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<?php
/**
* SPDX-FileCopyrightText: 2016-2024 Nextcloud GmbH and Nextcloud contributors
* SPDX-FileCopyrightText: 2016 ownCloud, Inc.
* SPDX-License-Identifier: AGPL-3.0-only
*/
namespace OC\Setup;
use OC\DatabaseException;
use OC\DB\Connection;
use OC\DB\QueryBuilder\Literal;
use OCP\Security\ISecureRandom;
class PostgreSQL extends AbstractDatabase {
public $dbprettyname = 'PostgreSQL';
/**
* @param string $username
* @throws \OC\DatabaseSetupException
*/
public function setupDatabase($username) {
try {
$connection = $this->connect([
'dbname' => 'postgres'
]);
if ($this->tryCreateDbUser) {
//check for roles creation rights in postgresql
$builder = $connection->getQueryBuilder();
$builder->automaticTablePrefix(false);
$query = $builder
->select('rolname')
->from('pg_roles')
->where($builder->expr()->eq('rolcreaterole', new Literal('TRUE')))
->andWhere($builder->expr()->eq('rolname', $builder->createNamedParameter($this->dbUser)));
try {
$result = $query->execute();
$canCreateRoles = $result->rowCount() > 0;
} catch (DatabaseException $e) {
$canCreateRoles = false;
}
if ($canCreateRoles) {
$connectionMainDatabase = $this->connect();
//use the admin login data for the new database user
//add prefix to the postgresql user name to prevent collisions
$this->dbUser = 'oc_' . strtolower($username);
//create a new password so we don't need to store the admin config in the config file
$this->dbPassword = \OC::$server->get(ISecureRandom::class)->generate(30, ISecureRandom::CHAR_ALPHANUMERIC);
$this->createDBUser($connection);
// Go to the main database and grant create on the public schema
// The code below is implemented to make installing possible with PostgreSQL version 15:
// https://www.postgresql.org/docs/release/15.0/
// From the release notes: For new databases having no need to defend against insider threats, granting CREATE permission will yield the behavior of prior releases
// Therefore we assume that the database is only used by one user/service which is Nextcloud
// Additional services should get installed in a separate database in order to stay secure
// Also see https://www.postgresql.org/docs/15/ddl-schemas.html#DDL-SCHEMAS-PATTERNS
$connectionMainDatabase->executeQuery('GRANT CREATE ON SCHEMA public TO "' . addslashes($this->dbUser) . '"');
$connectionMainDatabase->close();
}
}
$this->config->setValues([
'dbuser' => $this->dbUser,
'dbpassword' => $this->dbPassword,
]);
//create the database
$this->createDatabase($connection);
// the connection to dbname=postgres is not needed anymore
$connection->close();
} catch (\Exception $e) {
$this->logger->warning('Error trying to connect as "postgres", assuming database is setup and tables need to be created', [
'exception' => $e,
]);
$this->config->setValues([
'dbuser' => $this->dbUser,
'dbpassword' => $this->dbPassword,
]);
}
// connect to the database (dbname=$this->dbname) and check if it needs to be filled
$this->dbUser = $this->config->getValue('dbuser');
$this->dbPassword = $this->config->getValue('dbpassword');
$connection = $this->connect();
try {
$connection->connect();
} catch (\Exception $e) {
$this->logger->error($e->getMessage(), [
'exception' => $e,
]);
throw new \OC\DatabaseSetupException($this->trans->t('PostgreSQL Login and/or password not valid'),
$this->trans->t('You need to enter details of an existing account.'), 0, $e);
}
}
private function createDatabase(Connection $connection) {
if (!$this->databaseExists($connection)) {
//The database does not exists... let's create it
$query = $connection->prepare("CREATE DATABASE " . addslashes($this->dbName) . " OWNER \"" . addslashes($this->dbUser) . '"');
try {
$query->execute();
} catch (DatabaseException $e) {
$this->logger->error('Error while trying to create database', [
'exception' => $e,
]);
}
} else {
$query = $connection->prepare("REVOKE ALL PRIVILEGES ON DATABASE " . addslashes($this->dbName) . " FROM PUBLIC");
try {
$query->execute();
} catch (DatabaseException $e) {
$this->logger->error('Error while trying to restrict database permissions', [
'exception' => $e,
]);
}
}
}
private function userExists(Connection $connection) {
$builder = $connection->getQueryBuilder();
$builder->automaticTablePrefix(false);
$query = $builder->select('*')
->from('pg_roles')
->where($builder->expr()->eq('rolname', $builder->createNamedParameter($this->dbUser)));
$result = $query->execute();
return $result->rowCount() > 0;
}
private function databaseExists(Connection $connection) {
$builder = $connection->getQueryBuilder();
$builder->automaticTablePrefix(false);
$query = $builder->select('datname')
->from('pg_database')
->where($builder->expr()->eq('datname', $builder->createNamedParameter($this->dbName)));
$result = $query->execute();
return $result->rowCount() > 0;
}
private function createDBUser(Connection $connection) {
$dbUser = $this->dbUser;
try {
$i = 1;
while ($this->userExists($connection)) {
$i++;
$this->dbUser = $dbUser . $i;
}
// create the user
$query = $connection->prepare("CREATE USER \"" . addslashes($this->dbUser) . "\" CREATEDB PASSWORD '" . addslashes($this->dbPassword) . "'");
$query->execute();
if ($this->databaseExists($connection)) {
$query = $connection->prepare('GRANT CONNECT ON DATABASE ' . addslashes($this->dbName) . ' TO "' . addslashes($this->dbUser) . '"');
$query->execute();
}
} catch (DatabaseException $e) {
$this->logger->error('Error while trying to create database user', [
'exception' => $e,
]);
}
}
}
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