dnssec.c
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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 #include <openssl/bn.h>
27 #include <openssl/rsa.h>
28 #ifdef USE_DSA
29 #include <openssl/dsa.h>
30 #endif
31 #endif
32 
33 ldns_rr *
34 ldns_dnssec_get_rrsig_for_name_and_type(const ldns_rdf *name,
35  const ldns_rr_type type,
36  const ldns_rr_list *rrs)
37 {
38  size_t i;
39  ldns_rr *candidate;
40 
41  if (!name || !rrs) {
42  return NULL;
43  }
44 
45  for (i = 0; i < ldns_rr_list_rr_count(rrs); i++) {
46  candidate = ldns_rr_list_rr(rrs, i);
47  if (ldns_rr_get_type(candidate) == LDNS_RR_TYPE_RRSIG) {
48  if (ldns_dname_compare(ldns_rr_owner(candidate),
49  name) == 0 &&
50  ldns_rdf2rr_type(ldns_rr_rrsig_typecovered(candidate))
51  == type
52  ) {
53  return candidate;
54  }
55  }
56  }
57 
58  return NULL;
59 }
60 
61 ldns_rr *
62 ldns_dnssec_get_dnskey_for_rrsig(const ldns_rr *rrsig,
63  const ldns_rr_list *rrs)
64 {
65  size_t i;
66  ldns_rr *candidate;
67 
68  if (!rrsig || !rrs) {
69  return NULL;
70  }
71 
72  for (i = 0; i < ldns_rr_list_rr_count(rrs); i++) {
73  candidate = ldns_rr_list_rr(rrs, i);
74  if (ldns_rr_get_type(candidate) == LDNS_RR_TYPE_DNSKEY) {
75  if (ldns_dname_compare(ldns_rr_owner(candidate),
76  ldns_rr_rrsig_signame(rrsig)) == 0 &&
77  ldns_rdf2native_int16(ldns_rr_rrsig_keytag(rrsig)) ==
78  ldns_calc_keytag(candidate)
79  ) {
80  return candidate;
81  }
82  }
83  }
84 
85  return NULL;
86 }
87 
88 ldns_rdf *
89 ldns_nsec_get_bitmap(const ldns_rr *nsec) {
90  if (ldns_rr_get_type(nsec) == LDNS_RR_TYPE_NSEC) {
91  return ldns_rr_rdf(nsec, 1);
92  } else if (ldns_rr_get_type(nsec) == LDNS_RR_TYPE_NSEC3) {
93  return ldns_rr_rdf(nsec, 5);
94  } else {
95  return NULL;
96  }
97 }
98 
99 /*return the owner name of the closest encloser for name from the list of rrs */
100 /* this is NOT the hash, but the original name! */
101 ldns_rdf *
102 ldns_dnssec_nsec3_closest_encloser(const ldns_rdf *qname,
103  ATTR_UNUSED(ldns_rr_type qtype),
104  const ldns_rr_list *nsec3s)
105 {
106  /* remember parameters, they must match */
107  uint8_t algorithm;
108  uint32_t iterations;
109  uint8_t salt_length;
110  uint8_t *salt;
111 
112  ldns_rdf *sname, *hashed_sname, *tmp;
113  bool flag;
114 
115  bool exact_match_found;
116  bool in_range_found;
117 
118  ldns_status status;
119  ldns_rdf *zone_name;
120 
121  size_t nsec_i;
122  ldns_rr *nsec;
123  ldns_rdf *result = NULL;
124 
125  if (!qname || !nsec3s || ldns_rr_list_rr_count(nsec3s) < 1) {
126  return NULL;
127  }
128 
129  nsec = ldns_rr_list_rr(nsec3s, 0);
130  algorithm = ldns_nsec3_algorithm(nsec);
131  salt_length = ldns_nsec3_salt_length(nsec);
132  salt = ldns_nsec3_salt_data(nsec);
133  iterations = ldns_nsec3_iterations(nsec);
134 
135  sname = ldns_rdf_clone(qname);
136 
137  flag = false;
138 
139  zone_name = ldns_dname_left_chop(ldns_rr_owner(nsec));
140 
141  /* algorithm from nsec3-07 8.3 */
142  while (ldns_dname_label_count(sname) > 0) {
143  exact_match_found = false;
144  in_range_found = false;
145 
146  hashed_sname = ldns_nsec3_hash_name(sname,
147  algorithm,
148  iterations,
149  salt_length,
150  salt);
151 
152  status = ldns_dname_cat(hashed_sname, zone_name);
153  if(status != LDNS_STATUS_OK) {
154  LDNS_FREE(salt);
155  ldns_rdf_deep_free(zone_name);
156  ldns_rdf_deep_free(sname);
157  ldns_rdf_deep_free(hashed_sname);
158  return NULL;
159  }
160 
161  for (nsec_i = 0; nsec_i < ldns_rr_list_rr_count(nsec3s); nsec_i++) {
162  nsec = ldns_rr_list_rr(nsec3s, nsec_i);
163 
164  /* check values of iterations etc! */
165 
166  /* exact match? */
167  if (ldns_dname_compare(ldns_rr_owner(nsec), hashed_sname) == 0) {
168  exact_match_found = true;
169  } else if (ldns_nsec_covers_name(nsec, hashed_sname)) {
170  in_range_found = true;
171  }
172 
173  }
174  if (!exact_match_found && in_range_found) {
175  flag = true;
176  } else if (exact_match_found && flag) {
177  result = ldns_rdf_clone(sname);
178  /* RFC 5155: 8.3. 2.** "The proof is complete" */
179  ldns_rdf_deep_free(hashed_sname);
180  goto done;
181  } else if (exact_match_found && !flag) {
182  /* error! */
183  ldns_rdf_deep_free(hashed_sname);
184  goto done;
185  } else {
186  flag = false;
187  }
188 
189  ldns_rdf_deep_free(hashed_sname);
190  tmp = sname;
191  sname = ldns_dname_left_chop(sname);
192  ldns_rdf_deep_free(tmp);
193  }
194 
195  done:
196  LDNS_FREE(salt);
197  ldns_rdf_deep_free(zone_name);
198  ldns_rdf_deep_free(sname);
199 
200  return result;
201 }
202 
203 bool
204 ldns_dnssec_pkt_has_rrsigs(const ldns_pkt *pkt)
205 {
206  size_t i;
207  for (i = 0; i < ldns_pkt_ancount(pkt); i++) {
208  if (ldns_rr_get_type(ldns_rr_list_rr(ldns_pkt_answer(pkt), i)) ==
209  LDNS_RR_TYPE_RRSIG) {
210  return true;
211  }
212  }
213  for (i = 0; i < ldns_pkt_nscount(pkt); i++) {
214  if (ldns_rr_get_type(ldns_rr_list_rr(ldns_pkt_authority(pkt), i)) ==
215  LDNS_RR_TYPE_RRSIG) {
216  return true;
217  }
218  }
219  return false;
220 }
221 
222 ldns_rr_list *
223 ldns_dnssec_pkt_get_rrsigs_for_name_and_type(const ldns_pkt *pkt,
224  const ldns_rdf *name,
225  ldns_rr_type type)
226 {
227  uint16_t t_netorder;
228  ldns_rr_list *sigs;
229  ldns_rr_list *sigs_covered;
230  ldns_rdf *rdf_t;
231 
232  sigs = ldns_pkt_rr_list_by_name_and_type(pkt,
233  name,
234  LDNS_RR_TYPE_RRSIG,
235  LDNS_SECTION_ANY_NOQUESTION
236  );
237 
238  t_netorder = htons(type); /* rdf are in network order! */
239  rdf_t = ldns_rdf_new(LDNS_RDF_TYPE_TYPE, LDNS_RDF_SIZE_WORD, &t_netorder);
240  sigs_covered = ldns_rr_list_subtype_by_rdf(sigs, rdf_t, 0);
241 
242  ldns_rdf_free(rdf_t);
243  ldns_rr_list_deep_free(sigs);
244 
245  return sigs_covered;
246 
247 }
248 
249 ldns_rr_list *
250 ldns_dnssec_pkt_get_rrsigs_for_type(const ldns_pkt *pkt, ldns_rr_type type)
251 {
252  uint16_t t_netorder;
253  ldns_rr_list *sigs;
254  ldns_rr_list *sigs_covered;
255  ldns_rdf *rdf_t;
256 
257  sigs = ldns_pkt_rr_list_by_type(pkt,
258  LDNS_RR_TYPE_RRSIG,
259  LDNS_SECTION_ANY_NOQUESTION
260  );
261 
262  t_netorder = htons(type); /* rdf are in network order! */
263  rdf_t = ldns_rdf_new(LDNS_RDF_TYPE_TYPE,
264  2,
265  &t_netorder);
266  sigs_covered = ldns_rr_list_subtype_by_rdf(sigs, rdf_t, 0);
267 
268  ldns_rdf_free(rdf_t);
269  ldns_rr_list_deep_free(sigs);
270 
271  return sigs_covered;
272 
273 }
274 
275 /* used only on the public key RR */
276 uint16_t
277 ldns_calc_keytag(const ldns_rr *key)
278 {
279  uint16_t ac16;
280  ldns_buffer *keybuf;
281  size_t keysize;
282 
283  if (!key) {
284  return 0;
285  }
286 
287  if (ldns_rr_get_type(key) != LDNS_RR_TYPE_DNSKEY &&
288  ldns_rr_get_type(key) != LDNS_RR_TYPE_KEY
289  ) {
290  return 0;
291  }
292 
293  /* rdata to buf - only put the rdata in a buffer */
294  keybuf = ldns_buffer_new(LDNS_MIN_BUFLEN); /* grows */
295  if (!keybuf) {
296  return 0;
297  }
298  (void)ldns_rr_rdata2buffer_wire(keybuf, key);
299  /* the current pos in the buffer is the keysize */
300  keysize= ldns_buffer_position(keybuf);
301 
302  ac16 = ldns_calc_keytag_raw(ldns_buffer_begin(keybuf), keysize);
303  ldns_buffer_free(keybuf);
304  return ac16;
305 }
306 
307 uint16_t ldns_calc_keytag_raw(const uint8_t* key, size_t keysize)
308 {
309  unsigned int i;
310  uint32_t ac32;
311  uint16_t ac16;
312 
313  if(keysize < 4) {
314  return 0;
315  }
316  /* look at the algorithm field, copied from 2535bis */
317  if (key[3] == LDNS_RSAMD5) {
318  ac16 = 0;
319  if (keysize > 4) {
320  memmove(&ac16, key + keysize - 3, 2);
321  }
322  ac16 = ntohs(ac16);
323  return (uint16_t) ac16;
324  } else {
325  ac32 = 0;
326  for (i = 0; (size_t)i < keysize; ++i) {
327  ac32 += (i & 1) ? key[i] : key[i] << 8;
328  }
329  ac32 += (ac32 >> 16) & 0xFFFF;
330  return (uint16_t) (ac32 & 0xFFFF);
331  }
332 }
333 
334 #ifdef HAVE_SSL
335 #ifdef USE_DSA
336 DSA *
337 ldns_key_buf2dsa(const ldns_buffer *key)
338 {
339  return ldns_key_buf2dsa_raw((const unsigned char*)ldns_buffer_begin(key),
340  ldns_buffer_position(key));
341 }
342 
343 DSA *
344 ldns_key_buf2dsa_raw(const unsigned char* key, size_t len)
345 {
346  uint8_t T;
347  uint16_t length;
348  uint16_t offset;
349  DSA *dsa;
350  BIGNUM *Q; BIGNUM *P;
351  BIGNUM *G; BIGNUM *Y;
352 
353  if(len == 0)
354  return NULL;
355  T = (uint8_t)key[0];
356  length = (64 + T * 8);
357  offset = 1;
358 
359  if (T > 8) {
360  return NULL;
361  }
362  if(len < (size_t)1 + SHA_DIGEST_LENGTH + 3*length)
363  return NULL;
364 
365  Q = BN_bin2bn(key+offset, SHA_DIGEST_LENGTH, NULL);
366  offset += SHA_DIGEST_LENGTH;
367 
368  P = BN_bin2bn(key+offset, (int)length, NULL);
369  offset += length;
370 
371  G = BN_bin2bn(key+offset, (int)length, NULL);
372  offset += length;
373 
374  Y = BN_bin2bn(key+offset, (int)length, NULL);
375 
376  /* create the key and set its properties */
377  if(!Q || !P || !G || !Y || !(dsa = DSA_new())) {
378  BN_free(Q);
379  BN_free(P);
380  BN_free(G);
381  BN_free(Y);
382  return NULL;
383  }
384 #if OPENSSL_VERSION_NUMBER < 0x10100000 || (defined(HAVE_LIBRESSL) && LIBRESSL_VERSION_NUMBER < 0x20700000)
385 #ifndef S_SPLINT_S
386  dsa->p = P;
387  dsa->q = Q;
388  dsa->g = G;
389  dsa->pub_key = Y;
390 #endif /* splint */
391 #else /* OPENSSL_VERSION_NUMBER */
392  if (!DSA_set0_pqg(dsa, P, Q, G)) {
393  /* QPG not yet attached, need to free */
394  BN_free(Q);
395  BN_free(P);
396  BN_free(G);
397 
398  DSA_free(dsa);
399  BN_free(Y);
400  return NULL;
401  }
402  if (!DSA_set0_key(dsa, Y, NULL)) {
403  /* QPG attached, cleaned up by DSA_fre() */
404  DSA_free(dsa);
405  BN_free(Y);
406  return NULL;
407  }
408 #endif /* OPENSSL_VERSION_NUMBER */
409  return dsa;
410 }
411 #endif /* USE_DSA */
412 
413 RSA *
414 ldns_key_buf2rsa(const ldns_buffer *key)
415 {
416  return ldns_key_buf2rsa_raw((const unsigned char*)ldns_buffer_begin(key),
417  ldns_buffer_position(key));
418 }
419 
420 RSA *
421 ldns_key_buf2rsa_raw(const unsigned char* key, size_t len)
422 {
423  uint16_t offset;
424  uint16_t exp;
425  uint16_t int16;
426  RSA *rsa;
427  BIGNUM *modulus;
428  BIGNUM *exponent;
429 
430  if (len == 0)
431  return NULL;
432  if (key[0] == 0) {
433  if(len < 3)
434  return NULL;
435  /* need some smart comment here XXX*/
436  /* the exponent is too large so it's places
437  * further...???? */
438  memmove(&int16, key+1, 2);
439  exp = ntohs(int16);
440  offset = 3;
441  } else {
442  exp = key[0];
443  offset = 1;
444  }
445 
446  /* key length at least one */
447  if(len < (size_t)offset + exp + 1)
448  return NULL;
449 
450  /* Exponent */
451  exponent = BN_new();
452  if(!exponent) return NULL;
453  (void) BN_bin2bn(key+offset, (int)exp, exponent);
454  offset += exp;
455 
456  /* Modulus */
457  modulus = BN_new();
458  if(!modulus) {
459  BN_free(exponent);
460  return NULL;
461  }
462  /* length of the buffer must match the key length! */
463  (void) BN_bin2bn(key+offset, (int)(len - offset), modulus);
464 
465  rsa = RSA_new();
466  if(!rsa) {
467  BN_free(exponent);
468  BN_free(modulus);
469  return NULL;
470  }
471 #if OPENSSL_VERSION_NUMBER < 0x10100000 || (defined(HAVE_LIBRESSL) && LIBRESSL_VERSION_NUMBER < 0x20700000)
472 #ifndef S_SPLINT_S
473  rsa->n = modulus;
474  rsa->e = exponent;
475 #endif /* splint */
476 #else /* OPENSSL_VERSION_NUMBER */
477  if (!RSA_set0_key(rsa, modulus, exponent, NULL)) {
478  BN_free(exponent);
479  BN_free(modulus);
480  RSA_free(rsa);
481  return NULL;
482  }
483 #endif /* OPENSSL_VERSION_NUMBER */
484 
485  return rsa;
486 }
487 
488 int
489 ldns_digest_evp(const unsigned char* data, unsigned int len, unsigned char* dest,
490  const EVP_MD* md)
491 {
492  EVP_MD_CTX* ctx;
493  ctx = EVP_MD_CTX_create();
494  if(!ctx)
495  return false;
496  if(!EVP_DigestInit_ex(ctx, md, NULL) ||
497  !EVP_DigestUpdate(ctx, data, len) ||
498  !EVP_DigestFinal_ex(ctx, dest, NULL)) {
499  EVP_MD_CTX_destroy(ctx);
500  return false;
501  }
502  EVP_MD_CTX_destroy(ctx);
503  return true;
504 }
505 #endif /* HAVE_SSL */
506 
507 ldns_rr *
508 ldns_key_rr2ds(const ldns_rr *key, ldns_hash h)
509 {
510  ldns_rdf *tmp;
511  ldns_rr *ds;
512  uint16_t keytag;
513  uint8_t sha1hash;
514  uint8_t *digest;
515  ldns_buffer *data_buf;
516 #ifdef USE_GOST
517  const EVP_MD* md = NULL;
518 #endif
519 
520  if (ldns_rr_get_type(key) != LDNS_RR_TYPE_DNSKEY) {
521  return NULL;
522  }
523 
524  ds = ldns_rr_new();
525  if (!ds) {
526  return NULL;
527  }
528  ldns_rr_set_type(ds, LDNS_RR_TYPE_DS);
529  ldns_rr_set_owner(ds, ldns_rdf_clone(
530  ldns_rr_owner(key)));
531  ldns_rr_set_ttl(ds, ldns_rr_ttl(key));
532  ldns_rr_set_class(ds, ldns_rr_get_class(key));
533 
534  switch(h) {
535  default:
536  case LDNS_SHA1:
537  digest = LDNS_XMALLOC(uint8_t, LDNS_SHA1_DIGEST_LENGTH);
538  if (!digest) {
539  ldns_rr_free(ds);
540  return NULL;
541  }
542  break;
543  case LDNS_SHA256:
544  digest = LDNS_XMALLOC(uint8_t, LDNS_SHA256_DIGEST_LENGTH);
545  if (!digest) {
546  ldns_rr_free(ds);
547  return NULL;
548  }
549  break;
550  case LDNS_HASH_GOST:
551 #ifdef USE_GOST
552  (void)ldns_key_EVP_load_gost_id();
553  md = EVP_get_digestbyname("md_gost94");
554  if(!md) {
555  ldns_rr_free(ds);
556  return NULL;
557  }
558  digest = LDNS_XMALLOC(uint8_t, EVP_MD_size(md));
559  if (!digest) {
560  ldns_rr_free(ds);
561  return NULL;
562  }
563  break;
564 #else
565  /* not implemented */
566  ldns_rr_free(ds);
567  return NULL;
568 #endif
569  case LDNS_SHA384:
570 #ifdef USE_ECDSA
571  digest = LDNS_XMALLOC(uint8_t, SHA384_DIGEST_LENGTH);
572  if (!digest) {
573  ldns_rr_free(ds);
574  return NULL;
575  }
576  break;
577 #else
578  /* not implemented */
579  ldns_rr_free(ds);
580  return NULL;
581 #endif
582  }
583 
584  data_buf = ldns_buffer_new(LDNS_MAX_PACKETLEN);
585  if (!data_buf) {
586  LDNS_FREE(digest);
587  ldns_rr_free(ds);
588  return NULL;
589  }
590 
591  /* keytag */
592  keytag = htons(ldns_calc_keytag((ldns_rr*)key));
593  tmp = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_INT16,
594  sizeof(uint16_t),
595  &keytag);
596  ldns_rr_push_rdf(ds, tmp);
597 
598  /* copy the algorithm field */
599  if ((tmp = ldns_rr_rdf(key, 2)) == NULL) {
600  LDNS_FREE(digest);
601  ldns_buffer_free(data_buf);
602  ldns_rr_free(ds);
603  return NULL;
604  } else {
605  ldns_rr_push_rdf(ds, ldns_rdf_clone( tmp ));
606  }
607 
608  /* digest hash type */
609  sha1hash = (uint8_t)h;
610  tmp = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_INT8,
611  sizeof(uint8_t),
612  &sha1hash);
613  ldns_rr_push_rdf(ds, tmp);
614 
615  /* digest */
616  /* owner name */
617  tmp = ldns_rdf_clone(ldns_rr_owner(key));
618  ldns_dname2canonical(tmp);
619  if (ldns_rdf2buffer_wire(data_buf, tmp) != LDNS_STATUS_OK) {
620  LDNS_FREE(digest);
621  ldns_buffer_free(data_buf);
622  ldns_rr_free(ds);
623  ldns_rdf_deep_free(tmp);
624  return NULL;
625  }
626  ldns_rdf_deep_free(tmp);
627 
628  /* all the rdata's */
629  if (ldns_rr_rdata2buffer_wire(data_buf,
630  (ldns_rr*)key) != LDNS_STATUS_OK) {
631  LDNS_FREE(digest);
632  ldns_buffer_free(data_buf);
633  ldns_rr_free(ds);
634  return NULL;
635  }
636  switch(h) {
637  case LDNS_SHA1:
638  (void) ldns_sha1((unsigned char *) ldns_buffer_begin(data_buf),
639  (unsigned int) ldns_buffer_position(data_buf),
640  (unsigned char *) digest);
641 
642  tmp = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_HEX,
643  LDNS_SHA1_DIGEST_LENGTH,
644  digest);
645  ldns_rr_push_rdf(ds, tmp);
646 
647  break;
648  case LDNS_SHA256:
649  (void) ldns_sha256((unsigned char *) ldns_buffer_begin(data_buf),
650  (unsigned int) ldns_buffer_position(data_buf),
651  (unsigned char *) digest);
652  tmp = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_HEX,
653  LDNS_SHA256_DIGEST_LENGTH,
654  digest);
655  ldns_rr_push_rdf(ds, tmp);
656  break;
657  case LDNS_HASH_GOST:
658 #ifdef USE_GOST
659  if(!ldns_digest_evp((unsigned char *) ldns_buffer_begin(data_buf),
660  (unsigned int) ldns_buffer_position(data_buf),
661  (unsigned char *) digest, md)) {
662  LDNS_FREE(digest);
663  ldns_buffer_free(data_buf);
664  ldns_rr_free(ds);
665  return NULL;
666  }
667  tmp = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_HEX,
668  (size_t)EVP_MD_size(md),
669  digest);
670  ldns_rr_push_rdf(ds, tmp);
671 #endif
672  break;
673  case LDNS_SHA384:
674 #ifdef USE_ECDSA
675  (void) SHA384((unsigned char *) ldns_buffer_begin(data_buf),
676  (unsigned int) ldns_buffer_position(data_buf),
677  (unsigned char *) digest);
678  tmp = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_HEX,
679  SHA384_DIGEST_LENGTH,
680  digest);
681  ldns_rr_push_rdf(ds, tmp);
682 #endif
683  break;
684  }
685 
686  LDNS_FREE(digest);
687  ldns_buffer_free(data_buf);
688  return ds;
689 }
690 
691 /* From RFC3845:
692  *
693  * 2.1.2. The List of Type Bit Map(s) Field
694  *
695  * The RR type space is split into 256 window blocks, each representing
696  * the low-order 8 bits of the 16-bit RR type space. Each block that
697  * has at least one active RR type is encoded using a single octet
698  * window number (from 0 to 255), a single octet bitmap length (from 1
699  * to 32) indicating the number of octets used for the window block's
700  * bitmap, and up to 32 octets (256 bits) of bitmap.
701  *
702  * Window blocks are present in the NSEC RR RDATA in increasing
703  * numerical order.
704  *
705  * "|" denotes concatenation
706  *
707  * Type Bit Map(s) Field = ( Window Block # | Bitmap Length | Bitmap ) +
708  *
709  * <cut>
710  *
711  * Blocks with no types present MUST NOT be included. Trailing zero
712  * octets in the bitmap MUST be omitted. The length of each block's
713  * bitmap is determined by the type code with the largest numerical
714  * value within that block, among the set of RR types present at the
715  * NSEC RR's owner name. Trailing zero octets not specified MUST be
716  * interpreted as zero octets.
717  */
718 ldns_rdf *
719 ldns_dnssec_create_nsec_bitmap(ldns_rr_type rr_type_list[],
720  size_t size,
721  ldns_rr_type nsec_type)
722 {
723  uint8_t window; /* most significant octet of type */
724  uint8_t subtype; /* least significant octet of type */
725  int windows[256]; /* Max subtype per window */
726  uint8_t windowpresent[256]; /* bool if window appears in bitmap */
727  ldns_rr_type* d; /* used to traverse rr_type_list*/
728  size_t i; /* used to traverse windows array */
729 
730  size_t sz; /* size needed for type bitmap rdf */
731  uint8_t* data = NULL; /* rdf data */
732  uint8_t* dptr; /* used to itraverse rdf data */
733  ldns_rdf* rdf; /* bitmap rdf to return */
734 
735  if (nsec_type != LDNS_RR_TYPE_NSEC &&
736  nsec_type != LDNS_RR_TYPE_NSEC3) {
737  return NULL;
738  }
739  memset(windows, 0, sizeof(int)*256);
740  memset(windowpresent, 0, 256);
741 
742  /* Which other windows need to be in the bitmap rdf?
743  */
744  for (d = rr_type_list; d < rr_type_list + size; d++) {
745  window = *d >> 8;
746  subtype = *d & 0xff;
747  windowpresent[window] = 1;
748  if (windows[window] < (int)subtype) {
749  windows[window] = (int)subtype;
750  }
751  }
752 
753  /* How much space do we need in the rdf for those windows?
754  */
755  sz = 0;
756  for (i = 0; i < 256; i++) {
757  if (windowpresent[i]) {
758  sz += windows[i] / 8 + 3;
759  }
760  }
761  if (sz > 0) {
762  /* Format rdf data according RFC3845 Section 2.1.2 (see above)
763  */
764  dptr = data = LDNS_CALLOC(uint8_t, sz);
765  if (!data) {
766  return NULL;
767  }
768  for (i = 0; i < 256; i++) {
769  if (windowpresent[i]) {
770  *dptr++ = (uint8_t)i;
771  *dptr++ = (uint8_t)(windows[i] / 8 + 1);
772 
773  /* Now let windows[i] index the bitmap
774  * within data
775  */
776  windows[i] = (int)(dptr - data);
777 
778  dptr += dptr[-1];
779  }
780  }
781  }
782 
783  /* Set the bits?
784  */
785  for (d = rr_type_list; d < rr_type_list + size; d++) {
786  subtype = *d & 0xff;
787  data[windows[*d >> 8] + subtype/8] |= (0x80 >> (subtype % 8));
788  }
789 
790  /* Allocate and return rdf structure for the data
791  */
792  rdf = ldns_rdf_new(LDNS_RDF_TYPE_BITMAP, sz, data);
793  if (!rdf) {
794  LDNS_FREE(data);
795  return NULL;
796  }
797  return rdf;
798 }
799 
800 int
801 ldns_dnssec_rrsets_contains_type(const ldns_dnssec_rrsets *rrsets,
802  ldns_rr_type type)
803 {
804  const ldns_dnssec_rrsets *cur_rrset = rrsets;
805  while (cur_rrset) {
806  if (cur_rrset->type == type) {
807  return 1;
808  }
809  cur_rrset = cur_rrset->next;
810  }
811  return 0;
812 }
813 
814 ldns_rr *
815 ldns_dnssec_create_nsec(const ldns_dnssec_name *from,
816  const ldns_dnssec_name *to,
817  ldns_rr_type nsec_type)
818 {
819  ldns_rr *nsec_rr;
820  ldns_rr_type types[65536];
821  size_t type_count = 0;
822  ldns_dnssec_rrsets *cur_rrsets;
823  int on_delegation_point;
824 
825  if (!from || !to || (nsec_type != LDNS_RR_TYPE_NSEC)) {
826  return NULL;
827  }
828 
829  nsec_rr = ldns_rr_new();
830  ldns_rr_set_type(nsec_rr, nsec_type);
831  ldns_rr_set_owner(nsec_rr, ldns_rdf_clone(ldns_dnssec_name_name(from)));
832  ldns_rr_push_rdf(nsec_rr, ldns_rdf_clone(ldns_dnssec_name_name(to)));
833 
834  on_delegation_point = ldns_dnssec_rrsets_contains_type(
835  from->rrsets, LDNS_RR_TYPE_NS)
836  && !ldns_dnssec_rrsets_contains_type(
837  from->rrsets, LDNS_RR_TYPE_SOA);
838 
839  cur_rrsets = from->rrsets;
840  while (cur_rrsets) {
841  /* Do not include non-authoritative rrsets on the delegation point
842  * in the type bitmap */
843  if ((on_delegation_point && (
844  cur_rrsets->type == LDNS_RR_TYPE_NS
845  || cur_rrsets->type == LDNS_RR_TYPE_DS))
846  || (!on_delegation_point &&
847  cur_rrsets->type != LDNS_RR_TYPE_RRSIG
848  && cur_rrsets->type != LDNS_RR_TYPE_NSEC)) {
849 
850  types[type_count] = cur_rrsets->type;
851  type_count++;
852  }
853  cur_rrsets = cur_rrsets->next;
854 
855  }
856  types[type_count] = LDNS_RR_TYPE_RRSIG;
857  type_count++;
858  types[type_count] = LDNS_RR_TYPE_NSEC;
859  type_count++;
860 
861  ldns_rr_push_rdf(nsec_rr, ldns_dnssec_create_nsec_bitmap(types,
862  type_count,
863  nsec_type));
864 
865  return nsec_rr;
866 }
867 
868 ldns_rr *
869 ldns_dnssec_create_nsec3(const ldns_dnssec_name *from,
870  const ldns_dnssec_name *to,
871  const ldns_rdf *zone_name,
872  uint8_t algorithm,
873  uint8_t flags,
874  uint16_t iterations,
875  uint8_t salt_length,
876  const uint8_t *salt)
877 {
878  ldns_rr *nsec_rr;
879  ldns_rr_type types[65536];
880  size_t type_count = 0;
881  ldns_dnssec_rrsets *cur_rrsets;
882  ldns_status status;
883  int on_delegation_point;
884 
885  if (!from) {
886  return NULL;
887  }
888 
889  nsec_rr = ldns_rr_new_frm_type(LDNS_RR_TYPE_NSEC3);
890  ldns_rr_set_owner(nsec_rr,
891  ldns_nsec3_hash_name(ldns_dnssec_name_name(from),
892  algorithm,
893  iterations,
894  salt_length,
895  salt));
896  status = ldns_dname_cat(ldns_rr_owner(nsec_rr), zone_name);
897  if(status != LDNS_STATUS_OK) {
898  ldns_rr_free(nsec_rr);
899  return NULL;
900  }
901  ldns_nsec3_add_param_rdfs(nsec_rr,
902  algorithm,
903  flags,
904  iterations,
905  salt_length,
906  salt);
907 
908  on_delegation_point = ldns_dnssec_rrsets_contains_type(
909  from->rrsets, LDNS_RR_TYPE_NS)
910  && !ldns_dnssec_rrsets_contains_type(
911  from->rrsets, LDNS_RR_TYPE_SOA);
912  cur_rrsets = from->rrsets;
913  while (cur_rrsets) {
914  /* Do not include non-authoritative rrsets on the delegation point
915  * in the type bitmap. Potentially not skipping insecure
916  * delegation should have been done earlier, in function
917  * ldns_dnssec_zone_create_nsec3s, or even earlier in:
918  * ldns_dnssec_zone_sign_nsec3_flg .
919  */
920  if ((on_delegation_point && (
921  cur_rrsets->type == LDNS_RR_TYPE_NS
922  || cur_rrsets->type == LDNS_RR_TYPE_DS))
923  || (!on_delegation_point &&
924  cur_rrsets->type != LDNS_RR_TYPE_RRSIG)) {
925 
926  types[type_count] = cur_rrsets->type;
927  type_count++;
928  }
929  cur_rrsets = cur_rrsets->next;
930  }
931  /* always add rrsig type if this is not an unsigned
932  * delegation
933  */
934  if (type_count > 0 &&
935  !(type_count == 1 && types[0] == LDNS_RR_TYPE_NS)) {
936  types[type_count] = LDNS_RR_TYPE_RRSIG;
937  type_count++;
938  }
939 
940  /* leave next rdata empty if they weren't precomputed yet */
941  if (to && to->hashed_name) {
942  (void) ldns_rr_set_rdf(nsec_rr,
943  ldns_rdf_clone(to->hashed_name),
944  4);
945  } else {
946  (void) ldns_rr_set_rdf(nsec_rr, NULL, 4);
947  }
948 
949  ldns_rr_push_rdf(nsec_rr,
950  ldns_dnssec_create_nsec_bitmap(types,
951  type_count,
952  LDNS_RR_TYPE_NSEC3));
953 
954  return nsec_rr;
955 }
956 
957 ldns_rr *
958 ldns_create_nsec(ldns_rdf *cur_owner, ldns_rdf *next_owner, ldns_rr_list *rrs)
959 {
960  /* we do not do any check here - garbage in, garbage out */
961 
962  /* the start and end names - get the type from the
963  * before rrlist */
964 
965  /* inefficient, just give it a name, a next name, and a list of rrs */
966  /* we make 1 big uberbitmap first, then windows */
967  /* todo: make something more efficient :) */
968  uint16_t i;
969  ldns_rr *i_rr;
970  uint16_t i_type;
971 
972  ldns_rr *nsec = NULL;
973  ldns_rr_type i_type_list[65536];
974  size_t type_count = 0;
975 
976  nsec = ldns_rr_new();
977  ldns_rr_set_type(nsec, LDNS_RR_TYPE_NSEC);
978  ldns_rr_set_owner(nsec, ldns_rdf_clone(cur_owner));
979  ldns_rr_push_rdf(nsec, ldns_rdf_clone(next_owner));
980 
981  for (i = 0; i < ldns_rr_list_rr_count(rrs); i++) {
982  i_rr = ldns_rr_list_rr(rrs, i);
983  if (ldns_rdf_compare(cur_owner,
984  ldns_rr_owner(i_rr)) == 0) {
985  i_type = ldns_rr_get_type(i_rr);
986  if (i_type != LDNS_RR_TYPE_RRSIG && i_type != LDNS_RR_TYPE_NSEC) {
987  if (type_count == 0 || i_type_list[type_count-1] != i_type) {
988  i_type_list[type_count] = i_type;
989  type_count++;
990  }
991  }
992  }
993  }
994 
995  i_type_list[type_count] = LDNS_RR_TYPE_RRSIG;
996  type_count++;
997  i_type_list[type_count] = LDNS_RR_TYPE_NSEC;
998  type_count++;
999 
1000  ldns_rr_push_rdf(nsec,
1001  ldns_dnssec_create_nsec_bitmap(i_type_list,
1002  type_count, LDNS_RR_TYPE_NSEC));
1003 
1004  return nsec;
1005 }
1006 
1007 ldns_rdf *
1008 ldns_nsec3_hash_name(const ldns_rdf *name,
1009  uint8_t algorithm,
1010  uint16_t iterations,
1011  uint8_t salt_length,
1012  const uint8_t *salt)
1013 {
1014  size_t hashed_owner_str_len;
1015  ldns_rdf *cann;
1016  ldns_rdf *hashed_owner;
1017  unsigned char *hashed_owner_str;
1018  char *hashed_owner_b32;
1019  size_t hashed_owner_b32_len;
1020  uint32_t cur_it;
1021  /* define to contain the largest possible hash, which is
1022  * sha1 at the moment */
1023  unsigned char hash[LDNS_SHA1_DIGEST_LENGTH];
1024  ldns_status status;
1025 
1026  /* TODO: mnemonic list for hash algs SHA-1, default to 1 now (sha1) */
1027  if (algorithm != LDNS_SHA1) {
1028  return NULL;
1029  }
1030 
1031  /* prepare the owner name according to the draft section bla */
1032  cann = ldns_rdf_clone(name);
1033  if(!cann) {
1034 #ifdef STDERR_MSGS
1035  fprintf(stderr, "Memory error\n");
1036 #endif
1037  return NULL;
1038  }
1039  ldns_dname2canonical(cann);
1040 
1041  hashed_owner_str_len = salt_length + ldns_rdf_size(cann);
1042  hashed_owner_str = LDNS_XMALLOC(unsigned char, hashed_owner_str_len);
1043  if(!hashed_owner_str) {
1044  ldns_rdf_deep_free(cann);
1045  return NULL;
1046  }
1047  memcpy(hashed_owner_str, ldns_rdf_data(cann), ldns_rdf_size(cann));
1048  memcpy(hashed_owner_str + ldns_rdf_size(cann), salt, salt_length);
1049  ldns_rdf_deep_free(cann);
1050 
1051  for (cur_it = iterations + 1; cur_it > 0; cur_it--) {
1052  (void) ldns_sha1((unsigned char *) hashed_owner_str,
1053  (unsigned int) hashed_owner_str_len, hash);
1054 
1055  LDNS_FREE(hashed_owner_str);
1056  hashed_owner_str_len = salt_length + LDNS_SHA1_DIGEST_LENGTH;
1057  hashed_owner_str = LDNS_XMALLOC(unsigned char, hashed_owner_str_len);
1058  if (!hashed_owner_str) {
1059  return NULL;
1060  }
1061  memcpy(hashed_owner_str, hash, LDNS_SHA1_DIGEST_LENGTH);
1062  memcpy(hashed_owner_str + LDNS_SHA1_DIGEST_LENGTH, salt, salt_length);
1063  hashed_owner_str_len = LDNS_SHA1_DIGEST_LENGTH + salt_length;
1064  }
1065 
1066  LDNS_FREE(hashed_owner_str);
1067  hashed_owner_str = hash;
1068  hashed_owner_str_len = LDNS_SHA1_DIGEST_LENGTH;
1069 
1070  hashed_owner_b32 = LDNS_XMALLOC(char,
1071  ldns_b32_ntop_calculate_size(hashed_owner_str_len) + 1);
1072  if(!hashed_owner_b32) {
1073  return NULL;
1074  }
1075  hashed_owner_b32_len = (size_t) ldns_b32_ntop_extended_hex(
1076  (uint8_t *) hashed_owner_str,
1077  hashed_owner_str_len,
1078  hashed_owner_b32,
1079  ldns_b32_ntop_calculate_size(hashed_owner_str_len)+1);
1080  if (hashed_owner_b32_len < 1) {
1081 #ifdef STDERR_MSGS
1082  fprintf(stderr, "Error in base32 extended hex encoding ");
1083  fprintf(stderr, "of hashed owner name (name: ");
1084  ldns_rdf_print(stderr, name);
1085  fprintf(stderr, ", return code: %u)\n",
1086  (unsigned int) hashed_owner_b32_len);
1087 #endif
1088  LDNS_FREE(hashed_owner_b32);
1089  return NULL;
1090  }
1091  hashed_owner_b32[hashed_owner_b32_len] = '\0';
1092 
1093  status = ldns_str2rdf_dname(&hashed_owner, hashed_owner_b32);
1094  if (status != LDNS_STATUS_OK) {
1095 #ifdef STDERR_MSGS
1096  fprintf(stderr, "Error creating rdf from %s\n", hashed_owner_b32);
1097 #endif
1098  LDNS_FREE(hashed_owner_b32);
1099  return NULL;
1100  }
1101 
1102  LDNS_FREE(hashed_owner_b32);
1103  return hashed_owner;
1104 }
1105 
1106 void
1107 ldns_nsec3_add_param_rdfs(ldns_rr *rr,
1108  uint8_t algorithm,
1109  uint8_t flags,
1110  uint16_t iterations,
1111  uint8_t salt_length,
1112  const uint8_t *salt)
1113 {
1114  ldns_rdf *salt_rdf = NULL;
1115  uint8_t *salt_data = NULL;
1116  ldns_rdf *old;
1117 
1118  old = ldns_rr_set_rdf(rr,
1119  ldns_rdf_new_frm_data(LDNS_RDF_TYPE_INT8,
1120  1, (void*)&algorithm),
1121  0);
1122  if (old) ldns_rdf_deep_free(old);
1123 
1124  old = ldns_rr_set_rdf(rr,
1125  ldns_rdf_new_frm_data(LDNS_RDF_TYPE_INT8,
1126  1, (void*)&flags),
1127  1);
1128  if (old) ldns_rdf_deep_free(old);
1129 
1130  old = ldns_rr_set_rdf(rr,
1131  ldns_native2rdf_int16(LDNS_RDF_TYPE_INT16,
1132  iterations),
1133  2);
1134  if (old) ldns_rdf_deep_free(old);
1135 
1136  salt_data = LDNS_XMALLOC(uint8_t, salt_length + 1);
1137  if(!salt_data) {
1138  /* no way to return error */
1139  return;
1140  }
1141  salt_data[0] = salt_length;
1142  memcpy(salt_data + 1, salt, salt_length);
1143  salt_rdf = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_NSEC3_SALT,
1144  salt_length + 1,
1145  salt_data);
1146  if(!salt_rdf) {
1147  LDNS_FREE(salt_data);
1148  /* no way to return error */
1149  return;
1150  }
1151 
1152  old = ldns_rr_set_rdf(rr, salt_rdf, 3);
1153  if (old) ldns_rdf_deep_free(old);
1154  LDNS_FREE(salt_data);
1155 }
1156 
1157 static int
1158 rr_list_delegation_only(const ldns_rdf *origin, const ldns_rr_list *rr_list)
1159 {
1160  size_t i;
1161  ldns_rr *cur_rr;
1162  if (!origin || !rr_list) return 0;
1163  for (i = 0; i < ldns_rr_list_rr_count(rr_list); i++) {
1164  cur_rr = ldns_rr_list_rr(rr_list, i);
1165  if (ldns_dname_compare(ldns_rr_owner(cur_rr), origin) == 0) {
1166  return 0;
1167  }
1168  if (ldns_rr_get_type(cur_rr) != LDNS_RR_TYPE_NS) {
1169  return 0;
1170  }
1171  }
1172  return 1;
1173 }
1174 
1175 /* this will NOT return the NSEC3 completed, you will have to run the
1176  finalize function on the rrlist later! */
1177 ldns_rr *
1178 ldns_create_nsec3(const ldns_rdf *cur_owner,
1179  const ldns_rdf *cur_zone,
1180  const ldns_rr_list *rrs,
1181  uint8_t algorithm,
1182  uint8_t flags,
1183  uint16_t iterations,
1184  uint8_t salt_length,
1185  const uint8_t *salt,
1186  bool emptynonterminal)
1187 {
1188  size_t i;
1189  ldns_rr *i_rr;
1190  uint16_t i_type;
1191 
1192  ldns_rr *nsec = NULL;
1193  ldns_rdf *hashed_owner = NULL;
1194 
1195  ldns_status status;
1196 
1197  ldns_rr_type i_type_list[1024];
1198  size_t type_count = 0;
1199 
1200  hashed_owner = ldns_nsec3_hash_name(cur_owner,
1201  algorithm,
1202  iterations,
1203  salt_length,
1204  salt);
1205  status = ldns_dname_cat(hashed_owner, cur_zone);
1206  if(status != LDNS_STATUS_OK) {
1207  ldns_rdf_deep_free(hashed_owner);
1208  return NULL;
1209  }
1210  nsec = ldns_rr_new_frm_type(LDNS_RR_TYPE_NSEC3);
1211  if(!nsec) {
1212  ldns_rdf_deep_free(hashed_owner);
1213  return NULL;
1214  }
1215  ldns_rr_set_type(nsec, LDNS_RR_TYPE_NSEC3);
1216  ldns_rr_set_owner(nsec, hashed_owner);
1217 
1218  ldns_nsec3_add_param_rdfs(nsec,
1219  algorithm,
1220  flags,
1221  iterations,
1222  salt_length,
1223  salt);
1224  (void) ldns_rr_set_rdf(nsec, NULL, 4);
1225 
1226 
1227  for (i = 0; i < ldns_rr_list_rr_count(rrs); i++) {
1228  i_rr = ldns_rr_list_rr(rrs, i);
1229  if (ldns_rdf_compare(cur_owner,
1230  ldns_rr_owner(i_rr)) == 0) {
1231  i_type = ldns_rr_get_type(i_rr);
1232  if (type_count == 0 || i_type_list[type_count-1] != i_type) {
1233  i_type_list[type_count] = i_type;
1234  type_count++;
1235  }
1236  }
1237  }
1238 
1239  /* add RRSIG anyway, but only if this is not an ENT or
1240  * an unsigned delegation */
1241  if (!emptynonterminal && !rr_list_delegation_only(cur_zone, rrs)) {
1242  i_type_list[type_count] = LDNS_RR_TYPE_RRSIG;
1243  type_count++;
1244  }
1245 
1246  /* and SOA if owner == zone */
1247  if (ldns_dname_compare(cur_zone, cur_owner) == 0) {
1248  i_type_list[type_count] = LDNS_RR_TYPE_SOA;
1249  type_count++;
1250  }
1251 
1252  ldns_rr_push_rdf(nsec,
1253  ldns_dnssec_create_nsec_bitmap(i_type_list,
1254  type_count, LDNS_RR_TYPE_NSEC3));
1255 
1256  return nsec;
1257 }
1258 
1259 uint8_t
1260 ldns_nsec3_algorithm(const ldns_rr *nsec3_rr)
1261 {
1262  if (nsec3_rr &&
1263  (ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3 ||
1264  ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3PARAM)
1265  && (ldns_rr_rdf(nsec3_rr, 0) != NULL)
1266  && ldns_rdf_size(ldns_rr_rdf(nsec3_rr, 0)) > 0) {
1267  return ldns_rdf2native_int8(ldns_rr_rdf(nsec3_rr, 0));
1268  }
1269  return 0;
1270 }
1271 
1272 uint8_t
1273 ldns_nsec3_flags(const ldns_rr *nsec3_rr)
1274 {
1275  if (nsec3_rr &&
1276  (ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3 ||
1277  ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3PARAM)
1278  && (ldns_rr_rdf(nsec3_rr, 1) != NULL)
1279  && ldns_rdf_size(ldns_rr_rdf(nsec3_rr, 1)) > 0) {
1280  return ldns_rdf2native_int8(ldns_rr_rdf(nsec3_rr, 1));
1281  }
1282  return 0;
1283 }
1284 
1285 bool
1286 ldns_nsec3_optout(const ldns_rr *nsec3_rr)
1287 {
1288  return (ldns_nsec3_flags(nsec3_rr) & LDNS_NSEC3_VARS_OPTOUT_MASK);
1289 }
1290 
1291 uint16_t
1292 ldns_nsec3_iterations(const ldns_rr *nsec3_rr)
1293 {
1294  if (nsec3_rr &&
1295  (ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3 ||
1296  ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3PARAM)
1297  && (ldns_rr_rdf(nsec3_rr, 2) != NULL)
1298  && ldns_rdf_size(ldns_rr_rdf(nsec3_rr, 2)) > 0) {
1299  return ldns_rdf2native_int16(ldns_rr_rdf(nsec3_rr, 2));
1300  }
1301  return 0;
1302 
1303 }
1304 
1305 ldns_rdf *
1306 ldns_nsec3_salt(const ldns_rr *nsec3_rr)
1307 {
1308  if (nsec3_rr &&
1309  (ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3 ||
1310  ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3PARAM)
1311  ) {
1312  return ldns_rr_rdf(nsec3_rr, 3);
1313  }
1314  return NULL;
1315 }
1316 
1317 uint8_t
1318 ldns_nsec3_salt_length(const ldns_rr *nsec3_rr)
1319 {
1320  ldns_rdf *salt_rdf = ldns_nsec3_salt(nsec3_rr);
1321  if (salt_rdf && ldns_rdf_size(salt_rdf) > 0) {
1322  return (uint8_t) ldns_rdf_data(salt_rdf)[0];
1323  }
1324  return 0;
1325 }
1326 
1327 /* allocs data, free with LDNS_FREE() */
1328 uint8_t *
1329 ldns_nsec3_salt_data(const ldns_rr *nsec3_rr)
1330 {
1331  uint8_t salt_length;
1332  uint8_t *salt;
1333 
1334  ldns_rdf *salt_rdf = ldns_nsec3_salt(nsec3_rr);
1335  if (salt_rdf && ldns_rdf_size(salt_rdf) > 0) {
1336  salt_length = ldns_rdf_data(salt_rdf)[0];
1337  if((size_t)salt_length+1 > ldns_rdf_size(salt_rdf))
1338  return NULL;
1339  salt = LDNS_XMALLOC(uint8_t, salt_length);
1340  if(!salt) return NULL;
1341  memcpy(salt, &ldns_rdf_data(salt_rdf)[1], salt_length);
1342  return salt;
1343  }
1344  return NULL;
1345 }
1346 
1347 ldns_rdf *
1348 ldns_nsec3_next_owner(const ldns_rr *nsec3_rr)
1349 {
1350  if (!nsec3_rr || ldns_rr_get_type(nsec3_rr) != LDNS_RR_TYPE_NSEC3) {
1351  return NULL;
1352  } else {
1353  return ldns_rr_rdf(nsec3_rr, 4);
1354  }
1355 }
1356 
1357 ldns_rdf *
1358 ldns_nsec3_bitmap(const ldns_rr *nsec3_rr)
1359 {
1360  if (!nsec3_rr || ldns_rr_get_type(nsec3_rr) != LDNS_RR_TYPE_NSEC3) {
1361  return NULL;
1362  } else {
1363  return ldns_rr_rdf(nsec3_rr, 5);
1364  }
1365 }
1366 
1367 ldns_rdf *
1368 ldns_nsec3_hash_name_frm_nsec3(const ldns_rr *nsec, const ldns_rdf *name)
1369 {
1370  uint8_t algorithm;
1371  uint16_t iterations;
1372  uint8_t salt_length;
1373  uint8_t *salt = 0;
1374 
1375  ldns_rdf *hashed_owner;
1376 
1377  algorithm = ldns_nsec3_algorithm(nsec);
1378  salt_length = ldns_nsec3_salt_length(nsec);
1379  salt = ldns_nsec3_salt_data(nsec);
1380  iterations = ldns_nsec3_iterations(nsec);
1381 
1382  hashed_owner = ldns_nsec3_hash_name(name,
1383  algorithm,
1384  iterations,
1385  salt_length,
1386  salt);
1387 
1388  LDNS_FREE(salt);
1389  return hashed_owner;
1390 }
1391 
1392 bool
1393 ldns_nsec_bitmap_covers_type(const ldns_rdf* bitmap, ldns_rr_type type)
1394 {
1395  uint8_t* dptr;
1396  uint8_t* dend;
1397 
1398  /* From RFC3845 Section 2.1.2:
1399  *
1400  * "The RR type space is split into 256 window blocks, each re-
1401  * presenting the low-order 8 bits of the 16-bit RR type space."
1402  */
1403  uint8_t window = type >> 8;
1404  uint8_t subtype = type & 0xff;
1405 
1406  if (! bitmap) {
1407  return false;
1408  }
1409  assert(ldns_rdf_get_type(bitmap) == LDNS_RDF_TYPE_BITMAP);
1410 
1411  dptr = ldns_rdf_data(bitmap);
1412  dend = ldns_rdf_data(bitmap) + ldns_rdf_size(bitmap);
1413 
1414  /* Type Bitmap = ( Window Block # | Bitmap Length | Bitmap ) +
1415  * dptr[0] dptr[1] dptr[2:]
1416  */
1417  while (dptr < dend && dptr[0] <= window) {
1418 
1419  if (dptr[0] == window && subtype / 8 < dptr[1] &&
1420  dptr + dptr[1] + 2 <= dend) {
1421 
1422  return dptr[2 + subtype / 8] & (0x80 >> (subtype % 8));
1423  }
1424  dptr += dptr[1] + 2; /* next window */
1425  }
1426  return false;
1427 }
1428 
1429 ldns_status
1430 ldns_nsec_bitmap_set_type(ldns_rdf* bitmap, ldns_rr_type type)
1431 {
1432  uint8_t* dptr;
1433  uint8_t* dend;
1434 
1435  /* From RFC3845 Section 2.1.2:
1436  *
1437  * "The RR type space is split into 256 window blocks, each re-
1438  * presenting the low-order 8 bits of the 16-bit RR type space."
1439  */
1440  uint8_t window = type >> 8;
1441  uint8_t subtype = type & 0xff;
1442 
1443  if (! bitmap) {
1444  return false;
1445  }
1446  assert(ldns_rdf_get_type(bitmap) == LDNS_RDF_TYPE_BITMAP);
1447 
1448  dptr = ldns_rdf_data(bitmap);
1449  dend = ldns_rdf_data(bitmap) + ldns_rdf_size(bitmap);
1450 
1451  /* Type Bitmap = ( Window Block # | Bitmap Length | Bitmap ) +
1452  * dptr[0] dptr[1] dptr[2:]
1453  */
1454  while (dptr < dend && dptr[0] <= window) {
1455 
1456  if (dptr[0] == window && subtype / 8 < dptr[1] &&
1457  dptr + dptr[1] + 2 <= dend) {
1458 
1459  dptr[2 + subtype / 8] |= (0x80 >> (subtype % 8));
1460  return LDNS_STATUS_OK;
1461  }
1462  dptr += dptr[1] + 2; /* next window */
1463  }
1464  return LDNS_STATUS_TYPE_NOT_IN_BITMAP;
1465 }
1466 
1467 ldns_status
1468 ldns_nsec_bitmap_clear_type(ldns_rdf* bitmap, ldns_rr_type type)
1469 {
1470  uint8_t* dptr;
1471  uint8_t* dend;
1472 
1473  /* From RFC3845 Section 2.1.2:
1474  *
1475  * "The RR type space is split into 256 window blocks, each re-
1476  * presenting the low-order 8 bits of the 16-bit RR type space."
1477  */
1478  uint8_t window = type >> 8;
1479  uint8_t subtype = type & 0xff;
1480 
1481  if (! bitmap) {
1482  return false;
1483  }
1484 
1485  assert(ldns_rdf_get_type(bitmap) == LDNS_RDF_TYPE_BITMAP);
1486 
1487  dptr = ldns_rdf_data(bitmap);
1488  dend = ldns_rdf_data(bitmap) + ldns_rdf_size(bitmap);
1489 
1490  /* Type Bitmap = ( Window Block # | Bitmap Length | Bitmap ) +
1491  * dptr[0] dptr[1] dptr[2:]
1492  */
1493  while (dptr < dend && dptr[0] <= window) {
1494 
1495  if (dptr[0] == window && subtype / 8 < dptr[1] &&
1496  dptr + dptr[1] + 2 <= dend) {
1497 
1498  dptr[2 + subtype / 8] &= ~(0x80 >> (subtype % 8));
1499  return LDNS_STATUS_OK;
1500  }
1501  dptr += dptr[1] + 2; /* next window */
1502  }
1503  return LDNS_STATUS_TYPE_NOT_IN_BITMAP;
1504 }
1505 
1506 
1507 bool
1508 ldns_nsec_covers_name(const ldns_rr *nsec, const ldns_rdf *name)
1509 {
1510  ldns_rdf *nsec_owner = ldns_rr_owner(nsec);
1511  ldns_rdf *hash_next;
1512  char *next_hash_str;
1513  ldns_rdf *nsec_next = NULL;
1514  ldns_status status;
1515  ldns_rdf *chopped_dname;
1516  bool result;
1517 
1518  if (ldns_rr_get_type(nsec) == LDNS_RR_TYPE_NSEC) {
1519  if (ldns_rr_rdf(nsec, 0) != NULL) {
1520  nsec_next = ldns_rdf_clone(ldns_rr_rdf(nsec, 0));
1521  } else {
1522  return false;
1523  }
1524  } else if (ldns_rr_get_type(nsec) == LDNS_RR_TYPE_NSEC3) {
1525  hash_next = ldns_nsec3_next_owner(nsec);
1526  next_hash_str = ldns_rdf2str(hash_next);
1527  nsec_next = ldns_dname_new_frm_str(next_hash_str);
1528  LDNS_FREE(next_hash_str);
1529  chopped_dname = ldns_dname_left_chop(nsec_owner);
1530  status = ldns_dname_cat(nsec_next, chopped_dname);
1531  ldns_rdf_deep_free(chopped_dname);
1532  if (status != LDNS_STATUS_OK) {
1533  printf("error catting: %s\n", ldns_get_errorstr_by_id(status));
1534  }
1535  } else {
1536  ldns_rdf_deep_free(nsec_next);
1537  return false;
1538  }
1539 
1540  /* in the case of the last nsec */
1541  if(ldns_dname_compare(nsec_owner, nsec_next) > 0) {
1542  result = (ldns_dname_compare(nsec_owner, name) <= 0 ||
1543  ldns_dname_compare(name, nsec_next) < 0);
1544  } else if(ldns_dname_compare(nsec_owner, nsec_next) < 0) {
1545  result = (ldns_dname_compare(nsec_owner, name) <= 0 &&
1546  ldns_dname_compare(name, nsec_next) < 0);
1547  } else {
1548  result = true;
1549  }
1550 
1551  ldns_rdf_deep_free(nsec_next);
1552  return result;
1553 }
1554 
1555 #ifdef HAVE_SSL
1556 /* sig may be null - if so look in the packet */
1557 
1558 ldns_status
1559 ldns_pkt_verify_time(const ldns_pkt *p, ldns_rr_type t, const ldns_rdf *o,
1560  const ldns_rr_list *k, const ldns_rr_list *s,
1561  time_t check_time, ldns_rr_list *good_keys)
1562 {
1563  ldns_rr_list *rrset;
1564  ldns_rr_list *sigs;
1565  ldns_rr_list *sigs_covered;
1566  ldns_rdf *rdf_t;
1567  ldns_rr_type t_netorder;
1568  ldns_status status;
1569 
1570  if (!k) {
1571  return LDNS_STATUS_ERR;
1572  /* return LDNS_STATUS_CRYPTO_NO_DNSKEY; */
1573  }
1574 
1575  if (t == LDNS_RR_TYPE_RRSIG) {
1576  /* we don't have RRSIG(RRSIG) (yet? ;-) ) */
1577  return LDNS_STATUS_ERR;
1578  }
1579 
1580  if (s) {
1581  /* if s is not NULL, the sigs are given to use */
1582  sigs = (ldns_rr_list *)s;
1583  } else {
1584  /* otherwise get them from the packet */
1585  sigs = ldns_pkt_rr_list_by_name_and_type(p, o,
1586  LDNS_RR_TYPE_RRSIG,
1587  LDNS_SECTION_ANY_NOQUESTION);
1588  if (!sigs) {
1589  /* no sigs */
1590  return LDNS_STATUS_ERR;
1591  /* return LDNS_STATUS_CRYPTO_NO_RRSIG; */
1592  }
1593  }
1594 
1595  /* rrsig are subtyped, so now we need to find the correct
1596  * sigs for the type t
1597  */
1598  t_netorder = htons(t); /* rdf are in network order! */
1599  /* a type identifier is a 16-bit number, so the size is 2 bytes */
1600  rdf_t = ldns_rdf_new(LDNS_RDF_TYPE_TYPE, 2, &t_netorder);
1601 
1602  sigs_covered = ldns_rr_list_subtype_by_rdf(sigs, rdf_t, 0);
1603  ldns_rdf_free(rdf_t);
1604  if (! sigs_covered) {
1605  if (! s) {
1606  ldns_rr_list_deep_free(sigs);
1607  }
1608  return LDNS_STATUS_ERR;
1609  }
1610  ldns_rr_list_deep_free(sigs_covered);
1611 
1612  rrset = ldns_pkt_rr_list_by_name_and_type(p, o, t,
1613  LDNS_SECTION_ANY_NOQUESTION);
1614  if (!rrset) {
1615  if (! s) {
1616  ldns_rr_list_deep_free(sigs);
1617  }
1618  return LDNS_STATUS_ERR;
1619  }
1620  status = ldns_verify_time(rrset, sigs, k, check_time, good_keys);
1621  ldns_rr_list_deep_free(rrset);
1622  return status;
1623 }
1624 
1625 ldns_status
1626 ldns_pkt_verify(const ldns_pkt *p, ldns_rr_type t, const ldns_rdf *o,
1627  const ldns_rr_list *k, const ldns_rr_list *s, ldns_rr_list *good_keys)
1628 {
1629  return ldns_pkt_verify_time(p, t, o, k, s, ldns_time(NULL), good_keys);
1630 }
1631 #endif /* HAVE_SSL */
1632 
1633 ldns_status
1634 ldns_dnssec_chain_nsec3_list(ldns_rr_list *nsec3_rrs)
1635 {
1636  size_t i;
1637  char *next_nsec_owner_str;
1638  ldns_rdf *next_nsec_owner_label;
1639  ldns_rdf *next_nsec_rdf;
1640  ldns_status status = LDNS_STATUS_OK;
1641 
1642  for (i = 0; i < ldns_rr_list_rr_count(nsec3_rrs); i++) {
1643  if (i == ldns_rr_list_rr_count(nsec3_rrs) - 1) {
1644  next_nsec_owner_label =
1645  ldns_dname_label(ldns_rr_owner(ldns_rr_list_rr(nsec3_rrs,
1646  0)), 0);
1647  next_nsec_owner_str = ldns_rdf2str(next_nsec_owner_label);
1648  if (next_nsec_owner_str[strlen(next_nsec_owner_str) - 1]
1649  == '.') {
1650  next_nsec_owner_str[strlen(next_nsec_owner_str) - 1]
1651  = '\0';
1652  }
1653  status = ldns_str2rdf_b32_ext(&next_nsec_rdf,
1654  next_nsec_owner_str);
1655  if (!ldns_rr_set_rdf(ldns_rr_list_rr(nsec3_rrs, i),
1656  next_nsec_rdf, 4)) {
1657  /* todo: error */
1658  }
1659 
1660  ldns_rdf_deep_free(next_nsec_owner_label);
1661  LDNS_FREE(next_nsec_owner_str);
1662  } else {
1663  next_nsec_owner_label =
1664  ldns_dname_label(ldns_rr_owner(ldns_rr_list_rr(nsec3_rrs,
1665  i + 1)),
1666  0);
1667  next_nsec_owner_str = ldns_rdf2str(next_nsec_owner_label);
1668  if (next_nsec_owner_str[strlen(next_nsec_owner_str) - 1]
1669  == '.') {
1670  next_nsec_owner_str[strlen(next_nsec_owner_str) - 1]
1671  = '\0';
1672  }
1673  status = ldns_str2rdf_b32_ext(&next_nsec_rdf,
1674  next_nsec_owner_str);
1675  ldns_rdf_deep_free(next_nsec_owner_label);
1676  LDNS_FREE(next_nsec_owner_str);
1677  if (!ldns_rr_set_rdf(ldns_rr_list_rr(nsec3_rrs, i),
1678  next_nsec_rdf, 4)) {
1679  /* todo: error */
1680  }
1681  }
1682  }
1683  return status;
1684 }
1685 
1686 int
1687 qsort_rr_compare_nsec3(const void *a, const void *b)
1688 {
1689  const ldns_rr *rr1 = * (const ldns_rr **) a;
1690  const ldns_rr *rr2 = * (const ldns_rr **) b;
1691  if (rr1 == NULL && rr2 == NULL) {
1692  return 0;
1693  }
1694  if (rr1 == NULL) {
1695  return -1;
1696  }
1697  if (rr2 == NULL) {
1698  return 1;
1699  }
1700  return ldns_rdf_compare(ldns_rr_owner(rr1), ldns_rr_owner(rr2));
1701 }
1702 
1703 void
1704 ldns_rr_list_sort_nsec3(ldns_rr_list *unsorted)
1705 {
1706  qsort(unsorted->_rrs,
1707  ldns_rr_list_rr_count(unsorted),
1708  sizeof(ldns_rr *),
1709  qsort_rr_compare_nsec3);
1710 }
1711 
1712 int
1713 ldns_dnssec_default_add_to_signatures( ATTR_UNUSED(ldns_rr *sig)
1714  , ATTR_UNUSED(void *n)
1715  )
1716 {
1717  return LDNS_SIGNATURE_LEAVE_ADD_NEW;
1718 }
1719 
1720 int
1721 ldns_dnssec_default_leave_signatures( ATTR_UNUSED(ldns_rr *sig)
1722  , ATTR_UNUSED(void *n)
1723  )
1724 {
1725  return LDNS_SIGNATURE_LEAVE_NO_ADD;
1726 }
1727 
1728 int
1729 ldns_dnssec_default_delete_signatures( ATTR_UNUSED(ldns_rr *sig)
1730  , ATTR_UNUSED(void *n)
1731  )
1732 {
1733  return LDNS_SIGNATURE_REMOVE_NO_ADD;
1734 }
1735 
1736 int
1737 ldns_dnssec_default_replace_signatures( ATTR_UNUSED(ldns_rr *sig)
1738  , ATTR_UNUSED(void *n)
1739  )
1740 {
1741  return LDNS_SIGNATURE_REMOVE_ADD_NEW;
1742 }
1743 
1744 #ifdef HAVE_SSL
1745 ldns_rdf *
1746 ldns_convert_dsa_rrsig_asn12rdf(const ldns_buffer *sig,
1747  const long sig_len)
1748 {
1749 #ifdef USE_DSA
1750  ldns_rdf *sigdata_rdf;
1751  DSA_SIG *dsasig;
1752  const BIGNUM *R, *S;
1753  unsigned char *dsasig_data = (unsigned char*)ldns_buffer_begin(sig);
1754  size_t byte_offset;
1755 
1756  dsasig = d2i_DSA_SIG(NULL,
1757  (const unsigned char **)&dsasig_data,
1758  sig_len);
1759  if (!dsasig) {
1760  DSA_SIG_free(dsasig);
1761  return NULL;
1762  }
1763 
1764  dsasig_data = LDNS_XMALLOC(unsigned char, 41);
1765  if(!dsasig_data) {
1766  DSA_SIG_free(dsasig);
1767  return NULL;
1768  }
1769  dsasig_data[0] = 0;
1770 # ifdef HAVE_DSA_SIG_GET0
1771  DSA_SIG_get0(dsasig, &R, &S);
1772 # else
1773  R = dsasig->r;
1774  S = dsasig->s;
1775 # endif
1776  byte_offset = (size_t) (20 - BN_num_bytes(R));
1777  if (byte_offset > 20) {
1778  DSA_SIG_free(dsasig);
1779  LDNS_FREE(dsasig_data);
1780  return NULL;
1781  }
1782  memset(&dsasig_data[1], 0, byte_offset);
1783  BN_bn2bin(R, &dsasig_data[1 + byte_offset]);
1784  byte_offset = (size_t) (20 - BN_num_bytes(S));
1785  if (byte_offset > 20) {
1786  DSA_SIG_free(dsasig);
1787  LDNS_FREE(dsasig_data);
1788  return NULL;
1789  }
1790  memset(&dsasig_data[21], 0, byte_offset);
1791  BN_bn2bin(S, &dsasig_data[21 + byte_offset]);
1792 
1793  sigdata_rdf = ldns_rdf_new(LDNS_RDF_TYPE_B64, 41, dsasig_data);
1794  if(!sigdata_rdf) {
1795  LDNS_FREE(dsasig_data);
1796  }
1797  DSA_SIG_free(dsasig);
1798 
1799  return sigdata_rdf;
1800 #else
1801  (void)sig; (void)sig_len;
1802  return NULL;
1803 #endif
1804 }
1805 
1806 ldns_status
1807 ldns_convert_dsa_rrsig_rdf2asn1(ldns_buffer *target_buffer,
1808  const ldns_rdf *sig_rdf)
1809 {
1810 #ifdef USE_DSA
1811  /* the EVP api wants the DER encoding of the signature... */
1812  BIGNUM *R, *S;
1813  DSA_SIG *dsasig;
1814  unsigned char *raw_sig = NULL;
1815  int raw_sig_len;
1816 
1817  if(ldns_rdf_size(sig_rdf) < 1 + 2*SHA_DIGEST_LENGTH)
1818  return LDNS_STATUS_SYNTAX_RDATA_ERR;
1819  /* extract the R and S field from the sig buffer */
1820  R = BN_new();
1821  if(!R) return LDNS_STATUS_MEM_ERR;
1822  (void) BN_bin2bn((unsigned char *) ldns_rdf_data(sig_rdf) + 1,
1823  SHA_DIGEST_LENGTH, R);
1824  S = BN_new();
1825  if(!S) {
1826  BN_free(R);
1827  return LDNS_STATUS_MEM_ERR;
1828  }
1829  (void) BN_bin2bn((unsigned char *) ldns_rdf_data(sig_rdf) + 21,
1830  SHA_DIGEST_LENGTH, S);
1831 
1832  dsasig = DSA_SIG_new();
1833  if (!dsasig) {
1834  BN_free(R);
1835  BN_free(S);
1836  return LDNS_STATUS_MEM_ERR;
1837  }
1838 # ifdef HAVE_DSA_SIG_SET0
1839  if (! DSA_SIG_set0(dsasig, R, S)) {
1840  DSA_SIG_free(dsasig);
1841  return LDNS_STATUS_SSL_ERR;
1842  }
1843 # else
1844  dsasig->r = R;
1845  dsasig->s = S;
1846 # endif
1847 
1848  raw_sig_len = i2d_DSA_SIG(dsasig, &raw_sig);
1849  if (raw_sig_len < 0) {
1850  DSA_SIG_free(dsasig);
1851  free(raw_sig);
1852  return LDNS_STATUS_SSL_ERR;
1853  }
1854  if (ldns_buffer_reserve(target_buffer, (size_t) raw_sig_len)) {
1855  ldns_buffer_write(target_buffer, raw_sig, (size_t)raw_sig_len);
1856  }
1857 
1858  DSA_SIG_free(dsasig);
1859  free(raw_sig);
1860 
1861  return ldns_buffer_status(target_buffer);
1862 #else
1863  (void)target_buffer; (void)sig_rdf;
1864  return LDNS_STATUS_CRYPTO_ALGO_NOT_IMPL;
1865 #endif
1866 }
1867 
1868 #ifdef USE_ECDSA
1869 #ifndef S_SPLINT_S
1870 ldns_rdf *
1871 ldns_convert_ecdsa_rrsig_asn1len2rdf(const ldns_buffer *sig,
1872  const long sig_len, int num_bytes)
1873 {
1874  ECDSA_SIG* ecdsa_sig;
1875  const BIGNUM *r, *s;
1876  unsigned char *data = (unsigned char*)ldns_buffer_begin(sig);
1877  ldns_rdf* rdf;
1878  ecdsa_sig = d2i_ECDSA_SIG(NULL, (const unsigned char **)&data, sig_len);
1879  if(!ecdsa_sig) return NULL;
1880 
1881 #ifdef HAVE_ECDSA_SIG_GET0
1882  ECDSA_SIG_get0(ecdsa_sig, &r, &s);
1883 #else
1884  r = ecdsa_sig->r;
1885  s = ecdsa_sig->s;
1886 #endif
1887  /* "r | s". */
1888  if(BN_num_bytes(r) > num_bytes ||
1889  BN_num_bytes(s) > num_bytes) {
1890  ECDSA_SIG_free(ecdsa_sig);
1891  return NULL; /* numbers too big for passed curve size */
1892  }
1893  data = LDNS_XMALLOC(unsigned char, num_bytes*2);
1894  if(!data) {
1895  ECDSA_SIG_free(ecdsa_sig);
1896  return NULL;
1897  }
1898  /* write the bignums (in big-endian) a little offset if the BN code
1899  * wants to write a shorter number of bytes, with zeroes prefixed */
1900  memset(data, 0, num_bytes*2);
1901  BN_bn2bin(r, data+num_bytes-BN_num_bytes(r));
1902  BN_bn2bin(s, data+num_bytes*2-BN_num_bytes(s));
1903  rdf = ldns_rdf_new(LDNS_RDF_TYPE_B64, (size_t)(num_bytes*2), data);
1904  ECDSA_SIG_free(ecdsa_sig);
1905  return rdf;
1906 }
1907 
1908 ldns_status
1909 ldns_convert_ecdsa_rrsig_rdf2asn1(ldns_buffer *target_buffer,
1910  const ldns_rdf *sig_rdf)
1911 {
1912  /* convert from two BIGNUMs in the rdata buffer, to ASN notation.
1913  * ASN preamble: 30440220 <R 32bytefor256> 0220 <S 32bytefor256>
1914  * the '20' is the length of that field (=bnsize).
1915  * the '44' is the total remaining length.
1916  * if negative, start with leading zero.
1917  * if starts with 00s, remove them from the number.
1918  */
1919  uint8_t pre[] = {0x30, 0x44, 0x02, 0x20};
1920  int pre_len = 4;
1921  uint8_t mid[] = {0x02, 0x20};
1922  int mid_len = 2;
1923  int raw_sig_len, r_high, s_high, r_rem=0, s_rem=0;
1924  long bnsize = (long)ldns_rdf_size(sig_rdf) / 2;
1925  uint8_t* d = ldns_rdf_data(sig_rdf);
1926  /* if too short, or not even length, do not bother */
1927  if(bnsize < 16 || (size_t)bnsize*2 != ldns_rdf_size(sig_rdf))
1928  return LDNS_STATUS_ERR;
1929  /* strip leading zeroes from r (but not last one) */
1930  while(r_rem < bnsize-1 && d[r_rem] == 0)
1931  r_rem++;
1932  /* strip leading zeroes from s (but not last one) */
1933  while(s_rem < bnsize-1 && d[bnsize+s_rem] == 0)
1934  s_rem++;
1935 
1936  r_high = ((d[0+r_rem]&0x80)?1:0);
1937  s_high = ((d[bnsize+s_rem]&0x80)?1:0);
1938  raw_sig_len = pre_len + r_high + bnsize - r_rem + mid_len +
1939  s_high + bnsize - s_rem;
1940  if(ldns_buffer_reserve(target_buffer, (size_t) raw_sig_len)) {
1941  ldns_buffer_write_u8(target_buffer, pre[0]);
1942  ldns_buffer_write_u8(target_buffer, raw_sig_len-2);
1943  ldns_buffer_write_u8(target_buffer, pre[2]);
1944  ldns_buffer_write_u8(target_buffer, bnsize + r_high - r_rem);
1945  if(r_high)
1946  ldns_buffer_write_u8(target_buffer, 0);
1947  ldns_buffer_write(target_buffer, d+r_rem, bnsize-r_rem);
1948  ldns_buffer_write(target_buffer, mid, mid_len-1);
1949  ldns_buffer_write_u8(target_buffer, bnsize + s_high - s_rem);
1950  if(s_high)
1951  ldns_buffer_write_u8(target_buffer, 0);
1952  ldns_buffer_write(target_buffer, d+bnsize+s_rem, bnsize-s_rem);
1953  }
1954  return ldns_buffer_status(target_buffer);
1955 }
1956 
1957 #endif /* S_SPLINT_S */
1958 #endif /* USE_ECDSA */
1959 #endif /* HAVE_SSL */
ldns_buffer_free
void ldns_buffer_free(ldns_buffer *buffer)
frees the buffer.
Definition: buffer.c:137
ldns_buffer_reserve
signed char ldns_buffer_reserve(ldns_buffer *buffer, size_t amount)
ensures BUFFER can contain at least AMOUNT more bytes.
Definition: buffer.c:80
ldns_buffer_new
ldns_buffer * ldns_buffer_new(size_t capacity)
creates a new buffer with the specified capacity.
Definition: buffer.c:16
LDNS_MIN_BUFLEN
#define LDNS_MIN_BUFLEN
number of initial bytes in buffer of which we cannot tell the size before hand
Definition: buffer.h:33
ATTR_UNUSED
#define ATTR_UNUSED(x)
Definition: common.h:72
ldns_dname_compare
int ldns_dname_compare(const ldns_rdf *dname1, const ldns_rdf *dname2)
Compares the two dname rdf's according to the algorithm for ordering in RFC4034 Section 6.
Definition: dname.c:359
ldns_dname_left_chop
ldns_rdf * ldns_dname_left_chop(const ldns_rdf *d)
chop one label off the left side of a dname.
Definition: dname.c:189
ldns_dname2canonical
void ldns_dname2canonical(const ldns_rdf *rdf)
Put a dname into canonical fmt - ie.
Definition: dname.c:280
ldns_dname_label_count
uint8_t ldns_dname_label_count(const ldns_rdf *r)
count the number of labels inside a LDNS_RDF_DNAME type rdf.
Definition: dname.c:214
ldns_dname_cat
ldns_status ldns_dname_cat(ldns_rdf *rd1, const ldns_rdf *rd2)
concatenates rd2 after rd1 (rd2 is copied, rd1 is modified)
Definition: dname.c:90
ldns_dname_label
ldns_rdf * ldns_dname_label(const ldns_rdf *rdf, uint8_t labelpos)
look inside the rdf and if it is an LDNS_RDF_TYPE_DNAME try and retrieve a specific label.
Definition: dname.c:560
ldns_dname_new_frm_str
ldns_rdf * ldns_dname_new_frm_str(const char *str)
creates a new dname rdf from a string.
Definition: dname.c:268
ldns_digest_evp
int ldns_digest_evp(const unsigned char *data, unsigned int len, unsigned char *dest, const EVP_MD *md)
Utility function to calculate hash using generic EVP_MD pointer.
Definition: dnssec.c:489
ldns_dnssec_default_delete_signatures
int ldns_dnssec_default_delete_signatures(ldns_rr *sig __attribute__((unused)), void *n __attribute__((unused)))
Definition: dnssec.c:1729
ldns_key_buf2rsa
RSA * ldns_key_buf2rsa(const ldns_buffer *key)
converts a buffer holding key material to a RSA key in openssl.
Definition: dnssec.c:414
ldns_nsec_get_bitmap
ldns_rdf * ldns_nsec_get_bitmap(const ldns_rr *nsec)
Returns the rdata field that contains the bitmap of the covered types of the given NSEC record.
Definition: dnssec.c:89
ldns_nsec_bitmap_covers_type
signed char ldns_nsec_bitmap_covers_type(const ldns_rdf *bitmap, ldns_rr_type type)
Check if RR type t is enumerated and set in the RR type bitmap rdf.
Definition: dnssec.c:1393
ldns_dnssec_create_nsec3
ldns_rr * ldns_dnssec_create_nsec3(const ldns_dnssec_name *from, const ldns_dnssec_name *to, const ldns_rdf *zone_name, uint8_t algorithm, uint8_t flags, uint16_t iterations, uint8_t salt_length, const uint8_t *salt)
Creates NSEC3.
Definition: dnssec.c:869
ldns_create_nsec3
ldns_rr * ldns_create_nsec3(const ldns_rdf *cur_owner, const ldns_rdf *cur_zone, const ldns_rr_list *rrs, uint8_t algorithm, uint8_t flags, uint16_t iterations, uint8_t salt_length, const uint8_t *salt, signed char emptynonterminal)
Definition: dnssec.c:1178
ldns_nsec3_iterations
uint16_t ldns_nsec3_iterations(const ldns_rr *nsec3_rr)
Returns the number of hash iterations used in the given NSEC3 RR.
Definition: dnssec.c:1292
ldns_rr_list_sort_nsec3
void ldns_rr_list_sort_nsec3(ldns_rr_list *unsorted)
sort nsec3 list
Definition: dnssec.c:1704
ldns_convert_ecdsa_rrsig_rdf2asn1
ldns_status ldns_convert_ecdsa_rrsig_rdf2asn1(ldns_buffer *target_buffer, const ldns_rdf *sig_rdf)
Converts the RRSIG signature RDF (from DNS) to a buffer with the signature in ASN1 format as openssl ...
Definition: dnssec.c:1909
ldns_convert_dsa_rrsig_asn12rdf
ldns_rdf * ldns_convert_dsa_rrsig_asn12rdf(const ldns_buffer *sig, const long sig_len)
Converts the DSA signature from ASN1 representation (RFC2459, as used by OpenSSL) to raw signature da...
Definition: dnssec.c:1746
ldns_dnssec_get_dnskey_for_rrsig
ldns_rr * ldns_dnssec_get_dnskey_for_rrsig(const ldns_rr *rrsig, const ldns_rr_list *rrs)
Returns the DNSKEY that corresponds to the given RRSIG rr from the list, if any.
Definition: dnssec.c:62
ldns_dnssec_get_rrsig_for_name_and_type
ldns_rr * ldns_dnssec_get_rrsig_for_name_and_type(const ldns_rdf *name, const ldns_rr_type type, const ldns_rr_list *rrs)
Returns the first RRSIG rr that corresponds to the rrset with the given name and type.
Definition: dnssec.c:34
ldns_dnssec_default_replace_signatures
int ldns_dnssec_default_replace_signatures(ldns_rr *sig __attribute__((unused)), void *n __attribute__((unused)))
Definition: dnssec.c:1737
ldns_nsec3_add_param_rdfs
void ldns_nsec3_add_param_rdfs(ldns_rr *rr, uint8_t algorithm, uint8_t flags, uint16_t iterations, uint8_t salt_length, const uint8_t *salt)
Sets all the NSEC3 options.
Definition: dnssec.c:1107
ldns_convert_ecdsa_rrsig_asn1len2rdf
ldns_rdf * ldns_convert_ecdsa_rrsig_asn1len2rdf(const ldns_buffer *sig, const long sig_len, int num_bytes)
Converts the ECDSA signature from ASN1 representation (as used by OpenSSL) to raw signature data as u...
Definition: dnssec.c:1871
ldns_nsec_covers_name
signed char ldns_nsec_covers_name(const ldns_rr *nsec, const ldns_rdf *name)
Checks coverage of NSEC(3) RR name span Remember that nsec and name must both be in canonical form (i...
Definition: dnssec.c:1508
ldns_dnssec_default_add_to_signatures
int ldns_dnssec_default_add_to_signatures(ldns_rr *sig __attribute__((unused)), void *n __attribute__((unused)))
Definition: dnssec.c:1713
ldns_dnssec_pkt_has_rrsigs
signed char ldns_dnssec_pkt_has_rrsigs(const ldns_pkt *pkt)
Checks whether the packet contains rrsigs.
Definition: dnssec.c:204
ldns_key_buf2rsa_raw
RSA * ldns_key_buf2rsa_raw(const unsigned char *key, size_t len)
Like ldns_key_buf2rsa, but uses raw buffer.
Definition: dnssec.c:421
ldns_calc_keytag_raw
uint16_t ldns_calc_keytag_raw(const uint8_t *key, size_t keysize)
Calculates keytag of DNSSEC key, operates on wireformat rdata.
Definition: dnssec.c:307
ldns_calc_keytag
uint16_t ldns_calc_keytag(const ldns_rr *key)
calculates a keytag of a key for use in DNSSEC.
Definition: dnssec.c:277
ldns_nsec3_salt_length
uint8_t ldns_nsec3_salt_length(const ldns_rr *nsec3_rr)
Returns the length of the salt used in the given NSEC3 RR.
Definition: dnssec.c:1318
ldns_dnssec_default_leave_signatures
int ldns_dnssec_default_leave_signatures(ldns_rr *sig __attribute__((unused)), void *n __attribute__((unused)))
Definition: dnssec.c:1721
ldns_nsec3_flags
uint8_t ldns_nsec3_flags(const ldns_rr *nsec3_rr)
Returns flags field.
Definition: dnssec.c:1273
ldns_dnssec_create_nsec
ldns_rr * ldns_dnssec_create_nsec(const ldns_dnssec_name *from, const ldns_dnssec_name *to, ldns_rr_type nsec_type)
Creates NSEC.
Definition: dnssec.c:815
ldns_create_nsec
ldns_rr * ldns_create_nsec(ldns_rdf *cur_owner, ldns_rdf *next_owner, ldns_rr_list *rrs)
Create a NSEC record.
Definition: dnssec.c:958
ldns_nsec3_salt_data
uint8_t * ldns_nsec3_salt_data(const ldns_rr *nsec3_rr)
Returns the salt bytes used in the given NSEC3 RR.
Definition: dnssec.c:1329
ldns_dnssec_create_nsec_bitmap
ldns_rdf * ldns_dnssec_create_nsec_bitmap(ldns_rr_type rr_type_list[], size_t size, ldns_rr_type nsec_type)
Create the type bitmap for an NSEC(3) record.
Definition: dnssec.c:719
ldns_convert_dsa_rrsig_rdf2asn1
ldns_status ldns_convert_dsa_rrsig_rdf2asn1(ldns_buffer *target_buffer, const ldns_rdf *sig_rdf)
Converts the RRSIG signature RDF (in rfc2536 format) to a buffer with the signature in rfc2459 format...
Definition: dnssec.c:1807
ldns_pkt_verify_time
ldns_status ldns_pkt_verify_time(const ldns_pkt *p, ldns_rr_type t, const ldns_rdf *o, const ldns_rr_list *k, const ldns_rr_list *s, time_t check_time, ldns_rr_list *good_keys)
verify a packet
Definition: dnssec.c:1559
ldns_dnssec_pkt_get_rrsigs_for_name_and_type
ldns_rr_list * ldns_dnssec_pkt_get_rrsigs_for_name_and_type(const ldns_pkt *pkt, const ldns_rdf *name, ldns_rr_type type)
Returns a ldns_rr_list containing the signatures covering the given name and type.
Definition: dnssec.c:223
ldns_nsec3_algorithm
uint8_t ldns_nsec3_algorithm(const ldns_rr *nsec3_rr)
Returns the hash algorithm used in the given NSEC3 RR.
Definition: dnssec.c:1260
ldns_nsec3_optout
signed char ldns_nsec3_optout(const ldns_rr *nsec3_rr)
Returns true if the opt-out flag has been set in the given NSEC3 RR.
Definition: dnssec.c:1286
ldns_nsec_bitmap_set_type
ldns_status ldns_nsec_bitmap_set_type(ldns_rdf *bitmap, ldns_rr_type type)
Checks if RR type t is enumerated in the type bitmap rdf and sets the bit.
Definition: dnssec.c:1430
ldns_nsec3_bitmap
ldns_rdf * ldns_nsec3_bitmap(const ldns_rr *nsec3_rr)
Returns the bitmap specifying the covered types of the given NSEC3 RR.
Definition: dnssec.c:1358
ldns_key_buf2dsa_raw
DSA * ldns_key_buf2dsa_raw(const unsigned char *key, size_t len)
Like ldns_key_buf2dsa, but uses raw buffer.
Definition: dnssec.c:344
ldns_nsec_bitmap_clear_type
ldns_status ldns_nsec_bitmap_clear_type(ldns_rdf *bitmap, ldns_rr_type type)
Checks if RR type t is enumerated in the type bitmap rdf and clears the bit.
Definition: dnssec.c:1468
ldns_nsec3_hash_name_frm_nsec3
ldns_rdf * ldns_nsec3_hash_name_frm_nsec3(const ldns_rr *nsec, const ldns_rdf *name)
Calculates the hashed name using the parameters of the given NSEC3 RR.
Definition: dnssec.c:1368
ldns_pkt_verify
ldns_status ldns_pkt_verify(const ldns_pkt *p, ldns_rr_type t, const ldns_rdf *o, const ldns_rr_list *k, const ldns_rr_list *s, ldns_rr_list *good_keys)
verify a packet
Definition: dnssec.c:1626
ldns_dnssec_nsec3_closest_encloser
ldns_rdf * ldns_dnssec_nsec3_closest_encloser(const ldns_rdf *qname, ldns_rr_type qtype __attribute__((unused)), const ldns_rr_list *nsec3s)
Definition: dnssec.c:102
ldns_key_rr2ds
ldns_rr * ldns_key_rr2ds(const ldns_rr *key, ldns_hash h)
returns a new DS rr that represents the given key rr.
Definition: dnssec.c:508
ldns_dnssec_chain_nsec3_list
ldns_status ldns_dnssec_chain_nsec3_list(ldns_rr_list *nsec3_rrs)
chains nsec3 list
Definition: dnssec.c:1634
ldns_dnssec_pkt_get_rrsigs_for_type
ldns_rr_list * ldns_dnssec_pkt_get_rrsigs_for_type(const ldns_pkt *pkt, ldns_rr_type type)
Returns a ldns_rr_list containing the signatures covering the given type.
Definition: dnssec.c:250
ldns_nsec3_next_owner
ldns_rdf * ldns_nsec3_next_owner(const ldns_rr *nsec3_rr)
Returns the first label of the next ownername in the NSEC3 chain (ie.
Definition: dnssec.c:1348
ldns_key_buf2dsa
DSA * ldns_key_buf2dsa(const ldns_buffer *key)
converts a buffer holding key material to a DSA key in openssl.
Definition: dnssec.c:337
ldns_nsec3_salt
ldns_rdf * ldns_nsec3_salt(const ldns_rr *nsec3_rr)
Returns the salt used in the given NSEC3 RR.
Definition: dnssec.c:1306
ldns_nsec3_hash_name
ldns_rdf * ldns_nsec3_hash_name(const ldns_rdf *name, uint8_t algorithm, uint16_t iterations, uint8_t salt_length, const uint8_t *salt)
Calculates the hashed name using the given parameters.
Definition: dnssec.c:1008
qsort_rr_compare_nsec3
int qsort_rr_compare_nsec3(const void *a, const void *b)
compare for nsec3 sort
Definition: dnssec.c:1687
ldns_dnssec_rrsets_contains_type
int ldns_dnssec_rrsets_contains_type(const ldns_dnssec_rrsets *rrsets, ldns_rr_type type)
returns whether a rrset of the given type is found in the rrsets.
Definition: dnssec.c:801
dnssec.h
This module contains base functions for DNSSEC operations (RFC4033 t/m RFC4035).
LDNS_SIGNATURE_LEAVE_ADD_NEW
#define LDNS_SIGNATURE_LEAVE_ADD_NEW
return values for the old-signature callback
Definition: dnssec.h:47
LDNS_SIGNATURE_REMOVE_NO_ADD
#define LDNS_SIGNATURE_REMOVE_NO_ADD
Definition: dnssec.h:50
LDNS_SIGNATURE_REMOVE_ADD_NEW
#define LDNS_SIGNATURE_REMOVE_ADD_NEW
Definition: dnssec.h:49
LDNS_SIGNATURE_LEAVE_NO_ADD
#define LDNS_SIGNATURE_LEAVE_NO_ADD
Definition: dnssec.h:48
ldns_verify_time
ldns_status ldns_verify_time(const ldns_rr_list *rrset, const ldns_rr_list *rrsig, const ldns_rr_list *keys, time_t check_time, ldns_rr_list *good_keys)
Verifies a list of signatures for one rrset.
Definition: dnssec_verify.c:1098
ldns_dnssec_name_name
ldns_rdf * ldns_dnssec_name_name(const ldns_dnssec_name *name)
Returns the domain name of the given dnssec_name structure.
Definition: dnssec_zone.c:395
LDNS_STATUS_CRYPTO_ALGO_NOT_IMPL
@ LDNS_STATUS_CRYPTO_ALGO_NOT_IMPL
Definition: error.h:53
LDNS_STATUS_SSL_ERR
@ LDNS_STATUS_SSL_ERR
Definition: error.h:36
LDNS_STATUS_ERR
@ LDNS_STATUS_ERR
Definition: error.h:37
LDNS_STATUS_MEM_ERR
@ LDNS_STATUS_MEM_ERR
Definition: error.h:34
LDNS_STATUS_TYPE_NOT_IN_BITMAP
@ LDNS_STATUS_TYPE_NOT_IN_BITMAP
Definition: error.h:127
LDNS_STATUS_SYNTAX_RDATA_ERR
@ LDNS_STATUS_SYNTAX_RDATA_ERR
Definition: error.h:83
LDNS_STATUS_OK
@ LDNS_STATUS_OK
Definition: error.h:26
ldns_get_errorstr_by_id
const char * ldns_get_errorstr_by_id(ldns_status err)
look up a descriptive text by each error.
Definition: error.c:196
ldns_status
enum ldns_enum_status ldns_status
Definition: error.h:148
ldns_rdf_print
void ldns_rdf_print(FILE *output, const ldns_rdf *rdf)
Prints the data in the rdata field to the given file stream (in presentation format)
Definition: host2str.c:3394
ldns_rdf2str
char * ldns_rdf2str(const ldns_rdf *rdf)
Converts the data in the rdata field to presentation format and returns that as a char *.
Definition: host2str.c:3276
ldns_rdf2buffer_wire
ldns_status ldns_rdf2buffer_wire(ldns_buffer *output, const ldns_rdf *rdf)
Copies the rdata data to the buffer in wire format.
Definition: host2wire.c:109
ldns_rr_rdata2buffer_wire
ldns_status ldns_rr_rdata2buffer_wire(ldns_buffer *output, const ldns_rr *rr)
Converts an rr's rdata to wireformat, while excluding the ownername and all the stuff before the rdat...
Definition: host2wire.c:314
ldns_key_EVP_load_gost_id
int ldns_key_EVP_load_gost_id(void)
Get the PKEY id for GOST, loads GOST into openssl as a side effect.
LDNS_RSAMD5
@ LDNS_RSAMD5
Definition: keys.h:46
ldns_hash
enum ldns_enum_hash ldns_hash
Definition: keys.h:76
LDNS_HASH_GOST
@ LDNS_HASH_GOST
Definition: keys.h:73
LDNS_SHA256
@ LDNS_SHA256
Definition: keys.h:72
LDNS_SHA1
@ LDNS_SHA1
Definition: keys.h:71
LDNS_SHA384
@ LDNS_SHA384
Definition: keys.h:74
ldns.h
Including this file will include all ldns files, and define some lookup tables.
LDNS_MAX_PACKETLEN
#define LDNS_MAX_PACKETLEN
Definition: packet.h:24
ldns_pkt_authority
ldns_rr_list * ldns_pkt_authority(const ldns_pkt *p)
Return the packet's authority section.
Definition: packet.c:136
ldns_pkt_ancount
uint16_t ldns_pkt_ancount(const ldns_pkt *p)
Return the packet's an count.
Definition: packet.c:106
ldns_pkt_nscount
uint16_t ldns_pkt_nscount(const ldns_pkt *p)
Return the packet's ns count.
Definition: packet.c:112
ldns_pkt_answer
ldns_rr_list * ldns_pkt_answer(const ldns_pkt *p)
Return the packet's answer section.
Definition: packet.c:130
ldns_pkt_rr_list_by_type
ldns_rr_list * ldns_pkt_rr_list_by_type(const ldns_pkt *p, ldns_rr_type t, ldns_pkt_section s)
return all the rr with a specific type from a packet.
Definition: packet.c:304
ldns_pkt_rr_list_by_name_and_type
ldns_rr_list * ldns_pkt_rr_list_by_name_and_type(const ldns_pkt *packet, const ldns_rdf *ownername, ldns_rr_type type, ldns_pkt_section sec)
return all the rr with a specific type and type from a packet.
Definition: packet.c:340
LDNS_SECTION_ANY_NOQUESTION
@ LDNS_SECTION_ANY_NOQUESTION
used to get all non-question rrs from a packet
Definition: packet.h:285
ldns_rdf_get_type
ldns_rdf_type ldns_rdf_get_type(const ldns_rdf *rd)
returns the type of the rdf.
Definition: rdata.c:31
LDNS_RDF_SIZE_WORD
#define LDNS_RDF_SIZE_WORD
Definition: rdata.h:34
ldns_rdf_deep_free
void ldns_rdf_deep_free(ldns_rdf *rd)
frees a rdf structure and frees the data.
Definition: rdata.c:230
ldns_rdf_new
ldns_rdf * ldns_rdf_new(ldns_rdf_type type, size_t size, void *data)
allocates a new rdf structure and fills it.
Definition: rdata.c:179
ldns_rdf2native_int16
uint16_t ldns_rdf2native_int16(const ldns_rdf *rd)
returns the native uint16_t representation from the rdf.
Definition: rdata.c:84
ldns_native2rdf_int16
ldns_rdf * ldns_native2rdf_int16(ldns_rdf_type type, uint16_t value)
returns the rdf containing the native uint16_t representation.
Definition: rdata.c:132
ldns_rdf2native_int8
uint8_t ldns_rdf2native_int8(const ldns_rdf *rd)
returns the native uint8_t representation from the rdf.
Definition: rdata.c:70
LDNS_RDF_TYPE_B64
@ LDNS_RDF_TYPE_B64
b64 string
Definition: rdata.h:68
LDNS_RDF_TYPE_BITMAP
@ LDNS_RDF_TYPE_BITMAP
Definition: rdata.h:149
LDNS_RDF_TYPE_NSEC3_SALT
@ LDNS_RDF_TYPE_NSEC3_SALT
nsec3 hash salt
Definition: rdata.h:109
LDNS_RDF_TYPE_HEX
@ LDNS_RDF_TYPE_HEX
hex string
Definition: rdata.h:70
LDNS_RDF_TYPE_INT8
@ LDNS_RDF_TYPE_INT8
8 bits
Definition: rdata.h:52
LDNS_RDF_TYPE_INT16
@ LDNS_RDF_TYPE_INT16
16 bits
Definition: rdata.h:54
LDNS_RDF_TYPE_TYPE
@ LDNS_RDF_TYPE_TYPE
a RR type
Definition: rdata.h:74
ldns_rdf_size
size_t ldns_rdf_size(const ldns_rdf *rd)
returns the size of the rdf.
Definition: rdata.c:24
ldns_rdf_data
uint8_t * ldns_rdf_data(const ldns_rdf *rd)
returns the data of the rdf.
Definition: rdata.c:38
ldns_rdf_free
void ldns_rdf_free(ldns_rdf *rd)
frees a rdf structure, leaving the data pointer intact.
Definition: rdata.c:241
ldns_rdf_compare
int ldns_rdf_compare(const ldns_rdf *rd1, const ldns_rdf *rd2)
compares two rdf's on their wire formats.
Definition: rdata.c:657
LDNS_NSEC3_VARS_OPTOUT_MASK
#define LDNS_NSEC3_VARS_OPTOUT_MASK
Definition: rdata.h:40
ldns_rdf_clone
ldns_rdf * ldns_rdf_clone(const ldns_rdf *rd)
clones a rdf structure.
Definition: rdata.c:222
ldns_rdf_new_frm_data
ldns_rdf * ldns_rdf_new_frm_data(ldns_rdf_type type, size_t size, const void *data)
allocates a new rdf structure and fills it.
Definition: rdata.c:193
ldns_rr_list_rr
ldns_rr * ldns_rr_list_rr(const ldns_rr_list *rr_list, size_t nr)
returns a specific rr of an rrlist.
Definition: rr.c:994
ldns_rr_ttl
uint32_t ldns_rr_ttl(const ldns_rr *rr)
returns the ttl of an rr structure.
Definition: rr.c:935
ldns_rr_owner
ldns_rdf * ldns_rr_owner(const ldns_rr *rr)
returns the owner name of an rr structure.
Definition: rr.c:923
ldns_rdf2rr_type
ldns_rr_type ldns_rdf2rr_type(const ldns_rdf *rd)
convert an rdf of type LDNS_RDF_TYPE_TYPE to an actual LDNS_RR_TYPE.
Definition: rr.c:2762
ldns_rr_list_deep_free
void ldns_rr_list_deep_free(ldns_rr_list *rr_list)
frees an rr_list structure and all rrs contained therein.
Definition: rr.c:1024
ldns_rr_free
void ldns_rr_free(ldns_rr *rr)
frees an RR structure
Definition: rr.c:81
ldns_rr_set_owner
void ldns_rr_set_owner(ldns_rr *rr, ldns_rdf *owner)
sets the owner in the rr structure.
Definition: rr.c:808
ldns_rr_new_frm_type
ldns_rr * ldns_rr_new_frm_type(ldns_rr_type t)
creates a new rr structure, based on the given type.
Definition: rr.c:48
ldns_rr_type
enum ldns_enum_rr_type ldns_rr_type
Definition: rr.h:251
ldns_rr_set_type
void ldns_rr_set_type(ldns_rr *rr, ldns_rr_type rr_type)
sets the type in the rr.
Definition: rr.c:832
LDNS_RR_TYPE_RRSIG
@ LDNS_RR_TYPE_RRSIG
DNSSEC.
Definition: rr.h:170
LDNS_RR_TYPE_DNSKEY
@ LDNS_RR_TYPE_DNSKEY
Definition: rr.h:172
LDNS_RR_TYPE_SOA
@ LDNS_RR_TYPE_SOA
marks the start of a zone of authority
Definition: rr.h:90
LDNS_RR_TYPE_NSEC
@ LDNS_RR_TYPE_NSEC
Definition: rr.h:171
LDNS_RR_TYPE_DS
@ LDNS_RR_TYPE_DS
RFC4034, RFC3658.
Definition: rr.h:164
LDNS_RR_TYPE_KEY
@ LDNS_RR_TYPE_KEY
2535typecode
Definition: rr.h:128
LDNS_RR_TYPE_NSEC3PARAM
@ LDNS_RR_TYPE_NSEC3PARAM
Definition: rr.h:177
LDNS_RR_TYPE_NSEC3
@ LDNS_RR_TYPE_NSEC3
Definition: rr.h:176
LDNS_RR_TYPE_NS
@ LDNS_RR_TYPE_NS
an authoritative name server
Definition: rr.h:82
ldns_rr_set_rdf
ldns_rdf * ldns_rr_set_rdf(ldns_rr *rr, const ldns_rdf *f, size_t position)
sets a rdf member, it will be set on the position given.
Definition: rr.c:844
ldns_rr_list_rr_count
size_t ldns_rr_list_rr_count(const ldns_rr_list *rr_list)
returns the number of rr's in an rr_list.
Definition: rr.c:961
ldns_rr_get_type
ldns_rr_type ldns_rr_get_type(const ldns_rr *rr)
returns the type of the rr.
Definition: rr.c:947
ldns_rr_set_ttl
void ldns_rr_set_ttl(ldns_rr *rr, uint32_t ttl)
sets the ttl in the rr structure.
Definition: rr.c:820
ldns_rr_get_class
ldns_rr_class ldns_rr_get_class(const ldns_rr *rr)
returns the class of the rr.
Definition: rr.c:953
ldns_rr_set_class
void ldns_rr_set_class(ldns_rr *rr, ldns_rr_class rr_class)
sets the class in the rr.
Definition: rr.c:838
ldns_rr_list_subtype_by_rdf
ldns_rr_list * ldns_rr_list_subtype_by_rdf(const ldns_rr_list *l, const ldns_rdf *r, size_t pos)
Return the rr_list which matches the rdf at position field.
Definition: rr.c:1102
ldns_rr_push_rdf
signed char ldns_rr_push_rdf(ldns_rr *rr, const ldns_rdf *f)
sets rd_field member, it will be placed in the next available spot.
Definition: rr.c:861
ldns_rr_rdf
ldns_rdf * ldns_rr_rdf(const ldns_rr *rr, size_t nr)
returns the rdata field member counter.
Definition: rr.c:913
ldns_rr_new
ldns_rr * ldns_rr_new(void)
creates a new rr structure.
Definition: rr.c:30
ldns_rr_rrsig_keytag
ldns_rdf * ldns_rr_rrsig_keytag(const ldns_rr *r)
returns the keytag of a LDNS_RR_TYPE_RRSIG RR
Definition: rr_functions.c:183
ldns_rr_rrsig_typecovered
ldns_rdf * ldns_rr_rrsig_typecovered(const ldns_rr *r)
returns the type covered of a LDNS_RR_TYPE_RRSIG rr
Definition: rr_functions.c:111
ldns_rr_rrsig_signame
ldns_rdf * ldns_rr_rrsig_signame(const ldns_rr *r)
returns the signers name of a LDNS_RR_TYPE_RRSIG RR
Definition: rr_functions.c:195
LDNS_SHA1_DIGEST_LENGTH
#define LDNS_SHA1_DIGEST_LENGTH
Definition: sha1.h:16
ldns_sha1
unsigned char * ldns_sha1(const unsigned char *data, unsigned int data_len, unsigned char *digest)
Convenience function to digest a fixed block of data at once.
Definition: sha1.c:171
R
#define R(b, x)
Definition: sha2.c:191
ldns_sha256
unsigned char * ldns_sha256(const unsigned char *data, unsigned int data_len, unsigned char *digest)
Convenience function to digest a fixed block of data at once.
Definition: sha2.c:624
LDNS_SHA256_DIGEST_LENGTH
#define LDNS_SHA256_DIGEST_LENGTH
Definition: sha2.h:63
ldns_str2rdf_b32_ext
ldns_status ldns_str2rdf_b32_ext(ldns_rdf **rd, const char *str)
convert the string with the b32 ext hex data into wireformat
Definition: str2host.c:613
ldns_str2rdf_dname
ldns_status ldns_str2rdf_dname(ldns_rdf **rd, const char *str)
convert a dname string into wireformat
Definition: str2host.c:311
ldns_struct_buffer
implementation of buffers to ease operations
Definition: buffer.h:51
ldns_struct_dnssec_name
Definition: dnssec_zone.h:46
ldns_struct_dnssec_name::hashed_name
ldns_rdf * hashed_name
pointer to store the hashed name (only used when in an NSEC3 zone
Definition: dnssec_zone.h:85
ldns_struct_dnssec_name::rrsets
ldns_dnssec_rrsets * rrsets
The rrsets for this name.
Definition: dnssec_zone.h:63
ldns_struct_dnssec_rrsets
Definition: dnssec_zone.h:33
ldns_struct_dnssec_rrsets::type
ldns_rr_type type
Definition: dnssec_zone.h:35
ldns_struct_dnssec_rrsets::next
ldns_dnssec_rrsets * next
Definition: dnssec_zone.h:37
ldns_struct_pkt
DNS packet.
Definition: packet.h:235
ldns_struct_rdf
Resource record data field.
Definition: rdata.h:197
ldns_struct_rr_list
List or Set of Resource Records.
Definition: rr.h:346
ldns_struct_rr_list::_rrs
ldns_rr ** _rrs
Definition: rr.h:349
ldns_struct_rr
Resource Record.
Definition: rr.h:318
ldns_b32_ntop_extended_hex
int ldns_b32_ntop_extended_hex(const uint8_t *src_data, size_t src_data_length, char *target_text_buffer, size_t target_text_buffer_size)
Definition: util.c:606
LDNS_FREE
#define LDNS_FREE(ptr)
Definition: util.h:60
LDNS_CALLOC
#define LDNS_CALLOC(type, count)
Definition: util.h:53
LDNS_XMALLOC
#define LDNS_XMALLOC(type, count)
Definition: util.h:51