I2P: End-to-End encrypted and anonymous Internet https://i2pd.website/
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#include <string.h>
#include <fstream>
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#include <sstream>
#include <boost/regex.hpp>
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#include <boost/filesystem.hpp>
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#include <cryptopp/osrng.h>
#include <cryptopp/asn.h>
#include <cryptopp/base64.h>
#include <cryptopp/crc.h>
#include <cryptopp/zinflate.h>
#include "I2PEndian.h"
#include "Reseed.h"
#include "Log.h"
#include "Identity.h"
#include "CryptoConst.h"
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#include "NetDb.h"
#include "util.h"
namespace i2p
{
namespace data
{
static std::vector<std::string> httpReseedHostList = {
// "http://193.150.121.66/netDb/", // unstable
// "http://us.reseed.i2p2.no/", // misconfigured, not serving reseed data
// "http://jp.reseed.i2p2.no/", // Really outdated RIs
"http://netdb.i2p2.no/", // only SU3 (v2) support
"http://i2p.mooo.com/netDb/",
"http://uk.reseed.i2p2.no/",
"http://i2p-netdb.innovatio.no/"
};
//TODO: Remember to add custom port support. Not all serves on 443
static std::vector<std::string> httpsReseedHostList = {
// "https://193.150.121.66/netDb/", // unstable
// "https://i2p-netdb.innovatio.no/",// Vuln to POODLE
"https://netdb.i2p2.no/", // Only SU3 (v2) support
"https://reseed.i2p-projekt.de/", // Only HTTPS
"https://cowpuncher.drollette.com/netdb/", // Only HTTPS and SU3 (v2) support -- will move to a new location
"https://i2p.mooo.com/netDb/",
"https://link.mx24.eu/", // Only HTTPS and SU3 (v2) support
"https://i2pseed.zarrenspry.info/", // Only HTTPS and SU3 (v2) support
"https://ieb9oopo.mooo.com/", // Only HTTPS and SU3 (v2) support
"https://ssl.webpack.de/ivae2he9.sg4.e-plaza.de/" // Only HTTPS and SU3 (v2) support
};
//TODO: Implement v2 reseeding. Lightweight zip library is needed.
//TODO: Implement SU3, utils.
Reseeder::Reseeder()
{
}
Reseeder::~Reseeder()
{
}
bool Reseeder::reseedNow()
{
try
{
// Seems like the best place to try to intercept with SSL
/*ssl_server = true;
try {
// SSL
}
catch (std::exception& e)
{
LogPrint("Exception in SSL: ", e.what());
}*/
std::string reseedHost = httpReseedHostList[(rand() % httpReseedHostList.size())];
LogPrint("Reseeding from ", reseedHost);
std::string content = i2p::util::http::httpRequest(reseedHost);
if (content == "")
{
LogPrint("Reseed failed");
return false;
}
boost::regex e("<\\s*A\\s+[^>]*href\\s*=\\s*\"([^\"]*)\"", boost::regex::normal | boost::regbase::icase);
boost::sregex_token_iterator i(content.begin(), content.end(), e, 1);
boost::sregex_token_iterator j;
//TODO: Ugly code, try to clean up.
//TODO: Try to reduce N number of variables
std::string name;
std::string routerInfo;
std::string tmpUrl;
std::string filename;
std::string ignoreFileSuffix = ".su3";
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boost::filesystem::path root = i2p::util::filesystem::GetDataDir();
while (i != j)
{
name = *i++;
if (name.find(ignoreFileSuffix)!=std::string::npos)
continue;
LogPrint("Downloading ", name);
tmpUrl = reseedHost;
tmpUrl.append(name);
routerInfo = i2p::util::http::httpRequest(tmpUrl);
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if (routerInfo.size()==0)
continue;
filename = root.string();
#ifndef _WIN32
filename += "/netDb/r";
#else
filename += "\\netDb\\r";
#endif
filename += name.at(11); // first char in id
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#ifndef _WIN32
filename.append("/");
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#else
filename.append("\\");
#endif
filename.append(name.c_str());
std::ofstream outfile (filename, std::ios::binary);
outfile << routerInfo;
outfile.close();
}
return true;
}
catch (std::exception& ex)
{
//TODO: error reporting
return false;
}
return false;
}
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int Reseeder::ReseedNowSU3 ()
{
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CryptoPP::AutoSeededRandomPool rnd;
auto ind = rnd.GenerateWord32 (0, httpReseedHostList.size() - 1);
std::string reseedHost = httpReseedHostList[ind];
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return ReseedFromSU3 (reseedHost);
}
int Reseeder::ReseedFromSU3 (const std::string& host)
{
std::string url = host + "i2pseeds.su3";
LogPrint (eLogInfo, "Dowloading SU3 from ", host);
std::string su3 = i2p::util::http::httpRequest (url);
if (su3.length () > 0)
{
std::stringstream s(su3);
return ProcessSU3Stream (s);
}
else
{
LogPrint (eLogWarning, "SU3 download failed");
return 0;
}
}
int Reseeder::ProcessSU3File (const char * filename)
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{
std::ifstream s(filename, std::ifstream::binary);
if (s.is_open ())
return ProcessSU3Stream (s);
else
{
LogPrint (eLogError, "Can't open file ", filename);
return 0;
}
}
const char SU3_MAGIC_NUMBER[]="I2Psu3";
const uint32_t ZIP_HEADER_SIGNATURE = 0x04034B50;
const uint32_t ZIP_CENTRAL_DIRECTORY_HEADER_SIGNATURE = 0x02014B50;
const uint16_t ZIP_BIT_FLAG_DATA_DESCRIPTOR = 0x0008;
int Reseeder::ProcessSU3Stream (std::istream& s)
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{
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char magicNumber[7];
s.read (magicNumber, 7); // magic number and zero byte 6
if (strcmp (magicNumber, SU3_MAGIC_NUMBER))
{
LogPrint (eLogError, "Unexpected SU3 magic number");
return 0;
}
s.seekg (1, std::ios::cur); // su3 file format version
SigningKeyType signatureType;
s.read ((char *)&signatureType, 2); // signature type
signatureType = be16toh (signatureType);
uint16_t signatureLength;
s.read ((char *)&signatureLength, 2); // signature length
signatureLength = be16toh (signatureLength);
s.seekg (1, std::ios::cur); // unused
uint8_t versionLength;
s.read ((char *)&versionLength, 1); // version length
s.seekg (1, std::ios::cur); // unused
uint8_t signerIDLength;
s.read ((char *)&signerIDLength, 1); // signer ID length
uint64_t contentLength;
s.read ((char *)&contentLength, 8); // content length
contentLength = be64toh (contentLength);
s.seekg (1, std::ios::cur); // unused
uint8_t fileType;
s.read ((char *)&fileType, 1); // file type
if (fileType != 0x00) // zip file
{
LogPrint (eLogError, "Can't handle file type ", (int)fileType);
return 0;
}
s.seekg (1, std::ios::cur); // unused
uint8_t contentType;
s.read ((char *)&contentType, 1); // content type
if (contentType != 0x03) // reseed data
{
LogPrint (eLogError, "Unexpected content type ", (int)contentType);
return 0;
}
s.seekg (12, std::ios::cur); // unused
s.seekg (versionLength, std::ios::cur); // skip version
char signerID[256];
s.read (signerID, signerIDLength); // signerID
signerID[signerIDLength] = 0;
//try to verify signature
auto it = m_SigningKeys.find (signerID);
if (it != m_SigningKeys.end ())
{
// TODO: implement all signature types
if (signatureType == SIGNING_KEY_TYPE_RSA_SHA512_4096)
{
size_t pos = s.tellg ();
size_t tbsLen = pos + contentLength;
uint8_t * tbs = new uint8_t[tbsLen];
s.seekg (0, std::ios::beg);
s.read ((char *)tbs, tbsLen);
uint8_t * signature = new uint8_t[signatureLength];
s.read ((char *)signature, signatureLength);
// RSA-raw
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i2p::crypto::RSASHA5124096RawVerifier verifier(it->second);
verifier.Update (tbs, tbsLen);
if (!verifier.Verify (signature))
LogPrint (eLogWarning, "SU3 signature verification failed");
delete[] signature;
delete[] tbs;
s.seekg (pos, std::ios::beg);
}
else
LogPrint (eLogWarning, "Signature type ", signatureType, " is not supported");
}
else
LogPrint (eLogWarning, "Certificate for ", signerID, " not loaded");
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// handle content
int numFiles = 0;
size_t contentPos = s.tellg ();
while (!s.eof ())
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{
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uint32_t signature;
s.read ((char *)&signature, 4);
signature = le32toh (signature);
if (signature == ZIP_HEADER_SIGNATURE)
{
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// next local file
s.seekg (2, std::ios::cur); // version
uint16_t bitFlag;
s.read ((char *)&bitFlag, 2);
bitFlag = le16toh (bitFlag);
uint16_t compressionMethod;
s.read ((char *)&compressionMethod, 2);
compressionMethod = le16toh (compressionMethod);
s.seekg (4, std::ios::cur); // skip fields we don't care about
uint32_t compressedSize, uncompressedSize;
uint8_t crc32[4];
s.read ((char *)crc32, 4);
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s.read ((char *)&compressedSize, 4);
compressedSize = le32toh (compressedSize);
s.read ((char *)&uncompressedSize, 4);
uncompressedSize = le32toh (uncompressedSize);
uint16_t fileNameLength, extraFieldLength;
s.read ((char *)&fileNameLength, 2);
fileNameLength = le16toh (fileNameLength);
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s.read ((char *)&extraFieldLength, 2);
extraFieldLength = le16toh (extraFieldLength);
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char localFileName[255];
s.read (localFileName, fileNameLength);
localFileName[fileNameLength] = 0;
s.seekg (extraFieldLength, std::ios::cur);
// take care about data desriptor if presented
if (bitFlag & ZIP_BIT_FLAG_DATA_DESCRIPTOR)
{
size_t pos = s.tellg ();
if (!FindZipDataDescriptor (s))
{
LogPrint (eLogError, "SU3 archive data descriptor not found");
return numFiles;
}
s.read ((char *)crc32, 4);
s.read ((char *)&compressedSize, 4);
compressedSize = le32toh (compressedSize) + 4; // ??? we must consider signature as part of compressed data
s.read ((char *)&uncompressedSize, 4);
uncompressedSize = le32toh (uncompressedSize);
// now we know compressed and uncompressed size
s.seekg (pos, std::ios::beg); // back to compressed data
}
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LogPrint (eLogDebug, "Proccessing file ", localFileName, " ", compressedSize, " bytes");
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if (!compressedSize)
{
LogPrint (eLogWarning, "Unexpected size 0. Skipped");
continue;
}
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uint8_t * compressed = new uint8_t[compressedSize];
s.read ((char *)compressed, compressedSize);
if (compressionMethod) // we assume Deflate
{
CryptoPP::Inflator decompressor;
decompressor.Put (compressed, compressedSize);
decompressor.MessageEnd();
if (decompressor.MaxRetrievable () <= uncompressedSize)
{
uint8_t * uncompressed = new uint8_t[uncompressedSize];
decompressor.Get (uncompressed, uncompressedSize);
if (CryptoPP::CRC32().VerifyDigest (crc32, uncompressed, uncompressedSize))
{
i2p::data::netdb.AddRouterInfo (uncompressed, uncompressedSize);
numFiles++;
}
else
LogPrint (eLogError, "CRC32 verification failed");
delete[] uncompressed;
}
else
LogPrint (eLogError, "Actual uncompressed size ", decompressor.MaxRetrievable (), " exceed ", uncompressedSize, " from header");
}
else // no compression
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{
i2p::data::netdb.AddRouterInfo (compressed, compressedSize);
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numFiles++;
}
delete[] compressed;
if (bitFlag & ZIP_BIT_FLAG_DATA_DESCRIPTOR)
s.seekg (12, std::ios::cur); // skip data descriptor section if presented (12 = 16 - 4)
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}
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else
{
if (signature != ZIP_CENTRAL_DIRECTORY_HEADER_SIGNATURE)
LogPrint (eLogWarning, "Missing zip central directory header");
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break; // no more files
}
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size_t end = s.tellg ();
if (end - contentPos >= contentLength)
break; // we are beyond contentLength
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}
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return numFiles;
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}
const uint8_t ZIP_DATA_DESCRIPTOR_SIGNATURE[] = { 0x50, 0x4B, 0x07, 0x08 };
bool Reseeder::FindZipDataDescriptor (std::istream& s)
{
size_t nextInd = 0;
while (!s.eof ())
{
uint8_t nextByte;
s.read ((char *)&nextByte, 1);
if (nextByte == ZIP_DATA_DESCRIPTOR_SIGNATURE[nextInd])
{
nextInd++;
if (nextInd >= sizeof (ZIP_DATA_DESCRIPTOR_SIGNATURE))
return true;
}
else
nextInd = 0;
}
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return false;
}
const char CERTIFICATE_HEADER[] = "-----BEGIN CERTIFICATE-----";
const char CERTIFICATE_FOOTER[] = "-----END CERTIFICATE-----";
void Reseeder::LoadCertificate (const std::string& filename)
{
std::ifstream s(filename, std::ifstream::binary);
if (s.is_open ())
{
s.seekg (0, std::ios::end);
size_t len = s.tellg ();
s.seekg (0, std::ios::beg);
char buf[2048];
s.read (buf, len);
std::string cert (buf, len);
// assume file in pem format
auto pos1 = cert.find (CERTIFICATE_HEADER);
auto pos2 = cert.find (CERTIFICATE_FOOTER);
if (pos1 == std::string::npos || pos2 == std::string::npos)
{
LogPrint (eLogError, "Malformed certificate file");
return;
}
pos1 += strlen (CERTIFICATE_HEADER);
pos2 -= pos1;
std::string base64 = cert.substr (pos1, pos2);
CryptoPP::ByteQueue queue;
CryptoPP::Base64Decoder decoder; // regular base64 rather than I2P
decoder.Attach (new CryptoPP::Redirector (queue));
decoder.Put ((const uint8_t *)base64.data(), base64.length());
decoder.MessageEnd ();
// extract X.509
CryptoPP::BERSequenceDecoder x509Cert (queue);
CryptoPP::BERSequenceDecoder tbsCert (x509Cert);
// version
uint32_t ver;
CryptoPP::BERGeneralDecoder context (tbsCert, CryptoPP::CONTEXT_SPECIFIC | CryptoPP::CONSTRUCTED);
CryptoPP::BERDecodeUnsigned<uint32_t>(context, ver, CryptoPP::INTEGER);
// serial
CryptoPP::Integer serial;
serial.BERDecode(tbsCert);
// signature
CryptoPP::BERSequenceDecoder signature (tbsCert);
signature.SkipAll();
// issuer
std::string name;
CryptoPP::BERSequenceDecoder issuer (tbsCert);
{
CryptoPP::BERSetDecoder c (issuer); c.SkipAll();
CryptoPP::BERSetDecoder st (issuer); st.SkipAll();
CryptoPP::BERSetDecoder l (issuer); l.SkipAll();
CryptoPP::BERSetDecoder o (issuer); o.SkipAll();
CryptoPP::BERSetDecoder ou (issuer); ou.SkipAll();
CryptoPP::BERSetDecoder cn (issuer);
{
CryptoPP::BERSequenceDecoder attributes (cn);
{
CryptoPP::BERGeneralDecoder ident(attributes, CryptoPP::OBJECT_IDENTIFIER);
ident.SkipAll ();
CryptoPP::BERDecodeTextString (attributes, name, CryptoPP::UTF8_STRING);
}
}
}
issuer.SkipAll();
// validity
CryptoPP::BERSequenceDecoder validity (tbsCert);
validity.SkipAll();
// subject
CryptoPP::BERSequenceDecoder subject (tbsCert);
subject.SkipAll();
// public key
CryptoPP::BERSequenceDecoder publicKey (tbsCert);
{
CryptoPP::BERSequenceDecoder ident (publicKey);
ident.SkipAll ();
CryptoPP::BERGeneralDecoder key (publicKey, CryptoPP::BIT_STRING);
key.Skip (1); // FIXME: probably bug in crypto++
CryptoPP::BERSequenceDecoder keyPair (key);
CryptoPP::Integer n;
n.BERDecode (keyPair);
if (name.length () > 0)
{
PublicKey value;
n.Encode (value, 512);
m_SigningKeys[name] = value;
}
else
LogPrint (eLogWarning, "Unknown issuer. Skipped");
}
publicKey.SkipAll();
tbsCert.SkipAll();
x509Cert.SkipAll();
}
else
LogPrint (eLogError, "Can't open certificate file ", filename);
}
void Reseeder::LoadCertificates ()
{
boost::filesystem::path reseedDir = i2p::util::filesystem::GetCertificatesDir() / "reseed";
if (!boost::filesystem::exists (reseedDir))
{
LogPrint (eLogWarning, "Reseed certificates not loaded. ", reseedDir, " doesn't exist");
return;
}
int numCertificates = 0;
boost::filesystem::directory_iterator end; // empty
for (boost::filesystem::directory_iterator it (reseedDir); it != end; ++it)
{
if (boost::filesystem::is_regular_file (it->status()) && it->path ().extension () == ".crt")
{
LoadCertificate (it->path ().string ());
numCertificates++;
}
}
LogPrint (eLogInfo, numCertificates, " certificates loaded");
}
}
}