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 1.41 2017/12/18 02:25:15 djm Exp $ */ 18 19 #include <sys/types.h> 20 #include <sys/tree.h> 21 #include <sys/queue.h> 22 23 #include <errno.h> 24 #include <fcntl.h> 25 #include <limits.h> 26 #include <string.h> 27 #include <time.h> 28 #include <unistd.h> 29 30 #include "sshbuf.h" 31 #include "ssherr.h" 32 #include "sshkey.h" 33 #include "authfile.h" 34 #include "misc.h" 35 #include "log.h" 36 #include "digest.h" 37 #include "bitmap.h" 38 39 #include "krl.h" 40 41 /* #define DEBUG_KRL */ 42 #ifdef DEBUG_KRL 43 # define KRL_DBG(x) debug3 x 44 #else 45 # define KRL_DBG(x) 46 #endif 47 48 /* 49 * Trees of revoked serial numbers, key IDs and keys. This allows 50 * quick searching, querying and producing lists in canonical order. 51 */ 52 53 /* Tree of serial numbers. XXX make smarter: really need a real sparse bitmap */ 54 struct revoked_serial { 55 u_int64_t lo, hi; 56 RB_ENTRY(revoked_serial) tree_entry; 57 }; 58 static int serial_cmp(struct revoked_serial *a, struct revoked_serial *b); 59 RB_HEAD(revoked_serial_tree, revoked_serial); 60 RB_GENERATE_STATIC(revoked_serial_tree, revoked_serial, tree_entry, serial_cmp); 61 62 /* Tree of key IDs */ 63 struct revoked_key_id { 64 char *key_id; 65 RB_ENTRY(revoked_key_id) tree_entry; 66 }; 67 static int key_id_cmp(struct revoked_key_id *a, struct revoked_key_id *b); 68 RB_HEAD(revoked_key_id_tree, revoked_key_id); 69 RB_GENERATE_STATIC(revoked_key_id_tree, revoked_key_id, tree_entry, key_id_cmp); 70 71 /* Tree of blobs (used for keys and fingerprints) */ 72 struct revoked_blob { 73 u_char *blob; 74 size_t len; 75 RB_ENTRY(revoked_blob) tree_entry; 76 }; 77 static int blob_cmp(struct revoked_blob *a, struct revoked_blob *b); 78 RB_HEAD(revoked_blob_tree, revoked_blob); 79 RB_GENERATE_STATIC(revoked_blob_tree, revoked_blob, tree_entry, blob_cmp); 80 81 /* Tracks revoked certs for a single CA */ 82 struct revoked_certs { 83 struct sshkey *ca_key; 84 struct revoked_serial_tree revoked_serials; 85 struct revoked_key_id_tree revoked_key_ids; 86 TAILQ_ENTRY(revoked_certs) entry; 87 }; 88 TAILQ_HEAD(revoked_certs_list, revoked_certs); 89 90 struct ssh_krl { 91 u_int64_t krl_version; 92 u_int64_t generated_date; 93 u_int64_t flags; 94 char *comment; 95 struct revoked_blob_tree revoked_keys; 96 struct revoked_blob_tree revoked_sha1s; 97 struct revoked_certs_list revoked_certs; 98 }; 99 100 /* Return equal if a and b overlap */ 101 static int 102 serial_cmp(struct revoked_serial *a, struct revoked_serial *b) 103 { 104 if (a->hi >= b->lo && a->lo <= b->hi) 105 return 0; 106 return a->lo < b->lo ? -1 : 1; 107 } 108 109 static int 110 key_id_cmp(struct revoked_key_id *a, struct revoked_key_id *b) 111 { 112 return strcmp(a->key_id, b->key_id); 113 } 114 115 static int 116 blob_cmp(struct revoked_blob *a, struct revoked_blob *b) 117 { 118 int r; 119 120 if (a->len != b->len) { 121 if ((r = memcmp(a->blob, b->blob, MINIMUM(a->len, b->len))) != 0) 122 return r; 123 return a->len > b->len ? 1 : -1; 124 } else 125 return memcmp(a->blob, b->blob, a->len); 126 } 127 128 struct ssh_krl * 129 ssh_krl_init(void) 130 { 131 struct ssh_krl *krl; 132 133 if ((krl = calloc(1, sizeof(*krl))) == NULL) 134 return NULL; 135 RB_INIT(&krl->revoked_keys); 136 RB_INIT(&krl->revoked_sha1s); 137 TAILQ_INIT(&krl->revoked_certs); 138 return krl; 139 } 140 141 static void 142 revoked_certs_free(struct revoked_certs *rc) 143 { 144 struct revoked_serial *rs, *trs; 145 struct revoked_key_id *rki, *trki; 146 147 RB_FOREACH_SAFE(rs, revoked_serial_tree, &rc->revoked_serials, trs) { 148 RB_REMOVE(revoked_serial_tree, &rc->revoked_serials, rs); 149 free(rs); 150 } 151 RB_FOREACH_SAFE(rki, revoked_key_id_tree, &rc->revoked_key_ids, trki) { 152 RB_REMOVE(revoked_key_id_tree, &rc->revoked_key_ids, rki); 153 free(rki->key_id); 154 free(rki); 155 } 156 sshkey_free(rc->ca_key); 157 } 158 159 void 160 ssh_krl_free(struct ssh_krl *krl) 161 { 162 struct revoked_blob *rb, *trb; 163 struct revoked_certs *rc, *trc; 164 165 if (krl == NULL) 166 return; 167 168 free(krl->comment); 169 RB_FOREACH_SAFE(rb, revoked_blob_tree, &krl->revoked_keys, trb) { 170 RB_REMOVE(revoked_blob_tree, &krl->revoked_keys, rb); 171 free(rb->blob); 172 free(rb); 173 } 174 RB_FOREACH_SAFE(rb, revoked_blob_tree, &krl->revoked_sha1s, trb) { 175 RB_REMOVE(revoked_blob_tree, &krl->revoked_sha1s, rb); 176 free(rb->blob); 177 free(rb); 178 } 179 TAILQ_FOREACH_SAFE(rc, &krl->revoked_certs, entry, trc) { 180 TAILQ_REMOVE(&krl->revoked_certs, rc, entry); 181 revoked_certs_free(rc); 182 } 183 } 184 185 void 186 ssh_krl_set_version(struct ssh_krl *krl, u_int64_t version) 187 { 188 krl->krl_version = version; 189 } 190 191 int 192 ssh_krl_set_comment(struct ssh_krl *krl, const char *comment) 193 { 194 free(krl->comment); 195 if ((krl->comment = strdup(comment)) == NULL) 196 return SSH_ERR_ALLOC_FAIL; 197 return 0; 198 } 199 200 /* 201 * Find the revoked_certs struct for a CA key. If allow_create is set then 202 * create a new one in the tree if one did not exist already. 203 */ 204 static int 205 revoked_certs_for_ca_key(struct ssh_krl *krl, const struct sshkey *ca_key, 206 struct revoked_certs **rcp, int allow_create) 207 { 208 struct revoked_certs *rc; 209 int r; 210 211 *rcp = NULL; 212 TAILQ_FOREACH(rc, &krl->revoked_certs, entry) { 213 if ((ca_key == NULL && rc->ca_key == NULL) || 214 sshkey_equal(rc->ca_key, ca_key)) { 215 *rcp = rc; 216 return 0; 217 } 218 } 219 if (!allow_create) 220 return 0; 221 /* If this CA doesn't exist in the list then add it now */ 222 if ((rc = calloc(1, sizeof(*rc))) == NULL) 223 return SSH_ERR_ALLOC_FAIL; 224 if (ca_key == NULL) 225 rc->ca_key = NULL; 226 else if ((r = sshkey_from_private(ca_key, &rc->ca_key)) != 0) { 227 free(rc); 228 return r; 229 } 230 RB_INIT(&rc->revoked_serials); 231 RB_INIT(&rc->revoked_key_ids); 232 TAILQ_INSERT_TAIL(&krl->revoked_certs, rc, entry); 233 KRL_DBG(("%s: new CA %s", __func__, 234 ca_key == NULL ? "*" : sshkey_type(ca_key))); 235 *rcp = rc; 236 return 0; 237 } 238 239 static int 240 insert_serial_range(struct revoked_serial_tree *rt, u_int64_t lo, u_int64_t hi) 241 { 242 struct revoked_serial rs, *ers, *crs, *irs; 243 244 KRL_DBG(("%s: insert %llu:%llu", __func__, lo, hi)); 245 memset(&rs, 0, sizeof(rs)); 246 rs.lo = lo; 247 rs.hi = hi; 248 ers = RB_NFIND(revoked_serial_tree, rt, &rs); 249 if (ers == NULL || serial_cmp(ers, &rs) != 0) { 250 /* No entry matches. Just insert */ 251 if ((irs = malloc(sizeof(rs))) == NULL) 252 return SSH_ERR_ALLOC_FAIL; 253 memcpy(irs, &rs, sizeof(*irs)); 254 ers = RB_INSERT(revoked_serial_tree, rt, irs); 255 if (ers != NULL) { 256 KRL_DBG(("%s: bad: ers != NULL", __func__)); 257 /* Shouldn't happen */ 258 free(irs); 259 return SSH_ERR_INTERNAL_ERROR; 260 } 261 ers = irs; 262 } else { 263 KRL_DBG(("%s: overlap found %llu:%llu", __func__, 264 ers->lo, ers->hi)); 265 /* 266 * The inserted entry overlaps an existing one. Grow the 267 * existing entry. 268 */ 269 if (ers->lo > lo) 270 ers->lo = lo; 271 if (ers->hi < hi) 272 ers->hi = hi; 273 } 274 275 /* 276 * The inserted or revised range might overlap or abut adjacent ones; 277 * coalesce as necessary. 278 */ 279 280 /* Check predecessors */ 281 while ((crs = RB_PREV(revoked_serial_tree, rt, ers)) != NULL) { 282 KRL_DBG(("%s: pred %llu:%llu", __func__, crs->lo, crs->hi)); 283 if (ers->lo != 0 && crs->hi < ers->lo - 1) 284 break; 285 /* This entry overlaps. */ 286 if (crs->lo < ers->lo) { 287 ers->lo = crs->lo; 288 KRL_DBG(("%s: pred extend %llu:%llu", __func__, 289 ers->lo, ers->hi)); 290 } 291 RB_REMOVE(revoked_serial_tree, rt, crs); 292 free(crs); 293 } 294 /* Check successors */ 295 while ((crs = RB_NEXT(revoked_serial_tree, rt, ers)) != NULL) { 296 KRL_DBG(("%s: succ %llu:%llu", __func__, crs->lo, crs->hi)); 297 if (ers->hi != (u_int64_t)-1 && crs->lo > ers->hi + 1) 298 break; 299 /* This entry overlaps. */ 300 if (crs->hi > ers->hi) { 301 ers->hi = crs->hi; 302 KRL_DBG(("%s: succ extend %llu:%llu", __func__, 303 ers->lo, ers->hi)); 304 } 305 RB_REMOVE(revoked_serial_tree, rt, crs); 306 free(crs); 307 } 308 KRL_DBG(("%s: done, final %llu:%llu", __func__, ers->lo, ers->hi)); 309 return 0; 310 } 311 312 int 313 ssh_krl_revoke_cert_by_serial(struct ssh_krl *krl, const struct sshkey *ca_key, 314 u_int64_t serial) 315 { 316 return ssh_krl_revoke_cert_by_serial_range(krl, ca_key, serial, serial); 317 } 318 319 int 320 ssh_krl_revoke_cert_by_serial_range(struct ssh_krl *krl, 321 const struct sshkey *ca_key, u_int64_t lo, u_int64_t hi) 322 { 323 struct revoked_certs *rc; 324 int r; 325 326 if (lo > hi || lo == 0) 327 return SSH_ERR_INVALID_ARGUMENT; 328 if ((r = revoked_certs_for_ca_key(krl, ca_key, &rc, 1)) != 0) 329 return r; 330 return insert_serial_range(&rc->revoked_serials, lo, hi); 331 } 332 333 int 334 ssh_krl_revoke_cert_by_key_id(struct ssh_krl *krl, const struct sshkey *ca_key, 335 const char *key_id) 336 { 337 struct revoked_key_id *rki, *erki; 338 struct revoked_certs *rc; 339 int r; 340 341 if ((r = revoked_certs_for_ca_key(krl, ca_key, &rc, 1)) != 0) 342 return r; 343 344 KRL_DBG(("%s: revoke %s", __func__, key_id)); 345 if ((rki = calloc(1, sizeof(*rki))) == NULL || 346 (rki->key_id = strdup(key_id)) == NULL) { 347 free(rki); 348 return SSH_ERR_ALLOC_FAIL; 349 } 350 erki = RB_INSERT(revoked_key_id_tree, &rc->revoked_key_ids, rki); 351 if (erki != NULL) { 352 free(rki->key_id); 353 free(rki); 354 } 355 return 0; 356 } 357 358 /* Convert "key" to a public key blob without any certificate information */ 359 static int 360 plain_key_blob(const struct sshkey *key, u_char **blob, size_t *blen) 361 { 362 struct sshkey *kcopy; 363 int r; 364 365 if ((r = sshkey_from_private(key, &kcopy)) != 0) 366 return r; 367 if (sshkey_is_cert(kcopy)) { 368 if ((r = sshkey_drop_cert(kcopy)) != 0) { 369 sshkey_free(kcopy); 370 return r; 371 } 372 } 373 r = sshkey_to_blob(kcopy, blob, blen); 374 sshkey_free(kcopy); 375 return r; 376 } 377 378 /* Revoke a key blob. Ownership of blob is transferred to the tree */ 379 static int 380 revoke_blob(struct revoked_blob_tree *rbt, u_char *blob, size_t len) 381 { 382 struct revoked_blob *rb, *erb; 383 384 if ((rb = calloc(1, sizeof(*rb))) == NULL) 385 return SSH_ERR_ALLOC_FAIL; 386 rb->blob = blob; 387 rb->len = len; 388 erb = RB_INSERT(revoked_blob_tree, rbt, rb); 389 if (erb != NULL) { 390 free(rb->blob); 391 free(rb); 392 } 393 return 0; 394 } 395 396 int 397 ssh_krl_revoke_key_explicit(struct ssh_krl *krl, const struct sshkey *key) 398 { 399 u_char *blob; 400 size_t len; 401 int r; 402 403 debug3("%s: revoke type %s", __func__, sshkey_type(key)); 404 if ((r = plain_key_blob(key, &blob, &len)) != 0) 405 return r; 406 return revoke_blob(&krl->revoked_keys, blob, len); 407 } 408 409 int 410 ssh_krl_revoke_key_sha1(struct ssh_krl *krl, const struct sshkey *key) 411 { 412 u_char *blob; 413 size_t len; 414 int r; 415 416 debug3("%s: revoke type %s by sha1", __func__, sshkey_type(key)); 417 if ((r = sshkey_fingerprint_raw(key, SSH_DIGEST_SHA1, 418 &blob, &len)) != 0) 419 return r; 420 return revoke_blob(&krl->revoked_sha1s, blob, len); 421 } 422 423 int 424 ssh_krl_revoke_key(struct ssh_krl *krl, const struct sshkey *key) 425 { 426 if (!sshkey_is_cert(key)) 427 return ssh_krl_revoke_key_sha1(krl, key); 428 429 if (key->cert->serial == 0) { 430 return ssh_krl_revoke_cert_by_key_id(krl, 431 key->cert->signature_key, 432 key->cert->key_id); 433 } else { 434 return ssh_krl_revoke_cert_by_serial(krl, 435 key->cert->signature_key, 436 key->cert->serial); 437 } 438 } 439 440 /* 441 * Select the most compact section type to emit next in a KRL based on 442 * the current section type, the run length of contiguous revoked serial 443 * numbers and the gaps from the last and to the next revoked serial. 444 * Applies a mostly-accurate bit cost model to select the section type 445 * that will minimise the size of the resultant KRL. 446 */ 447 static int 448 choose_next_state(int current_state, u_int64_t contig, int final, 449 u_int64_t last_gap, u_int64_t next_gap, int *force_new_section) 450 { 451 int new_state; 452 u_int64_t cost, cost_list, cost_range, cost_bitmap, cost_bitmap_restart; 453 454 /* 455 * Avoid unsigned overflows. 456 * The limits are high enough to avoid confusing the calculations. 457 */ 458 contig = MINIMUM(contig, 1ULL<<31); 459 last_gap = MINIMUM(last_gap, 1ULL<<31); 460 next_gap = MINIMUM(next_gap, 1ULL<<31); 461 462 /* 463 * Calculate the cost to switch from the current state to candidates. 464 * NB. range sections only ever contain a single range, so their 465 * switching cost is independent of the current_state. 466 */ 467 cost_list = cost_bitmap = cost_bitmap_restart = 0; 468 cost_range = 8; 469 switch (current_state) { 470 case KRL_SECTION_CERT_SERIAL_LIST: 471 cost_bitmap_restart = cost_bitmap = 8 + 64; 472 break; 473 case KRL_SECTION_CERT_SERIAL_BITMAP: 474 cost_list = 8; 475 cost_bitmap_restart = 8 + 64; 476 break; 477 case KRL_SECTION_CERT_SERIAL_RANGE: 478 case 0: 479 cost_bitmap_restart = cost_bitmap = 8 + 64; 480 cost_list = 8; 481 } 482 483 /* Estimate base cost in bits of each section type */ 484 cost_list += 64 * contig + (final ? 0 : 8+64); 485 cost_range += (2 * 64) + (final ? 0 : 8+64); 486 cost_bitmap += last_gap + contig + (final ? 0 : MINIMUM(next_gap, 8+64)); 487 cost_bitmap_restart += contig + (final ? 0 : MINIMUM(next_gap, 8+64)); 488 489 /* Convert to byte costs for actual comparison */ 490 cost_list = (cost_list + 7) / 8; 491 cost_bitmap = (cost_bitmap + 7) / 8; 492 cost_bitmap_restart = (cost_bitmap_restart + 7) / 8; 493 cost_range = (cost_range + 7) / 8; 494 495 /* Now pick the best choice */ 496 *force_new_section = 0; 497 new_state = KRL_SECTION_CERT_SERIAL_BITMAP; 498 cost = cost_bitmap; 499 if (cost_range < cost) { 500 new_state = KRL_SECTION_CERT_SERIAL_RANGE; 501 cost = cost_range; 502 } 503 if (cost_list < cost) { 504 new_state = KRL_SECTION_CERT_SERIAL_LIST; 505 cost = cost_list; 506 } 507 if (cost_bitmap_restart < cost) { 508 new_state = KRL_SECTION_CERT_SERIAL_BITMAP; 509 *force_new_section = 1; 510 cost = cost_bitmap_restart; 511 } 512 KRL_DBG(("%s: contig %llu last_gap %llu next_gap %llu final %d, costs:" 513 "list %llu range %llu bitmap %llu new bitmap %llu, " 514 "selected 0x%02x%s", __func__, (long long unsigned)contig, 515 (long long unsigned)last_gap, (long long unsigned)next_gap, final, 516 (long long unsigned)cost_list, (long long unsigned)cost_range, 517 (long long unsigned)cost_bitmap, 518 (long long unsigned)cost_bitmap_restart, new_state, 519 *force_new_section ? " restart" : "")); 520 return new_state; 521 } 522 523 static int 524 put_bitmap(struct sshbuf *buf, struct bitmap *bitmap) 525 { 526 size_t len; 527 u_char *blob; 528 int r; 529 530 len = bitmap_nbytes(bitmap); 531 if ((blob = malloc(len)) == NULL) 532 return SSH_ERR_ALLOC_FAIL; 533 if (bitmap_to_string(bitmap, blob, len) != 0) { 534 free(blob); 535 return SSH_ERR_INTERNAL_ERROR; 536 } 537 r = sshbuf_put_bignum2_bytes(buf, blob, len); 538 free(blob); 539 return r; 540 } 541 542 /* Generate a KRL_SECTION_CERTIFICATES KRL section */ 543 static int 544 revoked_certs_generate(struct revoked_certs *rc, struct sshbuf *buf) 545 { 546 int final, force_new_sect, r = SSH_ERR_INTERNAL_ERROR; 547 u_int64_t i, contig, gap, last = 0, bitmap_start = 0; 548 struct revoked_serial *rs, *nrs; 549 struct revoked_key_id *rki; 550 int next_state, state = 0; 551 struct sshbuf *sect; 552 struct bitmap *bitmap = NULL; 553 554 if ((sect = sshbuf_new()) == NULL) 555 return SSH_ERR_ALLOC_FAIL; 556 557 /* Store the header: optional CA scope key, reserved */ 558 if (rc->ca_key == NULL) { 559 if ((r = sshbuf_put_string(buf, NULL, 0)) != 0) 560 goto out; 561 } else { 562 if ((r = sshkey_puts(rc->ca_key, buf)) != 0) 563 goto out; 564 } 565 if ((r = sshbuf_put_string(buf, NULL, 0)) != 0) 566 goto out; 567 568 /* Store the revoked serials. */ 569 for (rs = RB_MIN(revoked_serial_tree, &rc->revoked_serials); 570 rs != NULL; 571 rs = RB_NEXT(revoked_serial_tree, &rc->revoked_serials, rs)) { 572 KRL_DBG(("%s: serial %llu:%llu state 0x%02x", __func__, 573 (long long unsigned)rs->lo, (long long unsigned)rs->hi, 574 state)); 575 576 /* Check contiguous length and gap to next section (if any) */ 577 nrs = RB_NEXT(revoked_serial_tree, &rc->revoked_serials, rs); 578 final = nrs == NULL; 579 gap = nrs == NULL ? 0 : nrs->lo - rs->hi; 580 contig = 1 + (rs->hi - rs->lo); 581 582 /* Choose next state based on these */ 583 next_state = choose_next_state(state, contig, final, 584 state == 0 ? 0 : rs->lo - last, gap, &force_new_sect); 585 586 /* 587 * If the current section is a range section or has a different 588 * type to the next section, then finish it off now. 589 */ 590 if (state != 0 && (force_new_sect || next_state != state || 591 state == KRL_SECTION_CERT_SERIAL_RANGE)) { 592 KRL_DBG(("%s: finish state 0x%02x", __func__, state)); 593 switch (state) { 594 case KRL_SECTION_CERT_SERIAL_LIST: 595 case KRL_SECTION_CERT_SERIAL_RANGE: 596 break; 597 case KRL_SECTION_CERT_SERIAL_BITMAP: 598 if ((r = put_bitmap(sect, bitmap)) != 0) 599 goto out; 600 bitmap_free(bitmap); 601 bitmap = NULL; 602 break; 603 } 604 if ((r = sshbuf_put_u8(buf, state)) != 0 || 605 (r = sshbuf_put_stringb(buf, sect)) != 0) 606 goto out; 607 sshbuf_reset(sect); 608 } 609 610 /* If we are starting a new section then prepare it now */ 611 if (next_state != state || force_new_sect) { 612 KRL_DBG(("%s: start state 0x%02x", __func__, 613 next_state)); 614 state = next_state; 615 sshbuf_reset(sect); 616 switch (state) { 617 case KRL_SECTION_CERT_SERIAL_LIST: 618 case KRL_SECTION_CERT_SERIAL_RANGE: 619 break; 620 case KRL_SECTION_CERT_SERIAL_BITMAP: 621 if ((bitmap = bitmap_new()) == NULL) { 622 r = SSH_ERR_ALLOC_FAIL; 623 goto out; 624 } 625 bitmap_start = rs->lo; 626 if ((r = sshbuf_put_u64(sect, 627 bitmap_start)) != 0) 628 goto out; 629 break; 630 } 631 } 632 633 /* Perform section-specific processing */ 634 switch (state) { 635 case KRL_SECTION_CERT_SERIAL_LIST: 636 for (i = 0; i < contig; i++) { 637 if ((r = sshbuf_put_u64(sect, rs->lo + i)) != 0) 638 goto out; 639 } 640 break; 641 case KRL_SECTION_CERT_SERIAL_RANGE: 642 if ((r = sshbuf_put_u64(sect, rs->lo)) != 0 || 643 (r = sshbuf_put_u64(sect, rs->hi)) != 0) 644 goto out; 645 break; 646 case KRL_SECTION_CERT_SERIAL_BITMAP: 647 if (rs->lo - bitmap_start > INT_MAX) { 648 error("%s: insane bitmap gap", __func__); 649 goto out; 650 } 651 for (i = 0; i < contig; i++) { 652 if (bitmap_set_bit(bitmap, 653 rs->lo + i - bitmap_start) != 0) { 654 r = SSH_ERR_ALLOC_FAIL; 655 goto out; 656 } 657 } 658 break; 659 } 660 last = rs->hi; 661 } 662 /* Flush the remaining section, if any */ 663 if (state != 0) { 664 KRL_DBG(("%s: serial final flush for state 0x%02x", 665 __func__, state)); 666 switch (state) { 667 case KRL_SECTION_CERT_SERIAL_LIST: 668 case KRL_SECTION_CERT_SERIAL_RANGE: 669 break; 670 case KRL_SECTION_CERT_SERIAL_BITMAP: 671 if ((r = put_bitmap(sect, bitmap)) != 0) 672 goto out; 673 bitmap_free(bitmap); 674 bitmap = NULL; 675 break; 676 } 677 if ((r = sshbuf_put_u8(buf, state)) != 0 || 678 (r = sshbuf_put_stringb(buf, sect)) != 0) 679 goto out; 680 } 681 KRL_DBG(("%s: serial done ", __func__)); 682 683 /* Now output a section for any revocations by key ID */ 684 sshbuf_reset(sect); 685 RB_FOREACH(rki, revoked_key_id_tree, &rc->revoked_key_ids) { 686 KRL_DBG(("%s: key ID %s", __func__, rki->key_id)); 687 if ((r = sshbuf_put_cstring(sect, rki->key_id)) != 0) 688 goto out; 689 } 690 if (sshbuf_len(sect) != 0) { 691 if ((r = sshbuf_put_u8(buf, KRL_SECTION_CERT_KEY_ID)) != 0 || 692 (r = sshbuf_put_stringb(buf, sect)) != 0) 693 goto out; 694 } 695 r = 0; 696 out: 697 bitmap_free(bitmap); 698 sshbuf_free(sect); 699 return r; 700 } 701 702 int 703 ssh_krl_to_blob(struct ssh_krl *krl, struct sshbuf *buf, 704 const struct sshkey **sign_keys, u_int nsign_keys) 705 { 706 int r = SSH_ERR_INTERNAL_ERROR; 707 struct revoked_certs *rc; 708 struct revoked_blob *rb; 709 struct sshbuf *sect; 710 u_char *sblob = NULL; 711 size_t slen, i; 712 713 if (krl->generated_date == 0) 714 krl->generated_date = time(NULL); 715 716 if ((sect = sshbuf_new()) == NULL) 717 return SSH_ERR_ALLOC_FAIL; 718 719 /* Store the header */ 720 if ((r = sshbuf_put(buf, KRL_MAGIC, sizeof(KRL_MAGIC) - 1)) != 0 || 721 (r = sshbuf_put_u32(buf, KRL_FORMAT_VERSION)) != 0 || 722 (r = sshbuf_put_u64(buf, krl->krl_version)) != 0 || 723 (r = sshbuf_put_u64(buf, krl->generated_date)) != 0 || 724 (r = sshbuf_put_u64(buf, krl->flags)) != 0 || 725 (r = sshbuf_put_string(buf, NULL, 0)) != 0 || 726 (r = sshbuf_put_cstring(buf, krl->comment)) != 0) 727 goto out; 728 729 /* Store sections for revoked certificates */ 730 TAILQ_FOREACH(rc, &krl->revoked_certs, entry) { 731 sshbuf_reset(sect); 732 if ((r = revoked_certs_generate(rc, sect)) != 0) 733 goto out; 734 if ((r = sshbuf_put_u8(buf, KRL_SECTION_CERTIFICATES)) != 0 || 735 (r = sshbuf_put_stringb(buf, sect)) != 0) 736 goto out; 737 } 738 739 /* Finally, output sections for revocations by public key/hash */ 740 sshbuf_reset(sect); 741 RB_FOREACH(rb, revoked_blob_tree, &krl->revoked_keys) { 742 KRL_DBG(("%s: key len %zu ", __func__, rb->len)); 743 if ((r = sshbuf_put_string(sect, rb->blob, rb->len)) != 0) 744 goto out; 745 } 746 if (sshbuf_len(sect) != 0) { 747 if ((r = sshbuf_put_u8(buf, KRL_SECTION_EXPLICIT_KEY)) != 0 || 748 (r = sshbuf_put_stringb(buf, sect)) != 0) 749 goto out; 750 } 751 sshbuf_reset(sect); 752 RB_FOREACH(rb, revoked_blob_tree, &krl->revoked_sha1s) { 753 KRL_DBG(("%s: hash len %zu ", __func__, rb->len)); 754 if ((r = sshbuf_put_string(sect, rb->blob, rb->len)) != 0) 755 goto out; 756 } 757 if (sshbuf_len(sect) != 0) { 758 if ((r = sshbuf_put_u8(buf, 759 KRL_SECTION_FINGERPRINT_SHA1)) != 0 || 760 (r = sshbuf_put_stringb(buf, sect)) != 0) 761 goto out; 762 } 763 764 for (i = 0; i < nsign_keys; i++) { 765 KRL_DBG(("%s: signature key %s", __func__, 766 sshkey_ssh_name(sign_keys[i]))); 767 if ((r = sshbuf_put_u8(buf, KRL_SECTION_SIGNATURE)) != 0 || 768 (r = sshkey_puts(sign_keys[i], buf)) != 0) 769 goto out; 770 771 if ((r = sshkey_sign(sign_keys[i], &sblob, &slen, 772 sshbuf_ptr(buf), sshbuf_len(buf), NULL, 0)) != 0) 773 goto out; 774 KRL_DBG(("%s: signature sig len %zu", __func__, slen)); 775 if ((r = sshbuf_put_string(buf, sblob, slen)) != 0) 776 goto out; 777 } 778 779 r = 0; 780 out: 781 free(sblob); 782 sshbuf_free(sect); 783 return r; 784 } 785 786 static void 787 format_timestamp(u_int64_t timestamp, char *ts, size_t nts) 788 { 789 time_t t; 790 struct tm *tm; 791 792 t = timestamp; 793 tm = localtime(&t); 794 if (tm == NULL) 795 strlcpy(ts, "<INVALID>", nts); 796 else { 797 *ts = '\0'; 798 strftime(ts, nts, "%Y%m%dT%H%M%S", tm); 799 } 800 } 801 802 static int 803 parse_revoked_certs(struct sshbuf *buf, struct ssh_krl *krl) 804 { 805 int r = SSH_ERR_INTERNAL_ERROR; 806 u_char type; 807 const u_char *blob; 808 size_t blen, nbits; 809 struct sshbuf *subsect = NULL; 810 u_int64_t serial, serial_lo, serial_hi; 811 struct bitmap *bitmap = NULL; 812 char *key_id = NULL; 813 struct sshkey *ca_key = NULL; 814 815 if ((subsect = sshbuf_new()) == NULL) 816 return SSH_ERR_ALLOC_FAIL; 817 818 /* Header: key, reserved */ 819 if ((r = sshbuf_get_string_direct(buf, &blob, &blen)) != 0 || 820 (r = sshbuf_skip_string(buf)) != 0) 821 goto out; 822 if (blen != 0 && (r = sshkey_from_blob(blob, blen, &ca_key)) != 0) 823 goto out; 824 825 while (sshbuf_len(buf) > 0) { 826 sshbuf_free(subsect); 827 subsect = NULL; 828 if ((r = sshbuf_get_u8(buf, &type)) != 0 || 829 (r = sshbuf_froms(buf, &subsect)) != 0) 830 goto out; 831 KRL_DBG(("%s: subsection type 0x%02x", __func__, type)); 832 /* sshbuf_dump(subsect, stderr); */ 833 834 switch (type) { 835 case KRL_SECTION_CERT_SERIAL_LIST: 836 while (sshbuf_len(subsect) > 0) { 837 if ((r = sshbuf_get_u64(subsect, &serial)) != 0) 838 goto out; 839 if ((r = ssh_krl_revoke_cert_by_serial(krl, 840 ca_key, serial)) != 0) 841 goto out; 842 } 843 break; 844 case KRL_SECTION_CERT_SERIAL_RANGE: 845 if ((r = sshbuf_get_u64(subsect, &serial_lo)) != 0 || 846 (r = sshbuf_get_u64(subsect, &serial_hi)) != 0) 847 goto out; 848 if ((r = ssh_krl_revoke_cert_by_serial_range(krl, 849 ca_key, serial_lo, serial_hi)) != 0) 850 goto out; 851 break; 852 case KRL_SECTION_CERT_SERIAL_BITMAP: 853 if ((bitmap = bitmap_new()) == NULL) { 854 r = SSH_ERR_ALLOC_FAIL; 855 goto out; 856 } 857 if ((r = sshbuf_get_u64(subsect, &serial_lo)) != 0 || 858 (r = sshbuf_get_bignum2_bytes_direct(subsect, 859 &blob, &blen)) != 0) 860 goto out; 861 if (bitmap_from_string(bitmap, blob, blen) != 0) { 862 r = SSH_ERR_INVALID_FORMAT; 863 goto out; 864 } 865 nbits = bitmap_nbits(bitmap); 866 for (serial = 0; serial < (u_int64_t)nbits; serial++) { 867 if (serial > 0 && serial_lo + serial == 0) { 868 error("%s: bitmap wraps u64", __func__); 869 r = SSH_ERR_INVALID_FORMAT; 870 goto out; 871 } 872 if (!bitmap_test_bit(bitmap, serial)) 873 continue; 874 if ((r = ssh_krl_revoke_cert_by_serial(krl, 875 ca_key, serial_lo + serial)) != 0) 876 goto out; 877 } 878 bitmap_free(bitmap); 879 bitmap = NULL; 880 break; 881 case KRL_SECTION_CERT_KEY_ID: 882 while (sshbuf_len(subsect) > 0) { 883 if ((r = sshbuf_get_cstring(subsect, 884 &key_id, NULL)) != 0) 885 goto out; 886 if ((r = ssh_krl_revoke_cert_by_key_id(krl, 887 ca_key, key_id)) != 0) 888 goto out; 889 free(key_id); 890 key_id = NULL; 891 } 892 break; 893 default: 894 error("Unsupported KRL certificate section %u", type); 895 r = SSH_ERR_INVALID_FORMAT; 896 goto out; 897 } 898 if (sshbuf_len(subsect) > 0) { 899 error("KRL certificate section contains unparsed data"); 900 r = SSH_ERR_INVALID_FORMAT; 901 goto out; 902 } 903 } 904 905 r = 0; 906 out: 907 if (bitmap != NULL) 908 bitmap_free(bitmap); 909 free(key_id); 910 sshkey_free(ca_key); 911 sshbuf_free(subsect); 912 return r; 913 } 914 915 916 /* Attempt to parse a KRL, checking its signature (if any) with sign_ca_keys. */ 917 int 918 ssh_krl_from_blob(struct sshbuf *buf, struct ssh_krl **krlp, 919 const struct sshkey **sign_ca_keys, size_t nsign_ca_keys) 920 { 921 struct sshbuf *copy = NULL, *sect = NULL; 922 struct ssh_krl *krl = NULL; 923 char timestamp[64]; 924 int r = SSH_ERR_INTERNAL_ERROR, sig_seen; 925 struct sshkey *key = NULL, **ca_used = NULL, **tmp_ca_used; 926 u_char type, *rdata = NULL; 927 const u_char *blob; 928 size_t i, j, sig_off, sects_off, rlen, blen, nca_used; 929 u_int format_version; 930 931 nca_used = 0; 932 *krlp = NULL; 933 if (sshbuf_len(buf) < sizeof(KRL_MAGIC) - 1 || 934 memcmp(sshbuf_ptr(buf), KRL_MAGIC, sizeof(KRL_MAGIC) - 1) != 0) { 935 debug3("%s: not a KRL", __func__); 936 return SSH_ERR_KRL_BAD_MAGIC; 937 } 938 939 /* Take a copy of the KRL buffer so we can verify its signature later */ 940 if ((copy = sshbuf_fromb(buf)) == NULL) { 941 r = SSH_ERR_ALLOC_FAIL; 942 goto out; 943 } 944 if ((r = sshbuf_consume(copy, sizeof(KRL_MAGIC) - 1)) != 0) 945 goto out; 946 947 if ((krl = ssh_krl_init()) == NULL) { 948 error("%s: alloc failed", __func__); 949 goto out; 950 } 951 952 if ((r = sshbuf_get_u32(copy, &format_version)) != 0) 953 goto out; 954 if (format_version != KRL_FORMAT_VERSION) { 955 r = SSH_ERR_INVALID_FORMAT; 956 goto out; 957 } 958 if ((r = sshbuf_get_u64(copy, &krl->krl_version)) != 0 || 959 (r = sshbuf_get_u64(copy, &krl->generated_date)) != 0 || 960 (r = sshbuf_get_u64(copy, &krl->flags)) != 0 || 961 (r = sshbuf_skip_string(copy)) != 0 || 962 (r = sshbuf_get_cstring(copy, &krl->comment, NULL)) != 0) 963 goto out; 964 965 format_timestamp(krl->generated_date, timestamp, sizeof(timestamp)); 966 debug("KRL version %llu generated at %s%s%s", 967 (long long unsigned)krl->krl_version, timestamp, 968 *krl->comment ? ": " : "", krl->comment); 969 970 /* 971 * 1st pass: verify signatures, if any. This is done to avoid 972 * detailed parsing of data whose provenance is unverified. 973 */ 974 sig_seen = 0; 975 if (sshbuf_len(buf) < sshbuf_len(copy)) { 976 /* Shouldn't happen */ 977 r = SSH_ERR_INTERNAL_ERROR; 978 goto out; 979 } 980 sects_off = sshbuf_len(buf) - sshbuf_len(copy); 981 while (sshbuf_len(copy) > 0) { 982 if ((r = sshbuf_get_u8(copy, &type)) != 0 || 983 (r = sshbuf_get_string_direct(copy, &blob, &blen)) != 0) 984 goto out; 985 KRL_DBG(("%s: first pass, section 0x%02x", __func__, type)); 986 if (type != KRL_SECTION_SIGNATURE) { 987 if (sig_seen) { 988 error("KRL contains non-signature section " 989 "after signature"); 990 r = SSH_ERR_INVALID_FORMAT; 991 goto out; 992 } 993 /* Not interested for now. */ 994 continue; 995 } 996 sig_seen = 1; 997 /* First string component is the signing key */ 998 if ((r = sshkey_from_blob(blob, blen, &key)) != 0) { 999 r = SSH_ERR_INVALID_FORMAT; 1000 goto out; 1001 } 1002 if (sshbuf_len(buf) < sshbuf_len(copy)) { 1003 /* Shouldn't happen */ 1004 r = SSH_ERR_INTERNAL_ERROR; 1005 goto out; 1006 } 1007 sig_off = sshbuf_len(buf) - sshbuf_len(copy); 1008 /* Second string component is the signature itself */ 1009 if ((r = sshbuf_get_string_direct(copy, &blob, &blen)) != 0) { 1010 r = SSH_ERR_INVALID_FORMAT; 1011 goto out; 1012 } 1013 /* Check signature over entire KRL up to this point */ 1014 if ((r = sshkey_verify(key, blob, blen, 1015 sshbuf_ptr(buf), sig_off, NULL, 0)) != 0) 1016 goto out; 1017 /* Check if this key has already signed this KRL */ 1018 for (i = 0; i < nca_used; i++) { 1019 if (sshkey_equal(ca_used[i], key)) { 1020 error("KRL signed more than once with " 1021 "the same key"); 1022 r = SSH_ERR_INVALID_FORMAT; 1023 goto out; 1024 } 1025 } 1026 /* Record keys used to sign the KRL */ 1027 tmp_ca_used = recallocarray(ca_used, nca_used, nca_used + 1, 1028 sizeof(*ca_used)); 1029 if (tmp_ca_used == NULL) { 1030 r = SSH_ERR_ALLOC_FAIL; 1031 goto out; 1032 } 1033 ca_used = tmp_ca_used; 1034 ca_used[nca_used++] = key; 1035 key = NULL; 1036 } 1037 1038 if (sshbuf_len(copy) != 0) { 1039 /* Shouldn't happen */ 1040 r = SSH_ERR_INTERNAL_ERROR; 1041 goto out; 1042 } 1043 1044 /* 1045 * 2nd pass: parse and load the KRL, skipping the header to the point 1046 * where the section start. 1047 */ 1048 sshbuf_free(copy); 1049 if ((copy = sshbuf_fromb(buf)) == NULL) { 1050 r = SSH_ERR_ALLOC_FAIL; 1051 goto out; 1052 } 1053 if ((r = sshbuf_consume(copy, sects_off)) != 0) 1054 goto out; 1055 while (sshbuf_len(copy) > 0) { 1056 sshbuf_free(sect); 1057 sect = NULL; 1058 if ((r = sshbuf_get_u8(copy, &type)) != 0 || 1059 (r = sshbuf_froms(copy, §)) != 0) 1060 goto out; 1061 KRL_DBG(("%s: second pass, section 0x%02x", __func__, type)); 1062 1063 switch (type) { 1064 case KRL_SECTION_CERTIFICATES: 1065 if ((r = parse_revoked_certs(sect, krl)) != 0) 1066 goto out; 1067 break; 1068 case KRL_SECTION_EXPLICIT_KEY: 1069 case KRL_SECTION_FINGERPRINT_SHA1: 1070 while (sshbuf_len(sect) > 0) { 1071 if ((r = sshbuf_get_string(sect, 1072 &rdata, &rlen)) != 0) 1073 goto out; 1074 if (type == KRL_SECTION_FINGERPRINT_SHA1 && 1075 rlen != 20) { 1076 error("%s: bad SHA1 length", __func__); 1077 r = SSH_ERR_INVALID_FORMAT; 1078 goto out; 1079 } 1080 if ((r = revoke_blob( 1081 type == KRL_SECTION_EXPLICIT_KEY ? 1082 &krl->revoked_keys : &krl->revoked_sha1s, 1083 rdata, rlen)) != 0) 1084 goto out; 1085 rdata = NULL; /* revoke_blob frees rdata */ 1086 } 1087 break; 1088 case KRL_SECTION_SIGNATURE: 1089 /* Handled above, but still need to stay in synch */ 1090 sshbuf_free(sect); 1091 sect = NULL; 1092 if ((r = sshbuf_skip_string(copy)) != 0) 1093 goto out; 1094 break; 1095 default: 1096 error("Unsupported KRL section %u", type); 1097 r = SSH_ERR_INVALID_FORMAT; 1098 goto out; 1099 } 1100 if (sect != NULL && sshbuf_len(sect) > 0) { 1101 error("KRL section contains unparsed data"); 1102 r = SSH_ERR_INVALID_FORMAT; 1103 goto out; 1104 } 1105 } 1106 1107 /* Check that the key(s) used to sign the KRL weren't revoked */ 1108 sig_seen = 0; 1109 for (i = 0; i < nca_used; i++) { 1110 if (ssh_krl_check_key(krl, ca_used[i]) == 0) 1111 sig_seen = 1; 1112 else { 1113 sshkey_free(ca_used[i]); 1114 ca_used[i] = NULL; 1115 } 1116 } 1117 if (nca_used && !sig_seen) { 1118 error("All keys used to sign KRL were revoked"); 1119 r = SSH_ERR_KEY_REVOKED; 1120 goto out; 1121 } 1122 1123 /* If we have CA keys, then verify that one was used to sign the KRL */ 1124 if (sig_seen && nsign_ca_keys != 0) { 1125 sig_seen = 0; 1126 for (i = 0; !sig_seen && i < nsign_ca_keys; i++) { 1127 for (j = 0; j < nca_used; j++) { 1128 if (ca_used[j] == NULL) 1129 continue; 1130 if (sshkey_equal(ca_used[j], sign_ca_keys[i])) { 1131 sig_seen = 1; 1132 break; 1133 } 1134 } 1135 } 1136 if (!sig_seen) { 1137 r = SSH_ERR_SIGNATURE_INVALID; 1138 error("KRL not signed with any trusted key"); 1139 goto out; 1140 } 1141 } 1142 1143 *krlp = krl; 1144 r = 0; 1145 out: 1146 if (r != 0) 1147 ssh_krl_free(krl); 1148 for (i = 0; i < nca_used; i++) 1149 sshkey_free(ca_used[i]); 1150 free(ca_used); 1151 free(rdata); 1152 sshkey_free(key); 1153 sshbuf_free(copy); 1154 sshbuf_free(sect); 1155 return r; 1156 } 1157 1158 /* Checks certificate serial number and key ID revocation */ 1159 static int 1160 is_cert_revoked(const struct sshkey *key, struct revoked_certs *rc) 1161 { 1162 struct revoked_serial rs, *ers; 1163 struct revoked_key_id rki, *erki; 1164 1165 /* Check revocation by cert key ID */ 1166 memset(&rki, 0, sizeof(rki)); 1167 rki.key_id = key->cert->key_id; 1168 erki = RB_FIND(revoked_key_id_tree, &rc->revoked_key_ids, &rki); 1169 if (erki != NULL) { 1170 KRL_DBG(("%s: revoked by key ID", __func__)); 1171 return SSH_ERR_KEY_REVOKED; 1172 } 1173 1174 /* 1175 * Zero serials numbers are ignored (it's the default when the 1176 * CA doesn't specify one). 1177 */ 1178 if (key->cert->serial == 0) 1179 return 0; 1180 1181 memset(&rs, 0, sizeof(rs)); 1182 rs.lo = rs.hi = key->cert->serial; 1183 ers = RB_FIND(revoked_serial_tree, &rc->revoked_serials, &rs); 1184 if (ers != NULL) { 1185 KRL_DBG(("%s: revoked serial %llu matched %llu:%llu", __func__, 1186 key->cert->serial, ers->lo, ers->hi)); 1187 return SSH_ERR_KEY_REVOKED; 1188 } 1189 return 0; 1190 } 1191 1192 /* Checks whether a given key/cert is revoked. Does not check its CA */ 1193 static int 1194 is_key_revoked(struct ssh_krl *krl, const struct sshkey *key) 1195 { 1196 struct revoked_blob rb, *erb; 1197 struct revoked_certs *rc; 1198 int r; 1199 1200 /* Check explicitly revoked hashes first */ 1201 memset(&rb, 0, sizeof(rb)); 1202 if ((r = sshkey_fingerprint_raw(key, SSH_DIGEST_SHA1, 1203 &rb.blob, &rb.len)) != 0) 1204 return r; 1205 erb = RB_FIND(revoked_blob_tree, &krl->revoked_sha1s, &rb); 1206 free(rb.blob); 1207 if (erb != NULL) { 1208 KRL_DBG(("%s: revoked by key SHA1", __func__)); 1209 return SSH_ERR_KEY_REVOKED; 1210 } 1211 1212 /* Next, explicit keys */ 1213 memset(&rb, 0, sizeof(rb)); 1214 if ((r = plain_key_blob(key, &rb.blob, &rb.len)) != 0) 1215 return r; 1216 erb = RB_FIND(revoked_blob_tree, &krl->revoked_keys, &rb); 1217 free(rb.blob); 1218 if (erb != NULL) { 1219 KRL_DBG(("%s: revoked by explicit key", __func__)); 1220 return SSH_ERR_KEY_REVOKED; 1221 } 1222 1223 if (!sshkey_is_cert(key)) 1224 return 0; 1225 1226 /* Check cert revocation for the specified CA */ 1227 if ((r = revoked_certs_for_ca_key(krl, key->cert->signature_key, 1228 &rc, 0)) != 0) 1229 return r; 1230 if (rc != NULL) { 1231 if ((r = is_cert_revoked(key, rc)) != 0) 1232 return r; 1233 } 1234 /* Check cert revocation for the wildcard CA */ 1235 if ((r = revoked_certs_for_ca_key(krl, NULL, &rc, 0)) != 0) 1236 return r; 1237 if (rc != NULL) { 1238 if ((r = is_cert_revoked(key, rc)) != 0) 1239 return r; 1240 } 1241 1242 KRL_DBG(("%s: %llu no match", __func__, key->cert->serial)); 1243 return 0; 1244 } 1245 1246 int 1247 ssh_krl_check_key(struct ssh_krl *krl, const struct sshkey *key) 1248 { 1249 int r; 1250 1251 KRL_DBG(("%s: checking key", __func__)); 1252 if ((r = is_key_revoked(krl, key)) != 0) 1253 return r; 1254 if (sshkey_is_cert(key)) { 1255 debug2("%s: checking CA key", __func__); 1256 if ((r = is_key_revoked(krl, key->cert->signature_key)) != 0) 1257 return r; 1258 } 1259 KRL_DBG(("%s: key okay", __func__)); 1260 return 0; 1261 } 1262 1263 int 1264 ssh_krl_file_contains_key(const char *path, const struct sshkey *key) 1265 { 1266 struct sshbuf *krlbuf = NULL; 1267 struct ssh_krl *krl = NULL; 1268 int oerrno = 0, r, fd; 1269 1270 if (path == NULL) 1271 return 0; 1272 1273 if ((krlbuf = sshbuf_new()) == NULL) 1274 return SSH_ERR_ALLOC_FAIL; 1275 if ((fd = open(path, O_RDONLY)) == -1) { 1276 r = SSH_ERR_SYSTEM_ERROR; 1277 oerrno = errno; 1278 goto out; 1279 } 1280 if ((r = sshkey_load_file(fd, krlbuf)) != 0) { 1281 oerrno = errno; 1282 goto out; 1283 } 1284 if ((r = ssh_krl_from_blob(krlbuf, &krl, NULL, 0)) != 0) 1285 goto out; 1286 debug2("%s: checking KRL %s", __func__, path); 1287 r = ssh_krl_check_key(krl, key); 1288 out: 1289 if (fd != -1) 1290 close(fd); 1291 sshbuf_free(krlbuf); 1292 ssh_krl_free(krl); 1293 if (r != 0) 1294 errno = oerrno; 1295 return r; 1296 } 1297