
 206
 207                 (void) blkid_probe_lookup_value(b, "USAGE", &usage, NULL);
 208                 if (STRPTR_IN_SET(usage, "filesystem", "crypto")) {
 209                         _cleanup_free_ char *t = NULL, *n = NULL;
 210                         const char *fstype = NULL;
 211
 212                         /* OK, we have found a file system, that's our root partition then. */
 213                         (void) blkid_probe_lookup_value(b, "TYPE", &fstype, NULL);
 214
 215                         if (fstype) {
 216                                 t = strdup(fstype);
 217                                 if (!t)
 218                                         return -ENOMEM;
 219                         }
 220
 221                         if (asprintf(&n, "/dev/block/%u:%u", major(st.st_rdev), minor(st.st_rdev)) < 0)
 222                                 return -ENOMEM;
 223
 224                         m->partitions[PARTITION_ROOT] = (DissectedPartition) {
 225                                 .found = true,
 226                                 .rw = true,
 227                                 .partno = -1,
 228                                 .architecture = _ARCHITECTURE_INVALID,
 229                                 .fstype = TAKE_PTR(t),
 230                                 .node = TAKE_PTR(n),
 231                         };
 232
 233                         m->encrypted = streq(fstype, "crypto_LUKS");
 234
 235                         *ret = TAKE_PTR(m);
 236
 237                         return 0;
 238                 }
 239         }
 240
 241         (void) blkid_probe_lookup_value(b, "PTTYPE", &pttype, NULL);
 242         if (!pttype)
 243                 return -ENOPKG;
 244
 245         is_gpt = streq_ptr(pttype, "gpt");
 246         is_mbr = streq_ptr(pttype, "dos");
 247
 248         if (!is_gpt && ((flags & DISSECT_IMAGE_GPT_ONLY) || !is_mbr))
 249                 return -ENOPKG;
 250
 251         errno = 0;
 252         pl = blkid_probe_get_partitions(b);
 253         if (!pl)
 254                 return -errno ?: -ENOMEM;
 255
 256         udev = udev_new();
 257         if (!udev)
 258                 return -errno;
 259
 260         d = udev_device_new_from_devnum(udev, 'b', st.st_rdev);
 261         if (!d)
 262                 return -ENOMEM;
 263
 264         for (i = 0;; i++) {
 265                 int n, z;
 266
 267                 if (i >= 10) {
 268                         log_debug("Kernel partitions never appeared.");
 269                         return -ENXIO;
 270                 }
 271
 272                 e = udev_enumerate_new(udev);
 273                 if (!e)
 274                         return -errno;
 275
 276                 r = udev_enumerate_add_match_parent(e, d);
 277                 if (r < 0)
 278                         return r;
 279
 280                 r = udev_enumerate_scan_devices(e);
 281                 if (r < 0)
 282                         return r;
 283
 284                 /* Count the partitions enumerated by the kernel */
 285                 n = 0;
 286                 first = udev_enumerate_get_list_entry(e);
 287                 udev_list_entry_foreach(item, first) {
 288                         _cleanup_(udev_device_unrefp) struct udev_device *q;
 289                         dev_t qn;
 290
 291                         q = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item));
 292                         if (!q)
 293                                 return -errno;
 294
 295                         qn = udev_device_get_devnum(q);
 296                         if (major(qn) == 0)
 297                                 continue;
 298
 299                         if (!device_is_block(q))
 300                                 continue;
 301
 302                         if (device_is_mmc_special_partition(q))
 303                                 continue;
 304                         n++;
 305                 }
 306
 307                 /* Count the partitions enumerated by blkid */
 308                 z = blkid_partlist_numof_partitions(pl);
 309                 if (n == z + 1)
 310                         break;
 311                 if (n > z + 1) {
 312                         log_debug("blkid and kernel partition list do not match.");
 313                         return -EIO;
 314                 }
 315                 if (n < z + 1) {
 316                         unsigned j = 0;
 317
 318                         /* The kernel has probed fewer partitions than blkid? Maybe the kernel prober is still running
 319                          * or it got EBUSY because udev already opened the device. Let's reprobe the device, which is a
 320                          * synchronous call that waits until probing is complete. */
 321
 322                         for (;;) {
 323                                 if (j++ > 20)
 324                                         return -EBUSY;
 325
 326                                 if (ioctl(fd, BLKRRPART, 0) < 0) {
 327                                         r = -errno;
 328
 329                                         if (r == -EINVAL) {
 330                                                 struct loop_info64 info;
 331
 332                                                 /* If we are running on a loop device that has partition scanning off,
 333                                                  * return an explicit recognizable error about this, so that callers
 334                                                  * can generate a proper message explaining the situation. */
 335
 336                                                 if (ioctl(fd, LOOP_GET_STATUS64, &info) >= 0 && (info.lo_flags & LO_FLAGS_PARTSCAN) == 0) {
 337                                                         log_debug("Device is loop device and partition scanning is off!");
 338                                                         return -EPROTONOSUPPORT;
 339                                                 }
 340                                         }
 341                                         if (r != -EBUSY)
 342                                                 return r;
 343                                 } else
 344                                         break;
 345
 346                                 /* If something else has the device open, such as an udev rule, the ioctl will return
 347                                  * EBUSY. Since there's no way to wait until it isn't busy anymore, let's just wait a
 348                                  * bit, and try again.
 349                                  *
 350                                  * This is really something they should fix in the kernel! */
 351
 352                                 (void) usleep(50 * USEC_PER_MSEC);
 353                         }
 354                 }
 355
 356                 e = udev_enumerate_unref(e);
 357         }
 358
 359         first = udev_enumerate_get_list_entry(e);
 360         udev_list_entry_foreach(item, first) {
 361                 _cleanup_(udev_device_unrefp) struct udev_device *q;
 362                 unsigned long long pflags;
 363                 blkid_partition pp;
 364                 const char *node;
 365                 dev_t qn;
 366                 int nr;
 367
 368                 q = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item));
 369                 if (!q)
 370                         return -errno;
 371
 372                 qn = udev_device_get_devnum(q);
 373                 if (major(qn) == 0)
 374                         continue;
 375
 376                 if (st.st_rdev == qn)
 377                         continue;
 378
 379                 if (!device_is_block(q))
 380                         continue;
 381
 382                 if (device_is_mmc_special_partition(q))
 383                         continue;
 384
 385                 node = udev_device_get_devnode(q);
 386                 if (!node)
 387                         continue;
 388
 389                 pp = blkid_partlist_devno_to_partition(pl, qn);
 390                 if (!pp)
 391                         continue;
 392
 393                 pflags = blkid_partition_get_flags(pp);
 394
 395                 nr = blkid_partition_get_partno(pp);
 396                 if (nr < 0)
 397                         continue;
 398
 399                 if (is_gpt) {
 400                         int designator = _PARTITION_DESIGNATOR_INVALID, architecture = _ARCHITECTURE_INVALID;
 401                         const char *stype, *sid, *fstype = NULL;
 402                         sd_id128_t type_id, id;
 403                         bool rw = true;
 404
 405                         sid = blkid_partition_get_uuid(pp);
 406                         if (!sid)
 407                                 continue;
 408                         if (sd_id128_from_string(sid, &id) < 0)
 409                                 continue;
 410
 411                         stype = blkid_partition_get_type_string(pp);
 412                         if (!stype)
 413                                 continue;
 414                         if (sd_id128_from_string(stype, &type_id) < 0)
 415                                 continue;
 416
 417                         if (sd_id128_equal(type_id, GPT_HOME)) {
 418
 419                                 if (pflags & GPT_FLAG_NO_AUTO)
 420                                         continue;
 421
 422                                 designator = PARTITION_HOME;
 423                                 rw = !(pflags & GPT_FLAG_READ_ONLY);
 424                         } else if (sd_id128_equal(type_id, GPT_SRV)) {
 425
 426                                 if (pflags & GPT_FLAG_NO_AUTO)
 427                                         continue;
 428
 429                                 designator = PARTITION_SRV;
 430                                 rw = !(pflags & GPT_FLAG_READ_ONLY);
 431                         } else if (sd_id128_equal(type_id, GPT_ESP)) {
 432
 433                                 /* Note that we don't check the GPT_FLAG_NO_AUTO flag for the ESP, as it is not defined
 434                                  * there. We instead check the GPT_FLAG_NO_BLOCK_IO_PROTOCOL, as recommended by the
 435                                  * UEFI spec (See "12.3.3 Number and Location of System Partitions"). */
 436
 437                                 if (pflags & GPT_FLAG_NO_BLOCK_IO_PROTOCOL)
 438                                         continue;
 439
 440                                 designator = PARTITION_ESP;
 441                                 fstype = "vfat";
 442                         }
 443 #ifdef GPT_ROOT_NATIVE
 444                         else if (sd_id128_equal(type_id, GPT_ROOT_NATIVE)) {
 445
 446                                 if (pflags & GPT_FLAG_NO_AUTO)
 447                                         continue;
 448
 449                                 /* If a root ID is specified, ignore everything but the root id */
 450                                 if (!sd_id128_is_null(root_uuid) && !sd_id128_equal(root_uuid, id))
 451                                         continue;
 452
 453                                 designator = PARTITION_ROOT;
 454                                 architecture = native_architecture();
 455                                 rw = !(pflags & GPT_FLAG_READ_ONLY);
 456                         } else if (sd_id128_equal(type_id, GPT_ROOT_NATIVE_VERITY)) {
 457
 458                                 if (pflags & GPT_FLAG_NO_AUTO)
 459                                         continue;
 460
 461                                 m->can_verity = true;
 462
 463                                 /* Ignore verity unless a root hash is specified */
 464                                 if (sd_id128_is_null(verity_uuid) || !sd_id128_equal(verity_uuid, id))
 465                                         continue;
 466
 467                                 designator = PARTITION_ROOT_VERITY;
 468                                 fstype = "DM_verity_hash";
 469                                 architecture = native_architecture();
 470                                 rw = false;
 471                         }
 472 #endif
 473 #ifdef GPT_ROOT_SECONDARY
 474                         else if (sd_id128_equal(type_id, GPT_ROOT_SECONDARY)) {
 475
 476                                 if (pflags & GPT_FLAG_NO_AUTO)
 477                                         continue;
 478
 479                                 /* If a root ID is specified, ignore everything but the root id */
 480                                 if (!sd_id128_is_null(root_uuid) && !sd_id128_equal(root_uuid, id))
 481                                         continue;
 482
 483                                 designator = PARTITION_ROOT_SECONDARY;
 484                                 architecture = SECONDARY_ARCHITECTURE;
 485                                 rw = !(pflags & GPT_FLAG_READ_ONLY);
 486                         } else if (sd_id128_equal(type_id, GPT_ROOT_SECONDARY_VERITY)) {
 487
 488                                 if (pflags & GPT_FLAG_NO_AUTO)
 489                                         continue;
 490
 491                                 m->can_verity = true;
 492
 493                                 /* Ignore verity unless root has is specified */
 494                                 if (sd_id128_is_null(verity_uuid) || !sd_id128_equal(verity_uuid, id))
 495                                         continue;
 496
 497                                 designator = PARTITION_ROOT_SECONDARY_VERITY;
 498                                 fstype = "DM_verity_hash";
 499                                 architecture = SECONDARY_ARCHITECTURE;
 500                                 rw = false;
 501                         }
 502 #endif
 503                         else if (sd_id128_equal(type_id, GPT_SWAP)) {
 504
 505                                 if (pflags & GPT_FLAG_NO_AUTO)
 506                                         continue;
 507
 508                                 designator = PARTITION_SWAP;
 509                                 fstype = "swap";
 510                         } else if (sd_id128_equal(type_id, GPT_LINUX_GENERIC)) {
 511
 512                                 if (pflags & GPT_FLAG_NO_AUTO)
 513                                         continue;
 514
 515                                 if (generic_node)
 516                                         multiple_generic = true;
 517                                 else {
 518                                         generic_nr = nr;
 519                                         generic_rw = !(pflags & GPT_FLAG_READ_ONLY);
 520                                         generic_uuid = id;
 521                                         generic_node = strdup(node);
 522                                         if (!generic_node)
 523                                                 return -ENOMEM;
 524                                 }
 525                         }
 526
 527                         if (designator != _PARTITION_DESIGNATOR_INVALID) {
 528                                 _cleanup_free_ char *t = NULL, *n = NULL;
 529
 530                                 /* First one wins */
 531                                 if (m->partitions[designator].found)
 532                                         continue;
 533
 534                                 if (fstype) {
 535                                         t = strdup(fstype);
 536                                         if (!t)
 537                                                 return -ENOMEM;
 538                                 }
 539
 540                                 n = strdup(node);
 541                                 if (!n)
 542                                         return -ENOMEM;
 543
 544                                 m->partitions[designator] = (DissectedPartition) {
 545                                         .found = true,
 546                                         .partno = nr,
 547                                         .rw = rw,
 548                                         .architecture = architecture,
 549                                         .node = TAKE_PTR(n),
 550                                         .fstype = TAKE_PTR(t),
 551                                         .uuid = id,
 552                                 };
 553                         }
 554
 555                 } else if (is_mbr) {
 556
 557                         if (pflags != 0x80) /* Bootable flag */
 558                                 continue;
 559
 560                         if (blkid_partition_get_type(pp) != 0x83) /* Linux partition */
 561                                 continue;
 562
 563                         if (generic_node)
 564                                 multiple_generic = true;
 565                         else {
 566                                 generic_nr = nr;
 567                                 generic_rw = true;
 568                                 generic_node = strdup(node);
 569                                 if (!generic_node)
 570                                         return -ENOMEM;
 571                         }
 572                 }
 573         }
 574
 575         if (!m->partitions[PARTITION_ROOT].found) {
 576                 /* No root partition found? Then let's see if ther's one for the secondary architecture. And if not
 577                  * either, then check if there's a single generic one, and use that. */
 578
 579                 if (m->partitions[PARTITION_ROOT_VERITY].found)
 580                         return -EADDRNOTAVAIL;
 581
 582                 if (m->partitions[PARTITION_ROOT_SECONDARY].found) {
 583                         m->partitions[PARTITION_ROOT] = m->partitions[PARTITION_ROOT_SECONDARY];
 584                         zero(m->partitions[PARTITION_ROOT_SECONDARY]);
 585
 586                         m->partitions[PARTITION_ROOT_VERITY] = m->partitions[PARTITION_ROOT_SECONDARY_VERITY];
 587                         zero(m->partitions[PARTITION_ROOT_SECONDARY_VERITY]);
 588
 589                 } else if (flags & DISSECT_IMAGE_REQUIRE_ROOT) {
 590
 591                         /* If the root has was set, then we won't fallback to a generic node, because the root hash
 592                          * decides */
 593                         if (root_hash)
 594                                 return -EADDRNOTAVAIL;
 595
 596                         /* If we didn't find a generic node, then we can't fix this up either */
 597                         if (!generic_node)
 598                                 return -ENXIO;
 599
 600                         /* If we didn't find a properly marked root partition, but we did find a single suitable
 601                          * generic Linux partition, then use this as root partition, if the caller asked for it. */
 602                         if (multiple_generic)
 603                                 return -ENOTUNIQ;
 604
 605                         m->partitions[PARTITION_ROOT] = (DissectedPartition) {
 606                                 .found = true,
 607                                 .rw = generic_rw,
 608                                 .partno = generic_nr,
 609                                 .architecture = _ARCHITECTURE_INVALID,
 610                                 .node = TAKE_PTR(generic_node),
 611                                 .uuid = generic_uuid,
 612                         };
 613                 }
 614         }
 615
 616         if (root_hash) {
 617                 if (!m->partitions[PARTITION_ROOT_VERITY].found || !m->partitions[PARTITION_ROOT].found)
 618                         return -EADDRNOTAVAIL;
 619
 620                 /* If we found the primary root with the hash, then we definitely want to suppress any secondary root
 621                  * (which would be weird, after all the root hash should only be assigned to one pair of
 622                  * partitions... */
 623                 m->partitions[PARTITION_ROOT_SECONDARY].found = false;
 624                 m->partitions[PARTITION_ROOT_SECONDARY_VERITY].found = false;
 625
 626                 /* If we found a verity setup, then the root partition is necessarily read-only. */
 627                 m->partitions[PARTITION_ROOT].rw = false;
 628
 629                 m->verity = true;
 630         }
 631
 632         blkid_free_probe(b);
 633         b = NULL;
 634
 635         /* Fill in file system types if we don't know them yet. */
 636         for (i = 0; i < _PARTITION_DESIGNATOR_MAX; i++) {
 637                 DissectedPartition *p = m->partitions + i;
 638
 639                 if (!p->found)
 640                         continue;
 641
 642                 if (!p->fstype && p->node) {
 643                         r = probe_filesystem(p->node, &p->fstype);
 644                         if (r < 0 && r != -EUCLEAN)
 645                                 return r;
 646                 }
 647
 648                 if (streq_ptr(p->fstype, "crypto_LUKS"))
 649                         m->encrypted = true;
 650
 651                 if (p->fstype && fstype_is_ro(p->fstype))
 652                         p->rw = false;
 653         }
 654
 655         *ret = TAKE_PTR(m);
 656
 657         return 0;
 658 #else
 659         return -EOPNOTSUPP;
 660 #endif
 661 }
 662
 663 DissectedImage* dissected_image_unref(DissectedImage *m) {
 664         unsigned i;
 665
 666         if (!m)
 667                 return NULL;
 668
 669         for (i = 0; i < _PARTITION_DESIGNATOR_MAX; i++) {
 670                 free(m->partitions[i].fstype);
 671                 free(m->partitions[i].node);
 672                 free(m->partitions[i].decrypted_fstype);
 673                 free(m->partitions[i].decrypted_node);
 674         }
 675
 676         free(m->hostname);
 677         strv_free(m->machine_info);
 678         strv_free(m->os_release);
 679
 680         return mfree(m);
 681 }
 682
 683 static int is_loop_device(const char *path) {
 684         char s[SYS_BLOCK_PATH_MAX("/../loop/")];
 685         struct stat st;
 686
 687         assert(path);
 688
 689         if (stat(path, &st) < 0)
 690                 return -errno;
 691
 692         if (!S_ISBLK(st.st_mode))
 693                 return -ENOTBLK;
 694
 695         xsprintf_sys_block_path(s, "/loop/", st.st_dev);
 696         if (access(s, F_OK) < 0) {
 697                 if (errno != ENOENT)
 698                         return -errno;
 699
 700                 /* The device itself isn't a loop device, but maybe it's a partition and its parent is? */
 701                 xsprintf_sys_block_path(s, "/../loop/", st.st_dev);
 702                 if (access(s, F_OK) < 0)
 703                         return errno == ENOENT ? false : -errno;
 704         }
 705
 706         return true;
 707 }
 708
 709 static int mount_partition(
 710                 DissectedPartition *m,
 711                 const char *where,
 712                 const char *directory,
 713                 uid_t uid_shift,
 714                 DissectImageFlags flags) {
 715
 716         _cleanup_free_ char *chased = NULL, *options = NULL;
 717         const char *p, *node, *fstype;
 718         bool rw;
 719         int r;
 720
 721         assert(m);
 722         assert(where);
 723
 724         node = m->decrypted_node ?: m->node;
 725         fstype = m->decrypted_fstype ?: m->fstype;
 726
 727         if (!m->found || !node || !fstype)
 728                 return 0;
 729
 730         /* Stacked encryption? Yuck */
 731         if (streq_ptr(fstype, "crypto_LUKS"))
 732                 return -ELOOP;
 733
 734         rw = m->rw && !(flags & DISSECT_IMAGE_READ_ONLY);
 735
 736         if (directory) {
 737                 r = chase_symlinks(directory, where, CHASE_PREFIX_ROOT, &chased);
 738                 if (r < 0)
 739                         return r;
 740
 741                 p = chased;
 742         } else
 743                 p = where;
 744
 745         /* If requested, turn on discard support. */
 746         if (fstype_can_discard(fstype) &&
 747             ((flags & DISSECT_IMAGE_DISCARD) ||
 748              ((flags & DISSECT_IMAGE_DISCARD_ON_LOOP) && is_loop_device(m->node)))) {
 749                 options = strdup("discard");
 750                 if (!options)
 751                         return -ENOMEM;
 752         }
 753
 754         if (uid_is_valid(uid_shift) && uid_shift != 0 && fstype_can_uid_gid(fstype)) {
 755                 _cleanup_free_ char *uid_option = NULL;
 756
 757                 if (asprintf(&uid_option, "uid=" UID_FMT ",gid=" GID_FMT, uid_shift, (gid_t) uid_shift) < 0)
 758                         return -ENOMEM;
 759
 760                 if (!strextend_with_separator(&options, ",", uid_option, NULL))
 761                         return -ENOMEM;
 762         }
 763
 764         return mount_verbose(LOG_DEBUG, node, p, fstype, MS_NODEV|(rw ? 0 : MS_RDONLY), options);
 765 }
 766
 767 int dissected_image_mount(DissectedImage *m, const char *where, uid_t uid_shift, DissectImageFlags flags) {
 768         int r;
 769
 770         assert(m);
 771         assert(where);
 772
 773         if (!m->partitions[PARTITION_ROOT].found)
 774                 return -ENXIO;
 775
 776         if ((flags & DISSECT_IMAGE_MOUNT_NON_ROOT_ONLY) == 0) {
 777                 r = mount_partition(m->partitions + PARTITION_ROOT, where, NULL, uid_shift, flags);
 778                 if (r < 0)
 779                         return r;
 780
 781                 if (flags & DISSECT_IMAGE_VALIDATE_OS) {
 782                         r = path_is_os_tree(where);
 783                         if (r < 0)
 784                                 return r;
 785                         if (r == 0)
 786                                 return -EMEDIUMTYPE;
 787                 }
 788         }
 789
 790         if ((flags & DISSECT_IMAGE_MOUNT_ROOT_ONLY))
 791                 return 0;
 792
 793         r = mount_partition(m->partitions + PARTITION_HOME, where, "/home", uid_shift, flags);
 794         if (r < 0)
 795                 return r;
 796
 797         r = mount_partition(m->partitions + PARTITION_SRV, where, "/srv", uid_shift, flags);
 798         if (r < 0)
 799                 return r;
 800
 801         if (m->partitions[PARTITION_ESP].found) {
 802                 const char *mp;
 803
 804                 /* Mount the ESP to /efi if it exists and is empty. If it doesn't exist, use /boot instead. */
 805
 806                 FOREACH_STRING(mp, "/efi", "/boot") {
 807                         _cleanup_free_ char *p = NULL;
 808
 809                         r = chase_symlinks(mp, where, CHASE_PREFIX_ROOT, &p);
 810                         if (r < 0)
 811                                 continue;
 812
 813                         r = dir_is_empty(p);
 814                         if (r > 0) {
 815                                 r = mount_partition(m->partitions + PARTITION_ESP, where, mp, uid_shift, flags);
 816                                 if (r < 0)
 817                                         return r;
 818                         }
 819                 }
 820         }
 821
 822         return 0;
 823 }
 824
 825 #if HAVE_LIBCRYPTSETUP
 826 typedef struct DecryptedPartition {
 827         struct crypt_device *device;
 828         char *name;
 829         bool relinquished;
 830 } DecryptedPartition;
 831
 832 struct DecryptedImage {
 833         DecryptedPartition *decrypted;
 834         size_t n_decrypted;
 835         size_t n_allocated;
 836 };
 837 #endif
 838
 839 DecryptedImage* decrypted_image_unref(DecryptedImage* d) {
 840 #if HAVE_LIBCRYPTSETUP
 841         size_t i;
 842         int r;
 843
 844         if (!d)
 845                 return NULL;
 846
 847         for (i = 0; i < d->n_decrypted; i++) {
 848                 DecryptedPartition *p = d->decrypted + i;
 849
 850                 if (p->device && p->name && !p->relinquished) {
 851                         r = crypt_deactivate(p->device, p->name);
 852                         if (r < 0)
 853                                 log_debug_errno(r, "Failed to deactivate encrypted partition %s", p->name);
 854                 }
 855
 856                 if (p->device)
 857                         crypt_free(p->device);
 858                 free(p->name);
 859         }
 860
 861         free(d);
 862 #endif
 863         return NULL;
 864 }
 865
 866 #if HAVE_LIBCRYPTSETUP
 867
 868 static int make_dm_name_and_node(const void *original_node, const char *suffix, char **ret_name, char **ret_node) {
 869         _cleanup_free_ char *name = NULL, *node = NULL;
 870         const char *base;
 871
 872         assert(original_node);
 873         assert(suffix);
 874         assert(ret_name);
 875         assert(ret_node);
 876
 877         base = strrchr(original_node, '/');
 878         if (!base)
 879                 return -EINVAL;
 880         base++;
 881         if (isempty(base))
 882                 return -EINVAL;
 883
 884         name = strjoin(base, suffix);
 885         if (!name)
 886                 return -ENOMEM;
 887         if (!filename_is_valid(name))
 888                 return -EINVAL;
 889
 890         node = strjoin(crypt_get_dir(), "/", name);
 891         if (!node)
 892                 return -ENOMEM;
 893
 894         *ret_name = TAKE_PTR(name);
 895         *ret_node = TAKE_PTR(node);
 896
 897         return 0;
 898 }
 899
 900 static int decrypt_partition(
 901                 DissectedPartition *m,
 902                 const char *passphrase,
 903                 DissectImageFlags flags,
 904                 DecryptedImage *d) {
 905
 906         _cleanup_free_ char *node = NULL, *name = NULL;
 907         _cleanup_(crypt_freep) struct crypt_device *cd = NULL;
 908         int r;
 909
 910         assert(m);
 911         assert(d);
 912
 913         if (!m->found || !m->node || !m->fstype)
 914                 return 0;
 915
 916         if (!streq(m->fstype, "crypto_LUKS"))
 917                 return 0;
 918
 919         if (!passphrase)
 920                 return -ENOKEY;
 921
 922         r = make_dm_name_and_node(m->node, "-decrypted", &name, &node);
 923         if (r < 0)
 924                 return r;
 925
 926         if (!GREEDY_REALLOC0(d->decrypted, d->n_allocated, d->n_decrypted + 1))
 927                 return -ENOMEM;
 928
 929         r = crypt_init(&cd, m->node);
 930         if (r < 0)
 931                 return log_debug_errno(r, "Failed to initialize dm-crypt: %m");
 932
 933         r = crypt_load(cd, CRYPT_LUKS, NULL);
 934         if (r < 0)
 935                 return log_debug_errno(r, "Failed to load LUKS metadata: %m");
 936
 937         r = crypt_activate_by_passphrase(cd, name, CRYPT_ANY_SLOT, passphrase, strlen(passphrase),
 938                                          ((flags & DISSECT_IMAGE_READ_ONLY) ? CRYPT_ACTIVATE_READONLY : 0) |
 939                                          ((flags & DISSECT_IMAGE_DISCARD_ON_CRYPTO) ? CRYPT_ACTIVATE_ALLOW_DISCARDS : 0));
 940         if (r < 0) {
 941                 log_debug_errno(r, "Failed to activate LUKS device: %m");
 942                 return r == -EPERM ? -EKEYREJECTED : r;
 943         }
 944
 945         d->decrypted[d->n_decrypted].name = TAKE_PTR(name);
 946         d->decrypted[d->n_decrypted].device = TAKE_PTR(cd);
 947         d->n_decrypted++;
 948
 949         m->decrypted_node = TAKE_PTR(node);
 950
 951         return 0;
 952 }
 953
 954 static int verity_partition(
 955                 DissectedPartition *m,
 956                 DissectedPartition *v,
 957                 const void *root_hash,
 958                 size_t root_hash_size,
 959                 DissectImageFlags flags,
 960                 DecryptedImage *d) {
 961
 962         _cleanup_free_ char *node = NULL, *name = NULL;
 963         _cleanup_(crypt_freep) struct crypt_device *cd = NULL;
 964         int r;
 965
 966         assert(m);
 967         assert(v);
 968
 969         if (!root_hash)
 970                 return 0;
 971
 972         if (!m->found || !m->node || !m->fstype)
 973                 return 0;
 974         if (!v->found || !v->node || !v->fstype)
 975                 return 0;
 976
 977         if (!streq(v->fstype, "DM_verity_hash"))
 978                 return 0;
 979
 980         r = make_dm_name_and_node(m->node, "-verity", &name, &node);
 981         if (r < 0)
 982                 return r;
 983
 984         if (!GREEDY_REALLOC0(d->decrypted, d->n_allocated, d->n_decrypted + 1))
 985                 return -ENOMEM;
 986
 987         r = crypt_init(&cd, v->node);
 988         if (r < 0)
 989                 return r;
 990
 991         r = crypt_load(cd, CRYPT_VERITY, NULL);
 992         if (r < 0)
 993                 return r;
 994
 995         r = crypt_set_data_device(cd, m->node);
 996         if (r < 0)
 997                 return r;
 998
 999         r = crypt_activate_by_volume_key(cd, name, root_hash, root_hash_size, CRYPT_ACTIVATE_READONLY);
1000         if (r < 0)
1001                 return r;
1002
1003         d->decrypted[d->n_decrypted].name = TAKE_PTR(name);
1004         d->decrypted[d->n_decrypted].device = TAKE_PTR(cd);
1005         d->n_decrypted++;
1006
1007         m->decrypted_node = TAKE_PTR(node);
1008
1009         return 0;
1010 }
1011 #endif
1012
1013 int dissected_image_decrypt(
1014                 DissectedImage *m,
1015                 const char *passphrase,
1016                 const void *root_hash,
1017                 size_t root_hash_size,
1018                 DissectImageFlags flags,
1019                 DecryptedImage **ret) {
1020
1021 #if HAVE_LIBCRYPTSETUP
1022         _cleanup_(decrypted_image_unrefp) DecryptedImage *d = NULL;
1023         unsigned i;
1024         int r;
1025 #endif
1026
1027         assert(m);
1028         assert(root_hash || root_hash_size == 0);
1029
1030         /* Returns:
1031          *
1032          *      = 0           → There was nothing to decrypt
1033          *      > 0           → Decrypted successfully
1034          *      -ENOKEY       → There's something to decrypt but no key was supplied
1035          *      -EKEYREJECTED → Passed key was not correct
1036          */
1037
1038         if (root_hash && root_hash_size < sizeof(sd_id128_t))
1039                 return -EINVAL;
1040
1041         if (!m->encrypted && !m->verity) {
1042                 *ret = NULL;
1043                 return 0;
1044         }
1045
1046 #if HAVE_LIBCRYPTSETUP
1047         d = new0(DecryptedImage, 1);
1048         if (!d)
1049                 return -ENOMEM;
1050
1051         for (i = 0; i < _PARTITION_DESIGNATOR_MAX; i++) {
1052                 DissectedPartition *p = m->partitions + i;
1053                 int k;
1054
1055                 if (!p->found)
1056                         continue;
1057
1058                 r = decrypt_partition(p, passphrase, flags, d);
1059                 if (r < 0)
1060                         return r;
1061
1062                 k = PARTITION_VERITY_OF(i);
1063                 if (k >= 0) {
1064                         r = verity_partition(p, m->partitions + k, root_hash, root_hash_size, flags, d);
1065                         if (r < 0)
1066                                 return r;
1067                 }
1068
1069                 if (!p->decrypted_fstype && p->decrypted_node) {
1070                         r = probe_filesystem(p->decrypted_node, &p->decrypted_fstype);
1071                         if (r < 0 && r != -EUCLEAN)
1072                                 return r;
1073                 }
1074         }
1075
1076         *ret = TAKE_PTR(d);
1077
1078         return 1;
1079 #else
1080         return -EOPNOTSUPP;
1081 #endif
1082 }
1083
1084 int dissected_image_decrypt_interactively(
1085                 DissectedImage *m,
1086                 const char *passphrase,
1087                 const void *root_hash,
1088                 size_t root_hash_size,
1089                 DissectImageFlags flags,
1090                 DecryptedImage **ret) {
1091
1092         _cleanup_strv_free_erase_ char **z = NULL;
1093         int n = 3, r;
1094
1095         if (passphrase)
1096                 n--;
1097
1098         for (;;) {
1099                 r = dissected_image_decrypt(m, passphrase, root_hash, root_hash_size, flags, ret);
1100                 if (r >= 0)
1101                         return r;
1102                 if (r == -EKEYREJECTED)
1103                         log_error_errno(r, "Incorrect passphrase, try again!");
1104                 else if (r != -ENOKEY)
1105                         return log_error_errno(r, "Failed to decrypt image: %m");
1106
1107                 if (--n < 0) {
1108                         log_error("Too many retries.");
1109                         return -EKEYREJECTED;
1110                 }
1111
1112                 z = strv_free(z);
1113
1114                 r = ask_password_auto("Please enter image passphrase!", NULL, "dissect", "dissect", USEC_INFINITY, 0, &z);
1115                 if (r < 0)
1116                         return log_error_errno(r, "Failed to query for passphrase: %m");
1117
1118                 passphrase = z[0];
1119         }
1120 }
1121
1122 #if HAVE_LIBCRYPTSETUP
1123 static int deferred_remove(DecryptedPartition *p) {
1124
1125         struct dm_ioctl dm = {
1126                 .version = {
1127                         DM_VERSION_MAJOR,
1128                         DM_VERSION_MINOR,
1129                         DM_VERSION_PATCHLEVEL
1130                 },
1131                 .data_size = sizeof(dm),
1132                 .flags = DM_DEFERRED_REMOVE,
1133         };
1134
1135         _cleanup_close_ int fd = -1;
1136
1137         assert(p);
1138
1139         /* Unfortunately, libcryptsetup doesn't provide a proper API for this, hence call the ioctl() directly. */
1140
1141         fd = open("/dev/mapper/control", O_RDWR|O_CLOEXEC);
1142         if (fd < 0)
1143                 return -errno;
1144
1145         strncpy(dm.name, p->name, sizeof(dm.name));
1146
1147         if (ioctl(fd, DM_DEV_REMOVE, &dm))
1148                 return -errno;
1149
1150         return 0;
1151 }
1152 #endif
1153
1154 int decrypted_image_relinquish(DecryptedImage *d) {
1155
1156 #if HAVE_LIBCRYPTSETUP
1157         size_t i;
1158         int r;
1159 #endif
1160
1161         assert(d);
1162
1163         /* Turns on automatic removal after the last use ended for all DM devices of this image, and sets a boolean so
1164          * that we don't clean it up ourselves either anymore */
1165
1166 #if HAVE_LIBCRYPTSETUP
1167         for (i = 0; i < d->n_decrypted; i++) {
1168                 DecryptedPartition *p = d->decrypted + i;
1169
1170                 if (p->relinquished)
1171                         continue;
1172
1173                 r = deferred_remove(p);
1174                 if (r < 0)
1175                         return log_debug_errno(r, "Failed to mark %s for auto-removal: %m", p->name);
1176
1177                 p->relinquished = true;
1178         }
1179 #endif
1180
1181         return 0;
1182 }
1183
1184 int root_hash_load(const char *image, void **ret, size_t *ret_size) {
1185         _cleanup_free_ char *text = NULL;
1186         _cleanup_free_ void *k = NULL;
1187         size_t l;
1188         int r;
1189
1190         assert(image);
1191         assert(ret);
1192         assert(ret_size);
1193
1194         if (is_device_path(image)) {
1195                 /* If we are asked to load the root hash for a device node, exit early */
1196                 *ret = NULL;
1197                 *ret_size = 0;
1198                 return 0;
1199         }
1200
1201         r = getxattr_malloc(image, "user.verity.roothash", &text, true);
1202         if (r < 0) {
1203                 char *fn, *e, *n;
1204
1205                 if (!IN_SET(r, -ENODATA, -EOPNOTSUPP, -ENOENT))
1206                         return r;
1207
1208                 fn = newa(char, strlen(image) + STRLEN(".roothash") + 1);
1209                 n = stpcpy(fn, image);
1210                 e = endswith(fn, ".raw");
1211                 if (e)
1212                         n = e;
1213
1214                 strcpy(n, ".roothash");
1215
1216                 r = read_one_line_file(fn, &text);
1217                 if (r == -ENOENT) {
1218                         *ret = NULL;
1219                         *ret_size = 0;
1220                         return 0;
1221                 }
1222                 if (r < 0)
1223                         return r;
1224         }
1225
1226         r = unhexmem(text, strlen(text), &k, &l);
1227         if (r < 0)
1228                 return r;
1229         if (l < sizeof(sd_id128_t))
1230                 return -EINVAL;
1231
1232         *ret = TAKE_PTR(k);
1233         *ret_size = l;
1234
1235         return 1;
1236 }
1237
1238 int dissected_image_acquire_metadata(DissectedImage *m) {
1239
1240         enum {
1241                 META_HOSTNAME,
1242                 META_MACHINE_ID,
1243                 META_MACHINE_INFO,
1244                 META_OS_RELEASE,
1245                 _META_MAX,
1246         };
1247
1248         static const char *const paths[_META_MAX] = {
1249                 [META_HOSTNAME]     = "/etc/hostname\0",
1250                 [META_MACHINE_ID]   = "/etc/machine-id\0",
1251                 [META_MACHINE_INFO] = "/etc/machine-info\0",
1252                 [META_OS_RELEASE]   = "/etc/os-release\0/usr/lib/os-release\0",
1253         };
1254
1255         _cleanup_strv_free_ char **machine_info = NULL, **os_release = NULL;
1256         _cleanup_(rmdir_and_freep) char *t = NULL;
1257         _cleanup_(sigkill_waitp) pid_t child = 0;
1258         sd_id128_t machine_id = SD_ID128_NULL;
1259         _cleanup_free_ char *hostname = NULL;
1260         unsigned n_meta_initialized = 0, k;
1261         int fds[2 * _META_MAX], r;
1262
1263         BLOCK_SIGNALS(SIGCHLD);
1264
1265         assert(m);
1266
1267         for (; n_meta_initialized < _META_MAX; n_meta_initialized ++)
1268                 if (pipe2(fds + 2*n_meta_initialized, O_CLOEXEC) < 0) {
1269                         r = -errno;
1270                         goto finish;
1271                 }
1272
1273         r = mkdtemp_malloc("/tmp/dissect-XXXXXX", &t);
1274         if (r < 0)
1275                 goto finish;
1276
1277         r = safe_fork("(sd-dissect)", FORK_RESET_SIGNALS|FORK_DEATHSIG|FORK_NEW_MOUNTNS|FORK_MOUNTNS_SLAVE, &child);
1278         if (r < 0)
1279                 goto finish;
1280         if (r == 0) {
1281                 r = dissected_image_mount(m, t, UID_INVALID, DISSECT_IMAGE_READ_ONLY|DISSECT_IMAGE_MOUNT_ROOT_ONLY|DISSECT_IMAGE_VALIDATE_OS);
1282                 if (r < 0) {
1283                         log_debug_errno(r, "Failed to mount dissected image: %m");
1284                         _exit(EXIT_FAILURE);
1285                 }
1286
1287                 for (k = 0; k < _META_MAX; k++) {
1288                         _cleanup_close_ int fd = -1;
1289                         const char *p;
1290
1291                         fds[2*k] = safe_close(fds[2*k]);
1292
1293                         NULSTR_FOREACH(p, paths[k]) {
1294                                 fd = chase_symlinks_and_open(p, t, CHASE_PREFIX_ROOT, O_RDONLY|O_CLOEXEC|O_NOCTTY, NULL);
1295                                 if (fd >= 0)
1296                                         break;
1297                         }
1298                         if (fd < 0) {
1299                                 log_debug_errno(fd, "Failed to read %s file of image, ignoring: %m", paths[k]);
1300                                 continue;
1301                         }
1302
1303                         r = copy_bytes(fd, fds[2*k+1], (uint64_t) -1, 0);
1304                         if (r < 0)
1305                                 _exit(EXIT_FAILURE);
1306
1307                         fds[2*k+1] = safe_close(fds[2*k+1]);
1308                 }
1309
1310                 _exit(EXIT_SUCCESS);
1311         }
1312
1313         for (k = 0; k < _META_MAX; k++) {
1314                 _cleanup_fclose_ FILE *f = NULL;
1315
1316                 fds[2*k+1] = safe_close(fds[2*k+1]);
1317
1318                 f = fdopen(fds[2*k], "re");
1319                 if (!f) {
1320                         r = -errno;
1321                         goto finish;
1322                 }
1323
1324                 fds[2*k] = -1;
1325
1326                 switch (k) {
1327
1328                 case META_HOSTNAME:
1329                         r = read_etc_hostname_stream(f, &hostname);
1330                         if (r < 0)
1331                                 log_debug_errno(r, "Failed to read /etc/hostname: %m");
1332
1333                         break;
1334
1335                 case META_MACHINE_ID: {
1336                         _cleanup_free_ char *line = NULL;
1337
1338                         r = read_line(f, LONG_LINE_MAX, &line);
1339                         if (r < 0)
1340                                 log_debug_errno(r, "Failed to read /etc/machine-id: %m");
1341                         else if (r == 33) {
1342                                 r = sd_id128_from_string(line, &machine_id);
1343                                 if (r < 0)
1344                                         log_debug_errno(r, "Image contains invalid /etc/machine-id: %s", line);
1345                         } else if (r == 0)
1346                                 log_debug("/etc/machine-id file is empty.");
1347                         else
1348                                 log_debug("/etc/machine-id has unexpected length %i.", r);
1349
1350                         break;
1351                 }
1352
1353                 case META_MACHINE_INFO:
1354                         r = load_env_file_pairs(f, "machine-info", NULL, &machine_info);
1355                         if (r < 0)
1356                                 log_debug_errno(r, "Failed to read /etc/machine-info: %m");
1357
1358                         break;
1359
1360                 case META_OS_RELEASE:
1361                         r = load_env_file_pairs(f, "os-release", NULL, &os_release);
1362                         if (r < 0)
1363                                 log_debug_errno(r, "Failed to read OS release file: %m");
1364
1365                         break;
1366                 }
1367         }
1368
1369         r = wait_for_terminate_and_check("(sd-dissect)", child, 0);
1370         child = 0;
1371         if (r < 0)
1372                 goto finish;
1373         if (r != EXIT_SUCCESS)
1374                 return -EPROTO;
1375
1376         free_and_replace(m->hostname, hostname);
1377         m->machine_id = machine_id;
1378         strv_free_and_replace(m->machine_info, machine_info);
1379         strv_free_and_replace(m->os_release, os_release);
1380
1381 finish:
1382         for (k = 0; k < n_meta_initialized; k++)
1383                 safe_close_pair(fds + 2*k);
1384
1385         return r;
1386 }
1387
1388 int dissect_image_and_warn(
1389                 int fd,
1390                 const char *name,
1391                 const void *root_hash,
1392                 size_t root_hash_size,
1393                 DissectImageFlags flags,
1394                 DissectedImage **ret) {
1395
1396         _cleanup_free_ char *buffer = NULL;
1397         int r;
1398
1399         if (!name) {
1400                 r = fd_get_path(fd, &buffer);
1401                 if (r < 0)
1402                         return r;
1403
1404                 name = buffer;
1405         }
1406
1407         r = dissect_image(fd, root_hash, root_hash_size, flags, ret);
1408
1409         switch (r) {
1410
1411         case -EOPNOTSUPP:
1412                 return log_error_errno(r, "Dissecting images is not supported, compiled without blkid support.");
1413
1414         case -ENOPKG:
1415                 return log_error_errno(r, "Couldn't identify a suitable partition table or file system in '%s'.", name);
1416
1417         case -EADDRNOTAVAIL:
1418                 return log_error_errno(r, "No root partition for specified root hash found in '%s'.", name);
1419
1420         case -ENOTUNIQ:
1421                 return log_error_errno(r, "Multiple suitable root partitions found in image '%s'.", name);
1422
1423         case -ENXIO:
1424                 return log_error_errno(r, "No suitable root partition found in image '%s'.", name);
1425
1426         case -EPROTONOSUPPORT:
1427                 return log_error_errno(r, "Device '%s' is loopback block device with partition scanning turned off, please turn it on.", name);
1428
1429         default:
1430                 if (r < 0)
1431                         return log_error_errno(r, "Failed to dissect image '%s': %m", name);
1432
1433                 return r;
1434         }
1435 }
1436
1437 static const char *const partition_designator_table[] = {
1438         [PARTITION_ROOT] = "root",
1439         [PARTITION_ROOT_SECONDARY] = "root-secondary",
1440         [PARTITION_HOME] = "home",
1441         [PARTITION_SRV] = "srv",
1442         [PARTITION_ESP] = "esp",
1443         [PARTITION_SWAP] = "swap",
1444         [PARTITION_ROOT_VERITY] = "root-verity",
1445         [PARTITION_ROOT_SECONDARY_VERITY] = "root-secondary-verity",
1446 };
1447
1448 DEFINE_STRING_TABLE_LOOKUP(partition_designator, int);