MESSAGE
| DATE | 2004-05-26 |
| FROM | Ruben I Safir
|
| SUBJECT | Subject: [hangout] Fwd: Linux Journal Weekly Newsletter - May 26 [html@ssc.com]
|
On 2004.05.26 04:37 Linux Journal News Notes wrote:
Linux Journal Weekly News Notes -- May 26
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Feature Links of the Week
How Linux Saved My Files and My Job:
http://www.linuxjournal.com/article.php?sid=7596 -- Rory Winston
shares his adventure of trying to recover a hard drive on his Windows
laptop. The only thing that worked? BG-Rescue Linux.
Reducing OS Boot Times for In-Car Computer Applications, Part II:
http://www.linuxjournal.com/article.php?sid=7594 -- In part two of his
series, Damien Stolarz outlines the steps involved in the boot
process, the time involved for each and ways to reduce the overall
boot time.
Writing Scalable Applications with PHP:
http://www.linuxjournal.com/article.php?sid=7593 -- In a follow-up to
his article in the April issue of LJ, Xavier Spriet provides code and
procedures for developing working PHP applications.
Tech Tip
The saga of "how can I securely send mail from my laptop when it's
plugged in to someone else's network" continues. If you run a wireless
network, you probably block port 25 to keep people from using your
network for spamming. The problem is how do you make an outgoing SMTP
connection from your laptop when you travel to other people's wireless
networks?
Miek Gieben has an elegant answer based on Postfix and OpenSSH. Set up
Postfix on the laptop to use localhost and a high port as its
relayhost, then tunnel that high port to port 25 on your mail server.
Details and config file entries for the basic method are here:
http://www.miek.nl/linux/postfix.html.
For security, though, you don't want to let people log in to your
OpenSSH server as you without a passphrase. So, instead of using your
main OpenSSH identity for the tunnel, add a user called tunnel to the
OpenSSH server and make a tunnel-only SSH key on the laptop with this
command:
ssh-keygen -t dsa -f tunnel
In the file tunnel.pub, add the following options to the beginning of
the line:
command="/bin/false",no-X11-forwarding,no-agent-forwarding,no-pty
and then copy the contents of tunnel.pub to the end of the tunnel
user's .ssh/authorized_keys file on the OpenSSH server.
If you can run only /bin/false and you can't forward X or the SSH
agent, what's left? Port forwarding. Add -i tunnel to Miek's
instructions to use the tunnel, and replace miekg-at- with tunnel-at-.
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