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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 # 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!" ok "Container detected, consider host enforcing or disable this check!"
else 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 if [ "$FNRET" = 0 ]; then # 0 means true in bash, so it IS activated
crit "$MODULE_NAME is enabled!" crit "$MODULE_NAME is enabled!"
else else
@ -41,7 +41,7 @@ apply() {
# In an unprivileged container, the kernel modules are host dependent, so you should consider enforcing it # In an unprivileged container, the kernel modules are host dependent, so you should consider enforcing it
ok "Container detected, consider host enforcing!" ok "Container detected, consider host enforcing!"
else else
is_kernel_option_enabled "$KERNEL_OPTION" "$MODULE_NAME" is_kernel_option_enabled "$KERNEL_OPTION" "$MODULE_NAME" "($MODULE_NAME|install)"
if [ "$FNRET" = 0 ]; then # 0 means true in bash, so it IS activated if [ "$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)" 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 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 # 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!" ok "Container detected, consider host enforcing or disable this check!"
else 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 if [ "$FNRET" = 0 ]; then # 0 means true in bash, so it IS activated
crit "$MODULE_NAME is enabled!" crit "$MODULE_NAME is enabled!"
else else
@ -41,7 +41,7 @@ apply() {
# In an unprivileged container, the kernel modules are host dependent, so you should consider enforcing it # In an unprivileged container, the kernel modules are host dependent, so you should consider enforcing it
ok "Container detected, consider host enforcing!" ok "Container detected, consider host enforcing!"
else else
is_kernel_option_enabled "$KERNEL_OPTION" "$MODULE_NAME" is_kernel_option_enabled "$KERNEL_OPTION" "$MODULE_NAME" "($MODULE_NAME|install)"
if [ "$FNRET" = 0 ]; then # 0 means true in bash, so it IS activated if [ "$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)" 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 else

4
lib/utils.sh
View File

@ -384,9 +384,9 @@ is_kernel_option_enabled() {
fi fi
else else
if [ "$MODPROBE_FILTER" != "" ]; then if [ "$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 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 fi
if [ "$DEF_MODULE" == "install /bin/true" ] || [ "$DEF_MODULE" == "install /bin/false" ]; then if [ "$DEF_MODULE" == "install /bin/true" ] || [ "$DEF_MODULE" == "install /bin/false" ]; then