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
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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
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18 /* $Id: dst.h,v 1.34 2011/10/20 21:20:02 marka Exp $ */
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);
244 dst_context_verify2(dst_context_t *dctx, unsigned int maxbits,
247 * Verifies the signature using the data and key stored in the context.
249 * 'maxbits' specifies the maximum number of bits permitted in the RSA
253 * \li "dctx" is a valid context.
254 * \li "sig" is a valid region.
258 * \li all other errors indicate failure
261 * \li "sig" will contain the signature
265 dst_key_computesecret(const dst_key_t *pub, const dst_key_t *priv,
266 isc_buffer_t *secret);
268 * Computes a shared secret from two (Diffie-Hellman) keys.
271 * \li "pub" is a valid key that can be used to derive a shared secret
272 * \li "priv" is a valid private key that can be used to derive a shared secret
273 * \li "secret" is a valid buffer
277 * \li any other result indicates failure
280 * \li If successful, secret will contain the derived shared secret.
284 dst_key_fromfile(dns_name_t *name, dns_keytag_t id, unsigned int alg, int type,
285 const char *directory, isc_mem_t *mctx, dst_key_t **keyp);
287 * Reads a key from permanent storage. The key can either be a public or
288 * private key, and is specified by name, algorithm, and id. If a private key
289 * is specified, the public key must also be present. If directory is NULL,
290 * the current directory is assumed.
293 * \li "name" is a valid absolute dns name.
294 * \li "id" is a valid key tag identifier.
295 * \li "alg" is a supported key algorithm.
296 * \li "type" is DST_TYPE_PUBLIC, DST_TYPE_PRIVATE, or the bitwise union.
297 * DST_TYPE_KEY look for a KEY record otherwise DNSKEY
298 * \li "mctx" is a valid memory context.
299 * \li "keyp" is not NULL and "*keyp" is NULL.
303 * \li any other result indicates failure
306 * \li If successful, *keyp will contain a valid key.
310 dst_key_fromnamedfile(const char *filename, const char *dirname,
311 int type, isc_mem_t *mctx, dst_key_t **keyp);
313 * Reads a key from permanent storage. The key can either be a public or
314 * key, and is specified by filename. If a private key is specified, the
315 * public key must also be present.
317 * If 'dirname' is not NULL, and 'filename' is a relative path,
318 * then the file is looked up relative to the given directory.
319 * If 'filename' is an absolute path, 'dirname' is ignored.
322 * \li "filename" is not NULL
323 * \li "type" is DST_TYPE_PUBLIC, DST_TYPE_PRIVATE, or the bitwise union
324 * DST_TYPE_KEY look for a KEY record otherwise DNSKEY
325 * \li "mctx" is a valid memory context
326 * \li "keyp" is not NULL and "*keyp" is NULL.
330 * \li any other result indicates failure
333 * \li If successful, *keyp will contain a valid key.
338 dst_key_read_public(const char *filename, int type,
339 isc_mem_t *mctx, dst_key_t **keyp);
341 * Reads a public key from permanent storage. The key must be a public key.
344 * \li "filename" is not NULL
345 * \li "type" is DST_TYPE_KEY look for a KEY record otherwise DNSKEY
346 * \li "mctx" is a valid memory context
347 * \li "keyp" is not NULL and "*keyp" is NULL.
351 * \li DST_R_BADKEYTYPE if the key type is not the expected one
352 * \li ISC_R_UNEXPECTEDTOKEN if the file can not be parsed as a public key
353 * \li any other result indicates failure
356 * \li If successful, *keyp will contain a valid key.
360 dst_key_tofile(const dst_key_t *key, int type, const char *directory);
362 * Writes a key to permanent storage. The key can either be a public or
363 * private key. Public keys are written in DNS format and private keys
364 * are written as a set of base64 encoded values. If directory is NULL,
365 * the current directory is assumed.
368 * \li "key" is a valid key.
369 * \li "type" is DST_TYPE_PUBLIC, DST_TYPE_PRIVATE, or the bitwise union
373 * \li any other result indicates failure
377 dst_key_fromdns(dns_name_t *name, dns_rdataclass_t rdclass,
378 isc_buffer_t *source, isc_mem_t *mctx, dst_key_t **keyp);
380 * Converts a DNS KEY record into a DST key.
383 * \li "name" is a valid absolute dns name.
384 * \li "source" is a valid buffer. There must be at least 4 bytes available.
385 * \li "mctx" is a valid memory context.
386 * \li "keyp" is not NULL and "*keyp" is NULL.
390 * \li any other result indicates failure
393 * \li If successful, *keyp will contain a valid key, and the consumed
394 * pointer in data will be advanced.
398 dst_key_todns(const dst_key_t *key, isc_buffer_t *target);
400 * Converts a DST key into a DNS KEY record.
403 * \li "key" is a valid key.
404 * \li "target" is a valid buffer. There must be at least 4 bytes unused.
408 * \li any other result indicates failure
411 * \li If successful, the used pointer in 'target' is advanced by at least 4.
415 dst_key_frombuffer(dns_name_t *name, unsigned int alg,
416 unsigned int flags, unsigned int protocol,
417 dns_rdataclass_t rdclass,
418 isc_buffer_t *source, isc_mem_t *mctx, dst_key_t **keyp);
420 * Converts a buffer containing DNS KEY RDATA into a DST key.
423 *\li "name" is a valid absolute dns name.
424 *\li "alg" is a supported key algorithm.
425 *\li "source" is a valid buffer.
426 *\li "mctx" is a valid memory context.
427 *\li "keyp" is not NULL and "*keyp" is NULL.
431 * \li any other result indicates failure
434 *\li If successful, *keyp will contain a valid key, and the consumed
435 * pointer in source will be advanced.
439 dst_key_tobuffer(const dst_key_t *key, isc_buffer_t *target);
441 * Converts a DST key into DNS KEY RDATA format.
444 *\li "key" is a valid key.
445 *\li "target" is a valid buffer.
449 * \li any other result indicates failure
452 *\li If successful, the used pointer in 'target' is advanced.
456 dst_key_privatefrombuffer(dst_key_t *key, isc_buffer_t *buffer);
458 * Converts a public key into a private key, reading the private key
459 * information from the buffer. The buffer should contain the same data
460 * as the .private key file would.
463 *\li "key" is a valid public key.
464 *\li "buffer" is not NULL.
468 * \li any other result indicates failure
471 *\li If successful, key will contain a valid private key.
475 dst_key_getgssctx(const dst_key_t *key);
477 * Returns the opaque key data.
478 * Be cautions when using this value unless you know what you are doing.
481 *\li "key" is not NULL.
484 *\li gssctx key data, possibly NULL.
488 dst_key_fromgssapi(dns_name_t *name, gss_ctx_id_t gssctx, isc_mem_t *mctx,
489 dst_key_t **keyp, isc_region_t *intoken);
491 * Converts a GSSAPI opaque context id into a DST key.
494 *\li "name" is a valid absolute dns name.
495 *\li "gssctx" is a GSSAPI context id.
496 *\li "mctx" is a valid memory context.
497 *\li "keyp" is not NULL and "*keyp" is NULL.
501 * \li any other result indicates failure
504 *\li If successful, *keyp will contain a valid key and be responsible for
508 #ifdef DST_KEY_INTERNAL
510 dst_key_buildinternal(dns_name_t *name, unsigned int alg,
511 unsigned int bits, unsigned int flags,
512 unsigned int protocol, dns_rdataclass_t rdclass,
513 void *data, isc_mem_t *mctx, dst_key_t **keyp);
517 dst_key_fromlabel(dns_name_t *name, int alg, unsigned int flags,
518 unsigned int protocol, dns_rdataclass_t rdclass,
519 const char *engine, const char *label, const char *pin,
520 isc_mem_t *mctx, dst_key_t **keyp);
523 dst_key_generate(dns_name_t *name, unsigned int alg,
524 unsigned int bits, unsigned int param,
525 unsigned int flags, unsigned int protocol,
526 dns_rdataclass_t rdclass,
527 isc_mem_t *mctx, dst_key_t **keyp);
530 dst_key_generate2(dns_name_t *name, unsigned int alg,
531 unsigned int bits, unsigned int param,
532 unsigned int flags, unsigned int protocol,
533 dns_rdataclass_t rdclass,
534 isc_mem_t *mctx, dst_key_t **keyp,
535 void (*callback)(int));
538 * Generate a DST key (or keypair) with the supplied parameters. The
539 * interpretation of the "param" field depends on the algorithm:
543 * !0 use Fermat4 (2^16 + 1)
545 * 0 default - use well known prime if bits == 768 or 1024,
546 * otherwise use 2 as the generator.
547 * !0 use this value as the generator.
550 * 0 default - require good entropy
551 * !0 lack of good entropy is ok
555 *\li "name" is a valid absolute dns name.
556 *\li "keyp" is not NULL and "*keyp" is NULL.
560 * \li any other result indicates failure
563 *\li If successful, *keyp will contain a valid key.
567 dst_key_compare(const dst_key_t *key1, const dst_key_t *key2);
569 * Compares two DST keys. Returns true if they match, false otherwise.
571 * Keys ARE NOT considered to match if one of them is the revoked version
575 *\li "key1" is a valid key.
576 *\li "key2" is a valid key.
584 dst_key_pubcompare(const dst_key_t *key1, const dst_key_t *key2,
585 isc_boolean_t match_revoked_key);
587 * Compares only the public portions of two DST keys. Returns true
588 * if they match, false otherwise. This allows us, for example, to
589 * determine whether a public key found in a zone matches up with a
590 * key pair found on disk.
592 * If match_revoked_key is TRUE, then keys ARE considered to match if one
593 * of them is the revoked version of the other. Otherwise, they are not.
596 *\li "key1" is a valid key.
597 *\li "key2" is a valid key.
605 dst_key_paramcompare(const dst_key_t *key1, const dst_key_t *key2);
607 * Compares the parameters of two DST keys. This is used to determine if
608 * two (Diffie-Hellman) keys can be used to derive a shared secret.
611 *\li "key1" is a valid key.
612 *\li "key2" is a valid key.
620 dst_key_attach(dst_key_t *source, dst_key_t **target);
622 * Attach to a existing key increasing the reference count.
625 *\li 'source' to be a valid key.
626 *\li 'target' to be non-NULL and '*target' to be NULL.
630 dst_key_free(dst_key_t **keyp);
632 * Decrement the key's reference counter and, when it reaches zero,
633 * release all memory associated with the key.
636 *\li "keyp" is not NULL and "*keyp" is a valid key.
637 *\li reference counter greater than zero.
640 *\li All memory associated with "*keyp" will be freed.
645 * Accessor functions to obtain key fields.
648 *\li "key" is a valid key.
651 dst_key_name(const dst_key_t *key);
654 dst_key_size(const dst_key_t *key);
657 dst_key_proto(const dst_key_t *key);
660 dst_key_alg(const dst_key_t *key);
663 dst_key_flags(const dst_key_t *key);
666 dst_key_id(const dst_key_t *key);
669 dst_key_rid(const dst_key_t *key);
672 dst_key_class(const dst_key_t *key);
675 dst_key_isprivate(const dst_key_t *key);
678 dst_key_iszonekey(const dst_key_t *key);
681 dst_key_isnullkey(const dst_key_t *key);
684 dst_key_buildfilename(const dst_key_t *key, int type,
685 const char *directory, isc_buffer_t *out);
687 * Generates the filename used by dst to store the specified key.
688 * If directory is NULL, the current directory is assumed.
691 *\li "key" is a valid key
692 *\li "type" is either DST_TYPE_PUBLIC, DST_TYPE_PRIVATE, or 0 for no suffix.
693 *\li "out" is a valid buffer
696 *\li the file name will be written to "out", and the used pointer will
701 dst_key_sigsize(const dst_key_t *key, unsigned int *n);
703 * Computes the size of a signature generated by the given key.
706 *\li "key" is a valid key.
711 *\li DST_R_UNSUPPORTEDALG
714 *\li "n" stores the size of a generated signature
718 dst_key_secretsize(const dst_key_t *key, unsigned int *n);
720 * Computes the size of a shared secret generated by the given key.
723 *\li "key" is a valid key.
728 *\li DST_R_UNSUPPORTEDALG
731 *\li "n" stores the size of a generated shared secret
735 dst_region_computeid(const isc_region_t *source, unsigned int alg);
737 dst_region_computerid(const isc_region_t *source, unsigned int alg);
739 * Computes the (revoked) key id of the key stored in the provided
740 * region with the given algorithm.
743 *\li "source" contains a valid, non-NULL region.
750 dst_key_getbits(const dst_key_t *key);
752 * Get the number of digest bits required (0 == MAX).
755 * "key" is a valid key.
759 dst_key_setbits(dst_key_t *key, isc_uint16_t bits);
761 * Set the number of digest bits required (0 == MAX).
764 * "key" is a valid key.
768 dst_key_setttl(dst_key_t *key, dns_ttl_t ttl);
770 * Set the default TTL to use when converting the key
771 * to a KEY or DNSKEY RR.
774 * "key" is a valid key.
778 dst_key_getttl(const dst_key_t *key);
780 * Get the default TTL to use when converting the key
781 * to a KEY or DNSKEY RR.
784 * "key" is a valid key.
788 dst_key_setflags(dst_key_t *key, isc_uint32_t flags);
790 * Set the key flags, and recompute the key ID.
793 * "key" is a valid key.
797 dst_key_getnum(const dst_key_t *key, int type, isc_uint32_t *valuep);
799 * Get a member of the numeric metadata array and place it in '*valuep'.
802 * "key" is a valid key.
803 * "type" is no larger than DST_MAX_NUMERIC
804 * "timep" is not null.
808 dst_key_setnum(dst_key_t *key, int type, isc_uint32_t value);
810 * Set a member of the numeric metadata array.
813 * "key" is a valid key.
814 * "type" is no larger than DST_MAX_NUMERIC
818 dst_key_unsetnum(dst_key_t *key, int type);
820 * Flag a member of the numeric metadata array as "not set".
823 * "key" is a valid key.
824 * "type" is no larger than DST_MAX_NUMERIC
828 dst_key_gettime(const dst_key_t *key, int type, isc_stdtime_t *timep);
830 * Get a member of the timing metadata array and place it in '*timep'.
833 * "key" is a valid key.
834 * "type" is no larger than DST_MAX_TIMES
835 * "timep" is not null.
839 dst_key_settime(dst_key_t *key, int type, isc_stdtime_t when);
841 * Set a member of the timing metadata array.
844 * "key" is a valid key.
845 * "type" is no larger than DST_MAX_TIMES
849 dst_key_unsettime(dst_key_t *key, int type);
851 * Flag a member of the timing metadata array as "not set".
854 * "key" is a valid key.
855 * "type" is no larger than DST_MAX_TIMES
859 dst_key_getprivateformat(const dst_key_t *key, int *majorp, int *minorp);
861 * Get the private key format version number. (If the key does not have
862 * a private key associated with it, the version will be 0.0.) The major
863 * version number is placed in '*majorp', and the minor version number in
867 * "key" is a valid key.
868 * "majorp" is not NULL.
869 * "minorp" is not NULL.
873 dst_key_setprivateformat(dst_key_t *key, int major, int minor);
875 * Set the private key format version number.
878 * "key" is a valid key.
881 #define DST_KEY_FORMATSIZE (DNS_NAME_FORMATSIZE + DNS_SECALG_FORMATSIZE + 7)
884 dst_key_format(const dst_key_t *key, char *cp, unsigned int size);
886 * Write the uniquely identifying information about the key (name,
887 * algorithm, key ID) into a string 'cp' of size 'size'.
892 dst_key_tkeytoken(const dst_key_t *key);
894 * Return the token from the TKEY request, if any. If this key was
895 * not negotiated via TKEY, return NULL.
898 * "key" is a valid key.
903 dst_key_dump(dst_key_t *key, isc_mem_t *mctx, char **buffer, int *length);
905 * Allocate 'buffer' and dump the key into it in base64 format. The buffer
906 * is not NUL terminated. The length of the buffer is returned in *length.
908 * 'buffer' needs to be freed using isc_mem_put(mctx, buffer, length);
911 * 'buffer' to be non NULL and *buffer to be NULL.
912 * 'length' to be non NULL and *length to be zero.
917 * ISC_R_NOTIMPLEMENTED
922 dst_key_restore(dns_name_t *name, unsigned int alg, unsigned int flags,
923 unsigned int protocol, dns_rdataclass_t rdclass,
924 isc_mem_t *mctx, const char *keystr, dst_key_t **keyp);
927 dst_key_inactive(const dst_key_t *key);
929 * Determines if the private key is missing due the key being deemed inactive.
936 dst_key_setinactive(dst_key_t *key, isc_boolean_t inactive);
938 * Set key inactive state.
945 dst_key_setexternal(dst_key_t *key, isc_boolean_t value);
948 dst_key_isexternal(dst_key_t *key);
952 #endif /* DST_DST_H */