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Support for removing SUID bits

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madaidan 2019-12-19 17:01:08 +00:00 committed by GitHub
parent 62eb462920
commit 3c2ca0257f
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1 changed files with 44 additions and 8 deletions
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52
usr/lib/security-misc/permission-hardening
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@ -1,11 +1,47 @@
#!/bin/bash #!/bin/bash
## Copyright (C) 2012 - 2019 ENCRYPTED SUPPORT LP <adrelanos@riseup.net>
## See the file COPYING for copying conditions.
set -x
config_file="/etc/permission-hardening.conf" config_file="/etc/permission-hardening.conf"
shopt -s globstar
add_statoverride_entry() {
if [ "${nosuid}" = "true" ]; then
while read -r line; do
if ! read -r file_name existing_mode owner group; then
continue
fi
if test -u "${file_name}" || test -g "${file_name}"; then
echo "suid - file_name: '${file_name}' | existing_mode: '${existing_mode}'"
if dpkg-statoverride --list | grep -q "${file_name}"; then
if ! dpkg-statoverride --list | grep -q "${owner} ${group} ${existing_mode:1} ${file_name}"; then
dpkg-statoverride --remove "${file_name}"
dpkg-statoverride --add --update "${owner}" "${group}" "${existing_mode:1}" "${file_name}"
fi
else
dpkg-statoverride --add --update "${owner}" "${group}" "${existing_mode:1}" "${file_name}"
fi
fi
done < <( stat -c "%n %a %U %G" ${file%/}/** )
else
dpkg-statoverride --add --update "${owner}" "${group}" "${mode}" "${file%/}"
fi
}
set_file_perms() { set_file_perms() {
while read -r line; do while read -r line; do
[[ "$line" =~ ^#.*$ ]] && continue [[ "$line" =~ ^#.*$ ]] && continue
if [ "${line}" = "" ]; then
continue
fi
if ! read -r file mode owner group capability <<< "${line}" ; then if ! read -r file mode owner group capability <<< "${line}" ; then
echo "ERROR: cannot parse line: ${line}" echo "ERROR: cannot parse line: ${line}"
continue continue
@ -16,34 +52,34 @@ set_file_perms() {
continue continue
fi fi
if ! seq -w 000 4777 | grep -qw "${mode}"; then nosuid=""
if [ "${mode}" = "nosuid" ]; then
nosuid="true"
elif ! seq -w 000 4777 | grep -qw "${mode}"; then
echo "ERROR: Mode '${mode}' is invalid!" echo "ERROR: Mode '${mode}' is invalid!"
continue continue
fi fi
if ! getent passwd | grep -q "^${owner}:"; then if ! getent passwd | grep -q "^${owner}:" && ! [ "${mode}" = "nosuid" ]; then
echo "ERROR: User '${owner}' does not exist!" echo "ERROR: User '${owner}' does not exist!"
continue continue
fi fi
if ! getent group | grep -q "^${group}:"; then if ! getent group | grep -q "^${group}:" && ! [ "${mode}" = "nosuid" ]; then
echo "ERROR: Group '${group}' does not exist!" echo "ERROR: Group '${group}' does not exist!"
continue continue
fi fi
chmod "${mode}" "${file}"
chown "${owner}:${group}" "${file}"
## The permissions should not be reset during upgrades. ## The permissions should not be reset during upgrades.
if dpkg-statoverride --list | grep -q "${file%/}"; then if dpkg-statoverride --list | grep -q "${file%/}"; then
## If there is an entry for the file, but the owner/group/mode do not ## If there is an entry for the file, but the owner/group/mode do not
## match, we remove and re-add the entry to update it. ## match, we remove and re-add the entry to update it.
if ! dpkg-statoverride --list | grep -q "${owner} ${group} ${mode:1} ${file%/}"; then if ! dpkg-statoverride --list | grep -q "${owner} ${group} ${mode:1} ${file%/}"; then
dpkg-statoverride --remove "${file}" dpkg-statoverride --remove "${file}"
dpkg-statoverride --add "${owner}" "${group}" "${mode}" "${file}" add_statoverride_entry
fi fi
else else
dpkg-statoverride --add "${owner}" "${group}" "${mode}" "${file}" add_statoverride_entry
fi fi
if ! [ "${capability}" = "" ]; then if ! [ "${capability}" = "" ]; then