[Asterisk-Users] asterisk and iptables

leonimar cape leo_mac_ph at yahoo.com
Wed Mar 15 00:17:26 MST 2006 

Why don't you use shorewall for your firewall instead.
Works for me.

--- Andres Baravalle <andres.baravalle at gmail.com>
wrote:

> Hi,
> I have a problem with asterisks on Linux.
> 
> Looks like it is a iptables problem. My external
> client (eyebeam, on a
> different computer) cannot register to the asterisk
> server, but the
> asterisk server itself *looks* working.
> 
> If I dial one of the incoming phone numbers for the
> server, I can see
> the call arriving in Asterisk  (using asterisk -r).
> 
> I tried nmap on my server, and this is the result:
> 
> PORT      STATE    SERVICE
> 4569/tcp  filtered unknown
> 5036/tcp  filtered unknown
> 5060/tcp  closed   sip
> 10000/tcp filtered snet-sensor-mgmt
> 
> Seems bad to have 5060 closed, because it should be
> the port for sip
> comunications.
> 
> Other outputs:
> netstat -a | grep 5060
> udp        0      0 *:5060                      *:*
> 
> This is my iptables scripts:
> 
> set -e
> 
> echo 0 > /proc/sys/net/ipv4/ip_forward
> ([ -f /var/lock/subsys/ipchains ] &&
> /etc/init.d/ipchains stop)
> >/dev/null 2>&1 || true
> (rmmod ipchains) >/dev/null 2>&1 || true
> /sbin/iptables -F
> /sbin/iptables -X
> /sbin/iptables -Z
> /sbin/iptables -P INPUT DROP
> /sbin/iptables -A INPUT -m state --state
> ESTABLISHED,RELATED -j ACCEPT
> /sbin/iptables -A INPUT -p tcp ! --syn -j REJECT
> --reject-with tcp-reset
> /sbin/iptables -A INPUT -m state --state INVALID -j
> DROP
> /sbin/iptables -P OUTPUT DROP
> /sbin/iptables -A OUTPUT -m state --state
> ESTABLISHED,RELATED -j ACCEPT
> /sbin/iptables -A OUTPUT -p tcp ! --syn -j REJECT
> --reject-with tcp-reset
> /sbin/iptables -A OUTPUT -m state --state INVALID -j
> DROP
> /sbin/iptables -P FORWARD DROP
> /sbin/iptables -A FORWARD -m state --state
> ESTABLISHED,RELATED -j ACCEPT
> /sbin/iptables -A FORWARD -p tcp ! --syn -j REJECT
> --reject-with tcp-reset
> /sbin/iptables -A FORWARD -m state --state INVALID
> -j DROP
> /sbin/iptables -A INPUT -i lo -j ACCEPT
> /sbin/iptables -A OUTPUT -o lo -j ACCEPT
> /sbin/iptables -A FORWARD -i lo -o lo -j ACCEPT
> /sbin/iptables -t mangle -F
> /sbin/iptables -t mangle -X
> /sbin/iptables -t mangle -Z
> /sbin/iptables -t mangle -P PREROUTING ACCEPT
> /sbin/iptables -t mangle -P OUTPUT ACCEPT
> /sbin/iptables -t mangle -P INPUT ACCEPT
> /sbin/iptables -t mangle -P FORWARD ACCEPT
> /sbin/iptables -t mangle -P POSTROUTING ACCEPT
> /sbin/iptables -t nat -F
> /sbin/iptables -t nat -X
> /sbin/iptables -t nat -Z
> /sbin/iptables -t nat -P PREROUTING ACCEPT
> /sbin/iptables -t nat -P OUTPUT ACCEPT
> /sbin/iptables -t nat -P POSTROUTING ACCEPT
> 
> /sbin/iptables -A INPUT -p tcp --dport 783 -j ACCEPT
> /sbin/iptables -A INPUT -p tcp --dport 3000 -j
> ACCEPT
> 
> /sbin/iptables -A INPUT -p tcp --dport 443 -j ACCEPT
> 
> /sbin/iptables -A INPUT -p tcp --dport 2000 -j
> ACCEPT
> /sbin/iptables -A INPUT -p udp --dport 2727 -j
> ACCEPT
> /sbin/iptables -A INPUT -p udp --dport 4520 -j
> ACCEPT
> /sbin/iptables -A INPUT -p udp --dport 4569 -j
> ACCEPT
> /sbin/iptables -A INPUT -p tcp --dport 5060 -j
> ACCEPT
> /sbin/iptables -A INPUT -p udp --dport 5060 -j
> ACCEPT
> /sbin/iptables -A INPUT -p udp --dport 10000:20000
> -j ACCEPT
> 
> /sbin/iptables -A INPUT -p tcp --dport 23 -s
> [safeip] -j ACCEPT
> /sbin/iptables -A INPUT -p udp --dport 23 -s
> [safeip] -j ACCEPT
> 
> /sbin/iptables -A INPUT -p udp -s [safeip] -j ACCEPT
> /sbin/iptables -A INPUT -p tcp -s [safeip] -j ACCEPT
> 
> /sbin/iptables -A INPUT -p tcp --dport 8443 -j
> ACCEPT
> 
> /sbin/iptables -A INPUT -p tcp --dport 80 -j ACCEPT
> /sbin/iptables -A INPUT -p tcp --dport 443 -j ACCEPT
> 
> /sbin/iptables -A INPUT -p tcp --dport 21 -j DROP
> 
> /sbin/iptables -A INPUT -p tcp --dport 22 -j ACCEPT
> 
> /sbin/iptables -A INPUT -p tcp --dport 25 -j ACCEPT
> /sbin/iptables -A INPUT -p tcp --dport 465 -j ACCEPT
> 
> /sbin/iptables -A INPUT -p tcp --dport 110 -j ACCEPT
> /sbin/iptables -A INPUT -p tcp --dport 995 -j ACCEPT
> 
> /sbin/iptables -A INPUT -p tcp --dport 143 -j ACCEPT
> /sbin/iptables -A INPUT -p tcp --dport 993 -j ACCEPT
> 
> /sbin/iptables -A INPUT -p tcp --dport 106 -s
> 127.0.0.1 -j ACCEPT
> /sbin/iptables -A INPUT -p tcp --dport 106 -j DROP
> 
> /sbin/iptables -A INPUT -p tcp --dport 3306 -s
> 127.0.0.1 -j ACCEPT
> /sbin/iptables -A INPUT -p tcp --dport 3306 -j DROP
> 
> /sbin/iptables -A INPUT -p tcp --dport 5432 -s
> 127.0.0.1 -j ACCEPT
> /sbin/iptables -A INPUT -p tcp --dport 5432 -j DROP
> 
> /sbin/iptables -A INPUT -p tcp --dport 9008 -j DROP
> /sbin/iptables -A INPUT -p tcp --dport 9080 -j DROP
> 
> /sbin/iptables -A INPUT -p udp --dport 137 -j DROP
> /sbin/iptables -A INPUT -p udp --dport 138 -j DROP
> /sbin/iptables -A INPUT -p tcp --dport 139 -j DROP
> /sbin/iptables -A INPUT -p tcp --dport 445 -j DROP
> 
> /sbin/iptables -A INPUT -p udp --dport 1194 -j DROP
> 
> /sbin/iptables -A INPUT -p udp --dport 53 -j ACCEPT
> /sbin/iptables -A INPUT -p tcp --dport 53 -j ACCEPT
> 
> /sbin/iptables -A INPUT -p icmp --icmp-type 8/0 -j
> DROP
> 
> /sbin/iptables -A INPUT -j DROP
> 
> /sbin/iptables -A OUTPUT -p tcp --dport 783 -j
> ACCEPT
> /sbin/iptables -A OUTPUT -p tcp --dport 3000 -j
> ACCEPT
> 
> /sbin/iptables -A OUTPUT -p udp -d 86.132.220.168 -j
> ACCEPT
> /sbin/iptables -A OUTPUT -p tcp -d 86.132.220.168 -j
> ACCEPT
> 
> /sbin/iptables -A OUTPUT -p tcp --dport 80 -j ACCEPT
> 
> /sbin/iptables -A OUTPUT -j ACCEPT
> 
> /sbin/iptables -A FORWARD -p tcp --dport 5060 -j
> ACCEPT
> /sbin/iptables -A FORWARD -p udp --dport 5060 -j
> ACCEPT
> /sbin/iptables -A FORWARD -p udp --dport 10000:20000
> -j ACCEPT
> 
> /sbin/iptables -A FORWARD -j DROP
> 
> echo 1 > /proc/sys/net/ipv4/ip_forward
> echo 1 >
>
/usr/local/psa/var/modules/firewall/ip_forward.active
> chmod 644
>
/usr/local/psa/var/modules/firewall/ip_forward.active
> 
> Any suggestions?
> 
> Thanks in advance,
>    Andres
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