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Commit | Line | Data |
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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" |
1e332f68 | 36 | #include "dnsseckeeper.hh" |
4d2be65d | 37 | #include "validate-recursor.hh" |
6dfff36f | 38 | |
a712cb56 | 39 | thread_local SyncRes::ThreadLocalStorage SyncRes::t_sstorage; |
be9078b3 | 40 | thread_local std::unique_ptr<addrringbuf_t> t_timeouts; |
bb4bdbaf | 41 | |
3337c2f7 RG |
42 | std::unordered_set<DNSName> SyncRes::s_delegationOnly; |
43 | std::unique_ptr<NetmaskGroup> SyncRes::s_dontQuery{nullptr}; | |
2fe3354d CH |
44 | NetmaskGroup SyncRes::s_ednslocalsubnets; |
45 | NetmaskGroup SyncRes::s_ednsremotesubnets; | |
3337c2f7 | 46 | SuffixMatchNode SyncRes::s_ednsdomains; |
8a3a3822 | 47 | EDNSSubnetOpts SyncRes::s_ecsScopeZero; |
3337c2f7 RG |
48 | string SyncRes::s_serverID; |
49 | SyncRes::LogMode SyncRes::s_lm; | |
50 | ||
a9af3782 | 51 | unsigned int SyncRes::s_maxnegttl; |
c3e753c7 | 52 | unsigned int SyncRes::s_maxcachettl; |
3337c2f7 RG |
53 | unsigned int SyncRes::s_maxqperq; |
54 | unsigned int SyncRes::s_maxtotusec; | |
55 | unsigned int SyncRes::s_maxdepth; | |
56 | unsigned int SyncRes::s_minimumTTL; | |
1051f8a9 BH |
57 | unsigned int SyncRes::s_packetcachettl; |
58 | unsigned int SyncRes::s_packetcacheservfailttl; | |
628e2c7b PA |
59 | unsigned int SyncRes::s_serverdownmaxfails; |
60 | unsigned int SyncRes::s_serverdownthrottletime; | |
e9a628a2 | 61 | std::atomic<uint64_t> SyncRes::s_authzonequeries; |
aebb81e4 | 62 | std::atomic<uint64_t> SyncRes::s_queries; |
63 | std::atomic<uint64_t> SyncRes::s_outgoingtimeouts; | |
64 | std::atomic<uint64_t> SyncRes::s_outgoing4timeouts; | |
65 | std::atomic<uint64_t> SyncRes::s_outgoing6timeouts; | |
66 | std::atomic<uint64_t> SyncRes::s_outqueries; | |
67 | std::atomic<uint64_t> SyncRes::s_tcpoutqueries; | |
68 | std::atomic<uint64_t> SyncRes::s_throttledqueries; | |
69 | std::atomic<uint64_t> SyncRes::s_dontqueries; | |
70 | std::atomic<uint64_t> SyncRes::s_nodelegated; | |
71 | std::atomic<uint64_t> SyncRes::s_unreachables; | |
d6923beb | 72 | std::atomic<uint64_t> SyncRes::s_ecsqueries; |
73 | std::atomic<uint64_t> SyncRes::s_ecsresponses; | |
e9f9b8ec RG |
74 | uint8_t SyncRes::s_ecsipv4limit; |
75 | uint8_t SyncRes::s_ecsipv6limit; | |
996c89cc | 76 | bool SyncRes::s_doIPv6; |
1051f8a9 | 77 | bool SyncRes::s_nopacketcache; |
01402d56 | 78 | bool SyncRes::s_rootNXTrust; |
3337c2f7 | 79 | bool SyncRes::s_noEDNS; |
c836dc19 | 80 | |
e6a9dde5 | 81 | #define LOG(x) if(d_lm == Log) { g_log <<Logger::Warning << x; } else if(d_lm == Store) { d_trace << x; } |
728485ca | 82 | |
69cbdef9 | 83 | static void accountAuthLatency(int usec, int family) |
11adfdd3 | 84 | { |
7b75810e | 85 | if(family == AF_INET) { |
86 | if(usec < 1000) | |
87 | g_stats.auth4Answers0_1++; | |
88 | else if(usec < 10000) | |
89 | g_stats.auth4Answers1_10++; | |
90 | else if(usec < 100000) | |
91 | g_stats.auth4Answers10_100++; | |
92 | else if(usec < 1000000) | |
93 | g_stats.auth4Answers100_1000++; | |
94 | else | |
95 | g_stats.auth4AnswersSlow++; | |
96 | } else { | |
97 | if(usec < 1000) | |
98 | g_stats.auth6Answers0_1++; | |
99 | else if(usec < 10000) | |
100 | g_stats.auth6Answers1_10++; | |
101 | else if(usec < 100000) | |
102 | g_stats.auth6Answers10_100++; | |
103 | else if(usec < 1000000) | |
104 | g_stats.auth6Answers100_1000++; | |
105 | else | |
106 | g_stats.auth6AnswersSlow++; | |
107 | } | |
108 | ||
11adfdd3 | 109 | } |
110 | ||
4465e941 | 111 | |
14d9aade | 112 | SyncRes::SyncRes(const struct timeval& now) : d_authzonequeries(0), d_outqueries(0), d_tcpoutqueries(0), d_throttledqueries(0), d_timeouts(0), d_unreachables(0), |
30ee601a | 113 | d_totUsec(0), d_now(now), |
0b29b9c5 | 114 | d_cacheonly(false), d_doDNSSEC(false), d_doEDNS0(false), d_lm(s_lm) |
232f0877 | 115 | |
ac0e821b | 116 | { |
ac0e821b BH |
117 | } |
118 | ||
728485ca | 119 | /** everything begins here - this is the entry point just after receiving a packet */ |
e325f20c | 120 | int SyncRes::beginResolve(const DNSName &qname, const QType &qtype, uint16_t qclass, vector<DNSRecord>&ret) |
728485ca | 121 | { |
4d2be65d | 122 | vState state = Indeterminate; |
c836dc19 | 123 | s_queries++; |
3762e821 | 124 | d_wasVariable=false; |
9fc36e90 | 125 | d_wasOutOfBand=false; |
710af846 | 126 | |
4d2be65d | 127 | if (doSpecialNamesResolve(qname, qtype, qclass, ret)) { |
d04ac108 | 128 | d_queryValidationState = Insecure; // this could fool our stats into thinking a validation took place |
129 | return 0; // so do check before updating counters (we do now) | |
4d2be65d | 130 | } |
db50a7f4 | 131 | |
1f03b691 | 132 | if( (qtype.getCode() == QType::AXFR) || (qtype.getCode() == QType::IXFR) || (qtype.getCode() == QType::RRSIG) || (qtype.getCode() == QType::NSEC3)) |
693dbe65 | 133 | return -1; |
710af846 | 134 | |
db50a7f4 PL |
135 | if(qclass==QClass::ANY) |
136 | qclass=QClass::IN; | |
137 | else if(qclass!=QClass::IN) | |
138 | return -1; | |
8171ab83 | 139 | |
db50a7f4 | 140 | set<GetBestNSAnswer> beenthere; |
51b6b728 | 141 | int res=doResolve(qname, qtype, ret, 0, beenthere, state); |
4d2be65d | 142 | d_queryValidationState = state; |
0c43f455 | 143 | |
e1636f82 | 144 | if (shouldValidate()) { |
3b54c577 | 145 | if (d_queryValidationState != Indeterminate) { |
146 | g_stats.dnssecValidations++; | |
147 | } | |
0c43f455 RG |
148 | increaseDNSSECStateCounter(d_queryValidationState); |
149 | } | |
150 | ||
db50a7f4 PL |
151 | return res; |
152 | } | |
153 | ||
154 | /*! Handles all special, built-in names | |
155 | * Fills ret with an answer and returns true if it handled the query. | |
156 | * | |
d03c1b70 | 157 | * Handles the following queries (and their ANY variants): |
db50a7f4 PL |
158 | * |
159 | * - localhost. IN A | |
160 | * - localhost. IN AAAA | |
161 | * - 1.0.0.127.in-addr.arpa. IN PTR | |
162 | * - 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 | |
163 | * - version.bind. CH TXT | |
164 | * - version.pdns. CH TXT | |
165 | * - id.server. CH TXT | |
db50a7f4 | 166 | */ |
6dfff36f | 167 | bool SyncRes::doSpecialNamesResolve(const DNSName &qname, const QType &qtype, const uint16_t qclass, vector<DNSRecord> &ret) |
db50a7f4 PL |
168 | { |
169 | 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."), | |
170 | localhost("localhost."), versionbind("version.bind."), idserver("id.server."), versionpdns("version.pdns."); | |
171 | ||
172 | bool handled = false; | |
d03c1b70 | 173 | vector<pair<QType::typeenum, string> > answers; |
db50a7f4 | 174 | |
d03c1b70 PL |
175 | if ((qname == arpa || qname == ip6_arpa) && |
176 | qclass == QClass::IN) { | |
db50a7f4 | 177 | handled = true; |
d03c1b70 PL |
178 | if (qtype == QType::PTR || qtype == QType::ANY) |
179 | answers.push_back({QType::PTR, "localhost."}); | |
db50a7f4 PL |
180 | } |
181 | ||
d03c1b70 PL |
182 | if (qname == localhost && |
183 | qclass == QClass::IN) { | |
db50a7f4 | 184 | handled = true; |
d03c1b70 PL |
185 | if (qtype == QType::A || qtype == QType::ANY) |
186 | answers.push_back({QType::A, "127.0.0.1"}); | |
187 | if (qtype == QType::AAAA || qtype == QType::ANY) | |
188 | answers.push_back({QType::AAAA, "::1"}); | |
db50a7f4 PL |
189 | } |
190 | ||
d03c1b70 PL |
191 | if ((qname == versionbind || qname == idserver || qname == versionpdns) && |
192 | qclass == QClass::CHAOS) { | |
db50a7f4 | 193 | handled = true; |
d03c1b70 PL |
194 | if (qtype == QType::TXT || qtype == QType::ANY) { |
195 | if(qname == versionbind || qname == versionpdns) | |
196 | answers.push_back({QType::TXT, "\""+::arg()["version-string"]+"\""}); | |
950626be | 197 | else if (s_serverID != "disabled") |
d03c1b70 PL |
198 | answers.push_back({QType::TXT, "\""+s_serverID+"\""}); |
199 | } | |
31ad43ab BH |
200 | } |
201 | ||
d03c1b70 | 202 | if (handled && !answers.empty()) { |
a9af3782 | 203 | ret.clear(); |
db50a7f4 PL |
204 | d_wasOutOfBand=true; |
205 | ||
e325f20c | 206 | DNSRecord dr; |
db50a7f4 | 207 | dr.d_name = qname; |
e693ff5a | 208 | dr.d_place = DNSResourceRecord::ANSWER; |
db50a7f4 PL |
209 | dr.d_class = qclass; |
210 | dr.d_ttl = 86400; | |
d03c1b70 PL |
211 | for (const auto& ans : answers) { |
212 | dr.d_type = ans.first; | |
6177a176 | 213 | dr.d_content = DNSRecordContent::mastermake(ans.first, qclass, ans.second); |
d03c1b70 PL |
214 | ret.push_back(dr); |
215 | } | |
a9af3782 | 216 | } |
710af846 | 217 | |
db50a7f4 | 218 | return handled; |
728485ca | 219 | } |
afbe2787 | 220 | |
db50a7f4 | 221 | |
ab5c053d | 222 | //! This is the 'out of band resolver', in other words, the authoritative server |
3337c2f7 | 223 | void SyncRes::AuthDomain::addSOA(std::vector<DNSRecord>& records) const |
e93c956b | 224 | { |
3337c2f7 RG |
225 | SyncRes::AuthDomain::records_t::const_iterator ziter = d_records.find(boost::make_tuple(getName(), QType::SOA)); |
226 | if (ziter != d_records.end()) { | |
227 | DNSRecord dr = *ziter; | |
228 | dr.d_place = DNSResourceRecord::AUTHORITY; | |
229 | records.push_back(dr); | |
5605c067 | 230 | } |
3337c2f7 RG |
231 | else { |
232 | // cerr<<qname<<": can't find SOA record '"<<getName()<<"' in our zone!"<<endl; | |
233 | } | |
234 | } | |
5605c067 | 235 | |
3337c2f7 RG |
236 | int SyncRes::AuthDomain::getRecords(const DNSName& qname, uint16_t qtype, std::vector<DNSRecord>& records) const |
237 | { | |
238 | int result = RCode::NoError; | |
239 | records.clear(); | |
5605c067 | 240 | |
3337c2f7 RG |
241 | // partial lookup |
242 | std::pair<records_t::const_iterator,records_t::const_iterator> range = d_records.equal_range(tie(qname)); | |
243 | ||
244 | SyncRes::AuthDomain::records_t::const_iterator ziter; | |
245 | bool somedata = false; | |
246 | ||
247 | for(ziter = range.first; ziter != range.second; ++ziter) { | |
248 | somedata = true; | |
249 | ||
250 | if(qtype == QType::ANY || ziter->d_type == qtype || ziter->d_type == QType::CNAME) { | |
251 | // let rest of nameserver do the legwork on this one | |
252 | records.push_back(*ziter); | |
253 | } | |
254 | else if (ziter->d_type == QType::NS && ziter->d_name.countLabels() > getName().countLabels()) { | |
255 | // we hit a delegation point! | |
256 | DNSRecord dr = *ziter; | |
39eb8051 | 257 | dr.d_place=DNSResourceRecord::AUTHORITY; |
3337c2f7 | 258 | records.push_back(dr); |
39eb8051 | 259 | } |
5605c067 | 260 | } |
3337c2f7 RG |
261 | |
262 | if (!records.empty()) { | |
263 | /* We have found an exact match, we're done */ | |
264 | // cerr<<qname<<": exact match in zone '"<<getName()<<"'"<<endl; | |
265 | return result; | |
5605c067 | 266 | } |
3337c2f7 RG |
267 | |
268 | if (somedata) { | |
269 | /* We have records for that name, but not of the wanted qtype */ | |
270 | // cerr<<qname<<": found record in '"<<getName()<<"', but nothing of the right type, sending SOA"<<endl; | |
271 | addSOA(records); | |
272 | ||
273 | return result; | |
9e9844e2 | 274 | } |
5605c067 | 275 | |
3337c2f7 | 276 | // cerr<<qname<<": nothing found so far in '"<<getName()<<"', trying wildcards"<<endl; |
c5c066bf | 277 | DNSName wcarddomain(qname); |
3337c2f7 RG |
278 | while(wcarddomain != getName() && wcarddomain.chopOff()) { |
279 | // cerr<<qname<<": trying '*."<<wcarddomain<<"' in "<<getName()<<endl; | |
280 | range = d_records.equal_range(boost::make_tuple(g_wildcarddnsname + wcarddomain)); | |
281 | if (range.first==range.second) | |
0d1e259a BH |
282 | continue; |
283 | ||
3337c2f7 RG |
284 | for(ziter = range.first; ziter != range.second; ++ziter) { |
285 | DNSRecord dr = *ziter; | |
0f05b02b | 286 | // if we hit a CNAME, just answer that - rest of recursor will do the needful & follow |
3337c2f7 | 287 | if(dr.d_type == qtype || qtype == QType::ANY || dr.d_type == QType::CNAME) { |
e325f20c | 288 | dr.d_name = qname; |
3337c2f7 RG |
289 | dr.d_place = DNSResourceRecord::ANSWER; |
290 | records.push_back(dr); | |
0d1e259a BH |
291 | } |
292 | } | |
3337c2f7 RG |
293 | |
294 | if (records.empty()) { | |
295 | addSOA(records); | |
296 | } | |
297 | ||
298 | // cerr<<qname<<": in '"<<getName()<<"', had wildcard match on '*."<<wcarddomain<<"'"<<endl; | |
299 | return result; | |
0d1e259a BH |
300 | } |
301 | ||
3337c2f7 | 302 | /* Nothing for this name, no wildcard, let's see if there is some NS */ |
c5c066bf | 303 | DNSName nsdomain(qname); |
3337c2f7 RG |
304 | while (nsdomain.chopOff() && nsdomain != getName()) { |
305 | range = d_records.equal_range(boost::make_tuple(nsdomain,QType::NS)); | |
306 | if(range.first == range.second) | |
5605c067 BH |
307 | continue; |
308 | ||
3337c2f7 RG |
309 | for(ziter = range.first; ziter != range.second; ++ziter) { |
310 | DNSRecord dr = *ziter; | |
311 | dr.d_place = DNSResourceRecord::AUTHORITY; | |
312 | records.push_back(dr); | |
5605c067 BH |
313 | } |
314 | } | |
3337c2f7 RG |
315 | |
316 | if(records.empty()) { | |
317 | // cerr<<qname<<": no NS match in zone '"<<getName()<<"' either, handing out SOA"<<endl; | |
318 | addSOA(records); | |
319 | result = RCode::NXDomain; | |
5605c067 | 320 | } |
5605c067 | 321 | |
3337c2f7 RG |
322 | return result; |
323 | } | |
324 | ||
f7b8cffa | 325 | bool SyncRes::doOOBResolve(const AuthDomain& domain, const DNSName &qname, const QType &qtype, vector<DNSRecord>&ret, int& res) |
3337c2f7 | 326 | { |
f7b8cffa | 327 | d_authzonequeries++; |
e9a628a2 | 328 | s_authzonequeries++; |
f7b8cffa | 329 | |
3337c2f7 | 330 | res = domain.getRecords(qname, qtype.getCode(), ret); |
9e9844e2 | 331 | return true; |
e93c956b BH |
332 | } |
333 | ||
3337c2f7 RG |
334 | bool SyncRes::doOOBResolve(const DNSName &qname, const QType &qtype, vector<DNSRecord>&ret, unsigned int depth, int& res) |
335 | { | |
336 | string prefix; | |
337 | if(doLog()) { | |
338 | prefix=d_prefix; | |
339 | prefix.append(depth, ' '); | |
340 | } | |
341 | ||
342 | DNSName authdomain(qname); | |
343 | domainmap_t::const_iterator iter=getBestAuthZone(&authdomain); | |
344 | if(iter==t_sstorage.domainmap->end() || !iter->second.isAuth()) { | |
345 | LOG(prefix<<qname<<": auth storage has no zone for this query!"<<endl); | |
346 | return false; | |
347 | } | |
348 | ||
349 | LOG(prefix<<qname<<": auth storage has data, zone='"<<authdomain<<"'"<<endl); | |
350 | return doOOBResolve(iter->second, qname, qtype, ret, res); | |
351 | } | |
352 | ||
ff1872cf BH |
353 | void SyncRes::doEDNSDumpAndClose(int fd) |
354 | { | |
355 | FILE* fp=fdopen(fd, "w"); | |
a82f68f0 RG |
356 | if (!fp) { |
357 | return; | |
358 | } | |
ff1872cf | 359 | fprintf(fp,"IP Address\tMode\tMode last updated at\n"); |
a712cb56 | 360 | for(const auto& eds : t_sstorage.ednsstatus) { |
57769f13 | 361 | fprintf(fp, "%s\t%d\t%s", eds.first.toString().c_str(), (int)eds.second.mode, ctime(&eds.second.modeSetAt)); |
ff1872cf | 362 | } |
bb4bdbaf | 363 | |
ff1872cf BH |
364 | fclose(fp); |
365 | } | |
366 | ||
9065eb05 RG |
367 | uint64_t SyncRes::doDumpNSSpeeds(int fd) |
368 | { | |
369 | FILE* fp=fdopen(dup(fd), "w"); | |
370 | if(!fp) | |
371 | return 0; | |
372 | fprintf(fp, "; nsspeed dump from thread follows\n;\n"); | |
373 | uint64_t count=0; | |
374 | ||
a712cb56 | 375 | for(const auto& i : t_sstorage.nsSpeeds) |
9065eb05 RG |
376 | { |
377 | count++; | |
a2d65f83 | 378 | |
379 | // an <empty> can appear hear in case of authoritative (hosted) zones | |
380 | fprintf(fp, "%s -> ", i.first.toLogString().c_str()); | |
9065eb05 RG |
381 | for(const auto& j : i.second.d_collection) |
382 | { | |
383 | // typedef vector<pair<ComboAddress, DecayingEwma> > collection_t; | |
384 | fprintf(fp, "%s/%f ", j.first.toString().c_str(), j.second.peek()); | |
385 | } | |
386 | fprintf(fp, "\n"); | |
387 | } | |
388 | fclose(fp); | |
389 | return count; | |
390 | } | |
391 | ||
c1e20fba | 392 | uint64_t SyncRes::doDumpThrottleMap(int fd) |
393 | { | |
394 | FILE* fp=fdopen(dup(fd), "w"); | |
395 | if(!fp) | |
396 | return 0; | |
397 | fprintf(fp, "; throttle map dump follows\n"); | |
96e2f64f | 398 | fprintf(fp, "; remote IP\tqname\tqtype\tcount\tttd\n"); |
c1e20fba | 399 | uint64_t count=0; |
400 | ||
96e2f64f | 401 | const auto& throttleMap = t_sstorage.throttle.getThrottleMap(); |
402 | for(const auto& i : throttleMap) | |
c1e20fba | 403 | { |
404 | count++; | |
96e2f64f | 405 | // remote IP, dns name, qtype, count, ttd |
bca7b789 | 406 | fprintf(fp, "%s\t%s\t%d\t%u\t%s", i.first.get<0>().toString().c_str(), i.first.get<1>().toLogString().c_str(), i.first.get<2>(), i.second.count, ctime(&i.second.ttd)); |
c1e20fba | 407 | } |
408 | fclose(fp); | |
409 | return count; | |
410 | } | |
411 | ||
9d534f2a | 412 | /* so here is the story. First we complete the full resolution process for a domain name. And only THEN do we decide |
413 | to also do DNSSEC validation, which leads to new queries. To make this simple, we *always* ask for DNSSEC records | |
414 | so that if there are RRSIGs for a name, we'll have them. | |
415 | ||
416 | However, some hosts simply can't answer questions which ask for DNSSEC. This can manifest itself as: | |
417 | * No answer | |
418 | * FormErr | |
419 | * Nonsense answer | |
420 | ||
421 | The cause of "No answer" may be fragmentation, and it is tempting to probe if smaller answers would get through. | |
422 | Another cause of "No answer" may simply be a network condition. | |
423 | Nonsense answers are a clearer indication this host won't be able to do DNSSEC evah. | |
424 | ||
425 | Previous implementations have suffered from turning off DNSSEC questions for an authoritative server based on timeouts. | |
426 | A clever idea is to only turn off DNSSEC if we know a domain isn't signed anyhow. The problem with that really | |
427 | clever idea however is that at this point in PowerDNS, we may simply not know that yet. All the DNSSEC thinking happens | |
428 | elsewhere. It may not have happened yet. | |
429 | ||
430 | For now this means we can't be clever, but will turn off DNSSEC if you reply with FormError or gibberish. | |
431 | */ | |
432 | ||
deca7d8f | 433 | 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, bool* chained) const |
81883dcc BH |
434 | { |
435 | /* what is your QUEST? | |
57769f13 | 436 | the goal is to get as many remotes as possible on the highest level of EDNS support |
81883dcc BH |
437 | The levels are: |
438 | ||
81883dcc | 439 | 0) UNKNOWN Unknown state |
57769f13 | 440 | 1) EDNS: Honors EDNS0 |
441 | 2) EDNSIGNORANT: Ignores EDNS0, gives replies without EDNS0 | |
269ac73d | 442 | 3) NOEDNS: Generates FORMERR on EDNS queries |
81883dcc BH |
443 | |
444 | Everybody starts out assumed to be '0'. | |
57769f13 | 445 | If '0', send out EDNS0 |
446 | If you FORMERR us, go to '3', | |
447 | If no EDNS in response, go to '2' | |
448 | If '1', send out EDNS0 | |
449 | If FORMERR, downgrade to 3 | |
450 | If '2', keep on including EDNS0, see what happens | |
81883dcc | 451 | Same behaviour as 0 |
57769f13 | 452 | If '3', send bare queries |
81883dcc BH |
453 | */ |
454 | ||
bb4bdbaf | 455 | SyncRes::EDNSStatus* ednsstatus; |
a712cb56 | 456 | ednsstatus = &t_sstorage.ednsstatus[ip]; // does this include port? YES |
81883dcc | 457 | |
bb4bdbaf BH |
458 | if(ednsstatus->modeSetAt && ednsstatus->modeSetAt + 3600 < d_now.tv_sec) { |
459 | *ednsstatus=SyncRes::EDNSStatus(); | |
77499b05 | 460 | // cerr<<"Resetting EDNS Status for "<<ip.toString()<<endl); |
81883dcc BH |
461 | } |
462 | ||
bb4bdbaf | 463 | SyncRes::EDNSStatus::EDNSMode& mode=ednsstatus->mode; |
81883dcc | 464 | SyncRes::EDNSStatus::EDNSMode oldmode = mode; |
fe61f5d8 | 465 | int EDNSLevel = 0; |
4898a348 RG |
466 | auto luaconfsLocal = g_luaconfs.getLocal(); |
467 | ResolveContext ctx; | |
468 | #ifdef HAVE_PROTOBUF | |
469 | ctx.d_initialRequestId = d_initialRequestId; | |
470 | #endif | |
81883dcc BH |
471 | |
472 | int ret; | |
ff1872cf | 473 | for(int tries = 0; tries < 3; ++tries) { |
e325f20c | 474 | // cerr<<"Remote '"<<ip.toString()<<"' currently in mode "<<mode<<endl; |
57769f13 | 475 | |
9d534f2a | 476 | if(mode==EDNSStatus::NOEDNS) { |
81883dcc | 477 | g_stats.noEdnsOutQueries++; |
9d534f2a | 478 | EDNSLevel = 0; // level != mode |
81883dcc | 479 | } |
9d534f2a | 480 | else if(ednsMANDATORY || mode==EDNSStatus::UNKNOWN || mode==EDNSStatus::EDNSOK || mode==EDNSStatus::EDNSIGNORANT) |
481 | EDNSLevel = 1; | |
30ee601a | 482 | |
c1c29961 PL |
483 | DNSName sendQname(domain); |
484 | if (g_lowercaseOutgoing) | |
485 | sendQname.makeUsLowerCase(); | |
486 | ||
30ee601a | 487 | if (d_asyncResolve) { |
0bd2e252 | 488 | ret = d_asyncResolve(ip, sendQname, type, doTCP, sendRDQuery, EDNSLevel, now, srcmask, ctx, res, chained); |
30ee601a RG |
489 | } |
490 | else { | |
0bd2e252 | 491 | ret=asyncresolve(ip, sendQname, type, doTCP, sendRDQuery, EDNSLevel, now, srcmask, ctx, d_outgoingProtobufServer, luaconfsLocal->outgoingProtobufExportConfig.exportTypes, res, chained); |
30ee601a | 492 | } |
9d534f2a | 493 | if(ret < 0) { |
494 | return ret; // transport error, nothing to learn here | |
495 | } | |
57769f13 | 496 | |
9d534f2a | 497 | if(ret == 0) { // timeout, not doing anything with it now |
81883dcc BH |
498 | return ret; |
499 | } | |
57769f13 | 500 | else if(mode==EDNSStatus::UNKNOWN || mode==EDNSStatus::EDNSOK || mode == EDNSStatus::EDNSIGNORANT ) { |
269ac73d | 501 | if(res->d_validpacket && res->d_rcode == RCode::FormErr) { |
2189085d | 502 | // cerr<<"Downgrading to NOEDNS because of "<<RCode::to_s(res->d_rcode)<<" for query to "<<ip.toString()<<" for '"<<domain<<"'"<<endl; |
57769f13 | 503 | mode = EDNSStatus::NOEDNS; |
4957a608 | 504 | continue; |
81883dcc | 505 | } |
81883dcc | 506 | else if(!res->d_haveEDNS) { |
4957a608 BH |
507 | if(mode != EDNSStatus::EDNSIGNORANT) { |
508 | mode = EDNSStatus::EDNSIGNORANT; | |
269ac73d | 509 | // cerr<<"We find that "<<ip.toString()<<" is an EDNS-ignorer for '"<<domain<<"', moving to mode 2"<<endl; |
57769f13 | 510 | } |
81883dcc | 511 | } |
57769f13 | 512 | else { |
513 | mode = EDNSStatus::EDNSOK; | |
e325f20c | 514 | // cerr<<"We find that "<<ip.toString()<<" is EDNS OK!"<<endl; |
81883dcc | 515 | } |
57769f13 | 516 | |
81883dcc | 517 | } |
12ce523e | 518 | if(oldmode != mode || !ednsstatus->modeSetAt) |
bb4bdbaf | 519 | ednsstatus->modeSetAt=d_now.tv_sec; |
e325f20c | 520 | // cerr<<"Result: ret="<<ret<<", EDNS-level: "<<EDNSLevel<<", haveEDNS: "<<res->d_haveEDNS<<", new mode: "<<mode<<endl; |
81883dcc BH |
521 | return ret; |
522 | } | |
523 | return ret; | |
524 | } | |
525 | ||
b88526ce PL |
526 | /*! This function will check the cache and go out to the internet if the answer is not in cache |
527 | * | |
528 | * \param qname The name we need an answer for | |
529 | * \param qtype | |
530 | * \param ret The vector of DNSRecords we need to fill with the answers | |
531 | * \param depth The recursion depth we are in | |
532 | * \param beenthere | |
533 | * \return DNS RCODE or -1 (Error) or -2 (RPZ hit) | |
534 | */ | |
51b6b728 | 535 | int SyncRes::doResolve(const DNSName &qname, const QType &qtype, vector<DNSRecord>&ret, unsigned int depth, set<GetBestNSAnswer>& beenthere, vState& state) |
afbe2787 | 536 | { |
ded77b10 | 537 | string prefix; |
77499b05 | 538 | if(doLog()) { |
ded77b10 BH |
539 | prefix=d_prefix; |
540 | prefix.append(depth, ' '); | |
541 | } | |
b8470add | 542 | |
4d2be65d RG |
543 | LOG(prefix<<qname<<": Wants "<< (d_doDNSSEC ? "" : "NO ") << "DNSSEC processing, "<<(d_requireAuthData ? "" : "NO ")<<"auth data in query for "<<qtype.getName()<<endl); |
544 | ||
545 | state = Indeterminate; | |
710af846 | 546 | |
7c3398aa RG |
547 | if(s_maxdepth && depth > s_maxdepth) |
548 | throw ImmediateServFailException("More than "+std::to_string(s_maxdepth)+" (max-recursion-depth) levels of recursion needed while resolving "+qname.toLogString()); | |
549 | ||
f4df5e89 | 550 | int res=0; |
b88526ce PL |
551 | |
552 | // This is a difficult way of expressing "this is a normal query", i.e. not getRootNS. | |
0b29b9c5 | 553 | if(!(d_updatingRootNS && qtype.getCode()==QType::NS && qname.isRoot())) { |
115d07ad | 554 | if(d_cacheonly) { // very limited OOB support |
263f6a5a | 555 | LWResult lwr; |
2189085d | 556 | LOG(prefix<<qname<<": Recursion not requested for '"<<qname<<"|"<<qtype.getName()<<"', peeking at auth/forward zones"<<endl); |
c5c066bf | 557 | DNSName authname(qname); |
115d07ad | 558 | domainmap_t::const_iterator iter=getBestAuthZone(&authname); |
a712cb56 | 559 | if(iter != t_sstorage.domainmap->end()) { |
3337c2f7 | 560 | if(iter->second.isAuth()) { |
4957a608 | 561 | ret.clear(); |
9fc36e90 | 562 | d_wasOutOfBand = doOOBResolve(qname, qtype, ret, depth, res); |
4957a608 BH |
563 | return res; |
564 | } | |
565 | else { | |
3337c2f7 | 566 | const vector<ComboAddress>& servers = iter->second.d_servers; |
4957a608 | 567 | const ComboAddress remoteIP = servers.front(); |
2189085d | 568 | LOG(prefix<<qname<<": forwarding query to hardcoded nameserver '"<< remoteIP.toStringWithPort()<<"' for zone '"<<authname<<"'"<<endl); |
4957a608 | 569 | |
6148fa97 | 570 | boost::optional<Netmask> nm; |
deca7d8f RG |
571 | bool chained = false; |
572 | res=asyncresolveWrapper(remoteIP, d_doDNSSEC, qname, qtype.getCode(), false, false, &d_now, nm, &lwr, &chained); | |
fabef7e0 | 573 | |
574 | d_totUsec += lwr.d_usec; | |
575 | accountAuthLatency(lwr.d_usec, remoteIP.sin4.sin_family); | |
576 | ||
4957a608 | 577 | // filter out the good stuff from lwr.result() |
ab33a095 RG |
578 | if (res == 1) { |
579 | for(const auto& rec : lwr.d_records) { | |
580 | if(rec.d_place == DNSResourceRecord::ANSWER) | |
581 | ret.push_back(rec); | |
582 | } | |
583 | return 0; | |
584 | } | |
585 | else { | |
586 | return RCode::ServFail; | |
4957a608 | 587 | } |
4957a608 | 588 | } |
115d07ad BH |
589 | } |
590 | } | |
591 | ||
e1636f82 RG |
592 | DNSName authname(qname); |
593 | bool wasForwardedOrAuthZone = false; | |
594 | bool wasAuthZone = false; | |
ad797d94 | 595 | bool wasForwardRecurse = false; |
e1636f82 RG |
596 | domainmap_t::const_iterator iter = getBestAuthZone(&authname); |
597 | if(iter != t_sstorage.domainmap->end()) { | |
ad797d94 | 598 | const auto& domain = iter->second; |
e1636f82 | 599 | wasForwardedOrAuthZone = true; |
ad797d94 RG |
600 | |
601 | if (domain.isAuth()) { | |
e1636f82 | 602 | wasAuthZone = true; |
ad797d94 RG |
603 | } else if (domain.shouldRecurse()) { |
604 | wasForwardRecurse = true; | |
e1636f82 RG |
605 | } |
606 | } | |
607 | ||
ad797d94 | 608 | if(!d_skipCNAMECheck && doCNAMECacheCheck(qname, qtype, ret, depth, res, state, wasAuthZone, wasForwardRecurse)) { // will reroute us if needed |
e1636f82 | 609 | d_wasOutOfBand = wasAuthZone; |
c836dc19 | 610 | return res; |
e1636f82 | 611 | } |
710af846 | 612 | |
ad797d94 | 613 | if(doCacheCheck(qname, authname, wasForwardedOrAuthZone, wasAuthZone, wasForwardRecurse, qtype, ret, depth, res, state)) { |
e1636f82 RG |
614 | // we done |
615 | d_wasOutOfBand = wasAuthZone; | |
c836dc19 | 616 | return res; |
e1636f82 | 617 | } |
c836dc19 | 618 | } |
afbe2787 | 619 | |
115d07ad | 620 | if(d_cacheonly) |
c836dc19 | 621 | return 0; |
728485ca | 622 | |
2189085d | 623 | LOG(prefix<<qname<<": No cache hit for '"<<qname<<"|"<<qtype.getName()<<"', trying to find an appropriate NS record"<<endl); |
710af846 | 624 | |
c5c066bf | 625 | DNSName subdomain(qname); |
d8049162 | 626 | if(qtype == QType::DS) subdomain.chopOff(); |
728485ca | 627 | |
fa1b87ff | 628 | NsSet nsset; |
7305df82 | 629 | bool flawedNSSet=false; |
97df07f8 | 630 | |
3cef03e9 RG |
631 | /* we use subdomain here instead of qname because for DS queries we only care about the state of the parent zone */ |
632 | computeZoneCuts(subdomain, g_rootdnsname, depth); | |
70b3fe7a | 633 | |
97df07f8 PD |
634 | // the two retries allow getBestNSNamesFromCache&co to reprime the root |
635 | // hints, in case they ever go missing | |
bdf40704 | 636 | for(int tries=0;tries<2 && nsset.empty();++tries) { |
891fbf88 | 637 | subdomain=getBestNSNamesFromCache(subdomain, qtype, nsset, &flawedNSSet, depth, beenthere); // pass beenthere to both occasions |
bdf40704 BH |
638 | } |
639 | ||
5374b03b | 640 | state = getValidationStatus(qname, false); |
70b3fe7a | 641 | |
5374b03b | 642 | LOG(prefix<<qname<<": initial validation status for "<<qname<<" is "<<vStates[state]<<endl); |
4d2be65d | 643 | |
51b6b728 | 644 | if(!(res=doResolveAt(nsset, subdomain, flawedNSSet, qname, qtype, ret, depth, beenthere, state))) |
728485ca | 645 | return 0; |
3ddb9247 | 646 | |
2189085d | 647 | LOG(prefix<<qname<<": failed (res="<<res<<")"<<endl); |
b8470add PL |
648 | |
649 | if (res == -2) | |
650 | return res; | |
651 | ||
20177d1d | 652 | return res<0 ? RCode::ServFail : res; |
afbe2787 BH |
653 | } |
654 | ||
c2567ad1 | 655 | #if 0 |
a67dd0cf | 656 | // for testing purposes |
fdf05fd4 BH |
657 | static bool ipv6First(const ComboAddress& a, const ComboAddress& b) |
658 | { | |
659 | return !(a.sin4.sin_family < a.sin4.sin_family); | |
660 | } | |
c2567ad1 | 661 | #endif |
fdf05fd4 | 662 | |
0e4675a9 RG |
663 | struct speedOrderCA |
664 | { | |
665 | speedOrderCA(std::map<ComboAddress,double>& speeds): d_speeds(speeds) {} | |
666 | bool operator()(const ComboAddress& a, const ComboAddress& b) const | |
667 | { | |
668 | return d_speeds[a] < d_speeds[b]; | |
669 | } | |
670 | std::map<ComboAddress, double>& d_speeds; | |
671 | }; | |
672 | ||
21f0f88b | 673 | /** This function explicitly goes out for A or AAAA addresses |
996c89cc | 674 | */ |
b4c8789a | 675 | vector<ComboAddress> SyncRes::getAddrs(const DNSName &qname, unsigned int depth, set<GetBestNSAnswer>& beenthere, bool cacheOnly) |
75b49099 | 676 | { |
e325f20c | 677 | typedef vector<DNSRecord> res_t; |
bfea0d0b | 678 | res_t res; |
75b49099 | 679 | |
996c89cc BH |
680 | typedef vector<ComboAddress> ret_t; |
681 | ret_t ret; | |
75b49099 | 682 | |
d96e88da | 683 | QType type; |
b4c8789a | 684 | bool oldCacheOnly = d_cacheonly; |
24bb9b58 | 685 | bool oldRequireAuthData = d_requireAuthData; |
5597f804 | 686 | bool oldValidationRequested = d_DNSSECValidationRequested; |
24bb9b58 | 687 | d_requireAuthData = false; |
5597f804 | 688 | d_DNSSECValidationRequested = false; |
b4c8789a | 689 | d_cacheonly = cacheOnly; |
92011b8f | 690 | |
691 | for(int j=1; j<2+s_doIPv6; j++) | |
d96e88da | 692 | { |
76c01aec | 693 | bool done=false; |
76c01aec PD |
694 | switch(j) { |
695 | case 0: | |
696 | type = QType::ANY; | |
697 | break; | |
698 | case 1: | |
699 | type = QType::A; | |
700 | break; | |
701 | case 2: | |
702 | type = QType::AAAA; | |
703 | break; | |
704 | } | |
d96e88da | 705 | |
4d2be65d | 706 | vState newState = Indeterminate; |
51b6b728 | 707 | if(!doResolve(qname, type, res,depth+1, beenthere, newState) && !res.empty()) { // this consults cache, OR goes out |
d96e88da | 708 | for(res_t::const_iterator i=res.begin(); i!= res.end(); ++i) { |
e325f20c | 709 | if(i->d_type == QType::A || i->d_type == QType::AAAA) { |
38c2ba02 | 710 | if(auto rec = getRR<ARecordContent>(*i)) |
e325f20c | 711 | ret.push_back(rec->getCA(53)); |
38c2ba02 | 712 | else if(auto aaaarec = getRR<AAAARecordContent>(*i)) |
dd079764 | 713 | ret.push_back(aaaarec->getCA(53)); |
92011b8f | 714 | done=true; |
d96e88da | 715 | } |
42724edf | 716 | } |
f4df5e89 | 717 | } |
710af846 | 718 | if(done) { |
60c9a54f | 719 | if(j==1 && s_doIPv6) { // we got an A record, see if we have some AAAA lying around |
e325f20c | 720 | vector<DNSRecord> cset; |
2fe3354d | 721 | if(t_RC->get(d_now.tv_sec, qname, QType(QType::AAAA), false, &cset, d_cacheRemote) > 0) { |
e325f20c | 722 | for(auto k=cset.cbegin();k!=cset.cend();++k) { |
723 | if(k->d_ttl > (unsigned int)d_now.tv_sec ) { | |
38c2ba02 | 724 | if (auto drc = getRR<AAAARecordContent>(*k)) { |
ba3c54cb RG |
725 | ComboAddress ca=drc->getCA(53); |
726 | ret.push_back(ca); | |
727 | } | |
60c9a54f | 728 | } |
729 | } | |
730 | } | |
731 | } | |
732 | break; | |
733 | } | |
bfea0d0b | 734 | } |
710af846 | 735 | |
24bb9b58 | 736 | d_requireAuthData = oldRequireAuthData; |
5597f804 | 737 | d_DNSSECValidationRequested = oldValidationRequested; |
b4c8789a | 738 | d_cacheonly = oldCacheOnly; |
24bb9b58 | 739 | |
c767798a RG |
740 | /* we need to remove from the nsSpeeds collection the existing IPs |
741 | for this nameserver that are no longer in the set, even if there | |
742 | is only one or none at all in the current set. | |
743 | */ | |
744 | map<ComboAddress, double> speeds; | |
745 | auto& collection = t_sstorage.nsSpeeds[qname].d_collection; | |
746 | for(const auto& val: ret) { | |
7881a640 | 747 | speeds[val] = collection[val].get(&d_now); |
c767798a | 748 | } |
996c89cc | 749 | |
c767798a | 750 | t_sstorage.nsSpeeds[qname].purge(speeds); |
996c89cc | 751 | |
c767798a | 752 | if(ret.size() > 1) { |
0e4675a9 RG |
753 | random_shuffle(ret.begin(), ret.end(), dns_random); |
754 | speedOrderCA so(speeds); | |
755 | stable_sort(ret.begin(), ret.end(), so); | |
756 | ||
757 | if(doLog()) { | |
758 | string prefix=d_prefix; | |
759 | prefix.append(depth, ' '); | |
760 | LOG(prefix<<"Nameserver "<<qname<<" IPs: "); | |
761 | bool first = true; | |
762 | for(const auto& addr : ret) { | |
763 | if (first) { | |
764 | first = false; | |
4957a608 | 765 | } |
0e4675a9 RG |
766 | else { |
767 | LOG(", "); | |
768 | } | |
769 | LOG((addr.toString())<<"(" << (boost::format("%0.2f") % (speeds[addr]/1000.0)).str() <<"ms)"); | |
996c89cc | 770 | } |
0e4675a9 RG |
771 | LOG(endl); |
772 | } | |
996c89cc | 773 | } |
fdf05fd4 | 774 | |
728485ca | 775 | return ret; |
75b49099 BH |
776 | } |
777 | ||
7c3398aa | 778 | void SyncRes::getBestNSFromCache(const DNSName &qname, const QType& qtype, vector<DNSRecord>& bestns, bool* flawedNSSet, unsigned int depth, set<GetBestNSAnswer>& beenthere) |
86c152f2 | 779 | { |
c5c066bf PD |
780 | string prefix; |
781 | DNSName subdomain(qname); | |
77499b05 | 782 | if(doLog()) { |
ded77b10 BH |
783 | prefix=d_prefix; |
784 | prefix.append(depth, ' '); | |
785 | } | |
75b49099 | 786 | bestns.clear(); |
2b1b4054 | 787 | bool brokeloop; |
75b49099 | 788 | do { |
2b1b4054 | 789 | brokeloop=false; |
2189085d | 790 | LOG(prefix<<qname<<": Checking if we have NS in cache for '"<<subdomain<<"'"<<endl); |
e325f20c | 791 | vector<DNSRecord> ns; |
7305df82 | 792 | *flawedNSSet = false; |
4d2be65d | 793 | |
2fe3354d | 794 | if(t_RC->get(d_now.tv_sec, subdomain, QType(QType::NS), false, &ns, d_cacheRemote) > 0) { |
e325f20c | 795 | for(auto k=ns.cbegin();k!=ns.cend(); ++k) { |
796 | if(k->d_ttl > (unsigned int)d_now.tv_sec ) { | |
797 | vector<DNSRecord> aset; | |
4957a608 | 798 | |
e325f20c | 799 | const DNSRecord& dr=*k; |
ba3c54cb RG |
800 | auto nrr = getRR<NSRecordContent>(dr); |
801 | if(nrr && (!nrr->getNS().isPartOf(subdomain) || t_RC->get(d_now.tv_sec, nrr->getNS(), s_doIPv6 ? QType(QType::ADDR) : QType(QType::A), | |
2fe3354d | 802 | false, doLog() ? &aset : 0, d_cacheRemote) > 5)) { |
e325f20c | 803 | bestns.push_back(dr); |
2189085d PL |
804 | LOG(prefix<<qname<<": NS (with ip, or non-glue) in cache for '"<<subdomain<<"' -> '"<<nrr->getNS()<<"'"<<endl); |
805 | LOG(prefix<<qname<<": within bailiwick: "<< nrr->getNS().isPartOf(subdomain)); | |
4957a608 | 806 | if(!aset.empty()) { |
e325f20c | 807 | LOG(", in cache, ttl="<<(unsigned int)(((time_t)aset.begin()->d_ttl- d_now.tv_sec ))<<endl); |
4957a608 BH |
808 | } |
809 | else { | |
77499b05 | 810 | LOG(", not in cache / did not look at cache"<<endl); |
4957a608 BH |
811 | } |
812 | } | |
813 | else { | |
814 | *flawedNSSet=true; | |
e325f20c | 815 | LOG(prefix<<qname<<": NS in cache for '"<<subdomain<<"', but needs glue ("<<nrr->getNS()<<") which we miss or is expired"<<endl); |
4957a608 BH |
816 | } |
817 | } | |
afbe2787 | 818 | } |
4d2be65d | 819 | |
75b49099 | 820 | if(!bestns.empty()) { |
4957a608 | 821 | GetBestNSAnswer answer; |
891fbf88 | 822 | answer.qname=qname; |
823 | answer.qtype=qtype.getCode(); | |
38c2ba02 RG |
824 | for(const auto& dr : bestns) { |
825 | if (auto nsContent = getRR<NSRecordContent>(dr)) { | |
826 | answer.bestns.insert(make_pair(dr.d_name, nsContent->getNS())); | |
827 | } | |
828 | } | |
891fbf88 | 829 | |
4957a608 | 830 | if(beenthere.count(answer)) { |
2b1b4054 | 831 | brokeloop=true; |
2189085d | 832 | LOG(prefix<<qname<<": We have NS in cache for '"<<subdomain<<"' but part of LOOP (already seen "<<answer.qname<<")! Trying less specific NS"<<endl); |
e325f20c | 833 | ; |
77499b05 BH |
834 | if(doLog()) |
835 | for( set<GetBestNSAnswer>::const_iterator j=beenthere.begin();j!=beenthere.end();++j) { | |
2b1b4054 | 836 | bool neo = !(*j< answer || answer<*j); |
2189085d | 837 | LOG(prefix<<qname<<": beenthere"<<(neo?"*":"")<<": "<<j->qname<<"|"<<DNSRecordContent::NumberToType(j->qtype)<<" ("<<(unsigned int)j->bestns.size()<<")"<<endl); |
77499b05 | 838 | } |
4957a608 BH |
839 | bestns.clear(); |
840 | } | |
841 | else { | |
6576051d | 842 | beenthere.insert(answer); |
2189085d | 843 | LOG(prefix<<qname<<": We have NS in cache for '"<<subdomain<<"' (flawedNSSet="<<*flawedNSSet<<")"<<endl); |
4957a608 BH |
844 | return; |
845 | } | |
75b49099 | 846 | } |
afbe2787 | 847 | } |
2189085d | 848 | LOG(prefix<<qname<<": no valid/useful NS in cache for '"<<subdomain<<"'"<<endl); |
4d2be65d | 849 | |
52683ca3 | 850 | if(subdomain.isRoot() && !brokeloop) { |
7836f7b4 | 851 | // We lost the root NS records |
3ddb9247 | 852 | primeHints(); |
2189085d | 853 | LOG(prefix<<qname<<": reprimed the root"<<endl); |
0b29b9c5 RG |
854 | /* let's prevent an infinite loop */ |
855 | if (!d_updatingRootNS) { | |
856 | getRootNS(d_now, d_asyncResolve); | |
857 | } | |
6576051d | 858 | } |
4d2be65d | 859 | } while(subdomain.chopOff()); |
75b49099 BH |
860 | } |
861 | ||
69cbdef9 | 862 | SyncRes::domainmap_t::const_iterator SyncRes::getBestAuthZone(DNSName* qname) const |
5605c067 BH |
863 | { |
864 | SyncRes::domainmap_t::const_iterator ret; | |
865 | do { | |
a712cb56 RG |
866 | ret=t_sstorage.domainmap->find(*qname); |
867 | if(ret!=t_sstorage.domainmap->end()) | |
5605c067 | 868 | break; |
c5c066bf | 869 | }while(qname->chopOff()); |
5605c067 BH |
870 | return ret; |
871 | } | |
288f4aa9 | 872 | |
7bf26383 | 873 | /** doesn't actually do the work, leaves that to getBestNSFromCache */ |
7c3398aa | 874 | DNSName SyncRes::getBestNSNamesFromCache(const DNSName &qname, const QType& qtype, NsSet& nsset, bool* flawedNSSet, unsigned int depth, set<GetBestNSAnswer>&beenthere) |
75b49099 | 875 | { |
c5c066bf PD |
876 | DNSName subdomain(qname); |
877 | DNSName authdomain(qname); | |
3ddb9247 | 878 | |
5605c067 | 879 | domainmap_t::const_iterator iter=getBestAuthZone(&authdomain); |
a712cb56 | 880 | if(iter!=t_sstorage.domainmap->end()) { |
3337c2f7 | 881 | if( iter->second.isAuth() ) |
fa1b87ff PL |
882 | // this gets picked up in doResolveAt, the empty DNSName, combined with the |
883 | // empty vector means 'we are auth for this zone' | |
884 | nsset.insert({DNSName(), {{}, false}}); | |
2e5ae2b2 | 885 | else { |
fa1b87ff PL |
886 | // Again, picked up in doResolveAt. An empty DNSName, combined with a |
887 | // non-empty vector of ComboAddresses means 'this is a forwarded domain' | |
6dfff36f | 888 | // This is actually picked up in retrieveAddressesForNS called from doResolveAt. |
3337c2f7 | 889 | nsset.insert({DNSName(), {iter->second.d_servers, iter->second.shouldRecurse() }}); |
2e5ae2b2 | 890 | } |
5605c067 BH |
891 | return authdomain; |
892 | } | |
893 | ||
e325f20c | 894 | vector<DNSRecord> bestns; |
891fbf88 | 895 | getBestNSFromCache(subdomain, qtype, bestns, flawedNSSet, depth, beenthere); |
75b49099 | 896 | |
e325f20c | 897 | for(auto k=bestns.cbegin() ; k != bestns.cend(); ++k) { |
fa1b87ff | 898 | // The actual resolver code will not even look at the ComboAddress or bool |
38c2ba02 RG |
899 | const auto nsContent = getRR<NSRecordContent>(*k); |
900 | if (nsContent) { | |
901 | nsset.insert({nsContent->getNS(), {{}, false}}); | |
902 | if(k==bestns.cbegin()) | |
903 | subdomain=k->d_name; | |
904 | } | |
86c152f2 | 905 | } |
75b49099 | 906 | return subdomain; |
afbe2787 BH |
907 | } |
908 | ||
ad797d94 | 909 | bool SyncRes::doCNAMECacheCheck(const DNSName &qname, const QType &qtype, vector<DNSRecord>& ret, unsigned int depth, int &res, vState& state, bool wasAuthZone, bool wasForwardRecurse) |
afbe2787 | 910 | { |
ded77b10 | 911 | string prefix; |
77499b05 | 912 | if(doLog()) { |
710af846 | 913 | prefix=d_prefix; |
ded77b10 BH |
914 | prefix.append(depth, ' '); |
915 | } | |
36f5e3db | 916 | |
40de2910 | 917 | if((depth>9 && d_outqueries>10 && d_throttledqueries>5) || depth > 15) { |
2189085d | 918 | LOG(prefix<<qname<<": recursing (CNAME or other indirection) too deep, depth="<<depth<<endl); |
c6644fc5 BH |
919 | res=RCode::ServFail; |
920 | return true; | |
921 | } | |
3ddb9247 | 922 | |
2189085d | 923 | LOG(prefix<<qname<<": Looking for CNAME cache hit of '"<<qname<<"|CNAME"<<"'"<<endl); |
e325f20c | 924 | vector<DNSRecord> cset; |
1f77f479 | 925 | vector<std::shared_ptr<RRSIGRecordContent>> signatures; |
2b984251 | 926 | vector<std::shared_ptr<DNSRecord>> authorityRecs; |
428f41b7 | 927 | bool wasAuth; |
ad797d94 RG |
928 | /* we don't require auth data for forward-recurse lookups */ |
929 | if(t_RC->get(d_now.tv_sec, qname, QType(QType::CNAME), !wasForwardRecurse && d_requireAuthData, &cset, d_cacheRemote, d_doDNSSEC ? &signatures : nullptr, d_doDNSSEC ? &authorityRecs : nullptr, &d_wasVariable, &state, &wasAuth) > 0) { | |
36c5ee42 | 930 | |
e325f20c | 931 | for(auto j=cset.cbegin() ; j != cset.cend() ; ++j) { |
c5310862 RG |
932 | if (j->d_class != QClass::IN) { |
933 | continue; | |
934 | } | |
935 | ||
e325f20c | 936 | if(j->d_ttl>(unsigned int) d_now.tv_sec) { |
428f41b7 | 937 | |
e1636f82 | 938 | if (!wasAuthZone && shouldValidate() && wasAuth && state == Indeterminate && d_requireAuthData) { |
428f41b7 RG |
939 | /* This means we couldn't figure out the state when this entry was cached, |
940 | most likely because we hadn't computed the zone cuts yet. */ | |
aa30ad7e | 941 | /* make sure they are computed before validating */ |
f4de85a3 RG |
942 | DNSName subdomain(qname); |
943 | /* if we are retrieving a DS, we only care about the state of the parent zone */ | |
944 | if(qtype == QType::DS) | |
945 | subdomain.chopOff(); | |
946 | ||
947 | computeZoneCuts(subdomain, g_rootdnsname, depth); | |
aa30ad7e | 948 | |
142ab370 | 949 | vState recordState = getValidationStatus(qname, false); |
787737ae RG |
950 | if (recordState == Secure) { |
951 | LOG(prefix<<qname<<": got Indeterminate state from the CNAME cache, validating.."<<endl); | |
952 | state = SyncRes::validateRecordsWithSigs(depth, qname, QType(QType::CNAME), qname, cset, signatures); | |
953 | if (state != Indeterminate) { | |
954 | LOG(prefix<<qname<<": got Indeterminate state from the CNAME cache, new validation result is "<<vStates[state]<<endl); | |
2fe3354d | 955 | t_RC->updateValidationStatus(d_now.tv_sec, qname, QType(QType::CNAME), d_cacheRemote, d_requireAuthData, state); |
787737ae RG |
956 | } |
957 | } | |
428f41b7 RG |
958 | } |
959 | ||
4d2be65d | 960 | LOG(prefix<<qname<<": Found cache CNAME hit for '"<< qname << "|CNAME" <<"' to '"<<j->d_content->getZoneRepresentation()<<"', validation state is "<<vStates[state]<<endl); |
428f41b7 | 961 | |
e325f20c | 962 | DNSRecord dr=*j; |
963 | dr.d_ttl-=d_now.tv_sec; | |
f128d20d | 964 | ret.reserve(ret.size() + 1 + signatures.size() + authorityRecs.size()); |
e325f20c | 965 | ret.push_back(dr); |
1f77f479 | 966 | |
4d2be65d RG |
967 | for(const auto& signature : signatures) { |
968 | DNSRecord sigdr; | |
969 | sigdr.d_type=QType::RRSIG; | |
970 | sigdr.d_name=qname; | |
971 | sigdr.d_ttl=j->d_ttl - d_now.tv_sec; | |
972 | sigdr.d_content=signature; | |
973 | sigdr.d_place=DNSResourceRecord::ANSWER; | |
974 | sigdr.d_class=QClass::IN; | |
975 | ret.push_back(sigdr); | |
976 | } | |
1f77f479 | 977 | |
2b984251 | 978 | for(const auto& rec : authorityRecs) { |
2010ac95 RG |
979 | DNSRecord authDR(*rec); |
980 | authDR.d_ttl=j->d_ttl - d_now.tv_sec; | |
981 | ret.push_back(authDR); | |
2b984251 RG |
982 | } |
983 | ||
f8e7daf8 | 984 | if(qtype != QType::CNAME) { // perhaps they really wanted a CNAME! |
4957a608 | 985 | set<GetBestNSAnswer>beenthere; |
4d2be65d RG |
986 | |
987 | vState cnameState = Indeterminate; | |
38c2ba02 RG |
988 | const auto cnameContent = getRR<CNAMERecordContent>(*j); |
989 | if (cnameContent) { | |
990 | res=doResolve(cnameContent->getTarget(), qtype, ret, depth+1, beenthere, cnameState); | |
991 | LOG(prefix<<qname<<": updating validation state for response to "<<qname<<" from "<<vStates[state]<<" with the state from the CNAME quest: "<<vStates[cnameState]<<endl); | |
992 | updateValidationState(state, cnameState); | |
993 | } | |
4957a608 BH |
994 | } |
995 | else | |
996 | res=0; | |
4d2be65d | 997 | |
4957a608 | 998 | return true; |
ac539791 BH |
999 | } |
1000 | } | |
afbe2787 | 1001 | } |
2189085d | 1002 | LOG(prefix<<qname<<": No CNAME cache hit of '"<< qname << "|CNAME" <<"' found"<<endl); |
75b49099 BH |
1003 | return false; |
1004 | } | |
1005 | ||
f984e703 | 1006 | namespace { |
142ab370 RG |
1007 | struct CacheEntry |
1008 | { | |
1009 | vector<DNSRecord> records; | |
1010 | vector<shared_ptr<RRSIGRecordContent>> signatures; | |
1011 | uint32_t signaturesTTL{std::numeric_limits<uint32_t>::max()}; | |
1012 | }; | |
1013 | struct CacheKey | |
1014 | { | |
1015 | DNSName name; | |
1016 | uint16_t type; | |
1017 | DNSResourceRecord::Place place; | |
1018 | bool operator<(const CacheKey& rhs) const { | |
129e658f | 1019 | return tie(name, type, place) < tie(rhs.name, rhs.type, rhs.place); |
142ab370 RG |
1020 | } |
1021 | }; | |
1022 | typedef map<CacheKey, CacheEntry> tcache_t; | |
f984e703 | 1023 | } |
142ab370 RG |
1024 | |
1025 | static void reapRecordsFromNegCacheEntryForValidation(tcache_t& tcache, const vector<DNSRecord>& records) | |
1026 | { | |
1027 | for (const auto& rec : records) { | |
1028 | if (rec.d_type == QType::RRSIG) { | |
1029 | auto rrsig = getRR<RRSIGRecordContent>(rec); | |
1030 | if (rrsig) { | |
1031 | tcache[{rec.d_name, rrsig->d_type, rec.d_place}].signatures.push_back(rrsig); | |
1032 | } | |
1033 | } else { | |
1034 | tcache[{rec.d_name,rec.d_type,rec.d_place}].records.push_back(rec); | |
1035 | } | |
1036 | } | |
1037 | } | |
1038 | ||
6909b8c5 PL |
1039 | /*! |
1040 | * Convience function to push the records from records into ret with a new TTL | |
1041 | * | |
1042 | * \param records DNSRecords that need to go into ret | |
1043 | * \param ttl The new TTL for these records | |
1044 | * \param ret The vector of DNSRecords that should contian the records with the modified TTL | |
1045 | */ | |
1046 | static void addTTLModifiedRecords(const vector<DNSRecord>& records, const uint32_t ttl, vector<DNSRecord>& ret) { | |
39ce10b2 PL |
1047 | for (const auto& rec : records) { |
1048 | DNSRecord r(rec); | |
1049 | r.d_ttl = ttl; | |
1050 | ret.push_back(r); | |
1051 | } | |
1052 | } | |
1053 | ||
28364e4b | 1054 | void SyncRes::computeNegCacheValidationStatus(const NegCache::NegCacheEntry* ne, const DNSName& qname, const QType& qtype, const int res, vState& state, unsigned int depth) |
142ab370 | 1055 | { |
f4de85a3 RG |
1056 | DNSName subdomain(qname); |
1057 | /* if we are retrieving a DS, we only care about the state of the parent zone */ | |
1058 | if(qtype == QType::DS) | |
1059 | subdomain.chopOff(); | |
1060 | ||
1061 | computeZoneCuts(subdomain, g_rootdnsname, depth); | |
142ab370 RG |
1062 | |
1063 | tcache_t tcache; | |
28364e4b RG |
1064 | reapRecordsFromNegCacheEntryForValidation(tcache, ne->authoritySOA.records); |
1065 | reapRecordsFromNegCacheEntryForValidation(tcache, ne->authoritySOA.signatures); | |
1066 | reapRecordsFromNegCacheEntryForValidation(tcache, ne->DNSSECRecords.records); | |
1067 | reapRecordsFromNegCacheEntryForValidation(tcache, ne->DNSSECRecords.signatures); | |
142ab370 RG |
1068 | |
1069 | for (const auto& entry : tcache) { | |
1070 | // this happens when we did store signatures, but passed on the records themselves | |
1071 | if (entry.second.records.empty()) { | |
1072 | continue; | |
1073 | } | |
1074 | ||
1075 | const DNSName& owner = entry.first.name; | |
1076 | ||
1077 | vState recordState = getValidationStatus(owner, false); | |
1078 | if (state == Indeterminate) { | |
1079 | state = recordState; | |
1080 | } | |
1081 | ||
1082 | if (recordState == Secure) { | |
f4de85a3 RG |
1083 | recordState = SyncRes::validateRecordsWithSigs(depth, qname, qtype, owner, entry.second.records, entry.second.signatures); |
1084 | } | |
142ab370 | 1085 | |
f4de85a3 RG |
1086 | if (recordState != Indeterminate && recordState != state) { |
1087 | updateValidationState(state, recordState); | |
1088 | if (state != Secure) { | |
1089 | break; | |
142ab370 RG |
1090 | } |
1091 | } | |
1092 | } | |
1093 | ||
1094 | if (state == Secure) { | |
28364e4b | 1095 | vState neValidationState = ne->d_validationState; |
142ab370 | 1096 | dState expectedState = res == RCode::NXDomain ? NXDOMAIN : NXQTYPE; |
28364e4b RG |
1097 | dState denialState = getDenialValidationState(*ne, state, expectedState, false); |
1098 | updateDenialValidationState(neValidationState, ne->d_name, state, denialState, expectedState, qtype == QType::DS); | |
142ab370 RG |
1099 | } |
1100 | if (state != Indeterminate) { | |
1101 | /* validation succeeded, let's update the cache entry so we don't have to validate again */ | |
28364e4b | 1102 | t_sstorage.negcache.updateValidationStatus(ne->d_name, ne->d_qtype, state); |
142ab370 RG |
1103 | } |
1104 | } | |
e325f20c | 1105 | |
ad797d94 | 1106 | bool SyncRes::doCacheCheck(const DNSName &qname, const DNSName& authname, bool wasForwardedOrAuthZone, bool wasAuthZone, bool wasForwardRecurse, const QType &qtype, vector<DNSRecord>&ret, unsigned int depth, int &res, vState& state) |
75b49099 | 1107 | { |
fd8bc993 | 1108 | bool giveNegative=false; |
710af846 | 1109 | |
be718669 | 1110 | string prefix; |
77499b05 | 1111 | if(doLog()) { |
ded77b10 BH |
1112 | prefix=d_prefix; |
1113 | prefix.append(depth, ' '); | |
1114 | } | |
afbe2787 | 1115 | |
30e9bd93 | 1116 | // 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 | 1117 | DNSName sqname(qname); |
288f4aa9 | 1118 | QType sqt(qtype); |
092f210a | 1119 | uint32_t sttl=0; |
2189085d | 1120 | // cout<<"Lookup for '"<<qname<<"|"<<qtype.getName()<<"' -> "<<getLastLabel(qname)<<endl; |
4d2be65d | 1121 | vState cachedState; |
28364e4b | 1122 | const NegCache::NegCacheEntry* ne = nullptr; |
64a8b6a1 | 1123 | |
710af846 | 1124 | if(s_rootNXTrust && |
28364e4b RG |
1125 | t_sstorage.negcache.getRootNXTrust(qname, d_now, &ne) && |
1126 | ne->d_auth.isRoot() && | |
e1636f82 | 1127 | !(wasForwardedOrAuthZone && !authname.isRoot())) { // when forwarding, the root may only neg-cache if it was forwarded to. |
28364e4b RG |
1128 | sttl = ne->d_ttd - d_now.tv_sec; |
1129 | LOG(prefix<<qname<<": Entire name '"<<qname<<"', is negatively cached via '"<<ne->d_auth<<"' & '"<<ne->d_name<<"' for another "<<sttl<<" seconds"<<endl); | |
3ddb9247 | 1130 | res = RCode::NXDomain; |
39ce10b2 | 1131 | giveNegative = true; |
28364e4b | 1132 | cachedState = ne->d_validationState; |
01402d56 | 1133 | } |
28364e4b RG |
1134 | else if (t_sstorage.negcache.get(qname, qtype, d_now, &ne) && |
1135 | !(wasForwardedOrAuthZone && ne->d_auth != authname)) { // Only the authname nameserver can neg cache entries | |
b0c164a2 RG |
1136 | |
1137 | /* If we are looking for a DS, discard NXD if auth == qname | |
1138 | and ask for a specific denial instead */ | |
28364e4b RG |
1139 | if (qtype != QType::DS || ne->d_qtype.getCode() || ne->d_auth != qname || |
1140 | t_sstorage.negcache.get(qname, qtype, d_now, &ne, true)) | |
b0c164a2 RG |
1141 | { |
1142 | res = 0; | |
28364e4b | 1143 | sttl = ne->d_ttd - d_now.tv_sec; |
b0c164a2 | 1144 | giveNegative = true; |
28364e4b RG |
1145 | cachedState = ne->d_validationState; |
1146 | if(ne->d_qtype.getCode()) { | |
1147 | LOG(prefix<<qname<<": "<<qtype.getName()<<" is negatively cached via '"<<ne->d_auth<<"' for another "<<sttl<<" seconds"<<endl); | |
b0c164a2 RG |
1148 | res = RCode::NoError; |
1149 | } | |
1150 | else { | |
28364e4b | 1151 | LOG(prefix<<qname<<": Entire name '"<<qname<<"', is negatively cached via '"<<ne->d_auth<<"' for another "<<sttl<<" seconds"<<endl); |
b0c164a2 RG |
1152 | res = RCode::NXDomain; |
1153 | } | |
39ce10b2 | 1154 | } |
39ce10b2 PL |
1155 | } |
1156 | ||
1157 | if (giveNegative) { | |
142ab370 RG |
1158 | |
1159 | state = cachedState; | |
1160 | ||
e1636f82 | 1161 | if (!wasAuthZone && shouldValidate() && state == Indeterminate) { |
142ab370 RG |
1162 | LOG(prefix<<qname<<": got Indeterminate state for records retrieved from the negative cache, validating.."<<endl); |
1163 | computeNegCacheValidationStatus(ne, qname, qtype, res, state, depth); | |
1164 | } | |
1165 | ||
39ce10b2 | 1166 | // Transplant SOA to the returned packet |
28364e4b | 1167 | addTTLModifiedRecords(ne->authoritySOA.records, sttl, ret); |
4d00b38b | 1168 | if(d_doDNSSEC) { |
28364e4b RG |
1169 | addTTLModifiedRecords(ne->authoritySOA.signatures, sttl, ret); |
1170 | addTTLModifiedRecords(ne->DNSSECRecords.records, sttl, ret); | |
1171 | addTTLModifiedRecords(ne->DNSSECRecords.signatures, sttl, ret); | |
4d00b38b | 1172 | } |
4d2be65d | 1173 | |
142ab370 | 1174 | LOG(prefix<<qname<<": updating validation state with negative cache content for "<<qname<<" to "<<vStates[state]<<endl); |
39ce10b2 | 1175 | return true; |
fd8bc993 | 1176 | } |
39ce10b2 | 1177 | |
e325f20c | 1178 | vector<DNSRecord> cset; |
75b49099 | 1179 | bool found=false, expired=false; |
57769f13 | 1180 | vector<std::shared_ptr<RRSIGRecordContent>> signatures; |
2b984251 | 1181 | vector<std::shared_ptr<DNSRecord>> authorityRecs; |
57769f13 | 1182 | uint32_t ttl=0; |
428f41b7 | 1183 | bool wasCachedAuth; |
ad797d94 | 1184 | if(t_RC->get(d_now.tv_sec, sqname, sqt, !wasForwardRecurse && d_requireAuthData, &cset, d_cacheRemote, d_doDNSSEC ? &signatures : nullptr, d_doDNSSEC ? &authorityRecs : nullptr, &d_wasVariable, &cachedState, &wasCachedAuth) > 0) { |
428f41b7 | 1185 | |
2189085d | 1186 | LOG(prefix<<sqname<<": Found cache hit for "<<sqt.getName()<<": "); |
428f41b7 | 1187 | |
e1636f82 | 1188 | if (!wasAuthZone && shouldValidate() && wasCachedAuth && cachedState == Indeterminate && d_requireAuthData) { |
428f41b7 RG |
1189 | |
1190 | /* This means we couldn't figure out the state when this entry was cached, | |
1191 | most likely because we hadn't computed the zone cuts yet. */ | |
aa30ad7e | 1192 | /* make sure they are computed before validating */ |
f4de85a3 RG |
1193 | DNSName subdomain(sqname); |
1194 | /* if we are retrieving a DS, we only care about the state of the parent zone */ | |
1195 | if(qtype == QType::DS) | |
1196 | subdomain.chopOff(); | |
1197 | ||
1198 | computeZoneCuts(subdomain, g_rootdnsname, depth); | |
aa30ad7e | 1199 | |
142ab370 | 1200 | vState recordState = getValidationStatus(qname, false); |
787737ae RG |
1201 | if (recordState == Secure) { |
1202 | LOG(prefix<<sqname<<": got Indeterminate state from the cache, validating.."<<endl); | |
1203 | cachedState = SyncRes::validateRecordsWithSigs(depth, sqname, sqt, sqname, cset, signatures); | |
f4de85a3 RG |
1204 | } |
1205 | else { | |
1206 | cachedState = recordState; | |
1207 | } | |
787737ae | 1208 | |
f4de85a3 RG |
1209 | if (cachedState != Indeterminate) { |
1210 | LOG(prefix<<qname<<": got Indeterminate state from the cache, validation result is "<<vStates[cachedState]<<endl); | |
2fe3354d | 1211 | t_RC->updateValidationStatus(d_now.tv_sec, sqname, sqt, d_cacheRemote, d_requireAuthData, cachedState); |
787737ae | 1212 | } |
428f41b7 RG |
1213 | } |
1214 | ||
e325f20c | 1215 | for(auto j=cset.cbegin() ; j != cset.cend() ; ++j) { |
c5310862 | 1216 | |
e325f20c | 1217 | LOG(j->d_content->getZoneRepresentation()); |
c5310862 RG |
1218 | |
1219 | if (j->d_class != QClass::IN) { | |
1220 | continue; | |
1221 | } | |
1222 | ||
e325f20c | 1223 | if(j->d_ttl>(unsigned int) d_now.tv_sec) { |
1224 | DNSRecord dr=*j; | |
1225 | ttl = (dr.d_ttl-=d_now.tv_sec); | |
e325f20c | 1226 | ret.push_back(dr); |
1227 | LOG("[ttl="<<dr.d_ttl<<"] "); | |
4957a608 | 1228 | found=true; |
ac539791 | 1229 | } |
75b49099 | 1230 | else { |
77499b05 | 1231 | LOG("[expired] "); |
4957a608 | 1232 | expired=true; |
75b49099 | 1233 | } |
afbe2787 | 1234 | } |
57769f13 | 1235 | |
f128d20d RG |
1236 | ret.reserve(ret.size() + signatures.size() + authorityRecs.size()); |
1237 | ||
57769f13 | 1238 | for(const auto& signature : signatures) { |
e325f20c | 1239 | DNSRecord dr; |
1240 | dr.d_type=QType::RRSIG; | |
1241 | dr.d_name=sqname; | |
1242 | dr.d_ttl=ttl; | |
1243 | dr.d_content=signature; | |
39ce10b2 | 1244 | dr.d_place = DNSResourceRecord::ANSWER; |
4d2be65d | 1245 | dr.d_class=QClass::IN; |
e325f20c | 1246 | ret.push_back(dr); |
57769f13 | 1247 | } |
2b984251 RG |
1248 | |
1249 | for(const auto& rec : authorityRecs) { | |
1250 | DNSRecord dr(*rec); | |
1251 | dr.d_ttl=ttl; | |
1252 | ret.push_back(dr); | |
1253 | } | |
1254 | ||
77499b05 | 1255 | LOG(endl); |
f4df5e89 | 1256 | if(found && !expired) { |
4d2be65d | 1257 | if (!giveNegative) |
4957a608 | 1258 | res=0; |
bcb05770 | 1259 | LOG(prefix<<qname<<": updating validation state with cache content for "<<qname<<" to "<<vStates[cachedState]<<endl); |
4d2be65d | 1260 | state = cachedState; |
75b49099 | 1261 | return true; |
f4df5e89 | 1262 | } |
75b49099 | 1263 | else |
2189085d | 1264 | LOG(prefix<<qname<<": cache had only stale entries"<<endl); |
afbe2787 | 1265 | } |
f4df5e89 | 1266 | |
75b49099 BH |
1267 | return false; |
1268 | } | |
afbe2787 | 1269 | |
69cbdef9 | 1270 | bool SyncRes::moreSpecificThan(const DNSName& a, const DNSName &b) const |
75b49099 | 1271 | { |
6a1010f7 | 1272 | return (a.isPartOf(b) && a.countLabels() > b.countLabels()); |
afbe2787 BH |
1273 | } |
1274 | ||
d8d0bb8f | 1275 | struct speedOrder |
eefd15f9 | 1276 | { |
3ddb9247 PD |
1277 | speedOrder(map<DNSName,double> &speeds) : d_speeds(speeds) {} |
1278 | bool operator()(const DNSName &a, const DNSName &b) const | |
c3d9d009 BH |
1279 | { |
1280 | return d_speeds[a] < d_speeds[b]; | |
c3d9d009 | 1281 | } |
3ddb9247 | 1282 | map<DNSName, double>& d_speeds; |
c3d9d009 BH |
1283 | }; |
1284 | ||
fa1b87ff | 1285 | inline vector<DNSName> SyncRes::shuffleInSpeedOrder(NsSet &tnameservers, const string &prefix) |
afbe2787 | 1286 | { |
e8b23f3b | 1287 | vector<DNSName> rnameservers; |
5ea6f7de | 1288 | rnameservers.reserve(tnameservers.size()); |
a2d65f83 | 1289 | for(const auto& tns: tnameservers) { |
88490c03 | 1290 | rnameservers.push_back(tns.first); |
a2d65f83 | 1291 | if(tns.first.empty()) // this was an authoritative OOB zone, don't pollute the nsSpeeds with that |
1292 | return rnameservers; | |
21f0f88b | 1293 | } |
e8b23f3b | 1294 | map<DNSName, double> speeds; |
461df9d2 | 1295 | |
e8b23f3b | 1296 | for(const auto& val: rnameservers) { |
79b8cdcc | 1297 | double speed; |
a712cb56 | 1298 | speed=t_sstorage.nsSpeeds[val].get(&d_now); |
21f0f88b | 1299 | speeds[val]=speed; |
eefd15f9 | 1300 | } |
51e2144e | 1301 | random_shuffle(rnameservers.begin(),rnameservers.end(), dns_random); |
996c89cc BH |
1302 | speedOrder so(speeds); |
1303 | stable_sort(rnameservers.begin(),rnameservers.end(), so); | |
710af846 | 1304 | |
77499b05 BH |
1305 | if(doLog()) { |
1306 | LOG(prefix<<"Nameservers: "); | |
e325f20c | 1307 | for(vector<DNSName>::const_iterator i=rnameservers.begin();i!=rnameservers.end();++i) { |
3ddb9247 | 1308 | if(i!=rnameservers.begin()) { |
77499b05 BH |
1309 | LOG(", "); |
1310 | if(!((i-rnameservers.begin())%3)) { | |
1311 | LOG(endl<<prefix<<" "); | |
1312 | } | |
d8d0bb8f | 1313 | } |
317f7521 | 1314 | LOG(i->toLogString()<<"(" << (boost::format("%0.2f") % (speeds[*i]/1000.0)).str() <<"ms)"); |
d8d0bb8f | 1315 | } |
77499b05 | 1316 | LOG(endl); |
d8d0bb8f | 1317 | } |
728485ca | 1318 | return rnameservers; |
afbe2787 BH |
1319 | } |
1320 | ||
cc11d7f4 | 1321 | inline vector<ComboAddress> SyncRes::shuffleForwardSpeed(const vector<ComboAddress> &rnameservers, const string &prefix, const bool wasRd) |
589884b8 | 1322 | { |
cc11d7f4 | 1323 | vector<ComboAddress> nameservers = rnameservers; |
6ed0c28a | 1324 | map<ComboAddress, double> speeds; |
589884b8 | 1325 | |
cc11d7f4 | 1326 | for(const auto& val: nameservers) { |
589884b8 | 1327 | double speed; |
6ed0c28a | 1328 | DNSName nsName = DNSName(val.toStringWithPort()); |
1329 | speed=t_sstorage.nsSpeeds[nsName].get(&d_now); | |
589884b8 | 1330 | speeds[val]=speed; |
1331 | } | |
cc11d7f4 | 1332 | random_shuffle(nameservers.begin(),nameservers.end(), dns_random); |
6ed0c28a | 1333 | speedOrderCA so(speeds); |
cc11d7f4 | 1334 | stable_sort(nameservers.begin(),nameservers.end(), so); |
589884b8 | 1335 | |
589884b8 | 1336 | if(doLog()) { |
1337 | LOG(prefix<<"Nameservers: "); | |
cc11d7f4 | 1338 | for(vector<ComboAddress>::const_iterator i=nameservers.cbegin();i!=nameservers.cend();++i) { |
1339 | if(i!=nameservers.cbegin()) { | |
589884b8 | 1340 | LOG(", "); |
cc11d7f4 | 1341 | if(!((i-nameservers.cbegin())%3)) { |
589884b8 | 1342 | LOG(endl<<prefix<<" "); |
1343 | } | |
1344 | } | |
6ed0c28a | 1345 | LOG((wasRd ? string("+") : string("-")) << i->toStringWithPort() <<"(" << (boost::format("%0.2f") % (speeds[*i]/1000.0)).str() <<"ms)"); |
589884b8 | 1346 | } |
1347 | LOG(endl); | |
1348 | } | |
cc11d7f4 | 1349 | return nameservers; |
589884b8 | 1350 | } |
1351 | ||
dbbef467 RG |
1352 | static uint32_t getRRSIGTTL(const time_t now, const std::shared_ptr<RRSIGRecordContent>& rrsig) |
1353 | { | |
1354 | uint32_t res = 0; | |
1355 | if (now < rrsig->d_sigexpire) { | |
1356 | res = static_cast<uint32_t>(rrsig->d_sigexpire) - now; | |
1357 | } | |
1358 | return res; | |
1359 | } | |
1360 | ||
2b984251 RG |
1361 | static const set<uint16_t> nsecTypes = {QType::NSEC, QType::NSEC3}; |
1362 | ||
39ce10b2 PL |
1363 | /* Fills the authoritySOA and DNSSECRecords fields from ne with those found in the records |
1364 | * | |
1365 | * \param records The records to parse for the authority SOA and NSEC(3) records | |
1366 | * \param ne The NegCacheEntry to be filled out (will not be cleared, only appended to | |
1367 | */ | |
dbbef467 | 1368 | static void harvestNXRecords(const vector<DNSRecord>& records, NegCache::NegCacheEntry& ne, const time_t now, uint32_t* lowestTTL) { |
620db2c8 | 1369 | for(const auto& rec : records) { |
39ce10b2 PL |
1370 | if(rec.d_place != DNSResourceRecord::AUTHORITY) |
1371 | // RFC 4035 section 3.1.3. indicates that NSEC records MUST be placed in | |
1372 | // the AUTHORITY section. Section 3.1.1 indicates that that RRSIGs for | |
1373 | // records MUST be in the same section as the records they cover. | |
1374 | // Hence, we ignore all records outside of the AUTHORITY section. | |
1375 | continue; | |
1376 | ||
620db2c8 | 1377 | if(rec.d_type == QType::RRSIG) { |
39ce10b2 PL |
1378 | auto rrsig = getRR<RRSIGRecordContent>(rec); |
1379 | if(rrsig) { | |
1380 | if(rrsig->d_type == QType::SOA) { | |
1381 | ne.authoritySOA.signatures.push_back(rec); | |
dbbef467 RG |
1382 | if (lowestTTL && isRRSIGNotExpired(now, rrsig)) { |
1383 | *lowestTTL = min(*lowestTTL, rec.d_ttl); | |
1384 | *lowestTTL = min(*lowestTTL, getRRSIGTTL(now, rrsig)); | |
1385 | } | |
39ce10b2 PL |
1386 | } |
1387 | if(nsecTypes.count(rrsig->d_type)) { | |
1388 | ne.DNSSECRecords.signatures.push_back(rec); | |
dbbef467 RG |
1389 | if (lowestTTL && isRRSIGNotExpired(now, rrsig)) { |
1390 | *lowestTTL = min(*lowestTTL, rec.d_ttl); | |
1391 | *lowestTTL = min(*lowestTTL, getRRSIGTTL(now, rrsig)); | |
1392 | } | |
39ce10b2 PL |
1393 | } |
1394 | } | |
1395 | continue; | |
1396 | } | |
1397 | if(rec.d_type == QType::SOA) { | |
1398 | ne.authoritySOA.records.push_back(rec); | |
dbbef467 RG |
1399 | if (lowestTTL) { |
1400 | *lowestTTL = min(*lowestTTL, rec.d_ttl); | |
1401 | } | |
39ce10b2 PL |
1402 | continue; |
1403 | } | |
1404 | if(nsecTypes.count(rec.d_type)) { | |
1405 | ne.DNSSECRecords.records.push_back(rec); | |
dbbef467 RG |
1406 | if (lowestTTL) { |
1407 | *lowestTTL = min(*lowestTTL, rec.d_ttl); | |
1408 | } | |
39ce10b2 | 1409 | continue; |
620db2c8 | 1410 | } |
620db2c8 | 1411 | } |
620db2c8 | 1412 | } |
1413 | ||
4d2be65d RG |
1414 | static cspmap_t harvestCSPFromNE(const NegCache::NegCacheEntry& ne) |
1415 | { | |
1416 | cspmap_t cspmap; | |
1417 | for(const auto& rec : ne.DNSSECRecords.signatures) { | |
1418 | if(rec.d_type == QType::RRSIG) { | |
1419 | auto rrc = getRR<RRSIGRecordContent>(rec); | |
1420 | if (rrc) { | |
1421 | cspmap[{rec.d_name,rrc->d_type}].signatures.push_back(rrc); | |
1422 | } | |
1423 | } | |
1424 | } | |
1425 | for(const auto& rec : ne.DNSSECRecords.records) { | |
1426 | cspmap[{rec.d_name, rec.d_type}].records.push_back(rec.d_content); | |
1427 | } | |
1428 | return cspmap; | |
1429 | } | |
1430 | ||
39ce10b2 PL |
1431 | // TODO remove after processRecords is fixed! |
1432 | // Adds the RRSIG for the SOA and the NSEC(3) + RRSIGs to ret | |
620db2c8 | 1433 | static void addNXNSECS(vector<DNSRecord>&ret, const vector<DNSRecord>& records) |
1434 | { | |
39ce10b2 | 1435 | NegCache::NegCacheEntry ne; |
dbbef467 | 1436 | harvestNXRecords(records, ne, 0, nullptr); |
39ce10b2 PL |
1437 | ret.insert(ret.end(), ne.authoritySOA.signatures.begin(), ne.authoritySOA.signatures.end()); |
1438 | ret.insert(ret.end(), ne.DNSSECRecords.records.begin(), ne.DNSSECRecords.records.end()); | |
1439 | ret.insert(ret.end(), ne.DNSSECRecords.signatures.begin(), ne.DNSSECRecords.signatures.end()); | |
620db2c8 | 1440 | } |
1441 | ||
69cbdef9 | 1442 | bool SyncRes::nameserversBlockedByRPZ(const DNSFilterEngine& dfe, const NsSet& nameservers) |
26ca3513 RG |
1443 | { |
1444 | if(d_wantsRPZ) { | |
1445 | for (auto const &ns : nameservers) { | |
69cbdef9 | 1446 | d_appliedPolicy = dfe.getProcessingPolicy(ns.first, d_discardedPolicies); |
26ca3513 RG |
1447 | if (d_appliedPolicy.d_kind != DNSFilterEngine::PolicyKind::NoAction) { // client query needs an RPZ response |
1448 | LOG(", however nameserver "<<ns.first<<" was blocked by RPZ policy '"<<(d_appliedPolicy.d_name ? *d_appliedPolicy.d_name : "")<<"'"<<endl); | |
1449 | return true; | |
1450 | } | |
1451 | ||
1452 | // Traverse all IP addresses for this NS to see if they have an RPN NSIP policy | |
1453 | for (auto const &address : ns.second.first) { | |
69cbdef9 | 1454 | d_appliedPolicy = dfe.getProcessingPolicy(address, d_discardedPolicies); |
26ca3513 RG |
1455 | if (d_appliedPolicy.d_kind != DNSFilterEngine::PolicyKind::NoAction) { // client query needs an RPZ response |
1456 | LOG(", however nameserver "<<ns.first<<" IP address "<<address.toString()<<" was blocked by RPZ policy '"<<(d_appliedPolicy.d_name ? *d_appliedPolicy.d_name : "")<<"'"<<endl); | |
1457 | return true; | |
1458 | } | |
1459 | } | |
1460 | } | |
1461 | } | |
1462 | return false; | |
1463 | } | |
1464 | ||
69cbdef9 | 1465 | bool SyncRes::nameserverIPBlockedByRPZ(const DNSFilterEngine& dfe, const ComboAddress& remoteIP) |
26ca3513 RG |
1466 | { |
1467 | if (d_wantsRPZ) { | |
69cbdef9 | 1468 | d_appliedPolicy = dfe.getProcessingPolicy(remoteIP, d_discardedPolicies); |
26ca3513 RG |
1469 | if (d_appliedPolicy.d_kind != DNSFilterEngine::PolicyKind::NoAction) { |
1470 | LOG(" (blocked by RPZ policy '"+(d_appliedPolicy.d_name ? *d_appliedPolicy.d_name : "")+"')"); | |
1471 | return true; | |
1472 | } | |
1473 | } | |
1474 | return false; | |
1475 | } | |
1476 | ||
b4c8789a | 1477 | 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, bool cacheOnly) |
26ca3513 RG |
1478 | { |
1479 | vector<ComboAddress> result; | |
1480 | ||
1481 | if(!tns->empty()) { | |
1482 | LOG(prefix<<qname<<": Trying to resolve NS '"<<*tns<< "' ("<<1+tns-rnameservers.begin()<<"/"<<(unsigned int)rnameservers.size()<<")"<<endl); | |
b4c8789a | 1483 | result = getAddrs(*tns, depth+2, beenthere, cacheOnly); |
26ca3513 RG |
1484 | pierceDontQuery=false; |
1485 | } | |
1486 | else { | |
1487 | LOG(prefix<<qname<<": Domain has hardcoded nameserver"); | |
1488 | ||
589884b8 | 1489 | if(nameservers[*tns].first.size() > 1) { |
26ca3513 RG |
1490 | LOG("s"); |
1491 | } | |
1492 | LOG(endl); | |
1493 | ||
1494 | sendRDQuery = nameservers[*tns].second; | |
589884b8 | 1495 | result = shuffleForwardSpeed(nameservers[*tns].first, doLog() ? (prefix+qname.toString()+": ") : string(), sendRDQuery); |
26ca3513 RG |
1496 | pierceDontQuery=true; |
1497 | } | |
1498 | return result; | |
1499 | } | |
1500 | ||
1501 | bool SyncRes::throttledOrBlocked(const std::string& prefix, const ComboAddress& remoteIP, const DNSName& qname, const QType& qtype, bool pierceDontQuery) | |
1502 | { | |
a712cb56 | 1503 | if(t_sstorage.throttle.shouldThrottle(d_now.tv_sec, boost::make_tuple(remoteIP, "", 0))) { |
26ca3513 RG |
1504 | LOG(prefix<<qname<<": server throttled "<<endl); |
1505 | s_throttledqueries++; d_throttledqueries++; | |
1506 | return true; | |
1507 | } | |
a712cb56 | 1508 | else if(t_sstorage.throttle.shouldThrottle(d_now.tv_sec, boost::make_tuple(remoteIP, qname, qtype.getCode()))) { |
6dfff36f | 1509 | LOG(prefix<<qname<<": query throttled "<<remoteIP.toString()<<", "<<qname<<"; "<<qtype.getName()<<endl); |
26ca3513 RG |
1510 | s_throttledqueries++; d_throttledqueries++; |
1511 | return true; | |
1512 | } | |
9065eb05 | 1513 | else if(!pierceDontQuery && s_dontQuery && s_dontQuery->match(&remoteIP)) { |
26ca3513 RG |
1514 | LOG(prefix<<qname<<": not sending query to " << remoteIP.toString() << ", blocked by 'dont-query' setting" << endl); |
1515 | s_dontqueries++; | |
1516 | return true; | |
1517 | } | |
1518 | return false; | |
1519 | } | |
1520 | ||
4d2be65d RG |
1521 | bool SyncRes::validationEnabled() const |
1522 | { | |
8455425c | 1523 | return g_dnssecmode != DNSSECMode::Off && g_dnssecmode != DNSSECMode::ProcessNoValidate; |
4d2be65d RG |
1524 | } |
1525 | ||
1526 | uint32_t SyncRes::computeLowestTTD(const std::vector<DNSRecord>& records, const std::vector<std::shared_ptr<RRSIGRecordContent> >& signatures, uint32_t signaturesTTL) const | |
26ca3513 | 1527 | { |
4d2be65d RG |
1528 | uint32_t lowestTTD = std::numeric_limits<uint32_t>::max(); |
1529 | for(const auto& record : records) | |
1530 | lowestTTD = min(lowestTTD, record.d_ttl); | |
1531 | ||
0c43f455 RG |
1532 | /* even if it was not requested for that request (Process, and neither AD nor DO set), |
1533 | it might be requested at a later time so we need to be careful with the TTL. */ | |
4d2be65d | 1534 | if (validationEnabled() && !signatures.empty()) { |
3cef03e9 | 1535 | /* if we are validating, we don't want to cache records after their signatures expire. */ |
4d2be65d RG |
1536 | /* records TTL are now TTD, let's add 'now' to the signatures lowest TTL */ |
1537 | lowestTTD = min(lowestTTD, static_cast<uint32_t>(signaturesTTL + d_now.tv_sec)); | |
1538 | ||
1539 | for(const auto& sig : signatures) { | |
dbbef467 RG |
1540 | if (isRRSIGNotExpired(d_now.tv_sec, sig)) { |
1541 | // we don't decerement d_sigexpire by 'now' because we actually want a TTD, not a TTL */ | |
4d2be65d RG |
1542 | lowestTTD = min(lowestTTD, static_cast<uint32_t>(sig->d_sigexpire)); |
1543 | } | |
1544 | } | |
1545 | } | |
1546 | ||
1547 | return lowestTTD; | |
1548 | } | |
1549 | ||
1550 | void SyncRes::updateValidationState(vState& state, const vState stateUpdate) | |
1551 | { | |
f715542c | 1552 | LOG(d_prefix<<"validation state was "<<std::string(vStates[state])<<", state update is "<<std::string(vStates[stateUpdate])); |
4d2be65d | 1553 | |
895449a5 RG |
1554 | if (stateUpdate == TA) { |
1555 | state = Secure; | |
4d2be65d RG |
1556 | } |
1557 | else if (stateUpdate == NTA) { | |
1558 | state = Insecure; | |
1559 | } | |
895449a5 RG |
1560 | else if (stateUpdate == Bogus) { |
1561 | state = Bogus; | |
1562 | } | |
1563 | else if (state == Indeterminate) { | |
1564 | state = stateUpdate; | |
1565 | } | |
4d2be65d RG |
1566 | else if (stateUpdate == Insecure) { |
1567 | if (state != Bogus) { | |
1568 | state = Insecure; | |
1569 | } | |
1570 | } | |
f715542c | 1571 | LOG(", validation state is now "<<std::string(vStates[state])<<endl); |
4d2be65d RG |
1572 | } |
1573 | ||
1574 | vState SyncRes::getTA(const DNSName& zone, dsmap_t& ds) | |
1575 | { | |
1576 | auto luaLocal = g_luaconfs.getLocal(); | |
1577 | ||
1578 | if (luaLocal->dsAnchors.empty()) { | |
e77f01d1 | 1579 | LOG(d_prefix<<": No trust anchors configured, everything is Insecure"<<endl); |
4d2be65d RG |
1580 | /* We have no TA, everything is insecure */ |
1581 | return Insecure; | |
1582 | } | |
1583 | ||
1584 | std::string reason; | |
1585 | if (haveNegativeTrustAnchor(luaLocal->negAnchors, zone, reason)) { | |
e77f01d1 | 1586 | LOG(d_prefix<<": got NTA for '"<<zone<<"'"<<endl); |
4d2be65d RG |
1587 | return NTA; |
1588 | } | |
1589 | ||
1590 | if (getTrustAnchor(luaLocal->dsAnchors, zone, ds)) { | |
e77f01d1 | 1591 | LOG(d_prefix<<": got TA for '"<<zone<<"'"<<endl); |
895449a5 | 1592 | return TA; |
4d2be65d | 1593 | } |
e77f01d1 | 1594 | else { |
1595 | LOG(d_prefix<<": no TA found for '"<<zone<<"' among "<< luaLocal->dsAnchors.size()<<endl); | |
1596 | } | |
4d2be65d RG |
1597 | |
1598 | if (zone.isRoot()) { | |
1599 | /* No TA for the root */ | |
1600 | return Insecure; | |
1601 | } | |
1602 | ||
1603 | return Indeterminate; | |
1604 | } | |
1605 | ||
8455425c RG |
1606 | static size_t countSupportedDS(const dsmap_t& dsmap) |
1607 | { | |
1608 | size_t count = 0; | |
1609 | ||
1610 | for (const auto& ds : dsmap) { | |
1611 | if (isSupportedDS(ds)) { | |
1612 | count++; | |
1613 | } | |
1614 | } | |
1615 | ||
1616 | return count; | |
1617 | } | |
1618 | ||
5374b03b | 1619 | vState SyncRes::getDSRecords(const DNSName& zone, dsmap_t& ds, bool taOnly, unsigned int depth, bool bogusOnNXD, bool* foundCut) |
4d2be65d RG |
1620 | { |
1621 | vState result = getTA(zone, ds); | |
1622 | ||
1623 | if (result != Indeterminate || taOnly) { | |
5374b03b RG |
1624 | if (foundCut) { |
1625 | *foundCut = (result != Indeterminate); | |
1626 | } | |
1627 | ||
18159e92 RG |
1628 | if (result == TA) { |
1629 | if (countSupportedDS(ds) == 0) { | |
1630 | ds.clear(); | |
1631 | result = Insecure; | |
1632 | } | |
1633 | else { | |
1634 | result = Secure; | |
1635 | } | |
1636 | } | |
1637 | else if (result == NTA) { | |
8455425c RG |
1638 | result = Insecure; |
1639 | } | |
1640 | ||
4d2be65d RG |
1641 | return result; |
1642 | } | |
1643 | ||
1644 | bool oldSkipCNAME = d_skipCNAMECheck; | |
4d2be65d | 1645 | d_skipCNAMECheck = true; |
4d2be65d RG |
1646 | |
1647 | std::set<GetBestNSAnswer> beenthere; | |
1648 | std::vector<DNSRecord> dsrecords; | |
1649 | ||
1650 | vState state = Indeterminate; | |
51b6b728 | 1651 | int rcode = doResolve(zone, QType(QType::DS), dsrecords, depth + 1, beenthere, state); |
4d2be65d | 1652 | d_skipCNAMECheck = oldSkipCNAME; |
4d2be65d | 1653 | |
3ca6d908 | 1654 | if (rcode == RCode::NoError || (rcode == RCode::NXDomain && !bogusOnNXD)) { |
5374b03b | 1655 | |
1e332f68 PL |
1656 | uint8_t bestDigestType = 0; |
1657 | ||
4d2be65d | 1658 | if (state == Secure) { |
1c39e884 | 1659 | bool gotCNAME = false; |
4d2be65d RG |
1660 | for (const auto& record : dsrecords) { |
1661 | if (record.d_type == QType::DS) { | |
1662 | const auto dscontent = getRR<DSRecordContent>(record); | |
8455425c | 1663 | if (dscontent && isSupportedDS(*dscontent)) { |
1e332f68 PL |
1664 | // Make GOST a lower prio than SHA256 |
1665 | if (dscontent->d_digesttype == DNSSECKeeper::GOST && bestDigestType == DNSSECKeeper::SHA256) { | |
1666 | continue; | |
1667 | } | |
1668 | if (dscontent->d_digesttype > bestDigestType || (bestDigestType == DNSSECKeeper::GOST && dscontent->d_digesttype == DNSSECKeeper::SHA256)) { | |
1669 | bestDigestType = dscontent->d_digesttype; | |
1670 | } | |
4d2be65d RG |
1671 | ds.insert(*dscontent); |
1672 | } | |
1673 | } | |
1c39e884 RG |
1674 | else if (record.d_type == QType::CNAME && record.d_name == zone) { |
1675 | gotCNAME = true; | |
1676 | } | |
4d2be65d | 1677 | } |
4d2be65d | 1678 | |
1e332f68 PL |
1679 | /* RFC 4509 section 3: "Validator implementations SHOULD ignore DS RRs containing SHA-1 |
1680 | * digests if DS RRs with SHA-256 digests are present in the DS RRset." | |
1681 | * As SHA348 is specified as well, the spirit of the this line is "use the best algorithm". | |
1682 | */ | |
a211ccb5 RG |
1683 | for (auto dsrec = ds.begin(); dsrec != ds.end(); ) { |
1684 | if (dsrec->d_digesttype != bestDigestType) { | |
1685 | dsrec = ds.erase(dsrec); | |
1686 | } | |
1687 | else { | |
1688 | ++dsrec; | |
1e332f68 PL |
1689 | } |
1690 | } | |
1691 | ||
5374b03b RG |
1692 | if (rcode == RCode::NoError && ds.empty()) { |
1693 | if (foundCut) { | |
1c39e884 | 1694 | if (gotCNAME || denialProvesNoDelegation(zone, dsrecords)) { |
5374b03b RG |
1695 | /* we are still inside the same Secure zone */ |
1696 | ||
1697 | *foundCut = false; | |
1698 | return Secure; | |
1699 | } | |
1700 | ||
1701 | *foundCut = true; | |
1702 | } | |
1703 | ||
b7f378d1 | 1704 | return Insecure; |
5374b03b RG |
1705 | } else if (foundCut && rcode == RCode::NoError && !ds.empty()) { |
1706 | *foundCut = true; | |
b7f378d1 | 1707 | } |
4d2be65d | 1708 | } |
b7f378d1 | 1709 | |
4d2be65d RG |
1710 | return state; |
1711 | } | |
1712 | ||
bcb05770 | 1713 | LOG(d_prefix<<": returning Bogus state from "<<__func__<<"("<<zone<<")"<<endl); |
4d2be65d RG |
1714 | return Bogus; |
1715 | } | |
1716 | ||
0735b60f RG |
1717 | bool SyncRes::haveExactValidationStatus(const DNSName& domain) |
1718 | { | |
e1636f82 | 1719 | if (!shouldValidate()) { |
0735b60f RG |
1720 | return false; |
1721 | } | |
1722 | const auto& it = d_cutStates.find(domain); | |
1723 | if (it != d_cutStates.cend()) { | |
1724 | return true; | |
1725 | } | |
1726 | return false; | |
1727 | } | |
1728 | ||
5374b03b | 1729 | vState SyncRes::getValidationStatus(const DNSName& subdomain, bool allowIndeterminate) |
70b3fe7a RG |
1730 | { |
1731 | vState result = Indeterminate; | |
1732 | ||
e1636f82 | 1733 | if (!shouldValidate()) { |
70b3fe7a RG |
1734 | return result; |
1735 | } | |
1736 | DNSName name(subdomain); | |
1737 | do { | |
51b6b728 RG |
1738 | const auto& it = d_cutStates.find(name); |
1739 | if (it != d_cutStates.cend()) { | |
5374b03b RG |
1740 | if (allowIndeterminate || it->second != Indeterminate) { |
1741 | LOG(d_prefix<<": got status "<<vStates[it->second]<<" for name "<<subdomain<<" (from "<<name<<")"<<endl); | |
1742 | return it->second; | |
1743 | } | |
70b3fe7a RG |
1744 | } |
1745 | } | |
1746 | while (name.chopOff()); | |
1747 | ||
1748 | return result; | |
1749 | } | |
1750 | ||
c405e222 RG |
1751 | bool SyncRes::lookForCut(const DNSName& qname, unsigned int depth, const vState existingState, vState& newState) |
1752 | { | |
1753 | bool foundCut = false; | |
5374b03b RG |
1754 | dsmap_t ds; |
1755 | vState dsState = getDSRecords(qname, ds, newState == Bogus || existingState == Insecure || existingState == Bogus, depth, false, &foundCut); | |
c405e222 | 1756 | |
5374b03b RG |
1757 | if (dsState != Indeterminate) { |
1758 | newState = dsState; | |
1759 | } | |
c405e222 | 1760 | |
c405e222 RG |
1761 | return foundCut; |
1762 | } | |
1763 | ||
51b6b728 | 1764 | void SyncRes::computeZoneCuts(const DNSName& begin, const DNSName& end, unsigned int depth) |
4d2be65d | 1765 | { |
428f41b7 | 1766 | if(!begin.isPartOf(end)) { |
86f1af1c KM |
1767 | LOG(d_prefix<<" "<<begin.toLogString()<<" is not part of "<<end.toLogString()<<endl); |
1768 | throw PDNSException(begin.toLogString() + " is not part of " + end.toLogString()); | |
428f41b7 RG |
1769 | } |
1770 | ||
51b6b728 | 1771 | if (d_cutStates.count(begin) != 0) { |
ad75fdbd | 1772 | return; |
4d2be65d RG |
1773 | } |
1774 | ||
1775 | dsmap_t ds; | |
51b6b728 | 1776 | vState cutState = getDSRecords(end, ds, false, depth); |
bcb05770 | 1777 | LOG(d_prefix<<": setting cut state for "<<end<<" to "<<vStates[cutState]<<endl); |
51b6b728 | 1778 | d_cutStates[end] = cutState; |
70b3fe7a | 1779 | |
e1636f82 | 1780 | if (!shouldValidate()) { |
ad75fdbd | 1781 | return; |
70b3fe7a RG |
1782 | } |
1783 | ||
70b3fe7a RG |
1784 | DNSName qname(end); |
1785 | std::vector<string> labelsToAdd = begin.makeRelative(end).getRawLabels(); | |
1786 | ||
ad75fdbd | 1787 | bool oldSkipCNAME = d_skipCNAMECheck; |
ad75fdbd | 1788 | d_skipCNAMECheck = true; |
ad75fdbd | 1789 | |
70b3fe7a | 1790 | while(qname != begin) { |
70b3fe7a RG |
1791 | if (labelsToAdd.empty()) |
1792 | break; | |
1793 | ||
1794 | qname.prependRawLabel(labelsToAdd.back()); | |
1795 | labelsToAdd.pop_back(); | |
bcb05770 RG |
1796 | LOG(d_prefix<<": - Looking for a cut at "<<qname<<endl); |
1797 | ||
1798 | const auto cutIt = d_cutStates.find(qname); | |
1799 | if (cutIt != d_cutStates.cend()) { | |
1800 | if (cutIt->second != Indeterminate) { | |
1801 | LOG(d_prefix<<": - Cut already known at "<<qname<<endl); | |
3d4e836e | 1802 | cutState = cutIt->second; |
bcb05770 RG |
1803 | continue; |
1804 | } | |
1805 | } | |
70b3fe7a | 1806 | |
3d4e836e RG |
1807 | /* no need to look for NS and DS if we are already insecure or bogus, |
1808 | just look for (N)TA | |
1809 | */ | |
1810 | if (cutState == Insecure || cutState == Bogus) { | |
2010ac95 RG |
1811 | dsmap_t cutDS; |
1812 | vState newState = getDSRecords(qname, cutDS, true, depth); | |
3d4e836e RG |
1813 | if (newState == Indeterminate) { |
1814 | continue; | |
1815 | } | |
1816 | ||
1817 | LOG(d_prefix<<": New state for "<<qname<<" is "<<vStates[newState]<<endl); | |
3d4e836e RG |
1818 | cutState = newState; |
1819 | ||
1820 | d_cutStates[qname] = cutState; | |
1821 | ||
1822 | continue; | |
1823 | } | |
70b3fe7a | 1824 | |
c405e222 | 1825 | vState newState = Indeterminate; |
428f41b7 RG |
1826 | /* temporarily mark as Indeterminate, so that we won't enter an endless loop |
1827 | trying to determine that zone cut again. */ | |
c405e222 RG |
1828 | d_cutStates[qname] = newState; |
1829 | bool foundCut = lookForCut(qname, depth + 1, cutState, newState); | |
1830 | if (foundCut) { | |
1831 | LOG(d_prefix<<": - Found cut at "<<qname<<endl); | |
1832 | if (newState != Indeterminate) { | |
1833 | cutState = newState; | |
70b3fe7a | 1834 | } |
c405e222 RG |
1835 | LOG(d_prefix<<": New state for "<<qname<<" is "<<vStates[cutState]<<endl); |
1836 | d_cutStates[qname] = cutState; | |
70b3fe7a | 1837 | } |
c405e222 | 1838 | else { |
428f41b7 | 1839 | /* remove the temporary cut */ |
b25712fd | 1840 | LOG(d_prefix<<qname<<": removing cut state for "<<qname<<endl); |
51b6b728 | 1841 | d_cutStates.erase(qname); |
428f41b7 | 1842 | } |
70b3fe7a RG |
1843 | } |
1844 | ||
ad75fdbd | 1845 | d_skipCNAMECheck = oldSkipCNAME; |
ad75fdbd | 1846 | |
bcb05770 | 1847 | LOG(d_prefix<<": list of cuts from "<<begin<<" to "<<end<<endl); |
51b6b728 | 1848 | for (const auto& cut : d_cutStates) { |
bcb05770 | 1849 | if (cut.first.isRoot() || (begin.isPartOf(cut.first) && cut.first.isPartOf(end))) { |
51b6b728 RG |
1850 | LOG(" - "<<cut.first<<": "<<vStates[cut.second]<<endl); |
1851 | } | |
70b3fe7a | 1852 | } |
4d2be65d RG |
1853 | } |
1854 | ||
51b6b728 | 1855 | vState SyncRes::validateDNSKeys(const DNSName& zone, const std::vector<DNSRecord>& dnskeys, const std::vector<std::shared_ptr<RRSIGRecordContent> >& signatures, unsigned int depth) |
4d2be65d RG |
1856 | { |
1857 | dsmap_t ds; | |
1858 | if (!signatures.empty()) { | |
1859 | DNSName signer = getSigner(signatures); | |
1860 | ||
8d2e7fa1 | 1861 | if (!signer.empty() && zone.isPartOf(signer)) { |
51b6b728 | 1862 | vState state = getDSRecords(signer, ds, false, depth); |
b7f378d1 | 1863 | |
4d2be65d RG |
1864 | if (state != Secure) { |
1865 | return state; | |
1866 | } | |
1867 | } | |
1868 | } | |
1869 | ||
1870 | skeyset_t tentativeKeys; | |
1871 | std::vector<shared_ptr<DNSRecordContent> > toSign; | |
1872 | ||
1873 | for (const auto& dnskey : dnskeys) { | |
1874 | if (dnskey.d_type == QType::DNSKEY) { | |
1875 | auto content = getRR<DNSKEYRecordContent>(dnskey); | |
1876 | if (content) { | |
1877 | tentativeKeys.insert(content); | |
1878 | toSign.push_back(content); | |
1879 | } | |
1880 | } | |
1881 | } | |
1882 | ||
bcb05770 | 1883 | LOG(d_prefix<<": trying to validate "<<std::to_string(tentativeKeys.size())<<" DNSKEYs with "<<std::to_string(ds.size())<<" DS"<<endl); |
4d2be65d RG |
1884 | skeyset_t validatedKeys; |
1885 | validateDNSKeysAgainstDS(d_now.tv_sec, zone, ds, tentativeKeys, toSign, signatures, validatedKeys); | |
1886 | ||
bcb05770 | 1887 | LOG(d_prefix<<": we now have "<<std::to_string(validatedKeys.size())<<" DNSKEYs"<<endl); |
4d2be65d | 1888 | |
82fbd934 RG |
1889 | /* if we found at least one valid RRSIG covering the set, |
1890 | all tentative keys are validated keys. Otherwise it means | |
1891 | we haven't found at least one DNSKEY and a matching RRSIG | |
1892 | covering this set, this looks Bogus. */ | |
4d2be65d | 1893 | if (validatedKeys.size() != tentativeKeys.size()) { |
bcb05770 | 1894 | LOG(d_prefix<<": returning Bogus state from "<<__func__<<"("<<zone<<")"<<endl); |
4d2be65d RG |
1895 | return Bogus; |
1896 | } | |
1897 | ||
1898 | return Secure; | |
1899 | } | |
1900 | ||
51b6b728 | 1901 | vState SyncRes::getDNSKeys(const DNSName& signer, skeyset_t& keys, unsigned int depth) |
4d2be65d RG |
1902 | { |
1903 | std::vector<DNSRecord> records; | |
1904 | std::set<GetBestNSAnswer> beenthere; | |
bcb05770 | 1905 | LOG(d_prefix<<"Retrieving DNSKeys for "<<signer<<endl); |
4d2be65d RG |
1906 | |
1907 | vState state = Indeterminate; | |
c7385ddb RG |
1908 | /* following CNAME might lead to us to the wrong DNSKEY */ |
1909 | bool oldSkipCNAME = d_skipCNAMECheck; | |
1910 | d_skipCNAMECheck = true; | |
51b6b728 | 1911 | int rcode = doResolve(signer, QType(QType::DNSKEY), records, depth + 1, beenthere, state); |
c7385ddb | 1912 | d_skipCNAMECheck = oldSkipCNAME; |
4d2be65d RG |
1913 | |
1914 | if (rcode == RCode::NoError) { | |
1915 | if (state == Secure) { | |
1916 | for (const auto& key : records) { | |
1917 | if (key.d_type == QType::DNSKEY) { | |
1918 | auto content = getRR<DNSKEYRecordContent>(key); | |
1919 | if (content) { | |
1920 | keys.insert(content); | |
1921 | } | |
1922 | } | |
1923 | } | |
1924 | } | |
bcb05770 | 1925 | LOG(d_prefix<<"Retrieved "<<keys.size()<<" DNSKeys for "<<signer<<", state is "<<vStates[state]<<endl); |
4d2be65d RG |
1926 | return state; |
1927 | } | |
1928 | ||
bcb05770 | 1929 | LOG(d_prefix<<"Returning Bogus state from "<<__func__<<"("<<signer<<")"<<endl); |
4d2be65d RG |
1930 | return Bogus; |
1931 | } | |
1932 | ||
51b6b728 | 1933 | 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) |
4d2be65d RG |
1934 | { |
1935 | skeyset_t keys; | |
1936 | if (!signatures.empty()) { | |
1937 | const DNSName signer = getSigner(signatures); | |
1938 | if (!signer.empty() && name.isPartOf(signer)) { | |
f715542c | 1939 | if ((qtype == QType::DNSKEY || qtype == QType::DS) && signer == qname) { |
15f44f1d RG |
1940 | /* we are already retrieving those keys, sorry */ |
1941 | return Indeterminate; | |
1942 | } | |
51b6b728 | 1943 | vState state = getDNSKeys(signer, keys, depth); |
4d2be65d RG |
1944 | if (state != Secure) { |
1945 | return state; | |
1946 | } | |
1947 | } | |
1948 | } else { | |
bcb05770 | 1949 | LOG(d_prefix<<"Bogus!"<<endl); |
4d2be65d RG |
1950 | return Bogus; |
1951 | } | |
1952 | ||
1953 | std::vector<std::shared_ptr<DNSRecordContent> > recordcontents; | |
1954 | for (const auto& record : records) { | |
1955 | recordcontents.push_back(record.d_content); | |
1956 | } | |
1957 | ||
bcb05770 | 1958 | LOG(d_prefix<<"Going to validate "<<recordcontents.size()<< " record contents with "<<signatures.size()<<" sigs and "<<keys.size()<<" keys for "<<name<<endl); |
4d2be65d | 1959 | if (validateWithKeySet(d_now.tv_sec, name, recordcontents, signatures, keys, false)) { |
bcb05770 | 1960 | LOG(d_prefix<<"Secure!"<<endl); |
4d2be65d RG |
1961 | return Secure; |
1962 | } | |
1963 | ||
bcb05770 | 1964 | LOG(d_prefix<<"Bogus!"<<endl); |
4d2be65d RG |
1965 | return Bogus; |
1966 | } | |
1967 | ||
e4894ce0 | 1968 | 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, bool& needWildcardProof, unsigned int& wildcardLabelsCount) |
4d2be65d | 1969 | { |
26ca3513 RG |
1970 | tcache_t tcache; |
1971 | ||
4d2be65d RG |
1972 | string prefix; |
1973 | if(doLog()) { | |
1974 | prefix=d_prefix; | |
1975 | prefix.append(depth, ' '); | |
1976 | } | |
1977 | ||
2b984251 | 1978 | std::vector<std::shared_ptr<DNSRecord>> authorityRecs; |
142ab370 | 1979 | const unsigned int labelCount = qname.countLabels(); |
a82d4e27 | 1980 | bool isCNAMEAnswer = false; |
26ca3513 | 1981 | for(const auto& rec : lwr.d_records) { |
c5310862 RG |
1982 | if (rec.d_class != QClass::IN) { |
1983 | continue; | |
1984 | } | |
1985 | ||
a82d4e27 RG |
1986 | if(!isCNAMEAnswer && rec.d_place == DNSResourceRecord::ANSWER && rec.d_type == QType::CNAME && (!(qtype==QType(QType::CNAME))) && rec.d_name == qname) { |
1987 | isCNAMEAnswer = true; | |
1988 | } | |
1989 | ||
9b061cf5 RG |
1990 | /* if we have a positive answer synthetized from a wildcard, |
1991 | we need to store the corresponding NSEC/NSEC3 records proving | |
1992 | that the exact name did not exist in the negative cache */ | |
2b984251 RG |
1993 | if(needWildcardProof) { |
1994 | if (nsecTypes.count(rec.d_type)) { | |
1995 | authorityRecs.push_back(std::make_shared<DNSRecord>(rec)); | |
1996 | } | |
1997 | else if (rec.d_type == QType::RRSIG) { | |
1998 | auto rrsig = getRR<RRSIGRecordContent>(rec); | |
1999 | if (rrsig && nsecTypes.count(rrsig->d_type)) { | |
2000 | authorityRecs.push_back(std::make_shared<DNSRecord>(rec)); | |
2001 | } | |
2002 | } | |
2003 | } | |
26ca3513 RG |
2004 | if(rec.d_type == QType::RRSIG) { |
2005 | auto rrsig = getRR<RRSIGRecordContent>(rec); | |
2006 | if (rrsig) { | |
bb07ad8e RG |
2007 | /* As illustrated in rfc4035's Appendix B.6, the RRSIG label |
2008 | count can be lower than the name's label count if it was | |
9b061cf5 | 2009 | synthetized from the wildcard. Note that the difference might |
bb07ad8e RG |
2010 | be > 1. */ |
2011 | if (rec.d_name == qname && rrsig->d_labels < labelCount) { | |
9b061cf5 | 2012 | LOG(prefix<<qname<<": RRSIG indicates the name was synthetized from a wildcard, we need a wildcard proof"<<endl); |
2b984251 | 2013 | needWildcardProof = true; |
e4894ce0 | 2014 | wildcardLabelsCount = rrsig->d_labels; |
2b984251 RG |
2015 | } |
2016 | ||
26ca3513 RG |
2017 | // cerr<<"Got an RRSIG for "<<DNSRecordContent::NumberToType(rrsig->d_type)<<" with name '"<<rec.d_name<<"'"<<endl; |
2018 | tcache[{rec.d_name, rrsig->d_type, rec.d_place}].signatures.push_back(rrsig); | |
4d2be65d | 2019 | 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 |
2020 | } |
2021 | } | |
2022 | } | |
2023 | ||
2024 | // reap all answers from this packet that are acceptable | |
2025 | for(auto& rec : lwr.d_records) { | |
2026 | if(rec.d_type == QType::OPT) { | |
2027 | LOG(prefix<<qname<<": OPT answer '"<<rec.d_name<<"' from '"<<auth<<"' nameservers" <<endl); | |
2028 | continue; | |
2029 | } | |
e77f01d1 | 2030 | LOG(prefix<<qname<<": accept answer '"<<rec.d_name<<"|"<<DNSRecordContent::NumberToType(rec.d_type)<<"|"<<rec.d_content->getZoneRepresentation()<<"' from '"<<auth<<"' nameservers? ttl="<<rec.d_ttl<<", place="<<(int)rec.d_place<<" "); |
26ca3513 | 2031 | if(rec.d_type == QType::ANY) { |
c5310862 RG |
2032 | LOG("NO! - we don't accept 'ANY'-typed data"<<endl); |
2033 | continue; | |
2034 | } | |
2035 | ||
2036 | if(rec.d_class != QClass::IN) { | |
2037 | LOG("NO! - we don't accept records for any other class than 'IN'"<<endl); | |
26ca3513 RG |
2038 | continue; |
2039 | } | |
2040 | ||
2041 | if(rec.d_name.isPartOf(auth)) { | |
2042 | if(rec.d_type == QType::RRSIG) { | |
2043 | LOG("RRSIG - separate"<<endl); | |
2044 | } | |
4d2be65d | 2045 | 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 |
2046 | LOG("NO! Is from delegation-only zone"<<endl); |
2047 | s_nodelegated++; | |
2048 | return RCode::NXDomain; | |
2049 | } | |
2050 | else { | |
2051 | bool haveLogged = false; | |
a712cb56 | 2052 | if (!t_sstorage.domainmap->empty()) { |
26ca3513 RG |
2053 | // Check if we are authoritative for a zone in this answer |
2054 | DNSName tmp_qname(rec.d_name); | |
2055 | auto auth_domain_iter=getBestAuthZone(&tmp_qname); | |
a712cb56 | 2056 | if(auth_domain_iter!=t_sstorage.domainmap->end() && |
26ca3513 RG |
2057 | auth.countLabels() <= auth_domain_iter->first.countLabels()) { |
2058 | if (auth_domain_iter->first != auth) { | |
2059 | LOG("NO! - we are authoritative for the zone "<<auth_domain_iter->first<<endl); | |
2060 | continue; | |
2061 | } else { | |
2062 | LOG("YES! - This answer was "); | |
6dfff36f | 2063 | if (!wasForwarded) { |
26ca3513 RG |
2064 | LOG("retrieved from the local auth store."); |
2065 | } else { | |
2066 | LOG("received from a server we forward to."); | |
2067 | } | |
2068 | haveLogged = true; | |
2069 | LOG(endl); | |
2070 | } | |
2071 | } | |
2072 | } | |
2073 | if (!haveLogged) { | |
2074 | LOG("YES!"<<endl); | |
2075 | } | |
2076 | ||
2077 | rec.d_ttl=min(s_maxcachettl, rec.d_ttl); | |
2078 | ||
2079 | DNSRecord dr(rec); | |
26ca3513 | 2080 | dr.d_ttl += d_now.tv_sec; |
2b984251 | 2081 | dr.d_place=DNSResourceRecord::ANSWER; |
26ca3513 RG |
2082 | tcache[{rec.d_name,rec.d_type,rec.d_place}].records.push_back(dr); |
2083 | } | |
2084 | } | |
2085 | else | |
2086 | LOG("NO!"<<endl); | |
2087 | } | |
2088 | ||
2089 | // supplant | |
4d2be65d RG |
2090 | for(tcache_t::iterator i = tcache.begin(); i != tcache.end(); ++i) { |
2091 | 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) | |
2092 | uint32_t lowestTTD=computeLowestTTD(i->second.records, i->second.signatures, i->second.signaturesTTL); | |
26ca3513 RG |
2093 | |
2094 | for(auto& record : i->second.records) | |
4d2be65d | 2095 | record.d_ttl = lowestTTD; // boom |
26ca3513 RG |
2096 | } |
2097 | ||
2098 | // cout<<"Have "<<i->second.records.size()<<" records and "<<i->second.signatures.size()<<" signatures for "<<i->first.name; | |
2099 | // cout<<'|'<<DNSRecordContent::NumberToType(i->first.type)<<endl; | |
4d2be65d RG |
2100 | } |
2101 | ||
2102 | for(tcache_t::iterator i = tcache.begin(); i != tcache.end(); ++i) { | |
4d2be65d | 2103 | |
26ca3513 RG |
2104 | if(i->second.records.empty()) // this happens when we did store signatures, but passed on the records themselves |
2105 | continue; | |
6dfff36f | 2106 | |
405a26bd RG |
2107 | /* Even if the AA bit is set, additional data cannot be considered |
2108 | as authoritative. This is especially important during validation | |
2109 | because keeping records in the additional section is allowed even | |
2110 | if the corresponding RRSIGs are not included, without setting the TC | |
2111 | bit, as stated in rfc4035's section 3.1.1. Including RRSIG RRs in a Response: | |
2112 | "When placing a signed RRset in the Additional section, the name | |
2113 | server MUST also place its RRSIG RRs in the Additional section. | |
2114 | If space does not permit inclusion of both the RRset and its | |
2115 | associated RRSIG RRs, the name server MAY retain the RRset while | |
2116 | dropping the RRSIG RRs. If this happens, the name server MUST NOT | |
2117 | set the TC bit solely because these RRSIG RRs didn't fit." | |
2118 | */ | |
2119 | bool isAA = lwr.d_aabit && i->first.place != DNSResourceRecord::ADDITIONAL; | |
cdc5d0c0 | 2120 | if (isAA && isCNAMEAnswer && i->first.place == DNSResourceRecord::ANSWER && (i->first.type != QType::CNAME || i->first.name != qname)) { |
a82d4e27 RG |
2121 | /* |
2122 | rfc2181 states: | |
2123 | Note that the answer section of an authoritative answer normally | |
2124 | contains only authoritative data. However when the name sought is an | |
2125 | alias (see section 10.1.1) only the record describing that alias is | |
2126 | necessarily authoritative. Clients should assume that other records | |
2127 | may have come from the server's cache. Where authoritative answers | |
2128 | are required, the client should query again, using the canonical name | |
2129 | associated with the alias. | |
2130 | */ | |
2131 | isAA = false; | |
2132 | } | |
2133 | ||
5374b03b | 2134 | vState recordState = getValidationStatus(i->first.name, false); |
1a8d6a9e | 2135 | LOG(d_prefix<<": got initial zone status "<<vStates[recordState]<<" for record "<<i->first.name<<"|"<<DNSRecordContent::NumberToType(i->first.type)<<endl); |
70b3fe7a | 2136 | |
e1636f82 | 2137 | if (shouldValidate() && recordState == Secure) { |
5374b03b RG |
2138 | vState initialState = recordState; |
2139 | ||
a82d4e27 | 2140 | if (isAA) { |
4d2be65d RG |
2141 | if (i->first.place != DNSResourceRecord::ADDITIONAL) { |
2142 | /* the additional entries can be insecure, | |
2143 | like glue: | |
2144 | "Glue address RRsets associated with delegations MUST NOT be signed" | |
2145 | */ | |
2146 | if (i->first.type == QType::DNSKEY && i->first.place == DNSResourceRecord::ANSWER) { | |
bcb05770 | 2147 | LOG(d_prefix<<"Validating DNSKEY for "<<i->first.name<<endl); |
51b6b728 | 2148 | recordState = validateDNSKeys(i->first.name, i->second.records, i->second.signatures, depth); |
4d2be65d RG |
2149 | } |
2150 | else { | |
bcb05770 | 2151 | LOG(d_prefix<<"Validating non-additional record for "<<i->first.name<<endl); |
51b6b728 | 2152 | recordState = validateRecordsWithSigs(depth, qname, qtype, i->first.name, i->second.records, i->second.signatures); |
0735b60f RG |
2153 | /* we might have missed a cut (zone cut within the same auth servers), causing the NS query for an Insecure zone to seem Bogus during zone cut determination */ |
2154 | if (qtype == QType::NS && i->second.signatures.empty() && recordState == Bogus && haveExactValidationStatus(i->first.name) && getValidationStatus(i->first.name) == Indeterminate) { | |
2155 | recordState = Indeterminate; | |
2156 | } | |
4d2be65d RG |
2157 | } |
2158 | } | |
2159 | } | |
2160 | else { | |
933299e8 RG |
2161 | recordState = Indeterminate; |
2162 | ||
a82d4e27 | 2163 | /* in a non authoritative answer, we only care about the DS record (or lack of) */ |
88cb0fe0 | 2164 | if ((i->first.type == QType::DS || i->first.type == QType::NSEC || i->first.type == QType::NSEC3) && i->first.place == DNSResourceRecord::AUTHORITY) { |
bcb05770 | 2165 | LOG(d_prefix<<"Validating DS record for "<<i->first.name<<endl); |
51b6b728 | 2166 | recordState = validateRecordsWithSigs(depth, qname, qtype, i->first.name, i->second.records, i->second.signatures); |
4d2be65d RG |
2167 | } |
2168 | } | |
0735b60f | 2169 | |
933299e8 | 2170 | if (initialState == Secure && state != recordState && isAA) { |
5374b03b RG |
2171 | updateValidationState(state, recordState); |
2172 | } | |
4d2be65d RG |
2173 | } |
2174 | else { | |
e1636f82 | 2175 | if (shouldValidate()) { |
bcb05770 | 2176 | LOG(d_prefix<<"Skipping validation because the current state is "<<vStates[recordState]<<endl); |
4d2be65d RG |
2177 | } |
2178 | } | |
2179 | ||
005b4b98 RG |
2180 | /* We don't need to store NSEC3 records in the positive cache because: |
2181 | - we don't allow direct NSEC3 queries | |
2182 | - denial of existence proofs in wildcard expanded positive responses are stored in authorityRecs | |
2183 | - denial of existence proofs for negative responses are stored in the negative cache | |
2184 | */ | |
2185 | if (i->first.type != QType::NSEC3) { | |
142ab370 | 2186 | t_RC->replace(d_now.tv_sec, i->first.name, QType(i->first.type), i->second.records, i->second.signatures, authorityRecs, i->first.type == QType::DS ? true : isAA, i->first.place == DNSResourceRecord::ANSWER ? ednsmask : boost::none, recordState); |
005b4b98 | 2187 | } |
6dfff36f | 2188 | |
26ca3513 RG |
2189 | if(i->first.place == DNSResourceRecord::ANSWER && ednsmask) |
2190 | d_wasVariable=true; | |
2191 | } | |
2192 | ||
2193 | return RCode::NoError; | |
2194 | } | |
2195 | ||
28364e4b | 2196 | void SyncRes::updateDenialValidationState(vState& neValidationState, const DNSName& neName, vState& state, const dState denialState, const dState expectedState, bool allowOptOut) |
4d2be65d | 2197 | { |
b25712fd | 2198 | if (denialState == expectedState) { |
28364e4b | 2199 | neValidationState = Secure; |
b25712fd RG |
2200 | } |
2201 | else { | |
142ab370 | 2202 | if (denialState == OPTOUT && allowOptOut) { |
28364e4b RG |
2203 | LOG(d_prefix<<"OPT-out denial found for "<<neName<<endl); |
2204 | neValidationState = Secure; | |
142ab370 | 2205 | return; |
4d2be65d | 2206 | } |
142ab370 | 2207 | else if (denialState == INSECURE) { |
28364e4b RG |
2208 | LOG(d_prefix<<"Insecure denial found for "<<neName<<", returning Insecure"<<endl); |
2209 | neValidationState = Insecure; | |
4d2be65d | 2210 | } |
142ab370 | 2211 | else { |
28364e4b RG |
2212 | LOG(d_prefix<<"Invalid denial found for "<<neName<<", returning Bogus, res="<<denialState<<", expectedState="<<expectedState<<endl); |
2213 | neValidationState = Bogus; | |
142ab370 | 2214 | } |
28364e4b | 2215 | updateValidationState(state, neValidationState); |
4d2be65d RG |
2216 | } |
2217 | } | |
2218 | ||
28364e4b | 2219 | dState SyncRes::getDenialValidationState(const NegCache::NegCacheEntry& ne, const vState state, const dState expectedState, bool referralToUnsigned) |
142ab370 RG |
2220 | { |
2221 | cspmap_t csp = harvestCSPFromNE(ne); | |
2222 | return getDenial(csp, ne.d_name, ne.d_qtype.getCode(), referralToUnsigned, expectedState == NXQTYPE); | |
2223 | } | |
2224 | ||
e4894ce0 | 2225 | 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, const bool needWildcardProof, const unsigned int wildcardLabelsCount) |
26ca3513 RG |
2226 | { |
2227 | bool done = false; | |
2228 | ||
2229 | for(auto& rec : lwr.d_records) { | |
2230 | if (rec.d_type!=QType::OPT && rec.d_class!=QClass::IN) | |
2231 | continue; | |
2232 | ||
2233 | if(rec.d_place==DNSResourceRecord::AUTHORITY && rec.d_type==QType::SOA && | |
2234 | lwr.d_rcode==RCode::NXDomain && qname.isPartOf(rec.d_name) && rec.d_name.isPartOf(auth)) { | |
2235 | LOG(prefix<<qname<<": got negative caching indication for name '"<<qname<<"' (accept="<<rec.d_name.isPartOf(auth)<<"), newtarget='"<<newtarget<<"'"<<endl); | |
2236 | ||
2237 | rec.d_ttl = min(rec.d_ttl, s_maxnegttl); | |
2238 | if(newtarget.empty()) // only add a SOA if we're not going anywhere after this | |
2239 | ret.push_back(rec); | |
39ce10b2 | 2240 | |
114829cc RG |
2241 | NegCache::NegCacheEntry ne; |
2242 | ||
dbbef467 | 2243 | uint32_t lowestTTL = rec.d_ttl; |
9b061cf5 RG |
2244 | /* if we get an NXDomain answer with a CNAME, the name |
2245 | does exist but the target does not */ | |
2246 | ne.d_name = newtarget.empty() ? qname : newtarget; | |
114829cc RG |
2247 | ne.d_qtype = QType(0); // this encodes 'whole record' |
2248 | ne.d_auth = rec.d_name; | |
dbbef467 RG |
2249 | harvestNXRecords(lwr.d_records, ne, d_now.tv_sec, &lowestTTL); |
2250 | ne.d_ttd = d_now.tv_sec + lowestTTL; | |
2251 | ||
142ab370 RG |
2252 | if (state == Secure) { |
2253 | dState denialState = getDenialValidationState(ne, state, NXDOMAIN, false); | |
28364e4b | 2254 | updateDenialValidationState(ne.d_validationState, ne.d_name, state, denialState, NXDOMAIN, false); |
142ab370 RG |
2255 | } |
2256 | else { | |
2257 | ne.d_validationState = state; | |
2258 | } | |
114829cc | 2259 | |
9b061cf5 RG |
2260 | /* if we get an NXDomain answer with a CNAME, let's not cache the |
2261 | target, even the server was authoritative for it, | |
2262 | and do an additional query for the CNAME target. | |
2263 | We have a regression test making sure we do exactly that. | |
2264 | */ | |
2265 | if(!wasVariable() && newtarget.empty()) { | |
a712cb56 | 2266 | t_sstorage.negcache.add(ne); |
07e3cfb6 | 2267 | if(s_rootNXTrust && ne.d_auth.isRoot() && auth.isRoot()) { |
9a1e060b | 2268 | ne.d_name = ne.d_name.getLastLabel(); |
a712cb56 | 2269 | t_sstorage.negcache.add(ne); |
26ca3513 RG |
2270 | } |
2271 | } | |
2272 | ||
2273 | negindic=true; | |
2274 | } | |
4d2be65d | 2275 | else if(rec.d_place==DNSResourceRecord::ANSWER && rec.d_type==QType::CNAME && (!(qtype==QType(QType::CNAME))) && rec.d_name == qname) { |
26ca3513 RG |
2276 | ret.push_back(rec); |
2277 | if (auto content = getRR<CNAMERecordContent>(rec)) { | |
2278 | newtarget=content->getTarget(); | |
2279 | } | |
2280 | } | |
9b061cf5 RG |
2281 | /* if we have a positive answer synthetized from a wildcard, we need to |
2282 | return the corresponding NSEC/NSEC3 records from the AUTHORITY section | |
2283 | proving that the exact name did not exist */ | |
2b984251 RG |
2284 | else if(needWildcardProof && (rec.d_type==QType::RRSIG || rec.d_type==QType::NSEC || rec.d_type==QType::NSEC3) && rec.d_place==DNSResourceRecord::AUTHORITY) { |
2285 | ret.push_back(rec); // enjoy your DNSSEC | |
2286 | } | |
26ca3513 RG |
2287 | // for ANY answers we *must* have an authoritative answer, unless we are forwarding recursively |
2288 | else if(rec.d_place==DNSResourceRecord::ANSWER && rec.d_name == qname && | |
2289 | ( | |
331222c4 | 2290 | rec.d_type==qtype.getCode() || ((lwr.d_aabit || sendRDQuery) && qtype == QType(QType::ANY)) |
26ca3513 RG |
2291 | ) |
2292 | ) | |
2293 | { | |
2294 | LOG(prefix<<qname<<": answer is in: resolved to '"<< rec.d_content->getZoneRepresentation()<<"|"<<DNSRecordContent::NumberToType(rec.d_type)<<"'"<<endl); | |
2295 | ||
2296 | done=true; | |
2297 | ret.push_back(rec); | |
9b061cf5 RG |
2298 | |
2299 | if (state == Secure && needWildcardProof) { | |
2300 | /* We have a positive answer synthetized from a wildcard, we need to check that we have | |
2301 | proof that the exact name doesn't exist so the wildcard can be used, | |
2302 | as described in section 5.3.4 of RFC 4035 and 5.3 of FRC 7129. | |
2303 | */ | |
2304 | NegCache::NegCacheEntry ne; | |
2305 | ||
2306 | uint32_t lowestTTL = rec.d_ttl; | |
2307 | ne.d_name = qname; | |
2308 | ne.d_qtype = QType(0); // this encodes 'whole record' | |
2309 | harvestNXRecords(lwr.d_records, ne, d_now.tv_sec, &lowestTTL); | |
2310 | ||
2311 | cspmap_t csp = harvestCSPFromNE(ne); | |
e4894ce0 | 2312 | dState res = getDenial(csp, qname, ne.d_qtype.getCode(), false, false, false, wildcardLabelsCount); |
9b061cf5 | 2313 | if (res != NXDOMAIN) { |
b7c40613 RG |
2314 | vState st = Bogus; |
2315 | if (res == INSECURE) { | |
2316 | /* Some part could not be validated, for example a NSEC3 record with a too large number of iterations, | |
2317 | this is not enough to warrant a Bogus, but go Insecure. */ | |
2318 | st = Insecure; | |
2319 | LOG(d_prefix<<"Unable to validate denial in wildcard expanded positive response found for "<<qname<<", returning Insecure, res="<<res<<endl); | |
2320 | } | |
2321 | else { | |
2322 | LOG(d_prefix<<"Invalid denial in wildcard expanded positive response found for "<<qname<<", returning Bogus, res="<<res<<endl); | |
2323 | } | |
2324 | ||
2325 | updateValidationState(state, st); | |
2326 | /* we already stored the record with a different validation status, let's fix it */ | |
2fe3354d | 2327 | t_RC->updateValidationStatus(d_now.tv_sec, qname, qtype, d_cacheRemote, lwr.d_aabit, st); |
9b061cf5 RG |
2328 | } |
2329 | } | |
26ca3513 | 2330 | } |
7030a59b RG |
2331 | else if((rec.d_type==QType::RRSIG || rec.d_type==QType::NSEC || rec.d_type==QType::NSEC3) && rec.d_place==DNSResourceRecord::ANSWER) { |
2332 | if(rec.d_type != QType::RRSIG || rec.d_name == qname) | |
2333 | ret.push_back(rec); // enjoy your DNSSEC | |
2334 | } | |
4d2be65d | 2335 | else if(rec.d_place==DNSResourceRecord::AUTHORITY && rec.d_type==QType::NS && qname.isPartOf(rec.d_name)) { |
26ca3513 RG |
2336 | if(moreSpecificThan(rec.d_name,auth)) { |
2337 | newauth=rec.d_name; | |
2338 | LOG(prefix<<qname<<": got NS record '"<<rec.d_name<<"' -> '"<<rec.d_content->getZoneRepresentation()<<"'"<<endl); | |
2339 | realreferral=true; | |
2340 | } | |
2341 | else { | |
2342 | LOG(prefix<<qname<<": got upwards/level NS record '"<<rec.d_name<<"' -> '"<<rec.d_content->getZoneRepresentation()<<"', had '"<<auth<<"'"<<endl); | |
2343 | } | |
2344 | if (auto content = getRR<NSRecordContent>(rec)) { | |
2345 | nsset.insert(content->getNS()); | |
2346 | } | |
2347 | } | |
4d2be65d | 2348 | else if(rec.d_place==DNSResourceRecord::AUTHORITY && rec.d_type==QType::DS && qname.isPartOf(rec.d_name)) { |
26ca3513 | 2349 | LOG(prefix<<qname<<": got DS record '"<<rec.d_name<<"' -> '"<<rec.d_content->getZoneRepresentation()<<"'"<<endl); |
26ca3513 | 2350 | } |
860d5e8e | 2351 | else if(realreferral && rec.d_place==DNSResourceRecord::AUTHORITY && (rec.d_type==QType::NSEC || rec.d_type==QType::NSEC3) && newauth.isPartOf(auth)) { |
4d2be65d RG |
2352 | /* we might have received a denial of the DS, let's check */ |
2353 | if (state == Secure) { | |
2354 | NegCache::NegCacheEntry ne; | |
2355 | ne.d_auth = auth; | |
860d5e8e RG |
2356 | ne.d_name = newauth; |
2357 | ne.d_qtype = QType::DS; | |
dbbef467 RG |
2358 | rec.d_ttl = min(s_maxnegttl, rec.d_ttl); |
2359 | uint32_t lowestTTL = rec.d_ttl; | |
2360 | harvestNXRecords(lwr.d_records, ne, d_now.tv_sec, &lowestTTL); | |
2361 | ||
142ab370 RG |
2362 | dState denialState = getDenialValidationState(ne, state, NXQTYPE, true); |
2363 | ||
d377bb54 | 2364 | if (denialState == NXQTYPE || denialState == OPTOUT || denialState == INSECURE) { |
dbbef467 | 2365 | ne.d_ttd = lowestTTL + d_now.tv_sec; |
860d5e8e | 2366 | ne.d_validationState = Secure; |
812c3a69 | 2367 | LOG(prefix<<qname<<": got negative indication of DS record for '"<<newauth<<"'"<<endl); |
5374b03b | 2368 | |
4d2be65d RG |
2369 | if(!wasVariable()) { |
2370 | t_sstorage.negcache.add(ne); | |
2371 | } | |
5374b03b RG |
2372 | |
2373 | if (qname == newauth && qtype == QType::DS) { | |
2374 | /* we are actually done! */ | |
2375 | negindic=true; | |
2376 | nsset.clear(); | |
2377 | } | |
4d2be65d RG |
2378 | } |
2379 | } | |
2380 | } | |
2381 | else if(!done && rec.d_place==DNSResourceRecord::AUTHORITY && rec.d_type==QType::SOA && | |
2382 | lwr.d_rcode==RCode::NoError && qname.isPartOf(rec.d_name)) { | |
26ca3513 RG |
2383 | LOG(prefix<<qname<<": got negative caching indication for '"<< qname<<"|"<<qtype.getName()<<"'"<<endl); |
2384 | ||
2385 | if(!newtarget.empty()) { | |
2386 | LOG(prefix<<qname<<": Hang on! Got a redirect to '"<<newtarget<<"' already"<<endl); | |
2387 | } | |
2388 | else { | |
2389 | rec.d_ttl = min(s_maxnegttl, rec.d_ttl); | |
2390 | ret.push_back(rec); | |
114829cc RG |
2391 | |
2392 | NegCache::NegCacheEntry ne; | |
2393 | ne.d_auth = rec.d_name; | |
dbbef467 | 2394 | uint32_t lowestTTL = rec.d_ttl; |
114829cc RG |
2395 | ne.d_name = qname; |
2396 | ne.d_qtype = qtype; | |
dbbef467 RG |
2397 | harvestNXRecords(lwr.d_records, ne, d_now.tv_sec, &lowestTTL); |
2398 | ne.d_ttd = d_now.tv_sec + lowestTTL; | |
2399 | ||
142ab370 RG |
2400 | if (state == Secure) { |
2401 | dState denialState = getDenialValidationState(ne, state, NXQTYPE, false); | |
28364e4b | 2402 | updateDenialValidationState(ne.d_validationState, ne.d_name, state, denialState, NXQTYPE, qtype == QType::DS); |
142ab370 RG |
2403 | } else { |
2404 | ne.d_validationState = state; | |
2405 | } | |
114829cc | 2406 | |
26ca3513 | 2407 | if(!wasVariable()) { |
26ca3513 | 2408 | if(qtype.getCode()) { // prevents us from blacking out a whole domain |
a712cb56 | 2409 | t_sstorage.negcache.add(ne); |
26ca3513 RG |
2410 | } |
2411 | } | |
2412 | negindic=true; | |
2413 | } | |
2414 | } | |
2415 | } | |
2416 | ||
2417 | return done; | |
2418 | } | |
2419 | ||
6dfff36f RG |
2420 | 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) |
2421 | { | |
deca7d8f | 2422 | bool chained = false; |
17cecc84 | 2423 | int resolveret = RCode::NoError; |
6dfff36f RG |
2424 | s_outqueries++; |
2425 | d_outqueries++; | |
2426 | ||
2427 | if(d_outqueries + d_throttledqueries > s_maxqperq) { | |
2428 | throw ImmediateServFailException("more than "+std::to_string(s_maxqperq)+" (max-qperq) queries sent while resolving "+qname.toLogString()); | |
2429 | } | |
2430 | ||
2431 | if(s_maxtotusec && d_totUsec > s_maxtotusec) { | |
2432 | 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"); | |
2433 | } | |
2434 | ||
2435 | if(doTCP) { | |
2436 | LOG(prefix<<qname<<": using TCP with "<< remoteIP.toStringWithPort() <<endl); | |
2437 | s_tcpoutqueries++; | |
2438 | d_tcpoutqueries++; | |
2439 | } | |
2440 | ||
2441 | if(d_pdl && d_pdl->preoutquery(remoteIP, d_requestor, qname, qtype, doTCP, lwr.d_records, resolveret)) { | |
2442 | LOG(prefix<<qname<<": query handled by Lua"<<endl); | |
2443 | } | |
2444 | else { | |
2fe3354d | 2445 | ednsmask=getEDNSSubnetMask(qname, remoteIP); |
6dfff36f RG |
2446 | if(ednsmask) { |
2447 | LOG(prefix<<qname<<": Adding EDNS Client Subnet Mask "<<ednsmask->toString()<<" to query"<<endl); | |
d6923beb | 2448 | s_ecsqueries++; |
6dfff36f RG |
2449 | } |
2450 | resolveret = asyncresolveWrapper(remoteIP, d_doDNSSEC, qname, qtype.getCode(), | |
deca7d8f | 2451 | doTCP, sendRDQuery, &d_now, ednsmask, &lwr, &chained); // <- we go out on the wire! |
6dfff36f | 2452 | if(ednsmask) { |
d6923beb | 2453 | s_ecsresponses++; |
6dfff36f RG |
2454 | LOG(prefix<<qname<<": Received EDNS Client Subnet Mask "<<ednsmask->toString()<<" on response"<<endl); |
2455 | } | |
2456 | } | |
2457 | ||
2458 | /* preoutquery killed the query by setting dq.rcode to -3 */ | |
2459 | if(resolveret==-3) { | |
2460 | throw ImmediateServFailException("Query killed by policy"); | |
2461 | } | |
2462 | ||
2463 | d_totUsec += lwr.d_usec; | |
2464 | accountAuthLatency(lwr.d_usec, remoteIP.sin4.sin_family); | |
2465 | ||
2466 | if(resolveret != 1) { | |
2467 | /* Error while resolving */ | |
2468 | if(resolveret == 0) { | |
2469 | /* Time out */ | |
2470 | ||
2471 | LOG(prefix<<qname<<": timeout resolving after "<<lwr.d_usec/1000.0<<"msec "<< (doTCP ? "over TCP" : "")<<endl); | |
2472 | d_timeouts++; | |
2473 | s_outgoingtimeouts++; | |
2474 | ||
2475 | if(remoteIP.sin4.sin_family == AF_INET) | |
2476 | s_outgoing4timeouts++; | |
2477 | else | |
2478 | s_outgoing6timeouts++; | |
be9078b3 | 2479 | |
2480 | if(t_timeouts) | |
2481 | t_timeouts->push_back(remoteIP); | |
6dfff36f RG |
2482 | } |
2483 | else if(resolveret == -2) { | |
2484 | /* OS resource limit reached */ | |
2485 | LOG(prefix<<qname<<": hit a local resource limit resolving"<< (doTCP ? " over TCP" : "")<<", probable error: "<<stringerror()<<endl); | |
2486 | g_stats.resourceLimits++; | |
2487 | } | |
2488 | else { | |
2489 | /* -1 means server unreachable */ | |
2490 | s_unreachables++; | |
2491 | d_unreachables++; | |
2492 | LOG(prefix<<qname<<": error resolving from "<<remoteIP.toString()<< (doTCP ? " over TCP" : "") <<", possible error: "<<strerror(errno)<< endl); | |
2493 | } | |
2494 | ||
deca7d8f | 2495 | if(resolveret != -2 && !chained) { // don't account for resource limits, they are our own fault |
589884b8 | 2496 | t_sstorage.nsSpeeds[nsName.empty()? DNSName(remoteIP.toStringWithPort()) : nsName].submit(remoteIP, 1000000, &d_now); // 1 sec |
6dfff36f RG |
2497 | |
2498 | // code below makes sure we don't filter COM or the root | |
2499 | if (s_serverdownmaxfails > 0 && (auth != g_rootdnsname) && t_sstorage.fails.incr(remoteIP) >= s_serverdownmaxfails) { | |
2500 | LOG(prefix<<qname<<": Max fails reached resolving on "<< remoteIP.toString() <<". Going full throttle for "<< s_serverdownthrottletime <<" seconds" <<endl); | |
2501 | // mark server as down | |
2502 | t_sstorage.throttle.throttle(d_now.tv_sec, boost::make_tuple(remoteIP, "", 0), s_serverdownthrottletime, 10000); | |
2503 | } | |
2504 | else if (resolveret == -1) { | |
2505 | // unreachable, 1 minute or 100 queries | |
2506 | t_sstorage.throttle.throttle(d_now.tv_sec, boost::make_tuple(remoteIP, qname, qtype.getCode()), 60, 100); | |
2507 | } | |
2508 | else { | |
2509 | // timeout | |
2510 | t_sstorage.throttle.throttle(d_now.tv_sec, boost::make_tuple(remoteIP, qname, qtype.getCode()), 10, 5); | |
2511 | } | |
2512 | } | |
2513 | ||
2514 | return false; | |
2515 | } | |
2516 | ||
2517 | /* we got an answer */ | |
2518 | if(lwr.d_rcode==RCode::ServFail || lwr.d_rcode==RCode::Refused) { | |
2519 | LOG(prefix<<qname<<": "<<nsName<<" ("<<remoteIP.toString()<<") returned a "<< (lwr.d_rcode==RCode::ServFail ? "ServFail" : "Refused") << ", trying sibling IP or NS"<<endl); | |
deca7d8f RG |
2520 | if (!chained) { |
2521 | t_sstorage.throttle.throttle(d_now.tv_sec, boost::make_tuple(remoteIP, qname, qtype.getCode()), 60, 3); | |
2522 | } | |
6dfff36f RG |
2523 | return false; |
2524 | } | |
2525 | ||
2526 | /* this server sent a valid answer, mark it backup up if it was down */ | |
2527 | if(s_serverdownmaxfails > 0) { | |
2528 | t_sstorage.fails.clear(remoteIP); | |
2529 | } | |
2530 | ||
2531 | if(lwr.d_tcbit) { | |
2532 | *truncated = true; | |
2533 | ||
2534 | if (doTCP) { | |
2535 | LOG(prefix<<qname<<": truncated bit set, over TCP?"<<endl); | |
2536 | /* let's treat that as a ServFail answer from this server */ | |
2537 | t_sstorage.throttle.throttle(d_now.tv_sec, boost::make_tuple(remoteIP, qname, qtype.getCode()), 60, 3); | |
2538 | return false; | |
2539 | } | |
2540 | ||
2541 | return true; | |
2542 | } | |
2543 | ||
2544 | return true; | |
2545 | } | |
2546 | ||
51b6b728 | 2547 | 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) |
6dfff36f RG |
2548 | { |
2549 | string prefix; | |
2550 | if(doLog()) { | |
2551 | prefix=d_prefix; | |
2552 | prefix.append(depth, ' '); | |
2553 | } | |
2554 | ||
2555 | if(s_minimumTTL) { | |
2556 | for(auto& rec : lwr.d_records) { | |
2557 | rec.d_ttl = max(rec.d_ttl, s_minimumTTL); | |
2558 | } | |
2559 | } | |
2560 | ||
2b984251 | 2561 | bool needWildcardProof = false; |
e4894ce0 RG |
2562 | unsigned int wildcardLabelsCount; |
2563 | *rcode = updateCacheFromRecords(depth, lwr, qname, qtype, auth, wasForwarded, ednsmask, state, needWildcardProof, wildcardLabelsCount); | |
6dfff36f RG |
2564 | if (*rcode != RCode::NoError) { |
2565 | return true; | |
2566 | } | |
2567 | ||
2568 | LOG(prefix<<qname<<": determining status after receiving this packet"<<endl); | |
2569 | ||
2570 | set<DNSName> nsset; | |
2571 | bool realreferral=false, negindic=false; | |
2572 | DNSName newauth; | |
2573 | DNSName newtarget; | |
2574 | ||
e4894ce0 | 2575 | bool done = processRecords(prefix, qname, qtype, auth, lwr, sendRDQuery, ret, nsset, newtarget, newauth, realreferral, negindic, state, needWildcardProof, wildcardLabelsCount); |
6dfff36f RG |
2576 | |
2577 | if(done){ | |
2578 | LOG(prefix<<qname<<": status=got results, this level of recursion done"<<endl); | |
5374b03b | 2579 | LOG(prefix<<qname<<": validation status is "<<vStates[state]<<endl); |
6dfff36f RG |
2580 | *rcode = RCode::NoError; |
2581 | return true; | |
2582 | } | |
2583 | ||
2584 | if(!newtarget.empty()) { | |
2585 | if(newtarget == qname) { | |
2586 | LOG(prefix<<qname<<": status=got a CNAME referral to self, returning SERVFAIL"<<endl); | |
2587 | *rcode = RCode::ServFail; | |
2588 | return true; | |
2589 | } | |
2590 | ||
2591 | if(depth > 10) { | |
2592 | LOG(prefix<<qname<<": status=got a CNAME referral, but recursing too deep, returning SERVFAIL"<<endl); | |
2593 | *rcode = RCode::ServFail; | |
2594 | return true; | |
2595 | } | |
2596 | ||
5374b03b RG |
2597 | if (qtype == QType::DS) { |
2598 | LOG(prefix<<qname<<": status=got a CNAME referral, but we are looking for a DS"<<endl); | |
6dfff36f | 2599 | |
1c39e884 RG |
2600 | if(d_doDNSSEC) |
2601 | addNXNSECS(ret, lwr.d_records); | |
2602 | ||
2603 | *rcode = RCode::NoError; | |
2604 | return true; | |
5374b03b RG |
2605 | } |
2606 | else { | |
2607 | LOG(prefix<<qname<<": status=got a CNAME referral, starting over with "<<newtarget<<endl); | |
6dfff36f | 2608 | |
5374b03b RG |
2609 | set<GetBestNSAnswer> beenthere2; |
2610 | vState cnameState = Indeterminate; | |
2611 | *rcode = doResolve(newtarget, qtype, ret, depth + 1, beenthere2, cnameState); | |
2612 | LOG(prefix<<qname<<": updating validation state for response to "<<qname<<" from "<<vStates[state]<<" with the state from the CNAME quest: "<<vStates[cnameState]<<endl); | |
2613 | updateValidationState(state, cnameState); | |
2614 | return true; | |
2615 | } | |
6dfff36f RG |
2616 | } |
2617 | ||
2618 | if(lwr.d_rcode == RCode::NXDomain) { | |
2619 | LOG(prefix<<qname<<": status=NXDOMAIN, we are done "<<(negindic ? "(have negative SOA)" : "")<<endl); | |
2620 | ||
2621 | if(d_doDNSSEC) | |
2622 | addNXNSECS(ret, lwr.d_records); | |
2623 | ||
2624 | *rcode = RCode::NXDomain; | |
2625 | return true; | |
2626 | } | |
2627 | ||
2628 | if(nsset.empty() && !lwr.d_rcode && (negindic || lwr.d_aabit || sendRDQuery)) { | |
2629 | LOG(prefix<<qname<<": status=noerror, other types may exist, but we are done "<<(negindic ? "(have negative SOA) " : "")<<(lwr.d_aabit ? "(have aa bit) " : "")<<endl); | |
2630 | ||
114829cc RG |
2631 | if(state == Secure && lwr.d_aabit && !negindic) { |
2632 | updateValidationState(state, Bogus); | |
2633 | } | |
2634 | ||
6dfff36f RG |
2635 | if(d_doDNSSEC) |
2636 | addNXNSECS(ret, lwr.d_records); | |
2637 | ||
2638 | *rcode = RCode::NoError; | |
2639 | return true; | |
2640 | } | |
2641 | ||
2642 | if(realreferral) { | |
2643 | LOG(prefix<<qname<<": status=did not resolve, got "<<(unsigned int)nsset.size()<<" NS, "); | |
6dfff36f RG |
2644 | |
2645 | nameservers.clear(); | |
2646 | for (auto const &nameserver : nsset) { | |
2647 | if (d_wantsRPZ) { | |
2648 | d_appliedPolicy = dfe.getProcessingPolicy(nameserver, d_discardedPolicies); | |
2649 | if (d_appliedPolicy.d_kind != DNSFilterEngine::PolicyKind::NoAction) { // client query needs an RPZ response | |
2650 | LOG("however "<<nameserver<<" was blocked by RPZ policy '"<<(d_appliedPolicy.d_name ? *d_appliedPolicy.d_name : "")<<"'"<<endl); | |
2651 | *rcode = -2; | |
2652 | return true; | |
2653 | } | |
2654 | } | |
2655 | nameservers.insert({nameserver, {{}, false}}); | |
2656 | } | |
2657 | LOG("looping to them"<<endl); | |
2658 | *gotNewServers = true; | |
812c3a69 | 2659 | auth=newauth; |
4d2be65d | 2660 | |
6dfff36f RG |
2661 | return false; |
2662 | } | |
2663 | ||
2664 | return false; | |
2665 | } | |
2666 | ||
b8470add PL |
2667 | /** returns: |
2668 | * -1 in case of no results | |
2669 | * -2 when a FilterEngine Policy was hit | |
2670 | * rcode otherwise | |
2671 | */ | |
fa1b87ff | 2672 | int SyncRes::doResolveAt(NsSet &nameservers, DNSName auth, bool flawedNSSet, const DNSName &qname, const QType &qtype, |
e325f20c | 2673 | vector<DNSRecord>&ret, |
51b6b728 | 2674 | unsigned int depth, set<GetBestNSAnswer>&beenthere, vState& state) |
86c152f2 | 2675 | { |
69cbdef9 | 2676 | auto luaconfsLocal = g_luaconfs.getLocal(); |
ded77b10 | 2677 | string prefix; |
77499b05 | 2678 | if(doLog()) { |
ded77b10 BH |
2679 | prefix=d_prefix; |
2680 | prefix.append(depth, ' '); | |
2681 | } | |
3ddb9247 | 2682 | |
b8470add PL |
2683 | LOG(prefix<<qname<<": Cache consultations done, have "<<(unsigned int)nameservers.size()<<" NS to contact"); |
2684 | ||
69cbdef9 | 2685 | if (nameserversBlockedByRPZ(luaconfsLocal->dfe, nameservers)) { |
26ca3513 | 2686 | return -2; |
b8470add PL |
2687 | } |
2688 | ||
2689 | LOG(endl); | |
afbe2787 BH |
2690 | |
2691 | for(;;) { // we may get more specific nameservers | |
e8b23f3b | 2692 | vector<DNSName > rnameservers = shuffleInSpeedOrder(nameservers, doLog() ? (prefix+qname.toString()+": ") : string() ); |
3ddb9247 | 2693 | |
26ca3513 RG |
2694 | for(auto tns=rnameservers.cbegin();;++tns) { |
2695 | if(tns==rnameservers.cend()) { | |
2189085d | 2696 | LOG(prefix<<qname<<": Failed to resolve via any of the "<<(unsigned int)rnameservers.size()<<" offered NS at level '"<<auth<<"'"<<endl); |
03c09afe | 2697 | if(!auth.isRoot() && flawedNSSet) { |
2189085d | 2698 | LOG(prefix<<qname<<": Ageing nameservers for level '"<<auth<<"', next query might succeed"<<endl); |
88490c03 | 2699 | |
49a699c4 | 2700 | if(t_RC->doAgeCache(d_now.tv_sec, auth, QType::NS, 10)) |
4957a608 BH |
2701 | g_stats.nsSetInvalidations++; |
2702 | } | |
2703 | return -1; | |
afbe2787 | 2704 | } |
6dfff36f | 2705 | |
b4c8789a RG |
2706 | bool cacheOnly = false; |
2707 | // this line needs to identify the 'self-resolving' behaviour | |
2708 | if(qname == *tns && (qtype.getCode() == QType::A || qtype.getCode() == QType::AAAA)) { | |
2709 | /* we might have a glue entry in cache so let's try this NS | |
2710 | but only if we have enough in the cache to know how to reach it */ | |
2711 | LOG(prefix<<qname<<": Using NS to resolve itself, but only using what we have in cache ("<<(1+tns-rnameservers.cbegin())<<"/"<<rnameservers.size()<<")"<<endl); | |
2712 | cacheOnly = true; | |
20177d1d | 2713 | } |
5605c067 | 2714 | |
996c89cc | 2715 | typedef vector<ComboAddress> remoteIPs_t; |
5605c067 | 2716 | remoteIPs_t remoteIPs; |
bfea0d0b | 2717 | remoteIPs_t::const_iterator remoteIP; |
1c21f389 | 2718 | bool pierceDontQuery=false; |
c1d73d94 | 2719 | bool sendRDQuery=false; |
376effcf | 2720 | boost::optional<Netmask> ednsmask; |
263f6a5a | 2721 | LWResult lwr; |
6dfff36f RG |
2722 | const bool wasForwarded = tns->empty() && (!nameservers[*tns].first.empty()); |
2723 | int rcode = RCode::NoError; | |
2724 | bool gotNewServers = false; | |
2725 | ||
2726 | if(tns->empty() && !wasForwarded) { | |
2189085d | 2727 | LOG(prefix<<qname<<": Domain is out-of-band"<<endl); |
e1636f82 RG |
2728 | /* setting state to indeterminate since validation is disabled for local auth zone, |
2729 | and Insecure would be misleading. */ | |
2730 | state = Indeterminate; | |
9fc36e90 | 2731 | d_wasOutOfBand = doOOBResolve(qname, qtype, lwr.d_records, depth, lwr.d_rcode); |
4957a608 BH |
2732 | lwr.d_tcbit=false; |
2733 | lwr.d_aabit=true; | |
6dfff36f RG |
2734 | |
2735 | /* we have received an answer, are we done ? */ | |
51b6b728 | 2736 | bool done = processAnswer(depth, lwr, qname, qtype, auth, false, ednsmask, sendRDQuery, nameservers, ret, luaconfsLocal->dfe, &gotNewServers, &rcode, state); |
6dfff36f RG |
2737 | if (done) { |
2738 | return rcode; | |
2739 | } | |
2740 | if (gotNewServers) { | |
2741 | break; | |
2742 | } | |
5605c067 BH |
2743 | } |
2744 | else { | |
6dfff36f | 2745 | /* if tns is empty, retrieveAddressesForNS() knows we have hardcoded servers (i.e. "forwards") */ |
b4c8789a | 2746 | remoteIPs = retrieveAddressesForNS(prefix, qname, tns, depth, beenthere, rnameservers, nameservers, sendRDQuery, pierceDontQuery, flawedNSSet, cacheOnly); |
4957a608 BH |
2747 | |
2748 | if(remoteIPs.empty()) { | |
2189085d | 2749 | LOG(prefix<<qname<<": Failed to get IP for NS "<<*tns<<", trying next if available"<<endl); |
4957a608 BH |
2750 | flawedNSSet=true; |
2751 | continue; | |
2752 | } | |
2753 | else { | |
b8470add | 2754 | bool hitPolicy{false}; |
2189085d | 2755 | LOG(prefix<<qname<<": Resolved '"<<auth<<"' NS "<<*tns<<" to: "); |
26ca3513 RG |
2756 | for(remoteIP = remoteIPs.cbegin(); remoteIP != remoteIPs.cend(); ++remoteIP) { |
2757 | if(remoteIP != remoteIPs.cbegin()) { | |
77499b05 BH |
2758 | LOG(", "); |
2759 | } | |
2760 | LOG(remoteIP->toString()); | |
69cbdef9 | 2761 | if(nameserverIPBlockedByRPZ(luaconfsLocal->dfe, *remoteIP)) { |
26ca3513 | 2762 | hitPolicy = true; |
b8470add | 2763 | } |
4957a608 | 2764 | } |
77499b05 | 2765 | LOG(endl); |
b8470add PL |
2766 | if (hitPolicy) //implies d_wantsRPZ |
2767 | return -2; | |
4957a608 BH |
2768 | } |
2769 | ||
26ca3513 | 2770 | for(remoteIP = remoteIPs.cbegin(); remoteIP != remoteIPs.cend(); ++remoteIP) { |
2189085d | 2771 | LOG(prefix<<qname<<": Trying IP "<< remoteIP->toStringWithPort() <<", asking '"<<qname<<"|"<<qtype.getName()<<"'"<<endl); |
6dfff36f | 2772 | |
26ca3513 | 2773 | if (throttledOrBlocked(prefix, *remoteIP, qname, qtype, pierceDontQuery)) { |
4957a608 BH |
2774 | continue; |
2775 | } | |
9de3e034 | 2776 | |
6dfff36f RG |
2777 | bool truncated = false; |
2778 | bool gotAnswer = doResolveAtThisIP(prefix, qname, qtype, lwr, ednsmask, auth, sendRDQuery, | |
2779 | *tns, *remoteIP, false, &truncated); | |
2780 | if (gotAnswer && truncated ) { | |
2781 | /* retry, over TCP this time */ | |
2782 | gotAnswer = doResolveAtThisIP(prefix, qname, qtype, lwr, ednsmask, auth, sendRDQuery, | |
2783 | *tns, *remoteIP, true, &truncated); | |
2784 | } | |
710af846 | 2785 | |
6dfff36f RG |
2786 | if (!gotAnswer) { |
2787 | continue; | |
2788 | } | |
352b4183 | 2789 | |
6dfff36f | 2790 | 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 | 2791 | |
6dfff36f RG |
2792 | /* // for you IPv6 fanatics :-) |
2793 | if(remoteIP->sin4.sin_family==AF_INET6) | |
2794 | lwr.d_usec/=3; | |
2795 | */ | |
2796 | // cout<<"msec: "<<lwr.d_usec/1000.0<<", "<<g_avgLatency/1000.0<<'\n'; | |
710af846 | 2797 | |
589884b8 | 2798 | t_sstorage.nsSpeeds[tns->empty()? DNSName(remoteIP->toStringWithPort()) : *tns].submit(*remoteIP, lwr.d_usec, &d_now); |
628e2c7b | 2799 | |
6dfff36f | 2800 | /* we have received an answer, are we done ? */ |
51b6b728 | 2801 | bool done = processAnswer(depth, lwr, qname, qtype, auth, wasForwarded, ednsmask, sendRDQuery, nameservers, ret, luaconfsLocal->dfe, &gotNewServers, &rcode, state); |
6dfff36f RG |
2802 | if (done) { |
2803 | return rcode; | |
4957a608 | 2804 | } |
6dfff36f RG |
2805 | if (gotNewServers) { |
2806 | break; | |
4957a608 | 2807 | } |
6dfff36f RG |
2808 | /* was lame */ |
2809 | t_sstorage.throttle.throttle(d_now.tv_sec, boost::make_tuple(*remoteIP, qname, qtype.getCode()), 60, 100); | |
4957a608 | 2810 | } |
aadceba8 | 2811 | |
6dfff36f RG |
2812 | if (gotNewServers) { |
2813 | break; | |
4957a608 | 2814 | } |
620db2c8 | 2815 | |
6dfff36f RG |
2816 | if(remoteIP == remoteIPs.cend()) // we tried all IP addresses, none worked |
2817 | continue; | |
620db2c8 | 2818 | |
86c152f2 BH |
2819 | } |
2820 | } | |
86c152f2 | 2821 | } |
ac539791 | 2822 | return -1; |
86c152f2 BH |
2823 | } |
2824 | ||
2fe3354d | 2825 | void SyncRes::setQuerySource(const ComboAddress& requestor, boost::optional<const EDNSSubnetOpts&> incomingECS) |
8a3a3822 | 2826 | { |
2fe3354d CH |
2827 | d_requestor = requestor; |
2828 | ||
2829 | if (incomingECS && incomingECS->source.getBits() > 0) { | |
2830 | d_cacheRemote = incomingECS->source.getMaskedNetwork(); | |
2831 | uint8_t bits = std::min(incomingECS->source.getBits(), (incomingECS->source.isIpv4() ? s_ecsipv4limit : s_ecsipv6limit)); | |
2832 | ComboAddress trunc = incomingECS->source.getNetwork(); | |
2833 | trunc.truncate(bits); | |
2834 | d_outgoingECSNetwork = boost::optional<Netmask>(Netmask(trunc, bits)); | |
2835 | } else { | |
2836 | d_cacheRemote = d_requestor; | |
2837 | if(!incomingECS && s_ednslocalsubnets.match(d_requestor)) { | |
2838 | ComboAddress trunc = d_requestor; | |
2839 | uint8_t bits = d_requestor.isIPv4() ? 32 : 128; | |
2840 | bits = std::min(bits, (trunc.isIPv4() ? s_ecsipv4limit : s_ecsipv6limit)); | |
2841 | trunc.truncate(bits); | |
2842 | d_outgoingECSNetwork = boost::optional<Netmask>(Netmask(trunc, bits)); | |
2843 | } else if (s_ecsScopeZero.source.getBits() > 0) { | |
8a3a3822 RG |
2844 | /* RFC7871 says we MUST NOT send any ECS if the source scope is 0. |
2845 | But using an empty ECS in that case would mean inserting | |
2846 | a non ECS-specific entry into the cache, preventing any further | |
2847 | ECS-specific query to be sent. | |
2848 | So instead we use the trick described in section 7.1.2: | |
2849 | "The subsequent Recursive Resolver query to the Authoritative Nameserver | |
2850 | will then either not include an ECS option or MAY optionally include | |
2851 | its own address information, which is what the Authoritative | |
2852 | Nameserver will almost certainly use to generate any Tailored | |
2853 | Response in lieu of an option. This allows the answer to be handled | |
2854 | by the same caching mechanism as other queries, with an explicit | |
2855 | indicator of the applicable scope. Subsequent Stub Resolver queries | |
2856 | for /0 can then be answered from this cached response. | |
2857 | */ | |
2fe3354d CH |
2858 | d_outgoingECSNetwork = boost::optional<Netmask>(s_ecsScopeZero.source.getMaskedNetwork()); |
2859 | d_cacheRemote = s_ecsScopeZero.source.getNetwork(); | |
2860 | } else { | |
2861 | // ECS disabled because no scope-zero address could be derived. | |
2862 | d_outgoingECSNetwork = boost::none; | |
8a3a3822 RG |
2863 | } |
2864 | } | |
8a3a3822 RG |
2865 | } |
2866 | ||
2fe3354d | 2867 | boost::optional<Netmask> SyncRes::getEDNSSubnetMask(const DNSName& dn, const ComboAddress& rem) |
e9f9b8ec | 2868 | { |
2fe3354d CH |
2869 | if(d_outgoingECSNetwork && (s_ednsdomains.check(dn) || s_ednsremotesubnets.match(rem))) { |
2870 | return d_outgoingECSNetwork; | |
e9f9b8ec | 2871 | } |
2fe3354d | 2872 | return boost::none; |
e9f9b8ec | 2873 | } |
bd53ea9d | 2874 | |
9065eb05 RG |
2875 | void SyncRes::parseEDNSSubnetWhitelist(const std::string& wlist) |
2876 | { | |
2877 | vector<string> parts; | |
2878 | stringtok(parts, wlist, ",; "); | |
2879 | for(const auto& a : parts) { | |
2880 | try { | |
2fe3354d | 2881 | s_ednsremotesubnets.addMask(Netmask(a)); |
9065eb05 RG |
2882 | } |
2883 | catch(...) { | |
2884 | s_ednsdomains.add(DNSName(a)); | |
2885 | } | |
2886 | } | |
2887 | } | |
2888 | ||
2fe3354d CH |
2889 | void SyncRes::parseEDNSSubnetAddFor(const std::string& subnetlist) |
2890 | { | |
2891 | vector<string> parts; | |
2892 | stringtok(parts, subnetlist, ",; "); | |
2893 | for(const auto& a : parts) { | |
2894 | s_ednslocalsubnets.addMask(a); | |
2895 | } | |
2896 | } | |
2897 | ||
8ce79a22 | 2898 | // used by PowerDNSLua - note that this neglects to add the packet count & statistics back to pdns_ercursor.cc |
a3e7b735 | 2899 | int directResolve(const DNSName& qname, const QType& qtype, int qclass, vector<DNSRecord>& ret) |
bd53ea9d PD |
2900 | { |
2901 | struct timeval now; | |
2902 | gettimeofday(&now, 0); | |
710af846 | 2903 | |
bd53ea9d | 2904 | SyncRes sr(now); |
a3e7b735 | 2905 | int res = sr.beginResolve(qname, QType(qtype), qclass, ret); |
e325f20c | 2906 | |
bd53ea9d PD |
2907 | return res; |
2908 | } | |
30ee601a | 2909 | |
30ee601a RG |
2910 | int SyncRes::getRootNS(struct timeval now, asyncresolve_t asyncCallback) { |
2911 | SyncRes sr(now); | |
2912 | sr.setDoEDNS0(true); | |
0b29b9c5 | 2913 | sr.setUpdatingRootNS(); |
30ee601a | 2914 | sr.setDoDNSSEC(g_dnssecmode != DNSSECMode::Off); |
0c43f455 | 2915 | sr.setDNSSECValidationRequested(g_dnssecmode != DNSSECMode::Off && g_dnssecmode != DNSSECMode::ProcessNoValidate); |
30ee601a RG |
2916 | sr.setAsyncCallback(asyncCallback); |
2917 | ||
2918 | vector<DNSRecord> ret; | |
2919 | int res=-1; | |
2920 | try { | |
2921 | res=sr.beginResolve(g_rootdnsname, QType(QType::NS), 1, ret); | |
2922 | if (g_dnssecmode != DNSSECMode::Off && g_dnssecmode != DNSSECMode::ProcessNoValidate) { | |
4d2be65d | 2923 | auto state = sr.getValidationState(); |
30ee601a RG |
2924 | if (state == Bogus) |
2925 | throw PDNSException("Got Bogus validation result for .|NS"); | |
2926 | } | |
2927 | return res; | |
2928 | } | |
c78ceb39 | 2929 | catch(const PDNSException& e) { |
e6a9dde5 | 2930 | g_log<<Logger::Error<<"Failed to update . records, got an exception: "<<e.reason<<endl; |
30ee601a | 2931 | } |
c78ceb39 | 2932 | catch(const ImmediateServFailException& e) { |
e6a9dde5 | 2933 | g_log<<Logger::Error<<"Failed to update . records, got an exception: "<<e.reason<<endl; |
c78ceb39 RG |
2934 | } |
2935 | catch(const std::exception& e) { | |
e6a9dde5 | 2936 | g_log<<Logger::Error<<"Failed to update . records, got an exception: "<<e.what()<<endl; |
30ee601a | 2937 | } |
c78ceb39 | 2938 | catch(...) { |
e6a9dde5 | 2939 | g_log<<Logger::Error<<"Failed to update . records, got an exception"<<endl; |
30ee601a | 2940 | } |
c78ceb39 | 2941 | |
30ee601a | 2942 | if(!res) { |
e6a9dde5 | 2943 | g_log<<Logger::Notice<<"Refreshed . records"<<endl; |
30ee601a RG |
2944 | } |
2945 | else | |
e6a9dde5 | 2946 | g_log<<Logger::Error<<"Failed to update . records, RCODE="<<res<<endl; |
c78ceb39 | 2947 | |
30ee601a RG |
2948 | return res; |
2949 | } |