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12c86877 BH |
1 | /* |
2 | PowerDNS Versatile Database Driven Nameserver | |
2e7834cb | 3 | Copyright (C) 2002-2012 PowerDNS.COM BV |
12c86877 BH |
4 | |
5 | This program is free software; you can redistribute it and/or modify | |
22dc646a BH |
6 | it under the terms of the GNU General Public License version 2 |
7 | as published by the Free Software Foundation | |
f782fe38 MH |
8 | |
9 | Additionally, the license of this program contains a special | |
10 | exception which allows to distribute the program in binary form when | |
11 | it is linked against OpenSSL. | |
12 | ||
12c86877 BH |
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 | |
06bd9ccf | 20 | Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
12c86877 | 21 | */ |
870a0fe4 AT |
22 | #ifdef HAVE_CONFIG_H |
23 | #include "config.h" | |
24 | #endif | |
b6f3b03a | 25 | #include <boost/algorithm/string.hpp> |
097b1e68 | 26 | #include <boost/scoped_array.hpp> |
bf269e28 | 27 | #include "auth-packetcache.hh" |
1258abe0 | 28 | #include "utility.hh" |
519f5484 | 29 | #include "threadname.hh" |
add640c0 | 30 | #include "dnssecinfra.hh" |
4c1474f3 | 31 | #include "dnsseckeeper.hh" |
12c86877 | 32 | #include <cstdio> |
4888e4b2 | 33 | #include "base32.hh" |
12c86877 BH |
34 | #include <cstring> |
35 | #include <cstdlib> | |
36 | #include <sys/types.h> | |
940d7811 | 37 | #include <netinet/tcp.h> |
12c86877 BH |
38 | #include <iostream> |
39 | #include <string> | |
40 | #include "tcpreceiver.hh" | |
67d74e49 | 41 | #include "sstuff.hh" |
fa8fd4d2 | 42 | |
dc6aa7f5 AV |
43 | #include <cerrno> |
44 | #include <csignal> | |
78bcb858 | 45 | #include "base64.hh" |
12c86877 BH |
46 | #include "ueberbackend.hh" |
47 | #include "dnspacket.hh" | |
48 | #include "nameserver.hh" | |
49 | #include "distributor.hh" | |
50 | #include "lock.hh" | |
51 | #include "logger.hh" | |
52 | #include "arguments.hh" | |
379ab445 | 53 | |
8cb70f23 | 54 | #include "auth-main.hh" |
12c86877 BH |
55 | #include "packethandler.hh" |
56 | #include "statbag.hh" | |
12c86877 | 57 | #include "communicator.hh" |
61b26744 | 58 | #include "namespaces.hh" |
8e9b7d99 | 59 | #include "signingpipe.hh" |
273d88b2 | 60 | #include "stubresolver.hh" |
4172a5b2 PD |
61 | #include "proxy-protocol.hh" |
62 | #include "noinitvector.hh" | |
f13cde2a | 63 | #include "gss_context.hh" |
1f07a63f | 64 | #include "pdnsexception.hh" |
bf269e28 | 65 | extern AuthPacketCache PC; |
12c86877 BH |
66 | extern StatBag S; |
67 | ||
68 | /** | |
69 | \file tcpreceiver.cc | |
70 | \brief This file implements the tcpreceiver that receives and answers questions over TCP/IP | |
71 | */ | |
72 | ||
c2826d2e | 73 | std::unique_ptr<Semaphore> TCPNameserver::d_connectionroom_sem{nullptr}; |
24fb5774 | 74 | LockGuarded<std::unique_ptr<PacketHandler>> TCPNameserver::s_P{nullptr}; |
d322f931 | 75 | unsigned int TCPNameserver::d_maxTCPConnections = 0; |
9f1d5826 | 76 | NetmaskGroup TCPNameserver::d_ng; |
cb0af1a1 RG |
77 | size_t TCPNameserver::d_maxTransactionsPerConn; |
78 | size_t TCPNameserver::d_maxConnectionsPerClient; | |
79 | unsigned int TCPNameserver::d_idleTimeout; | |
80 | unsigned int TCPNameserver::d_maxConnectionDuration; | |
24fb5774 | 81 | LockGuarded<std::map<ComboAddress,size_t,ComboAddress::addressOnlyLessThan>> TCPNameserver::s_clientsCount; |
12c86877 | 82 | |
12c86877 BH |
83 | void TCPNameserver::go() |
84 | { | |
e6a9dde5 | 85 | g_log<<Logger::Error<<"Creating backend connection for TCP"<<endl; |
24fb5774 | 86 | s_P.lock()->reset(); |
12c86877 | 87 | try { |
24fb5774 | 88 | *(s_P.lock()) = make_unique<PacketHandler>(); |
12c86877 | 89 | } |
3f81d239 | 90 | catch(PDNSException &ae) { |
e6a9dde5 | 91 | g_log<<Logger::Error<<"TCP server is unable to launch backends - will try again when questions come in: "<<ae.reason<<endl; |
12c86877 | 92 | } |
12c86877 | 93 | |
969e4459 | 94 | std::thread th([this](){thread();}); |
0ddde5fb | 95 | th.detach(); |
12c86877 BH |
96 | } |
97 | ||
3f81d239 | 98 | // throws PDNSException if things didn't go according to plan, returns 0 if really 0 bytes were read |
cb0af1a1 | 99 | static int readnWithTimeout(int fd, void* buffer, unsigned int n, unsigned int idleTimeout, bool throwOnEOF=true, unsigned int totalTimeout=0) |
12c86877 | 100 | { |
6a3e5d1a BH |
101 | unsigned int bytes=n; |
102 | char *ptr = (char*)buffer; | |
103 | int ret; | |
cb0af1a1 RG |
104 | time_t start = 0; |
105 | unsigned int remainingTotal = totalTimeout; | |
106 | if (totalTimeout) { | |
4646277d | 107 | start = time(nullptr); |
cb0af1a1 | 108 | } |
6a3e5d1a BH |
109 | while(bytes) { |
110 | ret=read(fd, ptr, bytes); | |
111 | if(ret < 0) { | |
112 | if(errno==EAGAIN) { | |
cb0af1a1 | 113 | ret=waitForData(fd, (totalTimeout == 0 || idleTimeout <= remainingTotal) ? idleTimeout : remainingTotal); |
4957a608 BH |
114 | if(ret < 0) |
115 | throw NetworkError("Waiting for data read"); | |
116 | if(!ret) | |
117 | throw NetworkError("Timeout reading data"); | |
118 | continue; | |
6a3e5d1a BH |
119 | } |
120 | else | |
4957a608 | 121 | throw NetworkError("Reading data: "+stringerror()); |
6a3e5d1a BH |
122 | } |
123 | if(!ret) { | |
124 | if(!throwOnEOF && n == bytes) | |
4957a608 | 125 | return 0; |
6a3e5d1a | 126 | else |
4957a608 | 127 | throw NetworkError("Did not fulfill read from TCP due to EOF"); |
6a3e5d1a | 128 | } |
1e05b07c | 129 | |
6a3e5d1a BH |
130 | ptr += ret; |
131 | bytes -= ret; | |
cb0af1a1 | 132 | if (totalTimeout) { |
4646277d | 133 | time_t now = time(nullptr); |
600c8a65 | 134 | const auto elapsed = now - start; |
62a34cfd | 135 | if (elapsed >= static_cast<decltype(elapsed)>(remainingTotal)) { |
cb0af1a1 RG |
136 | throw NetworkError("Timeout while reading data"); |
137 | } | |
138 | start = now; | |
62a34cfd RG |
139 | if (elapsed > 0) { |
140 | remainingTotal -= elapsed; | |
141 | } | |
cb0af1a1 | 142 | } |
6a3e5d1a BH |
143 | } |
144 | return n; | |
145 | } | |
12c86877 | 146 | |
6a3e5d1a | 147 | // ditto |
cb0af1a1 | 148 | static void writenWithTimeout(int fd, const void *buffer, unsigned int n, unsigned int idleTimeout) |
6a3e5d1a BH |
149 | { |
150 | unsigned int bytes=n; | |
151 | const char *ptr = (char*)buffer; | |
152 | int ret; | |
153 | while(bytes) { | |
154 | ret=write(fd, ptr, bytes); | |
155 | if(ret < 0) { | |
156 | if(errno==EAGAIN) { | |
cb0af1a1 | 157 | ret=waitForRWData(fd, false, idleTimeout, 0); |
4957a608 BH |
158 | if(ret < 0) |
159 | throw NetworkError("Waiting for data write"); | |
160 | if(!ret) | |
161 | throw NetworkError("Timeout writing data"); | |
162 | continue; | |
6a3e5d1a BH |
163 | } |
164 | else | |
4957a608 | 165 | throw NetworkError("Writing data: "+stringerror()); |
6a3e5d1a | 166 | } |
12c86877 | 167 | if(!ret) { |
67d74e49 | 168 | throw NetworkError("Did not fulfill TCP write due to EOF"); |
12c86877 | 169 | } |
1e05b07c | 170 | |
6a3e5d1a BH |
171 | ptr += ret; |
172 | bytes -= ret; | |
12c86877 | 173 | } |
12c86877 BH |
174 | } |
175 | ||
02b4b703 | 176 | void TCPNameserver::sendPacket(std::unique_ptr<DNSPacket>& p, int outsock, bool last) |
6a3e5d1a | 177 | { |
1f07a63f PD |
178 | uint16_t len=htons(p->getString(true).length()); |
179 | ||
180 | // this also calls p->getString; call it after our explicit call so throwsOnTruncation=true is honoured | |
02b4b703 | 181 | g_rs.submitResponse(*p, false, last); |
9951e2d0 | 182 | |
fbaa5e09 BH |
183 | string buffer((const char*)&len, 2); |
184 | buffer.append(p->getString()); | |
cb0af1a1 | 185 | writenWithTimeout(outsock, buffer.c_str(), buffer.length(), d_idleTimeout); |
6a3e5d1a BH |
186 | } |
187 | ||
188 | ||
cb0af1a1 | 189 | void TCPNameserver::getQuestion(int fd, char *mesg, int pktlen, const ComboAddress &remote, unsigned int totalTime) |
6a3e5d1a BH |
190 | try |
191 | { | |
cb0af1a1 | 192 | readnWithTimeout(fd, mesg, pktlen, d_idleTimeout, true, totalTime); |
6a3e5d1a | 193 | } |
67d74e49 BH |
194 | catch(NetworkError& ae) { |
195 | throw NetworkError("Error reading DNS data from TCP client "+remote.toString()+": "+ae.what()); | |
12c86877 BH |
196 | } |
197 | ||
cb0af1a1 RG |
198 | static bool maxConnectionDurationReached(unsigned int maxConnectionDuration, time_t start, unsigned int& remainingTime) |
199 | { | |
200 | if (maxConnectionDuration) { | |
4646277d | 201 | time_t elapsed = time(nullptr) - start; |
62a34cfd | 202 | if (elapsed >= maxConnectionDuration) { |
cb0af1a1 RG |
203 | return true; |
204 | } | |
62a34cfd | 205 | if (elapsed > 0) { |
cdf0fe6e | 206 | remainingTime = static_cast<unsigned int>(maxConnectionDuration - elapsed); |
62a34cfd | 207 | } |
cb0af1a1 RG |
208 | } |
209 | return false; | |
210 | } | |
211 | ||
212 | void TCPNameserver::decrementClientCount(const ComboAddress& remote) | |
213 | { | |
214 | if (d_maxConnectionsPerClient) { | |
24fb5774 RG |
215 | auto count = s_clientsCount.lock(); |
216 | auto it = count->find(remote); | |
217 | if (it == count->end()) { | |
218 | // this is worrying, but nothing we can do at this point | |
219 | return; | |
220 | } | |
221 | --it->second; | |
222 | if (it->second == 0) { | |
223 | count->erase(it); | |
cb0af1a1 RG |
224 | } |
225 | } | |
226 | } | |
227 | ||
0ddde5fb | 228 | void TCPNameserver::doConnection(int fd) |
12c86877 | 229 | { |
519f5484 | 230 | setThreadName("pdns/tcpConnect"); |
c2826d2e | 231 | std::unique_ptr<DNSPacket> packet; |
208abc4c | 232 | ComboAddress remote, accountremote; |
4f5e7925 | 233 | socklen_t remotelen=sizeof(remote); |
cb0af1a1 RG |
234 | size_t transactions = 0; |
235 | time_t start = 0; | |
236 | if (d_maxConnectionDuration) { | |
4646277d | 237 | start = time(nullptr); |
cb0af1a1 | 238 | } |
4f5e7925 | 239 | |
4f5e7925 | 240 | if(getpeername(fd, (struct sockaddr *)&remote, &remotelen) < 0) { |
e6a9dde5 | 241 | g_log<<Logger::Warning<<"Received question from socket which had no remote address, dropping ("<<stringerror()<<")"<<endl; |
4f5e7925 | 242 | d_connectionroom_sem->post(); |
a7b68ae7 RG |
243 | try { |
244 | closesocket(fd); | |
245 | } | |
246 | catch(const PDNSException& e) { | |
e6a9dde5 | 247 | g_log<<Logger::Error<<"Error closing TCP socket: "<<e.reason<<endl; |
a7b68ae7 | 248 | } |
0ddde5fb | 249 | return; |
4f5e7925 | 250 | } |
251 | ||
3897b9e1 | 252 | setNonBlocking(fd); |
12c86877 | 253 | try { |
c2b4ccc0 | 254 | int mesgsize=65535; |
dc593046 | 255 | boost::scoped_array<char> mesg(new char[mesgsize]); |
4172a5b2 PD |
256 | std::optional<ComboAddress> inner_remote; |
257 | bool inner_tcp = false; | |
258 | ||
e6a9dde5 | 259 | DLOG(g_log<<"TCP Connection accepted on fd "<<fd<<endl); |
21a303f3 | 260 | bool logDNSQueries= ::arg().mustDo("log-dns-queries"); |
4172a5b2 PD |
261 | if (g_proxyProtocolACL.match(remote)) { |
262 | unsigned int remainingTime = 0; | |
263 | PacketBuffer proxyData; | |
264 | proxyData.reserve(g_proxyProtocolMaximumSize); | |
265 | ssize_t used; | |
266 | ||
267 | // this for-loop ends by throwing, or by having gathered a complete proxy header | |
268 | for (;;) { | |
269 | used = isProxyHeaderComplete(proxyData); | |
270 | if (used < 0) { | |
271 | ssize_t origsize = proxyData.size(); | |
272 | proxyData.resize(origsize + -used); | |
273 | if (maxConnectionDurationReached(d_maxConnectionDuration, start, remainingTime)) { | |
274 | throw NetworkError("Error reading PROXYv2 header from TCP client "+remote.toString()+": maximum TCP connection duration exceeded"); | |
275 | } | |
276 | ||
277 | try { | |
278 | readnWithTimeout(fd, &proxyData[origsize], -used, d_idleTimeout, true, remainingTime); | |
279 | } | |
280 | catch(NetworkError& ae) { | |
281 | throw NetworkError("Error reading PROXYv2 header from TCP client "+remote.toString()+": "+ae.what()); | |
282 | } | |
283 | } | |
284 | else if (used == 0) { | |
285 | throw NetworkError("Error reading PROXYv2 header from TCP client "+remote.toString()+": PROXYv2 header was invalid"); | |
286 | } | |
287 | else if (static_cast<size_t>(used) > g_proxyProtocolMaximumSize) { | |
288 | throw NetworkError("Error reading PROXYv2 header from TCP client "+remote.toString()+": PROXYv2 header too big"); | |
289 | } | |
290 | else { // used > 0 && used <= g_proxyProtocolMaximumSize | |
291 | break; | |
292 | } | |
293 | } | |
294 | ComboAddress psource, pdestination; | |
295 | bool proxyProto, tcp; | |
296 | std::vector<ProxyProtocolValue> ppvalues; | |
297 | ||
298 | used = parseProxyHeader(proxyData, proxyProto, psource, pdestination, tcp, ppvalues); | |
299 | if (used <= 0) { | |
300 | throw NetworkError("Error reading PROXYv2 header from TCP client "+remote.toString()+": PROXYv2 header was invalid"); | |
301 | } | |
302 | if (static_cast<size_t>(used) > g_proxyProtocolMaximumSize) { | |
303 | throw NetworkError("Error reading PROXYv2 header from TCP client "+remote.toString()+": PROXYv2 header was oversized"); | |
304 | } | |
305 | inner_remote = psource; | |
306 | inner_tcp = tcp; | |
208abc4c KM |
307 | accountremote = psource; |
308 | } | |
309 | else { | |
310 | accountremote = remote; | |
4172a5b2 PD |
311 | } |
312 | ||
12c86877 | 313 | for(;;) { |
cb0af1a1 RG |
314 | unsigned int remainingTime = 0; |
315 | transactions++; | |
316 | if (d_maxTransactionsPerConn && transactions > d_maxTransactionsPerConn) { | |
e6a9dde5 | 317 | g_log << Logger::Notice<<"TCP Remote "<< remote <<" exceeded the number of transactions per connection, dropping."; |
cb0af1a1 RG |
318 | break; |
319 | } | |
320 | if (maxConnectionDurationReached(d_maxConnectionDuration, start, remainingTime)) { | |
e6a9dde5 | 321 | g_log << Logger::Notice<<"TCP Remote "<< remote <<" exceeded the maximum TCP connection duration, dropping."; |
cb0af1a1 RG |
322 | break; |
323 | } | |
6a3e5d1a BH |
324 | |
325 | uint16_t pktlen; | |
cb0af1a1 | 326 | if(!readnWithTimeout(fd, &pktlen, 2, d_idleTimeout, false, remainingTime)) |
4957a608 | 327 | break; |
6a3e5d1a | 328 | else |
4957a608 | 329 | pktlen=ntohs(pktlen); |
12c86877 | 330 | |
366e1e5e AT |
331 | // this check will always be false *if* no one touches |
332 | // the mesg array. pktlen can be maximum of 65535 as | |
1e05b07c FM |
333 | // it is 2 byte unsigned variable. In getQuestion, we |
334 | // write to 0 up to pktlen-1 so 65535 is just right. | |
366e1e5e AT |
335 | |
336 | // do not remove this check as it will catch if someone | |
1e05b07c | 337 | // decreases the mesg buffer size for some reason. |
c2b4ccc0 | 338 | if(pktlen > mesgsize) { |
e6a9dde5 | 339 | g_log<<Logger::Warning<<"Received an overly large question from "<<remote.toString()<<", dropping"<<endl; |
4957a608 | 340 | break; |
12c86877 | 341 | } |
1e05b07c | 342 | |
cb0af1a1 | 343 | if (maxConnectionDurationReached(d_maxConnectionDuration, start, remainingTime)) { |
e6a9dde5 | 344 | g_log << Logger::Notice<<"TCP Remote "<< remote <<" exceeded the maximum TCP connection duration, dropping."; |
cb0af1a1 RG |
345 | break; |
346 | } | |
347 | ||
348 | getQuestion(fd, mesg.get(), pktlen, remote, remainingTime); | |
208abc4c KM |
349 | S.inc("tcp-queries"); |
350 | if (accountremote.sin4.sin_family == AF_INET6) | |
5fd567ec | 351 | S.inc("tcp6-queries"); |
352 | else | |
353 | S.inc("tcp4-queries"); | |
3e579e91 | 354 | |
c2826d2e | 355 | packet=make_unique<DNSPacket>(true); |
809fe23f | 356 | packet->setRemote(&remote); |
e9dd48f9 | 357 | packet->d_tcp=true; |
4172a5b2 PD |
358 | if (inner_remote) { |
359 | packet->d_inner_remote = inner_remote; | |
360 | packet->d_tcp = inner_tcp; | |
361 | } | |
ff76e8b4 | 362 | packet->setSocket(fd); |
c2b4ccc0 | 363 | if(packet->parse(mesg.get(), pktlen)<0) |
4957a608 | 364 | break; |
78f1d7b5 PL |
365 | |
366 | if (packet->hasEDNSCookie()) | |
367 | S.inc("tcp-cookie-queries"); | |
368 | ||
6e59a580 | 369 | if(packet->qtype.getCode()==QType::AXFR) { |
02b4b703 | 370 | doAXFR(packet->qdomain, packet, fd); |
6e59a580 KM |
371 | continue; |
372 | } | |
373 | ||
374 | if(packet->qtype.getCode()==QType::IXFR) { | |
02b4b703 | 375 | doIXFR(packet, fd); |
4957a608 | 376 | continue; |
12c86877 BH |
377 | } |
378 | ||
1e05b07c | 379 | std::unique_ptr<DNSPacket> reply; |
c2826d2e | 380 | auto cached = make_unique<DNSPacket>(false); |
fe498ace | 381 | if(logDNSQueries) { |
4172a5b2 | 382 | g_log << Logger::Notice<<"TCP Remote "<< packet->getRemoteString() <<" wants '" << packet->qdomain<<"|"<<packet->qtype.toString() << |
1b16851b | 383 | "', do = " <<packet->d_dnssecOk <<", bufsize = "<< packet->getMaxReplyLen(); |
fe498ace | 384 | } |
bb5903e2 | 385 | |
9a037bfa | 386 | if(PC.enabled()) { |
c2826d2e | 387 | if(packet->couldBeCached() && PC.get(*packet, *cached)) { // short circuit - does the PacketCache recognize this question? |
9a037bfa | 388 | if(logDNSQueries) |
1b16851b | 389 | g_log<<": packetcache HIT"<<endl; |
9a037bfa | 390 | cached->setRemote(&packet->d_remote); |
208abc4c | 391 | cached->d_inner_remote = packet->d_inner_remote; |
9a037bfa KM |
392 | cached->d.id=packet->d.id; |
393 | cached->d.rd=packet->d.rd; // copy in recursion desired bit | |
394 | cached->commitD(); // commit d to the packet inlined | |
395 | ||
396 | sendPacket(cached, fd); // presigned, don't do it again | |
397 | continue; | |
398 | } | |
21a303f3 | 399 | if(logDNSQueries) |
1b16851b | 400 | g_log<<": packetcache MISS"<<endl; |
bbe4b041 OM |
401 | } else { |
402 | if (logDNSQueries) { | |
1b16851b | 403 | g_log<<endl; |
bbe4b041 | 404 | } |
12c86877 | 405 | } |
12c86877 | 406 | { |
24fb5774 RG |
407 | auto packetHandler = s_P.lock(); |
408 | if (!*packetHandler) { | |
994cae6b | 409 | g_log<<Logger::Warning<<"TCP server is without backend connections, launching"<<endl; |
24fb5774 | 410 | *packetHandler = make_unique<PacketHandler>(); |
4957a608 | 411 | } |
4957a608 | 412 | |
24fb5774 | 413 | reply = (*packetHandler)->doQuestion(*packet); // we really need to ask the backend :-) |
12c86877 BH |
414 | } |
415 | ||
12c86877 | 416 | if(!reply) // unable to write an answer? |
4957a608 | 417 | break; |
b552d7b1 | 418 | |
ff76e8b4 | 419 | sendPacket(reply, fd); |
15e39ee4 | 420 | #ifdef ENABLE_GSS_TSIG |
c113acc3 OM |
421 | if (g_doGssTSIG) { |
422 | packet->cleanupGSS(reply->d.rcode); | |
423 | } | |
15e39ee4 | 424 | #endif |
12c86877 | 425 | } |
12c86877 | 426 | } |
3f81d239 | 427 | catch(PDNSException &ae) { |
24fb5774 | 428 | s_P.lock()->reset(); // on next call, backend will be recycled |
a274da88 | 429 | g_log << Logger::Error << "TCP Connection Thread for client " << remote << " failed, cycling backend: " << ae.reason << endl; |
ef1d2f44 | 430 | } |
0afa9049 | 431 | catch(NetworkError &e) { |
a274da88 | 432 | g_log << Logger::Info << "TCP Connection Thread for client " << remote << " died because of network error: " << e.what() << endl; |
0afa9049 BH |
433 | } |
434 | ||
adc10f99 | 435 | catch(std::exception &e) { |
3d88c4c6 | 436 | s_P.lock()->reset(); // on next call, backend will be recycled |
a274da88 | 437 | g_log << Logger::Error << "TCP Connection Thread for client " << remote << " died because of STL error, cycling backend: " << e.what() << endl; |
12c86877 BH |
438 | } |
439 | catch( ... ) | |
440 | { | |
3d88c4c6 | 441 | s_P.lock()->reset(); // on next call, backend will be recycled |
a274da88 | 442 | g_log << Logger::Error << "TCP Connection Thread for client " << remote << " caught unknown exception, cycling backend." << endl; |
12c86877 | 443 | } |
12c86877 | 444 | d_connectionroom_sem->post(); |
a7b68ae7 RG |
445 | |
446 | try { | |
447 | closesocket(fd); | |
448 | } | |
449 | catch(const PDNSException& e) { | |
a274da88 | 450 | g_log << Logger::Error << "Error closing TCP socket for client " << remote << ": " << e.reason << endl; |
a7b68ae7 | 451 | } |
cb0af1a1 | 452 | decrementClientCount(remote); |
12c86877 BH |
453 | } |
454 | ||
78bcb858 | 455 | |
24fb5774 | 456 | bool TCPNameserver::canDoAXFR(std::unique_ptr<DNSPacket>& q, bool isAXFR, std::unique_ptr<PacketHandler>& packetHandler) |
12c86877 | 457 | { |
379ab445 | 458 | if(::arg().mustDo("disable-axfr")) |
318c3ec6 BH |
459 | return false; |
460 | ||
4172a5b2 | 461 | string logPrefix=string(isAXFR ? "A" : "I")+"XFR-out zone '"+q->qdomain.toLogString()+"', client '"+q->getInnerRemote().toStringWithPort()+"', "; |
efe7948e | 462 | |
78bcb858 BH |
463 | if(q->d_havetsig) { // if you have one, it must be good |
464 | TSIGRecordContent trc; | |
7abbc40f PD |
465 | DNSName keyname; |
466 | string secret; | |
24fb5774 | 467 | if(!q->checkForCorrectTSIG(packetHandler->getBackend(), &keyname, &secret, &trc)) { |
78bcb858 | 468 | return false; |
7f9ac49b AT |
469 | } else { |
470 | getTSIGHashEnum(trc.d_algoName, q->d_tsig_algo); | |
c113acc3 | 471 | #ifdef ENABLE_GSS_TSIG |
f13cde2a OM |
472 | if (g_doGssTSIG && q->d_tsig_algo == TSIG_GSS) { |
473 | GssContext gssctx(keyname); | |
474 | if (!gssctx.getPeerPrincipal(q->d_peer_principal)) { | |
475 | g_log<<Logger::Warning<<"Failed to extract peer principal from GSS context with keyname '"<<keyname<<"'"<<endl; | |
476 | } | |
477 | } | |
c113acc3 | 478 | #endif |
7f9ac49b AT |
479 | } |
480 | ||
24fb5774 | 481 | DNSSECKeeper dk(packetHandler->getBackend()); |
c113acc3 | 482 | #ifdef ENABLE_GSS_TSIG |
f13cde2a OM |
483 | if (g_doGssTSIG && q->d_tsig_algo == TSIG_GSS) { |
484 | vector<string> princs; | |
485 | packetHandler->getBackend()->getDomainMetadata(q->qdomain, "GSS-ALLOW-AXFR-PRINCIPAL", princs); | |
486 | for(const std::string& princ : princs) { | |
487 | if (q->d_peer_principal == princ) { | |
488 | g_log<<Logger::Warning<<"AXFR of domain '"<<q->qdomain<<"' allowed: TSIG signed request with authorized principal '"<<q->d_peer_principal<<"' and algorithm 'gss-tsig'"<<endl; | |
489 | return true; | |
490 | } | |
491 | } | |
492 | g_log<<Logger::Warning<<"AXFR of domain '"<<q->qdomain<<"' denied: TSIG signed request with principal '"<<q->d_peer_principal<<"' and algorithm 'gss-tsig' is not permitted"<<endl; | |
493 | return false; | |
494 | } | |
c113acc3 | 495 | #endif |
3d03fee8 | 496 | if(!dk.TSIGGrantsAccess(q->qdomain, keyname)) { |
efe7948e | 497 | g_log<<Logger::Warning<<logPrefix<<"denied: key with name '"<<keyname<<"' and algorithm '"<<getTSIGAlgoName(q->d_tsig_algo)<<"' does not grant access"<<endl; |
78bcb858 BH |
498 | return false; |
499 | } | |
500 | else { | |
efe7948e | 501 | g_log<<Logger::Notice<<logPrefix<<"allowed: TSIG signed request with authorized key '"<<keyname<<"' and algorithm '"<<getTSIGAlgoName(q->d_tsig_algo)<<"'"<<endl; |
78bcb858 BH |
502 | return true; |
503 | } | |
504 | } | |
1e05b07c | 505 | |
93afc0a3 | 506 | // cerr<<"checking allow-axfr-ips"<<endl; |
4172a5b2 | 507 | if(!(::arg()["allow-axfr-ips"].empty()) && d_ng.match( q->getInnerRemote() )) { |
efe7948e | 508 | g_log<<Logger::Notice<<logPrefix<<"allowed: client IP is in allow-axfr-ips"<<endl; |
12c86877 | 509 | return true; |
ab5edd12 | 510 | } |
93afc0a3 PD |
511 | |
512 | FindNS fns; | |
513 | ||
514 | // cerr<<"doing per-zone-axfr-acls"<<endl; | |
515 | SOAData sd; | |
24fb5774 | 516 | if(packetHandler->getBackend()->getSOAUncached(q->qdomain,sd)) { |
93afc0a3 | 517 | // cerr<<"got backend and SOA"<<endl; |
93afc0a3 | 518 | vector<string> acl; |
24fb5774 | 519 | packetHandler->getBackend()->getDomainMetadata(q->qdomain, "ALLOW-AXFR-FROM", acl); |
d7f67000 | 520 | for (const auto & i : acl) { |
93afc0a3 | 521 | // cerr<<"matching against "<<*i<<endl; |
d7f67000 | 522 | if(pdns_iequals(i, "AUTO-NS")) { |
93afc0a3 PD |
523 | // cerr<<"AUTO-NS magic please!"<<endl; |
524 | ||
525 | DNSResourceRecord rr; | |
7abbc40f | 526 | set<DNSName> nsset; |
93afc0a3 | 527 | |
13b80e77 CH |
528 | sd.db->lookup(QType(QType::NS), q->qdomain, sd.domain_id); |
529 | while (sd.db->get(rr)) { | |
290a083d | 530 | nsset.insert(DNSName(rr.content)); |
13b80e77 | 531 | } |
7abbc40f | 532 | for(const auto & j: nsset) { |
24fb5774 | 533 | vector<string> nsips=fns.lookup(j, packetHandler->getBackend()); |
d7f67000 | 534 | for(const auto & nsip : nsips) { |
93afc0a3 | 535 | // cerr<<"got "<<*k<<" from AUTO-NS"<<endl; |
4172a5b2 | 536 | if(nsip == q->getInnerRemote().toString()) |
93afc0a3 PD |
537 | { |
538 | // cerr<<"got AUTO-NS hit"<<endl; | |
efe7948e | 539 | g_log<<Logger::Notice<<logPrefix<<"allowed: client IP is in NSset"<<endl; |
93afc0a3 PD |
540 | return true; |
541 | } | |
542 | } | |
543 | } | |
544 | } | |
545 | else | |
546 | { | |
d7f67000 | 547 | Netmask nm = Netmask(i); |
4172a5b2 | 548 | if(nm.match( q->getInnerRemote() )) |
93afc0a3 | 549 | { |
efe7948e | 550 | g_log<<Logger::Notice<<logPrefix<<"allowed: client IP is in per-zone ACL"<<endl; |
93afc0a3 PD |
551 | // cerr<<"hit!"<<endl; |
552 | return true; | |
553 | } | |
554 | } | |
555 | } | |
1e05b07c | 556 | } |
93afc0a3 | 557 | |
12c86877 BH |
558 | extern CommunicatorClass Communicator; |
559 | ||
4172a5b2 | 560 | if(Communicator.justNotified(q->qdomain, q->getInnerRemote().toString())) { // we just notified this ip |
efe7948e | 561 | g_log<<Logger::Notice<<logPrefix<<"allowed: client IP is from recently notified secondary"<<endl; |
12c86877 BH |
562 | return true; |
563 | } | |
564 | ||
efe7948e | 565 | g_log<<Logger::Warning<<logPrefix<<"denied: client IP has no permission"<<endl; |
12c86877 BH |
566 | return false; |
567 | } | |
568 | ||
b317b510 | 569 | namespace { |
54d84273 PD |
570 | struct NSECXEntry |
571 | { | |
22a0ef16 | 572 | NSECBitmap d_set; |
54d84273 | 573 | unsigned int d_ttl; |
feef1ece | 574 | bool d_auth; |
54d84273 | 575 | }; |
8e9b7d99 | 576 | |
a5188bcd | 577 | static std::unique_ptr<DNSPacket> getFreshAXFRPacket(std::unique_ptr<DNSPacket>& q) |
54d84273 | 578 | { |
c2826d2e | 579 | std::unique_ptr<DNSPacket> ret = std::unique_ptr<DNSPacket>(q->replyPacket()); |
54d84273 PD |
580 | ret->setCompress(false); |
581 | ret->d_dnssecOk=false; // RFC 5936, 2.2.5 | |
582 | ret->d_tcp = true; | |
583 | return ret; | |
584 | } | |
8e9b7d99 BH |
585 | } |
586 | ||
54d84273 | 587 | |
12c86877 | 588 | /** do the actual zone transfer. Return 0 in case of error, 1 in case of success */ |
5cf23dba | 589 | int TCPNameserver::doAXFR(const DNSName &target, std::unique_ptr<DNSPacket>& q, int outsock) // NOLINT(readability-function-cognitive-complexity) |
12c86877 | 590 | { |
c6ca0aa8 | 591 | string logPrefix="AXFR-out zone '"+target.toLogString()+"', client '"+q->getRemoteStringWithPort()+"', "; |
efe7948e | 592 | |
c2826d2e | 593 | std::unique_ptr<DNSPacket> outpacket= getFreshAXFRPacket(q); |
c67e46a1 | 594 | if(q->d_dnssecOk) |
05e24311 | 595 | outpacket->d_dnssecOk=true; // RFC 5936, 2.2.5 'SHOULD' |
22893145 | 596 | |
efe7948e | 597 | g_log<<Logger::Warning<<logPrefix<<"transfer initiated"<<endl; |
12c86877 | 598 | |
22893145 | 599 | // determine if zone exists and AXFR is allowed using existing backend before spawning a new backend. |
91ad8c11 | 600 | SOAData sd; |
12c86877 | 601 | { |
24fb5774 | 602 | auto packetHandler = s_P.lock(); |
efe7948e | 603 | DLOG(g_log<<logPrefix<<"looking for SOA"<<endl); // find domain_id via SOA and list complete domain. No SOA, no AXFR |
24fb5774 | 604 | if(!*packetHandler) { |
994cae6b | 605 | g_log<<Logger::Warning<<"TCP server is without backend connections in doAXFR, launching"<<endl; |
24fb5774 | 606 | *packetHandler = make_unique<PacketHandler>(); |
12a965c5 | 607 | } |
12c86877 | 608 | |
ea99d474 | 609 | // canDoAXFR does all the ACL checks, and has the if(disable-axfr) shortcut, call it first. |
24fb5774 | 610 | if (!canDoAXFR(q, true, *packetHandler)) { |
efe7948e | 611 | g_log<<Logger::Warning<<logPrefix<<"failed: client may not request AXFR"<<endl; |
9c556f63 | 612 | outpacket->setRcode(RCode::NotAuth); |
8090f5a2 AT |
613 | sendPacket(outpacket,outsock); |
614 | return 0; | |
615 | } | |
616 | ||
91ad8c11 | 617 | if (!(*packetHandler)->getBackend()->getSOAUncached(target, sd)) { |
efe7948e | 618 | g_log<<Logger::Warning<<logPrefix<<"failed: not authoritative"<<endl; |
9c556f63 | 619 | outpacket->setRcode(RCode::NotAuth); |
ff76e8b4 | 620 | sendPacket(outpacket,outsock); |
12c86877 BH |
621 | return 0; |
622 | } | |
3de83124 | 623 | } |
22893145 | 624 | |
8e9b7d99 | 625 | UeberBackend db; |
79ba7763 | 626 | if(!db.getSOAUncached(target, sd)) { |
efe7948e | 627 | g_log<<Logger::Warning<<logPrefix<<"failed: not authoritative in second instance"<<endl; |
79ba7763 | 628 | outpacket->setRcode(RCode::NotAuth); |
ff76e8b4 | 629 | sendPacket(outpacket,outsock); |
3de83124 | 630 | return 0; |
12c86877 | 631 | } |
3de83124 | 632 | |
8a66a927 KM |
633 | bool securedZone = false; |
634 | bool presignedZone = false; | |
635 | bool NSEC3Zone = false; | |
636 | bool narrow = false; | |
637 | ||
91ad8c11 KM |
638 | DomainInfo di; |
639 | bool isCatalogZone = sd.db->getDomainInfo(target, di, false) && di.isCatalogType(); | |
640 | ||
8a66a927 KM |
641 | NSEC3PARAMRecordContent ns3pr; |
642 | ||
ea99d474 | 643 | DNSSECKeeper dk(&db); |
40b3959a | 644 | DNSSECKeeper::clearCaches(target); |
91ad8c11 | 645 | if (!isCatalogZone) { |
8a66a927 KM |
646 | securedZone = dk.isSecuredZone(target); |
647 | presignedZone = dk.isPresigned(target); | |
648 | } | |
22893145 | 649 | |
dacacb23 | 650 | if(securedZone && dk.getNSEC3PARAM(target, &ns3pr, &narrow)) { |
22893145 CH |
651 | NSEC3Zone=true; |
652 | if(narrow) { | |
efe7948e | 653 | g_log<<Logger::Warning<<logPrefix<<"failed: not doing AXFR of an NSEC3 narrow zone"<<endl; |
994cae6b KM |
654 | outpacket->setRcode(RCode::Refused); |
655 | sendPacket(outpacket,outsock); | |
656 | return 0; | |
22893145 CH |
657 | } |
658 | } | |
659 | ||
78bcb858 | 660 | TSIGRecordContent trc; |
7abbc40f PD |
661 | DNSName tsigkeyname; |
662 | string tsigsecret; | |
78bcb858 | 663 | |
ea3816cf | 664 | bool haveTSIGDetails = q->getTSIGDetails(&trc, &tsigkeyname); |
78bcb858 | 665 | |
60a1c204 | 666 | if(haveTSIGDetails && !tsigkeyname.empty()) { |
2c26f25a | 667 | string tsig64; |
5e8d94f1 | 668 | DNSName algorithm=trc.d_algoName; |
290a083d | 669 | if (algorithm == DNSName("hmac-md5.sig-alg.reg.int")) |
670 | algorithm = DNSName("hmac-md5"); | |
f13cde2a OM |
671 | if (algorithm != DNSName("gss-tsig")) { |
672 | if(!db.getTSIGKey(tsigkeyname, algorithm, tsig64)) { | |
673 | g_log<<Logger::Warning<<logPrefix<<"TSIG key not found"<<endl; | |
674 | return 0; | |
675 | } | |
676 | if (B64Decode(tsig64, tsigsecret) == -1) { | |
677 | g_log<<Logger::Error<<logPrefix<<"unable to Base-64 decode TSIG key '"<<tsigkeyname<<"'"<<endl; | |
678 | return 0; | |
679 | } | |
84fc3f8b | 680 | } |
78bcb858 | 681 | } |
1e05b07c FM |
682 | |
683 | ||
8267bd2c | 684 | // SOA *must* go out first, our signing pipe might reorder |
efe7948e | 685 | DLOG(g_log<<logPrefix<<"sending out SOA"<<endl); |
13f9e280 | 686 | DNSZoneRecord soa = makeEditedDNSZRFromSOAData(dk, sd); |
9bbcf03a | 687 | outpacket->addRecord(DNSZoneRecord(soa)); |
3c68fb14 | 688 | if(securedZone && !presignedZone) { |
7abbc40f | 689 | set<DNSName> authSet; |
8d3cbffa | 690 | authSet.insert(target); |
ea99d474 | 691 | addRRSigs(dk, db, authSet, outpacket->getRRS()); |
8d3cbffa | 692 | } |
1e05b07c | 693 | |
60a1c204 | 694 | if(haveTSIGDetails && !tsigkeyname.empty()) |
78bcb858 | 695 | outpacket->setTSIGDetails(trc, tsigkeyname, tsigsecret, trc.d_mac); // first answer is 'normal' |
1e05b07c | 696 | |
02b4b703 | 697 | sendPacket(outpacket, outsock, false); |
1e05b07c | 698 | |
78bcb858 | 699 | trc.d_mac = outpacket->d_trc.d_mac; |
8267bd2c | 700 | outpacket = getFreshAXFRPacket(q); |
04f5504d | 701 | |
1e05b07c | 702 | |
90ba52e0 | 703 | DNSZoneRecord zrr; |
04f5504d | 704 | vector<DNSZoneRecord> zrrs; |
794c2f92 | 705 | |
04f5504d KM |
706 | zrr.dr.d_name = target; |
707 | zrr.dr.d_ttl = sd.minimum; | |
95b70d3a | 708 | |
04f5504d KM |
709 | if(securedZone && !presignedZone) { // this is where the DNSKEYs, CDNSKEYs and CDSs go in |
710 | bool doCDNSKEY = true, doCDS = true; | |
95b70d3a KM |
711 | string publishCDNSKEY, publishCDS; |
712 | dk.getPublishCDNSKEY(q->qdomain, publishCDNSKEY); | |
713 | dk.getPublishCDS(q->qdomain, publishCDS); | |
04f5504d | 714 | |
95b70d3a | 715 | set<uint32_t> entryPointIds; |
04f5504d KM |
716 | DNSSECKeeper::keyset_t entryPoints = dk.getEntryPoints(target); |
717 | for (auto const& value : entryPoints) { | |
95b70d3a | 718 | entryPointIds.insert(value.second.id); |
04f5504d | 719 | } |
95b70d3a | 720 | |
04f5504d | 721 | DNSSECKeeper::keyset_t keys = dk.getKeys(target); |
95b70d3a KM |
722 | for(const DNSSECKeeper::keyset_t::value_type& value : keys) { |
723 | if (!value.second.published) { | |
724 | continue; | |
991a0977 | 725 | } |
95b70d3a | 726 | zrr.dr.d_type = QType::DNSKEY; |
d06dcda4 | 727 | zrr.dr.setContent(std::make_shared<DNSKEYRecordContent>(value.first.getDNSKEY())); |
95b70d3a | 728 | DNSName keyname = NSEC3Zone ? DNSName(toBase32Hex(hashQNameWithSalt(ns3pr, zrr.dr.d_name))) : zrr.dr.d_name; |
64d22929 | 729 | zrrs.push_back(zrr); |
95b70d3a KM |
730 | |
731 | // generate CDS and CDNSKEY records | |
04f5504d | 732 | if(doCDNSKEY && entryPointIds.count(value.second.id) > 0){ |
481508ab | 733 | if(!publishCDNSKEY.empty()) { |
95b70d3a | 734 | zrr.dr.d_type=QType::CDNSKEY; |
481508ab | 735 | if (publishCDNSKEY == "0") { |
04f5504d | 736 | doCDNSKEY = false; |
d06dcda4 | 737 | zrr.dr.setContent(PacketHandler::s_deleteCDNSKEYContent); |
04f5504d | 738 | zrrs.push_back(zrr); |
481508ab | 739 | } else { |
d06dcda4 | 740 | zrr.dr.setContent(std::make_shared<DNSKEYRecordContent>(value.first.getDNSKEY())); |
04f5504d | 741 | zrrs.push_back(zrr); |
481508ab | 742 | } |
95b70d3a KM |
743 | } |
744 | ||
04f5504d | 745 | if(doCDS && !publishCDS.empty()){ |
95b70d3a KM |
746 | zrr.dr.d_type=QType::CDS; |
747 | vector<string> digestAlgos; | |
748 | stringtok(digestAlgos, publishCDS, ", "); | |
481508ab | 749 | if(std::find(digestAlgos.begin(), digestAlgos.end(), "0") != digestAlgos.end()) { |
cd7c3624 | 750 | doCDS = false; |
d06dcda4 | 751 | zrr.dr.setContent(PacketHandler::s_deleteCDSContent); |
04f5504d | 752 | zrrs.push_back(zrr); |
481508ab KM |
753 | } else { |
754 | for(auto const &digestAlgo : digestAlgos) { | |
d06dcda4 | 755 | zrr.dr.setContent(std::make_shared<DSRecordContent>(makeDSFromDNSKey(target, value.first.getDNSKEY(), pdns::checked_stoi<uint8_t>(digestAlgo)))); |
04f5504d | 756 | zrrs.push_back(zrr); |
481508ab | 757 | } |
95b70d3a | 758 | } |
991a0977 PL |
759 | } |
760 | } | |
761 | } | |
95b70d3a | 762 | |
6dae726d PD |
763 | } |
764 | ||
95c5bc40 | 765 | if(NSEC3Zone) { // now stuff in the NSEC3PARAM |
04f5504d | 766 | uint8_t flags = ns3pr.d_flags; |
90ba52e0 | 767 | zrr.dr.d_type = QType::NSEC3PARAM; |
95c5bc40 | 768 | ns3pr.d_flags = 0; |
d06dcda4 | 769 | zrr.dr.setContent(std::make_shared<NSEC3PARAMRecordContent>(ns3pr)); |
b8adb30d | 770 | ns3pr.d_flags = flags; |
6e8694df | 771 | DNSName keyname = DNSName(toBase32Hex(hashQNameWithSalt(ns3pr, zrr.dr.d_name))); |
64d22929 | 772 | zrrs.push_back(zrr); |
ce464268 | 773 | } |
1e05b07c | 774 | |
8a66a927 KM |
775 | const bool rectify = !(presignedZone || ::arg().mustDo("disable-axfr-rectify")); |
776 | set<DNSName> qnames, nsset, terms; | |
777 | ||
778 | // Catalog zone start | |
779 | if (di.kind == DomainInfo::Producer) { | |
780 | // Ignore all records except NS at apex | |
781 | sd.db->lookup(QType::NS, target, di.id); | |
782 | while (sd.db->get(zrr)) { | |
783 | zrrs.emplace_back(zrr); | |
784 | } | |
785 | if (zrrs.empty()) { | |
786 | zrr.dr.d_name = target; | |
787 | zrr.dr.d_ttl = 0; | |
788 | zrr.dr.d_type = QType::NS; | |
d06dcda4 | 789 | zrr.dr.setContent(std::make_shared<NSRecordContent>("invalid.")); |
8a66a927 KM |
790 | zrrs.emplace_back(zrr); |
791 | } | |
792 | ||
793 | zrrs.emplace_back(CatalogInfo::getCatalogVersionRecord(target)); | |
794 | ||
795 | vector<CatalogInfo> members; | |
796 | sd.db->getCatalogMembers(target, members, CatalogInfo::CatalogType::Producer); | |
797 | for (const auto& ci : members) { | |
798 | ci.toDNSZoneRecords(target, zrrs); | |
799 | } | |
800 | if (members.empty()) { | |
801 | g_log << Logger::Warning << logPrefix << "catalog zone '" << target << "' has no members" << endl; | |
802 | } | |
803 | goto send; | |
804 | } | |
805 | // Catalog zone end | |
806 | ||
0c350cb5 | 807 | // now start list zone |
91ad8c11 | 808 | if (!sd.db->list(target, sd.domain_id, isCatalogZone)) { |
efe7948e | 809 | g_log<<Logger::Error<<logPrefix<<"backend signals error condition, aborting AXFR"<<endl; |
9c556f63 | 810 | outpacket->setRcode(RCode::ServFail); |
0c350cb5 BH |
811 | sendPacket(outpacket,outsock); |
812 | return 0; | |
813 | } | |
814 | ||
90ba52e0 | 815 | while(sd.db->get(zrr)) { |
64d22929 KM |
816 | if (!presignedZone) { |
817 | if (zrr.dr.d_type == QType::RRSIG) { | |
818 | continue; | |
819 | } | |
820 | if (zrr.dr.d_type == QType::DNSKEY || zrr.dr.d_type == QType::CDNSKEY || zrr.dr.d_type == QType::CDS) { | |
821 | if(!::arg().mustDo("direct-dnskey")) { | |
822 | continue; | |
823 | } else { | |
824 | zrr.dr.d_ttl = sd.minimum; | |
825 | } | |
826 | } | |
827 | } | |
8bf260dd | 828 | zrr.dr.d_name.makeUsLowerCase(); |
90ba52e0 | 829 | if(zrr.dr.d_name.isPartOf(target)) { |
833b07fe | 830 | if (zrr.dr.d_type == QType::ALIAS && (::arg().mustDo("outgoing-axfr-expand-alias") || ::arg()["outgoing-axfr-expand-alias"] == "ignore-errors")) { |
90ba52e0 | 831 | vector<DNSZoneRecord> ips; |
d06dcda4 RG |
832 | int ret1 = stubDoResolve(getRR<ALIASRecordContent>(zrr.dr)->getContent(), QType::A, ips); |
833 | int ret2 = stubDoResolve(getRR<ALIASRecordContent>(zrr.dr)->getContent(), QType::AAAA, ips); | |
833b07fe | 834 | if (ret1 != RCode::NoError || ret2 != RCode::NoError) { |
50ff05d7 | 835 | if (::arg()["outgoing-axfr-expand-alias"] == "ignore-errors") { |
833b07fe | 836 | if (ret1 != RCode::NoError) { |
50ff05d7 | 837 | g_log << Logger::Error << logPrefix << zrr.dr.d_name.toLogString() << ": error resolving A record for ALIAS target " << zrr.dr.getContent()->getZoneRepresentation() << ", continuing AXFR" << endl; |
833b07fe KD |
838 | } |
839 | if (ret2 != RCode::NoError) { | |
50ff05d7 | 840 | g_log << Logger::Error << logPrefix << zrr.dr.d_name.toLogString() << ": error resolving AAAA record for ALIAS target " << zrr.dr.getContent()->getZoneRepresentation() << ", continuing AXFR" << endl; |
833b07fe KD |
841 | } |
842 | } | |
50ff05d7 CH |
843 | else { |
844 | g_log << Logger::Warning << logPrefix << zrr.dr.d_name.toLogString() << ": error resolving for ALIAS " << zrr.dr.getContent()->getZoneRepresentation() << ", aborting AXFR" << endl; | |
845 | outpacket->setRcode(RCode::ServFail); | |
846 | sendPacket(outpacket, outsock); | |
847 | return 0; | |
848 | } | |
273d88b2 | 849 | } |
d06dcda4 | 850 | for (auto& ip: ips) { |
90ba52e0 | 851 | zrr.dr.d_type = ip.dr.d_type; |
d06dcda4 | 852 | zrr.dr.setContent(ip.dr.getContent()); |
90ba52e0 | 853 | zrrs.push_back(zrr); |
d86e1bf7 | 854 | } |
a68df29d | 855 | continue; |
d86e1bf7 PD |
856 | } |
857 | ||
b772ffea | 858 | if (rectify) { |
90ba52e0 | 859 | if (zrr.dr.d_type) { |
860 | qnames.insert(zrr.dr.d_name); | |
861 | if(zrr.dr.d_type == QType::NS && zrr.dr.d_name!=target) | |
862 | nsset.insert(zrr.dr.d_name); | |
b772ffea KM |
863 | } else { |
864 | // remove existing ents | |
865 | continue; | |
866 | } | |
867 | } | |
a68df29d | 868 | zrrs.push_back(zrr); |
b772ffea | 869 | } else { |
90ba52e0 | 870 | if (zrr.dr.d_type) |
efe7948e | 871 | g_log<<Logger::Warning<<logPrefix<<"zone contains out-of-zone data '"<<zrr.dr.d_name<<"|"<<DNSRecordContent::NumberToType(zrr.dr.d_type)<<"', ignoring"<<endl; |
b772ffea KM |
872 | } |
873 | } | |
874 | ||
d06dcda4 | 875 | for (auto& loopRR : zrrs) { |
bdbee377 PL |
876 | if ((loopRR.dr.d_type == QType::SVCB || loopRR.dr.d_type == QType::HTTPS)) { |
877 | // Process auto hints | |
878 | // TODO this is an almost copy of the code in the packethandler | |
879 | auto rrc = getRR<SVCBBaseRecordContent>(loopRR.dr); | |
880 | if (rrc == nullptr) { | |
881 | continue; | |
882 | } | |
d06dcda4 RG |
883 | auto newRRC = rrc->clone(); |
884 | if (!newRRC) { | |
885 | continue; | |
886 | } | |
887 | DNSName svcTarget = newRRC->getTarget().isRoot() ? loopRR.dr.d_name : newRRC->getTarget(); | |
888 | if (newRRC->autoHint(SvcParam::ipv4hint)) { | |
bdbee377 PL |
889 | sd.db->lookup(QType::A, svcTarget, sd.domain_id); |
890 | vector<ComboAddress> hints; | |
891 | DNSZoneRecord rr; | |
892 | while (sd.db->get(rr)) { | |
893 | auto arrc = getRR<ARecordContent>(rr.dr); | |
894 | hints.push_back(arrc->getCA()); | |
895 | } | |
896 | if (hints.size() == 0) { | |
d06dcda4 | 897 | newRRC->removeParam(SvcParam::ipv4hint); |
bdbee377 | 898 | } else { |
d06dcda4 | 899 | newRRC->setHints(SvcParam::ipv4hint, hints); |
bdbee377 PL |
900 | } |
901 | } | |
902 | ||
d06dcda4 | 903 | if (newRRC->autoHint(SvcParam::ipv6hint)) { |
bdbee377 PL |
904 | sd.db->lookup(QType::AAAA, svcTarget, sd.domain_id); |
905 | vector<ComboAddress> hints; | |
906 | DNSZoneRecord rr; | |
907 | while (sd.db->get(rr)) { | |
908 | auto arrc = getRR<AAAARecordContent>(rr.dr); | |
909 | hints.push_back(arrc->getCA()); | |
910 | } | |
911 | if (hints.size() == 0) { | |
d06dcda4 | 912 | newRRC->removeParam(SvcParam::ipv6hint); |
bdbee377 | 913 | } else { |
d06dcda4 | 914 | newRRC->setHints(SvcParam::ipv6hint, hints); |
bdbee377 PL |
915 | } |
916 | } | |
d06dcda4 RG |
917 | |
918 | loopRR.dr.setContent(std::move(newRRC)); | |
bdbee377 PL |
919 | } |
920 | } | |
921 | ||
75f2589f | 922 | // Group records by name and type, signpipe stumbles over interrupted rrsets |
22a676e0 | 923 | if(securedZone && !presignedZone) { |
8daafcc1 | 924 | sort(zrrs.begin(), zrrs.end(), [](const DNSZoneRecord& a, const DNSZoneRecord& b) { |
905dae56 | 925 | return std::tie(a.dr.d_name, a.dr.d_type) < std::tie(b.dr.d_name, b.dr.d_type); |
8daafcc1 KM |
926 | }); |
927 | } | |
75f2589f | 928 | |
b772ffea KM |
929 | if(rectify) { |
930 | // set auth | |
2010ac95 RG |
931 | for(DNSZoneRecord &loopZRR : zrrs) { |
932 | loopZRR.auth=true; | |
933 | if (loopZRR.dr.d_type != QType::NS || loopZRR.dr.d_name!=target) { | |
934 | DNSName shorter(loopZRR.dr.d_name); | |
b772ffea | 935 | do { |
e325f20c | 936 | if (shorter==target) // apex is always auth |
cb045f61 | 937 | break; |
2010ac95 RG |
938 | if(nsset.count(shorter) && !(loopZRR.dr.d_name==shorter && loopZRR.dr.d_type == QType::DS)) { |
939 | loopZRR.auth=false; | |
cb045f61 | 940 | break; |
9f70b77a | 941 | } |
7abbc40f | 942 | } while(shorter.chopOff()); |
9f70b77a | 943 | } |
b772ffea KM |
944 | } |
945 | ||
946 | if(NSEC3Zone) { | |
947 | // ents are only required for NSEC3 zones | |
948 | uint32_t maxent = ::arg().asNum("max-ent-entries"); | |
6ded341a | 949 | set<DNSName> nsec3set, nonterm; |
2010ac95 | 950 | for (auto &loopZRR: zrrs) { |
6ded341a | 951 | bool skip=false; |
2010ac95 | 952 | DNSName shorter = loopZRR.dr.d_name; |
6ded341a KM |
953 | if (shorter != target && shorter.chopOff() && shorter != target) { |
954 | do { | |
955 | if(nsset.count(shorter)) { | |
956 | skip=true; | |
957 | break; | |
958 | } | |
959 | } while(shorter.chopOff() && shorter != target); | |
960 | } | |
2010ac95 RG |
961 | shorter = loopZRR.dr.d_name; |
962 | if(!skip && (loopZRR.dr.d_type != QType::NS || !ns3pr.d_flags)) { | |
6ded341a KM |
963 | do { |
964 | if(!nsec3set.count(shorter)) { | |
965 | nsec3set.insert(shorter); | |
966 | } | |
967 | } while(shorter != target && shorter.chopOff()); | |
968 | } | |
969 | } | |
970 | ||
2010ac95 RG |
971 | for(DNSZoneRecord &loopZRR : zrrs) { |
972 | DNSName shorter(loopZRR.dr.d_name); | |
e325f20c | 973 | while(shorter != target && shorter.chopOff()) { |
6ded341a | 974 | if(!qnames.count(shorter) && !nonterm.count(shorter) && nsec3set.count(shorter)) { |
b772ffea | 975 | if(!(maxent)) { |
efe7948e KM |
976 | g_log<<Logger::Warning<<logPrefix<<"zone has too many empty non terminals, aborting AXFR"<<endl; |
977 | outpacket->setRcode(RCode::ServFail); | |
978 | sendPacket(outpacket,outsock); | |
b772ffea KM |
979 | return 0; |
980 | } | |
6ded341a KM |
981 | nonterm.insert(shorter); |
982 | --maxent; | |
b772ffea KM |
983 | } |
984 | } | |
985 | } | |
986 | ||
9e23e712 | 987 | for(const auto& nt : nonterm) { |
2010ac95 RG |
988 | DNSZoneRecord tempRR; |
989 | tempRR.dr.d_name=nt; | |
990 | tempRR.dr.d_type=QType::ENT; | |
991 | tempRR.auth=true; | |
992 | zrrs.push_back(tempRR); | |
b772ffea KM |
993 | } |
994 | } | |
995 | } | |
996 | ||
8a66a927 | 997 | send: |
b772ffea | 998 | |
12c86877 | 999 | /* now write all other records */ |
04f5504d KM |
1000 | |
1001 | typedef map<DNSName, NSECXEntry, CanonDNSNameCompare> nsecxrepo_t; | |
1002 | nsecxrepo_t nsecxrepo; | |
1003 | ||
3af419da | 1004 | ChunkedSigningPipe csp(target, (securedZone && !presignedZone), ::arg().asNum("signing-threads", 1), ::arg().mustDo("workaround-11804") ? 1 : 100); |
04f5504d | 1005 | |
6e8694df | 1006 | DNSName keyname; |
3370c993 | 1007 | unsigned int udiff; |
1c6d9830 BH |
1008 | DTime dt; |
1009 | dt.set(); | |
2010ac95 | 1010 | for(DNSZoneRecord &loopZRR : zrrs) { |
2010ac95 RG |
1011 | if(securedZone && (loopZRR.auth || loopZRR.dr.d_type == QType::NS)) { |
1012 | if (NSEC3Zone || loopZRR.dr.d_type) { | |
3c68fb14 KM |
1013 | if (presignedZone && NSEC3Zone && loopZRR.dr.d_type == QType::RRSIG && getRR<RRSIGRecordContent>(loopZRR.dr)->d_type == QType::NSEC3) { |
1014 | keyname = loopZRR.dr.d_name.makeRelative(sd.qname); | |
1015 | } else { | |
1016 | keyname = NSEC3Zone ? DNSName(toBase32Hex(hashQNameWithSalt(ns3pr, loopZRR.dr.d_name))) : loopZRR.dr.d_name; | |
1017 | } | |
b5baefaf | 1018 | NSECXEntry& ne = nsecxrepo[keyname]; |
192bcba2 | 1019 | ne.d_ttl = sd.getNegativeTTL(); |
3c68fb14 KM |
1020 | ne.d_auth = (ne.d_auth || loopZRR.auth || (NSEC3Zone && (!ns3pr.d_flags))); |
1021 | if (loopZRR.dr.d_type && loopZRR.dr.d_type != QType::RRSIG) { | |
22a0ef16 | 1022 | ne.d_set.set(loopZRR.dr.d_type); |
b5baefaf PD |
1023 | } |
1024 | } | |
b317b510 | 1025 | } |
b5baefaf | 1026 | |
2010ac95 | 1027 | if (!loopZRR.dr.d_type) |
b5baefaf PD |
1028 | continue; // skip empty non-terminals |
1029 | ||
2010ac95 | 1030 | if(loopZRR.dr.d_type == QType::SOA) |
12c86877 | 1031 | continue; // skip SOA - would indicate end of AXFR |
add640c0 | 1032 | |
2010ac95 | 1033 | if(csp.submit(loopZRR)) { |
1c6d9830 BH |
1034 | for(;;) { |
1035 | outpacket->getRRS() = csp.getChunk(); | |
1036 | if(!outpacket->getRRS().empty()) { | |
60a1c204 | 1037 | if(haveTSIGDetails && !tsigkeyname.empty()) |
54d84273 | 1038 | outpacket->setTSIGDetails(trc, tsigkeyname, tsigsecret, trc.d_mac, true); |
02b4b703 | 1039 | sendPacket(outpacket, outsock, false); |
78bcb858 | 1040 | trc.d_mac=outpacket->d_trc.d_mac; |
1c6d9830 BH |
1041 | outpacket=getFreshAXFRPacket(q); |
1042 | } | |
1043 | else | |
1044 | break; | |
1045 | } | |
12c86877 BH |
1046 | } |
1047 | } | |
78bcb858 | 1048 | /* |
3370c993 | 1049 | udiff=dt.udiffNoReset(); |
1c6d9830 BH |
1050 | cerr<<"Starting NSEC: "<<csp.d_signed/(udiff/1000000.0)<<" sigs/s, "<<csp.d_signed<<" / "<<udiff/1000000.0<<endl; |
1051 | cerr<<"Outstanding: "<<csp.d_outstanding<<", "<<csp.d_queued - csp.d_signed << endl; | |
1052 | cerr<<"Ready for consumption: "<<csp.getReady()<<endl; | |
78bcb858 | 1053 | */ |
feef1ece | 1054 | if(securedZone) { |
4888e4b2 | 1055 | if(NSEC3Zone) { |
9d3151d9 | 1056 | for(nsecxrepo_t::const_iterator iter = nsecxrepo.begin(); iter != nsecxrepo.end(); ++iter) { |
3c68fb14 | 1057 | if(iter->second.d_auth) { |
feef1ece | 1058 | NSEC3RecordContent n3rc; |
22a0ef16 | 1059 | n3rc.set(iter->second.d_set); |
27d4a65b RG |
1060 | const auto numberOfTypesSet = n3rc.numberOfTypesSet(); |
1061 | if (numberOfTypesSet != 0 && (numberOfTypesSet != 1 || !n3rc.isSet(QType::NS))) { | |
1062 | n3rc.set(QType::RRSIG); | |
1063 | } | |
1064 | n3rc.d_salt = ns3pr.d_salt; | |
feef1ece PD |
1065 | n3rc.d_flags = ns3pr.d_flags; |
1066 | n3rc.d_iterations = ns3pr.d_iterations; | |
690b86b7 | 1067 | n3rc.d_algorithm = DNSSECKeeper::DIGEST_SHA1; // SHA1, fixed in PowerDNS for now |
feef1ece | 1068 | nsecxrepo_t::const_iterator inext = iter; |
cb167afd | 1069 | ++inext; |
feef1ece PD |
1070 | if(inext == nsecxrepo.end()) |
1071 | inext = nsecxrepo.begin(); | |
3c68fb14 | 1072 | while(!inext->second.d_auth && inext != iter) |
feef1ece | 1073 | { |
cb167afd | 1074 | ++inext; |
feef1ece PD |
1075 | if(inext == nsecxrepo.end()) |
1076 | inext = nsecxrepo.begin(); | |
1077 | } | |
6e8694df KM |
1078 | n3rc.d_nexthash = fromBase32Hex(inext->first.toStringNoDot()); |
1079 | zrr.dr.d_name = iter->first+sd.qname; | |
90ba52e0 | 1080 | |
192bcba2 | 1081 | zrr.dr.d_ttl = sd.getNegativeTTL(); |
d06dcda4 | 1082 | zrr.dr.setContent(std::make_shared<NSEC3RecordContent>(std::move(n3rc))); |
90ba52e0 | 1083 | zrr.dr.d_type = QType::NSEC3; |
1084 | zrr.dr.d_place = DNSResourceRecord::ANSWER; | |
1085 | zrr.auth=true; | |
1086 | if(csp.submit(zrr)) { | |
feef1ece PD |
1087 | for(;;) { |
1088 | outpacket->getRRS() = csp.getChunk(); | |
1089 | if(!outpacket->getRRS().empty()) { | |
60a1c204 | 1090 | if(haveTSIGDetails && !tsigkeyname.empty()) |
feef1ece | 1091 | outpacket->setTSIGDetails(trc, tsigkeyname, tsigsecret, trc.d_mac, true); |
02b4b703 | 1092 | sendPacket(outpacket, outsock, false); |
feef1ece PD |
1093 | trc.d_mac=outpacket->d_trc.d_mac; |
1094 | outpacket=getFreshAXFRPacket(q); | |
1095 | } | |
1096 | else | |
1097 | break; | |
1c6d9830 | 1098 | } |
1c6d9830 | 1099 | } |
8e9b7d99 | 1100 | } |
4888e4b2 BH |
1101 | } |
1102 | } | |
9d3151d9 | 1103 | else for(nsecxrepo_t::const_iterator iter = nsecxrepo.begin(); iter != nsecxrepo.end(); ++iter) { |
ed9c3a50 | 1104 | NSECRecordContent nrc; |
22a0ef16 | 1105 | nrc.set(iter->second.d_set); |
27d4a65b RG |
1106 | nrc.set(QType::RRSIG); |
1107 | nrc.set(QType::NSEC); | |
6e8694df KM |
1108 | |
1109 | if(boost::next(iter) != nsecxrepo.end()) | |
1110 | nrc.d_next = boost::next(iter)->first; | |
ed9c3a50 | 1111 | else |
6e8694df KM |
1112 | nrc.d_next=nsecxrepo.begin()->first; |
1113 | zrr.dr.d_name = iter->first; | |
1114 | ||
192bcba2 | 1115 | zrr.dr.d_ttl = sd.getNegativeTTL(); |
d06dcda4 | 1116 | zrr.dr.setContent(std::make_shared<NSECRecordContent>(std::move(nrc))); |
90ba52e0 | 1117 | zrr.dr.d_type = QType::NSEC; |
1118 | zrr.dr.d_place = DNSResourceRecord::ANSWER; | |
1119 | zrr.auth=true; | |
1120 | if(csp.submit(zrr)) { | |
1c6d9830 BH |
1121 | for(;;) { |
1122 | outpacket->getRRS() = csp.getChunk(); | |
1123 | if(!outpacket->getRRS().empty()) { | |
60a1c204 | 1124 | if(haveTSIGDetails && !tsigkeyname.empty()) |
1e05b07c | 1125 | outpacket->setTSIGDetails(trc, tsigkeyname, tsigsecret, trc.d_mac, true); |
02b4b703 | 1126 | sendPacket(outpacket, outsock, false); |
78bcb858 | 1127 | trc.d_mac=outpacket->d_trc.d_mac; |
1c6d9830 BH |
1128 | outpacket=getFreshAXFRPacket(q); |
1129 | } | |
1130 | else | |
1131 | break; | |
1132 | } | |
8e9b7d99 | 1133 | } |
add640c0 | 1134 | } |
add640c0 | 1135 | } |
78bcb858 | 1136 | /* |
3370c993 | 1137 | udiff=dt.udiffNoReset(); |
1c6d9830 BH |
1138 | cerr<<"Flushing pipe: "<<csp.d_signed/(udiff/1000000.0)<<" sigs/s, "<<csp.d_signed<<" / "<<udiff/1000000.0<<endl; |
1139 | cerr<<"Outstanding: "<<csp.d_outstanding<<", "<<csp.d_queued - csp.d_signed << endl; | |
1140 | cerr<<"Ready for consumption: "<<csp.getReady()<<endl; | |
78bcb858 | 1141 | * */ |
1e05b07c | 1142 | for(;;) { |
bec14a20 BH |
1143 | outpacket->getRRS() = csp.getChunk(true); // flush the pipe |
1144 | if(!outpacket->getRRS().empty()) { | |
60a1c204 | 1145 | if(haveTSIGDetails && !tsigkeyname.empty()) |
78bcb858 | 1146 | outpacket->setTSIGDetails(trc, tsigkeyname, tsigsecret, trc.d_mac, true); // first answer is 'normal' |
1f07a63f PD |
1147 | try { |
1148 | sendPacket(outpacket, outsock, false); | |
1149 | } | |
1150 | catch (PDNSException& pe) { | |
1151 | throw PDNSException("during axfr-out of "+target.toString()+", this happened: "+pe.reason); | |
1152 | } | |
78bcb858 | 1153 | trc.d_mac=outpacket->d_trc.d_mac; |
bec14a20 BH |
1154 | outpacket=getFreshAXFRPacket(q); |
1155 | } | |
1e05b07c | 1156 | else |
bec14a20 | 1157 | break; |
12c86877 | 1158 | } |
1e05b07c | 1159 | |
1c6d9830 | 1160 | udiff=dt.udiffNoReset(); |
1e05b07c | 1161 | if(securedZone) |
efe7948e | 1162 | g_log<<Logger::Debug<<logPrefix<<"done signing: "<<csp.d_signed/(udiff/1000000.0)<<" sigs/s, "<<endl; |
1e05b07c | 1163 | |
efe7948e | 1164 | DLOG(g_log<<logPrefix<<"done writing out records"<<endl); |
12c86877 | 1165 | /* and terminate with yet again the SOA record */ |
8e9b7d99 | 1166 | outpacket=getFreshAXFRPacket(q); |
9bbcf03a | 1167 | outpacket->addRecord(std::move(soa)); |
60a1c204 | 1168 | if(haveTSIGDetails && !tsigkeyname.empty()) |
1e05b07c FM |
1169 | outpacket->setTSIGDetails(trc, tsigkeyname, tsigsecret, trc.d_mac, true); |
1170 | ||
ff76e8b4 | 1171 | sendPacket(outpacket, outsock); |
1e05b07c | 1172 | |
efe7948e KM |
1173 | DLOG(g_log<<logPrefix<<"last packet - close"<<endl); |
1174 | g_log<<Logger::Notice<<logPrefix<<"AXFR finished"<<endl; | |
12c86877 BH |
1175 | |
1176 | return 1; | |
1177 | } | |
1178 | ||
c2826d2e | 1179 | int TCPNameserver::doIXFR(std::unique_ptr<DNSPacket>& q, int outsock) |
6e59a580 | 1180 | { |
c6ca0aa8 | 1181 | string logPrefix="IXFR-out zone '"+q->qdomain.toLogString()+"', client '"+q->getRemoteStringWithPort()+"', "; |
efe7948e | 1182 | |
c2826d2e | 1183 | std::unique_ptr<DNSPacket> outpacket=getFreshAXFRPacket(q); |
6e59a580 KM |
1184 | if(q->d_dnssecOk) |
1185 | outpacket->d_dnssecOk=true; // RFC 5936, 2.2.5 'SHOULD' | |
1186 | ||
6e59a580 | 1187 | uint32_t serial = 0; |
27c0050c | 1188 | MOADNSParser mdp(false, q->getString()); |
f80ebc05 O |
1189 | for(const auto & answer : mdp.d_answers) { |
1190 | const DNSRecord *rr = &answer.first; | |
e693ff5a | 1191 | if (rr->d_type == QType::SOA && rr->d_place == DNSResourceRecord::AUTHORITY) { |
6e59a580 | 1192 | vector<string>parts; |
d06dcda4 | 1193 | stringtok(parts, rr->getContent()->getZoneRepresentation()); |
6e59a580 | 1194 | if (parts.size() >= 3) { |
95dd3b90 | 1195 | try { |
a0383aad | 1196 | pdns::checked_stoi_into(serial, parts[2]); |
95dd3b90 RG |
1197 | } |
1198 | catch(const std::out_of_range& oor) { | |
efe7948e | 1199 | g_log<<Logger::Warning<<logPrefix<<"invalid serial in IXFR query"<<endl; |
95dd3b90 RG |
1200 | outpacket->setRcode(RCode::FormErr); |
1201 | sendPacket(outpacket,outsock); | |
1202 | return 0; | |
1203 | } | |
6e59a580 | 1204 | } else { |
efe7948e | 1205 | g_log<<Logger::Warning<<logPrefix<<"no serial in IXFR query"<<endl; |
6e59a580 KM |
1206 | outpacket->setRcode(RCode::FormErr); |
1207 | sendPacket(outpacket,outsock); | |
1208 | return 0; | |
1209 | } | |
3e67ea8b | 1210 | } else if (rr->d_type != QType::TSIG && rr->d_type != QType::OPT) { |
d5fcd583 | 1211 | g_log<<Logger::Warning<<logPrefix<<"additional records in IXFR query, type: "<<QType(rr->d_type).toString()<<endl; |
6e59a580 KM |
1212 | outpacket->setRcode(RCode::FormErr); |
1213 | sendPacket(outpacket,outsock); | |
1214 | return 0; | |
1215 | } | |
1216 | } | |
1217 | ||
efe7948e | 1218 | g_log<<Logger::Warning<<logPrefix<<"transfer initiated with serial "<<serial<<endl; |
6e59a580 | 1219 | |
57f95528 | 1220 | // determine if zone exists, XFR is allowed, and if IXFR can proceed using existing backend before spawning a new backend. |
6e59a580 | 1221 | SOAData sd; |
57f95528 CH |
1222 | bool securedZone; |
1223 | bool serialPermitsIXFR; | |
6e59a580 | 1224 | { |
24fb5774 | 1225 | auto packetHandler = s_P.lock(); |
efe7948e | 1226 | DLOG(g_log<<logPrefix<<"Looking for SOA"<<endl); // find domain_id via SOA and list complete domain. No SOA, no IXFR |
24fb5774 | 1227 | if(!*packetHandler) { |
994cae6b | 1228 | g_log<<Logger::Warning<<"TCP server is without backend connections in doIXFR, launching"<<endl; |
24fb5774 | 1229 | *packetHandler = make_unique<PacketHandler>(); |
6e59a580 KM |
1230 | } |
1231 | ||
22893145 | 1232 | // canDoAXFR does all the ACL checks, and has the if(disable-axfr) shortcut, call it first. |
24fb5774 | 1233 | if(!canDoAXFR(q, false, *packetHandler) || !(*packetHandler)->getBackend()->getSOAUncached(q->qdomain, sd)) { |
efe7948e | 1234 | g_log<<Logger::Warning<<logPrefix<<"failed: not authoritative"<<endl; |
9c556f63 | 1235 | outpacket->setRcode(RCode::NotAuth); |
6e59a580 KM |
1236 | sendPacket(outpacket,outsock); |
1237 | return 0; | |
1238 | } | |
22893145 | 1239 | |
24fb5774 | 1240 | DNSSECKeeper dk((*packetHandler)->getBackend()); |
57f95528 | 1241 | DNSSECKeeper::clearCaches(q->qdomain); |
d5e7c918 | 1242 | bool narrow = false; |
57f95528 CH |
1243 | securedZone = dk.isSecuredZone(q->qdomain); |
1244 | if(dk.getNSEC3PARAM(q->qdomain, nullptr, &narrow)) { | |
1245 | if(narrow) { | |
efe7948e | 1246 | g_log<<Logger::Warning<<logPrefix<<"not doing IXFR of an NSEC3 narrow zone"<<endl; |
57f95528 CH |
1247 | outpacket->setRcode(RCode::Refused); |
1248 | sendPacket(outpacket,outsock); | |
1249 | return 0; | |
1250 | } | |
22893145 | 1251 | } |
6e59a580 | 1252 | |
57f95528 | 1253 | serialPermitsIXFR = !rfc1982LessThan(serial, calculateEditSOA(sd.serial, dk, sd.qname)); |
6e59a580 | 1254 | } |
24d9e514 | 1255 | |
57f95528 CH |
1256 | if (serialPermitsIXFR) { |
1257 | DNSName target = q->qdomain; | |
6e59a580 | 1258 | TSIGRecordContent trc; |
7abbc40f PD |
1259 | DNSName tsigkeyname; |
1260 | string tsigsecret; | |
6e59a580 | 1261 | |
57f95528 CH |
1262 | UeberBackend db; |
1263 | DNSSECKeeper dk(&db); | |
57f95528 | 1264 | |
ea3816cf | 1265 | bool haveTSIGDetails = q->getTSIGDetails(&trc, &tsigkeyname); |
6e59a580 | 1266 | |
60a1c204 | 1267 | if(haveTSIGDetails && !tsigkeyname.empty()) { |
bb7fb11c | 1268 | string tsig64; |
3343ad1f | 1269 | DNSName algorithm=trc.d_algoName; // FIXME400: was toLowerCanonic, compare output |
290a083d | 1270 | if (algorithm == DNSName("hmac-md5.sig-alg.reg.int")) |
1271 | algorithm = DNSName("hmac-md5"); | |
40361bf2 KM |
1272 | if (!db.getTSIGKey(tsigkeyname, algorithm, tsig64)) { |
1273 | g_log << Logger::Error << "TSIG key '" << tsigkeyname << "' for domain '" << target << "' not found" << endl; | |
53ace5d5 PL |
1274 | return 0; |
1275 | } | |
1276 | if (B64Decode(tsig64, tsigsecret) == -1) { | |
efe7948e | 1277 | g_log<<Logger::Error<<logPrefix<<"unable to Base-64 decode TSIG key '"<<tsigkeyname<<"'"<<endl; |
53ace5d5 PL |
1278 | return 0; |
1279 | } | |
6e59a580 KM |
1280 | } |
1281 | ||
6e59a580 | 1282 | // SOA *must* go out first, our signing pipe might reorder |
efe7948e | 1283 | DLOG(g_log<<logPrefix<<"sending out SOA"<<endl); |
13f9e280 | 1284 | DNSZoneRecord soa = makeEditedDNSZRFromSOAData(dk, sd); |
9bbcf03a | 1285 | outpacket->addRecord(std::move(soa)); |
ada68bd9 | 1286 | if(securedZone && outpacket->d_dnssecOk) { |
7abbc40f | 1287 | set<DNSName> authSet; |
6e59a580 | 1288 | authSet.insert(target); |
57f95528 | 1289 | addRRSigs(dk, db, authSet, outpacket->getRRS()); |
6e59a580 KM |
1290 | } |
1291 | ||
60a1c204 | 1292 | if(haveTSIGDetails && !tsigkeyname.empty()) |
6e59a580 KM |
1293 | outpacket->setTSIGDetails(trc, tsigkeyname, tsigsecret, trc.d_mac); // first answer is 'normal' |
1294 | ||
1295 | sendPacket(outpacket, outsock); | |
1296 | ||
efe7948e | 1297 | g_log<<Logger::Notice<<logPrefix<<"IXFR finished"<<endl; |
6e59a580 KM |
1298 | |
1299 | return 1; | |
1300 | } | |
1301 | ||
efe7948e | 1302 | g_log<<Logger::Notice<<logPrefix<<"IXFR fallback to AXFR"<<endl; |
6e59a580 KM |
1303 | return doAXFR(q->qdomain, q, outsock); |
1304 | } | |
1305 | ||
12c86877 BH |
1306 | TCPNameserver::~TCPNameserver() |
1307 | { | |
12c86877 BH |
1308 | } |
1309 | ||
1310 | TCPNameserver::TCPNameserver() | |
1311 | { | |
cb0af1a1 RG |
1312 | d_maxTransactionsPerConn = ::arg().asNum("max-tcp-transactions-per-conn"); |
1313 | d_idleTimeout = ::arg().asNum("tcp-idle-timeout"); | |
1314 | d_maxConnectionDuration = ::arg().asNum("max-tcp-connection-duration"); | |
1315 | d_maxConnectionsPerClient = ::arg().asNum("max-tcp-connections-per-client"); | |
1316 | ||
379ab445 | 1317 | // sem_init(&d_connectionroom_sem,0,::arg().asNum("max-tcp-connections")); |
c2826d2e | 1318 | d_connectionroom_sem = make_unique<Semaphore>( ::arg().asNum( "max-tcp-connections" )); |
d322f931 | 1319 | d_maxTCPConnections = ::arg().asNum( "max-tcp-connections" ); |
f5ad09dc | 1320 | |
12c86877 | 1321 | vector<string>locals; |
379ab445 | 1322 | stringtok(locals,::arg()["local-address"]," ,"); |
f5ad09dc PL |
1323 | if(locals.empty()) |
1324 | throw PDNSException("No local addresses specified"); | |
12c86877 | 1325 | |
68b011bd | 1326 | d_ng.toMasks(::arg()["allow-axfr-ips"] ); |
9f1d5826 | 1327 | |
12c86877 | 1328 | signal(SIGPIPE,SIG_IGN); |
12c86877 | 1329 | |
f5ad09dc PL |
1330 | for(auto const &laddr : locals) { |
1331 | ComboAddress local(laddr, ::arg().asNum("local-port")); | |
12c86877 | 1332 | |
f5ad09dc PL |
1333 | int s=socket(local.sin4.sin_family, SOCK_STREAM, 0); |
1334 | if(s<0) | |
1335 | throw PDNSException("Unable to acquire TCP socket: "+stringerror()); | |
3897b9e1 | 1336 | setCloseOnExec(s); |
fb316318 | 1337 | |
12c86877 | 1338 | int tmp=1; |
f5ad09dc | 1339 | if(setsockopt(s, SOL_SOCKET,SO_REUSEADDR, (char*)&tmp, sizeof tmp) < 0) { |
e6a9dde5 | 1340 | g_log<<Logger::Error<<"Setsockopt failed"<<endl; |
f5ad09dc | 1341 | _exit(1); |
12c86877 | 1342 | } |
940d7811 RG |
1343 | |
1344 | if (::arg().asNum("tcp-fast-open") > 0) { | |
1345 | #ifdef TCP_FASTOPEN | |
1346 | int fastOpenQueueSize = ::arg().asNum("tcp-fast-open"); | |
1347 | if (setsockopt(s, IPPROTO_TCP, TCP_FASTOPEN, &fastOpenQueueSize, sizeof fastOpenQueueSize) < 0) { | |
f5ad09dc | 1348 | g_log<<Logger::Error<<"Failed to enable TCP Fast Open for listening socket "<<local.toStringWithPort()<<": "<<stringerror()<<endl; |
940d7811 RG |
1349 | } |
1350 | #else | |
e6a9dde5 | 1351 | g_log<<Logger::Warning<<"TCP Fast Open configured but not supported for listening socket"<<endl; |
940d7811 RG |
1352 | #endif |
1353 | } | |
1354 | ||
f5ad09dc PL |
1355 | if(::arg().mustDo("non-local-bind")) |
1356 | Utility::setBindAny(local.sin4.sin_family, s); | |
1357 | ||
1358 | if(local.isIPv6() && setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, &tmp, sizeof(tmp)) < 0) { | |
1359 | g_log<<Logger::Error<<"Failed to set IPv6 socket to IPv6 only, continuing anyhow: "<<stringerror()<<endl; | |
1360 | } | |
fec7dd5a | 1361 | |
379ab445 | 1362 | if(::bind(s, (sockaddr*)&local, local.getSocklen())<0) { |
a702a96c | 1363 | int err = errno; |
2c896042 | 1364 | close(s); |
a702a96c | 1365 | if( err == EADDRNOTAVAIL && ! ::arg().mustDo("local-address-nonexist-fail") ) { |
f5ad09dc | 1366 | g_log<<Logger::Error<<"Address " << local.toString() << " does not exist on this server - skipping TCP bind" << endl; |
5ecb2885 MZ |
1367 | continue; |
1368 | } else { | |
f5ad09dc | 1369 | g_log<<Logger::Error<<"Unable to bind to TCP socket " << local.toStringWithPort() << ": "<<stringerror(err)<<endl; |
2ab7e9ac | 1370 | throw PDNSException("Unable to bind to TCP socket"); |
5ecb2885 | 1371 | } |
12c86877 | 1372 | } |
12c86877 | 1373 | |
f5ad09dc PL |
1374 | listen(s, 128); |
1375 | g_log<<Logger::Error<<"TCP server bound to "<<local.toStringWithPort()<<endl; | |
12c86877 | 1376 | d_sockets.push_back(s); |
8edfedf1 BH |
1377 | struct pollfd pfd; |
1378 | memset(&pfd, 0, sizeof(pfd)); | |
1379 | pfd.fd = s; | |
1380 | pfd.events = POLLIN; | |
8edfedf1 | 1381 | d_prfds.push_back(pfd); |
12c86877 | 1382 | } |
12c86877 BH |
1383 | } |
1384 | ||
1385 | ||
ff76e8b4 | 1386 | //! Start of TCP operations thread, we launch a new thread for each incoming TCP question |
12c86877 BH |
1387 | void TCPNameserver::thread() |
1388 | { | |
519f5484 | 1389 | setThreadName("pdns/tcpnameser"); |
12c86877 BH |
1390 | try { |
1391 | for(;;) { | |
1392 | int fd; | |
cb0af1a1 RG |
1393 | ComboAddress remote; |
1394 | Utility::socklen_t addrlen=remote.getSocklen(); | |
12c86877 | 1395 | |
8edfedf1 | 1396 | int ret=poll(&d_prfds[0], d_prfds.size(), -1); // blocks, forever if need be |
8a63d3ce | 1397 | if(ret <= 0) |
4957a608 | 1398 | continue; |
8a63d3ce | 1399 | |
12c86877 | 1400 | int sock=-1; |
8ce9e4e6 | 1401 | for(const pollfd& pfd : d_prfds) { |
c1ee10a6 | 1402 | if(pfd.revents & POLLIN) { |
4957a608 | 1403 | sock = pfd.fd; |
cb0af1a1 RG |
1404 | remote.sin4.sin_family = AF_INET6; |
1405 | addrlen=remote.getSocklen(); | |
4957a608 BH |
1406 | |
1407 | if((fd=accept(sock, (sockaddr*)&remote, &addrlen))<0) { | |
a702a96c OM |
1408 | int err = errno; |
1409 | g_log<<Logger::Error<<"TCP question accept error: "<<stringerror(err)<<endl; | |
1e05b07c | 1410 | |
a702a96c | 1411 | if(err==EMFILE) { |
e6a9dde5 | 1412 | g_log<<Logger::Error<<"TCP handler out of filedescriptors, exiting, won't recover from this"<<endl; |
5bd2ea7b | 1413 | _exit(1); |
4957a608 BH |
1414 | } |
1415 | } | |
1416 | else { | |
cb0af1a1 | 1417 | if (d_maxConnectionsPerClient) { |
24fb5774 RG |
1418 | auto clientsCount = s_clientsCount.lock(); |
1419 | if ((*clientsCount)[remote] >= d_maxConnectionsPerClient) { | |
e6a9dde5 | 1420 | g_log<<Logger::Notice<<"Limit of simultaneous TCP connections per client reached for "<< remote<<", dropping"<<endl; |
cb0af1a1 RG |
1421 | close(fd); |
1422 | continue; | |
1423 | } | |
24fb5774 | 1424 | (*clientsCount)[remote]++; |
cb0af1a1 RG |
1425 | } |
1426 | ||
4957a608 BH |
1427 | d_connectionroom_sem->wait(); // blocks if no connections are available |
1428 | ||
1429 | int room; | |
1430 | d_connectionroom_sem->getValue( &room); | |
1431 | if(room<1) | |
e6a9dde5 | 1432 | g_log<<Logger::Warning<<"Limit of simultaneous TCP connections reached - raise max-tcp-connections"<<endl; |
4957a608 | 1433 | |
0ddde5fb RG |
1434 | try { |
1435 | std::thread connThread(doConnection, fd); | |
1436 | connThread.detach(); | |
1437 | } | |
1438 | catch (std::exception& e) { | |
1439 | g_log<<Logger::Error<<"Error creating thread: "<<e.what()<<endl; | |
4957a608 | 1440 | d_connectionroom_sem->post(); |
48e8d70b | 1441 | close(fd); |
cb0af1a1 | 1442 | decrementClientCount(remote); |
4957a608 BH |
1443 | } |
1444 | } | |
1445 | } | |
12c86877 BH |
1446 | } |
1447 | } | |
1448 | } | |
3f81d239 | 1449 | catch(PDNSException &AE) { |
e6a9dde5 | 1450 | g_log<<Logger::Error<<"TCP Nameserver thread dying because of fatal error: "<<AE.reason<<endl; |
12c86877 BH |
1451 | } |
1452 | catch(...) { | |
e6a9dde5 | 1453 | g_log<<Logger::Error<<"TCPNameserver dying because of an unexpected fatal error"<<endl; |
12c86877 | 1454 | } |
5bd2ea7b | 1455 | _exit(1); // take rest of server with us |
12c86877 BH |
1456 | } |
1457 | ||
1458 | ||
d322f931 PD |
1459 | unsigned int TCPNameserver::numTCPConnections() |
1460 | { | |
1461 | int room; | |
1462 | d_connectionroom_sem->getValue( &room); | |
1463 | return d_maxTCPConnections - room; | |
1464 | } |