Revert Referrer-Policy header commit. (#842)

Although OWASP still recommends that reset password and confirmation links have the no-referrer header option set - this causes issues with HTTPS and Flask-WTF that requires a referrer header.
Also - for the past 5 years, the browser default for Referrer-Policy is 'strict-origin-when-cross-origin' which should be enough to mitigate any possible Referrer leakage.

closes #829

CHANGES.rst

@@ -3,6 +3,22 @@ Flask-Security Changelog
 
 Here you can see the full list of changes between each Flask-Security release.
 
+Version 5.3.1
+-------------
+
+Released October XX, 2023
+
+Please Note: py_webauthn is pinned to 1.9.0 until the issue with user_handle
+is resolved.
+
+Fixes
+++++++
+
+- (:issue:`829`) Revert change in 5.3.0 that added a Referrer-Policy header.
+- (:issue:`826`) Fix error in quickstart (codycollier)
+- (:pr:`835`) Update Armenian translations (amkrtchyan-tmp)
+- (:pr:`831`) Update German translations. (sr-verde)
+
 Version 5.3.0
 -------------
 
@@ -51,7 +67,7 @@ Backwards Compatibility Concerns
     - The SECURITY_MSG_PASSWORD_RESET_EXPIRED message no longer contains the user's identity/email.
     - The default for :py:data:`SECURITY_RESET_PASSWORD_WITHIN` has been changed from `5 days` to `1 days`.
     - The response to GET /reset/<token> sets the HTTP header `Referrer-Policy` to `no-referrer` as suggested
-      by OWASP.
+      by OWASP. *PLEASE NOTE: this was backed out in 5.3.1*
 - Confirm email was changed to adhere to OWASP recommendations and reduce possible exploitation:
 
     - A new email (with new token) is no longer sent upon expired token. Users must restart
@@ -63,7 +79,7 @@ Backwards Compatibility Concerns
       align better with OWASP best practices. Setting it to ``True`` will restore prior behavior.
     - The SECURITY_MSG_CONFIRMATION_EXPIRED message no longer contains the user's identity/email.
     - The response to GET /reset/<token> sets the HTTP header `Referrer-Policy` to `no-referrer` as suggested
-      by OWASP.
+      by OWASP. *PLEASE NOTE: this was backed out in 5.3.1*
 
 Version 5.2.0
 -------------
@@ -200,7 +216,7 @@ Fixes
 Version 5.0.0
 -------------
 
-Released August 27. 2022
+Released August 27, 2022
 
 **PLEASE READ CHANGE NOTES CAREFULLY - THERE ARE LIKELY REQUIRED CHANGES YOU WILL HAVE TO MAKE.**
 

flask_security/views.py

@@ -462,23 +462,17 @@ def confirm_email(token):
 
         if _security.redirect_behavior == "spa":
             # No reason to expose identity info to anyone who has the link
-            return (
-                redirect(
-                    get_url(
-                        _security.confirm_error_view,
-                        qparams={c: m},
-                    )
-                ),
-                {"Referrer-Policy": "no-referrer"},
+            return redirect(
+                get_url(
+                    _security.confirm_error_view,
+                    qparams={c: m},
+                )
             )
 
         do_flash(m, c)
-        return (
-            redirect(
-                get_url(_security.confirm_error_view)
-                or url_for_security("send_confirmation")
-            ),
-            {"Referrer-Policy": "no-referrer"},
+        return redirect(
+            get_url(_security.confirm_error_view)
+            or url_for_security("send_confirmation")
         )
 
     confirm_user(user)
@@ -500,30 +494,22 @@ def confirm_email(token):
             )
             if response:
                 do_flash(m, c)
-                return response, {"Referrer-Policy": "no-referrer"}
+                return response
             login_user(user, authn_via=["confirm"])
 
     if _security.redirect_behavior == "spa":
-        return (
-            redirect(
-                get_url(
-                    _security.post_confirm_view,
-                    qparams=user.get_redirect_qparams({c: m}),
-                )
-            ),
-            {"Referrer-Policy": "no-referrer"},
+        return redirect(
+            get_url(
+                _security.post_confirm_view,
+                qparams=user.get_redirect_qparams({c: m}),
+            )
         )
     do_flash(m, c)
-    return (
-        redirect(
-            get_url(_security.post_confirm_view)
-            or get_url(
-                _security.post_login_view
-                if cv("AUTO_LOGIN_AFTER_CONFIRM")
-                else ".login"
-            )
-        ),
-        {"Referrer-Policy": "no-referrer"},
+    return redirect(
+        get_url(_security.post_confirm_view)
+        or get_url(
+            _security.post_login_view if cv("AUTO_LOGIN_AFTER_CONFIRM") else ".login"
+        )
     )
 
 
@@ -616,26 +602,19 @@ def reset_password(token):
         # Still - don't include PII such as identity and email if someone
         # intercepts link they still won't necessarily know the login identity
         # (even though they can change the password!).
-        # OWASP recommends setting no-referrer for requests with tokens.
         if _security.redirect_behavior == "spa":
-            return (
-                redirect(
-                    get_url(
-                        _security.reset_view,
-                        qparams={"token": token},
-                    )
-                ),
-                {"Referrer-Policy": "no-referrer"},
+            return redirect(
+                get_url(
+                    _security.reset_view,
+                    qparams={"token": token},
+                )
             )
         # for forms - render the reset password form
-        return (
-            _security.render_template(
-                cv("RESET_PASSWORD_TEMPLATE"),
-                reset_password_form=form,
-                reset_password_token=token,
-                **_ctx("reset_password"),
-            ),
-            {"Referrer-Policy": "no-referrer"},
+        return _security.render_template(
+            cv("RESET_PASSWORD_TEMPLATE"),
+            reset_password_form=form,
+            reset_password_token=token,
+            **_ctx("reset_password"),
         )
 
     # This is the POST case.

tests/test_confirmable.py

@@ -89,7 +89,6 @@ def on_instructions_sent(app, **kwargs):
     token = registrations[0]["confirm_token"]
     response = clients.get("/confirm/" + token, follow_redirects=False)
     assert len(recorded_confirms) == 1
-    assert response.headers.get("Referrer-Policy", None) == "no-referrer"
     response = clients.get(response.location)
     assert get_message("EMAIL_CONFIRMED") in response.data
     # make sure not logged in
@@ -361,7 +360,6 @@ def test_confirm_redirect_to_post_confirm(client, get_message):
 
     response = client.get("/confirm/" + token, follow_redirects=False)
     assert "/post_confirm" in response.location
-    assert response.headers.get("Referrer-Policy", None) == "no-referrer"
 
 
 @pytest.mark.registerable()
@@ -393,7 +391,6 @@ def test_spa_get(app, client, get_message):
         assert "/confirm-redirect" == split.path
         qparams = dict(parse_qsl(split.query))
         assert qparams["email"] == "dude@lp.com"
-        assert response.headers.get("Referrer-Policy", None) == "no-referrer"
 
         response = client.get("/confirm/" + token)
         split = urlsplit(response.headers["Location"])
@@ -402,7 +399,6 @@ def test_spa_get(app, client, get_message):
         assert "/confirm-error" in response.location
         assert "email" not in qparams
         assert get_message("ALREADY_CONFIRMED") in qparams["info"].encode("utf-8")
-        assert response.headers.get("Referrer-Policy", None) == "no-referrer"
 
     # Arguably for json we shouldn't have any - this is buried in register_user
     # but really shouldn't be.

tests/test_recoverable.py

@@ -63,8 +63,6 @@ def on_instructions_sent(app, **kwargs):
     # Test view for reset token
     response = clients.get("/reset/" + token)
     assert b"<h1>Reset password</h1>" in response.data
-    # OWASP recommends setting this
-    assert response.headers.get("Referrer-Policy", None) == "no-referrer"
 
     # Test submitting a new password but leave out confirm
     response = clients.post(
@@ -460,8 +458,6 @@ def test_spa_get(app, client):
 
     response = client.get("/reset/" + token)
     assert response.status_code == 302
-    # OWASP recommends setting this
-    assert response.headers.get("Referrer-Policy", None) == "no-referrer"
     split = urlsplit(response.headers["Location"])
     assert "localhost:8081" == split.netloc
     assert "/reset-redirect" == split.path