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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
8c1be37e LP |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright 2016 Lennart Poettering | |
6 | ||
7 | systemd is free software; you can redistribute it and/or modify it | |
8 | under the terms of the GNU Lesser General Public License as published by | |
9 | the Free Software Foundation; either version 2.1 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | systemd is distributed in the hope that it will be useful, but | |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | Lesser General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU Lesser General Public License | |
18 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
19 | ***/ | |
20 | ||
21 | #include <sys/mount.h> | |
3b925504 LP |
22 | #include <sys/prctl.h> |
23 | #include <sys/wait.h> | |
8c1be37e | 24 | |
dccca82b LP |
25 | #include "sd-id128.h" |
26 | ||
8c1be37e | 27 | #include "architecture.h" |
18b5886e | 28 | #include "ask-password-api.h" |
8c1be37e | 29 | #include "blkid-util.h" |
18c528e9 | 30 | #include "blockdev-util.h" |
3b925504 | 31 | #include "copy.h" |
294bd454 | 32 | #include "crypt-util.h" |
3b925504 | 33 | #include "def.h" |
553e15f2 | 34 | #include "device-nodes.h" |
8c1be37e | 35 | #include "dissect-image.h" |
18b5886e | 36 | #include "fd-util.h" |
78ebe980 | 37 | #include "fileio.h" |
2eedfd2d | 38 | #include "fs-util.h" |
8c1be37e | 39 | #include "gpt.h" |
78ebe980 | 40 | #include "hexdecoct.h" |
3b925504 LP |
41 | #include "hostname-util.h" |
42 | #include "id128-util.h" | |
dcce98a4 | 43 | #include "linux-3.13/dm-ioctl.h" |
ffc01f06 | 44 | #include "missing.h" |
8c1be37e LP |
45 | #include "mount-util.h" |
46 | #include "path-util.h" | |
3b925504 LP |
47 | #include "process-util.h" |
48 | #include "raw-clone.h" | |
49 | #include "signal-util.h" | |
8c1be37e | 50 | #include "stat-util.h" |
18b5886e | 51 | #include "stdio-util.h" |
8c1be37e LP |
52 | #include "string-table.h" |
53 | #include "string-util.h" | |
2eedfd2d | 54 | #include "strv.h" |
8c1be37e | 55 | #include "udev-util.h" |
2d3a5a73 | 56 | #include "user-util.h" |
41488e1f | 57 | #include "xattr-util.h" |
8c1be37e | 58 | |
c34b75a1 | 59 | int probe_filesystem(const char *node, char **ret_fstype) { |
7cc84b2c ZJS |
60 | /* Try to find device content type and return it in *ret_fstype. If nothing is found, |
61 | * 0/NULL will be returned. -EUCLEAN will be returned for ambigous results, and an | |
62 | * different error otherwise. */ | |
63 | ||
349cc4a5 | 64 | #if HAVE_BLKID |
18b5886e LP |
65 | _cleanup_blkid_free_probe_ blkid_probe b = NULL; |
66 | const char *fstype; | |
67 | int r; | |
68 | ||
995fa2e5 | 69 | errno = 0; |
18b5886e LP |
70 | b = blkid_new_probe_from_filename(node); |
71 | if (!b) | |
995fa2e5 | 72 | return -errno ?: -ENOMEM; |
18b5886e LP |
73 | |
74 | blkid_probe_enable_superblocks(b, 1); | |
75 | blkid_probe_set_superblocks_flags(b, BLKID_SUBLKS_TYPE); | |
76 | ||
77 | errno = 0; | |
78 | r = blkid_do_safeprobe(b); | |
7cc84b2c ZJS |
79 | if (r == 1) { |
80 | log_debug("No type detected on partition %s", node); | |
18b5886e LP |
81 | goto not_found; |
82 | } | |
7cc84b2c ZJS |
83 | if (r == -2) { |
84 | log_debug("Results ambiguous for partition %s", node); | |
85 | return -EUCLEAN; | |
86 | } | |
b382db9f ZJS |
87 | if (r != 0) |
88 | return -errno ?: -EIO; | |
18b5886e LP |
89 | |
90 | (void) blkid_probe_lookup_value(b, "TYPE", &fstype, NULL); | |
91 | ||
92 | if (fstype) { | |
93 | char *t; | |
94 | ||
95 | t = strdup(fstype); | |
96 | if (!t) | |
97 | return -ENOMEM; | |
98 | ||
99 | *ret_fstype = t; | |
100 | return 1; | |
101 | } | |
102 | ||
103 | not_found: | |
104 | *ret_fstype = NULL; | |
105 | return 0; | |
d1c536f5 ZJS |
106 | #else |
107 | return -EOPNOTSUPP; | |
a75e27eb | 108 | #endif |
d1c536f5 | 109 | } |
18b5886e | 110 | |
4526113f LP |
111 | int dissect_image( |
112 | int fd, | |
113 | const void *root_hash, | |
114 | size_t root_hash_size, | |
115 | DissectImageFlags flags, | |
116 | DissectedImage **ret) { | |
8c1be37e | 117 | |
349cc4a5 | 118 | #if HAVE_BLKID |
4623e8e6 | 119 | sd_id128_t root_uuid = SD_ID128_NULL, verity_uuid = SD_ID128_NULL; |
8c1be37e LP |
120 | _cleanup_udev_enumerate_unref_ struct udev_enumerate *e = NULL; |
121 | bool is_gpt, is_mbr, generic_rw, multiple_generic = false; | |
122 | _cleanup_udev_device_unref_ struct udev_device *d = NULL; | |
123 | _cleanup_(dissected_image_unrefp) DissectedImage *m = NULL; | |
124 | _cleanup_blkid_free_probe_ blkid_probe b = NULL; | |
125 | _cleanup_udev_unref_ struct udev *udev = NULL; | |
126 | _cleanup_free_ char *generic_node = NULL; | |
be30ad41 | 127 | sd_id128_t generic_uuid = SD_ID128_NULL; |
9b6deb03 | 128 | const char *pttype = NULL; |
8c1be37e LP |
129 | struct udev_list_entry *first, *item; |
130 | blkid_partlist pl; | |
131 | int r, generic_nr; | |
132 | struct stat st; | |
133 | unsigned i; | |
134 | ||
135 | assert(fd >= 0); | |
136 | assert(ret); | |
4623e8e6 | 137 | assert(root_hash || root_hash_size == 0); |
8c1be37e LP |
138 | |
139 | /* Probes a disk image, and returns information about what it found in *ret. | |
140 | * | |
4623e8e6 LP |
141 | * Returns -ENOPKG if no suitable partition table or file system could be found. |
142 | * Returns -EADDRNOTAVAIL if a root hash was specified but no matching root/verity partitions found. */ | |
143 | ||
144 | if (root_hash) { | |
145 | /* If a root hash is supplied, then we use the root partition that has a UUID that match the first | |
146 | * 128bit of the root hash. And we use the verity partition that has a UUID that match the final | |
147 | * 128bit. */ | |
148 | ||
149 | if (root_hash_size < sizeof(sd_id128_t)) | |
150 | return -EINVAL; | |
151 | ||
152 | memcpy(&root_uuid, root_hash, sizeof(sd_id128_t)); | |
153 | memcpy(&verity_uuid, (const uint8_t*) root_hash + root_hash_size - sizeof(sd_id128_t), sizeof(sd_id128_t)); | |
154 | ||
155 | if (sd_id128_is_null(root_uuid)) | |
156 | return -EINVAL; | |
157 | if (sd_id128_is_null(verity_uuid)) | |
158 | return -EINVAL; | |
159 | } | |
8c1be37e LP |
160 | |
161 | if (fstat(fd, &st) < 0) | |
162 | return -errno; | |
163 | ||
164 | if (!S_ISBLK(st.st_mode)) | |
165 | return -ENOTBLK; | |
166 | ||
167 | b = blkid_new_probe(); | |
168 | if (!b) | |
169 | return -ENOMEM; | |
170 | ||
171 | errno = 0; | |
172 | r = blkid_probe_set_device(b, fd, 0, 0); | |
b382db9f ZJS |
173 | if (r != 0) |
174 | return -errno ?: -ENOMEM; | |
8c1be37e | 175 | |
9b6deb03 LP |
176 | if ((flags & DISSECT_IMAGE_GPT_ONLY) == 0) { |
177 | /* Look for file system superblocks, unless we only shall look for GPT partition tables */ | |
178 | blkid_probe_enable_superblocks(b, 1); | |
179 | blkid_probe_set_superblocks_flags(b, BLKID_SUBLKS_TYPE|BLKID_SUBLKS_USAGE); | |
180 | } | |
181 | ||
8c1be37e LP |
182 | blkid_probe_enable_partitions(b, 1); |
183 | blkid_probe_set_partitions_flags(b, BLKID_PARTS_ENTRY_DETAILS); | |
184 | ||
185 | errno = 0; | |
186 | r = blkid_do_safeprobe(b); | |
4c701096 | 187 | if (IN_SET(r, -2, 1)) { |
8c1be37e LP |
188 | log_debug("Failed to identify any partition table."); |
189 | return -ENOPKG; | |
190 | } | |
b382db9f ZJS |
191 | if (r != 0) |
192 | return -errno ?: -EIO; | |
8c1be37e LP |
193 | |
194 | m = new0(DissectedImage, 1); | |
195 | if (!m) | |
196 | return -ENOMEM; | |
197 | ||
e0f9e7bd LP |
198 | if (!(flags & DISSECT_IMAGE_GPT_ONLY) && |
199 | (flags & DISSECT_IMAGE_REQUIRE_ROOT)) { | |
9b6deb03 | 200 | const char *usage = NULL; |
8c1be37e | 201 | |
9b6deb03 LP |
202 | (void) blkid_probe_lookup_value(b, "USAGE", &usage, NULL); |
203 | if (STRPTR_IN_SET(usage, "filesystem", "crypto")) { | |
204 | _cleanup_free_ char *t = NULL, *n = NULL; | |
205 | const char *fstype = NULL; | |
8c1be37e | 206 | |
9b6deb03 LP |
207 | /* OK, we have found a file system, that's our root partition then. */ |
208 | (void) blkid_probe_lookup_value(b, "TYPE", &fstype, NULL); | |
8c1be37e | 209 | |
9b6deb03 LP |
210 | if (fstype) { |
211 | t = strdup(fstype); | |
212 | if (!t) | |
213 | return -ENOMEM; | |
214 | } | |
215 | ||
216 | if (asprintf(&n, "/dev/block/%u:%u", major(st.st_rdev), minor(st.st_rdev)) < 0) | |
217 | return -ENOMEM; | |
8c1be37e | 218 | |
9b6deb03 LP |
219 | m->partitions[PARTITION_ROOT] = (DissectedPartition) { |
220 | .found = true, | |
221 | .rw = true, | |
222 | .partno = -1, | |
223 | .architecture = _ARCHITECTURE_INVALID, | |
224 | .fstype = t, | |
225 | .node = n, | |
226 | }; | |
8c1be37e | 227 | |
9b6deb03 | 228 | t = n = NULL; |
8c1be37e | 229 | |
9b6deb03 | 230 | m->encrypted = streq(fstype, "crypto_LUKS"); |
18b5886e | 231 | |
9b6deb03 LP |
232 | *ret = m; |
233 | m = NULL; | |
8c1be37e | 234 | |
9b6deb03 LP |
235 | return 0; |
236 | } | |
8c1be37e LP |
237 | } |
238 | ||
239 | (void) blkid_probe_lookup_value(b, "PTTYPE", &pttype, NULL); | |
240 | if (!pttype) | |
241 | return -ENOPKG; | |
242 | ||
243 | is_gpt = streq_ptr(pttype, "gpt"); | |
244 | is_mbr = streq_ptr(pttype, "dos"); | |
245 | ||
9b6deb03 | 246 | if (!is_gpt && ((flags & DISSECT_IMAGE_GPT_ONLY) || !is_mbr)) |
8c1be37e LP |
247 | return -ENOPKG; |
248 | ||
249 | errno = 0; | |
250 | pl = blkid_probe_get_partitions(b); | |
b382db9f ZJS |
251 | if (!pl) |
252 | return -errno ?: -ENOMEM; | |
8c1be37e LP |
253 | |
254 | udev = udev_new(); | |
255 | if (!udev) | |
256 | return -errno; | |
257 | ||
258 | d = udev_device_new_from_devnum(udev, 'b', st.st_rdev); | |
259 | if (!d) | |
260 | return -ENOMEM; | |
261 | ||
262 | for (i = 0;; i++) { | |
263 | int n, z; | |
264 | ||
265 | if (i >= 10) { | |
266 | log_debug("Kernel partitions never appeared."); | |
267 | return -ENXIO; | |
268 | } | |
269 | ||
270 | e = udev_enumerate_new(udev); | |
271 | if (!e) | |
272 | return -errno; | |
273 | ||
274 | r = udev_enumerate_add_match_parent(e, d); | |
275 | if (r < 0) | |
276 | return r; | |
277 | ||
278 | r = udev_enumerate_scan_devices(e); | |
279 | if (r < 0) | |
280 | return r; | |
281 | ||
282 | /* Count the partitions enumerated by the kernel */ | |
283 | n = 0; | |
284 | first = udev_enumerate_get_list_entry(e); | |
285 | udev_list_entry_foreach(item, first) | |
286 | n++; | |
287 | ||
288 | /* Count the partitions enumerated by blkid */ | |
289 | z = blkid_partlist_numof_partitions(pl); | |
290 | if (n == z + 1) | |
291 | break; | |
292 | if (n > z + 1) { | |
293 | log_debug("blkid and kernel partition list do not match."); | |
294 | return -EIO; | |
295 | } | |
296 | if (n < z + 1) { | |
759aaedc | 297 | unsigned j = 0; |
8c1be37e LP |
298 | |
299 | /* The kernel has probed fewer partitions than blkid? Maybe the kernel prober is still running | |
300 | * or it got EBUSY because udev already opened the device. Let's reprobe the device, which is a | |
301 | * synchronous call that waits until probing is complete. */ | |
302 | ||
759aaedc LP |
303 | for (;;) { |
304 | if (j++ > 20) | |
305 | return -EBUSY; | |
8c1be37e | 306 | |
759aaedc | 307 | if (ioctl(fd, BLKRRPART, 0) < 0) { |
8c1be37e | 308 | r = -errno; |
759aaedc LP |
309 | |
310 | if (r == -EINVAL) { | |
311 | struct loop_info64 info; | |
312 | ||
313 | /* If we are running on a loop device that has partition scanning off, | |
314 | * return an explicit recognizable error about this, so that callers | |
315 | * can generate a proper message explaining the situation. */ | |
316 | ||
317 | if (ioctl(fd, LOOP_GET_STATUS64, &info) >= 0 && (info.lo_flags & LO_FLAGS_PARTSCAN) == 0) { | |
318 | log_debug("Device is loop device and partition scanning is off!"); | |
319 | return -EPROTONOSUPPORT; | |
320 | } | |
321 | } | |
322 | if (r != -EBUSY) | |
323 | return r; | |
324 | } else | |
8c1be37e LP |
325 | break; |
326 | ||
327 | /* If something else has the device open, such as an udev rule, the ioctl will return | |
328 | * EBUSY. Since there's no way to wait until it isn't busy anymore, let's just wait a | |
329 | * bit, and try again. | |
330 | * | |
331 | * This is really something they should fix in the kernel! */ | |
332 | ||
759aaedc | 333 | (void) usleep(50 * USEC_PER_MSEC); |
8c1be37e | 334 | } |
8c1be37e LP |
335 | } |
336 | ||
337 | e = udev_enumerate_unref(e); | |
338 | } | |
339 | ||
340 | first = udev_enumerate_get_list_entry(e); | |
341 | udev_list_entry_foreach(item, first) { | |
342 | _cleanup_udev_device_unref_ struct udev_device *q; | |
9b6deb03 | 343 | unsigned long long pflags; |
8c1be37e | 344 | blkid_partition pp; |
7be1420f | 345 | const char *node, *sysname; |
8c1be37e LP |
346 | dev_t qn; |
347 | int nr; | |
348 | ||
349 | q = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item)); | |
350 | if (!q) | |
351 | return -errno; | |
352 | ||
353 | qn = udev_device_get_devnum(q); | |
354 | if (major(qn) == 0) | |
355 | continue; | |
356 | ||
357 | if (st.st_rdev == qn) | |
358 | continue; | |
359 | ||
7be1420f LP |
360 | /* Filter out weird MMC RPMB partitions, which cannot reasonably be read, see |
361 | * https://github.com/systemd/systemd/issues/5806 */ | |
362 | sysname = udev_device_get_sysname(q); | |
a3a3b613 NC |
363 | if (sysname && startswith(sysname, "mmcblk") && |
364 | (endswith(sysname, "rpmb") || endswith(sysname, "boot0" ) || endswith(sysname, "boot1"))) | |
7be1420f LP |
365 | continue; |
366 | ||
8c1be37e LP |
367 | node = udev_device_get_devnode(q); |
368 | if (!node) | |
369 | continue; | |
370 | ||
371 | pp = blkid_partlist_devno_to_partition(pl, qn); | |
372 | if (!pp) | |
373 | continue; | |
374 | ||
9b6deb03 | 375 | pflags = blkid_partition_get_flags(pp); |
8c1be37e LP |
376 | |
377 | nr = blkid_partition_get_partno(pp); | |
378 | if (nr < 0) | |
379 | continue; | |
380 | ||
381 | if (is_gpt) { | |
382 | int designator = _PARTITION_DESIGNATOR_INVALID, architecture = _ARCHITECTURE_INVALID; | |
4623e8e6 LP |
383 | const char *stype, *sid, *fstype = NULL; |
384 | sd_id128_t type_id, id; | |
8c1be37e LP |
385 | bool rw = true; |
386 | ||
4623e8e6 LP |
387 | sid = blkid_partition_get_uuid(pp); |
388 | if (!sid) | |
389 | continue; | |
390 | if (sd_id128_from_string(sid, &id) < 0) | |
391 | continue; | |
392 | ||
8c1be37e LP |
393 | stype = blkid_partition_get_type_string(pp); |
394 | if (!stype) | |
395 | continue; | |
8c1be37e LP |
396 | if (sd_id128_from_string(stype, &type_id) < 0) |
397 | continue; | |
398 | ||
399 | if (sd_id128_equal(type_id, GPT_HOME)) { | |
a48dd347 LP |
400 | |
401 | if (pflags & GPT_FLAG_NO_AUTO) | |
402 | continue; | |
403 | ||
8c1be37e | 404 | designator = PARTITION_HOME; |
9b6deb03 | 405 | rw = !(pflags & GPT_FLAG_READ_ONLY); |
8c1be37e | 406 | } else if (sd_id128_equal(type_id, GPT_SRV)) { |
a48dd347 LP |
407 | |
408 | if (pflags & GPT_FLAG_NO_AUTO) | |
409 | continue; | |
410 | ||
8c1be37e | 411 | designator = PARTITION_SRV; |
9b6deb03 | 412 | rw = !(pflags & GPT_FLAG_READ_ONLY); |
8c1be37e | 413 | } else if (sd_id128_equal(type_id, GPT_ESP)) { |
a48dd347 LP |
414 | |
415 | /* Note that we don't check the GPT_FLAG_NO_AUTO flag for the ESP, as it is not defined | |
416 | * there. We instead check the GPT_FLAG_NO_BLOCK_IO_PROTOCOL, as recommended by the | |
417 | * UEFI spec (See "12.3.3 Number and Location of System Partitions"). */ | |
418 | ||
419 | if (pflags & GPT_FLAG_NO_BLOCK_IO_PROTOCOL) | |
420 | continue; | |
421 | ||
8c1be37e LP |
422 | designator = PARTITION_ESP; |
423 | fstype = "vfat"; | |
424 | } | |
425 | #ifdef GPT_ROOT_NATIVE | |
426 | else if (sd_id128_equal(type_id, GPT_ROOT_NATIVE)) { | |
4623e8e6 | 427 | |
a48dd347 LP |
428 | if (pflags & GPT_FLAG_NO_AUTO) |
429 | continue; | |
430 | ||
4623e8e6 LP |
431 | /* If a root ID is specified, ignore everything but the root id */ |
432 | if (!sd_id128_is_null(root_uuid) && !sd_id128_equal(root_uuid, id)) | |
433 | continue; | |
434 | ||
8c1be37e LP |
435 | designator = PARTITION_ROOT; |
436 | architecture = native_architecture(); | |
9b6deb03 | 437 | rw = !(pflags & GPT_FLAG_READ_ONLY); |
4f8b86e3 | 438 | } else if (sd_id128_equal(type_id, GPT_ROOT_NATIVE_VERITY)) { |
4623e8e6 | 439 | |
a48dd347 LP |
440 | if (pflags & GPT_FLAG_NO_AUTO) |
441 | continue; | |
442 | ||
4623e8e6 LP |
443 | m->can_verity = true; |
444 | ||
445 | /* Ignore verity unless a root hash is specified */ | |
446 | if (sd_id128_is_null(verity_uuid) || !sd_id128_equal(verity_uuid, id)) | |
447 | continue; | |
448 | ||
449 | designator = PARTITION_ROOT_VERITY; | |
450 | fstype = "DM_verity_hash"; | |
451 | architecture = native_architecture(); | |
452 | rw = false; | |
453 | } | |
454 | #endif | |
8c1be37e LP |
455 | #ifdef GPT_ROOT_SECONDARY |
456 | else if (sd_id128_equal(type_id, GPT_ROOT_SECONDARY)) { | |
4623e8e6 | 457 | |
a48dd347 LP |
458 | if (pflags & GPT_FLAG_NO_AUTO) |
459 | continue; | |
460 | ||
4623e8e6 LP |
461 | /* If a root ID is specified, ignore everything but the root id */ |
462 | if (!sd_id128_is_null(root_uuid) && !sd_id128_equal(root_uuid, id)) | |
463 | continue; | |
464 | ||
8c1be37e LP |
465 | designator = PARTITION_ROOT_SECONDARY; |
466 | architecture = SECONDARY_ARCHITECTURE; | |
9b6deb03 | 467 | rw = !(pflags & GPT_FLAG_READ_ONLY); |
4f8b86e3 | 468 | } else if (sd_id128_equal(type_id, GPT_ROOT_SECONDARY_VERITY)) { |
a48dd347 LP |
469 | |
470 | if (pflags & GPT_FLAG_NO_AUTO) | |
471 | continue; | |
472 | ||
4623e8e6 LP |
473 | m->can_verity = true; |
474 | ||
475 | /* Ignore verity unless root has is specified */ | |
476 | if (sd_id128_is_null(verity_uuid) || !sd_id128_equal(verity_uuid, id)) | |
477 | continue; | |
478 | ||
479 | designator = PARTITION_ROOT_SECONDARY_VERITY; | |
480 | fstype = "DM_verity_hash"; | |
481 | architecture = SECONDARY_ARCHITECTURE; | |
482 | rw = false; | |
483 | } | |
8c1be37e LP |
484 | #endif |
485 | else if (sd_id128_equal(type_id, GPT_SWAP)) { | |
a48dd347 LP |
486 | |
487 | if (pflags & GPT_FLAG_NO_AUTO) | |
488 | continue; | |
489 | ||
8c1be37e LP |
490 | designator = PARTITION_SWAP; |
491 | fstype = "swap"; | |
492 | } else if (sd_id128_equal(type_id, GPT_LINUX_GENERIC)) { | |
493 | ||
a48dd347 LP |
494 | if (pflags & GPT_FLAG_NO_AUTO) |
495 | continue; | |
496 | ||
8c1be37e LP |
497 | if (generic_node) |
498 | multiple_generic = true; | |
499 | else { | |
500 | generic_nr = nr; | |
9b6deb03 | 501 | generic_rw = !(pflags & GPT_FLAG_READ_ONLY); |
be30ad41 | 502 | generic_uuid = id; |
8c1be37e LP |
503 | generic_node = strdup(node); |
504 | if (!generic_node) | |
505 | return -ENOMEM; | |
506 | } | |
507 | } | |
508 | ||
509 | if (designator != _PARTITION_DESIGNATOR_INVALID) { | |
510 | _cleanup_free_ char *t = NULL, *n = NULL; | |
511 | ||
512 | /* First one wins */ | |
513 | if (m->partitions[designator].found) | |
514 | continue; | |
515 | ||
516 | if (fstype) { | |
517 | t = strdup(fstype); | |
518 | if (!t) | |
519 | return -ENOMEM; | |
520 | } | |
521 | ||
522 | n = strdup(node); | |
523 | if (!n) | |
524 | return -ENOMEM; | |
525 | ||
526 | m->partitions[designator] = (DissectedPartition) { | |
527 | .found = true, | |
528 | .partno = nr, | |
529 | .rw = rw, | |
530 | .architecture = architecture, | |
531 | .node = n, | |
532 | .fstype = t, | |
be30ad41 | 533 | .uuid = id, |
8c1be37e LP |
534 | }; |
535 | ||
536 | n = t = NULL; | |
537 | } | |
538 | ||
539 | } else if (is_mbr) { | |
540 | ||
9b6deb03 | 541 | if (pflags != 0x80) /* Bootable flag */ |
8c1be37e LP |
542 | continue; |
543 | ||
544 | if (blkid_partition_get_type(pp) != 0x83) /* Linux partition */ | |
545 | continue; | |
546 | ||
547 | if (generic_node) | |
548 | multiple_generic = true; | |
549 | else { | |
550 | generic_nr = nr; | |
551 | generic_rw = true; | |
552 | generic_node = strdup(node); | |
553 | if (!generic_node) | |
554 | return -ENOMEM; | |
555 | } | |
556 | } | |
557 | } | |
558 | ||
559 | if (!m->partitions[PARTITION_ROOT].found) { | |
560 | /* No root partition found? Then let's see if ther's one for the secondary architecture. And if not | |
561 | * either, then check if there's a single generic one, and use that. */ | |
562 | ||
4623e8e6 | 563 | if (m->partitions[PARTITION_ROOT_VERITY].found) |
e0f9e7bd | 564 | return -EADDRNOTAVAIL; |
4623e8e6 | 565 | |
8c1be37e LP |
566 | if (m->partitions[PARTITION_ROOT_SECONDARY].found) { |
567 | m->partitions[PARTITION_ROOT] = m->partitions[PARTITION_ROOT_SECONDARY]; | |
568 | zero(m->partitions[PARTITION_ROOT_SECONDARY]); | |
4623e8e6 LP |
569 | |
570 | m->partitions[PARTITION_ROOT_VERITY] = m->partitions[PARTITION_ROOT_SECONDARY_VERITY]; | |
571 | zero(m->partitions[PARTITION_ROOT_SECONDARY_VERITY]); | |
572 | ||
e0f9e7bd LP |
573 | } else if (flags & DISSECT_IMAGE_REQUIRE_ROOT) { |
574 | ||
575 | /* If the root has was set, then we won't fallback to a generic node, because the root hash | |
576 | * decides */ | |
577 | if (root_hash) | |
578 | return -EADDRNOTAVAIL; | |
8c1be37e | 579 | |
e0f9e7bd LP |
580 | /* If we didn't find a generic node, then we can't fix this up either */ |
581 | if (!generic_node) | |
582 | return -ENXIO; | |
583 | ||
584 | /* If we didn't find a properly marked root partition, but we did find a single suitable | |
585 | * generic Linux partition, then use this as root partition, if the caller asked for it. */ | |
8c1be37e LP |
586 | if (multiple_generic) |
587 | return -ENOTUNIQ; | |
588 | ||
589 | m->partitions[PARTITION_ROOT] = (DissectedPartition) { | |
590 | .found = true, | |
591 | .rw = generic_rw, | |
592 | .partno = generic_nr, | |
593 | .architecture = _ARCHITECTURE_INVALID, | |
594 | .node = generic_node, | |
be30ad41 | 595 | .uuid = generic_uuid, |
8c1be37e LP |
596 | }; |
597 | ||
598 | generic_node = NULL; | |
e0f9e7bd | 599 | } |
8c1be37e LP |
600 | } |
601 | ||
4623e8e6 | 602 | if (root_hash) { |
e0f9e7bd | 603 | if (!m->partitions[PARTITION_ROOT_VERITY].found || !m->partitions[PARTITION_ROOT].found) |
4623e8e6 LP |
604 | return -EADDRNOTAVAIL; |
605 | ||
606 | /* If we found the primary root with the hash, then we definitely want to suppress any secondary root | |
607 | * (which would be weird, after all the root hash should only be assigned to one pair of | |
608 | * partitions... */ | |
609 | m->partitions[PARTITION_ROOT_SECONDARY].found = false; | |
610 | m->partitions[PARTITION_ROOT_SECONDARY_VERITY].found = false; | |
611 | ||
612 | /* If we found a verity setup, then the root partition is necessarily read-only. */ | |
613 | m->partitions[PARTITION_ROOT].rw = false; | |
614 | ||
615 | m->verity = true; | |
616 | } | |
617 | ||
18b5886e LP |
618 | blkid_free_probe(b); |
619 | b = NULL; | |
620 | ||
8c1be37e LP |
621 | /* Fill in file system types if we don't know them yet. */ |
622 | for (i = 0; i < _PARTITION_DESIGNATOR_MAX; i++) { | |
18b5886e | 623 | DissectedPartition *p = m->partitions + i; |
8c1be37e | 624 | |
18b5886e | 625 | if (!p->found) |
8c1be37e LP |
626 | continue; |
627 | ||
18b5886e LP |
628 | if (!p->fstype && p->node) { |
629 | r = probe_filesystem(p->node, &p->fstype); | |
7cc84b2c | 630 | if (r < 0 && r != -EUCLEAN) |
18b5886e | 631 | return r; |
8c1be37e LP |
632 | } |
633 | ||
18b5886e LP |
634 | if (streq_ptr(p->fstype, "crypto_LUKS")) |
635 | m->encrypted = true; | |
896f937f LP |
636 | |
637 | if (p->fstype && fstype_is_ro(p->fstype)) | |
638 | p->rw = false; | |
8c1be37e LP |
639 | } |
640 | ||
641 | *ret = m; | |
642 | m = NULL; | |
643 | ||
644 | return 0; | |
645 | #else | |
646 | return -EOPNOTSUPP; | |
647 | #endif | |
648 | } | |
649 | ||
650 | DissectedImage* dissected_image_unref(DissectedImage *m) { | |
651 | unsigned i; | |
652 | ||
653 | if (!m) | |
654 | return NULL; | |
655 | ||
656 | for (i = 0; i < _PARTITION_DESIGNATOR_MAX; i++) { | |
657 | free(m->partitions[i].fstype); | |
658 | free(m->partitions[i].node); | |
18b5886e LP |
659 | free(m->partitions[i].decrypted_fstype); |
660 | free(m->partitions[i].decrypted_node); | |
8c1be37e LP |
661 | } |
662 | ||
3b925504 LP |
663 | free(m->hostname); |
664 | strv_free(m->machine_info); | |
665 | strv_free(m->os_release); | |
666 | ||
5fecf46d | 667 | return mfree(m); |
8c1be37e LP |
668 | } |
669 | ||
18b5886e | 670 | static int is_loop_device(const char *path) { |
553e15f2 | 671 | char s[SYS_BLOCK_PATH_MAX("/../loop/")]; |
18b5886e LP |
672 | struct stat st; |
673 | ||
674 | assert(path); | |
675 | ||
676 | if (stat(path, &st) < 0) | |
677 | return -errno; | |
678 | ||
679 | if (!S_ISBLK(st.st_mode)) | |
680 | return -ENOTBLK; | |
681 | ||
553e15f2 | 682 | xsprintf_sys_block_path(s, "/loop/", st.st_dev); |
18b5886e LP |
683 | if (access(s, F_OK) < 0) { |
684 | if (errno != ENOENT) | |
685 | return -errno; | |
686 | ||
687 | /* The device itself isn't a loop device, but maybe it's a partition and its parent is? */ | |
553e15f2 | 688 | xsprintf_sys_block_path(s, "/../loop/", st.st_dev); |
18b5886e LP |
689 | if (access(s, F_OK) < 0) |
690 | return errno == ENOENT ? false : -errno; | |
691 | } | |
692 | ||
693 | return true; | |
694 | } | |
695 | ||
696 | static int mount_partition( | |
697 | DissectedPartition *m, | |
698 | const char *where, | |
699 | const char *directory, | |
2d3a5a73 | 700 | uid_t uid_shift, |
18b5886e LP |
701 | DissectImageFlags flags) { |
702 | ||
2d3a5a73 LP |
703 | _cleanup_free_ char *chased = NULL, *options = NULL; |
704 | const char *p, *node, *fstype; | |
8c1be37e | 705 | bool rw; |
2eedfd2d | 706 | int r; |
8c1be37e LP |
707 | |
708 | assert(m); | |
709 | assert(where); | |
710 | ||
18b5886e LP |
711 | node = m->decrypted_node ?: m->node; |
712 | fstype = m->decrypted_fstype ?: m->fstype; | |
713 | ||
714 | if (!m->found || !node || !fstype) | |
8c1be37e LP |
715 | return 0; |
716 | ||
18b5886e LP |
717 | /* Stacked encryption? Yuck */ |
718 | if (streq_ptr(fstype, "crypto_LUKS")) | |
719 | return -ELOOP; | |
720 | ||
721 | rw = m->rw && !(flags & DISSECT_IMAGE_READ_ONLY); | |
8c1be37e | 722 | |
2eedfd2d LP |
723 | if (directory) { |
724 | r = chase_symlinks(directory, where, CHASE_PREFIX_ROOT, &chased); | |
725 | if (r < 0) | |
726 | return r; | |
727 | ||
728 | p = chased; | |
729 | } else | |
8c1be37e LP |
730 | p = where; |
731 | ||
18b5886e | 732 | /* If requested, turn on discard support. */ |
154d2269 | 733 | if (fstype_can_discard(fstype) && |
18b5886e | 734 | ((flags & DISSECT_IMAGE_DISCARD) || |
2d3a5a73 LP |
735 | ((flags & DISSECT_IMAGE_DISCARD_ON_LOOP) && is_loop_device(m->node)))) { |
736 | options = strdup("discard"); | |
737 | if (!options) | |
738 | return -ENOMEM; | |
739 | } | |
740 | ||
741 | if (uid_is_valid(uid_shift) && uid_shift != 0 && fstype_can_uid_gid(fstype)) { | |
742 | _cleanup_free_ char *uid_option = NULL; | |
743 | ||
744 | if (asprintf(&uid_option, "uid=" UID_FMT ",gid=" GID_FMT, uid_shift, (gid_t) uid_shift) < 0) | |
745 | return -ENOMEM; | |
746 | ||
747 | if (!strextend_with_separator(&options, ",", uid_option, NULL)) | |
748 | return -ENOMEM; | |
749 | } | |
8c1be37e | 750 | |
18b5886e | 751 | return mount_verbose(LOG_DEBUG, node, p, fstype, MS_NODEV|(rw ? 0 : MS_RDONLY), options); |
8c1be37e LP |
752 | } |
753 | ||
2d3a5a73 | 754 | int dissected_image_mount(DissectedImage *m, const char *where, uid_t uid_shift, DissectImageFlags flags) { |
8c1be37e LP |
755 | int r; |
756 | ||
757 | assert(m); | |
758 | assert(where); | |
759 | ||
760 | if (!m->partitions[PARTITION_ROOT].found) | |
761 | return -ENXIO; | |
762 | ||
2d3a5a73 LP |
763 | if ((flags & DISSECT_IMAGE_MOUNT_NON_ROOT_ONLY) == 0) { |
764 | r = mount_partition(m->partitions + PARTITION_ROOT, where, NULL, uid_shift, flags); | |
765 | if (r < 0) | |
766 | return r; | |
767 | } | |
768 | ||
769 | if ((flags & DISSECT_IMAGE_MOUNT_ROOT_ONLY)) | |
770 | return 0; | |
8c1be37e | 771 | |
2d3a5a73 | 772 | r = mount_partition(m->partitions + PARTITION_HOME, where, "/home", uid_shift, flags); |
8c1be37e LP |
773 | if (r < 0) |
774 | return r; | |
775 | ||
2d3a5a73 | 776 | r = mount_partition(m->partitions + PARTITION_SRV, where, "/srv", uid_shift, flags); |
8c1be37e LP |
777 | if (r < 0) |
778 | return r; | |
779 | ||
780 | if (m->partitions[PARTITION_ESP].found) { | |
2eedfd2d | 781 | const char *mp; |
8c1be37e LP |
782 | |
783 | /* Mount the ESP to /efi if it exists and is empty. If it doesn't exist, use /boot instead. */ | |
784 | ||
2eedfd2d LP |
785 | FOREACH_STRING(mp, "/efi", "/boot") { |
786 | _cleanup_free_ char *p = NULL; | |
787 | ||
788 | r = chase_symlinks(mp, where, CHASE_PREFIX_ROOT, &p); | |
8c1be37e | 789 | if (r < 0) |
2eedfd2d LP |
790 | continue; |
791 | ||
792 | r = dir_is_empty(p); | |
793 | if (r > 0) { | |
2d3a5a73 | 794 | r = mount_partition(m->partitions + PARTITION_ESP, where, mp, uid_shift, flags); |
2eedfd2d LP |
795 | if (r < 0) |
796 | return r; | |
797 | } | |
8c1be37e LP |
798 | } |
799 | } | |
800 | ||
801 | return 0; | |
802 | } | |
803 | ||
349cc4a5 | 804 | #if HAVE_LIBCRYPTSETUP |
18b5886e LP |
805 | typedef struct DecryptedPartition { |
806 | struct crypt_device *device; | |
807 | char *name; | |
808 | bool relinquished; | |
809 | } DecryptedPartition; | |
810 | ||
811 | struct DecryptedImage { | |
812 | DecryptedPartition *decrypted; | |
813 | size_t n_decrypted; | |
814 | size_t n_allocated; | |
815 | }; | |
816 | #endif | |
817 | ||
818 | DecryptedImage* decrypted_image_unref(DecryptedImage* d) { | |
349cc4a5 | 819 | #if HAVE_LIBCRYPTSETUP |
18b5886e LP |
820 | size_t i; |
821 | int r; | |
822 | ||
823 | if (!d) | |
824 | return NULL; | |
825 | ||
826 | for (i = 0; i < d->n_decrypted; i++) { | |
827 | DecryptedPartition *p = d->decrypted + i; | |
828 | ||
829 | if (p->device && p->name && !p->relinquished) { | |
830 | r = crypt_deactivate(p->device, p->name); | |
831 | if (r < 0) | |
832 | log_debug_errno(r, "Failed to deactivate encrypted partition %s", p->name); | |
833 | } | |
834 | ||
835 | if (p->device) | |
836 | crypt_free(p->device); | |
837 | free(p->name); | |
838 | } | |
839 | ||
840 | free(d); | |
841 | #endif | |
842 | return NULL; | |
843 | } | |
844 | ||
349cc4a5 | 845 | #if HAVE_LIBCRYPTSETUP |
4623e8e6 LP |
846 | |
847 | static int make_dm_name_and_node(const void *original_node, const char *suffix, char **ret_name, char **ret_node) { | |
848 | _cleanup_free_ char *name = NULL, *node = NULL; | |
849 | const char *base; | |
850 | ||
851 | assert(original_node); | |
852 | assert(suffix); | |
853 | assert(ret_name); | |
854 | assert(ret_node); | |
855 | ||
856 | base = strrchr(original_node, '/'); | |
857 | if (!base) | |
858 | return -EINVAL; | |
859 | base++; | |
860 | if (isempty(base)) | |
861 | return -EINVAL; | |
862 | ||
863 | name = strjoin(base, suffix); | |
864 | if (!name) | |
865 | return -ENOMEM; | |
866 | if (!filename_is_valid(name)) | |
867 | return -EINVAL; | |
868 | ||
869 | node = strjoin(crypt_get_dir(), "/", name); | |
870 | if (!node) | |
871 | return -ENOMEM; | |
872 | ||
873 | *ret_name = name; | |
874 | *ret_node = node; | |
875 | ||
876 | name = node = NULL; | |
877 | return 0; | |
878 | } | |
879 | ||
18b5886e LP |
880 | static int decrypt_partition( |
881 | DissectedPartition *m, | |
882 | const char *passphrase, | |
883 | DissectImageFlags flags, | |
884 | DecryptedImage *d) { | |
885 | ||
886 | _cleanup_free_ char *node = NULL, *name = NULL; | |
294bd454 | 887 | _cleanup_(crypt_freep) struct crypt_device *cd = NULL; |
18b5886e LP |
888 | int r; |
889 | ||
890 | assert(m); | |
891 | assert(d); | |
892 | ||
893 | if (!m->found || !m->node || !m->fstype) | |
894 | return 0; | |
895 | ||
896 | if (!streq(m->fstype, "crypto_LUKS")) | |
897 | return 0; | |
898 | ||
bdd73ac5 ZJS |
899 | if (!passphrase) |
900 | return -ENOKEY; | |
901 | ||
4623e8e6 LP |
902 | r = make_dm_name_and_node(m->node, "-decrypted", &name, &node); |
903 | if (r < 0) | |
904 | return r; | |
18b5886e LP |
905 | |
906 | if (!GREEDY_REALLOC0(d->decrypted, d->n_allocated, d->n_decrypted + 1)) | |
907 | return -ENOMEM; | |
908 | ||
909 | r = crypt_init(&cd, m->node); | |
910 | if (r < 0) | |
715cbb81 | 911 | return log_debug_errno(r, "Failed to initialize dm-crypt: %m"); |
18b5886e | 912 | |
dd59868b | 913 | r = crypt_load(cd, CRYPT_LUKS, NULL); |
294bd454 ZJS |
914 | if (r < 0) |
915 | return log_debug_errno(r, "Failed to load LUKS metadata: %m"); | |
18b5886e LP |
916 | |
917 | r = crypt_activate_by_passphrase(cd, name, CRYPT_ANY_SLOT, passphrase, strlen(passphrase), | |
918 | ((flags & DISSECT_IMAGE_READ_ONLY) ? CRYPT_ACTIVATE_READONLY : 0) | | |
919 | ((flags & DISSECT_IMAGE_DISCARD_ON_CRYPTO) ? CRYPT_ACTIVATE_ALLOW_DISCARDS : 0)); | |
294bd454 | 920 | if (r < 0) { |
715cbb81 | 921 | log_debug_errno(r, "Failed to activate LUKS device: %m"); |
294bd454 | 922 | return r == -EPERM ? -EKEYREJECTED : r; |
18b5886e | 923 | } |
18b5886e LP |
924 | |
925 | d->decrypted[d->n_decrypted].name = name; | |
926 | name = NULL; | |
927 | ||
928 | d->decrypted[d->n_decrypted].device = cd; | |
294bd454 | 929 | cd = NULL; |
18b5886e LP |
930 | d->n_decrypted++; |
931 | ||
932 | m->decrypted_node = node; | |
933 | node = NULL; | |
934 | ||
935 | return 0; | |
4623e8e6 LP |
936 | } |
937 | ||
938 | static int verity_partition( | |
939 | DissectedPartition *m, | |
940 | DissectedPartition *v, | |
941 | const void *root_hash, | |
942 | size_t root_hash_size, | |
943 | DissectImageFlags flags, | |
944 | DecryptedImage *d) { | |
945 | ||
946 | _cleanup_free_ char *node = NULL, *name = NULL; | |
294bd454 | 947 | _cleanup_(crypt_freep) struct crypt_device *cd = NULL; |
4623e8e6 LP |
948 | int r; |
949 | ||
950 | assert(m); | |
951 | assert(v); | |
952 | ||
953 | if (!root_hash) | |
954 | return 0; | |
955 | ||
956 | if (!m->found || !m->node || !m->fstype) | |
957 | return 0; | |
958 | if (!v->found || !v->node || !v->fstype) | |
959 | return 0; | |
960 | ||
961 | if (!streq(v->fstype, "DM_verity_hash")) | |
962 | return 0; | |
963 | ||
964 | r = make_dm_name_and_node(m->node, "-verity", &name, &node); | |
965 | if (r < 0) | |
966 | return r; | |
967 | ||
968 | if (!GREEDY_REALLOC0(d->decrypted, d->n_allocated, d->n_decrypted + 1)) | |
969 | return -ENOMEM; | |
970 | ||
971 | r = crypt_init(&cd, v->node); | |
972 | if (r < 0) | |
973 | return r; | |
974 | ||
975 | r = crypt_load(cd, CRYPT_VERITY, NULL); | |
976 | if (r < 0) | |
294bd454 | 977 | return r; |
4623e8e6 LP |
978 | |
979 | r = crypt_set_data_device(cd, m->node); | |
980 | if (r < 0) | |
294bd454 | 981 | return r; |
4623e8e6 LP |
982 | |
983 | r = crypt_activate_by_volume_key(cd, name, root_hash, root_hash_size, CRYPT_ACTIVATE_READONLY); | |
984 | if (r < 0) | |
294bd454 | 985 | return r; |
4623e8e6 LP |
986 | |
987 | d->decrypted[d->n_decrypted].name = name; | |
988 | name = NULL; | |
989 | ||
990 | d->decrypted[d->n_decrypted].device = cd; | |
294bd454 | 991 | cd = NULL; |
4623e8e6 LP |
992 | d->n_decrypted++; |
993 | ||
994 | m->decrypted_node = node; | |
995 | node = NULL; | |
996 | ||
997 | return 0; | |
18b5886e LP |
998 | } |
999 | #endif | |
1000 | ||
1001 | int dissected_image_decrypt( | |
1002 | DissectedImage *m, | |
1003 | const char *passphrase, | |
4623e8e6 LP |
1004 | const void *root_hash, |
1005 | size_t root_hash_size, | |
18b5886e LP |
1006 | DissectImageFlags flags, |
1007 | DecryptedImage **ret) { | |
1008 | ||
349cc4a5 | 1009 | #if HAVE_LIBCRYPTSETUP |
49b5b3b4 | 1010 | _cleanup_(decrypted_image_unrefp) DecryptedImage *d = NULL; |
18b5886e LP |
1011 | unsigned i; |
1012 | int r; | |
1013 | #endif | |
1014 | ||
1015 | assert(m); | |
4623e8e6 | 1016 | assert(root_hash || root_hash_size == 0); |
18b5886e LP |
1017 | |
1018 | /* Returns: | |
1019 | * | |
1020 | * = 0 → There was nothing to decrypt | |
1021 | * > 0 → Decrypted successfully | |
d1c536f5 | 1022 | * -ENOKEY → There's something to decrypt but no key was supplied |
18b5886e LP |
1023 | * -EKEYREJECTED → Passed key was not correct |
1024 | */ | |
1025 | ||
4623e8e6 LP |
1026 | if (root_hash && root_hash_size < sizeof(sd_id128_t)) |
1027 | return -EINVAL; | |
1028 | ||
1029 | if (!m->encrypted && !m->verity) { | |
18b5886e LP |
1030 | *ret = NULL; |
1031 | return 0; | |
1032 | } | |
1033 | ||
349cc4a5 | 1034 | #if HAVE_LIBCRYPTSETUP |
18b5886e LP |
1035 | d = new0(DecryptedImage, 1); |
1036 | if (!d) | |
1037 | return -ENOMEM; | |
1038 | ||
1039 | for (i = 0; i < _PARTITION_DESIGNATOR_MAX; i++) { | |
1040 | DissectedPartition *p = m->partitions + i; | |
4623e8e6 | 1041 | int k; |
18b5886e LP |
1042 | |
1043 | if (!p->found) | |
1044 | continue; | |
1045 | ||
1046 | r = decrypt_partition(p, passphrase, flags, d); | |
1047 | if (r < 0) | |
1048 | return r; | |
1049 | ||
4623e8e6 LP |
1050 | k = PARTITION_VERITY_OF(i); |
1051 | if (k >= 0) { | |
1052 | r = verity_partition(p, m->partitions + k, root_hash, root_hash_size, flags, d); | |
1053 | if (r < 0) | |
1054 | return r; | |
1055 | } | |
1056 | ||
18b5886e LP |
1057 | if (!p->decrypted_fstype && p->decrypted_node) { |
1058 | r = probe_filesystem(p->decrypted_node, &p->decrypted_fstype); | |
7cc84b2c | 1059 | if (r < 0 && r != -EUCLEAN) |
18b5886e LP |
1060 | return r; |
1061 | } | |
1062 | } | |
1063 | ||
1064 | *ret = d; | |
1065 | d = NULL; | |
1066 | ||
1067 | return 1; | |
1068 | #else | |
1069 | return -EOPNOTSUPP; | |
1070 | #endif | |
1071 | } | |
1072 | ||
1073 | int dissected_image_decrypt_interactively( | |
1074 | DissectedImage *m, | |
1075 | const char *passphrase, | |
4623e8e6 LP |
1076 | const void *root_hash, |
1077 | size_t root_hash_size, | |
18b5886e LP |
1078 | DissectImageFlags flags, |
1079 | DecryptedImage **ret) { | |
1080 | ||
1081 | _cleanup_strv_free_erase_ char **z = NULL; | |
1082 | int n = 3, r; | |
1083 | ||
1084 | if (passphrase) | |
1085 | n--; | |
1086 | ||
1087 | for (;;) { | |
4623e8e6 | 1088 | r = dissected_image_decrypt(m, passphrase, root_hash, root_hash_size, flags, ret); |
18b5886e LP |
1089 | if (r >= 0) |
1090 | return r; | |
1091 | if (r == -EKEYREJECTED) | |
1092 | log_error_errno(r, "Incorrect passphrase, try again!"); | |
1093 | else if (r != -ENOKEY) { | |
1094 | log_error_errno(r, "Failed to decrypt image: %m"); | |
1095 | return r; | |
1096 | } | |
1097 | ||
1098 | if (--n < 0) { | |
1099 | log_error("Too many retries."); | |
1100 | return -EKEYREJECTED; | |
1101 | } | |
1102 | ||
1103 | z = strv_free(z); | |
1104 | ||
1105 | r = ask_password_auto("Please enter image passphrase!", NULL, "dissect", "dissect", USEC_INFINITY, 0, &z); | |
1106 | if (r < 0) | |
1107 | return log_error_errno(r, "Failed to query for passphrase: %m"); | |
1108 | ||
1109 | passphrase = z[0]; | |
1110 | } | |
1111 | } | |
1112 | ||
349cc4a5 | 1113 | #if HAVE_LIBCRYPTSETUP |
18b5886e LP |
1114 | static int deferred_remove(DecryptedPartition *p) { |
1115 | ||
1116 | struct dm_ioctl dm = { | |
1117 | .version = { | |
1118 | DM_VERSION_MAJOR, | |
1119 | DM_VERSION_MINOR, | |
1120 | DM_VERSION_PATCHLEVEL | |
1121 | }, | |
1122 | .data_size = sizeof(dm), | |
1123 | .flags = DM_DEFERRED_REMOVE, | |
1124 | }; | |
1125 | ||
1126 | _cleanup_close_ int fd = -1; | |
1127 | ||
1128 | assert(p); | |
1129 | ||
1130 | /* Unfortunately, libcryptsetup doesn't provide a proper API for this, hence call the ioctl() directly. */ | |
1131 | ||
1132 | fd = open("/dev/mapper/control", O_RDWR|O_CLOEXEC); | |
1133 | if (fd < 0) | |
1134 | return -errno; | |
1135 | ||
1136 | strncpy(dm.name, p->name, sizeof(dm.name)); | |
1137 | ||
1138 | if (ioctl(fd, DM_DEV_REMOVE, &dm)) | |
1139 | return -errno; | |
1140 | ||
1141 | return 0; | |
1142 | } | |
1143 | #endif | |
1144 | ||
1145 | int decrypted_image_relinquish(DecryptedImage *d) { | |
1146 | ||
349cc4a5 | 1147 | #if HAVE_LIBCRYPTSETUP |
18b5886e LP |
1148 | size_t i; |
1149 | int r; | |
1150 | #endif | |
1151 | ||
1152 | assert(d); | |
1153 | ||
1154 | /* Turns on automatic removal after the last use ended for all DM devices of this image, and sets a boolean so | |
1155 | * that we don't clean it up ourselves either anymore */ | |
1156 | ||
349cc4a5 | 1157 | #if HAVE_LIBCRYPTSETUP |
18b5886e LP |
1158 | for (i = 0; i < d->n_decrypted; i++) { |
1159 | DecryptedPartition *p = d->decrypted + i; | |
1160 | ||
1161 | if (p->relinquished) | |
1162 | continue; | |
1163 | ||
1164 | r = deferred_remove(p); | |
1165 | if (r < 0) | |
1166 | return log_debug_errno(r, "Failed to mark %s for auto-removal: %m", p->name); | |
1167 | ||
1168 | p->relinquished = true; | |
1169 | } | |
1170 | #endif | |
1171 | ||
1172 | return 0; | |
1173 | } | |
1174 | ||
78ebe980 LP |
1175 | int root_hash_load(const char *image, void **ret, size_t *ret_size) { |
1176 | _cleanup_free_ char *text = NULL; | |
1177 | _cleanup_free_ void *k = NULL; | |
78ebe980 LP |
1178 | size_t l; |
1179 | int r; | |
1180 | ||
1181 | assert(image); | |
1182 | assert(ret); | |
1183 | assert(ret_size); | |
1184 | ||
1185 | if (is_device_path(image)) { | |
1186 | /* If we are asked to load the root hash for a device node, exit early */ | |
1187 | *ret = NULL; | |
1188 | *ret_size = 0; | |
1189 | return 0; | |
1190 | } | |
1191 | ||
41488e1f LP |
1192 | r = getxattr_malloc(image, "user.verity.roothash", &text, true); |
1193 | if (r < 0) { | |
1194 | char *fn, *e, *n; | |
78ebe980 | 1195 | |
41488e1f LP |
1196 | if (!IN_SET(r, -ENODATA, -EOPNOTSUPP, -ENOENT)) |
1197 | return r; | |
78ebe980 | 1198 | |
fbd0b64f | 1199 | fn = newa(char, strlen(image) + STRLEN(".roothash") + 1); |
41488e1f LP |
1200 | n = stpcpy(fn, image); |
1201 | e = endswith(fn, ".raw"); | |
1202 | if (e) | |
1203 | n = e; | |
1204 | ||
1205 | strcpy(n, ".roothash"); | |
1206 | ||
1207 | r = read_one_line_file(fn, &text); | |
1208 | if (r == -ENOENT) { | |
1209 | *ret = NULL; | |
1210 | *ret_size = 0; | |
1211 | return 0; | |
1212 | } | |
1213 | if (r < 0) | |
1214 | return r; | |
78ebe980 | 1215 | } |
78ebe980 LP |
1216 | |
1217 | r = unhexmem(text, strlen(text), &k, &l); | |
1218 | if (r < 0) | |
1219 | return r; | |
1220 | if (l < sizeof(sd_id128_t)) | |
1221 | return -EINVAL; | |
1222 | ||
1223 | *ret = k; | |
1224 | *ret_size = l; | |
1225 | ||
1226 | k = NULL; | |
1227 | ||
1228 | return 1; | |
1229 | } | |
1230 | ||
3b925504 LP |
1231 | int dissected_image_acquire_metadata(DissectedImage *m) { |
1232 | ||
1233 | enum { | |
1234 | META_HOSTNAME, | |
1235 | META_MACHINE_ID, | |
1236 | META_MACHINE_INFO, | |
1237 | META_OS_RELEASE, | |
1238 | _META_MAX, | |
1239 | }; | |
1240 | ||
1241 | static const char *const paths[_META_MAX] = { | |
1242 | [META_HOSTNAME] = "/etc/hostname\0", | |
1243 | [META_MACHINE_ID] = "/etc/machine-id\0", | |
1244 | [META_MACHINE_INFO] = "/etc/machine-info\0", | |
1245 | [META_OS_RELEASE] = "/etc/os-release\0/usr/lib/os-release\0", | |
1246 | }; | |
1247 | ||
1248 | _cleanup_strv_free_ char **machine_info = NULL, **os_release = NULL; | |
1249 | _cleanup_(rmdir_and_freep) char *t = NULL; | |
1250 | _cleanup_(sigkill_waitp) pid_t child = 0; | |
1251 | sd_id128_t machine_id = SD_ID128_NULL; | |
1252 | _cleanup_free_ char *hostname = NULL; | |
1253 | unsigned n_meta_initialized = 0, k; | |
1254 | int fds[2 * _META_MAX], r; | |
3b925504 LP |
1255 | |
1256 | BLOCK_SIGNALS(SIGCHLD); | |
1257 | ||
1258 | assert(m); | |
1259 | ||
1260 | for (; n_meta_initialized < _META_MAX; n_meta_initialized ++) | |
1261 | if (pipe2(fds + 2*n_meta_initialized, O_CLOEXEC) < 0) { | |
1262 | r = -errno; | |
1263 | goto finish; | |
1264 | } | |
1265 | ||
1266 | r = mkdtemp_malloc("/tmp/dissect-XXXXXX", &t); | |
1267 | if (r < 0) | |
1268 | goto finish; | |
1269 | ||
be39f6ee LP |
1270 | r = safe_fork("(sd-dissect)", FORK_RESET_SIGNALS|FORK_DEATHSIG|FORK_NEW_MOUNTNS, &child); |
1271 | if (r < 0) | |
3b925504 | 1272 | goto finish; |
be39f6ee | 1273 | if (r == 0) { |
3b925504 LP |
1274 | /* Make sure we never propagate to the host */ |
1275 | if (mount(NULL, "/", NULL, MS_SLAVE | MS_REC, NULL) < 0) | |
1276 | _exit(EXIT_FAILURE); | |
1277 | ||
2d3a5a73 | 1278 | r = dissected_image_mount(m, t, UID_INVALID, DISSECT_IMAGE_READ_ONLY); |
3b925504 LP |
1279 | if (r < 0) |
1280 | _exit(EXIT_FAILURE); | |
1281 | ||
1282 | for (k = 0; k < _META_MAX; k++) { | |
1283 | _cleanup_close_ int fd = -1; | |
1284 | const char *p; | |
1285 | ||
1286 | fds[2*k] = safe_close(fds[2*k]); | |
1287 | ||
1288 | NULSTR_FOREACH(p, paths[k]) { | |
1289 | _cleanup_free_ char *q = NULL; | |
1290 | ||
62570f6f | 1291 | r = chase_symlinks(p, t, CHASE_PREFIX_ROOT|CHASE_TRAIL_SLASH, &q); |
3b925504 LP |
1292 | if (r < 0) |
1293 | continue; | |
1294 | ||
1295 | fd = open(q, O_RDONLY|O_CLOEXEC|O_NOCTTY); | |
1296 | if (fd >= 0) | |
1297 | break; | |
1298 | } | |
1299 | if (fd < 0) | |
1300 | continue; | |
1301 | ||
1302 | r = copy_bytes(fd, fds[2*k+1], (uint64_t) -1, 0); | |
1303 | if (r < 0) | |
1304 | _exit(EXIT_FAILURE); | |
1305 | ||
1306 | fds[2*k+1] = safe_close(fds[2*k+1]); | |
1307 | } | |
1308 | ||
1309 | _exit(EXIT_SUCCESS); | |
1310 | } | |
1311 | ||
1312 | for (k = 0; k < _META_MAX; k++) { | |
1313 | _cleanup_fclose_ FILE *f = NULL; | |
1314 | ||
1315 | fds[2*k+1] = safe_close(fds[2*k+1]); | |
1316 | ||
1317 | f = fdopen(fds[2*k], "re"); | |
1318 | if (!f) { | |
1319 | r = -errno; | |
1320 | goto finish; | |
1321 | } | |
1322 | ||
1323 | fds[2*k] = -1; | |
1324 | ||
1325 | switch (k) { | |
1326 | ||
1327 | case META_HOSTNAME: | |
1328 | r = read_etc_hostname_stream(f, &hostname); | |
1329 | if (r < 0) | |
1330 | log_debug_errno(r, "Failed to read /etc/hostname: %m"); | |
1331 | ||
1332 | break; | |
1333 | ||
1334 | case META_MACHINE_ID: { | |
1335 | _cleanup_free_ char *line = NULL; | |
1336 | ||
1337 | r = read_line(f, LONG_LINE_MAX, &line); | |
1338 | if (r < 0) | |
1339 | log_debug_errno(r, "Failed to read /etc/machine-id: %m"); | |
1340 | else if (r == 33) { | |
1341 | r = sd_id128_from_string(line, &machine_id); | |
1342 | if (r < 0) | |
1343 | log_debug_errno(r, "Image contains invalid /etc/machine-id: %s", line); | |
1344 | } else if (r == 0) | |
1345 | log_debug("/etc/machine-id file is empty."); | |
1346 | else | |
1347 | log_debug("/etc/machine-id has unexpected length %i.", r); | |
1348 | ||
1349 | break; | |
1350 | } | |
1351 | ||
1352 | case META_MACHINE_INFO: | |
1353 | r = load_env_file_pairs(f, "machine-info", NULL, &machine_info); | |
1354 | if (r < 0) | |
1355 | log_debug_errno(r, "Failed to read /etc/machine-info: %m"); | |
1356 | ||
1357 | break; | |
1358 | ||
1359 | case META_OS_RELEASE: | |
1360 | r = load_env_file_pairs(f, "os-release", NULL, &os_release); | |
1361 | if (r < 0) | |
1362 | log_debug_errno(r, "Failed to read OS release file: %m"); | |
1363 | ||
1364 | break; | |
1365 | } | |
1366 | } | |
1367 | ||
2e87a1fd | 1368 | r = wait_for_terminate_and_check("(sd-dissect)", child, 0); |
3b925504 | 1369 | child = 0; |
2e87a1fd | 1370 | if (r < 0) |
3b925504 | 1371 | goto finish; |
2e87a1fd LP |
1372 | if (r != EXIT_SUCCESS) |
1373 | return -EPROTO; | |
3b925504 LP |
1374 | |
1375 | free_and_replace(m->hostname, hostname); | |
1376 | m->machine_id = machine_id; | |
1377 | strv_free_and_replace(m->machine_info, machine_info); | |
1378 | strv_free_and_replace(m->os_release, os_release); | |
1379 | ||
1380 | finish: | |
1381 | for (k = 0; k < n_meta_initialized; k++) | |
1382 | safe_close_pair(fds + 2*k); | |
1383 | ||
1384 | return r; | |
1385 | } | |
1386 | ||
4526113f LP |
1387 | int dissect_image_and_warn( |
1388 | int fd, | |
1389 | const char *name, | |
1390 | const void *root_hash, | |
1391 | size_t root_hash_size, | |
1392 | DissectImageFlags flags, | |
1393 | DissectedImage **ret) { | |
1394 | ||
1395 | _cleanup_free_ char *buffer = NULL; | |
1396 | int r; | |
1397 | ||
1398 | if (!name) { | |
1399 | r = fd_get_path(fd, &buffer); | |
1400 | if (r < 0) | |
1401 | return r; | |
1402 | ||
1403 | name = buffer; | |
1404 | } | |
1405 | ||
1406 | r = dissect_image(fd, root_hash, root_hash_size, flags, ret); | |
1407 | ||
1408 | switch (r) { | |
1409 | ||
1410 | case -EOPNOTSUPP: | |
1411 | return log_error_errno(r, "Dissecting images is not supported, compiled without blkid support."); | |
1412 | ||
1413 | case -ENOPKG: | |
1414 | return log_error_errno(r, "Couldn't identify a suitable partition table or file system in '%s'.", name); | |
1415 | ||
1416 | case -EADDRNOTAVAIL: | |
1417 | return log_error_errno(r, "No root partition for specified root hash found in '%s'.", name); | |
1418 | ||
1419 | case -ENOTUNIQ: | |
1420 | return log_error_errno(r, "Multiple suitable root partitions found in image '%s'.", name); | |
1421 | ||
1422 | case -ENXIO: | |
1423 | return log_error_errno(r, "No suitable root partition found in image '%s'.", name); | |
1424 | ||
1425 | case -EPROTONOSUPPORT: | |
1426 | return log_error_errno(r, "Device '%s' is loopback block device with partition scanning turned off, please turn it on.", name); | |
1427 | ||
1428 | default: | |
1429 | if (r < 0) | |
1430 | return log_error_errno(r, "Failed to dissect image '%s': %m", name); | |
1431 | ||
1432 | return r; | |
1433 | } | |
1434 | } | |
1435 | ||
8c1be37e LP |
1436 | static const char *const partition_designator_table[] = { |
1437 | [PARTITION_ROOT] = "root", | |
1438 | [PARTITION_ROOT_SECONDARY] = "root-secondary", | |
1439 | [PARTITION_HOME] = "home", | |
1440 | [PARTITION_SRV] = "srv", | |
1441 | [PARTITION_ESP] = "esp", | |
1442 | [PARTITION_SWAP] = "swap", | |
4623e8e6 LP |
1443 | [PARTITION_ROOT_VERITY] = "root-verity", |
1444 | [PARTITION_ROOT_SECONDARY_VERITY] = "root-secondary-verity", | |
8c1be37e LP |
1445 | }; |
1446 | ||
1447 | DEFINE_STRING_TABLE_LOOKUP(partition_designator, int); |