2 * Copyright (C) 2004-2008 Internet Systems Consortium, Inc. ("ISC")
3 * Copyright (C) 1999-2002 Internet Software Consortium.
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.
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: tsig.c,v 1.136 2008/11/04 21:23:14 marka Exp $
25 #include <isc/buffer.h>
27 #include <isc/print.h>
28 #include <isc/refcount.h>
29 #include <isc/string.h> /* Required for HP/UX (and others?) */
33 #include <dns/keyvalues.h>
35 #include <dns/message.h>
36 #include <dns/fixedname.h>
38 #include <dns/rdata.h>
39 #include <dns/rdatalist.h>
40 #include <dns/rdataset.h>
41 #include <dns/rdatastruct.h>
42 #include <dns/result.h>
45 #include <dst/result.h>
47 #define TSIG_MAGIC ISC_MAGIC('T', 'S', 'I', 'G')
48 #define VALID_TSIG_KEY(x) ISC_MAGIC_VALID(x, TSIG_MAGIC)
50 #define is_response(msg) (msg->flags & DNS_MESSAGEFLAG_QR)
51 #define algname_is_allocated(algname) \
52 ((algname) != dns_tsig_hmacmd5_name && \
53 (algname) != dns_tsig_hmacsha1_name && \
54 (algname) != dns_tsig_hmacsha224_name && \
55 (algname) != dns_tsig_hmacsha256_name && \
56 (algname) != dns_tsig_hmacsha384_name && \
57 (algname) != dns_tsig_hmacsha512_name && \
58 (algname) != dns_tsig_gssapi_name && \
59 (algname) != dns_tsig_gssapims_name)
63 static unsigned char hmacmd5_ndata[] = "\010hmac-md5\007sig-alg\003reg\003int";
64 static unsigned char hmacmd5_offsets[] = { 0, 9, 17, 21, 25 };
66 static dns_name_t hmacmd5 = {
69 DNS_NAMEATTR_READONLY | DNS_NAMEATTR_ABSOLUTE,
70 hmacmd5_offsets, NULL,
71 {(void *)-1, (void *)-1},
75 dns_name_t *dns_tsig_hmacmd5_name = &hmacmd5;
77 static unsigned char gsstsig_ndata[] = "\010gss-tsig";
78 static unsigned char gsstsig_offsets[] = { 0, 9 };
79 static dns_name_t gsstsig = {
82 DNS_NAMEATTR_READONLY | DNS_NAMEATTR_ABSOLUTE,
83 gsstsig_offsets, NULL,
84 {(void *)-1, (void *)-1},
87 LIBDNS_EXTERNAL_DATA dns_name_t *dns_tsig_gssapi_name = &gsstsig;
90 * Since Microsoft doesn't follow its own standard, we will use this
91 * alternate name as a second guess.
93 static unsigned char gsstsigms_ndata[] = "\003gss\011microsoft\003com";
94 static unsigned char gsstsigms_offsets[] = { 0, 4, 14, 18 };
95 static dns_name_t gsstsigms = {
97 gsstsigms_ndata, 19, 4,
98 DNS_NAMEATTR_READONLY | DNS_NAMEATTR_ABSOLUTE,
99 gsstsigms_offsets, NULL,
100 {(void *)-1, (void *)-1},
103 LIBDNS_EXTERNAL_DATA dns_name_t *dns_tsig_gssapims_name = &gsstsigms;
105 static unsigned char hmacsha1_ndata[] = "\011hmac-sha1";
106 static unsigned char hmacsha1_offsets[] = { 0, 10 };
108 static dns_name_t hmacsha1 = {
110 hmacsha1_ndata, 11, 2,
111 DNS_NAMEATTR_READONLY | DNS_NAMEATTR_ABSOLUTE,
112 hmacsha1_offsets, NULL,
113 {(void *)-1, (void *)-1},
117 LIBDNS_EXTERNAL_DATA dns_name_t *dns_tsig_hmacsha1_name = &hmacsha1;
119 static unsigned char hmacsha224_ndata[] = "\013hmac-sha224";
120 static unsigned char hmacsha224_offsets[] = { 0, 12 };
122 static dns_name_t hmacsha224 = {
124 hmacsha224_ndata, 13, 2,
125 DNS_NAMEATTR_READONLY | DNS_NAMEATTR_ABSOLUTE,
126 hmacsha224_offsets, NULL,
127 {(void *)-1, (void *)-1},
131 LIBDNS_EXTERNAL_DATA dns_name_t *dns_tsig_hmacsha224_name = &hmacsha224;
133 static unsigned char hmacsha256_ndata[] = "\013hmac-sha256";
134 static unsigned char hmacsha256_offsets[] = { 0, 12 };
136 static dns_name_t hmacsha256 = {
138 hmacsha256_ndata, 13, 2,
139 DNS_NAMEATTR_READONLY | DNS_NAMEATTR_ABSOLUTE,
140 hmacsha256_offsets, NULL,
141 {(void *)-1, (void *)-1},
145 LIBDNS_EXTERNAL_DATA dns_name_t *dns_tsig_hmacsha256_name = &hmacsha256;
147 static unsigned char hmacsha384_ndata[] = "\013hmac-sha384";
148 static unsigned char hmacsha384_offsets[] = { 0, 12 };
150 static dns_name_t hmacsha384 = {
152 hmacsha384_ndata, 13, 2,
153 DNS_NAMEATTR_READONLY | DNS_NAMEATTR_ABSOLUTE,
154 hmacsha384_offsets, NULL,
155 {(void *)-1, (void *)-1},
159 LIBDNS_EXTERNAL_DATA dns_name_t *dns_tsig_hmacsha384_name = &hmacsha384;
161 static unsigned char hmacsha512_ndata[] = "\013hmac-sha512";
162 static unsigned char hmacsha512_offsets[] = { 0, 12 };
164 static dns_name_t hmacsha512 = {
166 hmacsha512_ndata, 13, 2,
167 DNS_NAMEATTR_READONLY | DNS_NAMEATTR_ABSOLUTE,
168 hmacsha512_offsets, NULL,
169 {(void *)-1, (void *)-1},
173 LIBDNS_EXTERNAL_DATA dns_name_t *dns_tsig_hmacsha512_name = &hmacsha512;
176 tsig_verify_tcp(isc_buffer_t *source, dns_message_t *msg);
179 tsig_log(dns_tsigkey_t *key, int level, const char *fmt, ...)
180 ISC_FORMAT_PRINTF(3, 4);
183 cleanup_ring(dns_tsig_keyring_t *ring);
185 tsigkey_free(dns_tsigkey_t *key);
188 tsig_log(dns_tsigkey_t *key, int level, const char *fmt, ...) {
191 char namestr[DNS_NAME_FORMATSIZE];
192 char creatorstr[DNS_NAME_FORMATSIZE];
194 if (isc_log_wouldlog(dns_lctx, level) == ISC_FALSE)
197 dns_name_format(&key->name, namestr, sizeof(namestr));
199 strcpy(namestr, "<null>");
201 if (key != NULL && key->generated)
202 dns_name_format(key->creator, creatorstr, sizeof(creatorstr));
205 vsnprintf(message, sizeof(message), fmt, ap);
207 if (key != NULL && key->generated)
208 isc_log_write(dns_lctx,
209 DNS_LOGCATEGORY_DNSSEC, DNS_LOGMODULE_TSIG,
210 level, "tsig key '%s' (%s): %s",
211 namestr, creatorstr, message);
213 isc_log_write(dns_lctx,
214 DNS_LOGCATEGORY_DNSSEC, DNS_LOGMODULE_TSIG,
215 level, "tsig key '%s': %s", namestr, message);
219 dns_tsigkey_createfromkey(dns_name_t *name, dns_name_t *algorithm,
220 dst_key_t *dstkey, isc_boolean_t generated,
221 dns_name_t *creator, isc_stdtime_t inception,
222 isc_stdtime_t expire, isc_mem_t *mctx,
223 dns_tsig_keyring_t *ring, dns_tsigkey_t **key)
227 unsigned int refs = 0;
229 REQUIRE(key == NULL || *key == NULL);
230 REQUIRE(name != NULL);
231 REQUIRE(algorithm != NULL);
232 REQUIRE(mctx != NULL);
233 REQUIRE(key != NULL || ring != NULL);
235 tkey = (dns_tsigkey_t *) isc_mem_get(mctx, sizeof(dns_tsigkey_t));
237 return (ISC_R_NOMEMORY);
239 dns_name_init(&tkey->name, NULL);
240 ret = dns_name_dup(name, mctx, &tkey->name);
241 if (ret != ISC_R_SUCCESS)
243 (void)dns_name_downcase(&tkey->name, &tkey->name, NULL);
245 if (dns_name_equal(algorithm, DNS_TSIG_HMACMD5_NAME)) {
246 tkey->algorithm = DNS_TSIG_HMACMD5_NAME;
247 if (dstkey != NULL && dst_key_alg(dstkey) != DST_ALG_HMACMD5) {
251 } else if (dns_name_equal(algorithm, DNS_TSIG_HMACSHA1_NAME)) {
252 tkey->algorithm = DNS_TSIG_HMACSHA1_NAME;
253 if (dstkey != NULL && dst_key_alg(dstkey) != DST_ALG_HMACSHA1) {
257 } else if (dns_name_equal(algorithm, DNS_TSIG_HMACSHA224_NAME)) {
258 tkey->algorithm = DNS_TSIG_HMACSHA224_NAME;
259 if (dstkey != NULL &&
260 dst_key_alg(dstkey) != DST_ALG_HMACSHA224) {
264 } else if (dns_name_equal(algorithm, DNS_TSIG_HMACSHA256_NAME)) {
265 tkey->algorithm = DNS_TSIG_HMACSHA256_NAME;
266 if (dstkey != NULL &&
267 dst_key_alg(dstkey) != DST_ALG_HMACSHA256) {
271 } else if (dns_name_equal(algorithm, DNS_TSIG_HMACSHA384_NAME)) {
272 tkey->algorithm = DNS_TSIG_HMACSHA384_NAME;
273 if (dstkey != NULL &&
274 dst_key_alg(dstkey) != DST_ALG_HMACSHA384) {
278 } else if (dns_name_equal(algorithm, DNS_TSIG_HMACSHA512_NAME)) {
279 tkey->algorithm = DNS_TSIG_HMACSHA512_NAME;
280 if (dstkey != NULL &&
281 dst_key_alg(dstkey) != DST_ALG_HMACSHA512) {
285 } else if (dns_name_equal(algorithm, DNS_TSIG_GSSAPI_NAME)) {
286 tkey->algorithm = DNS_TSIG_GSSAPI_NAME;
287 if (dstkey != NULL && dst_key_alg(dstkey) != DST_ALG_GSSAPI) {
291 } else if (dns_name_equal(algorithm, DNS_TSIG_GSSAPIMS_NAME)) {
292 tkey->algorithm = DNS_TSIG_GSSAPIMS_NAME;
293 if (dstkey != NULL && dst_key_alg(dstkey) != DST_ALG_GSSAPI) {
298 if (dstkey != NULL) {
302 tkey->algorithm = isc_mem_get(mctx, sizeof(dns_name_t));
303 if (tkey->algorithm == NULL) {
304 ret = ISC_R_NOMEMORY;
307 dns_name_init(tkey->algorithm, NULL);
308 ret = dns_name_dup(algorithm, mctx, tkey->algorithm);
309 if (ret != ISC_R_SUCCESS)
310 goto cleanup_algorithm;
311 (void)dns_name_downcase(tkey->algorithm, tkey->algorithm,
315 if (creator != NULL) {
316 tkey->creator = isc_mem_get(mctx, sizeof(dns_name_t));
317 if (tkey->creator == NULL) {
318 ret = ISC_R_NOMEMORY;
319 goto cleanup_algorithm;
321 dns_name_init(tkey->creator, NULL);
322 ret = dns_name_dup(creator, mctx, tkey->creator);
323 if (ret != ISC_R_SUCCESS) {
324 isc_mem_put(mctx, tkey->creator, sizeof(dns_name_t));
325 goto cleanup_algorithm;
328 tkey->creator = NULL;
337 ret = isc_refcount_init(&tkey->refs, refs);
338 if (ret != ISC_R_SUCCESS)
339 goto cleanup_creator;
341 tkey->generated = generated;
342 tkey->inception = inception;
343 tkey->expire = expire;
345 isc_mem_attach(mctx, &tkey->mctx);
347 tkey->magic = TSIG_MAGIC;
350 RWLOCK(&ring->lock, isc_rwlocktype_write);
354 * Do on the fly cleaning. Find some nodes we might not
355 * want around any more.
357 if (ring->writecount > 10) {
359 ring->writecount = 0;
361 ret = dns_rbt_addname(ring->keys, name, tkey);
362 if (ret != ISC_R_SUCCESS) {
363 RWUNLOCK(&ring->lock, isc_rwlocktype_write);
366 RWUNLOCK(&ring->lock, isc_rwlocktype_write);
370 * Ignore this if it's a GSS key, since the key size is meaningless.
372 if (dstkey != NULL && dst_key_size(dstkey) < 64 &&
373 !dns_name_equal(algorithm, DNS_TSIG_GSSAPI_NAME) &&
374 !dns_name_equal(algorithm, DNS_TSIG_GSSAPIMS_NAME)) {
375 char namestr[DNS_NAME_FORMATSIZE];
376 dns_name_format(name, namestr, sizeof(namestr));
377 isc_log_write(dns_lctx, DNS_LOGCATEGORY_DNSSEC,
378 DNS_LOGMODULE_TSIG, ISC_LOG_INFO,
379 "the key '%s' is too short to be secure",
385 return (ISC_R_SUCCESS);
390 isc_refcount_decrement(&tkey->refs, NULL);
391 isc_refcount_destroy(&tkey->refs);
393 if (tkey->creator != NULL) {
394 dns_name_free(tkey->creator, mctx);
395 isc_mem_put(mctx, tkey->creator, sizeof(dns_name_t));
398 if (algname_is_allocated(tkey->algorithm)) {
399 if (dns_name_dynamic(tkey->algorithm))
400 dns_name_free(tkey->algorithm, mctx);
401 isc_mem_put(mctx, tkey->algorithm, sizeof(dns_name_t));
404 dns_name_free(&tkey->name, mctx);
406 isc_mem_put(mctx, tkey, sizeof(dns_tsigkey_t));
412 * Find a few nodes to destroy if possible.
415 cleanup_ring(dns_tsig_keyring_t *ring)
418 dns_rbtnodechain_t chain;
419 dns_name_t foundname;
420 dns_fixedname_t fixedorigin;
427 * Start up a new iterator each time.
429 isc_stdtime_get(&now);
430 dns_name_init(&foundname, NULL);
431 dns_fixedname_init(&fixedorigin);
432 origin = dns_fixedname_name(&fixedorigin);
435 dns_rbtnodechain_init(&chain, ring->mctx);
436 result = dns_rbtnodechain_first(&chain, ring->keys, &foundname,
438 if (result != ISC_R_SUCCESS && result != DNS_R_NEWORIGIN) {
439 dns_rbtnodechain_invalidate(&chain);
445 dns_rbtnodechain_current(&chain, &foundname, origin, &node);
449 && isc_refcount_current(&tkey->refs) == 1
450 && tkey->inception != tkey->expire
451 && tkey->expire < now) {
452 tsig_log(tkey, 2, "tsig expire: deleting");
454 dns_rbtnodechain_invalidate(&chain);
455 (void)dns_rbt_deletename(ring->keys,
461 result = dns_rbtnodechain_next(&chain, &foundname,
463 if (result != ISC_R_SUCCESS && result != DNS_R_NEWORIGIN) {
464 dns_rbtnodechain_invalidate(&chain);
472 dns_tsigkey_create(dns_name_t *name, dns_name_t *algorithm,
473 unsigned char *secret, int length, isc_boolean_t generated,
474 dns_name_t *creator, isc_stdtime_t inception,
475 isc_stdtime_t expire, isc_mem_t *mctx,
476 dns_tsig_keyring_t *ring, dns_tsigkey_t **key)
478 dst_key_t *dstkey = NULL;
481 REQUIRE(length >= 0);
483 REQUIRE(secret != NULL);
485 if (dns_name_equal(algorithm, DNS_TSIG_HMACMD5_NAME)) {
486 if (secret != NULL) {
489 isc_buffer_init(&b, secret, length);
490 isc_buffer_add(&b, length);
491 result = dst_key_frombuffer(name, DST_ALG_HMACMD5,
496 if (result != ISC_R_SUCCESS)
499 } else if (dns_name_equal(algorithm, DNS_TSIG_HMACSHA1_NAME)) {
500 if (secret != NULL) {
503 isc_buffer_init(&b, secret, length);
504 isc_buffer_add(&b, length);
505 result = dst_key_frombuffer(name, DST_ALG_HMACSHA1,
510 if (result != ISC_R_SUCCESS)
513 } else if (dns_name_equal(algorithm, DNS_TSIG_HMACSHA224_NAME)) {
514 if (secret != NULL) {
517 isc_buffer_init(&b, secret, length);
518 isc_buffer_add(&b, length);
519 result = dst_key_frombuffer(name, DST_ALG_HMACSHA224,
524 if (result != ISC_R_SUCCESS)
527 } else if (dns_name_equal(algorithm, DNS_TSIG_HMACSHA256_NAME)) {
528 if (secret != NULL) {
531 isc_buffer_init(&b, secret, length);
532 isc_buffer_add(&b, length);
533 result = dst_key_frombuffer(name, DST_ALG_HMACSHA256,
538 if (result != ISC_R_SUCCESS)
541 } else if (dns_name_equal(algorithm, DNS_TSIG_HMACSHA384_NAME)) {
542 if (secret != NULL) {
545 isc_buffer_init(&b, secret, length);
546 isc_buffer_add(&b, length);
547 result = dst_key_frombuffer(name, DST_ALG_HMACSHA384,
552 if (result != ISC_R_SUCCESS)
555 } else if (dns_name_equal(algorithm, DNS_TSIG_HMACSHA512_NAME)) {
556 if (secret != NULL) {
559 isc_buffer_init(&b, secret, length);
560 isc_buffer_add(&b, length);
561 result = dst_key_frombuffer(name, DST_ALG_HMACSHA512,
566 if (result != ISC_R_SUCCESS)
569 } else if (length > 0)
570 return (DNS_R_BADALG);
572 result = dns_tsigkey_createfromkey(name, algorithm, dstkey,
574 inception, expire, mctx, ring, key);
575 if (result != ISC_R_SUCCESS && dstkey != NULL)
576 dst_key_free(&dstkey);
581 dns_tsigkey_attach(dns_tsigkey_t *source, dns_tsigkey_t **targetp) {
582 REQUIRE(VALID_TSIG_KEY(source));
583 REQUIRE(targetp != NULL && *targetp == NULL);
585 isc_refcount_increment(&source->refs, NULL);
590 tsigkey_free(dns_tsigkey_t *key) {
591 REQUIRE(VALID_TSIG_KEY(key));
594 dns_name_free(&key->name, key->mctx);
595 if (algname_is_allocated(key->algorithm)) {
596 dns_name_free(key->algorithm, key->mctx);
597 isc_mem_put(key->mctx, key->algorithm, sizeof(dns_name_t));
599 if (key->key != NULL)
600 dst_key_free(&key->key);
601 if (key->creator != NULL) {
602 dns_name_free(key->creator, key->mctx);
603 isc_mem_put(key->mctx, key->creator, sizeof(dns_name_t));
605 isc_refcount_destroy(&key->refs);
606 isc_mem_putanddetach(&key->mctx, key, sizeof(dns_tsigkey_t));
610 dns_tsigkey_detach(dns_tsigkey_t **keyp) {
614 REQUIRE(keyp != NULL);
615 REQUIRE(VALID_TSIG_KEY(*keyp));
618 isc_refcount_decrement(&key->refs, &refs);
627 dns_tsigkey_setdeleted(dns_tsigkey_t *key) {
628 REQUIRE(VALID_TSIG_KEY(key));
629 REQUIRE(key->ring != NULL);
631 RWLOCK(&key->ring->lock, isc_rwlocktype_write);
632 (void)dns_rbt_deletename(key->ring->keys, &key->name, ISC_FALSE);
633 RWUNLOCK(&key->ring->lock, isc_rwlocktype_write);
637 dns_tsig_sign(dns_message_t *msg) {
639 dns_rdata_any_tsig_t tsig, querytsig;
640 unsigned char data[128];
641 isc_buffer_t databuf, sigbuf;
642 isc_buffer_t *dynbuf;
644 dns_rdata_t *rdata = NULL;
645 dns_rdatalist_t *datalist;
646 dns_rdataset_t *dataset;
650 dst_context_t *ctx = NULL;
652 unsigned char badtimedata[BADTIMELEN];
653 unsigned int sigsize = 0;
655 REQUIRE(msg != NULL);
656 REQUIRE(VALID_TSIG_KEY(dns_message_gettsigkey(msg)));
659 * If this is a response, there should be a query tsig.
661 if (is_response(msg) && msg->querytsig == NULL)
662 return (DNS_R_EXPECTEDTSIG);
667 key = dns_message_gettsigkey(msg);
670 tsig.common.rdclass = dns_rdataclass_any;
671 tsig.common.rdtype = dns_rdatatype_tsig;
672 ISC_LINK_INIT(&tsig.common, link);
673 dns_name_init(&tsig.algorithm, NULL);
674 dns_name_clone(key->algorithm, &tsig.algorithm);
676 isc_stdtime_get(&now);
677 tsig.timesigned = now + msg->timeadjust;
678 tsig.fudge = DNS_TSIG_FUDGE;
680 tsig.originalid = msg->id;
682 isc_buffer_init(&databuf, data, sizeof(data));
684 if (is_response(msg))
685 tsig.error = msg->querytsigstatus;
687 tsig.error = dns_rcode_noerror;
689 if (tsig.error != dns_tsigerror_badtime) {
693 isc_buffer_t otherbuf;
695 tsig.otherlen = BADTIMELEN;
696 tsig.other = badtimedata;
697 isc_buffer_init(&otherbuf, tsig.other, tsig.otherlen);
698 isc_buffer_putuint48(&otherbuf, tsig.timesigned);
701 if (key->key != NULL && tsig.error != dns_tsigerror_badsig) {
702 unsigned char header[DNS_MESSAGE_HEADERLEN];
703 isc_buffer_t headerbuf;
704 isc_uint16_t digestbits;
706 ret = dst_context_create(key->key, mctx, &ctx);
707 if (ret != ISC_R_SUCCESS)
711 * If this is a response, digest the query signature.
713 if (is_response(msg)) {
714 dns_rdata_t querytsigrdata = DNS_RDATA_INIT;
716 ret = dns_rdataset_first(msg->querytsig);
717 if (ret != ISC_R_SUCCESS)
718 goto cleanup_context;
719 dns_rdataset_current(msg->querytsig, &querytsigrdata);
720 ret = dns_rdata_tostruct(&querytsigrdata, &querytsig,
722 if (ret != ISC_R_SUCCESS)
723 goto cleanup_context;
724 isc_buffer_putuint16(&databuf, querytsig.siglen);
725 if (isc_buffer_availablelength(&databuf) <
728 goto cleanup_context;
730 isc_buffer_putmem(&databuf, querytsig.signature,
732 isc_buffer_usedregion(&databuf, &r);
733 ret = dst_context_adddata(ctx, &r);
734 if (ret != ISC_R_SUCCESS)
735 goto cleanup_context;
741 isc_buffer_init(&headerbuf, header, sizeof(header));
742 dns_message_renderheader(msg, &headerbuf);
743 isc_buffer_usedregion(&headerbuf, &r);
744 ret = dst_context_adddata(ctx, &r);
745 if (ret != ISC_R_SUCCESS)
746 goto cleanup_context;
749 * Digest the remainder of the message.
751 isc_buffer_usedregion(msg->buffer, &r);
752 isc_region_consume(&r, DNS_MESSAGE_HEADERLEN);
753 ret = dst_context_adddata(ctx, &r);
754 if (ret != ISC_R_SUCCESS)
755 goto cleanup_context;
757 if (msg->tcp_continuation == 0) {
759 * Digest the name, class, ttl, alg.
761 dns_name_toregion(&key->name, &r);
762 ret = dst_context_adddata(ctx, &r);
763 if (ret != ISC_R_SUCCESS)
764 goto cleanup_context;
766 isc_buffer_clear(&databuf);
767 isc_buffer_putuint16(&databuf, dns_rdataclass_any);
768 isc_buffer_putuint32(&databuf, 0); /* ttl */
769 isc_buffer_usedregion(&databuf, &r);
770 ret = dst_context_adddata(ctx, &r);
771 if (ret != ISC_R_SUCCESS)
772 goto cleanup_context;
774 dns_name_toregion(&tsig.algorithm, &r);
775 ret = dst_context_adddata(ctx, &r);
776 if (ret != ISC_R_SUCCESS)
777 goto cleanup_context;
780 /* Digest the timesigned and fudge */
781 isc_buffer_clear(&databuf);
782 if (tsig.error == dns_tsigerror_badtime)
783 tsig.timesigned = querytsig.timesigned;
784 isc_buffer_putuint48(&databuf, tsig.timesigned);
785 isc_buffer_putuint16(&databuf, tsig.fudge);
786 isc_buffer_usedregion(&databuf, &r);
787 ret = dst_context_adddata(ctx, &r);
788 if (ret != ISC_R_SUCCESS)
789 goto cleanup_context;
791 if (msg->tcp_continuation == 0) {
793 * Digest the error and other data length.
795 isc_buffer_clear(&databuf);
796 isc_buffer_putuint16(&databuf, tsig.error);
797 isc_buffer_putuint16(&databuf, tsig.otherlen);
799 isc_buffer_usedregion(&databuf, &r);
800 ret = dst_context_adddata(ctx, &r);
801 if (ret != ISC_R_SUCCESS)
802 goto cleanup_context;
805 * Digest the error and other data.
807 if (tsig.otherlen > 0) {
808 r.length = tsig.otherlen;
810 ret = dst_context_adddata(ctx, &r);
811 if (ret != ISC_R_SUCCESS)
812 goto cleanup_context;
816 ret = dst_key_sigsize(key->key, &sigsize);
817 if (ret != ISC_R_SUCCESS)
818 goto cleanup_context;
819 tsig.signature = (unsigned char *) isc_mem_get(mctx, sigsize);
820 if (tsig.signature == NULL) {
821 ret = ISC_R_NOMEMORY;
822 goto cleanup_context;
825 isc_buffer_init(&sigbuf, tsig.signature, sigsize);
826 ret = dst_context_sign(ctx, &sigbuf);
827 if (ret != ISC_R_SUCCESS)
828 goto cleanup_signature;
829 dst_context_destroy(&ctx);
830 digestbits = dst_key_getbits(key->key);
831 if (digestbits != 0) {
832 unsigned int bytes = (digestbits + 1) / 8;
833 if (is_response(msg) && bytes < querytsig.siglen)
834 bytes = querytsig.siglen;
835 if (bytes > isc_buffer_usedlength(&sigbuf))
836 bytes = isc_buffer_usedlength(&sigbuf);
839 tsig.siglen = isc_buffer_usedlength(&sigbuf);
842 tsig.signature = NULL;
845 ret = dns_message_gettemprdata(msg, &rdata);
846 if (ret != ISC_R_SUCCESS)
847 goto cleanup_signature;
848 ret = isc_buffer_allocate(msg->mctx, &dynbuf, 512);
849 if (ret != ISC_R_SUCCESS)
851 ret = dns_rdata_fromstruct(rdata, dns_rdataclass_any,
852 dns_rdatatype_tsig, &tsig, dynbuf);
853 if (ret != ISC_R_SUCCESS)
856 dns_message_takebuffer(msg, &dynbuf);
858 if (tsig.signature != NULL) {
859 isc_mem_put(mctx, tsig.signature, sigsize);
860 tsig.signature = NULL;
864 ret = dns_message_gettempname(msg, &owner);
865 if (ret != ISC_R_SUCCESS)
867 dns_name_init(owner, NULL);
868 ret = dns_name_dup(&key->name, msg->mctx, owner);
869 if (ret != ISC_R_SUCCESS)
873 ret = dns_message_gettemprdatalist(msg, &datalist);
874 if (ret != ISC_R_SUCCESS)
877 ret = dns_message_gettemprdataset(msg, &dataset);
878 if (ret != ISC_R_SUCCESS)
879 goto cleanup_rdatalist;
880 datalist->rdclass = dns_rdataclass_any;
881 datalist->type = dns_rdatatype_tsig;
882 datalist->covers = 0;
884 ISC_LIST_INIT(datalist->rdata);
885 ISC_LIST_APPEND(datalist->rdata, rdata, link);
886 dns_rdataset_init(dataset);
887 RUNTIME_CHECK(dns_rdatalist_tordataset(datalist, dataset)
890 msg->tsigname = owner;
892 return (ISC_R_SUCCESS);
895 dns_message_puttemprdatalist(msg, &datalist);
897 dns_message_puttempname(msg, &owner);
900 isc_buffer_free(&dynbuf);
902 dns_message_puttemprdata(msg, &rdata);
904 if (tsig.signature != NULL)
905 isc_mem_put(mctx, tsig.signature, sigsize);
908 dst_context_destroy(&ctx);
913 dns_tsig_verify(isc_buffer_t *source, dns_message_t *msg,
914 dns_tsig_keyring_t *ring1, dns_tsig_keyring_t *ring2)
916 dns_rdata_any_tsig_t tsig, querytsig;
917 isc_region_t r, source_r, header_r, sig_r;
918 isc_buffer_t databuf;
919 unsigned char data[32];
921 dns_rdata_t rdata = DNS_RDATA_INIT;
924 dns_tsigkey_t *tsigkey;
925 dst_key_t *key = NULL;
926 unsigned char header[DNS_MESSAGE_HEADERLEN];
927 dst_context_t *ctx = NULL;
929 isc_uint16_t addcount, id;
933 REQUIRE(source != NULL);
934 REQUIRE(DNS_MESSAGE_VALID(msg));
935 tsigkey = dns_message_gettsigkey(msg);
937 REQUIRE(tsigkey == NULL || VALID_TSIG_KEY(tsigkey));
939 msg->verify_attempted = 1;
941 if (msg->tcp_continuation) {
942 if (tsigkey == NULL || msg->querytsig == NULL)
943 return (DNS_R_UNEXPECTEDTSIG);
944 return (tsig_verify_tcp(source, msg));
948 * There should be a TSIG record...
950 if (msg->tsig == NULL)
951 return (DNS_R_EXPECTEDTSIG);
954 * If this is a response and there's no key or query TSIG, there
955 * shouldn't be one on the response.
957 if (is_response(msg) &&
958 (tsigkey == NULL || msg->querytsig == NULL))
959 return (DNS_R_UNEXPECTEDTSIG);
964 * If we're here, we know the message is well formed and contains a
968 keyname = msg->tsigname;
969 ret = dns_rdataset_first(msg->tsig);
970 if (ret != ISC_R_SUCCESS)
972 dns_rdataset_current(msg->tsig, &rdata);
973 ret = dns_rdata_tostruct(&rdata, &tsig, NULL);
974 if (ret != ISC_R_SUCCESS)
976 dns_rdata_reset(&rdata);
977 if (is_response(msg)) {
978 ret = dns_rdataset_first(msg->querytsig);
979 if (ret != ISC_R_SUCCESS)
981 dns_rdataset_current(msg->querytsig, &rdata);
982 ret = dns_rdata_tostruct(&rdata, &querytsig, NULL);
983 if (ret != ISC_R_SUCCESS)
988 * Do the key name and algorithm match that of the query?
990 if (is_response(msg) &&
991 (!dns_name_equal(keyname, &tsigkey->name) ||
992 !dns_name_equal(&tsig.algorithm, &querytsig.algorithm))) {
993 msg->tsigstatus = dns_tsigerror_badkey;
994 tsig_log(msg->tsigkey, 2,
995 "key name and algorithm do not match");
996 return (DNS_R_TSIGVERIFYFAILURE);
1000 * Get the current time.
1002 isc_stdtime_get(&now);
1005 * Find dns_tsigkey_t based on keyname.
1007 if (tsigkey == NULL) {
1008 ret = ISC_R_NOTFOUND;
1010 ret = dns_tsigkey_find(&tsigkey, keyname,
1011 &tsig.algorithm, ring1);
1012 if (ret == ISC_R_NOTFOUND && ring2 != NULL)
1013 ret = dns_tsigkey_find(&tsigkey, keyname,
1014 &tsig.algorithm, ring2);
1015 if (ret != ISC_R_SUCCESS) {
1016 msg->tsigstatus = dns_tsigerror_badkey;
1017 ret = dns_tsigkey_create(keyname, &tsig.algorithm,
1018 NULL, 0, ISC_FALSE, NULL,
1020 mctx, NULL, &msg->tsigkey);
1021 if (ret != ISC_R_SUCCESS)
1023 tsig_log(msg->tsigkey, 2, "unknown key");
1024 return (DNS_R_TSIGVERIFYFAILURE);
1026 msg->tsigkey = tsigkey;
1034 if (now + msg->timeadjust > tsig.timesigned + tsig.fudge) {
1035 msg->tsigstatus = dns_tsigerror_badtime;
1036 tsig_log(msg->tsigkey, 2, "signature has expired");
1037 return (DNS_R_CLOCKSKEW);
1038 } else if (now + msg->timeadjust < tsig.timesigned - tsig.fudge) {
1039 msg->tsigstatus = dns_tsigerror_badtime;
1040 tsig_log(msg->tsigkey, 2, "signature is in the future");
1041 return (DNS_R_CLOCKSKEW);
1045 * Check digest length.
1047 alg = dst_key_alg(key);
1048 ret = dst_key_sigsize(key, &siglen);
1049 if (ret != ISC_R_SUCCESS)
1051 if (alg == DST_ALG_HMACMD5 || alg == DST_ALG_HMACSHA1 ||
1052 alg == DST_ALG_HMACSHA224 || alg == DST_ALG_HMACSHA256 ||
1053 alg == DST_ALG_HMACSHA384 || alg == DST_ALG_HMACSHA512) {
1054 isc_uint16_t digestbits = dst_key_getbits(key);
1055 if (tsig.siglen > siglen) {
1056 tsig_log(msg->tsigkey, 2, "signature length to big");
1057 return (DNS_R_FORMERR);
1059 if (tsig.siglen > 0 &&
1060 (tsig.siglen < 10 || tsig.siglen < ((siglen + 1) / 2))) {
1061 tsig_log(msg->tsigkey, 2,
1062 "signature length below minimum");
1063 return (DNS_R_FORMERR);
1065 if (tsig.siglen > 0 && digestbits != 0 &&
1066 tsig.siglen < ((digestbits + 1) / 8)) {
1067 msg->tsigstatus = dns_tsigerror_badtrunc;
1068 tsig_log(msg->tsigkey, 2,
1069 "truncated signature length too small");
1070 return (DNS_R_TSIGVERIFYFAILURE);
1072 if (tsig.siglen > 0 && digestbits == 0 &&
1073 tsig.siglen < siglen) {
1074 msg->tsigstatus = dns_tsigerror_badtrunc;
1075 tsig_log(msg->tsigkey, 2, "signature length too small");
1076 return (DNS_R_TSIGVERIFYFAILURE);
1080 if (tsig.siglen > 0) {
1081 sig_r.base = tsig.signature;
1082 sig_r.length = tsig.siglen;
1084 ret = dst_context_create(key, mctx, &ctx);
1085 if (ret != ISC_R_SUCCESS)
1088 if (is_response(msg)) {
1089 isc_buffer_init(&databuf, data, sizeof(data));
1090 isc_buffer_putuint16(&databuf, querytsig.siglen);
1091 isc_buffer_usedregion(&databuf, &r);
1092 ret = dst_context_adddata(ctx, &r);
1093 if (ret != ISC_R_SUCCESS)
1094 goto cleanup_context;
1095 if (querytsig.siglen > 0) {
1096 r.length = querytsig.siglen;
1097 r.base = querytsig.signature;
1098 ret = dst_context_adddata(ctx, &r);
1099 if (ret != ISC_R_SUCCESS)
1100 goto cleanup_context;
1105 * Extract the header.
1107 isc_buffer_usedregion(source, &r);
1108 memcpy(header, r.base, DNS_MESSAGE_HEADERLEN);
1109 isc_region_consume(&r, DNS_MESSAGE_HEADERLEN);
1112 * Decrement the additional field counter.
1114 memcpy(&addcount, &header[DNS_MESSAGE_HEADERLEN - 2], 2);
1115 addcount = htons((isc_uint16_t)(ntohs(addcount) - 1));
1116 memcpy(&header[DNS_MESSAGE_HEADERLEN - 2], &addcount, 2);
1119 * Put in the original id.
1121 id = htons(tsig.originalid);
1122 memcpy(&header[0], &id, 2);
1125 * Digest the modified header.
1127 header_r.base = (unsigned char *) header;
1128 header_r.length = DNS_MESSAGE_HEADERLEN;
1129 ret = dst_context_adddata(ctx, &header_r);
1130 if (ret != ISC_R_SUCCESS)
1131 goto cleanup_context;
1134 * Digest all non-TSIG records.
1136 isc_buffer_usedregion(source, &source_r);
1137 r.base = source_r.base + DNS_MESSAGE_HEADERLEN;
1138 r.length = msg->sigstart - DNS_MESSAGE_HEADERLEN;
1139 ret = dst_context_adddata(ctx, &r);
1140 if (ret != ISC_R_SUCCESS)
1141 goto cleanup_context;
1144 * Digest the key name.
1146 dns_name_toregion(&tsigkey->name, &r);
1147 ret = dst_context_adddata(ctx, &r);
1148 if (ret != ISC_R_SUCCESS)
1149 goto cleanup_context;
1151 isc_buffer_init(&databuf, data, sizeof(data));
1152 isc_buffer_putuint16(&databuf, tsig.common.rdclass);
1153 isc_buffer_putuint32(&databuf, msg->tsig->ttl);
1154 isc_buffer_usedregion(&databuf, &r);
1155 ret = dst_context_adddata(ctx, &r);
1156 if (ret != ISC_R_SUCCESS)
1157 goto cleanup_context;
1160 * Digest the key algorithm.
1162 dns_name_toregion(tsigkey->algorithm, &r);
1163 ret = dst_context_adddata(ctx, &r);
1164 if (ret != ISC_R_SUCCESS)
1165 goto cleanup_context;
1167 isc_buffer_clear(&databuf);
1168 isc_buffer_putuint48(&databuf, tsig.timesigned);
1169 isc_buffer_putuint16(&databuf, tsig.fudge);
1170 isc_buffer_putuint16(&databuf, tsig.error);
1171 isc_buffer_putuint16(&databuf, tsig.otherlen);
1172 isc_buffer_usedregion(&databuf, &r);
1173 ret = dst_context_adddata(ctx, &r);
1174 if (ret != ISC_R_SUCCESS)
1175 goto cleanup_context;
1177 if (tsig.otherlen > 0) {
1178 r.base = tsig.other;
1179 r.length = tsig.otherlen;
1180 ret = dst_context_adddata(ctx, &r);
1181 if (ret != ISC_R_SUCCESS)
1182 goto cleanup_context;
1185 ret = dst_context_verify(ctx, &sig_r);
1186 if (ret == DST_R_VERIFYFAILURE) {
1187 msg->tsigstatus = dns_tsigerror_badsig;
1188 ret = DNS_R_TSIGVERIFYFAILURE;
1189 tsig_log(msg->tsigkey, 2,
1190 "signature failed to verify(1)");
1191 goto cleanup_context;
1192 } else if (ret != ISC_R_SUCCESS)
1193 goto cleanup_context;
1195 dst_context_destroy(&ctx);
1196 } else if (tsig.error != dns_tsigerror_badsig &&
1197 tsig.error != dns_tsigerror_badkey) {
1198 msg->tsigstatus = dns_tsigerror_badsig;
1199 tsig_log(msg->tsigkey, 2, "signature was empty");
1200 return (DNS_R_TSIGVERIFYFAILURE);
1203 msg->tsigstatus = dns_rcode_noerror;
1205 if (tsig.error != dns_rcode_noerror) {
1206 if (tsig.error == dns_tsigerror_badtime)
1207 return (DNS_R_CLOCKSKEW);
1209 return (DNS_R_TSIGERRORSET);
1212 msg->verified_sig = 1;
1214 return (ISC_R_SUCCESS);
1218 dst_context_destroy(&ctx);
1224 tsig_verify_tcp(isc_buffer_t *source, dns_message_t *msg) {
1225 dns_rdata_any_tsig_t tsig, querytsig;
1226 isc_region_t r, source_r, header_r, sig_r;
1227 isc_buffer_t databuf;
1228 unsigned char data[32];
1229 dns_name_t *keyname;
1230 dns_rdata_t rdata = DNS_RDATA_INIT;
1233 dns_tsigkey_t *tsigkey;
1234 dst_key_t *key = NULL;
1235 unsigned char header[DNS_MESSAGE_HEADERLEN];
1236 isc_uint16_t addcount, id;
1237 isc_boolean_t has_tsig = ISC_FALSE;
1240 REQUIRE(source != NULL);
1241 REQUIRE(msg != NULL);
1242 REQUIRE(dns_message_gettsigkey(msg) != NULL);
1243 REQUIRE(msg->tcp_continuation == 1);
1244 REQUIRE(msg->querytsig != NULL);
1246 if (!is_response(msg))
1247 return (DNS_R_EXPECTEDRESPONSE);
1251 tsigkey = dns_message_gettsigkey(msg);
1254 * Extract and parse the previous TSIG
1256 ret = dns_rdataset_first(msg->querytsig);
1257 if (ret != ISC_R_SUCCESS)
1259 dns_rdataset_current(msg->querytsig, &rdata);
1260 ret = dns_rdata_tostruct(&rdata, &querytsig, NULL);
1261 if (ret != ISC_R_SUCCESS)
1263 dns_rdata_reset(&rdata);
1266 * If there is a TSIG in this message, do some checks.
1268 if (msg->tsig != NULL) {
1269 has_tsig = ISC_TRUE;
1271 keyname = msg->tsigname;
1272 ret = dns_rdataset_first(msg->tsig);
1273 if (ret != ISC_R_SUCCESS)
1274 goto cleanup_querystruct;
1275 dns_rdataset_current(msg->tsig, &rdata);
1276 ret = dns_rdata_tostruct(&rdata, &tsig, NULL);
1277 if (ret != ISC_R_SUCCESS)
1278 goto cleanup_querystruct;
1281 * Do the key name and algorithm match that of the query?
1283 if (!dns_name_equal(keyname, &tsigkey->name) ||
1284 !dns_name_equal(&tsig.algorithm, &querytsig.algorithm)) {
1285 msg->tsigstatus = dns_tsigerror_badkey;
1286 ret = DNS_R_TSIGVERIFYFAILURE;
1287 tsig_log(msg->tsigkey, 2,
1288 "key name and algorithm do not match");
1289 goto cleanup_querystruct;
1295 isc_stdtime_get(&now);
1297 if (now + msg->timeadjust > tsig.timesigned + tsig.fudge) {
1298 msg->tsigstatus = dns_tsigerror_badtime;
1299 tsig_log(msg->tsigkey, 2, "signature has expired");
1300 ret = DNS_R_CLOCKSKEW;
1301 goto cleanup_querystruct;
1302 } else if (now + msg->timeadjust <
1303 tsig.timesigned - tsig.fudge) {
1304 msg->tsigstatus = dns_tsigerror_badtime;
1305 tsig_log(msg->tsigkey, 2,
1306 "signature is in the future");
1307 ret = DNS_R_CLOCKSKEW;
1308 goto cleanup_querystruct;
1314 if (msg->tsigctx == NULL) {
1315 ret = dst_context_create(key, mctx, &msg->tsigctx);
1316 if (ret != ISC_R_SUCCESS)
1317 goto cleanup_querystruct;
1320 * Digest the length of the query signature
1322 isc_buffer_init(&databuf, data, sizeof(data));
1323 isc_buffer_putuint16(&databuf, querytsig.siglen);
1324 isc_buffer_usedregion(&databuf, &r);
1325 ret = dst_context_adddata(msg->tsigctx, &r);
1326 if (ret != ISC_R_SUCCESS)
1327 goto cleanup_context;
1330 * Digest the data of the query signature
1332 if (querytsig.siglen > 0) {
1333 r.length = querytsig.siglen;
1334 r.base = querytsig.signature;
1335 ret = dst_context_adddata(msg->tsigctx, &r);
1336 if (ret != ISC_R_SUCCESS)
1337 goto cleanup_context;
1342 * Extract the header.
1344 isc_buffer_usedregion(source, &r);
1345 memcpy(header, r.base, DNS_MESSAGE_HEADERLEN);
1346 isc_region_consume(&r, DNS_MESSAGE_HEADERLEN);
1349 * Decrement the additional field counter if necessary.
1352 memcpy(&addcount, &header[DNS_MESSAGE_HEADERLEN - 2], 2);
1353 addcount = htons((isc_uint16_t)(ntohs(addcount) - 1));
1354 memcpy(&header[DNS_MESSAGE_HEADERLEN - 2], &addcount, 2);
1358 * Put in the original id.
1360 /* XXX Can TCP transfers be forwarded? How would that work? */
1362 id = htons(tsig.originalid);
1363 memcpy(&header[0], &id, 2);
1367 * Digest the modified header.
1369 header_r.base = (unsigned char *) header;
1370 header_r.length = DNS_MESSAGE_HEADERLEN;
1371 ret = dst_context_adddata(msg->tsigctx, &header_r);
1372 if (ret != ISC_R_SUCCESS)
1373 goto cleanup_context;
1376 * Digest all non-TSIG records.
1378 isc_buffer_usedregion(source, &source_r);
1379 r.base = source_r.base + DNS_MESSAGE_HEADERLEN;
1381 r.length = msg->sigstart - DNS_MESSAGE_HEADERLEN;
1383 r.length = source_r.length - DNS_MESSAGE_HEADERLEN;
1384 ret = dst_context_adddata(msg->tsigctx, &r);
1385 if (ret != ISC_R_SUCCESS)
1386 goto cleanup_context;
1389 * Digest the time signed and fudge.
1392 isc_buffer_init(&databuf, data, sizeof(data));
1393 isc_buffer_putuint48(&databuf, tsig.timesigned);
1394 isc_buffer_putuint16(&databuf, tsig.fudge);
1395 isc_buffer_usedregion(&databuf, &r);
1396 ret = dst_context_adddata(msg->tsigctx, &r);
1397 if (ret != ISC_R_SUCCESS)
1398 goto cleanup_context;
1400 sig_r.base = tsig.signature;
1401 sig_r.length = tsig.siglen;
1402 if (tsig.siglen == 0) {
1403 if (tsig.error != dns_rcode_noerror) {
1404 if (tsig.error == dns_tsigerror_badtime)
1405 ret = DNS_R_CLOCKSKEW;
1407 ret = DNS_R_TSIGERRORSET;
1409 tsig_log(msg->tsigkey, 2,
1410 "signature is empty");
1411 ret = DNS_R_TSIGVERIFYFAILURE;
1413 goto cleanup_context;
1416 ret = dst_context_verify(msg->tsigctx, &sig_r);
1417 if (ret == DST_R_VERIFYFAILURE) {
1418 msg->tsigstatus = dns_tsigerror_badsig;
1419 tsig_log(msg->tsigkey, 2,
1420 "signature failed to verify(2)");
1421 ret = DNS_R_TSIGVERIFYFAILURE;
1422 goto cleanup_context;
1424 else if (ret != ISC_R_SUCCESS)
1425 goto cleanup_context;
1427 dst_context_destroy(&msg->tsigctx);
1430 msg->tsigstatus = dns_rcode_noerror;
1431 return (ISC_R_SUCCESS);
1434 dst_context_destroy(&msg->tsigctx);
1436 cleanup_querystruct:
1437 dns_rdata_freestruct(&querytsig);
1444 dns_tsigkey_find(dns_tsigkey_t **tsigkey, dns_name_t *name,
1445 dns_name_t *algorithm, dns_tsig_keyring_t *ring)
1449 isc_result_t result;
1451 REQUIRE(tsigkey != NULL);
1452 REQUIRE(*tsigkey == NULL);
1453 REQUIRE(name != NULL);
1454 REQUIRE(ring != NULL);
1456 RWLOCK(&ring->lock, isc_rwlocktype_write);
1458 RWUNLOCK(&ring->lock, isc_rwlocktype_write);
1460 isc_stdtime_get(&now);
1461 RWLOCK(&ring->lock, isc_rwlocktype_read);
1463 result = dns_rbt_findname(ring->keys, name, 0, NULL, (void *)&key);
1464 if (result == DNS_R_PARTIALMATCH || result == ISC_R_NOTFOUND) {
1465 RWUNLOCK(&ring->lock, isc_rwlocktype_read);
1466 return (ISC_R_NOTFOUND);
1468 if (algorithm != NULL && !dns_name_equal(key->algorithm, algorithm)) {
1469 RWUNLOCK(&ring->lock, isc_rwlocktype_read);
1470 return (ISC_R_NOTFOUND);
1472 if (key->inception != key->expire && key->expire < now) {
1474 * The key has expired.
1476 RWUNLOCK(&ring->lock, isc_rwlocktype_read);
1477 RWLOCK(&ring->lock, isc_rwlocktype_write);
1478 (void)dns_rbt_deletename(ring->keys, name, ISC_FALSE);
1479 RWUNLOCK(&ring->lock, isc_rwlocktype_write);
1480 return (ISC_R_NOTFOUND);
1483 isc_refcount_increment(&key->refs, NULL);
1484 RWUNLOCK(&ring->lock, isc_rwlocktype_read);
1486 return (ISC_R_SUCCESS);
1490 free_tsignode(void *node, void *_unused) {
1495 REQUIRE(node != NULL);
1498 dns_tsigkey_detach(&key);
1502 dns_tsigkeyring_create(isc_mem_t *mctx, dns_tsig_keyring_t **ringp) {
1503 isc_result_t result;
1504 dns_tsig_keyring_t *ring;
1506 REQUIRE(mctx != NULL);
1507 REQUIRE(ringp != NULL);
1508 REQUIRE(*ringp == NULL);
1510 ring = isc_mem_get(mctx, sizeof(dns_tsig_keyring_t));
1512 return (ISC_R_NOMEMORY);
1514 result = isc_rwlock_init(&ring->lock, 0, 0);
1515 if (result != ISC_R_SUCCESS) {
1516 isc_mem_put(mctx, ring, sizeof(dns_tsig_keyring_t));
1521 result = dns_rbt_create(mctx, free_tsignode, NULL, &ring->keys);
1522 if (result != ISC_R_SUCCESS) {
1523 isc_rwlock_destroy(&ring->lock);
1524 isc_mem_put(mctx, ring, sizeof(dns_tsig_keyring_t));
1528 ring->writecount = 0;
1530 isc_mem_attach(mctx, &ring->mctx);
1533 return (ISC_R_SUCCESS);
1537 dns_tsigkeyring_destroy(dns_tsig_keyring_t **ringp) {
1538 dns_tsig_keyring_t *ring;
1540 REQUIRE(ringp != NULL);
1541 REQUIRE(*ringp != NULL);
1546 dns_rbt_destroy(&ring->keys);
1547 isc_rwlock_destroy(&ring->lock);
1548 isc_mem_putanddetach(&ring->mctx, ring, sizeof(dns_tsig_keyring_t));