Branch data Line data Source code
1 : : /* SPDX-License-Identifier: LGPL-2.1+ */
2 : :
3 : : #include "sd-messages.h"
4 : :
5 : : #include "alloc-util.h"
6 : : #include "conf-files.h"
7 : : #include "def.h"
8 : : #include "dns-domain.h"
9 : : #include "fd-util.h"
10 : : #include "fileio.h"
11 : : #include "hexdecoct.h"
12 : : #include "nulstr-util.h"
13 : : #include "parse-util.h"
14 : : #include "resolved-dns-dnssec.h"
15 : : #include "resolved-dns-trust-anchor.h"
16 : : #include "set.h"
17 : : #include "sort-util.h"
18 : : #include "string-util.h"
19 : : #include "strv.h"
20 : :
21 : : static const char trust_anchor_dirs[] = CONF_PATHS_NULSTR("dnssec-trust-anchors.d");
22 : :
23 : : /* The first DS RR from https://data.iana.org/root-anchors/root-anchors.xml, retrieved December 2015 */
24 : : static const uint8_t root_digest1[] =
25 : : { 0x49, 0xAA, 0xC1, 0x1D, 0x7B, 0x6F, 0x64, 0x46, 0x70, 0x2E, 0x54, 0xA1, 0x60, 0x73, 0x71, 0x60,
26 : : 0x7A, 0x1A, 0x41, 0x85, 0x52, 0x00, 0xFD, 0x2C, 0xE1, 0xCD, 0xDE, 0x32, 0xF2, 0x4E, 0x8F, 0xB5 };
27 : :
28 : : /* The second DS RR from https://data.iana.org/root-anchors/root-anchors.xml, retrieved February 2017 */
29 : : static const uint8_t root_digest2[] =
30 : : { 0xE0, 0x6D, 0x44, 0xB8, 0x0B, 0x8F, 0x1D, 0x39, 0xA9, 0x5C, 0x0B, 0x0D, 0x7C, 0x65, 0xD0, 0x84,
31 : : 0x58, 0xE8, 0x80, 0x40, 0x9B, 0xBC, 0x68, 0x34, 0x57, 0x10, 0x42, 0x37, 0xC7, 0xF8, 0xEC, 0x8D };
32 : :
33 : 0 : static bool dns_trust_anchor_knows_domain_positive(DnsTrustAnchor *d, const char *name) {
34 [ # # ]: 0 : assert(d);
35 : :
36 : : /* Returns true if there's an entry for the specified domain
37 : : * name in our trust anchor */
38 : :
39 : : return
40 [ # # # # ]: 0 : hashmap_contains(d->positive_by_key, &DNS_RESOURCE_KEY_CONST(DNS_CLASS_IN, DNS_TYPE_DNSKEY, name)) ||
41 : 0 : hashmap_contains(d->positive_by_key, &DNS_RESOURCE_KEY_CONST(DNS_CLASS_IN, DNS_TYPE_DS, name));
42 : : }
43 : :
44 : 0 : static int add_root_ksk(
45 : : DnsAnswer *answer,
46 : : DnsResourceKey *key,
47 : : uint16_t key_tag,
48 : : uint8_t algorithm,
49 : : uint8_t digest_type,
50 : : const void *digest,
51 : : size_t digest_size) {
52 : :
53 : 0 : _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *rr = NULL;
54 : : int r;
55 : :
56 : 0 : rr = dns_resource_record_new(key);
57 [ # # ]: 0 : if (!rr)
58 : 0 : return -ENOMEM;
59 : :
60 : 0 : rr->ds.key_tag = key_tag;
61 : 0 : rr->ds.algorithm = algorithm;
62 : 0 : rr->ds.digest_type = digest_type;
63 : 0 : rr->ds.digest_size = digest_size;
64 : 0 : rr->ds.digest = memdup(digest, rr->ds.digest_size);
65 [ # # ]: 0 : if (!rr->ds.digest)
66 : 0 : return -ENOMEM;
67 : :
68 : 0 : r = dns_answer_add(answer, rr, 0, DNS_ANSWER_AUTHENTICATED);
69 [ # # ]: 0 : if (r < 0)
70 : 0 : return r;
71 : :
72 : 0 : return 0;
73 : : }
74 : :
75 : 0 : static int dns_trust_anchor_add_builtin_positive(DnsTrustAnchor *d) {
76 : 0 : _cleanup_(dns_answer_unrefp) DnsAnswer *answer = NULL;
77 : 0 : _cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL;
78 : : int r;
79 : :
80 [ # # ]: 0 : assert(d);
81 : :
82 : 0 : r = hashmap_ensure_allocated(&d->positive_by_key, &dns_resource_key_hash_ops);
83 [ # # ]: 0 : if (r < 0)
84 : 0 : return r;
85 : :
86 : : /* Only add the built-in trust anchor if there's neither a DS nor a DNSKEY defined for the root domain. That
87 : : * way users have an easy way to override the root domain DS/DNSKEY data. */
88 [ # # ]: 0 : if (dns_trust_anchor_knows_domain_positive(d, "."))
89 : 0 : return 0;
90 : :
91 : 0 : key = dns_resource_key_new(DNS_CLASS_IN, DNS_TYPE_DS, "");
92 [ # # ]: 0 : if (!key)
93 : 0 : return -ENOMEM;
94 : :
95 : 0 : answer = dns_answer_new(2);
96 [ # # ]: 0 : if (!answer)
97 : 0 : return -ENOMEM;
98 : :
99 : : /* Add the two RRs from https://data.iana.org/root-anchors/root-anchors.xml */
100 : 0 : r = add_root_ksk(answer, key, 19036, DNSSEC_ALGORITHM_RSASHA256, DNSSEC_DIGEST_SHA256, root_digest1, sizeof(root_digest1));
101 [ # # ]: 0 : if (r < 0)
102 : 0 : return r;
103 : :
104 : 0 : r = add_root_ksk(answer, key, 20326, DNSSEC_ALGORITHM_RSASHA256, DNSSEC_DIGEST_SHA256, root_digest2, sizeof(root_digest2));
105 [ # # ]: 0 : if (r < 0)
106 : 0 : return r;
107 : :
108 : 0 : r = hashmap_put(d->positive_by_key, key, answer);
109 [ # # ]: 0 : if (r < 0)
110 : 0 : return r;
111 : :
112 : 0 : answer = NULL;
113 : 0 : return 0;
114 : : }
115 : :
116 : 0 : static int dns_trust_anchor_add_builtin_negative(DnsTrustAnchor *d) {
117 : :
118 : : static const char private_domains[] =
119 : : /* RFC 6761 says that .test is a special domain for
120 : : * testing and not to be installed in the root zone */
121 : : "test\0"
122 : :
123 : : /* RFC 6761 says that these reverse IP lookup ranges
124 : : * are for private addresses, and hence should not
125 : : * show up in the root zone */
126 : : "10.in-addr.arpa\0"
127 : : "16.172.in-addr.arpa\0"
128 : : "17.172.in-addr.arpa\0"
129 : : "18.172.in-addr.arpa\0"
130 : : "19.172.in-addr.arpa\0"
131 : : "20.172.in-addr.arpa\0"
132 : : "21.172.in-addr.arpa\0"
133 : : "22.172.in-addr.arpa\0"
134 : : "23.172.in-addr.arpa\0"
135 : : "24.172.in-addr.arpa\0"
136 : : "25.172.in-addr.arpa\0"
137 : : "26.172.in-addr.arpa\0"
138 : : "27.172.in-addr.arpa\0"
139 : : "28.172.in-addr.arpa\0"
140 : : "29.172.in-addr.arpa\0"
141 : : "30.172.in-addr.arpa\0"
142 : : "31.172.in-addr.arpa\0"
143 : : "168.192.in-addr.arpa\0"
144 : :
145 : : /* The same, but for IPv6. */
146 : : "d.f.ip6.arpa\0"
147 : :
148 : : /* RFC 6762 reserves the .local domain for Multicast
149 : : * DNS, it hence cannot appear in the root zone. (Note
150 : : * that we by default do not route .local traffic to
151 : : * DNS anyway, except when a configured search domain
152 : : * suggests so.) */
153 : : "local\0"
154 : :
155 : : /* These two are well known, popular private zone
156 : : * TLDs, that are blocked from delegation, according
157 : : * to:
158 : : * http://icannwiki.com/Name_Collision#NGPC_Resolution
159 : : *
160 : : * There's also ongoing work on making this official
161 : : * in an RRC:
162 : : * https://www.ietf.org/archive/id/draft-chapin-additional-reserved-tlds-02.txt */
163 : : "home\0"
164 : : "corp\0"
165 : :
166 : : /* The following four TLDs are suggested for private
167 : : * zones in RFC 6762, Appendix G, and are hence very
168 : : * unlikely to be made official TLDs any day soon */
169 : : "lan\0"
170 : : "intranet\0"
171 : : "internal\0"
172 : : "private\0";
173 : :
174 : : const char *name;
175 : : int r;
176 : :
177 [ # # ]: 0 : assert(d);
178 : :
179 : : /* Only add the built-in trust anchor if there's no negative
180 : : * trust anchor defined at all. This enables easy overriding
181 : : * of negative trust anchors. */
182 : :
183 [ # # ]: 0 : if (set_size(d->negative_by_name) > 0)
184 : 0 : return 0;
185 : :
186 : 0 : r = set_ensure_allocated(&d->negative_by_name, &dns_name_hash_ops);
187 [ # # ]: 0 : if (r < 0)
188 : 0 : return r;
189 : :
190 : : /* We add a couple of domains as default negative trust
191 : : * anchors, where it's very unlikely they will be installed in
192 : : * the root zone. If they exist they must be private, and thus
193 : : * unsigned. */
194 : :
195 [ # # # # ]: 0 : NULSTR_FOREACH(name, private_domains) {
196 : :
197 [ # # ]: 0 : if (dns_trust_anchor_knows_domain_positive(d, name))
198 : 0 : continue;
199 : :
200 : 0 : r = set_put_strdup(d->negative_by_name, name);
201 [ # # ]: 0 : if (r < 0)
202 : 0 : return r;
203 : : }
204 : :
205 : 0 : return 0;
206 : : }
207 : :
208 : 0 : static int dns_trust_anchor_load_positive(DnsTrustAnchor *d, const char *path, unsigned line, const char *s) {
209 : 0 : _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *rr = NULL;
210 : 0 : _cleanup_free_ char *domain = NULL, *class = NULL, *type = NULL;
211 : 0 : _cleanup_(dns_answer_unrefp) DnsAnswer *answer = NULL;
212 : 0 : DnsAnswer *old_answer = NULL;
213 : 0 : const char *p = s;
214 : : int r;
215 : :
216 [ # # ]: 0 : assert(d);
217 [ # # ]: 0 : assert(line);
218 : :
219 : 0 : r = extract_first_word(&p, &domain, NULL, EXTRACT_UNQUOTE);
220 [ # # ]: 0 : if (r < 0)
221 [ # # ]: 0 : return log_warning_errno(r, "Unable to parse domain in line %s:%u: %m", path, line);
222 : :
223 : 0 : r = dns_name_is_valid(domain);
224 [ # # ]: 0 : if (r < 0)
225 [ # # ]: 0 : return log_warning_errno(r, "Failed to check validity of domain name '%s', at line %s:%u, ignoring line: %m", domain, path, line);
226 [ # # ]: 0 : if (r == 0) {
227 [ # # ]: 0 : log_warning("Domain name %s is invalid, at line %s:%u, ignoring line.", domain, path, line);
228 : 0 : return -EINVAL;
229 : : }
230 : :
231 : 0 : r = extract_many_words(&p, NULL, 0, &class, &type, NULL);
232 [ # # ]: 0 : if (r < 0)
233 [ # # ]: 0 : return log_warning_errno(r, "Unable to parse class and type in line %s:%u: %m", path, line);
234 [ # # ]: 0 : if (r != 2) {
235 [ # # ]: 0 : log_warning("Missing class or type in line %s:%u", path, line);
236 : 0 : return -EINVAL;
237 : : }
238 : :
239 [ # # ]: 0 : if (!strcaseeq(class, "IN")) {
240 [ # # ]: 0 : log_warning("RR class %s is not supported, ignoring line %s:%u.", class, path, line);
241 : 0 : return -EINVAL;
242 : : }
243 : :
244 [ # # ]: 0 : if (strcaseeq(type, "DS")) {
245 [ # # # # : 0 : _cleanup_free_ char *key_tag = NULL, *algorithm = NULL, *digest_type = NULL;
# # ]
246 [ # # ]: 0 : _cleanup_free_ void *dd = NULL;
247 : : uint16_t kt;
248 : : int a, dt;
249 : : size_t l;
250 : :
251 : 0 : r = extract_many_words(&p, NULL, 0, &key_tag, &algorithm, &digest_type, NULL);
252 [ # # ]: 0 : if (r < 0) {
253 [ # # ]: 0 : log_warning_errno(r, "Failed to parse DS parameters on line %s:%u: %m", path, line);
254 : 0 : return -EINVAL;
255 : : }
256 [ # # ]: 0 : if (r != 3) {
257 [ # # ]: 0 : log_warning("Missing DS parameters on line %s:%u", path, line);
258 : 0 : return -EINVAL;
259 : : }
260 : :
261 : 0 : r = safe_atou16(key_tag, &kt);
262 [ # # ]: 0 : if (r < 0)
263 [ # # ]: 0 : return log_warning_errno(r, "Failed to parse DS key tag %s on line %s:%u: %m", key_tag, path, line);
264 : :
265 : 0 : a = dnssec_algorithm_from_string(algorithm);
266 [ # # ]: 0 : if (a < 0) {
267 [ # # ]: 0 : log_warning("Failed to parse DS algorithm %s on line %s:%u", algorithm, path, line);
268 : 0 : return -EINVAL;
269 : : }
270 : :
271 : 0 : dt = dnssec_digest_from_string(digest_type);
272 [ # # ]: 0 : if (dt < 0) {
273 [ # # ]: 0 : log_warning("Failed to parse DS digest type %s on line %s:%u", digest_type, path, line);
274 : 0 : return -EINVAL;
275 : : }
276 : :
277 [ # # ]: 0 : if (isempty(p)) {
278 [ # # ]: 0 : log_warning("Missing DS digest on line %s:%u", path, line);
279 : 0 : return -EINVAL;
280 : : }
281 : :
282 : 0 : r = unhexmem(p, strlen(p), &dd, &l);
283 [ # # ]: 0 : if (r < 0) {
284 [ # # ]: 0 : log_warning("Failed to parse DS digest %s on line %s:%u", p, path, line);
285 : 0 : return -EINVAL;
286 : : }
287 : :
288 : 0 : rr = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_DS, domain);
289 [ # # ]: 0 : if (!rr)
290 : 0 : return log_oom();
291 : :
292 : 0 : rr->ds.key_tag = kt;
293 : 0 : rr->ds.algorithm = a;
294 : 0 : rr->ds.digest_type = dt;
295 : 0 : rr->ds.digest_size = l;
296 : 0 : rr->ds.digest = TAKE_PTR(dd);
297 : :
298 [ # # ]: 0 : } else if (strcaseeq(type, "DNSKEY")) {
299 [ # # # # : 0 : _cleanup_free_ char *flags = NULL, *protocol = NULL, *algorithm = NULL;
# # ]
300 [ # # ]: 0 : _cleanup_free_ void *k = NULL;
301 : : uint16_t f;
302 : : size_t l;
303 : : int a;
304 : :
305 : 0 : r = extract_many_words(&p, NULL, 0, &flags, &protocol, &algorithm, NULL);
306 [ # # ]: 0 : if (r < 0)
307 [ # # ]: 0 : return log_warning_errno(r, "Failed to parse DNSKEY parameters on line %s:%u: %m", path, line);
308 [ # # ]: 0 : if (r != 3) {
309 [ # # ]: 0 : log_warning("Missing DNSKEY parameters on line %s:%u", path, line);
310 : 0 : return -EINVAL;
311 : : }
312 : :
313 [ # # ]: 0 : if (!streq(protocol, "3")) {
314 [ # # ]: 0 : log_warning("DNSKEY Protocol is not 3 on line %s:%u", path, line);
315 : 0 : return -EINVAL;
316 : : }
317 : :
318 : 0 : r = safe_atou16(flags, &f);
319 [ # # ]: 0 : if (r < 0)
320 [ # # ]: 0 : return log_warning_errno(r, "Failed to parse DNSKEY flags field %s on line %s:%u", flags, path, line);
321 [ # # ]: 0 : if ((f & DNSKEY_FLAG_ZONE_KEY) == 0) {
322 [ # # ]: 0 : log_warning("DNSKEY lacks zone key bit set on line %s:%u", path, line);
323 : 0 : return -EINVAL;
324 : : }
325 [ # # ]: 0 : if ((f & DNSKEY_FLAG_REVOKE)) {
326 [ # # ]: 0 : log_warning("DNSKEY is already revoked on line %s:%u", path, line);
327 : 0 : return -EINVAL;
328 : : }
329 : :
330 : 0 : a = dnssec_algorithm_from_string(algorithm);
331 [ # # ]: 0 : if (a < 0) {
332 [ # # ]: 0 : log_warning("Failed to parse DNSKEY algorithm %s on line %s:%u", algorithm, path, line);
333 : 0 : return -EINVAL;
334 : : }
335 : :
336 [ # # ]: 0 : if (isempty(p)) {
337 [ # # ]: 0 : log_warning("Missing DNSKEY key on line %s:%u", path, line);
338 : 0 : return -EINVAL;
339 : : }
340 : :
341 : 0 : r = unbase64mem(p, strlen(p), &k, &l);
342 [ # # ]: 0 : if (r < 0)
343 [ # # ]: 0 : return log_warning_errno(r, "Failed to parse DNSKEY key data %s on line %s:%u", p, path, line);
344 : :
345 : 0 : rr = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_DNSKEY, domain);
346 [ # # ]: 0 : if (!rr)
347 : 0 : return log_oom();
348 : :
349 : 0 : rr->dnskey.flags = f;
350 : 0 : rr->dnskey.protocol = 3;
351 : 0 : rr->dnskey.algorithm = a;
352 : 0 : rr->dnskey.key_size = l;
353 : 0 : rr->dnskey.key = TAKE_PTR(k);
354 : :
355 : : } else {
356 [ # # ]: 0 : log_warning("RR type %s is not supported, ignoring line %s:%u.", type, path, line);
357 : 0 : return -EINVAL;
358 : : }
359 : :
360 : 0 : r = hashmap_ensure_allocated(&d->positive_by_key, &dns_resource_key_hash_ops);
361 [ # # ]: 0 : if (r < 0)
362 : 0 : return log_oom();
363 : :
364 : 0 : old_answer = hashmap_get(d->positive_by_key, rr->key);
365 : 0 : answer = dns_answer_ref(old_answer);
366 : :
367 : 0 : r = dns_answer_add_extend(&answer, rr, 0, DNS_ANSWER_AUTHENTICATED);
368 [ # # ]: 0 : if (r < 0)
369 [ # # ]: 0 : return log_error_errno(r, "Failed to add trust anchor RR: %m");
370 : :
371 : 0 : r = hashmap_replace(d->positive_by_key, rr->key, answer);
372 [ # # ]: 0 : if (r < 0)
373 [ # # ]: 0 : return log_error_errno(r, "Failed to add answer to trust anchor: %m");
374 : :
375 : 0 : old_answer = dns_answer_unref(old_answer);
376 : 0 : answer = NULL;
377 : :
378 : 0 : return 0;
379 : : }
380 : :
381 : 0 : static int dns_trust_anchor_load_negative(DnsTrustAnchor *d, const char *path, unsigned line, const char *s) {
382 : 0 : _cleanup_free_ char *domain = NULL;
383 : 0 : const char *p = s;
384 : : int r;
385 : :
386 [ # # ]: 0 : assert(d);
387 [ # # ]: 0 : assert(line);
388 : :
389 : 0 : r = extract_first_word(&p, &domain, NULL, EXTRACT_UNQUOTE);
390 [ # # ]: 0 : if (r < 0)
391 [ # # ]: 0 : return log_warning_errno(r, "Unable to parse line %s:%u: %m", path, line);
392 : :
393 : 0 : r = dns_name_is_valid(domain);
394 [ # # ]: 0 : if (r < 0)
395 [ # # ]: 0 : return log_warning_errno(r, "Failed to check validity of domain name '%s', at line %s:%u, ignoring line: %m", domain, path, line);
396 [ # # ]: 0 : if (r == 0) {
397 [ # # ]: 0 : log_warning("Domain name %s is invalid, at line %s:%u, ignoring line.", domain, path, line);
398 : 0 : return -EINVAL;
399 : : }
400 : :
401 [ # # ]: 0 : if (!isempty(p)) {
402 [ # # ]: 0 : log_warning("Trailing garbage at line %s:%u, ignoring line.", path, line);
403 : 0 : return -EINVAL;
404 : : }
405 : :
406 : 0 : r = set_ensure_allocated(&d->negative_by_name, &dns_name_hash_ops);
407 [ # # ]: 0 : if (r < 0)
408 : 0 : return log_oom();
409 : :
410 : 0 : r = set_put(d->negative_by_name, domain);
411 [ # # ]: 0 : if (r < 0)
412 : 0 : return log_oom();
413 [ # # ]: 0 : if (r > 0)
414 : 0 : domain = NULL;
415 : :
416 : 0 : return 0;
417 : : }
418 : :
419 : 0 : static int dns_trust_anchor_load_files(
420 : : DnsTrustAnchor *d,
421 : : const char *suffix,
422 : : int (*loader)(DnsTrustAnchor *d, const char *path, unsigned n, const char *line)) {
423 : :
424 : 0 : _cleanup_strv_free_ char **files = NULL;
425 : : char **f;
426 : : int r;
427 : :
428 [ # # ]: 0 : assert(d);
429 [ # # ]: 0 : assert(suffix);
430 [ # # ]: 0 : assert(loader);
431 : :
432 : 0 : r = conf_files_list_nulstr(&files, suffix, NULL, 0, trust_anchor_dirs);
433 [ # # ]: 0 : if (r < 0)
434 [ # # ]: 0 : return log_error_errno(r, "Failed to enumerate %s trust anchor files: %m", suffix);
435 : :
436 [ # # # # ]: 0 : STRV_FOREACH(f, files) {
437 [ # # ]: 0 : _cleanup_fclose_ FILE *g = NULL;
438 : 0 : unsigned n = 0;
439 : :
440 : 0 : g = fopen(*f, "r");
441 [ # # ]: 0 : if (!g) {
442 [ # # ]: 0 : if (errno == ENOENT)
443 : 0 : continue;
444 : :
445 [ # # ]: 0 : log_warning_errno(errno, "Failed to open '%s', ignoring: %m", *f);
446 : 0 : continue;
447 : : }
448 : :
449 : 0 : for (;;) {
450 [ # # # ]: 0 : _cleanup_free_ char *line = NULL;
451 : : char *l;
452 : :
453 : 0 : r = read_line(g, LONG_LINE_MAX, &line);
454 [ # # ]: 0 : if (r < 0) {
455 [ # # ]: 0 : log_warning_errno(r, "Failed to read '%s', ignoring: %m", *f);
456 : 0 : break;
457 : : }
458 [ # # ]: 0 : if (r == 0)
459 : 0 : break;
460 : :
461 : 0 : n++;
462 : :
463 : 0 : l = strstrip(line);
464 [ # # ]: 0 : if (isempty(l))
465 : 0 : continue;
466 : :
467 [ # # ]: 0 : if (*l == ';')
468 : 0 : continue;
469 : :
470 : 0 : (void) loader(d, *f, n, l);
471 : : }
472 : : }
473 : :
474 : 0 : return 0;
475 : : }
476 : :
477 : 0 : static int domain_name_cmp(char * const *a, char * const *b) {
478 : 0 : return dns_name_compare_func(*a, *b);
479 : : }
480 : :
481 : 0 : static int dns_trust_anchor_dump(DnsTrustAnchor *d) {
482 : : DnsAnswer *a;
483 : : Iterator i;
484 : :
485 [ # # ]: 0 : assert(d);
486 : :
487 [ # # ]: 0 : if (hashmap_isempty(d->positive_by_key))
488 [ # # ]: 0 : log_info("No positive trust anchors defined.");
489 : : else {
490 [ # # ]: 0 : log_info("Positive Trust Anchors:");
491 [ # # ]: 0 : HASHMAP_FOREACH(a, d->positive_by_key, i) {
492 : : DnsResourceRecord *rr;
493 : :
494 [ # # # # : 0 : DNS_ANSWER_FOREACH(rr, a)
# # # # ]
495 [ # # # # ]: 0 : log_info("%s", dns_resource_record_to_string(rr));
496 : : }
497 : : }
498 : :
499 [ # # ]: 0 : if (set_isempty(d->negative_by_name))
500 [ # # ]: 0 : log_info("No negative trust anchors defined.");
501 : : else {
502 [ # # # # ]: 0 : _cleanup_free_ char **l = NULL, *j = NULL;
503 : :
504 : 0 : l = set_get_strv(d->negative_by_name);
505 [ # # ]: 0 : if (!l)
506 : 0 : return log_oom();
507 : :
508 : 0 : typesafe_qsort(l, set_size(d->negative_by_name), domain_name_cmp);
509 : :
510 : 0 : j = strv_join(l, " ");
511 [ # # ]: 0 : if (!j)
512 : 0 : return log_oom();
513 : :
514 [ # # ]: 0 : log_info("Negative trust anchors: %s", j);
515 : : }
516 : :
517 : 0 : return 0;
518 : : }
519 : :
520 : 0 : int dns_trust_anchor_load(DnsTrustAnchor *d) {
521 : : int r;
522 : :
523 [ # # ]: 0 : assert(d);
524 : :
525 : : /* If loading things from disk fails, we don't consider this fatal */
526 : 0 : (void) dns_trust_anchor_load_files(d, ".positive", dns_trust_anchor_load_positive);
527 : 0 : (void) dns_trust_anchor_load_files(d, ".negative", dns_trust_anchor_load_negative);
528 : :
529 : : /* However, if the built-in DS fails, then we have a problem. */
530 : 0 : r = dns_trust_anchor_add_builtin_positive(d);
531 [ # # ]: 0 : if (r < 0)
532 [ # # ]: 0 : return log_error_errno(r, "Failed to add built-in positive trust anchor: %m");
533 : :
534 : 0 : r = dns_trust_anchor_add_builtin_negative(d);
535 [ # # ]: 0 : if (r < 0)
536 [ # # ]: 0 : return log_error_errno(r, "Failed to add built-in negative trust anchor: %m");
537 : :
538 : 0 : dns_trust_anchor_dump(d);
539 : :
540 : 0 : return 0;
541 : : }
542 : :
543 : 0 : void dns_trust_anchor_flush(DnsTrustAnchor *d) {
544 [ # # ]: 0 : assert(d);
545 : :
546 [ # # ]: 0 : d->positive_by_key = hashmap_free_with_destructor(d->positive_by_key, dns_answer_unref);
547 [ # # ]: 0 : d->revoked_by_rr = set_free_with_destructor(d->revoked_by_rr, dns_resource_record_unref);
548 : 0 : d->negative_by_name = set_free_free(d->negative_by_name);
549 : 0 : }
550 : :
551 : 0 : int dns_trust_anchor_lookup_positive(DnsTrustAnchor *d, const DnsResourceKey *key, DnsAnswer **ret) {
552 : : DnsAnswer *a;
553 : :
554 [ # # ]: 0 : assert(d);
555 [ # # ]: 0 : assert(key);
556 [ # # ]: 0 : assert(ret);
557 : :
558 : : /* We only serve DS and DNSKEY RRs. */
559 [ # # # # ]: 0 : if (!IN_SET(key->type, DNS_TYPE_DS, DNS_TYPE_DNSKEY))
560 : 0 : return 0;
561 : :
562 : 0 : a = hashmap_get(d->positive_by_key, key);
563 [ # # ]: 0 : if (!a)
564 : 0 : return 0;
565 : :
566 : 0 : *ret = dns_answer_ref(a);
567 : 0 : return 1;
568 : : }
569 : :
570 : 0 : int dns_trust_anchor_lookup_negative(DnsTrustAnchor *d, const char *name) {
571 : : int r;
572 : :
573 [ # # ]: 0 : assert(d);
574 [ # # ]: 0 : assert(name);
575 : :
576 : : for (;;) {
577 : : /* If the domain is listed as-is in the NTA database, then that counts */
578 [ # # ]: 0 : if (set_contains(d->negative_by_name, name))
579 : 0 : return true;
580 : :
581 : : /* If the domain isn't listed as NTA, but is listed as positive trust anchor, then that counts. See RFC
582 : : * 7646, section 1.1 */
583 [ # # ]: 0 : if (hashmap_contains(d->positive_by_key, &DNS_RESOURCE_KEY_CONST(DNS_CLASS_IN, DNS_TYPE_DS, name)))
584 : 0 : return false;
585 : :
586 [ # # ]: 0 : if (hashmap_contains(d->positive_by_key, &DNS_RESOURCE_KEY_CONST(DNS_CLASS_IN, DNS_TYPE_KEY, name)))
587 : 0 : return false;
588 : :
589 : : /* And now, let's look at the parent, and check that too */
590 : 0 : r = dns_name_parent(&name);
591 [ # # ]: 0 : if (r < 0)
592 : 0 : return r;
593 [ # # ]: 0 : if (r == 0)
594 : 0 : break;
595 : : }
596 : :
597 : 0 : return false;
598 : : }
599 : :
600 : 0 : static int dns_trust_anchor_revoked_put(DnsTrustAnchor *d, DnsResourceRecord *rr) {
601 : : int r;
602 : :
603 [ # # ]: 0 : assert(d);
604 : :
605 : 0 : r = set_ensure_allocated(&d->revoked_by_rr, &dns_resource_record_hash_ops);
606 [ # # ]: 0 : if (r < 0)
607 : 0 : return r;
608 : :
609 : 0 : r = set_put(d->revoked_by_rr, rr);
610 [ # # ]: 0 : if (r < 0)
611 : 0 : return r;
612 [ # # ]: 0 : if (r > 0)
613 : 0 : dns_resource_record_ref(rr);
614 : :
615 : 0 : return r;
616 : : }
617 : :
618 : 0 : static int dns_trust_anchor_remove_revoked(DnsTrustAnchor *d, DnsResourceRecord *rr) {
619 : 0 : _cleanup_(dns_answer_unrefp) DnsAnswer *new_answer = NULL;
620 : : DnsAnswer *old_answer;
621 : : int r;
622 : :
623 : : /* Remember that this is a revoked trust anchor RR */
624 : 0 : r = dns_trust_anchor_revoked_put(d, rr);
625 [ # # ]: 0 : if (r < 0)
626 : 0 : return r;
627 : :
628 : : /* Remove this from the positive trust anchor */
629 : 0 : old_answer = hashmap_get(d->positive_by_key, rr->key);
630 [ # # ]: 0 : if (!old_answer)
631 : 0 : return 0;
632 : :
633 : 0 : new_answer = dns_answer_ref(old_answer);
634 : :
635 : 0 : r = dns_answer_remove_by_rr(&new_answer, rr);
636 [ # # ]: 0 : if (r <= 0)
637 : 0 : return r;
638 : :
639 : : /* We found the key! Warn the user */
640 : 0 : log_struct(LOG_WARNING,
641 : : "MESSAGE_ID=" SD_MESSAGE_DNSSEC_TRUST_ANCHOR_REVOKED_STR,
642 : : LOG_MESSAGE("DNSSEC trust anchor %s has been revoked.\n"
643 : : "Please update the trust anchor, or upgrade your operating system.",
644 : : strna(dns_resource_record_to_string(rr))),
645 : : "TRUST_ANCHOR=%s", dns_resource_record_to_string(rr));
646 : :
647 [ # # ]: 0 : if (dns_answer_size(new_answer) <= 0) {
648 [ # # ]: 0 : assert_se(hashmap_remove(d->positive_by_key, rr->key) == old_answer);
649 : 0 : dns_answer_unref(old_answer);
650 : 0 : return 1;
651 : : }
652 : :
653 : 0 : r = hashmap_replace(d->positive_by_key, new_answer->items[0].rr->key, new_answer);
654 [ # # ]: 0 : if (r < 0)
655 : 0 : return r;
656 : :
657 : 0 : new_answer = NULL;
658 : 0 : dns_answer_unref(old_answer);
659 : 0 : return 1;
660 : : }
661 : :
662 : 0 : static int dns_trust_anchor_check_revoked_one(DnsTrustAnchor *d, DnsResourceRecord *revoked_dnskey) {
663 : : DnsAnswer *a;
664 : : int r;
665 : :
666 [ # # ]: 0 : assert(d);
667 [ # # ]: 0 : assert(revoked_dnskey);
668 [ # # ]: 0 : assert(revoked_dnskey->key->type == DNS_TYPE_DNSKEY);
669 [ # # ]: 0 : assert(revoked_dnskey->dnskey.flags & DNSKEY_FLAG_REVOKE);
670 : :
671 : 0 : a = hashmap_get(d->positive_by_key, revoked_dnskey->key);
672 [ # # ]: 0 : if (a) {
673 : : DnsResourceRecord *anchor;
674 : :
675 : : /* First, look for the precise DNSKEY in our trust anchor database */
676 : :
677 [ # # # # : 0 : DNS_ANSWER_FOREACH(anchor, a) {
# # # # #
# ]
678 : :
679 [ # # ]: 0 : if (anchor->dnskey.protocol != revoked_dnskey->dnskey.protocol)
680 : 0 : continue;
681 : :
682 [ # # ]: 0 : if (anchor->dnskey.algorithm != revoked_dnskey->dnskey.algorithm)
683 : 0 : continue;
684 : :
685 [ # # ]: 0 : if (anchor->dnskey.key_size != revoked_dnskey->dnskey.key_size)
686 : 0 : continue;
687 : :
688 : : /* Note that we allow the REVOKE bit to be
689 : : * different! It will be set in the revoked
690 : : * key, but unset in our version of it */
691 [ # # ]: 0 : if (((anchor->dnskey.flags ^ revoked_dnskey->dnskey.flags) | DNSKEY_FLAG_REVOKE) != DNSKEY_FLAG_REVOKE)
692 : 0 : continue;
693 : :
694 [ # # ]: 0 : if (memcmp(anchor->dnskey.key, revoked_dnskey->dnskey.key, anchor->dnskey.key_size) != 0)
695 : 0 : continue;
696 : :
697 : 0 : dns_trust_anchor_remove_revoked(d, anchor);
698 : 0 : break;
699 : : }
700 : : }
701 : :
702 : 0 : a = hashmap_get(d->positive_by_key, &DNS_RESOURCE_KEY_CONST(revoked_dnskey->key->class, DNS_TYPE_DS, dns_resource_key_name(revoked_dnskey->key)));
703 [ # # ]: 0 : if (a) {
704 : : DnsResourceRecord *anchor;
705 : :
706 : : /* Second, look for DS RRs matching this DNSKEY in our trust anchor database */
707 : :
708 [ # # # # : 0 : DNS_ANSWER_FOREACH(anchor, a) {
# # # # ]
709 : :
710 : : /* We set mask_revoke to true here, since our
711 : : * DS fingerprint will be the one of the
712 : : * unrevoked DNSKEY, but the one we got passed
713 : : * here has the bit set. */
714 : 0 : r = dnssec_verify_dnskey_by_ds(revoked_dnskey, anchor, true);
715 [ # # ]: 0 : if (r < 0)
716 : 0 : return r;
717 [ # # ]: 0 : if (r == 0)
718 [ # # ]: 0 : continue;
719 : :
720 : 0 : dns_trust_anchor_remove_revoked(d, anchor);
721 : 0 : break;
722 : : }
723 : : }
724 : :
725 : 0 : return 0;
726 : : }
727 : :
728 : 0 : int dns_trust_anchor_check_revoked(DnsTrustAnchor *d, DnsResourceRecord *dnskey, DnsAnswer *rrs) {
729 : : DnsResourceRecord *rrsig;
730 : : int r;
731 : :
732 [ # # ]: 0 : assert(d);
733 [ # # ]: 0 : assert(dnskey);
734 : :
735 : : /* Looks if "dnskey" is a self-signed RR that has been revoked
736 : : * and matches one of our trust anchor entries. If so, removes
737 : : * it from the trust anchor and returns > 0. */
738 : :
739 [ # # ]: 0 : if (dnskey->key->type != DNS_TYPE_DNSKEY)
740 : 0 : return 0;
741 : :
742 : : /* Is this DNSKEY revoked? */
743 [ # # ]: 0 : if ((dnskey->dnskey.flags & DNSKEY_FLAG_REVOKE) == 0)
744 : 0 : return 0;
745 : :
746 : : /* Could this be interesting to us at all? If not,
747 : : * there's no point in looking for and verifying a
748 : : * self-signed RRSIG. */
749 [ # # ]: 0 : if (!dns_trust_anchor_knows_domain_positive(d, dns_resource_key_name(dnskey->key)))
750 : 0 : return 0;
751 : :
752 : : /* Look for a self-signed RRSIG in the other rrs belonging to this DNSKEY */
753 [ # # # # : 0 : DNS_ANSWER_FOREACH(rrsig, rrs) {
# # # # ]
754 : : DnssecResult result;
755 : :
756 [ # # ]: 0 : if (rrsig->key->type != DNS_TYPE_RRSIG)
757 [ # # ]: 0 : continue;
758 : :
759 : 0 : r = dnssec_rrsig_match_dnskey(rrsig, dnskey, true);
760 [ # # ]: 0 : if (r < 0)
761 : 0 : return r;
762 [ # # ]: 0 : if (r == 0)
763 : 0 : continue;
764 : :
765 : 0 : r = dnssec_verify_rrset(rrs, dnskey->key, rrsig, dnskey, USEC_INFINITY, &result);
766 [ # # ]: 0 : if (r < 0)
767 : 0 : return r;
768 [ # # ]: 0 : if (result != DNSSEC_VALIDATED)
769 : 0 : continue;
770 : :
771 : : /* Bingo! This is a revoked self-signed DNSKEY. Let's
772 : : * see if this precise one exists in our trust anchor
773 : : * database, too. */
774 : 0 : r = dns_trust_anchor_check_revoked_one(d, dnskey);
775 [ # # ]: 0 : if (r < 0)
776 : 0 : return r;
777 : :
778 : 0 : return 1;
779 : : }
780 : :
781 : 0 : return 0;
782 : : }
783 : :
784 : 0 : int dns_trust_anchor_is_revoked(DnsTrustAnchor *d, DnsResourceRecord *rr) {
785 [ # # ]: 0 : assert(d);
786 : :
787 [ # # # # ]: 0 : if (!IN_SET(rr->key->type, DNS_TYPE_DS, DNS_TYPE_DNSKEY))
788 : 0 : return 0;
789 : :
790 : 0 : return set_contains(d->revoked_by_rr, rr);
791 : : }
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