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DbTool.php
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DbTool.php
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<?php
// {{{ICINGA_LICENSE_HEADER}}}
// {{{ICINGA_LICENSE_HEADER}}}
namespace Icinga\Web\Setup;
use PDO;
use PDOException;
use LogicException;
use Zend_Db_Adapter_Pdo_Mysql;
use Zend_Db_Adapter_Pdo_Pgsql;
use Icinga\Util\File;
use Icinga\Application\Platform;
use Icinga\Exception\ConfigurationError;
/**
* Utility class to ease working with databases when installing Icinga Web 2 or one of its modules
*/
class DbTool
{
/**
* The PDO database connection
*
* @var PDO
*/
protected $pdoConn;
/**
* The Zend database adapter
*
* @var Zend_Db_Adapter_Pdo_Abstract
*/
protected $zendConn;
/**
* The resource configuration
*
* @var array
*/
protected $config;
/**
* Create a new DbTool
*
* @param array $config The resource configuration to use
*/
public function __construct(array $config)
{
$this->config = $config;
}
/**
* Connect to the server
*
* @return self
*/
public function connectToHost()
{
$this->assertHostAccess();
if ($this->config['db'] == 'pgsql') {
// PostgreSQL requires us to specify a database on each connection and will use
// the current user name as default database in cases none is provided. If
// that database doesn't exist (which might be the case here) it will error.
// Therefore, we specify the maintenance database 'postgres' as database, which
// is most probably present and public.
$this->connect('postgres');
} else {
$this->connect();
}
return $this;
}
/**
* Connect to the database
*
* @return self
*/
public function connectToDb()
{
$this->assertHostAccess();
$this->assertDatabaseAccess();
$this->connect($this->config['dbname']);
return $this;
}
/**
* Assert that all configuration values exist that are required to connect to a server
*
* @throws ConfigurationError
*/
protected function assertHostAccess()
{
if (false === isset($this->config['db'])) {
throw new ConfigurationError('Can\'t connect to database server of unknown type');
} elseif (false === isset($this->config['host'])) {
throw new ConfigurationError('Can\'t connect to database server without a hostname or address');
} elseif (false === isset($this->config['port'])) {
throw new ConfigurationError('Can\'t connect to database server without a port');
} elseif (false === isset($this->config['username'])) {
throw new ConfigurationError('Can\'t connect to database server without a username');
} elseif (false === isset($this->config['password'])) {
throw new ConfigurationError('Can\'t connect to database server without a password');
}
}
/**
* Assert that all configuration values exist that are required to connect to a database
*
* @throws ConfigurationError
*/
protected function assertDatabaseAccess()
{
if (false === isset($this->config['dbname'])) {
throw new ConfigurationError('Can\'t connect to database without a valid database name');
}
}
/**
* Assert that a connection with a database has been established
*
* @throws LogicException
*/
protected function assertConnectedToDb()
{
if ($this->zendConn === null) {
throw new LogicException('Not connected to database');
}
}
/**
* Establish a connection with the database or just the server by omitting the database name
*
* @param string $dbname The name of the database to connect to
*/
public function connect($dbname = null)
{
$this->_pdoConnect($dbname);
if ($dbname !== null) {
$this->_zendConnect($dbname);
}
}
/**
* Reestablish a connection with the database or just the server by omitting the database name
*
* @param string $dbname The name of the database to connect to
*/
public function reconnect($dbname = null)
{
$this->pdoConn = null;
$this->zendConn = null;
$this->connect($dbname);
}
/**
* Initialize Zend database adapter
*
* @param string $dbname The name of the database to connect with
*
* @throws ConfigurationError In case the resource type is not a supported PDO driver name
*/
protected function _zendConnect($dbname)
{
if ($this->zendConn !== null) {
return;
}
$config = array(
'dbname' => $dbname,
'username' => $this->config['username'],
'password' => $this->config['password']
);
if ($this->config['db'] === 'mysql') {
$this->zendConn = new Zend_Db_Adapter_Pdo_Mysql($config);
} elseif ($this->config['db'] === 'pgsql') {
$this->zendConn = new Zend_Db_Adapter_Pdo_Pgsql($config);
} else {
throw new ConfigurationError(
'Failed to connect to database. Unsupported PDO driver "%s"',
$this->config['db']
);
}
}
/**
* Initialize PDO connection
*
* @param string $dbname The name of the database to connect with
*/
protected function _pdoConnect($dbname)
{
if ($this->pdoConn !== null) {
return;
}
$this->pdoConn = new PDO(
$this->buildDsn($this->config['db'], $dbname),
$this->config['username'],
$this->config['password'],
array(PDO::ATTR_TIMEOUT => 1, PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION)
);
}
/**
* Return a datasource name for the given database type and name
*
* @param string $dbtype
* @param string $dbname
*
* @return string
*
* @throws ConfigurationError In case the passed database type is not supported
*/
protected function buildDsn($dbtype, $dbname = null)
{
if ($dbtype === 'mysql') {
return 'mysql:host=' . $this->config['host'] . ';port=' . $this->config['port']
. ($dbname !== null ? ';dbname=' . $dbname : '');
} elseif ($dbtype === 'pgsql') {
return 'pgsql:host=' . $this->config['host'] . ';port=' . $this->config['port']
. ($dbname !== null ? ';dbname=' . $dbname : '');
} else {
throw new ConfigurationError(
'Failed to build data source name. Unsupported PDO driver "%s"',
$dbtype
);
}
}
/**
* Try to connect to the server and throw an exception if this fails
*
* @throws PDOException In case an error occurs that does not indicate that authentication failed
*/
public function checkConnectivity()
{
try {
$this->connectToHost();
} catch (PDOException $e) {
if ($this->config['db'] === 'mysql') {
$code = $e->getCode();
if ($code !== 1040 && $code !== 1045) {
throw $e;
}
} elseif ($this->config['db'] === 'pgsql') {
if (strpos($e->getMessage(), $this->config['username']) === false) {
throw $e;
}
}
}
}
/**
* Return the given identifier escaped with backticks
*
* @param string $identifier The identifier to escape
*
* @return string
*
* @throws LogicException In case there is no behaviour implemented for the current PDO driver
*/
public function quoteIdentifier($identifier)
{
if ($this->config['db'] === 'mysql') {
return '`' . str_replace('`', '``', $identifier) . '`';
} elseif ($this->config['db'] === 'pgsql') {
return '"' . str_replace('"', '""', $identifier) . '"';
} else {
throw new LogicException('Unable to quote identifier.');
}
}
/**
* Return the given value escaped as string
*
* @param mixed $value The value to escape
*
* @return string
*
* @throws LogicException In case there is no behaviour implemented for the current PDO driver
*/
public function quote($value)
{
$value = $this->pdoConn->quote($value);
if ($value === false) {
throw new LogicException('Unable to quote value');
}
return $value;
}
/**
* Execute a SQL statement and return the affected row count
*
* Use $params to use a prepared statement.
*
* @param string $statement The statement to execute
* @param array $params The params to bind
*
* @return int
*/
public function exec($statement, $params = array())
{
if (empty($params)) {
return $this->pdoConn->exec($statement);
}
$stmt = $this->pdoConn->prepare($statement);
$stmt->execute($params);
return $stmt->rowCount();
}
/**
* Execute a SQL statement and return the result
*
* Use $params to use a prepared statement.
*
* @param string $statement The statement to execute
* @param array $params The params to bind
*
* @return mixed
*/
public function query($statement, $params = array())
{
if ($this->zendConn !== null) {
return $this->zendConn->query($statement, $params);
}
if (empty($params)) {
return $this->pdoConn->query($statement);
}
$stmt = $this->pdoConn->prepare($statement);
$stmt->execute($params);
return $stmt;
}
/**
* Import the given SQL file
*
* @param string $filepath The file to import
*/
public function import($filepath)
{
$file = new File($filepath);
$content = join(PHP_EOL, iterator_to_array($file)); // There is no fread() before PHP 5.5 :(
foreach (explode(';', $content) as $statement) {
if (($statement = trim($statement)) !== '') {
$this->exec($statement);
}
}
}
/**
* Return whether the given privileges were granted
*
* @param array $privileges An array of strings with the required privilege names
*
* @return bool
*/
public function checkPrivileges(array $privileges, $table = null)
{
if ($this->config['db'] === 'mysql') {
return $this->checkMysqlPriv($privileges);
} else {
return $this->checkPgsqlPriv($privileges, $table);
}
}
/**
* Return a list of all existing database tables
*
* @return array
*/
public function listTables()
{
$this->assertConnectedToDb();
return $this->zendConn->listTables();
}
/**
* Return whether the given database login exists
*
* @param string $username The username to search
* @param string $password The password for user $username, required in case it's a MySQL database
*
* @return bool
*/
public function hasLogin($username, $password = null)
{
if ($this->config['db'] === 'mysql') {
// probe login by trial and error since we don't know our host name or it may be globbed
try {
$probeConf = $this->config;
$probeConf['username'] = $username;
$probeConf['password'] = $password;
$probe = new DbTool($probeConf);
$probe->connectToHost();
} catch (PDOException $e) {
return false;
}
return true;
} elseif ($this->config['db'] === 'pgsql') {
$rowCount = $this->exec(
'SELECT usename FROM pg_catalog.pg_user WHERE usename = :ident LIMIT 1',
array(':ident' => $username)
);
}
return $rowCount === 1;
}
/**
* Add a new database login
*
* @param string $username The username of the new login
* @param string $password The password of the new login
*/
public function addLogin($username, $password)
{
if ($this->config['db'] === 'mysql') {
$this->exec(
'CREATE USER :user@:host IDENTIFIED BY :passw',
array(':user' => $username, ':host' => '%', ':passw' => $password)
);
return true;
} elseif ($this->config['db'] === 'pgsql') {
$this->exec(sprintf(
'CREATE USER %s WITH PASSWORD %s',
$this->quoteIdentifier($username),
$this->quote($password)
));
return true;
}
}
/**
* Check whether the current role has GRANT permissions
*
* @param array $privileges
* @param $database
*/
public function checkMysqlGrantOption(array $privileges)
{
return $this->checkMysqlPriv($privileges, true);
}
/**
* Check whether the current user has the given global privileges
*
* @param array $privileges The privilege names
* @param boolean $requireGrants Only return true when all privileges can be granted to others
*
* @return bool
*/
public function checkMysqlPriv(array $privileges, $requireGrants = false)
{
$cnt = count($privileges);
if ($cnt <= 0) {
return true;
}
$grantOption = '';
if ($requireGrants) {
$grantOption = ' AND IS_GRANTABLE = \'YES\'';
}
$rows = $this->exec(
'SELECT PRIVILEGE_TYPE FROM information_schema.user_privileges ' .
' WHERE GRANTEE = CONCAT("\'", REPLACE(CURRENT_USER(), \'@\', "\'@\'"), "\'") ' .
' AND PRIVILEGE_TYPE IN (?' . str_repeat(',?', $cnt - 1) . ') ' . $grantOption . ';',
$privileges
);
return $cnt === $rows;
}
/**
* Check whether the current role has GRANT permissions for the given database name
*
* For Postgres, this will be assumed as true when:
* <ul>
* <li>The role can create new databases and the database does <b>not</b> yet exist </li>
* <li>The database exists but the current role is the owner of it</li>
* <li>The database exists but the role has superuser permissions</li>
* <li>The role does not own the database, but has the necessary grants on it</li>
* </ul>
* A more fine-grained check of schema, table and columns permissions in the database
* will not happen.
*
* WARNING: May reconnect to another database
*
* @param array $privileges
* @param $database The database
* @param $table The optional table
*
* @return bool
*/
public function checkPgsqlGrantOption(array $privileges, $database, $table = null)
{
if ($this->checkPgsqlPriv(array('SUPER'))) {
// superuser
return true;
}
$create = $this->checkPgsqlPriv(array('CREATE', 'CREATE USER'));
$owner = $this->query(sprintf(
'SELECT pg_catalog.pg_get_userbyid(datdba) FROM pg_database WHERE datname = %s',
$this->quote($database)
))->fetchColumn();
if ($owner !== false) {
if ($owner !== $this->config['username']) {
// database already exists and the user is not owner of the database
return $this->checkPgsqlPriv($privileges, $table, true);
} else {
// database already exists and the user is owner of the database
return true;
}
}
// database does not exist, permission depends on createdb and createrole permissions
return $create;
}
/**
* Check whether the current role has the given privileges
*
* NOTE: The only global role privileges in Postgres are SUPER (superuser), CREATE and CREATE USER
* (databases and roles), all others will be ignored in case no database was given
*
* @param array $privileges The privileges to check
* @param $table The optional schema to use, defaults to 'public'
* @param $withGrant Whether we also require the grant option on the given privileges
*
* @return bool
*/
public function checkPgsqlPriv(array $privileges, $table = null, $withGrantOption = false)
{
if (isset($table)) {
$queries = array();
foreach ($privileges as $privilege) {
if (false === array_search($privilege, array('CREATE USER', 'CREATE', 'SUPER'))) {
$queries[] = sprintf (
'has_table_privilege(%s, %s)',
$this->quote($table),
$this->quote($privilege . ($withGrantOption ? ' WITH GRANT OPTION' : ''))
) . ' AS ' . $this->quoteIdentifier($privilege);
}
}
$ret = $this->query('SELECT ' . join (', ', $queries) . ';')->fetch();
if (false === $ret || false !== array_search(false, $ret)) {
return false;
}
}
if (false !== array_search('CREATE USER', $privileges)) {
$query = $this->query('select rolcreaterole from pg_roles where rolname = current_user;');
$createrole = $query->fetchColumn();
if (false === $createrole) {
return false;
}
}
if (false !== array_search('CREATE', $privileges)) {
$query = $this->query('select rolcreatedb from pg_roles where rolname = current_user;');
$createdb = $query->fetchColumn();
if (false === $createdb) {
return false;
}
}
if (false !== array_search('SUPER', $privileges)) {
$query = $this->query('select rolsuper from pg_roles where rolname = current_user;');
$super = $query->fetchColumn();
if (false === $super) {
return false;
}
}
return true;
}
}