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>
#include <boost/asio.hpp>
#include <boost/asio/ssl.hpp>
#include <openssl/bn.h>
#include <openssl/ssl.h>
#include <openssl/err.h>
#include <zlib.h>
#include "I2PEndian.h"
#include "Reseed.h"
#include "Log.h"
#include "Identity.h"
#include "Crypto.h"
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#include "NetDb.h"
#include "util.h"
namespace i2p
{
namespace data
{
static std::vector<std::string> httpsReseedHostList =
{
"https://reseed.i2p-projekt.de/", // Only HTTPS
"https://i2pseed.zarrenspry.info/", // Only HTTPS and SU3 (v3) support
"https://i2p.mooo.com/netDb/",
"https://netdb.i2p2.no/", // Only SU3 (v3) support, SNI required
"https://us.reseed.i2p2.no:444/",
"https://uk.reseed.i2p2.no:444/",
"https://reseed.i2p.vzaws.com:8443/", // Only SU3 (v3) support
"https://user.mx24.eu/", // Only HTTPS and SU3 (v3) support
"https://ieb9oopo.mooo.com/" // Only HTTPS and SU3 (v3) support
};
Reseeder::Reseeder()
{
}
Reseeder::~Reseeder()
{
}
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int Reseeder::ReseedNowSU3 ()
{
auto ind = rand () % httpsReseedHostList.size ();
std::string& reseedHost = httpsReseedHostList[ind];
return ReseedFromSU3 (reseedHost, true);
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}
int Reseeder::ReseedFromSU3 (const std::string& host, bool https)
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{
std::string url = host + "i2pseeds.su3";
LogPrint (eLogInfo, "Dowloading SU3 from ", host);
std::string su3 = https ? HttpsRequest (url) : i2p::util::http::httpRequest (url);
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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
{
// calculate digest
uint8_t digest[64];
SHA512 (tbs, tbsLen, digest);
// encrypt signature
BN_CTX * bnctx = BN_CTX_new ();
BIGNUM * s = BN_new (), * n = BN_new ();
BN_bin2bn (signature, signatureLength, s);
BN_bin2bn (it->second, i2p::crypto::RSASHA5124096_KEY_LENGTH, n);
BN_mod_exp (s, s, i2p::crypto::rsae, n, bnctx); // s = s^e mod n
uint8_t * enSigBuf = new uint8_t[signatureLength];
i2p::crypto::bn2buf (s, enSigBuf, signatureLength);
// digest is right aligned
// we can't use RSA_verify due wrong padding in SU3
if (memcmp (enSigBuf + (signatureLength - 64), digest, 64))
LogPrint (eLogWarning, "SU3 signature verification failed");
delete[] enSigBuf;
BN_free (s); BN_free (n);
BN_CTX_free (bnctx);
}
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;
uint32_t crc_32;
s.read ((char *)&crc_32, 4);
crc_32 = le32toh (crc_32);
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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 *)&crc_32, 4);
crc_32 = le32toh (crc_32);
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
{
z_stream inflator;
memset (&inflator, 0, sizeof (inflator));
inflateInit2 (&inflator, -MAX_WBITS); // no zlib header
uint8_t * uncompressed = new uint8_t[uncompressedSize];
inflator.next_in = compressed;
inflator.avail_in = compressedSize;
inflator.next_out = uncompressed;
inflator.avail_out = uncompressedSize;
int err;
if ((err = inflate (&inflator, Z_SYNC_FLUSH)) >= 0)
{
uncompressedSize -= inflator.avail_out;
if (crc32 (0, uncompressed, uncompressedSize) == crc_32)
{
i2p::data::netdb.AddRouterInfo (uncompressed, uncompressedSize);
numFiles++;
}
else
LogPrint (eLogError, "CRC32 verification failed");
}
else
LogPrint (eLogError, "decompression error ", err);
delete[] uncompressed;
inflateEnd (&inflator);
}
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;
}
void Reseeder::LoadCertificate (const std::string& filename)
{
SSL_CTX * ctx = SSL_CTX_new (TLSv1_method ());
int ret = SSL_CTX_use_certificate_file (ctx, filename.c_str (), SSL_FILETYPE_PEM);
if (ret)
{
SSL * ssl = SSL_new (ctx);
X509 * cert = SSL_get_certificate (ssl);
// verify
if (cert)
{
// extract issuer name
char name[100];
X509_NAME_oneline (X509_get_issuer_name(cert), name, 100);
// extract RSA key (we need n only, e = 65537)
RSA * key = X509_get_pubkey (cert)->pkey.rsa;
PublicKey value;
i2p::crypto::bn2buf (key->n, value, 512);
m_SigningKeys[name] = value;
}
SSL_free (ssl);
}
else
LogPrint (eLogError, "Can't open certificate file ", filename);
SSL_CTX_free (ctx);
}
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");
}
std::string Reseeder::HttpsRequest (const std::string& address)
{
i2p::util::http::url u(address);
if (u.port_ == 80) u.port_ = 443;
boost::asio::io_service service;
boost::system::error_code ecode;
auto it = boost::asio::ip::tcp::resolver(service).resolve (
boost::asio::ip::tcp::resolver::query (u.host_, std::to_string (u.port_)), ecode);
if (!ecode)
{
boost::asio::ssl::context ctx(service, boost::asio::ssl::context::tlsv12);
ctx.set_verify_mode(boost::asio::ssl::context::verify_none);
boost::asio::ssl::stream<boost::asio::ip::tcp::socket> s(service, ctx);
s.lowest_layer().connect (*it, ecode);
if (!ecode)
{
s.handshake (boost::asio::ssl::stream_base::client, ecode);
if (!ecode)
{
LogPrint (eLogInfo, "Connected to ", u.host_, ":", u.port_);
// send request
std::stringstream ss;
ss << "GET " << u.path_ << " HTTP/1.1\r\nHost: " << u.host_
<< "\r\nAccept: */*\r\n" << "User-Agent: Wget/1.11.4\r\n" << "Connection: close\r\n\r\n";
s.write_some (boost::asio::buffer (ss.str ()));
// read response
std::stringstream rs;
char response[1024]; size_t l = 0;
do
{
l = s.read_some (boost::asio::buffer (response, 1024), ecode);
if (l) rs.write (response, l);
}
while (!ecode && l);
// process response
return i2p::util::http::GetHttpContent (rs);
}
else
LogPrint (eLogError, "SSL handshake failed: ", ecode.message ());
}
else
LogPrint (eLogError, "Couldn't connect to ", u.host_, ": ", ecode.message ());
}
else
LogPrint (eLogError, "Couldn't resolve address ", u.host_, ": ", ecode.message ());
return "";
}
}
}