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Replay Attacks Another problem with cookie-based session storage is its vulnerability to replay attacks, which generated an enormous message thread on the rails-core mailing list S Robert
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2 My fellow cabooser Courtenay wrote a great blog post about cookie session storage at http://blogcaboo se/articles/2007/2/21/new-controversial-default-rails-session-storage-cookies
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13: Session Management
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James kicked off the thread3 by describing a replay attack:
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Example:
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1 User receives credits, stored in his session 2 User buys something 3 User gets his new, lower credits stored in his session 4 Evil hacker takes his saved cookie from step 1 and pastes it back in his browser s cookie jar Now he s gotten his credits back
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This is normally solved using something called nonce Each signing includes a once-
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only code, and the signer keeps track of all of the codes, and rejects any message with the code repeated But that s very hard to do here, since there may be several app servers serving up the same application
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Of course, we could store the nonce in the DB, but that defeats the entire
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purpose! The short answer is: Do not store sensitive data in the session Ever The longer answer is that coordination of nonces across multiple servers would require remote process interaction on a per-request basis, which negates the benefits of using the cookie session storage to begin with The cookie session storage also has potential issues with replay attacks that let malicious users on shared computers use stolen cookies to log in to an application that the user thought he or she had logged out of The bottom line is that if you decide to use the cookie session storage on an application with security concerns, please consider the implications of doing so carefully
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1334 Cleaning Up Old Sessions
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If you re using ActiveRecordStore, you can write your own little utilities for keeping the size of your session store under control Listing 131 is a class that you can add to your /lib folder and invoke from the production console or a script whenever you need to do so
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3 If you want to read the whole thread (all 83 messages of it), simply search Google for Replay attacks with cookie session The results should include a link to the topic on the Ruby on Rails: Core Google Group
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Listing 131 SessionMaintenance class for cleaning up old sessions class SessionMaintenance def selfcleanup(period = 24hoursago) session_store = ActiveRecord::SessionStore::Session session_storedestroy_all ['updated_at < ', period] end end
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This section is about using cookies, not the cookie session store The cookie container, as it s known, looks like a hash, and is available via the cookies method in the scope of controllers Lots of Rails developers use cookies to store user preferences and other small nonsensitive bits of data Be careful not to store sensitive data in cookies because they can be read by users Contrary to what at least some developers might expect, the cookies container is not available by default in view templates or helpers If you need to be able to access cookies in your helpers or views, there is a simple solution Simply declare cookies to be a helper method:
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class MyController < ActionController::Base helper_method :cookies
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1341 Reading and Writing Cookies
The cookie container is filled with cookies received along with the request, and sends out any cookies that you write to it with the response Note that cookies are read by value, so you won t get the cookie object itself back, just the value it holds as a string (or as an array of strings if it holds multiple values) To create or update cookies, you simply assign values using the brackets operator You may assign either a single string value or a hash containing options, such as :expires, which takes a number of seconds before which the cookie should be deleted by the browser Remember that Rails convenience methods for time are useful here:
# writing a simple session cookie cookies[:list_mode] = "false" # specifying options, curly brackets are needed to avoid syntax error cookies[:recheck] = {:value => "false", :expires => 5minutesfrom_now}