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I2P: End-to-End encrypted and anonymous Internet
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644 lines
18 KiB
644 lines
18 KiB
#include <fstream> |
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#include <openssl/rand.h> |
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#include "Config.h" |
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#include "Crypto.h" |
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#include "Ed25519.h" |
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#include "Timestamp.h" |
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#include "I2NPProtocol.h" |
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#include "NetDb.hpp" |
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#include "FS.h" |
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#include "util.h" |
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#include "version.h" |
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#include "Log.h" |
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#include "Family.h" |
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#include "RouterContext.h" |
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namespace i2p |
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{ |
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RouterContext context; |
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RouterContext::RouterContext (): |
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m_LastUpdateTime (0), m_AcceptsTunnels (true), m_IsFloodfill (false), |
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m_StartupTime (0), m_ShareRatio (100), m_Status (eRouterStatusOK), |
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m_Error (eRouterErrorNone), m_NetID (I2PD_NET_ID) |
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{ |
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} |
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void RouterContext::Init () |
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{ |
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srand (i2p::util::GetMillisecondsSinceEpoch () % 1000); |
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m_StartupTime = i2p::util::GetSecondsSinceEpoch (); |
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if (!Load ()) |
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CreateNewRouter (); |
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m_Decryptor = m_Keys.CreateDecryptor (nullptr); |
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UpdateRouterInfo (); |
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} |
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void RouterContext::CreateNewRouter () |
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{ |
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m_Keys = i2p::data::PrivateKeys::CreateRandomKeys (i2p::data::SIGNING_KEY_TYPE_EDDSA_SHA512_ED25519); |
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SaveKeys (); |
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NewRouterInfo (); |
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} |
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void RouterContext::NewRouterInfo () |
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{ |
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i2p::data::RouterInfo routerInfo; |
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routerInfo.SetRouterIdentity (GetIdentity ()); |
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uint16_t port; i2p::config::GetOption("port", port); |
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if (!port) |
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port = rand () % (30777 - 9111) + 9111; // I2P network ports range |
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bool ipv4; i2p::config::GetOption("ipv4", ipv4); |
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bool ipv6; i2p::config::GetOption("ipv6", ipv6); |
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bool ssu; i2p::config::GetOption("ssu", ssu); |
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bool ntcp; i2p::config::GetOption("ntcp", ntcp); |
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bool ntcp2; i2p::config::GetOption("ntcp2.enabled", ntcp2); |
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bool nat; i2p::config::GetOption("nat", nat); |
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std::string ifname; i2p::config::GetOption("ifname", ifname); |
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std::string ifname4; i2p::config::GetOption("ifname4", ifname4); |
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std::string ifname6; i2p::config::GetOption("ifname6", ifname6); |
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if (ipv4) |
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{ |
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std::string host = "127.0.0.1"; |
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if (!i2p::config::IsDefault("host")) |
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i2p::config::GetOption("host", host); |
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else if (!nat && !ifname.empty()) |
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/* bind to interface, we have no NAT so set external address too */ |
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host = i2p::util::net::GetInterfaceAddress(ifname, false).to_string(); // v4 |
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if(ifname4.size()) |
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host = i2p::util::net::GetInterfaceAddress(ifname4, false).to_string(); |
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if (ssu) |
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routerInfo.AddSSUAddress (host.c_str(), port, routerInfo.GetIdentHash ()); |
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if (ntcp) |
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routerInfo.AddNTCPAddress (host.c_str(), port); |
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} |
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if (ipv6) |
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{ |
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std::string host = "::"; |
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if (!i2p::config::IsDefault("host") && !ipv4) // override if v6 only |
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i2p::config::GetOption("host", host); |
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else if (!ifname.empty()) |
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host = i2p::util::net::GetInterfaceAddress(ifname, true).to_string(); // v6 |
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if(ifname6.size()) |
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host = i2p::util::net::GetInterfaceAddress(ifname6, true).to_string(); |
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if (ssu) |
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routerInfo.AddSSUAddress (host.c_str(), port, routerInfo.GetIdentHash ()); |
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if (ntcp) |
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routerInfo.AddNTCPAddress (host.c_str(), port); |
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} |
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routerInfo.SetCaps (i2p::data::RouterInfo::eReachable | |
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i2p::data::RouterInfo::eSSUTesting | i2p::data::RouterInfo::eSSUIntroducer); // LR, BC |
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routerInfo.SetProperty ("netId", std::to_string (m_NetID)); |
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routerInfo.SetProperty ("router.version", I2P_VERSION); |
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routerInfo.CreateBuffer (m_Keys); |
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m_RouterInfo.SetRouterIdentity (GetIdentity ()); |
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m_RouterInfo.Update (routerInfo.GetBuffer (), routerInfo.GetBufferLen ()); |
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if (ntcp2) // we don't store iv in the address if non published so we must update it from keys |
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{ |
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if (!m_NTCP2Keys) NewNTCP2Keys (); |
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UpdateNTCP2Address (true); |
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} |
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} |
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void RouterContext::UpdateRouterInfo () |
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{ |
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m_RouterInfo.CreateBuffer (m_Keys); |
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m_RouterInfo.SaveToFile (i2p::fs::DataDirPath (ROUTER_INFO)); |
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m_LastUpdateTime = i2p::util::GetSecondsSinceEpoch (); |
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} |
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void RouterContext::NewNTCP2Keys () |
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{ |
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m_NTCP2Keys.reset (new NTCP2PrivateKeys ()); |
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RAND_bytes (m_NTCP2Keys->staticPrivateKey, 32); |
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RAND_bytes (m_NTCP2Keys->iv, 16); |
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BN_CTX * ctx = BN_CTX_new (); |
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i2p::crypto::GetEd25519 ()->ScalarMulB (m_NTCP2Keys->staticPrivateKey, m_NTCP2Keys->staticPublicKey, ctx); |
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BN_CTX_free (ctx); |
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// save |
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std::ofstream fk (i2p::fs::DataDirPath (NTCP2_KEYS), std::ofstream::binary | std::ofstream::out); |
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fk.write ((char *)m_NTCP2Keys.get (), sizeof (NTCP2PrivateKeys)); |
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} |
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void RouterContext::SetStatus (RouterStatus status) |
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{ |
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if (status != m_Status) |
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{ |
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m_Status = status; |
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m_Error = eRouterErrorNone; |
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switch (m_Status) |
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{ |
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case eRouterStatusOK: |
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SetReachable (); |
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break; |
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case eRouterStatusFirewalled: |
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SetUnreachable (); |
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break; |
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default: |
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; |
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} |
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} |
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} |
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void RouterContext::UpdatePort (int port) |
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{ |
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bool updated = false; |
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for (auto& address : m_RouterInfo.GetAddresses ()) |
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{ |
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if (!address->IsNTCP2 () && address->port != port) |
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{ |
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address->port = port; |
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updated = true; |
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} |
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} |
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if (updated) |
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UpdateRouterInfo (); |
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} |
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void RouterContext::PublishNTCP2Address (int port, bool publish) |
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{ |
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if (!m_NTCP2Keys) return; |
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if (!port) |
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port = rand () % (30777 - 9111) + 9111; // I2P network ports range |
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bool updated = false; |
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for (auto& address : m_RouterInfo.GetAddresses ()) |
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{ |
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if (address->IsNTCP2 () && (address->port != port || address->ntcp2->isPublished != publish)) |
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{ |
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address->port = port; |
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address->cost = publish ? 3 : 14; |
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address->ntcp2->isPublished = publish; |
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address->ntcp2->iv = m_NTCP2Keys->iv; |
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updated = true; |
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} |
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} |
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if (updated) |
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UpdateRouterInfo (); |
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} |
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void RouterContext::UpdateNTCP2Address (bool enable) |
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{ |
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auto& addresses = m_RouterInfo.GetAddresses (); |
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bool found = false, updated = false; |
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for (auto it = addresses.begin (); it != addresses.end (); ++it) |
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{ |
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if ((*it)->IsNTCP2 ()) |
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{ |
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found = true; |
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if (!enable) |
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{ |
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addresses.erase (it); |
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updated= true; |
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} |
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break; |
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} |
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} |
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if (enable && !found) |
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{ |
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m_RouterInfo.AddNTCP2Address (m_NTCP2Keys->staticPublicKey, m_NTCP2Keys->iv); |
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updated = true; |
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} |
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if (updated) |
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UpdateRouterInfo (); |
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} |
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void RouterContext::UpdateAddress (const boost::asio::ip::address& host) |
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{ |
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bool updated = false; |
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for (auto& address : m_RouterInfo.GetAddresses ()) |
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{ |
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if (address->host != host && address->IsCompatible (host)) |
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{ |
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address->host = host; |
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updated = true; |
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} |
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} |
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auto ts = i2p::util::GetSecondsSinceEpoch (); |
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if (updated || ts > m_LastUpdateTime + ROUTER_INFO_UPDATE_INTERVAL) |
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UpdateRouterInfo (); |
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} |
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bool RouterContext::AddIntroducer (const i2p::data::RouterInfo::Introducer& introducer) |
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{ |
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bool ret = m_RouterInfo.AddIntroducer (introducer); |
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if (ret) |
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UpdateRouterInfo (); |
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return ret; |
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} |
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void RouterContext::RemoveIntroducer (const boost::asio::ip::udp::endpoint& e) |
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{ |
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if (m_RouterInfo.RemoveIntroducer (e)) |
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UpdateRouterInfo (); |
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} |
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void RouterContext::SetFloodfill (bool floodfill) |
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{ |
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m_IsFloodfill = floodfill; |
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if (floodfill) |
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m_RouterInfo.SetCaps (m_RouterInfo.GetCaps () | i2p::data::RouterInfo::eFloodfill); |
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else |
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{ |
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m_RouterInfo.SetCaps (m_RouterInfo.GetCaps () & ~i2p::data::RouterInfo::eFloodfill); |
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// we don't publish number of routers and leaseset for non-floodfill |
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m_RouterInfo.DeleteProperty (i2p::data::ROUTER_INFO_PROPERTY_LEASESETS); |
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m_RouterInfo.DeleteProperty (i2p::data::ROUTER_INFO_PROPERTY_ROUTERS); |
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} |
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UpdateRouterInfo (); |
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} |
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std::string RouterContext::GetFamily () const |
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{ |
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return m_RouterInfo.GetProperty (i2p::data::ROUTER_INFO_PROPERTY_FAMILY); |
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} |
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void RouterContext::SetFamily (const std::string& family) |
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{ |
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std::string signature; |
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if (family.length () > 0) |
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signature = i2p::data::CreateFamilySignature (family, GetIdentHash ()); |
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if (signature.length () > 0) |
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{ |
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m_RouterInfo.SetProperty (i2p::data::ROUTER_INFO_PROPERTY_FAMILY, family); |
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m_RouterInfo.SetProperty (i2p::data::ROUTER_INFO_PROPERTY_FAMILY_SIG, signature); |
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} |
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else |
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{ |
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m_RouterInfo.DeleteProperty (i2p::data::ROUTER_INFO_PROPERTY_FAMILY); |
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m_RouterInfo.DeleteProperty (i2p::data::ROUTER_INFO_PROPERTY_FAMILY_SIG); |
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} |
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} |
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void RouterContext::SetBandwidth (char L) |
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{ |
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uint32_t limit = 0; |
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enum { low, high, extra, unlim } type = high; |
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/* detect parameters */ |
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switch (L) |
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{ |
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case i2p::data::CAPS_FLAG_LOW_BANDWIDTH1 : limit = 12; type = low; break; |
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case i2p::data::CAPS_FLAG_LOW_BANDWIDTH2 : limit = 48; type = low; break; |
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case i2p::data::CAPS_FLAG_HIGH_BANDWIDTH1 : limit = 64; type = high; break; |
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case i2p::data::CAPS_FLAG_HIGH_BANDWIDTH2 : limit = 128; type = high; break; |
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case i2p::data::CAPS_FLAG_HIGH_BANDWIDTH3 : limit = 256; type = high; break; |
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case i2p::data::CAPS_FLAG_EXTRA_BANDWIDTH1 : limit = 2048; type = extra; break; |
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case i2p::data::CAPS_FLAG_EXTRA_BANDWIDTH2 : limit = 1000000; type = unlim; break; // 1Gbyte/s |
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default: |
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limit = 48; type = low; |
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} |
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/* update caps & flags in RI */ |
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auto caps = m_RouterInfo.GetCaps (); |
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caps &= ~i2p::data::RouterInfo::eHighBandwidth; |
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caps &= ~i2p::data::RouterInfo::eExtraBandwidth; |
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switch (type) |
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{ |
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case low : /* not set */; break; |
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case extra : caps |= i2p::data::RouterInfo::eExtraBandwidth; break; // 'P' |
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case unlim : caps |= i2p::data::RouterInfo::eExtraBandwidth; // no break here, extra + high means 'X' |
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case high : caps |= i2p::data::RouterInfo::eHighBandwidth; break; |
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} |
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m_RouterInfo.SetCaps (caps); |
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UpdateRouterInfo (); |
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m_BandwidthLimit = limit; |
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} |
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void RouterContext::SetBandwidth (int limit) |
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{ |
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if (limit > 2000) { SetBandwidth('X'); } |
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else if (limit > 256) { SetBandwidth('P'); } |
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else if (limit > 128) { SetBandwidth('O'); } |
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else if (limit > 64) { SetBandwidth('N'); } |
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else if (limit > 48) { SetBandwidth('M'); } |
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else if (limit > 12) { SetBandwidth('L'); } |
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else { SetBandwidth('K'); } |
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} |
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void RouterContext::SetShareRatio (int percents) |
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{ |
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if (percents < 0) percents = 0; |
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if (percents > 100) percents = 100; |
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m_ShareRatio = percents; |
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} |
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bool RouterContext::IsUnreachable () const |
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{ |
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return m_RouterInfo.GetCaps () & i2p::data::RouterInfo::eUnreachable; |
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} |
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void RouterContext::SetUnreachable () |
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{ |
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// set caps |
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uint8_t caps = m_RouterInfo.GetCaps (); |
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caps &= ~i2p::data::RouterInfo::eReachable; |
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caps |= i2p::data::RouterInfo::eUnreachable; |
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caps &= ~i2p::data::RouterInfo::eFloodfill; // can't be floodfill |
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caps &= ~i2p::data::RouterInfo::eSSUIntroducer; // can't be introducer |
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m_RouterInfo.SetCaps (caps); |
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// remove NTCP address |
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auto& addresses = m_RouterInfo.GetAddresses (); |
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for (auto it = addresses.begin (); it != addresses.end (); ++it) |
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{ |
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if ((*it)->transportStyle == i2p::data::RouterInfo::eTransportNTCP && !(*it)->IsNTCP2 () && |
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(*it)->host.is_v4 ()) |
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{ |
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addresses.erase (it); |
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break; |
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} |
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} |
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// delete previous introducers |
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for (auto& addr : addresses) |
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if (addr->ssu) |
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addr->ssu->introducers.clear (); |
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// update |
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UpdateRouterInfo (); |
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} |
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void RouterContext::SetReachable () |
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{ |
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// update caps |
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uint8_t caps = m_RouterInfo.GetCaps (); |
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caps &= ~i2p::data::RouterInfo::eUnreachable; |
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caps |= i2p::data::RouterInfo::eReachable; |
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caps |= i2p::data::RouterInfo::eSSUIntroducer; |
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if (m_IsFloodfill) |
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caps |= i2p::data::RouterInfo::eFloodfill; |
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m_RouterInfo.SetCaps (caps); |
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auto& addresses = m_RouterInfo.GetAddresses (); |
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// insert NTCP back |
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bool ntcp; i2p::config::GetOption("ntcp", ntcp); |
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if (ntcp) { |
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for (const auto& addr : addresses) |
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{ |
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if (addr->transportStyle == i2p::data::RouterInfo::eTransportSSU && |
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addr->host.is_v4 ()) |
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{ |
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// insert NTCP address with host/port from SSU |
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m_RouterInfo.AddNTCPAddress (addr->host.to_string ().c_str (), addr->port); |
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break; |
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} |
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} |
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} |
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// delete previous introducers |
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for (auto& addr : addresses) |
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if (addr->ssu) |
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addr->ssu->introducers.clear (); |
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// update |
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UpdateRouterInfo (); |
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} |
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void RouterContext::SetSupportsV6 (bool supportsV6) |
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{ |
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if (supportsV6) |
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m_RouterInfo.EnableV6 (); |
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else |
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m_RouterInfo.DisableV6 (); |
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UpdateRouterInfo (); |
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} |
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void RouterContext::SetSupportsV4 (bool supportsV4) |
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{ |
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if (supportsV4) |
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m_RouterInfo.EnableV4 (); |
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else |
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m_RouterInfo.DisableV4 (); |
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UpdateRouterInfo (); |
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} |
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void RouterContext::UpdateNTCPV6Address (const boost::asio::ip::address& host) |
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{ |
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bool updated = false, found = false; |
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int port = 0; |
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auto& addresses = m_RouterInfo.GetAddresses (); |
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for (auto& addr: addresses) |
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{ |
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if (addr->host.is_v6 () && addr->transportStyle == i2p::data::RouterInfo::eTransportNTCP) |
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{ |
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if (addr->host != host) |
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{ |
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addr->host = host; |
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updated = true; |
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} |
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found = true; |
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} |
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else |
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port = addr->port; |
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} |
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if (!found) |
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{ |
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// create new address |
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m_RouterInfo.AddNTCPAddress (host.to_string ().c_str (), port); |
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auto mtu = i2p::util::net::GetMTU (host); |
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if (mtu) |
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{ |
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LogPrint (eLogDebug, "Router: Our v6 MTU=", mtu); |
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if (mtu > 1472) { // TODO: magic constant |
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mtu = 1472; |
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LogPrint(eLogWarning, "Router: MTU dropped to upper limit of 1472 bytes"); |
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} |
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} |
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m_RouterInfo.AddSSUAddress (host.to_string ().c_str (), port, GetIdentHash (), mtu ? mtu : 1472); // TODO |
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updated = true; |
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} |
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if (updated) |
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UpdateRouterInfo (); |
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} |
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void RouterContext::UpdateNTCP2V6Address (const boost::asio::ip::address& host) |
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{ |
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bool updated = false, found = false; |
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int port = 0; |
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auto& addresses = m_RouterInfo.GetAddresses (); |
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for (auto& addr: addresses) |
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{ |
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if (addr->IsPublishedNTCP2 ()) |
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{ |
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if (addr->host.is_v6 ()) |
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{ |
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if (addr->host != host) |
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{ |
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addr->host = host; |
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updated = true; |
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} |
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found = true; |
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break; |
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} |
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else |
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port = addr->port; // NTCP2 v4 |
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} |
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} |
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if (!found && port) // we have found NTCP2 v4 but not v6 |
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{ |
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m_RouterInfo.AddNTCP2Address (m_NTCP2Keys->staticPublicKey, m_NTCP2Keys->iv, host, port); |
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updated = true; |
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} |
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if (updated) |
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UpdateRouterInfo (); |
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} |
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void RouterContext::UpdateStats () |
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{ |
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if (m_IsFloodfill) |
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{ |
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// update routers and leasesets |
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m_RouterInfo.SetProperty (i2p::data::ROUTER_INFO_PROPERTY_LEASESETS, std::to_string(i2p::data::netdb.GetNumLeaseSets ())); |
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m_RouterInfo.SetProperty (i2p::data::ROUTER_INFO_PROPERTY_ROUTERS, std::to_string(i2p::data::netdb.GetNumRouters ())); |
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UpdateRouterInfo (); |
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} |
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} |
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void RouterContext::UpdateTimestamp (uint64_t ts) |
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{ |
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if (ts > m_LastUpdateTime + ROUTER_INFO_UPDATE_INTERVAL) |
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UpdateRouterInfo (); |
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} |
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bool RouterContext::Load () |
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{ |
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std::ifstream fk (i2p::fs::DataDirPath (ROUTER_KEYS), std::ifstream::in | std::ifstream::binary); |
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if (!fk.is_open ()) return false; |
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fk.seekg (0, std::ios::end); |
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size_t len = fk.tellg(); |
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fk.seekg (0, std::ios::beg); |
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if (len == sizeof (i2p::data::Keys)) // old keys file format |
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{ |
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i2p::data::Keys keys; |
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fk.read ((char *)&keys, sizeof (keys)); |
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m_Keys = keys; |
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} |
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else // new keys file format |
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{ |
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uint8_t * buf = new uint8_t[len]; |
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fk.read ((char *)buf, len); |
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m_Keys.FromBuffer (buf, len); |
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delete[] buf; |
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} |
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// read NTCP2 keys if available |
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std::ifstream n2k (i2p::fs::DataDirPath (NTCP2_KEYS), std::ifstream::in | std::ifstream::binary); |
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if (n2k) |
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{ |
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n2k.seekg (0, std::ios::end); |
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len = n2k.tellg(); |
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n2k.seekg (0, std::ios::beg); |
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if (len == sizeof (NTCP2PrivateKeys)) |
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{ |
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m_NTCP2Keys.reset (new NTCP2PrivateKeys ()); |
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n2k.read ((char *)m_NTCP2Keys.get (), sizeof (NTCP2PrivateKeys)); |
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} |
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n2k.close (); |
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} |
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// read RouterInfo |
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m_RouterInfo.SetRouterIdentity (GetIdentity ()); |
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i2p::data::RouterInfo routerInfo(i2p::fs::DataDirPath (ROUTER_INFO)); |
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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<i2p::tunnel::TunnelPool> RouterContext::GetTunnelPool () const |
|
{ |
|
return i2p::tunnel::tunnels.GetExploratoryPool (); |
|
} |
|
|
|
void RouterContext::HandleI2NPMessage (const uint8_t * buf, size_t len, std::shared_ptr<i2p::tunnel::InboundTunnel> from) |
|
{ |
|
i2p::HandleI2NPMessage (CreateI2NPMessage (buf, GetI2NPMessageLength (buf, len), from)); |
|
} |
|
|
|
void RouterContext::ProcessGarlicMessage (std::shared_ptr<I2NPMessage> msg) |
|
{ |
|
std::unique_lock<std::mutex> l(m_GarlicMutex); |
|
i2p::garlic::GarlicDestination::ProcessGarlicMessage (msg); |
|
} |
|
|
|
void RouterContext::ProcessDeliveryStatusMessage (std::shared_ptr<I2NPMessage> msg) |
|
{ |
|
std::unique_lock<std::mutex> l(m_GarlicMutex); |
|
i2p::garlic::GarlicDestination::ProcessDeliveryStatusMessage (msg); |
|
} |
|
|
|
void RouterContext::CleanupDestination () |
|
{ |
|
std::unique_lock<std::mutex> l(m_GarlicMutex); |
|
i2p::garlic::GarlicDestination::CleanupExpiredTags (); |
|
} |
|
|
|
uint32_t RouterContext::GetUptime () const |
|
{ |
|
return i2p::util::GetSecondsSinceEpoch () - m_StartupTime; |
|
} |
|
|
|
bool RouterContext::Decrypt (const uint8_t * encrypted, uint8_t * data, BN_CTX * ctx) 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) const |
|
{ |
|
return m_Decryptor ? m_Decryptor->Decrypt (encrypted, data, ctx, false) : 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; |
|
} |
|
}
|
|
|