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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.
*/
#include "config.h"
#include "dnsdist.hh"
#include "dnsdist-lua.hh"
#include "dolog.hh"
void setupLuaBindingsDNSCrypt(LuaContext& luaCtx, bool client)
{
#ifdef HAVE_DNSCRYPT
/* DNSCryptContext bindings */
luaCtx.registerFunction<std::string(DNSCryptContext::*)()const>("getProviderName", [](const DNSCryptContext& ctx) { return ctx.getProviderName().toStringNoDot(); });
luaCtx.registerFunction("markActive", &DNSCryptContext::markActive);
luaCtx.registerFunction("markInactive", &DNSCryptContext::markInactive);
luaCtx.registerFunction("reloadCertificates", &DNSCryptContext::reloadCertificates);
luaCtx.registerFunction("removeInactiveCertificate", &DNSCryptContext::removeInactiveCertificate);
luaCtx.registerFunction<void(std::shared_ptr<DNSCryptContext>::*)(const std::string& certFile, const std::string& keyFile, boost::optional<bool> active)>("loadNewCertificate", [](std::shared_ptr<DNSCryptContext> ctx, const std::string& certFile, const std::string& keyFile, boost::optional<bool> active) {
if (ctx == nullptr) {
throw std::runtime_error("DNSCryptContext::loadNewCertificate() called on a nil value");
}
ctx->loadNewCertificate(certFile, keyFile, active ? *active : true);
});
luaCtx.registerFunction<void(std::shared_ptr<DNSCryptContext>::*)(const DNSCryptCert& newCert, const DNSCryptPrivateKey& newKey, boost::optional<bool> active)>("addNewCertificate", [](std::shared_ptr<DNSCryptContext> ctx, const DNSCryptCert& newCert, const DNSCryptPrivateKey& newKey, boost::optional<bool> active) {
if (ctx == nullptr) {
throw std::runtime_error("DNSCryptContext::addNewCertificate() called on a nil value");
}
ctx->addNewCertificate(newCert, newKey, active ? *active : true);
});
luaCtx.registerFunction<LuaArray<std::shared_ptr<DNSCryptCertificatePair>>(std::shared_ptr<DNSCryptContext>::*)()>("getCertificatePairs", [](std::shared_ptr<DNSCryptContext> ctx) {
LuaArray<std::shared_ptr<DNSCryptCertificatePair>> result;
if (ctx != nullptr) {
size_t idx = 1;
for (const auto& pair : ctx->getCertificates()) {
result.push_back({idx++, pair});
}
}
return result;
});
luaCtx.registerFunction<std::shared_ptr<DNSCryptCertificatePair>(std::shared_ptr<DNSCryptContext>::*)(size_t idx)>("getCertificatePair", [](std::shared_ptr<DNSCryptContext> ctx, size_t idx) {
if (ctx == nullptr) {
throw std::runtime_error("DNSCryptContext::getCertificatePair() called on a nil value");
}
std::shared_ptr<DNSCryptCertificatePair> result = nullptr;
auto pairs = ctx->getCertificates();
if (idx < pairs.size()) {
result = pairs.at(idx);
}
return result;
});
luaCtx.registerFunction<const DNSCryptCert(std::shared_ptr<DNSCryptContext>::*)(size_t idx)>("getCertificate", [](std::shared_ptr<DNSCryptContext> ctx, size_t idx) {
if (ctx == nullptr) {
throw std::runtime_error("DNSCryptContext::getCertificate() called on a nil value");
}
auto pairs = ctx->getCertificates();
if (idx < pairs.size()) {
return pairs.at(idx)->cert;
}
throw std::runtime_error("This DNSCrypt context has no certificate at index " + std::to_string(idx));
});
luaCtx.registerFunction<std::string(std::shared_ptr<DNSCryptContext>::*)()const>("printCertificates", [](const std::shared_ptr<DNSCryptContext> ctx) {
ostringstream ret;
if (ctx != nullptr) {
size_t idx = 1;
boost::format fmt("%1$-3d %|5t|%2$-8d %|10t|%3$-7d %|20t|%4$-21.21s %|41t|%5$-21.21s");
ret << (fmt % "#" % "Serial" % "Version" % "From" % "To" ) << endl;
for (const auto& pair : ctx->getCertificates()) {
const auto& cert = pair->cert;
const DNSCryptExchangeVersion version = DNSCryptContext::getExchangeVersion(cert);
ret << (fmt % idx % cert.getSerial() % (version == DNSCryptExchangeVersion::VERSION1 ? 1 : 2) % DNSCryptContext::certificateDateToStr(cert.getTSStart()) % DNSCryptContext::certificateDateToStr(cert.getTSEnd())) << endl;
}
}
return ret.str();
});
luaCtx.registerFunction<void(DNSCryptContext::*)(const std::string& providerPrivateKeyFile, uint32_t serial, time_t begin, time_t end, boost::optional<DNSCryptExchangeVersion> version)>("generateAndLoadInMemoryCertificate", [](DNSCryptContext& ctx, const std::string& providerPrivateKeyFile, uint32_t serial, time_t begin, time_t end, boost::optional<DNSCryptExchangeVersion> version) {
DNSCryptPrivateKey privateKey;
DNSCryptCert cert;
try {
if (generateDNSCryptCertificate(providerPrivateKeyFile, serial, begin, end, version ? *version : DNSCryptExchangeVersion::VERSION1, cert, privateKey)) {
ctx.addNewCertificate(cert, privateKey);
}
}
catch (const std::exception& e) {
errlog("Error generating a DNSCrypt certificate: %s", e.what());
g_outputBuffer = "Error generating a DNSCrypt certificate: " + string(e.what()) + "\n";
}
});
/* DNSCryptCertificatePair */
luaCtx.registerFunction<const DNSCryptCert(std::shared_ptr<DNSCryptCertificatePair>::*)()const>("getCertificate", [](const std::shared_ptr<DNSCryptCertificatePair> pair) {
if (pair == nullptr) {
throw std::runtime_error("DNSCryptCertificatePair::getCertificate() called on a nil value");
}
return pair->cert;
});
luaCtx.registerFunction<bool(std::shared_ptr<DNSCryptCertificatePair>::*)()const>("isActive", [](const std::shared_ptr<DNSCryptCertificatePair> pair) {
if (pair == nullptr) {
throw std::runtime_error("DNSCryptCertificatePair::isActive() called on a nil value");
}
return pair->active;
});
/* DNSCryptCert */
luaCtx.registerFunction<std::string(DNSCryptCert::*)()const>("getMagic", [](const DNSCryptCert& cert) { return std::string(reinterpret_cast<const char*>(cert.magic), sizeof(cert.magic)); });
luaCtx.registerFunction<std::string(DNSCryptCert::*)()const>("getEsVersion", [](const DNSCryptCert& cert) { return std::string(reinterpret_cast<const char*>(cert.esVersion), sizeof(cert.esVersion)); });
luaCtx.registerFunction<std::string(DNSCryptCert::*)()const>("getProtocolMinorVersion", [](const DNSCryptCert& cert) { return std::string(reinterpret_cast<const char*>(cert.protocolMinorVersion), sizeof(cert.protocolMinorVersion)); });
luaCtx.registerFunction<std::string(DNSCryptCert::*)()const>("getSignature", [](const DNSCryptCert& cert) { return std::string(reinterpret_cast<const char*>(cert.signature), sizeof(cert.signature)); });
luaCtx.registerFunction<std::string(DNSCryptCert::*)()const>("getResolverPublicKey", [](const DNSCryptCert& cert) { return std::string(reinterpret_cast<const char*>(cert.signedData.resolverPK), sizeof(cert.signedData.resolverPK)); });
luaCtx.registerFunction<std::string(DNSCryptCert::*)()const>("getClientMagic", [](const DNSCryptCert& cert) { return std::string(reinterpret_cast<const char*>(cert.signedData.clientMagic), sizeof(cert.signedData.clientMagic)); });
luaCtx.registerFunction<uint32_t(DNSCryptCert::*)()const>("getSerial", [](const DNSCryptCert& cert) { return cert.getSerial(); });
luaCtx.registerFunction<uint32_t(DNSCryptCert::*)()const>("getTSStart", [](const DNSCryptCert& cert) { return ntohl(cert.getTSStart()); });
luaCtx.registerFunction<uint32_t(DNSCryptCert::*)()const>("getTSEnd", [](const DNSCryptCert& cert) { return ntohl(cert.getTSEnd()); });
luaCtx.writeFunction("generateDNSCryptCertificate", [client](const std::string& providerPrivateKeyFile, const std::string& certificateFile, const std::string& privateKeyFile, uint32_t serial, time_t begin, time_t end, boost::optional<DNSCryptExchangeVersion> version) {
setLuaNoSideEffect();
if (client) {
return;
}
DNSCryptPrivateKey privateKey;
DNSCryptCert cert;
try {
if (generateDNSCryptCertificate(providerPrivateKeyFile, serial, begin, end, version ? *version : DNSCryptExchangeVersion::VERSION1, cert, privateKey)) {
privateKey.saveToFile(privateKeyFile);
DNSCryptContext::saveCertFromFile(cert, certificateFile);
}
}
catch (const std::exception& e) {
errlog("Error generating a DNSCrypt certificate: %s", e.what());
g_outputBuffer = "Error generating a DNSCrypt certificate: " + string(e.what()) + "\n";
}
});
luaCtx.writeFunction("generateDNSCryptProviderKeys", [client](const std::string& publicKeyFile, const std::string& privateKeyFile) {
setLuaNoSideEffect();
if (client) {
return;
}
unsigned char publicKey[DNSCRYPT_PROVIDER_PUBLIC_KEY_SIZE];
unsigned char privateKey[DNSCRYPT_PROVIDER_PRIVATE_KEY_SIZE];
sodium_mlock(privateKey, sizeof(privateKey));
try {
DNSCryptContext::generateProviderKeys(publicKey, privateKey);
ofstream pubKStream(publicKeyFile);
pubKStream.write(reinterpret_cast<char*>(publicKey), sizeof(publicKey));
pubKStream.close();
ofstream privKStream(privateKeyFile);
privKStream.write(reinterpret_cast<char*>(privateKey), sizeof(privateKey));
privKStream.close();
g_outputBuffer = "Provider fingerprint is: " + DNSCryptContext::getProviderFingerprint(publicKey) + "\n";
}
catch (const std::exception& e) {
errlog("Error generating a DNSCrypt provider key: %s", e.what());
g_outputBuffer = "Error generating a DNSCrypt provider key: " + string(e.what()) + "\n";
}
sodium_memzero(privateKey, sizeof(privateKey));
sodium_munlock(privateKey, sizeof(privateKey));
});
luaCtx.writeFunction("printDNSCryptProviderFingerprint", [](const std::string& publicKeyFile) {
setLuaNoSideEffect();
unsigned char publicKey[DNSCRYPT_PROVIDER_PUBLIC_KEY_SIZE];
try {
ifstream file(publicKeyFile);
file.read(reinterpret_cast<char*>(&publicKey), sizeof(publicKey));
if (file.fail()) {
throw std::runtime_error("Invalid dnscrypt provider public key file " + publicKeyFile);
}
file.close();
g_outputBuffer = "Provider fingerprint is: " + DNSCryptContext::getProviderFingerprint(publicKey) + "\n";
}
catch (const std::exception& e) {
errlog("Error getting a DNSCrypt provider fingerprint: %s", e.what());
g_outputBuffer = "Error getting a DNSCrypt provider fingerprint: " + string(e.what()) + "\n";
}
});
#endif
}
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