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# -*- coding:utf-8 -*-
## src/common/jingle_xtls.py
##
## This file is part of Gajim.
##
## Gajim 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; version 3 only.
##
## Gajim 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 Gajim. If not, see <http://www.gnu.org/licenses/>.
##
import os
import logging
import common
from common import gajim
log = logging.getLogger('gajim.c.jingle_xtls')
PYOPENSSL_PRESENT = False
pending_contents = {} # key-exchange id -> session, accept that session once key-exchange completes
def key_exchange_pend(id_, content):
pending_contents[id_] = content
def approve_pending_content(id_):
content = pending_contents[id_]
content.session.approve_session()
content.session.approve_content('file', name=content.name)
try:
import OpenSSL.SSL
PYOPENSSL_PRESENT = True
except ImportError:
log.info("PyOpenSSL not available")
if PYOPENSSL_PRESENT:
from OpenSSL import SSL
from OpenSSL.SSL import Context
from OpenSSL import crypto
TYPE_RSA = crypto.TYPE_RSA
TYPE_DSA = crypto.TYPE_DSA
SELF_SIGNED_CERTIFICATE = 'localcert'
def default_callback(connection, certificate, error_num, depth, return_code):
log.info("certificate: %s" % certificate)
return return_code
def load_cert_file(cert_path, cert_store):
"""
This is almost identical to the one in common.xmpp.tls_nb
"""
if not os.path.isfile(cert_path):
return
try:
f = open(cert_path)
except IOError, e:
log.warning('Unable to open certificate file %s: %s' % (cert_path,
str(e)))
return
lines = f.readlines()
i = 0
begin = -1
for line in lines:
if 'BEGIN CERTIFICATE' in line:
begin = i
elif 'END CERTIFICATE' in line and begin > -1:
cert = ''.join(lines[begin:i+2])
try:
x509cert = OpenSSL.crypto.load_certificate(
OpenSSL.crypto.FILETYPE_PEM, cert)
cert_store.add_cert(x509cert)
except OpenSSL.crypto.Error, exception_obj:
log.warning('Unable to load a certificate from file %s: %s' %\
(cert_path, exception_obj.args[0][0][2]))
except:
log.warning('Unknown error while loading certificate from file '
'%s' % cert_path)
begin = -1
i += 1
def get_context(fingerprint, verify_cb=None):
"""
constructs and returns the context objects
"""
ctx = SSL.Context(SSL.TLSv1_METHOD)
if fingerprint == 'server': # for testing purposes only
ctx.set_verify(SSL.VERIFY_NONE|SSL.VERIFY_FAIL_IF_NO_PEER_CERT,
verify_cb or default_callback)
elif fingerprint == 'client':
ctx.set_verify(SSL.VERIFY_PEER, verify_cb or default_callback)
cert_name = os.path.join(gajim.MY_CERT_DIR, SELF_SIGNED_CERTIFICATE)
ctx.use_privatekey_file (cert_name + '.pkey')
ctx.use_certificate_file(cert_name + '.cert')
store = ctx.get_cert_store()
for f in os.listdir(os.path.expanduser(gajim.MY_PEER_CERTS_PATH)):
load_cert_file(os.path.join(os.path.expanduser(
gajim.MY_PEER_CERTS_PATH), f), store)
log.debug('certificate file ' + f + ' loaded fingerprint ' + \
fingerprint)
return ctx
def send_cert(con, jid_from, sid):
certpath = os.path.join(gajim.MY_CERT_DIR, SELF_SIGNED_CERTIFICATE) + \
'.cert'
certfile = open(certpath, 'r')
certificate = ''
for line in certfile.readlines():
if not line.startswith('-'):
certificate += line
iq = common.xmpp.Iq('result', to=jid_from);
iq.setAttr('id', sid)
pubkey = iq.setTag('pubkeys')
pubkey.setNamespace(common.xmpp.NS_PUBKEY_PUBKEY)
keyinfo = pubkey.setTag('keyinfo')
name = keyinfo.setTag('name')
name.setData('CertificateHash')
cert = keyinfo.setTag('x509cert')
cert.setData(certificate)
con.send(iq)
def handle_new_cert(con, obj, jid_from):
jid = gajim.get_jid_without_resource(jid_from)
certpath = os.path.join(os.path.expanduser(gajim.MY_PEER_CERTS_PATH), jid)
certpath += '.cert'
id_ = obj.getAttr('id')
x509cert = obj.getTag('pubkeys').getTag('keyinfo').getTag('x509cert')
cert = x509cert.getData()
f = open(certpath, 'w')
f.write('-----BEGIN CERTIFICATE-----\n')
f.write(cert)
f.write('-----END CERTIFICATE-----\n')
approve_pending_content(id_)
def send_cert_request(con, to_jid):
iq = common.xmpp.Iq('get', to=to_jid)
id_ = con.connection.getAnID()
iq.setAttr('id', id_)
pubkey = iq.setTag('pubkeys')
pubkey.setNamespace(common.xmpp.NS_PUBKEY_PUBKEY)
con.connection.send(iq)
return unicode(id_)
# the following code is partly due to pyopenssl examples
def createKeyPair(type, bits):
"""
Create a public/private key pair.
Arguments: type - Key type, must be one of TYPE_RSA and TYPE_DSA
bits - Number of bits to use in the key
Returns: The public/private key pair in a PKey object
"""
pkey = crypto.PKey()
pkey.generate_key(type, bits)
return pkey
def createCertRequest(pkey, digest="md5", **name):
"""
Create a certificate request.
Arguments: pkey - The key to associate with the request
digest - Digestion method to use for signing, default is md5
**name - The name of the subject of the request, possible
arguments are:
C - Country name
ST - State or province name
L - Locality name
O - Organization name
OU - Organizational unit name
CN - Common name
emailAddress - E-mail address
Returns: The certificate request in an X509Req object
"""
req = crypto.X509Req()
subj = req.get_subject()
for (key,value) in name.items():
setattr(subj, key, value)
req.set_pubkey(pkey)
req.sign(pkey, digest)
return req
def createCertificate(req, (issuerCert, issuerKey), serial, (notBefore, notAfter), digest="md5"):
"""
Generate a certificate given a certificate request.
Arguments: req - Certificate reqeust to use
issuerCert - The certificate of the issuer
issuerKey - The private key of the issuer
serial - Serial number for the certificate
notBefore - Timestamp (relative to now) when the certificate
starts being valid
notAfter - Timestamp (relative to now) when the certificate
stops being valid
digest - Digest method to use for signing, default is md5
Returns: The signed certificate in an X509 object
"""
cert = crypto.X509()
cert.set_serial_number(serial)
cert.gmtime_adj_notBefore(notBefore)
cert.gmtime_adj_notAfter(notAfter)
cert.set_issuer(issuerCert.get_subject())
cert.set_subject(req.get_subject())
cert.set_pubkey(req.get_pubkey())
cert.sign(issuerKey, digest)
return cert
def make_certs(filepath, CN):
"""
make self signed certificates
filepath : absolute path of certificate file, will be appended the '.pkey'
and '.cert' extensions
CN : common name
"""
key = createKeyPair(TYPE_RSA, 1024)
req = createCertRequest(key, CN=CN)
cert = createCertificate(req, (req, key), 0, (0, 60*60*24*365*5)) # five years
open(filepath + '.pkey', 'w').write(crypto.dump_privatekey(
crypto.FILETYPE_PEM, key))
open(filepath + '.cert', 'w').write(crypto.dump_certificate(
crypto.FILETYPE_PEM, cert))
if __name__ == '__main__':
make_certs('./selfcert', 'gajim')
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