2 * dnssec.h -- defines for the Domain Name System (SEC) (DNSSEC)
4 * Copyright (c) 2005-2008, NLnet Labs. All rights reserved.
6 * See LICENSE for the license.
8 * A bunch of defines that are used in the DNS
14 * This module contains base functions for DNSSEC operations
15 * (RFC4033 t/m RFC4035).
17 * Since those functions heavily rely op cryptographic operations,
18 * this module is dependent on openssl.
26 #include <ldns/common.h>
27 #if LDNS_BUILD_CONFIG_HAVE_SSL
28 #include <openssl/ssl.h>
29 #include <openssl/evp.h>
30 #endif /* LDNS_BUILD_CONFIG_HAVE_SSL */
31 #include <ldns/packet.h>
32 #include <ldns/keys.h>
33 #include <ldns/zone.h>
34 #include <ldns/resolver.h>
35 #include <ldns/dnssec_zone.h>
41 #define LDNS_MAX_KEYLEN 2048
42 #define LDNS_DNSSEC_KEYPROTO 3
43 /* default time before sigs expire */
44 #define LDNS_DEFAULT_EXP_TIME 2419200 /* 4 weeks */
46 /** return values for the old-signature callback */
47 #define LDNS_SIGNATURE_LEAVE_ADD_NEW 0
48 #define LDNS_SIGNATURE_LEAVE_NO_ADD 1
49 #define LDNS_SIGNATURE_REMOVE_ADD_NEW 2
50 #define LDNS_SIGNATURE_REMOVE_NO_ADD 3
53 * Returns the first RRSIG rr that corresponds to the rrset
54 * with the given name and type
56 * \param[in] name The dname of the RRset covered by the RRSIG to find
57 * \param[in] type The type of the RRset covered by the RRSIG to find
58 * \param[in] rrs List of rrs to search in
59 * \returns Pointer to the first RRsig ldns_rr found, or NULL if it is
62 ldns_rr *ldns_dnssec_get_rrsig_for_name_and_type(const ldns_rdf *name,
63 const ldns_rr_type type,
64 const ldns_rr_list *rrs);
67 * Returns the DNSKEY that corresponds to the given RRSIG rr from the list, if
70 * \param[in] rrsig The rrsig to find the DNSKEY for
71 * \param[in] rrs The rr list to find the key in
72 * \return The DNSKEY that corresponds to the given RRSIG, or NULL if it was
75 ldns_rr *ldns_dnssec_get_dnskey_for_rrsig(const ldns_rr *rrsig, const ldns_rr_list *rrs);
78 * Returns the rdata field that contains the bitmap of the covered types of
79 * the given NSEC record
81 * \param[in] nsec The nsec to get the covered type bitmap of
82 * \return An ldns_rdf containing the bitmap, or NULL on error
84 ldns_rdf *ldns_nsec_get_bitmap(ldns_rr *nsec);
87 #define LDNS_NSEC3_MAX_ITERATIONS 65535
90 * Returns the dname of the closest (provable) encloser
93 ldns_dnssec_nsec3_closest_encloser(ldns_rdf *qname,
95 ldns_rr_list *nsec3s);
98 * Checks whether the packet contains rrsigs
101 ldns_dnssec_pkt_has_rrsigs(const ldns_pkt *pkt);
104 * Returns a ldns_rr_list containing the signatures covering the given name
107 ldns_rr_list *ldns_dnssec_pkt_get_rrsigs_for_name_and_type(const ldns_pkt *pkt, ldns_rdf *name, ldns_rr_type type);
110 * Returns a ldns_rr_list containing the signatures covering the given type
112 ldns_rr_list *ldns_dnssec_pkt_get_rrsigs_for_type(const ldns_pkt *pkt, ldns_rr_type type);
115 * calculates a keytag of a key for use in DNSSEC.
117 * \param[in] key the key as an RR to use for the calc.
120 uint16_t ldns_calc_keytag(const ldns_rr *key);
123 * Calculates keytag of DNSSEC key, operates on wireformat rdata.
124 * \param[in] key the key as uncompressed wireformat rdata.
125 * \param[in] keysize length of key data.
128 uint16_t ldns_calc_keytag_raw(uint8_t* key, size_t keysize);
130 #if LDNS_BUILD_CONFIG_HAVE_SSL
132 * converts a buffer holding key material to a DSA key in openssl.
134 * \param[in] key the key to convert
135 * \return a DSA * structure with the key material
137 DSA *ldns_key_buf2dsa(ldns_buffer *key);
139 * Like ldns_key_buf2dsa, but uses raw buffer.
140 * \param[in] key the uncompressed wireformat of the key.
141 * \param[in] len length of key data
142 * \return a DSA * structure with the key material
144 DSA *ldns_key_buf2dsa_raw(unsigned char* key, size_t len);
147 * Utility function to calculate hash using generic EVP_MD pointer.
148 * \param[in] data the data to hash.
149 * \param[in] len length of data.
150 * \param[out] dest the destination of the hash, must be large enough.
151 * \param[in] md the message digest to use.
152 * \return true if worked, false on failure.
154 int ldns_digest_evp(unsigned char* data, unsigned int len,
155 unsigned char* dest, const EVP_MD* md);
158 * Converts a holding buffer with key material to EVP PKEY in openssl.
159 * Only available if ldns was compiled with GOST.
160 * \param[in] key data to convert
161 * \param[in] keylen length of the key data
162 * \return the key or NULL on error.
164 EVP_PKEY* ldns_gost2pkey_raw(unsigned char* key, size_t keylen);
167 * Converts a holding buffer with key material to EVP PKEY in openssl.
168 * Only available if ldns was compiled with ECDSA.
169 * \param[in] key data to convert
170 * \param[in] keylen length of the key data
171 * \param[in] algo precise algorithm to initialize ECC group values.
172 * \return the key or NULL on error.
174 EVP_PKEY* ldns_ecdsa2pkey_raw(unsigned char* key, size_t keylen, uint8_t algo);
176 #endif /* LDNS_BUILD_CONFIG_HAVE_SSL */
178 #if LDNS_BUILD_CONFIG_HAVE_SSL
180 * converts a buffer holding key material to a RSA key in openssl.
182 * \param[in] key the key to convert
183 * \return a RSA * structure with the key material
185 RSA *ldns_key_buf2rsa(ldns_buffer *key);
188 * Like ldns_key_buf2rsa, but uses raw buffer.
189 * \param[in] key the uncompressed wireformat of the key.
190 * \param[in] len length of key data
191 * \return a RSA * structure with the key material
193 RSA *ldns_key_buf2rsa_raw(unsigned char* key, size_t len);
194 #endif /* LDNS_BUILD_CONFIG_HAVE_SSL */
197 * returns a new DS rr that represents the given key rr.
199 * \param[in] *key the key to convert
200 * \param[in] h the hash to use LDNS_SHA1/LDNS_SHA256
202 * \return ldns_rr* a new rr pointer to a DS
204 ldns_rr *ldns_key_rr2ds(const ldns_rr *key, ldns_hash h);
207 * Create the type bitmap for an NSEC(3) record
210 ldns_dnssec_create_nsec_bitmap(ldns_rr_type rr_type_list[],
212 ldns_rr_type nsec_type);
215 * returns whether a rrset of the given type is found in the rrsets.
217 * \param[in] rrsets the rrsets to be tested
218 * \param[in] type the type to test for
219 * \return int 1 if the type was found, 0 otherwise.
222 ldns_dnssec_rrsets_contains_type (ldns_dnssec_rrsets *rrsets, ldns_rr_type type);
228 ldns_dnssec_create_nsec(ldns_dnssec_name *from,
229 ldns_dnssec_name *to,
230 ldns_rr_type nsec_type);
237 ldns_dnssec_create_nsec3(ldns_dnssec_name *from,
238 ldns_dnssec_name *to,
247 * Create a NSEC record
248 * \param[in] cur_owner the current owner which should be taken as the starting point
249 * \param[in] next_owner the rrlist which the nsec rr should point to
250 * \param[in] rrs all rrs from the zone, to find all RR types of cur_owner in
251 * \return a ldns_rr with the nsec record in it
253 ldns_rr * ldns_create_nsec(ldns_rdf *cur_owner, ldns_rdf *next_owner, ldns_rr_list *rrs);
256 * Calculates the hashed name using the given parameters
257 * \param[in] *name The owner name to calculate the hash for
258 * \param[in] algorithm The hash algorithm to use
259 * \param[in] iterations The number of hash iterations to use
260 * \param[in] salt_length The length of the salt in bytes
261 * \param[in] salt The salt to use
262 * \return The hashed owner name rdf, without the domain name
264 ldns_rdf *ldns_nsec3_hash_name(ldns_rdf *name, uint8_t algorithm, uint16_t iterations, uint8_t salt_length, uint8_t *salt);
267 * Sets all the NSEC3 options. The rr to set them in must be initialized with _new() and
268 * type LDNS_RR_TYPE_NSEC3
269 * \param[in] *rr The RR to set the values in
270 * \param[in] algorithm The NSEC3 hash algorithm
271 * \param[in] flags The flags field
272 * \param[in] iterations The number of hash iterations
273 * \param[in] salt_length The length of the salt in bytes
274 * \param[in] salt The salt bytes
276 void ldns_nsec3_add_param_rdfs(ldns_rr *rr,
283 /* this will NOT return the NSEC3 completed, you will have to run the
284 finalize function on the rrlist later! */
286 ldns_create_nsec3(ldns_rdf *cur_owner,
294 bool emptynonterminal);
297 * Returns the hash algorithm used in the given NSEC3 RR
298 * \param[in] *nsec3_rr The RR to read from
299 * \return The algorithm identifier, or 0 on error
301 uint8_t ldns_nsec3_algorithm(const ldns_rr *nsec3_rr);
304 * Returns flags field
307 ldns_nsec3_flags(const ldns_rr *nsec3_rr);
310 * Returns true if the opt-out flag has been set in the given NSEC3 RR
311 * \param[in] *nsec3_rr The RR to read from
312 * \return true if the RR has type NSEC3 and the opt-out bit has been set, false otherwise
314 bool ldns_nsec3_optout(const ldns_rr *nsec3_rr);
317 * Returns the number of hash iterations used in the given NSEC3 RR
318 * \param[in] *nsec3_rr The RR to read from
319 * \return The number of iterations
321 uint16_t ldns_nsec3_iterations(const ldns_rr *nsec3_rr);
324 * Returns the salt used in the given NSEC3 RR
325 * \param[in] *nsec3_rr The RR to read from
326 * \return The salt rdf, or NULL on error
328 ldns_rdf *ldns_nsec3_salt(const ldns_rr *nsec3_rr);
331 * Returns the length of the salt used in the given NSEC3 RR
332 * \param[in] *nsec3_rr The RR to read from
333 * \return The length of the salt in bytes
335 uint8_t ldns_nsec3_salt_length(const ldns_rr *nsec3_rr);
338 * Returns the salt bytes used in the given NSEC3 RR
339 * \param[in] *nsec3_rr The RR to read from
340 * \return The salt in bytes, this is alloced, so you need to free it
342 uint8_t *ldns_nsec3_salt_data(const ldns_rr *nsec3_rr);
345 * Returns the first label of the next ownername in the NSEC3 chain (ie. without the domain)
346 * \param[in] nsec3_rr The RR to read from
347 * \return The first label of the next owner name in the NSEC3 chain, or NULL on error
349 ldns_rdf *ldns_nsec3_next_owner(const ldns_rr *nsec3_rr);
352 * Returns the bitmap specifying the covered types of the given NSEC3 RR
353 * \param[in] *nsec3_rr The RR to read from
354 * \return The covered type bitmap rdf
356 ldns_rdf *ldns_nsec3_bitmap(const ldns_rr *nsec3_rr);
359 * Calculates the hashed name using the parameters of the given NSEC3 RR
360 * \param[in] *nsec The RR to use the parameters from
361 * \param[in] *name The owner name to calculate the hash for
362 * \return The hashed owner name rdf, without the domain name
364 ldns_rdf *ldns_nsec3_hash_name_frm_nsec3(const ldns_rr *nsec, ldns_rdf *name);
367 * Checks coverage of NSEC RR type bitmap
368 * \param[in] nsec_bitmap The NSEC bitmap rdata field to check
369 * \param[in] type The type to check
370 * \return true if the NSEC RR covers the type
372 bool ldns_nsec_bitmap_covers_type(const ldns_rdf *nsec_bitmap, ldns_rr_type type);
375 * Checks coverage of NSEC(3) RR name span
376 * Remember that nsec and name must both be in canonical form (ie use
377 * \ref ldns_rr2canonical and \ref ldns_dname2canonical prior to calling this
380 * \param[in] nsec The NSEC RR to check
381 * \param[in] name The owner dname to check, if the nsec record is a NSEC3 record, this should be the hashed name
382 * \return true if the NSEC RR covers the owner name
384 bool ldns_nsec_covers_name(const ldns_rr *nsec, const ldns_rdf *name);
386 #if LDNS_BUILD_CONFIG_HAVE_SSL
389 * \param[in] p the packet
390 * \param[in] t the rr set type to check
391 * \param[in] o the rr set name to check
392 * \param[in] k list of keys
393 * \param[in] s list of sigs (may be null)
394 * \param[out] good_keys keys which validated the packet
398 ldns_status ldns_pkt_verify(ldns_pkt *p, ldns_rr_type t, ldns_rdf *o, ldns_rr_list *k, ldns_rr_list *s, ldns_rr_list *good_keys);
402 * \param[in] p the packet
403 * \param[in] t the rr set type to check
404 * \param[in] o the rr set name to check
405 * \param[in] k list of keys
406 * \param[in] s list of sigs (may be null)
407 * \param[in] check_time the time for which the validation is performed
408 * \param[out] good_keys keys which validated the packet
412 ldns_status ldns_pkt_verify_time(ldns_pkt *p, ldns_rr_type t, ldns_rdf *o, ldns_rr_list *k, ldns_rr_list *s, time_t check_time, ldns_rr_list *good_keys);
420 ldns_dnssec_chain_nsec3_list(ldns_rr_list *nsec3_rrs);
423 * compare for nsec3 sort
426 qsort_rr_compare_nsec3(const void *a, const void *b);
432 ldns_rr_list_sort_nsec3(ldns_rr_list *unsorted);
435 * Default callback function to always leave present signatures, and
437 * \param[in] sig The signature to check for removal (unused)
438 * \param[in] n Optional argument (unused)
439 * \return LDNS_SIGNATURE_LEAVE_ADD_NEW
441 int ldns_dnssec_default_add_to_signatures(ldns_rr *sig, void *n);
443 * Default callback function to always leave present signatures, and
444 * add no new ones for the keys of these signatures
445 * \param[in] sig The signature to check for removal (unused)
446 * \param[in] n Optional argument (unused)
447 * \return LDNS_SIGNATURE_LEAVE_NO_ADD
449 int ldns_dnssec_default_leave_signatures(ldns_rr *sig, void *n);
451 * Default callback function to always remove present signatures, but
453 * \param[in] sig The signature to check for removal (unused)
454 * \param[in] n Optional argument (unused)
455 * \return LDNS_SIGNATURE_REMOVE_NO_ADD
457 int ldns_dnssec_default_delete_signatures(ldns_rr *sig, void *n);
459 * Default callback function to always leave present signatures, and
461 * \param[in] sig The signature to check for removal (unused)
462 * \param[in] n Optional argument (unused)
463 * \return LDNS_SIGNATURE_REMOVE_ADD_NEW
465 int ldns_dnssec_default_replace_signatures(ldns_rr *sig, void *n);
467 #if LDNS_BUILD_CONFIG_HAVE_SSL
469 * Converts the DSA signature from ASN1 representation (RFC2459, as
470 * used by OpenSSL) to raw signature data as used in DNS (rfc2536)
472 * \param[in] sig The signature in RFC2459 format
473 * \param[in] sig_len The length of the signature
474 * \return a new rdf with the signature
477 ldns_convert_dsa_rrsig_asn12rdf(const ldns_buffer *sig,
481 * Converts the RRSIG signature RDF (in rfc2536 format) to a buffer
482 * with the signature in rfc2459 format
484 * \param[out] target_buffer buffer to place the signature data
485 * \param[in] sig_rdf The signature rdf to convert
486 * \return LDNS_STATUS_OK on success, error code otherwise
489 ldns_convert_dsa_rrsig_rdf2asn1(ldns_buffer *target_buffer,
490 const ldns_rdf *sig_rdf);
493 * Converts the ECDSA signature from ASN1 representation (as
494 * used by OpenSSL) to raw signature data as used in DNS
495 * This routine is only present if ldns is compiled with ecdsa support.
497 * \param[in] sig The signature in ASN1 format
498 * \param[in] sig_len The length of the signature
499 * \return a new rdf with the signature
502 ldns_convert_ecdsa_rrsig_asn12rdf(const ldns_buffer *sig, const long sig_len);
505 * Converts the RRSIG signature RDF (from DNS) to a buffer with the
506 * signature in ASN1 format as openssl uses it.
507 * This routine is only present if ldns is compiled with ecdsa support.
509 * \param[out] target_buffer buffer to place the signature data in ASN1.
510 * \param[in] sig_rdf The signature rdf to convert
511 * \return LDNS_STATUS_OK on success, error code otherwise
514 ldns_convert_ecdsa_rrsig_rdf2asn1(ldns_buffer *target_buffer,
515 const ldns_rdf *sig_rdf);
517 #endif /* LDNS_BUILD_CONFIG_HAVE_SSL */
523 #endif /* LDNS_DNSSEC_H */