SailfishOS Android Signature Spoofing

This is a compiled set of instructions and tools wrapped in Docker image to fetch, deodex, patch and upload back AlienDalvik files on Sailfish phones.

Most of the existing tools assume adb as transport. In Sailfish it's a bit tricky so I replaced it with Rsync. Please note that Rsync is run in completely insecure manner, so don't leave it running in public unprotected networks.

Overview of the steps performed by the scripts:

• fetch via rsync /opt/alien/system/{framework,app,priv-app}
• deodex using simple-deodexer
• apply hook and core patches from haystack
• push back changed files, saving backups in /opt/alien/system/{framework,app,priv-app}.pre_haystack

Instructions

Starting Rsync daemon on Sailfish

• Make sure Android subsystem is stopped
• Make sure you PC is in connected to the same WiFi network as your phone
• Figure out your phone's IP address. It's shown in "Developer mode". We will use it later
• Enable developer mode
• Open terminal app or connect via SSH
• Become root by executing devel-su
• Create minimalistic Rsync config

cat > /root/rsyncd-alien.conf << 'EOF'
[alien]
 path=/opt/alien
 readonly=false
 uid=root
 gid=root 
EOF

• run daemon in foreground with logging

rsync --daemon --no-detach --verbose --config=/root/rsyncd-alien.conf --log-file=/dev/stdout

Execute docker image

Make sure docker is available on you machine and running

• https://www.docker.com/docker-windows
• https://www.docker.com/docker-mac

docker run --rm -ti --env SAILFISH=<PHONE_IP_ADDRESS> vermut/sailfish-signature-spoofing

Final steps

• kill running rsync by pressing Ctrl-C
• start Android subsystem (or just run some app). This will take time, depending on number of apps you have
• From that point you can install microG (nightly) F-Droid. Don't forget to enable "Unstable updates" from "Expert mode"

Reverting the changes (if needed)

cd /opt/alien/system
cp -r --reply=yes -v framework.pre_haystack/* framework/
cp -r --reply=yes -v app.pre_haystack/* app/
cp -r --reply=yes -v priv-app.pre_haystack/* priv-app/

cd /opt/alien/system_jolla
cp -r --reply=yes -v framework.pre_haystack/* framework/
cp -r --reply=yes -v app.pre_haystack/* app/
cp -r --reply=yes -v priv-app.pre_haystack/* priv-app/