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1 /*
2  * Copyright (C) 2004, 2005, 2007, 2009, 2010  Internet Systems Consortium, Inc. ("ISC")
3  * Copyright (C) 2002  Internet Software Consortium.
4  *
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.
8  *
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.
16  */
17
18 /* $Id: ds_43.c,v 1.16 2010-12-23 23:47:08 tbox Exp $ */
19
20 /* draft-ietf-dnsext-delegation-signer-05.txt */
21
22 #ifndef RDATA_GENERIC_DS_43_C
23 #define RDATA_GENERIC_DS_43_C
24
25 #define RRTYPE_DS_ATTRIBUTES \
26         (DNS_RDATATYPEATTR_DNSSEC|DNS_RDATATYPEATTR_ATPARENT)
27
28 #include <isc/sha1.h>
29 #include <isc/sha2.h>
30
31 #include <dns/ds.h>
32
33 static inline isc_result_t
34 fromtext_ds(ARGS_FROMTEXT) {
35         isc_token_t token;
36         unsigned char c;
37         int length;
38
39         REQUIRE(type == 43);
40
41         UNUSED(type);
42         UNUSED(rdclass);
43         UNUSED(origin);
44         UNUSED(options);
45         UNUSED(callbacks);
46
47         /*
48          * Key tag.
49          */
50         RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_number,
51                                       ISC_FALSE));
52         if (token.value.as_ulong > 0xffffU)
53                 RETTOK(ISC_R_RANGE);
54         RETERR(uint16_tobuffer(token.value.as_ulong, target));
55
56         /*
57          * Algorithm.
58          */
59         RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_string,
60                                       ISC_FALSE));
61         RETTOK(dns_secalg_fromtext(&c, &token.value.as_textregion));
62         RETERR(mem_tobuffer(target, &c, 1));
63
64         /*
65          * Digest type.
66          */
67         RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_number,
68                                       ISC_FALSE));
69         if (token.value.as_ulong > 0xffU)
70                 RETTOK(ISC_R_RANGE);
71         RETERR(uint8_tobuffer(token.value.as_ulong, target));
72         c = (unsigned char) token.value.as_ulong;
73
74         /*
75          * Digest.
76          */
77         switch (c) {
78         case DNS_DSDIGEST_SHA1:
79                 length = ISC_SHA1_DIGESTLENGTH;
80                 break;
81         case DNS_DSDIGEST_SHA256:
82                 length = ISC_SHA256_DIGESTLENGTH;
83                 break;
84         case DNS_DSDIGEST_GOST:
85                 length = ISC_GOST_DIGESTLENGTH;
86                 break;
87         default:
88                 length = -1;
89                 break;
90         }
91         return (isc_hex_tobuffer(lexer, target, length));
92 }
93
94 static inline isc_result_t
95 totext_ds(ARGS_TOTEXT) {
96         isc_region_t sr;
97         char buf[sizeof("64000 ")];
98         unsigned int n;
99
100         REQUIRE(rdata->type == 43);
101         REQUIRE(rdata->length != 0);
102
103         UNUSED(tctx);
104
105         dns_rdata_toregion(rdata, &sr);
106
107         /*
108          * Key tag.
109          */
110         n = uint16_fromregion(&sr);
111         isc_region_consume(&sr, 2);
112         sprintf(buf, "%u ", n);
113         RETERR(str_totext(buf, target));
114
115         /*
116          * Algorithm.
117          */
118         n = uint8_fromregion(&sr);
119         isc_region_consume(&sr, 1);
120         sprintf(buf, "%u ", n);
121         RETERR(str_totext(buf, target));
122
123         /*
124          * Digest type.
125          */
126         n = uint8_fromregion(&sr);
127         isc_region_consume(&sr, 1);
128         sprintf(buf, "%u", n);
129         RETERR(str_totext(buf, target));
130
131         /*
132          * Digest.
133          */
134         if ((tctx->flags & DNS_STYLEFLAG_MULTILINE) != 0)
135                 RETERR(str_totext(" (", target));
136         RETERR(str_totext(tctx->linebreak, target));
137         RETERR(isc_hex_totext(&sr, tctx->width - 2, tctx->linebreak, target));
138         if ((tctx->flags & DNS_STYLEFLAG_MULTILINE) != 0)
139                 RETERR(str_totext(" )", target));
140         return (ISC_R_SUCCESS);
141 }
142
143 static inline isc_result_t
144 fromwire_ds(ARGS_FROMWIRE) {
145         isc_region_t sr;
146
147         REQUIRE(type == 43);
148
149         UNUSED(type);
150         UNUSED(rdclass);
151         UNUSED(dctx);
152         UNUSED(options);
153
154         isc_buffer_activeregion(source, &sr);
155
156         /*
157          * Check digest lengths if we know them.
158          */
159         if (sr.length < 4 ||
160             (sr.base[3] == DNS_DSDIGEST_SHA1 &&
161              sr.length < 4 + ISC_SHA1_DIGESTLENGTH) ||
162             (sr.base[3] == DNS_DSDIGEST_SHA256 &&
163              sr.length < 4 + ISC_SHA256_DIGESTLENGTH) ||
164             (sr.base[3] == DNS_DSDIGEST_GOST &&
165              sr.length < 4 + ISC_GOST_DIGESTLENGTH))
166                 return (ISC_R_UNEXPECTEDEND);
167
168         /*
169          * Only copy digest lengths if we know them.
170          * If there is extra data dns_rdata_fromwire() will
171          * detect that.
172          */
173         if (sr.base[3] == DNS_DSDIGEST_SHA1)
174                 sr.length = 4 + ISC_SHA1_DIGESTLENGTH;
175         else if (sr.base[3] == DNS_DSDIGEST_SHA256)
176                 sr.length = 4 + ISC_SHA256_DIGESTLENGTH;
177         else if (sr.base[3] == DNS_DSDIGEST_GOST)
178                 sr.length = 4 + ISC_GOST_DIGESTLENGTH;
179
180         isc_buffer_forward(source, sr.length);
181         return (mem_tobuffer(target, sr.base, sr.length));
182 }
183
184 static inline isc_result_t
185 towire_ds(ARGS_TOWIRE) {
186         isc_region_t sr;
187
188         REQUIRE(rdata->type == 43);
189         REQUIRE(rdata->length != 0);
190
191         UNUSED(cctx);
192
193         dns_rdata_toregion(rdata, &sr);
194         return (mem_tobuffer(target, sr.base, sr.length));
195 }
196
197 static inline int
198 compare_ds(ARGS_COMPARE) {
199         isc_region_t r1;
200         isc_region_t r2;
201
202         REQUIRE(rdata1->type == rdata2->type);
203         REQUIRE(rdata1->rdclass == rdata2->rdclass);
204         REQUIRE(rdata1->type == 43);
205         REQUIRE(rdata1->length != 0);
206         REQUIRE(rdata2->length != 0);
207
208         dns_rdata_toregion(rdata1, &r1);
209         dns_rdata_toregion(rdata2, &r2);
210         return (isc_region_compare(&r1, &r2));
211 }
212
213 static inline isc_result_t
214 fromstruct_ds(ARGS_FROMSTRUCT) {
215         dns_rdata_ds_t *ds = source;
216
217         REQUIRE(type == 43);
218         REQUIRE(source != NULL);
219         REQUIRE(ds->common.rdtype == type);
220         REQUIRE(ds->common.rdclass == rdclass);
221         switch (ds->digest_type) {
222         case DNS_DSDIGEST_SHA1:
223                 REQUIRE(ds->length == ISC_SHA1_DIGESTLENGTH);
224                 break;
225         case DNS_DSDIGEST_SHA256:
226                 REQUIRE(ds->length == ISC_SHA256_DIGESTLENGTH);
227                 break;
228         case DNS_DSDIGEST_GOST:
229                 REQUIRE(ds->length == ISC_GOST_DIGESTLENGTH);
230                 break;
231         }
232
233         UNUSED(type);
234         UNUSED(rdclass);
235
236         RETERR(uint16_tobuffer(ds->key_tag, target));
237         RETERR(uint8_tobuffer(ds->algorithm, target));
238         RETERR(uint8_tobuffer(ds->digest_type, target));
239
240         return (mem_tobuffer(target, ds->digest, ds->length));
241 }
242
243 static inline isc_result_t
244 tostruct_ds(ARGS_TOSTRUCT) {
245         dns_rdata_ds_t *ds = target;
246         isc_region_t region;
247
248         REQUIRE(rdata->type == 43);
249         REQUIRE(target != NULL);
250         REQUIRE(rdata->length != 0);
251
252         ds->common.rdclass = rdata->rdclass;
253         ds->common.rdtype = rdata->type;
254         ISC_LINK_INIT(&ds->common, link);
255
256         dns_rdata_toregion(rdata, &region);
257
258         ds->key_tag = uint16_fromregion(&region);
259         isc_region_consume(&region, 2);
260         ds->algorithm = uint8_fromregion(&region);
261         isc_region_consume(&region, 1);
262         ds->digest_type = uint8_fromregion(&region);
263         isc_region_consume(&region, 1);
264         ds->length = region.length;
265
266         ds->digest = mem_maybedup(mctx, region.base, region.length);
267         if (ds->digest == NULL)
268                 return (ISC_R_NOMEMORY);
269
270         ds->mctx = mctx;
271         return (ISC_R_SUCCESS);
272 }
273
274 static inline void
275 freestruct_ds(ARGS_FREESTRUCT) {
276         dns_rdata_ds_t *ds = source;
277
278         REQUIRE(ds != NULL);
279         REQUIRE(ds->common.rdtype == 43);
280
281         if (ds->mctx == NULL)
282                 return;
283
284         if (ds->digest != NULL)
285                 isc_mem_free(ds->mctx, ds->digest);
286         ds->mctx = NULL;
287 }
288
289 static inline isc_result_t
290 additionaldata_ds(ARGS_ADDLDATA) {
291         REQUIRE(rdata->type == 43);
292
293         UNUSED(rdata);
294         UNUSED(add);
295         UNUSED(arg);
296
297         return (ISC_R_SUCCESS);
298 }
299
300 static inline isc_result_t
301 digest_ds(ARGS_DIGEST) {
302         isc_region_t r;
303
304         REQUIRE(rdata->type == 43);
305
306         dns_rdata_toregion(rdata, &r);
307
308         return ((digest)(arg, &r));
309 }
310
311 static inline isc_boolean_t
312 checkowner_ds(ARGS_CHECKOWNER) {
313
314         REQUIRE(type == 43);
315
316         UNUSED(name);
317         UNUSED(type);
318         UNUSED(rdclass);
319         UNUSED(wildcard);
320
321         return (ISC_TRUE);
322 }
323
324 static inline isc_boolean_t
325 checknames_ds(ARGS_CHECKNAMES) {
326
327         REQUIRE(rdata->type == 43);
328
329         UNUSED(rdata);
330         UNUSED(owner);
331         UNUSED(bad);
332
333         return (ISC_TRUE);
334 }
335
336 static inline int
337 casecompare_ds(ARGS_COMPARE) {
338         return (compare_ds(rdata1, rdata2));
339 }
340
341 #endif  /* RDATA_GENERIC_DS_43_C */