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hooks.py
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hooks.py
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#!/usr/bin/env python
# coding: utf-8
#
# pppd hooks.
# Make sure pppd_pyhook.so is in the pppd plugins directory and deploy
# this file in /etc/ppp/ to enable it.
import syslog, sys, random,subprocess, re, os, time
import pyrad.packet
from pyrad.client import Client
from pyrad.dictionary import Dictionary
# What's this you ask?
# Well, our parent is reaping SIGCHLD, and if
# we use popen, we are screwed.
# And, keystone calls keyring, which calls uname.
import platform
def __syscmd_uname(option,default=""):
return "x86_64"
platform._syscmd_uname = __syscmd_uname
sys.argv[0] = "pptpd"
sys.path.insert(1, "/home/jump/openstack-proxy")
import find_ns
syslog.openlog(ident="pptp-hooks", logoption=syslog.LOG_PID, facility=syslog.LOG_LOCAL0)
def sendAcct(ns, user,ip,action):
server="172.16.3.1"
srv=Client(server=server,
secret="sandvine",
dict=Dictionary("/etc/ppp/aaa-dictionary"))
import types
def setRetryTimeout(self, r,t):
self.retries = r
self.timeout = t
srv.setRetryTimeout = types.MethodType( setRetryTimeout, srv)
srv.setRetryTimeout(1,0)
req=srv.CreateAcctPacket(User_Name=user)
# req["NAS-IP-Address"]="192.168.1.10"
# req["NAS-Port"]=0
# req["NAS-Identifier"]="trillian"
# req["Called-Station-Id"]="00-04-5F-00-0F-D1"
# req["Calling-Station-Id"]="00-01-24-80-B3-9C"
req["Framed-IP-Address"]=ip
req["User-Name"]=user
req["3GPP-IMSI"]=user
req["Calling-Station-Id"]=user
req["Acct-Status-Type"]=action
req["Acct-Session-Id"]="1"
req["3GPP-SGSN-Address"]=server
req["3GPP-GGSN-Address"]=server
req["Event-Timestamp"]=int(time.time())
pid = os.fork()
if (pid == 0):
try:
x = find_ns.NS(ns)
try:
srv.SendPacket(req)
except:
# We expect this error, since we get an ICMP port unreach
# back since no one is listening. But that's ok, we just
# tee the AAA anyway
pass
x.__del__()
except:
# Hmm, namespace is gone
pass
sys.exit(0)
os.waitpid(pid,0)
# parse_user parses the username string and returns user, tenant and instance.
# It supports two formats: user@tenant/instance and user@tenant|instance, the
# latter is to support Windows clients since "/" isn't a valid character
# for PPTP user names on that OS.
def parse_user(info):
parts = info.split("@")
assert len(parts) == 2, "malformed user name"
user = parts[0]
info = parts[1]
parts = info.split("/")
if len(parts) != 2:
parts = info.split("|") # Support for Windows clients.
if len(parts) != 2:
parts = info.split("+") # Support for Windows clients.
if len(parts) != 2:
parts = info.split("#") # Support for Windows clients.
assert len(parts) == 2, "malformed tenant/instance info"
tenant = parts[0]
instance = parts[1]
return user, tenant, instance
def get_secret_for_user(user, ipparam):
global ppp_user, namespace_id, vpn_ip
tenant = ""
instance = ""
syslog.syslog(syslog.LOG_INFO, "get_secret_for_user(%s,%s)" % (user,ipparam))
try:
# ppp_user is required for ip-up and ip-down.
ppp_user, tenant, instance = parse_user(user)
except AssertionError, e:
syslog.syslog(syslog.LOG_INFO, "wrong format for user '%s': %s" % user, e)
return str(random.random())
syslog.syslog(syslog.LOG_INFO, "connecting user %s with ipparam %s" % (user, ipparam))
try:
args = find_ns.do_args()
vpn_ip, ns, h = find_ns.find_host(args.user, tenant, args.password, instance, args.auth_url)
#syslog.syslog(syslog.LOG_INFO, "namespace for %s %s is %s" % (tenant, instance, ns))
assert ns != "", "empty namespace"
namespace_id = ns
except:
syslog.syslog(syslog.LOG_INFO, "could not find namespace for %s %s" % (tenant, instance))
return str(random.random())
return "cl0ud"
def allowed_address_hook(ip):
syslog.syslog(syslog.LOG_INFO, "allowed_address_hook %s" % ip)
return True
def chap_check_hook():
syslog.syslog(syslog.LOG_INFO, "chap_check_hook")
return True
def ip_up_notifier(ifname, localip, remoteip):
global rad_session
global ppp_table
global ppp_user
global ppp_addr
global ppp_ifname
global namespace_id
global vpn_ip
ppp = 0
try:
ppp = int(ifname[3:])
except Exception, e:
syslog.syslog(syslog.LOG_INFO, "failed to parse pppN from: %s" % ifname)
return
# used by ip-down
ppp_table = 1000 + ppp
ppp_addr = remoteip
ppp_ifname = ifname
ns = "qrouter-%s" % namespace_id
v0 = "veth-%s-ext" % ifname
v0_ip = "10.1.%u.1" % ppp
v1 = "veth-%s-int" % ifname
v1_ip = "10.1.%u.2" % ppp
p = subprocess.Popen(["/sbin/ifconfig", ifname], shell=False, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
ifc = p.communicate()[0]
peer = ""
try:
peer = re.match(r".*P-t-P:([^\s]*)", ifc, re.MULTILINE|re.DOTALL).groups()[0]
except Exception, e:
syslog.syslog(syslog.LOG_ERR, "failed to get %s address: %s" % (ifname, e))
return
# the initial del handle the case where we crashed out somehow w/o cleanup
f = "/tmp/%s-up.sh" % ifname
with open(f, "w") as fd:
fd.write("#!/bin/bash\n")
fd.write("set -x\n")
fd.write("/sbin/ip rule ls\n")
fd.write("/sbin/ip addr\n")
fd.write("/sbin/ifconfig %s mtu 1396\n" % ppp_ifname)
fd.write("/sbin/ip rule del dev %s\n" % ppp_ifname)
fd.write("/sbin/ip link del %s\n" % v0)
fd.write("/sbin/ip netns exec %s ip rule del dev %s\n" % (ns, v1))
fd.write("/sbin/ip netns exec %s /sbin/ip link del %s\n" % (v0,v1))
fd.write("/sbin/ip link add %s type veth peer name %s\n" % (v0, v1))
fd.write("/sbin/ifconfig %s mtu 1396\n" % v0)
fd.write("/sbin/ifconfig %s mtu 1396\n" % v1)
fd.write("/sbin/ip link set %s netns %s\n" % (v1, ns))
fd.write("/sbin/ifconfig %s inet %s/30\n" % (v0, v0_ip))
fd.write("/sbin/ip rule add dev %s table %s\n" % (ifname, ppp_table))
fd.write("/sbin/ip route add default via %s table %d\n" % (v1_ip, ppp_table))
fd.write("/sbin/ip netns exec %s route add 172.16.3.1/32 gw %s\n" % (ns, vpn_ip))
fd.write("/sbin/ip netns exec %s ifconfig %s inet %s/30\n" % (ns, v1, v1_ip))
fd.write("/sbin/ip netns exec %s ip route add %s via %s\n" % (ns, peer, v0_ip))
fd.write("/sbin/ip netns exec %s ip rule add dev %s table %d\n" % (ns, v1, ppp_table))
fd.write("/sbin/ip netns exec %s ip route add default via %s table %d\n" % (ns, vpn_ip, ppp_table))
os.system("bash %s > %s.log 2>&1" % (f,f))
# os.unlink(f)
sendAcct(namespace_id, ppp_user,remoteip,"Start")
def ip_down_notifier(arg):
global ppp_table
global ppp_user
global ppp_addr
global ppp_ifname
global namespace_id
global vpn_ip
ppp = int(ppp_ifname[3:])
ns = "qrouter-%s" % namespace_id
v0_ip = "10.1.%u.1" % ppp
v1 = "veth-%s-int" % ppp_ifname
sendAcct(namespace_id, ppp_user,ppp_addr,"Stop")
f = "/tmp/%s-down.sh" % ppp_ifname
with open(f, "w") as fd:
fd.write("#!/bin/bash\n")
fd.write("set -x\n")
fd.write("/sbin/ip rule ls\n")
fd.write("/sbin/ip addr\n")
fd.write("/sbin/ip rule del dev %s\n" % ppp_ifname)
fd.write("/sbin/ip netns exec %s ip rule del dev %s\n" % (ns, v1))
fd.write("/sbin/ip link del veth-%s-ext\n" % ppp_ifname)
fd.write("/sbin/ip netns exec %s ip route flush table %d\n" % (ns, ppp_table))
os.system("bash %s > %s.log 2>&1" % (f,f))
# os.unlink(f)
def auth_up_notifier(arg):
syslog.syslog(syslog.LOG_INFO, "auth_up_notifier %s" % arg)
pass
def link_down_notifier(arg):
syslog.syslog(syslog.LOG_INFO, "auth_down_notifier %s" % arg)
pass