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 "udev-util.h"
  44 #include "user-util.h"
  45 #include "xattr-util.h"
  46
  47 int probe_filesystem(const char *node, char **ret_fstype) {
  48         /* Try to find device content type and return it in *ret_fstype. If nothing is found,
  49          * 0/NULL will be returned. -EUCLEAN will be returned for ambigous results, and an
  50          * different error otherwise. */
  51
  52 #if HAVE_BLKID
  53         _cleanup_(blkid_free_probep) blkid_probe b = NULL;
  54         const char *fstype;
  55         int r;
  56
  57         errno = 0;
  58         b = blkid_new_probe_from_filename(node);
  59         if (!b)
  60                 return -errno ?: -ENOMEM;
  61
  62         blkid_probe_enable_superblocks(b, 1);
  63         blkid_probe_set_superblocks_flags(b, BLKID_SUBLKS_TYPE);
  64
  65         errno = 0;
  66         r = blkid_do_safeprobe(b);
  67         if (r == 1) {
  68                 log_debug("No type detected on partition %s", node);
  69                 goto not_found;
  70         }
  71         if (r == -2) {
  72                 log_debug("Results ambiguous for partition %s", node);
  73                 return -EUCLEAN;
  74         }
  75         if (r != 0)
  76                 return -errno ?: -EIO;
  77
  78         (void) blkid_probe_lookup_value(b, "TYPE", &fstype, NULL);
  79
  80         if (fstype) {
  81                 char *t;
  82
  83                 t = strdup(fstype);
  84                 if (!t)
  85                         return -ENOMEM;
  86
  87                 *ret_fstype = t;
  88                 return 1;
  89         }
  90
  91 not_found:
  92         *ret_fstype = NULL;
  93         return 0;
  94 #else
  95         return -EOPNOTSUPP;
  96 #endif
  97 }
  98
  99 #if HAVE_BLKID
 100 /* Detect RPMB and Boot partitions, which are not listed by blkid.
 101  * See https://github.com/systemd/systemd/issues/5806. */
 102 static bool device_is_mmc_special_partition(sd_device *d) {
 103         const char *sysname;
 104
 105         assert(d);
 106
 107         if (sd_device_get_sysname(d, &sysname) < 0)
 108                 return false;
 109
 110         return startswith(sysname, "mmcblk") &&
 111                 (endswith(sysname, "rpmb") || endswith(sysname, "boot0") || endswith(sysname, "boot1"));
 112 }
 113
 114 static bool device_is_block(sd_device *d) {
 115         const char *ss;
 116
 117         assert(d);
 118
 119         if (sd_device_get_subsystem(d, &ss) < 0)
 120                 return false;
 121
 122         return streq(ss, "block");
 123 }
 124
 125 static int enumerator_for_parent(sd_device *d, sd_device_enumerator **ret) {
 126         _cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL;
 127         int r;
 128
 129         assert(d);
 130         assert(ret);
 131
 132         r = sd_device_enumerator_new(&e);
 133         if (r < 0)
 134                 return r;
 135
 136         r = sd_device_enumerator_allow_uninitialized(e);
 137         if (r < 0)
 138                 return r;
 139
 140         r = sd_device_enumerator_add_match_parent(e, d);
 141         if (r < 0)
 142                 return r;
 143
 144         *ret = TAKE_PTR(e);
 145         return 0;
 146 }
 147
 148 /* how many times to wait for the device nodes to appear */
 149 #define N_DEVICE_NODE_LIST_ATTEMPTS 10
 150
 151 static int wait_for_partitions_to_appear(
 152                 int fd,
 153                 sd_device *d,
 154                 unsigned num_partitions,
 155                 DissectImageFlags flags,
 156                 sd_device_enumerator **ret_enumerator) {
 157
 158         _cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL;
 159         sd_device *q;
 160         unsigned n;
 161         int r;
 162
 163         assert(fd >= 0);
 164         assert(d);
 165         assert(ret_enumerator);
 166
 167         r = enumerator_for_parent(d, &e);
 168         if (r < 0)
 169                 return r;
 170
 171         /* Count the partitions enumerated by the kernel */
 172         n = 0;
 173         FOREACH_DEVICE(e, q) {
 174                 if (sd_device_get_devnum(q, NULL) < 0)
 175                         continue;
 176                 if (!device_is_block(q))
 177                         continue;
 178                 if (device_is_mmc_special_partition(q))
 179                         continue;
 180
 181                 if (!FLAGS_SET(flags, DISSECT_IMAGE_NO_UDEV)) {
 182                         r = device_wait_for_initialization(q, "block", NULL);
 183                         if (r < 0)
 184                                 return r;
 185                 }
 186
 187                 n++;
 188         }
 189
 190         if (n == num_partitions + 1) {
 191                 *ret_enumerator = TAKE_PTR(e);
 192                 return 0; /* success! */
 193         }
 194         if (n > num_partitions + 1)
 195                 return log_debug_errno(SYNTHETIC_ERRNO(EIO),
 196                                        "blkid and kernel partition lists do not match.");
 197
 198         /* The kernel has probed fewer partitions than blkid? Maybe the kernel prober is still running or it
 199          * got EBUSY because udev already opened the device. Let's reprobe the device, which is a synchronous
 200          * call that waits until probing is complete. */
 201
 202         for (unsigned j = 0; ; j++) {
 203                 if (j++ > 20)
 204                         return -EBUSY;
 205
 206                 if (ioctl(fd, BLKRRPART, 0) >= 0)
 207                         break;
 208                 r = -errno;
 209                 if (r == -EINVAL) {
 210                         struct loop_info64 info;
 211
 212                         /* If we are running on a loop device that has partition scanning off, return
 213                          * an explicit recognizable error about this, so that callers can generate a
 214                          * proper message explaining the situation. */
 215
 216                         if (ioctl(fd, LOOP_GET_STATUS64, &info) >= 0 && (info.lo_flags & LO_FLAGS_PARTSCAN) == 0) {
 217                                 log_debug("Device is a loop device and partition scanning is off!");
 218                                 return -EPROTONOSUPPORT;
 219                         }
 220                 }
 221                 if (r != -EBUSY)
 222                         return r;
 223
 224                 /* If something else has the device open, such as an udev rule, the ioctl will return
 225                  * EBUSY. Since there's no way to wait until it isn't busy anymore, let's just wait a bit,
 226                  * and try again.
 227                  *
 228                  * This is really something they should fix in the kernel! */
 229                 (void) usleep(50 * USEC_PER_MSEC);
 230
 231         }
 232
 233         return -EAGAIN; /* no success yet, try again */
 234 }
 235
 236 static int loop_wait_for_partitions_to_appear(
 237                 int fd,
 238                 sd_device *d,
 239                 unsigned num_partitions,
 240                 DissectImageFlags flags,
 241                 sd_device_enumerator **ret_enumerator) {
 242         _cleanup_(sd_device_unrefp) sd_device *device = NULL;
 243         int r;
 244
 245         assert(fd >= 0);
 246         assert(d);
 247         assert(ret_enumerator);
 248
 249         log_debug("Waiting for device (parent + %d partitions) to appear...", num_partitions);
 250
 251         if (!FLAGS_SET(flags, DISSECT_IMAGE_NO_UDEV)) {
 252                 r = device_wait_for_initialization(d, "block", &device);
 253                 if (r < 0)
 254                         return r;
 255         } else
 256                 device = sd_device_ref(d);
 257
 258         for (unsigned i = 0; i < N_DEVICE_NODE_LIST_ATTEMPTS; i++) {
 259                 r = wait_for_partitions_to_appear(fd, device, num_partitions, flags, ret_enumerator);
 260                 if (r != -EAGAIN)
 261                         return r;
 262         }
 263
 264         return log_debug_errno(SYNTHETIC_ERRNO(ENXIO),
 265                                "Kernel partitions dit not appear within %d attempts",
 266                                N_DEVICE_NODE_LIST_ATTEMPTS);
 267 }
 268
 269 #endif
 270
 271 int dissect_image(
 272                 int fd,
 273                 const void *root_hash,
 274                 size_t root_hash_size,
 275                 DissectImageFlags flags,
 276                 DissectedImage **ret) {
 277
 278 #if HAVE_BLKID
 279         sd_id128_t root_uuid = SD_ID128_NULL, verity_uuid = SD_ID128_NULL;
 280         _cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL;
 281         bool is_gpt, is_mbr, generic_rw, multiple_generic = false;
 282         _cleanup_(sd_device_unrefp) sd_device *d = NULL;
 283         _cleanup_(dissected_image_unrefp) DissectedImage *m = NULL;
 284         _cleanup_(blkid_free_probep) blkid_probe b = NULL;
 285         _cleanup_free_ char *generic_node = NULL;
 286         sd_id128_t generic_uuid = SD_ID128_NULL;
 287         const char *pttype = NULL;
 288         blkid_partlist pl;
 289         int r, generic_nr;
 290         struct stat st;
 291         sd_device *q;
 292         unsigned i;
 293
 294         assert(fd >= 0);
 295         assert(ret);
 296         assert(root_hash || root_hash_size == 0);
 297
 298         /* Probes a disk image, and returns information about what it found in *ret.
 299          *
 300          * Returns -ENOPKG if no suitable partition table or file system could be found.
 301          * Returns -EADDRNOTAVAIL if a root hash was specified but no matching root/verity partitions found. */
 302
 303         if (root_hash) {
 304                 /* If a root hash is supplied, then we use the root partition that has a UUID that match the first
 305                  * 128bit of the root hash. And we use the verity partition that has a UUID that match the final
 306                  * 128bit. */
 307
 308                 if (root_hash_size < sizeof(sd_id128_t))
 309                         return -EINVAL;
 310
 311                 memcpy(&root_uuid, root_hash, sizeof(sd_id128_t));
 312                 memcpy(&verity_uuid, (const uint8_t*) root_hash + root_hash_size - sizeof(sd_id128_t), sizeof(sd_id128_t));
 313
 314                 if (sd_id128_is_null(root_uuid))
 315                         return -EINVAL;
 316                 if (sd_id128_is_null(verity_uuid))
 317                         return -EINVAL;
 318         }
 319
 320         if (fstat(fd, &st) < 0)
 321                 return -errno;
 322
 323         if (!S_ISBLK(st.st_mode))
 324                 return -ENOTBLK;
 325
 326         b = blkid_new_probe();
 327         if (!b)
 328                 return -ENOMEM;
 329
 330         errno = 0;
 331         r = blkid_probe_set_device(b, fd, 0, 0);
 332         if (r != 0)
 333                 return -errno ?: -ENOMEM;
 334
 335         if ((flags & DISSECT_IMAGE_GPT_ONLY) == 0) {
 336                 /* Look for file system superblocks, unless we only shall look for GPT partition tables */
 337                 blkid_probe_enable_superblocks(b, 1);
 338                 blkid_probe_set_superblocks_flags(b, BLKID_SUBLKS_TYPE|BLKID_SUBLKS_USAGE);
 339         }
 340
 341         blkid_probe_enable_partitions(b, 1);
 342         blkid_probe_set_partitions_flags(b, BLKID_PARTS_ENTRY_DETAILS);
 343
 344         errno = 0;
 345         r = blkid_do_safeprobe(b);
 346         if (IN_SET(r, -2, 1)) {
 347                 log_debug("Failed to identify any partition table.");
 348                 return -ENOPKG;
 349         }
 350         if (r != 0)
 351                 return -errno ?: -EIO;
 352
 353         m = new0(DissectedImage, 1);
 354         if (!m)
 355                 return -ENOMEM;
 356
 357         r = sd_device_new_from_devnum(&d, 'b', st.st_rdev);
 358         if (r < 0)
 359                 return r;
 360
 361         if (!(flags & DISSECT_IMAGE_GPT_ONLY) &&
 362             (flags & DISSECT_IMAGE_REQUIRE_ROOT)) {
 363                 const char *usage = NULL;
 364
 365                 (void) blkid_probe_lookup_value(b, "USAGE", &usage, NULL);
 366                 if (STRPTR_IN_SET(usage, "filesystem", "crypto")) {
 367                         _cleanup_free_ char *t = NULL, *n = NULL;
 368                         const char *fstype = NULL;
 369
 370                         /* OK, we have found a file system, that's our root partition then. */
 371                         (void) blkid_probe_lookup_value(b, "TYPE", &fstype, NULL);
 372
 373                         if (fstype) {
 374                                 t = strdup(fstype);
 375                                 if (!t)
 376                                         return -ENOMEM;
 377                         }
 378
 379                         r = device_path_make_major_minor(st.st_mode, st.st_rdev, &n);
 380                         if (r < 0)
 381                                 return r;
 382
 383                         m->partitions[PARTITION_ROOT] = (DissectedPartition) {
 384                                 .found = true,
 385                                 .rw = true,
 386                                 .partno = -1,
 387                                 .architecture = _ARCHITECTURE_INVALID,
 388                                 .fstype = TAKE_PTR(t),
 389                                 .node = TAKE_PTR(n),
 390                         };
 391
 392                         m->encrypted = streq_ptr(fstype, "crypto_LUKS");
 393
 394                         r = loop_wait_for_partitions_to_appear(fd, d, 0, flags, &e);
 395                         if (r < 0)
 396                                 return r;
 397
 398                         *ret = TAKE_PTR(m);
 399
 400                         return 0;
 401                 }
 402         }
 403
 404         (void) blkid_probe_lookup_value(b, "PTTYPE", &pttype, NULL);
 405         if (!pttype)
 406                 return -ENOPKG;
 407
 408         is_gpt = streq_ptr(pttype, "gpt");
 409         is_mbr = streq_ptr(pttype, "dos");
 410
 411         if (!is_gpt && ((flags & DISSECT_IMAGE_GPT_ONLY) || !is_mbr))
 412                 return -ENOPKG;
 413
 414         errno = 0;
 415         pl = blkid_probe_get_partitions(b);
 416         if (!pl)
 417                 return -errno ?: -ENOMEM;
 418
 419         r = loop_wait_for_partitions_to_appear(fd, d, blkid_partlist_numof_partitions(pl), flags, &e);
 420         if (r < 0)
 421                 return r;
 422
 423         FOREACH_DEVICE(e, q) {
 424                 unsigned long long pflags;
 425                 blkid_partition pp;
 426                 const char *node;
 427                 dev_t qn;
 428                 int nr;
 429
 430                 r = sd_device_get_devnum(q, &qn);
 431                 if (r < 0)
 432                         continue;
 433
 434                 if (st.st_rdev == qn)
 435                         continue;
 436
 437                 if (!device_is_block(q))
 438                         continue;
 439
 440                 if (device_is_mmc_special_partition(q))
 441                         continue;
 442
 443                 r = sd_device_get_devname(q, &node);
 444                 if (r < 0)
 445                         continue;
 446
 447                 pp = blkid_partlist_devno_to_partition(pl, qn);
 448                 if (!pp)
 449                         continue;
 450
 451                 pflags = blkid_partition_get_flags(pp);
 452
 453                 nr = blkid_partition_get_partno(pp);
 454                 if (nr < 0)
 455                         continue;
 456
 457                 if (is_gpt) {
 458                         int designator = _PARTITION_DESIGNATOR_INVALID, architecture = _ARCHITECTURE_INVALID;
 459                         const char *stype, *sid, *fstype = NULL;
 460                         sd_id128_t type_id, id;
 461                         bool rw = true;
 462
 463                         sid = blkid_partition_get_uuid(pp);
 464                         if (!sid)
 465                                 continue;
 466                         if (sd_id128_from_string(sid, &id) < 0)
 467                                 continue;
 468
 469                         stype = blkid_partition_get_type_string(pp);
 470                         if (!stype)
 471                                 continue;
 472                         if (sd_id128_from_string(stype, &type_id) < 0)
 473                                 continue;
 474
 475                         if (sd_id128_equal(type_id, GPT_HOME)) {
 476
 477                                 if (pflags & GPT_FLAG_NO_AUTO)
 478                                         continue;
 479
 480                                 designator = PARTITION_HOME;
 481                                 rw = !(pflags & GPT_FLAG_READ_ONLY);
 482                         } else if (sd_id128_equal(type_id, GPT_SRV)) {
 483
 484                                 if (pflags & GPT_FLAG_NO_AUTO)
 485                                         continue;
 486
 487                                 designator = PARTITION_SRV;
 488                                 rw = !(pflags & GPT_FLAG_READ_ONLY);
 489                         } else if (sd_id128_equal(type_id, GPT_ESP)) {
 490
 491                                 /* Note that we don't check the GPT_FLAG_NO_AUTO flag for the ESP, as it is not defined
 492                                  * there. We instead check the GPT_FLAG_NO_BLOCK_IO_PROTOCOL, as recommended by the
 493                                  * UEFI spec (See "12.3.3 Number and Location of System Partitions"). */
 494
 495                                 if (pflags & GPT_FLAG_NO_BLOCK_IO_PROTOCOL)
 496                                         continue;
 497
 498                                 designator = PARTITION_ESP;
 499                                 fstype = "vfat";
 500                         }
 501 #ifdef GPT_ROOT_NATIVE
 502                         else if (sd_id128_equal(type_id, GPT_ROOT_NATIVE)) {
 503
 504                                 if (pflags & GPT_FLAG_NO_AUTO)
 505                                         continue;
 506
 507                                 /* If a root ID is specified, ignore everything but the root id */
 508                                 if (!sd_id128_is_null(root_uuid) && !sd_id128_equal(root_uuid, id))
 509                                         continue;
 510
 511                                 designator = PARTITION_ROOT;
 512                                 architecture = native_architecture();
 513                                 rw = !(pflags & GPT_FLAG_READ_ONLY);
 514                         } else if (sd_id128_equal(type_id, GPT_ROOT_NATIVE_VERITY)) {
 515
 516                                 if (pflags & GPT_FLAG_NO_AUTO)
 517                                         continue;
 518
 519                                 m->can_verity = true;
 520
 521                                 /* Ignore verity unless a root hash is specified */
 522                                 if (sd_id128_is_null(verity_uuid) || !sd_id128_equal(verity_uuid, id))
 523                                         continue;
 524
 525                                 designator = PARTITION_ROOT_VERITY;
 526                                 fstype = "DM_verity_hash";
 527                                 architecture = native_architecture();
 528                                 rw = false;
 529                         }
 530 #endif
 531 #ifdef GPT_ROOT_SECONDARY
 532                         else if (sd_id128_equal(type_id, GPT_ROOT_SECONDARY)) {
 533
 534                                 if (pflags & GPT_FLAG_NO_AUTO)
 535                                         continue;
 536
 537                                 /* If a root ID is specified, ignore everything but the root id */
 538                                 if (!sd_id128_is_null(root_uuid) && !sd_id128_equal(root_uuid, id))
 539                                         continue;
 540
 541                                 designator = PARTITION_ROOT_SECONDARY;
 542                                 architecture = SECONDARY_ARCHITECTURE;
 543                                 rw = !(pflags & GPT_FLAG_READ_ONLY);
 544                         } else if (sd_id128_equal(type_id, GPT_ROOT_SECONDARY_VERITY)) {
 545
 546                                 if (pflags & GPT_FLAG_NO_AUTO)
 547                                         continue;
 548
 549                                 m->can_verity = true;
 550
 551                                 /* Ignore verity unless root has is specified */
 552                                 if (sd_id128_is_null(verity_uuid) || !sd_id128_equal(verity_uuid, id))
 553                                         continue;
 554
 555                                 designator = PARTITION_ROOT_SECONDARY_VERITY;
 556                                 fstype = "DM_verity_hash";
 557                                 architecture = SECONDARY_ARCHITECTURE;
 558                                 rw = false;
 559                         }
 560 #endif
 561                         else if (sd_id128_equal(type_id, GPT_SWAP)) {
 562
 563                                 if (pflags & GPT_FLAG_NO_AUTO)
 564                                         continue;
 565
 566                                 designator = PARTITION_SWAP;
 567                                 fstype = "swap";
 568                         } else if (sd_id128_equal(type_id, GPT_LINUX_GENERIC)) {
 569
 570                                 if (pflags & GPT_FLAG_NO_AUTO)
 571                                         continue;
 572
 573                                 if (generic_node)
 574                                         multiple_generic = true;
 575                                 else {
 576                                         generic_nr = nr;
 577                                         generic_rw = !(pflags & GPT_FLAG_READ_ONLY);
 578                                         generic_uuid = id;
 579                                         generic_node = strdup(node);
 580                                         if (!generic_node)
 581                                                 return -ENOMEM;
 582                                 }
 583                         }
 584
 585                         if (designator != _PARTITION_DESIGNATOR_INVALID) {
 586                                 _cleanup_free_ char *t = NULL, *n = NULL;
 587
 588                                 /* First one wins */
 589                                 if (m->partitions[designator].found)
 590                                         continue;
 591
 592                                 if (fstype) {
 593                                         t = strdup(fstype);
 594                                         if (!t)
 595                                                 return -ENOMEM;
 596                                 }
 597
 598                                 n = strdup(node);
 599                                 if (!n)
 600                                         return -ENOMEM;
 601
 602                                 m->partitions[designator] = (DissectedPartition) {
 603                                         .found = true,
 604                                         .partno = nr,
 605                                         .rw = rw,
 606                                         .architecture = architecture,
 607                                         .node = TAKE_PTR(n),
 608                                         .fstype = TAKE_PTR(t),
 609                                         .uuid = id,
 610                                 };
 611                         }
 612
 613                 } else if (is_mbr) {
 614
 615                         if (pflags != 0x80) /* Bootable flag */
 616                                 continue;
 617
 618                         if (blkid_partition_get_type(pp) != 0x83) /* Linux partition */
 619                                 continue;
 620
 621                         if (generic_node)
 622                                 multiple_generic = true;
 623                         else {
 624                                 generic_nr = nr;
 625                                 generic_rw = true;
 626                                 generic_node = strdup(node);
 627                                 if (!generic_node)
 628                                         return -ENOMEM;
 629                         }
 630                 }
 631         }
 632
 633         if (!m->partitions[PARTITION_ROOT].found) {
 634                 /* No root partition found? Then let's see if ther's one for the secondary architecture. And if not
 635                  * either, then check if there's a single generic one, and use that. */
 636
 637                 if (m->partitions[PARTITION_ROOT_VERITY].found)
 638                         return -EADDRNOTAVAIL;
 639
 640                 if (m->partitions[PARTITION_ROOT_SECONDARY].found) {
 641                         m->partitions[PARTITION_ROOT] = m->partitions[PARTITION_ROOT_SECONDARY];
 642                         zero(m->partitions[PARTITION_ROOT_SECONDARY]);
 643
 644                         m->partitions[PARTITION_ROOT_VERITY] = m->partitions[PARTITION_ROOT_SECONDARY_VERITY];
 645                         zero(m->partitions[PARTITION_ROOT_SECONDARY_VERITY]);
 646
 647                 } else if (flags & DISSECT_IMAGE_REQUIRE_ROOT) {
 648
 649                         /* If the root has was set, then we won't fallback to a generic node, because the root hash
 650                          * decides */
 651                         if (root_hash)
 652                                 return -EADDRNOTAVAIL;
 653
 654                         /* If we didn't find a generic node, then we can't fix this up either */
 655                         if (!generic_node)
 656                                 return -ENXIO;
 657
 658                         /* If we didn't find a properly marked root partition, but we did find a single suitable
 659                          * generic Linux partition, then use this as root partition, if the caller asked for it. */
 660                         if (multiple_generic)
 661                                 return -ENOTUNIQ;
 662
 663                         m->partitions[PARTITION_ROOT] = (DissectedPartition) {
 664                                 .found = true,
 665                                 .rw = generic_rw,
 666                                 .partno = generic_nr,
 667                                 .architecture = _ARCHITECTURE_INVALID,
 668                                 .node = TAKE_PTR(generic_node),
 669                                 .uuid = generic_uuid,
 670                         };
 671                 }
 672         }
 673
 674         if (root_hash) {
 675                 if (!m->partitions[PARTITION_ROOT_VERITY].found || !m->partitions[PARTITION_ROOT].found)
 676                         return -EADDRNOTAVAIL;
 677
 678                 /* If we found the primary root with the hash, then we definitely want to suppress any secondary root
 679                  * (which would be weird, after all the root hash should only be assigned to one pair of
 680                  * partitions... */
 681                 m->partitions[PARTITION_ROOT_SECONDARY].found = false;
 682                 m->partitions[PARTITION_ROOT_SECONDARY_VERITY].found = false;
 683
 684                 /* If we found a verity setup, then the root partition is necessarily read-only. */
 685                 m->partitions[PARTITION_ROOT].rw = false;
 686
 687                 m->verity = true;
 688         }
 689
 690         blkid_free_probe(b);
 691         b = NULL;
 692
 693         /* Fill in file system types if we don't know them yet. */
 694         for (i = 0; i < _PARTITION_DESIGNATOR_MAX; i++) {
 695                 DissectedPartition *p = m->partitions + i;
 696
 697                 if (!p->found)
 698                         continue;
 699
 700                 if (!p->fstype && p->node) {
 701                         r = probe_filesystem(p->node, &p->fstype);
 702                         if (r < 0 && r != -EUCLEAN)
 703                                 return r;
 704                 }
 705
 706                 if (streq_ptr(p->fstype, "crypto_LUKS"))
 707                         m->encrypted = true;
 708
 709                 if (p->fstype && fstype_is_ro(p->fstype))
 710                         p->rw = false;
 711         }
 712
 713         *ret = TAKE_PTR(m);
 714
 715         return 0;
 716 #else
 717         return -EOPNOTSUPP;
 718 #endif
 719 }
 720
 721 DissectedImage* dissected_image_unref(DissectedImage *m) {
 722         unsigned i;
 723
 724         if (!m)
 725                 return NULL;
 726
 727         for (i = 0; i < _PARTITION_DESIGNATOR_MAX; i++) {
 728                 free(m->partitions[i].fstype);
 729                 free(m->partitions[i].node);
 730                 free(m->partitions[i].decrypted_fstype);
 731                 free(m->partitions[i].decrypted_node);
 732         }
 733
 734         free(m->hostname);
 735         strv_free(m->machine_info);
 736         strv_free(m->os_release);
 737
 738         return mfree(m);
 739 }
 740
 741 static int is_loop_device(const char *path) {
 742         char s[SYS_BLOCK_PATH_MAX("/../loop/")];
 743         struct stat st;
 744
 745         assert(path);
 746
 747         if (stat(path, &st) < 0)
 748                 return -errno;
 749
 750         if (!S_ISBLK(st.st_mode))
 751                 return -ENOTBLK;
 752
 753         xsprintf_sys_block_path(s, "/loop/", st.st_dev);
 754         if (access(s, F_OK) < 0) {
 755                 if (errno != ENOENT)
 756                         return -errno;
 757
 758                 /* The device itself isn't a loop device, but maybe it's a partition and its parent is? */
 759                 xsprintf_sys_block_path(s, "/../loop/", st.st_dev);
 760                 if (access(s, F_OK) < 0)
 761                         return errno == ENOENT ? false : -errno;
 762         }
 763
 764         return true;
 765 }
 766
 767 static int mount_partition(
 768                 DissectedPartition *m,
 769                 const char *where,
 770                 const char *directory,
 771                 uid_t uid_shift,
 772                 DissectImageFlags flags) {
 773
 774         _cleanup_free_ char *chased = NULL, *options = NULL;
 775         const char *p, *node, *fstype;
 776         bool rw;
 777         int r;
 778
 779         assert(m);
 780         assert(where);
 781
 782         node = m->decrypted_node ?: m->node;
 783         fstype = m->decrypted_fstype ?: m->fstype;
 784
 785         if (!m->found || !node || !fstype)
 786                 return 0;
 787
 788         /* Stacked encryption? Yuck */
 789         if (streq_ptr(fstype, "crypto_LUKS"))
 790                 return -ELOOP;
 791
 792         rw = m->rw && !(flags & DISSECT_IMAGE_READ_ONLY);
 793
 794         if (directory) {
 795                 r = chase_symlinks(directory, where, CHASE_PREFIX_ROOT, &chased);
 796                 if (r < 0)
 797                         return r;
 798
 799                 p = chased;
 800         } else
 801                 p = where;
 802
 803         /* If requested, turn on discard support. */
 804         if (fstype_can_discard(fstype) &&
 805             ((flags & DISSECT_IMAGE_DISCARD) ||
 806              ((flags & DISSECT_IMAGE_DISCARD_ON_LOOP) && is_loop_device(m->node)))) {
 807                 options = strdup("discard");
 808                 if (!options)
 809                         return -ENOMEM;
 810         }
 811
 812         if (uid_is_valid(uid_shift) && uid_shift != 0 && fstype_can_uid_gid(fstype)) {
 813                 _cleanup_free_ char *uid_option = NULL;
 814
 815                 if (asprintf(&uid_option, "uid=" UID_FMT ",gid=" GID_FMT, uid_shift, (gid_t) uid_shift) < 0)
 816                         return -ENOMEM;
 817
 818                 if (!strextend_with_separator(&options, ",", uid_option, NULL))
 819                         return -ENOMEM;
 820         }
 821
 822         return mount_verbose(LOG_DEBUG, node, p, fstype, MS_NODEV|(rw ? 0 : MS_RDONLY), options);
 823 }
 824
 825 int dissected_image_mount(DissectedImage *m, const char *where, uid_t uid_shift, DissectImageFlags flags) {
 826         int r;
 827
 828         assert(m);
 829         assert(where);
 830
 831         if (!m->partitions[PARTITION_ROOT].found)
 832                 return -ENXIO;
 833
 834         if ((flags & DISSECT_IMAGE_MOUNT_NON_ROOT_ONLY) == 0) {
 835                 r = mount_partition(m->partitions + PARTITION_ROOT, where, NULL, uid_shift, flags);
 836                 if (r < 0)
 837                         return r;
 838
 839                 if (flags & DISSECT_IMAGE_VALIDATE_OS) {
 840                         r = path_is_os_tree(where);
 841                         if (r < 0)
 842                                 return r;
 843                         if (r == 0)
 844                                 return -EMEDIUMTYPE;
 845                 }
 846         }
 847
 848         if (flags & DISSECT_IMAGE_MOUNT_ROOT_ONLY)
 849                 return 0;
 850
 851         r = mount_partition(m->partitions + PARTITION_HOME, where, "/home", uid_shift, flags);
 852         if (r < 0)
 853                 return r;
 854
 855         r = mount_partition(m->partitions + PARTITION_SRV, where, "/srv", uid_shift, flags);
 856         if (r < 0)
 857                 return r;
 858
 859         if (m->partitions[PARTITION_ESP].found) {
 860                 const char *mp;
 861
 862                 /* Mount the ESP to /efi if it exists and is empty. If it doesn't exist, use /boot instead. */
 863
 864                 FOREACH_STRING(mp, "/efi", "/boot") {
 865                         _cleanup_free_ char *p = NULL;
 866
 867                         r = chase_symlinks(mp, where, CHASE_PREFIX_ROOT, &p);
 868                         if (r < 0)
 869                                 continue;
 870
 871                         r = dir_is_empty(p);
 872                         if (r > 0) {
 873                                 r = mount_partition(m->partitions + PARTITION_ESP, where, mp, uid_shift, flags);
 874                                 if (r < 0)
 875                                         return r;
 876                         }
 877                 }
 878         }
 879
 880         return 0;
 881 }
 882
 883 #if HAVE_LIBCRYPTSETUP
 884 typedef struct DecryptedPartition {
 885         struct crypt_device *device;
 886         char *name;
 887         bool relinquished;
 888 } DecryptedPartition;
 889
 890 struct DecryptedImage {
 891         DecryptedPartition *decrypted;
 892         size_t n_decrypted;
 893         size_t n_allocated;
 894 };
 895 #endif
 896
 897 DecryptedImage* decrypted_image_unref(DecryptedImage* d) {
 898 #if HAVE_LIBCRYPTSETUP
 899         size_t i;
 900         int r;
 901
 902         if (!d)
 903                 return NULL;
 904
 905         for (i = 0; i < d->n_decrypted; i++) {
 906                 DecryptedPartition *p = d->decrypted + i;
 907
 908                 if (p->device && p->name && !p->relinquished) {
 909                         r = crypt_deactivate(p->device, p->name);
 910                         if (r < 0)
 911                                 log_debug_errno(r, "Failed to deactivate encrypted partition %s", p->name);
 912                 }
 913
 914                 if (p->device)
 915                         crypt_free(p->device);
 916                 free(p->name);
 917         }
 918
 919         free(d);
 920 #endif
 921         return NULL;
 922 }
 923
 924 #if HAVE_LIBCRYPTSETUP
 925
 926 static int make_dm_name_and_node(const void *original_node, const char *suffix, char **ret_name, char **ret_node) {
 927         _cleanup_free_ char *name = NULL, *node = NULL;
 928         const char *base;
 929
 930         assert(original_node);
 931         assert(suffix);
 932         assert(ret_name);
 933         assert(ret_node);
 934
 935         base = strrchr(original_node, '/');
 936         if (!base)
 937                 return -EINVAL;
 938         base++;
 939         if (isempty(base))
 940                 return -EINVAL;
 941
 942         name = strjoin(base, suffix);
 943         if (!name)
 944                 return -ENOMEM;
 945         if (!filename_is_valid(name))
 946                 return -EINVAL;
 947
 948         node = strjoin(crypt_get_dir(), "/", name);
 949         if (!node)
 950                 return -ENOMEM;
 951
 952         *ret_name = TAKE_PTR(name);
 953         *ret_node = TAKE_PTR(node);
 954
 955         return 0;
 956 }
 957
 958 static int decrypt_partition(
 959                 DissectedPartition *m,
 960                 const char *passphrase,
 961                 DissectImageFlags flags,
 962                 DecryptedImage *d) {
 963
 964         _cleanup_free_ char *node = NULL, *name = NULL;
 965         _cleanup_(crypt_freep) struct crypt_device *cd = NULL;
 966         int r;
 967
 968         assert(m);
 969         assert(d);
 970
 971         if (!m->found || !m->node || !m->fstype)
 972                 return 0;
 973
 974         if (!streq(m->fstype, "crypto_LUKS"))
 975                 return 0;
 976
 977         if (!passphrase)
 978                 return -ENOKEY;
 979
 980         r = make_dm_name_and_node(m->node, "-decrypted", &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, m->node);
 988         if (r < 0)
 989                 return log_debug_errno(r, "Failed to initialize dm-crypt: %m");
 990
 991         r = crypt_load(cd, CRYPT_LUKS, NULL);
 992         if (r < 0)
 993                 return log_debug_errno(r, "Failed to load LUKS metadata: %m");
 994
 995         r = crypt_activate_by_passphrase(cd, name, CRYPT_ANY_SLOT, passphrase, strlen(passphrase),
 996                                          ((flags & DISSECT_IMAGE_READ_ONLY) ? CRYPT_ACTIVATE_READONLY : 0) |
 997                                          ((flags & DISSECT_IMAGE_DISCARD_ON_CRYPTO) ? CRYPT_ACTIVATE_ALLOW_DISCARDS : 0));
 998         if (r < 0) {
 999                 log_debug_errno(r, "Failed to activate LUKS device: %m");
1000                 return r == -EPERM ? -EKEYREJECTED : r;
1001         }
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
1012 static int verity_partition(
1013                 DissectedPartition *m,
1014                 DissectedPartition *v,
1015                 const void *root_hash,
1016                 size_t root_hash_size,
1017                 DissectImageFlags flags,
1018                 DecryptedImage *d) {
1019
1020         _cleanup_free_ char *node = NULL, *name = NULL;
1021         _cleanup_(crypt_freep) struct crypt_device *cd = NULL;
1022         int r;
1023
1024         assert(m);
1025         assert(v);
1026
1027         if (!root_hash)
1028                 return 0;
1029
1030         if (!m->found || !m->node || !m->fstype)
1031                 return 0;
1032         if (!v->found || !v->node || !v->fstype)
1033                 return 0;
1034
1035         if (!streq(v->fstype, "DM_verity_hash"))
1036                 return 0;
1037
1038         r = make_dm_name_and_node(m->node, "-verity", &name, &node);
1039         if (r < 0)
1040                 return r;
1041
1042         if (!GREEDY_REALLOC0(d->decrypted, d->n_allocated, d->n_decrypted + 1))
1043                 return -ENOMEM;
1044
1045         r = crypt_init(&cd, v->node);
1046         if (r < 0)
1047                 return r;
1048
1049         r = crypt_load(cd, CRYPT_VERITY, NULL);
1050         if (r < 0)
1051                 return r;
1052
1053         r = crypt_set_data_device(cd, m->node);
1054         if (r < 0)
1055                 return r;
1056
1057         r = crypt_activate_by_volume_key(cd, name, root_hash, root_hash_size, CRYPT_ACTIVATE_READONLY);
1058         if (r < 0)
1059                 return r;
1060
1061         d->decrypted[d->n_decrypted].name = TAKE_PTR(name);
1062         d->decrypted[d->n_decrypted].device = TAKE_PTR(cd);
1063         d->n_decrypted++;
1064
1065         m->decrypted_node = TAKE_PTR(node);
1066
1067         return 0;
1068 }
1069 #endif
1070
1071 int dissected_image_decrypt(
1072                 DissectedImage *m,
1073                 const char *passphrase,
1074                 const void *root_hash,
1075                 size_t root_hash_size,
1076                 DissectImageFlags flags,
1077                 DecryptedImage **ret) {
1078
1079 #if HAVE_LIBCRYPTSETUP
1080         _cleanup_(decrypted_image_unrefp) DecryptedImage *d = NULL;
1081         unsigned i;
1082         int r;
1083 #endif
1084
1085         assert(m);
1086         assert(root_hash || root_hash_size == 0);
1087
1088         /* Returns:
1089          *
1090          *      = 0           → There was nothing to decrypt
1091          *      > 0           → Decrypted successfully
1092          *      -ENOKEY       → There's something to decrypt but no key was supplied
1093          *      -EKEYREJECTED → Passed key was not correct
1094          */
1095
1096         if (root_hash && root_hash_size < sizeof(sd_id128_t))
1097                 return -EINVAL;
1098
1099         if (!m->encrypted && !m->verity) {
1100                 *ret = NULL;
1101                 return 0;
1102         }
1103
1104 #if HAVE_LIBCRYPTSETUP
1105         d = new0(DecryptedImage, 1);
1106         if (!d)
1107                 return -ENOMEM;
1108
1109         for (i = 0; i < _PARTITION_DESIGNATOR_MAX; i++) {
1110                 DissectedPartition *p = m->partitions + i;
1111                 int k;
1112
1113                 if (!p->found)
1114                         continue;
1115
1116                 r = decrypt_partition(p, passphrase, flags, d);
1117                 if (r < 0)
1118                         return r;
1119
1120                 k = PARTITION_VERITY_OF(i);
1121                 if (k >= 0) {
1122                         r = verity_partition(p, m->partitions + k, root_hash, root_hash_size, flags, d);
1123                         if (r < 0)
1124                                 return r;
1125                 }
1126
1127                 if (!p->decrypted_fstype && p->decrypted_node) {
1128                         r = probe_filesystem(p->decrypted_node, &p->decrypted_fstype);
1129                         if (r < 0 && r != -EUCLEAN)
1130                                 return r;
1131                 }
1132         }
1133
1134         *ret = TAKE_PTR(d);
1135
1136         return 1;
1137 #else
1138         return -EOPNOTSUPP;
1139 #endif
1140 }
1141
1142 int dissected_image_decrypt_interactively(
1143                 DissectedImage *m,
1144                 const char *passphrase,
1145                 const void *root_hash,
1146                 size_t root_hash_size,
1147                 DissectImageFlags flags,
1148                 DecryptedImage **ret) {
1149
1150         _cleanup_strv_free_erase_ char **z = NULL;
1151         int n = 3, r;
1152
1153         if (passphrase)
1154                 n--;
1155
1156         for (;;) {
1157                 r = dissected_image_decrypt(m, passphrase, root_hash, root_hash_size, flags, ret);
1158                 if (r >= 0)
1159                         return r;
1160                 if (r == -EKEYREJECTED)
1161                         log_error_errno(r, "Incorrect passphrase, try again!");
1162                 else if (r != -ENOKEY)
1163                         return log_error_errno(r, "Failed to decrypt image: %m");
1164
1165                 if (--n < 0)
1166                         return log_error_errno(SYNTHETIC_ERRNO(EKEYREJECTED),
1167                                                "Too many retries.");
1168
1169                 z = strv_free(z);
1170
1171                 r = ask_password_auto("Please enter image passphrase:", NULL, "dissect", "dissect", USEC_INFINITY, 0, &z);
1172                 if (r < 0)
1173                         return log_error_errno(r, "Failed to query for passphrase: %m");
1174
1175                 passphrase = z[0];
1176         }
1177 }
1178
1179 #if HAVE_LIBCRYPTSETUP
1180 static int deferred_remove(DecryptedPartition *p) {
1181         struct dm_ioctl dm = {
1182                 .version = {
1183                         DM_VERSION_MAJOR,
1184                         DM_VERSION_MINOR,
1185                         DM_VERSION_PATCHLEVEL
1186                 },
1187                 .data_size = sizeof(dm),
1188                 .flags = DM_DEFERRED_REMOVE,
1189         };
1190
1191         _cleanup_close_ int fd = -1;
1192
1193         assert(p);
1194
1195         /* Unfortunately, libcryptsetup doesn't provide a proper API for this, hence call the ioctl() directly. */
1196
1197         fd = open("/dev/mapper/control", O_RDWR|O_CLOEXEC);
1198         if (fd < 0)
1199                 return -errno;
1200
1201         if (strlen(p->name) > sizeof(dm.name))
1202                 return -ENAMETOOLONG;
1203
1204         strncpy(dm.name, p->name, sizeof(dm.name));
1205
1206         if (ioctl(fd, DM_DEV_REMOVE, &dm))
1207                 return -errno;
1208
1209         return 0;
1210 }
1211 #endif
1212
1213 int decrypted_image_relinquish(DecryptedImage *d) {
1214
1215 #if HAVE_LIBCRYPTSETUP
1216         size_t i;
1217         int r;
1218 #endif
1219
1220         assert(d);
1221
1222         /* Turns on automatic removal after the last use ended for all DM devices of this image, and sets a boolean so
1223          * that we don't clean it up ourselves either anymore */
1224
1225 #if HAVE_LIBCRYPTSETUP
1226         for (i = 0; i < d->n_decrypted; i++) {
1227                 DecryptedPartition *p = d->decrypted + i;
1228
1229                 if (p->relinquished)
1230                         continue;
1231
1232                 r = deferred_remove(p);
1233                 if (r < 0)
1234                         return log_debug_errno(r, "Failed to mark %s for auto-removal: %m", p->name);
1235
1236                 p->relinquished = true;
1237         }
1238 #endif
1239
1240         return 0;
1241 }
1242
1243 int root_hash_load(const char *image, void **ret, size_t *ret_size) {
1244         _cleanup_free_ char *text = NULL;
1245         _cleanup_free_ void *k = NULL;
1246         size_t l;
1247         int r;
1248
1249         assert(image);
1250         assert(ret);
1251         assert(ret_size);
1252
1253         if (is_device_path(image)) {
1254                 /* If we are asked to load the root hash for a device node, exit early */
1255                 *ret = NULL;
1256                 *ret_size = 0;
1257                 return 0;
1258         }
1259
1260         r = getxattr_malloc(image, "user.verity.roothash", &text, true);
1261         if (r < 0) {
1262                 char *fn, *e, *n;
1263
1264                 if (!IN_SET(r, -ENODATA, -EOPNOTSUPP, -ENOENT))
1265                         return r;
1266
1267                 fn = newa(char, strlen(image) + STRLEN(".roothash") + 1);
1268                 n = stpcpy(fn, image);
1269                 e = endswith(fn, ".raw");
1270                 if (e)
1271                         n = e;
1272
1273                 strcpy(n, ".roothash");
1274
1275                 r = read_one_line_file(fn, &text);
1276                 if (r == -ENOENT) {
1277                         *ret = NULL;
1278                         *ret_size = 0;
1279                         return 0;
1280                 }
1281                 if (r < 0)
1282                         return r;
1283         }
1284
1285         r = unhexmem(text, strlen(text), &k, &l);
1286         if (r < 0)
1287                 return r;
1288         if (l < sizeof(sd_id128_t))
1289                 return -EINVAL;
1290
1291         *ret = TAKE_PTR(k);
1292         *ret_size = l;
1293
1294         return 1;
1295 }
1296
1297 int dissected_image_acquire_metadata(DissectedImage *m) {
1298
1299         enum {
1300                 META_HOSTNAME,
1301                 META_MACHINE_ID,
1302                 META_MACHINE_INFO,
1303                 META_OS_RELEASE,
1304                 _META_MAX,
1305         };
1306
1307         static const char *const paths[_META_MAX] = {
1308                 [META_HOSTNAME]     = "/etc/hostname\0",
1309                 [META_MACHINE_ID]   = "/etc/machine-id\0",
1310                 [META_MACHINE_INFO] = "/etc/machine-info\0",
1311                 [META_OS_RELEASE]   = "/etc/os-release\0/usr/lib/os-release\0",
1312         };
1313
1314         _cleanup_strv_free_ char **machine_info = NULL, **os_release = NULL;
1315         _cleanup_(rmdir_and_freep) char *t = NULL;
1316         _cleanup_(sigkill_waitp) pid_t child = 0;
1317         sd_id128_t machine_id = SD_ID128_NULL;
1318         _cleanup_free_ char *hostname = NULL;
1319         unsigned n_meta_initialized = 0, k;
1320         int fds[2 * _META_MAX], r;
1321
1322         BLOCK_SIGNALS(SIGCHLD);
1323
1324         assert(m);
1325
1326         for (; n_meta_initialized < _META_MAX; n_meta_initialized ++)
1327                 if (pipe2(fds + 2*n_meta_initialized, O_CLOEXEC) < 0) {
1328                         r = -errno;
1329                         goto finish;
1330                 }
1331
1332         r = mkdtemp_malloc("/tmp/dissect-XXXXXX", &t);
1333         if (r < 0)
1334                 goto finish;
1335
1336         r = safe_fork("(sd-dissect)", FORK_RESET_SIGNALS|FORK_DEATHSIG|FORK_NEW_MOUNTNS|FORK_MOUNTNS_SLAVE, &child);
1337         if (r < 0)
1338                 goto finish;
1339         if (r == 0) {
1340                 r = dissected_image_mount(m, t, UID_INVALID, DISSECT_IMAGE_READ_ONLY|DISSECT_IMAGE_MOUNT_ROOT_ONLY|DISSECT_IMAGE_VALIDATE_OS);
1341                 if (r < 0) {
1342                         log_debug_errno(r, "Failed to mount dissected image: %m");
1343                         _exit(EXIT_FAILURE);
1344                 }
1345
1346                 for (k = 0; k < _META_MAX; k++) {
1347                         _cleanup_close_ int fd = -1;
1348                         const char *p;
1349
1350                         fds[2*k] = safe_close(fds[2*k]);
1351
1352                         NULSTR_FOREACH(p, paths[k]) {
1353                                 fd = chase_symlinks_and_open(p, t, CHASE_PREFIX_ROOT, O_RDONLY|O_CLOEXEC|O_NOCTTY, NULL);
1354                                 if (fd >= 0)
1355                                         break;
1356                         }
1357                         if (fd < 0) {
1358                                 log_debug_errno(fd, "Failed to read %s file of image, ignoring: %m", paths[k]);
1359                                 continue;
1360                         }
1361
1362                         r = copy_bytes(fd, fds[2*k+1], (uint64_t) -1, 0);
1363                         if (r < 0)
1364                                 _exit(EXIT_FAILURE);
1365
1366                         fds[2*k+1] = safe_close(fds[2*k+1]);
1367                 }
1368
1369                 _exit(EXIT_SUCCESS);
1370         }
1371
1372         for (k = 0; k < _META_MAX; k++) {
1373                 _cleanup_fclose_ FILE *f = NULL;
1374
1375                 fds[2*k+1] = safe_close(fds[2*k+1]);
1376
1377                 f = fdopen(fds[2*k], "r");
1378                 if (!f) {
1379                         r = -errno;
1380                         goto finish;
1381                 }
1382
1383                 fds[2*k] = -1;
1384
1385                 switch (k) {
1386
1387                 case META_HOSTNAME:
1388                         r = read_etc_hostname_stream(f, &hostname);
1389                         if (r < 0)
1390                                 log_debug_errno(r, "Failed to read /etc/hostname: %m");
1391
1392                         break;
1393
1394                 case META_MACHINE_ID: {
1395                         _cleanup_free_ char *line = NULL;
1396
1397                         r = read_line(f, LONG_LINE_MAX, &line);
1398                         if (r < 0)
1399                                 log_debug_errno(r, "Failed to read /etc/machine-id: %m");
1400                         else if (r == 33) {
1401                                 r = sd_id128_from_string(line, &machine_id);
1402                                 if (r < 0)
1403                                         log_debug_errno(r, "Image contains invalid /etc/machine-id: %s", line);
1404                         } else if (r == 0)
1405                                 log_debug("/etc/machine-id file is empty.");
1406                         else
1407                                 log_debug("/etc/machine-id has unexpected length %i.", r);
1408
1409                         break;
1410                 }
1411
1412                 case META_MACHINE_INFO:
1413                         r = load_env_file_pairs(f, "machine-info", &machine_info);
1414                         if (r < 0)
1415                                 log_debug_errno(r, "Failed to read /etc/machine-info: %m");
1416
1417                         break;
1418
1419                 case META_OS_RELEASE:
1420                         r = load_env_file_pairs(f, "os-release", &os_release);
1421                         if (r < 0)
1422                                 log_debug_errno(r, "Failed to read OS release file: %m");
1423
1424                         break;
1425                 }
1426         }
1427
1428         r = wait_for_terminate_and_check("(sd-dissect)", child, 0);
1429         child = 0;
1430         if (r < 0)
1431                 goto finish;
1432         if (r != EXIT_SUCCESS)
1433                 return -EPROTO;
1434
1435         free_and_replace(m->hostname, hostname);
1436         m->machine_id = machine_id;
1437         strv_free_and_replace(m->machine_info, machine_info);
1438         strv_free_and_replace(m->os_release, os_release);
1439
1440 finish:
1441         for (k = 0; k < n_meta_initialized; k++)
1442                 safe_close_pair(fds + 2*k);
1443
1444         return r;
1445 }
1446
1447 int dissect_image_and_warn(
1448                 int fd,
1449                 const char *name,
1450                 const void *root_hash,
1451                 size_t root_hash_size,
1452                 DissectImageFlags flags,
1453                 DissectedImage **ret) {
1454
1455         _cleanup_free_ char *buffer = NULL;
1456         int r;
1457
1458         if (!name) {
1459                 r = fd_get_path(fd, &buffer);
1460                 if (r < 0)
1461                         return r;
1462
1463                 name = buffer;
1464         }
1465
1466         r = dissect_image(fd, root_hash, root_hash_size, flags, ret);
1467
1468         switch (r) {
1469
1470         case -EOPNOTSUPP:
1471                 return log_error_errno(r, "Dissecting images is not supported, compiled without blkid support.");
1472
1473         case -ENOPKG:
1474                 return log_error_errno(r, "Couldn't identify a suitable partition table or file system in '%s'.", name);
1475
1476         case -EADDRNOTAVAIL:
1477                 return log_error_errno(r, "No root partition for specified root hash found in '%s'.", name);
1478
1479         case -ENOTUNIQ:
1480                 return log_error_errno(r, "Multiple suitable root partitions found in image '%s'.", name);
1481
1482         case -ENXIO:
1483                 return log_error_errno(r, "No suitable root partition found in image '%s'.", name);
1484
1485         case -EPROTONOSUPPORT:
1486                 return log_error_errno(r, "Device '%s' is loopback block device with partition scanning turned off, please turn it on.", name);
1487
1488         default:
1489                 if (r < 0)
1490                         return log_error_errno(r, "Failed to dissect image '%s': %m", name);
1491
1492                 return r;
1493         }
1494 }
1495
1496 static const char *const partition_designator_table[] = {
1497         [PARTITION_ROOT] = "root",
1498         [PARTITION_ROOT_SECONDARY] = "root-secondary",
1499         [PARTITION_HOME] = "home",
1500         [PARTITION_SRV] = "srv",
1501         [PARTITION_ESP] = "esp",
1502         [PARTITION_SWAP] = "swap",
1503         [PARTITION_ROOT_VERITY] = "root-verity",
1504         [PARTITION_ROOT_SECONDARY_VERITY] = "root-secondary-verity",
1505 };
1506
1507 DEFINE_STRING_TABLE_LOOKUP(partition_designator, int);