Proof of Concept: Chrooting SyncApp in Debian Squeeze (6)

[crubb]

Hey,

EDIT: Adapted for the "new" BitTorrent Sync.

finally got my invitation. As I am not really comfortable running closed-source binaries on my linux box, please find a proof of concept for running btsync in a chroot with it's own user below.

# useradd -m -s /bin/false btsync
# cd /home/btsync/

Download the latest *x64.gz and put it in /home/btsync

# wget http://btsync.s3-website-us-east-1.amazonaws.com/btsync_x64.tar.gz

Setup the chroot

# tar xfvz btsync_x64.tar.gz
# chmod u+x btsync

# mkdir dev etc lib lib64 proc sync tmp
# (cd dev; mknod random c 1 8; mknod urandom c 1 9)
# (cd etc; cp /etc/ld.so.cache /etc/resolv.conf /etc/nsswitch.conf /etc/localtime .; grep btsync /etc/passwd > passwd; grep btsync /etc/group > group)
# (cd lib; cp /lib/libpthread.so.0 /lib/libnsl.so.1 /lib/libdl.so.2 /lib/libnss_compat.so.2 /lib/libm.so.6 /lib/libc.so.6 /lib/librt.so.1 /lib/libnss_nis.so.2 /lib/libnss_files.so.2 .)
# cp /lib64/ld-linux-x86-64.so.2 lib64/

# mkdir -p usr/share/locale/
# cp /usr/share/locale/locale.alias usr/share/locale/
# mkdir -p usr/lib/locale/
# cp /usr/lib/locale/locale-archive usr/lib/locale/

# chown -R btsync:btsync /home/btsync

# mount -o bind /proc /home/btsync/proc

And run btsync

# chroot --userspec $(id -u btsync) /home/btsync ./btsync --config ./btsync.conf

Have fun!

[kos13]

Thanks!