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I've seen lots of articles and questions about mysqli, and all of them claim that it protects against sql injections. But is it fool proof, or is there still some way to get around it. I'm not interested in cross site scripting or phishing attacks, only sql injections.
What I should have said to begin with is that I am using prepared statements. That is what I meant with mysqli. If I use prepared statements without any string concatenation, then is it foolproof?
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Parameterized queries solve SQL Injection vulnerabilities. This example uses PDO to fix the vulnerability but you can still use mysqli functions to prevent SQL Injection.
Another approach for avoiding SQL injections is using PHP Prepared Statements. A prepared statement is a feature in PHP which enables users to execute similar SQL queries efficiently and repeatedly.
Developers can prevent SQL Injection vulnerabilities in web applications by utilizing parameterized database queries with bound, typed parameters and careful use of parameterized stored procedures in the database. This can be accomplished in a variety of programming languages including Java, . NET, PHP, and more.
All you need to do is use the mouthful of a function, mysql_real_escape_string . mysql_real_escape_string takes a string that is going to be used in a MySQL query and return the same string with all SQL injection attempts safely escaped.
But is it fool proof, or is there still some way to get around it.
No, you have to know what you're doing. If you use bound parameters (A feature that MySqli comes with), you are completely safe from injection type attacks from this attack vector. This doesn't prevent you - the programmer - from embedding strings directly, and thereby enabling injection attacks. You have to use the feature as intended.
What I should have said to begin with is that I am using prepared statements. That is what I meant with mysqli. If I use prepared statements without any string concatenation, then is it foolproof?
Foolproof is still such a dangerous word. But you are safe from injection attacks for the variables that are bound through prepared statements. This is because bound parameters are transmitted separately from the SQL query. With the "traditional" embed-string approach, the database server needs to parse the input and there are lots of edge cases in that (Charsets etc.). When the data and the query are sent separate, there is no actual parsing going on (At least not parsing of the variable data).
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