Hola Gente...
Bueno, tengo una red interna la cual hace nat para salir a internet y el
squid como proxy para la red interna...
Lo que yo quiero es BLOQUEAR para que no puedan usar el msn ni que
tampoco puedan acceder a hotmail ni a yahoo.com entre otros, o sea no
dejar que accedan a ver los correos por webmail...
Eso lo tengo que hacer por que los que trabajan aca hicieron entrar un
virus bajandose una de las cosas de hotmail (esos archivos
atacheados....) y tambien se quiere bloquear para que no puedan usar msn...
Que debo hacer? como bloqueo los puertos para el msn y tambien como hago
que el Squid me bloquee para que no me deje ver las paginas de hotmail.?
Aca va mi squid.conf y mi rc.iptables para que vean como lo tengo ahora..
Dicho sea de paso, por mas que fuerzo a que lo que sea https o sea
puerto 81 (hago el forward del puerto al squid) no logro que el squid me
procese las paginas https y me queda "dando vueltas" sin dejarmelas
ver.. por que puede ser?
-----------rc.iptables...
#!/bin/sh
#
# rc.firewall-2.4-stronger
FWVER=0.63s
# An example of a stronger IPTABLES firewall with IP Masquerade
# support for 2.4.x kernels.
#
# Log:
# 0.63s - Added support for the IRC module
# 0.62s - Initial version based upon the basic 2.4.x rc.firewall
echo -e "\nLoading STRONGER rc.firewall - version $FWVER..\n"
#Setting the EXTERNAL and INTERNAL interfaces for the network
#
# Each IP Masquerade network needs to have at least one
# external and one internal network. The external network
# is where the natting will occur and the internal network
# should preferably be addressed with a RFC1918 private address
# scheme.
#
# For this example, "eth0" is external and "eth1" is internal"
#
# NOTE: If this doesnt EXACTLY fit your configuration, you must
# change the EXTIF or INTIF variables above. For example:
#
# EXTIF="ppp0"
#
# if you are a modem user.
#
EXTIF="ppp0"
INTIF="eth0"
echo " External Interface: $EXTIF"
echo " Internal Interface: $INTIF"
echo " ---"
# Specify your Static IP address here or let the script take care of it
# for you.
#
# If you prefer to use STATIC addresses in your firewalls, un-# out the
# static example below and # out the dynamic line. If you don't care,
# just leave this section alone.
#
# If you have a DYNAMIC IP address, the ruleset already takes care of
# this for you. Please note that the different single and double quote
# characters and the script MATTER.
#
#
# DHCP users:
# -----------
# If you get your TCP/IP address via DHCP, **you will need ** to
enable the
# #ed out command below underneath the PPP section AND replace the word
# "eth0" with the name of your EXTERNAL Internet connection (ppp0, ippp0,
# etc) on the lines for "ppp-ip" and "extip". You should also note
that the
# DHCP server can and will change IP addresses on you. To deal with
this,
# users should configure their DHCP client to re-run the rc.firewall
ruleset
# everytime the DHCP lease is renewed.
#
# NOTE #1: Some DHCP clients like the original "pump" (the newer
# versions have been fixed) did NOT have the ability to run
# scripts after a lease-renew. Because of this, you need to
# replace it with something like "dhcpcd" or "dhclient".
#
# NOTE #2: The syntax for "dhcpcd" has changed in recent versions.
#
# Older versions used syntax like:
# dhcpcd -c /etc/rc.d/rc.firewall eth0
#
# Newer versions execute a file called
/etc/dhcpc/dhcpcd-eth0.exe
#
# NOTE #3: For Pump users, put the following line in /etc/pump.conf:
#
# script /etc/rc.d/rc.firewall
#
# PPP users:
# ----------
# If you aren't already aware, the /etc/ppp/ip-up script is always run
when
# a PPP connection comes up. Because of this, we can make the ruleset
go and
# get the new PPP IP address and update the strong firewall ruleset.
#
# If the /etc/ppp/ip-up file already exists, you should edit it and
add a line
# containing "/etc/rc.d/rc.firewall" near the end of the file.
#
# If you don't already have a /etc/ppp/ip-up sccript, you need to
create the
# following link to run the /etc/rc.d/rc.firewall script.
#
# ln -s /etc/rc.d/rc.firewall /etc/ppp/ip-up
#
# * You then want to enable the #ed out shell command below *
#
#
# Determine the external IP automatically:
# ----------------------------------------
#
EXTIP="`/sbin/ifconfig $EXTIF | grep 'inet addr' | awk '{print $2}' |
sed -e 's/.*://'`"
# For users who with to use STATIC IP addresses:
#
# # out the EXTIP line above and un-# out the EXTIP line below
#
#EXTIP="your.static.PPP.address"
echo " External IP: $EXTIP"
echo " ---"
# Assign the internal TCP/IP network and IP address
INTNET="192.168.0.0/24"
INTIP="192.168.0.2/24"
PORTFWIP="192.168.0.2"
echo " Internal Network: $INTNET"
echo " Internal IP: $INTIP"
echo " Apache LAN IP: $PORTFWIP"
echo " ---"
# The location of various iptables and other shell programs
#
# If your Linux distribution came with a copy of iptables, most
# likely it is located in /sbin. If you manually compiled
# iptables, the default location is in /usr/local/sbin
#
# ** Please use the "whereis iptables" command to figure out
# ** where your copy is and change the path below to reflect
# ** your setup
#
IPTABLES=/sbin/iptables
#IPTABLES=/usr/local/sbin/iptables
#
LSMOD=/sbin/lsmod
GREP=/bin/grep
AWK=/usr/bin/awk
# Setting a few other local variables
#
UNIVERSE="0.0.0.0/0"
#======================================================================
#== No editing beyond this line is required for initial MASQ testing ==
# Need to verify that all modules have all required dependencies
#
echo " - Verifying that all kernel modules are ok"
/sbin/depmod -a
echo -en " Loading kernel modules: "
# With the new IPTABLES code, the core MASQ functionality is now either
# modular or compiled into the kernel. This HOWTO shows ALL IPTABLES
# options as MODULES. If your kernel is compiled correctly, there is
# NO need to load the kernel modules manually.
#
# NOTE: The following items are listed ONLY for informational reasons.
# There is no reason to manual load these modules unless your
# kernel is either mis-configured or you intentionally disabled
# the kernel module autoloader.
#
# Upon the commands of starting up IP Masq on the server, the
# following kernel modules will be automatically loaded:
#
# NOTE: Only load the IP MASQ modules you need. All current IP MASQ
# modules are shown below but are commented out from loading.
# ===============================================================
#Load the main body of the IPTABLES module - "iptable"
# - Loaded automatically when the "iptables" command is invoked
#
# - Loaded manually to clean up kernel auto-loading timing issues
#
echo -en "ip_tables, "
#
#Verify the module isn't loaded. If it is, skip it
#
if [ -z "` $LSMOD | $GREP ip_tables | $AWK {'print $1'} `" ]; then
/sbin/insmod ip_tables
fi
#Load the IPTABLES filtering module - "iptable_filter"
#
# - Loaded automatically when filter policies are activated
#Load the stateful connection tracking framework - "ip_conntrack"
#
# The conntrack module in itself does nothing without other specific
# conntrack modules being loaded afterwards such as the "ip_conntrack_ftp"
# module
#
# - This module is loaded automatically when MASQ functionality is
# enabled
#
# - Loaded manually to clean up kernel auto-loading timing issues
#
echo -en "ip_conntrack, "
#
#Verify the module isn't loaded. If it is, skip it
#
if [ -z "` $LSMOD | $GREP ip_conntrack | $AWK {'print $1'} `" ]; then
/sbin/insmod ip_conntrack
fi
#Load the FTP tracking mechanism for full FTP tracking
#
# Enabled by default -- insert a "#" on the next line to deactivate
#
echo -e "ip_conntrack_ftp, "
#
#Verify the module isn't loaded. If it is, skip it
#
if [ -z "` $LSMOD | $GREP ip_conntrack_ftp | $AWK {'print $1'} `" ]; then
/sbin/insmod ip_conntrack_ftp
fi
#Load the IRC tracking mechanism for full IRC tracking
#
# Enabled by default -- insert a "#" on the next line to deactivate
#
echo -en " ip_conntrack_irc, "
#
#Verify the module isn't loaded. If it is, skip it
#
if [ -z "` $LSMOD | $GREP ip_conntrack_irc | $AWK {'print $1'} `" ]; then
/sbin/insmod ip_conntrack_irc
fi
#Load the general IPTABLES NAT code - "iptable_nat"
# - Loaded automatically when MASQ functionality is turned on
#
# - Loaded manually to clean up kernel auto-loading timing issues
#
echo -en "iptable_nat, "
#
#Verify the module isn't loaded. If it is, skip it
#
if [ -z "` $LSMOD | $GREP iptable_nat | $AWK {'print $1'} `" ]; then
/sbin/insmod iptable_nat
fi
#Loads the FTP NAT functionality into the core IPTABLES code
# Required to support non-PASV FTP.
#
# Enabled by default -- insert a "#" on the next line to deactivate
#
echo -e "ip_nat_ftp"
#
#Verify the module isn't loaded. If it is, skip it
#
if [ -z "` $LSMOD | $GREP ip_nat_ftp | $AWK {'print $1'} `" ]; then
/sbin/insmod ip_nat_ftp
fi
echo " ---"
# Just to be complete, here is a list of the remaining kernel modules
# and their function. Please note that several modules should be only
# loaded by the correct master kernel module for proper operation.
# --------------------------------------------------------------------
#
# ipt_mark - this target marks a given packet for future action.
# This automatically loads the ipt_MARK module
#
# ipt_tcpmss - this target allows to manipulate the TCP MSS
# option for braindead remote firewalls.
# This automatically loads the ipt_TCPMSS module
#
# ipt_limit - this target allows for packets to be limited to
# to many hits per sec/min/hr
#
# ipt_multiport - this match allows for targets within a range
# of port numbers vs. listing each port individually
#
# ipt_state - this match allows to catch packets with various
# IP and TCP flags set/unset
#
# ipt_unclean - this match allows to catch packets that have invalid
# IP/TCP flags set
#
# iptable_filter - this module allows for packets to be DROPped,
# REJECTed, or LOGged. This module automatically
# loads the following modules:
#
# ipt_LOG - this target allows for packets to be
# logged
#
# ipt_REJECT - this target DROPs the packet and returns
# a configurable ICMP packet back to the
# sender.
#
# iptable_mangle - this target allows for packets to be manipulated
# for things like the TCPMSS option, etc.
#CRITICAL: Enable IP forwarding since it is disabled by default since
#
# Redhat Users: you may try changing the options in
# /etc/sysconfig/network from:
#
# FORWARD_IPV4=false
# to
# FORWARD_IPV4=true
#
echo " Enabling forwarding.."
echo "1" > /proc/sys/net/ipv4/ip_forward
# Dynamic IP users:
#
# If you get your IP address dynamically from SLIP, PPP, or DHCP,
# enable this following option. This enables dynamic-address hacking
# which makes the life with Diald and similar programs much easier.
#
echo " Enabling DynamicAddr.."
echo "1" > /proc/sys/net/ipv4/ip_dynaddr
echo " ---"
#############################################################################
#
# Enable Stronger IP forwarding and Masquerading
#
# NOTE: In IPTABLES speak, IP Masquerading is a form of SourceNAT or SNAT.
#
# NOTE #2: The following is an example for an internal LAN address in the
# 192.168.0.x network with a 255.255.255.0 or a "24" bit subnet
# mask connecting to the Internet on external interface "eth0".
# This example will MASQ internal traffic out to the Internet
# not not allow non-initiated traffic into your internal network.
#
#
# ** Please change the above network numbers, subnet mask, and your
# *** Internet connection interface name to match your setup
#
#Clearing any previous configuration
#
# Unless specified, the defaults for INPUT, OUTPUT, and FORWARD to DROP.
#
# You CANNOT change this to REJECT as it isn't a vaild setting for a
# policy. If you want REJECT, you must explictly REJECT at the end
# of a giving INPUT, OUTPUT, or FORWARD chain
#
echo " Clearing any existing rules and setting default policy to DROP.."
$IPTABLES -P INPUT DROP
$IPTABLES -F INPUT
$IPTABLES -P OUTPUT DROP
$IPTABLES -F OUTPUT
$IPTABLES -P FORWARD DROP
$IPTABLES -F FORWARD
$IPTABLES -F -t nat
#Not needed and it will only load the unneeded kernel module
#$IPTABLES -F -t mangle
#
# Flush the user chain.. if it exists
if [ -n "`$IPTABLES -L | $GREP drop-and-log-it`" ]; then
$IPTABLES -F drop-and-log-it
fi
#
# Delete all User-specified chains
$IPTABLES -X
#
# Reset all IPTABLES counters
$IPTABLES -Z
#Configuring specific CHAINS for later use in the ruleset
#
# NOTE: Some users prefer to have their firewall silently
# "DROP" packets while others prefer to use "REJECT"
# to send ICMP error messages back to the remote
# machine. The default is "REJECT" but feel free to
# change this below.
#
# NOTE: Without the --log-level set to "info", every single
# firewall hit will goto ALL vtys. This is a very big
# pain.
#
echo " Creating a DROP chain.."
$IPTABLES -N drop-and-log-it
#$IPTABLES -A drop-and-log-it -j LOG --log-level 3
#$IPTABLES -A drop-and-log-it -j LOG
$IPTABLES -A drop-and-log-it -j DROP
echo -e "\n - Loading INPUT rulesets"
#######################################################################
# INPUT: Incoming traffic from various internfaces. All rulesets are
# already flushed and set to a default policy of DROP.
#
# loopback interfaces are valid.
#
$IPTABLES -A INPUT -i lo -s $UNIVERSE -d $UNIVERSE -j ACCEPT
# local interface, local machines, going anywhere is valid
#
$IPTABLES -A INPUT -i $INTIF -s $INTNET -d $UNIVERSE -j ACCEPT
# regla de entrada para la interfase del VMware (vmnet8)
#
#$IPTABLES -A INPUT -i vmnet8 -s 172.16.83.1/32 -d 172.16.83.1/24 -j ACCEPT
# regla en la intranet para permitir broadcast dhcp
#
$IPTABLES -A INPUT -i $INTIF -s $UNIVERSE -d 255.255.255.255/32 -j ACCEPT
# permito acceso a dhcp solo a PCs de la LAN
#
$IPTABLES -A INPUT -i $INTIF -s $UNIVERSE -d $INTNET -p udp --dport 67
-j ACCEPT
$IPTABLES -A INPUT -i $INTIF -s $UNIVERSE -d $INTNET -p udp --dport 68
-j ACCEPT
# permito acceso desde inet (sólo un host) via ftp (port 21)
#
#$IPTABLES -A INPUT -i $EXTIF -s $UNIVERSE -d $EXTIP -p tcp --dport 21
-j ACCEPT
# permito acceso desde inet via ssh (port 22)
#
$IPTABLES -A INPUT -i $EXTIF -s $UNIVERSE -d $EXTIP -p tcp --dport 22 -j
ACCEPT
# permito acceso desde inet a mi proxy (port 3128)
#
# $IPTABLES -A INPUT -i $EXTIF -s $UNIVERSE -d $EXTIP -p tcp --dport
3128 -j ACCEPT
# permito acceso desde inet a sendmail (port 25)
#
$IPTABLES -A INPUT -i $EXTIF -s $UNIVERSE -d $EXTIP -p tcp --dport 25 -j
ACCEPT
# permito acceso desde inet a clientes ICQ
#
#$IPTABLES -A INPUT -i $EXTIF -s $UNIVERSE -d $EXTIP -p tcp --dport
1075:1085 -j ACCEPT
#$IPTABLES -A INPUT -i $EXTIF -s $UNIVERSE -d $EXTIP -p tcp --dport
4000:4100 -j ACCEPT
# Permito acceso al port 24554 que creo es el binkd
# $IPTABLES -A INPUT -i $EXTIF -s $UNIVERSE -d $EXTIP -p tcp --dport
24554 -j ACCEPT
# permito acceso al port 4662 para eDonkey
# $IPTABLES -A INPUT -i $EXTIF -s $UNIVERSE -d $EXTIP -p tcp --dport
4661 -j ACCEPT
# $IPTABLES -A INPUT -i $EXTIF -s $UNIVERSE -d $EXTIP -p tcp --dport
4662 -j ACCEPT
# $IPTABLES -A INPUT -i $EXTIF -s $UNIVERSE -d $EXTIP -p udp --dport
4666 -j ACCEPT
# permito acceso desde inet al port 80
#
$IPTABLES -A INPUT -i $EXTIF -s $UNIVERSE -d $EXTIP -p tcp --dport 80 -j
ACCEPT
# $IPTABLES -A INPUT -i $EXTIF -s $UNIVERSE -d $EXTIP -p tcp --dport
3128 -j ACCEPT
# remote interface, claiming to be local machines, IP spoofing, get lost
#
$IPTABLES -A INPUT -i $EXTIF -s $INTNET -d $UNIVERSE -j drop-and-log-it
# external interface, from any source, for ICMP traffic is valid
#
# If you would like your machine to "ping" from the Internet,
# enable this next line
#
$IPTABLES -A INPUT -i $EXTIF -p ICMP -s $UNIVERSE -d $EXTIP -j ACCEPT
# remote interface, any source, going to permanent PPP address is valid
#
#$IPTABLES -A INPUT -i $EXTIF -s $UNIVERSE -d $EXTIP -j ACCEPT
# Allow any related traffic coming back to the MASQ serer in
#
$IPTABLES -A INPUT -i $EXTIF -s $UNIVERSE -d $EXTIP -m state --state \
ESTABLISHED,RELATED -j ACCEPT
# Catch all rule, all other incoming is denied and logged.
#
$IPTABLES -A INPUT -s $UNIVERSE -d $UNIVERSE -j drop-and-log-it
echo -e " - Loading OUTPUT rulesets"
#######################################################################
# OUTPUT: Outgoing traffic from various internfaces. All rulesets are
# already flushed and set to a default policy of DROP.
#
# loopback interface is valid.
#
$IPTABLES -A OUTPUT -o lo -s $UNIVERSE -d $UNIVERSE -j ACCEPT
# local interfaces, any source going to local net is valid
#
$IPTABLES -A OUTPUT -o $INTIF -s $EXTIP -d $INTNET -j ACCEPT
# local interface, any source going to local net is valid
#
$IPTABLES -A OUTPUT -o $INTIF -s $INTIP -d $INTNET -j ACCEPT
# regla de salida para la interfase del VMware (vmnet8)
#
# $IPTABLES -A OUTPUT -o vmnet8 -s 172.16.83.1/32 -d 172.16.83.1/24 -j
ACCEPT
# regla de salida para la interfase del VMware (vmnet8)
#
# $IPTABLES -A OUTPUT -o $INTIF -s $UNIVERSE -d 255.255.255.255/32 -j ACCEPT
# outgoing to local net on remote interface, stuffed routing, deny
#
$IPTABLES -A OUTPUT -o $EXTIF -s $UNIVERSE -d $INTNET -j drop-and-log-it
# anything else outgoing on remote interface is valid
#
$IPTABLES -A OUTPUT -o $EXTIF -s $EXTIP -d $UNIVERSE -j ACCEPT
# Catch all rule, all other outgoing is denied and logged.
#
$IPTABLES -A OUTPUT -s $UNIVERSE -d $UNIVERSE -j drop-and-log-it
echo -e " - Loading FORWARD rulesets"
#######################################################################
# FORWARD: Enable Forwarding and thus IPMASQ
#
echo " - FWD: Allow all connections OUT and only existing/related IN"
$IPTABLES -A FORWARD -i $EXTIF -o $INTIF -m state --state
ESTABLISHED,RELATED \
-j ACCEPT
$IPTABLES -A FORWARD -i $INTIF -o $EXTIF -j ACCEPT
# Port forward del port 80 hacia una máquina de la LAN:
# $IPTABLES -A FORWARD -i $EXTIF -o $INTIF -p tcp --dport 80 -m state \
# --state NEW,ESTABLISHED,RELATED -j ACCEPT
# $IPTABLES -A PREROUTING -t nat -p tcp -d $EXTIP --dport 80 \
# -j DNAT --to $PORTFWIP:80
# Proxy Transparente con Squid - Puerto 80
$IPTABLES -t nat -A PREROUTING -i eth0 -p tcp --dport 80 \
-j REDIRECT --to-port 3128
# Proxy Transparente con Squid - Puerto ftp
# $IPTABLES -t nat -A PREROUTING -i eth0 -p tcp --dport 21 \
# -j REDIRECT --to-port 3128
$IPTABLES -A FORWARD -j drop-and-log-it
echo " - NAT: Enabling SNAT (MASQUERADE) functionality on $EXTIF"
#
#More liberal form
#$IPTABLES -t nat -A POSTROUTING -o $EXTIF -j MASQUERADE
#
#Habilitar esta linea para nat a TODOS
# $IPTABLES -t nat -A POSTROUTING -o $EXTIF -j SNAT --to $EXTIP
#Pc de Ariel
$IPTABLES -t nat -A POSTROUTING -s 192.168.0.10 -o $EXTIF -j SNAT --to
$EXTIP
#Pc de Pato
$IPTABLES -t nat -A POSTROUTING -s 192.168.0.12 -o $EXTIF -j SNAT --to
$EXTIP
#Pc de Gaston
#$IPTABLES -t nat -A POSTROUTING -s 192.168.0.15 -o $EXTIF -j SNAT --to
$EXTIP
#Pc de Emilio
#$IPTABLES -t nat -A POSTROUTING -s 192.168.0.18 -o $EXTIF -j SNAT --to
$EXTIP
#######################################################################
echo -e "\nDone.\n"
--------------squid.conf
http_port 3128
icp_port 3130
#We recommend you to use at least the following line.
hierarchy_stoplist cgi-bin ?
#We recommend you to use the following two lines.
acl QUERY urlpath_regex cgi-bin \?
no_cache deny QUERY
cache_mem 16 MB
cache_dir ufs /var/spool/squid 3000 16 256
reference_age 1 week
#Recommended minimum configuration:
acl manager proto cache_object
acl localhost src 127.0.0.1/255.255.255.255
acl all src 0.0.0.0/0.0.0.0
# acl allowed_hosts src 192.168.0.0-192.168.0.115/255.255.255.255
acl lansrv src 192.168.0.1-192.168.0.5/255.255.255.255
acl lansc src 192.168.0.10-192.168.0.12/255.255.255.255
192.168.0.15-192.168.0.16/255.255.255.255
acl lancc src 192.168.0.109/255.255.255.255
192.168.0.17-192.168.0.19/255.255.255.255
acl lansi src 192.168.0.20-192.168.0.108/255.255.255.255
192.168.0.110-192.168.0.255/255.255.255.255
# Control maximo
# acl 2conn maxconn 2
# http_access deny 2conn nono
# Baja velocidad por IP (Para grupo mio)
delay_pools 2
delay_class 1 2
delay_class 2 2
# delay_parameters 1 -1/-1 1000/1000 1000/1000 500/500 500/500
delay_parameters 1 5500/5500 3000/3000 1500/1500 1000/1000
delay_parameters 2 1000/1000 1000/1000 500/500 500/500
delay_access 1 allow lansc
delay_access 1 deny all
delay_access 2 allow lancc
delay_access 2 deny all
# acl desdeafuera src 0.0.0.0
# http_access allow desdeafuera
acl SSL_ports port 443 563
acl Safe_ports port 80 # http
acl Safe_ports port 21 # ftp
acl Safe_ports port 443 563 # https, snews
acl Safe_ports port 70 # gopher
acl Safe_ports port 210 # wais
acl Safe_ports port 1025-65535 # unregistered ports
acl Safe_ports port 280 # http-mgmt
acl Safe_ports port 488 # gss-http
acl Safe_ports port 591 # filemaker
acl Safe_ports port 777 # multiling http
acl Safe_ports port 10000 # Webmin
acl CONNECT method CONNECT
# Only allow cachemgr access from localhost
http_access allow manager localhost
http_access deny manager
# Deny requests to unknown ports
http_access deny !Safe_ports
# Deny CONNECT to other than SSL ports
http_access deny CONNECT !SSL_ports
http_access allow localhost
http_access allow lansrv
http_access deny all lansi
icp_access allow all
icp_access allow lansrv lansc
icp_access deny all lansi
# -------------------
cache_mgr root
httpd_accel_host virtual
httpd_accel_port 80
httpd_accel_with_proxy on
httpd_accel_uses_host_header on
----------- fin
