Re: Cron

On Fri, 5 Oct 2001, Westerman, Mark wrote:

> When I place the backup in the crontab it will not execute.
> I get an ENTRYPOINT error on the crontab file for amanda.

The cron daemon was modified to check entrypoint permission between the user's cron job security context (from /etc/security/cron_context) and the security context on the crontab file. This simulates the checking that would occur if a crontab file were an executable script rather than a configuration file. It is done to ensure that a low integrity crontab is not executed by a privileged user's cron job. Otherwise, a superuser process in an unprivileged domain could potentially create a bogus crontab for a privileged user.

Notice that the crontab program domains
(policy/domains/program/crontab.te) are set up to automatically label user crontab files with a derived type based on user domain that ran the crontab program. For example, if a user_t process runs crontab (thereby entering user_crontab_t), the resulting crontab will labeled user_cron_spool_t and cannot be used for a sysadm_t cron job. What type are you using for your amanda domain's crontab files?

The crond domains (policy/domains/system/crond.te) are granted entrypoint permission to the appropriate crontab file type. The system_crond_t domain is granted entrypoint permission to system_crond_script_t, which is set for /etc/crontab and /etc/cron.d/* when you did the 'make relabel'. The user crond domains are granted entrypoint permission to the appropriate derived type, which is set when the crontab file is created as described above. Are you trying to run this job from one of the system crontab files or from the amanda user's crontab file? If the latter, what is the amanda user's security context in /etc/security/cron_context?

--
Stephen D. Smalley, NAI Labs
ssmalley@nai.com








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