2 * Copyright (C) 2004-2013 Internet Systems Consortium, Inc. ("ISC")
3 * Copyright (C) 2000-2002 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.
23 /*! \file dst/dst.h */
26 #include <isc/stdtime.h>
28 #include <dns/types.h>
31 #include <dns/secalg.h>
33 #include <dst/gssapi.h>
42 * The dst_key structure is opaque. Applications should use the accessor
43 * functions provided to retrieve key attributes. If an application needs
44 * to set attributes, new accessor functions will be written.
47 typedef struct dst_key dst_key_t;
48 typedef struct dst_context dst_context_t;
50 /* DST algorithm codes */
51 #define DST_ALG_UNKNOWN 0
52 #define DST_ALG_RSAMD5 1
53 #define DST_ALG_RSA DST_ALG_RSAMD5 /*%< backwards compatibility */
57 #define DST_ALG_RSASHA1 5
58 #define DST_ALG_NSEC3DSA 6
59 #define DST_ALG_NSEC3RSASHA1 7
60 #define DST_ALG_RSASHA256 8
61 #define DST_ALG_RSASHA512 10
62 #define DST_ALG_ECCGOST 12
63 #define DST_ALG_ECDSA256 13
64 #define DST_ALG_ECDSA384 14
65 #define DST_ALG_HMACMD5 157
66 #define DST_ALG_GSSAPI 160
67 #define DST_ALG_HMACSHA1 161 /* XXXMPA */
68 #define DST_ALG_HMACSHA224 162 /* XXXMPA */
69 #define DST_ALG_HMACSHA256 163 /* XXXMPA */
70 #define DST_ALG_HMACSHA384 164 /* XXXMPA */
71 #define DST_ALG_HMACSHA512 165 /* XXXMPA */
72 #define DST_ALG_PRIVATE 254
73 #define DST_ALG_EXPAND 255
74 #define DST_MAX_ALGS 255
76 /*% A buffer of this size is large enough to hold any key */
77 #define DST_KEY_MAXSIZE 1280
80 * A buffer of this size is large enough to hold the textual representation
83 #define DST_KEY_MAXTEXTSIZE 2048
85 /*% 'Type' for dst_read_key() */
86 #define DST_TYPE_KEY 0x1000000 /* KEY key */
87 #define DST_TYPE_PRIVATE 0x2000000
88 #define DST_TYPE_PUBLIC 0x4000000
90 /* Key timing metadata definitions */
91 #define DST_TIME_CREATED 0
92 #define DST_TIME_PUBLISH 1
93 #define DST_TIME_ACTIVATE 2
94 #define DST_TIME_REVOKE 3
95 #define DST_TIME_INACTIVE 4
96 #define DST_TIME_DELETE 5
97 #define DST_TIME_DSPUBLISH 6
98 #define DST_MAX_TIMES 6
100 /* Numeric metadata definitions */
101 #define DST_NUM_PREDECESSOR 0
102 #define DST_NUM_SUCCESSOR 1
103 #define DST_NUM_MAXTTL 2
104 #define DST_NUM_ROLLPERIOD 3
105 #define DST_MAX_NUMERIC 3
108 * Current format version number of the private key parser.
110 * When parsing a key file with the same major number but a higher minor
111 * number, the key parser will ignore any fields it does not recognize.
112 * Thus, DST_MINOR_VERSION should be incremented whenever new
113 * fields are added to the private key file (such as new metadata).
115 * When rewriting these keys, those fields will be dropped, and the
116 * format version set back to the current one..
118 * When a key is seen with a higher major number, the key parser will
119 * reject it as invalid. Thus, DST_MAJOR_VERSION should be incremented
120 * and DST_MINOR_VERSION set to zero whenever there is a format change
121 * which is not backward compatible to previous versions of the dst_key
122 * parser, such as change in the syntax of an existing field, the removal
123 * of a currently mandatory field, or a new field added which would
124 * alter the functioning of the key if it were absent.
126 #define DST_MAJOR_VERSION 1
127 #define DST_MINOR_VERSION 3
134 dst_lib_init(isc_mem_t *mctx, isc_entropy_t *ectx, unsigned int eflags);
137 dst_lib_init2(isc_mem_t *mctx, isc_entropy_t *ectx,
138 const char *engine, unsigned int eflags);
140 * Initializes the DST subsystem.
143 * \li "mctx" is a valid memory context
144 * \li "ectx" is a valid entropy context
152 * \li DST is properly initialized.
156 dst_lib_destroy(void);
158 * Releases all resources allocated by DST.
162 dst_algorithm_supported(unsigned int alg);
164 * Checks that a given algorithm is supported by DST.
172 dst_context_create(dst_key_t *key, isc_mem_t *mctx, dst_context_t **dctxp);
175 dst_context_create2(dst_key_t *key, isc_mem_t *mctx,
176 isc_logcategory_t *category, dst_context_t **dctxp);
179 * Creates a context to be used for a sign or verify operation.
182 * \li "key" is a valid key.
183 * \li "mctx" is a valid memory context.
184 * \li dctxp != NULL && *dctxp == NULL
191 * \li *dctxp will contain a usable context.
195 dst_context_destroy(dst_context_t **dctxp);
197 * Destroys all memory associated with a context.
200 * \li *dctxp != NULL && *dctxp == NULL
207 dst_context_adddata(dst_context_t *dctx, const isc_region_t *data);
209 * Incrementally adds data to the context to be used in a sign or verify
213 * \li "dctx" is a valid context
214 * \li "data" is a valid region
218 * \li DST_R_SIGNFAILURE
219 * \li all other errors indicate failure
223 dst_context_sign(dst_context_t *dctx, isc_buffer_t *sig);
225 * Computes a signature using the data and key stored in the context.
228 * \li "dctx" is a valid context.
229 * \li "sig" is a valid buffer.
233 * \li DST_R_VERIFYFAILURE
234 * \li all other errors indicate failure
237 * \li "sig" will contain the signature
241 dst_context_verify(dst_context_t *dctx, isc_region_t *sig);
243 * Verifies the signature using the data and key stored in the context.
246 * \li "dctx" is a valid context.
247 * \li "sig" is a valid region.
251 * \li all other errors indicate failure
254 * \li "sig" will contain the signature
258 dst_key_computesecret(const dst_key_t *pub, const dst_key_t *priv,
259 isc_buffer_t *secret);
261 * Computes a shared secret from two (Diffie-Hellman) keys.
264 * \li "pub" is a valid key that can be used to derive a shared secret
265 * \li "priv" is a valid private key that can be used to derive a shared secret
266 * \li "secret" is a valid buffer
270 * \li any other result indicates failure
273 * \li If successful, secret will contain the derived shared secret.
277 dst_key_fromfile(dns_name_t *name, dns_keytag_t id, unsigned int alg, int type,
278 const char *directory, isc_mem_t *mctx, dst_key_t **keyp);
280 * Reads a key from permanent storage. The key can either be a public or
281 * private key, and is specified by name, algorithm, and id. If a private key
282 * is specified, the public key must also be present. If directory is NULL,
283 * the current directory is assumed.
286 * \li "name" is a valid absolute dns name.
287 * \li "id" is a valid key tag identifier.
288 * \li "alg" is a supported key algorithm.
289 * \li "type" is DST_TYPE_PUBLIC, DST_TYPE_PRIVATE, or the bitwise union.
290 * DST_TYPE_KEY look for a KEY record otherwise DNSKEY
291 * \li "mctx" is a valid memory context.
292 * \li "keyp" is not NULL and "*keyp" is NULL.
296 * \li any other result indicates failure
299 * \li If successful, *keyp will contain a valid key.
303 dst_key_fromnamedfile(const char *filename, const char *dirname,
304 int type, isc_mem_t *mctx, dst_key_t **keyp);
306 * Reads a key from permanent storage. The key can either be a public or
307 * key, and is specified by filename. If a private key is specified, the
308 * public key must also be present.
310 * If 'dirname' is not NULL, and 'filename' is a relative path,
311 * then the file is looked up relative to the given directory.
312 * If 'filename' is an absolute path, 'dirname' is ignored.
315 * \li "filename" is not NULL
316 * \li "type" is DST_TYPE_PUBLIC, DST_TYPE_PRIVATE, or the bitwise union
317 * DST_TYPE_KEY look for a KEY record otherwise DNSKEY
318 * \li "mctx" is a valid memory context
319 * \li "keyp" is not NULL and "*keyp" is NULL.
323 * \li any other result indicates failure
326 * \li If successful, *keyp will contain a valid key.
331 dst_key_read_public(const char *filename, int type,
332 isc_mem_t *mctx, dst_key_t **keyp);
334 * Reads a public key from permanent storage. The key must be a public key.
337 * \li "filename" is not NULL
338 * \li "type" is DST_TYPE_KEY look for a KEY record otherwise DNSKEY
339 * \li "mctx" is a valid memory context
340 * \li "keyp" is not NULL and "*keyp" is NULL.
344 * \li DST_R_BADKEYTYPE if the key type is not the expected one
345 * \li ISC_R_UNEXPECTEDTOKEN if the file can not be parsed as a public key
346 * \li any other result indicates failure
349 * \li If successful, *keyp will contain a valid key.
353 dst_key_tofile(const dst_key_t *key, int type, const char *directory);
355 * Writes a key to permanent storage. The key can either be a public or
356 * private key. Public keys are written in DNS format and private keys
357 * are written as a set of base64 encoded values. If directory is NULL,
358 * the current directory is assumed.
361 * \li "key" is a valid key.
362 * \li "type" is DST_TYPE_PUBLIC, DST_TYPE_PRIVATE, or the bitwise union
366 * \li any other result indicates failure
370 dst_key_fromdns(dns_name_t *name, dns_rdataclass_t rdclass,
371 isc_buffer_t *source, isc_mem_t *mctx, dst_key_t **keyp);
373 * Converts a DNS KEY record into a DST key.
376 * \li "name" is a valid absolute dns name.
377 * \li "source" is a valid buffer. There must be at least 4 bytes available.
378 * \li "mctx" is a valid memory context.
379 * \li "keyp" is not NULL and "*keyp" is NULL.
383 * \li any other result indicates failure
386 * \li If successful, *keyp will contain a valid key, and the consumed
387 * pointer in data will be advanced.
391 dst_key_todns(const dst_key_t *key, isc_buffer_t *target);
393 * Converts a DST key into a DNS KEY record.
396 * \li "key" is a valid key.
397 * \li "target" is a valid buffer. There must be at least 4 bytes unused.
401 * \li any other result indicates failure
404 * \li If successful, the used pointer in 'target' is advanced by at least 4.
408 dst_key_frombuffer(dns_name_t *name, unsigned int alg,
409 unsigned int flags, unsigned int protocol,
410 dns_rdataclass_t rdclass,
411 isc_buffer_t *source, isc_mem_t *mctx, dst_key_t **keyp);
413 * Converts a buffer containing DNS KEY RDATA into a DST key.
416 *\li "name" is a valid absolute dns name.
417 *\li "alg" is a supported key algorithm.
418 *\li "source" is a valid buffer.
419 *\li "mctx" is a valid memory context.
420 *\li "keyp" is not NULL and "*keyp" is NULL.
424 * \li any other result indicates failure
427 *\li If successful, *keyp will contain a valid key, and the consumed
428 * pointer in source will be advanced.
432 dst_key_tobuffer(const dst_key_t *key, isc_buffer_t *target);
434 * Converts a DST key into DNS KEY RDATA format.
437 *\li "key" is a valid key.
438 *\li "target" is a valid buffer.
442 * \li any other result indicates failure
445 *\li If successful, the used pointer in 'target' is advanced.
449 dst_key_privatefrombuffer(dst_key_t *key, isc_buffer_t *buffer);
451 * Converts a public key into a private key, reading the private key
452 * information from the buffer. The buffer should contain the same data
453 * as the .private key file would.
456 *\li "key" is a valid public key.
457 *\li "buffer" is not NULL.
461 * \li any other result indicates failure
464 *\li If successful, key will contain a valid private key.
468 dst_key_getgssctx(const dst_key_t *key);
470 * Returns the opaque key data.
471 * Be cautions when using this value unless you know what you are doing.
474 *\li "key" is not NULL.
477 *\li gssctx key data, possibly NULL.
481 dst_key_fromgssapi(dns_name_t *name, gss_ctx_id_t gssctx, isc_mem_t *mctx,
482 dst_key_t **keyp, isc_region_t *intoken);
484 * Converts a GSSAPI opaque context id into a DST key.
487 *\li "name" is a valid absolute dns name.
488 *\li "gssctx" is a GSSAPI context id.
489 *\li "mctx" is a valid memory context.
490 *\li "keyp" is not NULL and "*keyp" is NULL.
494 * \li any other result indicates failure
497 *\li If successful, *keyp will contain a valid key and be responsible for
502 dst_key_fromlabel(dns_name_t *name, int alg, unsigned int flags,
503 unsigned int protocol, dns_rdataclass_t rdclass,
504 const char *engine, const char *label, const char *pin,
505 isc_mem_t *mctx, dst_key_t **keyp);
508 dst_key_generate(dns_name_t *name, unsigned int alg,
509 unsigned int bits, unsigned int param,
510 unsigned int flags, unsigned int protocol,
511 dns_rdataclass_t rdclass,
512 isc_mem_t *mctx, dst_key_t **keyp);
515 dst_key_generate2(dns_name_t *name, unsigned int alg,
516 unsigned int bits, unsigned int param,
517 unsigned int flags, unsigned int protocol,
518 dns_rdataclass_t rdclass,
519 isc_mem_t *mctx, dst_key_t **keyp,
520 void (*callback)(int));
522 * Generate a DST key (or keypair) with the supplied parameters. The
523 * interpretation of the "param" field depends on the algorithm:
527 * !0 use Fermat4 (2^16 + 1)
529 * 0 default - use well known prime if bits == 768 or 1024,
530 * otherwise use 2 as the generator.
531 * !0 use this value as the generator.
534 * 0 default - require good entropy
535 * !0 lack of good entropy is ok
539 *\li "name" is a valid absolute dns name.
540 *\li "keyp" is not NULL and "*keyp" is NULL.
544 * \li any other result indicates failure
547 *\li If successful, *keyp will contain a valid key.
551 dst_key_compare(const dst_key_t *key1, const dst_key_t *key2);
553 * Compares two DST keys. Returns true if they match, false otherwise.
555 * Keys ARE NOT considered to match if one of them is the revoked version
559 *\li "key1" is a valid key.
560 *\li "key2" is a valid key.
568 dst_key_pubcompare(const dst_key_t *key1, const dst_key_t *key2,
569 isc_boolean_t match_revoked_key);
571 * Compares only the public portions of two DST keys. Returns true
572 * if they match, false otherwise. This allows us, for example, to
573 * determine whether a public key found in a zone matches up with a
574 * key pair found on disk.
576 * If match_revoked_key is TRUE, then keys ARE considered to match if one
577 * of them is the revoked version of the other. Otherwise, they are not.
580 *\li "key1" is a valid key.
581 *\li "key2" is a valid key.
589 dst_key_paramcompare(const dst_key_t *key1, const dst_key_t *key2);
591 * Compares the parameters of two DST keys. This is used to determine if
592 * two (Diffie-Hellman) keys can be used to derive a shared secret.
595 *\li "key1" is a valid key.
596 *\li "key2" is a valid key.
604 dst_key_attach(dst_key_t *source, dst_key_t **target);
606 * Attach to a existing key increasing the reference count.
609 *\li 'source' to be a valid key.
610 *\li 'target' to be non-NULL and '*target' to be NULL.
614 dst_key_free(dst_key_t **keyp);
616 * Decrement the key's reference counter and, when it reaches zero,
617 * release all memory associated with the key.
620 *\li "keyp" is not NULL and "*keyp" is a valid key.
621 *\li reference counter greater than zero.
624 *\li All memory associated with "*keyp" will be freed.
629 * Accessor functions to obtain key fields.
632 *\li "key" is a valid key.
635 dst_key_name(const dst_key_t *key);
638 dst_key_size(const dst_key_t *key);
641 dst_key_proto(const dst_key_t *key);
644 dst_key_alg(const dst_key_t *key);
647 dst_key_flags(const dst_key_t *key);
650 dst_key_id(const dst_key_t *key);
653 dst_key_rid(const dst_key_t *key);
656 dst_key_class(const dst_key_t *key);
659 dst_key_isprivate(const dst_key_t *key);
662 dst_key_iszonekey(const dst_key_t *key);
665 dst_key_isnullkey(const dst_key_t *key);
668 dst_key_buildfilename(const dst_key_t *key, int type,
669 const char *directory, isc_buffer_t *out);
671 * Generates the filename used by dst to store the specified key.
672 * If directory is NULL, the current directory is assumed.
675 *\li "key" is a valid key
676 *\li "type" is either DST_TYPE_PUBLIC, DST_TYPE_PRIVATE, or 0 for no suffix.
677 *\li "out" is a valid buffer
680 *\li the file name will be written to "out", and the used pointer will
685 dst_key_sigsize(const dst_key_t *key, unsigned int *n);
687 * Computes the size of a signature generated by the given key.
690 *\li "key" is a valid key.
695 *\li DST_R_UNSUPPORTEDALG
698 *\li "n" stores the size of a generated signature
702 dst_key_secretsize(const dst_key_t *key, unsigned int *n);
704 * Computes the size of a shared secret generated by the given key.
707 *\li "key" is a valid key.
712 *\li DST_R_UNSUPPORTEDALG
715 *\li "n" stores the size of a generated shared secret
719 dst_region_computeid(const isc_region_t *source, unsigned int alg);
721 dst_region_computerid(const isc_region_t *source, unsigned int alg);
723 * Computes the (revoked) key id of the key stored in the provided
724 * region with the given algorithm.
727 *\li "source" contains a valid, non-NULL region.
734 dst_key_getbits(const dst_key_t *key);
736 * Get the number of digest bits required (0 == MAX).
739 * "key" is a valid key.
743 dst_key_setbits(dst_key_t *key, isc_uint16_t bits);
745 * Set the number of digest bits required (0 == MAX).
748 * "key" is a valid key.
752 dst_key_setflags(dst_key_t *key, isc_uint32_t flags);
754 * Set the key flags, and recompute the key ID.
757 * "key" is a valid key.
761 dst_key_getnum(const dst_key_t *key, int type, isc_uint32_t *valuep);
763 * Get a member of the numeric metadata array and place it in '*valuep'.
766 * "key" is a valid key.
767 * "type" is no larger than DST_MAX_NUMERIC
768 * "timep" is not null.
772 dst_key_setnum(dst_key_t *key, int type, isc_uint32_t value);
774 * Set a member of the numeric metadata array.
777 * "key" is a valid key.
778 * "type" is no larger than DST_MAX_NUMERIC
782 dst_key_unsetnum(dst_key_t *key, int type);
784 * Flag a member of the numeric metadata array as "not set".
787 * "key" is a valid key.
788 * "type" is no larger than DST_MAX_NUMERIC
792 dst_key_gettime(const dst_key_t *key, int type, isc_stdtime_t *timep);
794 * Get a member of the timing metadata array and place it in '*timep'.
797 * "key" is a valid key.
798 * "type" is no larger than DST_MAX_TIMES
799 * "timep" is not null.
803 dst_key_settime(dst_key_t *key, int type, isc_stdtime_t when);
805 * Set a member of the timing metadata array.
808 * "key" is a valid key.
809 * "type" is no larger than DST_MAX_TIMES
813 dst_key_unsettime(dst_key_t *key, int type);
815 * Flag a member of the timing metadata array as "not set".
818 * "key" is a valid key.
819 * "type" is no larger than DST_MAX_TIMES
823 dst_key_getprivateformat(const dst_key_t *key, int *majorp, int *minorp);
825 * Get the private key format version number. (If the key does not have
826 * a private key associated with it, the version will be 0.0.) The major
827 * version number is placed in '*majorp', and the minor version number in
831 * "key" is a valid key.
832 * "majorp" is not NULL.
833 * "minorp" is not NULL.
837 dst_key_setprivateformat(dst_key_t *key, int major, int minor);
839 * Set the private key format version number.
842 * "key" is a valid key.
845 #define DST_KEY_FORMATSIZE (DNS_NAME_FORMATSIZE + DNS_SECALG_FORMATSIZE + 7)
848 dst_key_format(const dst_key_t *key, char *cp, unsigned int size);
850 * Write the uniquely identifying information about the key (name,
851 * algorithm, key ID) into a string 'cp' of size 'size'.
856 dst_key_tkeytoken(const dst_key_t *key);
858 * Return the token from the TKEY request, if any. If this key was
859 * not negotiated via TKEY, return NULL.
862 * "key" is a valid key.
867 dst_key_dump(dst_key_t *key, isc_mem_t *mctx, char **buffer, int *length);
869 * Allocate 'buffer' and dump the key into it in base64 format. The buffer
870 * is not NUL terminated. The length of the buffer is returned in *length.
872 * 'buffer' needs to be freed using isc_mem_put(mctx, buffer, length);
875 * 'buffer' to be non NULL and *buffer to be NULL.
876 * 'length' to be non NULL and *length to be zero.
881 * ISC_R_NOTIMPLEMENTED
886 dst_key_restore(dns_name_t *name, unsigned int alg, unsigned int flags,
887 unsigned int protocol, dns_rdataclass_t rdclass,
888 isc_mem_t *mctx, const char *keystr, dst_key_t **keyp);
891 dst_key_inactive(const dst_key_t *key);
893 * Determines if the private key is missing due the key being deemed inactive.
900 dst_key_setinactive(dst_key_t *key, isc_boolean_t inactive);
902 * Set key inactive state.
910 #endif /* DST_DST_H */