2 * Copyright (C) 2004-2012 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>
30 #include <dns/secalg.h>
32 #include <dst/gssapi.h>
41 * The dst_key structure is opaque. Applications should use the accessor
42 * functions provided to retrieve key attributes. If an application needs
43 * to set attributes, new accessor functions will be written.
46 typedef struct dst_key dst_key_t;
47 typedef struct dst_context dst_context_t;
49 /* DST algorithm codes */
50 #define DST_ALG_UNKNOWN 0
51 #define DST_ALG_RSAMD5 1
52 #define DST_ALG_RSA DST_ALG_RSAMD5 /*%< backwards compatibility */
56 #define DST_ALG_RSASHA1 5
57 #define DST_ALG_NSEC3DSA 6
58 #define DST_ALG_NSEC3RSASHA1 7
59 #define DST_ALG_RSASHA256 8
60 #define DST_ALG_RSASHA512 10
61 #define DST_ALG_ECCGOST 12
62 #define DST_ALG_ECDSA256 13
63 #define DST_ALG_ECDSA384 14
64 #define DST_ALG_HMACMD5 157
65 #define DST_ALG_GSSAPI 160
66 #define DST_ALG_HMACSHA1 161 /* XXXMPA */
67 #define DST_ALG_HMACSHA224 162 /* XXXMPA */
68 #define DST_ALG_HMACSHA256 163 /* XXXMPA */
69 #define DST_ALG_HMACSHA384 164 /* XXXMPA */
70 #define DST_ALG_HMACSHA512 165 /* XXXMPA */
71 #define DST_ALG_PRIVATE 254
72 #define DST_ALG_EXPAND 255
73 #define DST_MAX_ALGS 255
75 /*% A buffer of this size is large enough to hold any key */
76 #define DST_KEY_MAXSIZE 1280
79 * A buffer of this size is large enough to hold the textual representation
82 #define DST_KEY_MAXTEXTSIZE 2048
84 /*% 'Type' for dst_read_key() */
85 #define DST_TYPE_KEY 0x1000000 /* KEY key */
86 #define DST_TYPE_PRIVATE 0x2000000
87 #define DST_TYPE_PUBLIC 0x4000000
89 /* Key timing metadata definitions */
90 #define DST_TIME_CREATED 0
91 #define DST_TIME_PUBLISH 1
92 #define DST_TIME_ACTIVATE 2
93 #define DST_TIME_REVOKE 3
94 #define DST_TIME_INACTIVE 4
95 #define DST_TIME_DELETE 5
96 #define DST_TIME_DSPUBLISH 6
97 #define DST_MAX_TIMES 6
99 /* Numeric metadata definitions */
100 #define DST_NUM_PREDECESSOR 0
101 #define DST_NUM_SUCCESSOR 1
102 #define DST_NUM_MAXTTL 2
103 #define DST_NUM_ROLLPERIOD 3
104 #define DST_MAX_NUMERIC 3
107 * Current format version number of the private key parser.
109 * When parsing a key file with the same major number but a higher minor
110 * number, the key parser will ignore any fields it does not recognize.
111 * Thus, DST_MINOR_VERSION should be incremented whenever new
112 * fields are added to the private key file (such as new metadata).
114 * When rewriting these keys, those fields will be dropped, and the
115 * format version set back to the current one..
117 * When a key is seen with a higher major number, the key parser will
118 * reject it as invalid. Thus, DST_MAJOR_VERSION should be incremented
119 * and DST_MINOR_VERSION set to zero whenever there is a format change
120 * which is not backward compatible to previous versions of the dst_key
121 * parser, such as change in the syntax of an existing field, the removal
122 * of a currently mandatory field, or a new field added which would
123 * alter the functioning of the key if it were absent.
125 #define DST_MAJOR_VERSION 1
126 #define DST_MINOR_VERSION 3
133 dst_lib_init(isc_mem_t *mctx, isc_entropy_t *ectx, unsigned int eflags);
136 dst_lib_init2(isc_mem_t *mctx, isc_entropy_t *ectx,
137 const char *engine, unsigned int eflags);
139 * Initializes the DST subsystem.
142 * \li "mctx" is a valid memory context
143 * \li "ectx" is a valid entropy context
151 * \li DST is properly initialized.
155 dst_lib_destroy(void);
157 * Releases all resources allocated by DST.
161 dst_algorithm_supported(unsigned int alg);
163 * Checks that a given algorithm is supported by DST.
171 dst_context_create(dst_key_t *key, isc_mem_t *mctx, dst_context_t **dctxp);
173 * Creates a context to be used for a sign or verify operation.
176 * \li "key" is a valid key.
177 * \li "mctx" is a valid memory context.
178 * \li dctxp != NULL && *dctxp == NULL
185 * \li *dctxp will contain a usable context.
189 dst_context_destroy(dst_context_t **dctxp);
191 * Destroys all memory associated with a context.
194 * \li *dctxp != NULL && *dctxp == NULL
201 dst_context_adddata(dst_context_t *dctx, const isc_region_t *data);
203 * Incrementally adds data to the context to be used in a sign or verify
207 * \li "dctx" is a valid context
208 * \li "data" is a valid region
212 * \li DST_R_SIGNFAILURE
213 * \li all other errors indicate failure
217 dst_context_sign(dst_context_t *dctx, isc_buffer_t *sig);
219 * Computes a signature using the data and key stored in the context.
222 * \li "dctx" is a valid context.
223 * \li "sig" is a valid buffer.
227 * \li DST_R_VERIFYFAILURE
228 * \li all other errors indicate failure
231 * \li "sig" will contain the signature
235 dst_context_verify(dst_context_t *dctx, isc_region_t *sig);
237 * Verifies the signature using the data and key stored in the context.
240 * \li "dctx" is a valid context.
241 * \li "sig" is a valid region.
245 * \li all other errors indicate failure
248 * \li "sig" will contain the signature
252 dst_key_computesecret(const dst_key_t *pub, const dst_key_t *priv,
253 isc_buffer_t *secret);
255 * Computes a shared secret from two (Diffie-Hellman) keys.
258 * \li "pub" is a valid key that can be used to derive a shared secret
259 * \li "priv" is a valid private key that can be used to derive a shared secret
260 * \li "secret" is a valid buffer
264 * \li any other result indicates failure
267 * \li If successful, secret will contain the derived shared secret.
271 dst_key_fromfile(dns_name_t *name, dns_keytag_t id, unsigned int alg, int type,
272 const char *directory, isc_mem_t *mctx, dst_key_t **keyp);
274 * Reads a key from permanent storage. The key can either be a public or
275 * private key, and is specified by name, algorithm, and id. If a private key
276 * is specified, the public key must also be present. If directory is NULL,
277 * the current directory is assumed.
280 * \li "name" is a valid absolute dns name.
281 * \li "id" is a valid key tag identifier.
282 * \li "alg" is a supported key algorithm.
283 * \li "type" is DST_TYPE_PUBLIC, DST_TYPE_PRIVATE, or the bitwise union.
284 * DST_TYPE_KEY look for a KEY record otherwise DNSKEY
285 * \li "mctx" is a valid memory context.
286 * \li "keyp" is not NULL and "*keyp" is NULL.
290 * \li any other result indicates failure
293 * \li If successful, *keyp will contain a valid key.
297 dst_key_fromnamedfile(const char *filename, const char *dirname,
298 int type, isc_mem_t *mctx, dst_key_t **keyp);
300 * Reads a key from permanent storage. The key can either be a public or
301 * key, and is specified by filename. If a private key is specified, the
302 * public key must also be present.
304 * If 'dirname' is not NULL, and 'filename' is a relative path,
305 * then the file is looked up relative to the given directory.
306 * If 'filename' is an absolute path, 'dirname' is ignored.
309 * \li "filename" is not NULL
310 * \li "type" is DST_TYPE_PUBLIC, DST_TYPE_PRIVATE, or the bitwise union
311 * DST_TYPE_KEY look for a KEY record otherwise DNSKEY
312 * \li "mctx" is a valid memory context
313 * \li "keyp" is not NULL and "*keyp" is NULL.
317 * \li any other result indicates failure
320 * \li If successful, *keyp will contain a valid key.
325 dst_key_read_public(const char *filename, int type,
326 isc_mem_t *mctx, dst_key_t **keyp);
328 * Reads a public key from permanent storage. The key must be a public key.
331 * \li "filename" is not NULL
332 * \li "type" is DST_TYPE_KEY look for a KEY record otherwise DNSKEY
333 * \li "mctx" is a valid memory context
334 * \li "keyp" is not NULL and "*keyp" is NULL.
338 * \li DST_R_BADKEYTYPE if the key type is not the expected one
339 * \li ISC_R_UNEXPECTEDTOKEN if the file can not be parsed as a public key
340 * \li any other result indicates failure
343 * \li If successful, *keyp will contain a valid key.
347 dst_key_tofile(const dst_key_t *key, int type, const char *directory);
349 * Writes a key to permanent storage. The key can either be a public or
350 * private key. Public keys are written in DNS format and private keys
351 * are written as a set of base64 encoded values. If directory is NULL,
352 * the current directory is assumed.
355 * \li "key" is a valid key.
356 * \li "type" is DST_TYPE_PUBLIC, DST_TYPE_PRIVATE, or the bitwise union
360 * \li any other result indicates failure
364 dst_key_fromdns(dns_name_t *name, dns_rdataclass_t rdclass,
365 isc_buffer_t *source, isc_mem_t *mctx, dst_key_t **keyp);
367 * Converts a DNS KEY record into a DST key.
370 * \li "name" is a valid absolute dns name.
371 * \li "source" is a valid buffer. There must be at least 4 bytes available.
372 * \li "mctx" is a valid memory context.
373 * \li "keyp" is not NULL and "*keyp" is NULL.
377 * \li any other result indicates failure
380 * \li If successful, *keyp will contain a valid key, and the consumed
381 * pointer in data will be advanced.
385 dst_key_todns(const dst_key_t *key, isc_buffer_t *target);
387 * Converts a DST key into a DNS KEY record.
390 * \li "key" is a valid key.
391 * \li "target" is a valid buffer. There must be at least 4 bytes unused.
395 * \li any other result indicates failure
398 * \li If successful, the used pointer in 'target' is advanced by at least 4.
402 dst_key_frombuffer(dns_name_t *name, unsigned int alg,
403 unsigned int flags, unsigned int protocol,
404 dns_rdataclass_t rdclass,
405 isc_buffer_t *source, isc_mem_t *mctx, dst_key_t **keyp);
407 * Converts a buffer containing DNS KEY RDATA into a DST key.
410 *\li "name" is a valid absolute dns name.
411 *\li "alg" is a supported key algorithm.
412 *\li "source" is a valid buffer.
413 *\li "mctx" is a valid memory context.
414 *\li "keyp" is not NULL and "*keyp" is NULL.
418 * \li any other result indicates failure
421 *\li If successful, *keyp will contain a valid key, and the consumed
422 * pointer in source will be advanced.
426 dst_key_tobuffer(const dst_key_t *key, isc_buffer_t *target);
428 * Converts a DST key into DNS KEY RDATA format.
431 *\li "key" is a valid key.
432 *\li "target" is a valid buffer.
436 * \li any other result indicates failure
439 *\li If successful, the used pointer in 'target' is advanced.
443 dst_key_privatefrombuffer(dst_key_t *key, isc_buffer_t *buffer);
445 * Converts a public key into a private key, reading the private key
446 * information from the buffer. The buffer should contain the same data
447 * as the .private key file would.
450 *\li "key" is a valid public key.
451 *\li "buffer" is not NULL.
455 * \li any other result indicates failure
458 *\li If successful, key will contain a valid private key.
462 dst_key_getgssctx(const dst_key_t *key);
464 * Returns the opaque key data.
465 * Be cautions when using this value unless you know what you are doing.
468 *\li "key" is not NULL.
471 *\li gssctx key data, possibly NULL.
475 dst_key_fromgssapi(dns_name_t *name, gss_ctx_id_t gssctx, isc_mem_t *mctx,
476 dst_key_t **keyp, isc_region_t *intoken);
478 * Converts a GSSAPI opaque context id into a DST key.
481 *\li "name" is a valid absolute dns name.
482 *\li "gssctx" is a GSSAPI context id.
483 *\li "mctx" is a valid memory context.
484 *\li "keyp" is not NULL and "*keyp" is NULL.
488 * \li any other result indicates failure
491 *\li If successful, *keyp will contain a valid key and be responsible for
496 dst_key_fromlabel(dns_name_t *name, int alg, unsigned int flags,
497 unsigned int protocol, dns_rdataclass_t rdclass,
498 const char *engine, const char *label, const char *pin,
499 isc_mem_t *mctx, dst_key_t **keyp);
502 dst_key_generate(dns_name_t *name, unsigned int alg,
503 unsigned int bits, unsigned int param,
504 unsigned int flags, unsigned int protocol,
505 dns_rdataclass_t rdclass,
506 isc_mem_t *mctx, dst_key_t **keyp);
509 dst_key_generate2(dns_name_t *name, unsigned int alg,
510 unsigned int bits, unsigned int param,
511 unsigned int flags, unsigned int protocol,
512 dns_rdataclass_t rdclass,
513 isc_mem_t *mctx, dst_key_t **keyp,
514 void (*callback)(int));
516 * Generate a DST key (or keypair) with the supplied parameters. The
517 * interpretation of the "param" field depends on the algorithm:
521 * !0 use Fermat4 (2^16 + 1)
523 * 0 default - use well known prime if bits == 768 or 1024,
524 * otherwise use 2 as the generator.
525 * !0 use this value as the generator.
528 * 0 default - require good entropy
529 * !0 lack of good entropy is ok
533 *\li "name" is a valid absolute dns name.
534 *\li "keyp" is not NULL and "*keyp" is NULL.
538 * \li any other result indicates failure
541 *\li If successful, *keyp will contain a valid key.
545 dst_key_compare(const dst_key_t *key1, const dst_key_t *key2);
547 * Compares two DST keys. Returns true if they match, false otherwise.
549 * Keys ARE NOT considered to match if one of them is the revoked version
553 *\li "key1" is a valid key.
554 *\li "key2" is a valid key.
562 dst_key_pubcompare(const dst_key_t *key1, const dst_key_t *key2,
563 isc_boolean_t match_revoked_key);
565 * Compares only the public portions of two DST keys. Returns true
566 * if they match, false otherwise. This allows us, for example, to
567 * determine whether a public key found in a zone matches up with a
568 * key pair found on disk.
570 * If match_revoked_key is TRUE, then keys ARE considered to match if one
571 * of them is the revoked version of the other. Otherwise, they are not.
574 *\li "key1" is a valid key.
575 *\li "key2" is a valid key.
583 dst_key_paramcompare(const dst_key_t *key1, const dst_key_t *key2);
585 * Compares the parameters of two DST keys. This is used to determine if
586 * two (Diffie-Hellman) keys can be used to derive a shared secret.
589 *\li "key1" is a valid key.
590 *\li "key2" is a valid key.
598 dst_key_attach(dst_key_t *source, dst_key_t **target);
600 * Attach to a existing key increasing the reference count.
603 *\li 'source' to be a valid key.
604 *\li 'target' to be non-NULL and '*target' to be NULL.
608 dst_key_free(dst_key_t **keyp);
610 * Decrement the key's reference counter and, when it reaches zero,
611 * release all memory associated with the key.
614 *\li "keyp" is not NULL and "*keyp" is a valid key.
615 *\li reference counter greater than zero.
618 *\li All memory associated with "*keyp" will be freed.
623 * Accessor functions to obtain key fields.
626 *\li "key" is a valid key.
629 dst_key_name(const dst_key_t *key);
632 dst_key_size(const dst_key_t *key);
635 dst_key_proto(const dst_key_t *key);
638 dst_key_alg(const dst_key_t *key);
641 dst_key_flags(const dst_key_t *key);
644 dst_key_id(const dst_key_t *key);
647 dst_key_rid(const dst_key_t *key);
650 dst_key_class(const dst_key_t *key);
653 dst_key_isprivate(const dst_key_t *key);
656 dst_key_iszonekey(const dst_key_t *key);
659 dst_key_isnullkey(const dst_key_t *key);
662 dst_key_buildfilename(const dst_key_t *key, int type,
663 const char *directory, isc_buffer_t *out);
665 * Generates the filename used by dst to store the specified key.
666 * If directory is NULL, the current directory is assumed.
669 *\li "key" is a valid key
670 *\li "type" is either DST_TYPE_PUBLIC, DST_TYPE_PRIVATE, or 0 for no suffix.
671 *\li "out" is a valid buffer
674 *\li the file name will be written to "out", and the used pointer will
679 dst_key_sigsize(const dst_key_t *key, unsigned int *n);
681 * Computes the size of a signature generated by the given key.
684 *\li "key" is a valid key.
689 *\li DST_R_UNSUPPORTEDALG
692 *\li "n" stores the size of a generated signature
696 dst_key_secretsize(const dst_key_t *key, unsigned int *n);
698 * Computes the size of a shared secret generated by the given key.
701 *\li "key" is a valid key.
706 *\li DST_R_UNSUPPORTEDALG
709 *\li "n" stores the size of a generated shared secret
713 dst_region_computeid(const isc_region_t *source, unsigned int alg);
715 dst_region_computerid(const isc_region_t *source, unsigned int alg);
717 * Computes the (revoked) key id of the key stored in the provided
718 * region with the given algorithm.
721 *\li "source" contains a valid, non-NULL region.
728 dst_key_getbits(const dst_key_t *key);
730 * Get the number of digest bits required (0 == MAX).
733 * "key" is a valid key.
737 dst_key_setbits(dst_key_t *key, isc_uint16_t bits);
739 * Set the number of digest bits required (0 == MAX).
742 * "key" is a valid key.
746 dst_key_setflags(dst_key_t *key, isc_uint32_t flags);
748 * Set the key flags, and recompute the key ID.
751 * "key" is a valid key.
755 dst_key_getnum(const dst_key_t *key, int type, isc_uint32_t *valuep);
757 * Get a member of the numeric metadata array and place it in '*valuep'.
760 * "key" is a valid key.
761 * "type" is no larger than DST_MAX_NUMERIC
762 * "timep" is not null.
766 dst_key_setnum(dst_key_t *key, int type, isc_uint32_t value);
768 * Set a member of the numeric metadata array.
771 * "key" is a valid key.
772 * "type" is no larger than DST_MAX_NUMERIC
776 dst_key_unsetnum(dst_key_t *key, int type);
778 * Flag a member of the numeric metadata array as "not set".
781 * "key" is a valid key.
782 * "type" is no larger than DST_MAX_NUMERIC
786 dst_key_gettime(const dst_key_t *key, int type, isc_stdtime_t *timep);
788 * Get a member of the timing metadata array and place it in '*timep'.
791 * "key" is a valid key.
792 * "type" is no larger than DST_MAX_TIMES
793 * "timep" is not null.
797 dst_key_settime(dst_key_t *key, int type, isc_stdtime_t when);
799 * Set a member of the timing metadata array.
802 * "key" is a valid key.
803 * "type" is no larger than DST_MAX_TIMES
807 dst_key_unsettime(dst_key_t *key, int type);
809 * Flag a member of the timing metadata array as "not set".
812 * "key" is a valid key.
813 * "type" is no larger than DST_MAX_TIMES
817 dst_key_getprivateformat(const dst_key_t *key, int *majorp, int *minorp);
819 * Get the private key format version number. (If the key does not have
820 * a private key associated with it, the version will be 0.0.) The major
821 * version number is placed in '*majorp', and the minor version number in
825 * "key" is a valid key.
826 * "majorp" is not NULL.
827 * "minorp" is not NULL.
831 dst_key_setprivateformat(dst_key_t *key, int major, int minor);
833 * Set the private key format version number.
836 * "key" is a valid key.
839 #define DST_KEY_FORMATSIZE (DNS_NAME_FORMATSIZE + DNS_SECALG_FORMATSIZE + 7)
842 dst_key_format(const dst_key_t *key, char *cp, unsigned int size);
844 * Write the uniquely identifying information about the key (name,
845 * algorithm, key ID) into a string 'cp' of size 'size'.
850 dst_key_tkeytoken(const dst_key_t *key);
852 * Return the token from the TKEY request, if any. If this key was
853 * not negotiated via TKEY, return NULL.
856 * "key" is a valid key.
861 dst_key_dump(dst_key_t *key, isc_mem_t *mctx, char **buffer, int *length);
863 * Allocate 'buffer' and dump the key into it in base64 format. The buffer
864 * is not NUL terminated. The length of the buffer is returned in *length.
866 * 'buffer' needs to be freed using isc_mem_put(mctx, buffer, length);
869 * 'buffer' to be non NULL and *buffer to be NULL.
870 * 'length' to be non NULL and *length to be zero.
875 * ISC_R_NOTIMPLEMENTED
880 dst_key_restore(dns_name_t *name, unsigned int alg, unsigned int flags,
881 unsigned int protocol, dns_rdataclass_t rdclass,
882 isc_mem_t *mctx, const char *keystr, dst_key_t **keyp);
887 #endif /* DST_DST_H */