1 files changed, 75 insertions, 0 deletions
diff --git a/apps/files_external/lib/Lib/Auth/PublicKey/RSA.php b/apps/files_external/lib/Lib/Auth/PublicKey/RSA.php
new file mode 100644
index 00000000000..ad95c743d2d
--- /dev/null
+++ b/apps/files_external/lib/Lib/Auth/PublicKey/RSA.php
@@ -0,0 +1,75 @@
+<?php
+
+/**
+ * SPDX-FileCopyrightText: 2017-2024 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-FileCopyrightText: 2016 ownCloud, Inc.
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+namespace OCA\Files_External\Lib\Auth\PublicKey;
+
+use OCA\Files_External\Lib\Auth\AuthMechanism;
+use OCA\Files_External\Lib\DefinitionParameter;
+use OCA\Files_External\Lib\StorageConfig;
+use OCP\IConfig;
+use OCP\IL10N;
+use OCP\IUser;
+use phpseclib\Crypt\RSA as RSACrypt;
+
+/**
+ * RSA public key authentication
+ */
+class RSA extends AuthMechanism {
+
+	public function __construct(
+		IL10N $l,
+		private IConfig $config,
+	) {
+		$this
+			->setIdentifier('publickey::rsa')
+			->setScheme(self::SCHEME_PUBLICKEY)
+			->setText($l->t('RSA public key'))
+			->addParameters([
+				new DefinitionParameter('user', $l->t('Login')),
+				new DefinitionParameter('public_key', $l->t('Public key')),
+				(new DefinitionParameter('private_key', 'private_key'))
+					->setType(DefinitionParameter::VALUE_PASSWORD)
+					->setFlag(DefinitionParameter::FLAG_HIDDEN),
+			])
+			->addCustomJs('public_key')
+		;
+	}
+
+	/**
+	 * @return void
+	 */
+	public function manipulateStorageConfig(StorageConfig &$storage, ?IUser $user = null) {
+		$auth = new RSACrypt();
+		$auth->setPassword($this->config->getSystemValue('secret', ''));
+		if (!$auth->loadKey($storage->getBackendOption('private_key'))) {
+			// Add fallback routine for a time where secret was not enforced to be exists
+			$auth->setPassword('');
+			if (!$auth->loadKey($storage->getBackendOption('private_key'))) {
+				throw new \RuntimeException('unable to load private key');
+			}
+		}
+		$storage->setBackendOption('public_key_auth', $auth);
+	}
+
+	/**
+	 * Generate a keypair
+	 *
+	 * @param int $keyLenth
+	 * @return array ['privatekey' => $privateKey, 'publickey' => $publicKey]
+	 */
+	public function createKey($keyLength) {
+		$rsa = new RSACrypt();
+		$rsa->setPublicKeyFormat(RSACrypt::PUBLIC_FORMAT_OPENSSH);
+		$rsa->setPassword($this->config->getSystemValue('secret', ''));
+
+		if ($keyLength !== 1024 && $keyLength !== 2048 && $keyLength !== 4096) {
+			$keyLength = 1024;
+		}
+
+		return $rsa->createKey($keyLength);
+	}
+}