Category Archives: Internet

Free airport WiFi

Most solutions for getting around the captive portals used in $7 airport wireless services involve sniffing the network and spoofing authenticated MAC addresses. An earlier research done by Felix Geisendörfer who discovered that some of these proxy systems are set up to allow pictures through before payment.

Presumably this is to allow external custom imagery and analytics tracking bugs to be accessed during the sign-in process. The funny thing is that the proxy allows files through based on a string comparison on the requested URL, and it’s easily fooled.

Without any hope of success I typed into my browser’s address bar while I was waiting for one of my friend to land on, and to my big surprise I saw the page you see when you follow the link right now. The next thing I typed in was: but that didn’t work. But I went on, and found that url’s like worked like a charm. I found that I could easily visit sites like slashdot, google, or even this weblog, when adding a ?.jpg at the end of the url. The next logical step was to automate that. I downloaded greasemonkey.xpi?.jpg (*g*) and wrote a 4 line js script that would add ?.jpg to every link in a document. That way I was able to browse most sites without a hassle.

I wonder how prolific this loophole is. Next time you’re in an airport (or a hotel), give it a shot and let us know how it works for you.

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Recover a Mac WIFI Password

There are a couple of ways to get to this data, including simply using the Keychain Access utility, but probably the easiest way to get to this specific data is to go through Airport System Preferences. Go into the Airport control area of Mac OS X and you’ll find a list of all the different networks you’ve successfully joined in the past, including those with and without passwords.

Open up System Preferences –> Network –> Airport –> Configure…:

Pick the network you need and click on the little “EDIT” button and a new window pops up with specific information on this network:

Click on the “Show Password” checkbox, and ….

The password is shown in hex but dont worry it’ll still work when you paste it into your new WIFI profile if you choose to create one.

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