2 This file is part of systemd.
4 Copyright 2015 Lennart Poettering
6 systemd is free software; you can redistribute it and/or modify it
7 under the terms of the GNU Lesser General Public License as published by
8 the Free Software Foundation; either version 2.1 of the License, or
9 (at your option) any later version.
11 systemd is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public License
17 along with systemd; If not, see <http://www.gnu.org/licenses/>.
20 #include <sys/prctl.h>
22 #include "alloc-util.h"
23 #include "btrfs-util.h"
24 #include "capability-util.h"
26 #include "dirent-util.h"
30 #include "path-util.h"
31 #include "process-util.h"
32 #include "pull-common.h"
35 #include "signal-util.h"
36 #include "siphash24.h"
37 #include "string-util.h"
42 #define FILENAME_ESCAPE "/.#\"\'"
43 #define HASH_URL_THRESHOLD_LENGTH (_POSIX_PATH_MAX - 16)
45 int pull_find_old_etags(
47 const char *image_root
,
53 _cleanup_free_
char *escaped_url
= NULL
;
54 _cleanup_closedir_
DIR *d
= NULL
;
55 _cleanup_strv_free_
char **l
= NULL
;
63 image_root
= "/var/lib/machines";
65 escaped_url
= xescape(url
, FILENAME_ESCAPE
);
69 d
= opendir(image_root
);
71 if (errno
== ENOENT
) {
79 FOREACH_DIRENT_ALL(de
, d
, return -errno
) {
83 if (de
->d_type
!= DT_UNKNOWN
&&
88 a
= startswith(de
->d_name
, prefix
);
94 a
= startswith(a
, escaped_url
);
98 a
= startswith(a
, ".");
103 b
= endswith(de
->d_name
, suffix
);
107 b
= strchr(de
->d_name
, 0);
112 r
= cunescape_length(a
, b
- a
, 0, &u
);
116 if (!http_etag_is_valid(u
)) {
121 r
= strv_consume(&l
, u
);
132 int pull_make_local_copy(const char *final
, const char *image_root
, const char *local
, bool force_local
) {
140 image_root
= "/var/lib/machines";
142 p
= strjoina(image_root
, "/", local
);
145 (void) rm_rf(p
, REMOVE_ROOT
|REMOVE_PHYSICAL
|REMOVE_SUBVOLUME
);
147 r
= btrfs_subvol_snapshot(final
, p
,
148 BTRFS_SNAPSHOT_QUOTA
|
149 BTRFS_SNAPSHOT_FALLBACK_COPY
|
150 BTRFS_SNAPSHOT_FALLBACK_DIRECTORY
|
151 BTRFS_SNAPSHOT_RECURSIVE
);
153 return log_error_errno(r
, "Failed to create local image: %m");
155 log_info("Created new local image '%s'.", local
);
160 static int hash_url(const char *url
, char **ret
) {
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
);
166 h
= siphash24(url
, strlen(url
), k
.bytes
);
167 if (asprintf(ret
, "%"PRIx64
, h
) < 0)
173 int pull_make_path(const char *url
, const char *etag
, const char *image_root
, const char *prefix
, const char *suffix
, char **ret
) {
174 _cleanup_free_
char *escaped_url
= NULL
, *escaped_etag
= NULL
;
181 image_root
= "/var/lib/machines";
183 escaped_url
= xescape(url
, FILENAME_ESCAPE
);
188 escaped_etag
= xescape(etag
, FILENAME_ESCAPE
);
193 path
= strjoin(image_root
, "/", strempty(prefix
), escaped_url
, escaped_etag
? "." : "",
194 strempty(escaped_etag
), strempty(suffix
), NULL
);
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
;
207 r
= hash_url(url
, &hash
);
211 path
= strjoin(image_root
, "/", strempty(prefix
), hash
, escaped_etag
? "." : "",
212 strempty(escaped_etag
), strempty(suffix
), NULL
);
221 int pull_make_auxiliary_job(
224 int (*strip_suffixes
)(const char *name
, char **ret
),
227 PullJobFinished on_finished
,
230 _cleanup_free_
char *last_component
= NULL
, *ll
= NULL
, *auxiliary_url
= NULL
;
231 _cleanup_(pull_job_unrefp
) PullJob
*job
= NULL
;
237 assert(strip_suffixes
);
240 r
= import_url_last_component(url
, &last_component
);
244 r
= strip_suffixes(last_component
, &ll
);
248 q
= strjoina(ll
, suffix
);
250 r
= import_url_change_last_component(url
, q
, &auxiliary_url
);
254 r
= pull_job_new(&job
, auxiliary_url
, glue
, userdata
);
258 job
->on_finished
= on_finished
;
259 job
->compressed_max
= job
->uncompressed_max
= 1ULL * 1024ULL * 1024ULL;
267 int pull_make_verification_jobs(
268 PullJob
**ret_checksum_job
,
269 PullJob
**ret_signature_job
,
273 PullJobFinished on_finished
,
276 _cleanup_(pull_job_unrefp
) PullJob
*checksum_job
= NULL
, *signature_job
= NULL
;
278 const char *chksums
= NULL
;
280 assert(ret_checksum_job
);
281 assert(ret_signature_job
);
283 assert(verify
< _IMPORT_VERIFY_MAX
);
287 if (verify
!= IMPORT_VERIFY_NO
) {
288 _cleanup_free_
char *checksum_url
= NULL
, *fn
= NULL
;
290 /* Queue jobs for the checksum file for the image. */
291 r
= import_url_last_component(url
, &fn
);
295 chksums
= strjoina(fn
, ".sha256");
297 r
= import_url_change_last_component(url
, chksums
, &checksum_url
);
301 r
= pull_job_new(&checksum_job
, checksum_url
, glue
, userdata
);
305 checksum_job
->on_finished
= on_finished
;
306 checksum_job
->uncompressed_max
= checksum_job
->compressed_max
= 1ULL * 1024ULL * 1024ULL;
309 if (verify
== IMPORT_VERIFY_SIGNATURE
) {
310 _cleanup_free_
char *signature_url
= NULL
;
312 /* Queue job for the SHA256SUMS.gpg file for the image. */
313 r
= import_url_change_last_component(url
, "SHA256SUMS.gpg", &signature_url
);
317 r
= pull_job_new(&signature_job
, signature_url
, glue
, userdata
);
321 signature_job
->on_finished
= on_finished
;
322 signature_job
->uncompressed_max
= signature_job
->compressed_max
= 1ULL * 1024ULL * 1024ULL;
325 *ret_checksum_job
= checksum_job
;
326 *ret_signature_job
= signature_job
;
328 checksum_job
= signature_job
= NULL
;
333 static int verify_one(PullJob
*checksum_job
, PullJob
*job
) {
334 _cleanup_free_
char *fn
= NULL
;
335 const char *line
, *p
;
338 assert(checksum_job
);
343 assert(IN_SET(job
->state
, PULL_JOB_DONE
, PULL_JOB_FAILED
));
345 /* Don't verify the checksum if we didn't actually successfully download something new */
346 if (job
->state
!= PULL_JOB_DONE
)
350 if (job
->etag_exists
)
353 assert(job
->calc_checksum
);
354 assert(job
->checksum
);
356 r
= import_url_last_component(job
->url
, &fn
);
360 if (!filename_is_valid(fn
)) {
361 log_error("Cannot verify checksum, could not determine server-side file name.");
365 line
= strjoina(job
->checksum
, " *", fn
, "\n");
367 p
= memmem(checksum_job
->payload
,
368 checksum_job
->payload_size
,
373 line
= strjoina(job
->checksum
, " ", fn
, "\n");
375 p
= memmem(checksum_job
->payload
,
376 checksum_job
->payload_size
,
381 if (!p
|| (p
!= (char*) checksum_job
->payload
&& p
[-1] != '\n')) {
382 log_error("DOWNLOAD INVALID: Checksum of %s file did not checkout, file has been tampered with.", fn
);
386 log_info("SHA256 checksum of %s is valid.", job
->url
);
390 int pull_verify(PullJob
*main_job
,
391 PullJob
*roothash_job
,
392 PullJob
*settings_job
,
393 PullJob
*checksum_job
,
394 PullJob
*signature_job
) {
396 _cleanup_close_pair_
int gpg_pipe
[2] = { -1, -1 };
397 _cleanup_close_
int sig_file
= -1;
398 char sig_file_path
[] = "/tmp/sigXXXXXX", gpg_home
[] = "/tmp/gpghomeXXXXXX";
399 _cleanup_(sigkill_waitp
) pid_t pid
= 0;
400 bool gpg_home_created
= false;
404 assert(main_job
->state
== PULL_JOB_DONE
);
409 assert(main_job
->calc_checksum
);
410 assert(main_job
->checksum
);
412 assert(checksum_job
->state
== PULL_JOB_DONE
);
414 if (!checksum_job
->payload
|| checksum_job
->payload_size
<= 0) {
415 log_error("Checksum is empty, cannot verify.");
419 r
= verify_one(checksum_job
, main_job
);
423 r
= verify_one(checksum_job
, roothash_job
);
427 r
= verify_one(checksum_job
, settings_job
);
434 if (checksum_job
->style
== VERIFICATION_PER_FILE
)
435 signature_job
= checksum_job
;
437 assert(signature_job
->state
== PULL_JOB_DONE
);
439 if (!signature_job
->payload
|| signature_job
->payload_size
<= 0) {
440 log_error("Signature is empty, cannot verify.");
444 r
= pipe2(gpg_pipe
, O_CLOEXEC
);
446 return log_error_errno(errno
, "Failed to create pipe for gpg: %m");
448 sig_file
= mkostemp(sig_file_path
, O_RDWR
);
450 return log_error_errno(errno
, "Failed to create temporary file: %m");
452 r
= loop_write(sig_file
, signature_job
->payload
, signature_job
->payload_size
, false);
454 log_error_errno(r
, "Failed to write to temporary file: %m");
458 if (!mkdtemp(gpg_home
)) {
459 r
= log_error_errno(errno
, "Failed to create tempory home for gpg: %m");
463 gpg_home_created
= true;
467 return log_error_errno(errno
, "Failed to fork off gpg: %m");
469 const char *cmd
[] = {
472 "--no-default-keyring",
473 "--no-auto-key-locate",
474 "--no-auto-check-trustdb",
476 "--trust-model=always",
477 NULL
, /* --homedir= */
478 NULL
, /* --keyring= */
480 NULL
, /* signature file */
482 NULL
/* trailing NULL */
484 unsigned k
= ELEMENTSOF(cmd
) - 6;
489 (void) reset_all_signal_handlers();
490 (void) reset_signal_mask();
491 assert_se(prctl(PR_SET_PDEATHSIG
, SIGTERM
) == 0);
493 gpg_pipe
[1] = safe_close(gpg_pipe
[1]);
495 if (dup2(gpg_pipe
[0], STDIN_FILENO
) != STDIN_FILENO
) {
496 log_error_errno(errno
, "Failed to dup2() fd: %m");
500 if (gpg_pipe
[0] != STDIN_FILENO
)
501 gpg_pipe
[0] = safe_close(gpg_pipe
[0]);
503 null_fd
= open("/dev/null", O_WRONLY
|O_NOCTTY
);
505 log_error_errno(errno
, "Failed to open /dev/null: %m");
509 if (dup2(null_fd
, STDOUT_FILENO
) != STDOUT_FILENO
) {
510 log_error_errno(errno
, "Failed to dup2() fd: %m");
514 if (null_fd
!= STDOUT_FILENO
)
515 null_fd
= safe_close(null_fd
);
517 cmd
[k
++] = strjoina("--homedir=", gpg_home
);
519 /* We add the user keyring only to the command line
520 * arguments, if it's around since gpg fails
522 if (access(USER_KEYRING_PATH
, F_OK
) >= 0)
523 cmd
[k
++] = "--keyring=" USER_KEYRING_PATH
;
525 cmd
[k
++] = "--keyring=" VENDOR_KEYRING_PATH
;
527 cmd
[k
++] = "--verify";
528 if (checksum_job
->style
== VERIFICATION_PER_DIRECTORY
) {
529 cmd
[k
++] = sig_file_path
;
534 stdio_unset_cloexec();
536 execvp("gpg2", (char * const *) cmd
);
537 execvp("gpg", (char * const *) cmd
);
538 log_error_errno(errno
, "Failed to execute gpg: %m");
542 gpg_pipe
[0] = safe_close(gpg_pipe
[0]);
544 r
= loop_write(gpg_pipe
[1], checksum_job
->payload
, checksum_job
->payload_size
, false);
546 log_error_errno(r
, "Failed to write to pipe: %m");
550 gpg_pipe
[1] = safe_close(gpg_pipe
[1]);
552 r
= wait_for_terminate_and_warn("gpg", pid
, true);
557 log_error("DOWNLOAD INVALID: Signature verification failed.");
560 log_info("Signature verification succeeded.");
566 (void) unlink(sig_file_path
);
568 if (gpg_home_created
)
569 (void) rm_rf(gpg_home
, REMOVE_ROOT
|REMOVE_PHYSICAL
);