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GNU GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
Preamble
The GNU General Public License is a free, copyleft license for
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The licenses for most software and other practical works are designed
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END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest
to attach them to the start of each source file to most effectively
state the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short
notice like this when it starts in an interactive mode:
<program> Copyright (C) <year> <name of author>
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<https://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.

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# Uh Oh
`uhoh` --- Notes, docs, scripts for Comma AI Three devkit.
Comma AI Three is hardware to connect to a vehicle for use with
open source `openpilot` AI for "self-driving" cars.
* https://comma.ai/
* https://github.com/commaai/openpilot
# Docs
See `docs/` directory for more info.
# Unofficial
This repository, documentation and code is
unofficial, unaffiliated with Comma AI.
# License
GPLv3+.
Copyright (C) 2022, Jeff Moe

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# Comma AI Comma Three Hardware
Eight core ARM 64 bit.
See also `docs/OS.md`.
```
root@tici:~# arch
aarch64
# Eight pretty ARM cores.
root@tici:~# cat /proc/cpuinfo
Processor : AArch64 Processor rev 12 (aarch64)
processor : 0
BogoMIPS : 38.40
Features : fp asimd evtstrm aes pmull sha1 sha2 crc32 atomics fphp asimdhp
CPU implementer : 0x51
CPU architecture: 8
CPU variant : 0x7
CPU part : 0x803
CPU revision : 12
...
processor : 7
BogoMIPS : 38.40
Features : fp asimd evtstrm aes pmull sha1 sha2 crc32 atomics fphp asimdhp
CPU implementer : 0x51
CPU architecture: 8
CPU variant : 0x6
CPU part : 0x802
CPU revision : 13
Hardware : Qualcomm Technologies, Inc SDA845
root@tici:~# free -h
total used free shared buff/cache available
Mem: 3.5Gi 460Mi 2.5Gi 141Mi 597Mi 2.9Gi
Swap: 0B 0B 0B
root@tici:~# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/root 9.8G 3.0G 6.3G 33% /
devtmpfs 1.7G 0 1.7G 0% /dev
tmpfs 1.8G 0 1.8G 0% /dev/shm
tmpfs 358M 40M 318M 12% /run
tmpfs 5.0M 4.0K 5.0M 1% /run/lock
tmpfs 1.8G 0 1.8G 0% /sys/fs/cgroup
tmpfs 150M 88K 150M 1% /tmp
tmpfs 128M 84M 45M 66% /var
/dev/sda10 12M 24K 11M 1% /systemrw
/dev/sda2 27M 24K 25M 1% /persist
/dev/sda12 30G 505M 28G 2% /data
/dev/sda11 108M 36K 99M 1% /cache
/dev/sde4 120M 43M 77M 36% /firmware
/dev/sde9 28M 20M 7.3M 73% /dsp
/dev/nvme0n1 916G 77M 870G 1% /data/media
overlay 150M 88K 150M 1% /home
tmpfs 358M 4.0K 358M 1% /run/user/1000
root@tici:~# lsusb
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 003: ID bbaa:ddcc
Bus 001 Device 004: ID 2c7c:0125 Quectel Wireless Solutions Co., Ltd. EC25 LTE modem
Bus 001 Device 002: ID 0000:0000
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
```
# Hard Drive
Has nice 1TB NVMe HD. That drive doesn't have a partition table.
```
root@tici:~# nvme list
Node SN Model Namespace Usage Format FW Rev
---------------- -------------------- ---------------------------------------- --------- -------------------------- ---------------- --------
/dev/nvme0n1 S64ANG0R513592B Samsung SSD 980 1TB 1 16.72 GB / 1.00 TB 512 B + 0 B 1B4QFXO7
root@tici:~# grep nvme /etc/fstab
/dev/nvme0n1 /data/media auto discard,nosuid,nodev,nofail,x-systemd.device-timeout=5s 0 0
root@tici:~# fdisk -l /dev/nvme0n1
Disk /dev/nvme0n1: 931.53 GiB, 1000204886016 bytes, 1953525168 sectors
Disk model: Samsung SSD 980 1TB
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
```
# Network
```
root@tici:~# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: bond0: <BROADCAST,MULTICAST,MASTER> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/ether 2a:2e:60:dd:35:dd brd ff:ff:ff:ff:ff:ff
3: dummy0: <BROADCAST,NOARP> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/ether fa:1f:5e:9b:5e:6b brd ff:ff:ff:ff:ff:ff
4: ip_vti0@NONE: <NOARP> mtu 1364 qdisc noop state DOWN group default qlen 1
link/ipip 0.0.0.0 brd 0.0.0.0
5: ip6_vti0@NONE: <NOARP> mtu 1500 qdisc noop state DOWN group default qlen 1
link/tunnel6 :: brd ::
6: sit0@NONE: <NOARP> mtu 1480 qdisc noop state DOWN group default qlen 1
link/sit 0.0.0.0 brd 0.0.0.0
7: ip6tnl0@NONE: <NOARP> mtu 1452 qdisc noop state DOWN group default qlen 1
link/tunnel6 :: brd ::
8: rmnet_ipa0: <> mtu 2000 qdisc noop state DOWN group default qlen 1000
link/[530]
9: wwan0: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/none
10: wlan0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN group default qlen 3000
link/ether 00:0a:f5:e7:d1:93 brd ff:ff:ff:ff:ff:ff
11: p2p0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 3000
link/ether 02:0a:f5:6e:d1:93 brd ff:ff:ff:ff:ff:ff
```

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How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest
to attach them to the start of each source file to most effectively
state the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
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(at your option) any later version.
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but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short
notice like this when it starts in an interactive mode:
<program> Copyright (C) <year> <name of author>
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<https://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.

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# Operating System
This thing is running Ubuntu 20.04.3 fork, not Android (!).
Fork is named `AGNOS`.
## GNU Userspace
Built with GNU, like Ubuntu and Debian.
## Linux Kernel
```
root@tici:~# uname -a
Linux tici 4.9.103+ #26 SMP PREEMPT Wed Dec 8 15:30:31 PST 2021 aarch64 aarch64 aarch64 Gx
root@tici:~# dmesg -T # select lines from the dmesg:
Linux version 4.9.103+ (batman@workstation-adeeb) (gcc version 8.2.1 20180802 (GNU Toolchain for the A-profile Architecture 8.2-2018-08 (arm-rel-8.23)) ) 1
Machine: Qualcomm Technologies, Inc. sda845 v2.1 TurboX-SOM_V01
efi: UEFI not found.
# And what do they use for entropy? Old seeds? :)
random: fast init done
# Kernel command line:
rcupdate.rcu_expedited=1 console=ttyMSM0,115200n8 earlycon=msm_geni_serial,0xA84000 androidboot.hardware=qcom androidboot.console=ttyMSM0 video=DSI-1:1080x2160@60e mdss_mdp.panel=0:dsi:0:dsi_ss_ea8074_fhd_cmd_display ehci-hcd.park=3 lpm_levels.sleep_disabled=1 service_locator.enable=1 androidboot.selinux=permissive firmware_class.path=/lib/firmware/updates net.ifnames=0 dyndbg="" root=/dev/sda6 androidboot.bootdevice=1d84000.ufshc androidboot.serialno=92d29dd androidboot.baseband=sda msm_drm.dsi_display0=dsi_fhd_ea8074_1080_cmd_display: androidboot.slot_suffix=_a skip_initramfs rootwait ro init=/sbin/init
# Tainted kernel!
snd_soc_wcd9xxx: module verification failed: signature and/or required key missing - tainting kernel
# Kernel Debug is on:
**********************************************************
** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE **
** **
** trace_printk() being used. Allocating extra memory. **
** **
** This means that this is a DEBUG kernel and it is **
** unsafe for production use. **
** **
** If you see this message and you are not debugging **
** the kernel, report this immediately to your vendor! **
** **
** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE **
**********************************************************
# Surely nothing could go wrong here....
SELinux: Starting in permissive mode
# nom
SMP: Total of 8 processors activated.
Linux video capture interface: v2.00
dmi: Firmware registration failed.
Advanced Linux Sound Architecture Driver Initialized.
Bluetooth: Core ver 2.22
cpufreq: driver osm-cpufreq up and running
clk: clk_cpu_osm_driver_probe: OSM CPUFreq driver inited
reg-fixed-voltage 1.gpio-regulator: could not find pctldev for node /soc/qcom,spmi@c440000/qcom,pm8998@0/pinctrl@c000/camera_rear_dvdd_en/camera_rear_dvdd_
en_default, deferring probe
reg-fixed-voltage 2.gpio-regulator: could not find pctldev for node /soc/qcom,spmi@c440000/qcom,pm8998@0/pinctrl@c000/camera_dvdd_en/camera_dvdd_en_default
, deferring probe
SELinux: Registering netfilter hooks
...
usbserial: USB Serial support registered for FTDI USB Serial Device
usbserial: USB Serial support registered for GSM modem (1-port)
# Seems to have a lot of stuff in the kernel that isn't needed.
ALSA device list:
No soundcards found.
# But does it matter?
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=106 sclass=netlink_route_socket pig=605 comm=systemd-network
wlan: module is from the staging directory, the quality is unknown, you have been warned.
usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB0
option 1-1.1:1.1: GSM modem (1-port) converter detected
usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB1
option 1-1.1:1.2: GSM modem (1-port) converter detected
usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB2
option 1-1.1:1.3: GSM modem (1-port) converter detected
usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB3
qmi_wwan 1-1.1:1.4: cdc-wdm0: USB WDM device
```

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# Proprietary Comma AI
The Comma AI appears at first to be quite "open", but it is built upon
a lot of proprietary infrastruction. For example, in the docs on using
`ssh` to access the device, step one:
```
1. You need a GitHub account. Make one if you don't already have one.
```
From: https://github.com/commaai/openpilot/wiki/SSH
So despite being "open", work will need to be done to use this device
without proprietary tools. I'm guessing this issue will be found throughout
the toolchain as I dig deeper. It already needs a libre fork.
Perhaps a list starting here of proprietary parts:
* OpenSSH access to the device "needs" a Github account.
* Development on Github.
* Discord for chat.
* SSH on the device uses Microsoft proxy.
* Also has GSM device, doing who-knows-what.

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# Comma Three Security
Small notes on Comma Three security.
# SSH Remote Access
It appears from their docs that most users connect to their device
using ssh with the hostname `ssh.comma.ai` which resolves to
`104.214.96.241`, with the whois record showing the owner as
`Microsoft Corporation (MSFT)`.
So basically the device phones home to Microsoft.
# SSH Keys
On the device, the root filesystem is mounted read-only.
There is a `/persist` directory that contains some SSH RSA
keys:
```
root@tici:~# date ; ls -Rl /persist/
Sun 23 Jan 2022 02:30:39 AM UTC
/persist/:
total 4
drwxrwxr-x 2 comma comma 4096 Jan 14 23:41 comma
/persist/comma:
total 8
-rw------- 1 comma comma 1679 Jan 14 23:41 id_rsa
-rw-rw-r-- 1 comma comma 451 Jan 14 23:41 id_rsa.pub
```
The keys were created before the device shipped, not on first
boot, if the file timestamp is correct. So that ssh key
is in cleartext through the supply chain.
## Uh
Ok, this is perhaps even more absurd reading the docs:
```
1. Download the private key from the openpilot repo.. Save the key file as a text file and name it something like key.pem.
```
From: https://github.com/commaai/openpilot/wiki/SSH
That key:
https://raw.githubusercontent.com/commaai/openpilot/master/tools/ssh/id_rsa
```
-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----
```
I don't get how this isn't a really bad idea.
A shared ssh private key to many systems,
shared publicly?
More ssh key fun:
```
root@tici:~# grep ssh_host_ /etc/ssh/sshd_config
HostKey /data/etc/ssh/ssh_host_rsa_key
HostKey /data/etc/ssh/ssh_host_dsa_key
HostKey /data/etc/ssh/ssh_host_ecdsa_key
HostKey /data/etc/ssh/ssh_host_ed25519_key
root@tici:~# ls -l /data/etc/ssh/ssh_host_*
-rw------- 1 root root 1373 Sep 7 18:37 /data/etc/ssh/ssh_host_dsa_key
-rw-r--r-- 1 root root 599 Sep 7 18:37 /data/etc/ssh/ssh_host_dsa_key.pub
-rw------- 1 root root 505 Sep 7 18:37 /data/etc/ssh/ssh_host_ecdsa_key
-rw-r--r-- 1 root root 171 Sep 7 18:37 /data/etc/ssh/ssh_host_ecdsa_key.pub
-rw------- 1 root root 399 Sep 7 18:37 /data/etc/ssh/ssh_host_ed25519_key
-rw-r--r-- 1 root root 91 Sep 7 18:37 /data/etc/ssh/ssh_host_ed25519_key.pub
-rw------- 1 root root 2590 Sep 7 18:37 /data/etc/ssh/ssh_host_rsa_key
-rw-r--r-- 1 root root 563 Sep 7 18:37 /data/etc/ssh/ssh_host_rsa_key.pub
```
Those keys were generated at factory. Shared?
```
root@tici:~# sha256sum /data/etc/ssh/ssh_host_*
27f51bad028a16a44570590feb04ef82f58d2be85fd617619f0586f2c73a62b6 /data/etc/ssh/ssh_host_dsa_key
66ed353232f9826b51a4c95590e1b9246b7dfd9ff642c6a5a54bfcc90fdd7519 /data/etc/ssh/ssh_host_dsa_key.pub
441b79400802b9a0947f93383cd83fb2a3ed67b0c12b12b9b98c5c3e444bdc7e /data/etc/ssh/ssh_host_ecdsa_key
9dfcbed0ddb3dcbc151375c96b4077ac401a97ea86d82953d178cbf92fe6cadc /data/etc/ssh/ssh_host_ecdsa_key.pub
d7e7b3256dcf3f8a334f6bd68c5bf37b29d102a2952deea9902f3ad9accce140 /data/etc/ssh/ssh_host_ed25519_key
6df70068291b69055c969cc721025cc78ec49b34f210b3496584a20a49df8100 /data/etc/ssh/ssh_host_ed25519_key.pub
ba8b445792f1216ab53cdf34bce275bce956387b0f9874f515500e30cfdfb361 /data/etc/ssh/ssh_host_rsa_key
750f22eb6d020497f5a1c846f48bde33c7efb55479217b95103a7ebdb1136414 /data/etc/ssh/ssh_host_rsa_key.pub
```
# Listening
Listening TCP ports.
```
root@tici:~# netstat -pant
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 127.0.0.53:53 0.0.0.0:* LISTEN 3957/systemd-resolv
tcp 0 0 0.0.0.0:8022 0.0.0.0:* LISTEN 7655/sshd: /usr/sbi
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 7655/sshd: /usr/sbi
tcp6 0 0 :::8022 :::* LISTEN 7655/sshd: /usr/sbi
tcp6 0 0 :::22 :::* LISTEN 7655/sshd: /usr/sbi
# Looks like a local DNS resolver and ssh is listening on two ports:
root@tici:~# grep Port /etc/ssh/sshd_config
Port 8022
Port 22
```
Listening UDP.
```
root@tici:~# netstat -panu
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
udp 0 0 127.0.0.53:53 0.0.0.0:* 3957/systemd-resolv
udp 0 0 127.0.0.1:323 0.0.0.0:* 5508/chronyd
udp6 0 0 ::1:323 :::* 5508/chronyd
```
So local DNS resolver is listening for both tcp/udp and time sync
with `chrony`.
`IPv6` is in use.
# Filesystem
```
# /var filesystem is at 100%, maybe logfiles gone wild.
root@tici:~# df -h /var/
Filesystem Size Used Avail Use% Mounted on
tmpfs 128M 128M 0 100% /var
```
The `/var` mount does not appear to be just a temp mount, there
are old files there, e.g.:
```
root@tici:~# head /var/log/syslog.1
Sep 7 18:37:27 tici kernel: [ 0.000000] Booting Linux on physical CPU 0x0
```
# Random, or not?
Surely deterministic random numbers are secure?
```
root@tici:~# ls -l /var/lib/systemd/random-seed
-rw------- 1 root root 512 Sep 7 18:37 /var/lib/systemd/random-seed
```

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# Serial Access to Comma Three
Charge the device fully without booting it (e.g. as when ded).
I used Pine64 PinePower charger with USB-C.
Note, this device appears to be very sensitive to cable quality
and length. So far the only cable that has worked has been the
short thick USB-C cable that shipped with the unit.
```
# USB device connects with serial FTDI.
# 115200 8N1, no flow control
minicom -D /dev/ttyUSB0
```
Root user is `comma`. Not sure what password is, but I logged in so
it was something easy if it is set. The `comma` has `sudo` access.