/* * Copyright (c) 2013-2020, The PurpleI2P Project * * This file is part of Purple i2pd project and licensed under BSD3 * * See full license text in LICENSE file at top of project tree */ #include #include #include "Config.h" #include "Crypto.h" #include "Ed25519.h" #include "Timestamp.h" #include "I2NPProtocol.h" #include "NetDb.hpp" #include "FS.h" #include "util.h" #include "version.h" #include "Log.h" #include "Family.h" #include "TunnelConfig.h" #include "RouterContext.h" namespace i2p { RouterContext context; RouterContext::RouterContext (): m_LastUpdateTime (0), m_AcceptsTunnels (true), m_IsFloodfill (false), m_ShareRatio (100), m_Status (eRouterStatusOK), m_Error (eRouterErrorNone), m_NetID (I2PD_NET_ID) { } void RouterContext::Init () { srand (i2p::util::GetMillisecondsSinceEpoch () % 1000); m_StartupTime = std::chrono::steady_clock::now(); if (!Load ()) CreateNewRouter (); m_Decryptor = m_Keys.CreateDecryptor (nullptr); UpdateRouterInfo (); if (IsECIES ()) { auto initState = new i2p::crypto::NoiseSymmetricState (); i2p::tunnel::InitBuildRequestRecordNoiseState (*initState); initState->MixHash (GetIdentity ()->GetEncryptionPublicKey (), 32); // h = SHA256(h || hepk) m_InitialNoiseState.reset (initState); } } void RouterContext::CreateNewRouter () { m_Keys = i2p::data::PrivateKeys::CreateRandomKeys (i2p::data::SIGNING_KEY_TYPE_EDDSA_SHA512_ED25519); SaveKeys (); NewRouterInfo (); } void RouterContext::NewRouterInfo () { i2p::data::RouterInfo routerInfo; routerInfo.SetRouterIdentity (GetIdentity ()); uint16_t port; i2p::config::GetOption("port", port); if (!port) { port = rand () % (30777 - 9111) + 9111; // I2P network ports range if (port == 9150) port = 9151; // Tor browser } bool ipv4; i2p::config::GetOption("ipv4", ipv4); bool ipv6; i2p::config::GetOption("ipv6", ipv6); bool ssu; i2p::config::GetOption("ssu", ssu); bool ntcp2; i2p::config::GetOption("ntcp2.enabled", ntcp2); bool nat; i2p::config::GetOption("nat", nat); std::string ifname; i2p::config::GetOption("ifname", ifname); std::string ifname4; i2p::config::GetOption("ifname4", ifname4); std::string ifname6; i2p::config::GetOption("ifname6", ifname6); if (ipv4) { std::string host = "127.0.0.1"; if (!i2p::config::IsDefault("host")) i2p::config::GetOption("host", host); else if (!nat && !ifname.empty()) /* bind to interface, we have no NAT so set external address too */ host = i2p::util::net::GetInterfaceAddress(ifname, false).to_string(); // v4 if(ifname4.size()) host = i2p::util::net::GetInterfaceAddress(ifname4, false).to_string(); if (ssu) routerInfo.AddSSUAddress (host.c_str(), port, routerInfo.GetIdentHash ()); } if (ipv6) { std::string host = "::1"; if (!i2p::config::IsDefault("host") && !ipv4) // override if v6 only i2p::config::GetOption("host", host); else if (!ifname.empty()) host = i2p::util::net::GetInterfaceAddress(ifname, true).to_string(); // v6 if(ifname6.size()) host = i2p::util::net::GetInterfaceAddress(ifname6, true).to_string(); if (ssu) routerInfo.AddSSUAddress (host.c_str(), port, routerInfo.GetIdentHash ()); } routerInfo.SetCaps (i2p::data::RouterInfo::eReachable | i2p::data::RouterInfo::eSSUTesting | i2p::data::RouterInfo::eSSUIntroducer); // LR, BC routerInfo.SetProperty ("netId", std::to_string (m_NetID)); routerInfo.SetProperty ("router.version", I2P_VERSION); routerInfo.CreateBuffer (m_Keys); m_RouterInfo.SetRouterIdentity (GetIdentity ()); m_RouterInfo.Update (routerInfo.GetBuffer (), routerInfo.GetBufferLen ()); if (ntcp2) // we don't store iv in the address if non published so we must update it from keys { if (!m_NTCP2Keys) NewNTCP2Keys (); UpdateNTCP2Address (true); bool published; i2p::config::GetOption("ntcp2.published", published); if (published) { PublishNTCP2Address (port, true); if (ipv6) { // add NTCP2 ipv6 address std::string host = "::1"; if (!i2p::config::IsDefault ("ntcp2.addressv6")) i2p::config::GetOption ("ntcp2.addressv6", host); m_RouterInfo.AddNTCP2Address (m_NTCP2Keys->staticPublicKey, m_NTCP2Keys->iv, boost::asio::ip::address_v6::from_string (host), port); } } } } void RouterContext::UpdateRouterInfo () { m_RouterInfo.CreateBuffer (m_Keys); m_RouterInfo.SaveToFile (i2p::fs::DataDirPath (ROUTER_INFO)); m_LastUpdateTime = i2p::util::GetSecondsSinceEpoch (); } void RouterContext::NewNTCP2Keys () { m_StaticKeys.reset (new i2p::crypto::X25519Keys ()); m_StaticKeys->GenerateKeys (); m_NTCP2Keys.reset (new NTCP2PrivateKeys ()); m_StaticKeys->GetPrivateKey (m_NTCP2Keys->staticPrivateKey); memcpy (m_NTCP2Keys->staticPublicKey, m_StaticKeys->GetPublicKey (), 32); RAND_bytes (m_NTCP2Keys->iv, 16); // save std::ofstream fk (i2p::fs::DataDirPath (NTCP2_KEYS), std::ofstream::binary | std::ofstream::out); fk.write ((char *)m_NTCP2Keys.get (), sizeof (NTCP2PrivateKeys)); } void RouterContext::SetStatus (RouterStatus status) { if (status != m_Status) { m_Status = status; m_Error = eRouterErrorNone; switch (m_Status) { case eRouterStatusOK: SetReachable (); break; case eRouterStatusFirewalled: SetUnreachable (); break; default: ; } } } void RouterContext::UpdatePort (int port) { bool updated = false; for (auto& address : m_RouterInfo.GetAddresses ()) { if (!address->IsNTCP2 () && address->port != port) { address->port = port; updated = true; } } if (updated) UpdateRouterInfo (); } void RouterContext::PublishNTCP2Address (int port, bool publish, bool v4only) { if (!m_NTCP2Keys) return; bool updated = false; for (auto& address : m_RouterInfo.GetAddresses ()) { if (address->IsNTCP2 () && (address->port != port || address->ntcp2->isPublished != publish) && (!v4only || address->host.is_v4 ())) { if (!port && !address->port) { // select random port only if address's port is not set port = rand () % (30777 - 9111) + 9111; // I2P network ports range if (port == 9150) port = 9151; // Tor browser } if (port) address->port = port; address->cost = publish ? 3 : 14; address->ntcp2->isPublished = publish; address->ntcp2->iv = m_NTCP2Keys->iv; updated = true; } } if (updated) UpdateRouterInfo (); } void RouterContext::UpdateNTCP2Address (bool enable) { auto& addresses = m_RouterInfo.GetAddresses (); bool found = false, updated = false; for (auto it = addresses.begin (); it != addresses.end (); ++it) { if ((*it)->IsNTCP2 ()) { found = true; if (!enable) { addresses.erase (it); updated= true; } break; } } if (enable && !found) { m_RouterInfo.AddNTCP2Address (m_NTCP2Keys->staticPublicKey, m_NTCP2Keys->iv); updated = true; } if (updated) UpdateRouterInfo (); } void RouterContext::UpdateAddress (const boost::asio::ip::address& host) { bool updated = false; for (auto& address : m_RouterInfo.GetAddresses ()) { if (address->host != host && address->IsCompatible (host)) { address->host = host; if (host.is_v6 () && address->transportStyle == i2p::data::RouterInfo::eTransportSSU) { // update MTU auto mtu = i2p::util::net::GetMTU (host); if (mtu) { LogPrint (eLogDebug, "Router: Our v6 MTU=", mtu); if (mtu > 1472) { // TODO: magic constant mtu = 1472; LogPrint(eLogWarning, "Router: MTU dropped to upper limit of 1472 bytes"); } if (address->ssu) address->ssu->mtu = mtu; } } updated = true; } } auto ts = i2p::util::GetSecondsSinceEpoch (); if (updated || ts > m_LastUpdateTime + ROUTER_INFO_UPDATE_INTERVAL) UpdateRouterInfo (); } bool RouterContext::AddIntroducer (const i2p::data::RouterInfo::Introducer& introducer) { bool ret = m_RouterInfo.AddIntroducer (introducer); if (ret) UpdateRouterInfo (); return ret; } void RouterContext::RemoveIntroducer (const boost::asio::ip::udp::endpoint& e) { if (m_RouterInfo.RemoveIntroducer (e)) UpdateRouterInfo (); } void RouterContext::SetFloodfill (bool floodfill) { m_IsFloodfill = floodfill; if (floodfill) m_RouterInfo.SetCaps (m_RouterInfo.GetCaps () | i2p::data::RouterInfo::eFloodfill); else { m_RouterInfo.SetCaps (m_RouterInfo.GetCaps () & ~i2p::data::RouterInfo::eFloodfill); // we don't publish number of routers and leaseset for non-floodfill m_RouterInfo.DeleteProperty (i2p::data::ROUTER_INFO_PROPERTY_LEASESETS); m_RouterInfo.DeleteProperty (i2p::data::ROUTER_INFO_PROPERTY_ROUTERS); } UpdateRouterInfo (); } std::string RouterContext::GetFamily () const { return m_RouterInfo.GetProperty (i2p::data::ROUTER_INFO_PROPERTY_FAMILY); } void RouterContext::SetFamily (const std::string& family) { std::string signature; if (family.length () > 0) signature = i2p::data::CreateFamilySignature (family, GetIdentHash ()); if (signature.length () > 0) { m_RouterInfo.SetProperty (i2p::data::ROUTER_INFO_PROPERTY_FAMILY, family); m_RouterInfo.SetProperty (i2p::data::ROUTER_INFO_PROPERTY_FAMILY_SIG, signature); } else { m_RouterInfo.DeleteProperty (i2p::data::ROUTER_INFO_PROPERTY_FAMILY); m_RouterInfo.DeleteProperty (i2p::data::ROUTER_INFO_PROPERTY_FAMILY_SIG); } } void RouterContext::SetBandwidth (char L) { uint32_t limit = 0; enum { low, high, extra, unlim } type = high; /* detect parameters */ switch (L) { case i2p::data::CAPS_FLAG_LOW_BANDWIDTH1 : limit = 12; type = low; break; case i2p::data::CAPS_FLAG_LOW_BANDWIDTH2 : limit = 48; type = low; break; case i2p::data::CAPS_FLAG_HIGH_BANDWIDTH1 : limit = 64; type = high; break; case i2p::data::CAPS_FLAG_HIGH_BANDWIDTH2 : limit = 128; type = high; break; case i2p::data::CAPS_FLAG_HIGH_BANDWIDTH3 : limit = 256; type = high; break; case i2p::data::CAPS_FLAG_EXTRA_BANDWIDTH1 : limit = 2048; type = extra; break; case i2p::data::CAPS_FLAG_EXTRA_BANDWIDTH2 : limit = 1000000; type = unlim; break; // 1Gbyte/s default: limit = 48; type = low; } /* update caps & flags in RI */ auto caps = m_RouterInfo.GetCaps (); caps &= ~i2p::data::RouterInfo::eHighBandwidth; caps &= ~i2p::data::RouterInfo::eExtraBandwidth; switch (type) { case low : /* not set */; break; case extra : caps |= i2p::data::RouterInfo::eExtraBandwidth; break; // 'P' case unlim : caps |= i2p::data::RouterInfo::eExtraBandwidth; #if (__cplusplus >= 201703L) // C++ 17 or higher [[fallthrough]]; #endif // no break here, extra + high means 'X' case high : caps |= i2p::data::RouterInfo::eHighBandwidth; break; } m_RouterInfo.SetCaps (caps); UpdateRouterInfo (); m_BandwidthLimit = limit; } void RouterContext::SetBandwidth (int limit) { if (limit > 2000) { SetBandwidth('X'); } else if (limit > 256) { SetBandwidth('P'); } else if (limit > 128) { SetBandwidth('O'); } else if (limit > 64) { SetBandwidth('N'); } else if (limit > 48) { SetBandwidth('M'); } else if (limit > 12) { SetBandwidth('L'); } else { SetBandwidth('K'); } } void RouterContext::SetShareRatio (int percents) { if (percents < 0) percents = 0; if (percents > 100) percents = 100; m_ShareRatio = percents; } bool RouterContext::IsUnreachable () const { return m_RouterInfo.GetCaps () & i2p::data::RouterInfo::eUnreachable; } void RouterContext::RemoveNTCPAddress (bool v4only) { auto& addresses = m_RouterInfo.GetAddresses (); for (auto it = addresses.begin (); it != addresses.end ();) { if ((*it)->transportStyle == i2p::data::RouterInfo::eTransportNTCP && !(*it)->IsNTCP2 () && (!v4only || (*it)->host.is_v4 ())) { it = addresses.erase (it); if (v4only) break; // otherwise might be more than one address } else ++it; } } void RouterContext::SetUnreachable () { // set caps uint8_t caps = m_RouterInfo.GetCaps (); caps &= ~i2p::data::RouterInfo::eReachable; caps |= i2p::data::RouterInfo::eUnreachable; caps &= ~i2p::data::RouterInfo::eFloodfill; // can't be floodfill caps &= ~i2p::data::RouterInfo::eSSUIntroducer; // can't be introducer m_RouterInfo.SetCaps (caps); uint16_t port = 0; // delete previous introducers auto& addresses = m_RouterInfo.GetAddresses (); for (auto& addr : addresses) if (addr->ssu) { addr->ssu->introducers.clear (); port = addr->port; } // remove NTCP2 v4 address bool ntcp2; i2p::config::GetOption("ntcp2.enabled", ntcp2); if (ntcp2) PublishNTCP2Address (port, false, true); // update UpdateRouterInfo (); } void RouterContext::SetReachable () { // update caps uint8_t caps = m_RouterInfo.GetCaps (); caps &= ~i2p::data::RouterInfo::eUnreachable; caps |= i2p::data::RouterInfo::eReachable; caps |= i2p::data::RouterInfo::eSSUIntroducer; if (m_IsFloodfill) caps |= i2p::data::RouterInfo::eFloodfill; m_RouterInfo.SetCaps (caps); uint16_t port = 0; // delete previous introducers auto& addresses = m_RouterInfo.GetAddresses (); for (auto& addr : addresses) if (addr->ssu) { addr->ssu->introducers.clear (); port = addr->port; } // insert NTCP2 back bool ntcp2; i2p::config::GetOption("ntcp2.enabled", ntcp2); if (ntcp2) { bool published; i2p::config::GetOption ("ntcp2.published", published); if (published) { uint16_t ntcp2Port; i2p::config::GetOption ("ntcp2.port", ntcp2Port); if (!ntcp2Port) ntcp2Port = port; PublishNTCP2Address (ntcp2Port, true, true); } } // update UpdateRouterInfo (); } void RouterContext::SetSupportsV6 (bool supportsV6) { if (supportsV6) { m_RouterInfo.EnableV6 (); // insert v6 addresses if necessary bool foundSSU = false, foundNTCP2 = false; uint16_t port = 0; auto& addresses = m_RouterInfo.GetAddresses (); for (auto& addr: addresses) { if (addr->host.is_v6 ()) { if (addr->transportStyle == i2p::data::RouterInfo::eTransportSSU) foundSSU = true; else if (addr->IsPublishedNTCP2 ()) foundNTCP2 = true; } port = addr->port; } if (!port) i2p::config::GetOption("port", port); // SSU if (!foundSSU) { bool ssu; i2p::config::GetOption("ssu", ssu); if (ssu) { std::string host = "::1"; // TODO: read host m_RouterInfo.AddSSUAddress (host.c_str (), port, GetIdentHash ()); } } // NTCP2 if (!foundNTCP2) { bool ntcp2; i2p::config::GetOption("ntcp2.enabled", ntcp2); bool ntcp2Published; i2p::config::GetOption("ntcp2.published", ntcp2Published); if (ntcp2 && ntcp2Published) { std::string ntcp2Host; if (!i2p::config::IsDefault ("ntcp2.addressv6")) i2p::config::GetOption ("ntcp2.addressv6", ntcp2Host); else ntcp2Host = "::1"; uint16_t ntcp2Port; i2p::config::GetOption ("ntcp2.port", ntcp2Port); if (!ntcp2Port) ntcp2Port = port; m_RouterInfo.AddNTCP2Address (m_NTCP2Keys->staticPublicKey, m_NTCP2Keys->iv, boost::asio::ip::address::from_string (ntcp2Host), ntcp2Port); } } } else m_RouterInfo.DisableV6 (); UpdateRouterInfo (); } void RouterContext::SetSupportsV4 (bool supportsV4) { if (supportsV4) m_RouterInfo.EnableV4 (); else m_RouterInfo.DisableV4 (); UpdateRouterInfo (); } void RouterContext::UpdateNTCP2V6Address (const boost::asio::ip::address& host) { bool updated = false; auto& addresses = m_RouterInfo.GetAddresses (); for (auto& addr: addresses) { if (addr->IsPublishedNTCP2 ()) { if (addr->host.is_v6 ()) { if (addr->host != host) { addr->host = host; updated = true; } break; } } } if (updated) UpdateRouterInfo (); } void RouterContext::UpdateStats () { if (m_IsFloodfill) { // update routers and leasesets m_RouterInfo.SetProperty (i2p::data::ROUTER_INFO_PROPERTY_LEASESETS, std::to_string(i2p::data::netdb.GetNumLeaseSets ())); m_RouterInfo.SetProperty (i2p::data::ROUTER_INFO_PROPERTY_ROUTERS, std::to_string(i2p::data::netdb.GetNumRouters ())); UpdateRouterInfo (); } } void RouterContext::UpdateTimestamp (uint64_t ts) { if (ts > m_LastUpdateTime + ROUTER_INFO_UPDATE_INTERVAL) UpdateRouterInfo (); } bool RouterContext::Load () { std::ifstream fk (i2p::fs::DataDirPath (ROUTER_KEYS), std::ifstream::in | std::ifstream::binary); if (!fk.is_open ()) return false; fk.seekg (0, std::ios::end); size_t len = fk.tellg(); fk.seekg (0, std::ios::beg); if (len == sizeof (i2p::data::Keys)) // old keys file format { i2p::data::Keys keys; fk.read ((char *)&keys, sizeof (keys)); m_Keys = keys; } else // new keys file format { uint8_t * buf = new uint8_t[len]; fk.read ((char *)buf, len); m_Keys.FromBuffer (buf, len); delete[] buf; } // read NTCP2 keys if available std::ifstream n2k (i2p::fs::DataDirPath (NTCP2_KEYS), std::ifstream::in | std::ifstream::binary); if (n2k) { n2k.seekg (0, std::ios::end); len = n2k.tellg(); n2k.seekg (0, std::ios::beg); if (len == sizeof (NTCP2PrivateKeys)) { m_NTCP2Keys.reset (new NTCP2PrivateKeys ()); n2k.read ((char *)m_NTCP2Keys.get (), sizeof (NTCP2PrivateKeys)); } n2k.close (); } // read RouterInfo m_RouterInfo.SetRouterIdentity (GetIdentity ()); i2p::data::RouterInfo routerInfo(i2p::fs::DataDirPath (ROUTER_INFO)); if (!routerInfo.IsUnreachable ()) // router.info looks good { m_RouterInfo.Update (routerInfo.GetBuffer (), routerInfo.GetBufferLen ()); m_RouterInfo.SetProperty ("coreVersion", I2P_VERSION); m_RouterInfo.SetProperty ("router.version", I2P_VERSION); // Migration to 0.9.24. TODO: remove later m_RouterInfo.DeleteProperty ("coreVersion"); m_RouterInfo.DeleteProperty ("stat_uptime"); } else { LogPrint (eLogError, ROUTER_INFO, " is malformed. Creating new"); NewRouterInfo (); } if (IsUnreachable ()) SetReachable (); // we assume reachable until we discover firewall through peer tests // read NTCP2 bool ntcp2; i2p::config::GetOption("ntcp2.enabled", ntcp2); if (ntcp2) { if (!m_NTCP2Keys) NewNTCP2Keys (); UpdateNTCP2Address (true); // enable NTCP2 } else UpdateNTCP2Address (false); // disable NTCP2 return true; } void RouterContext::SaveKeys () { // save in the same format as .dat files std::ofstream fk (i2p::fs::DataDirPath (ROUTER_KEYS), std::ofstream::binary | std::ofstream::out); size_t len = m_Keys.GetFullLen (); uint8_t * buf = new uint8_t[len]; m_Keys.ToBuffer (buf, len); fk.write ((char *)buf, len); delete[] buf; } std::shared_ptr RouterContext::GetTunnelPool () const { return i2p::tunnel::tunnels.GetExploratoryPool (); } void RouterContext::HandleI2NPMessage (const uint8_t * buf, size_t len) { i2p::HandleI2NPMessage (CreateI2NPMessage (buf, GetI2NPMessageLength (buf, len))); } void RouterContext::ProcessGarlicMessage (std::shared_ptr msg) { std::unique_lock l(m_GarlicMutex); i2p::garlic::GarlicDestination::ProcessGarlicMessage (msg); } void RouterContext::ProcessDeliveryStatusMessage (std::shared_ptr msg) { std::unique_lock l(m_GarlicMutex); i2p::garlic::GarlicDestination::ProcessDeliveryStatusMessage (msg); } void RouterContext::CleanupDestination () { std::unique_lock l(m_GarlicMutex); i2p::garlic::GarlicDestination::CleanupExpiredTags (); } uint32_t RouterContext::GetUptime () const { return std::chrono::duration_cast (std::chrono::steady_clock::now() - m_StartupTime).count (); } bool RouterContext::Decrypt (const uint8_t * encrypted, uint8_t * data, BN_CTX * ctx, i2p::data::CryptoKeyType preferredCrypto) const { return m_Decryptor ? m_Decryptor->Decrypt (encrypted, data, ctx, true) : false; } bool RouterContext::DecryptTunnelBuildRecord (const uint8_t * encrypted, uint8_t * data, BN_CTX * ctx) { if (!m_Decryptor) return false; if (IsECIES ()) { if (!m_InitialNoiseState) return false; // m_InitialNoiseState is h = SHA256(h || hepk) m_CurrentNoiseState.reset (new i2p::crypto::NoiseSymmetricState (*m_InitialNoiseState)); m_CurrentNoiseState->MixHash (encrypted, 32); // h = SHA256(h || sepk) uint8_t sharedSecret[32]; m_Decryptor->Decrypt (encrypted, sharedSecret, ctx, false); m_CurrentNoiseState->MixKey (sharedSecret); encrypted += 32; uint8_t nonce[12]; memset (nonce, 0, 12); if (!i2p::crypto::AEADChaCha20Poly1305 (encrypted, TUNNEL_BUILD_RECORD_SIZE - 16, m_CurrentNoiseState->m_H, 32, m_CurrentNoiseState->m_CK, nonce, data, TUNNEL_BUILD_RECORD_SIZE - 16, false)) // decrypt { LogPrint (eLogWarning, "Router: Tunnel record AEAD decryption failed"); return false; } m_CurrentNoiseState->MixHash (encrypted, TUNNEL_BUILD_RECORD_SIZE); // h = SHA256(h || ciphertext) return true; } else return m_Decryptor->Decrypt (encrypted, data, ctx, false); } i2p::crypto::X25519Keys& RouterContext::GetStaticKeys () { if (!m_StaticKeys) { if (!m_NTCP2Keys) NewNTCP2Keys (); auto x = new i2p::crypto::X25519Keys (m_NTCP2Keys->staticPrivateKey, m_NTCP2Keys->staticPublicKey); if (!m_StaticKeys) m_StaticKeys.reset (x); else delete x; } return *m_StaticKeys; } }