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proto.nim
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proto.nim
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# Copyright (c) 2022 One Part Rain, LLC. All rights reserved.
#
# This work is licensed under the terms of the MIT license.
# For a copy, see LICENSE.md in this repository.
import std/base64
import std/hashes
import std/logging
import std/options
import std/sets; export sets
import std/strformat
import std/strutils
import std/tables
import ./common
import libsodium/sodium
import ndb/sqlite
template TODO*(msg: string) =
when defined(release):
{.error: msg .}
type
PublicKey* = distinct string
SecretKey* = distinct string
KeyPair* = tuple
pk: PublicKey
sk: SecretKey
## Relay event types
EventKind* = enum
Who = "?"
Authenticated = "+"
Connected = "c"
Disconnected = "x"
Data = "d"
Entered = ">"
Exited = "^"
ErrorEvent = "E"
## RelayEvent error types
ErrorCode* = enum
Generic = 0
DestNotPresent
## Relay events -- server to client message
RelayEvent* = object
case kind*: EventKind
of Who:
who_challenge*: string
of Authenticated:
discard
of Connected:
conn_pubkey*: PublicKey
of Disconnected:
dcon_pubkey*: PublicKey
of Data:
data*: string
sender_pubkey*: PublicKey
of Entered:
entered_pubkey*: PublicKey
of Exited:
exited_pubkey*: PublicKey
of ErrorEvent:
err_code*: ErrorCode
err_message*: string
## Relay command types
CommandKind* = enum
Iam = "i"
Connect = "c"
Disconnect = "x"
SendData = "d"
## Relay command - client to server message
RelayCommand* = object
case kind*: CommandKind
of Iam:
iam_signature*: string
iam_pubkey*: PublicKey
of Connect:
conn_pubkey*: PublicKey
of Disconnect:
dcon_pubkey*: PublicKey
of SendData:
send_data*: string
dest_pubkey*: PublicKey
RelayConnection*[T] = ref object
challenge: string
pubkey*: PublicKey
channel*: string
peer_connections: HashSet[PublicKey]
sender*: T
Relay*[T] = ref object
conns: TableRef[PublicKey, RelayConnection[T]]
channels: TableRef[string, HashSet[PublicKey]]
conn_requests: TableRef[PublicKey, HashSet[PublicKey]]
db: DbConn
RelayErr* = object of CatchableError
proc newRelay*[T](): Relay[T] =
new(result)
result.conns = newTable[PublicKey, RelayConnection[T]]()
result.channels = newTable[string, HashSet[PublicKey]]()
result.conn_requests = newTable[PublicKey, HashSet[PublicKey]]()
proc `$`*(a: PublicKey): string =
a.string.encode()
proc abbr*(s: string, size = 6): string =
if s.len > size:
result.add s.substr(0, size) & "..."
else:
result.add(s)
proc abbr*(a: PublicKey): string =
a.string.encode().abbr
proc `$`*(conn: RelayConnection): string =
result.add "[RConn "
if conn.pubkey.string == "":
result.add "----------"
else:
result.add conn.pubkey.abbr
result.add "]"
proc `==`*(a, b: PublicKey): bool {.borrow.}
proc hash*(p: PublicKey): Hash {.borrow.}
proc `==`*(a, b: RelayEvent): bool =
if a.kind != b.kind:
return false
else:
case a.kind
of Who:
return a.who_challenge == b.who_challenge
of Authenticated:
return true
of Connected:
return a.conn_pubkey == b.conn_pubkey
of Disconnected:
return a.dcon_pubkey == b.dcon_pubkey
of Data:
return a.sender_pubkey == b.sender_pubkey and a.data == b.data
of Entered:
return a.entered_pubkey == b.entered_pubkey
of Exited:
return a.exited_pubkey == b.exited_pubkey
of ErrorEvent:
return a.err_message == b.err_message
proc `==`*(a, b: RelayCommand): bool =
if a.kind != b.kind:
return false
else:
case a.kind:
of Iam:
return a.iam_signature == b.iam_signature and a.iam_pubkey == b.iam_pubkey
of Connect:
return a.conn_pubkey == b.conn_pubkey
of Disconnect:
return a.dcon_pubkey == b.dcon_pubkey
of SendData:
return a.send_data == b.send_data and a.dest_pubkey == b.dest_pubkey
proc `$`*(ev: RelayEvent): string =
result.add "("
case ev.kind
of Who:
result.add "Who challenge=" & ev.who_challenge.encode().abbr
of Authenticated:
result.add "Authenticated"
of Connected:
result.add "Connected " & ev.conn_pubkey.abbr
of Disconnected:
result.add "Disconnected " & ev.dcon_pubkey.abbr
of Data:
result.add "Data " & ev.sender_pubkey.abbr & " data=" & $ev.data.len
of Entered:
result.add "Entered " & ev.entered_pubkey.abbr
of Exited:
result.add "Exited " & ev.exited_pubkey.abbr
of ErrorEvent:
result.add "Error " & ev.err_message
result.add ")"
template dbg*(ev: RelayEvent): string = $ev
proc `$`*(cmd: RelayCommand): string =
result.add "("
case cmd.kind
of Iam:
result.add &"Iam {cmd.iam_pubkey.abbr} sig={cmd.iam_signature.encode.abbr}"
of Connect:
result.add &"Connect {cmd.conn_pubkey.abbr}"
of Disconnect:
result.add &"Disconnect {cmd.dcon_pubkey.abbr}"
of SendData:
result.add &"SendData {cmd.dest_pubkey.abbr} data={cmd.send_data.len}"
result.add ")"
template dbg*(cmd: RelayCommand): string = $cmd
when defined(testmode):
# proc dump*(relay: Relay): string =
# for row in relay.db.getAllRows(sql"SELECT * FROM clients"):
# result.add $row & "\l"
# for row in relay.db.getAllRows(sql"SELECT * FROM pending_conns"):
# result.add $row & "\l"
proc testmode_conns*[T](relay: Relay[T]): TableRef[PublicKey, RelayConnection[T]] =
relay.conns
proc testmode_conns*(conn: RelayConnection): HashSet[PublicKey] =
conn.peer_connections
proc newRelayConnection*[T](sender: T): RelayConnection[T] =
new(result)
result.sender = sender
result.peer_connections = initHashSet[PublicKey]()
template sendEvent(conn: RelayConnection, ev: RelayEvent) =
case ev.kind
of Data:
when relayverbose:
debug $conn & "< " & ev.dbg
else:
discard
else:
debug $conn & "< " & ev.dbg
conn.sender.sendEvent(ev)
template sendError(conn: RelayConnection, message: string) =
debug $conn & "< error: " & message
conn.sender.sendEvent(RelayEvent(
kind: ErrorEvent,
err_message: message,
))
proc initAuth*[T](relay: var Relay[T], client: T, channel = ""): RelayConnection[T] =
## Ask the client to authenticate itself. After it succeeds, it will
## be added as a connected client.
## If channel is provided, this is the channel to which this client
## will be subscribed for Entered/Exited events.
var conn = newRelayConnection[T](client)
conn.challenge = randombytes(32)
conn.channel = channel
conn.sendEvent(RelayEvent(
kind: Who,
who_challenge: conn.challenge,
))
return conn
proc connectPair[T](a, b: var RelayConnection[T]) =
## Connect two clients together
a.peer_connections.incl(b.pubkey)
b.peer_connections.incl(a.pubkey)
a.sendEvent(RelayEvent(kind: Connected, conn_pubkey: b.pubkey))
b.sendEvent(RelayEvent(kind: Connected, conn_pubkey: a.pubkey))
proc addConnRequest(relay: var Relay, alice_pubkey: PublicKey, bob_pubkey: PublicKey) =
## Add or fulfil a connection request from alice to bob
var alice = relay.conns[alice_pubkey]
relay.conn_requests.mgetOrPut(alice_pubkey, initHashSet[PublicKey]()).incl(bob_pubkey)
if bob_pubkey in alice.peer_connections:
# They're already connected
return
var bob_requests = relay.conn_requests.getOrDefault(bob_pubkey, initHashSet[PublicKey]())
if alice_pubkey in bob_requests:
# They both want to connect!
var bob = relay.conns[bob_pubkey]
connectPair(alice, bob)
proc removeConnRequest(relay: var Relay, alice_pubkey: PublicKey, bob_pubkey: PublicKey) =
## Remove a connection request from alice to bob
relay.conn_requests.mgetOrPut(alice_pubkey, initHashSet[PublicKey]()).excl(bob_pubkey)
proc removeConnection*[T](relay: var Relay[T], conn: RelayConnection[T]) =
## Remove a conn from the relay if it exists.
if conn.pubkey in relay.conn_requests:
relay.conn_requests.del(conn.pubkey)
# disconnect all peer connections
var commands: seq[RelayCommand]
for other_pubkey in conn.peer_connections:
commands.add(RelayCommand(
kind: Disconnect,
dcon_pubkey: other_pubkey,
))
for command in commands:
relay.handleCommand(conn, command)
# notify the channel (if any)
if conn.channel != "":
relay.channels.mgetOrPut(conn.channel, initHashSet[PublicKey]()).excl(conn.pubkey)
for other in relay.channels[conn.channel].items:
if other in relay.conns:
relay.conns[other].sendEvent(RelayEvent(
kind: Exited,
exited_pubkey: conn.pubkey,
))
# remove it from the registry
if conn.pubkey in relay.conns:
relay.conns.del(conn.pubkey)
debug &"{conn} gone"
proc handleCommand*[T](relay: var Relay[T], conn: RelayConnection[T], command: RelayCommand) =
case command.kind
of SendData:
when defined(verbose):
debug &"{conn} > {command.dbg}"
else:
discard
else:
debug &"{conn} > {command.dbg}"
case command.kind
of Iam:
if conn.challenge == "":
conn.sendError "Authentication cannot proceed. Reconnect and try again."
try:
crypto_sign_verify_detached(command.iam_pubkey.string, conn.challenge, command.iam_signature)
except:
conn.challenge = "" # disable authentication
conn.sendError "Invalid signature"
return
conn.pubkey = command.iam_pubkey
if conn.pubkey in relay.conns:
# this pubkey is already connected; boot the old conn
relay.removeConnection(relay.conns[conn.pubkey])
relay.conns[conn.pubkey] = conn
conn.sendEvent(RelayEvent(
kind: Authenticated,
))
if conn.channel != "":
relay.channels.mgetOrPut(conn.channel, initHashSet[PublicKey]()).incl(conn.pubkey)
for other in relay.channels[conn.channel].items:
if other != conn.pubkey:
conn.sendEvent(RelayEvent(
kind: Entered,
entered_pubkey: other,
))
if other in relay.conns:
relay.conns[other].sendEvent(RelayEvent(
kind: Entered,
entered_pubkey: conn.pubkey,
))
of Connect:
if conn.pubkey.string == "":
conn.sendError "Connection forbidden"
elif command.conn_pubkey.string == conn.pubkey.string:
conn.sendError "Can't connect to self"
else:
relay.addConnRequest(conn.pubkey, command.conn_pubkey)
of Disconnect:
relay.removeConnRequest(conn.pubkey, command.dcon_pubkey)
if command.dcon_pubkey in conn.peer_connections:
if command.dcon_pubkey in relay.conns:
var other = relay.conns[command.dcon_pubkey]
# disassociate
other.peer_connections.excl(conn.pubkey)
conn.peer_connections.excl(other.pubkey)
# notify
conn.sendEvent(RelayEvent(
kind: Disconnected,
dcon_pubkey: other.pubkey,
))
other.sendEvent(RelayEvent(
kind: Disconnected,
dcon_pubkey: conn.pubkey,
))
of SendData:
if conn.pubkey.string == "":
conn.sendError "Sending forbidden"
elif command.dest_pubkey notin conn.peer_connections:
conn.sendError "No such connection"
else:
if command.dest_pubkey notin relay.conns:
conn.sendEvent(RelayEvent(
kind: ErrorEvent,
err_message: "Other side disconnected",
))
else:
let remote = relay.conns[command.dest_pubkey]
remote.sendEvent(RelayEvent(
kind: Data,
sender_pubkey: conn.pubkey,
data: command.send_data,
))
#------------------------------------------------------------
# utilities
#------------------------------------------------------------
proc genkeys*(): KeyPair =
let (pk, sk) = crypto_sign_keypair()
result = (pk.PublicKey, sk.SecretKey)
proc sign*(key: SecretKey, message: string): string =
## Sign a message with the given secret key
result = crypto_sign_detached(key.string, message)