Change log file for Exim from version 4.21
--------------------------------------------
+------------------------------------------
+This document describes *changes* to previous versions, that might
+affect Exim's operation, with an unchanged configuration file. For new
+options, and new features, see the NewStuff file next to this ChangeLog.
+
+
+Exim version 4.92
+-----------------
+
+JH/01 Remove code calling the customisable local_scan function, unless a new
+ definition "HAVE_LOCAL_SCAN=yes" is present in the Local/Makefile.
+
+JH/02 Bug 1007: Avoid doing logging from signal-handlers, as that can result in
+ non-signal-safe functions being used.
+
+JH/03 Bug 2269: When presented with a received message having a stupidly large
+ number of DKIM-Signature headers, disable DKIM verification to avoid
+ a resource-consumption attack. The limit is set at twenty.
+
+JH/04 Add variables $arc_domains, $arc_oldest_pass for ARC verify. Fix the
+ report of oldest_pass in ${authres } in consequence, and separate out
+ some descriptions of reasons for verification fail.
+
+JH/05 Bug 2273: Cutthrough delivery left a window where the received messsage
+ files in the spool were present and unlocked. A queue-runner could spot
+ them, resulting in a duplicate delivery. Fix that by doing the unlock
+ after the unlink. Investigation by Tim Stewart. Take the opportunity to
+ add more error-checking on spoolfile handling while that code is being
+ messed with.
+
+PP/01 Refuse to open a spool data file (*-D) if it's a symlink.
+ No known attacks, no CVE, this is defensive hardening.
+
+JH/06 Bug 2275: The MIME ACL unlocked the received message files early, and
+ a queue-runner could start a delivery while other operations were ongoing.
+ Cutthrough delivery was a common victim, resulting in duplicate delivery.
+ Found and investigated by Tim Stewart. Fix by using the open message data
+ file handle rather than opening another, and not locally closing it (which
+ releases a lock) for that case, while creating the temporary .eml format
+ file for the MIME ACL. Also applies to "regex" and "spam" ACL conditions.
+
+JH/07 Bug 177: Make a random-recipient callout success visible in ACL, by setting
+ $sender_verify_failure/$recipient_verify_failure to "random".
+
+JH/08 When generating a selfsigned cert, use serial number 1 since zero is not
+ legitimate.
+
+JH/09 Bug 2274: Fix logging of cmdline args when starting in an unlinked cwd.
+ Previously this would segfault.
+
+JH/10 Fix ARC signing for case when DKIM signing failed. Previously this would
+ segfault.
+
+JH/11 Bug 2264: Exim now only follows CNAME chains one step by default. We'd
+ like zero, since the resolver should be doing this for us, But we need one
+ as a CNAME but no MX presence gets the CNAME returned; we need to check
+ that doesn't point to an MX to declare it "no MX returned" rather than
+ "error, loop". A new main option is added so the older capability of
+ following some limited number of chain links is maintained.
+
+JH/12 Add client-ip info to non-pass iprev ${authres } lines.
+
+JH/13 For receent Openssl versions (1.1 onward) use modern generic protocol
+ methods. These should support TLS 1.3; they arrived with TLS 1.3 and the
+ now-deprecated earlier definitions used only specified the range up to TLS
+ 1.2 (in the older-version library docs).
+
+
+Exim version 4.91
+-----------------
+
+GF/01 DEFER rather than ERROR on redis cluster MOVED response.
+ When redis_servers is set to a list of > 1 element, and the Redis servers
+ in that list are in cluster configuration, convert the REDIS_REPLY_ERROR
+ case of MOVED into a DEFER case instead, thus moving the query onto the
+ next server in the list. For a cluster of N elements, all N servers must
+ be defined in redis_servers.
+
+GF/02 Catch and remove uninitialized value warning in exiqsumm
+ Check for existence of @ARGV before looking at $ARGV[0]
+
+JH/01 Replace the store_release() internal interface with store_newblock(),
+ which internalises the check required to safely use the old one, plus
+ the allocate and data copy operations duplicated in both (!) of the
+ extant use locations.
+
+JH/02 Disallow '/' characters in queue names specified for the "queue=" ACL
+ modifier. This matches the restriction on the commandline.
+
+JH/03 Fix pgsql lookup for multiple result-tuples with a single column.
+ Previously only the last row was returned.
+
+JH/04 Bug 2217: Tighten up the parsing of DKIM signature headers. Previously
+ we assumed that tags in the header were well-formed, and parsed the
+ element content after inspecting only the first char of the tag.
+ Assumptions at that stage could crash the receive process on malformed
+ input.
+
+JH/05 Bug 2215: Fix crash associated with dnsdb lookup done from DKIM ACL.
+ While running the DKIM ACL we operate on the Permanent memory pool so that
+ variables created with "set" persist to the DATA ACL. Also (at any time)
+ DNS lookups that fail create cache records using the Permanent pool. But
+ expansions release any allocations made on the current pool - so a dnsdb
+ lookup expansion done in the DKIM ACL releases the memory used for the
+ DNS negative-cache, and bad things result. Solution is to switch to the
+ Main pool for expansions.
+ While we're in that code, add checks on the DNS cache during store_reset,
+ active in the testsuite.
+ Problem spotted, and debugging aided, by Wolfgang Breyha.
+
+JH/06 Fix issue with continued-connections when the DNS shifts unreliably.
+ When none of the hosts presented to a transport match an already-open
+ connection, close it and proceed with the list. Previously we would
+ queue the message. Spotted by Lena with Yahoo, probably involving
+ round-robin DNS.
+
+JH/07 Bug 2214: Fix SMTP responses resulting from non-accept result of MIME ACL.
+ Previously a spurious "250 OK id=" response was appended to the proper
+ failure response.
+
+JH/08 The "support for" informational output now, which built with Content
+ Scanning support, has a line for the malware scanner interfaces compiled
+ in. Interface can be individually included or not at build time.
+
+JH/09 The "aveserver", "kavdaemon" and "mksd" interfaces are now not included
+ by the template makefile "src/EDITME". The "STREAM" support for an older
+ ClamAV interface method is removed.
+
+JH/10 Bug 2223: Fix mysql lookup returns for the no-data case (when the number of
+ rows affected is given instead).
+
+JH/11 The runtime Berkeley DB library version is now additionally output by
+ "exim -d -bV". Previously only the compile-time version was shown.
+
+JH/12 Bug 2230: Fix cutthrough routing for nonfirst messages in an initiating
+ SMTP connection. Previously, when one had more receipients than the
+ first, an abortive onward connection was made. Move to full support for
+ multiple onward connections in sequence, handling cutthrough connection
+ for all multi-message initiating connections.
+
+JH/13 Bug 2229: Fix cutthrough routing for nonstandard port numbers defined by
+ routers. Previously, a multi-recipient message would fail to match the
+ onward-connection opened for the first recipient, and cause its closure.
+
+JH/14 Bug 2174: A timeout on connect for a callout was also erroneously seen as
+ a timeout on read on a GnuTLS initiating connection, resulting in the
+ initiating connection being dropped. This mattered most when the callout
+ was marked defer_ok. Fix to keep the two timeout-detection methods
+ separate.
+
+JH/15 Relax results from ACL control request to enable cutthrough, in
+ unsupported situations, from error to silently (except under debug)
+ ignoring. This covers use with PRDR, frozen messages, queue-only and
+ fake-reject.
+
+HS/01 Fix Buffer overflow in base64d() (CVE-2018-6789)
+
+JH/16 Fix bug in DKIM verify: a buffer overflow could corrupt the malloc
+ metadata, resulting in a crash in free().
+
+PP/01 Fix broken Heimdal GSSAPI authenticator integration.
+ Broken in f2ed27cf5, missing an equals sign for specified-initialisers.
+ Broken also in d185889f4, with init system revamp.
+
+JH/17 Bug 2113: Fix conversation closedown with the Avast malware scanner.
+ Previously we abruptly closed the connection after reading a malware-
+ found indication; now we go on to read the "scan ok" response line,
+ and send a quit.
+
+JH/18 Bug 2239: Enforce non-usability of control=utf8_downconvert in the mail
+ ACL. Previously, a crash would result.
+
+JH/19 Speed up macro lookups during configuration file read, by skipping non-
+ macro text after a replacement (previously it was only once per line) and
+ by skipping builtin macros when searching for an uppercase lead character.
+
+JH/20 DANE support moved from Experimental to mainline. The Makefile control
+ for the build is renamed.
+
+JH/21 Fix memory leak during multi-message connections using STARTTLS. A buffer
+ was allocated for every new TLS startup, meaning one per message. Fix
+ by only allocating once (OpenSSL) or freeing on TLS-close (GnuTLS).
+
+JH/22 Bug 2236: When a DKIM verification result is overridden by ACL, DMARC
+ reported the original. Fix to report (as far as possible) the ACL
+ result replacing the original.
+
+JH/23 Fix memory leak during multi-message connections using STARTTLS under
+ OpenSSL. Certificate information is loaded for every new TLS startup,
+ and the resources needed to be freed.
+
+JH/24 Bug 2242: Fix exim_dbmbuild to permit directoryless filenames.
+
+JH/25 Fix utf8_downconvert propagation through a redirect router. Previously it
+ was not propagated.
+
+JH/26 Bug 2253: For logging delivery lines under PRDR, append the overall
+ DATA response info to the (existing) per-recipient response info for
+ the "C=" log element. It can have useful tracking info from the
+ destination system. Patch from Simon Arlott.
+
+JH/27 Bug 2251: Fix ldap lookups that return a single attribute having zero-
+ length value. Previously this would segfault.
+
+HS/02 Support Avast multiline protoocol, this allows passing flags to
+ newer versions of the scanner.
+
+JH/28 Ensure that variables possibly set during message acceptance are marked
+ dead before release of memory in the daemon loop. This stops complaints
+ about them when the debug_store option is enabled. Discovered specifically
+ for sender_rate_period, but applies to a whole set of variables.
+ Do the same for the queue-runner and queue-list loops, for variables set
+ from spool message files. Do the same for the SMTP per-message loop, for
+ certain variables indirectly set in ACL operations.
+
+JH/29 Bug 2250: Fix a longstanding bug in heavily-pipelined SMTP input (such
+ as a multi-recipient message from a mailinglist manager). The coding had
+ an arbitrary cutoff number of characters while checking for more input;
+ enforced by writing a NUL into the buffer. This corrupted long / fast
+ input. The problem was exposed more widely when more pipelineing of SMTP
+ responses was introduced, and one Exim system was feeding another.
+ The symptom is log complaints of SMTP syntax error (NUL chars) on the
+ receiving system, and refused recipients seen by the sending system
+ (propating to people being dropped from mailing lists).
+ Discovered and pinpointed by David Carter.
+
+JH/30 The (EXPERIMENTAL_DMARC) variable $dmarc_ar_header is withdrawn, being
+ replaced by the ${authresults } expansion.
+
+JH/31 Bug 2257: Fix pipe transport to not use a socket-only syscall.
+
+HS/03 Set a handler for SIGTERM and call exit(3) if running as PID 1. This
+ allows proper process termination in container environments.
+
+JH/32 Bug 2258: Fix spool_wireformat in combination with LMTP transport.
+ Previously the "final dot" had a newline after it; ensure it is CR,LF.
+
+JH/33 SPF: remove support for the "spf" ACL condition outcome values "err_temp"
+ and "err_perm", deprecated since 4.83 when the RFC-defined words
+ "temperror" and "permerror" were introduced.
+
+JH/34 Re-introduce enforcement of no cutthrough delivery on transports having
+ transport-filters or DKIM-signing. The restriction was lost in the
+ consolidation of verify-callout and delivery SMTP handling.
+ Extend the restriction to also cover ARC-signing.
+
+JH/35 Cutthrough: for a final-dot response timeout (and nonunderstood responses)
+ in defer=pass mode supply a 450 to the initiator. Previously the message
+ would be spooled.
+
+PP/02 DANE: add dane_require_tls_ciphers SMTP Transport option; if unset,
+ tls_require_ciphers is used as before.
+
+HS/03 Malware Avast: Better match the Avast multiline protocol. Add
+ "pass_unscanned". Only tmpfails from the scanner are written to
+ the paniclog, as they may require admin intervention (permission
+ denied, license issues). Other scanner errors (like decompression
+ bombs) do not cause a paniclog entry.
+
+JH/36 Fix reinitialisation of DKIM logging variable between messages.
+ Previously it was possible to log spurious information in receive log
+ lines.
+
+JH/37 Bug 2255: Revert the disable of the OpenSSL session caching. This
+ triggered odd behaviour from Outlook Express clients.
+
+PP/03 Add util/renew-opendmarc-tlds.sh script for safe renewal of public
+ suffix list.
+
+JH/38 DKIM: accept Ed25519 pubkeys in SubjectPublicKeyInfo-wrapped form,
+ since the IETF WG has not yet settled on that versus the original
+ "bare" representation.
+
+JH/39 Fix syslog logging for syslog_timestamp=no and log_selector +millisec.
+ Previously the millisecond value corrupted the output.
+ Fix also for syslog_pid=no and log_selector +pid, for which the pid
+ corrupted the output.
+
+
+Exim version 4.90
+-----------------
+
+JH/01 Rework error string handling in TLS interface so that the caller in
+ more cases is responsible for logging. This permits library-sourced
+ string to be attached to addresses during delivery, and collapses
+ pairs of long lines into single ones.
+
+PP/01 Allow PKG_CONFIG_PATH to be set in Local/Makefile and use it correctly
+ during configuration. Wildcards are allowed and expanded.
+
+JH/02 Rework error string handling in DKIM to pass more info back to callers.
+ This permits better logging.
+
+JH/03 Rework the transport continued-connection mechanism: when TLS is active,
+ do not close it down and have the child transport start it up again on
+ the passed-on TCP connection. Instead, proxy the child (and any
+ subsequent ones) for TLS via a unix-domain socket channel. Logging is
+ affected: the continued delivery log lines do not have any DNSSEC, TLS
+ Certificate or OCSP information. TLS cipher information is still logged.
+
+JH/04 Shorten the log line for daemon startup by collapsing adjacent sets of
+ identical IP addresses on different listening ports. Will also affect
+ "exiwhat" output.
+
+PP/02 Bug 2070: uClibc defines __GLIBC__ without providing glibc headers;
+ add noisy ifdef guards to special-case this sillyness.
+ Patch from Bernd Kuhls.
+
+JH/05 Tighten up the checking in isip4 (et al): dotted-quad components larger
+ than 255 are no longer allowed.
+
+JH/06 Default openssl_options to include +no_ticket, to reduce load on peers.
+ Disable the session-cache too, which might reduce our load. Since we
+ currrectly use a new context for every connection, both as server and
+ client, there is no benefit for these.
+ GnuTLS appears to not support tickets server-side by default (we don't
+ call gnutls_session_ticket_enable_server()) but client side is enabled
+ by default on recent versions (3.1.3 +) unless the PFS priority string
+ is used (3.2.4 +).
+
+PP/03 Add $SOURCE_DATE_EPOCH support for reproducible builds, per spec at
+ <https://reproducible-builds.org/specs/source-date-epoch/>.
+
+JH/07 Fix smtp transport use of limited max_rcpt under mua_wrapper. Previously
+ the check for any unsuccessful recipients did not notice the limit, and
+ erroneously found still-pending ones.
+
+JH/08 Pipeline CHUNKING command and data together, on kernels that support
+ MSG_MORE. Only in-clear (not on TLS connections).
+
+JH/09 Avoid using a temporary file during transport using dkim. Unless a
+ transport-filter is involved we can buffer the headers in memory for
+ creating the signature, and read the spool data file once for the
+ signature and again for transmission.
+
+JH/10 Enable use of sendfile in Linux builds as default. It was disabled in
+ 4.77 as the kernel support then wasn't solid, having issues in 64bit
+ mode. Now, it's been long enough. Add support for FreeBSD also.
+
+JH/11 Bug 2104: Fix continued use of a transport connection with TLS. In the
+ case where the routing stage had gathered several addresses to send to
+ a host before calling the transport for the first, we previously failed
+ to close down TLS in the old transport process before passing the TCP
+ connection to the new process. The new one sent a STARTTLS command
+ which naturally failed, giving a failed delivery and bloating the retry
+ database. Investigation and fix prototype from Wolfgang Breyha.
+
+JH/12 Fix check on SMTP command input synchronisation. Previously there were
+ false-negatives in the check that the sender had not preempted a response
+ or prompt from Exim (running as a server), due to that code's lack of
+ awareness of the SMTP input buffering.
+
+PP/04 Add commandline_checks_require_admin option.
+ Exim drops privileges sanely, various checks such as -be aren't a
+ security problem, as long as you trust local users with access to their
+ own account. When invoked by services which pass untrusted data to
+ Exim, this might be an issue. Set this option in main configuration
+ AND make fixes to the calling application, such as using `--` to stop
+ processing options.
+
+JH/13 Do pipelining under TLS. Previously, although safe, no advantage was
+ taken. Now take care to pack both (client) MAIL,RCPT,DATA, and (server)
+ responses to those, into a single TLS record each way (this usually means
+ a single packet). As a side issue, smtp_enforce_sync now works on TLS
+ connections.
+
+PP/05 OpenSSL/1.1: use DH_bits() for more accurate DH param sizes. This
+ affects you only if you're dancing at the edge of the param size limits.
+ If you are, and this message makes sense to you, then: raise the
+ configured limit or use OpenSSL 1.1. Nothing we can do for older
+ versions.
+
+JH/14 For the "sock" variant of the malware scanner interface, accept an empty
+ cmdline element to get the documented default one. Previously it was
+ inaccessible.
+
+JH/15 Fix a crash in the smtp transport caused when two hosts in succession
+ are unsuable for non-message-specific reasons - eg. connection timeout,
+ banner-time rejection.
+
+JH/16 Fix logging of delivery remote port, when specified by router, under
+ callout/hold.
+
+PP/06 Repair manualroute's ability to take options in any order, even if one
+ is the name of a transport.
+ Fixes bug 2140.
+
+HS/01 Cleanup, prevent repeated use of -p/-oMr (CVE-2017-1000369)
+
+JH/17 Change the list-building routines interface to use the expanding-string
+ triplet model, for better allocation and copying behaviour.
+
+JH/18 Prebuild the data-structure for "builtin" macros, for faster startup.
+ Previously it was constructed the first time a possibly-matching string
+ was met in the configuration file input during startup; now it is done
+ during compilation.
+
+JH/19 Bug 2141: Use the full-complex API for Berkeley DB rather than the legacy-
+ compatible one, to avoid the (poorly documented) possibility of a config
+ file in the working directory redirecting the DB files, possibly correpting
+ some existing file. CVE-2017-10140 assigned for BDB.
+
+JH/20 Bug 2147: Do not defer for a verify-with-callout-and-random which is not
+ cache-hot. Previously, although the result was properly cached, the
+ initial verify call returned a defer.
+
+JH/21 Bug 2151: Avoid using SIZE on the MAIL for a callout verify, on any but
+ the main verify for receipient in uncached-mode.
+
+JH/22 Retire historical build files to an "unsupported" subdir. These are
+ defined as "ones for which we have no current evidence of testing".
+
+JH/23 DKIM: enforce the DNS pubkey record "h" permitted-hashes optional field,
+ if present. Previously it was ignored.
+
+JH/24 Start using specified-initialisers in C structure init coding. This is
+ a C99 feature (it's 2017, so now considered safe).
+
+JH/25 Use one-bit bitfields for flags in the "addr" data structure. Previously
+ if was a fixed-sized field and bitmask ops via macros; it is now more
+ extensible.
+
+PP/07 GitHub PR 56: Apply MariaDB build fix.
+ Patch provided by Jaroslav Škarvada.
+
+PP/08 Bug 2161: Fix regression in sieve quoted-printable handling introduced
+ during Coverity cleanups [4.87 JH/47]
+ Diagnosis and fix provided by Michael Fischer v. Mollard.
+
+JH/26 Fix DKIM bug: when the pseudoheader generated for signing was exactly
+ the right size to place the terminating semicolon on its own folded
+ line, the header hash was calculated to an incorrect value thanks to
+ the (relaxed) space the fold became.
+
+HS/02 Fix Bug 2130: large writes from the transport subprocess where chunked
+ and confused the parent.
+
+JH/27 Fix SOCKS bug: an unitialized pointer was deref'd by the transport process
+ which could crash as a result. This could lead to undeliverable messages.
+
+JH/28 Logging: "next input sent too soon" now shows where input was truncated
+ for log purposes.
+
+JH/29 Fix queue_run_in_order to ignore the PID portion of the message ID. This
+ matters on fast-turnover and PID-randomising systems, which were getting
+ out-of-order delivery.
+
+JH/30 Fix a logging bug on aarch64: an unsafe routine was previously used for
+ a possibly-overlapping copy. The symptom was that "Remote host closed
+ connection in response to HELO" was logged instead of the actual 4xx
+ error for the HELO.
+
+JH/31 Fix CHUNKING code to properly flush the unwanted chunk after an error.
+ Previously only that bufferd was discarded, resulting in SYMTP command
+ desynchronisation.
+
+JH/32 DKIM: when a message has multiple signatures matching an identity given
+ in dkim_verify_signers, run the dkim acl once for each. Previously only
+ one run was done. Bug 2189.
+
+JH/33 Downgrade an unfound-list name (usually a typo in the config file) from
+ "panic the current process" to "deliberately defer". The panic log is
+ still written with the problem list name; the mail and reject logs now
+ get a temp-reject line for the message that was being handled, saying
+ something like "domains check lookup or other defer". The SMTP 451
+ message is still "Temporary local problem".
+
+JH/34 Bug 2199: Fix a use-after-free while reading smtp input for header lines.
+ A crafted sequence of BDAT commands could result in in-use memory beeing
+ freed. CVE-2017-16943.
+
+HS/03 Bug 2201: Fix checking for leading-dot on a line during headers reading
+ from SMTP input. Previously it was always done; now only done for DATA
+ and not BDAT commands. CVE-2017-16944.
+
+JH/35 Bug 2201: Flush received data in BDAT mode after detecting an error fatal
+ to the message (such as an overlong header line). Previously this was
+ not done and we did not exit BDAT mode. Followon from the previous item
+ though a different problem.
+
+
+Exim version 4.89
+-----------------
+
+JH/01 Bug 1922: Support IDNA2008. This has slightly different conversion rules
+ than -2003 did; needs libidn2 in addition to libidn.
+
+JH/02 The path option on a pipe transport is now expanded before use.
+
+PP/01 GitHub PR 50: Do not call ldap_start_tls_s on ldapi:// connections.
+ Patch provided by "Björn", documentation fix added too.
+
+JH/03 Bug 2003: fix Proxy Protocol v2 handling: the address size field was
+ missing a wire-to-host endian conversion.
+
+JH/04 Bug 2004: fix CHUNKING in non-PIPELINEING mode. Chunk data following
+ close after a BDAT command line could be taken as a following command,
+ giving a synch failure. Fix by only checking for synch immediately
+ before acknowledging the chunk.
+
+PP/02 GitHub PR 52: many spelling fixes, which include fixing parsing of
+ no_require_dnssec option and creation of _HAVE_TRANSPORT_APPEND_MAILDIR
+ macro. Patches provided by Josh Soref.
+
+JH/05 Have the EHLO response advertise VRFY, if there is a vrfy ACL defined.
+ Previously we did not; the RFC seems ambiguous and VRFY is not listed
+ by IANA as a service extension. However, John Klensin suggests that we
+ should.
+
+JH/06 Bug 2017: Fix DKIM verification in -bh test mode. The data feed into
+ the dkim code may be unix-mode line endings rather than smtp wire-format
+ CRLF, so prepend a CR to any bare LF.
+
+JH/07 Rationalise the coding for callout smtp conversations and transport ones.
+ As a side-benfit, callouts can now use PIPELINING hence fewer round-trips.
+
+JH/08 Bug 2016: Fix DKIM verification vs. CHUNKING. Any BDAT commands after
+ the first were themselves being wrongly included in the feed into dkim
+ processing; with most chunk sizes in use this resulted in an incorrect
+ body hash calculated value.
+
+JH/09 Bug 2014: permit inclusion of a DKIM-Signature header in a received
+ DKIM signature block, for verification. Although advised against by
+ standards it is specifically not ruled illegal.
+
+JH/10 Bug 2025: Fix reception of (quoted) local-parts with embedded spaces.
+
+JH/11 Bug 2029: Fix crash in DKIM verification when a message signature block is
+ missing a body hash (the bh= tag).
+
+JH/12 Bug 2018: Re-order Proxy Protocol startup versus TLS-on-connect startup.
+ It seems that HAProxy sends the Proxy Protocol information in clear and
+ only then does a TLS startup, so do the same.
+
+JH/13 Bug 2027: Avoid attempting to use TCP Fast Open for non-transport client
+ TCP connections (such as for Spamd) unless the daemon successfully set
+ Fast Open mode on its listening sockets. This fixes breakage seen on
+ too-old kernels or those not configured for Fast Open, at the cost of
+ requiring both directions being enabled for TFO, and TFO never being used
+ by non-daemon-related Exim processes.
+
+JH/14 Bug 2000: Reject messages recieved with CHUNKING but with malformed line
+ endings, at least on the first header line. Try to canonify any that get
+ past that check, despite the cost.
+
+JH/15 Angle-bracket nesting (an error inserted by broken sendmails) levels are
+ now limited to an arbitrary five deep, while parsing addresses with the
+ strip_excess_angle_brackets option enabled.
+
+PP/03 Bug 2018: For Proxy Protocol and TLS-on-connect, do not over-read and
+ instead leave the unprompted TLS handshake in socket buffer for the
+ TLS library to consume.
+
+PP/04 Bug 2018: Also handle Proxy Protocol v2 safely.
+
+PP/05 FreeBSD compat: handle that Ports no longer create /usr/bin/perl
+
+JH/16 Drop variables when they go out of scope. Memory management drops a whole
+ region in one operation, for speed, and this leaves assigned pointers
+ dangling. Add checks run only under the testsuite which checks all
+ variables at a store-reset and panics on a dangling pointer; add code
+ explicitly nulling out all the variables discovered. Fixes one known
+ bug: a transport crash, where a dangling pointer for $sending_ip_address
+ originally assigned in a verify callout, is re-used.
+
+PP/06 Drop '.' from @INC in various Perl scripts.
+
+PP/07 Switch FreeBSD iconv to always use the base-system libc functions.
+
+PP/08 Reduce a number of compilation warnings under clang; building with
+ CC=clang CFLAGS+=-Wno-dangling-else -Wno-logical-op-parentheses
+ should be warning-free.
+
+JH/17 Fix inbound CHUNKING when DKIM disabled at runtime.
+
+HS/01 Fix portability problems introduced by PP/08 for platforms where
+ realloc(NULL) is not equivalent to malloc() [SunOS et al].
+
+HS/02 Bug 1974: Fix missing line terminator on the last received BDAT
+ chunk. This allows us to accept broken chunked messages. We need a more
+ general solution here.
+
+PP/09 Wrote util/chunking_fixqueue_finalnewlines.pl to help recover
+ already-broken messages in the queue.
+
+JH/18 Bug 2061: Fix ${extract } corrupting an enclosing ${reduce } $value.
+
+JH/19 Fix reference counting bug in routing-generated-address tracking.
+
Exim version 4.88
-----------------
+
JH/01 Use SIZE on MAIL FROM in a cutthrough connection, if the destination
supports it and a size is available (ie. the sending peer gave us one).
non-noisy when a race steals the message being considered.
JH/05 If main configuration option tls_certificate is unset, generate a
- selfsigned certificate for inbound TLS connections.
+ self-signed certificate for inbound TLS connections.
JH/06 Bug 165: hide more cases of password exposure - this time in expansions
in rewrites and routers.
JH/08 Bug 1836: Fix crash in VRFY handling when handed an unqualified name
(lacking @domain). Apply the same qualification processing as RCPT.
+JH/09 Bug 1804: Avoid writing msglog files when in -bh or -bhc mode.
+
+JH/10 Support ${sha256:} applied to a string (as well as the previous
+ certificate).
+
+JH/11 Cutthrough: avoid using the callout hints db on a verify callout when
+ a cutthrough deliver is pending, as we always want to make a connection.
+ This also avoids re-routing the message when later placing the cutthrough
+ connection after a verify cache hit.
+ Do not update it with the verify result either.
+
+JH/12 Cutthrough: disable when verify option success_on_redirect is used, and
+ when routing results in more than one destination address.
+
+JH/13 Cutthrough: expand transport dkim_domain option when testing for dkim
+ signing (which inhibits the cutthrough capability). Previously only
+ the presence of an option was tested; now an expansion evaluating as
+ empty is permissible (obviously it should depend only on data available
+ when the cutthrough connection is made).
+
+JH/14 Fix logging of errors under PIPELINING. Previously the log line giving
+ the relevant preceding SMTP command did not note the pipelining mode.
+
+JH/15 Fix counting of empty lines in $body_linecount and $message_linecount.
+ Previously they were not counted.
+
+JH/16 DANE: treat a TLSA lookup response having all non-TLSA RRs, the same
+ as one having no matching records. Previously we deferred the message
+ that needed the lookup.
+
+JH/17 Fakereject: previously logged as a normal message arrival "<="; now
+ distinguished as "(=".
+
+JH/18 Bug 1867: make the fail_defer_domains option on a dnslookup router work
+ for missing MX records. Previously it only worked for missing A records.
+
+JH/19 Bug 1850: support Radius libraries that return REJECT_RC.
+
+JH/20 Bug 1872: Ensure that acl_smtp_notquit is run when the connection drops
+ after the data-go-ahead and data-ack. Patch from Jason Betts.
+
+JH/21 Bug 1846: Send DMARC forensic reports for reject and quarantine results,
+ even for a "none" policy. Patch from Tony Meyer.
+
+JH/22 Fix continued use of a connection for further deliveries. If a port was
+ specified by a router, it must also match for the delivery to be
+ compatible.
+
+JH/23 Bug 1874: fix continued use of a connection for further deliveries.
+ When one of the recipients of a message was unsuitable for the connection
+ (has no matching addresses), we lost track of needing to mark it
+ deferred. As a result mail would be lost.
+
+JH/24 Bug 1832: Log EHLO response on getting conn-close response for HELO.
+
+JH/25 Decoding ACL controls is now done using a binary search; the source code
+ takes up less space and should be simpler to maintain. Merge the ACL
+ condition decode tables also, with similar effect.
+
+JH/26 Fix problem with one_time used on a redirect router which returned the
+ parent address unchanged. A retry would see the parent address marked as
+ delivered, so not attempt the (identical) child. As a result mail would
+ be lost.
+
+JH/27 Fix a possible security hole, wherein a process operating with the Exim
+ UID can gain a root shell. Credit to http://www.halfdog.net/ for
+ discovery and writeup. Ubuntu bug 1580454; no bug raised against Exim
+ itself :(
+
+JH/28 Enable {spool,log} filesystem space and inode checks as default.
+ Main config options check_{log,spool}_{inodes,space} are now
+ 100 inodes, 10MB unless set otherwise in the configuration.
+
+JH/29 Fix the connection_reject log selector to apply to the connect ACL.
+ Previously it only applied to the main-section connection policy
+ options.
+
+JH/30 Bug 1897: fix callouts connection fallback from TLS to cleartext.
+
+PP/01 Changed default Diffie-Hellman parameters to be Exim-specific, created
+ by me. Added RFC7919 DH primes as an alternative.
+
+PP/02 Unbreak build via pkg-config with new hash support when crypto headers
+ are not in the system include path.
+
+JH/31 Fix longstanding bug with aborted TLS server connection handling. Under
+ GnuTLS, when a session startup failed (eg because the client disconnected)
+ Exim did stdio operations after fclose. This was exposed by a recent
+ change which nulled out the file handle after the fclose.
+
+JH/32 Bug 1909: Fix OCSP proof verification for cases where the proof is
+ signed directly by the cert-signing cert, rather than an intermediate
+ OCSP-signing cert. This is the model used by LetsEncrypt.
+
+JH/33 Bug 1914: Ensure socket is nonblocking before draining after SMTP QUIT.
+
+HS/01 Fix leak in verify callout under GnuTLS, about 3MB per recipient on
+ an incoming connection.
+
+HS/02 Bug 1802: Do not half-close the connection after sending a request
+ to rspamd.
+
+HS/03 Use "auto" as the default EC curve parameter. For OpenSSL < 1.0.2
+ fallback to "prime256v1".
+
+JH/34 SECURITY: Use proper copy of DATA command in error message.
+ Could leak key material. Remotely exploitable. CVE-2016-9963.
+
Exim version 4.87
-----------------
+
JH/01 Bug 1664: Disable OCSP for GnuTLS library versions at/before 3.3.16
and 3.4.4 - once the server is enabled to respond to an OCSP request
it does even when not requested, resulting in a stapling non-aware
HS/02 Add the Exim version string to the process info. This way exiwhat
gives some more detail about the running daemon.
-JH/06 Bug 1395: time-limit cacheing of DNS lookups, to the TTL value. This may
+JH/06 Bug 1395: time-limit caching of DNS lookups, to the TTL value. This may
matter for fast-change records such as DNSBLs.
JH/07 Bug 1678: Always record an interface option value, if set, as part of a
JH/18 Bug 1709: When built with TLS support, the tls_advertise_hosts option now
defaults to "*" (all hosts). The variable is now available when not built
- with TLS, default unset, mainly to enable keeping the testuite sane.
+ with TLS, default unset, mainly to enable keeping the testsuite sane.
If a server certificate is not supplied (via tls_certificate) an error is
logged, and clients will find TLS connections fail on startup. Presumably
they will retry in-clear.
in transport context, after the attempt, and per-recipient. The latter type
is per host attempted. The event data is the error message, and the errno
information encodes the lookup type (A vs. MX) used for the (first) host,
- and the trailing two digits of the smtp 4xx reponse.
+ and the trailing two digits of the smtp 4xx response.
GF/01 Bug 1715: Fix for race condition in exicyclog, where exim could attempt
to write to mainlog (or rejectlog, paniclog) in the window between file
"pri" and "weight". Note that the previous implicit priority given by the
list order is no longer honoured.
-JH/22 Bugs 963, 1721: Fix some corner cases in message body canonicalisation
+JH/22 Bugs 963, 1721: Fix some corner cases in message body canonicalization
for DKIM processing.
JH/23 Move SOCKS5 support from Experimental to mainline, enabled for a build
extraction. Accept either.
-
Exim version 4.86
-----------------
+
JH/01 Bug 1545: The smtp transport option "retry_include_ip_address" is now
expanded.
now have the list separator specified.
JH/19 Bug 392: spamd_address, and clamd av_scanner, now support retry
- option values.
+ option values.
JH/20 Bug 1571: Ensure that $tls_in_peerdn is set, when verification fails
under OpenSSL.
JH/24 Verification callouts now attempt to use TLS by default.
-HS/01 DNSSEC options (dnssec_require_domains, dnssec_request_domains)
+HS/01 DNSSEC options (dnssec_require_domains, dnssec_request_domains)
are generic router options now. The defaults didn't change.
JH/25 Bug 466: Add RFC2322 support for MIME attachment filenames.
HS/02 Bug 1575: exigrep falls back to autodetection of compressed
files if ZCAT_COMMAND is not executable.
-JH/26 Bug 1539: Add timout/retry options on dnsdb lookups.
+JH/26 Bug 1539: Add timeout/retry options on dnsdb lookups.
JH/27 Bug 286: Support SOA lookup in dnsdb lookups.
JH/28 Bug 1588: Do not use the A lookup following an AAAA for setting the FQDN.
Normally benign, it bites when the pair was led to by a CNAME;
- modern usage is to not canoicalize the domain to a CNAME target
+ modern usage is to not canonicalize the domain to a CNAME target
(and we were inconsistent anyway for A-only vs AAAA+A).
JH/29 Bug 1632: Removed the word "rejected" from line logged for ACL discards.
Exim version 4.85
-----------------
+
TL/01 When running the test suite, the README says that variables such as
no_msglog_check are global and can be placed anywhere in a specific
test's script, however it was observed that placement needed to be near
with certificate use, exposed issues where response data items split
over buffer boundaries were not parsed properly. This eventually
resulted in duplicates being sent. This issue only became common enough
- to notice due to the introduction of conection certificate information,
+ to notice due to the introduction of connection certificate information,
the item size being so much larger. Found and fixed by Wolfgang Breyha.
JH/06 Bug 1533: Fix truncation of items in headers_remove lists. A fixed
JH/07 Add support for directories of certificates when compiled with a GnuTLS
version 3.3.6 or later.
-JH/08 Rename the TPDA expermimental facility to Event Actions. The #ifdef
+JH/08 Rename the TPDA experimental facility to Event Actions. The #ifdef
is EXPERIMENTAL_EVENT, the main-configuration and transport options
both become "event_action", the variables become $event_name, $event_data
and $event_defer_errno. There is a new variable $verify_mode, usable in
JH/15 Updates and fixes to the EXPERIMENTAL_DSN feature.
-JH/16 Fix string representation of time values on 64bit time_t anchitectures.
+JH/16 Fix string representation of time values on 64bit time_t architectures.
Bug 1561.
JH/17 Fix a null-indirection in certextract expansions when a nondefault
return.
JH/01 Bug 1513: Fix parsing of quoted parameter values in MIME headers.
- This was a regression intruduced in 4.83 by another bugfix.
+ This was a regression introduced in 4.83 by another bugfix.
JH/02 Fix broken compilation when EXPERIMENTAL_DSN is enabled.
advertises the facility. If the client requests PRDR a new
acl_data_smtp_prdr ACL is called once for each recipient, after
the body content is received and before the acl_smtp_data ACL.
- The client is controlled by bolth of: a hosts_try_prdr option
+ The client is controlled by both of: a hosts_try_prdr option
on the smtp transport, and the server advertisement.
Default client logging of deliveries and rejections involving
PRDR are flagged with the string "PRDR".
JH/15 AUTH support on callouts (and hence cutthrough-deliveries).
Bugzilla 321, 823.
-TF/04 Added udpsend ACL modifer and hexquote expansion operator
+TF/04 Added udpsend ACL modifier and hexquote expansion operator
PP/21 Fix eximon continuous updating with timestamped log-files.
Broken in a format-string cleanup in 4.80, missed when I repaired the
Analysis and variant patch by Todd Lyons.
NM/04 Bugzilla 1237 - fix cases where printf format usage not indicated
- Bug report from Lars Müller <lars@samba.org> (via SUSE),
+ Bug report from Lars Müller <lars@samba.org> (via SUSE),
Patch from Dirk Mueller <dmueller@suse.com>
PP/13 tls_peerdn now print-escaped for spool files.
diagnostics.
Report and patch from Dmitry Banschikov.
-PP/16 Removed "dont_insert_empty_fragments" fron "openssl_options".
+PP/16 Removed "dont_insert_empty_fragments" from "openssl_options".
Removed SSL_clear() after SSL_new() which led to protocol negotiation
failures. We appear to now support TLS1.1+ with Exim.
has clearer semantics. The /leaky, /strict, and /readonly update modes
are mutually exclusive. The update mode is no longer included in the
database key; it just determines when the database is updated. (This
- means that when you upgrde Exim will forget old rate measurements.)
+ means that when you upgrade Exim will forget old rate measurements.)
Exim now checks that the per_* options are used with an update mode that
makes sense for the current ACL. For example, when Exim is processing a
Exim version 4.75
-----------------
-NM/01 Workround for PCRE version dependency in version reporting
+NM/01 Workaround for PCRE version dependency in version reporting
Bugzilla 1073
TF/01 Update valgrind.h and memcheck.h to copies from valgrind-3.6.0.
variable declaration deep within a block. Bug and patch from
Dennis Davis.
-PP/15 lookups-Makefile IRIX compatibilty coercion.
+PP/15 lookups-Makefile IRIX compatibility coercion.
PP/16 Make DISABLE_DKIM build knob functional.
colons if the lookup type is iplsearch. This is not incompatible, because
previously such lookups could never work.
- The situation is now rather anomolous, since one *can* have colons in
+ The situation is now rather anomalous, since one *can* have colons in
ordinary lsearch keys. However, making the change in all cases is
incompatible and would probably break a number of configurations.
PH/20 Added hosts_avoid_pipelining to the smtp transport.
PH/21 Long custom messages for fakedefer and fakereject are now split up
- into multiline reponses in the same way that messages for "deny" and
+ into multiline responses in the same way that messages for "deny" and
other ACL rejections are.
PH/22 Applied Jori Hamalainen's speed-up changes and typo fixes to exigrep,
runs only) independently of the message's sender address. This meant
that, if the 4xx error was in fact related to the sender, a different
message to the same recipient with a different sender could confuse
- things. In particualar, this can happen when sending to a greylisting
+ things. In particular, this can happen when sending to a greylisting
server, but other circumstances could also provoke similar problems.
I have changed the default so that the retry time for these errors is now
based a combination of the sender and recipient addresses. This change
JJ/03 exipick.20061117.2, made header handling as similar to exim as possible
(added [br]h_ prefixes, implemented RFC2047 decoding. Fixed
- whitesspace changes from 4.64-PH/27
+ whitespace changes from 4.64-PH/27
JJ/04 exipick.20061117.2, fixed format and added $message_headers_raw to
match 4.64-PH/13
(a) Failures to set uid/gid, the current directory, or a process leader
in a subprocess such as that created by queryprogram now generate
- suitable debugging ouput when -d is set.
+ suitable debugging output when -d is set.
(b) The queryprogram router detects when it is not running as root,
outputs suitable debugging information if -d is set, and then runs
and most important:
o fixes a bug in processing the envelope test (when testing
- multiple envelope elements, the last element determinted the
+ multiple envelope elements, the last element determined the
result)
PH/10 Exim was violating RFC 3834 ("Recommendations for Automatic Responses to
Auto-submitted: auto-generated
in the messages that it generates (bounce messages and others, such as
- warnings). In the case of bounce messages for non-SMTP mesages, there was
+ warnings). In the case of bounce messages for non-SMTP messages, there was
also a typo: it was using "Auto_submitted" (underscore instead of
hyphen). Since every message generated by Exim is necessarily in response
to another message, thes have all been changed to:
PH/05 There's a shambles in IRIX6 - it defines EX_OK in unistd.h which conflicts
with the definition in sysexits.h (which is #included earlier).
Fortunately, Exim does not actually use EX_OK. The code used to try to
- preserve the sysexits.h value, by assumimg that macro definitions were
+ preserve the sysexits.h value, by assuming that macro definitions were
scanned for macro replacements. I have been disabused of this notion,
so now the code just undefines EX_OK before #including unistd.h.
SC/01 Eximstats: added -xls and the ability to specify output files
(patch written by Frank Heydlauf).
-SC/02 Eximstats: use FileHandles for outputing results.
+SC/02 Eximstats: use FileHandles for outputting results.
SC/03 Eximstats: allow any combination of xls, txt, and html output.
58. When a "warn" ACL statement has a log_message modifier, the message is
remembered, and not repeated. This is to avoid a lot of repetition when a
message has many recipients that cause the same warning to be written.
- Howewer, Exim was preserving the list of already written lines for an
+ However, Exim was preserving the list of already written lines for an
entire SMTP session, which doesn't seem right. The memory is now reset if a
new message is started.
the list was checked. (An example that provoked this was putting <; in the
middle of a list instead of at the start.) If this happened during a DATA
ACL check, a -D file could be left lying around. This kind of configuration
- error no longer causes Exim to die; instead it causes a defer errror. The
+ error no longer causes Exim to die; instead it causes a defer error. The
incident is still logged to the main and panic logs.
74. Buglet left over from Exim 3 conversion. The message "too many messages
systems (e.g. Solaris), it also passes back the IP address string as the
"host name". However, on others (e.g. Linux), it passes back an empty
string. Exim wasn't checking for this, and was changing the host name to an
- empty string, assuming it had been canonicized.
+ empty string, assuming it had been canonicalized.
5. Although rare, it is permitted to have more than one PTR record for a given
IP address. I thought that gethostbyaddr() or getipnodebyaddr() always gave
13. The install script calls Exim with "-C /dev/null" in order to find the
version number. If ALT_CONFIG_PREFIX was set, this caused an error message
- to be output. Howeve, since Exim outputs its version number before the
+ to be output. However, since Exim outputs its version number before the
error, it didn't break the script. It just looked ugly. I fixed this by
always allowing "-C /dev/null" if the caller is root.
34. Testing for a connection timeout using "timeout_connect" in the retry rules
did not work. The code looks as if it has *never* worked, though it appears
- to have been documented since at least releast 1.62. I have made it work.
+ to have been documented since at least release 1.62. I have made it work.
35. The "timeout_DNS" error in retry rules, also documented since at least
1.62, also never worked. As it isn't clear exactly what this means, and
16. Check for letters, digits, hyphens, and dots in the names of dnslist
domains, and warn by logging if others are found.
-17. At least on BSD, alignment is not guarenteed for the array of ifreq's
+17. At least on BSD, alignment is not guaranteed for the array of ifreq's
returned from GIFCONF when Exim is trying to find the list of interfaces on
a host. The code in os.c has been modified to copy each ifreq to an aligned
structure in all cases.
24. Ignore Sendmail's -Ooption=value command line item.
25. When execve() failed while trying to run a command in a pipe transport,
- Exim was returning EX_UNAVAILBLE (69) from the subprocess. However, this
+ Exim was returning EX_UNAVAILABLE (69) from the subprocess. However, this
could be confused with a return value of 69 from the command itself. This
has been changed to 127, the value the shell returns if it is asked to run
a non-existent command. The wording for the related log line suggests a
47. Change 50 for 4.20 was a heap of junk. I don't know what I was thinking
when I implemented it. It didn't allow for the fact that some option values
- may legitimatetly be negative (e.g. size_addition), and it didn't even do
+ may legitimately be negative (e.g. size_addition), and it didn't even do
the right test for positive values.
48. Domain names in DNS records are case-independent. Exim always looks them up
git://git.exim.org / users / jgh / exim.git / blobdiff