Assign CA Cert to Android's /system directory for HTTPs decryption

Based on my device lab where tested on Android Virtual Device API v16 – v29, use GAPPs or not.

The main goal is to quickly give a affirmative detail to BE team, when any error occurred.

Fast way for bug spot inspections at production app. Occurred at BE side?, network call, FE logic, or else.

	#Installing CA Cert to android system
	1. get cert file
	cd ~/.mitmproxy
	2. get cert hash
	// convert cer to pem
	openssl x509 -inform der -in certificate.cer -out certificate.pem
	// cert hash for android
	openssl x509 -inform PEM -subject_hash_old -in mitmproxy-ca.pem | head -1
	3. rename cert to hash with *.0 extension
	nm=c8750f0d.0
	cp mitmproxy-ca.pem $nm
	4. start AVD in writable-system mode
	emulator -list-avds
	emulator @Nexus_5X_API_29_x86 -writable-system
	adb root
	adb shell "mount -o remount,rw /"
	5. push cert file
	adb push $nm /system/etc/security/cacerts
	6. change file permission
	adb shell chmod 664 /system/etc/security/cacerts/$nm
	7. reboot android system
	adb reboot
	8. chenk availability after reboot
	adb shell ls /system/etc/security/cacerts/$nm

view raw push_android_cert_to_system_dir.txt hosted with ❤ by GitHub

https://gist.github.com/esabook/1b5e8ae79f07fe4713042dd698c38ea2

Device Android version 9

Download app from Google Play

Test Cert with proxy: connect

Test Cert with proxy: decrypt