KVM

KVM è un'infrastruttura di virtualizzazione del kernel Linux. KVM attualmente supporta una completa virtualizzazione usando Intel VT o AMD-V

Configurazione

100GB disco qcow2 e 1GB swap, rete bridge breig0, server VNC (non interferisce con le regole di iptables in basso), dispositivo RNG /dev/random, processore opteron_g3, <emulator> /usr/bin/kvm

tasksel

--- ambiente desktop, --- server di stampa, +++ server ssh

aptitude install htop iotop jnettop git p7zip lynis colordiff tmux wipe netcat-openbsd tcpdump iperf w3m pv nmap zerofree iputils-tracepath parted mosh rsync mtr-tiny curl command-not-found checksecurity debsums rkhunter clamav build-essential checkinstall cmake dpkg-dev diffutils monkeysphere iptables-persistent vim fdupes ssmtp console-data debian-goodies ntp

software per log e sicurezza

Possono essere configurati per mandare mail, per ora scrivono in /var/log/ e in /var/mail/eigen

• checksecurity: fa una serie di controlli su problemi di sicurezza comuni
• tiger: controlla la configurazione del sistema alla ricerca di problemi
• rkhunter: cerca rootkit sul sitema
• unhide: cerca processi nascosti
• debsums: controlla gli hash di tutti i pacchetti installati (binari e file di configurazione)
• clamav: antivirus

Alcuni sono pesanti ed è inutile farli girare sempre

chmod -x /etc/cron.daily/tripwire

aggiornare i pacchetti

aptitude update && aptitude full-upgrade

Per aggiornare la cache di apt-file e command-not-found

apt-file update
update-command-not-found

Dopo aver clonato

bisogna modificare questi file

• /etc/network/interfaces (cambiare ip)
• /etc/hostname (aggiornare hostname)
• /etc/hosts

e per evitare che tutte le chiavi del server ssh siano uguali

rm /etc/ssh/ssh_host_* && dpkg-reconfigure openssh-server

installare monkeysphere

Inserire, uno per riga, gli id delle chiavi PGP da autorizzare (es. Tizio <tizio@eigenlab.org>).

mkdir .monkeysphere
nano .monkeysphere/authorized_user_ids

Impostare il certificatore, ovvero la chiave che deve firmare tutte le chiavi in authorized_user_ids affinchè queste possano accedere. È necessario inserire la fingerprint completa (senza spazi) e non l'ID composto da 8 cifre.

monkeysphere-authentication c+ chiave

Aggiornare la lista delle chiavi autorizzate in modo che gli utenti inseriti possano accedere al server

monkeysphere-authentication update-users

Modifiche ai file di configurazione nelle VM

/etc/rkhunter.conf

#DISABLE_TESTS=suspscan hidden_procs deleted_files packet_cap_apps apps
DISABLE_TESTS=suspscan deleted_files packet_cap_apps apps

.bashrc

export LS_OPTIONS='--color=auto'
eval "`dircolors`"
alias ls='ls $LS_OPTIONS'
alias ll='ls $LS_OPTIONS -l'
alias l='ls $LS_OPTIONS -lA'

HISTSIZE=500000
HISTFILESIZE=500000000

force_color_prompt=yes

if [ -n "$force_color_prompt" ]; then
    if [ -x /usr/bin/tput ] && tput setaf 1 >&/dev/null; then
        # We have color support; assume it's compliant with Ecma-48
        # (ISO/IEC-6429). (Lack of such support is extremely rare, and such
        # a case would tend to support setf rather than setaf.)
        color_prompt=yes
    else
        color_prompt=
    fi
fi

if [ "$color_prompt" = yes ]; then
    PS1='${debian_chroot:+($debian_chroot)}\[\033[01;31m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w\[\033[00m\]\$ '
else
    PS1='${debian_chroot:+($debian_chroot)}\u@\h:\w\$ '
fi
unset color_prompt force_color_prompt

/etc/ssh/sshd_config

AuthorizedKeysFile /var/lib/monkeysphere/authorized_keys/%u
PasswordAuthentication no

Per adesso c'è la chiave dei nodi. è da rimuovere dopo aver configurato monkeysphere (aggiungere i certificatori con "monkeysphere-authentication add-identity-certifier $fingerprint" e gli id autorizzati in .monkeysphere/authorized_user_ids)

/root/.ssh/authorized_keys

ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCr+J+hhlUnYhKLOnW55aZhJrdHHSQU9XXoP0DcMuvIQ3+SYV6ZZJLMvcdN7puSdkcKiK9DEpsN8uCWfIsxu8LkWJfq6Q/DUBkwvXgKlpbisFaj82ucy7ioiZ1aEc6LMQ/VxG4iHCnGXjWqNLA9sB9lgVDXD29lm8n/i99DHNI8TLHzV9aXz3uR39IqvD4zFBZPSsoDvZ9BsOC6TIUl+Ua0lx1olJxwGawK9he52G55RHhMI+NYj5/wMp80kOhtzRN5F0wRt08Yv2Wu0Kx9akRJBOmI+CcfxxEk7Fcg/kCHG8evS4i4chSMBbBLjOhTk/+Q6nbT3TNIeG2LAtUpml2f node_key@eigenlab

/etc/monkeysphere/monkeysphere-authentication.conf

LOG_LEVEL=DEBUG
RAW_AUTHORIZED_KEYS="%h/.ssh/authorized_keys"

/etc/crontab

0  *    * * *   root    /usr/sbin/monkeysphere-authentication update-users &> /dev/null

/etc/iptables/rules.v4

*filter
:INPUT DROP [0:0]
:FORWARD DROP [0:0]
:OUTPUT ACCEPT [1:176]
-A INPUT -i lo -j ACCEPT

-A INPUT -m conntrack --ctstate INVALID -j DROP
-A INPUT -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT

-A INPUT -p icmp --icmp-type destination-unreachable -j ACCEPT
-A INPUT -p icmp --icmp-type source-quench -j ACCEPT
-A INPUT -p icmp --icmp-type time-exceeded -j ACCEPT
-A INPUT -p icmp --icmp-type parameter-problem -j ACCEPT
-A INPUT -p icmp --icmp-type echo-request -j ACCEPT

-A INPUT -p tcp --dport 22 -j ACCEPT

COMMIT

/etc/iptables/rules.v6

• filter

INPUT DROP [0:0]

FORWARD DROP [0:0]

OUTPUT ACCEPT [0:0]

-A INPUT -i lo -j ACCEPT

-A INPUT -m rt --rt-type 0 -j DROP

-A INPUT -p icmpv6 --icmpv6-type neighbor-solicitation -m hl --hl-eq 255 -j ACCEPT -A INPUT -p icmpv6 --icmpv6-type neighbor-advertisement -m hl --hl-eq 255 -j ACCEPT

-A INPUT -s fe80::/10 -p icmpv6 --icmpv6-type echo-reply -j ACCEPT -A INPUT -m conntrack --ctstate INVALID -j DROP -A INPUT -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT

-A INPUT -p icmpv6 --icmpv6-type destination-unreachable -j ACCEPT -A INPUT -p icmpv6 --icmpv6-type packet-too-big -j ACCEPT -A INPUT -p icmpv6 --icmpv6-type time-exceeded -j ACCEPT -A INPUT -p icmpv6 --icmpv6-type parameter-problem -j ACCEPT -A INPUT -p icmpv6 --icmpv6-type echo-request -j ACCEPT

-A INPUT -p tcp --dport 22 -j ACCEPT

COMMIT

/etc/resolv.conf

domain eigenlab.org
search eigenlab.org 
nameserver 10.174.0.100
nameserver 10.174.0.101

/etc/network/interfaces

auto lo
iface lo inet loopback

# The primary network interface
allow-hotplug eth0
#iface eth0 inet dhcp

auto eth0
iface eth0 inet static
        address 10.175.1.33
        netmask 255.254.0.0
        gateway 10.175.0.1

iface eth0 inet6 static
        address 2a00:1508:1:f010::1:33
        netmask 64
        gateway 2a00:1508:1:f010::1

/etc/pam.d/su

auth       required   pam_wheel.so

/etc/ssmtp/ssmtp.conf

#
# Config file for sSMTP sendmail
#
# The person who gets all mail for userids < 1000
# Make this empty to disable rewriting.
root=tuttisuitetti@eigenlab.org

# The place where the mail goes. The actual machine name is required no 
# MX records are consulted. Commonly mailhosts are named mail.domain.com
mailhub=mail.gandi.net:587

# Where will the mail seem to come from?
#rewriteDomain=

# The full hostname
hostname=eigenlab.org

# Are users allowed to set their own From: address?
# YES - Allow the user to specify their own From: address
# NO - Use the system generated From: address
#FromLineOverride=YES


UseTLS=YES
UseSTARTTLS=YES
rewriteDomain=eigenlab.org
AuthUser=tuttisuitetti@eigenlab.org
AuthPass=Passw0rd