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ClamAV is an open source (GPLv2) anti-virus toolkit.
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clamav/docs/man/clamd.conf.5.in

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.TH "clamd.conf" "5" "February 12, 2007" "ClamAV @VERSION@" "Clam AntiVirus"
.SH "NAME"
.LP
\fBclamd.conf\fR \- Configuration file for Clam AntiVirus Daemon
.SH "DESCRIPTION"
.LP
clamd.conf configures the Clam AntiVirus daemon, clamd(8).
.SH "FILE FORMAT"
The file consists of comments and options with arguments. Each line which starts with a hash (\fB#\fR) symbol is ignored by the parser. Options and arguments are case sensitive and of the form \fBOption Argument\fR. The arguments are of the following types:
.TP
\fBBOOL\fR
Boolean value (yes/no or true/false or 1/0).
.TP
\fBSTRING\fR
String without blank characters.
.TP
\fBSIZE\fR
Size in bytes. You can use 'M' or 'm' modifiers for megabytes and 'K' or 'k' for kilobytes.
.TP
\fBNUMBER\fR
Unsigned integer.
.SH "DIRECTIVES"
.LP
When some option is not used (commented out or not included in the configuration file at all) clamd takes a default action.
.TP
\fBExample\fR
If this option is set clamd will not run.
.TP
\fBLogFile STRING\fR
Enable logging to selected file.
.br
Default: no
.TP
\fBLogFileUnlock BOOL\fR
Disable a system lock that protects against running clamd with the same configuration file multiple times.
.br
Default: no
.TP
\fBLogFileMaxSize SIZE\fR
Limit the size of the log file. The logger will be automatically disabled if the file is greater than SIZE. Value of 0 disables the limit.
.br
Default: 1M
.TP
\fBLogTime BOOL\fR
Log time for each message.
.br
Default: no
.TP
\fBLogClean BOOL\fR
Log clean files.
.br
Default: no
.TP
\fBLogSyslog BOOL\fR
Use system logger (can work together with LogFile).
.br
Default: no
.TP
\fBLogFacility STRING\fR
Specify the type of syslog messages \- please refer to 'man syslog' for facility names.
.br
Default: LOG_LOCAL6
.TP
\fBLogVerbose BOOL\fR
Enable verbose logging.
.br
Default: no
.TP
\fBPidFile STRING\fR
Save the process identifier of a listening daemon (main thread) to a specified file.
.br
Default: no
.TP
\fBTemporaryDirectory STRING\fR
Optional path to the global temporary directory.
.br
Default: system specific (usually /tmp or /var/tmp).
.TP
\fBDatabaseDirectory STRING\fR
Path to a directory containing database files.
.br
Default: @DBDIR@
.TP
\fBLocalSocket STRING\fR
Path to a local (Unix) socket the daemon will listen on.
.br
Default: no
.TP
\fBFixStaleSocket BOOL\fR
Remove stale socket after unclean shutdown.
.br
Default: yes
.TP
\fBTCPSocket NUMBER\fR
TCP port number the daemon will listen on.
.br
Default: no
.TP
\fBTCPAddr STRING\fR
TCP socket address to bind to. By default clamd binds to INADDR_ANY.
.br
Default: no
.TP
\fBMaxConnectionQueueLength NUMBER\fR
Maximum length the queue of pending connections may grow to.
.br
Default: 15
.TP
\fBMaxThreads NUMBER\fR
Maximum number of threads running at the same time.
.br
Default: 10
.TP
\fBReadTimeout NUMBER\fR
Waiting for data from a client socket will timeout after this time (seconds).
.br
Default: 120
.TP
\fBIdleTimeout NUMBER\fR
Waiting for a new job will timeout after this time (seconds).
.br
Default: 30
.TP
\fBExcludePath REGEX\fR
Don't scan files and directories matching REGEX. This directive can be used multiple times.
.br
Default: scan all
.TP
\fBMaxDirectoryRecursion NUMBER\fR
Maximum depth directories are scanned at.
.br
Default: 15
.TP
\fBFollowDirectorySymlinks BOOL\fR
Follow directory symlinks.
.br
Default: no
.TP
\fBFollowFileSymlinks BOOL\fR
Follow regular file symlinks.
.br
Default: no
.TP
\fBSelfCheck NUMBER\fR
Perform a database check.
.br
Default: 1800
.TP
\fBVirusEvent COMMAND\fR
Execute COMMAND when a virus is found. In the command string %v will be replaced with the virus name.
\fR
.br
Default: no
.TP
\fBExitOnOOM BOOL\fR
Stop daemon when libclamav reports out of memory condition.
.br
Default: no
.TP
\fBUser STRING\fR
Run as another user (clamd must be started by root to make this option working).
.br
Default: no
.TP
\fBAllowSupplementaryGroups BOOL\fR
Initialize supplementary group access (clamd must be started by root).
.br
Default: no
.TP
\fBForeground BOOL\fR
Don't fork into background.
.br
Default: no
.TP
\fBDebug BOOL\fR
Enable debug messages from libclamav.
.TP
\fBLeaveTemporaryFiles BOOL\fR
Do not remove temporary files (for debug purpose).
.br
Default: no
.TP
\fBStreamMaxLength SIZE\fR
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 Stream* options. This option allows you to specify the upper limit for data size that will be transfered to remote daemon when scanning a single file. It should match your MTA's limit for a maximum attachment size.
.br
Default: 10M
.TP
\fBStreamMinPort NUMBER\fR
Limit data port range.
.br
Default: 1024
.TP
\fBStreamMaxPort NUMBER\fR
Limit data port range.
.br
Default: 2048
.TP
\fBDetectPUA\fR
Detect Possibly Unwanted Applications.
.br
Default: No
.TP
\fBExcludePUA CATEGORY\fR
Exclude a specific PUA category. This directive can be used multiple times. See http://www.clamav.net/support/pua for the complete list of PUA categories.
.br
Default: Load all categories (if DetectPUA is activated)
.TP
\fBIncludePUA CATEGORY\fR
Only include a specific PUA category. This directive can be used multiple times. See http://www.clamav.net/support/pua for the complete list of PUA categories.
.br
Default: Load all categories (if DetectPUA is activated)
.TP
\fBAlgorithmicDetection BOOL\fR
In some cases (eg. complex malware, exploits in graphic files, and others), ClamAV uses special algorithms to provide accurate detection. This option controls the algorithmic detection.
.br
Default: yes
.TP
\fBScanPE BOOL\fR
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.
.br
Default: yes
.TP
\fBScanELF BOOL\fR
Executable and Linking Format is a standard format for UN*X executables. This option allows you to control the scanning of ELF files.
.br
Default: yes
.TP
\fBDetectBrokenExecutables BOOL\fR
With this option clamd will try to detect broken executables (both PE and ELF) and mark them as Broken.Executable.
.br
Default: no
.TP
\fBScanOLE2 BOOL\fR
This option enables scanning of OLE2 files, such as Microsoft Office documents and .msi files.
.br
Default: yes
.TP
\fBScanPDF BOOL\fR
This option enables scanning within PDF files.
.br
Default: yes
.TP
\fBScanHTML BOOL\fR
Enables HTML detection and normalisation.
.br
Default: yes
.TP
\fBScanMail BOOL\fR
Enable scanning of mail files.
.br
Default: yes
.TP
\fBMailFollowURLs BOOL\fR
If an email contains URLs ClamAV can download and scan them. \fBWARNING: This option may open your system to a DoS attack. Never use it on loaded servers.\fR
.br
Default: no
.TP
\fBScanPartialMessages BOOL\fR
Scan RFC1341 messages split over many emails. You will need to periodically clean up $TemporaryDirectory/clamav-partial directory. \fBWARNING: This option may open your system to a DoS attack. Never use it on loaded servers.\fR
.br
Default: no
.TP
\fBMailMaxRecursion NUMBER (OBSOLETE)\fR
\fBWARNING:\fR This option is no longer accepted. See \fBMaxRecursion\fR.
.TP
\fBPhishingSignatures BOOL\fR
With this option enabled ClamAV will try to detect phishing attempts by using signatures.
.br
Default: yes
.TP
\fBPhishingScanURLs BOOL\fR
Scan URLs found in mails for phishing attempts using heuristics. This will classify "Possibly Unwanted" phishing emails as Phishing.Heuristics.Email.*
.br
Default: yes
.TP
\fBPhishingAlwaysBlockSSLMismatch BOOL\fR
Always block SSL mismatches in URLs, even if the URL isn't in the database. This can lead to false positives.
.br
Default: no
.TP
\fBPhishingAlwaysBlockCloak BOOL\fR
Always block cloaked URLs, even if URL isn't in database. This can lead to false positives.
.br
Default: no
.TP
\fBHeuristicScanPrecedence BOOL\fR
Allow heuristic match to take precedence. When enabled, if a heuristic scan (such as phishingScan) detects a possible virus/phishing it will stop scanning immediately. Recommended, saves CPU scan-time. When disabled, virus/phishing detected by heuristic scans will be reported only at the end of a scan. If an archive contains both a heuristically detected virus/phishing, 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.
.br
Default: no
.TP
\fBStructuredDataDetection BOOL\fR
Enable the DLP module.
.br
Default: no
.TP
\fBStructuredMinCreditCardCount NUMBER\fR
This option sets the lowest number of Credit Card numbers found in a file to generate a detect.
.br
Default: 3
.TP
\fBStructuredMinSSNCount NUMBER\fR
This option sets the lowest number of Social Security Numbers found in a file to generate a detect.
.br
Default: 3
.TP
\fBStructuredSSNFormatNormal BOOL\fR
With this option enabled the DLP module will search for valid SSNs formatted as xxx-yy-zzzz.
.br
Default: Yes
.TP
\fBStructuredSSNFormatStripped BOOL\fR
With this option enabled the DLP module will search for valid SSNs formatted as xxxyyzzzz.
.br
Default: No
.TP
\fBScanArchive BOOL\fR
Enable archive scanning.
.br
Default: yes
.TP
\fBArchiveMaxFileSize (OBSOLETE)\fR
\fBWARNING:\fR This option is no longer accepted. See \fBMaxFileSize\fR and \fBMaxScanSize\fR.
.TP
\fBArchiveMaxRecursion (OBSOLETE)\fR
\fBWARNING:\fR This option is no longer accepted. See \fBMaxRecursion\fR.
.TP
\fBArchiveMaxFiles (OBSOLETE)\fR
\fBWARNING:\fR This option is no longer accepted. See \fBMaxFiles\fR.
.TP
\fBArchiveMaxCompressionRatio (OBSOLETE)\fR
\fBWARNING:\fR This option is no longer accepted.
.TP
\fBArchiveBlockMax (OBSOLETE)\fR
\fBWARNING:\fR This option is no longer accepted.
.TP
\fBArchiveLimitMemoryUsage BOOL\fR
Use slower decompression algorithm which uses less memory. This option only affects the bzip2 decompressor.
.br
Default: no
.TP
\fBArchiveBlockEncrypted BOOL\fR
Mark encrypted archives as viruses (Encrypted.Zip, Encrypted.RAR).
.br
Default: no
.TP
\fBMaxScanSize SIZE\fR
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. \fBWarning: disabling this limit or setting it too high may result in severe damage to the system.\fR
.br
Default: 100M
.TP
\fBMaxFileSize SIZE\fR
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). \fBWarning: disabling this limit or setting it too high may result in severe damage to the system.\fR
.br
Default: 25M
.TP
\fBMaxRecursion NUMBER\fR
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. \fBWarning: disabling this limit or setting it too high may result in severe damage to the system.\fR
.br
Default: 16
.TP
\fBMaxFiles NUMBER\fR
Number of files to be scanned within an archive, a document, or any other kind of container. \fBWarning: disabling this limit or setting it too high may result in severe damage to the system.\fR
.br
Default: 10000
.TP
\fBClamukoScanOnAccess BOOL\fR
Enable Clamuko. Dazuko (/dev/dazuko) must be configured and running.
.br
Default: no
.TP
\fBClamukoScanOnOpen BOOL\fR
Scan files on open.
.br
Default: no
.TP
\fBClamukoScanOnClose BOOL\fR
Scan files on close.
.br
Default: no.
.TP
\fBClamukoScanOnExec BOOL\fR
Scan files on execute.
.br
Default: no
.TP
\fBClamukoIncludePath STRING\fR
Set the include paths (all files and directories inside them will be scanned). You can have multiple ClamukoIncludePath directives but each directory must be added in a separate line).
.br
Default: no
.TP
\fBClamukoExcludePath STRING\fR
Set the exclude paths. All subdirectories will also be excluded.
.br
Default: no
.TP
\fBClamukoMaxFileSize SIZE\fR
Ignore files larger than SIZE.
.br
Default: 5M
.SH "FILES"
.LP
@CFGDIR@/clamd.conf
.SH "AUTHOR"
.LP
Tomasz Kojm <tkojm@clamav.net>
.SH "SEE ALSO"
.LP
clamd(8), clamdscan(1), clamav-milter(8), clamscan(1), freshclam(1), sigtool(1)