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ec2c5e43 LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2014 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
beef6a5f LP |
22 | #include <sd-messages.h> |
23 | ||
ec2c5e43 | 24 | #include "af-list.h" |
b5efdb8a | 25 | #include "alloc-util.h" |
f52e61da | 26 | #include "dns-domain.h" |
7cc6ed7b | 27 | #include "errno-list.h" |
3ffd4af2 LP |
28 | #include "fd-util.h" |
29 | #include "random-util.h" | |
7778dfff | 30 | #include "resolved-dns-cache.h" |
3ffd4af2 LP |
31 | #include "resolved-dns-transaction.h" |
32 | #include "resolved-llmnr.h" | |
8b43440b | 33 | #include "string-table.h" |
ec2c5e43 | 34 | |
b214dc0f LP |
35 | #define TRANSACTIONS_MAX 4096 |
36 | ||
c61d2b44 LP |
37 | static void dns_transaction_reset_answer(DnsTransaction *t) { |
38 | assert(t); | |
39 | ||
40 | t->received = dns_packet_unref(t->received); | |
41 | t->answer = dns_answer_unref(t->answer); | |
42 | t->answer_rcode = 0; | |
43 | t->answer_dnssec_result = _DNSSEC_RESULT_INVALID; | |
44 | t->answer_source = _DNS_TRANSACTION_SOURCE_INVALID; | |
45 | t->answer_authenticated = false; | |
d3760be0 | 46 | t->answer_nsec_ttl = (uint32_t) -1; |
7cc6ed7b | 47 | t->answer_errno = 0; |
c61d2b44 LP |
48 | } |
49 | ||
c5b4f861 LP |
50 | static void dns_transaction_flush_dnssec_transactions(DnsTransaction *t) { |
51 | DnsTransaction *z; | |
52 | ||
53 | assert(t); | |
54 | ||
55 | while ((z = set_steal_first(t->dnssec_transactions))) { | |
56 | set_remove(z->notify_transactions, t); | |
57 | dns_transaction_gc(z); | |
58 | } | |
59 | } | |
60 | ||
f32f0e57 LP |
61 | static void dns_transaction_close_connection(DnsTransaction *t) { |
62 | assert(t); | |
63 | ||
64 | t->stream = dns_stream_free(t->stream); | |
65 | t->dns_udp_event_source = sd_event_source_unref(t->dns_udp_event_source); | |
66 | t->dns_udp_fd = safe_close(t->dns_udp_fd); | |
67 | } | |
68 | ||
f535705a | 69 | static void dns_transaction_stop_timeout(DnsTransaction *t) { |
97cc656c LP |
70 | assert(t); |
71 | ||
72 | t->timeout_event_source = sd_event_source_unref(t->timeout_event_source); | |
97cc656c LP |
73 | } |
74 | ||
ec2c5e43 | 75 | DnsTransaction* dns_transaction_free(DnsTransaction *t) { |
801ad6a6 | 76 | DnsQueryCandidate *c; |
ec2c5e43 | 77 | DnsZoneItem *i; |
547973de | 78 | DnsTransaction *z; |
ec2c5e43 LP |
79 | |
80 | if (!t) | |
81 | return NULL; | |
82 | ||
51e399bc LP |
83 | log_debug("Freeing transaction %" PRIu16 ".", t->id); |
84 | ||
f32f0e57 | 85 | dns_transaction_close_connection(t); |
f535705a | 86 | dns_transaction_stop_timeout(t); |
ec2c5e43 | 87 | |
ec2c5e43 | 88 | dns_packet_unref(t->sent); |
c61d2b44 | 89 | dns_transaction_reset_answer(t); |
ec2c5e43 | 90 | |
8300ba21 | 91 | dns_server_unref(t->server); |
ec2c5e43 LP |
92 | |
93 | if (t->scope) { | |
f9ebb22a LP |
94 | hashmap_remove_value(t->scope->transactions_by_key, t->key, t); |
95 | LIST_REMOVE(transactions_by_scope, t->scope->transactions, t); | |
ec2c5e43 LP |
96 | |
97 | if (t->id != 0) | |
98 | hashmap_remove(t->scope->manager->dns_transactions, UINT_TO_PTR(t->id)); | |
99 | } | |
100 | ||
547973de | 101 | while ((c = set_steal_first(t->notify_query_candidates))) |
801ad6a6 | 102 | set_remove(c->transactions, t); |
547973de | 103 | set_free(t->notify_query_candidates); |
801ad6a6 | 104 | |
547973de | 105 | while ((i = set_steal_first(t->notify_zone_items))) |
ec2c5e43 | 106 | i->probe_transaction = NULL; |
547973de LP |
107 | set_free(t->notify_zone_items); |
108 | ||
109 | while ((z = set_steal_first(t->notify_transactions))) | |
110 | set_remove(z->dnssec_transactions, t); | |
111 | set_free(t->notify_transactions); | |
112 | ||
c5b4f861 | 113 | dns_transaction_flush_dnssec_transactions(t); |
547973de LP |
114 | set_free(t->dnssec_transactions); |
115 | ||
116 | dns_answer_unref(t->validated_keys); | |
97cc656c | 117 | dns_resource_key_unref(t->key); |
a5784c49 | 118 | free(t->key_string); |
97cc656c | 119 | |
ec2c5e43 LP |
120 | free(t); |
121 | return NULL; | |
122 | } | |
123 | ||
124 | DEFINE_TRIVIAL_CLEANUP_FUNC(DnsTransaction*, dns_transaction_free); | |
125 | ||
51e399bc | 126 | bool dns_transaction_gc(DnsTransaction *t) { |
ec2c5e43 LP |
127 | assert(t); |
128 | ||
129 | if (t->block_gc > 0) | |
51e399bc | 130 | return true; |
ec2c5e43 | 131 | |
547973de LP |
132 | if (set_isempty(t->notify_query_candidates) && |
133 | set_isempty(t->notify_zone_items) && | |
51e399bc | 134 | set_isempty(t->notify_transactions)) { |
ec2c5e43 | 135 | dns_transaction_free(t); |
51e399bc LP |
136 | return false; |
137 | } | |
138 | ||
139 | return true; | |
ec2c5e43 LP |
140 | } |
141 | ||
4dd15077 LP |
142 | static uint16_t pick_new_id(Manager *m) { |
143 | uint16_t new_id; | |
144 | ||
145 | /* Find a fresh, unused transaction id. Note that this loop is bounded because there's a limit on the number of | |
146 | * transactions, and it's much lower than the space of IDs. */ | |
147 | ||
148 | assert_cc(TRANSACTIONS_MAX < 0xFFFF); | |
149 | ||
150 | do | |
151 | random_bytes(&new_id, sizeof(new_id)); | |
152 | while (new_id == 0 || | |
153 | hashmap_get(m->dns_transactions, UINT_TO_PTR(new_id))); | |
154 | ||
155 | return new_id; | |
156 | } | |
157 | ||
f52e61da | 158 | int dns_transaction_new(DnsTransaction **ret, DnsScope *s, DnsResourceKey *key) { |
ec2c5e43 LP |
159 | _cleanup_(dns_transaction_freep) DnsTransaction *t = NULL; |
160 | int r; | |
161 | ||
162 | assert(ret); | |
163 | assert(s); | |
f52e61da | 164 | assert(key); |
ec2c5e43 | 165 | |
9eae2bf3 | 166 | /* Don't allow looking up invalid or pseudo RRs */ |
c463eb78 | 167 | if (!dns_type_is_valid_query(key->type)) |
9eae2bf3 | 168 | return -EINVAL; |
d0129ddb LP |
169 | if (dns_type_is_obsolete(key->type)) |
170 | return -EOPNOTSUPP; | |
9eae2bf3 LP |
171 | |
172 | /* We only support the IN class */ | |
c463eb78 | 173 | if (key->class != DNS_CLASS_IN && key->class != DNS_CLASS_ANY) |
9eae2bf3 LP |
174 | return -EOPNOTSUPP; |
175 | ||
b214dc0f LP |
176 | if (hashmap_size(s->manager->dns_transactions) >= TRANSACTIONS_MAX) |
177 | return -EBUSY; | |
178 | ||
d5099efc | 179 | r = hashmap_ensure_allocated(&s->manager->dns_transactions, NULL); |
ec2c5e43 LP |
180 | if (r < 0) |
181 | return r; | |
182 | ||
f9ebb22a | 183 | r = hashmap_ensure_allocated(&s->transactions_by_key, &dns_resource_key_hash_ops); |
da0c630e LP |
184 | if (r < 0) |
185 | return r; | |
186 | ||
ec2c5e43 LP |
187 | t = new0(DnsTransaction, 1); |
188 | if (!t) | |
189 | return -ENOMEM; | |
190 | ||
4667e00a | 191 | t->dns_udp_fd = -1; |
c3bc53e6 | 192 | t->answer_source = _DNS_TRANSACTION_SOURCE_INVALID; |
019036a4 | 193 | t->answer_dnssec_result = _DNSSEC_RESULT_INVALID; |
d3760be0 | 194 | t->answer_nsec_ttl = (uint32_t) -1; |
f52e61da | 195 | t->key = dns_resource_key_ref(key); |
274b8748 | 196 | t->current_feature_level = _DNS_SERVER_FEATURE_LEVEL_INVALID; |
ec2c5e43 | 197 | |
4dd15077 | 198 | t->id = pick_new_id(s->manager); |
ec2c5e43 LP |
199 | |
200 | r = hashmap_put(s->manager->dns_transactions, UINT_TO_PTR(t->id), t); | |
201 | if (r < 0) { | |
202 | t->id = 0; | |
203 | return r; | |
204 | } | |
205 | ||
f9ebb22a | 206 | r = hashmap_replace(s->transactions_by_key, t->key, t); |
da0c630e LP |
207 | if (r < 0) { |
208 | hashmap_remove(s->manager->dns_transactions, UINT_TO_PTR(t->id)); | |
209 | return r; | |
210 | } | |
211 | ||
f9ebb22a | 212 | LIST_PREPEND(transactions_by_scope, s->transactions, t); |
ec2c5e43 LP |
213 | t->scope = s; |
214 | ||
a150ff5e LP |
215 | s->manager->n_transactions_total ++; |
216 | ||
ec2c5e43 LP |
217 | if (ret) |
218 | *ret = t; | |
219 | ||
220 | t = NULL; | |
221 | ||
222 | return 0; | |
223 | } | |
224 | ||
4dd15077 LP |
225 | static void dns_transaction_shuffle_id(DnsTransaction *t) { |
226 | uint16_t new_id; | |
227 | assert(t); | |
228 | ||
229 | /* Pick a new ID for this transaction. */ | |
230 | ||
231 | new_id = pick_new_id(t->scope->manager); | |
232 | assert_se(hashmap_remove_and_put(t->scope->manager->dns_transactions, UINT_TO_PTR(t->id), UINT_TO_PTR(new_id), t) >= 0); | |
233 | ||
234 | log_debug("Transaction %" PRIu16 " is now %" PRIu16 ".", t->id, new_id); | |
235 | t->id = new_id; | |
236 | ||
237 | /* Make sure we generate a new packet with the new ID */ | |
238 | t->sent = dns_packet_unref(t->sent); | |
239 | } | |
240 | ||
ec2c5e43 | 241 | static void dns_transaction_tentative(DnsTransaction *t, DnsPacket *p) { |
2fb3034c | 242 | _cleanup_free_ char *pretty = NULL; |
ec2c5e43 | 243 | DnsZoneItem *z; |
ec2c5e43 LP |
244 | |
245 | assert(t); | |
246 | assert(p); | |
247 | ||
248 | if (manager_our_packet(t->scope->manager, p) != 0) | |
249 | return; | |
250 | ||
2fb3034c LP |
251 | in_addr_to_string(p->family, &p->sender, &pretty); |
252 | ||
a5784c49 LP |
253 | log_debug("Transaction %" PRIu16 " for <%s> on scope %s on %s/%s got tentative packet from %s.", |
254 | t->id, | |
255 | dns_transaction_key_string(t), | |
ec2c5e43 LP |
256 | dns_protocol_to_string(t->scope->protocol), |
257 | t->scope->link ? t->scope->link->name : "*", | |
2fb3034c LP |
258 | t->scope->family == AF_UNSPEC ? "*" : af_to_name(t->scope->family), |
259 | pretty); | |
ec2c5e43 | 260 | |
a4076574 LP |
261 | /* RFC 4795, Section 4.1 says that the peer with the |
262 | * lexicographically smaller IP address loses */ | |
4d91eec4 LP |
263 | if (memcmp(&p->sender, &p->destination, FAMILY_ADDRESS_SIZE(p->family)) >= 0) { |
264 | log_debug("Peer has lexicographically larger IP address and thus lost in the conflict."); | |
a4076574 LP |
265 | return; |
266 | } | |
267 | ||
4d91eec4 | 268 | log_debug("We have the lexicographically larger IP address and thus lost in the conflict."); |
a4076574 | 269 | |
ec2c5e43 | 270 | t->block_gc++; |
547973de | 271 | while ((z = set_first(t->notify_zone_items))) { |
3ef64445 LP |
272 | /* First, make sure the zone item drops the reference |
273 | * to us */ | |
274 | dns_zone_item_probe_stop(z); | |
275 | ||
276 | /* Secondly, report this as conflict, so that we might | |
277 | * look for a different hostname */ | |
ec2c5e43 | 278 | dns_zone_item_conflict(z); |
3ef64445 | 279 | } |
ec2c5e43 LP |
280 | t->block_gc--; |
281 | ||
282 | dns_transaction_gc(t); | |
283 | } | |
284 | ||
285 | void dns_transaction_complete(DnsTransaction *t, DnsTransactionState state) { | |
801ad6a6 | 286 | DnsQueryCandidate *c; |
ec2c5e43 | 287 | DnsZoneItem *z; |
547973de | 288 | DnsTransaction *d; |
ec2c5e43 | 289 | Iterator i; |
7cc6ed7b | 290 | const char *st; |
ec2c5e43 LP |
291 | |
292 | assert(t); | |
547973de | 293 | assert(!DNS_TRANSACTION_IS_LIVE(state)); |
e56187ca | 294 | |
f61dfddb LP |
295 | if (state == DNS_TRANSACTION_DNSSEC_FAILED) |
296 | log_struct(LOG_NOTICE, | |
beef6a5f | 297 | LOG_MESSAGE_ID(SD_MESSAGE_DNSSEC_FAILURE), |
f61dfddb LP |
298 | LOG_MESSAGE("DNSSEC validation failed for question %s: %s", dns_transaction_key_string(t), dnssec_result_to_string(t->answer_dnssec_result)), |
299 | "DNS_TRANSACTION=%" PRIu16, t->id, | |
300 | "DNS_QUESTION=%s", dns_transaction_key_string(t), | |
301 | "DNSSEC_RESULT=%s", dnssec_result_to_string(t->answer_dnssec_result), | |
1e02e182 LP |
302 | "DNS_SERVER=%s", dns_server_string(t->server), |
303 | "DNS_SERVER_FEATURE_LEVEL=%s", dns_server_feature_level_to_string(t->server->possible_feature_level), | |
f61dfddb LP |
304 | NULL); |
305 | ||
ec2c5e43 LP |
306 | /* Note that this call might invalidate the query. Callers |
307 | * should hence not attempt to access the query or transaction | |
308 | * after calling this function. */ | |
309 | ||
7cc6ed7b LP |
310 | if (state == DNS_TRANSACTION_ERRNO) |
311 | st = errno_to_name(t->answer_errno); | |
312 | else | |
313 | st = dns_transaction_state_to_string(state); | |
314 | ||
a5784c49 LP |
315 | log_debug("Transaction %" PRIu16 " for <%s> on scope %s on %s/%s now complete with <%s> from %s (%s).", |
316 | t->id, | |
317 | dns_transaction_key_string(t), | |
ec2c5e43 LP |
318 | dns_protocol_to_string(t->scope->protocol), |
319 | t->scope->link ? t->scope->link->name : "*", | |
320 | t->scope->family == AF_UNSPEC ? "*" : af_to_name(t->scope->family), | |
7cc6ed7b | 321 | st, |
a5784c49 LP |
322 | t->answer_source < 0 ? "none" : dns_transaction_source_to_string(t->answer_source), |
323 | t->answer_authenticated ? "authenticated" : "unsigned"); | |
ec2c5e43 LP |
324 | |
325 | t->state = state; | |
326 | ||
f32f0e57 | 327 | dns_transaction_close_connection(t); |
f535705a | 328 | dns_transaction_stop_timeout(t); |
ec2c5e43 LP |
329 | |
330 | /* Notify all queries that are interested, but make sure the | |
331 | * transaction isn't freed while we are still looking at it */ | |
332 | t->block_gc++; | |
f7014757 | 333 | |
547973de LP |
334 | SET_FOREACH(c, t->notify_query_candidates, i) |
335 | dns_query_candidate_notify(c); | |
336 | SET_FOREACH(z, t->notify_zone_items, i) | |
337 | dns_zone_item_notify(z); | |
ec2c5e43 | 338 | |
f7014757 LP |
339 | if (!set_isempty(t->notify_transactions)) { |
340 | DnsTransaction **nt; | |
341 | unsigned j, n = 0; | |
342 | ||
343 | /* We need to be careful when notifying other | |
344 | * transactions, as that might destroy other | |
345 | * transactions in our list. Hence, in order to be | |
346 | * able to safely iterate through the list of | |
347 | * transactions, take a GC lock on all of them | |
348 | * first. Then, in a second loop, notify them, but | |
349 | * first unlock that specific transaction. */ | |
350 | ||
351 | nt = newa(DnsTransaction*, set_size(t->notify_transactions)); | |
352 | SET_FOREACH(d, t->notify_transactions, i) { | |
353 | nt[n++] = d; | |
354 | d->block_gc++; | |
355 | } | |
356 | ||
357 | assert(n == set_size(t->notify_transactions)); | |
358 | ||
359 | for (j = 0; j < n; j++) { | |
360 | if (set_contains(t->notify_transactions, nt[j])) | |
361 | dns_transaction_notify(nt[j], t); | |
362 | ||
363 | nt[j]->block_gc--; | |
364 | dns_transaction_gc(nt[j]); | |
365 | } | |
366 | } | |
367 | ||
368 | t->block_gc--; | |
ec2c5e43 LP |
369 | dns_transaction_gc(t); |
370 | } | |
371 | ||
519ef046 LP |
372 | static int dns_transaction_pick_server(DnsTransaction *t) { |
373 | DnsServer *server; | |
374 | ||
375 | assert(t); | |
376 | assert(t->scope->protocol == DNS_PROTOCOL_DNS); | |
377 | ||
378 | server = dns_scope_get_dns_server(t->scope); | |
379 | if (!server) | |
380 | return -ESRCH; | |
381 | ||
274b8748 | 382 | t->current_feature_level = dns_server_possible_feature_level(server); |
519ef046 LP |
383 | |
384 | if (server == t->server) | |
385 | return 0; | |
386 | ||
387 | dns_server_unref(t->server); | |
388 | t->server = dns_server_ref(server); | |
389 | ||
390 | return 1; | |
391 | } | |
392 | ||
8d10d620 LP |
393 | static void dns_transaction_retry(DnsTransaction *t) { |
394 | int r; | |
395 | ||
396 | assert(t); | |
397 | ||
398 | log_debug("Retrying transaction %" PRIu16 ".", t->id); | |
399 | ||
400 | /* Before we try again, switch to a new server. */ | |
401 | dns_scope_next_dns_server(t->scope); | |
402 | ||
403 | r = dns_transaction_go(t); | |
7cc6ed7b LP |
404 | if (r < 0) { |
405 | t->answer_errno = -r; | |
406 | dns_transaction_complete(t, DNS_TRANSACTION_ERRNO); | |
407 | } | |
8d10d620 LP |
408 | } |
409 | ||
c02cf2f4 LP |
410 | static int dns_transaction_maybe_restart(DnsTransaction *t) { |
411 | assert(t); | |
412 | ||
413 | if (!t->server) | |
414 | return 0; | |
415 | ||
416 | if (t->current_feature_level <= dns_server_possible_feature_level(t->server)) | |
417 | return 0; | |
418 | ||
419 | /* The server's current feature level is lower than when we sent the original query. We learnt something from | |
420 | the response or possibly an auxiliary DNSSEC response that we didn't know before. We take that as reason to | |
421 | restart the whole transaction. This is a good idea to deal with servers that respond rubbish if we include | |
422 | OPT RR or DO bit. One of these cases is documented here, for example: | |
423 | https://open.nlnetlabs.nl/pipermail/dnssec-trigger/2014-November/000376.html */ | |
424 | ||
4dd15077 LP |
425 | log_debug("Server feature level is now lower than when we began our transaction. Restarting with new ID."); |
426 | dns_transaction_shuffle_id(t); | |
c02cf2f4 LP |
427 | return dns_transaction_go(t); |
428 | } | |
429 | ||
ec2c5e43 LP |
430 | static int on_stream_complete(DnsStream *s, int error) { |
431 | _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL; | |
432 | DnsTransaction *t; | |
433 | ||
434 | assert(s); | |
435 | assert(s->transaction); | |
436 | ||
437 | /* Copy the data we care about out of the stream before we | |
438 | * destroy it. */ | |
439 | t = s->transaction; | |
440 | p = dns_packet_ref(s->read_packet); | |
441 | ||
442 | t->stream = dns_stream_free(t->stream); | |
443 | ||
a1a3f73a LP |
444 | if (ERRNO_IS_DISCONNECT(error)) { |
445 | usec_t usec; | |
446 | ||
0791110f LP |
447 | if (t->scope->protocol == DNS_PROTOCOL_LLMNR) { |
448 | /* If the LLMNR/TCP connection failed, the host doesn't support LLMNR, and we cannot answer the | |
449 | * question on this scope. */ | |
450 | dns_transaction_complete(t, DNS_TRANSACTION_NOT_FOUND); | |
451 | return 0; | |
452 | } | |
453 | ||
92ec902a | 454 | log_debug_errno(error, "Connection failure for DNS TCP stream: %m"); |
a1a3f73a | 455 | assert_se(sd_event_now(t->scope->manager->event, clock_boottime_or_monotonic(), &usec) >= 0); |
274b8748 | 456 | dns_server_packet_lost(t->server, IPPROTO_TCP, t->current_feature_level, usec - t->start_usec); |
a1a3f73a LP |
457 | |
458 | dns_transaction_retry(t); | |
ac720200 LP |
459 | return 0; |
460 | } | |
ec2c5e43 | 461 | if (error != 0) { |
7cc6ed7b LP |
462 | t->answer_errno = error; |
463 | dns_transaction_complete(t, DNS_TRANSACTION_ERRNO); | |
ec2c5e43 LP |
464 | return 0; |
465 | } | |
466 | ||
a4076574 | 467 | if (dns_packet_validate_reply(p) <= 0) { |
a20b9592 | 468 | log_debug("Invalid TCP reply packet."); |
a4076574 LP |
469 | dns_transaction_complete(t, DNS_TRANSACTION_INVALID_REPLY); |
470 | return 0; | |
471 | } | |
472 | ||
473 | dns_scope_check_conflicts(t->scope, p); | |
474 | ||
ec2c5e43 LP |
475 | t->block_gc++; |
476 | dns_transaction_process_reply(t, p); | |
477 | t->block_gc--; | |
478 | ||
519ef046 LP |
479 | /* If the response wasn't useful, then complete the transition |
480 | * now. After all, we are the worst feature set now with TCP | |
481 | * sockets, and there's really no point in retrying. */ | |
ec2c5e43 LP |
482 | if (t->state == DNS_TRANSACTION_PENDING) |
483 | dns_transaction_complete(t, DNS_TRANSACTION_INVALID_REPLY); | |
598f44bd LP |
484 | else |
485 | dns_transaction_gc(t); | |
ec2c5e43 LP |
486 | |
487 | return 0; | |
488 | } | |
489 | ||
490 | static int dns_transaction_open_tcp(DnsTransaction *t) { | |
491 | _cleanup_close_ int fd = -1; | |
492 | int r; | |
493 | ||
494 | assert(t); | |
495 | ||
519ef046 | 496 | dns_transaction_close_connection(t); |
ec2c5e43 | 497 | |
106784eb | 498 | switch (t->scope->protocol) { |
519ef046 | 499 | |
106784eb | 500 | case DNS_PROTOCOL_DNS: |
519ef046 LP |
501 | r = dns_transaction_pick_server(t); |
502 | if (r < 0) | |
503 | return r; | |
504 | ||
92ec902a | 505 | if (!dns_server_dnssec_supported(t->server) && dns_type_is_dnssec(t->key->type)) |
91adc4db LP |
506 | return -EOPNOTSUPP; |
507 | ||
274b8748 | 508 | r = dns_server_adjust_opt(t->server, t->sent, t->current_feature_level); |
519ef046 LP |
509 | if (r < 0) |
510 | return r; | |
511 | ||
512 | fd = dns_scope_socket_tcp(t->scope, AF_UNSPEC, NULL, t->server, 53); | |
106784eb | 513 | break; |
ec2c5e43 | 514 | |
106784eb | 515 | case DNS_PROTOCOL_LLMNR: |
a8f6397f | 516 | /* When we already received a reply to this (but it was truncated), send to its sender address */ |
ec2c5e43 | 517 | if (t->received) |
519ef046 | 518 | fd = dns_scope_socket_tcp(t->scope, t->received->family, &t->received->sender, NULL, t->received->sender_port); |
ec2c5e43 LP |
519 | else { |
520 | union in_addr_union address; | |
a7f7d1bd | 521 | int family = AF_UNSPEC; |
ec2c5e43 LP |
522 | |
523 | /* Otherwise, try to talk to the owner of a | |
524 | * the IP address, in case this is a reverse | |
525 | * PTR lookup */ | |
f52e61da LP |
526 | |
527 | r = dns_name_address(DNS_RESOURCE_KEY_NAME(t->key), &family, &address); | |
ec2c5e43 LP |
528 | if (r < 0) |
529 | return r; | |
530 | if (r == 0) | |
531 | return -EINVAL; | |
9e08a6e0 | 532 | if (family != t->scope->family) |
9318cdd3 | 533 | return -ESRCH; |
ec2c5e43 | 534 | |
519ef046 | 535 | fd = dns_scope_socket_tcp(t->scope, family, &address, NULL, LLMNR_PORT); |
ec2c5e43 | 536 | } |
106784eb DM |
537 | |
538 | break; | |
539 | ||
540 | default: | |
ec2c5e43 | 541 | return -EAFNOSUPPORT; |
106784eb | 542 | } |
ec2c5e43 LP |
543 | |
544 | if (fd < 0) | |
545 | return fd; | |
546 | ||
547 | r = dns_stream_new(t->scope->manager, &t->stream, t->scope->protocol, fd); | |
548 | if (r < 0) | |
549 | return r; | |
ec2c5e43 LP |
550 | fd = -1; |
551 | ||
552 | r = dns_stream_write_packet(t->stream, t->sent); | |
553 | if (r < 0) { | |
554 | t->stream = dns_stream_free(t->stream); | |
555 | return r; | |
556 | } | |
557 | ||
ec2c5e43 LP |
558 | t->stream->complete = on_stream_complete; |
559 | t->stream->transaction = t; | |
560 | ||
561 | /* The interface index is difficult to determine if we are | |
562 | * connecting to the local host, hence fill this in right away | |
563 | * instead of determining it from the socket */ | |
564 | if (t->scope->link) | |
565 | t->stream->ifindex = t->scope->link->ifindex; | |
566 | ||
519ef046 LP |
567 | dns_transaction_reset_answer(t); |
568 | ||
cbe4216d LP |
569 | t->tried_stream = true; |
570 | ||
ec2c5e43 LP |
571 | return 0; |
572 | } | |
573 | ||
547973de | 574 | static void dns_transaction_cache_answer(DnsTransaction *t) { |
547973de LP |
575 | assert(t); |
576 | ||
577 | /* For mDNS we cache whenever we get the packet, rather than | |
578 | * in each transaction. */ | |
579 | if (!IN_SET(t->scope->protocol, DNS_PROTOCOL_DNS, DNS_PROTOCOL_LLMNR)) | |
580 | return; | |
581 | ||
582 | /* We never cache if this packet is from the local host, under | |
583 | * the assumption that a locally running DNS server would | |
584 | * cache this anyway, and probably knows better when to flush | |
585 | * the cache then we could. */ | |
586 | if (!DNS_PACKET_SHALL_CACHE(t->received)) | |
587 | return; | |
588 | ||
547973de LP |
589 | dns_cache_put(&t->scope->cache, |
590 | t->key, | |
591 | t->answer_rcode, | |
592 | t->answer, | |
547973de | 593 | t->answer_authenticated, |
d3760be0 | 594 | t->answer_nsec_ttl, |
547973de LP |
595 | 0, |
596 | t->received->family, | |
597 | &t->received->sender); | |
598 | } | |
599 | ||
105e1512 LP |
600 | static bool dns_transaction_dnssec_is_live(DnsTransaction *t) { |
601 | DnsTransaction *dt; | |
602 | Iterator i; | |
603 | ||
604 | assert(t); | |
605 | ||
606 | SET_FOREACH(dt, t->dnssec_transactions, i) | |
607 | if (DNS_TRANSACTION_IS_LIVE(dt->state)) | |
608 | return true; | |
609 | ||
610 | return false; | |
611 | } | |
612 | ||
942eb2e7 LP |
613 | static int dns_transaction_dnssec_ready(DnsTransaction *t) { |
614 | DnsTransaction *dt; | |
615 | Iterator i; | |
616 | ||
617 | assert(t); | |
618 | ||
619 | /* Checks whether the auxiliary DNSSEC transactions of our transaction have completed, or are still | |
620 | * ongoing. Returns 0, if we aren't ready for the DNSSEC validation, positive if we are. */ | |
621 | ||
622 | SET_FOREACH(dt, t->dnssec_transactions, i) { | |
623 | ||
624 | switch (dt->state) { | |
625 | ||
626 | case DNS_TRANSACTION_NULL: | |
627 | case DNS_TRANSACTION_PENDING: | |
628 | case DNS_TRANSACTION_VALIDATING: | |
629 | /* Still ongoing */ | |
630 | return 0; | |
631 | ||
632 | case DNS_TRANSACTION_RCODE_FAILURE: | |
633 | if (dt->answer_rcode != DNS_RCODE_NXDOMAIN) { | |
634 | log_debug("Auxiliary DNSSEC RR query failed with rcode=%s.", dns_rcode_to_string(dt->answer_rcode)); | |
635 | goto fail; | |
636 | } | |
637 | ||
638 | /* Fall-through: NXDOMAIN is good enough for us. This is because some DNS servers erronously | |
639 | * return NXDOMAIN for empty non-terminals (Akamai...), and we need to handle that nicely, when | |
640 | * asking for parent SOA or similar RRs to make unsigned proofs. */ | |
641 | ||
642 | case DNS_TRANSACTION_SUCCESS: | |
643 | /* All good. */ | |
644 | break; | |
645 | ||
646 | case DNS_TRANSACTION_DNSSEC_FAILED: | |
647 | /* We handle DNSSEC failures different from other errors, as we care about the DNSSEC | |
648 | * validationr result */ | |
649 | ||
650 | log_debug("Auxiliary DNSSEC RR query failed validation: %s", dnssec_result_to_string(dt->answer_dnssec_result)); | |
651 | t->answer_dnssec_result = dt->answer_dnssec_result; /* Copy error code over */ | |
652 | dns_transaction_complete(t, DNS_TRANSACTION_DNSSEC_FAILED); | |
653 | return 0; | |
654 | ||
655 | ||
656 | default: | |
657 | log_debug("Auxiliary DNSSEC RR query failed with %s", dns_transaction_state_to_string(dt->state)); | |
658 | goto fail; | |
659 | } | |
660 | } | |
661 | ||
662 | /* All is ready, we can go and validate */ | |
663 | return 1; | |
664 | ||
665 | fail: | |
666 | t->answer_dnssec_result = DNSSEC_FAILED_AUXILIARY; | |
667 | dns_transaction_complete(t, DNS_TRANSACTION_DNSSEC_FAILED); | |
668 | return 0; | |
669 | } | |
670 | ||
547973de LP |
671 | static void dns_transaction_process_dnssec(DnsTransaction *t) { |
672 | int r; | |
673 | ||
674 | assert(t); | |
675 | ||
676 | /* Are there ongoing DNSSEC transactions? If so, let's wait for them. */ | |
942eb2e7 | 677 | r = dns_transaction_dnssec_ready(t); |
7cc6ed7b LP |
678 | if (r < 0) |
679 | goto fail; | |
942eb2e7 | 680 | if (r == 0) /* We aren't ready yet (or one of our auxiliary transactions failed, and we shouldn't validate now */ |
547973de LP |
681 | return; |
682 | ||
c02cf2f4 LP |
683 | /* See if we learnt things from the additional DNSSEC transactions, that we didn't know before, and better |
684 | * restart the lookup immediately. */ | |
685 | r = dns_transaction_maybe_restart(t); | |
7cc6ed7b LP |
686 | if (r < 0) |
687 | goto fail; | |
c02cf2f4 LP |
688 | if (r > 0) /* Transaction got restarted... */ |
689 | return; | |
690 | ||
547973de LP |
691 | /* All our auxiliary DNSSEC transactions are complete now. Try |
692 | * to validate our RRset now. */ | |
693 | r = dns_transaction_validate_dnssec(t); | |
fcfaff12 LP |
694 | if (r == -EBADMSG) { |
695 | dns_transaction_complete(t, DNS_TRANSACTION_INVALID_REPLY); | |
696 | return; | |
697 | } | |
7cc6ed7b LP |
698 | if (r < 0) |
699 | goto fail; | |
547973de | 700 | |
b652d4a2 LP |
701 | if (t->answer_dnssec_result == DNSSEC_INCOMPATIBLE_SERVER && |
702 | t->scope->dnssec_mode == DNSSEC_YES) { | |
703 | /* We are not in automatic downgrade mode, and the | |
704 | * server is bad, refuse operation. */ | |
705 | dns_transaction_complete(t, DNS_TRANSACTION_DNSSEC_FAILED); | |
706 | return; | |
707 | } | |
708 | ||
019036a4 | 709 | if (!IN_SET(t->answer_dnssec_result, |
b652d4a2 LP |
710 | _DNSSEC_RESULT_INVALID, /* No DNSSEC validation enabled */ |
711 | DNSSEC_VALIDATED, /* Answer is signed and validated successfully */ | |
712 | DNSSEC_UNSIGNED, /* Answer is right-fully unsigned */ | |
713 | DNSSEC_INCOMPATIBLE_SERVER)) { /* Server does not do DNSSEC (Yay, we are downgrade attack vulnerable!) */ | |
547973de LP |
714 | dns_transaction_complete(t, DNS_TRANSACTION_DNSSEC_FAILED); |
715 | return; | |
716 | } | |
717 | ||
1e02e182 LP |
718 | if (t->answer_dnssec_result == DNSSEC_INCOMPATIBLE_SERVER) |
719 | dns_server_warn_downgrade(t->server); | |
720 | ||
547973de LP |
721 | dns_transaction_cache_answer(t); |
722 | ||
723 | if (t->answer_rcode == DNS_RCODE_SUCCESS) | |
724 | dns_transaction_complete(t, DNS_TRANSACTION_SUCCESS); | |
725 | else | |
3bbdc31d | 726 | dns_transaction_complete(t, DNS_TRANSACTION_RCODE_FAILURE); |
7cc6ed7b LP |
727 | |
728 | return; | |
729 | ||
730 | fail: | |
731 | t->answer_errno = -r; | |
732 | dns_transaction_complete(t, DNS_TRANSACTION_ERRNO); | |
547973de LP |
733 | } |
734 | ||
eac7cda2 LP |
735 | static int dns_transaction_has_positive_answer(DnsTransaction *t, DnsAnswerFlags *flags) { |
736 | int r; | |
737 | ||
738 | assert(t); | |
739 | ||
740 | /* Checks whether the answer is positive, i.e. either a direct | |
741 | * answer to the question, or a CNAME/DNAME for it */ | |
742 | ||
743 | r = dns_answer_match_key(t->answer, t->key, flags); | |
744 | if (r != 0) | |
745 | return r; | |
746 | ||
747 | r = dns_answer_find_cname_or_dname(t->answer, t->key, NULL, flags); | |
748 | if (r != 0) | |
749 | return r; | |
750 | ||
751 | return false; | |
752 | } | |
753 | ||
754 | static int dns_transaction_fix_rcode(DnsTransaction *t) { | |
755 | int r; | |
756 | ||
757 | assert(t); | |
758 | ||
759 | /* Fix up the RCODE to SUCCESS if we get at least one matching RR in a response. Note that this contradicts the | |
760 | * DNS RFCs a bit. Specifically, RFC 6604 Section 3 clarifies that the RCODE shall say something about a | |
761 | * CNAME/DNAME chain element coming after the last chain element contained in the message, and not the first | |
762 | * one included. However, it also indicates that not all DNS servers implement this correctly. Moreover, when | |
763 | * using DNSSEC we usually only can prove the first element of a CNAME/DNAME chain anyway, hence let's settle | |
764 | * on always processing the RCODE as referring to the immediate look-up we do, i.e. the first element of a | |
765 | * CNAME/DNAME chain. This way, we uniformly handle CNAME/DNAME chains, regardless if the DNS server | |
766 | * incorrectly implements RCODE, whether DNSSEC is in use, or whether the DNS server only supplied us with an | |
767 | * incomplete CNAME/DNAME chain. | |
768 | * | |
769 | * Or in other words: if we get at least one positive reply in a message we patch NXDOMAIN to become SUCCESS, | |
770 | * and then rely on the CNAME chasing logic to figure out that there's actually a CNAME error with a new | |
771 | * lookup. */ | |
772 | ||
773 | if (t->answer_rcode != DNS_RCODE_NXDOMAIN) | |
774 | return 0; | |
775 | ||
776 | r = dns_transaction_has_positive_answer(t, NULL); | |
777 | if (r <= 0) | |
778 | return r; | |
779 | ||
780 | t->answer_rcode = DNS_RCODE_SUCCESS; | |
781 | return 0; | |
782 | } | |
783 | ||
ec2c5e43 | 784 | void dns_transaction_process_reply(DnsTransaction *t, DnsPacket *p) { |
9df3ba6c | 785 | usec_t ts; |
ec2c5e43 LP |
786 | int r; |
787 | ||
788 | assert(t); | |
789 | assert(p); | |
9df3ba6c TG |
790 | assert(t->scope); |
791 | assert(t->scope->manager); | |
ec2c5e43 | 792 | |
5a7e41a3 LP |
793 | if (t->state != DNS_TRANSACTION_PENDING) |
794 | return; | |
795 | ||
ec2c5e43 LP |
796 | /* Note that this call might invalidate the query. Callers |
797 | * should hence not attempt to access the query or transaction | |
798 | * after calling this function. */ | |
799 | ||
b5efcf29 LP |
800 | log_debug("Processing incoming packet on transaction %" PRIu16".", t->id); |
801 | ||
106784eb | 802 | switch (t->scope->protocol) { |
b5efcf29 | 803 | |
106784eb | 804 | case DNS_PROTOCOL_LLMNR: |
ec2c5e43 LP |
805 | assert(t->scope->link); |
806 | ||
807 | /* For LLMNR we will not accept any packets from other | |
808 | * interfaces */ | |
809 | ||
810 | if (p->ifindex != t->scope->link->ifindex) | |
811 | return; | |
812 | ||
813 | if (p->family != t->scope->family) | |
814 | return; | |
815 | ||
816 | /* Tentative packets are not full responses but still | |
817 | * useful for identifying uniqueness conflicts during | |
818 | * probing. */ | |
8b757a38 | 819 | if (DNS_PACKET_LLMNR_T(p)) { |
ec2c5e43 LP |
820 | dns_transaction_tentative(t, p); |
821 | return; | |
822 | } | |
106784eb DM |
823 | |
824 | break; | |
825 | ||
4e5bf5e1 DM |
826 | case DNS_PROTOCOL_MDNS: |
827 | assert(t->scope->link); | |
828 | ||
829 | /* For mDNS we will not accept any packets from other interfaces */ | |
830 | if (p->ifindex != t->scope->link->ifindex) | |
831 | return; | |
832 | ||
833 | if (p->family != t->scope->family) | |
834 | return; | |
835 | ||
836 | break; | |
837 | ||
106784eb | 838 | case DNS_PROTOCOL_DNS: |
8ad182a1 LP |
839 | /* Note that we do not need to verify the |
840 | * addresses/port numbers of incoming traffic, as we | |
841 | * invoked connect() on our UDP socket in which case | |
842 | * the kernel already does the needed verification for | |
843 | * us. */ | |
106784eb DM |
844 | break; |
845 | ||
846 | default: | |
9c56a6f3 | 847 | assert_not_reached("Invalid DNS protocol."); |
ec2c5e43 LP |
848 | } |
849 | ||
ec2c5e43 LP |
850 | if (t->received != p) { |
851 | dns_packet_unref(t->received); | |
852 | t->received = dns_packet_ref(p); | |
853 | } | |
854 | ||
c3bc53e6 LP |
855 | t->answer_source = DNS_TRANSACTION_NETWORK; |
856 | ||
ec2c5e43 LP |
857 | if (p->ipproto == IPPROTO_TCP) { |
858 | if (DNS_PACKET_TC(p)) { | |
859 | /* Truncated via TCP? Somebody must be fucking with us */ | |
860 | dns_transaction_complete(t, DNS_TRANSACTION_INVALID_REPLY); | |
861 | return; | |
862 | } | |
863 | ||
864 | if (DNS_PACKET_ID(p) != t->id) { | |
865 | /* Not the reply to our query? Somebody must be fucking with us */ | |
866 | dns_transaction_complete(t, DNS_TRANSACTION_INVALID_REPLY); | |
867 | return; | |
868 | } | |
869 | } | |
870 | ||
38a03f06 | 871 | assert_se(sd_event_now(t->scope->manager->event, clock_boottime_or_monotonic(), &ts) >= 0); |
9df3ba6c TG |
872 | |
873 | switch (t->scope->protocol) { | |
8af5b883 | 874 | |
9df3ba6c TG |
875 | case DNS_PROTOCOL_DNS: |
876 | assert(t->server); | |
877 | ||
4e0b8b17 TG |
878 | if (IN_SET(DNS_PACKET_RCODE(p), DNS_RCODE_FORMERR, DNS_RCODE_SERVFAIL, DNS_RCODE_NOTIMP)) { |
879 | ||
8af5b883 | 880 | /* Request failed, immediately try again with reduced features */ |
4e0b8b17 TG |
881 | log_debug("Server returned error: %s", dns_rcode_to_string(DNS_PACKET_RCODE(p))); |
882 | ||
274b8748 | 883 | dns_server_packet_failed(t->server, t->current_feature_level); |
8d10d620 | 884 | dns_transaction_retry(t); |
4e0b8b17 | 885 | return; |
6bb2c085 | 886 | } else if (DNS_PACKET_TC(p)) |
274b8748 | 887 | dns_server_packet_truncated(t->server, t->current_feature_level); |
9df3ba6c TG |
888 | |
889 | break; | |
8af5b883 | 890 | |
9df3ba6c TG |
891 | case DNS_PROTOCOL_LLMNR: |
892 | case DNS_PROTOCOL_MDNS: | |
893 | dns_scope_packet_received(t->scope, ts - t->start_usec); | |
9df3ba6c | 894 | break; |
8af5b883 | 895 | |
9df3ba6c | 896 | default: |
8af5b883 | 897 | assert_not_reached("Invalid DNS protocol."); |
9df3ba6c TG |
898 | } |
899 | ||
ec2c5e43 | 900 | if (DNS_PACKET_TC(p)) { |
547493c5 DM |
901 | |
902 | /* Truncated packets for mDNS are not allowed. Give up immediately. */ | |
903 | if (t->scope->protocol == DNS_PROTOCOL_MDNS) { | |
904 | dns_transaction_complete(t, DNS_TRANSACTION_INVALID_REPLY); | |
905 | return; | |
906 | } | |
907 | ||
f757cd85 LP |
908 | log_debug("Reply truncated, retrying via TCP."); |
909 | ||
ec2c5e43 LP |
910 | /* Response was truncated, let's try again with good old TCP */ |
911 | r = dns_transaction_open_tcp(t); | |
912 | if (r == -ESRCH) { | |
913 | /* No servers found? Damn! */ | |
914 | dns_transaction_complete(t, DNS_TRANSACTION_NO_SERVERS); | |
915 | return; | |
916 | } | |
91adc4db LP |
917 | if (r == -EOPNOTSUPP) { |
918 | /* Tried to ask for DNSSEC RRs, on a server that doesn't do DNSSEC */ | |
919 | dns_transaction_complete(t, DNS_TRANSACTION_RR_TYPE_UNSUPPORTED); | |
920 | return; | |
921 | } | |
ec2c5e43 | 922 | if (r < 0) { |
8af5b883 | 923 | /* On LLMNR, if we cannot connect to the host, |
ec2c5e43 | 924 | * we immediately give up */ |
7cc6ed7b LP |
925 | if (t->scope->protocol != DNS_PROTOCOL_DNS) |
926 | goto fail; | |
ec2c5e43 LP |
927 | |
928 | /* On DNS, couldn't send? Try immediately again, with a new server */ | |
8d10d620 | 929 | dns_transaction_retry(t); |
ec2c5e43 | 930 | } |
2a6658ef LP |
931 | |
932 | return; | |
ec2c5e43 LP |
933 | } |
934 | ||
de54e62b | 935 | /* After the superficial checks, actually parse the message. */ |
ec2c5e43 LP |
936 | r = dns_packet_extract(p); |
937 | if (r < 0) { | |
938 | dns_transaction_complete(t, DNS_TRANSACTION_INVALID_REPLY); | |
939 | return; | |
940 | } | |
941 | ||
de54e62b | 942 | /* Report that the OPT RR was missing */ |
ed9717fc LP |
943 | if (t->server) { |
944 | if (!p->opt) | |
945 | dns_server_packet_bad_opt(t->server, t->current_feature_level); | |
946 | ||
947 | dns_server_packet_received(t->server, p->ipproto, t->current_feature_level, ts - t->start_usec, p->size); | |
948 | } | |
de54e62b | 949 | |
c02cf2f4 LP |
950 | /* See if we know things we didn't know before that indicate we better restart the lookup immediately. */ |
951 | r = dns_transaction_maybe_restart(t); | |
7cc6ed7b LP |
952 | if (r < 0) |
953 | goto fail; | |
c02cf2f4 LP |
954 | if (r > 0) /* Transaction got restarted... */ |
955 | return; | |
956 | ||
b5efcf29 LP |
957 | if (IN_SET(t->scope->protocol, DNS_PROTOCOL_DNS, DNS_PROTOCOL_LLMNR)) { |
958 | ||
547493c5 | 959 | /* Only consider responses with equivalent query section to the request */ |
8af5b883 | 960 | r = dns_packet_is_reply_for(p, t->key); |
7cc6ed7b LP |
961 | if (r < 0) |
962 | goto fail; | |
8af5b883 | 963 | if (r == 0) { |
547493c5 DM |
964 | dns_transaction_complete(t, DNS_TRANSACTION_INVALID_REPLY); |
965 | return; | |
966 | } | |
29815b6c | 967 | |
547493c5 DM |
968 | /* Install the answer as answer to the transaction */ |
969 | dns_answer_unref(t->answer); | |
970 | t->answer = dns_answer_ref(p->answer); | |
971 | t->answer_rcode = DNS_PACKET_RCODE(p); | |
919c2ae0 | 972 | t->answer_dnssec_result = _DNSSEC_RESULT_INVALID; |
105e1512 | 973 | t->answer_authenticated = false; |
79e24931 | 974 | |
eac7cda2 LP |
975 | r = dns_transaction_fix_rcode(t); |
976 | if (r < 0) | |
977 | goto fail; | |
978 | ||
51e399bc LP |
979 | /* Block GC while starting requests for additional DNSSEC RRs */ |
980 | t->block_gc++; | |
547973de | 981 | r = dns_transaction_request_dnssec_keys(t); |
51e399bc LP |
982 | t->block_gc--; |
983 | ||
984 | /* Maybe the transaction is ready for GC'ing now? If so, free it and return. */ | |
985 | if (!dns_transaction_gc(t)) | |
986 | return; | |
987 | ||
988 | /* Requesting additional keys might have resulted in | |
989 | * this transaction to fail, since the auxiliary | |
990 | * request failed for some reason. If so, we are not | |
991 | * in pending state anymore, and we should exit | |
992 | * quickly. */ | |
993 | if (t->state != DNS_TRANSACTION_PENDING) | |
994 | return; | |
7cc6ed7b LP |
995 | if (r < 0) |
996 | goto fail; | |
547973de LP |
997 | if (r > 0) { |
998 | /* There are DNSSEC transactions pending now. Update the state accordingly. */ | |
999 | t->state = DNS_TRANSACTION_VALIDATING; | |
f535705a LP |
1000 | dns_transaction_close_connection(t); |
1001 | dns_transaction_stop_timeout(t); | |
547973de LP |
1002 | return; |
1003 | } | |
547493c5 | 1004 | } |
ec2c5e43 | 1005 | |
547973de | 1006 | dns_transaction_process_dnssec(t); |
7cc6ed7b LP |
1007 | return; |
1008 | ||
1009 | fail: | |
1010 | t->answer_errno = -r; | |
1011 | dns_transaction_complete(t, DNS_TRANSACTION_ERRNO); | |
ec2c5e43 LP |
1012 | } |
1013 | ||
c19ffd9f TG |
1014 | static int on_dns_packet(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
1015 | _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL; | |
1016 | DnsTransaction *t = userdata; | |
1017 | int r; | |
1018 | ||
1019 | assert(t); | |
1020 | assert(t->scope); | |
1021 | ||
1022 | r = manager_recv(t->scope->manager, fd, DNS_PROTOCOL_DNS, &p); | |
7e1851e3 LP |
1023 | if (ERRNO_IS_DISCONNECT(-r)) { |
1024 | usec_t usec; | |
c19ffd9f | 1025 | |
7e1851e3 LP |
1026 | /* UDP connection failure get reported via ICMP and then are possible delivered to us on the next |
1027 | * recvmsg(). Treat this like a lost packet. */ | |
1028 | ||
92ec902a | 1029 | log_debug_errno(r, "Connection failure for DNS UDP packet: %m"); |
7e1851e3 | 1030 | assert_se(sd_event_now(t->scope->manager->event, clock_boottime_or_monotonic(), &usec) >= 0); |
274b8748 | 1031 | dns_server_packet_lost(t->server, IPPROTO_UDP, t->current_feature_level, usec - t->start_usec); |
7e1851e3 LP |
1032 | |
1033 | dns_transaction_retry(t); | |
1034 | return 0; | |
1035 | } | |
1036 | if (r < 0) { | |
7cc6ed7b LP |
1037 | dns_transaction_complete(t, DNS_TRANSACTION_ERRNO); |
1038 | t->answer_errno = -r; | |
7e1851e3 LP |
1039 | return 0; |
1040 | } | |
1041 | ||
1042 | r = dns_packet_validate_reply(p); | |
1043 | if (r < 0) { | |
1044 | log_debug_errno(r, "Received invalid DNS packet as response, ignoring: %m"); | |
1045 | return 0; | |
1046 | } | |
1047 | if (r == 0) { | |
e09f605e | 1048 | log_debug("Received inappropriate DNS packet as response, ignoring."); |
7e1851e3 LP |
1049 | return 0; |
1050 | } | |
1051 | ||
1052 | if (DNS_PACKET_ID(p) != t->id) { | |
e09f605e | 1053 | log_debug("Received packet with incorrect transaction ID, ignoring."); |
7e1851e3 LP |
1054 | return 0; |
1055 | } | |
c19ffd9f | 1056 | |
7e1851e3 | 1057 | dns_transaction_process_reply(t, p); |
c19ffd9f TG |
1058 | return 0; |
1059 | } | |
1060 | ||
49cce12d | 1061 | static int dns_transaction_emit_udp(DnsTransaction *t) { |
c19ffd9f TG |
1062 | int r; |
1063 | ||
1064 | assert(t); | |
c19ffd9f | 1065 | |
519ef046 | 1066 | if (t->scope->protocol == DNS_PROTOCOL_DNS) { |
c19ffd9f | 1067 | |
519ef046 | 1068 | r = dns_transaction_pick_server(t); |
471d40d9 TG |
1069 | if (r < 0) |
1070 | return r; | |
c19ffd9f | 1071 | |
274b8748 | 1072 | if (t->current_feature_level < DNS_SERVER_FEATURE_LEVEL_UDP) |
519ef046 LP |
1073 | return -EAGAIN; |
1074 | ||
92ec902a | 1075 | if (!dns_server_dnssec_supported(t->server) && dns_type_is_dnssec(t->key->type)) |
91adc4db LP |
1076 | return -EOPNOTSUPP; |
1077 | ||
519ef046 LP |
1078 | if (r > 0 || t->dns_udp_fd < 0) { /* Server changed, or no connection yet. */ |
1079 | int fd; | |
1080 | ||
1081 | dns_transaction_close_connection(t); | |
c19ffd9f | 1082 | |
519ef046 LP |
1083 | fd = dns_scope_socket_udp(t->scope, t->server, 53); |
1084 | if (fd < 0) | |
1085 | return fd; | |
1086 | ||
1087 | r = sd_event_add_io(t->scope->manager->event, &t->dns_udp_event_source, fd, EPOLLIN, on_dns_packet, t); | |
1088 | if (r < 0) { | |
1089 | safe_close(fd); | |
1090 | return r; | |
1091 | } | |
1092 | ||
aa4a9deb | 1093 | (void) sd_event_source_set_description(t->dns_udp_event_source, "dns-transaction-udp"); |
519ef046 LP |
1094 | t->dns_udp_fd = fd; |
1095 | } | |
1096 | ||
274b8748 | 1097 | r = dns_server_adjust_opt(t->server, t->sent, t->current_feature_level); |
519ef046 LP |
1098 | if (r < 0) |
1099 | return r; | |
1100 | } else | |
1101 | dns_transaction_close_connection(t); | |
1102 | ||
1103 | r = dns_scope_emit_udp(t->scope, t->dns_udp_fd, t->sent); | |
471d40d9 TG |
1104 | if (r < 0) |
1105 | return r; | |
c19ffd9f | 1106 | |
519ef046 | 1107 | dns_transaction_reset_answer(t); |
be808ea0 | 1108 | |
471d40d9 | 1109 | return 0; |
c19ffd9f TG |
1110 | } |
1111 | ||
ec2c5e43 LP |
1112 | static int on_transaction_timeout(sd_event_source *s, usec_t usec, void *userdata) { |
1113 | DnsTransaction *t = userdata; | |
ec2c5e43 LP |
1114 | |
1115 | assert(s); | |
1116 | assert(t); | |
1117 | ||
ef7ce6df DM |
1118 | if (!t->initial_jitter_scheduled || t->initial_jitter_elapsed) { |
1119 | /* Timeout reached? Increase the timeout for the server used */ | |
1120 | switch (t->scope->protocol) { | |
49cce12d | 1121 | |
ef7ce6df DM |
1122 | case DNS_PROTOCOL_DNS: |
1123 | assert(t->server); | |
274b8748 | 1124 | dns_server_packet_lost(t->server, t->stream ? IPPROTO_TCP : IPPROTO_UDP, t->current_feature_level, usec - t->start_usec); |
ef7ce6df | 1125 | break; |
49cce12d | 1126 | |
ef7ce6df DM |
1127 | case DNS_PROTOCOL_LLMNR: |
1128 | case DNS_PROTOCOL_MDNS: | |
1129 | dns_scope_packet_lost(t->scope, usec - t->start_usec); | |
ef7ce6df | 1130 | break; |
49cce12d | 1131 | |
ef7ce6df DM |
1132 | default: |
1133 | assert_not_reached("Invalid DNS protocol."); | |
1134 | } | |
1135 | ||
1136 | if (t->initial_jitter_scheduled) | |
1137 | t->initial_jitter_elapsed = true; | |
be808ea0 TG |
1138 | } |
1139 | ||
423659ab LP |
1140 | log_debug("Timeout reached on transaction %" PRIu16 ".", t->id); |
1141 | ||
8d10d620 | 1142 | dns_transaction_retry(t); |
ec2c5e43 LP |
1143 | return 0; |
1144 | } | |
1145 | ||
9df3ba6c TG |
1146 | static usec_t transaction_get_resend_timeout(DnsTransaction *t) { |
1147 | assert(t); | |
1148 | assert(t->scope); | |
1149 | ||
1150 | switch (t->scope->protocol) { | |
49cce12d | 1151 | |
9df3ba6c TG |
1152 | case DNS_PROTOCOL_DNS: |
1153 | assert(t->server); | |
9df3ba6c | 1154 | return t->server->resend_timeout; |
49cce12d | 1155 | |
9df3ba6c | 1156 | case DNS_PROTOCOL_MDNS: |
11a27c2e DM |
1157 | assert(t->n_attempts > 0); |
1158 | return (1 << (t->n_attempts - 1)) * USEC_PER_SEC; | |
49cce12d | 1159 | |
11a27c2e | 1160 | case DNS_PROTOCOL_LLMNR: |
9df3ba6c | 1161 | return t->scope->resend_timeout; |
49cce12d | 1162 | |
9df3ba6c TG |
1163 | default: |
1164 | assert_not_reached("Invalid DNS protocol."); | |
1165 | } | |
1166 | } | |
1167 | ||
c842ff24 | 1168 | static int dns_transaction_prepare(DnsTransaction *t, usec_t ts) { |
ec2c5e43 LP |
1169 | int r; |
1170 | ||
1171 | assert(t); | |
1172 | ||
f535705a | 1173 | dns_transaction_stop_timeout(t); |
ec2c5e43 | 1174 | |
edbcc1fd LP |
1175 | r = dns_scope_network_good(t->scope); |
1176 | if (r < 0) | |
1177 | return r; | |
1178 | if (r == 0) { | |
1179 | dns_transaction_complete(t, DNS_TRANSACTION_NETWORK_DOWN); | |
1180 | return 0; | |
1181 | } | |
1182 | ||
ec2c5e43 LP |
1183 | if (t->n_attempts >= TRANSACTION_ATTEMPTS_MAX(t->scope->protocol)) { |
1184 | dns_transaction_complete(t, DNS_TRANSACTION_ATTEMPTS_MAX_REACHED); | |
1185 | return 0; | |
1186 | } | |
1187 | ||
cbe4216d | 1188 | if (t->scope->protocol == DNS_PROTOCOL_LLMNR && t->tried_stream) { |
ec2c5e43 LP |
1189 | /* If we already tried via a stream, then we don't |
1190 | * retry on LLMNR. See RFC 4795, Section 2.7. */ | |
1191 | dns_transaction_complete(t, DNS_TRANSACTION_ATTEMPTS_MAX_REACHED); | |
1192 | return 0; | |
1193 | } | |
1194 | ||
1195 | t->n_attempts++; | |
9df3ba6c | 1196 | t->start_usec = ts; |
c61d2b44 LP |
1197 | |
1198 | dns_transaction_reset_answer(t); | |
c5b4f861 | 1199 | dns_transaction_flush_dnssec_transactions(t); |
ec2c5e43 | 1200 | |
0d2cd476 LP |
1201 | /* Check the trust anchor. Do so only on classic DNS, since DNSSEC does not apply otherwise. */ |
1202 | if (t->scope->protocol == DNS_PROTOCOL_DNS) { | |
8e54f5d9 | 1203 | r = dns_trust_anchor_lookup_positive(&t->scope->manager->trust_anchor, t->key, &t->answer); |
0d2cd476 LP |
1204 | if (r < 0) |
1205 | return r; | |
1206 | if (r > 0) { | |
1207 | t->answer_rcode = DNS_RCODE_SUCCESS; | |
1208 | t->answer_source = DNS_TRANSACTION_TRUST_ANCHOR; | |
931851e8 | 1209 | t->answer_authenticated = true; |
0d2cd476 LP |
1210 | dns_transaction_complete(t, DNS_TRANSACTION_SUCCESS); |
1211 | return 0; | |
1212 | } | |
b2b796b8 LP |
1213 | |
1214 | if (dns_name_is_root(DNS_RESOURCE_KEY_NAME(t->key)) && | |
1215 | t->key->type == DNS_TYPE_DS) { | |
1216 | ||
1217 | /* Hmm, this is a request for the root DS? A | |
1218 | * DS RR doesn't exist in the root zone, and | |
1219 | * if our trust anchor didn't know it either, | |
1220 | * this means we cannot do any DNSSEC logic | |
1221 | * anymore. */ | |
1222 | ||
1ed8c0fb | 1223 | if (t->scope->dnssec_mode == DNSSEC_ALLOW_DOWNGRADE) { |
b2b796b8 LP |
1224 | /* We are in downgrade mode. In this |
1225 | * case, synthesize an unsigned empty | |
1226 | * response, so that the any lookup | |
1227 | * depending on this one can continue | |
1228 | * assuming there was no DS, and hence | |
1229 | * the root zone was unsigned. */ | |
1230 | ||
1231 | t->answer_rcode = DNS_RCODE_SUCCESS; | |
1232 | t->answer_source = DNS_TRANSACTION_TRUST_ANCHOR; | |
1233 | t->answer_authenticated = false; | |
1234 | dns_transaction_complete(t, DNS_TRANSACTION_SUCCESS); | |
1235 | } else | |
1236 | /* If we are not in downgrade mode, | |
1237 | * then fail the lookup, because we | |
1238 | * cannot reasonably answer it. There | |
1239 | * might be DS RRs, but we don't know | |
1240 | * them, and the DNS server won't tell | |
1241 | * them to us (and even if it would, | |
1242 | * we couldn't validate it and trust | |
1243 | * it). */ | |
1244 | dns_transaction_complete(t, DNS_TRANSACTION_NO_TRUST_ANCHOR); | |
1245 | ||
1246 | return 0; | |
1247 | } | |
0d2cd476 LP |
1248 | } |
1249 | ||
1250 | /* Check the zone, but only if this transaction is not used | |
d746bb3e | 1251 | * for probing or verifying a zone item. */ |
547973de | 1252 | if (set_isempty(t->notify_zone_items)) { |
d746bb3e | 1253 | |
ae6a4bbf | 1254 | r = dns_zone_lookup(&t->scope->zone, t->key, &t->answer, NULL, NULL); |
d746bb3e LP |
1255 | if (r < 0) |
1256 | return r; | |
1257 | if (r > 0) { | |
ae6a4bbf | 1258 | t->answer_rcode = DNS_RCODE_SUCCESS; |
c3bc53e6 | 1259 | t->answer_source = DNS_TRANSACTION_ZONE; |
931851e8 | 1260 | t->answer_authenticated = true; |
d746bb3e LP |
1261 | dns_transaction_complete(t, DNS_TRANSACTION_SUCCESS); |
1262 | return 0; | |
1263 | } | |
1264 | } | |
1265 | ||
4d926a69 LP |
1266 | /* Check the cache, but only if this transaction is not used |
1267 | * for probing or verifying a zone item. */ | |
547973de | 1268 | if (set_isempty(t->notify_zone_items)) { |
2c27fbca | 1269 | |
4d926a69 LP |
1270 | /* Before trying the cache, let's make sure we figured out a |
1271 | * server to use. Should this cause a change of server this | |
1272 | * might flush the cache. */ | |
1273 | dns_scope_get_dns_server(t->scope); | |
2c27fbca | 1274 | |
4d926a69 LP |
1275 | /* Let's then prune all outdated entries */ |
1276 | dns_cache_prune(&t->scope->cache); | |
1277 | ||
931851e8 | 1278 | r = dns_cache_lookup(&t->scope->cache, t->key, &t->answer_rcode, &t->answer, &t->answer_authenticated); |
4d926a69 LP |
1279 | if (r < 0) |
1280 | return r; | |
1281 | if (r > 0) { | |
c3bc53e6 | 1282 | t->answer_source = DNS_TRANSACTION_CACHE; |
ae6a4bbf | 1283 | if (t->answer_rcode == DNS_RCODE_SUCCESS) |
4d926a69 LP |
1284 | dns_transaction_complete(t, DNS_TRANSACTION_SUCCESS); |
1285 | else | |
3bbdc31d | 1286 | dns_transaction_complete(t, DNS_TRANSACTION_RCODE_FAILURE); |
4d926a69 LP |
1287 | return 0; |
1288 | } | |
ec2c5e43 LP |
1289 | } |
1290 | ||
1effe965 DM |
1291 | return 1; |
1292 | } | |
1293 | ||
0afa57e2 DM |
1294 | static int dns_transaction_make_packet_mdns(DnsTransaction *t) { |
1295 | ||
1296 | _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL; | |
7778dfff | 1297 | bool add_known_answers = false; |
0afa57e2 DM |
1298 | DnsTransaction *other; |
1299 | unsigned qdcount; | |
1300 | usec_t ts; | |
1301 | int r; | |
1302 | ||
1303 | assert(t); | |
1304 | assert(t->scope->protocol == DNS_PROTOCOL_MDNS); | |
1305 | ||
e5abebab | 1306 | /* Discard any previously prepared packet, so we can start over and coalesce again */ |
0afa57e2 DM |
1307 | t->sent = dns_packet_unref(t->sent); |
1308 | ||
1309 | r = dns_packet_new_query(&p, t->scope->protocol, 0, false); | |
1310 | if (r < 0) | |
1311 | return r; | |
1312 | ||
1313 | r = dns_packet_append_key(p, t->key, NULL); | |
1314 | if (r < 0) | |
1315 | return r; | |
1316 | ||
1317 | qdcount = 1; | |
1318 | ||
7778dfff DM |
1319 | if (dns_key_is_shared(t->key)) |
1320 | add_known_answers = true; | |
1321 | ||
0afa57e2 DM |
1322 | /* |
1323 | * For mDNS, we want to coalesce as many open queries in pending transactions into one single | |
1324 | * query packet on the wire as possible. To achieve that, we iterate through all pending transactions | |
1325 | * in our current scope, and see whether their timing contraints allow them to be sent. | |
1326 | */ | |
1327 | ||
1328 | assert_se(sd_event_now(t->scope->manager->event, clock_boottime_or_monotonic(), &ts) >= 0); | |
1329 | ||
1330 | LIST_FOREACH(transactions_by_scope, other, t->scope->transactions) { | |
1331 | ||
1332 | /* Skip ourselves */ | |
1333 | if (other == t) | |
1334 | continue; | |
1335 | ||
1336 | if (other->state != DNS_TRANSACTION_PENDING) | |
1337 | continue; | |
1338 | ||
1339 | if (other->next_attempt_after > ts) | |
1340 | continue; | |
1341 | ||
1342 | if (qdcount >= UINT16_MAX) | |
1343 | break; | |
1344 | ||
1345 | r = dns_packet_append_key(p, other->key, NULL); | |
1346 | ||
1347 | /* | |
1348 | * If we can't stuff more questions into the packet, just give up. | |
1349 | * One of the 'other' transactions will fire later and take care of the rest. | |
1350 | */ | |
1351 | if (r == -EMSGSIZE) | |
1352 | break; | |
1353 | ||
1354 | if (r < 0) | |
1355 | return r; | |
1356 | ||
c842ff24 | 1357 | r = dns_transaction_prepare(other, ts); |
0afa57e2 DM |
1358 | if (r <= 0) |
1359 | continue; | |
1360 | ||
1361 | ts += transaction_get_resend_timeout(other); | |
1362 | ||
1363 | r = sd_event_add_time( | |
1364 | other->scope->manager->event, | |
1365 | &other->timeout_event_source, | |
1366 | clock_boottime_or_monotonic(), | |
1367 | ts, 0, | |
1368 | on_transaction_timeout, other); | |
1369 | if (r < 0) | |
1370 | return r; | |
1371 | ||
aa4a9deb LP |
1372 | (void) sd_event_source_set_description(t->timeout_event_source, "dns-transaction-timeout"); |
1373 | ||
0afa57e2 DM |
1374 | other->state = DNS_TRANSACTION_PENDING; |
1375 | other->next_attempt_after = ts; | |
1376 | ||
1377 | qdcount ++; | |
7778dfff DM |
1378 | |
1379 | if (dns_key_is_shared(other->key)) | |
1380 | add_known_answers = true; | |
0afa57e2 DM |
1381 | } |
1382 | ||
1383 | DNS_PACKET_HEADER(p)->qdcount = htobe16(qdcount); | |
0afa57e2 | 1384 | |
7778dfff DM |
1385 | /* Append known answer section if we're asking for any shared record */ |
1386 | if (add_known_answers) { | |
1387 | r = dns_cache_export_shared_to_packet(&t->scope->cache, p); | |
1388 | if (r < 0) | |
1389 | return r; | |
1390 | } | |
1391 | ||
0afa57e2 DM |
1392 | t->sent = p; |
1393 | p = NULL; | |
1394 | ||
1395 | return 0; | |
1396 | } | |
1397 | ||
1398 | static int dns_transaction_make_packet(DnsTransaction *t) { | |
1399 | _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL; | |
1400 | int r; | |
1401 | ||
1402 | assert(t); | |
1403 | ||
1404 | if (t->scope->protocol == DNS_PROTOCOL_MDNS) | |
1405 | return dns_transaction_make_packet_mdns(t); | |
1406 | ||
1407 | if (t->sent) | |
1408 | return 0; | |
1409 | ||
b652d4a2 | 1410 | r = dns_packet_new_query(&p, t->scope->protocol, 0, t->scope->dnssec_mode != DNSSEC_NO); |
0afa57e2 DM |
1411 | if (r < 0) |
1412 | return r; | |
1413 | ||
0afa57e2 DM |
1414 | r = dns_packet_append_key(p, t->key, NULL); |
1415 | if (r < 0) | |
1416 | return r; | |
1417 | ||
1418 | DNS_PACKET_HEADER(p)->qdcount = htobe16(1); | |
1419 | DNS_PACKET_HEADER(p)->id = t->id; | |
1420 | ||
1421 | t->sent = p; | |
1422 | p = NULL; | |
1423 | ||
1424 | return 0; | |
1425 | } | |
1426 | ||
1effe965 DM |
1427 | int dns_transaction_go(DnsTransaction *t) { |
1428 | usec_t ts; | |
1429 | int r; | |
1430 | ||
1431 | assert(t); | |
1432 | ||
1433 | assert_se(sd_event_now(t->scope->manager->event, clock_boottime_or_monotonic(), &ts) >= 0); | |
547973de | 1434 | |
c842ff24 | 1435 | r = dns_transaction_prepare(t, ts); |
1effe965 DM |
1436 | if (r <= 0) |
1437 | return r; | |
1438 | ||
a5784c49 LP |
1439 | log_debug("Excercising transaction %" PRIu16 " for <%s> on scope %s on %s/%s.", |
1440 | t->id, | |
1441 | dns_transaction_key_string(t), | |
1442 | dns_protocol_to_string(t->scope->protocol), | |
1443 | t->scope->link ? t->scope->link->name : "*", | |
1444 | t->scope->family == AF_UNSPEC ? "*" : af_to_name(t->scope->family)); | |
1effe965 | 1445 | |
ef7ce6df | 1446 | if (!t->initial_jitter_scheduled && |
ea12bcc7 DM |
1447 | (t->scope->protocol == DNS_PROTOCOL_LLMNR || |
1448 | t->scope->protocol == DNS_PROTOCOL_MDNS)) { | |
1449 | usec_t jitter, accuracy; | |
6e068472 LP |
1450 | |
1451 | /* RFC 4795 Section 2.7 suggests all queries should be | |
1452 | * delayed by a random time from 0 to JITTER_INTERVAL. */ | |
1453 | ||
ef7ce6df | 1454 | t->initial_jitter_scheduled = true; |
6e068472 LP |
1455 | |
1456 | random_bytes(&jitter, sizeof(jitter)); | |
ea12bcc7 DM |
1457 | |
1458 | switch (t->scope->protocol) { | |
519ef046 | 1459 | |
ea12bcc7 DM |
1460 | case DNS_PROTOCOL_LLMNR: |
1461 | jitter %= LLMNR_JITTER_INTERVAL_USEC; | |
1462 | accuracy = LLMNR_JITTER_INTERVAL_USEC; | |
1463 | break; | |
519ef046 | 1464 | |
ea12bcc7 DM |
1465 | case DNS_PROTOCOL_MDNS: |
1466 | jitter %= MDNS_JITTER_RANGE_USEC; | |
1467 | jitter += MDNS_JITTER_MIN_USEC; | |
1468 | accuracy = MDNS_JITTER_RANGE_USEC; | |
1469 | break; | |
1470 | default: | |
1471 | assert_not_reached("bad protocol"); | |
1472 | } | |
6e068472 LP |
1473 | |
1474 | r = sd_event_add_time( | |
1475 | t->scope->manager->event, | |
1476 | &t->timeout_event_source, | |
1477 | clock_boottime_or_monotonic(), | |
ea12bcc7 | 1478 | ts + jitter, accuracy, |
6e068472 LP |
1479 | on_transaction_timeout, t); |
1480 | if (r < 0) | |
1481 | return r; | |
1482 | ||
aa4a9deb LP |
1483 | (void) sd_event_source_set_description(t->timeout_event_source, "dns-transaction-timeout"); |
1484 | ||
6e068472 | 1485 | t->n_attempts = 0; |
a9da14e1 | 1486 | t->next_attempt_after = ts; |
6e068472 LP |
1487 | t->state = DNS_TRANSACTION_PENDING; |
1488 | ||
ea12bcc7 | 1489 | log_debug("Delaying %s transaction for " USEC_FMT "us.", dns_protocol_to_string(t->scope->protocol), jitter); |
6e068472 LP |
1490 | return 0; |
1491 | } | |
1492 | ||
ec2c5e43 LP |
1493 | /* Otherwise, we need to ask the network */ |
1494 | r = dns_transaction_make_packet(t); | |
ec2c5e43 LP |
1495 | if (r < 0) |
1496 | return r; | |
1497 | ||
1498 | if (t->scope->protocol == DNS_PROTOCOL_LLMNR && | |
f52e61da LP |
1499 | (dns_name_endswith(DNS_RESOURCE_KEY_NAME(t->key), "in-addr.arpa") > 0 || |
1500 | dns_name_endswith(DNS_RESOURCE_KEY_NAME(t->key), "ip6.arpa") > 0)) { | |
ec2c5e43 LP |
1501 | |
1502 | /* RFC 4795, Section 2.4. says reverse lookups shall | |
1503 | * always be made via TCP on LLMNR */ | |
1504 | r = dns_transaction_open_tcp(t); | |
1505 | } else { | |
be808ea0 TG |
1506 | /* Try via UDP, and if that fails due to large size or lack of |
1507 | * support try via TCP */ | |
49cce12d | 1508 | r = dns_transaction_emit_udp(t); |
29ab0552 LP |
1509 | if (r == -EMSGSIZE) |
1510 | log_debug("Sending query via TCP since it is too large."); | |
034e8031 LP |
1511 | if (r == -EAGAIN) |
1512 | log_debug("Sending query via TCP since server doesn't support UDP."); | |
be808ea0 | 1513 | if (r == -EMSGSIZE || r == -EAGAIN) |
ec2c5e43 LP |
1514 | r = dns_transaction_open_tcp(t); |
1515 | } | |
be808ea0 | 1516 | |
ec2c5e43 LP |
1517 | if (r == -ESRCH) { |
1518 | /* No servers to send this to? */ | |
1519 | dns_transaction_complete(t, DNS_TRANSACTION_NO_SERVERS); | |
1520 | return 0; | |
91adc4db LP |
1521 | } |
1522 | if (r == -EOPNOTSUPP) { | |
1523 | /* Tried to ask for DNSSEC RRs, on a server that doesn't do DNSSEC */ | |
1524 | dns_transaction_complete(t, DNS_TRANSACTION_RR_TYPE_UNSUPPORTED); | |
1525 | return 0; | |
1526 | } | |
0791110f | 1527 | if (t->scope->protocol == DNS_PROTOCOL_LLMNR && ERRNO_IS_DISCONNECT(-r)) { |
e94968ba | 1528 | /* On LLMNR, if we cannot connect to a host via TCP when doing reverse lookups. This means we cannot |
0791110f LP |
1529 | * answer this request with this protocol. */ |
1530 | dns_transaction_complete(t, DNS_TRANSACTION_NOT_FOUND); | |
1531 | return 0; | |
1532 | } | |
91adc4db | 1533 | if (r < 0) { |
7cc6ed7b LP |
1534 | if (t->scope->protocol != DNS_PROTOCOL_DNS) |
1535 | return r; | |
13b551ac | 1536 | |
ec2c5e43 | 1537 | /* Couldn't send? Try immediately again, with a new server */ |
519ef046 | 1538 | dns_scope_next_dns_server(t->scope); |
ec2c5e43 LP |
1539 | |
1540 | return dns_transaction_go(t); | |
1541 | } | |
1542 | ||
a9da14e1 DM |
1543 | ts += transaction_get_resend_timeout(t); |
1544 | ||
9a015429 LP |
1545 | r = sd_event_add_time( |
1546 | t->scope->manager->event, | |
1547 | &t->timeout_event_source, | |
1548 | clock_boottime_or_monotonic(), | |
a9da14e1 | 1549 | ts, 0, |
9a015429 | 1550 | on_transaction_timeout, t); |
ec2c5e43 LP |
1551 | if (r < 0) |
1552 | return r; | |
1553 | ||
aa4a9deb LP |
1554 | (void) sd_event_source_set_description(t->timeout_event_source, "dns-transaction-timeout"); |
1555 | ||
ec2c5e43 | 1556 | t->state = DNS_TRANSACTION_PENDING; |
a9da14e1 DM |
1557 | t->next_attempt_after = ts; |
1558 | ||
ec2c5e43 LP |
1559 | return 1; |
1560 | } | |
1561 | ||
f2992dc1 LP |
1562 | static int dns_transaction_find_cyclic(DnsTransaction *t, DnsTransaction *aux) { |
1563 | DnsTransaction *n; | |
1564 | Iterator i; | |
1565 | int r; | |
1566 | ||
1567 | assert(t); | |
1568 | assert(aux); | |
1569 | ||
1570 | /* Try to find cyclic dependencies between transaction objects */ | |
1571 | ||
1572 | if (t == aux) | |
1573 | return 1; | |
1574 | ||
3eb6aa00 | 1575 | SET_FOREACH(n, aux->dnssec_transactions, i) { |
f2992dc1 LP |
1576 | r = dns_transaction_find_cyclic(t, n); |
1577 | if (r != 0) | |
1578 | return r; | |
1579 | } | |
1580 | ||
3eb6aa00 | 1581 | return 0; |
f2992dc1 LP |
1582 | } |
1583 | ||
547973de LP |
1584 | static int dns_transaction_add_dnssec_transaction(DnsTransaction *t, DnsResourceKey *key, DnsTransaction **ret) { |
1585 | DnsTransaction *aux; | |
1586 | int r; | |
1587 | ||
1588 | assert(t); | |
1589 | assert(ret); | |
1590 | assert(key); | |
1591 | ||
1592 | aux = dns_scope_find_transaction(t->scope, key, true); | |
1593 | if (!aux) { | |
1594 | r = dns_transaction_new(&aux, t->scope, key); | |
1595 | if (r < 0) | |
1596 | return r; | |
1597 | } else { | |
1598 | if (set_contains(t->dnssec_transactions, aux)) { | |
1599 | *ret = aux; | |
1600 | return 0; | |
1601 | } | |
f2992dc1 LP |
1602 | |
1603 | r = dns_transaction_find_cyclic(t, aux); | |
1604 | if (r < 0) | |
1605 | return r; | |
1606 | if (r > 0) { | |
1607 | log_debug("Detected potential cyclic dependency, refusing to add transaction %" PRIu16 " (%s) as dependency for %" PRIu16 " (%s).", | |
1608 | aux->id, | |
1609 | strna(dns_transaction_key_string(aux)), | |
1610 | t->id, | |
1611 | strna(dns_transaction_key_string(t))); | |
1612 | return -ELOOP; | |
1613 | } | |
547973de LP |
1614 | } |
1615 | ||
1616 | r = set_ensure_allocated(&t->dnssec_transactions, NULL); | |
1617 | if (r < 0) | |
1618 | goto gc; | |
1619 | ||
1620 | r = set_ensure_allocated(&aux->notify_transactions, NULL); | |
1621 | if (r < 0) | |
1622 | goto gc; | |
1623 | ||
1624 | r = set_put(t->dnssec_transactions, aux); | |
1625 | if (r < 0) | |
1626 | goto gc; | |
1627 | ||
1628 | r = set_put(aux->notify_transactions, t); | |
1629 | if (r < 0) { | |
1630 | (void) set_remove(t->dnssec_transactions, aux); | |
1631 | goto gc; | |
1632 | } | |
1633 | ||
1634 | *ret = aux; | |
1635 | return 1; | |
1636 | ||
1637 | gc: | |
1638 | dns_transaction_gc(aux); | |
1639 | return r; | |
1640 | } | |
1641 | ||
1642 | static int dns_transaction_request_dnssec_rr(DnsTransaction *t, DnsResourceKey *key) { | |
1643 | _cleanup_(dns_answer_unrefp) DnsAnswer *a = NULL; | |
1644 | DnsTransaction *aux; | |
1645 | int r; | |
1646 | ||
1647 | assert(t); | |
1648 | assert(key); | |
1649 | ||
1650 | /* Try to get the data from the trust anchor */ | |
8e54f5d9 | 1651 | r = dns_trust_anchor_lookup_positive(&t->scope->manager->trust_anchor, key, &a); |
547973de LP |
1652 | if (r < 0) |
1653 | return r; | |
1654 | if (r > 0) { | |
1655 | r = dns_answer_extend(&t->validated_keys, a); | |
1656 | if (r < 0) | |
1657 | return r; | |
1658 | ||
1659 | return 0; | |
1660 | } | |
1661 | ||
1662 | /* This didn't work, ask for it via the network/cache then. */ | |
1663 | r = dns_transaction_add_dnssec_transaction(t, key, &aux); | |
f2992dc1 LP |
1664 | if (r == -ELOOP) /* This would result in a cyclic dependency */ |
1665 | return 0; | |
547973de LP |
1666 | if (r < 0) |
1667 | return r; | |
1668 | ||
1669 | if (aux->state == DNS_TRANSACTION_NULL) { | |
1670 | r = dns_transaction_go(aux); | |
1671 | if (r < 0) | |
1672 | return r; | |
1673 | } | |
1674 | ||
f2992dc1 | 1675 | return 1; |
547973de LP |
1676 | } |
1677 | ||
8a516214 LP |
1678 | static int dns_transaction_negative_trust_anchor_lookup(DnsTransaction *t, const char *name) { |
1679 | int r; | |
1680 | ||
1681 | assert(t); | |
1682 | ||
1683 | /* Check whether the specified name is in the the NTA | |
1684 | * database, either in the global one, or the link-local | |
1685 | * one. */ | |
1686 | ||
1687 | r = dns_trust_anchor_lookup_negative(&t->scope->manager->trust_anchor, name); | |
1688 | if (r != 0) | |
1689 | return r; | |
1690 | ||
1691 | if (!t->scope->link) | |
1692 | return 0; | |
1693 | ||
1694 | return set_contains(t->scope->link->dnssec_negative_trust_anchors, name); | |
1695 | } | |
1696 | ||
105e1512 LP |
1697 | static int dns_transaction_has_unsigned_negative_answer(DnsTransaction *t) { |
1698 | int r; | |
1699 | ||
1700 | assert(t); | |
1701 | ||
1702 | /* Checks whether the answer is negative, and lacks NSEC/NSEC3 | |
1703 | * RRs to prove it */ | |
1704 | ||
1705 | r = dns_transaction_has_positive_answer(t, NULL); | |
1706 | if (r < 0) | |
1707 | return r; | |
1708 | if (r > 0) | |
1709 | return false; | |
1710 | ||
8e54f5d9 LP |
1711 | /* Is this key explicitly listed as a negative trust anchor? |
1712 | * If so, it's nothing we need to care about */ | |
8a516214 | 1713 | r = dns_transaction_negative_trust_anchor_lookup(t, DNS_RESOURCE_KEY_NAME(t->key)); |
8e54f5d9 LP |
1714 | if (r < 0) |
1715 | return r; | |
1716 | if (r > 0) | |
1717 | return false; | |
1718 | ||
105e1512 LP |
1719 | /* The answer does not contain any RRs that match to the |
1720 | * question. If so, let's see if there are any NSEC/NSEC3 RRs | |
1721 | * included. If not, the answer is unsigned. */ | |
1722 | ||
1723 | r = dns_answer_contains_nsec_or_nsec3(t->answer); | |
1724 | if (r < 0) | |
1725 | return r; | |
1726 | if (r > 0) | |
1727 | return false; | |
1728 | ||
1729 | return true; | |
1730 | } | |
1731 | ||
1732 | static int dns_transaction_is_primary_response(DnsTransaction *t, DnsResourceRecord *rr) { | |
1733 | int r; | |
1734 | ||
1735 | assert(t); | |
1736 | assert(rr); | |
1737 | ||
1738 | /* Check if the specified RR is the "primary" response, | |
1739 | * i.e. either matches the question precisely or is a | |
4cb94977 | 1740 | * CNAME/DNAME for it. */ |
105e1512 LP |
1741 | |
1742 | r = dns_resource_key_match_rr(t->key, rr, NULL); | |
1743 | if (r != 0) | |
1744 | return r; | |
1745 | ||
4cb94977 | 1746 | return dns_resource_key_match_cname_or_dname(t->key, rr->key, NULL); |
105e1512 LP |
1747 | } |
1748 | ||
92ec902a LP |
1749 | static bool dns_transaction_dnssec_supported(DnsTransaction *t) { |
1750 | assert(t); | |
1751 | ||
1752 | /* Checks whether our transaction's DNS server is assumed to be compatible with DNSSEC. Returns false as soon | |
1753 | * as we changed our mind about a server, and now believe it is incompatible with DNSSEC. */ | |
1754 | ||
1755 | if (t->scope->protocol != DNS_PROTOCOL_DNS) | |
1756 | return false; | |
1757 | ||
1758 | /* If we have picked no server, then we are working from the cache or some other source, and DNSSEC might well | |
1759 | * be supported, hence return true. */ | |
1760 | if (!t->server) | |
1761 | return true; | |
1762 | ||
274b8748 | 1763 | if (t->current_feature_level < DNS_SERVER_FEATURE_LEVEL_DO) |
92ec902a LP |
1764 | return false; |
1765 | ||
1766 | return dns_server_dnssec_supported(t->server); | |
1767 | } | |
1768 | ||
1769 | static bool dns_transaction_dnssec_supported_full(DnsTransaction *t) { | |
1770 | DnsTransaction *dt; | |
1771 | Iterator i; | |
1772 | ||
1773 | assert(t); | |
1774 | ||
1775 | /* Checks whether our transaction our any of the auxiliary transactions couldn't do DNSSEC. */ | |
1776 | ||
1777 | if (!dns_transaction_dnssec_supported(t)) | |
1778 | return false; | |
1779 | ||
1780 | SET_FOREACH(dt, t->dnssec_transactions, i) | |
1781 | if (!dns_transaction_dnssec_supported(dt)) | |
1782 | return false; | |
1783 | ||
1784 | return true; | |
1785 | } | |
1786 | ||
547973de LP |
1787 | int dns_transaction_request_dnssec_keys(DnsTransaction *t) { |
1788 | DnsResourceRecord *rr; | |
105e1512 | 1789 | |
547973de LP |
1790 | int r; |
1791 | ||
1792 | assert(t); | |
1793 | ||
105e1512 LP |
1794 | /* |
1795 | * Retrieve all auxiliary RRs for the answer we got, so that | |
1796 | * we can verify signatures or prove that RRs are rightfully | |
1797 | * unsigned. Specifically: | |
1798 | * | |
1799 | * - For RRSIG we get the matching DNSKEY | |
1800 | * - For DNSKEY we get the matching DS | |
1801 | * - For unsigned SOA/NS we get the matching DS | |
b63fca62 | 1802 | * - For unsigned CNAME/DNAME/DS we get the parent SOA RR |
105e1512 LP |
1803 | * - For other unsigned RRs we get the matching SOA RR |
1804 | * - For SOA/NS/DS queries with no matching response RRs, and no NSEC/NSEC3, the parent's SOA RR | |
1805 | * - For other queries with no matching response RRs, and no NSEC/NSEC3, the SOA RR | |
1806 | */ | |
1807 | ||
b652d4a2 | 1808 | if (t->scope->dnssec_mode == DNSSEC_NO) |
547973de | 1809 | return 0; |
92ec902a LP |
1810 | if (t->answer_source != DNS_TRANSACTION_NETWORK) |
1811 | return 0; /* We only need to validate stuff from the network */ | |
1812 | if (!dns_transaction_dnssec_supported(t)) | |
1813 | return 0; /* If we can't do DNSSEC anyway there's no point in geting the auxiliary RRs */ | |
b652d4a2 | 1814 | |
547973de LP |
1815 | DNS_ANSWER_FOREACH(rr, t->answer) { |
1816 | ||
105e1512 LP |
1817 | if (dns_type_is_pseudo(rr->key->type)) |
1818 | continue; | |
1819 | ||
8e54f5d9 | 1820 | /* If this RR is in the negative trust anchor, we don't need to validate it. */ |
8a516214 | 1821 | r = dns_transaction_negative_trust_anchor_lookup(t, DNS_RESOURCE_KEY_NAME(rr->key)); |
8e54f5d9 LP |
1822 | if (r < 0) |
1823 | return r; | |
1824 | if (r > 0) | |
1825 | continue; | |
1826 | ||
547973de LP |
1827 | switch (rr->key->type) { |
1828 | ||
1829 | case DNS_TYPE_RRSIG: { | |
1830 | /* For each RRSIG we request the matching DNSKEY */ | |
1831 | _cleanup_(dns_resource_key_unrefp) DnsResourceKey *dnskey = NULL; | |
1832 | ||
1833 | /* If this RRSIG is about a DNSKEY RR and the | |
1834 | * signer is the same as the owner, then we | |
1835 | * already have the DNSKEY, and we don't have | |
1836 | * to look for more. */ | |
1837 | if (rr->rrsig.type_covered == DNS_TYPE_DNSKEY) { | |
1838 | r = dns_name_equal(rr->rrsig.signer, DNS_RESOURCE_KEY_NAME(rr->key)); | |
1839 | if (r < 0) | |
1840 | return r; | |
1841 | if (r > 0) | |
1842 | continue; | |
1843 | } | |
1844 | ||
105e1512 LP |
1845 | /* If the signer is not a parent of our |
1846 | * original query, then this is about an | |
1847 | * auxiliary RRset, but not anything we asked | |
1848 | * for. In this case we aren't interested, | |
1849 | * because we don't want to request additional | |
1850 | * RRs for stuff we didn't really ask for, and | |
1851 | * also to avoid request loops, where | |
1852 | * additional RRs from one transaction result | |
1853 | * in another transaction whose additonal RRs | |
1854 | * point back to the original transaction, and | |
1855 | * we deadlock. */ | |
1856 | r = dns_name_endswith(DNS_RESOURCE_KEY_NAME(t->key), rr->rrsig.signer); | |
547973de LP |
1857 | if (r < 0) |
1858 | return r; | |
1859 | if (r == 0) | |
1860 | continue; | |
1861 | ||
1862 | dnskey = dns_resource_key_new(rr->key->class, DNS_TYPE_DNSKEY, rr->rrsig.signer); | |
1863 | if (!dnskey) | |
1864 | return -ENOMEM; | |
1865 | ||
105e1512 | 1866 | log_debug("Requesting DNSKEY to validate transaction %" PRIu16" (%s, RRSIG with key tag: %" PRIu16 ").", t->id, DNS_RESOURCE_KEY_NAME(rr->key), rr->rrsig.key_tag); |
547973de LP |
1867 | r = dns_transaction_request_dnssec_rr(t, dnskey); |
1868 | if (r < 0) | |
1869 | return r; | |
1870 | break; | |
1871 | } | |
1872 | ||
1873 | case DNS_TYPE_DNSKEY: { | |
1874 | /* For each DNSKEY we request the matching DS */ | |
1875 | _cleanup_(dns_resource_key_unrefp) DnsResourceKey *ds = NULL; | |
1876 | ||
105e1512 LP |
1877 | /* If the DNSKEY we are looking at is not for |
1878 | * zone we are interested in, nor any of its | |
1879 | * parents, we aren't interested, and don't | |
1880 | * request it. After all, we don't want to end | |
1881 | * up in request loops, and want to keep | |
1882 | * additional traffic down. */ | |
1883 | ||
1884 | r = dns_name_endswith(DNS_RESOURCE_KEY_NAME(t->key), DNS_RESOURCE_KEY_NAME(rr->key)); | |
1885 | if (r < 0) | |
1886 | return r; | |
1887 | if (r == 0) | |
1888 | continue; | |
1889 | ||
547973de LP |
1890 | ds = dns_resource_key_new(rr->key->class, DNS_TYPE_DS, DNS_RESOURCE_KEY_NAME(rr->key)); |
1891 | if (!ds) | |
1892 | return -ENOMEM; | |
1893 | ||
0c857028 | 1894 | log_debug("Requesting DS to validate transaction %" PRIu16" (%s, DNSKEY with key tag: %" PRIu16 ").", t->id, DNS_RESOURCE_KEY_NAME(rr->key), dnssec_keytag(rr, false)); |
105e1512 LP |
1895 | r = dns_transaction_request_dnssec_rr(t, ds); |
1896 | if (r < 0) | |
1897 | return r; | |
547973de | 1898 | |
105e1512 LP |
1899 | break; |
1900 | } | |
1901 | ||
105e1512 LP |
1902 | case DNS_TYPE_SOA: |
1903 | case DNS_TYPE_NS: { | |
1904 | _cleanup_(dns_resource_key_unrefp) DnsResourceKey *ds = NULL; | |
1905 | ||
1906 | /* For an unsigned SOA or NS, try to acquire | |
1907 | * the matching DS RR, as we are at a zone cut | |
1908 | * then, and whether a DS exists tells us | |
1909 | * whether the zone is signed. Do so only if | |
1910 | * this RR matches our original question, | |
1911 | * however. */ | |
1912 | ||
1913 | r = dns_resource_key_match_rr(t->key, rr, NULL); | |
1914 | if (r < 0) | |
1915 | return r; | |
1916 | if (r == 0) | |
1917 | continue; | |
1918 | ||
1919 | r = dnssec_has_rrsig(t->answer, rr->key); | |
1920 | if (r < 0) | |
1921 | return r; | |
1922 | if (r > 0) | |
1923 | continue; | |
1924 | ||
1925 | ds = dns_resource_key_new(rr->key->class, DNS_TYPE_DS, DNS_RESOURCE_KEY_NAME(rr->key)); | |
1926 | if (!ds) | |
1927 | return -ENOMEM; | |
1928 | ||
1929 | log_debug("Requesting DS to validate transaction %" PRIu16 " (%s, unsigned SOA/NS RRset).", t->id, DNS_RESOURCE_KEY_NAME(rr->key)); | |
547973de LP |
1930 | r = dns_transaction_request_dnssec_rr(t, ds); |
1931 | if (r < 0) | |
1932 | return r; | |
1933 | ||
1934 | break; | |
105e1512 LP |
1935 | } |
1936 | ||
b63fca62 | 1937 | case DNS_TYPE_DS: |
105e1512 LP |
1938 | case DNS_TYPE_CNAME: |
1939 | case DNS_TYPE_DNAME: { | |
1940 | _cleanup_(dns_resource_key_unrefp) DnsResourceKey *soa = NULL; | |
1941 | const char *name; | |
1942 | ||
1943 | /* CNAMEs and DNAMEs cannot be located at a | |
1944 | * zone apex, hence ask for the parent SOA for | |
1945 | * unsigned CNAME/DNAME RRs, maybe that's the | |
1946 | * apex. But do all that only if this is | |
1947 | * actually a response to our original | |
b63fca62 LP |
1948 | * question. |
1949 | * | |
1950 | * Similar for DS RRs, which are signed when | |
1951 | * the parent SOA is signed. */ | |
105e1512 LP |
1952 | |
1953 | r = dns_transaction_is_primary_response(t, rr); | |
1954 | if (r < 0) | |
1955 | return r; | |
1956 | if (r == 0) | |
1957 | continue; | |
1958 | ||
1959 | r = dnssec_has_rrsig(t->answer, rr->key); | |
1960 | if (r < 0) | |
1961 | return r; | |
1962 | if (r > 0) | |
1963 | continue; | |
1964 | ||
43e6779a LP |
1965 | r = dns_answer_has_dname_for_cname(t->answer, rr); |
1966 | if (r < 0) | |
1967 | return r; | |
1968 | if (r > 0) | |
1969 | continue; | |
1970 | ||
105e1512 LP |
1971 | name = DNS_RESOURCE_KEY_NAME(rr->key); |
1972 | r = dns_name_parent(&name); | |
1973 | if (r < 0) | |
1974 | return r; | |
1975 | if (r == 0) | |
1976 | continue; | |
1977 | ||
1978 | soa = dns_resource_key_new(rr->key->class, DNS_TYPE_SOA, name); | |
1979 | if (!soa) | |
1980 | return -ENOMEM; | |
1981 | ||
b63fca62 | 1982 | log_debug("Requesting parent SOA to validate transaction %" PRIu16 " (%s, unsigned CNAME/DNAME/DS RRset).", t->id, DNS_RESOURCE_KEY_NAME(rr->key)); |
105e1512 LP |
1983 | r = dns_transaction_request_dnssec_rr(t, soa); |
1984 | if (r < 0) | |
1985 | return r; | |
1986 | ||
1987 | break; | |
1988 | } | |
1989 | ||
1990 | default: { | |
1991 | _cleanup_(dns_resource_key_unrefp) DnsResourceKey *soa = NULL; | |
1992 | ||
b63fca62 LP |
1993 | /* For other unsigned RRsets (including |
1994 | * NSEC/NSEC3!), look for proof the zone is | |
1995 | * unsigned, by requesting the SOA RR of the | |
1996 | * zone. However, do so only if they are | |
1997 | * directly relevant to our original | |
105e1512 LP |
1998 | * question. */ |
1999 | ||
2000 | r = dns_transaction_is_primary_response(t, rr); | |
2001 | if (r < 0) | |
2002 | return r; | |
2003 | if (r == 0) | |
2004 | continue; | |
2005 | ||
2006 | r = dnssec_has_rrsig(t->answer, rr->key); | |
2007 | if (r < 0) | |
2008 | return r; | |
2009 | if (r > 0) | |
2010 | continue; | |
2011 | ||
2012 | soa = dns_resource_key_new(rr->key->class, DNS_TYPE_SOA, DNS_RESOURCE_KEY_NAME(rr->key)); | |
2013 | if (!soa) | |
2014 | return -ENOMEM; | |
2015 | ||
db5b0e92 | 2016 | log_debug("Requesting SOA to validate transaction %" PRIu16 " (%s, unsigned non-SOA/NS RRset <%s>).", t->id, DNS_RESOURCE_KEY_NAME(rr->key), dns_resource_record_to_string(rr)); |
105e1512 LP |
2017 | r = dns_transaction_request_dnssec_rr(t, soa); |
2018 | if (r < 0) | |
2019 | return r; | |
2020 | break; | |
547973de LP |
2021 | }} |
2022 | } | |
2023 | ||
105e1512 LP |
2024 | /* Above, we requested everything necessary to validate what |
2025 | * we got. Now, let's request what we need to validate what we | |
2026 | * didn't get... */ | |
2027 | ||
2028 | r = dns_transaction_has_unsigned_negative_answer(t); | |
2029 | if (r < 0) | |
2030 | return r; | |
2031 | if (r > 0) { | |
2032 | const char *name; | |
2033 | ||
2034 | name = DNS_RESOURCE_KEY_NAME(t->key); | |
2035 | ||
2036 | /* If this was a SOA or NS request, then this | |
2037 | * indicates that we are not at a zone apex, hence ask | |
2038 | * the parent name instead. If this was a DS request, | |
2039 | * then it's signed when the parent zone is signed, | |
2040 | * hence ask the parent in that case, too. */ | |
2041 | ||
2042 | if (IN_SET(t->key->type, DNS_TYPE_SOA, DNS_TYPE_NS, DNS_TYPE_DS)) { | |
2043 | r = dns_name_parent(&name); | |
2044 | if (r < 0) | |
2045 | return r; | |
2046 | if (r > 0) | |
2047 | log_debug("Requesting parent SOA to validate transaction %" PRIu16 " (%s, unsigned empty SOA/NS/DS response).", t->id, DNS_RESOURCE_KEY_NAME(t->key)); | |
2048 | else | |
2049 | name = NULL; | |
2050 | } else | |
2051 | log_debug("Requesting SOA to validate transaction %" PRIu16 " (%s, unsigned empty non-SOA/NS/DS response).", t->id, DNS_RESOURCE_KEY_NAME(t->key)); | |
2052 | ||
2053 | if (name) { | |
2054 | _cleanup_(dns_resource_key_unrefp) DnsResourceKey *soa = NULL; | |
2055 | ||
2056 | soa = dns_resource_key_new(t->key->class, DNS_TYPE_SOA, name); | |
2057 | if (!soa) | |
2058 | return -ENOMEM; | |
2059 | ||
2060 | r = dns_transaction_request_dnssec_rr(t, soa); | |
2061 | if (r < 0) | |
2062 | return r; | |
2063 | } | |
2064 | } | |
2065 | ||
2066 | return dns_transaction_dnssec_is_live(t); | |
547973de LP |
2067 | } |
2068 | ||
2069 | void dns_transaction_notify(DnsTransaction *t, DnsTransaction *source) { | |
547973de | 2070 | assert(t); |
547973de LP |
2071 | assert(source); |
2072 | ||
942eb2e7 LP |
2073 | /* Invoked whenever any of our auxiliary DNSSEC transactions completed its work. If the state is still PENDING, |
2074 | we are still in the loop that adds further DNSSEC transactions, hence don't check if we are ready yet. If | |
2075 | the state is VALIDATING however, we should check if we are complete now. */ | |
105e1512 | 2076 | |
942eb2e7 LP |
2077 | if (t->state == DNS_TRANSACTION_VALIDATING) |
2078 | dns_transaction_process_dnssec(t); | |
547973de LP |
2079 | } |
2080 | ||
105e1512 LP |
2081 | static int dns_transaction_validate_dnskey_by_ds(DnsTransaction *t) { |
2082 | DnsResourceRecord *rr; | |
2083 | int ifindex, r; | |
2084 | ||
2085 | assert(t); | |
2086 | ||
2087 | /* Add all DNSKEY RRs from the answer that are validated by DS | |
2088 | * RRs from the list of validated keys to the list of | |
2089 | * validated keys. */ | |
2090 | ||
2091 | DNS_ANSWER_FOREACH_IFINDEX(rr, ifindex, t->answer) { | |
2092 | ||
96bb7673 | 2093 | r = dnssec_verify_dnskey_by_ds_search(rr, t->validated_keys); |
105e1512 LP |
2094 | if (r < 0) |
2095 | return r; | |
2096 | if (r == 0) | |
2097 | continue; | |
2098 | ||
2099 | /* If so, the DNSKEY is validated too. */ | |
2100 | r = dns_answer_add_extend(&t->validated_keys, rr, ifindex, DNS_ANSWER_AUTHENTICATED); | |
2101 | if (r < 0) | |
2102 | return r; | |
2103 | } | |
2104 | ||
2105 | return 0; | |
2106 | } | |
2107 | ||
2108 | static int dns_transaction_requires_rrsig(DnsTransaction *t, DnsResourceRecord *rr) { | |
56352fe9 LP |
2109 | int r; |
2110 | ||
2111 | assert(t); | |
2112 | assert(rr); | |
2113 | ||
105e1512 LP |
2114 | /* Checks if the RR we are looking for must be signed with an |
2115 | * RRSIG. This is used for positive responses. */ | |
24a5b982 | 2116 | |
b652d4a2 | 2117 | if (t->scope->dnssec_mode == DNSSEC_NO) |
105e1512 | 2118 | return false; |
56352fe9 | 2119 | |
105e1512 LP |
2120 | if (dns_type_is_pseudo(rr->key->type)) |
2121 | return -EINVAL; | |
56352fe9 | 2122 | |
8a516214 | 2123 | r = dns_transaction_negative_trust_anchor_lookup(t, DNS_RESOURCE_KEY_NAME(rr->key)); |
8e54f5d9 LP |
2124 | if (r < 0) |
2125 | return r; | |
2126 | if (r > 0) | |
2127 | return false; | |
2128 | ||
105e1512 | 2129 | switch (rr->key->type) { |
56352fe9 | 2130 | |
105e1512 LP |
2131 | case DNS_TYPE_RRSIG: |
2132 | /* RRSIGs are the signatures themselves, they need no signing. */ | |
2133 | return false; | |
2134 | ||
2135 | case DNS_TYPE_SOA: | |
2136 | case DNS_TYPE_NS: { | |
2137 | DnsTransaction *dt; | |
2138 | Iterator i; | |
2139 | ||
b63fca62 | 2140 | /* For SOA or NS RRs we look for a matching DS transaction */ |
105e1512 LP |
2141 | |
2142 | SET_FOREACH(dt, t->dnssec_transactions, i) { | |
2143 | ||
2144 | if (dt->key->class != rr->key->class) | |
2145 | continue; | |
2146 | if (dt->key->type != DNS_TYPE_DS) | |
2147 | continue; | |
2148 | ||
2149 | r = dns_name_equal(DNS_RESOURCE_KEY_NAME(dt->key), DNS_RESOURCE_KEY_NAME(rr->key)); | |
2150 | if (r < 0) | |
2151 | return r; | |
2152 | if (r == 0) | |
2153 | continue; | |
2154 | ||
2155 | /* We found a DS transactions for the SOA/NS | |
2156 | * RRs we are looking at. If it discovered signed DS | |
2157 | * RRs, then we need to be signed, too. */ | |
2158 | ||
097a2517 TA |
2159 | if (!dt->answer_authenticated) |
2160 | return false; | |
105e1512 | 2161 | |
097a2517 | 2162 | return dns_answer_match_key(dt->answer, dt->key, NULL); |
105e1512 LP |
2163 | } |
2164 | ||
2165 | /* We found nothing that proves this is safe to leave | |
2166 | * this unauthenticated, hence ask inist on | |
2167 | * authentication. */ | |
2168 | return true; | |
2169 | } | |
2170 | ||
b63fca62 | 2171 | case DNS_TYPE_DS: |
105e1512 LP |
2172 | case DNS_TYPE_CNAME: |
2173 | case DNS_TYPE_DNAME: { | |
2174 | const char *parent = NULL; | |
2175 | DnsTransaction *dt; | |
2176 | Iterator i; | |
2177 | ||
b63fca62 LP |
2178 | /* |
2179 | * CNAME/DNAME RRs cannot be located at a zone apex, hence look directly for the parent SOA. | |
2180 | * | |
2181 | * DS RRs are signed if the parent is signed, hence also look at the parent SOA | |
2182 | */ | |
105e1512 LP |
2183 | |
2184 | SET_FOREACH(dt, t->dnssec_transactions, i) { | |
2185 | ||
2186 | if (dt->key->class != rr->key->class) | |
2187 | continue; | |
2188 | if (dt->key->type != DNS_TYPE_SOA) | |
2189 | continue; | |
2190 | ||
2191 | if (!parent) { | |
2192 | parent = DNS_RESOURCE_KEY_NAME(rr->key); | |
2193 | r = dns_name_parent(&parent); | |
2194 | if (r < 0) | |
2195 | return r; | |
2196 | if (r == 0) { | |
b63fca62 LP |
2197 | if (rr->key->type == DNS_TYPE_DS) |
2198 | return true; | |
2199 | ||
105e1512 LP |
2200 | /* A CNAME/DNAME without a parent? That's sooo weird. */ |
2201 | log_debug("Transaction %" PRIu16 " claims CNAME/DNAME at root. Refusing.", t->id); | |
2202 | return -EBADMSG; | |
2203 | } | |
2204 | } | |
2205 | ||
2206 | r = dns_name_equal(DNS_RESOURCE_KEY_NAME(dt->key), parent); | |
2207 | if (r < 0) | |
2208 | return r; | |
2209 | if (r == 0) | |
2210 | continue; | |
2211 | ||
2212 | return t->answer_authenticated; | |
2213 | } | |
2214 | ||
2215 | return true; | |
2216 | } | |
2217 | ||
2218 | default: { | |
2219 | DnsTransaction *dt; | |
2220 | Iterator i; | |
2221 | ||
b63fca62 | 2222 | /* Any other kind of RR (including DNSKEY/NSEC/NSEC3). Let's see if our SOA lookup was authenticated */ |
105e1512 LP |
2223 | |
2224 | SET_FOREACH(dt, t->dnssec_transactions, i) { | |
2225 | ||
2226 | if (dt->key->class != rr->key->class) | |
2227 | continue; | |
2228 | if (dt->key->type != DNS_TYPE_SOA) | |
2229 | continue; | |
2230 | ||
2231 | r = dns_name_equal(DNS_RESOURCE_KEY_NAME(dt->key), DNS_RESOURCE_KEY_NAME(rr->key)); | |
2232 | if (r < 0) | |
2233 | return r; | |
2234 | if (r == 0) | |
2235 | continue; | |
2236 | ||
2237 | /* We found the transaction that was supposed to find | |
2238 | * the SOA RR for us. It was successful, but found no | |
2239 | * RR for us. This means we are not at a zone cut. In | |
2240 | * this case, we require authentication if the SOA | |
2241 | * lookup was authenticated too. */ | |
2242 | return t->answer_authenticated; | |
2243 | } | |
2244 | ||
2245 | return true; | |
2246 | }} | |
56352fe9 LP |
2247 | } |
2248 | ||
d33b6cf3 LP |
2249 | static int dns_transaction_in_private_tld(DnsTransaction *t, const DnsResourceKey *key) { |
2250 | DnsTransaction *dt; | |
2251 | const char *tld; | |
2252 | Iterator i; | |
2253 | int r; | |
2254 | ||
2255 | /* If DNSSEC downgrade mode is on, checks whether the | |
2256 | * specified RR is one level below a TLD we have proven not to | |
2257 | * exist. In such a case we assume that this is a private | |
2258 | * domain, and permit it. | |
2259 | * | |
2260 | * This detects cases like the Fritz!Box router networks. Each | |
2261 | * Fritz!Box router serves a private "fritz.box" zone, in the | |
2262 | * non-existing TLD "box". Requests for the "fritz.box" domain | |
2263 | * are served by the router itself, while requests for the | |
2264 | * "box" domain will result in NXDOMAIN. | |
2265 | * | |
2266 | * Note that this logic is unable to detect cases where a | |
2267 | * router serves a private DNS zone directly under | |
2268 | * non-existing TLD. In such a case we cannot detect whether | |
2269 | * the TLD is supposed to exist or not, as all requests we | |
2270 | * make for it will be answered by the router's zone, and not | |
2271 | * by the root zone. */ | |
2272 | ||
2273 | assert(t); | |
2274 | ||
2275 | if (t->scope->dnssec_mode != DNSSEC_ALLOW_DOWNGRADE) | |
2276 | return false; /* In strict DNSSEC mode what doesn't exist, doesn't exist */ | |
2277 | ||
2278 | tld = DNS_RESOURCE_KEY_NAME(key); | |
2279 | r = dns_name_parent(&tld); | |
2280 | if (r < 0) | |
2281 | return r; | |
2282 | if (r == 0) | |
2283 | return false; /* Already the root domain */ | |
2284 | ||
2285 | if (!dns_name_is_single_label(tld)) | |
2286 | return false; | |
2287 | ||
2288 | SET_FOREACH(dt, t->dnssec_transactions, i) { | |
2289 | ||
2290 | if (dt->key->class != key->class) | |
2291 | continue; | |
2292 | ||
2293 | r = dns_name_equal(DNS_RESOURCE_KEY_NAME(dt->key), tld); | |
2294 | if (r < 0) | |
2295 | return r; | |
2296 | if (r == 0) | |
2297 | continue; | |
2298 | ||
2299 | /* We found an auxiliary lookup we did for the TLD. If | |
2300 | * that returned with NXDOMAIN, we know the TLD didn't | |
2301 | * exist, and hence this might be a private zone. */ | |
2302 | ||
2303 | return dt->answer_rcode == DNS_RCODE_NXDOMAIN; | |
2304 | } | |
2305 | ||
2306 | return false; | |
2307 | } | |
2308 | ||
105e1512 LP |
2309 | static int dns_transaction_requires_nsec(DnsTransaction *t) { |
2310 | DnsTransaction *dt; | |
2311 | const char *name; | |
2312 | Iterator i; | |
2313 | int r; | |
56352fe9 LP |
2314 | |
2315 | assert(t); | |
2316 | ||
105e1512 LP |
2317 | /* Checks if we need to insist on NSEC/NSEC3 RRs for proving |
2318 | * this negative reply */ | |
56352fe9 | 2319 | |
b652d4a2 | 2320 | if (t->scope->dnssec_mode == DNSSEC_NO) |
105e1512 | 2321 | return false; |
56352fe9 | 2322 | |
105e1512 LP |
2323 | if (dns_type_is_pseudo(t->key->type)) |
2324 | return -EINVAL; | |
2325 | ||
8a516214 | 2326 | r = dns_transaction_negative_trust_anchor_lookup(t, DNS_RESOURCE_KEY_NAME(t->key)); |
8e54f5d9 LP |
2327 | if (r < 0) |
2328 | return r; | |
2329 | if (r > 0) | |
2330 | return false; | |
2331 | ||
d33b6cf3 LP |
2332 | r = dns_transaction_in_private_tld(t, t->key); |
2333 | if (r < 0) | |
2334 | return r; | |
2335 | if (r > 0) { | |
2336 | /* The lookup is from a TLD that is proven not to | |
2337 | * exist, and we are in downgrade mode, hence ignore | |
2338 | * that fact that we didn't get any NSEC RRs.*/ | |
2339 | ||
2340 | log_info("Detected a negative query %s in a private DNS zone, permitting unsigned response.", dns_transaction_key_string(t)); | |
2341 | return false; | |
2342 | } | |
2343 | ||
105e1512 LP |
2344 | name = DNS_RESOURCE_KEY_NAME(t->key); |
2345 | ||
2346 | if (IN_SET(t->key->type, DNS_TYPE_SOA, DNS_TYPE_NS, DNS_TYPE_DS)) { | |
2347 | ||
2348 | /* We got a negative reply for this SOA/NS lookup? If | |
2349 | * so, then we are not at a zone apex, and thus should | |
2350 | * look at the result of the parent SOA lookup. | |
2351 | * | |
2352 | * We got a negative reply for this DS lookup? DS RRs | |
2353 | * are signed when their parent zone is signed, hence | |
2354 | * also check the parent SOA in this case. */ | |
2355 | ||
2356 | r = dns_name_parent(&name); | |
56352fe9 LP |
2357 | if (r < 0) |
2358 | return r; | |
2359 | if (r == 0) | |
105e1512 LP |
2360 | return true; |
2361 | } | |
2362 | ||
2363 | /* For all other RRs we check the SOA on the same level to see | |
2364 | * if it's signed. */ | |
2365 | ||
2366 | SET_FOREACH(dt, t->dnssec_transactions, i) { | |
2367 | ||
2368 | if (dt->key->class != t->key->class) | |
2369 | continue; | |
2370 | if (dt->key->type != DNS_TYPE_SOA) | |
56352fe9 LP |
2371 | continue; |
2372 | ||
105e1512 | 2373 | r = dns_name_equal(DNS_RESOURCE_KEY_NAME(dt->key), name); |
56352fe9 LP |
2374 | if (r < 0) |
2375 | return r; | |
105e1512 LP |
2376 | if (r == 0) |
2377 | continue; | |
2378 | ||
2379 | return dt->answer_authenticated; | |
56352fe9 LP |
2380 | } |
2381 | ||
105e1512 LP |
2382 | /* If in doubt, require NSEC/NSEC3 */ |
2383 | return true; | |
56352fe9 LP |
2384 | } |
2385 | ||
94aa7071 LP |
2386 | static int dns_transaction_dnskey_authenticated(DnsTransaction *t, DnsResourceRecord *rr) { |
2387 | DnsResourceRecord *rrsig; | |
2388 | bool found = false; | |
2389 | int r; | |
2390 | ||
2391 | /* Checks whether any of the DNSKEYs used for the RRSIGs for | |
2392 | * the specified RRset is authenticated (i.e. has a matching | |
2393 | * DS RR). */ | |
2394 | ||
8a516214 | 2395 | r = dns_transaction_negative_trust_anchor_lookup(t, DNS_RESOURCE_KEY_NAME(rr->key)); |
8e54f5d9 LP |
2396 | if (r < 0) |
2397 | return r; | |
2398 | if (r > 0) | |
2399 | return false; | |
2400 | ||
94aa7071 LP |
2401 | DNS_ANSWER_FOREACH(rrsig, t->answer) { |
2402 | DnsTransaction *dt; | |
2403 | Iterator i; | |
2404 | ||
2405 | r = dnssec_key_match_rrsig(rr->key, rrsig); | |
2406 | if (r < 0) | |
2407 | return r; | |
2408 | if (r == 0) | |
2409 | continue; | |
2410 | ||
2411 | SET_FOREACH(dt, t->dnssec_transactions, i) { | |
2412 | ||
2413 | if (dt->key->class != rr->key->class) | |
2414 | continue; | |
2415 | ||
2416 | if (dt->key->type == DNS_TYPE_DNSKEY) { | |
2417 | ||
2418 | r = dns_name_equal(DNS_RESOURCE_KEY_NAME(dt->key), rrsig->rrsig.signer); | |
2419 | if (r < 0) | |
2420 | return r; | |
2421 | if (r == 0) | |
2422 | continue; | |
2423 | ||
2424 | /* OK, we found an auxiliary DNSKEY | |
2425 | * lookup. If that lookup is | |
2426 | * authenticated, report this. */ | |
2427 | ||
2428 | if (dt->answer_authenticated) | |
2429 | return true; | |
2430 | ||
2431 | found = true; | |
2432 | ||
2433 | } else if (dt->key->type == DNS_TYPE_DS) { | |
2434 | ||
2435 | r = dns_name_equal(DNS_RESOURCE_KEY_NAME(dt->key), rrsig->rrsig.signer); | |
2436 | if (r < 0) | |
2437 | return r; | |
2438 | if (r == 0) | |
2439 | continue; | |
2440 | ||
2441 | /* OK, we found an auxiliary DS | |
2442 | * lookup. If that lookup is | |
2443 | * authenticated and non-zero, we | |
2444 | * won! */ | |
2445 | ||
2446 | if (!dt->answer_authenticated) | |
2447 | return false; | |
2448 | ||
2449 | return dns_answer_match_key(dt->answer, dt->key, NULL); | |
2450 | } | |
2451 | } | |
2452 | } | |
2453 | ||
2454 | return found ? false : -ENXIO; | |
2455 | } | |
2456 | ||
b652d4a2 LP |
2457 | static int dns_transaction_known_signed(DnsTransaction *t, DnsResourceRecord *rr) { |
2458 | assert(t); | |
2459 | assert(rr); | |
2460 | ||
2461 | /* We know that the root domain is signed, hence if it appears | |
2462 | * not to be signed, there's a problem with the DNS server */ | |
2463 | ||
2464 | return rr->key->class == DNS_CLASS_IN && | |
2465 | dns_name_is_root(DNS_RESOURCE_KEY_NAME(rr->key)); | |
2466 | } | |
2467 | ||
0f87f3e8 LP |
2468 | static int dns_transaction_check_revoked_trust_anchors(DnsTransaction *t) { |
2469 | DnsResourceRecord *rr; | |
2470 | int r; | |
2471 | ||
2472 | assert(t); | |
2473 | ||
2474 | /* Maybe warn the user that we encountered a revoked DNSKEY | |
2475 | * for a key from our trust anchor. Note that we don't care | |
2476 | * whether the DNSKEY can be authenticated or not. It's | |
2477 | * sufficient if it is self-signed. */ | |
2478 | ||
2479 | DNS_ANSWER_FOREACH(rr, t->answer) { | |
d424da2a | 2480 | r = dns_trust_anchor_check_revoked(&t->scope->manager->trust_anchor, rr, t->answer); |
0f87f3e8 LP |
2481 | if (r < 0) |
2482 | return r; | |
2483 | } | |
2484 | ||
2485 | return 0; | |
2486 | } | |
2487 | ||
c9c72065 LP |
2488 | static int dns_transaction_invalidate_revoked_keys(DnsTransaction *t) { |
2489 | bool changed; | |
2490 | int r; | |
2491 | ||
2492 | assert(t); | |
2493 | ||
2494 | /* Removes all DNSKEY/DS objects from t->validated_keys that | |
2495 | * our trust anchors database considers revoked. */ | |
2496 | ||
2497 | do { | |
2498 | DnsResourceRecord *rr; | |
2499 | ||
2500 | changed = false; | |
2501 | ||
2502 | DNS_ANSWER_FOREACH(rr, t->validated_keys) { | |
2503 | r = dns_trust_anchor_is_revoked(&t->scope->manager->trust_anchor, rr); | |
2504 | if (r < 0) | |
2505 | return r; | |
2506 | if (r > 0) { | |
2507 | r = dns_answer_remove_by_rr(&t->validated_keys, rr); | |
2508 | if (r < 0) | |
2509 | return r; | |
2510 | ||
2511 | assert(r > 0); | |
2512 | changed = true; | |
2513 | break; | |
2514 | } | |
2515 | } | |
2516 | } while (changed); | |
2517 | ||
2518 | return 0; | |
2519 | } | |
2520 | ||
942eb2e7 LP |
2521 | static int dns_transaction_copy_validated(DnsTransaction *t) { |
2522 | DnsTransaction *dt; | |
2523 | Iterator i; | |
2524 | int r; | |
2525 | ||
2526 | assert(t); | |
2527 | ||
2528 | /* Copy all validated RRs from the auxiliary DNSSEC transactions into our set of validated RRs */ | |
2529 | ||
2530 | SET_FOREACH(dt, t->dnssec_transactions, i) { | |
2531 | ||
2532 | if (DNS_TRANSACTION_IS_LIVE(dt->state)) | |
2533 | continue; | |
2534 | ||
2535 | if (!dt->answer_authenticated) | |
2536 | continue; | |
2537 | ||
2538 | r = dns_answer_extend(&t->validated_keys, dt->answer); | |
2539 | if (r < 0) | |
2540 | return r; | |
2541 | } | |
2542 | ||
2543 | return 0; | |
2544 | } | |
2545 | ||
547973de LP |
2546 | int dns_transaction_validate_dnssec(DnsTransaction *t) { |
2547 | _cleanup_(dns_answer_unrefp) DnsAnswer *validated = NULL; | |
0c7bff0a LP |
2548 | enum { |
2549 | PHASE_DNSKEY, /* Phase #1, only validate DNSKEYs */ | |
2550 | PHASE_NSEC, /* Phase #2, only validate NSEC+NSEC3 */ | |
2551 | PHASE_ALL, /* Phase #3, validate everything else */ | |
2552 | } phase; | |
547973de | 2553 | DnsResourceRecord *rr; |
105e1512 | 2554 | DnsAnswerFlags flags; |
56352fe9 | 2555 | int r; |
547973de LP |
2556 | |
2557 | assert(t); | |
2558 | ||
2559 | /* We have now collected all DS and DNSKEY RRs in | |
2560 | * t->validated_keys, let's see which RRs we can now | |
2561 | * authenticate with that. */ | |
2562 | ||
b652d4a2 | 2563 | if (t->scope->dnssec_mode == DNSSEC_NO) |
547973de LP |
2564 | return 0; |
2565 | ||
2566 | /* Already validated */ | |
019036a4 | 2567 | if (t->answer_dnssec_result != _DNSSEC_RESULT_INVALID) |
547973de LP |
2568 | return 0; |
2569 | ||
105e1512 | 2570 | /* Our own stuff needs no validation */ |
547973de | 2571 | if (IN_SET(t->answer_source, DNS_TRANSACTION_ZONE, DNS_TRANSACTION_TRUST_ANCHOR)) { |
019036a4 | 2572 | t->answer_dnssec_result = DNSSEC_VALIDATED; |
547973de LP |
2573 | t->answer_authenticated = true; |
2574 | return 0; | |
2575 | } | |
2576 | ||
105e1512 LP |
2577 | /* Cached stuff is not affected by validation. */ |
2578 | if (t->answer_source != DNS_TRANSACTION_NETWORK) | |
2579 | return 0; | |
2580 | ||
92ec902a | 2581 | if (!dns_transaction_dnssec_supported_full(t)) { |
b652d4a2 LP |
2582 | /* The server does not support DNSSEC, or doesn't augment responses with RRSIGs. */ |
2583 | t->answer_dnssec_result = DNSSEC_INCOMPATIBLE_SERVER; | |
1e02e182 | 2584 | log_debug("Not validating response for %" PRIu16 ", server lacks DNSSEC support.", t->id); |
b652d4a2 LP |
2585 | return 0; |
2586 | } | |
2587 | ||
a5784c49 | 2588 | log_debug("Validating response from transaction %" PRIu16 " (%s).", t->id, dns_transaction_key_string(t)); |
547973de | 2589 | |
c9c72065 LP |
2590 | /* First, see if this response contains any revoked trust |
2591 | * anchors we care about */ | |
0f87f3e8 LP |
2592 | r = dns_transaction_check_revoked_trust_anchors(t); |
2593 | if (r < 0) | |
2594 | return r; | |
2595 | ||
942eb2e7 LP |
2596 | /* Third, copy all RRs we acquired successfully from auxiliary RRs over. */ |
2597 | r = dns_transaction_copy_validated(t); | |
2598 | if (r < 0) | |
2599 | return r; | |
2600 | ||
c9c72065 LP |
2601 | /* Second, see if there are DNSKEYs we already know a |
2602 | * validated DS for. */ | |
56352fe9 LP |
2603 | r = dns_transaction_validate_dnskey_by_ds(t); |
2604 | if (r < 0) | |
2605 | return r; | |
547973de | 2606 | |
942eb2e7 | 2607 | /* Fourth, remove all DNSKEY and DS RRs again that our trust |
c9c72065 LP |
2608 | * anchor says are revoked. After all we might have marked |
2609 | * some keys revoked above, but they might still be lingering | |
2610 | * in our validated_keys list. */ | |
2611 | r = dns_transaction_invalidate_revoked_keys(t); | |
2612 | if (r < 0) | |
2613 | return r; | |
2614 | ||
0c7bff0a | 2615 | phase = PHASE_DNSKEY; |
547973de | 2616 | for (;;) { |
0c7bff0a | 2617 | bool changed = false, have_nsec = false; |
547973de LP |
2618 | |
2619 | DNS_ANSWER_FOREACH(rr, t->answer) { | |
0c7bff0a | 2620 | DnsResourceRecord *rrsig = NULL; |
547973de LP |
2621 | DnssecResult result; |
2622 | ||
0c7bff0a LP |
2623 | switch (rr->key->type) { |
2624 | ||
2625 | case DNS_TYPE_RRSIG: | |
547973de LP |
2626 | continue; |
2627 | ||
0c7bff0a LP |
2628 | case DNS_TYPE_DNSKEY: |
2629 | /* We validate DNSKEYs only in the DNSKEY and ALL phases */ | |
2630 | if (phase == PHASE_NSEC) | |
2631 | continue; | |
2632 | break; | |
2633 | ||
2634 | case DNS_TYPE_NSEC: | |
2635 | case DNS_TYPE_NSEC3: | |
2636 | have_nsec = true; | |
2637 | ||
2638 | /* We validate NSEC/NSEC3 only in the NSEC and ALL phases */ | |
2639 | if (phase == PHASE_DNSKEY) | |
2640 | continue; | |
2641 | ||
2642 | break; | |
2643 | ||
2644 | default: | |
2645 | /* We validate all other RRs only in the ALL phases */ | |
2646 | if (phase != PHASE_ALL) | |
2647 | continue; | |
2648 | ||
2649 | break; | |
2650 | } | |
2651 | ||
2652 | r = dnssec_verify_rrset_search(t->answer, rr->key, t->validated_keys, USEC_INFINITY, &result, &rrsig); | |
547973de LP |
2653 | if (r < 0) |
2654 | return r; | |
2655 | ||
7b50eb2e | 2656 | log_debug("Looking at %s: %s", strna(dns_resource_record_to_string(rr)), dnssec_result_to_string(result)); |
547973de | 2657 | |
56352fe9 | 2658 | if (result == DNSSEC_VALIDATED) { |
547973de | 2659 | |
547973de LP |
2660 | if (rr->key->type == DNS_TYPE_DNSKEY) { |
2661 | /* If we just validated a | |
2662 | * DNSKEY RRset, then let's | |
2663 | * add these keys to the set | |
2664 | * of validated keys for this | |
2665 | * transaction. */ | |
2666 | ||
105e1512 | 2667 | r = dns_answer_copy_by_key(&t->validated_keys, t->answer, rr->key, DNS_ANSWER_AUTHENTICATED); |
547973de LP |
2668 | if (r < 0) |
2669 | return r; | |
c9c72065 LP |
2670 | |
2671 | /* some of the DNSKEYs we just | |
2672 | * added might already have | |
2673 | * been revoked, remove them | |
2674 | * again in that case. */ | |
2675 | r = dns_transaction_invalidate_revoked_keys(t); | |
2676 | if (r < 0) | |
2677 | return r; | |
547973de LP |
2678 | } |
2679 | ||
105e1512 LP |
2680 | /* Add the validated RRset to the new |
2681 | * list of validated RRsets, and | |
2682 | * remove it from the unvalidated | |
2683 | * RRsets. We mark the RRset as | |
2684 | * authenticated and cacheable. */ | |
2685 | r = dns_answer_move_by_key(&validated, &t->answer, rr->key, DNS_ANSWER_AUTHENTICATED|DNS_ANSWER_CACHEABLE); | |
547973de LP |
2686 | if (r < 0) |
2687 | return r; | |
2688 | ||
59c5b597 | 2689 | manager_dnssec_verdict(t->scope->manager, DNSSEC_SECURE, rr->key); |
a150ff5e | 2690 | |
56352fe9 | 2691 | /* Exit the loop, we dropped something from the answer, start from the beginning */ |
547973de LP |
2692 | changed = true; |
2693 | break; | |
f3cf586d | 2694 | } |
547973de | 2695 | |
0c7bff0a LP |
2696 | /* If we haven't read all DNSKEYs yet a negative result of the validation is irrelevant, as |
2697 | * there might be more DNSKEYs coming. Similar, if we haven't read all NSEC/NSEC3 RRs yet, we | |
2698 | * cannot do positive wildcard proofs yet, as those require the NSEC/NSEC3 RRs. */ | |
2699 | if (phase != PHASE_ALL) | |
f3cf586d | 2700 | continue; |
b652d4a2 | 2701 | |
0c7bff0a LP |
2702 | if (result == DNSSEC_VALIDATED_WILDCARD) { |
2703 | bool authenticated = false; | |
e926785a | 2704 | const char *source; |
0c7bff0a | 2705 | |
e926785a LP |
2706 | /* This RRset validated, but as a wildcard. This means we need to prove via NSEC/NSEC3 |
2707 | * that no matching non-wildcard RR exists.*/ | |
0c7bff0a | 2708 | |
e926785a | 2709 | /* First step, determine the source of synthesis */ |
97c67192 | 2710 | r = dns_resource_record_source(rrsig, &source); |
0c7bff0a LP |
2711 | if (r < 0) |
2712 | return r; | |
0c7bff0a | 2713 | |
e926785a LP |
2714 | r = dnssec_test_positive_wildcard( |
2715 | validated, | |
2716 | DNS_RESOURCE_KEY_NAME(rr->key), | |
2717 | source, | |
2718 | rrsig->rrsig.signer, | |
2719 | &authenticated); | |
0c7bff0a LP |
2720 | |
2721 | /* Unless the NSEC proof showed that the key really doesn't exist something is off. */ | |
372dd764 | 2722 | if (r == 0) |
0c7bff0a | 2723 | result = DNSSEC_INVALID; |
372dd764 LP |
2724 | else { |
2725 | r = dns_answer_move_by_key(&validated, &t->answer, rr->key, authenticated ? (DNS_ANSWER_AUTHENTICATED|DNS_ANSWER_CACHEABLE) : 0); | |
2726 | if (r < 0) | |
2727 | return r; | |
0c7bff0a | 2728 | |
59c5b597 | 2729 | manager_dnssec_verdict(t->scope->manager, authenticated ? DNSSEC_SECURE : DNSSEC_INSECURE, rr->key); |
0c7bff0a | 2730 | |
372dd764 LP |
2731 | /* Exit the loop, we dropped something from the answer, start from the beginning */ |
2732 | changed = true; | |
2733 | break; | |
2734 | } | |
0c7bff0a LP |
2735 | } |
2736 | ||
f3cf586d LP |
2737 | if (result == DNSSEC_NO_SIGNATURE) { |
2738 | r = dns_transaction_requires_rrsig(t, rr); | |
2739 | if (r < 0) | |
2740 | return r; | |
2741 | if (r == 0) { | |
2742 | /* Data does not require signing. In that case, just copy it over, | |
2743 | * but remember that this is by no means authenticated.*/ | |
2744 | r = dns_answer_move_by_key(&validated, &t->answer, rr->key, 0); | |
b652d4a2 LP |
2745 | if (r < 0) |
2746 | return r; | |
b652d4a2 | 2747 | |
59c5b597 | 2748 | manager_dnssec_verdict(t->scope->manager, DNSSEC_INSECURE, rr->key); |
f3cf586d LP |
2749 | changed = true; |
2750 | break; | |
2751 | } | |
b652d4a2 | 2752 | |
f3cf586d LP |
2753 | r = dns_transaction_known_signed(t, rr); |
2754 | if (r < 0) | |
2755 | return r; | |
2756 | if (r > 0) { | |
2757 | /* This is an RR we know has to be signed. If it isn't this means | |
2758 | * the server is not attaching RRSIGs, hence complain. */ | |
d33b6cf3 | 2759 | |
de54e62b | 2760 | dns_server_packet_rrsig_missing(t->server, t->current_feature_level); |
d33b6cf3 | 2761 | |
f3cf586d | 2762 | if (t->scope->dnssec_mode == DNSSEC_ALLOW_DOWNGRADE) { |
d33b6cf3 | 2763 | |
f3cf586d | 2764 | /* Downgrading is OK? If so, just consider the information unsigned */ |
d33b6cf3 LP |
2765 | |
2766 | r = dns_answer_move_by_key(&validated, &t->answer, rr->key, 0); | |
2767 | if (r < 0) | |
2768 | return r; | |
2769 | ||
59c5b597 | 2770 | manager_dnssec_verdict(t->scope->manager, DNSSEC_INSECURE, rr->key); |
d33b6cf3 LP |
2771 | changed = true; |
2772 | break; | |
2773 | } | |
f3cf586d LP |
2774 | |
2775 | /* Otherwise, fail */ | |
2776 | t->answer_dnssec_result = DNSSEC_INCOMPATIBLE_SERVER; | |
2777 | return 0; | |
94aa7071 LP |
2778 | } |
2779 | ||
f3cf586d LP |
2780 | r = dns_transaction_in_private_tld(t, rr->key); |
2781 | if (r < 0) | |
2782 | return r; | |
2783 | if (r > 0) { | |
2784 | _cleanup_free_ char *s = NULL; | |
94aa7071 | 2785 | |
f3cf586d LP |
2786 | /* The data is from a TLD that is proven not to exist, and we are in downgrade |
2787 | * mode, hence ignore the fact that this was not signed. */ | |
94aa7071 | 2788 | |
f3cf586d LP |
2789 | (void) dns_resource_key_to_string(rr->key, &s); |
2790 | log_info("Detected RRset %s is in a private DNS zone, permitting unsigned RRs.", strna(s ? strstrip(s) : NULL)); | |
94aa7071 | 2791 | |
f3cf586d LP |
2792 | r = dns_answer_move_by_key(&validated, &t->answer, rr->key, 0); |
2793 | if (r < 0) | |
2794 | return r; | |
a150ff5e | 2795 | |
59c5b597 | 2796 | manager_dnssec_verdict(t->scope->manager, DNSSEC_INSECURE, rr->key); |
f3cf586d LP |
2797 | changed = true; |
2798 | break; | |
105e1512 | 2799 | } |
f3cf586d | 2800 | } |
105e1512 | 2801 | |
f3cf586d LP |
2802 | if (IN_SET(result, |
2803 | DNSSEC_MISSING_KEY, | |
2804 | DNSSEC_SIGNATURE_EXPIRED, | |
2805 | DNSSEC_UNSUPPORTED_ALGORITHM)) { | |
a150ff5e | 2806 | |
f3cf586d LP |
2807 | r = dns_transaction_dnskey_authenticated(t, rr); |
2808 | if (r < 0 && r != -ENXIO) | |
547973de | 2809 | return r; |
f3cf586d LP |
2810 | if (r == 0) { |
2811 | /* The DNSKEY transaction was not authenticated, this means there's | |
2812 | * no DS for this, which means it's OK if no keys are found for this signature. */ | |
2813 | ||
2814 | r = dns_answer_move_by_key(&validated, &t->answer, rr->key, 0); | |
2815 | if (r < 0) | |
2816 | return r; | |
2817 | ||
59c5b597 | 2818 | manager_dnssec_verdict(t->scope->manager, DNSSEC_INSECURE, rr->key); |
f3cf586d LP |
2819 | changed = true; |
2820 | break; | |
547973de | 2821 | } |
f3cf586d | 2822 | } |
547973de | 2823 | |
f3cf586d LP |
2824 | r = dns_transaction_is_primary_response(t, rr); |
2825 | if (r < 0) | |
2826 | return r; | |
2827 | if (r > 0) { | |
43e6779a LP |
2828 | |
2829 | /* Look for a matching DNAME for this CNAME */ | |
2830 | r = dns_answer_has_dname_for_cname(t->answer, rr); | |
2831 | if (r < 0) | |
2832 | return r; | |
2833 | if (r == 0) { | |
2834 | /* Also look among the stuff we already validated */ | |
2835 | r = dns_answer_has_dname_for_cname(validated, rr); | |
2836 | if (r < 0) | |
2837 | return r; | |
2838 | } | |
2839 | ||
2840 | if (r == 0) { | |
59c5b597 LP |
2841 | if (IN_SET(result, |
2842 | DNSSEC_INVALID, | |
2843 | DNSSEC_SIGNATURE_EXPIRED, | |
2844 | DNSSEC_NO_SIGNATURE)) | |
2845 | manager_dnssec_verdict(t->scope->manager, DNSSEC_BOGUS, rr->key); | |
2846 | else /* DNSSEC_MISSING_KEY or DNSSEC_UNSUPPORTED_ALGORITHM */ | |
2847 | manager_dnssec_verdict(t->scope->manager, DNSSEC_INDETERMINATE, rr->key); | |
2848 | ||
43e6779a LP |
2849 | /* This is a primary response to our question, and it failed validation. That's |
2850 | * fatal. */ | |
2851 | t->answer_dnssec_result = result; | |
2852 | return 0; | |
2853 | } | |
2854 | ||
2855 | /* This is a primary response, but we do have a DNAME RR in the RR that can replay this | |
2856 | * CNAME, hence rely on that, and we can remove the CNAME in favour of it. */ | |
547973de | 2857 | } |
f3cf586d | 2858 | |
43e6779a | 2859 | /* This is just some auxiliary data. Just remove the RRset and continue. */ |
f3cf586d LP |
2860 | r = dns_answer_remove_by_key(&t->answer, rr->key); |
2861 | if (r < 0) | |
2862 | return r; | |
2863 | ||
2864 | /* Exit the loop, we dropped something from the answer, start from the beginning */ | |
2865 | changed = true; | |
2866 | break; | |
547973de LP |
2867 | } |
2868 | ||
0c7bff0a | 2869 | /* Restart the inner loop as long as we managed to achieve something */ |
547973de LP |
2870 | if (changed) |
2871 | continue; | |
2872 | ||
0c7bff0a LP |
2873 | if (phase == PHASE_DNSKEY && have_nsec) { |
2874 | /* OK, we processed all DNSKEYs, and there are NSEC/NSEC3 RRs, look at those now. */ | |
2875 | phase = PHASE_NSEC; | |
2876 | continue; | |
2877 | } | |
2878 | ||
2879 | if (phase != PHASE_ALL) { | |
2880 | /* OK, we processed all DNSKEYs and NSEC/NSEC3 RRs, look at all the rest now. Note that in this | |
2881 | * third phase we start to remove RRs we couldn't validate. */ | |
2882 | phase = PHASE_ALL; | |
56352fe9 | 2883 | continue; |
547973de LP |
2884 | } |
2885 | ||
56352fe9 | 2886 | /* We're done */ |
547973de LP |
2887 | break; |
2888 | } | |
2889 | ||
2890 | dns_answer_unref(t->answer); | |
2891 | t->answer = validated; | |
2892 | validated = NULL; | |
2893 | ||
72667f08 LP |
2894 | /* At this point the answer only contains validated |
2895 | * RRsets. Now, let's see if it actually answers the question | |
2896 | * we asked. If so, great! If it doesn't, then see if | |
2897 | * NSEC/NSEC3 can prove this. */ | |
105e1512 | 2898 | r = dns_transaction_has_positive_answer(t, &flags); |
72667f08 | 2899 | if (r > 0) { |
105e1512 LP |
2900 | /* Yes, it answers the question! */ |
2901 | ||
2902 | if (flags & DNS_ANSWER_AUTHENTICATED) { | |
2903 | /* The answer is fully authenticated, yay. */ | |
019036a4 | 2904 | t->answer_dnssec_result = DNSSEC_VALIDATED; |
105e1512 LP |
2905 | t->answer_rcode = DNS_RCODE_SUCCESS; |
2906 | t->answer_authenticated = true; | |
2907 | } else { | |
2908 | /* The answer is not fully authenticated. */ | |
019036a4 | 2909 | t->answer_dnssec_result = DNSSEC_UNSIGNED; |
105e1512 LP |
2910 | t->answer_authenticated = false; |
2911 | } | |
2912 | ||
72667f08 LP |
2913 | } else if (r == 0) { |
2914 | DnssecNsecResult nr; | |
ed29bfdc | 2915 | bool authenticated = false; |
72667f08 LP |
2916 | |
2917 | /* Bummer! Let's check NSEC/NSEC3 */ | |
0c7bff0a | 2918 | r = dnssec_nsec_test(t->answer, t->key, &nr, &authenticated, &t->answer_nsec_ttl); |
72667f08 LP |
2919 | if (r < 0) |
2920 | return r; | |
2921 | ||
2922 | switch (nr) { | |
2923 | ||
2924 | case DNSSEC_NSEC_NXDOMAIN: | |
2925 | /* NSEC proves the domain doesn't exist. Very good. */ | |
105e1512 | 2926 | log_debug("Proved NXDOMAIN via NSEC/NSEC3 for transaction %u (%s)", t->id, dns_transaction_key_string(t)); |
019036a4 | 2927 | t->answer_dnssec_result = DNSSEC_VALIDATED; |
72667f08 | 2928 | t->answer_rcode = DNS_RCODE_NXDOMAIN; |
ed29bfdc | 2929 | t->answer_authenticated = authenticated; |
7aa8ce98 | 2930 | |
59c5b597 | 2931 | manager_dnssec_verdict(t->scope->manager, authenticated ? DNSSEC_SECURE : DNSSEC_INSECURE, t->key); |
72667f08 LP |
2932 | break; |
2933 | ||
2934 | case DNSSEC_NSEC_NODATA: | |
2935 | /* NSEC proves that there's no data here, very good. */ | |
105e1512 | 2936 | log_debug("Proved NODATA via NSEC/NSEC3 for transaction %u (%s)", t->id, dns_transaction_key_string(t)); |
019036a4 | 2937 | t->answer_dnssec_result = DNSSEC_VALIDATED; |
72667f08 | 2938 | t->answer_rcode = DNS_RCODE_SUCCESS; |
ed29bfdc | 2939 | t->answer_authenticated = authenticated; |
7aa8ce98 | 2940 | |
59c5b597 | 2941 | manager_dnssec_verdict(t->scope->manager, authenticated ? DNSSEC_SECURE : DNSSEC_INSECURE, t->key); |
72667f08 LP |
2942 | break; |
2943 | ||
105e1512 LP |
2944 | case DNSSEC_NSEC_OPTOUT: |
2945 | /* NSEC3 says the data might not be signed */ | |
2946 | log_debug("Data is NSEC3 opt-out via NSEC/NSEC3 for transaction %u (%s)", t->id, dns_transaction_key_string(t)); | |
019036a4 | 2947 | t->answer_dnssec_result = DNSSEC_UNSIGNED; |
105e1512 | 2948 | t->answer_authenticated = false; |
7aa8ce98 | 2949 | |
59c5b597 | 2950 | manager_dnssec_verdict(t->scope->manager, DNSSEC_INSECURE, t->key); |
105e1512 LP |
2951 | break; |
2952 | ||
72667f08 LP |
2953 | case DNSSEC_NSEC_NO_RR: |
2954 | /* No NSEC data? Bummer! */ | |
105e1512 LP |
2955 | |
2956 | r = dns_transaction_requires_nsec(t); | |
2957 | if (r < 0) | |
2958 | return r; | |
7aa8ce98 | 2959 | if (r > 0) { |
019036a4 | 2960 | t->answer_dnssec_result = DNSSEC_NO_SIGNATURE; |
59c5b597 | 2961 | manager_dnssec_verdict(t->scope->manager, DNSSEC_BOGUS, t->key); |
7aa8ce98 | 2962 | } else { |
019036a4 | 2963 | t->answer_dnssec_result = DNSSEC_UNSIGNED; |
105e1512 | 2964 | t->answer_authenticated = false; |
59c5b597 | 2965 | manager_dnssec_verdict(t->scope->manager, DNSSEC_INSECURE, t->key); |
105e1512 LP |
2966 | } |
2967 | ||
2968 | break; | |
2969 | ||
2970 | case DNSSEC_NSEC_UNSUPPORTED_ALGORITHM: | |
2971 | /* We don't know the NSEC3 algorithm used? */ | |
019036a4 | 2972 | t->answer_dnssec_result = DNSSEC_UNSUPPORTED_ALGORITHM; |
59c5b597 | 2973 | manager_dnssec_verdict(t->scope->manager, DNSSEC_INDETERMINATE, t->key); |
72667f08 LP |
2974 | break; |
2975 | ||
2976 | case DNSSEC_NSEC_FOUND: | |
146035b3 | 2977 | case DNSSEC_NSEC_CNAME: |
72667f08 | 2978 | /* NSEC says it needs to be there, but we couldn't find it? Bummer! */ |
019036a4 | 2979 | t->answer_dnssec_result = DNSSEC_NSEC_MISMATCH; |
59c5b597 | 2980 | manager_dnssec_verdict(t->scope->manager, DNSSEC_BOGUS, t->key); |
72667f08 LP |
2981 | break; |
2982 | ||
2983 | default: | |
2984 | assert_not_reached("Unexpected NSEC result."); | |
2985 | } | |
2986 | } | |
2987 | ||
547973de LP |
2988 | return 1; |
2989 | } | |
2990 | ||
a5784c49 LP |
2991 | const char *dns_transaction_key_string(DnsTransaction *t) { |
2992 | assert(t); | |
2993 | ||
2994 | if (!t->key_string) { | |
2995 | if (dns_resource_key_to_string(t->key, &t->key_string) < 0) | |
2996 | return "n/a"; | |
2997 | } | |
2998 | ||
2999 | return strstrip(t->key_string); | |
3000 | } | |
3001 | ||
ec2c5e43 LP |
3002 | static const char* const dns_transaction_state_table[_DNS_TRANSACTION_STATE_MAX] = { |
3003 | [DNS_TRANSACTION_NULL] = "null", | |
3004 | [DNS_TRANSACTION_PENDING] = "pending", | |
547973de | 3005 | [DNS_TRANSACTION_VALIDATING] = "validating", |
3bbdc31d | 3006 | [DNS_TRANSACTION_RCODE_FAILURE] = "rcode-failure", |
ec2c5e43 LP |
3007 | [DNS_TRANSACTION_SUCCESS] = "success", |
3008 | [DNS_TRANSACTION_NO_SERVERS] = "no-servers", | |
3009 | [DNS_TRANSACTION_TIMEOUT] = "timeout", | |
3010 | [DNS_TRANSACTION_ATTEMPTS_MAX_REACHED] = "attempts-max-reached", | |
3011 | [DNS_TRANSACTION_INVALID_REPLY] = "invalid-reply", | |
7cc6ed7b | 3012 | [DNS_TRANSACTION_ERRNO] = "errno", |
ec2c5e43 | 3013 | [DNS_TRANSACTION_ABORTED] = "aborted", |
547973de | 3014 | [DNS_TRANSACTION_DNSSEC_FAILED] = "dnssec-failed", |
b2b796b8 | 3015 | [DNS_TRANSACTION_NO_TRUST_ANCHOR] = "no-trust-anchor", |
91adc4db | 3016 | [DNS_TRANSACTION_RR_TYPE_UNSUPPORTED] = "rr-type-unsupported", |
edbcc1fd | 3017 | [DNS_TRANSACTION_NETWORK_DOWN] = "network-down", |
0791110f | 3018 | [DNS_TRANSACTION_NOT_FOUND] = "not-found", |
ec2c5e43 LP |
3019 | }; |
3020 | DEFINE_STRING_TABLE_LOOKUP(dns_transaction_state, DnsTransactionState); | |
c3bc53e6 LP |
3021 | |
3022 | static const char* const dns_transaction_source_table[_DNS_TRANSACTION_SOURCE_MAX] = { | |
3023 | [DNS_TRANSACTION_NETWORK] = "network", | |
3024 | [DNS_TRANSACTION_CACHE] = "cache", | |
3025 | [DNS_TRANSACTION_ZONE] = "zone", | |
0d2cd476 | 3026 | [DNS_TRANSACTION_TRUST_ANCHOR] = "trust-anchor", |
c3bc53e6 LP |
3027 | }; |
3028 | DEFINE_STRING_TABLE_LOOKUP(dns_transaction_source, DnsTransactionSource); |