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Create Bulletproof Sessions |
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| In the first part of this series we went over how a cookie works and what can be done to secure them. In this section we're going to go over ways to add additional security to the session beyond the cookie itself By the end of this article we will written our own wrapper class for "session_start" that protects our session from a number of attacks while taking into account some of the unique challenges presented by modern ajax-heavy websites. |
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Session Specific Attacks |
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Through the use of sessions your identity is maintained as you use a website, and just as in real life identity theft is a concern. By taking over your session an attacker would essentially become you on a website, with access to all of the actions, information and privileges that entails.
The main thing that an attacker needs to steal a session is the session ID. There are three ways an attacker normally goings about doing this, all of which can be protected against but are, by default, completely open. |
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| -› Guess the ID: most session handlers generate ids that make this impractical. |
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| -› Set the ID: rather than steal or guess the ID an attacker may try and set it to a value they choose. |
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| -› Steal the ID: by using malware, sniffing the network, or exploiting javascript exploits attackers can get the value from the cookie itself. |
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Starting the Session |
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The default session setup is not at all secure by itself, so we’re going to create a wrapper to add the security we need. To make this code more portable we’re going to build it as a static function of a php class called SessionManager.
To begin our sessionStart function is going to set the name cookie options for the session. Like all cookies we’re going to need to make some decisions about what is going to need access to the session ID. Since these options depend on the application itself lets add arguments we can change based on our specific needs.
For security we can hardcode the “HttpOnly” argument, as session ids are often the juiciest target for cross site scripting attacks. |
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