Difference between revisions of "Steam Link"
From Exploitee.rs
Jump to navigationJump to search
Parkerlreed (talk | contribs) m |
Parkerlreed (talk | contribs) m |
||
| Line 11: | Line 11: | ||
== Information == | == Information == | ||
Steam Link is running a custom Linux build by Valve. An SDK is provided to develop | Steam Link is running a custom Linux build by Valve. An SDK is provided to develop applications to run on the device itself. https://github.com/ValveSoftware/steamlink-sdk | ||
Various functions can be enabled by putting a file in a certain location on a FAT32 USB drive and booting the Link with it plugged in. Create directories as needed. | Various functions can be enabled by putting a file in a certain location on a FAT32 USB drive and booting the Link with it plugged in. Create directories as needed. | ||
Revision as of 14:29, 21 September 2016
Steam Link is an in-home streaming appliance made by Valve.
Specs
- CPU: Marvell ARMv7 Processor (Can't find exact model)
- RAM: 512MB (~256MB available after boot)
- Dimensions: 123.19 x 14.73 x 89.66 mm
- Ports: 3 USB 2.0, HDMI 2.0, 10/100 Ethernet, Power
Information
Steam Link is running a custom Linux build by Valve. An SDK is provided to develop applications to run on the device itself. https://github.com/ValveSoftware/steamlink-sdk
Various functions can be enabled by putting a file in a certain location on a FAT32 USB drive and booting the Link with it plugged in. Create directories as needed.
- /steamlink/config/system/enable_ssh.txt (Just create a blank file) - Enables SSH until next factory reset or removing /mnt/config/system/enable_ssh.txt
- /steamlink/config/system/display_resolution.txt - Putting "720P" in that file will limit the Link to that resolution
- /steamlink/config/system/update_branch.txt - Creating that file with one of their build numbers as the contents will make the Link download and install that particular version
The best part? With SSH you get a root shell! Username: root password: steamlink (Change with passwd after first login)
It comes with a surprising amount of regular utilities
# uname -a Linux steamlink-87F1 3.8.13-mrvl #52 PREEMPT Thu Sep 1 11:23:18 PDT 2016 armv7l GNU/Linux # cat /proc/cpuinfo processor : 0 model name : ARMv7 Processor rev 0 (v7l) BogoMIPS : 995.32 Features : swp half thumb fastmult vfp edsp thumbee neon vfpv3 tls CPU implementer : 0x41 CPU architecture: 7 CPU variant : 0x3 CPU part : 0xc09 CPU revision : 0 Hardware : MV88DE3108 Revision : 0000 Serial : 0000000000000000\ # pulseaudio --version pulseaudio 8.0 # bluetoothctl --version 5.35 # bluetoothctl [NEW] Controller E0:31:9E:0C:BA:0B BlueZ 5.35 [default] [bluetooth]# exit [DEL] Controller E0:31:9E:0C:BA:0B BlueZ 5.35 [default] # connmand --version 1.29 # connmanctl state State = online OfflineMode = False SessionMode = False # connmanctl services *AO ASUS_5G wifi_e0319e0cba0a_415355535f3547_managed_psk
Valve's frontend actually interfaces with connman/bluetoothd for WiFi/Bluetooth connections.
# df -h
Filesystem Size Used Available Use% Mounted on
/dev/mtdblock9 1.0G 239.0M 785.0M 23% /
none 131.4M 292.0K 131.1M 0% /dev
devtmpfs 131.4M 292.0K 131.1M 0% /dev
tmpfs 131.4M 48.0K 131.3M 0% /tmp
tmpfs 131.4M 0 131.4M 0% /mnt
/dev/block/mtdblock4 32.0M 6.1M 25.9M 19% /mnt/factory_setting
/dev/block/mtdblock10
1.9G 32.2M 1.8G 2% /mnt/scratch
/dev/block/mtdblock3 512.0M 158.0M 354.0M 31% /mnt/config
unionfs 512.0M 158.0M 354.0M 31% /etc
unionfs 512.0M 158.0M 354.0M 31% /var
unionfs 512.0M 158.0M 354.0M 31% /home
unionfs 512.0M 158.0M 354.0M 31% /usr/local
tmpfs 131.4M 20.0K 131.4M 0% /var/run
# mount
rootfs on / type rootfs (rw)
/dev/mtdblock9 on / type yaffs2 (ro,relatime)
none on /dev type tmpfs (rw,relatime)
sys on /sys type sysfs (rw,relatime)
proc on /proc type proc (rw,relatime)
devtmpfs on /dev type tmpfs (rw,relatime)
devpts on /dev/pts type devpts (rw,relatime,mode=600)
tmpfs on /tmp type tmpfs (rw,relatime)
tmpfs on /mnt type tmpfs (rw,relatime)
/dev/block/mtdblock4 on /mnt/factory_setting type yaffs2 (ro,relatime)
/dev/block/mtdblock10 on /mnt/scratch type yaffs2 (rw,relatime)
/dev/block/mtdblock3 on /mnt/config type yaffs2 (rw,relatime)
unionfs on /etc type unionfs (rw,relatime,dirs=/mnt/config/overlay/etc=rw:/etc=ro)
unionfs on /var type unionfs (rw,relatime,dirs=/mnt/config/overlay/var=rw:/var=ro)
unionfs on /home type unionfs (rw,relatime,dirs=/mnt/config/overlay/home=rw:/home=ro)
unionfs on /usr/local type unionfs (rw,relatime,dirs=/mnt/config/overlay/usr/local=rw:/usr/local=ro)
tmpfs on /var/run type tmpfs (rw,relatime)
# busybox --help
BusyBox v1.24.1 (2016-01-19 12:54:10 PST) multi-call binary.
BusyBox is copyrighted by many authors between 1998-2015.
Licensed under GPLv2. See source distribution for detailed
copyright notices.
Usage: busybox [function [arguments]...]
or: busybox --list[-full]
or: busybox --install [-s] [DIR]
or: function [arguments]...
BusyBox is a multi-call binary that combines many common Unix
utilities into a single executable. Most people will create a
link to busybox for each function they wish to use and BusyBox
will act like whatever it was invoked as.
Currently defined functions:
[, [[, acpid, add-shell, addgroup, adduser, adjtimex, arp, arping, ash, awk, base64, basename, beep, blkid, blockdev, bootchartd, brctl, bunzip2, bzcat, bzip2, cal, cat, catv, chat, chattr, chgrp, chmod, chown, chpasswd, chpst,
chroot, chrt, chvt, cksum, clear, cmp, comm, conspy, cp, cpio, crond, crontab, cryptpw, cttyhack, cut, date, dc, dd, deallocvt, delgroup, deluser, depmod, devmem, df, dhcprelay, diff, dirname, dmesg, dnsd, dnsdomainname,
dos2unix, du, dumpkmap, dumpleases, echo, ed, egrep, eject, env, envdir, envuidgid, ether-wake, expand, expr, fakeidentd, false, fatattr, fbset, fbsplash, fdflush, fdformat, fdisk, fgconsole, fgrep, find, findfs, flock, fold,
free, freeramdisk, fsck, fsck.minix, fstrim, fsync, ftpd, ftpget, ftpput, fuser, getopt, getty, grep, groups, gunzip, gzip, halt, hd, hdparm, head, hexdump, hostid, hostname, httpd, hush, hwclock, id, ifconfig, ifdown,
ifenslave, ifplugd, ifup, inetd, init, insmod, install, ionice, iostat, ip, ipaddr, ipcalc, ipcrm, ipcs, iplink, iproute, iprule, iptunnel, kbd_mode, kill, killall, killall5, klogd, last, less, linux32, linux64, linuxrc, ln,
loadfont, loadkmap, logger, login, logname, logread, losetup, lpd, lpq, lpr, ls, lsattr, lsmod, lsof, lspci, lsusb, lzcat, lzma, lzop, lzopcat, makedevs, makemime, man, md5sum, mdev, mesg, microcom, mkdir, mkdosfs, mke2fs,
mkfifo, mkfs.ext2, mkfs.minix, mkfs.vfat, mknod, mkpasswd, mkswap, mktemp, modinfo, modprobe, more, mount, mountpoint, mpstat, mt, mv, nameif, nanddump, nandwrite, nbd-client, nc, netstat, nice, nmeter, nohup, nslookup, ntpd,
od, openvt, passwd, patch, pgrep, pidof, ping, ping6, pipe_progress, pivot_root, pkill, pmap, popmaildir, poweroff, powertop, printenv, printf, ps, pscan, pstree, pwd, pwdx, raidautorun, rdate, rdev, readahead, readlink,
readprofile, realpath, reboot, reformime, remove-shell, renice, reset, resize, rev, rm, rmdir, rmmod, route, rpm, rpm2cpio, rtcwake, run-parts, runlevel, runsv, runsvdir, rx, script, scriptreplay, sed, sendmail, seq, setarch,
setconsole, setfont, setkeycodes, setlogcons, setserial, setsid, setuidgid, sh, sha1sum, sha256sum, sha3sum, sha512sum, showkey, shuf, slattach, sleep, smemcap, softlimit, sort, split, start-stop-daemon, stat, strings, stty, su,
sulogin, sum, sv, svlogd, swapoff, swapon, switch_root, sync, sysctl, syslogd, tac, tail, tar, tcpsvd, tee, telnet, telnetd, test, tftp, tftpd, time, timeout, top, touch, tr, traceroute, traceroute6, true, truncate, tty,
ttysize, tunctl, ubiattach, ubidetach, ubimkvol, ubirmvol, ubirsvol, ubiupdatevol, udhcpc, udhcpd, udpsvd, uevent, umount, uname, unexpand, uniq, unix2dos, unlink, unlzma, unlzop, unxz, unzip, uptime, users, usleep, uudecode,
uuencode, vconfig, vi, vlock, volname, wall, watch, watchdog, wc, wget, which, who, whoami, whois, xargs, xz, xzcat, yes, zcat, zcip
# free -m
total used free shared buffers cached
Mem: 262 119 143 0 0 71
-/+ buffers/cache: 47 215
Swap: 0 0 0
You only have sh/ash from Busybox BUT you can grab a static Bash binary and it works great. http://ftp.us.debian.org/debian/pool/main/b/bash/bash-static_4.4-1_armhf.deb (I just extracted the binary from this and placed it in /usr/local/bin on the Link)
And since we have Busybox we also have chroot! Extract http://os.archlinuxarm.org/os/ArchLinuxARM-armv7-latest.tar.gz to an EXT3 formatted flash drive and plug it into the Link.
# mount /dev/block/sda1 /mnt/usb # mount -t proc proc /mnt/usb/proc/ # mount -t sysfs sys /mnt/usb/sys/ # mount -o bind /dev /mnt/usb/dev/ # mount -t devpts devpts /mnt/usb/dev/pts/ # chroot /mnt/usb /bin/bash [root@steamlink-87F1 /]# [root@steamlink-87F1 /]# uname -a Linux steamlink-87F1 3.8.13-mrvl #52 PREEMPT Thu Sep 1 11:23:18 PDT 2016 armv7l GNU/Linux [root@steamlink-87F1 /]# useradd -m parker [root@steamlink-87F1 /]# passwd parker New password: Retype new password: passwd: password updated successfully [root@steamlink-87F1 /]# ls -a /home/parker/ . .. .bash_logout .bash_profile .bashrc [root@steamlink-87F1 /]# pacman -Syu :: Synchronizing package databases... core 211.8 KiB 963K/s 00:00 [######################################################################################] 100% extra 2.3 MiB 4.85M/s 00:00 [######################################################################################] 100% community 3.8 MiB 4.73M/s 00:01 [######################################################################################] 100% alarm 110.2 KiB 648K/s 00:00 [######################################################################################] 100% aur 29.3 KiB 7.15M/s 00:00 [######################################################################################] 100% :: Starting full system upgrade... resolving dependencies... looking for conflicting packages... Packages (8) curl-7.50.2-1 gawk-4.1.4-1 gcc-libs-6.2.1-1 gnutls-3.4.15-1 libutil-linux-2.28.2-1 linux-armv7-4.7.3-1 mkinitcpio-21-1 util-linux-2.28.2-1 Total Download Size: 56.39 MiB Total Installed Size: 138.24 MiB Net Upgrade Size: 0.18 MiB :: Proceed with installation? [Y/n] :: Retrieving packages... gcc-libs-6.2.1-1-armv7h 10.2 MiB 4.71M/s 00:02 [######################################################################################] 100% libutil-linux-2.28.2-1-armv7h 252.0 KiB 1105K/s 00:00 [######################################################################################] 100% curl-7.50.2-1-armv7h 776.2 KiB 4.62M/s 00:00 [######################################################################################] 100% gawk-4.1.4-1-armv7h 926.3 KiB 6.96M/s 00:00 [######################################################################################] 100% gnutls-3.4.15-1-armv7h 2.0 MiB 2.38M/s 00:01 [######################################################################################] 100% util-linux-2.28.2-1-armv7h 1687.2 KiB 4.25M/s 00:00 [######################################################################################] 100% mkinitcpio-21-1-any 38.0 KiB 3.71M/s 00:00 [######################################################################################] 100% linux-armv7-4.7.3-1-armv7h 40.6 MiB 3.33M/s 00:12 [######################################################################################] 100% (8/8) checking keys in keyring [######################################################################################] 100% (8/8) checking package integrity [######################################################################################] 100% (8/8) loading package files [######################################################################################] 100% (8/8) checking for file conflicts [######################################################################################] 100% (8/8) checking available disk space [######################################################################################] 100% :: Processing package changes... (1/8) upgrading gcc-libs [######################################################################################] 100% (2/8) upgrading libutil-linux [######################################################################################] 100% (3/8) upgrading curl [######################################################################################] 100% (4/8) upgrading gawk [######################################################################################] 100% (5/8) upgrading gnutls [######################################################################################] 100% (6/8) upgrading util-linux [######################################################################################] 100% (7/8) upgrading mkinitcpio [######################################################################################] 100% (8/8) upgrading linux-armv7 [######################################################################################] 100% >>> Updating module dependencies. Please wait ... :: Running post-transaction hooks... (1/1) Updating the info directory file...
