2 * Portions Copyright (C) 2004-2009 Internet Systems Consortium, Inc. ("ISC")
3 * Portions Copyright (C) 1999-2003 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 AND NETWORK ASSOCIATES DISCLAIMS
10 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
11 * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE
12 * FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
15 * IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 * Portions Copyright (C) 1995-2000 by Network Associates, Inc.
19 * Permission to use, copy, modify, and/or distribute this software for any
20 * purpose with or without fee is hereby granted, provided that the above
21 * copyright notice and this permission notice appear in all copies.
23 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC AND NETWORK ASSOCIATES DISCLAIMS
24 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
25 * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE
26 * FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
27 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
28 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
29 * IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
33 * Principal Author: Brian Wellington
34 * $Id: dst_api.c,v 1.11.92.7 2009/07/29 23:55:00 each Exp $
43 #include <isc/buffer.h>
45 #include <isc/entropy.h>
46 #include <isc/fsaccess.h>
47 #include <isc/hmacsha.h>
51 #include <isc/print.h>
52 #include <isc/random.h>
53 #include <isc/string.h>
57 #include <dns/fixedname.h>
58 #include <dns/keyvalues.h>
60 #include <dns/rdata.h>
61 #include <dns/rdataclass.h>
63 #include <dns/types.h>
65 #include <dst/result.h>
67 #include "dst_internal.h"
69 #define DST_AS_STR(t) ((t).value.as_textregion.base)
71 static dst_func_t *dst_t_func[DST_MAX_ALGS];
72 static isc_entropy_t *dst_entropy_pool = NULL;
73 static unsigned int dst_entropy_flags = 0;
74 static isc_boolean_t dst_initialized = ISC_FALSE;
76 void gss_log(int level, const char *fmt, ...) ISC_FORMAT_PRINTF(2, 3);
78 isc_mem_t *dst__memory_pool = NULL;
83 static dst_key_t * get_key_struct(dns_name_t *name,
86 unsigned int protocol,
88 dns_rdataclass_t rdclass,
90 static isc_result_t write_public_key(const dst_key_t *key, int type,
91 const char *directory);
92 static isc_result_t buildfilename(dns_name_t *name,
96 const char *directory,
98 static isc_result_t computeid(dst_key_t *key);
99 static isc_result_t frombuffer(dns_name_t *name,
102 unsigned int protocol,
103 dns_rdataclass_t rdclass,
104 isc_buffer_t *source,
108 static isc_result_t algorithm_status(unsigned int alg);
110 static isc_result_t addsuffix(char *filename, unsigned int len,
111 const char *ofilename, const char *suffix);
116 if (result != ISC_R_SUCCESS) \
120 #define CHECKALG(alg) \
123 _r = algorithm_status(alg); \
124 if (_r != ISC_R_SUCCESS) \
130 default_memalloc(void *arg, size_t size) {
134 return (malloc(size));
138 default_memfree(void *arg, void *ptr) {
145 dst_lib_init(isc_mem_t *mctx, isc_entropy_t *ectx, unsigned int eflags) {
148 REQUIRE(mctx != NULL && ectx != NULL);
149 REQUIRE(dst_initialized == ISC_FALSE);
151 dst__memory_pool = NULL;
156 * When using --with-openssl, there seems to be no good way of not
157 * leaking memory due to the openssl error handling mechanism.
158 * Avoid assertions by using a local memory context and not checking
159 * for leaks on exit. Note: as there are leaks we cannot use
160 * ISC_MEMFLAG_INTERNAL as it will free up memory still being used
163 result = isc_mem_createx2(0, 0, default_memalloc, default_memfree,
164 NULL, &dst__memory_pool, 0);
165 if (result != ISC_R_SUCCESS)
167 isc_mem_setname(dst__memory_pool, "dst", NULL);
168 isc_mem_setdestroycheck(dst__memory_pool, ISC_FALSE);
170 isc_mem_attach(mctx, &dst__memory_pool);
172 isc_entropy_attach(ectx, &dst_entropy_pool);
173 dst_entropy_flags = eflags;
175 dst_result_register();
177 memset(dst_t_func, 0, sizeof(dst_t_func));
178 RETERR(dst__hmacmd5_init(&dst_t_func[DST_ALG_HMACMD5]));
179 RETERR(dst__hmacsha1_init(&dst_t_func[DST_ALG_HMACSHA1]));
180 RETERR(dst__hmacsha224_init(&dst_t_func[DST_ALG_HMACSHA224]));
181 RETERR(dst__hmacsha256_init(&dst_t_func[DST_ALG_HMACSHA256]));
182 RETERR(dst__hmacsha384_init(&dst_t_func[DST_ALG_HMACSHA384]));
183 RETERR(dst__hmacsha512_init(&dst_t_func[DST_ALG_HMACSHA512]));
185 RETERR(dst__openssl_init());
186 RETERR(dst__opensslrsa_init(&dst_t_func[DST_ALG_RSAMD5]));
187 RETERR(dst__opensslrsa_init(&dst_t_func[DST_ALG_RSASHA1]));
188 #ifdef HAVE_OPENSSL_DSA
189 RETERR(dst__openssldsa_init(&dst_t_func[DST_ALG_DSA]));
191 RETERR(dst__openssldh_init(&dst_t_func[DST_ALG_DH]));
194 RETERR(dst__gssapi_init(&dst_t_func[DST_ALG_GSSAPI]));
196 dst_initialized = ISC_TRUE;
197 return (ISC_R_SUCCESS);
205 dst_lib_destroy(void) {
207 RUNTIME_CHECK(dst_initialized == ISC_TRUE);
208 dst_initialized = ISC_FALSE;
210 for (i = 0; i < DST_MAX_ALGS; i++)
211 if (dst_t_func[i] != NULL && dst_t_func[i]->cleanup != NULL)
212 dst_t_func[i]->cleanup();
214 dst__openssl_destroy();
216 if (dst__memory_pool != NULL)
217 isc_mem_detach(&dst__memory_pool);
218 if (dst_entropy_pool != NULL)
219 isc_entropy_detach(&dst_entropy_pool);
224 dst_algorithm_supported(unsigned int alg) {
225 REQUIRE(dst_initialized == ISC_TRUE);
227 if (alg >= DST_MAX_ALGS || dst_t_func[alg] == NULL)
233 dst_context_create(dst_key_t *key, isc_mem_t *mctx, dst_context_t **dctxp) {
237 REQUIRE(dst_initialized == ISC_TRUE);
238 REQUIRE(VALID_KEY(key));
239 REQUIRE(mctx != NULL);
240 REQUIRE(dctxp != NULL && *dctxp == NULL);
242 if (key->func->createctx == NULL)
243 return (DST_R_UNSUPPORTEDALG);
244 if (key->keydata.generic == NULL)
245 return (DST_R_NULLKEY);
247 dctx = isc_mem_get(mctx, sizeof(dst_context_t));
249 return (ISC_R_NOMEMORY);
252 result = key->func->createctx(key, dctx);
253 if (result != ISC_R_SUCCESS) {
254 isc_mem_put(mctx, dctx, sizeof(dst_context_t));
257 dctx->magic = CTX_MAGIC;
259 return (ISC_R_SUCCESS);
263 dst_context_destroy(dst_context_t **dctxp) {
266 REQUIRE(dctxp != NULL && VALID_CTX(*dctxp));
269 INSIST(dctx->key->func->destroyctx != NULL);
270 dctx->key->func->destroyctx(dctx);
272 isc_mem_put(dctx->mctx, dctx, sizeof(dst_context_t));
277 dst_context_adddata(dst_context_t *dctx, const isc_region_t *data) {
278 REQUIRE(VALID_CTX(dctx));
279 REQUIRE(data != NULL);
280 INSIST(dctx->key->func->adddata != NULL);
282 return (dctx->key->func->adddata(dctx, data));
286 dst_context_sign(dst_context_t *dctx, isc_buffer_t *sig) {
289 REQUIRE(VALID_CTX(dctx));
290 REQUIRE(sig != NULL);
293 CHECKALG(key->key_alg);
294 if (key->keydata.generic == NULL)
295 return (DST_R_NULLKEY);
296 if (key->func->sign == NULL)
297 return (DST_R_NOTPRIVATEKEY);
298 if (key->func->isprivate == NULL ||
299 key->func->isprivate(key) == ISC_FALSE)
300 return (DST_R_NOTPRIVATEKEY);
302 return (key->func->sign(dctx, sig));
306 dst_context_verify(dst_context_t *dctx, isc_region_t *sig) {
307 REQUIRE(VALID_CTX(dctx));
308 REQUIRE(sig != NULL);
310 CHECKALG(dctx->key->key_alg);
311 if (dctx->key->keydata.generic == NULL)
312 return (DST_R_NULLKEY);
313 if (dctx->key->func->verify == NULL)
314 return (DST_R_NOTPUBLICKEY);
316 return (dctx->key->func->verify(dctx, sig));
320 dst_key_computesecret(const dst_key_t *pub, const dst_key_t *priv,
321 isc_buffer_t *secret)
323 REQUIRE(dst_initialized == ISC_TRUE);
324 REQUIRE(VALID_KEY(pub) && VALID_KEY(priv));
325 REQUIRE(secret != NULL);
327 CHECKALG(pub->key_alg);
328 CHECKALG(priv->key_alg);
330 if (pub->keydata.generic == NULL || priv->keydata.generic == NULL)
331 return (DST_R_NULLKEY);
333 if (pub->key_alg != priv->key_alg ||
334 pub->func->computesecret == NULL ||
335 priv->func->computesecret == NULL)
336 return (DST_R_KEYCANNOTCOMPUTESECRET);
338 if (dst_key_isprivate(priv) == ISC_FALSE)
339 return (DST_R_NOTPRIVATEKEY);
341 return (pub->func->computesecret(pub, priv, secret));
345 dst_key_tofile(const dst_key_t *key, int type, const char *directory) {
346 isc_result_t ret = ISC_R_SUCCESS;
348 REQUIRE(dst_initialized == ISC_TRUE);
349 REQUIRE(VALID_KEY(key));
350 REQUIRE((type & (DST_TYPE_PRIVATE | DST_TYPE_PUBLIC)) != 0);
352 CHECKALG(key->key_alg);
354 if (key->func->tofile == NULL)
355 return (DST_R_UNSUPPORTEDALG);
357 if (type & DST_TYPE_PUBLIC) {
358 ret = write_public_key(key, type, directory);
359 if (ret != ISC_R_SUCCESS)
363 if ((type & DST_TYPE_PRIVATE) &&
364 (key->key_flags & DNS_KEYFLAG_TYPEMASK) != DNS_KEYTYPE_NOKEY)
365 return (key->func->tofile(key, directory));
367 return (ISC_R_SUCCESS);
371 dst_key_fromfile(dns_name_t *name, dns_keytag_t id,
372 unsigned int alg, int type, const char *directory,
373 isc_mem_t *mctx, dst_key_t **keyp)
375 char filename[ISC_DIR_NAMEMAX];
380 REQUIRE(dst_initialized == ISC_TRUE);
381 REQUIRE(dns_name_isabsolute(name));
382 REQUIRE((type & (DST_TYPE_PRIVATE | DST_TYPE_PUBLIC)) != 0);
383 REQUIRE(mctx != NULL);
384 REQUIRE(keyp != NULL && *keyp == NULL);
388 isc_buffer_init(&b, filename, sizeof(filename));
389 result = buildfilename(name, id, alg, type, directory, &b);
390 if (result != ISC_R_SUCCESS)
394 result = dst_key_fromnamedfile(filename, type, mctx, &key);
395 if (result != ISC_R_SUCCESS)
398 result = computeid(key);
399 if (result != ISC_R_SUCCESS) {
404 if (!dns_name_equal(name, key->key_name) || id != key->key_id ||
405 alg != key->key_alg) {
407 return (DST_R_INVALIDPRIVATEKEY);
412 return (ISC_R_SUCCESS);
416 dst_key_fromnamedfile(const char *filename, int type, isc_mem_t *mctx,
420 dst_key_t *pubkey = NULL, *key = NULL;
422 char *newfilename = NULL;
423 int newfilenamelen = 0;
424 isc_lex_t *lex = NULL;
426 REQUIRE(dst_initialized == ISC_TRUE);
427 REQUIRE(filename != NULL);
428 REQUIRE((type & (DST_TYPE_PRIVATE | DST_TYPE_PUBLIC)) != 0);
429 REQUIRE(mctx != NULL);
430 REQUIRE(keyp != NULL && *keyp == NULL);
432 newfilenamelen = strlen(filename) + 5;
433 newfilename = isc_mem_get(mctx, newfilenamelen);
434 if (newfilename == NULL)
435 return (ISC_R_NOMEMORY);
436 result = addsuffix(newfilename, newfilenamelen, filename, ".key");
437 INSIST(result == ISC_R_SUCCESS);
439 result = dst_key_read_public(newfilename, type, mctx, &pubkey);
440 isc_mem_put(mctx, newfilename, newfilenamelen);
442 if (result != ISC_R_SUCCESS)
445 if ((type & (DST_TYPE_PRIVATE | DST_TYPE_PUBLIC)) == DST_TYPE_PUBLIC ||
446 (pubkey->key_flags & DNS_KEYFLAG_TYPEMASK) == DNS_KEYTYPE_NOKEY) {
447 result = computeid(pubkey);
448 if (result != ISC_R_SUCCESS) {
449 dst_key_free(&pubkey);
454 return (ISC_R_SUCCESS);
457 result = algorithm_status(pubkey->key_alg);
458 if (result != ISC_R_SUCCESS) {
459 dst_key_free(&pubkey);
463 key = get_key_struct(pubkey->key_name, pubkey->key_alg,
464 pubkey->key_flags, pubkey->key_proto, 0,
465 pubkey->key_class, mctx);
467 dst_key_free(&pubkey);
470 return (ISC_R_NOMEMORY);
472 if (key->func->parse == NULL)
473 RETERR(DST_R_UNSUPPORTEDALG);
475 newfilenamelen = strlen(filename) + 9;
476 newfilename = isc_mem_get(mctx, newfilenamelen);
477 if (newfilename == NULL)
478 RETERR(ISC_R_NOMEMORY);
479 result = addsuffix(newfilename, newfilenamelen, filename, ".private");
480 INSIST(result == ISC_R_SUCCESS);
482 RETERR(isc_lex_create(mctx, 1500, &lex));
483 RETERR(isc_lex_openfile(lex, newfilename));
484 isc_mem_put(mctx, newfilename, newfilenamelen);
486 RETERR(key->func->parse(key, lex));
487 isc_lex_destroy(&lex);
489 RETERR(computeid(key));
491 if (id != key->key_id)
492 RETERR(DST_R_INVALIDPRIVATEKEY);
495 return (ISC_R_SUCCESS);
497 if (newfilename != NULL)
498 isc_mem_put(mctx, newfilename, newfilenamelen);
500 isc_lex_destroy(&lex);
506 dst_key_todns(const dst_key_t *key, isc_buffer_t *target) {
507 REQUIRE(dst_initialized == ISC_TRUE);
508 REQUIRE(VALID_KEY(key));
509 REQUIRE(target != NULL);
511 CHECKALG(key->key_alg);
513 if (key->func->todns == NULL)
514 return (DST_R_UNSUPPORTEDALG);
516 if (isc_buffer_availablelength(target) < 4)
517 return (ISC_R_NOSPACE);
518 isc_buffer_putuint16(target, (isc_uint16_t)(key->key_flags & 0xffff));
519 isc_buffer_putuint8(target, (isc_uint8_t)key->key_proto);
520 isc_buffer_putuint8(target, (isc_uint8_t)key->key_alg);
522 if (key->key_flags & DNS_KEYFLAG_EXTENDED) {
523 if (isc_buffer_availablelength(target) < 2)
524 return (ISC_R_NOSPACE);
525 isc_buffer_putuint16(target,
526 (isc_uint16_t)((key->key_flags >> 16)
530 if (key->keydata.generic == NULL) /*%< NULL KEY */
531 return (ISC_R_SUCCESS);
533 return (key->func->todns(key, target));
537 dst_key_fromdns(dns_name_t *name, dns_rdataclass_t rdclass,
538 isc_buffer_t *source, isc_mem_t *mctx, dst_key_t **keyp)
540 isc_uint8_t alg, proto;
541 isc_uint32_t flags, extflags;
542 dst_key_t *key = NULL;
547 REQUIRE(dst_initialized);
549 isc_buffer_remainingregion(source, &r);
551 if (isc_buffer_remaininglength(source) < 4)
552 return (DST_R_INVALIDPUBLICKEY);
553 flags = isc_buffer_getuint16(source);
554 proto = isc_buffer_getuint8(source);
555 alg = isc_buffer_getuint8(source);
557 id = dst_region_computeid(&r, alg);
559 if (flags & DNS_KEYFLAG_EXTENDED) {
560 if (isc_buffer_remaininglength(source) < 2)
561 return (DST_R_INVALIDPUBLICKEY);
562 extflags = isc_buffer_getuint16(source);
563 flags |= (extflags << 16);
566 result = frombuffer(name, alg, flags, proto, rdclass, source,
568 if (result != ISC_R_SUCCESS)
573 return (ISC_R_SUCCESS);
577 dst_key_frombuffer(dns_name_t *name, unsigned int alg,
578 unsigned int flags, unsigned int protocol,
579 dns_rdataclass_t rdclass,
580 isc_buffer_t *source, isc_mem_t *mctx, dst_key_t **keyp)
582 dst_key_t *key = NULL;
585 REQUIRE(dst_initialized);
587 result = frombuffer(name, alg, flags, protocol, rdclass, source,
589 if (result != ISC_R_SUCCESS)
592 result = computeid(key);
593 if (result != ISC_R_SUCCESS) {
599 return (ISC_R_SUCCESS);
603 dst_key_tobuffer(const dst_key_t *key, isc_buffer_t *target) {
604 REQUIRE(dst_initialized == ISC_TRUE);
605 REQUIRE(VALID_KEY(key));
606 REQUIRE(target != NULL);
608 CHECKALG(key->key_alg);
610 if (key->func->todns == NULL)
611 return (DST_R_UNSUPPORTEDALG);
613 return (key->func->todns(key, target));
617 dst_key_privatefrombuffer(dst_key_t *key, isc_buffer_t *buffer) {
618 isc_lex_t *lex = NULL;
619 isc_result_t result = ISC_R_SUCCESS;
621 REQUIRE(dst_initialized == ISC_TRUE);
622 REQUIRE(VALID_KEY(key));
623 REQUIRE(!dst_key_isprivate(key));
624 REQUIRE(buffer != NULL);
626 if (key->func->parse == NULL)
627 RETERR(DST_R_UNSUPPORTEDALG);
629 RETERR(isc_lex_create(key->mctx, 1500, &lex));
630 RETERR(isc_lex_openbuffer(lex, buffer));
631 RETERR(key->func->parse(key, lex));
634 isc_lex_destroy(&lex);
639 dst_key_getgssctx(const dst_key_t *key)
641 REQUIRE(key != NULL);
643 return (key->keydata.gssctx);
647 dst_key_fromgssapi(dns_name_t *name, gss_ctx_id_t gssctx, isc_mem_t *mctx,
652 REQUIRE(gssctx != NULL);
653 REQUIRE(keyp != NULL && *keyp == NULL);
655 key = get_key_struct(name, DST_ALG_GSSAPI, 0, DNS_KEYPROTO_DNSSEC,
656 0, dns_rdataclass_in, mctx);
658 return (ISC_R_NOMEMORY);
660 key->keydata.gssctx = gssctx;
662 return (ISC_R_SUCCESS);
666 dst_key_generate(dns_name_t *name, unsigned int alg,
667 unsigned int bits, unsigned int param,
668 unsigned int flags, unsigned int protocol,
669 dns_rdataclass_t rdclass,
670 isc_mem_t *mctx, dst_key_t **keyp)
675 REQUIRE(dst_initialized == ISC_TRUE);
676 REQUIRE(dns_name_isabsolute(name));
677 REQUIRE(mctx != NULL);
678 REQUIRE(keyp != NULL && *keyp == NULL);
682 key = get_key_struct(name, alg, flags, protocol, bits, rdclass, mctx);
684 return (ISC_R_NOMEMORY);
686 if (bits == 0) { /*%< NULL KEY */
687 key->key_flags |= DNS_KEYTYPE_NOKEY;
689 return (ISC_R_SUCCESS);
692 if (key->func->generate == NULL) {
694 return (DST_R_UNSUPPORTEDALG);
697 ret = key->func->generate(key, param);
698 if (ret != ISC_R_SUCCESS) {
703 ret = computeid(key);
704 if (ret != ISC_R_SUCCESS) {
710 return (ISC_R_SUCCESS);
714 dst_key_compare(const dst_key_t *key1, const dst_key_t *key2) {
715 REQUIRE(dst_initialized == ISC_TRUE);
716 REQUIRE(VALID_KEY(key1));
717 REQUIRE(VALID_KEY(key2));
721 if (key1 == NULL || key2 == NULL)
723 if (key1->key_alg == key2->key_alg &&
724 key1->key_id == key2->key_id &&
725 key1->func->compare != NULL &&
726 key1->func->compare(key1, key2) == ISC_TRUE)
733 dst_key_paramcompare(const dst_key_t *key1, const dst_key_t *key2) {
734 REQUIRE(dst_initialized == ISC_TRUE);
735 REQUIRE(VALID_KEY(key1));
736 REQUIRE(VALID_KEY(key2));
740 if (key1 == NULL || key2 == NULL)
742 if (key1->key_alg == key2->key_alg &&
743 key1->func->paramcompare != NULL &&
744 key1->func->paramcompare(key1, key2) == ISC_TRUE)
751 dst_key_free(dst_key_t **keyp) {
755 REQUIRE(dst_initialized == ISC_TRUE);
756 REQUIRE(keyp != NULL && VALID_KEY(*keyp));
761 if (key->keydata.generic != NULL) {
762 INSIST(key->func->destroy != NULL);
763 key->func->destroy(key);
766 dns_name_free(key->key_name, mctx);
767 isc_mem_put(mctx, key->key_name, sizeof(dns_name_t));
768 memset(key, 0, sizeof(dst_key_t));
769 isc_mem_put(mctx, key, sizeof(dst_key_t));
774 dst_key_isprivate(const dst_key_t *key) {
775 REQUIRE(VALID_KEY(key));
776 INSIST(key->func->isprivate != NULL);
777 return (key->func->isprivate(key));
781 dst_key_buildfilename(const dst_key_t *key, int type,
782 const char *directory, isc_buffer_t *out) {
784 REQUIRE(VALID_KEY(key));
785 REQUIRE(type == DST_TYPE_PRIVATE || type == DST_TYPE_PUBLIC ||
788 return (buildfilename(key->key_name, key->key_id, key->key_alg,
789 type, directory, out));
793 dst_key_sigsize(const dst_key_t *key, unsigned int *n) {
794 REQUIRE(dst_initialized == ISC_TRUE);
795 REQUIRE(VALID_KEY(key));
798 /* XXXVIX this switch statement is too sparse to gen a jump table. */
799 switch (key->key_alg) {
801 case DST_ALG_RSASHA1:
802 *n = (key->key_size + 7) / 8;
805 *n = DNS_SIG_DSASIGSIZE;
807 case DST_ALG_HMACMD5:
810 case DST_ALG_HMACSHA1:
811 *n = ISC_SHA1_DIGESTLENGTH;
813 case DST_ALG_HMACSHA224:
814 *n = ISC_SHA224_DIGESTLENGTH;
816 case DST_ALG_HMACSHA256:
817 *n = ISC_SHA256_DIGESTLENGTH;
819 case DST_ALG_HMACSHA384:
820 *n = ISC_SHA384_DIGESTLENGTH;
822 case DST_ALG_HMACSHA512:
823 *n = ISC_SHA512_DIGESTLENGTH;
826 *n = 128; /*%< XXX */
830 return (DST_R_UNSUPPORTEDALG);
832 return (ISC_R_SUCCESS);
836 dst_key_secretsize(const dst_key_t *key, unsigned int *n) {
837 REQUIRE(dst_initialized == ISC_TRUE);
838 REQUIRE(VALID_KEY(key));
841 if (key->key_alg == DST_ALG_DH)
842 *n = (key->key_size + 7) / 8;
844 return (DST_R_UNSUPPORTEDALG);
845 return (ISC_R_SUCCESS);
853 * Allocates a key structure and fills in some of the fields.
856 get_key_struct(dns_name_t *name, unsigned int alg,
857 unsigned int flags, unsigned int protocol,
858 unsigned int bits, dns_rdataclass_t rdclass,
864 key = (dst_key_t *) isc_mem_get(mctx, sizeof(dst_key_t));
868 memset(key, 0, sizeof(dst_key_t));
869 key->magic = KEY_MAGIC;
871 key->key_name = isc_mem_get(mctx, sizeof(dns_name_t));
872 if (key->key_name == NULL) {
873 isc_mem_put(mctx, key, sizeof(dst_key_t));
876 dns_name_init(key->key_name, NULL);
877 result = dns_name_dup(name, mctx, key->key_name);
878 if (result != ISC_R_SUCCESS) {
879 isc_mem_put(mctx, key->key_name, sizeof(dns_name_t));
880 isc_mem_put(mctx, key, sizeof(dst_key_t));
884 key->key_flags = flags;
885 key->key_proto = protocol;
887 key->keydata.generic = NULL;
888 key->key_size = bits;
889 key->key_class = rdclass;
890 key->func = dst_t_func[alg];
895 * Reads a public key from disk
898 dst_key_read_public(const char *filename, int type,
899 isc_mem_t *mctx, dst_key_t **keyp)
901 u_char rdatabuf[DST_KEY_MAXSIZE];
903 dns_fixedname_t name;
904 isc_lex_t *lex = NULL;
907 dns_rdata_t rdata = DNS_RDATA_INIT;
908 unsigned int opt = ISC_LEXOPT_DNSMULTILINE;
909 dns_rdataclass_t rdclass = dns_rdataclass_in;
910 isc_lexspecials_t specials;
913 dns_rdatatype_t keytype;
916 * Open the file and read its formatted contents
918 * domain.name [ttl] [class] [KEY|DNSKEY] <flags> <protocol> <algorithm> <key>
921 /* 1500 should be large enough for any key */
922 ret = isc_lex_create(mctx, 1500, &lex);
923 if (ret != ISC_R_SUCCESS)
926 memset(specials, 0, sizeof(specials));
930 isc_lex_setspecials(lex, specials);
931 isc_lex_setcomments(lex, ISC_LEXCOMMENT_DNSMASTERFILE);
933 ret = isc_lex_openfile(lex, filename);
934 if (ret != ISC_R_SUCCESS)
937 #define NEXTTOKEN(lex, opt, token) { \
938 ret = isc_lex_gettoken(lex, opt, token); \
939 if (ret != ISC_R_SUCCESS) \
943 #define BADTOKEN() { \
944 ret = ISC_R_UNEXPECTEDTOKEN; \
948 /* Read the domain name */
949 NEXTTOKEN(lex, opt, &token);
950 if (token.type != isc_tokentype_string)
954 * We don't support "@" in .key files.
956 if (!strcmp(DST_AS_STR(token), "@"))
959 dns_fixedname_init(&name);
960 isc_buffer_init(&b, DST_AS_STR(token), strlen(DST_AS_STR(token)));
961 isc_buffer_add(&b, strlen(DST_AS_STR(token)));
962 ret = dns_name_fromtext(dns_fixedname_name(&name), &b, dns_rootname,
964 if (ret != ISC_R_SUCCESS)
967 /* Read the next word: either TTL, class, or 'KEY' */
968 NEXTTOKEN(lex, opt, &token);
970 if (token.type != isc_tokentype_string)
973 /* If it's a TTL, read the next one */
974 result = dns_ttl_fromtext(&token.value.as_textregion, &ttl);
975 if (result == ISC_R_SUCCESS)
976 NEXTTOKEN(lex, opt, &token);
978 if (token.type != isc_tokentype_string)
981 ret = dns_rdataclass_fromtext(&rdclass, &token.value.as_textregion);
982 if (ret == ISC_R_SUCCESS)
983 NEXTTOKEN(lex, opt, &token);
985 if (token.type != isc_tokentype_string)
988 if (strcasecmp(DST_AS_STR(token), "DNSKEY") == 0)
989 keytype = dns_rdatatype_dnskey;
990 else if (strcasecmp(DST_AS_STR(token), "KEY") == 0)
991 keytype = dns_rdatatype_key; /*%< SIG(0), TKEY */
995 if (((type & DST_TYPE_KEY) != 0 && keytype != dns_rdatatype_key) ||
996 ((type & DST_TYPE_KEY) == 0 && keytype != dns_rdatatype_dnskey)) {
997 ret = DST_R_BADKEYTYPE;
1001 isc_buffer_init(&b, rdatabuf, sizeof(rdatabuf));
1002 ret = dns_rdata_fromtext(&rdata, rdclass, keytype, lex, NULL,
1003 ISC_FALSE, mctx, &b, NULL);
1004 if (ret != ISC_R_SUCCESS)
1007 ret = dst_key_fromdns(dns_fixedname_name(&name), rdclass, &b, mctx,
1009 if (ret != ISC_R_SUCCESS)
1014 isc_lex_destroy(&lex);
1018 static isc_boolean_t
1019 issymmetric(const dst_key_t *key) {
1020 REQUIRE(dst_initialized == ISC_TRUE);
1021 REQUIRE(VALID_KEY(key));
1023 /* XXXVIX this switch statement is too sparse to gen a jump table. */
1024 switch (key->key_alg) {
1025 case DST_ALG_RSAMD5:
1026 case DST_ALG_RSASHA1:
1030 case DST_ALG_HMACMD5:
1031 case DST_ALG_GSSAPI:
1039 * Writes a public key to disk in DNS format.
1042 write_public_key(const dst_key_t *key, int type, const char *directory) {
1044 isc_buffer_t keyb, textb, fileb, classb;
1046 char filename[ISC_DIR_NAMEMAX];
1047 unsigned char key_array[DST_KEY_MAXSIZE];
1048 char text_array[DST_KEY_MAXTEXTSIZE];
1049 char class_array[10];
1051 dns_rdata_t rdata = DNS_RDATA_INIT;
1052 isc_fsaccess_t access;
1054 REQUIRE(VALID_KEY(key));
1056 isc_buffer_init(&keyb, key_array, sizeof(key_array));
1057 isc_buffer_init(&textb, text_array, sizeof(text_array));
1058 isc_buffer_init(&classb, class_array, sizeof(class_array));
1060 ret = dst_key_todns(key, &keyb);
1061 if (ret != ISC_R_SUCCESS)
1064 isc_buffer_usedregion(&keyb, &r);
1065 dns_rdata_fromregion(&rdata, key->key_class, dns_rdatatype_dnskey, &r);
1067 ret = dns_rdata_totext(&rdata, (dns_name_t *) NULL, &textb);
1068 if (ret != ISC_R_SUCCESS)
1069 return (DST_R_INVALIDPUBLICKEY);
1071 ret = dns_rdataclass_totext(key->key_class, &classb);
1072 if (ret != ISC_R_SUCCESS)
1073 return (DST_R_INVALIDPUBLICKEY);
1076 * Make the filename.
1078 isc_buffer_init(&fileb, filename, sizeof(filename));
1079 ret = dst_key_buildfilename(key, DST_TYPE_PUBLIC, directory, &fileb);
1080 if (ret != ISC_R_SUCCESS)
1084 * Create public key file.
1086 if ((fp = fopen(filename, "w")) == NULL)
1087 return (DST_R_WRITEERROR);
1089 if (issymmetric(key)) {
1091 isc_fsaccess_add(ISC_FSACCESS_OWNER,
1092 ISC_FSACCESS_READ | ISC_FSACCESS_WRITE,
1094 (void)isc_fsaccess_set(filename, access);
1097 ret = dns_name_print(key->key_name, fp);
1098 if (ret != ISC_R_SUCCESS) {
1105 isc_buffer_usedregion(&classb, &r);
1106 fwrite(r.base, 1, r.length, fp);
1108 if ((type & DST_TYPE_KEY) != 0)
1109 fprintf(fp, " KEY ");
1111 fprintf(fp, " DNSKEY ");
1113 isc_buffer_usedregion(&textb, &r);
1114 fwrite(r.base, 1, r.length, fp);
1119 ret = DST_R_WRITEERROR;
1126 buildfilename(dns_name_t *name, dns_keytag_t id,
1127 unsigned int alg, unsigned int type,
1128 const char *directory, isc_buffer_t *out)
1130 const char *suffix = "";
1132 isc_result_t result;
1134 REQUIRE(out != NULL);
1135 if ((type & DST_TYPE_PRIVATE) != 0)
1136 suffix = ".private";
1137 else if (type == DST_TYPE_PUBLIC)
1139 if (directory != NULL) {
1140 if (isc_buffer_availablelength(out) < strlen(directory))
1141 return (ISC_R_NOSPACE);
1142 isc_buffer_putstr(out, directory);
1143 if (strlen(directory) > 0U &&
1144 directory[strlen(directory) - 1] != '/')
1145 isc_buffer_putstr(out, "/");
1147 if (isc_buffer_availablelength(out) < 1)
1148 return (ISC_R_NOSPACE);
1149 isc_buffer_putstr(out, "K");
1150 result = dns_name_tofilenametext(name, ISC_FALSE, out);
1151 if (result != ISC_R_SUCCESS)
1153 len = 1 + 3 + 1 + 5 + strlen(suffix) + 1;
1154 if (isc_buffer_availablelength(out) < len)
1155 return (ISC_R_NOSPACE);
1156 sprintf((char *) isc_buffer_used(out), "+%03d+%05d%s", alg, id,
1158 isc_buffer_add(out, len);
1160 return (ISC_R_SUCCESS);
1164 computeid(dst_key_t *key) {
1165 isc_buffer_t dnsbuf;
1166 unsigned char dns_array[DST_KEY_MAXSIZE];
1170 isc_buffer_init(&dnsbuf, dns_array, sizeof(dns_array));
1171 ret = dst_key_todns(key, &dnsbuf);
1172 if (ret != ISC_R_SUCCESS)
1175 isc_buffer_usedregion(&dnsbuf, &r);
1176 key->key_id = dst_region_computeid(&r, key->key_alg);
1177 return (ISC_R_SUCCESS);
1181 frombuffer(dns_name_t *name, unsigned int alg, unsigned int flags,
1182 unsigned int protocol, dns_rdataclass_t rdclass,
1183 isc_buffer_t *source, isc_mem_t *mctx, dst_key_t **keyp)
1188 REQUIRE(dns_name_isabsolute(name));
1189 REQUIRE(source != NULL);
1190 REQUIRE(mctx != NULL);
1191 REQUIRE(keyp != NULL && *keyp == NULL);
1193 key = get_key_struct(name, alg, flags, protocol, 0, rdclass, mctx);
1195 return (ISC_R_NOMEMORY);
1197 if (isc_buffer_remaininglength(source) > 0) {
1198 ret = algorithm_status(alg);
1199 if (ret != ISC_R_SUCCESS) {
1203 if (key->func->fromdns == NULL) {
1205 return (DST_R_UNSUPPORTEDALG);
1208 ret = key->func->fromdns(key, source);
1209 if (ret != ISC_R_SUCCESS) {
1216 return (ISC_R_SUCCESS);
1220 algorithm_status(unsigned int alg) {
1221 REQUIRE(dst_initialized == ISC_TRUE);
1223 if (dst_algorithm_supported(alg))
1224 return (ISC_R_SUCCESS);
1226 if (alg == DST_ALG_RSAMD5 || alg == DST_ALG_RSASHA1 ||
1227 alg == DST_ALG_DSA || alg == DST_ALG_DH ||
1228 alg == DST_ALG_HMACMD5)
1229 return (DST_R_NOCRYPTO);
1231 return (DST_R_UNSUPPORTEDALG);
1235 addsuffix(char *filename, unsigned int len, const char *ofilename,
1238 int olen = strlen(ofilename);
1241 if (olen > 1 && ofilename[olen - 1] == '.')
1243 else if (olen > 8 && strcmp(ofilename + olen - 8, ".private") == 0)
1245 else if (olen > 4 && strcmp(ofilename + olen - 4, ".key") == 0)
1248 n = snprintf(filename, len, "%.*s%s", olen, ofilename, suffix);
1250 return (ISC_R_NOSPACE);
1251 return (ISC_R_SUCCESS);
1255 dst__entropy_getdata(void *buf, unsigned int len, isc_boolean_t pseudo) {
1256 unsigned int flags = dst_entropy_flags;
1258 flags &= ~ISC_ENTROPY_GOODONLY;
1259 return (isc_entropy_getdata(dst_entropy_pool, buf, len, NULL, flags));
1263 dst__entropy_status(void) {
1264 return (isc_entropy_status(dst_entropy_pool));