<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:x="urn:schemas-microsoft-com:office:excel" xmlns:p="urn:schemas-microsoft-com:office:powerpoint" xmlns:a="urn:schemas-microsoft-com:office:access" xmlns:dt="uuid:C2F41010-65B3-11d1-A29F-00AA00C14882" xmlns:s="uuid:BDC6E3F0-6DA3-11d1-A2A3-00AA00C14882" xmlns:rs="urn:schemas-microsoft-com:rowset" xmlns:z="#RowsetSchema" xmlns:b="urn:schemas-microsoft-com:office:publisher" xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet" xmlns:c="urn:schemas-microsoft-com:office:component:spreadsheet" xmlns:odc="urn:schemas-microsoft-com:office:odc" xmlns:oa="urn:schemas-microsoft-com:office:activation" xmlns:html="http://www.w3.org/TR/REC-html40" xmlns:q="http://schemas.xmlsoap.org/soap/envelope/" xmlns:rtc="http://microsoft.com/officenet/conferencing" xmlns:D="DAV:" xmlns:Repl="http://schemas.microsoft.com/repl/" xmlns:mt="http://schemas.microsoft.com/sharepoint/soap/meetings/" xmlns:x2="http://schemas.microsoft.com/office/excel/2003/xml" xmlns:ppda="http://www.passport.com/NameSpace.xsd" xmlns:ois="http://schemas.microsoft.com/sharepoint/soap/ois/" xmlns:dir="http://schemas.microsoft.com/sharepoint/soap/directory/" xmlns:ds="http://www.w3.org/2000/09/xmldsig#" xmlns:dsp="http://schemas.microsoft.com/sharepoint/dsp" xmlns:udc="http://schemas.microsoft.com/data/udc" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:sub="http://schemas.microsoft.com/sharepoint/soap/2002/1/alerts/" xmlns:ec="http://www.w3.org/2001/04/xmlenc#" xmlns:sp="http://schemas.microsoft.com/sharepoint/" xmlns:sps="http://schemas.microsoft.com/sharepoint/soap/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:udcs="http://schemas.microsoft.com/data/udc/soap" xmlns:udcxf="http://schemas.microsoft.com/data/udc/xmlfile" xmlns:udcp2p="http://schemas.microsoft.com/data/udc/parttopart" xmlns:wf="http://schemas.microsoft.com/sharepoint/soap/workflow/" xmlns:dsss="http://schemas.microsoft.com/office/2006/digsig-setup" xmlns:dssi="http://schemas.microsoft.com/office/2006/digsig" xmlns:mdssi="http://schemas.openxmlformats.org/package/2006/digital-signature" xmlns:mver="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns:mrels="http://schemas.openxmlformats.org/package/2006/relationships" xmlns:spwp="http://microsoft.com/sharepoint/webpartpages" xmlns:ex12t="http://schemas.microsoft.com/exchange/services/2006/types" xmlns:ex12m="http://schemas.microsoft.com/exchange/services/2006/messages" xmlns:pptsl="http://schemas.microsoft.com/sharepoint/soap/SlideLibrary/" xmlns:spsl="http://microsoft.com/webservices/SharePointPortalServer/PublishedLinksService" xmlns:Z="urn:schemas-microsoft-com:" xmlns:tax="http://schemas.microsoft.com/sharepoint/taxonomy/soap/" xmlns:tns="http://schemas.microsoft.com/sharepoint/soap/recordsrepository/" xmlns:spsup="http://microsoft.com/webservices/SharePointPortalServer/UserProfileService" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:st="" xmlns="http://www.w3.org/TR/REC-html40"><head> <meta http-equiv="Content-Type" content="text/html; charset=us-ascii"> <meta name="Generator" content="Microsoft Word 14 (filtered medium)"> <style></style> </head> <body lang="FR" link="blue" vlink="purple"> <div class="WordSection1"> Hi,<o:p></o:p> Being subject to the PCI DSS standard, I implemented the proposed audit rules for PCI, albeit slightly changed because we are still using NTP instead of Chrony.<o:p></o:p> On a handful of vmware servers I have noticed that the clock_settime is used every fifteen minutes.<o:p></o:p> These servers seem to have higher values than other for offset and jitter due to a heavy load on a firewall.<o:p></o:p> These regular messages prevent us to have an automatic analysis of the event generated by the key 10.4.2b-time-change which we are required to do.<o:p></o:p> If I add a rule to monitor /etc/ntp.conf, would it be safe to ignore them if the auid is unset and the uid ntp ?<o:p></o:p> <o:p> </o:p> Below are the event I am seeing.<o:p></o:p> <o:p> </o:p> node=xxxxxxxx type=PROCTITLE msg=audit(08/06/18 01:58:58.525:175718) : proctitle=/usr/sbin/ntpd -u ntp:ntp -g<o:p></o:p> node=xxxxxxxx type=SYSCALL msg=audit(08/06/18 01:58:58.525:175718) : arch=x86_64 syscall=clock_settime success=yes exit=0 a0=CLOCK_REALTIME a1=0x7ffcba67b950 a2=0xb62c3 a3=0x4000 items=0 ppid=1 pid=819 auid=unset uid=ntp gid=ntp euid=ntp suid=ntp fsuid=ntp egid=ntp sgid=ntp fsgid=ntp tty=(none) ses=unset comm=ntpd exe=/usr/sbin/ntpd key=10.4.2b-time-change<o:p></o:p> ----<o:p></o:p> node=xxxxxxxx type=PROCTITLE msg=audit(08/06/18 02:14:01.746:175775) : proctitle=/usr/sbin/ntpd -u ntp:ntp -g<o:p></o:p> node=xxxxxxxx type=SYSCALL msg=audit(08/06/18 02:14:01.746:175775) : arch=x86_64 syscall=clock_settime success=yes exit=0 a0=CLOCK_REALTIME a1=0x7ffcba67b950 a2=0xec457 a3=0x4000 items=0 ppid=1 pid=819 auid=unset uid=ntp gid=ntp euid=ntp suid=ntp fsuid=ntp egid=ntp sgid=ntp fsgid=ntp tty=(none) ses=unset comm=ntpd exe=/usr/sbin/ntpd key=10.4.2b-time-change<o:p></o:p> ----<o:p></o:p> node=xxxxxxxx type=PROCTITLE msg=audit(08/06/18 02:30:29.973:175847) : proctitle=/usr/sbin/ntpd -u ntp:ntp -g<o:p></o:p> node=xxxxxxxx type=SYSCALL msg=audit(08/06/18 02:30:29.973:175847) : arch=x86_64 syscall=clock_settime success=yes exit=0 a0=CLOCK_REALTIME a1=0x7ffcba67b950 a2=0x2fab6 a3=0x4000 items=0 ppid=1 pid=819 auid=unset uid=ntp gid=ntp euid=ntp suid=ntp fsuid=ntp egid=ntp sgid=ntp fsgid=ntp tty=(none) ses=unset comm=ntpd exe=/usr/sbin/ntpd key=10.4.2b-time-change<o:p></o:p> <o:p> </o:p> <o:p> </o:p> Thank you for advising on this.<o:p></o:p> <o:p> </o:p> Philippe<o:p></o:p> </div> !!!************************************************************************************* "Ce message et les pièces jointes sont confidentiels et réservés à l'usage exclusif de ses destinataires. 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