refactor(setup): Centralize database password generation in AbstractDatabase

lib/private/Setup/AbstractDatabase.php

@@ -75,6 +75,27 @@ public function initialize(array $config): void {
 		$this->tablePrefix = $dbTablePrefix;
 	}
 
+	/**
+	 * Generate a strong random password suitable for database user accounts.
+	 *
+	 * Guarantees at least 2 uppercase, 2 lowercase, 2 digit, and 2 symbol
+	 * characters are present, with symbols filtered to exclude characters
+	 * that are problematic in SQL string contexts (", \, ', `).
+	 *
+	 * @return string A 30-character random password
+	 */
+	protected function generateDbPassword(): string {
+		$safeSymbols = str_replace(['\"', '\\', '\'', '`'], '', ISecureRandom::CHAR_SYMBOLS);
+
+		$password = $this->random->generate(22, ISecureRandom::CHAR_ALPHANUMERIC . $safeSymbols)
+			. $this->random->generate(2, ISecureRandom::CHAR_UPPER)
+			. $this->random->generate(2, ISecureRandom::CHAR_LOWER)
+			. $this->random->generate(2, ISecureRandom::CHAR_DIGITS)
+			. $this->random->generate(2, $safeSymbols);
+
+		return str_shuffle($password);
+	}
+
 	/**
 	 * @param array $configOverwrite
 	 * @return \OC\DB\Connection

lib/private/Setup/MySQL.php

@@ -13,7 +13,6 @@
 use OC\DB\ConnectionAdapter;
 use OC\DB\MySqlTools;
 use OCP\IDBConnection;
-use OCP\Security\ISecureRandom;
 
 class MySQL extends AbstractDatabase {
 	public string $dbprettyname = 'MySQL/MariaDB';
@@ -127,14 +126,8 @@ private function createSpecificUser(string $username, IDBConnection $connection)
 		$rootUser = $this->dbUser;
 		$rootPassword = $this->dbPassword;
 
-		//create a random password so we don't need to store the admin password in the config file
-		$saveSymbols = str_replace(['\"', '\\', '\'', '`'], '', ISecureRandom::CHAR_SYMBOLS);
-		$password = $this->random->generate(22, ISecureRandom::CHAR_ALPHANUMERIC . $saveSymbols)
-			. $this->random->generate(2, ISecureRandom::CHAR_UPPER)
-			. $this->random->generate(2, ISecureRandom::CHAR_LOWER)
-			. $this->random->generate(2, ISecureRandom::CHAR_DIGITS)
-			. $this->random->generate(2, $saveSymbols);
-		$this->dbPassword = str_shuffle($password);
+		// Create a random password so we don't need to store the admin password in the config file
+		$this->dbPassword = $this->generateDbPassword();
 
 		try {
 			//user already specified in config

lib/private/Setup/PostgreSQL.php

@@ -11,8 +11,6 @@
 use OC\DatabaseSetupException;
 use OC\DB\Connection;
 use OC\DB\QueryBuilder\Literal;
-use OCP\Security\ISecureRandom;
-use OCP\Server;
 
 class PostgreSQL extends AbstractDatabase {
 	public $dbprettyname = 'PostgreSQL';
@@ -48,8 +46,9 @@ public function setupDatabase(): void {
 
 					//add prefix to the postgresql user name to prevent collisions
 					$this->dbUser = 'oc_admin';
-					//create a new password so we don't need to store the admin config in the config file
-					$this->dbPassword = Server::get(ISecureRandom::class)->generate(30, ISecureRandom::CHAR_ALPHANUMERIC);
+
+					// Create a new password so we don't need to store the admin config in the config file
+					$this->dbPassword = $this->generateDbPassword();
 
 					$this->createDBUser($connection);
 				}