lib/dns/tkey.c

   1 /*
   2  * Copyright (C) 2004-2010  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 1.96 2010/12/09 00:54:34 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_name_t *name, dns_rdata_tkey_t *tkeyin,
 421                 dns_tkeyctx_t *tctx, dns_rdata_tkey_t *tkeyout,
 422                 dns_tsig_keyring_t *ring)
 423 {
 424         isc_result_t result = ISC_R_SUCCESS;
 425         dst_key_t *dstkey = NULL;
 426         dns_tsigkey_t *tsigkey = NULL;
 427         dns_fixedname_t principal;
 428         isc_stdtime_t now;
 429         isc_region_t intoken;
 430         isc_buffer_t *outtoken = NULL;
 431         gss_ctx_id_t gss_ctx = NULL;
 432
 433         if (tctx->gsscred == NULL)
 434                 return (ISC_R_NOPERM);
 435
 436         if (!dns_name_equal(&tkeyin->algorithm, DNS_TSIG_GSSAPI_NAME) &&
 437             !dns_name_equal(&tkeyin->algorithm, DNS_TSIG_GSSAPIMS_NAME)) {
 438                 tkeyout->error = dns_tsigerror_badalg;
 439                 tkey_log("process_gsstkey(): dns_tsigerror_badalg");    /* XXXSRA */
 440                 return (ISC_R_SUCCESS);
 441         }
 442
 443         /*
 444          * XXXDCL need to check for key expiry per 4.1.1
 445          * XXXDCL need a way to check fully established, perhaps w/key_flags
 446          */
 447
 448         intoken.base = tkeyin->key;
 449         intoken.length = tkeyin->keylen;
 450
 451         result = dns_tsigkey_find(&tsigkey, name, &tkeyin->algorithm, ring);
 452         if (result == ISC_R_SUCCESS)
 453                 gss_ctx = dst_key_getgssctx(tsigkey->key);
 454
 455         dns_fixedname_init(&principal);
 456
 457         result = dst_gssapi_acceptctx(tctx->gsscred, &intoken,
 458                                       &outtoken, &gss_ctx,
 459                                       dns_fixedname_name(&principal),
 460                                       tctx->mctx);
 461         if (result == DNS_R_INVALIDTKEY) {
 462                 if (tsigkey != NULL)
 463                         dns_tsigkey_detach(&tsigkey);
 464                 tkeyout->error = dns_tsigerror_badkey;
 465                 tkey_log("process_gsstkey(): dns_tsigerror_badkey");    /* XXXSRA */
 466                 return (ISC_R_SUCCESS);
 467         } else if (result == ISC_R_FAILURE)
 468                 goto failure;
 469         ENSURE(result == DNS_R_CONTINUE || result == ISC_R_SUCCESS);
 470         /*
 471          * XXXDCL Section 4.1.3: Limit GSS_S_CONTINUE_NEEDED to 10 times.
 472          */
 473
 474         isc_stdtime_get(&now);
 475
 476         if (tsigkey == NULL) {
 477 #ifdef GSSAPI
 478                 OM_uint32 gret, minor, lifetime;
 479 #endif
 480                 isc_uint32_t expire;
 481
 482                 RETERR(dst_key_fromgssapi(name, gss_ctx, ring->mctx, &dstkey));
 483                 /*
 484                  * Limit keys to 1 hour or the context's lifetime whichever
 485                  * is smaller.
 486                  */
 487                 expire = now + 3600;
 488 #ifdef GSSAPI
 489                 gret = gss_context_time(&minor, gss_ctx, &lifetime);
 490                 if (gret == GSS_S_COMPLETE && now + lifetime < expire)
 491                         expire = now + lifetime;
 492 #endif
 493                 RETERR(dns_tsigkey_createfromkey(name, &tkeyin->algorithm,
 494                                                  dstkey, ISC_TRUE,
 495                                                  dns_fixedname_name(&principal),
 496                                                  now, expire, ring->mctx, ring,
 497                                                  NULL));
 498                 dst_key_free(&dstkey);
 499                 tkeyout->inception = now;
 500                 tkeyout->expire = expire;
 501         } else {
 502                 tkeyout->inception = tsigkey->inception;
 503                 tkeyout->expire = tkeyout->expire;
 504                 dns_tsigkey_detach(&tsigkey);
 505         }
 506
 507         if (outtoken) {
 508                 tkeyout->key = isc_mem_get(tkeyout->mctx,
 509                                            isc_buffer_usedlength(outtoken));
 510                 if (tkeyout->key == NULL) {
 511                         result = ISC_R_NOMEMORY;
 512                         goto failure;
 513                 }
 514                 tkeyout->keylen = isc_buffer_usedlength(outtoken);
 515                 memcpy(tkeyout->key, isc_buffer_base(outtoken),
 516                        isc_buffer_usedlength(outtoken));
 517                 isc_buffer_free(&outtoken);
 518         } else {
 519                 tkeyout->key = isc_mem_get(tkeyout->mctx, tkeyin->keylen);
 520                 if (tkeyout->key == NULL) {
 521                         result = ISC_R_NOMEMORY;
 522                         goto failure;
 523                 }
 524                 tkeyout->keylen = tkeyin->keylen;
 525                 memcpy(tkeyout->key, tkeyin->key, tkeyin->keylen);
 526         }
 527
 528         tkeyout->error = dns_rcode_noerror;
 529
 530         tkey_log("process_gsstkey(): dns_tsigerror_noerror");   /* XXXSRA */
 531
 532         return (ISC_R_SUCCESS);
 533
 534 failure:
 535         if (tsigkey != NULL)
 536                 dns_tsigkey_detach(&tsigkey);
 537
 538         if (dstkey != NULL)
 539                 dst_key_free(&dstkey);
 540
 541         if (outtoken != NULL)
 542                 isc_buffer_free(&outtoken);
 543
 544         tkey_log("process_gsstkey(): %s",
 545                 isc_result_totext(result));     /* XXXSRA */
 546
 547         return (result);
 548 }
 549
 550 static isc_result_t
 551 process_deletetkey(dns_name_t *signer, dns_name_t *name,
 552                    dns_rdata_tkey_t *tkeyin, dns_rdata_tkey_t *tkeyout,
 553                    dns_tsig_keyring_t *ring)
 554 {
 555         isc_result_t result;
 556         dns_tsigkey_t *tsigkey = NULL;
 557         dns_name_t *identity;
 558
 559         result = dns_tsigkey_find(&tsigkey, name, &tkeyin->algorithm, ring);
 560         if (result != ISC_R_SUCCESS) {
 561                 tkeyout->error = dns_tsigerror_badname;
 562                 return (ISC_R_SUCCESS);
 563         }
 564
 565         /*
 566          * Only allow a delete if the identity that created the key is the
 567          * same as the identity that signed the message.
 568          */
 569         identity = dns_tsigkey_identity(tsigkey);
 570         if (identity == NULL || !dns_name_equal(identity, signer)) {
 571                 dns_tsigkey_detach(&tsigkey);
 572                 return (DNS_R_REFUSED);
 573         }
 574
 575         /*
 576          * Set the key to be deleted when no references are left.  If the key
 577          * was not generated with TKEY and is in the config file, it may be
 578          * reloaded later.
 579          */
 580         dns_tsigkey_setdeleted(tsigkey);
 581
 582         /* Release the reference */
 583         dns_tsigkey_detach(&tsigkey);
 584
 585         return (ISC_R_SUCCESS);
 586 }
 587
 588 isc_result_t
 589 dns_tkey_processquery(dns_message_t *msg, dns_tkeyctx_t *tctx,
 590                       dns_tsig_keyring_t *ring)
 591 {
 592         isc_result_t result = ISC_R_SUCCESS;
 593         dns_rdata_tkey_t tkeyin, tkeyout;
 594         isc_boolean_t freetkeyin = ISC_FALSE;
 595         dns_name_t *qname, *name, *keyname, *signer, tsigner;
 596         dns_fixedname_t fkeyname;
 597         dns_rdataset_t *tkeyset;
 598         dns_rdata_t rdata;
 599         dns_namelist_t namelist;
 600         char tkeyoutdata[512];
 601         isc_buffer_t tkeyoutbuf;
 602
 603         REQUIRE(msg != NULL);
 604         REQUIRE(tctx != NULL);
 605         REQUIRE(ring != NULL);
 606
 607         ISC_LIST_INIT(namelist);
 608
 609         /*
 610          * Interpret the question section.
 611          */
 612         result = dns_message_firstname(msg, DNS_SECTION_QUESTION);
 613         if (result != ISC_R_SUCCESS)
 614                 return (DNS_R_FORMERR);
 615
 616         qname = NULL;
 617         dns_message_currentname(msg, DNS_SECTION_QUESTION, &qname);
 618
 619         /*
 620          * Look for a TKEY record that matches the question.
 621          */
 622         tkeyset = NULL;
 623         name = NULL;
 624         result = dns_message_findname(msg, DNS_SECTION_ADDITIONAL, qname,
 625                                       dns_rdatatype_tkey, 0, &name, &tkeyset);
 626         if (result != ISC_R_SUCCESS) {
 627                 /*
 628                  * Try the answer section, since that's where Win2000
 629                  * puts it.
 630                  */
 631                 if (dns_message_findname(msg, DNS_SECTION_ANSWER, qname,
 632                                          dns_rdatatype_tkey, 0, &name,
 633                                          &tkeyset) != ISC_R_SUCCESS) {
 634                         result = DNS_R_FORMERR;
 635                         tkey_log("dns_tkey_processquery: couldn't find a TKEY "
 636                                  "matching the question");
 637                         goto failure;
 638                 }
 639         }
 640         result = dns_rdataset_first(tkeyset);
 641         if (result != ISC_R_SUCCESS) {
 642                 result = DNS_R_FORMERR;
 643                 goto failure;
 644         }
 645         dns_rdata_init(&rdata);
 646         dns_rdataset_current(tkeyset, &rdata);
 647
 648         RETERR(dns_rdata_tostruct(&rdata, &tkeyin, NULL));
 649         freetkeyin = ISC_TRUE;
 650
 651         if (tkeyin.error != dns_rcode_noerror) {
 652                 result = DNS_R_FORMERR;
 653                 goto failure;
 654         }
 655
 656         /*
 657          * Before we go any farther, verify that the message was signed.
 658          * GSSAPI TKEY doesn't require a signature, the rest do.
 659          */
 660         dns_name_init(&tsigner, NULL);
 661         result = dns_message_signer(msg, &tsigner);
 662         if (result != ISC_R_SUCCESS) {
 663                 if (tkeyin.mode == DNS_TKEYMODE_GSSAPI &&
 664                     result == ISC_R_NOTFOUND)
 665                        signer = NULL;
 666                 else {
 667                         tkey_log("dns_tkey_processquery: query was not "
 668                                  "properly signed - rejecting");
 669                         result = DNS_R_FORMERR;
 670                         goto failure;
 671                 }
 672         } else
 673                 signer = &tsigner;
 674
 675         tkeyout.common.rdclass = tkeyin.common.rdclass;
 676         tkeyout.common.rdtype = tkeyin.common.rdtype;
 677         ISC_LINK_INIT(&tkeyout.common, link);
 678         tkeyout.mctx = msg->mctx;
 679
 680         dns_name_init(&tkeyout.algorithm, NULL);
 681         dns_name_clone(&tkeyin.algorithm, &tkeyout.algorithm);
 682
 683         tkeyout.inception = tkeyout.expire = 0;
 684         tkeyout.mode = tkeyin.mode;
 685         tkeyout.error = 0;
 686         tkeyout.keylen = tkeyout.otherlen = 0;
 687         tkeyout.key = tkeyout.other = NULL;
 688
 689         /*
 690          * A delete operation must have a fully specified key name.  If this
 691          * is not a delete, we do the following:
 692          * if (qname != ".")
 693          *      keyname = qname + defaultdomain
 694          * else
 695          *      keyname = <random hex> + defaultdomain
 696          */
 697         if (tkeyin.mode != DNS_TKEYMODE_DELETE) {
 698                 dns_tsigkey_t *tsigkey = NULL;
 699
 700                 if (tctx->domain == NULL && tkeyin.mode != DNS_TKEYMODE_GSSAPI) {
 701                         tkey_log("dns_tkey_processquery: tkey-domain not set");
 702                         result = DNS_R_REFUSED;
 703                         goto failure;
 704                 }
 705
 706                 dns_fixedname_init(&fkeyname);
 707                 keyname = dns_fixedname_name(&fkeyname);
 708
 709                 if (!dns_name_equal(qname, dns_rootname)) {
 710                         unsigned int n = dns_name_countlabels(qname);
 711                         RUNTIME_CHECK(dns_name_copy(qname, keyname, NULL)
 712                                       == ISC_R_SUCCESS);
 713                         dns_name_getlabelsequence(keyname, 0, n - 1, keyname);
 714                 } else {
 715                         static char hexdigits[16] = {
 716                                 '0', '1', '2', '3', '4', '5', '6', '7',
 717                                 '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
 718                         unsigned char randomdata[16];
 719                         char randomtext[32];
 720                         isc_buffer_t b;
 721                         unsigned int i, j;
 722
 723                         result = isc_entropy_getdata(tctx->ectx,
 724                                                      randomdata,
 725                                                      sizeof(randomdata),
 726                                                      NULL, 0);
 727                         if (result != ISC_R_SUCCESS)
 728                                 goto failure;
 729
 730                         for (i = 0, j = 0; i < sizeof(randomdata); i++) {
 731                                 unsigned char val = randomdata[i];
 732                                 randomtext[j++] = hexdigits[val >> 4];
 733                                 randomtext[j++] = hexdigits[val & 0xF];
 734                         }
 735                         isc_buffer_init(&b, randomtext, sizeof(randomtext));
 736                         isc_buffer_add(&b, sizeof(randomtext));
 737                         result = dns_name_fromtext(keyname, &b, NULL, 0, NULL);
 738                         if (result != ISC_R_SUCCESS)
 739                                 goto failure;
 740                 }
 741
 742                 if (tkeyin.mode == DNS_TKEYMODE_GSSAPI) {
 743                         /* Yup.  This is a hack */
 744                         result = dns_name_concatenate(keyname, dns_rootname,
 745                                                       keyname, NULL);
 746                         if (result != ISC_R_SUCCESS)
 747                                 goto failure;
 748                 } else {
 749                         result = dns_name_concatenate(keyname, tctx->domain,
 750                                                       keyname, NULL);
 751                         if (result != ISC_R_SUCCESS)
 752                                 goto failure;
 753                 }
 754
 755                 result = dns_tsigkey_find(&tsigkey, keyname, NULL, ring);
 756
 757                 if (result == ISC_R_SUCCESS) {
 758                         tkeyout.error = dns_tsigerror_badname;
 759                         dns_tsigkey_detach(&tsigkey);
 760                         goto failure_with_tkey;
 761                 } else if (result != ISC_R_NOTFOUND)
 762                         goto failure;
 763         } else
 764                 keyname = qname;
 765
 766         switch (tkeyin.mode) {
 767                 case DNS_TKEYMODE_DIFFIEHELLMAN:
 768                         tkeyout.error = dns_rcode_noerror;
 769                         RETERR(process_dhtkey(msg, signer, keyname, &tkeyin,
 770                                               tctx, &tkeyout, ring,
 771                                               &namelist));
 772                         break;
 773                 case DNS_TKEYMODE_GSSAPI:
 774                         tkeyout.error = dns_rcode_noerror;
 775                         RETERR(process_gsstkey(keyname, &tkeyin, tctx,
 776                                                &tkeyout, ring));
 777                         break;
 778                 case DNS_TKEYMODE_DELETE:
 779                         tkeyout.error = dns_rcode_noerror;
 780                         RETERR(process_deletetkey(signer, keyname, &tkeyin,
 781                                                   &tkeyout, ring));
 782                         break;
 783                 case DNS_TKEYMODE_SERVERASSIGNED:
 784                 case DNS_TKEYMODE_RESOLVERASSIGNED:
 785                         result = DNS_R_NOTIMP;
 786                         goto failure;
 787                 default:
 788                         tkeyout.error = dns_tsigerror_badmode;
 789         }
 790
 791  failure_with_tkey:
 792         dns_rdata_init(&rdata);
 793         isc_buffer_init(&tkeyoutbuf, tkeyoutdata, sizeof(tkeyoutdata));
 794         result = dns_rdata_fromstruct(&rdata, tkeyout.common.rdclass,
 795                                       tkeyout.common.rdtype, &tkeyout,
 796                                       &tkeyoutbuf);
 797
 798         if (freetkeyin) {
 799                 dns_rdata_freestruct(&tkeyin);
 800                 freetkeyin = ISC_FALSE;
 801         }
 802
 803         if (tkeyout.key != NULL)
 804                 isc_mem_put(tkeyout.mctx, tkeyout.key, tkeyout.keylen);
 805         if (tkeyout.other != NULL)
 806                 isc_mem_put(tkeyout.mctx, tkeyout.other, tkeyout.otherlen);
 807         if (result != ISC_R_SUCCESS)
 808                 goto failure;
 809
 810         RETERR(add_rdata_to_list(msg, keyname, &rdata, 0, &namelist));
 811
 812         RETERR(dns_message_reply(msg, ISC_TRUE));
 813
 814         name = ISC_LIST_HEAD(namelist);
 815         while (name != NULL) {
 816                 dns_name_t *next = ISC_LIST_NEXT(name, link);
 817                 ISC_LIST_UNLINK(namelist, name, link);
 818                 dns_message_addname(msg, name, DNS_SECTION_ANSWER);
 819                 name = next;
 820         }
 821
 822         return (ISC_R_SUCCESS);
 823
 824  failure:
 825         if (freetkeyin)
 826                 dns_rdata_freestruct(&tkeyin);
 827         if (!ISC_LIST_EMPTY(namelist))
 828                 free_namelist(msg, &namelist);
 829         return (result);
 830 }
 831
 832 static isc_result_t
 833 buildquery(dns_message_t *msg, dns_name_t *name,
 834            dns_rdata_tkey_t *tkey, isc_boolean_t win2k)
 835 {
 836         dns_name_t *qname = NULL, *aname = NULL;
 837         dns_rdataset_t *question = NULL, *tkeyset = NULL;
 838         dns_rdatalist_t *tkeylist = NULL;
 839         dns_rdata_t *rdata = NULL;
 840         isc_buffer_t *dynbuf = NULL;
 841         isc_result_t result;
 842
 843         REQUIRE(msg != NULL);
 844         REQUIRE(name != NULL);
 845         REQUIRE(tkey != NULL);
 846
 847         RETERR(dns_message_gettempname(msg, &qname));
 848         RETERR(dns_message_gettempname(msg, &aname));
 849
 850         RETERR(dns_message_gettemprdataset(msg, &question));
 851         dns_rdataset_init(question);
 852         dns_rdataset_makequestion(question, dns_rdataclass_any,
 853                                   dns_rdatatype_tkey);
 854
 855         RETERR(isc_buffer_allocate(msg->mctx, &dynbuf, 4096));
 856         RETERR(dns_message_gettemprdata(msg, &rdata));
 857
 858         RETERR(dns_rdata_fromstruct(rdata, dns_rdataclass_any,
 859                                     dns_rdatatype_tkey, tkey, dynbuf));
 860         dns_message_takebuffer(msg, &dynbuf);
 861
 862         RETERR(dns_message_gettemprdatalist(msg, &tkeylist));
 863         tkeylist->rdclass = dns_rdataclass_any;
 864         tkeylist->type = dns_rdatatype_tkey;
 865         tkeylist->covers = 0;
 866         tkeylist->ttl = 0;
 867         ISC_LIST_INIT(tkeylist->rdata);
 868         ISC_LIST_APPEND(tkeylist->rdata, rdata, link);
 869
 870         RETERR(dns_message_gettemprdataset(msg, &tkeyset));
 871         dns_rdataset_init(tkeyset);
 872         RETERR(dns_rdatalist_tordataset(tkeylist, tkeyset));
 873
 874         dns_name_init(qname, NULL);
 875         dns_name_clone(name, qname);
 876
 877         dns_name_init(aname, NULL);
 878         dns_name_clone(name, aname);
 879
 880         ISC_LIST_APPEND(qname->list, question, link);
 881         ISC_LIST_APPEND(aname->list, tkeyset, link);
 882
 883         dns_message_addname(msg, qname, DNS_SECTION_QUESTION);
 884
 885         /*
 886          * Windows 2000 needs this in the answer section, not the additional
 887          * section where the RFC specifies.
 888          */
 889         if (win2k)
 890                 dns_message_addname(msg, aname, DNS_SECTION_ANSWER);
 891         else
 892                 dns_message_addname(msg, aname, DNS_SECTION_ADDITIONAL);
 893
 894         return (ISC_R_SUCCESS);
 895
 896  failure:
 897         if (qname != NULL)
 898                 dns_message_puttempname(msg, &qname);
 899         if (aname != NULL)
 900                 dns_message_puttempname(msg, &aname);
 901         if (question != NULL) {
 902                 dns_rdataset_disassociate(question);
 903                 dns_message_puttemprdataset(msg, &question);
 904         }
 905         if (dynbuf != NULL)
 906                 isc_buffer_free(&dynbuf);
 907         printf("buildquery error\n");
 908         return (result);
 909 }
 910
 911 isc_result_t
 912 dns_tkey_builddhquery(dns_message_t *msg, dst_key_t *key, dns_name_t *name,
 913                       dns_name_t *algorithm, isc_buffer_t *nonce,
 914                       isc_uint32_t lifetime)
 915 {
 916         dns_rdata_tkey_t tkey;
 917         dns_rdata_t *rdata = NULL;
 918         isc_buffer_t *dynbuf = NULL;
 919         isc_region_t r;
 920         dns_name_t keyname;
 921         dns_namelist_t namelist;
 922         isc_result_t result;
 923         isc_stdtime_t now;
 924
 925         REQUIRE(msg != NULL);
 926         REQUIRE(key != NULL);
 927         REQUIRE(dst_key_alg(key) == DNS_KEYALG_DH);
 928         REQUIRE(dst_key_isprivate(key));
 929         REQUIRE(name != NULL);
 930         REQUIRE(algorithm != NULL);
 931
 932         tkey.common.rdclass = dns_rdataclass_any;
 933         tkey.common.rdtype = dns_rdatatype_tkey;
 934         ISC_LINK_INIT(&tkey.common, link);
 935         tkey.mctx = msg->mctx;
 936         dns_name_init(&tkey.algorithm, NULL);
 937         dns_name_clone(algorithm, &tkey.algorithm);
 938         isc_stdtime_get(&now);
 939         tkey.inception = now;
 940         tkey.expire = now + lifetime;
 941         tkey.mode = DNS_TKEYMODE_DIFFIEHELLMAN;
 942         if (nonce != NULL)
 943                 isc_buffer_usedregion(nonce, &r);
 944         else {
 945                 r.base = isc_mem_get(msg->mctx, 0);
 946                 r.length = 0;
 947         }
 948         tkey.error = 0;
 949         tkey.key = r.base;
 950         tkey.keylen =  r.length;
 951         tkey.other = NULL;
 952         tkey.otherlen = 0;
 953
 954         RETERR(buildquery(msg, name, &tkey, ISC_FALSE));
 955
 956         if (nonce == NULL)
 957                 isc_mem_put(msg->mctx, r.base, 0);
 958
 959         RETERR(dns_message_gettemprdata(msg, &rdata));
 960         RETERR(isc_buffer_allocate(msg->mctx, &dynbuf, 1024));
 961         RETERR(dst_key_todns(key, dynbuf));
 962         isc_buffer_usedregion(dynbuf, &r);
 963         dns_rdata_fromregion(rdata, dns_rdataclass_any,
 964                              dns_rdatatype_key, &r);
 965         dns_message_takebuffer(msg, &dynbuf);
 966
 967         dns_name_init(&keyname, NULL);
 968         dns_name_clone(dst_key_name(key), &keyname);
 969
 970         ISC_LIST_INIT(namelist);
 971         RETERR(add_rdata_to_list(msg, &keyname, rdata, 0, &namelist));
 972         dns_message_addname(msg, ISC_LIST_HEAD(namelist),
 973                             DNS_SECTION_ADDITIONAL);
 974
 975         return (ISC_R_SUCCESS);
 976
 977  failure:
 978
 979         if (dynbuf != NULL)
 980                 isc_buffer_free(&dynbuf);
 981         return (result);
 982 }
 983
 984 isc_result_t
 985 dns_tkey_buildgssquery(dns_message_t *msg, dns_name_t *name, dns_name_t *gname,
 986                        isc_buffer_t *intoken, isc_uint32_t lifetime,
 987                        gss_ctx_id_t *context, isc_boolean_t win2k)
 988 {
 989         dns_rdata_tkey_t tkey;
 990         isc_result_t result;
 991         isc_stdtime_t now;
 992         isc_buffer_t token;
 993         unsigned char array[4096];
 994
 995         UNUSED(intoken);
 996
 997         REQUIRE(msg != NULL);
 998         REQUIRE(name != NULL);
 999         REQUIRE(gname != NULL);
1000         REQUIRE(context != NULL);
1001
1002         isc_buffer_init(&token, array, sizeof(array));
1003         result = dst_gssapi_initctx(gname, NULL, &token, context);
1004         if (result != DNS_R_CONTINUE && result != ISC_R_SUCCESS)
1005                 return (result);
1006
1007         tkey.common.rdclass = dns_rdataclass_any;
1008         tkey.common.rdtype = dns_rdatatype_tkey;
1009         ISC_LINK_INIT(&tkey.common, link);
1010         tkey.mctx = NULL;
1011         dns_name_init(&tkey.algorithm, NULL);
1012
1013         if (win2k)
1014                 dns_name_clone(DNS_TSIG_GSSAPIMS_NAME, &tkey.algorithm);
1015         else
1016                 dns_name_clone(DNS_TSIG_GSSAPI_NAME, &tkey.algorithm);
1017
1018         isc_stdtime_get(&now);
1019         tkey.inception = now;
1020         tkey.expire = now + lifetime;
1021         tkey.mode = DNS_TKEYMODE_GSSAPI;
1022         tkey.error = 0;
1023         tkey.key = isc_buffer_base(&token);
1024         tkey.keylen = isc_buffer_usedlength(&token);
1025         tkey.other = NULL;
1026         tkey.otherlen = 0;
1027
1028         RETERR(buildquery(msg, name, &tkey, win2k));
1029
1030         return (ISC_R_SUCCESS);
1031
1032  failure:
1033         return (result);
1034 }
1035
1036 isc_result_t
1037 dns_tkey_builddeletequery(dns_message_t *msg, dns_tsigkey_t *key) {
1038         dns_rdata_tkey_t tkey;
1039
1040         REQUIRE(msg != NULL);
1041         REQUIRE(key != NULL);
1042
1043         tkey.common.rdclass = dns_rdataclass_any;
1044         tkey.common.rdtype = dns_rdatatype_tkey;
1045         ISC_LINK_INIT(&tkey.common, link);
1046         tkey.mctx = msg->mctx;
1047         dns_name_init(&tkey.algorithm, NULL);
1048         dns_name_clone(key->algorithm, &tkey.algorithm);
1049         tkey.inception = tkey.expire = 0;
1050         tkey.mode = DNS_TKEYMODE_DELETE;
1051         tkey.error = 0;
1052         tkey.keylen = tkey.otherlen = 0;
1053         tkey.key = tkey.other = NULL;
1054
1055         return (buildquery(msg, &key->name, &tkey, ISC_FALSE));
1056 }
1057
1058 static isc_result_t
1059 find_tkey(dns_message_t *msg, dns_name_t **name, dns_rdata_t *rdata,
1060           int section)
1061 {
1062         dns_rdataset_t *tkeyset;
1063         isc_result_t result;
1064
1065         result = dns_message_firstname(msg, section);
1066         while (result == ISC_R_SUCCESS) {
1067                 *name = NULL;
1068                 dns_message_currentname(msg, section, name);
1069                 tkeyset = NULL;
1070                 result = dns_message_findtype(*name, dns_rdatatype_tkey, 0,
1071                                               &tkeyset);
1072                 if (result == ISC_R_SUCCESS) {
1073                         result = dns_rdataset_first(tkeyset);
1074                         if (result != ISC_R_SUCCESS)
1075                                 return (result);
1076                         dns_rdataset_current(tkeyset, rdata);
1077                         return (ISC_R_SUCCESS);
1078                 }
1079                 result = dns_message_nextname(msg, section);
1080         }
1081         if (result == ISC_R_NOMORE)
1082                 return (ISC_R_NOTFOUND);
1083         return (result);
1084 }
1085
1086 isc_result_t
1087 dns_tkey_processdhresponse(dns_message_t *qmsg, dns_message_t *rmsg,
1088                            dst_key_t *key, isc_buffer_t *nonce,
1089                            dns_tsigkey_t **outkey, dns_tsig_keyring_t *ring)
1090 {
1091         dns_rdata_t qtkeyrdata = DNS_RDATA_INIT, rtkeyrdata = DNS_RDATA_INIT;
1092         dns_name_t keyname, *tkeyname, *theirkeyname, *ourkeyname, *tempname;
1093         dns_rdataset_t *theirkeyset = NULL, *ourkeyset = NULL;
1094         dns_rdata_t theirkeyrdata = DNS_RDATA_INIT;
1095         dst_key_t *theirkey = NULL;
1096         dns_rdata_tkey_t qtkey, rtkey;
1097         unsigned char secretdata[256];
1098         unsigned int sharedsize;
1099         isc_buffer_t *shared = NULL, secret;
1100         isc_region_t r, r2;
1101         isc_result_t result;
1102         isc_boolean_t freertkey = ISC_FALSE;
1103
1104         REQUIRE(qmsg != NULL);
1105         REQUIRE(rmsg != NULL);
1106         REQUIRE(key != NULL);
1107         REQUIRE(dst_key_alg(key) == DNS_KEYALG_DH);
1108         REQUIRE(dst_key_isprivate(key));
1109         if (outkey != NULL)
1110                 REQUIRE(*outkey == NULL);
1111
1112         if (rmsg->rcode != dns_rcode_noerror)
1113                 return (ISC_RESULTCLASS_DNSRCODE + rmsg->rcode);
1114         RETERR(find_tkey(rmsg, &tkeyname, &rtkeyrdata, DNS_SECTION_ANSWER));
1115         RETERR(dns_rdata_tostruct(&rtkeyrdata, &rtkey, NULL));
1116         freertkey = ISC_TRUE;
1117
1118         RETERR(find_tkey(qmsg, &tempname, &qtkeyrdata,
1119                          DNS_SECTION_ADDITIONAL));
1120         RETERR(dns_rdata_tostruct(&qtkeyrdata, &qtkey, NULL));
1121
1122         if (rtkey.error != dns_rcode_noerror ||
1123             rtkey.mode != DNS_TKEYMODE_DIFFIEHELLMAN ||
1124             rtkey.mode != qtkey.mode ||
1125             !dns_name_equal(&rtkey.algorithm, &qtkey.algorithm) ||
1126             rmsg->rcode != dns_rcode_noerror) {
1127                 tkey_log("dns_tkey_processdhresponse: tkey mode invalid "
1128                          "or error set(1)");
1129                 result = DNS_R_INVALIDTKEY;
1130                 dns_rdata_freestruct(&qtkey);
1131                 goto failure;
1132         }
1133
1134         dns_rdata_freestruct(&qtkey);
1135
1136         dns_name_init(&keyname, NULL);
1137         dns_name_clone(dst_key_name(key), &keyname);
1138
1139         ourkeyname = NULL;
1140         ourkeyset = NULL;
1141         RETERR(dns_message_findname(rmsg, DNS_SECTION_ANSWER, &keyname,
1142                                     dns_rdatatype_key, 0, &ourkeyname,
1143                                     &ourkeyset));
1144
1145         result = dns_message_firstname(rmsg, DNS_SECTION_ANSWER);
1146         while (result == ISC_R_SUCCESS) {
1147                 theirkeyname = NULL;
1148                 dns_message_currentname(rmsg, DNS_SECTION_ANSWER,
1149                                         &theirkeyname);
1150                 if (dns_name_equal(theirkeyname, ourkeyname))
1151                         goto next;
1152                 theirkeyset = NULL;
1153                 result = dns_message_findtype(theirkeyname, dns_rdatatype_key,
1154                                               0, &theirkeyset);
1155                 if (result == ISC_R_SUCCESS) {
1156                         RETERR(dns_rdataset_first(theirkeyset));
1157                         break;
1158                 }
1159  next:
1160                 result = dns_message_nextname(rmsg, DNS_SECTION_ANSWER);
1161         }
1162
1163         if (theirkeyset == NULL) {
1164                 tkey_log("dns_tkey_processdhresponse: failed to find server "
1165                          "key");
1166                 result = ISC_R_NOTFOUND;
1167                 goto failure;
1168         }
1169
1170         dns_rdataset_current(theirkeyset, &theirkeyrdata);
1171         RETERR(dns_dnssec_keyfromrdata(theirkeyname, &theirkeyrdata,
1172                                        rmsg->mctx, &theirkey));
1173
1174         RETERR(dst_key_secretsize(key, &sharedsize));
1175         RETERR(isc_buffer_allocate(rmsg->mctx, &shared, sharedsize));
1176
1177         RETERR(dst_key_computesecret(theirkey, key, shared));
1178
1179         isc_buffer_init(&secret, secretdata, sizeof(secretdata));
1180
1181         r.base = rtkey.key;
1182         r.length = rtkey.keylen;
1183         if (nonce != NULL)
1184                 isc_buffer_usedregion(nonce, &r2);
1185         else {
1186                 r2.base = isc_mem_get(rmsg->mctx, 0);
1187                 r2.length = 0;
1188         }
1189         RETERR(compute_secret(shared, &r2, &r, &secret));
1190         if (nonce == NULL)
1191                 isc_mem_put(rmsg->mctx, r2.base, 0);
1192
1193         isc_buffer_usedregion(&secret, &r);
1194         result = dns_tsigkey_create(tkeyname, &rtkey.algorithm,
1195                                     r.base, r.length, ISC_TRUE,
1196                                     NULL, rtkey.inception, rtkey.expire,
1197                                     rmsg->mctx, ring, outkey);
1198         isc_buffer_free(&shared);
1199         dns_rdata_freestruct(&rtkey);
1200         dst_key_free(&theirkey);
1201         return (result);
1202
1203  failure:
1204         if (shared != NULL)
1205                 isc_buffer_free(&shared);
1206
1207         if (theirkey != NULL)
1208                 dst_key_free(&theirkey);
1209
1210         if (freertkey)
1211                 dns_rdata_freestruct(&rtkey);
1212
1213         return (result);
1214 }
1215
1216 isc_result_t
1217 dns_tkey_processgssresponse(dns_message_t *qmsg, dns_message_t *rmsg,
1218                             dns_name_t *gname, gss_ctx_id_t *context,
1219                             isc_buffer_t *outtoken, dns_tsigkey_t **outkey,
1220                             dns_tsig_keyring_t *ring)
1221 {
1222         dns_rdata_t rtkeyrdata = DNS_RDATA_INIT, qtkeyrdata = DNS_RDATA_INIT;
1223         dns_name_t *tkeyname;
1224         dns_rdata_tkey_t rtkey, qtkey;
1225         dst_key_t *dstkey = NULL;
1226         isc_buffer_t intoken;
1227         isc_result_t result;
1228         unsigned char array[1024];
1229
1230         REQUIRE(outtoken != NULL);
1231         REQUIRE(qmsg != NULL);
1232         REQUIRE(rmsg != NULL);
1233         REQUIRE(gname != NULL);
1234         if (outkey != NULL)
1235                 REQUIRE(*outkey == NULL);
1236
1237         if (rmsg->rcode != dns_rcode_noerror)
1238                 return (ISC_RESULTCLASS_DNSRCODE + rmsg->rcode);
1239         RETERR(find_tkey(rmsg, &tkeyname, &rtkeyrdata, DNS_SECTION_ANSWER));
1240         RETERR(dns_rdata_tostruct(&rtkeyrdata, &rtkey, NULL));
1241
1242         /*
1243          * Win2k puts the item in the ANSWER section, while the RFC
1244          * specifies it should be in the ADDITIONAL section.  Check first
1245          * where it should be, and then where it may be.
1246          */
1247         result = find_tkey(qmsg, &tkeyname, &qtkeyrdata,
1248                            DNS_SECTION_ADDITIONAL);
1249         if (result == ISC_R_NOTFOUND)
1250                 result = find_tkey(qmsg, &tkeyname, &qtkeyrdata,
1251                                    DNS_SECTION_ANSWER);
1252         if (result != ISC_R_SUCCESS)
1253                 goto failure;
1254
1255         RETERR(dns_rdata_tostruct(&qtkeyrdata, &qtkey, NULL));
1256
1257         if (rtkey.error != dns_rcode_noerror ||
1258             rtkey.mode != DNS_TKEYMODE_GSSAPI ||
1259             !dns_name_equal(&rtkey.algorithm, &qtkey.algorithm)) {
1260                 tkey_log("dns_tkey_processgssresponse: tkey mode invalid "
1261                          "or error set(2) %d", rtkey.error);
1262                 _dns_tkey_dumpmessage(qmsg);
1263                 _dns_tkey_dumpmessage(rmsg);
1264                 result = DNS_R_INVALIDTKEY;
1265                 goto failure;
1266         }
1267
1268         isc_buffer_init(outtoken, array, sizeof(array));
1269         isc_buffer_init(&intoken, rtkey.key, rtkey.keylen);
1270         RETERR(dst_gssapi_initctx(gname, &intoken, outtoken, context));
1271
1272         RETERR(dst_key_fromgssapi(dns_rootname, *context, rmsg->mctx,
1273                                   &dstkey));
1274
1275         RETERR(dns_tsigkey_createfromkey(tkeyname, DNS_TSIG_GSSAPI_NAME,
1276                                          dstkey, ISC_FALSE, NULL,
1277                                          rtkey.inception, rtkey.expire,
1278                                          ring->mctx, ring, outkey));
1279         dst_key_free(&dstkey);
1280         dns_rdata_freestruct(&rtkey);
1281         return (result);
1282
1283  failure:
1284         /*
1285          * XXXSRA This probably leaks memory from rtkey and qtkey.
1286          */
1287         if (dstkey != NULL)
1288                 dst_key_free(&dstkey);
1289         return (result);
1290 }
1291
1292 isc_result_t
1293 dns_tkey_processdeleteresponse(dns_message_t *qmsg, dns_message_t *rmsg,
1294                                dns_tsig_keyring_t *ring)
1295 {
1296         dns_rdata_t qtkeyrdata = DNS_RDATA_INIT, rtkeyrdata = DNS_RDATA_INIT;
1297         dns_name_t *tkeyname, *tempname;
1298         dns_rdata_tkey_t qtkey, rtkey;
1299         dns_tsigkey_t *tsigkey = NULL;
1300         isc_result_t result;
1301
1302         REQUIRE(qmsg != NULL);
1303         REQUIRE(rmsg != NULL);
1304
1305         if (rmsg->rcode != dns_rcode_noerror)
1306                 return(ISC_RESULTCLASS_DNSRCODE + rmsg->rcode);
1307
1308         RETERR(find_tkey(rmsg, &tkeyname, &rtkeyrdata, DNS_SECTION_ANSWER));
1309         RETERR(dns_rdata_tostruct(&rtkeyrdata, &rtkey, NULL));
1310
1311         RETERR(find_tkey(qmsg, &tempname, &qtkeyrdata,
1312                          DNS_SECTION_ADDITIONAL));
1313         RETERR(dns_rdata_tostruct(&qtkeyrdata, &qtkey, NULL));
1314
1315         if (rtkey.error != dns_rcode_noerror ||
1316             rtkey.mode != DNS_TKEYMODE_DELETE ||
1317             rtkey.mode != qtkey.mode ||
1318             !dns_name_equal(&rtkey.algorithm, &qtkey.algorithm) ||
1319             rmsg->rcode != dns_rcode_noerror) {
1320                 tkey_log("dns_tkey_processdeleteresponse: tkey mode invalid "
1321                          "or error set(3)");
1322                 result = DNS_R_INVALIDTKEY;
1323                 dns_rdata_freestruct(&qtkey);
1324                 dns_rdata_freestruct(&rtkey);
1325                 goto failure;
1326         }
1327
1328         dns_rdata_freestruct(&qtkey);
1329
1330         RETERR(dns_tsigkey_find(&tsigkey, tkeyname, &rtkey.algorithm, ring));
1331
1332         dns_rdata_freestruct(&rtkey);
1333
1334         /*
1335          * Mark the key as deleted.
1336          */
1337         dns_tsigkey_setdeleted(tsigkey);
1338         /*
1339          * Release the reference.
1340          */
1341         dns_tsigkey_detach(&tsigkey);
1342
1343  failure:
1344         return (result);
1345 }
1346
1347 isc_result_t
1348 dns_tkey_gssnegotiate(dns_message_t *qmsg, dns_message_t *rmsg,
1349                       dns_name_t *server, gss_ctx_id_t *context,
1350                       dns_tsigkey_t **outkey, dns_tsig_keyring_t *ring,
1351                       isc_boolean_t win2k)
1352 {
1353         dns_rdata_t rtkeyrdata = DNS_RDATA_INIT, qtkeyrdata = DNS_RDATA_INIT;
1354         dns_name_t *tkeyname;
1355         dns_rdata_tkey_t rtkey, qtkey;
1356         isc_buffer_t intoken, outtoken;
1357         dst_key_t *dstkey = NULL;
1358         isc_result_t result;
1359         unsigned char array[1024];
1360
1361         REQUIRE(qmsg != NULL);
1362         REQUIRE(rmsg != NULL);
1363         REQUIRE(server != NULL);
1364         if (outkey != NULL)
1365                 REQUIRE(*outkey == NULL);
1366
1367         if (rmsg->rcode != dns_rcode_noerror)
1368                 return (ISC_RESULTCLASS_DNSRCODE + rmsg->rcode);
1369
1370         RETERR(find_tkey(rmsg, &tkeyname, &rtkeyrdata, DNS_SECTION_ANSWER));
1371         RETERR(dns_rdata_tostruct(&rtkeyrdata, &rtkey, NULL));
1372
1373         if (win2k == ISC_TRUE)
1374                 RETERR(find_tkey(qmsg, &tkeyname, &qtkeyrdata,
1375                                  DNS_SECTION_ANSWER));
1376         else
1377                 RETERR(find_tkey(qmsg, &tkeyname, &qtkeyrdata,
1378                                  DNS_SECTION_ADDITIONAL));
1379
1380         RETERR(dns_rdata_tostruct(&qtkeyrdata, &qtkey, NULL));
1381
1382         if (rtkey.error != dns_rcode_noerror ||
1383             rtkey.mode != DNS_TKEYMODE_GSSAPI ||
1384             !dns_name_equal(&rtkey.algorithm, &qtkey.algorithm))
1385         {
1386                 tkey_log("dns_tkey_processdhresponse: tkey mode invalid "
1387                          "or error set(4)");
1388                 result = DNS_R_INVALIDTKEY;
1389                 goto failure;
1390         }
1391
1392         isc_buffer_init(&intoken, rtkey.key, rtkey.keylen);
1393         isc_buffer_init(&outtoken, array, sizeof(array));
1394
1395         result = dst_gssapi_initctx(server, &intoken, &outtoken, context);
1396         if (result != DNS_R_CONTINUE && result != ISC_R_SUCCESS)
1397                 return (result);
1398
1399         RETERR(dst_key_fromgssapi(dns_rootname, *context, rmsg->mctx,
1400                                   &dstkey));
1401
1402         /*
1403          * XXXSRA This seems confused.  If we got CONTINUE from initctx,
1404          * the GSS negotiation hasn't completed yet, so we can't sign
1405          * anything yet.
1406          */
1407
1408         RETERR(dns_tsigkey_createfromkey(tkeyname,
1409                                          (win2k
1410                                           ? DNS_TSIG_GSSAPIMS_NAME
1411                                           : DNS_TSIG_GSSAPI_NAME),
1412                                          dstkey, ISC_TRUE, NULL,
1413                                          rtkey.inception, rtkey.expire,
1414                                          ring->mctx, ring, outkey));
1415         dst_key_free(&dstkey);
1416         dns_rdata_freestruct(&rtkey);
1417         return (result);
1418
1419  failure:
1420         /*
1421          * XXXSRA This probably leaks memory from qtkey.
1422          */
1423         dns_rdata_freestruct(&rtkey);
1424         if (dstkey != NULL)
1425                 dst_key_free(&dstkey);
1426         return (result);
1427 }