mirror of
https://github.com/oxen-io/lokinet.git
synced 2024-10-29 11:05:43 +00:00
692 lines
19 KiB
C++
692 lines
19 KiB
C++
#include <iwp/session.hpp>
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#include <util/memfn.hpp>
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#include <messages/link_intro.hpp>
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#include <messages/discard.hpp>
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namespace llarp
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{
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namespace iwp
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{
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static constexpr size_t PacketOverhead = HMACSIZE + TUNNONCESIZE;
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void
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AddRandomPadding(std::vector< byte_t >& pkt, size_t min, size_t variance)
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{
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const auto sz = pkt.size();
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const size_t randpad = min + randint() % variance;
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pkt.resize(sz + randpad);
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CryptoManager::instance()->randbytes(pkt.data() + sz, randpad);
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}
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Session::Session(LinkLayer* p, RouterContact rc, AddressInfo ai)
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: m_State{State::Initial}
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, m_Inbound{false}
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, m_Parent{p}
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, m_CreatedAt{p->Now()}
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, m_RemoteAddr{ai}
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, m_ChosenAI{std::move(ai)}
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, m_RemoteRC{std::move(rc)}
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{
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token.Zero();
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GotLIM = util::memFn(&Session::GotOutboundLIM, this);
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}
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Session::Session(LinkLayer* p, Addr from)
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: m_State{State::Initial}
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, m_Inbound{true}
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, m_Parent{p}
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, m_CreatedAt{p->Now()}
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, m_RemoteAddr{from}
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{
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token.Randomize();
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GotLIM = util::memFn(&Session::GotInboundLIM, this);
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}
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void
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Session::Send_LL(const llarp_buffer_t& pkt)
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{
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LogDebug("send ", pkt.sz, " to ", m_RemoteAddr);
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m_Parent->SendTo_LL(m_RemoteAddr, pkt);
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m_LastTX = time_now_ms();
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}
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bool
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Session::GotInboundLIM(const LinkIntroMessage* msg)
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{
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if(msg->rc.enckey != m_RemoteOnionKey)
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{
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LogError("key missmatch");
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return false;
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}
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m_State = State::Ready;
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GotLIM = util::memFn(&Session::GotRenegLIM, this);
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m_RemoteRC = msg->rc;
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m_Parent->MapAddr(m_RemoteRC.pubkey, this);
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return m_Parent->SessionEstablished(this);
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}
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bool
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Session::GotOutboundLIM(const LinkIntroMessage* msg)
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{
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if(msg->rc.pubkey != m_RemoteRC.pubkey)
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{
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LogError("ident key missmatch");
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return false;
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}
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m_RemoteRC = msg->rc;
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GotLIM = util::memFn(&Session::GotRenegLIM, this);
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auto self = shared_from_this();
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SendOurLIM([self](ILinkSession::DeliveryStatus st) {
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if(st == ILinkSession::DeliveryStatus::eDeliverySuccess)
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{
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self->m_State = State::Ready;
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self->m_Parent->MapAddr(self->m_RemoteRC.pubkey, self.get());
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self->m_Parent->SessionEstablished(self.get());
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}
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});
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return true;
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}
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void
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Session::SendOurLIM(ILinkSession::CompletionHandler h)
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{
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LinkIntroMessage msg;
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msg.rc = m_Parent->GetOurRC();
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msg.N.Randomize();
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msg.P = 60000;
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if(not msg.Sign(m_Parent->Sign))
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{
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LogError("failed to sign our RC for ", m_RemoteAddr);
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return;
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}
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AlignedBuffer< LinkIntroMessage::MaxSize > data;
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llarp_buffer_t buf(data);
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if(not msg.BEncode(&buf))
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{
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LogError("failed to encode LIM for ", m_RemoteAddr);
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}
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buf.sz = buf.cur - buf.base;
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buf.cur = buf.base;
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if(!SendMessageBuffer(buf, h))
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{
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LogError("failed to send LIM to ", m_RemoteAddr);
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}
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LogDebug("sent LIM to ", m_RemoteAddr);
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}
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void
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Session::EncryptAndSend(const llarp_buffer_t& data)
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{
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std::vector< byte_t > pkt;
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pkt.resize(data.sz + PacketOverhead);
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CryptoManager::instance()->randbytes(pkt.data(), pkt.size());
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llarp_buffer_t pktbuf(pkt);
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pktbuf.base += PacketOverhead;
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pktbuf.cur = pktbuf.base;
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pktbuf.sz -= PacketOverhead;
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byte_t* nonce_ptr = pkt.data() + HMACSIZE;
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CryptoManager::instance()->xchacha20_alt(pktbuf, data, m_SessionKey,
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nonce_ptr);
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pktbuf.base = nonce_ptr;
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pktbuf.sz = data.sz + 32;
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CryptoManager::instance()->hmac(pkt.data(), pktbuf, m_SessionKey);
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pktbuf.base = pkt.data();
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pktbuf.cur = pkt.data();
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pktbuf.sz = pkt.size();
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Send_LL(pktbuf);
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}
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void
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Session::Close()
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{
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if(m_State == State::Closed)
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return;
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std::vector< byte_t > close_msg = {LLARP_PROTO_VERSION, Command::eCLOS};
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AddRandomPadding(close_msg);
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const llarp_buffer_t buf(close_msg);
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EncryptAndSend(buf);
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if(m_State == State::Ready)
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m_Parent->UnmapAddr(m_RemoteAddr);
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m_State = State::Closed;
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LogInfo("closing connection to ", m_RemoteAddr);
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}
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bool
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Session::SendMessageBuffer(const llarp_buffer_t& buf,
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ILinkSession::CompletionHandler completed)
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{
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const auto now = m_Parent->Now();
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const auto msgid = m_TXID++;
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auto& msg =
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m_TXMsgs.emplace(msgid, OutboundMessage{msgid, buf, now, completed})
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.first->second;
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auto xmit = msg.XMIT();
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AddRandomPadding(xmit);
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const llarp_buffer_t pkt(xmit);
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EncryptAndSend(pkt);
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msg.FlushUnAcked(util::memFn(&Session::EncryptAndSend, this), now);
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LogDebug("send message ", msgid);
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return true;
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}
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void
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Session::Pump()
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{
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const auto now = m_Parent->Now();
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if(m_State == State::Ready || m_State == State::LinkIntro)
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{
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if(ShouldPing())
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SendKeepAlive();
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for(auto& item : m_RXMsgs)
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{
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if(item.second.ShouldSendACKS(now))
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{
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item.second.SendACKS(util::memFn(&Session::EncryptAndSend, this),
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now);
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}
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}
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for(auto& item : m_TXMsgs)
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{
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if(item.second.ShouldFlush(now))
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{
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item.second.FlushUnAcked(
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util::memFn(&Session::EncryptAndSend, this), now);
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}
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}
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}
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}
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bool
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Session::GotRenegLIM(const LinkIntroMessage* lim)
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{
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LogDebug("renegotiate session on ", m_RemoteAddr);
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return m_Parent->SessionRenegotiate(lim->rc, m_RemoteRC);
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}
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bool
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Session::RenegotiateSession()
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{
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SendOurLIM();
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return true;
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}
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bool
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Session::ShouldPing() const
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{
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if(m_State == State::Ready)
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{
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const auto now = m_Parent->Now();
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return now - m_LastTX > PingInterval;
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}
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return false;
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}
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util::StatusObject
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Session::ExtractStatus() const
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{
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return {{"remoteAddr", m_RemoteAddr.ToString()},
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{"remoteRC", m_RemoteRC.ExtractStatus()}};
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}
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bool
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Session::TimedOut(llarp_time_t now) const
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{
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if(m_State == State::Ready || m_State == State::LinkIntro)
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{
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return now > m_LastRX && now - m_LastRX > SessionAliveTimeout;
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}
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return now - m_CreatedAt > SessionAliveTimeout;
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}
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void
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Session::Tick(llarp_time_t now)
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{
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// remove pending outbound messsages that timed out
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// inform waiters
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{
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auto itr = m_TXMsgs.begin();
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while(itr != m_TXMsgs.end())
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{
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if(itr->second.IsTimedOut(now))
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{
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itr->second.InformTimeout();
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itr = m_TXMsgs.erase(itr);
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}
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else
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++itr;
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}
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}
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{
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// remove pending inbound messages that timed out
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auto itr = m_RXMsgs.begin();
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while(itr != m_RXMsgs.end())
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{
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if(itr->second.IsTimedOut(now))
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{
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itr = m_RXMsgs.erase(itr);
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}
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else
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++itr;
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}
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}
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{
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// decay replay window
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auto itr = m_ReplayFilter.begin();
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while(itr != m_ReplayFilter.end())
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{
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if(itr->second + ReplayWindow > now)
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{
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itr = m_ReplayFilter.erase(itr);
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}
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else
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++itr;
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}
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}
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}
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using Introduction = AlignedBuffer< 64 >;
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void
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Session::GenerateAndSendIntro()
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{
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Introduction intro;
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TunnelNonce N;
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N.Randomize();
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if(not CryptoManager::instance()->transport_dh_client(
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m_SessionKey, m_ChosenAI.pubkey,
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m_Parent->RouterEncryptionSecret(), N))
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{
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LogError("failed to transport_dh_client on outbound session to ",
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m_RemoteAddr);
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return;
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}
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const auto pk = m_Parent->RouterEncryptionSecret().toPublic();
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std::copy_n(pk.begin(), pk.size(), intro.begin());
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std::copy(N.begin(), N.end(), intro.begin() + PubKey::SIZE);
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LogDebug("pk=", pk.ToHex(), " N=", N.ToHex(),
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" remote-pk=", m_ChosenAI.pubkey.ToHex());
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std::vector< byte_t > req;
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std::copy_n(intro.begin(), intro.size(), std::back_inserter(req));
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AddRandomPadding(req);
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const llarp_buffer_t buf(req);
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Send_LL(buf);
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m_State = State::Introduction;
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LogDebug("sent intro to ", m_RemoteAddr);
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}
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void
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Session::HandleCreateSessionRequest(const llarp_buffer_t& buf)
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{
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std::vector< byte_t > result;
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if(not DecryptMessage(buf, result))
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{
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LogError("failed to decrypt session request from ", m_RemoteAddr);
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return;
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}
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if(result.size() < token.size())
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{
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LogError("bad session request size, ", result.size(), " < ",
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token.size(), " from ", m_RemoteAddr);
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return;
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}
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if(not std::equal(result.begin(), result.begin() + token.size(),
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token.begin()))
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{
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LogError("token missmatch from ", m_RemoteAddr);
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return;
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}
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m_LastRX = m_Parent->Now();
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m_State = State::LinkIntro;
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SendOurLIM();
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}
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void
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Session::HandleGotIntro(const llarp_buffer_t& buf)
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{
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if(buf.sz < Introduction::SIZE)
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{
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LogWarn("intro too small from ", m_RemoteAddr);
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return;
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}
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TunnelNonce N;
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std::copy_n(buf.base, PubKey::SIZE, m_RemoteOnionKey.begin());
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std::copy_n(buf.base + PubKey::SIZE, TunnelNonce::SIZE, N.begin());
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const PubKey pk = m_Parent->TransportSecretKey().toPublic();
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LogDebug("got intro: remote-pk=", m_RemoteOnionKey.ToHex(),
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" N=", N.ToHex(), " local-pk=", pk.ToHex(), " sz=", buf.sz);
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if(not CryptoManager::instance()->transport_dh_server(
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m_SessionKey, m_RemoteOnionKey, m_Parent->TransportSecretKey(), N))
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{
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LogError("failed to transport_dh_server on inbound intro from ",
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m_RemoteAddr);
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return;
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}
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std::vector< byte_t > reply;
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std::copy_n(token.begin(), token.size(), std::back_inserter(reply));
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AddRandomPadding(reply);
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const llarp_buffer_t pkt(reply);
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m_LastRX = m_Parent->Now();
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EncryptAndSend(pkt);
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LogDebug("sent intro ack to ", m_RemoteAddr);
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m_State = State::Introduction;
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}
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void
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Session::HandleGotIntroAck(const llarp_buffer_t& buf)
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{
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std::vector< byte_t > reply;
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if(not DecryptMessage(buf, reply))
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{
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LogError("intro ack decrypt failed from ", m_RemoteAddr);
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return;
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}
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if(reply.size() < token.size())
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{
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LogError("bad intro ack size ", reply.size(), " < ", token.size(),
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" from ", m_RemoteAddr);
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return;
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}
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m_LastRX = m_Parent->Now();
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std::copy_n(reply.begin(), token.size(), token.begin());
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const llarp_buffer_t pkt(token);
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EncryptAndSend(pkt);
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LogDebug("sent session request to ", m_RemoteAddr);
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m_State = State::LinkIntro;
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}
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bool
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Session::DecryptMessage(const llarp_buffer_t& buf,
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std::vector< byte_t >& result)
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{
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if(buf.sz <= PacketOverhead)
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{
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LogError("packet too small ", buf.sz);
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return false;
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}
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ShortHash H;
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llarp_buffer_t curbuf(buf.base, buf.sz);
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curbuf.base += ShortHash::SIZE;
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curbuf.sz -= ShortHash::SIZE;
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if(not CryptoManager::instance()->hmac(H.data(), curbuf, m_SessionKey))
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{
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LogError("failed to caclulate keyed hash for ", m_RemoteAddr);
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return false;
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}
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const ShortHash expected{buf.base};
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if(H != expected)
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{
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LogError("keyed hash missmatch ", H, " != ", expected, " from ",
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m_RemoteAddr, " state=", int(m_State), " size=", buf.sz);
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return false;
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}
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const byte_t* nonce_ptr = curbuf.base;
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curbuf.base += 32;
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curbuf.sz -= 32;
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result.resize(buf.sz - PacketOverhead);
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const llarp_buffer_t outbuf(result);
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LogDebug("decrypt: ", result.size(), " bytes from ", m_RemoteAddr);
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return CryptoManager::instance()->xchacha20_alt(outbuf, curbuf,
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m_SessionKey, nonce_ptr);
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}
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void
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Session::Start()
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{
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if(m_Inbound)
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return;
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GenerateAndSendIntro();
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}
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void
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Session::HandleSessionData(const llarp_buffer_t& buf)
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{
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std::vector< byte_t > result;
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if(not DecryptMessage(buf, result))
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{
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LogError("failed to decrypt session data from ", m_RemoteAddr);
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return;
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}
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if(result.size() == token.size())
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{
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/// we got a token so we return it
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const llarp_buffer_t pktbuf(token);
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EncryptAndSend(pktbuf);
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return;
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}
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if(result[0] != LLARP_PROTO_VERSION)
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{
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LogError("protocol version missmatch ", int(result[0]),
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" != ", LLARP_PROTO_VERSION);
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return;
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}
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LogDebug("command ", int(result[1]), " from ", m_RemoteAddr);
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switch(result[1])
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{
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case Command::eXMIT:
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HandleXMIT(std::move(result));
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return;
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case Command::eDATA:
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HandleDATA(std::move(result));
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return;
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case Command::eACKS:
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HandleACKS(std::move(result));
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return;
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case Command::ePING:
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HandlePING(std::move(result));
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return;
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case Command::eNACK:
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HandleNACK(std::move(result));
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return;
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case Command::eCLOS:
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HandleCLOS(std::move(result));
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return;
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}
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LogError("invalid command ", int(result[1]));
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}
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void
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Session::HandleNACK(std::vector< byte_t > data)
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{
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if(data.size() < 10)
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{
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LogError("short nack from ", m_RemoteAddr);
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return;
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}
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uint64_t txid = bufbe64toh(data.data() + 2);
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LogDebug("got nack on ", txid, " from ", m_RemoteAddr);
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auto itr = m_TXMsgs.find(txid);
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if(itr != m_TXMsgs.end())
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{
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auto xmit = itr->second.XMIT();
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AddRandomPadding(xmit);
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const llarp_buffer_t pkt(xmit);
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EncryptAndSend(pkt);
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}
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m_LastRX = m_Parent->Now();
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}
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void
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Session::HandleXMIT(std::vector< byte_t > data)
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{
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if(data.size() < 44)
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{
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LogError("short XMIT from ", m_RemoteAddr, " ", data.size(), " < 44");
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return;
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}
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uint16_t sz = bufbe16toh(data.data() + 2);
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uint64_t rxid = bufbe64toh(data.data() + 4);
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ShortHash h{data.data() + 12};
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LogDebug("rxid=", rxid, " sz=", sz, " h=", h.ToHex());
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m_LastRX = m_Parent->Now();
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{
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// check for replay
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auto itr = m_ReplayFilter.find(rxid);
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if(itr != m_ReplayFilter.end())
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{
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LogDebug("duplicate rxid=", rxid, " from ", m_RemoteAddr);
|
|
return;
|
|
}
|
|
}
|
|
{
|
|
auto itr = m_RXMsgs.find(rxid);
|
|
if(itr == m_RXMsgs.end())
|
|
m_RXMsgs.emplace(
|
|
rxid, InboundMessage{rxid, sz, std::move(h), m_Parent->Now()});
|
|
else
|
|
LogDebug("got duplicate xmit on ", rxid, " from ", m_RemoteAddr);
|
|
}
|
|
}
|
|
|
|
void
|
|
Session::HandleDATA(std::vector< byte_t > data)
|
|
{
|
|
if(data.size() <= 12)
|
|
{
|
|
LogError("short DATA from ", m_RemoteAddr, " ", data.size());
|
|
return;
|
|
}
|
|
m_LastRX = m_Parent->Now();
|
|
uint16_t sz = bufbe16toh(data.data() + 2);
|
|
uint64_t rxid = bufbe64toh(data.data() + 4);
|
|
auto itr = m_RXMsgs.find(rxid);
|
|
if(itr == m_RXMsgs.end())
|
|
{
|
|
LogDebug("no rxid=", rxid, " for ", m_RemoteAddr);
|
|
std::vector< byte_t > nack = {
|
|
LLARP_PROTO_VERSION, Command::eNACK, 0, 0, 0, 0, 0, 0, 0, 0};
|
|
htobe64buf(nack.data() + 2, rxid);
|
|
AddRandomPadding(nack);
|
|
const llarp_buffer_t nackbuf(nack);
|
|
EncryptAndSend(nackbuf);
|
|
return;
|
|
}
|
|
|
|
{
|
|
const llarp_buffer_t buf(data.data() + 12, data.size() - 12);
|
|
itr->second.HandleData(sz, buf, m_Parent->Now());
|
|
}
|
|
|
|
if(itr->second.IsCompleted())
|
|
{
|
|
itr->second.SendACKS(util::memFn(&Session::EncryptAndSend, this),
|
|
m_Parent->Now());
|
|
if(itr->second.Verify())
|
|
{
|
|
auto msg = std::move(itr->second);
|
|
const llarp_buffer_t buf(msg.m_Data.data(), msg.m_Size);
|
|
m_Parent->HandleMessage(this, buf);
|
|
m_ReplayFilter.emplace(itr->first, m_Parent->Now());
|
|
}
|
|
else
|
|
{
|
|
LogError("hash missmatch for message ", itr->first);
|
|
}
|
|
m_RXMsgs.erase(itr);
|
|
}
|
|
}
|
|
|
|
void
|
|
Session::HandleACKS(std::vector< byte_t > data)
|
|
{
|
|
if(data.size() < 11)
|
|
{
|
|
LogError("short ACKS from ", m_RemoteAddr, " ", data.size(), " < 11");
|
|
return;
|
|
}
|
|
const auto now = m_Parent->Now();
|
|
m_LastRX = now;
|
|
uint64_t txid = bufbe64toh(data.data() + 2);
|
|
auto itr = m_TXMsgs.find(txid);
|
|
if(itr == m_TXMsgs.end())
|
|
{
|
|
LogDebug("no txid=", txid, " for ", m_RemoteAddr);
|
|
return;
|
|
}
|
|
itr->second.Ack(data[10]);
|
|
|
|
if(itr->second.IsTransmitted())
|
|
{
|
|
LogDebug("sent message ", itr->first);
|
|
itr->second.Completed();
|
|
itr = m_TXMsgs.erase(itr);
|
|
}
|
|
else
|
|
{
|
|
itr->second.FlushUnAcked(util::memFn(&Session::EncryptAndSend, this),
|
|
now);
|
|
}
|
|
}
|
|
|
|
void Session::HandleCLOS(std::vector< byte_t >)
|
|
{
|
|
LogInfo("remote closed by ", m_RemoteAddr);
|
|
Close();
|
|
}
|
|
|
|
void Session::HandlePING(std::vector< byte_t >)
|
|
{
|
|
m_LastRX = m_Parent->Now();
|
|
}
|
|
|
|
bool
|
|
Session::SendKeepAlive()
|
|
{
|
|
if(m_State == State::Ready)
|
|
{
|
|
std::vector< byte_t > ping{LLARP_PROTO_VERSION, Command::ePING};
|
|
const llarp_buffer_t buf(ping);
|
|
EncryptAndSend(buf);
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
bool
|
|
Session::IsEstablished() const
|
|
{
|
|
return m_State == State::Ready;
|
|
}
|
|
|
|
void
|
|
Session::Recv_LL(const llarp_buffer_t& buf)
|
|
{
|
|
switch(m_State)
|
|
{
|
|
case State::Initial:
|
|
if(m_Inbound)
|
|
{
|
|
// initial data
|
|
// enter introduction phase
|
|
HandleGotIntro(buf);
|
|
}
|
|
else
|
|
{
|
|
// this case should never happen
|
|
::abort();
|
|
}
|
|
break;
|
|
case State::Introduction:
|
|
if(m_Inbound)
|
|
{
|
|
// we are replying to an intro ack
|
|
HandleCreateSessionRequest(buf);
|
|
}
|
|
else
|
|
{
|
|
// we got an intro ack
|
|
// send a session request
|
|
HandleGotIntroAck(buf);
|
|
}
|
|
break;
|
|
case State::LinkIntro:
|
|
default:
|
|
HandleSessionData(buf);
|
|
break;
|
|
}
|
|
}
|
|
} // namespace iwp
|
|
} // namespace llarp
|