Blog of Julian Andres Klode

Debian, Ubuntu, Linux in general, and other free software

hardlink 0.3.0 released; xattr support

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Today I not only submitted my bachelor thesis to the printing company, I also released a new version of hardlink, my file deduplication tool.

hardlink 0.3 now features support for xattr support, contributed by Tom Keel at Intel. If this does not work correctly, please blame him.

I also added support for a –minimum-size option.

Most of the other code has been tested since the upload of RC1 to experimental in September 2012.

The next major version will split up the code into multiple files and clean it up a bit. It’s getting a bit long now in a single file.

Written by Julian Andres Klode

September 25, 2014 at 14:41

Posted in Uncategorized

APT 1.1~exp3 released to experimental: First step to sandboxed fetcher methods

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Today, we worked, with the help of ioerror on IRC, on reducing the attack surface in our fetcher methods.

There are three things that we looked at:

  1. Reducing privileges by setting a new user and group
  2. chroot()
  3. seccomp-bpf sandbox

Today, we implemented the first of them. Starting with 1.1~exp3, the APT directories /var/cache/apt/archives and /var/lib/apt/lists are owned by the “_apt” user (username suggested by pabs). The methods switch to that user shortly after the start. The only methods doing this right now are: copy, ftp, gpgv, gzip, http, https.

If privileges cannot be dropped, the methods will fail to start. No fetching will be possible at all.

Known issues:

  • We drop all groups except the primary gid of the user
  • copy breaks if that group has no read access to the files

We plan to also add chroot() and seccomp sandboxing later on; to reduce the attack surface on untrusted files and protocol parsing.

Written by Julian Andres Klode

September 24, 2014 at 23:05

Posted in Uncategorized

Configuring an OpenWRT Router as a repeater for a FRITZ!Box with working Multicast

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Since some time, those crappy Fritz!Box devices do not support WDS anymore, but rather a proprietary solution created by AVM. Now what happens if you have devices in another room that need/want wired access (like TVs, Playstations) or if you want to extend the range of your network? Buying another Fritz!Box is not very cost efficient – What I did was to buy a cheap TP-Link TL-WR841N (can be bought for 18 euros) and installed OpenWRT on it. Here’s how I configured it to act as a WiFi bridge.

Basic overview: You configure OpenWRT into station mode (that is, as a WiFi client) and use relayd to relay between the WiFi network and your local network. You also need igmpproxy to proxy multicast packages between those networks, other UPnP stuff won’t work.

I did this on the recent Barrier Braker RC2. It should work on older versions as well, but I cannot promise it (I did not get igmpproxy to work in Attitude Adjustment, but that was probably my fault).

Note: I don’t know if it works with IPv6, I only use IPv4.

You might want to re-start (or start) services after the steps, or reboot the router afterwards.

Configuring WiFi connection to the FRITZ!Box

Add to: /etc/config/network

config interface 'wwan'
	option proto 'dhcp'

(you can use any other name you want instead of wwan, and a static IP. This will be your uplink to the Fritz!Box)

Replace wifi-iface in: /etc/config/wireless:

config wifi-iface
	option device 'radio0'
	option mode 'sta'
	option ssid 'FRITZ!Box 7270'
	option encryption 'psk2'
	option key 'PASSWORD'
	option network 'wwan'

(adjust values as needed for your network)

Setting up the pseudo-bridge

First, add wwan to the list of networks in the lan zone in the firewall. Then add a forward rule for the lan network (not sure if needed). Afterwards, configure a new stabridge network and disable the built-in DHCP server.

Diff for /etc/config/firewall

@@ -10,2 +10,3 @@ config zone
 	list network 'lan'
+	list network 'wwan'
 	option input 'ACCEPT'
@@ -28,2 +29,7 @@ config forwarding
 
+# Not sure if actually needed
+config forwarding
+	option src 'lan'
+	option dest 'lan'
+
 config rule

Add to /etc/config/network

config interface 'stabridge'
	option proto 'relay'
	option network 'lan wwan'
	option ipaddr '192.168.178.26'

(Replace 192.168.178.26 with the IP address your OpenWRT router was given by the Fritz!Box on wlan0)

Also make sure to ignore dhcp on the lan interface, as the DHCP server of the FRITZ!Box will be used:

Diff for /etc/config/dhcp

@@ -24,2 +24,3 @@ config dhcp 'lan'
        option ra 'server'
+       option ignore '1'

Proxying multicast packages

For proxying multicast packages, we need to install igmpproxy and configure it:

Add to: /etc/config/firewall

# Configuration for igmpproxy
config rule
	option src      lan
	option proto    igmp
	option target   ACCEPT

config rule
	option src      lan
	option proto    udp
	option dest     lan
	option target   ACCEPT

(OpenWRT wiki gives a different 2nd rule now, but this is the one I currently use)

Replace /etc/config/igmpproxy with:

config igmpproxy
	option quickleave 1

config phyint
	option network wwan
	option direction upstream
	list altnet 192.168.178.0/24

config phyint
	option network lan
	option direction downstream
	list altnet 192.168.178.0/24

(Assuming Fritz!Box uses the 192.168.178.0/24 network)

Don’t forget to enable the igmpproxy script:

# /etc/init.d/igmpproxy enable

Optional: Repeat the WiFi signal

If you want to repeat your WiFi signal, all you need to do is add a second wifi-iface to your /etc/config/wireless.

config wifi-iface
	option device 'radio0'
	option mode 'ap'
	option network 'lan'
	option encryption 'psk2+tkip+ccmp'
	option key 'PASSWORD'
	option ssid 'YourForwardingSSID'

Known Issues

If I was connected via WiFi to the OpenWRT AP and switch to the FRITZ!Box AP, I cannot connect to the OpenWRT router for some time.

The igmpproxy tool writes to the log about changing routes.

Future Work

I’ll try to get the FRITZ!Box replaced by something that runs OpenWRT as well, and then use OpenWRT’s WDS support for repeating; because the FRITZ!Box 7270v2 is largely crap – loading a page in its web frontend takes 5 (idle) – 20 seconds (1 download), and it’s WiFi speed is limited to about 20 Mbit/s in WiFi-n mode (2.4 GHz (or 5 GHz, does not matter), 40 MHz channel). It seems the 7270 has a really slow CPU.

Written by Julian Andres Klode

August 7, 2014 at 01:01

Posted in OpenWRT

ThinkPad X230 UEFI broken by setting a setting

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Today, I decided to set my X230 back to UEFI-only boot, after having changed that for a bios upgrade recently (to fix a resume bug). I then choose to save the settings and received several error messages telling me that the system ran out of resources (probably storage space for UEFI variables).

I rebooted my machine, and saw no logo appearing. Just something like an underscore on a text console. The system appears to boot normally otherwise, and once the i915 module is loaded (and we’re switching away from UEFI’s Graphical Output Protocol [GOP]) the screen works correctly.

So it seems the GOP broke.

What should I do next?

Written by Julian Andres Klode

April 9, 2014 at 14:57

Posted in General

Tagged with , , ,

python-apt now native Python 3 code

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Today I made an important change to the python-apt code: It is now native Python 3 code (but also works under Python 2). The previous versions all run 2to3 during the build process to create a Python 3 version. This is no longer needed, as the code is now identical.

As part of that change, python-apt now only supports Python 2.7, Python 3.3, and newer. I’m using some features only present in 3.3 like Python2 unicode literal syntax in order to keep the code simple.

Here’s how I did it:

I took the Python 2 code and ran 2to3 -f print -x future on it. This turned every print statement in a call to the print function. I then went ahead and added a “from __future__ import print_function” to the top of each module. This was the first commit.

For the second commit, I ran 2to3 -p -x future to convert the remaining stuff to Python 3, and then undid some changes (like unicode literals) and fixed the rest of the changes to work under both Python 2 and 3. Sometimes I added a top-level code like:

if sys.version_info_major >= 3:
    unicode = str

So I could use unicode in the code for the Python 2 cases.

I used various backported modules like io and stuff only available in Python 2.7, so dropped support for Python 2.6.

Written by Julian Andres Klode

January 6, 2014 at 17:46

Posted in Debian, Python

python-apt 0.9 released

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I released python-apt 0.9. This completely removes support for the old API from the code base (it was disabled for the entirety of 0.8 in Debian, and in Ubuntu since saucy). Highlights:

  • Cleanup: Complete removal of old-api support code
  • Bug fix: Various coverty bug fixes by Michael Vogt
  • Bug fix: Correctly handles multi-arch dependencies in apt.debfile, so packagekit and gdebi can now install local multi-arch packages correctly
  • Bug fix: A segmentation fault has been fixed. When releasing the value of the policy attribute of an apt_pkg.Cache object, its destructor deleted the pkgPolicy, but that was managed by a CacheFile from APT, causing it to be deleted twice.
  • Bug fix: Tests do not depend on the contents of /tmp anymore
  • Bug fix: All examples and old tests have been updated to the current python-apt API
  • Feature: Paths can now be specified using ‘bytes’ objects instead of ‘str’ in Python 3.
  • Ubuntu-specific: Meta-data for Ubuntu 14.04 — although with a typo (‘thar’ instead of ‘tahr’), but that is fixed in git

 

Written by Julian Andres Klode

October 22, 2013 at 00:03

Posted in Debian

Review: ThinkPad X230

This week, a few hours after Lenovo announced the X240, I bought an X230. Normally, the X230 model I bought comes with a Core i5-3320M CPU, 4GB RAM, 500GB HDD. My model was a special set including a second 4GB RAM stick and a 128 GB mSATA Plextor SSD. It came without Windows; and the ThinkVantage button is black instead of blue and has no label.

I put a fresh installation of unstable on it and tweaked it to save more power when on battery (enabled RC6++, and enabled autosuspend and other powertop suggestions with a script in /etc/pm/power.d); and configured hdparm.conf to put my hard disk into standby after 5 seconds (it’s only used for big data anyway, so most of the time it is unused). It now consumes 5W in idle with minimum brightness, and 8-10W with brightness 13 of 15. Consumption when surfing is 10 – 15 watts. Booting from grub to gdm is fast, I did not measure it, but it probably took about 5 seconds.

The IPS screen looks really good. Much much much better than the screen in my 2010 Edge 15 (I reviewed that one in 2010). It seems a bit more glossy than that one, but still matte. Keyboard is good as well. The touch pad is crap however. All hardware seems to work.

Comparison to the X240 for others who think about buying one of them: The X240 is lighter and thinner (it’s an Ultrabook) and has an optional FullHD 12.5 inch screen. It also offers a much larger touchpad and palm rest. But compared to the X230, the X240 lacks many things: No dedicated buttons for the trackpoint (you need to use the click-pad), it’s limited at 8GB RAM, uses a slower low-voltage Haswell CPU, and it uses the new M.2 connector (probably supporting only the shortest cards) instead of mini-PCIe, so it’s not really possible to add an additional SSD currently; as M.2 SSDs do not seem to be available yet. I also do not know whether the X240 offers ThinkLight or LEDs for hard drive activity and similar.

Written by Julian Andres Klode

September 7, 2013 at 18:43

Posted in General

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