Debian

$ sudo apt-get install -y libpam0g-dev libcurl4-openssl-dev glib2.0
$ make && make install

Redhat / CentOS

$ sudo yum install pam-devel libcurl-devel glib2-devel
$ make && make install

Example /etc/pam.d/sudo file:

auth required pam_pivportal.so
account include system-auth
password include system-auth
session optional pam_keyinit.so revoke
session required pam_limits.so

Example /etc/pivportal.conf:

hosts - Hostname or IP Address of the server. Default is 127.0.0.1.

port - TCP Port to user to connect to the server. Default is 442.

client_ssl_cert - Client SSL certificate used by the pam_pivportal module to authenticate to the pivportal server. Default is /etc/ssl/certs/pivportalClient.pem.

ssl_verify_host - SSL verify server certificate is valid. 0 = false, 1 = true. Default is false.

[server]
hosts=192.16.0.1;test.yourhost.com
port=442
client_ssl_cert=/etc/ssl/certs/pivportalClient.pem
ssl_verify_host=0