view sat/plugins/plugin_xep_0077.py @ 3162:b5c058c7692e

core (xmpp), plugin android: fixed DNS, SRV handling on Android: Android doesn't have a "/etc/resolv.conf" that Twisted expect. As a result, SRV records can't be checked correctly on connection. To work around that, DNS servers used on Android are checked when necessary (on Android plugin startup and on connectivity change), using some hacks, and Twisted is patched to use them.
author Goffi <goffi@goffi.org>
date Sun, 09 Feb 2020 23:56:42 +0100
parents 559a625a236b
children 2cd54c72fae4
line wrap: on
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#!/usr/bin/env python3


# SAT plugin for managing xep-0077
# Copyright (C) 2009-2020 Jérôme Poisson (goffi@goffi.org)

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero 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 Affero General Public License for more details.

# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

from sat.core.i18n import _
from sat.core.constants import Const as C
from sat.core import exceptions
from sat.core.log import getLogger

log = getLogger(__name__)
from twisted.words.protocols.jabber import jid, xmlstream, client, error as jabber_error
from twisted.internet import defer, reactor
from sat.tools import xml_tools

from wokkel import data_form

NS_REG = "jabber:iq:register"

PLUGIN_INFO = {
    C.PI_NAME: "XEP 0077 Plugin",
    C.PI_IMPORT_NAME: "XEP-0077",
    C.PI_TYPE: "XEP",
    C.PI_PROTOCOLS: ["XEP-0077"],
    C.PI_DEPENDENCIES: [],
    C.PI_MAIN: "XEP_0077",
    C.PI_DESCRIPTION: _("""Implementation of in-band registration"""),
}

# FIXME: this implementation is incomplete


class RegisteringAuthenticator(xmlstream.ConnectAuthenticator):
    # FIXME: request IQ is not send to check available fields,
    #        while XEP recommand to use it
    # FIXME: doesn't handle data form or oob
    namespace = 'jabber:client'

    def __init__(self, jid_, password, email=None, check_certificate=True):
        log.debug(_("Registration asked for {jid}").format(jid=jid_))
        xmlstream.ConnectAuthenticator.__init__(self, jid_.host)
        self.jid = jid_
        self.password = password
        self.email = email
        self.check_certificate = check_certificate
        self.registered = defer.Deferred()

    def associateWithStream(self, xs):
        xmlstream.ConnectAuthenticator.associateWithStream(self, xs)
        xs.addObserver(xmlstream.STREAM_AUTHD_EVENT, self.register)

        xs.initializers = [client.CheckVersionInitializer(xs)]
        tls_init = xmlstream.TLSInitiatingInitializer(xs)
        tls_init.required = False
        tls_init.check_certificate = self.check_certificate
        xs.initializers.append(tls_init)

    def register(self, xmlstream):
        log.debug(_("Stream started with {server}, now registering"
                    .format(server=self.jid.host)))
        iq = XEP_0077.buildRegisterIQ(self.xmlstream, self.jid, self.password, self.email)
        d = iq.send(self.jid.host).addCallbacks(self.registrationCb, self.registrationEb)
        d.chainDeferred(self.registered)

    def registrationCb(self, answer):
        log.debug(_("Registration answer: {}").format(answer.toXml()))
        self.xmlstream.sendFooter()

    def registrationEb(self, failure_):
        log.info(_("Registration failure: {}").format(str(failure_.value)))
        self.xmlstream.sendFooter()
        raise failure_


class ServerRegister(xmlstream.XmlStreamFactory):

    def __init__(self, *args, **kwargs):
        xmlstream.XmlStreamFactory.__init__(self, *args, **kwargs)
        self.addBootstrap(xmlstream.STREAM_END_EVENT, self._disconnected)

    def clientConnectionLost(self, connector, reason):
        connector.disconnect()

    def _disconnected(self, reason):
        if not self.authenticator.registered.called:
            err = jabber_error.StreamError("Server unexpectedly closed the connection")
            try:
                if reason.value.args[0][0][2] == "certificate verify failed":
                    err = exceptions.InvalidCertificate()
            except (IndexError, TypeError):
                pass
            self.authenticator.registered.errback(err)


class XEP_0077(object):
    def __init__(self, host):
        log.info(_("Plugin XEP_0077 initialization"))
        self.host = host
        host.bridge.addMethod(
            "inBandRegister",
            ".plugin",
            in_sign="ss",
            out_sign="",
            method=self._inBandRegister,
            async_=True,
        )
        host.bridge.addMethod(
            "inBandAccountNew",
            ".plugin",
            in_sign="ssssi",
            out_sign="",
            method=self._registerNewAccount,
            async_=True,
        )
        host.bridge.addMethod(
            "inBandUnregister",
            ".plugin",
            in_sign="ss",
            out_sign="",
            method=self._unregister,
            async_=True,
        )
        host.bridge.addMethod(
            "inBandPasswordChange",
            ".plugin",
            in_sign="ss",
            out_sign="",
            method=self._changePassword,
            async_=True,
        )

    @staticmethod
    def buildRegisterIQ(xmlstream_, jid_, password, email=None):
        iq_elt = xmlstream.IQ(xmlstream_, "set")
        iq_elt["to"] = jid_.host
        query_elt = iq_elt.addElement(("jabber:iq:register", "query"))
        username_elt = query_elt.addElement("username")
        username_elt.addContent(jid_.user)
        password_elt = query_elt.addElement("password")
        password_elt.addContent(password)
        if email is not None:
            email_elt = query_elt.addElement("email")
            email_elt.addContent(email)
        return iq_elt

    def _regCb(self, answer, client, post_treat_cb):
        """Called after the first get IQ"""
        try:
            query_elt = next(answer.elements(NS_REG, "query"))
        except StopIteration:
            raise exceptions.DataError("Can't find expected query element")

        try:
            x_elem = next(query_elt.elements(data_form.NS_X_DATA, "x"))
        except StopIteration:
            # XXX: it seems we have an old service which doesn't manage data forms
            log.warning(_("Can't find data form"))
            raise exceptions.DataError(
                _("This gateway can't be managed by SàT, sorry :(")
            )

        def submitForm(data, profile):
            form_elt = xml_tools.XMLUIResultToElt(data)

            iq_elt = client.IQ()
            iq_elt["id"] = answer["id"]
            iq_elt["to"] = answer["from"]
            query_elt = iq_elt.addElement("query", NS_REG)
            query_elt.addChild(form_elt)
            d = iq_elt.send()
            d.addCallback(self._regSuccess, client, post_treat_cb)
            d.addErrback(self._regFailure, client)
            return d

        form = data_form.Form.fromElement(x_elem)
        submit_reg_id = self.host.registerCallback(
            submitForm, with_data=True, one_shot=True
        )
        return xml_tools.dataForm2XMLUI(form, submit_reg_id)

    def _regEb(self, failure, client):
        """Called when something is wrong with registration"""
        log.info(_("Registration failure: %s") % str(failure.value))
        raise failure

    def _regSuccess(self, answer, client, post_treat_cb):
        log.debug(_("registration answer: %s") % answer.toXml())
        if post_treat_cb is not None:
            post_treat_cb(jid.JID(answer["from"]), client.profile)
        return {}

    def _regFailure(self, failure, client):
        log.info(_("Registration failure: %s") % str(failure.value))
        if failure.value.condition == "conflict":
            raise exceptions.ConflictError(
                _("Username already exists, please choose an other one")
            )
        raise failure

    def _inBandRegister(self, to_jid_s, profile_key=C.PROF_KEY_NONE):
        return self.inBandRegister, jid.JID(to_jid_s, profile_key)

    def inBandRegister(self, to_jid, post_treat_cb=None, profile_key=C.PROF_KEY_NONE):
        """register to a service

        @param to_jid(jid.JID): jid of the service to register to
        """
        # FIXME: this post_treat_cb arguments seems wrong, check it
        client = self.host.getClient(profile_key)
        log.debug(_("Asking registration for {}").format(to_jid.full()))
        reg_request = client.IQ("get")
        reg_request["from"] = client.jid.full()
        reg_request["to"] = to_jid.full()
        reg_request.addElement("query", NS_REG)
        d = reg_request.send(to_jid.full()).addCallbacks(
            self._regCb,
            self._regEb,
            callbackArgs=[client, post_treat_cb],
            errbackArgs=[client],
        )
        return d

    def _registerNewAccount(self, jid_, password, email, host, port):
        kwargs = {}
        if email:
            kwargs["email"] = email
        if host:
            kwargs["host"] = host
        if port:
            kwargs["port"] = port
        return self.registerNewAccount(jid.JID(jid_), password, **kwargs)

    def registerNewAccount(
        self, jid_, password, email=None, host="127.0.0.1", port=C.XMPP_C2S_PORT
    ):
        """register a new account on a XMPP server

        @param jid_(jid.JID): request jid to register
        @param password(unicode): password of the account
        @param email(unicode): email of the account
        @param host(unicode): host of the server to register to
        @param port(int): port of the server to register to
        """
        check_certificate = host != "127.0.0.1"
        authenticator = RegisteringAuthenticator(
            jid_, password, email, check_certificate=check_certificate)
        registered_d = authenticator.registered
        server_register = ServerRegister(authenticator)
        reactor.connectTCP(host, port, server_register)
        return registered_d

    def _changePassword(self, new_password, profile_key):
        client = self.host.getClient(profile_key)
        return self.changePassword(client, new_password)

    def changePassword(self, client, new_password):
        iq_elt = self.buildRegisterIQ(client.xmlstream, client.jid, new_password)
        d = iq_elt.send(client.jid.host)
        d.addCallback(
            lambda __: self.host.memory.setParam(
                "Password", new_password, "Connection", profile_key=client.profile
            )
        )
        return d

    def _unregister(self, to_jid_s, profile_key):
        client = self.host.getClient(profile_key)
        return self.unregister(client, jid.JID(to_jid_s))

    def unregister(self, client, to_jid):
        """remove registration from a server/service

        BEWARE! if you remove registration from profile own server, this will
        DELETE THE XMPP ACCOUNT WITHOUT WARNING
        @param to_jid(jid.JID): jid of the service or server
        """
        iq_elt = client.IQ()
        iq_elt["to"] = to_jid.full()
        query_elt = iq_elt.addElement((NS_REG, "query"))
        query_elt.addElement("remove")
        return iq_elt.send()