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util-lib: move open_serialization_fd() to serialize.c
[thirdparty/systemd.git] / src / shared / dissect-image.c
CommitLineData
53e1b683 1/* SPDX-License-Identifier: LGPL-2.1+ */
8c1be37e
LP		 2
3#include <sys/mount.h>
3b925504
LP		 4#include <sys/prctl.h>
5#include <sys/wait.h>
8c1be37e 6
3c1f2cee 7#include "sd-device.h"
dccca82b
LP		 8#include "sd-id128.h"
9
8c1be37e 10#include "architecture.h"
18b5886e 11#include "ask-password-api.h"
8c1be37e 12#include "blkid-util.h"
18c528e9 13#include "blockdev-util.h"
3b925504 14#include "copy.h"
294bd454 15#include "crypt-util.h"
3b925504 16#include "def.h"
553e15f2 17#include "device-nodes.h"
8437c059 18#include "device-util.h"
8c1be37e 19#include "dissect-image.h"
18b5886e 20#include "fd-util.h"
78ebe980 21#include "fileio.h"
2eedfd2d 22#include "fs-util.h"
8c1be37e 23#include "gpt.h"
78ebe980 24#include "hexdecoct.h"
3b925504
LP		 25#include "hostname-util.h"
26#include "id128-util.h"
dcce98a4 27#include "linux-3.13/dm-ioctl.h"
ffc01f06 28#include "missing.h"
8c1be37e 29#include "mount-util.h"
e4de7287 30#include "mountpoint-util.h"
d58ad743 31#include "os-util.h"
8c1be37e 32#include "path-util.h"
3b925504
LP		 33#include "process-util.h"
34#include "raw-clone.h"
35#include "signal-util.h"
8c1be37e 36#include "stat-util.h"
18b5886e 37#include "stdio-util.h"
8c1be37e
LP		 38#include "string-table.h"
39#include "string-util.h"
2eedfd2d 40#include "strv.h"
e4de7287 41#include "tmpfile-util.h"
2d3a5a73 42#include "user-util.h"
41488e1f 43#include "xattr-util.h"
8c1be37e 44
c34b75a1 45int probe_filesystem(const char *node, char **ret_fstype) {
7cc84b2c
ZJS		 46 /* Try to find device content type and return it in *ret_fstype. If nothing is found,
47 * 0/NULL will be returned. -EUCLEAN will be returned for ambigous results, and an
48 * different error otherwise. */
49
349cc4a5 50#if HAVE_BLKID
8e766630 51 _cleanup_(blkid_free_probep) blkid_probe b = NULL;
18b5886e
LP		 52 const char *fstype;
53 int r;
54
995fa2e5 55 errno = 0;
18b5886e
LP		 56 b = blkid_new_probe_from_filename(node);
57 if (!b)
995fa2e5 58 return -errno ?: -ENOMEM;
18b5886e
LP		 59
60 blkid_probe_enable_superblocks(b, 1);
61 blkid_probe_set_superblocks_flags(b, BLKID_SUBLKS_TYPE);
62
63 errno = 0;
64 r = blkid_do_safeprobe(b);
7cc84b2c
ZJS		 65 if (r == 1) {
66 log_debug("No type detected on partition %s", node);
18b5886e
LP		 67 goto not_found;
68 }
7cc84b2c
ZJS		 69 if (r == -2) {
70 log_debug("Results ambiguous for partition %s", node);
71 return -EUCLEAN;
72 }
b382db9f
ZJS		 73 if (r != 0)
74 return -errno ?: -EIO;
18b5886e
LP		 75
76 (void) blkid_probe_lookup_value(b, "TYPE", &fstype, NULL);
77
78 if (fstype) {
79 char *t;
80
81 t = strdup(fstype);
82 if (!t)
83 return -ENOMEM;
84
85 *ret_fstype = t;
86 return 1;
87 }
88
89not_found:
90 *ret_fstype = NULL;
91 return 0;
d1c536f5
ZJS		 92#else
93 return -EOPNOTSUPP;
a75e27eb 94#endif
d1c536f5 95}
18b5886e 96
40c10d3f 97#if HAVE_BLKID
cde942f6
JPRV		 98/* Detect RPMB and Boot partitions, which are not listed by blkid.
99 * See https://github.com/systemd/systemd/issues/5806. */
3c1f2cee 100static bool device_is_mmc_special_partition(sd_device *d) {
aae22eb3
LP		 101 const char *sysname;
102
3c1f2cee
YW		 103 if (sd_device_get_sysname(d, &sysname) < 0)
104 return false;
105
106 return startswith(sysname, "mmcblk") &&
0cfa78dd 107 (endswith(sysname, "rpmb") || endswith(sysname, "boot0") || endswith(sysname, "boot1"));
cde942f6
JPRV		 108}
109
3c1f2cee 110static bool device_is_block(sd_device *d) {
aae22eb3
LP		 111 const char *ss;
112
3c1f2cee 113 if (sd_device_get_subsystem(d, &ss) < 0)
aae22eb3
LP		 114 return false;
115
116 return streq(ss, "block");
117}
40c10d3f 118#endif
aae22eb3 119
4526113f
LP		 120int dissect_image(
121 int fd,
122 const void *root_hash,
123 size_t root_hash_size,
124 DissectImageFlags flags,
125 DissectedImage **ret) {
8c1be37e 126
349cc4a5 127#if HAVE_BLKID
4623e8e6 128 sd_id128_t root_uuid = SD_ID128_NULL, verity_uuid = SD_ID128_NULL;
3c1f2cee 129 _cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL;
8c1be37e 130 bool is_gpt, is_mbr, generic_rw, multiple_generic = false;
3c1f2cee 131 _cleanup_(sd_device_unrefp) sd_device *d = NULL;
8c1be37e 132 _cleanup_(dissected_image_unrefp) DissectedImage *m = NULL;
8e766630 133 _cleanup_(blkid_free_probep) blkid_probe b = NULL;
8c1be37e 134 _cleanup_free_ char *generic_node = NULL;
be30ad41 135 sd_id128_t generic_uuid = SD_ID128_NULL;
9b6deb03 136 const char *pttype = NULL;
8c1be37e
LP		 137 blkid_partlist pl;
138 int r, generic_nr;
139 struct stat st;
3c1f2cee 140 sd_device *q;
8c1be37e
LP		 141 unsigned i;
142
143 assert(fd >= 0);
144 assert(ret);
4623e8e6 145 assert(root_hash || root_hash_size == 0);
8c1be37e
LP		 146
147 /* Probes a disk image, and returns information about what it found in *ret.
148 *
4623e8e6
LP		 149 * Returns -ENOPKG if no suitable partition table or file system could be found.
150 * Returns -EADDRNOTAVAIL if a root hash was specified but no matching root/verity partitions found. */
151
152 if (root_hash) {
153 /* If a root hash is supplied, then we use the root partition that has a UUID that match the first
154 * 128bit of the root hash. And we use the verity partition that has a UUID that match the final
155 * 128bit. */
156
157 if (root_hash_size < sizeof(sd_id128_t))
158 return -EINVAL;
159
160 memcpy(&root_uuid, root_hash, sizeof(sd_id128_t));
161 memcpy(&verity_uuid, (const uint8_t*) root_hash + root_hash_size - sizeof(sd_id128_t), sizeof(sd_id128_t));
162
163 if (sd_id128_is_null(root_uuid))
164 return -EINVAL;
165 if (sd_id128_is_null(verity_uuid))
166 return -EINVAL;
167 }
8c1be37e
LP		 168
169 if (fstat(fd, &st) < 0)
170 return -errno;
171
172 if (!S_ISBLK(st.st_mode))
173 return -ENOTBLK;
174
175 b = blkid_new_probe();
176 if (!b)
177 return -ENOMEM;
178
179 errno = 0;
180 r = blkid_probe_set_device(b, fd, 0, 0);
b382db9f
ZJS		 181 if (r != 0)
182 return -errno ?: -ENOMEM;
8c1be37e 183
9b6deb03
LP		 184 if ((flags & DISSECT_IMAGE_GPT_ONLY) == 0) {
185 /* Look for file system superblocks, unless we only shall look for GPT partition tables */
186 blkid_probe_enable_superblocks(b, 1);
187 blkid_probe_set_superblocks_flags(b, BLKID_SUBLKS_TYPE|BLKID_SUBLKS_USAGE);
188 }
189
8c1be37e
LP		 190 blkid_probe_enable_partitions(b, 1);
191 blkid_probe_set_partitions_flags(b, BLKID_PARTS_ENTRY_DETAILS);
192
193 errno = 0;
194 r = blkid_do_safeprobe(b);
4c701096 195 if (IN_SET(r, -2, 1)) {
8c1be37e
LP		 196 log_debug("Failed to identify any partition table.");
197 return -ENOPKG;
198 }
b382db9f
ZJS		 199 if (r != 0)
200 return -errno ?: -EIO;
8c1be37e
LP		 201
202 m = new0(DissectedImage, 1);
203 if (!m)
204 return -ENOMEM;
205
e0f9e7bd
LP		 206 if (!(flags & DISSECT_IMAGE_GPT_ONLY) &&
207 (flags & DISSECT_IMAGE_REQUIRE_ROOT)) {
9b6deb03 208 const char *usage = NULL;
8c1be37e 209
9b6deb03
LP		 210 (void) blkid_probe_lookup_value(b, "USAGE", &usage, NULL);
211 if (STRPTR_IN_SET(usage, "filesystem", "crypto")) {
212 _cleanup_free_ char *t = NULL, *n = NULL;
213 const char *fstype = NULL;
8c1be37e 214
9b6deb03
LP		 215 /* OK, we have found a file system, that's our root partition then. */
216 (void) blkid_probe_lookup_value(b, "TYPE", &fstype, NULL);
8c1be37e 217
9b6deb03
LP		 218 if (fstype) {
219 t = strdup(fstype);
220 if (!t)
221 return -ENOMEM;
222 }
223
54b22b26
LP		 224 r = device_path_make_major_minor(st.st_mode, st.st_rdev, &n);
225 if (r < 0)
226 return r;
8c1be37e 227
9b6deb03
LP		 228 m->partitions[PARTITION_ROOT] = (DissectedPartition) {
229 .found = true,
230 .rw = true,
231 .partno = -1,
232 .architecture = _ARCHITECTURE_INVALID,
1cc6c93a
YW		 233 .fstype = TAKE_PTR(t),
234 .node = TAKE_PTR(n),
9b6deb03 235 };
8c1be37e 236
4db1879a 237 m->encrypted = streq_ptr(fstype, "crypto_LUKS");
18b5886e 238
1cc6c93a 239 *ret = TAKE_PTR(m);
8c1be37e 240
9b6deb03
LP		 241 return 0;
242 }
8c1be37e
LP		 243 }
244
245 (void) blkid_probe_lookup_value(b, "PTTYPE", &pttype, NULL);
246 if (!pttype)
247 return -ENOPKG;
248
249 is_gpt = streq_ptr(pttype, "gpt");
250 is_mbr = streq_ptr(pttype, "dos");
251
9b6deb03 252 if (!is_gpt && ((flags & DISSECT_IMAGE_GPT_ONLY) || !is_mbr))
8c1be37e
LP		 253 return -ENOPKG;
254
255 errno = 0;
256 pl = blkid_probe_get_partitions(b);
b382db9f
ZJS		 257 if (!pl)
258 return -errno ?: -ENOMEM;
8c1be37e 259
3c1f2cee
YW		 260 r = sd_device_new_from_devnum(&d, 'b', st.st_rdev);
261 if (r < 0)
262 return r;
8c1be37e
LP		 263
264 for (i = 0;; i++) {
265 int n, z;
266
267 if (i >= 10) {
268 log_debug("Kernel partitions never appeared.");
269 return -ENXIO;
270 }
271
3c1f2cee
YW		 272 r = sd_device_enumerator_new(&e);
273 if (r < 0)
274 return r;
275
276 r = sd_device_enumerator_allow_uninitialized(e);
277 if (r < 0)
278 return r;
8c1be37e 279
3c1f2cee 280 r = sd_device_enumerator_add_match_parent(e, d);
8c1be37e
LP		 281 if (r < 0)
282 return r;
283
8c1be37e
LP		 284 /* Count the partitions enumerated by the kernel */
285 n = 0;
8437c059 286 FOREACH_DEVICE(e, q) {
fbd0aea1 287 if (sd_device_get_devnum(q, NULL) < 0)
aae22eb3
LP		 288 continue;
289
290 if (!device_is_block(q))
291 continue;
292
cde942f6
JPRV		 293 if (device_is_mmc_special_partition(q))
294 continue;
8c1be37e 295 n++;
cde942f6 296 }
8c1be37e
LP		 297
298 /* Count the partitions enumerated by blkid */
299 z = blkid_partlist_numof_partitions(pl);
300 if (n == z + 1)
301 break;
302 if (n > z + 1) {
303 log_debug("blkid and kernel partition list do not match.");
304 return -EIO;
305 }
306 if (n < z + 1) {
759aaedc 307 unsigned j = 0;
8c1be37e
LP		 308
309 /* The kernel has probed fewer partitions than blkid? Maybe the kernel prober is still running
310 * or it got EBUSY because udev already opened the device. Let's reprobe the device, which is a
311 * synchronous call that waits until probing is complete. */
312
759aaedc
LP		 313 for (;;) {
314 if (j++ > 20)
315 return -EBUSY;
8c1be37e 316
759aaedc 317 if (ioctl(fd, BLKRRPART, 0) < 0) {
8c1be37e 318 r = -errno;
759aaedc
LP		 319
320 if (r == -EINVAL) {
321 struct loop_info64 info;
322
323 /* If we are running on a loop device that has partition scanning off,
324 * return an explicit recognizable error about this, so that callers
325 * can generate a proper message explaining the situation. */
326
327 if (ioctl(fd, LOOP_GET_STATUS64, &info) >= 0 && (info.lo_flags & LO_FLAGS_PARTSCAN) == 0) {
328 log_debug("Device is loop device and partition scanning is off!");
329 return -EPROTONOSUPPORT;
330 }
331 }
332 if (r != -EBUSY)
333 return r;
334 } else
8c1be37e
LP		 335 break;
336
337 /* If something else has the device open, such as an udev rule, the ioctl will return
338 * EBUSY. Since there's no way to wait until it isn't busy anymore, let's just wait a
339 * bit, and try again.
340 *
341 * This is really something they should fix in the kernel! */
342
759aaedc 343 (void) usleep(50 * USEC_PER_MSEC);
8c1be37e 344 }
8c1be37e
LP		 345 }
346
3c1f2cee 347 e = sd_device_enumerator_unref(e);
8c1be37e
LP		 348 }
349
8437c059 350 FOREACH_DEVICE(e, q) {
9b6deb03 351 unsigned long long pflags;
8c1be37e 352 blkid_partition pp;
cde942f6 353 const char *node;
8c1be37e
LP		 354 dev_t qn;
355 int nr;
356
3c1f2cee
YW		 357 r = sd_device_get_devnum(q, &qn);
358 if (r < 0)
8c1be37e
LP		 359 continue;
360
361 if (st.st_rdev == qn)
362 continue;
363
aae22eb3
LP		 364 if (!device_is_block(q))
365 continue;
366
cde942f6 367 if (device_is_mmc_special_partition(q))
7be1420f
LP		 368 continue;
369
3c1f2cee
YW		 370 r = sd_device_get_devname(q, &node);
371 if (r < 0)
8c1be37e
LP		 372 continue;
373
374 pp = blkid_partlist_devno_to_partition(pl, qn);
375 if (!pp)
376 continue;
377
9b6deb03 378 pflags = blkid_partition_get_flags(pp);
8c1be37e
LP		 379
380 nr = blkid_partition_get_partno(pp);
381 if (nr < 0)
382 continue;
383
384 if (is_gpt) {
385 int designator = _PARTITION_DESIGNATOR_INVALID, architecture = _ARCHITECTURE_INVALID;
4623e8e6
LP		 386 const char *stype, *sid, *fstype = NULL;
387 sd_id128_t type_id, id;
8c1be37e
LP		 388 bool rw = true;
389
4623e8e6
LP		 390 sid = blkid_partition_get_uuid(pp);
391 if (!sid)
392 continue;
393 if (sd_id128_from_string(sid, &id) < 0)
394 continue;
395
8c1be37e
LP		 396 stype = blkid_partition_get_type_string(pp);
397 if (!stype)
398 continue;
8c1be37e
LP		 399 if (sd_id128_from_string(stype, &type_id) < 0)
400 continue;
401
402 if (sd_id128_equal(type_id, GPT_HOME)) {
a48dd347
LP		 403
404 if (pflags & GPT_FLAG_NO_AUTO)
405 continue;
406
8c1be37e 407 designator = PARTITION_HOME;
9b6deb03 408 rw = !(pflags & GPT_FLAG_READ_ONLY);
8c1be37e 409 } else if (sd_id128_equal(type_id, GPT_SRV)) {
a48dd347
LP		 410
411 if (pflags & GPT_FLAG_NO_AUTO)
412 continue;
413
8c1be37e 414 designator = PARTITION_SRV;
9b6deb03 415 rw = !(pflags & GPT_FLAG_READ_ONLY);
8c1be37e 416 } else if (sd_id128_equal(type_id, GPT_ESP)) {
a48dd347
LP		 417
418 /* Note that we don't check the GPT_FLAG_NO_AUTO flag for the ESP, as it is not defined
419 * there. We instead check the GPT_FLAG_NO_BLOCK_IO_PROTOCOL, as recommended by the
420 * UEFI spec (See "12.3.3 Number and Location of System Partitions"). */
421
422 if (pflags & GPT_FLAG_NO_BLOCK_IO_PROTOCOL)
423 continue;
424
8c1be37e
LP		 425 designator = PARTITION_ESP;
426 fstype = "vfat";
427 }
428#ifdef GPT_ROOT_NATIVE
429 else if (sd_id128_equal(type_id, GPT_ROOT_NATIVE)) {
4623e8e6 430
a48dd347
LP		 431 if (pflags & GPT_FLAG_NO_AUTO)
432 continue;
433
4623e8e6
LP		 434 /* If a root ID is specified, ignore everything but the root id */
435 if (!sd_id128_is_null(root_uuid) && !sd_id128_equal(root_uuid, id))
436 continue;
437
8c1be37e
LP		 438 designator = PARTITION_ROOT;
439 architecture = native_architecture();
9b6deb03 440 rw = !(pflags & GPT_FLAG_READ_ONLY);
4f8b86e3 441 } else if (sd_id128_equal(type_id, GPT_ROOT_NATIVE_VERITY)) {
4623e8e6 442
a48dd347
LP		 443 if (pflags & GPT_FLAG_NO_AUTO)
444 continue;
445
4623e8e6
LP		 446 m->can_verity = true;
447
448 /* Ignore verity unless a root hash is specified */
449 if (sd_id128_is_null(verity_uuid) || !sd_id128_equal(verity_uuid, id))
450 continue;
451
452 designator = PARTITION_ROOT_VERITY;
453 fstype = "DM_verity_hash";
454 architecture = native_architecture();
455 rw = false;
456 }
457#endif
8c1be37e
LP		 458#ifdef GPT_ROOT_SECONDARY
459 else if (sd_id128_equal(type_id, GPT_ROOT_SECONDARY)) {
4623e8e6 460
a48dd347
LP		 461 if (pflags & GPT_FLAG_NO_AUTO)
462 continue;
463
4623e8e6
LP		 464 /* If a root ID is specified, ignore everything but the root id */
465 if (!sd_id128_is_null(root_uuid) && !sd_id128_equal(root_uuid, id))
466 continue;
467
8c1be37e
LP		 468 designator = PARTITION_ROOT_SECONDARY;
469 architecture = SECONDARY_ARCHITECTURE;
9b6deb03 470 rw = !(pflags & GPT_FLAG_READ_ONLY);
4f8b86e3 471 } else if (sd_id128_equal(type_id, GPT_ROOT_SECONDARY_VERITY)) {
a48dd347
LP		 472
473 if (pflags & GPT_FLAG_NO_AUTO)
474 continue;
475
4623e8e6
LP		 476 m->can_verity = true;
477
478 /* Ignore verity unless root has is specified */
479 if (sd_id128_is_null(verity_uuid) || !sd_id128_equal(verity_uuid, id))
480 continue;
481
482 designator = PARTITION_ROOT_SECONDARY_VERITY;
483 fstype = "DM_verity_hash";
484 architecture = SECONDARY_ARCHITECTURE;
485 rw = false;
486 }
8c1be37e
LP		 487#endif
488 else if (sd_id128_equal(type_id, GPT_SWAP)) {
a48dd347
LP		 489
490 if (pflags & GPT_FLAG_NO_AUTO)
491 continue;
492
8c1be37e
LP		 493 designator = PARTITION_SWAP;
494 fstype = "swap";
495 } else if (sd_id128_equal(type_id, GPT_LINUX_GENERIC)) {
496
a48dd347
LP		 497 if (pflags & GPT_FLAG_NO_AUTO)
498 continue;
499
8c1be37e
LP		 500 if (generic_node)
501 multiple_generic = true;
502 else {
503 generic_nr = nr;
9b6deb03 504 generic_rw = !(pflags & GPT_FLAG_READ_ONLY);
be30ad41 505 generic_uuid = id;
8c1be37e
LP		 506 generic_node = strdup(node);
507 if (!generic_node)
508 return -ENOMEM;
509 }
510 }
511
512 if (designator != _PARTITION_DESIGNATOR_INVALID) {
513 _cleanup_free_ char *t = NULL, *n = NULL;
514
515 /* First one wins */
516 if (m->partitions[designator].found)
517 continue;
518
519 if (fstype) {
520 t = strdup(fstype);
521 if (!t)
522 return -ENOMEM;
523 }
524
525 n = strdup(node);
526 if (!n)
527 return -ENOMEM;
528
529 m->partitions[designator] = (DissectedPartition) {
530 .found = true,
531 .partno = nr,
532 .rw = rw,
533 .architecture = architecture,
1cc6c93a
YW		 534 .node = TAKE_PTR(n),
535 .fstype = TAKE_PTR(t),
be30ad41 536 .uuid = id,
8c1be37e 537 };
8c1be37e
LP		 538 }
539
540 } else if (is_mbr) {
541
9b6deb03 542 if (pflags != 0x80) /* Bootable flag */
8c1be37e
LP		 543 continue;
544
545 if (blkid_partition_get_type(pp) != 0x83) /* Linux partition */
546 continue;
547
548 if (generic_node)
549 multiple_generic = true;
550 else {
551 generic_nr = nr;
552 generic_rw = true;
553 generic_node = strdup(node);
554 if (!generic_node)
555 return -ENOMEM;
556 }
557 }
558 }
559
560 if (!m->partitions[PARTITION_ROOT].found) {
561 /* No root partition found? Then let's see if ther's one for the secondary architecture. And if not
562 * either, then check if there's a single generic one, and use that. */
563
4623e8e6 564 if (m->partitions[PARTITION_ROOT_VERITY].found)
e0f9e7bd 565 return -EADDRNOTAVAIL;
4623e8e6 566
8c1be37e
LP		 567 if (m->partitions[PARTITION_ROOT_SECONDARY].found) {
568 m->partitions[PARTITION_ROOT] = m->partitions[PARTITION_ROOT_SECONDARY];
569 zero(m->partitions[PARTITION_ROOT_SECONDARY]);
4623e8e6
LP		 570
571 m->partitions[PARTITION_ROOT_VERITY] = m->partitions[PARTITION_ROOT_SECONDARY_VERITY];
572 zero(m->partitions[PARTITION_ROOT_SECONDARY_VERITY]);
573
e0f9e7bd
LP		 574 } else if (flags & DISSECT_IMAGE_REQUIRE_ROOT) {
575
576 /* If the root has was set, then we won't fallback to a generic node, because the root hash
577 * decides */
578 if (root_hash)
579 return -EADDRNOTAVAIL;
8c1be37e 580
e0f9e7bd
LP		 581 /* If we didn't find a generic node, then we can't fix this up either */
582 if (!generic_node)
583 return -ENXIO;
584
585 /* If we didn't find a properly marked root partition, but we did find a single suitable
586 * generic Linux partition, then use this as root partition, if the caller asked for it. */
8c1be37e
LP		 587 if (multiple_generic)
588 return -ENOTUNIQ;
589
590 m->partitions[PARTITION_ROOT] = (DissectedPartition) {
591 .found = true,
592 .rw = generic_rw,
593 .partno = generic_nr,
594 .architecture = _ARCHITECTURE_INVALID,
1cc6c93a 595 .node = TAKE_PTR(generic_node),
be30ad41 596 .uuid = generic_uuid,
8c1be37e 597 };
e0f9e7bd 598 }
8c1be37e
LP		 599 }
600
4623e8e6 601 if (root_hash) {
e0f9e7bd 602 if (!m->partitions[PARTITION_ROOT_VERITY].found || !m->partitions[PARTITION_ROOT].found)
4623e8e6
LP		 603 return -EADDRNOTAVAIL;
604
605 /* If we found the primary root with the hash, then we definitely want to suppress any secondary root
606 * (which would be weird, after all the root hash should only be assigned to one pair of
607 * partitions... */
608 m->partitions[PARTITION_ROOT_SECONDARY].found = false;
609 m->partitions[PARTITION_ROOT_SECONDARY_VERITY].found = false;
610
611 /* If we found a verity setup, then the root partition is necessarily read-only. */
612 m->partitions[PARTITION_ROOT].rw = false;
613
614 m->verity = true;
615 }
616
18b5886e
LP		 617 blkid_free_probe(b);
618 b = NULL;
619
8c1be37e
LP		 620 /* Fill in file system types if we don't know them yet. */
621 for (i = 0; i < _PARTITION_DESIGNATOR_MAX; i++) {
18b5886e 622 DissectedPartition *p = m->partitions + i;
8c1be37e 623
18b5886e 624 if (!p->found)
8c1be37e
LP		 625 continue;
626
18b5886e
LP		 627 if (!p->fstype && p->node) {
628 r = probe_filesystem(p->node, &p->fstype);
7cc84b2c 629 if (r < 0 && r != -EUCLEAN)
18b5886e 630 return r;
8c1be37e
LP		 631 }
632
18b5886e
LP		 633 if (streq_ptr(p->fstype, "crypto_LUKS"))
634 m->encrypted = true;
896f937f
LP		 635
636 if (p->fstype && fstype_is_ro(p->fstype))
637 p->rw = false;
8c1be37e
LP		 638 }
639
1cc6c93a 640 *ret = TAKE_PTR(m);
8c1be37e
LP		 641
642 return 0;
643#else
644 return -EOPNOTSUPP;
645#endif
646}
647
648DissectedImage* dissected_image_unref(DissectedImage *m) {
649 unsigned i;
650
651 if (!m)
652 return NULL;
653
654 for (i = 0; i < _PARTITION_DESIGNATOR_MAX; i++) {
655 free(m->partitions[i].fstype);
656 free(m->partitions[i].node);
18b5886e
LP		 657 free(m->partitions[i].decrypted_fstype);
658 free(m->partitions[i].decrypted_node);
8c1be37e
LP		 659 }
660
3b925504
LP		 661 free(m->hostname);
662 strv_free(m->machine_info);
663 strv_free(m->os_release);
664
5fecf46d 665 return mfree(m);
8c1be37e
LP		 666}
667
18b5886e 668static int is_loop_device(const char *path) {
553e15f2 669 char s[SYS_BLOCK_PATH_MAX("/../loop/")];
18b5886e
LP		 670 struct stat st;
671
672 assert(path);
673
674 if (stat(path, &st) < 0)
675 return -errno;
676
677 if (!S_ISBLK(st.st_mode))
678 return -ENOTBLK;
679
553e15f2 680 xsprintf_sys_block_path(s, "/loop/", st.st_dev);
18b5886e
LP		 681 if (access(s, F_OK) < 0) {
682 if (errno != ENOENT)
683 return -errno;
684
685 /* The device itself isn't a loop device, but maybe it's a partition and its parent is? */
553e15f2 686 xsprintf_sys_block_path(s, "/../loop/", st.st_dev);
18b5886e
LP		 687 if (access(s, F_OK) < 0)
688 return errno == ENOENT ? false : -errno;
689 }
690
691 return true;
692}
693
694static int mount_partition(
695 DissectedPartition *m,
696 const char *where,
697 const char *directory,
2d3a5a73 698 uid_t uid_shift,
18b5886e
LP		 699 DissectImageFlags flags) {
700
2d3a5a73
LP		 701 _cleanup_free_ char *chased = NULL, *options = NULL;
702 const char *p, *node, *fstype;
8c1be37e 703 bool rw;
2eedfd2d 704 int r;
8c1be37e
LP		 705
706 assert(m);
707 assert(where);
708
18b5886e
LP		 709 node = m->decrypted_node ?: m->node;
710 fstype = m->decrypted_fstype ?: m->fstype;
711
712 if (!m->found || !node || !fstype)
8c1be37e
LP		 713 return 0;
714
18b5886e
LP		 715 /* Stacked encryption? Yuck */
716 if (streq_ptr(fstype, "crypto_LUKS"))
717 return -ELOOP;
718
719 rw = m->rw && !(flags & DISSECT_IMAGE_READ_ONLY);
8c1be37e 720
2eedfd2d
LP		 721 if (directory) {
722 r = chase_symlinks(directory, where, CHASE_PREFIX_ROOT, &chased);
723 if (r < 0)
724 return r;
725
726 p = chased;
727 } else
8c1be37e
LP		 728 p = where;
729
18b5886e 730 /* If requested, turn on discard support. */
154d2269 731 if (fstype_can_discard(fstype) &&
18b5886e 732 ((flags & DISSECT_IMAGE_DISCARD) ||
2d3a5a73
LP		 733 ((flags & DISSECT_IMAGE_DISCARD_ON_LOOP) && is_loop_device(m->node)))) {
734 options = strdup("discard");
735 if (!options)
736 return -ENOMEM;
737 }
738
739 if (uid_is_valid(uid_shift) && uid_shift != 0 && fstype_can_uid_gid(fstype)) {
740 _cleanup_free_ char *uid_option = NULL;
741
742 if (asprintf(&uid_option, "uid=" UID_FMT ",gid=" GID_FMT, uid_shift, (gid_t) uid_shift) < 0)
743 return -ENOMEM;
744
745 if (!strextend_with_separator(&options, ",", uid_option, NULL))
746 return -ENOMEM;
747 }
8c1be37e 748
18b5886e 749 return mount_verbose(LOG_DEBUG, node, p, fstype, MS_NODEV|(rw ? 0 : MS_RDONLY), options);
8c1be37e
LP		 750}
751
2d3a5a73 752int dissected_image_mount(DissectedImage *m, const char *where, uid_t uid_shift, DissectImageFlags flags) {
8c1be37e
LP		 753 int r;
754
755 assert(m);
756 assert(where);
757
758 if (!m->partitions[PARTITION_ROOT].found)
759 return -ENXIO;
760
2d3a5a73
LP		 761 if ((flags & DISSECT_IMAGE_MOUNT_NON_ROOT_ONLY) == 0) {
762 r = mount_partition(m->partitions + PARTITION_ROOT, where, NULL, uid_shift, flags);
763 if (r < 0)
764 return r;
03bcb6d4
LP		 765
766 if (flags & DISSECT_IMAGE_VALIDATE_OS) {
767 r = path_is_os_tree(where);
768 if (r < 0)
769 return r;
770 if (r == 0)
771 return -EMEDIUMTYPE;
772 }
2d3a5a73
LP		 773 }
774
705727fd 775 if (flags & DISSECT_IMAGE_MOUNT_ROOT_ONLY)
2d3a5a73 776 return 0;
8c1be37e 777
2d3a5a73 778 r = mount_partition(m->partitions + PARTITION_HOME, where, "/home", uid_shift, flags);
8c1be37e
LP		 779 if (r < 0)
780 return r;
781
2d3a5a73 782 r = mount_partition(m->partitions + PARTITION_SRV, where, "/srv", uid_shift, flags);
8c1be37e
LP		 783 if (r < 0)
784 return r;
785
786 if (m->partitions[PARTITION_ESP].found) {
2eedfd2d 787 const char *mp;
8c1be37e
LP		 788
789 /* Mount the ESP to /efi if it exists and is empty. If it doesn't exist, use /boot instead. */
790
2eedfd2d
LP		 791 FOREACH_STRING(mp, "/efi", "/boot") {
792 _cleanup_free_ char *p = NULL;
793
794 r = chase_symlinks(mp, where, CHASE_PREFIX_ROOT, &p);
8c1be37e 795 if (r < 0)
2eedfd2d
LP		 796 continue;
797
798 r = dir_is_empty(p);
799 if (r > 0) {
2d3a5a73 800 r = mount_partition(m->partitions + PARTITION_ESP, where, mp, uid_shift, flags);
2eedfd2d
LP		 801 if (r < 0)
802 return r;
803 }
8c1be37e
LP		 804 }
805 }
806
807 return 0;
808}
809
349cc4a5 810#if HAVE_LIBCRYPTSETUP
18b5886e
LP		 811typedef struct DecryptedPartition {
812 struct crypt_device *device;
813 char *name;
814 bool relinquished;
815} DecryptedPartition;
816
817struct DecryptedImage {
818 DecryptedPartition *decrypted;
819 size_t n_decrypted;
820 size_t n_allocated;
821};
822#endif
823
824DecryptedImage* decrypted_image_unref(DecryptedImage* d) {
349cc4a5 825#if HAVE_LIBCRYPTSETUP
18b5886e
LP		 826 size_t i;
827 int r;
828
829 if (!d)
830 return NULL;
831
832 for (i = 0; i < d->n_decrypted; i++) {
833 DecryptedPartition *p = d->decrypted + i;
834
835 if (p->device && p->name && !p->relinquished) {
836 r = crypt_deactivate(p->device, p->name);
837 if (r < 0)
838 log_debug_errno(r, "Failed to deactivate encrypted partition %s", p->name);
839 }
840
841 if (p->device)
842 crypt_free(p->device);
843 free(p->name);
844 }
845
846 free(d);
847#endif
848 return NULL;
849}
850
349cc4a5 851#if HAVE_LIBCRYPTSETUP
4623e8e6
LP		 852
853static int make_dm_name_and_node(const void *original_node, const char *suffix, char **ret_name, char **ret_node) {
854 _cleanup_free_ char *name = NULL, *node = NULL;
855 const char *base;
856
857 assert(original_node);
858 assert(suffix);
859 assert(ret_name);
860 assert(ret_node);
861
862 base = strrchr(original_node, '/');
863 if (!base)
864 return -EINVAL;
865 base++;
866 if (isempty(base))
867 return -EINVAL;
868
869 name = strjoin(base, suffix);
870 if (!name)
871 return -ENOMEM;
872 if (!filename_is_valid(name))
873 return -EINVAL;
874
875 node = strjoin(crypt_get_dir(), "/", name);
876 if (!node)
877 return -ENOMEM;
878
1cc6c93a
YW		 879 *ret_name = TAKE_PTR(name);
880 *ret_node = TAKE_PTR(node);
4623e8e6 881
4623e8e6
LP		 882 return 0;
883}
884
18b5886e
LP		 885static int decrypt_partition(
886 DissectedPartition *m,
887 const char *passphrase,
888 DissectImageFlags flags,
889 DecryptedImage *d) {
890
891 _cleanup_free_ char *node = NULL, *name = NULL;
294bd454 892 _cleanup_(crypt_freep) struct crypt_device *cd = NULL;
18b5886e
LP		 893 int r;
894
895 assert(m);
896 assert(d);
897
898 if (!m->found || !m->node || !m->fstype)
899 return 0;
900
901 if (!streq(m->fstype, "crypto_LUKS"))
902 return 0;
903
bdd73ac5
ZJS		 904 if (!passphrase)
905 return -ENOKEY;
906
4623e8e6
LP		 907 r = make_dm_name_and_node(m->node, "-decrypted", &name, &node);
908 if (r < 0)
909 return r;
18b5886e
LP		 910
911 if (!GREEDY_REALLOC0(d->decrypted, d->n_allocated, d->n_decrypted + 1))
912 return -ENOMEM;
913
914 r = crypt_init(&cd, m->node);
915 if (r < 0)
715cbb81 916 return log_debug_errno(r, "Failed to initialize dm-crypt: %m");
18b5886e 917
dd59868b 918 r = crypt_load(cd, CRYPT_LUKS, NULL);
294bd454
ZJS		 919 if (r < 0)
920 return log_debug_errno(r, "Failed to load LUKS metadata: %m");
18b5886e
LP		 921
922 r = crypt_activate_by_passphrase(cd, name, CRYPT_ANY_SLOT, passphrase, strlen(passphrase),
923 ((flags & DISSECT_IMAGE_READ_ONLY) ? CRYPT_ACTIVATE_READONLY : 0) |
924 ((flags & DISSECT_IMAGE_DISCARD_ON_CRYPTO) ? CRYPT_ACTIVATE_ALLOW_DISCARDS : 0));
294bd454 925 if (r < 0) {
715cbb81 926 log_debug_errno(r, "Failed to activate LUKS device: %m");
294bd454 927 return r == -EPERM ? -EKEYREJECTED : r;
18b5886e 928 }
18b5886e 929
1cc6c93a
YW		 930 d->decrypted[d->n_decrypted].name = TAKE_PTR(name);
931 d->decrypted[d->n_decrypted].device = TAKE_PTR(cd);
18b5886e
LP		 932 d->n_decrypted++;
933
1cc6c93a 934 m->decrypted_node = TAKE_PTR(node);
18b5886e
LP		 935
936 return 0;
4623e8e6
LP		 937}
938
939static int verity_partition(
940 DissectedPartition *m,
941 DissectedPartition *v,
942 const void *root_hash,
943 size_t root_hash_size,
944 DissectImageFlags flags,
945 DecryptedImage *d) {
946
947 _cleanup_free_ char *node = NULL, *name = NULL;
294bd454 948 _cleanup_(crypt_freep) struct crypt_device *cd = NULL;
4623e8e6
LP		 949 int r;
950
951 assert(m);
952 assert(v);
953
954 if (!root_hash)
955 return 0;
956
957 if (!m->found || !m->node || !m->fstype)
958 return 0;
959 if (!v->found || !v->node || !v->fstype)
960 return 0;
961
962 if (!streq(v->fstype, "DM_verity_hash"))
963 return 0;
964
965 r = make_dm_name_and_node(m->node, "-verity", &name, &node);
966 if (r < 0)
967 return r;
968
969 if (!GREEDY_REALLOC0(d->decrypted, d->n_allocated, d->n_decrypted + 1))
970 return -ENOMEM;
971
972 r = crypt_init(&cd, v->node);
973 if (r < 0)
974 return r;
975
976 r = crypt_load(cd, CRYPT_VERITY, NULL);
977 if (r < 0)
294bd454 978 return r;
4623e8e6
LP		 979
980 r = crypt_set_data_device(cd, m->node);
981 if (r < 0)
294bd454 982 return r;
4623e8e6
LP		 983
984 r = crypt_activate_by_volume_key(cd, name, root_hash, root_hash_size, CRYPT_ACTIVATE_READONLY);
985 if (r < 0)
294bd454 986 return r;
4623e8e6 987
1cc6c93a
YW		 988 d->decrypted[d->n_decrypted].name = TAKE_PTR(name);
989 d->decrypted[d->n_decrypted].device = TAKE_PTR(cd);
4623e8e6
LP		 990 d->n_decrypted++;
991
1cc6c93a 992 m->decrypted_node = TAKE_PTR(node);
4623e8e6
LP		 993
994 return 0;
18b5886e
LP		 995}
996#endif
997
998int dissected_image_decrypt(
999 DissectedImage *m,
1000 const char *passphrase,
4623e8e6
LP		 1001 const void *root_hash,
1002 size_t root_hash_size,
18b5886e
LP		 1003 DissectImageFlags flags,
1004 DecryptedImage **ret) {
1005
349cc4a5 1006#if HAVE_LIBCRYPTSETUP
49b5b3b4 1007 _cleanup_(decrypted_image_unrefp) DecryptedImage *d = NULL;
18b5886e
LP		 1008 unsigned i;
1009 int r;
1010#endif
1011
1012 assert(m);
4623e8e6 1013 assert(root_hash || root_hash_size == 0);
18b5886e
LP		 1014
1015 /* Returns:
1016 *
1017 * = 0 → There was nothing to decrypt
1018 * > 0 → Decrypted successfully
d1c536f5 1019 * -ENOKEY → There's something to decrypt but no key was supplied
18b5886e
LP		 1020 * -EKEYREJECTED → Passed key was not correct
1021 */
1022
4623e8e6
LP		 1023 if (root_hash && root_hash_size < sizeof(sd_id128_t))
1024 return -EINVAL;
1025
1026 if (!m->encrypted && !m->verity) {
18b5886e
LP		 1027 *ret = NULL;
1028 return 0;
1029 }
1030
349cc4a5 1031#if HAVE_LIBCRYPTSETUP
18b5886e
LP		 1032 d = new0(DecryptedImage, 1);
1033 if (!d)
1034 return -ENOMEM;
1035
1036 for (i = 0; i < _PARTITION_DESIGNATOR_MAX; i++) {
1037 DissectedPartition *p = m->partitions + i;
4623e8e6 1038 int k;
18b5886e
LP		 1039
1040 if (!p->found)
1041 continue;
1042
1043 r = decrypt_partition(p, passphrase, flags, d);
1044 if (r < 0)
1045 return r;
1046
4623e8e6
LP		 1047 k = PARTITION_VERITY_OF(i);
1048 if (k >= 0) {
1049 r = verity_partition(p, m->partitions + k, root_hash, root_hash_size, flags, d);
1050 if (r < 0)
1051 return r;
1052 }
1053
18b5886e
LP		 1054 if (!p->decrypted_fstype && p->decrypted_node) {
1055 r = probe_filesystem(p->decrypted_node, &p->decrypted_fstype);
7cc84b2c 1056 if (r < 0 && r != -EUCLEAN)
18b5886e
LP		 1057 return r;
1058 }
1059 }
1060
1cc6c93a 1061 *ret = TAKE_PTR(d);
18b5886e
LP		 1062
1063 return 1;
1064#else
1065 return -EOPNOTSUPP;
1066#endif
1067}
1068
1069int dissected_image_decrypt_interactively(
1070 DissectedImage *m,
1071 const char *passphrase,
4623e8e6
LP		 1072 const void *root_hash,
1073 size_t root_hash_size,
18b5886e
LP		 1074 DissectImageFlags flags,
1075 DecryptedImage **ret) {
1076
1077 _cleanup_strv_free_erase_ char **z = NULL;
1078 int n = 3, r;
1079
1080 if (passphrase)
1081 n--;
1082
1083 for (;;) {
4623e8e6 1084 r = dissected_image_decrypt(m, passphrase, root_hash, root_hash_size, flags, ret);
18b5886e
LP		 1085 if (r >= 0)
1086 return r;
1087 if (r == -EKEYREJECTED)
1088 log_error_errno(r, "Incorrect passphrase, try again!");
fc95c359
YW		 1089 else if (r != -ENOKEY)
1090 return log_error_errno(r, "Failed to decrypt image: %m");
18b5886e 1091
baaa35ad
ZJS		 1092 if (--n < 0)
1093 return log_error_errno(SYNTHETIC_ERRNO(EKEYREJECTED),
1094 "Too many retries.");
18b5886e
LP		 1095
1096 z = strv_free(z);
1097
a1c111c2 1098 r = ask_password_auto("Please enter image passphrase:", NULL, "dissect", "dissect", USEC_INFINITY, 0, &z);
18b5886e
LP		 1099 if (r < 0)
1100 return log_error_errno(r, "Failed to query for passphrase: %m");
1101
1102 passphrase = z[0];
1103 }
1104}
1105
349cc4a5 1106#if HAVE_LIBCRYPTSETUP
18b5886e
LP		 1107static int deferred_remove(DecryptedPartition *p) {
1108
1109 struct dm_ioctl dm = {
1110 .version = {
1111 DM_VERSION_MAJOR,
1112 DM_VERSION_MINOR,
1113 DM_VERSION_PATCHLEVEL
1114 },
1115 .data_size = sizeof(dm),
1116 .flags = DM_DEFERRED_REMOVE,
1117 };
1118
1119 _cleanup_close_ int fd = -1;
1120
1121 assert(p);
1122
1123 /* Unfortunately, libcryptsetup doesn't provide a proper API for this, hence call the ioctl() directly. */
1124
1125 fd = open("/dev/mapper/control", O_RDWR|O_CLOEXEC);
1126 if (fd < 0)
1127 return -errno;
1128
1129 strncpy(dm.name, p->name, sizeof(dm.name));
1130
1131 if (ioctl(fd, DM_DEV_REMOVE, &dm))
1132 return -errno;
1133
1134 return 0;
1135}
1136#endif
1137
1138int decrypted_image_relinquish(DecryptedImage *d) {
1139
349cc4a5 1140#if HAVE_LIBCRYPTSETUP
18b5886e
LP		 1141 size_t i;
1142 int r;
1143#endif
1144
1145 assert(d);
1146
1147 /* Turns on automatic removal after the last use ended for all DM devices of this image, and sets a boolean so
1148 * that we don't clean it up ourselves either anymore */
1149
349cc4a5 1150#if HAVE_LIBCRYPTSETUP
18b5886e
LP		 1151 for (i = 0; i < d->n_decrypted; i++) {
1152 DecryptedPartition *p = d->decrypted + i;
1153
1154 if (p->relinquished)
1155 continue;
1156
1157 r = deferred_remove(p);
1158 if (r < 0)
1159 return log_debug_errno(r, "Failed to mark %s for auto-removal: %m", p->name);
1160
1161 p->relinquished = true;
1162 }
1163#endif
1164
1165 return 0;
1166}
1167
78ebe980
LP		 1168int root_hash_load(const char *image, void **ret, size_t *ret_size) {
1169 _cleanup_free_ char *text = NULL;
1170 _cleanup_free_ void *k = NULL;
78ebe980
LP		 1171 size_t l;
1172 int r;
1173
1174 assert(image);
1175 assert(ret);
1176 assert(ret_size);
1177
1178 if (is_device_path(image)) {
1179 /* If we are asked to load the root hash for a device node, exit early */
1180 *ret = NULL;
1181 *ret_size = 0;
1182 return 0;
1183 }
1184
41488e1f
LP		 1185 r = getxattr_malloc(image, "user.verity.roothash", &text, true);
1186 if (r < 0) {
1187 char *fn, *e, *n;
78ebe980 1188
41488e1f
LP		 1189 if (!IN_SET(r, -ENODATA, -EOPNOTSUPP, -ENOENT))
1190 return r;
78ebe980 1191
fbd0b64f 1192 fn = newa(char, strlen(image) + STRLEN(".roothash") + 1);
41488e1f
LP		 1193 n = stpcpy(fn, image);
1194 e = endswith(fn, ".raw");
1195 if (e)
1196 n = e;
1197
1198 strcpy(n, ".roothash");
1199
1200 r = read_one_line_file(fn, &text);
1201 if (r == -ENOENT) {
1202 *ret = NULL;
1203 *ret_size = 0;
1204 return 0;
1205 }
1206 if (r < 0)
1207 return r;
78ebe980 1208 }
78ebe980
LP		 1209
1210 r = unhexmem(text, strlen(text), &k, &l);
1211 if (r < 0)
1212 return r;
1213 if (l < sizeof(sd_id128_t))
1214 return -EINVAL;
1215
1cc6c93a 1216 *ret = TAKE_PTR(k);
78ebe980
LP		 1217 *ret_size = l;
1218
78ebe980
LP		 1219 return 1;
1220}
1221
3b925504
LP		 1222int dissected_image_acquire_metadata(DissectedImage *m) {
1223
1224 enum {
1225 META_HOSTNAME,
1226 META_MACHINE_ID,
1227 META_MACHINE_INFO,
1228 META_OS_RELEASE,
1229 _META_MAX,
1230 };
1231
1232 static const char *const paths[_META_MAX] = {
1233 [META_HOSTNAME] = "/etc/hostname\0",
1234 [META_MACHINE_ID] = "/etc/machine-id\0",
1235 [META_MACHINE_INFO] = "/etc/machine-info\0",
1236 [META_OS_RELEASE] = "/etc/os-release\0/usr/lib/os-release\0",
1237 };
1238
1239 _cleanup_strv_free_ char **machine_info = NULL, **os_release = NULL;
1240 _cleanup_(rmdir_and_freep) char *t = NULL;
1241 _cleanup_(sigkill_waitp) pid_t child = 0;
1242 sd_id128_t machine_id = SD_ID128_NULL;
1243 _cleanup_free_ char *hostname = NULL;
1244 unsigned n_meta_initialized = 0, k;
1245 int fds[2 * _META_MAX], r;
3b925504
LP		 1246
1247 BLOCK_SIGNALS(SIGCHLD);
1248
1249 assert(m);
1250
1251 for (; n_meta_initialized < _META_MAX; n_meta_initialized ++)
1252 if (pipe2(fds + 2*n_meta_initialized, O_CLOEXEC) < 0) {
1253 r = -errno;
1254 goto finish;
1255 }
1256
1257 r = mkdtemp_malloc("/tmp/dissect-XXXXXX", &t);
1258 if (r < 0)
1259 goto finish;
1260
e2047ba9 1261 r = safe_fork("(sd-dissect)", FORK_RESET_SIGNALS|FORK_DEATHSIG|FORK_NEW_MOUNTNS|FORK_MOUNTNS_SLAVE, &child);
be39f6ee 1262 if (r < 0)
3b925504 1263 goto finish;
be39f6ee 1264 if (r == 0) {
03bcb6d4 1265 r = dissected_image_mount(m, t, UID_INVALID, DISSECT_IMAGE_READ_ONLY|DISSECT_IMAGE_MOUNT_ROOT_ONLY|DISSECT_IMAGE_VALIDATE_OS);
429d4e41
LP		 1266 if (r < 0) {
1267 log_debug_errno(r, "Failed to mount dissected image: %m");
3b925504 1268 _exit(EXIT_FAILURE);
429d4e41 1269 }
3b925504
LP		 1270
1271 for (k = 0; k < _META_MAX; k++) {
1272 _cleanup_close_ int fd = -1;
1273 const char *p;
1274
1275 fds[2*k] = safe_close(fds[2*k]);
1276
1277 NULSTR_FOREACH(p, paths[k]) {
36952d19 1278 fd = chase_symlinks_and_open(p, t, CHASE_PREFIX_ROOT, O_RDONLY|O_CLOEXEC|O_NOCTTY, NULL);
3b925504
LP		 1279 if (fd >= 0)
1280 break;
1281 }
36952d19
LP		 1282 if (fd < 0) {
1283 log_debug_errno(fd, "Failed to read %s file of image, ignoring: %m", paths[k]);
3b925504 1284 continue;
36952d19 1285 }
3b925504
LP		 1286
1287 r = copy_bytes(fd, fds[2*k+1], (uint64_t) -1, 0);
1288 if (r < 0)
1289 _exit(EXIT_FAILURE);
1290
1291 fds[2*k+1] = safe_close(fds[2*k+1]);
1292 }
1293
1294 _exit(EXIT_SUCCESS);
1295 }
1296
1297 for (k = 0; k < _META_MAX; k++) {
1298 _cleanup_fclose_ FILE *f = NULL;
1299
1300 fds[2*k+1] = safe_close(fds[2*k+1]);
1301
1302 f = fdopen(fds[2*k], "re");
1303 if (!f) {
1304 r = -errno;
1305 goto finish;
1306 }
1307
1308 fds[2*k] = -1;
1309
1310 switch (k) {
1311
1312 case META_HOSTNAME:
1313 r = read_etc_hostname_stream(f, &hostname);
1314 if (r < 0)
1315 log_debug_errno(r, "Failed to read /etc/hostname: %m");
1316
1317 break;
1318
1319 case META_MACHINE_ID: {
1320 _cleanup_free_ char *line = NULL;
1321
1322 r = read_line(f, LONG_LINE_MAX, &line);
1323 if (r < 0)
1324 log_debug_errno(r, "Failed to read /etc/machine-id: %m");
1325 else if (r == 33) {
1326 r = sd_id128_from_string(line, &machine_id);
1327 if (r < 0)
1328 log_debug_errno(r, "Image contains invalid /etc/machine-id: %s", line);
1329 } else if (r == 0)
1330 log_debug("/etc/machine-id file is empty.");
1331 else
1332 log_debug("/etc/machine-id has unexpected length %i.", r);
1333
1334 break;
1335 }
1336
1337 case META_MACHINE_INFO:
aa8fbc74 1338 r = load_env_file_pairs(f, "machine-info", &machine_info);
3b925504
LP		 1339 if (r < 0)
1340 log_debug_errno(r, "Failed to read /etc/machine-info: %m");
1341
1342 break;
1343
1344 case META_OS_RELEASE:
aa8fbc74 1345 r = load_env_file_pairs(f, "os-release", &os_release);
3b925504
LP		 1346 if (r < 0)
1347 log_debug_errno(r, "Failed to read OS release file: %m");
1348
1349 break;
1350 }
1351 }
1352
2e87a1fd 1353 r = wait_for_terminate_and_check("(sd-dissect)", child, 0);
3b925504 1354 child = 0;
2e87a1fd 1355 if (r < 0)
3b925504 1356 goto finish;
2e87a1fd
LP		 1357 if (r != EXIT_SUCCESS)
1358 return -EPROTO;
3b925504
LP		 1359
1360 free_and_replace(m->hostname, hostname);
1361 m->machine_id = machine_id;
1362 strv_free_and_replace(m->machine_info, machine_info);
1363 strv_free_and_replace(m->os_release, os_release);
1364
1365finish:
1366 for (k = 0; k < n_meta_initialized; k++)
1367 safe_close_pair(fds + 2*k);
1368
1369 return r;
1370}
1371
4526113f
LP		 1372int dissect_image_and_warn(
1373 int fd,
1374 const char *name,
1375 const void *root_hash,
1376 size_t root_hash_size,
1377 DissectImageFlags flags,
1378 DissectedImage **ret) {
1379
1380 _cleanup_free_ char *buffer = NULL;
1381 int r;
1382
1383 if (!name) {
1384 r = fd_get_path(fd, &buffer);
1385 if (r < 0)
1386 return r;
1387
1388 name = buffer;
1389 }
1390
1391 r = dissect_image(fd, root_hash, root_hash_size, flags, ret);
1392
1393 switch (r) {
1394
1395 case -EOPNOTSUPP:
1396 return log_error_errno(r, "Dissecting images is not supported, compiled without blkid support.");
1397
1398 case -ENOPKG:
1399 return log_error_errno(r, "Couldn't identify a suitable partition table or file system in '%s'.", name);
1400
1401 case -EADDRNOTAVAIL:
1402 return log_error_errno(r, "No root partition for specified root hash found in '%s'.", name);
1403
1404 case -ENOTUNIQ:
1405 return log_error_errno(r, "Multiple suitable root partitions found in image '%s'.", name);
1406
1407 case -ENXIO:
1408 return log_error_errno(r, "No suitable root partition found in image '%s'.", name);
1409
1410 case -EPROTONOSUPPORT:
1411 return log_error_errno(r, "Device '%s' is loopback block device with partition scanning turned off, please turn it on.", name);
1412
1413 default:
1414 if (r < 0)
1415 return log_error_errno(r, "Failed to dissect image '%s': %m", name);
1416
1417 return r;
1418 }
1419}
1420
8c1be37e
LP		 1421static const char *const partition_designator_table[] = {
1422 [PARTITION_ROOT] = "root",
1423 [PARTITION_ROOT_SECONDARY] = "root-secondary",
1424 [PARTITION_HOME] = "home",
1425 [PARTITION_SRV] = "srv",
1426 [PARTITION_ESP] = "esp",
1427 [PARTITION_SWAP] = "swap",
4623e8e6
LP		 1428 [PARTITION_ROOT_VERITY] = "root-verity",
1429 [PARTITION_ROOT_SECONDARY_VERITY] = "root-secondary-verity",
8c1be37e
LP		 1430};
1431
1432DEFINE_STRING_TABLE_LOOKUP(partition_designator, int);
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