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736 lines
19 KiB
C++
736 lines
19 KiB
C++
#include <utp/session.hpp>
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#include <utp/linklayer.hpp>
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#include <messages/discard.hpp>
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#include <messages/link_intro.hpp>
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#include <util/metrics.hpp>
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namespace llarp
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{
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namespace utp
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{
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using namespace std::placeholders;
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void
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Session::OnLinkEstablished(ILinkLayer* p)
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{
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parent = p;
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EnterState(eLinkEstablished);
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LogDebug("link established with ", remoteAddr);
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}
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Crypto*
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Session::OurCrypto()
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{
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return parent->OurCrypto();
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}
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/// pump tx queue
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void
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Session::PumpWrite()
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{
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if(!sock)
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return;
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ssize_t expect = 0;
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std::vector< utp_iovec > vecs;
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for(const auto& vec : vecq)
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{
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expect += vec.iov_len;
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vecs.push_back(vec);
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}
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if(expect)
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{
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ssize_t s = utp_writev(sock, vecs.data(), vecs.size());
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if(s < 0)
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return;
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if(s > 0)
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lastSend = parent->Now();
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METRICS_DYNAMIC_INT_UPDATE(
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"utp.session.tx", RouterID(remoteRC.pubkey).ToString().c_str(), s);
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m_TXRate += s;
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size_t sz = s;
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while(vecq.size() && sz >= vecq.front().iov_len)
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{
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sz -= vecq.front().iov_len;
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vecq.pop_front();
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sendq.pop_front();
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}
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if(vecq.size())
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{
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auto& front = vecq.front();
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front.iov_len -= sz;
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front.iov_base = ((byte_t*)front.iov_base) + sz;
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}
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}
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}
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/// prune expired inbound messages
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void
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Session::PruneInboundMessages(llarp_time_t now)
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{
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auto itr = m_RecvMsgs.begin();
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while(itr != m_RecvMsgs.end())
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{
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if(itr->second.IsExpired(now))
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itr = m_RecvMsgs.erase(itr);
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else
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++itr;
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}
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}
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void
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Session::OutboundLinkEstablished(LinkLayer* p)
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{
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OnLinkEstablished(p);
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OutboundHandshake();
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}
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bool
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Session::DoKeyExchange(transport_dh_func dh, SharedSecret& K,
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const KeyExchangeNonce& n, const PubKey& other,
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const SecretKey& secret)
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{
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ShortHash t_h;
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static constexpr size_t TMP_SIZE = 64;
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static_assert(SharedSecret::SIZE + KeyExchangeNonce::SIZE == TMP_SIZE,
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"Invalid sizes");
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AlignedBuffer< TMP_SIZE > tmp;
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std::copy(K.begin(), K.end(), tmp.begin());
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std::copy(n.begin(), n.end(), tmp.begin() + K.size());
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// t_h = HS(K + L.n)
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if(!OurCrypto()->shorthash(t_h, llarp_buffer_t(tmp)))
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{
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LogError("failed to mix key to ", remoteAddr);
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return false;
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}
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// K = TKE(a.p, B_a.e, sk, t_h)
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if(!dh(K, other, secret, t_h))
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{
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LogError("key exchange with ", other, " failed");
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return false;
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}
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LogDebug("keys mixed with session to ", remoteAddr);
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return true;
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}
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bool
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Session::MutateKey(SharedSecret& K, const AlignedBuffer< 24 >& A)
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{
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AlignedBuffer< 56 > tmp;
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llarp_buffer_t buf{tmp};
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std::copy(K.begin(), K.end(), buf.cur);
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buf.cur += K.size();
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std::copy(A.begin(), A.end(), buf.cur);
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buf.cur = buf.base;
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return OurCrypto()->shorthash(K, buf);
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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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PruneInboundMessages(now);
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m_TXRate = 0;
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m_RXRate = 0;
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METRICS_DYNAMIC_UPDATE("utp.session.sendq",
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RouterID(remoteRC.pubkey).ToString().c_str(),
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sendq.size());
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}
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/// low level read
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bool
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Session::Recv(const byte_t* buf, size_t sz)
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{
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// mark we are alive
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Alive();
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m_RXRate += sz;
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size_t s = sz;
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METRICS_DYNAMIC_INT_UPDATE(
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"utp.session.rx", RouterID(remoteRC.pubkey).ToString().c_str(), s);
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// process leftovers
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if(recvBufOffset)
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{
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auto left = FragmentBufferSize - recvBufOffset;
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if(s >= left)
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{
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// yes it fills it
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LogDebug("process leftovers, offset=", recvBufOffset, " sz=", s,
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" left=", left);
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std::copy(buf, buf + left, recvBuf.begin() + recvBufOffset);
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s -= left;
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recvBufOffset = 0;
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buf += left;
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if(!VerifyThenDecrypt(recvBuf.data()))
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return false;
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}
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}
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// process full fragments
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while(s >= FragmentBufferSize)
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{
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recvBufOffset = 0;
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LogDebug("process full sz=", s);
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if(!VerifyThenDecrypt(buf))
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return false;
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buf += FragmentBufferSize;
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s -= FragmentBufferSize;
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}
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if(s)
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{
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// hold onto leftovers
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LogDebug("leftovers sz=", s);
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std::copy(buf, buf + s, recvBuf.begin() + recvBufOffset);
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recvBufOffset += s;
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}
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return true;
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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(state == eInitial)
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return false;
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if(sendq.size() >= MaxSendQueueSize)
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{
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return now - lastSend > 5000;
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}
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// let utp manage this
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return state == eClose;
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}
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PubKey
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Session::GetPubKey() const
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{
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return remoteRC.pubkey;
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}
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Addr
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Session::GetRemoteEndpoint() const
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{
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return remoteAddr;
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}
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/// base constructor
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Session::Session(LinkLayer* p)
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{
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state = eInitial;
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m_NextTXMsgID = 0;
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m_NextRXMsgID = 0;
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parent = p;
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remoteTransportPubKey.Zero();
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gotLIM = false;
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recvBufOffset = 0;
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lastActive = parent->Now();
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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(state != eSessionReady)
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return false;
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const auto dlt = parent->Now() - lastActive;
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return dlt >= 10000;
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}
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ILinkLayer*
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Session::GetLinkLayer() const
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{
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return parent;
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}
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void
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Session::Pump()
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{
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// pump write queue
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PumpWrite();
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// prune inbound messages
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PruneInboundMessages(parent->Now());
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}
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bool
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Session::SendMessageBuffer(const llarp_buffer_t& buf)
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{
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if(sendq.size() >= MaxSendQueueSize)
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return false;
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// preemptive pump
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if(sendq.size() >= MaxSendQueueSize / 8)
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PumpWrite();
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size_t sz = buf.sz;
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byte_t* ptr = buf.base;
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uint32_t msgid = m_NextTXMsgID++;
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while(sz)
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{
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uint32_t s = std::min(FragmentBodyPayloadSize, sz);
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if(!EncryptThenHash(ptr, msgid, s, sz - s))
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{
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LogError("EncryptThenHash failed?!");
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return false;
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}
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LogDebug("encrypted ", s, " bytes");
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ptr += s;
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sz -= s;
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}
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return true;
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}
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bool
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Session::SendKeepAlive()
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{
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if(ShouldPing())
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{
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DiscardMessage msg;
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std::array< byte_t, 128 > tmp;
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llarp_buffer_t buf(tmp);
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if(!msg.BEncode(&buf))
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return false;
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buf.sz = buf.cur - buf.base;
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buf.cur = buf.base;
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return this->SendMessageBuffer(buf);
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}
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return true;
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}
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void
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Session::OutboundHandshake()
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{
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std::array< byte_t, LinkIntroMessage::MaxSize > tmp;
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llarp_buffer_t buf(tmp);
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// build our RC
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LinkIntroMessage msg;
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msg.rc = parent->GetOurRC();
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if(!msg.rc.Verify(OurCrypto(), parent->Now()))
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{
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LogError("our RC is invalid? closing session to", remoteAddr);
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Close();
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return;
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}
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msg.N.Randomize();
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msg.P = DefaultLinkSessionLifetime;
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if(!msg.Sign(parent->Sign))
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{
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LogError("failed to sign LIM for outbound handshake to ", remoteAddr);
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Close();
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return;
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}
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// encode
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if(!msg.BEncode(&buf))
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{
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LogError("failed to encode LIM for handshake to ", remoteAddr);
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Close();
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return;
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}
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// rewind
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buf.sz = buf.cur - buf.base;
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buf.cur = buf.base;
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// send
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if(!SendMessageBuffer(buf))
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{
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LogError("failed to send handshake to ", remoteAddr);
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Close();
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return;
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}
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if(!DoKeyExchange(std::bind(&Crypto::transport_dh_client, OurCrypto(), _1,
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_2, _3, _4),
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txKey, msg.N, remoteTransportPubKey,
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parent->RouterEncryptionSecret()))
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{
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LogError("failed to mix keys for outbound session to ", remoteAddr);
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Close();
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return;
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}
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}
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Session::~Session()
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{
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if(sock)
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{
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utp_set_userdata(sock, nullptr);
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sock = nullptr;
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}
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}
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bool
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Session::EncryptThenHash(const byte_t* ptr, uint32_t msgid, uint16_t length,
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uint16_t remaining)
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{
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sendq.emplace_back();
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auto& buf = sendq.back();
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vecq.emplace_back();
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auto& vec = vecq.back();
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vec.iov_base = buf.data();
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vec.iov_len = FragmentBufferSize;
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buf.Randomize();
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byte_t* noncePtr = buf.data() + FragmentHashSize;
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byte_t* body = noncePtr + FragmentNonceSize;
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byte_t* base = body;
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AlignedBuffer< 24 > A(base);
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// skip inner nonce
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body += A.size();
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// put msgid
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htobe32buf(body, msgid);
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body += sizeof(uint32_t);
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// put length
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htobe16buf(body, length);
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body += sizeof(uint16_t);
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// put remaining
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htobe16buf(body, remaining);
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body += sizeof(uint16_t);
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// put body
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memcpy(body, ptr, length);
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llarp_buffer_t payload(base, base,
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FragmentBufferSize - FragmentOverheadSize);
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TunnelNonce nonce(noncePtr);
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// encrypt
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if(!OurCrypto()->xchacha20(payload, txKey, nonce))
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return false;
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payload.base = noncePtr;
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payload.cur = payload.base;
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payload.sz = FragmentBufferSize - FragmentHashSize;
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// key'd hash
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if(!OurCrypto()->hmac(buf.data(), payload, txKey))
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return false;
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return MutateKey(txKey, A);
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}
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void
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Session::EnterState(State st)
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{
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state = st;
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Alive();
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if(st == eSessionReady)
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{
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parent->MapAddr(remoteRC.pubkey.as_array(), this);
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if(!parent->SessionEstablished(this))
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Close();
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}
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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 {{"client", !remoteRC.IsPublicRouter()},
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{"sendBacklog", uint64_t(SendQueueBacklog())},
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{"tx", m_TXRate},
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{"rx", m_RXRate},
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{"remoteAddr", remoteAddr.ToString()},
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{"pubkey", remoteRC.pubkey.ToHex()}};
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}
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bool
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Session::GotSessionRenegotiate(const LinkIntroMessage* msg)
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{
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// check with parent and possibly process and store new rc
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if(!parent->SessionRenegotiate(msg->rc, remoteRC))
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{
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// failed to renegotiate
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Close();
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return false;
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}
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// set remote rc
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remoteRC = msg->rc;
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// recalculate rx key
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return DoKeyExchange(
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std::bind(&Crypto::transport_dh_server, OurCrypto(), _1, _2, _3, _4),
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rxKey, msg->N, remoteRC.enckey, parent->RouterEncryptionSecret());
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}
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bool
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Session::RenegotiateSession()
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{
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LinkIntroMessage lim;
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lim.rc = parent->GetOurRC();
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lim.N.Randomize();
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lim.P = 60 * 1000 * 10;
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if(!lim.Sign(parent->Sign))
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return false;
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std::array< byte_t, LinkIntroMessage::MaxSize > tmp;
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llarp_buffer_t buf(tmp);
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if(!lim.BEncode(&buf))
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return false;
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// rewind and resize buffer
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buf.sz = buf.cur - buf.base;
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buf.cur = buf.base;
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// send message
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if(!SendMessageBuffer(buf))
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return false;
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// regen our tx Key
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return DoKeyExchange(
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std::bind(&Crypto::transport_dh_client, OurCrypto(), _1, _2, _3, _4),
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txKey, lim.N, remoteRC.enckey, parent->RouterEncryptionSecret());
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}
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bool
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Session::VerifyThenDecrypt(const byte_t* ptr)
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{
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LogDebug("verify then decrypt ", remoteAddr);
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ShortHash digest;
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llarp_buffer_t hbuf(ptr + FragmentHashSize,
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FragmentBufferSize - FragmentHashSize);
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if(!OurCrypto()->hmac(digest.data(), hbuf, rxKey))
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{
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LogError("keyed hash failed");
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return false;
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}
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const ShortHash expected(ptr);
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if(expected != digest)
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{
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LogError("Message Integrity Failed: got ", digest, " from ", remoteAddr,
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" instead of ", expected);
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Close();
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return false;
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}
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llarp_buffer_t in(ptr + FragmentOverheadSize,
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FragmentBufferSize - FragmentOverheadSize);
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llarp_buffer_t out(rxFragBody);
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// decrypt
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if(!OurCrypto()->xchacha20_alt(out, in, rxKey, ptr + FragmentHashSize))
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{
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LogError("failed to decrypt message from ", remoteAddr);
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return false;
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}
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// get inner nonce
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AlignedBuffer< 24 > A(out.base);
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// advance buffer
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out.cur += A.size();
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// read msgid
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uint32_t msgid;
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if(!out.read_uint32(msgid))
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{
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LogError("failed to read msgid");
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return false;
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}
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// read length and remaining
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uint16_t length, remaining;
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if(!(out.read_uint16(length) && out.read_uint16(remaining)))
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{
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LogError("failed to read the rest of the header");
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return false;
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}
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if(length > (out.sz - (out.cur - out.base)))
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{
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// too big length
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LogError("fragment body too big");
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return false;
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}
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if(msgid < m_NextRXMsgID)
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return false;
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m_NextRXMsgID = msgid;
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// get message
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if(m_RecvMsgs.find(msgid) == m_RecvMsgs.end())
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{
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m_RecvMsgs.emplace(msgid, InboundMessage{});
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}
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auto itr = m_RecvMsgs.find(msgid);
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// add message activity
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itr->second.lastActive = parent->Now();
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// append data
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if(!itr->second.AppendData(out.cur, length))
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{
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LogError("inbound buffer is full");
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return false; // not enough room
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}
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// mutate key
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if(!MutateKey(rxKey, A))
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{
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LogError("failed to mutate rx key");
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return false;
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}
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if(remaining == 0)
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{
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// we done with this guy, prune next tick
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itr->second.lastActive = 0;
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ManagedBuffer buf(itr->second.buffer);
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// resize
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buf.underlying.sz = buf.underlying.cur - buf.underlying.base;
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// rewind
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buf.underlying.cur = buf.underlying.base;
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// process buffer
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LogDebug("got message ", msgid, " from ", remoteAddr);
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parent->HandleMessage(this, buf.underlying);
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}
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return true;
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}
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|
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void
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Session::Close()
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{
|
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if(state != eClose)
|
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{
|
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if(sock)
|
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{
|
|
if(state == eLinkEstablished || state == eSessionReady)
|
|
{
|
|
// only call shutdown and close when we are actually connected
|
|
utp_shutdown(sock, SHUT_RDWR);
|
|
utp_close(sock);
|
|
}
|
|
LogDebug("utp_close ", remoteAddr);
|
|
}
|
|
}
|
|
EnterState(eClose);
|
|
}
|
|
|
|
void
|
|
Session::Alive()
|
|
{
|
|
lastActive = parent->Now();
|
|
}
|
|
|
|
InboundSession::InboundSession(LinkLayer* p, utp_socket* s,
|
|
const Addr& addr)
|
|
: Session(p)
|
|
{
|
|
sock = s;
|
|
remoteAddr = addr;
|
|
RouterID rid = p->GetOurRC().pubkey;
|
|
OurCrypto()->shorthash(rxKey, llarp_buffer_t(rid));
|
|
remoteRC.Clear();
|
|
|
|
ABSL_ATTRIBUTE_UNUSED void* res = utp_set_userdata(sock, this);
|
|
assert(res == this);
|
|
assert(s == sock);
|
|
GotLIM = std::bind(&InboundSession::InboundLIM, this, _1);
|
|
}
|
|
|
|
bool
|
|
InboundSession::InboundLIM(const LinkIntroMessage* msg)
|
|
{
|
|
if(gotLIM && remoteRC.pubkey != msg->rc.pubkey)
|
|
{
|
|
Close();
|
|
return false;
|
|
}
|
|
if(!gotLIM)
|
|
{
|
|
remoteRC = msg->rc;
|
|
OurCrypto()->shorthash(txKey, llarp_buffer_t(remoteRC.pubkey));
|
|
|
|
if(!DoKeyExchange(std::bind(&Crypto::transport_dh_server, OurCrypto(),
|
|
_1, _2, _3, _4),
|
|
rxKey, msg->N, remoteRC.enckey,
|
|
parent->TransportSecretKey()))
|
|
return false;
|
|
|
|
std::array< byte_t, LinkIntroMessage::MaxSize > tmp;
|
|
llarp_buffer_t buf(tmp);
|
|
LinkIntroMessage replymsg;
|
|
replymsg.rc = parent->GetOurRC();
|
|
if(!replymsg.rc.Verify(OurCrypto(), parent->Now()))
|
|
{
|
|
LogError("our RC is invalid? closing session to", remoteAddr);
|
|
Close();
|
|
return false;
|
|
}
|
|
replymsg.N.Randomize();
|
|
replymsg.P = DefaultLinkSessionLifetime;
|
|
if(!replymsg.Sign(parent->Sign))
|
|
{
|
|
LogError("failed to sign LIM for inbound handshake from ",
|
|
remoteAddr);
|
|
Close();
|
|
return false;
|
|
}
|
|
// encode
|
|
if(!replymsg.BEncode(&buf))
|
|
{
|
|
LogError("failed to encode LIM for handshake from ", remoteAddr);
|
|
Close();
|
|
return false;
|
|
}
|
|
// rewind
|
|
buf.sz = buf.cur - buf.base;
|
|
buf.cur = buf.base;
|
|
// send
|
|
if(!SendMessageBuffer(buf))
|
|
{
|
|
LogError("failed to repl to handshake from ", remoteAddr);
|
|
Close();
|
|
return false;
|
|
}
|
|
if(!DoKeyExchange(std::bind(&Crypto::transport_dh_client, OurCrypto(),
|
|
_1, _2, _3, _4),
|
|
txKey, replymsg.N, remoteRC.enckey,
|
|
parent->RouterEncryptionSecret()))
|
|
|
|
return false;
|
|
LogDebug("Sent reply LIM");
|
|
gotLIM = true;
|
|
EnterState(eSessionReady);
|
|
/// future LIM are used for session renegotiation
|
|
GotLIM = std::bind(&Session::GotSessionRenegotiate, this, _1);
|
|
}
|
|
return true;
|
|
}
|
|
|
|
OutboundSession::OutboundSession(LinkLayer* p, utp_socket* s,
|
|
const RouterContact& rc,
|
|
const AddressInfo& addr)
|
|
: Session(p)
|
|
{
|
|
remoteTransportPubKey = addr.pubkey;
|
|
remoteRC = rc;
|
|
sock = s;
|
|
remoteAddr = addr;
|
|
|
|
RouterID rid = remoteRC.pubkey;
|
|
OurCrypto()->shorthash(txKey, llarp_buffer_t(rid));
|
|
rid = p->GetOurRC().pubkey;
|
|
OurCrypto()->shorthash(rxKey, llarp_buffer_t(rid));
|
|
|
|
ABSL_ATTRIBUTE_UNUSED void* res = utp_set_userdata(sock, this);
|
|
assert(res == this);
|
|
assert(s == sock);
|
|
|
|
GotLIM = std::bind(&OutboundSession::OutboundLIM, this, _1);
|
|
}
|
|
|
|
void
|
|
OutboundSession::Start()
|
|
{
|
|
utp_connect(sock, remoteAddr, remoteAddr.SockLen());
|
|
EnterState(eConnecting);
|
|
}
|
|
|
|
bool
|
|
OutboundSession::OutboundLIM(const LinkIntroMessage* msg)
|
|
{
|
|
if(gotLIM && remoteRC.pubkey != msg->rc.pubkey)
|
|
{
|
|
return false;
|
|
}
|
|
remoteRC = msg->rc;
|
|
gotLIM = true;
|
|
|
|
if(!DoKeyExchange(std::bind(&Crypto::transport_dh_server, OurCrypto(), _1,
|
|
_2, _3, _4),
|
|
rxKey, msg->N, remoteRC.enckey,
|
|
parent->RouterEncryptionSecret()))
|
|
{
|
|
Close();
|
|
return false;
|
|
}
|
|
/// future LIM are used for session renegotiation
|
|
GotLIM = std::bind(&Session::GotSessionRenegotiate, this, _1);
|
|
EnterState(eSessionReady);
|
|
return true;
|
|
}
|
|
} // namespace utp
|
|
} // namespace llarp
|