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f5vpn-login.py
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f5vpn-login.py
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#!/usr/bin/env python
"""Log in to a F5 Firepass SSL VPN from a command-line, without using F5's
browser-plugin and associated junk. Yay.
Works with OSX and linux, at the moment.
Copyright 2006-2010, James Y Knight <[email protected]>
2010-08-30
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/>.
"""
CONFIG_FILE = "~/.f5vpn-login.conf"
KEEPALIVE_TIMEOUT = 60 * 5
CERTIFICATE_FILE_LOCATIONS = [
'/etc/ssl/certs/ca-certificates.crt', # Debian/Ubuntu/Gentoo
'/etc/pki/tls/certs/ca-bundle.crt', # New redhat
'/usr/share/ssl/certs/ca-bundle.crt', # Old redhat
'/etc/ssl/cert.pem', # FreeBSD
'/etc/ssl/ca-bundle.pem', # openSUSE
# Your OS goes here? Email me if you know of more places to look...
# Other paths I've seen mentioned on teh internets, what the heck, can't hurt
'/etc/certs/ca-bundle.crt',
'/usr/local/ssl/certs/ca-bundle.crt',
'/etc/apache/ssl.crt/ca-bundle.crt',
'/usr/share/curl/curl-ca-bundle.crt',
'/usr/lib/ssl/cert.pem',
]
import socket, re, sys, os, time, fcntl, select, errno, signal
import getpass, getopt, types
from urllib import quote_plus
try:
import socks
except ImportError:
socks = None
# File that contains certificates to use
ssl_cert_path = None
# File that contains client certificate
ssl_client_certfile = None
# File that contains client private key
ssl_client_keyfile = None
proxy_addr = None
try:
# The ssl module is New in python 2.6, and required for cert validation.
import ssl as sslmodule
def sslwrap(hostname, s):
try:
params = {}
if ssl_client_certfile is not None:
params["certfile"] = ssl_client_certfile
if ssl_client_keyfile is not None:
params["keyfile"] = ssl_client_keyfile
if ssl_cert_path is not None:
ssl_sock = sslmodule.wrap_socket(s, cert_reqs=sslmodule.CERT_REQUIRED,
ca_certs=ssl_cert_path, **params)
ssl_sock.do_handshake()
verify_certificate_host(ssl_sock.getpeercert(),
ssl_sock.getpeername()[0], hostname)
else:
ssl_sock = sslmodule.wrap_socket(s, **params)
ssl_sock.do_handshake()
except sslmodule.SSLError, e:
if 'SSL3_GET_SERVER_CERTIFICATE:certificate verify failed' in str(e):
raise MyException("Couldn't validate server certificate.\nAre you being MITM'd? If not, try --dont-check-certificates\n" + str(e))
else:
raise
return ssl_sock
except ImportError:
sslmodule = None
def sslwrap(hostname, s):
return socket.ssl(s)
class MyException(SystemExit):
pass
def set_non_blocking(fd):
flags = fcntl.fcntl(fd, fcntl.F_GETFL)
flags = flags | os.O_NONBLOCK
fcntl.fcntl(fd, fcntl.F_SETFL, flags)
def as_root(fn, *args, **kwargs):
try:
os.seteuid(0)
return fn(*args, **kwargs)
finally:
os.seteuid(os.getuid())
def sts_result(sts):
if os.WIFSIGNALED(sts):
return -os.WTERMSIG(sts)
elif os.WIFEXITED(sts):
return os.WEXITSTATUS(sts)
else:
raise os.error, "Not signaled or exited???"
def run_as_root(args, stdin=None):
if stdin is not None:
pipe_r, pipe_w = os.pipe()
else:
pipe_r, pipe_w = None, None
pid = os.fork()
if pid == 0:
if pipe_r is not None:
# setup stdin pipe
os.dup2(pipe_r, 0)
os.close(pipe_r)
os.close(pipe_w)
os.seteuid(0)
os.setuid(0)
try:
os.execv(args[0], args)
except:
os._exit(127)
else:
if pipe_r is not None:
os.close(pipe_r)
os.write(pipe_w, stdin)
os.close(pipe_w)
wpid, sts = os.waitpid(pid, 0)
code = sts_result(sts)
if code != 0:
raise MyException("%r: exited with result %d"% (args, code))
class Platform:
def setup_route(self, ifname, gateway_ip, net, bits, action):
pass
def setup_dns(self, iface_name, service_id, dns_servers, dns_domains, revdns_domains, override_gateway):
pass
def teardown_dns(self):
pass
class DummyPlatform:
def setup_route(self, ifname, gateway_ip, net, bits, action):
print "setup_route(ifname=%r, gateway_ip=%r, net=%r, bits=%r, action=%r" % (ifname, gateway_ip, net, bits, action)
def setup_host_route(self, ifname, gateway_ip, net, bits):
print "teardown_route(ifname=%r, gateway_ip=%r, net=%r, bits=%r" % (ifname, gateway_ip, net, bits)
def setup_dns(self, iface_name, service_id, dns_servers, dns_domains, revdns_domains, override_gateway):
print "setup_dns(iface_name=%r, service_id=%r, dns_servers=%r, dns_domains=%r, revdns_domains=%r, override_gateway=%r)" % (iface_name, service_id, dns_servers, dns_domains, revdns_domains, override_gateway)
def teardown_dns(self):
print "teardown_dns()"
class DarwinPlatform(Platform):
def __init__(self):
if os.path.exists("/sbin/route"):
self.route_path="/sbin/route"
elif os.path.exists("/usr/bin/route"):
self.route_path="/usr/bin/route"
else:
raise MyException("Couldn't find route command")
def setup_route(self, ifname, gateway_ip, net, bits, action):
args = [self.route_path, action, '-net', "%s/%s" % (net, bits)]
if ifname:
args += ['-interface', ifname]
else:
args += [gateway_ip]
run_as_root(args)
def load_SystemConfigurationFramework(self):
try:
# If it's already been wrapped, we're done.
import SystemConfiguration
return SystemConfiguration
except ImportError:
# Nope, so, try again, the hard way...
import objc
SystemConfiguration=types.ModuleType('SystemConfiguration')
SCbndl = objc.loadBundle(SystemConfiguration.__name__, SystemConfiguration.__dict__,
bundle_identifier="com.apple.SystemConfiguration")
objc.loadBundleFunctions(SCbndl, SystemConfiguration.__dict__, [
(u'SCDynamicStoreCreate', '@@@@@'),
(u'SCDynamicStoreSetValue', 'B@@@')
])
return SystemConfiguration
def setup_dns(self, iface_name, service_id, dns_servers, dns_domains, revdns_domains, override_gateway):
"""Setup DNS the OSX magic way."""
# Preferentially use the SystemConfiguration library (included with OSX
# 10.5) if available, as scutil has a command-length limitation of 256
# chars. With 256 chars it's generally not reasonable to add in the
# revdns domains, so don't bother trying.
# NOTE: There's a 3rd party SystemConfiguration package for 10.4 which
# seems to have a different API (that I don't support currently)
try:
SystemConfiguration=self.load_SystemConfigurationFramework()
SystemConfiguration.SCDynamicStoreCreate
except:
# fall back to scutil.
config = "d.init\n"
config += "d.add ServerAddresses * %s\n" % ' '.join(dns_servers)
if override_gateway:
config += "d.add SearchDomains * %s\n" % ' '.join(dns_domains)
else:
config += "d.add SupplementalMatchDomains * %s\n" % ' '.join(dns_domains)
config += "set State:/Network/Service/%s/DNS\n" % service_id
run_as_root(['/usr/sbin/scutil'], stdin=config)
else:
def setup_helper():
sc = SystemConfiguration.SCDynamicStoreCreate(None, "f5vpn-login", None, None)
d = SystemConfiguration.NSMutableDictionary.new()
d[u'ServerAddresses'] = dns_servers
if override_gateway:
d[u'SearchDomains'] = dns_domains
else:
d[u'SupplementalMatchDomains'] = dns_domains + revdns_domains
SystemConfiguration.SCDynamicStoreSetValue(sc, 'State:/Network/Service/%s/DNS' % service_id, d)
as_root(setup_helper)
class Linux2Platform(Platform):
def setup_route(self, ifname, gateway_ip, net, bits, action):
if bits == 32:
host_or_net = ["-host", net]
else:
host_or_net = ["-net", net, 'netmask', bits2mask[bits]]
run_as_root(['/sbin/route', action] + host_or_net +
['gw', gateway_ip])
class FreeBSD6Base(Platform):
def setup_route(self, ifname, gateway_ip, net, bits, action):
args = ['/sbin/route', action, "%s/%s" % (net, bits)]
if ifname:
args += ['-interface', ifname]
else:
args += [gateway_ip]
run_as_root(args)
class ManualFrobbingDNSMixin:
resolv_conf_timestamp = 0
def setup_dns(self, iface_name, service_id, dns_servers, dns_domains, revdns_domains, override_gateway):
if override_gateway:
old_resolv_conf = []
else:
old_resolv_conf = open("/etc/resolv.conf").readlines()
other_lines = []
search = ''
nses = []
for line in old_resolv_conf:
line = line.rstrip('\n')
if line.startswith('search ') or line.startswith('domain '):
# domain entry is simply an alternative spelling for search
search = line.split(' ', 1)[1]
elif line.startswith('nameserver '):
nses.append(line.split(' ', 1)[1])
else:
other_lines.append(line)
new_resolv_conf = []
new_resolv_conf.append("search %s %s" % (' '.join(dns_domains), search))
for ns in dns_servers + nses:
new_resolv_conf.append("nameserver %s" % ns)
new_resolv_conf.extend(other_lines)
new_resolv_conf.append('')
def _create_file():
os.rename('/etc/resolv.conf', '/etc/resolv.conf.f5_bak')
open('/etc/resolv.conf', 'w').write('\n'.join(new_resolv_conf))
as_root(_create_file)
self.resolv_conf_timestamp = os.stat('/etc/resolv.conf').st_mtime
def teardown_dns(self):
as_root(self._teardown_dns)
def _teardown_dns(self):
try:
if self.resolv_conf_timestamp == 0:
pass
elif os.stat('/etc/resolv.conf').st_mtime == self.resolv_conf_timestamp:
os.rename('/etc/resolv.conf.f5_bak', '/etc/resolv.conf')
else:
sys.stderr.write("Not restoring resolv.conf: modified by another process.\n")
os.unlink('/etc/resolv.conf.f5_bak')
except:
pass
class ResolvConfHelperDNSMixin:
def setup_dns(self, iface_name, service_id, dns_servers, dns_domains, revdns_domains, override_gateway):
# FIXME: should I be doing something different here based on override_gateway?
# ResolvConf is a system for managing your resolv.conf file in a
# structured way on unix systems. When it is installed, go through it,
# rather than munging the file manually (and thus causing potential
# conflicts)
# We append tun- to the interface so the proper record order is
# established with the resolvconf distribution. Since we're essentially
# using ppp for the same reason as most people would use tun, this
# should be okay
self.iface_name = iface_name
cmd = "nameserver %s\nsearch %s\n" % (' '.join(dns_servers), ' '.join(dns_domains))
run_as_root(['/sbin/resolvconf', '-a', 'tun-%s' % iface_name], stdin=cmd)
def teardown_dns(self):
as_root(self._teardown_dns)
def _teardown_dns(self):
try:
run_as_root(["/sbin/resolvconf", '-d', 'tun-%s' % self.iface_name])
except:
pass
class Linux2ManualPlatform(ManualFrobbingDNSMixin, Linux2Platform):
pass
class Linux2ResolvconfPlatform(ResolvConfHelperDNSMixin, Linux2Platform):
pass
class FreeBSD6Platform(ManualFrobbingDNSMixin, FreeBSD6Base):
pass
def get_platform():
if sys.platform == "darwin":
return DarwinPlatform()
elif sys.platform == "linux2":
# Choose a dns resolver setup routine
if os.path.exists('/sbin/resolvconf'):
return Linux2ResolvconfPlatform()
else:
return Linux2ManualPlatform()
elif sys.platform == "freebsd6":
return FreeBSD6Platform()
elif sys.platform == "freebsd7":
return FreeBSD6Platform()
elif sys.platform == "freebsd8":
return FreeBSD6Platform()
else:
# Other Unix-like platforms aren't supported at the moment...but there's
# no reason they can't be, when someone with such a platform tells me
# the syntax for their "route" command. Patches welcome!
raise MyException("Don't know how to setup routes/dns for platform %r" % sys.platform)
platform = get_platform()
##### SSL certificate checking support.
def get_subjectAltName(cert):
if not cert.has_key('subjectAltName'):
return ([],[])
ret = ([], [])
for rdn in cert['subjectAltName']:
if rdn[0].lower() == 'dns':
ret[0].append(rdn[1])
if rdn[0][:2].lower() == 'ip':
ret[1].append(rdn[1])
return ret
def get_commonName(cert):
if not cert.has_key('subject'):
return []
ret = []
for rdn in cert['subject']:
if rdn[0][0].lower() == 'commonname':
ret.append(rdn[0][1])
return ret
# WTF isn't this function in the python stdlib somewhere???
def verify_certificate_host(cert, ip, host):
def validate_entry(match):
if match.startswith('*.'):
hostparts = host.split('.', 1)
if len(hostparts) > 1:
if hostparts[1] == match[2:]:
return True
return host == match
cn = get_commonName(cert)
san, san_ip = get_subjectAltName(cert)
# TODO: check san_ip too...
if not (filter(validate_entry, cn) or filter(validate_entry, san)):
raise MyException("Invalid certificate, connecting to host %r, but cert is for cn: %r subjectAltName: %r.\nAre you being MITM'd? If not, try --dont-check-certificates\n" % (host, cn, san))
OSX_cert_tempfile = None
def OSX_get_a_certificate():
# This function is @#$@#@#$ retarded. Its only point is to extract a single
# cert from the OSX trusted cert store, so I can put it in a file, so I give
# that file to Python's SSL module (which gives it to OpenSSL), which then
# basically ignores that I'm explicitly telling it to only trust that one
# certificate, and uses all the certificates in OSX's trusted cert store,
# anyways. But it forces me to give it a file with a cert in it regardless
# of the fact that it's planning to use the **entire cert store**
# regardless of what I actually ask for...sigh. Why???
import objc, tempfile
global OSX_cert_tempfile
# ALSO, wtf doesn't Security.framework already have python wrappers like the
# rest of OSX's frameworks?? Just make up a minimal wrapper here...
Security=types.ModuleType('Security')
objc.loadBundle(Security.__name__, Security.__dict__,
bundle_identifier="com.apple.security")
objc.parseBridgeSupport('''<signatures version="0.9"><depends_on path="/System/Library/Frameworks/CoreFoundation.framework"/><enum name="kSecFormatX509Cert" value="9"/><enum name="kSecItemPemArmour" value="1"/><function name="SecTrustCopyAnchorCertificates"><arg type="o^@"/><retval type="l"/></function><function name="SecKeychainItemExport"><arg type="@"/><arg type="I"/><arg type="I"/><arg type="^{?=II^v@@@II}"/><arg type="o^@"/><retval type="l"/></function></signatures>''', Security.__dict__, Security.__name__)
res, certs = Security.SecTrustCopyAnchorCertificates(None)
if res == 0:
for cert in certs:
res, data = Security.SecKeychainItemExport(
cert,
Security.kSecFormatX509Cert, Security.kSecItemPemArmour, None, None)
if res == 0:
OSX_cert_tempfile = tempfile.NamedTemporaryFile()
OSX_cert_tempfile.write(str(buffer(data)))
OSX_cert_tempfile.flush()
return OSX_cert_tempfile.name
return None
def find_certificates_file():
global ssl_cert_path
if sslmodule is None:
sys.stderr.write("Warning: server certificate checking disabled, requires Python >= 2.6.\n")
return
# Check for the file in all the places I know about...
for p in CERTIFICATE_FILE_LOCATIONS:
if os.path.exists(p):
ssl_cert_path = p
break
# Oh, and for OSX, which doesn't ship a openssl cert file, do some black magic.
if not ssl_cert_path and sys.platform == "darwin":
ssl_cert_path = OSX_get_a_certificate()
if not ssl_cert_path:
sys.stderr.write("Warning: server certificate checking disabled, couldn't locate the certificates file.\n")
sys.stderr.write(" Do you know where it is on your OS? Lemme know...\n")
### END SSL certificate checking gunk
def readline_from_sock(s):
output = ''
while 1:
data = s.recv(1)
if not data:
break
elif data == '\n':
break
elif data != '\r':
output += data
return output
def proxy_connect(ip, port):
# Connect a socket to ip and port, and return a socket object.
# If a proxy is defined, connect via the proxy.
if proxy_addr and proxy_addr[0] == 'http':
s = socket.socket()
s.connect(proxy_addr[1:])
s.send("CONNECT %s:%d HTTP/1.0\r\n\r\n" % (ip, port))
statusline = readline_from_sock(s).split(' ')
if len(statusline) < 2 or statusline[1] != '200':
raise MyException("Proxy returned bad status for CONNECT: %r" % ' '.join(statusline))
while 1: # Read remaining headers, if any
line = readline_from_sock(s)
if line == '':
break
# Now the ssl connection is going
elif proxy_addr and proxy_addr[0] == 'socks5':
# Socks method
s = socks.socksocket()
s.setproxy(socks.PROXY_TYPE_SOCKS5, proxy_addr[1], proxy_addr[2])
s.connect((ip,port))
else:
s = socket.socket()
s.connect((ip,port))
return s
def parse_hostport(host, default_port=0):
ipport=host.split(':')
if len(ipport) == 1:
ip = ipport[0]
port = 443
else:
ip = ipport[0]
port = int(ipport[1])
return ip, port
def send_request(host, request):
ip, port = parse_hostport(host, 443)
s = proxy_connect(ip, port)
ssl = sslwrap(ip, s)
if verbosity >= 2:
print >>sys.stderr, "\n".join([">>> " + l for l in request.splitlines()])
ssl.write(request)
data = ''
while 1:
try:
newdata = ssl.read()
if not newdata:
break
data += newdata
except (socket.error, socket.sslerror), e:
if verbosity:
print >>sys.stderr, "send_request: %s" % e
break
if verbosity >= 2:
print >>sys.stderr, "\n".join(["<<< " + l for l in data.splitlines()])
return data
def get_vpn_client_data(host):
# Some FirePass servers are configured to redirect to an external "pre-login
# check" server. This server is supposed to run some random additional
# checks to see if it likes you, and then redirects back to the firepass,
# with the client_data gunk as an extra POST variable.
# If such an element is present, the firepass will refuse login unless we
# pass it through to the my.activation.php3 script. So, do so. Secureetay!
request = """GET /my.logon.php3?check=1&no_inspectors=1 HTTP/1.0\r
Accept: */*\r
Accept-Language: en\r
Cookie: uRoamTestCookie=TEST; VHOST=standard\r
Referer: https://%(host)s/my.activation.php3\r
User-Agent: Mozilla/5.0 (Macintosh; U; PPC Mac OS X; en) AppleWebKit/417.9 (KHTML, like Gecko) Safari/417.9.2\r
Host: %(host)s\r
\r
""" % dict(host=host)
result = send_request(host, request)
match = re.search('document.external_data_post_cls.client_data.value = \"([\w=]+)\"', result)
if match:
return match.group(1)
match = re.search('name="client_data" value="([\w=]+)"', result)
if match:
return match.group(1)
return ''
def do_login(client_data, host, username, password):
body="rsa_port=&vhost=standard&username=%(user)s&password=%(password)s&client_data=%(client_data)s&login=Logon&state=&mrhlogonform=1&miniui=1&tzoffsetmin=1&sessContentType=HTML&overpass=&lang=en&charset=iso-8859-1&uilang=en&uicharset=iso-8859-1&uilangchar=en.iso-8859-1&langswitcher=" % dict(user=quote_plus(username), password=quote_plus(password), client_data=client_data)
request = """POST /my.activation.php3 HTTP/1.0\r
Accept: */*\r
Accept-Language: en\r
Cookie: VHOST=standard; uRoamTestCookie=TEST\r
Content-Type: application/x-www-form-urlencoded\r
Referer: https://%(host)s/my.activation.php3\r
User-Agent: Mozilla/5.0 (Macintosh; U; PPC Mac OS X; en) AppleWebKit/417.9 (KHTML, like Gecko) Safari/417.9.2\r
Host: %(host)s\r
Content-Length: %(len)d\r
\r
%(body)s
""" % dict(host=host, len=len(body), body=body)
result = send_request(host, request)
session = None
pat = re.compile('^Set-Cookie: MRHSession=([^;]*);', re.MULTILINE)
for match in pat.finditer(result):
sessid = match.group(1)
if sessid == "deleted":
session = None
else:
session = sessid
if session is None:
pat = re.compile('<font color=red>(.*?)</font>', re.MULTILINE)
for match in pat.finditer(result):
sys.stderr.write(match.group(1) + '\n')
return None
match = re.search("(Challenge: [^<]*)", result)
if match:
sys.stderr.write(match.group(1)+"\n")
return None
sys.stderr.write("Login process failed, unknown output. Sorry!\n")
sys.stderr.write(result)
sys.stderr.write("\n")
sys.exit(1)
else:
return session
def get_vpn_menu_number(host, session):
# Find out the "Z" parameter to use to open a VPN connection
request = """GET /vdesk/vpn/index.php3?outform=xml HTTP/1.0\r
Accept: */*\r
Accept-Language: en\r
Cookie: uRoamTestCookie=TEST; VHOST=standard; MRHSession=%(session)s\r
Referer: https://%(host)s/my.activation.php3\r
User-Agent: Mozilla/5.0 (Macintosh; U; PPC Mac OS X; en) AppleWebKit/417.9 (KHTML, like Gecko) Safari/417.9.2\r
Host: %(host)s\r
\r
""" % dict(host=host, session=session)
result = send_request(host, request)
match = re.search('<favorite id="Z=([^"]*)">', result)
if match:
return match.group(1)
if re.search('^Location: /my.logon.php3', result):
# a redirect to the login page.
sys.stderr.write("Old session no longer valid.\n")
return None
def get_VPN_params(host, session, menu_number):
request = """GET /vdesk/vpn/connect.php3?Z=%(menu_number)s HTTP/1.0\r
Accept: */*\r
Accept-Language: en\r
Cookie: uRoamTestCookie=TEST; VHOST=standard; MRHSession=%(session)s\r
Referer: https://%(host)s/vdesk/index.php3\r
User-Agent: Mozilla/5.0 (Macintosh; U; PPC Mac OS X; en) AppleWebKit/417.9 (KHTML, like Gecko) Safari/417.9.2\r
Host: %(host)s\r
\r
""" % dict(menu_number=menu_number, session=session, host=host)
result = send_request(host, request)
#print "RESULT:", result
# Try to find the plugin parameters
matches = list(re.finditer("<embed [^>]*?(version=[^>]*)>", result))
if not matches:
# A new version of the server has switched to using javascript to write
# the parameters, now, so try matching that too.
matches = list(re.finditer("document.writeln\('(version=[^)]*)'\)", result))
if not matches:
if re.search('^Location: /my.logon.php3', result):
# a redirect to the login page.
sys.stderr.write("Old session no longer valid.\n")
return None
sys.stderr.write("Embed info output:\n")
sys.stderr.write(result)
return None
match = matches[-1]
params = match.group(1)
params = params.replace(' ', '&').replace('"', '')
paramsDict = decode_params(params)
return paramsDict
def decode_params(paramsStr):
paramsDict = {}
for param in paramsStr.split('&'):
k,v = param.split('=', 1)
if re.match('q[0-9]+', k):
k,v = v.decode('hex').split('=', 1)
paramsDict[k] = v
return paramsDict
class LogWatcher:
"""Collect (iface_name, tty, local_ip, remote_ip) from the ppp log messages
and call ppp_ip_up when they've all arrived."""
collected_log = ''
iface_name = tty = remote_ip = local_ip = None
notified = False
def __init__(self, ip_up):
self.ip_up = ip_up
def _get_match(self, exp):
match = re.search(exp, self.collected_log, re.MULTILINE)
if match is not None:
return match.group(1)
def process(self, logmsg):
print "PPPD LOG: %r" % logmsg
self.collected_log += logmsg
if self.iface_name is None:
self.iface_name = self._get_match("Using interface (.*)$")
if self.tty is None:
self.tty = self._get_match("Connect: .* <--> (.*)$")
if self.remote_ip is None:
self.remote_ip = self._get_match("remote IP address (.*)$")
if self.local_ip is None:
self.local_ip = self._get_match("local IP address (.*)$")
if not (self.notified or
self.iface_name is None or self.tty is None or
self.remote_ip is None or self.local_ip is None):
print "CALLING ip_up%r" % ((self.iface_name, self.tty, self.local_ip, self.remote_ip),)
self.notified = True
self.ip_up(self.iface_name, self.tty, self.local_ip, self.remote_ip)
keepalive_socket = None
def set_keepalive_host(host):
global keepalive_socket
keepalive_socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
keepalive_socket.connect((host, 7))
keepalive_socket.setblocking(0)
def run_event_loop(pppd_fd, ssl_socket, ssl, logpipe_r, ppp_ip_up):
ssl_socket.setblocking(0)
set_non_blocking(pppd_fd)
set_non_blocking(logpipe_r)
# Tiny little event-loop: don't try this at home.
ssl_write_blocked_on_read = False
ssl_read_blocked_on_write = False
data_to_pppd = ''
data_to_ssl = ''
data_to_ssl_buf2 = ''
def sigusr1(sig, frame):
sys.stderr.write("ssl_write_blocked_on_read=%r, ssl_read_blocked_on_write=%r, data_to_pppd=%r, data_to_ssl=%r, data_to_ssl_buf2=%r, time_since_last_activity=%r\n" % (ssl_write_blocked_on_read, ssl_read_blocked_on_write, data_to_pppd, data_to_ssl, data_to_ssl_buf2, time.time() - last_activity_time))
signal.signal(signal.SIGUSR1, sigusr1)
logwatcher = LogWatcher(ppp_ip_up)
last_activity_time = time.time()
while 1:
reads = [logpipe_r]
writes = []
# try to write data to pppd if pending, otherwise read more data from ssl
if data_to_pppd:
writes.append(pppd_fd)
else:
if ssl_read_blocked_on_write:
writes.append(ssl_socket)
else:
reads.append(ssl_socket)
# Conversely, write data to ssl if pending, otherwise read more data from pppd
if data_to_ssl:
if ssl_write_blocked_on_read:
reads.append(ssl_socket)
else:
writes.append(ssl_socket)
else:
reads.append(pppd_fd)
if keepalive_socket:
timeout = max(last_activity_time + KEEPALIVE_TIMEOUT - time.time(), 0)
else:
timeout = None
# Run the select, woot
try:
reads,writes,exc = select.select(reads, writes, [], timeout)
except select.error, se:
if se.args[0] not in (errno.EAGAIN, errno.EINTR):
raise
continue # loop back around to try again
if keepalive_socket and not reads and not writes:
# Returned from select because of timeout (probably)
if time.time() - last_activity_time > KEEPALIVE_TIMEOUT:
sys.stderr.write("Sending keepalive\n")
keepalive_socket.send('keepalive')
#print "SELECT GOT:", reads,writes,exc
# To simplify matters, don't bother with what select returned. Just try
# everything; it doesn't matter if it fails.
# Read data from log pipe
try:
logmsg = os.read(logpipe_r, 10000)
if not logmsg: #EOF
print "EOF on logpipe_r"
break
logwatcher.process(logmsg)
except OSError, se:
if se.args[0] not in (errno.EAGAIN, errno.EINTR):
raise
# Read data from pppd
if not data_to_ssl:
try:
data_to_ssl = os.read(pppd_fd, 10000)
if not data_to_ssl: #EOF
print "EOF on pppd"
break
#print "READ PPPD: %r" % data_to_ssl
except OSError, se:
if se.args[0] not in (errno.EAGAIN, errno.EINTR):
raise
# Read data from SSL
if not data_to_pppd:
try:
ssl_read_blocked_on_write = False
data_to_pppd = ssl.read()
if not data_to_pppd: #EOF
print "EOF on ssl"
break
last_activity_time = time.time()
except socket.sslerror, se:
if se.args[0] == socket.SSL_ERROR_WANT_READ:
pass
elif se.args[0] == socket.SSL_ERROR_WANT_WRITE:
ssl_read_blocked_on_write = True
else:
raise
#print "READ SSL: %r" % data_to_pppd
# Write data to pppd
if data_to_pppd:
try:
num_written = os.write(pppd_fd, data_to_pppd)
#print "WROTE PPPD: %r" % data_to_pppd[:num_written]
data_to_pppd = data_to_pppd[num_written:]
except OSError, se:
if se.args[0] not in (errno.EAGAIN, errno.EINTR):
raise
# Write data to SSL
if not data_to_ssl_buf2 and data_to_ssl:
# Write in SSL is not like unix write; you *must* call it with the
# same pointer as previously if it fails. Otherwise, it'll raise a
# "bad write retry" error.
data_to_ssl_buf2 = data_to_ssl
data_to_ssl = ''
if data_to_ssl_buf2:
try:
ssl_write_blocked_on_read = False
num_written = ssl.write(data_to_ssl_buf2)
# should always either write all data, or raise a WANT_*
assert num_written == len(data_to_ssl_buf2)
data_to_ssl_buf2 = ''
last_activity_time = time.time()
except socket.sslerror, se:
if se.args[0] == socket.SSL_ERROR_WANT_READ:
ssl_write_blocked_on_read = True
elif se.args[0] == socket.SSL_ERROR_WANT_WRITE:
pass
else:
raise
#print "WROTE SSL: %r" % data_to_ssl[:num_written]
def shutdown_pppd(pid):
res_pid, result = os.waitpid(pid, os.WNOHANG)
if res_pid and result != 0:
sys.stdout.write("PPPd exited unexpectedly with result %s\n" % result)
else:
sys.stdout.write("Shutting down pppd, please wait...\n")
os.kill(pid, signal.SIGTERM)
os.waitpid(pid, 0)
mask2bits = {}
bits2mask = [0]*33
for x in range(33):
mask = 2**32 - 2**(32-x)
mask2bits[mask] = x
bits2mask[x] = '%d.%d.%d.%d' % ((mask / 16777216), (mask / 65536) % 256,
(mask / 256) % 256, mask % 256)
def parts_to_int(parts):
num = 0
for n in parts:
num = num * 256 + n
num *= 256 ** (4 - len(parts))
return num
def parse_net_bits(routespec):
# This routine parses the following formats:
# w.x.y.z/numbits
# w.x.y.z/A.B.C.D
# w[.x[.y[.z]]] (netmask implicit in number of .s)
if '/' in routespec:
net, bits = routespec.split('/', 1)
netparts = map(int, net.split('.'))
while len(netparts) < 4:
netparts.append(0)
if '.' in bits:
netmaskparts = map(int, bits.split('.'))
netmask = 0
for n in netmaskparts:
netmask = netmask * 256 + n
netmask *= 256 ** (4 - len(netmaskparts))
bits = mask2bits.get(netmask)
if bits is None:
raise MyException("Non-contiguous netmask in routespec: %s\n" % (routespec,))
else:
bits = int(bits)
else:
netparts = map(int, routespec.split('.'))
bits = len(netparts) * 8
while len(netparts) < 4:
netparts.append(0)
return netparts, bits
def routespec_to_revdns(netparts, bits):
domain = 'in-addr.arpa'
i = 0
while bits >= 8:
domain = str(netparts[i]) + '.' + domain
bits -= 8
i += 1
if bits == 0:
return [domain]
else:
remaining_bits = 8 - bits
start_addr = netparts[i] & ~(2**remaining_bits - 1)
return [(str(n) + '.' + domain)
for n in range(start_addr, start_addr + 2**(remaining_bits))]
def execPPPd(params):
tunnel_host=params['tunnel_host0']
tunnel_port=int(params['tunnel_port0'])
serviceid = "f5vpn-%s"%tunnel_host
request = """GET /myvpn?sess=%s HTTP/1.0\r
Cookie: MRHSession=%s\r
\r
""" % (params['Session_ID'], params['Session_ID'])
for i in range(5):
try:
ssl_socket = proxy_connect(tunnel_host, tunnel_port)
ssl_socket.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, True)
ssl = sslwrap(tunnel_host, ssl_socket)
ssl.write(request)
initial_data = ssl.read()
break
except socket.sslerror, e:
# Sometimes the server seems to respond with "EOF occurred in violation of protocol"
# instead of establishing the connection. Try to deal with this by retrying...
if e.args[0] != 8:
raise
sys.stderr.write("VPN socket unexpectedly closed during connection setup, retrying (%d/5)...\n" % (i + 1))
# Make new PTY
(pppd_fd, slave_pppd_fd) = os.openpty()
# Make log pipe
logpipe_r,logpipe_w = os.pipe()
if params.get('LAN0'):
routes_to_add = [parse_net_bits(routespec)
for routespec in params['LAN0'].split(' ')]
else:
routes_to_add = []
override_gateway = ('UseDefaultGateway0' in params)
if override_gateway:
# If the server says to redirect the default gateway, we need to first add
# an explicit route for the VPN server with the /current/ default gateway.
tunnel_ip = ssl_socket.getpeername()[0]
# FIXME: This is a total hack...and incorrect in some cases, too. But
# it'll work in the normal case where the VPN server isn't on your local
# subnet. This should really be using some (platform-specific) method
# of finding the current route to tunnel_ip instead of assuming that's
# the default route.
gw_ip = os.popen("netstat -rn|grep '^default\|^0.0.0.0'|awk '{print $2}'").read().split()[0]
sys.stderr.write("Detected current default route: %r\n" % gw_ip)
sys.stderr.write("Attempting to delete and override route to VPN server.\n")
try:
platform.setup_route('', gw_ip, tunnel_ip, 32, 'delete')
except:
pass
platform.setup_route('', gw_ip, tunnel_ip, 32, 'add')
# Now, add a new default route, if it wasn't already specified (but not