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if_iwm - Factor out firmware station handling into if_iwm_sta.c.
[dragonfly.git] / contrib / ldns / dnssec.c
blob684d17169e2a12b93734859e9e42854d462d0c50
1 /*
2 * dnssec.c
3 *
4 * contains the cryptographic function needed for DNSSEC in ldns
5 * The crypto library used is openssl
6 *
7 * (c) NLnet Labs, 2004-2008
8 *
9 * See the file LICENSE for the license
10 */
11
12 #include <ldns/config.h>
13
14 #include <ldns/ldns.h>
15 #include <ldns/dnssec.h>
16
17 #include <strings.h>
18 #include <time.h>
19
20 #ifdef HAVE_SSL
21 #include <openssl/ssl.h>
22 #include <openssl/evp.h>
23 #include <openssl/rand.h>
24 #include <openssl/err.h>
25 #include <openssl/md5.h>
26 #endif
27
28 ldns_rr *
29 ldns_dnssec_get_rrsig_for_name_and_type(const ldns_rdf *name,
30 const ldns_rr_type type,
31 const ldns_rr_list *rrs)
32 {
33 size_t i;
34 ldns_rr *candidate;
35
36 if (!name || !rrs) {
37 return NULL;
38 }
39
40 for (i = 0; i < ldns_rr_list_rr_count(rrs); i++) {
41 candidate = ldns_rr_list_rr(rrs, i);
42 if (ldns_rr_get_type(candidate) == LDNS_RR_TYPE_RRSIG) {
43 if (ldns_dname_compare(ldns_rr_owner(candidate),
44 name) == 0 &&
45 ldns_rdf2rr_type(ldns_rr_rrsig_typecovered(candidate))
46 == type
47 ) {
48 return candidate;
49 }
50 }
51 }
52
53 return NULL;
54 }
55
56 ldns_rr *
57 ldns_dnssec_get_dnskey_for_rrsig(const ldns_rr *rrsig,
58 const ldns_rr_list *rrs)
59 {
60 size_t i;
61 ldns_rr *candidate;
62
63 if (!rrsig || !rrs) {
64 return NULL;
65 }
66
67 for (i = 0; i < ldns_rr_list_rr_count(rrs); i++) {
68 candidate = ldns_rr_list_rr(rrs, i);
69 if (ldns_rr_get_type(candidate) == LDNS_RR_TYPE_DNSKEY) {
70 if (ldns_dname_compare(ldns_rr_owner(candidate),
71 ldns_rr_rrsig_signame(rrsig)) == 0 &&
72 ldns_rdf2native_int16(ldns_rr_rrsig_keytag(rrsig)) ==
73 ldns_calc_keytag(candidate)
74 ) {
75 return candidate;
76 }
77 }
78 }
79
80 return NULL;
81 }
82
83 ldns_rdf *
84 ldns_nsec_get_bitmap(ldns_rr *nsec) {
85 if (ldns_rr_get_type(nsec) == LDNS_RR_TYPE_NSEC) {
86 return ldns_rr_rdf(nsec, 1);
87 } else if (ldns_rr_get_type(nsec) == LDNS_RR_TYPE_NSEC3) {
88 return ldns_rr_rdf(nsec, 5);
89 } else {
90 return NULL;
91 }
92 }
93
94 /*return the owner name of the closest encloser for name from the list of rrs */
95 /* this is NOT the hash, but the original name! */
96 ldns_rdf *
97 ldns_dnssec_nsec3_closest_encloser(ldns_rdf *qname,
98 ATTR_UNUSED(ldns_rr_type qtype),
99 ldns_rr_list *nsec3s)
100 {
101 /* remember parameters, they must match */
102 uint8_t algorithm;
103 uint32_t iterations;
104 uint8_t salt_length;
105 uint8_t *salt;
106
107 ldns_rdf *sname, *hashed_sname, *tmp;
108 bool flag;
109
110 bool exact_match_found;
111 bool in_range_found;
112
113 ldns_status status;
114 ldns_rdf *zone_name;
115
116 size_t nsec_i;
117 ldns_rr *nsec;
118 ldns_rdf *result = NULL;
119
120 if (!qname || !nsec3s || ldns_rr_list_rr_count(nsec3s) < 1) {
121 return NULL;
122 }
123
124 nsec = ldns_rr_list_rr(nsec3s, 0);
125 algorithm = ldns_nsec3_algorithm(nsec);
126 salt_length = ldns_nsec3_salt_length(nsec);
127 salt = ldns_nsec3_salt_data(nsec);
128 iterations = ldns_nsec3_iterations(nsec);
129
130 sname = ldns_rdf_clone(qname);
131
132 flag = false;
133
134 zone_name = ldns_dname_left_chop(ldns_rr_owner(nsec));
135
136 /* algorithm from nsec3-07 8.3 */
137 while (ldns_dname_label_count(sname) > 0) {
138 exact_match_found = false;
139 in_range_found = false;
140
141 hashed_sname = ldns_nsec3_hash_name(sname,
142 algorithm,
143 iterations,
144 salt_length,
145 salt);
146
147 status = ldns_dname_cat(hashed_sname, zone_name);
148 if(status != LDNS_STATUS_OK) {
149 LDNS_FREE(salt);
150 ldns_rdf_deep_free(zone_name);
151 ldns_rdf_deep_free(sname);
152 return NULL;
153 }
154
155 for (nsec_i = 0; nsec_i < ldns_rr_list_rr_count(nsec3s); nsec_i++) {
156 nsec = ldns_rr_list_rr(nsec3s, nsec_i);
157
158 /* check values of iterations etc! */
159
160 /* exact match? */
161 if (ldns_dname_compare(ldns_rr_owner(nsec), hashed_sname) == 0) {
162 exact_match_found = true;
163 } else if (ldns_nsec_covers_name(nsec, hashed_sname)) {
164 in_range_found = true;
165 }
166
167 }
168 if (!exact_match_found && in_range_found) {
169 flag = true;
170 } else if (exact_match_found && flag) {
171 result = ldns_rdf_clone(sname);
172 /* RFC 5155: 8.3. 2.** "The proof is complete" */
173 ldns_rdf_deep_free(hashed_sname);
174 goto done;
175 } else if (exact_match_found && !flag) {
176 /* error! */
177 ldns_rdf_deep_free(hashed_sname);
178 goto done;
179 } else {
180 flag = false;
181 }
182
183 ldns_rdf_deep_free(hashed_sname);
184 tmp = sname;
185 sname = ldns_dname_left_chop(sname);
186 ldns_rdf_deep_free(tmp);
187 }
188
189 done:
190 LDNS_FREE(salt);
191 ldns_rdf_deep_free(zone_name);
192 ldns_rdf_deep_free(sname);
193
194 return result;
195 }
196
197 bool
198 ldns_dnssec_pkt_has_rrsigs(const ldns_pkt *pkt)
199 {
200 size_t i;
201 for (i = 0; i < ldns_pkt_ancount(pkt); i++) {
202 if (ldns_rr_get_type(ldns_rr_list_rr(ldns_pkt_answer(pkt), i)) ==
203 LDNS_RR_TYPE_RRSIG) {
204 return true;
205 }
206 }
207 for (i = 0; i < ldns_pkt_nscount(pkt); i++) {
208 if (ldns_rr_get_type(ldns_rr_list_rr(ldns_pkt_authority(pkt), i)) ==
209 LDNS_RR_TYPE_RRSIG) {
210 return true;
211 }
212 }
213 return false;
214 }
215
216 ldns_rr_list *
217 ldns_dnssec_pkt_get_rrsigs_for_name_and_type(const ldns_pkt *pkt,
218 ldns_rdf *name,
219 ldns_rr_type type)
220 {
221 uint16_t t_netorder;
222 ldns_rr_list *sigs;
223 ldns_rr_list *sigs_covered;
224 ldns_rdf *rdf_t;
225
226 sigs = ldns_pkt_rr_list_by_name_and_type(pkt,
227 name,
228 LDNS_RR_TYPE_RRSIG,
229 LDNS_SECTION_ANY_NOQUESTION
230 );
231
232 t_netorder = htons(type); /* rdf are in network order! */
233 rdf_t = ldns_rdf_new(LDNS_RDF_TYPE_TYPE, LDNS_RDF_SIZE_WORD, &t_netorder);
234 sigs_covered = ldns_rr_list_subtype_by_rdf(sigs, rdf_t, 0);
235
236 ldns_rdf_free(rdf_t);
237 ldns_rr_list_deep_free(sigs);
238
239 return sigs_covered;
240
241 }
242
243 ldns_rr_list *
244 ldns_dnssec_pkt_get_rrsigs_for_type(const ldns_pkt *pkt, ldns_rr_type type)
245 {
246 uint16_t t_netorder;
247 ldns_rr_list *sigs;
248 ldns_rr_list *sigs_covered;
249 ldns_rdf *rdf_t;
250
251 sigs = ldns_pkt_rr_list_by_type(pkt,
252 LDNS_RR_TYPE_RRSIG,
253 LDNS_SECTION_ANY_NOQUESTION
254 );
255
256 t_netorder = htons(type); /* rdf are in network order! */
257 rdf_t = ldns_rdf_new(LDNS_RDF_TYPE_TYPE,
258 2,
259 &t_netorder);
260 sigs_covered = ldns_rr_list_subtype_by_rdf(sigs, rdf_t, 0);
261
262 ldns_rdf_free(rdf_t);
263 ldns_rr_list_deep_free(sigs);
264
265 return sigs_covered;
266
267 }
268
269 /* used only on the public key RR */
270 uint16_t
271 ldns_calc_keytag(const ldns_rr *key)
272 {
273 uint16_t ac16;
274 ldns_buffer *keybuf;
275 size_t keysize;
276
277 if (!key) {
278 return 0;
279 }
280
281 if (ldns_rr_get_type(key) != LDNS_RR_TYPE_DNSKEY &&
282 ldns_rr_get_type(key) != LDNS_RR_TYPE_KEY
283 ) {
284 return 0;
285 }
286
287 /* rdata to buf - only put the rdata in a buffer */
288 keybuf = ldns_buffer_new(LDNS_MIN_BUFLEN); /* grows */
289 if (!keybuf) {
290 return 0;
291 }
292 (void)ldns_rr_rdata2buffer_wire(keybuf, key);
293 /* the current pos in the buffer is the keysize */
294 keysize= ldns_buffer_position(keybuf);
295
296 ac16 = ldns_calc_keytag_raw(ldns_buffer_begin(keybuf), keysize);
297 ldns_buffer_free(keybuf);
298 return ac16;
299 }
300
301 uint16_t ldns_calc_keytag_raw(uint8_t* key, size_t keysize)
302 {
303 unsigned int i;
304 uint32_t ac32;
305 uint16_t ac16;
306
307 if(keysize < 4) {
308 return 0;
309 }
310 /* look at the algorithm field, copied from 2535bis */
311 if (key[3] == LDNS_RSAMD5) {
312 ac16 = 0;
313 if (keysize > 4) {
314 memmove(&ac16, key + keysize - 3, 2);
315 }
316 ac16 = ntohs(ac16);
317 return (uint16_t) ac16;
318 } else {
319 ac32 = 0;
320 for (i = 0; (size_t)i < keysize; ++i) {
321 ac32 += (i & 1) ? key[i] : key[i] << 8;
322 }
323 ac32 += (ac32 >> 16) & 0xFFFF;
324 return (uint16_t) (ac32 & 0xFFFF);
325 }
326 }
327
328 #ifdef HAVE_SSL
329 DSA *
330 ldns_key_buf2dsa(ldns_buffer *key)
331 {
332 return ldns_key_buf2dsa_raw((unsigned char*)ldns_buffer_begin(key),
333 ldns_buffer_position(key));
334 }
335
336 DSA *
337 ldns_key_buf2dsa_raw(unsigned char* key, size_t len)
338 {
339 uint8_t T;
340 uint16_t length;
341 uint16_t offset;
342 DSA *dsa;
343 BIGNUM *Q; BIGNUM *P;
344 BIGNUM *G; BIGNUM *Y;
345
346 if(len == 0)
347 return NULL;
348 T = (uint8_t)key[0];
349 length = (64 + T * 8);
350 offset = 1;
351
352 if (T > 8) {
353 return NULL;
354 }
355 if(len < (size_t)1 + SHA_DIGEST_LENGTH + 3*length)
356 return NULL;
357
358 Q = BN_bin2bn(key+offset, SHA_DIGEST_LENGTH, NULL);
359 offset += SHA_DIGEST_LENGTH;
360
361 P = BN_bin2bn(key+offset, (int)length, NULL);
362 offset += length;
363
364 G = BN_bin2bn(key+offset, (int)length, NULL);
365 offset += length;
366
367 Y = BN_bin2bn(key+offset, (int)length, NULL);
368 offset += length;
369
370 /* create the key and set its properties */
371 if(!Q || !P || !G || !Y || !(dsa = DSA_new())) {
372 BN_free(Q);
373 BN_free(P);
374 BN_free(G);
375 BN_free(Y);
376 return NULL;
377 }
378 #ifndef S_SPLINT_S
379 dsa->p = P;
380 dsa->q = Q;
381 dsa->g = G;
382 dsa->pub_key = Y;
383 #endif /* splint */
384
385 return dsa;
386 }
387
388 RSA *
389 ldns_key_buf2rsa(ldns_buffer *key)
390 {
391 return ldns_key_buf2rsa_raw((unsigned char*)ldns_buffer_begin(key),
392 ldns_buffer_position(key));
393 }
394
395 RSA *
396 ldns_key_buf2rsa_raw(unsigned char* key, size_t len)
397 {
398 uint16_t offset;
399 uint16_t exp;
400 uint16_t int16;
401 RSA *rsa;
402 BIGNUM *modulus;
403 BIGNUM *exponent;
404
405 if (len == 0)
406 return NULL;
407 if (key[0] == 0) {
408 if(len < 3)
409 return NULL;
410 /* need some smart comment here XXX*/
411 /* the exponent is too large so it's places
412 * futher...???? */
413 memmove(&int16, key+1, 2);
414 exp = ntohs(int16);
415 offset = 3;
416 } else {
417 exp = key[0];
418 offset = 1;
419 }
420
421 /* key length at least one */
422 if(len < (size_t)offset + exp + 1)
423 return NULL;
424
425 /* Exponent */
426 exponent = BN_new();
427 if(!exponent) return NULL;
428 (void) BN_bin2bn(key+offset, (int)exp, exponent);
429 offset += exp;
430
431 /* Modulus */
432 modulus = BN_new();
433 if(!modulus) {
434 BN_free(exponent);
435 return NULL;
436 }
437 /* length of the buffer must match the key length! */
438 (void) BN_bin2bn(key+offset, (int)(len - offset), modulus);
439
440 rsa = RSA_new();
441 if(!rsa) {
442 BN_free(exponent);
443 BN_free(modulus);
444 return NULL;
445 }
446 #ifndef S_SPLINT_S
447 rsa->n = modulus;
448 rsa->e = exponent;
449 #endif /* splint */
450
451 return rsa;
452 }
453
454 int
455 ldns_digest_evp(unsigned char* data, unsigned int len, unsigned char* dest,
456 const EVP_MD* md)
457 {
458 EVP_MD_CTX* ctx;
459 ctx = EVP_MD_CTX_create();
460 if(!ctx)
461 return false;
462 if(!EVP_DigestInit_ex(ctx, md, NULL) ||
463 !EVP_DigestUpdate(ctx, data, len) ||
464 !EVP_DigestFinal_ex(ctx, dest, NULL)) {
465 EVP_MD_CTX_destroy(ctx);
466 return false;
467 }
468 EVP_MD_CTX_destroy(ctx);
469 return true;
470 }
471 #endif /* HAVE_SSL */
472
473 ldns_rr *
474 ldns_key_rr2ds(const ldns_rr *key, ldns_hash h)
475 {
476 ldns_rdf *tmp;
477 ldns_rr *ds;
478 uint16_t keytag;
479 uint8_t sha1hash;
480 uint8_t *digest;
481 ldns_buffer *data_buf;
482 #ifdef USE_GOST
483 const EVP_MD* md = NULL;
484 #endif
485
486 if (ldns_rr_get_type(key) != LDNS_RR_TYPE_DNSKEY) {
487 return NULL;
488 }
489
490 ds = ldns_rr_new();
491 if (!ds) {
492 return NULL;
493 }
494 ldns_rr_set_type(ds, LDNS_RR_TYPE_DS);
495 ldns_rr_set_owner(ds, ldns_rdf_clone(
496 ldns_rr_owner(key)));
497 ldns_rr_set_ttl(ds, ldns_rr_ttl(key));
498 ldns_rr_set_class(ds, ldns_rr_get_class(key));
499
500 switch(h) {
501 default:
502 case LDNS_SHA1:
503 digest = LDNS_XMALLOC(uint8_t, LDNS_SHA1_DIGEST_LENGTH);
504 if (!digest) {
505 ldns_rr_free(ds);
506 return NULL;
507 }
508 break;
509 case LDNS_SHA256:
510 digest = LDNS_XMALLOC(uint8_t, LDNS_SHA256_DIGEST_LENGTH);
511 if (!digest) {
512 ldns_rr_free(ds);
513 return NULL;
514 }
515 break;
516 case LDNS_HASH_GOST:
517 #ifdef USE_GOST
518 (void)ldns_key_EVP_load_gost_id();
519 md = EVP_get_digestbyname("md_gost94");
520 if(!md) {
521 ldns_rr_free(ds);
522 return NULL;
523 }
524 digest = LDNS_XMALLOC(uint8_t, EVP_MD_size(md));
525 if (!digest) {
526 ldns_rr_free(ds);
527 return NULL;
528 }
529 break;
530 #else
531 /* not implemented */
532 ldns_rr_free(ds);
533 return NULL;
534 #endif
535 case LDNS_SHA384:
536 #ifdef USE_ECDSA
537 digest = LDNS_XMALLOC(uint8_t, SHA384_DIGEST_LENGTH);
538 if (!digest) {
539 ldns_rr_free(ds);
540 return NULL;
541 }
542 break;
543 #else
544 /* not implemented */
545 ldns_rr_free(ds);
546 return NULL;
547 #endif
548 }
549
550 data_buf = ldns_buffer_new(LDNS_MAX_PACKETLEN);
551 if (!data_buf) {
552 LDNS_FREE(digest);
553 ldns_rr_free(ds);
554 return NULL;
555 }
556
557 /* keytag */
558 keytag = htons(ldns_calc_keytag((ldns_rr*)key));
559 tmp = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_INT16,
560 sizeof(uint16_t),
561 &keytag);
562 ldns_rr_push_rdf(ds, tmp);
563
564 /* copy the algorithm field */
565 if ((tmp = ldns_rr_rdf(key, 2)) == NULL) {
566 LDNS_FREE(digest);
567 ldns_buffer_free(data_buf);
568 ldns_rr_free(ds);
569 return NULL;
570 } else {
571 ldns_rr_push_rdf(ds, ldns_rdf_clone( tmp ));
572 }
573
574 /* digest hash type */
575 sha1hash = (uint8_t)h;
576 tmp = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_INT8,
577 sizeof(uint8_t),
578 &sha1hash);
579 ldns_rr_push_rdf(ds, tmp);
580
581 /* digest */
582 /* owner name */
583 tmp = ldns_rdf_clone(ldns_rr_owner(key));
584 ldns_dname2canonical(tmp);
585 if (ldns_rdf2buffer_wire(data_buf, tmp) != LDNS_STATUS_OK) {
586 LDNS_FREE(digest);
587 ldns_buffer_free(data_buf);
588 ldns_rr_free(ds);
589 ldns_rdf_deep_free(tmp);
590 return NULL;
591 }
592 ldns_rdf_deep_free(tmp);
593
594 /* all the rdata's */
595 if (ldns_rr_rdata2buffer_wire(data_buf,
596 (ldns_rr*)key) != LDNS_STATUS_OK) {
597 LDNS_FREE(digest);
598 ldns_buffer_free(data_buf);
599 ldns_rr_free(ds);
600 return NULL;
601 }
602 switch(h) {
603 case LDNS_SHA1:
604 (void) ldns_sha1((unsigned char *) ldns_buffer_begin(data_buf),
605 (unsigned int) ldns_buffer_position(data_buf),
606 (unsigned char *) digest);
607
608 tmp = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_HEX,
609 LDNS_SHA1_DIGEST_LENGTH,
610 digest);
611 ldns_rr_push_rdf(ds, tmp);
612
613 break;
614 case LDNS_SHA256:
615 (void) ldns_sha256((unsigned char *) ldns_buffer_begin(data_buf),
616 (unsigned int) ldns_buffer_position(data_buf),
617 (unsigned char *) digest);
618 tmp = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_HEX,
619 LDNS_SHA256_DIGEST_LENGTH,
620 digest);
621 ldns_rr_push_rdf(ds, tmp);
622 break;
623 case LDNS_HASH_GOST:
624 #ifdef USE_GOST
625 if(!ldns_digest_evp((unsigned char *) ldns_buffer_begin(data_buf),
626 (unsigned int) ldns_buffer_position(data_buf),
627 (unsigned char *) digest, md)) {
628 LDNS_FREE(digest);
629 ldns_buffer_free(data_buf);
630 ldns_rr_free(ds);
631 return NULL;
632 }
633 tmp = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_HEX,
634 (size_t)EVP_MD_size(md),
635 digest);
636 ldns_rr_push_rdf(ds, tmp);
637 #endif
638 break;
639 case LDNS_SHA384:
640 #ifdef USE_ECDSA
641 (void) SHA384((unsigned char *) ldns_buffer_begin(data_buf),
642 (unsigned int) ldns_buffer_position(data_buf),
643 (unsigned char *) digest);
644 tmp = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_HEX,
645 SHA384_DIGEST_LENGTH,
646 digest);
647 ldns_rr_push_rdf(ds, tmp);
648 #endif
649 break;
650 }
651
652 LDNS_FREE(digest);
653 ldns_buffer_free(data_buf);
654 return ds;
655 }
656
657 ldns_rdf *
658 ldns_dnssec_create_nsec_bitmap(ldns_rr_type rr_type_list[],
659 size_t size,
660 ldns_rr_type nsec_type)
661 {
662 size_t i;
663 uint8_t *bitmap;
664 uint16_t bm_len = 0;
665 uint16_t i_type;
666 ldns_rdf *bitmap_rdf;
667
668 uint8_t *data = NULL;
669 uint8_t cur_data[32];
670 uint8_t cur_window = 0;
671 uint8_t cur_window_max = 0;
672 uint16_t cur_data_size = 0;
673
674 if (nsec_type != LDNS_RR_TYPE_NSEC &&
675 nsec_type != LDNS_RR_TYPE_NSEC3) {
676 return NULL;
677 }
678
679 i_type = 0;
680 for (i = 0; i < size; i++) {
681 if (i_type < rr_type_list[i])
682 i_type = rr_type_list[i];
683 }
684 if (i_type < nsec_type) {
685 i_type = nsec_type;
686 }
687
688 bm_len = i_type / 8 + 2;
689 bitmap = LDNS_XMALLOC(uint8_t, bm_len);
690 if(!bitmap) return NULL;
691 for (i = 0; i < bm_len; i++) {
692 bitmap[i] = 0;
693 }
694
695 for (i = 0; i < size; i++) {
696 i_type = rr_type_list[i];
697 ldns_set_bit(bitmap + (int) i_type / 8,
698 (int) (7 - (i_type % 8)),
699 true);
700 }
701
702 /* fold it into windows TODO: can this be done directly? */
703 memset(cur_data, 0, 32);
704 for (i = 0; i < bm_len; i++) {
705 if (i / 32 > cur_window) {
706 /* check, copy, new */
707 if (cur_window_max > 0) {
708 /* this window has stuff, add it */
709 data = LDNS_XREALLOC(data,
710 uint8_t,
711 cur_data_size + cur_window_max + 3);
712 if(!data) {
713 LDNS_FREE(bitmap);
714 return NULL;
715 }
716 data[cur_data_size] = cur_window;
717 data[cur_data_size + 1] = cur_window_max + 1;
718 memcpy(data + cur_data_size + 2,
719 cur_data,
720 cur_window_max+1);
721 cur_data_size += cur_window_max + 3;
722 }
723 cur_window++;
724 cur_window_max = 0;
725 memset(cur_data, 0, 32);
726 }
727 cur_data[i%32] = bitmap[i];
728 if (bitmap[i] > 0) {
729 cur_window_max = i%32;
730 }
731 }
732 if (cur_window_max > 0 || cur_data[0] != 0) {
733 /* this window has stuff, add it */
734 data = LDNS_XREALLOC(data,
735 uint8_t,
736 cur_data_size + cur_window_max + 3);
737 if(!data) {
738 LDNS_FREE(bitmap);
739 return NULL;
740 }
741 data[cur_data_size] = cur_window;
742 data[cur_data_size + 1] = cur_window_max + 1;
743 memcpy(data + cur_data_size + 2, cur_data, cur_window_max+1);
744 cur_data_size += cur_window_max + 3;
745 }
746 bitmap_rdf = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_NSEC,
747 cur_data_size,
748 data);
749
750 LDNS_FREE(bitmap);
751 LDNS_FREE(data);
752
753 return bitmap_rdf;
754 }
755
756 int
757 ldns_dnssec_rrsets_contains_type(ldns_dnssec_rrsets *rrsets,
758 ldns_rr_type type)
759 {
760 ldns_dnssec_rrsets *cur_rrset = rrsets;
761 while (cur_rrset) {
762 if (cur_rrset->type == type) {
763 return 1;
764 }
765 cur_rrset = cur_rrset->next;
766 }
767 return 0;
768 }
769
770 ldns_rr *
771 ldns_dnssec_create_nsec(ldns_dnssec_name *from,
772 ldns_dnssec_name *to,
773 ldns_rr_type nsec_type)
774 {
775 ldns_rr *nsec_rr;
776 ldns_rr_type types[65536];
777 size_t type_count = 0;
778 ldns_dnssec_rrsets *cur_rrsets;
779 int on_delegation_point;
780
781 if (!from || !to || (nsec_type != LDNS_RR_TYPE_NSEC)) {
782 return NULL;
783 }
784
785 nsec_rr = ldns_rr_new();
786 ldns_rr_set_type(nsec_rr, nsec_type);
787 ldns_rr_set_owner(nsec_rr, ldns_rdf_clone(ldns_dnssec_name_name(from)));
788 ldns_rr_push_rdf(nsec_rr, ldns_rdf_clone(ldns_dnssec_name_name(to)));
789
790 on_delegation_point = ldns_dnssec_rrsets_contains_type(
791 from->rrsets, LDNS_RR_TYPE_NS)
792 && !ldns_dnssec_rrsets_contains_type(
793 from->rrsets, LDNS_RR_TYPE_SOA);
794
795 cur_rrsets = from->rrsets;
796 while (cur_rrsets) {
797 /* Do not include non-authoritative rrsets on the delegation point
798 * in the type bitmap */
799 if ((on_delegation_point && (
800 cur_rrsets->type == LDNS_RR_TYPE_NS
801 || cur_rrsets->type == LDNS_RR_TYPE_DS))
802 || (!on_delegation_point &&
803 cur_rrsets->type != LDNS_RR_TYPE_RRSIG
804 && cur_rrsets->type != LDNS_RR_TYPE_NSEC)) {
805
806 types[type_count] = cur_rrsets->type;
807 type_count++;
808 }
809 cur_rrsets = cur_rrsets->next;
810
811 }
812 types[type_count] = LDNS_RR_TYPE_RRSIG;
813 type_count++;
814 types[type_count] = LDNS_RR_TYPE_NSEC;
815 type_count++;
816
817 ldns_rr_push_rdf(nsec_rr, ldns_dnssec_create_nsec_bitmap(types,
818 type_count,
819 nsec_type));
820
821 return nsec_rr;
822 }
823
824 ldns_rr *
825 ldns_dnssec_create_nsec3(ldns_dnssec_name *from,
826 ldns_dnssec_name *to,
827 ldns_rdf *zone_name,
828 uint8_t algorithm,
829 uint8_t flags,
830 uint16_t iterations,
831 uint8_t salt_length,
832 uint8_t *salt)
833 {
834 ldns_rr *nsec_rr;
835 ldns_rr_type types[65536];
836 size_t type_count = 0;
837 ldns_dnssec_rrsets *cur_rrsets;
838 ldns_status status;
839 int on_delegation_point;
840
841 if (!from) {
842 return NULL;
843 }
844
845 nsec_rr = ldns_rr_new_frm_type(LDNS_RR_TYPE_NSEC3);
846 ldns_rr_set_owner(nsec_rr,
847 ldns_nsec3_hash_name(ldns_dnssec_name_name(from),
848 algorithm,
849 iterations,
850 salt_length,
851 salt));
852 status = ldns_dname_cat(ldns_rr_owner(nsec_rr), zone_name);
853 if(status != LDNS_STATUS_OK) {
854 ldns_rr_free(nsec_rr);
855 return NULL;
856 }
857 ldns_nsec3_add_param_rdfs(nsec_rr,
858 algorithm,
859 flags,
860 iterations,
861 salt_length,
862 salt);
863
864 on_delegation_point = ldns_dnssec_rrsets_contains_type(
865 from->rrsets, LDNS_RR_TYPE_NS)
866 && !ldns_dnssec_rrsets_contains_type(
867 from->rrsets, LDNS_RR_TYPE_SOA);
868 cur_rrsets = from->rrsets;
869 while (cur_rrsets) {
870 /* Do not include non-authoritative rrsets on the delegation point
871 * in the type bitmap. Potentionally not skipping insecure
872 * delegation should have been done earlier, in function
873 * ldns_dnssec_zone_create_nsec3s, or even earlier in:
874 * ldns_dnssec_zone_sign_nsec3_flg .
875 */
876 if ((on_delegation_point && (
877 cur_rrsets->type == LDNS_RR_TYPE_NS
878 || cur_rrsets->type == LDNS_RR_TYPE_DS))
879 || (!on_delegation_point &&
880 cur_rrsets->type != LDNS_RR_TYPE_RRSIG)) {
881
882 types[type_count] = cur_rrsets->type;
883 type_count++;
884 }
885 cur_rrsets = cur_rrsets->next;
886 }
887 /* always add rrsig type if this is not an unsigned
888 * delegation
889 */
890 if (type_count > 0 &&
891 !(type_count == 1 && types[0] == LDNS_RR_TYPE_NS)) {
892 types[type_count] = LDNS_RR_TYPE_RRSIG;
893 type_count++;
894 }
895
896 /* leave next rdata empty if they weren't precomputed yet */
897 if (to && to->hashed_name) {
898 (void) ldns_rr_set_rdf(nsec_rr,
899 ldns_rdf_clone(to->hashed_name),
900 4);
901 } else {
902 (void) ldns_rr_set_rdf(nsec_rr, NULL, 4);
903 }
904
905 ldns_rr_push_rdf(nsec_rr,
906 ldns_dnssec_create_nsec_bitmap(types,
907 type_count,
908 LDNS_RR_TYPE_NSEC3));
909
910 return nsec_rr;
911 }
912
913 ldns_rr *
914 ldns_create_nsec(ldns_rdf *cur_owner, ldns_rdf *next_owner, ldns_rr_list *rrs)
915 {
916 /* we do not do any check here - garbage in, garbage out */
917
918 /* the the start and end names - get the type from the
919 * before rrlist */
920
921 /* inefficient, just give it a name, a next name, and a list of rrs */
922 /* we make 1 big uberbitmap first, then windows */
923 /* todo: make something more efficient :) */
924 uint16_t i;
925 ldns_rr *i_rr;
926 uint16_t i_type;
927
928 ldns_rr *nsec = NULL;
929 ldns_rr_type i_type_list[65536];
930 size_t type_count = 0;
931
932 nsec = ldns_rr_new();
933 ldns_rr_set_type(nsec, LDNS_RR_TYPE_NSEC);
934 ldns_rr_set_owner(nsec, ldns_rdf_clone(cur_owner));
935 ldns_rr_push_rdf(nsec, ldns_rdf_clone(next_owner));
936
937 for (i = 0; i < ldns_rr_list_rr_count(rrs); i++) {
938 i_rr = ldns_rr_list_rr(rrs, i);
939 if (ldns_rdf_compare(cur_owner,
940 ldns_rr_owner(i_rr)) == 0) {
941 i_type = ldns_rr_get_type(i_rr);
942 if (i_type != LDNS_RR_TYPE_RRSIG && i_type != LDNS_RR_TYPE_NSEC) {
943 if (type_count == 0 || i_type_list[type_count-1] != i_type) {
944 i_type_list[type_count] = i_type;
945 type_count++;
946 }
947 }
948 }
949 }
950
951 i_type_list[type_count] = LDNS_RR_TYPE_RRSIG;
952 type_count++;
953 i_type_list[type_count] = LDNS_RR_TYPE_NSEC;
954 type_count++;
955
956 ldns_rr_push_rdf(nsec,
957 ldns_dnssec_create_nsec_bitmap(i_type_list,
958 type_count, LDNS_RR_TYPE_NSEC));
959
960 return nsec;
961 }
962
963 ldns_rdf *
964 ldns_nsec3_hash_name(ldns_rdf *name,
965 uint8_t algorithm,
966 uint16_t iterations,
967 uint8_t salt_length,
968 uint8_t *salt)
969 {
970 size_t hashed_owner_str_len;
971 ldns_rdf *cann;
972 ldns_rdf *hashed_owner;
973 unsigned char *hashed_owner_str;
974 char *hashed_owner_b32;
975 size_t hashed_owner_b32_len;
976 uint32_t cur_it;
977 /* define to contain the largest possible hash, which is
978 * sha1 at the moment */
979 unsigned char hash[LDNS_SHA1_DIGEST_LENGTH];
980 ldns_status status;
981
982 /* TODO: mnemonic list for hash algs SHA-1, default to 1 now (sha1) */
983 if (algorithm != LDNS_SHA1) {
984 return NULL;
985 }
986
987 /* prepare the owner name according to the draft section bla */
988 cann = ldns_rdf_clone(name);
989 if(!cann) {
990 fprintf(stderr, "Memory error\n");
991 return NULL;
992 }
993 ldns_dname2canonical(cann);
994
995 hashed_owner_str_len = salt_length + ldns_rdf_size(cann);
996 hashed_owner_str = LDNS_XMALLOC(unsigned char, hashed_owner_str_len);
997 if(!hashed_owner_str) {
998 ldns_rdf_deep_free(cann);
999 return NULL;
1000 }
1001 memcpy(hashed_owner_str, ldns_rdf_data(cann), ldns_rdf_size(cann));
1002 memcpy(hashed_owner_str + ldns_rdf_size(cann), salt, salt_length);
1003 ldns_rdf_deep_free(cann);
1004
1005 for (cur_it = iterations + 1; cur_it > 0; cur_it--) {
1006 (void) ldns_sha1((unsigned char *) hashed_owner_str,
1007 (unsigned int) hashed_owner_str_len, hash);
1008
1009 LDNS_FREE(hashed_owner_str);
1010 hashed_owner_str_len = salt_length + LDNS_SHA1_DIGEST_LENGTH;
1011 hashed_owner_str = LDNS_XMALLOC(unsigned char, hashed_owner_str_len);
1012 if (!hashed_owner_str) {
1013 return NULL;
1014 }
1015 memcpy(hashed_owner_str, hash, LDNS_SHA1_DIGEST_LENGTH);
1016 memcpy(hashed_owner_str + LDNS_SHA1_DIGEST_LENGTH, salt, salt_length);
1017 hashed_owner_str_len = LDNS_SHA1_DIGEST_LENGTH + salt_length;
1018 }
1019
1020 LDNS_FREE(hashed_owner_str);
1021 hashed_owner_str = hash;
1022 hashed_owner_str_len = LDNS_SHA1_DIGEST_LENGTH;
1023
1024 hashed_owner_b32 = LDNS_XMALLOC(char,
1025 ldns_b32_ntop_calculate_size(hashed_owner_str_len) + 1);
1026 if(!hashed_owner_b32) {
1027 return NULL;
1028 }
1029 hashed_owner_b32_len = (size_t) ldns_b32_ntop_extended_hex(
1030 (uint8_t *) hashed_owner_str,
1031 hashed_owner_str_len,
1032 hashed_owner_b32,
1033 ldns_b32_ntop_calculate_size(hashed_owner_str_len)+1);
1034 if (hashed_owner_b32_len < 1) {
1035 fprintf(stderr, "Error in base32 extended hex encoding ");
1036 fprintf(stderr, "of hashed owner name (name: ");
1037 ldns_rdf_print(stderr, name);
1038 fprintf(stderr, ", return code: %u)\n",
1039 (unsigned int) hashed_owner_b32_len);
1040 LDNS_FREE(hashed_owner_b32);
1041 return NULL;
1042 }
1043 hashed_owner_b32[hashed_owner_b32_len] = '\0';
1044
1045 status = ldns_str2rdf_dname(&hashed_owner, hashed_owner_b32);
1046 if (status != LDNS_STATUS_OK) {
1047 fprintf(stderr, "Error creating rdf from %s\n", hashed_owner_b32);
1048 LDNS_FREE(hashed_owner_b32);
1049 return NULL;
1050 }
1051
1052 LDNS_FREE(hashed_owner_b32);
1053 return hashed_owner;
1054 }
1055
1056 void
1057 ldns_nsec3_add_param_rdfs(ldns_rr *rr,
1058 uint8_t algorithm,
1059 uint8_t flags,
1060 uint16_t iterations,
1061 uint8_t salt_length,
1062 uint8_t *salt)
1063 {
1064 ldns_rdf *salt_rdf = NULL;
1065 uint8_t *salt_data = NULL;
1066 ldns_rdf *old;
1067
1068 old = ldns_rr_set_rdf(rr,
1069 ldns_rdf_new_frm_data(LDNS_RDF_TYPE_INT8,
1070 1, (void*)&algorithm),
1071 0);
1072 if (old) ldns_rdf_deep_free(old);
1073
1074 old = ldns_rr_set_rdf(rr,
1075 ldns_rdf_new_frm_data(LDNS_RDF_TYPE_INT8,
1076 1, (void*)&flags),
1077 1);
1078 if (old) ldns_rdf_deep_free(old);
1079
1080 old = ldns_rr_set_rdf(rr,
1081 ldns_native2rdf_int16(LDNS_RDF_TYPE_INT16,
1082 iterations),
1083 2);
1084 if (old) ldns_rdf_deep_free(old);
1085
1086 salt_data = LDNS_XMALLOC(uint8_t, salt_length + 1);
1087 if(!salt_data) {
1088 /* no way to return error */
1089 return;
1090 }
1091 salt_data[0] = salt_length;
1092 memcpy(salt_data + 1, salt, salt_length);
1093 salt_rdf = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_NSEC3_SALT,
1094 salt_length + 1,
1095 salt_data);
1096 if(!salt_rdf) {
1097 LDNS_FREE(salt_data);
1098 /* no way to return error */
1099 return;
1100 }
1101
1102 old = ldns_rr_set_rdf(rr, salt_rdf, 3);
1103 if (old) ldns_rdf_deep_free(old);
1104 LDNS_FREE(salt_data);
1105 }
1106
1107 static int
1108 rr_list_delegation_only(ldns_rdf *origin, ldns_rr_list *rr_list)
1109 {
1110 size_t i;
1111 ldns_rr *cur_rr;
1112 if (!origin || !rr_list) return 0;
1113 for (i = 0; i < ldns_rr_list_rr_count(rr_list); i++) {
1114 cur_rr = ldns_rr_list_rr(rr_list, i);
1115 if (ldns_dname_compare(ldns_rr_owner(cur_rr), origin) == 0) {
1116 return 0;
1117 }
1118 if (ldns_rr_get_type(cur_rr) != LDNS_RR_TYPE_NS) {
1119 return 0;
1120 }
1121 }
1122 return 1;
1123 }
1124
1125 /* this will NOT return the NSEC3 completed, you will have to run the
1126 finalize function on the rrlist later! */
1127 ldns_rr *
1128 ldns_create_nsec3(ldns_rdf *cur_owner,
1129 ldns_rdf *cur_zone,
1130 ldns_rr_list *rrs,
1131 uint8_t algorithm,
1132 uint8_t flags,
1133 uint16_t iterations,
1134 uint8_t salt_length,
1135 uint8_t *salt,
1136 bool emptynonterminal)
1137 {
1138 size_t i;
1139 ldns_rr *i_rr;
1140 uint16_t i_type;
1141
1142 ldns_rr *nsec = NULL;
1143 ldns_rdf *hashed_owner = NULL;
1144
1145 ldns_status status;
1146
1147 ldns_rr_type i_type_list[1024];
1148 size_t type_count = 0;
1149
1150 hashed_owner = ldns_nsec3_hash_name(cur_owner,
1151 algorithm,
1152 iterations,
1153 salt_length,
1154 salt);
1155 status = ldns_dname_cat(hashed_owner, cur_zone);
1156 if(status != LDNS_STATUS_OK) {
1157 ldns_rdf_deep_free(hashed_owner);
1158 return NULL;
1159 }
1160 nsec = ldns_rr_new_frm_type(LDNS_RR_TYPE_NSEC3);
1161 if(!nsec) {
1162 ldns_rdf_deep_free(hashed_owner);
1163 return NULL;
1164 }
1165 ldns_rr_set_type(nsec, LDNS_RR_TYPE_NSEC3);
1166 ldns_rr_set_owner(nsec, hashed_owner);
1167
1168 ldns_nsec3_add_param_rdfs(nsec,
1169 algorithm,
1170 flags,
1171 iterations,
1172 salt_length,
1173 salt);
1174 (void) ldns_rr_set_rdf(nsec, NULL, 4);
1175
1176
1177 for (i = 0; i < ldns_rr_list_rr_count(rrs); i++) {
1178 i_rr = ldns_rr_list_rr(rrs, i);
1179 if (ldns_rdf_compare(cur_owner,
1180 ldns_rr_owner(i_rr)) == 0) {
1181 i_type = ldns_rr_get_type(i_rr);
1182 if (type_count == 0 || i_type_list[type_count-1] != i_type) {
1183 i_type_list[type_count] = i_type;
1184 type_count++;
1185 }
1186 }
1187 }
1188
1189 /* add RRSIG anyway, but only if this is not an ENT or
1190 * an unsigned delegation */
1191 if (!emptynonterminal && !rr_list_delegation_only(cur_zone, rrs)) {
1192 i_type_list[type_count] = LDNS_RR_TYPE_RRSIG;
1193 type_count++;
1194 }
1195
1196 /* and SOA if owner == zone */
1197 if (ldns_dname_compare(cur_zone, cur_owner) == 0) {
1198 i_type_list[type_count] = LDNS_RR_TYPE_SOA;
1199 type_count++;
1200 }
1201
1202 ldns_rr_push_rdf(nsec,
1203 ldns_dnssec_create_nsec_bitmap(i_type_list,
1204 type_count, LDNS_RR_TYPE_NSEC3));
1205
1206 return nsec;
1207 }
1208
1209 uint8_t
1210 ldns_nsec3_algorithm(const ldns_rr *nsec3_rr)
1211 {
1212 if (nsec3_rr &&
1213 (ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3 ||
1214 ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3PARAM)
1215 && (ldns_rr_rdf(nsec3_rr, 0) != NULL)
1216 && ldns_rdf_size(ldns_rr_rdf(nsec3_rr, 0)) > 0) {
1217 return ldns_rdf2native_int8(ldns_rr_rdf(nsec3_rr, 0));
1218 }
1219 return 0;
1220 }
1221
1222 uint8_t
1223 ldns_nsec3_flags(const ldns_rr *nsec3_rr)
1224 {
1225 if (nsec3_rr &&
1226 (ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3 ||
1227 ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3PARAM)
1228 && (ldns_rr_rdf(nsec3_rr, 1) != NULL)
1229 && ldns_rdf_size(ldns_rr_rdf(nsec3_rr, 1)) > 0) {
1230 return ldns_rdf2native_int8(ldns_rr_rdf(nsec3_rr, 1));
1231 }
1232 return 0;
1233 }
1234
1235 bool
1236 ldns_nsec3_optout(const ldns_rr *nsec3_rr)
1237 {
1238 return (ldns_nsec3_flags(nsec3_rr) & LDNS_NSEC3_VARS_OPTOUT_MASK);
1239 }
1240
1241 uint16_t
1242 ldns_nsec3_iterations(const ldns_rr *nsec3_rr)
1243 {
1244 if (nsec3_rr &&
1245 (ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3 ||
1246 ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3PARAM)
1247 && (ldns_rr_rdf(nsec3_rr, 2) != NULL)
1248 && ldns_rdf_size(ldns_rr_rdf(nsec3_rr, 2)) > 0) {
1249 return ldns_rdf2native_int16(ldns_rr_rdf(nsec3_rr, 2));
1250 }
1251 return 0;
1252
1253 }
1254
1255 ldns_rdf *
1256 ldns_nsec3_salt(const ldns_rr *nsec3_rr)
1257 {
1258 if (nsec3_rr &&
1259 (ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3 ||
1260 ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3PARAM)
1261 ) {
1262 return ldns_rr_rdf(nsec3_rr, 3);
1263 }
1264 return NULL;
1265 }
1266
1267 uint8_t
1268 ldns_nsec3_salt_length(const ldns_rr *nsec3_rr)
1269 {
1270 ldns_rdf *salt_rdf = ldns_nsec3_salt(nsec3_rr);
1271 if (salt_rdf && ldns_rdf_size(salt_rdf) > 0) {
1272 return (uint8_t) ldns_rdf_data(salt_rdf)[0];
1273 }
1274 return 0;
1275 }
1276
1277 /* allocs data, free with LDNS_FREE() */
1278 uint8_t *
1279 ldns_nsec3_salt_data(const ldns_rr *nsec3_rr)
1280 {
1281 uint8_t salt_length;
1282 uint8_t *salt;
1283
1284 ldns_rdf *salt_rdf = ldns_nsec3_salt(nsec3_rr);
1285 if (salt_rdf && ldns_rdf_size(salt_rdf) > 0) {
1286 salt_length = ldns_rdf_data(salt_rdf)[0];
1287 salt = LDNS_XMALLOC(uint8_t, salt_length);
1288 if(!salt) return NULL;
1289 memcpy(salt, &ldns_rdf_data(salt_rdf)[1], salt_length);
1290 return salt;
1291 }
1292 return NULL;
1293 }
1294
1295 ldns_rdf *
1296 ldns_nsec3_next_owner(const ldns_rr *nsec3_rr)
1297 {
1298 if (!nsec3_rr || ldns_rr_get_type(nsec3_rr) != LDNS_RR_TYPE_NSEC3) {
1299 return NULL;
1300 } else {
1301 return ldns_rr_rdf(nsec3_rr, 4);
1302 }
1303 }
1304
1305 ldns_rdf *
1306 ldns_nsec3_bitmap(const ldns_rr *nsec3_rr)
1307 {
1308 if (!nsec3_rr || ldns_rr_get_type(nsec3_rr) != LDNS_RR_TYPE_NSEC3) {
1309 return NULL;
1310 } else {
1311 return ldns_rr_rdf(nsec3_rr, 5);
1312 }
1313 }
1314
1315 ldns_rdf *
1316 ldns_nsec3_hash_name_frm_nsec3(const ldns_rr *nsec, ldns_rdf *name)
1317 {
1318 uint8_t algorithm;
1319 uint16_t iterations;
1320 uint8_t salt_length;
1321 uint8_t *salt = 0;
1322
1323 ldns_rdf *hashed_owner;
1324
1325 algorithm = ldns_nsec3_algorithm(nsec);
1326 salt_length = ldns_nsec3_salt_length(nsec);
1327 salt = ldns_nsec3_salt_data(nsec);
1328 iterations = ldns_nsec3_iterations(nsec);
1329
1330 hashed_owner = ldns_nsec3_hash_name(name,
1331 algorithm,
1332 iterations,
1333 salt_length,
1334 salt);
1335
1336 LDNS_FREE(salt);
1337 return hashed_owner;
1338 }
1339
1340 bool
1341 ldns_nsec_bitmap_covers_type(const ldns_rdf *nsec_bitmap, ldns_rr_type type)
1342 {
1343 uint8_t window_block_nr;
1344 uint8_t bitmap_length;
1345 uint16_t cur_type;
1346 uint16_t pos = 0;
1347 uint16_t bit_pos;
1348 uint8_t *data;
1349
1350 if (nsec_bitmap == NULL) {
1351 return false;
1352 }
1353 data = ldns_rdf_data(nsec_bitmap);
1354 while(pos < ldns_rdf_size(nsec_bitmap)) {
1355 window_block_nr = data[pos];
1356 bitmap_length = data[pos + 1];
1357 pos += 2;
1358
1359 for (bit_pos = 0; bit_pos < (bitmap_length) * 8; bit_pos++) {
1360 if (ldns_get_bit(&data[pos], bit_pos)) {
1361 cur_type = 256 * (uint16_t) window_block_nr + bit_pos;
1362 if (cur_type == type) {
1363 return true;
1364 }
1365 }
1366 }
1367
1368 pos += (uint16_t) bitmap_length;
1369 }
1370 return false;
1371 }
1372
1373 bool
1374 ldns_nsec_covers_name(const ldns_rr *nsec, const ldns_rdf *name)
1375 {
1376 ldns_rdf *nsec_owner = ldns_rr_owner(nsec);
1377 ldns_rdf *hash_next;
1378 char *next_hash_str;
1379 ldns_rdf *nsec_next = NULL;
1380 ldns_status status;
1381 ldns_rdf *chopped_dname;
1382 bool result;
1383
1384 if (ldns_rr_get_type(nsec) == LDNS_RR_TYPE_NSEC) {
1385 if (ldns_rr_rdf(nsec, 0) != NULL) {
1386 nsec_next = ldns_rdf_clone(ldns_rr_rdf(nsec, 0));
1387 } else {
1388 return false;
1389 }
1390 } else if (ldns_rr_get_type(nsec) == LDNS_RR_TYPE_NSEC3) {
1391 hash_next = ldns_nsec3_next_owner(nsec);
1392 next_hash_str = ldns_rdf2str(hash_next);
1393 nsec_next = ldns_dname_new_frm_str(next_hash_str);
1394 LDNS_FREE(next_hash_str);
1395 chopped_dname = ldns_dname_left_chop(nsec_owner);
1396 status = ldns_dname_cat(nsec_next, chopped_dname);
1397 ldns_rdf_deep_free(chopped_dname);
1398 if (status != LDNS_STATUS_OK) {
1399 printf("error catting: %s\n", ldns_get_errorstr_by_id(status));
1400 }
1401 } else {
1402 ldns_rdf_deep_free(nsec_next);
1403 return false;
1404 }
1405
1406 /* in the case of the last nsec */
1407 if(ldns_dname_compare(nsec_owner, nsec_next) > 0) {
1408 result = (ldns_dname_compare(nsec_owner, name) <= 0 ||
1409 ldns_dname_compare(name, nsec_next) < 0);
1410 } else {
1411 result = (ldns_dname_compare(nsec_owner, name) <= 0 &&
1412 ldns_dname_compare(name, nsec_next) < 0);
1413 }
1414
1415 ldns_rdf_deep_free(nsec_next);
1416 return result;
1417 }
1418
1419 #ifdef HAVE_SSL
1420 /* sig may be null - if so look in the packet */
1421
1422 ldns_status
1423 ldns_pkt_verify_time(ldns_pkt *p, ldns_rr_type t, ldns_rdf *o,
1424 ldns_rr_list *k, ldns_rr_list *s,
1425 time_t check_time, ldns_rr_list *good_keys)
1426 {
1427 ldns_rr_list *rrset;
1428 ldns_rr_list *sigs;
1429 ldns_rr_list *sigs_covered;
1430 ldns_rdf *rdf_t;
1431 ldns_rr_type t_netorder;
1432
1433 if (!k) {
1434 return LDNS_STATUS_ERR;
1435 /* return LDNS_STATUS_CRYPTO_NO_DNSKEY; */
1436 }
1437
1438 if (t == LDNS_RR_TYPE_RRSIG) {
1439 /* we don't have RRSIG(RRSIG) (yet? ;-) ) */
1440 return LDNS_STATUS_ERR;
1441 }
1442
1443 if (s) {
1444 /* if s is not NULL, the sigs are given to use */
1445 sigs = s;
1446 } else {
1447 /* otherwise get them from the packet */
1448 sigs = ldns_pkt_rr_list_by_name_and_type(p, o,
1449 LDNS_RR_TYPE_RRSIG,
1450 LDNS_SECTION_ANY_NOQUESTION);
1451 if (!sigs) {
1452 /* no sigs */
1453 return LDNS_STATUS_ERR;
1454 /* return LDNS_STATUS_CRYPTO_NO_RRSIG; */
1455 }
1456 }
1457
1458 /* rrsig are subtyped, so now we need to find the correct
1459 * sigs for the type t
1460 */
1461 t_netorder = htons(t); /* rdf are in network order! */
1462 /* a type identifier is a 16-bit number, so the size is 2 bytes */
1463 rdf_t = ldns_rdf_new(LDNS_RDF_TYPE_TYPE, 2, &t_netorder);
1464
1465 sigs_covered = ldns_rr_list_subtype_by_rdf(sigs, rdf_t, 0);
1466 ldns_rdf_free(rdf_t);
1467 if (! sigs_covered) {
1468 if (! s) {
1469 ldns_rr_list_deep_free(sigs);
1470 }
1471 return LDNS_STATUS_ERR;
1472 }
1473 ldns_rr_list_deep_free(sigs_covered);
1474
1475 rrset = ldns_pkt_rr_list_by_name_and_type(p, o, t,
1476 LDNS_SECTION_ANY_NOQUESTION);
1477 if (!rrset) {
1478 if (! s) {
1479 ldns_rr_list_deep_free(sigs);
1480 }
1481 return LDNS_STATUS_ERR;
1482 }
1483 return ldns_verify_time(rrset, sigs, k, check_time, good_keys);
1484 }
1485
1486 ldns_status
1487 ldns_pkt_verify(ldns_pkt *p, ldns_rr_type t, ldns_rdf *o,
1488 ldns_rr_list *k, ldns_rr_list *s, ldns_rr_list *good_keys)
1489 {
1490 return ldns_pkt_verify_time(p, t, o, k, s, ldns_time(NULL), good_keys);
1491 }
1492 #endif /* HAVE_SSL */
1493
1494 ldns_status
1495 ldns_dnssec_chain_nsec3_list(ldns_rr_list *nsec3_rrs)
1496 {
1497 size_t i;
1498 char *next_nsec_owner_str;
1499 ldns_rdf *next_nsec_owner_label;
1500 ldns_rdf *next_nsec_rdf;
1501 ldns_status status = LDNS_STATUS_OK;
1502
1503 for (i = 0; i < ldns_rr_list_rr_count(nsec3_rrs); i++) {
1504 if (i == ldns_rr_list_rr_count(nsec3_rrs) - 1) {
1505 next_nsec_owner_label =
1506 ldns_dname_label(ldns_rr_owner(ldns_rr_list_rr(nsec3_rrs,
1507 0)), 0);
1508 next_nsec_owner_str = ldns_rdf2str(next_nsec_owner_label);
1509 if (next_nsec_owner_str[strlen(next_nsec_owner_str) - 1]
1510 == '.') {
1511 next_nsec_owner_str[strlen(next_nsec_owner_str) - 1]
1512 = '\0';
1513 }
1514 status = ldns_str2rdf_b32_ext(&next_nsec_rdf,
1515 next_nsec_owner_str);
1516 if (!ldns_rr_set_rdf(ldns_rr_list_rr(nsec3_rrs, i),
1517 next_nsec_rdf, 4)) {
1518 /* todo: error */
1519 }
1520
1521 ldns_rdf_deep_free(next_nsec_owner_label);
1522 LDNS_FREE(next_nsec_owner_str);
1523 } else {
1524 next_nsec_owner_label =
1525 ldns_dname_label(ldns_rr_owner(ldns_rr_list_rr(nsec3_rrs,
1526 i + 1)),
1527 0);
1528 next_nsec_owner_str = ldns_rdf2str(next_nsec_owner_label);
1529 if (next_nsec_owner_str[strlen(next_nsec_owner_str) - 1]
1530 == '.') {
1531 next_nsec_owner_str[strlen(next_nsec_owner_str) - 1]
1532 = '\0';
1533 }
1534 status = ldns_str2rdf_b32_ext(&next_nsec_rdf,
1535 next_nsec_owner_str);
1536 ldns_rdf_deep_free(next_nsec_owner_label);
1537 LDNS_FREE(next_nsec_owner_str);
1538 if (!ldns_rr_set_rdf(ldns_rr_list_rr(nsec3_rrs, i),
1539 next_nsec_rdf, 4)) {
1540 /* todo: error */
1541 }
1542 }
1543 }
1544 return status;
1545 }
1546
1547 int
1548 qsort_rr_compare_nsec3(const void *a, const void *b)
1549 {
1550 const ldns_rr *rr1 = * (const ldns_rr **) a;
1551 const ldns_rr *rr2 = * (const ldns_rr **) b;
1552 if (rr1 == NULL && rr2 == NULL) {
1553 return 0;
1554 }
1555 if (rr1 == NULL) {
1556 return -1;
1557 }
1558 if (rr2 == NULL) {
1559 return 1;
1560 }
1561 return ldns_rdf_compare(ldns_rr_owner(rr1), ldns_rr_owner(rr2));
1562 }
1563
1564 void
1565 ldns_rr_list_sort_nsec3(ldns_rr_list *unsorted)
1566 {
1567 qsort(unsorted->_rrs,
1568 ldns_rr_list_rr_count(unsorted),
1569 sizeof(ldns_rr *),
1570 qsort_rr_compare_nsec3);
1571 }
1572
1573 int
1574 ldns_dnssec_default_add_to_signatures( ATTR_UNUSED(ldns_rr *sig)
1575 , ATTR_UNUSED(void *n)
1576 )
1577 {
1578 return LDNS_SIGNATURE_LEAVE_ADD_NEW;
1579 }
1580
1581 int
1582 ldns_dnssec_default_leave_signatures( ATTR_UNUSED(ldns_rr *sig)
1583 , ATTR_UNUSED(void *n)
1584 )
1585 {
1586 return LDNS_SIGNATURE_LEAVE_NO_ADD;
1587 }
1588
1589 int
1590 ldns_dnssec_default_delete_signatures( ATTR_UNUSED(ldns_rr *sig)
1591 , ATTR_UNUSED(void *n)
1592 )
1593 {
1594 return LDNS_SIGNATURE_REMOVE_NO_ADD;
1595 }
1596
1597 int
1598 ldns_dnssec_default_replace_signatures( ATTR_UNUSED(ldns_rr *sig)
1599 , ATTR_UNUSED(void *n)
1600 )
1601 {
1602 return LDNS_SIGNATURE_REMOVE_ADD_NEW;
1603 }
1604
1605 #ifdef HAVE_SSL
1606 ldns_rdf *
1607 ldns_convert_dsa_rrsig_asn12rdf(const ldns_buffer *sig,
1608 const long sig_len)
1609 {
1610 ldns_rdf *sigdata_rdf;
1611 DSA_SIG *dsasig;
1612 unsigned char *dsasig_data = (unsigned char*)ldns_buffer_begin(sig);
1613 size_t byte_offset;
1614
1615 dsasig = d2i_DSA_SIG(NULL,
1616 (const unsigned char **)&dsasig_data,
1617 sig_len);
1618 if (!dsasig) {
1619 DSA_SIG_free(dsasig);
1620 return NULL;
1621 }
1622
1623 dsasig_data = LDNS_XMALLOC(unsigned char, 41);
1624 if(!dsasig_data) {
1625 DSA_SIG_free(dsasig);
1626 return NULL;
1627 }
1628 dsasig_data[0] = 0;
1629 byte_offset = (size_t) (20 - BN_num_bytes(dsasig->r));
1630 if (byte_offset > 20) {
1631 DSA_SIG_free(dsasig);
1632 LDNS_FREE(dsasig_data);
1633 return NULL;
1634 }
1635 memset(&dsasig_data[1], 0, byte_offset);
1636 BN_bn2bin(dsasig->r, &dsasig_data[1 + byte_offset]);
1637 byte_offset = (size_t) (20 - BN_num_bytes(dsasig->s));
1638 if (byte_offset > 20) {
1639 DSA_SIG_free(dsasig);
1640 LDNS_FREE(dsasig_data);
1641 return NULL;
1642 }
1643 memset(&dsasig_data[21], 0, byte_offset);
1644 BN_bn2bin(dsasig->s, &dsasig_data[21 + byte_offset]);
1645
1646 sigdata_rdf = ldns_rdf_new(LDNS_RDF_TYPE_B64, 41, dsasig_data);
1647 if(!sigdata_rdf) {
1648 LDNS_FREE(dsasig_data);
1649 }
1650 DSA_SIG_free(dsasig);
1651
1652 return sigdata_rdf;
1653 }
1654
1655 ldns_status
1656 ldns_convert_dsa_rrsig_rdf2asn1(ldns_buffer *target_buffer,
1657 const ldns_rdf *sig_rdf)
1658 {
1659 /* the EVP api wants the DER encoding of the signature... */
1660 BIGNUM *R, *S;
1661 DSA_SIG *dsasig;
1662 unsigned char *raw_sig = NULL;
1663 int raw_sig_len;
1664
1665 if(ldns_rdf_size(sig_rdf) < 1 + 2*SHA_DIGEST_LENGTH)
1666 return LDNS_STATUS_SYNTAX_RDATA_ERR;
1667 /* extract the R and S field from the sig buffer */
1668 R = BN_new();
1669 if(!R) return LDNS_STATUS_MEM_ERR;
1670 (void) BN_bin2bn((unsigned char *) ldns_rdf_data(sig_rdf) + 1,
1671 SHA_DIGEST_LENGTH, R);
1672 S = BN_new();
1673 if(!S) {
1674 BN_free(R);
1675 return LDNS_STATUS_MEM_ERR;
1676 }
1677 (void) BN_bin2bn((unsigned char *) ldns_rdf_data(sig_rdf) + 21,
1678 SHA_DIGEST_LENGTH, S);
1679
1680 dsasig = DSA_SIG_new();
1681 if (!dsasig) {
1682 BN_free(R);
1683 BN_free(S);
1684 return LDNS_STATUS_MEM_ERR;
1685 }
1686
1687 dsasig->r = R;
1688 dsasig->s = S;
1689
1690 raw_sig_len = i2d_DSA_SIG(dsasig, &raw_sig);
1691 if (raw_sig_len < 0) {
1692 DSA_SIG_free(dsasig);
1693 free(raw_sig);
1694 return LDNS_STATUS_SSL_ERR;
1695 }
1696 if (ldns_buffer_reserve(target_buffer, (size_t) raw_sig_len)) {
1697 ldns_buffer_write(target_buffer, raw_sig, (size_t)raw_sig_len);
1698 }
1699
1700 DSA_SIG_free(dsasig);
1701 free(raw_sig);
1702
1703 return ldns_buffer_status(target_buffer);
1704 }
1705
1706 #ifdef USE_ECDSA
1707 #ifndef S_SPLINT_S
1708 ldns_rdf *
1709 ldns_convert_ecdsa_rrsig_asn12rdf(const ldns_buffer *sig, const long sig_len)
1710 {
1711 ECDSA_SIG* ecdsa_sig;
1712 unsigned char *data = (unsigned char*)ldns_buffer_begin(sig);
1713 ldns_rdf* rdf;
1714 ecdsa_sig = d2i_ECDSA_SIG(NULL, (const unsigned char **)&data, sig_len);
1715 if(!ecdsa_sig) return NULL;
1716
1717 /* "r | s". */
1718 data = LDNS_XMALLOC(unsigned char,
1719 BN_num_bytes(ecdsa_sig->r) + BN_num_bytes(ecdsa_sig->s));
1720 if(!data) {
1721 ECDSA_SIG_free(ecdsa_sig);
1722 return NULL;
1723 }
1724 BN_bn2bin(ecdsa_sig->r, data);
1725 BN_bn2bin(ecdsa_sig->s, data+BN_num_bytes(ecdsa_sig->r));
1726 rdf = ldns_rdf_new(LDNS_RDF_TYPE_B64, (size_t)(
1727 BN_num_bytes(ecdsa_sig->r) + BN_num_bytes(ecdsa_sig->s)), data);
1728 ECDSA_SIG_free(ecdsa_sig);
1729 return rdf;
1730 }
1731
1732 ldns_status
1733 ldns_convert_ecdsa_rrsig_rdf2asn1(ldns_buffer *target_buffer,
1734 const ldns_rdf *sig_rdf)
1735 {
1736 ECDSA_SIG* sig;
1737 int raw_sig_len;
1738 long bnsize = (long)ldns_rdf_size(sig_rdf) / 2;
1739 /* if too short, or not even length, do not bother */
1740 if(bnsize < 16 || (size_t)bnsize*2 != ldns_rdf_size(sig_rdf))
1741 return LDNS_STATUS_ERR;
1742
1743 /* use the raw data to parse two evenly long BIGNUMs, "r | s". */
1744 sig = ECDSA_SIG_new();
1745 if(!sig) return LDNS_STATUS_MEM_ERR;
1746 sig->r = BN_bin2bn((const unsigned char*)ldns_rdf_data(sig_rdf),
1747 bnsize, sig->r);
1748 sig->s = BN_bin2bn((const unsigned char*)ldns_rdf_data(sig_rdf)+bnsize,
1749 bnsize, sig->s);
1750 if(!sig->r || !sig->s) {
1751 ECDSA_SIG_free(sig);
1752 return LDNS_STATUS_MEM_ERR;
1753 }
1754
1755 raw_sig_len = i2d_ECDSA_SIG(sig, NULL);
1756 if (ldns_buffer_reserve(target_buffer, (size_t) raw_sig_len)) {
1757 unsigned char* pp = (unsigned char*)
1758 ldns_buffer_current(target_buffer);
1759 raw_sig_len = i2d_ECDSA_SIG(sig, &pp);
1760 ldns_buffer_skip(target_buffer, (ssize_t) raw_sig_len);
1761 }
1762 ECDSA_SIG_free(sig);
1763
1764 return ldns_buffer_status(target_buffer);
1765 }
1766
1767 #endif /* S_SPLINT_S */
1768 #endif /* USE_ECDSA */
1769 #endif /* HAVE_SSL */
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