2 * Copyright (C) 2004 Internet Systems Consortium, Inc. ("ISC")
3 * Copyright (C) 1999-2001 Internet Software Consortium.
5 * Permission to use, copy, modify, and 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.
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.
19 * $Id: tkey.c,v 1.71.2.2 2004/03/09 06:11:09 marka Exp $
24 #include <isc/buffer.h>
25 #include <isc/entropy.h>
28 #include <isc/string.h>
31 #include <dns/dnssec.h>
32 #include <dns/fixedname.h>
33 #include <dns/keyvalues.h>
35 #include <dns/message.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>
46 #include <dst/gssapi.h>
48 #define TKEY_RANDOM_AMOUNT 16
50 #define RETERR(x) do { \
52 if (result != ISC_R_SUCCESS) \
57 tkey_log(const char *fmt, ...) ISC_FORMAT_PRINTF(1, 2);
60 tkey_log(const char *fmt, ...) {
64 isc_log_vwrite(dns_lctx, DNS_LOGCATEGORY_GENERAL,
65 DNS_LOGMODULE_REQUEST, ISC_LOG_DEBUG(4), fmt, ap);
70 dns_tkeyctx_create(isc_mem_t *mctx, isc_entropy_t *ectx, dns_tkeyctx_t **tctxp)
74 REQUIRE(mctx != NULL);
75 REQUIRE(ectx != NULL);
76 REQUIRE(tctxp != NULL && *tctxp == NULL);
78 tctx = isc_mem_get(mctx, sizeof(dns_tkeyctx_t));
80 return (ISC_R_NOMEMORY);
82 isc_mem_attach(mctx, &tctx->mctx);
84 isc_entropy_attach(ectx, &tctx->ectx);
90 return (ISC_R_SUCCESS);
94 dns_tkeyctx_destroy(dns_tkeyctx_t **tctxp) {
98 REQUIRE(tctxp != NULL && *tctxp != NULL);
103 if (tctx->dhkey != NULL)
104 dst_key_free(&tctx->dhkey);
105 if (tctx->domain != NULL) {
106 if (dns_name_dynamic(tctx->domain))
107 dns_name_free(tctx->domain, mctx);
108 isc_mem_put(mctx, tctx->domain, sizeof(dns_name_t));
110 isc_entropy_detach(&tctx->ectx);
111 isc_mem_put(mctx, tctx, sizeof(dns_tkeyctx_t));
112 isc_mem_detach(&mctx);
117 add_rdata_to_list(dns_message_t *msg, dns_name_t *name, dns_rdata_t *rdata,
118 isc_uint32_t ttl, dns_namelist_t *namelist)
121 isc_region_t r, newr;
122 dns_rdata_t *newrdata = NULL;
123 dns_name_t *newname = NULL;
124 dns_rdatalist_t *newlist = NULL;
125 dns_rdataset_t *newset = NULL;
126 isc_buffer_t *tmprdatabuf = NULL;
128 RETERR(dns_message_gettemprdata(msg, &newrdata));
130 dns_rdata_toregion(rdata, &r);
131 RETERR(isc_buffer_allocate(msg->mctx, &tmprdatabuf, r.length));
132 isc_buffer_availableregion(tmprdatabuf, &newr);
133 memcpy(newr.base, r.base, r.length);
134 dns_rdata_fromregion(newrdata, rdata->rdclass, rdata->type, &newr);
135 dns_message_takebuffer(msg, &tmprdatabuf);
137 RETERR(dns_message_gettempname(msg, &newname));
138 dns_name_init(newname, NULL);
139 RETERR(dns_name_dup(name, msg->mctx, newname));
141 RETERR(dns_message_gettemprdatalist(msg, &newlist));
142 newlist->rdclass = newrdata->rdclass;
143 newlist->type = newrdata->type;
146 ISC_LIST_INIT(newlist->rdata);
147 ISC_LIST_APPEND(newlist->rdata, newrdata, link);
149 RETERR(dns_message_gettemprdataset(msg, &newset));
150 dns_rdataset_init(newset);
151 RETERR(dns_rdatalist_tordataset(newlist, newset));
153 ISC_LIST_INIT(newname->list);
154 ISC_LIST_APPEND(newname->list, newset, link);
156 ISC_LIST_APPEND(*namelist, newname, link);
158 return (ISC_R_SUCCESS);
161 if (newrdata != NULL) {
162 if (ISC_LINK_LINKED(newrdata, link))
163 ISC_LIST_UNLINK(newlist->rdata, newrdata, link);
164 dns_message_puttemprdata(msg, &newrdata);
167 dns_message_puttempname(msg, &newname);
168 if (newset != NULL) {
169 dns_rdataset_disassociate(newset);
170 dns_message_puttemprdataset(msg, &newset);
173 dns_message_puttemprdatalist(msg, &newlist);
178 free_namelist(dns_message_t *msg, dns_namelist_t *namelist) {
182 while (!ISC_LIST_EMPTY(*namelist)) {
183 name = ISC_LIST_HEAD(*namelist);
184 ISC_LIST_UNLINK(*namelist, name, link);
185 while (!ISC_LIST_EMPTY(name->list)) {
186 set = ISC_LIST_HEAD(name->list);
187 ISC_LIST_UNLINK(name->list, set, link);
188 dns_message_puttemprdataset(msg, &set);
190 dns_message_puttempname(msg, &name);
195 compute_secret(isc_buffer_t *shared, isc_region_t *queryrandomness,
196 isc_region_t *serverrandomness, isc_buffer_t *secret)
200 unsigned char digests[32];
203 isc_buffer_usedregion(shared, &r);
206 * MD5 ( query data | DH value ).
208 isc_md5_init(&md5ctx);
209 isc_md5_update(&md5ctx, queryrandomness->base,
210 queryrandomness->length);
211 isc_md5_update(&md5ctx, r.base, r.length);
212 isc_md5_final(&md5ctx, digests);
215 * MD5 ( server data | DH value ).
217 isc_md5_init(&md5ctx);
218 isc_md5_update(&md5ctx, serverrandomness->base,
219 serverrandomness->length);
220 isc_md5_update(&md5ctx, r.base, r.length);
221 isc_md5_final(&md5ctx, &digests[ISC_MD5_DIGESTLENGTH]);
224 * XOR ( DH value, MD5-1 | MD5-2).
226 isc_buffer_availableregion(secret, &r);
227 isc_buffer_usedregion(shared, &r2);
228 if (r.length < sizeof(digests) || r.length < r2.length)
229 return (ISC_R_NOSPACE);
230 if (r2.length > sizeof(digests)) {
231 memcpy(r.base, r2.base, r2.length);
232 for (i = 0; i < sizeof(digests); i++)
233 r.base[i] ^= digests[i];
234 isc_buffer_add(secret, r2.length);
237 memcpy(r.base, digests, sizeof(digests));
238 for (i = 0; i < r2.length; i++)
239 r.base[i] ^= r2.base[i];
240 isc_buffer_add(secret, sizeof(digests));
242 return (ISC_R_SUCCESS);
247 process_dhtkey(dns_message_t *msg, dns_name_t *signer, dns_name_t *name,
248 dns_rdata_tkey_t *tkeyin, dns_tkeyctx_t *tctx,
249 dns_rdata_tkey_t *tkeyout,
250 dns_tsig_keyring_t *ring, dns_namelist_t *namelist)
252 isc_result_t result = ISC_R_SUCCESS;
253 dns_name_t *keyname, ourname;
254 dns_rdataset_t *keyset = NULL;
255 dns_rdata_t keyrdata = DNS_RDATA_INIT, ourkeyrdata = DNS_RDATA_INIT;
256 isc_boolean_t found_key = ISC_FALSE, found_incompatible = ISC_FALSE;
257 dst_key_t *pubkey = NULL;
258 isc_buffer_t ourkeybuf, *shared = NULL;
259 isc_region_t r, r2, ourkeyr;
260 unsigned char keydata[DST_KEY_MAXSIZE];
261 unsigned int sharedsize;
263 unsigned char *randomdata = NULL, secretdata[256];
266 if (tctx->dhkey == NULL) {
267 tkey_log("process_dhtkey: tkey-dhkey not defined");
268 tkeyout->error = dns_tsigerror_badalg;
269 return (DNS_R_REFUSED);
272 if (!dns_name_equal(&tkeyin->algorithm, DNS_TSIG_HMACMD5_NAME)) {
273 tkey_log("process_dhtkey: algorithms other than "
274 "hmac-md5 are not supported");
275 tkeyout->error = dns_tsigerror_badalg;
276 return (ISC_R_SUCCESS);
280 * Look for a DH KEY record that will work with ours.
282 for (result = dns_message_firstname(msg, DNS_SECTION_ADDITIONAL);
283 result == ISC_R_SUCCESS && !found_key;
284 result = dns_message_nextname(msg, DNS_SECTION_ADDITIONAL))
287 dns_message_currentname(msg, DNS_SECTION_ADDITIONAL, &keyname);
289 result = dns_message_findtype(keyname, dns_rdatatype_key, 0,
291 if (result != ISC_R_SUCCESS)
294 for (result = dns_rdataset_first(keyset);
295 result == ISC_R_SUCCESS && !found_key;
296 result = dns_rdataset_next(keyset))
298 dns_rdataset_current(keyset, &keyrdata);
300 result = dns_dnssec_keyfromrdata(keyname, &keyrdata,
302 if (result != ISC_R_SUCCESS) {
303 dns_rdata_reset(&keyrdata);
306 if (dst_key_alg(pubkey) == DNS_KEYALG_DH) {
307 if (dst_key_paramcompare(pubkey, tctx->dhkey))
309 found_key = ISC_TRUE;
314 found_incompatible = ISC_TRUE;
316 dst_key_free(&pubkey);
317 dns_rdata_reset(&keyrdata);
322 if (found_incompatible) {
323 tkey_log("process_dhtkey: found an incompatible key");
324 tkeyout->error = dns_tsigerror_badkey;
325 return (ISC_R_SUCCESS);
327 tkey_log("process_dhtkey: failed to find a key");
328 return (DNS_R_FORMERR);
332 RETERR(add_rdata_to_list(msg, keyname, &keyrdata, ttl, namelist));
334 isc_buffer_init(&ourkeybuf, keydata, sizeof(keydata));
335 RETERR(dst_key_todns(tctx->dhkey, &ourkeybuf));
336 isc_buffer_usedregion(&ourkeybuf, &ourkeyr);
337 dns_rdata_fromregion(&ourkeyrdata, dns_rdataclass_any,
338 dns_rdatatype_key, &ourkeyr);
340 dns_name_init(&ourname, NULL);
341 dns_name_clone(dst_key_name(tctx->dhkey), &ourname);
344 * XXXBEW The TTL should be obtained from the database, if it exists.
346 RETERR(add_rdata_to_list(msg, &ourname, &ourkeyrdata, 0, namelist));
348 RETERR(dst_key_secretsize(tctx->dhkey, &sharedsize));
349 RETERR(isc_buffer_allocate(msg->mctx, &shared, sharedsize));
351 result = dst_key_computesecret(pubkey, tctx->dhkey, shared);
352 if (result != ISC_R_SUCCESS) {
353 tkey_log("process_dhtkey: failed to compute shared secret: %s",
354 isc_result_totext(result));
357 dst_key_free(&pubkey);
359 isc_buffer_init(&secret, secretdata, sizeof(secretdata));
361 randomdata = isc_mem_get(tctx->mctx, TKEY_RANDOM_AMOUNT);
362 if (randomdata == NULL)
365 result = isc_entropy_getdata(tctx->ectx, randomdata,
366 TKEY_RANDOM_AMOUNT, NULL, 0);
367 if (result != ISC_R_SUCCESS) {
368 tkey_log("process_dhtkey: failed to obtain entropy: %s",
369 isc_result_totext(result));
374 r.length = TKEY_RANDOM_AMOUNT;
375 r2.base = tkeyin->key;
376 r2.length = tkeyin->keylen;
377 RETERR(compute_secret(shared, &r2, &r, &secret));
378 isc_buffer_free(&shared);
380 RETERR(dns_tsigkey_create(name, &tkeyin->algorithm,
381 isc_buffer_base(&secret),
382 isc_buffer_usedlength(&secret),
383 ISC_TRUE, signer, tkeyin->inception,
384 tkeyin->expire, msg->mctx, ring, NULL));
386 /* This key is good for a long time */
387 tkeyout->inception = tkeyin->inception;
388 tkeyout->expire = tkeyin->expire;
390 tkeyout->key = randomdata;
391 tkeyout->keylen = TKEY_RANDOM_AMOUNT;
393 return (ISC_R_SUCCESS);
396 if (!ISC_LIST_EMPTY(*namelist))
397 free_namelist(msg, namelist);
399 isc_buffer_free(&shared);
401 dst_key_free(&pubkey);
402 if (randomdata == NULL)
403 isc_mem_put(tctx->mctx, randomdata, TKEY_RANDOM_AMOUNT);
408 process_gsstkey(dns_message_t *msg, dns_name_t *signer, dns_name_t *name,
409 dns_rdata_tkey_t *tkeyin, dns_tkeyctx_t *tctx,
410 dns_rdata_tkey_t *tkeyout,
411 dns_tsig_keyring_t *ring, dns_namelist_t *namelist)
413 isc_result_t result = ISC_R_SUCCESS;
414 dst_key_t *dstkey = NULL;
417 isc_region_t intoken;
418 unsigned char array[1024];
419 isc_buffer_t outtoken;
423 if (tctx->gsscred == NULL)
424 return (ISC_R_NOPERM);
426 if (!dns_name_equal(&tkeyin->algorithm, DNS_TSIG_GSSAPI_NAME) &&
427 !dns_name_equal(&tkeyin->algorithm, DNS_TSIG_GSSAPIMS_NAME)) {
428 tkeyout->error = dns_tsigerror_badalg;
429 return (ISC_R_SUCCESS);
432 intoken.base = tkeyin->key;
433 intoken.length = tkeyin->keylen;
435 isc_buffer_init(&outtoken, array, sizeof(array));
436 RETERR(dst_gssapi_acceptctx(name, tctx->gsscred, &intoken,
437 &outtoken, &gssctx));
440 RETERR(dst_key_fromgssapi(name, gssctx, msg->mctx, &dstkey));
442 result = dns_tsigkey_createfromkey(name, &tkeyin->algorithm,
443 dstkey, ISC_TRUE, signer,
444 tkeyin->inception, tkeyin->expire,
445 msg->mctx, ring, NULL);
446 if (result != ISC_R_SUCCESS)
449 if (result == ISC_R_NOTFOUND) {
450 tkeyout->error = dns_tsigerror_badalg;
451 return (ISC_R_SUCCESS);
453 if (result != ISC_R_SUCCESS)
456 /* This key is good for a long time */
457 isc_stdtime_get(&now);
458 tkeyout->inception = tkeyin->inception;
459 tkeyout->expire = tkeyin->expire;
461 tkeyout->key = isc_mem_get(msg->mctx,
462 isc_buffer_usedlength(&outtoken));
463 if (tkeyout->key == NULL) {
464 result = ISC_R_NOMEMORY;
467 tkeyout->keylen = isc_buffer_usedlength(&outtoken);
468 memcpy(tkeyout->key, isc_buffer_base(&outtoken), tkeyout->keylen);
470 return (ISC_R_SUCCESS);
474 dst_key_free(&dstkey);
480 process_deletetkey(dns_message_t *msg, dns_name_t *signer, dns_name_t *name,
481 dns_rdata_tkey_t *tkeyin,
482 dns_rdata_tkey_t *tkeyout,
483 dns_tsig_keyring_t *ring,
484 dns_namelist_t *namelist)
487 dns_tsigkey_t *tsigkey = NULL;
488 dns_name_t *identity;
493 result = dns_tsigkey_find(&tsigkey, name, &tkeyin->algorithm, ring);
494 if (result != ISC_R_SUCCESS) {
495 tkeyout->error = dns_tsigerror_badname;
496 return (ISC_R_SUCCESS);
500 * Only allow a delete if the identity that created the key is the
501 * same as the identity that signed the message.
503 identity = dns_tsigkey_identity(tsigkey);
504 if (identity == NULL || !dns_name_equal(identity, signer)) {
505 dns_tsigkey_detach(&tsigkey);
506 return (DNS_R_REFUSED);
510 * Set the key to be deleted when no references are left. If the key
511 * was not generated with TKEY and is in the config file, it may be
514 dns_tsigkey_setdeleted(tsigkey);
516 /* Release the reference */
517 dns_tsigkey_detach(&tsigkey);
519 return (ISC_R_SUCCESS);
523 dns_tkey_processquery(dns_message_t *msg, dns_tkeyctx_t *tctx,
524 dns_tsig_keyring_t *ring)
526 isc_result_t result = ISC_R_SUCCESS;
527 dns_rdata_tkey_t tkeyin, tkeyout;
528 isc_boolean_t freetkeyin = ISC_FALSE;
529 dns_name_t *qname, *name, *keyname, *signer, tsigner;
530 dns_fixedname_t fkeyname;
531 dns_rdataset_t *tkeyset;
533 dns_namelist_t namelist;
534 char tkeyoutdata[512];
535 isc_buffer_t tkeyoutbuf;
537 REQUIRE(msg != NULL);
538 REQUIRE(tctx != NULL);
539 REQUIRE(ring != NULL);
541 ISC_LIST_INIT(namelist);
544 * Interpret the question section.
546 result = dns_message_firstname(msg, DNS_SECTION_QUESTION);
547 if (result != ISC_R_SUCCESS)
548 return (DNS_R_FORMERR);
551 dns_message_currentname(msg, DNS_SECTION_QUESTION, &qname);
554 * Look for a TKEY record that matches the question.
558 result = dns_message_findname(msg, DNS_SECTION_ADDITIONAL, qname,
559 dns_rdatatype_tkey, 0, &name, &tkeyset);
560 if (result != ISC_R_SUCCESS) {
562 * Try the answer section, since that's where Win2000
565 if (dns_message_findname(msg, DNS_SECTION_ANSWER, qname,
566 dns_rdatatype_tkey, 0, &name,
567 &tkeyset) != ISC_R_SUCCESS)
569 result = DNS_R_FORMERR;
570 tkey_log("dns_tkey_processquery: couldn't find a TKEY "
571 "matching the question");
575 result = dns_rdataset_first(tkeyset);
576 if (result != ISC_R_SUCCESS) {
577 result = DNS_R_FORMERR;
580 dns_rdata_init(&rdata);
581 dns_rdataset_current(tkeyset, &rdata);
583 RETERR(dns_rdata_tostruct(&rdata, &tkeyin, NULL));
584 freetkeyin = ISC_TRUE;
586 if (tkeyin.error != dns_rcode_noerror) {
587 result = DNS_R_FORMERR;
592 * Before we go any farther, verify that the message was signed.
593 * GSSAPI TKEY doesn't require a signature, the rest do.
595 dns_name_init(&tsigner, NULL);
596 result = dns_message_signer(msg, &tsigner);
597 if (result != ISC_R_SUCCESS) {
598 if (tkeyin.mode == DNS_TKEYMODE_GSSAPI &&
599 result == ISC_R_NOTFOUND)
602 tkey_log("dns_tkey_processquery: query was not "
603 "properly signed - rejecting");
604 result = DNS_R_FORMERR;
610 tkeyout.common.rdclass = tkeyin.common.rdclass;
611 tkeyout.common.rdtype = tkeyin.common.rdtype;
612 ISC_LINK_INIT(&tkeyout.common, link);
613 tkeyout.mctx = msg->mctx;
615 dns_name_init(&tkeyout.algorithm, NULL);
616 dns_name_clone(&tkeyin.algorithm, &tkeyout.algorithm);
618 tkeyout.inception = tkeyout.expire = 0;
619 tkeyout.mode = tkeyin.mode;
621 tkeyout.keylen = tkeyout.otherlen = 0;
622 tkeyout.key = tkeyout.other = NULL;
625 * A delete operation must have a fully specified key name. If this
626 * is not a delete, we do the following:
628 * keyname = qname + defaultdomain
630 * keyname = <random hex> + defaultdomain
632 if (tkeyin.mode != DNS_TKEYMODE_DELETE) {
633 dns_tsigkey_t *tsigkey = NULL;
635 if (tctx->domain == NULL) {
636 tkey_log("dns_tkey_processquery: tkey-domain not set");
637 result = DNS_R_REFUSED;
641 dns_fixedname_init(&fkeyname);
642 keyname = dns_fixedname_name(&fkeyname);
644 if (!dns_name_equal(qname, dns_rootname)) {
645 unsigned int n = dns_name_countlabels(qname);
646 dns_name_copy(qname, keyname, NULL);
647 dns_name_getlabelsequence(keyname, 0, n - 1, keyname);
650 static char hexdigits[16] = {
651 '0', '1', '2', '3', '4', '5', '6', '7',
652 '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
653 unsigned char randomdata[16];
658 result = isc_entropy_getdata(tctx->ectx,
662 if (result != ISC_R_SUCCESS)
665 for (i = 0, j = 0; i < sizeof(randomdata); i++) {
666 unsigned char val = randomdata[i];
667 randomtext[j++] = hexdigits[val >> 4];
668 randomtext[j++] = hexdigits[val & 0xF];
670 isc_buffer_init(&b, randomtext, sizeof(randomtext));
671 isc_buffer_add(&b, sizeof(randomtext));
672 result = dns_name_fromtext(keyname, &b, NULL,
674 if (result != ISC_R_SUCCESS)
677 result = dns_name_concatenate(keyname, tctx->domain,
679 if (result != ISC_R_SUCCESS)
682 result = dns_tsigkey_find(&tsigkey, keyname, NULL, ring);
683 if (result == ISC_R_SUCCESS) {
684 tkeyout.error = dns_tsigerror_badname;
685 dns_tsigkey_detach(&tsigkey);
686 goto failure_with_tkey;
688 else if (result != ISC_R_NOTFOUND)
694 switch (tkeyin.mode) {
695 case DNS_TKEYMODE_DIFFIEHELLMAN:
696 tkeyout.error = dns_rcode_noerror;
697 RETERR(process_dhtkey(msg, signer, keyname, &tkeyin,
698 tctx, &tkeyout, ring,
701 case DNS_TKEYMODE_GSSAPI:
702 tkeyout.error = dns_rcode_noerror;
703 RETERR(process_gsstkey(msg, signer, keyname, &tkeyin,
704 tctx, &tkeyout, ring,
707 case DNS_TKEYMODE_DELETE:
708 tkeyout.error = dns_rcode_noerror;
709 RETERR(process_deletetkey(msg, signer, keyname,
713 case DNS_TKEYMODE_SERVERASSIGNED:
714 case DNS_TKEYMODE_RESOLVERASSIGNED:
715 result = DNS_R_NOTIMP;
718 tkeyout.error = dns_tsigerror_badmode;
722 dns_rdata_init(&rdata);
723 isc_buffer_init(&tkeyoutbuf, tkeyoutdata, sizeof(tkeyoutdata));
724 result = dns_rdata_fromstruct(&rdata, tkeyout.common.rdclass,
725 tkeyout.common.rdtype, &tkeyout,
729 dns_rdata_freestruct(&tkeyin);
730 freetkeyin = ISC_FALSE;
733 if (tkeyout.key != NULL)
734 isc_mem_put(msg->mctx, tkeyout.key, tkeyout.keylen);
735 if (tkeyout.other != NULL)
736 isc_mem_put(msg->mctx, tkeyout.other, tkeyout.otherlen);
737 if (result != ISC_R_SUCCESS)
740 RETERR(add_rdata_to_list(msg, keyname, &rdata, 0, &namelist));
742 RETERR(dns_message_reply(msg, ISC_TRUE));
744 name = ISC_LIST_HEAD(namelist);
745 while (name != NULL) {
746 dns_name_t *next = ISC_LIST_NEXT(name, link);
747 ISC_LIST_UNLINK(namelist, name, link);
748 dns_message_addname(msg, name, DNS_SECTION_ANSWER);
752 return (ISC_R_SUCCESS);
756 dns_rdata_freestruct(&tkeyin);
757 if (!ISC_LIST_EMPTY(namelist))
758 free_namelist(msg, &namelist);
763 buildquery(dns_message_t *msg, dns_name_t *name,
764 dns_rdata_tkey_t *tkey)
766 dns_name_t *qname = NULL, *aname = NULL;
767 dns_rdataset_t *question = NULL, *tkeyset = NULL;
768 dns_rdatalist_t *tkeylist = NULL;
769 dns_rdata_t *rdata = NULL;
770 isc_buffer_t *dynbuf = NULL;
773 REQUIRE(msg != NULL);
774 REQUIRE(name != NULL);
775 REQUIRE(tkey != NULL);
777 RETERR(dns_message_gettempname(msg, &qname));
778 RETERR(dns_message_gettempname(msg, &aname));
780 RETERR(dns_message_gettemprdataset(msg, &question));
781 dns_rdataset_init(question);
782 dns_rdataset_makequestion(question, dns_rdataclass_any,
785 RETERR(isc_buffer_allocate(msg->mctx, &dynbuf, 512));
786 RETERR(dns_message_gettemprdata(msg, &rdata));
787 RETERR(dns_rdata_fromstruct(rdata, dns_rdataclass_any,
788 dns_rdatatype_tkey, tkey, dynbuf));
789 dns_message_takebuffer(msg, &dynbuf);
791 RETERR(dns_message_gettemprdatalist(msg, &tkeylist));
792 tkeylist->rdclass = dns_rdataclass_any;
793 tkeylist->type = dns_rdatatype_tkey;
794 tkeylist->covers = 0;
796 ISC_LIST_INIT(tkeylist->rdata);
797 ISC_LIST_APPEND(tkeylist->rdata, rdata, link);
799 RETERR(dns_message_gettemprdataset(msg, &tkeyset));
800 dns_rdataset_init(tkeyset);
801 RETERR(dns_rdatalist_tordataset(tkeylist, tkeyset));
803 dns_name_init(qname, NULL);
804 dns_name_clone(name, qname);
806 dns_name_init(aname, NULL);
807 dns_name_clone(name, aname);
809 ISC_LIST_APPEND(qname->list, question, link);
810 ISC_LIST_APPEND(aname->list, tkeyset, link);
812 dns_message_addname(msg, qname, DNS_SECTION_QUESTION);
813 dns_message_addname(msg, aname, DNS_SECTION_ADDITIONAL);
815 return (ISC_R_SUCCESS);
819 dns_message_puttempname(msg, &qname);
821 dns_message_puttempname(msg, &aname);
822 if (question != NULL) {
823 dns_rdataset_disassociate(question);
824 dns_message_puttemprdataset(msg, &question);
827 isc_buffer_free(&dynbuf);
832 dns_tkey_builddhquery(dns_message_t *msg, dst_key_t *key, dns_name_t *name,
833 dns_name_t *algorithm, isc_buffer_t *nonce,
834 isc_uint32_t lifetime)
836 dns_rdata_tkey_t tkey;
837 dns_rdata_t *rdata = NULL;
838 isc_buffer_t *dynbuf = NULL;
841 dns_namelist_t namelist;
845 REQUIRE(msg != NULL);
846 REQUIRE(key != NULL);
847 REQUIRE(dst_key_alg(key) == DNS_KEYALG_DH);
848 REQUIRE(dst_key_isprivate(key));
849 REQUIRE(name != NULL);
850 REQUIRE(algorithm != NULL);
852 tkey.common.rdclass = dns_rdataclass_any;
853 tkey.common.rdtype = dns_rdatatype_tkey;
854 ISC_LINK_INIT(&tkey.common, link);
855 tkey.mctx = msg->mctx;
856 dns_name_init(&tkey.algorithm, NULL);
857 dns_name_clone(algorithm, &tkey.algorithm);
858 isc_stdtime_get(&now);
859 tkey.inception = now;
860 tkey.expire = now + lifetime;
861 tkey.mode = DNS_TKEYMODE_DIFFIEHELLMAN;
863 isc_buffer_usedregion(nonce, &r);
865 r.base = isc_mem_get(msg->mctx, 0);
870 tkey.keylen = r.length;
874 RETERR(buildquery(msg, name, &tkey));
877 isc_mem_put(msg->mctx, r.base, 0);
879 RETERR(dns_message_gettemprdata(msg, &rdata));
880 RETERR(isc_buffer_allocate(msg->mctx, &dynbuf, 1024));
881 RETERR(dst_key_todns(key, dynbuf));
882 isc_buffer_usedregion(dynbuf, &r);
883 dns_rdata_fromregion(rdata, dns_rdataclass_any,
884 dns_rdatatype_key, &r);
885 dns_message_takebuffer(msg, &dynbuf);
887 dns_name_init(&keyname, NULL);
888 dns_name_clone(dst_key_name(key), &keyname);
890 ISC_LIST_INIT(namelist);
891 RETERR(add_rdata_to_list(msg, &keyname, rdata, 0, &namelist));
892 dns_message_addname(msg, ISC_LIST_HEAD(namelist),
893 DNS_SECTION_ADDITIONAL);
895 return (ISC_R_SUCCESS);
900 isc_buffer_free(&dynbuf);
905 dns_tkey_buildgssquery(dns_message_t *msg, dns_name_t *name,
906 dns_name_t *gname, void *cred,
907 isc_uint32_t lifetime, void **context)
909 dns_rdata_tkey_t tkey;
913 unsigned char array[1024];
915 REQUIRE(msg != NULL);
916 REQUIRE(name != NULL);
917 REQUIRE(gname != NULL);
918 REQUIRE(context != NULL && *context == NULL);
920 isc_buffer_init(&token, array, sizeof(array));
921 result = dst_gssapi_initctx(gname, cred, NULL, &token, context);
922 if (result != DNS_R_CONTINUE && result != ISC_R_SUCCESS)
925 tkey.common.rdclass = dns_rdataclass_any;
926 tkey.common.rdtype = dns_rdatatype_tkey;
927 ISC_LINK_INIT(&tkey.common, link);
929 dns_name_init(&tkey.algorithm, NULL);
930 dns_name_clone(DNS_TSIG_GSSAPI_NAME, &tkey.algorithm);
931 isc_stdtime_get(&now);
932 tkey.inception = now;
933 tkey.expire = now + lifetime;
934 tkey.mode = DNS_TKEYMODE_GSSAPI;
936 tkey.key = isc_buffer_base(&token);
937 tkey.keylen = isc_buffer_usedlength(&token);
941 RETERR(buildquery(msg, name, &tkey));
943 return (ISC_R_SUCCESS);
950 dns_tkey_builddeletequery(dns_message_t *msg, dns_tsigkey_t *key) {
951 dns_rdata_tkey_t tkey;
953 REQUIRE(msg != NULL);
954 REQUIRE(key != NULL);
956 tkey.common.rdclass = dns_rdataclass_any;
957 tkey.common.rdtype = dns_rdatatype_tkey;
958 ISC_LINK_INIT(&tkey.common, link);
959 tkey.mctx = msg->mctx;
960 dns_name_init(&tkey.algorithm, NULL);
961 dns_name_clone(key->algorithm, &tkey.algorithm);
962 tkey.inception = tkey.expire = 0;
963 tkey.mode = DNS_TKEYMODE_DELETE;
965 tkey.keylen = tkey.otherlen = 0;
966 tkey.key = tkey.other = NULL;
968 return (buildquery(msg, &key->name, &tkey));
972 find_tkey(dns_message_t *msg, dns_name_t **name, dns_rdata_t *rdata,
975 dns_rdataset_t *tkeyset;
978 result = dns_message_firstname(msg, section);
979 while (result == ISC_R_SUCCESS) {
981 dns_message_currentname(msg, section, name);
983 result = dns_message_findtype(*name, dns_rdatatype_tkey, 0,
985 if (result == ISC_R_SUCCESS) {
986 result = dns_rdataset_first(tkeyset);
987 if (result != ISC_R_SUCCESS)
989 dns_rdataset_current(tkeyset, rdata);
990 return (ISC_R_SUCCESS);
992 result = dns_message_nextname(msg, section);
994 if (result == ISC_R_NOMORE)
995 return (ISC_R_NOTFOUND);
1000 dns_tkey_processdhresponse(dns_message_t *qmsg, dns_message_t *rmsg,
1001 dst_key_t *key, isc_buffer_t *nonce,
1002 dns_tsigkey_t **outkey, dns_tsig_keyring_t *ring)
1004 dns_rdata_t qtkeyrdata = DNS_RDATA_INIT, rtkeyrdata = DNS_RDATA_INIT;
1005 dns_name_t keyname, *tkeyname, *theirkeyname, *ourkeyname, *tempname;
1006 dns_rdataset_t *theirkeyset = NULL, *ourkeyset = NULL;
1007 dns_rdata_t theirkeyrdata = DNS_RDATA_INIT;
1008 dst_key_t *theirkey = NULL;
1009 dns_rdata_tkey_t qtkey, rtkey;
1010 unsigned char secretdata[256];
1011 unsigned int sharedsize;
1012 isc_buffer_t *shared = NULL, secret;
1014 isc_result_t result;
1015 isc_boolean_t freertkey = ISC_FALSE;
1017 REQUIRE(qmsg != NULL);
1018 REQUIRE(rmsg != NULL);
1019 REQUIRE(key != NULL);
1020 REQUIRE(dst_key_alg(key) == DNS_KEYALG_DH);
1021 REQUIRE(dst_key_isprivate(key));
1023 REQUIRE(*outkey == NULL);
1025 if (rmsg->rcode != dns_rcode_noerror)
1026 return (ISC_RESULTCLASS_DNSRCODE + rmsg->rcode);
1027 RETERR(find_tkey(rmsg, &tkeyname, &rtkeyrdata, DNS_SECTION_ANSWER));
1028 RETERR(dns_rdata_tostruct(&rtkeyrdata, &rtkey, NULL));
1029 freertkey = ISC_TRUE;
1031 RETERR(find_tkey(qmsg, &tempname, &qtkeyrdata,
1032 DNS_SECTION_ADDITIONAL));
1033 RETERR(dns_rdata_tostruct(&qtkeyrdata, &qtkey, NULL));
1035 if (rtkey.error != dns_rcode_noerror ||
1036 rtkey.mode != DNS_TKEYMODE_DIFFIEHELLMAN ||
1037 rtkey.mode != qtkey.mode ||
1038 !dns_name_equal(&rtkey.algorithm, &qtkey.algorithm) ||
1039 rmsg->rcode != dns_rcode_noerror)
1041 tkey_log("dns_tkey_processdhresponse: tkey mode invalid "
1043 result = DNS_R_INVALIDTKEY;
1044 dns_rdata_freestruct(&qtkey);
1048 dns_rdata_freestruct(&qtkey);
1050 dns_name_init(&keyname, NULL);
1051 dns_name_clone(dst_key_name(key), &keyname);
1055 RETERR(dns_message_findname(rmsg, DNS_SECTION_ANSWER, &keyname,
1056 dns_rdatatype_key, 0, &ourkeyname,
1059 result = dns_message_firstname(rmsg, DNS_SECTION_ANSWER);
1060 while (result == ISC_R_SUCCESS) {
1061 theirkeyname = NULL;
1062 dns_message_currentname(rmsg, DNS_SECTION_ANSWER,
1064 if (dns_name_equal(theirkeyname, ourkeyname))
1067 result = dns_message_findtype(theirkeyname, dns_rdatatype_key,
1069 if (result == ISC_R_SUCCESS) {
1070 RETERR(dns_rdataset_first(theirkeyset));
1074 result = dns_message_nextname(rmsg, DNS_SECTION_ANSWER);
1077 if (theirkeyset == NULL) {
1078 tkey_log("dns_tkey_processdhresponse: failed to find server "
1080 result = ISC_R_NOTFOUND;
1084 dns_rdataset_current(theirkeyset, &theirkeyrdata);
1085 RETERR(dns_dnssec_keyfromrdata(theirkeyname, &theirkeyrdata,
1086 rmsg->mctx, &theirkey));
1088 RETERR(dst_key_secretsize(key, &sharedsize));
1089 RETERR(isc_buffer_allocate(rmsg->mctx, &shared, sharedsize));
1091 RETERR(dst_key_computesecret(theirkey, key, shared));
1093 isc_buffer_init(&secret, secretdata, sizeof(secretdata));
1096 r.length = rtkey.keylen;
1098 isc_buffer_usedregion(nonce, &r2);
1100 r2.base = isc_mem_get(rmsg->mctx, 0);
1103 RETERR(compute_secret(shared, &r2, &r, &secret));
1105 isc_mem_put(rmsg->mctx, r2.base, 0);
1107 isc_buffer_usedregion(&secret, &r);
1108 result = dns_tsigkey_create(tkeyname, &rtkey.algorithm,
1109 r.base, r.length, ISC_TRUE,
1110 NULL, rtkey.inception, rtkey.expire,
1111 rmsg->mctx, ring, outkey);
1112 isc_buffer_free(&shared);
1113 dns_rdata_freestruct(&rtkey);
1114 dst_key_free(&theirkey);
1119 isc_buffer_free(&shared);
1121 if (theirkey != NULL)
1122 dst_key_free(&theirkey);
1125 dns_rdata_freestruct(&rtkey);
1131 dns_tkey_processgssresponse(dns_message_t *qmsg, dns_message_t *rmsg,
1132 dns_name_t *gname, void *cred, void **context,
1133 dns_tsigkey_t **outkey, dns_tsig_keyring_t *ring)
1135 dns_rdata_t rtkeyrdata = DNS_RDATA_INIT, qtkeyrdata = DNS_RDATA_INIT;
1136 dns_name_t *tkeyname;
1137 dns_rdata_tkey_t rtkey, qtkey;
1138 isc_buffer_t outtoken;
1139 dst_key_t *dstkey = NULL;
1141 isc_result_t result;
1142 unsigned char array[1024];
1144 REQUIRE(qmsg != NULL);
1145 REQUIRE(rmsg != NULL);
1146 REQUIRE(gname != NULL);
1148 REQUIRE(*outkey == NULL);
1150 if (rmsg->rcode != dns_rcode_noerror)
1151 return (ISC_RESULTCLASS_DNSRCODE + rmsg->rcode);
1152 RETERR(find_tkey(rmsg, &tkeyname, &rtkeyrdata, DNS_SECTION_ANSWER));
1153 RETERR(dns_rdata_tostruct(&rtkeyrdata, &rtkey, NULL));
1155 RETERR(find_tkey(qmsg, &tkeyname, &qtkeyrdata,
1156 DNS_SECTION_ADDITIONAL));
1157 RETERR(dns_rdata_tostruct(&qtkeyrdata, &qtkey, NULL));
1159 if (rtkey.error != dns_rcode_noerror ||
1160 rtkey.mode != DNS_TKEYMODE_GSSAPI ||
1161 !dns_name_equal(&rtkey.algorithm, &rtkey.algorithm))
1163 tkey_log("dns_tkey_processdhresponse: tkey mode invalid "
1165 result = DNS_R_INVALIDTKEY;
1169 isc_buffer_init(&outtoken, array, sizeof(array));
1171 r.length = rtkey.keylen;
1172 RETERR(dst_gssapi_initctx(gname, cred, &r, &outtoken, context));
1175 RETERR(dst_key_fromgssapi(dns_rootname, *context, rmsg->mctx,
1178 RETERR(dns_tsigkey_createfromkey(tkeyname, DNS_TSIG_GSSAPI_NAME,
1179 dstkey, ISC_TRUE, NULL,
1180 rtkey.inception, rtkey.expire,
1181 rmsg->mctx, ring, outkey));
1183 dns_rdata_freestruct(&rtkey);
1191 dns_tkey_processdeleteresponse(dns_message_t *qmsg, dns_message_t *rmsg,
1192 dns_tsig_keyring_t *ring)
1194 dns_rdata_t qtkeyrdata = DNS_RDATA_INIT, rtkeyrdata = DNS_RDATA_INIT;
1195 dns_name_t *tkeyname, *tempname;
1196 dns_rdata_tkey_t qtkey, rtkey;
1197 dns_tsigkey_t *tsigkey = NULL;
1198 isc_result_t result;
1200 REQUIRE(qmsg != NULL);
1201 REQUIRE(rmsg != NULL);
1203 if (rmsg->rcode != dns_rcode_noerror)
1204 return(ISC_RESULTCLASS_DNSRCODE + rmsg->rcode);
1206 RETERR(find_tkey(rmsg, &tkeyname, &rtkeyrdata, DNS_SECTION_ANSWER));
1207 RETERR(dns_rdata_tostruct(&rtkeyrdata, &rtkey, NULL));
1209 RETERR(find_tkey(qmsg, &tempname, &qtkeyrdata,
1210 DNS_SECTION_ADDITIONAL));
1211 RETERR(dns_rdata_tostruct(&qtkeyrdata, &qtkey, NULL));
1213 if (rtkey.error != dns_rcode_noerror ||
1214 rtkey.mode != DNS_TKEYMODE_DELETE ||
1215 rtkey.mode != qtkey.mode ||
1216 !dns_name_equal(&rtkey.algorithm, &qtkey.algorithm) ||
1217 rmsg->rcode != dns_rcode_noerror)
1219 tkey_log("dns_tkey_processdeleteresponse: tkey mode invalid "
1221 result = DNS_R_INVALIDTKEY;
1222 dns_rdata_freestruct(&qtkey);
1223 dns_rdata_freestruct(&rtkey);
1227 dns_rdata_freestruct(&qtkey);
1229 RETERR(dns_tsigkey_find(&tsigkey, tkeyname, &rtkey.algorithm, ring));
1231 dns_rdata_freestruct(&rtkey);
1234 * Mark the key as deleted.
1236 dns_tsigkey_setdeleted(tsigkey);
1238 * Release the reference.
1240 dns_tsigkey_detach(&tsigkey);