pdns/validate.hh

   1 /*
   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  */
  22 #pragma once
  23
  24 #include "dnsparser.hh"
  25 #include "dnsname.hh"
  26 #include <vector>
  27 #include "namespaces.hh"
  28 #include "dnsrecords.hh"
  29
  30 extern bool g_dnssecLOG;
  31 extern time_t g_signatureInceptionSkew;
  32 extern uint16_t g_maxNSEC3Iterations;
  33
  34 // 4033 5
  35 enum vState { Indeterminate, Bogus, Insecure, Secure, NTA, TA };
  36 extern const char *vStates[];
  37
  38 // NSEC(3) results
  39 enum dState { NODATA, NXDOMAIN, NXQTYPE, ENT, INSECURE, OPTOUT};
  40 extern const char *dStates[];
  41
  42 class DNSRecordOracle
  43 {
  44 public:
  45   virtual std::vector<DNSRecord> get(const DNSName& qname, uint16_t qtype)=0;
  46 };
  47
  48
  49 struct ContentSigPair
  50 {
  51   vector<shared_ptr<DNSRecordContent>> records;
  52   vector<shared_ptr<RRSIGRecordContent>> signatures;
  53   // ponder adding a validate method that accepts a key
  54 };
  55 typedef map<pair<DNSName,uint16_t>, ContentSigPair> cspmap_t;
  56 typedef std::set<DSRecordContent> dsmap_t;
  57
  58 struct sharedDNSKeyRecordContentCompare
  59 {
  60   bool operator() (const shared_ptr<DNSKEYRecordContent>& a, const shared_ptr<DNSKEYRecordContent>& b) const
  61   {
  62     return *a < *b;
  63   }
  64 };
  65
  66 typedef set<shared_ptr<DNSKEYRecordContent>, sharedDNSKeyRecordContentCompare > skeyset_t;
  67
  68 bool validateWithKeySet(time_t now, const DNSName& name, const vector<shared_ptr<DNSRecordContent> >& records, const vector<shared_ptr<RRSIGRecordContent> >& signatures, const skeyset_t& keys, bool validateAllSigs=true);
  69 void validateWithKeySet(const cspmap_t& rrsets, cspmap_t& validated, const skeyset_t& keys);
  70 cspmap_t harvestCSPFromRecs(const vector<DNSRecord>& recs);
  71 vState getKeysFor(DNSRecordOracle& dro, const DNSName& zone, skeyset_t& keyset);
  72 bool getTrustAnchor(const map<DNSName,dsmap_t>& anchors, const DNSName& zone, dsmap_t &res);
  73 bool haveNegativeTrustAnchor(const map<DNSName,std::string>& negAnchors, const DNSName& zone, std::string& reason);
  74 void validateDNSKeysAgainstDS(time_t now, const DNSName& zone, const dsmap_t& dsmap, const skeyset_t& tkeys, vector<shared_ptr<DNSRecordContent> >& toSign, const vector<shared_ptr<RRSIGRecordContent> >& sigs, skeyset_t& validkeys);
  75 dState getDenial(const cspmap_t &validrrsets, const DNSName& qname, const uint16_t qtype, bool referralToUnsigned, bool wantsNoDataProof, bool needsWildcardProof=true, unsigned int wildcardLabelsCount=0);
  76 bool isSupportedDS(const DSRecordContent& ds);
  77 DNSName getSigner(const std::vector<std::shared_ptr<RRSIGRecordContent> >& signatures);
  78 bool denialProvesNoDelegation(const DNSName& zone, const std::vector<DNSRecord>& dsrecords);
  79 bool isRRSIGNotExpired(const time_t now, const shared_ptr<RRSIGRecordContent> sig);
  80 bool isWildcardExpanded(unsigned int labelCount, const std::shared_ptr<RRSIGRecordContent>& sign);
  81 bool isWildcardExpandedOntoItself(const DNSName& owner, unsigned int labelCount, const std::shared_ptr<RRSIGRecordContent>& sign);