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I2P: End-to-End encrypted and anonymous Internet
https://i2pd.website/
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415 lines
13 KiB
415 lines
13 KiB
#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 <boost/asio.hpp> |
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#include <boost/asio/ssl.hpp> |
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#include <openssl/bn.h> |
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#include <openssl/ssl.h> |
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#include <openssl/err.h> |
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#include <zlib.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 "Crypto.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> httpsReseedHostList = |
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{ |
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"https://reseed.i2p-projekt.de/", // Only HTTPS |
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"https://i2pseed.zarrenspry.info/", // Only HTTPS and SU3 (v3) support |
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"https://i2p.mooo.com/netDb/", |
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"https://netdb.i2p2.no/", // Only SU3 (v3) support, SNI required |
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"https://us.reseed.i2p2.no:444/", |
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"https://uk.reseed.i2p2.no:444/", |
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"https://www.torontocrypto.org:8443/" |
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"https://reseed.i2p.vzaws.com:8443/", // Only SU3 (v3) support |
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"https://user.mx24.eu/", // Only HTTPS and SU3 (v3) support |
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"https://ieb9oopo.mooo.com/" // Only HTTPS and SU3 (v3) support |
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}; |
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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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int Reseeder::ReseedNowSU3 () |
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{ |
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auto ind = rand () % httpsReseedHostList.size (); |
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std::string& reseedHost = httpsReseedHostList[ind]; |
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return ReseedFromSU3 (reseedHost, true); |
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} |
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int Reseeder::ReseedFromSU3 (const std::string& host, bool https) |
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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 = https ? HttpsRequest (url) : 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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{ |
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// calculate digest |
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uint8_t digest[64]; |
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SHA512 (tbs, tbsLen, digest); |
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// encrypt signature |
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BN_CTX * bnctx = BN_CTX_new (); |
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BIGNUM * s = BN_new (), * n = BN_new (); |
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BN_bin2bn (signature, signatureLength, s); |
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BN_bin2bn (it->second, i2p::crypto::RSASHA5124096_KEY_LENGTH, n); |
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BN_mod_exp (s, s, i2p::crypto::rsae, n, bnctx); // s = s^e mod n |
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uint8_t * enSigBuf = new uint8_t[signatureLength]; |
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i2p::crypto::bn2buf (s, enSigBuf, signatureLength); |
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// digest is right aligned |
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// we can't use RSA_verify due wrong padding in SU3 |
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if (memcmp (enSigBuf + (signatureLength - 64), digest, 64)) |
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LogPrint (eLogWarning, "SU3 signature verification failed"); |
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delete[] enSigBuf; |
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BN_free (s); BN_free (n); |
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BN_CTX_free (bnctx); |
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} |
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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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uint32_t crc_32; |
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s.read ((char *)&crc_32, 4); |
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crc_32 = le32toh (crc_32); |
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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 *)&crc_32, 4); |
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crc_32 = le32toh (crc_32); |
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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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z_stream inflator; |
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memset (&inflator, 0, sizeof (inflator)); |
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inflateInit2 (&inflator, -MAX_WBITS); // no zlib header |
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uint8_t * uncompressed = new uint8_t[uncompressedSize]; |
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inflator.next_in = compressed; |
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inflator.avail_in = compressedSize; |
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inflator.next_out = uncompressed; |
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inflator.avail_out = uncompressedSize; |
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int err; |
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if ((err = inflate (&inflator, Z_SYNC_FLUSH)) >= 0) |
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{ |
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uncompressedSize -= inflator.avail_out; |
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if (crc32 (0, uncompressed, uncompressedSize) == crc_32) |
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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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} |
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else |
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LogPrint (eLogError, "decompression error ", err); |
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delete[] uncompressed; |
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inflateEnd (&inflator); |
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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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void Reseeder::LoadCertificate (const std::string& filename) |
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{ |
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SSL_CTX * ctx = SSL_CTX_new (TLSv1_method ()); |
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int ret = SSL_CTX_use_certificate_file (ctx, filename.c_str (), SSL_FILETYPE_PEM); |
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if (ret) |
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{ |
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SSL * ssl = SSL_new (ctx); |
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X509 * cert = SSL_get_certificate (ssl); |
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// verify |
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if (cert) |
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{ |
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// extract issuer name |
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char name[100]; |
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X509_NAME_oneline (X509_get_issuer_name(cert), name, 100); |
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// extract RSA key (we need n only, e = 65537) |
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RSA * key = X509_get_pubkey (cert)->pkey.rsa; |
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PublicKey value; |
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i2p::crypto::bn2buf (key->n, value, 512); |
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m_SigningKeys[name] = value; |
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} |
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SSL_free (ssl); |
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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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SSL_CTX_free (ctx); |
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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)) |
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{ |
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LogPrint (eLogWarning, "Reseed certificates not loaded. ", reseedDir, " doesn't exist"); |
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return; |
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} |
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int numCertificates = 0; |
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boost::filesystem::directory_iterator end; // empty |
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for (boost::filesystem::directory_iterator it (reseedDir); it != end; ++it) |
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{ |
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if (boost::filesystem::is_regular_file (it->status()) && it->path ().extension () == ".crt") |
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{ |
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LoadCertificate (it->path ().string ()); |
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numCertificates++; |
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} |
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} |
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LogPrint (eLogInfo, numCertificates, " certificates loaded"); |
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} |
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std::string Reseeder::HttpsRequest (const std::string& address) |
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{ |
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i2p::util::http::url u(address); |
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if (u.port_ == 80) u.port_ = 443; |
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boost::asio::io_service service; |
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boost::system::error_code ecode; |
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auto it = boost::asio::ip::tcp::resolver(service).resolve ( |
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boost::asio::ip::tcp::resolver::query (u.host_, std::to_string (u.port_)), ecode); |
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if (!ecode) |
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{ |
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boost::asio::ssl::context ctx(service, boost::asio::ssl::context::sslv23); |
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ctx.set_verify_mode(boost::asio::ssl::context::verify_none); |
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boost::asio::ssl::stream<boost::asio::ip::tcp::socket> s(service, ctx); |
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s.lowest_layer().connect (*it, ecode); |
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if (!ecode) |
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{ |
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s.handshake (boost::asio::ssl::stream_base::client, ecode); |
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if (!ecode) |
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{ |
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LogPrint (eLogInfo, "Connected to ", u.host_, ":", u.port_); |
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// send request |
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std::stringstream ss; |
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ss << "GET " << u.path_ << " HTTP/1.1\r\nHost: " << u.host_ |
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<< "\r\nAccept: */*\r\n" << "User-Agent: Wget/1.11.4\r\n" << "Connection: close\r\n\r\n"; |
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s.write_some (boost::asio::buffer (ss.str ())); |
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// read response |
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std::stringstream rs; |
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char response[1024]; size_t l = 0; |
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do |
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{ |
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l = s.read_some (boost::asio::buffer (response, 1024), ecode); |
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if (l) rs.write (response, l); |
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} |
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while (!ecode && l); |
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// process response |
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return i2p::util::http::GetHttpContent (rs); |
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} |
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else |
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LogPrint (eLogError, "SSL handshake failed: ", ecode.message ()); |
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} |
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else |
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LogPrint (eLogError, "Couldn't connect to ", u.host_, ": ", ecode.message ()); |
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} |
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else |
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LogPrint (eLogError, "Couldn't resolve address ", u.host_, ": ", ecode.message ()); |
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return ""; |
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} |
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} |
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} |
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