- August 28, 2009
- 8 (after 8 ratings)
On WebFaction, each host has it's own Apache instance, with WebFaction's main Apache instance forwarding requests. This is very useful but means that some of the original information is lost. This middleware should be installed at the top of your list to restore this lost info.
It includes the functionality that used to be in SetRemoteAddrFromForwardedFor before it was removed from Django.
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class WebFactionFixes(object): """ Middleware that applies some fixes for people using the WebFaction hosting provider. In particular: * sets 'REMOTE_ADDR' based on 'HTTP_X_FORWARDED_FOR', if the latter is set. * Monkey patches request.is_secure() to respect HTTP_X_FORWARDED_SSL. ***PLEASE NOTE*** that this is not secure, since a user or an active network attacker could set X-Forwarded-SSL manually and the main WebFaction Apache/nginx instance does not remove it, so it will appear to be a secure request when it is not. For some applications, this could be a critical security flaw. For example, if users typical type in yourdomain.com into browsers, which will be HTTP by default and your app is supposed to redirect this to HTTPS, an active MITM attacher could add the X-Forwarded-Ssl header, causing the connection to procede over HTTP, leaking all your sensitive information. In this scenario, this middleware will be useful in protecting against passive network attackers, but not active network attackers. WebFaction currently have no work-around for this flaw, AFAIK. """ def process_request(self, request): # Fix REMOTE_ADDR try: real_ip = request.META['HTTP_X_FORWARDED_FOR'] except KeyError: pass else: # HTTP_X_FORWARDED_FOR can be a comma-separated list of IPs. The # client's IP will be the first one. real_ip = real_ip.split(",").strip() request.META['REMOTE_ADDR'] = real_ip # Fix HTTPS if 'HTTP_X_FORWARDED_SSL' in request.META: request.is_secure = lambda: request.META['HTTP_X_FORWARDED_SSL'] == 'on'
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