hi
actully authentication will be done on local ftp server and gw proxy will just
ensure that username and remote host/network is not in block list of firewall.till now
i am able to get login prompt from local ftp server thru my gw proxy and authenticate
user,but after auth if i try to give any command it says "cannot establish data
connection"
i just want to use restriction on users and commands and redirect what ever comes
on port 21 of gw proxy to local ftp server.
---
Manish Kumar Arya
On Fri, 19 Apr 2002 15:25:29
Binand Raj S. wrote:
>On Friday 19 Apr 2002 3:15 pm, Manish K Arya wrote:
>> hi
>> we are writing a transparent ftp proxy. our aim is to write a proxy code
>> that sits on gateway and provides proxy services(logging,auth,filtering
>> etc). when ever a user from external n/w does ftp on gateway,our proxy
>> program forwards that request to some internal ftp server after validating
>> remote user and machine.means if user does ftp on gw he/she gets login
>> prompt from some internal ftp server.when user does login he get
>> authenticated from internal ftp server. but at this stage there is a
>> problem now if we try to give some commnd from ftp client.we get error like
>> no data connection. what can we do for establishing data connection after
>> auth.
>
>Your mail is not very clear. You say your proxy provides authentication
>services, and that it validates the remote user and machine. But you also
>say that the login prompt and authentication is that of the internal FTP
>server. Which is it?
>
>Also, do you understand the FTP protocol? Specifically, do you know that
>it has a quirk in that it requires a control connection and a data connection?
>Also, about active and passive FTP?
>
>BInand
>
>
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