From 89e762fd6e4a7593d909cae5da189e1b88f38d31 Mon Sep 17 00:00:00 2001
From: Simon Frei <freisim93@gmail.com>
Date: Sat, 3 Jul 2021 13:47:04 +0200
Subject: [PATCH] lib/model: Prevent folder-type change from/to encrypted
 (fixes #7704) (#7796)

---
 lib/model/model.go | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/lib/model/model.go b/lib/model/model.go
index 376a69ac0..4696dd77d 100644
--- a/lib/model/model.go
+++ b/lib/model/model.go
@@ -2767,6 +2767,13 @@ func (m *model) String() string {
 }
 
 func (m *model) VerifyConfiguration(from, to config.Configuration) error {
+	toFolders := to.FolderMap()
+	for _, from := range from.Folders {
+		to, ok := toFolders[from.ID]
+		if ok && from.Type != to.Type && (from.Type == config.FolderTypeReceiveEncrypted || to.Type == config.FolderTypeReceiveEncrypted) {
+			return errors.New("folder type must not be changed from/to receive-encrypted")
+		}
+	}
 	return nil
 }