3
0
forked from pool/libselinux
libselinux/selinux-ready
2023-10-04 11:55:58 +00:00

246 lines
5.7 KiB
Bash

#!/bin/bash
KERNEL="unknown"
INITRD="unknown"
TD=""
# init needs /selinux to be there
check_dir()
{
SLDIRS="/selinux /sys/fs/selinux"
FOUND="no"
for DIR in $SLDIRS; do
if [ -d $DIR ]; then
printf "\tcheck_dir: OK. $DIR exists.\n"
FOUND="yes"
fi
done
if [ $FOUND == "yes" ]; then
return 0
else
printf "\tcheck_dir: ERR. Neither of $SLDIRS does exist. Please execute 'mkdir /sys/fs/selinux' as root\n"
return 1
fi
}
check_filesystem()
{
FSPATH="/proc/filesystems"
FSNAMES="securityfs selinuxfs"
OK="O"
for FSNAME in $FSNAMES; do
grep -w $FSNAME $FSPATH 1>&2 >/dev/null
if [ $? == 0 ]; then
printf "\tcheck_filesystem: OK. Filesystem '$FSNAME' exists.\n"
else
printf "\tcheck_filesystem: ERR. Filesystem '$FSNAME' is missing. Please enable SELinux while compiling the kernel.\n"
OK="1"
fi
done
if [ "$OK" == "0" ]; then
return 0;
else
return 1;
fi
}
check_boot()
{
printf "\tcheck_boot: Assuming GRUB2 as bootloader.\n"
BPARAM1="security=selinux"
BPARAM2="selinux=1"
if grep $BPARAM1 /proc/cmdline | grep $BPARAM2 >/dev/null; then
printf "\tcheck_boot: OK. Current kernel has boot-parameters '$BPARAM1 $BPARAM2'\n"
return 0
else
printf "\tcheck_boot: ERR. Boot-parameter missing for booting the kernel.\n"
printf "\t Please add 'security=selinux selinux=1' to the kernel boot-parameter list.\n"
return 1
fi
}
check_mkinitrd()
{
MCMD="mount.*/root/proc.*"
if ! [ -f "/boot/initrd" ];then
printf "\tcheck_mkinitrd: ERR. Unable to locate '/boot/initrd'\n"
return 2
fi
cp /boot/initrd $TD/ 2>/dev/null
pushd . 2>&1>/dev/null
cd $TD
mkdir initrd-extracted
cd initrd-extracted
INITRD_FORMAT=$(file $TD/initrd | awk -F' ' '{print $2}')
case $INITRD_FORMAT in
'XZ' )
xz -d -c $TD/initrd | cpio -i --force-local --no-absolute-filenames 2>/dev/null ;;
'ASCII' )
/usr/lib/dracut/skipcpio $TD/initrd | zstd -d | cpio -i --force-local --no-absolute-filenames 2>/dev/null ;;
'gzip' )
gzip -d -c $TD/initrd | cpio -i --force-local --no-absolute-filenames 2>/dev/null ;;
'Zstandard' )
zstd -d -c $TD/initrd | cpio -i --force-local --no-absolute-filenames 2>/dev/null ;;
* )
printf "\tcheck_mkinitrd: ERR. Error while extracting initrd file.'\n"
return 2
esac
if [ -d boot ]; then
grep -E -- $MCMD boot/* 2>&1 >/dev/null
FLG1=$?
grep -E -- load_policy boot/* 2>&1 >/dev/null
FLG2=$?
else
# looks like we're using dracut/systemd. We can only check if libselinux1
# exists
if [ -f usr/lib64/libselinux.so.1 ]; then
# if this exists
FLG1=0
FLG2=0
fi
fi
popd 2>&1>/dev/null
if [ $FLG1 == 0 -a $FLG2 == 0 ];then
printf "\tcheck_mkinitrd: OK. Your initrd seems to be correct.\n"
return 0
else
printf "\tcheck_mkinitrd: ERR. Your initrd seems not to mount /proc of\n"
printf "\t the root filesystem during boot and/or load_policy\n"
printf "\t is missing,\n"
printf "\t this may be a reason for SELinux not working.\n"
return 1
fi
}
check_pam()
{
AA_PAM=0
SE_PAM=0
# test for AA pam module
grep apparmor /etc/pam.d/* 2>&1 >/dev/null
FLG=$?
if [ $FLG == 0 ]; then
AA_PAM=1
fi
# test for SELinux pam module
grep selinux /etc/pam.d/* 2>&1 >/dev/null
FLG=$?
if [ $FLG == 0 ]; then
SE_PAM=1
fi
# suggest config
if [ $SE_PAM == 1 ] && [ $AA_PAM == 0 ]; then
printf "\tcheck_pam: OK. Your PAM configuration seems to be correct.\n"
return 0
fi
printf "\tcheck_pam: ERR. Your PAM configuration seems to be incorrect.\n"
if [ $AA_PAM == 1 ]; then
printf " execute 'pam-config -d --apparmor' as root\n"
fi
if [ $SE_PAM == 0 ]; then
printf " execute 'pam-config -a --selinux' as root\n"
fi
return 1
}
check_initupstart()
{
CFGFILE="/etc/selinux/config"
if ! [ -f $CFGFILE ]; then
printf "\tcheck_initupstart: ERR. $CFGFILE does not exist.\n"
return 1;
fi
}
check_runlevel()
{
if [ "$(systemctl is-enabled restorecond.service 2>/dev/null)" == "enabled" ]; then
printf "\tcheck_runlevel: OK. restorecond is enabled on your system\n"
return 0;
fi
printf "\tcheck_runlevel: ERR. please enable restorecond with systemctl enable restorecond.service.\n"
return 1
}
check_packages()
{
PKGLST="checkpolicy policycoreutils selinux-tools libselinux1 libsepol2 libsemanage2 restorecond"
FAIL=0
for i in $PKGLST
do
rpm -q $i 1>&2 >/dev/null
if [ $? == 1 ];then
printf "\tcheck_packages: ERR. Package '$i' not installed, please run 'zypper in $i' as root\n"
FAIL=1
fi
done
if [ $FAIL == 0 ]; then
printf "\tcheck_packages: OK. All essential packages are installed\n"
return 0
else
return 1
fi
}
check_config()
{
CF="/etc/selinux/config"
if [ -f $CF ];then
printf "\tcheck_config: OK. Config file seems to be there.\n"
# with -L because /etc/selinux/config is now a link to /etc/sysconfig/selinux-policy
if ! [ $(stat -L --printf=%a $CF) -eq "644" ]; then
printf "\tcheck_config: ERR. Config file '$CF' has wrong permissions.\n"
return 1
fi
# check that SELINUX is not disabled there
SELINUX_MODE=$(grep "^\s*SELINUX\s*=" $CF | sed "s/SELINUX\s*=\(\S*\)\s*"/\\1/)
case "$SELINUX_MODE" in
permissive | enforcing )
printf "\tcheck_config: OK. SELINUX is set to '$SELINUX_MODE'.\n"
return 0
;;
* )
printf "\tcheck_config: ERR. SELINUX is set to '$SELINUX_MODE' in '$CF'. Should be either 'permissive' or 'enforcing'\n"
return 1
;;
esac
else
printf "\tcheck_config: ERR. Config file '$CF' is missing.\n"
return 1
fi
}
TD=$(mktemp -q -d /tmp/selinux-ready.XXXXXX)
echo "Start checking your system if it is selinux-ready or not:"
check_dir
check_filesystem
check_boot
check_mkinitrd
check_packages
check_config
check_initupstart
check_pam
check_runlevel
rm -rf $TD