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IP Aliasing with Debian, Shorewall and VMware

2009-05-19T05:17:00.000-07:00

Recently I needed to use the feature IP Failover of my datacenter company. That company is OVH and they have instructions on how to do the following setting the VM machines as host-only. However I wanted to use the VM network as NAT and to the routing with Shorewall.

This is the setup:
Debian Etch as physical server
VMware Server to host virtual machines using NAT networking
Shorewall 3.2.6 installed on the Debian server as a iptables manager.

If you have more than one IP available to your Debian server you can assign both to the only network card of your Debian machine. This is how to:

1- Add the new IP to the network card. Edit the file /etc/network/interfaces to add the following
auto eth0:0
iface eth0:0 inet static
address <NEW IP>

netmask 255.255.255.255

broadcast <NEW IP

network <NEW IP>

You have to activate the new eth0:0 you just created:

ifup eth0:0

2- Check that the new intervace is active with:

ifconfig

3 -Now you have to tell the firewall (Shorewall) that all trafic that comes trhough the specific NEW IP have to be allowed and routed to eth0:0. In our case we want that all traffic coming to that NEW IP con port 80 we want to send it to the specific virtual machine (in or case located at: 172.16.1.10).

Edit /etc/shorewall/rules

#ACTION   SOURCE     DEST                 PROTO      DEST PORT(S)
ACCEPT    net        $FW:(NEW IP)         tcp        80

With this rule we are allowing web traffic from net to the eth0:0

4-Now we new to tell the VMware NAT netkork manager to redirect trafic in port 80 to 172.16.1.10 (this is the IP of your virtual machine). To do this edit:
/etc/vmware/vmnet8/nat/nat.conf

and add this line:
80 = 172.16.1.10:80

5- Restart your vmware server:
/etc/init.d/vmware restart

Now if you boot your virtual machine and write the NEW IP in your web brower you will see how your traffic is redirected to the virtual machine.

Enjoy it!!

IMPORTANT:
'Shorewall can create the alias (additional address) for you if you set ADD_SNAT_ALIASES=Yes in /etc/shorewall/shorewall.conf'
YOU BETTER DISABLE THIS FEATURE BECAUSE IT MESSES YOUR DEBIAN NETWORKING. I set up ADD_SNAT_ALIASES=no

You can visit this for more info:
http://www.shorewall.net/Shorewall_and_Aliased_Interfaces.html
http://help.ovh.co.uk/VMware

Restaurar nuestro sistema de Backup

2008-07-12T13:06:00.000-07:00

Para restaurar nuestro sistema de Backup:

Nos bajamos del servidor ftp el fichero gpg correspondiente a nuestro backup:
ftp ftp.miservidorftp.com
Desciframos el fichero encriptado que acabamos de bajarnos:
gpg -o miacrchivodesencriptado.tar --decrypt archivo.gpg
Descomprimimos nuestro firecho en la ubicación adecuada:
tar xvpfz miacrchivodesencriptado.tar -C /mi/ruta/derescate
(normalmente /mi/ruta/derescate sera el directorio raiz /)

En la situacion en que no queramos restaurar todo el sistema sino solamente aquellos ficheros que se nos hayan borrado y que estén contenidos en el tar, podemos incluir la opcion k (keep old files) que lo que hace es NO sobreescribir los archivos. Asi pues la orden tar quedaria:
tar xkvpfz

Esto dará un error por cada archivo que no se sobreescriba, nada de que preocuparse.

Comandos utiles en Linux

2008-07-08T17:34:00.000-07:00

Busca texto en tus logs rapidamente enumenrando las entradas del texto seleccionado:

zgrep 'Failed password for illegal user' /var/log/auth.log* | wc -l

Enlace de interes:
http://www.blogger.com/post-create.g?blogID=4881799135132719214

VMware Server Backup

2008-07-04T16:07:00.001-07:00

If you are running a virtual machine you can back it up using the script I use that does:
-Stop de virtual machine
-rsync the virtual machine directories
-start the VM (up to here the mahine has been stoped something like 5 minutes (if it is not a huge VM)
-tar the rsync directories
-rsync the backup file to a remote server (optional)
-encrypt the backup file + uploaded to a remote FTP + get an email reporting about the result of the process
-delete old backup files in order to save space on the disks

All this wonderfull features are posible thanks to Gerald Anderson (Left Bain/Hardaur) who initiated all this on an article

The initial script didn't had the encription+ftp+email features so I worked on the code taking pieces of codes from other script

So thank you guys for initiating your job and thank you to have made my script possible.

Here is the script I came up to:

#! /bin/bash
##
## vmsbackup.sh
## Copyright 2008 Gerald D. Anderson
## Licensed under GPL v3, see including LICENSE file.
##
## Version 1.0
## Original: http://www.twobaldgeeks.com/blog/index.php/2007/08/06/vmware-how-do-i-love-thee-let-me-count-the-ways/
##
## ** This is the culmination of work by a number of people, for more information see the above URL. As of 4/13/2008 the
## Project will be hosted a google code with a google group for discussion. Please refer to the following URLs:
##
## Google Code project: http://code.google.com/p/vmsbackup/
## Google Group: http://groups.google.com/group/vmsbackup
##
## Customise these settings:
## -------------------------
## "BACKUP_DEST" where you want the backups to go
## "VMWARE_CMD" the location of vmware-cmd
## "DEBUG" true if you want to see verbose output, else false
## "DAYS_TO_KEEP_TAR" how long before the script removes an old archive
## "BACKUP_ACTIVE_ONLY=true" prevent inactive VMs from being included
## "MODE=suspend" will suspend the VM before backup or
## "MODE=stop" will stop it all together (untested)
## "EXEMPTION_ARRAY" will exclude VMs in any of the specified directories
## "REMOTE_ARCHIVES" if true, will rsync your tar files to a remote host.
## "CLEAN_REMOTE_ARCHIVES" if true, will run rsync with the --delete parameter
## deleting any archive files on remote host that don't exist on this host.
## "REMOTE_ARCHIVE_URL" the remote path parameter for rsync.
##
## Any Virtual Machines in the VMware Server inventory may now be backed up
## by this script however the script WILL fail if you have any spaces in the
## canonical path to the VM. It's now going to be far easier to change your
## directory paths than it is to try and change the way this script handles
## arrays. You can now change your paths and then setup a symlink to the vmx
## file and directory so that VMware server is oblivious to the changed path.
##
## Eg. For a VM located in /mnt/data/Virtual Machines/OS XYZ/OS XYZ.vmx you
## can fix it by changing it to /mnt/data/Virtual_Machines/OS_XYZ/OS_XYZ.vmx
## and then running the following commands to create the symlinks:
## #ln -s /mnt/data/Virtual_Machines /mnt/data/Virtual\ Machines
## #ln -s /mnt/data/Virtual_Machines/OS_XYZ /mnt/data/Virtual\ Machines/OS\ XYZ
## #ln -s /mnt/data/Virtual_Machines/OS_XYZ/OS_XYZ.vmx /mnt/data/Virtual\ Machines/OS\ XYZ/OS\ XYZ.vmx
## (This is also untested ;p)
##
## Warning: It's now possible to have duplicate backup directories for VMs
## with the same directory names. This will result in backups being
## overwritten. This is an outstanding bug yet to be fixed most likely by
## changing the directory naming method.
##
## Thanks to Gerald Anderson (aka Left Bain/Hardaur) for the initial hard work!
##

BACKUP_DEST=/home/backups/destination
VMWARE_CMD=/usr/bin/vmware-cmd
DEBUG=true
DAYS_TO_KEEP_TAR=6
BACKUP_ACTIVE_ONLY=true
MODE=suspend
REMOTE_ARCHIVES=false
CLEAN_REMOTE_ARCHIVES=false
REMOTE_ARCHIVE_URL=rsync.mydomain.com::backup/vmback

#Variables added in order to encryipt the backup, load it to a FTP server and get a report by email.
#This new code encrypt the backup file obtained from the original script, upload it to the FTP server and get
#a report of the whole trhought email
GPG="/usr/bin/gpg" #Where is your Gnupg program?
TAR="/bin/tar" #Where is your tar program?
MAILC="/usr/bin/mail" #Where is your Mail program?
NCFTP="/usr/bin/ncftpput" #Where is your NCFTP program?
MTO="yourmail@here.com" #What is your email?

MSUB="Backup $(hostname) report" #Write you email Subject
GPGU="myGnuPGkeyID" #What is your GnuGP ID for your key?

FTPD="VMbackup/" #What is your FTP directory to put your files?
FTPH="ftp.myftpserver.com" #What is your FTP server
FTPU="myusername tolog to theserver" #What is your FTP username
FTPP="thepasswordtologtotheftpserver" #What is your FTP password?

TMPD="$BACKUP_DEST/archives" #Where is the files to encrypt and upload?

## Include any VMs in this array that you do NOT want backed up. Use
## the directory name. For example: If your vm is in a directory called
## web0 then put 'web0' in the list. Separate with spaces.
EXEMPTION_ARRAY=( )

###########################################################################
## DO NOT EDIT BELOW
###########################################################################

##
## Create the backup directories if they do not exist
##
function doCheckDirectories
{
## if BACKUP_DEST does not exist, create it
if [ ! -d $BACKUP_DEST ]; then

if [ "$DEBUG" = "true" ]; then
echo $BACKUP_DEST does not exist, creating.
fi

mkdir $BACKUP_DEST
fi

## if the archives directory does not exist, create it
if [ ! -d $BACKUP_DEST/archives ]; then

if [ "$DEBUG" = "true" ]; then
echo $BACKUP_DEST/archives does not exist, creating.
fi

mkdir $BACKUP_DEST/archives
fi

## if the directories directory does not exist, create it
if [ ! -d $BACKUP_DEST/directories ]; then

if [ "$DEBUG" = "true" ]; then
echo $BACKUP_DEST/directories does not exist, creating.
fi

mkdir $BACKUP_DEST/directories

fi
}

##
## If this VM is in our exempt array, set VM_EXEMPT to skip entirely.
##
function doCheckExempt
{
# iterate throught the array, if we get a match, set
# VM_EXEMPT to true
for check_vm in ${EXEMPTION_ARRAY[@]}; do

if [ "$check_vm" = "$directoryName" ]; then

if [ "$DEBUG" = "true" ]; then
echo $vm is on the exception list, skipping.
fi

VM_EXEMPT=true
fi
done
}

##
## Set the displayName from the vmx file
##
function setDisplayName
{
# get the line from the file
displayLine=`grep displayName "$1"`

# get the quoted name from it
quotedName=${displayLine#*=}

# and get rid of the quotes and spaces
displayName=${quotedName//[\" ]/} #" <- for syntax highlighting

if [ "$DEBUG" = "true" ]; then
echo $vm displayName is $displayName
fi
}

##
## Set the directoryName from the path
##
function setDirectoryName
{
# remove traling / and filename
directoryPath=${vm%/*}

# remove the begining of the path
directoryName=${directoryPath##*/}

if [ "$DEBUG" = "true" ]; then
echo $vm directoryName is $directoryName
fi
}

##
## suspend a VM if its running, skip it if not
##
function suspendVM
{
# get the current VM state
vmstate=`$VMWARE_CMD -q "$vm" getstate`

if [ "$DEBUG" = "true" ]; then
echo $displayName state is currently: $vmstate
fi

# if its running, suspend it, otherwise, move on.
if [ "$vmstate" = "on" ]; then

if [ "$DEBUG" = "true" ]; then
echo suspending $displayName - MODE=$MODE . . .
fi

# make sure it actually suspends
if [ `$VMWARE_CMD -q "$vm" $MODE hard` == 1 ]; then

# track if it was running, so I can restart or not
VM_WAS_RUNNING=true

if [ "$DEBUG" = "true" ]; then
echo $displayName Suspended at `date '+%F %T'`
fi

return
else
echo $vm DID NOT SUSPEND!! Exiting Program.
exit 0
fi
else
if [ "$DEBUG" = "true" ]; then
echo $displayName was not originally active, no need to restart
fi
fi
}

##
## backup the VM
##
function doBackup
{
# synchronise (update) all data to the directories tree
if [ "$DEBUG" = "true" ]; then
echo Backing up $displayName to $BACKUP_DEST/directories/$directoryName
rsync -vax --progress --numeric-ids --delete "$directoryPath" "$BACKUP_DEST/directories/$directoryName"
else
rsync -ax --numeric-ids --delete "$directoryPath" "$BACKUP_DEST/directories/$directoryName"
fi
}

##
## Resume the VM if it was running in the first place
##
function resumeVM
{
if [ "$VM_WAS_RUNNING" = "true" ]; then
if [ "$DEBUG" = "true" ]; then
echo Resuming $displayName at `date '+%F %T'`
fi

if [ `$VMWARE_CMD -q "$vm" start` == 1 ]; then

if [ "$DEBUG" = "true" ]; then
echo $displayName restarted
fi
else
echo $vm FAILED TO RESUME!! NOT Exiting Program.
#exit 0
fi

else
if [ "$DEBUG" = "true" ]; then
echo $displayName wasnt running in the first place, not resuming.
fi
fi
}

##
## tgz up the directory for a more compressed and mobile backup.
##
function doTar
{

fileName=backup_$displayName'_'`/bin/date +%d-%m-%Y_%H-%M-%S`.tgz

if [ "$DEBUG" = "true" ]; then
echo taring up $displayName to $fileName
$TAR -cvPpszf "$BACKUP_DEST/archives/$fileName" "$BACKUP_DEST/directories/$directoryName"
else
$TAR -cpPszf "$BACKUP_DEST/archives/$fileName" "$BACKUP_DEST/directories/$directoryName"
fi

}

##
## Clean up any tars that are older than DAYS_TO_KEEP_TAR
##
function doCleanTar
{
if [ "$DEBUG" = "true" ]; then
echo Cleaning up tars older than $DAYS_TO_KEEP_TAR
find "$BACKUP_DEST/archives" -name "backup_$displayName*.tgz" -ctime +$DAYS_TO_KEEP_TAR -exec rm -vf {} \;
else
find "$BACKUP_DEST/archives" -name "backup_$displayName*.tgz" -ctime +$DAYS_TO_KEEP_TAR -exec rm -vf {} \;
fi
}

##
## Copy my archives to a remote host via rsync
##
function doRemoteArchives
{
if [ "$DEBUG" = "true" ]; then
echo Copying archives to remote location.
if [ "$CLEAN_REMOTE_ARCHIVES" = "true" ]; then
rsync -vaxz --progress --stats --numeric-ids --delete "$BACKUP_DEST/archives/" "$REMOTE_ARCHIVE_URL"
else
rsync -vaxz --progress --stats --numeric-ids "$BACKUP_DEST/archives/" "$REMOTE_ARCHIVE_URL"
fi
else
if [ "$CLEAN_REMOTE_ARCHIVES" = "true" ]; then
rsync -axz --numeric-ids --delete "$BACKUP_DEST/archives/" "$REMOTE_ARCHIVE_URL"
else
rsync -axz --numeric-ids "$BACKUP_DEST/archives/" "$REMOTE_ARCHIVE_URL"
fi
fi
}

##
## Main Loop, iterate through the VMs and handle them apprpriately
##

# make sure we have the appropriate directories for backups
doCheckDirectories

#for vm_noncanon in $(vmware-cmd -l); do
$VMWARE_CMD -l | while read file; do

#This one line below is necessary to treat vm_noncanon as one string instead of multiple
vm_noncanon=$file

#Get the canonical path to the Virtual Machine (remove any symlinks)
vm=`readlink -f "$vm_noncanon"`

# reset variables for this VM
VM_WAS_RUNNING=false
VM_EXEMPT=false

if [ "$DEBUG" = "true" ]; then
echo ooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo
echo Current VM is $vm
fi

# get my display and directory names, for use in tar name, etc.
setDisplayName "$vm"
setDirectoryName "$vm"

# check to see if current vm should be exempted
doCheckExempt

# only back up if it is not on the exempt list
if [ "$VM_EXEMPT" = "false" ]; then

# suspend my VM if its running
suspendVM

if [ "$BACKUP_ACTIVE_ONLY" = "false" ] || [ "$VM_WAS_RUNNING" = "true" ]; then
# actually do the directory backup
doBackup

# resume the VM if it was running to begin with
resumeVM

##########################
####New code added########
##########################

if [ ! -x $TAR ]; then
echo "$TAR command not found, contact $ADMIN_INFO"
exit 1
fi

if [ ! -x $NCFTP ]; then
echo "$NCFTP command not found, contact $ADMIN_INFO"
exit 1
fi

if [ ! -x $GPG ] ; then
echo "$GPG command not found, contact $ADMIN_INFO"
exit 1
fi

# tar it up
doTar

##########################
####New code added########
##########################
OUT="$TMPD/$fileName"
FOUT="$OUT.gpg"
MFILE="/tmp/ftpout.$$.txt"
MESS=""

if [ $? -ne 0 ];
then
MESS="$TAR failed to create backup. Nothing uploaded to remote FTP $FTPH server"
else
# Encrypt the .tar.gz file before upload
$GPG -e -r $GPGU -o $FOUT $OUT
$NCFTP -m -u "$FTPU" -p "$FTPP" "$FTPH" "$FTPD" "$FOUT"
OSTAT="$?"
case $OSTAT in
0) MESS="Success.";;
1) MESS="Could not connect to remote host $FTPH.";;
2) MESS="Could not connect to remote host $FTPH - timed out.";;
3) MESS="Transfer failed.";;
4) MESS="Transfer failed - timed out.";;
5) MESS="Directory change failed.";;
6) MESS="Directory change failed - timed out.";;
7) MESS="Malformed URL.";;
8) MESS="Usage error. May be your version of ncftpput ($NCFTP) is old";;
9) MESS="Error in login configuration file.";;
10)MESS="Library initialization failed.";;
11) MESS="Session initialization failed.";;
*) MESS="Unknown error, contact admin $ADMIN_INFO";;
esac
fi

>$MFILE
echo "Backup status for $(hostname) as on $(date):" >>$MFILE
echo "" >>$MFILE
echo "Backup File : $FOUT" >>$MFILE
echo "Backup ftp server : $FTPH" >>$MFILE
echo "Backup status message : $MESS" >>$MFILE
echo "" >>$MFILE
echo "-- Automatically generated by $(basename $0)" >>$MFILE

# send an email to admin
$MAILC -s "$MSUB" $MTO <$MFILE # remove the files: you can comment the bellow lines with '#' at your convenience [ -f $MFILE ] && rm -f $MFILE || : #[ -f $FOUT ] && rm -f $FOUT || : #[ -f $OUT ] && rm -f $OUT || : # and finally, clean up my old tars doCleanTar fi fi done if [ "$REMOTE_ARCHIVES" = "true" ]; then doRemoteArchives fi

Copia de seguridad

2008-07-04T15:35:00.000-07:00

Cuando pienses en establecer un sistema de backup / respaldo / copia de seguridad la máxima a seguir es:
SI ALGO PUEDE SALIR MAL, SALDRÁ

Recomiendo hacer dos tipos de backup diferenciados:
-Backup del sistema: busca la reposición rápida de tu sistema si algo ocurre
-Backup de los datos de interés: busca tener tus datos respaldados de la forma más 'reciente' posible

-Backup del sistema
Tres copias:
a) Para una copia rápida y una recuperación igual de rápida usar un simple tar: especialmente útil si restauramos en el mismo tipo de software. Esta copia se guardará en:
/home/backups/backupDelSistema
Servidor remoto de FTP con la copia convenientemente encriptada: /remoteftp/backupDelSistema

¿Pero qué pasa si nuestro server se rompe completamente y debemos adquirir uno nuevo con nuevo hardware? En ese caso el sistema a) no es recomendable y debemos de recurrir a:

b) Reinstalación del sistema operativo de nuevo y buscar una manera rápida de reinstalar los programas y la configuración de los mismos de la forma más automatizada posible. Usaremos el comando dpkg --get-selections para clonar tu servidor a otro nuevo. Se guardará en:
/home/backups/pqtesinstalados (contiene los ficheros obtenidos despues de ejecutarel get-selections)
Servidor remoto de FTP con la copia convenientemente encriptada: /remoteftp/backupDelSistema (al hacer el tar de todo el sistema ya estamos copiando el directorio /home/backups/pqtesinstalados local)

c) Como medida adicional podemos clonar el disco/particiones con clonezilla o PartImage. No veo la forma de automatizar esto así que no sirve como medida única de backup. Además no protege ante el cambio de hardware. Hago este backup cada bimestre o algo parecido sólo como medida extra de seguridad (recuerda que si algo puede salir mal, saldra) :-) Guardamos en:
/home/backups/clonezilla
Servidor remoto de FTP con la copia convenientemente encriptada: /remoteftp/clonezilla

-Backup de los datos
Utilizar el tipo de copia de seguridad del tipo tar (ver punto 'a' anterior).
En mi servidor tengo maquinas virtuales encuitándose (VMware Server), para hacer copia de seguridad de las mismas recomiendo usar un script personalizado.

SIEMPRE QUE SUBAS DATOS IMPORTANTES A UN SERVIDOR FTP ENCRIPTALOS USANDO GNUPG

Fortalecimiento de tu sistema

2008-06-30T12:38:00.000-07:00

No permitas el acceso de 'root' por SSH
Puedes quitar la autentificación por password en SSH
Cambia el puerto por defecto SSH (el 22) a otro mayor que el puerto 1024
Usa port knocking para abrir tus puertos. Si usas Shorewall configuralo aqui.

Software a instalar para asegurar un servidor Linux

2008-06-30T11:43:00.001-07:00

Programas a instalar en tu sistema Linux para tener seguridad básica contra hackers:

Logcheck: analisis de logs (ejemplo de mensajes a ignorar)
Tripwire: comprovacion de variación de archivos
Rkhunter: rootkit detection
chkrootkit: rootkit detection
bastille linux: hardening automatico
tiger: auditoria y deteccion de intrusos
portsentry: proteccion contra escaneo de puertos
apticron: recibe por email avisos de nuevas actualizaciones de un linux basado en Debian
Shorewall: un buen firewall para manejar tu iptables. Mas...
fail2ban: para mantener a raya los intentos de loggin por fuerza bruta

Administracion en Linux

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