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verify path response

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orignal 2022-09-14 19:08:14 -04:00
parent 09e6e2940f
commit 857a2bc399
2 changed files with 20 additions and 1 deletions
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18
libi2pd/SSU2Session.cpp
View File

@ -207,6 +207,8 @@ namespace transport
if (m_RelayTag) if (m_RelayTag)
m_Server.RemoveRelay (m_RelayTag); m_Server.RemoveRelay (m_RelayTag);
m_SentHandshakePacket.reset (nullptr); m_SentHandshakePacket.reset (nullptr);
m_SessionConfirmedFragment.reset (nullptr);
m_PathChallenge.reset (nullptr);
m_SendQueue.clear (); m_SendQueue.clear ();
m_SentPackets.clear (); m_SentPackets.clear ();
m_IncompleteMessages.clear (); m_IncompleteMessages.clear ();
@ -1455,8 +1457,17 @@ namespace transport
SendPathResponse (buf + offset, size); SendPathResponse (buf + offset, size);
break; break;
case eSSU2BlkPathResponse: case eSSU2BlkPathResponse:
{
LogPrint (eLogDebug, "SSU2: Path response"); LogPrint (eLogDebug, "SSU2: Path response");
if (m_PathChallenge)
{
i2p::data::IdentHash hash;
SHA256 (buf + offset, size, hash);
if (hash == *m_PathChallenge)
m_PathChallenge.reset (nullptr);
}
break; break;
}
case eSSU2BlkFirstPacketNumber: case eSSU2BlkFirstPacketNumber:
break; break;
case eSSU2BlkPadding: case eSSU2BlkPadding:
@ -2639,7 +2650,12 @@ namespace transport
size_t len = rand () % (m_MaxPayloadSize - 3); size_t len = rand () % (m_MaxPayloadSize - 3);
htobe16buf (payload + 1, len); htobe16buf (payload + 1, len);
if (len > 0) if (len > 0)
{
RAND_bytes (payload + 3, len); RAND_bytes (payload + 3, len);
i2p::data::IdentHash * hash = new i2p::data::IdentHash ();
SHA256 (payload + 3, len, *hash);
m_PathChallenge.reset (hash);
}
len += 3; len += 3;
if (len < m_MaxPayloadSize) if (len < m_MaxPayloadSize)
len += CreatePaddingBlock (payload + len, m_MaxPayloadSize - len); len += CreatePaddingBlock (payload + len, m_MaxPayloadSize - len);
@ -2702,6 +2718,8 @@ namespace transport
else else
++it; ++it;
} }
if (m_PathChallenge)
RequestTermination (eSSU2TerminationReasonNormalClose);
} }
void SSU2Session::FlushData () void SSU2Session::FlushData ()

1
libi2pd/SSU2Session.h
View File

@ -349,6 +349,7 @@ namespace transport
boost::asio::deadline_timer m_ConnectTimer; boost::asio::deadline_timer m_ConnectTimer;
SSU2TerminationReason m_TerminationReason; SSU2TerminationReason m_TerminationReason;
size_t m_MaxPayloadSize; size_t m_MaxPayloadSize;
std::unique_ptr<i2p::data::IdentHash> m_PathChallenge;
}; };
inline uint64_t CreateHeaderMask (const uint8_t * kh, const uint8_t * nonce) inline uint64_t CreateHeaderMask (const uint8_t * kh, const uint8_t * nonce)