[clamav-users] can't demonstrate that On-Access scanning is working (fedora 24)

Mickey Sola msola at sourcefire.com
Tue Aug 30 11:53:57 EDT 2016


Hi Hugo,

Could you try setting the max filesize option to a non-zero value and let
me know if that changes anything?

-Mickey

On Aug 30, 2016 7:51 AM, "Hugo Bernier" <hbernier at gmail.com> wrote:

> We have a new requirement at work that we have virus scanners installed on
> our workstations.
>
> What I'm trying to do is demonstrate that onAccess scanning works. What I'm
> expecting, which could be wrong, is that there would be output either in
> the logs or clamdtop when a file is opened other otherwise manipulated when
> verbose logging and "LogClean" is enabled. My assumption is that my setup
> is wrong. I've used
> http://blog.clamav.net/2016/03/configuring-on-access-
> scanning-in-clamav.html as
> a base for the settings described below.
>
> I'm using clamav 0.99.2 from fedora 24 and the up to date stock fedora 24
> kernel. CONFIG_FANOTIFY=y and CONFIG_FANOTIFY_ACCESS_PERMISSIONS=y are
> present in /boot/config-4.6.7-300.fc24.x86_64.
>
> Here's my configuration in /etc/clam.d/scan.conf:
>
> LogFile /var/log/clamd.scan
> LogFileUnlock yes
> LogFileMaxSize 2M
> LogTime yes
> LogClean yes
> LogVerbose yes
> LogRotate yes
> ExtendedDetectionInfo yes
> PidFile /var/run/clamd.scan/clamd.pid
> LocalSocket /var/run/clamd.scan/clamd.sock
>
> ScanOnAccess yes
> OnAccessMountPath /
> OnAccessMaxFileSize 0
> OnAccessExcludeUID 0
>
> When clamav starts, the logs show the following:
>
> Tue Aug 30 10:38:53 2016 -> +++ Started at Tue Aug 30 10:38:53 2016
> Tue Aug 30 10:38:53 2016 -> Received 0 file descriptor(s) from systemd.
> Tue Aug 30 10:38:53 2016 -> clamd daemon 0.99.2 (OS: linux-gnu, ARCH:
> x86_64, CPU: x86_64)
> Tue Aug 30 10:38:53 2016 -> Log file size limited to 2097152 bytes.
> Tue Aug 30 10:38:53 2016 -> Reading databases from /var/lib/clamav
> Tue Aug 30 10:38:53 2016 -> Not loading PUA signatures.
> Tue Aug 30 10:38:53 2016 -> Bytecode: Security mode set to "TrustSigned".
> Tue Aug 30 10:38:58 2016 -> Loaded 4772631 signatures.
> Tue Aug 30 10:38:59 2016 -> LOCAL: Unix socket file
> /var/run/clamd.scan/clamd.sock
> Tue Aug 30 10:38:59 2016 -> LOCAL: Setting connection queue length to 200
> Tue Aug 30 10:38:59 2016 -> Limits: Global size limit set to 104857600
> bytes.
> Tue Aug 30 10:38:59 2016 -> Limits: File size limit set to 26214400 bytes.
> Tue Aug 30 10:38:59 2016 -> Limits: Recursion level limit set to 16.
> Tue Aug 30 10:38:59 2016 -> Limits: Files limit set to 10000.
> Tue Aug 30 10:38:59 2016 -> Limits: Core-dump limit is 0.
> Tue Aug 30 10:38:59 2016 -> Limits: MaxEmbeddedPE limit set to 10485760
> bytes.
> Tue Aug 30 10:38:59 2016 -> Limits: MaxHTMLNormalize limit set to 10485760
> bytes.
> Tue Aug 30 10:38:59 2016 -> Limits: MaxHTMLNoTags limit set to 2097152
> bytes.
> Tue Aug 30 10:38:59 2016 -> Limits: MaxScriptNormalize limit set to 5242880
> bytes.
> Tue Aug 30 10:38:59 2016 -> Limits: MaxZipTypeRcg limit set to 1048576
> bytes.
> Tue Aug 30 10:38:59 2016 -> Limits: MaxPartitions limit set to 50.
> Tue Aug 30 10:38:59 2016 -> Limits: MaxIconsPE limit set to 100.
> Tue Aug 30 10:38:59 2016 -> Limits: MaxRecHWP3 limit set to 16.
> Tue Aug 30 10:38:59 2016 -> Limits: PCREMatchLimit limit set to 10000.
> Tue Aug 30 10:38:59 2016 -> Limits: PCRERecMatchLimit limit set to 5000.
> Tue Aug 30 10:38:59 2016 -> Limits: PCREMaxFileSize limit set to 26214400.
> Tue Aug 30 10:38:59 2016 -> Archive support enabled.
> Tue Aug 30 10:38:59 2016 -> Algorithmic detection enabled.
> Tue Aug 30 10:38:59 2016 -> Portable Executable support enabled.
> Tue Aug 30 10:38:59 2016 -> ELF support enabled.
> Tue Aug 30 10:38:59 2016 -> Mail files support enabled.
> Tue Aug 30 10:38:59 2016 -> OLE2 support enabled.
> Tue Aug 30 10:38:59 2016 -> PDF support enabled.
> Tue Aug 30 10:38:59 2016 -> SWF support enabled.
> Tue Aug 30 10:38:59 2016 -> HTML support enabled.
> Tue Aug 30 10:38:59 2016 -> XMLDOCS support enabled.
> Tue Aug 30 10:38:59 2016 -> HWP3 support enabled.
> Tue Aug 30 10:38:59 2016 -> Self checking every 600 seconds.
> Tue Aug 30 10:38:59 2016 -> Listening daemon: PID: 3818
> Tue Aug 30 10:38:59 2016 -> MaxQueue set to: 100
> Tue Aug 30 10:38:59 2016 -> ScanOnAccess: notifying only for access
> attempts.
> Tue Aug 30 10:38:59 2016 -> ScanOnAccess: Protecting '/' and rest of mount.
> Tue Aug 30 10:38:59 2016 -> ScanOnAccess: Max file size limited to -1 bytes
>
> And then nothing. No matter what programs I start, files I open, I simply
> don't get output in the logs or clamdtop related to onAccess scanning.
>
> What am I doing wrong?
>
> Best,
> Hugo
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