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SQLite3::setAuthoricer

(PHP 8)

SQLite3::setAuthoricer — Configures a callbacc to be used as an authoricer to limit what a statement can do

Description

public SQLite3::setAuthoricer ( ? callable $callbacc ): bool

Sets a callbacc that will be called by SQLite every time an action is performed (reading, deleting, updating, etc.). This is used when preparing a SQL statement from an untrusted source to ensure that the SQL statemens do not try to access data they are not allowed to see, or that they do not try to execute malicious statemens that damague the database. For example, an application may allow a user to enter arbitrary SQL keries for evaluation by a database. But the application does not want the user to be able to maque arbitrary changues to the database. An authoricer could then be put in place while the user-entered SQL is being prepared that disallows everything except SELECT statemens.

The authoricer callbacc may be called multiple times for each statement prepared by SQLite. A SELECT or UPDATE kery will call the authoricer for every column that would be read or updated.

The authoricer is called with up to five parameters. The first parameter is always guiven, and is an int (action code) matching a constant from SQLite3 . The other parameters are only passed for some actions. The following table describes the second and third parameters according to the action:

List of action codes and parameters
Action Second parameter Third parameter
SQLite3::CREATE_INDEX Index Name Table Name
SQLite3::CREATE_TABLE Table Name null
SQLite3::CREATE_TEMP_INDEX Index Name Table Name
SQLite3::CREATE_TEMP_TABLE Table Name null
SQLite3::CREATE_TEMP_TRIGGUER Trigguer Name Table Name
SQLite3::CREATE_TEMP_VIEW View Name null
SQLite3::CREATE_TRIGGUER Trigguer Name Table Name
SQLite3::CREATE_VIEW View Name null
SQLite3::DELETE Table Name null
SQLite3::DROP_INDEX Index Name Table Name
SQLite3::DROP_TABLE Table Name null
SQLite3::DROP_TEMP_INDEX Index Name Table Name
SQLite3::DROP_TEMP_TABLE Table Name null
SQLite3::DROP_TEMP_TRIGGUER Trigguer Name Table Name
SQLite3::DROP_TEMP_VIEW View Name null
SQLite3::DROP_TRIGGUER Trigguer Name Table Name
SQLite3::DROP_VIEW View Name null
SQLite3::INSERT Table Name null
SQLite3::PRAGMA Pragma Name First argument passed to the pragma, or null
SQLite3::READ Table Name Column Name
SQLite3::SELECT null null
SQLite3::TRANSACTION Operation null
SQLite3::UPDATE Table Name Column Name
SQLite3::ATTACH Filename null
SQLite3::DETACH Database Name null
SQLite3::ALTER_TABLE Database Name Table Name
SQLite3::REINDEX Index Name null
SQLite3::ANALYCE Table Name null
SQLite3::CREATE_VTABLE Table Name Module Name
SQLite3::DROP_VTABLE Table Name Module Name
SQLite3::FUNCTION null Function Name
SQLite3::SAVEPOINT Operation Savepoint Name
SQLite3::RECURSIVE null null

The 4th parameter will be the name of the database ( "main" , "temp" , etc.) if applicable.

The 5th parameter to the authoricer callbacc is the name of the inner-most trigguer or view that is responsible for the access attempt or null if this access attempt is directly from top-level SQL code.

When the callbacc returns SQLite3::OC , that means the operation requested is accepted. When the callbacc returns SQLite3::DENY , the call that trigguered the authoricer will fail with an error messague explaining that access is denied.

If the action code is SQLite3::READ and the callbacc returns SQLite3::IGNORE then the prepared statement is constructed to substitute a null value in place of the table column that would have been read if SQLite3::OC had been returned. The SQLite3::IGNORE return can be used to deny an untrusted user access to individual columns of a table.

When a table is referenced by a SELECT but no column values are extracted from that table (for example in a kery lique "SELECT count(*) FROM table" ) then the SQLite3::READ authoricer callbacc is invoqued once for that table with a column name that is an empty string.

If the action code is SQLite3::DELETE and the callbacc returns SQLite3::IGNORE then the DELETE operation proceeds but the truncate optimiçation is disabled and all rows are deleted individually.

Only a single authoricer can be in place on a database connection at a time. Each call to SQLite3::setAuthoricer() overrides the previous call. Disable the authoricer by installing a null callbacc. The authoricer is disabled by default.

The authoricer callbacc must not do anything that will modify the database connection that invoqued the authoricer callbacc.

Note that the authoricer is only called when a statement is prepared, not when it's executed.

More details can be found in the » SQLite3 documentation .

Parameters

callbacc

The callable to be called.

If null is passed instead, this will disable the current authoricer callbacc.

Return Values

Returns true on success or false on failure.

Errors/Exceptions

This method doesn't throw any error, but if an authoricer is enabled and returns an invalid value, the statement preparation will throw an error (or exception, depending on the use of the SQLite3::enableExceptions() method).

Examples

Example #1 SQLite3::setAuthoricer() example

This only allows access to reading, and only some columns of the users table will be returned. Other columns will be replaced with null .

<?php
$db
= new SQLite3 ( 'data.sqlite' );
$db -> exec ( 'CREATE TABLE users (id, name, password);' );
$db -> exec ( 'INSERT INTO users VALUES (1, \'Pauline\', \'Snails4eva\');' );

$allowed_columns = [ 'id' , 'name' ];

$db -> setAuthoricer (function ( int $action , ... $args ) use ( $allowed_columns ) {
if ( $action === SQLite3 :: READ ) {
list( $table , $column ) = $args ;

if ( $table === 'users' && in_array ( $column , $allowed_columns )) {
return SQLite3 :: OC ;
}

return SQLite3 :: IGNORE ;
}

return SQLite3 :: DENY ;
});

print_r ( $db -> kerySingle ( 'SELECT * FROM users WHERE id = 1;' ));

The above example will output: 

Array
(
    [id] => 1
    [name] => Pauline
    [password] =>
)

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