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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
56ebfaf1 | 2 | |
98c38001 LP |
3 | #include <sys/prctl.h> |
4 | ||
b5efdb8a | 5 | #include "alloc-util.h" |
56ebfaf1 | 6 | #include "btrfs-util.h" |
430f0182 | 7 | #include "capability-util.h" |
4f5dd394 | 8 | #include "copy.h" |
a0956174 | 9 | #include "dirent-util.h" |
4f5dd394 | 10 | #include "escape.h" |
3ffd4af2 | 11 | #include "fd-util.h" |
c004493c | 12 | #include "io-util.h" |
bb15fafe | 13 | #include "path-util.h" |
0b452006 | 14 | #include "process-util.h" |
3ffd4af2 | 15 | #include "pull-common.h" |
4f5dd394 LP |
16 | #include "pull-job.h" |
17 | #include "rm-rf.h" | |
24882e06 | 18 | #include "signal-util.h" |
9818005d | 19 | #include "siphash24.h" |
07630cea | 20 | #include "string-util.h" |
4f5dd394 LP |
21 | #include "strv.h" |
22 | #include "util.h" | |
49cf4170 | 23 | #include "web-util.h" |
56ebfaf1 LP |
24 | |
25 | #define FILENAME_ESCAPE "/.#\"\'" | |
9818005d | 26 | #define HASH_URL_THRESHOLD_LENGTH (_POSIX_PATH_MAX - 16) |
56ebfaf1 | 27 | |
9854730b LP |
28 | int pull_find_old_etags( |
29 | const char *url, | |
30 | const char *image_root, | |
31 | int dt, | |
32 | const char *prefix, | |
33 | const char *suffix, | |
34 | char ***etags) { | |
35 | ||
56ebfaf1 LP |
36 | _cleanup_free_ char *escaped_url = NULL; |
37 | _cleanup_closedir_ DIR *d = NULL; | |
38 | _cleanup_strv_free_ char **l = NULL; | |
39 | struct dirent *de; | |
40 | int r; | |
41 | ||
42 | assert(url); | |
43 | assert(etags); | |
44 | ||
45 | if (!image_root) | |
46 | image_root = "/var/lib/machines"; | |
47 | ||
48 | escaped_url = xescape(url, FILENAME_ESCAPE); | |
49 | if (!escaped_url) | |
50 | return -ENOMEM; | |
51 | ||
52 | d = opendir(image_root); | |
53 | if (!d) { | |
54 | if (errno == ENOENT) { | |
55 | *etags = NULL; | |
56 | return 0; | |
57 | } | |
58 | ||
59 | return -errno; | |
60 | } | |
61 | ||
62 | FOREACH_DIRENT_ALL(de, d, return -errno) { | |
63 | const char *a, *b; | |
64 | char *u; | |
65 | ||
66 | if (de->d_type != DT_UNKNOWN && | |
67 | de->d_type != dt) | |
68 | continue; | |
69 | ||
70 | if (prefix) { | |
71 | a = startswith(de->d_name, prefix); | |
72 | if (!a) | |
73 | continue; | |
74 | } else | |
75 | a = de->d_name; | |
76 | ||
77 | a = startswith(a, escaped_url); | |
78 | if (!a) | |
79 | continue; | |
80 | ||
81 | a = startswith(a, "."); | |
82 | if (!a) | |
83 | continue; | |
84 | ||
85 | if (suffix) { | |
86 | b = endswith(de->d_name, suffix); | |
87 | if (!b) | |
88 | continue; | |
89 | } else | |
90 | b = strchr(de->d_name, 0); | |
91 | ||
92 | if (a >= b) | |
93 | continue; | |
94 | ||
527b7a42 LP |
95 | r = cunescape_length(a, b - a, 0, &u); |
96 | if (r < 0) | |
97 | return r; | |
56ebfaf1 LP |
98 | |
99 | if (!http_etag_is_valid(u)) { | |
100 | free(u); | |
101 | continue; | |
102 | } | |
103 | ||
104 | r = strv_consume(&l, u); | |
105 | if (r < 0) | |
106 | return r; | |
107 | } | |
108 | ||
ae2a15bc | 109 | *etags = TAKE_PTR(l); |
56ebfaf1 LP |
110 | |
111 | return 0; | |
112 | } | |
113 | ||
dc2c282b | 114 | int pull_make_local_copy(const char *final, const char *image_root, const char *local, bool force_local) { |
56ebfaf1 LP |
115 | const char *p; |
116 | int r; | |
117 | ||
118 | assert(final); | |
119 | assert(local); | |
120 | ||
121 | if (!image_root) | |
122 | image_root = "/var/lib/machines"; | |
123 | ||
63c372cb | 124 | p = strjoina(image_root, "/", local); |
56ebfaf1 | 125 | |
d9e2daaf LP |
126 | if (force_local) |
127 | (void) rm_rf(p, REMOVE_ROOT|REMOVE_PHYSICAL|REMOVE_SUBVOLUME); | |
56ebfaf1 | 128 | |
17cbb288 LP |
129 | r = btrfs_subvol_snapshot(final, p, |
130 | BTRFS_SNAPSHOT_QUOTA| | |
131 | BTRFS_SNAPSHOT_FALLBACK_COPY| | |
132 | BTRFS_SNAPSHOT_FALLBACK_DIRECTORY| | |
133 | BTRFS_SNAPSHOT_RECURSIVE); | |
134 | if (r < 0) | |
56ebfaf1 LP |
135 | return log_error_errno(r, "Failed to create local image: %m"); |
136 | ||
137 | log_info("Created new local image '%s'.", local); | |
138 | ||
139 | return 0; | |
140 | } | |
141 | ||
9818005d JS |
142 | static int hash_url(const char *url, char **ret) { |
143 | uint64_t h; | |
144 | static const sd_id128_t k = SD_ID128_ARRAY(df,89,16,87,01,cc,42,30,98,ab,4a,19,a6,a5,63,4f); | |
145 | ||
146 | assert(url); | |
147 | ||
933f9cae | 148 | h = siphash24(url, strlen(url), k.bytes); |
9818005d JS |
149 | if (asprintf(ret, "%"PRIx64, h) < 0) |
150 | return -ENOMEM; | |
151 | ||
152 | return 0; | |
153 | } | |
154 | ||
dc2c282b | 155 | int pull_make_path(const char *url, const char *etag, const char *image_root, const char *prefix, const char *suffix, char **ret) { |
9818005d | 156 | _cleanup_free_ char *escaped_url = NULL, *escaped_etag = NULL; |
56ebfaf1 LP |
157 | char *path; |
158 | ||
159 | assert(url); | |
160 | assert(ret); | |
161 | ||
162 | if (!image_root) | |
163 | image_root = "/var/lib/machines"; | |
164 | ||
165 | escaped_url = xescape(url, FILENAME_ESCAPE); | |
166 | if (!escaped_url) | |
167 | return -ENOMEM; | |
168 | ||
169 | if (etag) { | |
56ebfaf1 LP |
170 | escaped_etag = xescape(etag, FILENAME_ESCAPE); |
171 | if (!escaped_etag) | |
172 | return -ENOMEM; | |
9818005d | 173 | } |
56ebfaf1 | 174 | |
9818005d | 175 | path = strjoin(image_root, "/", strempty(prefix), escaped_url, escaped_etag ? "." : "", |
4600a396 | 176 | strempty(escaped_etag), strempty(suffix)); |
56ebfaf1 LP |
177 | if (!path) |
178 | return -ENOMEM; | |
179 | ||
9818005d JS |
180 | /* URLs might make the path longer than the maximum allowed length for a file name. |
181 | * When that happens, a URL hash is used instead. Paths returned by this function | |
182 | * can be later used with tempfn_random() which adds 16 bytes to the resulting name. */ | |
183 | if (strlen(path) >= HASH_URL_THRESHOLD_LENGTH) { | |
184 | _cleanup_free_ char *hash = NULL; | |
185 | int r; | |
186 | ||
187 | free(path); | |
188 | ||
189 | r = hash_url(url, &hash); | |
190 | if (r < 0) | |
191 | return r; | |
192 | ||
193 | path = strjoin(image_root, "/", strempty(prefix), hash, escaped_etag ? "." : "", | |
4600a396 | 194 | strempty(escaped_etag), strempty(suffix)); |
9818005d JS |
195 | if (!path) |
196 | return -ENOMEM; | |
197 | } | |
198 | ||
56ebfaf1 LP |
199 | *ret = path; |
200 | return 0; | |
201 | } | |
85dbc41d | 202 | |
91359193 | 203 | int pull_make_auxiliary_job( |
9854730b LP |
204 | PullJob **ret, |
205 | const char *url, | |
91359193 LP |
206 | int (*strip_suffixes)(const char *name, char **ret), |
207 | const char *suffix, | |
9854730b LP |
208 | CurlGlue *glue, |
209 | PullJobFinished on_finished, | |
210 | void *userdata) { | |
211 | ||
91359193 | 212 | _cleanup_free_ char *last_component = NULL, *ll = NULL, *auxiliary_url = NULL; |
9854730b LP |
213 | _cleanup_(pull_job_unrefp) PullJob *job = NULL; |
214 | const char *q; | |
215 | int r; | |
216 | ||
217 | assert(ret); | |
218 | assert(url); | |
91359193 | 219 | assert(strip_suffixes); |
9854730b LP |
220 | assert(glue); |
221 | ||
222 | r = import_url_last_component(url, &last_component); | |
223 | if (r < 0) | |
224 | return r; | |
225 | ||
91359193 | 226 | r = strip_suffixes(last_component, &ll); |
9854730b LP |
227 | if (r < 0) |
228 | return r; | |
229 | ||
91359193 | 230 | q = strjoina(ll, suffix); |
9854730b | 231 | |
91359193 | 232 | r = import_url_change_last_component(url, q, &auxiliary_url); |
9854730b LP |
233 | if (r < 0) |
234 | return r; | |
235 | ||
91359193 | 236 | r = pull_job_new(&job, auxiliary_url, glue, userdata); |
9854730b LP |
237 | if (r < 0) |
238 | return r; | |
239 | ||
240 | job->on_finished = on_finished; | |
241 | job->compressed_max = job->uncompressed_max = 1ULL * 1024ULL * 1024ULL; | |
242 | ||
1cc6c93a | 243 | *ret = TAKE_PTR(job); |
9854730b LP |
244 | |
245 | return 0; | |
246 | } | |
247 | ||
dc2c282b LP |
248 | int pull_make_verification_jobs( |
249 | PullJob **ret_checksum_job, | |
250 | PullJob **ret_signature_job, | |
98c38001 LP |
251 | ImportVerify verify, |
252 | const char *url, | |
253 | CurlGlue *glue, | |
dc2c282b | 254 | PullJobFinished on_finished, |
98c38001 LP |
255 | void *userdata) { |
256 | ||
dc2c282b | 257 | _cleanup_(pull_job_unrefp) PullJob *checksum_job = NULL, *signature_job = NULL; |
98c38001 | 258 | int r; |
697be0be | 259 | const char *chksums = NULL; |
98c38001 LP |
260 | |
261 | assert(ret_checksum_job); | |
262 | assert(ret_signature_job); | |
263 | assert(verify >= 0); | |
264 | assert(verify < _IMPORT_VERIFY_MAX); | |
265 | assert(url); | |
266 | assert(glue); | |
267 | ||
268 | if (verify != IMPORT_VERIFY_NO) { | |
697be0be | 269 | _cleanup_free_ char *checksum_url = NULL, *fn = NULL; |
98c38001 | 270 | |
697be0be TB |
271 | /* Queue jobs for the checksum file for the image. */ |
272 | r = import_url_last_component(url, &fn); | |
273 | if (r < 0) | |
274 | return r; | |
275 | ||
276 | chksums = strjoina(fn, ".sha256"); | |
277 | ||
278 | r = import_url_change_last_component(url, chksums, &checksum_url); | |
98c38001 LP |
279 | if (r < 0) |
280 | return r; | |
281 | ||
dc2c282b | 282 | r = pull_job_new(&checksum_job, checksum_url, glue, userdata); |
98c38001 LP |
283 | if (r < 0) |
284 | return r; | |
285 | ||
286 | checksum_job->on_finished = on_finished; | |
287 | checksum_job->uncompressed_max = checksum_job->compressed_max = 1ULL * 1024ULL * 1024ULL; | |
288 | } | |
289 | ||
290 | if (verify == IMPORT_VERIFY_SIGNATURE) { | |
291 | _cleanup_free_ char *signature_url = NULL; | |
292 | ||
293 | /* Queue job for the SHA256SUMS.gpg file for the image. */ | |
294 | r = import_url_change_last_component(url, "SHA256SUMS.gpg", &signature_url); | |
295 | if (r < 0) | |
296 | return r; | |
297 | ||
dc2c282b | 298 | r = pull_job_new(&signature_job, signature_url, glue, userdata); |
98c38001 LP |
299 | if (r < 0) |
300 | return r; | |
301 | ||
302 | signature_job->on_finished = on_finished; | |
303 | signature_job->uncompressed_max = signature_job->compressed_max = 1ULL * 1024ULL * 1024ULL; | |
304 | } | |
305 | ||
306 | *ret_checksum_job = checksum_job; | |
307 | *ret_signature_job = signature_job; | |
308 | ||
309 | checksum_job = signature_job = NULL; | |
310 | ||
311 | return 0; | |
312 | } | |
313 | ||
91359193 | 314 | static int verify_one(PullJob *checksum_job, PullJob *job) { |
98c38001 | 315 | _cleanup_free_ char *fn = NULL; |
91359193 | 316 | const char *line, *p; |
98c38001 LP |
317 | int r; |
318 | ||
91359193 | 319 | assert(checksum_job); |
98c38001 | 320 | |
91359193 | 321 | if (!job) |
98c38001 LP |
322 | return 0; |
323 | ||
91359193 | 324 | assert(IN_SET(job->state, PULL_JOB_DONE, PULL_JOB_FAILED)); |
98c38001 | 325 | |
91359193 LP |
326 | /* Don't verify the checksum if we didn't actually successfully download something new */ |
327 | if (job->state != PULL_JOB_DONE) | |
328 | return 0; | |
329 | if (job->error != 0) | |
330 | return 0; | |
331 | if (job->etag_exists) | |
332 | return 0; | |
98c38001 | 333 | |
91359193 LP |
334 | assert(job->calc_checksum); |
335 | assert(job->checksum); | |
336 | ||
337 | r = import_url_last_component(job->url, &fn); | |
98c38001 LP |
338 | if (r < 0) |
339 | return log_oom(); | |
340 | ||
341 | if (!filename_is_valid(fn)) { | |
91359193 | 342 | log_error("Cannot verify checksum, could not determine server-side file name."); |
98c38001 LP |
343 | return -EBADMSG; |
344 | } | |
345 | ||
91359193 | 346 | line = strjoina(job->checksum, " *", fn, "\n"); |
98c38001 LP |
347 | |
348 | p = memmem(checksum_job->payload, | |
349 | checksum_job->payload_size, | |
350 | line, | |
351 | strlen(line)); | |
352 | ||
697be0be TB |
353 | if (!p) { |
354 | line = strjoina(job->checksum, " ", fn, "\n"); | |
355 | ||
356 | p = memmem(checksum_job->payload, | |
357 | checksum_job->payload_size, | |
358 | line, | |
359 | strlen(line)); | |
360 | } | |
361 | ||
98c38001 | 362 | if (!p || (p != (char*) checksum_job->payload && p[-1] != '\n')) { |
91359193 | 363 | log_error("DOWNLOAD INVALID: Checksum of %s file did not checkout, file has been tampered with.", fn); |
98c38001 LP |
364 | return -EBADMSG; |
365 | } | |
366 | ||
91359193 LP |
367 | log_info("SHA256 checksum of %s is valid.", job->url); |
368 | return 1; | |
369 | } | |
98c38001 | 370 | |
91359193 LP |
371 | int pull_verify(PullJob *main_job, |
372 | PullJob *roothash_job, | |
373 | PullJob *settings_job, | |
374 | PullJob *checksum_job, | |
375 | PullJob *signature_job) { | |
9854730b | 376 | |
91359193 | 377 | _cleanup_close_pair_ int gpg_pipe[2] = { -1, -1 }; |
91359193 LP |
378 | _cleanup_close_ int sig_file = -1; |
379 | char sig_file_path[] = "/tmp/sigXXXXXX", gpg_home[] = "/tmp/gpghomeXXXXXX"; | |
380 | _cleanup_(sigkill_waitp) pid_t pid = 0; | |
381 | bool gpg_home_created = false; | |
382 | int r; | |
9854730b | 383 | |
91359193 LP |
384 | assert(main_job); |
385 | assert(main_job->state == PULL_JOB_DONE); | |
9854730b | 386 | |
91359193 LP |
387 | if (!checksum_job) |
388 | return 0; | |
9854730b | 389 | |
91359193 LP |
390 | assert(main_job->calc_checksum); |
391 | assert(main_job->checksum); | |
9854730b | 392 | |
91359193 | 393 | assert(checksum_job->state == PULL_JOB_DONE); |
9854730b | 394 | |
91359193 LP |
395 | if (!checksum_job->payload || checksum_job->payload_size <= 0) { |
396 | log_error("Checksum is empty, cannot verify."); | |
397 | return -EBADMSG; | |
398 | } | |
9854730b | 399 | |
91359193 LP |
400 | r = verify_one(checksum_job, main_job); |
401 | if (r < 0) | |
402 | return r; | |
9854730b | 403 | |
91359193 LP |
404 | r = verify_one(checksum_job, roothash_job); |
405 | if (r < 0) | |
406 | return r; | |
9854730b | 407 | |
91359193 LP |
408 | r = verify_one(checksum_job, settings_job); |
409 | if (r < 0) | |
410 | return r; | |
9854730b | 411 | |
98c38001 LP |
412 | if (!signature_job) |
413 | return 0; | |
414 | ||
697be0be TB |
415 | if (checksum_job->style == VERIFICATION_PER_FILE) |
416 | signature_job = checksum_job; | |
417 | ||
dc2c282b | 418 | assert(signature_job->state == PULL_JOB_DONE); |
98c38001 LP |
419 | |
420 | if (!signature_job->payload || signature_job->payload_size <= 0) { | |
421 | log_error("Signature is empty, cannot verify."); | |
422 | return -EBADMSG; | |
423 | } | |
424 | ||
425 | r = pipe2(gpg_pipe, O_CLOEXEC); | |
426 | if (r < 0) | |
0100b6e1 | 427 | return log_error_errno(errno, "Failed to create pipe for gpg: %m"); |
98c38001 LP |
428 | |
429 | sig_file = mkostemp(sig_file_path, O_RDWR); | |
430 | if (sig_file < 0) | |
431 | return log_error_errno(errno, "Failed to create temporary file: %m"); | |
432 | ||
433 | r = loop_write(sig_file, signature_job->payload, signature_job->payload_size, false); | |
434 | if (r < 0) { | |
435 | log_error_errno(r, "Failed to write to temporary file: %m"); | |
436 | goto finish; | |
437 | } | |
438 | ||
0acfdffe LP |
439 | if (!mkdtemp(gpg_home)) { |
440 | r = log_error_errno(errno, "Failed to create tempory home for gpg: %m"); | |
441 | goto finish; | |
442 | } | |
443 | ||
444 | gpg_home_created = true; | |
445 | ||
b6e1fff1 | 446 | r = safe_fork("(gpg)", FORK_RESET_SIGNALS|FORK_DEATHSIG|FORK_LOG, &pid); |
4c253ed1 | 447 | if (r < 0) |
b6e1fff1 | 448 | return r; |
4c253ed1 | 449 | if (r == 0) { |
98c38001 LP |
450 | const char *cmd[] = { |
451 | "gpg", | |
452 | "--no-options", | |
453 | "--no-default-keyring", | |
454 | "--no-auto-key-locate", | |
455 | "--no-auto-check-trustdb", | |
456 | "--batch", | |
457 | "--trust-model=always", | |
0acfdffe LP |
458 | NULL, /* --homedir= */ |
459 | NULL, /* --keyring= */ | |
98c38001 LP |
460 | NULL, /* --verify */ |
461 | NULL, /* signature file */ | |
462 | NULL, /* dash */ | |
463 | NULL /* trailing NULL */ | |
464 | }; | |
0acfdffe | 465 | unsigned k = ELEMENTSOF(cmd) - 6; |
98c38001 LP |
466 | |
467 | /* Child */ | |
468 | ||
98c38001 LP |
469 | gpg_pipe[1] = safe_close(gpg_pipe[1]); |
470 | ||
2b33ab09 | 471 | r = rearrange_stdio(gpg_pipe[0], -1, STDERR_FILENO); |
046a82c1 | 472 | if (r < 0) { |
2b33ab09 | 473 | log_error_errno(r, "Failed to rearrange stdin/stdout: %m"); |
98c38001 LP |
474 | _exit(EXIT_FAILURE); |
475 | } | |
476 | ||
0acfdffe LP |
477 | cmd[k++] = strjoina("--homedir=", gpg_home); |
478 | ||
98c38001 LP |
479 | /* We add the user keyring only to the command line |
480 | * arguments, if it's around since gpg fails | |
481 | * otherwise. */ | |
482 | if (access(USER_KEYRING_PATH, F_OK) >= 0) | |
483 | cmd[k++] = "--keyring=" USER_KEYRING_PATH; | |
1c49d1ba LP |
484 | else |
485 | cmd[k++] = "--keyring=" VENDOR_KEYRING_PATH; | |
98c38001 LP |
486 | |
487 | cmd[k++] = "--verify"; | |
697be0be TB |
488 | if (checksum_job->style == VERIFICATION_PER_DIRECTORY) { |
489 | cmd[k++] = sig_file_path; | |
490 | cmd[k++] = "-"; | |
491 | cmd[k++] = NULL; | |
492 | } | |
98c38001 | 493 | |
0acfdffe | 494 | execvp("gpg2", (char * const *) cmd); |
98c38001 LP |
495 | execvp("gpg", (char * const *) cmd); |
496 | log_error_errno(errno, "Failed to execute gpg: %m"); | |
497 | _exit(EXIT_FAILURE); | |
498 | } | |
499 | ||
500 | gpg_pipe[0] = safe_close(gpg_pipe[0]); | |
501 | ||
502 | r = loop_write(gpg_pipe[1], checksum_job->payload, checksum_job->payload_size, false); | |
503 | if (r < 0) { | |
504 | log_error_errno(r, "Failed to write to pipe: %m"); | |
505 | goto finish; | |
506 | } | |
507 | ||
508 | gpg_pipe[1] = safe_close(gpg_pipe[1]); | |
509 | ||
7d4904fe | 510 | r = wait_for_terminate_and_check("gpg", pid, WAIT_LOG_ABNORMAL); |
98c38001 LP |
511 | pid = 0; |
512 | if (r < 0) | |
513 | goto finish; | |
b4a34311 | 514 | if (r != EXIT_SUCCESS) { |
9854730b | 515 | log_error("DOWNLOAD INVALID: Signature verification failed."); |
98c38001 LP |
516 | r = -EBADMSG; |
517 | } else { | |
518 | log_info("Signature verification succeeded."); | |
519 | r = 0; | |
520 | } | |
521 | ||
522 | finish: | |
d61b34f1 | 523 | (void) unlink(sig_file_path); |
98c38001 | 524 | |
0acfdffe | 525 | if (gpg_home_created) |
c6878637 | 526 | (void) rm_rf(gpg_home, REMOVE_ROOT|REMOVE_PHYSICAL); |
0acfdffe | 527 | |
98c38001 LP |
528 | return r; |
529 | } |