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>>> import cookielib >>> cj = cookielib.CookieJar() >>> cookie_opener = urllib2.build_opener(VerboseHTTPHandler, ... urllib2.HTTPCookieProcessor(cj)) Opening the Google front page will result in two different cookies getting set: >>> response = cookie_opener.open('http://www.google.com/') -------------------------------------------------GET / HTTP/1.1 ... -------------------- Response -------------------HTTP/1.1 200 OK ... Set-Cookie: PREF=ID=94381994af6d5c77:FF=0:TM=1288205983:LM=1288205983:S=Mtwivl7EB73uL5Ky; expires=Fri, 26-Oct-2012 18:59:43 GMT; path=/; domain=.google.com Set-Cookie: NID=40=rWLn_I8_PAhUF62J0yFLtb1-AoftgU0RvGSsa81FhTvd4vXD91iU5DOEdxSVt4otiISY3RfEYcGFHZA52w3-85p-hujagtB9akaLnS0QHEt2v8lkkelEGbpo7oWr9u5; expires=Thu, 28-Apr-2011 18:59:43 GMT; path=/; domain=.google.com; HttpOnly ... If you consult the cookielib documentation, you will find that you can do more than query and modify the cookies that have been set. You can also automatically store them in a file, so that they survive from one Python session to the next. You can even create cookie processors that implement your own custom policies with respect to which cookies to store and which to divulge. Note that if we visit another Google page the options page, for example then both of the cookies set previously get submitted in the same Cookie header, separated by a semicolon: >>> response = cookie_opener.open('http://www.google.com/intl/en/options/') -------------------------------------------------GET /intl/en/options/ HTTP/1.1 ... Cookie: PREF=ID=94381994af6d5c77:FF=0:TM=1288205983:LM=1288205983:S=Mtwivl7EB73uL5Ky; NID=40=rWLn_I8_PAhUF62J0yFLtb1-AoftgU0RvGSsa81FhTvd4vXD91iU5DOEdxSVt4otiISY3RfEYcGFHZA52w3-85p-hujagtB9akaLnS0QHEt2v8lkkelEGbpo7oWr9u5 ... -------------------- Response -------------------HTTP/1.1 200 OK ... Servers can constrain a cookie to a particular domain and path, in addition to setting a Max-age or expires time. Unfortunately, some browsers ignore this setting, so sites should never base their security on the assumption that the expires time will be obeyed. Therefore, servers can mark cookies as secure; this ensures that such cookies are only transmitted with HTTPS requests to the site and never in unsecure HTTP requests. We will see uses for this in the next session. Some browsers also obey a non-standard HttpOnly flag, which you can see in one of the Google cookies shown a moment ago. This flag hides the cookie from any JavaScript programs running on a web page. This is an attempt to make cross-site scripting attacks more difficult, as we will soon learn. Note that there are other mechanisms besides cookies available if a particularly aggressive domain wants to keep track of your activities; many of the best ideas have been combined in a project called evercookie : http://samy.pl/evercookie/ I do not recommend using these approaches in your own applications; instead, I recommend using standard cookies, so that intelligent users have at least a chance at opting to control your monitoring!
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But you should know that these other mechanisms exist if you are writing web clients, proxies, or even if you simply browse the Web yourself and are interested in controlling your identity.
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A perpetual problem with cookies is that web site designers do not seem to realize that cookies need to be protected as zealously as your username and password. While it is true that well-designed cookies expire and will no longer be accepted as valid by the server, cookies while they last give exactly as much access to a web site as a username and password. If someone can make requests to a site with your login cookie, the site will think it is you who has just logged in. Some sites do not protect cookies at all: they might require HTTPS for your username and password, but then return you to normal HTTP for the rest of your session. And with every HTTP request, your session cookies are transmitted in the clear for anyone to intercept and start using. Other sites are smart enough to protect subsequent page loads with HTTPS, even after you have left the login page, but they forget that static data from the same domain, like images, decorations, CSS files, and JavaScript source code, will also carry your cookie. The better alternatives are to either send all of that information over HTTPS, or to carefully serve it from a different domain or path that is outside the jurisdiction of the session cookie. And despite the fact this problem has existed for years, at the time of writing it is once again back in the news with the celebrated release of Firesheep. Sites need to learn that session cookies should always be marked as secure, so that browsers will not divulge them over insecure links. Earlier generations of browsers would refuse to cache content that came in over HTTPS, and that might be where some developers got into the habit of not encrypting most of their web site. But modern browsers will happily cache resources fetched over HTTPS some will even save it on disk if the Cachecontrol: header is set to public so there are no longer good reasons not to encrypt everything sent from a web site. Remember: If your users really need privacy, then exposing even what images, decorations, and JavaScript they are downloading might allow an observer to guess which pages they are visiting and which actions they are taking on your site. Should you happen to observe or capture a Cookie: header from an HTTP request that you observe, remember that there is no need to store it in a CookieJar or represent it as a cookielib object at all. Indeed, you could not do that anyway because the outgoing Cookie: header does not reveal the domain and path rules that the cookie was stored with. Instead, just inject the Cookie: header raw into the requests you make to the web site: request = urllib2.Request(url) request.add_header('Cookie', intercepted_value) info = urllib2.urlopen(request) As always, use your powers for good and not evil!
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