Tor 0.4.9.0-alpha-dev
routerkeys.c
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1/* Copyright (c) 2014-2021, The Tor Project, Inc. */
2/* See LICENSE for licensing information */
3
4/**
5 * \file routerkeys.c
6 *
7 * \brief Functions and structures to handle generating and maintaining the
8 * set of keypairs necessary to be an OR.
9 *
10 * The keys handled here now are the Ed25519 keys that Tor relays use to sign
11 * descriptors, authenticate themselves on links, and identify one another
12 * uniquely. Other keys are maintained in router.c and rendservice.c.
13 *
14 * (TODO: The keys in router.c should go here too.)
15 */
16
17#include "core/or/or.h"
18#include "app/config/config.h"
24
26#include "lib/tls/tortls.h"
27#include "lib/tls/x509.h"
28
29#define ENC_KEY_HEADER "Boxed Ed25519 key"
30#define ENC_KEY_TAG "master"
31
32#ifdef HAVE_UNISTD_H
33#include <unistd.h>
34#endif
35
36static ed25519_keypair_t *master_identity_key = NULL;
37static ed25519_keypair_t *master_signing_key = NULL;
38static ed25519_keypair_t *current_auth_key = NULL;
39static tor_cert_t *signing_key_cert = NULL;
40static tor_cert_t *link_cert_cert = NULL;
41static tor_cert_t *auth_key_cert = NULL;
42
43static uint8_t *rsa_ed_crosscert = NULL;
44static size_t rsa_ed_crosscert_len = 0;
45static time_t rsa_ed_crosscert_expiration = 0;
46
47/**
48 * Running as a server: load, reload, or refresh our ed25519 keys and
49 * certificates, creating and saving new ones as needed.
50 *
51 * Return -1 on failure; 0 on success if the signing key was not replaced;
52 * and 1 on success if the signing key was replaced.
53 */
54int
55load_ed_keys(const or_options_t *options, time_t now)
56{
57 ed25519_keypair_t *id = NULL;
58 ed25519_keypair_t *sign = NULL;
59 ed25519_keypair_t *auth = NULL;
60 const ed25519_keypair_t *sign_signing_key_with_id = NULL;
61 const ed25519_keypair_t *use_signing = NULL;
62 const tor_cert_t *check_signing_cert = NULL;
63 tor_cert_t *sign_cert = NULL;
64 tor_cert_t *auth_cert = NULL;
65 int signing_key_changed = 0;
66
67 // It is later than 1972, since otherwise there would be no C compilers.
68 // (Try to diagnose #22466.)
69 tor_assert_nonfatal(now >= 2 * 365 * 86400);
70
71#define FAIL(msg) do { \
72 log_warn(LD_OR, (msg)); \
73 goto err; \
74 } while (0)
75#define SET_KEY(key, newval) do { \
76 if ((key) != (newval)) \
77 ed25519_keypair_free(key); \
78 key = (newval); \
79 } while (0)
80#define SET_CERT(cert, newval) do { \
81 if ((cert) != (newval)) \
82 tor_cert_free(cert); \
83 cert = (newval); \
84 } while (0)
85#define HAPPENS_SOON(when, interval) \
86 ((when) < now + (interval))
87#define EXPIRES_SOON(cert, interval) \
88 (!(cert) || HAPPENS_SOON((cert)->valid_until, (interval)))
89
90 /* XXXX support encrypted identity keys fully */
91
92 /* First try to get the signing key to see how it is. */
93 {
94 char *fname =
95 options_get_keydir_fname(options, "ed25519_signing");
97 fname,
98 INIT_ED_KEY_NEEDCERT|
99 INIT_ED_KEY_INCLUDE_SIGNING_KEY_IN_CERT,
100 LOG_INFO,
101 NULL, 0, 0, CERT_TYPE_ID_SIGNING, &sign_cert, options);
102 tor_free(fname);
103 check_signing_cert = sign_cert;
104 use_signing = sign;
105 }
106
107 if (use_signing) {
108 /* We loaded a signing key with its certificate. */
109 if (! master_signing_key) {
110 /* We didn't know one before! */
111 signing_key_changed = 1;
112 } else if (! ed25519_pubkey_eq(&use_signing->pubkey,
113 &master_signing_key->pubkey) ||
114 ! tor_memeq(use_signing->seckey.seckey,
115 master_signing_key->seckey.seckey,
117 /* We loaded a different signing key than the one we knew before. */
118 signing_key_changed = 1;
119 }
120 }
121
122 if (!use_signing && master_signing_key) {
123 /* We couldn't load a signing key, but we already had one loaded */
124 check_signing_cert = signing_key_cert;
125 use_signing = master_signing_key;
126 }
127
128 const int offline_master =
129 options->OfflineMasterKey && options->command != CMD_KEYGEN;
130 const int need_new_signing_key =
131 NULL == use_signing ||
132 EXPIRES_SOON(check_signing_cert, 0) ||
133 (options->command == CMD_KEYGEN && ! options->change_key_passphrase);
134 const int want_new_signing_key =
135 need_new_signing_key ||
136 EXPIRES_SOON(check_signing_cert, options->TestingSigningKeySlop);
137
138 /* We can only create a master key if we haven't been told that the
139 * master key will always be offline. Also, if we have a signing key,
140 * then we shouldn't make a new master ID key. */
141 const int can_make_master_id_key = !offline_master &&
142 NULL == use_signing;
143
144 if (need_new_signing_key) {
145 log_notice(LD_OR, "It looks like I need to generate and sign a new "
146 "medium-term signing key, because %s. To do that, I "
147 "need to load%s the permanent master identity key. "
148 "If the master identity key was not moved or encrypted "
149 "with a passphrase, this will be done automatically and "
150 "no further action is required. Otherwise, provide the "
151 "necessary data using 'tor --keygen' to do it manually.",
152 (NULL == use_signing) ? "I don't have one" :
153 EXPIRES_SOON(check_signing_cert, 0) ? "the one I have is expired" :
154 "you asked me to make one with --keygen",
155 can_make_master_id_key ? " (or create)" : "");
156 } else if (want_new_signing_key && !offline_master) {
157 log_notice(LD_OR, "It looks like I should try to generate and sign a "
158 "new medium-term signing key, because the one I have is "
159 "going to expire soon. To do that, I'm going to have to "
160 "try to load the permanent master identity key. "
161 "If the master identity key was not moved or encrypted "
162 "with a passphrase, this will be done automatically and "
163 "no further action is required. Otherwise, provide the "
164 "necessary data using 'tor --keygen' to do it manually.");
165 } else if (want_new_signing_key) {
166 log_notice(LD_OR, "It looks like I should try to generate and sign a "
167 "new medium-term signing key, because the one I have is "
168 "going to expire soon. But OfflineMasterKey is set, so I "
169 "won't try to load a permanent master identity key. You "
170 "will need to use 'tor --keygen' to make a new signing "
171 "key and certificate.");
172 }
173
174 {
175 uint32_t flags =
176 (INIT_ED_KEY_SPLIT|
177 INIT_ED_KEY_EXTRA_STRONG|INIT_ED_KEY_NO_REPAIR);
178 if (can_make_master_id_key)
179 flags |= INIT_ED_KEY_CREATE;
180 if (! need_new_signing_key)
181 flags |= INIT_ED_KEY_MISSING_SECRET_OK;
182 if (! want_new_signing_key || offline_master)
183 flags |= INIT_ED_KEY_OMIT_SECRET;
184 if (offline_master)
185 flags |= INIT_ED_KEY_OFFLINE_SECRET;
186 if (options->command == CMD_KEYGEN)
187 flags |= INIT_ED_KEY_TRY_ENCRYPTED;
188
189 /* Check/Create the key directory */
190 if (create_keys_directory(options) < 0)
191 goto err;
192
193 char *fname;
194 if (options->master_key_fname) {
195 fname = tor_strdup(options->master_key_fname);
196 flags |= INIT_ED_KEY_EXPLICIT_FNAME;
197 } else {
198 fname = options_get_keydir_fname(options, "ed25519_master_id");
199 }
201 fname,
202 flags,
203 LOG_WARN, NULL, 0, 0, 0, NULL, options);
204 tor_free(fname);
205 if (!id) {
206 if (need_new_signing_key) {
207 if (offline_master)
208 FAIL("Can't load master identity key; OfflineMasterKey is set.");
209 else
210 FAIL("Missing identity key");
211 } else {
212 log_warn(LD_OR, "Master public key was absent; inferring from "
213 "public key in signing certificate and saving to disk.");
214 tor_assert(check_signing_cert);
215 id = tor_malloc_zero(sizeof(*id));
216 memcpy(&id->pubkey, &check_signing_cert->signing_key,
217 sizeof(ed25519_public_key_t));
218 fname = options_get_keydir_fname(options,
219 "ed25519_master_id_public_key");
220 if (ed25519_pubkey_write_to_file(&id->pubkey, fname, "type0") < 0) {
221 log_warn(LD_OR, "Error while attempting to write master public key "
222 "to disk");
223 tor_free(fname);
224 goto err;
225 }
226 tor_free(fname);
227 }
228 }
229 if (safe_mem_is_zero((char*)id->seckey.seckey, sizeof(id->seckey)))
230 sign_signing_key_with_id = NULL;
231 else
232 sign_signing_key_with_id = id;
233 }
234
235 if (master_identity_key &&
236 !ed25519_pubkey_eq(&id->pubkey, &master_identity_key->pubkey)) {
237 FAIL("Identity key on disk does not match key we loaded earlier!");
238 }
239
240 if (need_new_signing_key && NULL == sign_signing_key_with_id)
241 FAIL("Can't load master key make a new signing key.");
242
243 if (sign_cert) {
244 if (! sign_cert->signing_key_included)
245 FAIL("Loaded a signing cert with no key included!");
246 if (! ed25519_pubkey_eq(&sign_cert->signing_key, &id->pubkey))
247 FAIL("The signing cert we have was not signed with the master key "
248 "we loaded!");
249 if (tor_cert_checksig(sign_cert, &id->pubkey, 0) < 0) {
250 log_warn(LD_OR, "The signing cert we loaded was not signed "
251 "correctly: %s!",
253 goto err;
254 }
255 }
256
257 if (want_new_signing_key && sign_signing_key_with_id) {
258 uint32_t flags = (INIT_ED_KEY_CREATE|
259 INIT_ED_KEY_REPLACE|
260 INIT_ED_KEY_EXTRA_STRONG|
261 INIT_ED_KEY_NEEDCERT|
262 INIT_ED_KEY_INCLUDE_SIGNING_KEY_IN_CERT);
263 char *fname =
264 options_get_keydir_fname(options, "ed25519_signing");
265 ed25519_keypair_free(sign);
266 tor_cert_free(sign_cert);
267 sign = ed_key_init_from_file(fname,
268 flags, LOG_WARN,
269 sign_signing_key_with_id, now,
270 options->SigningKeyLifetime,
271 CERT_TYPE_ID_SIGNING, &sign_cert, options);
272 tor_free(fname);
273 if (!sign)
274 FAIL("Missing signing key");
275 use_signing = sign;
276 signing_key_changed = 1;
277
279 tor_assert(ed25519_pubkey_eq(&sign_cert->signing_key, &id->pubkey));
280 tor_assert(ed25519_pubkey_eq(&sign_cert->signed_key, &sign->pubkey));
281 } else if (want_new_signing_key) {
282 static ratelim_t missing_master = RATELIM_INIT(3600);
283 log_fn_ratelim(&missing_master, LOG_WARN, LD_OR,
284 "Signing key will expire soon, but I can't load the "
285 "master key to sign a new one!");
286 }
287
288 tor_assert(use_signing);
289
290 /* At this point we no longer need our secret identity key. So wipe
291 * it, if we loaded it in the first place. */
292 memwipe(id->seckey.seckey, 0, sizeof(id->seckey));
293
294 if (options->command == CMD_KEYGEN)
295 goto end;
296
297 if (server_mode(options) &&
298 (!rsa_ed_crosscert ||
299 HAPPENS_SOON(rsa_ed_crosscert_expiration, 30*86400))) {
300 uint8_t *crosscert;
301 time_t expiration = now+6*30*86400; /* 6 months in the future. */
302 ssize_t crosscert_len = tor_make_rsa_ed25519_crosscert(&id->pubkey,
303 get_server_identity_key(),
304 expiration,
305 &crosscert);
306 tor_free(rsa_ed_crosscert);
307 rsa_ed_crosscert_len = crosscert_len;
308 rsa_ed_crosscert = crosscert;
309 rsa_ed_crosscert_expiration = expiration;
310 }
311
312 if (!current_auth_key ||
313 signing_key_changed ||
314 EXPIRES_SOON(auth_key_cert, options->TestingAuthKeySlop)) {
315 auth = ed_key_new(use_signing, INIT_ED_KEY_NEEDCERT,
316 now,
317 options->TestingAuthKeyLifetime,
318 CERT_TYPE_SIGNING_AUTH, &auth_cert);
319
320 if (!auth)
321 FAIL("Can't create auth key");
322 }
323
324 /* We've generated or loaded everything. Put them in memory. */
325
326 end:
327 if (! master_identity_key) {
328 SET_KEY(master_identity_key, id);
329 } else {
330 tor_free(id);
331 }
332 if (sign) {
333 SET_KEY(master_signing_key, sign);
334 SET_CERT(signing_key_cert, sign_cert);
335 }
336 if (auth) {
337 SET_KEY(current_auth_key, auth);
338 SET_CERT(auth_key_cert, auth_cert);
339 }
340
341 return signing_key_changed;
342 err:
343 ed25519_keypair_free(id);
344 ed25519_keypair_free(sign);
345 ed25519_keypair_free(auth);
346 tor_cert_free(sign_cert);
347 tor_cert_free(auth_cert);
348 return -1;
349}
350
351/**
352 * Retrieve our currently-in-use Ed25519 link certificate and id certificate,
353 * and, if they would expire soon (based on the time <b>now</b>, generate new
354 * certificates (without embedding the public part of the signing key inside).
355 * If <b>force</b> is true, always generate a new certificate.
356 *
357 * The signed_key from the current id->signing certificate will be used to
358 * sign the new key within newly generated X509 certificate.
359 *
360 * Returns -1 upon error. Otherwise, returns 0 upon success (either when the
361 * current certificate is still valid, or when a new certificate was
362 * successfully generated, or no certificate was needed).
363 */
364int
365generate_ed_link_cert(const or_options_t *options, time_t now,
366 int force)
367{
368 const tor_x509_cert_t *link_ = NULL, *id = NULL;
369 tor_cert_t *link_cert = NULL;
370
371 if (tor_tls_get_my_certs(1, &link_, &id) < 0 || link_ == NULL) {
372 if (!server_mode(options)) {
373 /* No need to make an Ed25519->Link cert: we are a client */
374 return 0;
375 }
376 log_warn(LD_OR, "Can't get my x509 link cert.");
377 return -1;
378 }
379
380 const common_digests_t *digests = tor_x509_cert_get_cert_digests(link_);
381
382 if (force == 0 &&
383 link_cert_cert &&
384 ! EXPIRES_SOON(link_cert_cert, options->TestingLinkKeySlop) &&
385 fast_memeq(digests->d[DIGEST_SHA256], link_cert_cert->signed_key.pubkey,
386 DIGEST256_LEN)) {
387 return 0;
388 }
389
390 link_cert = tor_cert_create_raw(get_master_signing_keypair(),
391 CERT_TYPE_SIGNING_LINK,
392 SIGNED_KEY_TYPE_SHA256_OF_X509,
393 (const uint8_t*)digests->d[DIGEST_SHA256],
394 now,
395 options->TestingLinkCertLifetime, 0);
396
397 if (link_cert) {
398 SET_CERT(link_cert_cert, link_cert);
399 }
400 return 0;
401}
402
403#undef FAIL
404#undef SET_KEY
405#undef SET_CERT
406
407/**
408 * Return 1 if any of the following are true:
409 *
410 * - if one of our Ed25519 signing, auth, or link certificates would expire
411 * soon w.r.t. the time <b>now</b>,
412 * - if we do not currently have a link certificate, or
413 * - if our cached Ed25519 link certificate is not same as the one we're
414 * currently using.
415 *
416 * Otherwise, returns 0.
417 */
418int
419should_make_new_ed_keys(const or_options_t *options, const time_t now)
420{
421 if (!master_identity_key ||
422 !master_signing_key ||
423 !current_auth_key ||
424 !link_cert_cert ||
425 EXPIRES_SOON(signing_key_cert, options->TestingSigningKeySlop) ||
426 EXPIRES_SOON(auth_key_cert, options->TestingAuthKeySlop) ||
427 EXPIRES_SOON(link_cert_cert, options->TestingLinkKeySlop))
428 return 1;
429
430 const tor_x509_cert_t *link_ = NULL, *id = NULL;
431
432 if (tor_tls_get_my_certs(1, &link_, &id) < 0 || link_ == NULL)
433 return 1;
434
435 const common_digests_t *digests = tor_x509_cert_get_cert_digests(link_);
436
437 if (!fast_memeq(digests->d[DIGEST_SHA256],
438 link_cert_cert->signed_key.pubkey,
439 DIGEST256_LEN)) {
440 return 1;
441 }
442
443 return 0;
444}
445
446#undef EXPIRES_SOON
447#undef HAPPENS_SOON
448
449#ifdef TOR_UNIT_TESTS
450/* Helper for unit tests: populate the ed25519 keys without saving or
451 * loading */
452void
453init_mock_ed_keys(const crypto_pk_t *rsa_identity_key)
454{
455 routerkeys_free_all();
456
457#define MAKEKEY(k) \
458 k = tor_malloc_zero(sizeof(*k)); \
459 if (ed25519_keypair_generate(k, 0) < 0) { \
460 log_warn(LD_BUG, "Couldn't make a keypair"); \
461 goto err; \
462 }
463 MAKEKEY(master_identity_key);
464 MAKEKEY(master_signing_key);
465 MAKEKEY(current_auth_key);
466#define MAKECERT(cert, signing, signed_, type, flags) \
467 cert = tor_cert_create_ed25519(signing, \
468 type, \
469 &signed_->pubkey, \
470 time(NULL), 86400, \
471 flags); \
472 if (!cert) { \
473 log_warn(LD_BUG, "Couldn't make a %s certificate!", #cert); \
474 goto err; \
475 }
476
477 MAKECERT(signing_key_cert,
478 master_identity_key, master_signing_key, CERT_TYPE_ID_SIGNING,
479 CERT_FLAG_INCLUDE_SIGNING_KEY);
480 MAKECERT(auth_key_cert,
481 master_signing_key, current_auth_key, CERT_TYPE_SIGNING_AUTH, 0);
482
483 if (generate_ed_link_cert(get_options(), time(NULL), 0) < 0) {
484 log_warn(LD_BUG, "Couldn't make link certificate");
485 goto err;
486 }
487
488 rsa_ed_crosscert_len = tor_make_rsa_ed25519_crosscert(
489 &master_identity_key->pubkey,
490 rsa_identity_key,
491 time(NULL)+86400,
492 &rsa_ed_crosscert);
493
494 return;
495
496 err:
497 routerkeys_free_all();
499}
500#undef MAKEKEY
501#undef MAKECERT
502#endif /* defined(TOR_UNIT_TESTS) */
503
504/**
505 * Print the ISO8601-formated <b>expiration</b> for a certificate with
506 * some <b>description</b> to stdout.
507 *
508 * For example, for a signing certificate, this might print out:
509 * signing-cert-expiry: 2017-07-25 08:30:15 UTC
510 */
511static void
512print_cert_expiration(const char *expiration,
513 const char *description)
514{
515 fprintf(stderr, "%s-cert-expiry: %s\n", description, expiration);
516}
517
518/**
519 * Log when a certificate, <b>cert</b>, with some <b>description</b> and
520 * stored in a file named <b>fname</b>, is going to expire. Formats the expire
521 * time according to <b>time_format</b>.
522 */
523static void
525 const char *description,
526 const char *fname,
527 key_expiration_format_t time_format) {
528 if (BUG(!cert)) { /* If the specified key hasn't been loaded */
529 log_warn(LD_OR, "No %s key loaded; can't get certificate expiration.",
530 description);
531 } else {
532 char expiration[ISO_TIME_LEN+1];
533 switch (time_format) {
534 case KEY_EXPIRATION_FORMAT_ISO8601:
535 format_local_iso_time(expiration, cert->valid_until);
536 break;
537
538 case KEY_EXPIRATION_FORMAT_TIMESTAMP:
539 tor_snprintf(expiration, sizeof(expiration), "%"PRId64,
540 (int64_t) cert->valid_until);
541 break;
542
543 default:
544 log_err(LD_BUG, "Unknown time format value: %d.", time_format);
545 return;
546 }
547 log_notice(LD_OR, "The %s certificate stored in %s is valid until %s.",
548 description, fname, expiration);
549 print_cert_expiration(expiration, description);
550 }
551}
552
553/**
554 * Log when our master signing key certificate expires. Used when tor is given
555 * the --key-expiration command-line option.
556 *
557 * Returns 0 on success and 1 on failure.
558 */
559static int
561{
562 const tor_cert_t *signing_key;
563 char *fn = NULL;
564 int failed = 0;
565 time_t now = approx_time();
566
567 fn = options_get_keydir_fname(options, "ed25519_signing_cert");
568
569 /* Try to grab our cached copy of the key. */
570 signing_key = get_master_signing_key_cert();
571
573
574 /* Load our keys from disk, if necessary. */
575 if (!signing_key) {
576 failed = load_ed_keys(options, now) < 0;
577 signing_key = get_master_signing_key_cert();
578 }
579
580 /* If we do have a signing key, log the expiration time. */
581 if (signing_key) {
582 key_expiration_format_t time_format = options->key_expiration_format;
583 log_ed_cert_expiration(signing_key, "signing", fn, time_format);
584 } else {
585 log_warn(LD_OR, "Could not load signing key certificate from %s, so " \
586 "we couldn't learn anything about certificate expiration.", fn);
587 }
588
589 tor_free(fn);
590
591 return failed;
592}
593
594/**
595 * Log when a key certificate expires. Used when tor is given the
596 * --key-expiration command-line option.
597 *
598 * If an command argument is given, which should specify the type of
599 * key to get expiry information about (currently supported arguments
600 * are "sign"), get info about that type of certificate. Otherwise,
601 * print info about the supported arguments.
602 *
603 * Returns 0 on success and -1 on failure.
604 */
605int
607{
608 const or_options_t *options = get_options();
609 const char *arg = options->command_arg;
610
611 if (!strcmp(arg, "sign")) {
613 } else {
614 fprintf(stderr, "No valid argument to --key-expiration found!\n");
615 fprintf(stderr, "Currently recognised arguments are: 'sign'\n");
616
617 return -1;
618 }
619}
620
622get_master_identity_key(void)
623{
624 if (!master_identity_key)
625 return NULL;
626 return &master_identity_key->pubkey;
627}
628
629/** Return true iff <b>id</b> is our Ed25519 master identity key. */
630int
632{
633 return id && master_identity_key &&
634 ed25519_pubkey_eq(id, &master_identity_key->pubkey);
635}
636
637#ifdef TOR_UNIT_TESTS
638/* only exists for the unit tests, since otherwise the identity key
639 * should be used to sign nothing but the signing key. */
640const ed25519_keypair_t *
641get_master_identity_keypair(void)
642{
643 return master_identity_key;
644}
645#endif /* defined(TOR_UNIT_TESTS) */
646
648get_master_signing_keypair,(void))
649{
650 return master_signing_key;
651}
652
653MOCK_IMPL(const struct tor_cert_st *,
654get_master_signing_key_cert,(void))
655{
656 return signing_key_cert;
657}
658
659const ed25519_keypair_t *
660get_current_auth_keypair(void)
661{
662 return current_auth_key;
663}
664
665const tor_cert_t *
666get_current_link_cert_cert(void)
667{
668 return link_cert_cert;
669}
670
671const tor_cert_t *
672get_current_auth_key_cert(void)
673{
674 return auth_key_cert;
675}
676
677void
678get_master_rsa_crosscert(const uint8_t **cert_out,
679 size_t *size_out)
680{
681 *cert_out = rsa_ed_crosscert;
682 *size_out = rsa_ed_crosscert_len;
683}
684
685/** Construct cross-certification for the master identity key with
686 * the ntor onion key. Store the sign of the corresponding ed25519 public key
687 * in *<b>sign_out</b>. */
690 const ed25519_public_key_t *master_id_key, time_t now, time_t lifetime,
691 int *sign_out)
692{
693 tor_cert_t *cert = NULL;
694 ed25519_keypair_t ed_onion_key;
695
696 if (ed25519_keypair_from_curve25519_keypair(&ed_onion_key, sign_out,
697 onion_key) < 0)
698 goto end;
699
700 cert = tor_cert_create_ed25519(&ed_onion_key, CERT_TYPE_ONION_ID,
701 master_id_key, now, lifetime, 0);
702
703 end:
704 memwipe(&ed_onion_key, 0, sizeof(ed_onion_key));
705 return cert;
706}
707
708/** Construct and return an RSA signature for the TAP onion key to
709 * cross-certify the RSA and Ed25519 identity keys. Set <b>len_out</b> to its
710 * length. */
711uint8_t *
713 const ed25519_public_key_t *master_id_key,
714 const crypto_pk_t *rsa_id_key,
715 int *len_out)
716{
717 uint8_t signature[PK_BYTES];
718 uint8_t signed_data[DIGEST_LEN + ED25519_PUBKEY_LEN];
719
720 *len_out = 0;
721 if (crypto_pk_get_digest(rsa_id_key, (char*)signed_data) < 0) {
722 log_info(LD_OR, "crypto_pk_get_digest failed in "
723 "make_tap_onion_key_crosscert!");
724 return NULL;
725 }
726 memcpy(signed_data + DIGEST_LEN, master_id_key->pubkey, ED25519_PUBKEY_LEN);
727
728 int r = crypto_pk_private_sign(onion_key,
729 (char*)signature, sizeof(signature),
730 (const char*)signed_data, sizeof(signed_data));
731 if (r < 0) {
732 /* It's probably missing the private key */
733 log_info(LD_OR, "crypto_pk_private_sign failed in "
734 "make_tap_onion_key_crosscert!");
735 return NULL;
736 }
737
738 *len_out = r;
739
740 return tor_memdup(signature, r);
741}
742
743void
744routerkeys_free_all(void)
745{
746 ed25519_keypair_free(master_identity_key);
747 ed25519_keypair_free(master_signing_key);
748 ed25519_keypair_free(current_auth_key);
749 tor_cert_free(signing_key_cert);
750 tor_cert_free(link_cert_cert);
751 tor_cert_free(auth_key_cert);
752 tor_free(rsa_ed_crosscert);
753
754 master_identity_key = master_signing_key = NULL;
755 current_auth_key = NULL;
756 signing_key_cert = link_cert_cert = auth_key_cert = NULL;
757 rsa_ed_crosscert = NULL; // redundant
758 rsa_ed_crosscert_len = 0;
759}
time_t approx_time(void)
Definition: approx_time.c:32
int create_keys_directory(const or_options_t *options)
Definition: config.c:1401
const or_options_t * get_options(void)
Definition: config.c:944
Header file for config.c.
#define options_get_keydir_fname(options, sub1)
Definition: config.h:130
int ed25519_pubkey_write_to_file(const ed25519_public_key_t *pubkey, const char *filename, const char *tag)
int ed25519_keypair_from_curve25519_keypair(ed25519_keypair_t *out, int *signbit_out, const curve25519_keypair_t *inp)
int ed25519_pubkey_eq(const ed25519_public_key_t *key1, const ed25519_public_key_t *key2)
int crypto_pk_get_digest(const crypto_pk_t *pk, char *digest_out)
Definition: crypto_rsa.c:356
#define PK_BYTES
Definition: crypto_rsa.h:24
int crypto_pk_private_sign(const crypto_pk_t *env, char *to, size_t tolen, const char *from, size_t fromlen)
void memwipe(void *mem, uint8_t byte, size_t sz)
Definition: crypto_util.c:55
Common functions for cryptographic routines.
int tor_memeq(const void *a, const void *b, size_t sz)
Definition: di_ops.c:107
int safe_mem_is_zero(const void *mem, size_t sz)
Definition: di_ops.c:224
#define fast_memeq(a, b, c)
Definition: di_ops.h:35
#define DIGEST_LEN
Definition: digest_sizes.h:20
#define DIGEST256_LEN
Definition: digest_sizes.h:23
ed25519_keypair_t * ed_key_new(const ed25519_keypair_t *signing_key, uint32_t flags, time_t now, time_t lifetime, uint8_t cert_type, struct tor_cert_st **cert_out)
Definition: loadkey.c:719
ed25519_keypair_t * ed_key_init_from_file(const char *fname, uint32_t flags, int severity, const ed25519_keypair_t *signing_key, time_t now, time_t lifetime, uint8_t cert_type, struct tor_cert_st **cert_out, const or_options_t *options)
Definition: loadkey.c:379
Header file for loadkey.c.
#define log_fn_ratelim(ratelim, severity, domain, args,...)
Definition: log.h:288
#define LD_OR
Definition: log.h:92
#define LD_BUG
Definition: log.h:86
#define LOG_WARN
Definition: log.h:53
#define LOG_INFO
Definition: log.h:45
#define tor_free(p)
Definition: malloc.h:56
Master header file for Tor-specific functionality.
key_expiration_format_t
Definition: or_options_st.h:58
int tor_snprintf(char *str, size_t size, const char *format,...)
Definition: printf.c:27
int server_identity_key_is_set(void)
Definition: router.c:412
Header file for router.c.
int load_ed_keys(const or_options_t *options, time_t now)
Definition: routerkeys.c:55
int should_make_new_ed_keys(const or_options_t *options, const time_t now)
Definition: routerkeys.c:419
int router_ed25519_id_is_me(const ed25519_public_key_t *id)
Definition: routerkeys.c:631
static int log_master_signing_key_cert_expiration(const or_options_t *options)
Definition: routerkeys.c:560
uint8_t * make_tap_onion_key_crosscert(const crypto_pk_t *onion_key, const ed25519_public_key_t *master_id_key, const crypto_pk_t *rsa_id_key, int *len_out)
Definition: routerkeys.c:712
static void log_ed_cert_expiration(const tor_cert_t *cert, const char *description, const char *fname, key_expiration_format_t time_format)
Definition: routerkeys.c:524
static void print_cert_expiration(const char *expiration, const char *description)
Definition: routerkeys.c:512
tor_cert_t * make_ntor_onion_key_crosscert(const curve25519_keypair_t *onion_key, const ed25519_public_key_t *master_id_key, time_t now, time_t lifetime, int *sign_out)
Definition: routerkeys.c:689
int log_cert_expiration(void)
Definition: routerkeys.c:606
int generate_ed_link_cert(const or_options_t *options, time_t now, int force)
Definition: routerkeys.c:365
Header for routerkeys.c.
int server_mode(const or_options_t *options)
Definition: routermode.c:34
Header file for routermode.c.
char d[N_COMMON_DIGEST_ALGORITHMS][DIGEST256_LEN]
Definition: crypto_digest.h:89
uint8_t seckey[ED25519_SECKEY_LEN]
int TestingLinkKeySlop
char * command_arg
Definition: or_options_st.h:69
int TestingAuthKeyLifetime
int TestingLinkCertLifetime
int SigningKeyLifetime
int TestingSigningKeySlop
tor_cmdline_mode_t command
Definition: or_options_st.h:68
int TestingAuthKeySlop
ed25519_public_key_t signing_key
Definition: torcert.h:35
time_t valid_until
Definition: torcert.h:37
ed25519_public_key_t signed_key
Definition: torcert.h:32
unsigned signing_key_included
Definition: torcert.h:47
#define MOCK_IMPL(rv, funcname, arglist)
Definition: testsupport.h:133
void format_local_iso_time(char *buf, time_t t)
Definition: time_fmt.c:316
@ CMD_KEYGEN
ssize_t tor_make_rsa_ed25519_crosscert(const ed25519_public_key_t *ed_key, const crypto_pk_t *rsa_key, time_t expires, uint8_t **cert)
Definition: torcert.c:331
int tor_cert_checksig(tor_cert_t *cert, const ed25519_public_key_t *pubkey, time_t now)
Definition: torcert.c:244
tor_cert_t * tor_cert_create_ed25519(const ed25519_keypair_t *signing_key, uint8_t cert_type, const ed25519_public_key_t *signed_key, time_t now, time_t lifetime, uint32_t flags)
Definition: torcert.c:131
const char * tor_cert_describe_signature_status(const tor_cert_t *cert)
Definition: torcert.c:279
tor_cert_t * tor_cert_create_raw(const ed25519_keypair_t *signing_key, uint8_t cert_type, uint8_t signed_key_type, const uint8_t signed_key_info[32], time_t now, time_t lifetime, uint32_t flags)
Definition: torcert.c:44
Header for torcert.c.
int tor_tls_get_my_certs(int server, const tor_x509_cert_t **link_cert_out, const tor_x509_cert_t **id_cert_out)
Definition: tortls.c:76
Headers for tortls.c.
#define tor_assert_nonfatal_unreached()
Definition: util_bug.h:177
#define tor_assert(expr)
Definition: util_bug.h:103
#define ED25519_SECKEY_LEN
Definition: x25519_sizes.h:29
#define ED25519_PUBKEY_LEN
Definition: x25519_sizes.h:27
Headers for tortls.c.
const common_digests_t * tor_x509_cert_get_cert_digests(const tor_x509_cert_t *cert)
Definition: x509.c:69