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check m2p3len

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orignal 2018-08-18 08:27:36 -04:00
parent e190a005db
commit 1dd003d26a
1 changed files with 6 additions and 1 deletions
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7
libi2pd/NTCP2.cpp
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@ -276,6 +276,11 @@ namespace transport
paddingLen = bufbe16toh (options + 2);
m_SessionRequestBufferLen = paddingLen + 64;
m3p2Len = bufbe16toh (options + 4);
if (m3p2Len < 16)
{
LogPrint (eLogWarning, "NTCP2: SessionRequest m3p2len=", m3p2Len, " is too short");
return false;
}
// check timestamp
auto ts = i2p::util::GetSecondsSinceEpoch ();
uint32_t tsA = bufbe32toh (options + 8);
@ -944,7 +949,7 @@ namespace transport
payload[s] = eNTCP2BlkPadding; // blk
htobe16buf (payload + s + 1, paddingSize); // size
s += 3;
RAND_bytes (payload + s, paddingSize);
memset (payload + s, 0, paddingSize);
s += paddingSize;
// send
SendNextFrame (payload, s);