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|
#!/bin/sh
################################################################################
# #
# Copyright (C) 2008-2014 LABBE Corentin <clabbe.montjoie@gmail.com>
#
# YASAT is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# YASAT is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with YASAT. If not, see <http://www.gnu.org/licenses/>.
# #
################################################################################
Title "Check system user"
POSSIBLE_USELESS_USER='games uucp news toor proxy irc gnats gopher'
BASEHOME="/home"
PASSFILE="/etc/shadow"
TMP_LEAK_PASSWORD_FILE="$TEMPYASATDIR/yasat.leak"
if [ "${OS_TYPE}" = "BSD" ] ;then
PASSFILE="/etc/master.passwd"
fi
#Check for readability of PASSFILE (Enforced SELinux deny it for example)
if [ -e "$PASSFILE" ];then
cat $PASSFILE > /dev/null
if [ $? -eq 1 ] ;then
Display --indent 2 --text "$PASSFILE is unreadable (inexistant or access denied)" --result ERROR --color RED
PASSFILE='non-readable'
fi
fi
my_getent
ALLUSER=`grep -v '^#' ${MY_PASSWD} | cut -d\: -f1`
for iuser in $ALLUSER
do
#HOMEUSER=`grep "^${iuser}:" /etc/passwd | cut -d\: -f6`
HOMEUSER=`grep "^${iuser}:" ${MY_PASSWD} | cut -d\: -f6`
#USERSHELL=`grep "^${iuser}:" /etc/passwd | cut -d\: -f7`
USERSHELL=`grep "^${iuser}:" ${MY_PASSWD} | cut -d\: -f7`
PRIMARYGROUP="`id -gn ${iuser}`"
if [ ! -e "${HOMEUSER}" ] ;then
Display --indent 2 --text "The home of $iuser, ${HOMEUSER} dont exist" --result NOTFOUND --color ORANGE --advice SYSTEM_USER_NO_HOMEDIR
HOMEUSER="$BASEHOME/$iuser/"
fi
if [ -e "${HOMEUSER}" ] ;then
Display --indent 2 --text "Check $iuser ${HOMEUSER} " --result FOUND --color GREEN
if [ "${HOMEUSER}" = "/" ] ;then
Display --indent 4 --text "homedir is /" --result WARNING --color RED --advice SYSTEM_USER_HOMEDIR_ROOT_SLASH
fi
if [ -e "${HOMEUSER}/.bashrc" ] ;then
UMASK="`grep 'umask 027' ${HOMEUSER}/.bashrc`"
if [ -z "$UMASK" ] ;then
Display --indent 4 --text "bad umask in bashrc (not 027)" --result WARNING --color RED --advice SYSTEM_USER_UMASK
fi
fi
#TODO check valid shells for warning about "no pass and shells"
#TODO differenciate desactivated account than other
if [ -e "$PASSFILE" ] ; then
PASSWORD=`grep ^${iuser}\: $PASSFILE | cut -d\: -f2`
if [ "$PASSWORD" = '*' ] ;then
if [ ! -z "`echo $USERSHELL | grep -v 'nologin' |grep -v 'bin/false'`" ]
then
Display --indent 4 --text "No pass and shell, why?" --result WARNING --color ORANGE --advice SYSTEM_USER_NOPASS_AND_SHELL
fi
fi
if [ "$PASSWORD" = '!' ] ;then
if [ ! -z "`echo $USERSHELL | grep -v 'nologin' |grep -v 'bin/false'`" ]
then
Display --indent 4 --text "No pass and shell, why?" --result WARNING --color ORANGE --advice SYSTEM_USER_NOPASS_AND_SHELL
fi
fi
#Password is empty, bad
if [ "$PASSWORD" = '' ] ;then
Display --indent 4 --text "Password is empty" --result ERROR --color RED
fi
fi
#end of if PASSFILE
if [ -e "${HOMEUSER}/.ssh/" ];then
if [ `stat $STAT_RIGHT ${HOMEUSER}/.ssh/` != '700' ];then
Display --indent 4 --text "${HOMEUSER}/.ssh is not 700" --result WARNING --color RED --advice SYSTEM_USER_DOTDIR
else
Display --indent 4 --text "${HOMEUSER}/.ssh" --result OK --color GREEN
fi
# find ${HOMEUSER}/.ssh/ ! -user $iuser -ls
TMP_RESULT="${TEMPYASATDIR}/ssh_others"
check_directory_owner "${HOMEUSER}/.ssh/" $iuser $TMP_RESULT 4
# find ${HOMEUSER}/.ssh/ -perm $ORWX -ls
check_directory_others "${HOMEUSER}/.ssh/" $TMP_RESULT 4 GLOBAL_FILE_OTHER_READABLE
if [ -e "${HOMEUSER}/.ssh/authorized_keys" -o -e "${HOMEUSER}/.ssh/authorized_keys2" ];then
Display --indent 4 --text "authorized_keys" --result FOUND --color GREEN
#TODO check this files (content)
fi
#TODO check keysize for < 2048bits (find a good link to explain why)
if [ -e "${HOMEUSER}/.ssh/id_rsa" -o -e "${HOMEUSER}/.ssh/id_rsa.pub" ] ;then
KEY_SIZE="`ssh-keygen -l -f ${HOMEUSER}/.ssh/id_rsa | cut -d\ -f1`"
Display --indent 4 --text "RSA keys found ($KEY_SIZE bits)" --result OK --color GREEN
check_private_key "${HOMEUSER}/.ssh/id_rsa" 4 'ssh' "${iuser}" "$PRIMARYGROUP"
fi
if [ -e "${HOMEUSER}/.ssh/id_dsa" -o -e "${HOMEUSER}/.ssh/id_dsa.pub" ] ;then
#I have read somewhere that DSA is only 1024, so perhaps reading keysize is useless
KEY_SIZE="`ssh-keygen -l -f ${HOMEUSER}/.ssh/id_dsa | cut -d\ -f1`"
Display --indent 4 --text "DSA keys found ($KEY_SIZE bits)" --result OK --color GREEN
check_private_key "${HOMEUSER}/.ssh/id_dsa" 4 'ssh' "${iuser}" "$PRIMARYGROUP"
fi
if [ `stat $STAT_USER ${HOMEUSER}/.ssh/` != $iuser ];then
Display --indent 4 --text "Error ${HOMEUSER}/.ssh/ is not $iuser owned" --result ERROR --color RED
fi
fi
#end if [ -e "${HOMEUSER}/.ssh/" ]
if [ -e "${HOMEUSER}/.gnupg/" ];then
if [ `stat $STAT_RIGHT ${HOMEUSER}/.gnupg/` != '700' ];then
Display --indent 4 --text "$BASEHOME/$iuser/.gnupg is not 700" --result WARNING --color RED --advice SYSTEM_USER_DOTDIR
else
Display --indent 4 --text "$BASEHOME/$iuser/.gnupg" --result OK --color GREEN
fi
fi
#TODO check recusivly the content of the directory
#end of gnupg
if [ -e "${HOMEUSER}/.my.cnf" ]
then
if [ `stat $STAT_RIGHT ${HOMEUSER}/.my.cnf` != '600' ]
then
Display --indent 4 --text "$BASEHOME/$iuser/.my.cnf is not 600" --result WARNING --color RED --advice SYSTEM_USER_DOTFILES
else
Display --indent 4 --text "$BASEHOME/$iuser/.my.cnf" --result OK --color GREEN
fi
fi
#end of my.cnf
#check rights of some files
LIST_USER_FILE=".bashrc .cshrc .exrc .forward .kshrc .login .profile .xinitrc .nessusrc .muttrc .cvspass .rhosts .openvasrc .bash_history .history .k5login .mysql_history .pgpass"
#TODO finish that
for DOT_FILE in $LIST_USER_FILE
do
if [ -e "${HOMEUSER}/${DOT_FILE}" ]
then
DOTFILERIGHT="`stat $STAT_RIGHT ${HOMEUSER}/$DOT_FILE`"
if [ "${DOTFILERIGHT}" != '600' -a "${DOTFILERIGHT}" != '400' ]
then
Display --indent 4 --text "${HOMEUSER}/$DOT_FILE is not 600" --result WARNING --color RED --advice SYSTEM_USER_DOTFILES
else
Display --indent 4 --text "${HOMEUSER}/$DOT_FILE" --result OK --color GREEN
fi
fi
done
#check only "normal" users for the moment
if [ ! -z "`echo ${HOMEUSER} |grep $BASEHOME`" ]
then
TMP_RESULT="${TEMPYASATDIR}/${iuser}.homeresult"
check_directory_others ${HOMEUSER} $TMP_RESULT 4 SYSTEM_USER_HOMEDIR_READABLE_BY_OTHERS
fi
#check for information leaking in .bash_history
#TODO ipmitool -U root user set password 8 xxx ? and other command with clear text password
#TODO list of bad command like ./r00t
if [ -e "${HOMEUSER}/.bash_history" ]
then
cat "${HOMEUSER}/.bash_history" |grep mysql | grep -iE '\-p[^ ]' > "$TMP_LEAK_PASSWORD_FILE"
cat "${HOMEUSER}/.bash_history" |grep ldap | grep -E '\-w|\-a|\-s' >> "$TMP_LEAK_PASSWORD_FILE"
cat ${HOMEUSER}/.bash_history |grep wget | grep -i ':.*@' >> $TMP_LEAK_PASSWORD_FILE
cat ${HOMEUSER}/.bash_history | grep -v '^cd ' |grep -v '^exit[[:space:]]*$' | grep -v '^source[[:space:]]' | grep -v '^export[[:space:]]'|
while read line_of_command
do
COMMAND_TO_CHECK="`echo $line_of_command | sed 's/[[:space:]].*//g'`"
which $COMMAND_TO_CHECK > /dev/null 2> /dev/null
if [ $? -eq 1 ]
then
echo "$line_of_command" >> $TMP_LEAK_PASSWORD_FILE
fi
done
# file with password to test for their right
# cat $bash_h |grep ldap | grep -E '\-y|\-t|\-T'
NBLINE="`cat $TMP_LEAK_PASSWORD_FILE | wc -l`"
if [ $NBLINE -eq 0 ]
then
Display --indent 4 --text ".bash_history" --result GOOD --color GREEN
else
Display --indent 4 --text ".bash_history" --result BAD --color RED --advice SYSTEM_USER_PASSWORD_LEAKING
cat $TMP_LEAK_PASSWORD_FILE | sort | uniq |
while read line_of_command_with_pass
do
echo " $line_of_command_with_pass"
done
fi
fi
#end of bash_history
#Check for PASSWORD() or other line with a password in mysql_history
if [ -e "${HOMEUSER}/.mysql_history" ] ; then
echo -n "" > $TMP_LEAK_PASSWORD_FILE
cat "${HOMEUSER}/.mysql_history" |grep -iE 'identified|PASSWORD' |
while read line_of_command
do
echo "$line_of_command" >> $TMP_LEAK_PASSWORD_FILE
done
NBLINE="`cat $TMP_LEAK_PASSWORD_FILE | wc -l`"
if [ $NBLINE -eq 0 ]
then
Display --indent 4 --text ".mysql_history" --result GOOD --color GREEN
else
Display --indent 4 --text ".mysql_history" --result BAD --color RED --advice SYSTEM_USER_MYSQL_HISTORY_PASSWORD_LEAKING
cat $TMP_LEAK_PASSWORD_FILE | sort | uniq |
while read line_of_command_with_pass
do
echo " $line_of_command_with_pass"
done
fi
fi
if [ -e "${HOMEUSER}/.mozilla/firefox/profiles.ini" ] ; then
if [ -e "${PLUGINS_REP}/system_user.firefox" ] ; then
#get profiles
for profile in `grep '^Path=' "${HOMEUSER}/.mozilla/firefox/profiles.ini" | sed 's/^Path=//'`
do
Display --indent 4 --text "Firefox profile $profile" --result FOUND --color BLUE
PATH_TO_PREFJS="${HOMEUSER}/.mozilla/firefox/$profile/prefs.js"
if [ -e $PATH_TO_PREFJS ] ; then
grep -v ^# "${PLUGINS_REP}/system_user.firefox" |
while read firefox_test
do
FIREFOX_STRING="`echo $firefox_test | cut -d, -f1`"
FIREFOX_ADVICE="`echo $firefox_test | cut -d, -f2`"
if [ ! -z "`grep $FIREFOX_STRING $PATH_TO_PREFJS`" ] ; then
Display --indent 6 --text "$FIREFOX_STRING" --result FOUND --color BLUE --advice "$FIREFOX_ADVICE"
else
Display --indent 6 --text "$FIREFOX_STRING" --result NOTFOUND --color GREEN
fi
done
fi
done
else
Display --indent 4 --text "${PLUGINS_REP}/system_user.firefox" --result NOTFOUND --color REd
fi
fi #end of firefox
fi
#end of if homeuser
for TMP_USELESS in $POSSIBLE_USELESS_USER
do
if [ "$TMP_USELESS" = "$iuser" ]
then
Display --indent 4 --text "is user $iuser useful?" --result WARNING --color ORANGE --advice SYSTEM_USER_USELESS
fi
done
done
#check UID 0 account
USER_ONLY_ONE_UID0=0
cut -d\: -f1,3 ${MY_PASSWD} | grep ':0$' |
while read line
do
if [ "$line" != "root:0" ]
then
USER_ONLY_ONE_UID0=1
USER_UID0="`echo $line | cut -d\: -f1`"
Display --indent 2 --text "Found user $USER_UID0 with UID=0" --result FOUND --color RED --advice SYSTEM_USER_USER_wITH_UID0
fi
done
if [ $USER_ONLY_ONE_UID0 -eq 0 ]
then
Display --indent 2 --text "Only root is UID=0" --result GOOD --color GREEN
fi
#check that shadow is used
cut -d\: -f1,2 ${MY_PASSWD} |grep ':$'|
while read line
do
USER_STRANGE="`echo $line | cut -d\: -f1`"
Display --indent 2 --text "Found anormal $USER_STRANGE" --result FOUND --color RED --advice TODO
done
return 0;
#TODO check_user_cron
#TODO check for a .macromedia and give advice of trash "flash cookies"
|
