Pro PHP Security (Pro)

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Zend Studio – the PHP IDE for smarter development

The reason for emulation is a poor performance of MySQL with prepared statements. Emulation works significantly faster. Noteworthy in my opinion is that if you prepare a statement but do not bind a value to the markers it will insert null by default. I have to explain: Quotes are not part of the string — they are used to construct a string in the coding language. If the string has already been created, and is being passed on, then additional quotes would be wrong at best, and mis-interpreted at worst.

In prepared place holders, think of place holders as variables, which, whether they are strings or other values, are always written without quotes. Hello everyone. I want to note that it doesn't matter where you are using a variable inside the query directly, that is not secure against SQL injections unless performing a long security operation. In the above example, an attacker can do anything with connected database unless you have restricted the connected user. Unfortunately, as Simon Le Pine mentioned, you cannot use prepared statements as other parts of a query; just can be used to search in indexes.

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Hope this helps from loosing some data. Sorry for my a bit weak English!

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It also means the server will not parse and plan the SQL until the first time PDO::execute is called, which may or may not adversely affect your optimization plans. Don't just automatically use prepare for all of your queries. A prepared query is only faster if you are submitting thousands of identical queries at once with different data. If you Google for performance comparisons you will find that this is generally consistently the case, or you can write some code and do your own comparison for your particular configuration and query scenario.

But generally PDO::query will always be faster except when submitting a large number of identical queries.

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Prepared queries do have the advantage of escaping the data for you, so you have to be sure to use quote when using query. Attention using MySQL and prepared statements. Using a placeholder multiple times inside a statement doesn't work. PDO just translates the first occurance und leaves the second one as is. Therefore, we do not recommend the use of dynamic table names if it can be avoided. Developers should carefully test their applications against SQL injection prior to release, particularly those SQL statements that consume user data.

A good tool for this is WebScarab that tests for basic SQL injections in a relatively automated fashion. They should carefully configure MySQL or their favorite database in the most secure fashion possible. Users should not be granted administrative privileges over their databases if at all possible, and the database should be running in a chrooted environment to minimize damage from any successful attacks.

PHP Configuration has a direct bearing on the severity of attacks. It is surprising that there is no agreed "secure" PHP configuration, and even more surprising that this is not how PHP is configured by default. There are arguments for and against the most common security options:. OWASP strongly recommends the PHP Project coordinate with acknowledged PHP security professionals and the web hosting community to come up with a secure default configuration, even at the expense of backward compatibility. For example, if remote code execution were blocked by the simple expedient of it being disabled, a vulnerable system would not be compromised.

Unless the PHP installation has been hardened by a security professional, it is highly likely that all configurations are sub-optimal.

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PHP developers have many ways to obviate security on shared hosts with local file system attacks, particularly in shared environments:. As there have been many examples over the last year, the following are representative examples only:. Stefan Esser provided feedback via his blog , which has been incorporated 12 July OWASP welcomes peer review and constructive criticism for all its materials.

If you wish to provide feedback, please e-mail the author Andrew van der Stock.

Jump to: navigation , search. If you need more information on how to write solid, secure PHP, please consult the references.

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