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56ebfaf1 LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2015 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
98c38001 LP |
22 | #include <sys/prctl.h> |
23 | ||
56ebfaf1 | 24 | #include "btrfs-util.h" |
2c140ded | 25 | #include "capability.h" |
4f5dd394 | 26 | #include "copy.h" |
a0956174 | 27 | #include "dirent-util.h" |
4f5dd394 | 28 | #include "escape.h" |
3ffd4af2 | 29 | #include "fd-util.h" |
c004493c | 30 | #include "io-util.h" |
bb15fafe | 31 | #include "path-util.h" |
0b452006 | 32 | #include "process-util.h" |
3ffd4af2 | 33 | #include "pull-common.h" |
4f5dd394 LP |
34 | #include "pull-job.h" |
35 | #include "rm-rf.h" | |
24882e06 | 36 | #include "signal-util.h" |
9818005d | 37 | #include "siphash24.h" |
07630cea | 38 | #include "string-util.h" |
4f5dd394 LP |
39 | #include "strv.h" |
40 | #include "util.h" | |
56ebfaf1 LP |
41 | |
42 | #define FILENAME_ESCAPE "/.#\"\'" | |
9818005d | 43 | #define HASH_URL_THRESHOLD_LENGTH (_POSIX_PATH_MAX - 16) |
56ebfaf1 | 44 | |
9854730b LP |
45 | int pull_find_old_etags( |
46 | const char *url, | |
47 | const char *image_root, | |
48 | int dt, | |
49 | const char *prefix, | |
50 | const char *suffix, | |
51 | char ***etags) { | |
52 | ||
56ebfaf1 LP |
53 | _cleanup_free_ char *escaped_url = NULL; |
54 | _cleanup_closedir_ DIR *d = NULL; | |
55 | _cleanup_strv_free_ char **l = NULL; | |
56 | struct dirent *de; | |
57 | int r; | |
58 | ||
59 | assert(url); | |
60 | assert(etags); | |
61 | ||
62 | if (!image_root) | |
63 | image_root = "/var/lib/machines"; | |
64 | ||
65 | escaped_url = xescape(url, FILENAME_ESCAPE); | |
66 | if (!escaped_url) | |
67 | return -ENOMEM; | |
68 | ||
69 | d = opendir(image_root); | |
70 | if (!d) { | |
71 | if (errno == ENOENT) { | |
72 | *etags = NULL; | |
73 | return 0; | |
74 | } | |
75 | ||
76 | return -errno; | |
77 | } | |
78 | ||
79 | FOREACH_DIRENT_ALL(de, d, return -errno) { | |
80 | const char *a, *b; | |
81 | char *u; | |
82 | ||
83 | if (de->d_type != DT_UNKNOWN && | |
84 | de->d_type != dt) | |
85 | continue; | |
86 | ||
87 | if (prefix) { | |
88 | a = startswith(de->d_name, prefix); | |
89 | if (!a) | |
90 | continue; | |
91 | } else | |
92 | a = de->d_name; | |
93 | ||
94 | a = startswith(a, escaped_url); | |
95 | if (!a) | |
96 | continue; | |
97 | ||
98 | a = startswith(a, "."); | |
99 | if (!a) | |
100 | continue; | |
101 | ||
102 | if (suffix) { | |
103 | b = endswith(de->d_name, suffix); | |
104 | if (!b) | |
105 | continue; | |
106 | } else | |
107 | b = strchr(de->d_name, 0); | |
108 | ||
109 | if (a >= b) | |
110 | continue; | |
111 | ||
527b7a42 LP |
112 | r = cunescape_length(a, b - a, 0, &u); |
113 | if (r < 0) | |
114 | return r; | |
56ebfaf1 LP |
115 | |
116 | if (!http_etag_is_valid(u)) { | |
117 | free(u); | |
118 | continue; | |
119 | } | |
120 | ||
121 | r = strv_consume(&l, u); | |
122 | if (r < 0) | |
123 | return r; | |
124 | } | |
125 | ||
126 | *etags = l; | |
127 | l = NULL; | |
128 | ||
129 | return 0; | |
130 | } | |
131 | ||
dc2c282b | 132 | int pull_make_local_copy(const char *final, const char *image_root, const char *local, bool force_local) { |
56ebfaf1 LP |
133 | const char *p; |
134 | int r; | |
135 | ||
136 | assert(final); | |
137 | assert(local); | |
138 | ||
139 | if (!image_root) | |
140 | image_root = "/var/lib/machines"; | |
141 | ||
63c372cb | 142 | p = strjoina(image_root, "/", local); |
56ebfaf1 | 143 | |
d9e2daaf LP |
144 | if (force_local) |
145 | (void) rm_rf(p, REMOVE_ROOT|REMOVE_PHYSICAL|REMOVE_SUBVOLUME); | |
56ebfaf1 | 146 | |
5bcd08db | 147 | r = btrfs_subvol_snapshot(final, p, BTRFS_SNAPSHOT_QUOTA); |
56ebfaf1 LP |
148 | if (r == -ENOTTY) { |
149 | r = copy_tree(final, p, false); | |
150 | if (r < 0) | |
151 | return log_error_errno(r, "Failed to copy image: %m"); | |
152 | } else if (r < 0) | |
153 | return log_error_errno(r, "Failed to create local image: %m"); | |
154 | ||
155 | log_info("Created new local image '%s'.", local); | |
156 | ||
157 | return 0; | |
158 | } | |
159 | ||
9818005d JS |
160 | static int hash_url(const char *url, char **ret) { |
161 | uint64_t h; | |
162 | 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); | |
163 | ||
164 | assert(url); | |
165 | ||
166 | siphash24((uint8_t *) &h, url, strlen(url), k.bytes); | |
167 | if (asprintf(ret, "%"PRIx64, h) < 0) | |
168 | return -ENOMEM; | |
169 | ||
170 | return 0; | |
171 | } | |
172 | ||
dc2c282b | 173 | int pull_make_path(const char *url, const char *etag, const char *image_root, const char *prefix, const char *suffix, char **ret) { |
9818005d | 174 | _cleanup_free_ char *escaped_url = NULL, *escaped_etag = NULL; |
56ebfaf1 LP |
175 | char *path; |
176 | ||
177 | assert(url); | |
178 | assert(ret); | |
179 | ||
180 | if (!image_root) | |
181 | image_root = "/var/lib/machines"; | |
182 | ||
183 | escaped_url = xescape(url, FILENAME_ESCAPE); | |
184 | if (!escaped_url) | |
185 | return -ENOMEM; | |
186 | ||
187 | if (etag) { | |
56ebfaf1 LP |
188 | escaped_etag = xescape(etag, FILENAME_ESCAPE); |
189 | if (!escaped_etag) | |
190 | return -ENOMEM; | |
9818005d | 191 | } |
56ebfaf1 | 192 | |
9818005d JS |
193 | path = strjoin(image_root, "/", strempty(prefix), escaped_url, escaped_etag ? "." : "", |
194 | strempty(escaped_etag), strempty(suffix), NULL); | |
56ebfaf1 LP |
195 | if (!path) |
196 | return -ENOMEM; | |
197 | ||
9818005d JS |
198 | /* URLs might make the path longer than the maximum allowed length for a file name. |
199 | * When that happens, a URL hash is used instead. Paths returned by this function | |
200 | * can be later used with tempfn_random() which adds 16 bytes to the resulting name. */ | |
201 | if (strlen(path) >= HASH_URL_THRESHOLD_LENGTH) { | |
202 | _cleanup_free_ char *hash = NULL; | |
203 | int r; | |
204 | ||
205 | free(path); | |
206 | ||
207 | r = hash_url(url, &hash); | |
208 | if (r < 0) | |
209 | return r; | |
210 | ||
211 | path = strjoin(image_root, "/", strempty(prefix), hash, escaped_etag ? "." : "", | |
212 | strempty(escaped_etag), strempty(suffix), NULL); | |
213 | if (!path) | |
214 | return -ENOMEM; | |
215 | } | |
216 | ||
56ebfaf1 LP |
217 | *ret = path; |
218 | return 0; | |
219 | } | |
85dbc41d | 220 | |
9854730b LP |
221 | int pull_make_settings_job( |
222 | PullJob **ret, | |
223 | const char *url, | |
224 | CurlGlue *glue, | |
225 | PullJobFinished on_finished, | |
226 | void *userdata) { | |
227 | ||
228 | _cleanup_free_ char *last_component = NULL, *ll = NULL, *settings_url = NULL; | |
229 | _cleanup_(pull_job_unrefp) PullJob *job = NULL; | |
230 | const char *q; | |
231 | int r; | |
232 | ||
233 | assert(ret); | |
234 | assert(url); | |
235 | assert(glue); | |
236 | ||
237 | r = import_url_last_component(url, &last_component); | |
238 | if (r < 0) | |
239 | return r; | |
240 | ||
241 | r = tar_strip_suffixes(last_component, &ll); | |
242 | if (r < 0) | |
243 | return r; | |
244 | ||
245 | q = strjoina(ll, ".nspawn"); | |
246 | ||
247 | r = import_url_change_last_component(url, q, &settings_url); | |
248 | if (r < 0) | |
249 | return r; | |
250 | ||
251 | r = pull_job_new(&job, settings_url, glue, userdata); | |
252 | if (r < 0) | |
253 | return r; | |
254 | ||
255 | job->on_finished = on_finished; | |
256 | job->compressed_max = job->uncompressed_max = 1ULL * 1024ULL * 1024ULL; | |
257 | ||
258 | *ret = job; | |
259 | job = NULL; | |
260 | ||
261 | return 0; | |
262 | } | |
263 | ||
dc2c282b LP |
264 | int pull_make_verification_jobs( |
265 | PullJob **ret_checksum_job, | |
266 | PullJob **ret_signature_job, | |
98c38001 LP |
267 | ImportVerify verify, |
268 | const char *url, | |
269 | CurlGlue *glue, | |
dc2c282b | 270 | PullJobFinished on_finished, |
98c38001 LP |
271 | void *userdata) { |
272 | ||
dc2c282b | 273 | _cleanup_(pull_job_unrefp) PullJob *checksum_job = NULL, *signature_job = NULL; |
98c38001 LP |
274 | int r; |
275 | ||
276 | assert(ret_checksum_job); | |
277 | assert(ret_signature_job); | |
278 | assert(verify >= 0); | |
279 | assert(verify < _IMPORT_VERIFY_MAX); | |
280 | assert(url); | |
281 | assert(glue); | |
282 | ||
283 | if (verify != IMPORT_VERIFY_NO) { | |
284 | _cleanup_free_ char *checksum_url = NULL; | |
285 | ||
286 | /* Queue job for the SHA256SUMS file for the image */ | |
287 | r = import_url_change_last_component(url, "SHA256SUMS", &checksum_url); | |
288 | if (r < 0) | |
289 | return r; | |
290 | ||
dc2c282b | 291 | r = pull_job_new(&checksum_job, checksum_url, glue, userdata); |
98c38001 LP |
292 | if (r < 0) |
293 | return r; | |
294 | ||
295 | checksum_job->on_finished = on_finished; | |
296 | checksum_job->uncompressed_max = checksum_job->compressed_max = 1ULL * 1024ULL * 1024ULL; | |
297 | } | |
298 | ||
299 | if (verify == IMPORT_VERIFY_SIGNATURE) { | |
300 | _cleanup_free_ char *signature_url = NULL; | |
301 | ||
302 | /* Queue job for the SHA256SUMS.gpg file for the image. */ | |
303 | r = import_url_change_last_component(url, "SHA256SUMS.gpg", &signature_url); | |
304 | if (r < 0) | |
305 | return r; | |
306 | ||
dc2c282b | 307 | r = pull_job_new(&signature_job, signature_url, glue, userdata); |
98c38001 LP |
308 | if (r < 0) |
309 | return r; | |
310 | ||
311 | signature_job->on_finished = on_finished; | |
312 | signature_job->uncompressed_max = signature_job->compressed_max = 1ULL * 1024ULL * 1024ULL; | |
313 | } | |
314 | ||
315 | *ret_checksum_job = checksum_job; | |
316 | *ret_signature_job = signature_job; | |
317 | ||
318 | checksum_job = signature_job = NULL; | |
319 | ||
320 | return 0; | |
321 | } | |
322 | ||
9854730b LP |
323 | int pull_verify(PullJob *main_job, |
324 | PullJob *settings_job, | |
dc2c282b LP |
325 | PullJob *checksum_job, |
326 | PullJob *signature_job) { | |
98c38001 LP |
327 | |
328 | _cleanup_close_pair_ int gpg_pipe[2] = { -1, -1 }; | |
329 | _cleanup_free_ char *fn = NULL; | |
330 | _cleanup_close_ int sig_file = -1; | |
331 | const char *p, *line; | |
0acfdffe | 332 | char sig_file_path[] = "/tmp/sigXXXXXX", gpg_home[] = "/tmp/gpghomeXXXXXX"; |
98c38001 | 333 | _cleanup_sigkill_wait_ pid_t pid = 0; |
0acfdffe | 334 | bool gpg_home_created = false; |
98c38001 LP |
335 | int r; |
336 | ||
337 | assert(main_job); | |
dc2c282b | 338 | assert(main_job->state == PULL_JOB_DONE); |
98c38001 LP |
339 | |
340 | if (!checksum_job) | |
341 | return 0; | |
342 | ||
343 | assert(main_job->calc_checksum); | |
344 | assert(main_job->checksum); | |
dc2c282b | 345 | assert(checksum_job->state == PULL_JOB_DONE); |
98c38001 LP |
346 | |
347 | if (!checksum_job->payload || checksum_job->payload_size <= 0) { | |
348 | log_error("Checksum is empty, cannot verify."); | |
349 | return -EBADMSG; | |
350 | } | |
351 | ||
352 | r = import_url_last_component(main_job->url, &fn); | |
353 | if (r < 0) | |
354 | return log_oom(); | |
355 | ||
356 | if (!filename_is_valid(fn)) { | |
357 | log_error("Cannot verify checksum, could not determine valid server-side file name."); | |
358 | return -EBADMSG; | |
359 | } | |
360 | ||
63c372cb | 361 | line = strjoina(main_job->checksum, " *", fn, "\n"); |
98c38001 LP |
362 | |
363 | p = memmem(checksum_job->payload, | |
364 | checksum_job->payload_size, | |
365 | line, | |
366 | strlen(line)); | |
367 | ||
368 | if (!p || (p != (char*) checksum_job->payload && p[-1] != '\n')) { | |
9c00a6ad | 369 | log_error("DOWNLOAD INVALID: Checksum did not check out, payload has been tampered with."); |
98c38001 LP |
370 | return -EBADMSG; |
371 | } | |
372 | ||
373 | log_info("SHA256 checksum of %s is valid.", main_job->url); | |
374 | ||
1f9aa80a | 375 | assert(!settings_job || IN_SET(settings_job->state, PULL_JOB_DONE, PULL_JOB_FAILED)); |
9854730b LP |
376 | |
377 | if (settings_job && | |
1f9aa80a | 378 | settings_job->state == PULL_JOB_DONE && |
9854730b LP |
379 | settings_job->error == 0 && |
380 | !settings_job->etag_exists) { | |
381 | ||
382 | _cleanup_free_ char *settings_fn = NULL; | |
383 | ||
384 | assert(settings_job->calc_checksum); | |
385 | assert(settings_job->checksum); | |
386 | ||
387 | r = import_url_last_component(settings_job->url, &settings_fn); | |
388 | if (r < 0) | |
389 | return log_oom(); | |
390 | ||
391 | if (!filename_is_valid(settings_fn)) { | |
392 | log_error("Cannot verify checksum, could not determine server-side settings file name."); | |
393 | return -EBADMSG; | |
394 | } | |
395 | ||
396 | line = strjoina(settings_job->checksum, " *", settings_fn, "\n"); | |
397 | ||
398 | p = memmem(checksum_job->payload, | |
399 | checksum_job->payload_size, | |
400 | line, | |
401 | strlen(line)); | |
402 | ||
403 | if (!p || (p != (char*) checksum_job->payload && p[-1] != '\n')) { | |
9c00a6ad | 404 | log_error("DOWNLOAD INVALID: Checksum of settings file did not checkout, settings file has been tampered with."); |
9854730b LP |
405 | return -EBADMSG; |
406 | } | |
407 | ||
408 | log_info("SHA256 checksum of %s is valid.", settings_job->url); | |
409 | } | |
410 | ||
98c38001 LP |
411 | if (!signature_job) |
412 | return 0; | |
413 | ||
dc2c282b | 414 | assert(signature_job->state == PULL_JOB_DONE); |
98c38001 LP |
415 | |
416 | if (!signature_job->payload || signature_job->payload_size <= 0) { | |
417 | log_error("Signature is empty, cannot verify."); | |
418 | return -EBADMSG; | |
419 | } | |
420 | ||
421 | r = pipe2(gpg_pipe, O_CLOEXEC); | |
422 | if (r < 0) | |
0100b6e1 | 423 | return log_error_errno(errno, "Failed to create pipe for gpg: %m"); |
98c38001 LP |
424 | |
425 | sig_file = mkostemp(sig_file_path, O_RDWR); | |
426 | if (sig_file < 0) | |
427 | return log_error_errno(errno, "Failed to create temporary file: %m"); | |
428 | ||
429 | r = loop_write(sig_file, signature_job->payload, signature_job->payload_size, false); | |
430 | if (r < 0) { | |
431 | log_error_errno(r, "Failed to write to temporary file: %m"); | |
432 | goto finish; | |
433 | } | |
434 | ||
0acfdffe LP |
435 | if (!mkdtemp(gpg_home)) { |
436 | r = log_error_errno(errno, "Failed to create tempory home for gpg: %m"); | |
437 | goto finish; | |
438 | } | |
439 | ||
440 | gpg_home_created = true; | |
441 | ||
98c38001 LP |
442 | pid = fork(); |
443 | if (pid < 0) | |
444 | return log_error_errno(errno, "Failed to fork off gpg: %m"); | |
445 | if (pid == 0) { | |
446 | const char *cmd[] = { | |
447 | "gpg", | |
448 | "--no-options", | |
449 | "--no-default-keyring", | |
450 | "--no-auto-key-locate", | |
451 | "--no-auto-check-trustdb", | |
452 | "--batch", | |
453 | "--trust-model=always", | |
0acfdffe LP |
454 | NULL, /* --homedir= */ |
455 | NULL, /* --keyring= */ | |
98c38001 LP |
456 | NULL, /* --verify */ |
457 | NULL, /* signature file */ | |
458 | NULL, /* dash */ | |
459 | NULL /* trailing NULL */ | |
460 | }; | |
0acfdffe | 461 | unsigned k = ELEMENTSOF(cmd) - 6; |
98c38001 LP |
462 | int null_fd; |
463 | ||
464 | /* Child */ | |
465 | ||
ce30c8dc LP |
466 | (void) reset_all_signal_handlers(); |
467 | (void) reset_signal_mask(); | |
98c38001 LP |
468 | assert_se(prctl(PR_SET_PDEATHSIG, SIGTERM) == 0); |
469 | ||
470 | gpg_pipe[1] = safe_close(gpg_pipe[1]); | |
471 | ||
472 | if (dup2(gpg_pipe[0], STDIN_FILENO) != STDIN_FILENO) { | |
473 | log_error_errno(errno, "Failed to dup2() fd: %m"); | |
474 | _exit(EXIT_FAILURE); | |
475 | } | |
476 | ||
477 | if (gpg_pipe[0] != STDIN_FILENO) | |
478 | gpg_pipe[0] = safe_close(gpg_pipe[0]); | |
479 | ||
480 | null_fd = open("/dev/null", O_WRONLY|O_NOCTTY); | |
481 | if (null_fd < 0) { | |
482 | log_error_errno(errno, "Failed to open /dev/null: %m"); | |
483 | _exit(EXIT_FAILURE); | |
484 | } | |
485 | ||
486 | if (dup2(null_fd, STDOUT_FILENO) != STDOUT_FILENO) { | |
487 | log_error_errno(errno, "Failed to dup2() fd: %m"); | |
488 | _exit(EXIT_FAILURE); | |
489 | } | |
490 | ||
491 | if (null_fd != STDOUT_FILENO) | |
492 | null_fd = safe_close(null_fd); | |
493 | ||
0acfdffe LP |
494 | cmd[k++] = strjoina("--homedir=", gpg_home); |
495 | ||
98c38001 LP |
496 | /* We add the user keyring only to the command line |
497 | * arguments, if it's around since gpg fails | |
498 | * otherwise. */ | |
499 | if (access(USER_KEYRING_PATH, F_OK) >= 0) | |
500 | cmd[k++] = "--keyring=" USER_KEYRING_PATH; | |
1c49d1ba LP |
501 | else |
502 | cmd[k++] = "--keyring=" VENDOR_KEYRING_PATH; | |
98c38001 LP |
503 | |
504 | cmd[k++] = "--verify"; | |
505 | cmd[k++] = sig_file_path; | |
506 | cmd[k++] = "-"; | |
507 | cmd[k++] = NULL; | |
508 | ||
3d7415f4 LP |
509 | fd_cloexec(STDIN_FILENO, false); |
510 | fd_cloexec(STDOUT_FILENO, false); | |
511 | fd_cloexec(STDERR_FILENO, false); | |
512 | ||
0acfdffe | 513 | execvp("gpg2", (char * const *) cmd); |
98c38001 LP |
514 | execvp("gpg", (char * const *) cmd); |
515 | log_error_errno(errno, "Failed to execute gpg: %m"); | |
516 | _exit(EXIT_FAILURE); | |
517 | } | |
518 | ||
519 | gpg_pipe[0] = safe_close(gpg_pipe[0]); | |
520 | ||
521 | r = loop_write(gpg_pipe[1], checksum_job->payload, checksum_job->payload_size, false); | |
522 | if (r < 0) { | |
523 | log_error_errno(r, "Failed to write to pipe: %m"); | |
524 | goto finish; | |
525 | } | |
526 | ||
527 | gpg_pipe[1] = safe_close(gpg_pipe[1]); | |
528 | ||
529 | r = wait_for_terminate_and_warn("gpg", pid, true); | |
530 | pid = 0; | |
531 | if (r < 0) | |
532 | goto finish; | |
533 | if (r > 0) { | |
9854730b | 534 | log_error("DOWNLOAD INVALID: Signature verification failed."); |
98c38001 LP |
535 | r = -EBADMSG; |
536 | } else { | |
537 | log_info("Signature verification succeeded."); | |
538 | r = 0; | |
539 | } | |
540 | ||
541 | finish: | |
542 | if (sig_file >= 0) | |
9854730b | 543 | (void) unlink(sig_file_path); |
98c38001 | 544 | |
0acfdffe | 545 | if (gpg_home_created) |
c6878637 | 546 | (void) rm_rf(gpg_home, REMOVE_ROOT|REMOVE_PHYSICAL); |
0acfdffe | 547 | |
98c38001 LP |
548 | return r; |
549 | } |