tem uma outra maneira que o resultar é o mesmo: somente o administrador poderá criar um site. Segue onde deve ser alterado:
tomcat/webapps/alfresco/WEB-INF/classes/alfresco
faça uma copia do arquivo: public-services-security-context.xml file
sudo cp public-services-security-context.xml public-services-security-context.xml.original
Edit the public-services-security-context.xml file
sudo vi public-services-security-context.xml
faça as modificações conforme as linhas que estão em bold
<!– ============ –>
<!– Site Service –>
<!– ============ –>
<bean id="SiteService_security" class="org.alfresco.repo.security.permissions.impl.acegi.MethodSecurityInterceptor">
<property name="authenticationManager"><ref bean="authenticationManager"/></property>
<property name="accessDecisionManager"><ref local="accessDecisionManager"/></property>
<property name="afterInvocationManager"><ref local="afterInvocationManager"/></property>
<property name="objectDefinitionSource">
<value>
org.alfresco.service.cmr.site.SiteService.cleanSitePermissions=ACL_NODE.0.sys:base.ReadProperties
org.alfresco.service.cmr.site.SiteService.createContainer=ACL_ALLOW,AFTER_ACL_NODE.sys:base.ReadProperties
<b>org.alfresco.service.cmr.site.SiteService.createSite=ACL_METHOD.ROLE_ADMINISTRATOR</b>
org.alfresco.service.cmr.site.SiteService.deleteSite=ACL_ALLOW
org.alfresco.service.cmr.site.SiteService.findSites=ACL_ALLOW,AFTER_ACL_NODE.sys:base.ReadProperties
org.alfresco.service.cmr.site.SiteService.getContainer=ACL_ALLOW,AFTER_ACL_NODE.sys:base.ReadProperties
org.alfresco.service.cmr.site.SiteService.getMembersRole=ACL_ALLOW
org.alfresco.service.cmr.site.SiteService.getSite=ACL_ALLOW,AFTER_ACL_NODE.sys:base.ReadProperties
org.alfresco.service.cmr.site.SiteService.getSiteGroup=ACL_ALLOW
org.alfresco.service.cmr.site.SiteService.getSiteRoleGroup=ACL_ALLOW
org.alfresco.service.cmr.site.SiteService.getSiteRoles=ACL_ALLOW
org.alfresco.service.cmr.site.SiteService.getSiteRoot=ACL_ALLOW,AFTER_ACL_NODE.sys:base.ReadProperties
org.alfresco.service.cmr.site.SiteService.hasContainer=ACL_ALLOW
org.alfresco.service.cmr.site.SiteService.hasCreateSitePermissions=ACL_ALLOW
org.alfresco.service.cmr.site.SiteService.isMember=ACL_ALLOW
org.alfresco.service.cmr.site.SiteService.listMembers=ACL_ALLOW
org.alfresco.service.cmr.site.SiteService.listSites=ACL_ALLOW,AFTER_ACL_NODE.sys:base.ReadProperties
org.alfresco.service.cmr.site.SiteService.removeMembership=ACL_ALLOW
org.alfresco.service.cmr.site.SiteService.setMembership=ACL_ALLOW
org.alfresco.service.cmr.site.SiteService.updateSite=ACL_ALLOW
org.alfresco.service.cmr.site.SiteService.*=ACL_<b>ALLOW</b>
</value>
</property>
</bean>
Restarte o Alfresco e qualquer usuário comum não terá permissão para criar site. Administrador pode criar.