add wifi analysis

content/blog/wifi_analysis.md

@@ -0,0 +1,23 @@
+---
+title: Wifi traffic analysis on a gugelfrei fon
+date: 2022-04-20
+---
+
+Is the gugelfrei fon really successfully degoogled? Is any data sent to the known data sinks? Maybe the IMSI number to the SUPL host? For that I conducted wifi network dump of the android startup procedure. Here you can see in sequence network connectivity check, time sync and download of assistance data for gps (A-GPS).
+
+For the test setup I opened up a wifi hotspot on my desktop with [hostapd](https://wiki.archlinux.org/title/Software_access_point).
+```
+ create_ap <wifi_device> <lan_device> <SSID> <PASSWORD>
+```
+
+Then I just sniffed on `<wifi_device>` with [wireshark](https://www.wireshark.org/).
+
+Tested device is a LG G3 d855 with [recent gugelfrei OS](https://cld.freedomhost.de/index.php/s/afgcJqXoDZQ8RCp).
+
+Results for captivity portal and timeserver:
+![wifi](/images/analysis/wifi_1.png)
+
+SUPL Server are not used. A-GPS data is fetched via XTRA Server:
+![wifi](/images/analysis/wifi_2.png)
+
+No traces of privacy violations here. See [full bootup wifi dump](/images/analysis/bootup.pcapng) for wireshark.

layouts/partials/custom_head.html

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 <script src="/contact-form/jquery-3.6.0.min.js"></script>
 <script src="/contact-form/form.js"></script>
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layouts/partials/footer.html

@@ -4,3 +4,14 @@
 © 2022, Johannes Winter<br>
 Find credits in the <a href="https://git.gugelfrei.de/websites/wntr/src/branch/main/README.md" target="_blank">gittea</a>
 {{ end }}
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