search

offensive-security / kali-arm-build-scripts

Kali Linux ARM build scripts
874 stars 374 forks source link

rpi0: g_serial and /dev/ttyGS0 #151

Closed rmoriz closed 5 years ago

rmoriz commented 5 years ago

Raspberry Pi Zero provides nice OTG modes to use ethernet or serial over USB/OTG. A good documentation is available at https://gist.github.com/gbaman/50b6cca61dd1c3f88f41

This is very handy in headless usage/install, especially when wifi is not working/available.

However when enabled, the device is /dev/ttyGS0 and is not whitelisted by default in /etc/securetty. So root can't log in. Given that kali has no non-root user by default (like pi in stock Raspbian) this prevents login:

Jun 22 11:15:04 kali login[306]: pam_securetty(login:auth): access denied: tty '/dev/ttyGS0' is not secure !
Jun 22 11:15:08 kali login[306]: FAILED LOGIN (1) on '/dev/ttyGS0' FOR 'root', Authentication failure
steev commented 5 years ago

Interesting find. I'll see about adding this in for the next release!

steev commented 5 years ago

I've pushed this to the rpi0w script so it will be in the 2019.1 release.