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fix: kernel module detection (#129)

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* fix: add filter to hfs

* fix is_kernel_option_enabled check

as the module in question could have dependencies which have been blacklisted as well we need to make sure that the comparison only checks for the module in question - the last line in the output.

Co-authored-by: GoldenKiwi <thibault.dewailly@corp.ovh.com>
This commit is contained in:
Jan Schmidle 2021-10-20 14:51:29 +02:00 committed by GitHub
parent ad192c9457
commit 8f855ac159
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GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 6 additions and 6 deletions
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4
bin/hardening/1.1.1.3_disable_hfs.sh
View File

@ -26,7 +26,7 @@ audit() {
# In an unprivileged container, the kernel modules are host dependent, so you should consider enforcing it
ok "Container detected, consider host enforcing or disable this check!"
else
is_kernel_option_enabled "$KERNEL_OPTION" "$MODULE_NAME"
is_kernel_option_enabled "$KERNEL_OPTION" "$MODULE_NAME" "($MODULE_NAME|install)"
if [ "$FNRET" = 0 ]; then # 0 means true in bash, so it IS activated
crit "$MODULE_NAME is enabled!"
else
@ -41,7 +41,7 @@ apply() {
# In an unprivileged container, the kernel modules are host dependent, so you should consider enforcing it
ok "Container detected, consider host enforcing!"
else
is_kernel_option_enabled "$KERNEL_OPTION" "$MODULE_NAME"
is_kernel_option_enabled "$KERNEL_OPTION" "$MODULE_NAME" "($MODULE_NAME|install)"
if [ "$FNRET" = 0 ]; then # 0 means true in bash, so it IS activated
warn "I cannot fix $MODULE_NAME, recompile your kernel or blacklist module $MODULE_NAME (/etc/modprobe.d/blacklist.conf : +install $MODULE_NAME /bin/true)"
else

4
bin/hardening/1.1.1.4_disable_hfsplus.sh
View File

@ -26,7 +26,7 @@ audit() {
# In an unprivileged container, the kernel modules are host dependent, so you should consider enforcing it
ok "Container detected, consider host enforcing or disable this check!"
else
is_kernel_option_enabled "$KERNEL_OPTION" "$MODULE_NAME"
is_kernel_option_enabled "$KERNEL_OPTION" "$MODULE_NAME" "($MODULE_NAME|install)"
if [ "$FNRET" = 0 ]; then # 0 means true in bash, so it IS activated
crit "$MODULE_NAME is enabled!"
else
@ -41,7 +41,7 @@ apply() {
# In an unprivileged container, the kernel modules are host dependent, so you should consider enforcing it
ok "Container detected, consider host enforcing!"
else
is_kernel_option_enabled "$KERNEL_OPTION" "$MODULE_NAME"
is_kernel_option_enabled "$KERNEL_OPTION" "$MODULE_NAME" "($MODULE_NAME|install)"
if [ "$FNRET" = 0 ]; then # 0 means true in bash, so it IS activated
warn "I cannot fix $MODULE_NAME, recompile your kernel or blacklist module $MODULE_NAME (/etc/modprobe.d/blacklist.conf : +install $MODULE_NAME /bin/true)"
else

4
lib/utils.sh
View File

@ -384,9 +384,9 @@ is_kernel_option_enabled() {
fi
else
if [ "$MODPROBE_FILTER" != "" ]; then
DEF_MODULE="$($SUDO_CMD modprobe -n -v "$MODULE_NAME" 2>/dev/null | grep -E "$MODPROBE_FILTER" | xargs)"
DEF_MODULE="$($SUDO_CMD modprobe -n -v "$MODULE_NAME" 2>/dev/null | grep -E "$MODPROBE_FILTER" | tail -1 | xargs)"
else
DEF_MODULE="$($SUDO_CMD modprobe -n -v "$MODULE_NAME" 2>/dev/null | xargs)"
DEF_MODULE="$($SUDO_CMD modprobe -n -v "$MODULE_NAME" 2>/dev/null | tail -1 | xargs)"
fi
if [ "$DEF_MODULE" == "install /bin/true" ] || [ "$DEF_MODULE" == "install /bin/false" ]; then