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 
00747         bitmap_rdf = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_NSEC,
00748                                                                 cur_data_size,
00749                                                                 data);
00750 
00751         LDNS_FREE(bitmap);
00752         LDNS_FREE(data);
00753 
00754         return bitmap_rdf;
00755 }
00756 
00757 int
00758 ldns_dnssec_rrsets_contains_type(ldns_dnssec_rrsets *rrsets,
00759                                  ldns_rr_type type)
00760 {
00761         ldns_dnssec_rrsets *cur_rrset = rrsets;
00762         while (cur_rrset) {
00763                 if (cur_rrset->type == type) {
00764                         return 1;
00765                 }
00766                 cur_rrset = cur_rrset->next;
00767         }
00768         return 0;
00769 }
00770 
00771 ldns_rr *
00772 ldns_dnssec_create_nsec(ldns_dnssec_name *from,
00773                         ldns_dnssec_name *to,
00774                         ldns_rr_type nsec_type)
00775 {
00776         ldns_rr *nsec_rr;
00777         ldns_rr_type types[65536];
00778         size_t type_count = 0;
00779         ldns_dnssec_rrsets *cur_rrsets;
00780         int on_delegation_point;
00781 
00782         if (!from || !to || (nsec_type != LDNS_RR_TYPE_NSEC)) {
00783                 return NULL;
00784         }
00785 
00786         nsec_rr = ldns_rr_new();
00787         ldns_rr_set_type(nsec_rr, nsec_type);
00788         ldns_rr_set_owner(nsec_rr, ldns_rdf_clone(ldns_dnssec_name_name(from)));
00789         ldns_rr_push_rdf(nsec_rr, ldns_rdf_clone(ldns_dnssec_name_name(to)));
00790 
00791         on_delegation_point = ldns_dnssec_rrsets_contains_type(
00792                         from->rrsets, LDNS_RR_TYPE_NS)
00793                 && !ldns_dnssec_rrsets_contains_type(
00794                         from->rrsets, LDNS_RR_TYPE_SOA);
00795 
00796         cur_rrsets = from->rrsets;
00797         while (cur_rrsets) {
00798                 /* Do not include non-authoritative rrsets on the delegation point
00799                  * in the type bitmap */
00800                 if ((on_delegation_point && (
00801                                 cur_rrsets->type == LDNS_RR_TYPE_NS 
00802                              || cur_rrsets->type == LDNS_RR_TYPE_DS))
00803                         || (!on_delegation_point &&
00804                                 cur_rrsets->type != LDNS_RR_TYPE_RRSIG
00805                              && cur_rrsets->type != LDNS_RR_TYPE_NSEC)) {
00806 
00807                         types[type_count] = cur_rrsets->type;
00808                         type_count++;
00809                 }
00810                 cur_rrsets = cur_rrsets->next;
00811 
00812         }
00813         types[type_count] = LDNS_RR_TYPE_RRSIG;
00814         type_count++;
00815         types[type_count] = LDNS_RR_TYPE_NSEC;
00816         type_count++;
00817 
00818         ldns_rr_push_rdf(nsec_rr, ldns_dnssec_create_nsec_bitmap(types,
00819                                        type_count,
00820                                        nsec_type));
00821 
00822         return nsec_rr;
00823 }
00824 
00825 ldns_rr *
00826 ldns_dnssec_create_nsec3(ldns_dnssec_name *from,
00827                                         ldns_dnssec_name *to,
00828                                         ldns_rdf *zone_name,
00829                                         uint8_t algorithm,
00830                                         uint8_t flags,
00831                                         uint16_t iterations,
00832                                         uint8_t salt_length,
00833                                         uint8_t *salt)
00834 {
00835         ldns_rr *nsec_rr;
00836         ldns_rr_type types[65536];
00837         size_t type_count = 0;
00838         ldns_dnssec_rrsets *cur_rrsets;
00839         ldns_status status;
00840         int on_delegation_point;
00841 
00842         if (!from) {
00843                 return NULL;
00844         }
00845 
00846         nsec_rr = ldns_rr_new_frm_type(LDNS_RR_TYPE_NSEC3);
00847         ldns_rr_set_owner(nsec_rr,
00848                           ldns_nsec3_hash_name(ldns_dnssec_name_name(from),
00849                           algorithm,
00850                           iterations,
00851                           salt_length,
00852                           salt));
00853         status = ldns_dname_cat(ldns_rr_owner(nsec_rr), zone_name);
00854         if(status != LDNS_STATUS_OK) {
00855                 ldns_rr_free(nsec_rr);
00856                 return NULL;
00857         }
00858         ldns_nsec3_add_param_rdfs(nsec_rr,
00859                                   algorithm,
00860                                   flags,
00861                                   iterations,
00862                                   salt_length,
00863                                   salt);
00864 
00865         on_delegation_point = ldns_dnssec_rrsets_contains_type(
00866                         from->rrsets, LDNS_RR_TYPE_NS)
00867                 && !ldns_dnssec_rrsets_contains_type(
00868                         from->rrsets, LDNS_RR_TYPE_SOA);
00869         cur_rrsets = from->rrsets;
00870         while (cur_rrsets) {
00871                 /* Do not include non-authoritative rrsets on the delegation point
00872                  * in the type bitmap. Potentionally not skipping insecure
00873                  * delegation should have been done earlier, in function
00874                  * ldns_dnssec_zone_create_nsec3s, or even earlier in:
00875                  * ldns_dnssec_zone_sign_nsec3_flg .
00876                  */
00877                 if ((on_delegation_point && (
00878                                 cur_rrsets->type == LDNS_RR_TYPE_NS
00879                              || cur_rrsets->type == LDNS_RR_TYPE_DS))
00880                         || (!on_delegation_point &&
00881                                 cur_rrsets->type != LDNS_RR_TYPE_RRSIG)) {
00882 
00883                         types[type_count] = cur_rrsets->type;
00884                         type_count++;
00885                 }
00886                 cur_rrsets = cur_rrsets->next;
00887         }
00888         /* always add rrsig type if this is not an unsigned
00889          * delegation
00890          */
00891         if (type_count > 0 &&
00892             !(type_count == 1 && types[0] == LDNS_RR_TYPE_NS)) {
00893                 types[type_count] = LDNS_RR_TYPE_RRSIG;
00894                 type_count++;
00895         }
00896 
00897         /* leave next rdata empty if they weren't precomputed yet */
00898         if (to && to->hashed_name) {
00899                 (void) ldns_rr_set_rdf(nsec_rr,
00900                                        ldns_rdf_clone(to->hashed_name),
00901                                        4);
00902         } else {
00903                 (void) ldns_rr_set_rdf(nsec_rr, NULL, 4);
00904         }
00905 
00906         ldns_rr_push_rdf(nsec_rr,
00907                          ldns_dnssec_create_nsec_bitmap(types,
00908                          type_count,
00909                          LDNS_RR_TYPE_NSEC3));
00910 
00911         return nsec_rr;
00912 }
00913 
00914 ldns_rr *
00915 ldns_create_nsec(ldns_rdf *cur_owner, ldns_rdf *next_owner, ldns_rr_list *rrs)
00916 {
00917         /* we do not do any check here - garbage in, garbage out */
00918 
00919         /* the the start and end names - get the type from the
00920          * before rrlist */
00921 
00922         /* inefficient, just give it a name, a next name, and a list of rrs */
00923         /* we make 1 big uberbitmap first, then windows */
00924         /* todo: make something more efficient :) */
00925         uint16_t i;
00926         ldns_rr *i_rr;
00927         uint16_t i_type;
00928 
00929         ldns_rr *nsec = NULL;
00930         ldns_rr_type i_type_list[65536];
00931         size_t type_count = 0;
00932 
00933         nsec = ldns_rr_new();
00934         ldns_rr_set_type(nsec, LDNS_RR_TYPE_NSEC);
00935         ldns_rr_set_owner(nsec, ldns_rdf_clone(cur_owner));
00936         ldns_rr_push_rdf(nsec, ldns_rdf_clone(next_owner));
00937 
00938         for (i = 0; i < ldns_rr_list_rr_count(rrs); i++) {
00939                 i_rr = ldns_rr_list_rr(rrs, i);
00940                 if (ldns_rdf_compare(cur_owner,
00941                                                  ldns_rr_owner(i_rr)) == 0) {
00942                         i_type = ldns_rr_get_type(i_rr);
00943                         if (i_type != LDNS_RR_TYPE_RRSIG && i_type != LDNS_RR_TYPE_NSEC) {
00944                                 if (type_count == 0 || i_type_list[type_count-1] != i_type) {
00945                                         i_type_list[type_count] = i_type;
00946                                         type_count++;
00947                                 }
00948                         }
00949                 }
00950         }
00951 
00952         i_type_list[type_count] = LDNS_RR_TYPE_RRSIG;
00953         type_count++;
00954         i_type_list[type_count] = LDNS_RR_TYPE_NSEC;
00955         type_count++;
00956 
00957         ldns_rr_push_rdf(nsec,
00958                                   ldns_dnssec_create_nsec_bitmap(i_type_list,
00959                                                 type_count, LDNS_RR_TYPE_NSEC));
00960 
00961         return nsec;
00962 }
00963 
00964 ldns_rdf *
00965 ldns_nsec3_hash_name(ldns_rdf *name,
00966                                  uint8_t algorithm,
00967                                  uint16_t iterations,
00968                                  uint8_t salt_length,
00969                                  uint8_t *salt)
00970 {
00971         size_t hashed_owner_str_len;
00972         ldns_rdf *cann;
00973         ldns_rdf *hashed_owner;
00974         unsigned char *hashed_owner_str;
00975         char *hashed_owner_b32;
00976         size_t hashed_owner_b32_len;
00977         uint32_t cur_it;
00978         /* define to contain the largest possible hash, which is
00979          * sha1 at the moment */
00980         unsigned char hash[LDNS_SHA1_DIGEST_LENGTH];
00981         ldns_status status;
00982 
00983         /* TODO: mnemonic list for hash algs SHA-1, default to 1 now (sha1) */
00984         if (algorithm != LDNS_SHA1) {
00985                 return NULL;
00986         }
00987 
00988         /* prepare the owner name according to the draft section bla */
00989         cann = ldns_rdf_clone(name);
00990         if(!cann) {
00991                 fprintf(stderr, "Memory error\n");
00992                 return NULL;
00993         }
00994         ldns_dname2canonical(cann);
00995 
00996         hashed_owner_str_len = salt_length + ldns_rdf_size(cann);
00997         hashed_owner_str = LDNS_XMALLOC(unsigned char, hashed_owner_str_len);
00998         if(!hashed_owner_str) {
00999                 ldns_rdf_deep_free(cann);
01000                 return NULL;
01001         }
01002         memcpy(hashed_owner_str, ldns_rdf_data(cann), ldns_rdf_size(cann));
01003         memcpy(hashed_owner_str + ldns_rdf_size(cann), salt, salt_length);
01004         ldns_rdf_deep_free(cann);
01005 
01006         for (cur_it = iterations + 1; cur_it > 0; cur_it--) {
01007                 (void) ldns_sha1((unsigned char *) hashed_owner_str,
01008                                  (unsigned int) hashed_owner_str_len, hash);
01009 
01010                 LDNS_FREE(hashed_owner_str);
01011                 hashed_owner_str_len = salt_length + LDNS_SHA1_DIGEST_LENGTH;
01012                 hashed_owner_str = LDNS_XMALLOC(unsigned char, hashed_owner_str_len);
01013                 if (!hashed_owner_str) {
01014                         return NULL;
01015                 }
01016                 memcpy(hashed_owner_str, hash, LDNS_SHA1_DIGEST_LENGTH);
01017                 memcpy(hashed_owner_str + LDNS_SHA1_DIGEST_LENGTH, salt, salt_length);
01018                 hashed_owner_str_len = LDNS_SHA1_DIGEST_LENGTH + salt_length;
01019         }
01020 
01021         LDNS_FREE(hashed_owner_str);
01022         hashed_owner_str = hash;
01023         hashed_owner_str_len = LDNS_SHA1_DIGEST_LENGTH;
01024 
01025         hashed_owner_b32 = LDNS_XMALLOC(char,
01026                   ldns_b32_ntop_calculate_size(hashed_owner_str_len) + 1);
01027         if(!hashed_owner_b32) {
01028                 return NULL;
01029         }
01030         hashed_owner_b32_len = (size_t) ldns_b32_ntop_extended_hex(
01031                 (uint8_t *) hashed_owner_str,
01032                 hashed_owner_str_len,
01033                 hashed_owner_b32,
01034                 ldns_b32_ntop_calculate_size(hashed_owner_str_len)+1);
01035         if (hashed_owner_b32_len < 1) {
01036                 fprintf(stderr, "Error in base32 extended hex encoding ");
01037                 fprintf(stderr, "of hashed owner name (name: ");
01038                 ldns_rdf_print(stderr, name);
01039                 fprintf(stderr, ", return code: %u)\n",
01040                         (unsigned int) hashed_owner_b32_len);
01041                 LDNS_FREE(hashed_owner_b32);
01042                 return NULL;
01043         }
01044         hashed_owner_b32[hashed_owner_b32_len] = '\0';
01045 
01046         status = ldns_str2rdf_dname(&hashed_owner, hashed_owner_b32);
01047         if (status != LDNS_STATUS_OK) {
01048                 fprintf(stderr, "Error creating rdf from %s\n", hashed_owner_b32);
01049                 LDNS_FREE(hashed_owner_b32);
01050                 return NULL;
01051         }
01052 
01053         LDNS_FREE(hashed_owner_b32);
01054         return hashed_owner;
01055 }
01056 
01057 void
01058 ldns_nsec3_add_param_rdfs(ldns_rr *rr,
01059                                          uint8_t algorithm,
01060                                          uint8_t flags,
01061                                          uint16_t iterations,
01062                                          uint8_t salt_length,
01063                                          uint8_t *salt)
01064 {
01065         ldns_rdf *salt_rdf = NULL;
01066         uint8_t *salt_data = NULL;
01067         ldns_rdf *old;
01068 
01069         old = ldns_rr_set_rdf(rr,
01070                               ldns_rdf_new_frm_data(LDNS_RDF_TYPE_INT8,
01071                                                     1, (void*)&algorithm),
01072                               0);
01073         if (old) ldns_rdf_deep_free(old);
01074 
01075         old = ldns_rr_set_rdf(rr,
01076                               ldns_rdf_new_frm_data(LDNS_RDF_TYPE_INT8,
01077                                                     1, (void*)&flags),
01078                               1);
01079         if (old) ldns_rdf_deep_free(old);
01080 
01081         old = ldns_rr_set_rdf(rr,
01082                           ldns_native2rdf_int16(LDNS_RDF_TYPE_INT16,
01083                                                 iterations),
01084                               2);
01085         if (old) ldns_rdf_deep_free(old);
01086 
01087         salt_data = LDNS_XMALLOC(uint8_t, salt_length + 1);
01088         if(!salt_data) {
01089                 /* no way to return error */
01090                 return;
01091         }
01092         salt_data[0] = salt_length;
01093         memcpy(salt_data + 1, salt, salt_length);
01094         salt_rdf = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_NSEC3_SALT,
01095                                                            salt_length + 1,
01096                                                            salt_data);
01097         if(!salt_rdf) {
01098                 LDNS_FREE(salt_data);
01099                 /* no way to return error */
01100                 return;
01101         }
01102 
01103         old = ldns_rr_set_rdf(rr, salt_rdf, 3);
01104         if (old) ldns_rdf_deep_free(old);
01105         LDNS_FREE(salt_data);
01106 }
01107 
01108 static int
01109 rr_list_delegation_only(ldns_rdf *origin, ldns_rr_list *rr_list)
01110 {
01111         size_t i;
01112         ldns_rr *cur_rr;
01113         if (!origin || !rr_list) return 0;
01114         for (i = 0; i < ldns_rr_list_rr_count(rr_list); i++) {
01115                 cur_rr = ldns_rr_list_rr(rr_list, i);
01116                 if (ldns_dname_compare(ldns_rr_owner(cur_rr), origin) == 0) {
01117                         return 0;
01118                 }
01119                 if (ldns_rr_get_type(cur_rr) != LDNS_RR_TYPE_NS) {
01120                         return 0;
01121                 }
01122         }
01123         return 1;
01124 }
01125 
01126 /* this will NOT return the NSEC3  completed, you will have to run the
01127    finalize function on the rrlist later! */
01128 ldns_rr *
01129 ldns_create_nsec3(ldns_rdf *cur_owner,
01130                   ldns_rdf *cur_zone,
01131                   ldns_rr_list *rrs,
01132                   uint8_t algorithm,
01133                   uint8_t flags,
01134                   uint16_t iterations,
01135                   uint8_t salt_length,
01136                   uint8_t *salt,
01137                   bool emptynonterminal)
01138 {
01139         size_t i;
01140         ldns_rr *i_rr;
01141         uint16_t i_type;
01142 
01143         ldns_rr *nsec = NULL;
01144         ldns_rdf *hashed_owner = NULL;
01145 
01146         ldns_status status;
01147 
01148     ldns_rr_type i_type_list[1024];
01149         size_t type_count = 0;
01150 
01151         hashed_owner = ldns_nsec3_hash_name(cur_owner,
01152                                                                  algorithm,
01153                                                                  iterations,
01154                                                                  salt_length,
01155                                                                  salt);
01156         status = ldns_dname_cat(hashed_owner, cur_zone);
01157         if(status != LDNS_STATUS_OK)
01158                 return NULL;
01159 
01160         nsec = ldns_rr_new_frm_type(LDNS_RR_TYPE_NSEC3);
01161         if(!nsec)
01162                 return NULL;
01163         ldns_rr_set_type(nsec, LDNS_RR_TYPE_NSEC3);
01164         ldns_rr_set_owner(nsec, hashed_owner);
01165 
01166         ldns_nsec3_add_param_rdfs(nsec,
01167                                                  algorithm,
01168                                                  flags,
01169                                                  iterations,
01170                                                  salt_length,
01171                                                  salt);
01172         (void) ldns_rr_set_rdf(nsec, NULL, 4);
01173 
01174 
01175         for (i = 0; i < ldns_rr_list_rr_count(rrs); i++) {
01176                 i_rr = ldns_rr_list_rr(rrs, i);
01177                 if (ldns_rdf_compare(cur_owner,
01178                                                  ldns_rr_owner(i_rr)) == 0) {
01179                         i_type = ldns_rr_get_type(i_rr);
01180                         if (type_count == 0 || i_type_list[type_count-1] != i_type) {
01181                                 i_type_list[type_count] = i_type;
01182                                 type_count++;
01183                         }
01184                 }
01185         }
01186 
01187         /* add RRSIG anyway, but only if this is not an ENT or
01188          * an unsigned delegation */
01189         if (!emptynonterminal && !rr_list_delegation_only(cur_zone, rrs)) {
01190                 i_type_list[type_count] = LDNS_RR_TYPE_RRSIG;
01191                 type_count++;
01192         }
01193 
01194         /* and SOA if owner == zone */
01195         if (ldns_dname_compare(cur_zone, cur_owner) == 0) {
01196                 i_type_list[type_count] = LDNS_RR_TYPE_SOA;
01197                 type_count++;
01198         }
01199 
01200         ldns_rr_push_rdf(nsec,
01201                                   ldns_dnssec_create_nsec_bitmap(i_type_list,
01202                                                 type_count, LDNS_RR_TYPE_NSEC3));
01203 
01204         return nsec;
01205 }
01206 
01207 uint8_t
01208 ldns_nsec3_algorithm(const ldns_rr *nsec3_rr)
01209 {
01210         if (nsec3_rr && 
01211               (ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3 ||
01212                ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3PARAM)
01213             && (ldns_rr_rdf(nsec3_rr, 0) != NULL)
01214             && ldns_rdf_size(ldns_rr_rdf(nsec3_rr, 0)) > 0) {
01215                 return ldns_rdf2native_int8(ldns_rr_rdf(nsec3_rr, 0));
01216         }
01217         return 0;
01218 }
01219 
01220 uint8_t
01221 ldns_nsec3_flags(const ldns_rr *nsec3_rr)
01222 {
01223         if (nsec3_rr && 
01224               (ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3 ||
01225                ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3PARAM)
01226             && (ldns_rr_rdf(nsec3_rr, 1) != NULL)
01227             && ldns_rdf_size(ldns_rr_rdf(nsec3_rr, 1)) > 0) {
01228                 return ldns_rdf2native_int8(ldns_rr_rdf(nsec3_rr, 1));
01229         }
01230         return 0;
01231 }
01232 
01233 bool
01234 ldns_nsec3_optout(const ldns_rr *nsec3_rr)
01235 {
01236         return (ldns_nsec3_flags(nsec3_rr) & LDNS_NSEC3_VARS_OPTOUT_MASK);
01237 }
01238 
01239 uint16_t
01240 ldns_nsec3_iterations(const ldns_rr *nsec3_rr)
01241 {
01242         if (nsec3_rr &&
01243               (ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3 ||
01244                ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3PARAM)
01245             && (ldns_rr_rdf(nsec3_rr, 2) != NULL)
01246             && ldns_rdf_size(ldns_rr_rdf(nsec3_rr, 2)) > 0) {
01247                 return ldns_rdf2native_int16(ldns_rr_rdf(nsec3_rr, 2));
01248         }
01249         return 0;
01250         
01251 }
01252 
01253 ldns_rdf *
01254 ldns_nsec3_salt(const ldns_rr *nsec3_rr)
01255 {
01256         if (nsec3_rr && 
01257               (ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3 ||
01258                ldns_rr_get_type(nsec3_rr) == LDNS_RR_TYPE_NSEC3PARAM)
01259             ) {
01260                 return ldns_rr_rdf(nsec3_rr, 3);
01261         }
01262         return NULL;
01263 }
01264 
01265 uint8_t
01266 ldns_nsec3_salt_length(const ldns_rr *nsec3_rr)
01267 {
01268         ldns_rdf *salt_rdf = ldns_nsec3_salt(nsec3_rr);
01269         if (salt_rdf && ldns_rdf_size(salt_rdf) > 0) {
01270                 return (uint8_t) ldns_rdf_data(salt_rdf)[0];
01271         }
01272         return 0;
01273 }
01274 
01275 /* allocs data, free with LDNS_FREE() */
01276 uint8_t *
01277 ldns_nsec3_salt_data(const ldns_rr *nsec3_rr)
01278 {
01279         uint8_t salt_length;
01280         uint8_t *salt;
01281 
01282         ldns_rdf *salt_rdf = ldns_nsec3_salt(nsec3_rr);
01283         if (salt_rdf && ldns_rdf_size(salt_rdf) > 0) {
01284                 salt_length = ldns_rdf_data(salt_rdf)[0];
01285                 salt = LDNS_XMALLOC(uint8_t, salt_length);
01286                 if(!salt) return NULL;
01287                 memcpy(salt, &ldns_rdf_data(salt_rdf)[1], salt_length);
01288                 return salt;
01289         }
01290         return NULL;
01291 }
01292 
01293 ldns_rdf *
01294 ldns_nsec3_next_owner(const ldns_rr *nsec3_rr)
01295 {
01296         if (!nsec3_rr || ldns_rr_get_type(nsec3_rr) != LDNS_RR_TYPE_NSEC3) {
01297                 return NULL;
01298         } else {
01299                 return ldns_rr_rdf(nsec3_rr, 4);
01300         }
01301 }
01302 
01303 ldns_rdf *
01304 ldns_nsec3_bitmap(const ldns_rr *nsec3_rr)
01305 {
01306         if (!nsec3_rr || ldns_rr_get_type(nsec3_rr) != LDNS_RR_TYPE_NSEC3) {
01307                 return NULL;
01308         } else {
01309                 return ldns_rr_rdf(nsec3_rr, 5);
01310         }
01311 }
01312 
01313 ldns_rdf *
01314 ldns_nsec3_hash_name_frm_nsec3(const ldns_rr *nsec, ldns_rdf *name)
01315 {
01316         uint8_t algorithm;
01317         uint16_t iterations;
01318         uint8_t salt_length;
01319         uint8_t *salt = 0;
01320 
01321         ldns_rdf *hashed_owner;
01322 
01323         algorithm = ldns_nsec3_algorithm(nsec);
01324         salt_length = ldns_nsec3_salt_length(nsec);
01325         salt = ldns_nsec3_salt_data(nsec);
01326         iterations = ldns_nsec3_iterations(nsec);
01327 
01328         hashed_owner = ldns_nsec3_hash_name(name,
01329                                                                  algorithm,
01330                                                                  iterations,
01331                                                                  salt_length,
01332                                                                  salt);
01333 
01334         LDNS_FREE(salt);
01335         return hashed_owner;
01336 }
01337 
01338 bool
01339 ldns_nsec_bitmap_covers_type(const ldns_rdf *nsec_bitmap, ldns_rr_type type)
01340 {
01341         uint8_t window_block_nr;
01342         uint8_t bitmap_length;
01343         uint16_t cur_type;
01344         uint16_t pos = 0;
01345         uint16_t bit_pos;
01346         uint8_t *data;
01347 
01348         if (nsec_bitmap == NULL) {
01349                 return false;
01350         }
01351         data = ldns_rdf_data(nsec_bitmap);
01352         while(pos < ldns_rdf_size(nsec_bitmap)) {
01353                 window_block_nr = data[pos];
01354                 bitmap_length = data[pos + 1];
01355                 pos += 2;
01356 
01357                 for (bit_pos = 0; bit_pos < (bitmap_length) * 8; bit_pos++) {
01358                         if (ldns_get_bit(&data[pos], bit_pos)) {
01359                                 cur_type = 256 * (uint16_t) window_block_nr + bit_pos;
01360                                 if (cur_type == type) {
01361                                         return true;
01362                                 }
01363                         }
01364                 }
01365 
01366                 pos += (uint16_t) bitmap_length;
01367         }
01368         return false;
01369 }
01370 
01371 bool
01372 ldns_nsec_covers_name(const ldns_rr *nsec, const ldns_rdf *name)
01373 {
01374         ldns_rdf *nsec_owner = ldns_rr_owner(nsec);
01375         ldns_rdf *hash_next;
01376         char *next_hash_str;
01377         ldns_rdf *nsec_next = NULL;
01378         ldns_status status;
01379         ldns_rdf *chopped_dname;
01380         bool result;
01381 
01382         if (ldns_rr_get_type(nsec) == LDNS_RR_TYPE_NSEC) {
01383                 if (ldns_rr_rdf(nsec, 0) != NULL) {
01384                         nsec_next = ldns_rdf_clone(ldns_rr_rdf(nsec, 0));
01385                 } else {
01386                         return false;
01387                 }
01388         } else if (ldns_rr_get_type(nsec) == LDNS_RR_TYPE_NSEC3) {
01389                 hash_next = ldns_nsec3_next_owner(nsec);
01390                 next_hash_str = ldns_rdf2str(hash_next);
01391                 nsec_next = ldns_dname_new_frm_str(next_hash_str);
01392                 LDNS_FREE(next_hash_str);
01393                 chopped_dname = ldns_dname_left_chop(nsec_owner);
01394                 status = ldns_dname_cat(nsec_next, chopped_dname);
01395                 ldns_rdf_deep_free(chopped_dname);
01396                 if (status != LDNS_STATUS_OK) {
01397                         printf("error catting: %s\n", ldns_get_errorstr_by_id(status));
01398                 }
01399         } else {
01400                 ldns_rdf_deep_free(nsec_next);
01401                 return false;
01402         }
01403 
01404         /* in the case of the last nsec */
01405         if(ldns_dname_compare(nsec_owner, nsec_next) > 0) {
01406                 result = (ldns_dname_compare(nsec_owner, name) <= 0 ||
01407                                 ldns_dname_compare(name, nsec_next) < 0);
01408         } else {
01409                 result = (ldns_dname_compare(nsec_owner, name) <= 0 &&
01410                           ldns_dname_compare(name, nsec_next) < 0);
01411         }
01412 
01413         ldns_rdf_deep_free(nsec_next);
01414         return result;
01415 }
01416 
01417 #ifdef HAVE_SSL
01418 /* sig may be null - if so look in the packet */
01419 
01420 ldns_status
01421 ldns_pkt_verify_time(ldns_pkt *p, ldns_rr_type t, ldns_rdf *o, 
01422                 ldns_rr_list *k, ldns_rr_list *s, 
01423                 time_t check_time, ldns_rr_list *good_keys)
01424 {
01425         ldns_rr_list *rrset;
01426         ldns_rr_list *sigs;
01427         ldns_rr_list *sigs_covered;
01428         ldns_rdf *rdf_t;
01429         ldns_rr_type t_netorder;
01430 
01431         if (!k) {
01432                 return LDNS_STATUS_ERR;
01433                 /* return LDNS_STATUS_CRYPTO_NO_DNSKEY; */
01434         }
01435 
01436         if (t == LDNS_RR_TYPE_RRSIG) {
01437                 /* we don't have RRSIG(RRSIG) (yet? ;-) ) */
01438                 return LDNS_STATUS_ERR;
01439         }
01440 
01441         if (s) {
01442                 /* if s is not NULL, the sigs are given to use */
01443                 sigs = s;
01444         } else {
01445                 /* otherwise get them from the packet */
01446                 sigs = ldns_pkt_rr_list_by_name_and_type(p, o, LDNS_RR_TYPE_RRSIG,
01447                                                                           LDNS_SECTION_ANY_NOQUESTION);
01448                 if (!sigs) {
01449                         /* no sigs */
01450                         return LDNS_STATUS_ERR;
01451                         /* return LDNS_STATUS_CRYPTO_NO_RRSIG; */
01452                 }
01453         }
01454 
01455         /* rrsig are subtyped, so now we need to find the correct
01456          * sigs for the type t
01457          */
01458         t_netorder = htons(t); /* rdf are in network order! */
01459         /* a type identifier is a 16-bit number, so the size is 2 bytes */
01460         rdf_t = ldns_rdf_new(LDNS_RDF_TYPE_TYPE,
01461                                          2,
01462                                          &t_netorder);
01463         sigs_covered = ldns_rr_list_subtype_by_rdf(sigs, rdf_t, 0);
01464 
01465         rrset = ldns_pkt_rr_list_by_name_and_type(p,
01466                                                                           o,
01467                                                                           t,
01468                                                                           LDNS_SECTION_ANY_NOQUESTION);
01469 
01470         if (!rrset) {
01471                 return LDNS_STATUS_ERR;
01472         }
01473 
01474         if (!sigs_covered) {
01475                 return LDNS_STATUS_ERR;
01476         }
01477 
01478         return ldns_verify_time(rrset, sigs, k, check_time, good_keys);
01479 }
01480 
01481 ldns_status
01482 ldns_pkt_verify(ldns_pkt *p, ldns_rr_type t, ldns_rdf *o, 
01483                 ldns_rr_list *k, ldns_rr_list *s, ldns_rr_list *good_keys)
01484 {
01485         return ldns_pkt_verify_time(p, t, o, k, s, ldns_time(NULL), good_keys);
01486 }
01487 #endif /* HAVE_SSL */
01488 
01489 ldns_status
01490 ldns_dnssec_chain_nsec3_list(ldns_rr_list *nsec3_rrs)
01491 {
01492         size_t i;
01493         char *next_nsec_owner_str;
01494         ldns_rdf *next_nsec_owner_label;
01495         ldns_rdf *next_nsec_rdf;
01496         ldns_status status = LDNS_STATUS_OK;
01497 
01498         for (i = 0; i < ldns_rr_list_rr_count(nsec3_rrs); i++) {
01499                 if (i == ldns_rr_list_rr_count(nsec3_rrs) - 1) {
01500                         next_nsec_owner_label =
01501                                 ldns_dname_label(ldns_rr_owner(ldns_rr_list_rr(nsec3_rrs,
01502                                                                                                           0)), 0);
01503                         next_nsec_owner_str = ldns_rdf2str(next_nsec_owner_label);
01504                         if (next_nsec_owner_str[strlen(next_nsec_owner_str) - 1]
01505                             == '.') {
01506                                 next_nsec_owner_str[strlen(next_nsec_owner_str) - 1]
01507                                         = '\0';
01508                         }
01509                         status = ldns_str2rdf_b32_ext(&next_nsec_rdf,
01510                                                                         next_nsec_owner_str);
01511                         if (!ldns_rr_set_rdf(ldns_rr_list_rr(nsec3_rrs, i),
01512                                                          next_nsec_rdf, 4)) {
01513                                 /* todo: error */
01514                         }
01515 
01516                         ldns_rdf_deep_free(next_nsec_owner_label);
01517                         LDNS_FREE(next_nsec_owner_str);
01518                 } else {
01519                         next_nsec_owner_label =
01520                                 ldns_dname_label(ldns_rr_owner(ldns_rr_list_rr(nsec3_rrs,
01521                                                                                                           i + 1)),
01522                                                           0);
01523                         next_nsec_owner_str = ldns_rdf2str(next_nsec_owner_label);
01524                         if (next_nsec_owner_str[strlen(next_nsec_owner_str) - 1]
01525                             == '.') {
01526                                 next_nsec_owner_str[strlen(next_nsec_owner_str) - 1]
01527                                         = '\0';
01528                         }
01529                         status = ldns_str2rdf_b32_ext(&next_nsec_rdf,
01530                                                                         next_nsec_owner_str);
01531                         ldns_rdf_deep_free(next_nsec_owner_label);
01532                         LDNS_FREE(next_nsec_owner_str);
01533                         if (!ldns_rr_set_rdf(ldns_rr_list_rr(nsec3_rrs, i),
01534                                                          next_nsec_rdf, 4)) {
01535                                 /* todo: error */
01536                         }
01537                 }
01538         }
01539         return status;
01540 }
01541 
01542 int
01543 qsort_rr_compare_nsec3(const void *a, const void *b)
01544 {
01545         const ldns_rr *rr1 = * (const ldns_rr **) a;
01546         const ldns_rr *rr2 = * (const ldns_rr **) b;
01547         if (rr1 == NULL && rr2 == NULL) {
01548                 return 0;
01549         }
01550         if (rr1 == NULL) {
01551                 return -1;
01552         }
01553         if (rr2 == NULL) {
01554                 return 1;
01555         }
01556         return ldns_rdf_compare(ldns_rr_owner(rr1), ldns_rr_owner(rr2));
01557 }
01558 
01559 void
01560 ldns_rr_list_sort_nsec3(ldns_rr_list *unsorted)
01561 {
01562         qsort(unsorted->_rrs,
01563               ldns_rr_list_rr_count(unsorted),
01564               sizeof(ldns_rr *),
01565               qsort_rr_compare_nsec3);
01566 }
01567 
01568 int
01569 ldns_dnssec_default_add_to_signatures( ATTR_UNUSED(ldns_rr *sig)
01570                                      , ATTR_UNUSED(void *n)
01571                                      )
01572 {
01573         return LDNS_SIGNATURE_LEAVE_ADD_NEW;
01574 }
01575 
01576 int
01577 ldns_dnssec_default_leave_signatures( ATTR_UNUSED(ldns_rr *sig)
01578                                     , ATTR_UNUSED(void *n)
01579                                     )
01580 {
01581         return LDNS_SIGNATURE_LEAVE_NO_ADD;
01582 }
01583 
01584 int
01585 ldns_dnssec_default_delete_signatures( ATTR_UNUSED(ldns_rr *sig)
01586                                      , ATTR_UNUSED(void *n)
01587                                      )
01588 {
01589         return LDNS_SIGNATURE_REMOVE_NO_ADD;
01590 }
01591 
01592 int
01593 ldns_dnssec_default_replace_signatures( ATTR_UNUSED(ldns_rr *sig)
01594                                       , ATTR_UNUSED(void *n)
01595                                       )
01596 {
01597         return LDNS_SIGNATURE_REMOVE_ADD_NEW;
01598 }
01599 
01600 #ifdef HAVE_SSL
01601 ldns_rdf *
01602 ldns_convert_dsa_rrsig_asn12rdf(const ldns_buffer *sig,
01603                                                   const long sig_len)
01604 {
01605         ldns_rdf *sigdata_rdf;
01606         DSA_SIG *dsasig;
01607         unsigned char *dsasig_data = (unsigned char*)ldns_buffer_begin(sig);
01608         size_t byte_offset;
01609 
01610         dsasig = d2i_DSA_SIG(NULL,
01611                                          (const unsigned char **)&dsasig_data,
01612                                          sig_len);
01613         if (!dsasig) {
01614                 DSA_SIG_free(dsasig);
01615                 return NULL;
01616         }
01617 
01618         dsasig_data = LDNS_XMALLOC(unsigned char, 41);
01619         if(!dsasig_data) {
01620                 DSA_SIG_free(dsasig);
01621                 return NULL;
01622         }
01623         dsasig_data[0] = 0;
01624         byte_offset = (size_t) (20 - BN_num_bytes(dsasig->r));
01625         if (byte_offset > 20) {
01626                 DSA_SIG_free(dsasig);
01627                 LDNS_FREE(dsasig_data);
01628                 return NULL;
01629         }
01630         memset(&dsasig_data[1], 0, byte_offset);
01631         BN_bn2bin(dsasig->r, &dsasig_data[1 + byte_offset]);
01632         byte_offset = (size_t) (20 - BN_num_bytes(dsasig->s));
01633         if (byte_offset > 20) {
01634                 DSA_SIG_free(dsasig);
01635                 LDNS_FREE(dsasig_data);
01636                 return NULL;
01637         }
01638         memset(&dsasig_data[21], 0, byte_offset);
01639         BN_bn2bin(dsasig->s, &dsasig_data[21 + byte_offset]);
01640 
01641         sigdata_rdf = ldns_rdf_new(LDNS_RDF_TYPE_B64, 41, dsasig_data);
01642         if(!sigdata_rdf) {
01643                 LDNS_FREE(dsasig_data);
01644         }
01645         DSA_SIG_free(dsasig);
01646 
01647         return sigdata_rdf;
01648 }
01649 
01650 ldns_status
01651 ldns_convert_dsa_rrsig_rdf2asn1(ldns_buffer *target_buffer,
01652                                                   const ldns_rdf *sig_rdf)
01653 {
01654         /* the EVP api wants the DER encoding of the signature... */
01655         BIGNUM *R, *S;
01656         DSA_SIG *dsasig;
01657         unsigned char *raw_sig = NULL;
01658         int raw_sig_len;
01659 
01660         if(ldns_rdf_size(sig_rdf) < 1 + 2*SHA_DIGEST_LENGTH)
01661                 return LDNS_STATUS_SYNTAX_RDATA_ERR;
01662         /* extract the R and S field from the sig buffer */
01663         R = BN_new();
01664         if(!R) return LDNS_STATUS_MEM_ERR;
01665         (void) BN_bin2bn((unsigned char *) ldns_rdf_data(sig_rdf) + 1,
01666                          SHA_DIGEST_LENGTH, R);
01667         S = BN_new();
01668         if(!S) {
01669                 BN_free(R);
01670                 return LDNS_STATUS_MEM_ERR;
01671         }
01672         (void) BN_bin2bn((unsigned char *) ldns_rdf_data(sig_rdf) + 21,
01673                          SHA_DIGEST_LENGTH, S);
01674 
01675         dsasig = DSA_SIG_new();
01676         if (!dsasig) {
01677                 BN_free(R);
01678                 BN_free(S);
01679                 return LDNS_STATUS_MEM_ERR;
01680         }
01681 
01682         dsasig->r = R;
01683         dsasig->s = S;
01684 
01685         raw_sig_len = i2d_DSA_SIG(dsasig, &raw_sig);
01686         if (raw_sig_len < 0) {
01687                 DSA_SIG_free(dsasig);
01688                 free(raw_sig);
01689                 return LDNS_STATUS_SSL_ERR;
01690         }
01691         if (ldns_buffer_reserve(target_buffer, (size_t) raw_sig_len)) {
01692                 ldns_buffer_write(target_buffer, raw_sig, (size_t)raw_sig_len);
01693         }
01694 
01695         DSA_SIG_free(dsasig);
01696         free(raw_sig);
01697 
01698         return ldns_buffer_status(target_buffer);
01699 }
01700 
01701 #ifdef USE_ECDSA
01702 #ifndef S_SPLINT_S
01703 ldns_rdf *
01704 ldns_convert_ecdsa_rrsig_asn12rdf(const ldns_buffer *sig, const long sig_len)
01705 {
01706         ECDSA_SIG* ecdsa_sig;
01707         unsigned char *data = (unsigned char*)ldns_buffer_begin(sig);
01708         ldns_rdf* rdf;
01709         ecdsa_sig = d2i_ECDSA_SIG(NULL, (const unsigned char **)&data, sig_len);
01710         if(!ecdsa_sig) return NULL;
01711 
01712         /* "r | s". */
01713         data = LDNS_XMALLOC(unsigned char,
01714                 BN_num_bytes(ecdsa_sig->r) + BN_num_bytes(ecdsa_sig->s));
01715         if(!data) {
01716                 ECDSA_SIG_free(ecdsa_sig);
01717                 return NULL;
01718         }
01719         BN_bn2bin(ecdsa_sig->r, data);
01720         BN_bn2bin(ecdsa_sig->s, data+BN_num_bytes(ecdsa_sig->r));
01721         rdf = ldns_rdf_new(LDNS_RDF_TYPE_B64, (size_t)(
01722                 BN_num_bytes(ecdsa_sig->r) + BN_num_bytes(ecdsa_sig->s)), data);
01723         ECDSA_SIG_free(ecdsa_sig);
01724         return rdf;
01725 }
01726 
01727 ldns_status
01728 ldns_convert_ecdsa_rrsig_rdf2asn1(ldns_buffer *target_buffer,
01729         const ldns_rdf *sig_rdf)
01730 {
01731         ECDSA_SIG* sig;
01732         int raw_sig_len;
01733         long bnsize = (long)ldns_rdf_size(sig_rdf) / 2;
01734         /* if too short, or not even length, do not bother */
01735         if(bnsize < 16 || (size_t)bnsize*2 != ldns_rdf_size(sig_rdf))
01736                 return LDNS_STATUS_ERR;
01737         
01738         /* use the raw data to parse two evenly long BIGNUMs, "r | s". */
01739         sig = ECDSA_SIG_new();
01740         if(!sig) return LDNS_STATUS_MEM_ERR;
01741         sig->r = BN_bin2bn((const unsigned char*)ldns_rdf_data(sig_rdf),
01742                 bnsize, sig->r);
01743         sig->s = BN_bin2bn((const unsigned char*)ldns_rdf_data(sig_rdf)+bnsize,
01744                 bnsize, sig->s);
01745         if(!sig->r || !sig->s) {
01746                 ECDSA_SIG_free(sig);
01747                 return LDNS_STATUS_MEM_ERR;
01748         }
01749 
01750         raw_sig_len = i2d_ECDSA_SIG(sig, NULL);
01751         if (ldns_buffer_reserve(target_buffer, (size_t) raw_sig_len)) {
01752                 unsigned char* pp = (unsigned char*)
01753                         ldns_buffer_current(target_buffer);
01754                 raw_sig_len = i2d_ECDSA_SIG(sig, &pp);
01755                 ldns_buffer_skip(target_buffer, (ssize_t) raw_sig_len);
01756         }
01757         ECDSA_SIG_free(sig);
01758 
01759         return ldns_buffer_status(target_buffer);
01760 }
01761 
01762 #endif /* S_SPLINT_S */
01763 #endif /* USE_ECDSA */
01764 #endif /* HAVE_SSL */