def negotiate_e2e(self, sigmai):
self.negotiated = {}
request = xmpp.Message()
feature = request.NT.feature
feature.setNamespace(xmpp.NS_FEATURE)
x = xmpp.DataForm(typ="form")
x.addChild(node=xmpp.DataField(name="FORM_TYPE", value="urn:xmpp:ssn", typ="hidden"))
x.addChild(node=xmpp.DataField(name="accept", value="1", typ="boolean", required=True))
# this field is incorrectly called 'otr' in XEPs 0116 and 0217
x.addChild(
node=xmpp.DataField(name="logging", typ="list-single", options=self.logging_preference(), required=True)
)
# unsupported options: 'disabled', 'enabled'
x.addChild(node=xmpp.DataField(name="disclosure", typ="list-single", options=["never"], required=True))
x.addChild(node=xmpp.DataField(name="security", typ="list-single", options=["e2e"], required=True))
x.addChild(node=xmpp.DataField(name="crypt_algs", value="aes128-ctr", typ="hidden"))
x.addChild(node=xmpp.DataField(name="hash_algs", value="sha256", typ="hidden"))
x.addChild(node=xmpp.DataField(name="compress", value="none", typ="hidden"))
# unsupported options: 'iq', 'presence'
x.addChild(node=xmpp.DataField(name="stanzas", typ="list-multi", options=["message"]))
x.addChild(node=xmpp.DataField(name="init_pubkey", options=["none", "key", "hash"], typ="list-single"))
# XXX store key, use hash
x.addChild(node=xmpp.DataField(name="resp_pubkey", options=["none", "key"], typ="list-single"))
x.addChild(node=xmpp.DataField(name="ver", value="1.0", typ="hidden"))
x.addChild(node=xmpp.DataField(name="rekey_freq", value="4294967295", typ="hidden"))
x.addChild(node=xmpp.DataField(name="sas_algs", value="sas28x5", typ="hidden"))
x.addChild(
node=xmpp.DataField(name="sign_algs", value="http://www.w3.org/2000/09/xmldsig#rsa-sha256", typ="hidden")
)
self.n_s = crypto.generate_nonce()
x.addChild(node=xmpp.DataField(name="my_nonce", value=base64.b64encode(self.n_s), typ="hidden"))
modp_options = [int(g) for g in gajim.config.get("esession_modp").split(",")]
x.addChild(node=xmpp.DataField(name="modp", typ="list-single", options=map(lambda x: [None, x], modp_options)))
x.addChild(node=self.make_dhfield(modp_options, sigmai))
self.sigmai = sigmai
self.form_s = "".join(map(lambda el: xmpp.c14n.c14n(el), x.getChildren()))
feature.addChild(node=x)
self.status = "requested-e2e"
self.send(request)
def respond_e2e_bob(self, form, negotiated, not_acceptable):
response = xmpp.Message()
feature = response.NT.feature
feature.setNamespace(xmpp.NS_FEATURE)
x = xmpp.DataForm(typ='submit')
x.addChild(node=xmpp.DataField(name='FORM_TYPE', value='urn:xmpp:ssn'))
x.addChild(node=xmpp.DataField(name='accept', value='true'))
for name in negotiated:
# some fields are internal and should not be sent
if not name in ('send_pubkey', 'recv_pubkey'):
x.addChild(
node=xmpp.DataField(name=name, value=negotiated[name]))
self.negotiated = negotiated
# the offset of the group we chose (need it to match up with the dhhash)
group_order = 0
self.modp = int(form.getField('modp').getOptions()[group_order][1])
x.addChild(node=xmpp.DataField(name='modp', value=self.modp))
g = dh.generators[self.modp]
p = dh.primes[self.modp]
self.n_o = base64.b64decode(form['my_nonce'])
dhhashes = form.getField('dhhashes').getValues()
self.negotiated['He'] = base64.b64decode(
dhhashes[group_order].encode('utf8'))
bytes = int(self.n / 8)
self.n_s = crypto.generate_nonce()
# n-bit random number
self.c_o = crypto.decode_mpi(crypto.random_bytes(bytes))
self.c_s = self.c_o ^ (2**(self.n - 1))
self.y = crypto.srand(2**(2 * self.n - 1), p - 1)
self.d = crypto.powmod(g, self.y, p)
to_add = {
'my_nonce': self.n_s,
'dhkeys': crypto.encode_mpi(self.d),
'counter': crypto.encode_mpi(self.c_o),
'nonce': self.n_o
}
for name in to_add:
b64ed = base64.b64encode(to_add[name])
x.addChild(node=xmpp.DataField(name=name, value=b64ed))
self.form_o = ''.join(
map(lambda el: xmpp.c14n.c14n(el), form.getChildren()))
self.form_s = ''.join(
map(lambda el: xmpp.c14n.c14n(el), x.getChildren()))
self.status = 'responded-e2e'
feature.addChild(node=x)
if not_acceptable:
response = xmpp.Error(response, xmpp.ERR_NOT_ACCEPTABLE)
feature = xmpp.Node(xmpp.NS_FEATURE + ' feature')
for f in not_acceptable:
n = xmpp.Node('field')
n['var'] = f
feature.addChild(node=n)
response.T.error.addChild(node=feature)
self.send(response)
def negotiate_e2e(self, sigmai):
self.negotiated = {}
request = xmpp.Message()
feature = request.NT.feature
feature.setNamespace(xmpp.NS_FEATURE)
x = xmpp.DataForm(typ='form')
x.addChild(node=xmpp.DataField(
name='FORM_TYPE', value='urn:xmpp:ssn', typ='hidden'))
x.addChild(node=xmpp.DataField(
name='accept', value='1', typ='boolean', required=True))
# this field is incorrectly called 'otr' in XEPs 0116 and 0217
x.addChild(node=xmpp.DataField(name='logging',
typ='list-single',
options=self.logging_preference(),
required=True))
# unsupported options: 'disabled', 'enabled'
x.addChild(node=xmpp.DataField(name='disclosure',
typ='list-single',
options=['never'],
required=True))
x.addChild(node=xmpp.DataField(
name='security', typ='list-single', options=['e2e'
], required=True))
x.addChild(node=xmpp.DataField(
name='crypt_algs', value='aes128-ctr', typ='hidden'))
x.addChild(node=xmpp.DataField(
name='hash_algs', value='sha256', typ='hidden'))
x.addChild(
node=xmpp.DataField(name='compress', value='none', typ='hidden'))
# unsupported options: 'iq', 'presence'
x.addChild(node=xmpp.DataField(
name='stanzas', typ='list-multi', options=['message']))
x.addChild(node=xmpp.DataField(name='init_pubkey',
options=['none', 'key', 'hash'],
typ='list-single'))
# XXX store key, use hash
x.addChild(node=xmpp.DataField(
name='resp_pubkey', options=['none', 'key'], typ='list-single'))
x.addChild(node=xmpp.DataField(name='ver', value='1.0', typ='hidden'))
x.addChild(node=xmpp.DataField(
name='rekey_freq', value='4294967295', typ='hidden'))
x.addChild(node=xmpp.DataField(
name='sas_algs', value='sas28x5', typ='hidden'))
x.addChild(node=xmpp.DataField(
name='sign_algs',
value='http://www.w3.org/2000/09/xmldsig#rsa-sha256',
typ='hidden'))
self.n_s = crypto.generate_nonce()
x.addChild(node=xmpp.DataField(
name='my_nonce', value=base64.b64encode(self.n_s), typ='hidden'))
modp_options = [
int(g) for g in gajim.config.get('esession_modp').split(',')
]
x.addChild(node=xmpp.DataField(name='modp',
typ='list-single',
options=map(lambda x: [None, x],
modp_options)))
x.addChild(node=self.make_dhfield(modp_options, sigmai))
self.sigmai = sigmai
self.form_s = ''.join(
map(lambda el: xmpp.c14n.c14n(el), x.getChildren()))
feature.addChild(node=x)
self.status = 'requested-e2e'
self.send(request)
def respond_e2e_bob(self, form, negotiated, not_acceptable):
"""
4.3 esession response (bob)
"""
response = nbxmpp.Message()
feature = response.NT.feature
feature.setNamespace(nbxmpp.NS_FEATURE)
x = nbxmpp.DataForm(typ='submit')
x.addChild(node=nbxmpp.DataField(name='FORM_TYPE',
value='urn:xmpp:ssn'))
x.addChild(node=nbxmpp.DataField(name='accept', value='true'))
for name in negotiated:
# some fields are internal and should not be sent
if not name in ('send_pubkey', 'recv_pubkey'):
x.addChild(node=nbxmpp.DataField(name=name,
value=negotiated[name]))
self.negotiated = negotiated
# the offset of the group we chose (need it to match up with the dhhash)
group_order = 0
modp_f = form.getField('modp')
if not modp_f:
return
self.modp = int(modp_f.getOptions()[group_order][1])
x.addChild(node=nbxmpp.DataField(name='modp', value=self.modp))
g = dh.generators[self.modp]
p = dh.primes[self.modp]
self.n_o = base64.b64decode(form['my_nonce'])
dhhashes_f = form.getField('dhhashes')
if not dhhashes_f:
return
dhhashes = dhhashes_f.getValues()
self.negotiated['He'] = base64.b64decode(dhhashes[group_order].encode(
'utf8'))
bytes = int(self.n / 8)
self.n_s = crypto.generate_nonce()
# n-bit random number
self.c_o = crypto.decode_mpi(crypto.random_bytes(bytes))
self.c_s = self.c_o ^ (2 ** (self.n - 1))
self.y = crypto.srand(2 ** (2 * self.n - 1), p - 1)
self.d = crypto.powmod(g, self.y, p)
to_add = {'my_nonce': self.n_s,
'dhkeys': crypto.encode_mpi(self.d),
'counter': crypto.encode_mpi(self.c_o),
'nonce': self.n_o}
for name in to_add:
b64ed = base64.b64encode(to_add[name])
x.addChild(node=nbxmpp.DataField(name=name, value=b64ed))
self.form_o = ''.join(nbxmpp.c14n.c14n(el, self._is_buggy_gajim()) for \
el in form.getChildren())
self.form_s = ''.join(nbxmpp.c14n.c14n(el, self._is_buggy_gajim()) for \
el in x.getChildren())
self.status = 'responded-e2e'
feature.addChild(node=x)
if not_acceptable:
response = nbxmpp.Error(response, nbxmpp.ERR_NOT_ACCEPTABLE)
feature = nbxmpp.Node(nbxmpp.NS_FEATURE + ' feature')
for f in not_acceptable:
n = nbxmpp.Node('field')
n['var'] = f
feature.addChild(node=n)
response.T.error.addChild(node=feature)
self.send(response)
def negotiate_e2e(self, sigmai):
self.negotiated = {}
request = nbxmpp.Message()
feature = request.NT.feature
feature.setNamespace(nbxmpp.NS_FEATURE)
x = nbxmpp.DataForm(typ='form')
x.addChild(node=nbxmpp.DataField(name='FORM_TYPE', value='urn:xmpp:ssn',
typ='hidden'))
x.addChild(node=nbxmpp.DataField(name='accept', value='1',
typ='boolean', required=True))
# this field is incorrectly called 'otr' in XEPs 0116 and 0217
x.addChild(node=nbxmpp.DataField(name='logging', typ='list-single',
options=self.logging_preference(), required=True))
# unsupported options: 'disabled', 'enabled'
x.addChild(node=nbxmpp.DataField(name='disclosure', typ='list-single',
options=['never'], required=True))
x.addChild(node=nbxmpp.DataField(name='security', typ='list-single',
options=['e2e'], required=True))
x.addChild(node=nbxmpp.DataField(name='crypt_algs', value='aes128-ctr',
typ='hidden'))
x.addChild(node=nbxmpp.DataField(name='hash_algs', value='sha256',
typ='hidden'))
x.addChild(node=nbxmpp.DataField(name='compress', value='none',
typ='hidden'))
# unsupported options: 'iq', 'presence'
x.addChild(node=nbxmpp.DataField(name='stanzas', typ='list-multi',
options=['message']))
x.addChild(node=nbxmpp.DataField(name='init_pubkey', options=['none',
'key', 'hash'], typ='list-single'))
# FIXME store key, use hash
x.addChild(node=nbxmpp.DataField(name='resp_pubkey', options=['none',
'key'], typ='list-single'))
x.addChild(node=nbxmpp.DataField(name='ver', value='1.0', typ='hidden'))
x.addChild(node=nbxmpp.DataField(name='rekey_freq', value='4294967295',
typ='hidden'))
x.addChild(node=nbxmpp.DataField(name='sas_algs', value='sas28x5',
typ='hidden'))
x.addChild(node=nbxmpp.DataField(name='sign_algs',
value='http://www.w3.org/2000/09/xmldsig#rsa-sha256', typ='hidden'))
self.n_s = crypto.generate_nonce()
x.addChild(node=nbxmpp.DataField(name='my_nonce',
value=base64.b64encode(self.n_s), typ='hidden'))
modp_options = [ int(g) for g in gajim.config.get('esession_modp').split(
',') ]
x.addChild(node=nbxmpp.DataField(name='modp', typ='list-single',
options=[[None, y] for y in modp_options]))
x.addChild(node=self.make_dhfield(modp_options, sigmai))
self.sigmai = sigmai
self.form_s = ''.join(nbxmpp.c14n.c14n(el, self._is_buggy_gajim()) for \
el in x.getChildren())
feature.addChild(node=x)
self.status = 'requested-e2e'
self.send(request)
def respond_e2e_bob(self, form, negotiated, not_acceptable):
response = xmpp.Message()
feature = response.NT.feature
feature.setNamespace(xmpp.NS_FEATURE)
x = xmpp.DataForm(typ="submit")
x.addChild(node=xmpp.DataField(name="FORM_TYPE", value="urn:xmpp:ssn"))
x.addChild(node=xmpp.DataField(name="accept", value="true"))
for name in negotiated:
# some fields are internal and should not be sent
if not name in ("send_pubkey", "recv_pubkey"):
x.addChild(node=xmpp.DataField(name=name, value=negotiated[name]))
self.negotiated = negotiated
# the offset of the group we chose (need it to match up with the dhhash)
group_order = 0
self.modp = int(form.getField("modp").getOptions()[group_order][1])
x.addChild(node=xmpp.DataField(name="modp", value=self.modp))
g = dh.generators[self.modp]
p = dh.primes[self.modp]
self.n_o = base64.b64decode(form["my_nonce"])
dhhashes = form.getField("dhhashes").getValues()
self.negotiated["He"] = base64.b64decode(dhhashes[group_order].encode("utf8"))
bytes = int(self.n / 8)
self.n_s = crypto.generate_nonce()
# n-bit random number
self.c_o = crypto.decode_mpi(crypto.random_bytes(bytes))
self.c_s = self.c_o ^ (2 ** (self.n - 1))
self.y = crypto.srand(2 ** (2 * self.n - 1), p - 1)
self.d = crypto.powmod(g, self.y, p)
to_add = {
"my_nonce": self.n_s,
"dhkeys": crypto.encode_mpi(self.d),
"counter": crypto.encode_mpi(self.c_o),
"nonce": self.n_o,
}
for name in to_add:
b64ed = base64.b64encode(to_add[name])
x.addChild(node=xmpp.DataField(name=name, value=b64ed))
self.form_o = "".join(map(lambda el: xmpp.c14n.c14n(el), form.getChildren()))
self.form_s = "".join(map(lambda el: xmpp.c14n.c14n(el), x.getChildren()))
self.status = "responded-e2e"
feature.addChild(node=x)
if not_acceptable:
response = xmpp.Error(response, xmpp.ERR_NOT_ACCEPTABLE)
feature = xmpp.Node(xmpp.NS_FEATURE + " feature")
for f in not_acceptable:
n = xmpp.Node("field")
n["var"] = f
feature.addChild(node=n)
response.T.error.addChild(node=feature)
self.send(response)
