257 lines
8 KiB
Python
257 lines
8 KiB
Python
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#
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# Copyright 2007 sense.lab e.V.
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#
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# This file is part of the CryptoBox.
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#
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# The CryptoBox is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# The CryptoBox 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 the CryptoBox; 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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"""Create an SSL certificate to encrypt the webinterface connection via stunnel
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requires:
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- stunnel (>= 4.0)
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- "M2Crypto" python module
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"""
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__revision__ = "$Id"
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import cryptobox.plugins.base
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import subprocess
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import os
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import cherrypy
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CERT_FILENAME = 'cryptobox-ssl-certificate.pem'
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KEY_BITS = 1024
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ISSUER_INFOS = {
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"ST": "SomeIssuerState",
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"L": "SomeIssuerLocality",
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"O": "SomeIssuerOrganization",
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"OU": "CryptoBox-ServerIssuer",
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"CN": "cryptoboxIssuer",
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"emailAddress": "infoIssuer@cryptobox.org"}
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CERT_INFOS = {
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"ST": "SomeState",
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"L": "SomeLocality",
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"O": "SomeOrganization",
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"OU": "CryptoBox-Server",
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"CN": "*",
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"emailAddress": "info@cryptobox.org"}
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EXPIRE_TIME = 60*60*24*365*20 # 20 years forward and backward
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SIGN_DIGEST = "md5"
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PID_FILE = os.path.join("/tmp/cryptobox-stunnel.pid")
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class encrypted_webinterface(cryptobox.plugins.base.CryptoBoxPlugin):
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"""Provide an encrypted webinterface connection via stunnel
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"""
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plugin_capabilities = [ "system" ]
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plugin_visibility = []
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request_auth = True
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rank = 80
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def do_action(self):
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"""The action handler.
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"""
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return None
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def get_status(self):
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"""Retrieve the current state of the webinterface connection
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"""
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if self.__is_encrypted():
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return "1"
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else:
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return "0"
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def get_warnings(self):
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"""check if the connection is encrypted
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"""
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warnings = []
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## check if m2crypto is available
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try:
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import M2Crypto
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except ImportError:
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warnings.append((45, "Plugins.%s.MissingModuleM2Crypto" % self.get_name()))
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if not os.path.isfile(self.root_action.STUNNEL_BIN):
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warnings.append((44, "Plugins.%s.MissingProgramStunnel" % self.get_name()))
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if not self.__is_encrypted():
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## plaintext connection -> "heavy security risk" (priority=20..39)
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warnings.append((25, "Plugins.%s.NoSSL" % self.get_name()))
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return warnings
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def __is_encrypted(self):
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"""perform some checks for encrypted connections
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"""
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if cherrypy.request.scheme == "https":
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return True
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## check an environment setting - this is quite common behind proxies
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if os.environ.has_key("HTTPS"):
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return True
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## check if it is a local connection (or via stunnel)
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if cherrypy.request.headers.has_key("Remote-Host") \
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and (cherrypy.request.headers["Remote-Host"] == "127.0.0.1"):
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return True
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## the arbitrarily chosen header is documented in README.proxy
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if cherrypy.request.headers.has_key("X-SSL-Request") \
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and (cherrypy.request.headers["X-SSL-Request"] == "1"):
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return True
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## it looks like a plain connection
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return False
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def handle_event(self, event, event_info=None):
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"""Create a certificate during startup (if it does not exist) and run stunnel
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"""
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if event == "bootup":
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cert_abs_name = self.cbox.prefs.get_misc_config_filename(CERT_FILENAME)
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if not os.path.isfile(cert_abs_name):
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try:
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cert = self.__get_certificate()
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self.cbox.prefs.create_misc_config_file(CERT_FILENAME, cert)
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self.cbox.log.info("Created new SSL certificate: %s" % \
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cert_abs_name)
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## make it non-readable for other users
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try:
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os.chmod(cert_abs_name, 0600)
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except OSError, err_msg:
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self.cbox.log.warn("Failed to change permissions of secret " \
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+ "certificate file (%s): %s" % \
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(cert_abs_name, err_msg))
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except IOError, err_msg:
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## do not run stunnel without a certificate
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self.cbox.log.warn("Failed to create new SSL certificate (%s): %s" \
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% (cert_abs_name, err_msg))
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return
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self.__run_stunnel(cert_abs_name)
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elif event == "shutdown":
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self.__kill_stunnel()
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def __kill_stunnel(self):
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"""try to kill a running stunnel daemon
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"""
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if not os.path.isfile(PID_FILE):
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self.cbox.log.warn("Could not find the pid file of a running stunnel " \
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+ "daemon: %s" % PID_FILE)
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return
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try:
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pfile = open(PID_FILE, "r")
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try:
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pid = pfile.read().strip()
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except IOError, err_msg:
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self.cbox.log.warn("Failed to read the pid file (%s): %s" % (PID_FILE, err_msg))
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pfile.close()
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return
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pfile.close()
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except IOError, err_msg:
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self.cbox.log.warn("Failed to open the pid file (%s): %s" % (PID_FILE, err_msg))
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return
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if pid.isdigit():
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pid = int(pid)
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else:
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return
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try:
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## SIGTERM = 15
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os.kill(pid, 15)
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self.cbox.log.info("Successfully stopped stunnel")
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try:
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os.remove(PID_FILE)
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except OSError, err_msg:
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self.cbox.log.warn("Failed to remove the pid file (%s) of stunnel: %s" \
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% (PID_FILE, err_msg))
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except OSError, err_msg:
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self.cbox.log.warn("Failed to kill stunnel process (PID: %d): %s" % \
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(pid, err_msg))
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def __run_stunnel(self, cert_name, dest_port=443):
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## retrieve currently requested port (not necessarily the port served
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## by cherrypy - e.g. in a proxy setup)
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request_port = cherrypy.config.get("server.socket_port", 80)
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self.cbox.log.debug("[encrypted_webinterface] starting " \
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+ "%s on port %s for %s" % \
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(self.root_action.STUNNEL_BIN, dest_port, request_port))
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proc = subprocess.Popen(
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shell = False,
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stdout = subprocess.PIPE,
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stderr = subprocess.PIPE,
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args = [
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self.cbox.prefs["Programs"]["super"],
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self.cbox.prefs["Programs"]["CryptoBoxRootActions"],
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"plugin", os.path.join(self.plugin_dir, "root_action.py"),
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cert_name,
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str(request_port),
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str(dest_port),
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PID_FILE ])
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(output, error) = proc.communicate()
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if proc.returncode == 0:
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self.cbox.log.info("Successfully started 'stunnel'")
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return True
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else:
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self.cbox.log.warn("Failed to run 'stunnel': %s" % error)
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return False
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def __get_certificate(self):
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"""Create a self-signed certificate and return its pem content
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The code is mainly inspired by:
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https://dev.tribler.org/browser/m2crypto/trunk/contrib/SimpleX509create.py
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"""
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import M2Crypto
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import time
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string_type = 0x1000 | 1 # see http://www.koders.com/python/..
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# ../fid07A99E089F55187896A06CD4E0B6F21B9B8F5B0B.aspx?s=bavaria
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key_gen_number = 0x10001 # commonly used for key generation: 65537
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rsa_key = M2Crypto.RSA.gen_key(KEY_BITS, key_gen_number, callback=lambda: None)
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rsa_key2 = M2Crypto.RSA.gen_key(KEY_BITS, key_gen_number, callback=lambda: None)
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pkey = M2Crypto.EVP.PKey(md=SIGN_DIGEST)
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pkey.assign_rsa(rsa_key)
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sign_key = M2Crypto.EVP.PKey(md=SIGN_DIGEST)
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sign_key.assign_rsa(rsa_key2)
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subject = M2Crypto.X509.X509_Name()
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for (key, value) in CERT_INFOS.items():
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subject.add_entry_by_txt(key, string_type, value, -1, -1, 0)
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issuer = M2Crypto.X509.X509_Name(M2Crypto.m2.x509_name_new())
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for (key, value) in ISSUER_INFOS.items():
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issuer.add_entry_by_txt(key, string_type, value, -1, -1, 0)
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## time object
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asn_time1 = M2Crypto.ASN1.ASN1_UTCTIME()
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asn_time1.set_time(long(time.time()) - EXPIRE_TIME)
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asn_time2 = M2Crypto.ASN1.ASN1_UTCTIME()
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asn_time2.set_time(long(time.time()) + EXPIRE_TIME)
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request = M2Crypto.X509.Request()
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request.set_subject_name(subject)
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request.set_pubkey(pkey)
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request.sign(pkey=pkey, md=SIGN_DIGEST)
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cert = M2Crypto.X509.X509()
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## always create a unique version number
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cert.set_version(0)
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cert.set_serial_number(long(time.time()))
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cert.set_pubkey(pkey)
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cert.set_not_before(asn_time1)
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cert.set_not_after(asn_time2)
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cert.set_subject_name(request.get_subject())
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cert.set_issuer_name(issuer)
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cert.sign(pkey, SIGN_DIGEST)
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result = ""
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result += cert.as_pem()
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result += pkey.as_pem(cipher=None)
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return result
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