clamav-milter.conf

clamav-milter.conf(5) Clam AntiVirus clamav-milter.conf(5)

NAME

   clamav-milter.conf - Configuration file for clamav-milter

DESCRIPTION

   clamav-milter.conf contains the configuration options for clamav-milter(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.

   NUMBER Unsigned integer.

MAIN OPTIONS

   Example
          If this option is set clamav-milter will not run.

   MilterSocket STRING
          Define the interface through which we communicate with sendmail. This option is mandatory!
          Possible formats are:
          [[unix|local]:]/path/to/file - to specify a unix domain socket
          inet:port@[hostname|ip-address] - to specify an ipv4 socket
          inet6:port@[hostname|ip-address] - to specify an ipv6 socket
          Default: unset

   MilterSocketGroup STRING
          Define the group ownership for the (unix) milter socket.
          Default: disabled (the primary group of the user running clamd)

   MilterSocketMode STRING
          Sets the permissions on the (unix) milter socket to the specified mode.
          Default: disabled (obey umask)

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

   User STRING
          Run as another user (clamav-milter must be started by root for this option to work)
          Default: unset (don´t drop privileges)

   ReadTimeout NUMBER
          Waiting for data from clamd will timeout after this time (seconds).
          Default: 120

   Foreground BOOL
          Don´t fork into background.
          Default: no

   Chroot STRING
          Chroot to the specified directory. Chrooting is performed just after reading the config file and before dropping privileges.
          Default: unset (don´t chroot)

   PidFile STRING
          Write the daemon's pid to the specified file.
          Default: disabled

   TemporaryDirectory STRING
          Optional path to the global temporary directory.
          Default: system specific (usually /tmp or /var/tmp).

CLAMD OPTIONS

   ClamdSocket STRING
          Define the clamd socket to connect to for scanning. This option is mandatory! Syntax:
          ClamdSocket unix:path
          ClamdSocket tcp:host:port
          The first syntax specifies a local unix socket (needs an absolute path) e.g.:
          ClamdSocket unix:/run/clamav/clamd.sock
          The second syntax specifies a tcp local or remote tcp socket: the host can be a hostname or an ip address; the ":port" field is only required for IPv6 addresses,  otherwise  it
          defaults to 3310 e.g.:
          ClamdSocket tcp:192.168.0.1
          This option can be repeated several times with different sockets or even with the same socket: clamd servers will be selected in a round-robin fashion.
          Default: no default

EXCLUSIONS

   LocalNet STRING
          Messages  originating  from these hosts/networks will not be scanned. This option takes a host(name)/mask pair in CIRD notation and can be repeated several times. If "/mask" is
          omitted, a host is assumed. To specify a locally originated, non-smtp, email use the keyword "local"
          Default: unset (scan everything regardless of the origin)

   AllowList STRING
          This option specifies a file which contains a list of basic POSIX regular expressions. Addresses (sent to or from - see below) matching these regexes  will not be scanned.  Op‐
          tionally each line can start with the string "From:" or "To:" (note: no whitespace after the colon) indicating if it is,  respectively, the sender or recipient that  is  to  be
          allowed. If the field is missing, "To:" is assumed.  Lines starting with #, : or ! are ignored.
          Default: unset (no exclusion applied)

   SkipAuthenticated STRING
          Messages  from  authenticated  SMTP  users  matching this extended POSIX regular expression (egrep-like) will not be scanned.  As an alternative, a file containing a plain (not
          regex) list of names (one per line) can be specified using the prefix "file:".  e.g. SkipAuthenticated file:/etc/good_guys. Note: this is the AUTH login name!
          Default: unset (no allowing based on SMTP auth)

   MaxFileSize SIZE
          Messages larger than this value won´t be scanned. Make sure this value is lower or equal than StreamMaxLength in clamd.conf
          Default: 100M

ACTIONS

   The following group of options controls the delivery process under  different circumstances. The following actions are available:
   - Accept: The message is accepted for delivery
   - Reject: Immediately refuse delivery (a 5xx error is returned to the peer)
   - Defer: Return a temporary failure message (4xx) to the peer
   - Blackhole (not available for OnFail): Like Accept but the message is sent to oblivion
   - Quarantine (not available for OnFail): Like Accept but message is quarantined instead of being delivered. NOTE: In Sendmail the quarantine queue can be examined via mailq  -qQ.  For
   Postfix this causes the message to be placed on hold.

   OnClean STRING
          Action to be performed on clean messages (mostly useful for testing)
          Default: Accept

   OnInfected STRING
          Action to be performed on infected messages
          Default: Quarantine

   OnFail STRING
          Action to be performed on error conditions (this includes failure to allocate data structures, no scanners available, network timeouts, unknown scanner replies and the like)
          Default: Defer

   RejectMsg STRING
          This  option  allows you to set a specific rejection reason for infected messages and it´s therefore only useful together with "OnInfected Reject". The string "%v", if present,
          will be replaced with the virus name.
          Default: MTA specific

   AddHeader STRING
          If this option is set to "Replace" (or "Yes"), an "X-Virus-Scanned" and an "X-Virus-Status" headers will be attached to each  processed  message,  possibly  replacing  existing
          headers.   If  it  is set to Add, the X-Virus headers are added possibly on top of the existing ones. Note that while "Replace" can potentially break DKIM signatures, "Add" may
          confuse procmail and similar filters.
          Default: no

   ReportHostname STRING
          When AddHeader is in use, this option allows you to set the reported hostname. This may be desirable in order to avoid leaking internal names. If unset the real machine name is
          used.
          Default: disabled

   VirusAction STRING
          Execute a command (possibly searching PATH) when an infected message is found. The following parameters are passed to the invoked program in this order: virus name,  queue  id,
          sender,  destination, subject, message id, message date. Note #1: this requires MTA macroes to be available (see LogInfected below). Note #2: the process is invoked in the con‐
          text of clamav-milter. Note #3: clamav-milter will wait for the process to exit. Be quick or fork to avoid unnecessary delays in email delivery.
          Default: disabled

LOGGING OPTIONS

   LogFile STRING
          Enable logging to selected file.
          Default: no

   LogFileUnlock BOOL
          Disable a system lock that protects against running clamd with the same configuration file multiple times.
          Default: no

   LogFileMaxSize SIZE
          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.
          Default: 1M

   LogTime BOOL
          Log time for each message.
          Default: no

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

   LogFacility STRING
          Specify the type of syslog messages - please refer to 'man syslog' for facility names.
          Default: LOG_LOCAL6

   LogVerbose BOOL
          Enable verbose logging.
          Default: no

   LogInfected STRING
          This option allows you to tune what is logged when a message is infected. Possible values are Off (the default - nothing is logged), Basic (minimal info logged), Full  (verbose
          info logged)
          Note:  For  this  to  work  properly  in  sendmail,  make  sure  the  msg_id,  mail_addr,  rcpt_addr  and  i  macroes are available in eom. In other words add a line like: Mil‐
          ter.macros.eom={msg_id}, {mail_addr}, {rcpt_addr}, i to your .cf file. Alternatively use the macro: define(`confMILTER_MACROS_EOM', `{msg_id}, {mail_addr}, {rcpt_addr}, i')
          Postfix should be working fine with the default settings.
          Default: disabled

   LogClean STRING
          This option allows you to tune what is logged when no threat is found in a scanned message.
          See LogInfected for possible values and caveats.
          Useful in debugging but drastically increases the log size.
          Default: disabled

   SupportMultipleRecipients BOOL
          This option affects the behaviour of LogInfected, LogClean and VirusAction  when a message with multiple recipients is scanned:
          If SupportMultipleRecipients is off (the default) then one single log entry is generated for the message and, in case the message is determined to be malicious, the command in‐
          dicated by VirusAction is executed just once. In both cases only the last recipient is reported.
          If SupportMultipleRecipients is on then one line is logged for each recipient and the command indicated by VirusAction is also executed once for each recipient.
          Note: although it's probably a good idea to enable this option, the default value is currently set to off for legacy reasons.
          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/clamav-milter.conf

AUTHOR

   aCaB <acab@clamav.net>