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net: restrict self-advertisements with privacy networks

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Stop advertising
1) our i2p/onion address to peers from other networks
2) Local addresses of non-privacy networks to i2p/onion peers
Doing so could lead to fingerprinting ourselves.

Co-authored-by: Vasil Dimov <vd@FreeBSD.org>
This commit is contained in:
Martin Zumsande 2023-04-11 15:27:13 -04:00
parent e4d541c7cf
commit f4754b9dfb
1 changed files with 10 additions and 0 deletions
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10
src/net.cpp
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@ -164,6 +164,16 @@ bool GetLocal(CService& addr, const CNode& peer)
LOCK(g_maplocalhost_mutex);
for (const auto& entry : mapLocalHost)
{
// For privacy reasons, don't advertise our privacy-network address
// to other networks and don't advertise our other-network address
// to privacy networks.
const Network our_net{entry.first.GetNetwork()};
const Network peers_net{peer.ConnectedThroughNetwork()};
if (our_net != peers_net &&
(our_net == NET_ONION || our_net == NET_I2P ||
peers_net == NET_ONION || peers_net == NET_I2P)) {
continue;
}
int nScore = entry.second.nScore;
int nReachability = entry.first.GetReachabilityFrom(peer.addr);
if (nReachability > nBestReachability || (nReachability == nBestReachability && nScore > nBestScore))