amavis (anti-virus, anti-spam)

配置反毒，反拉圾邮件过程

1. main.cf

   debian:/etc/postfix# postconf -e 'content_filter = smtp-amavis:[127.0.0.1]:10024'

2. master.cf

   debian:/etc/postfix# vi master.cf smtp-amavis unix - - n - 2 smtp -o smtp_data_done_timeout=1200s -o smtp_never_send_ehlo=yes -o disable_dns_lookups=yes 127.0.0.1:10025 inet n - n - - smtpd -o content_filter= -o local_recipient_maps= -o smtpd_helo_restrictions= -o smtpd_client_restrictions= -o smtpd_sender_restrictions= -o smtpd_recipient_restrictions=permit_mynetworks,reject -o mynetworks=127.0.0.0/8

   Chroot 监狱模式 建议使用，这样安全性更高．

   smtp-amavis unix - - y - 2 smtp -o smtp_data_done_timeout=1200s -o smtp_never_send_ehlo=yes -o disable_dns_lookups=yes 127.0.0.1:10025 inet n - y - - smtpd -o content_filter= -o local_recipient_maps= -o smtpd_helo_restrictions= -o smtpd_client_restrictions= -o smtpd_sender_restrictions= -o smtpd_recipient_restrictions=permit_mynetworks,reject -o mynetworks=127.0.0.0/8

3. amavisd.conf

   debian:~# cd /etc/amavis/ debian:/etc/amavis# debian:/etc/amavis# vi /etc/amavis/amavisd.conf $mydomain = 'example.net'; # (no useful default) $myhostname = 'mail.example.net'; # fqdn of this host, default by uname(3) $log_level = 2; # (defaults to 0) $final_virus_destiny = D_DISCARD; # (defaults to D_BOUNCE) $final_banned_destiny = D_BOUNCE; # (defaults to D_BOUNCE) $final_spam_destiny = D_PASS; # (defaults to D_REJECT) $final_bad_header_destiny = D_PASS; # (defaults to D_PASS), D_BOUNCE suggested # Debian 默认支持 Clam Antivirus-clamd ### http://www.clamav.net/ ['Clam Antivirus-clamd', \_daemon, ["CONTSCAN {}\n", "/var/run/clamav/clamd.ctl"], qr/\bOK$/, qr/\bFOUND$/, qr/^.*?: (?!Infected Archive)(.*) FOUND$/ ], # NOTE: run clamd under the same user as amavisd; match the socket # name (LocalSocket) in clamav.conf to the socket name in this entry # When running chrooted one may prefer: ["CONTSCAN {}\n","$MYHOME/clamd"],

   Example 6. amavisd.conf

   use strict; # Configuration file for amavisd-new # Defaults modified for the Debian amavisd-new package # $Id: amavisd.conf,v 1.27 2004/07/31 19:43:41 hmh Exp $ # # This software is licensed under the GNU General Public License (GPL). # See comments at the start of amavisd-new for the whole license text. #Sections: # Section I - Essential daemon and MTA settings # Section II - MTA specific # Section III - Logging # Section IV - Notifications/DSN, BOUNCE/REJECT/DROP/PASS destiny, quarantine # Section V - Per-recipient and per-sender handling, whitelisting, etc. # Section VI - Resource limits # Section VII - External programs, virus scanners, SpamAssassin # Section VIII - Debugging #GENERAL NOTES: # This file is a normal Perl code, interpreted by Perl itself. # - make sure this file (or directory where it resides) is NOT WRITABLE # by mere mortals (not even vscan/amavis; best to make it owned by root), # otherwise it represents a severe security risk! # - for values which are interpreted as booleans, it is recommended # to use 1 for true, and 0 or undef or '' for false. # THIS IS DIFFERENT FROM OLD AMAVIS VERSIONS where "no" also meant false, # now it means true, like any nonempty string does! # - Perl syntax applies. Most notably: strings in "" may include variables # (which start with $ or @); to include characters @ and $ in double # quoted strings, precede them by a backslash; in single-quoted strings # the $ and @ lose their special meaning, so it is usually easier to use # single quoted strings (or qw operator) for e-mail addresses. # Still, in both cases a backslash needs to be doubled. # - variables with names starting with a '@' are lists, the values assigned # to them should be lists as well, e.g. ('one@foo', $mydomain, "three"); # note the comma-separation and parenthesis. If strings in the list # do not contain spaces nor variables, a Perl operator qw() may be used # as a shorthand to split its argument on whitespace and produce a list # of strings, e.g. qw( one@foo example.com three ); Note that the argument # to qw is quoted implicitly and no variable interpretation is done within # (no '$' variable evaluations). The #-initiated comments can NOT be used # within a string. In other words, $ and # lose their special meaning # within a qw argument, just like within '...' strings. # - all e-mail addresses in this file and as used internally by the daemon # are in their raw (rfc2821-unquoted and non-bracketed) form, i.e. # Bob "Funny" [email protected], not: "Bob \"Funny\" Dude"@example.com # and not <"Bob \"Funny\" Dude"@example.com>; also: '' and not '

   '. # - the term 'default value' in examples below refers to the value of a # variable pre-assigned to it by the program; any explicit assignment # to a variable in this configuration file overrides the default value; # # Section I - Essential daemon and MTA settings # # $MYHOME serves as a quick default for some other configuration settings. # More refined control is available with each individual setting further down. # $MYHOME is not used directly by the program. No trailing slash! $MYHOME = '/var/lib/amavis'; # (default is '/var/amavis') # $mydomain serves as a quick default for some other configuration settings. # More refined control is available with each individual setting further down. # $mydomain is never used directly by the program. $mydomain = 'example.net'; # (no useful default) $myhostname = 'mail.example.net'; # fqdn of this host, default by uname(3) # Set the user and group to which the daemon will change if started as root # (otherwise just keeps the UID unchanged, and these settings have no effect): $daemon_user = 'amavis'; # (no default (undef)) $daemon_group = 'amavis'; # (no default (undef)) # Runtime working directory (cwd), and a place where # temporary directories for unpacking mail are created. # if you change this, you might want to modify the cleanup() # function in /etc/init.d/amavisd-new # (no trailing slash, may be a scratch file system) $TEMPBASE = $MYHOME; # (must be set if other config vars use is) #$TEMPBASE = "$MYHOME/tmp"; # prefer to keep home dir /var/amavis clean? # $helpers_home sets environment variable HOME, and is passed as option # 'home_dir_for_helpers' to Mail::SpamAssassin::new. It should be a directory # on a normal persistent file system, not a scratch or temporary file system #$helpers_home = $MYHOME; # (defaults to $MYHOME) # Run the daemon in the specified chroot jail if nonempty: #$daemon_chroot_dir = $MYHOME; # (default is undef, meaning: do not chroot) $pid_file = "/var/run/amavis/amavisd.pid"; # (default: "$MYHOME/amavisd.pid") $lock_file = "/var/run/amavis/amavisd.lock"; # (default: "$MYHOME/amavisd.lock") # set environment variables if you want (no defaults): $ENV{TMPDIR} = $TEMPBASE; # wise to set TMPDIR, but not obligatory #... # MTA SETTINGS, UNCOMMENT AS APPROPRIATE, # both $forward_method and $notify_method default to 'smtp:127.0.0.1:10025' # POSTFIX, or SENDMAIL in dual-MTA setup, or EXIM V4 # (set host and port number as required; host can be specified # as IP address or DNS name (A or CNAME, but MX is ignored) #$forward_method = 'smtp:127.0.0.1:10025'; # where to forward checked mail #$notify_method = $forward_method; # where to submit notifications # NOTE: The defaults (above) are good for Postfix or dual-sendmail. You MUST # uncomment the appropriate settings below if using other setups! # SENDMAIL MILTER, using amavis-milter.c helper program: # SEE amavisd-new-milter package docs FOR DEBIAN INSTRUCTIONS #$forward_method = undef; # no explicit forwarding, sendmail does it by itself # milter; option -odd is needed to avoid deadlocks #$notify_method = 'pipe:flags=q argv=/usr/sbin/sendmail -Ac -i -odd -f ${sender} -- ${recipient}'; # just a thought: can we use use -Am instead of -odd ? # SENDMAIL (old non-milter setup, as relay): #$forward_method = 'pipe:flags=q argv=/usr/sbin/sendmail -C/etc/sendmail.orig.cf -i -f ${sender} -- ${recipient}'; #$notify_method = $forward_method; # SENDMAIL (old non-milter setup, amavis.c calls local delivery agent): #$forward_method = undef; # no explicit forwarding, amavis.c will call LDA #$notify_method = 'pipe:flags=q argv=/usr/sbin/sendmail -Ac -i -f ${sender} -- ${recipient}'; # EXIM v3 (not recommended with v4 or later, which can use SMTP setup instead): #$forward_method = 'pipe:flags=q argv=/usr/sbin/exim -oMr scanned-ok -i -f ${sender} -- ${recipient}'; #$notify_method = $forward_method; # prefer to collect mail for forwarding as BSMTP files? #$forward_method = "bsmtp:$MYHOME/out-%i-%n.bsmtp"; #$notify_method = $forward_method; # Net::Server pre-forking settings # You may want $max_servers to match the width of your MTA pipe # feeding amavisd, e.g. with Postfix the 'Max procs' field in the # master.cf file, like the '2' in the: smtp-amavis unix - - n - 2 smtp # $max_servers = 2; # number of pre-forked children (default 2) $max_requests = 10; # retire a child after that many accepts (default 10) $child_timeout=5*60; # abort child if it does not complete each task in n sec # (default: 8*60 seconds) # Check also the settings of @av_scanners at the end if you want to use # virus scanners. If not, you may want to delete the whole long assignment # to the variable @av_scanners, which will also remove the virus checking # code (e.g. if you only want to do spam scanning). # Here is a QUICK WAY to completely DISABLE some sections of code # that WE DO NOT WANT (it won't even be compiled-in). # For more refined controls leave the following two lines commented out, # and see further down what these two lookup lists really mean. # # @bypass_virus_checks_acl = qw( . ); # uncomment to DISABLE anti-virus code # @bypass_spam_checks_acl = qw( . ); # uncomment to DISABLE anti-spam code # # Any setting can be changed with a new assignment, so make sure # you do not unintentionally override these settings further down! @bypass_spam_checks_acl = qw( . ); # No default dependency on spamassassin # Lookup list of local domains (see README.lookups for syntax details) # # NOTE: # For backwards compatibility the variable names @local_domains (old) and # @local_domains_acl (new) are synonyms. For consistency with other lookups # the name @local_domains_acl is now preferred. It also makes it more # obviously distinct from the new %local_domains hash lookup table. # # local_domains* lookup tables are used in deciding whether a recipient # is local or not, or in other words, if the message is outgoing or not. # This affects inserting spam-related headers for local recipients, # limiting recipient virus notifications (if enabled) to local recipients, # in deciding if address extension may be appended, and in SQL lookups # for non-fqdn addresses. Set it up correctly if you need features # that rely on this setting (or just leave empty otherwise). # # With Postfix (2.0) a quick reminder on what local domains normally are: # a union of domains specified in: $mydestination, $virtual_alias_domains, # $virtual_mailbox_domains, and $relay_domains. # @local_domains_acl = ( ".$mydomain" ); # $mydomain and its subdomains # @local_domains_acl = ( ".$mydomain", "my.other.domain" ); # @local_domains_acl = qw(); # default is empty, no recipient treated as local # @local_domains_acl = qw( .example.com ); # @local_domains_acl = qw( .example.com !host.sub.example.net .sub.example.net ); # or alternatively(A), using a Perl hash lookup table, which may be assigned # directly, or read from a file, one domain per line; comments and empty lines # are ignored, a dot before a domain name implies its subdomains: # #read_hash(\%local_domains, '/etc/amavis/local_domains'); #or alternatively(B), using a list of regular expressions: # $local_domains_re = new_RE( qr'[@.]example\.com$'i ); # # see README.lookups for syntax and semantics # # Section II - MTA specific (defaults should be ok) # # if $relayhost_is_client is true, the IP address in $notify_method and # $forward_method is dynamically overridden with SMTP client peer address # (if available), which makes it possible for several hosts to share one # daemon. The static port number is also overridden, and is dynamically # calculated as being one above the incoming SMTP/LMTP session port number. # # These are logged at level 3, so enable logging until you know you got it # right. $relayhost_is_client = 0; # (defaults to false) $insert_received_line = 1; # behave like MTA: insert 'Received:' header # (does not apply to sendmail/milter) # (default is true (1) ) # AMAVIS-CLIENT PROTOCOL INPUT SETTINGS (e.g. with sendmail milter) # (used with amavis helper clients like amavis-milter.c and amavis.c, # NOT needed for Postfix and Exim or dual-sendmail - keep it undefined.) #$unix_socketname = "/var/lib/amavis/amavisd.sock"; # amavis helper protocol socket $unix_socketname = undef; # disable listening on a unix socket # (default is undef, i.e. disabled) # Do we receive quoted or raw addresses from the helper program? # (does not apply to SMTP; defaults to true) #$gets_addr_in_quoted_form = 1; # "Bob \"Funny\" Dude"@example.com #$gets_addr_in_quoted_form = 0; # Bob "Funny" [email protected] # SMTP SERVER (INPUT) PROTOCOL SETTINGS (e.g. with Postfix, Exim v4, ...) # (used when MTA is configured to pass mail to amavisd via SMTP or LMTP) $inet_socket_port = 10024; # accept SMTP on this local TCP port # (default is undef, i.e. disabled) # multiple ports may be provided: $inet_socket_port = [10024, 10026, 10028]; # SMTP SERVER (INPUT) access control # - do not allow free access to the amavisd SMTP port !!! # # when MTA is at the same host, use the following (one or the other or both): $inet_socket_bind = '127.0.0.1'; # limit socket bind to loopback interface # (default is '127.0.0.1') @inet_acl = qw( 127.0.0.1 ); # allow SMTP access only from localhost IP # (default is qw( 127.0.0.1 ) ) # when MTA (one or more) is on a different host, use the following: # @inet_acl = qw(127/8 10.1.0.1 10.1.0.2); # adjust the list as appropriate # $inet_socket_bind = undef; # bind to all IP interfaces if undef # # Example1: # @inet_acl = qw( 127/8 10/8 172.16/12 192.168/16 ); # permit only SMTP access from loopback and rfc1918 private address space # # Example2: # @inet_acl = qw( !192.168.1.12 172.16.3.3 !172.16.3/255.255.255.0 # 127.0.0.1 10/8 172.16/12 192.168/16 ); # matches loopback and rfc1918 private address space except host 192.168.1.12 # and net 172.16.3/24 (but host 172.16.3.3 within 172.16.3/24 still matches) # # Example3: # @inet_acl = qw( 127/8 # !172.16.3.0 !172.16.3.127 172.16.3.0/25 # !172.16.3.128 !172.16.3.255 172.16.3.128/25 ); # matches loopback and both halves of the 172.16.3/24 C-class, # split into two subnets, except all four broadcast addresses # for these subnets # # See README.lookups for details on specifying access control lists. # # Section III - Logging # # true (e.g. 1) => syslog; false (e.g. 0) => logging to file $DO_SYSLOG = 1; # (defaults to false) #$SYSLOG_LEVEL = 'user.info'; # (facility.priority, default 'mail.info') # Log file (if not using syslog) $LOGFILE = "/var/log/amavis.log"; # (defaults to empty, no log) #NOTE: levels are not strictly observed and are somewhat arbitrary # 0: startup/exit/failure messages, viruses detected # 1: args passed from client, some more interesting messages # 2: virus scanner output, timing # 3: server, client # 4: decompose parts # 5: more debug details $log_level = 2; # (defaults to 0) # Customizable template for the most interesting log file entry (e.g. with # $log_level=0) (take care to properly quote Perl special characters like '\') # For a list of available macros see README.customize . # only log infected messages (useful with log level 0): # $log_templ = '[? %#V |[? %#F ||banned filename ([%F|,])]|infected ([%V|,])]# # [? %#V |[? %#F ||, from=[?%o|(?)|<%o>], to=[<%R>|,][? %i ||, quarantine %i]]# # |, from=[?%o|(?)|<%o>], to=[<%R>|,][? %i ||, quarantine %i]]'; # log both infected and noninfected messages (default): $log_templ = '[? %#V |[? %#F |[?%#D|Not-Delivered|Passed]|BANNED name/type (%F)]|INFECTED (%V)], # [?%o|(?)|<%o>] -> [<%R>|,][? %i ||, quarantine %i], Message-ID: %m, Hits: %c'; # # Section IV - Notifications/DSN, BOUNCE/REJECT/DROP/PASS destiny, quarantine # # Select notifications text encoding when Unicode-aware Perl is converting # text from internal character representation to external encoding (charset # in MIME terminology). Used as argument to Perl Encode::encode subroutine. # # to be used in RFC 2047-encoded header field bodies, e.g. in Subject: #$hdr_encoding = 'iso-8859-1'; # (default: 'iso-8859-1') # # to be used in notification body text: its encoding and Content-type.charset #$bdy_encoding = 'iso-8859-1'; # (default: 'iso-8859-1') # Default template texts for notifications may be overruled by directly # assigning new text to template variables, or by reading template text # from files. A second argument may be specified in a call to read_text(), # specifying character encoding layer to be used when reading from the # external file, e.g. 'utf8', 'iso-8859-1', or often just $bdy_encoding. # Text will be converted to internal character representation by Perl 5.8.0 # or later; second argument is ignored otherwise. See PerlIO::encoding, # Encode::PerlIO and perluniintro man pages. # # $notify_sender_templ = read_text('/var/amavis/notify_sender.txt'); # $notify_virus_sender_templ= read_text('/var/amavis/notify_virus_sender.txt'); # $notify_virus_admin_templ = read_text('/var/amavis/notify_virus_admin.txt'); # $notify_virus_recips_templ= read_text('/var/amavis/notify_virus_recips.txt'); # $notify_spam_sender_templ = read_text('/var/amavis/notify_spam_sender.txt'); # $notify_spam_admin_templ = read_text('/var/amavis/notify_spam_admin.txt'); # If notification template files are collectively available in some directory, # use read_l10n_templates which calls read_text for each known template. # # read_l10n_templates('/etc/amavis/en_US'); # # Debian available locales: en_US, pt_BR, de_DE, it_IT read_l10n_templates('en_US', '/etc/amavis'); # Here is an overall picture (sequence of events) of how pieces fit together # (only virus controls are shown, spam controls work the same way): # # bypass_virus_checks? ==> PASS # no viruses? ==> PASS # log virus if $log_templ is nonempty # quarantine if $virus_quarantine_to is nonempty # notify admin if $virus_admin (lookup) nonempty # notify recips if $warnvirusrecip and (recipient is local or $warn_offsite) # add address extensions if adding extensions is enabled and virus will pass # send (non-)delivery notifications # to sender if DSN needed (BOUNCE or ($warn_virus_sender and D_PASS)) # virus_lovers or final_destiny==D_PASS ==> PASS # DISCARD (2xx) or REJECT (5xx) (depending on final_*_destiny) # # Equivalent flow diagram applies for spam checks. # If a virus is detected, spam checking is skipped entirely. # The following symbolic constants can be used in *destiny settings: # # D_PASS mail will pass to recipients, regardless of bad contents; # # D_DISCARD mail will not be delivered to its recipients, sender will NOT be # notified. Effectively we lose mail (but will be quarantined # unless disabled). Losing mail is not decent for a mailer, # but might be desired. # # D_BOUNCE mail will not be delivered to its recipients, a non-delivery # notification (bounce) will be sent to the sender by amavisd-new; # Exception: bounce (DSN) will not be sent if a virus name matches # $viruses_that_fake_sender_re, or to messages from mailing lists # (Precedence: bulk|list|junk); # # D_REJECT mail will not be delivered to its recipients, sender should # preferably get a reject, e.g. SMTP permanent reject response # (e.g. with milter), or non-delivery notification from MTA # (e.g. Postfix). If this is not possible (e.g. different recipients # have different tolerances to bad mail contents and not using LMTP) # amavisd-new sends a bounce by itself (same as D_BOUNCE). # # Notes: # D_REJECT and D_BOUNCE are similar, the difference is in who is responsible # for informing the sender about non-delivery, and how informative # the notification can be (amavisd-new knows more than MTA); # With D_REJECT, MTA may reject original SMTP, or send DSN (delivery status # notification, colloquially called 'bounce') - depending on MTA; # Best suited for sendmail milter, especially for spam. # With D_BOUNCE, amavisd-new (not MTA) sends DSN (can better explain the # reason for mail non-delivery, but unable to reject the original # SMTP session). Best suited to reporting viruses, and for Postfix # and other dual-MTA setups, which can't reject original client SMTP # session, as the mail has already been enqueued. $final_virus_destiny = D_DISCARD; # (defaults to D_BOUNCE) $final_banned_destiny = D_BOUNCE; # (defaults to D_BOUNCE) $final_spam_destiny = D_PASS; # (defaults to D_REJECT) $final_bad_header_destiny = D_PASS; # (defaults to D_PASS), D_BOUNCE suggested # Alternatives to consider for spam: # - use D_PASS if clients will do filtering based on inserted mail headers; # - use D_DISCARD, if kill_level is set safely high; # - use D_BOUNCE instead of D_REJECT if not using milter; # # D_BOUNCE is preferred for viruses, but consider: # - use D_DISCARD to avoid bothering the rest of the network, it is hopeless # to try to keep up with the viruses that faker the envelope sender anyway, # and bouncing only increases the network cost of viruses for everyone # - use D_PASS (or virus_lovers) and $warnvirussender=1 to deliver viruses; # - use D_REJECT instead of D_BOUNCE if using milter and under heavy # virus storm; # # Don't bother to set both D_DISCARD and $warn*sender=1, it will get mapped # to D_BOUNCE. # # The separation of *_destiny values into D_BOUNCE, D_REJECT, D_DISCARD # and D_PASS made settings $warnvirussender and $warnspamsender only still # useful with D_PASS. # The following $warn*sender settings are ONLY used when mail is # actually passed to recipients ($final_*_destiny=D_PASS, or *_lovers*). # Bounces or rejects produce non-delivery status notification anyway. # Notify virus sender? #$warnvirussender = 1; # (defaults to false (undef)) # Notify spam sender? #$warnspamsender = 1; # (defaults to false (undef)) # Notify sender of banned files? #$warnbannedsender = 1; # (defaults to false (undef)) # Notify sender of syntactically invalid header containing non-ASCII characters? #$warnbadhsender = 1; # (defaults to false (undef)) # Notify virus (or banned files) RECIPIENT? # (not very useful, but some policies demand it) #$warnvirusrecip = 1; # (defaults to false (undef)) #$warnbannedrecip = 1; # (defaults to false (undef)) # Notify also non-local virus/banned recipients if $warn*recip is true? # (including those not matching local_domains*) #$warn_offsite = 1; # (defaults to false (undef), i.e. only notify locals) # Treat envelope sender address as unreliable and don't send sender # notification / bounces if name(s) of detected virus(es) match the list. # Note that virus names are supplied by external virus scanner(s) and are # not standardized, so virus names may need to be adjusted. # See README.lookups for syntax, check also README.policy-on-notifications # $viruses_that_fake_sender_re = new_RE( qr'nimda|hybris|klez|bugbear|yaha|braid|sobig|fizzer|palyh|peido|holar'i, qr'tanatos|lentin|bridex|mimail|trojan\.dropper|dumaru|parite|spaces'i, qr'dloader|galil|gibe|swen|netwatch|bics|sbrowse|sober|rox|val(hal)?la'i, qr'frethem|sircam|be?agle|tanx|mydoom|novarg|shimg|netsky|somefool|moodown'i, qr'@mm|@MM', # mass mailing viruses as labeled by f-prot and uvscan qr'Worm'i, # worms as labeled by ClamAV, Kaspersky, etc [qr'^(EICAR|Joke\.|Junk\.)'i => 0], [qr'^(WM97|OF97|W95/CIH-|JS/Fort)'i => 0], [qr/.*/ => 1], # true by default (remove or comment-out if undesired) ); # where to send ADMIN VIRUS NOTIFICATIONS (should be a fully qualified address) # - the administrator address may be a simple fixed e-mail address (a scalar), # or may depend on the SENDER address (e.g. its domain), in which case # a ref to a hash table can be specified (specify lower-cased keys, # dot is a catchall, see README.lookups). # # Empty or undef lookup disables virus admin notifications. # $virus_admin = undef; # do not send virus admin notifications (default) # $virus_admin = {'not.example.com' => '', '.' => '[email protected]'}; # $virus_admin = '[email protected]'; $virus_admin = "postmaster\@$mydomain"; # due to D_DISCARD default # equivalent to $virus_admin, but for spam admin notifications: # $spam_admin = "spamalert\@$mydomain"; # $spam_admin = undef; # do not send spam admin notifications (default) # $spam_admin = {'not.example.com' => '', '.' => '[email protected]'}; #advanced example, using a hash lookup table: #$virus_admin = { # '[email protected]' => '[email protected]', # '.sub1.example.com' => '[email protected]', # '.sub2.example.com' => '', # don't send admin notifications # 'a.sub3.example.com' => '[email protected]', # '.sub3.example.com' => '[email protected]', # '.example.com' => '[email protected]', # catchall for our virus senders # '.' => '[email protected]', # catchall for the rest #}; # whom notification reports are sent from (ENVELOPE SENDER); # may be a null reverse path, or a fully qualified address: # (admin and recip sender addresses default to $mailfrom # for compatibility, which in turn defaults to undef (empty) ) # If using strings in double quotes, don't forget to quote @, i.e. \@ # #$mailfrom_notify_admin = "virusalert\@$mydomain"; #$mailfrom_notify_recip = "virusalert\@$mydomain"; #$mailfrom_notify_spamadmin = "spam.police\@$mydomain"; # 'From' HEADER FIELD for sender and admin notifications. # This should be a replyable address, see rfc1894. Not to be confused # with $mailfrom_notify_sender, which is the envelope return address # and should be empty (null reverse path) according to rfc2821. # # The syntax of the 'From' header field is specified in rfc2822, section # '3.4. Address Specification'. Note in particular that display-name must be # a quoted-string if it contains any special characters like spaces and dots. # # $hdrfrom_notify_sender = "amavisd-new @$mydomain>"; # $hdrfrom_notify_sender = 'amavisd-new example.com>'; # $hdrfrom_notify_sender = '"Content-Filter Master" example.com>'; # (defaults to: "amavisd-new @$myhostname>") # $hdrfrom_notify_admin = $mailfrom_notify_admin; # (defaults to: $mailfrom_notify_admin) # $hdrfrom_notify_spamadmin = $mailfrom_notify_spamadmin; # (defaults to: $mailfrom_notify_spamadmin) # whom quarantined messages appear to be sent from (envelope sender); # keeps original sender if undef, or set it explicitly, default is undef $mailfrom_to_quarantine = ''; # override sender address with null return path # Location to put infected mail into: (applies to 'local:' quarantine method) # empty for not quarantining, may be a file (mailbox), # or a directory (no trailing slash) # (the default value is undef, meaning no quarantine) # $QUARANTINEDIR = '/var/lib/amavis/virusmails'; #$virus_quarantine_method = "local:virus-%i-%n"; # default #$spam_quarantine_method = "local:spam-%b-%i-%n"; # default # #use the new 'bsmtp:' method as an alternative to the default 'local:' #$virus_quarantine_method = "bsmtp:$QUARANTINEDIR/virus-%i-%n.bsmtp"; #$spam_quarantine_method = "bsmtp:$QUARANTINEDIR/spam-%b-%i-%n.bsmtp"; # When using the 'local:' quarantine method (default), the following applies: # # A finer control of quarantining is available through variable # $virus_quarantine_to/$spam_quarantine_to. It may be a simple scalar string, # or a ref to a hash lookup table, or a regexp lookup table object, # which makes possible to set up per-recipient quarantine addresses. # # The value of scalar $virus_quarantine_to/$spam_quarantine_to (or a # per-recipient lookup result from the hash table %$virus_quarantine_to) # is/are interpreted as follows: # # VARIANT 1: # empty or undef disables quarantine; # # VARIANT 2: # a string NOT containing an '@'; # amavisd will behave as a local delivery agent (LDA) and will quarantine # viruses to local files according to hash %local_delivery_aliases (pseudo # aliases map) - see subroutine mail_to_local_mailbox() for details. # Some of the predefined aliases are 'virus-quarantine' and 'spam-quarantine'. # Setting $virus_quarantine_to ($spam_quarantine_to) to this string will: # # * if $QUARANTINEDIR is a directory, each quarantined virus will go # to a separate file in the $QUARANTINEDIR directory (traditional # amavis style, similar to maildir mailbox format); # # * otherwise $QUARANTINEDIR is treated as a file name of a Unix-style # mailbox. All quarantined messages will be appended to this file. # Amavisd child process must obtain an exclusive lock on the file during # delivery, so this may be less efficient than using individual files # or forwarding to MTA, and it may not work across NFS or other non-local # file systems (but may be handy for pickup of quarantined files via IMAP # for example); # # VARIANT 3: # any email address (must contain '@'). # The e-mail messages to be quarantined will be handed to MTA # for delivery to the specified address. If a recipient address local to MTA # is desired, you may leave the domain part empty, e.g. 'infected@', but the # '@' character must nevertheless be included to distinguish it from variant 2. # # This method enables more refined delivery control made available by MTA # (e.g. its aliases file, other local delivery agents, dealing with # privileges and file locking when delivering to user's mailbox, nonlocal # delivery and forwarding, fan-out lists). Make sure the mail-to-be-quarantined # will not be handed back to amavisd for checking, as this will cause a loop # (hopefully broken at some stage)! If this can be assured, notifications # will benefit too from not being unnecessarily virus-scanned. # # By default this is safe to do with Postfix and Exim v4 and dual-sendmail # setup, but probably not safe with sendmail milter interface without # precaution. # (the default value is undef, meaning no quarantine) $virus_quarantine_to = 'virus-quarantine'; # traditional local quarantine #$virus_quarantine_to = 'infected@'; # forward to MTA for delivery #$virus_quarantine_to = "virus-quarantine\@$mydomain"; # similar #$virus_quarantine_to = '[email protected]'; # similar #$virus_quarantine_to = undef; # no quarantine # #$virus_quarantine_to = new_RE( # per-recip multiple quarantines # [qr'^user@example\.com$'i => 'infected@'], # [qr'^(.*)@example\.com$'i => 'virus-${1}@example.com'], # [qr'^(.*)(@[^@])?$'i => 'virus-${1}${2}'], # [qr/.*/ => 'virus-quarantine'] ); # similar for spam # (the default value is undef, meaning no quarantine) # $spam_quarantine_to = 'spam-quarantine'; #$spam_quarantine_to = "spam-quarantine\@$mydomain"; #$spam_quarantine_to = new_RE( # per-recip multiple quarantines # [qr'^(.*)@example\.com$'i => 'spam-${1}@example.com'], # [qr/.*/ => 'spam-quarantine'] ); # In addition to per-recip quarantine, a by-sender lookup is possible. It is # similar to $spam_quarantine_to, but the lookup key is the sender address: #$spam_quarantine_bysender_to = undef; # dflt: no by-sender spam quarantine # Add X-Virus-Scanned header field to mail? $X_HEADER_TAG = 'X-Virus-Scanned'; # (default: undef) # Leave empty to add no header # (default: undef) $X_HEADER_LINE = "by $myversion (Debian) at $mydomain"; # a string to prepend to Subject (for local recipients only) if mail could # not be decoded or checked entirely, e.g. due to password-protected archives $undecipherable_subject_tag = '***UNCHECKED*** '; # undef disables it $remove_existing_x_scanned_headers = 0; # leave existing X-Virus-Scanned alone #$remove_existing_x_scanned_headers= 1; # remove existing headers # (defaults to false) #$remove_existing_spam_headers = 0; # leave existing X-Spam* headers alone $remove_existing_spam_headers = 1; # remove existing spam headers if # spam scanning is enabled (default) # set $bypass_decode_parts to true if you only do spam scanning, or if you # have a good virus scanner that can deal with compression and recursively # unpacking archives by itself, and save amavisd the trouble. # Disabling decoding also causes banned_files checking to only see # MIME names and MIME content types, not the content classification types # as provided by the file(1) utility. # It is a double-edged sword, make sure you know what you are doing! # #$bypass_decode_parts = 1; # (defaults to false) # don't trust this file type or corresponding unpacker for this file type, # keep both the original and the unpacked file for a virus checker to see # (lookup key is what file(1) utility returned): # $keep_decoded_original_re = new_RE( # qr'^MAIL$', # retain full original message for virus checking (can be slow) qr'^MAIL-UNDECIPHERABLE$', # retain full mail if it contains undecipherables qr'^(ASCII(?! cpio)|text|uuencoded|xxencoded|binhex)'i, # qr'^Zip archive data', ); # Checking for banned MIME types and names. If any mail part matches, # the whole mail is rejected, much like the way viruses are handled. # A list in object $banned_filename_re can be defined to provide a list # of Perl regular expressions to be matched against each part's: # # * Content-Type value (both declared and effective mime-type), # including the possible security risk content types # message/partial and message/external-body, as specified by rfc2046; # # * declared (i.e. recommended) file names as specified by MIME subfields # Content-Disposition.filename and Content-Type.name, both in their # raw (encoded) form and in rfc2047-decoded form if applicable; # # * file content type as guessed by 'file' utility, both the raw # result from 'file', as well as short type name, classified # into names such as .asc, .txt, .html, .doc, .jpg, .pdf, # .zip, .exe, ... - see subroutine determine_file_types(). # This step is done only if $bypass_decode_parts is not true. # # * leave $banned_filename_re undefined to disable these checks # (giving an empty list to new_RE() will also always return false) $banned_filename_re = new_RE( # qr'^UNDECIPHERABLE$', # is or contains any undecipherable components qr'\.[^.]*\.(exe|vbs|pif|scr|bat|cmd|com|dll)$'i, # some double extensions qr'[{}]', # curly braces in names (serve as Class ID extensions - CLSID) # qr'.\.(exe|vbs|pif|scr|bat|cmd|com)$'i, # banned extension - basic # qr'.\.(ade|adp|bas|bat|chm|cmd|com|cpl|crt|exe|hlp|hta|inf|ins|isp|js| # jse|lnk|mdb|mde|msc|msi|msp|mst|pcd|pif|reg|scr|sct|shs|shb|vb| # vbe|vbs|wsc|wsf|wsh)$'ix, # banned extension - long # qr'.\.(mim|b64|bhx|hqx|xxe|uu|uue)$'i, # banned extension - WinZip vulnerab. # qr'^\.(zip|lha|tnef|cab)$'i, # banned file(1) types # qr'^\.exe$'i, # banned file(1) types # qr'^application/x-msdownload$'i, # banned MIME types # qr'^application/x-msdos-program$'i, qr'^message/partial$'i, qr'^message/external-body$'i, # block rfc2046 ); # See http://support.microsoft.com/default.aspx?scid=kb;EN-US;q262631 # and http://www.cknow.com/vtutor/vtextensions.htm # A little trick: a pattern qr'\.exe$' matches both a short type name '.exe', # as well as any file name which happens to end with .exe. If only matching # a file name is desired, but not the short name, a pattern qr'.\.exe$'i # or similar may be used, which requires that at least one character precedes # the '.exe', and so it will never match short file types, which always start # with a dot. # # Section V - Per-recipient and per-sender handling, whitelisting, etc. # # %virus_lovers, @virus_lovers_acl and $virus_lovers_re lookup tables: # (these should be considered policy options, they do not disable checks, # see bypass*checks for that!) # # Exclude certain RECIPIENTS from virus filtering by adding their lower-cased # envelope e-mail address (or domain only) to the hash %virus_lovers, or to # the access list @virus_lovers_acl - see README.lookups and examples. # Make sure the appropriate form (e.g. external/internal) of address # is used in case of virtual domains, or when mapping external to internal # addresses, etc. - this is MTA-specific. # # Notifications would still be generated however (see the overall # picture above), and infected mail (if passed) gets additional header: # X-AMaViS-Alert: INFECTED, message contains virus: ... # (header not inserted with milter interface!) # # NOTE (milter interface only): in case of multiple recipients, # it is only possible to drop or accept the message in its entirety - for all # recipients. If all of them are virus lovers, we'll accept mail, but if # at least one recipient is not a virus lover, we'll discard the message. # %bypass_virus_checks, @bypass_virus_checks_acl and $bypass_virus_checks_re # lookup tables: # (this is mainly a time-saving option, unlike virus_lovers* !) # # Similar in concept to %virus_lovers, a hash %bypass_virus_checks, # access list @bypass_virus_checks_acl and regexp list $bypass_virus_checks_re # are used to skip entirely the decoding, unpacking and virus checking, # but only if ALL recipients match the lookup. # # %bypass_virus_checks/@bypass_virus_checks_acl/$bypass_virus_checks_re # do NOT GUARANTEE the message will NOT be checked for viruses - this may # still happen when there is more than one recipient for a message, and # not all of them match these lookup tables. To guarantee virus delivery, # a recipient must also match %virus_lovers/@virus_lovers_acl lookups # (but see milter limitations above), # NOTE: it would not be clever to base virus checks on SENDER address, # since there are no guarantees that it is genuine. Many viruses # and spam messages fake sender address. To achieve selective filtering # based on the source of the mail (e.g. IP address, MTA port number, ...), # use mechanisms provided by MTA if available. # Similar to lookup tables controlling virus checking, there exist # spam scanning, banned names/types, and headers_checks control counterparts: # %spam_lovers, @spam_lovers_acl, $spam_lovers_re # %banned_files_lovers, @banned_files_lovers_acl, $banned_files_lovers_re # %bad_header_lovers, @bad_header_lovers_acl, $bad_header_lovers_re # and: # %bypass_spam_checks/@bypass_spam_checks_acl/$bypass_spam_checks_re # %bypass_banned_checks/@bypass_banned_checks_acl/$bypass_banned_checks_re # %bypass_header_checks/@bypass_header_checks_acl/$bypass_header_checks_re # See README.lookups for details about the syntax. # The following example disables spam checking altogether, # since it matches any recipient e-mail address (any address # is a subdomain of the top-level root DNS domain): # @bypass_spam_checks_acl = qw( . ); # @bypass_header_checks_acl = qw( [email protected] ); # @bad_header_lovers_acl = qw( [email protected] ); # See README.lookups for further detail, and examples below. # $virus_lovers{lc("postmaster\@$mydomain")} = 1; # $virus_lovers{lc('[email protected]')} = 1; # $virus_lovers{lc('[email protected]')} = 1; # $virus_lovers{lc('some.user@')} = 1; # this recipient, regardless of domain # $virus_lovers{lc('[email protected]')} = 0; # never, even if domain matches # $virus_lovers{lc('example.com')} = 1; # this domain, but not its subdomains # $virus_lovers{lc('.example.com')}= 1; # this domain, including its subdomains #or: # @virus_lovers_acl = qw( [email protected] !lab.xxx.com .xxx.com yyy.org ); # # $bypass_virus_checks{lc('[email protected]')} = 1; # @bypass_virus_checks_acl = qw( some.ddd !butnot.example.com .example.com ); # @virus_lovers_acl = qw( [email protected] ); # $virus_lovers_re = new_RE( qr'^(helpdesk|postmaster)@example\.com$'i ); # $spam_lovers{lc("postmaster\@$mydomain")} = 1; # $spam_lovers{lc('[email protected]')} = 1; # $spam_lovers{lc('[email protected]')} = 1; # @spam_lovers_acl = qw( !.example.com ); # $spam_lovers_re = new_RE( qr'^user@example\.com$'i ); # don't run spam check for these RECIPIENT domains: # @bypass_spam_checks_acl = qw( d1.com .d2.com a.d3.com ); # or the other way around (bypass check for all BUT these): # @bypass_spam_checks_acl = qw( !d1.com !.d2.com !a.d3.com . ); # a practical application: don't check outgoing mail for spam: # @bypass_spam_checks_acl = ( "!.$mydomain", "." ); # (a downside of which is that such mail will not count as ham in SA bayes db) # Where to find SQL server(s) and database to support SQL lookups? # A list of triples: (dsn,user,passw). (dsn = data source name) # More than one entry may be specified for multiple (backup) SQL servers. # See 'man DBI', 'man DBD::mysql', 'man DBD::Pg', ... for details. # When chroot-ed, accessing SQL server over inet socket may be more convenient. # # @lookup_sql_dsn = # ( ['DBI:mysql:database=mail;host=127.0.0.1;port=3306', 'user1', 'passwd1'], # ['DBI:mysql:database=mail;host=host2', 'username2', 'password2'] ); # # ('mail' in the example is the database name, choose what you like) # With PostgreSQL the dsn (first element of the triple) may look like: # 'DBI:Pg:host=host1;dbname=mail' # The SQL select clause to fetch per-recipient policy settings. # The %k will be replaced by a comma-separated list of query addresses # (e.g. full address, domain only, catchall). Use ORDER, if there # is a chance that multiple records will match - the first match wins. # If field names are not unique (e.g. 'id'), the later field overwrites the # earlier in a hash returned by lookup, which is why we use '*,users.id'. # $sql_select_policy = 'SELECT *,users.id FROM users,policy'. # ' WHERE (users.policy_id=policy.id) AND (users.email IN (%k))'. # ' ORDER BY users.priority DESC'; # # The SQL select clause to check sender in per-recipient whitelist/blacklist # The first SELECT argument '?' will be users.id from recipient SQL lookup, # the %k will be sender addresses (e.g. full address, domain only, catchall). # $sql_select_white_black_list = 'SELECT wb FROM wblist,mailaddr'. # ' WHERE (wblist.rid=?) AND (wblist.sid=mailaddr.id)'. # ' AND (mailaddr.email IN (%k))'. # ' ORDER BY mailaddr.priority DESC'; $sql_select_white_black_list = undef; # undef disables SQL white/blacklisting # If you decide to pass viruses (or spam) to certain recipients using the # above lookup tables or using $final_virus_destiny=D_PASS, you can set # the variable $addr_extension_virus ($addr_extension_spam) to some # string, and the recipient address will have this string appended # as an address extension to the local-part of the address. This extension # can be used by final local delivery agent to place such mail in different # folders. Leave these two variables undefined or empty strings to prevent # appending address extensions. Setting has no effect on recipient which will # not be receiving viruses/spam. Recipients who do not match lookup tables # local_domains* are not affected. # # LDAs usually default to stripping away address extension if no special # handling is specified, so having this option enabled normally does no harm, # provided the $recipients_delimiter matches the setting on the final # MTA's LDA. # $addr_extension_virus = 'virus'; # (default is undef, same as empty) # $addr_extension_spam = 'spam'; # (default is undef, same as empty) # $addr_extension_banned = 'banned'; # (default is undef, same as empty) # Delimiter between local part of the recipient address and address extension # (which can optionally be added, see variables $addr_extension_virus and # $addr_extension_spam). E.g. recipient address example.com> gets changed # to [email protected]>. # # Delimiter should match equivalent (final) MTA delimiter setting. # (e.g. for Postfix add 'recipient_delimiter = +' to main.cf) # Setting it to an empty string or to undef disables this feature # regardless of $addr_extension_virus and $addr_extension_spam settings. $recipient_delimiter = '+'; # (default is '+') # true: replace extension; false: append extension $replace_existing_extension = 1; # (default is false) # Affects matching of localpart of e-mail addresses (left of '@') # in lookups: true = case sensitive, false = case insensitive $localpart_is_case_sensitive = 0; # (default is false) # ENVELOPE SENDER WHITELISTING / BLACKLISTING - GLOBAL (RECIPIENT-INDEPENDENT) # (affects spam checking only, has no effect on virus and other checks) # WHITELISTING: use ENVELOPE SENDER lookups to ENSURE DELIVERY from whitelisted # senders even if the message would be recognized as spam. Effectively, for # the specified senders, message recipients temporarily become 'spam_lovers'. # To avoid surprises, whitelisted sender also suppresses inserting/editing # the tag2-level header fields (X-Spam-*, Subject), appending spam address # extension, and quarantining. # BLACKLISTING: messages from specified SENDERS are DECLARED SPAM. # Effectively, for messages from blacklisted senders, spam level # is artificially pushed high, and the normal spam processing applies, # resulting in 'X-Spam-Flag: YES', high 'X-Spam-Level' bar and other usual # reactions to spam, including possible rejection. If the message nevertheless # still passes (e.g. for spam loving recipients), it is tagged as BLACKLISTED # in the 'X-Spam-Status' header field, but the reported spam value and # set of tests in this report header field (if available from SpamAssassin, # which may have not been called) is not adjusted. # # A sender may be both white- and blacklisted at the same time, settings # are independent. For example, being both white- and blacklisted, message # is delivered to recipients, but is not tagged as spam (X-Spam-Flag: No; # X-Spam-Status: No, ...), but the reported spam level (if computed) may # still indicate high spam score. # # If ALL recipients of the message either white- or blacklist the sender, # spam scanning (calling the SpamAssassin) is bypassed, saving on time. # # The following variables (lookup tables) are available, with the semantics # and syntax as specified in README.lookups: # # %whitelist_sender, @whitelist_sender_acl, $whitelist_sender_re # %blacklist_sender, @blacklist_sender_acl, $blacklist_sender_re # SOME EXAMPLES: # #ACL: # @whitelist_sender_acl = qw( .example.com ); # # @whitelist_sender_acl = ( ".$mydomain" ); # $mydomain and its subdomains # NOTE: This is not a reliable way of turning off spam checks for # locally-originating mail, as sender address can easily be faked. # To reliably avoid spam-scanning outgoing mail, # use @bypass_spam_checks_acl . #RE: # $whitelist_sender_re = new_RE( # qr'^postmaster@.*\bexample\.com$'i, # qr'owner-[^@]*@'i, qr'-request@'i, # qr'\.example\.com$'i ); # $blacklist_sender_re = new_RE( qr'^(bulkmail|offers|cheapbenefits|earnmoney|foryou|greatcasino)@'i, qr'^(investments|lose_weight_today|market\.alert|money2you|MyGreenCard)@'i, qr'^(new\.tld\.registry|opt-out|opt-in|optin|saveonl|smoking2002k)@'i, qr'^(specialoffer|specialoffers|stockalert|stopsnoring|wantsome)@'i, qr'^(workathome|yesitsfree|your_friend|greatoffers)@'i, qr'^(inkjetplanet|marketopt|MakeMoney)\d*@'i, ); #HASH lookup variant: # NOTE: Perl operator qw splits its argument string by whitespace # and produces a list. This means that addresses can not contain # whitespace, and there is no provision for comments within the string. # You can use the normal Perl list syntax if you have special requirements, # e.g. map {...} ('one user@bla', '.second.com'), or use read_hash to read # addresses from a file. # # a hash lookup table can be read from a file, # one address per line, comments and empty lines are permitted: # # read_hash(\%whitelist_sender, '/var/amavis/whitelist_sender'); # ... or set directly: map { $whitelist_sender{lc($_)}=1 } (qw( [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] )); # ENVELOPE SENDER WHITELISTING / BLACKLISTING - PER-RECIPIENT # The same semantics as for global white/blacklisting applies, but this # time each recipient (or its domain, or subdomain, ...) can be given # an individual lookup table for matching senders. The per-recipient lookups # override the global lookups, which serve as a fallback default. # Specify a two-level lookup table: the key for the outer table is recipient, # and the result should be an inner lookup table (hash or ACL or RE), # where the key used will be the sender. # #$per_recip_blacklist_sender_lookup_tables = { # '[email protected]'=>new_RE(qr'^(inkjetplanet|marketopt|MakeMoney)\d*@'i), # '[email protected]'=>[qw( [email protected],org .d2.example,org )], #}; #$per_recip_whitelist_sender_lookup_tables = { # '[email protected]' => [qw( [email protected] .other.example.org )], # '.my1.example.com' => [qw( !foe.other.example,org .other.example,org )], # '.my2.example.com' => read_hash('/var/amavis/my2-wl.dat'), # 'abuse@' => { 'postmaster@'=>1, # '[email protected]'=>1, '[email protected]'=>1 }, #}; # # Section VI - Resource limits # # Sanity limit to the number of allowed recipients per SMTP transaction # $smtpd_recipient_limit = 1000; # (default is 1000) # Resource limits to protect unpackers, decompressors and virus scanners # against mail bombs (e.g. 42.zip) # Maximum recursion level for extraction/decoding (0 or undef disables limit) $MAXLEVELS = 14; # (default is undef, no limit) # Maximum number of extracted files (0 or undef disables the limit) $MAXFILES = 1500; # (default is undef, no limit) # For the cumulative total of all decoded mail parts we set max storage size # to defend against mail bombs. Even though parts may be deleted (replaced # by decoded text) during decoding, the size they occupied is _not_ returned # to the quota pool. # # Parameters to storage quota formula for unpacking/decoding/decompressing # Formula: # quota = max($MIN_EXPANSION_QUOTA, # $mail_size*$MIN_EXPANSION_FACTOR, # min($MAX_EXPANSION_QUOTA, $mail_size*$MAX_EXPANSION_FACTOR)) # In plain words (later condition overrules previous ones): # allow MAX_EXPANSION_FACTOR times initial mail size, # but not more than MAX_EXPANSION_QUOTA, # but not less than MIN_EXPANSION_FACTOR times initial mail size, # but never less than MIN_EXPANSION_QUOTA # $MIN_EXPANSION_QUOTA = 100*1024; # bytes (default undef, not enforced) $MAX_EXPANSION_QUOTA = 300*1024*1024; # bytes (default undef, not enforced) $MIN_EXPANSION_FACTOR = 5; # times original mail size (must be specified) $MAX_EXPANSION_FACTOR = 500; # times original mail size (must be specified) # # Section VII - External programs, virus scanners # # Specify a path string, which is a colon-separated string of directories # (no trailing slashes!) to be assigned to the environment variable PATH # and to serve for locating external programs below. # NOTE: if $daemon_chroot_dir is nonempty, the directories will be # relative to the chroot directory specified; $path = '/usr/local/sbin:/usr/local/bin:/usr/sbin:/sbin:/usr/bin:/bin'; # Specify one string or a search list of strings (first match wins). # The string (or: each string in a list) may be an absolute path, # or just a program name, to be located via $path; # Empty string or undef (=default) disables the use of that external program. # Optionally command arguments may be specified - only the first substring # up to the whitespace is used for file searching. $file = 'file'; # file(1) utility; use 3.41 or later to avoid vulnerability $gzip = 'gzip'; $bzip2 = 'bzip2'; $lzop = 'lzop'; $uncompress = ['uncompress', 'gzip -d', 'zcat']; $unfreeze = ['unfreeze', 'freeze -d', 'melt', 'fcat']; $arc = ['nomarch', 'arc']; $unarj = ['arj', 'unarj']; # both can extract, arj is recommended $unrar = ['rar', 'unrar']; # both can extract, same options $zoo = 'zoo'; $lha = 'lha'; $cpio = 'cpio'; # comment out if cpio does not support GNU options # SpamAssassin settings # $sa_local_tests_only is passed to Mail::SpamAssassin::new as a value # of the option local_tests_only. See Mail::SpamAssassin man page. # If set to 1, SA tests are restricted to local tests only, i.e. no tests # that require internet access will be performed. # $sa_local_tests_only = 1; # (default: false) #$sa_auto_whitelist = 1; # turn on AWL (default: false) # Timout for SpamAssassin. This is only used if spamassassin does NOT # override it (which it often does if sa_local_tests_only is not true) $sa_timeout = 30; # timeout in seconds for a call to SpamAssassin # (default is 30 seconds, undef disables it) # AWL (auto whitelisting), requires spamassassin 2.44 or better # $sa_auto_whitelist = 1; # defaults to undef $sa_mail_body_size_limit = 150*1024; # don't waste time on SA is mail is larger # (less than 1% of spam is > 64k) # default: undef, no limitations # default values, can be overridden by more specific lookups, e.g. SQL $sa_tag_level_deflt = 4.0; # add spam info headers if at, or above that level $sa_tag2_level_deflt = 6.3; # add 'spam detected' headers at that level $sa_kill_level_deflt = $sa_tag2_level_deflt; # triggers spam evasive actions # at or above that level: bounce/reject/drop, # quarantine, and adding mail address extension $sa_dsn_cutoff_level = 10; # spam level beyond which a DSN is not sent, # effectively turning D_BOUNCE into D_DISCARD; # undef disables this feature and is a default; # # The $sa_tag_level_deflt, $sa_tag2_level_deflt and $sa_kill_level_deflt # may also be hashrefs to hash lookup tables, to make static per-recipient # settings possible without having to resort to SQL or LDAP lookups. # a quick reference: # tag_level controls adding the X-Spam-Status and X-Spam-Level headers, # tag2_level controls adding 'X-Spam-Flag: YES', and editing Subject, # kill_level controls 'evasive actions' (reject, quarantine, extensions); # it only makes sense to maintain the relationship: # tag_level <= tag2_level <= kill_level < $sa_dsn_cutoff_level # string to prepend to Subject header field when message exceeds tag2 level $sa_spam_subject_tag = '***SPAM*** '; # (defaults to undef, disabled) # (only seen when spam is not to be rejected # and recipient is in local_domains*) #$sa_spam_modifies_subj = 1; # may be a ref to a lookup table, default is true # Example: modify Subject for all local recipients except [email protected] #$sa_spam_modifies_subj = [qw( [email protected] . )]; # stop anti-virus scanning when the first scanner detects a virus? $first_infected_stops_scan = 1; # default is false, all scanners are called # @av_scanners is a list of n-tuples, where fields semantics is: # 1. av scanner plain name, to be used in log and reports; # 2. scanner program name; this string will be submitted to subroutine # find_external_programs(), which will try to find the full program # path name; if program is not found, this scanner is disabled. # Besides a simple string (full program path name or just the basename # to be looked for in PATH), this may be an array ref of alternative # program names or full paths - the first match in the list will be used; # As a special case for more complex scanners, this field may be # a subroutine reference, and the whole n-tuple is passed to it as args. # 3. command arguments to be given to the scanner program; # a substring {} will be replaced by the directory name to be scanned, # i.e. "$tempdir/parts", a "*" will be replaced by file names of parts; # 4. an array ref of av scanner exit status values, or a regexp (to be # matched against scanner output), indicating NO VIRUSES found; # 5. an array ref of av scanner exit status values, or a regexp (to be # matched against scanner output), indicating VIRUSES WERE FOUND; # Note: the virus match prevails over a 'not found' match, so it is safe # even if the no. 4. matches for viruses too; # 6. a regexp (to be matched against scanner output), returning a list # of virus names found. # 7. and 8.: (optional) subroutines to be executed before and after scanner # (e.g. to set environment or current directory); # see examples for these at KasperskyLab AVP and Sophos sweep. # NOTES: # # - NOT DEFINING @av_scanners (e.g. setting it to empty list, or deleting the # whole assignment) TURNS OFF LOADING AND COMPILING OF THE ANTIVIRUS CODE # (which can be handy if all you want to do is spam scanning); # # - the order matters: although _all_ available entries from the list are # always tried regardless of their verdict, scanners are run in the order # specified: the report from the first one detecting a virus will be used # (providing virus names and scanner output); REARRANGE THE ORDER TO WILL; # # - it doesn't hurt to keep an unused command line scanner entry in the list # if the program can not be found; the path search is only performed once # during the program startup; # # COROLLARY: to disable a scanner that _does_ exist on your system, # comment out its entry or use undef or '' as its program name/path # (second parameter). An example where this is almost a must: disable # Sophos 'sweep' if you have its daemonized version Sophie or SAVI-Perl # (same for Trophie/vscan, and clamd/clamscan), or if another unrelated # program happens to have a name matching one of the entries ('sweep' # again comes to mind); # # - it DOES HURT to keep unwanted entries which use INTERNAL SUBROUTINES # for interfacing (where the second parameter starts with \&). # Keeping such entry and not having a corresponding virus scanner daemon # causes an unnecessary connection attempt (which eventually times out, # but it wastes precious time). For this reason the daemonized entries # are commented in the distribution - just remove the '#' where needed. # # CERT list of av resources: http://www.cert.org/other_sources/viruses.html @av_scanners = ( # ### http://www.vanja.com/tools/sophie/ # ['Sophie', # \_daemon, ["{}/\n", '/var/run/sophie'], # qr/(?x)^ 0+ ( : | [\000\r\n]* $)/, qr/(?x)^ 1 ( : | [\000\r\n]* $)/, # qr/(?x)^ [-+]? \d+ : (.*?) [\000\r\n]* $/ ], # ### http://www.csupomona.edu/~henson/www/projects/SAVI-Perl/ # ['Sophos SAVI', \_savi ], ### http://www.clamav.net/ ['Clam Antivirus-clamd', \_daemon, ["CONTSCAN {}\n", "/var/run/clamav/clamd.ctl"], qr/\bOK$/, qr/\bFOUND$/, qr/^.*?: (?!Infected Archive)(.*) FOUND$/ ], # NOTE: run clamd under the same user as amavisd; match the socket # name (LocalSocket) in clamav.conf to the socket name in this entry # When running chrooted one may prefer: ["CONTSCAN {}\n","$MYHOME/clamd"], # ### http://www.openantivirus.org/ # ['OpenAntiVirus ScannerDaemon (OAV)', # \_daemon, ["SCAN {}\n", '127.0.0.1:8127'], # qr/^OK/, qr/^FOUND: /, qr/^FOUND: (.+)/ ], # ### http://www.vanja.com/tools/trophie/ # ['Trophie', # \_daemon, ["{}/\n", '/var/run/trophie'], # qr/(?x)^ 0+ ( : | [\000\r\n]* $)/, qr/(?x)^ 1 ( : | [\000\r\n]* $)/, # qr/(?x)^ [-+]? \d+ : (.*?) [\000\r\n]* $/ ], # ### http://www.grisoft.com/ # ['AVG Anti-Virus', # \_daemon, ["SCAN {}\n", '127.0.0.1:55555'], # qr/^200/, qr/^403/, qr/^403 .*?: (.+)/ ], # ### http://www.f-prot.com/ # ['FRISK F-Prot Daemon', # \_daemon, # ["GET {}/*?-dumb%20-archive%20-packed HTTP/1.0\r\n\r\n", # ['127.0.0.1:10200','127.0.0.1:10201','127.0.0.1:10202', # '127.0.0.1:10203','127.0.0.1:10204'] ], # qr/(?i)^>]*>clean<\/summary>/, # qr/(?i)^>]*>infected<\/summary>/, # qr/(?i)(.+)<\/name>/ ], ['KasperskyLab AVP - aveclient', ['/usr/local/kav/bin/aveclient','/usr/local/share/kav/bin/aveclient', '/opt/kav/bin/aveclient','aveclient'], '-p /var/run/aveserver -s {}/*', [0,3,6,8], qr/\b(INFECTED|SUSPICION)\b/, qr/(?:INFECTED|SUSPICION) (.+)/, ], ['KasperskyLab AntiViral Toolkit Pro (AVP)', ['avp'], '-* -P -B -Y -O- {}', [0,8,16,24], [2,3,4,5,6, 18,19,20,21,22], qr/infected: (.+)/, sub {chdir('/opt/AVP') or die "Can't chdir to AVP: $!"}, sub {chdir($TEMPBASE) or die "Can't chdir back to $TEMPBASE $!"}, ], ### The kavdaemon and AVPDaemonClient have been removed from Kasperky ### products and replaced by aveserver and aveclient ['KasperskyLab AVPDaemonClient', [ '/opt/AVP/kavdaemon', 'kavdaemon', '/opt/AVP/AvpDaemonClient', 'AvpDaemonClient', '/opt/AVP/AvpTeamDream', 'AvpTeamDream', '/opt/AVP/avpdc', 'avpdc' ], "-f=$TEMPBASE {}", [0,8,16,24], [2,3,4,5,6, 18,19,20,21,22], qr/infected: ([^\r\n]+)/ ], # change the startup-script in /etc/init.d/kavd to: # DPARMS="-* -Y -dl -f=/var/amavis /var/amavis" # (or perhaps: DPARMS="-I0 -Y -* /var/amavis" ) # adjusting /var/amavis above to match your $TEMPBASE. # The '-f=/var/amavis' is needed if not running it as root, so it # can find, read, and write its pid file, etc., see 'man kavdaemon'. # defUnix.prf: there must be an entry "*/var/amavis" (or whatever # directory $TEMPBASE specifies) in the 'Names=' section. # cd /opt/AVP/DaemonClients; configure; cd Sample; make # cp AvpDaemonClient /opt/AVP/ # su - vscan -c "${PREFIX}/kavdaemon ${DPARMS}" ### http://www.hbedv.com/ or http://www.centralcommand.com/ ['H+BEDV AntiVir or CentralCommand Vexira Antivirus', ['antivir','vexira'], '--allfiles -noboot -nombr -rs -s -z {}', [0], qr/ALERT:|VIRUS:/, qr/(?x)^\s* (?: ALERT: \s* (?: \[ | [^']* ' ) | (?i) VIRUS:\ .*?\ virus\ '?) ( [^\]\s']+ )/ ], # NOTE: if you only have a demo version, remove -z and add 214, as in: # '--allfiles -noboot -nombr -rs -s {}', [0,214], qr/ALERT:|VIRUS:/, ### http://www.commandsoftware.com/ ['Command AntiVirus for Linux', 'csav', '-all -archive -packed {}', [50], [51,52,53], qr/Infection: (.+)/ ], ### http://www.symantec.com/ ['Symantec CarrierScan via Symantec CommandLineScanner', 'cscmdline', '-a scan -i 1 -v -s 127.0.0.1:7777 {}', qr/^Files Infected:\s+0$/, qr/^Infected\b/, qr/^(?:Info|Virus Name):\s+(.+)/ ], ### http://www.symantec.com/ ['Symantec AntiVirus Scan Engine', 'savsecls', '-server 127.0.0.1:7777 -mode scanrepair -details -verbose {}', [0], qr/^Infected\b/, qr/^(?:Info|Virus Name):\s+(.+)/ ], # NOTE: check options and patterns to see which entry better applies ### http://www.sald.com/, http://drweb.imshop.de/ ['drweb - DrWeb Antivirus', ['/usr/local/drweb/drweb', '/opt/drweb/drweb', 'drweb'], '-path={} -al -go -ot -cn -upn -ok-', [0,32], [1,33], qr' infected (?:with|by)(?: virus)? (.*)$'], # ### http://www.sald.com/, http://www.dials.ru/english/, http://www.drweb.ru/ # ['DrWebD', \_daemon, # DrWebD 4.31 or later # [pack('N',1). # DRWEBD_SCAN_CMD # pack('N',0x00280001). # DONT_CHANGEMAIL, IS_MAIL, RETURN_VIRUSES # pack('N', # path length # length("$TEMPBASE/amavis-yyyymmddTHHMMSS-xxxxx/parts/part-xxxxx")). # '{}/*'. # path # pack('N',0). # content size # pack('N',0), # '/var/drweb/run/drwebd.sock', # # '/var/amavis/var/run/drwebd.sock', # suitable for chroot # # '/usr/local/drweb/run/drwebd.sock', # FreeBSD drweb ports default # # '127.0.0.1:3000', # or over an inet socket # ], # qr/\A\x00(\x10|\x11)\x00\x00/s, # IS_CLEAN, EVAL_KEY # qr/\A\x00(\x00|\x01)\x00(\x20|\x40|\x80)/s, # KNOWN_V, UNKNOWN_V, V._MODIF # qr/\A.{12}(?:infected with )?([^\x00]+)\x00/s, # ], # # NOTE: If you are using amavis-milter, change length to: # # length("$TEMPBASE/amavis-milter-xxxxxxxxxxxxxx/parts/part-xxxxx"). ### http://www.f-secure.com/products/anti-virus/ ['F-Secure Antivirus', 'fsav', '--dumb --mime --archive {}', [0], [3,8], qr/(?:infection|Infected|Suspected): (.+)/ ], ['CAI InoculateIT', 'inocucmd', '-sec -nex {}', [0], [100], qr/was infected by virus (.+)/ ], ['MkS_Vir for Linux (beta)', ['mks32','mks'], '-s {}/*', [0], [1,2], # any use for options: -a -c ? qr/--[ \t]*(.+)/ ], ### http://www.nod32.com/ ['ESET Software NOD32', 'nod32', '-all -subdir+ {}', [0], [1,2], qr/^.+? - (.+?)\s*(?:backdoor|joke|trojan|virus|worm)/ ], ### http://www.nod32.com/ ['ESET Software NOD32 - Client/Server Version', 'nod32cli', '-a -r -d recurse --heur standard {}', [0], [10,11], qr/^\S+\s+infected:\s+(.+)/ ], ### http://www.norman.com/products_nvc.shtml ['Norman Virus Control v5 / Linux', 'nvcc', '-c -l:0 -s -u {}', [0], [1], qr/(?i).* virus in .* -> \'(.+)\'/ ], ### http://www.pandasoftware.com/ ['Panda Antivirus for Linux', ['pavcl'], '-aut -aex -heu -cmp -nbr -nor -nso -eng {}', qr/Number of files infected[ .]*: 0(?!\d)/, qr/Number of files infected[ .]*: 0*[1-9]/, qr/Found virus :\s*(\S+)/ ], # GeCAD AV technology is acquired by Microsoft; RAV has been discontinued. # Check your RAV license terms before fiddling with the following two lines! # ['GeCAD RAV AntiVirus 8', 'ravav', # '--all --archive --mail {}', [1], [2,3,4,5], qr/Infected: (.+)/ ], # # NOTE: the command line switches changed with scan engine 8.5 ! # # (btw, assigning stdin to /dev/null causes RAV to fail) ### http://www.nai.com/ ['NAI McAfee AntiVirus (uvscan)', 'uvscan', '--secure -rv --mime --summary --noboot - {}', [0], [13], qr/(?x) Found (?: \ the\ (.+)\ (?:virus|trojan) | \ (?:virus|trojan)\ or\ variant\ ([^ ]+) | :\ (.+)\ NOT\ a\ virus)/, # sub {$ENV{LD_PRELOAD}='/lib/libc.so.6'}, # sub {delete $ENV{LD_PRELOAD}}, ], # NOTE1: with RH9: force the dynamic linker to look at /lib/libc.so.6 before # anything else by setting environment variable LD_PRELOAD=/lib/libc.so.6 # and then clear it when finished to avoid confusing anything else. # NOTE2: to treat encrypted files as viruses replace the [13] with: # qr/^\s{5,}(Found|is password-protected|.*(virus|trojan))/ ### http://www.virusbuster.hu/en/ ['VirusBuster', ['vbuster', 'vbengcl'], # VirusBuster Ltd. does not support the daemon version for the workstation # engine (vbuster-eng-1.12-linux-i386-libc6.tgz) any longer. The names of # binaries, some parameters AND return codes (from 3 to 1) changed. "{} -ss -i '*' -log=$MYHOME/vbuster.log", [0], [1], qr/: '(.*)' - Virus/ ], # ### http://www.virusbuster.hu/en/ # ['VirusBuster (Client + Daemon)', 'vbengd', # # HINT: for an infected file it returns always 3, # # although the man-page tells a different story # '-f -log scandir {}', [0], [3], # qr/Virus found = (.*);/ ], ### http://www.cyber.com/ ['CyberSoft VFind', 'vfind', '--vexit {}/*', [0], [23], qr/##==>>>> VIRUS ID: CVDL (.+)/, # sub {$ENV{VSTK_HOME}='/usr/lib/vstk'}, ], ### http://www.ikarus-software.com/ ['Ikarus AntiVirus for Linux', 'ikarus', '{}', [0], [40], qr/Signature (.+) found/ ], ### http://www.bitdefender.com/ ['BitDefender', 'bdc', '--all --arc --mail {}', qr/^Infected files *:0(?!\d)/, qr/^(?:Infected files|Identified viruses|Suspect files) *:0*[1-9]/, qr/(?:suspected|infected): (.*)(?:\033|$)/ ], ); # If no virus scanners from the @av_scanners list produce 'clean' nor # 'infected' status (e.g. they all fail to run or the list is empty), # then _all_ scanners from the @av_scanners_backup list are tried. # When there are both daemonized and command-line scanners available, # it is customary to place slower command-line scanners in the # @av_scanners_backup list. The default choice is somewhat arbitrary, # move entries from one list to another as desired. @av_scanners_backup = ( ### http://www.clamav.net/ ['Clam Antivirus - clamscan', 'clamscan', "--stdout --no-summary -r --tempdir=$TEMPBASE {}", [0], [1], qr/^.*?: (?!Infected Archive)(.*) FOUND$/ ], ### http://www.f-prot.com/ ['FRISK F-Prot Antivirus', ['f-prot','f-prot.sh'], '-dumb -archive -packed {}', [0,8], [3,6], qr/Infection: (.+)/ ], ### http://www.trendmicro.com/ ['Trend Micro FileScanner', ['/etc/iscan/vscan','vscan'], '-za -a {}', [0], qr/Found virus/, qr/Found virus (.+) in/ ], ['KasperskyLab kavscanner', ['/opt/kav/bin/kavscanner','kavscanner'], '-i1 -xp {}', [0,10,15], [5,20,21,25], qr/(?:CURED|INFECTED|CUREFAILED|WARNING|SUSPICION) (.*)/ , sub {chdir('/opt/kav/bin') or die "Can't chdir to kav: $!"}, sub {chdir($TEMPBASE) or die "Can't chdir back to $TEMPBASE $!"}, ], # Commented out because the name 'sweep' clashes with the Debian package of # the same name. Make sure the correct sweep is found in the path when enabling # # ### http://www.sophos.com/ # ['Sophos Anti Virus (sweep)', 'sweep', # '-nb -f -all -rec -ss -sc -archive -cab -tnef --no-reset-atime {}', # [0,2], qr/Virus .*? found/, # qr/^>>> Virus(?: fragment)? '?(.*?)'? found/, # ], # # other options to consider: -mime -oe -idedir=/usr/local/sav # always succeeds (uncomment to consider mail clean if all other scanners fail) # ['always-clean', sub {0}], ); # # Section VIII - Debugging # # The most useful debugging tool is to run amavisd-new non-detached # from a terminal window: # amavisd debug # Some more refined approaches: # If sender matches ACL, turn log level fully up, just for this one message, # and preserve temporary directory #@debug_sender_acl = ( "test-sender\@$mydomain" ); #@debug_sender_acl = qw( [email protected] ); # May be useful along with @debug_sender_acl: # Prevent all decoded originals being deleted (replaced by decoded part) #$keep_decoded_original_re = new_RE( qr/.*/ ); # Turn on SpamAssassin debugging (output to STDERR, use with 'amavisd debug') #$sa_debug = 1; # defaults to false #------------- 1; # insure a defined return

4. clamav

   根据需要修改clamav.conf，freshclam.conf文件

   debian:~# cd /etc/clamav/ debian:/etc/clamav# ls clamav.conf freshclam.conf

5. spamassassin

   debian:~# cd /etc/spamassassin debian:/etc/spamassassin# vi /etc/default/spamassassin # /etc/default/spamd.conf # Duncan Findlay # WARNING read README.spamd before using. THERE ARE SECURITY RISKS! # Change to one to enable spamd #ENABLED=0 ENABLED=1 #值改为大于"0"的数字 # Options # See man spamd for possible options. The -d option is automatically added. OPTIONS="-c -m 10 -a -H" # Set nice level of spamd #NICE="--nicelevel 15" debian:/etc/spamassassin# /etc/init.d/spamassassin start Starting SpamAssassin spamd. debian:/etc/spamassassin# ps ax|grep spamd 15487 ? Ss 0:01 /usr/sbin/spamd -c -m 10 -a -H -d --pidfile=/var/run/spamd.pid debian:/etc/spamassassin#

6. reload

   debian:~# /etc/init.d/postfix reload debian:~# /etc/init.d/amavis reload