dnssec.c
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00001 /*
00002  * dnssec.c
00003  *
00004  * contains the cryptographic function needed for DNSSEC in ldns
00005  * The crypto library used is openssl
00006  *
00007  * (c) NLnet Labs, 2004-2008
00008  *
00009  * See the file LICENSE for the license
00010  */
00011 
00012 #include <ldns/config.h>
00013 
00014 #include <ldns/ldns.h>
00015 #include <ldns/dnssec.h>
00016 
00017 #include <strings.h>
00018 #include <time.h>
00019 
00020 #ifdef HAVE_SSL
00021 #include <openssl/ssl.h>
00022 #include <openssl/evp.h>
00023 #include <openssl/rand.h>
00024 #include <openssl/err.h>
00025 #include <openssl/md5.h>
00026 #endif
00027 
00028 ldns_rr *
00029 ldns_dnssec_get_rrsig_for_name_and_type(const ldns_rdf *name,
00030                                         const ldns_rr_type type,
00031                                         const ldns_rr_list *rrs)
00032 {
00033         size_t i;
00034         ldns_rr *candidate;
00035 
00036         if (!name || !rrs) {
00037                 return NULL;
00038         }
00039 
00040         for (i = 0; i < ldns_rr_list_rr_count(rrs); i++) {
00041                 candidate = ldns_rr_list_rr(rrs, i);
00042                 if (ldns_rr_get_type(candidate) == LDNS_RR_TYPE_RRSIG) {
00043                         if (ldns_dname_compare(ldns_rr_owner(candidate),
00044                                                name) == 0 &&
00045                             ldns_rdf2rr_type(ldns_rr_rrsig_typecovered(candidate))
00046                             == type
00047                             ) {
00048                                 return candidate;
00049                         }
00050                 }
00051         }
00052 
00053         return NULL;
00054 }
00055 
00056 ldns_rr *
00057 ldns_dnssec_get_dnskey_for_rrsig(const ldns_rr *rrsig,
00058                                                    const ldns_rr_list *rrs)
00059 {
00060         size_t i;
00061         ldns_rr *candidate;
00062 
00063         if (!rrsig || !rrs) {
00064                 return NULL;
00065         }
00066 
00067         for (i = 0; i < ldns_rr_list_rr_count(rrs); i++) {
00068                 candidate = ldns_rr_list_rr(rrs, i);
00069                 if (ldns_rr_get_type(candidate) == LDNS_RR_TYPE_DNSKEY) {
00070                         if (ldns_dname_compare(ldns_rr_owner(candidate),
00071                                                ldns_rr_rrsig_signame(rrsig)) == 0 &&
00072                             ldns_rdf2native_int16(ldns_rr_rrsig_keytag(rrsig)) ==
00073                             ldns_calc_keytag(candidate)
00074                             ) {
00075                                 return candidate;
00076                         }
00077                 }
00078         }
00079 
00080         return NULL;
00081 }
00082 
00083 ldns_rdf *
00084 ldns_nsec_get_bitmap(ldns_rr *nsec) {
00085         if (ldns_rr_get_type(nsec) == LDNS_RR_TYPE_NSEC) {
00086                 return ldns_rr_rdf(nsec, 1);
00087         } else if (ldns_rr_get_type(nsec) == LDNS_RR_TYPE_NSEC3) {
00088                 return ldns_rr_rdf(nsec, 5);
00089         } else {
00090                 return NULL;
00091         }
00092 }
00093 
00094 /*return the owner name of the closest encloser for name from the list of rrs */
00095 /* this is NOT the hash, but the original name! */
00096 ldns_rdf *
00097 ldns_dnssec_nsec3_closest_encloser(ldns_rdf *qname,
00098                                    ATTR_UNUSED(ldns_rr_type qtype),
00099                                    ldns_rr_list *nsec3s)
00100 {
00101         /* remember parameters, they must match */
00102         uint8_t algorithm;
00103         uint32_t iterations;
00104         uint8_t salt_length;
00105         uint8_t *salt;
00106 
00107         ldns_rdf *sname, *hashed_sname, *tmp;
00108         bool flag;
00109 
00110         bool exact_match_found;
00111         bool in_range_found;
00112 
00113         ldns_status status;
00114         ldns_rdf *zone_name;
00115 
00116         size_t nsec_i;
00117         ldns_rr *nsec;
00118         ldns_rdf *result = NULL;
00119 
00120         if (!qname || !nsec3s || ldns_rr_list_rr_count(nsec3s) < 1) {
00121                 return NULL;
00122         }
00123 
00124         nsec = ldns_rr_list_rr(nsec3s, 0);
00125         algorithm = ldns_nsec3_algorithm(nsec);
00126         salt_length = ldns_nsec3_salt_length(nsec);
00127         salt = ldns_nsec3_salt_data(nsec);
00128         iterations = ldns_nsec3_iterations(nsec);
00129 
00130         sname = ldns_rdf_clone(qname);
00131 
00132         flag = false;
00133 
00134         zone_name = ldns_dname_left_chop(ldns_rr_owner(nsec));
00135 
00136         /* algorithm from nsec3-07 8.3 */
00137         while (ldns_dname_label_count(sname) > 0) {
00138                 exact_match_found = false;
00139                 in_range_found = false;
00140 
00141                 hashed_sname = ldns_nsec3_hash_name(sname,
00142                                                                          algorithm,
00143                                                                          iterations,
00144                                                                          salt_length,
00145                                                                          salt);
00146 
00147                 status = ldns_dname_cat(hashed_sname, zone_name);
00148                 if(status != LDNS_STATUS_OK) {
00149                         LDNS_FREE(salt);
00150                         ldns_rdf_deep_free(zone_name);
00151                         ldns_rdf_deep_free(sname);
00152                         return NULL;
00153                 }
00154 
00155                 for (nsec_i = 0; nsec_i < ldns_rr_list_rr_count(nsec3s); nsec_i++) {
00156                         nsec = ldns_rr_list_rr(nsec3s, nsec_i);
00157 
00158                         /* check values of iterations etc! */
00159 
00160                         /* exact match? */
00161                         if (ldns_dname_compare(ldns_rr_owner(nsec), hashed_sname) == 0) {
00162                                 exact_match_found = true;
00163                         } else if (ldns_nsec_covers_name(nsec, hashed_sname)) {
00164                                 in_range_found = true;
00165                         }
00166 
00167                 }
00168                 if (!exact_match_found && in_range_found) {
00169                         flag = true;
00170                 } else if (exact_match_found && flag) {
00171                         result = ldns_rdf_clone(sname);
00172                         /* RFC 5155: 8.3. 2.** "The proof is complete" */
00173                         ldns_rdf_deep_free(hashed_sname);
00174                         goto done;
00175                 } else if (exact_match_found && !flag) {
00176                         /* error! */
00177                         ldns_rdf_deep_free(hashed_sname);
00178                         goto done;
00179                 } else {
00180                         flag = false;
00181                 }
00182 
00183                 ldns_rdf_deep_free(hashed_sname);
00184                 tmp = sname;
00185                 sname = ldns_dname_left_chop(sname);
00186                 ldns_rdf_deep_free(tmp);
00187         }
00188 
00189         done:
00190         LDNS_FREE(salt);
00191         ldns_rdf_deep_free(zone_name);
00192         ldns_rdf_deep_free(sname);
00193 
00194         return result;
00195 }
00196 
00197 bool
00198 ldns_dnssec_pkt_has_rrsigs(const ldns_pkt *pkt)
00199 {
00200         size_t i;
00201         for (i = 0; i < ldns_pkt_ancount(pkt); i++) {
00202                 if (ldns_rr_get_type(ldns_rr_list_rr(ldns_pkt_answer(pkt), i)) ==
00203                     LDNS_RR_TYPE_RRSIG) {
00204                         return true;
00205                 }
00206         }
00207         for (i = 0; i < ldns_pkt_nscount(pkt); i++) {
00208                 if (ldns_rr_get_type(ldns_rr_list_rr(ldns_pkt_authority(pkt), i)) ==
00209                     LDNS_RR_TYPE_RRSIG) {
00210                         return true;
00211                 }
00212         }
00213         return false;
00214 }
00215 
00216 ldns_rr_list *
00217 ldns_dnssec_pkt_get_rrsigs_for_name_and_type(const ldns_pkt *pkt,
00218                                                                         ldns_rdf *name,
00219                                                                         ldns_rr_type type)
00220 {
00221         uint16_t t_netorder;
00222         ldns_rr_list *sigs;
00223         ldns_rr_list *sigs_covered;
00224         ldns_rdf *rdf_t;
00225         
00226         sigs = ldns_pkt_rr_list_by_name_and_type(pkt,
00227                                                                          name,
00228                                                                          LDNS_RR_TYPE_RRSIG,
00229                                                                          LDNS_SECTION_ANY_NOQUESTION
00230                                                                          );
00231 
00232         t_netorder = htons(type); /* rdf are in network order! */
00233         rdf_t = ldns_rdf_new(LDNS_RDF_TYPE_TYPE, LDNS_RDF_SIZE_WORD, &t_netorder);
00234         sigs_covered = ldns_rr_list_subtype_by_rdf(sigs, rdf_t, 0);
00235         
00236         ldns_rdf_free(rdf_t);
00237         ldns_rr_list_deep_free(sigs);
00238 
00239         return sigs_covered;
00240 
00241 }
00242 
00243 ldns_rr_list *
00244 ldns_dnssec_pkt_get_rrsigs_for_type(const ldns_pkt *pkt, ldns_rr_type type)
00245 {
00246         uint16_t t_netorder;
00247         ldns_rr_list *sigs;
00248         ldns_rr_list *sigs_covered;
00249         ldns_rdf *rdf_t;
00250 
00251         sigs = ldns_pkt_rr_list_by_type(pkt,
00252                                         LDNS_RR_TYPE_RRSIG,
00253                                         LDNS_SECTION_ANY_NOQUESTION
00254                                                           );
00255 
00256         t_netorder = htons(type); /* rdf are in network order! */
00257         rdf_t = ldns_rdf_new(LDNS_RDF_TYPE_TYPE,
00258                                          2,
00259                                          &t_netorder);
00260         sigs_covered = ldns_rr_list_subtype_by_rdf(sigs, rdf_t, 0);
00261 
00262         ldns_rdf_free(rdf_t);
00263         ldns_rr_list_deep_free(sigs);
00264 
00265         return sigs_covered;
00266 
00267 }
00268 
00269 /* used only on the public key RR */
00270 uint16_t
00271 ldns_calc_keytag(const ldns_rr *key)
00272 {
00273         uint16_t ac16;
00274         ldns_buffer *keybuf;
00275         size_t keysize;
00276 
00277         if (!key) {
00278                 return 0;
00279         }
00280 
00281         if (ldns_rr_get_type(key) != LDNS_RR_TYPE_DNSKEY &&
00282             ldns_rr_get_type(key) != LDNS_RR_TYPE_KEY
00283             ) {
00284                 return 0;
00285         }
00286 
00287         /* rdata to buf - only put the rdata in a buffer */
00288         keybuf = ldns_buffer_new(LDNS_MIN_BUFLEN); /* grows */
00289         if (!keybuf) {
00290                 return 0;
00291         }
00292         (void)ldns_rr_rdata2buffer_wire(keybuf, key);
00293         /* the current pos in the buffer is the keysize */
00294         keysize= ldns_buffer_position(keybuf);
00295 
00296         ac16 = ldns_calc_keytag_raw(ldns_buffer_begin(keybuf), keysize);
00297         ldns_buffer_free(keybuf);
00298         return ac16;
00299 }
00300 
00301 uint16_t ldns_calc_keytag_raw(uint8_t* key, size_t keysize)
00302 {
00303         unsigned int i;
00304         uint32_t ac32;
00305         uint16_t ac16;
00306 
00307         if(keysize < 4) {
00308                 return 0;
00309         }
00310         /* look at the algorithm field, copied from 2535bis */
00311         if (key[3] == LDNS_RSAMD5) {
00312                 ac16 = 0;
00313                 if (keysize > 4) {
00314                         memmove(&ac16, key + keysize - 3, 2);
00315                 }
00316                 ac16 = ntohs(ac16);
00317                 return (uint16_t) ac16;
00318         } else {
00319                 ac32 = 0;
00320                 for (i = 0; (size_t)i < keysize; ++i) {
00321                         ac32 += (i & 1) ? key[i] : key[i] << 8;
00322                 }
00323                 ac32 += (ac32 >> 16) & 0xFFFF;
00324                 return (uint16_t) (ac32 & 0xFFFF);
00325         }
00326 }
00327 
00328 #ifdef HAVE_SSL
00329 DSA *
00330 ldns_key_buf2dsa(ldns_buffer *key)
00331 {
00332         return ldns_key_buf2dsa_raw((unsigned char*)ldns_buffer_begin(key),
00333                                                    ldns_buffer_position(key));
00334 }
00335 
00336 DSA *
00337 ldns_key_buf2dsa_raw(unsigned char* key, size_t len)
00338 {
00339         uint8_t T;
00340         uint16_t length;
00341         uint16_t offset;
00342         DSA *dsa;
00343         BIGNUM *Q; BIGNUM *P;
00344         BIGNUM *G; BIGNUM *Y;
00345 
00346         if(len == 0)
00347                 return NULL;
00348         T = (uint8_t)key[0];
00349         length = (64 + T * 8);
00350         offset = 1;
00351 
00352         if (T > 8) {
00353                 return NULL;
00354         }
00355         if(len < (size_t)1 + SHA_DIGEST_LENGTH + 3*length)
00356                 return NULL;
00357 
00358         Q = BN_bin2bn(key+offset, SHA_DIGEST_LENGTH, NULL);
00359         offset += SHA_DIGEST_LENGTH;
00360 
00361         P = BN_bin2bn(key+offset, (int)length, NULL);
00362         offset += length;
00363 
00364         G = BN_bin2bn(key+offset, (int)length, NULL);
00365         offset += length;
00366 
00367         Y = BN_bin2bn(key+offset, (int)length, NULL);
00368         offset += length;
00369 
00370         /* create the key and set its properties */
00371         if(!Q || !P || !G || !Y || !(dsa = DSA_new())) {
00372                 BN_free(Q);
00373                 BN_free(P);
00374                 BN_free(G);
00375                 BN_free(Y);
00376                 return NULL;
00377         }
00378 #ifndef S_SPLINT_S
00379         dsa->p = P;
00380         dsa->q = Q;
00381         dsa->g = G;
00382         dsa->pub_key = Y;
00383 #endif /* splint */
00384 
00385         return dsa;
00386 }
00387 
00388 RSA *
00389 ldns_key_buf2rsa(ldns_buffer *key)
00390 {
00391         return ldns_key_buf2rsa_raw((unsigned char*)ldns_buffer_begin(key),
00392                                                    ldns_buffer_position(key));
00393 }
00394 
00395 RSA *
00396 ldns_key_buf2rsa_raw(unsigned char* key, size_t len)
00397 {
00398         uint16_t offset;
00399         uint16_t exp;
00400         uint16_t int16;
00401         RSA *rsa;
00402         BIGNUM *modulus;
00403         BIGNUM *exponent;
00404 
00405         if (len == 0)
00406                 return NULL;
00407         if (key[0] == 0) {
00408                 if(len < 3)
00409                         return NULL;
00410                 /* need some smart comment here XXX*/
00411                 /* the exponent is too large so it's places
00412                  * futher...???? */
00413                 memmove(&int16, key+1, 2);
00414                 exp = ntohs(int16);
00415                 offset = 3;
00416         } else {
00417                 exp = key[0];
00418                 offset = 1;
00419         }
00420 
00421         /* key length at least one */
00422         if(len < (size_t)offset + exp + 1)
00423                 return NULL;
00424 
00425         /* Exponent */
00426         exponent = BN_new();
00427         if(!exponent) return NULL;
00428         (void) BN_bin2bn(key+offset, (int)exp, exponent);
00429         offset += exp;
00430 
00431         /* Modulus */
00432         modulus = BN_new();
00433         if(!modulus) {
00434                 BN_free(exponent);
00435                 return NULL;
00436         }
00437         /* length of the buffer must match the key length! */
00438         (void) BN_bin2bn(key+offset, (int)(len - offset), modulus);
00439 
00440         rsa = RSA_new();
00441         if(!rsa) {
00442                 BN_free(exponent);
00443                 BN_free(modulus);
00444                 return NULL;
00445         }
00446 #ifndef S_SPLINT_S
00447         rsa->n = modulus;
00448         rsa->e = exponent;
00449 #endif /* splint */
00450 
00451         return rsa;
00452 }
00453 
00454 int
00455 ldns_digest_evp(unsigned char* data, unsigned int len, unsigned char* dest,
00456         const EVP_MD* md)
00457 {
00458         EVP_MD_CTX* ctx;
00459         ctx = EVP_MD_CTX_create();
00460         if(!ctx)
00461                 return false;
00462         if(!EVP_DigestInit_ex(ctx, md, NULL) ||
00463                 !EVP_DigestUpdate(ctx, data, len) ||
00464                 !EVP_DigestFinal_ex(ctx, dest, NULL)) {
00465                 EVP_MD_CTX_destroy(ctx);
00466                 return false;
00467         }
00468         EVP_MD_CTX_destroy(ctx);
00469         return true;
00470 }
00471 #endif /* HAVE_SSL */
00472 
00473 ldns_rr *
00474 ldns_key_rr2ds(const ldns_rr *key, ldns_hash h)
00475 {
00476         ldns_rdf *tmp;
00477         ldns_rr *ds;
00478         uint16_t keytag;
00479         uint8_t  sha1hash;
00480         uint8_t *digest;
00481         ldns_buffer *data_buf;
00482 #ifdef USE_GOST
00483         const EVP_MD* md = NULL;
00484 #endif
00485 
00486         if (ldns_rr_get_type(key) != LDNS_RR_TYPE_DNSKEY) {
00487                 return NULL;
00488         }
00489 
00490         ds = ldns_rr_new();
00491         if (!ds) {
00492                 return NULL;
00493         }
00494         ldns_rr_set_type(ds, LDNS_RR_TYPE_DS);
00495         ldns_rr_set_owner(ds, ldns_rdf_clone(
00496                                                                   ldns_rr_owner(key)));
00497         ldns_rr_set_ttl(ds, ldns_rr_ttl(key));
00498         ldns_rr_set_class(ds, ldns_rr_get_class(key));
00499 
00500         switch(h) {
00501         default:
00502         case LDNS_SHA1:
00503                 digest = LDNS_XMALLOC(uint8_t, LDNS_SHA1_DIGEST_LENGTH);
00504                 if (!digest) {
00505                         ldns_rr_free(ds);
00506                         return NULL;
00507                 }
00508                 break;
00509         case LDNS_SHA256:
00510                 digest = LDNS_XMALLOC(uint8_t, LDNS_SHA256_DIGEST_LENGTH);
00511                 if (!digest) {
00512                         ldns_rr_free(ds);
00513                         return NULL;
00514                 }
00515                 break;
00516         case LDNS_HASH_GOST:
00517 #ifdef USE_GOST
00518                 (void)ldns_key_EVP_load_gost_id();
00519                 md = EVP_get_digestbyname("md_gost94");
00520                 if(!md) {
00521                         ldns_rr_free(ds);
00522                         return NULL;
00523                 }
00524                 digest = LDNS_XMALLOC(uint8_t, EVP_MD_size(md));
00525                 if (!digest) {
00526                         ldns_rr_free(ds);
00527                         return NULL;
00528                 }
00529                 break;
00530 #else
00531                 /* not implemented */
00532                 ldns_rr_free(ds);
00533                 return NULL;
00534 #endif
00535         case LDNS_SHA384:
00536 #ifdef USE_ECDSA
00537                 digest = LDNS_XMALLOC(uint8_t, SHA384_DIGEST_LENGTH);
00538                 if (!digest) {
00539                         ldns_rr_free(ds);
00540                         return NULL;
00541                 }
00542                 break;
00543 #else
00544                 /* not implemented */
00545                 ldns_rr_free(ds);
00546                 return NULL;
00547 #endif
00548         }
00549 
00550         data_buf = ldns_buffer_new(LDNS_MAX_PACKETLEN);
00551         if (!data_buf) {
00552                 LDNS_FREE(digest);
00553                 ldns_rr_free(ds);
00554                 return NULL;
00555         }
00556 
00557         /* keytag */
00558         keytag = htons(ldns_calc_keytag((ldns_rr*)key));
00559         tmp = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_INT16,
00560                                                    sizeof(uint16_t),
00561                                                    &keytag);
00562         ldns_rr_push_rdf(ds, tmp);
00563 
00564         /* copy the algorithm field */
00565         if ((tmp = ldns_rr_rdf(key, 2)) == NULL) {
00566                 LDNS_FREE(digest);
00567                 ldns_buffer_free(data_buf);
00568                 ldns_rr_free(ds);
00569                 return NULL;
00570         } else {
00571                 ldns_rr_push_rdf(ds, ldns_rdf_clone( tmp )); 
00572         }
00573 
00574         /* digest hash type */
00575         sha1hash = (uint8_t)h;
00576         tmp = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_INT8,
00577                                                    sizeof(uint8_t),
00578                                                    &sha1hash);
00579         ldns_rr_push_rdf(ds, tmp);
00580 
00581         /* digest */
00582         /* owner name */
00583         tmp = ldns_rdf_clone(ldns_rr_owner(key));
00584         ldns_dname2canonical(tmp);
00585         if (ldns_rdf2buffer_wire(data_buf, tmp) != LDNS_STATUS_OK) {
00586                 LDNS_FREE(digest);
00587                 ldns_buffer_free(data_buf);
00588                 ldns_rr_free(ds);
00589                 ldns_rdf_deep_free(tmp);
00590                 return NULL;
00591         }
00592         ldns_rdf_deep_free(tmp);
00593 
00594         /* all the rdata's */
00595         if (ldns_rr_rdata2buffer_wire(data_buf,
00596                                                         (ldns_rr*)key) != LDNS_STATUS_OK) {
00597                 LDNS_FREE(digest);
00598                 ldns_buffer_free(data_buf);
00599                 ldns_rr_free(ds);
00600                 return NULL;
00601         }
00602         switch(h) {
00603         case LDNS_SHA1:
00604                 (void) ldns_sha1((unsigned char *) ldns_buffer_begin(data_buf),
00605                                  (unsigned int) ldns_buffer_position(data_buf),
00606                                  (unsigned char *) digest);
00607 
00608                 tmp = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_HEX,
00609                                             LDNS_SHA1_DIGEST_LENGTH,
00610                                             digest);
00611                 ldns_rr_push_rdf(ds, tmp);
00612 
00613                 break;
00614         case LDNS_SHA256:
00615                 (void) ldns_sha256((unsigned char *) ldns_buffer_begin(data_buf),
00616                                    (unsigned int) ldns_buffer_position(data_buf),
00617                                    (unsigned char *) digest);
00618                 tmp = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_HEX,
00619                                             LDNS_SHA256_DIGEST_LENGTH,
00620                                             digest);
00621                 ldns_rr_push_rdf(ds, tmp);
00622                 break;
00623         case LDNS_HASH_GOST:
00624 #ifdef USE_GOST
00625                 if(!ldns_digest_evp((unsigned char *) ldns_buffer_begin(data_buf),
00626                                 (unsigned int) ldns_buffer_position(data_buf),
00627                                 (unsigned char *) digest, md)) {
00628                         LDNS_FREE(digest);
00629                         ldns_buffer_free(data_buf);
00630                         ldns_rr_free(ds);
00631                         return NULL;
00632                 }
00633                 tmp = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_HEX,
00634                                             (size_t)EVP_MD_size(md),
00635                                             digest);
00636                 ldns_rr_push_rdf(ds, tmp);
00637 #endif
00638                 break;
00639         case LDNS_SHA384:
00640 #ifdef USE_ECDSA
00641                 (void) SHA384((unsigned char *) ldns_buffer_begin(data_buf),
00642                                  (unsigned int) ldns_buffer_position(data_buf),
00643                                  (unsigned char *) digest);
00644                 tmp = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_HEX,
00645                                             SHA384_DIGEST_LENGTH,
00646                                             digest);
00647                 ldns_rr_push_rdf(ds, tmp);
00648 #endif
00649                 break;
00650         }
00651 
00652         LDNS_FREE(digest);
00653         ldns_buffer_free(data_buf);
00654         return ds;
00655 }
00656 
00657 ldns_rdf *
00658 ldns_dnssec_create_nsec_bitmap(ldns_rr_type rr_type_list[],
00659                                size_t size,
00660                                ldns_rr_type nsec_type)
00661 {
00662         size_t i;
00663         uint8_t *bitmap;
00664         uint16_t bm_len = 0;
00665         uint16_t i_type;
00666         ldns_rdf *bitmap_rdf;
00667 
00668         uint8_t *data = NULL;
00669         uint8_t cur_data[32];
00670         uint8_t cur_window = 0;
00671         uint8_t cur_window_max = 0;
00672         uint16_t cur_data_size = 0;
00673 
00674         if (nsec_type != LDNS_RR_TYPE_NSEC &&
00675             nsec_type != LDNS_RR_TYPE_NSEC3) {
00676                 return NULL;
00677         }
00678 
00679         i_type = 0;
00680         for (i = 0; i < size; i++) {
00681                 if (i_type < rr_type_list[i])
00682                         i_type = rr_type_list[i];
00683         }
00684         if (i_type < nsec_type) {
00685                 i_type = nsec_type;
00686         }
00687 
00688         bm_len = i_type / 8 + 2;
00689         bitmap = LDNS_XMALLOC(uint8_t, bm_len);
00690         if(!bitmap) return NULL;
00691         for (i = 0; i < bm_len; i++) {
00692                 bitmap[i] = 0;
00693         }
00694 
00695         for (i = 0; i < size; i++) {
00696                 i_type = rr_type_list[i];
00697                 ldns_set_bit(bitmap + (int) i_type / 8,
00698                                    (int) (7 - (i_type % 8)),
00699                                    true);
00700         }
00701 
00702         /* fold it into windows TODO: can this be done directly? */
00703         memset(cur_data, 0, 32);
00704         for (i = 0; i < bm_len; i++) {
00705                 if (i / 32 > cur_window) {
00706                         /* check, copy, new */
00707                         if (cur_window_max > 0) {
00708                                 /* this window has stuff, add it */
00709                                 data = LDNS_XREALLOC(data,
00710                                                                  uint8_t,
00711                                                                  cur_data_size + cur_window_max + 3);
00712                                 if(!data) {
00713                                         LDNS_FREE(bitmap);
00714                                         return NULL;
00715                                 }
00716                                 data[cur_data_size] = cur_window;
00717                                 data[cur_data_size + 1] = cur_window_max + 1;
00718                                 memcpy(data + cur_data_size + 2,
00719                                           cur_data,
00720                                           cur_window_max+1);
00721                                 cur_data_size += cur_window_max + 3;
00722                         }
00723                         cur_window++;
00724                         cur_window_max = 0;
00725                         memset(cur_data, 0, 32);
00726                 }
00727                 cur_data[i%32] = bitmap[i];
00728                 if (bitmap[i] > 0) {
00729                         cur_window_max = i%32;
00730                 }
00731         }
00732         if (cur_window_max > 0 || cur_data[0] != 0) {
00733                 /* this window has stuff, add it */
00734                 data = LDNS_XREALLOC(data,
00735                                                  uint8_t,
00736                                                  cur_data_size + cur_window_max + 3);
00737                 if(!data) {
00738                         LDNS_FREE(bitmap);
00739                         return NULL;
00740                 }
00741                 data[cur_data_size] = cur_window;
00742                 data[cur_data_size + 1] = cur_window_max + 1;
00743                 memcpy(data + cur_data_size + 2, cur_data, cur_window_max+1);
00744                 cur_data_size += cur_window_max + 3;
00745         }
00746         bitmap_rdf = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_NSEC,
00747                                                                 cur_data_size,
00748                                                                 data);
00749 
00750         LDNS_FREE(bitmap);
00751         LDNS_FREE(data);
00752 
00753         return bitmap_rdf;
00754 }
00755 
00756 int
00757 ldns_dnssec_rrsets_contains_type(ldns_dnssec_rrsets *rrsets,
00758                                  ldns_rr_type type)
00759 {
00760         ldns_dnssec_rrsets *cur_rrset = rrsets;
00761         while (cur_rrset) {
00762                 if (cur_rrset->type == type) {
00763                         return 1;
00764                 }
00765                 cur_rrset = cur_rrset->next;
00766         }
00767         return 0;
00768 }
00769 
00770 ldns_rr *
00771 ldns_dnssec_create_nsec(ldns_dnssec_name *from,
00772                         ldns_dnssec_name *to,
00773                         ldns_rr_type nsec_type)
00774 {
00775         ldns_rr *nsec_rr;
00776         ldns_rr_type types[65536];
00777         size_t type_count = 0;
00778         ldns_dnssec_rrsets *cur_rrsets;
00779         int on_delegation_point;
00780 
00781         if (!from || !to || (nsec_type != LDNS_RR_TYPE_NSEC)) {
00782                 return NULL;
00783         }
00784 
00785         nsec_rr = ldns_rr_new();
00786         ldns_rr_set_type(nsec_rr, nsec_type);
00787         ldns_rr_set_owner(nsec_rr, ldns_rdf_clone(ldns_dnssec_name_name(from)));
00788         ldns_rr_push_rdf(nsec_rr, ldns_rdf_clone(ldns_dnssec_name_name(to)));
00789 
00790         on_delegation_point = ldns_dnssec_rrsets_contains_type(
00791                         from->rrsets, LDNS_RR_TYPE_NS)
00792                 && !ldns_dnssec_rrsets_contains_type(
00793                         from->rrsets, LDNS_RR_TYPE_SOA);
00794 
00795         cur_rrsets = from->rrsets;
00796         while (cur_rrsets) {
00797                 /* Do not include non-authoritative rrsets on the delegation point
00798                  * in the type bitmap */
00799                 if ((on_delegation_point && (
00800                                 cur_rrsets->type == LDNS_RR_TYPE_NS 
00801                              || cur_rrsets->type == LDNS_RR_TYPE_DS))
00802                         || (!on_delegation_point &&
00803                                 cur_rrsets->type != LDNS_RR_TYPE_RRSIG
00804                              && cur_rrsets->type != LDNS_RR_TYPE_NSEC)) {
00805 
00806                         types[type_count] = cur_rrsets->type;
00807                         type_count++;
00808                 }
00809                 cur_rrsets = cur_rrsets->next;
00810 
00811         }
00812         types[type_count] = LDNS_RR_TYPE_RRSIG;
00813         type_count++;
00814         types[type_count] = LDNS_RR_TYPE_NSEC;
00815         type_count++;
00816 
00817         ldns_rr_push_rdf(nsec_rr, ldns_dnssec_create_nsec_bitmap(types,
00818                                        type_count,
00819                                        nsec_type));
00820 
00821         return nsec_rr;
00822 }
00823 
00824 ldns_rr *
00825 ldns_dnssec_create_nsec3(ldns_dnssec_name *from,
00826                                         ldns_dnssec_name *to,
00827                                         ldns_rdf *zone_name,
00828                                         uint8_t algorithm,
00829                                         uint8_t flags,
00830                                         uint16_t iterations,
00831                                         uint8_t salt_length,
00832                                         uint8_t *salt)
00833 {
00834         ldns_rr *nsec_rr;
00835         ldns_rr_type types[65536];
00836         size_t type_count = 0;
00837         ldns_dnssec_rrsets *cur_rrsets;
00838         ldns_status status;
00839         int on_delegation_point;
00840 
00841         if (!from) {
00842                 return NULL;
00843         }
00844 
00845         nsec_rr = ldns_rr_new_frm_type(LDNS_RR_TYPE_NSEC3);
00846         ldns_rr_set_owner(nsec_rr,
00847                           ldns_nsec3_hash_name(ldns_dnssec_name_name(from),
00848                           algorithm,
00849                           iterations,
00850                           salt_length,
00851                           salt));
00852         status = ldns_dname_cat(ldns_rr_owner(nsec_rr), zone_name);
00853         if(status != LDNS_STATUS_OK) {
00854                 ldns_rr_free(nsec_rr);
00855                 return NULL;
00856         }
00857         ldns_nsec3_add_param_rdfs(nsec_rr,
00858                                   algorithm,
00859                                   flags,
00860                                   iterations,
00861                                   salt_length,
00862                                   salt);
00863 
00864         on_delegation_point = ldns_dnssec_rrsets_contains_type(
00865                         from->rrsets, LDNS_RR_TYPE_NS)
00866                 && !ldns_dnssec_rrsets_contains_type(
00867                         from->rrsets, LDNS_RR_TYPE_SOA);
00868         cur_rrsets = from->rrsets;
00869         while (cur_rrsets) {
00870                 /* Do not include non-authoritative rrsets on the delegation point
00871                  * in the type bitmap. Potentionally not skipping insecure
00872                  * delegation should have been done earlier, in function
00873                  * ldns_dnssec_zone_create_nsec3s, or even earlier in:
00874                  * ldns_dnssec_zone_sign_nsec3_flg .
00875                  */
00876                 if ((on_delegation_point && (
00877                                 cur_rrsets->type == LDNS_RR_TYPE_NS
00878                              || cur_rrsets->type == LDNS_RR_TYPE_DS))
00879                         || (!on_delegation_point &&
00880                                 cur_rrsets->type != LDNS_RR_TYPE_RRSIG)) {
00881 
00882                         types[type_count] = cur_rrsets->type;
00883                         type_count++;
00884                 }
00885                 cur_rrsets = cur_rrsets->next;
00886         }
00887         /* always add rrsig type if this is not an unsigned
00888          * delegation
00889          */
00890         if (type_count > 0 &&
00891             !(type_count == 1 && types[0] == LDNS_RR_TYPE_NS)) {
00892                 types[type_count] = LDNS_RR_TYPE_RRSIG;
00893                 type_count++;
00894         }
00895 
00896         /* leave next rdata empty if they weren't precomputed yet */
00897         if (to && to->hashed_name) {
00898                 (void) ldns_rr_set_rdf(nsec_rr,
00899                                        ldns_rdf_clone(to->hashed_name),
00900                                        4);
00901         } else {
00902                 (void) ldns_rr_set_rdf(nsec_rr, NULL, 4);
00903         }
00904 
00905         ldns_rr_push_rdf(nsec_rr,
00906                          ldns_dnssec_create_nsec_bitmap(types,
00907                          type_count,
00908                          LDNS_RR_TYPE_NSEC3));
00909 
00910         return nsec_rr;
00911 }
00912 
00913 ldns_rr *
00914 ldns_create_nsec(ldns_rdf *cur_owner, ldns_rdf *next_owner, ldns_rr_list *rrs)
00915 {
00916         /* we do not do any check here - garbage in, garbage out */
00917 
00918         /* the the start and end names - get the type from the
00919          * before rrlist */
00920 
00921         /* inefficient, just give it a name, a next name, and a list of rrs */
00922         /* we make 1 big uberbitmap first, then windows */
00923         /* todo: make something more efficient :) */
00924         uint16_t i;
00925         ldns_rr *i_rr;
00926         uint16_t i_type;
00927 
00928         ldns_rr *nsec = NULL;
00929         ldns_rr_type i_type_list[65536];
00930         size_t type_count = 0;
00931 
00932         nsec = ldns_rr_new();
00933         ldns_rr_set_type(nsec, LDNS_RR_TYPE_NSEC);
00934         ldns_rr_set_owner(nsec, ldns_rdf_clone(cur_owner));
00935         ldns_rr_push_rdf(nsec, ldns_rdf_clone(next_owner));
00936 
00937         for (i = 0; i < ldns_rr_list_rr_count(rrs); i++) {
00938                 i_rr = ldns_rr_list_rr(rrs, i);
00939                 if (ldns_rdf_compare(cur_owner,
00940                                                  ldns_rr_owner(i_rr)) == 0) {
00941                         i_type = ldns_rr_get_type(i_rr);
00942                         if (i_type != LDNS_RR_TYPE_RRSIG && i_type != LDNS_RR_TYPE_NSEC) {
00943                                 if (type_count == 0 || i_type_list[type_count-1] != i_type) {
00944                                         i_type_list[type_count] = i_type;
00945                                         type_count++;
00946                                 }
00947                         }
00948                 }
00949         }
00950 
00951         i_type_list[type_count] = LDNS_RR_TYPE_RRSIG;
00952         type_count++;
00953         i_type_list[type_count] = LDNS_RR_TYPE_NSEC;
00954         type_count++;
00955 
00956         ldns_rr_push_rdf(nsec,
00957                                   ldns_dnssec_create_nsec_bitmap(i_type_list,
00958                                                 type_count, LDNS_RR_TYPE_NSEC));
00959 
00960         return nsec;
00961 }
00962 
00963 ldns_rdf *
00964 ldns_nsec3_hash_name(ldns_rdf *name,
00965                                  uint8_t algorithm,
00966                                  uint16_t iterations,
00967                                  uint8_t salt_length,
00968                                  uint8_t *salt)
00969 {
00970         size_t hashed_owner_str_len;
00971         ldns_rdf *cann;
00972         ldns_rdf *hashed_owner;
00973         unsigned char *hashed_owner_str;
00974         char *hashed_owner_b32;
00975         size_t hashed_owner_b32_len;
00976         uint32_t cur_it;
00977         /* define to contain the largest possible hash, which is
00978          * sha1 at the moment */
00979         unsigned char hash[LDNS_SHA1_DIGEST_LENGTH];
00980         ldns_status status;
00981 
00982         /* TODO: mnemonic list for hash algs SHA-1, default to 1 now (sha1) */
00983         if (algorithm != LDNS_SHA1) {
00984                 return NULL;
00985         }
00986 
00987         /* prepare the owner name according to the draft section bla */
00988         cann = ldns_rdf_clone(name);
00989         if(!cann) {
00990                 fprintf(stderr, "Memory error\n");
00991                 return NULL;
00992         }
00993         ldns_dname2canonical(cann);
00994 
00995         hashed_owner_str_len = salt_length + ldns_rdf_size(cann);
00996         hashed_owner_str = LDNS_XMALLOC(unsigned char, hashed_owner_str_len);
00997         if(!hashed_owner_str) {
00998                 ldns_rdf_deep_free(cann);
00999                 return NULL;
01000         }
01001         memcpy(hashed_owner_str, ldns_rdf_data(cann), ldns_rdf_size(cann));
01002         memcpy(hashed_owner_str + ldns_rdf_size(cann), salt, salt_length);
01003         ldns_rdf_deep_free(cann);
01004 
01005         for (cur_it = iterations + 1; cur_it > 0; cur_it--) {
01006                 (void) ldns_sha1((unsigned char *) hashed_owner_str,
01007                                  (unsigned int) hashed_owner_str_len, hash);
01008 
01009                 LDNS_FREE(hashed_owner_str);
01010                 hashed_owner_str_len = salt_length + LDNS_SHA1_DIGEST_LENGTH;
01011                 hashed_owner_str = LDNS_XMALLOC(unsigned char, hashed_owner_str_len);
01012                 if (!hashed_owner_str) {
01013                         return NULL;
01014                 }
01015                 memcpy(hashed_owner_str, hash, LDNS_SHA1_DIGEST_LENGTH);
01016                 memcpy(hashed_owner_str + LDNS_SHA1_DIGEST_LENGTH, salt, salt_length);
01017                 hashed_owner_str_len = LDNS_SHA1_DIGEST_LENGTH + salt_length;
01018         }
01019 
01020         LDNS_FREE(hashed_owner_str);
01021         hashed_owner_str = hash;
01022         hashed_owner_str_len = LDNS_SHA1_DIGEST_LENGTH;
01023 
01024         hashed_owner_b32 = LDNS_XMALLOC(char,
01025                   ldns_b32_ntop_calculate_size(hashed_owner_str_len) + 1);
01026         if(!hashed_owner_b32) {
01027                 return NULL;
01028         }
01029         hashed_owner_b32_len = (size_t) ldns_b32_ntop_extended_hex(
01030                 (uint8_t *) hashed_owner_str,
01031                 hashed_owner_str_len,
01032                 hashed_owner_b32,
01033                 ldns_b32_ntop_calculate_size(hashed_owner_str_len)+1);
01034         if (hashed_owner_b32_len < 1) {
01035                 fprintf(stderr, "Error in base32 extended hex encoding ");
01036                 fprintf(stderr, "of hashed owner name (name: ");
01037                 ldns_rdf_print(stderr, name);
01038                 fprintf(stderr, ", return code: %u)\n",
01039                         (unsigned int) hashed_owner_b32_len);
01040                 LDNS_FREE(hashed_owner_b32);
01041                 return NULL;
01042         }
01043         hashed_owner_b32[hashed_owner_b32_len] = '\0';
01044 
01045         status = ldns_str2rdf_dname(&hashed_owner, hashed_owner_b32);
01046         if (status != LDNS_STATUS_OK) {
01047                 fprintf(stderr, "Error creating rdf from %s\n", hashed_owner_b32);
01048                 LDNS_FREE(hashed_owner_b32);
01049                 return NULL;
01050         }
01051 
01052         LDNS_FREE(hashed_owner_b32);
01053         return hashed_owner;
01054 }
01055 
01056 void
01057 ldns_nsec3_add_param_rdfs(ldns_rr *rr,
01058                                          uint8_t algorithm,
01059                                          uint8_t flags,
01060                                          uint16_t iterations,
01061                                          uint8_t salt_length,
01062                                          uint8_t *salt)
01063 {
01064         ldns_rdf *salt_rdf = NULL;
01065         uint8_t *salt_data = NULL;
01066         ldns_rdf *old;
01067 
01068         old = ldns_rr_set_rdf(rr,
01069                               ldns_rdf_new_frm_data(LDNS_RDF_TYPE_INT8,
01070                                                     1, (void*)&algorithm),
01071                               0);
01072         if (old) ldns_rdf_deep_free(old);
01073 
01074         old = ldns_rr_set_rdf(rr,
01075                               ldns_rdf_new_frm_data(LDNS_RDF_TYPE_INT8,
01076                                                     1, (void*)&flags),
01077                               1);
01078         if (old) ldns_rdf_deep_free(old);
01079 
01080         old = ldns_rr_set_rdf(rr,
01081                           ldns_native2rdf_int16(LDNS_RDF_TYPE_INT16,
01082                                                 iterations),
01083                               2);
01084         if (old) ldns_rdf_deep_free(old);
01085 
01086         salt_data = LDNS_XMALLOC(uint8_t, salt_length + 1);
01087         if(!salt_data) {
01088                 /* no way to return error */
01089                 return;
01090         }
01091         salt_data[0] = salt_length;
01092         memcpy(salt_data + 1, salt, salt_length);
01093         salt_rdf = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_NSEC3_SALT,
01094                                                            salt_length + 1,
01095                                                            salt_data);
01096         if(!salt_rdf) {
01097                 LDNS_FREE(salt_data);
01098                 /* no way to return error */
01099                 return;
01100         }
01101 
01102         old = ldns_rr_set_rdf(rr, salt_rdf, 3);
01103         if (old) ldns_rdf_deep_free(old);
01104         LDNS_FREE(salt_data);
01105 }
01106 
01107 static int
01108 rr_list_delegation_only(ldns_rdf *origin, ldns_rr_list *rr_list)
01109 {
01110         size_t i;
01111         ldns_rr *cur_rr;
01112         if (!origin || !rr_list) return 0;
01113         for (i = 0; i < ldns_rr_list_rr_count(rr_list); i++) {
01114                 cur_rr = ldns_rr_list_rr(rr_list, i);
01115                 if (ldns_dname_compare(ldns_rr_owner(cur_rr), origin) == 0) {
01116                         return 0;
01117                 }
01118                 if (ldns_rr_get_type(cur_rr) != LDNS_RR_TYPE_NS) {
01119                         return 0;
01120                 }
01121         }
01122         return 1;
01123 }
01124 
01125 /* this will NOT return the NSEC3  completed, you will have to run the
01126    finalize function on the rrlist later! */
01127 ldns_rr *
01128 ldns_create_nsec3(ldns_rdf *cur_owner,
01129                   ldns_rdf *cur_zone,
01130                   ldns_rr_list *rrs,
01131                   uint8_t algorithm,
01132                   uint8_t flags,
01133                   uint16_t iterations,
01134                   uint8_t salt_length,
01135                   uint8_t *salt,
01136                   bool emptynonterminal)
01137 {
01138         size_t i;
01139         ldns_rr *i_rr;
01140         uint16_t i_type;
01141 
01142         ldns_rr *nsec = NULL;
01143         ldns_rdf *hashed_owner = NULL;
01144 
01145         ldns_status status;
01146 
01147     ldns_rr_type i_type_list[1024];
01148         size_t type_count = 0;
01149 
01150         hashed_owner = ldns_nsec3_hash_name(cur_owner,
01151                                                                  algorithm,
01152                                                                  iterations,
01153                                                                  salt_length,
01154                                                                  salt);
01155         status = ldns_dname_cat(hashed_owner, cur_zone);
01156         if(status != LDNS_STATUS_OK) {
01157                 ldns_rdf_deep_free(hashed_owner);
01158                 return NULL;
01159         }
01160         nsec = ldns_rr_new_frm_type(LDNS_RR_TYPE_NSEC3);
01161         if(!nsec) {
01162                 ldns_rdf_deep_free(hashed_owner);
01163                 return NULL;
01164         }
01165         ldns_rr_set_type(nsec, LDNS_RR_TYPE_NSEC3);
01166         ldns_rr_set_owner(nsec, hashed_owner);
01167 
01168         ldns_nsec3_add_param_rdfs(nsec,
01169                                                  algorithm,
01170                                                  flags,
01171                                                  iterations,
01172                                                  salt_length,
01173                                                  salt);
01174         (void) ldns_rr_set_rdf(nsec, NULL, 4);
01175 
01176 
01177         for (i = 0; i < ldns_rr_list_rr_count(rrs); i++) {
01178                 i_rr = ldns_rr_list_rr(rrs, i);
01179                 if (ldns_rdf_compare(cur_owner,
01180                                                  ldns_rr_owner(i_rr)) == 0) {
01181                         i_type = ldns_rr_get_type(i_rr);
01182                         if (type_count == 0 || i_type_list[type_count-1] != i_type) {
01183                                 i_type_list[type_count] = i_type;
01184                                 type_count++;
01185                         }
01186                 }
01187         }
01188 
01189         /* add RRSIG anyway, but only if this is not an ENT or
01190          * an unsigned delegation */
01191         if (!emptynonterminal && !rr_list_delegation_only(cur_zone, rrs)) {
01192                 i_type_list[type_count] = LDNS_RR_TYPE_RRSIG;
01193                 type_count++;
01194         }
01195 
01196         /* and SOA if owner == zone */
01197         if (ldns_dname_compare(cur_zone, cur_owner) == 0) {
01198                 i_type_list[type_count] = LDNS_RR_TYPE_SOA;
01199                 type_count++;
01200         }
01201 
01202         ldns_rr_push_rdf(nsec,
01203                                   ldns_dnssec_create_nsec_bitmap(i_type_list,
01204                                                 type_count, LDNS_RR_TYPE_NSEC3));
01205 
01206         return nsec;
01207 }
01208 
01209 uint8_t
01210 ldns_nsec3_algorithm(const ldns_rr *nsec3_rr)
01211 {
01212         if (nsec3_rr && 
01213               (ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3 ||
01214                ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3PARAM)
01215             && (ldns_rr_rdf(nsec3_rr, 0) != NULL)
01216             && ldns_rdf_size(ldns_rr_rdf(nsec3_rr, 0)) > 0) {
01217                 return ldns_rdf2native_int8(ldns_rr_rdf(nsec3_rr, 0));
01218         }
01219         return 0;
01220 }
01221 
01222 uint8_t
01223 ldns_nsec3_flags(const ldns_rr *nsec3_rr)
01224 {
01225         if (nsec3_rr && 
01226               (ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3 ||
01227                ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3PARAM)
01228             && (ldns_rr_rdf(nsec3_rr, 1) != NULL)
01229             && ldns_rdf_size(ldns_rr_rdf(nsec3_rr, 1)) > 0) {
01230                 return ldns_rdf2native_int8(ldns_rr_rdf(nsec3_rr, 1));
01231         }
01232         return 0;
01233 }
01234 
01235 bool
01236 ldns_nsec3_optout(const ldns_rr *nsec3_rr)
01237 {
01238         return (ldns_nsec3_flags(nsec3_rr) & LDNS_NSEC3_VARS_OPTOUT_MASK);
01239 }
01240 
01241 uint16_t
01242 ldns_nsec3_iterations(const ldns_rr *nsec3_rr)
01243 {
01244         if (nsec3_rr &&
01245               (ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3 ||
01246                ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3PARAM)
01247             && (ldns_rr_rdf(nsec3_rr, 2) != NULL)
01248             && ldns_rdf_size(ldns_rr_rdf(nsec3_rr, 2)) > 0) {
01249                 return ldns_rdf2native_int16(ldns_rr_rdf(nsec3_rr, 2));
01250         }
01251         return 0;
01252         
01253 }
01254 
01255 ldns_rdf *
01256 ldns_nsec3_salt(const ldns_rr *nsec3_rr)
01257 {
01258         if (nsec3_rr && 
01259               (ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3 ||
01260                ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3PARAM)
01261             ) {
01262                 return ldns_rr_rdf(nsec3_rr, 3);
01263         }
01264         return NULL;
01265 }
01266 
01267 uint8_t
01268 ldns_nsec3_salt_length(const ldns_rr *nsec3_rr)
01269 {
01270         ldns_rdf *salt_rdf = ldns_nsec3_salt(nsec3_rr);
01271         if (salt_rdf && ldns_rdf_size(salt_rdf) > 0) {
01272                 return (uint8_t) ldns_rdf_data(salt_rdf)[0];
01273         }
01274         return 0;
01275 }
01276 
01277 /* allocs data, free with LDNS_FREE() */
01278 uint8_t *
01279 ldns_nsec3_salt_data(const ldns_rr *nsec3_rr)
01280 {
01281         uint8_t salt_length;
01282         uint8_t *salt;
01283 
01284         ldns_rdf *salt_rdf = ldns_nsec3_salt(nsec3_rr);
01285         if (salt_rdf && ldns_rdf_size(salt_rdf) > 0) {
01286                 salt_length = ldns_rdf_data(salt_rdf)[0];
01287                 salt = LDNS_XMALLOC(uint8_t, salt_length);
01288                 if(!salt) return NULL;
01289                 memcpy(salt, &ldns_rdf_data(salt_rdf)[1], salt_length);
01290                 return salt;
01291         }
01292         return NULL;
01293 }
01294 
01295 ldns_rdf *
01296 ldns_nsec3_next_owner(const ldns_rr *nsec3_rr)
01297 {
01298         if (!nsec3_rr || ldns_rr_get_type(nsec3_rr) != LDNS_RR_TYPE_NSEC3) {
01299                 return NULL;
01300         } else {
01301                 return ldns_rr_rdf(nsec3_rr, 4);
01302         }
01303 }
01304 
01305 ldns_rdf *
01306 ldns_nsec3_bitmap(const ldns_rr *nsec3_rr)
01307 {
01308         if (!nsec3_rr || ldns_rr_get_type(nsec3_rr) != LDNS_RR_TYPE_NSEC3) {
01309                 return NULL;
01310         } else {
01311                 return ldns_rr_rdf(nsec3_rr, 5);
01312         }
01313 }
01314 
01315 ldns_rdf *
01316 ldns_nsec3_hash_name_frm_nsec3(const ldns_rr *nsec, ldns_rdf *name)
01317 {
01318         uint8_t algorithm;
01319         uint16_t iterations;
01320         uint8_t salt_length;
01321         uint8_t *salt = 0;
01322 
01323         ldns_rdf *hashed_owner;
01324 
01325         algorithm = ldns_nsec3_algorithm(nsec);
01326         salt_length = ldns_nsec3_salt_length(nsec);
01327         salt = ldns_nsec3_salt_data(nsec);
01328         iterations = ldns_nsec3_iterations(nsec);
01329 
01330         hashed_owner = ldns_nsec3_hash_name(name,
01331                                                                  algorithm,
01332                                                                  iterations,
01333                                                                  salt_length,
01334                                                                  salt);
01335 
01336         LDNS_FREE(salt);
01337         return hashed_owner;
01338 }
01339 
01340 bool
01341 ldns_nsec_bitmap_covers_type(const ldns_rdf *nsec_bitmap, ldns_rr_type type)
01342 {
01343         uint8_t window_block_nr;
01344         uint8_t bitmap_length;
01345         uint16_t cur_type;
01346         uint16_t pos = 0;
01347         uint16_t bit_pos;
01348         uint8_t *data;
01349 
01350         if (nsec_bitmap == NULL) {
01351                 return false;
01352         }
01353         data = ldns_rdf_data(nsec_bitmap);
01354         while(pos < ldns_rdf_size(nsec_bitmap)) {
01355                 window_block_nr = data[pos];
01356                 bitmap_length = data[pos + 1];
01357                 pos += 2;
01358 
01359                 for (bit_pos = 0; bit_pos < (bitmap_length) * 8; bit_pos++) {
01360                         if (ldns_get_bit(&data[pos], bit_pos)) {
01361                                 cur_type = 256 * (uint16_t) window_block_nr + bit_pos;
01362                                 if (cur_type == type) {
01363                                         return true;
01364                                 }
01365                         }
01366                 }
01367 
01368                 pos += (uint16_t) bitmap_length;
01369         }
01370         return false;
01371 }
01372 
01373 bool
01374 ldns_nsec_covers_name(const ldns_rr *nsec, const ldns_rdf *name)
01375 {
01376         ldns_rdf *nsec_owner = ldns_rr_owner(nsec);
01377         ldns_rdf *hash_next;
01378         char *next_hash_str;
01379         ldns_rdf *nsec_next = NULL;
01380         ldns_status status;
01381         ldns_rdf *chopped_dname;
01382         bool result;
01383 
01384         if (ldns_rr_get_type(nsec) == LDNS_RR_TYPE_NSEC) {
01385                 if (ldns_rr_rdf(nsec, 0) != NULL) {
01386                         nsec_next = ldns_rdf_clone(ldns_rr_rdf(nsec, 0));
01387                 } else {
01388                         return false;
01389                 }
01390         } else if (ldns_rr_get_type(nsec) == LDNS_RR_TYPE_NSEC3) {
01391                 hash_next = ldns_nsec3_next_owner(nsec);
01392                 next_hash_str = ldns_rdf2str(hash_next);
01393                 nsec_next = ldns_dname_new_frm_str(next_hash_str);
01394                 LDNS_FREE(next_hash_str);
01395                 chopped_dname = ldns_dname_left_chop(nsec_owner);
01396                 status = ldns_dname_cat(nsec_next, chopped_dname);
01397                 ldns_rdf_deep_free(chopped_dname);
01398                 if (status != LDNS_STATUS_OK) {
01399                         printf("error catting: %s\n", ldns_get_errorstr_by_id(status));
01400                 }
01401         } else {
01402                 ldns_rdf_deep_free(nsec_next);
01403                 return false;
01404         }
01405 
01406         /* in the case of the last nsec */
01407         if(ldns_dname_compare(nsec_owner, nsec_next) > 0) {
01408                 result = (ldns_dname_compare(nsec_owner, name) <= 0 ||
01409                                 ldns_dname_compare(name, nsec_next) < 0);
01410         } else {
01411                 result = (ldns_dname_compare(nsec_owner, name) <= 0 &&
01412                           ldns_dname_compare(name, nsec_next) < 0);
01413         }
01414 
01415         ldns_rdf_deep_free(nsec_next);
01416         return result;
01417 }
01418 
01419 #ifdef HAVE_SSL
01420 /* sig may be null - if so look in the packet */
01421 
01422 ldns_status
01423 ldns_pkt_verify_time(ldns_pkt *p, ldns_rr_type t, ldns_rdf *o, 
01424                 ldns_rr_list *k, ldns_rr_list *s, 
01425                 time_t check_time, ldns_rr_list *good_keys)
01426 {
01427         ldns_rr_list *rrset;
01428         ldns_rr_list *sigs;
01429         ldns_rr_list *sigs_covered;
01430         ldns_rdf *rdf_t;
01431         ldns_rr_type t_netorder;
01432 
01433         if (!k) {
01434                 return LDNS_STATUS_ERR;
01435                 /* return LDNS_STATUS_CRYPTO_NO_DNSKEY; */
01436         }
01437 
01438         if (t == LDNS_RR_TYPE_RRSIG) {
01439                 /* we don't have RRSIG(RRSIG) (yet? ;-) ) */
01440                 return LDNS_STATUS_ERR;
01441         }
01442 
01443         if (s) {
01444                 /* if s is not NULL, the sigs are given to use */
01445                 sigs = s;
01446         } else {
01447                 /* otherwise get them from the packet */
01448                 sigs = ldns_pkt_rr_list_by_name_and_type(p, o,
01449                                 LDNS_RR_TYPE_RRSIG,
01450                                 LDNS_SECTION_ANY_NOQUESTION);
01451                 if (!sigs) {
01452                         /* no sigs */
01453                         return LDNS_STATUS_ERR;
01454                         /* return LDNS_STATUS_CRYPTO_NO_RRSIG; */
01455                 }
01456         }
01457 
01458         /* rrsig are subtyped, so now we need to find the correct
01459          * sigs for the type t
01460          */
01461         t_netorder = htons(t); /* rdf are in network order! */
01462         /* a type identifier is a 16-bit number, so the size is 2 bytes */
01463         rdf_t = ldns_rdf_new(LDNS_RDF_TYPE_TYPE, 2, &t_netorder);
01464 
01465         sigs_covered = ldns_rr_list_subtype_by_rdf(sigs, rdf_t, 0);
01466         ldns_rdf_free(rdf_t);
01467         if (! sigs_covered) {
01468                 if (! s) {
01469                         ldns_rr_list_deep_free(sigs);
01470                 }
01471                 return LDNS_STATUS_ERR;
01472         }
01473         ldns_rr_list_deep_free(sigs_covered);
01474 
01475         rrset = ldns_pkt_rr_list_by_name_and_type(p, o, t,
01476                         LDNS_SECTION_ANY_NOQUESTION);
01477         if (!rrset) {
01478                 if (! s) {
01479                         ldns_rr_list_deep_free(sigs);
01480                 }
01481                 return LDNS_STATUS_ERR;
01482         }
01483         return ldns_verify_time(rrset, sigs, k, check_time, good_keys);
01484 }
01485 
01486 ldns_status
01487 ldns_pkt_verify(ldns_pkt *p, ldns_rr_type t, ldns_rdf *o, 
01488                 ldns_rr_list *k, ldns_rr_list *s, ldns_rr_list *good_keys)
01489 {
01490         return ldns_pkt_verify_time(p, t, o, k, s, ldns_time(NULL), good_keys);
01491 }
01492 #endif /* HAVE_SSL */
01493 
01494 ldns_status
01495 ldns_dnssec_chain_nsec3_list(ldns_rr_list *nsec3_rrs)
01496 {
01497         size_t i;
01498         char *next_nsec_owner_str;
01499         ldns_rdf *next_nsec_owner_label;
01500         ldns_rdf *next_nsec_rdf;
01501         ldns_status status = LDNS_STATUS_OK;
01502 
01503         for (i = 0; i < ldns_rr_list_rr_count(nsec3_rrs); i++) {
01504                 if (i == ldns_rr_list_rr_count(nsec3_rrs) - 1) {
01505                         next_nsec_owner_label =
01506                                 ldns_dname_label(ldns_rr_owner(ldns_rr_list_rr(nsec3_rrs,
01507                                                                                                           0)), 0);
01508                         next_nsec_owner_str = ldns_rdf2str(next_nsec_owner_label);
01509                         if (next_nsec_owner_str[strlen(next_nsec_owner_str) - 1]
01510                             == '.') {
01511                                 next_nsec_owner_str[strlen(next_nsec_owner_str) - 1]
01512                                         = '\0';
01513                         }
01514                         status = ldns_str2rdf_b32_ext(&next_nsec_rdf,
01515                                                                         next_nsec_owner_str);
01516                         if (!ldns_rr_set_rdf(ldns_rr_list_rr(nsec3_rrs, i),
01517                                                          next_nsec_rdf, 4)) {
01518                                 /* todo: error */
01519                         }
01520 
01521                         ldns_rdf_deep_free(next_nsec_owner_label);
01522                         LDNS_FREE(next_nsec_owner_str);
01523                 } else {
01524                         next_nsec_owner_label =
01525                                 ldns_dname_label(ldns_rr_owner(ldns_rr_list_rr(nsec3_rrs,
01526                                                                                                           i + 1)),
01527                                                           0);
01528                         next_nsec_owner_str = ldns_rdf2str(next_nsec_owner_label);
01529                         if (next_nsec_owner_str[strlen(next_nsec_owner_str) - 1]
01530                             == '.') {
01531                                 next_nsec_owner_str[strlen(next_nsec_owner_str) - 1]
01532                                         = '\0';
01533                         }
01534                         status = ldns_str2rdf_b32_ext(&next_nsec_rdf,
01535                                                                         next_nsec_owner_str);
01536                         ldns_rdf_deep_free(next_nsec_owner_label);
01537                         LDNS_FREE(next_nsec_owner_str);
01538                         if (!ldns_rr_set_rdf(ldns_rr_list_rr(nsec3_rrs, i),
01539                                                          next_nsec_rdf, 4)) {
01540                                 /* todo: error */
01541                         }
01542                 }
01543         }
01544         return status;
01545 }
01546 
01547 int
01548 qsort_rr_compare_nsec3(const void *a, const void *b)
01549 {
01550         const ldns_rr *rr1 = * (const ldns_rr **) a;
01551         const ldns_rr *rr2 = * (const ldns_rr **) b;
01552         if (rr1 == NULL && rr2 == NULL) {
01553                 return 0;
01554         }
01555         if (rr1 == NULL) {
01556                 return -1;
01557         }
01558         if (rr2 == NULL) {
01559                 return 1;
01560         }
01561         return ldns_rdf_compare(ldns_rr_owner(rr1), ldns_rr_owner(rr2));
01562 }
01563 
01564 void
01565 ldns_rr_list_sort_nsec3(ldns_rr_list *unsorted)
01566 {
01567         qsort(unsorted->_rrs,
01568               ldns_rr_list_rr_count(unsorted),
01569               sizeof(ldns_rr *),
01570               qsort_rr_compare_nsec3);
01571 }
01572 
01573 int
01574 ldns_dnssec_default_add_to_signatures( ATTR_UNUSED(ldns_rr *sig)
01575                                      , ATTR_UNUSED(void *n)
01576                                      )
01577 {
01578         return LDNS_SIGNATURE_LEAVE_ADD_NEW;
01579 }
01580 
01581 int
01582 ldns_dnssec_default_leave_signatures( ATTR_UNUSED(ldns_rr *sig)
01583                                     , ATTR_UNUSED(void *n)
01584                                     )
01585 {
01586         return LDNS_SIGNATURE_LEAVE_NO_ADD;
01587 }
01588 
01589 int
01590 ldns_dnssec_default_delete_signatures( ATTR_UNUSED(ldns_rr *sig)
01591                                      , ATTR_UNUSED(void *n)
01592                                      )
01593 {
01594         return LDNS_SIGNATURE_REMOVE_NO_ADD;
01595 }
01596 
01597 int
01598 ldns_dnssec_default_replace_signatures( ATTR_UNUSED(ldns_rr *sig)
01599                                       , ATTR_UNUSED(void *n)
01600                                       )
01601 {
01602         return LDNS_SIGNATURE_REMOVE_ADD_NEW;
01603 }
01604 
01605 #ifdef HAVE_SSL
01606 ldns_rdf *
01607 ldns_convert_dsa_rrsig_asn12rdf(const ldns_buffer *sig,
01608                                                   const long sig_len)
01609 {
01610         ldns_rdf *sigdata_rdf;
01611         DSA_SIG *dsasig;
01612         unsigned char *dsasig_data = (unsigned char*)ldns_buffer_begin(sig);
01613         size_t byte_offset;
01614 
01615         dsasig = d2i_DSA_SIG(NULL,
01616                                          (const unsigned char **)&dsasig_data,
01617                                          sig_len);
01618         if (!dsasig) {
01619                 DSA_SIG_free(dsasig);
01620                 return NULL;
01621         }
01622 
01623         dsasig_data = LDNS_XMALLOC(unsigned char, 41);
01624         if(!dsasig_data) {
01625                 DSA_SIG_free(dsasig);
01626                 return NULL;
01627         }
01628         dsasig_data[0] = 0;
01629         byte_offset = (size_t) (20 - BN_num_bytes(dsasig->r));
01630         if (byte_offset > 20) {
01631                 DSA_SIG_free(dsasig);
01632                 LDNS_FREE(dsasig_data);
01633                 return NULL;
01634         }
01635         memset(&dsasig_data[1], 0, byte_offset);
01636         BN_bn2bin(dsasig->r, &dsasig_data[1 + byte_offset]);
01637         byte_offset = (size_t) (20 - BN_num_bytes(dsasig->s));
01638         if (byte_offset > 20) {
01639                 DSA_SIG_free(dsasig);
01640                 LDNS_FREE(dsasig_data);
01641                 return NULL;
01642         }
01643         memset(&dsasig_data[21], 0, byte_offset);
01644         BN_bn2bin(dsasig->s, &dsasig_data[21 + byte_offset]);
01645 
01646         sigdata_rdf = ldns_rdf_new(LDNS_RDF_TYPE_B64, 41, dsasig_data);
01647         if(!sigdata_rdf) {
01648                 LDNS_FREE(dsasig_data);
01649         }
01650         DSA_SIG_free(dsasig);
01651 
01652         return sigdata_rdf;
01653 }
01654 
01655 ldns_status
01656 ldns_convert_dsa_rrsig_rdf2asn1(ldns_buffer *target_buffer,
01657                                                   const ldns_rdf *sig_rdf)
01658 {
01659         /* the EVP api wants the DER encoding of the signature... */
01660         BIGNUM *R, *S;
01661         DSA_SIG *dsasig;
01662         unsigned char *raw_sig = NULL;
01663         int raw_sig_len;
01664 
01665         if(ldns_rdf_size(sig_rdf) < 1 + 2*SHA_DIGEST_LENGTH)
01666                 return LDNS_STATUS_SYNTAX_RDATA_ERR;
01667         /* extract the R and S field from the sig buffer */
01668         R = BN_new();
01669         if(!R) return LDNS_STATUS_MEM_ERR;
01670         (void) BN_bin2bn((unsigned char *) ldns_rdf_data(sig_rdf) + 1,
01671                          SHA_DIGEST_LENGTH, R);
01672         S = BN_new();
01673         if(!S) {
01674                 BN_free(R);
01675                 return LDNS_STATUS_MEM_ERR;
01676         }
01677         (void) BN_bin2bn((unsigned char *) ldns_rdf_data(sig_rdf) + 21,
01678                          SHA_DIGEST_LENGTH, S);
01679 
01680         dsasig = DSA_SIG_new();
01681         if (!dsasig) {
01682                 BN_free(R);
01683                 BN_free(S);
01684                 return LDNS_STATUS_MEM_ERR;
01685         }
01686 
01687         dsasig->r = R;
01688         dsasig->s = S;
01689 
01690         raw_sig_len = i2d_DSA_SIG(dsasig, &raw_sig);
01691         if (raw_sig_len < 0) {
01692                 DSA_SIG_free(dsasig);
01693                 free(raw_sig);
01694                 return LDNS_STATUS_SSL_ERR;
01695         }
01696         if (ldns_buffer_reserve(target_buffer, (size_t) raw_sig_len)) {
01697                 ldns_buffer_write(target_buffer, raw_sig, (size_t)raw_sig_len);
01698         }
01699 
01700         DSA_SIG_free(dsasig);
01701         free(raw_sig);
01702 
01703         return ldns_buffer_status(target_buffer);
01704 }
01705 
01706 #ifdef USE_ECDSA
01707 #ifndef S_SPLINT_S
01708 ldns_rdf *
01709 ldns_convert_ecdsa_rrsig_asn12rdf(const ldns_buffer *sig, const long sig_len)
01710 {
01711         ECDSA_SIG* ecdsa_sig;
01712         unsigned char *data = (unsigned char*)ldns_buffer_begin(sig);
01713         ldns_rdf* rdf;
01714         ecdsa_sig = d2i_ECDSA_SIG(NULL, (const unsigned char **)&data, sig_len);
01715         if(!ecdsa_sig) return NULL;
01716 
01717         /* "r | s". */
01718         data = LDNS_XMALLOC(unsigned char,
01719                 BN_num_bytes(ecdsa_sig->r) + BN_num_bytes(ecdsa_sig->s));
01720         if(!data) {
01721                 ECDSA_SIG_free(ecdsa_sig);
01722                 return NULL;
01723         }
01724         BN_bn2bin(ecdsa_sig->r, data);
01725         BN_bn2bin(ecdsa_sig->s, data+BN_num_bytes(ecdsa_sig->r));
01726         rdf = ldns_rdf_new(LDNS_RDF_TYPE_B64, (size_t)(
01727                 BN_num_bytes(ecdsa_sig->r) + BN_num_bytes(ecdsa_sig->s)), data);
01728         ECDSA_SIG_free(ecdsa_sig);
01729         return rdf;
01730 }
01731 
01732 ldns_status
01733 ldns_convert_ecdsa_rrsig_rdf2asn1(ldns_buffer *target_buffer,
01734         const ldns_rdf *sig_rdf)
01735 {
01736         ECDSA_SIG* sig;
01737         int raw_sig_len;
01738         long bnsize = (long)ldns_rdf_size(sig_rdf) / 2;
01739         /* if too short, or not even length, do not bother */
01740         if(bnsize < 16 || (size_t)bnsize*2 != ldns_rdf_size(sig_rdf))
01741                 return LDNS_STATUS_ERR;
01742         
01743         /* use the raw data to parse two evenly long BIGNUMs, "r | s". */
01744         sig = ECDSA_SIG_new();
01745         if(!sig) return LDNS_STATUS_MEM_ERR;
01746         sig->r = BN_bin2bn((const unsigned char*)ldns_rdf_data(sig_rdf),
01747                 bnsize, sig->r);
01748         sig->s = BN_bin2bn((const unsigned char*)ldns_rdf_data(sig_rdf)+bnsize,
01749                 bnsize, sig->s);
01750         if(!sig->r || !sig->s) {
01751                 ECDSA_SIG_free(sig);
01752                 return LDNS_STATUS_MEM_ERR;
01753         }
01754 
01755         raw_sig_len = i2d_ECDSA_SIG(sig, NULL);
01756         if (ldns_buffer_reserve(target_buffer, (size_t) raw_sig_len)) {
01757                 unsigned char* pp = (unsigned char*)
01758                         ldns_buffer_current(target_buffer);
01759                 raw_sig_len = i2d_ECDSA_SIG(sig, &pp);
01760                 ldns_buffer_skip(target_buffer, (ssize_t) raw_sig_len);
01761         }
01762         ECDSA_SIG_free(sig);
01763 
01764         return ldns_buffer_status(target_buffer);
01765 }
01766 
01767 #endif /* S_SPLINT_S */
01768 #endif /* USE_ECDSA */
01769 #endif /* HAVE_SSL */