Setup mitmproxy certificate on a new android emulator

setup_mitm_emulator.sh

# Following instructions in https://docs.mitmproxy.org/stable/howto-install-system-trusted-ca-android/#instructions-for-api-level--28-1
# Use and emulator with API level 28 or lower

# Start the emulator with: emulator -avd <avd name> -writable-system


set -x
set -e

root_result=$(adb root)
if [[ $root_result == "restarting adbd"* ]]; then
    adb wait-for-device
fi


adb remount

# copy the certificate to the emulator
cd ~/.mitmproxy/
hashed_name=`openssl x509 -inform PEM -subject_hash_old -in mitmproxy-ca-cert.cer | head -1`
android_cert_name="$hashed_name.0"

cp mitmproxy-ca-cert.cer $android_cert_name

adb push $android_cert_name /system/etc/security/cacerts/
adb shell chmod 644 /system/etc/security/cacerts/$android_cert_name

echo "Enjoy! You may need to reboot the emulator."