password-reset: improved error reporting for captch and empty email

rhodecode/login/views.py

@@ -1,390 +1,400
 # -*- coding: utf-8 -*-
 
 # Copyright (C) 2016-2017 RhodeCode GmbH
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU Affero General Public License, version 3
 # (only), as published by the Free Software Foundation.
 #
 # 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 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/>.
 #
 # This program is dual-licensed. If you wish to learn more about the
 # RhodeCode Enterprise Edition, including its added features, Support services,
 # and proprietary license terms, please see https://rhodecode.com/licenses/
 
 import time
 import collections
 import datetime
 import formencode
 import logging
 import urlparse
 
 from pylons import url
 from pyramid.httpexceptions import HTTPFound
 from pyramid.view import view_config
 from recaptcha.client.captcha import submit
 
 from rhodecode.authentication.base import authenticate, HTTP_TYPE
 from rhodecode.events import UserRegistered
 from rhodecode.lib import helpers as h
 from rhodecode.lib.auth import (
     AuthUser, HasPermissionAnyDecorator, CSRFRequired)
 from rhodecode.lib.base import get_ip_addr
 from rhodecode.lib.exceptions import UserCreationError
 from rhodecode.lib.utils2 import safe_str
 from rhodecode.model.db import User, UserApiKeys
 from rhodecode.model.forms import LoginForm, RegisterForm, PasswordResetForm
 from rhodecode.model.meta import Session
 from rhodecode.model.auth_token import AuthTokenModel
 from rhodecode.model.settings import SettingsModel
 from rhodecode.model.user import UserModel
 from rhodecode.translation import _
 
 
 log = logging.getLogger(__name__)
 
 CaptchaData = collections.namedtuple(
     'CaptchaData', 'active, private_key, public_key')
 
 
 def _store_user_in_session(session, username, remember=False):
     user = User.get_by_username(username, case_insensitive=True)
     auth_user = AuthUser(user.user_id)
     auth_user.set_authenticated()
     cs = auth_user.get_cookie_store()
     session['rhodecode_user'] = cs
     user.update_lastlogin()
     Session().commit()
 
     # If they want to be remembered, update the cookie
     if remember:
         _year = (datetime.datetime.now() +
                  datetime.timedelta(seconds=60 * 60 * 24 * 365))
         session._set_cookie_expires(_year)
 
     session.save()
 
     safe_cs = cs.copy()
     safe_cs['password'] = '****'
     log.info('user %s is now authenticated and stored in '
              'session, session attrs %s', username, safe_cs)
 
     # dumps session attrs back to cookie
     session._update_cookie_out()
     # we set new cookie
     headers = None
     if session.request['set_cookie']:
         # send set-cookie headers back to response to update cookie
         headers = [('Set-Cookie', session.request['cookie_out'])]
     return headers
 
 
 def get_came_from(request):
     came_from = safe_str(request.GET.get('came_from', ''))
     parsed = urlparse.urlparse(came_from)
     allowed_schemes = ['http', 'https']
     if parsed.scheme and parsed.scheme not in allowed_schemes:
         log.error('Suspicious URL scheme detected %s for url %s' %
                   (parsed.scheme, parsed))
         came_from = url('home')
     elif parsed.netloc and request.host != parsed.netloc:
         log.error('Suspicious NETLOC detected %s for url %s server url '
                   'is: %s' % (parsed.netloc, parsed, request.host))
         came_from = url('home')
     elif any(bad_str in parsed.path for bad_str in ('\r', '\n')):
         log.error('Header injection detected `%s` for url %s server url ' %
                   (parsed.path, parsed))
         came_from = url('home')
 
     return came_from or url('home')
 
 
 class LoginView(object):
 
     def __init__(self, context, request):
         self.request = request
         self.context = context
         self.session = request.session
         self._rhodecode_user = request.user
 
     def _get_template_context(self):
         return {
             'came_from': get_came_from(self.request),
             'defaults': {},
             'errors': {},
         }
 
     def _get_captcha_data(self):
         settings = SettingsModel().get_all_settings()
         private_key = settings.get('rhodecode_captcha_private_key')
         public_key = settings.get('rhodecode_captcha_public_key')
         active = bool(private_key)
         return CaptchaData(
             active=active, private_key=private_key, public_key=public_key)
 
     @view_config(
         route_name='login', request_method='GET',
         renderer='rhodecode:templates/login.mako')
     def login(self):
         came_from = get_came_from(self.request)
         user = self.request.user
 
         # redirect if already logged in
         if user.is_authenticated and not user.is_default and user.ip_allowed:
             raise HTTPFound(came_from)
 
         # check if we use headers plugin, and try to login using it.
         try:
             log.debug('Running PRE-AUTH for headers based authentication')
             auth_info = authenticate(
                 '', '', self.request.environ, HTTP_TYPE, skip_missing=True)
             if auth_info:
                 headers = _store_user_in_session(
                     self.session, auth_info.get('username'))
                 raise HTTPFound(came_from, headers=headers)
         except UserCreationError as e:
             log.error(e)
             self.session.flash(e, queue='error')
 
         return self._get_template_context()
 
     @view_config(
         route_name='login', request_method='POST',
         renderer='rhodecode:templates/login.mako')
     def login_post(self):
         came_from = get_came_from(self.request)
 
         login_form = LoginForm()()
 
         try:
             self.session.invalidate()
             form_result = login_form.to_python(self.request.params)
             # form checks for username/password, now we're authenticated
             headers = _store_user_in_session(
                 self.session,
                 username=form_result['username'],
                 remember=form_result['remember'])
             log.debug('Redirecting to "%s" after login.', came_from)
             raise HTTPFound(came_from, headers=headers)
         except formencode.Invalid as errors:
             defaults = errors.value
             # remove password from filling in form again
             defaults.pop('password', None)
             render_ctx = self._get_template_context()
             render_ctx.update({
                 'errors': errors.error_dict,
                 'defaults': defaults,
             })
             return render_ctx
 
         except UserCreationError as e:
             # headers auth or other auth functions that create users on
             # the fly can throw this exception signaling that there's issue
             # with user creation, explanation should be provided in
             # Exception itself
             self.session.flash(e, queue='error')
             return self._get_template_context()
 
     @CSRFRequired()
     @view_config(route_name='logout', request_method='POST')
     def logout(self):
         user = self.request.user
         log.info('Deleting session for user: `%s`', user)
         self.session.delete()
         return HTTPFound(url('home'))
 
     @HasPermissionAnyDecorator(
         'hg.admin', 'hg.register.auto_activate', 'hg.register.manual_activate')
     @view_config(
         route_name='register', request_method='GET',
         renderer='rhodecode:templates/register.mako',)
     def register(self, defaults=None, errors=None):
         defaults = defaults or {}
         errors = errors or {}
 
         settings = SettingsModel().get_all_settings()
         register_message = settings.get('rhodecode_register_message') or ''
         captcha = self._get_captcha_data()
         auto_active = 'hg.register.auto_activate' in User.get_default_user()\
             .AuthUser.permissions['global']
 
         render_ctx = self._get_template_context()
         render_ctx.update({
             'defaults': defaults,
             'errors': errors,
             'auto_active': auto_active,
             'captcha_active': captcha.active,
             'captcha_public_key': captcha.public_key,
             'register_message': register_message,
         })
         return render_ctx
 
     @HasPermissionAnyDecorator(
         'hg.admin', 'hg.register.auto_activate', 'hg.register.manual_activate')
     @view_config(
         route_name='register', request_method='POST',
         renderer='rhodecode:templates/register.mako')
     def register_post(self):
         captcha = self._get_captcha_data()
         auto_active = 'hg.register.auto_activate' in User.get_default_user()\
             .AuthUser.permissions['global']
 
         register_form = RegisterForm()()
         try:
             form_result = register_form.to_python(self.request.params)
             form_result['active'] = auto_active
 
             if captcha.active:
                 response = submit(
                     self.request.params.get('recaptcha_challenge_field'),
                     self.request.params.get('recaptcha_response_field'),
                     private_key=captcha.private_key,
                     remoteip=get_ip_addr(self.request.environ))
                 if not response.is_valid:
                     _value = form_result
                     _msg = _('Bad captcha')
                     error_dict = {'recaptcha_field': _msg}
                     raise formencode.Invalid(_msg, _value, None,
                                              error_dict=error_dict)
 
             new_user = UserModel().create_registration(form_result)
             event = UserRegistered(user=new_user, session=self.session)
             self.request.registry.notify(event)
             self.session.flash(
                 _('You have successfully registered with RhodeCode'),
                 queue='success')
             Session().commit()
 
             redirect_ro = self.request.route_path('login')
             raise HTTPFound(redirect_ro)
 
         except formencode.Invalid as errors:
             errors.value.pop('password', None)
             errors.value.pop('password_confirmation', None)
             return self.register(
                 defaults=errors.value, errors=errors.error_dict)
 
         except UserCreationError as e:
             # container auth or other auth functions that create users on
             # the fly can throw this exception signaling that there's issue
             # with user creation, explanation should be provided in
             # Exception itself
             self.session.flash(e, queue='error')
             return self.register()
 
     @view_config(
         route_name='reset_password', request_method=('GET', 'POST'),
         renderer='rhodecode:templates/password_reset.mako')
     def password_reset(self):
         captcha = self._get_captcha_data()
 
         render_ctx = {
             'captcha_active': captcha.active,
             'captcha_public_key': captcha.public_key,
             'defaults': {},
             'errors': {},
         }
 
         # always send implicit message to prevent from discovery of
         # matching emails
         msg = _('If such email exists, a password reset link was sent to it.')
 
         if self.request.POST:
             if h.HasPermissionAny('hg.password_reset.disabled')():
                 _email = self.request.POST.get('email', '')
                 log.error('Failed attempt to reset password for `%s`.', _email)
                 self.session.flash(_('Password reset has been disabled.'),
                                    queue='error')
                 return HTTPFound(self.request.route_path('reset_password'))
 
             password_reset_form = PasswordResetForm()()
             try:
                 form_result = password_reset_form.to_python(
                     self.request.params)
                 user_email = form_result['email']
 
                 if captcha.active:
                     response = submit(
                         self.request.params.get('recaptcha_challenge_field'),
                         self.request.params.get('recaptcha_response_field'),
                         private_key=captcha.private_key,
                         remoteip=get_ip_addr(self.request.environ))
                     if not response.is_valid:
                         _value = form_result
                         _msg = _('Bad captcha')
                         error_dict = {'recaptcha_field': _msg}
                         raise formencode.Invalid(
                             _msg, _value, None, error_dict=error_dict)
+
                 # Generate reset URL and send mail.
                 user = User.get_by_email(user_email)
 
                 # generate password reset token that expires in 10minutes
                 desc = 'Generated token for password reset from {}'.format(
                     datetime.datetime.now().isoformat())
                 reset_token = AuthTokenModel().create(
                     user, lifetime=10,
                     description=desc,
                     role=UserApiKeys.ROLE_PASSWORD_RESET)
                 Session().commit()
 
                 log.debug('Successfully created password recovery token')
                 password_reset_url = self.request.route_url(
                     'reset_password_confirmation',
                     _query={'key': reset_token.api_key})
                 UserModel().reset_password_link(
                     form_result, password_reset_url)
                 # Display success message and redirect.
                 self.session.flash(msg, queue='success')
                 return HTTPFound(self.request.route_path('reset_password'))
 
             except formencode.Invalid as errors:
                 render_ctx.update({
                     'defaults': errors.value,
+                    'errors': errors.error_dict,
                 })
+                if not self.request.params.get('email'):
+                    # case of empty email, we want to report that
+                    return render_ctx
+
+                if 'recaptcha_field' in errors.error_dict:
+                    # case of failed captcha
+                    return render_ctx
+
             log.debug('faking response on invalid password reset')
             # make this take 2s, to prevent brute forcing.
             time.sleep(2)
             self.session.flash(msg, queue='success')
             return HTTPFound(self.request.route_path('reset_password'))
 
         return render_ctx
 
     @view_config(route_name='reset_password_confirmation',
                  request_method='GET')
     def password_reset_confirmation(self):
 
         if self.request.GET and self.request.GET.get('key'):
             # make this take 2s, to prevent brute forcing.
             time.sleep(2)
 
             token = AuthTokenModel().get_auth_token(
                 self.request.GET.get('key'))
 
             # verify token is the correct role
             if token is None or token.role != UserApiKeys.ROLE_PASSWORD_RESET:
                 log.debug('Got token with role:%s expected is %s',
                           getattr(token, 'role', 'EMPTY_TOKEN'),
                           UserApiKeys.ROLE_PASSWORD_RESET)
                 self.session.flash(
                     _('Given reset token is invalid'), queue='error')
                 return HTTPFound(self.request.route_path('reset_password'))
 
             try:
                 owner = token.user
                 data = {'email': owner.email, 'token': token.api_key}
                 UserModel().reset_password(data)
                 self.session.flash(
                     _('Your password reset was successful, '
                       'a new password has been sent to your email'),
                     queue='success')
             except Exception as e:
                 log.error(e)
                 return HTTPFound(self.request.route_path('reset_password'))
 
         return HTTPFound(self.request.route_path('login'))