TLS fixes for OpenSSL.
[exim.git] / src / README.UPDATING
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1This document contains detailed information about incompatibilities that might
2be encountered when upgrading from one release of Exim to another. The
3information is in reverse order of release numbers. Mostly these are relatively
4small points, and the configuration file is normally upwards compatible, but
5there have been two big upheavals...
6
7
8**************************************************************************
9* There was a big reworking of the way mail routing works for release *
10* 4.00. Previously used "directors" were abolished, and all routing is *
11* now done by routers. Policy controls for incoming mail are now done by *
12* Access Control Lists instead of separate options. All this means that *
13* pre-4.00 configuration files have to be massively converted. If you *
14* are coming from a 3.xx release, please read the document in the file *
15* doc/Exim4.upgrade, and allow some time to complete the upgrade. *
16* *
17* There was a big reworking of the way domain/host/net/address lists are *
18* handled at release 3.00. If you are coming from a pre-3.00 release, it *
19* might be easier to start again from a default configuration. Otherwise *
20* you need to read doc/Exim3.upgrade and do a double conversion of your *
21* configuration file. *
22**************************************************************************
23
24
25The rest of this document contains information about changes in 4.xx releases
26that might affect a running system.
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29Exim version 4.78
30-----------------
31
32 * The value of $tls_peerdn is now print-escaped when written to the spool file
33 in a -tls_peerdn line, and unescaped when read back in. We received reports
34 of values with embedded newlines, which caused spool file corruption.
35
36 If you have a corrupt spool file and you wish to recover the contents after
37 upgrading, then lock the message, replace the new-lines that should be part
38 of the -tls_peerdn line with the two-character sequence \n and then unlock
39 the message. No tool has been provided as we believe this is a rare
40 occurence.
41
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42 * With OpenSSL 1.0.1+, Exim now supports TLS 1.1 and TLS 1.2. If built
43 against 1.0.1a then you will get a warning message and the
44 "openssl_options" value will not parse "no_tlsv1_1": the value changes
45 incompatibly between 1.0.1a and 1.0.1b, because the value chosen for 1.0.1a
46 is infelicitous. We advise avoiding 1.0.1a.
47
48 "openssl_options" gains "no_tlsv1_1", "no_tlsv1_2" and "no_compression".
49
50
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52Exim version 4.77
53-----------------
54
55 * GnuTLS will now attempt to use TLS 1.2 and TLS 1.1 before TLS 1.0 and SSL3,
56 if supported by your GnuTLS library. Use the existing
57 "gnutls_require_protocols" option to downgrade this if that will be a
58 problem. Prior to this release, supported values were "TLS1" and "SSL3",
59 so you should be able to update configuration prior to update.
60
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61 * The match_<type>{string1}{string2} expansion conditions no longer subject
62 string2 to string expansion, unless Exim was built with the new
63 "EXPAND_LISTMATCH_RHS" option. Too many people have inadvertently created
64 insecure configurations that way. If you need the functionality and turn on
65 that build option, please let the developers know, and know why, so we can
66 try to provide a safer mechanism for you.
67
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68 The match{}{} expansion condition (for regular expressions) is NOT affected.
69 For match_<type>{s1}{s2}, all list functionality is unchanged. The only
70 change is that a '$' appearing in s2 will not trigger expansion, but instead
71 will be treated as a literal $ sign; the effect is very similar to having
72 wrapped s2 with \N...\N. If s2 contains a named list and the list definition
73 uses $expansions then those _will_ be processed as normal. It is only the
74 point at which s2 is read where expansion is inhibited.
75
76 If you are trying to test if two email addresses are equal, use eqi{s1}{s2}.
77 If you are testing if the address in s1 occurs in the list of items given
78 in s2, either use the new inlisti{s1}{s2} condition (added in 4.77) or use
79 the pre-existing forany{s2}{eqi{$item}{s1}} condition.
80
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82Exim version 4.74
83-----------------
84
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85 * The integrated support for dynamically loadable lookup modules has an ABI
86 change from the modules supported by some OS vendors through an unofficial
87 patch. Don't try to mix & match.
88
89 * Some parts of the build system are now beginning to assume that the host
90 environment is POSIX. If you're building on a system where POSIX tools are
91 not the default, you might have an easier time if you switch to the POSIX
92 tools. Feel free to report non-POSIX issues as a request for a feature
93 enhancement, but if the POSIX variants are available then the fix will
94 probably just involve some coercion. See the README instructions for
95 building on such hosts.
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96
97
98Exim version 4.73
99-----------------
100
101 * The Exim run-time user can no longer be root; this was always
102 strongly discouraged, but is now prohibited both at build and
103 run-time. If you need Exim to run routinely as root, you'll need to
104 patch the source and accept the risk. Here be dragons.
105
106 * Exim will no longer accept a configuration file owned by the Exim
107 run-time user, unless that account is explicitly the value in
108 CONFIGURE_OWNER, which we discourage. Exim now checks to ensure that
a7ee5955 109 files are not writeable by other accounts.
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110
111 * The ALT_CONFIG_ROOT_ONLY build option is no longer optional and is forced
112 on; the Exim user can, by default, no longer use -C/-D and retain privilege.
113 Two new build options mitigate this.
114
115 * TRUSTED_CONFIG_LIST defines a file containing a whitelist of config
116 files that are trusted to be selected by the Exim user; one per line.
117 This is the recommended approach going forward.
118
119 * WHITELIST_D_MACROS defines a colon-separated list of macro names which
120 the Exim run-time user may safely pass without dropping privileges.
121 Because changes to this involve a recompile, this is not the recommended
122 approach but may ease transition. The values of the macros, when
43236f35 123 overridden, are constrained to match this regex: ^[A-Za-z0-9_/.-]*$
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124
125 * The system_filter_user option now defaults to the Exim run-time user,
126 rather than root. You can still set it explicitly to root and this
127 can be done with prior versions too, letting you roll versions
128 without needing to change this configuration option.
129
130 * ClamAV must be at least version 0.95 unless WITH_OLD_CLAMAV_STREAM is
131 defined at build time.
132
133
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134Exim version 4.70
135-----------------
136
1371. Experimental Yahoo! Domainkeys support has been dropped in this release.
138It has been superceded by a native implementation of its successor DKIM.
139
1402. Up to version 4.69, Exim came with an embedded version of the PCRE library.
141As of 4.70, this is no longer the case. To compile Exim, you will need PCRE
a7ee5955 142installed. Most OS distributions have ready-made library and development
2eda48c6 143packages.
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144
145
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146Exim version 4.68
147-----------------
148
1491. The internal implementation of the database keys that are used for ACL
150ratelimiting has been tidied up. This means that an update to 4.68 might cause
151Exim to "forget" previous rates that it had calculated, and reset them to zero.
152
153
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154Exim version 4.64
155-----------------
156
1571. Callouts were setting the name used for EHLO/HELO from $smtp_active_
158hostname. This is wrong, because it relates to the incoming message (and
159probably the interface on which it is arriving) and not to the outgoing
160callout (which could be using a different interface). This has been
161changed to use the value of the helo_data option from the smtp transport
162instead - this is what is used when a message is actually being sent. If
163there is no remote transport (possible with a router that sets up host
164addresses), $smtp_active_hostname is used. This change is mentioned here in
165case somebody is relying on the use of $smtp_active_hostname.
166
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1672. A bug has been fixed that might just possibly be something that is relied on
168in some configurations. In expansion items such as ${if >{xxx}{yyy}...} an
169empty string (that is {}) was being interpreted as if it was {0} and therefore
170treated as the number zero. From release 4.64, such strings cause an error
171because a decimal number, possibly followed by K or M, is required (as has
172always been documented).
173
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1743. There has been a change to the GnuTLS support (ChangeLog/PH/20) to improve
175Exim's performance. Unfortunately, this has the side effect of being slightly
176non-upwards compatible for versions 4.50 and earlier. If you are upgrading from
177one of these earlier versions and you use GnuTLS, you must remove the file
178called gnutls-params in Exim's spool directory. If you don't do this, you will
179see this error:
180
181 TLS error on connection from ... (DH params import): Base64 decoding error.
182
183Removing the file causes Exim to recompute the relevant encryption parameters
184and cache them in the new format that was introduced for release 4.51 (May
1852005). If you are upgrading from release 4.51 or later, there should be no
186problem.
187
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189Exim version 4.63
190-----------------
191
192When an SMTP error message is specified in a "message" modifier in an ACL, or
193in a :fail: or :defer: message in a redirect router, Exim now checks the start
194of the message for an SMTP error code. This consists of three digits followed
195by a space, optionally followed by an extended code of the form n.n.n, also
196followed by a space. If this is the case and the very first digit is the same
197as the default error code, the code from the message is used instead. If the
198very first digit is incorrect, a panic error is logged, and the default code is
199used. This is an incompatible change, but it is not expected to affect many (if
200any) configurations. It is possible to suppress the use of the supplied code in
201a redirect router by setting the smtp_error_code option false. In this case,
202any SMTP code is quietly ignored.
203
204
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205Exim version 4.61
206-----------------
207
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2081. The default number of ACL variables of each type has been increased to 20,
209and it's possible to compile Exim with more. You can safely upgrade to this
210release if you already have messages on the queue with saved ACL variable
211values. However, if you downgrade from this release with messages on the queue,
212any saved ACL values they may have will be lost.
213
2142. The default value for rfc1413_query_timeout has been changed from 30s to 5s.
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215
216
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217Exim version 4.54
218-----------------
219
220There was a problem with 4.52/TF/02 in that a "name=" option on control=
221submission terminated at the next slash, thereby not allowing for slashes in
222the name. This has been changed so that "name=" takes the rest of the string as
223its data. It must therefore be the last option.
224
225
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226Version 4.53
227------------
228
229If you are using the experimental Domain Keys support, you must upgrade to
230at least libdomainkeys 0.67 in order to run this release of Exim.
231
232
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233Version 4.51
234------------
235
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2361. The format in which GnuTLS parameters are cached (in the file gnutls-params
237in the spool directory) has been changed. The new format can also be generated
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238externally, so it is now possible to update the values from outside Exim. This
239has been implemented in an upwards, BUT NOT downwards, compatible manner.
240Upgrading should be seamless: when Exim finds that it cannot understand an
241existing cache file, it generates new parameters and writes them to the cache
242in the new format. If, however, you downgrade from 4.51 to a previous release,
243you MUST delete the gnutls-params file in the spool directory, because the
244older Exim will not recognize the new format.
245
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2462. When doing a callout as part of verifying an address, Exim was not paying
247attention to any local part prefix or suffix that was matched by the router
248that accepted the address. It now behaves in the same way as it does for
249delivery: the affixes are removed from the local part unless
250rcpt_include_affixes is set on the transport. If you have a configuration that
251uses prefixes or suffixes on addresses that could be used for callouts, and you
252want the affixes to be retained, you must make sure that rcpt_include_affixes
253is set on the transport.
254
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2553. Bounce and delay warning messages no longer contain details of delivery
256errors, except for explicit messages (e.g. generated by :fail:) and SMTP
257responses from remote hosts.
258
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260Version 4.50
261------------
262
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263The exicyclog script has been updated to use three-digit numbers in rotated log
264files if the maximum number to keep is greater than 99. If you are already
265keeping more than 99, there will be an incompatible change when you upgrade.
266You will probably want to rename your old log files to the new form before
c3af992c 267running the new exicyclog.
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268
269
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270Version 4.42
271------------
272
273RFC 3848 specifies standard names for the "with" phrase in Received: header
274lines when AUTH and/or TLS are in use. This is the "received protocol"
275field. Exim used to use "asmtp" for authenticated SMTP, without any
276indication (in the protocol name) for TLS use. Now it follows the RFC and
277uses "esmtpa" if the connection is authenticated, "esmtps" if it is
278encrypted, and "esmtpsa" if it is both encrypted and authenticated. These names
279appear in log lines as well as in Received: header lines.
280
281
282Version 4.34
283------------
284
285Change 4.31/2 gave problems to data ACLs and local_scan() functions that
286expected to see a Received: header. I have changed to yet another scheme. The
287Received: header is now generated after the body is received, but before the
288ACL or local_scan() is called. After they have run, the timestamp in the
289Received: header is updated.
290
291Thus, change (a) of 4.31/2 has been reversed, but change (b) is still true,
292which is lucky, since I decided it was a bug fix.
293
294
295Version 4.33
296------------
297
298If an expansion in a condition on a "warn" statement fails because a lookup
299defers, the "warn" statement is abandoned, and the next ACL statement is
300processed. Previously this caused the whole ACL to be aborted.
301
302
303Version 4.32
304------------
305
306Change 4.31/2 has been reversed, as it proved contentious. Recipient callout
307verification now uses <> in the MAIL command by default, as it did before. A
308new callout option, "use_sender", has been added to request the other
309behaviour.
310
311
312Version 4.31
313------------
314
3151. If you compile Exim to use GnuTLS, it now requires the use of release 1.0.0
316 or greater. The interface to the obsolete 0.8.x releases is no longer
317 supported. There is one externally visible change: the format for the
318 display of Distinguished Names now uses commas as a separator rather than a
319 slash. This is to comply with RFC 2253.
320
3212. When a message is received, the Received: header line is now generated when
322 reception is complete, instead of at the start of reception. For messages
323 that take a long time to come in, this changes the meaning of the timestamp.
324 There are several side-effects of this change:
325
326 (a) If a message is rejected by a DATA or non-SMTP ACL, or by local_scan(),
327 the logged header lines no longer include the local Received: line,
328 because it has not yet been created. If the message is a non-SMTP one,
329 and the error is processed by sending a message to the sender, the copy
330 of the original message that is returned does not have an added
331 Received: line.
332
333 (b) When a filter file is tested using -bf, no additional Received: header
334 is added to the test message. After some thought, I decided that this
335 is a bug fix.
336
337 The contents of $received_for are not affected by this change. This
338 variable still contains the single recipient of a message, copied after
339 addresses have been rewritten, but before local_scan() is run.
340
3412. Recipient callout verification, like sender verification, was using <> in
342 the MAIL FROM command. This isn't really the right thing, since the actual
343 sender may affect whether the remote host accepts the recipient or not. I
344 have changed it to use the actual sender in the callout; this means that
345 the cache record is now keyed on a recipient/sender pair, not just the
346 recipient address. There doesn't seem to be a real danger of callout loops,
347 since a callout by the remote host to check the sender would use <>.
348
349
350Version 4.30
351------------
352
3531. I have abolished timeout_DNS as an error that can be detected in retry
354 rules, because it has never worked. Despite the fact that it has been
355 documented since at least release 1.62, there was no code to support it.
356 If you have used it in your retry rules, you will now get a warning message
357 to the log and panic log. It is now treated as plain "timeout".
358
3592. After discussion on the mailing list, Exim no longer adds From:, Date:, or
360 Message-Id: header lines to messages that do not originate locally, that is,
361 messages that have an associated sending host address.
362
3633. When looking up a host name from an IP address, Exim now tries the DNS
364 first, and only if that fails does it use gethostbyaddr() (or equivalent).
365 This change was made because on some OS, not all the names are given for
366 addresses with multiple PTR records via the gethostbyaddr() interface. The
367 order of lookup can be changed by setting host_lookup_order.
368
369
370Version 4.23
371------------
372
3731. The new FIXED_NEVER_USERS build-time option creates a list of "never users"
374 that cannot be overridden. The default in the distributed EDITME is "root".
375 If for some reason you were (against advice) running deliveries as root, you
376 will have to ensure that FIXED_NEVER_USERS is not set in your
377 Local/Makefile.
378
3792. The ${quote: operator now quotes an empty string, which it did not before.
380
3813. Version 4.23 saves the contents of the ACL variables with the message, so
382 that they can be used later. If one of these variables contains a newline,
383 there will be a newline character in the spool that will not be interpreted
384 correctely by a previous version of Exim. (Exim ignores keyed spool file
385 items that it doesn't understand - precisely for this kind of problem - but
386 it expects them all to be on one line.)
387
388 So the bottom line is: if you have newlines in your ACL variables, you
389 cannot retreat from 4.23.
390
391
392Version 4.21
393------------
394
3951. The idea of the "warn" ACL verb is that it adds a header or writes to the
396 log only when "message" or "log_message" are set. However, if one of the
397 conditions was an address verification, or a call to a nested ACL, the
398 messages generated by the underlying test were being passed through. This
399 no longer happens. The underlying message is available in $acl_verify_
400 message for both "message" and "log_message" expansions, so it can be
401 passed through if needed.
402
4032. The way that the $h_ (and $header_) expansions work has been changed by the
404 addition of RFC 2047 decoding. See the main documentation (the NewStuff file
405 until release 4.30, then the manual) for full details. Briefly, there are
406 now three forms:
407
408 $rh_xxx: and $rheader_xxx: give the original content of the header
409 line(s), with no processing at all.
410
411 $bh_xxx: and $bheader_xxx: remove leading and trailing white space, and
412 then decode base64 or quoted-printable "words" within the header text,
413 but do not do charset translation.
414
415 $h_xxx: and $header_xxx: attempt to translate the $bh_ string to a
416 standard character set.
417
418 If you have previously been using $h_ expansions to access the raw
419 characters, you should change to $rh_ instead.
420
4213. When Exim creates an RFC 2047 encoded word in a header line, it labels it
422 with the default character set from the headers_charset option instead of
423 always using iso-8859-1.
424
4254. If TMPDIR is defined in Local/Makefile (default in src/EDITME is
426 TMPDIR="/tmp"), Exim checks for the presence of an environment variable
427 called TMPDIR, and if it finds it is different, it changes its value.
428
4295. Following a discussion on the list, the rules by which Exim recognises line
430 endings on incoming messages have been changed. The -dropcr and drop_cr
431 options are now no-ops, retained only for backwards compatibility. The
432 following line terminators are recognized: LF CRLF CR. However, special
433 processing applies to CR:
434
435 (i) The sequence CR . CR does *not* terminate an incoming SMTP message,
436 nor a local message in the state where . is a terminator.
437
438 (ii) If a bare CR is encountered in a header line, an extra space is added
439 after the line terminator so as not to end the header. The reasoning
440 behind this is that bare CRs in header lines are most likely either
441 to be mistakes, or people trying to play silly games.
442
4436. The code for using daemon_smtp_port, local_interfaces, and the -oX options
444 has been reorganized. It is supposed to be backwards compatible, but it is
445 mentioned here just in case I've screwed up.
446
447
448
449Version 4.20
450------------
451
4521. I have tidied and re-organized the code that uses alarm() for imposing time
453 limits on various things. It shouldn't affect anything, but if you notice
454 processes getting stuck, it may be that I've broken something.
455
4562. The "arguments" log selector now also logs the current working directory
457 when Exim is called.
458
4593. An incompatible change has been made to the appendfile transport. This
460 affects the case when it is used for file deliveries that are set up by
461 .forward and filter files. Previously, any settings of the "file" or
462 "directory" options were ignored. It is hoped that, like the address_file
463 transport in the default configuration, these options were never in fact set
464 on such transports, because they were of no use.
465
466 Now, if either of these options is set, it is used. The path that is passed
467 by the router is in $address_file (this is not new), so it can be used as
468 part of a longer path, or modified in any other way that expansion permits.
469
470 If neither "file" nor "directory" is set, the behaviour is unchanged.
471
4724. Related to the above: in a filter, if a "save" command specifies a non-
473 absolute path, the value of $home/ is pre-pended. This no longer happens if
474 $home is unset or is set to an empty string.
475
4765. Multiple file deliveries from a filter or .forward file can never be
477 batched; the value of batch_max on the transport is ignored for file
478 deliveries. I'm assuming that nobody ever actually set batch_max on the
479 address_file transport - it would have had odd effects previously.
480
4816. DESTDIR is the more common variable that ROOT for use when installing
482 software under a different root filing system. The Exim install script now
483 recognizes DESTDIR first; if it is not set, ROOT is used.
484
4857. If DESTDIR is set when installing Exim, it no longer prepends its value to
486 the path of the system aliases file that appears in the default
487 configuration (when a default configuration is installed). If an aliases
488 file is actually created, its name *does* use the prefix.
489
490
491Version 4.14
492------------
493
4941. The default for the maximum number of unknown SMTP commands that Exim will
495accept before dropping a connection has been reduced from 5 to 3. However, you
496can now change the value by setting smtp_max_unknown_commands.
497
4982. The ${quote: operator has been changed so that it turns newline and carriage
499return characters into \n and \r, respectively.
500
5013. The file names used for maildir messages now include the microsecond time
502fraction as well as the time in seconds, to cope with systems where the process
503id can be re-used within the same second. The format is now
504
505 <time>.H<microsec>P<pid>.<host>
506
507This should be a compatible change, but is noted here just in case.
508
5094. The rules for creating message ids have changed, to cope with systems where
510the process id can be re-used within the same second. The format, however, is
511unchanged, so this should not cause any problems, except as noted in the next
512item.
513
5145. The maximum value for localhost_number has been reduced from 255 to 16, in
515order to implement the new message id rules. For operating systems that have
516case-insensitive file systems (Cygwin and Darwin), the limit is 10.
517
5186. verify = header_syntax was allowing unqualified addresses in all cases. Now
519it allows them only for locally generated messages and from hosts that match
520sender_unqualified_hosts or recipient_unqualified_hosts, respectively.
521
5227. For reasons lost in the mists of time, when a pipe transport was run, the
523environment variable MESSAGE_ID was set to the message ID preceded by 'E' (the
524form used in Message-ID: header lines). The 'E' has been removed.
525
526
527Version 4.11
528------------
529
5301. The handling of lines in the configuration file has changed. Previously,
531macro expansion was applied to logical lines, after continuations had been
532joined on. This meant that it could not be used in .include lines, which are
533handled as physical rather than logical lines. Macro expansion is now done on
534physical lines rather than logical lines. This means there are two
535incompatibilities:
536
537 (a) A macro that expands to # to turn a line into a comment now applies only
538 to the physical line where it appears. Previously, it would have caused
539 any following continuations also to be ignored.
540
541 (b) A macro name can no longer be split over the boundary between a line and
542 its continuation. Actually, this is more of a bug fix. :-)
543
5442. The -D command line option must now all be within one command line item.
545This makes it possible to use -D to set a macro to the empty string by commands
546such as
547
548 exim -DABC ...
549 exim -DABC= ...
550
551Previously, these items would have moved on to the next item on the command
552line. To include spaces in a macro definition item, quotes must be used, in
553which case you can also have spaces after -D and surrounding the equals. For
554example:
555
556 exim '-D ABC = something' ...
557
5583. The way that addresses that redirect to themselves are handled has been
559changed, in order to fix an obscure bug. This should not cause any problems
560except in the case of wanting to go back from a 4.11 (or later) release to an
561earlier release. If there are undelivered messages on the spool that contain
562addresses which redirect to themselves, and the redirected addresses have
563already been delivered, you might get a duplicate delivery if you revert to an
564earlier Exim.
565
5664. The default way of looking up IP addresses for hosts in the manualroute and
567queryprogram routers has been changed. If "byname" or "bydns" is explicitly
568specified, there is no change, but if no method is specified, Exim now behaves
569as follows:
570
571 First, a DNS lookup is done. If this yields anything other than
572 HOST_NOT_FOUND, that result is used. Otherwise, Exim goes on to try a call to
573 getipnodebyname() (or gethostbyname() on older systems) and the result of the
574 lookup is the result of that call.
575
576This change has been made because it has been discovered that on some systems,
577if a DNS lookup called via getipnodebyname() times out, HOST_NOT_FOUND is
578returned instead of TRY_AGAIN. Thus, it is safest to try a DNS lookup directly
579first, and only if that gives a definite "no such host" to try the local
580function.
581
5825. In fixing the minor security problem with pid_file_path, I have removed some
583backwards-compatible (undocumented) code which was present to ease conversion
584from Exim 3. In Exim 4, pid_file_path is a literal; in Exim 3 it was allowed to
585contain "%s", which was replaced by the port number for daemons listening on
586non-standard ports. In Exim 4, such daemons do not write a pid file. The
587backwards compatibility feature was to replace "%s" by nothing if it occurred
588in an Exim 4 setting of pid_file_path. The bug was in this code. I have solved
589the problem by removing the backwards compatibility feature. Thus, if you still
590have "%s" somewhere in a setting of pid_file_path, you should remove it.
591
5926. There has been an extension to lsearch files. The keys in these files may
593now be quoted in order to allow for whitespace and colons in them. This means
594that if you were previously using keys that began with a doublequote, you will
595now have to wrap them with extra quotes and escape the internal quotes. The
596possibility that anybody is actually doing this seems extremely remote, but it
597is documented just in case.
598
599
600Version 4.10
601------------
602
603The build-time parameter EXIWHAT_KILL_ARG has been renamed EXIWHAT_KILL_SIGNAL
604to better reflect its function. The OS-specific files have been updated. Only
605if you have explicitly set this in your Makefile (highly unlikely) do you need
606to change anything.
607
608****