FreeRadius + FreeIPA

# create keytab for radius user
ipa-getkeytab -p 'radius/HOSTNAME' -k /etc/raddb/radius.keytab
chown root:radiusd /etc/raddb/radius.keytab
chmod 640 /etc/raddb/radius.keytab

# make radius use the keytab for SASL GSSAPI
mkdir -p /etc/systemd/system/radiusd.service.d
cat > /etc/systemd/system/radiusd.service.d/krb5_keytab.conf << EOF
[Service]
Environment=KRB5_CLIENT_KTNAME=/etc/raddb/radius.keytab
ExecStartPre=-/usr/bin/kdestroy -A
ExecStopPost=-/usr/bin/kdestroy -A
EOF
systemctl daemon-reload

edit /etc/raddb/mods-enabled/ldap
ldap server = 'LDAP HOSTNAME'
ldap base_dn = 'cn=accounts,dc=example,dc=org'
ldpa sasl mech = 'GSSAPI'
ldpa sasl realm = 'YOUR REALM'
ldap sasl update control:NT-Password := 'ipaNTHash'

# certs
mv /etc/raddb/certs /etc/raddb/certs.bak
mkdir /etc/raddb/certs
openssl dhparam 2048 -out /etc/raddb/certs/dh
ipa-getcert request -w -k /etc/pki/tls/private/radius.key -f /etc/pki/tls/certs/radius.pem -T caIPAserviceCert -C 'systemctl restart radiusd.service' -N HOSTNAME -D HOSTNAME -K radius/HOSTNAME