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Full Discussion: Securing remote connections
Operating Systems Linux Securing remote connections Post 302357322 by AlbertGM on Tuesday 29th of September 2009 10:47:48 AM
Old 09-29-2009
Securing remote connections

Hi all,

I have a couple of questions I've been searching on internet but I didn't find a suitable solution. The aim is that I'd like to access to my home Linux (an 8.04 Ubuntu) from outside. I already achieved with ssh, but I'd like to secure as much as I can. These are questions:
  1. The account I use to login is a sudoer user. So, I want to connect with an unprivileged user, and then, only if I need, reconnect with that user inside my linux. I'd like to disable that account (root is always disabled) from remote connections. How can I do that? or Where can I find some information to disable that account from remote connections?
  2. One of places I'd like to connect is from office, which has a proxy to connect to a computer out of LAN. Almost all ports are disabled. I'd like to know a way to find out which ports are open, to open in my own home the right one (a port also open in office proxy). I thought using "nmap" or "nc" to my own Linux, but it also has almost all ports closed. So connection is not possible unless I open all ports in my router, which is quite dangerous. Using nc or nmap I won't be able to know if a 'connection refused' is because my router has a certain port closed or because port in office proxy is close.
    For example I opened port 443 in my router which redirects to port 22 to my linux. I used this port, because I guessed HTTPS port was available in office proxy. I got right. However, this port is very used and I don't like to leave that port open at home.
Because of my english I don't know if my explanation is good enough, sorry Smilie Any help will be very appreciate.

Thanks
 

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REDIR(1)						      General Commands Manual							  REDIR(1)

NAME
redir - redirect tcp connections SYNOPSIS
redir [--laddr=incoming.ip.address] [--caddr=host] [--debug] [--syslog] [--name=str] [--timeout=n] [--bind_addr=my.other.ip.address] [--ftp=type] [--transproxy] [--connect=host:port] --lport=port --cport=port [--bufsize=n] [--max_bandwidth=n] [--random_wait=n] [--wait_in_out=n] redir --inetd [--caddr=host] [--debug] [--syslog] [--name=str] [--timeout=n] [--ftp=type] [--transproxy] [--connect=host:port] --cport=port [--bufsize=n] [--max_bandwidth=n] [--random_wait=n] [--wait_in_out=n] DESCRIPTION
Redir redirects tcp connections coming in to a local port to a specified address/port combination. It may be run either from inetd or as a standalone daemon. Depending on how redir was compiled, not all options may be available. OPTIONS
--lport Specifies port to listen for connections on (when not running from inetd) --laddr IP address to bind to when listening for connections (when not running from inetd) --cport Specifies port to connect to. --caddr Specifies remote host to connect to. (localhost if omitted) --inetd Run as a process started from inetd, with the connection passed as stdin and stdout on startup. --debug Write debug output to stderr or syslog. --name Specify program name to be used for TCP wrapper checks and syslog logging. --timeout Timeout and close the connection after n seconds of inactivity. --syslog Log information to syslog. --bind_addr Forces redir to pick a specific address/interface to bind to when it listens for incoming connections. --ftp When using redir for an FTP server, this will cause redir to also redirect ftp connections. Type should be specified as either "port", "pasv", or "both", to specify what type of FTP connection to handle. Note that --transproxy often makes one or the other (generally port) undesirable. --transproxy On a linux system with transparent proxying enabled, causes redir to make connections appear as if they had come from their true origin. (see /usr/share/doc/redir/transproxy.txt) --connect Redirects connections through an HTTP proxy which supports the CONNECT command. Specify the address and port of the proxy using --caddr and --cport. --connect requires the hostname and port which the HTTP proxy will be asked to connect to. --bufsize n Set the bufsize (defaut 4096) in bytes. Can be used combined with --max_bandwidth or --random_wait to simulate a slow con- nection. --max_bandwidth n Reduce the bandwidth to be no more than n bits/sec. The algorithme is basic, the goal is to simulate a slow connection, so there is no pic acceptance. --random_wait n Wait between 0 and 2 x n milliseconds before each "packet". A "packet" is a bloc of data read in one time by redir. A "packet" size is always less than the bufsize (see also --bufsize). --wait_in_out n Apply --max_bandwidth and --random_wait for input if n=1, output if n=2 and both if n=3. SEE ALSO
inetd(1) local REDIR(1)
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