AdminSysGNULinux

Liens :

• http://www.linuxjournal.com/content/server-hardening?page=0,0

Note :

• Penser à vérifier le NTP / l'heure des serveurs
• Penser à vérifier le SMTP des fax, scanners, imprimantes

Disques

lsblk

Réseaux

nft list ruleset
iptables -vnxL
ip6tables -vnxL
ip -s macsec show
ss -peaonmi
resolvectl status
resolvectl statistics

Debian DEB Voir audit_debian_differences_de_version_entre_un_fichier_d_origine_et_le_fichier_actuelle

dpkg -l
LANG=C find /etc -type f -exec dpkg -S {} 2>&1 \; |grep -e '^dpkg-query:' |tee jb_dpkg-S.txt
LANG=C debsums -as 2>&1 |tee jb_debsums.txt

Pour RedHat/CentOS RPM

rpm -Va

Exemple

rpm -V -a |egrep -v -e '^missing|/var/run|/var/log|\.jar$' |sed -e 's% c %   %' |awk '{print $2}' |grep -v -e '/$' |cpio -ov --format=ustar |pigz > /tmp/plop/fic-${HOSTNAME}.tar.gz

linux-avoir-des-infos-sur-le-materiel

for MODULE in $(lsmod |sed 1d |awk '{print $1}') ; 
do 
    modinfo $MODULE |grep -e '^filename:' |awk '{print $2}'| xargs dpkg -S || echo -e "\t ERR IN $MODULE";
done 2>&1 |tee  jb_modules.txt

Voir DKMS /var/lib/dkms/megaraid-sas

# LANG=C dpkg -S /var/lib/dkms/megaraid-sas
dpkg-query: no path found matching pattern /var/lib/dkms/megaraid-sas

# dpkg -S /usr/share/dkms/modules_to_force_install/megaraid-sas.force
megaraid-sas-dkms: /usr/share/dkms/modules_to_force_install/megaraid-sas.force

/usr/share/dkms/modules_to_force_install/megaraid-sas.force

megaraid-sas

for user in $(awk -F':' '{print $1}' /etc/passwd) ; do sudo -U $user -l |sed -n -e '/^User /,/$$/p' |sed -e 1d |egrep -q -i '(root|all).*ALL' && echo "$user" ; done

Est-ce que cela fonctionne avec les groupes ? Les netgroups ? etc….

Ne liste pas les utilisateurs ayant des droits sur sh, bash, perl, python etc…

Flux réseaux :

tcpdump tcp -p -qtn -i eth0 and not host 192.168.1.11 

Config Apache

apache2ctl -S 

cat /usr/local/apache/conf/httpd.conf   |sed -n -e '/\<VirtualHost/,/\<\/VirtualHost/p' |egrep -i -e "DocumentRoot|ServerName|ServerAlias|^$" |grep -v -e '^#' |tr -d '\n' | sed -e 's/DocumentRoot/\n/g' | sed -e 's/ServerName/|/g' | sed -e 's/ServerAlias/|ServerAlias/g' |sed -e 's/DocumentRoot/\nDocumentRoot/g' | grep -v -e "^$"  | sed -e 's/[[:space:]]//g' 

Comptes système

# uid0
cat /etc/passwd |awk -F':' '{print $3":"$1}' |grep -e '^0:'
 
# list active account
for compte in $(cat /etc/shadow |awk -F':' '{print $2":"$1}' |egrep -v -e "^\*|^\!" |awk -F ':' '{print $2}')
    do grep -e "^$compte:" /etc/passwd
done > /tmp/ftp1.txt
 
#cat ftp1.txt  |awk -F':'  '{print "| "$1" || || JJ/MM/AAAA || "$6" || "}' |perl -pe 's/\n/\n|-\n/' > ftp.txt 

Réseaux. Serveur

netstat -tapen |grep LISTEN |grep -v '127\.0\.0\.1' |awk '{print "| " $4 " || " $9}' 

Comptes système. Clefs SSH

for hom in $(cut -d':' -f 6 /etc/passwd) ; do ls $hom/$(grep AuthorizedKeysFile /etc/ssh/sshd_config |awk '{print $2}'  |sed -e 's#^%h/##' ) 2>/dev/null ;done 

perl -a -F':' -ne '$HOMEUSER=$F[5] ; $CHAINE="$HOMEUSER/.ssh/authorized_keys\n" ; $CHAINE=~s|//|/| ; print $CHAINE unless /false$/ or /nologin$/' /etc/passwd

Zones DNS

for zone in $(cat /etc/bind/named.conf |grep ^zone |egrep -v 'zone "." IN {|zone "localhost" IN {|zone "127.in-addr.arpa" IN {' |awk '{print $2}'| tr -d '"' |sort);  do dig -t AXFR @127.0.0.1 $zone > /tmp/dns_${HOSTNAME}_${zone}.txt ; done 

MySQL

mysql -u root -p < <(echo "select host, user from mysql.user;") > /tmp/mysql_user.txt 
mysql -u root -p < <(echo "show databases;") > /tmp/mysql_databases.txt 

à un jour et une heure précise

journalctl --since "2019-10-16 06:00" --until "2019-10-16 10:00" 
 
touch -t 1910160600 fic1
touch -t 1910161000 fic2
find / -newer fic1 -not -newer fic2
 
atop -r 20191016
 
sar -A -f /var/log/sa/sa18
 
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