iSniff GPS is a passive wifi sniffing tool which sniffs for SSID probes, ARPs and MDNS (Bonjour) packets broadcast by nearby iPhones, iPads and other wireless devices. The aim is to collect data which can be used to identify each device and determine previous geographical locations, based solely on information each device discloses about previously joined WiFi networks.
iOS devices transmit ARPs which sometimes contain MAC addresses (BSSIDs) of previously joined WiFi networks, as described in here: Anatomy of a leak: how iPhones spill the ID of networks they access. iSniff GPS captures these ARPs and submits MAC addresses to Apple’s WiFi location service (masquerading as an iOS device) to obtain GPS coordinates for a given BSSID. If only SSID probes have been captured for a particular device, iSniff GPS can query network names on wigle.net and visualise possible locations.
By geo-locating multiple SSIDs and WiFi router MAC addresses, it is possible to determine where a device (and by implication its owner) is likely to have been.
iSniff GPS contains 2 major components and further python modules:
- iSniff_import.py uses Scapy to extract data from a live capture or pcap file and inserts it into a database (iSniff_GPS.sqlite3 by default).
- A Django web application provides a browser-based interface to view and analyse the data collected. This includes views of all detected devices and the SSIDs / BSSIDs each has probed for, a view by network, Google Maps views for visualising possible locations of a given BSSID or SSID, and a pie chart view showing a breakdown of the most popular device manufacturers based on client MAC address Ethernet OUIs.
- wloc.py provides a QueryBSSID() function which looks up a given BSSID (AP MAC address) on Apple’s WiFi location service. It will return the coordinates of the MAC queried for and usually an additional 400 nearby BSSIDs and their coordinates.
- wigle.py provides a getLocation() function for querying a given SSID on the wigle.net database and returns GPS coordinates. It must be configured with a valid wigle.net auth cookie. Please respect the wigle.net ToS in using this module.
You can download iSniff-GPS here:
Or read more here.