From 1c357b55931a0d4fbd15d51d61ec4e81d4f38aa5 Mon Sep 17 00:00:00 2001
From: Guilhem Moulin <guilhem@fripost.org>
Date: Thu, 3 Jul 2014 04:26:26 +0200
Subject: Install amavisd-new on the outgoing SMTP proxy.
For DKIM signing and virus checking.
---
.../amavis/templates/etc/amavis/conf.d/50-user.j2 | 182 +++++++++++++++++++++
1 file changed, 182 insertions(+)
create mode 100644 roles/amavis/templates/etc/amavis/conf.d/50-user.j2
(limited to 'roles/amavis/templates')
diff --git a/roles/amavis/templates/etc/amavis/conf.d/50-user.j2 b/roles/amavis/templates/etc/amavis/conf.d/50-user.j2
new file mode 100644
index 0000000..adafd7f
--- /dev/null
+++ b/roles/amavis/templates/etc/amavis/conf.d/50-user.j2
@@ -0,0 +1,182 @@
+use strict;
+
+#
+# Place your configuration directives here. They will override those in
+# earlier files.
+#
+# See /usr/share/doc/amavisd-new/ for documentation and examples of
+# the directives you can use in this file
+#
+
+# $max_servers: num of pre-forked children (2..30 is common). It *must*
+# match the number set in /etc/postfix/master.cf "maxproc" column for
+# the amavisfeed service.
+$max_servers = 5;
+$recipient_delimiter = '+';
+
+$mydomain = 'fripost.org';
+$X_HEADER_LINE = "Debian $myproduct_name at $mydomain";
+undef $undecipherable_subject_tag;
+
+@mynetworks_maps = ();
+@remove_existing_spam_headers_maps = ();
+@bypass_virus_checks_maps = (); # load virus checking code
+
+
+$enable_dkim_verification = 1; # load DKIM signing/verifying code
+{% if 'out' not in group_names %}
+undef $enable_dkim_signing;
+@bypass_spam_checks_maps = (); # load spam checking code
+{% else %}
+$enable_dkim_signing = 1;
+# Sign *all* outgoing mails with *our* key (yes, amavis complains, but this is
+# safe as we force our domain with the 'd' tag).
+dkim_key(qr'^', 'outgoing', '/var/lib/dkim/outgoing.'.$mydomain.'.key');
+@dkim_signature_options_bysender_maps = (
+ { '.' => { d => $mydomain
+ , a => 'rsa-sha256'
+ , ttl => 21*24*3600
+ , c => 'relaxed/simple' } } );
+# Conform to RFC 4871 and don't sign Received: headers.
+$signed_header_fields{received} = 0;
+{% endif %}
+
+
+
+# Defang viruses only
+%defang_maps_by_ccat = ( CC_VIRUS, 1
+ , CC_CATCHALL, undef
+ );
+
+# Never BCC / DSN; don't forget to disallow setting amavisSpamDsnCutoffLevel
+# and amavis*Admin, also
+%always_bcc_by_ccat = ( CC_CATCHALL, undef );
+%dsn_bcc_by_ccat = ( CC_CATCHALL, undef );
+
+# Never warn sender or recipient; don't forget to disallow setting
+# amavisWarn*Recip, also
+%warnsender_by_ccat = ( CC_CATCHALL, undef );
+%warnrecip_maps_by_ccat = ( CC_CATCHALL, undef );
+
+
+# A couple of common banned rules one might can refer by their name
+%banned_rules = (
+ 'NO-MS-EXEC'=> new_RE( qr'^\.exe-ms$' ),
+ 'PASSALL' => new_RE( [qr'^' => 0] ),
+ 'ALLOW_EXE' => new_RE( qr'.\.(vbs|pif|scr|bat)$'i, [qr'^\.exe$' => 0] ),
+ 'ALLOW_VBS' => new_RE( [qr'.\.vbs$' => 0] ),
+);
+
+
+{% if 'MDA' in group_names %}
+$enable_ldap = 1; # Load Net::LDAP
+$default_ldap = {
+ hostname => 'ldapi://',
+ sasl => 1,
+ sasl_mech => 'EXTERNAL',
+ deref => 'never',
+ timeout => 5,
+ scope => 'one',
+ base => 'fvd=%d,ou=virtual,o=mailHosting,dc=fripost,dc=org',
+ # XXX: ideally we would use %u in the base and the query_filter, but
+ # it's not supported as of amavis 2.7 (see the 'lookup_ldap'
+ # subroutine in /usr/sbin/amavisd-new)
+ query_filter => '(&(objectClass=amavisAccount)(ObjectClass=FripostVirtualUser)(fvl=%m))'
+};
+{% endif %}
+
+
+# http://www.ijs.si/software/amavisd/amavisd-new-docs.html#pbanks-ex
+
+$protocol = 'LMTP';
+$inet_socket_port = [];
+
+{% if 'out' in group_names %}
+push @$inet_socket_port, 10040;
+$interface_policy{'10040'} = 'OUTGOING';
+{% endif %}
+{% if 'MDA' in group_names %}
+push @$inet_socket_port, 10041;
+$interface_policy{'10041'} = 'INCOMING';
+{% endif %}
+
+$QUARANTINEDIR = "$MYHOME/virusmails";
+$notify_method = 'smtp:[127.0.0.1]:16132'; # notifications
+$forward_method = 'smtp:[127.0.0.1]:10025'; # reinject
+$requeue_method = $notify_method; # requeue after quarantine
+
+# some defaults for spam checking
+$sa_tag_level_deflt = undef;
+$sa_tag2_level_deflt = 5;
+$sa_kill_level_deflt = 5;
+$sa_dsn_cutoff_level = undef;
+$sa_quarantine_cutoff_level = undef;
+
+
+# Here is an overall picture (sequence of events) of how pieces fit together
+#
+# bypass_virus_checks set for all recipients? ==> 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 $warn_offsite)
+# add address extensions for local recipients (when enabled)
+# send (non-)delivery notifications
+# to sender if DSN needed (BOUNCE or ($warnvirussender and D_PASS))
+# virus_lovers or final_destiny==D_PASS ==> PASS
+# DISCARD (2xx) or REJECT (5xx) (depending on final_*_destiny)
+
+
+# Mandatory DKIM signing and virus checking only
+$policy_bank{'OUTGOING'} = {
+ originating => 1,
+ enable_dkim_verification => 0,
+ smtpd_greeting_banner => '${helo-name} ${protocol} ${product} OUTGOING service ready',
+ forward_method => $forward_method,
+
+ # No black or white lists
+ message_size_limit_maps => [],
+ whitelist_sender_maps => [],
+ blacklist_sender_maps => [],
+
+ # Check for viruses (regardless of the recipient), but bypass all other checks
+ bypass_virus_checks_maps => undef,
+ bypass_banned_checks_maps => 1,
+ bypass_header_checks_maps => 1,
+ bypass_spam_checks_maps => 1,
+
+ # If found, notify postmaster, quarantine and discard
+ quarantine_to_maps_by_ccat => { CC_VIRUS, [$virus_quarantine_to], CC_CATCHALL, undef },
+ quarantine_method_by_ccat => { CC_VIRUS, [$virus_quarantine_method], CC_CATCHALL, undef },
+ admin_maps_by_ccat => { CC_VIRUS, ["postmaster\@$mydomain"], CC_CATCHALL, undef },
+ addr_extension_maps_by_ccat=> { CC_CATCHALL, undef },
+ lovers_maps_by_ccat => { CC_VIRUS, undef, CC_CATCHALL, 1 },
+ final_destiny_by_ccat => { CC_VIRUS, D_DISCARD, CC_CATCHALL, D_PASS },
+};
+
+$policy_bank{'INCOMING'} = {
+ originating => 0,
+ enable_dkim_verification => 1,
+ smtpd_greeting_banner => '${helo-name} ${protocol} ${product} INCOMING service ready',
+ forward_method => $forward_method,
+ message_size_limit_maps => [],
+
+ # Per-recipient Bayes Database
+ sa_username_maps => [ new_RE ( [ qr'^(.+@.+)$'i => '$1' ] )
+ , 'amavis' # catch-all
+ ],
+
+ # Never quarantine
+ # (Remember to disallow setting amavisSpamQuarantineCutoffLevel and
+ # amavisVirusQuarantine*To in the LDAP schema.)
+ quarantine_method_by_ccat => { CC_CATCHALL, undef },
+ admin_maps_by_ccat => { CC_CATCHALL, undef },
+
+ # Always deliver messages
+ final_destiny_by_ccat => { CC_CATCHALL, D_PASS },
+ lovers_maps_by_ccat => { CC_CATCHALL, 1 },
+};
+
+#------------ Do not modify anything below this line -------------
+1; # ensure a defined return
--
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