Re: IPTABLES - Can't redirect HTTPS traffic to external Squid

[Bolinhas André <andre.bolinhas@xxxxxxxxxxxxxx>]

Hi

Do you mean user this

iptables -t nat -I PREROUTING -s 192.168.60.90/32 -p tcp -m tcp --dport 443 -m comment --comment ArticaSquidTransparent -j DNAT --to-destination 172.31.0.1:25976

iptables -t nat -I PREROUTING -s 192.168.60.90/32 -p tcp -m tcp --dport 80 -m comment --comment ArticaSquidTransparent -j DNAT --to-destination 172.31.0.1:52406

Instead this

iptables -t nat -I PREROUTING -s 192.168.60.90/32 -p tcp -m tcp --dport 443 -m comment --comment ArticaSquidTransparent -j REDIRECT --to-ports 25976

iptables -t nat -I PREROUTING -s 192.168.60.90/32 -p tcp -m tcp --dport 80 -m comment --comment ArticaSquidTransparent -j REDIRECT --to-ports 52406

?

Do I also need some kind of

-m state --state NEW,ESTABLISHED,RELATED -j ACCEPT

?

Best regards

Sent from Nine

---

De: NgTech LTD <ngtech1ltd@xxxxxxxxx>
Enviado: terça-feira, 30 de julho de 2024 14:44
Para: Bolinhas André
Cc: squid-users@xxxxxxxxxxxxxxxxxxxxx
Assunto Re: IPTABLES - Can't redirect HTTPS traffic to external Squid

Hey,

The dnat rule should be done on the squid itsef.
You will need to re-route the relevant traffic over the ipsec tunnel to the squid ip.
It's possible to do that over ipip or gre tunnels.

Eliezer

בתאריך יום ג׳, 30 ביולי 2024, 15:41, מאת Bolinhas André ‏<andre.bolinhas@xxxxxxxxxxxxxx>:

I have a external proxy server connected by VPN (IPSEC) to my main branch, and i'm trying to redirect all users HTTP / HTTPS traffic to this proxy.

Scenario Users -> Gateway (Main Branch) -> IPSEC -> Squid Proxy (transparent mode)

In my Gateway (Main Branch) I have this test iptables rule, that is forwarding all the TPC / UDP traffic to the Proxy server.

iptables -t nat -I PREROUTING -s 192.168.60.90 -p tcp -j DNAT --to-destination 172.31.0.1
iptables -t nat -I PREROUTING -s 192.168.60.90 -p udp -j DNAT --to-destination 172.31.0.1

In Squidd Proxy server I have the followed rules

iptables -t nat -I PREROUTING -s 192.168.60.90/32 -p tcp -m tcp --dport 443 -m comment --comment ArticaSquidTransparent -j REDIRECT --to-ports 8081
iptables -t nat -I PREROUTING -s 192.168.60.90/32 -p tcp -m tcp --dport 80 -m comment --comment ArticaSquidTransparent -j REDIRECT --to-ports 8080

Everything is working correctly, HTTP traffic is ok, DNS are also working, the only exeption is the HTTPS traffic, I can see the HTTPS traffic inside the squid access.log but on client side I got a timeout

1722265740.867      1 192.168.60.90 TCP_TUNNEL/200 0 CONNECT cnn.com:443 - HIER_DIRECT/51.210.183.2:443 - mac="00:00:00:00:00:00" webfilterpolicy:%200%0D%0A exterr="-|-"

Anyone can help me to understant if I'm missing so iptable rule to handle the HTTPS traffic?

Sent from Nine

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