contrib/bind-9.5.2/lib/dns/tkey.c

   1 /*
   2  * Copyright (C) 2004-2008  Internet Systems Consortium, Inc. ("ISC")
   3  * Copyright (C) 1999-2001, 2003  Internet Software Consortium.
   4  *
   5  * Permission to use, copy, modify, and/or distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
  10  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
  11  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
  12  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
  13  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
  14  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  15  * PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 /*
  19  * $Id: tkey.c,v 1.87.2.3 2008/04/03 00:47:46 marka Exp $
  20  */
  21 /*! \file */
  22 #include <config.h>
  23
  24 #include <isc/buffer.h>
  25 #include <isc/entropy.h>
  26 #include <isc/md5.h>
  27 #include <isc/mem.h>
  28 #include <isc/string.h>
  29 #include <isc/util.h>
  30
  31 #include <dns/dnssec.h>
  32 #include <dns/fixedname.h>
  33 #include <dns/keyvalues.h>
  34 #include <dns/log.h>
  35 #include <dns/message.h>
  36 #include <dns/name.h>
  37 #include <dns/rdata.h>
  38 #include <dns/rdatalist.h>
  39 #include <dns/rdataset.h>
  40 #include <dns/rdatastruct.h>
  41 #include <dns/result.h>
  42 #include <dns/tkey.h>
  43 #include <dns/tsig.h>
  44
  45 #include <dst/dst.h>
  46 #include <dst/gssapi.h>
  47
  48 #define TKEY_RANDOM_AMOUNT 16
  49
  50 #define RETERR(x) do { \
  51         result = (x); \
  52         if (result != ISC_R_SUCCESS) \
  53                 goto failure; \
  54         } while (0)
  55
  56 static void
  57 tkey_log(const char *fmt, ...) ISC_FORMAT_PRINTF(1, 2);
  58
  59 static void
  60 tkey_log(const char *fmt, ...) {
  61         va_list ap;
  62
  63         va_start(ap, fmt);
  64         isc_log_vwrite(dns_lctx, DNS_LOGCATEGORY_GENERAL,
  65                        DNS_LOGMODULE_REQUEST, ISC_LOG_DEBUG(4), fmt, ap);
  66         va_end(ap);
  67 }
  68
  69 static void
  70 _dns_tkey_dumpmessage(dns_message_t *msg) {
  71         isc_buffer_t outbuf;
  72         unsigned char output[4096];
  73         isc_result_t result;
  74
  75         isc_buffer_init(&outbuf, output, sizeof(output));
  76         result = dns_message_totext(msg, &dns_master_style_debug, 0,
  77                                     &outbuf);
  78         /* XXXMLG ignore result */
  79         fprintf(stderr, "%.*s\n", (int)isc_buffer_usedlength(&outbuf),
  80                 (char *)isc_buffer_base(&outbuf));
  81 }
  82
  83 isc_result_t
  84 dns_tkeyctx_create(isc_mem_t *mctx, isc_entropy_t *ectx, dns_tkeyctx_t **tctxp)
  85 {
  86         dns_tkeyctx_t *tctx;
  87
  88         REQUIRE(mctx != NULL);
  89         REQUIRE(ectx != NULL);
  90         REQUIRE(tctxp != NULL && *tctxp == NULL);
  91
  92         tctx = isc_mem_get(mctx, sizeof(dns_tkeyctx_t));
  93         if (tctx == NULL)
  94                 return (ISC_R_NOMEMORY);
  95         tctx->mctx = NULL;
  96         isc_mem_attach(mctx, &tctx->mctx);
  97         tctx->ectx = NULL;
  98         isc_entropy_attach(ectx, &tctx->ectx);
  99         tctx->dhkey = NULL;
 100         tctx->domain = NULL;
 101         tctx->gsscred = NULL;
 102
 103         *tctxp = tctx;
 104         return (ISC_R_SUCCESS);
 105 }
 106
 107 void
 108 dns_tkeyctx_destroy(dns_tkeyctx_t **tctxp) {
 109         isc_mem_t *mctx;
 110         dns_tkeyctx_t *tctx;
 111
 112         REQUIRE(tctxp != NULL && *tctxp != NULL);
 113
 114         tctx = *tctxp;
 115         mctx = tctx->mctx;
 116
 117         if (tctx->dhkey != NULL)
 118                 dst_key_free(&tctx->dhkey);
 119         if (tctx->domain != NULL) {
 120                 if (dns_name_dynamic(tctx->domain))
 121                         dns_name_free(tctx->domain, mctx);
 122                 isc_mem_put(mctx, tctx->domain, sizeof(dns_name_t));
 123         }
 124         if (tctx->gsscred != NULL)
 125                 dst_gssapi_releasecred(&tctx->gsscred);
 126         isc_entropy_detach(&tctx->ectx);
 127         isc_mem_put(mctx, tctx, sizeof(dns_tkeyctx_t));
 128         isc_mem_detach(&mctx);
 129         *tctxp = NULL;
 130 }
 131
 132 static isc_result_t
 133 add_rdata_to_list(dns_message_t *msg, dns_name_t *name, dns_rdata_t *rdata,
 134                 isc_uint32_t ttl, dns_namelist_t *namelist)
 135 {
 136         isc_result_t result;
 137         isc_region_t r, newr;
 138         dns_rdata_t *newrdata = NULL;
 139         dns_name_t *newname = NULL;
 140         dns_rdatalist_t *newlist = NULL;
 141         dns_rdataset_t *newset = NULL;
 142         isc_buffer_t *tmprdatabuf = NULL;
 143
 144         RETERR(dns_message_gettemprdata(msg, &newrdata));
 145
 146         dns_rdata_toregion(rdata, &r);
 147         RETERR(isc_buffer_allocate(msg->mctx, &tmprdatabuf, r.length));
 148         isc_buffer_availableregion(tmprdatabuf, &newr);
 149         memcpy(newr.base, r.base, r.length);
 150         dns_rdata_fromregion(newrdata, rdata->rdclass, rdata->type, &newr);
 151         dns_message_takebuffer(msg, &tmprdatabuf);
 152
 153         RETERR(dns_message_gettempname(msg, &newname));
 154         dns_name_init(newname, NULL);
 155         RETERR(dns_name_dup(name, msg->mctx, newname));
 156
 157         RETERR(dns_message_gettemprdatalist(msg, &newlist));
 158         newlist->rdclass = newrdata->rdclass;
 159         newlist->type = newrdata->type;
 160         newlist->covers = 0;
 161         newlist->ttl = ttl;
 162         ISC_LIST_INIT(newlist->rdata);
 163         ISC_LIST_APPEND(newlist->rdata, newrdata, link);
 164
 165         RETERR(dns_message_gettemprdataset(msg, &newset));
 166         dns_rdataset_init(newset);
 167         RETERR(dns_rdatalist_tordataset(newlist, newset));
 168
 169         ISC_LIST_INIT(newname->list);
 170         ISC_LIST_APPEND(newname->list, newset, link);
 171
 172         ISC_LIST_APPEND(*namelist, newname, link);
 173
 174         return (ISC_R_SUCCESS);
 175
 176  failure:
 177         if (newrdata != NULL) {
 178                 if (ISC_LINK_LINKED(newrdata, link))
 179                         ISC_LIST_UNLINK(newlist->rdata, newrdata, link);
 180                 dns_message_puttemprdata(msg, &newrdata);
 181         }
 182         if (newname != NULL)
 183                 dns_message_puttempname(msg, &newname);
 184         if (newset != NULL) {
 185                 dns_rdataset_disassociate(newset);
 186                 dns_message_puttemprdataset(msg, &newset);
 187         }
 188         if (newlist != NULL)
 189                 dns_message_puttemprdatalist(msg, &newlist);
 190         return (result);
 191 }
 192
 193 static void
 194 free_namelist(dns_message_t *msg, dns_namelist_t *namelist) {
 195         dns_name_t *name;
 196         dns_rdataset_t *set;
 197
 198         while (!ISC_LIST_EMPTY(*namelist)) {
 199                 name = ISC_LIST_HEAD(*namelist);
 200                 ISC_LIST_UNLINK(*namelist, name, link);
 201                 while (!ISC_LIST_EMPTY(name->list)) {
 202                         set = ISC_LIST_HEAD(name->list);
 203                         ISC_LIST_UNLINK(name->list, set, link);
 204                         dns_message_puttemprdataset(msg, &set);
 205                 }
 206                 dns_message_puttempname(msg, &name);
 207         }
 208 }
 209
 210 static isc_result_t
 211 compute_secret(isc_buffer_t *shared, isc_region_t *queryrandomness,
 212                isc_region_t *serverrandomness, isc_buffer_t *secret)
 213 {
 214         isc_md5_t md5ctx;
 215         isc_region_t r, r2;
 216         unsigned char digests[32];
 217         unsigned int i;
 218
 219         isc_buffer_usedregion(shared, &r);
 220
 221         /*
 222          * MD5 ( query data | DH value ).
 223          */
 224         isc_md5_init(&md5ctx);
 225         isc_md5_update(&md5ctx, queryrandomness->base,
 226                        queryrandomness->length);
 227         isc_md5_update(&md5ctx, r.base, r.length);
 228         isc_md5_final(&md5ctx, digests);
 229
 230         /*
 231          * MD5 ( server data | DH value ).
 232          */
 233         isc_md5_init(&md5ctx);
 234         isc_md5_update(&md5ctx, serverrandomness->base,
 235                        serverrandomness->length);
 236         isc_md5_update(&md5ctx, r.base, r.length);
 237         isc_md5_final(&md5ctx, &digests[ISC_MD5_DIGESTLENGTH]);
 238
 239         /*
 240          * XOR ( DH value, MD5-1 | MD5-2).
 241          */
 242         isc_buffer_availableregion(secret, &r);
 243         isc_buffer_usedregion(shared, &r2);
 244         if (r.length < sizeof(digests) || r.length < r2.length)
 245                 return (ISC_R_NOSPACE);
 246         if (r2.length > sizeof(digests)) {
 247                 memcpy(r.base, r2.base, r2.length);
 248                 for (i = 0; i < sizeof(digests); i++)
 249                         r.base[i] ^= digests[i];
 250                 isc_buffer_add(secret, r2.length);
 251         } else {
 252                 memcpy(r.base, digests, sizeof(digests));
 253                 for (i = 0; i < r2.length; i++)
 254                         r.base[i] ^= r2.base[i];
 255                 isc_buffer_add(secret, sizeof(digests));
 256         }
 257         return (ISC_R_SUCCESS);
 258
 259 }
 260
 261 static isc_result_t
 262 process_dhtkey(dns_message_t *msg, dns_name_t *signer, dns_name_t *name,
 263                dns_rdata_tkey_t *tkeyin, dns_tkeyctx_t *tctx,
 264                dns_rdata_tkey_t *tkeyout,
 265                dns_tsig_keyring_t *ring, dns_namelist_t *namelist)
 266 {
 267         isc_result_t result = ISC_R_SUCCESS;
 268         dns_name_t *keyname, ourname;
 269         dns_rdataset_t *keyset = NULL;
 270         dns_rdata_t keyrdata = DNS_RDATA_INIT, ourkeyrdata = DNS_RDATA_INIT;
 271         isc_boolean_t found_key = ISC_FALSE, found_incompatible = ISC_FALSE;
 272         dst_key_t *pubkey = NULL;
 273         isc_buffer_t ourkeybuf, *shared = NULL;
 274         isc_region_t r, r2, ourkeyr;
 275         unsigned char keydata[DST_KEY_MAXSIZE];
 276         unsigned int sharedsize;
 277         isc_buffer_t secret;
 278         unsigned char *randomdata = NULL, secretdata[256];
 279         dns_ttl_t ttl = 0;
 280
 281         if (tctx->dhkey == NULL) {
 282                 tkey_log("process_dhtkey: tkey-dhkey not defined");
 283                 tkeyout->error = dns_tsigerror_badalg;
 284                 return (DNS_R_REFUSED);
 285         }
 286
 287         if (!dns_name_equal(&tkeyin->algorithm, DNS_TSIG_HMACMD5_NAME)) {
 288                 tkey_log("process_dhtkey: algorithms other than "
 289                          "hmac-md5 are not supported");
 290                 tkeyout->error = dns_tsigerror_badalg;
 291                 return (ISC_R_SUCCESS);
 292         }
 293
 294         /*
 295          * Look for a DH KEY record that will work with ours.
 296          */
 297         for (result = dns_message_firstname(msg, DNS_SECTION_ADDITIONAL);
 298              result == ISC_R_SUCCESS && !found_key;
 299              result = dns_message_nextname(msg, DNS_SECTION_ADDITIONAL)) {
 300                 keyname = NULL;
 301                 dns_message_currentname(msg, DNS_SECTION_ADDITIONAL, &keyname);
 302                 keyset = NULL;
 303                 result = dns_message_findtype(keyname, dns_rdatatype_key, 0,
 304                                               &keyset);
 305                 if (result != ISC_R_SUCCESS)
 306                         continue;
 307
 308                 for (result = dns_rdataset_first(keyset);
 309                      result == ISC_R_SUCCESS && !found_key;
 310                      result = dns_rdataset_next(keyset)) {
 311                         dns_rdataset_current(keyset, &keyrdata);
 312                         pubkey = NULL;
 313                         result = dns_dnssec_keyfromrdata(keyname, &keyrdata,
 314                                                          msg->mctx, &pubkey);
 315                         if (result != ISC_R_SUCCESS) {
 316                                 dns_rdata_reset(&keyrdata);
 317                                 continue;
 318                         }
 319                         if (dst_key_alg(pubkey) == DNS_KEYALG_DH) {
 320                                 if (dst_key_paramcompare(pubkey, tctx->dhkey))
 321                                 {
 322                                         found_key = ISC_TRUE;
 323                                         ttl = keyset->ttl;
 324                                         break;
 325                                 } else
 326                                         found_incompatible = ISC_TRUE;
 327                         }
 328                         dst_key_free(&pubkey);
 329                         dns_rdata_reset(&keyrdata);
 330                 }
 331         }
 332
 333         if (!found_key) {
 334                 if (found_incompatible) {
 335                         tkey_log("process_dhtkey: found an incompatible key");
 336                         tkeyout->error = dns_tsigerror_badkey;
 337                         return (ISC_R_SUCCESS);
 338                 } else {
 339                         tkey_log("process_dhtkey: failed to find a key");
 340                         return (DNS_R_FORMERR);
 341                 }
 342         }
 343
 344         RETERR(add_rdata_to_list(msg, keyname, &keyrdata, ttl, namelist));
 345
 346         isc_buffer_init(&ourkeybuf, keydata, sizeof(keydata));
 347         RETERR(dst_key_todns(tctx->dhkey, &ourkeybuf));
 348         isc_buffer_usedregion(&ourkeybuf, &ourkeyr);
 349         dns_rdata_fromregion(&ourkeyrdata, dns_rdataclass_any,
 350                              dns_rdatatype_key, &ourkeyr);
 351
 352         dns_name_init(&ourname, NULL);
 353         dns_name_clone(dst_key_name(tctx->dhkey), &ourname);
 354
 355         /*
 356          * XXXBEW The TTL should be obtained from the database, if it exists.
 357          */
 358         RETERR(add_rdata_to_list(msg, &ourname, &ourkeyrdata, 0, namelist));
 359
 360         RETERR(dst_key_secretsize(tctx->dhkey, &sharedsize));
 361         RETERR(isc_buffer_allocate(msg->mctx, &shared, sharedsize));
 362
 363         result = dst_key_computesecret(pubkey, tctx->dhkey, shared);
 364         if (result != ISC_R_SUCCESS) {
 365                 tkey_log("process_dhtkey: failed to compute shared secret: %s",
 366                          isc_result_totext(result));
 367                 goto failure;
 368         }
 369         dst_key_free(&pubkey);
 370
 371         isc_buffer_init(&secret, secretdata, sizeof(secretdata));
 372
 373         randomdata = isc_mem_get(tkeyout->mctx, TKEY_RANDOM_AMOUNT);
 374         if (randomdata == NULL)
 375                 goto failure;
 376
 377         result = isc_entropy_getdata(tctx->ectx, randomdata,
 378                                      TKEY_RANDOM_AMOUNT, NULL, 0);
 379         if (result != ISC_R_SUCCESS) {
 380                 tkey_log("process_dhtkey: failed to obtain entropy: %s",
 381                          isc_result_totext(result));
 382                 goto failure;
 383         }
 384
 385         r.base = randomdata;
 386         r.length = TKEY_RANDOM_AMOUNT;
 387         r2.base = tkeyin->key;
 388         r2.length = tkeyin->keylen;
 389         RETERR(compute_secret(shared, &r2, &r, &secret));
 390         isc_buffer_free(&shared);
 391
 392         RETERR(dns_tsigkey_create(name, &tkeyin->algorithm,
 393                                   isc_buffer_base(&secret),
 394                                   isc_buffer_usedlength(&secret),
 395                                   ISC_TRUE, signer, tkeyin->inception,
 396                                   tkeyin->expire, ring->mctx, ring, NULL));
 397
 398         /* This key is good for a long time */
 399         tkeyout->inception = tkeyin->inception;
 400         tkeyout->expire = tkeyin->expire;
 401
 402         tkeyout->key = randomdata;
 403         tkeyout->keylen = TKEY_RANDOM_AMOUNT;
 404
 405         return (ISC_R_SUCCESS);
 406
 407  failure:
 408         if (!ISC_LIST_EMPTY(*namelist))
 409                 free_namelist(msg, namelist);
 410         if (shared != NULL)
 411                 isc_buffer_free(&shared);
 412         if (pubkey != NULL)
 413                 dst_key_free(&pubkey);
 414         if (randomdata != NULL)
 415                 isc_mem_put(tkeyout->mctx, randomdata, TKEY_RANDOM_AMOUNT);
 416         return (result);
 417 }
 418
 419 static isc_result_t
 420 process_gsstkey(dns_message_t *msg, dns_name_t *signer, dns_name_t *name,
 421                 dns_rdata_tkey_t *tkeyin, dns_tkeyctx_t *tctx,
 422                 dns_rdata_tkey_t *tkeyout,
 423                 dns_tsig_keyring_t *ring, dns_namelist_t *namelist)
 424 {
 425         isc_result_t result = ISC_R_SUCCESS;
 426         dst_key_t *dstkey = NULL;
 427         dns_tsigkey_t *tsigkey = NULL;
 428         dns_fixedname_t principal;
 429         isc_stdtime_t now;
 430         isc_region_t intoken;
 431         isc_buffer_t *outtoken = NULL;
 432         gss_ctx_id_t gss_ctx = NULL;
 433
 434         UNUSED(namelist);
 435         UNUSED(signer);
 436
 437         if (tctx->gsscred == NULL)
 438                 return (ISC_R_NOPERM);
 439
 440         if (!dns_name_equal(&tkeyin->algorithm, DNS_TSIG_GSSAPI_NAME) &&
 441             !dns_name_equal(&tkeyin->algorithm, DNS_TSIG_GSSAPIMS_NAME)) {
 442                 tkeyout->error = dns_tsigerror_badalg;
 443                 tkey_log("process_gsstkey(): dns_tsigerror_badalg");    /* XXXSRA */
 444                 return (ISC_R_SUCCESS);
 445         }
 446
 447         /*
 448          * XXXDCL need to check for key expiry per 4.1.1
 449          * XXXDCL need a way to check fully established, perhaps w/key_flags
 450          */
 451
 452         intoken.base = tkeyin->key;
 453         intoken.length = tkeyin->keylen;
 454
 455         result = dns_tsigkey_find(&tsigkey, name, &tkeyin->algorithm, ring);
 456         if (result == ISC_R_SUCCESS)
 457                 gss_ctx = dst_key_getgssctx(tsigkey->key);
 458
 459
 460         dns_fixedname_init(&principal);
 461
 462         result = dst_gssapi_acceptctx(tctx->gsscred, &intoken,
 463                                       &outtoken, &gss_ctx,
 464                                       dns_fixedname_name(&principal),
 465                                       tctx->mctx);
 466
 467         if (tsigkey != NULL)
 468                 dns_tsigkey_detach(&tsigkey);
 469
 470         if (result == DNS_R_INVALIDTKEY) {
 471                 tkeyout->error = dns_tsigerror_badkey;
 472                 tkey_log("process_gsstkey(): dns_tsigerror_badkey");    /* XXXSRA */
 473                 return (ISC_R_SUCCESS);
 474         } else if (result == ISC_R_FAILURE)
 475                 goto failure;
 476         ENSURE(result == DNS_R_CONTINUE || result == ISC_R_SUCCESS);
 477         /*
 478          * XXXDCL Section 4.1.3: Limit GSS_S_CONTINUE_NEEDED to 10 times.
 479          */
 480
 481         if (tsigkey == NULL) {
 482                 RETERR(dst_key_fromgssapi(name, gss_ctx, msg->mctx, &dstkey));
 483                 RETERR(dns_tsigkey_createfromkey(name, &tkeyin->algorithm,
 484                                                  dstkey, ISC_TRUE,
 485                                                  dns_fixedname_name(&principal),
 486                                                  tkeyin->inception,
 487                                                  tkeyin->expire,
 488                                                  ring->mctx, ring, NULL));
 489         }
 490
 491         isc_stdtime_get(&now);
 492         tkeyout->inception = tkeyin->inception;
 493         tkeyout->expire = tkeyin->expire;
 494
 495         if (outtoken) {
 496                 tkeyout->key = isc_mem_get(tkeyout->mctx,
 497                                            isc_buffer_usedlength(outtoken));
 498                 if (tkeyout->key == NULL) {
 499                         result = ISC_R_NOMEMORY;
 500                         goto failure;
 501                 }
 502                 tkeyout->keylen = isc_buffer_usedlength(outtoken);
 503                 memcpy(tkeyout->key, isc_buffer_base(outtoken),
 504                        isc_buffer_usedlength(outtoken));
 505                 isc_buffer_free(&outtoken);
 506         } else {
 507                 tkeyout->key = isc_mem_get(tkeyout->mctx, tkeyin->keylen);
 508                 if (tkeyout->key == NULL) {
 509                         result = ISC_R_NOMEMORY;
 510                         goto failure;
 511                 }
 512                 tkeyout->keylen = tkeyin->keylen;
 513                 memcpy(tkeyout->key, tkeyin->key, tkeyin->keylen);
 514         }
 515
 516         tkeyout->error = dns_rcode_noerror;
 517
 518         tkey_log("process_gsstkey(): dns_tsigerror_noerror");   /* XXXSRA */
 519
 520         return (ISC_R_SUCCESS);
 521
 522 failure:
 523         if (dstkey != NULL)
 524                 dst_key_free(&dstkey);
 525
 526         if (outtoken != NULL)
 527                 isc_buffer_free(&outtoken);
 528
 529         tkey_log("process_gsstkey(): %s",
 530                 isc_result_totext(result));     /* XXXSRA */
 531
 532         return (result);
 533 }
 534
 535 static isc_result_t
 536 process_deletetkey(dns_message_t *msg, dns_name_t *signer, dns_name_t *name,
 537                    dns_rdata_tkey_t *tkeyin,
 538                    dns_rdata_tkey_t *tkeyout,
 539                    dns_tsig_keyring_t *ring,
 540                    dns_namelist_t *namelist)
 541 {
 542         isc_result_t result;
 543         dns_tsigkey_t *tsigkey = NULL;
 544         dns_name_t *identity;
 545
 546         UNUSED(msg);
 547         UNUSED(namelist);
 548
 549         result = dns_tsigkey_find(&tsigkey, name, &tkeyin->algorithm, ring);
 550         if (result != ISC_R_SUCCESS) {
 551                 tkeyout->error = dns_tsigerror_badname;
 552                 return (ISC_R_SUCCESS);
 553         }
 554
 555         /*
 556          * Only allow a delete if the identity that created the key is the
 557          * same as the identity that signed the message.
 558          */
 559         identity = dns_tsigkey_identity(tsigkey);
 560         if (identity == NULL || !dns_name_equal(identity, signer)) {
 561                 dns_tsigkey_detach(&tsigkey);
 562                 return (DNS_R_REFUSED);
 563         }
 564
 565         /*
 566          * Set the key to be deleted when no references are left.  If the key
 567          * was not generated with TKEY and is in the config file, it may be
 568          * reloaded later.
 569          */
 570         dns_tsigkey_setdeleted(tsigkey);
 571
 572         /* Release the reference */
 573         dns_tsigkey_detach(&tsigkey);
 574
 575         return (ISC_R_SUCCESS);
 576 }
 577
 578 isc_result_t
 579 dns_tkey_processquery(dns_message_t *msg, dns_tkeyctx_t *tctx,
 580                       dns_tsig_keyring_t *ring)
 581 {
 582         isc_result_t result = ISC_R_SUCCESS;
 583         dns_rdata_tkey_t tkeyin, tkeyout;
 584         isc_boolean_t freetkeyin = ISC_FALSE;
 585         dns_name_t *qname, *name, *keyname, *signer, tsigner;
 586         dns_fixedname_t fkeyname;
 587         dns_rdataset_t *tkeyset;
 588         dns_rdata_t rdata;
 589         dns_namelist_t namelist;
 590         char tkeyoutdata[512];
 591         isc_buffer_t tkeyoutbuf;
 592
 593         REQUIRE(msg != NULL);
 594         REQUIRE(tctx != NULL);
 595         REQUIRE(ring != NULL);
 596
 597         ISC_LIST_INIT(namelist);
 598
 599         /*
 600          * Interpret the question section.
 601          */
 602         result = dns_message_firstname(msg, DNS_SECTION_QUESTION);
 603         if (result != ISC_R_SUCCESS)
 604                 return (DNS_R_FORMERR);
 605
 606         qname = NULL;
 607         dns_message_currentname(msg, DNS_SECTION_QUESTION, &qname);
 608
 609         /*
 610          * Look for a TKEY record that matches the question.
 611          */
 612         tkeyset = NULL;
 613         name = NULL;
 614         result = dns_message_findname(msg, DNS_SECTION_ADDITIONAL, qname,
 615                                       dns_rdatatype_tkey, 0, &name, &tkeyset);
 616         if (result != ISC_R_SUCCESS) {
 617                 /*
 618                  * Try the answer section, since that's where Win2000
 619                  * puts it.
 620                  */
 621                 if (dns_message_findname(msg, DNS_SECTION_ANSWER, qname,
 622                                          dns_rdatatype_tkey, 0, &name,
 623                                          &tkeyset) != ISC_R_SUCCESS) {
 624                         result = DNS_R_FORMERR;
 625                         tkey_log("dns_tkey_processquery: couldn't find a TKEY "
 626                                  "matching the question");
 627                         goto failure;
 628                 }
 629         }
 630         result = dns_rdataset_first(tkeyset);
 631         if (result != ISC_R_SUCCESS) {
 632                 result = DNS_R_FORMERR;
 633                 goto failure;
 634         }
 635         dns_rdata_init(&rdata);
 636         dns_rdataset_current(tkeyset, &rdata);
 637
 638         RETERR(dns_rdata_tostruct(&rdata, &tkeyin, NULL));
 639         freetkeyin = ISC_TRUE;
 640
 641         if (tkeyin.error != dns_rcode_noerror) {
 642                 result = DNS_R_FORMERR;
 643                 goto failure;
 644         }
 645
 646         /*
 647          * Before we go any farther, verify that the message was signed.
 648          * GSSAPI TKEY doesn't require a signature, the rest do.
 649          */
 650         dns_name_init(&tsigner, NULL);
 651         result = dns_message_signer(msg, &tsigner);
 652         if (result != ISC_R_SUCCESS) {
 653                 if (tkeyin.mode == DNS_TKEYMODE_GSSAPI &&
 654                     result == ISC_R_NOTFOUND)
 655                        signer = NULL;
 656                 else {
 657                         tkey_log("dns_tkey_processquery: query was not "
 658                                  "properly signed - rejecting");
 659                         result = DNS_R_FORMERR;
 660                         goto failure;
 661                 }
 662         } else
 663                 signer = &tsigner;
 664
 665         tkeyout.common.rdclass = tkeyin.common.rdclass;
 666         tkeyout.common.rdtype = tkeyin.common.rdtype;
 667         ISC_LINK_INIT(&tkeyout.common, link);
 668         tkeyout.mctx = msg->mctx;
 669
 670         dns_name_init(&tkeyout.algorithm, NULL);
 671         dns_name_clone(&tkeyin.algorithm, &tkeyout.algorithm);
 672
 673         tkeyout.inception = tkeyout.expire = 0;
 674         tkeyout.mode = tkeyin.mode;
 675         tkeyout.error = 0;
 676         tkeyout.keylen = tkeyout.otherlen = 0;
 677         tkeyout.key = tkeyout.other = NULL;
 678
 679         /*
 680          * A delete operation must have a fully specified key name.  If this
 681          * is not a delete, we do the following:
 682          * if (qname != ".")
 683          *      keyname = qname + defaultdomain
 684          * else
 685          *      keyname = <random hex> + defaultdomain
 686          */
 687         if (tkeyin.mode != DNS_TKEYMODE_DELETE) {
 688                 dns_tsigkey_t *tsigkey = NULL;
 689
 690                 if (tctx->domain == NULL && tkeyin.mode != DNS_TKEYMODE_GSSAPI) {
 691                         tkey_log("dns_tkey_processquery: tkey-domain not set");
 692                         result = DNS_R_REFUSED;
 693                         goto failure;
 694                 }
 695
 696                 dns_fixedname_init(&fkeyname);
 697                 keyname = dns_fixedname_name(&fkeyname);
 698
 699                 if (!dns_name_equal(qname, dns_rootname)) {
 700                         unsigned int n = dns_name_countlabels(qname);
 701                         RUNTIME_CHECK(dns_name_copy(qname, keyname, NULL)
 702                                       == ISC_R_SUCCESS);
 703                         dns_name_getlabelsequence(keyname, 0, n - 1, keyname);
 704                 } else {
 705                         static char hexdigits[16] = {
 706                                 '0', '1', '2', '3', '4', '5', '6', '7',
 707                                 '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
 708                         unsigned char randomdata[16];
 709                         char randomtext[32];
 710                         isc_buffer_t b;
 711                         unsigned int i, j;
 712
 713                         result = isc_entropy_getdata(tctx->ectx,
 714                                                      randomdata,
 715                                                      sizeof(randomdata),
 716                                                      NULL, 0);
 717                         if (result != ISC_R_SUCCESS)
 718                                 goto failure;
 719
 720                         for (i = 0, j = 0; i < sizeof(randomdata); i++) {
 721                                 unsigned char val = randomdata[i];
 722                                 randomtext[j++] = hexdigits[val >> 4];
 723                                 randomtext[j++] = hexdigits[val & 0xF];
 724                         }
 725                         isc_buffer_init(&b, randomtext, sizeof(randomtext));
 726                         isc_buffer_add(&b, sizeof(randomtext));
 727                         result = dns_name_fromtext(keyname, &b, NULL,
 728                                                    ISC_FALSE, NULL);
 729                         if (result != ISC_R_SUCCESS)
 730                                 goto failure;
 731                 }
 732
 733                 if (tkeyin.mode == DNS_TKEYMODE_GSSAPI) {
 734                         /* Yup.  This is a hack */
 735                         result = dns_name_concatenate(keyname, dns_rootname,
 736                                                       keyname, NULL);
 737                         if (result != ISC_R_SUCCESS)
 738                                 goto failure;
 739                 } else {
 740                         result = dns_name_concatenate(keyname, tctx->domain,
 741                                                       keyname, NULL);
 742                         if (result != ISC_R_SUCCESS)
 743                                 goto failure;
 744                 }
 745
 746                 result = dns_tsigkey_find(&tsigkey, keyname, NULL, ring);
 747
 748                 if (result == ISC_R_SUCCESS) {
 749                         tkeyout.error = dns_tsigerror_badname;
 750                         dns_tsigkey_detach(&tsigkey);
 751                         goto failure_with_tkey;
 752                 } else if (result != ISC_R_NOTFOUND)
 753                         goto failure;
 754         } else
 755                 keyname = qname;
 756
 757         switch (tkeyin.mode) {
 758                 case DNS_TKEYMODE_DIFFIEHELLMAN:
 759                         tkeyout.error = dns_rcode_noerror;
 760                         RETERR(process_dhtkey(msg, signer, keyname, &tkeyin,
 761                                               tctx, &tkeyout, ring,
 762                                               &namelist));
 763                         break;
 764                 case DNS_TKEYMODE_GSSAPI:
 765                         tkeyout.error = dns_rcode_noerror;
 766                         RETERR(process_gsstkey(msg, signer, keyname, &tkeyin,
 767                                                tctx, &tkeyout, ring,
 768                                                &namelist));
 769
 770                         break;
 771                 case DNS_TKEYMODE_DELETE:
 772                         tkeyout.error = dns_rcode_noerror;
 773                         RETERR(process_deletetkey(msg, signer, keyname,
 774                                                   &tkeyin, &tkeyout,
 775                                                   ring, &namelist));
 776                         break;
 777                 case DNS_TKEYMODE_SERVERASSIGNED:
 778                 case DNS_TKEYMODE_RESOLVERASSIGNED:
 779                         result = DNS_R_NOTIMP;
 780                         goto failure;
 781                 default:
 782                         tkeyout.error = dns_tsigerror_badmode;
 783         }
 784
 785  failure_with_tkey:
 786         dns_rdata_init(&rdata);
 787         isc_buffer_init(&tkeyoutbuf, tkeyoutdata, sizeof(tkeyoutdata));
 788         result = dns_rdata_fromstruct(&rdata, tkeyout.common.rdclass,
 789                                       tkeyout.common.rdtype, &tkeyout,
 790                                       &tkeyoutbuf);
 791
 792         if (freetkeyin) {
 793                 dns_rdata_freestruct(&tkeyin);
 794                 freetkeyin = ISC_FALSE;
 795         }
 796
 797         if (tkeyout.key != NULL)
 798                 isc_mem_put(tkeyout.mctx, tkeyout.key, tkeyout.keylen);
 799         if (tkeyout.other != NULL)
 800                 isc_mem_put(tkeyout.mctx, tkeyout.other, tkeyout.otherlen);
 801         if (result != ISC_R_SUCCESS)
 802                 goto failure;
 803
 804         RETERR(add_rdata_to_list(msg, keyname, &rdata, 0, &namelist));
 805
 806         RETERR(dns_message_reply(msg, ISC_TRUE));
 807
 808         name = ISC_LIST_HEAD(namelist);
 809         while (name != NULL) {
 810                 dns_name_t *next = ISC_LIST_NEXT(name, link);
 811                 ISC_LIST_UNLINK(namelist, name, link);
 812                 dns_message_addname(msg, name, DNS_SECTION_ANSWER);
 813                 name = next;
 814         }
 815
 816         return (ISC_R_SUCCESS);
 817
 818  failure:
 819         if (freetkeyin)
 820                 dns_rdata_freestruct(&tkeyin);
 821         if (!ISC_LIST_EMPTY(namelist))
 822                 free_namelist(msg, &namelist);
 823         return (result);
 824 }
 825
 826 static isc_result_t
 827 buildquery(dns_message_t *msg, dns_name_t *name,
 828            dns_rdata_tkey_t *tkey, isc_boolean_t win2k)
 829 {
 830         dns_name_t *qname = NULL, *aname = NULL;
 831         dns_rdataset_t *question = NULL, *tkeyset = NULL;
 832         dns_rdatalist_t *tkeylist = NULL;
 833         dns_rdata_t *rdata = NULL;
 834         isc_buffer_t *dynbuf = NULL;
 835         isc_result_t result;
 836
 837         REQUIRE(msg != NULL);
 838         REQUIRE(name != NULL);
 839         REQUIRE(tkey != NULL);
 840
 841         RETERR(dns_message_gettempname(msg, &qname));
 842         RETERR(dns_message_gettempname(msg, &aname));
 843
 844         RETERR(dns_message_gettemprdataset(msg, &question));
 845         dns_rdataset_init(question);
 846         dns_rdataset_makequestion(question, dns_rdataclass_any,
 847                                   dns_rdatatype_tkey);
 848
 849         RETERR(isc_buffer_allocate(msg->mctx, &dynbuf, 4096));
 850         RETERR(dns_message_gettemprdata(msg, &rdata));
 851
 852         RETERR(dns_rdata_fromstruct(rdata, dns_rdataclass_any,
 853                                     dns_rdatatype_tkey, tkey, dynbuf));
 854         dns_message_takebuffer(msg, &dynbuf);
 855
 856         RETERR(dns_message_gettemprdatalist(msg, &tkeylist));
 857         tkeylist->rdclass = dns_rdataclass_any;
 858         tkeylist->type = dns_rdatatype_tkey;
 859         tkeylist->covers = 0;
 860         tkeylist->ttl = 0;
 861         ISC_LIST_INIT(tkeylist->rdata);
 862         ISC_LIST_APPEND(tkeylist->rdata, rdata, link);
 863
 864         RETERR(dns_message_gettemprdataset(msg, &tkeyset));
 865         dns_rdataset_init(tkeyset);
 866         RETERR(dns_rdatalist_tordataset(tkeylist, tkeyset));
 867
 868         dns_name_init(qname, NULL);
 869         dns_name_clone(name, qname);
 870
 871         dns_name_init(aname, NULL);
 872         dns_name_clone(name, aname);
 873
 874         ISC_LIST_APPEND(qname->list, question, link);
 875         ISC_LIST_APPEND(aname->list, tkeyset, link);
 876
 877         dns_message_addname(msg, qname, DNS_SECTION_QUESTION);
 878
 879         /*
 880          * Windows 2000 needs this in the answer section, not the additional
 881          * section where the RFC specifies.
 882          */
 883         if (win2k)
 884                 dns_message_addname(msg, aname, DNS_SECTION_ANSWER);
 885         else
 886                 dns_message_addname(msg, aname, DNS_SECTION_ADDITIONAL);
 887
 888         return (ISC_R_SUCCESS);
 889
 890  failure:
 891         if (qname != NULL)
 892                 dns_message_puttempname(msg, &qname);
 893         if (aname != NULL)
 894                 dns_message_puttempname(msg, &aname);
 895         if (question != NULL) {
 896                 dns_rdataset_disassociate(question);
 897                 dns_message_puttemprdataset(msg, &question);
 898         }
 899         if (dynbuf != NULL)
 900                 isc_buffer_free(&dynbuf);
 901         printf("buildquery error\n");
 902         return (result);
 903 }
 904
 905 isc_result_t
 906 dns_tkey_builddhquery(dns_message_t *msg, dst_key_t *key, dns_name_t *name,
 907                       dns_name_t *algorithm, isc_buffer_t *nonce,
 908                       isc_uint32_t lifetime)
 909 {
 910         dns_rdata_tkey_t tkey;
 911         dns_rdata_t *rdata = NULL;
 912         isc_buffer_t *dynbuf = NULL;
 913         isc_region_t r;
 914         dns_name_t keyname;
 915         dns_namelist_t namelist;
 916         isc_result_t result;
 917         isc_stdtime_t now;
 918
 919         REQUIRE(msg != NULL);
 920         REQUIRE(key != NULL);
 921         REQUIRE(dst_key_alg(key) == DNS_KEYALG_DH);
 922         REQUIRE(dst_key_isprivate(key));
 923         REQUIRE(name != NULL);
 924         REQUIRE(algorithm != NULL);
 925
 926         tkey.common.rdclass = dns_rdataclass_any;
 927         tkey.common.rdtype = dns_rdatatype_tkey;
 928         ISC_LINK_INIT(&tkey.common, link);
 929         tkey.mctx = msg->mctx;
 930         dns_name_init(&tkey.algorithm, NULL);
 931         dns_name_clone(algorithm, &tkey.algorithm);
 932         isc_stdtime_get(&now);
 933         tkey.inception = now;
 934         tkey.expire = now + lifetime;
 935         tkey.mode = DNS_TKEYMODE_DIFFIEHELLMAN;
 936         if (nonce != NULL)
 937                 isc_buffer_usedregion(nonce, &r);
 938         else {
 939                 r.base = isc_mem_get(msg->mctx, 0);
 940                 r.length = 0;
 941         }
 942         tkey.error = 0;
 943         tkey.key = r.base;
 944         tkey.keylen =  r.length;
 945         tkey.other = NULL;
 946         tkey.otherlen = 0;
 947
 948         RETERR(buildquery(msg, name, &tkey, ISC_FALSE));
 949
 950         if (nonce == NULL)
 951                 isc_mem_put(msg->mctx, r.base, 0);
 952
 953         RETERR(dns_message_gettemprdata(msg, &rdata));
 954         RETERR(isc_buffer_allocate(msg->mctx, &dynbuf, 1024));
 955         RETERR(dst_key_todns(key, dynbuf));
 956         isc_buffer_usedregion(dynbuf, &r);
 957         dns_rdata_fromregion(rdata, dns_rdataclass_any,
 958                              dns_rdatatype_key, &r);
 959         dns_message_takebuffer(msg, &dynbuf);
 960
 961         dns_name_init(&keyname, NULL);
 962         dns_name_clone(dst_key_name(key), &keyname);
 963
 964         ISC_LIST_INIT(namelist);
 965         RETERR(add_rdata_to_list(msg, &keyname, rdata, 0, &namelist));
 966         dns_message_addname(msg, ISC_LIST_HEAD(namelist),
 967                             DNS_SECTION_ADDITIONAL);
 968
 969         return (ISC_R_SUCCESS);
 970
 971  failure:
 972
 973         if (dynbuf != NULL)
 974                 isc_buffer_free(&dynbuf);
 975         return (result);
 976 }
 977
 978 isc_result_t
 979 dns_tkey_buildgssquery(dns_message_t *msg, dns_name_t *name, dns_name_t *gname,
 980                        isc_buffer_t *intoken, isc_uint32_t lifetime,
 981                        gss_ctx_id_t *context, isc_boolean_t win2k)
 982 {
 983         dns_rdata_tkey_t tkey;
 984         isc_result_t result;
 985         isc_stdtime_t now;
 986         isc_buffer_t token;
 987         unsigned char array[4096];
 988
 989         UNUSED(intoken);
 990
 991         REQUIRE(msg != NULL);
 992         REQUIRE(name != NULL);
 993         REQUIRE(gname != NULL);
 994         REQUIRE(context != NULL);
 995
 996         isc_buffer_init(&token, array, sizeof(array));
 997         result = dst_gssapi_initctx(gname, NULL, &token, context);
 998         if (result != DNS_R_CONTINUE && result != ISC_R_SUCCESS)
 999                 return (result);
1000
1001         tkey.common.rdclass = dns_rdataclass_any;
1002         tkey.common.rdtype = dns_rdatatype_tkey;
1003         ISC_LINK_INIT(&tkey.common, link);
1004         tkey.mctx = NULL;
1005         dns_name_init(&tkey.algorithm, NULL);
1006
1007         if (win2k)
1008                 dns_name_clone(DNS_TSIG_GSSAPIMS_NAME, &tkey.algorithm);
1009         else
1010                 dns_name_clone(DNS_TSIG_GSSAPI_NAME, &tkey.algorithm);
1011
1012         isc_stdtime_get(&now);
1013         tkey.inception = now;
1014         tkey.expire = now + lifetime;
1015         tkey.mode = DNS_TKEYMODE_GSSAPI;
1016         tkey.error = 0;
1017         tkey.key = isc_buffer_base(&token);
1018         tkey.keylen = isc_buffer_usedlength(&token);
1019         tkey.other = NULL;
1020         tkey.otherlen = 0;
1021
1022         RETERR(buildquery(msg, name, &tkey, win2k));
1023
1024         return (ISC_R_SUCCESS);
1025
1026  failure:
1027         return (result);
1028 }
1029
1030 isc_result_t
1031 dns_tkey_builddeletequery(dns_message_t *msg, dns_tsigkey_t *key) {
1032         dns_rdata_tkey_t tkey;
1033
1034         REQUIRE(msg != NULL);
1035         REQUIRE(key != NULL);
1036
1037         tkey.common.rdclass = dns_rdataclass_any;
1038         tkey.common.rdtype = dns_rdatatype_tkey;
1039         ISC_LINK_INIT(&tkey.common, link);
1040         tkey.mctx = msg->mctx;
1041         dns_name_init(&tkey.algorithm, NULL);
1042         dns_name_clone(key->algorithm, &tkey.algorithm);
1043         tkey.inception = tkey.expire = 0;
1044         tkey.mode = DNS_TKEYMODE_DELETE;
1045         tkey.error = 0;
1046         tkey.keylen = tkey.otherlen = 0;
1047         tkey.key = tkey.other = NULL;
1048
1049         return (buildquery(msg, &key->name, &tkey, ISC_FALSE));
1050 }
1051
1052 static isc_result_t
1053 find_tkey(dns_message_t *msg, dns_name_t **name, dns_rdata_t *rdata,
1054           int section)
1055 {
1056         dns_rdataset_t *tkeyset;
1057         isc_result_t result;
1058
1059         result = dns_message_firstname(msg, section);
1060         while (result == ISC_R_SUCCESS) {
1061                 *name = NULL;
1062                 dns_message_currentname(msg, section, name);
1063                 tkeyset = NULL;
1064                 result = dns_message_findtype(*name, dns_rdatatype_tkey, 0,
1065                                               &tkeyset);
1066                 if (result == ISC_R_SUCCESS) {
1067                         result = dns_rdataset_first(tkeyset);
1068                         if (result != ISC_R_SUCCESS)
1069                                 return (result);
1070                         dns_rdataset_current(tkeyset, rdata);
1071                         return (ISC_R_SUCCESS);
1072                 }
1073                 result = dns_message_nextname(msg, section);
1074         }
1075         if (result == ISC_R_NOMORE)
1076                 return (ISC_R_NOTFOUND);
1077         return (result);
1078 }
1079
1080 isc_result_t
1081 dns_tkey_processdhresponse(dns_message_t *qmsg, dns_message_t *rmsg,
1082                            dst_key_t *key, isc_buffer_t *nonce,
1083                            dns_tsigkey_t **outkey, dns_tsig_keyring_t *ring)
1084 {
1085         dns_rdata_t qtkeyrdata = DNS_RDATA_INIT, rtkeyrdata = DNS_RDATA_INIT;
1086         dns_name_t keyname, *tkeyname, *theirkeyname, *ourkeyname, *tempname;
1087         dns_rdataset_t *theirkeyset = NULL, *ourkeyset = NULL;
1088         dns_rdata_t theirkeyrdata = DNS_RDATA_INIT;
1089         dst_key_t *theirkey = NULL;
1090         dns_rdata_tkey_t qtkey, rtkey;
1091         unsigned char secretdata[256];
1092         unsigned int sharedsize;
1093         isc_buffer_t *shared = NULL, secret;
1094         isc_region_t r, r2;
1095         isc_result_t result;
1096         isc_boolean_t freertkey = ISC_FALSE;
1097
1098         REQUIRE(qmsg != NULL);
1099         REQUIRE(rmsg != NULL);
1100         REQUIRE(key != NULL);
1101         REQUIRE(dst_key_alg(key) == DNS_KEYALG_DH);
1102         REQUIRE(dst_key_isprivate(key));
1103         if (outkey != NULL)
1104                 REQUIRE(*outkey == NULL);
1105
1106         if (rmsg->rcode != dns_rcode_noerror)
1107                 return (ISC_RESULTCLASS_DNSRCODE + rmsg->rcode);
1108         RETERR(find_tkey(rmsg, &tkeyname, &rtkeyrdata, DNS_SECTION_ANSWER));
1109         RETERR(dns_rdata_tostruct(&rtkeyrdata, &rtkey, NULL));
1110         freertkey = ISC_TRUE;
1111
1112         RETERR(find_tkey(qmsg, &tempname, &qtkeyrdata,
1113                          DNS_SECTION_ADDITIONAL));
1114         RETERR(dns_rdata_tostruct(&qtkeyrdata, &qtkey, NULL));
1115
1116         if (rtkey.error != dns_rcode_noerror ||
1117             rtkey.mode != DNS_TKEYMODE_DIFFIEHELLMAN ||
1118             rtkey.mode != qtkey.mode ||
1119             !dns_name_equal(&rtkey.algorithm, &qtkey.algorithm) ||
1120             rmsg->rcode != dns_rcode_noerror) {
1121                 tkey_log("dns_tkey_processdhresponse: tkey mode invalid "
1122                          "or error set(1)");
1123                 result = DNS_R_INVALIDTKEY;
1124                 dns_rdata_freestruct(&qtkey);
1125                 goto failure;
1126         }
1127
1128         dns_rdata_freestruct(&qtkey);
1129
1130         dns_name_init(&keyname, NULL);
1131         dns_name_clone(dst_key_name(key), &keyname);
1132
1133         ourkeyname = NULL;
1134         ourkeyset = NULL;
1135         RETERR(dns_message_findname(rmsg, DNS_SECTION_ANSWER, &keyname,
1136                                     dns_rdatatype_key, 0, &ourkeyname,
1137                                     &ourkeyset));
1138
1139         result = dns_message_firstname(rmsg, DNS_SECTION_ANSWER);
1140         while (result == ISC_R_SUCCESS) {
1141                 theirkeyname = NULL;
1142                 dns_message_currentname(rmsg, DNS_SECTION_ANSWER,
1143                                         &theirkeyname);
1144                 if (dns_name_equal(theirkeyname, ourkeyname))
1145                         goto next;
1146                 theirkeyset = NULL;
1147                 result = dns_message_findtype(theirkeyname, dns_rdatatype_key,
1148                                               0, &theirkeyset);
1149                 if (result == ISC_R_SUCCESS) {
1150                         RETERR(dns_rdataset_first(theirkeyset));
1151                         break;
1152                 }
1153  next:
1154                 result = dns_message_nextname(rmsg, DNS_SECTION_ANSWER);
1155         }
1156
1157         if (theirkeyset == NULL) {
1158                 tkey_log("dns_tkey_processdhresponse: failed to find server "
1159                          "key");
1160                 result = ISC_R_NOTFOUND;
1161                 goto failure;
1162         }
1163
1164         dns_rdataset_current(theirkeyset, &theirkeyrdata);
1165         RETERR(dns_dnssec_keyfromrdata(theirkeyname, &theirkeyrdata,
1166                                        rmsg->mctx, &theirkey));
1167
1168         RETERR(dst_key_secretsize(key, &sharedsize));
1169         RETERR(isc_buffer_allocate(rmsg->mctx, &shared, sharedsize));
1170
1171         RETERR(dst_key_computesecret(theirkey, key, shared));
1172
1173         isc_buffer_init(&secret, secretdata, sizeof(secretdata));
1174
1175         r.base = rtkey.key;
1176         r.length = rtkey.keylen;
1177         if (nonce != NULL)
1178                 isc_buffer_usedregion(nonce, &r2);
1179         else {
1180                 r2.base = isc_mem_get(rmsg->mctx, 0);
1181                 r2.length = 0;
1182         }
1183         RETERR(compute_secret(shared, &r2, &r, &secret));
1184         if (nonce == NULL)
1185                 isc_mem_put(rmsg->mctx, r2.base, 0);
1186
1187         isc_buffer_usedregion(&secret, &r);
1188         result = dns_tsigkey_create(tkeyname, &rtkey.algorithm,
1189                                     r.base, r.length, ISC_TRUE,
1190                                     NULL, rtkey.inception, rtkey.expire,
1191                                     rmsg->mctx, ring, outkey);
1192         isc_buffer_free(&shared);
1193         dns_rdata_freestruct(&rtkey);
1194         dst_key_free(&theirkey);
1195         return (result);
1196
1197  failure:
1198         if (shared != NULL)
1199                 isc_buffer_free(&shared);
1200
1201         if (theirkey != NULL)
1202                 dst_key_free(&theirkey);
1203
1204         if (freertkey)
1205                 dns_rdata_freestruct(&rtkey);
1206
1207         return (result);
1208 }
1209
1210 isc_result_t
1211 dns_tkey_processgssresponse(dns_message_t *qmsg, dns_message_t *rmsg,
1212                             dns_name_t *gname, gss_ctx_id_t *context,
1213                             isc_buffer_t *outtoken, dns_tsigkey_t **outkey,
1214                             dns_tsig_keyring_t *ring)
1215 {
1216         dns_rdata_t rtkeyrdata = DNS_RDATA_INIT, qtkeyrdata = DNS_RDATA_INIT;
1217         dns_name_t *tkeyname;
1218         dns_rdata_tkey_t rtkey, qtkey;
1219         dst_key_t *dstkey = NULL;
1220         isc_buffer_t intoken;
1221         isc_result_t result;
1222         unsigned char array[1024];
1223
1224         REQUIRE(outtoken != NULL);
1225         REQUIRE(qmsg != NULL);
1226         REQUIRE(rmsg != NULL);
1227         REQUIRE(gname != NULL);
1228         if (outkey != NULL)
1229                 REQUIRE(*outkey == NULL);
1230
1231         if (rmsg->rcode != dns_rcode_noerror)
1232                 return (ISC_RESULTCLASS_DNSRCODE + rmsg->rcode);
1233         RETERR(find_tkey(rmsg, &tkeyname, &rtkeyrdata, DNS_SECTION_ANSWER));
1234         RETERR(dns_rdata_tostruct(&rtkeyrdata, &rtkey, NULL));
1235
1236         /*
1237          * Win2k puts the item in the ANSWER section, while the RFC
1238          * specifies it should be in the ADDITIONAL section.  Check first
1239          * where it should be, and then where it may be.
1240          */
1241         result = find_tkey(qmsg, &tkeyname, &qtkeyrdata,
1242                            DNS_SECTION_ADDITIONAL);
1243         if (result == ISC_R_NOTFOUND)
1244                 result = find_tkey(qmsg, &tkeyname, &qtkeyrdata,
1245                                    DNS_SECTION_ANSWER);
1246         if (result != ISC_R_SUCCESS)
1247                 goto failure;
1248
1249         RETERR(dns_rdata_tostruct(&qtkeyrdata, &qtkey, NULL));
1250
1251         if (rtkey.error != dns_rcode_noerror ||
1252             rtkey.mode != DNS_TKEYMODE_GSSAPI ||
1253             !dns_name_equal(&rtkey.algorithm, &qtkey.algorithm)) {
1254                 tkey_log("dns_tkey_processgssresponse: tkey mode invalid "
1255                          "or error set(2) %d", rtkey.error);
1256                 _dns_tkey_dumpmessage(qmsg);
1257                 _dns_tkey_dumpmessage(rmsg);
1258                 result = DNS_R_INVALIDTKEY;
1259                 goto failure;
1260         }
1261
1262         isc_buffer_init(outtoken, array, sizeof(array));
1263         isc_buffer_init(&intoken, rtkey.key, rtkey.keylen);
1264         RETERR(dst_gssapi_initctx(gname, &intoken, outtoken, context));
1265
1266         dstkey = NULL;
1267         RETERR(dst_key_fromgssapi(dns_rootname, *context, rmsg->mctx,
1268                                   &dstkey));
1269
1270         RETERR(dns_tsigkey_createfromkey(tkeyname, DNS_TSIG_GSSAPI_NAME,
1271                                          dstkey, ISC_FALSE, NULL,
1272                                          rtkey.inception, rtkey.expire,
1273                                          ring->mctx, ring, outkey));
1274
1275         dns_rdata_freestruct(&rtkey);
1276         return (result);
1277
1278  failure:
1279         /*
1280          * XXXSRA This probably leaks memory from rtkey and qtkey.
1281          */
1282         return (result);
1283 }
1284
1285 isc_result_t
1286 dns_tkey_processdeleteresponse(dns_message_t *qmsg, dns_message_t *rmsg,
1287                                dns_tsig_keyring_t *ring)
1288 {
1289         dns_rdata_t qtkeyrdata = DNS_RDATA_INIT, rtkeyrdata = DNS_RDATA_INIT;
1290         dns_name_t *tkeyname, *tempname;
1291         dns_rdata_tkey_t qtkey, rtkey;
1292         dns_tsigkey_t *tsigkey = NULL;
1293         isc_result_t result;
1294
1295         REQUIRE(qmsg != NULL);
1296         REQUIRE(rmsg != NULL);
1297
1298         if (rmsg->rcode != dns_rcode_noerror)
1299                 return(ISC_RESULTCLASS_DNSRCODE + rmsg->rcode);
1300
1301         RETERR(find_tkey(rmsg, &tkeyname, &rtkeyrdata, DNS_SECTION_ANSWER));
1302         RETERR(dns_rdata_tostruct(&rtkeyrdata, &rtkey, NULL));
1303
1304         RETERR(find_tkey(qmsg, &tempname, &qtkeyrdata,
1305                          DNS_SECTION_ADDITIONAL));
1306         RETERR(dns_rdata_tostruct(&qtkeyrdata, &qtkey, NULL));
1307
1308         if (rtkey.error != dns_rcode_noerror ||
1309             rtkey.mode != DNS_TKEYMODE_DELETE ||
1310             rtkey.mode != qtkey.mode ||
1311             !dns_name_equal(&rtkey.algorithm, &qtkey.algorithm) ||
1312             rmsg->rcode != dns_rcode_noerror) {
1313                 tkey_log("dns_tkey_processdeleteresponse: tkey mode invalid "
1314                          "or error set(3)");
1315                 result = DNS_R_INVALIDTKEY;
1316                 dns_rdata_freestruct(&qtkey);
1317                 dns_rdata_freestruct(&rtkey);
1318                 goto failure;
1319         }
1320
1321         dns_rdata_freestruct(&qtkey);
1322
1323         RETERR(dns_tsigkey_find(&tsigkey, tkeyname, &rtkey.algorithm, ring));
1324
1325         dns_rdata_freestruct(&rtkey);
1326
1327         /*
1328          * Mark the key as deleted.
1329          */
1330         dns_tsigkey_setdeleted(tsigkey);
1331         /*
1332          * Release the reference.
1333          */
1334         dns_tsigkey_detach(&tsigkey);
1335
1336  failure:
1337         return (result);
1338 }
1339
1340 isc_result_t
1341 dns_tkey_gssnegotiate(dns_message_t *qmsg, dns_message_t *rmsg,
1342                       dns_name_t *server, gss_ctx_id_t *context,
1343                       dns_tsigkey_t **outkey, dns_tsig_keyring_t *ring,
1344                       isc_boolean_t win2k)
1345 {
1346         dns_rdata_t rtkeyrdata = DNS_RDATA_INIT, qtkeyrdata = DNS_RDATA_INIT;
1347         dns_name_t *tkeyname;
1348         dns_rdata_tkey_t rtkey, qtkey;
1349         isc_buffer_t intoken, outtoken;
1350         dst_key_t *dstkey = NULL;
1351         isc_result_t result;
1352         unsigned char array[1024];
1353
1354         REQUIRE(qmsg != NULL);
1355         REQUIRE(rmsg != NULL);
1356         REQUIRE(server != NULL);
1357         if (outkey != NULL)
1358                 REQUIRE(*outkey == NULL);
1359
1360         if (rmsg->rcode != dns_rcode_noerror)
1361                 return (ISC_RESULTCLASS_DNSRCODE + rmsg->rcode);
1362
1363         RETERR(find_tkey(rmsg, &tkeyname, &rtkeyrdata, DNS_SECTION_ANSWER));
1364         RETERR(dns_rdata_tostruct(&rtkeyrdata, &rtkey, NULL));
1365
1366         if (win2k == ISC_TRUE)
1367                 RETERR(find_tkey(qmsg, &tkeyname, &qtkeyrdata,
1368                          DNS_SECTION_ANSWER));
1369         else
1370                 RETERR(find_tkey(qmsg, &tkeyname, &qtkeyrdata,
1371                          DNS_SECTION_ADDITIONAL));
1372
1373         RETERR(dns_rdata_tostruct(&qtkeyrdata, &qtkey, NULL));
1374
1375         if (rtkey.error != dns_rcode_noerror ||
1376             rtkey.mode != DNS_TKEYMODE_GSSAPI ||
1377             !dns_name_equal(&rtkey.algorithm, &qtkey.algorithm))
1378         {
1379                 tkey_log("dns_tkey_processdhresponse: tkey mode invalid "
1380                          "or error set(4)");
1381                 result = DNS_R_INVALIDTKEY;
1382                 goto failure;
1383         }
1384
1385         isc_buffer_init(&intoken, rtkey.key, rtkey.keylen);
1386         isc_buffer_init(&outtoken, array, sizeof(array));
1387
1388         result = dst_gssapi_initctx(server, &intoken, &outtoken, context);
1389         if (result != DNS_R_CONTINUE && result != ISC_R_SUCCESS)
1390                 return (result);
1391
1392         dstkey = NULL;
1393         RETERR(dst_key_fromgssapi(dns_rootname, *context, rmsg->mctx,
1394                                   &dstkey));
1395
1396         /*
1397          * XXXSRA This seems confused.  If we got CONTINUE from initctx,
1398          * the GSS negotiation hasn't completed yet, so we can't sign
1399          * anything yet.
1400          */
1401
1402         RETERR(dns_tsigkey_createfromkey(tkeyname,
1403                                          (win2k
1404                                           ? DNS_TSIG_GSSAPIMS_NAME
1405                                           : DNS_TSIG_GSSAPI_NAME),
1406                                          dstkey, ISC_TRUE, NULL,
1407                                          rtkey.inception, rtkey.expire,
1408                                          ring->mctx, ring, outkey));
1409
1410         dns_rdata_freestruct(&rtkey);
1411         return (result);
1412
1413  failure:
1414         /*
1415          * XXXSRA This probably leaks memory from qtkey.
1416          */
1417         dns_rdata_freestruct(&rtkey);
1418         return (result);
1419 }