Hi community, I'm starting this discussion to share some ideas about XenServer integration in ACS. Since XenServer has some nice features to do that like RBAC, host plugin and XenStore, I demonstrate these to some community members at CCCEU14.
Some references you can look in these links: https://blog.xenproject.org/2011/11/09/xcp-rbac-and-pam-authentication-in-the-xenapi/ https://wiki.xenserver.org/index.php?title=RBAC http://wiki.xen.org/wiki/XAPI_Host_Plugins http://wiki.xen.org/wiki/XenStore Actual status in ACS: During the XenServer setup, is possible to define a user to connect to the xapi. In XenCenter, is possible to use a different user (no-root) using external authentication like AD our PAM since the RBAC is configured properly for this. In ACS it's not possible because many command need be called by root using SSH. Another issue in this approach is about security: root password is stored in DB and, in this approach we have a security compliance issue. The root used used to call shell scripts in the XenServer host are all hard-coded. What we can do? - Substitute host SSH connection to XAPI host plugins In my view, I prefer use just one-way to connect to XenServer, in this case, changing host SSH interactions to use exclusively XAPI. XAPI implements Host Plugins where could be used to as a security layer to call commands into host. An example of host plugin: # cat xen_plugin_demo #!/usr/bin/python import XenAPIPlugin import subprocess def main(session, args): try: p = subprocess.Popen(args["cmd"].split(" "), stdout=subprocess.PIPE, stderr=subprocess.PIPE) out, err = p.communicate() return out except KeyError: raise RuntimeError("No argument found with key.") if __name__ == "__main__": XenAPIPlugin.dispatch({"main": main}) And a client: $ cat call_plugin.py import XenAPI import sys session = XenAPI.Session('https://192.168.56.12') session.login_with_password('cloud', 'password') host, = session.xenapi.host.get_all() print print session.xenapi.host.call_plugin(host, 'xen_plugin_demo', 'main', {'cmd' : " ".join(sys.argv[1:])}) Calling: $ python call_plugin.py ls /root add_roles.sh support.tar.bz2 - Setup RBAC to use a non-root to manage the XenServer host As a suggestion, for this approach, need to have a user pre-seted in PAM or configure XenServer AD. Follow what need be running in the XenServer shell to setup the user, external auth, associate RBAC role to this user: adduser cloudstack password cloudstack xe pool-enable-external-auth auth-type=PAM config:user=cloudstack service-name=CloudStack xe subject-add subject-name=cloudstack subject_uuid=$(xe subject-list | awk '/^uuid/{print $5}') role_uuid=$(xe role-list name=pool-admin params=uuid | awk '/^uuid/{print $5}') xe subject-role-add uuid=${subject_uuid} role-uuid=${role_uuid} We can in this case, maintain the scripts used today, needing change the way to call them from ACS. Best regards, Marco Sinhoreli Consultant Manager [cid:4ED26AB2-F780-4A47-A562-29FA916D6FE6] Phone: +55 21 2586 6390 | Fax: +55 21 2586 6002 | Mobile: +55 21 98276 3636 | Mobile: +55 21 99711 4645 Praia de Botafogo 501, bloco 1 - sala 101, Botafogo, Rio de Janeiro, RJ - Brazil - CEP 22250-040 marco.sinhor...@shapeblue.com<mailto:marco.sinhor...@shapeblue.com> | www.shapeblue.com<http://www.shapeblue.com/> | Twitter:@shapeBlue<https://twitter.com/#!/shapeblue> Find out more about ShapeBlue and our range of CloudStack related services IaaS Cloud Design & Build<http://shapeblue.com/iaas-cloud-design-and-build//> CSForge - rapid IaaS deployment framework<http://shapeblue.com/csforge/> CloudStack Consulting<http://shapeblue.com/cloudstack-consultancy/> CloudStack Software Engineering<http://shapeblue.com/cloudstack-software-engineering/> CloudStack Infrastructure Support<http://shapeblue.com/cloudstack-infrastructure-support/> CloudStack Bootcamp Training Courses<http://shapeblue.com/cloudstack-training/> This email and any attachments to it may be confidential and are intended solely for the use of the individual to whom it is addressed. Any views or opinions expressed are solely those of the author and do not necessarily represent those of Shape Blue Ltd or related companies. If you are not the intended recipient of this email, you must neither take any action based upon its contents, nor copy or show it to anyone. Please contact the sender if you believe you have received this email in error. Shape Blue Ltd is a company incorporated in England & Wales. ShapeBlue Services India LLP is a company incorporated in India and is operated under license from Shape Blue Ltd. Shape Blue Brasil Consultoria Ltda is a company incorporated in Brasil and is operated under license from Shape Blue Ltd. ShapeBlue SA Pty Ltd is a company registered by The Republic of South Africa and is traded under license from Shape Blue Ltd. ShapeBlue is a registered trademark.
