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https://github.com/Kicksecure/security-misc.git
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79 lines
2.1 KiB
Bash
Executable File
79 lines
2.1 KiB
Bash
Executable File
#!/bin/bash
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## Copyright (C) 2012 - 2019 ENCRYPTED SUPPORT LP <adrelanos@riseup.net>
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## See the file COPYING for copying conditions.
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set -e
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sysfs_whitelist=1
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cpuinfo_whitelist=1
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shopt -s nullglob
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## Allows for disabling the whitelist.
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for i in /etc/hide-hardware-info.d/*.conf
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do
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bash -n "${i}"
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source "${i}"
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done
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create_whitelist() {
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if [ "${1}" = "sysfs" ]; then
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whitelist_path="/sys"
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elif [ "${1}" = "cpuinfo" ]; then
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whitelist_path="/proc/cpuinfo"
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else
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echo "ERROR: ${1} is not a correct parameter."
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exit 1
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fi
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if grep -q "${1}" /etc/group; then
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## Changing the permissions of /sys recursively
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## causes errors as the permissions of /sys/kernel/debug
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## and /sys/fs/cgroup cannot be changed.
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chgrp -fR "${1}" "${whitelist_path}" || true
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chmod o-rwx "${whitelist_path}"
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else
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echo "ERROR: The ${1} group does not exist, the ${1} whitelist was not created."
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fi
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}
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## sysfs and debugfs expose a lot of information
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## that should not be accessible by an unprivileged
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## user which includes hardware info, debug info and
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## more. This restricts /sys, /proc/cpuinfo, /proc/bus
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## and /proc/scsi to the root user only. This hides
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## many hardware identifiers from ordinary users
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## and increases security.
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for i in /proc/cpuinfo /proc/bus /proc/scsi /sys
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do
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if [ -e "${i}" ]; then
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if [ "${i}" = "/sys" ]; then
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## Whitelist for /sys.
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if [ "${sysfs_whitelist}" = "1" ]; then
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create_whitelist sysfs
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else
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chmod og-rwx /sys
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echo "INFO: The sysfs whitelist is not enabled. Some things may not work properly."
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fi
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elif [ "${i}" = "/proc/cpuinfo" ]; then
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## Whitelist for /proc/cpuinfo.
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if [ "${cpuinfo_whitelist}" = "1" ]; then
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create_whitelist cpuinfo
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else
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chmod og-rwx /proc/cpuinfo
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echo "INFO: The cpuinfo whitelist is not enabled. Some things may not work properly."
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fi
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else
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chmod og-rwx "${i}"
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fi
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else
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## /proc/scsi doesn't exist on Debian so errors
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## are expected here.
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if ! [ "${i}" = "/proc/scsi" ]; then
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echo "ERROR: ${i} could not be found."
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fi
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fi
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done
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