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/*
* This file is part of PowerDNS or dnsdist.
* Copyright -- PowerDNS.COM B.V. and its contributors
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* In addition, for the avoidance of any doubt, permission is granted to
* link this program with OpenSSL and to (re)distribute the binaries
* produced as the result of such linking.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#pragma once
#include "dnsrecords.hh"
#include <string>
#include <vector>
#include <map>
#include "misc.hh"
class UeberBackend;
// rules of the road: Algorithm must be set in 'make' for each KeyEngine, and will NEVER change!
class DNSCryptoKeyEngine
{
public:
explicit DNSCryptoKeyEngine(unsigned int algorithm) : d_algorithm(algorithm) {}
virtual ~DNSCryptoKeyEngine() {};
virtual string getName() const = 0;
typedef std::map<std::string, std::string> stormap_t;
typedef std::vector<std::pair<std::string, std::string > > storvector_t;
virtual void create(unsigned int bits)=0;
virtual void createFromPEMFile(DNSKEYRecordContent& drc, const std::string& filename, std::FILE& fp)
{
throw std::runtime_error("Can't create key from PEM file");
}
virtual storvector_t convertToISCVector() const =0;
std::string convertToISC() const ;
virtual void convertToPEM(std::FILE& fp) const
{
throw std::runtime_error(getName() + ": Conversion to PEM not supported");
};
virtual std::string sign(const std::string& msg) const =0;
virtual std::string hash(const std::string& msg) const
{
throw std::runtime_error("hash() function not implemented");
return msg;
}
virtual bool verify(const std::string& msg, const std::string& signature) const =0;
virtual std::string getPubKeyHash()const =0;
virtual std::string getPublicKeyString()const =0;
virtual int getBits() const =0;
virtual unsigned int getAlgorithm() const
{
return d_algorithm;
}
virtual void fromISCMap(DNSKEYRecordContent& drc, stormap_t& stormap) = 0;
virtual void fromPublicKeyString(const std::string& content) = 0;
virtual bool checkKey(vector<string>* errorMessages = nullptr) const
{
return true;
}
static std::unique_ptr<DNSCryptoKeyEngine> makeFromISCFile(DNSKEYRecordContent& drc, const char* fname);
/**
* \brief Creates a key engine from a PEM file.
*
* Receives an open file handle with PEM contents and creates a key
* engine corresponding to the algorithm requested.
*
* \param[in] drc Key record contents to be populated.
*
* \param[in] filename Only used for providing filename information
* in error messages.
*
* \param[in] fp An open file handle to a file containing PEM
* contents.
*
* \param[in] algorithm Which algorithm to use. See
* https://www.iana.org/assignments/dns-sec-alg-numbers/dns-sec-alg-numbers.xhtml
*
* \return A key engine corresponding to the requested algorithm and
* populated with the contents of the PEM file.
*/
static std::unique_ptr<DNSCryptoKeyEngine> makeFromPEMFile(DNSKEYRecordContent& drc, const std::string& filename, std::FILE& fp, uint8_t algorithm);
static std::unique_ptr<DNSCryptoKeyEngine> makeFromISCString(DNSKEYRecordContent& drc, const std::string& content);
static std::unique_ptr<DNSCryptoKeyEngine> makeFromPublicKeyString(unsigned int algorithm, const std::string& raw);
static std::unique_ptr<DNSCryptoKeyEngine> make(unsigned int algorithm);
static bool isAlgorithmSupported(unsigned int algo);
static bool isDigestSupported(uint8_t digest);
typedef std::unique_ptr<DNSCryptoKeyEngine> maker_t(unsigned int algorithm);
static void report(unsigned int algorithm, maker_t* maker, bool fallback=false);
static void testMakers(unsigned int algorithm, maker_t* creator, maker_t* signer, maker_t* verifier);
static vector<pair<uint8_t, string>> listAllAlgosWithBackend();
static bool testAll();
static bool testOne(int algo);
private:
typedef std::map<unsigned int, maker_t*> makers_t;
typedef std::map<unsigned int, vector<maker_t*> > allmakers_t;
static makers_t& getMakers()
{
static makers_t s_makers;
return s_makers;
}
static allmakers_t& getAllMakers()
{
static allmakers_t s_allmakers;
return s_allmakers;
}
protected:
const unsigned int d_algorithm;
};
struct DNSSECPrivateKey
{
uint16_t getTag() const
{
return getDNSKEY().getTag();
}
const std::shared_ptr<DNSCryptoKeyEngine>& getKey() const
{
return d_key;
}
void setKey(std::shared_ptr<DNSCryptoKeyEngine>& key)
{
d_key = key;
d_algorithm = d_key->getAlgorithm();
}
void setKey(std::unique_ptr<DNSCryptoKeyEngine>&& key)
{
d_key = std::move(key);
d_algorithm = d_key->getAlgorithm();
}
DNSKEYRecordContent getDNSKEY() const;
uint16_t d_flags;
uint8_t d_algorithm;
private:
std::shared_ptr<DNSCryptoKeyEngine> d_key;
};
struct CanonicalCompare
{
bool operator()(const std::string& a, const std::string& b) {
std::vector<std::string> avect, bvect;
stringtok(avect, a, ".");
stringtok(bvect, b, ".");
reverse(avect.begin(), avect.end());
reverse(bvect.begin(), bvect.end());
return avect < bvect;
}
};
struct sharedDNSSECRecordCompare {
bool operator() (const shared_ptr<DNSRecordContent>& a, const shared_ptr<DNSRecordContent>& b) const {
return a->serialize(g_rootdnsname, true, true) < b->serialize(g_rootdnsname, true, true);
}
};
typedef std::set<std::shared_ptr<DNSRecordContent>, sharedDNSSECRecordCompare> sortedRecords_t;
string getMessageForRRSET(const DNSName& qname, const RRSIGRecordContent& rrc, const sortedRecords_t& signRecords, bool processRRSIGLabels = false, bool includeRRSIG_RDATA = true);
DSRecordContent makeDSFromDNSKey(const DNSName& qname, const DNSKEYRecordContent& drc, uint8_t digest);
class DNSSECKeeper;
uint32_t getStartOfWeek();
string hashQNameWithSalt(const NSEC3PARAMRecordContent& ns3prc, const DNSName& qname);
string hashQNameWithSalt(const std::string& salt, unsigned int iterations, const DNSName& qname);
void incrementHash(std::string& raw);
void decrementHash(std::string& raw);
void addRRSigs(DNSSECKeeper& dk, UeberBackend& db, const std::set<DNSName>& authMap, vector<DNSZoneRecord>& rrs);
void addTSIG(DNSPacketWriter& pw, TSIGRecordContent& trc, const DNSName& tsigkeyname, const string& tsigsecret, const string& tsigprevious, bool timersonly);
bool validateTSIG(const std::string& packet, size_t sigPos, const TSIGTriplet& tt, const TSIGRecordContent& trc, const std::string& previousMAC, const std::string& theirMAC, bool timersOnly, unsigned int dnsHeaderOffset=0);
uint64_t signatureCacheSize(const std::string& str);
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