mirror of
https://github.com/PurpleI2P/i2pd.git
synced 2024-11-17 21:26:04 +00:00
571 lines
17 KiB
C++
571 lines
17 KiB
C++
#include <string.h>
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#include <fstream>
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#include <sstream>
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#include <boost/regex.hpp>
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#include <boost/filesystem.hpp>
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#include <cryptopp/osrng.h>
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#include <cryptopp/asn.h>
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#include <cryptopp/base64.h>
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#include <cryptopp/crc.h>
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#include <cryptopp/zinflate.h>
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#include "I2PEndian.h"
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#include "Reseed.h"
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#include "Log.h"
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#include "Identity.h"
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#include "CryptoConst.h"
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#include "NetDb.h"
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#include "util.h"
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namespace i2p
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{
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namespace data
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{
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static std::vector<std::string> httpReseedHostList = {
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// "http://193.150.121.66/netDb/", // unstable
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// "http://us.reseed.i2p2.no/", // misconfigured, not serving reseed data
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// "http://jp.reseed.i2p2.no/", // Really outdated RIs
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"http://netdb.i2p2.no/", // only SU3 (v2) support
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"http://i2p.mooo.com/netDb/",
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"http://uk.reseed.i2p2.no/",
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"http://i2p-netdb.innovatio.no/"
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};
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//TODO: Remember to add custom port support. Not all serves on 443
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static std::vector<std::string> httpsReseedHostList = {
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// "https://193.150.121.66/netDb/", // unstable
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// "https://i2p-netdb.innovatio.no/",// Vuln to POODLE
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"https://netdb.i2p2.no/", // Only SU3 (v2) support
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"https://reseed.i2p-projekt.de/", // Only HTTPS
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"https://cowpuncher.drollette.com/netdb/", // Only HTTPS and SU3 (v2) support -- will move to a new location
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"https://i2p.mooo.com/netDb/",
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"https://link.mx24.eu/", // Only HTTPS and SU3 (v2) support
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"https://i2pseed.zarrenspry.info/", // Only HTTPS and SU3 (v2) support
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"https://ieb9oopo.mooo.com/" // Only HTTPS and SU3 (v2) support
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};
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//TODO: Implement v2 reseeding. Lightweight zip library is needed.
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//TODO: Implement SU3, utils.
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Reseeder::Reseeder()
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{
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}
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Reseeder::~Reseeder()
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{
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}
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bool Reseeder::reseedNow()
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{
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try
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{
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// Seems like the best place to try to intercept with SSL
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/*ssl_server = true;
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try {
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// SSL
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}
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catch (std::exception& e)
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{
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LogPrint("Exception in SSL: ", e.what());
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}*/
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std::string reseedHost = httpReseedHostList[(rand() % httpReseedHostList.size())];
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LogPrint("Reseeding from ", reseedHost);
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std::string content = i2p::util::http::httpRequest(reseedHost);
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if (content == "")
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{
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LogPrint("Reseed failed");
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return false;
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}
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boost::regex e("<\\s*A\\s+[^>]*href\\s*=\\s*\"([^\"]*)\"", boost::regex::normal | boost::regbase::icase);
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boost::sregex_token_iterator i(content.begin(), content.end(), e, 1);
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boost::sregex_token_iterator j;
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//TODO: Ugly code, try to clean up.
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//TODO: Try to reduce N number of variables
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std::string name;
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std::string routerInfo;
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std::string tmpUrl;
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std::string filename;
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std::string ignoreFileSuffix = ".su3";
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boost::filesystem::path root = i2p::util::filesystem::GetDataDir();
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while (i != j)
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{
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name = *i++;
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if (name.find(ignoreFileSuffix)!=std::string::npos)
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continue;
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LogPrint("Downloading ", name);
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tmpUrl = reseedHost;
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tmpUrl.append(name);
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routerInfo = i2p::util::http::httpRequest(tmpUrl);
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if (routerInfo.size()==0)
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continue;
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filename = root.string();
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#ifndef _WIN32
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filename += "/netDb/r";
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#else
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filename += "\\netDb\\r";
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#endif
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filename += name.at(11); // first char in id
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#ifndef _WIN32
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filename.append("/");
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#else
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filename.append("\\");
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#endif
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filename.append(name.c_str());
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std::ofstream outfile (filename, std::ios::binary);
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outfile << routerInfo;
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outfile.close();
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}
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return true;
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}
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catch (std::exception& ex)
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{
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//TODO: error reporting
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return false;
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}
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return false;
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}
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int Reseeder::ReseedNowSU3 ()
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{
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CryptoPP::AutoSeededRandomPool rnd;
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auto ind = rnd.GenerateWord32 (0, httpReseedHostList.size() - 1);
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std::string reseedHost = httpReseedHostList[ind];
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return ReseedFromSU3 (reseedHost);
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}
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int Reseeder::ReseedFromSU3 (const std::string& host)
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{
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std::string url = host + "i2pseeds.su3";
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LogPrint (eLogInfo, "Dowloading SU3 from ", host);
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std::string su3 = i2p::util::http::httpRequest (url);
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if (su3.length () > 0)
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{
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std::stringstream s(su3);
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return ProcessSU3Stream (s);
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}
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else
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{
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LogPrint (eLogWarning, "SU3 download failed");
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return 0;
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}
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}
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int Reseeder::ProcessSU3File (const char * filename)
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{
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std::ifstream s(filename, std::ifstream::binary);
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if (s.is_open ())
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return ProcessSU3Stream (s);
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else
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{
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LogPrint (eLogError, "Can't open file ", filename);
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return 0;
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}
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}
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const char SU3_MAGIC_NUMBER[]="I2Psu3";
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const uint32_t ZIP_HEADER_SIGNATURE = 0x04034B50;
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const uint32_t ZIP_CENTRAL_DIRECTORY_HEADER_SIGNATURE = 0x02014B50;
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const uint16_t ZIP_BIT_FLAG_DATA_DESCRIPTOR = 0x0008;
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int Reseeder::ProcessSU3Stream (std::istream& s)
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{
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char magicNumber[7];
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s.read (magicNumber, 7); // magic number and zero byte 6
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if (strcmp (magicNumber, SU3_MAGIC_NUMBER))
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{
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LogPrint (eLogError, "Unexpected SU3 magic number");
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return 0;
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}
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s.seekg (1, std::ios::cur); // su3 file format version
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SigningKeyType signatureType;
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s.read ((char *)&signatureType, 2); // signature type
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signatureType = be16toh (signatureType);
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uint16_t signatureLength;
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s.read ((char *)&signatureLength, 2); // signature length
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signatureLength = be16toh (signatureLength);
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s.seekg (1, std::ios::cur); // unused
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uint8_t versionLength;
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s.read ((char *)&versionLength, 1); // version length
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s.seekg (1, std::ios::cur); // unused
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uint8_t signerIDLength;
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s.read ((char *)&signerIDLength, 1); // signer ID length
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uint64_t contentLength;
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s.read ((char *)&contentLength, 8); // content length
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contentLength = be64toh (contentLength);
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s.seekg (1, std::ios::cur); // unused
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uint8_t fileType;
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s.read ((char *)&fileType, 1); // file type
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if (fileType != 0x00) // zip file
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{
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LogPrint (eLogError, "Can't handle file type ", (int)fileType);
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return 0;
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}
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s.seekg (1, std::ios::cur); // unused
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uint8_t contentType;
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s.read ((char *)&contentType, 1); // content type
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if (contentType != 0x03) // reseed data
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{
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LogPrint (eLogError, "Unexpected content type ", (int)contentType);
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return 0;
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}
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s.seekg (12, std::ios::cur); // unused
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s.seekg (versionLength, std::ios::cur); // skip version
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char signerID[256];
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s.read (signerID, signerIDLength); // signerID
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signerID[signerIDLength] = 0;
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//try to verify signature
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auto it = m_SigningKeys.find (signerID);
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if (it != m_SigningKeys.end ())
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{
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// TODO: implement all signature types
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if (signatureType == SIGNING_KEY_TYPE_RSA_SHA512_4096)
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{
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size_t pos = s.tellg ();
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size_t tbsLen = pos + contentLength;
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uint8_t * tbs = new uint8_t[tbsLen];
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s.seekg (0, std::ios::beg);
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s.read ((char *)tbs, tbsLen);
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uint8_t * signature = new uint8_t[signatureLength];
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s.read ((char *)signature, signatureLength);
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// RSA-raw
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i2p::crypto::RSASHA5124096RawVerifier verifier(it->second);
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verifier.Update (tbs, tbsLen);
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if (!verifier.Verify (signature))
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LogPrint (eLogWarning, "SU3 signature verification failed");
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delete[] signature;
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delete[] tbs;
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s.seekg (pos, std::ios::beg);
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}
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else
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LogPrint (eLogWarning, "Signature type ", signatureType, " is not supported");
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}
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else
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LogPrint (eLogWarning, "Certificate for ", signerID, " not loaded");
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// handle content
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int numFiles = 0;
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size_t contentPos = s.tellg ();
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while (!s.eof ())
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{
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uint32_t signature;
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s.read ((char *)&signature, 4);
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signature = le32toh (signature);
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if (signature == ZIP_HEADER_SIGNATURE)
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{
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// next local file
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s.seekg (2, std::ios::cur); // version
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uint16_t bitFlag;
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s.read ((char *)&bitFlag, 2);
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bitFlag = le16toh (bitFlag);
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uint16_t compressionMethod;
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s.read ((char *)&compressionMethod, 2);
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compressionMethod = le16toh (compressionMethod);
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s.seekg (4, std::ios::cur); // skip fields we don't care about
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uint32_t compressedSize, uncompressedSize;
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uint8_t crc32[4];
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s.read ((char *)crc32, 4);
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s.read ((char *)&compressedSize, 4);
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compressedSize = le32toh (compressedSize);
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s.read ((char *)&uncompressedSize, 4);
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uncompressedSize = le32toh (uncompressedSize);
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uint16_t fileNameLength, extraFieldLength;
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s.read ((char *)&fileNameLength, 2);
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fileNameLength = le16toh (fileNameLength);
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s.read ((char *)&extraFieldLength, 2);
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extraFieldLength = le16toh (extraFieldLength);
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char localFileName[255];
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s.read (localFileName, fileNameLength);
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localFileName[fileNameLength] = 0;
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s.seekg (extraFieldLength, std::ios::cur);
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// take care about data desriptor if presented
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if (bitFlag & ZIP_BIT_FLAG_DATA_DESCRIPTOR)
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{
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size_t pos = s.tellg ();
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if (!FindZipDataDescriptor (s))
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{
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LogPrint (eLogError, "SU3 archive data descriptor not found");
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return numFiles;
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}
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s.read ((char *)crc32, 4);
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s.read ((char *)&compressedSize, 4);
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compressedSize = le32toh (compressedSize) + 4; // ??? we must consider signature as part of compressed data
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s.read ((char *)&uncompressedSize, 4);
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uncompressedSize = le32toh (uncompressedSize);
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// now we know compressed and uncompressed size
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s.seekg (pos, std::ios::beg); // back to compressed data
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}
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LogPrint (eLogDebug, "Proccessing file ", localFileName, " ", compressedSize, " bytes");
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if (!compressedSize)
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{
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LogPrint (eLogWarning, "Unexpected size 0. Skipped");
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continue;
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}
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uint8_t * compressed = new uint8_t[compressedSize];
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s.read ((char *)compressed, compressedSize);
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if (compressionMethod) // we assume Deflate
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{
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CryptoPP::Inflator decompressor;
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decompressor.Put (compressed, compressedSize);
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decompressor.MessageEnd();
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if (decompressor.MaxRetrievable () <= uncompressedSize)
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{
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uint8_t * uncompressed = new uint8_t[uncompressedSize];
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decompressor.Get (uncompressed, uncompressedSize);
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if (CryptoPP::CRC32().VerifyDigest (crc32, uncompressed, uncompressedSize))
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{
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i2p::data::netdb.AddRouterInfo (uncompressed, uncompressedSize);
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numFiles++;
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}
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else
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LogPrint (eLogError, "CRC32 verification failed");
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delete[] uncompressed;
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}
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else
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LogPrint (eLogError, "Actual uncompressed size ", decompressor.MaxRetrievable (), " exceed ", uncompressedSize, " from header");
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}
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else // no compression
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{
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i2p::data::netdb.AddRouterInfo (compressed, compressedSize);
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numFiles++;
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}
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delete[] compressed;
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if (bitFlag & ZIP_BIT_FLAG_DATA_DESCRIPTOR)
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s.seekg (12, std::ios::cur); // skip data descriptor section if presented (12 = 16 - 4)
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}
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else
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{
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if (signature != ZIP_CENTRAL_DIRECTORY_HEADER_SIGNATURE)
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LogPrint (eLogWarning, "Missing zip central directory header");
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break; // no more files
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}
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size_t end = s.tellg ();
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if (end - contentPos >= contentLength)
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break; // we are beyond contentLength
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}
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return numFiles;
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}
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const uint8_t ZIP_DATA_DESCRIPTOR_SIGNATURE[] = { 0x50, 0x4B, 0x07, 0x08 };
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bool Reseeder::FindZipDataDescriptor (std::istream& s)
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{
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size_t nextInd = 0;
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while (!s.eof ())
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{
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uint8_t nextByte;
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s.read ((char *)&nextByte, 1);
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if (nextByte == ZIP_DATA_DESCRIPTOR_SIGNATURE[nextInd])
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{
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nextInd++;
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if (nextInd >= sizeof (ZIP_DATA_DESCRIPTOR_SIGNATURE))
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return true;
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}
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else
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nextInd = 0;
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}
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return false;
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}
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const char CERTIFICATE_HEADER[] = "-----BEGIN CERTIFICATE-----";
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const char CERTIFICATE_FOOTER[] = "-----END CERTIFICATE-----";
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void Reseeder::LoadCertificate (const std::string& filename)
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{
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std::ifstream s(filename, std::ifstream::binary);
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if (s.is_open ())
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{
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s.seekg (0, std::ios::end);
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size_t len = s.tellg ();
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s.seekg (0, std::ios::beg);
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char buf[2048];
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s.read (buf, len);
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std::string cert (buf, len);
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// assume file in pem format
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auto pos1 = cert.find (CERTIFICATE_HEADER);
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auto pos2 = cert.find (CERTIFICATE_FOOTER);
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if (pos1 == std::string::npos || pos2 == std::string::npos)
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{
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LogPrint (eLogError, "Malformed certificate file");
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return;
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}
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pos1 += strlen (CERTIFICATE_HEADER);
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pos2 -= pos1;
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std::string base64 = cert.substr (pos1, pos2);
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CryptoPP::ByteQueue queue;
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CryptoPP::Base64Decoder decoder; // regular base64 rather than I2P
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decoder.Attach (new CryptoPP::Redirector (queue));
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decoder.Put ((const uint8_t *)base64.data(), base64.length());
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decoder.MessageEnd ();
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LoadCertificate (queue);
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}
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else
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LogPrint (eLogError, "Can't open certificate file ", filename);
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}
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void Reseeder::LoadCertificate (CryptoPP::ByteQueue& queue)
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{
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// extract X.509
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CryptoPP::BERSequenceDecoder x509Cert (queue);
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CryptoPP::BERSequenceDecoder tbsCert (x509Cert);
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// version
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uint32_t ver;
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CryptoPP::BERGeneralDecoder context (tbsCert, CryptoPP::CONTEXT_SPECIFIC | CryptoPP::CONSTRUCTED);
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CryptoPP::BERDecodeUnsigned<uint32_t>(context, ver, CryptoPP::INTEGER);
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// serial
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CryptoPP::Integer serial;
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serial.BERDecode(tbsCert);
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// signature
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CryptoPP::BERSequenceDecoder signature (tbsCert);
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signature.SkipAll();
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// issuer
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std::string name;
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CryptoPP::BERSequenceDecoder issuer (tbsCert);
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{
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CryptoPP::BERSetDecoder c (issuer); c.SkipAll();
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CryptoPP::BERSetDecoder st (issuer); st.SkipAll();
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CryptoPP::BERSetDecoder l (issuer); l.SkipAll();
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CryptoPP::BERSetDecoder o (issuer); o.SkipAll();
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CryptoPP::BERSetDecoder ou (issuer); ou.SkipAll();
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CryptoPP::BERSetDecoder cn (issuer);
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{
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CryptoPP::BERSequenceDecoder attributes (cn);
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{
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CryptoPP::BERGeneralDecoder ident(attributes, CryptoPP::OBJECT_IDENTIFIER);
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ident.SkipAll ();
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CryptoPP::BERDecodeTextString (attributes, name, CryptoPP::UTF8_STRING);
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}
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}
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}
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issuer.SkipAll();
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// validity
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CryptoPP::BERSequenceDecoder validity (tbsCert);
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validity.SkipAll();
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// subject
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CryptoPP::BERSequenceDecoder subject (tbsCert);
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subject.SkipAll();
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// public key
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CryptoPP::BERSequenceDecoder publicKey (tbsCert);
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{
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CryptoPP::BERSequenceDecoder ident (publicKey);
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ident.SkipAll ();
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CryptoPP::BERGeneralDecoder key (publicKey, CryptoPP::BIT_STRING);
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key.Skip (1); // FIXME: probably bug in crypto++
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CryptoPP::BERSequenceDecoder keyPair (key);
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CryptoPP::Integer n;
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n.BERDecode (keyPair);
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if (name.length () > 0)
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{
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PublicKey value;
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n.Encode (value, 512);
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m_SigningKeys[name] = value;
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}
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else
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LogPrint (eLogWarning, "Unknown issuer. Skipped");
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}
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publicKey.SkipAll();
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tbsCert.SkipAll();
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x509Cert.SkipAll();
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}
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void Reseeder::LoadCertificates ()
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{
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boost::filesystem::path reseedDir = i2p::util::filesystem::GetCertificatesDir() / "reseed";
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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)
|
|
{
|
|
static uint8_t clientHello[] =
|
|
{
|
|
0x16, // handshake
|
|
0x03, 0x02, // version (TSL 1.2)
|
|
0x00, 0x2F, // length of handshake
|
|
// handshake
|
|
0x01, // handshake type (client hello)
|
|
0x00, 0x00, 0x2B, // length of handshake payload
|
|
// client hello
|
|
0x03, 0x02, // highest version supported (TSL 1.2)
|
|
0x01, 0x01, 0x01, 0x01, // date, can be anything
|
|
0x74, 0x55, 0x18, 0x36, 0x42, 0x05, 0xC1, 0xDD, 0x4A, 0x21, 0x80, 0x80, 0xEC, 0x37,
|
|
0x11, 0x93, 0x16, 0xF4, 0x66, 0x00, 0x12, 0x67, 0xAB, 0xBA, 0xFF, 0x29, 0x13, 0x9E, // 28 random bytes
|
|
0x00, // session id length
|
|
0x00, 0x04, // chiper suites length
|
|
0x00, 0x00, // NULL_WITH_NULL_NULL
|
|
0x00, 0x35, // RSA_WITH_AES_256_CBC_SHA
|
|
0x01, // compression methods length
|
|
0x00 // no complression
|
|
};
|
|
|
|
i2p::util::http::url u(address);
|
|
boost::asio::ip::tcp::iostream site;
|
|
site.connect(u.host_, "443");
|
|
if (site.good ())
|
|
{
|
|
// send ClientHello
|
|
site.write ((char *)clientHello, sizeof (clientHello));
|
|
// read ServerHello
|
|
uint8_t type;
|
|
site.read ((char *)&type, 1);
|
|
uint16_t version;
|
|
site.read ((char *)&version, 2);
|
|
uint16_t length;
|
|
site.read ((char *)&length, 2);
|
|
length = be16toh (length);
|
|
char * serverHello = new char[length];
|
|
site.read (serverHello, length);
|
|
delete[] serverHello;
|
|
// read Certificate
|
|
site.read ((char *)&type, 1);
|
|
site.read ((char *)&version, 2);
|
|
site.read ((char *)&length, 2);
|
|
length = be16toh (length);
|
|
char * certificate = new char[length];
|
|
site.read (certificate, length);
|
|
// 0 - handshake type
|
|
// 1 - 3 - handshake payload length
|
|
// 4 - 6 - length of array of certificates
|
|
// 7 - 9 - length of certificate
|
|
if (certificate[0] == 0x0B) // handshake type certificate
|
|
{
|
|
CryptoPP::ByteQueue queue;
|
|
queue.Put ((uint8_t *)certificate + 10, length - 10);
|
|
queue.MessageEnd ();
|
|
LoadCertificate (queue);
|
|
}
|
|
else
|
|
LogPrint (eLogError, "Unexpected handshake type ", (int)certificate[0]);
|
|
delete[] certificate;
|
|
}
|
|
else
|
|
LogPrint (eLogError, "Can't connect to ", address);
|
|
return "";
|
|
}
|
|
|
|
}
|
|
}
|
|
|