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
--------------------------------------------------------------
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
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 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.
+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.
+
+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
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.
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.
git://git.exim.org / users / heiko / exim.git / blobdiff