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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; | |
123da0f8 | 50 | const std::unordered_set<uint16_t> SyncRes::s_redirectionQTypes = {QType::CNAME, QType::DNAME}; |
3337c2f7 | 51 | |
a9af3782 | 52 | unsigned int SyncRes::s_maxnegttl; |
b9473937 | 53 | unsigned int SyncRes::s_maxbogusttl; |
c3e753c7 | 54 | unsigned int SyncRes::s_maxcachettl; |
3337c2f7 RG |
55 | unsigned int SyncRes::s_maxqperq; |
56 | unsigned int SyncRes::s_maxtotusec; | |
57 | unsigned int SyncRes::s_maxdepth; | |
58 | unsigned int SyncRes::s_minimumTTL; | |
5cf4b2e7 | 59 | unsigned int SyncRes::s_minimumECSTTL; |
1051f8a9 BH |
60 | unsigned int SyncRes::s_packetcachettl; |
61 | unsigned int SyncRes::s_packetcacheservfailttl; | |
628e2c7b PA |
62 | unsigned int SyncRes::s_serverdownmaxfails; |
63 | unsigned int SyncRes::s_serverdownthrottletime; | |
e7861cc4 | 64 | unsigned int SyncRes::s_ecscachelimitttl; |
e9a628a2 | 65 | std::atomic<uint64_t> SyncRes::s_authzonequeries; |
aebb81e4 | 66 | std::atomic<uint64_t> SyncRes::s_queries; |
67 | std::atomic<uint64_t> SyncRes::s_outgoingtimeouts; | |
68 | std::atomic<uint64_t> SyncRes::s_outgoing4timeouts; | |
69 | std::atomic<uint64_t> SyncRes::s_outgoing6timeouts; | |
70 | std::atomic<uint64_t> SyncRes::s_outqueries; | |
71 | std::atomic<uint64_t> SyncRes::s_tcpoutqueries; | |
72 | std::atomic<uint64_t> SyncRes::s_throttledqueries; | |
73 | std::atomic<uint64_t> SyncRes::s_dontqueries; | |
c701672a | 74 | std::atomic<uint64_t> SyncRes::s_qnameminfallbacksuccess; |
aebb81e4 | 75 | std::atomic<uint64_t> SyncRes::s_nodelegated; |
76 | std::atomic<uint64_t> SyncRes::s_unreachables; | |
d6923beb | 77 | std::atomic<uint64_t> SyncRes::s_ecsqueries; |
78 | std::atomic<uint64_t> SyncRes::s_ecsresponses; | |
c9783016 RG |
79 | std::map<uint8_t, std::atomic<uint64_t>> SyncRes::s_ecsResponsesBySubnetSize4; |
80 | std::map<uint8_t, std::atomic<uint64_t>> SyncRes::s_ecsResponsesBySubnetSize6; | |
81 | ||
e9f9b8ec RG |
82 | uint8_t SyncRes::s_ecsipv4limit; |
83 | uint8_t SyncRes::s_ecsipv6limit; | |
fd8898fb | 84 | uint8_t SyncRes::s_ecsipv4cachelimit; |
85 | uint8_t SyncRes::s_ecsipv6cachelimit; | |
ed9019c9 | 86 | |
996c89cc | 87 | bool SyncRes::s_doIPv6; |
1051f8a9 | 88 | bool SyncRes::s_nopacketcache; |
01402d56 | 89 | bool SyncRes::s_rootNXTrust; |
3337c2f7 | 90 | bool SyncRes::s_noEDNS; |
116d1288 | 91 | bool SyncRes::s_qnameminimization; |
d40a915b | 92 | SyncRes::HardenNXD SyncRes::s_hardenNXD; |
c836dc19 | 93 | |
e6a9dde5 | 94 | #define LOG(x) if(d_lm == Log) { g_log <<Logger::Warning << x; } else if(d_lm == Store) { d_trace << x; } |
728485ca | 95 | |
69cbdef9 | 96 | static void accountAuthLatency(int usec, int family) |
11adfdd3 | 97 | { |
7b75810e | 98 | if(family == AF_INET) { |
99 | if(usec < 1000) | |
100 | g_stats.auth4Answers0_1++; | |
101 | else if(usec < 10000) | |
102 | g_stats.auth4Answers1_10++; | |
103 | else if(usec < 100000) | |
104 | g_stats.auth4Answers10_100++; | |
105 | else if(usec < 1000000) | |
106 | g_stats.auth4Answers100_1000++; | |
107 | else | |
108 | g_stats.auth4AnswersSlow++; | |
109 | } else { | |
110 | if(usec < 1000) | |
111 | g_stats.auth6Answers0_1++; | |
112 | else if(usec < 10000) | |
113 | g_stats.auth6Answers1_10++; | |
114 | else if(usec < 100000) | |
115 | g_stats.auth6Answers10_100++; | |
116 | else if(usec < 1000000) | |
117 | g_stats.auth6Answers100_1000++; | |
118 | else | |
119 | g_stats.auth6AnswersSlow++; | |
120 | } | |
121 | ||
11adfdd3 | 122 | } |
123 | ||
4465e941 | 124 | |
14d9aade | 125 | 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 | 126 | d_totUsec(0), d_now(now), |
116d1288 OM |
127 | d_cacheonly(false), d_doDNSSEC(false), d_doEDNS0(false), d_qNameMinimization(s_qnameminimization), d_lm(s_lm) |
128 | ||
129 | { | |
ac0e821b BH |
130 | } |
131 | ||
728485ca | 132 | /** everything begins here - this is the entry point just after receiving a packet */ |
e325f20c | 133 | int SyncRes::beginResolve(const DNSName &qname, const QType &qtype, uint16_t qclass, vector<DNSRecord>&ret) |
728485ca | 134 | { |
4d2be65d | 135 | vState state = Indeterminate; |
c836dc19 | 136 | s_queries++; |
3762e821 | 137 | d_wasVariable=false; |
9fc36e90 | 138 | d_wasOutOfBand=false; |
710af846 | 139 | |
4d2be65d | 140 | if (doSpecialNamesResolve(qname, qtype, qclass, ret)) { |
d04ac108 | 141 | d_queryValidationState = Insecure; // this could fool our stats into thinking a validation took place |
142 | return 0; // so do check before updating counters (we do now) | |
4d2be65d | 143 | } |
db50a7f4 | 144 | |
25e654f7 RG |
145 | auto qtypeCode = qtype.getCode(); |
146 | /* rfc6895 section 3.1 */ | |
147 | if ((qtypeCode >= 128 && qtypeCode <= 254) || qtypeCode == QType::RRSIG || qtypeCode == QType::NSEC3 || qtypeCode == QType::OPT || qtypeCode == 65535) { | |
693dbe65 | 148 | return -1; |
3f8a73d6 | 149 | } |
710af846 | 150 | |
db50a7f4 PL |
151 | if(qclass==QClass::ANY) |
152 | qclass=QClass::IN; | |
153 | else if(qclass!=QClass::IN) | |
154 | return -1; | |
8171ab83 | 155 | |
db50a7f4 | 156 | set<GetBestNSAnswer> beenthere; |
51b6b728 | 157 | int res=doResolve(qname, qtype, ret, 0, beenthere, state); |
4d2be65d | 158 | d_queryValidationState = state; |
0c43f455 | 159 | |
e1636f82 | 160 | if (shouldValidate()) { |
3b54c577 | 161 | if (d_queryValidationState != Indeterminate) { |
162 | g_stats.dnssecValidations++; | |
163 | } | |
0c43f455 RG |
164 | increaseDNSSECStateCounter(d_queryValidationState); |
165 | } | |
166 | ||
db50a7f4 PL |
167 | return res; |
168 | } | |
169 | ||
170 | /*! Handles all special, built-in names | |
171 | * Fills ret with an answer and returns true if it handled the query. | |
172 | * | |
d03c1b70 | 173 | * Handles the following queries (and their ANY variants): |
db50a7f4 PL |
174 | * |
175 | * - localhost. IN A | |
176 | * - localhost. IN AAAA | |
177 | * - 1.0.0.127.in-addr.arpa. IN PTR | |
178 | * - 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 | |
179 | * - version.bind. CH TXT | |
180 | * - version.pdns. CH TXT | |
181 | * - id.server. CH TXT | |
c1d92d73 | 182 | * - trustanchor.server CH TXT |
0b7de4d7 | 183 | * - negativetrustanchor.server CH TXT |
db50a7f4 | 184 | */ |
6dfff36f | 185 | bool SyncRes::doSpecialNamesResolve(const DNSName &qname, const QType &qtype, const uint16_t qclass, vector<DNSRecord> &ret) |
db50a7f4 PL |
186 | { |
187 | 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."), | |
0b7de4d7 PL |
188 | localhost("localhost."), versionbind("version.bind."), idserver("id.server."), versionpdns("version.pdns."), trustanchorserver("trustanchor.server."), |
189 | negativetrustanchorserver("negativetrustanchor.server."); | |
db50a7f4 PL |
190 | |
191 | bool handled = false; | |
d03c1b70 | 192 | vector<pair<QType::typeenum, string> > answers; |
db50a7f4 | 193 | |
d03c1b70 PL |
194 | if ((qname == arpa || qname == ip6_arpa) && |
195 | qclass == QClass::IN) { | |
db50a7f4 | 196 | handled = true; |
d03c1b70 PL |
197 | if (qtype == QType::PTR || qtype == QType::ANY) |
198 | answers.push_back({QType::PTR, "localhost."}); | |
db50a7f4 PL |
199 | } |
200 | ||
d03c1b70 PL |
201 | if (qname == localhost && |
202 | qclass == QClass::IN) { | |
db50a7f4 | 203 | handled = true; |
d03c1b70 PL |
204 | if (qtype == QType::A || qtype == QType::ANY) |
205 | answers.push_back({QType::A, "127.0.0.1"}); | |
206 | if (qtype == QType::AAAA || qtype == QType::ANY) | |
207 | answers.push_back({QType::AAAA, "::1"}); | |
db50a7f4 PL |
208 | } |
209 | ||
d03c1b70 PL |
210 | if ((qname == versionbind || qname == idserver || qname == versionpdns) && |
211 | qclass == QClass::CHAOS) { | |
db50a7f4 | 212 | handled = true; |
d03c1b70 PL |
213 | if (qtype == QType::TXT || qtype == QType::ANY) { |
214 | if(qname == versionbind || qname == versionpdns) | |
215 | answers.push_back({QType::TXT, "\""+::arg()["version-string"]+"\""}); | |
950626be | 216 | else if (s_serverID != "disabled") |
d03c1b70 PL |
217 | answers.push_back({QType::TXT, "\""+s_serverID+"\""}); |
218 | } | |
31ad43ab BH |
219 | } |
220 | ||
c1d92d73 PL |
221 | if (qname == trustanchorserver && qclass == QClass::CHAOS && |
222 | ::arg().mustDo("allow-trust-anchor-query")) { | |
223 | handled = true; | |
224 | if (qtype == QType::TXT || qtype == QType::ANY) { | |
225 | auto luaLocal = g_luaconfs.getLocal(); | |
226 | for (auto const &dsAnchor : luaLocal->dsAnchors) { | |
227 | ostringstream ans; | |
228 | ans<<"\""; | |
229 | ans<<dsAnchor.first.toString(); // Explicit toString to have a trailing dot | |
230 | for (auto const &dsRecord : dsAnchor.second) { | |
231 | ans<<" "; | |
232 | ans<<dsRecord.d_tag; | |
233 | } | |
234 | ans << "\""; | |
235 | answers.push_back({QType::TXT, ans.str()}); | |
236 | } | |
237 | } | |
238 | } | |
239 | ||
0b7de4d7 PL |
240 | if (qname == negativetrustanchorserver && qclass == QClass::CHAOS && |
241 | ::arg().mustDo("allow-trust-anchor-query")) { | |
242 | handled = true; | |
243 | if (qtype == QType::TXT || qtype == QType::ANY) { | |
244 | auto luaLocal = g_luaconfs.getLocal(); | |
245 | for (auto const &negAnchor : luaLocal->negAnchors) { | |
246 | ostringstream ans; | |
247 | ans<<"\""; | |
248 | ans<<negAnchor.first.toString(); // Explicit toString to have a trailing dot | |
249 | if (negAnchor.second.length()) | |
250 | ans<<" "<<negAnchor.second; | |
251 | ans << "\""; | |
252 | answers.push_back({QType::TXT, ans.str()}); | |
253 | } | |
254 | } | |
255 | } | |
256 | ||
d03c1b70 | 257 | if (handled && !answers.empty()) { |
a9af3782 | 258 | ret.clear(); |
db50a7f4 PL |
259 | d_wasOutOfBand=true; |
260 | ||
e325f20c | 261 | DNSRecord dr; |
db50a7f4 | 262 | dr.d_name = qname; |
e693ff5a | 263 | dr.d_place = DNSResourceRecord::ANSWER; |
db50a7f4 PL |
264 | dr.d_class = qclass; |
265 | dr.d_ttl = 86400; | |
d03c1b70 PL |
266 | for (const auto& ans : answers) { |
267 | dr.d_type = ans.first; | |
6177a176 | 268 | dr.d_content = DNSRecordContent::mastermake(ans.first, qclass, ans.second); |
d03c1b70 PL |
269 | ret.push_back(dr); |
270 | } | |
a9af3782 | 271 | } |
710af846 | 272 | |
db50a7f4 | 273 | return handled; |
728485ca | 274 | } |
afbe2787 | 275 | |
db50a7f4 | 276 | |
ab5c053d | 277 | //! This is the 'out of band resolver', in other words, the authoritative server |
3337c2f7 | 278 | void SyncRes::AuthDomain::addSOA(std::vector<DNSRecord>& records) const |
e93c956b | 279 | { |
3337c2f7 RG |
280 | SyncRes::AuthDomain::records_t::const_iterator ziter = d_records.find(boost::make_tuple(getName(), QType::SOA)); |
281 | if (ziter != d_records.end()) { | |
282 | DNSRecord dr = *ziter; | |
283 | dr.d_place = DNSResourceRecord::AUTHORITY; | |
284 | records.push_back(dr); | |
5605c067 | 285 | } |
3337c2f7 RG |
286 | else { |
287 | // cerr<<qname<<": can't find SOA record '"<<getName()<<"' in our zone!"<<endl; | |
288 | } | |
289 | } | |
5605c067 | 290 | |
3337c2f7 RG |
291 | int SyncRes::AuthDomain::getRecords(const DNSName& qname, uint16_t qtype, std::vector<DNSRecord>& records) const |
292 | { | |
293 | int result = RCode::NoError; | |
294 | records.clear(); | |
5605c067 | 295 | |
3337c2f7 RG |
296 | // partial lookup |
297 | std::pair<records_t::const_iterator,records_t::const_iterator> range = d_records.equal_range(tie(qname)); | |
298 | ||
299 | SyncRes::AuthDomain::records_t::const_iterator ziter; | |
300 | bool somedata = false; | |
301 | ||
302 | for(ziter = range.first; ziter != range.second; ++ziter) { | |
303 | somedata = true; | |
304 | ||
305 | if(qtype == QType::ANY || ziter->d_type == qtype || ziter->d_type == QType::CNAME) { | |
306 | // let rest of nameserver do the legwork on this one | |
307 | records.push_back(*ziter); | |
308 | } | |
309 | else if (ziter->d_type == QType::NS && ziter->d_name.countLabels() > getName().countLabels()) { | |
310 | // we hit a delegation point! | |
311 | DNSRecord dr = *ziter; | |
39eb8051 | 312 | dr.d_place=DNSResourceRecord::AUTHORITY; |
3337c2f7 | 313 | records.push_back(dr); |
39eb8051 | 314 | } |
5605c067 | 315 | } |
3337c2f7 RG |
316 | |
317 | if (!records.empty()) { | |
318 | /* We have found an exact match, we're done */ | |
319 | // cerr<<qname<<": exact match in zone '"<<getName()<<"'"<<endl; | |
320 | return result; | |
5605c067 | 321 | } |
3337c2f7 RG |
322 | |
323 | if (somedata) { | |
324 | /* We have records for that name, but not of the wanted qtype */ | |
325 | // cerr<<qname<<": found record in '"<<getName()<<"', but nothing of the right type, sending SOA"<<endl; | |
326 | addSOA(records); | |
327 | ||
328 | return result; | |
9e9844e2 | 329 | } |
5605c067 | 330 | |
3337c2f7 | 331 | // cerr<<qname<<": nothing found so far in '"<<getName()<<"', trying wildcards"<<endl; |
c5c066bf | 332 | DNSName wcarddomain(qname); |
3337c2f7 RG |
333 | while(wcarddomain != getName() && wcarddomain.chopOff()) { |
334 | // cerr<<qname<<": trying '*."<<wcarddomain<<"' in "<<getName()<<endl; | |
335 | range = d_records.equal_range(boost::make_tuple(g_wildcarddnsname + wcarddomain)); | |
336 | if (range.first==range.second) | |
0d1e259a BH |
337 | continue; |
338 | ||
3337c2f7 RG |
339 | for(ziter = range.first; ziter != range.second; ++ziter) { |
340 | DNSRecord dr = *ziter; | |
0f05b02b | 341 | // if we hit a CNAME, just answer that - rest of recursor will do the needful & follow |
3337c2f7 | 342 | if(dr.d_type == qtype || qtype == QType::ANY || dr.d_type == QType::CNAME) { |
e325f20c | 343 | dr.d_name = qname; |
3337c2f7 RG |
344 | dr.d_place = DNSResourceRecord::ANSWER; |
345 | records.push_back(dr); | |
0d1e259a BH |
346 | } |
347 | } | |
3337c2f7 RG |
348 | |
349 | if (records.empty()) { | |
350 | addSOA(records); | |
351 | } | |
352 | ||
353 | // cerr<<qname<<": in '"<<getName()<<"', had wildcard match on '*."<<wcarddomain<<"'"<<endl; | |
354 | return result; | |
0d1e259a BH |
355 | } |
356 | ||
3337c2f7 | 357 | /* Nothing for this name, no wildcard, let's see if there is some NS */ |
c5c066bf | 358 | DNSName nsdomain(qname); |
3337c2f7 RG |
359 | while (nsdomain.chopOff() && nsdomain != getName()) { |
360 | range = d_records.equal_range(boost::make_tuple(nsdomain,QType::NS)); | |
361 | if(range.first == range.second) | |
5605c067 BH |
362 | continue; |
363 | ||
3337c2f7 RG |
364 | for(ziter = range.first; ziter != range.second; ++ziter) { |
365 | DNSRecord dr = *ziter; | |
366 | dr.d_place = DNSResourceRecord::AUTHORITY; | |
367 | records.push_back(dr); | |
5605c067 BH |
368 | } |
369 | } | |
3337c2f7 RG |
370 | |
371 | if(records.empty()) { | |
372 | // cerr<<qname<<": no NS match in zone '"<<getName()<<"' either, handing out SOA"<<endl; | |
373 | addSOA(records); | |
374 | result = RCode::NXDomain; | |
5605c067 | 375 | } |
5605c067 | 376 | |
3337c2f7 RG |
377 | return result; |
378 | } | |
379 | ||
f7b8cffa | 380 | bool SyncRes::doOOBResolve(const AuthDomain& domain, const DNSName &qname, const QType &qtype, vector<DNSRecord>&ret, int& res) |
3337c2f7 | 381 | { |
f7b8cffa | 382 | d_authzonequeries++; |
e9a628a2 | 383 | s_authzonequeries++; |
f7b8cffa | 384 | |
3337c2f7 | 385 | res = domain.getRecords(qname, qtype.getCode(), ret); |
9e9844e2 | 386 | return true; |
e93c956b BH |
387 | } |
388 | ||
3337c2f7 RG |
389 | bool SyncRes::doOOBResolve(const DNSName &qname, const QType &qtype, vector<DNSRecord>&ret, unsigned int depth, int& res) |
390 | { | |
391 | string prefix; | |
392 | if(doLog()) { | |
393 | prefix=d_prefix; | |
394 | prefix.append(depth, ' '); | |
395 | } | |
396 | ||
397 | DNSName authdomain(qname); | |
398 | domainmap_t::const_iterator iter=getBestAuthZone(&authdomain); | |
399 | if(iter==t_sstorage.domainmap->end() || !iter->second.isAuth()) { | |
400 | LOG(prefix<<qname<<": auth storage has no zone for this query!"<<endl); | |
401 | return false; | |
402 | } | |
403 | ||
404 | LOG(prefix<<qname<<": auth storage has data, zone='"<<authdomain<<"'"<<endl); | |
405 | return doOOBResolve(iter->second, qname, qtype, ret, res); | |
406 | } | |
407 | ||
8949a3e0 OM |
408 | bool SyncRes::isForwardOrAuth(const DNSName &qname) const { |
409 | DNSName authname(qname); | |
410 | domainmap_t::const_iterator iter = getBestAuthZone(&authname); | |
411 | return iter != t_sstorage.domainmap->end(); | |
412 | } | |
413 | ||
addde5c1 | 414 | uint64_t SyncRes::doEDNSDump(int fd) |
ff1872cf | 415 | { |
5e1f23ca | 416 | auto fp = std::unique_ptr<FILE, int(*)(FILE*)>(fdopen(dup(fd), "w"), fclose); |
a82f68f0 | 417 | if (!fp) { |
addde5c1 | 418 | return 0; |
a82f68f0 | 419 | } |
addde5c1 | 420 | uint64_t count = 0; |
421 | ||
5e1f23ca | 422 | fprintf(fp.get(),"; edns from thread follows\n;\n"); |
a712cb56 | 423 | for(const auto& eds : t_sstorage.ednsstatus) { |
addde5c1 | 424 | count++; |
f0dbdd62 OM |
425 | char tmp[26]; |
426 | fprintf(fp.get(), "%s\t%d\t%s", eds.first.toString().c_str(), (int)eds.second.mode, ctime_r(&eds.second.modeSetAt, tmp)); | |
ff1872cf | 427 | } |
addde5c1 | 428 | return count; |
ff1872cf BH |
429 | } |
430 | ||
9065eb05 RG |
431 | uint64_t SyncRes::doDumpNSSpeeds(int fd) |
432 | { | |
5e1f23ca | 433 | auto fp = std::unique_ptr<FILE, int(*)(FILE*)>(fdopen(dup(fd), "w"), fclose); |
9065eb05 RG |
434 | if(!fp) |
435 | return 0; | |
5e1f23ca | 436 | fprintf(fp.get(), "; nsspeed dump from thread follows\n;\n"); |
9065eb05 RG |
437 | uint64_t count=0; |
438 | ||
a712cb56 | 439 | for(const auto& i : t_sstorage.nsSpeeds) |
9065eb05 RG |
440 | { |
441 | count++; | |
a2d65f83 | 442 | |
443 | // an <empty> can appear hear in case of authoritative (hosted) zones | |
5e1f23ca | 444 | fprintf(fp.get(), "%s -> ", i.first.toLogString().c_str()); |
9065eb05 RG |
445 | for(const auto& j : i.second.d_collection) |
446 | { | |
447 | // typedef vector<pair<ComboAddress, DecayingEwma> > collection_t; | |
5e1f23ca | 448 | fprintf(fp.get(), "%s/%f ", j.first.toString().c_str(), j.second.peek()); |
9065eb05 | 449 | } |
5e1f23ca | 450 | fprintf(fp.get(), "\n"); |
9065eb05 | 451 | } |
9065eb05 RG |
452 | return count; |
453 | } | |
454 | ||
c1e20fba | 455 | uint64_t SyncRes::doDumpThrottleMap(int fd) |
456 | { | |
5e1f23ca | 457 | auto fp = std::unique_ptr<FILE, int(*)(FILE*)>(fdopen(dup(fd), "w"), fclose); |
c1e20fba | 458 | if(!fp) |
459 | return 0; | |
5e1f23ca RG |
460 | fprintf(fp.get(), "; throttle map dump follows\n"); |
461 | fprintf(fp.get(), "; remote IP\tqname\tqtype\tcount\tttd\n"); | |
c1e20fba | 462 | uint64_t count=0; |
463 | ||
96e2f64f | 464 | const auto& throttleMap = t_sstorage.throttle.getThrottleMap(); |
465 | for(const auto& i : throttleMap) | |
c1e20fba | 466 | { |
467 | count++; | |
f0dbdd62 | 468 | char tmp[26]; |
96e2f64f | 469 | // remote IP, dns name, qtype, count, ttd |
f0dbdd62 | 470 | fprintf(fp.get(), "%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_r(&i.second.ttd, tmp)); |
c1e20fba | 471 | } |
5e1f23ca | 472 | |
c1e20fba | 473 | return count; |
474 | } | |
475 | ||
60e5208a OM |
476 | uint64_t SyncRes::doDumpFailedServers(int fd) |
477 | { | |
478 | auto fp = std::unique_ptr<FILE, int(*)(FILE*)>(fdopen(dup(fd), "w"), fclose); | |
479 | if(!fp) | |
480 | return 0; | |
481 | fprintf(fp.get(), "; failed servers dump follows\n"); | |
482 | fprintf(fp.get(), "; remote IP\tcount\ttimestamp\n"); | |
483 | uint64_t count=0; | |
484 | ||
485 | for(const auto& i : t_sstorage.fails.getMap()) | |
486 | { | |
487 | count++; | |
488 | char tmp[26]; | |
489 | ctime_r(&i.second.last, tmp); | |
490 | fprintf(fp.get(), "%s\t%lld\t%s", i.first.toString().c_str(), | |
491 | static_cast<long long>(i.second.value), tmp); | |
492 | } | |
493 | ||
494 | return count; | |
495 | } | |
496 | ||
9d534f2a | 497 | /* so here is the story. First we complete the full resolution process for a domain name. And only THEN do we decide |
498 | to also do DNSSEC validation, which leads to new queries. To make this simple, we *always* ask for DNSSEC records | |
499 | so that if there are RRSIGs for a name, we'll have them. | |
500 | ||
501 | However, some hosts simply can't answer questions which ask for DNSSEC. This can manifest itself as: | |
502 | * No answer | |
503 | * FormErr | |
504 | * Nonsense answer | |
505 | ||
506 | The cause of "No answer" may be fragmentation, and it is tempting to probe if smaller answers would get through. | |
507 | Another cause of "No answer" may simply be a network condition. | |
508 | Nonsense answers are a clearer indication this host won't be able to do DNSSEC evah. | |
509 | ||
510 | Previous implementations have suffered from turning off DNSSEC questions for an authoritative server based on timeouts. | |
511 | A clever idea is to only turn off DNSSEC if we know a domain isn't signed anyhow. The problem with that really | |
512 | clever idea however is that at this point in PowerDNS, we may simply not know that yet. All the DNSSEC thinking happens | |
513 | elsewhere. It may not have happened yet. | |
514 | ||
515 | For now this means we can't be clever, but will turn off DNSSEC if you reply with FormError or gibberish. | |
516 | */ | |
517 | ||
6de48f75 | 518 | int SyncRes::asyncresolveWrapper(const ComboAddress& ip, bool ednsMANDATORY, const DNSName& domain, const DNSName& auth, int type, bool doTCP, bool sendRDQuery, struct timeval* now, boost::optional<Netmask>& srcmask, LWResult* res, bool* chained) const |
81883dcc BH |
519 | { |
520 | /* what is your QUEST? | |
57769f13 | 521 | the goal is to get as many remotes as possible on the highest level of EDNS support |
81883dcc BH |
522 | The levels are: |
523 | ||
81883dcc | 524 | 0) UNKNOWN Unknown state |
57769f13 | 525 | 1) EDNS: Honors EDNS0 |
526 | 2) EDNSIGNORANT: Ignores EDNS0, gives replies without EDNS0 | |
269ac73d | 527 | 3) NOEDNS: Generates FORMERR on EDNS queries |
81883dcc BH |
528 | |
529 | Everybody starts out assumed to be '0'. | |
57769f13 | 530 | If '0', send out EDNS0 |
531 | If you FORMERR us, go to '3', | |
532 | If no EDNS in response, go to '2' | |
533 | If '1', send out EDNS0 | |
534 | If FORMERR, downgrade to 3 | |
535 | If '2', keep on including EDNS0, see what happens | |
81883dcc | 536 | Same behaviour as 0 |
57769f13 | 537 | If '3', send bare queries |
81883dcc BH |
538 | */ |
539 | ||
90e8ea71 | 540 | SyncRes::EDNSStatus* ednsstatus = &t_sstorage.ednsstatus[ip]; // does this include port? YES |
81883dcc | 541 | |
90e8ea71 OM |
542 | if (ednsstatus->modeSetAt && ednsstatus->modeSetAt + 3600 < d_now.tv_sec) { |
543 | *ednsstatus = SyncRes::EDNSStatus(); | |
77499b05 | 544 | // cerr<<"Resetting EDNS Status for "<<ip.toString()<<endl); |
81883dcc BH |
545 | } |
546 | ||
90e8ea71 OM |
547 | SyncRes::EDNSStatus::EDNSMode *mode = &ednsstatus->mode; |
548 | SyncRes::EDNSStatus::EDNSMode oldmode = *mode; | |
fe61f5d8 | 549 | int EDNSLevel = 0; |
4898a348 RG |
550 | auto luaconfsLocal = g_luaconfs.getLocal(); |
551 | ResolveContext ctx; | |
552 | #ifdef HAVE_PROTOBUF | |
553 | ctx.d_initialRequestId = d_initialRequestId; | |
554 | #endif | |
6de48f75 OM |
555 | #ifdef HAVE_FSTRM |
556 | ctx.d_auth = auth; | |
557 | #endif | |
81883dcc BH |
558 | |
559 | int ret; | |
ff1872cf | 560 | for(int tries = 0; tries < 3; ++tries) { |
e325f20c | 561 | // cerr<<"Remote '"<<ip.toString()<<"' currently in mode "<<mode<<endl; |
57769f13 | 562 | |
90e8ea71 | 563 | if (*mode == EDNSStatus::NOEDNS) { |
81883dcc | 564 | g_stats.noEdnsOutQueries++; |
9d534f2a | 565 | EDNSLevel = 0; // level != mode |
81883dcc | 566 | } |
90e8ea71 | 567 | else if (ednsMANDATORY || *mode == EDNSStatus::UNKNOWN || *mode == EDNSStatus::EDNSOK || *mode == EDNSStatus::EDNSIGNORANT) |
9d534f2a | 568 | EDNSLevel = 1; |
30ee601a | 569 | |
c1c29961 PL |
570 | DNSName sendQname(domain); |
571 | if (g_lowercaseOutgoing) | |
572 | sendQname.makeUsLowerCase(); | |
573 | ||
30ee601a | 574 | if (d_asyncResolve) { |
0bd2e252 | 575 | ret = d_asyncResolve(ip, sendQname, type, doTCP, sendRDQuery, EDNSLevel, now, srcmask, ctx, res, chained); |
30ee601a RG |
576 | } |
577 | else { | |
b9fa43e0 | 578 | ret=asyncresolve(ip, sendQname, type, doTCP, sendRDQuery, EDNSLevel, now, srcmask, ctx, d_outgoingProtobufServers, d_frameStreamServers, luaconfsLocal->outgoingProtobufExportConfig.exportTypes, res, chained); |
30ee601a | 579 | } |
90e8ea71 OM |
580 | // ednsstatus might be cleared, so do a new lookup |
581 | ednsstatus = &t_sstorage.ednsstatus[ip]; // does this include port? YES | |
582 | mode = &ednsstatus->mode; | |
9d534f2a | 583 | if(ret < 0) { |
584 | return ret; // transport error, nothing to learn here | |
585 | } | |
57769f13 | 586 | |
9d534f2a | 587 | if(ret == 0) { // timeout, not doing anything with it now |
81883dcc BH |
588 | return ret; |
589 | } | |
90e8ea71 | 590 | else if (*mode == EDNSStatus::UNKNOWN || *mode == EDNSStatus::EDNSOK || *mode == EDNSStatus::EDNSIGNORANT ) { |
27ae17df | 591 | if(res->d_validpacket && !res->d_haveEDNS && res->d_rcode == RCode::FormErr) { |
2189085d | 592 | // cerr<<"Downgrading to NOEDNS because of "<<RCode::to_s(res->d_rcode)<<" for query to "<<ip.toString()<<" for '"<<domain<<"'"<<endl; |
90e8ea71 | 593 | *mode = EDNSStatus::NOEDNS; |
4957a608 | 594 | continue; |
81883dcc | 595 | } |
81883dcc | 596 | else if(!res->d_haveEDNS) { |
90e8ea71 OM |
597 | if (*mode != EDNSStatus::EDNSIGNORANT) { |
598 | *mode = EDNSStatus::EDNSIGNORANT; | |
269ac73d | 599 | // cerr<<"We find that "<<ip.toString()<<" is an EDNS-ignorer for '"<<domain<<"', moving to mode 2"<<endl; |
57769f13 | 600 | } |
81883dcc | 601 | } |
57769f13 | 602 | else { |
90e8ea71 | 603 | *mode = EDNSStatus::EDNSOK; |
e325f20c | 604 | // cerr<<"We find that "<<ip.toString()<<" is EDNS OK!"<<endl; |
81883dcc | 605 | } |
57769f13 | 606 | |
81883dcc | 607 | } |
90e8ea71 | 608 | if (oldmode != *mode || !ednsstatus->modeSetAt) |
bb4bdbaf | 609 | ednsstatus->modeSetAt=d_now.tv_sec; |
e325f20c | 610 | // cerr<<"Result: ret="<<ret<<", EDNS-level: "<<EDNSLevel<<", haveEDNS: "<<res->d_haveEDNS<<", new mode: "<<mode<<endl; |
81883dcc BH |
611 | return ret; |
612 | } | |
613 | return ret; | |
614 | } | |
615 | ||
116d1288 OM |
616 | #define QLOG(x) LOG(prefix << " child=" << child << ": " << x << endl) |
617 | ||
618 | int SyncRes::doResolve(const DNSName &qname, const QType &qtype, vector<DNSRecord>&ret, unsigned int depth, set<GetBestNSAnswer>& beenthere, vState& state) { | |
619 | ||
8949a3e0 | 620 | if (!getQNameMinimization() || isForwardOrAuth(qname)) { |
116d1288 OM |
621 | return doResolveNoQNameMinimization(qname, qtype, ret, depth, beenthere, state); |
622 | } | |
623 | ||
624 | // The qname minimization algorithm is a simplified version of the one in RFC 7816 (bis). | |
625 | // It could be simplified because the cache maintenance (both positive and negative) | |
626 | // is already done by doResolveNoQNameMinimization(). | |
627 | // | |
628 | // Sketch of algorithm: | |
629 | // Check cache | |
630 | // If result found: done | |
631 | // Otherwise determine closes ancestor from cache data | |
632 | // Repeat querying A, adding more labels of the original qname | |
633 | // If we get a delegation continue at ancestor determination | |
634 | // Until we have the full name. | |
635 | // | |
636 | // The algorithm starts with adding a single label per iteration, and | |
637 | // moves to three labels per iteration after three iterations. | |
638 | ||
639 | DNSName child; | |
640 | string prefix = d_prefix; | |
641 | prefix.append(depth, ' '); | |
642 | prefix.append(string("QM ") + qname.toString() + "|" + qtype.getName()); | |
643 | ||
644 | QLOG("doResolve"); | |
645 | ||
646 | // Look in cache only | |
647 | vector<DNSRecord> retq; | |
648 | bool old = setCacheOnly(true); | |
649 | bool fromCache = false; | |
650 | int res = doResolveNoQNameMinimization(qname, qtype, retq, depth + 1, beenthere, state, &fromCache); | |
651 | setCacheOnly(old); | |
652 | if (fromCache) { | |
653 | QLOG("Step0 Found in cache"); | |
654 | ret.insert(ret.end(), retq.begin(), retq.end()); | |
655 | return res; | |
656 | } | |
657 | QLOG("Step0 Not cached"); | |
658 | ||
659 | const unsigned int qnamelen = qname.countLabels(); | |
660 | ||
661 | for (unsigned int i = 0; i <= qnamelen; ) { | |
662 | ||
663 | // Step 1 | |
664 | vector<DNSRecord> bestns; | |
665 | // the two retries allow getBestNSFromCache&co to reprime the root | |
666 | // hints, in case they ever go missing | |
667 | for (int tries = 0; tries < 2 && bestns.empty(); ++tries) { | |
668 | bool flawedNSSet = false; | |
669 | set<GetBestNSAnswer> beenthereIgnored; | |
670 | getBestNSFromCache(qname, qtype, bestns, &flawedNSSet, depth + 1, beenthereIgnored); | |
671 | } | |
239c8386 OM |
672 | |
673 | if (bestns.size() == 0) { | |
674 | // Something terrible is wrong | |
116d1288 OM |
675 | QLOG("Step1 No ancestor found return ServFail"); |
676 | return RCode::ServFail; | |
677 | } | |
678 | ||
239c8386 OM |
679 | const DNSName& ancestor(bestns[0].d_name); |
680 | QLOG("Step1 Ancestor from cache is " << ancestor.toString()); | |
116d1288 OM |
681 | child = ancestor; |
682 | ||
683 | unsigned int targetlen = std::min(child.countLabels() + (i > 3 ? 3 : 1), qnamelen); | |
684 | ||
685 | for (; i <= qnamelen; i++) { | |
686 | // Step 2 | |
687 | while (child.countLabels() < targetlen) { | |
688 | child.prependRawLabel(qname.getRawLabel(qnamelen - child.countLabels() - 1)); | |
689 | } | |
690 | targetlen += i > 3 ? 3 : 1; | |
691 | targetlen = std::min(targetlen, qnamelen); | |
692 | ||
693 | QLOG("Step2 New child"); | |
694 | ||
695 | // Step 3 resolve | |
696 | if (child == qname) { | |
697 | QLOG("Step3 Going to do final resolve"); | |
698 | res = doResolveNoQNameMinimization(qname, qtype, ret, depth + 1, beenthere, state); | |
239c8386 | 699 | QLOG("Step3 Final resolve: " << RCode::to_s(res) << "/" << ret.size()); |
116d1288 OM |
700 | return res; |
701 | } | |
702 | ||
703 | // Step 6 | |
704 | QLOG("Step4 Resolve A for child"); | |
705 | retq.resize(0); | |
706 | StopAtDelegation stopAtDelegation = Stop; | |
707 | res = doResolveNoQNameMinimization(child, QType::A, retq, depth + 1, beenthere, state, NULL, &stopAtDelegation); | |
708 | QLOG("Step4 Resolve A result is " << RCode::to_s(res) << "/" << retq.size() << "/" << stopAtDelegation); | |
709 | if (stopAtDelegation == Stopped) { | |
710 | QLOG("Delegation seen, continue at step 1"); | |
711 | break; | |
712 | } | |
713 | if (res != RCode::NoError) { | |
714 | // Case 5: unexpected answer | |
715 | QLOG("Step5: other rcode, last effort final resolve"); | |
716 | setQNameMinimization(false); | |
717 | res = doResolveNoQNameMinimization(qname, qtype, ret, depth + 1, beenthere, state); | |
c701672a | 718 | |
719 | if(res == RCode::NoError) { | |
720 | s_qnameminfallbacksuccess++; | |
721 | } | |
722 | ||
239c8386 | 723 | QLOG("Step5 End resolve: " << RCode::to_s(res) << "/" << ret.size()); |
116d1288 OM |
724 | return res; |
725 | } | |
726 | } | |
727 | } | |
728 | ||
729 | // Should not be reached | |
730 | QLOG("Max iterations reached, return ServFail"); | |
731 | return RCode::ServFail; | |
732 | } | |
733 | ||
b88526ce PL |
734 | /*! This function will check the cache and go out to the internet if the answer is not in cache |
735 | * | |
736 | * \param qname The name we need an answer for | |
737 | * \param qtype | |
738 | * \param ret The vector of DNSRecords we need to fill with the answers | |
739 | * \param depth The recursion depth we are in | |
740 | * \param beenthere | |
239c8386 OM |
741 | * \param fromCache tells the caller the result came from the cache, may be nullptr |
742 | * \param stopAtDelegation if non-nullptr and pointed-to value is Stop requests the callee to stop at a delegation, if so pointed-to value is set to Stopped | |
b88526ce PL |
743 | * \return DNS RCODE or -1 (Error) or -2 (RPZ hit) |
744 | */ | |
116d1288 | 745 | int SyncRes::doResolveNoQNameMinimization(const DNSName &qname, const QType &qtype, vector<DNSRecord>&ret, unsigned int depth, set<GetBestNSAnswer>& beenthere, vState& state, bool *fromCache, StopAtDelegation *stopAtDelegation) |
afbe2787 | 746 | { |
ded77b10 | 747 | string prefix; |
77499b05 | 748 | if(doLog()) { |
ded77b10 BH |
749 | prefix=d_prefix; |
750 | prefix.append(depth, ' '); | |
751 | } | |
b8470add | 752 | |
4d2be65d RG |
753 | LOG(prefix<<qname<<": Wants "<< (d_doDNSSEC ? "" : "NO ") << "DNSSEC processing, "<<(d_requireAuthData ? "" : "NO ")<<"auth data in query for "<<qtype.getName()<<endl); |
754 | ||
755 | state = Indeterminate; | |
710af846 | 756 | |
7c3398aa RG |
757 | if(s_maxdepth && depth > s_maxdepth) |
758 | throw ImmediateServFailException("More than "+std::to_string(s_maxdepth)+" (max-recursion-depth) levels of recursion needed while resolving "+qname.toLogString()); | |
759 | ||
f4df5e89 | 760 | int res=0; |
b88526ce PL |
761 | |
762 | // This is a difficult way of expressing "this is a normal query", i.e. not getRootNS. | |
0b29b9c5 | 763 | if(!(d_updatingRootNS && qtype.getCode()==QType::NS && qname.isRoot())) { |
115d07ad | 764 | if(d_cacheonly) { // very limited OOB support |
263f6a5a | 765 | LWResult lwr; |
2189085d | 766 | LOG(prefix<<qname<<": Recursion not requested for '"<<qname<<"|"<<qtype.getName()<<"', peeking at auth/forward zones"<<endl); |
c5c066bf | 767 | DNSName authname(qname); |
115d07ad | 768 | domainmap_t::const_iterator iter=getBestAuthZone(&authname); |
a712cb56 | 769 | if(iter != t_sstorage.domainmap->end()) { |
3337c2f7 | 770 | if(iter->second.isAuth()) { |
4957a608 | 771 | ret.clear(); |
9fc36e90 | 772 | d_wasOutOfBand = doOOBResolve(qname, qtype, ret, depth, res); |
116d1288 OM |
773 | if (fromCache) |
774 | *fromCache = d_wasOutOfBand; | |
4957a608 BH |
775 | return res; |
776 | } | |
777 | else { | |
3337c2f7 | 778 | const vector<ComboAddress>& servers = iter->second.d_servers; |
4957a608 | 779 | const ComboAddress remoteIP = servers.front(); |
2189085d | 780 | LOG(prefix<<qname<<": forwarding query to hardcoded nameserver '"<< remoteIP.toStringWithPort()<<"' for zone '"<<authname<<"'"<<endl); |
4957a608 | 781 | |
6148fa97 | 782 | boost::optional<Netmask> nm; |
deca7d8f | 783 | bool chained = false; |
6de48f75 | 784 | res=asyncresolveWrapper(remoteIP, d_doDNSSEC, qname, authname, qtype.getCode(), false, false, &d_now, nm, &lwr, &chained); |
fabef7e0 | 785 | |
786 | d_totUsec += lwr.d_usec; | |
787 | accountAuthLatency(lwr.d_usec, remoteIP.sin4.sin_family); | |
116d1288 OM |
788 | if (fromCache) |
789 | *fromCache = true; | |
790 | ||
4957a608 | 791 | // filter out the good stuff from lwr.result() |
ab33a095 RG |
792 | if (res == 1) { |
793 | for(const auto& rec : lwr.d_records) { | |
794 | if(rec.d_place == DNSResourceRecord::ANSWER) | |
795 | ret.push_back(rec); | |
796 | } | |
797 | return 0; | |
798 | } | |
799 | else { | |
800 | return RCode::ServFail; | |
4957a608 | 801 | } |
4957a608 | 802 | } |
115d07ad BH |
803 | } |
804 | } | |
805 | ||
e1636f82 RG |
806 | DNSName authname(qname); |
807 | bool wasForwardedOrAuthZone = false; | |
808 | bool wasAuthZone = false; | |
ad797d94 | 809 | bool wasForwardRecurse = false; |
e1636f82 RG |
810 | domainmap_t::const_iterator iter = getBestAuthZone(&authname); |
811 | if(iter != t_sstorage.domainmap->end()) { | |
ad797d94 | 812 | const auto& domain = iter->second; |
e1636f82 | 813 | wasForwardedOrAuthZone = true; |
ad797d94 RG |
814 | |
815 | if (domain.isAuth()) { | |
e1636f82 | 816 | wasAuthZone = true; |
ad797d94 RG |
817 | } else if (domain.shouldRecurse()) { |
818 | wasForwardRecurse = true; | |
e1636f82 RG |
819 | } |
820 | } | |
821 | ||
ad797d94 | 822 | if(!d_skipCNAMECheck && doCNAMECacheCheck(qname, qtype, ret, depth, res, state, wasAuthZone, wasForwardRecurse)) { // will reroute us if needed |
e1636f82 | 823 | d_wasOutOfBand = wasAuthZone; |
c836dc19 | 824 | return res; |
e1636f82 | 825 | } |
710af846 | 826 | |
ad797d94 | 827 | if(doCacheCheck(qname, authname, wasForwardedOrAuthZone, wasAuthZone, wasForwardRecurse, qtype, ret, depth, res, state)) { |
e1636f82 RG |
828 | // we done |
829 | d_wasOutOfBand = wasAuthZone; | |
116d1288 OM |
830 | if (fromCache) |
831 | *fromCache = true; | |
c836dc19 | 832 | return res; |
e1636f82 | 833 | } |
c836dc19 | 834 | } |
afbe2787 | 835 | |
115d07ad | 836 | if(d_cacheonly) |
c836dc19 | 837 | return 0; |
728485ca | 838 | |
2189085d | 839 | LOG(prefix<<qname<<": No cache hit for '"<<qname<<"|"<<qtype.getName()<<"', trying to find an appropriate NS record"<<endl); |
710af846 | 840 | |
c5c066bf | 841 | DNSName subdomain(qname); |
d8049162 | 842 | if(qtype == QType::DS) subdomain.chopOff(); |
728485ca | 843 | |
fa1b87ff | 844 | NsSet nsset; |
7305df82 | 845 | bool flawedNSSet=false; |
97df07f8 | 846 | |
3cef03e9 RG |
847 | /* we use subdomain here instead of qname because for DS queries we only care about the state of the parent zone */ |
848 | computeZoneCuts(subdomain, g_rootdnsname, depth); | |
70b3fe7a | 849 | |
97df07f8 PD |
850 | // the two retries allow getBestNSNamesFromCache&co to reprime the root |
851 | // hints, in case they ever go missing | |
bdf40704 | 852 | for(int tries=0;tries<2 && nsset.empty();++tries) { |
891fbf88 | 853 | subdomain=getBestNSNamesFromCache(subdomain, qtype, nsset, &flawedNSSet, depth, beenthere); // pass beenthere to both occasions |
bdf40704 BH |
854 | } |
855 | ||
5374b03b | 856 | state = getValidationStatus(qname, false); |
70b3fe7a | 857 | |
5374b03b | 858 | LOG(prefix<<qname<<": initial validation status for "<<qname<<" is "<<vStates[state]<<endl); |
4d2be65d | 859 | |
116d1288 | 860 | if(!(res=doResolveAt(nsset, subdomain, flawedNSSet, qname, qtype, ret, depth, beenthere, state, stopAtDelegation))) |
728485ca | 861 | return 0; |
3ddb9247 | 862 | |
2189085d | 863 | LOG(prefix<<qname<<": failed (res="<<res<<")"<<endl); |
b8470add PL |
864 | |
865 | if (res == -2) | |
866 | return res; | |
867 | ||
20177d1d | 868 | return res<0 ? RCode::ServFail : res; |
afbe2787 BH |
869 | } |
870 | ||
c2567ad1 | 871 | #if 0 |
a67dd0cf | 872 | // for testing purposes |
fdf05fd4 BH |
873 | static bool ipv6First(const ComboAddress& a, const ComboAddress& b) |
874 | { | |
875 | return !(a.sin4.sin_family < a.sin4.sin_family); | |
876 | } | |
c2567ad1 | 877 | #endif |
fdf05fd4 | 878 | |
0e4675a9 RG |
879 | struct speedOrderCA |
880 | { | |
881 | speedOrderCA(std::map<ComboAddress,double>& speeds): d_speeds(speeds) {} | |
882 | bool operator()(const ComboAddress& a, const ComboAddress& b) const | |
883 | { | |
884 | return d_speeds[a] < d_speeds[b]; | |
885 | } | |
886 | std::map<ComboAddress, double>& d_speeds; | |
887 | }; | |
888 | ||
21f0f88b | 889 | /** This function explicitly goes out for A or AAAA addresses |
996c89cc | 890 | */ |
b4c8789a | 891 | vector<ComboAddress> SyncRes::getAddrs(const DNSName &qname, unsigned int depth, set<GetBestNSAnswer>& beenthere, bool cacheOnly) |
75b49099 | 892 | { |
e325f20c | 893 | typedef vector<DNSRecord> res_t; |
996c89cc BH |
894 | typedef vector<ComboAddress> ret_t; |
895 | ret_t ret; | |
75b49099 | 896 | |
116d1288 | 897 | bool oldCacheOnly = setCacheOnly(cacheOnly); |
24bb9b58 | 898 | bool oldRequireAuthData = d_requireAuthData; |
5597f804 | 899 | bool oldValidationRequested = d_DNSSECValidationRequested; |
24bb9b58 | 900 | d_requireAuthData = false; |
5597f804 | 901 | d_DNSSECValidationRequested = false; |
92011b8f | 902 | |
d11e155d | 903 | vState newState = Indeterminate; |
b84ce13e | 904 | res_t resv4; |
d11e155d | 905 | // If IPv4 ever becomes second class, we should revisit this |
b84ce13e | 906 | if (doResolve(qname, QType::A, resv4, depth+1, beenthere, newState) == 0) { // this consults cache, OR goes out |
dcdcbe7d OM |
907 | for (auto const &i : resv4) { |
908 | if (i.d_type == QType::A) { | |
909 | if (auto rec = getRR<ARecordContent>(i)) { | |
d11e155d | 910 | ret.push_back(rec->getCA(53)); |
d96e88da | 911 | } |
42724edf | 912 | } |
f4df5e89 | 913 | } |
493f5682 OM |
914 | } |
915 | if (s_doIPv6) { | |
916 | if (ret.empty()) { | |
917 | // We did not find IPv4 addresses, try to get IPv6 ones | |
b84ce13e OM |
918 | newState = Indeterminate; |
919 | res_t resv6; | |
920 | if (doResolve(qname, QType::AAAA, resv6, depth+1, beenthere, newState) == 0) { // this consults cache, OR goes out | |
dcdcbe7d OM |
921 | for (const auto &i : resv6) { |
922 | if (i.d_type == QType::AAAA) { | |
923 | if (auto rec = getRR<AAAARecordContent>(i)) | |
493f5682 OM |
924 | ret.push_back(rec->getCA(53)); |
925 | } | |
926 | } | |
927 | } | |
928 | } else { | |
929 | // We have some IPv4 records, don't bother with going out to get IPv6, but do consult the cache | |
930 | // Once IPv6 adoption matters, this needs to be revisited | |
931 | res_t cset; | |
932 | if (t_RC->get(d_now.tv_sec, qname, QType(QType::AAAA), false, &cset, d_cacheRemote) > 0) { | |
dcdcbe7d OM |
933 | for (const auto &i : cset) { |
934 | if (i.d_ttl > (unsigned int)d_now.tv_sec ) { | |
935 | if (auto rec = getRR<AAAARecordContent>(i)) { | |
493f5682 OM |
936 | ret.push_back(rec->getCA(53)); |
937 | } | |
938 | } | |
939 | } | |
60c9a54f | 940 | } |
60c9a54f | 941 | } |
bfea0d0b | 942 | } |
710af846 | 943 | |
24bb9b58 | 944 | d_requireAuthData = oldRequireAuthData; |
5597f804 | 945 | d_DNSSECValidationRequested = oldValidationRequested; |
116d1288 | 946 | setCacheOnly(oldCacheOnly); |
24bb9b58 | 947 | |
c767798a RG |
948 | /* we need to remove from the nsSpeeds collection the existing IPs |
949 | for this nameserver that are no longer in the set, even if there | |
950 | is only one or none at all in the current set. | |
951 | */ | |
952 | map<ComboAddress, double> speeds; | |
953 | auto& collection = t_sstorage.nsSpeeds[qname].d_collection; | |
954 | for(const auto& val: ret) { | |
7881a640 | 955 | speeds[val] = collection[val].get(&d_now); |
c767798a | 956 | } |
996c89cc | 957 | |
c767798a | 958 | t_sstorage.nsSpeeds[qname].purge(speeds); |
996c89cc | 959 | |
c767798a | 960 | if(ret.size() > 1) { |
feccaf7f | 961 | random_shuffle(ret.begin(), ret.end()); |
0e4675a9 RG |
962 | speedOrderCA so(speeds); |
963 | stable_sort(ret.begin(), ret.end(), so); | |
964 | ||
965 | if(doLog()) { | |
966 | string prefix=d_prefix; | |
967 | prefix.append(depth, ' '); | |
968 | LOG(prefix<<"Nameserver "<<qname<<" IPs: "); | |
969 | bool first = true; | |
970 | for(const auto& addr : ret) { | |
971 | if (first) { | |
972 | first = false; | |
4957a608 | 973 | } |
0e4675a9 RG |
974 | else { |
975 | LOG(", "); | |
976 | } | |
977 | LOG((addr.toString())<<"(" << (boost::format("%0.2f") % (speeds[addr]/1000.0)).str() <<"ms)"); | |
996c89cc | 978 | } |
0e4675a9 RG |
979 | LOG(endl); |
980 | } | |
996c89cc | 981 | } |
fdf05fd4 | 982 | |
728485ca | 983 | return ret; |
75b49099 BH |
984 | } |
985 | ||
7c3398aa | 986 | void SyncRes::getBestNSFromCache(const DNSName &qname, const QType& qtype, vector<DNSRecord>& bestns, bool* flawedNSSet, unsigned int depth, set<GetBestNSAnswer>& beenthere) |
86c152f2 | 987 | { |
c5c066bf PD |
988 | string prefix; |
989 | DNSName subdomain(qname); | |
77499b05 | 990 | if(doLog()) { |
ded77b10 BH |
991 | prefix=d_prefix; |
992 | prefix.append(depth, ' '); | |
993 | } | |
75b49099 | 994 | bestns.clear(); |
2b1b4054 | 995 | bool brokeloop; |
75b49099 | 996 | do { |
2b1b4054 | 997 | brokeloop=false; |
2189085d | 998 | LOG(prefix<<qname<<": Checking if we have NS in cache for '"<<subdomain<<"'"<<endl); |
e325f20c | 999 | vector<DNSRecord> ns; |
7305df82 | 1000 | *flawedNSSet = false; |
4d2be65d | 1001 | |
2fe3354d | 1002 | if(t_RC->get(d_now.tv_sec, subdomain, QType(QType::NS), false, &ns, d_cacheRemote) > 0) { |
feccaf7f RG |
1003 | bestns.reserve(ns.size()); |
1004 | ||
e325f20c | 1005 | for(auto k=ns.cbegin();k!=ns.cend(); ++k) { |
1006 | if(k->d_ttl > (unsigned int)d_now.tv_sec ) { | |
1007 | vector<DNSRecord> aset; | |
4957a608 | 1008 | |
e325f20c | 1009 | const DNSRecord& dr=*k; |
ba3c54cb RG |
1010 | auto nrr = getRR<NSRecordContent>(dr); |
1011 | if(nrr && (!nrr->getNS().isPartOf(subdomain) || t_RC->get(d_now.tv_sec, nrr->getNS(), s_doIPv6 ? QType(QType::ADDR) : QType(QType::A), | |
2fe3354d | 1012 | false, doLog() ? &aset : 0, d_cacheRemote) > 5)) { |
e325f20c | 1013 | bestns.push_back(dr); |
2189085d PL |
1014 | LOG(prefix<<qname<<": NS (with ip, or non-glue) in cache for '"<<subdomain<<"' -> '"<<nrr->getNS()<<"'"<<endl); |
1015 | LOG(prefix<<qname<<": within bailiwick: "<< nrr->getNS().isPartOf(subdomain)); | |
4957a608 | 1016 | if(!aset.empty()) { |
e325f20c | 1017 | LOG(", in cache, ttl="<<(unsigned int)(((time_t)aset.begin()->d_ttl- d_now.tv_sec ))<<endl); |
4957a608 BH |
1018 | } |
1019 | else { | |
77499b05 | 1020 | LOG(", not in cache / did not look at cache"<<endl); |
4957a608 BH |
1021 | } |
1022 | } | |
1023 | else { | |
1024 | *flawedNSSet=true; | |
e325f20c | 1025 | LOG(prefix<<qname<<": NS in cache for '"<<subdomain<<"', but needs glue ("<<nrr->getNS()<<") which we miss or is expired"<<endl); |
4957a608 BH |
1026 | } |
1027 | } | |
afbe2787 | 1028 | } |
4d2be65d | 1029 | |
75b49099 | 1030 | if(!bestns.empty()) { |
4957a608 | 1031 | GetBestNSAnswer answer; |
891fbf88 | 1032 | answer.qname=qname; |
1033 | answer.qtype=qtype.getCode(); | |
38c2ba02 RG |
1034 | for(const auto& dr : bestns) { |
1035 | if (auto nsContent = getRR<NSRecordContent>(dr)) { | |
1036 | answer.bestns.insert(make_pair(dr.d_name, nsContent->getNS())); | |
1037 | } | |
1038 | } | |
891fbf88 | 1039 | |
6493dfc0 RG |
1040 | auto insertionPair = beenthere.insert(std::move(answer)); |
1041 | if(!insertionPair.second) { | |
2b1b4054 | 1042 | brokeloop=true; |
2189085d | 1043 | LOG(prefix<<qname<<": We have NS in cache for '"<<subdomain<<"' but part of LOOP (already seen "<<answer.qname<<")! Trying less specific NS"<<endl); |
e325f20c | 1044 | ; |
77499b05 BH |
1045 | if(doLog()) |
1046 | for( set<GetBestNSAnswer>::const_iterator j=beenthere.begin();j!=beenthere.end();++j) { | |
6493dfc0 | 1047 | bool neo = (j == insertionPair.first); |
2189085d | 1048 | LOG(prefix<<qname<<": beenthere"<<(neo?"*":"")<<": "<<j->qname<<"|"<<DNSRecordContent::NumberToType(j->qtype)<<" ("<<(unsigned int)j->bestns.size()<<")"<<endl); |
77499b05 | 1049 | } |
4957a608 BH |
1050 | bestns.clear(); |
1051 | } | |
1052 | else { | |
2189085d | 1053 | LOG(prefix<<qname<<": We have NS in cache for '"<<subdomain<<"' (flawedNSSet="<<*flawedNSSet<<")"<<endl); |
4957a608 BH |
1054 | return; |
1055 | } | |
75b49099 | 1056 | } |
afbe2787 | 1057 | } |
2189085d | 1058 | LOG(prefix<<qname<<": no valid/useful NS in cache for '"<<subdomain<<"'"<<endl); |
4d2be65d | 1059 | |
52683ca3 | 1060 | if(subdomain.isRoot() && !brokeloop) { |
7836f7b4 | 1061 | // We lost the root NS records |
3ddb9247 | 1062 | primeHints(); |
159b1242 | 1063 | primeRootNSZones(g_dnssecmode != DNSSECMode::Off); |
2189085d | 1064 | LOG(prefix<<qname<<": reprimed the root"<<endl); |
0b29b9c5 RG |
1065 | /* let's prevent an infinite loop */ |
1066 | if (!d_updatingRootNS) { | |
1067 | getRootNS(d_now, d_asyncResolve); | |
1068 | } | |
6576051d | 1069 | } |
4d2be65d | 1070 | } while(subdomain.chopOff()); |
75b49099 BH |
1071 | } |
1072 | ||
69cbdef9 | 1073 | SyncRes::domainmap_t::const_iterator SyncRes::getBestAuthZone(DNSName* qname) const |
5605c067 | 1074 | { |
6493dfc0 RG |
1075 | if (t_sstorage.domainmap->empty()) { |
1076 | return t_sstorage.domainmap->end(); | |
1077 | } | |
1078 | ||
5605c067 BH |
1079 | SyncRes::domainmap_t::const_iterator ret; |
1080 | do { | |
a712cb56 RG |
1081 | ret=t_sstorage.domainmap->find(*qname); |
1082 | if(ret!=t_sstorage.domainmap->end()) | |
5605c067 | 1083 | break; |
c5c066bf | 1084 | }while(qname->chopOff()); |
5605c067 BH |
1085 | return ret; |
1086 | } | |
288f4aa9 | 1087 | |
7bf26383 | 1088 | /** doesn't actually do the work, leaves that to getBestNSFromCache */ |
7c3398aa | 1089 | DNSName SyncRes::getBestNSNamesFromCache(const DNSName &qname, const QType& qtype, NsSet& nsset, bool* flawedNSSet, unsigned int depth, set<GetBestNSAnswer>&beenthere) |
75b49099 | 1090 | { |
c5c066bf | 1091 | DNSName authdomain(qname); |
3ddb9247 | 1092 | |
5605c067 | 1093 | domainmap_t::const_iterator iter=getBestAuthZone(&authdomain); |
a712cb56 | 1094 | if(iter!=t_sstorage.domainmap->end()) { |
3337c2f7 | 1095 | if( iter->second.isAuth() ) |
fa1b87ff PL |
1096 | // this gets picked up in doResolveAt, the empty DNSName, combined with the |
1097 | // empty vector means 'we are auth for this zone' | |
1098 | nsset.insert({DNSName(), {{}, false}}); | |
2e5ae2b2 | 1099 | else { |
fa1b87ff PL |
1100 | // Again, picked up in doResolveAt. An empty DNSName, combined with a |
1101 | // non-empty vector of ComboAddresses means 'this is a forwarded domain' | |
6dfff36f | 1102 | // This is actually picked up in retrieveAddressesForNS called from doResolveAt. |
3337c2f7 | 1103 | nsset.insert({DNSName(), {iter->second.d_servers, iter->second.shouldRecurse() }}); |
2e5ae2b2 | 1104 | } |
5605c067 BH |
1105 | return authdomain; |
1106 | } | |
1107 | ||
6493dfc0 | 1108 | DNSName subdomain(qname); |
e325f20c | 1109 | vector<DNSRecord> bestns; |
891fbf88 | 1110 | getBestNSFromCache(subdomain, qtype, bestns, flawedNSSet, depth, beenthere); |
75b49099 | 1111 | |
e325f20c | 1112 | for(auto k=bestns.cbegin() ; k != bestns.cend(); ++k) { |
fa1b87ff | 1113 | // The actual resolver code will not even look at the ComboAddress or bool |
38c2ba02 RG |
1114 | const auto nsContent = getRR<NSRecordContent>(*k); |
1115 | if (nsContent) { | |
1116 | nsset.insert({nsContent->getNS(), {{}, false}}); | |
1117 | if(k==bestns.cbegin()) | |
1118 | subdomain=k->d_name; | |
1119 | } | |
86c152f2 | 1120 | } |
75b49099 | 1121 | return subdomain; |
afbe2787 BH |
1122 | } |
1123 | ||
b9473937 RG |
1124 | void SyncRes::updateValidationStatusInCache(const DNSName &qname, const QType& qt, bool aa, vState newState) const |
1125 | { | |
1126 | if (newState == Bogus) { | |
1127 | t_RC->updateValidationStatus(d_now.tv_sec, qname, qt, d_cacheRemote, aa, newState, s_maxbogusttl + d_now.tv_sec); | |
1128 | } | |
1129 | else { | |
1130 | t_RC->updateValidationStatus(d_now.tv_sec, qname, qt, d_cacheRemote, aa, newState, boost::none); | |
1131 | } | |
1132 | } | |
1133 | ||
ad797d94 | 1134 | bool SyncRes::doCNAMECacheCheck(const DNSName &qname, const QType &qtype, vector<DNSRecord>& ret, unsigned int depth, int &res, vState& state, bool wasAuthZone, bool wasForwardRecurse) |
afbe2787 | 1135 | { |
ded77b10 | 1136 | string prefix; |
77499b05 | 1137 | if(doLog()) { |
710af846 | 1138 | prefix=d_prefix; |
ded77b10 BH |
1139 | prefix.append(depth, ' '); |
1140 | } | |
36f5e3db | 1141 | |
40de2910 | 1142 | if((depth>9 && d_outqueries>10 && d_throttledqueries>5) || depth > 15) { |
2189085d | 1143 | LOG(prefix<<qname<<": recursing (CNAME or other indirection) too deep, depth="<<depth<<endl); |
c6644fc5 BH |
1144 | res=RCode::ServFail; |
1145 | return true; | |
1146 | } | |
3ddb9247 | 1147 | |
e325f20c | 1148 | vector<DNSRecord> cset; |
1f77f479 | 1149 | vector<std::shared_ptr<RRSIGRecordContent>> signatures; |
2b984251 | 1150 | vector<std::shared_ptr<DNSRecord>> authorityRecs; |
428f41b7 | 1151 | bool wasAuth; |
b9473937 | 1152 | uint32_t capTTL = std::numeric_limits<uint32_t>::max(); |
d30b5493 PL |
1153 | DNSName foundName; |
1154 | QType foundQT = QType(0); // 0 == QTYPE::ENT | |
1155 | ||
e686a798 | 1156 | LOG(prefix<<qname<<": Looking for CNAME cache hit of '"<<qname<<"|CNAME"<<"'"<<endl); |
ad797d94 | 1157 | /* we don't require auth data for forward-recurse lookups */ |
e686a798 PL |
1158 | 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) { |
1159 | foundName = qname; | |
1160 | foundQT = QType(QType::CNAME); | |
1161 | } | |
1162 | ||
1163 | if (foundName.empty() && qname != g_rootdnsname) { | |
d30b5493 PL |
1164 | // look for a DNAME cache hit |
1165 | auto labels = qname.getRawLabels(); | |
1166 | DNSName dnameName(g_rootdnsname); | |
1167 | ||
adbd867b | 1168 | LOG(prefix<<qname<<": Looking for DNAME cache hit of '"<<qname<<"|DNAME' or its ancestors"<<endl); |
d30b5493 PL |
1169 | do { |
1170 | dnameName.prependRawLabel(labels.back()); | |
1171 | labels.pop_back(); | |
71e9cc53 PL |
1172 | if (dnameName == qname && qtype != QType::DNAME) { // The client does not want a DNAME, but we've reached the QNAME already. So there is no match |
1173 | break; | |
1174 | } | |
d30b5493 | 1175 | if (t_RC->get(d_now.tv_sec, dnameName, QType(QType::DNAME), !wasForwardRecurse && d_requireAuthData, &cset, d_cacheRemote, d_doDNSSEC ? &signatures : nullptr, d_doDNSSEC ? &authorityRecs : nullptr, &d_wasVariable, &state, &wasAuth) > 0) { |
71e9cc53 PL |
1176 | foundName = dnameName; |
1177 | foundQT = QType(QType::DNAME); | |
1178 | break; | |
d30b5493 PL |
1179 | } |
1180 | } while(!labels.empty()); | |
1181 | } | |
36c5ee42 | 1182 | |
8d11c508 PL |
1183 | if (foundName.empty()) { |
1184 | LOG(prefix<<qname<<": No CNAME or DNAME cache hit of '"<< qname <<"' found"<<endl); | |
1185 | return false; | |
1186 | } | |
1187 | ||
0de8295b PL |
1188 | for(auto const &record : cset) { |
1189 | if (record.d_class != QClass::IN) { | |
8d11c508 PL |
1190 | continue; |
1191 | } | |
c5310862 | 1192 | |
0de8295b | 1193 | if(record.d_ttl > (unsigned int) d_now.tv_sec) { |
8d11c508 PL |
1194 | |
1195 | if (!wasAuthZone && shouldValidate() && (wasAuth || wasForwardRecurse) && state == Indeterminate && d_requireAuthData) { | |
1196 | /* This means we couldn't figure out the state when this entry was cached, | |
1197 | most likely because we hadn't computed the zone cuts yet. */ | |
1198 | /* make sure they are computed before validating */ | |
1199 | DNSName subdomain(foundName); | |
1200 | /* if we are retrieving a DS, we only care about the state of the parent zone */ | |
1201 | if(qtype == QType::DS) | |
1202 | subdomain.chopOff(); | |
1203 | ||
1204 | computeZoneCuts(subdomain, g_rootdnsname, depth); | |
1205 | ||
1206 | vState recordState = getValidationStatus(foundName, false); | |
1207 | if (recordState == Secure) { | |
1208 | LOG(prefix<<qname<<": got Indeterminate state from the "<<foundQT.getName()<<" cache, validating.."<<endl); | |
1209 | state = SyncRes::validateRecordsWithSigs(depth, foundName, foundQT, foundName, cset, signatures); | |
1210 | if (state != Indeterminate) { | |
1211 | LOG(prefix<<qname<<": got Indeterminate state from the CNAME cache, new validation result is "<<vStates[state]<<endl); | |
1212 | if (state == Bogus) { | |
1213 | capTTL = s_maxbogusttl; | |
787737ae | 1214 | } |
8d11c508 | 1215 | updateValidationStatusInCache(foundName, foundQT, wasAuth, state); |
787737ae | 1216 | } |
428f41b7 | 1217 | } |
8d11c508 | 1218 | } |
428f41b7 | 1219 | |
0de8295b | 1220 | LOG(prefix<<qname<<": Found cache "<<foundQT.getName()<<" hit for '"<< foundName << "|"<<foundQT.getName()<<"' to '"<<record.d_content->getZoneRepresentation()<<"', validation state is "<<vStates[state]<<endl); |
1f77f479 | 1221 | |
0de8295b | 1222 | DNSRecord dr = record; |
8d11c508 PL |
1223 | dr.d_ttl -= d_now.tv_sec; |
1224 | dr.d_ttl = std::min(dr.d_ttl, capTTL); | |
1225 | const uint32_t ttl = dr.d_ttl; | |
1226 | ret.reserve(ret.size() + 2 + signatures.size() + authorityRecs.size()); | |
1227 | ret.push_back(dr); | |
2b984251 | 1228 | |
8d11c508 PL |
1229 | for(const auto& signature : signatures) { |
1230 | DNSRecord sigdr; | |
1231 | sigdr.d_type=QType::RRSIG; | |
1232 | sigdr.d_name=foundName; | |
1233 | sigdr.d_ttl=ttl; | |
1234 | sigdr.d_content=signature; | |
1235 | sigdr.d_place=DNSResourceRecord::ANSWER; | |
1236 | sigdr.d_class=QClass::IN; | |
1237 | ret.push_back(sigdr); | |
1238 | } | |
4d2be65d | 1239 | |
8d11c508 PL |
1240 | for(const auto& rec : authorityRecs) { |
1241 | DNSRecord authDR(*rec); | |
1242 | authDR.d_ttl=ttl; | |
1243 | ret.push_back(authDR); | |
1244 | } | |
d30b5493 | 1245 | |
8d11c508 PL |
1246 | DNSName newTarget; |
1247 | if (foundQT == QType::DNAME) { | |
1248 | if (qtype == QType::DNAME && qname == foundName) { // client wanted the DNAME, no need to synthesize a CNAME | |
d30b5493 PL |
1249 | res = 0; |
1250 | return true; | |
1251 | } | |
8d11c508 | 1252 | // Synthesize a CNAME |
0de8295b | 1253 | auto dnameRR = getRR<DNAMERecordContent>(record); |
8d11c508 PL |
1254 | if (dnameRR == nullptr) { |
1255 | throw ImmediateServFailException("Unable to get record content for "+foundName.toLogString()+"|DNAME cache entry"); | |
1256 | } | |
1257 | const auto& dnameSuffix = dnameRR->getTarget(); | |
1258 | DNSName targetPrefix = qname.makeRelative(foundName); | |
1259 | try { | |
1260 | dr.d_type = QType::CNAME; | |
1261 | dr.d_name = targetPrefix + foundName; | |
1262 | newTarget = targetPrefix + dnameSuffix; | |
1263 | dr.d_content = std::make_shared<CNAMERecordContent>(CNAMERecordContent(newTarget)); | |
1264 | ret.push_back(dr); | |
1265 | } catch (const std::exception &e) { | |
1266 | // We should probably catch an std::range_error here and set the rcode to YXDOMAIN (RFC 6672, section 2.2) | |
1267 | // But this is consistent with processRecords | |
1268 | throw ImmediateServFailException("Unable to perform DNAME substitution(DNAME owner: '" + foundName.toLogString() + | |
1269 | "', DNAME target: '" + dnameSuffix.toLogString() + "', substituted name: '" + | |
1270 | targetPrefix.toLogString() + "." + dnameSuffix.toLogString() + | |
1271 | "' : " + e.what()); | |
4957a608 | 1272 | } |
d30b5493 | 1273 | |
8d11c508 PL |
1274 | LOG(prefix<<qname<<": Synthesized "<<dr.d_name<<"|CNAME "<<newTarget<<endl); |
1275 | } | |
4d2be65d | 1276 | |
8d11c508 PL |
1277 | if(qtype == QType::CNAME) { // perhaps they really wanted a CNAME! |
1278 | res = 0; | |
4957a608 | 1279 | return true; |
ac539791 | 1280 | } |
8d11c508 PL |
1281 | |
1282 | // We have a DNAME _or_ CNAME cache hit and the client wants something else than those two. | |
1283 | // Let's find the answer! | |
1284 | if (foundQT == QType::CNAME) { | |
0de8295b | 1285 | const auto cnameContent = getRR<CNAMERecordContent>(record); |
8d11c508 PL |
1286 | if (cnameContent == nullptr) { |
1287 | throw ImmediateServFailException("Unable to get record content for "+foundName.toLogString()+"|CNAME cache entry"); | |
1288 | } | |
1289 | newTarget = cnameContent->getTarget(); | |
1290 | } | |
1291 | ||
1292 | set<GetBestNSAnswer>beenthere; | |
1293 | vState cnameState = Indeterminate; | |
1294 | res = doResolve(newTarget, qtype, ret, depth+1, beenthere, cnameState); | |
1295 | LOG(prefix<<qname<<": updating validation state for response to "<<qname<<" from "<<vStates[state]<<" with the state from the DNAME/CNAME quest: "<<vStates[cnameState]<<endl); | |
1296 | updateValidationState(state, cnameState); | |
1297 | ||
1298 | return true; | |
ac539791 | 1299 | } |
afbe2787 | 1300 | } |
8d11c508 | 1301 | throw ImmediateServFailException("Could not determine whether or not there was a CNAME or DNAME in cache for '" + qname.toLogString() + "'"); |
75b49099 BH |
1302 | } |
1303 | ||
f984e703 | 1304 | namespace { |
142ab370 RG |
1305 | struct CacheEntry |
1306 | { | |
1307 | vector<DNSRecord> records; | |
1308 | vector<shared_ptr<RRSIGRecordContent>> signatures; | |
1309 | uint32_t signaturesTTL{std::numeric_limits<uint32_t>::max()}; | |
1310 | }; | |
1311 | struct CacheKey | |
1312 | { | |
1313 | DNSName name; | |
1314 | uint16_t type; | |
1315 | DNSResourceRecord::Place place; | |
1316 | bool operator<(const CacheKey& rhs) const { | |
186e99c9 | 1317 | return tie(type, place, name) < tie(rhs.type, rhs.place, rhs.name); |
142ab370 RG |
1318 | } |
1319 | }; | |
1320 | typedef map<CacheKey, CacheEntry> tcache_t; | |
f984e703 | 1321 | } |
142ab370 RG |
1322 | |
1323 | static void reapRecordsFromNegCacheEntryForValidation(tcache_t& tcache, const vector<DNSRecord>& records) | |
1324 | { | |
1325 | for (const auto& rec : records) { | |
1326 | if (rec.d_type == QType::RRSIG) { | |
1327 | auto rrsig = getRR<RRSIGRecordContent>(rec); | |
1328 | if (rrsig) { | |
1329 | tcache[{rec.d_name, rrsig->d_type, rec.d_place}].signatures.push_back(rrsig); | |
1330 | } | |
1331 | } else { | |
1332 | tcache[{rec.d_name,rec.d_type,rec.d_place}].records.push_back(rec); | |
1333 | } | |
1334 | } | |
1335 | } | |
1336 | ||
6909b8c5 PL |
1337 | /*! |
1338 | * Convience function to push the records from records into ret with a new TTL | |
1339 | * | |
1340 | * \param records DNSRecords that need to go into ret | |
1341 | * \param ttl The new TTL for these records | |
1342 | * \param ret The vector of DNSRecords that should contian the records with the modified TTL | |
1343 | */ | |
1344 | static void addTTLModifiedRecords(const vector<DNSRecord>& records, const uint32_t ttl, vector<DNSRecord>& ret) { | |
39ce10b2 PL |
1345 | for (const auto& rec : records) { |
1346 | DNSRecord r(rec); | |
1347 | r.d_ttl = ttl; | |
1348 | ret.push_back(r); | |
1349 | } | |
1350 | } | |
1351 | ||
28364e4b | 1352 | void SyncRes::computeNegCacheValidationStatus(const NegCache::NegCacheEntry* ne, const DNSName& qname, const QType& qtype, const int res, vState& state, unsigned int depth) |
142ab370 | 1353 | { |
f4de85a3 RG |
1354 | DNSName subdomain(qname); |
1355 | /* if we are retrieving a DS, we only care about the state of the parent zone */ | |
1356 | if(qtype == QType::DS) | |
1357 | subdomain.chopOff(); | |
1358 | ||
1359 | computeZoneCuts(subdomain, g_rootdnsname, depth); | |
142ab370 RG |
1360 | |
1361 | tcache_t tcache; | |
28364e4b RG |
1362 | reapRecordsFromNegCacheEntryForValidation(tcache, ne->authoritySOA.records); |
1363 | reapRecordsFromNegCacheEntryForValidation(tcache, ne->authoritySOA.signatures); | |
1364 | reapRecordsFromNegCacheEntryForValidation(tcache, ne->DNSSECRecords.records); | |
1365 | reapRecordsFromNegCacheEntryForValidation(tcache, ne->DNSSECRecords.signatures); | |
142ab370 RG |
1366 | |
1367 | for (const auto& entry : tcache) { | |
1368 | // this happens when we did store signatures, but passed on the records themselves | |
1369 | if (entry.second.records.empty()) { | |
1370 | continue; | |
1371 | } | |
1372 | ||
1373 | const DNSName& owner = entry.first.name; | |
1374 | ||
1375 | vState recordState = getValidationStatus(owner, false); | |
1376 | if (state == Indeterminate) { | |
1377 | state = recordState; | |
1378 | } | |
1379 | ||
1380 | if (recordState == Secure) { | |
f4de85a3 RG |
1381 | recordState = SyncRes::validateRecordsWithSigs(depth, qname, qtype, owner, entry.second.records, entry.second.signatures); |
1382 | } | |
142ab370 | 1383 | |
f4de85a3 RG |
1384 | if (recordState != Indeterminate && recordState != state) { |
1385 | updateValidationState(state, recordState); | |
1386 | if (state != Secure) { | |
1387 | break; | |
142ab370 RG |
1388 | } |
1389 | } | |
1390 | } | |
1391 | ||
1392 | if (state == Secure) { | |
28364e4b | 1393 | vState neValidationState = ne->d_validationState; |
142ab370 | 1394 | dState expectedState = res == RCode::NXDomain ? NXDOMAIN : NXQTYPE; |
28364e4b RG |
1395 | dState denialState = getDenialValidationState(*ne, state, expectedState, false); |
1396 | updateDenialValidationState(neValidationState, ne->d_name, state, denialState, expectedState, qtype == QType::DS); | |
142ab370 RG |
1397 | } |
1398 | if (state != Indeterminate) { | |
1399 | /* validation succeeded, let's update the cache entry so we don't have to validate again */ | |
b9473937 RG |
1400 | boost::optional<uint32_t> capTTD = boost::none; |
1401 | if (state == Bogus) { | |
1402 | capTTD = d_now.tv_sec + s_maxbogusttl; | |
1403 | } | |
1404 | t_sstorage.negcache.updateValidationStatus(ne->d_name, ne->d_qtype, state, capTTD); | |
142ab370 RG |
1405 | } |
1406 | } | |
e325f20c | 1407 | |
ad797d94 | 1408 | 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 | 1409 | { |
fd8bc993 | 1410 | bool giveNegative=false; |
710af846 | 1411 | |
be718669 | 1412 | string prefix; |
77499b05 | 1413 | if(doLog()) { |
ded77b10 BH |
1414 | prefix=d_prefix; |
1415 | prefix.append(depth, ' '); | |
1416 | } | |
afbe2787 | 1417 | |
30e9bd93 | 1418 | // 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 | 1419 | DNSName sqname(qname); |
288f4aa9 | 1420 | QType sqt(qtype); |
092f210a | 1421 | uint32_t sttl=0; |
2189085d | 1422 | // cout<<"Lookup for '"<<qname<<"|"<<qtype.getName()<<"' -> "<<getLastLabel(qname)<<endl; |
4d2be65d | 1423 | vState cachedState; |
28364e4b | 1424 | const NegCache::NegCacheEntry* ne = nullptr; |
64a8b6a1 | 1425 | |
710af846 | 1426 | if(s_rootNXTrust && |
157647ec | 1427 | t_sstorage.negcache.getRootNXTrust(qname, d_now, &ne) && |
28364e4b | 1428 | ne->d_auth.isRoot() && |
e1636f82 | 1429 | !(wasForwardedOrAuthZone && !authname.isRoot())) { // when forwarding, the root may only neg-cache if it was forwarded to. |
28364e4b RG |
1430 | sttl = ne->d_ttd - d_now.tv_sec; |
1431 | LOG(prefix<<qname<<": Entire name '"<<qname<<"', is negatively cached via '"<<ne->d_auth<<"' & '"<<ne->d_name<<"' for another "<<sttl<<" seconds"<<endl); | |
3ddb9247 | 1432 | res = RCode::NXDomain; |
39ce10b2 | 1433 | giveNegative = true; |
28364e4b | 1434 | cachedState = ne->d_validationState; |
157647ec | 1435 | } else if (t_sstorage.negcache.get(qname, qtype, d_now, &ne)) { |
b0c164a2 RG |
1436 | /* If we are looking for a DS, discard NXD if auth == qname |
1437 | and ask for a specific denial instead */ | |
28364e4b RG |
1438 | if (qtype != QType::DS || ne->d_qtype.getCode() || ne->d_auth != qname || |
1439 | t_sstorage.negcache.get(qname, qtype, d_now, &ne, true)) | |
b0c164a2 | 1440 | { |
157647ec | 1441 | res = RCode::NXDomain; |
28364e4b | 1442 | sttl = ne->d_ttd - d_now.tv_sec; |
b0c164a2 | 1443 | giveNegative = true; |
28364e4b | 1444 | cachedState = ne->d_validationState; |
157647ec | 1445 | if (ne->d_qtype.getCode()) { |
28364e4b | 1446 | LOG(prefix<<qname<<": "<<qtype.getName()<<" is negatively cached via '"<<ne->d_auth<<"' for another "<<sttl<<" seconds"<<endl); |
b0c164a2 | 1447 | res = RCode::NoError; |
157647ec PL |
1448 | } else { |
1449 | LOG(prefix<<qname<<": Entire name '"<<qname<<" is negatively cached via '"<<ne->d_auth<<"' for another "<<sttl<<" seconds"<<endl); | |
b0c164a2 | 1450 | } |
157647ec | 1451 | } |
d40a915b | 1452 | } else if (s_hardenNXD != HardenNXD::No && !qname.isRoot() && !wasForwardedOrAuthZone) { |
157647ec PL |
1453 | auto labels = qname.getRawLabels(); |
1454 | DNSName negCacheName(g_rootdnsname); | |
1455 | negCacheName.prependRawLabel(labels.back()); | |
1456 | labels.pop_back(); | |
1457 | while(!labels.empty()) { | |
1458 | if (t_sstorage.negcache.get(negCacheName, QType(0), d_now, &ne, true)) { | |
d40a915b OM |
1459 | if (ne->d_validationState == Indeterminate && validationEnabled()) { |
1460 | // LOG(prefix << negCacheName << " negatively cached and Indeterminate, trying to validate NXDOMAIN" << endl); | |
1461 | // ... | |
1462 | // And get the updated ne struct | |
1463 | //t_sstorage.negcache.get(negCacheName, QType(0), d_now, &ne, true); | |
1464 | } | |
7ce0efaa | 1465 | if ((s_hardenNXD == HardenNXD::Yes && ne->d_validationState != Bogus) || ne->d_validationState == Secure) { |
d40a915b OM |
1466 | res = RCode::NXDomain; |
1467 | sttl = ne->d_ttd - d_now.tv_sec; | |
1468 | giveNegative = true; | |
1469 | cachedState = ne->d_validationState; | |
1470 | LOG(prefix<<qname<<": Name '"<<negCacheName<<"' and below, is negatively cached via '"<<ne->d_auth<<"' for another "<<sttl<<" seconds"<<endl); | |
1471 | break; | |
1472 | } | |
b0c164a2 | 1473 | } |
157647ec PL |
1474 | negCacheName.prependRawLabel(labels.back()); |
1475 | labels.pop_back(); | |
39ce10b2 | 1476 | } |
39ce10b2 PL |
1477 | } |
1478 | ||
1479 | if (giveNegative) { | |
142ab370 RG |
1480 | |
1481 | state = cachedState; | |
1482 | ||
e1636f82 | 1483 | if (!wasAuthZone && shouldValidate() && state == Indeterminate) { |
142ab370 RG |
1484 | LOG(prefix<<qname<<": got Indeterminate state for records retrieved from the negative cache, validating.."<<endl); |
1485 | computeNegCacheValidationStatus(ne, qname, qtype, res, state, depth); | |
b9473937 RG |
1486 | |
1487 | if (state != cachedState && state == Bogus) { | |
1488 | sttl = std::min(sttl, s_maxbogusttl); | |
1489 | } | |
142ab370 RG |
1490 | } |
1491 | ||
39ce10b2 | 1492 | // Transplant SOA to the returned packet |
28364e4b | 1493 | addTTLModifiedRecords(ne->authoritySOA.records, sttl, ret); |
4d00b38b | 1494 | if(d_doDNSSEC) { |
28364e4b RG |
1495 | addTTLModifiedRecords(ne->authoritySOA.signatures, sttl, ret); |
1496 | addTTLModifiedRecords(ne->DNSSECRecords.records, sttl, ret); | |
1497 | addTTLModifiedRecords(ne->DNSSECRecords.signatures, sttl, ret); | |
4d00b38b | 1498 | } |
4d2be65d | 1499 | |
142ab370 | 1500 | LOG(prefix<<qname<<": updating validation state with negative cache content for "<<qname<<" to "<<vStates[state]<<endl); |
39ce10b2 | 1501 | return true; |
fd8bc993 | 1502 | } |
39ce10b2 | 1503 | |
e325f20c | 1504 | vector<DNSRecord> cset; |
75b49099 | 1505 | bool found=false, expired=false; |
57769f13 | 1506 | vector<std::shared_ptr<RRSIGRecordContent>> signatures; |
2b984251 | 1507 | vector<std::shared_ptr<DNSRecord>> authorityRecs; |
57769f13 | 1508 | uint32_t ttl=0; |
b9473937 | 1509 | uint32_t capTTL = std::numeric_limits<uint32_t>::max(); |
428f41b7 | 1510 | bool wasCachedAuth; |
ad797d94 | 1511 | 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 | 1512 | |
2189085d | 1513 | LOG(prefix<<sqname<<": Found cache hit for "<<sqt.getName()<<": "); |
428f41b7 | 1514 | |
dff3ef07 | 1515 | if (!wasAuthZone && shouldValidate() && (wasCachedAuth || wasForwardRecurse) && cachedState == Indeterminate && d_requireAuthData) { |
428f41b7 RG |
1516 | |
1517 | /* This means we couldn't figure out the state when this entry was cached, | |
1518 | most likely because we hadn't computed the zone cuts yet. */ | |
aa30ad7e | 1519 | /* make sure they are computed before validating */ |
f4de85a3 RG |
1520 | DNSName subdomain(sqname); |
1521 | /* if we are retrieving a DS, we only care about the state of the parent zone */ | |
1522 | if(qtype == QType::DS) | |
1523 | subdomain.chopOff(); | |
1524 | ||
1525 | computeZoneCuts(subdomain, g_rootdnsname, depth); | |
aa30ad7e | 1526 | |
142ab370 | 1527 | vState recordState = getValidationStatus(qname, false); |
787737ae RG |
1528 | if (recordState == Secure) { |
1529 | LOG(prefix<<sqname<<": got Indeterminate state from the cache, validating.."<<endl); | |
1530 | cachedState = SyncRes::validateRecordsWithSigs(depth, sqname, sqt, sqname, cset, signatures); | |
f4de85a3 RG |
1531 | } |
1532 | else { | |
1533 | cachedState = recordState; | |
1534 | } | |
787737ae | 1535 | |
f4de85a3 RG |
1536 | if (cachedState != Indeterminate) { |
1537 | LOG(prefix<<qname<<": got Indeterminate state from the cache, validation result is "<<vStates[cachedState]<<endl); | |
b9473937 RG |
1538 | if (cachedState == Bogus) { |
1539 | capTTL = s_maxbogusttl; | |
1540 | } | |
1541 | updateValidationStatusInCache(sqname, sqt, wasCachedAuth, cachedState); | |
787737ae | 1542 | } |
428f41b7 RG |
1543 | } |
1544 | ||
e325f20c | 1545 | for(auto j=cset.cbegin() ; j != cset.cend() ; ++j) { |
c5310862 | 1546 | |
e325f20c | 1547 | LOG(j->d_content->getZoneRepresentation()); |
c5310862 RG |
1548 | |
1549 | if (j->d_class != QClass::IN) { | |
1550 | continue; | |
1551 | } | |
1552 | ||
e325f20c | 1553 | if(j->d_ttl>(unsigned int) d_now.tv_sec) { |
1554 | DNSRecord dr=*j; | |
b9473937 RG |
1555 | dr.d_ttl -= d_now.tv_sec; |
1556 | dr.d_ttl = std::min(dr.d_ttl, capTTL); | |
1557 | ttl = dr.d_ttl; | |
e325f20c | 1558 | ret.push_back(dr); |
1559 | LOG("[ttl="<<dr.d_ttl<<"] "); | |
4957a608 | 1560 | found=true; |
ac539791 | 1561 | } |
75b49099 | 1562 | else { |
77499b05 | 1563 | LOG("[expired] "); |
4957a608 | 1564 | expired=true; |
75b49099 | 1565 | } |
afbe2787 | 1566 | } |
57769f13 | 1567 | |
f128d20d RG |
1568 | ret.reserve(ret.size() + signatures.size() + authorityRecs.size()); |
1569 | ||
57769f13 | 1570 | for(const auto& signature : signatures) { |
e325f20c | 1571 | DNSRecord dr; |
1572 | dr.d_type=QType::RRSIG; | |
1573 | dr.d_name=sqname; | |
1574 | dr.d_ttl=ttl; | |
1575 | dr.d_content=signature; | |
39ce10b2 | 1576 | dr.d_place = DNSResourceRecord::ANSWER; |
4d2be65d | 1577 | dr.d_class=QClass::IN; |
e325f20c | 1578 | ret.push_back(dr); |
57769f13 | 1579 | } |
2b984251 RG |
1580 | |
1581 | for(const auto& rec : authorityRecs) { | |
1582 | DNSRecord dr(*rec); | |
1583 | dr.d_ttl=ttl; | |
1584 | ret.push_back(dr); | |
1585 | } | |
1586 | ||
77499b05 | 1587 | LOG(endl); |
f4df5e89 | 1588 | if(found && !expired) { |
4d2be65d | 1589 | if (!giveNegative) |
4957a608 | 1590 | res=0; |
bcb05770 | 1591 | LOG(prefix<<qname<<": updating validation state with cache content for "<<qname<<" to "<<vStates[cachedState]<<endl); |
4d2be65d | 1592 | state = cachedState; |
75b49099 | 1593 | return true; |
f4df5e89 | 1594 | } |
75b49099 | 1595 | else |
2189085d | 1596 | LOG(prefix<<qname<<": cache had only stale entries"<<endl); |
afbe2787 | 1597 | } |
f4df5e89 | 1598 | |
75b49099 BH |
1599 | return false; |
1600 | } | |
afbe2787 | 1601 | |
69cbdef9 | 1602 | bool SyncRes::moreSpecificThan(const DNSName& a, const DNSName &b) const |
75b49099 | 1603 | { |
6a1010f7 | 1604 | return (a.isPartOf(b) && a.countLabels() > b.countLabels()); |
afbe2787 BH |
1605 | } |
1606 | ||
d8d0bb8f | 1607 | struct speedOrder |
eefd15f9 | 1608 | { |
feccaf7f | 1609 | bool operator()(const std::pair<DNSName, double> &a, const std::pair<DNSName, double> &b) const |
c3d9d009 | 1610 | { |
feccaf7f | 1611 | return a.second < b.second; |
c3d9d009 | 1612 | } |
c3d9d009 BH |
1613 | }; |
1614 | ||
feccaf7f | 1615 | inline std::vector<std::pair<DNSName, double>> SyncRes::shuffleInSpeedOrder(NsSet &tnameservers, const string &prefix) |
afbe2787 | 1616 | { |
feccaf7f | 1617 | std::vector<std::pair<DNSName, double>> rnameservers; |
5ea6f7de | 1618 | rnameservers.reserve(tnameservers.size()); |
a2d65f83 | 1619 | for(const auto& tns: tnameservers) { |
feccaf7f RG |
1620 | double speed = t_sstorage.nsSpeeds[tns.first].get(&d_now); |
1621 | rnameservers.push_back({tns.first, speed}); | |
a2d65f83 | 1622 | if(tns.first.empty()) // this was an authoritative OOB zone, don't pollute the nsSpeeds with that |
1623 | return rnameservers; | |
21f0f88b | 1624 | } |
461df9d2 | 1625 | |
feccaf7f RG |
1626 | random_shuffle(rnameservers.begin(),rnameservers.end()); |
1627 | speedOrder so; | |
996c89cc | 1628 | stable_sort(rnameservers.begin(),rnameservers.end(), so); |
710af846 | 1629 | |
77499b05 BH |
1630 | if(doLog()) { |
1631 | LOG(prefix<<"Nameservers: "); | |
feccaf7f RG |
1632 | for(auto i=rnameservers.begin();i!=rnameservers.end();++i) { |
1633 | if(i!=rnameservers.begin()) { | |
77499b05 BH |
1634 | LOG(", "); |
1635 | if(!((i-rnameservers.begin())%3)) { | |
1636 | LOG(endl<<prefix<<" "); | |
1637 | } | |
d8d0bb8f | 1638 | } |
feccaf7f | 1639 | LOG(i->first.toLogString()<<"(" << (boost::format("%0.2f") % (i->second/1000.0)).str() <<"ms)"); |
d8d0bb8f | 1640 | } |
77499b05 | 1641 | LOG(endl); |
d8d0bb8f | 1642 | } |
728485ca | 1643 | return rnameservers; |
afbe2787 BH |
1644 | } |
1645 | ||
cc11d7f4 | 1646 | inline vector<ComboAddress> SyncRes::shuffleForwardSpeed(const vector<ComboAddress> &rnameservers, const string &prefix, const bool wasRd) |
589884b8 | 1647 | { |
cc11d7f4 | 1648 | vector<ComboAddress> nameservers = rnameservers; |
6ed0c28a | 1649 | map<ComboAddress, double> speeds; |
589884b8 | 1650 | |
cc11d7f4 | 1651 | for(const auto& val: nameservers) { |
589884b8 | 1652 | double speed; |
6ed0c28a | 1653 | DNSName nsName = DNSName(val.toStringWithPort()); |
1654 | speed=t_sstorage.nsSpeeds[nsName].get(&d_now); | |
589884b8 | 1655 | speeds[val]=speed; |
1656 | } | |
feccaf7f | 1657 | random_shuffle(nameservers.begin(),nameservers.end()); |
6ed0c28a | 1658 | speedOrderCA so(speeds); |
cc11d7f4 | 1659 | stable_sort(nameservers.begin(),nameservers.end(), so); |
589884b8 | 1660 | |
589884b8 | 1661 | if(doLog()) { |
1662 | LOG(prefix<<"Nameservers: "); | |
cc11d7f4 | 1663 | for(vector<ComboAddress>::const_iterator i=nameservers.cbegin();i!=nameservers.cend();++i) { |
1664 | if(i!=nameservers.cbegin()) { | |
589884b8 | 1665 | LOG(", "); |
cc11d7f4 | 1666 | if(!((i-nameservers.cbegin())%3)) { |
589884b8 | 1667 | LOG(endl<<prefix<<" "); |
1668 | } | |
1669 | } | |
6ed0c28a | 1670 | LOG((wasRd ? string("+") : string("-")) << i->toStringWithPort() <<"(" << (boost::format("%0.2f") % (speeds[*i]/1000.0)).str() <<"ms)"); |
589884b8 | 1671 | } |
1672 | LOG(endl); | |
1673 | } | |
cc11d7f4 | 1674 | return nameservers; |
589884b8 | 1675 | } |
1676 | ||
dbbef467 RG |
1677 | static uint32_t getRRSIGTTL(const time_t now, const std::shared_ptr<RRSIGRecordContent>& rrsig) |
1678 | { | |
1679 | uint32_t res = 0; | |
1680 | if (now < rrsig->d_sigexpire) { | |
1681 | res = static_cast<uint32_t>(rrsig->d_sigexpire) - now; | |
1682 | } | |
1683 | return res; | |
1684 | } | |
1685 | ||
2b984251 RG |
1686 | static const set<uint16_t> nsecTypes = {QType::NSEC, QType::NSEC3}; |
1687 | ||
39ce10b2 PL |
1688 | /* Fills the authoritySOA and DNSSECRecords fields from ne with those found in the records |
1689 | * | |
1690 | * \param records The records to parse for the authority SOA and NSEC(3) records | |
1691 | * \param ne The NegCacheEntry to be filled out (will not be cleared, only appended to | |
1692 | */ | |
dbbef467 | 1693 | static void harvestNXRecords(const vector<DNSRecord>& records, NegCache::NegCacheEntry& ne, const time_t now, uint32_t* lowestTTL) { |
620db2c8 | 1694 | for(const auto& rec : records) { |
39ce10b2 PL |
1695 | if(rec.d_place != DNSResourceRecord::AUTHORITY) |
1696 | // RFC 4035 section 3.1.3. indicates that NSEC records MUST be placed in | |
1697 | // the AUTHORITY section. Section 3.1.1 indicates that that RRSIGs for | |
1698 | // records MUST be in the same section as the records they cover. | |
1699 | // Hence, we ignore all records outside of the AUTHORITY section. | |
1700 | continue; | |
1701 | ||
620db2c8 | 1702 | if(rec.d_type == QType::RRSIG) { |
39ce10b2 PL |
1703 | auto rrsig = getRR<RRSIGRecordContent>(rec); |
1704 | if(rrsig) { | |
1705 | if(rrsig->d_type == QType::SOA) { | |
1706 | ne.authoritySOA.signatures.push_back(rec); | |
dbbef467 RG |
1707 | if (lowestTTL && isRRSIGNotExpired(now, rrsig)) { |
1708 | *lowestTTL = min(*lowestTTL, rec.d_ttl); | |
1709 | *lowestTTL = min(*lowestTTL, getRRSIGTTL(now, rrsig)); | |
1710 | } | |
39ce10b2 PL |
1711 | } |
1712 | if(nsecTypes.count(rrsig->d_type)) { | |
1713 | ne.DNSSECRecords.signatures.push_back(rec); | |
dbbef467 RG |
1714 | if (lowestTTL && isRRSIGNotExpired(now, rrsig)) { |
1715 | *lowestTTL = min(*lowestTTL, rec.d_ttl); | |
1716 | *lowestTTL = min(*lowestTTL, getRRSIGTTL(now, rrsig)); | |
1717 | } | |
39ce10b2 PL |
1718 | } |
1719 | } | |
1720 | continue; | |
1721 | } | |
1722 | if(rec.d_type == QType::SOA) { | |
1723 | ne.authoritySOA.records.push_back(rec); | |
dbbef467 RG |
1724 | if (lowestTTL) { |
1725 | *lowestTTL = min(*lowestTTL, rec.d_ttl); | |
1726 | } | |
39ce10b2 PL |
1727 | continue; |
1728 | } | |
1729 | if(nsecTypes.count(rec.d_type)) { | |
1730 | ne.DNSSECRecords.records.push_back(rec); | |
dbbef467 RG |
1731 | if (lowestTTL) { |
1732 | *lowestTTL = min(*lowestTTL, rec.d_ttl); | |
1733 | } | |
39ce10b2 | 1734 | continue; |
620db2c8 | 1735 | } |
620db2c8 | 1736 | } |
620db2c8 | 1737 | } |
1738 | ||
4d2be65d RG |
1739 | static cspmap_t harvestCSPFromNE(const NegCache::NegCacheEntry& ne) |
1740 | { | |
1741 | cspmap_t cspmap; | |
1742 | for(const auto& rec : ne.DNSSECRecords.signatures) { | |
1743 | if(rec.d_type == QType::RRSIG) { | |
1744 | auto rrc = getRR<RRSIGRecordContent>(rec); | |
1745 | if (rrc) { | |
1746 | cspmap[{rec.d_name,rrc->d_type}].signatures.push_back(rrc); | |
1747 | } | |
1748 | } | |
1749 | } | |
1750 | for(const auto& rec : ne.DNSSECRecords.records) { | |
1751 | cspmap[{rec.d_name, rec.d_type}].records.push_back(rec.d_content); | |
1752 | } | |
1753 | return cspmap; | |
1754 | } | |
1755 | ||
39ce10b2 PL |
1756 | // TODO remove after processRecords is fixed! |
1757 | // Adds the RRSIG for the SOA and the NSEC(3) + RRSIGs to ret | |
620db2c8 | 1758 | static void addNXNSECS(vector<DNSRecord>&ret, const vector<DNSRecord>& records) |
1759 | { | |
39ce10b2 | 1760 | NegCache::NegCacheEntry ne; |
dbbef467 | 1761 | harvestNXRecords(records, ne, 0, nullptr); |
39ce10b2 PL |
1762 | ret.insert(ret.end(), ne.authoritySOA.signatures.begin(), ne.authoritySOA.signatures.end()); |
1763 | ret.insert(ret.end(), ne.DNSSECRecords.records.begin(), ne.DNSSECRecords.records.end()); | |
1764 | ret.insert(ret.end(), ne.DNSSECRecords.signatures.begin(), ne.DNSSECRecords.signatures.end()); | |
620db2c8 | 1765 | } |
1766 | ||
69cbdef9 | 1767 | bool SyncRes::nameserversBlockedByRPZ(const DNSFilterEngine& dfe, const NsSet& nameservers) |
26ca3513 RG |
1768 | { |
1769 | if(d_wantsRPZ) { | |
1770 | for (auto const &ns : nameservers) { | |
69cbdef9 | 1771 | d_appliedPolicy = dfe.getProcessingPolicy(ns.first, d_discardedPolicies); |
26ca3513 RG |
1772 | if (d_appliedPolicy.d_kind != DNSFilterEngine::PolicyKind::NoAction) { // client query needs an RPZ response |
1773 | LOG(", however nameserver "<<ns.first<<" was blocked by RPZ policy '"<<(d_appliedPolicy.d_name ? *d_appliedPolicy.d_name : "")<<"'"<<endl); | |
1774 | return true; | |
1775 | } | |
1776 | ||
1777 | // Traverse all IP addresses for this NS to see if they have an RPN NSIP policy | |
1778 | for (auto const &address : ns.second.first) { | |
69cbdef9 | 1779 | d_appliedPolicy = dfe.getProcessingPolicy(address, d_discardedPolicies); |
26ca3513 RG |
1780 | if (d_appliedPolicy.d_kind != DNSFilterEngine::PolicyKind::NoAction) { // client query needs an RPZ response |
1781 | LOG(", however nameserver "<<ns.first<<" IP address "<<address.toString()<<" was blocked by RPZ policy '"<<(d_appliedPolicy.d_name ? *d_appliedPolicy.d_name : "")<<"'"<<endl); | |
1782 | return true; | |
1783 | } | |
1784 | } | |
1785 | } | |
1786 | } | |
1787 | return false; | |
1788 | } | |
1789 | ||
69cbdef9 | 1790 | bool SyncRes::nameserverIPBlockedByRPZ(const DNSFilterEngine& dfe, const ComboAddress& remoteIP) |
26ca3513 RG |
1791 | { |
1792 | if (d_wantsRPZ) { | |
69cbdef9 | 1793 | d_appliedPolicy = dfe.getProcessingPolicy(remoteIP, d_discardedPolicies); |
26ca3513 RG |
1794 | if (d_appliedPolicy.d_kind != DNSFilterEngine::PolicyKind::NoAction) { |
1795 | LOG(" (blocked by RPZ policy '"+(d_appliedPolicy.d_name ? *d_appliedPolicy.d_name : "")+"')"); | |
1796 | return true; | |
1797 | } | |
1798 | } | |
1799 | return false; | |
1800 | } | |
1801 | ||
feccaf7f | 1802 | vector<ComboAddress> SyncRes::retrieveAddressesForNS(const std::string& prefix, const DNSName& qname, std::vector<std::pair<DNSName, double>>::const_iterator& tns, const unsigned int depth, set<GetBestNSAnswer>& beenthere, const vector<std::pair<DNSName, double>>& rnameservers, NsSet& nameservers, bool& sendRDQuery, bool& pierceDontQuery, bool& flawedNSSet, bool cacheOnly) |
26ca3513 RG |
1803 | { |
1804 | vector<ComboAddress> result; | |
1805 | ||
feccaf7f RG |
1806 | if(!tns->first.empty()) { |
1807 | LOG(prefix<<qname<<": Trying to resolve NS '"<<tns->first<< "' ("<<1+tns-rnameservers.begin()<<"/"<<(unsigned int)rnameservers.size()<<")"<<endl); | |
1808 | result = getAddrs(tns->first, depth+2, beenthere, cacheOnly); | |
26ca3513 RG |
1809 | pierceDontQuery=false; |
1810 | } | |
1811 | else { | |
1812 | LOG(prefix<<qname<<": Domain has hardcoded nameserver"); | |
1813 | ||
feccaf7f | 1814 | if(nameservers[tns->first].first.size() > 1) { |
26ca3513 RG |
1815 | LOG("s"); |
1816 | } | |
1817 | LOG(endl); | |
1818 | ||
feccaf7f RG |
1819 | sendRDQuery = nameservers[tns->first].second; |
1820 | result = shuffleForwardSpeed(nameservers[tns->first].first, doLog() ? (prefix+qname.toString()+": ") : string(), sendRDQuery); | |
26ca3513 RG |
1821 | pierceDontQuery=true; |
1822 | } | |
1823 | return result; | |
1824 | } | |
1825 | ||
1826 | bool SyncRes::throttledOrBlocked(const std::string& prefix, const ComboAddress& remoteIP, const DNSName& qname, const QType& qtype, bool pierceDontQuery) | |
1827 | { | |
a712cb56 | 1828 | if(t_sstorage.throttle.shouldThrottle(d_now.tv_sec, boost::make_tuple(remoteIP, "", 0))) { |
26ca3513 RG |
1829 | LOG(prefix<<qname<<": server throttled "<<endl); |
1830 | s_throttledqueries++; d_throttledqueries++; | |
1831 | return true; | |
1832 | } | |
a712cb56 | 1833 | else if(t_sstorage.throttle.shouldThrottle(d_now.tv_sec, boost::make_tuple(remoteIP, qname, qtype.getCode()))) { |
6dfff36f | 1834 | LOG(prefix<<qname<<": query throttled "<<remoteIP.toString()<<", "<<qname<<"; "<<qtype.getName()<<endl); |
26ca3513 RG |
1835 | s_throttledqueries++; d_throttledqueries++; |
1836 | return true; | |
1837 | } | |
9065eb05 | 1838 | else if(!pierceDontQuery && s_dontQuery && s_dontQuery->match(&remoteIP)) { |
26ca3513 RG |
1839 | LOG(prefix<<qname<<": not sending query to " << remoteIP.toString() << ", blocked by 'dont-query' setting" << endl); |
1840 | s_dontqueries++; | |
1841 | return true; | |
1842 | } | |
1843 | return false; | |
1844 | } | |
1845 | ||
4d2be65d RG |
1846 | bool SyncRes::validationEnabled() const |
1847 | { | |
8455425c | 1848 | return g_dnssecmode != DNSSECMode::Off && g_dnssecmode != DNSSECMode::ProcessNoValidate; |
4d2be65d RG |
1849 | } |
1850 | ||
1851 | uint32_t SyncRes::computeLowestTTD(const std::vector<DNSRecord>& records, const std::vector<std::shared_ptr<RRSIGRecordContent> >& signatures, uint32_t signaturesTTL) const | |
26ca3513 | 1852 | { |
4d2be65d RG |
1853 | uint32_t lowestTTD = std::numeric_limits<uint32_t>::max(); |
1854 | for(const auto& record : records) | |
1855 | lowestTTD = min(lowestTTD, record.d_ttl); | |
1856 | ||
0c43f455 RG |
1857 | /* even if it was not requested for that request (Process, and neither AD nor DO set), |
1858 | it might be requested at a later time so we need to be careful with the TTL. */ | |
4d2be65d | 1859 | if (validationEnabled() && !signatures.empty()) { |
3cef03e9 | 1860 | /* if we are validating, we don't want to cache records after their signatures expire. */ |
4d2be65d RG |
1861 | /* records TTL are now TTD, let's add 'now' to the signatures lowest TTL */ |
1862 | lowestTTD = min(lowestTTD, static_cast<uint32_t>(signaturesTTL + d_now.tv_sec)); | |
1863 | ||
1864 | for(const auto& sig : signatures) { | |
dbbef467 RG |
1865 | if (isRRSIGNotExpired(d_now.tv_sec, sig)) { |
1866 | // we don't decerement d_sigexpire by 'now' because we actually want a TTD, not a TTL */ | |
4d2be65d RG |
1867 | lowestTTD = min(lowestTTD, static_cast<uint32_t>(sig->d_sigexpire)); |
1868 | } | |
1869 | } | |
1870 | } | |
1871 | ||
1872 | return lowestTTD; | |
1873 | } | |
1874 | ||
1875 | void SyncRes::updateValidationState(vState& state, const vState stateUpdate) | |
1876 | { | |
f715542c | 1877 | LOG(d_prefix<<"validation state was "<<std::string(vStates[state])<<", state update is "<<std::string(vStates[stateUpdate])); |
4d2be65d | 1878 | |
895449a5 RG |
1879 | if (stateUpdate == TA) { |
1880 | state = Secure; | |
4d2be65d RG |
1881 | } |
1882 | else if (stateUpdate == NTA) { | |
1883 | state = Insecure; | |
1884 | } | |
895449a5 RG |
1885 | else if (stateUpdate == Bogus) { |
1886 | state = Bogus; | |
1887 | } | |
1888 | else if (state == Indeterminate) { | |
1889 | state = stateUpdate; | |
1890 | } | |
4d2be65d RG |
1891 | else if (stateUpdate == Insecure) { |
1892 | if (state != Bogus) { | |
1893 | state = Insecure; | |
1894 | } | |
1895 | } | |
f715542c | 1896 | LOG(", validation state is now "<<std::string(vStates[state])<<endl); |
4d2be65d RG |
1897 | } |
1898 | ||
1899 | vState SyncRes::getTA(const DNSName& zone, dsmap_t& ds) | |
1900 | { | |
1901 | auto luaLocal = g_luaconfs.getLocal(); | |
1902 | ||
1903 | if (luaLocal->dsAnchors.empty()) { | |
e77f01d1 | 1904 | LOG(d_prefix<<": No trust anchors configured, everything is Insecure"<<endl); |
4d2be65d RG |
1905 | /* We have no TA, everything is insecure */ |
1906 | return Insecure; | |
1907 | } | |
1908 | ||
1909 | std::string reason; | |
1910 | if (haveNegativeTrustAnchor(luaLocal->negAnchors, zone, reason)) { | |
e77f01d1 | 1911 | LOG(d_prefix<<": got NTA for '"<<zone<<"'"<<endl); |
4d2be65d RG |
1912 | return NTA; |
1913 | } | |
1914 | ||
1915 | if (getTrustAnchor(luaLocal->dsAnchors, zone, ds)) { | |
e77f01d1 | 1916 | LOG(d_prefix<<": got TA for '"<<zone<<"'"<<endl); |
895449a5 | 1917 | return TA; |
4d2be65d | 1918 | } |
e77f01d1 | 1919 | else { |
1920 | LOG(d_prefix<<": no TA found for '"<<zone<<"' among "<< luaLocal->dsAnchors.size()<<endl); | |
1921 | } | |
4d2be65d RG |
1922 | |
1923 | if (zone.isRoot()) { | |
1924 | /* No TA for the root */ | |
1925 | return Insecure; | |
1926 | } | |
1927 | ||
1928 | return Indeterminate; | |
1929 | } | |
1930 | ||
8455425c RG |
1931 | static size_t countSupportedDS(const dsmap_t& dsmap) |
1932 | { | |
1933 | size_t count = 0; | |
1934 | ||
1935 | for (const auto& ds : dsmap) { | |
1936 | if (isSupportedDS(ds)) { | |
1937 | count++; | |
1938 | } | |
1939 | } | |
1940 | ||
1941 | return count; | |
1942 | } | |
1943 | ||
5374b03b | 1944 | vState SyncRes::getDSRecords(const DNSName& zone, dsmap_t& ds, bool taOnly, unsigned int depth, bool bogusOnNXD, bool* foundCut) |
4d2be65d RG |
1945 | { |
1946 | vState result = getTA(zone, ds); | |
1947 | ||
1948 | if (result != Indeterminate || taOnly) { | |
5374b03b RG |
1949 | if (foundCut) { |
1950 | *foundCut = (result != Indeterminate); | |
1951 | } | |
1952 | ||
18159e92 RG |
1953 | if (result == TA) { |
1954 | if (countSupportedDS(ds) == 0) { | |
1955 | ds.clear(); | |
1956 | result = Insecure; | |
1957 | } | |
1958 | else { | |
1959 | result = Secure; | |
1960 | } | |
1961 | } | |
1962 | else if (result == NTA) { | |
8455425c RG |
1963 | result = Insecure; |
1964 | } | |
1965 | ||
4d2be65d RG |
1966 | return result; |
1967 | } | |
1968 | ||
1969 | bool oldSkipCNAME = d_skipCNAMECheck; | |
4d2be65d | 1970 | d_skipCNAMECheck = true; |
4d2be65d RG |
1971 | |
1972 | std::set<GetBestNSAnswer> beenthere; | |
1973 | std::vector<DNSRecord> dsrecords; | |
1974 | ||
1975 | vState state = Indeterminate; | |
51b6b728 | 1976 | int rcode = doResolve(zone, QType(QType::DS), dsrecords, depth + 1, beenthere, state); |
4d2be65d | 1977 | d_skipCNAMECheck = oldSkipCNAME; |
4d2be65d | 1978 | |
3ca6d908 | 1979 | if (rcode == RCode::NoError || (rcode == RCode::NXDomain && !bogusOnNXD)) { |
1e332f68 PL |
1980 | uint8_t bestDigestType = 0; |
1981 | ||
dd359a9f RG |
1982 | bool gotCNAME = false; |
1983 | for (const auto& record : dsrecords) { | |
1984 | if (record.d_type == QType::DS) { | |
1985 | const auto dscontent = getRR<DSRecordContent>(record); | |
1986 | if (dscontent && isSupportedDS(*dscontent)) { | |
1987 | // Make GOST a lower prio than SHA256 | |
690b86b7 | 1988 | if (dscontent->d_digesttype == DNSSECKeeper::DIGEST_GOST && bestDigestType == DNSSECKeeper::DIGEST_SHA256) { |
dd359a9f | 1989 | continue; |
4d2be65d | 1990 | } |
690b86b7 | 1991 | if (dscontent->d_digesttype > bestDigestType || (bestDigestType == DNSSECKeeper::DIGEST_GOST && dscontent->d_digesttype == DNSSECKeeper::DIGEST_SHA256)) { |
dd359a9f RG |
1992 | bestDigestType = dscontent->d_digesttype; |
1993 | } | |
1994 | ds.insert(*dscontent); | |
1c39e884 | 1995 | } |
4d2be65d | 1996 | } |
dd359a9f RG |
1997 | else if (record.d_type == QType::CNAME && record.d_name == zone) { |
1998 | gotCNAME = true; | |
1999 | } | |
2000 | } | |
4d2be65d | 2001 | |
dd359a9f RG |
2002 | /* RFC 4509 section 3: "Validator implementations SHOULD ignore DS RRs containing SHA-1 |
2003 | * digests if DS RRs with SHA-256 digests are present in the DS RRset." | |
2004 | * As SHA348 is specified as well, the spirit of the this line is "use the best algorithm". | |
2005 | */ | |
2006 | for (auto dsrec = ds.begin(); dsrec != ds.end(); ) { | |
2007 | if (dsrec->d_digesttype != bestDigestType) { | |
2008 | dsrec = ds.erase(dsrec); | |
1e332f68 | 2009 | } |
dd359a9f RG |
2010 | else { |
2011 | ++dsrec; | |
2012 | } | |
2013 | } | |
1e332f68 | 2014 | |
dd359a9f RG |
2015 | if (rcode == RCode::NoError) { |
2016 | if (ds.empty()) { | |
46df9251 RG |
2017 | /* we have no DS, it's either: |
2018 | - a delegation to a non-DNSSEC signed zone | |
2019 | - no delegation, we stay in the same zone | |
2020 | */ | |
dd359a9f RG |
2021 | if (gotCNAME || denialProvesNoDelegation(zone, dsrecords)) { |
2022 | /* we are still inside the same zone */ | |
5374b03b | 2023 | |
dd359a9f | 2024 | if (foundCut) { |
5374b03b | 2025 | *foundCut = false; |
5374b03b | 2026 | } |
dd359a9f RG |
2027 | return state; |
2028 | } | |
5374b03b | 2029 | |
dd359a9f RG |
2030 | /* delegation with no DS, might be Secure -> Insecure */ |
2031 | if (foundCut) { | |
5374b03b RG |
2032 | *foundCut = true; |
2033 | } | |
2034 | ||
46df9251 RG |
2035 | /* a delegation with no DS is either: |
2036 | - a signed zone (Secure) to an unsigned one (Insecure) | |
2037 | - an unsigned zone to another unsigned one (Insecure stays Insecure, Bogus stays Bogus) | |
2038 | */ | |
dd359a9f RG |
2039 | return state == Secure ? Insecure : state; |
2040 | } else { | |
2041 | /* we have a DS */ | |
2042 | if (foundCut) { | |
2043 | *foundCut = true; | |
2044 | } | |
b7f378d1 | 2045 | } |
4d2be65d | 2046 | } |
b7f378d1 | 2047 | |
4d2be65d RG |
2048 | return state; |
2049 | } | |
2050 | ||
bcb05770 | 2051 | LOG(d_prefix<<": returning Bogus state from "<<__func__<<"("<<zone<<")"<<endl); |
4d2be65d RG |
2052 | return Bogus; |
2053 | } | |
2054 | ||
0735b60f RG |
2055 | bool SyncRes::haveExactValidationStatus(const DNSName& domain) |
2056 | { | |
e1636f82 | 2057 | if (!shouldValidate()) { |
0735b60f RG |
2058 | return false; |
2059 | } | |
2060 | const auto& it = d_cutStates.find(domain); | |
2061 | if (it != d_cutStates.cend()) { | |
2062 | return true; | |
2063 | } | |
2064 | return false; | |
2065 | } | |
2066 | ||
5374b03b | 2067 | vState SyncRes::getValidationStatus(const DNSName& subdomain, bool allowIndeterminate) |
70b3fe7a RG |
2068 | { |
2069 | vState result = Indeterminate; | |
2070 | ||
e1636f82 | 2071 | if (!shouldValidate()) { |
70b3fe7a RG |
2072 | return result; |
2073 | } | |
2074 | DNSName name(subdomain); | |
2075 | do { | |
51b6b728 RG |
2076 | const auto& it = d_cutStates.find(name); |
2077 | if (it != d_cutStates.cend()) { | |
5374b03b RG |
2078 | if (allowIndeterminate || it->second != Indeterminate) { |
2079 | LOG(d_prefix<<": got status "<<vStates[it->second]<<" for name "<<subdomain<<" (from "<<name<<")"<<endl); | |
2080 | return it->second; | |
2081 | } | |
70b3fe7a RG |
2082 | } |
2083 | } | |
2084 | while (name.chopOff()); | |
2085 | ||
2086 | return result; | |
2087 | } | |
2088 | ||
c405e222 RG |
2089 | bool SyncRes::lookForCut(const DNSName& qname, unsigned int depth, const vState existingState, vState& newState) |
2090 | { | |
2091 | bool foundCut = false; | |
5374b03b RG |
2092 | dsmap_t ds; |
2093 | vState dsState = getDSRecords(qname, ds, newState == Bogus || existingState == Insecure || existingState == Bogus, depth, false, &foundCut); | |
c405e222 | 2094 | |
5374b03b RG |
2095 | if (dsState != Indeterminate) { |
2096 | newState = dsState; | |
2097 | } | |
c405e222 | 2098 | |
c405e222 RG |
2099 | return foundCut; |
2100 | } | |
2101 | ||
51b6b728 | 2102 | void SyncRes::computeZoneCuts(const DNSName& begin, const DNSName& end, unsigned int depth) |
4d2be65d | 2103 | { |
428f41b7 | 2104 | if(!begin.isPartOf(end)) { |
86f1af1c KM |
2105 | LOG(d_prefix<<" "<<begin.toLogString()<<" is not part of "<<end.toLogString()<<endl); |
2106 | throw PDNSException(begin.toLogString() + " is not part of " + end.toLogString()); | |
428f41b7 RG |
2107 | } |
2108 | ||
51b6b728 | 2109 | if (d_cutStates.count(begin) != 0) { |
ad75fdbd | 2110 | return; |
4d2be65d RG |
2111 | } |
2112 | ||
2113 | dsmap_t ds; | |
51b6b728 | 2114 | vState cutState = getDSRecords(end, ds, false, depth); |
bcb05770 | 2115 | LOG(d_prefix<<": setting cut state for "<<end<<" to "<<vStates[cutState]<<endl); |
51b6b728 | 2116 | d_cutStates[end] = cutState; |
70b3fe7a | 2117 | |
e1636f82 | 2118 | if (!shouldValidate()) { |
ad75fdbd | 2119 | return; |
70b3fe7a RG |
2120 | } |
2121 | ||
70b3fe7a RG |
2122 | DNSName qname(end); |
2123 | std::vector<string> labelsToAdd = begin.makeRelative(end).getRawLabels(); | |
2124 | ||
ad75fdbd | 2125 | bool oldSkipCNAME = d_skipCNAMECheck; |
ad75fdbd | 2126 | d_skipCNAMECheck = true; |
ad75fdbd | 2127 | |
70b3fe7a | 2128 | while(qname != begin) { |
70b3fe7a RG |
2129 | if (labelsToAdd.empty()) |
2130 | break; | |
2131 | ||
2132 | qname.prependRawLabel(labelsToAdd.back()); | |
2133 | labelsToAdd.pop_back(); | |
bcb05770 RG |
2134 | LOG(d_prefix<<": - Looking for a cut at "<<qname<<endl); |
2135 | ||
2136 | const auto cutIt = d_cutStates.find(qname); | |
2137 | if (cutIt != d_cutStates.cend()) { | |
2138 | if (cutIt->second != Indeterminate) { | |
2139 | LOG(d_prefix<<": - Cut already known at "<<qname<<endl); | |
3d4e836e | 2140 | cutState = cutIt->second; |
bcb05770 RG |
2141 | continue; |
2142 | } | |
2143 | } | |
70b3fe7a | 2144 | |
3d4e836e RG |
2145 | /* no need to look for NS and DS if we are already insecure or bogus, |
2146 | just look for (N)TA | |
2147 | */ | |
2148 | if (cutState == Insecure || cutState == Bogus) { | |
2010ac95 RG |
2149 | dsmap_t cutDS; |
2150 | vState newState = getDSRecords(qname, cutDS, true, depth); | |
3d4e836e RG |
2151 | if (newState == Indeterminate) { |
2152 | continue; | |
2153 | } | |
2154 | ||
2155 | LOG(d_prefix<<": New state for "<<qname<<" is "<<vStates[newState]<<endl); | |
3d4e836e RG |
2156 | cutState = newState; |
2157 | ||
2158 | d_cutStates[qname] = cutState; | |
2159 | ||
2160 | continue; | |
2161 | } | |
70b3fe7a | 2162 | |
c405e222 | 2163 | vState newState = Indeterminate; |
428f41b7 RG |
2164 | /* temporarily mark as Indeterminate, so that we won't enter an endless loop |
2165 | trying to determine that zone cut again. */ | |
c405e222 RG |
2166 | d_cutStates[qname] = newState; |
2167 | bool foundCut = lookForCut(qname, depth + 1, cutState, newState); | |
2168 | if (foundCut) { | |
2169 | LOG(d_prefix<<": - Found cut at "<<qname<<endl); | |
2170 | if (newState != Indeterminate) { | |
2171 | cutState = newState; | |
70b3fe7a | 2172 | } |
c405e222 RG |
2173 | LOG(d_prefix<<": New state for "<<qname<<" is "<<vStates[cutState]<<endl); |
2174 | d_cutStates[qname] = cutState; | |
70b3fe7a | 2175 | } |
c405e222 | 2176 | else { |
428f41b7 | 2177 | /* remove the temporary cut */ |
b25712fd | 2178 | LOG(d_prefix<<qname<<": removing cut state for "<<qname<<endl); |
51b6b728 | 2179 | d_cutStates.erase(qname); |
428f41b7 | 2180 | } |
70b3fe7a RG |
2181 | } |
2182 | ||
ad75fdbd | 2183 | d_skipCNAMECheck = oldSkipCNAME; |
ad75fdbd | 2184 | |
bcb05770 | 2185 | LOG(d_prefix<<": list of cuts from "<<begin<<" to "<<end<<endl); |
51b6b728 | 2186 | for (const auto& cut : d_cutStates) { |
bcb05770 | 2187 | if (cut.first.isRoot() || (begin.isPartOf(cut.first) && cut.first.isPartOf(end))) { |
51b6b728 RG |
2188 | LOG(" - "<<cut.first<<": "<<vStates[cut.second]<<endl); |
2189 | } | |
70b3fe7a | 2190 | } |
4d2be65d RG |
2191 | } |
2192 | ||
51b6b728 | 2193 | vState SyncRes::validateDNSKeys(const DNSName& zone, const std::vector<DNSRecord>& dnskeys, const std::vector<std::shared_ptr<RRSIGRecordContent> >& signatures, unsigned int depth) |
4d2be65d RG |
2194 | { |
2195 | dsmap_t ds; | |
2196 | if (!signatures.empty()) { | |
2197 | DNSName signer = getSigner(signatures); | |
2198 | ||
8d2e7fa1 | 2199 | if (!signer.empty() && zone.isPartOf(signer)) { |
51b6b728 | 2200 | vState state = getDSRecords(signer, ds, false, depth); |
b7f378d1 | 2201 | |
4d2be65d RG |
2202 | if (state != Secure) { |
2203 | return state; | |
2204 | } | |
2205 | } | |
2206 | } | |
2207 | ||
2208 | skeyset_t tentativeKeys; | |
2209 | std::vector<shared_ptr<DNSRecordContent> > toSign; | |
2210 | ||
2211 | for (const auto& dnskey : dnskeys) { | |
2212 | if (dnskey.d_type == QType::DNSKEY) { | |
2213 | auto content = getRR<DNSKEYRecordContent>(dnskey); | |
2214 | if (content) { | |
2215 | tentativeKeys.insert(content); | |
2216 | toSign.push_back(content); | |
2217 | } | |
2218 | } | |
2219 | } | |
2220 | ||
bcb05770 | 2221 | LOG(d_prefix<<": trying to validate "<<std::to_string(tentativeKeys.size())<<" DNSKEYs with "<<std::to_string(ds.size())<<" DS"<<endl); |
4d2be65d RG |
2222 | skeyset_t validatedKeys; |
2223 | validateDNSKeysAgainstDS(d_now.tv_sec, zone, ds, tentativeKeys, toSign, signatures, validatedKeys); | |
2224 | ||
bcb05770 | 2225 | LOG(d_prefix<<": we now have "<<std::to_string(validatedKeys.size())<<" DNSKEYs"<<endl); |
4d2be65d | 2226 | |
82fbd934 RG |
2227 | /* if we found at least one valid RRSIG covering the set, |
2228 | all tentative keys are validated keys. Otherwise it means | |
2229 | we haven't found at least one DNSKEY and a matching RRSIG | |
2230 | covering this set, this looks Bogus. */ | |
4d2be65d | 2231 | if (validatedKeys.size() != tentativeKeys.size()) { |
bcb05770 | 2232 | LOG(d_prefix<<": returning Bogus state from "<<__func__<<"("<<zone<<")"<<endl); |
4d2be65d RG |
2233 | return Bogus; |
2234 | } | |
2235 | ||
2236 | return Secure; | |
2237 | } | |
2238 | ||
51b6b728 | 2239 | vState SyncRes::getDNSKeys(const DNSName& signer, skeyset_t& keys, unsigned int depth) |
4d2be65d RG |
2240 | { |
2241 | std::vector<DNSRecord> records; | |
2242 | std::set<GetBestNSAnswer> beenthere; | |
bcb05770 | 2243 | LOG(d_prefix<<"Retrieving DNSKeys for "<<signer<<endl); |
4d2be65d RG |
2244 | |
2245 | vState state = Indeterminate; | |
c7385ddb RG |
2246 | /* following CNAME might lead to us to the wrong DNSKEY */ |
2247 | bool oldSkipCNAME = d_skipCNAMECheck; | |
2248 | d_skipCNAMECheck = true; | |
51b6b728 | 2249 | int rcode = doResolve(signer, QType(QType::DNSKEY), records, depth + 1, beenthere, state); |
c7385ddb | 2250 | d_skipCNAMECheck = oldSkipCNAME; |
4d2be65d RG |
2251 | |
2252 | if (rcode == RCode::NoError) { | |
2253 | if (state == Secure) { | |
2254 | for (const auto& key : records) { | |
2255 | if (key.d_type == QType::DNSKEY) { | |
2256 | auto content = getRR<DNSKEYRecordContent>(key); | |
2257 | if (content) { | |
2258 | keys.insert(content); | |
2259 | } | |
2260 | } | |
2261 | } | |
2262 | } | |
bcb05770 | 2263 | LOG(d_prefix<<"Retrieved "<<keys.size()<<" DNSKeys for "<<signer<<", state is "<<vStates[state]<<endl); |
4d2be65d RG |
2264 | return state; |
2265 | } | |
2266 | ||
bcb05770 | 2267 | LOG(d_prefix<<"Returning Bogus state from "<<__func__<<"("<<signer<<")"<<endl); |
4d2be65d RG |
2268 | return Bogus; |
2269 | } | |
2270 | ||
51b6b728 | 2271 | 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 |
2272 | { |
2273 | skeyset_t keys; | |
2274 | if (!signatures.empty()) { | |
2275 | const DNSName signer = getSigner(signatures); | |
2276 | if (!signer.empty() && name.isPartOf(signer)) { | |
f715542c | 2277 | if ((qtype == QType::DNSKEY || qtype == QType::DS) && signer == qname) { |
15f44f1d | 2278 | /* we are already retrieving those keys, sorry */ |
dd359a9f RG |
2279 | if (qtype == QType::DS) { |
2280 | /* something is very wrong */ | |
2281 | LOG(d_prefix<<"The DS for "<<qname<<" is signed by itself, going Bogus"<<endl); | |
2282 | return Bogus; | |
2283 | } | |
15f44f1d RG |
2284 | return Indeterminate; |
2285 | } | |
51b6b728 | 2286 | vState state = getDNSKeys(signer, keys, depth); |
4d2be65d RG |
2287 | if (state != Secure) { |
2288 | return state; | |
2289 | } | |
2290 | } | |
2291 | } else { | |
bcb05770 | 2292 | LOG(d_prefix<<"Bogus!"<<endl); |
4d2be65d RG |
2293 | return Bogus; |
2294 | } | |
2295 | ||
2296 | std::vector<std::shared_ptr<DNSRecordContent> > recordcontents; | |
2297 | for (const auto& record : records) { | |
2298 | recordcontents.push_back(record.d_content); | |
2299 | } | |
2300 | ||
bcb05770 | 2301 | LOG(d_prefix<<"Going to validate "<<recordcontents.size()<< " record contents with "<<signatures.size()<<" sigs and "<<keys.size()<<" keys for "<<name<<endl); |
4d2be65d | 2302 | if (validateWithKeySet(d_now.tv_sec, name, recordcontents, signatures, keys, false)) { |
bcb05770 | 2303 | LOG(d_prefix<<"Secure!"<<endl); |
4d2be65d RG |
2304 | return Secure; |
2305 | } | |
2306 | ||
bcb05770 | 2307 | LOG(d_prefix<<"Bogus!"<<endl); |
4d2be65d RG |
2308 | return Bogus; |
2309 | } | |
2310 | ||
7155c3e5 RG |
2311 | static bool allowAdditionalEntry(std::unordered_set<DNSName>& allowedAdditionals, const DNSRecord& rec) |
2312 | { | |
2313 | switch(rec.d_type) { | |
2314 | case QType::MX: | |
2315 | { | |
2316 | if (auto mxContent = getRR<MXRecordContent>(rec)) { | |
2317 | allowedAdditionals.insert(mxContent->d_mxname); | |
2318 | } | |
2319 | return true; | |
2320 | } | |
2321 | case QType::NS: | |
2322 | { | |
2323 | if (auto nsContent = getRR<NSRecordContent>(rec)) { | |
2324 | allowedAdditionals.insert(nsContent->getNS()); | |
2325 | } | |
2326 | return true; | |
2327 | } | |
2328 | case QType::SRV: | |
2329 | { | |
2330 | if (auto srvContent = getRR<SRVRecordContent>(rec)) { | |
2331 | allowedAdditionals.insert(srvContent->d_target); | |
2332 | } | |
2333 | return true; | |
2334 | } | |
2335 | default: | |
2336 | return false; | |
2337 | } | |
2338 | } | |
2339 | ||
2340 | void SyncRes::sanitizeRecords(const std::string& prefix, LWResult& lwr, const DNSName& qname, const QType& qtype, const DNSName& auth, bool wasForwarded, bool rdQuery) | |
2341 | { | |
2342 | const bool wasForwardRecurse = wasForwarded && rdQuery; | |
2343 | /* list of names for which we will allow A and AAAA records in the additional section | |
2344 | to remain */ | |
2345 | std::unordered_set<DNSName> allowedAdditionals = { qname }; | |
2346 | bool haveAnswers = false; | |
2347 | bool isNXDomain = false; | |
2348 | bool isNXQType = false; | |
2349 | ||
2350 | for(auto rec = lwr.d_records.begin(); rec != lwr.d_records.end(); ) { | |
2351 | ||
2352 | if (rec->d_type == QType::OPT) { | |
2353 | ++rec; | |
2354 | continue; | |
2355 | } | |
2356 | ||
2357 | if (rec->d_class != QClass::IN) { | |
2358 | LOG(prefix<<"Removing non internet-classed data received from "<<auth<<endl); | |
2359 | rec = lwr.d_records.erase(rec); | |
2360 | continue; | |
2361 | } | |
2362 | ||
2363 | if (rec->d_type == QType::ANY) { | |
2364 | LOG(prefix<<"Removing 'ANY'-typed data received from "<<auth<<endl); | |
2365 | rec = lwr.d_records.erase(rec); | |
2366 | continue; | |
2367 | } | |
2368 | ||
2369 | if (!rec->d_name.isPartOf(auth)) { | |
2370 | LOG(prefix<<"Removing record '"<<rec->d_name<<"|"<<DNSRecordContent::NumberToType(rec->d_type)<<"|"<<rec->d_content->getZoneRepresentation()<<"' in the "<<(int)rec->d_place<<" section received from "<<auth<<endl); | |
2371 | rec = lwr.d_records.erase(rec); | |
2372 | continue; | |
2373 | } | |
2374 | ||
2375 | /* dealing with the records in answer */ | |
2376 | if (!(lwr.d_aabit || wasForwardRecurse) && rec->d_place == DNSResourceRecord::ANSWER) { | |
9870af40 RG |
2377 | /* for now we allow a CNAME for the exact qname in ANSWER with AA=0, because Amazon DNS servers |
2378 | are sending such responses */ | |
2379 | if (!(rec->d_type == QType::CNAME && qname == rec->d_name)) { | |
2380 | LOG(prefix<<"Removing record '"<<rec->d_name<<"|"<<DNSRecordContent::NumberToType(rec->d_type)<<"|"<<rec->d_content->getZoneRepresentation()<<"' in the answer section without the AA bit set received from "<<auth<<endl); | |
2381 | rec = lwr.d_records.erase(rec); | |
2382 | continue; | |
2383 | } | |
7155c3e5 RG |
2384 | } |
2385 | ||
2386 | if (rec->d_type == QType::DNAME && (rec->d_place != DNSResourceRecord::ANSWER || !qname.isPartOf(rec->d_name))) { | |
2387 | LOG(prefix<<"Removing invalid DNAME record '"<<rec->d_name<<"|"<<DNSRecordContent::NumberToType(rec->d_type)<<"|"<<rec->d_content->getZoneRepresentation()<<"' in the "<<(int)rec->d_place<<" section received from "<<auth<<endl); | |
2388 | rec = lwr.d_records.erase(rec); | |
2389 | continue; | |
2390 | } | |
2391 | ||
123da0f8 | 2392 | if (rec->d_place == DNSResourceRecord::ANSWER && (qtype != QType::ANY && rec->d_type != qtype.getCode() && s_redirectionQTypes.count(rec->d_type) == 0 && rec->d_type != QType::SOA && rec->d_type != QType::RRSIG)) { |
7155c3e5 RG |
2393 | LOG(prefix<<"Removing irrelevant record '"<<rec->d_name<<"|"<<DNSRecordContent::NumberToType(rec->d_type)<<"|"<<rec->d_content->getZoneRepresentation()<<"' in the "<<(int)rec->d_place<<" section received from "<<auth<<endl); |
2394 | rec = lwr.d_records.erase(rec); | |
2395 | continue; | |
2396 | } | |
2397 | ||
2398 | if (rec->d_place == DNSResourceRecord::ANSWER && !haveAnswers) { | |
2399 | haveAnswers = true; | |
2400 | } | |
2401 | ||
2402 | if (rec->d_place == DNSResourceRecord::ANSWER) { | |
2403 | allowAdditionalEntry(allowedAdditionals, *rec); | |
2404 | } | |
2405 | ||
2406 | /* dealing with the records in authority */ | |
2407 | if (rec->d_place == DNSResourceRecord::AUTHORITY && rec->d_type != QType::NS && rec->d_type != QType::DS && rec->d_type != QType::SOA && rec->d_type != QType::RRSIG && rec->d_type != QType::NSEC && rec->d_type != QType::NSEC3) { | |
2408 | LOG(prefix<<"Removing irrelevant record '"<<rec->d_name<<"|"<<DNSRecordContent::NumberToType(rec->d_type)<<"|"<<rec->d_content->getZoneRepresentation()<<"' in the "<<(int)rec->d_place<<" section received from "<<auth<<endl); | |
2409 | rec = lwr.d_records.erase(rec); | |
2410 | continue; | |
2411 | } | |
2412 | ||
2413 | if (rec->d_place == DNSResourceRecord::AUTHORITY && rec->d_type == QType::SOA) { | |
2414 | if (!qname.isPartOf(rec->d_name)) { | |
2415 | LOG(prefix<<"Removing irrelevant record '"<<rec->d_name<<"|"<<DNSRecordContent::NumberToType(rec->d_type)<<"|"<<rec->d_content->getZoneRepresentation()<<"' in the "<<(int)rec->d_place<<" section received from "<<auth<<endl); | |
2416 | rec = lwr.d_records.erase(rec); | |
2417 | continue; | |
2418 | } | |
2419 | ||
215c16f9 RG |
2420 | if (!(lwr.d_aabit || wasForwardRecurse)) { |
2421 | LOG(prefix<<"Removing irrelevant record '"<<rec->d_name<<"|"<<DNSRecordContent::NumberToType(rec->d_type)<<"|"<<rec->d_content->getZoneRepresentation()<<"' in the "<<(int)rec->d_place<<" section received from "<<auth<<endl); | |
2422 | rec = lwr.d_records.erase(rec); | |
2423 | continue; | |
2424 | } | |
2425 | ||
7155c3e5 RG |
2426 | if (!haveAnswers) { |
2427 | if (lwr.d_rcode == RCode::NXDomain) { | |
2428 | isNXDomain = true; | |
2429 | } | |
2430 | else if (lwr.d_rcode == RCode::NoError) { | |
2431 | isNXQType = true; | |
2432 | } | |
2433 | } | |
2434 | } | |
2435 | ||
2436 | if (rec->d_place == DNSResourceRecord::AUTHORITY && rec->d_type == QType::NS && (isNXDomain || isNXQType)) { | |
2437 | /* we don't want to pick up NS records in AUTHORITY or ADDITIONAL sections of NXDomain answers | |
2438 | because they are somewhat easy to insert into a large, fragmented UDP response | |
1bb97c02 | 2439 | for an off-path attacker by injecting spoofed UDP fragments. |
7155c3e5 RG |
2440 | */ |
2441 | LOG(prefix<<"Removing NS record '"<<rec->d_name<<"|"<<DNSRecordContent::NumberToType(rec->d_type)<<"|"<<rec->d_content->getZoneRepresentation()<<"' in the "<<(int)rec->d_place<<" section of a "<<(isNXDomain ? "NXD" : "NXQTYPE")<<" response received from "<<auth<<endl); | |
2442 | rec = lwr.d_records.erase(rec); | |
1bb97c02 | 2443 | continue; |
7155c3e5 RG |
2444 | } |
2445 | ||
2446 | if (rec->d_place == DNSResourceRecord::AUTHORITY && rec->d_type == QType::NS) { | |
2447 | allowAdditionalEntry(allowedAdditionals, *rec); | |
2448 | } | |
2449 | ||
2450 | /* dealing with the records in additional */ | |
2451 | if (rec->d_place == DNSResourceRecord::ADDITIONAL && rec->d_type != QType::A && rec->d_type != QType::AAAA && rec->d_type != QType::RRSIG) { | |
2452 | LOG(prefix<<"Removing irrelevant record '"<<rec->d_name<<"|"<<DNSRecordContent::NumberToType(rec->d_type)<<"|"<<rec->d_content->getZoneRepresentation()<<"' in the "<<(int)rec->d_place<<" section received from "<<auth<<endl); | |
2453 | rec = lwr.d_records.erase(rec); | |
2454 | continue; | |
2455 | } | |
2456 | ||
2457 | if (rec->d_place == DNSResourceRecord::ADDITIONAL && allowedAdditionals.count(rec->d_name) == 0) { | |
2458 | LOG(prefix<<"Removing irrelevant additional record '"<<rec->d_name<<"|"<<DNSRecordContent::NumberToType(rec->d_type)<<"|"<<rec->d_content->getZoneRepresentation()<<"' in the "<<(int)rec->d_place<<" section received from "<<auth<<endl); | |
2459 | rec = lwr.d_records.erase(rec); | |
2460 | continue; | |
2461 | } | |
2462 | ||
2463 | ++rec; | |
2464 | } | |
2465 | } | |
2466 | ||
78cdf520 | 2467 | 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, bool& gatherWildcardProof, unsigned int& wildcardLabelsCount, bool rdQuery) |
4d2be65d | 2468 | { |
ba40d3d7 | 2469 | bool wasForwardRecurse = wasForwarded && rdQuery; |
26ca3513 RG |
2470 | tcache_t tcache; |
2471 | ||
4d2be65d RG |
2472 | string prefix; |
2473 | if(doLog()) { | |
2474 | prefix=d_prefix; | |
2475 | prefix.append(depth, ' '); | |
2476 | } | |
2477 | ||
7155c3e5 RG |
2478 | sanitizeRecords(prefix, lwr, qname, qtype, auth, wasForwarded, rdQuery); |
2479 | ||
2b984251 | 2480 | std::vector<std::shared_ptr<DNSRecord>> authorityRecs; |
142ab370 | 2481 | const unsigned int labelCount = qname.countLabels(); |
a82d4e27 | 2482 | bool isCNAMEAnswer = false; |
8838c88f | 2483 | bool isDNAMEAnswer = false; |
26ca3513 | 2484 | for(const auto& rec : lwr.d_records) { |
c5310862 RG |
2485 | if (rec.d_class != QClass::IN) { |
2486 | continue; | |
2487 | } | |
2488 | ||
d30b5493 | 2489 | if(!isCNAMEAnswer && rec.d_place == DNSResourceRecord::ANSWER && rec.d_type == QType::CNAME && (!(qtype==QType(QType::CNAME))) && rec.d_name == qname && !isDNAMEAnswer) { |
a82d4e27 RG |
2490 | isCNAMEAnswer = true; |
2491 | } | |
d30b5493 | 2492 | if(!isDNAMEAnswer && rec.d_place == DNSResourceRecord::ANSWER && rec.d_type == QType::DNAME && qtype != QType(QType::DNAME) && qname.isPartOf(rec.d_name)) { |
8838c88f | 2493 | isDNAMEAnswer = true; |
d30b5493 | 2494 | isCNAMEAnswer = false; |
8838c88f | 2495 | } |
a82d4e27 | 2496 | |
9b061cf5 RG |
2497 | /* if we have a positive answer synthetized from a wildcard, |
2498 | we need to store the corresponding NSEC/NSEC3 records proving | |
2499 | that the exact name did not exist in the negative cache */ | |
78cdf520 | 2500 | if(gatherWildcardProof) { |
2b984251 RG |
2501 | if (nsecTypes.count(rec.d_type)) { |
2502 | authorityRecs.push_back(std::make_shared<DNSRecord>(rec)); | |
2503 | } | |
2504 | else if (rec.d_type == QType::RRSIG) { | |
2505 | auto rrsig = getRR<RRSIGRecordContent>(rec); | |
2506 | if (rrsig && nsecTypes.count(rrsig->d_type)) { | |
2507 | authorityRecs.push_back(std::make_shared<DNSRecord>(rec)); | |
2508 | } | |
2509 | } | |
2510 | } | |
26ca3513 RG |
2511 | if(rec.d_type == QType::RRSIG) { |
2512 | auto rrsig = getRR<RRSIGRecordContent>(rec); | |
2513 | if (rrsig) { | |
bb07ad8e RG |
2514 | /* As illustrated in rfc4035's Appendix B.6, the RRSIG label |
2515 | count can be lower than the name's label count if it was | |
9b061cf5 | 2516 | synthetized from the wildcard. Note that the difference might |
bb07ad8e | 2517 | be > 1. */ |
78cdf520 RG |
2518 | if (rec.d_name == qname && isWildcardExpanded(labelCount, rrsig)) { |
2519 | gatherWildcardProof = true; | |
2520 | if (!isWildcardExpandedOntoItself(rec.d_name, labelCount, rrsig)) { | |
2521 | /* if we have a wildcard expanded onto itself, we don't need to prove | |
2522 | that the exact name doesn't exist because it actually does. | |
2523 | We still want to gather the corresponding NSEC/NSEC3 records | |
2524 | to pass them to our client in case it wants to validate by itself. | |
2525 | */ | |
2526 | LOG(prefix<<qname<<": RRSIG indicates the name was synthetized from a wildcard, we need a wildcard proof"<<endl); | |
2527 | needWildcardProof = true; | |
2528 | } | |
2529 | else { | |
2530 | LOG(prefix<<qname<<": RRSIG indicates the name was synthetized from a wildcard expanded onto itself, we need to gather wildcard proof"<<endl); | |
2531 | } | |
e4894ce0 | 2532 | wildcardLabelsCount = rrsig->d_labels; |
2b984251 RG |
2533 | } |
2534 | ||
26ca3513 RG |
2535 | // cerr<<"Got an RRSIG for "<<DNSRecordContent::NumberToType(rrsig->d_type)<<" with name '"<<rec.d_name<<"'"<<endl; |
2536 | tcache[{rec.d_name, rrsig->d_type, rec.d_place}].signatures.push_back(rrsig); | |
4d2be65d | 2537 | 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 |
2538 | } |
2539 | } | |
2540 | } | |
2541 | ||
2542 | // reap all answers from this packet that are acceptable | |
2543 | for(auto& rec : lwr.d_records) { | |
2544 | if(rec.d_type == QType::OPT) { | |
2545 | LOG(prefix<<qname<<": OPT answer '"<<rec.d_name<<"' from '"<<auth<<"' nameservers" <<endl); | |
2546 | continue; | |
2547 | } | |
e77f01d1 | 2548 | 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 | 2549 | if(rec.d_type == QType::ANY) { |
c5310862 RG |
2550 | LOG("NO! - we don't accept 'ANY'-typed data"<<endl); |
2551 | continue; | |
2552 | } | |
2553 | ||
2554 | if(rec.d_class != QClass::IN) { | |
2555 | LOG("NO! - we don't accept records for any other class than 'IN'"<<endl); | |
26ca3513 RG |
2556 | continue; |
2557 | } | |
2558 | ||
70ea0c65 | 2559 | if (!(lwr.d_aabit || wasForwardRecurse) && rec.d_place == DNSResourceRecord::ANSWER) { |
9870af40 RG |
2560 | /* for now we allow a CNAME for the exact qname in ANSWER with AA=0, because Amazon DNS servers |
2561 | are sending such responses */ | |
2562 | if (!(rec.d_type == QType::CNAME && rec.d_name == qname)) { | |
2563 | LOG("NO! - we don't accept records in the answers section without the AA bit set"<<endl); | |
2564 | continue; | |
2565 | } | |
70ea0c65 RG |
2566 | } |
2567 | ||
26ca3513 RG |
2568 | if(rec.d_name.isPartOf(auth)) { |
2569 | if(rec.d_type == QType::RRSIG) { | |
2570 | LOG("RRSIG - separate"<<endl); | |
2571 | } | |
4d2be65d | 2572 | 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 |
2573 | LOG("NO! Is from delegation-only zone"<<endl); |
2574 | s_nodelegated++; | |
2575 | return RCode::NXDomain; | |
2576 | } | |
2577 | else { | |
2578 | bool haveLogged = false; | |
d30b5493 PL |
2579 | if (isDNAMEAnswer && rec.d_type == QType::CNAME) { |
2580 | LOG("NO - we already have a DNAME answer for this domain"); | |
2581 | continue; | |
2582 | } | |
a712cb56 | 2583 | if (!t_sstorage.domainmap->empty()) { |
26ca3513 RG |
2584 | // Check if we are authoritative for a zone in this answer |
2585 | DNSName tmp_qname(rec.d_name); | |
2586 | auto auth_domain_iter=getBestAuthZone(&tmp_qname); | |
a712cb56 | 2587 | if(auth_domain_iter!=t_sstorage.domainmap->end() && |
26ca3513 RG |
2588 | auth.countLabels() <= auth_domain_iter->first.countLabels()) { |
2589 | if (auth_domain_iter->first != auth) { | |
2590 | LOG("NO! - we are authoritative for the zone "<<auth_domain_iter->first<<endl); | |
2591 | continue; | |
2592 | } else { | |
2593 | LOG("YES! - This answer was "); | |
6dfff36f | 2594 | if (!wasForwarded) { |
26ca3513 RG |
2595 | LOG("retrieved from the local auth store."); |
2596 | } else { | |
2597 | LOG("received from a server we forward to."); | |
2598 | } | |
2599 | haveLogged = true; | |
2600 | LOG(endl); | |
2601 | } | |
2602 | } | |
2603 | } | |
2604 | if (!haveLogged) { | |
2605 | LOG("YES!"<<endl); | |
2606 | } | |
2607 | ||
2608 | rec.d_ttl=min(s_maxcachettl, rec.d_ttl); | |
2609 | ||
2610 | DNSRecord dr(rec); | |
26ca3513 | 2611 | dr.d_ttl += d_now.tv_sec; |
2b984251 | 2612 | dr.d_place=DNSResourceRecord::ANSWER; |
26ca3513 RG |
2613 | tcache[{rec.d_name,rec.d_type,rec.d_place}].records.push_back(dr); |
2614 | } | |
2615 | } | |
2616 | else | |
2617 | LOG("NO!"<<endl); | |
2618 | } | |
2619 | ||
2620 | // supplant | |
4d2be65d RG |
2621 | for(tcache_t::iterator i = tcache.begin(); i != tcache.end(); ++i) { |
2622 | 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) | |
2623 | uint32_t lowestTTD=computeLowestTTD(i->second.records, i->second.signatures, i->second.signaturesTTL); | |
26ca3513 RG |
2624 | |
2625 | for(auto& record : i->second.records) | |
4d2be65d | 2626 | record.d_ttl = lowestTTD; // boom |
26ca3513 RG |
2627 | } |
2628 | ||
2629 | // cout<<"Have "<<i->second.records.size()<<" records and "<<i->second.signatures.size()<<" signatures for "<<i->first.name; | |
2630 | // cout<<'|'<<DNSRecordContent::NumberToType(i->first.type)<<endl; | |
4d2be65d RG |
2631 | } |
2632 | ||
2633 | for(tcache_t::iterator i = tcache.begin(); i != tcache.end(); ++i) { | |
4d2be65d | 2634 | |
26ca3513 RG |
2635 | if(i->second.records.empty()) // this happens when we did store signatures, but passed on the records themselves |
2636 | continue; | |
6dfff36f | 2637 | |
405a26bd RG |
2638 | /* Even if the AA bit is set, additional data cannot be considered |
2639 | as authoritative. This is especially important during validation | |
2640 | because keeping records in the additional section is allowed even | |
2641 | if the corresponding RRSIGs are not included, without setting the TC | |
2642 | bit, as stated in rfc4035's section 3.1.1. Including RRSIG RRs in a Response: | |
2643 | "When placing a signed RRset in the Additional section, the name | |
2644 | server MUST also place its RRSIG RRs in the Additional section. | |
2645 | If space does not permit inclusion of both the RRset and its | |
2646 | associated RRSIG RRs, the name server MAY retain the RRset while | |
2647 | dropping the RRSIG RRs. If this happens, the name server MUST NOT | |
2648 | set the TC bit solely because these RRSIG RRs didn't fit." | |
2649 | */ | |
2650 | bool isAA = lwr.d_aabit && i->first.place != DNSResourceRecord::ADDITIONAL; | |
dff3ef07 RG |
2651 | /* if we forwarded the query to a recursor, we can expect the answer to be signed, |
2652 | even if the answer is not AA. Of course that's not only true inside a Secure | |
2653 | zone, but we check that below. */ | |
70ea0c65 | 2654 | bool expectSignature = i->first.place == DNSResourceRecord::ANSWER || ((lwr.d_aabit || wasForwardRecurse) && i->first.place != DNSResourceRecord::ADDITIONAL); |
dff3ef07 | 2655 | if (isCNAMEAnswer && (i->first.place != DNSResourceRecord::ANSWER || i->first.type != QType::CNAME || i->first.name != qname)) { |
a82d4e27 RG |
2656 | /* |
2657 | rfc2181 states: | |
2658 | Note that the answer section of an authoritative answer normally | |
2659 | contains only authoritative data. However when the name sought is an | |
2660 | alias (see section 10.1.1) only the record describing that alias is | |
2661 | necessarily authoritative. Clients should assume that other records | |
2662 | may have come from the server's cache. Where authoritative answers | |
2663 | are required, the client should query again, using the canonical name | |
2664 | associated with the alias. | |
2665 | */ | |
2666 | isAA = false; | |
dff3ef07 | 2667 | expectSignature = false; |
a82d4e27 RG |
2668 | } |
2669 | ||
d9c32b52 RG |
2670 | if (isCNAMEAnswer && i->first.place == DNSResourceRecord::AUTHORITY && i->first.type == QType::NS && auth == i->first.name) { |
2671 | /* These NS can't be authoritative since we have a CNAME answer for which (see above) only the | |
2672 | record describing that alias is necessarily authoritative. | |
2673 | But if we allow the current auth, which might be serving the child zone, to raise the TTL | |
2674 | of non-authoritative NS in the cache, they might be able to keep a "ghost" zone alive forever, | |
2675 | even after the delegation is gone from the parent. | |
2676 | So let's just do nothing with them, we can fetch them directly if we need them. | |
2677 | */ | |
2678 | LOG(d_prefix<<": skipping authority NS from '"<<auth<<"' nameservers in CNAME answer "<<i->first.name<<"|"<<DNSRecordContent::NumberToType(i->first.type)<<endl); | |
2679 | continue; | |
2680 | } | |
2681 | ||
5374b03b | 2682 | vState recordState = getValidationStatus(i->first.name, false); |
1a8d6a9e | 2683 | LOG(d_prefix<<": got initial zone status "<<vStates[recordState]<<" for record "<<i->first.name<<"|"<<DNSRecordContent::NumberToType(i->first.type)<<endl); |
70b3fe7a | 2684 | |
e1636f82 | 2685 | if (shouldValidate() && recordState == Secure) { |
5374b03b RG |
2686 | vState initialState = recordState; |
2687 | ||
dff3ef07 | 2688 | if (expectSignature) { |
4d2be65d RG |
2689 | if (i->first.place != DNSResourceRecord::ADDITIONAL) { |
2690 | /* the additional entries can be insecure, | |
2691 | like glue: | |
2692 | "Glue address RRsets associated with delegations MUST NOT be signed" | |
2693 | */ | |
2694 | if (i->first.type == QType::DNSKEY && i->first.place == DNSResourceRecord::ANSWER) { | |
bcb05770 | 2695 | LOG(d_prefix<<"Validating DNSKEY for "<<i->first.name<<endl); |
51b6b728 | 2696 | recordState = validateDNSKeys(i->first.name, i->second.records, i->second.signatures, depth); |
4d2be65d RG |
2697 | } |
2698 | else { | |
8838c88f PL |
2699 | /* |
2700 | * RFC 6672 section 5.3.1 | |
2701 | * In any response, a signed DNAME RR indicates a non-terminal | |
2702 | * redirection of the query. There might or might not be a server- | |
2703 | * synthesized CNAME in the answer section; if there is, the CNAME will | |
2704 | * never be signed. For a DNSSEC validator, verification of the DNAME | |
2705 | * RR and then that the CNAME was properly synthesized is sufficient | |
2706 | * proof. | |
2707 | * | |
2708 | * We do the synthesis check in processRecords, here we make sure we | |
2709 | * don't validate the CNAME. | |
2710 | */ | |
2711 | if (!(isDNAMEAnswer && i->first.type == QType::CNAME)) { | |
2712 | LOG(d_prefix<<"Validating non-additional record for "<<i->first.name<<endl); | |
2713 | recordState = validateRecordsWithSigs(depth, qname, qtype, i->first.name, i->second.records, i->second.signatures); | |
2714 | /* 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 */ | |
2715 | if (qtype == QType::NS && i->second.signatures.empty() && recordState == Bogus && haveExactValidationStatus(i->first.name) && getValidationStatus(i->first.name) == Indeterminate) { | |
2716 | recordState = Indeterminate; | |
2717 | } | |
0735b60f | 2718 | } |
4d2be65d RG |
2719 | } |
2720 | } | |
2721 | } | |
2722 | else { | |
933299e8 RG |
2723 | recordState = Indeterminate; |
2724 | ||
a82d4e27 | 2725 | /* in a non authoritative answer, we only care about the DS record (or lack of) */ |
88cb0fe0 | 2726 | if ((i->first.type == QType::DS || i->first.type == QType::NSEC || i->first.type == QType::NSEC3) && i->first.place == DNSResourceRecord::AUTHORITY) { |
bcb05770 | 2727 | LOG(d_prefix<<"Validating DS record for "<<i->first.name<<endl); |
51b6b728 | 2728 | recordState = validateRecordsWithSigs(depth, qname, qtype, i->first.name, i->second.records, i->second.signatures); |
4d2be65d RG |
2729 | } |
2730 | } | |
0735b60f | 2731 | |
dff3ef07 | 2732 | if (initialState == Secure && state != recordState && expectSignature) { |
5374b03b RG |
2733 | updateValidationState(state, recordState); |
2734 | } | |
4d2be65d RG |
2735 | } |
2736 | else { | |
e1636f82 | 2737 | if (shouldValidate()) { |
bcb05770 | 2738 | LOG(d_prefix<<"Skipping validation because the current state is "<<vStates[recordState]<<endl); |
4d2be65d RG |
2739 | } |
2740 | } | |
2741 | ||
b9473937 RG |
2742 | if (recordState == Bogus) { |
2743 | /* this is a TTD by now, be careful */ | |
2744 | for(auto& record : i->second.records) { | |
2745 | record.d_ttl = std::min(record.d_ttl, static_cast<uint32_t>(s_maxbogusttl + d_now.tv_sec)); | |
2746 | } | |
2747 | } | |
2748 | ||
005b4b98 RG |
2749 | /* We don't need to store NSEC3 records in the positive cache because: |
2750 | - we don't allow direct NSEC3 queries | |
2751 | - denial of existence proofs in wildcard expanded positive responses are stored in authorityRecs | |
2752 | - denial of existence proofs for negative responses are stored in the negative cache | |
a321baf9 RG |
2753 | We also don't want to cache non-authoritative data except for: |
2754 | - records coming from non forward-recurse servers (those will never be AA) | |
2755 | - DS (special case) | |
2756 | - NS, A and AAAA (used for infra queries) | |
005b4b98 | 2757 | */ |
a321baf9 | 2758 | if (i->first.type != QType::NSEC3 && (i->first.type == QType::DS || i->first.type == QType::NS || i->first.type == QType::A || i->first.type == QType::AAAA || isAA || wasForwardRecurse)) { |
e7861cc4 | 2759 | |
73d9bf3a OM |
2760 | bool doCache = true; |
2761 | if (i->first.place == DNSResourceRecord::ANSWER && ednsmask) { | |
2762 | // If ednsmask is relevant, we do not want to cache if the scope prefix length is large and TTL is small | |
2763 | if (SyncRes::s_ecscachelimitttl > 0) { | |
2764 | bool manyMaskBits = (ednsmask->isIpv4() && ednsmask->getBits() > SyncRes::s_ecsipv4cachelimit) || | |
e7861cc4 OM |
2765 | (ednsmask->isIpv6() && ednsmask->getBits() > SyncRes::s_ecsipv6cachelimit); |
2766 | ||
e7861cc4 OM |
2767 | if (manyMaskBits) { |
2768 | uint32_t minttl = UINT32_MAX; | |
2769 | for (const auto &it : i->second.records) { | |
2770 | if (it.d_ttl < minttl) | |
2771 | minttl = it.d_ttl; | |
2772 | } | |
2773 | bool ttlIsSmall = minttl < SyncRes::s_ecscachelimitttl + d_now.tv_sec; | |
2774 | if (ttlIsSmall) { | |
2775 | // Case: many bits and ttlIsSmall | |
2776 | doCache = false; | |
2777 | } | |
e7861cc4 | 2778 | } |
ed9019c9 | 2779 | } |
e7861cc4 OM |
2780 | } |
2781 | if (doCache) { | |
2782 | 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); | |
bdceeb7e | 2783 | } |
005b4b98 | 2784 | } |
6dfff36f | 2785 | |
26ca3513 RG |
2786 | if(i->first.place == DNSResourceRecord::ANSWER && ednsmask) |
2787 | d_wasVariable=true; | |
2788 | } | |
2789 | ||
2790 | return RCode::NoError; | |
2791 | } | |
2792 | ||
28364e4b | 2793 | void SyncRes::updateDenialValidationState(vState& neValidationState, const DNSName& neName, vState& state, const dState denialState, const dState expectedState, bool allowOptOut) |
4d2be65d | 2794 | { |
b25712fd | 2795 | if (denialState == expectedState) { |
28364e4b | 2796 | neValidationState = Secure; |
b25712fd RG |
2797 | } |
2798 | else { | |
142ab370 | 2799 | if (denialState == OPTOUT && allowOptOut) { |
28364e4b RG |
2800 | LOG(d_prefix<<"OPT-out denial found for "<<neName<<endl); |
2801 | neValidationState = Secure; | |
142ab370 | 2802 | return; |
4d2be65d | 2803 | } |
142ab370 | 2804 | else if (denialState == INSECURE) { |
28364e4b RG |
2805 | LOG(d_prefix<<"Insecure denial found for "<<neName<<", returning Insecure"<<endl); |
2806 | neValidationState = Insecure; | |
4d2be65d | 2807 | } |
142ab370 | 2808 | else { |
28364e4b RG |
2809 | LOG(d_prefix<<"Invalid denial found for "<<neName<<", returning Bogus, res="<<denialState<<", expectedState="<<expectedState<<endl); |
2810 | neValidationState = Bogus; | |
142ab370 | 2811 | } |
28364e4b | 2812 | updateValidationState(state, neValidationState); |
4d2be65d RG |
2813 | } |
2814 | } | |
2815 | ||
28364e4b | 2816 | dState SyncRes::getDenialValidationState(const NegCache::NegCacheEntry& ne, const vState state, const dState expectedState, bool referralToUnsigned) |
142ab370 RG |
2817 | { |
2818 | cspmap_t csp = harvestCSPFromNE(ne); | |
2819 | return getDenial(csp, ne.d_name, ne.d_qtype.getCode(), referralToUnsigned, expectedState == NXQTYPE); | |
2820 | } | |
2821 | ||
78cdf520 | 2822 | 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 bool gatherWildcardProof, const unsigned int wildcardLabelsCount) |
26ca3513 RG |
2823 | { |
2824 | bool done = false; | |
123da0f8 | 2825 | DNSName dnameTarget, dnameOwner; |
ee936074 | 2826 | uint32_t dnameTTL = 0; |
26ca3513 RG |
2827 | |
2828 | for(auto& rec : lwr.d_records) { | |
2829 | if (rec.d_type!=QType::OPT && rec.d_class!=QClass::IN) | |
2830 | continue; | |
2831 | ||
70ea0c65 | 2832 | if (rec.d_place==DNSResourceRecord::ANSWER && !(lwr.d_aabit || sendRDQuery)) { |
9870af40 RG |
2833 | /* for now we allow a CNAME for the exact qname in ANSWER with AA=0, because Amazon DNS servers |
2834 | are sending such responses */ | |
2835 | if (!(rec.d_type == QType::CNAME && rec.d_name == qname)) { | |
2836 | continue; | |
2837 | } | |
70ea0c65 RG |
2838 | } |
2839 | ||
26ca3513 RG |
2840 | if(rec.d_place==DNSResourceRecord::AUTHORITY && rec.d_type==QType::SOA && |
2841 | lwr.d_rcode==RCode::NXDomain && qname.isPartOf(rec.d_name) && rec.d_name.isPartOf(auth)) { | |
2842 | LOG(prefix<<qname<<": got negative caching indication for name '"<<qname<<"' (accept="<<rec.d_name.isPartOf(auth)<<"), newtarget='"<<newtarget<<"'"<<endl); | |
2843 | ||
2844 | rec.d_ttl = min(rec.d_ttl, s_maxnegttl); | |
2845 | if(newtarget.empty()) // only add a SOA if we're not going anywhere after this | |
2846 | ret.push_back(rec); | |
39ce10b2 | 2847 | |
114829cc RG |
2848 | NegCache::NegCacheEntry ne; |
2849 | ||
dbbef467 | 2850 | uint32_t lowestTTL = rec.d_ttl; |
9b061cf5 RG |
2851 | /* if we get an NXDomain answer with a CNAME, the name |
2852 | does exist but the target does not */ | |
2853 | ne.d_name = newtarget.empty() ? qname : newtarget; | |
114829cc RG |
2854 | ne.d_qtype = QType(0); // this encodes 'whole record' |
2855 | ne.d_auth = rec.d_name; | |
dbbef467 | 2856 | harvestNXRecords(lwr.d_records, ne, d_now.tv_sec, &lowestTTL); |
dbbef467 | 2857 | |
142ab370 RG |
2858 | if (state == Secure) { |
2859 | dState denialState = getDenialValidationState(ne, state, NXDOMAIN, false); | |
28364e4b | 2860 | updateDenialValidationState(ne.d_validationState, ne.d_name, state, denialState, NXDOMAIN, false); |
142ab370 RG |
2861 | } |
2862 | else { | |
2863 | ne.d_validationState = state; | |
2864 | } | |
114829cc | 2865 | |
b9473937 RG |
2866 | if (ne.d_validationState == Bogus) { |
2867 | lowestTTL = min(lowestTTL, s_maxbogusttl); | |
2868 | } | |
2869 | ||
2870 | ne.d_ttd = d_now.tv_sec + lowestTTL; | |
9b061cf5 RG |
2871 | /* if we get an NXDomain answer with a CNAME, let's not cache the |
2872 | target, even the server was authoritative for it, | |
2873 | and do an additional query for the CNAME target. | |
2874 | We have a regression test making sure we do exactly that. | |
2875 | */ | |
2876 | if(!wasVariable() && newtarget.empty()) { | |
a712cb56 | 2877 | t_sstorage.negcache.add(ne); |
2ef32aec | 2878 | if(s_rootNXTrust && ne.d_auth.isRoot() && auth.isRoot() && lwr.d_aabit) { |
9a1e060b | 2879 | ne.d_name = ne.d_name.getLastLabel(); |
a712cb56 | 2880 | t_sstorage.negcache.add(ne); |
26ca3513 RG |
2881 | } |
2882 | } | |
2883 | ||
2884 | negindic=true; | |
2885 | } | |
123da0f8 PL |
2886 | else if(rec.d_place==DNSResourceRecord::ANSWER && s_redirectionQTypes.count(rec.d_type) > 0 && // CNAME or DNAME answer |
2887 | s_redirectionQTypes.count(qtype.getCode()) == 0) { // But not in response to a CNAME or DNAME query | |
2888 | if (rec.d_type == QType::CNAME && rec.d_name == qname) { | |
ee936074 PL |
2889 | if (!dnameOwner.empty()) { // We synthesize ourselves |
2890 | continue; | |
2891 | } | |
123da0f8 PL |
2892 | ret.push_back(rec); |
2893 | if (auto content = getRR<CNAMERecordContent>(rec)) { | |
2894 | newtarget=content->getTarget(); | |
2895 | } | |
2896 | } else if (rec.d_type == QType::DNAME && qname.isPartOf(rec.d_name)) { // DNAME | |
2897 | ret.push_back(rec); | |
2898 | if (auto content = getRR<DNAMERecordContent>(rec)) { | |
2899 | dnameOwner = rec.d_name; | |
2900 | dnameTarget = content->getTarget(); | |
ee936074 | 2901 | dnameTTL = rec.d_ttl; |
29ec25aa PL |
2902 | if (!newtarget.empty()) { // We had a CNAME before, remove it from ret so we don't cache it |
2903 | ret.erase(std::remove_if( | |
2904 | ret.begin(), | |
2905 | ret.end(), | |
2906 | [&qname](DNSRecord& rr) { | |
2907 | return (rr.d_place == DNSResourceRecord::ANSWER && rr.d_type == QType::CNAME && rr.d_name == qname); | |
2908 | }), | |
2909 | ret.end()); | |
2910 | } | |
ee936074 PL |
2911 | try { |
2912 | newtarget = qname.makeRelative(dnameOwner) + dnameTarget; | |
2913 | } catch (const std::exception &e) { | |
2914 | // We should probably catch an std::range_error here and set the rcode to YXDOMAIN (RFC 6672, section 2.2) | |
2915 | // But there is no way to set the RCODE from this function | |
2916 | throw ImmediateServFailException("Unable to perform DNAME substitution(DNAME owner: '" + dnameOwner.toLogString() + | |
2917 | "', DNAME target: '" + dnameTarget.toLogString() + "', substituted name: '" + | |
2918 | qname.makeRelative(dnameOwner).toLogString() + "." + dnameTarget.toLogString() + | |
2919 | "' : " + e.what()); | |
2920 | } | |
123da0f8 | 2921 | } |
26ca3513 RG |
2922 | } |
2923 | } | |
9b061cf5 RG |
2924 | /* if we have a positive answer synthetized from a wildcard, we need to |
2925 | return the corresponding NSEC/NSEC3 records from the AUTHORITY section | |
2926 | proving that the exact name did not exist */ | |
78cdf520 | 2927 | else if(gatherWildcardProof && (rec.d_type==QType::RRSIG || rec.d_type==QType::NSEC || rec.d_type==QType::NSEC3) && rec.d_place==DNSResourceRecord::AUTHORITY) { |
2b984251 RG |
2928 | ret.push_back(rec); // enjoy your DNSSEC |
2929 | } | |
26ca3513 RG |
2930 | // for ANY answers we *must* have an authoritative answer, unless we are forwarding recursively |
2931 | else if(rec.d_place==DNSResourceRecord::ANSWER && rec.d_name == qname && | |
2932 | ( | |
331222c4 | 2933 | rec.d_type==qtype.getCode() || ((lwr.d_aabit || sendRDQuery) && qtype == QType(QType::ANY)) |
26ca3513 RG |
2934 | ) |
2935 | ) | |
2936 | { | |
2937 | LOG(prefix<<qname<<": answer is in: resolved to '"<< rec.d_content->getZoneRepresentation()<<"|"<<DNSRecordContent::NumberToType(rec.d_type)<<"'"<<endl); | |
2938 | ||
2939 | done=true; | |
9b061cf5 RG |
2940 | |
2941 | if (state == Secure && needWildcardProof) { | |
2942 | /* We have a positive answer synthetized from a wildcard, we need to check that we have | |
2943 | proof that the exact name doesn't exist so the wildcard can be used, | |
d0d39496 | 2944 | as described in section 5.3.4 of RFC 4035 and 5.3 of RFC 7129. |
9b061cf5 RG |
2945 | */ |
2946 | NegCache::NegCacheEntry ne; | |
2947 | ||
2948 | uint32_t lowestTTL = rec.d_ttl; | |
2949 | ne.d_name = qname; | |
2950 | ne.d_qtype = QType(0); // this encodes 'whole record' | |
2951 | harvestNXRecords(lwr.d_records, ne, d_now.tv_sec, &lowestTTL); | |
2952 | ||
2953 | cspmap_t csp = harvestCSPFromNE(ne); | |
e4894ce0 | 2954 | dState res = getDenial(csp, qname, ne.d_qtype.getCode(), false, false, false, wildcardLabelsCount); |
9b061cf5 | 2955 | if (res != NXDOMAIN) { |
b7c40613 RG |
2956 | vState st = Bogus; |
2957 | if (res == INSECURE) { | |
2958 | /* Some part could not be validated, for example a NSEC3 record with a too large number of iterations, | |
2959 | this is not enough to warrant a Bogus, but go Insecure. */ | |
2960 | st = Insecure; | |
2961 | LOG(d_prefix<<"Unable to validate denial in wildcard expanded positive response found for "<<qname<<", returning Insecure, res="<<res<<endl); | |
2962 | } | |
2963 | else { | |
2964 | LOG(d_prefix<<"Invalid denial in wildcard expanded positive response found for "<<qname<<", returning Bogus, res="<<res<<endl); | |
b9473937 | 2965 | rec.d_ttl = std::min(rec.d_ttl, s_maxbogusttl); |
b7c40613 RG |
2966 | } |
2967 | ||
2968 | updateValidationState(state, st); | |
2969 | /* we already stored the record with a different validation status, let's fix it */ | |
b9473937 | 2970 | updateValidationStatusInCache(qname, qtype, lwr.d_aabit, st); |
9b061cf5 RG |
2971 | } |
2972 | } | |
b9473937 | 2973 | ret.push_back(rec); |
26ca3513 | 2974 | } |
7030a59b | 2975 | else if((rec.d_type==QType::RRSIG || rec.d_type==QType::NSEC || rec.d_type==QType::NSEC3) && rec.d_place==DNSResourceRecord::ANSWER) { |
123da0f8 | 2976 | if(rec.d_type != QType::RRSIG || rec.d_name == qname) { |
7030a59b | 2977 | ret.push_back(rec); // enjoy your DNSSEC |
123da0f8 PL |
2978 | } else if(rec.d_type == QType::RRSIG && qname.isPartOf(rec.d_name)) { |
2979 | auto rrsig = getRR<RRSIGRecordContent>(rec); | |
2980 | if (rrsig != nullptr && rrsig->d_type == QType::DNAME) { | |
2981 | ret.push_back(rec); | |
2982 | } | |
2983 | } | |
7030a59b | 2984 | } |
4d2be65d | 2985 | else if(rec.d_place==DNSResourceRecord::AUTHORITY && rec.d_type==QType::NS && qname.isPartOf(rec.d_name)) { |
26ca3513 RG |
2986 | if(moreSpecificThan(rec.d_name,auth)) { |
2987 | newauth=rec.d_name; | |
2988 | LOG(prefix<<qname<<": got NS record '"<<rec.d_name<<"' -> '"<<rec.d_content->getZoneRepresentation()<<"'"<<endl); | |
2989 | realreferral=true; | |
2990 | } | |
2991 | else { | |
2992 | LOG(prefix<<qname<<": got upwards/level NS record '"<<rec.d_name<<"' -> '"<<rec.d_content->getZoneRepresentation()<<"', had '"<<auth<<"'"<<endl); | |
2993 | } | |
2994 | if (auto content = getRR<NSRecordContent>(rec)) { | |
2995 | nsset.insert(content->getNS()); | |
2996 | } | |
2997 | } | |
4d2be65d | 2998 | else if(rec.d_place==DNSResourceRecord::AUTHORITY && rec.d_type==QType::DS && qname.isPartOf(rec.d_name)) { |
26ca3513 | 2999 | LOG(prefix<<qname<<": got DS record '"<<rec.d_name<<"' -> '"<<rec.d_content->getZoneRepresentation()<<"'"<<endl); |
26ca3513 | 3000 | } |
860d5e8e | 3001 | else if(realreferral && rec.d_place==DNSResourceRecord::AUTHORITY && (rec.d_type==QType::NSEC || rec.d_type==QType::NSEC3) && newauth.isPartOf(auth)) { |
4d2be65d RG |
3002 | /* we might have received a denial of the DS, let's check */ |
3003 | if (state == Secure) { | |
3004 | NegCache::NegCacheEntry ne; | |
3005 | ne.d_auth = auth; | |
860d5e8e RG |
3006 | ne.d_name = newauth; |
3007 | ne.d_qtype = QType::DS; | |
dbbef467 RG |
3008 | rec.d_ttl = min(s_maxnegttl, rec.d_ttl); |
3009 | uint32_t lowestTTL = rec.d_ttl; | |
3010 | harvestNXRecords(lwr.d_records, ne, d_now.tv_sec, &lowestTTL); | |
3011 | ||
142ab370 RG |
3012 | dState denialState = getDenialValidationState(ne, state, NXQTYPE, true); |
3013 | ||
d377bb54 | 3014 | if (denialState == NXQTYPE || denialState == OPTOUT || denialState == INSECURE) { |
dbbef467 | 3015 | ne.d_ttd = lowestTTL + d_now.tv_sec; |
860d5e8e | 3016 | ne.d_validationState = Secure; |
812c3a69 | 3017 | LOG(prefix<<qname<<": got negative indication of DS record for '"<<newauth<<"'"<<endl); |
5374b03b | 3018 | |
4d2be65d RG |
3019 | if(!wasVariable()) { |
3020 | t_sstorage.negcache.add(ne); | |
3021 | } | |
5374b03b RG |
3022 | |
3023 | if (qname == newauth && qtype == QType::DS) { | |
3024 | /* we are actually done! */ | |
3025 | negindic=true; | |
3026 | nsset.clear(); | |
3027 | } | |
4d2be65d RG |
3028 | } |
3029 | } | |
3030 | } | |
3031 | else if(!done && rec.d_place==DNSResourceRecord::AUTHORITY && rec.d_type==QType::SOA && | |
3032 | lwr.d_rcode==RCode::NoError && qname.isPartOf(rec.d_name)) { | |
26ca3513 RG |
3033 | LOG(prefix<<qname<<": got negative caching indication for '"<< qname<<"|"<<qtype.getName()<<"'"<<endl); |
3034 | ||
3035 | if(!newtarget.empty()) { | |
3036 | LOG(prefix<<qname<<": Hang on! Got a redirect to '"<<newtarget<<"' already"<<endl); | |
3037 | } | |
3038 | else { | |
3039 | rec.d_ttl = min(s_maxnegttl, rec.d_ttl); | |
114829cc RG |
3040 | |
3041 | NegCache::NegCacheEntry ne; | |
3042 | ne.d_auth = rec.d_name; | |
dbbef467 | 3043 | uint32_t lowestTTL = rec.d_ttl; |
114829cc RG |
3044 | ne.d_name = qname; |
3045 | ne.d_qtype = qtype; | |
dbbef467 | 3046 | harvestNXRecords(lwr.d_records, ne, d_now.tv_sec, &lowestTTL); |
dbbef467 | 3047 | |
142ab370 RG |
3048 | if (state == Secure) { |
3049 | dState denialState = getDenialValidationState(ne, state, NXQTYPE, false); | |
28364e4b | 3050 | updateDenialValidationState(ne.d_validationState, ne.d_name, state, denialState, NXQTYPE, qtype == QType::DS); |
142ab370 RG |
3051 | } else { |
3052 | ne.d_validationState = state; | |
3053 | } | |
114829cc | 3054 | |
b9473937 RG |
3055 | if (ne.d_validationState == Bogus) { |
3056 | lowestTTL = min(lowestTTL, s_maxbogusttl); | |
3057 | rec.d_ttl = min(rec.d_ttl, s_maxbogusttl); | |
3058 | } | |
3059 | ne.d_ttd = d_now.tv_sec + lowestTTL; | |
3060 | ||
26ca3513 | 3061 | if(!wasVariable()) { |
26ca3513 | 3062 | if(qtype.getCode()) { // prevents us from blacking out a whole domain |
a712cb56 | 3063 | t_sstorage.negcache.add(ne); |
26ca3513 RG |
3064 | } |
3065 | } | |
b9473937 RG |
3066 | |
3067 | ret.push_back(rec); | |
26ca3513 RG |
3068 | negindic=true; |
3069 | } | |
3070 | } | |
3071 | } | |
3072 | ||
ee936074 PL |
3073 | if (!dnameTarget.empty()) { |
3074 | // Synthesize a CNAME | |
3075 | auto cnamerec = DNSRecord(); | |
3076 | cnamerec.d_name = qname; | |
3077 | cnamerec.d_type = QType::CNAME; | |
3078 | cnamerec.d_ttl = dnameTTL; | |
3079 | cnamerec.d_content = std::make_shared<CNAMERecordContent>(CNAMERecordContent(newtarget)); | |
3080 | ret.push_back(cnamerec); | |
123da0f8 | 3081 | } |
26ca3513 RG |
3082 | return done; |
3083 | } | |
3084 | ||
6dfff36f RG |
3085 | 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) |
3086 | { | |
deca7d8f | 3087 | bool chained = false; |
17cecc84 | 3088 | int resolveret = RCode::NoError; |
6dfff36f RG |
3089 | s_outqueries++; |
3090 | d_outqueries++; | |
3091 | ||
3092 | if(d_outqueries + d_throttledqueries > s_maxqperq) { | |
3093 | throw ImmediateServFailException("more than "+std::to_string(s_maxqperq)+" (max-qperq) queries sent while resolving "+qname.toLogString()); | |
3094 | } | |
3095 | ||
3096 | if(s_maxtotusec && d_totUsec > s_maxtotusec) { | |
3097 | 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"); | |
3098 | } | |
3099 | ||
3100 | if(doTCP) { | |
3101 | LOG(prefix<<qname<<": using TCP with "<< remoteIP.toStringWithPort() <<endl); | |
3102 | s_tcpoutqueries++; | |
3103 | d_tcpoutqueries++; | |
3104 | } | |
3105 | ||
3106 | if(d_pdl && d_pdl->preoutquery(remoteIP, d_requestor, qname, qtype, doTCP, lwr.d_records, resolveret)) { | |
3107 | LOG(prefix<<qname<<": query handled by Lua"<<endl); | |
3108 | } | |
3109 | else { | |
2fe3354d | 3110 | ednsmask=getEDNSSubnetMask(qname, remoteIP); |
6dfff36f RG |
3111 | if(ednsmask) { |
3112 | LOG(prefix<<qname<<": Adding EDNS Client Subnet Mask "<<ednsmask->toString()<<" to query"<<endl); | |
d6923beb | 3113 | s_ecsqueries++; |
6dfff36f | 3114 | } |
6de48f75 | 3115 | resolveret = asyncresolveWrapper(remoteIP, d_doDNSSEC, qname, auth, qtype.getCode(), |
deca7d8f | 3116 | doTCP, sendRDQuery, &d_now, ednsmask, &lwr, &chained); // <- we go out on the wire! |
6dfff36f | 3117 | if(ednsmask) { |
d6923beb | 3118 | s_ecsresponses++; |
6dfff36f | 3119 | LOG(prefix<<qname<<": Received EDNS Client Subnet Mask "<<ednsmask->toString()<<" on response"<<endl); |
c9783016 RG |
3120 | if (ednsmask->getBits() > 0) { |
3121 | if (ednsmask->isIpv4()) { | |
3122 | ++SyncRes::s_ecsResponsesBySubnetSize4.at(ednsmask->getBits()-1); | |
3123 | } | |
3124 | else { | |
3125 | ++SyncRes::s_ecsResponsesBySubnetSize6.at(ednsmask->getBits()-1); | |
3126 | } | |
3127 | } | |
6dfff36f RG |
3128 | } |
3129 | } | |
3130 | ||
3131 | /* preoutquery killed the query by setting dq.rcode to -3 */ | |
3132 | if(resolveret==-3) { | |
3133 | throw ImmediateServFailException("Query killed by policy"); | |
3134 | } | |
3135 | ||
3136 | d_totUsec += lwr.d_usec; | |
3137 | accountAuthLatency(lwr.d_usec, remoteIP.sin4.sin_family); | |
3138 | ||
5c8c72bf PL |
3139 | bool dontThrottle = false; |
3140 | { | |
3141 | auto dontThrottleNames = g_dontThrottleNames.getLocal(); | |
3142 | auto dontThrottleNetmasks = g_dontThrottleNetmasks.getLocal(); | |
3143 | dontThrottle = dontThrottleNames->check(nsName) || dontThrottleNetmasks->match(remoteIP); | |
3144 | } | |
3145 | ||
6dfff36f RG |
3146 | if(resolveret != 1) { |
3147 | /* Error while resolving */ | |
3148 | if(resolveret == 0) { | |
3149 | /* Time out */ | |
3150 | ||
3151 | LOG(prefix<<qname<<": timeout resolving after "<<lwr.d_usec/1000.0<<"msec "<< (doTCP ? "over TCP" : "")<<endl); | |
3152 | d_timeouts++; | |
3153 | s_outgoingtimeouts++; | |
3154 | ||
3155 | if(remoteIP.sin4.sin_family == AF_INET) | |
3156 | s_outgoing4timeouts++; | |
3157 | else | |
3158 | s_outgoing6timeouts++; | |
be9078b3 | 3159 | |
3160 | if(t_timeouts) | |
3161 | t_timeouts->push_back(remoteIP); | |
6dfff36f RG |
3162 | } |
3163 | else if(resolveret == -2) { | |
3164 | /* OS resource limit reached */ | |
3165 | LOG(prefix<<qname<<": hit a local resource limit resolving"<< (doTCP ? " over TCP" : "")<<", probable error: "<<stringerror()<<endl); | |
3166 | g_stats.resourceLimits++; | |
3167 | } | |
3168 | else { | |
3169 | /* -1 means server unreachable */ | |
3170 | s_unreachables++; | |
3171 | d_unreachables++; | |
a702a96c OM |
3172 | // XXX questionable use of errno |
3173 | LOG(prefix<<qname<<": error resolving from "<<remoteIP.toString()<< (doTCP ? " over TCP" : "") <<", possible error: "<<stringerror()<< endl); | |
6dfff36f RG |
3174 | } |
3175 | ||
5c8c72bf | 3176 | if(resolveret != -2 && !chained && !dontThrottle) { |
559b6c93 PL |
3177 | // don't account for resource limits, they are our own fault |
3178 | // And don't throttle when the IP address is on the dontThrottleNetmasks list or the name is part of dontThrottleNames | |
589884b8 | 3179 | t_sstorage.nsSpeeds[nsName.empty()? DNSName(remoteIP.toStringWithPort()) : nsName].submit(remoteIP, 1000000, &d_now); // 1 sec |
6dfff36f RG |
3180 | |
3181 | // code below makes sure we don't filter COM or the root | |
60e5208a | 3182 | if (s_serverdownmaxfails > 0 && (auth != g_rootdnsname) && t_sstorage.fails.incr(remoteIP, d_now) >= s_serverdownmaxfails) { |
6dfff36f RG |
3183 | LOG(prefix<<qname<<": Max fails reached resolving on "<< remoteIP.toString() <<". Going full throttle for "<< s_serverdownthrottletime <<" seconds" <<endl); |
3184 | // mark server as down | |
3185 | t_sstorage.throttle.throttle(d_now.tv_sec, boost::make_tuple(remoteIP, "", 0), s_serverdownthrottletime, 10000); | |
3186 | } | |
3187 | else if (resolveret == -1) { | |
3188 | // unreachable, 1 minute or 100 queries | |
3189 | t_sstorage.throttle.throttle(d_now.tv_sec, boost::make_tuple(remoteIP, qname, qtype.getCode()), 60, 100); | |
3190 | } | |
3191 | else { | |
559b6c93 | 3192 | // timeout, 10 seconds or 5 queries |
6dfff36f RG |
3193 | t_sstorage.throttle.throttle(d_now.tv_sec, boost::make_tuple(remoteIP, qname, qtype.getCode()), 10, 5); |
3194 | } | |
3195 | } | |
3196 | ||
3197 | return false; | |
3198 | } | |
3199 | ||
3200 | /* we got an answer */ | |
3201 | if(lwr.d_rcode==RCode::ServFail || lwr.d_rcode==RCode::Refused) { | |
3202 | LOG(prefix<<qname<<": "<<nsName<<" ("<<remoteIP.toString()<<") returned a "<< (lwr.d_rcode==RCode::ServFail ? "ServFail" : "Refused") << ", trying sibling IP or NS"<<endl); | |
5c8c72bf | 3203 | if (!chained && !dontThrottle) { |
deca7d8f RG |
3204 | t_sstorage.throttle.throttle(d_now.tv_sec, boost::make_tuple(remoteIP, qname, qtype.getCode()), 60, 3); |
3205 | } | |
6dfff36f RG |
3206 | return false; |
3207 | } | |
3208 | ||
3209 | /* this server sent a valid answer, mark it backup up if it was down */ | |
3210 | if(s_serverdownmaxfails > 0) { | |
3211 | t_sstorage.fails.clear(remoteIP); | |
3212 | } | |
3213 | ||
3214 | if(lwr.d_tcbit) { | |
3215 | *truncated = true; | |
3216 | ||
4ab4187c | 3217 | if (doTCP) { |
6dfff36f | 3218 | LOG(prefix<<qname<<": truncated bit set, over TCP?"<<endl); |
4ab4187c PD |
3219 | if (!dontThrottle) { |
3220 | /* let's treat that as a ServFail answer from this server */ | |
3221 | t_sstorage.throttle.throttle(d_now.tv_sec, boost::make_tuple(remoteIP, qname, qtype.getCode()), 60, 3); | |
3222 | } | |
6dfff36f RG |
3223 | return false; |
3224 | } | |
b1f2295b | 3225 | LOG(prefix<<qname<<": truncated bit set, over UDP"<<endl); |
6dfff36f RG |
3226 | |
3227 | return true; | |
3228 | } | |
3229 | ||
3230 | return true; | |
3231 | } | |
3232 | ||
51b6b728 | 3233 | 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 |
3234 | { |
3235 | string prefix; | |
3236 | if(doLog()) { | |
3237 | prefix=d_prefix; | |
3238 | prefix.append(depth, ' '); | |
3239 | } | |
3240 | ||
3241 | if(s_minimumTTL) { | |
3242 | for(auto& rec : lwr.d_records) { | |
3243 | rec.d_ttl = max(rec.d_ttl, s_minimumTTL); | |
3244 | } | |
3245 | } | |
3246 | ||
5cf4b2e7 RG |
3247 | /* if the answer is ECS-specific, a minimum TTL is set for this kind of answers |
3248 | and it's higher than the global minimum TTL */ | |
3249 | if (ednsmask && s_minimumECSTTL > 0 && (s_minimumTTL == 0 || s_minimumECSTTL > s_minimumTTL)) { | |
3250 | for(auto& rec : lwr.d_records) { | |
3251 | if (rec.d_place == DNSResourceRecord::ANSWER) { | |
3252 | rec.d_ttl = max(rec.d_ttl, s_minimumECSTTL); | |
3253 | } | |
3254 | } | |
3255 | } | |
3256 | ||
2b984251 | 3257 | bool needWildcardProof = false; |
78cdf520 | 3258 | bool gatherWildcardProof = false; |
e4894ce0 | 3259 | unsigned int wildcardLabelsCount; |
78cdf520 | 3260 | *rcode = updateCacheFromRecords(depth, lwr, qname, qtype, auth, wasForwarded, ednsmask, state, needWildcardProof, gatherWildcardProof, wildcardLabelsCount, sendRDQuery); |
6dfff36f RG |
3261 | if (*rcode != RCode::NoError) { |
3262 | return true; | |
3263 | } | |
3264 | ||
3265 | LOG(prefix<<qname<<": determining status after receiving this packet"<<endl); | |
3266 | ||
3267 | set<DNSName> nsset; | |
3268 | bool realreferral=false, negindic=false; | |
3269 | DNSName newauth; | |
3270 | DNSName newtarget; | |
3271 | ||
78cdf520 | 3272 | bool done = processRecords(prefix, qname, qtype, auth, lwr, sendRDQuery, ret, nsset, newtarget, newauth, realreferral, negindic, state, needWildcardProof, gatherWildcardProof, wildcardLabelsCount); |
6dfff36f RG |
3273 | |
3274 | if(done){ | |
3275 | LOG(prefix<<qname<<": status=got results, this level of recursion done"<<endl); | |
5374b03b | 3276 | LOG(prefix<<qname<<": validation status is "<<vStates[state]<<endl); |
6dfff36f RG |
3277 | *rcode = RCode::NoError; |
3278 | return true; | |
3279 | } | |
3280 | ||
3281 | if(!newtarget.empty()) { | |
3282 | if(newtarget == qname) { | |
3283 | LOG(prefix<<qname<<": status=got a CNAME referral to self, returning SERVFAIL"<<endl); | |
3284 | *rcode = RCode::ServFail; | |
3285 | return true; | |
3286 | } | |
3287 | ||
3288 | if(depth > 10) { | |
3289 | LOG(prefix<<qname<<": status=got a CNAME referral, but recursing too deep, returning SERVFAIL"<<endl); | |
3290 | *rcode = RCode::ServFail; | |
3291 | return true; | |
3292 | } | |
3293 | ||
5374b03b RG |
3294 | if (qtype == QType::DS) { |
3295 | LOG(prefix<<qname<<": status=got a CNAME referral, but we are looking for a DS"<<endl); | |
6dfff36f | 3296 | |
1c39e884 RG |
3297 | if(d_doDNSSEC) |
3298 | addNXNSECS(ret, lwr.d_records); | |
3299 | ||
3300 | *rcode = RCode::NoError; | |
3301 | return true; | |
5374b03b RG |
3302 | } |
3303 | else { | |
3304 | LOG(prefix<<qname<<": status=got a CNAME referral, starting over with "<<newtarget<<endl); | |
6dfff36f | 3305 | |
5374b03b RG |
3306 | set<GetBestNSAnswer> beenthere2; |
3307 | vState cnameState = Indeterminate; | |
3308 | *rcode = doResolve(newtarget, qtype, ret, depth + 1, beenthere2, cnameState); | |
3309 | LOG(prefix<<qname<<": updating validation state for response to "<<qname<<" from "<<vStates[state]<<" with the state from the CNAME quest: "<<vStates[cnameState]<<endl); | |
3310 | updateValidationState(state, cnameState); | |
3311 | return true; | |
3312 | } | |
6dfff36f RG |
3313 | } |
3314 | ||
3315 | if(lwr.d_rcode == RCode::NXDomain) { | |
3316 | LOG(prefix<<qname<<": status=NXDOMAIN, we are done "<<(negindic ? "(have negative SOA)" : "")<<endl); | |
3317 | ||
3318 | if(d_doDNSSEC) | |
3319 | addNXNSECS(ret, lwr.d_records); | |
3320 | ||
3321 | *rcode = RCode::NXDomain; | |
3322 | return true; | |
3323 | } | |
3324 | ||
3325 | if(nsset.empty() && !lwr.d_rcode && (negindic || lwr.d_aabit || sendRDQuery)) { | |
3326 | LOG(prefix<<qname<<": status=noerror, other types may exist, but we are done "<<(negindic ? "(have negative SOA) " : "")<<(lwr.d_aabit ? "(have aa bit) " : "")<<endl); | |
3327 | ||
6e9d3cae | 3328 | if(state == Secure && (lwr.d_aabit || sendRDQuery) && !negindic) { |
114829cc RG |
3329 | updateValidationState(state, Bogus); |
3330 | } | |
3331 | ||
6dfff36f RG |
3332 | if(d_doDNSSEC) |
3333 | addNXNSECS(ret, lwr.d_records); | |
3334 | ||
3335 | *rcode = RCode::NoError; | |
3336 | return true; | |
3337 | } | |
3338 | ||
3339 | if(realreferral) { | |
3340 | LOG(prefix<<qname<<": status=did not resolve, got "<<(unsigned int)nsset.size()<<" NS, "); | |
6dfff36f RG |
3341 | |
3342 | nameservers.clear(); | |
3343 | for (auto const &nameserver : nsset) { | |
3344 | if (d_wantsRPZ) { | |
3345 | d_appliedPolicy = dfe.getProcessingPolicy(nameserver, d_discardedPolicies); | |
3346 | if (d_appliedPolicy.d_kind != DNSFilterEngine::PolicyKind::NoAction) { // client query needs an RPZ response | |
3347 | LOG("however "<<nameserver<<" was blocked by RPZ policy '"<<(d_appliedPolicy.d_name ? *d_appliedPolicy.d_name : "")<<"'"<<endl); | |
3348 | *rcode = -2; | |
3349 | return true; | |
3350 | } | |
3351 | } | |
3352 | nameservers.insert({nameserver, {{}, false}}); | |
3353 | } | |
3354 | LOG("looping to them"<<endl); | |
3355 | *gotNewServers = true; | |
812c3a69 | 3356 | auth=newauth; |
4d2be65d | 3357 | |
6dfff36f RG |
3358 | return false; |
3359 | } | |
3360 | ||
3361 | return false; | |
3362 | } | |
3363 | ||
b8470add PL |
3364 | /** returns: |
3365 | * -1 in case of no results | |
3366 | * -2 when a FilterEngine Policy was hit | |
3367 | * rcode otherwise | |
3368 | */ | |
fa1b87ff | 3369 | int SyncRes::doResolveAt(NsSet &nameservers, DNSName auth, bool flawedNSSet, const DNSName &qname, const QType &qtype, |
e325f20c | 3370 | vector<DNSRecord>&ret, |
116d1288 | 3371 | unsigned int depth, set<GetBestNSAnswer>&beenthere, vState& state, StopAtDelegation* stopAtDelegation) |
86c152f2 | 3372 | { |
69cbdef9 | 3373 | auto luaconfsLocal = g_luaconfs.getLocal(); |
ded77b10 | 3374 | string prefix; |
77499b05 | 3375 | if(doLog()) { |
ded77b10 BH |
3376 | prefix=d_prefix; |
3377 | prefix.append(depth, ' '); | |
3378 | } | |
3ddb9247 | 3379 | |
b8470add PL |
3380 | LOG(prefix<<qname<<": Cache consultations done, have "<<(unsigned int)nameservers.size()<<" NS to contact"); |
3381 | ||
69cbdef9 | 3382 | if (nameserversBlockedByRPZ(luaconfsLocal->dfe, nameservers)) { |
26ca3513 | 3383 | return -2; |
b8470add PL |
3384 | } |
3385 | ||
3386 | LOG(endl); | |
afbe2787 BH |
3387 | |
3388 | for(;;) { // we may get more specific nameservers | |
feccaf7f | 3389 | auto rnameservers = shuffleInSpeedOrder(nameservers, doLog() ? (prefix+qname.toString()+": ") : string() ); |
3ddb9247 | 3390 | |
26ca3513 RG |
3391 | for(auto tns=rnameservers.cbegin();;++tns) { |
3392 | if(tns==rnameservers.cend()) { | |
2189085d | 3393 | LOG(prefix<<qname<<": Failed to resolve via any of the "<<(unsigned int)rnameservers.size()<<" offered NS at level '"<<auth<<"'"<<endl); |
03c09afe | 3394 | if(!auth.isRoot() && flawedNSSet) { |
2189085d | 3395 | LOG(prefix<<qname<<": Ageing nameservers for level '"<<auth<<"', next query might succeed"<<endl); |
88490c03 | 3396 | |
49a699c4 | 3397 | if(t_RC->doAgeCache(d_now.tv_sec, auth, QType::NS, 10)) |
4957a608 BH |
3398 | g_stats.nsSetInvalidations++; |
3399 | } | |
3400 | return -1; | |
afbe2787 | 3401 | } |
6dfff36f | 3402 | |
b4c8789a RG |
3403 | bool cacheOnly = false; |
3404 | // this line needs to identify the 'self-resolving' behaviour | |
feccaf7f | 3405 | if(qname == tns->first && (qtype.getCode() == QType::A || qtype.getCode() == QType::AAAA)) { |
b4c8789a RG |
3406 | /* we might have a glue entry in cache so let's try this NS |
3407 | but only if we have enough in the cache to know how to reach it */ | |
3408 | LOG(prefix<<qname<<": Using NS to resolve itself, but only using what we have in cache ("<<(1+tns-rnameservers.cbegin())<<"/"<<rnameservers.size()<<")"<<endl); | |
3409 | cacheOnly = true; | |
20177d1d | 3410 | } |
5605c067 | 3411 | |
996c89cc | 3412 | typedef vector<ComboAddress> remoteIPs_t; |
5605c067 | 3413 | remoteIPs_t remoteIPs; |
bfea0d0b | 3414 | remoteIPs_t::const_iterator remoteIP; |
1c21f389 | 3415 | bool pierceDontQuery=false; |
c1d73d94 | 3416 | bool sendRDQuery=false; |
376effcf | 3417 | boost::optional<Netmask> ednsmask; |
263f6a5a | 3418 | LWResult lwr; |
feccaf7f | 3419 | const bool wasForwarded = tns->first.empty() && (!nameservers[tns->first].first.empty()); |
6dfff36f RG |
3420 | int rcode = RCode::NoError; |
3421 | bool gotNewServers = false; | |
3422 | ||
feccaf7f | 3423 | if(tns->first.empty() && !wasForwarded) { |
2189085d | 3424 | LOG(prefix<<qname<<": Domain is out-of-band"<<endl); |
e1636f82 RG |
3425 | /* setting state to indeterminate since validation is disabled for local auth zone, |
3426 | and Insecure would be misleading. */ | |
3427 | state = Indeterminate; | |
9fc36e90 | 3428 | d_wasOutOfBand = doOOBResolve(qname, qtype, lwr.d_records, depth, lwr.d_rcode); |
4957a608 BH |
3429 | lwr.d_tcbit=false; |
3430 | lwr.d_aabit=true; | |
6dfff36f RG |
3431 | |
3432 | /* we have received an answer, are we done ? */ | |
51b6b728 | 3433 | bool done = processAnswer(depth, lwr, qname, qtype, auth, false, ednsmask, sendRDQuery, nameservers, ret, luaconfsLocal->dfe, &gotNewServers, &rcode, state); |
6dfff36f RG |
3434 | if (done) { |
3435 | return rcode; | |
3436 | } | |
3437 | if (gotNewServers) { | |
116d1288 OM |
3438 | if (stopAtDelegation && *stopAtDelegation == Stop) { |
3439 | *stopAtDelegation = Stopped; | |
3440 | return rcode; | |
3441 | } | |
6dfff36f RG |
3442 | break; |
3443 | } | |
5605c067 BH |
3444 | } |
3445 | else { | |
6dfff36f | 3446 | /* if tns is empty, retrieveAddressesForNS() knows we have hardcoded servers (i.e. "forwards") */ |
b4c8789a | 3447 | remoteIPs = retrieveAddressesForNS(prefix, qname, tns, depth, beenthere, rnameservers, nameservers, sendRDQuery, pierceDontQuery, flawedNSSet, cacheOnly); |
4957a608 BH |
3448 | |
3449 | if(remoteIPs.empty()) { | |
feccaf7f | 3450 | LOG(prefix<<qname<<": Failed to get IP for NS "<<tns->first<<", trying next if available"<<endl); |
4957a608 BH |
3451 | flawedNSSet=true; |
3452 | continue; | |
3453 | } | |
3454 | else { | |
b8470add | 3455 | bool hitPolicy{false}; |
feccaf7f | 3456 | LOG(prefix<<qname<<": Resolved '"<<auth<<"' NS "<<tns->first<<" to: "); |
26ca3513 RG |
3457 | for(remoteIP = remoteIPs.cbegin(); remoteIP != remoteIPs.cend(); ++remoteIP) { |
3458 | if(remoteIP != remoteIPs.cbegin()) { | |
77499b05 BH |
3459 | LOG(", "); |
3460 | } | |
3461 | LOG(remoteIP->toString()); | |
69cbdef9 | 3462 | if(nameserverIPBlockedByRPZ(luaconfsLocal->dfe, *remoteIP)) { |
26ca3513 | 3463 | hitPolicy = true; |
b8470add | 3464 | } |
4957a608 | 3465 | } |
77499b05 | 3466 | LOG(endl); |
b8470add PL |
3467 | if (hitPolicy) //implies d_wantsRPZ |
3468 | return -2; | |
4957a608 BH |
3469 | } |
3470 | ||
26ca3513 | 3471 | for(remoteIP = remoteIPs.cbegin(); remoteIP != remoteIPs.cend(); ++remoteIP) { |
2189085d | 3472 | LOG(prefix<<qname<<": Trying IP "<< remoteIP->toStringWithPort() <<", asking '"<<qname<<"|"<<qtype.getName()<<"'"<<endl); |
6dfff36f | 3473 | |
26ca3513 | 3474 | if (throttledOrBlocked(prefix, *remoteIP, qname, qtype, pierceDontQuery)) { |
4957a608 BH |
3475 | continue; |
3476 | } | |
9de3e034 | 3477 | |
6dfff36f RG |
3478 | bool truncated = false; |
3479 | bool gotAnswer = doResolveAtThisIP(prefix, qname, qtype, lwr, ednsmask, auth, sendRDQuery, | |
feccaf7f | 3480 | tns->first, *remoteIP, false, &truncated); |
6dfff36f RG |
3481 | if (gotAnswer && truncated ) { |
3482 | /* retry, over TCP this time */ | |
3483 | gotAnswer = doResolveAtThisIP(prefix, qname, qtype, lwr, ednsmask, auth, sendRDQuery, | |
feccaf7f | 3484 | tns->first, *remoteIP, true, &truncated); |
6dfff36f | 3485 | } |
710af846 | 3486 | |
6dfff36f RG |
3487 | if (!gotAnswer) { |
3488 | continue; | |
3489 | } | |
352b4183 | 3490 | |
feccaf7f | 3491 | LOG(prefix<<qname<<": Got "<<(unsigned int)lwr.d_records.size()<<" answers from "<<tns->first<<" ("<< remoteIP->toString() <<"), rcode="<<lwr.d_rcode<<" ("<<RCode::to_s(lwr.d_rcode)<<"), aa="<<lwr.d_aabit<<", in "<<lwr.d_usec/1000<<"ms"<<endl); |
92011b8f | 3492 | |
6dfff36f RG |
3493 | /* // for you IPv6 fanatics :-) |
3494 | if(remoteIP->sin4.sin_family==AF_INET6) | |
3495 | lwr.d_usec/=3; | |
3496 | */ | |
3497 | // cout<<"msec: "<<lwr.d_usec/1000.0<<", "<<g_avgLatency/1000.0<<'\n'; | |
710af846 | 3498 | |
feccaf7f | 3499 | t_sstorage.nsSpeeds[tns->first.empty()? DNSName(remoteIP->toStringWithPort()) : tns->first].submit(*remoteIP, lwr.d_usec, &d_now); |
628e2c7b | 3500 | |
6dfff36f | 3501 | /* we have received an answer, are we done ? */ |
51b6b728 | 3502 | bool done = processAnswer(depth, lwr, qname, qtype, auth, wasForwarded, ednsmask, sendRDQuery, nameservers, ret, luaconfsLocal->dfe, &gotNewServers, &rcode, state); |
6dfff36f RG |
3503 | if (done) { |
3504 | return rcode; | |
4957a608 | 3505 | } |
6dfff36f | 3506 | if (gotNewServers) { |
116d1288 OM |
3507 | if (stopAtDelegation && *stopAtDelegation == Stop) { |
3508 | *stopAtDelegation = Stopped; | |
3509 | return rcode; | |
3510 | } | |
6dfff36f | 3511 | break; |
4957a608 | 3512 | } |
6dfff36f RG |
3513 | /* was lame */ |
3514 | t_sstorage.throttle.throttle(d_now.tv_sec, boost::make_tuple(*remoteIP, qname, qtype.getCode()), 60, 100); | |
4957a608 | 3515 | } |
aadceba8 | 3516 | |
6dfff36f RG |
3517 | if (gotNewServers) { |
3518 | break; | |
4957a608 | 3519 | } |
620db2c8 | 3520 | |
6dfff36f RG |
3521 | if(remoteIP == remoteIPs.cend()) // we tried all IP addresses, none worked |
3522 | continue; | |
620db2c8 | 3523 | |
86c152f2 BH |
3524 | } |
3525 | } | |
86c152f2 | 3526 | } |
ac539791 | 3527 | return -1; |
86c152f2 BH |
3528 | } |
3529 | ||
2fe3354d | 3530 | void SyncRes::setQuerySource(const ComboAddress& requestor, boost::optional<const EDNSSubnetOpts&> incomingECS) |
8a3a3822 | 3531 | { |
2fe3354d CH |
3532 | d_requestor = requestor; |
3533 | ||
3534 | if (incomingECS && incomingECS->source.getBits() > 0) { | |
3535 | d_cacheRemote = incomingECS->source.getMaskedNetwork(); | |
3536 | uint8_t bits = std::min(incomingECS->source.getBits(), (incomingECS->source.isIpv4() ? s_ecsipv4limit : s_ecsipv6limit)); | |
3537 | ComboAddress trunc = incomingECS->source.getNetwork(); | |
3538 | trunc.truncate(bits); | |
3539 | d_outgoingECSNetwork = boost::optional<Netmask>(Netmask(trunc, bits)); | |
3540 | } else { | |
3541 | d_cacheRemote = d_requestor; | |
3542 | if(!incomingECS && s_ednslocalsubnets.match(d_requestor)) { | |
3543 | ComboAddress trunc = d_requestor; | |
3544 | uint8_t bits = d_requestor.isIPv4() ? 32 : 128; | |
3545 | bits = std::min(bits, (trunc.isIPv4() ? s_ecsipv4limit : s_ecsipv6limit)); | |
3546 | trunc.truncate(bits); | |
3547 | d_outgoingECSNetwork = boost::optional<Netmask>(Netmask(trunc, bits)); | |
3548 | } else if (s_ecsScopeZero.source.getBits() > 0) { | |
8a3a3822 RG |
3549 | /* RFC7871 says we MUST NOT send any ECS if the source scope is 0. |
3550 | But using an empty ECS in that case would mean inserting | |
3551 | a non ECS-specific entry into the cache, preventing any further | |
3552 | ECS-specific query to be sent. | |
3553 | So instead we use the trick described in section 7.1.2: | |
3554 | "The subsequent Recursive Resolver query to the Authoritative Nameserver | |
3555 | will then either not include an ECS option or MAY optionally include | |
3556 | its own address information, which is what the Authoritative | |
3557 | Nameserver will almost certainly use to generate any Tailored | |
3558 | Response in lieu of an option. This allows the answer to be handled | |
3559 | by the same caching mechanism as other queries, with an explicit | |
3560 | indicator of the applicable scope. Subsequent Stub Resolver queries | |
3561 | for /0 can then be answered from this cached response. | |
3562 | */ | |
2fe3354d CH |
3563 | d_outgoingECSNetwork = boost::optional<Netmask>(s_ecsScopeZero.source.getMaskedNetwork()); |
3564 | d_cacheRemote = s_ecsScopeZero.source.getNetwork(); | |
3565 | } else { | |
3566 | // ECS disabled because no scope-zero address could be derived. | |
3567 | d_outgoingECSNetwork = boost::none; | |
8a3a3822 RG |
3568 | } |
3569 | } | |
8a3a3822 RG |
3570 | } |
3571 | ||
2fe3354d | 3572 | boost::optional<Netmask> SyncRes::getEDNSSubnetMask(const DNSName& dn, const ComboAddress& rem) |
e9f9b8ec | 3573 | { |
2fe3354d CH |
3574 | if(d_outgoingECSNetwork && (s_ednsdomains.check(dn) || s_ednsremotesubnets.match(rem))) { |
3575 | return d_outgoingECSNetwork; | |
e9f9b8ec | 3576 | } |
2fe3354d | 3577 | return boost::none; |
e9f9b8ec | 3578 | } |
bd53ea9d | 3579 | |
9065eb05 RG |
3580 | void SyncRes::parseEDNSSubnetWhitelist(const std::string& wlist) |
3581 | { | |
3582 | vector<string> parts; | |
3583 | stringtok(parts, wlist, ",; "); | |
3584 | for(const auto& a : parts) { | |
3585 | try { | |
2fe3354d | 3586 | s_ednsremotesubnets.addMask(Netmask(a)); |
9065eb05 RG |
3587 | } |
3588 | catch(...) { | |
3589 | s_ednsdomains.add(DNSName(a)); | |
3590 | } | |
3591 | } | |
3592 | } | |
3593 | ||
2fe3354d CH |
3594 | void SyncRes::parseEDNSSubnetAddFor(const std::string& subnetlist) |
3595 | { | |
3596 | vector<string> parts; | |
3597 | stringtok(parts, subnetlist, ",; "); | |
3598 | for(const auto& a : parts) { | |
3599 | s_ednslocalsubnets.addMask(a); | |
3600 | } | |
3601 | } | |
3602 | ||
8ce79a22 | 3603 | // used by PowerDNSLua - note that this neglects to add the packet count & statistics back to pdns_ercursor.cc |
a3e7b735 | 3604 | int directResolve(const DNSName& qname, const QType& qtype, int qclass, vector<DNSRecord>& ret) |
bd53ea9d PD |
3605 | { |
3606 | struct timeval now; | |
3607 | gettimeofday(&now, 0); | |
710af846 | 3608 | |
bd53ea9d | 3609 | SyncRes sr(now); |
13658071 RB |
3610 | int res = -1; |
3611 | try { | |
3612 | res = sr.beginResolve(qname, QType(qtype), qclass, ret); | |
3613 | } | |
3614 | catch(const PDNSException& e) { | |
3615 | g_log<<Logger::Error<<"Failed to resolve "<<qname.toLogString()<<", got pdns exception: "<<e.reason<<endl; | |
3616 | ret.clear(); | |
3617 | } | |
3618 | catch(const ImmediateServFailException& e) { | |
3619 | g_log<<Logger::Error<<"Failed to resolve "<<qname.toLogString()<<", got ImmediateServFailException: "<<e.reason<<endl; | |
3620 | ret.clear(); | |
3621 | } | |
3622 | catch(const std::exception& e) { | |
3623 | g_log<<Logger::Error<<"Failed to resolve "<<qname.toLogString()<<", got STL error: "<<e.what()<<endl; | |
3624 | ret.clear(); | |
3625 | } | |
3626 | catch(...) { | |
3627 | g_log<<Logger::Error<<"Failed to resolve "<<qname.toLogString()<<", got an exception"<<endl; | |
3628 | ret.clear(); | |
3629 | } | |
e325f20c | 3630 | |
bd53ea9d PD |
3631 | return res; |
3632 | } | |
30ee601a | 3633 | |
30ee601a RG |
3634 | int SyncRes::getRootNS(struct timeval now, asyncresolve_t asyncCallback) { |
3635 | SyncRes sr(now); | |
3636 | sr.setDoEDNS0(true); | |
0b29b9c5 | 3637 | sr.setUpdatingRootNS(); |
30ee601a | 3638 | sr.setDoDNSSEC(g_dnssecmode != DNSSECMode::Off); |
0c43f455 | 3639 | sr.setDNSSECValidationRequested(g_dnssecmode != DNSSECMode::Off && g_dnssecmode != DNSSECMode::ProcessNoValidate); |
30ee601a RG |
3640 | sr.setAsyncCallback(asyncCallback); |
3641 | ||
3642 | vector<DNSRecord> ret; | |
3643 | int res=-1; | |
3644 | try { | |
3645 | res=sr.beginResolve(g_rootdnsname, QType(QType::NS), 1, ret); | |
3646 | if (g_dnssecmode != DNSSECMode::Off && g_dnssecmode != DNSSECMode::ProcessNoValidate) { | |
4d2be65d | 3647 | auto state = sr.getValidationState(); |
30ee601a RG |
3648 | if (state == Bogus) |
3649 | throw PDNSException("Got Bogus validation result for .|NS"); | |
3650 | } | |
3651 | return res; | |
3652 | } | |
c78ceb39 | 3653 | catch(const PDNSException& e) { |
e6a9dde5 | 3654 | g_log<<Logger::Error<<"Failed to update . records, got an exception: "<<e.reason<<endl; |
30ee601a | 3655 | } |
c78ceb39 | 3656 | catch(const ImmediateServFailException& e) { |
e6a9dde5 | 3657 | g_log<<Logger::Error<<"Failed to update . records, got an exception: "<<e.reason<<endl; |
c78ceb39 RG |
3658 | } |
3659 | catch(const std::exception& e) { | |
e6a9dde5 | 3660 | g_log<<Logger::Error<<"Failed to update . records, got an exception: "<<e.what()<<endl; |
30ee601a | 3661 | } |
c78ceb39 | 3662 | catch(...) { |
e6a9dde5 | 3663 | g_log<<Logger::Error<<"Failed to update . records, got an exception"<<endl; |
30ee601a | 3664 | } |
c78ceb39 | 3665 | |
30ee601a | 3666 | if(!res) { |
e6a9dde5 | 3667 | g_log<<Logger::Notice<<"Refreshed . records"<<endl; |
30ee601a RG |
3668 | } |
3669 | else | |
e6a9dde5 | 3670 | g_log<<Logger::Error<<"Failed to update . records, RCODE="<<res<<endl; |
c78ceb39 | 3671 | |
30ee601a RG |
3672 | return res; |
3673 | } |