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Merge remote-tracking branch 'friedy10/master'

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Patrick Schleizer 2023-01-07 12:38:14 -05:00
commit 450ff378b0
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9 changed files with 200 additions and 17 deletions
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3
etc/sysctl.d/30_security-misc.conf
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@ -37,7 +37,8 @@ net.core.bpf_jit_harden=2
## A toggle indicating if the kexec_load syscall has been disabled. This value defaults to 0 (false: kexec_load enabled), but can be set to 1 (true: kexec_load disabled). Once true, kexec can no longer be used, and the toggle cannot be set back to false. This allows a kexec image to be loaded before disabling the syscall, allowing a system to set up (and later use) an image without it being altered. Generally used together with the "modules_disabled" sysctl.
## Disables kexec which can be used to replace the running kernel.
kernel.kexec_load_disabled=1
## kexec is required for cold boot attack defense
## kernel.kexec_load_disabled=1
## Hides kernel addresses in various files in /proc.
## Kernel addresses can be very useful in certain exploits.

15
lib/systemd/system/cold-boot-attack-defense-kexec-prepare.service Normal file
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@ -0,0 +1,15 @@
## Copyright (C) 2023 - 2023 ENCRYPTED SUPPORT LP <adrelanos@whonix.org>
## Copyright (C) 2023 - 2023 Friedrich Doku <friedrichdoku@gmail.com>
## See the file COPYING for copying conditions.
[Unit]
Description=https://www.kicksecure.com/wiki/Cold_Boot_Attack_Defense
[Service]
Type=oneshot
RemainAfterExit=yes
ExecStart=/bin/true
ExecStop=/usr/libexec/security-misc/cold-boot-attack-defense-kexec-prepare
[Install]
WantedBy=multi-user.target

49
usr/lib/dracut/modules.d/10ram-wipe-exit/module-setup.sh Normal file
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@ -0,0 +1,49 @@
#!/bin/bash
# -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
# ex: ts=8 sw=4 sts=4 et filetype=sh
## Copyright (C) 2023 - 2023 ENCRYPTED SUPPORT LP <adrelanos@whonix.org>
## Copyright (C) 2023 - 2023 Friedrich Doku <friedrichdoku@gmail.com>
## See the file COPYING for copying conditions.
# called by dracut
check() {
require_binaries sync || return 1
require_binaries sleep || return 1
require_binaries ls || return 1
require_binaries halt || return 1
require_binaries poweroff || return 1
require_binaries reboot || return 1
require_binaries cat || return 1
require_binaries sdmem || return 1
require_binaries pgrep || return 1
require_binaries dmsetup || return 1
return 0
}
# called by dracut
depends() {
return 0
}
# called by dracut
install() {
inst_multiple sync
inst_multiple sleep
inst_multiple ls
inst_multiple halt
inst_multiple poweroff
inst_multiple reboot
inst_multiple cat
inst_multiple sdmem
inst_multiple pgrep
inst_multiple dmsetup
inst_hook pre-udev 40 "$moddir/wipe-ram.sh"
inst_hook pre-trigger 40 "$moddir/wipe-ram-needshutdown.sh"
}
# called by dracut
installkernel() {
return 0
}

35
usr/lib/dracut/modules.d/10ram-wipe-exit/wipe-ram-needshutdown.sh Normal file
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@ -0,0 +1,35 @@
#!/bin/sh
## Copyright (C) 2023 - 2023 ENCRYPTED SUPPORT LP <adrelanos@whonix.org>
## Copyright (C) 2023 - 2023 Friedrich Doku <friedrichdoku@gmail.com>
## See the file COPYING for copying conditions.
ram_wipe_check_needshutdown() {
local wipe_action
wipe_action=$(getarg wiperamaction)
wait $(pgrep sdmem)
info "DONE WAITING..."
if [ "$wipe_action" = "reboot" ]; then
reboot -f
fi
if [ "$wipe_action" = "poweroff" ]; then
poweroff -f
fi
if [ "$wipe_action" = "halt" ]; then
halt -f
fi
if [ "$wipe_action" = "error" ]; then
info "Choice of shutdown option led to an error. Shutting down..."
sleep 5
poweroff -f
fi
}
ram_wipe_check_needshutdown

28
usr/lib/dracut/modules.d/10ram-wipe-exit/wipe-ram.sh Normal file
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@ -0,0 +1,28 @@
#!/bin/sh
## Copyright (C) 2023 - 2023 ENCRYPTED SUPPORT LP <adrelanos@whonix.org>
## Copyright (C) 2023 - 2023 Friedrich Doku <friedrichdoku@gmail.com>
## See the file COPYING for copying conditions.
ram_wipe_action() {
local kernel_wiperam_exit
kernel_wiperam_exit=$(getarg wiperamexit)
if [ "$kernel_wiperam_exit" = "no" ]; then
info "INFO: Skip, because wiperamexit=no kernel parameter detected, OK."
return 0
fi
if [ "$kernel_wiperam_exit" != "yes" ]; then
info "INFO: Skip, becuase wiperamexit parameter is not used. "
return 0
fi
info "INFO: wiperamexit=yes. Running second RAM wipe... "
sdmem -l -l -v
}
ram_wipe_action

7
usr/lib/dracut/modules.d/40cold-boot-attack-defense/module-setup.sh
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@ -2,13 +2,10 @@
# -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
# ex: ts=8 sw=4 sts=4 et filetype=sh
## Copyright (C) 2022 - 2022 ENCRYPTED SUPPORT LP <adrelanos@whonix.org>
## Copyright (C) 2023 - 2023 ENCRYPTED SUPPORT LP <adrelanos@whonix.org>
## Copyright (C) 2023 - 2023 Friedrich Doku <friedrichdoku@gmail.com>
## See the file COPYING for copying conditions.
## Credits:
## First version by @friedy10.
## https://github.com/friedy10/dracut/blob/master/modules.d/40sdmem/module-setup.sh
# called by dracut
check() {
require_binaries sync || return 1

3
usr/lib/dracut/modules.d/40cold-boot-attack-defense/wipe-ram-needshutdown.sh
View File

@ -1,6 +1,7 @@
#!/bin/sh
## Copyright (C) 2022 - 2022 ENCRYPTED SUPPORT LP <adrelanos@whonix.org>
## Copyright (C) 2023 - 2023 ENCRYPTED SUPPORT LP <adrelanos@whonix.org>
## Copyright (C) 2023 - 2023 Friedrich Doku <friedrichdoku@gmail.com>
## See the file COPYING for copying conditions.
type getarg >/dev/null 2>&1 || . /lib/dracut-lib.sh

22
usr/lib/dracut/modules.d/40cold-boot-attack-defense/wipe-ram.sh
View File

@ -1,6 +1,7 @@
#!/bin/sh
## Copyright (C) 2022 - 2022 ENCRYPTED SUPPORT LP <adrelanos@whonix.org>
## Copyright (C) 2023 - 2023 ENCRYPTED SUPPORT LP <adrelanos@whonix.org>
## Copyright (C) 2023 - 2023 Friedrich Doku <friedrichdoku@gmail.com>
## See the file COPYING for copying conditions.
## Credits:
@ -22,20 +23,20 @@ ram_wipe() {
kernel_wiperam_setting=$(getarg wiperam)
if [ "$kernel_wiperam_setting" = "skip" ]; then
echo "INFO: wipe-ram.sh: Skip, because wiperam=skip kernel parameter detected, OK." > /dev/kmsg
info "INFO: wipe-ram.sh: Skip, because wiperam=skip kernel parameter detected, OK."
return 0
fi
if [ "$kernel_wiperam_setting" = "force" ]; then
echo "INFO: wipe-ram.sh: wiperam=force detected, OK." > /dev/kmsg
info "INFO: wipe-ram.sh: wiperam=force detected, OK."
else
if systemd-detect-virt &>/dev/null ; then
echo "INFO: wipe-ram.sh: Skip, because VM detected and not using wiperam=force kernel parameter, OK." > /dev/kmsg
info "INFO: wipe-ram.sh: Skip, because VM detected and not using wiperam=force kernel parameter, OK."
return 0
fi
fi
echo "INFO: wipe-ram.sh: Cold boot attack defense... Starting RAM wipe on shutdown..." > /dev/kmsg
info "INFO: wipe-ram.sh: Cold boot attack defense... Starting RAM wipe on shutdown..."
drop_caches
@ -45,33 +46,34 @@ ram_wipe() {
drop_caches
echo "INFO: wipe-ram.sh: RAM wipe completed, OK." > /dev/kmsg
info "INFO: wipe-ram.sh: RAM wipe completed, OK."
## In theory might be better to check this beforehand, but the test is
## really fast. The user has no chance of reading the console output
## without introducing an artificial delay because the sdmem which runs
## after this, results in much more console output.
echo "INFO: wipe-ram.sh: Checking if there are still mounted encrypted disks..." > /dev/kmsg
info "INFO: wipe-ram.sh: Checking if there are still mounted encrypted disks..."
local dmsetup_actual_output dmsetup_expected_output
dmsetup_actual_output="$(dmsetup ls --target crypt)"
dmsetup_expected_output="No devices found"
if [ "$dmsetup_actual_output" = "$dmsetup_expected_output" ]; then
echo "INFO: wipe-ram.sh: Success, there are no more mounted encrypted disks, OK." > /dev/kmsg
info "INFO: wipe-ram.sh: Success, there are no more mounted encrypted disks, OK."
## This should probably be removed in production?
sleep 3
else
echo "\
info "\
WARNING: wipe-ram.sh:There are still mounted encrypted disks! RAM wipe failed!
debugging information:
dmsetup_expected_output: '$dmsetup_expected_output'
dmsetup_actual_output: '$dmsetup_actual_output'" > /dev/kmsg
dmsetup_actual_output: '$dmsetup_actual_output'"
## How else could the user be informed that something is wrong?
sleep 5
fi
kexec -e && info "kexec -e succeeded" || info "kexec -e failed"
}
ram_wipe

55
usr/libexec/security-misc/cold-boot-attack-defense-kexec-prepare Executable file
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@ -0,0 +1,55 @@
#!/bin/bash
## Copyright (C) 2023 - 2023 ENCRYPTED SUPPORT LP <adrelanos@whonix.org>
## Copyright (C) 2023 - 2023 Friedrich Doku <friedrichdoku@gmail.com>
## See the file COPYING for copying conditions.
set -x
set -e
true "env:"
env
## Debugging.
## Lets hope $1 is set to reboot, poweroff or halt by systemd.
true "1: $1"
# Get the kernel command-line arguments
cmdline=$(cat /proc/cmdline)
# Get the current boot image
kernel=$(echo "$cmdline" | grep -o 'BOOT_IMAGE=\S*' | cut -d '=' -f 2)
initrd=$(echo "$kernel" | sed "s#vmlinuz#initrd.img#")
kernel="/boot/$kernel"
initrd="/boot/$initrd"
if test -e $initrd; then
echo "Initrd File Found"
else
echo "Initrd File NOT FOUND"
exit 1
fi
if test -e $kernel; then
echo "Kernel File Found"
else
echo "Kernel File NOT FOUND"
exit 1
fi
if systemctl list-jobs | grep "poweroff.target" | grep -q "start"; then
wram="yes"
wact="poweroff"
elif systemctl list-jobs | grep "reboot.target" | grep -q "start"; then
wram="yes"
wact="reboot"
elif systemctl list-jobs | grep "halt.target" | grep -q "start"; then
wram="yes"
wact="halt"
else
echo "No shutdown option found!"
exit 0
fi
kexec -l $kernel --initrd=$initrd --reuse-cmdline --append="wiperamexit=$wram wiperamaction=$wact"