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86c152f2 | 1 | /* |
6edbf68a PL |
2 | * This file is part of PowerDNS or dnsdist. |
3 | * Copyright -- PowerDNS.COM B.V. and its contributors | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of version 2 of the GNU General Public License as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | * In addition, for the avoidance of any doubt, permission is granted to | |
10 | * link this program with OpenSSL and to (re)distribute the binaries | |
11 | * produced as the result of such linking. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
21 | */ | |
870a0fe4 AT |
22 | #ifdef HAVE_CONFIG_H |
23 | #include "config.h" | |
24 | #endif | |
fa8fd4d2 | 25 | |
86c152f2 | 26 | #include "arguments.hh" |
6dfff36f | 27 | #include "cachecleaner.hh" |
51e2144e | 28 | #include "dns_random.hh" |
6dfff36f RG |
29 | #include "dnsparser.hh" |
30 | #include "dnsrecords.hh" | |
376effcf | 31 | #include "ednssubnet.hh" |
6dfff36f RG |
32 | #include "logger.hh" |
33 | #include "lua-recursor4.hh" | |
ad42489c | 34 | #include "rec-lua-conf.hh" |
6dfff36f | 35 | #include "syncres.hh" |
4d2be65d | 36 | #include "validate-recursor.hh" |
6dfff36f | 37 | |
a712cb56 | 38 | thread_local SyncRes::ThreadLocalStorage SyncRes::t_sstorage; |
bb4bdbaf | 39 | |
3337c2f7 RG |
40 | std::unordered_set<DNSName> SyncRes::s_delegationOnly; |
41 | std::unique_ptr<NetmaskGroup> SyncRes::s_dontQuery{nullptr}; | |
42 | NetmaskGroup SyncRes::s_ednssubnets; | |
43 | SuffixMatchNode SyncRes::s_ednsdomains; | |
44 | string SyncRes::s_serverID; | |
45 | SyncRes::LogMode SyncRes::s_lm; | |
46 | ||
a9af3782 | 47 | unsigned int SyncRes::s_maxnegttl; |
c3e753c7 | 48 | unsigned int SyncRes::s_maxcachettl; |
3337c2f7 RG |
49 | unsigned int SyncRes::s_maxqperq; |
50 | unsigned int SyncRes::s_maxtotusec; | |
51 | unsigned int SyncRes::s_maxdepth; | |
52 | unsigned int SyncRes::s_minimumTTL; | |
1051f8a9 BH |
53 | unsigned int SyncRes::s_packetcachettl; |
54 | unsigned int SyncRes::s_packetcacheservfailttl; | |
628e2c7b PA |
55 | unsigned int SyncRes::s_serverdownmaxfails; |
56 | unsigned int SyncRes::s_serverdownthrottletime; | |
aebb81e4 | 57 | std::atomic<uint64_t> SyncRes::s_queries; |
58 | std::atomic<uint64_t> SyncRes::s_outgoingtimeouts; | |
59 | std::atomic<uint64_t> SyncRes::s_outgoing4timeouts; | |
60 | std::atomic<uint64_t> SyncRes::s_outgoing6timeouts; | |
61 | std::atomic<uint64_t> SyncRes::s_outqueries; | |
62 | std::atomic<uint64_t> SyncRes::s_tcpoutqueries; | |
63 | std::atomic<uint64_t> SyncRes::s_throttledqueries; | |
64 | std::atomic<uint64_t> SyncRes::s_dontqueries; | |
65 | std::atomic<uint64_t> SyncRes::s_nodelegated; | |
66 | std::atomic<uint64_t> SyncRes::s_unreachables; | |
e9f9b8ec RG |
67 | uint8_t SyncRes::s_ecsipv4limit; |
68 | uint8_t SyncRes::s_ecsipv6limit; | |
996c89cc | 69 | bool SyncRes::s_doIPv6; |
1051f8a9 | 70 | bool SyncRes::s_nopacketcache; |
01402d56 | 71 | bool SyncRes::s_rootNXTrust; |
3337c2f7 | 72 | bool SyncRes::s_noEDNS; |
c836dc19 | 73 | |
77499b05 | 74 | #define LOG(x) if(d_lm == Log) { L <<Logger::Warning << x; } else if(d_lm == Store) { d_trace << x; } |
728485ca | 75 | |
69cbdef9 | 76 | static void accountAuthLatency(int usec, int family) |
11adfdd3 | 77 | { |
7b75810e | 78 | if(family == AF_INET) { |
79 | if(usec < 1000) | |
80 | g_stats.auth4Answers0_1++; | |
81 | else if(usec < 10000) | |
82 | g_stats.auth4Answers1_10++; | |
83 | else if(usec < 100000) | |
84 | g_stats.auth4Answers10_100++; | |
85 | else if(usec < 1000000) | |
86 | g_stats.auth4Answers100_1000++; | |
87 | else | |
88 | g_stats.auth4AnswersSlow++; | |
89 | } else { | |
90 | if(usec < 1000) | |
91 | g_stats.auth6Answers0_1++; | |
92 | else if(usec < 10000) | |
93 | g_stats.auth6Answers1_10++; | |
94 | else if(usec < 100000) | |
95 | g_stats.auth6Answers10_100++; | |
96 | else if(usec < 1000000) | |
97 | g_stats.auth6Answers100_1000++; | |
98 | else | |
99 | g_stats.auth6AnswersSlow++; | |
100 | } | |
101 | ||
11adfdd3 | 102 | } |
103 | ||
4465e941 | 104 | |
ac0e821b | 105 | SyncRes::SyncRes(const struct timeval& now) : d_outqueries(0), d_tcpoutqueries(0), d_throttledqueries(0), d_timeouts(0), d_unreachables(0), |
30ee601a | 106 | d_totUsec(0), d_now(now), |
0b29b9c5 | 107 | d_cacheonly(false), d_doDNSSEC(false), d_doEDNS0(false), d_lm(s_lm) |
232f0877 | 108 | |
ac0e821b | 109 | { |
ac0e821b BH |
110 | } |
111 | ||
728485ca | 112 | /** everything begins here - this is the entry point just after receiving a packet */ |
e325f20c | 113 | int SyncRes::beginResolve(const DNSName &qname, const QType &qtype, uint16_t qclass, vector<DNSRecord>&ret) |
728485ca | 114 | { |
4d2be65d | 115 | vState state = Indeterminate; |
c836dc19 | 116 | s_queries++; |
3762e821 | 117 | d_wasVariable=false; |
9fc36e90 | 118 | d_wasOutOfBand=false; |
710af846 | 119 | |
4d2be65d RG |
120 | if (doSpecialNamesResolve(qname, qtype, qclass, ret)) { |
121 | d_queryValidationState = Secure; | |
db50a7f4 | 122 | return 0; |
4d2be65d | 123 | } |
db50a7f4 | 124 | |
fad4e1b2 | 125 | if( (qtype.getCode() == QType::AXFR) || (qtype.getCode() == QType::IXFR)) |
693dbe65 | 126 | return -1; |
710af846 | 127 | |
db50a7f4 PL |
128 | if(qclass==QClass::ANY) |
129 | qclass=QClass::IN; | |
130 | else if(qclass!=QClass::IN) | |
131 | return -1; | |
8171ab83 | 132 | |
db50a7f4 | 133 | set<GetBestNSAnswer> beenthere; |
ad75fdbd RG |
134 | SyncRes::zonesStates_t cuts; |
135 | int res=doResolve(qname, qtype, ret, 0, beenthere, state, cuts); | |
4d2be65d | 136 | d_queryValidationState = state; |
db50a7f4 PL |
137 | return res; |
138 | } | |
139 | ||
140 | /*! Handles all special, built-in names | |
141 | * Fills ret with an answer and returns true if it handled the query. | |
142 | * | |
d03c1b70 | 143 | * Handles the following queries (and their ANY variants): |
db50a7f4 PL |
144 | * |
145 | * - localhost. IN A | |
146 | * - localhost. IN AAAA | |
147 | * - 1.0.0.127.in-addr.arpa. IN PTR | |
148 | * - 1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa. IN PTR | |
149 | * - version.bind. CH TXT | |
150 | * - version.pdns. CH TXT | |
151 | * - id.server. CH TXT | |
db50a7f4 | 152 | */ |
6dfff36f | 153 | bool SyncRes::doSpecialNamesResolve(const DNSName &qname, const QType &qtype, const uint16_t qclass, vector<DNSRecord> &ret) |
db50a7f4 PL |
154 | { |
155 | static const DNSName arpa("1.0.0.127.in-addr.arpa."), ip6_arpa("1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa."), | |
156 | localhost("localhost."), versionbind("version.bind."), idserver("id.server."), versionpdns("version.pdns."); | |
157 | ||
158 | bool handled = false; | |
d03c1b70 | 159 | vector<pair<QType::typeenum, string> > answers; |
db50a7f4 | 160 | |
d03c1b70 PL |
161 | if ((qname == arpa || qname == ip6_arpa) && |
162 | qclass == QClass::IN) { | |
db50a7f4 | 163 | handled = true; |
d03c1b70 PL |
164 | if (qtype == QType::PTR || qtype == QType::ANY) |
165 | answers.push_back({QType::PTR, "localhost."}); | |
db50a7f4 PL |
166 | } |
167 | ||
d03c1b70 PL |
168 | if (qname == localhost && |
169 | qclass == QClass::IN) { | |
db50a7f4 | 170 | handled = true; |
d03c1b70 PL |
171 | if (qtype == QType::A || qtype == QType::ANY) |
172 | answers.push_back({QType::A, "127.0.0.1"}); | |
173 | if (qtype == QType::AAAA || qtype == QType::ANY) | |
174 | answers.push_back({QType::AAAA, "::1"}); | |
db50a7f4 PL |
175 | } |
176 | ||
d03c1b70 PL |
177 | if ((qname == versionbind || qname == idserver || qname == versionpdns) && |
178 | qclass == QClass::CHAOS) { | |
db50a7f4 | 179 | handled = true; |
d03c1b70 PL |
180 | if (qtype == QType::TXT || qtype == QType::ANY) { |
181 | if(qname == versionbind || qname == versionpdns) | |
182 | answers.push_back({QType::TXT, "\""+::arg()["version-string"]+"\""}); | |
183 | else | |
184 | answers.push_back({QType::TXT, "\""+s_serverID+"\""}); | |
185 | } | |
31ad43ab BH |
186 | } |
187 | ||
d03c1b70 | 188 | if (handled && !answers.empty()) { |
a9af3782 | 189 | ret.clear(); |
db50a7f4 PL |
190 | d_wasOutOfBand=true; |
191 | ||
e325f20c | 192 | DNSRecord dr; |
db50a7f4 | 193 | dr.d_name = qname; |
e693ff5a | 194 | dr.d_place = DNSResourceRecord::ANSWER; |
db50a7f4 PL |
195 | dr.d_class = qclass; |
196 | dr.d_ttl = 86400; | |
d03c1b70 PL |
197 | for (const auto& ans : answers) { |
198 | dr.d_type = ans.first; | |
6177a176 | 199 | dr.d_content = DNSRecordContent::mastermake(ans.first, qclass, ans.second); |
d03c1b70 PL |
200 | ret.push_back(dr); |
201 | } | |
a9af3782 | 202 | } |
710af846 | 203 | |
db50a7f4 | 204 | return handled; |
728485ca | 205 | } |
afbe2787 | 206 | |
db50a7f4 | 207 | |
ab5c053d | 208 | //! This is the 'out of band resolver', in other words, the authoritative server |
3337c2f7 | 209 | void SyncRes::AuthDomain::addSOA(std::vector<DNSRecord>& records) const |
e93c956b | 210 | { |
3337c2f7 RG |
211 | SyncRes::AuthDomain::records_t::const_iterator ziter = d_records.find(boost::make_tuple(getName(), QType::SOA)); |
212 | if (ziter != d_records.end()) { | |
213 | DNSRecord dr = *ziter; | |
214 | dr.d_place = DNSResourceRecord::AUTHORITY; | |
215 | records.push_back(dr); | |
5605c067 | 216 | } |
3337c2f7 RG |
217 | else { |
218 | // cerr<<qname<<": can't find SOA record '"<<getName()<<"' in our zone!"<<endl; | |
219 | } | |
220 | } | |
5605c067 | 221 | |
3337c2f7 RG |
222 | int SyncRes::AuthDomain::getRecords(const DNSName& qname, uint16_t qtype, std::vector<DNSRecord>& records) const |
223 | { | |
224 | int result = RCode::NoError; | |
225 | records.clear(); | |
5605c067 | 226 | |
3337c2f7 RG |
227 | // partial lookup |
228 | std::pair<records_t::const_iterator,records_t::const_iterator> range = d_records.equal_range(tie(qname)); | |
229 | ||
230 | SyncRes::AuthDomain::records_t::const_iterator ziter; | |
231 | bool somedata = false; | |
232 | ||
233 | for(ziter = range.first; ziter != range.second; ++ziter) { | |
234 | somedata = true; | |
235 | ||
236 | if(qtype == QType::ANY || ziter->d_type == qtype || ziter->d_type == QType::CNAME) { | |
237 | // let rest of nameserver do the legwork on this one | |
238 | records.push_back(*ziter); | |
239 | } | |
240 | else if (ziter->d_type == QType::NS && ziter->d_name.countLabels() > getName().countLabels()) { | |
241 | // we hit a delegation point! | |
242 | DNSRecord dr = *ziter; | |
39eb8051 | 243 | dr.d_place=DNSResourceRecord::AUTHORITY; |
3337c2f7 | 244 | records.push_back(dr); |
39eb8051 | 245 | } |
5605c067 | 246 | } |
3337c2f7 RG |
247 | |
248 | if (!records.empty()) { | |
249 | /* We have found an exact match, we're done */ | |
250 | // cerr<<qname<<": exact match in zone '"<<getName()<<"'"<<endl; | |
251 | return result; | |
5605c067 | 252 | } |
3337c2f7 RG |
253 | |
254 | if (somedata) { | |
255 | /* We have records for that name, but not of the wanted qtype */ | |
256 | // cerr<<qname<<": found record in '"<<getName()<<"', but nothing of the right type, sending SOA"<<endl; | |
257 | addSOA(records); | |
258 | ||
259 | return result; | |
9e9844e2 | 260 | } |
5605c067 | 261 | |
3337c2f7 | 262 | // cerr<<qname<<": nothing found so far in '"<<getName()<<"', trying wildcards"<<endl; |
c5c066bf | 263 | DNSName wcarddomain(qname); |
3337c2f7 RG |
264 | while(wcarddomain != getName() && wcarddomain.chopOff()) { |
265 | // cerr<<qname<<": trying '*."<<wcarddomain<<"' in "<<getName()<<endl; | |
266 | range = d_records.equal_range(boost::make_tuple(g_wildcarddnsname + wcarddomain)); | |
267 | if (range.first==range.second) | |
0d1e259a BH |
268 | continue; |
269 | ||
3337c2f7 RG |
270 | for(ziter = range.first; ziter != range.second; ++ziter) { |
271 | DNSRecord dr = *ziter; | |
0f05b02b | 272 | // if we hit a CNAME, just answer that - rest of recursor will do the needful & follow |
3337c2f7 | 273 | if(dr.d_type == qtype || qtype == QType::ANY || dr.d_type == QType::CNAME) { |
e325f20c | 274 | dr.d_name = qname; |
3337c2f7 RG |
275 | dr.d_place = DNSResourceRecord::ANSWER; |
276 | records.push_back(dr); | |
0d1e259a BH |
277 | } |
278 | } | |
3337c2f7 RG |
279 | |
280 | if (records.empty()) { | |
281 | addSOA(records); | |
282 | } | |
283 | ||
284 | // cerr<<qname<<": in '"<<getName()<<"', had wildcard match on '*."<<wcarddomain<<"'"<<endl; | |
285 | return result; | |
0d1e259a BH |
286 | } |
287 | ||
3337c2f7 | 288 | /* Nothing for this name, no wildcard, let's see if there is some NS */ |
c5c066bf | 289 | DNSName nsdomain(qname); |
3337c2f7 RG |
290 | while (nsdomain.chopOff() && nsdomain != getName()) { |
291 | range = d_records.equal_range(boost::make_tuple(nsdomain,QType::NS)); | |
292 | if(range.first == range.second) | |
5605c067 BH |
293 | continue; |
294 | ||
3337c2f7 RG |
295 | for(ziter = range.first; ziter != range.second; ++ziter) { |
296 | DNSRecord dr = *ziter; | |
297 | dr.d_place = DNSResourceRecord::AUTHORITY; | |
298 | records.push_back(dr); | |
5605c067 BH |
299 | } |
300 | } | |
3337c2f7 RG |
301 | |
302 | if(records.empty()) { | |
303 | // cerr<<qname<<": no NS match in zone '"<<getName()<<"' either, handing out SOA"<<endl; | |
304 | addSOA(records); | |
305 | result = RCode::NXDomain; | |
5605c067 | 306 | } |
5605c067 | 307 | |
3337c2f7 RG |
308 | return result; |
309 | } | |
310 | ||
311 | bool SyncRes::doOOBResolve(const AuthDomain& domain, const DNSName &qname, const QType &qtype, vector<DNSRecord>&ret, int& res) const | |
312 | { | |
313 | res = domain.getRecords(qname, qtype.getCode(), ret); | |
9e9844e2 | 314 | return true; |
e93c956b BH |
315 | } |
316 | ||
3337c2f7 RG |
317 | bool SyncRes::doOOBResolve(const DNSName &qname, const QType &qtype, vector<DNSRecord>&ret, unsigned int depth, int& res) |
318 | { | |
319 | string prefix; | |
320 | if(doLog()) { | |
321 | prefix=d_prefix; | |
322 | prefix.append(depth, ' '); | |
323 | } | |
324 | ||
325 | DNSName authdomain(qname); | |
326 | domainmap_t::const_iterator iter=getBestAuthZone(&authdomain); | |
327 | if(iter==t_sstorage.domainmap->end() || !iter->second.isAuth()) { | |
328 | LOG(prefix<<qname<<": auth storage has no zone for this query!"<<endl); | |
329 | return false; | |
330 | } | |
331 | ||
332 | LOG(prefix<<qname<<": auth storage has data, zone='"<<authdomain<<"'"<<endl); | |
333 | return doOOBResolve(iter->second, qname, qtype, ret, res); | |
334 | } | |
335 | ||
ff1872cf BH |
336 | void SyncRes::doEDNSDumpAndClose(int fd) |
337 | { | |
338 | FILE* fp=fdopen(fd, "w"); | |
a82f68f0 RG |
339 | if (!fp) { |
340 | return; | |
341 | } | |
ff1872cf | 342 | fprintf(fp,"IP Address\tMode\tMode last updated at\n"); |
a712cb56 | 343 | for(const auto& eds : t_sstorage.ednsstatus) { |
57769f13 | 344 | fprintf(fp, "%s\t%d\t%s", eds.first.toString().c_str(), (int)eds.second.mode, ctime(&eds.second.modeSetAt)); |
ff1872cf | 345 | } |
bb4bdbaf | 346 | |
ff1872cf BH |
347 | fclose(fp); |
348 | } | |
349 | ||
9065eb05 RG |
350 | uint64_t SyncRes::doDumpNSSpeeds(int fd) |
351 | { | |
352 | FILE* fp=fdopen(dup(fd), "w"); | |
353 | if(!fp) | |
354 | return 0; | |
355 | fprintf(fp, "; nsspeed dump from thread follows\n;\n"); | |
356 | uint64_t count=0; | |
357 | ||
a712cb56 | 358 | for(const auto& i : t_sstorage.nsSpeeds) |
9065eb05 RG |
359 | { |
360 | count++; | |
361 | fprintf(fp, "%s -> ", i.first.toString().c_str()); | |
362 | for(const auto& j : i.second.d_collection) | |
363 | { | |
364 | // typedef vector<pair<ComboAddress, DecayingEwma> > collection_t; | |
365 | fprintf(fp, "%s/%f ", j.first.toString().c_str(), j.second.peek()); | |
366 | } | |
367 | fprintf(fp, "\n"); | |
368 | } | |
369 | fclose(fp); | |
370 | return count; | |
371 | } | |
372 | ||
9d534f2a | 373 | /* so here is the story. First we complete the full resolution process for a domain name. And only THEN do we decide |
374 | to also do DNSSEC validation, which leads to new queries. To make this simple, we *always* ask for DNSSEC records | |
375 | so that if there are RRSIGs for a name, we'll have them. | |
376 | ||
377 | However, some hosts simply can't answer questions which ask for DNSSEC. This can manifest itself as: | |
378 | * No answer | |
379 | * FormErr | |
380 | * Nonsense answer | |
381 | ||
382 | The cause of "No answer" may be fragmentation, and it is tempting to probe if smaller answers would get through. | |
383 | Another cause of "No answer" may simply be a network condition. | |
384 | Nonsense answers are a clearer indication this host won't be able to do DNSSEC evah. | |
385 | ||
386 | Previous implementations have suffered from turning off DNSSEC questions for an authoritative server based on timeouts. | |
387 | A clever idea is to only turn off DNSSEC if we know a domain isn't signed anyhow. The problem with that really | |
388 | clever idea however is that at this point in PowerDNS, we may simply not know that yet. All the DNSSEC thinking happens | |
389 | elsewhere. It may not have happened yet. | |
390 | ||
391 | For now this means we can't be clever, but will turn off DNSSEC if you reply with FormError or gibberish. | |
392 | */ | |
393 | ||
69cbdef9 | 394 | int SyncRes::asyncresolveWrapper(const ComboAddress& ip, bool ednsMANDATORY, const DNSName& domain, int type, bool doTCP, bool sendRDQuery, struct timeval* now, boost::optional<Netmask>& srcmask, LWResult* res) const |
81883dcc BH |
395 | { |
396 | /* what is your QUEST? | |
57769f13 | 397 | the goal is to get as many remotes as possible on the highest level of EDNS support |
81883dcc BH |
398 | The levels are: |
399 | ||
81883dcc | 400 | 0) UNKNOWN Unknown state |
57769f13 | 401 | 1) EDNS: Honors EDNS0 |
402 | 2) EDNSIGNORANT: Ignores EDNS0, gives replies without EDNS0 | |
9d534f2a | 403 | 3) NOEDNS: Generates FORMERR/NOTIMP on EDNS queries |
81883dcc BH |
404 | |
405 | Everybody starts out assumed to be '0'. | |
57769f13 | 406 | If '0', send out EDNS0 |
407 | If you FORMERR us, go to '3', | |
408 | If no EDNS in response, go to '2' | |
409 | If '1', send out EDNS0 | |
410 | If FORMERR, downgrade to 3 | |
411 | If '2', keep on including EDNS0, see what happens | |
81883dcc | 412 | Same behaviour as 0 |
57769f13 | 413 | If '3', send bare queries |
81883dcc BH |
414 | */ |
415 | ||
bb4bdbaf | 416 | SyncRes::EDNSStatus* ednsstatus; |
a712cb56 | 417 | ednsstatus = &t_sstorage.ednsstatus[ip]; // does this include port? YES |
81883dcc | 418 | |
bb4bdbaf BH |
419 | if(ednsstatus->modeSetAt && ednsstatus->modeSetAt + 3600 < d_now.tv_sec) { |
420 | *ednsstatus=SyncRes::EDNSStatus(); | |
77499b05 | 421 | // cerr<<"Resetting EDNS Status for "<<ip.toString()<<endl); |
81883dcc BH |
422 | } |
423 | ||
bb4bdbaf | 424 | SyncRes::EDNSStatus::EDNSMode& mode=ednsstatus->mode; |
81883dcc | 425 | SyncRes::EDNSStatus::EDNSMode oldmode = mode; |
fe61f5d8 | 426 | int EDNSLevel = 0; |
4898a348 RG |
427 | auto luaconfsLocal = g_luaconfs.getLocal(); |
428 | ResolveContext ctx; | |
429 | #ifdef HAVE_PROTOBUF | |
430 | ctx.d_initialRequestId = d_initialRequestId; | |
431 | #endif | |
81883dcc BH |
432 | |
433 | int ret; | |
ff1872cf | 434 | for(int tries = 0; tries < 3; ++tries) { |
e325f20c | 435 | // cerr<<"Remote '"<<ip.toString()<<"' currently in mode "<<mode<<endl; |
57769f13 | 436 | |
9d534f2a | 437 | if(mode==EDNSStatus::NOEDNS) { |
81883dcc | 438 | g_stats.noEdnsOutQueries++; |
9d534f2a | 439 | EDNSLevel = 0; // level != mode |
81883dcc | 440 | } |
9d534f2a | 441 | else if(ednsMANDATORY || mode==EDNSStatus::UNKNOWN || mode==EDNSStatus::EDNSOK || mode==EDNSStatus::EDNSIGNORANT) |
442 | EDNSLevel = 1; | |
30ee601a RG |
443 | |
444 | if (d_asyncResolve) { | |
445 | ret = d_asyncResolve(ip, domain, type, doTCP, sendRDQuery, EDNSLevel, now, srcmask, ctx, luaconfsLocal->outgoingProtobufServer, res); | |
446 | } | |
447 | else { | |
448 | ret=asyncresolve(ip, domain, type, doTCP, sendRDQuery, EDNSLevel, now, srcmask, ctx, luaconfsLocal->outgoingProtobufServer, res); | |
449 | } | |
9d534f2a | 450 | if(ret < 0) { |
451 | return ret; // transport error, nothing to learn here | |
452 | } | |
57769f13 | 453 | |
9d534f2a | 454 | if(ret == 0) { // timeout, not doing anything with it now |
81883dcc BH |
455 | return ret; |
456 | } | |
57769f13 | 457 | else if(mode==EDNSStatus::UNKNOWN || mode==EDNSStatus::EDNSOK || mode == EDNSStatus::EDNSIGNORANT ) { |
458 | if(res->d_rcode == RCode::FormErr || res->d_rcode == RCode::NotImp) { | |
2189085d | 459 | // cerr<<"Downgrading to NOEDNS because of "<<RCode::to_s(res->d_rcode)<<" for query to "<<ip.toString()<<" for '"<<domain<<"'"<<endl; |
57769f13 | 460 | mode = EDNSStatus::NOEDNS; |
4957a608 | 461 | continue; |
81883dcc | 462 | } |
81883dcc | 463 | else if(!res->d_haveEDNS) { |
4957a608 BH |
464 | if(mode != EDNSStatus::EDNSIGNORANT) { |
465 | mode = EDNSStatus::EDNSIGNORANT; | |
2189085d | 466 | // cerr<<"We find that "<<ip.toString()<<" is an EDNS-ignorer for '"<<domain<<"', moving to mode 3"<<endl; |
57769f13 | 467 | } |
81883dcc | 468 | } |
57769f13 | 469 | else { |
470 | mode = EDNSStatus::EDNSOK; | |
e325f20c | 471 | // cerr<<"We find that "<<ip.toString()<<" is EDNS OK!"<<endl; |
81883dcc | 472 | } |
57769f13 | 473 | |
81883dcc | 474 | } |
12ce523e | 475 | if(oldmode != mode || !ednsstatus->modeSetAt) |
bb4bdbaf | 476 | ednsstatus->modeSetAt=d_now.tv_sec; |
e325f20c | 477 | // cerr<<"Result: ret="<<ret<<", EDNS-level: "<<EDNSLevel<<", haveEDNS: "<<res->d_haveEDNS<<", new mode: "<<mode<<endl; |
81883dcc BH |
478 | return ret; |
479 | } | |
480 | return ret; | |
481 | } | |
482 | ||
b88526ce PL |
483 | /*! This function will check the cache and go out to the internet if the answer is not in cache |
484 | * | |
485 | * \param qname The name we need an answer for | |
486 | * \param qtype | |
487 | * \param ret The vector of DNSRecords we need to fill with the answers | |
488 | * \param depth The recursion depth we are in | |
489 | * \param beenthere | |
490 | * \return DNS RCODE or -1 (Error) or -2 (RPZ hit) | |
491 | */ | |
ad75fdbd | 492 | int SyncRes::doResolve(const DNSName &qname, const QType &qtype, vector<DNSRecord>&ret, unsigned int depth, set<GetBestNSAnswer>& beenthere, vState& state, SyncRes::zonesStates_t& cuts) |
afbe2787 | 493 | { |
ded77b10 | 494 | string prefix; |
77499b05 | 495 | if(doLog()) { |
ded77b10 BH |
496 | prefix=d_prefix; |
497 | prefix.append(depth, ' '); | |
498 | } | |
b8470add | 499 | |
4d2be65d RG |
500 | LOG(prefix<<qname<<": Wants "<< (d_doDNSSEC ? "" : "NO ") << "DNSSEC processing, "<<(d_requireAuthData ? "" : "NO ")<<"auth data in query for "<<qtype.getName()<<endl); |
501 | ||
502 | state = Indeterminate; | |
710af846 | 503 | |
7c3398aa RG |
504 | if(s_maxdepth && depth > s_maxdepth) |
505 | throw ImmediateServFailException("More than "+std::to_string(s_maxdepth)+" (max-recursion-depth) levels of recursion needed while resolving "+qname.toLogString()); | |
506 | ||
f4df5e89 | 507 | int res=0; |
b88526ce PL |
508 | |
509 | // This is a difficult way of expressing "this is a normal query", i.e. not getRootNS. | |
0b29b9c5 | 510 | if(!(d_updatingRootNS && qtype.getCode()==QType::NS && qname.isRoot())) { |
115d07ad | 511 | if(d_cacheonly) { // very limited OOB support |
263f6a5a | 512 | LWResult lwr; |
2189085d | 513 | LOG(prefix<<qname<<": Recursion not requested for '"<<qname<<"|"<<qtype.getName()<<"', peeking at auth/forward zones"<<endl); |
c5c066bf | 514 | DNSName authname(qname); |
115d07ad | 515 | domainmap_t::const_iterator iter=getBestAuthZone(&authname); |
a712cb56 | 516 | if(iter != t_sstorage.domainmap->end()) { |
3337c2f7 | 517 | if(iter->second.isAuth()) { |
4957a608 | 518 | ret.clear(); |
9fc36e90 | 519 | d_wasOutOfBand = doOOBResolve(qname, qtype, ret, depth, res); |
4957a608 BH |
520 | return res; |
521 | } | |
522 | else { | |
3337c2f7 | 523 | const vector<ComboAddress>& servers = iter->second.d_servers; |
4957a608 | 524 | const ComboAddress remoteIP = servers.front(); |
2189085d | 525 | LOG(prefix<<qname<<": forwarding query to hardcoded nameserver '"<< remoteIP.toStringWithPort()<<"' for zone '"<<authname<<"'"<<endl); |
4957a608 | 526 | |
6148fa97 | 527 | boost::optional<Netmask> nm; |
12ce523e | 528 | res=asyncresolveWrapper(remoteIP, d_doDNSSEC, qname, qtype.getCode(), false, false, &d_now, nm, &lwr); |
4957a608 | 529 | // filter out the good stuff from lwr.result() |
ab33a095 RG |
530 | if (res == 1) { |
531 | for(const auto& rec : lwr.d_records) { | |
532 | if(rec.d_place == DNSResourceRecord::ANSWER) | |
533 | ret.push_back(rec); | |
534 | } | |
535 | return 0; | |
536 | } | |
537 | else { | |
538 | return RCode::ServFail; | |
4957a608 | 539 | } |
4957a608 | 540 | } |
115d07ad BH |
541 | } |
542 | } | |
543 | ||
ad75fdbd | 544 | if(!d_skipCNAMECheck && doCNAMECacheCheck(qname,qtype,ret,depth,res,state, cuts)) // will reroute us if needed |
c836dc19 | 545 | return res; |
710af846 | 546 | |
4d2be65d | 547 | if(doCacheCheck(qname,qtype,ret,depth,res,state)) // we done |
c836dc19 BH |
548 | return res; |
549 | } | |
afbe2787 | 550 | |
115d07ad | 551 | if(d_cacheonly) |
c836dc19 | 552 | return 0; |
728485ca | 553 | |
2189085d | 554 | LOG(prefix<<qname<<": No cache hit for '"<<qname<<"|"<<qtype.getName()<<"', trying to find an appropriate NS record"<<endl); |
710af846 | 555 | |
c5c066bf | 556 | DNSName subdomain(qname); |
d8049162 | 557 | if(qtype == QType::DS) subdomain.chopOff(); |
728485ca | 558 | |
fa1b87ff | 559 | NsSet nsset; |
7305df82 | 560 | bool flawedNSSet=false; |
97df07f8 | 561 | |
ad75fdbd | 562 | computeZoneCuts(cuts, qname, g_rootdnsname, depth); |
70b3fe7a | 563 | |
97df07f8 PD |
564 | // the two retries allow getBestNSNamesFromCache&co to reprime the root |
565 | // hints, in case they ever go missing | |
bdf40704 | 566 | for(int tries=0;tries<2 && nsset.empty();++tries) { |
891fbf88 | 567 | subdomain=getBestNSNamesFromCache(subdomain, qtype, nsset, &flawedNSSet, depth, beenthere); // pass beenthere to both occasions |
bdf40704 BH |
568 | } |
569 | ||
70b3fe7a RG |
570 | state = getValidationStatus(cuts, subdomain); |
571 | ||
4d2be65d RG |
572 | LOG("Initial validation status for "<<qname<<" inherited from "<<subdomain<<" is "<<vStates[state]<<endl); |
573 | ||
70b3fe7a | 574 | if(!(res=doResolveAt(nsset, subdomain, flawedNSSet, qname, qtype, ret, depth, beenthere, state, cuts))) |
728485ca | 575 | return 0; |
3ddb9247 | 576 | |
2189085d | 577 | LOG(prefix<<qname<<": failed (res="<<res<<")"<<endl); |
b8470add PL |
578 | |
579 | if (res == -2) | |
580 | return res; | |
581 | ||
20177d1d | 582 | return res<0 ? RCode::ServFail : res; |
afbe2787 BH |
583 | } |
584 | ||
c2567ad1 | 585 | #if 0 |
a67dd0cf | 586 | // for testing purposes |
fdf05fd4 BH |
587 | static bool ipv6First(const ComboAddress& a, const ComboAddress& b) |
588 | { | |
589 | return !(a.sin4.sin_family < a.sin4.sin_family); | |
590 | } | |
c2567ad1 | 591 | #endif |
fdf05fd4 | 592 | |
21f0f88b | 593 | /** This function explicitly goes out for A or AAAA addresses |
996c89cc | 594 | */ |
7c3398aa | 595 | vector<ComboAddress> SyncRes::getAddrs(const DNSName &qname, unsigned int depth, set<GetBestNSAnswer>& beenthere) |
75b49099 | 596 | { |
e325f20c | 597 | typedef vector<DNSRecord> res_t; |
bfea0d0b | 598 | res_t res; |
75b49099 | 599 | |
996c89cc BH |
600 | typedef vector<ComboAddress> ret_t; |
601 | ret_t ret; | |
75b49099 | 602 | |
d96e88da | 603 | QType type; |
24bb9b58 RG |
604 | bool oldRequireAuthData = d_requireAuthData; |
605 | d_requireAuthData = false; | |
92011b8f | 606 | |
607 | for(int j=1; j<2+s_doIPv6; j++) | |
d96e88da | 608 | { |
76c01aec | 609 | bool done=false; |
76c01aec PD |
610 | switch(j) { |
611 | case 0: | |
612 | type = QType::ANY; | |
613 | break; | |
614 | case 1: | |
615 | type = QType::A; | |
616 | break; | |
617 | case 2: | |
618 | type = QType::AAAA; | |
619 | break; | |
620 | } | |
d96e88da | 621 | |
4d2be65d | 622 | vState newState = Indeterminate; |
ad75fdbd RG |
623 | zonesStates_t cuts; |
624 | if(!doResolve(qname, type, res,depth+1, beenthere, newState, cuts) && !res.empty()) { // this consults cache, OR goes out | |
d96e88da | 625 | for(res_t::const_iterator i=res.begin(); i!= res.end(); ++i) { |
e325f20c | 626 | if(i->d_type == QType::A || i->d_type == QType::AAAA) { |
627 | if(auto rec = std::dynamic_pointer_cast<ARecordContent>(i->d_content)) | |
628 | ret.push_back(rec->getCA(53)); | |
dd079764 RG |
629 | else if(auto aaaarec = std::dynamic_pointer_cast<AAAARecordContent>(i->d_content)) |
630 | ret.push_back(aaaarec->getCA(53)); | |
92011b8f | 631 | done=true; |
d96e88da | 632 | } |
42724edf | 633 | } |
f4df5e89 | 634 | } |
710af846 | 635 | if(done) { |
60c9a54f | 636 | if(j==1 && s_doIPv6) { // we got an A record, see if we have some AAAA lying around |
e325f20c | 637 | vector<DNSRecord> cset; |
24bb9b58 | 638 | if(t_RC->get(d_now.tv_sec, qname, QType(QType::AAAA), false, &cset, d_requestor) > 0) { |
e325f20c | 639 | for(auto k=cset.cbegin();k!=cset.cend();++k) { |
640 | if(k->d_ttl > (unsigned int)d_now.tv_sec ) { | |
ba3c54cb RG |
641 | if (auto drc = std::dynamic_pointer_cast<AAAARecordContent>(k->d_content)) { |
642 | ComboAddress ca=drc->getCA(53); | |
643 | ret.push_back(ca); | |
644 | } | |
60c9a54f | 645 | } |
646 | } | |
647 | } | |
648 | } | |
649 | break; | |
650 | } | |
bfea0d0b | 651 | } |
710af846 | 652 | |
24bb9b58 RG |
653 | d_requireAuthData = oldRequireAuthData; |
654 | ||
996c89cc | 655 | if(ret.size() > 1) { |
51e2144e | 656 | random_shuffle(ret.begin(), ret.end(), dns_random); |
996c89cc | 657 | |
ae4d8cf1 | 658 | // move 'best' address for this nameserver name up front |
a712cb56 | 659 | nsspeeds_t::iterator best = t_sstorage.nsSpeeds.find(qname); |
996c89cc | 660 | |
a712cb56 | 661 | if(best != t_sstorage.nsSpeeds.end()) |
710af846 | 662 | for(ret_t::iterator i=ret.begin(); i != ret.end(); ++i) { |
4957a608 BH |
663 | if(*i==best->second.d_best) { // got the fastest one |
664 | if(i!=ret.begin()) { | |
665 | *i=*ret.begin(); | |
666 | *ret.begin()=best->second.d_best; | |
667 | } | |
668 | break; | |
669 | } | |
996c89cc BH |
670 | } |
671 | } | |
fdf05fd4 | 672 | |
728485ca | 673 | return ret; |
75b49099 BH |
674 | } |
675 | ||
7c3398aa | 676 | void SyncRes::getBestNSFromCache(const DNSName &qname, const QType& qtype, vector<DNSRecord>& bestns, bool* flawedNSSet, unsigned int depth, set<GetBestNSAnswer>& beenthere) |
86c152f2 | 677 | { |
c5c066bf PD |
678 | string prefix; |
679 | DNSName subdomain(qname); | |
77499b05 | 680 | if(doLog()) { |
ded77b10 BH |
681 | prefix=d_prefix; |
682 | prefix.append(depth, ' '); | |
683 | } | |
75b49099 | 684 | bestns.clear(); |
2b1b4054 | 685 | bool brokeloop; |
75b49099 | 686 | do { |
2b1b4054 | 687 | brokeloop=false; |
2189085d | 688 | LOG(prefix<<qname<<": Checking if we have NS in cache for '"<<subdomain<<"'"<<endl); |
e325f20c | 689 | vector<DNSRecord> ns; |
7305df82 | 690 | *flawedNSSet = false; |
4d2be65d | 691 | |
2b984251 | 692 | if(t_RC->get(d_now.tv_sec, subdomain, QType(QType::NS), false, &ns, d_requestor) > 0) { |
e325f20c | 693 | for(auto k=ns.cbegin();k!=ns.cend(); ++k) { |
694 | if(k->d_ttl > (unsigned int)d_now.tv_sec ) { | |
695 | vector<DNSRecord> aset; | |
4957a608 | 696 | |
e325f20c | 697 | const DNSRecord& dr=*k; |
ba3c54cb RG |
698 | auto nrr = getRR<NSRecordContent>(dr); |
699 | if(nrr && (!nrr->getNS().isPartOf(subdomain) || t_RC->get(d_now.tv_sec, nrr->getNS(), s_doIPv6 ? QType(QType::ADDR) : QType(QType::A), | |
24bb9b58 | 700 | false, doLog() ? &aset : nullptr, d_requestor) > 5)) { |
e325f20c | 701 | bestns.push_back(dr); |
2189085d PL |
702 | LOG(prefix<<qname<<": NS (with ip, or non-glue) in cache for '"<<subdomain<<"' -> '"<<nrr->getNS()<<"'"<<endl); |
703 | LOG(prefix<<qname<<": within bailiwick: "<< nrr->getNS().isPartOf(subdomain)); | |
4957a608 | 704 | if(!aset.empty()) { |
e325f20c | 705 | LOG(", in cache, ttl="<<(unsigned int)(((time_t)aset.begin()->d_ttl- d_now.tv_sec ))<<endl); |
4957a608 BH |
706 | } |
707 | else { | |
77499b05 | 708 | LOG(", not in cache / did not look at cache"<<endl); |
4957a608 BH |
709 | } |
710 | } | |
711 | else { | |
712 | *flawedNSSet=true; | |
e325f20c | 713 | LOG(prefix<<qname<<": NS in cache for '"<<subdomain<<"', but needs glue ("<<nrr->getNS()<<") which we miss or is expired"<<endl); |
4957a608 BH |
714 | } |
715 | } | |
afbe2787 | 716 | } |
4d2be65d | 717 | |
75b49099 | 718 | if(!bestns.empty()) { |
4957a608 | 719 | GetBestNSAnswer answer; |
891fbf88 | 720 | answer.qname=qname; |
721 | answer.qtype=qtype.getCode(); | |
e325f20c | 722 | for(const auto& dr : bestns) |
ba3c54cb | 723 | answer.bestns.insert(make_pair(dr.d_name, getRR<NSRecordContent>(dr)->getNS())); |
891fbf88 | 724 | |
4957a608 | 725 | if(beenthere.count(answer)) { |
2b1b4054 | 726 | brokeloop=true; |
2189085d | 727 | LOG(prefix<<qname<<": We have NS in cache for '"<<subdomain<<"' but part of LOOP (already seen "<<answer.qname<<")! Trying less specific NS"<<endl); |
e325f20c | 728 | ; |
77499b05 BH |
729 | if(doLog()) |
730 | for( set<GetBestNSAnswer>::const_iterator j=beenthere.begin();j!=beenthere.end();++j) { | |
2b1b4054 | 731 | bool neo = !(*j< answer || answer<*j); |
2189085d | 732 | LOG(prefix<<qname<<": beenthere"<<(neo?"*":"")<<": "<<j->qname<<"|"<<DNSRecordContent::NumberToType(j->qtype)<<" ("<<(unsigned int)j->bestns.size()<<")"<<endl); |
77499b05 | 733 | } |
4957a608 BH |
734 | bestns.clear(); |
735 | } | |
736 | else { | |
6576051d | 737 | beenthere.insert(answer); |
2189085d | 738 | LOG(prefix<<qname<<": We have NS in cache for '"<<subdomain<<"' (flawedNSSet="<<*flawedNSSet<<")"<<endl); |
4957a608 BH |
739 | return; |
740 | } | |
75b49099 | 741 | } |
afbe2787 | 742 | } |
2189085d | 743 | LOG(prefix<<qname<<": no valid/useful NS in cache for '"<<subdomain<<"'"<<endl); |
4d2be65d | 744 | |
52683ca3 | 745 | if(subdomain.isRoot() && !brokeloop) { |
7836f7b4 | 746 | // We lost the root NS records |
3ddb9247 | 747 | primeHints(); |
2189085d | 748 | LOG(prefix<<qname<<": reprimed the root"<<endl); |
0b29b9c5 RG |
749 | /* let's prevent an infinite loop */ |
750 | if (!d_updatingRootNS) { | |
751 | getRootNS(d_now, d_asyncResolve); | |
752 | } | |
6576051d | 753 | } |
4d2be65d | 754 | } while(subdomain.chopOff()); |
75b49099 BH |
755 | } |
756 | ||
69cbdef9 | 757 | SyncRes::domainmap_t::const_iterator SyncRes::getBestAuthZone(DNSName* qname) const |
5605c067 BH |
758 | { |
759 | SyncRes::domainmap_t::const_iterator ret; | |
760 | do { | |
a712cb56 RG |
761 | ret=t_sstorage.domainmap->find(*qname); |
762 | if(ret!=t_sstorage.domainmap->end()) | |
5605c067 | 763 | break; |
c5c066bf | 764 | }while(qname->chopOff()); |
5605c067 BH |
765 | return ret; |
766 | } | |
288f4aa9 | 767 | |
7bf26383 | 768 | /** doesn't actually do the work, leaves that to getBestNSFromCache */ |
7c3398aa | 769 | DNSName SyncRes::getBestNSNamesFromCache(const DNSName &qname, const QType& qtype, NsSet& nsset, bool* flawedNSSet, unsigned int depth, set<GetBestNSAnswer>&beenthere) |
75b49099 | 770 | { |
c5c066bf PD |
771 | DNSName subdomain(qname); |
772 | DNSName authdomain(qname); | |
3ddb9247 | 773 | |
5605c067 | 774 | domainmap_t::const_iterator iter=getBestAuthZone(&authdomain); |
a712cb56 | 775 | if(iter!=t_sstorage.domainmap->end()) { |
3337c2f7 | 776 | if( iter->second.isAuth() ) |
fa1b87ff PL |
777 | // this gets picked up in doResolveAt, the empty DNSName, combined with the |
778 | // empty vector means 'we are auth for this zone' | |
779 | nsset.insert({DNSName(), {{}, false}}); | |
2e5ae2b2 | 780 | else { |
fa1b87ff PL |
781 | // Again, picked up in doResolveAt. An empty DNSName, combined with a |
782 | // non-empty vector of ComboAddresses means 'this is a forwarded domain' | |
6dfff36f | 783 | // This is actually picked up in retrieveAddressesForNS called from doResolveAt. |
3337c2f7 | 784 | nsset.insert({DNSName(), {iter->second.d_servers, iter->second.shouldRecurse() }}); |
2e5ae2b2 | 785 | } |
5605c067 BH |
786 | return authdomain; |
787 | } | |
788 | ||
e325f20c | 789 | vector<DNSRecord> bestns; |
891fbf88 | 790 | getBestNSFromCache(subdomain, qtype, bestns, flawedNSSet, depth, beenthere); |
75b49099 | 791 | |
e325f20c | 792 | for(auto k=bestns.cbegin() ; k != bestns.cend(); ++k) { |
fa1b87ff PL |
793 | // The actual resolver code will not even look at the ComboAddress or bool |
794 | nsset.insert({std::dynamic_pointer_cast<NSRecordContent>(k->d_content)->getNS(), {{}, false}}); | |
e325f20c | 795 | if(k==bestns.cbegin()) |
796 | subdomain=k->d_name; | |
86c152f2 | 797 | } |
75b49099 | 798 | return subdomain; |
afbe2787 BH |
799 | } |
800 | ||
ad75fdbd | 801 | bool SyncRes::doCNAMECacheCheck(const DNSName &qname, const QType &qtype, vector<DNSRecord>& ret, unsigned int depth, int &res, vState& state, SyncRes::zonesStates_t& cuts) |
afbe2787 | 802 | { |
ded77b10 | 803 | string prefix; |
77499b05 | 804 | if(doLog()) { |
710af846 | 805 | prefix=d_prefix; |
ded77b10 BH |
806 | prefix.append(depth, ' '); |
807 | } | |
36f5e3db | 808 | |
40de2910 | 809 | if((depth>9 && d_outqueries>10 && d_throttledqueries>5) || depth > 15) { |
2189085d | 810 | LOG(prefix<<qname<<": recursing (CNAME or other indirection) too deep, depth="<<depth<<endl); |
c6644fc5 BH |
811 | res=RCode::ServFail; |
812 | return true; | |
813 | } | |
3ddb9247 | 814 | |
2189085d | 815 | LOG(prefix<<qname<<": Looking for CNAME cache hit of '"<<qname<<"|CNAME"<<"'"<<endl); |
e325f20c | 816 | vector<DNSRecord> cset; |
1f77f479 | 817 | vector<std::shared_ptr<RRSIGRecordContent>> signatures; |
2b984251 RG |
818 | vector<std::shared_ptr<DNSRecord>> authorityRecs; |
819 | if(t_RC->get(d_now.tv_sec, qname, QType(QType::CNAME), d_requireAuthData, &cset, d_requestor, d_doDNSSEC ? &signatures : nullptr, d_doDNSSEC ? &authorityRecs : nullptr, &d_wasVariable, &state) > 0) { | |
36c5ee42 | 820 | |
e325f20c | 821 | for(auto j=cset.cbegin() ; j != cset.cend() ; ++j) { |
822 | if(j->d_ttl>(unsigned int) d_now.tv_sec) { | |
4d2be65d | 823 | LOG(prefix<<qname<<": Found cache CNAME hit for '"<< qname << "|CNAME" <<"' to '"<<j->d_content->getZoneRepresentation()<<"', validation state is "<<vStates[state]<<endl); |
e325f20c | 824 | DNSRecord dr=*j; |
825 | dr.d_ttl-=d_now.tv_sec; | |
826 | ret.push_back(dr); | |
1f77f479 | 827 | |
4d2be65d RG |
828 | for(const auto& signature : signatures) { |
829 | DNSRecord sigdr; | |
830 | sigdr.d_type=QType::RRSIG; | |
831 | sigdr.d_name=qname; | |
832 | sigdr.d_ttl=j->d_ttl - d_now.tv_sec; | |
833 | sigdr.d_content=signature; | |
834 | sigdr.d_place=DNSResourceRecord::ANSWER; | |
835 | sigdr.d_class=QClass::IN; | |
836 | ret.push_back(sigdr); | |
837 | } | |
1f77f479 | 838 | |
2b984251 RG |
839 | for(const auto& rec : authorityRecs) { |
840 | DNSRecord dr(*rec); | |
841 | dr.d_ttl=j->d_ttl - d_now.tv_sec; | |
842 | ret.push_back(dr); | |
843 | } | |
844 | ||
f8e7daf8 | 845 | if(qtype != QType::CNAME) { // perhaps they really wanted a CNAME! |
4957a608 | 846 | set<GetBestNSAnswer>beenthere; |
4d2be65d RG |
847 | |
848 | vState cnameState = Indeterminate; | |
ad75fdbd | 849 | res=doResolve(std::dynamic_pointer_cast<CNAMERecordContent>(j->d_content)->getTarget(), qtype, ret, depth+1, beenthere, cnameState, cuts); |
4d2be65d RG |
850 | LOG("Updating validation state for response to "<<qname<<" from "<<vStates[state]<<" with the state from the CNAME quest: "<<vStates[cnameState]<<endl); |
851 | updateValidationState(state, cnameState); | |
4957a608 BH |
852 | } |
853 | else | |
854 | res=0; | |
4d2be65d | 855 | |
4957a608 | 856 | return true; |
ac539791 BH |
857 | } |
858 | } | |
afbe2787 | 859 | } |
2189085d | 860 | LOG(prefix<<qname<<": No CNAME cache hit of '"<< qname << "|CNAME" <<"' found"<<endl); |
75b49099 BH |
861 | return false; |
862 | } | |
863 | ||
6909b8c5 PL |
864 | /*! |
865 | * Convience function to push the records from records into ret with a new TTL | |
866 | * | |
867 | * \param records DNSRecords that need to go into ret | |
868 | * \param ttl The new TTL for these records | |
869 | * \param ret The vector of DNSRecords that should contian the records with the modified TTL | |
870 | */ | |
871 | static void addTTLModifiedRecords(const vector<DNSRecord>& records, const uint32_t ttl, vector<DNSRecord>& ret) { | |
39ce10b2 PL |
872 | for (const auto& rec : records) { |
873 | DNSRecord r(rec); | |
874 | r.d_ttl = ttl; | |
875 | ret.push_back(r); | |
876 | } | |
877 | } | |
878 | ||
e325f20c | 879 | |
4d2be65d | 880 | bool SyncRes::doCacheCheck(const DNSName &qname, const QType &qtype, vector<DNSRecord>&ret, unsigned int depth, int &res, vState& state) |
75b49099 | 881 | { |
fd8bc993 | 882 | bool giveNegative=false; |
710af846 | 883 | |
be718669 | 884 | string prefix; |
77499b05 | 885 | if(doLog()) { |
ded77b10 BH |
886 | prefix=d_prefix; |
887 | prefix.append(depth, ' '); | |
888 | } | |
afbe2787 | 889 | |
30e9bd93 | 890 | // sqname and sqtype are used contain 'higher' names if we have them (e.g. powerdns.com|SOA when we find a negative entry for doesnotexists.powerdns.com|A) |
c5c066bf | 891 | DNSName sqname(qname); |
288f4aa9 | 892 | QType sqt(qtype); |
092f210a | 893 | uint32_t sttl=0; |
2189085d | 894 | // cout<<"Lookup for '"<<qname<<"|"<<qtype.getName()<<"' -> "<<getLastLabel(qname)<<endl; |
3ddb9247 | 895 | |
64a8b6a1 | 896 | DNSName authname(qname); |
4d2be65d | 897 | vState cachedState; |
129bb0c3 RG |
898 | bool wasForwardedOrAuth = false; |
899 | bool wasAuth = false; | |
900 | domainmap_t::const_iterator iter=getBestAuthZone(&authname); | |
a712cb56 | 901 | if(iter != t_sstorage.domainmap->end()) { |
129bb0c3 RG |
902 | wasForwardedOrAuth = true; |
903 | const vector<ComboAddress>& servers = iter->second.d_servers; | |
904 | if(servers.empty()) { | |
905 | wasAuth = true; | |
906 | } | |
907 | } | |
39ce10b2 | 908 | NegCache::NegCacheEntry ne; |
64a8b6a1 | 909 | |
710af846 | 910 | if(s_rootNXTrust && |
a712cb56 | 911 | t_sstorage.negcache.getRootNXTrust(qname, d_now, ne) && |
39ce10b2 PL |
912 | ne.d_auth.isRoot() && |
913 | !(wasForwardedOrAuth && !authname.isRoot())) { // when forwarding, the root may only neg-cache if it was forwarded to. | |
914 | sttl = ne.d_ttd - d_now.tv_sec; | |
915 | LOG(prefix<<qname<<": Entire name '"<<qname<<"', is negatively cached via '"<<ne.d_auth<<"' & '"<<ne.d_name<<"' for another "<<sttl<<" seconds"<<endl); | |
3ddb9247 | 916 | res = RCode::NXDomain; |
39ce10b2 | 917 | giveNegative = true; |
4d2be65d | 918 | cachedState = ne.d_validationState; |
01402d56 | 919 | } |
a712cb56 | 920 | else if (t_sstorage.negcache.get(qname, qtype, d_now, ne) && |
39ce10b2 PL |
921 | !(wasForwardedOrAuth && ne.d_auth != authname)) { // Only the authname nameserver can neg cache entries |
922 | res = 0; | |
923 | sttl = ne.d_ttd - d_now.tv_sec; | |
924 | giveNegative = true; | |
4d2be65d | 925 | cachedState = ne.d_validationState; |
39ce10b2 PL |
926 | if(ne.d_qtype.getCode()) { |
927 | LOG(prefix<<qname<<": "<<qtype.getName()<<" is negatively cached via '"<<ne.d_auth<<"' for another "<<sttl<<" seconds"<<endl); | |
928 | res = RCode::NoError; | |
fd8bc993 | 929 | } |
39ce10b2 PL |
930 | else { |
931 | LOG(prefix<<qname<<": Entire name '"<<qname<<"', is negatively cached via '"<<ne.d_auth<<"' for another "<<sttl<<" seconds"<<endl); | |
932 | res = RCode::NXDomain; | |
933 | } | |
934 | if(d_doDNSSEC) { | |
935 | addTTLModifiedRecords(ne.DNSSECRecords.records, sttl, ret); | |
936 | addTTLModifiedRecords(ne.DNSSECRecords.signatures, sttl, ret); | |
937 | } | |
938 | } | |
939 | ||
940 | if (giveNegative) { | |
941 | // Transplant SOA to the returned packet | |
942 | addTTLModifiedRecords(ne.authoritySOA.records, sttl, ret); | |
943 | if(d_doDNSSEC) | |
944 | addTTLModifiedRecords(ne.authoritySOA.signatures, sttl, ret); | |
4d2be65d RG |
945 | |
946 | LOG("Updating validation state with negative cache content for "<<qname<<" to "<<vStates[cachedState]<<endl); | |
947 | state = cachedState; | |
39ce10b2 | 948 | return true; |
fd8bc993 | 949 | } |
39ce10b2 | 950 | |
e325f20c | 951 | vector<DNSRecord> cset; |
75b49099 | 952 | bool found=false, expired=false; |
57769f13 | 953 | vector<std::shared_ptr<RRSIGRecordContent>> signatures; |
2b984251 | 954 | vector<std::shared_ptr<DNSRecord>> authorityRecs; |
57769f13 | 955 | uint32_t ttl=0; |
2b984251 | 956 | if(t_RC->get(d_now.tv_sec, sqname, sqt, d_requireAuthData, &cset, d_requestor, d_doDNSSEC ? &signatures : nullptr, d_doDNSSEC ? &authorityRecs : nullptr, &d_wasVariable, &cachedState) > 0) { |
2189085d | 957 | LOG(prefix<<sqname<<": Found cache hit for "<<sqt.getName()<<": "); |
e325f20c | 958 | for(auto j=cset.cbegin() ; j != cset.cend() ; ++j) { |
959 | LOG(j->d_content->getZoneRepresentation()); | |
960 | if(j->d_ttl>(unsigned int) d_now.tv_sec) { | |
961 | DNSRecord dr=*j; | |
962 | ttl = (dr.d_ttl-=d_now.tv_sec); | |
e325f20c | 963 | ret.push_back(dr); |
964 | LOG("[ttl="<<dr.d_ttl<<"] "); | |
4957a608 | 965 | found=true; |
ac539791 | 966 | } |
75b49099 | 967 | else { |
77499b05 | 968 | LOG("[expired] "); |
4957a608 | 969 | expired=true; |
75b49099 | 970 | } |
afbe2787 | 971 | } |
57769f13 | 972 | |
973 | for(const auto& signature : signatures) { | |
e325f20c | 974 | DNSRecord dr; |
975 | dr.d_type=QType::RRSIG; | |
976 | dr.d_name=sqname; | |
977 | dr.d_ttl=ttl; | |
978 | dr.d_content=signature; | |
39ce10b2 | 979 | dr.d_place = DNSResourceRecord::ANSWER; |
4d2be65d | 980 | dr.d_class=QClass::IN; |
e325f20c | 981 | ret.push_back(dr); |
57769f13 | 982 | } |
2b984251 RG |
983 | |
984 | for(const auto& rec : authorityRecs) { | |
985 | DNSRecord dr(*rec); | |
986 | dr.d_ttl=ttl; | |
987 | ret.push_back(dr); | |
988 | } | |
989 | ||
77499b05 | 990 | LOG(endl); |
f4df5e89 | 991 | if(found && !expired) { |
4d2be65d | 992 | if (!giveNegative) |
4957a608 | 993 | res=0; |
129bb0c3 | 994 | d_wasOutOfBand = wasAuth; |
4d2be65d RG |
995 | LOG("Updating validation state with cache content for "<<qname<<" to "<<vStates[cachedState]<<endl); |
996 | state = cachedState; | |
75b49099 | 997 | return true; |
f4df5e89 | 998 | } |
75b49099 | 999 | else |
2189085d | 1000 | LOG(prefix<<qname<<": cache had only stale entries"<<endl); |
afbe2787 | 1001 | } |
f4df5e89 | 1002 | |
75b49099 BH |
1003 | return false; |
1004 | } | |
afbe2787 | 1005 | |
69cbdef9 | 1006 | bool SyncRes::moreSpecificThan(const DNSName& a, const DNSName &b) const |
75b49099 | 1007 | { |
6a1010f7 | 1008 | return (a.isPartOf(b) && a.countLabels() > b.countLabels()); |
afbe2787 BH |
1009 | } |
1010 | ||
d8d0bb8f | 1011 | struct speedOrder |
eefd15f9 | 1012 | { |
3ddb9247 PD |
1013 | speedOrder(map<DNSName,double> &speeds) : d_speeds(speeds) {} |
1014 | bool operator()(const DNSName &a, const DNSName &b) const | |
c3d9d009 BH |
1015 | { |
1016 | return d_speeds[a] < d_speeds[b]; | |
c3d9d009 | 1017 | } |
3ddb9247 | 1018 | map<DNSName, double>& d_speeds; |
c3d9d009 BH |
1019 | }; |
1020 | ||
fa1b87ff | 1021 | inline vector<DNSName> SyncRes::shuffleInSpeedOrder(NsSet &tnameservers, const string &prefix) |
afbe2787 | 1022 | { |
e8b23f3b | 1023 | vector<DNSName> rnameservers; |
5ea6f7de | 1024 | rnameservers.reserve(tnameservers.size()); |
e8b23f3b | 1025 | for(const auto& tns:tnameservers) { |
88490c03 | 1026 | rnameservers.push_back(tns.first); |
21f0f88b | 1027 | } |
e8b23f3b | 1028 | map<DNSName, double> speeds; |
461df9d2 | 1029 | |
e8b23f3b | 1030 | for(const auto& val: rnameservers) { |
79b8cdcc | 1031 | double speed; |
a712cb56 | 1032 | speed=t_sstorage.nsSpeeds[val].get(&d_now); |
21f0f88b | 1033 | speeds[val]=speed; |
eefd15f9 | 1034 | } |
51e2144e | 1035 | random_shuffle(rnameservers.begin(),rnameservers.end(), dns_random); |
996c89cc BH |
1036 | speedOrder so(speeds); |
1037 | stable_sort(rnameservers.begin(),rnameservers.end(), so); | |
710af846 | 1038 | |
77499b05 BH |
1039 | if(doLog()) { |
1040 | LOG(prefix<<"Nameservers: "); | |
e325f20c | 1041 | for(vector<DNSName>::const_iterator i=rnameservers.begin();i!=rnameservers.end();++i) { |
3ddb9247 | 1042 | if(i!=rnameservers.begin()) { |
77499b05 BH |
1043 | LOG(", "); |
1044 | if(!((i-rnameservers.begin())%3)) { | |
1045 | LOG(endl<<prefix<<" "); | |
1046 | } | |
d8d0bb8f | 1047 | } |
34dcd30c | 1048 | LOG((i->empty() ? string("<empty>") : i->toString())<<"(" << (boost::format("%0.2f") % (speeds[*i]/1000.0)).str() <<"ms)"); |
d8d0bb8f | 1049 | } |
77499b05 | 1050 | LOG(endl); |
d8d0bb8f | 1051 | } |
728485ca | 1052 | return rnameservers; |
afbe2787 BH |
1053 | } |
1054 | ||
bf7e4a70 BH |
1055 | static bool magicAddrMatch(const QType& query, const QType& answer) |
1056 | { | |
1057 | if(query.getCode() != QType::ADDR) | |
1058 | return false; | |
1059 | return answer.getCode() == QType::A || answer.getCode() == QType::AAAA; | |
1060 | } | |
7738a23f | 1061 | |
2b984251 RG |
1062 | static const set<uint16_t> nsecTypes = {QType::NSEC, QType::NSEC3}; |
1063 | ||
39ce10b2 PL |
1064 | /* Fills the authoritySOA and DNSSECRecords fields from ne with those found in the records |
1065 | * | |
1066 | * \param records The records to parse for the authority SOA and NSEC(3) records | |
1067 | * \param ne The NegCacheEntry to be filled out (will not be cleared, only appended to | |
1068 | */ | |
1069 | static void harvestNXRecords(const vector<DNSRecord>& records, NegCache::NegCacheEntry& ne) { | |
620db2c8 | 1070 | for(const auto& rec : records) { |
39ce10b2 PL |
1071 | if(rec.d_place != DNSResourceRecord::AUTHORITY) |
1072 | // RFC 4035 section 3.1.3. indicates that NSEC records MUST be placed in | |
1073 | // the AUTHORITY section. Section 3.1.1 indicates that that RRSIGs for | |
1074 | // records MUST be in the same section as the records they cover. | |
1075 | // Hence, we ignore all records outside of the AUTHORITY section. | |
1076 | continue; | |
1077 | ||
620db2c8 | 1078 | if(rec.d_type == QType::RRSIG) { |
39ce10b2 PL |
1079 | auto rrsig = getRR<RRSIGRecordContent>(rec); |
1080 | if(rrsig) { | |
1081 | if(rrsig->d_type == QType::SOA) { | |
1082 | ne.authoritySOA.signatures.push_back(rec); | |
1083 | } | |
1084 | if(nsecTypes.count(rrsig->d_type)) { | |
1085 | ne.DNSSECRecords.signatures.push_back(rec); | |
1086 | } | |
1087 | } | |
1088 | continue; | |
1089 | } | |
1090 | if(rec.d_type == QType::SOA) { | |
1091 | ne.authoritySOA.records.push_back(rec); | |
1092 | continue; | |
1093 | } | |
1094 | if(nsecTypes.count(rec.d_type)) { | |
1095 | ne.DNSSECRecords.records.push_back(rec); | |
1096 | continue; | |
620db2c8 | 1097 | } |
620db2c8 | 1098 | } |
620db2c8 | 1099 | } |
1100 | ||
4d2be65d RG |
1101 | static cspmap_t harvestCSPFromNE(const NegCache::NegCacheEntry& ne) |
1102 | { | |
1103 | cspmap_t cspmap; | |
1104 | for(const auto& rec : ne.DNSSECRecords.signatures) { | |
1105 | if(rec.d_type == QType::RRSIG) { | |
1106 | auto rrc = getRR<RRSIGRecordContent>(rec); | |
1107 | if (rrc) { | |
1108 | cspmap[{rec.d_name,rrc->d_type}].signatures.push_back(rrc); | |
1109 | } | |
1110 | } | |
1111 | } | |
1112 | for(const auto& rec : ne.DNSSECRecords.records) { | |
1113 | cspmap[{rec.d_name, rec.d_type}].records.push_back(rec.d_content); | |
1114 | } | |
1115 | return cspmap; | |
1116 | } | |
1117 | ||
39ce10b2 PL |
1118 | // TODO remove after processRecords is fixed! |
1119 | // Adds the RRSIG for the SOA and the NSEC(3) + RRSIGs to ret | |
620db2c8 | 1120 | static void addNXNSECS(vector<DNSRecord>&ret, const vector<DNSRecord>& records) |
1121 | { | |
39ce10b2 PL |
1122 | NegCache::NegCacheEntry ne; |
1123 | harvestNXRecords(records, ne); | |
1124 | ret.insert(ret.end(), ne.authoritySOA.signatures.begin(), ne.authoritySOA.signatures.end()); | |
1125 | ret.insert(ret.end(), ne.DNSSECRecords.records.begin(), ne.DNSSECRecords.records.end()); | |
1126 | ret.insert(ret.end(), ne.DNSSECRecords.signatures.begin(), ne.DNSSECRecords.signatures.end()); | |
620db2c8 | 1127 | } |
1128 | ||
69cbdef9 | 1129 | bool SyncRes::nameserversBlockedByRPZ(const DNSFilterEngine& dfe, const NsSet& nameservers) |
26ca3513 RG |
1130 | { |
1131 | if(d_wantsRPZ) { | |
1132 | for (auto const &ns : nameservers) { | |
69cbdef9 | 1133 | d_appliedPolicy = dfe.getProcessingPolicy(ns.first, d_discardedPolicies); |
26ca3513 RG |
1134 | if (d_appliedPolicy.d_kind != DNSFilterEngine::PolicyKind::NoAction) { // client query needs an RPZ response |
1135 | LOG(", however nameserver "<<ns.first<<" was blocked by RPZ policy '"<<(d_appliedPolicy.d_name ? *d_appliedPolicy.d_name : "")<<"'"<<endl); | |
1136 | return true; | |
1137 | } | |
1138 | ||
1139 | // Traverse all IP addresses for this NS to see if they have an RPN NSIP policy | |
1140 | for (auto const &address : ns.second.first) { | |
69cbdef9 | 1141 | d_appliedPolicy = dfe.getProcessingPolicy(address, d_discardedPolicies); |
26ca3513 RG |
1142 | if (d_appliedPolicy.d_kind != DNSFilterEngine::PolicyKind::NoAction) { // client query needs an RPZ response |
1143 | LOG(", however nameserver "<<ns.first<<" IP address "<<address.toString()<<" was blocked by RPZ policy '"<<(d_appliedPolicy.d_name ? *d_appliedPolicy.d_name : "")<<"'"<<endl); | |
1144 | return true; | |
1145 | } | |
1146 | } | |
1147 | } | |
1148 | } | |
1149 | return false; | |
1150 | } | |
1151 | ||
69cbdef9 | 1152 | bool SyncRes::nameserverIPBlockedByRPZ(const DNSFilterEngine& dfe, const ComboAddress& remoteIP) |
26ca3513 RG |
1153 | { |
1154 | if (d_wantsRPZ) { | |
69cbdef9 | 1155 | d_appliedPolicy = dfe.getProcessingPolicy(remoteIP, d_discardedPolicies); |
26ca3513 RG |
1156 | if (d_appliedPolicy.d_kind != DNSFilterEngine::PolicyKind::NoAction) { |
1157 | LOG(" (blocked by RPZ policy '"+(d_appliedPolicy.d_name ? *d_appliedPolicy.d_name : "")+"')"); | |
1158 | return true; | |
1159 | } | |
1160 | } | |
1161 | return false; | |
1162 | } | |
1163 | ||
1164 | vector<ComboAddress> SyncRes::retrieveAddressesForNS(const std::string& prefix, const DNSName& qname, vector<DNSName >::const_iterator& tns, const unsigned int depth, set<GetBestNSAnswer>& beenthere, const vector<DNSName >& rnameservers, NsSet& nameservers, bool& sendRDQuery, bool& pierceDontQuery, bool& flawedNSSet) | |
1165 | { | |
1166 | vector<ComboAddress> result; | |
1167 | ||
1168 | if(!tns->empty()) { | |
1169 | LOG(prefix<<qname<<": Trying to resolve NS '"<<*tns<< "' ("<<1+tns-rnameservers.begin()<<"/"<<(unsigned int)rnameservers.size()<<")"<<endl); | |
1170 | result = getAddrs(*tns, depth+2, beenthere); | |
1171 | pierceDontQuery=false; | |
1172 | } | |
1173 | else { | |
1174 | LOG(prefix<<qname<<": Domain has hardcoded nameserver"); | |
1175 | ||
1176 | result = nameservers[*tns].first; | |
1177 | if(result.size() > 1) { | |
1178 | LOG("s"); | |
1179 | } | |
1180 | LOG(endl); | |
1181 | ||
1182 | sendRDQuery = nameservers[*tns].second; | |
1183 | pierceDontQuery=true; | |
1184 | } | |
1185 | return result; | |
1186 | } | |
1187 | ||
1188 | bool SyncRes::throttledOrBlocked(const std::string& prefix, const ComboAddress& remoteIP, const DNSName& qname, const QType& qtype, bool pierceDontQuery) | |
1189 | { | |
a712cb56 | 1190 | if(t_sstorage.throttle.shouldThrottle(d_now.tv_sec, boost::make_tuple(remoteIP, "", 0))) { |
26ca3513 RG |
1191 | LOG(prefix<<qname<<": server throttled "<<endl); |
1192 | s_throttledqueries++; d_throttledqueries++; | |
1193 | return true; | |
1194 | } | |
a712cb56 | 1195 | else if(t_sstorage.throttle.shouldThrottle(d_now.tv_sec, boost::make_tuple(remoteIP, qname, qtype.getCode()))) { |
6dfff36f | 1196 | LOG(prefix<<qname<<": query throttled "<<remoteIP.toString()<<", "<<qname<<"; "<<qtype.getName()<<endl); |
26ca3513 RG |
1197 | s_throttledqueries++; d_throttledqueries++; |
1198 | return true; | |
1199 | } | |
9065eb05 | 1200 | else if(!pierceDontQuery && s_dontQuery && s_dontQuery->match(&remoteIP)) { |
26ca3513 RG |
1201 | LOG(prefix<<qname<<": not sending query to " << remoteIP.toString() << ", blocked by 'dont-query' setting" << endl); |
1202 | s_dontqueries++; | |
1203 | return true; | |
1204 | } | |
1205 | return false; | |
1206 | } | |
1207 | ||
4d2be65d RG |
1208 | bool SyncRes::validationEnabled() const |
1209 | { | |
8455425c | 1210 | return g_dnssecmode != DNSSECMode::Off && g_dnssecmode != DNSSECMode::ProcessNoValidate; |
4d2be65d RG |
1211 | } |
1212 | ||
1213 | uint32_t SyncRes::computeLowestTTD(const std::vector<DNSRecord>& records, const std::vector<std::shared_ptr<RRSIGRecordContent> >& signatures, uint32_t signaturesTTL) const | |
26ca3513 | 1214 | { |
4d2be65d RG |
1215 | uint32_t lowestTTD = std::numeric_limits<uint32_t>::max(); |
1216 | for(const auto& record : records) | |
1217 | lowestTTD = min(lowestTTD, record.d_ttl); | |
1218 | ||
1219 | if (validationEnabled() && !signatures.empty()) { | |
1220 | /* if we are validating, we don't want to cache records after their signatures | |
1221 | expires. */ | |
1222 | /* records TTL are now TTD, let's add 'now' to the signatures lowest TTL */ | |
1223 | lowestTTD = min(lowestTTD, static_cast<uint32_t>(signaturesTTL + d_now.tv_sec)); | |
1224 | ||
1225 | for(const auto& sig : signatures) { | |
1226 | if (sig->d_siginception <= d_now.tv_sec && sig->d_sigexpire > d_now.tv_sec) { | |
1227 | // we don't decerement d_sigexpire by 'now' because we actually want a TTD, not a TTL */ | |
1228 | lowestTTD = min(lowestTTD, static_cast<uint32_t>(sig->d_sigexpire)); | |
1229 | } | |
1230 | } | |
1231 | } | |
1232 | ||
1233 | return lowestTTD; | |
1234 | } | |
1235 | ||
1236 | void SyncRes::updateValidationState(vState& state, const vState stateUpdate) | |
1237 | { | |
1238 | LOG(d_prefix<<"validation state was "<<std::string(vStates[state])<<", state update is "<<std::string(vStates[stateUpdate])<<endl); | |
1239 | ||
895449a5 RG |
1240 | if (stateUpdate == TA) { |
1241 | state = Secure; | |
4d2be65d RG |
1242 | } |
1243 | else if (stateUpdate == NTA) { | |
1244 | state = Insecure; | |
1245 | } | |
895449a5 RG |
1246 | else if (stateUpdate == Bogus) { |
1247 | state = Bogus; | |
1248 | } | |
1249 | else if (state == Indeterminate) { | |
1250 | state = stateUpdate; | |
1251 | } | |
4d2be65d RG |
1252 | else if (stateUpdate == Insecure) { |
1253 | if (state != Bogus) { | |
1254 | state = Insecure; | |
1255 | } | |
1256 | } | |
4d2be65d RG |
1257 | LOG(d_prefix<<" validation state is now "<<std::string(vStates[state])<<endl); |
1258 | } | |
1259 | ||
1260 | vState SyncRes::getTA(const DNSName& zone, dsmap_t& ds) | |
1261 | { | |
1262 | auto luaLocal = g_luaconfs.getLocal(); | |
1263 | ||
1264 | if (luaLocal->dsAnchors.empty()) { | |
1265 | /* We have no TA, everything is insecure */ | |
1266 | return Insecure; | |
1267 | } | |
1268 | ||
1269 | std::string reason; | |
1270 | if (haveNegativeTrustAnchor(luaLocal->negAnchors, zone, reason)) { | |
1271 | LOG("Got NTA for "<<zone<<endl); | |
1272 | return NTA; | |
1273 | } | |
1274 | ||
1275 | if (getTrustAnchor(luaLocal->dsAnchors, zone, ds)) { | |
1276 | LOG("Got TA for "<<zone<<endl); | |
895449a5 | 1277 | return TA; |
4d2be65d RG |
1278 | } |
1279 | ||
1280 | if (zone.isRoot()) { | |
1281 | /* No TA for the root */ | |
1282 | return Insecure; | |
1283 | } | |
1284 | ||
1285 | return Indeterminate; | |
1286 | } | |
1287 | ||
8455425c RG |
1288 | static size_t countSupportedDS(const dsmap_t& dsmap) |
1289 | { | |
1290 | size_t count = 0; | |
1291 | ||
1292 | for (const auto& ds : dsmap) { | |
1293 | if (isSupportedDS(ds)) { | |
1294 | count++; | |
1295 | } | |
1296 | } | |
1297 | ||
1298 | return count; | |
1299 | } | |
1300 | ||
ad75fdbd | 1301 | vState SyncRes::getDSRecords(const DNSName& zone, dsmap_t& ds, bool taOnly, unsigned int depth, SyncRes::zonesStates_t& cuts) |
4d2be65d RG |
1302 | { |
1303 | vState result = getTA(zone, ds); | |
1304 | ||
1305 | if (result != Indeterminate || taOnly) { | |
895449a5 | 1306 | if ((result == Secure || result == TA) && countSupportedDS(ds) == 0) { |
8455425c RG |
1307 | ds.clear(); |
1308 | result = Insecure; | |
1309 | } | |
1310 | ||
4d2be65d RG |
1311 | return result; |
1312 | } | |
1313 | ||
1314 | bool oldSkipCNAME = d_skipCNAMECheck; | |
4d2be65d RG |
1315 | bool oldRequireAuthData = d_requireAuthData; |
1316 | d_skipCNAMECheck = true; | |
4d2be65d RG |
1317 | d_requireAuthData = false; |
1318 | ||
1319 | std::set<GetBestNSAnswer> beenthere; | |
1320 | std::vector<DNSRecord> dsrecords; | |
1321 | ||
1322 | vState state = Indeterminate; | |
ad75fdbd | 1323 | int rcode = doResolve(zone, QType(QType::DS), dsrecords, depth + 1, beenthere, state, cuts); |
4d2be65d | 1324 | d_skipCNAMECheck = oldSkipCNAME; |
4d2be65d RG |
1325 | d_requireAuthData = oldRequireAuthData; |
1326 | ||
1327 | if (rcode == RCode::NoError) { | |
1328 | if (state == Secure) { | |
1329 | for (const auto& record : dsrecords) { | |
1330 | if (record.d_type == QType::DS) { | |
1331 | const auto dscontent = getRR<DSRecordContent>(record); | |
8455425c | 1332 | if (dscontent && isSupportedDS(*dscontent)) { |
4d2be65d RG |
1333 | ds.insert(*dscontent); |
1334 | } | |
1335 | } | |
1336 | } | |
4d2be65d | 1337 | |
b7f378d1 RG |
1338 | if (ds.empty()) { |
1339 | return Insecure; | |
1340 | } | |
4d2be65d | 1341 | } |
b7f378d1 | 1342 | |
4d2be65d RG |
1343 | return state; |
1344 | } | |
1345 | ||
1346 | LOG("Returning Bogus state from "<<__func__<<"("<<zone<<")"<<endl); | |
1347 | return Bogus; | |
1348 | } | |
1349 | ||
70b3fe7a RG |
1350 | vState SyncRes::getValidationStatus(const SyncRes::zonesStates_t& cuts, const DNSName& subdomain) |
1351 | { | |
1352 | vState result = Indeterminate; | |
1353 | ||
1354 | if (!validationEnabled()) { | |
1355 | return result; | |
1356 | } | |
1357 | DNSName name(subdomain); | |
1358 | do { | |
1359 | const auto& it = cuts.find(name); | |
1360 | if (it != cuts.cend()) { | |
ad75fdbd | 1361 | LOG("Got status "<<vStates[it->second]<<" for name "<<subdomain<<" (from "<<name<<")"<<endl); |
70b3fe7a RG |
1362 | return it->second; |
1363 | } | |
1364 | } | |
1365 | while (name.chopOff()); | |
1366 | ||
1367 | return result; | |
1368 | } | |
1369 | ||
ad75fdbd | 1370 | void SyncRes::computeZoneCuts(SyncRes::zonesStates_t& cuts, const DNSName& begin, const DNSName& end, unsigned int depth) |
4d2be65d | 1371 | { |
ad75fdbd RG |
1372 | if (cuts.count(begin) != 0) { |
1373 | return; | |
4d2be65d RG |
1374 | } |
1375 | ||
1376 | dsmap_t ds; | |
ad75fdbd | 1377 | vState cutState = getDSRecords(end, ds, false, depth, cuts); |
70b3fe7a RG |
1378 | if (cutState == TA) { |
1379 | cutState = Secure; | |
1380 | } | |
1381 | else if (cutState == NTA) { | |
1382 | cutState = Insecure; | |
1383 | } | |
1384 | cuts[end] = cutState; | |
1385 | ||
ad75fdbd RG |
1386 | if (!validationEnabled()) { |
1387 | return; | |
70b3fe7a RG |
1388 | } |
1389 | ||
1390 | if(!begin.isPartOf(end)) { | |
f24465e5 | 1391 | throw PDNSException(end.toLogString() + " is not part of " + begin.toString()); |
70b3fe7a RG |
1392 | } |
1393 | ||
ad75fdbd RG |
1394 | if (d_computingZoneCut) { |
1395 | return; | |
1396 | } | |
1397 | ||
1398 | LOG(__func__<<", from "<<begin.toString()<<" to "<<end.toString()<<endl); | |
1399 | ||
70b3fe7a RG |
1400 | DNSName qname(end); |
1401 | std::vector<string> labelsToAdd = begin.makeRelative(end).getRawLabels(); | |
1402 | ||
ad75fdbd RG |
1403 | bool oldSkipCNAME = d_skipCNAMECheck; |
1404 | bool oldRequireAuthData = d_requireAuthData; | |
1405 | bool oldComputingZoneCut = d_computingZoneCut; | |
1406 | d_skipCNAMECheck = true; | |
1407 | d_requireAuthData = false; | |
1408 | d_computingZoneCut = true; | |
1409 | ||
70b3fe7a RG |
1410 | while(qname != begin) { |
1411 | bool foundCut = false; | |
1412 | if (labelsToAdd.empty()) | |
1413 | break; | |
1414 | ||
1415 | qname.prependRawLabel(labelsToAdd.back()); | |
1416 | labelsToAdd.pop_back(); | |
f24465e5 | 1417 | LOG("- Looking for a cut at "<<qname<<endl); |
70b3fe7a | 1418 | |
70b3fe7a RG |
1419 | std::set<GetBestNSAnswer> beenthere; |
1420 | std::vector<DNSRecord> nsrecords; | |
1421 | ||
1422 | vState state = Indeterminate; | |
ad75fdbd RG |
1423 | SyncRes::zonesStates_t tempCuts; |
1424 | int rcode = doResolve(qname, QType(QType::NS), nsrecords, depth + 1, beenthere, state, tempCuts); | |
70b3fe7a RG |
1425 | |
1426 | if (rcode == RCode::NoError && !nsrecords.empty()) { | |
1427 | for (const auto& record : nsrecords) { | |
1428 | if(record.d_type != QType::NS || record.d_name != qname) | |
1429 | continue; | |
1430 | foundCut = true; | |
1431 | break; | |
1432 | } | |
1433 | if (foundCut) { | |
f24465e5 | 1434 | LOG("- Found cut at "<<qname<<endl); |
70b3fe7a | 1435 | dsmap_t ds; |
ad75fdbd | 1436 | vState newState = getDSRecords(qname, ds, cutState == Insecure || cutState == Bogus, depth, cuts); |
a69867f2 RG |
1437 | if (newState != Indeterminate) { |
1438 | cutState = newState; | |
1439 | } | |
f24465e5 | 1440 | LOG("New state is "<<vStates[cutState]<<endl); |
70b3fe7a RG |
1441 | if (cutState == TA) { |
1442 | cutState = Secure; | |
1443 | } | |
1444 | else if (cutState == NTA) { | |
1445 | cutState = Insecure; | |
1446 | } | |
1447 | cuts[qname] = cutState; | |
1448 | } | |
1449 | } | |
1450 | } | |
1451 | ||
ad75fdbd RG |
1452 | d_skipCNAMECheck = oldSkipCNAME; |
1453 | d_requireAuthData = oldRequireAuthData; | |
1454 | d_computingZoneCut = oldComputingZoneCut; | |
1455 | ||
f24465e5 | 1456 | LOG("List of cuts from "<<begin<<" to "<<end<<endl); |
70b3fe7a | 1457 | for (const auto& cut : cuts) { |
f24465e5 | 1458 | LOG(" - "<<cut.first<<": "<<vStates[cut.second]<<endl); |
70b3fe7a | 1459 | } |
4d2be65d RG |
1460 | } |
1461 | ||
ad75fdbd | 1462 | vState SyncRes::validateDNSKeys(const DNSName& zone, const std::vector<DNSRecord>& dnskeys, const std::vector<std::shared_ptr<RRSIGRecordContent> >& signatures, unsigned int depth, SyncRes::zonesStates_t& cuts) |
4d2be65d RG |
1463 | { |
1464 | dsmap_t ds; | |
1465 | if (!signatures.empty()) { | |
1466 | DNSName signer = getSigner(signatures); | |
1467 | ||
1468 | if (!signer.empty() && signer.isPartOf(zone)) { | |
ad75fdbd | 1469 | vState state = getDSRecords(signer, ds, false, depth, cuts); |
b7f378d1 | 1470 | |
895449a5 RG |
1471 | if (state == TA) { |
1472 | state = Secure; | |
1473 | } | |
4d2be65d | 1474 | if (state != Secure) { |
8455425c RG |
1475 | if (state == NTA) { |
1476 | state = Insecure; | |
1477 | } | |
4d2be65d RG |
1478 | return state; |
1479 | } | |
1480 | } | |
1481 | } | |
1482 | ||
1483 | skeyset_t tentativeKeys; | |
1484 | std::vector<shared_ptr<DNSRecordContent> > toSign; | |
1485 | ||
1486 | for (const auto& dnskey : dnskeys) { | |
1487 | if (dnskey.d_type == QType::DNSKEY) { | |
1488 | auto content = getRR<DNSKEYRecordContent>(dnskey); | |
1489 | if (content) { | |
1490 | tentativeKeys.insert(content); | |
1491 | toSign.push_back(content); | |
1492 | } | |
1493 | } | |
1494 | } | |
1495 | ||
1496 | LOG("Trying to validate "<<std::to_string(tentativeKeys.size())<<" DNSKEYs with "<<std::to_string(ds.size())<<" DS"<<endl); | |
1497 | skeyset_t validatedKeys; | |
1498 | validateDNSKeysAgainstDS(d_now.tv_sec, zone, ds, tentativeKeys, toSign, signatures, validatedKeys); | |
1499 | ||
1500 | LOG("We now have "<<std::to_string(validatedKeys.size())<<" DNSKEYs"<<endl); | |
1501 | ||
1502 | if (validatedKeys.size() != tentativeKeys.size()) { | |
1503 | LOG("Returning Bogus state from "<<__func__<<"("<<zone<<")"<<endl); | |
1504 | return Bogus; | |
1505 | } | |
1506 | ||
1507 | return Secure; | |
1508 | } | |
1509 | ||
ad75fdbd | 1510 | vState SyncRes::getDNSKeys(const DNSName& signer, skeyset_t& keys, unsigned int depth, SyncRes::zonesStates_t& cuts) |
4d2be65d RG |
1511 | { |
1512 | std::vector<DNSRecord> records; | |
1513 | std::set<GetBestNSAnswer> beenthere; | |
1514 | LOG("Retrieving DNSKeys for "<<signer<<endl); | |
1515 | ||
1516 | vState state = Indeterminate; | |
c7385ddb RG |
1517 | /* following CNAME might lead to us to the wrong DNSKEY */ |
1518 | bool oldSkipCNAME = d_skipCNAMECheck; | |
1519 | d_skipCNAMECheck = true; | |
ad75fdbd | 1520 | int rcode = doResolve(signer, QType(QType::DNSKEY), records, depth + 1, beenthere, state, cuts); |
c7385ddb | 1521 | d_skipCNAMECheck = oldSkipCNAME; |
4d2be65d RG |
1522 | |
1523 | if (rcode == RCode::NoError) { | |
1524 | if (state == Secure) { | |
1525 | for (const auto& key : records) { | |
1526 | if (key.d_type == QType::DNSKEY) { | |
1527 | auto content = getRR<DNSKEYRecordContent>(key); | |
1528 | if (content) { | |
1529 | keys.insert(content); | |
1530 | } | |
1531 | } | |
1532 | } | |
1533 | } | |
1534 | LOG("Retrieved "<<keys.size()<<" DNSKeys for "<<signer<<", state is "<<vStates[state]<<endl); | |
1535 | return state; | |
1536 | } | |
1537 | ||
1538 | LOG("Returning Bogus state from "<<__func__<<"("<<signer<<")"<<endl); | |
1539 | return Bogus; | |
1540 | } | |
1541 | ||
ad75fdbd | 1542 | vState SyncRes::validateRecordsWithSigs(unsigned int depth, const DNSName& qname, const QType& qtype, const DNSName& name, const std::vector<DNSRecord>& records, const std::vector<std::shared_ptr<RRSIGRecordContent> >& signatures, SyncRes::zonesStates_t& cuts) |
4d2be65d RG |
1543 | { |
1544 | skeyset_t keys; | |
1545 | if (!signatures.empty()) { | |
1546 | const DNSName signer = getSigner(signatures); | |
1547 | if (!signer.empty() && name.isPartOf(signer)) { | |
15f44f1d RG |
1548 | if (qtype == QType::DNSKEY && signer == qname) { |
1549 | /* we are already retrieving those keys, sorry */ | |
1550 | return Indeterminate; | |
1551 | } | |
ad75fdbd | 1552 | vState state = getDNSKeys(signer, keys, depth, cuts); |
4d2be65d RG |
1553 | if (state != Secure) { |
1554 | return state; | |
1555 | } | |
1556 | } | |
1557 | } else { | |
1558 | LOG("Bogus!"<<endl); | |
1559 | return Bogus; | |
1560 | } | |
1561 | ||
1562 | std::vector<std::shared_ptr<DNSRecordContent> > recordcontents; | |
1563 | for (const auto& record : records) { | |
1564 | recordcontents.push_back(record.d_content); | |
1565 | } | |
1566 | ||
1567 | LOG("Going to validate "<<recordcontents.size()<< " record contents with "<<signatures.size()<<" sigs and "<<keys.size()<<" keys for "<<name<<endl); | |
1568 | if (validateWithKeySet(d_now.tv_sec, name, recordcontents, signatures, keys, false)) { | |
1569 | LOG("Secure!"<<endl); | |
1570 | return Secure; | |
1571 | } | |
1572 | ||
1573 | LOG("Bogus!"<<endl); | |
1574 | return Bogus; | |
1575 | } | |
1576 | ||
ad75fdbd | 1577 | RCode::rcodes_ SyncRes::updateCacheFromRecords(unsigned int depth, LWResult& lwr, const DNSName& qname, const QType& qtype, const DNSName& auth, bool wasForwarded, const boost::optional<Netmask> ednsmask, vState& state, SyncRes::zonesStates_t& cuts, bool& needWildcardProof) |
4d2be65d RG |
1578 | { |
1579 | struct CacheEntry | |
26ca3513 RG |
1580 | { |
1581 | vector<DNSRecord> records; | |
1582 | vector<shared_ptr<RRSIGRecordContent>> signatures; | |
4d2be65d | 1583 | uint32_t signaturesTTL{std::numeric_limits<uint32_t>::max()}; |
26ca3513 RG |
1584 | }; |
1585 | struct CacheKey | |
1586 | { | |
1587 | DNSName name; | |
1588 | uint16_t type; | |
1589 | DNSResourceRecord::Place place; | |
1590 | bool operator<(const CacheKey& rhs) const { | |
1591 | return tie(name, type) < tie(rhs.name, rhs.type); | |
1592 | } | |
1593 | }; | |
4d2be65d | 1594 | typedef map<CacheKey, CacheEntry> tcache_t; |
26ca3513 RG |
1595 | tcache_t tcache; |
1596 | ||
4d2be65d RG |
1597 | string prefix; |
1598 | if(doLog()) { | |
1599 | prefix=d_prefix; | |
1600 | prefix.append(depth, ' '); | |
1601 | } | |
1602 | ||
2b984251 | 1603 | std::vector<std::shared_ptr<DNSRecord>> authorityRecs; |
26ca3513 | 1604 | for(const auto& rec : lwr.d_records) { |
2b984251 RG |
1605 | if(needWildcardProof) { |
1606 | if (nsecTypes.count(rec.d_type)) { | |
1607 | authorityRecs.push_back(std::make_shared<DNSRecord>(rec)); | |
1608 | } | |
1609 | else if (rec.d_type == QType::RRSIG) { | |
1610 | auto rrsig = getRR<RRSIGRecordContent>(rec); | |
1611 | if (rrsig && nsecTypes.count(rrsig->d_type)) { | |
1612 | authorityRecs.push_back(std::make_shared<DNSRecord>(rec)); | |
1613 | } | |
1614 | } | |
1615 | } | |
26ca3513 RG |
1616 | if(rec.d_type == QType::RRSIG) { |
1617 | auto rrsig = getRR<RRSIGRecordContent>(rec); | |
1618 | if (rrsig) { | |
2b984251 RG |
1619 | if (rec.d_name == qname && rrsig->d_labels < rec.d_name.countLabels()) { |
1620 | LOG(prefix<<qname<<": RRSIG indicates the name was expanded from a wildcard, we need a wildcard proof"<<endl); | |
1621 | needWildcardProof = true; | |
1622 | } | |
1623 | ||
26ca3513 RG |
1624 | // cerr<<"Got an RRSIG for "<<DNSRecordContent::NumberToType(rrsig->d_type)<<" with name '"<<rec.d_name<<"'"<<endl; |
1625 | tcache[{rec.d_name, rrsig->d_type, rec.d_place}].signatures.push_back(rrsig); | |
4d2be65d | 1626 | tcache[{rec.d_name, rrsig->d_type, rec.d_place}].signaturesTTL = std::min(tcache[{rec.d_name, rrsig->d_type, rec.d_place}].signaturesTTL, rec.d_ttl); |
26ca3513 RG |
1627 | } |
1628 | } | |
1629 | } | |
1630 | ||
1631 | // reap all answers from this packet that are acceptable | |
1632 | for(auto& rec : lwr.d_records) { | |
1633 | if(rec.d_type == QType::OPT) { | |
1634 | LOG(prefix<<qname<<": OPT answer '"<<rec.d_name<<"' from '"<<auth<<"' nameservers" <<endl); | |
1635 | continue; | |
1636 | } | |
1637 | LOG(prefix<<qname<<": accept answer '"<<rec.d_name<<"|"<<DNSRecordContent::NumberToType(rec.d_type)<<"|"<<rec.d_content->getZoneRepresentation()<<"' from '"<<auth<<"' nameservers? "<<(int)rec.d_place<<" "); | |
1638 | if(rec.d_type == QType::ANY) { | |
1639 | LOG("NO! - we don't accept 'ANY' data"<<endl); | |
1640 | continue; | |
1641 | } | |
1642 | ||
1643 | if(rec.d_name.isPartOf(auth)) { | |
1644 | if(rec.d_type == QType::RRSIG) { | |
1645 | LOG("RRSIG - separate"<<endl); | |
1646 | } | |
4d2be65d | 1647 | else if(lwr.d_aabit && lwr.d_rcode==RCode::NoError && rec.d_place==DNSResourceRecord::ANSWER && ((rec.d_type != QType::DNSKEY && rec.d_type != QType::DS) || rec.d_name != auth) && s_delegationOnly.count(auth)) { |
26ca3513 RG |
1648 | LOG("NO! Is from delegation-only zone"<<endl); |
1649 | s_nodelegated++; | |
1650 | return RCode::NXDomain; | |
1651 | } | |
1652 | else { | |
1653 | bool haveLogged = false; | |
a712cb56 | 1654 | if (!t_sstorage.domainmap->empty()) { |
26ca3513 RG |
1655 | // Check if we are authoritative for a zone in this answer |
1656 | DNSName tmp_qname(rec.d_name); | |
1657 | auto auth_domain_iter=getBestAuthZone(&tmp_qname); | |
a712cb56 | 1658 | if(auth_domain_iter!=t_sstorage.domainmap->end() && |
26ca3513 RG |
1659 | auth.countLabels() <= auth_domain_iter->first.countLabels()) { |
1660 | if (auth_domain_iter->first != auth) { | |
1661 | LOG("NO! - we are authoritative for the zone "<<auth_domain_iter->first<<endl); | |
1662 | continue; | |
1663 | } else { | |
1664 | LOG("YES! - This answer was "); | |
6dfff36f | 1665 | if (!wasForwarded) { |
26ca3513 RG |
1666 | LOG("retrieved from the local auth store."); |
1667 | } else { | |
1668 | LOG("received from a server we forward to."); | |
1669 | } | |
1670 | haveLogged = true; | |
1671 | LOG(endl); | |
1672 | } | |
1673 | } | |
1674 | } | |
1675 | if (!haveLogged) { | |
1676 | LOG("YES!"<<endl); | |
1677 | } | |
1678 | ||
1679 | rec.d_ttl=min(s_maxcachettl, rec.d_ttl); | |
1680 | ||
1681 | DNSRecord dr(rec); | |
26ca3513 | 1682 | dr.d_ttl += d_now.tv_sec; |
2b984251 | 1683 | dr.d_place=DNSResourceRecord::ANSWER; |
26ca3513 RG |
1684 | tcache[{rec.d_name,rec.d_type,rec.d_place}].records.push_back(dr); |
1685 | } | |
1686 | } | |
1687 | else | |
1688 | LOG("NO!"<<endl); | |
1689 | } | |
1690 | ||
1691 | // supplant | |
4d2be65d RG |
1692 | for(tcache_t::iterator i = tcache.begin(); i != tcache.end(); ++i) { |
1693 | if((i->second.records.size() + i->second.signatures.size()) > 1) { // need to group the ttl to be the minimum of the RRSET (RFC 2181, 5.2) | |
1694 | uint32_t lowestTTD=computeLowestTTD(i->second.records, i->second.signatures, i->second.signaturesTTL); | |
26ca3513 RG |
1695 | |
1696 | for(auto& record : i->second.records) | |
4d2be65d | 1697 | record.d_ttl = lowestTTD; // boom |
26ca3513 RG |
1698 | } |
1699 | ||
1700 | // cout<<"Have "<<i->second.records.size()<<" records and "<<i->second.signatures.size()<<" signatures for "<<i->first.name; | |
1701 | // cout<<'|'<<DNSRecordContent::NumberToType(i->first.type)<<endl; | |
4d2be65d RG |
1702 | } |
1703 | ||
1704 | for(tcache_t::iterator i = tcache.begin(); i != tcache.end(); ++i) { | |
4d2be65d | 1705 | |
26ca3513 RG |
1706 | if(i->second.records.empty()) // this happens when we did store signatures, but passed on the records themselves |
1707 | continue; | |
6dfff36f | 1708 | |
70b3fe7a RG |
1709 | // vState recordState = state; |
1710 | vState recordState = getValidationStatus(cuts, i->first.name); | |
f24465e5 | 1711 | LOG("Got status "<<vStates[recordState]<<" for record "<<i->first.name<<endl); |
70b3fe7a RG |
1712 | |
1713 | if (validationEnabled() && recordState == Secure) { | |
4d2be65d RG |
1714 | if (lwr.d_aabit) { |
1715 | if (i->first.place != DNSResourceRecord::ADDITIONAL) { | |
1716 | /* the additional entries can be insecure, | |
1717 | like glue: | |
1718 | "Glue address RRsets associated with delegations MUST NOT be signed" | |
1719 | */ | |
1720 | if (i->first.type == QType::DNSKEY && i->first.place == DNSResourceRecord::ANSWER) { | |
88cb0fe0 | 1721 | LOG("Validating DNSKEY for "<<i->first.name<<endl); |
ad75fdbd | 1722 | recordState = validateDNSKeys(i->first.name, i->second.records, i->second.signatures, depth, cuts); |
4d2be65d RG |
1723 | } |
1724 | else { | |
88cb0fe0 | 1725 | LOG("Validating non-additional record for "<<i->first.name<<endl); |
ad75fdbd | 1726 | recordState = validateRecordsWithSigs(depth, qname, qtype, i->first.name, i->second.records, i->second.signatures, cuts); |
4d2be65d RG |
1727 | } |
1728 | } | |
1729 | } | |
1730 | else { | |
88cb0fe0 RG |
1731 | /* for non authoritative answer, we only care about the DS record (or lack of) */ |
1732 | if ((i->first.type == QType::DS || i->first.type == QType::NSEC || i->first.type == QType::NSEC3) && i->first.place == DNSResourceRecord::AUTHORITY) { | |
1733 | LOG("Validating DS record for "<<i->first.name<<endl); | |
ad75fdbd | 1734 | recordState = validateRecordsWithSigs(depth, qname, qtype, i->first.name, i->second.records, i->second.signatures, cuts); |
4d2be65d RG |
1735 | } |
1736 | } | |
1737 | updateValidationState(state, recordState); | |
1738 | } | |
1739 | else { | |
1740 | if (validationEnabled()) { | |
1741 | LOG("Skipping validation because the current state is "<<vStates[state]<<endl); | |
1742 | } | |
1743 | } | |
1744 | ||
2b984251 | 1745 | t_RC->replace(d_now.tv_sec, i->first.name, QType(i->first.type), i->second.records, i->second.signatures, authorityRecs, lwr.d_aabit, i->first.place == DNSResourceRecord::ANSWER ? ednsmask : boost::none, recordState); |
6dfff36f | 1746 | |
26ca3513 RG |
1747 | if(i->first.place == DNSResourceRecord::ANSWER && ednsmask) |
1748 | d_wasVariable=true; | |
1749 | } | |
1750 | ||
1751 | return RCode::NoError; | |
1752 | } | |
1753 | ||
860d5e8e | 1754 | void SyncRes::getDenialValidationState(NegCache::NegCacheEntry& ne, vState& state, const dState expectedState, bool allowOptOut) |
4d2be65d RG |
1755 | { |
1756 | ne.d_validationState = state; | |
1757 | ||
1758 | if (state == Secure) { | |
1759 | cspmap_t csp = harvestCSPFromNE(ne); | |
1760 | dState res = getDenial(csp, ne.d_name, ne.d_qtype.getCode()); | |
1761 | if (res != expectedState) { | |
860d5e8e RG |
1762 | if (res == OPTOUT && allowOptOut) { |
1763 | LOG("OPT-out denial found for "<<ne.d_name<<", retuning Insecure"<<endl); | |
1764 | ne.d_validationState = Secure; | |
1765 | updateValidationState(state, Insecure); | |
1766 | return; | |
4d2be65d | 1767 | } |
d377bb54 RG |
1768 | else if (res == INSECURE) { |
1769 | LOG("Insecure denial found for "<<ne.d_name<<", retuning Insecure"<<endl); | |
1770 | ne.d_validationState = Insecure; | |
1771 | } | |
4d2be65d RG |
1772 | else { |
1773 | LOG("Invalid denial found for "<<ne.d_name<<", retuning Bogus"<<endl); | |
1774 | ne.d_validationState = Bogus; | |
1775 | } | |
1776 | updateValidationState(state, ne.d_validationState); | |
1777 | } | |
1778 | } | |
1779 | } | |
1780 | ||
2b984251 | 1781 | bool SyncRes::processRecords(const std::string& prefix, const DNSName& qname, const QType& qtype, const DNSName& auth, LWResult& lwr, const bool sendRDQuery, vector<DNSRecord>& ret, set<DNSName>& nsset, DNSName& newtarget, DNSName& newauth, bool& realreferral, bool& negindic, vState& state, bool needWildcardProof) |
26ca3513 RG |
1782 | { |
1783 | bool done = false; | |
1784 | ||
1785 | for(auto& rec : lwr.d_records) { | |
1786 | if (rec.d_type!=QType::OPT && rec.d_class!=QClass::IN) | |
1787 | continue; | |
1788 | ||
1789 | if(rec.d_place==DNSResourceRecord::AUTHORITY && rec.d_type==QType::SOA && | |
1790 | lwr.d_rcode==RCode::NXDomain && qname.isPartOf(rec.d_name) && rec.d_name.isPartOf(auth)) { | |
1791 | LOG(prefix<<qname<<": got negative caching indication for name '"<<qname<<"' (accept="<<rec.d_name.isPartOf(auth)<<"), newtarget='"<<newtarget<<"'"<<endl); | |
1792 | ||
1793 | rec.d_ttl = min(rec.d_ttl, s_maxnegttl); | |
1794 | if(newtarget.empty()) // only add a SOA if we're not going anywhere after this | |
1795 | ret.push_back(rec); | |
1796 | if(!wasVariable()) { | |
39ce10b2 PL |
1797 | NegCache::NegCacheEntry ne; |
1798 | ||
39ce10b2 PL |
1799 | ne.d_ttd = d_now.tv_sec + rec.d_ttl; |
1800 | ne.d_name = qname; | |
1801 | ne.d_qtype = QType(0); // this encodes 'whole record' | |
898856ca | 1802 | ne.d_auth = rec.d_name; |
39ce10b2 | 1803 | harvestNXRecords(lwr.d_records, ne); |
860d5e8e | 1804 | getDenialValidationState(ne, state, NXDOMAIN, false); |
a712cb56 | 1805 | t_sstorage.negcache.add(ne); |
07e3cfb6 | 1806 | if(s_rootNXTrust && ne.d_auth.isRoot() && auth.isRoot()) { |
9a1e060b | 1807 | ne.d_name = ne.d_name.getLastLabel(); |
a712cb56 | 1808 | t_sstorage.negcache.add(ne); |
26ca3513 RG |
1809 | } |
1810 | } | |
1811 | ||
1812 | negindic=true; | |
1813 | } | |
4d2be65d | 1814 | else if(rec.d_place==DNSResourceRecord::ANSWER && rec.d_type==QType::CNAME && (!(qtype==QType(QType::CNAME))) && rec.d_name == qname) { |
26ca3513 RG |
1815 | ret.push_back(rec); |
1816 | if (auto content = getRR<CNAMERecordContent>(rec)) { | |
1817 | newtarget=content->getTarget(); | |
1818 | } | |
1819 | } | |
2b984251 | 1820 | else if((rec.d_type==QType::RRSIG || rec.d_type==QType::NSEC || rec.d_type==QType::NSEC3) && rec.d_place==DNSResourceRecord::ANSWER) { |
26ca3513 RG |
1821 | if(rec.d_type != QType::RRSIG || rec.d_name == qname) |
1822 | ret.push_back(rec); // enjoy your DNSSEC | |
1823 | } | |
2b984251 RG |
1824 | else if(needWildcardProof && (rec.d_type==QType::RRSIG || rec.d_type==QType::NSEC || rec.d_type==QType::NSEC3) && rec.d_place==DNSResourceRecord::AUTHORITY) { |
1825 | ret.push_back(rec); // enjoy your DNSSEC | |
1826 | } | |
26ca3513 RG |
1827 | // for ANY answers we *must* have an authoritative answer, unless we are forwarding recursively |
1828 | else if(rec.d_place==DNSResourceRecord::ANSWER && rec.d_name == qname && | |
1829 | ( | |
1830 | rec.d_type==qtype.getCode() || (lwr.d_aabit && (qtype==QType(QType::ANY) || magicAddrMatch(qtype, QType(rec.d_type)) ) ) || sendRDQuery | |
1831 | ) | |
1832 | ) | |
1833 | { | |
1834 | LOG(prefix<<qname<<": answer is in: resolved to '"<< rec.d_content->getZoneRepresentation()<<"|"<<DNSRecordContent::NumberToType(rec.d_type)<<"'"<<endl); | |
1835 | ||
1836 | done=true; | |
1837 | ret.push_back(rec); | |
1838 | } | |
4d2be65d | 1839 | else if(rec.d_place==DNSResourceRecord::AUTHORITY && rec.d_type==QType::NS && qname.isPartOf(rec.d_name)) { |
26ca3513 RG |
1840 | if(moreSpecificThan(rec.d_name,auth)) { |
1841 | newauth=rec.d_name; | |
1842 | LOG(prefix<<qname<<": got NS record '"<<rec.d_name<<"' -> '"<<rec.d_content->getZoneRepresentation()<<"'"<<endl); | |
1843 | realreferral=true; | |
1844 | } | |
1845 | else { | |
1846 | LOG(prefix<<qname<<": got upwards/level NS record '"<<rec.d_name<<"' -> '"<<rec.d_content->getZoneRepresentation()<<"', had '"<<auth<<"'"<<endl); | |
1847 | } | |
1848 | if (auto content = getRR<NSRecordContent>(rec)) { | |
1849 | nsset.insert(content->getNS()); | |
1850 | } | |
1851 | } | |
4d2be65d | 1852 | else if(rec.d_place==DNSResourceRecord::AUTHORITY && rec.d_type==QType::DS && qname.isPartOf(rec.d_name)) { |
26ca3513 | 1853 | LOG(prefix<<qname<<": got DS record '"<<rec.d_name<<"' -> '"<<rec.d_content->getZoneRepresentation()<<"'"<<endl); |
26ca3513 | 1854 | } |
860d5e8e | 1855 | else if(realreferral && rec.d_place==DNSResourceRecord::AUTHORITY && (rec.d_type==QType::NSEC || rec.d_type==QType::NSEC3) && newauth.isPartOf(auth)) { |
4d2be65d RG |
1856 | /* we might have received a denial of the DS, let's check */ |
1857 | if (state == Secure) { | |
1858 | NegCache::NegCacheEntry ne; | |
1859 | ne.d_auth = auth; | |
1860 | ne.d_ttd = d_now.tv_sec + rec.d_ttl; | |
860d5e8e RG |
1861 | ne.d_name = newauth; |
1862 | ne.d_qtype = QType::DS; | |
4d2be65d RG |
1863 | harvestNXRecords(lwr.d_records, ne); |
1864 | cspmap_t csp = harvestCSPFromNE(ne); | |
860d5e8e | 1865 | dState denialState = getDenial(csp, newauth, QType::DS); |
d377bb54 | 1866 | if (denialState == NXQTYPE || denialState == OPTOUT || denialState == INSECURE) { |
860d5e8e | 1867 | ne.d_validationState = Secure; |
4d2be65d | 1868 | rec.d_ttl = min(s_maxnegttl, rec.d_ttl); |
812c3a69 RG |
1869 | LOG(prefix<<qname<<": got negative indication of DS record for '"<<newauth<<"'"<<endl); |
1870 | updateValidationState(state, Insecure); | |
4d2be65d RG |
1871 | if(!wasVariable()) { |
1872 | t_sstorage.negcache.add(ne); | |
1873 | } | |
4d2be65d RG |
1874 | } |
1875 | } | |
1876 | } | |
1877 | else if(!done && rec.d_place==DNSResourceRecord::AUTHORITY && rec.d_type==QType::SOA && | |
1878 | lwr.d_rcode==RCode::NoError && qname.isPartOf(rec.d_name)) { | |
26ca3513 RG |
1879 | LOG(prefix<<qname<<": got negative caching indication for '"<< qname<<"|"<<qtype.getName()<<"'"<<endl); |
1880 | ||
1881 | if(!newtarget.empty()) { | |
1882 | LOG(prefix<<qname<<": Hang on! Got a redirect to '"<<newtarget<<"' already"<<endl); | |
1883 | } | |
1884 | else { | |
1885 | rec.d_ttl = min(s_maxnegttl, rec.d_ttl); | |
1886 | ret.push_back(rec); | |
1887 | if(!wasVariable()) { | |
39ce10b2 PL |
1888 | NegCache::NegCacheEntry ne; |
1889 | ne.d_auth = rec.d_name; | |
1890 | ne.d_ttd = d_now.tv_sec + rec.d_ttl; | |
1891 | ne.d_name = qname; | |
1892 | ne.d_qtype = qtype; | |
1893 | harvestNXRecords(lwr.d_records, ne); | |
860d5e8e | 1894 | getDenialValidationState(ne, state, NXQTYPE, qtype == QType::DS); |
26ca3513 | 1895 | if(qtype.getCode()) { // prevents us from blacking out a whole domain |
a712cb56 | 1896 | t_sstorage.negcache.add(ne); |
26ca3513 RG |
1897 | } |
1898 | } | |
1899 | negindic=true; | |
1900 | } | |
1901 | } | |
1902 | } | |
1903 | ||
1904 | return done; | |
1905 | } | |
1906 | ||
6dfff36f RG |
1907 | bool SyncRes::doResolveAtThisIP(const std::string& prefix, const DNSName& qname, const QType& qtype, LWResult& lwr, boost::optional<Netmask>& ednsmask, const DNSName& auth, bool const sendRDQuery, const DNSName& nsName, const ComboAddress& remoteIP, bool doTCP, bool* truncated) |
1908 | { | |
1909 | int resolveret; | |
1910 | s_outqueries++; | |
1911 | d_outqueries++; | |
1912 | ||
1913 | if(d_outqueries + d_throttledqueries > s_maxqperq) { | |
1914 | throw ImmediateServFailException("more than "+std::to_string(s_maxqperq)+" (max-qperq) queries sent while resolving "+qname.toLogString()); | |
1915 | } | |
1916 | ||
1917 | if(s_maxtotusec && d_totUsec > s_maxtotusec) { | |
1918 | throw ImmediateServFailException("Too much time waiting for "+qname.toLogString()+"|"+qtype.getName()+", timeouts: "+std::to_string(d_timeouts) +", throttles: "+std::to_string(d_throttledqueries) + ", queries: "+std::to_string(d_outqueries)+", "+std::to_string(d_totUsec/1000)+"msec"); | |
1919 | } | |
1920 | ||
1921 | if(doTCP) { | |
1922 | LOG(prefix<<qname<<": using TCP with "<< remoteIP.toStringWithPort() <<endl); | |
1923 | s_tcpoutqueries++; | |
1924 | d_tcpoutqueries++; | |
1925 | } | |
1926 | ||
1927 | if(d_pdl && d_pdl->preoutquery(remoteIP, d_requestor, qname, qtype, doTCP, lwr.d_records, resolveret)) { | |
1928 | LOG(prefix<<qname<<": query handled by Lua"<<endl); | |
1929 | } | |
1930 | else { | |
1931 | ednsmask=getEDNSSubnetMask(d_requestor, qname, remoteIP); | |
1932 | if(ednsmask) { | |
1933 | LOG(prefix<<qname<<": Adding EDNS Client Subnet Mask "<<ednsmask->toString()<<" to query"<<endl); | |
1934 | } | |
1935 | resolveret = asyncresolveWrapper(remoteIP, d_doDNSSEC, qname, qtype.getCode(), | |
1936 | doTCP, sendRDQuery, &d_now, ednsmask, &lwr); // <- we go out on the wire! | |
1937 | if(ednsmask) { | |
1938 | LOG(prefix<<qname<<": Received EDNS Client Subnet Mask "<<ednsmask->toString()<<" on response"<<endl); | |
1939 | } | |
1940 | } | |
1941 | ||
1942 | /* preoutquery killed the query by setting dq.rcode to -3 */ | |
1943 | if(resolveret==-3) { | |
1944 | throw ImmediateServFailException("Query killed by policy"); | |
1945 | } | |
1946 | ||
1947 | d_totUsec += lwr.d_usec; | |
1948 | accountAuthLatency(lwr.d_usec, remoteIP.sin4.sin_family); | |
1949 | ||
1950 | if(resolveret != 1) { | |
1951 | /* Error while resolving */ | |
1952 | if(resolveret == 0) { | |
1953 | /* Time out */ | |
1954 | ||
1955 | LOG(prefix<<qname<<": timeout resolving after "<<lwr.d_usec/1000.0<<"msec "<< (doTCP ? "over TCP" : "")<<endl); | |
1956 | d_timeouts++; | |
1957 | s_outgoingtimeouts++; | |
1958 | ||
1959 | if(remoteIP.sin4.sin_family == AF_INET) | |
1960 | s_outgoing4timeouts++; | |
1961 | else | |
1962 | s_outgoing6timeouts++; | |
1963 | } | |
1964 | else if(resolveret == -2) { | |
1965 | /* OS resource limit reached */ | |
1966 | LOG(prefix<<qname<<": hit a local resource limit resolving"<< (doTCP ? " over TCP" : "")<<", probable error: "<<stringerror()<<endl); | |
1967 | g_stats.resourceLimits++; | |
1968 | } | |
1969 | else { | |
1970 | /* -1 means server unreachable */ | |
1971 | s_unreachables++; | |
1972 | d_unreachables++; | |
1973 | LOG(prefix<<qname<<": error resolving from "<<remoteIP.toString()<< (doTCP ? " over TCP" : "") <<", possible error: "<<strerror(errno)<< endl); | |
1974 | } | |
1975 | ||
1976 | if(resolveret != -2) { // don't account for resource limits, they are our own fault | |
1977 | t_sstorage.nsSpeeds[nsName].submit(remoteIP, 1000000, &d_now); // 1 sec | |
1978 | ||
1979 | // code below makes sure we don't filter COM or the root | |
1980 | if (s_serverdownmaxfails > 0 && (auth != g_rootdnsname) && t_sstorage.fails.incr(remoteIP) >= s_serverdownmaxfails) { | |
1981 | LOG(prefix<<qname<<": Max fails reached resolving on "<< remoteIP.toString() <<". Going full throttle for "<< s_serverdownthrottletime <<" seconds" <<endl); | |
1982 | // mark server as down | |
1983 | t_sstorage.throttle.throttle(d_now.tv_sec, boost::make_tuple(remoteIP, "", 0), s_serverdownthrottletime, 10000); | |
1984 | } | |
1985 | else if (resolveret == -1) { | |
1986 | // unreachable, 1 minute or 100 queries | |
1987 | t_sstorage.throttle.throttle(d_now.tv_sec, boost::make_tuple(remoteIP, qname, qtype.getCode()), 60, 100); | |
1988 | } | |
1989 | else { | |
1990 | // timeout | |
1991 | t_sstorage.throttle.throttle(d_now.tv_sec, boost::make_tuple(remoteIP, qname, qtype.getCode()), 10, 5); | |
1992 | } | |
1993 | } | |
1994 | ||
1995 | return false; | |
1996 | } | |
1997 | ||
1998 | /* we got an answer */ | |
1999 | if(lwr.d_rcode==RCode::ServFail || lwr.d_rcode==RCode::Refused) { | |
2000 | LOG(prefix<<qname<<": "<<nsName<<" ("<<remoteIP.toString()<<") returned a "<< (lwr.d_rcode==RCode::ServFail ? "ServFail" : "Refused") << ", trying sibling IP or NS"<<endl); | |
2001 | t_sstorage.throttle.throttle(d_now.tv_sec, boost::make_tuple(remoteIP, qname, qtype.getCode()), 60, 3); | |
2002 | return false; | |
2003 | } | |
2004 | ||
2005 | /* this server sent a valid answer, mark it backup up if it was down */ | |
2006 | if(s_serverdownmaxfails > 0) { | |
2007 | t_sstorage.fails.clear(remoteIP); | |
2008 | } | |
2009 | ||
2010 | if(lwr.d_tcbit) { | |
2011 | *truncated = true; | |
2012 | ||
2013 | if (doTCP) { | |
2014 | LOG(prefix<<qname<<": truncated bit set, over TCP?"<<endl); | |
2015 | /* let's treat that as a ServFail answer from this server */ | |
2016 | t_sstorage.throttle.throttle(d_now.tv_sec, boost::make_tuple(remoteIP, qname, qtype.getCode()), 60, 3); | |
2017 | return false; | |
2018 | } | |
2019 | ||
2020 | return true; | |
2021 | } | |
2022 | ||
2023 | return true; | |
2024 | } | |
2025 | ||
ad75fdbd | 2026 | bool SyncRes::processAnswer(unsigned int depth, LWResult& lwr, const DNSName& qname, const QType& qtype, DNSName& auth, bool wasForwarded, const boost::optional<Netmask> ednsmask, bool sendRDQuery, NsSet &nameservers, std::vector<DNSRecord>& ret, const DNSFilterEngine& dfe, bool* gotNewServers, int* rcode, vState& state, SyncRes::zonesStates_t& cuts) |
6dfff36f RG |
2027 | { |
2028 | string prefix; | |
2029 | if(doLog()) { | |
2030 | prefix=d_prefix; | |
2031 | prefix.append(depth, ' '); | |
2032 | } | |
2033 | ||
2034 | if(s_minimumTTL) { | |
2035 | for(auto& rec : lwr.d_records) { | |
2036 | rec.d_ttl = max(rec.d_ttl, s_minimumTTL); | |
2037 | } | |
2038 | } | |
2039 | ||
2b984251 | 2040 | bool needWildcardProof = false; |
15f44f1d | 2041 | *rcode = updateCacheFromRecords(depth, lwr, qname, qtype, auth, wasForwarded, ednsmask, state, cuts, needWildcardProof); |
6dfff36f RG |
2042 | if (*rcode != RCode::NoError) { |
2043 | return true; | |
2044 | } | |
2045 | ||
2046 | LOG(prefix<<qname<<": determining status after receiving this packet"<<endl); | |
2047 | ||
2048 | set<DNSName> nsset; | |
2049 | bool realreferral=false, negindic=false; | |
2050 | DNSName newauth; | |
2051 | DNSName newtarget; | |
2052 | ||
2b984251 | 2053 | bool done = processRecords(prefix, qname, qtype, auth, lwr, sendRDQuery, ret, nsset, newtarget, newauth, realreferral, negindic, state, needWildcardProof); |
6dfff36f RG |
2054 | |
2055 | if(done){ | |
2056 | LOG(prefix<<qname<<": status=got results, this level of recursion done"<<endl); | |
2057 | *rcode = RCode::NoError; | |
2058 | return true; | |
2059 | } | |
2060 | ||
2061 | if(!newtarget.empty()) { | |
2062 | if(newtarget == qname) { | |
2063 | LOG(prefix<<qname<<": status=got a CNAME referral to self, returning SERVFAIL"<<endl); | |
2064 | *rcode = RCode::ServFail; | |
2065 | return true; | |
2066 | } | |
2067 | ||
2068 | if(depth > 10) { | |
2069 | LOG(prefix<<qname<<": status=got a CNAME referral, but recursing too deep, returning SERVFAIL"<<endl); | |
2070 | *rcode = RCode::ServFail; | |
2071 | return true; | |
2072 | } | |
2073 | ||
2074 | LOG(prefix<<qname<<": status=got a CNAME referral, starting over with "<<newtarget<<endl); | |
2075 | ||
2076 | set<GetBestNSAnswer> beenthere2; | |
4d2be65d | 2077 | vState cnameState = Indeterminate; |
ad75fdbd | 2078 | *rcode = doResolve(newtarget, qtype, ret, depth + 1, beenthere2, cnameState, cuts); |
4d2be65d RG |
2079 | LOG("Updating validation state for response to "<<qname<<" from "<<vStates[state]<<" with the state from the CNAME quest: "<<vStates[cnameState]<<endl); |
2080 | updateValidationState(state, cnameState); | |
2081 | ||
6dfff36f RG |
2082 | return true; |
2083 | } | |
2084 | ||
2085 | if(lwr.d_rcode == RCode::NXDomain) { | |
2086 | LOG(prefix<<qname<<": status=NXDOMAIN, we are done "<<(negindic ? "(have negative SOA)" : "")<<endl); | |
2087 | ||
2088 | if(d_doDNSSEC) | |
2089 | addNXNSECS(ret, lwr.d_records); | |
2090 | ||
2091 | *rcode = RCode::NXDomain; | |
2092 | return true; | |
2093 | } | |
2094 | ||
2095 | if(nsset.empty() && !lwr.d_rcode && (negindic || lwr.d_aabit || sendRDQuery)) { | |
2096 | LOG(prefix<<qname<<": status=noerror, other types may exist, but we are done "<<(negindic ? "(have negative SOA) " : "")<<(lwr.d_aabit ? "(have aa bit) " : "")<<endl); | |
2097 | ||
2098 | if(d_doDNSSEC) | |
2099 | addNXNSECS(ret, lwr.d_records); | |
2100 | ||
2101 | *rcode = RCode::NoError; | |
2102 | return true; | |
2103 | } | |
2104 | ||
2105 | if(realreferral) { | |
2106 | LOG(prefix<<qname<<": status=did not resolve, got "<<(unsigned int)nsset.size()<<" NS, "); | |
6dfff36f RG |
2107 | |
2108 | nameservers.clear(); | |
2109 | for (auto const &nameserver : nsset) { | |
2110 | if (d_wantsRPZ) { | |
2111 | d_appliedPolicy = dfe.getProcessingPolicy(nameserver, d_discardedPolicies); | |
2112 | if (d_appliedPolicy.d_kind != DNSFilterEngine::PolicyKind::NoAction) { // client query needs an RPZ response | |
2113 | LOG("however "<<nameserver<<" was blocked by RPZ policy '"<<(d_appliedPolicy.d_name ? *d_appliedPolicy.d_name : "")<<"'"<<endl); | |
2114 | *rcode = -2; | |
2115 | return true; | |
2116 | } | |
2117 | } | |
2118 | nameservers.insert({nameserver, {{}, false}}); | |
2119 | } | |
2120 | LOG("looping to them"<<endl); | |
2121 | *gotNewServers = true; | |
812c3a69 | 2122 | auth=newauth; |
4d2be65d | 2123 | |
6dfff36f RG |
2124 | return false; |
2125 | } | |
2126 | ||
2127 | return false; | |
2128 | } | |
2129 | ||
b8470add PL |
2130 | /** returns: |
2131 | * -1 in case of no results | |
2132 | * -2 when a FilterEngine Policy was hit | |
2133 | * rcode otherwise | |
2134 | */ | |
fa1b87ff | 2135 | int SyncRes::doResolveAt(NsSet &nameservers, DNSName auth, bool flawedNSSet, const DNSName &qname, const QType &qtype, |
e325f20c | 2136 | vector<DNSRecord>&ret, |
ad75fdbd | 2137 | unsigned int depth, set<GetBestNSAnswer>&beenthere, vState& state, SyncRes::zonesStates_t& cuts) |
86c152f2 | 2138 | { |
69cbdef9 | 2139 | auto luaconfsLocal = g_luaconfs.getLocal(); |
ded77b10 | 2140 | string prefix; |
77499b05 | 2141 | if(doLog()) { |
ded77b10 BH |
2142 | prefix=d_prefix; |
2143 | prefix.append(depth, ' '); | |
2144 | } | |
3ddb9247 | 2145 | |
b8470add PL |
2146 | LOG(prefix<<qname<<": Cache consultations done, have "<<(unsigned int)nameservers.size()<<" NS to contact"); |
2147 | ||
69cbdef9 | 2148 | if (nameserversBlockedByRPZ(luaconfsLocal->dfe, nameservers)) { |
26ca3513 | 2149 | return -2; |
b8470add PL |
2150 | } |
2151 | ||
2152 | LOG(endl); | |
afbe2787 BH |
2153 | |
2154 | for(;;) { // we may get more specific nameservers | |
e8b23f3b | 2155 | vector<DNSName > rnameservers = shuffleInSpeedOrder(nameservers, doLog() ? (prefix+qname.toString()+": ") : string() ); |
3ddb9247 | 2156 | |
26ca3513 RG |
2157 | for(auto tns=rnameservers.cbegin();;++tns) { |
2158 | if(tns==rnameservers.cend()) { | |
2189085d | 2159 | LOG(prefix<<qname<<": Failed to resolve via any of the "<<(unsigned int)rnameservers.size()<<" offered NS at level '"<<auth<<"'"<<endl); |
03c09afe | 2160 | if(!auth.isRoot() && flawedNSSet) { |
2189085d | 2161 | LOG(prefix<<qname<<": Ageing nameservers for level '"<<auth<<"', next query might succeed"<<endl); |
88490c03 | 2162 | |
49a699c4 | 2163 | if(t_RC->doAgeCache(d_now.tv_sec, auth, QType::NS, 10)) |
4957a608 BH |
2164 | g_stats.nsSetInvalidations++; |
2165 | } | |
2166 | return -1; | |
afbe2787 | 2167 | } |
6dfff36f | 2168 | |
21f0f88b | 2169 | // this line needs to identify the 'self-resolving' behaviour, but we get it wrong now |
26ca3513 RG |
2170 | if(qname == *tns && qtype.getCode()==QType::A && rnameservers.size() > (size_t)(1+1*s_doIPv6)) { |
2171 | LOG(prefix<<qname<<": Not using NS to resolve itself! ("<<(1+tns-rnameservers.cbegin())<<"/"<<rnameservers.size()<<")"<<endl); | |
4957a608 | 2172 | continue; |
20177d1d | 2173 | } |
5605c067 | 2174 | |
996c89cc | 2175 | typedef vector<ComboAddress> remoteIPs_t; |
5605c067 | 2176 | remoteIPs_t remoteIPs; |
bfea0d0b | 2177 | remoteIPs_t::const_iterator remoteIP; |
1c21f389 | 2178 | bool pierceDontQuery=false; |
c1d73d94 | 2179 | bool sendRDQuery=false; |
376effcf | 2180 | boost::optional<Netmask> ednsmask; |
263f6a5a | 2181 | LWResult lwr; |
6dfff36f RG |
2182 | const bool wasForwarded = tns->empty() && (!nameservers[*tns].first.empty()); |
2183 | int rcode = RCode::NoError; | |
2184 | bool gotNewServers = false; | |
2185 | ||
2186 | if(tns->empty() && !wasForwarded) { | |
2189085d | 2187 | LOG(prefix<<qname<<": Domain is out-of-band"<<endl); |
4d2be65d | 2188 | state = Insecure; |
9fc36e90 | 2189 | d_wasOutOfBand = doOOBResolve(qname, qtype, lwr.d_records, depth, lwr.d_rcode); |
4957a608 BH |
2190 | lwr.d_tcbit=false; |
2191 | lwr.d_aabit=true; | |
6dfff36f RG |
2192 | |
2193 | /* we have received an answer, are we done ? */ | |
70b3fe7a | 2194 | bool done = processAnswer(depth, lwr, qname, qtype, auth, false, ednsmask, sendRDQuery, nameservers, ret, luaconfsLocal->dfe, &gotNewServers, &rcode, state, cuts); |
6dfff36f RG |
2195 | if (done) { |
2196 | return rcode; | |
2197 | } | |
2198 | if (gotNewServers) { | |
2199 | break; | |
2200 | } | |
5605c067 BH |
2201 | } |
2202 | else { | |
6dfff36f | 2203 | /* if tns is empty, retrieveAddressesForNS() knows we have hardcoded servers (i.e. "forwards") */ |
26ca3513 | 2204 | remoteIPs = retrieveAddressesForNS(prefix, qname, tns, depth, beenthere, rnameservers, nameservers, sendRDQuery, pierceDontQuery, flawedNSSet); |
4957a608 BH |
2205 | |
2206 | if(remoteIPs.empty()) { | |
2189085d | 2207 | LOG(prefix<<qname<<": Failed to get IP for NS "<<*tns<<", trying next if available"<<endl); |
4957a608 BH |
2208 | flawedNSSet=true; |
2209 | continue; | |
2210 | } | |
2211 | else { | |
b8470add | 2212 | bool hitPolicy{false}; |
2189085d | 2213 | LOG(prefix<<qname<<": Resolved '"<<auth<<"' NS "<<*tns<<" to: "); |
26ca3513 RG |
2214 | for(remoteIP = remoteIPs.cbegin(); remoteIP != remoteIPs.cend(); ++remoteIP) { |
2215 | if(remoteIP != remoteIPs.cbegin()) { | |
77499b05 BH |
2216 | LOG(", "); |
2217 | } | |
2218 | LOG(remoteIP->toString()); | |
69cbdef9 | 2219 | if(nameserverIPBlockedByRPZ(luaconfsLocal->dfe, *remoteIP)) { |
26ca3513 | 2220 | hitPolicy = true; |
b8470add | 2221 | } |
4957a608 | 2222 | } |
77499b05 | 2223 | LOG(endl); |
b8470add PL |
2224 | if (hitPolicy) //implies d_wantsRPZ |
2225 | return -2; | |
4957a608 BH |
2226 | } |
2227 | ||
26ca3513 | 2228 | for(remoteIP = remoteIPs.cbegin(); remoteIP != remoteIPs.cend(); ++remoteIP) { |
2189085d | 2229 | LOG(prefix<<qname<<": Trying IP "<< remoteIP->toStringWithPort() <<", asking '"<<qname<<"|"<<qtype.getName()<<"'"<<endl); |
6dfff36f | 2230 | |
26ca3513 | 2231 | if (throttledOrBlocked(prefix, *remoteIP, qname, qtype, pierceDontQuery)) { |
4957a608 BH |
2232 | continue; |
2233 | } | |
9de3e034 | 2234 | |
6dfff36f RG |
2235 | bool truncated = false; |
2236 | bool gotAnswer = doResolveAtThisIP(prefix, qname, qtype, lwr, ednsmask, auth, sendRDQuery, | |
2237 | *tns, *remoteIP, false, &truncated); | |
2238 | if (gotAnswer && truncated ) { | |
2239 | /* retry, over TCP this time */ | |
2240 | gotAnswer = doResolveAtThisIP(prefix, qname, qtype, lwr, ednsmask, auth, sendRDQuery, | |
2241 | *tns, *remoteIP, true, &truncated); | |
2242 | } | |
710af846 | 2243 | |
6dfff36f RG |
2244 | if (!gotAnswer) { |
2245 | continue; | |
2246 | } | |
352b4183 | 2247 | |
6dfff36f | 2248 | LOG(prefix<<qname<<": Got "<<(unsigned int)lwr.d_records.size()<<" answers from "<<*tns<<" ("<< remoteIP->toString() <<"), rcode="<<lwr.d_rcode<<" ("<<RCode::to_s(lwr.d_rcode)<<"), aa="<<lwr.d_aabit<<", in "<<lwr.d_usec/1000<<"ms"<<endl); |
92011b8f | 2249 | |
6dfff36f RG |
2250 | /* // for you IPv6 fanatics :-) |
2251 | if(remoteIP->sin4.sin_family==AF_INET6) | |
2252 | lwr.d_usec/=3; | |
2253 | */ | |
2254 | // cout<<"msec: "<<lwr.d_usec/1000.0<<", "<<g_avgLatency/1000.0<<'\n'; | |
710af846 | 2255 | |
6dfff36f | 2256 | t_sstorage.nsSpeeds[*tns].submit(*remoteIP, lwr.d_usec, &d_now); |
628e2c7b | 2257 | |
6dfff36f | 2258 | /* we have received an answer, are we done ? */ |
70b3fe7a | 2259 | bool done = processAnswer(depth, lwr, qname, qtype, auth, wasForwarded, ednsmask, sendRDQuery, nameservers, ret, luaconfsLocal->dfe, &gotNewServers, &rcode, state, cuts); |
6dfff36f RG |
2260 | if (done) { |
2261 | return rcode; | |
4957a608 | 2262 | } |
6dfff36f RG |
2263 | if (gotNewServers) { |
2264 | break; | |
4957a608 | 2265 | } |
6dfff36f RG |
2266 | /* was lame */ |
2267 | t_sstorage.throttle.throttle(d_now.tv_sec, boost::make_tuple(*remoteIP, qname, qtype.getCode()), 60, 100); | |
4957a608 | 2268 | } |
aadceba8 | 2269 | |
6dfff36f RG |
2270 | if (gotNewServers) { |
2271 | break; | |
4957a608 | 2272 | } |
620db2c8 | 2273 | |
6dfff36f RG |
2274 | if(remoteIP == remoteIPs.cend()) // we tried all IP addresses, none worked |
2275 | continue; | |
620db2c8 | 2276 | |
86c152f2 BH |
2277 | } |
2278 | } | |
86c152f2 | 2279 | } |
ac539791 | 2280 | return -1; |
86c152f2 BH |
2281 | } |
2282 | ||
e9f9b8ec RG |
2283 | boost::optional<Netmask> SyncRes::getEDNSSubnetMask(const ComboAddress& local, const DNSName&dn, const ComboAddress& rem) |
2284 | { | |
2285 | boost::optional<Netmask> result; | |
2286 | ComboAddress trunc; | |
2287 | uint8_t bits; | |
2288 | if(d_incomingECSFound) { | |
2289 | if (d_incomingECS->source.getBits() == 0) { | |
2290 | /* RFC7871 says we MUST NOT send any ECS if the source scope is 0 */ | |
2291 | return result; | |
2292 | } | |
2293 | trunc = d_incomingECS->source.getMaskedNetwork(); | |
2294 | bits = d_incomingECS->source.getBits(); | |
2295 | } | |
2296 | else if(!local.isIPv4() || local.sin4.sin_addr.s_addr) { // detect unset 'requestor' | |
2297 | trunc = local; | |
2298 | bits = local.isIPv4() ? 32 : 128; | |
2299 | } | |
2300 | else { | |
2301 | /* nothing usable */ | |
2302 | return result; | |
2303 | } | |
2304 | ||
9065eb05 | 2305 | if(s_ednsdomains.check(dn) || s_ednssubnets.match(rem)) { |
e9f9b8ec RG |
2306 | bits = std::min(bits, (trunc.isIPv4() ? s_ecsipv4limit : s_ecsipv6limit)); |
2307 | trunc.truncate(bits); | |
2308 | return boost::optional<Netmask>(Netmask(trunc, bits)); | |
2309 | } | |
2310 | ||
2311 | return result; | |
2312 | } | |
bd53ea9d | 2313 | |
9065eb05 RG |
2314 | void SyncRes::parseEDNSSubnetWhitelist(const std::string& wlist) |
2315 | { | |
2316 | vector<string> parts; | |
2317 | stringtok(parts, wlist, ",; "); | |
2318 | for(const auto& a : parts) { | |
2319 | try { | |
2320 | s_ednssubnets.addMask(Netmask(a)); | |
2321 | } | |
2322 | catch(...) { | |
2323 | s_ednsdomains.add(DNSName(a)); | |
2324 | } | |
2325 | } | |
2326 | } | |
2327 | ||
8ce79a22 | 2328 | // used by PowerDNSLua - note that this neglects to add the packet count & statistics back to pdns_ercursor.cc |
a3e7b735 | 2329 | int directResolve(const DNSName& qname, const QType& qtype, int qclass, vector<DNSRecord>& ret) |
bd53ea9d PD |
2330 | { |
2331 | struct timeval now; | |
2332 | gettimeofday(&now, 0); | |
710af846 | 2333 | |
bd53ea9d | 2334 | SyncRes sr(now); |
a3e7b735 | 2335 | int res = sr.beginResolve(qname, QType(qtype), qclass, ret); |
e325f20c | 2336 | |
bd53ea9d PD |
2337 | return res; |
2338 | } | |
30ee601a | 2339 | |
30ee601a RG |
2340 | int SyncRes::getRootNS(struct timeval now, asyncresolve_t asyncCallback) { |
2341 | SyncRes sr(now); | |
2342 | sr.setDoEDNS0(true); | |
0b29b9c5 | 2343 | sr.setUpdatingRootNS(); |
30ee601a RG |
2344 | sr.setDoDNSSEC(g_dnssecmode != DNSSECMode::Off); |
2345 | sr.setAsyncCallback(asyncCallback); | |
2346 | ||
2347 | vector<DNSRecord> ret; | |
2348 | int res=-1; | |
2349 | try { | |
2350 | res=sr.beginResolve(g_rootdnsname, QType(QType::NS), 1, ret); | |
2351 | if (g_dnssecmode != DNSSECMode::Off && g_dnssecmode != DNSSECMode::ProcessNoValidate) { | |
4d2be65d | 2352 | auto state = sr.getValidationState(); |
30ee601a RG |
2353 | if (state == Bogus) |
2354 | throw PDNSException("Got Bogus validation result for .|NS"); | |
2355 | } | |
2356 | return res; | |
2357 | } | |
c78ceb39 | 2358 | catch(const PDNSException& e) { |
30ee601a RG |
2359 | L<<Logger::Error<<"Failed to update . records, got an exception: "<<e.reason<<endl; |
2360 | } | |
c78ceb39 RG |
2361 | catch(const ImmediateServFailException& e) { |
2362 | L<<Logger::Error<<"Failed to update . records, got an exception: "<<e.reason<<endl; | |
2363 | } | |
2364 | catch(const std::exception& e) { | |
30ee601a RG |
2365 | L<<Logger::Error<<"Failed to update . records, got an exception: "<<e.what()<<endl; |
2366 | } | |
c78ceb39 | 2367 | catch(...) { |
30ee601a RG |
2368 | L<<Logger::Error<<"Failed to update . records, got an exception"<<endl; |
2369 | } | |
c78ceb39 | 2370 | |
30ee601a RG |
2371 | if(!res) { |
2372 | L<<Logger::Notice<<"Refreshed . records"<<endl; | |
2373 | } | |
2374 | else | |
2375 | L<<Logger::Error<<"Failed to update . records, RCODE="<<res<<endl; | |
c78ceb39 | 2376 | |
30ee601a RG |
2377 | return res; |
2378 | } |