MySQL

SQL Injection -measures for prevention

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Join Date: Sep 2009

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ultras1

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SQL Injection -measures for prevention

33 Days Ago

Hi, I'm making litle CMS with PHP+Mysql. Can you tellme measures for prevention for SQL Injections ?

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Join Date: Aug 2007

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smartness

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31 Days Ago

--> mysql_real_escape_string

--> Use htmlentities() for user submitted data!

when you get the id from the url:
$id = $_GET["id"];
use this:
$id = (int)$_GET["id"];

this is only when the ID is a integer!

I would suggest using a php mysql class!

Last edited by smartness; 31 Days Ago at 2:54 pm.

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Join Date: Sep 2009

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kylegetson kylegetson is offline

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31 Days Ago

using php base64_encode and php base64_decode can help as well.

never run a query on data you unsure about.

also, its a good idea to restrict the permissions of the mysql user your scripts are using, so in case someone does get in, they can't create, alter or drop tables. require an additional login before allowing those type of queries.

backup early. backup often.

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Join Date: Sep 2009

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ultras1

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30 Days Ago

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Originally Posted by smartness

when you get the id from the url:
$id = $_GET["id"];
use this:
$id = (int)$_GET["id"];

this is only when the ID is a integer!

Interesting

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Originally Posted by kylegetson

using php base64_encode and php base64_decode can help as well.

I had never known about that, it looks interesting. For example if I have "index.php?id=33&page=1" . What to encode? I guess "id=33&page=1" ?

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kylegetson kylegetson is offline

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30 Days Ago

When creating links use:

 Help with Code Tags 
 MySQL Syntax (Toggle Plain Text) 
$id=33;
$page=1;
$link = "index.php?id=".base64_encode($id)."&page=".base64_encode($page);
$id=33;
$page=1;
$link = "index.php?id=".base64_encode($id)."&page=".base64_encode($page);

Then when getting those variables:

 Help with Code Tags 
 MySQL Syntax (Toggle Plain Text) 
$id = base64_decode($_GET['id']);
$page = base64_decode($_GET['page']);
$id = base64_decode($_GET['id']);
$page = base64_decode($_GET['page']);

hope that helps.

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