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Merge pull request #283 from status-im/enr-updating 

Enr updating
This commit is contained in:
Kim De Mey 2020-07-20 12:05:32 +02:00 committed by GitHub
parent ac5155394f ec260dcfe4
commit 485d6db9e7
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
8 changed files with 179 additions and 53 deletions
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36
eth/p2p/discoveryv5/encoding.nim
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@ -22,7 +22,7 @@ type
AuthResponse = object
version: int
signature: array[64, byte]
record: Record
record: Option[enr.Record]
Codec* = object
localNode*: Node
@ -103,22 +103,26 @@ proc encodeAuthHeader*(rng: var BrHmacDrbgContext,
var resp = AuthResponse(version: 5)
let ln = c.localNode
# TODO: What goes over the wire now in case of no updated ENR?
if challenge.recordSeq < ln.record.seqNum:
resp.record = ln.record
resp.record = some(ln.record)
else:
resp.record = none(enr.Record)
let ephKeys = KeyPair.random(rng)
let signature = signIDNonce(c.privKey, challenge.idNonce,
ephKeys.pubkey.toRaw)
resp.signature = signature.toRaw
let secrets = deriveKeys(ln.id, toId, ephKeys.seckey, challenge.pubKey,
# Calling `encodePacket` for handshake should always be with a challenge
# with the pubkey of the node we are targetting.
doAssert(challenge.pubKey.isSome())
let secrets = deriveKeys(ln.id, toId, ephKeys.seckey, challenge.pubKey.get(),
challenge.idNonce)
let respRlp = rlp.encode(resp)
var zeroNonce: array[gcmNonceSize, byte]
let respEnc = encryptGCM(secrets.authRespKey, zeroNonce, respRLP, [])
let respEnc = encryptGCM(secrets.authRespKey, zeroNonce, respRlp, [])
let header = AuthHeader(auth: nonce, idNonce: challenge.idNonce,
scheme: authSchemeName, ephemeralKey: ephKeys.pubkey.toRaw,
@ -248,7 +252,8 @@ proc decodeMessage(body: openarray[byte]): DecodeResult[Message] =
proc decodeAuthResp*(c: Codec, fromId: NodeId, head: AuthHeader,
challenge: Whoareyou, newNode: var Node): DecodeResult[HandshakeSecrets] =
## Decrypts and decodes the auth-response, which is part of the auth-header.
## Requiers the id-nonce from the WHOAREYOU packet that was send.
## Requires the id-nonce from the WHOAREYOU packet that was send.
## newNode can be nil in case node was already known (no was ENR send).
if head.scheme != authSchemeName:
warn "Unknown auth scheme"
return err(HandshakeError)
@ -269,19 +274,26 @@ proc decodeAuthResp*(c: Codec, fromId: NodeId, head: AuthHeader,
authResp = rlp.decode(respData.get(), AuthResponse)
except RlpError, ValueError:
return err(HandshakeError)
# TODO:
# Should allow for not having an ENR included, solved for now by sending
# whoareyou with always recordSeq of 0
# Node returned might not have an address or not a valid address
newNode = ? newNode(authResp.record).mapErrTo(HandshakeError)
var pubKey: PublicKey
if authResp.record.isSome():
# Node returned might not have an address or not a valid address.
newNode = ? newNode(authResp.record.get()).mapErrTo(HandshakeError)
if newNode.id != fromId:
return err(HandshakeError)
pubKey = newNode.pubKey
else:
if challenge.pubKey.isSome():
pubKey = challenge.pubKey.get()
else:
# We should have received a Record in this case.
return err(HandshakeError)
# Verify the id-nonce-sig
let sig = ? SignatureNR.fromRaw(authResp.signature).mapErrTo(HandshakeError)
let h = idNonceHash(head.idNonce, head.ephemeralKey)
if verify(sig, SkMessage(h.data), newNode.pubkey):
if verify(sig, SkMessage(h.data), pubkey):
ok(secrets)
else:
err(HandshakeError)

5
eth/p2p/discoveryv5/enr.nim
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@ -450,11 +450,8 @@ proc `$`(f: Field): string =
proc `$`*(r: Record): string =
result = "("
var first = true
result &= $r.seqNum
for (k, v) in r.pairs:
if first:
first = false
else:
result &= ", "
result &= k
result &= ": "

25
eth/p2p/discoveryv5/protocol.nim
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@ -249,7 +249,12 @@ proc decodeWhoAreYou(d: Protocol, packet: openArray[byte]):
proc sendWhoareyou(d: Protocol, address: Address, toNode: NodeId,
authTag: AuthTag): DiscResult[void] {.raises: [Exception, Defect].} =
trace "sending who are you", to = $toNode, toAddress = $address
let challenge = Whoareyou(authTag: authTag, recordSeq: 0)
let n = d.getNode(toNode)
let challenge = if n.isSome():
Whoareyou(authTag: authTag, recordSeq: n.get().record.seqNum,
pubKey: some(n.get().pubkey))
else:
Whoareyou(authTag: authTag, recordSeq: 0)
brHmacDrbgGenerate(d.rng[], challenge.idNonce)
# If there is already a handshake going on for this nodeid then we drop this
@ -353,7 +358,7 @@ proc receive*(d: Protocol, a: Address, packet: openArray[byte]) {.gcsafe,
var pr: PendingRequest
if d.pendingRequests.take(whoareyou.authTag, pr):
let toNode = pr.node
whoareyou.pubKey = toNode.pubkey # TODO: Yeah, rather ugly this.
whoareyou.pubKey = some(toNode.pubkey) # TODO: Yeah, rather ugly this.
doAssert(toNode.address.isSome())
let (data, _) = encodePacket(d.rng[], d.codec, toNode.id, toNode.address.get(),
pr.message, challenge = whoareyou)
@ -694,10 +699,10 @@ proc resolve*(d: Protocol, id: NodeId): Future[Option[Node]]
{.async, raises: [Exception, Defect].} =
## Resolve a `Node` based on provided `NodeId`.
##
## This will first look in the own DHT. If the node is known, it will try to
## contact if for newer information. If node is not known or it does not
## reply, a lookup is done to see if it can find a (newer) record of the node
## on the network.
## This will first look in the own routing table. If the node is known, it
## will try to contact if for newer information. If node is not known or it
## does not reply, a lookup is done to see if it can find a (newer) record of
## the node on the network.
let node = d.getNode(id)
if node.isSome():
@ -710,8 +715,6 @@ proc resolve*(d: Protocol, id: NodeId): Future[Option[Node]]
let discovered = await d.lookup(id)
for n in discovered:
if n.id == id:
# TODO: Not getting any new seqNum here as in a lookup nodes in table with
# new seqNum don't get replaced.
if node.isSome() and node.get().record.seqNum >= n.record.seqNum:
return node
else:
@ -725,8 +728,10 @@ proc revalidateNode*(d: Protocol, n: Node)
if pong.isOK():
if pong.get().enrSeq > n.record.seqNum:
# TODO: Request new ENR
discard
# Request new ENR
let nodes = await d.findNode(n, 0)
if nodes.isOk() and nodes[].len > 0:
discard d.addNode(nodes[][0])
proc revalidateLoop(d: Protocol) {.async, raises: [Exception, Defect].} =
# TODO: General Exception raised.

6
eth/p2p/discoveryv5/routing_table.nim
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@ -110,6 +110,9 @@ proc add(k: KBucket, n: Node): Node =
k.lastUpdated = epochTime()
let nodeIdx = k.nodes.find(n)
if nodeIdx != -1:
if k.nodes[nodeIdx].record.seqNum < n.record.seqNum:
# In case of a newer record, it gets replaced.
k.nodes[nodeIdx].record = n.record
return nil
elif k.len < BUCKET_SIZE:
k.nodes.add(n)
@ -126,6 +129,9 @@ proc addReplacement(k: KBucket, n: Node) =
## to the tail.
let nodeIdx = k.replacementCache.find(n)
if nodeIdx != -1:
if k.replacementCache[nodeIdx].record.seqNum <= n.record.seqNum:
# In case the record sequence number is higher or the same, the node gets
# moved to the tail.
k.replacementCache.delete(nodeIdx)
k.replacementCache.add(n)
else:

22
eth/p2p/discoveryv5/types.nim
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@ -23,7 +23,7 @@ type
authTag*: AuthTag
idNonce*: IdNonce
recordSeq*: uint64
pubKey* {.rlpIgnore.}: PublicKey
pubKey* {.rlpIgnore.}: Option[PublicKey]
Whoareyou* = ref WhoareyouObj
@ -107,3 +107,23 @@ proc hash*(address: Address): Hash {.inline.} =
proc hash*(key: HandshakeKey): Hash =
result = key.nodeId.hash !& key.address.hash
result = !$result
proc read*(rlp: var Rlp, O: type Option[Record]): O
{.raises: [ValueError, RlpError, Defect].} =
mixin read
if not rlp.isList:
raise newException(
ValueError, "Could not deserialize optional ENR, expected list")
# The discovery specification states that in case no ENR is send in the
# handshake, an empty rlp list instead should be send.
if rlp.listLen == 0:
none(Record)
else:
some(read(rlp, Record))
proc append*(writer: var RlpWriter, value: Option[Record]) =
if value.isSome:
writer.append value.get
else:
writer.startList(0)

92
tests/p2p/test_discoveryv5.nim
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@ -313,8 +313,8 @@ procSuite "Discovery v5 Tests":
var targetSeqNum = targetNode.localNode.record.seqNum
# Populate DHT with target through a ping. Next, close target and see
# if resolve works (only local lookup)
# Populate routing table with target through a ping. Next, close target and
# see if resolve works (only local getNode).
block:
let pong = await targetNode.ping(mainNode.localNode)
check pong.isOk()
@ -324,13 +324,14 @@ procSuite "Discovery v5 Tests":
n.isSome()
n.get().id == targetId
n.get().record.seqNum == targetSeqNum
# Node will be removed because of failed findNode request.
# Bring target back online, update seqNum in ENR, check if we get the
# updated ENR.
block:
targetNode.open()
# ping to node again to add as it was removed after failed findNode in
# resolve in previous test block
# resolve in previous test block.
let pong = await targetNode.ping(mainNode.localNode)
check pong.isOk()
@ -339,13 +340,22 @@ procSuite "Discovery v5 Tests":
let update = targetNode.updateRecord({"addsomefield": @[byte 1]})
check update.isOk()
let n = await mainNode.resolve(targetId)
var n = mainNode.getNode(targetId)
check:
n.isSome()
n.get().id == targetId
n.get().record.seqNum == targetSeqNum - 1
n = await mainNode.resolve(targetId)
check:
n.isSome()
n.get().id == targetId
n.get().record.seqNum == targetSeqNum
# Update seqNum in ENR again, ping lookupNode to be added in DHT,
# Add the updated version
check mainNode.addNode(n.get())
# Update seqNum in ENR again, ping lookupNode to be added in routing table,
# close targetNode, resolve should lookup, check if we get updated ENR.
block:
targetSeqNum.inc()
@ -357,11 +367,8 @@ procSuite "Discovery v5 Tests":
# findNode request
check (await lookupNode.ping(targetNode.localNode)).isOk()
await targetNode.closeWait()
# TODO: This step should eventually not be needed and ENRs with new seqNum
# should just get updated in the lookup.
await mainNode.revalidateNode(targetNode.localNode)
check mainNode.addNode(lookupNode.localNode)
check mainNode.addNode(lookupNode.localNode.record)
let n = await mainNode.resolve(targetId)
check:
n.isSome()
@ -419,6 +426,73 @@ procSuite "Discovery v5 Tests":
db, ip, port, port, rng = rng,
previousRecord = some(updatesNode.getRecord()))
asyncTest "Update node record with revalidate":
let
mainNode =
initDiscoveryNode(rng, PrivateKey.random(rng[]), localAddress(20301))
testNode =
initDiscoveryNode(rng, PrivateKey.random(rng[]), localAddress(20302))
testNodeId = testNode.localNode.id
check:
# Get node with current ENR in routing table.
# Handshake will get done here.
(await testNode.ping(mainNode.localNode)).isOk()
testNode.updateRecord({"test" : @[byte 1]}).isOk()
testNode.localNode.record.seqNum == 2
# Get the node from routing table, seqNum should still be 1.
var n = mainNode.getNode(testNodeId)
check:
n.isSome()
n.get.record.seqNum == 1
# This should not do a handshake and thus the new ENR must come from the
# findNode(0)
await mainNode.revalidateNode(n.get)
# Get the node from routing table, and check if record got updated.
n = mainNode.getNode(testNodeId)
check:
n.isSome()
n.get.record.seqNum == 2
await mainNode.closeWait()
await testNode.closeWait()
asyncTest "Update node record with handshake":
let
mainNode =
initDiscoveryNode(rng, PrivateKey.random(rng[]), localAddress(20301))
testNode =
initDiscoveryNode(rng, PrivateKey.random(rng[]), localAddress(20302))
testNodeId = testNode.localNode.id
# Add the node (from the record, so new node!) so no handshake is done yet.
check: mainNode.addNode(testNode.localNode.record)
check:
testNode.updateRecord({"test" : @[byte 1]}).isOk()
testNode.localNode.record.seqNum == 2
# Get the node from routing table, seqNum should still be 1.
var n = mainNode.getNode(testNodeId)
check:
n.isSome()
n.get.record.seqNum == 1
# This should do a handshake and update the ENR through that.
check (await testNode.ping(mainNode.localNode)).isOk()
# Get the node from routing table, and check if record got updated.
n = mainNode.getNode(testNodeId)
check:
n.isSome()
n.get.record.seqNum == 2
await mainNode.closeWait()
await testNode.closeWait()
test "Verify records of nodes message":
let
port = Port(9000)

16
tests/p2p/test_discv5_encoding.nim
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@ -241,10 +241,22 @@ suite "Discovery v5 Additional":
nodeId = pubKey.toNodeId()
idNonce = hexToByteArray[idNonceSize](
"0xa77e3aa0c144ae7c0a3af73692b7d6e5b7a2fdc0eda16e8d5e6cb0d08e88dd04")
whoareyou = Whoareyou(idNonce: idNonce, recordSeq: 0, pubKey: pubKey)
c = Codec(localNode: node, privKey: privKey)
let (auth, _) = encodeAuthHeader(rng[], c, nodeId, nonce, whoareyou)
block: # With ENR
let
whoareyou = Whoareyou(idNonce: idNonce, recordSeq: 0, pubKey: some(pubKey))
(auth, _) = encodeAuthHeader(rng[], c, nodeId, nonce, whoareyou)
var rlp = rlpFromBytes(auth)
let authHeader = rlp.read(AuthHeader)
var newNode: Node
let secrets = c.decodeAuthResp(privKey.toPublicKey().toNodeId(),
authHeader, whoareyou, newNode)
block: # Without ENR
let
whoareyou = Whoareyou(idNonce: idNonce, recordSeq: 1, pubKey: some(pubKey))
(auth, _) = encodeAuthHeader(rng[], c, nodeId, nonce, whoareyou)
var rlp = rlpFromBytes(auth)
let authHeader = rlp.read(AuthHeader)
var newNode: Node

10
tests/p2p/test_enr.nim
View File

@ -10,7 +10,7 @@ suite "ENR":
var pk = PrivateKey.fromHex(
"5d2908f3f09ea1ff2e327c3f623159639b00af406e9009de5fd4b910fc34049d")[]
var r = initRecord(123, pk, {"udp": 1234'u, "ip": [byte 5, 6, 7, 8]})[]
check($r == """(id: "v4", ip: 0x05060708, secp256k1: 0x02E51EFA66628CE09F689BC2B82F165A75A9DDECBB6A804BE15AC3FDF41F3B34E7, udp: 1234)""")
check($r == """(123, id: "v4", ip: 0x05060708, secp256k1: 0x02E51EFA66628CE09F689BC2B82F165A75A9DDECBB6A804BE15AC3FDF41F3B34E7, udp: 1234)""")
let uri = r.toURI()
var r2: Record
let sigValid = r2.fromURI(uri)
@ -22,7 +22,7 @@ suite "ENR":
var pk = PrivateKey.fromHex(
"5d2908f3f09ea1ff2e327c3f623159639b00af406e9009de5fd4b910fc34049d")[]
var r = initRecord(123, pk, {"udp": 1234'u, "ip": [byte 5, 6, 7, 8]})[]
check($r == """(id: "v4", ip: 0x05060708, secp256k1: 0x02E51EFA66628CE09F689BC2B82F165A75A9DDECBB6A804BE15AC3FDF41F3B34E7, udp: 1234)""")
check($r == """(123, id: "v4", ip: 0x05060708, secp256k1: 0x02E51EFA66628CE09F689BC2B82F165A75A9DDECBB6A804BE15AC3FDF41F3B34E7, udp: 1234)""")
let encoded = rlp.encode(r)
let decoded = rlp.decode(encoded, enr.Record)
check($decoded == $r)
@ -44,7 +44,7 @@ suite "ENR":
var r: Record
let sigValid = r.fromBase64("-IS4QHCYrYZbAKWCBRlAy5zzaDZXJBGkcnh4MHcBFZntXNFrdvJjX04jRzjzCBOonrkTfj499SZuOh8R33Ls8RRcy5wBgmlkgnY0gmlwhH8AAAGJc2VjcDI1NmsxoQPKY0yuDUmstAHYpMa2_oxVtw0RW_QAdpzBQA8yWM0xOIN1ZHCCdl8")
check(sigValid)
check($r == """(id: "v4", ip: 0x7F000001, secp256k1: 0x03CA634CAE0D49ACB401D8A4C6B6FE8C55B70D115BF400769CC1400F3258CD3138, udp: 30303)""")
check($r == """(1, id: "v4", ip: 0x7F000001, secp256k1: 0x03CA634CAE0D49ACB401D8A4C6B6FE8C55B70D115BF400769CC1400F3258CD3138, udp: 30303)""")
test "Bad base64":
var r: Record
@ -146,13 +146,13 @@ suite "ENR":
"z": [byte 0],
"123": "abc",
"a12": 1'u})[]
check $r == """(123: "abc", a12: 1, abc: 1234, id: "v4", secp256k1: 0x02E51EFA66628CE09F689BC2B82F165A75A9DDECBB6A804BE15AC3FDF41F3B34E7, z: 0x00)"""
check $r == """(123, 123: "abc", a12: 1, abc: 1234, id: "v4", secp256k1: 0x02E51EFA66628CE09F689BC2B82F165A75A9DDECBB6A804BE15AC3FDF41F3B34E7, z: 0x00)"""
let newField = toFieldPair("test", 123'u)
let newField2 = toFieldPair("zzz", 123'u)
let updated = r.update(pk, [newField, newField2])
check updated.isOk()
check $r == """(123: "abc", a12: 1, abc: 1234, id: "v4", secp256k1: 0x02E51EFA66628CE09F689BC2B82F165A75A9DDECBB6A804BE15AC3FDF41F3B34E7, test: 123, z: 0x00, zzz: 123)"""
check $r == """(124, 123: "abc", a12: 1, abc: 1234, id: "v4", secp256k1: 0x02E51EFA66628CE09F689BC2B82F165A75A9DDECBB6A804BE15AC3FDF41F3B34E7, test: 123, z: 0x00, zzz: 123)"""
test "ENR update size too big":
let pk = PrivateKey.fromHex(