Archive for category *NIX

SSL, Postfix and IMAP

When setting up authenticated SMTP service, be sure your IMAP server is accessible. The reason for this is Postfix will check the username using SASLauth daemon. And SASLauth damon uses “rimap” method for checking the username. Rimap is “remote IMAP”, and it tries to log into the configured IMAP service, which by default is defined as ‘localhost’.

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The Power of Pipes

Okay guys, the log if filling with

sshd[20117]: Invalid user pi from port 50416
sshd[20117]: input_userauth_request: invalid user pi [preauth]
sshd[20117]: Received disconnect from port 50416:11: Bye Bye [preauth]
sshd[20117]: Disconnected from port 50416 [preauth]
sshd[20119]: Invalid user cubie from port 39772
sshd[20119]: input_userauth_request: invalid user cubie [preauth]
sshd[20119]: Received disconnect from port 39772:11: Bye Bye [preauth]
sshd[20119]: Disconnected from port 39772 [preauth]
sshd[20121]: Invalid user guest from port 42858

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Postfix and virtual SMTP users

Short how-to use the save virtual users both for receiving emails via IMAPS, and sending via SMTP, or just rants for myself:

Source for the ideas and setup

/etc/postfix/ must contain:
smtpd_sasl_local_domain =
smtpd_sasl_auth_enable = yes

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Rant on Apache2

Recently I was trying to move my sites to SSL – for various reasons.
The test site went fluently, while the work machine refused to serve SSL content. While testing with ‘wget’, the error I received was

GnuTLS: An unexpected TLS packet was received.

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is the only missing keyword, OpenVPN client-to-server config need to work correctly on the client.
It took me 3 days to figure this out, a lot of RTFM’ing and head-banging.

Full client config looks this way:
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IPsec to Sonicwall appliance

Just a note:
when you need to establish IPsec connection to Sonicwall NSA 3500 firewall, here’s working config:
Linux side:
/etc/ipsec.conf :

include /etc/ipsec.d/*.conf

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Get rid of removed packages in Debian

Every time package is removed via `apt-get remove`, a tiny piece of its configuration can be kept in your system. If you ever need to reinstall the package, this information can be re-used. These packages has status ‘rc’ in the output of `dpkg -l`. But if you want to keep your system tidy and clean, you may want them to be removed.

The miraculous command is

dpkg -l | egrep ^r | cut -d ‘ ‘ -f 3 | xargs apt-get remove –purge -y

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Running VirtualBox guests from physical drive

Dual boot is perfect solution in most cases.

On the other hand, if you need to peep into the other system’s files, you need to re-boot. Or use sometimes not so stable filesystem utilities.
Running fully virtualized OS, using eg Xen as supervisor, creates additional load an hardware, maybe not too big when running multiple OS’es on the pretty new server, but significant, if it is a laptop. And yes, you NEED to keep data in-sync between virtual and real OS. Read the rest of this entry »

Localised fonts

The very first try on “Flux-the-Architect“. Added Ą,Č,Ę,Ė,Į,Š,Ų,Ū,Ž glyphs and some minor symbols (°, ±, ², ³). The font is OpenType in TrueType encoding. OpenType fonts in PS encoding does not work in AutoCAD.

Troubles in Virtual World

For testing i’ve set up a VirtualBox, running Debian/testing in x86and amd64 architectures.
In some cases, mouse integration does not work correctly. Although mouse works perfectly in the Guest window, it’s impossible to move it out without pressing Host key (left Ctrl in MS Windows).
VirtualBox guest additions are installed, guest resizing and shared folders works perfectly.
The solution was found in VirtualBox forums :
/etc/X11/xorg.conf must contain

Section “InputDevice”
Identifier “Configured Mouse”
Driver “vboxmouse”
Option “CorePointer”

note two lines: vboxmouse tells to use mouse driver from VirtualBox guest additions, and CorePointer instructs to use this pointer as primary. Without CorePointer line the vboxmouse driver is used, but it’s still impossible to move it outside guest’s window.