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EGI central banning setup for NGI_IT sites

The purpose of deploying the central banning over sites is to implement the EGI CSIRT central emergency suspension policy.

In brief, EGI CSIRT can centrally ban suspected or compromised user and robot certificates whenever they can be used to submit jobs.

In case a certificate has undergone suspension procedure NGIs and sites security contact will be promptly informed.

The solution is based on the Argus service able to deal with ban policy for certificate DNs. A three level hierachy for Argus (EGI, NGI and site levels) allows to centrally (EGI level) define banning policy inherited by both NGI and site levels.

To take into account sites without Argus, the central banning setup considers the two following scenarios

Site with Argus

Enabling site Argus to read NGI Argus policy

In order to download the ban policy from the NGI Argus you have to ask to the NGI granting read access for your Argus's DN. Please submit a ticket to the NGI_IT support unit using the following template

Assign To NGI_IT
Subject Enable Argus server for site "SITENAME"
Description Please add the following Argus DN: "DN of your Argus server"

Once your Argus is granted with the proper privileges, sites can add the NGI_IT Argus as a remote Policy Administration Point (PAP).

NGI_IT Argus endpoint argus-it.cnaf.infn.it
NGI_IT Argus DN /C=IT/O=INFN/OU=Host/L=CNAF/CN=argus-it.cnaf.infn.it

Using pap-admin utility to add NGI_IT PAP to your Argus

Add NGI_IT PAP (aka ngi_it)

pap-admin add-pap ngi_it argus-it.cnaf.infn.it "/C=IT/O=INFN/OU=Host/L=CNAF/CN=argus-it.cnaf.infn.it"

Enable new NGI_IT PAP (aka ngi_it)

pap-admin enable-pap ngi_it

Make the new ngi_it PAP as the default one

pap-admin set-paps-order ngi_it default

Set polling interval to 1 hour (Please carefully consider this operation since can influence your Argus performances)

pap-admin set-polling-interval 600

Reload policy and clear cache

/etc/init.d/argus-pdp reloadpolicy
/etc/init.d/argus-pepd clearcache
Verify new remote policy by using --all option with pap-admin client

pap-admin lp --all

Preventing yaim overwrites for added PAPs

Yaim is unable to configure and add new PAPs (no yaim variables provided) so running yaim on the Argus server can potentially remove added PAPs. To avoid such situation sites should perform the procedure to add NGI_IT PAP everytime they run yaim on the Argus server. You can script the procedure or use a configuration management tool like Puppet to automate such procedure.

Site without Argus

Site without Argus server can download the ban policy file publicly available here and integrate it with local site policy.

Such file will comprise the list of EGI and/or NGI banned DNs and needs to be stored in the CREAM CE ban file located at /etc/lcas/ban_users.db Site can cron the download to have it schedelued in the background. The following snippet can be considered as a proof of concept of the cron:

cat /etc/cron.d/fetch-banlist

# Fetch ban list from central NGI repository
# and add DNs to ban_users.db file

0  *  *  *  *  root (sleep $(($RANDOM\%40+10))) && http_status=$(curl -sL -w '\%{http_code}' --connect-timeout 60 --capath /etc/grid-security/certificates/ --cert /etc/grid-security/hostcert.pem --key /etc/grid-security/hostkey.pem https://repo-cnaf.cnaf.infn.it/pub/banlist/ban_users.db -o /dev/null); [ $http_status -eq 200 ] && (curl -s --connect-timeout 60 --capath /etc/grid-security/certificates/ --cert /etc/grid-security/hostcert.pem --key /etc/grid-security/hostkey.pem https://repo-cnaf.cnaf.infn.it/pub/banlist/ban_users.db -o /etc/lcas/ban_users.db)
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Topic revision: r6 - 2014-01-20 - GiuseppeMisurelli
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