Update docs for suggested Ident and PRDR settings

[users/jgh/exim.git] / doc / doc-txt / experimental-spec.txt

diff --git a/doc/doc-txt/experimental-spec.txt b/doc/doc-txt/experimental-spec.txt
index 92790ae33a158bfd05fc748c0aafc0b32f16bb55..018bfddb92496796f53be1ee56b3f598768c1ec7 100644 (file)
--- a/doc/doc-txt/experimental-spec.txt
+++ b/doc/doc-txt/experimental-spec.txt
@@ -6,34 +6,6 @@ about experimental  features, all  of which  are unstable and
 liable to incompatible change.
 
 
 liable to incompatible change.
 
 

-PRDR support
---------------------------------------------------------------
-
-Per-Recipient Data Reponse is an SMTP extension proposed by Eric Hall
-in a (now-expired) IETF draft from 2007.  It's not hit mainstream
-use, but has apparently been implemented in the META1 MTA.
-
-There is mention at http://mail.aegee.org/intern/sendmail.html
-of a patch to sendmail "to make it PRDR capable".
-
- ref: http://www.eric-a-hall.com/specs/draft-hall-prdr-00.txt
-
-If Exim is built with EXPERIMENTAL_PRDR there is a new config
-boolean "prdr_enable" which controls whether PRDR is advertised
-as part of an EHLO response, a new "acl_data_smtp_prdr" ACL
-(called for each recipient, after data arrives but before the
-data ACL), and a new smtp transport option "hosts_try_prdr".
-
-PRDR may be used to support per-user content filtering.  Without it
-one must defer any recipient after the first that has a different
-content-filter configuration.  With PRDR, the RCPT-time check
-for this can be disabled when the MAIL-time $smtp_command included
-"PRDR".  Any required difference in behaviour of the main DATA-time
-ACL should however depend on the PRDR-time ACL having run, as Exim
-will avoid doing so in some situations (eg.  single-recipient mails).
-
-
-

 OCSP Stapling support
 --------------------------------------------------------------
 
 OCSP Stapling support
 --------------------------------------------------------------
 


@@ -69,7 +41,8 @@ starts retrying to fetch an OCSP proof some time before its current
 proof expires.  The downside is that it requires server support.
 
 If Exim is built with EXPERIMENTAL_OCSP and it was built with OpenSSL,
 proof expires.  The downside is that it requires server support.
 
 If Exim is built with EXPERIMENTAL_OCSP and it was built with OpenSSL,

-then it gains a new global option: "tls_ocsp_file".
+or with GnuTLS 3.1.3 or later, then it gains a new global option:
+"tls_ocsp_file".

 
 The file specified therein is expected to be in DER format, and contain
 an OCSP proof.  Exim will serve it as part of the TLS handshake.  This
 
 The file specified therein is expected to be in DER format, and contain
 an OCSP proof.  Exim will serve it as part of the TLS handshake.  This


@@ -83,14 +56,21 @@ contents are always valid.  Exim will expand the "tls_ocsp_file" option
 on each connection, so a new file will be handled transparently on the
 next connection.
 
 on each connection, so a new file will be handled transparently on the
 next connection.
 

-Exim will check for a valid next update timestamp in the OCSP proof;
-if not present, or if the proof has expired, it will be ignored.
+Under OpenSSL Exim will check for a valid next update timestamp in the
+OCSP proof; if not present, or if the proof has expired, it will be
+ignored.
+
+Also, given EXPERIMENTAL_OCSP, the smtp transport gains two options:
+- "hosts_require_ocsp"; a host-list for which an OCSP Stapling
+is requested and required for the connection to proceed.  The default
+value is empty.
+- "hosts_request_ocsp"; a host-list for which (additionally) an OCSP
+Stapling is requested (but not necessarily verified).  The default
+value is "*" meaning that requests are made unless configured
+otherwise.

 
 

-Also, given EXPERIMENTAL_OCSP and OpenSSL, the smtp transport gains
-a "hosts_require_ocsp" option; a host-list for which an OCSP Stapling
-is requested and required for the connection to proceed.  The host(s)
-should also be in "hosts_require_tls", and "tls_verify_certificates"
-configured for the transport.
+The host(s) should also be in "hosts_require_tls", and
+"tls_verify_certificates" configured for the transport.

 
 For the client to be able to verify the stapled OCSP the server must
 also supply, in its stapled information, any intermediate
 
 For the client to be able to verify the stapled OCSP the server must
 also supply, in its stapled information, any intermediate


@@ -99,6 +79,9 @@ of the server certificate.  There may be zero or one such. These
 intermediate certificates should be added to the server OCSP stapling
 file (named by tls_ocsp_file).
 
 intermediate certificates should be added to the server OCSP stapling
 file (named by tls_ocsp_file).
 

+Note that the proof only covers the terminal server certificate,
+not any of the chain from CA to it.
+

 At this point in time, we're gathering feedback on use, to determine if
 it's worth adding complexity to the Exim daemon to periodically re-fetch
 OCSP files and somehow handling multiple files.
 At this point in time, we're gathering feedback on use, to determine if
 it's worth adding complexity to the Exim daemon to periodically re-fetch
 OCSP files and somehow handling multiple files.


@@ -107,8 +90,8 @@ OCSP files and somehow handling multiple files.
   OCSP server is supplied.  The server URL may be included in the
   server certificate, if the CA is helpful.
 
   OCSP server is supplied.  The server URL may be included in the
   server certificate, if the CA is helpful.
 

-  One fail mode seen was the OCSP Signer cert expiring before the end
-  of vailidity of the OCSP proof. The checking done by Exim/OpenSSL
+  One failure mode seen was the OCSP Signer cert expiring before the end
+  of validity of the OCSP proof. The checking done by Exim/OpenSSL

   noted this as invalid overall, but the re-fetch script did not.
 
 
   noted this as invalid overall, but the re-fetch script did not.
 
 


@@ -452,15 +435,21 @@ which the spf condition should succeed. Valid strings are:
               This means the queried domain has published
               a SPF record, but wants to allow outside
               servers to send mail under its domain as well.
               This means the queried domain has published
               a SPF record, but wants to allow outside
               servers to send mail under its domain as well.

-  o err_perm  This indicates a syntax error in the SPF
-              record of the queried domain. This should be
-              treated like "none".
-  o err_temp  This indicates a temporary error during all
+              This should be treated like "none".
+  o permerror This indicates a syntax error in the SPF
+              record of the queried domain. You may deny
+              messages when this occurs. (Changed in 4.83)
+  o temperror This indicates a temporary error during all

               processing, including Exim's SPF processing.
               You may defer messages when this occurs.
               processing, including Exim's SPF processing.
               You may defer messages when this occurs.

+              (Changed in 4.83)
+  o err_temp  Same as permerror, deprecated in 4.83, will be
+              removed in a future release.
+  o err_perm  Same as temperror, deprecated in 4.83, will be
+              removed in a future release.

 
 You can prefix each string with an exclamation mark to  invert
 
 You can prefix each string with an exclamation mark to  invert

-is meaning,  for example  "!fail" will  match all  results but
+its meaning,  for example  "!fail" will  match all  results but

 "fail".  The  string  list is  evaluated  left-to-right,  in a
 short-circuit fashion.  When a  string matches  the outcome of
 the SPF check, the condition  succeeds. If none of the  listed
 "fail".  The  string  list is  evaluated  left-to-right,  in a
 short-circuit fashion.  When a  string matches  the outcome of
 the SPF check, the condition  succeeds. If none of the  listed


@@ -510,8 +499,8 @@ variables.
 
   $spf_result
   This contains the outcome of the SPF check in string form,
 
   $spf_result
   This contains the outcome of the SPF check in string form,

-  one of pass, fail, softfail, none, neutral, err_perm or
-  err_temp.
+  one of pass, fail, softfail, none, neutral, permerror or
+  temperror.

 
   $spf_smtp_comment
   This contains a string that can be used in a SMTP response
 
   $spf_smtp_comment
   This contains a string that can be used in a SMTP response


@@ -773,7 +762,7 @@ fails.
 
 Of course, you can also use any other lookup method that Exim
 supports, including LDAP, Postgres, MySQL, etc, as long as the
 
 Of course, you can also use any other lookup method that Exim
 supports, including LDAP, Postgres, MySQL, etc, as long as the

-result is a list of colon-separated strings;
+result is a list of colon-separated strings.

 
 Several expansion variables are set before the DATA ACL is
 processed, and you can use them in this ACL.  The following
 
 Several expansion variables are set before the DATA ACL is
 processed, and you can use them in this ACL.  The following


@@ -781,7 +770,10 @@ expansion variables are available:
 
   o $dmarc_status
     This is a one word status indicating what the DMARC library
 
   o $dmarc_status
     This is a one word status indicating what the DMARC library

-    thinks of the email.
+    thinks of the email.  It is a combination of the results of
+    DMARC record lookup and the SPF/DKIM/DMARC processing results
+    (if a DMARC record was found).  The actual policy declared
+    in the DMARC record is in a separate expansion variable.

 
   o $dmarc_status_text
     This is a slightly longer, human readable status.
 
   o $dmarc_status_text
     This is a slightly longer, human readable status.


@@ -790,6 +782,11 @@ expansion variables are available:
     This is the domain which DMARC used to look up the DMARC
     policy record.
 
     This is the domain which DMARC used to look up the DMARC
     policy record.
 

+  o $dmarc_domain_policy
+    This is the policy declared in the DMARC record.  Valid values
+    are "none", "reject" and "quarantine".  It is blank when there
+    is any error, including no DMARC record.
+

   o $dmarc_ar_header
     This is the entire Authentication-Results header which you can
     add using an add_header modifier.
   o $dmarc_ar_header
     This is the entire Authentication-Results header which you can
     add using an add_header modifier.


@@ -825,6 +822,9 @@ b. Configure, somewhere before the DATA ACL, the control option to
   warn    !domains       = +screwed_up_dmarc_records
           control        = dmarc_enable_forensic
 
   warn    !domains       = +screwed_up_dmarc_records
           control        = dmarc_enable_forensic
 

+  warn    condition      = (lookup if destined to mailing list)
+          set acl_m_mailing_list = 1
+

 (DATA ACL)
   warn    dmarc_status   = accept : none : off
           !authenticated = *
 (DATA ACL)
   warn    dmarc_status   = accept : none : off
           !authenticated = *


@@ -840,6 +840,10 @@ b. Configure, somewhere before the DATA ACL, the control option to
           set $acl_m_quarantine = 1
           # Do something in a transport with this flag variable
 
           set $acl_m_quarantine = 1
           # Do something in a transport with this flag variable
 

+  deny    condition      = ${if eq{$dmarc_domain_policy}{reject}}
+          condition      = ${if eq{$acl_m_mailing_list}{1}}
+          message        = Messages from $dmarc_used_domain break mailing lists
+

   deny    dmarc_status   = reject
           !authenticated = *
           message        = Message from $domain_used_domain failed sender's DMARC policy, REJECT
   deny    dmarc_status   = reject
           !authenticated = *
           message        = Message from $domain_used_domain failed sender's DMARC policy, REJECT


@@ -1066,28 +1070,41 @@ Proxy Protocol server at 192.168.1.2 will look like this:
 
 3. In the ACL's the following expansion variables are available.
 
 
 3. In the ACL's the following expansion variables are available.
 

-proxy_host     The src IP of the proxy server making the connection
-proxy_port     The src port the proxy server is using
-proxy_session  Boolean, yes/no, the connected host is required to use
-               Proxy Protocol.
+proxy_host_address   The (internal) src IP of the proxy server
+                     making the connection to the Exim server.
+proxy_host_port      The (internal) src port the proxy server is
+                     using to connect to the Exim server.
+proxy_target_address The dest (public) IP of the remote host to
+                     the proxy server.
+proxy_target_port    The dest port the remote host is using to
+                     connect to the proxy server.
+proxy_session        Boolean, yes/no, the connected host is required
+                     to use Proxy Protocol.

 
 There is no expansion for a failed proxy session, however you can detect
 it by checking if $proxy_session is true but $proxy_host is empty.  As
 an example, in my connect ACL, I have:
 
   warn    condition      = ${if and{ {bool{$proxy_session}} \
 
 There is no expansion for a failed proxy session, however you can detect
 it by checking if $proxy_session is true but $proxy_host is empty.  As
 an example, in my connect ACL, I have:
 
   warn    condition      = ${if and{ {bool{$proxy_session}} \

-                                     {eq{$proxy_host}{}} } }
+                                     {eq{$proxy_host_address}{}} } }

           log_message    = Failed required proxy protocol negotiation \
                            from $sender_host_name [$sender_host_address]
 
   warn    condition      = ${if and{ {bool{$proxy_session}} \
           log_message    = Failed required proxy protocol negotiation \
                            from $sender_host_name [$sender_host_address]
 
   warn    condition      = ${if and{ {bool{$proxy_session}} \

-                                     {!eq{$proxy_host}{}} } }
+                                     {!eq{$proxy_host_address}{}} } }

           # But don't log health probes from the proxy itself
           # But don't log health probes from the proxy itself

-          condition      = ${if eq{$proxy_host}{$sender_host_address} \
+          condition      = ${if eq{$proxy_host_address}{$sender_host_address} \

                                 {false}{true}}
           log_message    = Successfully proxied from $sender_host_name \
                            [$sender_host_address] through proxy protocol \
                                 {false}{true}}
           log_message    = Successfully proxied from $sender_host_name \
                            [$sender_host_address] through proxy protocol \

-                           host $proxy_host
+                           host $proxy_host_address
+
+  # Possibly more clear
+  warn logwrite = Remote Source Address: $sender_host_address:$sender_host_port
+       logwrite = Proxy Target Address: $proxy_target_address:$proxy_target_port
+       logwrite = Proxy Internal Address: $proxy_host_address:$proxy_host_port
+       logwrite = Internal Server Address: $received_ip_address:$received_port
+

 
 4. Runtime issues to be aware of:
    - Since the real connections are all coming from your proxy, and the
 
 4. Runtime issues to be aware of:
    - Since the real connections are all coming from your proxy, and the