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b7ca3d68c2
This patch: - bumps up the minimum version of python-nss - will initialize NSS with nodb if a CSR is loaded and it isn't already init'd - will shutdown NSS if initialized in the RPC subsystem so we use right db - updated and added a few more tests Relying more on NSS introduces a bit of a problem. For NSS to work you need to have initialized a database (either a real one or no_db). But once you've initialized one and want to use another you have to close down the first one. I've added some code to nsslib.py to do just that. This could potentially have some bad side-effects at some point, it works ok now.
252 lines
9.4 KiB
Python
252 lines
9.4 KiB
Python
# Authors: Rob Crittenden <rcritten@redhat.com>
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# John Dennis <jdennis@redhat.com>
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#
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# Copyright (C) 2009 Red Hat
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# see file 'COPYING' for use and warranty information
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License as
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# published by the Free Software Foundation; version 2 only
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#
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import httplib
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import getpass
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import logging
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from nss.error import NSPRError
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import nss.io as io
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import nss.nss as nss
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import nss.ssl as ssl
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def auth_certificate_callback(sock, check_sig, is_server, certdb):
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cert_is_valid = False
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cert = sock.get_peer_certificate()
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logging.debug("auth_certificate_callback: check_sig=%s is_server=%s\n%s",
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check_sig, is_server, str(cert))
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pin_args = sock.get_pkcs11_pin_arg()
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if pin_args is None:
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pin_args = ()
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# Define how the cert is being used based upon the is_server flag. This may
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# seem backwards, but isn't. If we're a server we're trying to validate a
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# client cert. If we're a client we're trying to validate a server cert.
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if is_server:
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intended_usage = nss.certificateUsageSSLClient
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else:
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intended_usage = nss.certificateUsageSSLServer
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try:
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# If the cert fails validation it will raise an exception, the errno attribute
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# will be set to the error code matching the reason why the validation failed
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# and the strerror attribute will contain a string describing the reason.
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approved_usage = cert.verify_now(certdb, check_sig, intended_usage, *pin_args)
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except Exception, e:
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logging.error('cert validation failed for "%s" (%s)', cert.subject, e.strerror)
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cert_is_valid = False
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return cert_is_valid
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logging.debug("approved_usage = %s intended_usage = %s",
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', '.join(nss.cert_usage_flags(approved_usage)),
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', '.join(nss.cert_usage_flags(intended_usage)))
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# Is the intended usage a proper subset of the approved usage
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if approved_usage & intended_usage:
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cert_is_valid = True
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else:
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cert_is_valid = False
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# If this is a server, we're finished
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if is_server or not cert_is_valid:
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logging.debug('cert valid %s for "%s"', cert_is_valid, cert.subject)
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return cert_is_valid
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# Certificate is OK. Since this is the client side of an SSL
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# connection, we need to verify that the name field in the cert
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# matches the desired hostname. This is our defense against
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# man-in-the-middle attacks.
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hostname = sock.get_hostname()
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try:
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# If the cert fails validation it will raise an exception
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cert_is_valid = cert.verify_hostname(hostname)
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except Exception, e:
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logging.error('failed verifying socket hostname "%s" matches cert subject "%s" (%s)',
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hostname, cert.subject, e.strerror)
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cert_is_valid = False
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return cert_is_valid
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logging.debug('cert valid %s for "%s"', cert_is_valid, cert.subject)
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return cert_is_valid
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def client_auth_data_callback(ca_names, chosen_nickname, password, certdb):
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cert = None
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if chosen_nickname:
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try:
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cert = nss.find_cert_from_nickname(chosen_nickname, password)
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priv_key = nss.find_key_by_any_cert(cert, password)
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return cert, priv_key
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except NSPRError:
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return False
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else:
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nicknames = nss.get_cert_nicknames(certdb, nss.SEC_CERT_NICKNAMES_USER)
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for nickname in nicknames:
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try:
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cert = nss.find_cert_from_nickname(nickname, password)
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if cert.check_valid_times():
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if cert.has_signer_in_ca_names(ca_names):
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priv_key = nss.find_key_by_any_cert(cert, password)
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return cert, priv_key
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except NSPRError:
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return False
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return False
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class NSSConnection(httplib.HTTPConnection):
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default_port = httplib.HTTPSConnection.default_port
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def __init__(self, host, port=None, strict=None, dbdir=None):
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httplib.HTTPConnection.__init__(self, host, port, strict)
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if not dbdir:
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raise RuntimeError("dbdir is required")
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logging.debug('%s init %s', self.__class__.__name__, host)
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if nss.nss_is_initialized():
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# close any open NSS database and use the new one
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ssl.clear_session_cache()
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nss.nss_shutdown()
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nss.nss_init(dbdir)
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ssl.set_domestic_policy()
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nss.set_password_callback(self.password_callback)
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# Create the socket here so we can do things like let the caller
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# override the NSS callbacks
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self.sock = ssl.SSLSocket()
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self.sock.set_ssl_option(ssl.SSL_SECURITY, True)
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self.sock.set_ssl_option(ssl.SSL_HANDSHAKE_AS_CLIENT, True)
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# Provide a callback which notifies us when the SSL handshake is complete
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self.sock.set_handshake_callback(self.handshake_callback)
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# Provide a callback to verify the servers certificate
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self.sock.set_auth_certificate_callback(auth_certificate_callback,
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nss.get_default_certdb())
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def password_callback(self, slot, retry, password):
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if not retry and password: return password
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return getpass.getpass("Enter password for %s: " % slot.token_name);
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def handshake_callback(self, sock):
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"""
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Verify callback. If we get here then the certificate is ok.
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"""
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logging.debug("handshake complete, peer = %s", sock.get_peer_name())
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pass
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def connect(self):
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logging.debug("connect: host=%s port=%s", self.host, self.port)
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self.sock.set_hostname(self.host)
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net_addr = io.NetworkAddress(self.host, self.port)
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logging.debug("connect: %s", net_addr)
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self.sock.connect(net_addr)
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class NSSHTTPS(httplib.HTTP):
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# We would like to use HTTP 1.1 not the older HTTP 1.0 but xmlrpclib
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# and httplib do not play well together. httplib when the protocol
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# is 1.1 will add a host header in the request. But xmlrpclib
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# always adds a host header irregardless of the HTTP protocol
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# version. That means the request ends up with 2 host headers,
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# but Apache freaks out if it sees 2 host headers, a known Apache
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# issue. httplib has a mechanism to skip adding the host header
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# (i.e. skip_host in HTTPConnection.putrequest()) but xmlrpclib
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# doesn't use it. Oh well, back to 1.0 :-(
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#
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#_http_vsn = 11
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#_http_vsn_str = 'HTTP/1.1'
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_connection_class = NSSConnection
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def __init__(self, host='', port=None, strict=None, dbdir=None):
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# provide a default host, pass the X509 cert info
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# urf. compensate for bad input.
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if port == 0:
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port = None
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self._setup(self._connection_class(host, port, strict, dbdir=dbdir))
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class NSPRConnection(httplib.HTTPConnection):
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default_port = httplib.HTTPConnection.default_port
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def __init__(self, host, port=None, strict=None):
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httplib.HTTPConnection.__init__(self, host, port, strict)
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logging.debug('%s init %s', self.__class__.__name__, host)
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self.sock = io.Socket()
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def connect(self):
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logging.debug("connect: host=%s port=%s", self.host, self.port)
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net_addr = io.NetworkAddress(self.host, self.port)
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logging.debug("connect: %s", net_addr)
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self.sock.connect(net_addr)
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class NSPRHTTP(httplib.HTTP):
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_http_vsn = 11
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_http_vsn_str = 'HTTP/1.1'
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_connection_class = NSPRConnection
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#------------------------------------------------------------------------------
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if __name__ == "__main__":
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logging.basicConfig(level=logging.DEBUG,
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format='%(asctime)s %(levelname)-8s %(message)s',
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datefmt='%m-%d %H:%M',
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filename='nsslib.log',
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filemode='a')
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# Create a seperate logger for the console
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console_logger = logging.StreamHandler()
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console_logger.setLevel(logging.DEBUG)
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# set a format which is simpler for console use
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formatter = logging.Formatter('%(levelname)s %(message)s')
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console_logger.setFormatter(formatter)
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# add the handler to the root logger
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logging.getLogger('').addHandler(console_logger)
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logging.info("Start")
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if False:
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conn = NSSConnection("www.verisign.com", 443, dbdir="/etc/pki/nssdb")
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conn.set_debuglevel(1)
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conn.connect()
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conn.request("GET", "/")
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response = conn.getresponse()
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print response.status
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#print response.msg
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print response.getheaders()
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data = response.read()
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#print data
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conn.close()
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if True:
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h = NSSHTTPS("www.verisign.com", 443, dbdir="/etc/pki/nssdb")
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h.connect()
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h.putrequest('GET', '/')
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h.endheaders()
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http_status, http_reason, headers = h.getreply()
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print "status = %s %s" % (http_status, http_reason)
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print "headers:\n%s" % headers
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f = h.getfile()
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data = f.read() # Get the raw HTML
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f.close()
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#print data
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