Extracting SquashFS based filesystem

Question

I'm trying to use binwalk to extract the firmware for the Ubiquiti Networks ER-X. Currently I've downloaded a copy of the firmware and uncompressed it. I opened the folder with the filesystem contents and found compat squashfs.tmp squashfs.tmp.md5 version.tmp vmlinux.tmp vmlinux.tmp.md5. I checked to see which file was the biggest and found squashfs.tmp to be the biggest at about 78MB in size. I ran binwalk with the -e flag but that didn't extract the filesystem. Link to the firmware.

Answer 1

I was able to extract the file system just fine. I used Binwalk v2.1.2b and have sasquatch installed.

Extracted file system:

_squashfs.tmp.extracted/squashfs-root $ ls
bin  boot  config  dev  etc  home  lib  media  mnt  opt  proc  root  root.dev  run  sbin  selinux  srv  sys  tmp  usr  var

It is indeed for a MIPS device:

$ file bin/bash
bin/bash: ELF 32-bit LSB  executable, MIPS, MIPS-II version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.26, BuildID[sha1]=1b20797b11fa0a481a334f911ac5dfa27ce20c75, stripped

Make sure all of your tools are up to date and you have the necessary plugins installed. From the installation page:

Binwalk relies on multiple external utilties in order to automatically extract/decompress files and data:

# Install standard extraction utilities
$ sudo apt-get install mtd-utils gzip bzip2 tar arj lhasa p7zip p7zip-full cabextract cramfsprogs cramfsswap squashfs-tools sleuthkit default-jdk lzop srecord

# Install sasquatch to extract non-standard SquashFS images
$ sudo apt-get install zlib1g-dev liblzma-dev liblzo2-dev
$ git clone https://github.com/devttys0/sasquatch
$ (cd sasquatch && ./build.sh)

# Install jefferson to extract JFFS2 file systems
$ sudo pip install cstruct
$ git clone https://github.com/sviehb/jefferson
$ (cd jefferson && sudo python setup.py install)