Firefox provides development tools which identify detailed information
about the browser and its configuration. These details are often also
recorded into a log file, giving an attacker the ability to capture
detailed information about the system.
This can be disabled by setting DisableDeveloperTools to
true in policies.json
Rationale
In order to protect privacy and sensitive data, Mozilla provides
the ability to configure Firefox so that development tools are prevented from being used.
firefox_cfg="policies.json"
# Default to /etc/firefox/policies to use for remediations.
firefox_dirs="/etc/firefox/policies"
permissions=644
declare __REMEDIATE_PYTHON
if [ -x /usr/bin/python ]; then
__REMEDIATE_PYTHON=/usr/bin/python
elif [ -x /usr/bin/python3 ]; then
__REMEDIATE_PYTHON=/usr/bin/python3
elif [ -x /usr/bin/python2 ]; then
__REMEDIATE_PYTHON=/usr/bin/python2
else
echo "Python required and no python interpreter found."
exit 1
fi
declare __FIREFOX_DISTRIBUTION
if find /usr -iname firefox\* -type f -print | grep -qe "firefox.sh$\|firefox-bin$"; then
__FIREFOX_DISTRIBUTION=$(dirname "$(find /usr -iname firefox\* -type f -print | grep -e "firefox.sh$\|firefox-bin$" | head -n1)")/distribution
fi
# If there's a policies file in the distribution directory already, modify it.
if [ -f ${__FIREFOX_DISTRIBUTION}/policies.json ]; then
firefox_dirs="${__FIREFOX_DISTRIBUTION}"
fi
# Check the possible Firefox install directories
for firefox_dir in ${firefox_dirs}; do
if ! [ -d "${firefox_dir}" ]; then
mkdir -p "${firefox_dir}"
chmod 755 "${firefox_dir}"
fi
# Make sure the Firefox .cfg file exists and has the appropriate permissions
if ! [ -f "${firefox_dir}/${firefox_cfg}" ] ; then
echo "{" > "${firefox_dir}/${firefox_cfg}"
echo " \"policies\": {" >> "${firefox_dir}/${firefox_cfg}"
echo " }" >> "${firefox_dir}/${firefox_cfg}"
echo "}" >> "${firefox_dir}/${firefox_cfg}"
chmod ${permissions} "${firefox_dir}/${firefox_cfg}"
fi
# If the key exists, change it. Otherwise, add it to the config_file.
if [ -x ${__REMEDIATE_PYTHON} ]; then
echo """
import json
_file=open('${firefox_dir}/${firefox_cfg}', 'r')
_tree=json.load(_file)
_file.close()
_tree['policies']['DisableDeveloperTools'] = True
_file=open('${firefox_dir}/${firefox_cfg}', 'w')
json.dump(_tree, _file, indent=4, sort_keys=True)
_file.close()
""" | ${__REMEDIATE_PYTHON}
chmod ${permissions} "${firefox_dir}/${firefox_cfg}"
fi
done