src/shared/dissect-image.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /***
   3   This file is part of systemd.
   4
   5   Copyright 2016 Lennart Poettering
   6 ***/
   7
   8 #include <sys/mount.h>
   9 #include <sys/prctl.h>
  10 #include <sys/wait.h>
  11
  12 #include "sd-id128.h"
  13
  14 #include "architecture.h"
  15 #include "ask-password-api.h"
  16 #include "blkid-util.h"
  17 #include "blockdev-util.h"
  18 #include "copy.h"
  19 #include "crypt-util.h"
  20 #include "def.h"
  21 #include "device-nodes.h"
  22 #include "dissect-image.h"
  23 #include "fd-util.h"
  24 #include "fileio.h"
  25 #include "fs-util.h"
  26 #include "gpt.h"
  27 #include "hexdecoct.h"
  28 #include "hostname-util.h"
  29 #include "id128-util.h"
  30 #include "linux-3.13/dm-ioctl.h"
  31 #include "missing.h"
  32 #include "mount-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 "udev-util.h"
  43 #include "user-util.h"
  44 #include "xattr-util.h"
  45
  46 int probe_filesystem(const char *node, char **ret_fstype) {
  47         /* Try to find device content type and return it in *ret_fstype. If nothing is found,
  48          * 0/NULL will be returned. -EUCLEAN will be returned for ambigous results, and an
  49          * different error otherwise. */
  50
  51 #if HAVE_BLKID
  52         _cleanup_blkid_free_probe_ blkid_probe b = NULL;
  53         const char *fstype;
  54         int r;
  55
  56         errno = 0;
  57         b = blkid_new_probe_from_filename(node);
  58         if (!b)
  59                 return -errno ?: -ENOMEM;
  60
  61         blkid_probe_enable_superblocks(b, 1);
  62         blkid_probe_set_superblocks_flags(b, BLKID_SUBLKS_TYPE);
  63
  64         errno = 0;
  65         r = blkid_do_safeprobe(b);
  66         if (r == 1) {
  67                 log_debug("No type detected on partition %s", node);
  68                 goto not_found;
  69         }
  70         if (r == -2) {
  71                 log_debug("Results ambiguous for partition %s", node);
  72                 return -EUCLEAN;
  73         }
  74         if (r != 0)
  75                 return -errno ?: -EIO;
  76
  77         (void) blkid_probe_lookup_value(b, "TYPE", &fstype, NULL);
  78
  79         if (fstype) {
  80                 char *t;
  81
  82                 t = strdup(fstype);
  83                 if (!t)
  84                         return -ENOMEM;
  85
  86                 *ret_fstype = t;
  87                 return 1;
  88         }
  89
  90 not_found:
  91         *ret_fstype = NULL;
  92         return 0;
  93 #else
  94         return -EOPNOTSUPP;
  95 #endif
  96 }
  97
  98 /* Detect RPMB and Boot partitions, which are not listed by blkid.
  99  * See https://github.com/systemd/systemd/issues/5806. */
 100 static bool device_is_mmc_special_partition(struct udev_device *d) {
 101         const char *sysname;
 102
 103         sysname = udev_device_get_sysname(d);
 104         return sysname && startswith(sysname, "mmcblk") &&
 105                 (endswith(sysname, "rpmb") || endswith(sysname, "boot0") || endswith(sysname, "boot1"));
 106 }
 107
 108 static bool device_is_block(struct udev_device *d) {
 109         const char *ss;
 110
 111         ss = udev_device_get_subsystem(d);
 112         if (!ss)
 113                 return false;
 114
 115         return streq(ss, "block");
 116 }
 117
 118 int dissect_image(
 119                 int fd,
 120                 const void *root_hash,
 121                 size_t root_hash_size,
 122                 DissectImageFlags flags,
 123                 DissectedImage **ret) {
 124
 125 #if HAVE_BLKID
 126         sd_id128_t root_uuid = SD_ID128_NULL, verity_uuid = SD_ID128_NULL;
 127         _cleanup_udev_enumerate_unref_ struct udev_enumerate *e = NULL;
 128         bool is_gpt, is_mbr, generic_rw, multiple_generic = false;
 129         _cleanup_udev_device_unref_ struct udev_device *d = NULL;
 130         _cleanup_(dissected_image_unrefp) DissectedImage *m = NULL;
 131         _cleanup_blkid_free_probe_ blkid_probe b = NULL;
 132         _cleanup_udev_unref_ struct udev *udev = NULL;
 133         _cleanup_free_ char *generic_node = NULL;
 134         sd_id128_t generic_uuid = SD_ID128_NULL;
 135         const char *pttype = NULL;
 136         struct udev_list_entry *first, *item;
 137         blkid_partlist pl;
 138         int r, generic_nr;
 139         struct stat st;
 140         unsigned i;
 141
 142         assert(fd >= 0);
 143         assert(ret);
 144         assert(root_hash || root_hash_size == 0);
 145
 146         /* Probes a disk image, and returns information about what it found in *ret.
 147          *
 148          * Returns -ENOPKG if no suitable partition table or file system could be found.
 149          * Returns -EADDRNOTAVAIL if a root hash was specified but no matching root/verity partitions found. */
 150
 151         if (root_hash) {
 152                 /* If a root hash is supplied, then we use the root partition that has a UUID that match the first
 153                  * 128bit of the root hash. And we use the verity partition that has a UUID that match the final
 154                  * 128bit. */
 155
 156                 if (root_hash_size < sizeof(sd_id128_t))
 157                         return -EINVAL;
 158
 159                 memcpy(&root_uuid, root_hash, sizeof(sd_id128_t));
 160                 memcpy(&verity_uuid, (const uint8_t*) root_hash + root_hash_size - sizeof(sd_id128_t), sizeof(sd_id128_t));
 161
 162                 if (sd_id128_is_null(root_uuid))
 163                         return -EINVAL;
 164                 if (sd_id128_is_null(verity_uuid))
 165                         return -EINVAL;
 166         }
 167
 168         if (fstat(fd, &st) < 0)
 169                 return -errno;
 170
 171         if (!S_ISBLK(st.st_mode))
 172                 return -ENOTBLK;
 173
 174         b = blkid_new_probe();
 175         if (!b)
 176                 return -ENOMEM;
 177
 178         errno = 0;
 179         r = blkid_probe_set_device(b, fd, 0, 0);
 180         if (r != 0)
 181                 return -errno ?: -ENOMEM;
 182
 183         if ((flags & DISSECT_IMAGE_GPT_ONLY) == 0) {
 184                 /* Look for file system superblocks, unless we only shall look for GPT partition tables */
 185                 blkid_probe_enable_superblocks(b, 1);
 186                 blkid_probe_set_superblocks_flags(b, BLKID_SUBLKS_TYPE|BLKID_SUBLKS_USAGE);
 187         }
 188
 189         blkid_probe_enable_partitions(b, 1);
 190         blkid_probe_set_partitions_flags(b, BLKID_PARTS_ENTRY_DETAILS);
 191
 192         errno = 0;
 193         r = blkid_do_safeprobe(b);
 194         if (IN_SET(r, -2, 1)) {
 195                 log_debug("Failed to identify any partition table.");
 196                 return -ENOPKG;
 197         }
 198         if (r != 0)
 199                 return -errno ?: -EIO;
 200
 201         m = new0(DissectedImage, 1);
 202         if (!m)
 203                 return -ENOMEM;
 204
 205         if (!(flags & DISSECT_IMAGE_GPT_ONLY) &&
 206             (flags & DISSECT_IMAGE_REQUIRE_ROOT)) {
 207                 const char *usage = NULL;
 208
 209                 (void) blkid_probe_lookup_value(b, "USAGE", &usage, NULL);
 210                 if (STRPTR_IN_SET(usage, "filesystem", "crypto")) {
 211                         _cleanup_free_ char *t = NULL, *n = NULL;
 212                         const char *fstype = NULL;
 213
 214                         /* OK, we have found a file system, that's our root partition then. */
 215                         (void) blkid_probe_lookup_value(b, "TYPE", &fstype, NULL);
 216
 217                         if (fstype) {
 218                                 t = strdup(fstype);
 219                                 if (!t)
 220                                         return -ENOMEM;
 221                         }
 222
 223                         if (asprintf(&n, "/dev/block/%u:%u", major(st.st_rdev), minor(st.st_rdev)) < 0)
 224                                 return -ENOMEM;
 225
 226                         m->partitions[PARTITION_ROOT] = (DissectedPartition) {
 227                                 .found = true,
 228                                 .rw = true,
 229                                 .partno = -1,
 230                                 .architecture = _ARCHITECTURE_INVALID,
 231                                 .fstype = TAKE_PTR(t),
 232                                 .node = TAKE_PTR(n),
 233                         };
 234
 235                         m->encrypted = streq(fstype, "crypto_LUKS");
 236
 237                         *ret = TAKE_PTR(m);
 238
 239                         return 0;
 240                 }
 241         }
 242
 243         (void) blkid_probe_lookup_value(b, "PTTYPE", &pttype, NULL);
 244         if (!pttype)
 245                 return -ENOPKG;
 246
 247         is_gpt = streq_ptr(pttype, "gpt");
 248         is_mbr = streq_ptr(pttype, "dos");
 249
 250         if (!is_gpt && ((flags & DISSECT_IMAGE_GPT_ONLY) || !is_mbr))
 251                 return -ENOPKG;
 252
 253         errno = 0;
 254         pl = blkid_probe_get_partitions(b);
 255         if (!pl)
 256                 return -errno ?: -ENOMEM;
 257
 258         udev = udev_new();
 259         if (!udev)
 260                 return -errno;
 261
 262         d = udev_device_new_from_devnum(udev, 'b', st.st_rdev);
 263         if (!d)
 264                 return -ENOMEM;
 265
 266         for (i = 0;; i++) {
 267                 int n, z;
 268
 269                 if (i >= 10) {
 270                         log_debug("Kernel partitions never appeared.");
 271                         return -ENXIO;
 272                 }
 273
 274                 e = udev_enumerate_new(udev);
 275                 if (!e)
 276                         return -errno;
 277
 278                 r = udev_enumerate_add_match_parent(e, d);
 279                 if (r < 0)
 280                         return r;
 281
 282                 r = udev_enumerate_scan_devices(e);
 283                 if (r < 0)
 284                         return r;
 285
 286                 /* Count the partitions enumerated by the kernel */
 287                 n = 0;
 288                 first = udev_enumerate_get_list_entry(e);
 289                 udev_list_entry_foreach(item, first) {
 290                         _cleanup_udev_device_unref_ struct udev_device *q;
 291                         dev_t qn;
 292
 293                         q = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item));
 294                         if (!q)
 295                                 return -errno;
 296
 297                         qn = udev_device_get_devnum(q);
 298                         if (major(qn) == 0)
 299                                 continue;
 300
 301                         if (!device_is_block(q))
 302                                 continue;
 303
 304                         if (device_is_mmc_special_partition(q))
 305                                 continue;
 306                         n++;
 307                 }
 308
 309                 /* Count the partitions enumerated by blkid */
 310                 z = blkid_partlist_numof_partitions(pl);
 311                 if (n == z + 1)
 312                         break;
 313                 if (n > z + 1) {
 314                         log_debug("blkid and kernel partition list do not match.");
 315                         return -EIO;
 316                 }
 317                 if (n < z + 1) {
 318                         unsigned j = 0;
 319
 320                         /* The kernel has probed fewer partitions than blkid? Maybe the kernel prober is still running
 321                          * or it got EBUSY because udev already opened the device. Let's reprobe the device, which is a
 322                          * synchronous call that waits until probing is complete. */
 323
 324                         for (;;) {
 325                                 if (j++ > 20)
 326                                         return -EBUSY;
 327
 328                                 if (ioctl(fd, BLKRRPART, 0) < 0) {
 329                                         r = -errno;
 330
 331                                         if (r == -EINVAL) {
 332                                                 struct loop_info64 info;
 333
 334                                                 /* If we are running on a loop device that has partition scanning off,
 335                                                  * return an explicit recognizable error about this, so that callers
 336                                                  * can generate a proper message explaining the situation. */
 337
 338                                                 if (ioctl(fd, LOOP_GET_STATUS64, &info) >= 0 && (info.lo_flags & LO_FLAGS_PARTSCAN) == 0) {
 339                                                         log_debug("Device is loop device and partition scanning is off!");
 340                                                         return -EPROTONOSUPPORT;
 341                                                 }
 342                                         }
 343                                         if (r != -EBUSY)
 344                                                 return r;
 345                                 } else
 346                                         break;
 347
 348                                 /* If something else has the device open, such as an udev rule, the ioctl will return
 349                                  * EBUSY. Since there's no way to wait until it isn't busy anymore, let's just wait a
 350                                  * bit, and try again.
 351                                  *
 352                                  * This is really something they should fix in the kernel! */
 353
 354                                 (void) usleep(50 * USEC_PER_MSEC);
 355                         }
 356                 }
 357
 358                 e = udev_enumerate_unref(e);
 359         }
 360
 361         first = udev_enumerate_get_list_entry(e);
 362         udev_list_entry_foreach(item, first) {
 363                 _cleanup_udev_device_unref_ struct udev_device *q;
 364                 unsigned long long pflags;
 365                 blkid_partition pp;
 366                 const char *node;
 367                 dev_t qn;
 368                 int nr;
 369
 370                 q = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item));
 371                 if (!q)
 372                         return -errno;
 373
 374                 qn = udev_device_get_devnum(q);
 375                 if (major(qn) == 0)
 376                         continue;
 377
 378                 if (st.st_rdev == qn)
 379                         continue;
 380
 381                 if (!device_is_block(q))
 382                         continue;
 383
 384                 if (device_is_mmc_special_partition(q))
 385                         continue;
 386
 387                 node = udev_device_get_devnode(q);
 388                 if (!node)
 389                         continue;
 390
 391                 pp = blkid_partlist_devno_to_partition(pl, qn);
 392                 if (!pp)
 393                         continue;
 394
 395                 pflags = blkid_partition_get_flags(pp);
 396
 397                 nr = blkid_partition_get_partno(pp);
 398                 if (nr < 0)
 399                         continue;
 400
 401                 if (is_gpt) {
 402                         int designator = _PARTITION_DESIGNATOR_INVALID, architecture = _ARCHITECTURE_INVALID;
 403                         const char *stype, *sid, *fstype = NULL;
 404                         sd_id128_t type_id, id;
 405                         bool rw = true;
 406
 407                         sid = blkid_partition_get_uuid(pp);
 408                         if (!sid)
 409                                 continue;
 410                         if (sd_id128_from_string(sid, &id) < 0)
 411                                 continue;
 412
 413                         stype = blkid_partition_get_type_string(pp);
 414                         if (!stype)
 415                                 continue;
 416                         if (sd_id128_from_string(stype, &type_id) < 0)
 417                                 continue;
 418
 419                         if (sd_id128_equal(type_id, GPT_HOME)) {
 420
 421                                 if (pflags & GPT_FLAG_NO_AUTO)
 422                                         continue;
 423
 424                                 designator = PARTITION_HOME;
 425                                 rw = !(pflags & GPT_FLAG_READ_ONLY);
 426                         } else if (sd_id128_equal(type_id, GPT_SRV)) {
 427
 428                                 if (pflags & GPT_FLAG_NO_AUTO)
 429                                         continue;
 430
 431                                 designator = PARTITION_SRV;
 432                                 rw = !(pflags & GPT_FLAG_READ_ONLY);
 433                         } else if (sd_id128_equal(type_id, GPT_ESP)) {
 434
 435                                 /* Note that we don't check the GPT_FLAG_NO_AUTO flag for the ESP, as it is not defined
 436                                  * there. We instead check the GPT_FLAG_NO_BLOCK_IO_PROTOCOL, as recommended by the
 437                                  * UEFI spec (See "12.3.3 Number and Location of System Partitions"). */
 438
 439                                 if (pflags & GPT_FLAG_NO_BLOCK_IO_PROTOCOL)
 440                                         continue;
 441
 442                                 designator = PARTITION_ESP;
 443                                 fstype = "vfat";
 444                         }
 445 #ifdef GPT_ROOT_NATIVE
 446                         else if (sd_id128_equal(type_id, GPT_ROOT_NATIVE)) {
 447
 448                                 if (pflags & GPT_FLAG_NO_AUTO)
 449                                         continue;
 450
 451                                 /* If a root ID is specified, ignore everything but the root id */
 452                                 if (!sd_id128_is_null(root_uuid) && !sd_id128_equal(root_uuid, id))
 453                                         continue;
 454
 455                                 designator = PARTITION_ROOT;
 456                                 architecture = native_architecture();
 457                                 rw = !(pflags & GPT_FLAG_READ_ONLY);
 458                         } else if (sd_id128_equal(type_id, GPT_ROOT_NATIVE_VERITY)) {
 459
 460                                 if (pflags & GPT_FLAG_NO_AUTO)
 461                                         continue;
 462
 463                                 m->can_verity = true;
 464
 465                                 /* Ignore verity unless a root hash is specified */
 466                                 if (sd_id128_is_null(verity_uuid) || !sd_id128_equal(verity_uuid, id))
 467                                         continue;
 468
 469                                 designator = PARTITION_ROOT_VERITY;
 470                                 fstype = "DM_verity_hash";
 471                                 architecture = native_architecture();
 472                                 rw = false;
 473                         }
 474 #endif
 475 #ifdef GPT_ROOT_SECONDARY
 476                         else if (sd_id128_equal(type_id, GPT_ROOT_SECONDARY)) {
 477
 478                                 if (pflags & GPT_FLAG_NO_AUTO)
 479                                         continue;
 480
 481                                 /* If a root ID is specified, ignore everything but the root id */
 482                                 if (!sd_id128_is_null(root_uuid) && !sd_id128_equal(root_uuid, id))
 483                                         continue;
 484
 485                                 designator = PARTITION_ROOT_SECONDARY;
 486                                 architecture = SECONDARY_ARCHITECTURE;
 487                                 rw = !(pflags & GPT_FLAG_READ_ONLY);
 488                         } else if (sd_id128_equal(type_id, GPT_ROOT_SECONDARY_VERITY)) {
 489
 490                                 if (pflags & GPT_FLAG_NO_AUTO)
 491                                         continue;
 492
 493                                 m->can_verity = true;
 494
 495                                 /* Ignore verity unless root has is specified */
 496                                 if (sd_id128_is_null(verity_uuid) || !sd_id128_equal(verity_uuid, id))
 497                                         continue;
 498
 499                                 designator = PARTITION_ROOT_SECONDARY_VERITY;
 500                                 fstype = "DM_verity_hash";
 501                                 architecture = SECONDARY_ARCHITECTURE;
 502                                 rw = false;
 503                         }
 504 #endif
 505                         else if (sd_id128_equal(type_id, GPT_SWAP)) {
 506
 507                                 if (pflags & GPT_FLAG_NO_AUTO)
 508                                         continue;
 509
 510                                 designator = PARTITION_SWAP;
 511                                 fstype = "swap";
 512                         } else if (sd_id128_equal(type_id, GPT_LINUX_GENERIC)) {
 513
 514                                 if (pflags & GPT_FLAG_NO_AUTO)
 515                                         continue;
 516
 517                                 if (generic_node)
 518                                         multiple_generic = true;
 519                                 else {
 520                                         generic_nr = nr;
 521                                         generic_rw = !(pflags & GPT_FLAG_READ_ONLY);
 522                                         generic_uuid = id;
 523                                         generic_node = strdup(node);
 524                                         if (!generic_node)
 525                                                 return -ENOMEM;
 526                                 }
 527                         }
 528
 529                         if (designator != _PARTITION_DESIGNATOR_INVALID) {
 530                                 _cleanup_free_ char *t = NULL, *n = NULL;
 531
 532                                 /* First one wins */
 533                                 if (m->partitions[designator].found)
 534                                         continue;
 535
 536                                 if (fstype) {
 537                                         t = strdup(fstype);
 538                                         if (!t)
 539                                                 return -ENOMEM;
 540                                 }
 541
 542                                 n = strdup(node);
 543                                 if (!n)
 544                                         return -ENOMEM;
 545
 546                                 m->partitions[designator] = (DissectedPartition) {
 547                                         .found = true,
 548                                         .partno = nr,
 549                                         .rw = rw,
 550                                         .architecture = architecture,
 551                                         .node = TAKE_PTR(n),
 552                                         .fstype = TAKE_PTR(t),
 553                                         .uuid = id,
 554                                 };
 555                         }
 556
 557                 } else if (is_mbr) {
 558
 559                         if (pflags != 0x80) /* Bootable flag */
 560                                 continue;
 561
 562                         if (blkid_partition_get_type(pp) != 0x83) /* Linux partition */
 563                                 continue;
 564
 565                         if (generic_node)
 566                                 multiple_generic = true;
 567                         else {
 568                                 generic_nr = nr;
 569                                 generic_rw = true;
 570                                 generic_node = strdup(node);
 571                                 if (!generic_node)
 572                                         return -ENOMEM;
 573                         }
 574                 }
 575         }
 576
 577         if (!m->partitions[PARTITION_ROOT].found) {
 578                 /* No root partition found? Then let's see if ther's one for the secondary architecture. And if not
 579                  * either, then check if there's a single generic one, and use that. */
 580
 581                 if (m->partitions[PARTITION_ROOT_VERITY].found)
 582                         return -EADDRNOTAVAIL;
 583
 584                 if (m->partitions[PARTITION_ROOT_SECONDARY].found) {
 585                         m->partitions[PARTITION_ROOT] = m->partitions[PARTITION_ROOT_SECONDARY];
 586                         zero(m->partitions[PARTITION_ROOT_SECONDARY]);
 587
 588                         m->partitions[PARTITION_ROOT_VERITY] = m->partitions[PARTITION_ROOT_SECONDARY_VERITY];
 589                         zero(m->partitions[PARTITION_ROOT_SECONDARY_VERITY]);
 590
 591                 } else if (flags & DISSECT_IMAGE_REQUIRE_ROOT) {
 592
 593                         /* If the root has was set, then we won't fallback to a generic node, because the root hash
 594                          * decides */
 595                         if (root_hash)
 596                                 return -EADDRNOTAVAIL;
 597
 598                         /* If we didn't find a generic node, then we can't fix this up either */
 599                         if (!generic_node)
 600                                 return -ENXIO;
 601
 602                         /* If we didn't find a properly marked root partition, but we did find a single suitable
 603                          * generic Linux partition, then use this as root partition, if the caller asked for it. */
 604                         if (multiple_generic)
 605                                 return -ENOTUNIQ;
 606
 607                         m->partitions[PARTITION_ROOT] = (DissectedPartition) {
 608                                 .found = true,
 609                                 .rw = generic_rw,
 610                                 .partno = generic_nr,
 611                                 .architecture = _ARCHITECTURE_INVALID,
 612                                 .node = TAKE_PTR(generic_node),
 613                                 .uuid = generic_uuid,
 614                         };
 615                 }
 616         }
 617
 618         if (root_hash) {
 619                 if (!m->partitions[PARTITION_ROOT_VERITY].found || !m->partitions[PARTITION_ROOT].found)
 620                         return -EADDRNOTAVAIL;
 621
 622                 /* If we found the primary root with the hash, then we definitely want to suppress any secondary root
 623                  * (which would be weird, after all the root hash should only be assigned to one pair of
 624                  * partitions... */
 625                 m->partitions[PARTITION_ROOT_SECONDARY].found = false;
 626                 m->partitions[PARTITION_ROOT_SECONDARY_VERITY].found = false;
 627
 628                 /* If we found a verity setup, then the root partition is necessarily read-only. */
 629                 m->partitions[PARTITION_ROOT].rw = false;
 630
 631                 m->verity = true;
 632         }
 633
 634         blkid_free_probe(b);
 635         b = NULL;
 636
 637         /* Fill in file system types if we don't know them yet. */
 638         for (i = 0; i < _PARTITION_DESIGNATOR_MAX; i++) {
 639                 DissectedPartition *p = m->partitions + i;
 640
 641                 if (!p->found)
 642                         continue;
 643
 644                 if (!p->fstype && p->node) {
 645                         r = probe_filesystem(p->node, &p->fstype);
 646                         if (r < 0 && r != -EUCLEAN)
 647                                 return r;
 648                 }
 649
 650                 if (streq_ptr(p->fstype, "crypto_LUKS"))
 651                         m->encrypted = true;
 652
 653                 if (p->fstype && fstype_is_ro(p->fstype))
 654                         p->rw = false;
 655         }
 656
 657         *ret = TAKE_PTR(m);
 658
 659         return 0;
 660 #else
 661         return -EOPNOTSUPP;
 662 #endif
 663 }
 664
 665 DissectedImage* dissected_image_unref(DissectedImage *m) {
 666         unsigned i;
 667
 668         if (!m)
 669                 return NULL;
 670
 671         for (i = 0; i < _PARTITION_DESIGNATOR_MAX; i++) {
 672                 free(m->partitions[i].fstype);
 673                 free(m->partitions[i].node);
 674                 free(m->partitions[i].decrypted_fstype);
 675                 free(m->partitions[i].decrypted_node);
 676         }
 677
 678         free(m->hostname);
 679         strv_free(m->machine_info);
 680         strv_free(m->os_release);
 681
 682         return mfree(m);
 683 }
 684
 685 static int is_loop_device(const char *path) {
 686         char s[SYS_BLOCK_PATH_MAX("/../loop/")];
 687         struct stat st;
 688
 689         assert(path);
 690
 691         if (stat(path, &st) < 0)
 692                 return -errno;
 693
 694         if (!S_ISBLK(st.st_mode))
 695                 return -ENOTBLK;
 696
 697         xsprintf_sys_block_path(s, "/loop/", st.st_dev);
 698         if (access(s, F_OK) < 0) {
 699                 if (errno != ENOENT)
 700                         return -errno;
 701
 702                 /* The device itself isn't a loop device, but maybe it's a partition and its parent is? */
 703                 xsprintf_sys_block_path(s, "/../loop/", st.st_dev);
 704                 if (access(s, F_OK) < 0)
 705                         return errno == ENOENT ? false : -errno;
 706         }
 707
 708         return true;
 709 }
 710
 711 static int mount_partition(
 712                 DissectedPartition *m,
 713                 const char *where,
 714                 const char *directory,
 715                 uid_t uid_shift,
 716                 DissectImageFlags flags) {
 717
 718         _cleanup_free_ char *chased = NULL, *options = NULL;
 719         const char *p, *node, *fstype;
 720         bool rw;
 721         int r;
 722
 723         assert(m);
 724         assert(where);
 725
 726         node = m->decrypted_node ?: m->node;
 727         fstype = m->decrypted_fstype ?: m->fstype;
 728
 729         if (!m->found || !node || !fstype)
 730                 return 0;
 731
 732         /* Stacked encryption? Yuck */
 733         if (streq_ptr(fstype, "crypto_LUKS"))
 734                 return -ELOOP;
 735
 736         rw = m->rw && !(flags & DISSECT_IMAGE_READ_ONLY);
 737
 738         if (directory) {
 739                 r = chase_symlinks(directory, where, CHASE_PREFIX_ROOT, &chased);
 740                 if (r < 0)
 741                         return r;
 742
 743                 p = chased;
 744         } else
 745                 p = where;
 746
 747         /* If requested, turn on discard support. */
 748         if (fstype_can_discard(fstype) &&
 749             ((flags & DISSECT_IMAGE_DISCARD) ||
 750              ((flags & DISSECT_IMAGE_DISCARD_ON_LOOP) && is_loop_device(m->node)))) {
 751                 options = strdup("discard");
 752                 if (!options)
 753                         return -ENOMEM;
 754         }
 755
 756         if (uid_is_valid(uid_shift) && uid_shift != 0 && fstype_can_uid_gid(fstype)) {
 757                 _cleanup_free_ char *uid_option = NULL;
 758
 759                 if (asprintf(&uid_option, "uid=" UID_FMT ",gid=" GID_FMT, uid_shift, (gid_t) uid_shift) < 0)
 760                         return -ENOMEM;
 761
 762                 if (!strextend_with_separator(&options, ",", uid_option, NULL))
 763                         return -ENOMEM;
 764         }
 765
 766         return mount_verbose(LOG_DEBUG, node, p, fstype, MS_NODEV|(rw ? 0 : MS_RDONLY), options);
 767 }
 768
 769 int dissected_image_mount(DissectedImage *m, const char *where, uid_t uid_shift, DissectImageFlags flags) {
 770         int r;
 771
 772         assert(m);
 773         assert(where);
 774
 775         if (!m->partitions[PARTITION_ROOT].found)
 776                 return -ENXIO;
 777
 778         if ((flags & DISSECT_IMAGE_MOUNT_NON_ROOT_ONLY) == 0) {
 779                 r = mount_partition(m->partitions + PARTITION_ROOT, where, NULL, uid_shift, flags);
 780                 if (r < 0)
 781                         return r;
 782         }
 783
 784         if ((flags & DISSECT_IMAGE_MOUNT_ROOT_ONLY))
 785                 return 0;
 786
 787         r = mount_partition(m->partitions + PARTITION_HOME, where, "/home", uid_shift, flags);
 788         if (r < 0)
 789                 return r;
 790
 791         r = mount_partition(m->partitions + PARTITION_SRV, where, "/srv", uid_shift, flags);
 792         if (r < 0)
 793                 return r;
 794
 795         if (m->partitions[PARTITION_ESP].found) {
 796                 const char *mp;
 797
 798                 /* Mount the ESP to /efi if it exists and is empty. If it doesn't exist, use /boot instead. */
 799
 800                 FOREACH_STRING(mp, "/efi", "/boot") {
 801                         _cleanup_free_ char *p = NULL;
 802
 803                         r = chase_symlinks(mp, where, CHASE_PREFIX_ROOT, &p);
 804                         if (r < 0)
 805                                 continue;
 806
 807                         r = dir_is_empty(p);
 808                         if (r > 0) {
 809                                 r = mount_partition(m->partitions + PARTITION_ESP, where, mp, uid_shift, flags);
 810                                 if (r < 0)
 811                                         return r;
 812                         }
 813                 }
 814         }
 815
 816         return 0;
 817 }
 818
 819 #if HAVE_LIBCRYPTSETUP
 820 typedef struct DecryptedPartition {
 821         struct crypt_device *device;
 822         char *name;
 823         bool relinquished;
 824 } DecryptedPartition;
 825
 826 struct DecryptedImage {
 827         DecryptedPartition *decrypted;
 828         size_t n_decrypted;
 829         size_t n_allocated;
 830 };
 831 #endif
 832
 833 DecryptedImage* decrypted_image_unref(DecryptedImage* d) {
 834 #if HAVE_LIBCRYPTSETUP
 835         size_t i;
 836         int r;
 837
 838         if (!d)
 839                 return NULL;
 840
 841         for (i = 0; i < d->n_decrypted; i++) {
 842                 DecryptedPartition *p = d->decrypted + i;
 843
 844                 if (p->device && p->name && !p->relinquished) {
 845                         r = crypt_deactivate(p->device, p->name);
 846                         if (r < 0)
 847                                 log_debug_errno(r, "Failed to deactivate encrypted partition %s", p->name);
 848                 }
 849
 850                 if (p->device)
 851                         crypt_free(p->device);
 852                 free(p->name);
 853         }
 854
 855         free(d);
 856 #endif
 857         return NULL;
 858 }
 859
 860 #if HAVE_LIBCRYPTSETUP
 861
 862 static int make_dm_name_and_node(const void *original_node, const char *suffix, char **ret_name, char **ret_node) {
 863         _cleanup_free_ char *name = NULL, *node = NULL;
 864         const char *base;
 865
 866         assert(original_node);
 867         assert(suffix);
 868         assert(ret_name);
 869         assert(ret_node);
 870
 871         base = strrchr(original_node, '/');
 872         if (!base)
 873                 return -EINVAL;
 874         base++;
 875         if (isempty(base))
 876                 return -EINVAL;
 877
 878         name = strjoin(base, suffix);
 879         if (!name)
 880                 return -ENOMEM;
 881         if (!filename_is_valid(name))
 882                 return -EINVAL;
 883
 884         node = strjoin(crypt_get_dir(), "/", name);
 885         if (!node)
 886                 return -ENOMEM;
 887
 888         *ret_name = TAKE_PTR(name);
 889         *ret_node = TAKE_PTR(node);
 890
 891         return 0;
 892 }
 893
 894 static int decrypt_partition(
 895                 DissectedPartition *m,
 896                 const char *passphrase,
 897                 DissectImageFlags flags,
 898                 DecryptedImage *d) {
 899
 900         _cleanup_free_ char *node = NULL, *name = NULL;
 901         _cleanup_(crypt_freep) struct crypt_device *cd = NULL;
 902         int r;
 903
 904         assert(m);
 905         assert(d);
 906
 907         if (!m->found || !m->node || !m->fstype)
 908                 return 0;
 909
 910         if (!streq(m->fstype, "crypto_LUKS"))
 911                 return 0;
 912
 913         if (!passphrase)
 914                 return -ENOKEY;
 915
 916         r = make_dm_name_and_node(m->node, "-decrypted", &name, &node);
 917         if (r < 0)
 918                 return r;
 919
 920         if (!GREEDY_REALLOC0(d->decrypted, d->n_allocated, d->n_decrypted + 1))
 921                 return -ENOMEM;
 922
 923         r = crypt_init(&cd, m->node);
 924         if (r < 0)
 925                 return log_debug_errno(r, "Failed to initialize dm-crypt: %m");
 926
 927         r = crypt_load(cd, CRYPT_LUKS, NULL);
 928         if (r < 0)
 929                 return log_debug_errno(r, "Failed to load LUKS metadata: %m");
 930
 931         r = crypt_activate_by_passphrase(cd, name, CRYPT_ANY_SLOT, passphrase, strlen(passphrase),
 932                                          ((flags & DISSECT_IMAGE_READ_ONLY) ? CRYPT_ACTIVATE_READONLY : 0) |
 933                                          ((flags & DISSECT_IMAGE_DISCARD_ON_CRYPTO) ? CRYPT_ACTIVATE_ALLOW_DISCARDS : 0));
 934         if (r < 0) {
 935                 log_debug_errno(r, "Failed to activate LUKS device: %m");
 936                 return r == -EPERM ? -EKEYREJECTED : r;
 937         }
 938
 939         d->decrypted[d->n_decrypted].name = TAKE_PTR(name);
 940         d->decrypted[d->n_decrypted].device = TAKE_PTR(cd);
 941         d->n_decrypted++;
 942
 943         m->decrypted_node = TAKE_PTR(node);
 944
 945         return 0;
 946 }
 947
 948 static int verity_partition(
 949                 DissectedPartition *m,
 950                 DissectedPartition *v,
 951                 const void *root_hash,
 952                 size_t root_hash_size,
 953                 DissectImageFlags flags,
 954                 DecryptedImage *d) {
 955
 956         _cleanup_free_ char *node = NULL, *name = NULL;
 957         _cleanup_(crypt_freep) struct crypt_device *cd = NULL;
 958         int r;
 959
 960         assert(m);
 961         assert(v);
 962
 963         if (!root_hash)
 964                 return 0;
 965
 966         if (!m->found || !m->node || !m->fstype)
 967                 return 0;
 968         if (!v->found || !v->node || !v->fstype)
 969                 return 0;
 970
 971         if (!streq(v->fstype, "DM_verity_hash"))
 972                 return 0;
 973
 974         r = make_dm_name_and_node(m->node, "-verity", &name, &node);
 975         if (r < 0)
 976                 return r;
 977
 978         if (!GREEDY_REALLOC0(d->decrypted, d->n_allocated, d->n_decrypted + 1))
 979                 return -ENOMEM;
 980
 981         r = crypt_init(&cd, v->node);
 982         if (r < 0)
 983                 return r;
 984
 985         r = crypt_load(cd, CRYPT_VERITY, NULL);
 986         if (r < 0)
 987                 return r;
 988
 989         r = crypt_set_data_device(cd, m->node);
 990         if (r < 0)
 991                 return r;
 992
 993         r = crypt_activate_by_volume_key(cd, name, root_hash, root_hash_size, CRYPT_ACTIVATE_READONLY);
 994         if (r < 0)
 995                 return r;
 996
 997         d->decrypted[d->n_decrypted].name = TAKE_PTR(name);
 998         d->decrypted[d->n_decrypted].device = TAKE_PTR(cd);
 999         d->n_decrypted++;
1000
1001         m->decrypted_node = TAKE_PTR(node);
1002
1003         return 0;
1004 }
1005 #endif
1006
1007 int dissected_image_decrypt(
1008                 DissectedImage *m,
1009                 const char *passphrase,
1010                 const void *root_hash,
1011                 size_t root_hash_size,
1012                 DissectImageFlags flags,
1013                 DecryptedImage **ret) {
1014
1015 #if HAVE_LIBCRYPTSETUP
1016         _cleanup_(decrypted_image_unrefp) DecryptedImage *d = NULL;
1017         unsigned i;
1018         int r;
1019 #endif
1020
1021         assert(m);
1022         assert(root_hash || root_hash_size == 0);
1023
1024         /* Returns:
1025          *
1026          *      = 0           → There was nothing to decrypt
1027          *      > 0           → Decrypted successfully
1028          *      -ENOKEY       → There's something to decrypt but no key was supplied
1029          *      -EKEYREJECTED → Passed key was not correct
1030          */
1031
1032         if (root_hash && root_hash_size < sizeof(sd_id128_t))
1033                 return -EINVAL;
1034
1035         if (!m->encrypted && !m->verity) {
1036                 *ret = NULL;
1037                 return 0;
1038         }
1039
1040 #if HAVE_LIBCRYPTSETUP
1041         d = new0(DecryptedImage, 1);
1042         if (!d)
1043                 return -ENOMEM;
1044
1045         for (i = 0; i < _PARTITION_DESIGNATOR_MAX; i++) {
1046                 DissectedPartition *p = m->partitions + i;
1047                 int k;
1048
1049                 if (!p->found)
1050                         continue;
1051
1052                 r = decrypt_partition(p, passphrase, flags, d);
1053                 if (r < 0)
1054                         return r;
1055
1056                 k = PARTITION_VERITY_OF(i);
1057                 if (k >= 0) {
1058                         r = verity_partition(p, m->partitions + k, root_hash, root_hash_size, flags, d);
1059                         if (r < 0)
1060                                 return r;
1061                 }
1062
1063                 if (!p->decrypted_fstype && p->decrypted_node) {
1064                         r = probe_filesystem(p->decrypted_node, &p->decrypted_fstype);
1065                         if (r < 0 && r != -EUCLEAN)
1066                                 return r;
1067                 }
1068         }
1069
1070         *ret = TAKE_PTR(d);
1071
1072         return 1;
1073 #else
1074         return -EOPNOTSUPP;
1075 #endif
1076 }
1077
1078 int dissected_image_decrypt_interactively(
1079                 DissectedImage *m,
1080                 const char *passphrase,
1081                 const void *root_hash,
1082                 size_t root_hash_size,
1083                 DissectImageFlags flags,
1084                 DecryptedImage **ret) {
1085
1086         _cleanup_strv_free_erase_ char **z = NULL;
1087         int n = 3, r;
1088
1089         if (passphrase)
1090                 n--;
1091
1092         for (;;) {
1093                 r = dissected_image_decrypt(m, passphrase, root_hash, root_hash_size, flags, ret);
1094                 if (r >= 0)
1095                         return r;
1096                 if (r == -EKEYREJECTED)
1097                         log_error_errno(r, "Incorrect passphrase, try again!");
1098                 else if (r != -ENOKEY) {
1099                         log_error_errno(r, "Failed to decrypt image: %m");
1100                         return r;
1101                 }
1102
1103                 if (--n < 0) {
1104                         log_error("Too many retries.");
1105                         return -EKEYREJECTED;
1106                 }
1107
1108                 z = strv_free(z);
1109
1110                 r = ask_password_auto("Please enter image passphrase!", NULL, "dissect", "dissect", USEC_INFINITY, 0, &z);
1111                 if (r < 0)
1112                         return log_error_errno(r, "Failed to query for passphrase: %m");
1113
1114                 passphrase = z[0];
1115         }
1116 }
1117
1118 #if HAVE_LIBCRYPTSETUP
1119 static int deferred_remove(DecryptedPartition *p) {
1120
1121         struct dm_ioctl dm = {
1122                 .version = {
1123                         DM_VERSION_MAJOR,
1124                         DM_VERSION_MINOR,
1125                         DM_VERSION_PATCHLEVEL
1126                 },
1127                 .data_size = sizeof(dm),
1128                 .flags = DM_DEFERRED_REMOVE,
1129         };
1130
1131         _cleanup_close_ int fd = -1;
1132
1133         assert(p);
1134
1135         /* Unfortunately, libcryptsetup doesn't provide a proper API for this, hence call the ioctl() directly. */
1136
1137         fd = open("/dev/mapper/control", O_RDWR|O_CLOEXEC);
1138         if (fd < 0)
1139                 return -errno;
1140
1141         strncpy(dm.name, p->name, sizeof(dm.name));
1142
1143         if (ioctl(fd, DM_DEV_REMOVE, &dm))
1144                 return -errno;
1145
1146         return 0;
1147 }
1148 #endif
1149
1150 int decrypted_image_relinquish(DecryptedImage *d) {
1151
1152 #if HAVE_LIBCRYPTSETUP
1153         size_t i;
1154         int r;
1155 #endif
1156
1157         assert(d);
1158
1159         /* Turns on automatic removal after the last use ended for all DM devices of this image, and sets a boolean so
1160          * that we don't clean it up ourselves either anymore */
1161
1162 #if HAVE_LIBCRYPTSETUP
1163         for (i = 0; i < d->n_decrypted; i++) {
1164                 DecryptedPartition *p = d->decrypted + i;
1165
1166                 if (p->relinquished)
1167                         continue;
1168
1169                 r = deferred_remove(p);
1170                 if (r < 0)
1171                         return log_debug_errno(r, "Failed to mark %s for auto-removal: %m", p->name);
1172
1173                 p->relinquished = true;
1174         }
1175 #endif
1176
1177         return 0;
1178 }
1179
1180 int root_hash_load(const char *image, void **ret, size_t *ret_size) {
1181         _cleanup_free_ char *text = NULL;
1182         _cleanup_free_ void *k = NULL;
1183         size_t l;
1184         int r;
1185
1186         assert(image);
1187         assert(ret);
1188         assert(ret_size);
1189
1190         if (is_device_path(image)) {
1191                 /* If we are asked to load the root hash for a device node, exit early */
1192                 *ret = NULL;
1193                 *ret_size = 0;
1194                 return 0;
1195         }
1196
1197         r = getxattr_malloc(image, "user.verity.roothash", &text, true);
1198         if (r < 0) {
1199                 char *fn, *e, *n;
1200
1201                 if (!IN_SET(r, -ENODATA, -EOPNOTSUPP, -ENOENT))
1202                         return r;
1203
1204                 fn = newa(char, strlen(image) + STRLEN(".roothash") + 1);
1205                 n = stpcpy(fn, image);
1206                 e = endswith(fn, ".raw");
1207                 if (e)
1208                         n = e;
1209
1210                 strcpy(n, ".roothash");
1211
1212                 r = read_one_line_file(fn, &text);
1213                 if (r == -ENOENT) {
1214                         *ret = NULL;
1215                         *ret_size = 0;
1216                         return 0;
1217                 }
1218                 if (r < 0)
1219                         return r;
1220         }
1221
1222         r = unhexmem(text, strlen(text), &k, &l);
1223         if (r < 0)
1224                 return r;
1225         if (l < sizeof(sd_id128_t))
1226                 return -EINVAL;
1227
1228         *ret = TAKE_PTR(k);
1229         *ret_size = l;
1230
1231         return 1;
1232 }
1233
1234 int dissected_image_acquire_metadata(DissectedImage *m) {
1235
1236         enum {
1237                 META_HOSTNAME,
1238                 META_MACHINE_ID,
1239                 META_MACHINE_INFO,
1240                 META_OS_RELEASE,
1241                 _META_MAX,
1242         };
1243
1244         static const char *const paths[_META_MAX] = {
1245                 [META_HOSTNAME]     = "/etc/hostname\0",
1246                 [META_MACHINE_ID]   = "/etc/machine-id\0",
1247                 [META_MACHINE_INFO] = "/etc/machine-info\0",
1248                 [META_OS_RELEASE]   = "/etc/os-release\0/usr/lib/os-release\0",
1249         };
1250
1251         _cleanup_strv_free_ char **machine_info = NULL, **os_release = NULL;
1252         _cleanup_(rmdir_and_freep) char *t = NULL;
1253         _cleanup_(sigkill_waitp) pid_t child = 0;
1254         sd_id128_t machine_id = SD_ID128_NULL;
1255         _cleanup_free_ char *hostname = NULL;
1256         unsigned n_meta_initialized = 0, k;
1257         int fds[2 * _META_MAX], r;
1258
1259         BLOCK_SIGNALS(SIGCHLD);
1260
1261         assert(m);
1262
1263         for (; n_meta_initialized < _META_MAX; n_meta_initialized ++)
1264                 if (pipe2(fds + 2*n_meta_initialized, O_CLOEXEC) < 0) {
1265                         r = -errno;
1266                         goto finish;
1267                 }
1268
1269         r = mkdtemp_malloc("/tmp/dissect-XXXXXX", &t);
1270         if (r < 0)
1271                 goto finish;
1272
1273         r = safe_fork("(sd-dissect)", FORK_RESET_SIGNALS|FORK_DEATHSIG|FORK_NEW_MOUNTNS, &child);
1274         if (r < 0)
1275                 goto finish;
1276         if (r == 0) {
1277                 /* Make sure we never propagate to the host */
1278                 if (mount(NULL, "/", NULL, MS_SLAVE | MS_REC, NULL) < 0)
1279                         _exit(EXIT_FAILURE);
1280
1281                 r = dissected_image_mount(m, t, UID_INVALID, DISSECT_IMAGE_READ_ONLY|DISSECT_IMAGE_MOUNT_ROOT_ONLY);
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);