Library for detecting browser changes
This small library detects browser downgrades and major changes, including OS/browser family changes. It could be used as an indicator of user browser authenticity: if authentication cookies are used on downgraded browser, it might be restored from a backup.
Similarly, cookie that appears on completely different platform or browser is probably either stolen or copied. This check is not foolproof, as attacker can easily spoof user-agent too.
from browser_compare import * old_ua = 'Mozilla/5.0 (Windows NT 6.3; WOW64; rv:26.0) Gecko/20100101 Firefox/26.0' new_ua = 'Mozilla/5.0 (Windows NT 6.3; WOW64; rv:27.0) Gecko/20100101 Firefox/27.0' another_ua = 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:27.0) Gecko/20100101 Firefox/27.0' bc = BrowserCompare(old_ua, new_ua) print bc.compare() # True bc = BrowserCompare(new_ua, old_ua) print bc.compare() # raises UADowngradedException bc = BrowserCompare(old_ua, another_ua) print bc.compare() # raises UAChangedException
Use UAException to catch any problems with user-agents, if you don’t care why it was rejected. Additional information is available in exception.msg.
Licensed under MIT license:
Copyright (c) 2014 Olli jarva firstname.lastname@example.org
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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