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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
0d2cd476 | 2 | |
62cc1c55 | 3 | #include "sd-messages.h" |
0c857028 | 4 | |
0d2cd476 | 5 | #include "alloc-util.h" |
8e54f5d9 LP |
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" | |
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 | ||
63 | r = dns_answer_add(answer, rr, 0, DNS_ANSWER_AUTHENTICATED); | |
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" | |
163 | "private\0"; | |
164 | ||
165 | const char *name; | |
166 | int r; | |
167 | ||
168 | assert(d); | |
169 | ||
170 | /* Only add the built-in trust anchor if there's no negative | |
171 | * trust anchor defined at all. This enables easy overriding | |
172 | * of negative trust anchors. */ | |
173 | ||
174 | if (set_size(d->negative_by_name) > 0) | |
175 | return 0; | |
176 | ||
177 | r = set_ensure_allocated(&d->negative_by_name, &dns_name_hash_ops); | |
178 | if (r < 0) | |
179 | return r; | |
180 | ||
181 | /* We add a couple of domains as default negative trust | |
182 | * anchors, where it's very unlikely they will be installed in | |
183 | * the root zone. If they exist they must be private, and thus | |
184 | * unsigned. */ | |
185 | ||
186 | NULSTR_FOREACH(name, private_domains) { | |
30c77809 LP |
187 | if (dns_trust_anchor_knows_domain_positive(d, name)) |
188 | continue; | |
189 | ||
be327321 | 190 | r = set_put_strdup(&d->negative_by_name, name); |
30c77809 LP |
191 | if (r < 0) |
192 | return r; | |
193 | } | |
194 | ||
195 | return 0; | |
196 | } | |
197 | ||
8e54f5d9 LP |
198 | static int dns_trust_anchor_load_positive(DnsTrustAnchor *d, const char *path, unsigned line, const char *s) { |
199 | _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *rr = NULL; | |
200 | _cleanup_free_ char *domain = NULL, *class = NULL, *type = NULL; | |
201 | _cleanup_(dns_answer_unrefp) DnsAnswer *answer = NULL; | |
202 | DnsAnswer *old_answer = NULL; | |
203 | const char *p = s; | |
204 | int r; | |
205 | ||
206 | assert(d); | |
207 | assert(line); | |
208 | ||
4ec85141 | 209 | r = extract_first_word(&p, &domain, NULL, EXTRACT_UNQUOTE); |
8e54f5d9 LP |
210 | if (r < 0) |
211 | return log_warning_errno(r, "Unable to parse domain in line %s:%u: %m", path, line); | |
212 | ||
10c6e7e5 YW |
213 | r = dns_name_is_valid(domain); |
214 | if (r < 0) | |
5238e957 | 215 | return log_warning_errno(r, "Failed to check validity of domain name '%s', at line %s:%u, ignoring line: %m", domain, path, line); |
10c6e7e5 | 216 | if (r == 0) { |
8e54f5d9 LP |
217 | log_warning("Domain name %s is invalid, at line %s:%u, ignoring line.", domain, path, line); |
218 | return -EINVAL; | |
219 | } | |
220 | ||
221 | r = extract_many_words(&p, NULL, 0, &class, &type, NULL); | |
222 | if (r < 0) | |
223 | return log_warning_errno(r, "Unable to parse class and type in line %s:%u: %m", path, line); | |
224 | if (r != 2) { | |
225 | log_warning("Missing class or type in line %s:%u", path, line); | |
226 | return -EINVAL; | |
227 | } | |
228 | ||
229 | if (!strcaseeq(class, "IN")) { | |
230 | log_warning("RR class %s is not supported, ignoring line %s:%u.", class, path, line); | |
231 | return -EINVAL; | |
232 | } | |
233 | ||
234 | if (strcaseeq(type, "DS")) { | |
509685f9 | 235 | _cleanup_free_ char *key_tag = NULL, *algorithm = NULL, *digest_type = NULL; |
8e54f5d9 LP |
236 | _cleanup_free_ void *dd = NULL; |
237 | uint16_t kt; | |
238 | int a, dt; | |
239 | size_t l; | |
240 | ||
509685f9 | 241 | r = extract_many_words(&p, NULL, 0, &key_tag, &algorithm, &digest_type, NULL); |
8e54f5d9 LP |
242 | if (r < 0) { |
243 | log_warning_errno(r, "Failed to parse DS parameters on line %s:%u: %m", path, line); | |
244 | return -EINVAL; | |
245 | } | |
509685f9 | 246 | if (r != 3) { |
8e54f5d9 LP |
247 | log_warning("Missing DS parameters on line %s:%u", path, line); |
248 | return -EINVAL; | |
249 | } | |
250 | ||
251 | r = safe_atou16(key_tag, &kt); | |
252 | if (r < 0) | |
253 | return log_warning_errno(r, "Failed to parse DS key tag %s on line %s:%u: %m", key_tag, path, line); | |
254 | ||
255 | a = dnssec_algorithm_from_string(algorithm); | |
256 | if (a < 0) { | |
257 | log_warning("Failed to parse DS algorithm %s on line %s:%u", algorithm, path, line); | |
258 | return -EINVAL; | |
259 | } | |
260 | ||
261 | dt = dnssec_digest_from_string(digest_type); | |
262 | if (dt < 0) { | |
263 | log_warning("Failed to parse DS digest type %s on line %s:%u", digest_type, path, line); | |
264 | return -EINVAL; | |
265 | } | |
266 | ||
509685f9 YW |
267 | if (isempty(p)) { |
268 | log_warning("Missing DS digest on line %s:%u", path, line); | |
269 | return -EINVAL; | |
270 | } | |
271 | ||
272 | r = unhexmem(p, strlen(p), &dd, &l); | |
8e54f5d9 | 273 | if (r < 0) { |
509685f9 | 274 | log_warning("Failed to parse DS digest %s on line %s:%u", p, path, line); |
8e54f5d9 LP |
275 | return -EINVAL; |
276 | } | |
277 | ||
278 | rr = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_DS, domain); | |
279 | if (!rr) | |
280 | return log_oom(); | |
281 | ||
282 | rr->ds.key_tag = kt; | |
283 | rr->ds.algorithm = a; | |
284 | rr->ds.digest_type = dt; | |
285 | rr->ds.digest_size = l; | |
1cc6c93a | 286 | rr->ds.digest = TAKE_PTR(dd); |
8e54f5d9 LP |
287 | |
288 | } else if (strcaseeq(type, "DNSKEY")) { | |
509685f9 | 289 | _cleanup_free_ char *flags = NULL, *protocol = NULL, *algorithm = NULL; |
8e54f5d9 LP |
290 | _cleanup_free_ void *k = NULL; |
291 | uint16_t f; | |
292 | size_t l; | |
293 | int a; | |
294 | ||
509685f9 | 295 | r = extract_many_words(&p, NULL, 0, &flags, &protocol, &algorithm, NULL); |
8e54f5d9 LP |
296 | if (r < 0) |
297 | return log_warning_errno(r, "Failed to parse DNSKEY parameters on line %s:%u: %m", path, line); | |
509685f9 | 298 | if (r != 3) { |
8e54f5d9 LP |
299 | log_warning("Missing DNSKEY parameters on line %s:%u", path, line); |
300 | return -EINVAL; | |
301 | } | |
302 | ||
303 | if (!streq(protocol, "3")) { | |
304 | log_warning("DNSKEY Protocol is not 3 on line %s:%u", path, line); | |
305 | return -EINVAL; | |
306 | } | |
307 | ||
308 | r = safe_atou16(flags, &f); | |
309 | if (r < 0) | |
310 | return log_warning_errno(r, "Failed to parse DNSKEY flags field %s on line %s:%u", flags, path, line); | |
2a0d751b LP |
311 | if ((f & DNSKEY_FLAG_ZONE_KEY) == 0) { |
312 | log_warning("DNSKEY lacks zone key bit set on line %s:%u", path, line); | |
313 | return -EINVAL; | |
314 | } | |
315 | if ((f & DNSKEY_FLAG_REVOKE)) { | |
316 | log_warning("DNSKEY is already revoked on line %s:%u", path, line); | |
317 | return -EINVAL; | |
318 | } | |
8e54f5d9 LP |
319 | |
320 | a = dnssec_algorithm_from_string(algorithm); | |
321 | if (a < 0) { | |
322 | log_warning("Failed to parse DNSKEY algorithm %s on line %s:%u", algorithm, path, line); | |
323 | return -EINVAL; | |
324 | } | |
325 | ||
509685f9 YW |
326 | if (isempty(p)) { |
327 | log_warning("Missing DNSKEY key on line %s:%u", path, line); | |
328 | return -EINVAL; | |
329 | } | |
330 | ||
331 | r = unbase64mem(p, strlen(p), &k, &l); | |
8e54f5d9 | 332 | if (r < 0) |
509685f9 | 333 | return log_warning_errno(r, "Failed to parse DNSKEY key data %s on line %s:%u", p, path, line); |
8e54f5d9 LP |
334 | |
335 | rr = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_DNSKEY, domain); | |
336 | if (!rr) | |
337 | return log_oom(); | |
338 | ||
339 | rr->dnskey.flags = f; | |
340 | rr->dnskey.protocol = 3; | |
341 | rr->dnskey.algorithm = a; | |
342 | rr->dnskey.key_size = l; | |
1cc6c93a | 343 | rr->dnskey.key = TAKE_PTR(k); |
8e54f5d9 LP |
344 | |
345 | } else { | |
346 | log_warning("RR type %s is not supported, ignoring line %s:%u.", type, path, line); | |
347 | return -EINVAL; | |
348 | } | |
349 | ||
8e54f5d9 | 350 | r = hashmap_ensure_allocated(&d->positive_by_key, &dns_resource_key_hash_ops); |
0d2cd476 | 351 | if (r < 0) |
b3331c39 | 352 | return log_oom(); |
0d2cd476 | 353 | |
8e54f5d9 LP |
354 | old_answer = hashmap_get(d->positive_by_key, rr->key); |
355 | answer = dns_answer_ref(old_answer); | |
356 | ||
357 | r = dns_answer_add_extend(&answer, rr, 0, DNS_ANSWER_AUTHENTICATED); | |
358 | if (r < 0) | |
359 | return log_error_errno(r, "Failed to add trust anchor RR: %m"); | |
360 | ||
361 | r = hashmap_replace(d->positive_by_key, rr->key, answer); | |
362 | if (r < 0) | |
363 | return log_error_errno(r, "Failed to add answer to trust anchor: %m"); | |
364 | ||
365 | old_answer = dns_answer_unref(old_answer); | |
0d2cd476 | 366 | answer = NULL; |
8e54f5d9 LP |
367 | |
368 | return 0; | |
369 | } | |
370 | ||
371 | static int dns_trust_anchor_load_negative(DnsTrustAnchor *d, const char *path, unsigned line, const char *s) { | |
372 | _cleanup_free_ char *domain = NULL; | |
373 | const char *p = s; | |
374 | int r; | |
375 | ||
376 | assert(d); | |
377 | assert(line); | |
378 | ||
4ec85141 | 379 | r = extract_first_word(&p, &domain, NULL, EXTRACT_UNQUOTE); |
8e54f5d9 LP |
380 | if (r < 0) |
381 | return log_warning_errno(r, "Unable to parse line %s:%u: %m", path, line); | |
382 | ||
10c6e7e5 YW |
383 | r = dns_name_is_valid(domain); |
384 | if (r < 0) | |
5238e957 | 385 | return log_warning_errno(r, "Failed to check validity of domain name '%s', at line %s:%u, ignoring line: %m", domain, path, line); |
10c6e7e5 | 386 | if (r == 0) { |
8e54f5d9 LP |
387 | log_warning("Domain name %s is invalid, at line %s:%u, ignoring line.", domain, path, line); |
388 | return -EINVAL; | |
389 | } | |
390 | ||
391 | if (!isempty(p)) { | |
392 | log_warning("Trailing garbage at line %s:%u, ignoring line.", path, line); | |
393 | return -EINVAL; | |
394 | } | |
395 | ||
35e601d4 | 396 | r = set_ensure_consume(&d->negative_by_name, &dns_name_hash_ops, TAKE_PTR(domain)); |
8e54f5d9 LP |
397 | if (r < 0) |
398 | return log_oom(); | |
8e54f5d9 LP |
399 | |
400 | return 0; | |
401 | } | |
402 | ||
403 | static int dns_trust_anchor_load_files( | |
404 | DnsTrustAnchor *d, | |
405 | const char *suffix, | |
406 | int (*loader)(DnsTrustAnchor *d, const char *path, unsigned n, const char *line)) { | |
407 | ||
408 | _cleanup_strv_free_ char **files = NULL; | |
409 | char **f; | |
410 | int r; | |
411 | ||
412 | assert(d); | |
413 | assert(suffix); | |
414 | assert(loader); | |
415 | ||
b5084605 | 416 | r = conf_files_list_nulstr(&files, suffix, NULL, 0, trust_anchor_dirs); |
8e54f5d9 LP |
417 | if (r < 0) |
418 | return log_error_errno(r, "Failed to enumerate %s trust anchor files: %m", suffix); | |
419 | ||
420 | STRV_FOREACH(f, files) { | |
421 | _cleanup_fclose_ FILE *g = NULL; | |
8e54f5d9 LP |
422 | unsigned n = 0; |
423 | ||
424 | g = fopen(*f, "r"); | |
425 | if (!g) { | |
426 | if (errno == ENOENT) | |
427 | continue; | |
428 | ||
0a6488b4 | 429 | log_warning_errno(errno, "Failed to open '%s', ignoring: %m", *f); |
8e54f5d9 LP |
430 | continue; |
431 | } | |
432 | ||
0a6488b4 LP |
433 | for (;;) { |
434 | _cleanup_free_ char *line = NULL; | |
8e54f5d9 LP |
435 | char *l; |
436 | ||
0a6488b4 LP |
437 | r = read_line(g, LONG_LINE_MAX, &line); |
438 | if (r < 0) { | |
439 | log_warning_errno(r, "Failed to read '%s', ignoring: %m", *f); | |
440 | break; | |
441 | } | |
442 | if (r == 0) | |
443 | break; | |
444 | ||
8e54f5d9 LP |
445 | n++; |
446 | ||
447 | l = strstrip(line); | |
448 | if (isempty(l)) | |
449 | continue; | |
450 | ||
451 | if (*l == ';') | |
452 | continue; | |
453 | ||
454 | (void) loader(d, *f, n, l); | |
455 | } | |
456 | } | |
457 | ||
458 | return 0; | |
459 | } | |
460 | ||
93bab288 YW |
461 | static int domain_name_cmp(char * const *a, char * const *b) { |
462 | return dns_name_compare_func(*a, *b); | |
bec69050 LP |
463 | } |
464 | ||
465 | static int dns_trust_anchor_dump(DnsTrustAnchor *d) { | |
8e54f5d9 LP |
466 | DnsAnswer *a; |
467 | Iterator i; | |
468 | ||
469 | assert(d); | |
470 | ||
105f6c4b LP |
471 | if (hashmap_isempty(d->positive_by_key)) |
472 | log_info("No positive trust anchors defined."); | |
473 | else { | |
474 | log_info("Positive Trust Anchors:"); | |
475 | HASHMAP_FOREACH(a, d->positive_by_key, i) { | |
476 | DnsResourceRecord *rr; | |
477 | ||
478 | DNS_ANSWER_FOREACH(rr, a) | |
479 | log_info("%s", dns_resource_record_to_string(rr)); | |
480 | } | |
8e54f5d9 LP |
481 | } |
482 | ||
105f6c4b LP |
483 | if (set_isempty(d->negative_by_name)) |
484 | log_info("No negative trust anchors defined."); | |
485 | else { | |
bec69050 LP |
486 | _cleanup_free_ char **l = NULL, *j = NULL; |
487 | ||
488 | l = set_get_strv(d->negative_by_name); | |
489 | if (!l) | |
490 | return log_oom(); | |
8e54f5d9 | 491 | |
93bab288 | 492 | typesafe_qsort(l, set_size(d->negative_by_name), domain_name_cmp); |
bec69050 LP |
493 | |
494 | j = strv_join(l, " "); | |
495 | if (!j) | |
496 | return log_oom(); | |
497 | ||
498 | log_info("Negative trust anchors: %s", j); | |
8e54f5d9 | 499 | } |
bec69050 LP |
500 | |
501 | return 0; | |
8e54f5d9 LP |
502 | } |
503 | ||
504 | int dns_trust_anchor_load(DnsTrustAnchor *d) { | |
505 | int r; | |
506 | ||
507 | assert(d); | |
508 | ||
509 | /* If loading things from disk fails, we don't consider this fatal */ | |
510 | (void) dns_trust_anchor_load_files(d, ".positive", dns_trust_anchor_load_positive); | |
511 | (void) dns_trust_anchor_load_files(d, ".negative", dns_trust_anchor_load_negative); | |
512 | ||
513 | /* However, if the built-in DS fails, then we have a problem. */ | |
30c77809 LP |
514 | r = dns_trust_anchor_add_builtin_positive(d); |
515 | if (r < 0) | |
516 | return log_error_errno(r, "Failed to add built-in positive trust anchor: %m"); | |
517 | ||
518 | r = dns_trust_anchor_add_builtin_negative(d); | |
8e54f5d9 | 519 | if (r < 0) |
30c77809 | 520 | return log_error_errno(r, "Failed to add built-in negative trust anchor: %m"); |
8e54f5d9 LP |
521 | |
522 | dns_trust_anchor_dump(d); | |
523 | ||
0d2cd476 LP |
524 | return 0; |
525 | } | |
526 | ||
527 | void dns_trust_anchor_flush(DnsTrustAnchor *d) { | |
0d2cd476 LP |
528 | assert(d); |
529 | ||
224b0e7a ZJS |
530 | d->positive_by_key = hashmap_free_with_destructor(d->positive_by_key, dns_answer_unref); |
531 | d->revoked_by_rr = set_free_with_destructor(d->revoked_by_rr, dns_resource_record_unref); | |
8e54f5d9 | 532 | d->negative_by_name = set_free_free(d->negative_by_name); |
0d2cd476 LP |
533 | } |
534 | ||
8e54f5d9 | 535 | int dns_trust_anchor_lookup_positive(DnsTrustAnchor *d, const DnsResourceKey *key, DnsAnswer **ret) { |
0d2cd476 LP |
536 | DnsAnswer *a; |
537 | ||
538 | assert(d); | |
539 | assert(key); | |
540 | assert(ret); | |
541 | ||
542 | /* We only serve DS and DNSKEY RRs. */ | |
543 | if (!IN_SET(key->type, DNS_TYPE_DS, DNS_TYPE_DNSKEY)) | |
544 | return 0; | |
545 | ||
8e54f5d9 | 546 | a = hashmap_get(d->positive_by_key, key); |
0d2cd476 LP |
547 | if (!a) |
548 | return 0; | |
549 | ||
550 | *ret = dns_answer_ref(a); | |
551 | return 1; | |
552 | } | |
8e54f5d9 LP |
553 | |
554 | int dns_trust_anchor_lookup_negative(DnsTrustAnchor *d, const char *name) { | |
c775838a LP |
555 | int r; |
556 | ||
8e54f5d9 LP |
557 | assert(d); |
558 | assert(name); | |
559 | ||
c775838a LP |
560 | for (;;) { |
561 | /* If the domain is listed as-is in the NTA database, then that counts */ | |
562 | if (set_contains(d->negative_by_name, name)) | |
563 | return true; | |
564 | ||
565 | /* If the domain isn't listed as NTA, but is listed as positive trust anchor, then that counts. See RFC | |
566 | * 7646, section 1.1 */ | |
567 | if (hashmap_contains(d->positive_by_key, &DNS_RESOURCE_KEY_CONST(DNS_CLASS_IN, DNS_TYPE_DS, name))) | |
568 | return false; | |
569 | ||
570 | if (hashmap_contains(d->positive_by_key, &DNS_RESOURCE_KEY_CONST(DNS_CLASS_IN, DNS_TYPE_KEY, name))) | |
571 | return false; | |
572 | ||
573 | /* And now, let's look at the parent, and check that too */ | |
574 | r = dns_name_parent(&name); | |
575 | if (r < 0) | |
576 | return r; | |
577 | if (r == 0) | |
578 | break; | |
579 | } | |
580 | ||
581 | return false; | |
8e54f5d9 | 582 | } |
0c857028 | 583 | |
c9c72065 LP |
584 | static int dns_trust_anchor_revoked_put(DnsTrustAnchor *d, DnsResourceRecord *rr) { |
585 | int r; | |
586 | ||
587 | assert(d); | |
588 | ||
de7fef4b | 589 | r = set_ensure_put(&d->revoked_by_rr, &dns_resource_record_hash_ops, rr); |
c9c72065 LP |
590 | if (r < 0) |
591 | return r; | |
592 | if (r > 0) | |
593 | dns_resource_record_ref(rr); | |
594 | ||
595 | return r; | |
596 | } | |
597 | ||
0c857028 LP |
598 | static int dns_trust_anchor_remove_revoked(DnsTrustAnchor *d, DnsResourceRecord *rr) { |
599 | _cleanup_(dns_answer_unrefp) DnsAnswer *new_answer = NULL; | |
600 | DnsAnswer *old_answer; | |
601 | int r; | |
602 | ||
c9c72065 LP |
603 | /* Remember that this is a revoked trust anchor RR */ |
604 | r = dns_trust_anchor_revoked_put(d, rr); | |
605 | if (r < 0) | |
606 | return r; | |
607 | ||
608 | /* Remove this from the positive trust anchor */ | |
0c857028 LP |
609 | old_answer = hashmap_get(d->positive_by_key, rr->key); |
610 | if (!old_answer) | |
611 | return 0; | |
612 | ||
613 | new_answer = dns_answer_ref(old_answer); | |
614 | ||
615 | r = dns_answer_remove_by_rr(&new_answer, rr); | |
616 | if (r <= 0) | |
617 | return r; | |
618 | ||
619 | /* We found the key! Warn the user */ | |
620 | log_struct(LOG_WARNING, | |
2b044526 | 621 | "MESSAGE_ID=" SD_MESSAGE_DNSSEC_TRUST_ANCHOR_REVOKED_STR, |
2cda08fd ZJS |
622 | LOG_MESSAGE("DNSSEC trust anchor %s has been revoked.\n" |
623 | "Please update the trust anchor, or upgrade your operating system.", | |
624 | strna(dns_resource_record_to_string(rr))), | |
a1230ff9 | 625 | "TRUST_ANCHOR=%s", dns_resource_record_to_string(rr)); |
0c857028 LP |
626 | |
627 | if (dns_answer_size(new_answer) <= 0) { | |
628 | assert_se(hashmap_remove(d->positive_by_key, rr->key) == old_answer); | |
629 | dns_answer_unref(old_answer); | |
630 | return 1; | |
631 | } | |
632 | ||
633 | r = hashmap_replace(d->positive_by_key, new_answer->items[0].rr->key, new_answer); | |
634 | if (r < 0) | |
635 | return r; | |
636 | ||
637 | new_answer = NULL; | |
638 | dns_answer_unref(old_answer); | |
639 | return 1; | |
640 | } | |
641 | ||
642 | static int dns_trust_anchor_check_revoked_one(DnsTrustAnchor *d, DnsResourceRecord *revoked_dnskey) { | |
643 | DnsAnswer *a; | |
644 | int r; | |
645 | ||
646 | assert(d); | |
647 | assert(revoked_dnskey); | |
648 | assert(revoked_dnskey->key->type == DNS_TYPE_DNSKEY); | |
649 | assert(revoked_dnskey->dnskey.flags & DNSKEY_FLAG_REVOKE); | |
650 | ||
651 | a = hashmap_get(d->positive_by_key, revoked_dnskey->key); | |
652 | if (a) { | |
653 | DnsResourceRecord *anchor; | |
654 | ||
655 | /* First, look for the precise DNSKEY in our trust anchor database */ | |
656 | ||
657 | DNS_ANSWER_FOREACH(anchor, a) { | |
658 | ||
659 | if (anchor->dnskey.protocol != revoked_dnskey->dnskey.protocol) | |
660 | continue; | |
661 | ||
662 | if (anchor->dnskey.algorithm != revoked_dnskey->dnskey.algorithm) | |
663 | continue; | |
664 | ||
665 | if (anchor->dnskey.key_size != revoked_dnskey->dnskey.key_size) | |
666 | continue; | |
667 | ||
c9c72065 LP |
668 | /* Note that we allow the REVOKE bit to be |
669 | * different! It will be set in the revoked | |
670 | * key, but unset in our version of it */ | |
0c857028 LP |
671 | if (((anchor->dnskey.flags ^ revoked_dnskey->dnskey.flags) | DNSKEY_FLAG_REVOKE) != DNSKEY_FLAG_REVOKE) |
672 | continue; | |
673 | ||
674 | if (memcmp(anchor->dnskey.key, revoked_dnskey->dnskey.key, anchor->dnskey.key_size) != 0) | |
675 | continue; | |
676 | ||
677 | dns_trust_anchor_remove_revoked(d, anchor); | |
678 | break; | |
679 | } | |
680 | } | |
681 | ||
1c02e7ba | 682 | 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 |
683 | if (a) { |
684 | DnsResourceRecord *anchor; | |
685 | ||
686 | /* Second, look for DS RRs matching this DNSKEY in our trust anchor database */ | |
687 | ||
688 | DNS_ANSWER_FOREACH(anchor, a) { | |
689 | ||
c9c72065 LP |
690 | /* We set mask_revoke to true here, since our |
691 | * DS fingerprint will be the one of the | |
692 | * unrevoked DNSKEY, but the one we got passed | |
693 | * here has the bit set. */ | |
96bb7673 | 694 | r = dnssec_verify_dnskey_by_ds(revoked_dnskey, anchor, true); |
0c857028 LP |
695 | if (r < 0) |
696 | return r; | |
697 | if (r == 0) | |
698 | continue; | |
699 | ||
700 | dns_trust_anchor_remove_revoked(d, anchor); | |
701 | break; | |
702 | } | |
703 | } | |
704 | ||
705 | return 0; | |
706 | } | |
707 | ||
d424da2a LP |
708 | int dns_trust_anchor_check_revoked(DnsTrustAnchor *d, DnsResourceRecord *dnskey, DnsAnswer *rrs) { |
709 | DnsResourceRecord *rrsig; | |
0c857028 LP |
710 | int r; |
711 | ||
712 | assert(d); | |
d424da2a LP |
713 | assert(dnskey); |
714 | ||
715 | /* Looks if "dnskey" is a self-signed RR that has been revoked | |
716 | * and matches one of our trust anchor entries. If so, removes | |
717 | * it from the trust anchor and returns > 0. */ | |
0c857028 | 718 | |
d424da2a LP |
719 | if (dnskey->key->type != DNS_TYPE_DNSKEY) |
720 | return 0; | |
0c857028 | 721 | |
d424da2a LP |
722 | /* Is this DNSKEY revoked? */ |
723 | if ((dnskey->dnskey.flags & DNSKEY_FLAG_REVOKE) == 0) | |
0c857028 LP |
724 | return 0; |
725 | ||
d424da2a LP |
726 | /* Could this be interesting to us at all? If not, |
727 | * there's no point in looking for and verifying a | |
728 | * self-signed RRSIG. */ | |
1c02e7ba | 729 | if (!dns_trust_anchor_knows_domain_positive(d, dns_resource_key_name(dnskey->key))) |
d424da2a LP |
730 | return 0; |
731 | ||
732 | /* Look for a self-signed RRSIG in the other rrs belonging to this DNSKEY */ | |
733 | DNS_ANSWER_FOREACH(rrsig, rrs) { | |
0c857028 LP |
734 | DnssecResult result; |
735 | ||
d424da2a LP |
736 | if (rrsig->key->type != DNS_TYPE_RRSIG) |
737 | continue; | |
738 | ||
739 | r = dnssec_rrsig_match_dnskey(rrsig, dnskey, true); | |
0c857028 LP |
740 | if (r < 0) |
741 | return r; | |
742 | if (r == 0) | |
743 | continue; | |
744 | ||
d424da2a LP |
745 | r = dnssec_verify_rrset(rrs, dnskey->key, rrsig, dnskey, USEC_INFINITY, &result); |
746 | if (r < 0) | |
747 | return r; | |
748 | if (result != DNSSEC_VALIDATED) | |
0c857028 LP |
749 | continue; |
750 | ||
d424da2a LP |
751 | /* Bingo! This is a revoked self-signed DNSKEY. Let's |
752 | * see if this precise one exists in our trust anchor | |
753 | * database, too. */ | |
754 | r = dns_trust_anchor_check_revoked_one(d, dnskey); | |
755 | if (r < 0) | |
756 | return r; | |
0c857028 | 757 | |
d424da2a | 758 | return 1; |
0c857028 LP |
759 | } |
760 | ||
761 | return 0; | |
762 | } | |
c9c72065 LP |
763 | |
764 | int dns_trust_anchor_is_revoked(DnsTrustAnchor *d, DnsResourceRecord *rr) { | |
765 | assert(d); | |
766 | ||
767 | if (!IN_SET(rr->key->type, DNS_TYPE_DS, DNS_TYPE_DNSKEY)) | |
768 | return 0; | |
769 | ||
770 | return set_contains(d->revoked_by_rr, rr); | |
771 | } |