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55f89dc689
freeipa/ipapython/nsslib.py
Rob Crittenden 55f89dc689 Do kinit in client before connecting to backend 
The client installer was failing because a backend connection could be
created before a kinit was done.

Allow multiple simultaneous connections. This could fail with an NSS
shutdown error when the second connection was created (objects still
in use). If all connections currently use the same database then there
is no need to initialize, let it be skipped.

Add additional logging to client installer.

https://fedorahosted.org/freeipa/ticket/2478
2012-03-04 17:23:01 -05:00

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# Authors: Rob Crittenden <rcritten@redhat.com>
# John Dennis <jdennis@redhat.com>
#
# Copyright (C) 2009 Red Hat
# see file 'COPYING' for use and warranty information
#
# 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/>.
#
import sys
import httplib
import getpass
import socket
from ipapython.ipa_log_manager import *
from nss.error import NSPRError
import nss.io as io
import nss.nss as nss
import nss.ssl as ssl
import nss.error as error
def auth_certificate_callback(sock, check_sig, is_server, certdb):
cert_is_valid = False
cert = sock.get_peer_certificate()
root_logger.debug("auth_certificate_callback: check_sig=%s is_server=%s\n%s",
check_sig, is_server, str(cert))
pin_args = sock.get_pkcs11_pin_arg()
if pin_args is None:
pin_args = ()
# Define how the cert is being used based upon the is_server flag. This may
# seem backwards, but isn't. If we're a server we're trying to validate a
# client cert. If we're a client we're trying to validate a server cert.
if is_server:
intended_usage = nss.certificateUsageSSLClient
else:
intended_usage = nss.certificateUsageSSLServer
try:
# If the cert fails validation it will raise an exception, the errno attribute
# will be set to the error code matching the reason why the validation failed
# and the strerror attribute will contain a string describing the reason.
approved_usage = cert.verify_now(certdb, check_sig, intended_usage, *pin_args)
except Exception, e:
root_logger.error('cert validation failed for "%s" (%s)', cert.subject, e.strerror)
cert_is_valid = False
return cert_is_valid
root_logger.debug("approved_usage = %s intended_usage = %s",
', '.join(nss.cert_usage_flags(approved_usage)),
', '.join(nss.cert_usage_flags(intended_usage)))
# Is the intended usage a proper subset of the approved usage
if approved_usage & intended_usage:
cert_is_valid = True
else:
cert_is_valid = False
# If this is a server, we're finished
if is_server or not cert_is_valid:
root_logger.debug('cert valid %s for "%s"', cert_is_valid, cert.subject)
return cert_is_valid
# Certificate is OK. Since this is the client side of an SSL
# connection, we need to verify that the name field in the cert
# matches the desired hostname. This is our defense against
# man-in-the-middle attacks.
hostname = sock.get_hostname()
try:
# If the cert fails validation it will raise an exception
cert_is_valid = cert.verify_hostname(hostname)
except Exception, e:
root_logger.error('failed verifying socket hostname "%s" matches cert subject "%s" (%s)',
hostname, cert.subject, e.strerror)
cert_is_valid = False
return cert_is_valid
root_logger.debug('cert valid %s for "%s"', cert_is_valid, cert.subject)
return cert_is_valid
def client_auth_data_callback(ca_names, chosen_nickname, password, certdb):
cert = None
if chosen_nickname:
try:
cert = nss.find_cert_from_nickname(chosen_nickname, password)
priv_key = nss.find_key_by_any_cert(cert, password)
return cert, priv_key
except NSPRError:
return False
else:
nicknames = nss.get_cert_nicknames(certdb, nss.SEC_CERT_NICKNAMES_USER)
for nickname in nicknames:
try:
cert = nss.find_cert_from_nickname(nickname, password)
if cert.check_valid_times():
if cert.has_signer_in_ca_names(ca_names):
priv_key = nss.find_key_by_any_cert(cert, password)
return cert, priv_key
except NSPRError:
return False
return False
class NSSAddressFamilyFallback(object):
def __init__(self, family):
self.sock_family = family
self.family = self._get_nss_family(self.sock_family)
def _get_nss_family(self, sock_family):
"""
Translate a family from python socket module to nss family.
"""
if sock_family in [ socket.AF_INET, socket.AF_UNSPEC ]:
return io.PR_AF_INET
elif sock_family == socket.AF_INET6:
return io.PR_AF_INET6
else:
raise ValueError('Uknown socket family %d\n', sock_family)
def _get_next_family(self):
if self.sock_family == socket.AF_UNSPEC and \
self.family == io.PR_AF_INET:
return io.PR_AF_INET6
return None
def _create_socket(self):
self.sock = io.Socket(family=self.family)
def _connect_socket_family(self, host, port, family):
root_logger.debug("connect_socket_family: host=%s port=%s family=%s",
host, port, io.addr_family_name(family))
try:
addr_info = [ ai for ai in io.AddrInfo(host) if ai.family == family ]
# No suitable families
if len(addr_info) == 0:
raise NSPRError(error.PR_ADDRESS_NOT_SUPPORTED_ERROR,
"Cannot resolve %s using family %s" % (host, io.addr_family_name(family)))
# Try connecting to the NetworkAddresses
for net_addr in addr_info:
net_addr.port = port
root_logger.debug("connecting: %s", net_addr)
try:
self.sock.connect(net_addr)
except Exception, e:
root_logger.debug("Could not connect socket to %s, error: %s, retrying..",
net_addr, str(e))
continue
else:
return
# Could not connect with any of NetworkAddresses
raise NSPRError(error.PR_ADDRESS_NOT_SUPPORTED_ERROR,
"Could not connect to %s using any address" % host)
except ValueError, e:
raise NSPRError(error.PR_ADDRESS_NOT_SUPPORTED_ERROR, e.message)
def connect_socket(self, host, port):
try:
self._connect_socket_family(host, port, self.family)
except NSPRError, e:
if e.errno == error.PR_ADDRESS_NOT_SUPPORTED_ERROR:
next_family = self._get_next_family()
if next_family:
self.family = next_family
self._create_socket()
self._connect_socket_family(host, port, self.family)
else:
root_logger.debug('No next family to try..')
raise e
else:
raise e
class NSSConnection(httplib.HTTPConnection, NSSAddressFamilyFallback):
default_port = httplib.HTTPSConnection.default_port
def __init__(self, host, port=None, strict=None,
dbdir=None, family=socket.AF_UNSPEC, no_init=False):
"""
:param host: the server to connect to
:param port: the port to use (default is set in HTTPConnection)
:param dbdir: the NSS database directory
:param family: network family to use (default AF_UNSPEC)
:param no_init: do not initialize the NSS database. This requires
that the database has already been initialized or
the request will fail.
"""
httplib.HTTPConnection.__init__(self, host, port, strict)
NSSAddressFamilyFallback.__init__(self, family)
if not dbdir:
raise RuntimeError("dbdir is required")
root_logger.debug('%s init %s', self.__class__.__name__, host)
if not no_init and nss.nss_is_initialized():
# close any open NSS database and use the new one
ssl.clear_session_cache()
try:
nss.nss_shutdown()
except NSPRError, e:
if e.errno != error.SEC_ERROR_NOT_INITIALIZED:
raise e
nss.nss_init(dbdir)
ssl.set_domestic_policy()
nss.set_password_callback(self.password_callback)
self._create_socket()
def _create_socket(self):
#TODO remove the try block once python-nss is guaranteed to
#contain these values
try :
ssl_enable_renegotiation = SSL_ENABLE_RENEGOTIATION #pylint: disable=E0602
ssl_require_safe_negotiation = SSL_REQUIRE_SAFE_NEGOTIATION #pylint: disable=E0602
ssl_renegotiate_requires_xtn = SSL_RENEGOTIATE_REQUIRES_XTN #pylint: disable=E0602
except :
ssl_enable_renegotiation = 20
ssl_require_safe_negotiation = 21
ssl_renegotiate_requires_xtn = 2
# Create the socket here so we can do things like let the caller
# override the NSS callbacks
self.sock = ssl.SSLSocket(family=self.family)
self.sock.set_ssl_option(ssl.SSL_SECURITY, True)
self.sock.set_ssl_option(ssl.SSL_HANDSHAKE_AS_CLIENT, True)
self.sock.set_ssl_option(ssl_require_safe_negotiation, False)
self.sock.set_ssl_option(ssl_enable_renegotiation, ssl_renegotiate_requires_xtn)
# Provide a callback which notifies us when the SSL handshake is complete
self.sock.set_handshake_callback(self.handshake_callback)
# Provide a callback to verify the servers certificate
self.sock.set_auth_certificate_callback(auth_certificate_callback,
nss.get_default_certdb())
self.sock.set_hostname(self.host)
def password_callback(self, slot, retry, password):
if not retry and password: return password
return getpass.getpass("Enter password for %s: " % slot.token_name);
def handshake_callback(self, sock):
"""
Verify callback. If we get here then the certificate is ok.
"""
root_logger.debug("handshake complete, peer = %s", sock.get_peer_name())
pass
def connect(self):
self.connect_socket(self.host, self.port)
def endheaders(self, message=None):
"""
Explicitly close the connection if an error is returned after the
headers are sent. This will likely mean the initial SSL handshake
failed. If this isn't done then the connection is never closed and
subsequent NSS activities will fail with a BUSY error.
"""
try:
# FIXME: httplib uses old-style classes so super doesn't work
# Python 2.7 changed the API for endheaders. This is an attempt
# to work across versions
(major, minor, micro, releaselevel, serial) = sys.version_info
if major == 2 and minor < 7:
httplib.HTTPConnection.endheaders(self)
else:
httplib.HTTPConnection.endheaders(self, message)
except NSPRError, e:
self.close()
raise e
class NSSHTTPS(httplib.HTTP):
# We would like to use HTTP 1.1 not the older HTTP 1.0 but xmlrpclib
# and httplib do not play well together. httplib when the protocol
# is 1.1 will add a host header in the request. But xmlrpclib
# always adds a host header irregardless of the HTTP protocol
# version. That means the request ends up with 2 host headers,
# but Apache freaks out if it sees 2 host headers, a known Apache
# issue. httplib has a mechanism to skip adding the host header
# (i.e. skip_host in HTTPConnection.putrequest()) but xmlrpclib
# doesn't use it. Oh well, back to 1.0 :-(
#
#_http_vsn = 11
#_http_vsn_str = 'HTTP/1.1'
_connection_class = NSSConnection
def __init__(self, host='', port=None, strict=None, dbdir=None):
# provide a default host, pass the X509 cert info
# urf. compensate for bad input.
if port == 0:
port = None
self._setup(self._connection_class(host, port, strict, dbdir=dbdir))
def getreply(self):
"""
Override so we can close duplicated file connection on non-200
responses. This was causing nss_shutdown() to fail with a busy
error.
"""
(status, reason, msg) = httplib.HTTP.getreply(self)
if status != 200:
self.file.close()
return (status, reason, msg)
#------------------------------------------------------------------------------
if __name__ == "__main__":
standard_logging_setup('nsslib.log', debug=True, filemode='a')
root_logger.info("Start")
if False:
conn = NSSConnection("www.verisign.com", 443, dbdir="/etc/pki/nssdb")
conn.set_debuglevel(1)
conn.connect()
conn.request("GET", "/")
response = conn.getresponse()
print response.status
#print response.msg
print response.getheaders()
data = response.read()
#print data
conn.close()
if True:
h = NSSHTTPS("www.verisign.com", 443, dbdir="/etc/pki/nssdb")
h.connect()
h.putrequest('GET', '/')
h.endheaders()
http_status, http_reason, headers = h.getreply()
print "status = %s %s" % (http_status, http_reason)
print "headers:\n%s" % headers
f = h.getfile()
data = f.read() # Get the raw HTML
f.close()
#print data
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