private.c 10.5 KB
Newer Older
1
/*
Automatic Updater's avatar
Automatic Updater committed
2
 * Copyright (C) 2009, 2011  Internet Systems Consortium, Inc. ("ISC")
3
4
5
6
7
8
9
10
11
12
13
14
15
16
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 */

Mark Andrews's avatar
Mark Andrews committed
17
/* $Id$ */
Automatic Updater's avatar
Automatic Updater committed
18

19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
#include "config.h"

#include <isc/result.h>
#include <isc/string.h>
#include <isc/types.h>
#include <isc/base64.h>

#include <dns/nsec3.h>
#include <dns/private.h>

/*
 * We need to build the relevant chain if there exists a NSEC/NSEC3PARAM
 * at the apex; normally only one or the other of NSEC/NSEC3PARAM will exist.
 *
 * If a NSEC3PARAM RRset exists then we will need to build a NSEC chain
 * if all the NSEC3PARAM records (and associated chains) are slated for
 * destruction and we have not been told to NOT build the NSEC chain.
 *
 * If the NSEC set exist then check to see if there is a request to create
 * a NSEC3 chain.
 *
 * If neither NSEC/NSEC3PARAM RRsets exist at the origin and the private
 * type exists then we need to examine it to determine if NSEC3 chain has
 * been requested to be built otherwise a NSEC chain needs to be built.
 */

#define REMOVE(x) (((x) & DNS_NSEC3FLAG_REMOVE) != 0)
#define CREATE(x) (((x) & DNS_NSEC3FLAG_CREATE) != 0)
47
#define INITIAL(x) (((x) & DNS_NSEC3FLAG_INITIAL) != 0)
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
#define NONSEC(x) (((x) & DNS_NSEC3FLAG_NONSEC) != 0)

#define CHECK(x) do {					\
			 result = (x);			\
			 if (result != ISC_R_SUCCESS)	\
				goto failure;		\
		 } while (0)

/*
 * Work out if 'param' should be ignored or not (i.e. it is in the process
 * of being removed).
 *
 * Note: we 'belt-and-braces' here by also checking for a CREATE private
 * record and keep the param record in this case.
 */

static isc_boolean_t
ignore(dns_rdata_t *param, dns_rdataset_t *privateset) {
	isc_result_t result;
Automatic Updater's avatar
Automatic Updater committed
67

68
69
70
71
72
73
74
75
76
77
78
79
	for (result = dns_rdataset_first(privateset);
	     result == ISC_R_SUCCESS;
	     result = dns_rdataset_next(privateset)) {
		unsigned char buf[DNS_NSEC3PARAM_BUFFERSIZE];
		dns_rdata_t private = DNS_RDATA_INIT;
		dns_rdata_t rdata = DNS_RDATA_INIT;

		dns_rdataset_current(privateset, &private);
		if (!dns_nsec3param_fromprivate(&private, &rdata,
						buf, sizeof(buf)))
			continue;
		/*
Automatic Updater's avatar
Automatic Updater committed
80
		 * We are going to create a new NSEC3 chain so it
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
		 * doesn't matter if we are removing this one.
		 */
		if (CREATE(rdata.data[1]))
			return (ISC_FALSE);
		if (rdata.data[0] != param->data[0] ||
		    rdata.data[2] != param->data[2] ||
		    rdata.data[3] != param->data[3] ||
		    rdata.data[4] != param->data[4] ||
		    memcmp(&rdata.data[5], &param->data[5], param->data[4]))
			continue;
		/*
		 * The removal of this NSEC3 chain does NOT cause a
		 * NSEC chain to be created so we don't need to tell
		 * the caller that it will be removed.
		 */
		if (NONSEC(rdata.data[1]))
			return (ISC_FALSE);
		return (ISC_TRUE);
	}
	return (ISC_FALSE);
}

isc_result_t
dns_private_chains(dns_db_t *db, dns_dbversion_t *ver,
		   dns_rdatatype_t privatetype,
		   isc_boolean_t *build_nsec, isc_boolean_t *build_nsec3)
{
	dns_dbnode_t *node;
	dns_rdataset_t nsecset, nsec3paramset, privateset;
	isc_boolean_t nsec3chain;
	isc_boolean_t signing;
	isc_result_t result;
	unsigned char buf[DNS_NSEC3PARAM_BUFFERSIZE];
	unsigned int count;

	node = NULL;
	dns_rdataset_init(&nsecset);
	dns_rdataset_init(&nsec3paramset);
	dns_rdataset_init(&privateset);

	CHECK(dns_db_getoriginnode(db, &node));

	result = dns_db_findrdataset(db, node, ver, dns_rdatatype_nsec,
				     0, (isc_stdtime_t) 0, &nsecset, NULL);

	if (result != ISC_R_SUCCESS && result != ISC_R_NOTFOUND)
		goto failure;

	result = dns_db_findrdataset(db, node, ver, dns_rdatatype_nsec3param,
				     0, (isc_stdtime_t) 0, &nsec3paramset,
				     NULL);
	if (result != ISC_R_SUCCESS && result != ISC_R_NOTFOUND)
		goto failure;

	if (dns_rdataset_isassociated(&nsecset) &&
	    dns_rdataset_isassociated(&nsec3paramset)) {
		if (build_nsec != NULL)
			*build_nsec = ISC_TRUE;
		if (build_nsec3 != NULL)
			*build_nsec3 = ISC_TRUE;
		goto success;
	}

	if (privatetype != (dns_rdatatype_t)0) {
		result = dns_db_findrdataset(db, node, ver, privatetype,
					     0, (isc_stdtime_t) 0,
					     &privateset, NULL);
		if (result != ISC_R_SUCCESS && result != ISC_R_NOTFOUND)
			goto failure;
	}

	/*
Francis Dupont's avatar
Francis Dupont committed
153
	 * Look to see if we also need to be creating a NSEC3 chain.
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
	 */
	if (dns_rdataset_isassociated(&nsecset)) {
		if (build_nsec != NULL)
			*build_nsec = ISC_TRUE;
		if (build_nsec3 != NULL)
			*build_nsec3 = ISC_FALSE;
		if (!dns_rdataset_isassociated(&privateset))
			goto success;
		for (result = dns_rdataset_first(&privateset);
		     result == ISC_R_SUCCESS;
		     result = dns_rdataset_next(&privateset)) {
			unsigned char buf[DNS_NSEC3PARAM_BUFFERSIZE];
			dns_rdata_t private = DNS_RDATA_INIT;
			dns_rdata_t rdata = DNS_RDATA_INIT;

			dns_rdataset_current(&privateset, &private);
			if (!dns_nsec3param_fromprivate(&private, &rdata,
Automatic Updater's avatar
Automatic Updater committed
171
							buf, sizeof(buf)))
172
173
174
175
176
177
178
179
180
				continue;
			if (REMOVE(rdata.data[1]))
				continue;
			if (build_nsec3 != NULL)
				*build_nsec3 = ISC_TRUE;
			break;
		}
		goto success;
	}
Automatic Updater's avatar
Automatic Updater committed
181

182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
	if (dns_rdataset_isassociated(&nsec3paramset)) {
		if (build_nsec3 != NULL)
			*build_nsec3 = ISC_TRUE;
		if (build_nsec != NULL)
			*build_nsec = ISC_FALSE;
		if (!dns_rdataset_isassociated(&privateset))
			goto success;
		/*
		 * If we are in the process of building a new NSEC3 chain
		 * then we don't need to build a NSEC chain.
		 */
		for (result = dns_rdataset_first(&privateset);
		     result == ISC_R_SUCCESS;
		     result = dns_rdataset_next(&privateset)) {
			dns_rdata_t private = DNS_RDATA_INIT;
			dns_rdata_t rdata = DNS_RDATA_INIT;

			dns_rdataset_current(&privateset, &private);
			if (!dns_nsec3param_fromprivate(&private, &rdata,
							buf, sizeof(buf)))
				continue;
			if (CREATE(rdata.data[1]))
				goto success;
		}
Automatic Updater's avatar
Automatic Updater committed
206

207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
		/*
		 * Check to see if there will be a active NSEC3CHAIN once
		 * the changes queued complete.
		 */
		count = 0;
		for (result = dns_rdataset_first(&nsec3paramset);
		     result == ISC_R_SUCCESS;
		     result = dns_rdataset_next(&nsec3paramset)) {
			dns_rdata_t rdata = DNS_RDATA_INIT;

			/*
			 * If there is more that one NSEC3 chain present then
			 * we don't need to construct a NSEC chain.
			 */
			if (++count > 1)
				goto success;
			dns_rdataset_current(&nsec3paramset, &rdata);
			if (ignore(&rdata, &privateset))
Automatic Updater's avatar
Automatic Updater committed
225
				continue;
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
			/*
			 * We still have a good NSEC3 chain or we are
			 * not creating a NSEC chain as NONSEC is set.
			 */
			goto success;
		}

		/*
		 * The last NSEC3 chain is being removed and does not have
		 * have NONSEC set.
		 */
		if (build_nsec != NULL)
			*build_nsec = ISC_TRUE;
		goto success;
	}

	if (build_nsec != NULL)
		*build_nsec = ISC_FALSE;
	if (build_nsec3 != NULL)
		*build_nsec3 = ISC_FALSE;
	if (!dns_rdataset_isassociated(&privateset))
		goto success;

	signing = ISC_FALSE;
	nsec3chain = ISC_FALSE;

	for (result = dns_rdataset_first(&privateset);
	     result == ISC_R_SUCCESS;
	     result = dns_rdataset_next(&privateset)) {
		dns_rdata_t rdata = DNS_RDATA_INIT;
		dns_rdata_t private = DNS_RDATA_INIT;

		dns_rdataset_current(&privateset, &private);
		if (!dns_nsec3param_fromprivate(&private, &rdata,
						buf, sizeof(buf))) {
			/*
			 * Look for record that says we are signing the
			 * zone with a key.
			 */
			if (private.length == 5 && private.data[0] != 0 &&
			    private.data[3] == 0 && private.data[4] == 0)
				signing = ISC_TRUE;
		} else {
			if (CREATE(rdata.data[1]))
				nsec3chain = ISC_TRUE;
		}
	}

	if (signing) {
		if (nsec3chain) {
			if (build_nsec3 != NULL)
				*build_nsec3 = ISC_TRUE;
		} else {
			if (build_nsec != NULL)
				*build_nsec = ISC_TRUE;
		}
	}

 success:
	result = ISC_R_SUCCESS;
 failure:
	if (dns_rdataset_isassociated(&nsecset))
		dns_rdataset_disassociate(&nsecset);
	if (dns_rdataset_isassociated(&nsec3paramset))
		dns_rdataset_disassociate(&nsec3paramset);
	if (dns_rdataset_isassociated(&privateset))
		dns_rdataset_disassociate(&privateset);
	if (node != NULL)
		dns_db_detachnode(db, &node);
	return (result);
}
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367

isc_result_t
dns_private_totext(dns_rdata_t *private, isc_buffer_t *buf) {
	isc_result_t result;

	if (private->data[0] == 0) {
		unsigned char nsec3buf[DNS_NSEC3PARAM_BUFFERSIZE];
		unsigned char newbuf[DNS_NSEC3PARAM_BUFFERSIZE];
		dns_rdata_t rdata = DNS_RDATA_INIT;
		dns_rdata_nsec3param_t nsec3param;
		isc_boolean_t remove, init, nonsec;
		isc_buffer_t b;

		if (!dns_nsec3param_fromprivate(private, &rdata, nsec3buf,
						sizeof(nsec3buf)))
			CHECK(ISC_R_FAILURE);

		CHECK(dns_rdata_tostruct(&rdata, &nsec3param, NULL));

		remove = ISC_TF((nsec3param.flags & DNS_NSEC3FLAG_REMOVE) != 0);
		init = ISC_TF((nsec3param.flags & DNS_NSEC3FLAG_INITIAL) != 0);
		nonsec = ISC_TF((nsec3param.flags & DNS_NSEC3FLAG_NONSEC) != 0);

		nsec3param.flags &= ~(DNS_NSEC3FLAG_CREATE|
				      DNS_NSEC3FLAG_REMOVE|
				      DNS_NSEC3FLAG_INITIAL|
				      DNS_NSEC3FLAG_NONSEC);

		if (init)
			isc_buffer_putstr(buf, "Pending NSEC3 chain ");
		else if (remove)
			isc_buffer_putstr(buf, "Removing NSEC3 chain ");
		else
			isc_buffer_putstr(buf, "Creating NSEC3 chain ");

		dns_rdata_reset(&rdata);
		isc_buffer_init(&b, newbuf, sizeof(newbuf));
		CHECK(dns_rdata_fromstruct(&rdata, dns_rdataclass_in,
					   dns_rdatatype_nsec3param,
					   &nsec3param, &b));

		CHECK(dns_rdata_totext(&rdata, NULL, buf));

		if (remove && !nonsec)
			isc_buffer_putstr(buf, " / creating NSEC chain");
	} else {
		unsigned char alg = private->data[0];
		dns_keytag_t keyid = (private->data[2] | private->data[1] << 8);
		char keybuf[BUFSIZ], algbuf[DNS_SECALG_FORMATSIZE];
		isc_boolean_t remove = ISC_TF(private->data[3] != 0);
		isc_boolean_t complete = ISC_TF(private->data[4] != 0);

		if (remove && complete)
			isc_buffer_putstr(buf, "Done removing signatures for ");
		else if (remove)
			isc_buffer_putstr(buf, "Removing signatures for ");
		else if (complete)
			isc_buffer_putstr(buf, "Done signing with ");
		else
			isc_buffer_putstr(buf, "Signing with ");

		dns_secalg_format(alg, algbuf, sizeof(algbuf));
		sprintf(keybuf, "key %d/%s", keyid, algbuf);
		isc_buffer_putstr(buf, keybuf);
	}

	isc_buffer_putuint8(buf, 0);
	result = ISC_R_SUCCESS;
 failure:
	return (result);
}