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undernet_totp.py
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undernet_totp.py
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# -*- coding: utf-8 -*-
#
# Copyright (C) 2013 Stefan Wold <[email protected]>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# (This script requires WeeChat 0.4.2 or higher).
#
# WeeChat script for UnderNET's X OTP (OATH-TOTP) authentication
#
# The script will generate an OTP and automatically append it when it
# notices /msg [email protected] login <username> <password> command.
# This allows OTP login when using irc.server.*.command to automatically
# sign in to the X service when connecting to an undernet server.
#
# Source available on GitHUB: https://github.com/Ratler/ratlers-weechat-script
#
# Configuration:
# /set plugins.var.python.undernet-totp.otp_server_names "<server1>,<server2>,..."
# Set servers for which to automatically enable OTP login
#
# Commands:
# /uotp <server>
# Generate an OTP for supplied server, output in core buffer.
#
SCRIPT_NAME = "undernet_totp"
SCRIPT_AUTHOR = "Stefan Wold <[email protected]>"
SCRIPT_VERSION = "0.3"
SCRIPT_LICENSE = "GPL3"
SCRIPT_DESC = "UnderNET X OTP (OATH-TOTP) authentication"
SCRIPT_COMMAND = "uotp"
HOOKS = {}
SETTINGS = {
"otp_server_names": ("", "List of undernet server for which to enable OTP, use comma as separator"),
"debug" : ("off", "Debug output"),
}
import_ok = True
try:
import weechat
except ImportError:
print "This script must be run under WeeChat."
import_ok = False
try:
import hmac
import re
from base64 import b32decode
from hashlib import sha1
from struct import pack, unpack
from time import time
from binascii import unhexlify
except ImportError as err:
print "Missing module(s) for %s: %s" % (SCRIPT_NAME, err)
import_ok = False
def print_debug(message):
if weechat.config_get_plugin('debug') == 'on':
weechat.prnt("", "%s DEBUG: %s" % (SCRIPT_NAME, message))
def unhook(hook):
global HOOKS
if hook in HOOKS:
print_debug('Unhooking %s' % hook)
weechat.unhook(HOOKS[hook])
del HOOKS[hook]
def unhook_all(server):
for hook in [server+'.notice', server+'.modifier', server+'.modifier2']:
unhook(hook)
def hook_all(server):
global HOOKS
notice = server + '.notice'
modifier = server + '.modifier'
modifier2 = server + '.modifier2'
if notice not in HOOKS:
HOOKS[notice] = weechat.hook_signal("%s,irc_raw_in_notice" % server, "auth_success_cb", server)
if modifier not in HOOKS:
HOOKS[modifier] = weechat.hook_modifier("irc_out_privmsg", "totp_login_modifier_cb", server)
if modifier2 not in HOOKS:
HOOKS[modifier2] = weechat.hook_modifier("irc_out_pass", "totp_login_modifier_cb", server)
def totp_login_modifier_cb(data, modifier, server, cmd):
if server == data and server in enabled_servers():
if re.match(r'(?i)^PRIVMSG [email protected] :login .+ .+', cmd) or re.match(r'(?i)^PASS .*', cmd):
print_debug("totp_login_modifier_cb(%s)" % cmd)
otp = generate_totp(server)
if otp is not None:
cmd += " %s" % otp
return cmd
def auth_success_cb(server, signal, signal_data):
if signal_data.startswith(":[email protected] NOTICE"):
if re.match(r'^:[email protected] NOTICE .+ :AUTHENTICATION SUCCESSFUL', signal_data):
unhook_all(server)
return weechat.WEECHAT_RC_OK
def signal_cb(data, signal, server):
if server in enabled_servers():
print_debug('signal_cb(%s)' % signal)
if signal == 'irc_server_connecting':
hook_all(server)
elif signal == 'irc_server_disconnected':
unhook_all(server)
return weechat.WEECHAT_RC_OK
def get_otp_cb(data, buffer, server):
if server:
server = [server]
else:
server = enabled_servers()
for _server in server:
otp = generate_totp(_server)
if otp is not None:
weechat.prnt("", "%s OTP: %s" % (_server, otp))
return weechat.WEECHAT_RC_OK
def enabled_servers():
def server_exists(server):
print_debug('enabled_servers(%s)' % server)
if weechat.config_get('irc.server.%s.addresses' % server) is not '':
return True
return False
servers = weechat.config_get_plugin('otp_server_names')
return [s.strip() for s in servers.split(',') if server_exists(s.strip())]
def generate_totp(server, period=30):
print_debug('generate_totp(%s)' % server)
seed = weechat.string_eval_expression("${sec.data.%s_seed}" % server, {}, {}, {})
if seed is "":
weechat.prnt("", "No OATH-TOTP secret set, use: /secure set %s_seed <secret>" % server)
return None
if len(seed) == 40: # Assume hex format
seed = unhexlify(seed)
else:
seed = b32decode(seed.replace(" ", ""), True)
t = pack(">Q", int(time() / period))
_hmac = hmac.new(seed, t, sha1).digest()
o = ord(_hmac[19]) & 15
otp = (unpack(">I", _hmac[o:o+4])[0] & 0x7fffffff) % 1000000
return '%06d' % otp
if __name__ == "__main__" and import_ok:
if weechat.register(SCRIPT_NAME, SCRIPT_AUTHOR, SCRIPT_VERSION, SCRIPT_LICENSE,
SCRIPT_DESC, "", ""):
version = weechat.info_get("version_number", "") or 0
if int(version) < 0x00040200:
weechat.prnt("", "%s requires WeeChat >= 0.4.2 for secure_data support." % SCRIPT_NAME)
weechat.command("", "/wait 1ms /python unload %s" % SCRIPT_NAME)
weechat.hook_command(SCRIPT_COMMAND, "Generate OTP for supplied server", "[server]", "", "%(irc_servers)", "get_otp_cb", "")
weechat.hook_signal("irc_server_connecting", "signal_cb", "")
weechat.hook_signal("irc_server_disconnected", "signal_cb", "")
for option, default_value in SETTINGS.items():
if weechat.config_get_plugin(option) == "":
weechat.config_set_plugin(option, default_value[0])
weechat.config_set_desc_plugin(option, '%s (default: %s)' % (default_value[1], default_value[0]))
# For now we enable the hooks until it's possible to force script plugins to
# load before the irc plugin on weechat startup, otherwise the irc_server_connecting signal
# get missed.
for _server in enabled_servers():
hook_all(_server)