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db9ecf05 | 1 | /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
0d2cd476 | 2 | |
62cc1c55 | 3 | #include "sd-messages.h" |
0c857028 | 4 | |
0d2cd476 | 5 | #include "alloc-util.h" |
8e54f5d9 | 6 | #include "conf-files.h" |
28db6fbf | 7 | #include "constants.h" |
8e54f5d9 LP |
8 | #include "dns-domain.h" |
9 | #include "fd-util.h" | |
10 | #include "fileio.h" | |
11 | #include "hexdecoct.h" | |
d8b4d14d | 12 | #include "nulstr-util.h" |
8e54f5d9 | 13 | #include "parse-util.h" |
0c857028 | 14 | #include "resolved-dns-dnssec.h" |
760877e9 | 15 | #include "resolved-dns-trust-anchor.h" |
8e54f5d9 | 16 | #include "set.h" |
760877e9 | 17 | #include "sort-util.h" |
8e54f5d9 LP |
18 | #include "string-util.h" |
19 | #include "strv.h" | |
0d2cd476 | 20 | |
e7d179ac | 21 | static const char trust_anchor_dirs[] = CONF_PATHS_NULSTR("dnssec-trust-anchors.d"); |
8e54f5d9 | 22 | |
3401f0e1 LP |
23 | /* The second DS RR from https://data.iana.org/root-anchors/root-anchors.xml, retrieved February 2017 */ |
24 | static const uint8_t root_digest2[] = | |
25 | { 0xE0, 0x6D, 0x44, 0xB8, 0x0B, 0x8F, 0x1D, 0x39, 0xA9, 0x5C, 0x0B, 0x0D, 0x7C, 0x65, 0xD0, 0x84, | |
26 | 0x58, 0xE8, 0x80, 0x40, 0x9B, 0xBC, 0x68, 0x34, 0x57, 0x10, 0x42, 0x37, 0xC7, 0xF8, 0xEC, 0x8D }; | |
27 | ||
86e9cbca LP |
28 | static bool dns_trust_anchor_knows_domain_positive(DnsTrustAnchor *d, const char *name) { |
29 | assert(d); | |
30 | ||
31 | /* Returns true if there's an entry for the specified domain | |
32 | * name in our trust anchor */ | |
33 | ||
34 | return | |
35 | hashmap_contains(d->positive_by_key, &DNS_RESOURCE_KEY_CONST(DNS_CLASS_IN, DNS_TYPE_DNSKEY, name)) || | |
36 | hashmap_contains(d->positive_by_key, &DNS_RESOURCE_KEY_CONST(DNS_CLASS_IN, DNS_TYPE_DS, name)); | |
37 | } | |
38 | ||
3401f0e1 LP |
39 | static int add_root_ksk( |
40 | DnsAnswer *answer, | |
41 | DnsResourceKey *key, | |
42 | uint16_t key_tag, | |
43 | uint8_t algorithm, | |
44 | uint8_t digest_type, | |
45 | const void *digest, | |
46 | size_t digest_size) { | |
47 | ||
0d2cd476 | 48 | _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *rr = NULL; |
3401f0e1 LP |
49 | int r; |
50 | ||
51 | rr = dns_resource_record_new(key); | |
52 | if (!rr) | |
53 | return -ENOMEM; | |
54 | ||
55 | rr->ds.key_tag = key_tag; | |
56 | rr->ds.algorithm = algorithm; | |
57 | rr->ds.digest_type = digest_type; | |
58 | rr->ds.digest_size = digest_size; | |
59 | rr->ds.digest = memdup(digest, rr->ds.digest_size); | |
60 | if (!rr->ds.digest) | |
61 | return -ENOMEM; | |
62 | ||
04617bf8 | 63 | r = dns_answer_add(answer, rr, 0, DNS_ANSWER_AUTHENTICATED, NULL); |
3401f0e1 LP |
64 | if (r < 0) |
65 | return r; | |
66 | ||
67 | return 0; | |
68 | } | |
69 | ||
70 | static int dns_trust_anchor_add_builtin_positive(DnsTrustAnchor *d) { | |
0d2cd476 | 71 | _cleanup_(dns_answer_unrefp) DnsAnswer *answer = NULL; |
3401f0e1 | 72 | _cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL; |
0d2cd476 LP |
73 | int r; |
74 | ||
75 | assert(d); | |
76 | ||
8e54f5d9 | 77 | r = hashmap_ensure_allocated(&d->positive_by_key, &dns_resource_key_hash_ops); |
0d2cd476 LP |
78 | if (r < 0) |
79 | return r; | |
80 | ||
3401f0e1 LP |
81 | /* Only add the built-in trust anchor if there's neither a DS nor a DNSKEY defined for the root domain. That |
82 | * way users have an easy way to override the root domain DS/DNSKEY data. */ | |
86e9cbca | 83 | if (dns_trust_anchor_knows_domain_positive(d, ".")) |
d76f90f1 LP |
84 | return 0; |
85 | ||
3401f0e1 LP |
86 | key = dns_resource_key_new(DNS_CLASS_IN, DNS_TYPE_DS, ""); |
87 | if (!key) | |
0d2cd476 LP |
88 | return -ENOMEM; |
89 | ||
3401f0e1 | 90 | answer = dns_answer_new(2); |
0d2cd476 LP |
91 | if (!answer) |
92 | return -ENOMEM; | |
93 | ||
f1f20764 | 94 | /* Add the currently valid RRs from https://data.iana.org/root-anchors/root-anchors.xml */ |
3401f0e1 | 95 | r = add_root_ksk(answer, key, 20326, DNSSEC_ALGORITHM_RSASHA256, DNSSEC_DIGEST_SHA256, root_digest2, sizeof(root_digest2)); |
0d2cd476 LP |
96 | if (r < 0) |
97 | return r; | |
98 | ||
3401f0e1 | 99 | r = hashmap_put(d->positive_by_key, key, answer); |
8e54f5d9 LP |
100 | if (r < 0) |
101 | return r; | |
102 | ||
103 | answer = NULL; | |
104 | return 0; | |
105 | } | |
106 | ||
30c77809 LP |
107 | static int dns_trust_anchor_add_builtin_negative(DnsTrustAnchor *d) { |
108 | ||
109 | static const char private_domains[] = | |
110 | /* RFC 6761 says that .test is a special domain for | |
111 | * testing and not to be installed in the root zone */ | |
112 | "test\0" | |
113 | ||
114 | /* RFC 6761 says that these reverse IP lookup ranges | |
115 | * are for private addresses, and hence should not | |
116 | * show up in the root zone */ | |
117 | "10.in-addr.arpa\0" | |
118 | "16.172.in-addr.arpa\0" | |
119 | "17.172.in-addr.arpa\0" | |
120 | "18.172.in-addr.arpa\0" | |
121 | "19.172.in-addr.arpa\0" | |
122 | "20.172.in-addr.arpa\0" | |
123 | "21.172.in-addr.arpa\0" | |
124 | "22.172.in-addr.arpa\0" | |
125 | "23.172.in-addr.arpa\0" | |
126 | "24.172.in-addr.arpa\0" | |
127 | "25.172.in-addr.arpa\0" | |
128 | "26.172.in-addr.arpa\0" | |
129 | "27.172.in-addr.arpa\0" | |
130 | "28.172.in-addr.arpa\0" | |
131 | "29.172.in-addr.arpa\0" | |
132 | "30.172.in-addr.arpa\0" | |
133 | "31.172.in-addr.arpa\0" | |
134 | "168.192.in-addr.arpa\0" | |
135 | ||
f07529fe LP |
136 | /* The same, but for IPv6. */ |
137 | "d.f.ip6.arpa\0" | |
138 | ||
30c77809 LP |
139 | /* RFC 6762 reserves the .local domain for Multicast |
140 | * DNS, it hence cannot appear in the root zone. (Note | |
141 | * that we by default do not route .local traffic to | |
142 | * DNS anyway, except when a configured search domain | |
143 | * suggests so.) */ | |
144 | "local\0" | |
145 | ||
146 | /* These two are well known, popular private zone | |
147 | * TLDs, that are blocked from delegation, according | |
148 | * to: | |
149 | * http://icannwiki.com/Name_Collision#NGPC_Resolution | |
150 | * | |
151 | * There's also ongoing work on making this official | |
152 | * in an RRC: | |
153 | * https://www.ietf.org/archive/id/draft-chapin-additional-reserved-tlds-02.txt */ | |
154 | "home\0" | |
155 | "corp\0" | |
156 | ||
157 | /* The following four TLDs are suggested for private | |
158 | * zones in RFC 6762, Appendix G, and are hence very | |
159 | * unlikely to be made official TLDs any day soon */ | |
160 | "lan\0" | |
161 | "intranet\0" | |
162 | "internal\0" | |
10655014 LP |
163 | "private\0" |
164 | ||
165 | /* Defined by RFC 8375. The most official choice. */ | |
7406ebd5 BJ |
166 | "home.arpa\0" |
167 | ||
168 | /* RFC 8880 says because the 'ipv4only.arpa' zone has to | |
169 | * be an insecure delegation, DNSSEC cannot be used to | |
170 | * protect these answers from tampering by malicious | |
171 | * devices on the path */ | |
172 | "ipv4only.arpa\0" | |
173 | "170.0.0.192.in-addr.arpa\0" | |
174 | "171.0.0.192.in-addr.arpa\0"; | |
30c77809 | 175 | |
30c77809 LP |
176 | int r; |
177 | ||
178 | assert(d); | |
179 | ||
180 | /* Only add the built-in trust anchor if there's no negative | |
181 | * trust anchor defined at all. This enables easy overriding | |
182 | * of negative trust anchors. */ | |
183 | ||
43127aeb | 184 | if (!set_isempty(d->negative_by_name)) |
30c77809 LP |
185 | return 0; |
186 | ||
187 | r = set_ensure_allocated(&d->negative_by_name, &dns_name_hash_ops); | |
188 | if (r < 0) | |
189 | return r; | |
190 | ||
191 | /* We add a couple of domains as default negative trust | |
192 | * anchors, where it's very unlikely they will be installed in | |
193 | * the root zone. If they exist they must be private, and thus | |
194 | * unsigned. */ | |
195 | ||
196 | NULSTR_FOREACH(name, private_domains) { | |
30c77809 LP |
197 | if (dns_trust_anchor_knows_domain_positive(d, name)) |
198 | continue; | |
199 | ||
be327321 | 200 | r = set_put_strdup(&d->negative_by_name, name); |
30c77809 LP |
201 | if (r < 0) |
202 | return r; | |
203 | } | |
204 | ||
205 | return 0; | |
206 | } | |
207 | ||
8e54f5d9 LP |
208 | static int dns_trust_anchor_load_positive(DnsTrustAnchor *d, const char *path, unsigned line, const char *s) { |
209 | _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *rr = NULL; | |
210 | _cleanup_free_ char *domain = NULL, *class = NULL, *type = NULL; | |
211 | _cleanup_(dns_answer_unrefp) DnsAnswer *answer = NULL; | |
212 | DnsAnswer *old_answer = NULL; | |
213 | const char *p = s; | |
214 | int r; | |
215 | ||
216 | assert(d); | |
217 | assert(line); | |
218 | ||
4ec85141 | 219 | r = extract_first_word(&p, &domain, NULL, EXTRACT_UNQUOTE); |
8e54f5d9 LP |
220 | if (r < 0) |
221 | return log_warning_errno(r, "Unable to parse domain in line %s:%u: %m", path, line); | |
222 | ||
10c6e7e5 YW |
223 | r = dns_name_is_valid(domain); |
224 | if (r < 0) | |
5238e957 | 225 | return log_warning_errno(r, "Failed to check validity of domain name '%s', at line %s:%u, ignoring line: %m", domain, path, line); |
10c6e7e5 | 226 | if (r == 0) { |
8e54f5d9 LP |
227 | log_warning("Domain name %s is invalid, at line %s:%u, ignoring line.", domain, path, line); |
228 | return -EINVAL; | |
229 | } | |
230 | ||
231 | r = extract_many_words(&p, NULL, 0, &class, &type, NULL); | |
232 | if (r < 0) | |
233 | return log_warning_errno(r, "Unable to parse class and type in line %s:%u: %m", path, line); | |
234 | if (r != 2) { | |
235 | log_warning("Missing class or type in line %s:%u", path, line); | |
236 | return -EINVAL; | |
237 | } | |
238 | ||
239 | if (!strcaseeq(class, "IN")) { | |
240 | log_warning("RR class %s is not supported, ignoring line %s:%u.", class, path, line); | |
241 | return -EINVAL; | |
242 | } | |
243 | ||
244 | if (strcaseeq(type, "DS")) { | |
509685f9 | 245 | _cleanup_free_ char *key_tag = NULL, *algorithm = NULL, *digest_type = NULL; |
8e54f5d9 LP |
246 | _cleanup_free_ void *dd = NULL; |
247 | uint16_t kt; | |
248 | int a, dt; | |
249 | size_t l; | |
250 | ||
509685f9 | 251 | r = extract_many_words(&p, NULL, 0, &key_tag, &algorithm, &digest_type, NULL); |
8e54f5d9 LP |
252 | if (r < 0) { |
253 | log_warning_errno(r, "Failed to parse DS parameters on line %s:%u: %m", path, line); | |
254 | return -EINVAL; | |
255 | } | |
509685f9 | 256 | if (r != 3) { |
8e54f5d9 LP |
257 | log_warning("Missing DS parameters on line %s:%u", path, line); |
258 | return -EINVAL; | |
259 | } | |
260 | ||
261 | r = safe_atou16(key_tag, &kt); | |
262 | if (r < 0) | |
263 | return log_warning_errno(r, "Failed to parse DS key tag %s on line %s:%u: %m", key_tag, path, line); | |
264 | ||
265 | a = dnssec_algorithm_from_string(algorithm); | |
266 | if (a < 0) { | |
267 | log_warning("Failed to parse DS algorithm %s on line %s:%u", algorithm, path, line); | |
268 | return -EINVAL; | |
269 | } | |
270 | ||
271 | dt = dnssec_digest_from_string(digest_type); | |
272 | if (dt < 0) { | |
273 | log_warning("Failed to parse DS digest type %s on line %s:%u", digest_type, path, line); | |
274 | return -EINVAL; | |
275 | } | |
276 | ||
509685f9 YW |
277 | if (isempty(p)) { |
278 | log_warning("Missing DS digest on line %s:%u", path, line); | |
279 | return -EINVAL; | |
280 | } | |
281 | ||
bdd2036e | 282 | r = unhexmem(p, &dd, &l); |
8e54f5d9 | 283 | if (r < 0) { |
509685f9 | 284 | log_warning("Failed to parse DS digest %s on line %s:%u", p, path, line); |
8e54f5d9 LP |
285 | return -EINVAL; |
286 | } | |
287 | ||
288 | rr = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_DS, domain); | |
289 | if (!rr) | |
290 | return log_oom(); | |
291 | ||
292 | rr->ds.key_tag = kt; | |
293 | rr->ds.algorithm = a; | |
294 | rr->ds.digest_type = dt; | |
295 | rr->ds.digest_size = l; | |
1cc6c93a | 296 | rr->ds.digest = TAKE_PTR(dd); |
8e54f5d9 LP |
297 | |
298 | } else if (strcaseeq(type, "DNSKEY")) { | |
509685f9 | 299 | _cleanup_free_ char *flags = NULL, *protocol = NULL, *algorithm = NULL; |
8e54f5d9 LP |
300 | _cleanup_free_ void *k = NULL; |
301 | uint16_t f; | |
302 | size_t l; | |
303 | int a; | |
304 | ||
509685f9 | 305 | r = extract_many_words(&p, NULL, 0, &flags, &protocol, &algorithm, NULL); |
8e54f5d9 LP |
306 | if (r < 0) |
307 | return log_warning_errno(r, "Failed to parse DNSKEY parameters on line %s:%u: %m", path, line); | |
509685f9 | 308 | if (r != 3) { |
8e54f5d9 LP |
309 | log_warning("Missing DNSKEY parameters on line %s:%u", path, line); |
310 | return -EINVAL; | |
311 | } | |
312 | ||
313 | if (!streq(protocol, "3")) { | |
314 | log_warning("DNSKEY Protocol is not 3 on line %s:%u", path, line); | |
315 | return -EINVAL; | |
316 | } | |
317 | ||
318 | r = safe_atou16(flags, &f); | |
319 | if (r < 0) | |
320 | return log_warning_errno(r, "Failed to parse DNSKEY flags field %s on line %s:%u", flags, path, line); | |
2a0d751b LP |
321 | if ((f & DNSKEY_FLAG_ZONE_KEY) == 0) { |
322 | log_warning("DNSKEY lacks zone key bit set on line %s:%u", path, line); | |
323 | return -EINVAL; | |
324 | } | |
325 | if ((f & DNSKEY_FLAG_REVOKE)) { | |
326 | log_warning("DNSKEY is already revoked on line %s:%u", path, line); | |
327 | return -EINVAL; | |
328 | } | |
8e54f5d9 LP |
329 | |
330 | a = dnssec_algorithm_from_string(algorithm); | |
331 | if (a < 0) { | |
332 | log_warning("Failed to parse DNSKEY algorithm %s on line %s:%u", algorithm, path, line); | |
333 | return -EINVAL; | |
334 | } | |
335 | ||
509685f9 YW |
336 | if (isempty(p)) { |
337 | log_warning("Missing DNSKEY key on line %s:%u", path, line); | |
338 | return -EINVAL; | |
339 | } | |
340 | ||
bdd2036e | 341 | r = unbase64mem(p, &k, &l); |
8e54f5d9 | 342 | if (r < 0) |
509685f9 | 343 | return log_warning_errno(r, "Failed to parse DNSKEY key data %s on line %s:%u", p, path, line); |
8e54f5d9 LP |
344 | |
345 | rr = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_DNSKEY, domain); | |
346 | if (!rr) | |
347 | return log_oom(); | |
348 | ||
349 | rr->dnskey.flags = f; | |
350 | rr->dnskey.protocol = 3; | |
351 | rr->dnskey.algorithm = a; | |
352 | rr->dnskey.key_size = l; | |
1cc6c93a | 353 | rr->dnskey.key = TAKE_PTR(k); |
8e54f5d9 LP |
354 | |
355 | } else { | |
356 | log_warning("RR type %s is not supported, ignoring line %s:%u.", type, path, line); | |
357 | return -EINVAL; | |
358 | } | |
359 | ||
8e54f5d9 | 360 | r = hashmap_ensure_allocated(&d->positive_by_key, &dns_resource_key_hash_ops); |
0d2cd476 | 361 | if (r < 0) |
b3331c39 | 362 | return log_oom(); |
0d2cd476 | 363 | |
8e54f5d9 LP |
364 | old_answer = hashmap_get(d->positive_by_key, rr->key); |
365 | answer = dns_answer_ref(old_answer); | |
366 | ||
04617bf8 | 367 | r = dns_answer_add_extend(&answer, rr, 0, DNS_ANSWER_AUTHENTICATED, NULL); |
8e54f5d9 LP |
368 | if (r < 0) |
369 | return log_error_errno(r, "Failed to add trust anchor RR: %m"); | |
370 | ||
371 | r = hashmap_replace(d->positive_by_key, rr->key, answer); | |
372 | if (r < 0) | |
373 | return log_error_errno(r, "Failed to add answer to trust anchor: %m"); | |
374 | ||
375 | old_answer = dns_answer_unref(old_answer); | |
0d2cd476 | 376 | answer = NULL; |
8e54f5d9 LP |
377 | |
378 | return 0; | |
379 | } | |
380 | ||
381 | static int dns_trust_anchor_load_negative(DnsTrustAnchor *d, const char *path, unsigned line, const char *s) { | |
382 | _cleanup_free_ char *domain = NULL; | |
383 | const char *p = s; | |
384 | int r; | |
385 | ||
386 | assert(d); | |
387 | assert(line); | |
388 | ||
4ec85141 | 389 | r = extract_first_word(&p, &domain, NULL, EXTRACT_UNQUOTE); |
8e54f5d9 LP |
390 | if (r < 0) |
391 | return log_warning_errno(r, "Unable to parse line %s:%u: %m", path, line); | |
392 | ||
10c6e7e5 YW |
393 | r = dns_name_is_valid(domain); |
394 | if (r < 0) | |
5238e957 | 395 | return log_warning_errno(r, "Failed to check validity of domain name '%s', at line %s:%u, ignoring line: %m", domain, path, line); |
10c6e7e5 | 396 | if (r == 0) { |
8e54f5d9 LP |
397 | log_warning("Domain name %s is invalid, at line %s:%u, ignoring line.", domain, path, line); |
398 | return -EINVAL; | |
399 | } | |
400 | ||
401 | if (!isempty(p)) { | |
402 | log_warning("Trailing garbage at line %s:%u, ignoring line.", path, line); | |
403 | return -EINVAL; | |
404 | } | |
405 | ||
35e601d4 | 406 | r = set_ensure_consume(&d->negative_by_name, &dns_name_hash_ops, TAKE_PTR(domain)); |
8e54f5d9 LP |
407 | if (r < 0) |
408 | return log_oom(); | |
8e54f5d9 LP |
409 | |
410 | return 0; | |
411 | } | |
412 | ||
413 | static int dns_trust_anchor_load_files( | |
414 | DnsTrustAnchor *d, | |
415 | const char *suffix, | |
416 | int (*loader)(DnsTrustAnchor *d, const char *path, unsigned n, const char *line)) { | |
417 | ||
418 | _cleanup_strv_free_ char **files = NULL; | |
8e54f5d9 LP |
419 | int r; |
420 | ||
421 | assert(d); | |
422 | assert(suffix); | |
423 | assert(loader); | |
424 | ||
b5084605 | 425 | r = conf_files_list_nulstr(&files, suffix, NULL, 0, trust_anchor_dirs); |
8e54f5d9 LP |
426 | if (r < 0) |
427 | return log_error_errno(r, "Failed to enumerate %s trust anchor files: %m", suffix); | |
428 | ||
429 | STRV_FOREACH(f, files) { | |
430 | _cleanup_fclose_ FILE *g = NULL; | |
8e54f5d9 LP |
431 | unsigned n = 0; |
432 | ||
a3ee0916 | 433 | g = fopen(*f, "re"); |
8e54f5d9 LP |
434 | if (!g) { |
435 | if (errno == ENOENT) | |
436 | continue; | |
437 | ||
0a6488b4 | 438 | log_warning_errno(errno, "Failed to open '%s', ignoring: %m", *f); |
8e54f5d9 LP |
439 | continue; |
440 | } | |
441 | ||
0a6488b4 LP |
442 | for (;;) { |
443 | _cleanup_free_ char *line = NULL; | |
8e54f5d9 | 444 | |
0ff6ff2b | 445 | r = read_stripped_line(g, LONG_LINE_MAX, &line); |
0a6488b4 LP |
446 | if (r < 0) { |
447 | log_warning_errno(r, "Failed to read '%s', ignoring: %m", *f); | |
448 | break; | |
449 | } | |
450 | if (r == 0) | |
451 | break; | |
452 | ||
8e54f5d9 LP |
453 | n++; |
454 | ||
0ff6ff2b | 455 | if (isempty(line)) |
8e54f5d9 LP |
456 | continue; |
457 | ||
0ff6ff2b | 458 | if (*line == ';') |
8e54f5d9 LP |
459 | continue; |
460 | ||
0ff6ff2b | 461 | (void) loader(d, *f, n, line); |
8e54f5d9 LP |
462 | } |
463 | } | |
464 | ||
465 | return 0; | |
466 | } | |
467 | ||
93bab288 YW |
468 | static int domain_name_cmp(char * const *a, char * const *b) { |
469 | return dns_name_compare_func(*a, *b); | |
bec69050 LP |
470 | } |
471 | ||
472 | static int dns_trust_anchor_dump(DnsTrustAnchor *d) { | |
8e54f5d9 | 473 | DnsAnswer *a; |
8e54f5d9 LP |
474 | |
475 | assert(d); | |
476 | ||
105f6c4b LP |
477 | if (hashmap_isempty(d->positive_by_key)) |
478 | log_info("No positive trust anchors defined."); | |
479 | else { | |
480 | log_info("Positive Trust Anchors:"); | |
90e74a66 | 481 | HASHMAP_FOREACH(a, d->positive_by_key) { |
105f6c4b LP |
482 | DnsResourceRecord *rr; |
483 | ||
484 | DNS_ANSWER_FOREACH(rr, a) | |
485 | log_info("%s", dns_resource_record_to_string(rr)); | |
486 | } | |
8e54f5d9 LP |
487 | } |
488 | ||
105f6c4b LP |
489 | if (set_isempty(d->negative_by_name)) |
490 | log_info("No negative trust anchors defined."); | |
491 | else { | |
bec69050 LP |
492 | _cleanup_free_ char **l = NULL, *j = NULL; |
493 | ||
494 | l = set_get_strv(d->negative_by_name); | |
495 | if (!l) | |
496 | return log_oom(); | |
8e54f5d9 | 497 | |
93bab288 | 498 | typesafe_qsort(l, set_size(d->negative_by_name), domain_name_cmp); |
bec69050 LP |
499 | |
500 | j = strv_join(l, " "); | |
501 | if (!j) | |
502 | return log_oom(); | |
503 | ||
504 | log_info("Negative trust anchors: %s", j); | |
8e54f5d9 | 505 | } |
bec69050 LP |
506 | |
507 | return 0; | |
8e54f5d9 LP |
508 | } |
509 | ||
510 | int dns_trust_anchor_load(DnsTrustAnchor *d) { | |
511 | int r; | |
512 | ||
513 | assert(d); | |
514 | ||
515 | /* If loading things from disk fails, we don't consider this fatal */ | |
516 | (void) dns_trust_anchor_load_files(d, ".positive", dns_trust_anchor_load_positive); | |
517 | (void) dns_trust_anchor_load_files(d, ".negative", dns_trust_anchor_load_negative); | |
518 | ||
519 | /* However, if the built-in DS fails, then we have a problem. */ | |
30c77809 LP |
520 | r = dns_trust_anchor_add_builtin_positive(d); |
521 | if (r < 0) | |
522 | return log_error_errno(r, "Failed to add built-in positive trust anchor: %m"); | |
523 | ||
524 | r = dns_trust_anchor_add_builtin_negative(d); | |
8e54f5d9 | 525 | if (r < 0) |
30c77809 | 526 | return log_error_errno(r, "Failed to add built-in negative trust anchor: %m"); |
8e54f5d9 LP |
527 | |
528 | dns_trust_anchor_dump(d); | |
529 | ||
0d2cd476 LP |
530 | return 0; |
531 | } | |
532 | ||
533 | void dns_trust_anchor_flush(DnsTrustAnchor *d) { | |
0d2cd476 LP |
534 | assert(d); |
535 | ||
224b0e7a ZJS |
536 | d->positive_by_key = hashmap_free_with_destructor(d->positive_by_key, dns_answer_unref); |
537 | d->revoked_by_rr = set_free_with_destructor(d->revoked_by_rr, dns_resource_record_unref); | |
8e54f5d9 | 538 | d->negative_by_name = set_free_free(d->negative_by_name); |
0d2cd476 LP |
539 | } |
540 | ||
8e54f5d9 | 541 | int dns_trust_anchor_lookup_positive(DnsTrustAnchor *d, const DnsResourceKey *key, DnsAnswer **ret) { |
0d2cd476 LP |
542 | DnsAnswer *a; |
543 | ||
544 | assert(d); | |
545 | assert(key); | |
546 | assert(ret); | |
547 | ||
548 | /* We only serve DS and DNSKEY RRs. */ | |
549 | if (!IN_SET(key->type, DNS_TYPE_DS, DNS_TYPE_DNSKEY)) | |
550 | return 0; | |
551 | ||
8e54f5d9 | 552 | a = hashmap_get(d->positive_by_key, key); |
0d2cd476 LP |
553 | if (!a) |
554 | return 0; | |
555 | ||
556 | *ret = dns_answer_ref(a); | |
557 | return 1; | |
558 | } | |
8e54f5d9 LP |
559 | |
560 | int dns_trust_anchor_lookup_negative(DnsTrustAnchor *d, const char *name) { | |
c775838a LP |
561 | int r; |
562 | ||
8e54f5d9 LP |
563 | assert(d); |
564 | assert(name); | |
565 | ||
c775838a LP |
566 | for (;;) { |
567 | /* If the domain is listed as-is in the NTA database, then that counts */ | |
568 | if (set_contains(d->negative_by_name, name)) | |
569 | return true; | |
570 | ||
571 | /* If the domain isn't listed as NTA, but is listed as positive trust anchor, then that counts. See RFC | |
572 | * 7646, section 1.1 */ | |
573 | if (hashmap_contains(d->positive_by_key, &DNS_RESOURCE_KEY_CONST(DNS_CLASS_IN, DNS_TYPE_DS, name))) | |
574 | return false; | |
575 | ||
576 | if (hashmap_contains(d->positive_by_key, &DNS_RESOURCE_KEY_CONST(DNS_CLASS_IN, DNS_TYPE_KEY, name))) | |
577 | return false; | |
578 | ||
579 | /* And now, let's look at the parent, and check that too */ | |
580 | r = dns_name_parent(&name); | |
581 | if (r < 0) | |
582 | return r; | |
583 | if (r == 0) | |
584 | break; | |
585 | } | |
586 | ||
587 | return false; | |
8e54f5d9 | 588 | } |
0c857028 | 589 | |
c9c72065 LP |
590 | static int dns_trust_anchor_revoked_put(DnsTrustAnchor *d, DnsResourceRecord *rr) { |
591 | int r; | |
592 | ||
593 | assert(d); | |
594 | ||
de7fef4b | 595 | r = set_ensure_put(&d->revoked_by_rr, &dns_resource_record_hash_ops, rr); |
c9c72065 LP |
596 | if (r < 0) |
597 | return r; | |
598 | if (r > 0) | |
599 | dns_resource_record_ref(rr); | |
600 | ||
601 | return r; | |
602 | } | |
603 | ||
0c857028 LP |
604 | static int dns_trust_anchor_remove_revoked(DnsTrustAnchor *d, DnsResourceRecord *rr) { |
605 | _cleanup_(dns_answer_unrefp) DnsAnswer *new_answer = NULL; | |
606 | DnsAnswer *old_answer; | |
71aee23d | 607 | DnsAnswerItem *item; |
0c857028 LP |
608 | int r; |
609 | ||
c9c72065 LP |
610 | /* Remember that this is a revoked trust anchor RR */ |
611 | r = dns_trust_anchor_revoked_put(d, rr); | |
612 | if (r < 0) | |
613 | return r; | |
614 | ||
615 | /* Remove this from the positive trust anchor */ | |
0c857028 LP |
616 | old_answer = hashmap_get(d->positive_by_key, rr->key); |
617 | if (!old_answer) | |
618 | return 0; | |
619 | ||
620 | new_answer = dns_answer_ref(old_answer); | |
621 | ||
622 | r = dns_answer_remove_by_rr(&new_answer, rr); | |
623 | if (r <= 0) | |
624 | return r; | |
625 | ||
626 | /* We found the key! Warn the user */ | |
627 | log_struct(LOG_WARNING, | |
2b044526 | 628 | "MESSAGE_ID=" SD_MESSAGE_DNSSEC_TRUST_ANCHOR_REVOKED_STR, |
2cda08fd ZJS |
629 | LOG_MESSAGE("DNSSEC trust anchor %s has been revoked.\n" |
630 | "Please update the trust anchor, or upgrade your operating system.", | |
631 | strna(dns_resource_record_to_string(rr))), | |
a1230ff9 | 632 | "TRUST_ANCHOR=%s", dns_resource_record_to_string(rr)); |
0c857028 LP |
633 | |
634 | if (dns_answer_size(new_answer) <= 0) { | |
635 | assert_se(hashmap_remove(d->positive_by_key, rr->key) == old_answer); | |
636 | dns_answer_unref(old_answer); | |
637 | return 1; | |
638 | } | |
639 | ||
71aee23d YW |
640 | item = ordered_set_first(new_answer->items); |
641 | r = hashmap_replace(d->positive_by_key, item->rr->key, new_answer); | |
0c857028 LP |
642 | if (r < 0) |
643 | return r; | |
644 | ||
71aee23d | 645 | TAKE_PTR(new_answer); |
0c857028 LP |
646 | dns_answer_unref(old_answer); |
647 | return 1; | |
648 | } | |
649 | ||
650 | static int dns_trust_anchor_check_revoked_one(DnsTrustAnchor *d, DnsResourceRecord *revoked_dnskey) { | |
651 | DnsAnswer *a; | |
652 | int r; | |
653 | ||
654 | assert(d); | |
655 | assert(revoked_dnskey); | |
656 | assert(revoked_dnskey->key->type == DNS_TYPE_DNSKEY); | |
657 | assert(revoked_dnskey->dnskey.flags & DNSKEY_FLAG_REVOKE); | |
658 | ||
659 | a = hashmap_get(d->positive_by_key, revoked_dnskey->key); | |
660 | if (a) { | |
661 | DnsResourceRecord *anchor; | |
662 | ||
663 | /* First, look for the precise DNSKEY in our trust anchor database */ | |
664 | ||
665 | DNS_ANSWER_FOREACH(anchor, a) { | |
666 | ||
667 | if (anchor->dnskey.protocol != revoked_dnskey->dnskey.protocol) | |
668 | continue; | |
669 | ||
670 | if (anchor->dnskey.algorithm != revoked_dnskey->dnskey.algorithm) | |
671 | continue; | |
672 | ||
673 | if (anchor->dnskey.key_size != revoked_dnskey->dnskey.key_size) | |
674 | continue; | |
675 | ||
c9c72065 LP |
676 | /* Note that we allow the REVOKE bit to be |
677 | * different! It will be set in the revoked | |
678 | * key, but unset in our version of it */ | |
0c857028 LP |
679 | if (((anchor->dnskey.flags ^ revoked_dnskey->dnskey.flags) | DNSKEY_FLAG_REVOKE) != DNSKEY_FLAG_REVOKE) |
680 | continue; | |
681 | ||
682 | if (memcmp(anchor->dnskey.key, revoked_dnskey->dnskey.key, anchor->dnskey.key_size) != 0) | |
683 | continue; | |
684 | ||
685 | dns_trust_anchor_remove_revoked(d, anchor); | |
686 | break; | |
687 | } | |
688 | } | |
689 | ||
1c02e7ba | 690 | 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))); |
0c857028 LP |
691 | if (a) { |
692 | DnsResourceRecord *anchor; | |
693 | ||
694 | /* Second, look for DS RRs matching this DNSKEY in our trust anchor database */ | |
695 | ||
696 | DNS_ANSWER_FOREACH(anchor, a) { | |
697 | ||
c9c72065 LP |
698 | /* We set mask_revoke to true here, since our |
699 | * DS fingerprint will be the one of the | |
700 | * unrevoked DNSKEY, but the one we got passed | |
701 | * here has the bit set. */ | |
96bb7673 | 702 | r = dnssec_verify_dnskey_by_ds(revoked_dnskey, anchor, true); |
0c857028 LP |
703 | if (r < 0) |
704 | return r; | |
705 | if (r == 0) | |
706 | continue; | |
707 | ||
708 | dns_trust_anchor_remove_revoked(d, anchor); | |
709 | break; | |
710 | } | |
711 | } | |
712 | ||
713 | return 0; | |
714 | } | |
715 | ||
d424da2a LP |
716 | int dns_trust_anchor_check_revoked(DnsTrustAnchor *d, DnsResourceRecord *dnskey, DnsAnswer *rrs) { |
717 | DnsResourceRecord *rrsig; | |
0c857028 LP |
718 | int r; |
719 | ||
720 | assert(d); | |
d424da2a LP |
721 | assert(dnskey); |
722 | ||
723 | /* Looks if "dnskey" is a self-signed RR that has been revoked | |
724 | * and matches one of our trust anchor entries. If so, removes | |
725 | * it from the trust anchor and returns > 0. */ | |
0c857028 | 726 | |
d424da2a LP |
727 | if (dnskey->key->type != DNS_TYPE_DNSKEY) |
728 | return 0; | |
0c857028 | 729 | |
d424da2a LP |
730 | /* Is this DNSKEY revoked? */ |
731 | if ((dnskey->dnskey.flags & DNSKEY_FLAG_REVOKE) == 0) | |
0c857028 LP |
732 | return 0; |
733 | ||
d424da2a LP |
734 | /* Could this be interesting to us at all? If not, |
735 | * there's no point in looking for and verifying a | |
736 | * self-signed RRSIG. */ | |
1c02e7ba | 737 | if (!dns_trust_anchor_knows_domain_positive(d, dns_resource_key_name(dnskey->key))) |
d424da2a LP |
738 | return 0; |
739 | ||
740 | /* Look for a self-signed RRSIG in the other rrs belonging to this DNSKEY */ | |
741 | DNS_ANSWER_FOREACH(rrsig, rrs) { | |
0c857028 LP |
742 | DnssecResult result; |
743 | ||
d424da2a LP |
744 | if (rrsig->key->type != DNS_TYPE_RRSIG) |
745 | continue; | |
746 | ||
747 | r = dnssec_rrsig_match_dnskey(rrsig, dnskey, true); | |
0c857028 LP |
748 | if (r < 0) |
749 | return r; | |
750 | if (r == 0) | |
751 | continue; | |
752 | ||
d424da2a LP |
753 | r = dnssec_verify_rrset(rrs, dnskey->key, rrsig, dnskey, USEC_INFINITY, &result); |
754 | if (r < 0) | |
755 | return r; | |
756 | if (result != DNSSEC_VALIDATED) | |
0c857028 LP |
757 | continue; |
758 | ||
d424da2a LP |
759 | /* Bingo! This is a revoked self-signed DNSKEY. Let's |
760 | * see if this precise one exists in our trust anchor | |
761 | * database, too. */ | |
762 | r = dns_trust_anchor_check_revoked_one(d, dnskey); | |
763 | if (r < 0) | |
764 | return r; | |
0c857028 | 765 | |
d424da2a | 766 | return 1; |
0c857028 LP |
767 | } |
768 | ||
769 | return 0; | |
770 | } | |
c9c72065 LP |
771 | |
772 | int dns_trust_anchor_is_revoked(DnsTrustAnchor *d, DnsResourceRecord *rr) { | |
773 | assert(d); | |
774 | ||
775 | if (!IN_SET(rr->key->type, DNS_TYPE_DS, DNS_TYPE_DNSKEY)) | |
776 | return 0; | |
777 | ||
778 | return set_contains(d->revoked_by_rr, rr); | |
779 | } |