Adding authorization

Pyramid provides facilities for authentication and authorization. We'll make use of both features to provide security to our application. Our application currently allows anyone with access to the server to view, edit, and add pages to our wiki. We'll change that to allow only people who are members of a group named group:editors to add and edit wiki pages but we'll continue allowing anyone with access to the server to view pages.

We will also add a login page and a logout link on all the pages. The login page will be shown when a user is denied access to any of the views that require permission, instead of a default "403 Forbidden" page.

We will implement the access control with the following steps:

Then we will add the login and logout feature:

  • Add routes for /login and /logout (__init__.py).
  • Add login and logout views (views.py).
  • Add a login template (login.pt).
  • Make the existing views return a logged_in flag to the renderer (views.py).
  • Add a "Logout" link to be shown when logged in and viewing or editing a page (view.pt, edit.pt).

Access control

Add users and groups

Create a new tutorial/tutorial/security.py module with the following content:

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USERS = {'editor':'editor',
          'viewer':'viewer'}
GROUPS = {'editor':['group:editors']}

def groupfinder(userid, request):
    if userid in USERS:
        return GROUPS.get(userid, [])

The groupfinder function accepts a userid and a request and returns one of these values:

  • If the userid exists in the system, it will return a sequence of group identifiers (or an empty sequence if the user isn't a member of any groups).
  • If the userid does not exist in the system, it will return None.

For example, groupfinder('editor', request ) returns ['group:editor'], groupfinder('viewer', request) returns [], and groupfinder('admin', request) returns None. We will use groupfinder() as an authentication policy "callback" that will provide the principal or principals for a user.

In a production system, user and group data will most often come from a database, but here we use "dummy" data to represent user and groups sources.

Add an ACL

Open tutorial/tutorial/models.py and add the following import statement at the head:

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from pyramid.security import (
    Allow,
    Everyone,
    )

Add the following class definition at the end:

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class RootFactory(object):
    __acl__ = [ (Allow, Everyone, 'view'),
                (Allow, 'group:editors', 'edit') ]
    def __init__(self, request):
        pass

We import Allow, an action that means that permission is allowed, and Everyone, a special principal that is associated to all requests. Both are used in the ACE entries that make up the ACL.

The ACL is a list that needs to be named __acl__ and be an attribute of a class. We define an ACL with two ACE entries: the first entry allows any user the view permission. The second entry allows the group:editors principal the edit permission.

The RootFactory class that contains the ACL is a root factory. We need to associate it to our Pyramid application, so the ACL is provided to each view in the context of the request as the context attribute.

Open tutorial/tutorial/__init__.py and add a root_factory parameter to our Configurator constructor, that points to the class we created above:

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    config = Configurator(settings=settings,
                          root_factory='tutorial.models.RootFactory')

Only the highlighted line needs to be added.

We are now providing the ACL to the application. See Assigning ACLs to your Resource Objects for more information about what an ACL represents.

Note

Although we don't use the functionality here, the factory used to create route contexts may differ per-route as opposed to globally. See the factory argument to pyramid.config.Configurator.add_route() for more info.

Add authentication and authorization policies

Open tutorial/tutorial/__init__.py and add the highlighted import statements:

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from pyramid.config import Configurator
from pyramid.authentication import AuthTktAuthenticationPolicy
from pyramid.authorization import ACLAuthorizationPolicy

from sqlalchemy import engine_from_config

from tutorial.security import groupfinder

Now add those policies to the configuration:

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    authn_policy = AuthTktAuthenticationPolicy(
        'sosecret', callback=groupfinder, hashalg='sha512')
    authz_policy = ACLAuthorizationPolicy()
    config = Configurator(settings=settings,
                          root_factory='tutorial.models.RootFactory')
    config.set_authentication_policy(authn_policy)
    config.set_authorization_policy(authz_policy)

Only the highlighted lines need to be added.

We are enabling an AuthTktAuthenticationPolicy, which is based in an auth ticket that may be included in the request. We are also enabling an ACLAuthorizationPolicy, which uses an ACL to determine the allow or deny outcome for a view.

Note that the pyramid.authentication.AuthTktAuthenticationPolicy constructor accepts two arguments: secret and callback. secret is a string representing an encryption key used by the "authentication ticket" machinery represented by this policy: it is required. The callback is the groupfinder() function that we created before.

Add permission declarations

Open tutorial/tutorial/views.py and add a permission='edit' parameter to the @view_config decorators for add_page() and edit_page():

@view_config(route_name='add_page', renderer='templates/edit.pt',
             permission='edit')
@view_config(route_name='edit_page', renderer='templates/edit.pt',
             permission='edit')

Only the highlighted lines, along with their preceding commas, need to be edited and added.

The result is that only users who possess the edit permission at the time of the request may invoke those two views.

Add a permission='view' parameter to the @view_config decorator for view_wiki() and view_page() as follows:

@view_config(route_name='view_wiki',
             permission='view')
@view_config(route_name='view_page', renderer='templates/view.pt',
             permission='view')

Only the highlighted lines, along with their preceding commas, need to be edited and added.

This allows anyone to invoke these two views.

We are done with the changes needed to control access. The changes that follow will add the login and logout feature.

Login, logout

Add routes for /login and /logout

Go back to tutorial/tutorial/__init__.py and add these two routes as highlighted:

    config.add_route('view_wiki', '/')
    config.add_route('login', '/login')
    config.add_route('logout', '/logout')
    config.add_route('view_page', '/{pagename}')

Note

The preceding lines must be added before the following view_page route definition:

    config.add_route('view_page', '/{pagename}')

This is because view_page's route definition uses a catch-all "replacement marker" /{pagename} (see Route Pattern Syntax) which will catch any route that was not already caught by any route listed above it in __init__.py. Hence, for login and logout views to have the opportunity of being matched (or "caught"), they must be above /{pagename}.

Add login and logout views

We'll add a login view which renders a login form and processes the post from the login form, checking credentials.

We'll also add a logout view callable to our application and provide a link to it. This view will clear the credentials of the logged in user and redirect back to the front page.

Add the following import statements to the head of tutorial/tutorial/views.py:

from pyramid.view import (
    view_config,
    forbidden_view_config,
    )

from pyramid.security import (
    remember,
    forget,
    )

from .security import USERS

All the highlighted lines need to be added or edited.

forbidden_view_config() will be used to customize the default 403 Forbidden page. remember() and forget() help to create and expire an auth ticket cookie.

Now add the login and logout views at the end of the file:

@view_config(route_name='login', renderer='templates/login.pt')
@forbidden_view_config(renderer='templates/login.pt')
def login(request):
    login_url = request.route_url('login')
    referrer = request.url
    if referrer == login_url:
        referrer = '/' # never use the login form itself as came_from
    came_from = request.params.get('came_from', referrer)
    message = ''
    login = ''
    password = ''
    if 'form.submitted' in request.params:
        login = request.params['login']
        password = request.params['password']
        if USERS.get(login) == password:
            headers = remember(request, login)
            return HTTPFound(location = came_from,
                             headers = headers)
        message = 'Failed login'

    return dict(
        message = message,
        url = request.application_url + '/login',
        came_from = came_from,
        login = login,
        password = password,
        )

@view_config(route_name='logout')
def logout(request):
    headers = forget(request)
    return HTTPFound(location = request.route_url('view_wiki'),
                     headers = headers)

login() has two decorators:

  • a @view_config decorator which associates it with the login route and makes it visible when we visit /login,
  • a @forbidden_view_config decorator which turns it into a forbidden view. login() will be invoked when a user tries to execute a view callable for which they lack authorization. For example, if a user has not logged in and tries to add or edit a Wiki page, they will be shown the login form before being allowed to continue.

The order of these two view configuration decorators is unimportant.

logout() is decorated with a @view_config decorator which associates it with the logout route. It will be invoked when we visit /logout.

Add the login.pt Template

Create tutorial/tutorial/templates/login.pt with the following content:

<!DOCTYPE html>
<html lang="${request.locale_name}">
  <head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta name="description" content="pyramid web application">
    <meta name="author" content="Pylons Project">
    <link rel="shortcut icon" href="${request.static_url('tutorial:static/pyramid-16x16.png')}">

    <title>Login - Pyramid tutorial wiki (based on
    TurboGears 20-Minute Wiki)</title>

    <!-- Bootstrap core CSS -->
    <link href="//oss.maxcdn.com/libs/twitter-bootstrap/3.0.3/css/bootstrap.min.css" rel="stylesheet">

    <!-- Custom styles for this scaffold -->
    <link href="${request.static_url('tutorial:static/theme.css')}" rel="stylesheet">

    <!-- HTML5 shim and Respond.js IE8 support of HTML5 elements and media queries -->
    <!--[if lt IE 9]>
      <script src="//oss.maxcdn.com/libs/html5shiv/3.7.0/html5shiv.js"></script>
      <script src="//oss.maxcdn.com/libs/respond.js/1.3.0/respond.min.js"></script>
    <![endif]-->
  </head>
  <body>

    <div class="starter-template">
      <div class="container">
        <div class="row">
          <div class="col-md-2">
            <img class="logo img-responsive" src="${request.static_url('tutorial:static/pyramid.png')}" alt="pyramid web framework">
          </div>
          <div class="col-md-10">
            <div class="content">
              <p>
                <strong>
                  Login
                </strong><br>
                <span tal:replace="message"></span>
              </p>
              <form action="${url}" method="post">
                <input type="hidden" name="came_from" value="${came_from}">
                <div class="form-group">
                  <label for="login">Username</label>
                  <input type="text" name="login" value="${login}">
                </div>
                <div class="form-group">
                  <label for="password">Password</label>
                  <input type="password" name="password" value="${password}">
                </div>
                <div class="form-group">
                  <button type="submit" name="form.submitted" value="Log In" class="btn btn-default">Log In</button>
                </div>
              </form>
            </div>
          </div>
        </div>
        <div class="row">
          <div class="copyright">
            Copyright &copy; Pylons Project
          </div>
        </div>
      </div>
    </div>


    <!-- Bootstrap core JavaScript
    ================================================== -->
    <!-- Placed at the end of the document so the pages load faster -->
    <script src="//oss.maxcdn.com/libs/jquery/1.10.2/jquery.min.js"></script>
    <script src="//oss.maxcdn.com/libs/twitter-bootstrap/3.0.3/js/bootstrap.min.js"></script>
  </body>
</html>

The above template is referenced in the login view that we just added in views.py.

Return a logged_in flag to the renderer

Open tutorial/tutorial/views.py again. Add a logged_in parameter to the return value of view_page(), edit_page(), and add_page() as follows:

    return dict(page=page, content=content, edit_url=edit_url,
                logged_in=request.authenticated_userid)
    return dict(page=page, save_url=save_url,
                logged_in=request.authenticated_userid)
    return dict(
        page=page,
        save_url=request.route_url('edit_page', pagename=pagename),
        logged_in=request.authenticated_userid
        )

Only the highlighted lines need to be added or edited.

The pyramid.request.Request.authenticated_userid() will be None if the user is not authenticated, or a userid if the user is authenticated.

Reviewing our changes

Our tutorial/tutorial/__init__.py will look like this when we're done:

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from pyramid.config import Configurator
from pyramid.authentication import AuthTktAuthenticationPolicy
from pyramid.authorization import ACLAuthorizationPolicy

from sqlalchemy import engine_from_config

from tutorial.security import groupfinder

from .models import (
    DBSession,
    Base,
    )


def main(global_config, **settings):
    """ This function returns a Pyramid WSGI application.
    """
    engine = engine_from_config(settings, 'sqlalchemy.')
    DBSession.configure(bind=engine)
    Base.metadata.bind = engine
    authn_policy = AuthTktAuthenticationPolicy(
        'sosecret', callback=groupfinder, hashalg='sha512')
    authz_policy = ACLAuthorizationPolicy()
    config = Configurator(settings=settings,
                          root_factory='tutorial.models.RootFactory')
    config.set_authentication_policy(authn_policy)
    config.set_authorization_policy(authz_policy)
    config.include('pyramid_chameleon')
    config.add_static_view('static', 'static', cache_max_age=3600)
    config.add_route('view_wiki', '/')
    config.add_route('login', '/login')
    config.add_route('logout', '/logout')
    config.add_route('view_page', '/{pagename}')
    config.add_route('add_page', '/add_page/{pagename}')
    config.add_route('edit_page', '/{pagename}/edit_page')
    config.scan()
    return config.make_wsgi_app()

Only the highlighted lines need to be added or edited.

Our tutorial/tutorial/models.py will look like this when we're done:

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from pyramid.security import (
    Allow,
    Everyone,
    )

from sqlalchemy import (
    Column,
    Integer,
    Text,
    )

from sqlalchemy.ext.declarative import declarative_base

from sqlalchemy.orm import (
    scoped_session,
    sessionmaker,
    )

from zope.sqlalchemy import ZopeTransactionExtension

DBSession = scoped_session(sessionmaker(extension=ZopeTransactionExtension()))
Base = declarative_base()


class Page(Base):
    """ The SQLAlchemy declarative model class for a Page object. """
    __tablename__ = 'pages'
    id = Column(Integer, primary_key=True)
    name = Column(Text, unique=True)
    data = Column(Text)


class RootFactory(object):
    __acl__ = [ (Allow, Everyone, 'view'),
                (Allow, 'group:editors', 'edit') ]
    def __init__(self, request):
        pass

Only the highlighted lines need to be added or edited.

Our tutorial/tutorial/views.py will look like this when we're done:

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import re
from docutils.core import publish_parts

from pyramid.httpexceptions import (
    HTTPFound,
    HTTPNotFound,
    )

from pyramid.view import (
    view_config,
    forbidden_view_config,
    )

from pyramid.security import (
    remember,
    forget,
    )

from .security import USERS

from .models import (
    DBSession,
    Page,
    )


# regular expression used to find WikiWords
wikiwords = re.compile(r"\b([A-Z]\w+[A-Z]+\w+)")

@view_config(route_name='view_wiki',
             permission='view')
def view_wiki(request):
    return HTTPFound(location = request.route_url('view_page',
                                                  pagename='FrontPage'))

@view_config(route_name='view_page', renderer='templates/view.pt',
             permission='view')
def view_page(request):
    pagename = request.matchdict['pagename']
    page = DBSession.query(Page).filter_by(name=pagename).first()
    if page is None:
        return HTTPNotFound('No such page')

    def check(match):
        word = match.group(1)
        exists = DBSession.query(Page).filter_by(name=word).all()
        if exists:
            view_url = request.route_url('view_page', pagename=word)
            return '<a href="%s">%s</a>' % (view_url, word)
        else:
            add_url = request.route_url('add_page', pagename=word)
            return '<a href="%s">%s</a>' % (add_url, word)

    content = publish_parts(page.data, writer_name='html')['html_body']
    content = wikiwords.sub(check, content)
    edit_url = request.route_url('edit_page', pagename=pagename)
    return dict(page=page, content=content, edit_url=edit_url,
                logged_in=request.authenticated_userid)

@view_config(route_name='add_page', renderer='templates/edit.pt',
             permission='edit')
def add_page(request):
    pagename = request.matchdict['pagename']
    if 'form.submitted' in request.params:
        body = request.params['body']
        page = Page(name=pagename, data=body)
        DBSession.add(page)
        return HTTPFound(location = request.route_url('view_page',
                                                      pagename=pagename))
    save_url = request.route_url('add_page', pagename=pagename)
    page = Page(name='', data='')
    return dict(page=page, save_url=save_url,
                logged_in=request.authenticated_userid)

@view_config(route_name='edit_page', renderer='templates/edit.pt',
             permission='edit')
def edit_page(request):
    pagename = request.matchdict['pagename']
    page = DBSession.query(Page).filter_by(name=pagename).one()
    if 'form.submitted' in request.params:
        page.data = request.params['body']
        DBSession.add(page)
        return HTTPFound(location = request.route_url('view_page',
                                                      pagename=pagename))
    return dict(
        page=page,
        save_url=request.route_url('edit_page', pagename=pagename),
        logged_in=request.authenticated_userid
        )

@view_config(route_name='login', renderer='templates/login.pt')
@forbidden_view_config(renderer='templates/login.pt')
def login(request):
    login_url = request.route_url('login')
    referrer = request.url
    if referrer == login_url:
        referrer = '/' # never use the login form itself as came_from
    came_from = request.params.get('came_from', referrer)
    message = ''
    login = ''
    password = ''
    if 'form.submitted' in request.params:
        login = request.params['login']
        password = request.params['password']
        if USERS.get(login) == password:
            headers = remember(request, login)
            return HTTPFound(location = came_from,
                             headers = headers)
        message = 'Failed login'

    return dict(
        message = message,
        url = request.application_url + '/login',
        came_from = came_from,
        login = login,
        password = password,
        )

@view_config(route_name='logout')
def logout(request):
    headers = forget(request)
    return HTTPFound(location = request.route_url('view_wiki'),
                     headers = headers)
    

Only the highlighted lines need to be added or edited.

Our tutorial/tutorial/templates/edit.pt template will look like this when we're done:

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<!DOCTYPE html>
<html lang="${request.locale_name}">
  <head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta name="description" content="pyramid web application">
    <meta name="author" content="Pylons Project">
    <link rel="shortcut icon" href="${request.static_url('tutorial:static/pyramid-16x16.png')}">

    <title>${page.name} - Pyramid tutorial wiki (based on
    TurboGears 20-Minute Wiki)</title>

    <!-- Bootstrap core CSS -->
    <link href="//oss.maxcdn.com/libs/twitter-bootstrap/3.0.3/css/bootstrap.min.css" rel="stylesheet">

    <!-- Custom styles for this scaffold -->
    <link href="${request.static_url('tutorial:static/theme.css')}" rel="stylesheet">

    <!-- HTML5 shim and Respond.js IE8 support of HTML5 elements and media queries -->
    <!--[if lt IE 9]>
      <script src="//oss.maxcdn.com/libs/html5shiv/3.7.0/html5shiv.js"></script>
      <script src="//oss.maxcdn.com/libs/respond.js/1.3.0/respond.min.js"></script>
    <![endif]-->
  </head>
  <body>

    <div class="starter-template">
      <div class="container">
        <div class="row">
          <div class="col-md-2">
            <img class="logo img-responsive" src="${request.static_url('tutorial:static/pyramid.png')}" alt="pyramid web framework">
          </div>
          <div class="col-md-10">
            <div class="content">
              <p tal:condition="logged_in" class="pull-right">
                <a href="${request.application_url}/logout">Logout</a>
              </p>
              <p>
                Editing <strong><span tal:replace="page.name">Page Name Goes
                Here</span></strong>
              </p>
              <p>You can return to the
                <a href="${request.application_url}">FrontPage</a>.
              </p>
              <form action="${save_url}" method="post">
                <div class="form-group">
                  <textarea class="form-control" name="body" tal:content="page.data" rows="10" cols="60"></textarea>
                </div>
                <div class="form-group">
                  <button type="submit" name="form.submitted" value="Save" class="btn btn-default">Save</button>
                </div>
              </form>
            </div>
          </div>
        </div>
        <div class="row">
          <div class="copyright">
            Copyright &copy; Pylons Project
          </div>
        </div>
      </div>
    </div>


    <!-- Bootstrap core JavaScript
    ================================================== -->
    <!-- Placed at the end of the document so the pages load faster -->
    <script src="//oss.maxcdn.com/libs/jquery/1.10.2/jquery.min.js"></script>
    <script src="//oss.maxcdn.com/libs/twitter-bootstrap/3.0.3/js/bootstrap.min.js"></script>
  </body>
</html>

Only the highlighted lines need to be added or edited.

Our tutorial/tutorial/templates/view.pt template will look like this when we're done:

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<!DOCTYPE html>
<html lang="${request.locale_name}">
  <head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta name="description" content="pyramid web application">
    <meta name="author" content="Pylons Project">
    <link rel="shortcut icon" href="${request.static_url('tutorial:static/pyramid-16x16.png')}">

    <title>${page.name} - Pyramid tutorial wiki (based on
    TurboGears 20-Minute Wiki)</title>

    <!-- Bootstrap core CSS -->
    <link href="//oss.maxcdn.com/libs/twitter-bootstrap/3.0.3/css/bootstrap.min.css" rel="stylesheet">

    <!-- Custom styles for this scaffold -->
    <link href="${request.static_url('tutorial:static/theme.css')}" rel="stylesheet">

    <!-- HTML5 shim and Respond.js IE8 support of HTML5 elements and media queries -->
    <!--[if lt IE 9]>
      <script src="//oss.maxcdn.com/libs/html5shiv/3.7.0/html5shiv.js"></script>
      <script src="//oss.maxcdn.com/libs/respond.js/1.3.0/respond.min.js"></script>
    <![endif]-->
  </head>
  <body>

    <div class="starter-template">
      <div class="container">
        <div class="row">
          <div class="col-md-2">
            <img class="logo img-responsive" src="${request.static_url('tutorial:static/pyramid.png')}" alt="pyramid web framework">
          </div>
          <div class="col-md-10">
            <div class="content">
              <p tal:condition="logged_in" class="pull-right">
                <a href="${request.application_url}/logout">Logout</a>
              </p>
              <div tal:replace="structure content">
                Page text goes here.
              </div>
              <p>
                <a tal:attributes="href edit_url" href="">
                  Edit this page
                </a>
              </p>
              <p>
                  Viewing <strong><span tal:replace="page.name">
                  Page Name Goes Here</span></strong>
              </p>
              <p>You can return to the
                <a href="${request.application_url}">FrontPage</a>.
              </p>
            </div>
          </div>
        </div>
        <div class="row">
          <div class="copyright">
            Copyright &copy; Pylons Project
          </div>
        </div>
      </div>
    </div>


    <!-- Bootstrap core JavaScript
    ================================================== -->
    <!-- Placed at the end of the document so the pages load faster -->
    <script src="//oss.maxcdn.com/libs/jquery/1.10.2/jquery.min.js"></script>
    <script src="//oss.maxcdn.com/libs/twitter-bootstrap/3.0.3/js/bootstrap.min.js"></script>
  </body>
</html>

Only the highlighted lines need to be added or edited.

Viewing the application in a browser

We can finally examine our application in a browser (See Start the application). Launch a browser and visit each of the following URLs, checking that the result is as expected:

  • http://localhost:6543/ invokes the view_wiki view. This always redirects to the view_page view of the FrontPage page object. It is executable by any user.
  • http://localhost:6543/FrontPage invokes the view_page view of the FrontPage page object.
  • http://localhost:6543/FrontPage/edit_page invokes the edit view for the FrontPage object. It is executable by only the editor user. If a different user (or the anonymous user) invokes it, a login form will be displayed. Supplying the credentials with the username editor, password editor will display the edit page form.
  • http://localhost:6543/add_page/SomePageName invokes the add view for a page. It is executable by only the editor user. If a different user (or the anonymous user) invokes it, a login form will be displayed. Supplying the credentials with the username editor, password editor will display the edit page form.
  • After logging in (as a result of hitting an edit or add page and submitting the login form with the editor credentials), we'll see a Logout link in the upper right hand corner. When we click it, we're logged out, and redirected back to the front page.