Configuration the Linux Authentication System

In this section, the Tellaro’s PAM configuration is modified to require the strongauth user to authenticate on the Console with:

• The credential’s Linux password; and
• Security Key with USB Type -A connector

Steps

1. Log into the server as root user and open a new shell window

2. Remove the pre-installed libcbor and libfido2 libraries

   shell> rpm -ev --nodeps libcbor
   shell> rpm -ev --nodeps libfido2
   

3. Download libcbor 0.10.2 from the link below

   https://github.com/PJK/libcbor/archive/refs/tags/v0.10.2.zip

4. Extract the downloaded zip:

   shell> unzip libcbor-0.10.2.zip
   shell> mv libcbor-0.10.2 libcbor
   

5. Install prerequisites for building libcbor

   shell> yum install gcc
   shell> yum install g++

6. Build libcbor with Position Independent Code (PIV) set to on.

   shell> cmake -DCMAKE_BUILD_TYPE=Release libcbor -DCMAKE_POSITION_INDEPENDENT_CODE=ON
   shell> make
   shell> make install
   

   This will install the compiled files in ‘/usr/local/lib64’ directory.

7. Download libfido2 1.12 from the link below

   https://developers.yubico.com/libfido2/Releases/libfido2-1.12.0.tar.gz

8. Extract the downloaded distribution:

   shell> tar xvf libfido2-1.12.0.tar.gz
   

9. Install prerequisites for building libfido2

   shell> yum install zlib-devel
   shell> yum install openssl-devel

10. Change directory into the extracted folder and build libfido2:

    shell> cd libfido2-1.12.0
    shell> cmake -B build
    shell> make -C build
    shell> make -C build install
    

    This will install the compiled files in ‘/usr/local/lib64’ directory.

11. Create symbolic links to the newly compiled libraries in the ‘/usr/lib64’ folder:

    shell> ln -s /usr/local/lib64/libfido2.so.1.12.0 /usr/lib64/libfido2.so.1
    shell> ln -s /usr/local/lib64/libfido2.so.1 /usr/lib64/libfido2.so
    

12. Add a group named mfausers to /etc/group

    shell> groupadd mfausers
    

13. Add the strongauth account to the mfausers group

    shell> gpasswd --a strongauth mfausers
    

14. Create an empty file called /var/log/pamfido.log

    shell> touch /var/log/pamfido.log
    

15. Make the pamfido.log file write-able by the group

    shell> chmod 664 /var/log/pamfido.log