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Special Forums IP Networking Proxy Server iptables as "proxy" and a filter Post 302926601 by tschulian on Tuesday 25th of November 2014 12:07:03 PM
Old 11-25-2014
iptables as "proxy" and a filter

Dear community,
since I am a german guy, excuse gramatical mistakes.

I create a proxy to hide my application servers public IP from my customers.
I am actually using those 3 lines
(for testing reasons I am forwarding the traffic which connects to the ubuntu proxy to my apache webserver (5.196.130.245:80)

Code:
echo 1 > /proc/sys/net/ipv4/ip_forward
iptables -t nat -A PREROUTING -p tcp --dport 80 -j DNAT --to-destination 5.196.130.245:80
iptables -t nat -A POSTROUTING -j MASQUERADE

I show this to a friend/competitor and he said, lol, with this code ur "hiding" the costumers IP in ur Database logs
(for example, they use the register formular on the website username, password registerIP - and with my 3 lines of code the register IP is the proxys IP in every single case but he told me he got a way to see even the real Users IP, even if they connecting through the proxy)

So he sent me the following Picture of his script
Image

Any1 knows / is able to describe me what he has done better / other than me? I cannot see any routing cmds in his script.

I'm now almost searching 5 days for a solution and this is my last hope to find it.


EDIT: okay, I just found out that this Script for setting up the iptables is not for forwarding any traffic.
For the redirecting/forwarding part he is using HAPROXY.

regards,
Julian

Last edited by tschulian; 11-25-2014 at 04:13 PM.. Reason: code tags not icode ... thanks
 

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CURLOPT_PRE_PROXY(3)					     curl_easy_setopt options					      CURLOPT_PRE_PROXY(3)

NAME
CURLOPT_PRE_PROXY - set pre-proxy to use SYNOPSIS
#include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PRE_PROXY, char *preproxy); DESCRIPTION
Set the preproxy to use for the upcoming request. The parameter should be a char * to a zero terminated string holding the host name or dotted numerical IP address. A numerical IPv6 address must be written within [brackets]. To specify port number in this string, append :[port] to the end of the host name. The proxy's port number may optionally be specified with the separate option CURLOPT_PROXYPORT(3). If not specified, libcurl will default to using port 1080 for proxies. A pre proxy is a SOCKS proxy that curl connects to before it connects to the HTTP(S) proxy specified in the CURLOPT_PROXY option. The pre proxy can only be a SOCKS proxy. The pre proxy string should be prefixed with [scheme]:// to specify which kind of socks is used. Use socks4://, socks4a://, socks5:// or socks5h:// (the last one to enable socks5 and asking the proxy to do the resolving, also known as CURLPROXY_SOCKS5_HOSTNAME type) to request the specific SOCKS version to be used. Otherwise SOCKS4 is used as default. Setting the pre proxy string to "" (an empty string) will explicitly disable the use of a pre proxy. The application does not have to keep the string around after setting this option. DEFAULT
Default is NULL, meaning no pre proxy is used. When you set a host name to use, do not assume that there's any particular single port number used widely for proxies. Specify it! PROTOCOLS
All except file://. Note that some protocols don't do very well over proxy. EXAMPLE
TODO AVAILABILITY
Added in 7.52.0 RETURN VALUE
Returns CURLE_OK if proxies are supported, CURLE_UNKNOWN_OPTION if not, or CURLE_OUT_OF_MEMORY if there was insufficient heap space. SEE ALSO
CURLOPT_PROXY(3), CURLOPT_HTTPPROXYTUNNEL(3), libcurl 7.54.0 December 21, 2016 CURLOPT_PRE_PROXY(3)
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