Need help to switch to ClamAV server

Hi,

We've been able to get ClamAV Server and SpamAssassin Server running and now i would know how to switch all the virtual server we already have to use it.

Our goal is to lower IO ressources usage.

I will appreciate if you can point me to the right direction to do it as a batch.

Thank you

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Comments

Howdy -- thanks for contacting us!

If you go into List Virtual Servers on the bottom left of Virtualmin, you can use that to update the available features in multiple domains all at once.

If i understand correctly, i need to disable virus and spam filtering for a first update and enable it back for a second update?

Do you know how much time it could take for 300 domains? (i know it depend on available ressources but do we talk about seconds, minutes or hours?

Thanks again

Hmm, in theory it'd just be a matter of selecting the domains in question (possibly all of them in this case), then going into Enable Feature Change, and there selecting "Enable" for the Spam and Virus filtering features.

Let us know if you're seeing a problem with that though!

I unfortunately don't know how long to expect it to take, but I wouldn't think it'd take longer than a minute or two.

Perfect, i'll wait and test it this evening.

Thanks again

Unhapilly, i've been able to do what you suggested me and it worked but clamscan and clamd continu to use all my cpu ressources.

Please can you help me with this? Maybe take a look at it?

I will really appreciate because this is a serious problem now and i have tons of customers that are complaning.

Thanks in advance

Can you describe the problem(s) that you're seeing?

Also, what is the output of these commands:

uptime
mailq | tail -1
free -m
ps auxwf

Lastly, what is Email Messages -> Spam and Virus Scanning -> Virus Scanning Program set to?

Also, note that I think I initially misunderstood the problem you were looking to solve, and I don't think my earlier comments helped with what you were asking for. Sorry for that.

But, the above (Comment #6) will help us better understand the issue you're describing.

Okay, so in that Spam and Virus Scanning screen, you'd want to change the Virus Scanning Program to "Local server scanner".

And similar with the SpamAssassin option, you'd want to change it to "spamc".

Note that when looking at your process list, it doesn't appear that ClamAV and SpamAssassin are the culprits for heavy IO usage. You have plenty of RAM though, and it certainly doesn't hurt to move them over to the server-based scanning methods.

When you check in the last line, clamd was using 100% of the CPU.

However, i just tried to make modifications you told me and i get this:

ERROR: Please edit the example config file /etc/clamd.d/scan.conf ERROR: Can't parse clamd configuration file /etc/clamd.d/scan.conf

That clamd process you're seeing there is the clamd daemon that you're trying to switch to. So that won't be going away based on the changes we're attempting to make here, it'll actually be getting more use.

It is indeed using 100% CPU at the moment, but overall has used very little CPU time, especially compared to some of the other processes running.

For example, unicorn and cpd have used significantly more CPU time than the clamd process has.

We're very happy to help move things over to the server-based scanners, there's no reason not to if you have the RAM for it (which you do) -- I'm just wondering if maybe something else is using up the IO that you're trying to free up.

Anyhow, regarding the clam scanner -- can you paste in the contents of the "/etc/clamd.d/scan.conf" file? Thanks!

#

Example config file for the Clam AV daemon

Please read the clamd.conf(5) manual before editing this file.

# Comment or remove the line below.

Example

Uncomment this option to enable logging. LogFile must be writable for the user running daemon. A full path is required. Default: disabled LogFile /var/log/clamd.scan By default the log file is locked for writing - the lock protects against running clamd multiple times (if want to run another clamd, please copy the configuration file, change the LogFile variable, and run the daemon with --config-file option). This option disables log file locking. Default: no LogFileUnlock yes Maximum size of the log file. Value of 0 disables the limit. You may use 'M' or 'm' for megabytes (1M = 1m = 1048576 bytes) and 'K' or 'k' for kilobytes (1K = 1k = 1024 bytes). To specify the size in bytes just don't use modifiers. If LogFileMaxSize is enabled, log rotation (the LogRotate option) will always be enabled. Default: 1M LogFileMaxSize 2M Log time with each message. Default: no LogTime yes Also log clean files. Useful in debugging but drastically increases the log size. Default: no LogClean yes Use system logger (can work together with LogFile). Default: no

LogSyslog yes

Specify the type of syslog messages - please refer to 'man syslog' for facility names. Default: LOG_LOCAL6 LogFacility LOG_MAIL Enable verbose logging. Default: no LogVerbose yes Enable log rotation. Always enabled when LogFileMaxSize is enabled. Default: no LogRotate yes Enable Prelude output. Default: no PreludeEnable yes

#

Set the name of the analyzer used by prelude-admin. Default: ClamAV PreludeAnalyzerName ClamAV Log additional information about the infected file, such as its size and hash, together with the virus name. ExtendedDetectionInfo yes This option allows you to save a process identifier of the listening daemon (main thread). Default: disabled PidFile /var/run/clamd.scan/clamd.pid Optional path to the global temporary directory. Default: system specific (usually /tmp or /var/tmp). TemporaryDirectory /var/tmp Path to the database directory. Default: hardcoded (depends on installation options) DatabaseDirectory /var/lib/clamav Only load the official signatures published by the ClamAV project. Default: no OfficialDatabaseOnly no The daemon can work in local mode, network mode or both. Due to security reasons we recommend the local mode. Path to a local socket file the daemon will listen on. Default: disabled (must be specified by a user) LocalSocket /var/run/clamd.scan/clamd.sock Sets the group ownership on the unix socket. Default: disabled (the primary group of the user running clamd) LocalSocketGroup virusgroup Sets the permissions on the unix socket to the specified mode. Default: disabled (socket is world accessible) LocalSocketMode 660 Remove stale socket after unclean shutdown. Default: yes FixStaleSocket yes TCP port address. Default: no TCPSocket 3310 TCP address. By default we bind to INADDR_ANY, probably not wise. Enable the following to provide some degree of protection from the outside world. This option can be specified multiple times if you want to listen on multiple IPs. IPv6 is now supported. Default: no TCPAddr 127.0.0.1 Maximum length the queue of pending connections may grow to. Default: 200 MaxConnectionQueueLength 30 Clamd uses FTP-like protocol to receive data from remote clients. If you are using clamav-milter to balance load between remote clamd daemons on firewall servers you may need to tune the options below. Close the connection when the data size limit is exceeded. The value should match your MTA's limit for a maximum attachment size. Default: 25M StreamMaxLength 10M Limit port range. Default: 1024 StreamMinPort 30000 Default: 2048 StreamMaxPort 32000 Maximum number of threads running at the same time. Default: 10 MaxThreads 20 Waiting for data from a client socket will timeout after this time (seconds). Default: 120 ReadTimeout 300 This option specifies the time (in seconds) after which clamd should timeout if a client doesn't provide any initial command after connecting. Default: 30 CommandReadTimeout 30 This option specifies how long to wait (in milliseconds) if the send buffer is full. Keep this value low to prevent clamd hanging

#

Default: 500 SendBufTimeout 200 Maximum number of queued items (including those being processed by MaxThreads threads) It is recommended to have this value at least twice MaxThreads if possible. WARNING: you shouldn't increase this too much to avoid running out of file descriptors, the following condition should hold: MaxThreads*MaxRecursion + (MaxQueue - MaxThreads) + 6< RLIMIT_NOFILE (usual max is 1024)

#

Default: 100 MaxQueue 200 Waiting for a new job will timeout after this time (seconds). Default: 30 IdleTimeout 60 Don't scan files and directories matching regex This directive can be used multiple times Default: scan all ExcludePath ^/proc/ ExcludePath ^/sys/ Maximum depth directories are scanned at. Default: 15 MaxDirectoryRecursion 20 Follow directory symlinks. Default: no FollowDirectorySymlinks yes Follow regular file symlinks. Default: no FollowFileSymlinks yes Scan files and directories on other filesystems. Default: yes CrossFilesystems yes Perform a database check. Default: 600 (10 min) SelfCheck 600 Execute a command when virus is found. In the command string %v will be replaced with the virus name. Default: no VirusEvent /usr/local/bin/send_sms 123456789 "VIRUS ALERT: %v" Run as another user (clamd must be started by root for this option to work) Default: don't drop privileges

User clamscan

Stop daemon when libclamav reports out of memory condition. ExitOnOOM yes Don't fork into background. Default: no Foreground yes Enable debug messages in libclamav. Default: no Debug yes Do not remove temporary files (for debug purposes). Default: no LeaveTemporaryFiles yes Permit use of the ALLMATCHSCAN command. If set to no, clamd will reject any ALLMATCHSCAN command as invalid. Default: yes AllowAllMatchScan no Detect Possibly Unwanted Applications. Default: no DetectPUA yes Exclude a specific PUA category. This directive can be used multiple times. See https://github.com/vrtadmin/clamav-faq/blob/master/faq/faq-pua.md for the complete list of PUA categories. Default: Load all categories (if DetectPUA is activated) ExcludePUA NetTool ExcludePUA PWTool Only include a specific PUA category. This directive can be used multiple times. Default: Load all categories (if DetectPUA is activated) IncludePUA Spy IncludePUA Scanner IncludePUA RAT This option causes memory or nested map scans to dump the content to disk. If you turn on this option, more data is written to disk and is available when the LeaveTemporaryFiles option is enabled. ForceToDisk yes This option allows you to disable the caching feature of the engine. By default, the engine will store an MD5 in a cache of any files that are not flagged as virus or that hit limits checks. Disabling the cache will have a negative performance impact on large scans. Default: no DisableCache yes In some cases (eg. complex malware, exploits in graphic files, and others), ClamAV uses special algorithms to detect abnormal patterns and behaviors that may be malicious. This option enables alerting on such heuristically detected potential threats. Default: yes HeuristicAlerts yes Allow heuristic alerts to take precedence. When enabled, if a heuristic scan (such as phishingScan) detects a possible virus/phish it will stop scan immediately. Recommended, saves CPU scan-time. When disabled, virus/phish detected by heuristic scans will be reported only at the end of a scan. If an archive contains both a heuristically detected virus/phish, and a real malware, the real malware will be reported

#

Keep this disabled if you intend to handle ".Heuristics." viruses differently from "real" malware. If a non-heuristically-detected virus (signature-based) is found first, the scan is interrupted immediately, regardless of this config option.

#

Default: no HeuristicScanPrecedence yes #

Heuristic Alerts

# With this option clamav will try to detect broken executables (both PE and ELF) and alert on them with the Broken.Executable heuristic signature. Default: no AlertBrokenExecutables yes Alert on encrypted archives and documents with heuristic signature (encrypted .zip, .7zip, .rar, .pdf). Default: no AlertEncrypted yes Alert on encrypted archives with heuristic signature (encrypted .zip, .7zip, .rar). Default: no AlertEncryptedArchive yes Alert on encrypted archives with heuristic signature (encrypted .pdf). Default: no AlertEncryptedDoc yes With this option enabled OLE2 files containing VBA macros, which were not detected by signatures will be marked as "Heuristics.OLE2.ContainsMacros". Default: no AlertOLE2Macros yes Alert on SSL mismatches in URLs, even if the URL isn't in the database. This can lead to false positives. Default: no AlertPhishingSSLMismatch yes Alert on cloaked URLs, even if URL isn't in database. This can lead to false positives. Default: no AlertPhishingCloak yes Alert on raw DMG image files containing partition intersections Default: no AlertPartitionIntersection yes #

Executable files

# PE stands for Portable Executable - it's an executable file format used in all 32 and 64-bit versions of Windows operating systems. This option allows ClamAV to perform a deeper analysis of executable files and it's also required for decompression of popular executable packers such as UPX, FSG, and Petite. If you turn off this option, the original files will still be scanned, but without additional processing. Default: yes ScanPE yes Certain PE files contain an authenticode signature. By default, we check the signature chain in the PE file against a database of trusted and revoked certificates if the file being scanned is marked as a virus. If any certificate in the chain validates against any trusted root, but does not match any revoked certificate, the file is marked as whitelisted. If the file does match a revoked certificate, the file is marked as virus. The following setting completely turns off authenticode verification. Default: no DisableCertCheck yes Executable and Linking Format is a standard format for UN*X executables. This option allows you to control the scanning of ELF files. If you turn off this option, the original files will still be scanned, but without additional processing. Default: yes ScanELF yes #

Documents

# This option enables scanning of OLE2 files, such as Microsoft Office documents and .msi files. If you turn off this option, the original files will still be scanned, but without additional processing. Default: yes ScanOLE2 yes This option enables scanning within PDF files. If you turn off this option, the original files will still be scanned, but without decoding and additional processing. Default: yes ScanPDF yes This option enables scanning within SWF files. If you turn off this option, the original files will still be scanned, but without decoding and additional processing. Default: yes ScanSWF yes This option enables scanning xml-based document files supported by libclamav. If you turn off this option, the original files will still be scanned, but without additional processing. Default: yes ScanXMLDOCS yes This option enables scanning of HWP3 files. If you turn off this option, the original files will still be scanned, but without additional processing. Default: yes ScanHWP3 yes #

Mail files

# Enable internal e-mail scanner. If you turn off this option, the original files will still be scanned, but without parsing individual messages/attachments. Default: yes ScanMail yes Scan RFC1341 messages split over many emails. You will need to periodically clean up $TemporaryDirectory/clamav-partial directory. WARNING: This option may open your system to a DoS attack. Never use it on loaded servers. Default: no ScanPartialMessages yes With this option enabled ClamAV will try to detect phishing attempts by using HTML.Phishing and Email.Phishing NDB signatures. Default: yes PhishingSignatures no With this option enabled ClamAV will try to detect phishing attempts by analyzing URLs found in emails using WDB and PDB signature databases. Default: yes PhishingScanURLs no #

Data Loss Prevention (DLP)

# Enable the DLP module Default: No StructuredDataDetection yes This option sets the lowest number of Credit Card numbers found in a file to generate a detect. Default: 3 StructuredMinCreditCardCount 5 This option sets the lowest number of Social Security Numbers found in a file to generate a detect. Default: 3 StructuredMinSSNCount 5 With this option enabled the DLP module will search for valid SSNs formatted as xxx-yy-zzzz Default: yes StructuredSSNFormatNormal yes With this option enabled the DLP module will search for valid SSNs formatted as xxxyyzzzz Default: no StructuredSSNFormatStripped yes #

HTML

# Perform HTML normalisation and decryption of MS Script Encoder code. Default: yes If you turn off this option, the original files will still be scanned, but without additional processing. ScanHTML yes #

Archives

# ClamAV can scan within archives and compressed files. If you turn off this option, the original files will still be scanned, but without unpacking and additional processing. Default: yes ScanArchive yes #

Limits

# The options below protect your system against Denial of Service attacks using archive bombs. This option sets the maximum amount of data to be scanned for each input file. Archives and other containers are recursively extracted and scanned up to this value. Value of 0 disables the limit Note: disabling this limit or setting it too high may result in severe damage to the system. Default: 100M MaxScanSize 150M Files larger than this limit won't be scanned. Affects the input file itself as well as files contained inside it (when the input file is an archive, a document or some other kind of container). Value of 0 disables the limit. Note: disabling this limit or setting it too high may result in severe damage to the system. Default: 25M MaxFileSize 30M Nested archives are scanned recursively, e.g. if a Zip archive contains a RAR file, all files within it will also be scanned. This options specifies how deeply the process should be continued. Note: setting this limit too high may result in severe damage to the system. Default: 16 MaxRecursion 10 Number of files to be scanned within an archive, a document, or any other container file. Value of 0 disables the limit. Note: disabling this limit or setting it too high may result in severe damage to the system. Default: 10000 MaxFiles 15000 Maximum size of a file to check for embedded PE. Files larger than this value will skip the additional analysis step. Note: disabling this limit or setting it too high may result in severe damage to the system. Default: 10M MaxEmbeddedPE 10M Maximum size of a HTML file to normalize. HTML files larger than this value will not be normalized or scanned. Note: disabling this limit or setting it too high may result in severe damage to the system. Default: 10M MaxHTMLNormalize 10M Maximum size of a normalized HTML file to scan. HTML files larger than this value after normalization will not be scanned. Note: disabling this limit or setting it too high may result in severe damage to the system. Default: 2M MaxHTMLNoTags 2M Maximum size of a script file to normalize. Script content larger than this value will not be normalized or scanned. Note: disabling this limit or setting it too high may result in severe damage to the system. Default: 5M MaxScriptNormalize 5M Maximum size of a ZIP file to reanalyze type recognition. ZIP files larger than this value will skip the step to potentially reanalyze as PE. Note: disabling this limit or setting it too high may result in severe damage to the system. Default: 1M MaxZipTypeRcg 1M This option sets the maximum number of partitions of a raw disk image to be scanned. Raw disk images with more partitions than this value will have up to the value number partitions scanned. Negative values are not allowed. Note: setting this limit too high may result in severe damage or impact performance. Default: 50 MaxPartitions 128 This option sets the maximum number of icons within a PE to be scanned. PE files with more icons than this value will have up to the value number icons scanned. Negative values are not allowed. WARNING: setting this limit too high may result in severe damage or impact performance. Default: 100 MaxIconsPE 200 This option sets the maximum recursive calls for HWP3 parsing during scanning. HWP3 files using more than this limit will be terminated and alert the user. Scans will be unable to scan any HWP3 attachments if the recursive limit is reached. Negative values are not allowed. WARNING: setting this limit too high may result in severe damage or impact performance. Default: 16 MaxRecHWP3 16 This option sets the maximum calls to the PCRE match function during an instance of regex matching. Instances using more than this limit will be terminated and alert the user but the scan will continue. For more information on match_limit, see the PCRE documentation. Negative values are not allowed. WARNING: setting this limit too high may severely impact performance. Default: 100000 PCREMatchLimit 20000 This option sets the maximum recursive calls to the PCRE match function during an instance of regex matching. Instances using more than this limit will be terminated and alert the user but the scan will continue. For more information on match_limit_recursion, see the PCRE documentation. Negative values are not allowed and values > PCREMatchLimit are superfluous. WARNING: setting this limit too high may severely impact performance. Default: 2000 PCRERecMatchLimit 10000 This option sets the maximum filesize for which PCRE subsigs will be executed. Files exceeding this limit will not have PCRE subsigs executed unless a subsig is encompassed to a smaller buffer. Negative values are not allowed. Setting this value to zero disables the limit. WARNING: setting this limit too high or disabling it may severely impact performance. Default: 25M PCREMaxFileSize 100M When AlertExceedsMax is set, files exceeding the MaxFileSize, MaxScanSize, or MaxRecursion limit will be flagged with the virus "Heuristics.Limits.Exceeded". Default: no AlertExceedsMax yes #

On-access Scan Settings

# Enable on-access scanning. Currently, this is supported via fanotify. Clamuko/Dazuko support has been deprecated. Default: no ScanOnAccess yes Set the mount point to be scanned. The mount point specified, or the mount point containing the specified directory will be watched. If any directories are specified, this option will preempt the DDD system. This will notify only. It can be used multiple times. (On-access scan only) Default: disabled OnAccessMountPath / OnAccessMountPath /home/user Don't scan files larger than OnAccessMaxFileSize Value of 0 disables the limit. Default: 5M OnAccessMaxFileSize 10M Set the include paths (all files inside them will be scanned). You can have multiple OnAccessIncludePath directives but each directory must be added in a separate line. (On-access scan only) Default: disabled OnAccessIncludePath /home OnAccessIncludePath /students Set the exclude paths. All subdirectories are also excluded. (On-access scan only) Default: disabled OnAccessExcludePath /home/bofh With this option you can whitelist the root UID (0). Processes run under root with be able to access all files without triggering scans or permission denied events. Note that if clamd cannot check the uid of the process that generated an on-access scan event (e.g., because OnAccessPrevention was not enabled, and the process already exited), clamd will perform a scan. Thus, setting OnAccessExcludeRootUID is not guaranteed to prevent every access by the root user from triggering a scan (unless OnAccessPrevention is enabled). Default: no OnAccessExcludeRootUID no With this option you can whitelist specific UIDs. Processes with these UIDs will be able to access all files without triggering scans or permission denied events. This option can be used multiple times (one per line). Using a value of 0 on any line will disable this option entirely. To whitelist the root UID (0) please enable the OnAccessExcludeRootUID option. Also note that if clamd cannot check the uid of the process that generated an on-access scan event (e.g., because OnAccessPrevention was not enabled, and the process already exited), clamd will perform a scan. Thus, setting OnAccessExcludeUID is not guaranteed to prevent every access by the specified uid from triggering a scan (unless OnAccessPrevention is enabled). Default: disabled OnAccessExcludeUID -1 Toggles dynamic directory determination. Allows for recursively watching include paths. (On-access scan only) Default: no OnAccessDisableDDD yes Modifies fanotify blocking behaviour when handling permission events. If off, fanotify will only notify if the file scanned is a virus, and not perform any blocking. (On-access scan only) Default: no OnAccessPrevention yes Toggles extra scanning and notifications when a file or directory is created or moved. Requires the DDD system to kick-off extra scans. NOTE: This feature is disabled until a thread resource leak bug in the OnAccessExtraScanning code can be resolved. (On-access scan only) Default: no OnAccessExtraScanning yes #

Bytecode

# With this option enabled ClamAV will load bytecode from the database. It is highly recommended you keep this option on, otherwise you'll miss detections for many new viruses. Default: yes Bytecode yes Set bytecode security level. Possible values: None - No security at all, meant for debugging. DO NOT USE THIS ON PRODUCTION SYSTEMS. This value is only available if clamav was built with --enable-debug! TrustSigned - Trust bytecode loaded from signed .c[lv]d files, insert runtime safety checks for bytecode loaded from other sources. Paranoid - Don't trust any bytecode, insert runtime checks for all. Recommended: TrustSigned, because bytecode in .cvd files already has these checks. Note that by default only signed bytecode is loaded, currently you can only load unsigned bytecode in --enable-debug mode.

#

Default: TrustSigned BytecodeSecurity TrustSigned Set bytecode timeout in milliseconds. Default: 5000 BytecodeTimeout 1000 #

Statistics gathering and submitting

#

LocalSocketMode 666

Okay, there's a line near the top of that file that simple reads:

Example

Can you comment that out, and then try enabling that ClamAV setting again?

When you say "try enabling setting again", how you want me to do it?

i commented that line but how to enable this setting?

I believe you initially ran into that issue when trying the steps in Comment #9/#10.

My suggestion would be to take a peek at Comment #9, and to try the settings mentioned in there.

If you have any questions on that, please feel free to let us know!

When i do it, i get this error:

The selected virus scanning command does not work : ----------- SCAN SUMMARY ----------- Infected files: 0 Time: 0.000 sec (0 m 0 s)

It's start to be really urgent. Our system is really slow and tons of customers complaints.

Can you help us with this asap please.

If necessary, i will give you access to make some tests.

thanks

If it's urgent, what you may want to due is temporarily disable ClamAV to see if that helps.

That will at least ensure that we're looking at the right place.

When you shared your "ps" list above, it wasn't really looking like ClamAV was using a particularly large amount of resources.

And in fact, the only ClamAV process using a noticeable amount of resources wasn't even being used for email scanning. The lone ClamAV process I see there is the daemon, which currently isn't in use (that is, that's what we're trying to switch to, but at the moment it's just sitting there).

There were no ClamAV process active that were scanning an email. Any resources being used at that time wouldn't be helped by us changing any ClamAV settings.

My suspicion is that one of those other processes we saw above that were using a lot of CPU time is the culprit of any resources issues -- though something could be using up a lot of disk IO as well, that can cause issues too.

Now, I'm more than happy to help switch over to the ClamAV server scanner, as that should work, and it never hurts to rule it out.

As far as making that switch to the ClamAV server scanner --

Just to be super sure I understand what you're saying -- you're saying that when going into Email Messages -> Spam and Virus Scanning, and you set "Virus Scanning Program" to "Local Server Scanner", and then click "Save", you're receiving an error?

That's an odd one, but it could indicate that there's a problem with the ClamAV config.

I'd be curious if you're able to restart ClamAV with this command:

service clamd@scan.service restart

If that doesn't work, what error gets generated in the logs? ClamAV messages on CentOS usually are shown in /var/log/messages.

I was looking into what the problem there could be... I searched on that error, and I believe the most recent occurrence of that same issue was your post from 2014 :-)

You apparently were having the same trouble switching to the server scanner back then, we never did figure that out.

Since restarting the ClamAV service isn't generating an error, I think what I'd need to do is work with Jamie to figure out exactly what command line is being run that isn't working properly. The only trouble there is that he's traveling, so I don't know when exactly he'll be able to respond.

Here's what I'd suggest in the meantime --

Just to rule some things out, what is the output of this command... this will show which ClamAV packages are being used:

rpm -qa | grep -i clamav

And then, would you like a hand with how to temporarily disable ClamAV altogether?

As it might be good just to learn whether or not it really is causing the trouble you're seeing. What we can do is disable the ClamAV feature in Virtualmin, and then stop the ClamAV service -- and then we can look at what sort of performance you get afterwards.