mirror of
https://github.com/sqlmapproject/sqlmap.git
synced 2024-11-23 10:03:47 +03:00
208 lines
7.0 KiB
HTML
208 lines
7.0 KiB
HTML
|
<?xml version="1.0" encoding="UTF-8" ?>
|
||
|
|
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
|
||
|
|
<html xmlns="http://www.w3.org/1999/xhtml">
|
||
|
|
<head>
|
||
|
|
<link rel="stylesheet" type="text/css" href="../mysqludf.css"/>
|
||
|
|
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
|
||
|
|
<title>lib_mysqludf_sys - A library of MySQL UDFs for working with the environment in which MySQL runs</title>
|
||
|
|
</head>
|
||
|
|
<body>
|
||
|
|
<div>
|
||
|
|
<a href="../index.html">Top</a>
|
||
|
|
| <a href="../mysql_udf_repository_libraries.html">Up</a>
|
||
|
|
</div>
|
||
|
|
<h1>lib_mysqludf_sys</h1>
|
||
|
|
<div>
|
||
|
|
<a href="lib_mysqludf_sys.html">Documentation</a>
|
||
|
|
| <a href="lib_mysqludf_sys.so">Binary</a>
|
||
|
|
| <a href="lib_mysqludf_sys.sql">Installation</a>
|
||
|
|
| <a href="lib_mysqludf_sys.c">Source</a>
|
||
|
|
| <a href="lib_mysqludf_sys_0.0.2.tar.gz">tar.gz</a>
|
||
|
|
</div>
|
||
|
|
<p>
|
||
|
|
This library <code>lib_mysqludf_sys</code> contains a number of functions that allows one to interact with the operating system.
|
||
|
|
</p>
|
||
|
|
<ol>
|
||
|
|
<li><a href="#sys_exec"><code>sys_exec</code></a> - executes an arbitrary command, and can thus be used to launch an external application.</li>
|
||
|
|
<li><a href="#sys_get"><code>sys_get</code></a> - gets the value of an environment variable.</li>
|
||
|
|
<li><a href="#sys_set"><code>sys_set</code></a> - create an environment variable, or update the value of an existing environment variable.</li>
|
||
|
|
</ol>
|
||
|
|
<p>
|
||
|
|
Use <a href="#lib_mysqludf_sys_info"><code>lib_mysqludf_sys_info()</code></a> to obtain information about the currently installed version of <code>lib_mysqludf_sys</code>.
|
||
|
|
</p>
|
||
|
|
|
||
|
|
<a name="sys_exec"></a><h2>sys_exec</h2>
|
||
|
|
<p>
|
||
|
|
<code>sys_exec</code> takes one command string argument and executes it.
|
||
|
|
</p>
|
||
|
|
<h3>Syntax</h3>
|
||
|
|
<pre>sys_exec(<b>arg1</b>)</pre>
|
||
|
|
<h3>Parameters and Return Values</h3>
|
||
|
|
<dl>
|
||
|
|
<dt><code><b>arg1</b></code></dt>
|
||
|
|
<dd>
|
||
|
|
A command string valid for the current operating system or execution environment.
|
||
|
|
</dd>
|
||
|
|
<dt>returns</dt>
|
||
|
|
<dd>
|
||
|
|
An (integer) exit code returned by the executed process.
|
||
|
|
</dd>
|
||
|
|
</dl>
|
||
|
|
<h3>Installation</h3>
|
||
|
|
<p>
|
||
|
|
Place the shared library binary in an appropriate location.
|
||
|
|
Log in to mysql as root or as another user with sufficient privileges, and select any database.
|
||
|
|
Then, create the function using the following DDL statement:
|
||
|
|
</p>
|
||
|
|
<pre>
|
||
|
|
CREATE FUNCTION sys_exec RETURNS INT SONAME 'lib_mysqludf_sys.so';
|
||
|
|
</pre>
|
||
|
|
<p>
|
||
|
|
The function will be globally available in all databases.
|
||
|
|
</p>
|
||
|
|
<p>
|
||
|
|
The deinstall the function, run the following statement:
|
||
|
|
</p>
|
||
|
|
<pre>
|
||
|
|
DROP FUNCTION sys_exec;
|
||
|
|
</pre>
|
||
|
|
<h3>Examples</h3>
|
||
|
|
<p>
|
||
|
|
None yet
|
||
|
|
</p>
|
||
|
|
<h3>A Note of Caution</h3>
|
||
|
|
<p>
|
||
|
|
Be very careful in deciding whether you need this function.
|
||
|
|
UDFs are available to all database users - you cannot grant EXECUTE privileges for them.
|
||
|
|
As the commandstring passed to <code>sys_exec</code> can do pretty much everything,
|
||
|
|
exposing the function poses a very real security hazard.
|
||
|
|
</p>
|
||
|
|
<p>
|
||
|
|
Even for a benign user, it is possible to accidentally do a lot of damage with it.
|
||
|
|
The call will be executed with the privileges of the os user that runs MySQL,
|
||
|
|
so it is entirely feasible to delete MySQL's data directory, or worse.
|
||
|
|
</p>
|
||
|
|
<p>
|
||
|
|
The function is intended for specialized MySQL applications where one needs extended
|
||
|
|
control over the operating system.
|
||
|
|
Currently, we do not have UDF's for ftp, email and http,
|
||
|
|
and this function can be used to implement such functionality in case it is really necessary
|
||
|
|
(datawarehouse staging areas could be a case in example).
|
||
|
|
</p>
|
||
|
|
<p>
|
||
|
|
You have been warned! If you don't see the hazard, please don't try to find it; just trust me on this.
|
||
|
|
</p>
|
||
|
|
<a name="sys_get"></a><h2>sys_get</h2>
|
||
|
|
<p>
|
||
|
|
<code>sys_get</code> takes the name of an environment variable and returns the value of the variable.
|
||
|
|
</p>
|
||
|
|
<h3>Syntax</h3>
|
||
|
|
<pre>sys_get([<b>arg1</b>)</pre>
|
||
|
|
<h3>Parameters and Return Values</h3>
|
||
|
|
<dl>
|
||
|
|
<dt><code><b>arg1</b></code></dt>
|
||
|
|
<dd>
|
||
|
|
A string that denotes the name of an environment value.
|
||
|
|
</dd>
|
||
|
|
<dt>returns</dt>
|
||
|
|
<dd>
|
||
|
|
If the variable exists, a string containing the value of the environment variable.
|
||
|
|
If the variable does not exist, the function return NULL.
|
||
|
|
</dd>
|
||
|
|
</dl>
|
||
|
|
<h3>Installation</h3>
|
||
|
|
<p>
|
||
|
|
Place the shared library binary in an appropriate location.
|
||
|
|
Log in to mysql as root or as another user with sufficient privileges, and select any database.
|
||
|
|
Then, create the function using the following DDL statement:
|
||
|
|
</p>
|
||
|
|
<pre>
|
||
|
|
CREATE FUNCTION sys_get RETURNS STRING SONAME 'lib_mysqludf_sys.so';
|
||
|
|
</pre>
|
||
|
|
<p>
|
||
|
|
The function will be globally available in all databases.
|
||
|
|
</p>
|
||
|
|
<p>
|
||
|
|
The deinstall the function, run the following statement:
|
||
|
|
</p>
|
||
|
|
<pre>
|
||
|
|
DROP FUNCTION sys_get;
|
||
|
|
</pre>
|
||
|
|
<h3>Examples</h3>
|
||
|
|
<p>
|
||
|
|
None yet
|
||
|
|
</p>
|
||
|
|
<h3>A Note of Caution</h3>
|
||
|
|
<p>
|
||
|
|
Be very careful in deciding whether you need this function.
|
||
|
|
UDFs are available to all database users - you cannot grant EXECUTE privileges for them.
|
||
|
|
The variables known in the environment where mysql runs are freely accessible using this function.
|
||
|
|
Any user can get access to potentially secret information, such as
|
||
|
|
the user that is running mysqld, the path of the user's home directory etc.
|
||
|
|
</p>
|
||
|
|
<p>
|
||
|
|
The function is intended for specialized MySQL applications where one needs extended
|
||
|
|
control over the operating system.
|
||
|
|
</p>
|
||
|
|
<p>
|
||
|
|
You have been warned! If you don't see the hazard, please don't try to find it; just trust me on this.
|
||
|
|
</p>
|
||
|
|
<a name="sys_set"></a><h2>sys_set</h2>
|
||
|
|
<p>
|
||
|
|
<code>sys_get</code> takes the name of an environment variable and returns the value of the variable.
|
||
|
|
</p>
|
||
|
|
<h3>Syntax</h3>
|
||
|
|
<pre>sys_set([<b>arg1, arg2</b>)</pre>
|
||
|
|
<h3>Parameters and Return Values</h3>
|
||
|
|
<dl>
|
||
|
|
<dt><code><b>arg1</b></code></dt>
|
||
|
|
<dd>
|
||
|
|
A string that denotes the name of an environment value.
|
||
|
|
</dd>
|
||
|
|
<dt><code><b>arg2</b></code></dt>
|
||
|
|
<dd>
|
||
|
|
An expression that contains the value that is to be assigned to the environment variable.
|
||
|
|
</dd>
|
||
|
|
<dt>returns</dt>
|
||
|
|
<dd>
|
||
|
|
0 if the assignment or creation succeed.
|
||
|
|
non-zero otherwise.
|
||
|
|
</dd>
|
||
|
|
</dl>
|
||
|
|
<h3>Installation</h3>
|
||
|
|
<p>
|
||
|
|
Place the shared library binary in an appropriate location.
|
||
|
|
Log in to mysql as root or as another user with sufficient privileges, and select any database.
|
||
|
|
Then, create the function using the following DDL statement:
|
||
|
|
</p>
|
||
|
|
<pre>
|
||
|
|
CREATE FUNCTION sys_set RETURNS STRING SONAME 'lib_mysqludf_sys.so';
|
||
|
|
</pre>
|
||
|
|
<p>
|
||
|
|
The function will be globally available in all databases.
|
||
|
|
</p>
|
||
|
|
<p>
|
||
|
|
The deinstall the function, run the following statement:
|
||
|
|
</p>
|
||
|
|
<pre>
|
||
|
|
DROP FUNCTION sys_set;
|
||
|
|
</pre>
|
||
|
|
<h3>Examples</h3>
|
||
|
|
<p>
|
||
|
|
None yet
|
||
|
|
</p>
|
||
|
|
<h3>A Note of Caution</h3>
|
||
|
|
<p>
|
||
|
|
Be very careful in deciding whether you need this function.
|
||
|
|
UDFs are available to all database users - you cannot grant EXECUTE privileges for them.
|
||
|
|
This function will overwrite existing environment variables.
|
||
|
|
</p>
|
||
|
|
<p>
|
||
|
|
The function is intended for specialized MySQL applications where one needs extended
|
||
|
|
control over the operating system.
|
||
|
|
</p>
|
||
|
|
<p>
|
||
|
|
You have been warned! If you don't see the hazard, please don't try to find it; just trust me on this.
|
||
|
|
</p>
|
||
|
|
</body>
|
||
|
|
</html
|