Nombre: checksec.sh
Autor: Tobias Klein.
Visto en
tty0
Descripción: Script diseñado para probar las características de seguridad "estándar" que están siendo utilizadas en un Sistema Operativo Linux y Pax (http://pax.grsecurity.net/)
#!/bin/bash
#
# The BSD License (http://www.opensource.org/licenses/bsd-license.php)
# specifies the terms and conditions of use for checksec.sh:
#
# Copyright (c) 2009-2011, Tobias Klein.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in
# the documentation and/or other materials provided with the
# distribution.
# * Neither the name of Tobias Klein nor the name of trapkit.de may be
# used to endorse or promote products derived from this software
# without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
# COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
# THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
# DAMAGE.
#
# Name : checksec.sh
# Version : 1.5
# Author : Tobias Klein
# Date : November 2011
# Download: http://www.trapkit.de/tools/checksec.html
# Changes : http://www.trapkit.de/tools/checksec_changes.txt
#
# Description:
#
# Modern Linux distributions offer some mitigation techniques to make it
# harder to exploit software vulnerabilities reliably. Mitigations such
# as RELRO, NoExecute (NX), Stack Canaries, Address Space Layout
# Randomization (ASLR) and Position Independent Executables (PIE) have
# made reliably exploiting any vulnerabilities that do exist far more
# challenging. The checksec.sh script is designed to test what *standard*
# Linux OS and PaX (http://pax.grsecurity.net/) security features are being
# used.
#
# As of version 1.3 the script also lists the status of various Linux kernel
# protection mechanisms.
#
# Credits:
#
# Thanks to Brad Spengler (grsecurity.net) for the PaX support.
# Thanks to Jon Oberheide (jon.oberheide.org) for the kernel support.
# Thanks to Ollie Whitehouse (Research In Motion) for rpath/runpath support.
#
# Others that contributed to checksec.sh (in no particular order):
#
# Simon Ruderich, Denis Scherbakov, Stefan Kuttler, Radoslaw Madej,
# Anthony G. Basile, Martin Vaeth and Brian Davis.
#
# global vars
have_readelf=1
verbose=false
# SELinux prefix
# Set where the script must search for the SELinux bin files.
se_prefix='/usr/sbin'
# FORTIFY_SOURCE vars
FS_end=_chk
FS_cnt_total=0x
FS_cnt_checked=0
FS_cnt_unchecked=0
FS_chk_func_libc=0
FS_functions=0
FS_libc=0
# version information
version() {
echo "checksec v1.5, Tobias Klein, www.trapkit.de, November 2011"
echo
}
# help
help() {
echo "Usage: checksec [OPTION]"
echo
echo "Options:"
echo
echo " --file "
echo " --dir [-v]"
echo " --proc "
echo " --proc-all"
echo " --proc-libs "
echo " --kernel"
echo " --fortify-file "
echo " --fortify-proc "
echo " --version"
echo " --help"
echo
echo "For more information, see:"
echo " http://www.trapkit.de/tools/checksec.html"
echo
}
# check if command exists
command_exists () {
type $1 > /dev/null 2>&1;
}
# check if directory exists
dir_exists () {
[ -d $1 ] || return 1
}
# check user privileges
root_privs () {
[ $UID -eq 0 ] || return 1
}
# check if input is numeric
isNumeric () {
echo "$@" | grep -q -v "[^0-9]" && return 0
}
# check if input is a string
isString () {
echo "$@" | grep -q -v "[^A-Za-z]" && return 0
}
# check file(s)
filecheck() {
# check for RELRO support
if readelf -l $1 2>/dev/null | grep -q 'GNU_RELRO'; then
if readelf -d $1 2>/dev/null | grep -q 'BIND_NOW'; then
echo -n -e '\033[32mFull RELRO \033[m '
else
echo -n -e '\033[33mPartial RELRO\033[m '
fi
else
echo -n -e '\033[31mNo RELRO \033[m '
fi
# check for stack canary support
if readelf -s $1 2>/dev/null | grep -q '__stack_chk_fail'; then
echo -n -e '\033[32mCanary found \033[m '
else
echo -n -e '\033[31mNo canary found\033[m '
fi
# check for NX support
if readelf -W -l $1 2>/dev/null | grep 'GNU_STACK' | grep -q 'RWE'; then
echo -n -e '\033[31mNX disabled\033[m '
else
echo -n -e '\033[32mNX enabled \033[m '
fi
# check for PIE support
if readelf -h $1 2>/dev/null | grep -q 'Type:[[:space:]]*EXEC'; then
echo -n -e '\033[31mNo PIE \033[m '
elif readelf -h $1 2>/dev/null | grep -q 'Type:[[:space:]]*DYN'; then
if readelf -d $1 2>/dev/null | grep -q '(DEBUG)'; then
echo -n -e '\033[32mPIE enabled \033[m '
else
echo -n -e '\033[33mDSO \033[m '
fi
else
echo -n -e '\033[33mNot an ELF file\033[m '
fi
# check for rpath / run path
if readelf -d $1 2>/dev/null | grep -q 'rpath'; then
echo -n -e '\033[31mRPATH \033[m '
else
echo -n -e '\033[32mNo RPATH \033[m '
fi
if readelf -d $1 2>/dev/null | grep -q 'runpath'; then
echo -n -e '\033[31mRUNPATH \033[m '
else
echo -n -e '\033[32mNo RUNPATH \033[m '
fi
}
# check process(es)
proccheck() {
# check for RELRO support
if readelf -l $1/exe 2>/dev/null | grep -q 'Program Headers'; then
if readelf -l $1/exe 2>/dev/null | grep -q 'GNU_RELRO'; then
if readelf -d $1/exe 2>/dev/null | grep -q 'BIND_NOW'; then
echo -n -e '\033[32mFull RELRO \033[m '
else
echo -n -e '\033[33mPartial RELRO \033[m '
fi
else
echo -n -e '\033[31mNo RELRO \033[m '
fi
else
echo -n -e '\033[31mPermission denied (please run as root)\033[m\n'
exit 1
fi
# check for stack canary support
if readelf -s $1/exe 2>/dev/null | grep -q 'Symbol table'; then
if readelf -s $1/exe 2>/dev/null | grep -q '__stack_chk_fail'; then
echo -n -e '\033[32mCanary found \033[m '
else
echo -n -e '\033[31mNo canary found \033[m '
fi
else
if [ "$1" != "1" ] ; then
echo -n -e '\033[33mPermission denied \033[m '
else
echo -n -e '\033[33mNo symbol table found\033[m '
fi
fi
# first check for PaX support
if cat $1/status 2> /dev/null | grep -q 'PaX:'; then
pageexec=( $(cat $1/status 2> /dev/null | grep 'PaX:' | cut -b6) )
segmexec=( $(cat $1/status 2> /dev/null | grep 'PaX:' | cut -b10) )
mprotect=( $(cat $1/status 2> /dev/null | grep 'PaX:' | cut -b8) )
randmmap=( $(cat $1/status 2> /dev/null | grep 'PaX:' | cut -b9) )
if [[ "$pageexec" = "P" || "$segmexec" = "S" ]] && [[ "$mprotect" = "M" && "$randmmap" = "R" ]] ; then
echo -n -e '\033[32mPaX enabled\033[m '
elif [[ "$pageexec" = "p" && "$segmexec" = "s" && "$randmmap" = "R" ]] ; then
echo -n -e '\033[33mPaX ASLR only\033[m '
elif [[ "$pageexec" = "P" || "$segmexec" = "S" ]] && [[ "$mprotect" = "m" && "$randmmap" = "R" ]] ; then
echo -n -e '\033[33mPaX mprot off \033[m'
elif [[ "$pageexec" = "P" || "$segmexec" = "S" ]] && [[ "$mprotect" = "M" && "$randmmap" = "r" ]] ; then
echo -n -e '\033[33mPaX ASLR off\033[m '
elif [[ "$pageexec" = "P" || "$segmexec" = "S" ]] && [[ "$mprotect" = "m" && "$randmmap" = "r" ]] ; then
echo -n -e '\033[33mPaX NX only\033[m '
else
echo -n -e '\033[31mPaX disabled\033[m '
fi
# fallback check for NX support
elif readelf -W -l $1/exe 2>/dev/null | grep 'GNU_STACK' | grep -q 'RWE'; then
echo -n -e '\033[31mNX disabled\033[m '
else
echo -n -e '\033[32mNX enabled \033[m '
fi
# check for PIE support
if readelf -h $1/exe 2>/dev/null | grep -q 'Type:[[:space:]]*EXEC'; then
echo -n -e '\033[31mNo PIE \033[m '
elif readelf -h $1/exe 2>/dev/null | grep -q 'Type:[[:space:]]*DYN'; then
if readelf -d $1/exe 2>/dev/null | grep -q '(DEBUG)'; then
echo -n -e '\033[32mPIE enabled \033[m '
else
echo -n -e '\033[33mDynamic Shared Object\033[m '
fi
else
echo -n -e '\033[33mNot an ELF file \033[m '
fi
}
# check mapped libraries
libcheck() {
libs=( $(awk '{ print $6 }' /proc/$1/maps | grep '/' | sort -u | xargs file | grep ELF | awk '{ print $1 }' | sed 's/:/ /') )
printf "\n* Loaded libraries (file information, # of mapped files: ${#libs[@]}):\n\n"
for element in $(seq 0 $((${#libs[@]} - 1)))
do
echo " ${libs[$element]}:"
echo -n " "
filecheck ${libs[$element]}
printf "\n\n"
done
}
# check for system-wide ASLR support
aslrcheck() {
# PaX ASLR support
if !(cat /proc/1/status 2> /dev/null | grep -q 'Name:') ; then
echo -n -e ':\033[33m insufficient privileges for PaX ASLR checks\033[m\n'
echo -n -e ' Fallback to standard Linux ASLR check'
fi
if cat /proc/1/status 2> /dev/null | grep -q 'PaX:'; then
printf ": "
if cat /proc/1/status 2> /dev/null | grep 'PaX:' | grep -q 'R'; then
echo -n -e '\033[32mPaX ASLR enabled\033[m\n\n'
else
echo -n -e '\033[31mPaX ASLR disabled\033[m\n\n'
fi
else
# standard Linux 'kernel.randomize_va_space' ASLR support
# (see the kernel file 'Documentation/sysctl/kernel.txt' for a detailed description)
ASLR=$(/sbin/sysctl -n kernel.randomize_va_space 2> /dev/null)
printf " (Address Space Layout Randomization): "
if [ ! -z $ASLR ] ; then
if [ $ASLR -ge 2 ]; then
echo -n -e '\033[32mOn (Setting: 2)\033[m\n\n'
printf " Description - Make the addresses of mmap base, heap, stack and VDSO page randomized.\n"
printf " This, among other things, implies that shared libraries will be loaded to random \n"
printf " addresses. Also for PIE-linked binaries, the location of code start is randomized.\n\n"
elif [ $ASLR -eq 1 ]; then
echo -n -e '\033[33mOn (Setting: 1)\033[m\n\n'
printf " Description - Make the addresses of mmap base, stack and VDSO page randomized.\n"
printf " This, among other things, implies that shared libraries will be loaded to \n"
printf " random addresses. Also for PIE-linked binaries, the location of code start\n"
printf " is randomized. Heap addresses are *not* randomized.\n\n"
elif [ $ASLR -eq 0 ]; then
echo -n -e '\033[31mOff (Setting:0)\033[m\n'
fi
else
echo -n -e '\033[31mNot kernel support\033[m\n'
fi
printf " See the kernel file 'Documentation/sysctl/kernel.txt' for more details.\n\n"
fi
}
# check cpu nx flag
nxcheck() {
if grep -q nx /proc/cpuinfo; then
echo -n -e '\033[32mYes\033[m\n\n'
else
echo -n -e '\033[31mNo\033[m\n\n'
fi
}
# check for kernel protection mechanisms
kernelcheck() {
printf " Description - List the status of kernel protection mechanisms. Rather than\n"
printf " inspect kernel mechanisms that may aid in the prevention of exploitation of\n"
printf " userspace processes, this option lists the status of kernel configuration\n"
printf " options that harden the kernel itself against attack.\n\n"
printf " Kernel version: \033[33m%s\033[m - OS architecture: \033[33m%s\033[m\n" $(/bin/uname -r) $(/bin/uname -m)
printf " Kernel config : "
if [ -f /proc/config.gz ] ; then
kconfig="zcat /proc/config.gz"
printf "\033[32m/proc/config.gz\033[m\n\n"
elif [ -f /boot/config-`uname -r` ] ; then
kconfig="cat /boot/config-`uname -r`"
printf "\033[33m/boot/config-`uname -r`\033[m\n\n"
printf " Warning: The config on disk may not represent running kernel config!\n\n";
elif [ -f "${KBUILD_OUTPUT:-/usr/src/linux}"/.config ] ; then
kconfig="cat ${KBUILD_OUTPUT:-/usr/src/linux}/.config"
printf "\033[33m%s\033[m\n\n" "${KBUILD_OUTPUT:-/usr/src/linux}/.config"
printf " Warning: The config on disk may not represent running kernel config!\n\n";
else
printf "\033[31mNOT FOUND\033[m\n\n"
exit 0
fi
printf " GCC stack protector support: "
if $kconfig | grep -qi 'CONFIG_CC_STACKPROTECTOR=y'; then
printf "\033[32mEnabled\033[m\n"
else
printf "\033[31mDisabled\033[m\n"
fi
printf " Strict user copy checks: "
if $kconfig | grep -qi 'CONFIG_DEBUG_STRICT_USER_COPY_CHECKS=y'; then
printf "\033[32mEnabled\033[m\n"
else
printf "\033[31mDisabled\033[m\n"
fi
printf " Enforce read-only kernel data: "
if $kconfig | grep -qi 'CONFIG_DEBUG_RODATA=y'; then
printf "\033[32mEnabled\033[m\n"
else
printf "\033[31mDisabled\033[m\n"
fi
printf " Restrict /dev/mem access: "
if $kconfig | grep -qi 'CONFIG_STRICT_DEVMEM=y'; then
printf "\033[32mEnabled\033[m\n"
else
printf "\033[31mDisabled\033[m\n"
fi
printf " Restrict /dev/kmem access: "
if $kconfig | grep -qi 'CONFIG_DEVKMEM=y'; then
printf "\033[31mDisabled\033[m\n"
else
printf "\033[32mEnabled\033[m\n"
fi
printf "\n"
printf "* grsecurity / PaX: "
if $kconfig | grep -qi 'CONFIG_GRKERNSEC=y'; then
if $kconfig | grep -qi 'CONFIG_GRKERNSEC_HIGH=y'; then
printf "\033[32mHigh GRKERNSEC\033[m\n\n"
elif $kconfig | grep -qi 'CONFIG_GRKERNSEC_MEDIUM=y'; then
printf "\033[33mMedium GRKERNSEC\033[m\n\n"
elif $kconfig | grep -qi 'CONFIG_GRKERNSEC_LOW=y'; then
printf "\033[31mLow GRKERNSEC\033[m\n\n"
else
printf "\033[33mCustom GRKERNSEC\033[m\n\n"
fi
printf " Non-executable kernel pages: "
if $kconfig | grep -qi 'CONFIG_PAX_KERNEXEC=y'; then
printf "\033[32mEnabled\033[m\n"
else
printf "\033[31mDisabled\033[m\n"
fi
printf " Prevent userspace pointer deref: "
if $kconfig | grep -qi 'CONFIG_PAX_MEMORY_UDEREF=y'; then
printf "\033[32mEnabled\033[m\n"
else
printf "\033[31mDisabled\033[m\n"
fi
printf " Prevent kobject refcount overflow: "
if $kconfig | grep -qi 'CONFIG_PAX_REFCOUNT=y'; then
printf "\033[32mEnabled\033[m\n"
else
printf "\033[31mDisabled\033[m\n"
fi
printf " Bounds check heap object copies: "
if $kconfig | grep -qi 'CONFIG_PAX_USERCOPY=y'; then
printf "\033[32mEnabled\033[m\n"
else
printf "\033[31mDisabled\033[m\n"
fi
printf " Disable writing to kmem/mem/port: "
if $kconfig | grep -qi 'CONFIG_GRKERNSEC_KMEM=y'; then
printf "\033[32mEnabled\033[m\n"
else
printf "\033[31mDisabled\033[m\n"
fi
printf " Disable privileged I/O: "
if $kconfig | grep -qi 'CONFIG_GRKERNSEC_IO=y'; then
printf "\033[32mEnabled\033[m\n"
else
printf "\033[31mDisabled\033[m\n"
fi
printf " Harden module auto-loading: "
if $kconfig | grep -qi 'CONFIG_GRKERNSEC_MODHARDEN=y'; then
printf "\033[32mEnabled\033[m\n"
else
printf "\033[31mDisabled\033[m\n"
fi
printf " Hide kernel symbols: "
if $kconfig | grep -qi 'CONFIG_GRKERNSEC_HIDESYM=y'; then
printf "\033[32mEnabled\033[m\n"
else
printf "\033[31mDisabled\033[m\n"
fi
else
printf "\033[31mNo GRKERNSEC\033[m\n\n"
printf " The grsecurity / PaX patchset is available here:\n"
printf " http://grsecurity.net/\n"
fi
printf "\n"
printf "* Kernel Heap Hardening: "
if $kconfig | grep -qi 'CONFIG_KERNHEAP=y'; then
if $kconfig | grep -qi 'CONFIG_KERNHEAP_FULLPOISON=y'; then
printf "\033[32mFull KERNHEAP\033[m\n\n"
else
printf "\033[33mPartial KERNHEAP\033[m\n\n"
fi
else
printf "\033[31mNo KERNHEAP\033[m\n\n"
printf " The KERNHEAP hardening patchset is available here:\n"
printf " https://www.subreption.com/kernheap/\n\n"
fi
# Check SELinux support, status and configuration.
printf " SELinux support:"
if $kconfig | grep -qi 'CONFIG_SECURITY_SELINUX=y'; then
if [ ! -e ${se_prefix}/sestatus ] || [ ! -e ${se_prefix}/getenforce ]; then
printf "\033[31m SELinux kernel support but no utils installed\033[m\n\n"
exit
else
printf "\033[32m SELinux kernel support\033[m\n"
fi
if ( $kconfig 1> /dev/null ); then
printf " SELinux mode: "
se_status=$($se_prefix/getenforce)
[ $se_status = 'Enforcing' ] && printf "\033[32m Enforcing\033[m\n"
[ $se_status = 'Permissive' ] && printf "\033[33m Permissive\033[m\n"
[ $se_status = 'Disabled' ] && printf "\033[31m Disabled\033[m\n"
printf " SELinux policy:"
se_policy=$($se_prefix/sestatus | grep "Policy from config file" | awk -F: {'print $2'})
[ $se_policy = 'targeted' ] && printf "\033[33m Targeted \033[m\n\n"
[ $se_policy = 'stric' ] && printf "\033[32m Stric\033[m\n\n"
fi
printf " Warning: The config may represent the running SELinux config!\n\n"
else
printf "\033[31m No Kernel SELinux support\033[m\n\n"
fi
}
# --- FORTIFY_SOURCE subfunctions (start) ---
# is FORTIFY_SOURCE supported by libc?
FS_libc_check() {
printf "* FORTIFY_SOURCE support available (libc) : "
if [ "${#FS_chk_func_libc[@]}" != "0" ] ; then
printf "\033[32mYes\033[m\n"
else
printf "\033[31mNo\033[m\n"
exit 1
fi
}
# was the binary compiled with FORTIFY_SOURCE?
FS_binary_check() {
printf "* Binary compiled with FORTIFY_SOURCE support: "
for FS_elem_functions in $(seq 0 $((${#FS_functions[@]} - 1)))
do
if [[ ${FS_functions[$FS_elem_functions]} =~ _chk ]] ; then
printf "\033[32mYes\033[m\n"
return
fi
done
printf "\033[31mNo\033[m\n"
exit 1
}
FS_comparison() {
echo
printf " ------ EXECUTABLE-FILE ------- . -------- LIBC --------\n"
printf " FORTIFY-able library functions | Checked function names\n"
printf " -------------------------------------------------------\n"
for FS_elem_libc in $(seq 0 $((${#FS_chk_func_libc[@]} - 1)))
do
for FS_elem_functions in $(seq 0 $((${#FS_functions[@]} - 1)))
do
FS_tmp_func=${FS_functions[$FS_elem_functions]}
FS_tmp_libc=${FS_chk_func_libc[$FS_elem_libc]}
if [[ $FS_tmp_func =~ ^$FS_tmp_libc$ ]] ; then
printf " \033[31m%-30s\033[m | __%s%s\n" $FS_tmp_func $FS_tmp_libc $FS_end
let FS_cnt_total++
let FS_cnt_unchecked++
elif [[ $FS_tmp_func =~ ^$FS_tmp_libc(_chk) ]] ; then
printf " \033[32m%-30s\033[m | __%s%s\n" $FS_tmp_func $FS_tmp_libc $FS_end
let FS_cnt_total++
let FS_cnt_checked++
fi
done
done
}
FS_summary() {
echo
printf "SUMMARY:\n\n"
printf "* Number of checked functions in libc : ${#FS_chk_func_libc[@]}\n"
printf "* Total number of library functions in the executable: ${#FS_functions[@]}\n"
printf "* Number of FORTIFY-able functions in the executable : %s\n" $FS_cnt_total
printf "* Number of checked functions in the executable : \033[32m%s\033[m\n" $FS_cnt_checked
printf "* Number of unchecked functions in the executable : \033[31m%s\033[m\n" $FS_cnt_unchecked
echo
}
# --- FORTIFY_SOURCE subfunctions (end) ---
if !(command_exists readelf) ; then
printf "\033[31mWarning: 'readelf' not found! It's required for most checks.\033[m\n\n"
have_readelf=0
fi
# parse command-line arguments
case "$1" in
--version)
version
exit 0
;;
--help)
help
exit 0
;;
--dir)
if [ "$3" = "-v" ] ; then
verbose=true
fi
if [ $have_readelf -eq 0 ] ; then
exit 1
fi
if [ -z "$2" ] ; then
printf "\033[31mError: Please provide a valid directory.\033[m\n\n"
exit 1
fi
# remove trailing slashes
tempdir=`echo $2 | sed -e "s/\/*$//"`
if [ ! -d $tempdir ] ; then
printf "\033[31mError: The directory '$tempdir' does not exist.\033[m\n\n"
exit 1
fi
cd $tempdir
printf "RELRO STACK CANARY NX PIE RPATH RUNPATH FILE\n"
for N in [A-Za-z]*; do
if [ "$N" != "[A-Za-z]*" ]; then
# read permissions?
if [ ! -r $N ]; then
printf "\033[31mError: No read permissions for '$tempdir/$N' (run as root).\033[m\n"
else
# ELF executable?
out=`file $N`
if [[ ! $out =~ ELF ]] ; then
if [ "$verbose" = "true" ] ; then
printf "\033[34m*** Not an ELF file: $tempdir/"
file $N
printf "\033[m"
fi
else
filecheck $N
if [ `find $tempdir/$N \( -perm -004000 -o -perm -002000 \) -type f -print` ]; then
printf "\033[37;41m%s%s\033[m" $2 $N
else
printf "%s%s" $tempdir/ $N
fi
echo
fi
fi
fi
done
exit 0
;;
--file)
if [ $have_readelf -eq 0 ] ; then
exit 1
fi
if [ -z "$2" ] ; then
printf "\033[31mError: Please provide a valid file.\033[m\n\n"
exit 1
fi
# does the file exist?
if [ ! -e $2 ] ; then
printf "\033[31mError: The file '$2' does not exist.\033[m\n\n"
exit 1
fi
# read permissions?
if [ ! -r $2 ] ; then
printf "\033[31mError: No read permissions for '$2' (run as root).\033[m\n\n"
exit 1
fi
# ELF executable?
out=`file $2`
if [[ ! $out =~ ELF ]] ; then
printf "\033[31mError: Not an ELF file: "
file $2
printf "\033[m\n"
exit 1
fi
printf "RELRO STACK CANARY NX PIE RPATH RUNPATH FILE\n"
filecheck $2
if [ `find $2 \( -perm -004000 -o -perm -002000 \) -type f -print` ] ; then
printf "\033[37;41m%s%s\033[m" $2 $N
else
printf "%s" $2
fi
echo
exit 0
;;
--proc-all)
if [ $have_readelf -eq 0 ] ; then
exit 1
fi
cd /proc
printf "* System-wide ASLR"
aslrcheck
printf "* Does the CPU support NX: "
nxcheck
printf " COMMAND PID RELRO STACK CANARY NX/PaX PIE\n"
for N in [1-9]*; do
if [ $N != $$ ] && readlink -q $N/exe > /dev/null; then
printf "%16s" `head -1 $N/status | cut -b 7-`
printf "%7d " $N
proccheck $N
echo
fi
done
if [ ! -e /usr/bin/id ] ; then
printf "\n\033[33mNote: If you are running 'checksec.sh' as an unprivileged user, you\n"
printf " will not see all processes. Please run the script as root.\033[m\n\n"
else
if !(root_privs) ; then
printf "\n\033[33mNote: You are running 'checksec.sh' as an unprivileged user.\n"
printf " Too see all processes, please run the script as root.\033[m\n\n"
fi
fi
exit 0
;;
--proc)
if [ $have_readelf -eq 0 ] ; then
exit 1
fi
if [ -z "$2" ] ; then
printf "\033[31mError: Please provide a valid process name.\033[m\n\n"
exit 1
fi
cd /proc
printf "* System-wide ASLR"
aslrcheck
printf "* Does the CPU support NX: "
nxcheck
printf " COMMAND PID RELRO STACK CANARY NX/PaX PIE\n"
for N in `ps -Ao pid,comm | grep $2 | cut -b1-6`; do
if [ -d $N ] ; then
printf "%16s" `head -1 $N/status | cut -b 7-`
printf "%7d " $N
# read permissions?
if [ ! -r $N/exe ] ; then
if !(root_privs) ; then
printf "\033[31mNo read permissions for '/proc/$N/exe' (run as root).\033[m\n\n"
exit 1
fi
if [ ! `readlink $N/exe` ] ; then
printf "\033[31mPermission denied. Requested process ID belongs to a kernel thread.\033[m\n\n"
exit 1
fi
exit 1
fi
proccheck $N
echo
fi
done
exit 0
;;
--proc-libs)
if [ $have_readelf -eq 0 ] ; then
exit 1
fi
if [ -z "$2" ] ; then
printf "\033[31mError: Please provide a valid process ID.\033[m\n\n"
exit 1
fi
if !(isNumeric "$2") ; then
printf "\033[31mError: Please provide a valid process ID.\033[m\n\n"
exit 1
fi
cd /proc
printf "* System-wide ASLR"
aslrcheck
printf "* Does the CPU support NX: "
nxcheck
printf "* Process information:\n\n"
printf " COMMAND PID RELRO STACK CANARY NX/PaX PIE\n"
N=$2
if [ -d $N ] ; then
printf "%16s" `head -1 $N/status | cut -b 7-`
printf "%7d " $N
# read permissions?
if [ ! -r $N/exe ] ; then
if !(root_privs) ; then
printf "\033[31mNo read permissions for '/proc/$N/exe' (run as root).\033[m\n\n"
exit 1
fi
if [ ! `readlink $N/exe` ] ; then
printf "\033[31mPermission denied. Requested process ID belongs to a kernel thread.\033[m\n\n"
exit 1
fi
exit 1
fi
proccheck $N
echo
libcheck $N
fi
exit 0
;;
--kernel)
cd /proc
printf "* Kernel protection information:\n\n"
kernelcheck
exit 0
;;
--fortify-file)
if [ $have_readelf -eq 0 ] ; then
exit 1
fi
if [ -z "$2" ] ; then
printf "\033[31mError: Please provide a valid file.\033[m\n\n"
exit 1
fi
# does the file exist?
if [ ! -e $2 ] ; then
printf "\033[31mError: The file '$2' does not exist.\033[m\n\n"
exit 1
fi
# read permissions?
if [ ! -r $2 ] ; then
printf "\033[31mError: No read permissions for '$2' (run as root).\033[m\n\n"
exit 1
fi
# ELF executable?
out=`file $2`
if [[ ! $out =~ ELF ]] ; then
printf "\033[31mError: Not an ELF file: "
file $2
printf "\033[m\n"
exit 1
fi
if [ -e /lib/libc.so.6 ] ; then
FS_libc=/lib/libc.so.6
elif [ -e /lib64/libc.so.6 ] ; then
FS_libc=/lib64/libc.so.6
elif [ -e /lib/i386-linux-gnu/libc.so.6 ] ; then
FS_libc=/lib/i386-linux-gnu/libc.so.6
elif [ -e /lib/x86_64-linux-gnu/libc.so.6 ] ; then
FS_libc=/lib/x86_64-linux-gnu/libc.so.6
else
printf "\033[31mError: libc not found.\033[m\n\n"
exit 1
fi
FS_chk_func_libc=( $(readelf -s $FS_libc | grep _chk@@ | awk '{ print $8 }' | cut -c 3- | sed -e 's/_chk@.*//') )
FS_functions=( $(readelf -s $2 | awk '{ print $8 }' | sed 's/_*//' | sed -e 's/@.*//') )
FS_libc_check
FS_binary_check
FS_comparison
FS_summary
exit 0
;;
--fortify-proc)
if [ $have_readelf -eq 0 ] ; then
exit 1
fi
if [ -z "$2" ] ; then
printf "\033[31mError: Please provide a valid process ID.\033[m\n\n"
exit 1
fi
if !(isNumeric "$2") ; then
printf "\033[31mError: Please provide a valid process ID.\033[m\n\n"
exit 1
fi
cd /proc
N=$2
if [ -d $N ] ; then
# read permissions?
if [ ! -r $N/exe ] ; then
if !(root_privs) ; then
printf "\033[31mNo read permissions for '/proc/$N/exe' (run as root).\033[m\n\n"
exit 1
fi
if [ ! `readlink $N/exe` ] ; then
printf "\033[31mPermission denied. Requested process ID belongs to a kernel thread.\033[m\n\n"
exit 1
fi
exit 1
fi
if [ -e /lib/libc.so.6 ] ; then
FS_libc=/lib/libc.so.6
elif [ -e /lib64/libc.so.6 ] ; then
FS_libc=/lib64/libc.so.6
elif [ -e /lib/i386-linux-gnu/libc.so.6 ] ; then
FS_libc=/lib/i386-linux-gnu/libc.so.6
elif [ -e /lib/x86_64-linux-gnu/libc.so.6 ] ; then
FS_libc=/lib/x86_64-linux-gnu/libc.so.6
else
printf "\033[31mError: libc not found.\033[m\n\n"
exit 1
fi
printf "* Process name (PID) : %s (%d)\n" `head -1 $N/status | cut -b 7-` $N
FS_chk_func_libc=( $(readelf -s $FS_libc | grep _chk@@ | awk '{ print $8 }' | cut -c 3- | sed -e 's/_chk@.*//') )
FS_functions=( $(readelf -s $2/exe | awk '{ print $8 }' | sed 's/_*//' | sed -e 's/@.*//') )
FS_libc_check
FS_binary_check
FS_comparison
FS_summary
fi
exit 0
;;
*)
if [ "$#" != "0" ] ; then
printf "\033[31mError: Unknown option '$1'.\033[m\n\n"
fi
help
exit 1
;;
esac
Establecemos permisos de ejecución:
chmod +x checksec.sh
Ejecutamos el script de acuerdo a los parámetros que tiene (ver función "help").
