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clamd.conf(5)                             Clam AntiVirus                            clamd.conf(5)



NAME
       clamd.conf - Configuration file for Clam AntiVirus Daemon

DESCRIPTION
       clamd.conf configures the Clam AntiVirus daemon, clamd(8).

FILE FORMAT
       The  file  consists  of comments and options with arguments. Each line which starts with a
       hash (#) symbol is ignored by the parser. Options and arguments are case sensitive and  of
       the form Option Argument. The arguments are of the following types:

       BOOL   Boolean value (yes/no or true/false or 1/0).

       STRING String without blank characters.

       SIZE   Size  in  bytes.  You can use 'M' or 'm' modifiers for megabytes and 'K' or 'k' for
              kilobytes. To specify the size in bytes just don't use modifiers.

       NUMBER Unsigned integer.

DIRECTIVES
       When some option is not used (commented out or not included in the configuration  file  at
       all) clamd takes a default action.

       Example
              If this option is set clamd will not run.

       LogFile STRING
              Save all reports to a log file.
              Default: disabled

       LogFileUnlock BOOL
              By  default the log file is locked for writing and only a single daemon process can
              write to it. This option disables the lock.
              Default: no

       LogFileMaxSize SIZE
              Maximum size of the log file.
              Value of 0 disables the limit.
              Default: 1048576

       LogTime BOOL
              Log time for each message.
              Default: no

       LogClean BOOL
              Log all clean files.
              Useful in debugging but drastically increases the log size.
              Default: no

       LogSyslog BOOL
              Use the system logger (can work together with LogFile).
              Default: no

       LogFacility STRING
              Type of syslog messages
              Please refer to 'man syslog' for facility names.
              Default: LOG_LOCAL6

       LogVerbose BOOL
              Enable verbose logging.
              Default: no

       LogRotate BOOL
              Rotate log file. Requires LogFileMaxSize option set prior to this option.
              Default: no

       ExtendedDetectionInfo BOOL
              Log additional information about the infected file, such  as  its  size  and  hash,
              together with the virus name.
              Default: no

       PidFile STRING
              Save  the  process  identifier  of  a listening daemon (main thread) to a specified
              file.
              Default: disabled

       TemporaryDirectory STRING
              This option allows you to change the default temporary directory.
              Default: system specific (usually /tmp or /var/tmp).

       DatabaseDirectory STRING
              This option allows you to change the default database directory. If you enable  it,
              please make sure it points to the same directory in both clamd and freshclam.
              Default: defined at configuration (/usr/local/share/clamav)

       OfficialDatabaseOnly BOOL
              Only load the official signatures published by the ClamAV project.
              Default: no

       LocalSocket STRING
              Path to a local (Unix) socket the daemon will listen on.
              Default: disabled

       LocalSocketGroup STRING
              Sets the group ownership on the unix socket.
              Default: the primary group of the user running clamd

       LocalSocketMode STRING
              Sets the permissions on the unix socket to the specified mode.
              Default: socket is world readable and writable

       FixStaleSocket BOOL
              Remove stale socket after unclean shutdown.
              Default: yes

       TCPSocket NUMBER
              TCP port number the daemon will listen on.
              Default: disabled

       TCPAddr STRING
              By default clamd binds to INADDR_ANY.
              This  option allows you to restrict the TCP address and provide some degree of pro‐
              tection from the outside world. This option can  be  specified  multiple  times  in
              order to listen on multiple IPs. IPv6 is now supported.
              Default: disabled

       MaxConnectionQueueLength NUMBER
              Maximum length the queue of pending connections may grow to.
              Default: 200

       StreamMaxLength SIZE
              Close the STREAM session when the data size limit is exceeded.
              The value should match your MTA's limit for the maximum attachment size.
              Default: 25M

       StreamMinPort NUMBER
              The STREAM command uses an FTP-like protocol.
              This option sets the lower boundary for the port range.
              Default: 1024

       StreamMaxPort NUMBER
              This option sets the upper boundary for the port range.
              Default: 2048

       MaxThreads NUMBER
              Maximum number of threads running at the same time.
              Default: 10

       ReadTimeout NUMBER
              This  option  specifies the time (in seconds) after which clamd should timeout if a
              client doesn't provide any data.
              Default: 120

       CommandReadTimeout NUMBER
              This option specifies the time (in seconds) after which clamd should timeout  if  a
              client doesn't provide any initial command after connecting.  Note: the timeout for
              subsequents commands, and/or data chunks is specified by ReadTimeout.
              Default: 5

       SendBufTimeout NUMBER
              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

       MaxQueue NUMBER
              Maximum  number  of  queued  items  (including  those being processed by MaxThreads
              threads).  It is recommended to have this value at least twice MaxThreads if possi‐
              ble.
              WARNING: you shouldn't increase this too much to avoid running out of file descrip‐
              tors, the following condition should hold:  MaxThreads*MaxRecursion  +  MaxQueue  -
              MaxThreads  +  6 < RLIMIT_NOFILE.  RLIMIT_NOFILE is the maximum number of open file
              descriptors (usually 1024), set by ulimit -n.
              Default: 100

       IdleTimeout NUMBER
              This option specifies how long (in seconds) the process should wait for a new job.
              Default: 30

       ExcludePath REGEX
              Don't scan files and directories matching REGEX. This directive can be used  multi‐
              ple times.
              Default: disabled

       MaxDirectoryRecursion NUMBER
              Maximum depth directories are scanned at.
              Default: 15

       FollowDirectorySymlinks BOOL
              Follow directory symlinks.
              Default: no

       CrossFilesystems BOOL
              Scan files and directories on other filesystems.
              Default: yes

       FollowFileSymlinks BOOL
              Follow regular file symlinks.
              Default: no

       SelfCheck NUMBER
              This option specifies the time intervals (in seconds) in which clamd should perform
              a database check.
              Default: 600

       VirusEvent COMMAND
              Execute a command when a virus is found. In the command string %v will be  replaced
              with  the  virus  name.  Additionally,  two  environment variables will be defined:
              $CLAM_VIRUSEVENT_FILENAME and $CLAM_VIRUSEVENT_VIRUSNAME.
              Default: disabled

       ExitOnOOM BOOL
              Stop daemon when libclamav reports out of memory condition.
              Default: no

       AllowAllMatchScan BOOL
              Permit use of the ALLMATCHSCAN command.
              Default: yes

       Foreground BOOL
              Don't fork into background.
              Default: no

       Debug BOOL
              Enable debug messages from libclamav.
              Default: no

       LeaveTemporaryFiles BOOL
              Do not remove temporary files (for debugging purpose).
              Default: no

       User STRING
              Run the daemon as a specified user (the process must be started by root).
              Default: disabled

       Bytecode BOOL
              With this option enabled ClamAV will load bytecode from the database. It is  highly
              recommended  you  keep this option turned on, otherwise you may miss detections for
              many new viruses.
              Default: yes

       BytecodeSecurity STRING
              Set bytecode security level.
              Possible values:
                  TrustSigned - trust bytecode loaded from signed .c[lv]d files and  insert  run‐
                  time 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.
              Default: TrustSigned

       BytecodeTimeout NUMBER
              Set bytecode timeout in milliseconds.
              Default: 5000

       BytecodeUnsigned BOOL
              Allow loading bytecode from outside digitally signed .c[lv]d files.
              Default: no

       BytecodeMode STRING
              Set bytecode execution mode.
              Possible values:
                  Auto - automatically choose JIT if possible, fallback to interpreter
                  ForceJIT - always choose JIT, fail if not possible
                  ForceInterpreter - always choose interpreter
                  Test - run with both JIT and interpreter and compare results. Make all failures
                  fatal.
              Default: Auto

       DetectPUA BOOL
              Detect Possibly Unwanted Applications.
              Default: No

       ExcludePUA CATEGORY
              Exclude a specific PUA category. This directive can be  used  multiple  times.  See
              https://www.clamav.net/documents/potentially-unwanted-applications-pua for the com‐
              plete list of PUA categories.
              Default: disabled

       IncludePUA CATEGORY
              Only include a specific PUA category. This directive can be  used  multiple  times.
              See  https://www.clamav.net/documents/potentially-unwanted-applications-pua for the
              complete list of PUA categories.
              Default: disabled

       AlgorithmicDetection BOOL
              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.
              Default: yes

       ScanPE BOOL
              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 per‐
              form a deeper analysis of executable files and it's also required for decompression
              of popular executable packers such as UPX.
              If  you turn off this option, the original files will still be scanned, but without
              additional processing.
              Default: yes

       ScanELF BOOL
              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

       DetectBrokenExecutables BOOL
              With this option clamd will try to detect broken executables (both PE and ELF)  and
              mark them as Broken.Executable.
              Default: no

       ScanMail BOOL
              Enable scanning of mail files.
              If  you turn off this option, the original files will still be scanned, but without
              parsing individual messages/attachments.
              Default: yes

       ScanPartialMessages BOOL
              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

       PhishingSignatures BOOL
              With this option enabled ClamAV will try to detect phishing attempts by using  sig‐
              natures.
              Default: yes

       PhishingScanURLs BOOL
              Scan URLs found in mails for phishing attempts using heuristics. This will classify
              "Possibly Unwanted" phishing emails as Phishing.Heuristics.Email.*
              Default: yes

       PhishingAlwaysBlockCloak BOOL
              Always block cloaked URLs, even if URL isn't in database. This can  lead  to  false
              positives.
              Default: no

       PhishingAlwaysBlockSSLMismatch BOOL
              Always  block  SSL  mismatches in URLs, even if the URL isn't in the database. This
              can lead to false positives.
              Default: no

       PartitionIntersection BOOL
              Detect partition intersections in raw disk images using heuristics.
              Default: no

       HeuristicScanPrecedence BOOL
              Allow heuristic match to take precedence. When enabled, if a heuristic  scan  (such
              as  phishingScan)  detects  a possible virus/phishing it will stop scanning immedi‐
              ately. 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.
              Default: no

       StructuredDataDetection BOOL
              Enable the DLP module.
              Default: no

       StructuredMinCreditCardCount NUMBER
              This option sets the lowest number of Credit Card numbers found in a file to gener‐
              ate a detect.
              Default: 3

       StructuredMinSSNCount NUMBER
              This  option  sets  the lowest number of Social Security Numbers found in a file to
              generate a detect.
              Default: 3

       StructuredSSNFormatNormal BOOL
              With this option enabled the DLP module will search for  valid  SSNs  formatted  as
              xxx-yy-zzzz.
              Default: Yes

       StructuredSSNFormatStripped BOOL
              With  this  option  enabled  the DLP module will search for valid SSNs formatted as
              xxxyyzzzz.
              Default: No

       ScanHTML BOOL
              Perform HTML/JavaScript/ScriptEncoder normalisation and decryption.
              If you turn off this option, the original files will still be scanned, but  without
              additional processing.
              Default: yes

       ScanOLE2 BOOL
              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

       OLE2BlockMacros BOOL
              With  this  option  enabled  OLE2 files with VBA macros, which were not detected by
              signatures will be marked as "Heuristics.OLE2.ContainsMacros".
              Default: no

       BlockMax BOOL
               Flag files with "Heuristics.Limits.Exceeded" when scanning is  incomplete  due  to
              exceeding a scan or file size limit.
              Default: no

       ScanPDF BOOL
              This option enables scanning within PDF files.
              If  you turn off this option, the original files will still be scanned, but without
              additional processing.
              Default: yes

       ScanSWF BOOL
              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

       ScanXMLDOCS BOOL
              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

       ScanHWP3 BOOL
              This option enables scanning HWP3 files.
              If you turn off this option, the original files will still be scanned, but  without
              additional processing.
              Default: yes

       ScanArchive BOOL
              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

       ArchiveBlockEncrypted BOOL
              Mark encrypted archives as viruses (Encrypted.Zip, Encrypted.RAR).
              Default: no

       ForceToDisk
              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
              leave-temps option is enabled at the cost of more disk writes.
              Default: no

       MaxScanSize SIZE
              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.  The  size
              of  an  archive  plus the sum of the sizes of all files within archive count toward
              the scan size. For example, a 1M uncompressed archive containing a single 1M  inner
              file  counts  as 2M toward the max scan size. Warning: disabling this limit or set‐
              ting it too high may result in severe damage to the system.
              Default: 100M

       MaxFileSize SIZE
              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). Warning: disabling this limit or setting it too high
              may result in severe damage to the system.
              Default: 25M

       MaxRecursion NUMBER
              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.  Warning: setting this limit too high may result in
              severe damage to the system.
              Default: 16

       MaxFiles NUMBER
              Number of files to be scanned within an archive, a document, or any other  kind  of
              container.  Warning:  disabling  this  limit  or  setting it too high may result in
              severe damage to the system.
              Default: 10000

       MaxEmbeddedPE SIZE
              This option sets the maximum size of a file to check for embedded PE.
              Files larger than this value will skip the additional analysis step.
              Negative values are not allowed.
              Default: 10M

       MaxHTMLNormalize SIZE
              This option sets the maximum size of a HTML file to normalize.
              HTML files larger than this value will not be normalized or scanned.
              Negative values are not allowed.
              Default: 10M

       MaxHTMLNoTags SIZE
              This option sets the maximum size of a normalized HTML file to scan.
              HTML files larger than this value after normalization will not be scanned.
              Negative values are not allowed.
              Default: 2M

       MaxScriptNormalize SIZE
              This option sets the maximum size of a script file to normalize.
              Script content larger than this value will not be normalized or scanned.
              Negative values are not allowed.
              Default: 5M

       MaxZipTypeRcg SIZE
              This option sets the 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.
              Negative values are not allowed.
              WARNING: setting this limit too high may result in severe damage or impact  perfor‐
              mance.
              Default: 1M

       MaxPartitions SIZE
              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 par‐
              titions scanned.
              Negative values are not allowed.
              WARNING:  setting this limit too high may result in severe damage or impact perfor‐
              mance.
              Default: 50

       MaxIconsPE SIZE
              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 perfor‐
              mance.
              Default: 100

       MaxRecHWP3 NUMBER
              This option sets the maximum recursive calls to HWP3 parsing function.
              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 perfor‐
              mance.
              Default: 16

       PCREMatchLimit NUMBER
              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: 10000

       PCRERecMatchLimit NUMBER
              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: 5000

       PCREMaxFileSize SIZE
              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 perfor‐
              mance.
              Default: 25M

       ScanOnAccess BOOL
              This option enables on-access scanning (Linux only)
              Default: disabled

       OnAccessIncludePath STRING
              This option specifies a directory (including all files and directories inside  it),
              which should be scanned on access. This option can be used multiple times.
              Default: disabled

       OnAccessExcludePath STRING
              This  option  allows  excluding directories from on-access scanning. It can be used
              multiple times.
              Default: disabled

       OnAccessExcludeRootUID BOOL
              With this option you can whitelist the root UID (0). Processes run under root  will
              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

       OnAccessExcludeUID NUMBER
              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).
              Note: 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 OnAccessEx‐
              cludeUID is not guaranteed to prevent every access by the specified uid from  trig‐
              gering a scan (unless OnAccessPrevention is enabled).
              Default: disabled

       OnAccessMaxFileSize SIZE
              Files larger than this value will not be scanned in on access.
              Default: 5M

       OnAccessMountPath STRING
              Specifies  a  mount  point  (including  all  files and directories under it), which
              should be scanned on access. This option can be used multiple times.
              Default: disabled

       OnAccessDisableDDD BOOL
              Disables the dynamic directory determination system which  allows  for  recursively
              watching include paths.
              Default: no

       OnAccessPrevention BOOL
              Enables fanotify blocking when malicious files are found.
              Default: disabled

       DisableCertCheck BOOL
              Disable authenticode certificate chain verification in PE files.
              Default: no

NOTES
       All  options  expressing  a size are limited to max 4GB. Values in excess will be reset to
       the maximum.

FILES
       /etc/clamav/clamd.conf

AUTHORS
       Tomasz Kojm <tkojm AT clamav.net>, Kevin Lin <klin AT sourcefire.com>

SEE ALSO
       clamd(8), clamdscan(1), clamav-milter(8), freshclam(1), freshclam.conf(5)



ClamAV 0.100.0                           December 4, 2013                           clamd.conf(5)


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