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networks.remote: add recursion checks to prevent bad queries from crashing the server

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For example, 'remote net1 remote net2 echo hi' was problematic if the source network was 'net1'.

It's a good thing this command is restricted by default...
This commit is contained in:
James Lu 2017-03-31 16:40:26 -07:00
parent 9d9b01839c
commit 0749a42ef6
1 changed files with 14 additions and 0 deletions
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14
plugins/networks.py
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@ -1,11 +1,14 @@
"""Networks plugin - allows you to manipulate connections to various configured networks."""
import importlib
import types
import threading
from pylinkirc import utils, world, conf, classes
from pylinkirc.log import log
from pylinkirc.coremods import control, permissions
REMOTE_IN_USE = threading.Event()
@utils.add_cmd
def disconnect(irc, source, args):
"""<network>
@ -65,20 +68,30 @@ def remote(irc, source, args):
args = remote_parser.parse_args(args)
netname = args.network
# XXX: things like 'remote network1 remote network2 echo hi' will crash PyLink if the source network is network1...
global REMOTE_IN_USE
if REMOTE_IN_USE.is_set():
irc.error("The 'remote' command can not be nested.")
return
REMOTE_IN_USE.set()
if netname == irc.name:
# This would actually throw _remote_reply() into a loop, so check for it here...
# XXX: properly fix this.
irc.error("Cannot remote-send a command to the local network; use a normal command!")
REMOTE_IN_USE.clear()
return
try:
remoteirc = world.networkobjects[netname]
except KeyError: # Unknown network.
irc.error('No such network "%s" (case sensitive).' % netname)
REMOTE_IN_USE.clear()
return
if args.service not in world.services:
irc.error('Unknown service %r.' % args.service)
REMOTE_IN_USE.clear()
return
# Force remoteirc.called_in to something private in order to prevent
@ -118,6 +131,7 @@ def remote(irc, source, args):
remoteirc._reply = old_reply
# Remove the identification override after we finish.
remoteirc.pseudoclient.account = ''
REMOTE_IN_USE.clear()
@utils.add_cmd
def reloadproto(irc, source, args):