关于Redhat-9.x-Linux-安全加固-Disable USB Storage

本文的操作系统版本： Red Hat Enterprise Linux release 9.0 (Plow)

可以通过如下的脚本，进行验证-确认 usb-storage 是否开启了

#!/usr/bin/env bash

{
l_output="" l_output2=""
l_mname="usb-storage" # set module name
# Check if the module exists on the system
if [ -z "$(modprobe -n -v "$l_mname" 2>&1 | grep -Pi -- "\h*modprobe:\h+FATAL:\h+Module\h+$l_mname\h+not\h+found\h+in\h+directory")" ]; then
# Check how module will be loaded
l_loadable="$(modprobe -n -v "$l_mname")"
[ "$(wc -l <<< "$l_loadable")" -gt "1" ] && l_loadable="$(grep -P -- "(^\h*install|\b$l_mname)\b" <<< "$l_loadable")"
if grep -Pq -- '^\h*install \/bin\/(true|false)' <<< "$l_loadable"; then
l_output="$l_output\n - module: \"$l_mname\" is not loadable: \"$l_loadable\""
else
l_output2="$l_output2\n - module: \"$l_mname\" is loadable: \"$l_loadable\""
fi
# Check is the module currently loaded
if ! lsmod | grep "$l_mname" > /dev/null 2>&1; then
l_output="$l_output\n - module: \"$l_mname\" is not loaded"
else
l_output2="$l_output2\n - module: \"$l_mname\" is loaded"
fi
# Check if the module is deny listed
if modprobe --showconfig | grep -Pq -- "^\h*blacklist\h+$(tr '-' '_' <<< "$l_mname")\b"; then
l_output="$l_output\n - module: \"$l_mname\" is deny listed in: \"$(grep -Pl -- "^\h*blacklist\h+$l_mname\b" /etc/modprobe.d/*)\""
else
l_output2="$l_output2\n - module: \"$l_mname\" is not deny listed"
fi
else
l_output="$l_output\n - Module \"$l_mname\" doesn't exist on the system"
fi
# Report results. If no failures output in l_output2, we pass
if [ -z "$l_output2" ]; then
echo -e "\n- Audit Result:\n ** PASS **\n$l_output\n"
else
echo -e "\n- Audit Result:\n ** FAIL **\n - Reason(s) for audit failure:\n$l_output2\n"
[ -n "$l_output" ] && echo -e "\n- Correctly set:\n$l_output\n"
fi
}

如下，先看看加固前的运行结果：

 然后，我们进行整改-加固，也是使用一个脚本，快速加固，脚本如下：

#!/usr/bin/env bash

{
l_mname="usb-storage" # set module name
# Check if the module exists on the system
if [ -z "$(modprobe -n -v "$l_mname" 2>&1 | grep -Pi -- "\h*modprobe:\h+FATAL:\h+Module\h+$l_mname\h+not\h+found\h+in\h+directory")" ]; then
# Remediate loadable
l_loadable="$(modprobe -n -v "$l_mname")"
[ "$(wc -l <<< "$l_loadable")" -gt "1" ] && l_loadable="$(grep -P -- "(^\h*install|\b$l_mname)\b" <<< "$l_loadable")"
if ! grep -Pq -- '^\h*install \/bin\/(true|false)' <<< "$l_loadable"; then
echo -e " - setting module: \"$l_mname\" to be not loadable"
echo -e "install $l_mname /bin/false" >> /etc/modprobe.d/"$l_mname".conf
fi

# Remediate loaded
if lsmod | grep "$l_mname" > /dev/null 2>&1; then
echo -e " - unloading module \"$l_mname\""
modprobe -r "$l_mname"
fi

# Remediate deny list
if ! modprobe --showconfig | grep -Pq -- "^\h*blacklist\h+$(tr '-' '_' <<< "$l_mname")\b"; then
echo -e " - deny listing \"$l_mname\""
echo -e "blacklist $l_mname" >> /etc/modprobe.d/"$l_mname".conf
fi

else
echo -e " - Nothing to remediate\n - Module \"$l_mname\" doesn't exist on the system"
fi
}

执行后，我们再次验证，就可以看到通过了，也即 usb-storage is disabled 

 

 

 

 

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