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Basic Security Module (BSM)

Para configurar la auditoria a nivel C2 de Solaris es necesario habilitar el  módulo  de  seguridad  básica  o  BSM  (Basic  Security  Module). 

1.  Asegurarse  de  que  aún  no  se  encuentra  habilitado  BSM  (el siguiente comando no debe devolver ninguna salida): grep c2audit /etc/system

2.  Habilitar BSM:
/etc/security/bsmconv
This script is used to enable the Basic Security Module (BSM).
Shall we continue with the conversion now? [y/n] y
bsmconv: INFO: checking startup file. bsmconv: INFO: move aside /etc/rc3.d/S81volmgt. bsmconv: INFO: turning on audit module. bsmconv: INFO: initializing device allocation files. The Basic Security Module is ready. If there were any errors, please fix them now. Configure BSM by editing files located in /etc/security. Reboot this system now to come up with BSM enabled.

3.  Revisar que se haya creado el directorio /var/audit:
ls -ld /var/audit
drwxr-xr-x   2 root      sys           512 Jul 12 22:23 /var/audit
ls -l /var/audit
total 2
-rw-------            1    root                    root                                        56    Jul    12    22:23
20050713032312.not_terminated.hostname

4.  Configurar   en   el   archivo   /etc/security/audit_control   las siguientes clases de eventos a ser auditadas:
# vi /etc/security/audit_control
dir:/var/audit flags:lo,ad naflags:lo,ad # #    lo - login/logout events #    ad - administrative actions: mount, exportfs, etc. #    pc - process operations: fork, exec, exit, etc. #    fc - file creation #    fd - file deletion #    fm - change of object attributes: chown, flock, etc

5.  Crear el script /etc/security/newauditlog.sh:
vi /etc/security/newauditlog.sh

#!/sbin/sh

#
# newauditlog.sh - Start a new audit file and expire the old logs

PATH=/usr/bin:/usr/sbin
#
# If the disk space isn't sufficient to retain logs on a month, # lower
this value from 30 to 7

AUDIT_EXPIRE=30 

AUDIT_DIR="/var/audit"

LOG_DIR=/var/audit/logs
# Rotate the log file audit -n

# Move the log files to the archive directory and compress

for i in `ls ${AUDIT_DIR} | grep -v not_terminated | grep -v logs`
do
compress ${AUDIT_DIR}/${i}
mv ${AUDIT_DIR}/${i}.Z ${LOG_DIR}/${i}.Z
done

# Delete old log files

cd ${AUDIT_DIR} # in case it is a link
find . ${LOG_DIR} -type f -mtime +${AUDIT_EXPIRE} \
-exec rm {} > /dev/null 2>&1 \;
exit 0

chmod 500 /etc/security/newauditlog.sh
6.  Configurar la siguiente línea de crontab para el usuario root:
0 0 * * * /etc/security/newauditlog.sh

7.  Reiniciar el sistema:
/usr/sbin/shutdown -y -g 0 -i 6

8.  Los  archivos  de  auditoria  generados  pueden  ser  leídos  con  el comando praudit

Regresar


Random TIPS


Como convertir id_rsa keys OpenSSH a Putty .ppk sin passphrase.

La llave publica y privada id_rsa fue generada en SO UNIX/Linux, sin una passphrase.

Para poder usarla con Putty en Windows es necesario importar la llave privada con PuttyGen y guardarla como .ppk.

En putty:
Click en Conversions => Import Key Click en Save Private Key y Yes para salvar sin una passphrase.
Resguardar la nueva key.ppk en una directorio seguro para evitar que sea eliminada.
Ir a Putty en Connection => SSH => Auth y agregar en Private Key file for authentication.

Validar conectividad con llave privada.

login as: connect01
This computing system is a company owned asset and provided for the exclusive use of authorized 
personnel for business purposes. All information and data created, accessed, processed, or stored
using this system (including personal information) are subject to monitoring, auditing, or review to
the extent permitted by applicable law. Unauthorized use or abuse of this system may lead to
corrective action including termination of employment, civil and/or criminal penalties. Authenticating with public key "imported-openssh-key"

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