Commit | Line | Data |
---|---|---|
495ae4b0 PH |
1 | New Features in Exim |
2 | -------------------- | |
3 | ||
38a0a95f PH |
4 | This file contains descriptions of new features that have been added to Exim. |
5 | Before a formal release, there may be quite a lot of detail so that people can | |
6 | test from the snapshots or the CVS before the documentation is updated. Once | |
7 | the documentation is updated, this file is reduced to a short list. | |
8 | ||
2c422e6f | 9 | Version 4.82 |
98a90c36 PP |
10 | ------------ |
11 | ||
12 | 1. New command-line option -bI:sieve will list all supported sieve extensions | |
13 | of this Exim build on standard output, one per line. | |
14 | ManageSieve (RFC 5804) providers managing scripts for use by Exim should | |
15 | query this to establish the correct list to include in the protocol's | |
16 | SIEVE capability line. | |
17 | ||
12f69989 PP |
18 | 2. If the -n option is combined with the -bP option, then the name of an |
19 | emitted option is not output, only the value (if visible to you). | |
20 | For instance, "exim -n -bP pid_file_path" should just emit a pathname | |
21 | followed by a newline, and no other text. | |
22 | ||
54c90be1 PP |
23 | 3. When built with SUPPORT_TLS and USE_GNUTLS, the SMTP transport driver now |
24 | has a "tls_dh_min_bits" option, to set the minimum acceptable number of | |
25 | bits in the Diffie-Hellman prime offered by a server (in DH ciphersuites) | |
26 | acceptable for security. (Option accepted but ignored if using OpenSSL). | |
27 | Defaults to 1024, the old value. May be lowered only to 512, or raised as | |
28 | far as you like. Raising this may hinder TLS interoperability with other | |
29 | sites and is not currently recommended. Lowering this will permit you to | |
30 | establish a TLS session which is not as secure as you might like. | |
31 | ||
32 | Unless you really know what you are doing, leave it alone. | |
33 | ||
1f4a55da PP |
34 | 4. If not built with DISABLE_DNSSEC, Exim now has the main option |
35 | dns_use_dnssec; if set to 1 then Exim will initialise the resolver library | |
36 | to send the DO flag to your recursive resolver. If you have a recursive | |
37 | resolver, which can set the Authenticated Data (AD) flag in results, Exim | |
38 | can now detect this. | |
39 | ||
40 | Current status: work-in-progress; $sender_host_dnssec variable added. | |
41 | ||
36a3ae5f PP |
42 | 5. DSCP support for outbound connections: on a transport using the smtp driver, |
43 | set "dscp = ef", for instance, to cause the connections to have the relevant | |
13363eba PP |
44 | DSCP (IPv4 TOS or IPv6 TCLASS) value in the header. |
45 | ||
46 | Similarly for inbound connections, there is a new control modifier, dscp, | |
47 | so "warn control = dscp/ef" in the connect ACL, or after authentication. | |
48 | ||
49 | Supported values depend upon system libraries. "exim -bI:dscp" to list the | |
50 | ones Exim knows of. You can also set a raw number 0..0x3F. | |
36a3ae5f | 51 | |
f4ee74ac PP |
52 | 6. The -G command-line flag is no longer ignored; it is now equivalent to an |
53 | ACL setting "control = suppress_local_fixups". The -L command-line flag | |
54 | is now accepted and forces use of syslog, with the provided tag as the | |
55 | process name. A few other flags used by Sendmail are now accepted and | |
56 | ignored. | |
57 | ||
976b7e9f JH |
58 | 7. New cutthrough routing feature. Requested by a "control = cutthrough_delivery" |
59 | ACL modifier; works for single-recipient mails which are recieved on and | |
60 | deliverable via SMTP. Using the connection made for a recipient verify, | |
61 | if requested before the verify, or a new one made for the purpose while | |
62 | the inbound connection is still active. The bulk of the mail item is copied | |
63 | direct from the inbound socket to the outbound (as well as the spool file). | |
64 | When the source notifies the end of data, the data acceptance by the destination | |
65 | is negociated before the acceptance is sent to the source. If the destination | |
66 | does not accept the mail item, for example due to content-scanning, the item | |
67 | is not accepted from the source and therefore there is no need to generate | |
68 | a bounce mail. This is of benefit when providing a secondary-MX service. | |
69 | The downside is that delays are under the control of the ultimate destination | |
70 | system not your own. | |
71 | ||
72 | The Recieved-by: header on items delivered by cutthrough is generated | |
042eb971 | 73 | early in reception rather than at the end; this will affect any timestamp |
976b7e9f JH |
74 | included. The log line showing delivery is recorded before that showing |
75 | reception; it uses a new ">>" tag instead of "=>". | |
06a6f4ed | 76 | |
976b7e9f JH |
77 | To support the feature, verify-callout connections can now use ESMTP and TLS. |
78 | The usual smtp transport options are honoured, plus a (new, default everything) | |
79 | hosts_verify_avoid_tls. | |
80 | ||
81 | New variable families named tls_in_cipher, tls_out_cipher etc. are introduced | |
82 | for specific access to the information for each connection. The old names | |
83 | are present for now but deprecated. | |
84 | ||
85 | Not yet supported: IGNOREQUOTA, SIZE, PIPELINING, AUTH. | |
86 | ||
a64a3dfa JH |
87 | 8. New expansion operators ${listnamed:name} to get the content of a named list |
88 | and ${listcount:string} to count the items in a list. | |
98a90c36 | 89 | |
a5f239e4 PP |
90 | 9. New global option "gnutls_enable_pkcs11", defaults false. The GnuTLS |
91 | rewrite in 4.80 combines with GnuTLS 2.12.0 or later, to autoload PKCS11 | |
92 | modules. For some situations this is desirable, but we expect admin in | |
93 | those situations to know they want the feature. More commonly, it means | |
94 | that GUI user modules get loaded and are broken by the setuid Exim being | |
95 | unable to access files specified in environment variables and passed | |
96 | through, thus breakage. So we explicitly inhibit the PKCS11 initialisation | |
97 | unless this new option is set. | |
98 | ||
3e8abda0 | 99 | 10. The "acl = name" condition on an ACL now supports optional arguments. |
bef3ea7f JH |
100 | New expansion item "${acl {name}{arg}...}" and expansion condition |
101 | "acl {{name}{arg}...}" are added. In all cases up to nine arguments | |
102 | can be used, appearing in $acl_arg1 to $acl_arg9 for the called ACL. | |
103 | Variable $acl_narg contains the number of arguments. If the ACL sets | |
104 | a "message =" value this becomes the result of the expansion item, | |
105 | or the value of $value for the expansion condition. If the ACL returns | |
106 | accept the expansion condition is true; if reject, false. A defer | |
107 | return results in a forced fail. | |
a5f239e4 | 108 | |
846726c5 JH |
109 | 11. Routers and transports can now have multiple headers_add and headers_remove |
110 | option lines. The concatenated list is used. | |
111 | ||
e7568d51 TL |
112 | 12. New ACL modifier "remove_header" can remove headers before message gets |
113 | handled by routers/transports. | |
114 | ||
3a796370 JH |
115 | 13. New dnsdb lookup pseudo-type "a+". A sequence of "a6" (if configured), |
116 | "aaaa" and "a" lookups is done and the full set of results returned. | |
117 | ||
362145b5 JH |
118 | 14. New expansion variable $headers_added with content from ACL add_header |
119 | modifier (but not yet added to messsage). | |
120 | ||
bd0fff00 | 121 | 15. New 8bitmime status logging option for received messages. Log field "M8S". |
3c0a92dc | 122 | |
c8e2fc1e JH |
123 | 16. New authenticated_sender logging option, adding to log field "A". |
124 | ||
06a6f4ed | 125 | |
b1770b6e | 126 | Version 4.80 |
c1e794ba PP |
127 | ------------ |
128 | ||
129 | 1. New authenticator driver, "gsasl". Server-only (at present). | |
130 | This is a SASL interface, licensed under GPL, which can be found at | |
131 | http://www.gnu.org/software/gsasl/. | |
132 | This system does not provide sources of data for authentication, so | |
3b4f55a3 | 133 | careful use needs to be made of the conditions in Exim. |
c1e794ba | 134 | |
97753960 PP |
135 | 2. New authenticator driver, "heimdal_gssapi". Server-only. |
136 | A replacement for using cyrus_sasl with Heimdal, now that $KRB5_KTNAME | |
137 | is no longer honoured for setuid programs by Heimdal. Use the | |
138 | "server_keytab" option to point to the keytab. | |
139 | ||
252e0c7b PP |
140 | 3. The "pkg-config" system can now be used when building Exim to reference |
141 | cflags and library information for lookups and authenticators, rather | |
142 | than having to update "CFLAGS", "AUTH_LIBS", "LOOKUP_INCLUDE" and | |
7e6a8985 PP |
143 | "LOOKUP_LIBS" directly. Similarly for handling the TLS library support |
144 | without adjusting "TLS_INCLUDE" and "TLS_LIBS". | |
252e0c7b | 145 | |
6a6084f8 PP |
146 | In addition, setting PCRE_CONFIG=yes will query the pcre-config tool to |
147 | find the headers and libraries for PCRE. | |
148 | ||
f1e05cc7 | 149 | 4. New expansion variable $tls_bits. |
20aa9dbd | 150 | |
4a6a987a PP |
151 | 5. New lookup type, "dbmjz". Key is an Exim list, the elements of which will |
152 | be joined together with ASCII NUL characters to construct the key to pass | |
3b4f55a3 PP |
153 | into the DBM library. Can be used with gsasl to access sasldb2 files as |
154 | used by Cyrus SASL. | |
4a6a987a | 155 | |
da3ad30d PP |
156 | 6. OpenSSL now supports TLS1.1 and TLS1.2 with OpenSSL 1.0.1. |
157 | ||
158 | Avoid release 1.0.1a if you can. Note that the default value of | |
159 | "openssl_options" is no longer "+dont_insert_empty_fragments", as that | |
160 | increased susceptibility to attack. This may still have interoperability | |
161 | implications for very old clients (see version 4.31 change 37) but | |
162 | administrators can choose to make the trade-off themselves and restore | |
163 | compatibility at the cost of session security. | |
164 | ||
7be682ca PP |
165 | 7. Use of the new expansion variable $tls_sni in the main configuration option |
166 | tls_certificate will cause Exim to re-expand the option, if the client | |
167 | sends the TLS Server Name Indication extension, to permit choosing a | |
168 | different certificate; tls_privatekey will also be re-expanded. You must | |
169 | still set these options to expand to valid files when $tls_sni is not set. | |
3f0945ff PP |
170 | |
171 | The SMTP Transport has gained the option tls_sni, which will set a hostname | |
172 | for outbound TLS sessions, and set $tls_sni too. | |
173 | ||
174 | A new log_selector, +tls_sni, has been added, to log received SNI values | |
175 | for Exim as a server. | |
176 | ||
9cbad13b PP |
177 | 8. The existing "accept_8bitmime" option now defaults to true. This means |
178 | that Exim is deliberately not strictly RFC compliant. We're following | |
179 | Dan Bernstein's advice in http://cr.yp.to/smtp/8bitmime.html by default. | |
180 | Those who disagree, or know that they are talking to mail servers that, | |
181 | even today, are not 8-bit clean, need to turn off this option. | |
182 | ||
9ee44efb PP |
183 | 9. Exim can now be started with -bw (with an optional timeout, given as |
184 | -bw<timespec>). With this, stdin at startup is a socket that is | |
185 | already listening for connections. This has a more modern name of | |
186 | "socket activation", but forcing the activated socket to fd 0. We're | |
187 | interested in adding more support for modern variants. | |
188 | ||
eae0036b | 189 | 10. ${eval } now uses 64-bit values on supporting platforms. A new "G" suffix |
97d17305 JH |
190 | for numbers indicates multiplication by 1024^3. |
191 | ||
17c76198 PP |
192 | 11. The GnuTLS support has been revamped; the three options gnutls_require_kx, |
193 | gnutls_require_mac & gnutls_require_protocols are no longer supported. | |
194 | tls_require_ciphers is now parsed by gnutls_priority_init(3) as a priority | |
195 | string, documentation for which is at: | |
196 | http://www.gnu.org/software/gnutls/manual/html_node/Priority-Strings.html | |
197 | ||
198 | SNI support has been added to Exim's GnuTLS integration too. | |
199 | ||
af3498d6 PP |
200 | For sufficiently recent GnuTLS libraries, ${randint:..} will now use |
201 | gnutls_rnd(), asking for GNUTLS_RND_NONCE level randomness. | |
202 | ||
53947857 | 203 | 12. With OpenSSL, if built with EXPERIMENTAL_OCSP, a new option tls_ocsp_file |
3f7eeb86 PP |
204 | is now available. If the contents of the file are valid, then Exim will |
205 | send that back in response to a TLS status request; this is OCSP Stapling. | |
206 | Exim will not maintain the contents of the file in any way: administrators | |
207 | are responsible for ensuring that it is up-to-date. | |
208 | ||
209 | See "experimental-spec.txt" for more details. | |
210 | ||
eae0036b PP |
211 | 13. ${lookup dnsdb{ }} supports now SPF record types. They are handled |
212 | identically to TXT record lookups. | |
213 | ||
2605c55b | 214 | 14. New expansion variable $tod_epoch_l for higher-precision time. |
c1e794ba | 215 | |
3375e053 PP |
216 | 15. New global option tls_dh_max_bits, defaulting to current value of NSS |
217 | hard-coded limit of DH ephemeral bits, to fix interop problems caused by | |
218 | GnuTLS 2.12 library recommending a bit count higher than NSS supports. | |
219 | ||
a799883d PP |
220 | 16. tls_dhparam now used by both OpenSSL and GnuTLS, can be path or identifier. |
221 | Option can now be a path or an identifier for a standard prime. | |
222 | If unset, we use the DH prime from section 2.2 of RFC 5114, "ike23". | |
223 | Set to "historic" to get the old GnuTLS behaviour of auto-generated DH | |
224 | primes. | |
225 | ||
3ecab157 | 226 | 17. SSLv2 now disabled by default in OpenSSL. (Never supported by GnuTLS). |
f0f5a555 PP |
227 | Use "openssl_options -no_sslv2" to re-enable support, if your OpenSSL |
228 | install was not built with OPENSSL_NO_SSL2 ("no-ssl2"). | |
229 | ||
9e45c72b | 230 | |
3ce96ada TF |
231 | Version 4.77 |
232 | ------------ | |
233 | ||
234 | 1. New options for the ratelimit ACL condition: /count= and /unique=. | |
235 | The /noupdate option has been replaced by a /readonly option. | |
236 | ||
061b7ebd PP |
237 | 2. The SMTP transport's protocol option may now be set to "smtps", to |
238 | use SSL-on-connect outbound. | |
239 | ||
9e949f00 PP |
240 | 3. New variable $av_failed, set true if the AV scanner deferred; ie, when |
241 | there is a problem talking to the AV scanner, or the AV scanner running. | |
242 | ||
39257585 PP |
243 | 4. New expansion conditions, "inlist" and "inlisti", which take simple lists |
244 | and check if the search item is a member of the list. This does not | |
245 | support named lists, but does subject the list part to string expansion. | |
246 | ||
247 | 5. Unless the new EXPAND_LISTMATCH_RHS build option is set when Exim was | |
248 | built, Exim no longer performs string expansion on the second string of | |
249 | the match_* expansion conditions: "match_address", "match_domain", | |
250 | "match_ip" & "match_local_part". Named lists can still be used. | |
251 | ||
7c6d71af | 252 | |
e97d1f08 PP |
253 | Version 4.76 |
254 | ------------ | |
255 | ||
256 | 1. The global option "dns_use_edns0" may be set to coerce EDNS0 usage on | |
257 | or off in the resolver library. | |
258 | ||
259 | ||
bc19a55b PP |
260 | Version 4.75 |
261 | ------------ | |
262 | ||
263 | 1. In addition to the existing LDAP and LDAP/SSL ("ldaps") support, there | |
264 | is now LDAP/TLS support, given sufficiently modern OpenLDAP client | |
265 | libraries. The following global options have been added in support of | |
266 | this: ldap_ca_cert_dir, ldap_ca_cert_file, ldap_cert_file, ldap_cert_key, | |
267 | ldap_cipher_suite, ldap_require_cert, ldap_start_tls. | |
268 | ||
2fe76745 PP |
269 | 2. The pipe transport now takes a boolean option, "freeze_signal", default |
270 | false. When true, if the external delivery command exits on a signal then | |
271 | Exim will freeze the message in the queue, instead of generating a bounce. | |
272 | ||
f1e5fef5 PP |
273 | 3. Log filenames may now use %M as an escape, instead of %D (still available). |
274 | The %M pattern expands to yyyymm, providing month-level resolution. | |
275 | ||
332f5cf3 PP |
276 | 4. The $message_linecount variable is now updated for the maildir_tag option, |
277 | in the same way as $message_size, to reflect the real number of lines, | |
278 | including any header additions or removals from transport. | |
279 | ||
29cfeb94 PP |
280 | 5. When contacting a pool of SpamAssassin servers configured in spamd_address, |
281 | Exim now selects entries randomly, to better scale in a cluster setup. | |
282 | ||
bc19a55b | 283 | |
a01ba081 PP |
284 | Version 4.74 |
285 | ------------ | |
286 | ||
1670ef10 PP |
287 | 1. SECURITY FIX: privilege escalation flaw fixed. On Linux (and only Linux) |
288 | the flaw permitted the Exim run-time user to cause root to append to | |
289 | arbitrary files of the attacker's choosing, with the content based | |
290 | on content supplied by the attacker. | |
291 | ||
292 | 2. Exim now supports loading some lookup types at run-time, using your | |
a01ba081 PP |
293 | platform's dlopen() functionality. This has limited platform support |
294 | and the intention is not to support every variant, it's limited to | |
295 | dlopen(). This permits the main Exim binary to not be linked against | |
296 | all the libraries needed for all the lookup types. | |
297 | ||
298 | ||
77bb000f PP |
299 | Version 4.73 |
300 | ------------ | |
301 | ||
2cfd3221 PP |
302 | NOTE: this version is not guaranteed backwards-compatible, please read the |
303 | items below carefully | |
304 | ||
77bb000f PP |
305 | 1. A new main configuration option, "openssl_options", is available if Exim |
306 | is built with SSL support provided by OpenSSL. The option allows | |
307 | administrators to specify OpenSSL options to be used on connections; | |
308 | typically this is to set bug compatibility features which the OpenSSL | |
309 | developers have not enabled by default. There may be security | |
310 | consequences for certain options, so these should not be changed | |
311 | frivolously. | |
312 | ||
a29e5231 PP |
313 | 2. A new pipe transport option, "permit_coredumps", may help with problem |
314 | diagnosis in some scenarios. Note that Exim is typically installed as | |
315 | a setuid binary, which on most OSes will inhibit coredumps by default, | |
43236f35 | 316 | so that safety mechanism would have to be overridden for this option to |
a29e5231 PP |
317 | be able to take effect. |
318 | ||
8544e77a PP |
319 | 3. ClamAV 0.95 is now required for ClamAV support in Exim, unless |
320 | Local/Makefile sets: WITH_OLD_CLAMAV_STREAM=yes | |
321 | Note that this switches Exim to use a new API ("INSTREAM") and a future | |
322 | release of ClamAV will remove support for the old API ("STREAM"). | |
323 | ||
324 | The av_scanner option, when set to "clamd", now takes an optional third | |
325 | part, "local", which causes Exim to pass a filename to ClamAV instead of | |
326 | the file content. This is the same behaviour as when clamd is pointed at | |
327 | a Unix-domain socket. For example: | |
328 | ||
329 | av_scanner = clamd:192.0.2.3 1234:local | |
330 | ||
491fab4c PP |
331 | ClamAV's ExtendedDetectionInfo response format is now handled. |
332 | ||
8544e77a PP |
333 | 4. There is now a -bmalware option, restricted to admin users. This option |
334 | takes one parameter, a filename, and scans that file with Exim's | |
335 | malware-scanning framework. This is intended purely as a debugging aid | |
336 | to ensure that Exim's scanning is working, not to replace other tools. | |
a9622bc6 PP |
337 | Note that the ACL framework is not invoked, so if av_scanner references |
338 | ACL variables without a fallback then this will fail. | |
8544e77a | 339 | |
83e029d5 PP |
340 | 5. There is a new expansion operator, "reverse_ip", which will reverse IP |
341 | addresses; IPv4 into dotted quad, IPv6 into dotted nibble. Examples: | |
342 | ||
343 | ${reverse_ip:192.0.2.4} | |
344 | -> 4.2.0.192 | |
345 | ${reverse_ip:2001:0db8:c42:9:1:abcd:192.0.2.3} | |
346 | -> 3.0.2.0.0.0.0.c.d.c.b.a.1.0.0.0.9.0.0.0.2.4.c.0.8.b.d.0.1.0.0.2 | |
347 | ||
ed7f7860 PP |
348 | 6. There is a new ACL control called "debug", to enable debug logging. |
349 | This allows selective logging of certain incoming transactions within | |
350 | production environments, with some care. It takes two options, "tag" | |
351 | and "opts"; "tag" is included in the filename of the log and "opts" | |
352 | is used as per the -d<options> command-line option. Examples, which | |
353 | don't all make sense in all contexts: | |
354 | ||
355 | control = debug | |
356 | control = debug/tag=.$sender_host_address | |
357 | control = debug/opts=+expand+acl | |
358 | control = debug/tag=.$message_exim_id/opts=+expand | |
359 | ||
10385c15 PP |
360 | 7. It has always been implicit in the design and the documentation that |
361 | "the Exim user" is not root. src/EDITME said that using root was | |
362 | "very strongly discouraged". This is not enough to keep people from | |
363 | shooting themselves in the foot in days when many don't configure Exim | |
364 | themselves but via package build managers. The security consequences of | |
365 | running various bits of network code are severe if there should be bugs in | |
366 | them. As such, the Exim user may no longer be root. If configured | |
367 | statically, Exim will refuse to build. If configured as ref:user then Exim | |
368 | will exit shortly after start-up. If you must shoot yourself in the foot, | |
369 | then henceforth you will have to maintain your own local patches to strip | |
370 | the safeties off. | |
371 | ||
06a6f4ed | 372 | 8. There is a new expansion condition, bool_lax{}. Where bool{} uses the ACL |
6a8de854 PP |
373 | condition logic to determine truth/failure and will fail to expand many |
374 | strings, bool_lax{} uses the router condition logic, where most strings | |
375 | do evaluate true. | |
376 | Note: bool{00} is false, bool_lax{00} is true. | |
377 | ||
06a6f4ed | 378 | 9. Routers now support multiple "condition" tests. |
532be449 | 379 | |
5dc43717 JJ |
380 | 10. There is now a runtime configuration option "tcp_wrappers_daemon_name". |
381 | Setting this allows an admin to define which entry in the tcpwrappers | |
382 | config file will be used to control access to the daemon. This option | |
383 | is only available when Exim is built with USE_TCP_WRAPPERS. The | |
384 | default value is set at build time using the TCP_WRAPPERS_DAEMON_NAME | |
385 | build option. | |
386 | ||
79d4bc3d PP |
387 | 11. [POSSIBLE CONFIG BREAKAGE] The default value for system_filter_user is now |
388 | the Exim run-time user, instead of root. | |
389 | ||
2cfd3221 PP |
390 | 12. [POSSIBLE CONFIG BREAKAGE] ALT_CONFIG_ROOT_ONLY is no longer optional and |
391 | is forced on. This is mitigated by the new build option | |
90b6341f | 392 | TRUSTED_CONFIG_LIST which defines a list of configuration files which |
7f7f0545 DW |
393 | are trusted; one per line. If a config file is owned by root and matches |
394 | a pathname in the list, then it may be invoked by the Exim build-time | |
395 | user without Exim relinquishing root privileges. | |
2cfd3221 PP |
396 | |
397 | 13. [POSSIBLE CONFIG BREAKAGE] The Exim user is no longer automatically | |
398 | trusted to supply -D<Macro[=Value]> overrides on the command-line. Going | |
90b6341f DW |
399 | forward, we recommend using TRUSTED_CONFIG_LIST with shim configs that |
400 | include the main config. As a transition mechanism, we are temporarily | |
401 | providing a work-around: the new build option WHITELIST_D_MACROS provides | |
43236f35 | 402 | a colon-separated list of macro names which may be overridden by the Exim |
90b6341f DW |
403 | run-time user. The values of these macros are constrained to the regex |
404 | ^[A-Za-z0-9_/.-]*$ (which explicitly does allow for empty values). | |
2cfd3221 | 405 | |
77bb000f | 406 | |
3fc596e4 NM |
407 | Version 4.72 |
408 | ------------ | |
409 | ||
b26eacf1 PP |
410 | 1. TWO SECURITY FIXES: one relating to mail-spools which are globally |
411 | writable, the other to locking of MBX folders (not mbox). | |
412 | ||
413 | 2. MySQL stored procedures are now supported. | |
414 | ||
415 | 3. The dkim_domain transport option is now a list, not a single string, and | |
416 | messages will be signed for each element in the list (discarding | |
417 | duplicates). | |
418 | ||
419 | 4. The 4.70 release unexpectedly changed the behaviour of dnsdb TXT lookups | |
420 | in the presence of multiple character strings within the RR. Prior to 4.70, | |
421 | only the first string would be returned. The dnsdb lookup now, by default, | |
422 | preserves the pre-4.70 semantics, but also now takes an extended output | |
8f425947 PP |
423 | separator specification. The separator can be followed by a semicolon, to |
424 | concatenate the individual text strings together with no join character, | |
425 | or by a comma and a second separator character, in which case the text | |
426 | strings within a TXT record are joined on that second character. | |
427 | Administrators are reminded that DNS provides no ordering guarantees | |
428 | between multiple records in an RRset. For example: | |
b26eacf1 PP |
429 | |
430 | foo.example. IN TXT "a" "b" "c" | |
431 | foo.example. IN TXT "d" "e" "f" | |
432 | ||
433 | ${lookup dnsdb{>/ txt=foo.example}} -> "a/d" | |
434 | ${lookup dnsdb{>/; txt=foo.example}} -> "def/abc" | |
8f425947 | 435 | ${lookup dnsdb{>/,+ txt=foo.example}} -> "a+b+c/d+e+f" |
b26eacf1 | 436 | |
3fc596e4 | 437 | |
f33253cc NM |
438 | Version 4.70 / 4.71 |
439 | ------------------- | |
65a7d8c3 | 440 | |
7c6d71af | 441 | 1. Native DKIM support without an external library. |
a8c8d6b5 JJ |
442 | (Note that if no action to prevent it is taken, a straight upgrade will |
443 | result in DKIM verification of all signed incoming emails. See spec | |
444 | for details on conditionally disabling) | |
7c6d71af NM |
445 | |
446 | 2. Experimental DCC support via dccifd (contributed by Wolfgang Breyha). | |
65a7d8c3 | 447 | |
f33253cc | 448 | 3. There is now a bool{} expansion condition which maps certain strings to |
7d9f747b | 449 | true/false condition values (most likely of use in conjunction with the |
f33253cc NM |
450 | and{} expansion operator). |
451 | ||
452 | 4. The $spam_score, $spam_bar and $spam_report variables are now available | |
453 | at delivery time. | |
454 | ||
455 | 5. exim -bP now supports "macros", "macro_list" or "macro MACRO_NAME" as | |
456 | options, provided that Exim is invoked by an admin_user. | |
457 | ||
458 | 6. There is a new option gnutls_compat_mode, when linked against GnuTLS, | |
459 | which increases compatibility with older clients at the cost of decreased | |
460 | security. Don't set this unless you need to support such clients. | |
461 | ||
462 | 7. There is a new expansion operator, ${randint:...} which will produce a | |
463 | "random" number less than the supplied integer. This randomness is | |
464 | not guaranteed to be cryptographically strong, but depending upon how | |
465 | Exim was built may be better than the most naive schemes. | |
466 | ||
467 | 8. Exim now explicitly ensures that SHA256 is available when linked against | |
468 | OpenSSL. | |
469 | ||
470 | 9. The transport_filter_timeout option now applies to SMTP transports too. | |
471 | ||
65a7d8c3 | 472 | |
7d9f747b PP |
473 | Version 4.69 |
474 | ------------ | |
475 | ||
476 | 1. Preliminary DKIM support in Experimental. | |
477 | ||
478 | ||
2b85bce7 PH |
479 | Version 4.68 |
480 | ------------ | |
481 | ||
482 | 1. The body_linecount and body_zerocount C variables are now exported in the | |
483 | local_scan API. | |
484 | ||
93655c46 PH |
485 | 2. When a dnslists lookup succeeds, the key that was looked up is now placed |
486 | in $dnslist_matched. When the key is an IP address, it is not reversed in | |
487 | this variable (though it is, of course, in the actual lookup). In simple | |
488 | cases, for example: | |
489 | ||
490 | deny dnslists = spamhaus.example | |
491 | ||
492 | the key is also available in another variable (in this case, | |
493 | $sender_host_address). In more complicated cases, however, this is not | |
494 | true. For example, using a data lookup might generate a dnslists lookup | |
495 | like this: | |
496 | ||
497 | deny dnslists = spamhaus.example/<|192.168.1.2|192.168.6.7|... | |
498 | ||
499 | If this condition succeeds, the value in $dnslist_matched might be | |
500 | 192.168.6.7 (for example). | |
501 | ||
6c512171 PH |
502 | 3. Authenticators now have a client_condition option. When Exim is running as |
503 | a client, it skips an authenticator whose client_condition expansion yields | |
504 | "0", "no", or "false". This can be used, for example, to skip plain text | |
505 | authenticators when the connection is not encrypted by a setting such as: | |
506 | ||
507 | client_condition = ${if !eq{$tls_cipher}{}} | |
508 | ||
509 | Note that the 4.67 documentation states that $tls_cipher contains the | |
510 | cipher used for incoming messages. In fact, during SMTP delivery, it | |
511 | contains the cipher used for the delivery. The same is true for | |
512 | $tls_peerdn. | |
513 | ||
a96603a0 PH |
514 | 4. There is now a -Mvc <message-id> option, which outputs a copy of the |
515 | message to the standard output, in RFC 2822 format. The option can be used | |
516 | only by an admin user. | |
517 | ||
8f240103 PH |
518 | 5. There is now a /noupdate option for the ratelimit ACL condition. It |
519 | computes the rate and checks the limit as normal, but it does not update | |
520 | the saved data. This means that, in relevant ACLs, it is possible to lookup | |
521 | the existence of a specified (or auto-generated) ratelimit key without | |
522 | incrementing the ratelimit counter for that key. | |
523 | ||
524 | In order for this to be useful, another ACL entry must set the rate | |
525 | for the same key somewhere (otherwise it will always be zero). | |
526 | ||
527 | Example: | |
528 | ||
529 | acl_check_connect: | |
530 | # Read the rate; if it doesn't exist or is below the maximum | |
531 | # we update it below | |
532 | deny ratelimit = 100 / 5m / strict / noupdate | |
533 | log_message = RATE: $sender_rate / $sender_rate_period \ | |
534 | (max $sender_rate_limit) | |
535 | ||
536 | [... some other logic and tests...] | |
537 | ||
538 | warn ratelimit = 100 / 5m / strict / per_cmd | |
539 | log_message = RATE UPDATE: $sender_rate / $sender_rate_period \ | |
540 | (max $sender_rate_limit) | |
541 | condition = ${if le{$sender_rate}{$sender_rate_limit}} | |
542 | ||
543 | accept | |
544 | ||
d677b2f2 PH |
545 | 6. The variable $max_received_linelength contains the number of bytes in the |
546 | longest line that was received as part of the message, not counting the | |
547 | line termination character(s). | |
548 | ||
d52120f2 PH |
549 | 7. Host lists can now include +ignore_defer and +include_defer, analagous to |
550 | +ignore_unknown and +include_unknown. These options should be used with | |
551 | care, probably only in non-critical host lists such as whitelists. | |
552 | ||
8669f003 PH |
553 | 8. There's a new option called queue_only_load_latch, which defaults true. |
554 | If set false when queue_only_load is greater than zero, Exim re-evaluates | |
555 | the load for each incoming message in an SMTP session. Otherwise, once one | |
556 | message is queued, the remainder are also. | |
557 | ||
4f054c63 | 558 | 9. There is a new ACL, specified by acl_smtp_notquit, which is run in most |
8f128379 PH |
559 | cases when an SMTP session ends without sending QUIT. However, when Exim |
560 | itself is is bad trouble, such as being unable to write to its log files, | |
561 | this ACL is not run, because it might try to do things (such as write to | |
562 | log files) that make the situation even worse. | |
563 | ||
564 | Like the QUIT ACL, this new ACL is provided to make it possible to gather | |
565 | statistics. Whatever it returns (accept or deny) is immaterial. The "delay" | |
566 | modifier is forbidden in this ACL. | |
567 | ||
568 | When the NOTQUIT ACL is running, the variable $smtp_notquit_reason is set | |
569 | to a string that indicates the reason for the termination of the SMTP | |
570 | connection. The possible values are: | |
571 | ||
572 | acl-drop Another ACL issued a "drop" command | |
573 | bad-commands Too many unknown or non-mail commands | |
574 | command-timeout Timeout while reading SMTP commands | |
575 | connection-lost The SMTP connection has been lost | |
576 | data-timeout Timeout while reading message data | |
577 | local-scan-error The local_scan() function crashed | |
578 | local-scan-timeout The local_scan() function timed out | |
579 | signal-exit SIGTERM or SIGINT | |
580 | synchronization-error SMTP synchronization error | |
581 | tls-failed TLS failed to start | |
582 | ||
583 | In most cases when an SMTP connection is closed without having received | |
584 | QUIT, Exim sends an SMTP response message before actually closing the | |
585 | connection. With the exception of acl-drop, the default message can be | |
586 | overridden by the "message" modifier in the NOTQUIT ACL. In the case of a | |
587 | "drop" verb in another ACL, it is the message from the other ACL that is | |
588 | used. | |
589 | ||
b7670459 PH |
590 | 10. For MySQL and PostgreSQL lookups, it is now possible to specify a list of |
591 | servers with individual queries. This is done by starting the query with | |
592 | "servers=x:y:z;", where each item in the list may take one of two forms: | |
593 | ||
594 | (1) If it is just a host name, the appropriate global option (mysql_servers | |
595 | or pgsql_servers) is searched for a host of the same name, and the | |
596 | remaining parameters (database, user, password) are taken from there. | |
597 | ||
598 | (2) If it contains any slashes, it is taken as a complete parameter set. | |
599 | ||
600 | The list of servers is used in exactly the same was as the global list. | |
601 | Once a connection to a server has happened and a query has been | |
602 | successfully executed, processing of the lookup ceases. | |
603 | ||
604 | This feature is intended for use in master/slave situations where updates | |
605 | are occurring, and one wants to update a master rather than a slave. If the | |
606 | masters are in the list for reading, you might have: | |
607 | ||
608 | mysql_servers = slave1/db/name/pw:slave2/db/name/pw:master/db/name/pw | |
609 | ||
610 | In an updating lookup, you could then write | |
611 | ||
612 | ${lookup mysql{servers=master; UPDATE ...} | |
613 | ||
614 | If, on the other hand, the master is not to be used for reading lookups: | |
615 | ||
616 | pgsql_servers = slave1/db/name/pw:slave2/db/name/pw | |
617 | ||
618 | you can still update the master by | |
619 | ||
620 | ${lookup pgsql{servers=master/db/name/pw; UPDATE ...} | |
621 | ||
ddea74fa PH |
622 | 11. The message_body_newlines option (default FALSE, for backwards |
623 | compatibility) can be used to control whether newlines are present in | |
624 | $message_body and $message_body_end. If it is FALSE, they are replaced by | |
625 | spaces. | |
626 | ||
2b85bce7 | 627 | |
b4ed4da0 PH |
628 | Version 4.67 |
629 | ------------ | |
630 | ||
631 | 1. There is a new log selector called smtp_no_mail, which is not included in | |
632 | the default setting. When it is set, a line is written to the main log | |
633 | whenever an accepted SMTP connection terminates without having issued a | |
4aa45c31 | 634 | MAIL command. |
b4ed4da0 | 635 | |
431b7361 | 636 | 2. When an item in a dnslists list is followed by = and & and a list of IP |
4aa45c31 PH |
637 | addresses, the behaviour was not clear when the lookup returned more than |
638 | one IP address. This has been solved by the addition of == and =& for "all" | |
93655c46 | 639 | rather than the default "any" matching. |
431b7361 | 640 | |
4aa45c31 PH |
641 | 3. Up till now, the only control over which cipher suites GnuTLS uses has been |
642 | for the cipher algorithms. New options have been added to allow some of the | |
643 | other parameters to be varied. | |
431b7361 | 644 | |
4aa45c31 PH |
645 | 4. There is a new compile-time option called ENABLE_DISABLE_FSYNC. When it is |
646 | set, Exim compiles a runtime option called disable_fsync. | |
431b7361 | 647 | |
4aa45c31 | 648 | 5. There is a new variable called $smtp_count_at_connection_start. |
431b7361 | 649 | |
4aa45c31 | 650 | 6. There's a new control called no_pipelining. |
cf8b11a5 | 651 | |
41c7c167 | 652 | 7. There are two new variables called $sending_ip_address and $sending_port. |
4aa45c31 | 653 | These are set whenever an SMTP connection to another host has been set up. |
41c7c167 PH |
654 | |
655 | 8. The expansion of the helo_data option in the smtp transport now happens | |
4aa45c31 | 656 | after the connection to the server has been made. |
41c7c167 | 657 | |
9c57cbc0 | 658 | 9. There is a new expansion operator ${rfc2047d: that decodes strings that |
4aa45c31 | 659 | are encoded as per RFC 2047. |
9c57cbc0 | 660 | |
f3f065bb PH |
661 | 10. There is a new log selector called "pid", which causes the current process |
662 | id to be added to every log line, in square brackets, immediately after the | |
663 | time and date. | |
664 | ||
047bdd8c | 665 | 11. Exim has been modified so that it flushes SMTP output before implementing |
4c590bd1 PH |
666 | a delay in an ACL. It also flushes the output before performing a callout, |
667 | as this can take a substantial time. These behaviours can be disabled by | |
668 | obeying control = no_delay_flush or control = no_callout_flush, | |
4aa45c31 | 669 | respectively, at some earlier stage of the connection. |
047bdd8c | 670 | |
0ce9abe6 | 671 | 12. There are two new expansion conditions that iterate over a list. They are |
4aa45c31 | 672 | called forany and forall. |
0ce9abe6 | 673 | |
0e22dfd1 PH |
674 | 13. There's a new global option called dsn_from that can be used to vary the |
675 | contents of From: lines in bounces and other automatically generated | |
676 | messages ("delivery status notifications" - hence the name of the option). | |
0e22dfd1 | 677 | |
4aa45c31 | 678 | 14. The smtp transport has a new option called hosts_avoid_pipelining. |
c51b8e75 | 679 | |
75b1493f | 680 | 15. By default, exigrep does case-insensitive matches. There is now a -I option |
4aa45c31 | 681 | that makes it case-sensitive. |
29f89cad | 682 | |
4aa45c31 PH |
683 | 16. A number of new features ("addresses", "map", "filter", and "reduce") have |
684 | been added to string expansions to make it easier to process lists of | |
685 | items, typically addresses. | |
29f89cad | 686 | |
c3611384 PH |
687 | 17. There's a new ACL modifier called "continue". It does nothing of itself, |
688 | and processing of the ACL always continues with the next condition or | |
689 | modifier. It is provided so that the side effects of expanding its argument | |
4aa45c31 | 690 | can be used. |
c3611384 | 691 | |
ec95d1a6 | 692 | 18. It is now possible to use newline and other control characters (those with |
4aa45c31 | 693 | values less than 32, plus DEL) as separators in lists. |
ec95d1a6 | 694 | |
b2d5182b PH |
695 | 19. The exigrep utility now has a -v option, which inverts the matching |
696 | condition. | |
697 | ||
c456d9bb | 698 | 20. The host_find_failed option in the manualroute router can now be set to |
4aa45c31 | 699 | "ignore". |
c456d9bb | 700 | |
b4ed4da0 PH |
701 | |
702 | Version 4.66 | |
703 | ------------ | |
704 | ||
705 | No new features were added to 4.66. | |
706 | ||
707 | ||
708 | Version 4.65 | |
709 | ------------ | |
710 | ||
711 | No new features were added to 4.65. | |
712 | ||
38a0a95f PH |
713 | |
714 | Version 4.64 | |
715 | ------------ | |
716 | ||
af561417 PH |
717 | 1. ACL variables can now be given arbitrary names, as long as they start with |
718 | "acl_c" or "acl_m" (for connection variables and message variables), are at | |
719 | least six characters long, with the sixth character being either a digit or | |
883335dc | 720 | an underscore. |
af561417 PH |
721 | |
722 | 2. There is a new ACL modifier called log_reject_target. It makes it possible | |
883335dc | 723 | to specify which logs are used for messages about ACL rejections. |
af561417 PH |
724 | |
725 | 3. There is a new authenticator called "dovecot". This is an interface to the | |
726 | authentication facility of the Dovecot POP/IMAP server, which can support a | |
883335dc | 727 | number of authentication methods. |
af561417 PH |
728 | |
729 | 4. The variable $message_headers_raw provides a concatenation of all the | |
730 | messages's headers without any decoding. This is in contrast to | |
731 | $message_headers, which does RFC2047 decoding on the header contents. | |
732 | ||
883335dc PH |
733 | 5. In a DNS black list, if two domain names, comma-separated, are given, the |
734 | second is used first to do an initial check, making use of any IP value | |
735 | restrictions that are set. If there is a match, the first domain is used, | |
736 | without any IP value restrictions, to get the TXT record. | |
af561417 | 737 | |
883335dc | 738 | 6. All authenticators now have a server_condition option. |
af561417 PH |
739 | |
740 | 7. There is a new command-line option called -Mset. It is useful only in | |
741 | conjunction with -be (that is, when testing string expansions). It must be | |
742 | followed by a message id; Exim loads the given message from its spool | |
883335dc | 743 | before doing the expansions. |
af561417 PH |
744 | |
745 | 8. Another similar new command-line option is called -bem. It operates like | |
883335dc PH |
746 | -be except that it must be followed by the name of a file that contains a |
747 | message. | |
af561417 PH |
748 | |
749 | 9. When an address is delayed because of a 4xx response to a RCPT command, it | |
750 | is now the combination of sender and recipient that is delayed in | |
883335dc | 751 | subsequent queue runs until its retry time is reached. |
af561417 PH |
752 | |
753 | 10. Unary negation and the bitwise logical operators and, or, xor, not, and | |
883335dc | 754 | shift, have been added to the eval: and eval10: expansion items. |
48c7f9e2 | 755 | |
194cc0e4 PH |
756 | 11. The variables $interface_address and $interface_port have been renamed |
757 | as $received_ip_address and $received_port, to make it clear that they | |
758 | relate to message reception rather than delivery. (The old names remain | |
759 | available for compatibility.) | |
760 | ||
883335dc PH |
761 | 12. The "message" modifier can now be used on "accept" and "discard" acl verbs |
762 | to vary the message that is sent when an SMTP command is accepted. | |
4e88a19f | 763 | |
495ae4b0 | 764 | |
4608d683 PH |
765 | Version 4.63 |
766 | ------------ | |
767 | ||
768 | 1. There is a new Boolean option called filter_prepend_home for the redirect | |
38a0a95f | 769 | router. |
4608d683 | 770 | |
45b91596 PH |
771 | 2. There is a new acl, set by acl_not_smtp_start, which is run right at the |
772 | start of receiving a non-SMTP message, before any of the message has been | |
38a0a95f | 773 | read. |
45b91596 | 774 | |
a5bd321b PH |
775 | 3. When an SMTP error message is specified in a "message" modifier in an ACL, |
776 | or in a :fail: or :defer: message in a redirect router, Exim now checks the | |
38a0a95f | 777 | start of the message for an SMTP error code. |
a5bd321b | 778 | |
6ec97b1b | 779 | 4. There is a new parameter for LDAP lookups called "referrals", which takes |
38a0a95f | 780 | one of the settings "follow" (the default) or "nofollow". |
6ec97b1b | 781 | |
e22ca4ac JJ |
782 | 5. Version 20070721.2 of exipick now included, offering these new options: |
783 | --reverse | |
784 | After all other sorting options have bee processed, reverse order | |
785 | before displaying messages (-R is synonym). | |
786 | --random | |
787 | Randomize order of matching messages before displaying. | |
788 | --size | |
789 | Instead of displaying the matching messages, display the sum | |
790 | of their sizes. | |
791 | --sort <variable>[,<variable>...] | |
792 | Before displaying matching messages, sort the messages according to | |
793 | each messages value for each variable. | |
794 | --not | |
795 | Negate the value for every test (returns inverse output from the | |
796 | same criteria without --not). | |
797 | ||
4608d683 | 798 | |
1cce3af8 PH |
799 | Version 4.62 |
800 | ------------ | |
801 | ||
802 | 1. The ${readsocket expansion item now supports Internet domain sockets as well | |
803 | as Unix domain sockets. If the first argument begins "inet:", it must be of | |
804 | the form "inet:host:port". The port is mandatory; it may be a number or the | |
805 | name of a TCP port in /etc/services. The host may be a name, or it may be an | |
806 | IP address. An ip address may optionally be enclosed in square brackets. | |
807 | This is best for IPv6 addresses. For example: | |
808 | ||
809 | ${readsocket{inet:[::1]:1234}{<request data>}... | |
810 | ||
811 | Only a single host name may be given, but if looking it up yield more than | |
812 | one IP address, they are each tried in turn until a connection is made. Once | |
813 | a connection has been made, the behaviour is as for ${readsocket with a Unix | |
814 | domain socket. | |
815 | ||
f7fd3850 PH |
816 | 2. If a redirect router sets up file or pipe deliveries for more than one |
817 | incoming address, and the relevant transport has batch_max set greater than | |
818 | one, a batch delivery now occurs. | |
819 | ||
d6629cdc PH |
820 | 3. The appendfile transport has a new option called maildirfolder_create_regex. |
821 | Its value is a regular expression. For a maildir delivery, this is matched | |
822 | against the maildir directory; if it matches, Exim ensures that a | |
823 | maildirfolder file is created alongside the new, cur, and tmp directories. | |
824 | ||
1cce3af8 | 825 | |
7e66e54d PH |
826 | Version 4.61 |
827 | ------------ | |
828 | ||
4f578862 PH |
829 | The documentation is up-to-date for the 4.61 release. Major new features since |
830 | the 4.60 release are: | |
831 | ||
832 | . An option called disable_ipv6, to disable the use of IPv6 completely. | |
833 | ||
834 | . An increase in the number of ACL variables to 20 of each type. | |
835 | ||
836 | . A change to use $auth1, $auth2, and $auth3 in authenticators instead of $1, | |
837 | $2, $3, (though those are still set) because the numeric variables get used | |
838 | for other things in complicated expansions. | |
839 | ||
843a41e8 | 840 | . The default for rfc1413_query_timeout has been changed from 30s to 5s. |
4f578862 PH |
841 | |
842 | . It is possible to use setclassresources() on some BSD OS to control the | |
843 | resources used in pipe deliveries. | |
844 | ||
845 | . A new ACL modifier called add_header, which can be used with any verb. | |
846 | ||
847 | . More errors are detectable in retry rules. | |
848 | ||
849 | There are a number of other additions too. | |
71fafd95 | 850 | |
7e66e54d | 851 | |
425ae40f | 852 | Version 4.60 |
b5aea5e1 PH |
853 | ------------ |
854 | ||
425ae40f PH |
855 | The documentation is up-to-date for the 4.60 release. Major new features since |
856 | the 4.50 release are: | |
1a46a8c5 | 857 | |
425ae40f | 858 | . Support for SQLite. |
1a46a8c5 | 859 | |
425ae40f | 860 | . Support for IGNOREQUOTA in LMTP. |
1a46a8c5 | 861 | |
425ae40f | 862 | . Extensions to the "submission mode" features. |
1a46a8c5 | 863 | |
425ae40f | 864 | . Support for Client SMTP Authorization (CSA). |
1a46a8c5 | 865 | |
425ae40f | 866 | . Support for ratelimiting hosts and users. |
b5aea5e1 | 867 | |
425ae40f | 868 | . New expansion items to help with the BATV "prvs" scheme. |
b5aea5e1 | 869 | |
425ae40f | 870 | . A "match_ip" condition, that matches an IP address against a list. |
35edf2ff | 871 | |
425ae40f | 872 | There are many more minor changes. |
495ae4b0 PH |
873 | |
874 | **** |