contrib/bind9/lib/dns/tkey.c

   1 /*
   2  * Copyright (C) 2004-2014  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  * $Id$
  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         if (result != ISC_R_SUCCESS)
  79                 fprintf(stderr, "Warning: dns_message_totext returned: %s\n",
  80                         dns_result_totext(result));
  81         fprintf(stderr, "%.*s\n", (int)isc_buffer_usedlength(&outbuf),
  82                 (char *)isc_buffer_base(&outbuf));
  83 }
  84
  85 isc_result_t
  86 dns_tkeyctx_create(isc_mem_t *mctx, isc_entropy_t *ectx, dns_tkeyctx_t **tctxp)
  87 {
  88         dns_tkeyctx_t *tctx;
  89
  90         REQUIRE(mctx != NULL);
  91         REQUIRE(ectx != NULL);
  92         REQUIRE(tctxp != NULL && *tctxp == NULL);
  93
  94         tctx = isc_mem_get(mctx, sizeof(dns_tkeyctx_t));
  95         if (tctx == NULL)
  96                 return (ISC_R_NOMEMORY);
  97         tctx->mctx = NULL;
  98         isc_mem_attach(mctx, &tctx->mctx);
  99         tctx->ectx = NULL;
 100         isc_entropy_attach(ectx, &tctx->ectx);
 101         tctx->dhkey = NULL;
 102         tctx->domain = NULL;
 103         tctx->gsscred = NULL;
 104         tctx->gssapi_keytab = NULL;
 105
 106         *tctxp = tctx;
 107         return (ISC_R_SUCCESS);
 108 }
 109
 110 void
 111 dns_tkeyctx_destroy(dns_tkeyctx_t **tctxp) {
 112         isc_mem_t *mctx;
 113         dns_tkeyctx_t *tctx;
 114
 115         REQUIRE(tctxp != NULL && *tctxp != NULL);
 116
 117         tctx = *tctxp;
 118         mctx = tctx->mctx;
 119
 120         if (tctx->dhkey != NULL)
 121                 dst_key_free(&tctx->dhkey);
 122         if (tctx->domain != NULL) {
 123                 if (dns_name_dynamic(tctx->domain))
 124                         dns_name_free(tctx->domain, mctx);
 125                 isc_mem_put(mctx, tctx->domain, sizeof(dns_name_t));
 126         }
 127         if (tctx->gssapi_keytab != NULL) {
 128                 isc_mem_free(mctx, tctx->gssapi_keytab);
 129         }
 130         if (tctx->gsscred != NULL)
 131                 dst_gssapi_releasecred(&tctx->gsscred);
 132         isc_entropy_detach(&tctx->ectx);
 133         isc_mem_put(mctx, tctx, sizeof(dns_tkeyctx_t));
 134         isc_mem_detach(&mctx);
 135         *tctxp = NULL;
 136 }
 137
 138 static isc_result_t
 139 add_rdata_to_list(dns_message_t *msg, dns_name_t *name, dns_rdata_t *rdata,
 140                 isc_uint32_t ttl, dns_namelist_t *namelist)
 141 {
 142         isc_result_t result;
 143         isc_region_t r, newr;
 144         dns_rdata_t *newrdata = NULL;
 145         dns_name_t *newname = NULL;
 146         dns_rdatalist_t *newlist = NULL;
 147         dns_rdataset_t *newset = NULL;
 148         isc_buffer_t *tmprdatabuf = NULL;
 149
 150         RETERR(dns_message_gettemprdata(msg, &newrdata));
 151
 152         dns_rdata_toregion(rdata, &r);
 153         RETERR(isc_buffer_allocate(msg->mctx, &tmprdatabuf, r.length));
 154         isc_buffer_availableregion(tmprdatabuf, &newr);
 155         memmove(newr.base, r.base, r.length);
 156         dns_rdata_fromregion(newrdata, rdata->rdclass, rdata->type, &newr);
 157         dns_message_takebuffer(msg, &tmprdatabuf);
 158
 159         RETERR(dns_message_gettempname(msg, &newname));
 160         dns_name_init(newname, NULL);
 161         RETERR(dns_name_dup(name, msg->mctx, newname));
 162
 163         RETERR(dns_message_gettemprdatalist(msg, &newlist));
 164         newlist->rdclass = newrdata->rdclass;
 165         newlist->type = newrdata->type;
 166         newlist->covers = 0;
 167         newlist->ttl = ttl;
 168         ISC_LIST_INIT(newlist->rdata);
 169         ISC_LIST_APPEND(newlist->rdata, newrdata, link);
 170
 171         RETERR(dns_message_gettemprdataset(msg, &newset));
 172         dns_rdataset_init(newset);
 173         RETERR(dns_rdatalist_tordataset(newlist, newset));
 174
 175         ISC_LIST_INIT(newname->list);
 176         ISC_LIST_APPEND(newname->list, newset, link);
 177
 178         ISC_LIST_APPEND(*namelist, newname, link);
 179
 180         return (ISC_R_SUCCESS);
 181
 182  failure:
 183         if (newrdata != NULL) {
 184                 if (ISC_LINK_LINKED(newrdata, link)) {
 185                         INSIST(newlist != NULL);
 186                         ISC_LIST_UNLINK(newlist->rdata, newrdata, link);
 187                 }
 188                 dns_message_puttemprdata(msg, &newrdata);
 189         }
 190         if (newname != NULL)
 191                 dns_message_puttempname(msg, &newname);
 192         if (newset != NULL) {
 193                 dns_rdataset_disassociate(newset);
 194                 dns_message_puttemprdataset(msg, &newset);
 195         }
 196         if (newlist != NULL)
 197                 dns_message_puttemprdatalist(msg, &newlist);
 198         return (result);
 199 }
 200
 201 static void
 202 free_namelist(dns_message_t *msg, dns_namelist_t *namelist) {
 203         dns_name_t *name;
 204         dns_rdataset_t *set;
 205
 206         while (!ISC_LIST_EMPTY(*namelist)) {
 207                 name = ISC_LIST_HEAD(*namelist);
 208                 ISC_LIST_UNLINK(*namelist, name, link);
 209                 while (!ISC_LIST_EMPTY(name->list)) {
 210                         set = ISC_LIST_HEAD(name->list);
 211                         ISC_LIST_UNLINK(name->list, set, link);
 212                         dns_message_puttemprdataset(msg, &set);
 213                 }
 214                 dns_message_puttempname(msg, &name);
 215         }
 216 }
 217
 218 static isc_result_t
 219 compute_secret(isc_buffer_t *shared, isc_region_t *queryrandomness,
 220                isc_region_t *serverrandomness, isc_buffer_t *secret)
 221 {
 222         isc_md5_t md5ctx;
 223         isc_region_t r, r2;
 224         unsigned char digests[32];
 225         unsigned int i;
 226
 227         isc_buffer_usedregion(shared, &r);
 228
 229         /*
 230          * MD5 ( query data | DH value ).
 231          */
 232         isc_md5_init(&md5ctx);
 233         isc_md5_update(&md5ctx, queryrandomness->base,
 234                        queryrandomness->length);
 235         isc_md5_update(&md5ctx, r.base, r.length);
 236         isc_md5_final(&md5ctx, digests);
 237
 238         /*
 239          * MD5 ( server data | DH value ).
 240          */
 241         isc_md5_init(&md5ctx);
 242         isc_md5_update(&md5ctx, serverrandomness->base,
 243                        serverrandomness->length);
 244         isc_md5_update(&md5ctx, r.base, r.length);
 245         isc_md5_final(&md5ctx, &digests[ISC_MD5_DIGESTLENGTH]);
 246
 247         /*
 248          * XOR ( DH value, MD5-1 | MD5-2).
 249          */
 250         isc_buffer_availableregion(secret, &r);
 251         isc_buffer_usedregion(shared, &r2);
 252         if (r.length < sizeof(digests) || r.length < r2.length)
 253                 return (ISC_R_NOSPACE);
 254         if (r2.length > sizeof(digests)) {
 255                 memmove(r.base, r2.base, r2.length);
 256                 for (i = 0; i < sizeof(digests); i++)
 257                         r.base[i] ^= digests[i];
 258                 isc_buffer_add(secret, r2.length);
 259         } else {
 260                 memmove(r.base, digests, sizeof(digests));
 261                 for (i = 0; i < r2.length; i++)
 262                         r.base[i] ^= r2.base[i];
 263                 isc_buffer_add(secret, sizeof(digests));
 264         }
 265         return (ISC_R_SUCCESS);
 266
 267 }
 268
 269 static isc_result_t
 270 process_dhtkey(dns_message_t *msg, dns_name_t *signer, dns_name_t *name,
 271                dns_rdata_tkey_t *tkeyin, dns_tkeyctx_t *tctx,
 272                dns_rdata_tkey_t *tkeyout,
 273                dns_tsig_keyring_t *ring, dns_namelist_t *namelist)
 274 {
 275         isc_result_t result = ISC_R_SUCCESS;
 276         dns_name_t *keyname, ourname;
 277         dns_rdataset_t *keyset = NULL;
 278         dns_rdata_t keyrdata = DNS_RDATA_INIT, ourkeyrdata = DNS_RDATA_INIT;
 279         isc_boolean_t found_key = ISC_FALSE, found_incompatible = ISC_FALSE;
 280         dst_key_t *pubkey = NULL;
 281         isc_buffer_t ourkeybuf, *shared = NULL;
 282         isc_region_t r, r2, ourkeyr;
 283         unsigned char keydata[DST_KEY_MAXSIZE];
 284         unsigned int sharedsize;
 285         isc_buffer_t secret;
 286         unsigned char *randomdata = NULL, secretdata[256];
 287         dns_ttl_t ttl = 0;
 288
 289         if (tctx->dhkey == NULL) {
 290                 tkey_log("process_dhtkey: tkey-dhkey not defined");
 291                 tkeyout->error = dns_tsigerror_badalg;
 292                 return (DNS_R_REFUSED);
 293         }
 294
 295         if (!dns_name_equal(&tkeyin->algorithm, DNS_TSIG_HMACMD5_NAME)) {
 296                 tkey_log("process_dhtkey: algorithms other than "
 297                          "hmac-md5 are not supported");
 298                 tkeyout->error = dns_tsigerror_badalg;
 299                 return (ISC_R_SUCCESS);
 300         }
 301
 302         /*
 303          * Look for a DH KEY record that will work with ours.
 304          */
 305         for (result = dns_message_firstname(msg, DNS_SECTION_ADDITIONAL);
 306              result == ISC_R_SUCCESS && !found_key;
 307              result = dns_message_nextname(msg, DNS_SECTION_ADDITIONAL)) {
 308                 keyname = NULL;
 309                 dns_message_currentname(msg, DNS_SECTION_ADDITIONAL, &keyname);
 310                 keyset = NULL;
 311                 result = dns_message_findtype(keyname, dns_rdatatype_key, 0,
 312                                               &keyset);
 313                 if (result != ISC_R_SUCCESS)
 314                         continue;
 315
 316                 for (result = dns_rdataset_first(keyset);
 317                      result == ISC_R_SUCCESS && !found_key;
 318                      result = dns_rdataset_next(keyset)) {
 319                         dns_rdataset_current(keyset, &keyrdata);
 320                         pubkey = NULL;
 321                         result = dns_dnssec_keyfromrdata(keyname, &keyrdata,
 322                                                          msg->mctx, &pubkey);
 323                         if (result != ISC_R_SUCCESS) {
 324                                 dns_rdata_reset(&keyrdata);
 325                                 continue;
 326                         }
 327                         if (dst_key_alg(pubkey) == DNS_KEYALG_DH) {
 328                                 if (dst_key_paramcompare(pubkey, tctx->dhkey))
 329                                 {
 330                                         found_key = ISC_TRUE;
 331                                         ttl = keyset->ttl;
 332                                         break;
 333                                 } else
 334                                         found_incompatible = ISC_TRUE;
 335                         }
 336                         dst_key_free(&pubkey);
 337                         dns_rdata_reset(&keyrdata);
 338                 }
 339         }
 340
 341         if (!found_key) {
 342                 if (found_incompatible) {
 343                         tkey_log("process_dhtkey: found an incompatible key");
 344                         tkeyout->error = dns_tsigerror_badkey;
 345                         return (ISC_R_SUCCESS);
 346                 } else {
 347                         tkey_log("process_dhtkey: failed to find a key");
 348                         return (DNS_R_FORMERR);
 349                 }
 350         }
 351
 352         RETERR(add_rdata_to_list(msg, keyname, &keyrdata, ttl, namelist));
 353
 354         isc_buffer_init(&ourkeybuf, keydata, sizeof(keydata));
 355         RETERR(dst_key_todns(tctx->dhkey, &ourkeybuf));
 356         isc_buffer_usedregion(&ourkeybuf, &ourkeyr);
 357         dns_rdata_fromregion(&ourkeyrdata, dns_rdataclass_any,
 358                              dns_rdatatype_key, &ourkeyr);
 359
 360         dns_name_init(&ourname, NULL);
 361         dns_name_clone(dst_key_name(tctx->dhkey), &ourname);
 362
 363         /*
 364          * XXXBEW The TTL should be obtained from the database, if it exists.
 365          */
 366         RETERR(add_rdata_to_list(msg, &ourname, &ourkeyrdata, 0, namelist));
 367
 368         RETERR(dst_key_secretsize(tctx->dhkey, &sharedsize));
 369         RETERR(isc_buffer_allocate(msg->mctx, &shared, sharedsize));
 370
 371         result = dst_key_computesecret(pubkey, tctx->dhkey, shared);
 372         if (result != ISC_R_SUCCESS) {
 373                 tkey_log("process_dhtkey: failed to compute shared secret: %s",
 374                          isc_result_totext(result));
 375                 goto failure;
 376         }
 377         dst_key_free(&pubkey);
 378
 379         isc_buffer_init(&secret, secretdata, sizeof(secretdata));
 380
 381         randomdata = isc_mem_get(tkeyout->mctx, TKEY_RANDOM_AMOUNT);
 382         if (randomdata == NULL)
 383                 goto failure;
 384
 385         result = isc_entropy_getdata(tctx->ectx, randomdata,
 386                                      TKEY_RANDOM_AMOUNT, NULL, 0);
 387         if (result != ISC_R_SUCCESS) {
 388                 tkey_log("process_dhtkey: failed to obtain entropy: %s",
 389                          isc_result_totext(result));
 390                 goto failure;
 391         }
 392
 393         r.base = randomdata;
 394         r.length = TKEY_RANDOM_AMOUNT;
 395         r2.base = tkeyin->key;
 396         r2.length = tkeyin->keylen;
 397         RETERR(compute_secret(shared, &r2, &r, &secret));
 398         isc_buffer_free(&shared);
 399
 400         RETERR(dns_tsigkey_create(name, &tkeyin->algorithm,
 401                                   isc_buffer_base(&secret),
 402                                   isc_buffer_usedlength(&secret),
 403                                   ISC_TRUE, signer, tkeyin->inception,
 404                                   tkeyin->expire, ring->mctx, ring, NULL));
 405
 406         /* This key is good for a long time */
 407         tkeyout->inception = tkeyin->inception;
 408         tkeyout->expire = tkeyin->expire;
 409
 410         tkeyout->key = randomdata;
 411         tkeyout->keylen = TKEY_RANDOM_AMOUNT;
 412
 413         return (ISC_R_SUCCESS);
 414
 415  failure:
 416         if (!ISC_LIST_EMPTY(*namelist))
 417                 free_namelist(msg, namelist);
 418         if (shared != NULL)
 419                 isc_buffer_free(&shared);
 420         if (pubkey != NULL)
 421                 dst_key_free(&pubkey);
 422         if (randomdata != NULL)
 423                 isc_mem_put(tkeyout->mctx, randomdata, TKEY_RANDOM_AMOUNT);
 424         return (result);
 425 }
 426
 427 static isc_result_t
 428 process_gsstkey(dns_name_t *name, dns_rdata_tkey_t *tkeyin,
 429                 dns_tkeyctx_t *tctx, dns_rdata_tkey_t *tkeyout,
 430                 dns_tsig_keyring_t *ring)
 431 {
 432         isc_result_t result = ISC_R_SUCCESS;
 433         dst_key_t *dstkey = NULL;
 434         dns_tsigkey_t *tsigkey = NULL;
 435         dns_fixedname_t principal;
 436         isc_stdtime_t now;
 437         isc_region_t intoken;
 438         isc_buffer_t *outtoken = NULL;
 439         gss_ctx_id_t gss_ctx = NULL;
 440
 441         /*
 442          * You have to define either a gss credential (principal) to
 443          * accept with tkey-gssapi-credential, or you have to
 444          * configure a specific keytab (with tkey-gssapi-keytab) in
 445          * order to use gsstkey
 446          */
 447         if (tctx->gsscred == NULL && tctx->gssapi_keytab == NULL) {
 448                 tkey_log("process_gsstkey(): no tkey-gssapi-credential "
 449                          "or tkey-gssapi-keytab configured");
 450                 return (ISC_R_NOPERM);
 451         }
 452
 453         if (!dns_name_equal(&tkeyin->algorithm, DNS_TSIG_GSSAPI_NAME) &&
 454             !dns_name_equal(&tkeyin->algorithm, DNS_TSIG_GSSAPIMS_NAME)) {
 455                 tkeyout->error = dns_tsigerror_badalg;
 456                 tkey_log("process_gsstkey(): dns_tsigerror_badalg");    /* XXXSRA */
 457                 return (ISC_R_SUCCESS);
 458         }
 459
 460         /*
 461          * XXXDCL need to check for key expiry per 4.1.1
 462          * XXXDCL need a way to check fully established, perhaps w/key_flags
 463          */
 464
 465         intoken.base = tkeyin->key;
 466         intoken.length = tkeyin->keylen;
 467
 468         result = dns_tsigkey_find(&tsigkey, name, &tkeyin->algorithm, ring);
 469         if (result == ISC_R_SUCCESS)
 470                 gss_ctx = dst_key_getgssctx(tsigkey->key);
 471
 472         dns_fixedname_init(&principal);
 473
 474         /*
 475          * Note that tctx->gsscred may be NULL if tctx->gssapi_keytab is set
 476          */
 477         result = dst_gssapi_acceptctx(tctx->gsscred, tctx->gssapi_keytab,
 478                                       &intoken,
 479                                       &outtoken, &gss_ctx,
 480                                       dns_fixedname_name(&principal),
 481                                       tctx->mctx);
 482         if (result == DNS_R_INVALIDTKEY) {
 483                 if (tsigkey != NULL)
 484                         dns_tsigkey_detach(&tsigkey);
 485                 tkeyout->error = dns_tsigerror_badkey;
 486                 tkey_log("process_gsstkey(): dns_tsigerror_badkey");    /* XXXSRA */
 487                 return (ISC_R_SUCCESS);
 488         }
 489         if (result != DNS_R_CONTINUE && result != ISC_R_SUCCESS)
 490                 goto failure;
 491         /*
 492          * XXXDCL Section 4.1.3: Limit GSS_S_CONTINUE_NEEDED to 10 times.
 493          */
 494
 495         isc_stdtime_get(&now);
 496
 497         if (tsigkey == NULL) {
 498 #ifdef GSSAPI
 499                 OM_uint32 gret, minor, lifetime;
 500 #endif
 501                 isc_uint32_t expire;
 502
 503                 RETERR(dst_key_fromgssapi(name, gss_ctx, ring->mctx,
 504                                           &dstkey, &intoken));
 505                 /*
 506                  * Limit keys to 1 hour or the context's lifetime whichever
 507                  * is smaller.
 508                  */
 509                 expire = now + 3600;
 510 #ifdef GSSAPI
 511                 gret = gss_context_time(&minor, gss_ctx, &lifetime);
 512                 if (gret == GSS_S_COMPLETE && now + lifetime < expire)
 513                         expire = now + lifetime;
 514 #endif
 515                 RETERR(dns_tsigkey_createfromkey(name, &tkeyin->algorithm,
 516                                                  dstkey, ISC_TRUE,
 517                                                  dns_fixedname_name(&principal),
 518                                                  now, expire, ring->mctx, ring,
 519                                                  NULL));
 520                 dst_key_free(&dstkey);
 521                 tkeyout->inception = now;
 522                 tkeyout->expire = expire;
 523         } else {
 524                 tkeyout->inception = tsigkey->inception;
 525                 tkeyout->expire = tsigkey->expire;
 526                 dns_tsigkey_detach(&tsigkey);
 527         }
 528
 529         if (outtoken) {
 530                 tkeyout->key = isc_mem_get(tkeyout->mctx,
 531                                            isc_buffer_usedlength(outtoken));
 532                 if (tkeyout->key == NULL) {
 533                         result = ISC_R_NOMEMORY;
 534                         goto failure;
 535                 }
 536                 tkeyout->keylen = isc_buffer_usedlength(outtoken);
 537                 memmove(tkeyout->key, isc_buffer_base(outtoken),
 538                        isc_buffer_usedlength(outtoken));
 539                 isc_buffer_free(&outtoken);
 540         } else {
 541                 tkeyout->key = isc_mem_get(tkeyout->mctx, tkeyin->keylen);
 542                 if (tkeyout->key == NULL) {
 543                         result = ISC_R_NOMEMORY;
 544                         goto failure;
 545                 }
 546                 tkeyout->keylen = tkeyin->keylen;
 547                 memmove(tkeyout->key, tkeyin->key, tkeyin->keylen);
 548         }
 549
 550         tkeyout->error = dns_rcode_noerror;
 551
 552         tkey_log("process_gsstkey(): dns_tsigerror_noerror");   /* XXXSRA */
 553
 554         return (ISC_R_SUCCESS);
 555
 556 failure:
 557         if (tsigkey != NULL)
 558                 dns_tsigkey_detach(&tsigkey);
 559
 560         if (dstkey != NULL)
 561                 dst_key_free(&dstkey);
 562
 563         if (outtoken != NULL)
 564                 isc_buffer_free(&outtoken);
 565
 566         tkey_log("process_gsstkey(): %s",
 567                 isc_result_totext(result));     /* XXXSRA */
 568
 569         return (result);
 570 }
 571
 572 static isc_result_t
 573 process_deletetkey(dns_name_t *signer, dns_name_t *name,
 574                    dns_rdata_tkey_t *tkeyin, dns_rdata_tkey_t *tkeyout,
 575                    dns_tsig_keyring_t *ring)
 576 {
 577         isc_result_t result;
 578         dns_tsigkey_t *tsigkey = NULL;
 579         dns_name_t *identity;
 580
 581         result = dns_tsigkey_find(&tsigkey, name, &tkeyin->algorithm, ring);
 582         if (result != ISC_R_SUCCESS) {
 583                 tkeyout->error = dns_tsigerror_badname;
 584                 return (ISC_R_SUCCESS);
 585         }
 586
 587         /*
 588          * Only allow a delete if the identity that created the key is the
 589          * same as the identity that signed the message.
 590          */
 591         identity = dns_tsigkey_identity(tsigkey);
 592         if (identity == NULL || !dns_name_equal(identity, signer)) {
 593                 dns_tsigkey_detach(&tsigkey);
 594                 return (DNS_R_REFUSED);
 595         }
 596
 597         /*
 598          * Set the key to be deleted when no references are left.  If the key
 599          * was not generated with TKEY and is in the config file, it may be
 600          * reloaded later.
 601          */
 602         dns_tsigkey_setdeleted(tsigkey);
 603
 604         /* Release the reference */
 605         dns_tsigkey_detach(&tsigkey);
 606
 607         return (ISC_R_SUCCESS);
 608 }
 609
 610 isc_result_t
 611 dns_tkey_processquery(dns_message_t *msg, dns_tkeyctx_t *tctx,
 612                       dns_tsig_keyring_t *ring)
 613 {
 614         isc_result_t result = ISC_R_SUCCESS;
 615         dns_rdata_tkey_t tkeyin, tkeyout;
 616         isc_boolean_t freetkeyin = ISC_FALSE;
 617         dns_name_t *qname, *name, *keyname, *signer, tsigner;
 618         dns_fixedname_t fkeyname;
 619         dns_rdataset_t *tkeyset;
 620         dns_rdata_t rdata;
 621         dns_namelist_t namelist;
 622         char tkeyoutdata[512];
 623         isc_buffer_t tkeyoutbuf;
 624
 625         REQUIRE(msg != NULL);
 626         REQUIRE(tctx != NULL);
 627         REQUIRE(ring != NULL);
 628
 629         ISC_LIST_INIT(namelist);
 630
 631         /*
 632          * Interpret the question section.
 633          */
 634         result = dns_message_firstname(msg, DNS_SECTION_QUESTION);
 635         if (result != ISC_R_SUCCESS)
 636                 return (DNS_R_FORMERR);
 637
 638         qname = NULL;
 639         dns_message_currentname(msg, DNS_SECTION_QUESTION, &qname);
 640
 641         /*
 642          * Look for a TKEY record that matches the question.
 643          */
 644         tkeyset = NULL;
 645         name = NULL;
 646         result = dns_message_findname(msg, DNS_SECTION_ADDITIONAL, qname,
 647                                       dns_rdatatype_tkey, 0, &name, &tkeyset);
 648         if (result != ISC_R_SUCCESS) {
 649                 /*
 650                  * Try the answer section, since that's where Win2000
 651                  * puts it.
 652                  */
 653                 name = NULL;
 654                 if (dns_message_findname(msg, DNS_SECTION_ANSWER, qname,
 655                                          dns_rdatatype_tkey, 0, &name,
 656                                          &tkeyset) != ISC_R_SUCCESS) {
 657                         result = DNS_R_FORMERR;
 658                         tkey_log("dns_tkey_processquery: couldn't find a TKEY "
 659                                  "matching the question");
 660                         goto failure;
 661                 }
 662         }
 663         result = dns_rdataset_first(tkeyset);
 664         if (result != ISC_R_SUCCESS) {
 665                 result = DNS_R_FORMERR;
 666                 goto failure;
 667         }
 668         dns_rdata_init(&rdata);
 669         dns_rdataset_current(tkeyset, &rdata);
 670
 671         RETERR(dns_rdata_tostruct(&rdata, &tkeyin, NULL));
 672         freetkeyin = ISC_TRUE;
 673
 674         if (tkeyin.error != dns_rcode_noerror) {
 675                 result = DNS_R_FORMERR;
 676                 goto failure;
 677         }
 678
 679         /*
 680          * Before we go any farther, verify that the message was signed.
 681          * GSSAPI TKEY doesn't require a signature, the rest do.
 682          */
 683         dns_name_init(&tsigner, NULL);
 684         result = dns_message_signer(msg, &tsigner);
 685         if (result != ISC_R_SUCCESS) {
 686                 if (tkeyin.mode == DNS_TKEYMODE_GSSAPI &&
 687                     result == ISC_R_NOTFOUND)
 688                        signer = NULL;
 689                 else {
 690                         tkey_log("dns_tkey_processquery: query was not "
 691                                  "properly signed - rejecting");
 692                         result = DNS_R_FORMERR;
 693                         goto failure;
 694                 }
 695         } else
 696                 signer = &tsigner;
 697
 698         tkeyout.common.rdclass = tkeyin.common.rdclass;
 699         tkeyout.common.rdtype = tkeyin.common.rdtype;
 700         ISC_LINK_INIT(&tkeyout.common, link);
 701         tkeyout.mctx = msg->mctx;
 702
 703         dns_name_init(&tkeyout.algorithm, NULL);
 704         dns_name_clone(&tkeyin.algorithm, &tkeyout.algorithm);
 705
 706         tkeyout.inception = tkeyout.expire = 0;
 707         tkeyout.mode = tkeyin.mode;
 708         tkeyout.error = 0;
 709         tkeyout.keylen = tkeyout.otherlen = 0;
 710         tkeyout.key = tkeyout.other = NULL;
 711
 712         /*
 713          * A delete operation must have a fully specified key name.  If this
 714          * is not a delete, we do the following:
 715          * if (qname != ".")
 716          *      keyname = qname + defaultdomain
 717          * else
 718          *      keyname = <random hex> + defaultdomain
 719          */
 720         if (tkeyin.mode != DNS_TKEYMODE_DELETE) {
 721                 dns_tsigkey_t *tsigkey = NULL;
 722
 723                 if (tctx->domain == NULL && tkeyin.mode != DNS_TKEYMODE_GSSAPI) {
 724                         tkey_log("dns_tkey_processquery: tkey-domain not set");
 725                         result = DNS_R_REFUSED;
 726                         goto failure;
 727                 }
 728
 729                 dns_fixedname_init(&fkeyname);
 730                 keyname = dns_fixedname_name(&fkeyname);
 731
 732                 if (!dns_name_equal(qname, dns_rootname)) {
 733                         unsigned int n = dns_name_countlabels(qname);
 734                         RUNTIME_CHECK(dns_name_copy(qname, keyname, NULL)
 735                                       == ISC_R_SUCCESS);
 736                         dns_name_getlabelsequence(keyname, 0, n - 1, keyname);
 737                 } else {
 738                         static char hexdigits[16] = {
 739                                 '0', '1', '2', '3', '4', '5', '6', '7',
 740                                 '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
 741                         unsigned char randomdata[16];
 742                         char randomtext[32];
 743                         isc_buffer_t b;
 744                         unsigned int i, j;
 745
 746                         result = isc_entropy_getdata(tctx->ectx,
 747                                                      randomdata,
 748                                                      sizeof(randomdata),
 749                                                      NULL, 0);
 750                         if (result != ISC_R_SUCCESS)
 751                                 goto failure;
 752
 753                         for (i = 0, j = 0; i < sizeof(randomdata); i++) {
 754                                 unsigned char val = randomdata[i];
 755                                 randomtext[j++] = hexdigits[val >> 4];
 756                                 randomtext[j++] = hexdigits[val & 0xF];
 757                         }
 758                         isc_buffer_init(&b, randomtext, sizeof(randomtext));
 759                         isc_buffer_add(&b, sizeof(randomtext));
 760                         result = dns_name_fromtext(keyname, &b, NULL, 0, NULL);
 761                         if (result != ISC_R_SUCCESS)
 762                                 goto failure;
 763                 }
 764
 765                 if (tkeyin.mode == DNS_TKEYMODE_GSSAPI) {
 766                         /* Yup.  This is a hack */
 767                         result = dns_name_concatenate(keyname, dns_rootname,
 768                                                       keyname, NULL);
 769                         if (result != ISC_R_SUCCESS)
 770                                 goto failure;
 771                 } else {
 772                         result = dns_name_concatenate(keyname, tctx->domain,
 773                                                       keyname, NULL);
 774                         if (result != ISC_R_SUCCESS)
 775                                 goto failure;
 776                 }
 777
 778                 result = dns_tsigkey_find(&tsigkey, keyname, NULL, ring);
 779
 780                 if (result == ISC_R_SUCCESS) {
 781                         tkeyout.error = dns_tsigerror_badname;
 782                         dns_tsigkey_detach(&tsigkey);
 783                         goto failure_with_tkey;
 784                 } else if (result != ISC_R_NOTFOUND)
 785                         goto failure;
 786         } else
 787                 keyname = qname;
 788
 789         switch (tkeyin.mode) {
 790                 case DNS_TKEYMODE_DIFFIEHELLMAN:
 791                         tkeyout.error = dns_rcode_noerror;
 792                         RETERR(process_dhtkey(msg, signer, keyname, &tkeyin,
 793                                               tctx, &tkeyout, ring,
 794                                               &namelist));
 795                         break;
 796                 case DNS_TKEYMODE_GSSAPI:
 797                         tkeyout.error = dns_rcode_noerror;
 798                         RETERR(process_gsstkey(keyname, &tkeyin, tctx,
 799                                                &tkeyout, ring));
 800                         break;
 801                 case DNS_TKEYMODE_DELETE:
 802                         tkeyout.error = dns_rcode_noerror;
 803                         RETERR(process_deletetkey(signer, keyname, &tkeyin,
 804                                                   &tkeyout, ring));
 805                         break;
 806                 case DNS_TKEYMODE_SERVERASSIGNED:
 807                 case DNS_TKEYMODE_RESOLVERASSIGNED:
 808                         result = DNS_R_NOTIMP;
 809                         goto failure;
 810                 default:
 811                         tkeyout.error = dns_tsigerror_badmode;
 812         }
 813
 814  failure_with_tkey:
 815         dns_rdata_init(&rdata);
 816         isc_buffer_init(&tkeyoutbuf, tkeyoutdata, sizeof(tkeyoutdata));
 817         result = dns_rdata_fromstruct(&rdata, tkeyout.common.rdclass,
 818                                       tkeyout.common.rdtype, &tkeyout,
 819                                       &tkeyoutbuf);
 820
 821         if (freetkeyin) {
 822                 dns_rdata_freestruct(&tkeyin);
 823                 freetkeyin = ISC_FALSE;
 824         }
 825
 826         if (tkeyout.key != NULL)
 827                 isc_mem_put(tkeyout.mctx, tkeyout.key, tkeyout.keylen);
 828         if (tkeyout.other != NULL)
 829                 isc_mem_put(tkeyout.mctx, tkeyout.other, tkeyout.otherlen);
 830         if (result != ISC_R_SUCCESS)
 831                 goto failure;
 832
 833         RETERR(add_rdata_to_list(msg, keyname, &rdata, 0, &namelist));
 834
 835         RETERR(dns_message_reply(msg, ISC_TRUE));
 836
 837         name = ISC_LIST_HEAD(namelist);
 838         while (name != NULL) {
 839                 dns_name_t *next = ISC_LIST_NEXT(name, link);
 840                 ISC_LIST_UNLINK(namelist, name, link);
 841                 dns_message_addname(msg, name, DNS_SECTION_ANSWER);
 842                 name = next;
 843         }
 844
 845         return (ISC_R_SUCCESS);
 846
 847  failure:
 848         if (freetkeyin)
 849                 dns_rdata_freestruct(&tkeyin);
 850         if (!ISC_LIST_EMPTY(namelist))
 851                 free_namelist(msg, &namelist);
 852         return (result);
 853 }
 854
 855 static isc_result_t
 856 buildquery(dns_message_t *msg, dns_name_t *name,
 857            dns_rdata_tkey_t *tkey, isc_boolean_t win2k)
 858 {
 859         dns_name_t *qname = NULL, *aname = NULL;
 860         dns_rdataset_t *question = NULL, *tkeyset = NULL;
 861         dns_rdatalist_t *tkeylist = NULL;
 862         dns_rdata_t *rdata = NULL;
 863         isc_buffer_t *dynbuf = NULL;
 864         isc_result_t result;
 865
 866         REQUIRE(msg != NULL);
 867         REQUIRE(name != NULL);
 868         REQUIRE(tkey != NULL);
 869
 870         RETERR(dns_message_gettempname(msg, &qname));
 871         RETERR(dns_message_gettempname(msg, &aname));
 872
 873         RETERR(dns_message_gettemprdataset(msg, &question));
 874         dns_rdataset_init(question);
 875         dns_rdataset_makequestion(question, dns_rdataclass_any,
 876                                   dns_rdatatype_tkey);
 877
 878         RETERR(isc_buffer_allocate(msg->mctx, &dynbuf, 4096));
 879         RETERR(dns_message_gettemprdata(msg, &rdata));
 880
 881         RETERR(dns_rdata_fromstruct(rdata, dns_rdataclass_any,
 882                                     dns_rdatatype_tkey, tkey, dynbuf));
 883         dns_message_takebuffer(msg, &dynbuf);
 884
 885         RETERR(dns_message_gettemprdatalist(msg, &tkeylist));
 886         tkeylist->rdclass = dns_rdataclass_any;
 887         tkeylist->type = dns_rdatatype_tkey;
 888         tkeylist->covers = 0;
 889         tkeylist->ttl = 0;
 890         ISC_LIST_INIT(tkeylist->rdata);
 891         ISC_LIST_APPEND(tkeylist->rdata, rdata, link);
 892
 893         RETERR(dns_message_gettemprdataset(msg, &tkeyset));
 894         dns_rdataset_init(tkeyset);
 895         RETERR(dns_rdatalist_tordataset(tkeylist, tkeyset));
 896
 897         dns_name_init(qname, NULL);
 898         dns_name_clone(name, qname);
 899
 900         dns_name_init(aname, NULL);
 901         dns_name_clone(name, aname);
 902
 903         ISC_LIST_APPEND(qname->list, question, link);
 904         ISC_LIST_APPEND(aname->list, tkeyset, link);
 905
 906         dns_message_addname(msg, qname, DNS_SECTION_QUESTION);
 907
 908         /*
 909          * Windows 2000 needs this in the answer section, not the additional
 910          * section where the RFC specifies.
 911          */
 912         if (win2k)
 913                 dns_message_addname(msg, aname, DNS_SECTION_ANSWER);
 914         else
 915                 dns_message_addname(msg, aname, DNS_SECTION_ADDITIONAL);
 916
 917         return (ISC_R_SUCCESS);
 918
 919  failure:
 920         if (qname != NULL)
 921                 dns_message_puttempname(msg, &qname);
 922         if (aname != NULL)
 923                 dns_message_puttempname(msg, &aname);
 924         if (question != NULL) {
 925                 dns_rdataset_disassociate(question);
 926                 dns_message_puttemprdataset(msg, &question);
 927         }
 928         if (dynbuf != NULL)
 929                 isc_buffer_free(&dynbuf);
 930         printf("buildquery error\n");
 931         return (result);
 932 }
 933
 934 isc_result_t
 935 dns_tkey_builddhquery(dns_message_t *msg, dst_key_t *key, dns_name_t *name,
 936                       dns_name_t *algorithm, isc_buffer_t *nonce,
 937                       isc_uint32_t lifetime)
 938 {
 939         dns_rdata_tkey_t tkey;
 940         dns_rdata_t *rdata = NULL;
 941         isc_buffer_t *dynbuf = NULL;
 942         isc_region_t r;
 943         dns_name_t keyname;
 944         dns_namelist_t namelist;
 945         isc_result_t result;
 946         isc_stdtime_t now;
 947
 948         REQUIRE(msg != NULL);
 949         REQUIRE(key != NULL);
 950         REQUIRE(dst_key_alg(key) == DNS_KEYALG_DH);
 951         REQUIRE(dst_key_isprivate(key));
 952         REQUIRE(name != NULL);
 953         REQUIRE(algorithm != NULL);
 954
 955         tkey.common.rdclass = dns_rdataclass_any;
 956         tkey.common.rdtype = dns_rdatatype_tkey;
 957         ISC_LINK_INIT(&tkey.common, link);
 958         tkey.mctx = msg->mctx;
 959         dns_name_init(&tkey.algorithm, NULL);
 960         dns_name_clone(algorithm, &tkey.algorithm);
 961         isc_stdtime_get(&now);
 962         tkey.inception = now;
 963         tkey.expire = now + lifetime;
 964         tkey.mode = DNS_TKEYMODE_DIFFIEHELLMAN;
 965         if (nonce != NULL)
 966                 isc_buffer_usedregion(nonce, &r);
 967         else {
 968                 r.base = isc_mem_get(msg->mctx, 0);
 969                 r.length = 0;
 970         }
 971         tkey.error = 0;
 972         tkey.key = r.base;
 973         tkey.keylen =  r.length;
 974         tkey.other = NULL;
 975         tkey.otherlen = 0;
 976
 977         RETERR(buildquery(msg, name, &tkey, ISC_FALSE));
 978
 979         if (nonce == NULL)
 980                 isc_mem_put(msg->mctx, r.base, 0);
 981
 982         RETERR(dns_message_gettemprdata(msg, &rdata));
 983         RETERR(isc_buffer_allocate(msg->mctx, &dynbuf, 1024));
 984         RETERR(dst_key_todns(key, dynbuf));
 985         isc_buffer_usedregion(dynbuf, &r);
 986         dns_rdata_fromregion(rdata, dns_rdataclass_any,
 987                              dns_rdatatype_key, &r);
 988         dns_message_takebuffer(msg, &dynbuf);
 989
 990         dns_name_init(&keyname, NULL);
 991         dns_name_clone(dst_key_name(key), &keyname);
 992
 993         ISC_LIST_INIT(namelist);
 994         RETERR(add_rdata_to_list(msg, &keyname, rdata, 0, &namelist));
 995         name = ISC_LIST_HEAD(namelist);
 996         while (name != NULL) {
 997                 dns_name_t *next = ISC_LIST_NEXT(name, link);
 998                 ISC_LIST_UNLINK(namelist, name, link);
 999                 dns_message_addname(msg, name, DNS_SECTION_ADDITIONAL);
1000                 name = next;
1001         }
1002
1003         return (ISC_R_SUCCESS);
1004
1005  failure:
1006
1007         if (dynbuf != NULL)
1008                 isc_buffer_free(&dynbuf);
1009         return (result);
1010 }
1011
1012 isc_result_t
1013 dns_tkey_buildgssquery(dns_message_t *msg, dns_name_t *name, dns_name_t *gname,
1014                        isc_buffer_t *intoken, isc_uint32_t lifetime,
1015                        gss_ctx_id_t *context, isc_boolean_t win2k,
1016                        isc_mem_t *mctx, char **err_message)
1017 {
1018         dns_rdata_tkey_t tkey;
1019         isc_result_t result;
1020         isc_stdtime_t now;
1021         isc_buffer_t token;
1022         unsigned char array[4096];
1023
1024         UNUSED(intoken);
1025
1026         REQUIRE(msg != NULL);
1027         REQUIRE(name != NULL);
1028         REQUIRE(gname != NULL);
1029         REQUIRE(context != NULL);
1030         REQUIRE(mctx != NULL);
1031
1032         isc_buffer_init(&token, array, sizeof(array));
1033         result = dst_gssapi_initctx(gname, NULL, &token, context,
1034                                     mctx, err_message);
1035         if (result != DNS_R_CONTINUE && result != ISC_R_SUCCESS)
1036                 return (result);
1037
1038         tkey.common.rdclass = dns_rdataclass_any;
1039         tkey.common.rdtype = dns_rdatatype_tkey;
1040         ISC_LINK_INIT(&tkey.common, link);
1041         tkey.mctx = NULL;
1042         dns_name_init(&tkey.algorithm, NULL);
1043
1044         if (win2k)
1045                 dns_name_clone(DNS_TSIG_GSSAPIMS_NAME, &tkey.algorithm);
1046         else
1047                 dns_name_clone(DNS_TSIG_GSSAPI_NAME, &tkey.algorithm);
1048
1049         isc_stdtime_get(&now);
1050         tkey.inception = now;
1051         tkey.expire = now + lifetime;
1052         tkey.mode = DNS_TKEYMODE_GSSAPI;
1053         tkey.error = 0;
1054         tkey.key = isc_buffer_base(&token);
1055         tkey.keylen = isc_buffer_usedlength(&token);
1056         tkey.other = NULL;
1057         tkey.otherlen = 0;
1058
1059         RETERR(buildquery(msg, name, &tkey, win2k));
1060
1061         return (ISC_R_SUCCESS);
1062
1063  failure:
1064         return (result);
1065 }
1066
1067 isc_result_t
1068 dns_tkey_builddeletequery(dns_message_t *msg, dns_tsigkey_t *key) {
1069         dns_rdata_tkey_t tkey;
1070
1071         REQUIRE(msg != NULL);
1072         REQUIRE(key != NULL);
1073
1074         tkey.common.rdclass = dns_rdataclass_any;
1075         tkey.common.rdtype = dns_rdatatype_tkey;
1076         ISC_LINK_INIT(&tkey.common, link);
1077         tkey.mctx = msg->mctx;
1078         dns_name_init(&tkey.algorithm, NULL);
1079         dns_name_clone(key->algorithm, &tkey.algorithm);
1080         tkey.inception = tkey.expire = 0;
1081         tkey.mode = DNS_TKEYMODE_DELETE;
1082         tkey.error = 0;
1083         tkey.keylen = tkey.otherlen = 0;
1084         tkey.key = tkey.other = NULL;
1085
1086         return (buildquery(msg, &key->name, &tkey, ISC_FALSE));
1087 }
1088
1089 static isc_result_t
1090 find_tkey(dns_message_t *msg, dns_name_t **name, dns_rdata_t *rdata,
1091           int section)
1092 {
1093         dns_rdataset_t *tkeyset;
1094         isc_result_t result;
1095
1096         result = dns_message_firstname(msg, section);
1097         while (result == ISC_R_SUCCESS) {
1098                 *name = NULL;
1099                 dns_message_currentname(msg, section, name);
1100                 tkeyset = NULL;
1101                 result = dns_message_findtype(*name, dns_rdatatype_tkey, 0,
1102                                               &tkeyset);
1103                 if (result == ISC_R_SUCCESS) {
1104                         result = dns_rdataset_first(tkeyset);
1105                         if (result != ISC_R_SUCCESS)
1106                                 return (result);
1107                         dns_rdataset_current(tkeyset, rdata);
1108                         return (ISC_R_SUCCESS);
1109                 }
1110                 result = dns_message_nextname(msg, section);
1111         }
1112         if (result == ISC_R_NOMORE)
1113                 return (ISC_R_NOTFOUND);
1114         return (result);
1115 }
1116
1117 isc_result_t
1118 dns_tkey_processdhresponse(dns_message_t *qmsg, dns_message_t *rmsg,
1119                            dst_key_t *key, isc_buffer_t *nonce,
1120                            dns_tsigkey_t **outkey, dns_tsig_keyring_t *ring)
1121 {
1122         dns_rdata_t qtkeyrdata = DNS_RDATA_INIT, rtkeyrdata = DNS_RDATA_INIT;
1123         dns_name_t keyname, *tkeyname, *theirkeyname, *ourkeyname, *tempname;
1124         dns_rdataset_t *theirkeyset = NULL, *ourkeyset = NULL;
1125         dns_rdata_t theirkeyrdata = DNS_RDATA_INIT;
1126         dst_key_t *theirkey = NULL;
1127         dns_rdata_tkey_t qtkey, rtkey;
1128         unsigned char secretdata[256];
1129         unsigned int sharedsize;
1130         isc_buffer_t *shared = NULL, secret;
1131         isc_region_t r, r2;
1132         isc_result_t result;
1133         isc_boolean_t freertkey = ISC_FALSE;
1134
1135         REQUIRE(qmsg != NULL);
1136         REQUIRE(rmsg != NULL);
1137         REQUIRE(key != NULL);
1138         REQUIRE(dst_key_alg(key) == DNS_KEYALG_DH);
1139         REQUIRE(dst_key_isprivate(key));
1140         if (outkey != NULL)
1141                 REQUIRE(*outkey == NULL);
1142
1143         if (rmsg->rcode != dns_rcode_noerror)
1144                 return (ISC_RESULTCLASS_DNSRCODE + rmsg->rcode);
1145         RETERR(find_tkey(rmsg, &tkeyname, &rtkeyrdata, DNS_SECTION_ANSWER));
1146         RETERR(dns_rdata_tostruct(&rtkeyrdata, &rtkey, NULL));
1147         freertkey = ISC_TRUE;
1148
1149         RETERR(find_tkey(qmsg, &tempname, &qtkeyrdata,
1150                          DNS_SECTION_ADDITIONAL));
1151         RETERR(dns_rdata_tostruct(&qtkeyrdata, &qtkey, NULL));
1152
1153         if (rtkey.error != dns_rcode_noerror ||
1154             rtkey.mode != DNS_TKEYMODE_DIFFIEHELLMAN ||
1155             rtkey.mode != qtkey.mode ||
1156             !dns_name_equal(&rtkey.algorithm, &qtkey.algorithm) ||
1157             rmsg->rcode != dns_rcode_noerror) {
1158                 tkey_log("dns_tkey_processdhresponse: tkey mode invalid "
1159                          "or error set(1)");
1160                 result = DNS_R_INVALIDTKEY;
1161                 dns_rdata_freestruct(&qtkey);
1162                 goto failure;
1163         }
1164
1165         dns_rdata_freestruct(&qtkey);
1166
1167         dns_name_init(&keyname, NULL);
1168         dns_name_clone(dst_key_name(key), &keyname);
1169
1170         ourkeyname = NULL;
1171         ourkeyset = NULL;
1172         RETERR(dns_message_findname(rmsg, DNS_SECTION_ANSWER, &keyname,
1173                                     dns_rdatatype_key, 0, &ourkeyname,
1174                                     &ourkeyset));
1175
1176         result = dns_message_firstname(rmsg, DNS_SECTION_ANSWER);
1177         while (result == ISC_R_SUCCESS) {
1178                 theirkeyname = NULL;
1179                 dns_message_currentname(rmsg, DNS_SECTION_ANSWER,
1180                                         &theirkeyname);
1181                 if (dns_name_equal(theirkeyname, ourkeyname))
1182                         goto next;
1183                 theirkeyset = NULL;
1184                 result = dns_message_findtype(theirkeyname, dns_rdatatype_key,
1185                                               0, &theirkeyset);
1186                 if (result == ISC_R_SUCCESS) {
1187                         RETERR(dns_rdataset_first(theirkeyset));
1188                         break;
1189                 }
1190  next:
1191                 result = dns_message_nextname(rmsg, DNS_SECTION_ANSWER);
1192         }
1193
1194         if (theirkeyset == NULL) {
1195                 tkey_log("dns_tkey_processdhresponse: failed to find server "
1196                          "key");
1197                 result = ISC_R_NOTFOUND;
1198                 goto failure;
1199         }
1200
1201         dns_rdataset_current(theirkeyset, &theirkeyrdata);
1202         RETERR(dns_dnssec_keyfromrdata(theirkeyname, &theirkeyrdata,
1203                                        rmsg->mctx, &theirkey));
1204
1205         RETERR(dst_key_secretsize(key, &sharedsize));
1206         RETERR(isc_buffer_allocate(rmsg->mctx, &shared, sharedsize));
1207
1208         RETERR(dst_key_computesecret(theirkey, key, shared));
1209
1210         isc_buffer_init(&secret, secretdata, sizeof(secretdata));
1211
1212         r.base = rtkey.key;
1213         r.length = rtkey.keylen;
1214         if (nonce != NULL)
1215                 isc_buffer_usedregion(nonce, &r2);
1216         else {
1217                 r2.base = isc_mem_get(rmsg->mctx, 0);
1218                 r2.length = 0;
1219         }
1220         RETERR(compute_secret(shared, &r2, &r, &secret));
1221         if (nonce == NULL)
1222                 isc_mem_put(rmsg->mctx, r2.base, 0);
1223
1224         isc_buffer_usedregion(&secret, &r);
1225         result = dns_tsigkey_create(tkeyname, &rtkey.algorithm,
1226                                     r.base, r.length, ISC_TRUE,
1227                                     NULL, rtkey.inception, rtkey.expire,
1228                                     rmsg->mctx, ring, outkey);
1229         isc_buffer_free(&shared);
1230         dns_rdata_freestruct(&rtkey);
1231         dst_key_free(&theirkey);
1232         return (result);
1233
1234  failure:
1235         if (shared != NULL)
1236                 isc_buffer_free(&shared);
1237
1238         if (theirkey != NULL)
1239                 dst_key_free(&theirkey);
1240
1241         if (freertkey)
1242                 dns_rdata_freestruct(&rtkey);
1243
1244         return (result);
1245 }
1246
1247 isc_result_t
1248 dns_tkey_processgssresponse(dns_message_t *qmsg, dns_message_t *rmsg,
1249                             dns_name_t *gname, gss_ctx_id_t *context,
1250                             isc_buffer_t *outtoken, dns_tsigkey_t **outkey,
1251                             dns_tsig_keyring_t *ring, char **err_message)
1252 {
1253         dns_rdata_t rtkeyrdata = DNS_RDATA_INIT, qtkeyrdata = DNS_RDATA_INIT;
1254         dns_name_t *tkeyname;
1255         dns_rdata_tkey_t rtkey, qtkey;
1256         dst_key_t *dstkey = NULL;
1257         isc_buffer_t intoken;
1258         isc_result_t result;
1259         unsigned char array[1024];
1260
1261         REQUIRE(outtoken != NULL);
1262         REQUIRE(qmsg != NULL);
1263         REQUIRE(rmsg != NULL);
1264         REQUIRE(gname != NULL);
1265         REQUIRE(ring != NULL);
1266         if (outkey != NULL)
1267                 REQUIRE(*outkey == NULL);
1268
1269         if (rmsg->rcode != dns_rcode_noerror)
1270                 return (ISC_RESULTCLASS_DNSRCODE + rmsg->rcode);
1271         RETERR(find_tkey(rmsg, &tkeyname, &rtkeyrdata, DNS_SECTION_ANSWER));
1272         RETERR(dns_rdata_tostruct(&rtkeyrdata, &rtkey, NULL));
1273
1274         /*
1275          * Win2k puts the item in the ANSWER section, while the RFC
1276          * specifies it should be in the ADDITIONAL section.  Check first
1277          * where it should be, and then where it may be.
1278          */
1279         result = find_tkey(qmsg, &tkeyname, &qtkeyrdata,
1280                            DNS_SECTION_ADDITIONAL);
1281         if (result == ISC_R_NOTFOUND)
1282                 result = find_tkey(qmsg, &tkeyname, &qtkeyrdata,
1283                                    DNS_SECTION_ANSWER);
1284         if (result != ISC_R_SUCCESS)
1285                 goto failure;
1286
1287         RETERR(dns_rdata_tostruct(&qtkeyrdata, &qtkey, NULL));
1288
1289         if (rtkey.error != dns_rcode_noerror ||
1290             rtkey.mode != DNS_TKEYMODE_GSSAPI ||
1291             !dns_name_equal(&rtkey.algorithm, &qtkey.algorithm)) {
1292                 tkey_log("dns_tkey_processgssresponse: tkey mode invalid "
1293                          "or error set(2) %d", rtkey.error);
1294                 _dns_tkey_dumpmessage(qmsg);
1295                 _dns_tkey_dumpmessage(rmsg);
1296                 result = DNS_R_INVALIDTKEY;
1297                 goto failure;
1298         }
1299
1300         isc_buffer_init(outtoken, array, sizeof(array));
1301         isc_buffer_init(&intoken, rtkey.key, rtkey.keylen);
1302         RETERR(dst_gssapi_initctx(gname, &intoken, outtoken, context,
1303                                   ring->mctx, err_message));
1304
1305         RETERR(dst_key_fromgssapi(dns_rootname, *context, rmsg->mctx,
1306                                   &dstkey, NULL));
1307
1308         RETERR(dns_tsigkey_createfromkey(tkeyname, DNS_TSIG_GSSAPI_NAME,
1309                                          dstkey, ISC_FALSE, NULL,
1310                                          rtkey.inception, rtkey.expire,
1311                                          ring->mctx, ring, outkey));
1312         dst_key_free(&dstkey);
1313         dns_rdata_freestruct(&rtkey);
1314         return (result);
1315
1316  failure:
1317         /*
1318          * XXXSRA This probably leaks memory from rtkey and qtkey.
1319          */
1320         if (dstkey != NULL)
1321                 dst_key_free(&dstkey);
1322         return (result);
1323 }
1324
1325 isc_result_t
1326 dns_tkey_processdeleteresponse(dns_message_t *qmsg, dns_message_t *rmsg,
1327                                dns_tsig_keyring_t *ring)
1328 {
1329         dns_rdata_t qtkeyrdata = DNS_RDATA_INIT, rtkeyrdata = DNS_RDATA_INIT;
1330         dns_name_t *tkeyname, *tempname;
1331         dns_rdata_tkey_t qtkey, rtkey;
1332         dns_tsigkey_t *tsigkey = NULL;
1333         isc_result_t result;
1334
1335         REQUIRE(qmsg != NULL);
1336         REQUIRE(rmsg != NULL);
1337
1338         if (rmsg->rcode != dns_rcode_noerror)
1339                 return(ISC_RESULTCLASS_DNSRCODE + rmsg->rcode);
1340
1341         RETERR(find_tkey(rmsg, &tkeyname, &rtkeyrdata, DNS_SECTION_ANSWER));
1342         RETERR(dns_rdata_tostruct(&rtkeyrdata, &rtkey, NULL));
1343
1344         RETERR(find_tkey(qmsg, &tempname, &qtkeyrdata,
1345                          DNS_SECTION_ADDITIONAL));
1346         RETERR(dns_rdata_tostruct(&qtkeyrdata, &qtkey, NULL));
1347
1348         if (rtkey.error != dns_rcode_noerror ||
1349             rtkey.mode != DNS_TKEYMODE_DELETE ||
1350             rtkey.mode != qtkey.mode ||
1351             !dns_name_equal(&rtkey.algorithm, &qtkey.algorithm) ||
1352             rmsg->rcode != dns_rcode_noerror) {
1353                 tkey_log("dns_tkey_processdeleteresponse: tkey mode invalid "
1354                          "or error set(3)");
1355                 result = DNS_R_INVALIDTKEY;
1356                 dns_rdata_freestruct(&qtkey);
1357                 dns_rdata_freestruct(&rtkey);
1358                 goto failure;
1359         }
1360
1361         dns_rdata_freestruct(&qtkey);
1362
1363         RETERR(dns_tsigkey_find(&tsigkey, tkeyname, &rtkey.algorithm, ring));
1364
1365         dns_rdata_freestruct(&rtkey);
1366
1367         /*
1368          * Mark the key as deleted.
1369          */
1370         dns_tsigkey_setdeleted(tsigkey);
1371         /*
1372          * Release the reference.
1373          */
1374         dns_tsigkey_detach(&tsigkey);
1375
1376  failure:
1377         return (result);
1378 }
1379
1380 isc_result_t
1381 dns_tkey_gssnegotiate(dns_message_t *qmsg, dns_message_t *rmsg,
1382                       dns_name_t *server, gss_ctx_id_t *context,
1383                       dns_tsigkey_t **outkey, dns_tsig_keyring_t *ring,
1384                       isc_boolean_t win2k, char **err_message)
1385 {
1386         dns_rdata_t rtkeyrdata = DNS_RDATA_INIT, qtkeyrdata = DNS_RDATA_INIT;
1387         dns_name_t *tkeyname;
1388         dns_rdata_tkey_t rtkey, qtkey;
1389         isc_buffer_t intoken, outtoken;
1390         dst_key_t *dstkey = NULL;
1391         isc_result_t result;
1392         unsigned char array[1024];
1393
1394         REQUIRE(qmsg != NULL);
1395         REQUIRE(rmsg != NULL);
1396         REQUIRE(server != NULL);
1397         if (outkey != NULL)
1398                 REQUIRE(*outkey == NULL);
1399
1400         if (rmsg->rcode != dns_rcode_noerror)
1401                 return (ISC_RESULTCLASS_DNSRCODE + rmsg->rcode);
1402
1403         RETERR(find_tkey(rmsg, &tkeyname, &rtkeyrdata, DNS_SECTION_ANSWER));
1404         RETERR(dns_rdata_tostruct(&rtkeyrdata, &rtkey, NULL));
1405
1406         if (win2k == ISC_TRUE)
1407                 RETERR(find_tkey(qmsg, &tkeyname, &qtkeyrdata,
1408                                  DNS_SECTION_ANSWER));
1409         else
1410                 RETERR(find_tkey(qmsg, &tkeyname, &qtkeyrdata,
1411                                  DNS_SECTION_ADDITIONAL));
1412
1413         RETERR(dns_rdata_tostruct(&qtkeyrdata, &qtkey, NULL));
1414
1415         if (rtkey.error != dns_rcode_noerror ||
1416             rtkey.mode != DNS_TKEYMODE_GSSAPI ||
1417             !dns_name_equal(&rtkey.algorithm, &qtkey.algorithm))
1418         {
1419                 tkey_log("dns_tkey_processdhresponse: tkey mode invalid "
1420                          "or error set(4)");
1421                 result = DNS_R_INVALIDTKEY;
1422                 goto failure;
1423         }
1424
1425         isc_buffer_init(&intoken, rtkey.key, rtkey.keylen);
1426         isc_buffer_init(&outtoken, array, sizeof(array));
1427
1428         result = dst_gssapi_initctx(server, &intoken, &outtoken, context,
1429                                     ring->mctx, err_message);
1430         if (result != DNS_R_CONTINUE && result != ISC_R_SUCCESS)
1431                 return (result);
1432
1433         RETERR(dst_key_fromgssapi(dns_rootname, *context, rmsg->mctx,
1434                                   &dstkey, NULL));
1435
1436         /*
1437          * XXXSRA This seems confused.  If we got CONTINUE from initctx,
1438          * the GSS negotiation hasn't completed yet, so we can't sign
1439          * anything yet.
1440          */
1441
1442         RETERR(dns_tsigkey_createfromkey(tkeyname,
1443                                          (win2k
1444                                           ? DNS_TSIG_GSSAPIMS_NAME
1445                                           : DNS_TSIG_GSSAPI_NAME),
1446                                          dstkey, ISC_TRUE, NULL,
1447                                          rtkey.inception, rtkey.expire,
1448                                          ring->mctx, ring, outkey));
1449         dst_key_free(&dstkey);
1450         dns_rdata_freestruct(&rtkey);
1451         return (result);
1452
1453  failure:
1454         /*
1455          * XXXSRA This probably leaks memory from qtkey.
1456          */
1457         dns_rdata_freestruct(&rtkey);
1458         if (dstkey != NULL)
1459                 dst_key_free(&dstkey);
1460         return (result);
1461 }