66 lines
1.6 KiB
Bash
66 lines
1.6 KiB
Bash
#!/bin/sh
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set -e
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# Analogous to Debian's ISC cron postinst script (for compatibility reasons)
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crondir="/var/spool/cron"
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action="$1"
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if [ "$action" != configure ]
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then
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exit 0
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fi
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# Make sure group "crontab" exists (needed for running SGID)
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getent group crontab > /dev/null 2>&1 || addgroup --system crontab
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# Make crontab(1) SGID
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if ! dpkg-statoverride --list /usr/bin/crontab > /dev/null
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then
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dpkg-statoverride --update --add root crontab 2755 /usr/bin/crontab
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fi
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# Adjust permissions for spool dir
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# Can't use dpkg-statoverride for this because it doesn't cooperate nicely
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# with cron alternatives such as bcron
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if [ -d $crondir/crontabs ]
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then
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# This must be in sync with misc.c:check_spool_dir()
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chown root:crontab $crondir/crontabs
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chmod 1730 $crondir/crontabs
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cd $crondir/crontabs
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set +e
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# Iterate over each entry in the spool directory, perform some sanity
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# checks (see CVE-2017-9525), and chown/chgroup the crontabs
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for tab_name in *
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do
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[ "$tab_name" = "*" ] && continue
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tab_links=`stat -c '%h' "$tab_name"`
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tab_owner=`stat -c '%U' "$tab_name"`
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if [ ! -f "$tab_name" ]
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then
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echo "Warning: $tab_name is not a regular file!"
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continue
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elif [ "$tab_links" -ne 1 ]
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then
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echo "Warning: $tab_name has more than one hard link!"
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continue
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elif [ "$tab_owner" != "$tab_name" ]
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then
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echo "Warning: $tab_name name differs from owner $tab_owner!"
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continue
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fi
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chown "$tab_owner:crontab" "$tab_name"
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chmod 600 "$tab_name"
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done
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set -e
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fi
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#DEBHELPER#
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exit 0
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