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check PeerTest buffer size

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orignal 2025-02-24 13:58:10 -05:00
parent bf050ac465
commit 9432202fad
1 changed files with 11 additions and 2 deletions

13
libi2pd/SSU2Session.cpp
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@ -2277,8 +2277,11 @@ namespace transport
case 2: // Charlie from Bob case 2: // Charlie from Bob
{ {
// sign with Charlie's key // sign with Charlie's key
if (len < offset + 9) return;
uint8_t asz = buf[offset + 9]; uint8_t asz = buf[offset + 9];
std::vector<uint8_t> newSignedData (asz + 10 + i2p::context.GetIdentity ()->GetSignatureLen ()); size_t l = asz + 10 + i2p::context.GetIdentity ()->GetSignatureLen ();
if (len < offset + l) return;
std::vector<uint8_t> newSignedData (l);
memcpy (newSignedData.data (), buf + offset, asz + 10); memcpy (newSignedData.data (), buf + offset, asz + 10);
SignedData<128> s; SignedData<128> s;
s.Insert ((const uint8_t *)"PeerTestValidate", 16); // prologue s.Insert ((const uint8_t *)"PeerTestValidate", 16); // prologue
@ -2388,9 +2391,15 @@ namespace transport
if (GetRouterStatus () == eRouterStatusUnknown) if (GetRouterStatus () == eRouterStatusUnknown)
SetTestingState (true); SetTestingState (true);
auto r = i2p::data::netdb.FindRouter (buf + 3); // find Charlie auto r = i2p::data::netdb.FindRouter (buf + 3); // find Charlie
if (r) if (r && len >= offset + 9)
{ {
uint8_t asz = buf[offset + 9]; uint8_t asz = buf[offset + 9];
if (len < offset + asz + 10 + r->GetIdentity ()->GetSignatureLen ())
{
LogPrint (eLogWarning, "Malformed PeerTest 4 len=", len);
session->Done ();
return;
}
SignedData<128> s; SignedData<128> s;
s.Insert ((const uint8_t *)"PeerTestValidate", 16); // prologue s.Insert ((const uint8_t *)"PeerTestValidate", 16); // prologue
s.Insert (GetRemoteIdentity ()->GetIdentHash (), 32); // bhash s.Insert (GetRemoteIdentity ()->GetIdentHash (), 32); // bhash