Disable all Trusted CA CERTs on Android 4.x and later (requires root)

trustnocerts.sh

#!/system/bin/sh
#
# disables all trusted root certs on your Android 4.x
# by jduck of #droidsec
#
# requires a working openssl binary in /data/local/tmp
# (you can build one from AOSP "make openssl")
#
# run this as system!! for example:
# shell@flo:/data/local/tmp $ su system -c ./trustnocerts.sh
# shell@flo:/data/local/tmp $
#
# if you want to re-enable a key, either do it manually or rm the file created in 
# /data/misc/keychain/cacerts-removed
#
# for example, to re-enable some geotrust and verisign certs:
# system@flo:/data/local/tmp $ ./busybox grep -Ei 'O=(geotrust|verisign)' /etc/security/cacerts/* | ./busybox awk -F: '{print $1}' | ./busybox sort -u | ./busybox awk -F/ '{print "rm /data/misc/keychain/cacerts-removed/"$5}' | sh
# system@flo:/data/local/tmp $
#
# enjoy!
#

umask 022

if ! mkdir -p /data/misc/keychain/cacerts-removed; then
  echo "failed to create /data/misc/keychain/cacerts-removed! are you system??"
  exit 1
fi

cd /etc/security/cacerts

for ii in *; do
  /data/local/tmp/openssl x509 -in $ii -outform der -out /data/misc/keychain/cacerts-removed/$ii
done

Cool. Nice little code bit