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500 OOPS: vsftpd: refusing to run with writable root inside chroot ()

If you updated recently your system to Debian wheezy and you are using vsftpd with enabled chrooted local users ...

[~] # grep -i  ^chroot_local_user=yes /etc/vsftpd.conf | tail -1
chroot_local_user=YES

... you maybe faced with the following problem:

500 OOPS: vsftpd: refusing to run with writable root inside chroot()
Login failed.

This problem raised already in Bug #656900 and it was fixed by adjusting the documentation. Beside that there maybe configurations you want to relax such a strict check. Unfortunately this feature was implemented in version 3.0.0 which is not part of Debian wheezy:

- Add new config setting "allow_writeable_chroot" to help people in a bit of
a spot with the v2.3.5 defensive change. Only applies to non-anonymous.

The Frontier Group created a patched package of vsftpd for Ubuntu. After reviewing the patch we decided to also create a Debian package for wheezy.

You can easily install the package by the following sniplet:

echo "deb http://ftp.cyconet.org/debian wheezy-updates main non-free contrib" >> \
/etc/apt/sources.list.d/wheezy-updates.cyconet.list; \
aptitude update; aptitude install -t wheezy-updates debian-cyconet-archive-keyring vsftpd && \
echo "allow_writeable_chroot=YES" >> /etc/vsftpd.conf && /etc/init.d/vsftpd restart

Updates, in case of bugfixes in Debian wheezy, should be also available through this distribution channel.