Políticas del Tripwire

# tripwire policy file

@@section GLOBAL
TWROOT=/usr/sbin;
TWBIN=/usr/sbin;
TWPOL=”/etc/tripwire”;
TWDB=”/var/lib/tripwire”;
TWSKEY=”/etc/tripwire”;
TWLKEY=”/etc/tripwire”;
TWREPORT=”/var/lib/tripwire/report”;
HOSTNAME=ubuntuSRV.infosecsapobla.local;

# Define variables for policy classifications
@@section FS
SEC_CRIT = $(IgnoreNone)-SHa ; # Critical files that cannot change
SEC_SUID = $(IgnoreNone)-SHa ; # Binaries with the SUID or SGID flags set
SEC_BIN = $(ReadOnly) ; # Binaries that should not change
SEC_CONFIG = $(Dynamic) ; # Config files that are changed infrequently but accessed often
SEC_LOG = $(Growing) ; # Files that grow, but that should never change ownership
SEC_INVARIANT = +tpug ; # Directories that should never change permission or ownership
SIG_LOW = 33 ; # Non-critical files that are of minimal security impact
SIG_MED = 66 ; # Non-critical files that are of significant security impact
SIG_HI = 100 ; # Critical files that are significant points of vulnerability@@section FS

# Protect tripwire itself. The binaries and config files should not normally
# change. The database is read often but seldom changes. The inode
# is removed because backup files are created.

(
rulename = “Tripwire Binaries”,
severity = $(SIG_HI), emailto = adminstradror@ubuntuSRV.infosecsapobla.local
)
{
$(TWBIN)/siggen -> $(SEC_BIN) ;
$(TWBIN)/tripwire -> $(SEC_BIN) ;
$(TWBIN)/twadmin -> $(SEC_BIN) ;
$(TWBIN)/twprint -> $(SEC_BIN) ;
}

(
rulename = “Tripwire Data Files”,
severity = $(SIG_HI), emailto = adminstradror@ubuntuSRV.infosecsapobla.local
)
{

$(TWDB) -> $(SEC_CONFIG) -i ;
$(TWPOL)/tw.pol -> $(SEC_BIN) -i ;
$(TWPOL)/tw.cfg -> $(SEC_BIN) -i ;
$(TWLKEY)/$(HOSTNAME)-local.key -> $(SEC_BIN) ;
$(TWSKEY)/site.key -> $(SEC_BIN) ;

$(TWREPORT) -> $(SEC_CONFIG) (recurse=0);

# Directories that shouldn’t change.

(
rulename = “Invariant Directories”,
severity = $(SIG_MED)
)
{
/ -> $(SEC_INVARIANT) (recurse = 0) ;
/home -> $(SEC_INVARIANT) (recurse = 0) ;
/etc -> $(SEC_INVARIANT) (recurse = 0) ;
/var/www -> $(SEC_INVARIANT) (recurse = 0) ;
}

# Programs that normally wouldn’t change.
(
rulename = “File System and Disk Administraton Programs”,
severity = $(SIG_HI), emailto = adminstradror@ubuntuSRV.infosecsapobla.local
)
{
/sbin/accton -> $(SEC_CRIT) ;
/sbin/badblocks -> $(SEC_CRIT) ;
/sbin/dosfsck -> $(SEC_CRIT) ;
/sbin/debugfs -> $(SEC_CRIT) ;
/sbin/debugreiserfs -> $(SEC_CRIT) ;
/sbin/dumpe2fs -> $(SEC_CRIT) ;
/bin/mktemp -> $(SEC_CRIT) ;
/bin/rm -> $(SEC_CRIT) ;
/bin/rmdir -> $(SEC_CRIT) ;
(
rulename = “Kernel Administration Programs”,
severity = $(SIG_HI), emailto = adminstradror@ubuntuSRV.infosecsapobla.local
)
{
/sbin/adjtimex -> $(SEC_CRIT) ;
/sbin/ctrlaltdel -> $(SEC_CRIT) ;
/sbin/depmod -> $(SEC_CRIT) ;
/sbin/modinfo -> $(SEC_CRIT) ;
/sbin/sysctl -> $(SEC_CRIT) ;
}

 

(
rulename = “Networking Programs”,
severity = $(SIG_HI), emailto = adminstradror@ubuntuSRV.infosecsapobla.local
)
{
/etc/sysconfig/network-scripts/ifdown -> $(SEC_CRIT) ;
/etc/sysconfig/network-scripts/ifdown-cipcb -> $(SEC_CRIT) ;
/etc/sysconfig/network-scripts/ifdown-ipv6 -> $(SEC_CRIT) ;
/sbin/ypbind -> $(SEC_CRIT) ;
/bin/ping -> $(SEC_CRIT) ;
}
(
rulename = “System Administration Programs”,
severity = $(SIG_HI), emailto = adminstradror@ubuntuSRV.infosecsapobla.local
)
{
/sbin/chkconfig -> $(SEC_CRIT) ;
/sbin/fuser -> $(SEC_CRIT) ;
/bin/pwd -> $(SEC_CRIT) ;
/bin/uname -> $(SEC_CRIT) ;
}
(
rulename = “Operating System Utilities”,
severity = $(SIG_HI), emailto = adminstradror@ubuntuSRV.infosecsapobla.local
)
{
/bin/arch -> $(SEC_CRIT) ;
/bin/ash -> $(SEC_CRIT) ;
/bin/cut -> $(SEC_CRIT) ;
/bin/date -> $(SEC_CRIT) ;
}
(
rulename = “Temporary directories”,
recurse = false,
severity = $(SIG_LOW)
)
{
/usr/tmp -> $(SEC_INVARIANT) ;
/var/tmp -> $(SEC_INVARIANT) ;
/tmp -> $(SEC_INVARIANT) ;
}

(
rulename = “User binaries”,
severity = $(SIG_HI), emailto = adminstradror@ubuntuSRV.infosecsapobla.local
)
{
/sbin -> $(SEC_BIN) (recurse = 1) ;
/usr/local/bin -> $(SEC_BIN) (recurse = 1) ;
/usr/sbin -> $(SEC_BIN) (recurse = 1) ;
/usr/bin -> $(SEC_BIN) (recurse = 1) ;
}

(
rulename = “Shell Binaries”,
severity = $(SIG_HI), emailto = adminstradror@ubuntuSRV.infosecsapobla.local
)
{
/bin/ksh -> $(SEC_BIN) ;
/bin/sh -> $(SEC_BIN) ;
/bin/bash -> $(SEC_BIN) ;
/bin/tcsh -> $(SEC_BIN) ;
}

# Control files directly related to security

(
rulename = “Security Control”,
severity = $(SIG_HI), emailto = adminstradror@ubuntuSRV.infosecsapobla.local
)
{
/etc/group -> $(SEC_CRIT) ;
/etc/security -> $(SEC_CRIT) ;
}
# Insure that the basic login scripts don’t change.

(
rulename = “Login Scripts”,
severity = $(SIG_HI), emailto = adminstradror@ubuntuSRV.infosecsapobla.local
)
{
/etc/csh.cshrc -> $(SEC_CONFIG) ;
/etc/csh.login -> $(SEC_CONFIG) ;
# /etc/tsh_profile -> $(SEC_CONFIG) ; #Uncomment when this file exists
/etc/profile -> $(SEC_CONFIG) ;
}

# Libraries

(
rulename = “Libraries”,
severity = $(SIG_MED)
)
{
/usr/lib -> $(SEC_BIN) ;
/usr/local/lib -> $(SEC_BIN) ;
}

# Watch for changes in the boot files.

(
rulename = “Critical system boot files”,
severity = $(SIG_HI), emailto = adminstradror@ubuntuSRV.infosecsapobla.local
)
{
/boot -> $(SEC_CRIT) ;
/sbin/devfsd -> $(SEC_CRIT) ;
/sbin/installkernel -> $(SEC_CRIT) ;
/sbin/lilo -> $(SEC_CRIT) ;
!/boot/System.map ;
!/boot/module-info ;

# other boot files may exist. Look for:
#/ufsboot -> $(SEC_CRIT) ;
}

(
rulename = “System boot changes”,
severity = $(SIG_HI)
)
{
!/var/run/ftp.pids-all ; # Comes and goes on reboot.
!/root/.enlightenment ;
/dev/log -> $(SEC_CONFIG) ;
/dev/cua0 -> $(SEC_CONFIG) ;
/dev/tty1 -> $(SEC_CONFIG) ; # tty devices
/dev/tty2 -> $(SEC_CONFIG) ; # tty devices
/dev/tty6 -> $(SEC_CONFIG) ;
/var/lock/subsys/smb -> $(SEC_CONFIG) ;
/var/lock/subsys/snmpd -> $(SEC_CONFIG) ;
/var/lock/subsys/sound -> $(SEC_CONFIG) ;
/var/lock/subsys/squid -> $(SEC_CONFIG) ;
}
(
rulename = “Root config files”,
severity = 100
)
{
/root -> $(SEC_CRIT) ; # Additions to /root
/root/mail -> $(SEC_CONFIG) ;
/root/Mail -> $(SEC_CONFIG) ;
/root/.xsession-errors -> $(SEC_CONFIG) ;
/root/.xauth -> $(SEC_CONFIG) ;
/root/.ICEauthority -> $(SEC_CONFIG) ;
}

 

(
rulename = “Critical configuration files”,
severity = $(SIG_HI), emailto = adminstradror@ubuntuSRV.infosecsapobla.local
)
{
/etc/conf.linuxconf -> $(SEC_BIN) ;
/etc/crontab -> $(SEC_BIN) ;
/etc/cron.hourly -> $(SEC_BIN) ;
/etc/cron.daily -> $(SEC_BIN) ;
/etc/cron.weekly -> $(SEC_BIN) ;
/etc/cron.monthly -> $(SEC_BIN) ;
/etc/default -> $(SEC_BIN) ;
/etc/fstab -> $(SEC_BIN) ;
/etc/exports -> $(SEC_BIN) ;
/etc/group- -> $(SEC_BIN) ; # changes should be infrequent
/etc/host.conf -> $(SEC_BIN) ;
/etc/hosts.allow -> $(SEC_BIN) ;
/etc/hosts.deny -> $(SEC_BIN) ;
/etc/httpd/conf -> $(SEC_BIN) ; # changes should be infrequent
/etc/protocols -> $(SEC_BIN) ;
/etc/services -> $(SEC_BIN) ;
/etc/rc.d/init.d -> $(SEC_BIN) ;
/etc/rc.d -> $(SEC_BIN) ;
/etc/mail.rc -> $(SEC_BIN) ;
/etc/modules.conf -> $(SEC_BIN) ;
/etc/motd -> $(SEC_BIN) ;
/etc/named.conf -> $(SEC_BIN) ;
/etc/passwd -> $(SEC_CONFIG) ;
/etc/passwd- -> $(SEC_CONFIG) ;
/etc/profile.d -> $(SEC_BIN) ;
/var/lib/nfs/rmtab -> $(SEC_BIN) ;
/usr/sbin/fixrmtab -> $(SEC_BIN) ;
/etc/rpc -> $(SEC_BIN) ;
/etc/sysconfig -> $(SEC_BIN) ;
/etc/samba/smb.conf -> $(SEC_CONFIG) ;
/etc/gettydefs -> $(SEC_BIN) ;
/etc/nsswitch.conf -> $(SEC_BIN) ;
/etc/yp.conf -> $(SEC_BIN) ;
/etc/hosts -> $(SEC_CONFIG) ;
/etc/xinetd.conf -> $(SEC_CONFIG) ;
/etc/inittab -> $(SEC_CONFIG) ;
/etc/resolv.conf -> $(SEC_CONFIG) ;
/etc/syslog.conf -> $(SEC_CONFIG) ;
}
(
rulename = “Critical devices”,
severity = $(SIG_HI), emailto = adminstradror@ubuntuSRV.infosecsapobla.local
recurse = false
)
{
/dev/kmem -> $(Device) ;
/dev/mem -> $(Device) ;
/dev/null -> $(Device) ;
/dev/zero -> $(Device) ;
/proc/devices -> $(Device) ;
/proc/net -> $(Device) ;
/proc/cmdline -> $(Device) ;
/proc/misc -> $(Device) ;
}
(
rulename = “OS executables and libraries”,
severity = $(SIG_HI), emailto = adminstradror@ubuntuSRV.infosecsapobla.local
)
{
/bin -> $(SEC_BIN) ;
/lib -> $(SEC_BIN) ;
}
################################################ #
# File System and Disk Administration Programs # #
################################################
(
rulename = “File System and Disk Administraton Programs”,
severity = $(SIG_HI), emailto = adminstradror@ubuntuSRV.infosecsapobla.local
)
{
/var/www -> $(SEC_CRIT) ;
/home/ -> $(SEC_CRIT) ;
/boot/ -> $(SEC_CRIT) ;
}

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