03.25.05
debian logcheck nonsense
linux at 12:51 pm by JamesFor a while now I’ve been getting spammed by logcheck running on one of the servers i maintain. I had upgraded some random packages, and now started getting the following consistent messages:
Mar 25 14:23:01 localhost cron(pam_unix)[3477]: session opened for user mail by (uid=0)
Mar 25 14:23:01 localhost cron(pam_unix)[3477]: session closed for user mail
It turns out that sometime from pam .76-14 to pam .76-22 (the libpam-modules package in particular), the format of libpam reporting was changed to:
Mar 25 14:39:01 localhost CRON[3581]: (pam_unix) session opened for user root by (uid=0)
Mar 25 14:39:01 localhost CRON[3581]: (pam_unix) session closed for user root
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^\w{3} [ :0-9]{11} [._[:alnum:]-]+ cron\(pam_[[:alnum:]]+\)\[[0-9]+\]: session opened for user [[:alnum:]-]+ by \(uid=[0-9]+\)$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ cron\(pam_[[:alnum:]]+\)\[[0-9]+\]: session closed for user [[:alnum:]-]+$
To test the regex:
egrep -v -f rules/ignore.d.paranoid/cron < test2.log
assuming the rule is in the file cron, and test2.log is a sample of the log output. Another interesting tidbit of logcheck, is that it always runs all *more* restrictive rules.. ie “server” implicitly includes “paranoid” and “workstation” includes “server”.
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