Metadata-Version: 1.1
Name: flask-talisman
Version: 1.0.0
Summary: HTTP security headers for Flask.
Home-page: https://github.com/wntrblm/flask-talisman
Author: Alethea Katherine Flowers
Author-email: me@thea.codes
License: Apache Software License
Description: Talisman: HTTP security headers for Flask
        =========================================
        
        |PyPI Version|
        
        Talisman is a small Flask extension that handles setting HTTP headers
        that can help protect against a few common web application security
        issues.
        
        The default configuration:
        
        -  Forces all connects to ``https``, unless running with debug enabled.
        -  Enables `HTTP Strict Transport
           Security <https://developer.mozilla.org/en-US/docs/Web/Security/HTTP_strict_transport_security>`_.
        -  Sets Flask's session cookie to ``secure``, so it will never be set if
           your application is somehow accessed via a non-secure connection.
        -  Sets Flask's session cookie to ``httponly``, preventing JavaScript
           from being able to access its content. CSRF via Ajax uses a separate
           cookie and should be unaffected.
        -  Sets Flask's session cookie to ``Lax``, preventing the cookie to be leaked
           in CSRF-prone request methods.
        -  Sets
           `X-Frame-Options <https://developer.mozilla.org/en-US/docs/Web/HTTP/X-Frame-Options>`_
           to ``SAMEORIGIN`` to avoid
           `clickjacking <https://en.wikipedia.org/wiki/Clickjacking>`_.
        -  Sets `X-XSS-Protection
           <https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-XSS-Protection>`_
           to enable a cross site scripting filter for IE and Safari (note Chrome has
           removed this and Firefox never supported it).
        -  Sets `X-Content-Type-Options
           <https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Content-Type-Options>`_
           to prevent content type sniffing.
        -  Sets a strict `Content Security
           Policy <https://developer.mozilla.org/en-US/docs/Web/Security/CSP/Introducing_Content_Security_Policy>`__
           of ``default-src: 'self', 'object-src': 'none'``. This is intended to almost completely
           prevent Cross Site Scripting (XSS) attacks. This is probably the only
           setting that you should reasonably change. See the
           `Content Security Policy`_ section.
        -  Sets a strict `Referrer-Policy <https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Referrer-Policy>`_
           of ``strict-origin-when-cross-origin`` that governs which referrer information should be included with
           requests made.
        
        
        In addition to Talisman, you **should always use a cross-site request
        forgery (CSRF) library**. It's highly recommended to use
        `Flask-SeaSurf <https://flask-seasurf.readthedocs.org/en/latest/>`_,
        which is based on Django's excellent library.
        
        Installation & Basic Usage
        --------------------------
        
        Install via `pip <https://pypi.python.org/pypi/pip>`_:
        
        ::
        
            pip install flask-talisman
        
        After installing, wrap your Flask app with a ``Talisman``:
        
        .. code:: python
        
            from flask import Flask
            from flask_talisman import Talisman
        
            app = Flask(__name__)
            Talisman(app)
        
        
        There is also a full `Example App <https://github.com/wntrblm/flask-talisman/blob/master/example_app>`_.
        
        Options
        -------
        
        -  ``force_https``, default ``True``, forces all non-debug connects to
           ``https`` (`about HTTPS <https://developer.mozilla.org/en-US/docs/Glossary/https>`_).
        -  ``force_https_permanent``, default ``False``, uses ``301`` instead of
           ``302`` for ``https`` redirects.
        
        -  ``frame_options``, default ``SAMEORIGIN``, can be ``SAMEORIGIN``,
           ``DENY``, or ``ALLOWFROM`` (`about Frame Options <https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Frame-Options>`_).
        -  ``frame_options_allow_from``, default ``None``, a string indicating
           the domains that are allowed to embed the site via iframe.
        
        -  ``strict_transport_security``, default ``True``, whether to send HSTS
           headers (`about HSTS <https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Strict-Transport-Security>`_).
        -  ``strict_transport_security_preload``, default ``False``, enables HSTS
           preloading. If you register your application with
           `Google's HSTS preload list <https://hstspreload.appspot.com/>`_,
           Firefox and Chrome will never load your site over a non-secure
           connection.
        -  ``strict_transport_security_max_age``, default ``ONE_YEAR_IN_SECS``,
           length of time the browser will respect the HSTS header.
        -  ``strict_transport_security_include_subdomains``, default ``True``,
           whether subdomains should also use HSTS.
        
        -  ``content_security_policy``, default ``default-src: 'self'`, 'object-src': 'none'``, see the
           `Content Security Policy`_ section (`about Content Security Policy <https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy>`_).
        -  ``content_security_policy_nonce_in``, default ``[]``. Adds a per-request nonce
           value to the flask request object and also to the specified CSP header section.
           I.e. ``['script-src', 'style-src']``
        -  ``content_security_policy_report_only``, default ``False``, whether to set
           the CSP header as "report-only" (as `Content-Security-Policy-Report-Only`)
           to ease deployment by disabling the policy enforcement by the browser,
           requires passing a value with the ``content_security_policy_report_uri``
           parameter
        -  ``content_security_policy_report_uri``, default ``None``, a string
           indicating the report URI used for `CSP violation reports
           <https://developer.mozilla.org/en-US/docs/Web/Security/CSP/Using_CSP_violation_reports>`_
        
        -  ``referrer_policy``, default ``strict-origin-when-cross-origin``, a string
           that sets the Referrer Policy header to send a full URL when performing a same-origin
           request, only send the origin of the document to an equally secure destination
           (HTTPS->HTTPS), and send no header to a less secure destination (HTTPS->HTTP) (`about Referrer Policy <https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Referrer-Policy>`_).
        
        -  ``feature_policy``, default ``{}``, see the `Feature Policy`_ section (`about Feature Policy <https://developer.mozilla.org/en-US/docs/Web/HTTP/Feature_Policy>`_).
        
        -  ``permissions_policy``, default ``{}``, see the `Permissions Policy`_ section (`about Permissions Policy <https://developer.mozilla.org/en-US/docs/Web/HTTP/Feature_Policy>`_).
        -  ``document_policy``, default ``{}``, see the `Document Policy`_ section (`about Document Policy <https://wicg.github.io/document-policy/>`_).
        
        -  ``session_cookie_secure``, default ``True``, set the session cookie
           to ``secure``, preventing it from being sent over plain ``http`` (`about cookies (https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Set-Cookie)_`).
        -  ``session_cookie_http_only``, default ``True``, set the session
           cookie to ``httponly``, preventing it from being read by JavaScript.
        -  ``session_cookie_samesite``, default ``Lax``, set this to ``Strict`` to prevent the cookie from being sent by the browser to the target site in all cross-site browsing context, even when following a regular link.
        
        
        -  ``force_file_save``, default ``False``, whether to set the
           `X-Download-Options <https://docs.microsoft.com/en-us/previous-versions/windows/internet-explorer/ie-developer/compatibility/jj542450(v=vs.85)?redirectedfrom=MSDN>`_
           header to ``noopen`` to prevent IE >= 8 to from opening file downloads
           directly and only save them instead.
        
        -  ``x_content_type_options``, default ``True``, Protects against MIME sniffing vulnerabilities (`about Content Type Options <https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Content-Type-Options>`_).
        -  ``x_xss_protection``, default ``True``, Protects against cross-site scripting (XSS) attacks (`about XSS Protection <https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-XSS-Protection>`_).
        
        For a full list of (security) headers, check out: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers.
        
        Per-view options
        ~~~~~~~~~~~~~~~~
        
        Sometimes you want to change the policy for a specific view. The
        ``force_https``, ``frame_options``, ``frame_options_allow_from``,
        `content_security_policy``, ``feature_policy``, ``permissions_policy``
        and ``document_policy`` options can be changed on a per-view basis.
        
        .. code:: python
        
            from flask import Flask
            from flask_talisman import Talisman, ALLOW_FROM
        
            app = Flask(__name__)
            talisman = Talisman(app)
        
            @app.route('/normal')
            def normal():
                return 'Normal'
        
            @app.route('/embeddable')
            @talisman(frame_options=ALLOW_FROM, frame_options_allow_from='*')
            def embeddable():
                return 'Embeddable'
        
        Content Security Policy
        -----------------------
        
        The default content security policy is extremely strict and will
        prevent loading any resources that are not in the same domain as the
        application. Most web applications will need to change this policy.
        If you're not ready to deploy Content Security Policy, you can set
        `content_security_policy` to `False` to disable sending this header
        entirely.
        
        A slightly more permissive policy is available at
        ``flask_talisman.GOOGLE_CSP_POLICY``, which allows loading Google-hosted JS
        libraries, fonts, and embeding media from YouTube and Maps.
        
        You can and should create your own policy to suit your site's needs.
        Here's a few examples adapted from
        `MDN <https://developer.mozilla.org/en-US/docs/Web/Security/CSP/Using_Content_Security_Policy>`_:
        
        Example 1
        ~~~~~~~~~
        
        This is the default policy. A web site administrator wants all content
        to come from the site's own origin (this excludes subdomains) and disallow
        legacy HTML elements.
        
        .. code:: python
        
            csp = {
                'default-src': '\'self\'',
                'object-src': '\'none\'',
            }
            talisman = Talisman(app, content_security_policy=csp)
        
        Example 2
        ~~~~~~~~~
        
        A web site administrator wants to allow content from a trusted domain
        and all its subdomains (it doesn't have to be the same domain that the
        CSP is set on.)
        
        .. code:: python
        
            csp = {
                'default-src': [
                    '\'self\'',
                    '*.trusted.com'
                ]
            }
        
        Example 3
        ~~~~~~~~~
        
        A web site administrator wants to allow users of a web application to
        include images from any origin in their own content, but to restrict
        audio or video media to trusted providers, and all scripts only to a
        specific server that hosts trusted code.
        
        .. code:: python
        
            csp = {
                'default-src': '\'self\'',
                'img-src': '*',
                'media-src': [
                    'media1.com',
                    'media2.com',
                ],
                'script-src': 'userscripts.example.com'
            }
        
        In this example content is only permitted from the document's origin
        with the following exceptions:
        
        -  Images may loaded from anywhere (note the ``*`` wildcard).
        -  Media is only allowed from media1.com and media2.com (and not from
           subdomains of those sites).
        -  Executable script is only allowed from userscripts.example.com.
        
        Example 4
        ~~~~~~~~~
        
        A web site administrator for an online banking site wants to ensure that
        all its content is loaded using SSL, in order to prevent attackers from
        eavesdropping on requests.
        
        .. code:: python
        
            csp = {
                'default-src': 'https://onlinebanking.jumbobank.com'
            }
        
        The server only permits access to documents being loaded specifically
        over HTTPS through the single origin onlinebanking.jumbobank.com.
        
        Example 5
        ~~~~~~~~~
        
        A web site administrator of a web mail site wants to allow HTML in
        email, as well as images loaded from anywhere, but not JavaScript or
        other potentially dangerous content.
        
        .. code:: python
        
            csp = {
                'default-src': [
                    '\'self\'',
                    '*.mailsite.com',
                ],
                'img-src': '*'
            }
        
        Note that this example doesn't specify a ``script-src``; with the
        example CSP, this site uses the setting specified by the ``default-src``
        directive, which means that scripts can be loaded only from the
        originating server.
        
        Example 6
        ~~~~~~~~~
        
        A web site administrator wants to allow embedded scripts (which might
        be generated dynamicially).
        
        .. code:: python
        
            csp = {
                'default-src': '\'self\'',
                'script-src': '\'self\'',
            }
            talisman = Talisman(
                app,
                content_security_policy=csp,
                content_security_policy_nonce_in=['script-src']
            )
        
        The nonce needs to be added to the script tag in the template:
        
        .. code:: html
        
            <script nonce="{{ csp_nonce() }}">
                //...
            </script>
        
        Note that the CSP directive (`script-src` in the example) to which the `nonce-...`
        source should be added needs to be defined explicitly.
        
        Example 7
        ~~~~~~~~~
        
        A web site adminstrator wants to override the CSP directives via an
        environment variable which doesn't support specifying the policy as
        a Python dictionary, e.g.:
        
        .. code:: bash
        
            export CSP_DIRECTIVES="default-src 'self'; image-src *"
            python app.py
        
        Then in the app code you can read the CSP directives from the environment:
        
        .. code:: python
        
            import os
            from flask_talisman import Talisman, DEFAULT_CSP_POLICY
        
            talisman = Talisman(
                app,
                content_security_policy=os.environ.get("CSP_DIRECTIVES", DEFAULT_CSP_POLICY),
            )
        
        As you can see above the policy can be defined simply just like the official
        specification requires the HTTP header to be set: As a semicolon separated
        list of individual CSP directives.
        
        Feature Policy
        --------------
        
        **Note:** Feature Policy has largely been `renamed Permissions Policy <https://github.com/w3c/webappsec-feature-policy/issues/359>`_
        in the latest draft and some features are likely to move to Document Policy.
        At this writing, most browsers support the ``Feature-Policy`` HTTP Header name.
        See the `Permissions Policy`_ and `Document Policy`_ sections below should you wish
        to set these.
        
        Also note that the Feature Policy specification did not progress beyond the `draft https://wicg.github.io/feature-policy/`
        stage before being renamed, but is `supported in some form in most browsers
        <https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Feature-Policy#Browser_compatibility>`_.
        
        The default feature policy is empty, as this is the default expected behaviour.
        
        Geolocation Example
        ~~~~~~~~~~~~~~~~~~~
        
        Disable access to Geolocation interface.
        
        .. code:: python
        
            feature_policy = {
                'geolocation': '\'none\''
            }
            talisman = Talisman(app, feature_policy=feature_policy)
        
        Permissions Policy
        ------------------
        
        Feature Policy has been split into Permissions Policy and Document Policy but
        at this writing `browser support of Permissions Policy is very limited <https://caniuse.com/permissions-policy>`_,
        and it is recommended to still set the ``Feature-Policy`` HTTP Header.
        Permission Policy support is included in Talisman for when this becomes more
        widely supported.
        
        Note that the `Permission Policy is still an Working Draft <https://www.w3.org/TR/permissions-policy/>`_.
        
        When the same feature or permission is set in both Feature Policy and Permission Policy,
        the Permission Policy setting will take precedence in browsers that support both.
        
        It should be noted that the syntax differs between Feature Policy and Permission Policy
        as can be seen from the ``geolocation`` examples provided.
        
        Permission Policy can be set either using a dictionary, or using a string.
        
        Geolocation and Microphone Example
        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
        
        Disable access to Geolocation interface and Microphone using dictionary syntax
        
        .. code:: python
        
            permission_policy = {
                'geolocation': '()',
                'microphone': '()'
            }
            talisman = Talisman(app, permission_policy=permission_policy)
        
        Disable access to Geolocation interface and Microphone using string syntax
        
        .. code:: python
        
            permission_policy = 'geolocation=(), microphone=()'
            talisman = Talisman(app, permission_policy=permission_policy)
        
        Document Policy
        ---------------
        
        Feature Policy has been split into Permissions Policy and Document Policy but
        at this writing `browser support of Document Policy is very limited <https://caniuse.com/document-policy>`_,
        and it is recommended to still set the ``Feature-Policy`` HTTP Header.
        Document Policy support is included in Talisman for when this becomes more
        widely supported.
        
        Note that the `Document Policy is still an Unofficial Draft <https://wicg.github.io/document-policy/>`_.
        
        The default Document Policy is empty, as this is the default expected behaviour.
        
        Document Policy can be set either using a dictionary, or using a string.
        
        Oversized-Images Example
        ~~~~~~~~~~~~~~~~~~~~~~~~
        
        Forbid oversized-images using dictionary syntax:
        
        .. code:: python
        
            document_policy = {
                'oversized-images': '?0'
            }
            talisman = Talisman(app, document_policy=document_policy)
        
        Forbid oversized-images using string syntax:
        
        .. code:: python
        
            document_policy = 'oversized-images=?0'
            talisman = Talisman(app, document_policy=document_policy)
        
        Disclaimer
        ----------
        
        This code originated at Google, but is not an official Google product,
        experimental or otherwise. It was forked on June 6th, 2021 from the
        unmaintained GoogleCloudPlatform/flask-talisman.
        
        There is no silver bullet for web application security. Talisman can
        help, but security is more than just setting a few headers. Any
        public-facing web application should have a comprehensive approach to
        security.
        
        
        Contributing changes
        --------------------
        
        -  See `CONTRIBUTING.md`_
        
        Licensing
        ---------
        
        - Apache 2.0 - See `LICENSE`_
        
        .. _LICENSE: https://github.com/wntrblm/flask-talisman/blob/master/LICENSE
        .. _CONTRIBUTING.md: https://github.com/wntrblm/flask-talisman/blob/master/CONTRIBUTING.md
        .. |PyPI Version| image:: https://img.shields.io/pypi/v/flask-talisman.svg
           :target: https://pypi.python.org/pypi/flask-talisman
        
Keywords: flask security https xss
Platform: UNKNOWN
Classifier: Development Status :: 5 - Production/Stable
Classifier: Intended Audience :: Developers
Classifier: Topic :: Software Development :: Libraries :: Python Modules
Classifier: License :: OSI Approved :: Apache Software License
Classifier: Programming Language :: Python
Classifier: Programming Language :: Python :: 3
Classifier: Programming Language :: Python :: 3.5
Classifier: Programming Language :: Python :: 3.6
Classifier: Programming Language :: Python :: 3.7
Classifier: Programming Language :: Python :: 3.8
Classifier: Programming Language :: Python :: 3.9
Classifier: Operating System :: POSIX
Classifier: Operating System :: MacOS
Classifier: Operating System :: Unix
License-File: LICENSE
