I really like this feature - no more USB tokens (forgotten at home when I need them 
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OpenPGP allows encrypting emails, correct?
Is there more I can do with a OpenPGP card?
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Really interesting to see that the Librem Key isn’t “pretty much” a smart card or just “recognized by the computer” as a smart card - it’s literally a smart card on a chip to enable interfacing over USB.
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I use it with a smartcard for my Laptop (instead of a password) for:
-) Login / sudo
-) Authentication when doing SSH
-) Decrypting my LUKS Partition
-) Decrypting my password store
This is all protected with the smartcard. So only 3 tries to enter the correct smartcard pin.
Then the card ist locked and needs the admin pin (6 tries).
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As some users stated - would have been interested to see also what can be done on a librem 5 with an OpenPGP or what is planned to be possible. (Like the things @Cc281080 writes)
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… and how to do it?
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Will I be able to move the card from the Librem Key to the phone, and then use the phone as a librem key? Meaning, connect the phone to a computer, and then have access to the the gpg-key on the computer?
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I just started to test the integrated smartcard reader.
Downside for now:
As soon as I followed the description in the news my smartcard in my external card reader ist not used anymore.
I will program a small smartcard to test my How Tos with the internal smartcard reader.
I will Post the description if I have then verified in the Librem5.
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Here are some of our plans for the future:
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My description for SSH via SmartCard
Just tested it on my Librem5
On Client
vi .gnupg/gpg-agent.conf
enable-ssh-support
vi ~/.bashrc
export SSH_AUTH_SOCK=$(gpgconf --list-dirs agent-ssh-socket)
gpgconf --launch gpg-agent
reboot System
get SSH Key for Server authorized_keys
ssh-add -L
On Server paste SSH key
vi ~/.ssh/authorized_keys
Deactivate login on server via password (optional)
vi /etc/ssh/sshd_config
PasswordAuthentication no
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No, if you remove the smart card from the Librem Key and put it in the Librem 5’s smart card reader, you won’t be able to connect the Librem 5 to your computer over USB-C and use it like a Librem Key.
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Create Password store (with TOMB) on Laptop (tested on Debian)
su -
apt install pass-extension-tomb
adduser [Username] sudo
exit
Reboot to take effect
sudo swapoff -a
gpg --list-keys
pass tomb [gpg-id] -v -d
Workaround if error: cryptsetup luksFormat returned an error.
You need to remove the already generated .password.tomb
rm -rf .password.tomb*
Then you need to add “–type luks1” in tomb when the “cryptsetup” is called
sudo vi /usr/bin/tomb
/_cryptsetup(
sudo cryptsetup --type luks1 --key-file - ${@}
Copy the password store to the Librem5
apt install pass-extension-tomb
The following two files need to be copied to the librem5
~/.password.tomb
~/.password.tomb.key
Use a GUI for managing the passwords (optional)
On Matrix I read about another GUI for “pass” also writen in python but currently without support for pass-tomb.
I haven’t tested the other GUI and don’t have a link to it. But maybe some one can post it.
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When I enter the pin the smartcard doesn’t ask for it anymore. An external card reader can be removed and reinserted into USB port.
Is there a way/command to do it with the integrated smartcard reader?
So that I would have to enter the pin again.
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I think what you are seeing is a GPG session token being cached. I forget what the initial timeout is (a few minutes I believe) before GPG will prompt you again for the PIN. I’m sure it’s configurable though.
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$ cat $GNUPGHOME/gpg-agent.conf
enable-ssh-support
max-cache-ttl 600
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I see now (having the card in my L5) that the above value does not bring the card into locked state again. For the moment I only use killing the gpg-agent process.
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I’m about to order my phone…Can someone please help me understand this?? Will I be able to put this in an Evergreen L5 for PGP stuff (signing, encrypting, etc)? I assume so, since its being offered as an L5 accessory? Just trying to determine if I want to get one with my order.
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Yes. The OpenPGP card works nice with the L5. Here is my small how to set it up:
How to setup the OpenPGP card in the Purism L5 phone
guru@unixarea.de, October 2021
https://puri.sm/posts/openpgp-in-your-pocket/
(includes video about inserting the card)
https://source.puri.sm/angus.ainslie/ttxs-firmware/-/blob/purism/PURISM.md
install and get the software:
$ cd ~/guru
$ sudo apt install stm32flash git
$ git clone https://source.puri.sm/angus.ainslie/ttxs-firmware
$ cd ttxs-firmware
Upgrade the smart card reader firmware:
$ ./scripts/stm_reflash.sh
...
stm32flash 0.5
http://stm32flash.sourceforge.net/
Using Parser : Raw BINARY
Interface serial_posix: 57600 8E1
Version : 0x31
Option 1 : 0x00
Option 2 : 0x00
Device ID : 0x0435 (STM32L43xxx/44xxx)
- RAM : Up to 48KiB (12544b reserved by bootloader)
- Flash : Up to 256KiB (size first sector: 1x2048)
- Option RAM : 16b
- System RAM : 28KiB
Write to memory
Erasing memory
Wrote address 0x08002388 (100.00%) Done.
And set up the smart card:
$ ./scripts/smartcard_setup.sh
There have been issues, see also:
https://forums.puri.sm/t/openpgp-card-waiting-for-the-first-reader/15189
https://source.puri.sm/Librem5/OS-issues/-/issues/119
What helped was:
# stty -F /dev/ttymxc2 raw cstopb -parenb cs8 115200
# pcscd -f --debug
The startup of pcscd is to be configured here and start is via systemctl:
# vim /lib/systemd/system/pcscd.service
# systemctl status pcscd
# systemctl stop pcscd
# systemctl start pcscd
Setting up the card
$ gpg --card-status
Reader ...........: TTXS serial 00 00
Application ID ...: D27600012401030400050000A6FE0000
Application type .: OpenPGP
Version ..........: 3.4
Manufacturer .....: ZeitControl
Serial number ....: 0000A6FE
Name of cardholder: [not set]
Language prefs ...: de
Salutation .......:
URL of public key : [not set]
Login data .......: [not set]
Signature PIN ....: forced
Key attributes ...: rsa2048 rsa2048 rsa2048
Max. PIN lengths .: 64 64 64
PIN retry counter : 3 0 3
Signature counter : 0
KDF setting ......: off
Signature key ....: [none]
Encryption key....: [none]
Authentication key: [none]
General key info..: [none]
$ gpg --change-pin # changed the PIN and Admin PIN
$ gpg --card-edit # generated the keys
$ export GNUPGHOME=/home/guru/.gnupg
$ pass init 'CCID L5'
Password store initialized for guru@unixarea.de
$ pass insert -m test
...
$ gpg --with-keygrip -K
/home/purism/.gnupg/pubring.kbx
-------------------------------
sec> rsa2048 2021-10-30 [SC]
336EB96892FE9FE7F6AD01D6529B7423F3608141
Keygrip = FCBA9E53DF1AF8D6E8D82B0418A01FA33264F704
Card serial no. = 0005 0000A6FE
uid [ultimate] Matthias Apitz (GnuPG CCID L5) <guru@unixarea.de>
ssb> rsa2048 2021-10-30 [A]
Keygrip = EE34E2B1F932D1567A6E21023F4D65B71CF953FF
ssb> rsa2048 2021-10-30 [E]
Keygrip = C544F16750F7F55DCEF781CF57C232015DDF1F90
the '>' means that these keys are on the card;
export the pub key with:
$ gpg --export --armor > ccid-L5-export-key-guru.pub
lock the card again:
$ gpgconf --reload scdaemon
I added this to the pass cmd:
$ tail -8 /usr/bin/pass
# power down the OpenPGP card
# guru@unixarea.de
#
gpgconf --reload scdaemon
sleep 2
exit 0
so the card gets loecked again after each operation with the pass cmd.
4 Likes
Awesome!! Thank you so much, very helpful!
1 Like