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eth, les, light: enforce CHT checkpoints on fast-sync too

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This commit is contained in:
Péter Szilágyi
2019-04-16 13:20:38 +03:00
parent 78d90c47f7
commit 38f6b85638
11 changed files with 208 additions and 112 deletions
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41
eth/downloader/downloader_test.go
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@ -26,7 +26,7 @@ import (
"testing"
"time"
ethereum "github.com/ethereum/go-ethereum"
"github.com/ethereum/go-ethereum"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core/rawdb"
"github.com/ethereum/go-ethereum/core/types"
@ -75,7 +75,7 @@ func newTester() *downloadTester {
tester.stateDb = rawdb.NewMemoryDatabase()
tester.stateDb.Put(testGenesis.Root().Bytes(), []byte{0x00})
tester.downloader = New(FullSync, tester.stateDb, new(event.TypeMux), tester, nil, tester.dropPeer)
tester.downloader = New(FullSync, 0, tester.stateDb, new(event.TypeMux), tester, nil, tester.dropPeer)
return tester
}
@ -1051,6 +1051,7 @@ func testBlockHeaderAttackerDropping(t *testing.T, protocol int) {
{errUnknownPeer, false}, // Peer is unknown, was already dropped, don't double drop
{errBadPeer, true}, // Peer was deemed bad for some reason, drop it
{errStallingPeer, true}, // Peer was detected to be stalling, drop it
{errUnsyncedPeer, true}, // Peer was detected to be unsynced, drop it
{errNoPeers, false}, // No peers to download from, soft race, no issue
{errTimeout, true}, // No hashes received in due time, drop the peer
{errEmptyHeaderSet, true}, // No headers were returned as a response, drop as it's a dead end
@ -1569,3 +1570,39 @@ func TestRemoteHeaderRequestSpan(t *testing.T) {
}
}
}
// Tests that peers below a pre-configured checkpoint block are prevented from
// being fast-synced from, avoiding potential cheap eclipse attacks.
func TestCheckpointEnforcement62(t *testing.T) { testCheckpointEnforcement(t, 62, FullSync) }
func TestCheckpointEnforcement63Full(t *testing.T) { testCheckpointEnforcement(t, 63, FullSync) }
func TestCheckpointEnforcement63Fast(t *testing.T) { testCheckpointEnforcement(t, 63, FastSync) }
func TestCheckpointEnforcement64Full(t *testing.T) { testCheckpointEnforcement(t, 64, FullSync) }
func TestCheckpointEnforcement64Fast(t *testing.T) { testCheckpointEnforcement(t, 64, FastSync) }
func TestCheckpointEnforcement64Light(t *testing.T) { testCheckpointEnforcement(t, 64, LightSync) }
func testCheckpointEnforcement(t *testing.T, protocol int, mode SyncMode) {
t.Parallel()
// Create a new tester with a particular hard coded checkpoint block
tester := newTester()
defer tester.terminate()
tester.downloader.checkpoint = uint64(fsMinFullBlocks) + 256
chain := testChainBase.shorten(int(tester.downloader.checkpoint) - 1)
// Attempt to sync with the peer and validate the result
tester.newPeer("peer", protocol, chain)
var expect error
if mode == FastSync {
expect = errUnsyncedPeer
}
if err := tester.sync("peer", nil, mode); err != expect {
t.Fatalf("block sync error mismatch: have %v, want %v", err, expect)
}
if mode == FastSync {
assertOwnChain(t, tester, 1)
} else {
assertOwnChain(t, tester, chain.len())
}
}