Install the Yubikey PAM modules

install_pam_yubico.sh

yum install git -y
yum install gcc {auto,}make autoconf libtool -y
yum install {,lib}curl {lib{curl,usb},pam}-devel -y
cd /usr/src
git clone git://github.com/Yubico/yubico-pam.git
git clone git://github.com/Yubico/yubico-c.git
git clone git://github.com/Yubico/yubico-c-client.git
git clone git://github.com/Yubico/yubikey-personalization.git
cd /usr/src/yubico-c
autoreconf --install && ./configure && make && make install
cd /usr/src/yubico-c-client
autoreconf --install && ./configure && make && make install
cd /usr/src/yubikey-personalization
git checkout fd4d73e69c51422e3991ead828804129a701d0d
autoreconf --install && ./configure && make && make install
cd /usr/src/yubico-pam
autoreconf --install
PKG_CONFIG_PATH=/usr/local/lib/pkgconfig/:$PKG_CONFIG_PATH ./configure --without-ldap
PKG_CONFIG_PATH=/usr/local/lib/pkgconfig/:$PKG_CONFIG_PATH make && make install
mv /usr/local/lib/security/pam_yubico.{so,la} /lib64/security/
cd /etc/pam.d
vim sshd system-auth{,-ac} common-auth