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mld6query(8): Rename mld6.c -> mld6query.c
[dragonfly.git] / crypto / openssh / krl.c
blob086fc20e59336ccfe1a7eccf4b550250b2fa2532
1 /*
2 * Copyright (c) 2012 Damien Miller <djm@mindrot.org>
3 *
4 * Permission to use, copy, modify, and distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
7 *
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15 */
16
17 /* $OpenBSD: krl.c,v 1.40 2017/05/31 09:15:42 deraadt Exp $ */
18
19 #include "includes.h"
20
21 #include <sys/types.h>
22 #include <openbsd-compat/sys-tree.h>
23 #include <openbsd-compat/sys-queue.h>
24
25 #include <errno.h>
26 #include <fcntl.h>
27 #include <limits.h>
28 #include <string.h>
29 #include <time.h>
30 #include <unistd.h>
31
32 #include "sshbuf.h"
33 #include "ssherr.h"
34 #include "sshkey.h"
35 #include "authfile.h"
36 #include "misc.h"
37 #include "log.h"
38 #include "digest.h"
39 #include "bitmap.h"
40
41 #include "krl.h"
42
43 /* #define DEBUG_KRL */
44 #ifdef DEBUG_KRL
45 # define KRL_DBG(x) debug3 x
46 #else
47 # define KRL_DBG(x)
48 #endif
49
50 /*
51 * Trees of revoked serial numbers, key IDs and keys. This allows
52 * quick searching, querying and producing lists in canonical order.
53 */
54
55 /* Tree of serial numbers. XXX make smarter: really need a real sparse bitmap */
56 struct revoked_serial {
57 u_int64_t lo, hi;
58 RB_ENTRY(revoked_serial) tree_entry;
59 };
60 static int serial_cmp(struct revoked_serial *a, struct revoked_serial *b);
61 RB_HEAD(revoked_serial_tree, revoked_serial);
62 RB_GENERATE_STATIC(revoked_serial_tree, revoked_serial, tree_entry, serial_cmp);
63
64 /* Tree of key IDs */
65 struct revoked_key_id {
66 char *key_id;
67 RB_ENTRY(revoked_key_id) tree_entry;
68 };
69 static int key_id_cmp(struct revoked_key_id *a, struct revoked_key_id *b);
70 RB_HEAD(revoked_key_id_tree, revoked_key_id);
71 RB_GENERATE_STATIC(revoked_key_id_tree, revoked_key_id, tree_entry, key_id_cmp);
72
73 /* Tree of blobs (used for keys and fingerprints) */
74 struct revoked_blob {
75 u_char *blob;
76 size_t len;
77 RB_ENTRY(revoked_blob) tree_entry;
78 };
79 static int blob_cmp(struct revoked_blob *a, struct revoked_blob *b);
80 RB_HEAD(revoked_blob_tree, revoked_blob);
81 RB_GENERATE_STATIC(revoked_blob_tree, revoked_blob, tree_entry, blob_cmp);
82
83 /* Tracks revoked certs for a single CA */
84 struct revoked_certs {
85 struct sshkey *ca_key;
86 struct revoked_serial_tree revoked_serials;
87 struct revoked_key_id_tree revoked_key_ids;
88 TAILQ_ENTRY(revoked_certs) entry;
89 };
90 TAILQ_HEAD(revoked_certs_list, revoked_certs);
91
92 struct ssh_krl {
93 u_int64_t krl_version;
94 u_int64_t generated_date;
95 u_int64_t flags;
96 char *comment;
97 struct revoked_blob_tree revoked_keys;
98 struct revoked_blob_tree revoked_sha1s;
99 struct revoked_certs_list revoked_certs;
100 };
101
102 /* Return equal if a and b overlap */
103 static int
104 serial_cmp(struct revoked_serial *a, struct revoked_serial *b)
105 {
106 if (a->hi >= b->lo && a->lo <= b->hi)
107 return 0;
108 return a->lo < b->lo ? -1 : 1;
109 }
110
111 static int
112 key_id_cmp(struct revoked_key_id *a, struct revoked_key_id *b)
113 {
114 return strcmp(a->key_id, b->key_id);
115 }
116
117 static int
118 blob_cmp(struct revoked_blob *a, struct revoked_blob *b)
119 {
120 int r;
121
122 if (a->len != b->len) {
123 if ((r = memcmp(a->blob, b->blob, MINIMUM(a->len, b->len))) != 0)
124 return r;
125 return a->len > b->len ? 1 : -1;
126 } else
127 return memcmp(a->blob, b->blob, a->len);
128 }
129
130 struct ssh_krl *
131 ssh_krl_init(void)
132 {
133 struct ssh_krl *krl;
134
135 if ((krl = calloc(1, sizeof(*krl))) == NULL)
136 return NULL;
137 RB_INIT(&krl->revoked_keys);
138 RB_INIT(&krl->revoked_sha1s);
139 TAILQ_INIT(&krl->revoked_certs);
140 return krl;
141 }
142
143 static void
144 revoked_certs_free(struct revoked_certs *rc)
145 {
146 struct revoked_serial *rs, *trs;
147 struct revoked_key_id *rki, *trki;
148
149 RB_FOREACH_SAFE(rs, revoked_serial_tree, &rc->revoked_serials, trs) {
150 RB_REMOVE(revoked_serial_tree, &rc->revoked_serials, rs);
151 free(rs);
152 }
153 RB_FOREACH_SAFE(rki, revoked_key_id_tree, &rc->revoked_key_ids, trki) {
154 RB_REMOVE(revoked_key_id_tree, &rc->revoked_key_ids, rki);
155 free(rki->key_id);
156 free(rki);
157 }
158 sshkey_free(rc->ca_key);
159 }
160
161 void
162 ssh_krl_free(struct ssh_krl *krl)
163 {
164 struct revoked_blob *rb, *trb;
165 struct revoked_certs *rc, *trc;
166
167 if (krl == NULL)
168 return;
169
170 free(krl->comment);
171 RB_FOREACH_SAFE(rb, revoked_blob_tree, &krl->revoked_keys, trb) {
172 RB_REMOVE(revoked_blob_tree, &krl->revoked_keys, rb);
173 free(rb->blob);
174 free(rb);
175 }
176 RB_FOREACH_SAFE(rb, revoked_blob_tree, &krl->revoked_sha1s, trb) {
177 RB_REMOVE(revoked_blob_tree, &krl->revoked_sha1s, rb);
178 free(rb->blob);
179 free(rb);
180 }
181 TAILQ_FOREACH_SAFE(rc, &krl->revoked_certs, entry, trc) {
182 TAILQ_REMOVE(&krl->revoked_certs, rc, entry);
183 revoked_certs_free(rc);
184 }
185 }
186
187 void
188 ssh_krl_set_version(struct ssh_krl *krl, u_int64_t version)
189 {
190 krl->krl_version = version;
191 }
192
193 int
194 ssh_krl_set_comment(struct ssh_krl *krl, const char *comment)
195 {
196 free(krl->comment);
197 if ((krl->comment = strdup(comment)) == NULL)
198 return SSH_ERR_ALLOC_FAIL;
199 return 0;
200 }
201
202 /*
203 * Find the revoked_certs struct for a CA key. If allow_create is set then
204 * create a new one in the tree if one did not exist already.
205 */
206 static int
207 revoked_certs_for_ca_key(struct ssh_krl *krl, const struct sshkey *ca_key,
208 struct revoked_certs **rcp, int allow_create)
209 {
210 struct revoked_certs *rc;
211 int r;
212
213 *rcp = NULL;
214 TAILQ_FOREACH(rc, &krl->revoked_certs, entry) {
215 if ((ca_key == NULL && rc->ca_key == NULL) ||
216 sshkey_equal(rc->ca_key, ca_key)) {
217 *rcp = rc;
218 return 0;
219 }
220 }
221 if (!allow_create)
222 return 0;
223 /* If this CA doesn't exist in the list then add it now */
224 if ((rc = calloc(1, sizeof(*rc))) == NULL)
225 return SSH_ERR_ALLOC_FAIL;
226 if (ca_key == NULL)
227 rc->ca_key = NULL;
228 else if ((r = sshkey_from_private(ca_key, &rc->ca_key)) != 0) {
229 free(rc);
230 return r;
231 }
232 RB_INIT(&rc->revoked_serials);
233 RB_INIT(&rc->revoked_key_ids);
234 TAILQ_INSERT_TAIL(&krl->revoked_certs, rc, entry);
235 KRL_DBG(("%s: new CA %s", __func__,
236 ca_key == NULL ? "*" : sshkey_type(ca_key)));
237 *rcp = rc;
238 return 0;
239 }
240
241 static int
242 insert_serial_range(struct revoked_serial_tree *rt, u_int64_t lo, u_int64_t hi)
243 {
244 struct revoked_serial rs, *ers, *crs, *irs;
245
246 KRL_DBG(("%s: insert %llu:%llu", __func__, lo, hi));
247 memset(&rs, 0, sizeof(rs));
248 rs.lo = lo;
249 rs.hi = hi;
250 ers = RB_NFIND(revoked_serial_tree, rt, &rs);
251 if (ers == NULL || serial_cmp(ers, &rs) != 0) {
252 /* No entry matches. Just insert */
253 if ((irs = malloc(sizeof(rs))) == NULL)
254 return SSH_ERR_ALLOC_FAIL;
255 memcpy(irs, &rs, sizeof(*irs));
256 ers = RB_INSERT(revoked_serial_tree, rt, irs);
257 if (ers != NULL) {
258 KRL_DBG(("%s: bad: ers != NULL", __func__));
259 /* Shouldn't happen */
260 free(irs);
261 return SSH_ERR_INTERNAL_ERROR;
262 }
263 ers = irs;
264 } else {
265 KRL_DBG(("%s: overlap found %llu:%llu", __func__,
266 ers->lo, ers->hi));
267 /*
268 * The inserted entry overlaps an existing one. Grow the
269 * existing entry.
270 */
271 if (ers->lo > lo)
272 ers->lo = lo;
273 if (ers->hi < hi)
274 ers->hi = hi;
275 }
276
277 /*
278 * The inserted or revised range might overlap or abut adjacent ones;
279 * coalesce as necessary.
280 */
281
282 /* Check predecessors */
283 while ((crs = RB_PREV(revoked_serial_tree, rt, ers)) != NULL) {
284 KRL_DBG(("%s: pred %llu:%llu", __func__, crs->lo, crs->hi));
285 if (ers->lo != 0 && crs->hi < ers->lo - 1)
286 break;
287 /* This entry overlaps. */
288 if (crs->lo < ers->lo) {
289 ers->lo = crs->lo;
290 KRL_DBG(("%s: pred extend %llu:%llu", __func__,
291 ers->lo, ers->hi));
292 }
293 RB_REMOVE(revoked_serial_tree, rt, crs);
294 free(crs);
295 }
296 /* Check successors */
297 while ((crs = RB_NEXT(revoked_serial_tree, rt, ers)) != NULL) {
298 KRL_DBG(("%s: succ %llu:%llu", __func__, crs->lo, crs->hi));
299 if (ers->hi != (u_int64_t)-1 && crs->lo > ers->hi + 1)
300 break;
301 /* This entry overlaps. */
302 if (crs->hi > ers->hi) {
303 ers->hi = crs->hi;
304 KRL_DBG(("%s: succ extend %llu:%llu", __func__,
305 ers->lo, ers->hi));
306 }
307 RB_REMOVE(revoked_serial_tree, rt, crs);
308 free(crs);
309 }
310 KRL_DBG(("%s: done, final %llu:%llu", __func__, ers->lo, ers->hi));
311 return 0;
312 }
313
314 int
315 ssh_krl_revoke_cert_by_serial(struct ssh_krl *krl, const struct sshkey *ca_key,
316 u_int64_t serial)
317 {
318 return ssh_krl_revoke_cert_by_serial_range(krl, ca_key, serial, serial);
319 }
320
321 int
322 ssh_krl_revoke_cert_by_serial_range(struct ssh_krl *krl,
323 const struct sshkey *ca_key, u_int64_t lo, u_int64_t hi)
324 {
325 struct revoked_certs *rc;
326 int r;
327
328 if (lo > hi || lo == 0)
329 return SSH_ERR_INVALID_ARGUMENT;
330 if ((r = revoked_certs_for_ca_key(krl, ca_key, &rc, 1)) != 0)
331 return r;
332 return insert_serial_range(&rc->revoked_serials, lo, hi);
333 }
334
335 int
336 ssh_krl_revoke_cert_by_key_id(struct ssh_krl *krl, const struct sshkey *ca_key,
337 const char *key_id)
338 {
339 struct revoked_key_id *rki, *erki;
340 struct revoked_certs *rc;
341 int r;
342
343 if ((r = revoked_certs_for_ca_key(krl, ca_key, &rc, 1)) != 0)
344 return r;
345
346 KRL_DBG(("%s: revoke %s", __func__, key_id));
347 if ((rki = calloc(1, sizeof(*rki))) == NULL ||
348 (rki->key_id = strdup(key_id)) == NULL) {
349 free(rki);
350 return SSH_ERR_ALLOC_FAIL;
351 }
352 erki = RB_INSERT(revoked_key_id_tree, &rc->revoked_key_ids, rki);
353 if (erki != NULL) {
354 free(rki->key_id);
355 free(rki);
356 }
357 return 0;
358 }
359
360 /* Convert "key" to a public key blob without any certificate information */
361 static int
362 plain_key_blob(const struct sshkey *key, u_char **blob, size_t *blen)
363 {
364 struct sshkey *kcopy;
365 int r;
366
367 if ((r = sshkey_from_private(key, &kcopy)) != 0)
368 return r;
369 if (sshkey_is_cert(kcopy)) {
370 if ((r = sshkey_drop_cert(kcopy)) != 0) {
371 sshkey_free(kcopy);
372 return r;
373 }
374 }
375 r = sshkey_to_blob(kcopy, blob, blen);
376 sshkey_free(kcopy);
377 return r;
378 }
379
380 /* Revoke a key blob. Ownership of blob is transferred to the tree */
381 static int
382 revoke_blob(struct revoked_blob_tree *rbt, u_char *blob, size_t len)
383 {
384 struct revoked_blob *rb, *erb;
385
386 if ((rb = calloc(1, sizeof(*rb))) == NULL)
387 return SSH_ERR_ALLOC_FAIL;
388 rb->blob = blob;
389 rb->len = len;
390 erb = RB_INSERT(revoked_blob_tree, rbt, rb);
391 if (erb != NULL) {
392 free(rb->blob);
393 free(rb);
394 }
395 return 0;
396 }
397
398 int
399 ssh_krl_revoke_key_explicit(struct ssh_krl *krl, const struct sshkey *key)
400 {
401 u_char *blob;
402 size_t len;
403 int r;
404
405 debug3("%s: revoke type %s", __func__, sshkey_type(key));
406 if ((r = plain_key_blob(key, &blob, &len)) != 0)
407 return r;
408 return revoke_blob(&krl->revoked_keys, blob, len);
409 }
410
411 int
412 ssh_krl_revoke_key_sha1(struct ssh_krl *krl, const struct sshkey *key)
413 {
414 u_char *blob;
415 size_t len;
416 int r;
417
418 debug3("%s: revoke type %s by sha1", __func__, sshkey_type(key));
419 if ((r = sshkey_fingerprint_raw(key, SSH_DIGEST_SHA1,
420 &blob, &len)) != 0)
421 return r;
422 return revoke_blob(&krl->revoked_sha1s, blob, len);
423 }
424
425 int
426 ssh_krl_revoke_key(struct ssh_krl *krl, const struct sshkey *key)
427 {
428 if (!sshkey_is_cert(key))
429 return ssh_krl_revoke_key_sha1(krl, key);
430
431 if (key->cert->serial == 0) {
432 return ssh_krl_revoke_cert_by_key_id(krl,
433 key->cert->signature_key,
434 key->cert->key_id);
435 } else {
436 return ssh_krl_revoke_cert_by_serial(krl,
437 key->cert->signature_key,
438 key->cert->serial);
439 }
440 }
441
442 /*
443 * Select the most compact section type to emit next in a KRL based on
444 * the current section type, the run length of contiguous revoked serial
445 * numbers and the gaps from the last and to the next revoked serial.
446 * Applies a mostly-accurate bit cost model to select the section type
447 * that will minimise the size of the resultant KRL.
448 */
449 static int
450 choose_next_state(int current_state, u_int64_t contig, int final,
451 u_int64_t last_gap, u_int64_t next_gap, int *force_new_section)
452 {
453 int new_state;
454 u_int64_t cost, cost_list, cost_range, cost_bitmap, cost_bitmap_restart;
455
456 /*
457 * Avoid unsigned overflows.
458 * The limits are high enough to avoid confusing the calculations.
459 */
460 contig = MINIMUM(contig, 1ULL<<31);
461 last_gap = MINIMUM(last_gap, 1ULL<<31);
462 next_gap = MINIMUM(next_gap, 1ULL<<31);
463
464 /*
465 * Calculate the cost to switch from the current state to candidates.
466 * NB. range sections only ever contain a single range, so their
467 * switching cost is independent of the current_state.
468 */
469 cost_list = cost_bitmap = cost_bitmap_restart = 0;
470 cost_range = 8;
471 switch (current_state) {
472 case KRL_SECTION_CERT_SERIAL_LIST:
473 cost_bitmap_restart = cost_bitmap = 8 + 64;
474 break;
475 case KRL_SECTION_CERT_SERIAL_BITMAP:
476 cost_list = 8;
477 cost_bitmap_restart = 8 + 64;
478 break;
479 case KRL_SECTION_CERT_SERIAL_RANGE:
480 case 0:
481 cost_bitmap_restart = cost_bitmap = 8 + 64;
482 cost_list = 8;
483 }
484
485 /* Estimate base cost in bits of each section type */
486 cost_list += 64 * contig + (final ? 0 : 8+64);
487 cost_range += (2 * 64) + (final ? 0 : 8+64);
488 cost_bitmap += last_gap + contig + (final ? 0 : MINIMUM(next_gap, 8+64));
489 cost_bitmap_restart += contig + (final ? 0 : MINIMUM(next_gap, 8+64));
490
491 /* Convert to byte costs for actual comparison */
492 cost_list = (cost_list + 7) / 8;
493 cost_bitmap = (cost_bitmap + 7) / 8;
494 cost_bitmap_restart = (cost_bitmap_restart + 7) / 8;
495 cost_range = (cost_range + 7) / 8;
496
497 /* Now pick the best choice */
498 *force_new_section = 0;
499 new_state = KRL_SECTION_CERT_SERIAL_BITMAP;
500 cost = cost_bitmap;
501 if (cost_range < cost) {
502 new_state = KRL_SECTION_CERT_SERIAL_RANGE;
503 cost = cost_range;
504 }
505 if (cost_list < cost) {
506 new_state = KRL_SECTION_CERT_SERIAL_LIST;
507 cost = cost_list;
508 }
509 if (cost_bitmap_restart < cost) {
510 new_state = KRL_SECTION_CERT_SERIAL_BITMAP;
511 *force_new_section = 1;
512 cost = cost_bitmap_restart;
513 }
514 KRL_DBG(("%s: contig %llu last_gap %llu next_gap %llu final %d, costs:"
515 "list %llu range %llu bitmap %llu new bitmap %llu, "
516 "selected 0x%02x%s", __func__, (long long unsigned)contig,
517 (long long unsigned)last_gap, (long long unsigned)next_gap, final,
518 (long long unsigned)cost_list, (long long unsigned)cost_range,
519 (long long unsigned)cost_bitmap,
520 (long long unsigned)cost_bitmap_restart, new_state,
521 *force_new_section ? " restart" : ""));
522 return new_state;
523 }
524
525 static int
526 put_bitmap(struct sshbuf *buf, struct bitmap *bitmap)
527 {
528 size_t len;
529 u_char *blob;
530 int r;
531
532 len = bitmap_nbytes(bitmap);
533 if ((blob = malloc(len)) == NULL)
534 return SSH_ERR_ALLOC_FAIL;
535 if (bitmap_to_string(bitmap, blob, len) != 0) {
536 free(blob);
537 return SSH_ERR_INTERNAL_ERROR;
538 }
539 r = sshbuf_put_bignum2_bytes(buf, blob, len);
540 free(blob);
541 return r;
542 }
543
544 /* Generate a KRL_SECTION_CERTIFICATES KRL section */
545 static int
546 revoked_certs_generate(struct revoked_certs *rc, struct sshbuf *buf)
547 {
548 int final, force_new_sect, r = SSH_ERR_INTERNAL_ERROR;
549 u_int64_t i, contig, gap, last = 0, bitmap_start = 0;
550 struct revoked_serial *rs, *nrs;
551 struct revoked_key_id *rki;
552 int next_state, state = 0;
553 struct sshbuf *sect;
554 struct bitmap *bitmap = NULL;
555
556 if ((sect = sshbuf_new()) == NULL)
557 return SSH_ERR_ALLOC_FAIL;
558
559 /* Store the header: optional CA scope key, reserved */
560 if (rc->ca_key == NULL) {
561 if ((r = sshbuf_put_string(buf, NULL, 0)) != 0)
562 goto out;
563 } else {
564 if ((r = sshkey_puts(rc->ca_key, buf)) != 0)
565 goto out;
566 }
567 if ((r = sshbuf_put_string(buf, NULL, 0)) != 0)
568 goto out;
569
570 /* Store the revoked serials. */
571 for (rs = RB_MIN(revoked_serial_tree, &rc->revoked_serials);
572 rs != NULL;
573 rs = RB_NEXT(revoked_serial_tree, &rc->revoked_serials, rs)) {
574 KRL_DBG(("%s: serial %llu:%llu state 0x%02x", __func__,
575 (long long unsigned)rs->lo, (long long unsigned)rs->hi,
576 state));
577
578 /* Check contiguous length and gap to next section (if any) */
579 nrs = RB_NEXT(revoked_serial_tree, &rc->revoked_serials, rs);
580 final = nrs == NULL;
581 gap = nrs == NULL ? 0 : nrs->lo - rs->hi;
582 contig = 1 + (rs->hi - rs->lo);
583
584 /* Choose next state based on these */
585 next_state = choose_next_state(state, contig, final,
586 state == 0 ? 0 : rs->lo - last, gap, &force_new_sect);
587
588 /*
589 * If the current section is a range section or has a different
590 * type to the next section, then finish it off now.
591 */
592 if (state != 0 && (force_new_sect || next_state != state ||
593 state == KRL_SECTION_CERT_SERIAL_RANGE)) {
594 KRL_DBG(("%s: finish state 0x%02x", __func__, state));
595 switch (state) {
596 case KRL_SECTION_CERT_SERIAL_LIST:
597 case KRL_SECTION_CERT_SERIAL_RANGE:
598 break;
599 case KRL_SECTION_CERT_SERIAL_BITMAP:
600 if ((r = put_bitmap(sect, bitmap)) != 0)
601 goto out;
602 bitmap_free(bitmap);
603 bitmap = NULL;
604 break;
605 }
606 if ((r = sshbuf_put_u8(buf, state)) != 0 ||
607 (r = sshbuf_put_stringb(buf, sect)) != 0)
608 goto out;
609 sshbuf_reset(sect);
610 }
611
612 /* If we are starting a new section then prepare it now */
613 if (next_state != state || force_new_sect) {
614 KRL_DBG(("%s: start state 0x%02x", __func__,
615 next_state));
616 state = next_state;
617 sshbuf_reset(sect);
618 switch (state) {
619 case KRL_SECTION_CERT_SERIAL_LIST:
620 case KRL_SECTION_CERT_SERIAL_RANGE:
621 break;
622 case KRL_SECTION_CERT_SERIAL_BITMAP:
623 if ((bitmap = bitmap_new()) == NULL) {
624 r = SSH_ERR_ALLOC_FAIL;
625 goto out;
626 }
627 bitmap_start = rs->lo;
628 if ((r = sshbuf_put_u64(sect,
629 bitmap_start)) != 0)
630 goto out;
631 break;
632 }
633 }
634
635 /* Perform section-specific processing */
636 switch (state) {
637 case KRL_SECTION_CERT_SERIAL_LIST:
638 for (i = 0; i < contig; i++) {
639 if ((r = sshbuf_put_u64(sect, rs->lo + i)) != 0)
640 goto out;
641 }
642 break;
643 case KRL_SECTION_CERT_SERIAL_RANGE:
644 if ((r = sshbuf_put_u64(sect, rs->lo)) != 0 ||
645 (r = sshbuf_put_u64(sect, rs->hi)) != 0)
646 goto out;
647 break;
648 case KRL_SECTION_CERT_SERIAL_BITMAP:
649 if (rs->lo - bitmap_start > INT_MAX) {
650 error("%s: insane bitmap gap", __func__);
651 goto out;
652 }
653 for (i = 0; i < contig; i++) {
654 if (bitmap_set_bit(bitmap,
655 rs->lo + i - bitmap_start) != 0) {
656 r = SSH_ERR_ALLOC_FAIL;
657 goto out;
658 }
659 }
660 break;
661 }
662 last = rs->hi;
663 }
664 /* Flush the remaining section, if any */
665 if (state != 0) {
666 KRL_DBG(("%s: serial final flush for state 0x%02x",
667 __func__, state));
668 switch (state) {
669 case KRL_SECTION_CERT_SERIAL_LIST:
670 case KRL_SECTION_CERT_SERIAL_RANGE:
671 break;
672 case KRL_SECTION_CERT_SERIAL_BITMAP:
673 if ((r = put_bitmap(sect, bitmap)) != 0)
674 goto out;
675 bitmap_free(bitmap);
676 bitmap = NULL;
677 break;
678 }
679 if ((r = sshbuf_put_u8(buf, state)) != 0 ||
680 (r = sshbuf_put_stringb(buf, sect)) != 0)
681 goto out;
682 }
683 KRL_DBG(("%s: serial done ", __func__));
684
685 /* Now output a section for any revocations by key ID */
686 sshbuf_reset(sect);
687 RB_FOREACH(rki, revoked_key_id_tree, &rc->revoked_key_ids) {
688 KRL_DBG(("%s: key ID %s", __func__, rki->key_id));
689 if ((r = sshbuf_put_cstring(sect, rki->key_id)) != 0)
690 goto out;
691 }
692 if (sshbuf_len(sect) != 0) {
693 if ((r = sshbuf_put_u8(buf, KRL_SECTION_CERT_KEY_ID)) != 0 ||
694 (r = sshbuf_put_stringb(buf, sect)) != 0)
695 goto out;
696 }
697 r = 0;
698 out:
699 bitmap_free(bitmap);
700 sshbuf_free(sect);
701 return r;
702 }
703
704 int
705 ssh_krl_to_blob(struct ssh_krl *krl, struct sshbuf *buf,
706 const struct sshkey **sign_keys, u_int nsign_keys)
707 {
708 int r = SSH_ERR_INTERNAL_ERROR;
709 struct revoked_certs *rc;
710 struct revoked_blob *rb;
711 struct sshbuf *sect;
712 u_char *sblob = NULL;
713 size_t slen, i;
714
715 if (krl->generated_date == 0)
716 krl->generated_date = time(NULL);
717
718 if ((sect = sshbuf_new()) == NULL)
719 return SSH_ERR_ALLOC_FAIL;
720
721 /* Store the header */
722 if ((r = sshbuf_put(buf, KRL_MAGIC, sizeof(KRL_MAGIC) - 1)) != 0 ||
723 (r = sshbuf_put_u32(buf, KRL_FORMAT_VERSION)) != 0 ||
724 (r = sshbuf_put_u64(buf, krl->krl_version)) != 0 ||
725 (r = sshbuf_put_u64(buf, krl->generated_date)) != 0 ||
726 (r = sshbuf_put_u64(buf, krl->flags)) != 0 ||
727 (r = sshbuf_put_string(buf, NULL, 0)) != 0 ||
728 (r = sshbuf_put_cstring(buf, krl->comment)) != 0)
729 goto out;
730
731 /* Store sections for revoked certificates */
732 TAILQ_FOREACH(rc, &krl->revoked_certs, entry) {
733 sshbuf_reset(sect);
734 if ((r = revoked_certs_generate(rc, sect)) != 0)
735 goto out;
736 if ((r = sshbuf_put_u8(buf, KRL_SECTION_CERTIFICATES)) != 0 ||
737 (r = sshbuf_put_stringb(buf, sect)) != 0)
738 goto out;
739 }
740
741 /* Finally, output sections for revocations by public key/hash */
742 sshbuf_reset(sect);
743 RB_FOREACH(rb, revoked_blob_tree, &krl->revoked_keys) {
744 KRL_DBG(("%s: key len %zu ", __func__, rb->len));
745 if ((r = sshbuf_put_string(sect, rb->blob, rb->len)) != 0)
746 goto out;
747 }
748 if (sshbuf_len(sect) != 0) {
749 if ((r = sshbuf_put_u8(buf, KRL_SECTION_EXPLICIT_KEY)) != 0 ||
750 (r = sshbuf_put_stringb(buf, sect)) != 0)
751 goto out;
752 }
753 sshbuf_reset(sect);
754 RB_FOREACH(rb, revoked_blob_tree, &krl->revoked_sha1s) {
755 KRL_DBG(("%s: hash len %zu ", __func__, rb->len));
756 if ((r = sshbuf_put_string(sect, rb->blob, rb->len)) != 0)
757 goto out;
758 }
759 if (sshbuf_len(sect) != 0) {
760 if ((r = sshbuf_put_u8(buf,
761 KRL_SECTION_FINGERPRINT_SHA1)) != 0 ||
762 (r = sshbuf_put_stringb(buf, sect)) != 0)
763 goto out;
764 }
765
766 for (i = 0; i < nsign_keys; i++) {
767 KRL_DBG(("%s: signature key %s", __func__,
768 sshkey_ssh_name(sign_keys[i])));
769 if ((r = sshbuf_put_u8(buf, KRL_SECTION_SIGNATURE)) != 0 ||
770 (r = sshkey_puts(sign_keys[i], buf)) != 0)
771 goto out;
772
773 if ((r = sshkey_sign(sign_keys[i], &sblob, &slen,
774 sshbuf_ptr(buf), sshbuf_len(buf), NULL, 0)) != 0)
775 goto out;
776 KRL_DBG(("%s: signature sig len %zu", __func__, slen));
777 if ((r = sshbuf_put_string(buf, sblob, slen)) != 0)
778 goto out;
779 }
780
781 r = 0;
782 out:
783 free(sblob);
784 sshbuf_free(sect);
785 return r;
786 }
787
788 static void
789 format_timestamp(u_int64_t timestamp, char *ts, size_t nts)
790 {
791 time_t t;
792 struct tm *tm;
793
794 t = timestamp;
795 tm = localtime(&t);
796 if (tm == NULL)
797 strlcpy(ts, "<INVALID>", nts);
798 else {
799 *ts = '\0';
800 strftime(ts, nts, "%Y%m%dT%H%M%S", tm);
801 }
802 }
803
804 static int
805 parse_revoked_certs(struct sshbuf *buf, struct ssh_krl *krl)
806 {
807 int r = SSH_ERR_INTERNAL_ERROR;
808 u_char type;
809 const u_char *blob;
810 size_t blen, nbits;
811 struct sshbuf *subsect = NULL;
812 u_int64_t serial, serial_lo, serial_hi;
813 struct bitmap *bitmap = NULL;
814 char *key_id = NULL;
815 struct sshkey *ca_key = NULL;
816
817 if ((subsect = sshbuf_new()) == NULL)
818 return SSH_ERR_ALLOC_FAIL;
819
820 /* Header: key, reserved */
821 if ((r = sshbuf_get_string_direct(buf, &blob, &blen)) != 0 ||
822 (r = sshbuf_skip_string(buf)) != 0)
823 goto out;
824 if (blen != 0 && (r = sshkey_from_blob(blob, blen, &ca_key)) != 0)
825 goto out;
826
827 while (sshbuf_len(buf) > 0) {
828 sshbuf_free(subsect);
829 subsect = NULL;
830 if ((r = sshbuf_get_u8(buf, &type)) != 0 ||
831 (r = sshbuf_froms(buf, &subsect)) != 0)
832 goto out;
833 KRL_DBG(("%s: subsection type 0x%02x", __func__, type));
834 /* sshbuf_dump(subsect, stderr); */
835
836 switch (type) {
837 case KRL_SECTION_CERT_SERIAL_LIST:
838 while (sshbuf_len(subsect) > 0) {
839 if ((r = sshbuf_get_u64(subsect, &serial)) != 0)
840 goto out;
841 if ((r = ssh_krl_revoke_cert_by_serial(krl,
842 ca_key, serial)) != 0)
843 goto out;
844 }
845 break;
846 case KRL_SECTION_CERT_SERIAL_RANGE:
847 if ((r = sshbuf_get_u64(subsect, &serial_lo)) != 0 ||
848 (r = sshbuf_get_u64(subsect, &serial_hi)) != 0)
849 goto out;
850 if ((r = ssh_krl_revoke_cert_by_serial_range(krl,
851 ca_key, serial_lo, serial_hi)) != 0)
852 goto out;
853 break;
854 case KRL_SECTION_CERT_SERIAL_BITMAP:
855 if ((bitmap = bitmap_new()) == NULL) {
856 r = SSH_ERR_ALLOC_FAIL;
857 goto out;
858 }
859 if ((r = sshbuf_get_u64(subsect, &serial_lo)) != 0 ||
860 (r = sshbuf_get_bignum2_bytes_direct(subsect,
861 &blob, &blen)) != 0)
862 goto out;
863 if (bitmap_from_string(bitmap, blob, blen) != 0) {
864 r = SSH_ERR_INVALID_FORMAT;
865 goto out;
866 }
867 nbits = bitmap_nbits(bitmap);
868 for (serial = 0; serial < (u_int64_t)nbits; serial++) {
869 if (serial > 0 && serial_lo + serial == 0) {
870 error("%s: bitmap wraps u64", __func__);
871 r = SSH_ERR_INVALID_FORMAT;
872 goto out;
873 }
874 if (!bitmap_test_bit(bitmap, serial))
875 continue;
876 if ((r = ssh_krl_revoke_cert_by_serial(krl,
877 ca_key, serial_lo + serial)) != 0)
878 goto out;
879 }
880 bitmap_free(bitmap);
881 bitmap = NULL;
882 break;
883 case KRL_SECTION_CERT_KEY_ID:
884 while (sshbuf_len(subsect) > 0) {
885 if ((r = sshbuf_get_cstring(subsect,
886 &key_id, NULL)) != 0)
887 goto out;
888 if ((r = ssh_krl_revoke_cert_by_key_id(krl,
889 ca_key, key_id)) != 0)
890 goto out;
891 free(key_id);
892 key_id = NULL;
893 }
894 break;
895 default:
896 error("Unsupported KRL certificate section %u", type);
897 r = SSH_ERR_INVALID_FORMAT;
898 goto out;
899 }
900 if (sshbuf_len(subsect) > 0) {
901 error("KRL certificate section contains unparsed data");
902 r = SSH_ERR_INVALID_FORMAT;
903 goto out;
904 }
905 }
906
907 r = 0;
908 out:
909 if (bitmap != NULL)
910 bitmap_free(bitmap);
911 free(key_id);
912 sshkey_free(ca_key);
913 sshbuf_free(subsect);
914 return r;
915 }
916
917
918 /* Attempt to parse a KRL, checking its signature (if any) with sign_ca_keys. */
919 int
920 ssh_krl_from_blob(struct sshbuf *buf, struct ssh_krl **krlp,
921 const struct sshkey **sign_ca_keys, size_t nsign_ca_keys)
922 {
923 struct sshbuf *copy = NULL, *sect = NULL;
924 struct ssh_krl *krl = NULL;
925 char timestamp[64];
926 int r = SSH_ERR_INTERNAL_ERROR, sig_seen;
927 struct sshkey *key = NULL, **ca_used = NULL, **tmp_ca_used;
928 u_char type, *rdata = NULL;
929 const u_char *blob;
930 size_t i, j, sig_off, sects_off, rlen, blen, nca_used;
931 u_int format_version;
932
933 nca_used = 0;
934 *krlp = NULL;
935 if (sshbuf_len(buf) < sizeof(KRL_MAGIC) - 1 ||
936 memcmp(sshbuf_ptr(buf), KRL_MAGIC, sizeof(KRL_MAGIC) - 1) != 0) {
937 debug3("%s: not a KRL", __func__);
938 return SSH_ERR_KRL_BAD_MAGIC;
939 }
940
941 /* Take a copy of the KRL buffer so we can verify its signature later */
942 if ((copy = sshbuf_fromb(buf)) == NULL) {
943 r = SSH_ERR_ALLOC_FAIL;
944 goto out;
945 }
946 if ((r = sshbuf_consume(copy, sizeof(KRL_MAGIC) - 1)) != 0)
947 goto out;
948
949 if ((krl = ssh_krl_init()) == NULL) {
950 error("%s: alloc failed", __func__);
951 goto out;
952 }
953
954 if ((r = sshbuf_get_u32(copy, &format_version)) != 0)
955 goto out;
956 if (format_version != KRL_FORMAT_VERSION) {
957 r = SSH_ERR_INVALID_FORMAT;
958 goto out;
959 }
960 if ((r = sshbuf_get_u64(copy, &krl->krl_version)) != 0 ||
961 (r = sshbuf_get_u64(copy, &krl->generated_date)) != 0 ||
962 (r = sshbuf_get_u64(copy, &krl->flags)) != 0 ||
963 (r = sshbuf_skip_string(copy)) != 0 ||
964 (r = sshbuf_get_cstring(copy, &krl->comment, NULL)) != 0)
965 goto out;
966
967 format_timestamp(krl->generated_date, timestamp, sizeof(timestamp));
968 debug("KRL version %llu generated at %s%s%s",
969 (long long unsigned)krl->krl_version, timestamp,
970 *krl->comment ? ": " : "", krl->comment);
971
972 /*
973 * 1st pass: verify signatures, if any. This is done to avoid
974 * detailed parsing of data whose provenance is unverified.
975 */
976 sig_seen = 0;
977 if (sshbuf_len(buf) < sshbuf_len(copy)) {
978 /* Shouldn't happen */
979 r = SSH_ERR_INTERNAL_ERROR;
980 goto out;
981 }
982 sects_off = sshbuf_len(buf) - sshbuf_len(copy);
983 while (sshbuf_len(copy) > 0) {
984 if ((r = sshbuf_get_u8(copy, &type)) != 0 ||
985 (r = sshbuf_get_string_direct(copy, &blob, &blen)) != 0)
986 goto out;
987 KRL_DBG(("%s: first pass, section 0x%02x", __func__, type));
988 if (type != KRL_SECTION_SIGNATURE) {
989 if (sig_seen) {
990 error("KRL contains non-signature section "
991 "after signature");
992 r = SSH_ERR_INVALID_FORMAT;
993 goto out;
994 }
995 /* Not interested for now. */
996 continue;
997 }
998 sig_seen = 1;
999 /* First string component is the signing key */
1000 if ((r = sshkey_from_blob(blob, blen, &key)) != 0) {
1001 r = SSH_ERR_INVALID_FORMAT;
1002 goto out;
1003 }
1004 if (sshbuf_len(buf) < sshbuf_len(copy)) {
1005 /* Shouldn't happen */
1006 r = SSH_ERR_INTERNAL_ERROR;
1007 goto out;
1008 }
1009 sig_off = sshbuf_len(buf) - sshbuf_len(copy);
1010 /* Second string component is the signature itself */
1011 if ((r = sshbuf_get_string_direct(copy, &blob, &blen)) != 0) {
1012 r = SSH_ERR_INVALID_FORMAT;
1013 goto out;
1014 }
1015 /* Check signature over entire KRL up to this point */
1016 if ((r = sshkey_verify(key, blob, blen,
1017 sshbuf_ptr(buf), sig_off, 0)) != 0)
1018 goto out;
1019 /* Check if this key has already signed this KRL */
1020 for (i = 0; i < nca_used; i++) {
1021 if (sshkey_equal(ca_used[i], key)) {
1022 error("KRL signed more than once with "
1023 "the same key");
1024 r = SSH_ERR_INVALID_FORMAT;
1025 goto out;
1026 }
1027 }
1028 /* Record keys used to sign the KRL */
1029 tmp_ca_used = recallocarray(ca_used, nca_used, nca_used + 1,
1030 sizeof(*ca_used));
1031 if (tmp_ca_used == NULL) {
1032 r = SSH_ERR_ALLOC_FAIL;
1033 goto out;
1034 }
1035 ca_used = tmp_ca_used;
1036 ca_used[nca_used++] = key;
1037 key = NULL;
1038 }
1039
1040 if (sshbuf_len(copy) != 0) {
1041 /* Shouldn't happen */
1042 r = SSH_ERR_INTERNAL_ERROR;
1043 goto out;
1044 }
1045
1046 /*
1047 * 2nd pass: parse and load the KRL, skipping the header to the point
1048 * where the section start.
1049 */
1050 sshbuf_free(copy);
1051 if ((copy = sshbuf_fromb(buf)) == NULL) {
1052 r = SSH_ERR_ALLOC_FAIL;
1053 goto out;
1054 }
1055 if ((r = sshbuf_consume(copy, sects_off)) != 0)
1056 goto out;
1057 while (sshbuf_len(copy) > 0) {
1058 sshbuf_free(sect);
1059 sect = NULL;
1060 if ((r = sshbuf_get_u8(copy, &type)) != 0 ||
1061 (r = sshbuf_froms(copy, &sect)) != 0)
1062 goto out;
1063 KRL_DBG(("%s: second pass, section 0x%02x", __func__, type));
1064
1065 switch (type) {
1066 case KRL_SECTION_CERTIFICATES:
1067 if ((r = parse_revoked_certs(sect, krl)) != 0)
1068 goto out;
1069 break;
1070 case KRL_SECTION_EXPLICIT_KEY:
1071 case KRL_SECTION_FINGERPRINT_SHA1:
1072 while (sshbuf_len(sect) > 0) {
1073 if ((r = sshbuf_get_string(sect,
1074 &rdata, &rlen)) != 0)
1075 goto out;
1076 if (type == KRL_SECTION_FINGERPRINT_SHA1 &&
1077 rlen != 20) {
1078 error("%s: bad SHA1 length", __func__);
1079 r = SSH_ERR_INVALID_FORMAT;
1080 goto out;
1081 }
1082 if ((r = revoke_blob(
1083 type == KRL_SECTION_EXPLICIT_KEY ?
1084 &krl->revoked_keys : &krl->revoked_sha1s,
1085 rdata, rlen)) != 0)
1086 goto out;
1087 rdata = NULL; /* revoke_blob frees rdata */
1088 }
1089 break;
1090 case KRL_SECTION_SIGNATURE:
1091 /* Handled above, but still need to stay in synch */
1092 sshbuf_free(sect);
1093 sect = NULL;
1094 if ((r = sshbuf_skip_string(copy)) != 0)
1095 goto out;
1096 break;
1097 default:
1098 error("Unsupported KRL section %u", type);
1099 r = SSH_ERR_INVALID_FORMAT;
1100 goto out;
1101 }
1102 if (sect != NULL && sshbuf_len(sect) > 0) {
1103 error("KRL section contains unparsed data");
1104 r = SSH_ERR_INVALID_FORMAT;
1105 goto out;
1106 }
1107 }
1108
1109 /* Check that the key(s) used to sign the KRL weren't revoked */
1110 sig_seen = 0;
1111 for (i = 0; i < nca_used; i++) {
1112 if (ssh_krl_check_key(krl, ca_used[i]) == 0)
1113 sig_seen = 1;
1114 else {
1115 sshkey_free(ca_used[i]);
1116 ca_used[i] = NULL;
1117 }
1118 }
1119 if (nca_used && !sig_seen) {
1120 error("All keys used to sign KRL were revoked");
1121 r = SSH_ERR_KEY_REVOKED;
1122 goto out;
1123 }
1124
1125 /* If we have CA keys, then verify that one was used to sign the KRL */
1126 if (sig_seen && nsign_ca_keys != 0) {
1127 sig_seen = 0;
1128 for (i = 0; !sig_seen && i < nsign_ca_keys; i++) {
1129 for (j = 0; j < nca_used; j++) {
1130 if (ca_used[j] == NULL)
1131 continue;
1132 if (sshkey_equal(ca_used[j], sign_ca_keys[i])) {
1133 sig_seen = 1;
1134 break;
1135 }
1136 }
1137 }
1138 if (!sig_seen) {
1139 r = SSH_ERR_SIGNATURE_INVALID;
1140 error("KRL not signed with any trusted key");
1141 goto out;
1142 }
1143 }
1144
1145 *krlp = krl;
1146 r = 0;
1147 out:
1148 if (r != 0)
1149 ssh_krl_free(krl);
1150 for (i = 0; i < nca_used; i++)
1151 sshkey_free(ca_used[i]);
1152 free(ca_used);
1153 free(rdata);
1154 sshkey_free(key);
1155 sshbuf_free(copy);
1156 sshbuf_free(sect);
1157 return r;
1158 }
1159
1160 /* Checks certificate serial number and key ID revocation */
1161 static int
1162 is_cert_revoked(const struct sshkey *key, struct revoked_certs *rc)
1163 {
1164 struct revoked_serial rs, *ers;
1165 struct revoked_key_id rki, *erki;
1166
1167 /* Check revocation by cert key ID */
1168 memset(&rki, 0, sizeof(rki));
1169 rki.key_id = key->cert->key_id;
1170 erki = RB_FIND(revoked_key_id_tree, &rc->revoked_key_ids, &rki);
1171 if (erki != NULL) {
1172 KRL_DBG(("%s: revoked by key ID", __func__));
1173 return SSH_ERR_KEY_REVOKED;
1174 }
1175
1176 /*
1177 * Zero serials numbers are ignored (it's the default when the
1178 * CA doesn't specify one).
1179 */
1180 if (key->cert->serial == 0)
1181 return 0;
1182
1183 memset(&rs, 0, sizeof(rs));
1184 rs.lo = rs.hi = key->cert->serial;
1185 ers = RB_FIND(revoked_serial_tree, &rc->revoked_serials, &rs);
1186 if (ers != NULL) {
1187 KRL_DBG(("%s: revoked serial %llu matched %llu:%llu", __func__,
1188 key->cert->serial, ers->lo, ers->hi));
1189 return SSH_ERR_KEY_REVOKED;
1190 }
1191 return 0;
1192 }
1193
1194 /* Checks whether a given key/cert is revoked. Does not check its CA */
1195 static int
1196 is_key_revoked(struct ssh_krl *krl, const struct sshkey *key)
1197 {
1198 struct revoked_blob rb, *erb;
1199 struct revoked_certs *rc;
1200 int r;
1201
1202 /* Check explicitly revoked hashes first */
1203 memset(&rb, 0, sizeof(rb));
1204 if ((r = sshkey_fingerprint_raw(key, SSH_DIGEST_SHA1,
1205 &rb.blob, &rb.len)) != 0)
1206 return r;
1207 erb = RB_FIND(revoked_blob_tree, &krl->revoked_sha1s, &rb);
1208 free(rb.blob);
1209 if (erb != NULL) {
1210 KRL_DBG(("%s: revoked by key SHA1", __func__));
1211 return SSH_ERR_KEY_REVOKED;
1212 }
1213
1214 /* Next, explicit keys */
1215 memset(&rb, 0, sizeof(rb));
1216 if ((r = plain_key_blob(key, &rb.blob, &rb.len)) != 0)
1217 return r;
1218 erb = RB_FIND(revoked_blob_tree, &krl->revoked_keys, &rb);
1219 free(rb.blob);
1220 if (erb != NULL) {
1221 KRL_DBG(("%s: revoked by explicit key", __func__));
1222 return SSH_ERR_KEY_REVOKED;
1223 }
1224
1225 if (!sshkey_is_cert(key))
1226 return 0;
1227
1228 /* Check cert revocation for the specified CA */
1229 if ((r = revoked_certs_for_ca_key(krl, key->cert->signature_key,
1230 &rc, 0)) != 0)
1231 return r;
1232 if (rc != NULL) {
1233 if ((r = is_cert_revoked(key, rc)) != 0)
1234 return r;
1235 }
1236 /* Check cert revocation for the wildcard CA */
1237 if ((r = revoked_certs_for_ca_key(krl, NULL, &rc, 0)) != 0)
1238 return r;
1239 if (rc != NULL) {
1240 if ((r = is_cert_revoked(key, rc)) != 0)
1241 return r;
1242 }
1243
1244 KRL_DBG(("%s: %llu no match", __func__, key->cert->serial));
1245 return 0;
1246 }
1247
1248 int
1249 ssh_krl_check_key(struct ssh_krl *krl, const struct sshkey *key)
1250 {
1251 int r;
1252
1253 KRL_DBG(("%s: checking key", __func__));
1254 if ((r = is_key_revoked(krl, key)) != 0)
1255 return r;
1256 if (sshkey_is_cert(key)) {
1257 debug2("%s: checking CA key", __func__);
1258 if ((r = is_key_revoked(krl, key->cert->signature_key)) != 0)
1259 return r;
1260 }
1261 KRL_DBG(("%s: key okay", __func__));
1262 return 0;
1263 }
1264
1265 int
1266 ssh_krl_file_contains_key(const char *path, const struct sshkey *key)
1267 {
1268 struct sshbuf *krlbuf = NULL;
1269 struct ssh_krl *krl = NULL;
1270 int oerrno = 0, r, fd;
1271
1272 if (path == NULL)
1273 return 0;
1274
1275 if ((krlbuf = sshbuf_new()) == NULL)
1276 return SSH_ERR_ALLOC_FAIL;
1277 if ((fd = open(path, O_RDONLY)) == -1) {
1278 r = SSH_ERR_SYSTEM_ERROR;
1279 oerrno = errno;
1280 goto out;
1281 }
1282 if ((r = sshkey_load_file(fd, krlbuf)) != 0) {
1283 oerrno = errno;
1284 goto out;
1285 }
1286 if ((r = ssh_krl_from_blob(krlbuf, &krl, NULL, 0)) != 0)
1287 goto out;
1288 debug2("%s: checking KRL %s", __func__, path);
1289 r = ssh_krl_check_key(krl, key);
1290 out:
1291 if (fd != -1)
1292 close(fd);
1293 sshbuf_free(krlbuf);
1294 ssh_krl_free(krl);
1295 if (r != 0)
1296 errno = oerrno;
1297 return r;
1298 }
DragonFly BSD