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<?php
namespace PHPixie\DB\PDOV;
use PHPixie\DB;
use VulnModule\DataType\ArrayObject;
use VulnModule\Vulnerability\XSS;
use VulnModule\VulnerableField;
/**
* PDO implementation of the database Query
* @property Connection $_db
* @package Database
*/
class Query extends DB\Query
{
/**
* Type of the database, e.g. mysql, pgsql etc.
* @var string
*/
protected $_db_type;
/**
* Character to use for quoting fields
* @var string
*/
protected $_quote;
/**
* Settings for the current query
* @var string
*/
protected $_settings;
/**
* Maps alias names to table names
* @var array
*/
protected $_aliases = [];
/**
* @var bool
*/
protected $isRoot = true;
/**
* @var null|Query
*/
protected $parent = null;
/**
* @var \SplObjectStorage
*/
protected $vulnFields;
/**
* Creates a new query object, checks which driver we are using and set the character used for quoting
*
* @param \PHPixie\DB $db Database connection
* @param string $type Query type. Available types: select, update, insert, delete, count
* @return \PHPixie\DB\PDOV\Query
@see \PHPixie\DB\Query::__construct()
*/
public function __construct($db, $type) {
parent::__construct($db, $type);
$this->_db_type = $this->_db->db_type;
$this->_quote = $this->_db_type == 'mysql' ? '`' : '"';
$this->vulnFields = new \SplObjectStorage();
$this->methods['limit'] = array('integer', 'NULL', 'string');
$this->methods['offset'] = array('integer', 'NULL', 'string');
}
/**
* Set/get settings for the execute query.
*
* @param string $val String to be enclosed in quotes
* @return string String surrounded with quotes
*/
public function settings($val = null) {
if ($val != null) {
$this->_settings = $val;
}
return $this->_settings;
}
/**
* Puts quotes around a string
*
* @param string $str String to be enclosed in quotes
* @return string String surrounded with quotes
*/
protected function quote($str) {
return $this->_quote . $str . $this->_quote;
}
/**
* If a string is passed escapes a field by enclosing it in specified quotes.
* If you pass an \PHPixie\DB\Expression object the value will be inserted into the query unescaped
*
* @param mixed $field Field to be escaped or an \PHPixie\DB\Expression object
* if the field must not be escaped
* @param bool $prepend_table
* @return string Escaped field representation
* @see \PHPixie\DB\Expression
*/
public function escape_field($field, $prepend_table = true) {
if (is_object($field) && $field instanceof DB\Expression) {
return $field->value;
}
$field = explode('.', $field);
if (count($field) == 1) {
if(!$prepend_table)
return $this->quote($field[0]);
array_unshift($field, $this->last_alias());
}
$str = $this->quote($field[0]) . '.';
if (trim($field[1]) == '*') {
return $str . '*';
}
return $str . $this->quote($field[1]);
}
/**
* Replaces the value with ? and appends it to the parameters array
* If you pass an \PHPixie\DB\Expression object the value will be inserted into the query unescaped
*
* @param mixed $val Value to be escaped or an \PHPixie\DB\Expression object
* if the value must not be escaped
* @param array &$params Reference to parameters array
* @return string Escaped value representation
*/
public function escape_value($val, &$params/*, $columnName = null*/) {
if ($val instanceof DB\Expression) {
return $val->value;
}
if ($val instanceof DB\Query) {
return $this->subquery($val, $params);
}
if ($val instanceof VulnerableField) {
$this->vulnFields->attach($val);
if (!($params['vuln_fields'] instanceof ArrayObject)) {
$params['vuln_fields'] = new ArrayObject(is_array($params['vuln_fields']) ? $params['vuln_fields'] : []);
}
if (!$params['vuln_fields']->contains($val)) {
$params['vuln_fields'][] = $val;
}
$filteredVal = $val->getFilteredValue();
if ($val->isVulnerableTo('SQL')) {
return "'" . $filteredVal . "'";
} else {
$params[] = $filteredVal;
return '?';
}
}
$params[] = $val;
return '?';
}
/**
* Gets the SQL for a subquery and appends its parameters to current ones
*
* @param Query $query Query builder for the subquery
* @param array &$params Reference to parameters array
* @return string Subquery SQL
*/
protected function subquery($query, &$params) {
$query->setIsRoot(false);
$query->setParent($this);
$query = $query->query();
$params = array_merge($params, $query[1]);
return "({$query[0]}) ";
}
/**
* Gets the SQL for a table to select from
*
* @param string|DB\Expression|DB\Query|array $table Table representation
* @param array &$params Reference to parameters array
* @throws \Exception
* @internal param $string &alias Alias for this table
* @return string Table SQL
*/
public function escape_table($table, &$params) {
$alias = null;
if (is_array($table)) {
$alias = $table[1];
$table = $table[0];
}
$this->getRootQuery()->addUsedAlias($alias);
if (is_string($table)) {
$table = $this->quote($table);
if ($alias != null)
$table.= " AS {$alias}";
return $table;
}
if ($alias == null) {
$alias = $this->last_alias();
$this->getRootQuery()->addUsedAlias($alias);
}
if ($table instanceof DB\Query)
return "{$this->subquery($table, $params)} AS {$alias}";
if ($table instanceof DB\Expression)
return "({$table->value}) AS {$alias}";
throw new \Exception("Parameter type " . get_class($table) . " cannot be used as a table");
}
/**
* Builds a query and fills the $params array with parameter values
*
* @throws \Exception
* @return array An array with a prepared query string and an array of parameters
*/
public function query() {
$query = '';
$params = array();
if (!$this->parent) {
$this->_aliases = [];
}
if ($this->_type == 'insert') {
$query .= "INSERT INTO {$this->escape_table($this->_table, $params)} ";
if (empty($this->_data) && $this->_db_type == 'pgsql') {
$query.= "DEFAULT VALUES ";
} else {
if (isset($this->_data[0]) && is_array($this->_data[0])) { // Batch insert
$first_row = true;
$columns_array = array();
foreach ($this->_data as $row) {
$columns = '';
$values = '';
$first = true;
if ($first_row) {
foreach ($row as $key => $val) {
if (!$first) {
$values .= ', ';
$columns .= ', ';
} else {
$first = false;
}
$columns .= $this->quote($key);
$columns_array[] = $key;
$values .= $this->escape_value($val, $params, $key);
}
$query .= "({$columns}) VALUES({$values})";
} else {
foreach ($columns_array as $col) {
if (!$first) {
$values .= ', ';
} else {
$first = false;
}
$values .= $this->escape_value($row[$col], $params, $col);
}
$query .= ", ({$values})";
}
$first_row = false;
}
} else {
$columns = '';
$values = '';
$first = true;
foreach ($this->_data as $key => $val) {
if (!$first) {
$values .= ', ';
$columns .= ', ';
} else {
$first = false;
}
$columns .= $this->quote($key);
$values .= $this->escape_value($val, $params, $key);
}
$query .= "({$columns}) VALUES({$values})";
}
}
} else {
if ($this->_type == 'select') {
$query .= "SELECT ";
if ($this->_fields == null) {
$query .= "* ";
} else {
$first = true;
foreach ($this->_fields as $f) {
if (!$first) {
$query .= ", ";
} else {
$first = false;
}
if (is_array($f)) {
$query .= "{$this->escape_field($f[0])} AS {$f[1]} ";
} else {
$query .= "{$this->escape_field($f)} ";
}
}
}
if (!empty($this->_table))
$query .= "FROM {$this->escape_table($this->_table, $params)} ";
}
if ($this->_type == 'count') {
$query .= "SELECT COUNT(*) as {$this->quote('count')} FROM {$this->escape_table($this->_table, $params)} ";
}
if ($this->_type == 'delete') {
if ($this->_db_type != 'sqlite') {
$query .= "DELETE {$this->last_alias()}.* FROM {$this->escape_table($this->_table, $params)} ";
} else {
if (!empty($this->_joins)) {
throw new \Exception("SQLite doesn't support deleting a table with JOIN in the query");
}
$query .= "DELETE FROM {$this->escape_table($this->_table, $params)} ";
}
}
if ($this->_type == 'update') {
$query .= "UPDATE {$this->escape_table($this->_table, $params)} ";
}
$joinedTables = [];
foreach ($this->_joins as $join) {
$table = $join[0];
$table = $this->escape_table($table, $params);
if (in_array($table, $joinedTables)) {
continue;
}
$query .= strtoupper($join[1]) . " JOIN {$table} ";
if (!empty($join[2]))
$query.="ON {$this->get_condition_query($join[2], $params, true, true)} ";
$joinedTables[] = $table;
}
if ($this->_type == 'update') {
$query.= "SET ";
$first = true;
foreach ($this->_data as $key => $val) {
if (!$first) {
$query.=", ";
} else {
$first = false;
}
$query .= "{$this->quote($key)} = {$this->escape_value($val, $params, $key)}";
}
$query .= " ";
}
if (!empty($this->_conditions)) {
$query .= "WHERE {$this->get_condition_query($this->_conditions, $params, true)} ";
}
if (($this->_type == 'select' || $this->_type == 'count') && $this->_group_by != null) {
$query .= "GROUP BY {$this->escape_field($this->_group_by)} ";
}
if (($this->_type == 'select' || $this->_type == 'count') && !empty($this->_having)) {
$query .= "HAVING {$this->get_condition_query($this->_having, $params, true)} ";
}
if ($this->_type == 'select' && !empty($this->_order_by)) {
$query .= "ORDER BY ";
$first = true;
foreach ($this->_order_by as $order) {
if (!$first) {
$query .= ',';
} else {
$first = false;
}
$query .= $this->escape_field($order[0]) . " ";
if (isset($order[1])) {
$dir = strtoupper($order[1]);
$query .= $dir . " ";
}
}
}
if (count($this->_union) > 0 && ($this->_type == 'select')) {
$query = "({$query}) ";
foreach ($this->_union as $union) {
$query .= $union[1] ? "UNION ALL " : "UNION ";
if ($union[0] instanceof DB\Query) {
$query .= $this->subquery($union[0], $params);
} elseif ($union[0] instanceof DB\Expression) {
$query .= "({$union[0]->value}) ";
} else {
throw new \Exception("You can only use query builder instances or \$pixie->db->expr() for unions");
}
}
}
if ($this->_type != 'count') {
if ($this->_limit != null) {
$query .= "LIMIT {$this->_limit} ";
}
if ($this->_offset != null) {
$query .= "OFFSET {$this->_offset} ";
}
}
}
return array($query, $params);
}
/**
* Recursively parses conditions array into a query string
*
* @param array $p Element of the cobditions array
* @param array &$params Reference to parameters array
* @param boolean $skip_first_operator Flag to skip the first logical operator in a query
* to prevent AND or OR to be at the beginning of the query
* @param boolean $value_is_field Flag if the the value in the logical operations should
* be treated as a field. E.g. for joins where the fields are
* compared between themselves and not with actual values
* @return string String representation of the conditions
* @throws \Exception If condition cannot be parsed
*/
public function get_condition_query($p, &$params, $skip_first_operator, $value_is_field = false) {
if (isset($p['field'])) {
if ($value_is_field) {
$param = $this->escape_field($p['value']);
} else {
$param = $this->escape_value($p['value'], $params, $p['field']);
}
return $this->escape_field($p['field']) . ' ' . $p['operator'] . ' ' . $param;
}
if (isset($p['logic'])) {
return ($skip_first_operator ? '' : strtoupper($p['logic']) . ' ')
. $this->get_condition_query($p['conditions'], $params, false, $value_is_field);
}
$conds = '';
$skip = $skip_first_operator || (count($p) > 1);
foreach ($p as $q) {
$conds .= $this->get_condition_query($q, $params, $skip, $value_is_field) . ' ';
$skip = false;
}
if (count($p) > 1 && !$skip_first_operator) {
return "( " . $conds . ")";
}
return $conds;
//throw new \Exception("Cannot parse condition:\n" . var_export($p, true));
}
/**
* @return \VulnModule\VulnInjection\Service
*/
public function getVulnService()
{
return $this->_db->pixie->getVulnService();
}
/**
* @param boolean $isRoot
*/
public function setIsRoot($isRoot)
{
$this->isRoot = !!$isRoot;
}
/**
* @return null|Query
*/
public function getRootQuery()
{
return $this->parent ? $this->parent->getRootQuery() : $this;
}
/**
* @return null
*/
public function getParent()
{
return $this->parent;
}
/**
* @param null $parent
*/
public function setParent($parent)
{
$this->parent = $parent;
}
/**
* @return array
*/
public function getUsedAliases()
{
return $this->_aliases;
}
public function addUsedAlias($alias)
{
if (!$alias) {
return;
}
if (!in_array($alias, $this->_aliases)) {
$this->_aliases[] = $alias;
}
}
public function where()
{
$params = func_get_args();
if (func_num_args() == 3) {
if (is_null($params[2])) {
if ($params[1] == '=') {
$params[1] = 'IS';
$params[2] = new DB\Expression('NULL');
} else if (in_array($params[1], ['<', '>', '<=', '>='])) {
$params[2] = 0;
}
} else if ($params[2] === 0) {
$params[2] = '0';
}
}
return call_user_func_array('parent::where', $params);
}
}
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