/usr/lib/python2.7/dist-packages/Bcfg2/Proxy.py is in bcfg2 1.3.3-1ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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import socket
import logging
# The ssl module is provided by either Python 2.6 or a separate ssl
# package that works on older versions of Python (see
# http://pypi.python.org/pypi/ssl). If neither can be found, look for
# M2Crypto instead.
try:
import ssl
SSL_LIB = 'py26_ssl'
SSL_ERROR = ssl.SSLError
except ImportError:
from M2Crypto import SSL
import M2Crypto.SSL.Checker
SSL_LIB = 'm2crypto'
SSL_ERROR = SSL.SSLError
import sys
import time
# Compatibility imports
from Bcfg2.Compat import httplib, xmlrpclib, urlparse, quote_plus
version = sys.version_info[:2]
has_py26 = version >= (2, 6)
has_py32 = version >= (3, 2)
__all__ = ["ComponentProxy",
"RetryMethod",
"SSLHTTPConnection",
"XMLRPCTransport"]
class ProxyError(Exception):
""" ProxyError provides a consistent reporting interface to
the various xmlrpclib errors that might arise (mainly
ProtocolError and Fault) """
def __init__(self, err):
msg = None
if isinstance(err, xmlrpclib.ProtocolError):
# cut out the password in the URL
url = re.sub(r'([^:]+):(.*?)@([^@]+:\d+/)', r'\1:******@\3',
err.url)
msg = "XML-RPC Protocol Error for %s: %s (%s)" % (url,
err.errmsg,
err.errcode)
elif isinstance(err, xmlrpclib.Fault):
msg = "XML-RPC Fault: %s (%s)" % (err.faultString,
err.faultCode)
else:
msg = str(err)
Exception.__init__(self, msg)
class CertificateError(Exception):
def __init__(self, commonName):
self.commonName = commonName
def __str__(self):
return ("Got unallowed commonName %s from server"
% self.commonName)
_orig_Method = xmlrpclib._Method
class RetryMethod(xmlrpclib._Method):
"""Method with error handling and retries built in."""
log = logging.getLogger('xmlrpc')
max_retries = 3
retry_delay = 1
def __call__(self, *args):
for retry in range(self.max_retries):
if retry >= self.max_retries - 1:
final = True
else:
final = False
msg = None
try:
return _orig_Method.__call__(self, *args)
except xmlrpclib.ProtocolError:
err = sys.exc_info()[1]
msg = "Server failure: Protocol Error: %s %s" % \
(err.errcode, err.errmsg)
except xmlrpclib.Fault:
msg = sys.exc_info()[1]
except socket.error:
err = sys.exc_info()[1]
if hasattr(err, 'errno') and err.errno == 336265218:
msg = "SSL Key error: %s" % err
elif hasattr(err, 'errno') and err.errno == 185090050:
msg = "SSL CA error: %s" % err
elif final:
msg = "Server failure: %s" % err
except CertificateError:
err = sys.exc_info()[1]
msg = "Got unallowed commonName %s from server" % \
err.commonName
except KeyError:
err = sys.exc_info()[1]
msg = "Server disallowed connection: %s" % err
except ProxyError:
err = sys.exc_info()[1]
msg = err
except:
etype, err = sys.exc_info()[:2]
msg = "Unknown failure: %s (%s)" % (err, etype.__name__)
if msg:
if final:
self.log.error(msg)
raise ProxyError(msg)
else:
self.log.info(msg)
time.sleep(self.retry_delay)
xmlrpclib._Method = RetryMethod
class SSLHTTPConnection(httplib.HTTPConnection):
"""Extension of HTTPConnection that
implements SSL and related behaviors.
"""
logger = logging.getLogger('Bcfg2.Proxy.SSLHTTPConnection')
def __init__(self, host, port=None, strict=None, timeout=90, key=None,
cert=None, ca=None, scns=None, protocol='xmlrpc/ssl'):
"""Initializes the `httplib.HTTPConnection` object and stores security
parameters
Parameters
----------
host : string
Name of host to contact
port : int, optional
Port on which to contact the host. If none is specified,
the default port of 80 will be used unless the `host`
string has a port embedded in the form host:port.
strict : Boolean, optional
Passed to the `httplib.HTTPConnection` constructor and if
True, causes the `BadStatusLine` exception to be raised if
the status line cannot be parsed as a valid HTTP 1.0 or
1.1 status.
timeout : int, optional
Causes blocking operations to timeout after `timeout`
seconds.
key : string, optional
The file system path to the local endpoint's SSL key. May
specify the same file as `cert` if using a file that
contains both. See
http://docs.python.org/library/ssl.html#ssl-certificates
for details. Required if using xmlrpc/ssl with client
certificate authentication.
cert : string, optional
The file system path to the local endpoint's SSL
certificate. May specify the same file as `cert` if using
a file that contains both. See
http://docs.python.org/library/ssl.html#ssl-certificates
for details. Required if using xmlrpc/ssl with client
certificate authentication.
ca : string, optional
The file system path to a set of concatenated certificate
authority certs, which are used to validate certificates
passed from the other end of the connection.
scns : array-like, optional
List of acceptable server commonNames. The peer cert's
common name must appear in this list, otherwise the
connect() call will throw a `CertificateError`.
protocol : {'xmlrpc/ssl', 'xmlrpc/tlsv1'}, optional
Communication protocol to use.
"""
if not has_py26:
httplib.HTTPConnection.__init__(self, host, port, strict)
elif not has_py32:
httplib.HTTPConnection.__init__(self, host, port, strict, timeout)
else:
# the strict parameter is deprecated.
# HTTP 0.9-style "Simple Responses" are not supported anymore.
httplib.HTTPConnection.__init__(self, host, port, timeout=timeout)
self.key = key
self.cert = cert
self.ca = ca
self.scns = scns
self.protocol = protocol
self.timeout = timeout
def connect(self):
"""Initiates a connection using previously set attributes."""
if SSL_LIB == 'py26_ssl':
self._connect_py26ssl()
elif SSL_LIB == 'm2crypto':
self._connect_m2crypto()
else:
raise Exception("No SSL module support")
def _connect_py26ssl(self):
"""Initiates a connection using the ssl module."""
# check for IPv6
hostip = socket.getaddrinfo(self.host,
self.port,
socket.AF_UNSPEC,
socket.SOCK_STREAM)[0][4][0]
if ':' in hostip:
rawsock = socket.socket(socket.AF_INET6, socket.SOCK_STREAM)
else:
rawsock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
if self.protocol == 'xmlrpc/ssl':
ssl_protocol_ver = ssl.PROTOCOL_SSLv23
elif self.protocol == 'xmlrpc/tlsv1':
ssl_protocol_ver = ssl.PROTOCOL_TLSv1
else:
self.logger.error("Unknown protocol %s" % (self.protocol))
raise Exception("unknown protocol %s" % self.protocol)
if self.ca:
other_side_required = ssl.CERT_REQUIRED
else:
other_side_required = ssl.CERT_NONE
self.logger.warning("No ca is specified. Cannot authenticate the server with SSL.")
if self.cert and not self.key:
self.logger.warning("SSL cert specfied, but no key. Cannot authenticate this client with SSL.")
self.cert = None
if self.key and not self.cert:
self.logger.warning("SSL key specfied, but no cert. Cannot authenticate this client with SSL.")
self.key = None
rawsock.settimeout(self.timeout)
self.sock = ssl.SSLSocket(rawsock, cert_reqs=other_side_required,
ca_certs=self.ca, suppress_ragged_eofs=True,
keyfile=self.key, certfile=self.cert,
ssl_version=ssl_protocol_ver)
self.sock.connect((self.host, self.port))
peer_cert = self.sock.getpeercert()
if peer_cert and self.scns:
scn = [x[0][1] for x in peer_cert['subject'] if x[0][0] == 'commonName'][0]
if scn not in self.scns:
raise CertificateError(scn)
self.sock.closeSocket = True
def _connect_m2crypto(self):
"""Initiates a connection using the M2Crypto module."""
if self.protocol == 'xmlrpc/ssl':
ctx = SSL.Context('sslv23')
elif self.protocol == 'xmlrpc/tlsv1':
ctx = SSL.Context('tlsv1')
else:
self.logger.error("Unknown protocol %s" % (self.protocol))
raise Exception("unknown protocol %s" % self.protocol)
if self.ca:
# Use the certificate authority to validate the cert
# presented by the server
ctx.set_verify(SSL.verify_peer | SSL.verify_fail_if_no_peer_cert, depth=9)
if ctx.load_verify_locations(self.ca) != 1:
raise Exception('No CA certs')
else:
self.logger.warning("No ca is specified. Cannot authenticate the server with SSL.")
if self.cert and self.key:
# A cert/key is defined, use them to support client
# authentication to the server
ctx.load_cert(self.cert, self.key)
elif self.cert:
self.logger.warning("SSL cert specfied, but no key. Cannot authenticate this client with SSL.")
elif self.key:
self.logger.warning("SSL key specfied, but no cert. Cannot authenticate this client with SSL.")
self.sock = SSL.Connection(ctx)
if re.match('\\d+\\.\\d+\\.\\d+\\.\\d+', self.host):
# host is ip address
try:
hostname = socket.gethostbyaddr(self.host)[0]
except:
# fall back to ip address
hostname = self.host
else:
hostname = self.host
try:
self.sock.connect((hostname, self.port))
# automatically checks cert matches host
except M2Crypto.SSL.Checker.WrongHost:
wr = sys.exc_info()[1]
raise CertificateError(wr)
class XMLRPCTransport(xmlrpclib.Transport):
def __init__(self, key=None, cert=None, ca=None,
scns=None, use_datetime=0, timeout=90):
if hasattr(xmlrpclib.Transport, '__init__'):
xmlrpclib.Transport.__init__(self, use_datetime)
self.key = key
self.cert = cert
self.ca = ca
self.scns = scns
self.timeout = timeout
def make_connection(self, host):
host, self._extra_headers = self.get_host_info(host)[0:2]
return SSLHTTPConnection(host,
key=self.key,
cert=self.cert,
ca=self.ca,
scns=self.scns,
timeout=self.timeout)
def request(self, host, handler, request_body, verbose=0):
"""Send request to server and return response."""
try:
conn = self.send_request(host, handler, request_body, False)
response = conn.getresponse()
errcode = response.status
errmsg = response.reason
headers = response.msg
except (socket.error, SSL_ERROR, httplib.BadStatusLine):
err = sys.exc_info()[1]
raise ProxyError(xmlrpclib.ProtocolError(host + handler,
408,
str(err),
self._extra_headers))
if errcode != 200:
raise ProxyError(xmlrpclib.ProtocolError(host + handler,
errcode,
errmsg,
headers))
self.verbose = verbose
return self.parse_response(response)
if sys.hexversion < 0x03000000:
# pylint: disable=E1101
def send_request(self, host, handler, request_body, debug):
""" send_request() changed significantly in py3k."""
conn = self.make_connection(host)
xmlrpclib.Transport.send_request(self, conn, handler, request_body)
self.send_host(conn, host)
self.send_user_agent(conn)
self.send_content(conn, request_body)
return conn
# pylint: enable=E1101
def ComponentProxy(url, user=None, password=None, key=None, cert=None, ca=None,
allowedServerCNs=None, timeout=90, retries=3, delay=1):
"""Constructs proxies to components.
Arguments:
component_name -- name of the component to connect to
Additional arguments are passed to the ServerProxy constructor.
"""
xmlrpclib._Method.max_retries = retries
xmlrpclib._Method.retry_delay = delay
if user and password:
method, path = urlparse(url)[:2]
newurl = "%s://%s:%s@%s" % (method, quote_plus(user, ''),
quote_plus(password, ''), path)
else:
newurl = url
ssl_trans = XMLRPCTransport(key, cert, ca,
allowedServerCNs, timeout=float(timeout))
return xmlrpclib.ServerProxy(newurl, allow_none=True, transport=ssl_trans)
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