Make legacy cipher opt in

* Systems that upgrade have this enabled by default
* New systems disable it
* We'll have to add some wargning in the setup checks if this is enabled

Signed-off-by: Roeland Jago Douma <roeland@famdouma.nl>

1 files changed, 62 insertions, 0 deletions

diff --git a/lib/private/Repair/NC20/EncryptionLegacyCipher.php b/lib/private/Repair/NC20/EncryptionLegacyCipher.php
new file mode 100644
index 00000000000..4e743f3f1db
--- /dev/null
+++ b/lib/private/Repair/NC20/EncryptionLegacyCipher.php
@@ -0,0 +1,62 @@
+<?php
+
+declare(strict_types=1);
+/**
+ * @copyright Copyright (c) 2020, Roeland Jago Douma <roeland@famdouma.nl>
+ *
+ * @author Roeland Jago Douma <roeland@famdouma.nl>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace OC\Repair\NC20;
+
+use OCP\Encryption\IManager;
+use OCP\IConfig;
+use OCP\Migration\IOutput;
+use OCP\Migration\IRepairStep;
+
+class EncryptionLegacyCipher implements IRepairStep {
+
+	/** @var IConfig */
+	private $config;
+	/** @var IManager */
+	private $manager;
+
+	public function __construct(IConfig $config,
+								IManager $manager) {
+		$this->config = $config;
+		$this->manager = $manager;
+	}
+
+	public function getName(): string {
+		return 'Keep legacy encryption enabled';
+	}
+
+	private function shouldRun(): bool {
+		$versionFromBeforeUpdate = $this->config->getSystemValue('version', '0.0.0.0');
+		return version_compare($versionFromBeforeUpdate, '20.0.0.0', '<=');
+	}
+
+	public function run(IOutput $output): void {
+		if ($this->manager->isEnabled()) {
+			if ($this->config->getSystemValue('encryption.legacy_format_support', '') === '') {
+				$this->config->setSystemValue('encryption.legacy_format_support', true);
+			}
+		}
+	}
+}