Common Access Card
This page explains how to setup Arch to use a US Department of Defense Common Access Card (CAC).
Install official repositories.and from
If your card reader does not have a pin pad, uncomment
enable_pinpad = false in
card_drivers = cac and
force_card_driver = cac
Start and enable
2. Download certs: "Trust Store" -> "PKI CA Certificate Bundles: PKCS#7" -> "For DoD PKI Only - Version 5.3" (ZIP Download)
3. Unzip the DoD PKI zip
4. Follow browser-specific instructions
Load security device
Navigate to Edit -> Preference -> Advanced -> Certificates -> Security Devices and click "Load" to load a module using
Import the DoD Certificates
Install the certificates from the mentioned zip-file in this order, by going to Edit -> Preference -> Advanced -> Certificates -> View Certificates -> Authorities -> Import (make sure to at-least check the box for "Trust this CA to identify websites"):
1. Add the CAC Module to the NSS DB.
Ensure that your CAC is connected, that Chromium is closed and enter the following in a terminal:
$ modutil -dbdir sql:$HOME/.pki/nssdb/ -add "CAC Module" -libfile /usr/lib/opensc-pkcs11.so
Upon success you will see "Module "CAC Module" added to database."
2. Check if the CAC Module was successfully added with
$ modutil -dbdir sql:$HOME/.pki/nssdb/ -list
3. Navigate (in a shell) to the location of the unzip DoD PKI files and install via:
for n in $(ls * | grep Chrome); do certutil -d sql:$HOME/.pki/nssdb -A -t TC -n $n -i $n; done
Re-open Chrome, Navigate to Settings -> Show Advanced Settings -> Manage Certificates -> Authorities to load CA bundle from the PEM-formatted file from above.
4. Verify the authority is in Chrome under Settings -> Show Advanced Settings -> Manage Certificates -> Authorities then expand "org-U.S. Government" and you should see a number of "DoD" certificates listed.
Visit your favorite CAC secured web page and you should be asked for the Master Password for your certificate. Enter it and if you get in, you know it's working.
If some sites/pages seem to have a problem working correctly (e.g. outlook web access won't authenticate the session for DoD webmail) try using a private/incognito session to test validity of the cert chain and remove some variables.
Most of this information was found in a blog post by Firas Kraïem
Verify opensc can see your reader
$ opensc-tool --list-readers
# Detected readers (pcsc) Nr. Card Features Name 0 Yes Generic USB2.0-CRW [Smart Card Reader Interface] (20070818000000000) 00 00
List plugged in card
$ opensc-tool --reader 0 --name
Personal Identity Verification Card
List plugged in card and drive in use
$ opensc-tool --reader 0 --name -v
Connecting to card in reader Generic USB2.0-CRW [Smart Card Reader Interface] (20070818000000000) 00 00... Using card driver Personal Identity Verification Card. Card name: Personal Identity Verification Card
pcsc_scan may be helpful
[cceleri@ender ~]$ pcsc_scan PC/SC device scanner V 1.4.21 (c) 2001-2011, Ludovic Rousseau <email@example.com> Compiled with PC/SC lite version: 1.8.6 Using reader plug'n play mechanism Scanning present readers... 0: Dell Dell Smart Card Reader Keyboard 00 00 Thu Sep 5 10:41:53 2013 Reader 0: Dell Dell Smart Card Reader Keyboard 00 00 Card state: Card removed, Thu Sep 5 10:41:58 2013 Reader 0: Dell Dell Smart Card Reader Keyboard 00 00 Card state: Card inserted, ATR: 3B DB 96 00 80 1F 03 00 31 C0 64 B0 F3 10 00 07 90 00 80 ATR: 3B DB 96 00 80 1F 03 00 31 C0 64 B0 F3 10 00 07 90 00 80 + TS = 3B --> Direct Convention + T0 = DB, Y(1): 1101, K: 11 (historical bytes) TA(1) = 96 --> Fi=512, Di=32, 16 cycles/ETU 250000 bits/s at 4 MHz, fMax for Fi = 5 MHz => 312500 bits/s TC(1) = 00 --> Extra guard time: 0 TD(1) = 80 --> Y(i+1) = 1000, Protocol T = 0 ----- TD(2) = 1F --> Y(i+1) = 0001, Protocol T = 15 - Global interface bytes following ----- TA(3) = 03 --> Clock stop: not supported - Class accepted by the card: (3G) A 5V B 3V + Historical bytes: 00 31 C0 64 B0 F3 10 00 07 90 00 Category indicator byte: 00 (compact TLV data object) Tag: 3, len: 1 (card service data byte) Card service data byte: C0 - Application selection: by full DF name - Application selection: by partial DF name - EF.DIR and EF.ATR access services: by GET RECORD(s) command - Card with MF Tag: 6, len: 4 (pre-issuing data) Data: B0 F3 10 00 Mandatory status indicator (3 last bytes) LCS (life card cycle): 07 (Operational state (activated)) SW: 9000 (Normal processing.) + TCK = 80 (correct checksum) Possibly identified card (using /usr/share/pcsc/smartcard_list.txt): 3B DB 96 00 80 1F 03 00 31 C0 64 B0 F3 10 00 07 90 00 80 DoD CAC, Oberthur ID One 128 v5.5 Dual