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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
0d2cd476 LP |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright 2015 Lennart Poettering | |
6 | ||
7 | systemd is free software; you can redistribute it and/or modify it | |
8 | under the terms of the GNU Lesser General Public License as published by | |
9 | the Free Software Foundation; either version 2.1 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | systemd is distributed in the hope that it will be useful, but | |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | Lesser General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU Lesser General Public License | |
18 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
19 | ***/ | |
20 | ||
62cc1c55 | 21 | #include "sd-messages.h" |
0c857028 | 22 | |
0d2cd476 | 23 | #include "alloc-util.h" |
8e54f5d9 LP |
24 | #include "conf-files.h" |
25 | #include "def.h" | |
26 | #include "dns-domain.h" | |
27 | #include "fd-util.h" | |
28 | #include "fileio.h" | |
29 | #include "hexdecoct.h" | |
30 | #include "parse-util.h" | |
0d2cd476 | 31 | #include "resolved-dns-trust-anchor.h" |
0c857028 | 32 | #include "resolved-dns-dnssec.h" |
8e54f5d9 LP |
33 | #include "set.h" |
34 | #include "string-util.h" | |
35 | #include "strv.h" | |
0d2cd476 | 36 | |
e7d179ac | 37 | static const char trust_anchor_dirs[] = CONF_PATHS_NULSTR("dnssec-trust-anchors.d"); |
8e54f5d9 | 38 | |
3401f0e1 LP |
39 | /* The first DS RR from https://data.iana.org/root-anchors/root-anchors.xml, retrieved December 2015 */ |
40 | static const uint8_t root_digest1[] = | |
0d2cd476 LP |
41 | { 0x49, 0xAA, 0xC1, 0x1D, 0x7B, 0x6F, 0x64, 0x46, 0x70, 0x2E, 0x54, 0xA1, 0x60, 0x73, 0x71, 0x60, |
42 | 0x7A, 0x1A, 0x41, 0x85, 0x52, 0x00, 0xFD, 0x2C, 0xE1, 0xCD, 0xDE, 0x32, 0xF2, 0x4E, 0x8F, 0xB5 }; | |
43 | ||
3401f0e1 LP |
44 | /* The second DS RR from https://data.iana.org/root-anchors/root-anchors.xml, retrieved February 2017 */ |
45 | static const uint8_t root_digest2[] = | |
46 | { 0xE0, 0x6D, 0x44, 0xB8, 0x0B, 0x8F, 0x1D, 0x39, 0xA9, 0x5C, 0x0B, 0x0D, 0x7C, 0x65, 0xD0, 0x84, | |
47 | 0x58, 0xE8, 0x80, 0x40, 0x9B, 0xBC, 0x68, 0x34, 0x57, 0x10, 0x42, 0x37, 0xC7, 0xF8, 0xEC, 0x8D }; | |
48 | ||
86e9cbca LP |
49 | static bool dns_trust_anchor_knows_domain_positive(DnsTrustAnchor *d, const char *name) { |
50 | assert(d); | |
51 | ||
52 | /* Returns true if there's an entry for the specified domain | |
53 | * name in our trust anchor */ | |
54 | ||
55 | return | |
56 | hashmap_contains(d->positive_by_key, &DNS_RESOURCE_KEY_CONST(DNS_CLASS_IN, DNS_TYPE_DNSKEY, name)) || | |
57 | hashmap_contains(d->positive_by_key, &DNS_RESOURCE_KEY_CONST(DNS_CLASS_IN, DNS_TYPE_DS, name)); | |
58 | } | |
59 | ||
3401f0e1 LP |
60 | static int add_root_ksk( |
61 | DnsAnswer *answer, | |
62 | DnsResourceKey *key, | |
63 | uint16_t key_tag, | |
64 | uint8_t algorithm, | |
65 | uint8_t digest_type, | |
66 | const void *digest, | |
67 | size_t digest_size) { | |
68 | ||
0d2cd476 | 69 | _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *rr = NULL; |
3401f0e1 LP |
70 | int r; |
71 | ||
72 | rr = dns_resource_record_new(key); | |
73 | if (!rr) | |
74 | return -ENOMEM; | |
75 | ||
76 | rr->ds.key_tag = key_tag; | |
77 | rr->ds.algorithm = algorithm; | |
78 | rr->ds.digest_type = digest_type; | |
79 | rr->ds.digest_size = digest_size; | |
80 | rr->ds.digest = memdup(digest, rr->ds.digest_size); | |
81 | if (!rr->ds.digest) | |
82 | return -ENOMEM; | |
83 | ||
84 | r = dns_answer_add(answer, rr, 0, DNS_ANSWER_AUTHENTICATED); | |
85 | if (r < 0) | |
86 | return r; | |
87 | ||
88 | return 0; | |
89 | } | |
90 | ||
91 | static int dns_trust_anchor_add_builtin_positive(DnsTrustAnchor *d) { | |
0d2cd476 | 92 | _cleanup_(dns_answer_unrefp) DnsAnswer *answer = NULL; |
3401f0e1 | 93 | _cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL; |
0d2cd476 LP |
94 | int r; |
95 | ||
96 | assert(d); | |
97 | ||
8e54f5d9 | 98 | r = hashmap_ensure_allocated(&d->positive_by_key, &dns_resource_key_hash_ops); |
0d2cd476 LP |
99 | if (r < 0) |
100 | return r; | |
101 | ||
3401f0e1 LP |
102 | /* Only add the built-in trust anchor if there's neither a DS nor a DNSKEY defined for the root domain. That |
103 | * way users have an easy way to override the root domain DS/DNSKEY data. */ | |
86e9cbca | 104 | if (dns_trust_anchor_knows_domain_positive(d, ".")) |
d76f90f1 LP |
105 | return 0; |
106 | ||
3401f0e1 LP |
107 | key = dns_resource_key_new(DNS_CLASS_IN, DNS_TYPE_DS, ""); |
108 | if (!key) | |
0d2cd476 LP |
109 | return -ENOMEM; |
110 | ||
3401f0e1 | 111 | answer = dns_answer_new(2); |
0d2cd476 LP |
112 | if (!answer) |
113 | return -ENOMEM; | |
114 | ||
3401f0e1 LP |
115 | /* Add the two RRs from https://data.iana.org/root-anchors/root-anchors.xml */ |
116 | r = add_root_ksk(answer, key, 19036, DNSSEC_ALGORITHM_RSASHA256, DNSSEC_DIGEST_SHA256, root_digest1, sizeof(root_digest1)); | |
117 | if (r < 0) | |
118 | return r; | |
119 | ||
120 | r = add_root_ksk(answer, key, 20326, DNSSEC_ALGORITHM_RSASHA256, DNSSEC_DIGEST_SHA256, root_digest2, sizeof(root_digest2)); | |
0d2cd476 LP |
121 | if (r < 0) |
122 | return r; | |
123 | ||
3401f0e1 | 124 | r = hashmap_put(d->positive_by_key, key, answer); |
8e54f5d9 LP |
125 | if (r < 0) |
126 | return r; | |
127 | ||
128 | answer = NULL; | |
129 | return 0; | |
130 | } | |
131 | ||
30c77809 LP |
132 | static int dns_trust_anchor_add_builtin_negative(DnsTrustAnchor *d) { |
133 | ||
134 | static const char private_domains[] = | |
135 | /* RFC 6761 says that .test is a special domain for | |
136 | * testing and not to be installed in the root zone */ | |
137 | "test\0" | |
138 | ||
139 | /* RFC 6761 says that these reverse IP lookup ranges | |
140 | * are for private addresses, and hence should not | |
141 | * show up in the root zone */ | |
142 | "10.in-addr.arpa\0" | |
143 | "16.172.in-addr.arpa\0" | |
144 | "17.172.in-addr.arpa\0" | |
145 | "18.172.in-addr.arpa\0" | |
146 | "19.172.in-addr.arpa\0" | |
147 | "20.172.in-addr.arpa\0" | |
148 | "21.172.in-addr.arpa\0" | |
149 | "22.172.in-addr.arpa\0" | |
150 | "23.172.in-addr.arpa\0" | |
151 | "24.172.in-addr.arpa\0" | |
152 | "25.172.in-addr.arpa\0" | |
153 | "26.172.in-addr.arpa\0" | |
154 | "27.172.in-addr.arpa\0" | |
155 | "28.172.in-addr.arpa\0" | |
156 | "29.172.in-addr.arpa\0" | |
157 | "30.172.in-addr.arpa\0" | |
158 | "31.172.in-addr.arpa\0" | |
159 | "168.192.in-addr.arpa\0" | |
160 | ||
f07529fe LP |
161 | /* The same, but for IPv6. */ |
162 | "d.f.ip6.arpa\0" | |
163 | ||
30c77809 LP |
164 | /* RFC 6762 reserves the .local domain for Multicast |
165 | * DNS, it hence cannot appear in the root zone. (Note | |
166 | * that we by default do not route .local traffic to | |
167 | * DNS anyway, except when a configured search domain | |
168 | * suggests so.) */ | |
169 | "local\0" | |
170 | ||
171 | /* These two are well known, popular private zone | |
172 | * TLDs, that are blocked from delegation, according | |
173 | * to: | |
174 | * http://icannwiki.com/Name_Collision#NGPC_Resolution | |
175 | * | |
176 | * There's also ongoing work on making this official | |
177 | * in an RRC: | |
178 | * https://www.ietf.org/archive/id/draft-chapin-additional-reserved-tlds-02.txt */ | |
179 | "home\0" | |
180 | "corp\0" | |
181 | ||
182 | /* The following four TLDs are suggested for private | |
183 | * zones in RFC 6762, Appendix G, and are hence very | |
184 | * unlikely to be made official TLDs any day soon */ | |
185 | "lan\0" | |
186 | "intranet\0" | |
187 | "internal\0" | |
188 | "private\0"; | |
189 | ||
190 | const char *name; | |
191 | int r; | |
192 | ||
193 | assert(d); | |
194 | ||
195 | /* Only add the built-in trust anchor if there's no negative | |
196 | * trust anchor defined at all. This enables easy overriding | |
197 | * of negative trust anchors. */ | |
198 | ||
199 | if (set_size(d->negative_by_name) > 0) | |
200 | return 0; | |
201 | ||
202 | r = set_ensure_allocated(&d->negative_by_name, &dns_name_hash_ops); | |
203 | if (r < 0) | |
204 | return r; | |
205 | ||
206 | /* We add a couple of domains as default negative trust | |
207 | * anchors, where it's very unlikely they will be installed in | |
208 | * the root zone. If they exist they must be private, and thus | |
209 | * unsigned. */ | |
210 | ||
211 | NULSTR_FOREACH(name, private_domains) { | |
212 | ||
213 | if (dns_trust_anchor_knows_domain_positive(d, name)) | |
214 | continue; | |
215 | ||
216 | r = set_put_strdup(d->negative_by_name, name); | |
217 | if (r < 0) | |
218 | return r; | |
219 | } | |
220 | ||
221 | return 0; | |
222 | } | |
223 | ||
8e54f5d9 LP |
224 | static int dns_trust_anchor_load_positive(DnsTrustAnchor *d, const char *path, unsigned line, const char *s) { |
225 | _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *rr = NULL; | |
226 | _cleanup_free_ char *domain = NULL, *class = NULL, *type = NULL; | |
227 | _cleanup_(dns_answer_unrefp) DnsAnswer *answer = NULL; | |
228 | DnsAnswer *old_answer = NULL; | |
229 | const char *p = s; | |
230 | int r; | |
231 | ||
232 | assert(d); | |
233 | assert(line); | |
234 | ||
235 | r = extract_first_word(&p, &domain, NULL, EXTRACT_QUOTES); | |
236 | if (r < 0) | |
237 | return log_warning_errno(r, "Unable to parse domain in line %s:%u: %m", path, line); | |
238 | ||
239 | if (!dns_name_is_valid(domain)) { | |
240 | log_warning("Domain name %s is invalid, at line %s:%u, ignoring line.", domain, path, line); | |
241 | return -EINVAL; | |
242 | } | |
243 | ||
244 | r = extract_many_words(&p, NULL, 0, &class, &type, NULL); | |
245 | if (r < 0) | |
246 | return log_warning_errno(r, "Unable to parse class and type in line %s:%u: %m", path, line); | |
247 | if (r != 2) { | |
248 | log_warning("Missing class or type in line %s:%u", path, line); | |
249 | return -EINVAL; | |
250 | } | |
251 | ||
252 | if (!strcaseeq(class, "IN")) { | |
253 | log_warning("RR class %s is not supported, ignoring line %s:%u.", class, path, line); | |
254 | return -EINVAL; | |
255 | } | |
256 | ||
257 | if (strcaseeq(type, "DS")) { | |
258 | _cleanup_free_ char *key_tag = NULL, *algorithm = NULL, *digest_type = NULL, *digest = NULL; | |
259 | _cleanup_free_ void *dd = NULL; | |
260 | uint16_t kt; | |
261 | int a, dt; | |
262 | size_t l; | |
263 | ||
264 | r = extract_many_words(&p, NULL, 0, &key_tag, &algorithm, &digest_type, &digest, NULL); | |
265 | if (r < 0) { | |
266 | log_warning_errno(r, "Failed to parse DS parameters on line %s:%u: %m", path, line); | |
267 | return -EINVAL; | |
268 | } | |
269 | if (r != 4) { | |
270 | log_warning("Missing DS parameters on line %s:%u", path, line); | |
271 | return -EINVAL; | |
272 | } | |
273 | ||
274 | r = safe_atou16(key_tag, &kt); | |
275 | if (r < 0) | |
276 | return log_warning_errno(r, "Failed to parse DS key tag %s on line %s:%u: %m", key_tag, path, line); | |
277 | ||
278 | a = dnssec_algorithm_from_string(algorithm); | |
279 | if (a < 0) { | |
280 | log_warning("Failed to parse DS algorithm %s on line %s:%u", algorithm, path, line); | |
281 | return -EINVAL; | |
282 | } | |
283 | ||
284 | dt = dnssec_digest_from_string(digest_type); | |
285 | if (dt < 0) { | |
286 | log_warning("Failed to parse DS digest type %s on line %s:%u", digest_type, path, line); | |
287 | return -EINVAL; | |
288 | } | |
289 | ||
290 | r = unhexmem(digest, strlen(digest), &dd, &l); | |
291 | if (r < 0) { | |
292 | log_warning("Failed to parse DS digest %s on line %s:%u", digest, path, line); | |
293 | return -EINVAL; | |
294 | } | |
295 | ||
296 | rr = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_DS, domain); | |
297 | if (!rr) | |
298 | return log_oom(); | |
299 | ||
300 | rr->ds.key_tag = kt; | |
301 | rr->ds.algorithm = a; | |
302 | rr->ds.digest_type = dt; | |
303 | rr->ds.digest_size = l; | |
304 | rr->ds.digest = dd; | |
305 | dd = NULL; | |
306 | ||
307 | } else if (strcaseeq(type, "DNSKEY")) { | |
308 | _cleanup_free_ char *flags = NULL, *protocol = NULL, *algorithm = NULL, *key = NULL; | |
309 | _cleanup_free_ void *k = NULL; | |
310 | uint16_t f; | |
311 | size_t l; | |
312 | int a; | |
313 | ||
314 | r = extract_many_words(&p, NULL, 0, &flags, &protocol, &algorithm, &key, NULL); | |
315 | if (r < 0) | |
316 | return log_warning_errno(r, "Failed to parse DNSKEY parameters on line %s:%u: %m", path, line); | |
317 | if (r != 4) { | |
318 | log_warning("Missing DNSKEY parameters on line %s:%u", path, line); | |
319 | return -EINVAL; | |
320 | } | |
321 | ||
322 | if (!streq(protocol, "3")) { | |
323 | log_warning("DNSKEY Protocol is not 3 on line %s:%u", path, line); | |
324 | return -EINVAL; | |
325 | } | |
326 | ||
327 | r = safe_atou16(flags, &f); | |
328 | if (r < 0) | |
329 | return log_warning_errno(r, "Failed to parse DNSKEY flags field %s on line %s:%u", flags, path, line); | |
2a0d751b LP |
330 | if ((f & DNSKEY_FLAG_ZONE_KEY) == 0) { |
331 | log_warning("DNSKEY lacks zone key bit set on line %s:%u", path, line); | |
332 | return -EINVAL; | |
333 | } | |
334 | if ((f & DNSKEY_FLAG_REVOKE)) { | |
335 | log_warning("DNSKEY is already revoked on line %s:%u", path, line); | |
336 | return -EINVAL; | |
337 | } | |
8e54f5d9 LP |
338 | |
339 | a = dnssec_algorithm_from_string(algorithm); | |
340 | if (a < 0) { | |
341 | log_warning("Failed to parse DNSKEY algorithm %s on line %s:%u", algorithm, path, line); | |
342 | return -EINVAL; | |
343 | } | |
344 | ||
345 | r = unbase64mem(key, strlen(key), &k, &l); | |
346 | if (r < 0) | |
347 | return log_warning_errno(r, "Failed to parse DNSKEY key data %s on line %s:%u", key, path, line); | |
348 | ||
349 | rr = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_DNSKEY, domain); | |
350 | if (!rr) | |
351 | return log_oom(); | |
352 | ||
353 | rr->dnskey.flags = f; | |
354 | rr->dnskey.protocol = 3; | |
355 | rr->dnskey.algorithm = a; | |
356 | rr->dnskey.key_size = l; | |
357 | rr->dnskey.key = k; | |
358 | k = NULL; | |
359 | ||
360 | } else { | |
361 | log_warning("RR type %s is not supported, ignoring line %s:%u.", type, path, line); | |
362 | return -EINVAL; | |
363 | } | |
364 | ||
365 | if (!isempty(p)) { | |
366 | log_warning("Trailing garbage on line %s:%u, ignoring line.", path, line); | |
367 | return -EINVAL; | |
368 | } | |
369 | ||
370 | r = hashmap_ensure_allocated(&d->positive_by_key, &dns_resource_key_hash_ops); | |
0d2cd476 | 371 | if (r < 0) |
b3331c39 | 372 | return log_oom(); |
0d2cd476 | 373 | |
8e54f5d9 LP |
374 | old_answer = hashmap_get(d->positive_by_key, rr->key); |
375 | answer = dns_answer_ref(old_answer); | |
376 | ||
377 | r = dns_answer_add_extend(&answer, rr, 0, DNS_ANSWER_AUTHENTICATED); | |
378 | if (r < 0) | |
379 | return log_error_errno(r, "Failed to add trust anchor RR: %m"); | |
380 | ||
381 | r = hashmap_replace(d->positive_by_key, rr->key, answer); | |
382 | if (r < 0) | |
383 | return log_error_errno(r, "Failed to add answer to trust anchor: %m"); | |
384 | ||
385 | old_answer = dns_answer_unref(old_answer); | |
0d2cd476 | 386 | answer = NULL; |
8e54f5d9 LP |
387 | |
388 | return 0; | |
389 | } | |
390 | ||
391 | static int dns_trust_anchor_load_negative(DnsTrustAnchor *d, const char *path, unsigned line, const char *s) { | |
392 | _cleanup_free_ char *domain = NULL; | |
393 | const char *p = s; | |
394 | int r; | |
395 | ||
396 | assert(d); | |
397 | assert(line); | |
398 | ||
399 | r = extract_first_word(&p, &domain, NULL, EXTRACT_QUOTES); | |
400 | if (r < 0) | |
401 | return log_warning_errno(r, "Unable to parse line %s:%u: %m", path, line); | |
402 | ||
403 | if (!dns_name_is_valid(domain)) { | |
404 | log_warning("Domain name %s is invalid, at line %s:%u, ignoring line.", domain, path, line); | |
405 | return -EINVAL; | |
406 | } | |
407 | ||
408 | if (!isempty(p)) { | |
409 | log_warning("Trailing garbage at line %s:%u, ignoring line.", path, line); | |
410 | return -EINVAL; | |
411 | } | |
412 | ||
413 | r = set_ensure_allocated(&d->negative_by_name, &dns_name_hash_ops); | |
414 | if (r < 0) | |
b3331c39 | 415 | return log_oom(); |
8e54f5d9 LP |
416 | |
417 | r = set_put(d->negative_by_name, domain); | |
418 | if (r < 0) | |
419 | return log_oom(); | |
420 | if (r > 0) | |
421 | domain = NULL; | |
422 | ||
423 | return 0; | |
424 | } | |
425 | ||
426 | static int dns_trust_anchor_load_files( | |
427 | DnsTrustAnchor *d, | |
428 | const char *suffix, | |
429 | int (*loader)(DnsTrustAnchor *d, const char *path, unsigned n, const char *line)) { | |
430 | ||
431 | _cleanup_strv_free_ char **files = NULL; | |
432 | char **f; | |
433 | int r; | |
434 | ||
435 | assert(d); | |
436 | assert(suffix); | |
437 | assert(loader); | |
438 | ||
b5084605 | 439 | r = conf_files_list_nulstr(&files, suffix, NULL, 0, trust_anchor_dirs); |
8e54f5d9 LP |
440 | if (r < 0) |
441 | return log_error_errno(r, "Failed to enumerate %s trust anchor files: %m", suffix); | |
442 | ||
443 | STRV_FOREACH(f, files) { | |
444 | _cleanup_fclose_ FILE *g = NULL; | |
445 | char line[LINE_MAX]; | |
446 | unsigned n = 0; | |
447 | ||
448 | g = fopen(*f, "r"); | |
449 | if (!g) { | |
450 | if (errno == ENOENT) | |
451 | continue; | |
452 | ||
453 | log_warning_errno(errno, "Failed to open %s: %m", *f); | |
454 | continue; | |
455 | } | |
456 | ||
457 | FOREACH_LINE(line, g, log_warning_errno(errno, "Failed to read %s, ignoring: %m", *f)) { | |
458 | char *l; | |
459 | ||
460 | n++; | |
461 | ||
462 | l = strstrip(line); | |
463 | if (isempty(l)) | |
464 | continue; | |
465 | ||
466 | if (*l == ';') | |
467 | continue; | |
468 | ||
469 | (void) loader(d, *f, n, l); | |
470 | } | |
471 | } | |
472 | ||
473 | return 0; | |
474 | } | |
475 | ||
bec69050 LP |
476 | static int domain_name_cmp(const void *a, const void *b) { |
477 | char **x = (char**) a, **y = (char**) b; | |
478 | ||
479 | return dns_name_compare_func(*x, *y); | |
480 | } | |
481 | ||
482 | static int dns_trust_anchor_dump(DnsTrustAnchor *d) { | |
8e54f5d9 LP |
483 | DnsAnswer *a; |
484 | Iterator i; | |
485 | ||
486 | assert(d); | |
487 | ||
105f6c4b LP |
488 | if (hashmap_isempty(d->positive_by_key)) |
489 | log_info("No positive trust anchors defined."); | |
490 | else { | |
491 | log_info("Positive Trust Anchors:"); | |
492 | HASHMAP_FOREACH(a, d->positive_by_key, i) { | |
493 | DnsResourceRecord *rr; | |
494 | ||
495 | DNS_ANSWER_FOREACH(rr, a) | |
496 | log_info("%s", dns_resource_record_to_string(rr)); | |
497 | } | |
8e54f5d9 LP |
498 | } |
499 | ||
105f6c4b LP |
500 | if (set_isempty(d->negative_by_name)) |
501 | log_info("No negative trust anchors defined."); | |
502 | else { | |
bec69050 LP |
503 | _cleanup_free_ char **l = NULL, *j = NULL; |
504 | ||
505 | l = set_get_strv(d->negative_by_name); | |
506 | if (!l) | |
507 | return log_oom(); | |
8e54f5d9 | 508 | |
bec69050 LP |
509 | qsort_safe(l, set_size(d->negative_by_name), sizeof(char*), domain_name_cmp); |
510 | ||
511 | j = strv_join(l, " "); | |
512 | if (!j) | |
513 | return log_oom(); | |
514 | ||
515 | log_info("Negative trust anchors: %s", j); | |
8e54f5d9 | 516 | } |
bec69050 LP |
517 | |
518 | return 0; | |
8e54f5d9 LP |
519 | } |
520 | ||
521 | int dns_trust_anchor_load(DnsTrustAnchor *d) { | |
522 | int r; | |
523 | ||
524 | assert(d); | |
525 | ||
526 | /* If loading things from disk fails, we don't consider this fatal */ | |
527 | (void) dns_trust_anchor_load_files(d, ".positive", dns_trust_anchor_load_positive); | |
528 | (void) dns_trust_anchor_load_files(d, ".negative", dns_trust_anchor_load_negative); | |
529 | ||
530 | /* However, if the built-in DS fails, then we have a problem. */ | |
30c77809 LP |
531 | r = dns_trust_anchor_add_builtin_positive(d); |
532 | if (r < 0) | |
533 | return log_error_errno(r, "Failed to add built-in positive trust anchor: %m"); | |
534 | ||
535 | r = dns_trust_anchor_add_builtin_negative(d); | |
8e54f5d9 | 536 | if (r < 0) |
30c77809 | 537 | return log_error_errno(r, "Failed to add built-in negative trust anchor: %m"); |
8e54f5d9 LP |
538 | |
539 | dns_trust_anchor_dump(d); | |
540 | ||
0d2cd476 LP |
541 | return 0; |
542 | } | |
543 | ||
544 | void dns_trust_anchor_flush(DnsTrustAnchor *d) { | |
545 | DnsAnswer *a; | |
c9c72065 | 546 | DnsResourceRecord *rr; |
0d2cd476 LP |
547 | |
548 | assert(d); | |
549 | ||
8e54f5d9 | 550 | while ((a = hashmap_steal_first(d->positive_by_key))) |
0d2cd476 | 551 | dns_answer_unref(a); |
8e54f5d9 | 552 | d->positive_by_key = hashmap_free(d->positive_by_key); |
c9c72065 LP |
553 | |
554 | while ((rr = set_steal_first(d->revoked_by_rr))) | |
555 | dns_resource_record_unref(rr); | |
556 | d->revoked_by_rr = set_free(d->revoked_by_rr); | |
557 | ||
8e54f5d9 | 558 | d->negative_by_name = set_free_free(d->negative_by_name); |
0d2cd476 LP |
559 | } |
560 | ||
8e54f5d9 | 561 | int dns_trust_anchor_lookup_positive(DnsTrustAnchor *d, const DnsResourceKey *key, DnsAnswer **ret) { |
0d2cd476 LP |
562 | DnsAnswer *a; |
563 | ||
564 | assert(d); | |
565 | assert(key); | |
566 | assert(ret); | |
567 | ||
568 | /* We only serve DS and DNSKEY RRs. */ | |
569 | if (!IN_SET(key->type, DNS_TYPE_DS, DNS_TYPE_DNSKEY)) | |
570 | return 0; | |
571 | ||
8e54f5d9 | 572 | a = hashmap_get(d->positive_by_key, key); |
0d2cd476 LP |
573 | if (!a) |
574 | return 0; | |
575 | ||
576 | *ret = dns_answer_ref(a); | |
577 | return 1; | |
578 | } | |
8e54f5d9 LP |
579 | |
580 | int dns_trust_anchor_lookup_negative(DnsTrustAnchor *d, const char *name) { | |
c775838a LP |
581 | int r; |
582 | ||
8e54f5d9 LP |
583 | assert(d); |
584 | assert(name); | |
585 | ||
c775838a LP |
586 | for (;;) { |
587 | /* If the domain is listed as-is in the NTA database, then that counts */ | |
588 | if (set_contains(d->negative_by_name, name)) | |
589 | return true; | |
590 | ||
591 | /* If the domain isn't listed as NTA, but is listed as positive trust anchor, then that counts. See RFC | |
592 | * 7646, section 1.1 */ | |
593 | if (hashmap_contains(d->positive_by_key, &DNS_RESOURCE_KEY_CONST(DNS_CLASS_IN, DNS_TYPE_DS, name))) | |
594 | return false; | |
595 | ||
596 | if (hashmap_contains(d->positive_by_key, &DNS_RESOURCE_KEY_CONST(DNS_CLASS_IN, DNS_TYPE_KEY, name))) | |
597 | return false; | |
598 | ||
599 | /* And now, let's look at the parent, and check that too */ | |
600 | r = dns_name_parent(&name); | |
601 | if (r < 0) | |
602 | return r; | |
603 | if (r == 0) | |
604 | break; | |
605 | } | |
606 | ||
607 | return false; | |
8e54f5d9 | 608 | } |
0c857028 | 609 | |
c9c72065 LP |
610 | static int dns_trust_anchor_revoked_put(DnsTrustAnchor *d, DnsResourceRecord *rr) { |
611 | int r; | |
612 | ||
613 | assert(d); | |
614 | ||
615 | r = set_ensure_allocated(&d->revoked_by_rr, &dns_resource_record_hash_ops); | |
616 | if (r < 0) | |
617 | return r; | |
618 | ||
619 | r = set_put(d->revoked_by_rr, rr); | |
620 | if (r < 0) | |
621 | return r; | |
622 | if (r > 0) | |
623 | dns_resource_record_ref(rr); | |
624 | ||
625 | return r; | |
626 | } | |
627 | ||
0c857028 LP |
628 | static int dns_trust_anchor_remove_revoked(DnsTrustAnchor *d, DnsResourceRecord *rr) { |
629 | _cleanup_(dns_answer_unrefp) DnsAnswer *new_answer = NULL; | |
630 | DnsAnswer *old_answer; | |
631 | int r; | |
632 | ||
c9c72065 LP |
633 | /* Remember that this is a revoked trust anchor RR */ |
634 | r = dns_trust_anchor_revoked_put(d, rr); | |
635 | if (r < 0) | |
636 | return r; | |
637 | ||
638 | /* Remove this from the positive trust anchor */ | |
0c857028 LP |
639 | old_answer = hashmap_get(d->positive_by_key, rr->key); |
640 | if (!old_answer) | |
641 | return 0; | |
642 | ||
643 | new_answer = dns_answer_ref(old_answer); | |
644 | ||
645 | r = dns_answer_remove_by_rr(&new_answer, rr); | |
646 | if (r <= 0) | |
647 | return r; | |
648 | ||
649 | /* We found the key! Warn the user */ | |
650 | log_struct(LOG_WARNING, | |
2b044526 | 651 | "MESSAGE_ID=" SD_MESSAGE_DNSSEC_TRUST_ANCHOR_REVOKED_STR, |
0c857028 LP |
652 | LOG_MESSAGE("DNSSEC Trust anchor %s has been revoked. Please update the trust anchor, or upgrade your operating system."), strna(dns_resource_record_to_string(rr)), |
653 | "TRUST_ANCHOR=%s", dns_resource_record_to_string(rr), | |
654 | NULL); | |
655 | ||
656 | if (dns_answer_size(new_answer) <= 0) { | |
657 | assert_se(hashmap_remove(d->positive_by_key, rr->key) == old_answer); | |
658 | dns_answer_unref(old_answer); | |
659 | return 1; | |
660 | } | |
661 | ||
662 | r = hashmap_replace(d->positive_by_key, new_answer->items[0].rr->key, new_answer); | |
663 | if (r < 0) | |
664 | return r; | |
665 | ||
666 | new_answer = NULL; | |
667 | dns_answer_unref(old_answer); | |
668 | return 1; | |
669 | } | |
670 | ||
671 | static int dns_trust_anchor_check_revoked_one(DnsTrustAnchor *d, DnsResourceRecord *revoked_dnskey) { | |
672 | DnsAnswer *a; | |
673 | int r; | |
674 | ||
675 | assert(d); | |
676 | assert(revoked_dnskey); | |
677 | assert(revoked_dnskey->key->type == DNS_TYPE_DNSKEY); | |
678 | assert(revoked_dnskey->dnskey.flags & DNSKEY_FLAG_REVOKE); | |
679 | ||
680 | a = hashmap_get(d->positive_by_key, revoked_dnskey->key); | |
681 | if (a) { | |
682 | DnsResourceRecord *anchor; | |
683 | ||
684 | /* First, look for the precise DNSKEY in our trust anchor database */ | |
685 | ||
686 | DNS_ANSWER_FOREACH(anchor, a) { | |
687 | ||
688 | if (anchor->dnskey.protocol != revoked_dnskey->dnskey.protocol) | |
689 | continue; | |
690 | ||
691 | if (anchor->dnskey.algorithm != revoked_dnskey->dnskey.algorithm) | |
692 | continue; | |
693 | ||
694 | if (anchor->dnskey.key_size != revoked_dnskey->dnskey.key_size) | |
695 | continue; | |
696 | ||
c9c72065 LP |
697 | /* Note that we allow the REVOKE bit to be |
698 | * different! It will be set in the revoked | |
699 | * key, but unset in our version of it */ | |
0c857028 LP |
700 | if (((anchor->dnskey.flags ^ revoked_dnskey->dnskey.flags) | DNSKEY_FLAG_REVOKE) != DNSKEY_FLAG_REVOKE) |
701 | continue; | |
702 | ||
703 | if (memcmp(anchor->dnskey.key, revoked_dnskey->dnskey.key, anchor->dnskey.key_size) != 0) | |
704 | continue; | |
705 | ||
706 | dns_trust_anchor_remove_revoked(d, anchor); | |
707 | break; | |
708 | } | |
709 | } | |
710 | ||
1c02e7ba | 711 | 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 |
712 | if (a) { |
713 | DnsResourceRecord *anchor; | |
714 | ||
715 | /* Second, look for DS RRs matching this DNSKEY in our trust anchor database */ | |
716 | ||
717 | DNS_ANSWER_FOREACH(anchor, a) { | |
718 | ||
c9c72065 LP |
719 | /* We set mask_revoke to true here, since our |
720 | * DS fingerprint will be the one of the | |
721 | * unrevoked DNSKEY, but the one we got passed | |
722 | * here has the bit set. */ | |
96bb7673 | 723 | r = dnssec_verify_dnskey_by_ds(revoked_dnskey, anchor, true); |
0c857028 LP |
724 | if (r < 0) |
725 | return r; | |
726 | if (r == 0) | |
727 | continue; | |
728 | ||
729 | dns_trust_anchor_remove_revoked(d, anchor); | |
730 | break; | |
731 | } | |
732 | } | |
733 | ||
734 | return 0; | |
735 | } | |
736 | ||
d424da2a LP |
737 | int dns_trust_anchor_check_revoked(DnsTrustAnchor *d, DnsResourceRecord *dnskey, DnsAnswer *rrs) { |
738 | DnsResourceRecord *rrsig; | |
0c857028 LP |
739 | int r; |
740 | ||
741 | assert(d); | |
d424da2a LP |
742 | assert(dnskey); |
743 | ||
744 | /* Looks if "dnskey" is a self-signed RR that has been revoked | |
745 | * and matches one of our trust anchor entries. If so, removes | |
746 | * it from the trust anchor and returns > 0. */ | |
0c857028 | 747 | |
d424da2a LP |
748 | if (dnskey->key->type != DNS_TYPE_DNSKEY) |
749 | return 0; | |
0c857028 | 750 | |
d424da2a LP |
751 | /* Is this DNSKEY revoked? */ |
752 | if ((dnskey->dnskey.flags & DNSKEY_FLAG_REVOKE) == 0) | |
0c857028 LP |
753 | return 0; |
754 | ||
d424da2a LP |
755 | /* Could this be interesting to us at all? If not, |
756 | * there's no point in looking for and verifying a | |
757 | * self-signed RRSIG. */ | |
1c02e7ba | 758 | if (!dns_trust_anchor_knows_domain_positive(d, dns_resource_key_name(dnskey->key))) |
d424da2a LP |
759 | return 0; |
760 | ||
761 | /* Look for a self-signed RRSIG in the other rrs belonging to this DNSKEY */ | |
762 | DNS_ANSWER_FOREACH(rrsig, rrs) { | |
0c857028 LP |
763 | DnssecResult result; |
764 | ||
d424da2a LP |
765 | if (rrsig->key->type != DNS_TYPE_RRSIG) |
766 | continue; | |
767 | ||
768 | r = dnssec_rrsig_match_dnskey(rrsig, dnskey, true); | |
0c857028 LP |
769 | if (r < 0) |
770 | return r; | |
771 | if (r == 0) | |
772 | continue; | |
773 | ||
d424da2a LP |
774 | r = dnssec_verify_rrset(rrs, dnskey->key, rrsig, dnskey, USEC_INFINITY, &result); |
775 | if (r < 0) | |
776 | return r; | |
777 | if (result != DNSSEC_VALIDATED) | |
0c857028 LP |
778 | continue; |
779 | ||
d424da2a LP |
780 | /* Bingo! This is a revoked self-signed DNSKEY. Let's |
781 | * see if this precise one exists in our trust anchor | |
782 | * database, too. */ | |
783 | r = dns_trust_anchor_check_revoked_one(d, dnskey); | |
784 | if (r < 0) | |
785 | return r; | |
0c857028 | 786 | |
d424da2a | 787 | return 1; |
0c857028 LP |
788 | } |
789 | ||
790 | return 0; | |
791 | } | |
c9c72065 LP |
792 | |
793 | int dns_trust_anchor_is_revoked(DnsTrustAnchor *d, DnsResourceRecord *rr) { | |
794 | assert(d); | |
795 | ||
796 | if (!IN_SET(rr->key->type, DNS_TYPE_DS, DNS_TYPE_DNSKEY)) | |
797 | return 0; | |
798 | ||
799 | return set_contains(d->revoked_by_rr, rr); | |
800 | } |