X-Git-Url: https://git.exim.org/users/heiko/exim.git/blobdiff_plain/3ecab1575ef1f45a5e7cd3c48cd937ffa8eb0ad9..0b969c4b8f7139537224878fb6159e4c98e81234:/doc/doc-txt/NewStuff?ds=inline diff --git a/doc/doc-txt/NewStuff b/doc/doc-txt/NewStuff index 4b9142238..2b038e32e 100644 --- a/doc/doc-txt/NewStuff +++ b/doc/doc-txt/NewStuff @@ -6,6 +6,155 @@ Before a formal release, there may be quite a lot of detail so that people can test from the snapshots or the CVS before the documentation is updated. Once the documentation is updated, this file is reduced to a short list. +Version 4.82 +------------ + + 1. New command-line option -bI:sieve will list all supported sieve extensions + of this Exim build on standard output, one per line. + ManageSieve (RFC 5804) providers managing scripts for use by Exim should + query this to establish the correct list to include in the protocol's + SIEVE capability line. + + 2. If the -n option is combined with the -bP option, then the name of an + emitted option is not output, only the value (if visible to you). + For instance, "exim -n -bP pid_file_path" should just emit a pathname + followed by a newline, and no other text. + + 3. When built with SUPPORT_TLS and USE_GNUTLS, the SMTP transport driver now + has a "tls_dh_min_bits" option, to set the minimum acceptable number of + bits in the Diffie-Hellman prime offered by a server (in DH ciphersuites) + acceptable for security. (Option accepted but ignored if using OpenSSL). + Defaults to 1024, the old value. May be lowered only to 512, or raised as + far as you like. Raising this may hinder TLS interoperability with other + sites and is not currently recommended. Lowering this will permit you to + establish a TLS session which is not as secure as you might like. + + Unless you really know what you are doing, leave it alone. + + 4. If not built with DISABLE_DNSSEC, Exim now has the main option + dns_dnssec_ok; if set to 1 then Exim will initialise the resolver library + to send the DO flag to your recursive resolver. If you have a recursive + resolver, which can set the Authenticated Data (AD) flag in results, Exim + can now detect this. Exim does not perform validation itself, instead + relying upon a trusted path to the resolver. + + Current status: work-in-progress; $sender_host_dnssec variable added. + + 5. DSCP support for outbound connections: on a transport using the smtp driver, + set "dscp = ef", for instance, to cause the connections to have the relevant + DSCP (IPv4 TOS or IPv6 TCLASS) value in the header. + + Similarly for inbound connections, there is a new control modifier, dscp, + so "warn control = dscp/ef" in the connect ACL, or after authentication. + + Supported values depend upon system libraries. "exim -bI:dscp" to list the + ones Exim knows of. You can also set a raw number 0..0x3F. + + 6. The -G command-line flag is no longer ignored; it is now equivalent to an + ACL setting "control = suppress_local_fixups". The -L command-line flag + is now accepted and forces use of syslog, with the provided tag as the + process name. A few other flags used by Sendmail are now accepted and + ignored. + + 7. New cutthrough routing feature. Requested by a "control = cutthrough_delivery" + ACL modifier; works for single-recipient mails which are recieved on and + deliverable via SMTP. Using the connection made for a recipient verify, + if requested before the verify, or a new one made for the purpose while + the inbound connection is still active. The bulk of the mail item is copied + direct from the inbound socket to the outbound (as well as the spool file). + When the source notifies the end of data, the data acceptance by the destination + is negociated before the acceptance is sent to the source. If the destination + does not accept the mail item, for example due to content-scanning, the item + is not accepted from the source and therefore there is no need to generate + a bounce mail. This is of benefit when providing a secondary-MX service. + The downside is that delays are under the control of the ultimate destination + system not your own. + + The Recieved-by: header on items delivered by cutthrough is generated + early in reception rather than at the end; this will affect any timestamp + included. The log line showing delivery is recorded before that showing + reception; it uses a new ">>" tag instead of "=>". + + To support the feature, verify-callout connections can now use ESMTP and TLS. + The usual smtp transport options are honoured, plus a (new, default everything) + hosts_verify_avoid_tls. + + New variable families named tls_in_cipher, tls_out_cipher etc. are introduced + for specific access to the information for each connection. The old names + are present for now but deprecated. + + Not yet supported: IGNOREQUOTA, SIZE, PIPELINING. + + 8. New expansion operators ${listnamed:name} to get the content of a named list + and ${listcount:string} to count the items in a list. + + 9. New global option "gnutls_enable_pkcs11", defaults false. The GnuTLS + rewrite in 4.80 combines with GnuTLS 2.12.0 or later, to autoload PKCS11 + modules. For some situations this is desirable, but we expect admin in + those situations to know they want the feature. More commonly, it means + that GUI user modules get loaded and are broken by the setuid Exim being + unable to access files specified in environment variables and passed + through, thus breakage. So we explicitly inhibit the PKCS11 initialisation + unless this new option is set. + +10. The "acl = name" condition on an ACL now supports optional arguments. + New expansion item "${acl {name}{arg}...}" and expansion condition + "acl {{name}{arg}...}" are added. In all cases up to nine arguments + can be used, appearing in $acl_arg1 to $acl_arg9 for the called ACL. + Variable $acl_narg contains the number of arguments. If the ACL sets + a "message =" value this becomes the result of the expansion item, + or the value of $value for the expansion condition. If the ACL returns + accept the expansion condition is true; if reject, false. A defer + return results in a forced fail. + +11. Routers and transports can now have multiple headers_add and headers_remove + option lines. The concatenated list is used. + +12. New ACL modifier "remove_header" can remove headers before message gets + handled by routers/transports. + +13. New dnsdb lookup pseudo-type "a+". A sequence of "a6" (if configured), + "aaaa" and "a" lookups is done and the full set of results returned. + +14. New expansion variable $headers_added with content from ACL add_header + modifier (but not yet added to messsage). + +15. New 8bitmime status logging option for received messages. Log field "M8S". + +16. New authenticated_sender logging option, adding to log field "A". + +17. New expansion variables $router_name and $transport_name. Useful + particularly for debug_print as -bt commandline option does not + require privilege whereas -d does. + +18. If built with EXPERIMENTAL_PRDR, per-recipient data responses per a + proposed extension to SMTP from Eric Hall. + +19. The pipe transport has gained the force_command option, to allow + decorating commands from user .forward pipe aliases with prefix + wrappers, for instance. + +20. Callout connections can now AUTH; the same controls as normal delivery + connections apply. + +21. Support for DMARC, using opendmarc libs, can be enabled. It adds new + options: dmarc_forensic_sender, dmarc_history_file, and dmarc_tld_file. + It adds new expansion variables $dmarc_ar_header, $dmarc_status, + $dmarc_status_text, and $dmarc_used_domain. It adds a new acl modifier + dmarc_status. It adds new control flags dmarc_disable_verify and + dmarc_enable_forensic. + +22. Add expansion variable $authenticated_fail_id, which is the username + provided to the authentication method which failed. It is available + for use in subsequent ACL processing (typically quit or notquit ACLs). + +23. New ACL modifer "udpsend" can construct a UDP packet to send to a given + UDP host and port. + +24. New ${hexquote:..string..} expansion operator converts non-printable + characters in the string to \xNN form. + + Version 4.80 ------------ @@ -76,7 +225,7 @@ Version 4.80 gnutls_require_mac & gnutls_require_protocols are no longer supported. tls_require_ciphers is now parsed by gnutls_priority_init(3) as a priority string, documentation for which is at: - http://www.gnu.org/software/gnutls/manual/html_node/Priority-Strings.html + http://www.gnutls.org/manual/html_node/Priority-Strings.html SNI support has been added to Exim's GnuTLS integration too. @@ -252,13 +401,13 @@ Version 4.73 then henceforth you will have to maintain your own local patches to strip the safeties off. - 8. There is a new expansion operator, bool_lax{}. Where bool{} uses the ACL + 8. There is a new expansion condition, bool_lax{}. Where bool{} uses the ACL condition logic to determine truth/failure and will fail to expand many strings, bool_lax{} uses the router condition logic, where most strings do evaluate true. Note: bool{00} is false, bool_lax{00} is true. - 9. Routers now support multiple "condition" tests, + 9. Routers now support multiple "condition" tests. 10. There is now a runtime configuration option "tcp_wrappers_daemon_name". Setting this allows an admin to define which entry in the tcpwrappers