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by unavailable accounts, e.g., those locked, expired, not allowed in at the moment by nologin(5), or whatever, depending on cron's pam.conf(5). This applies to personal crontabs only, /etc/crontab is unaffected. In other words, now the account management policy will apply to commands scheduled by users via crontab(1) so that a user can no longer use cron(8) to set up a delayed backdoor and run commands during periods when the admin doesn't want him to. The PAM check is done just before running a command, not when loading a crontab, because accounts can get locked, expired, and re-enabled any time with no changes to their crontabs. E.g., imagine that you provide a system with payed access, or better a cluster of such systems with centralized account management via PAM. When a user pays for some days of access, you set his expire field respectively. If the account expires before its owner pays more, its crontab commands won't run until the next payment is made. Then it'll be enough to set the expire field in future for the commands to run again. And so on. Document this change in the cron(8) manpage, which includes adding a FILES section and touching the document date. X-Security: should benefit as users have access to cron(8) by default
10 lines
135 B
Plaintext
10 lines
135 B
Plaintext
#
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# $FreeBSD$
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#
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# PAM configuration for the "cron" service
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#
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# account
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account required pam_nologin.so
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account required pam_unix.so
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