eximconf: reject mails with clearly faked Received: headers
[mirror/dsa-puppet.git] / modules / exim / templates / eximconf.erb
index 1441c9b..6398331 100644 (file)
@@ -107,7 +107,7 @@ allow_domain_literals = true
 # local_domains. It will be referenced
 # later on by the syntax "+local_domains".
 # Other domain and host lists may follow.
-# @ is the local FQDN, @[] matches the IP adress of any local interface.
+# @ is the local FQDN, @[] matches the IP address of any local interface.
 
 domainlist local_domains = @ : \
     @[] : \
@@ -810,7 +810,7 @@ check_recipient:
     log_message = greylisted.
     condition      = ${if or { \
                                  {eq{$acl_m_grey_recip}{1}} \
-                                 {bool_lax{HAS_DEFAULT_OPTIONS}} \
+                                 {bool_lax{$acl_m_defopt}} \
                              } \
                       }
     !senders       = :
@@ -851,7 +851,7 @@ check_recipient:
     domains        = +handled_domains
     condition      = ${if or { \
                                  {eq{$acl_m_grey_recip}{1}} \
-                                 {bool_lax{HAS_DEFAULT_OPTIONS}} \
+                                 {bool_lax{$acl_m_defopt}} \
                              } \
                       }
     set acl_m_pgr  = request=smtpd_access_policy\n\
@@ -881,7 +881,7 @@ check_recipient:
     domains        = +handled_domains
     condition      = ${if or { \
                                  {eq{$acl_m_grey_recip}{1}} \
-                                 {bool_lax{HAS_DEFAULT_OPTIONS}} \
+                                 {bool_lax{$acl_m_defopt}} \
                              } \
                       }
     condition      = ${if eq{${uc:${substr_0_7:$acl_m_pgr}}}{PREPEND}}
@@ -900,46 +900,46 @@ check_recipient:
           domains       = +virtual_domains : +bsmtp_domains
 
 <%- unless @use_smarthost -%>
-  deny    message  = host $sender_host_address is listed in $dnslist_domain ($dnslist_value); see $dnslist_text
+  deny    message  = host $sender_host_address is listed in $dnslist_domain ($dnslist_value)${if >{${strlen:${dnslist_text}}}{0}{; see $dnslist_text}}
+          domains  = +handled_domains
+          !hosts   = +debianhosts : WHITELIST
           dnslists = ${if match_domain{$domain}{+virtual_domains}\
                     {${if exists {${extract{directory}{VDOMAINDATA}{${value}/rbllist}}}\
                     {${lookup{$local_part}lsearch*{${extract{directory}{VDOMAINDATA}{${value}/rbllist}}}{$value}{}}}{}}}\
                     {${lookup{$local_part}lsearch{/etc/exim4/rbllist}{$value}{}}}} : \
                     ${lookup{$local_part}lsearch{/var/lib/misc/$primary_hostname/mail-rbl}{$value}{}}
-         domains       = +handled_domains
-         !hosts        = +debianhosts : WHITELIST
 
-  deny    message  = host $sender_host_address is listed in $dnslist_domain ($dnslist_value); see $dnslist_text
-          dnslists = noserver.dnsbl.sorbs.net
+  deny    message  = host $sender_host_address is listed in $dnslist_domain ($dnslist_value)${if >{${strlen:${dnslist_text}}}{0}{; see $dnslist_text}}
           domains  = +handled_domains
           !hosts   = +debianhosts : WHITELIST
+          dnslists = noserver.dnsbl.sorbs.net
 
-  deny    message   = host $sender_host_address is listed in $dnslist_domain ($dnslist_value); see $dnslist_text
-          condition = ${if bool_lax{HAS_DEFAULT_OPTIONS}}
-          dnslists  = relays.dnsbl.sorbs.net : xbl.spamhaus.org
+  deny    message   = host $sender_host_address is listed in $dnslist_domain ($dnslist_value)${if >{${strlen:${dnslist_text}}}{0}{; see $dnslist_text}}
+          condition = ${if bool_lax{$acl_m_defopt}}
           domains   = +handled_domains
           !hosts    = +debianhosts : WHITELIST
+          dnslists  = relays.dnsbl.sorbs.net : xbl.spamhaus.org
 
 <%- end -%>
-  deny    message  = domain $sender_address_domain is listed in $dnslist_domain ($dnslist_value); see $dnslist_text
+  deny    message  = domain $sender_address_domain is listed in $dnslist_domain ($dnslist_value)${if >{${strlen:${dnslist_text}}}{0}{; see $dnslist_text}}
+          domains  = +handled_domains
+          !hosts   = +debianhosts : WHITELIST
           dnslists = ${if match_domain{$domain}{+virtual_domains}\
                     {${if exists {${extract{directory}{VDOMAINDATA}{${value}/rhsbllist}}}\
                     {${expand:${lookup{$local_part}lsearch*{${extract{directory}{VDOMAINDATA}{${value}/rhsbllist}}}{$value}{}}}}{}}}\
                     {${expand:${lookup{$local_part}lsearch{/etc/exim4/rhsbllist}{$value}{}}}}} : \
                     ${expand:${lookup{$local_part}lsearch{/var/lib/misc/$primary_hostname/mail-rhsbl}{$value}{}}}
-         domains       = +handled_domains
-         !hosts        = +debianhosts : WHITELIST
 
-  deny    message  = domain $sender_address_domain is listed in $dnslist_domain ($dnslist_value); see $dnslist_text
-          dnslists = nomail.rhsbl.sorbs.net/$sender_address_domain
+  deny    message  = domain $sender_address_domain is listed in $dnslist_domain ($dnslist_value)${if >{${strlen:${dnslist_text}}}{0}{; see $dnslist_text}}
           domains  = +handled_domains
           !hosts   = +debianhosts : WHITELIST
+          dnslists = nomail.rhsbl.sorbs.net/$sender_address_domain
 
-  deny    message   = domain $sender_address_domain is listed in $dnslist_domain ($dnslist_value); see $dnslist_text
-          condition = ${if bool_lax{HAS_DEFAULT_OPTIONS}}
-          dnslists  = dbl.spamhaus.org/$sender_address_domain
+  deny    message   = domain $sender_address_domain is listed in $dnslist_domain ($dnslist_value)${if >{${strlen:${dnslist_text}}}{0}{; see $dnslist_text}}
+          condition = ${if bool_lax{$acl_m_defopt}}
           domains   = +handled_domains
           !hosts    = +debianhosts : WHITELIST
+          dnslists  = dbl.spamhaus.org/$sender_address_domain
 
 <%- unless @use_smarthost -%>
   deny    domains  = +handled_domains
@@ -1020,6 +1020,10 @@ check_message:
   # header.  Take their crack pipe away.
   drop   condition = ${if match{${lc:$h_From:}}{\Npostmaster@([^.]+\.)?debian\.org\N}}
 
+  # If the sending system says the mail is spam, believe them
+  deny    condition = ${if eqi {$h_X-Spam-Status:}{YES}}
+          message   = Incoming spam flags
+
 <%- if @is_rtmaster -%>
   deny    condition = ${if eq {$acl_m_prf}{RTMail}}
           condition = ${if and{{!match {${lc:$rh_Subject:}} {debian rt}} \
@@ -1056,7 +1060,7 @@ check_message:
 # postfix's strict_7bit_headers option, but only checks a few common problem
 # headers, as there doesn't appear to be an easy way to check them all.
   deny
-         condition       = ${if or {{match {$rh_Subject:}{[\200-\377]}}\
+         condition       = ${if or {{match {$rh_Subject:}{[\200-\377]}}\
                                 {match {$rh_To:}{[\200-\377]}}\
                                 {match {$rh_From:}{[\200-\377]}}\
                                 {match {$rh_Cc:}{[\200-\377]}}}}
@@ -1068,28 +1072,31 @@ check_message:
           condition       = ${if !eq {$acl_m_prf}{PopconMail}}
          message         = Your mailer is not RFC 2047 compliant: message rejected
 
-  discard condition      = ${if eq {$acl_m_prf}{blackhole}}
-          condition      = ${if bool_lax{$acl_m_defopt}}
+  deny    condition       = ${if match {$rh_Received:}{\N from [^ ]+\.example\.com \N}}
+          log_message     = Implausible Received header
+          message         = Header problem: message rejected
+
+  warn    condition      = ${if bool_lax{$acl_m_defopt}}
           condition      = ${if or {\
                                     {match {$message_body}{Wenn Sie zuk&uuml;nftig keine weiteren Informationen erhalten m&ouml;chten, <br />unwissentlich oder unbeabsichtigt in den Verteiler aufgenommen wurden,}} \
+                                    {match {$message_body}{\N(?i)Dear Beneficiary.*You have been selected.*Thousand United States Dollars\N}} \
+                                    {match {$message_body}{\N(?i)receiving sum of money into your account for safe keeping\N}} \
+                                    {match {$message_body}{\N(?i)I got your e-mail address through an internet marketing firm\N}} \
+                                    {match {$message_body}{\N(?i)De conformidad con lo establecido en la Ley 34/2002 Lssice le comunicamos que este escrito procede de Search Task\N}} \
                                    }\
                             }
+          set acl_m_content = 1
+
+  discard condition      = ${if eq {$acl_m_prf}{blackhole}}
+          condition      = ${if eq {$acl_m_content}{1}}
           log_message    = Discarded suspicious content for $recipients
 
   deny    condition      = ${if !eq {$acl_m_prf}{markup}}
-          condition      = ${if bool_lax{$acl_m_defopt}}
-          condition      = ${if or {\
-                                    {match {$message_body}{Wenn Sie zuk&uuml;nftig keine weiteren Informationen erhalten m&ouml;chten, <br />unwissentlich oder unbeabsichtigt in den Verteiler aufgenommen wurden,}} \
-                                   }\
-                            }
+          condition      = ${if eq {$acl_m_content}{1}}
           message        = Rejected due to suspicious content
 
   warn    condition      = ${if eq {$acl_m_prf}{markup}}
-          condition      = ${if bool_lax{$acl_m_defopt}}
-          condition      = ${if or {\
-                                    {match {$message_body}{Wenn Sie zuk&uuml;nftig keine weiteren Informationen erhalten m&ouml;chten, <br />unwissentlich oder unbeabsichtigt in den Verteiler aufgenommen wurden,}} \
-                                   }\
-                            }
+          condition      = ${if eq {$acl_m_content}{1}}
           add_header     = X-debian-content-warning: yes
 
 <%- if has_variable?("clamd") && @clamd -%>