Prevent proton mailboxes from enabling pgp encryption (#2086)

app/auth/views/change_email.py

@@ -3,11 +3,13 @@ from flask_login import login_user
 
 from app.auth.base import auth_bp
 from app.db import Session
+from app.extensions import limiter
 from app.log import LOG
 from app.models import EmailChange, ResetPasswordCode
 
 
 @auth_bp.route("/change_email", methods=["GET", "POST"])
+@limiter.limit("3/hour")
 def change_email():
     code = request.args.get("code")
 

app/dashboard/views/mailbox_detail.py

@@ -179,8 +179,15 @@ def mailbox_detail_route(mailbox_id):
 
         elif request.form.get("form-name") == "toggle-pgp":
             if request.form.get("pgp-enabled") == "on":
-                mailbox.disable_pgp = False
-                flash(f"PGP is enabled on {mailbox.email}", "success")
+                if mailbox.is_proton():
+                    mailbox.disable_pgp = True
+                    flash(
+                        "Enabling PGP for a Proton Mail mailbox is redundant and does not add any security benefit",
+                        "info",
+                    )
+                else:
+                    mailbox.disable_pgp = False
+                    flash(f"PGP is enabled on {mailbox.email}", "info")
             else:
                 mailbox.disable_pgp = True
                 flash(f"PGP is disabled on {mailbox.email}", "info")