...
host.name=www.ideasoft.biz
o3.cas.server.host=${host.name}
o3.base.url= https://${host.name}
liferay.host=${host.name}
cas.login.url=https://${o3.cas.server.host}/cas/login
cas.logout.url=https://${o3.cas.server.host}/cas/logout?service=https://${liferay.host}/eportal
<o3>/liferay/tomcat/webapps/eportal/WEB-INF/web.xml
...