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-rw-r--r--src/cryptonote_protocol/cryptonote_protocol_handler.inl18
-rw-r--r--src/cryptonote_protocol/enums.h1
-rw-r--r--src/cryptonote_protocol/levin_notify.cpp18
3 files changed, 28 insertions, 9 deletions
diff --git a/src/cryptonote_protocol/cryptonote_protocol_handler.inl b/src/cryptonote_protocol/cryptonote_protocol_handler.inl
index 02c416af5..bd14fe0a7 100644
--- a/src/cryptonote_protocol/cryptonote_protocol_handler.inl
+++ b/src/cryptonote_protocol/cryptonote_protocol_handler.inl
@@ -935,7 +935,19 @@ namespace cryptonote
return 1;
}
- relay_method tx_relay;
+ /* If the txes were received over i2p/tor, the default is to "forward"
+ with a randomized delay to further enhance the "white noise" behavior,
+ potentially making it harder for ISP-level spies to determine which
+ inbound link sent the tx. If the sender disabled "white noise" over
+ i2p/tor, then the sender is "fluffing" (to only outbound) i2p/tor
+ connections with the `dandelionpp_fluff` flag set. The receiver (hidden
+ service) will immediately fluff in that scenario (i.e. this assumes that a
+ sybil spy will be unable to link an IP to an i2p/tor connection). */
+
+ const epee::net_utils::zone zone = context.m_remote_address.get_zone();
+ relay_method tx_relay = zone == epee::net_utils::zone::public_ ?
+ relay_method::stem : relay_method::forward;
+
std::vector<blobdata> stem_txs{};
std::vector<blobdata> fluff_txs{};
if (arg.dandelionpp_fluff)
@@ -944,10 +956,7 @@ namespace cryptonote
fluff_txs.reserve(arg.txs.size());
}
else
- {
- tx_relay = relay_method::stem;
stem_txs.reserve(arg.txs.size());
- }
for (auto& tx : arg.txs)
{
@@ -970,6 +979,7 @@ namespace cryptonote
fluff_txs.push_back(std::move(tx));
break;
default:
+ case relay_method::forward: // not supposed to happen here
case relay_method::none:
break;
}
diff --git a/src/cryptonote_protocol/enums.h b/src/cryptonote_protocol/enums.h
index fabb82c61..c0c495837 100644
--- a/src/cryptonote_protocol/enums.h
+++ b/src/cryptonote_protocol/enums.h
@@ -37,6 +37,7 @@ namespace cryptonote
{
none = 0, //!< Received via RPC with `do_not_relay` set
local, //!< Received via RPC; trying to send over i2p/tor, etc.
+ forward, //!< Received over i2p/tor; timer delayed before ipv4/6 public broadcast
stem, //!< Received/send over network using Dandelion++ stem
fluff, //!< Received/sent over network using Dandelion++ fluff
block //!< Received in block, takes precedence over others
diff --git a/src/cryptonote_protocol/levin_notify.cpp b/src/cryptonote_protocol/levin_notify.cpp
index 56181a59b..7c482156f 100644
--- a/src/cryptonote_protocol/levin_notify.cpp
+++ b/src/cryptonote_protocol/levin_notify.cpp
@@ -357,11 +357,15 @@ namespace levin
return true;
});
- // Always send txs in stem mode over i2p/tor, see comments in `send_txs` below.
+ /* Always send with `fluff` flag, even over i2p/tor. The hidden service
+ will disable the forwarding delay and immediately fluff. The i2p/tor
+ network is therefore replacing the sybil protection of Dandelion++.
+ Dandelion++ stem phase over i2p/tor is also worth investigating
+ (with/without "noise"?). */
for (auto& connection : connections)
{
std::sort(connection.first.begin(), connection.first.end()); // don't leak receive order
- make_payload_send_txs(*zone_->p2p, std::move(connection.first), connection.second, zone_->pad_txs, zone_->is_public);
+ make_payload_send_txs(*zone_->p2p, std::move(connection.first), connection.second, zone_->pad_txs, true);
}
if (next_flush != std::chrono::steady_clock::time_point::max())
@@ -811,12 +815,11 @@ namespace levin
case relay_method::block:
return false;
case relay_method::stem:
- tx_relay = relay_method::fluff; // don't set stempool embargo when skipping to fluff
- /* fallthrough */
+ case relay_method::forward:
case relay_method::local:
if (zone_->is_public)
{
- // this will change a local tx to stem or fluff ...
+ // this will change a local/forward tx to stem or fluff ...
zone_->strand.dispatch(
dandelionpp_notify{zone_, std::addressof(core), std::move(txs), source}
);
@@ -824,6 +827,11 @@ namespace levin
}
/* fallthrough */
case relay_method::fluff:
+ /* If sending stem/forward/local txes over non public networks,
+ continue to claim that relay mode even though it used the "fluff"
+ routine. A "fluff" over i2p/tor is not the same as a "fluff" over
+ ipv4/6. Marking it as "fluff" here will make the tx immediately
+ visible externally from this node, which is not desired. */
core.on_transactions_relayed(epee::to_span(txs), tx_relay);
zone_->strand.dispatch(fluff_notify{zone_, std::move(txs), source});
break;