2 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
3 * Copyright (c) 1999-2003 by Internet Software Consortium
5 * Permission to use, copy, modify, and 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
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
12 * 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
15 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 * Internet Systems Consortium, Inc.
19 * Redwood City, CA 94063
24 #if !defined(lint) && !defined(__AROS__)
25 static const char rcsid
[] = "$Id$";
29 #define time(x) trace_mr_time (x)
30 time_t trace_mr_time (time_t *);
35 #include <sys/types.h>
36 #include <sys/param.h>
38 #include <netinet/in.h>
39 #include <arpa/inet.h>
40 #include <sys/socket.h>
50 #include "minires/minires.h"
51 #include "arpa/nameser.h"
53 #include <isc-dhcp/dst.h>
55 #define BOUNDS_CHECK(ptr, count) \
57 if ((ptr) + (count) > eob) { \
58 return ISC_R_NOSPACE; \
64 * msg message to be sent
65 * msglen input - length of message
66 * output - length of signed message
67 * msgsize length of buffer containing message
68 * error value to put in the error field
69 * key tsig key used for signing
70 * querysig (response), the signature in the query
71 * querysiglen (response), the length of the signature in the query
72 * sig a buffer to hold the generated signature
73 * siglen input - length of signature buffer
74 * output - length of signature
77 * - bad input data (-1)
78 * - bad key / sign failed (-BADKEY)
79 * - not enough space (NS_TSIG_ERROR_NO_SPACE)
82 ns_sign(u_char
*msg
, unsigned *msglen
, unsigned msgsize
, int error
, void *k
,
83 const u_char
*querysig
, unsigned querysiglen
, u_char
*sig
,
84 unsigned *siglen
, time_t in_timesigned
)
86 HEADER
*hp
= (HEADER
*)msg
;
87 DST_KEY
*key
= (DST_KEY
*)k
;
88 u_char
*cp
= msg
+ *msglen
, *eob
= msg
+ msgsize
;
95 if (msg
== NULL
|| msglen
== NULL
|| sig
== NULL
|| siglen
== NULL
)
96 return ISC_R_INVALIDARG
;
99 if (key
!= NULL
&& error
!= ns_r_badsig
&& error
!= ns_r_badkey
)
100 n
= dn_comp(key
->dk_key_name
,
101 cp
, (unsigned)(eob
- cp
), NULL
, NULL
);
103 n
= dn_comp("", cp
, (unsigned)(eob
- cp
), NULL
, NULL
);
105 return ISC_R_NOSPACE
;
109 /* Type, class, ttl, length (not filled in yet). */
110 BOUNDS_CHECK(cp
, INT16SZ
+ INT16SZ
+ INT32SZ
+ INT16SZ
);
111 PUTSHORT(ns_t_tsig
, cp
);
112 PUTSHORT(ns_c_any
, cp
);
113 PUTLONG(0, cp
); /* TTL */
118 if (key
!= NULL
&& error
!= ns_r_badsig
&& error
!= ns_r_badkey
) {
119 if (key
->dk_alg
!= KEY_HMAC_MD5
)
121 n
= dn_comp(NS_TSIG_ALG_HMAC_MD5
,
122 cp
, (unsigned)(eob
- cp
), NULL
, NULL
);
125 n
= dn_comp("", cp
, (unsigned)(eob
- cp
), NULL
, NULL
);
127 return ISC_R_NOSPACE
;
132 BOUNDS_CHECK(cp
, INT16SZ
+ INT32SZ
+ INT16SZ
);
134 timesigned
= time(NULL
);
135 if (error
!= ns_r_badtime
)
136 PUTLONG(timesigned
, cp
);
138 PUTLONG(in_timesigned
, cp
);
139 PUTSHORT(NS_TSIG_FUDGE
, cp
);
141 /* Compute the signature. */
142 if (key
!= NULL
&& error
!= ns_r_badsig
&& error
!= ns_r_badkey
) {
144 u_char buf
[MAXDNAME
], *cp2
;
147 dst_sign_data(SIG_MODE_INIT
, key
, &ctx
, NULL
, 0, NULL
, 0);
149 /* Digest the query signature, if this is a response. */
150 if (querysiglen
> 0 && querysig
!= NULL
) {
151 u_int16_t len_n
= htons(querysiglen
);
152 dst_sign_data(SIG_MODE_UPDATE
, key
, &ctx
,
153 (u_char
*)&len_n
, INT16SZ
, NULL
, 0);
154 dst_sign_data(SIG_MODE_UPDATE
, key
, &ctx
,
155 querysig
, querysiglen
, NULL
, 0);
158 /* Digest the message. */
159 dst_sign_data(SIG_MODE_UPDATE
, key
, &ctx
, msg
, *msglen
,
162 /* Digest the key name. */
163 n
= ns_name_ntol(name
, buf
, sizeof(buf
));
164 dst_sign_data(SIG_MODE_UPDATE
, key
, &ctx
, buf
, n
, NULL
, 0);
166 /* Digest the class and TTL. */
168 PUTSHORT(ns_c_any
, cp2
);
170 dst_sign_data(SIG_MODE_UPDATE
, key
, &ctx
,
171 buf
, (unsigned)(cp2
-buf
), NULL
, 0);
173 /* Digest the algorithm. */
174 n
= ns_name_ntol(alg
, buf
, sizeof(buf
));
175 dst_sign_data(SIG_MODE_UPDATE
, key
, &ctx
, buf
, n
, NULL
, 0);
177 /* Digest the time signed, fudge, error, and other data */
179 PUTSHORT(0, cp2
); /* Top 16 bits of time */
180 if (error
!= ns_r_badtime
)
181 PUTLONG(timesigned
, cp2
);
183 PUTLONG(in_timesigned
, cp2
);
184 PUTSHORT(NS_TSIG_FUDGE
, cp2
);
185 PUTSHORT(error
, cp2
); /* Error */
186 if (error
!= ns_r_badtime
)
187 PUTSHORT(0, cp2
); /* Other data length */
189 PUTSHORT(INT16SZ
+INT32SZ
, cp2
); /* Other data length */
190 PUTSHORT(0, cp2
); /* Top 16 bits of time */
191 PUTLONG(timesigned
, cp2
);
193 dst_sign_data(SIG_MODE_UPDATE
, key
, &ctx
,
194 buf
, (unsigned)(cp2
-buf
), NULL
, 0);
196 n
= dst_sign_data(SIG_MODE_FINAL
, key
, &ctx
, NULL
, 0,
204 /* Add the signature. */
205 BOUNDS_CHECK(cp
, INT16SZ
+ (*siglen
));
206 PUTSHORT(*siglen
, cp
);
207 memcpy(cp
, sig
, *siglen
);
210 /* The original message ID & error. */
211 BOUNDS_CHECK(cp
, INT16SZ
+ INT16SZ
);
212 PUTSHORT(ntohs(hp
->id
), cp
); /* already in network order */
216 BOUNDS_CHECK(cp
, INT16SZ
);
217 if (error
!= ns_r_badtime
)
218 PUTSHORT(0, cp
); /* Other data length */
220 PUTSHORT(INT16SZ
+INT32SZ
, cp
); /* Other data length */
221 BOUNDS_CHECK(cp
, INT32SZ
+INT16SZ
);
222 PUTSHORT(0, cp
); /* Top 16 bits of time */
223 PUTLONG(timesigned
, cp
);
226 /* Go back and fill in the length. */
227 PUTSHORT(cp
- lenp
- INT16SZ
, lenp
);
229 hp
->arcount
= htons(ntohs(hp
->arcount
) + 1);
230 *msglen
= (cp
- msg
);
231 return ISC_R_SUCCESS
;
236 ns_sign_tcp_init(void *k
, const u_char
*querysig
, unsigned querysiglen
,
237 ns_tcp_tsig_state
*state
)
240 if (state
== NULL
|| k
== NULL
|| querysig
== NULL
|| querysiglen
< 0)
241 return ISC_R_INVALIDARG
;
244 if (state
->key
->dk_alg
!= KEY_HMAC_MD5
)
246 if (querysiglen
> sizeof(state
->sig
))
247 return ISC_R_NOSPACE
;
248 memcpy(state
->sig
, querysig
, querysiglen
);
249 state
->siglen
= querysiglen
;
250 return ISC_R_SUCCESS
;
254 ns_sign_tcp(u_char
*msg
, unsigned *msglen
, unsigned msgsize
, int error
,
255 ns_tcp_tsig_state
*state
, int done
)
257 u_char
*cp
, *eob
, *lenp
;
258 u_char buf
[MAXDNAME
], *cp2
;
259 HEADER
*hp
= (HEADER
*)msg
;
263 if (msg
== NULL
|| msglen
== NULL
|| state
== NULL
)
264 return ISC_R_INVALIDARG
;
267 if (state
->counter
== 0)
268 return ns_sign(msg
, msglen
, msgsize
, error
, state
->key
,
269 state
->sig
, state
->siglen
,
270 state
->sig
, &state
->siglen
, 0);
272 if (state
->siglen
> 0) {
273 u_int16_t siglen_n
= htons(state
->siglen
);
274 dst_sign_data(SIG_MODE_INIT
, state
->key
, &state
->ctx
,
276 dst_sign_data(SIG_MODE_UPDATE
, state
->key
, &state
->ctx
,
277 (u_char
*)&siglen_n
, INT16SZ
, NULL
, 0);
278 dst_sign_data(SIG_MODE_UPDATE
, state
->key
, &state
->ctx
,
279 state
->sig
, state
->siglen
, NULL
, 0);
283 dst_sign_data(SIG_MODE_UPDATE
, state
->key
, &state
->ctx
, msg
, *msglen
,
286 if (done
== 0 && (state
->counter
% 100 != 0))
287 return ISC_R_SUCCESS
;
293 n
= dn_comp(state
->key
->dk_key_name
,
294 cp
, (unsigned)(eob
- cp
), NULL
, NULL
);
296 return ISC_R_NOSPACE
;
299 /* Type, class, ttl, length (not filled in yet). */
300 BOUNDS_CHECK(cp
, INT16SZ
+ INT16SZ
+ INT32SZ
+ INT16SZ
);
301 PUTSHORT(ns_t_tsig
, cp
);
302 PUTSHORT(ns_c_any
, cp
);
303 PUTLONG(0, cp
); /* TTL */
308 n
= dn_comp(NS_TSIG_ALG_HMAC_MD5
,
309 cp
, (unsigned)(eob
- cp
), NULL
, NULL
);
311 return ISC_R_NOSPACE
;
315 BOUNDS_CHECK(cp
, INT16SZ
+ INT32SZ
+ INT16SZ
);
317 timesigned
= time(NULL
);
318 PUTLONG(timesigned
, cp
);
319 PUTSHORT(NS_TSIG_FUDGE
, cp
);
322 * Compute the signature.
325 /* Digest the time signed and fudge. */
327 PUTSHORT(0, cp2
); /* Top 16 bits of time */
328 PUTLONG(timesigned
, cp2
);
329 PUTSHORT(NS_TSIG_FUDGE
, cp2
);
331 dst_sign_data(SIG_MODE_UPDATE
, state
->key
, &state
->ctx
,
332 buf
, (unsigned)(cp2
- buf
), NULL
, 0);
334 n
= dst_sign_data(SIG_MODE_FINAL
, state
->key
, &state
->ctx
, NULL
, 0,
335 state
->sig
, sizeof(state
->sig
));
340 /* Add the signature. */
341 BOUNDS_CHECK(cp
, INT16SZ
+ state
->siglen
);
342 PUTSHORT(state
->siglen
, cp
);
343 memcpy(cp
, state
->sig
, state
->siglen
);
346 /* The original message ID & error. */
347 BOUNDS_CHECK(cp
, INT16SZ
+ INT16SZ
);
348 PUTSHORT(ntohs(hp
->id
), cp
); /* already in network order */
352 BOUNDS_CHECK(cp
, INT16SZ
);
355 /* Go back and fill in the length. */
356 PUTSHORT(cp
- lenp
- INT16SZ
, lenp
);
358 hp
->arcount
= htons(ntohs(hp
->arcount
) + 1);
359 *msglen
= (cp
- msg
);
360 return ISC_R_SUCCESS
;