pipe transport: taint-enforce command

[users/jgh/exim.git] / doc / doc-txt / ChangeLog

diff --git a/doc/doc-txt/ChangeLog b/doc/doc-txt/ChangeLog
index 065ec2812167d88272daea005f5c26623104002f..c803fdb7edb1765250ad89de76afa56146096ec6 100644 (file)
--- a/doc/doc-txt/ChangeLog
+++ b/doc/doc-txt/ChangeLog
@@ -1,10 +1,97 @@
-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.
 
 
 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 4.94
+-----------------
+
+JH/01 Avoid costly startup code when not strictly needed.  This reduces time
+      for some exim process initialisations.  It does mean that the logging
+      of TLS configuration problems is only done for the daemon startup.
+
+JH/02 Early-pipelining support code is now included unless disabled in Makefile.
+
+JH/03 DKIM verification defaults no long accept sha1 hashes, to conform to
+      RFC 8301.  They can still be enabled, using the dkim_verify_hashes main
+      option.
+
+JH/04 Support CHUNKING from an smtp transport using a transport_filter, when
+      DKIM signing is being done.  Previously a transport_filter would always
+      disable CHUNKING, falling back to traditional DATA.
+
+JH/05 Regard command-line receipients as tainted.
+
+JH/06 Bug 340: Remove the daemon pid file on exit, whe due to SIGTERM.
+
+JH/07 Bug 2489: Fix crash in the "pam" expansion condition.  It seems that the
+      PAM library frees one of the arguments given to it, despite the
+      documentation.  Therefore a plain malloc must be used.
+
+JH/08 Bug 2491: Use tainted buffers for the transport smtp context.  Previously
+      on-stack buffers were used, resulting in a taint trap when DSN information
+      copied from a received message was written into the buffer.
+
+JH/09 Bug 2493: Harden ARC verify against Outlook, whick has been seen to mix
+      the ordering of its ARC headers.  This caused a crash.
+
+JH/10 Bug 2492: Use tainted memory for retry record when needed.  Previously when
+      a new record was being constructed with information from the peer, a trap
+      was taken.
+
+JH/11 Bug 2494: Unset the default for dmarc_tld_file.  Previously a naiive
+      installation would get error messages from DMARC verify, when it hit the
+      nonexistent file indicated by the default.  Distros wanting DMARC enabled
+      should both provide the file and set the option.
+      Also enforce no DMARC verification for command-line sourced messages.
+
+JH/12 Fix an uninitialised flag in early-pipelining.  Previously connections
+      could, depending on the platform, hang at the STARTTLS response.
+
+JH/13 Bug 2498: Reset a counter used for ARC verify before handling another
+      message on a connection.  Previously if one message had ARC headers and
+      the following one did not, a crash could result when adding an
+      Authentication-Results: header.
+
+JH/14 Bug 2500: Rewind some of the common-coding in string handling between the
+      Exim main code and Exim-related utities.  The introduction of taint
+      tracking also did many adjustments to string handling.  Since then, eximon
+      frequently terminated with an assert failure.
+
+JH/15 When PIPELINING, synch after every hundred or so RCPT commands sent and
+      check for 452 responses.  This slightly helps the inefficieny of doing
+      a large alias-expansion into a recipient-limited target.  The max_rcpt
+      transport option still applies (and at the current default, will override
+      the new feature).  The check is done for either cause of synch, and forces
+      a fast-retry of all 452'd recipients using a new MAIL FROM on the same
+      connection.  The new facility is not tunable at this time.
+
+JH/16 Fix the variables set by the gsasl authenticator.  Previously a pointer to
+      library live data was being used, so the results became garbage.  Make
+      copies while it is still usable.
+
+JH/17 Logging: when the deliver_time selector ise set, include the DT= field
+      on delivery deferred (==) and failed (**) lines (if a delivery was
+      attemtped).  Previously it was only on completion (=>) lines.
+
+JH/18 Authentication: the gsasl driver not provides the $authN variables in time
+      for the expansion of the server_scram_iter and server_scram_salt options.
+
+WB/01 SPF: DNS lookups for the obsolete SPF RR type done by the libspf2 library
+      are now specifically given a NO_DATA response without hitting the system
+      resolver.  The library goes on to do the now-standard TXT lookup.
+      Use of dnsdb lookups is not affected.
+
+JH/19 Bug 2507: Modules: on handling a dynamic-module (lookups) open failure,
+      only retrieve the errormessage once.  Previously two calls to dlerror()
+      were used, and the second one (for mainlog/paniclog) retrieved null
+      information.
+
+JH/20 Taint checking: disallow use of tainted data for the appendfile transport
+      file and directory options, and for the pipe transport command.
+      Previously this was permitted.
+
+

 Exim version 4.93
 -----------------
 
 Exim version 4.93
 -----------------
 


@@ -70,10 +157,10 @@ HS/01 Bug 2390: Use message_id for tempfile creation to avoid races in a
       systems which restrict the file name length to lower values.
       (It was "hdr.$pid".)
 
       systems which restrict the file name length to lower values.
       (It was "hdr.$pid".)
 

-HS/01 Bug 2390: Use message_id for tempfile creation to avoid races in a
+HS/02 Bug 2390: Use message_id for tempfile creation to avoid races in a

       shared (NFS) environment.
 
       shared (NFS) environment.
 

-HS/02 Bug 2392: exigrep does case sensitive *option* processing (as it
+HS/03 Bug 2392: exigrep does case sensitive *option* processing (as it

       did for all versions <4.90). Notably -M, -m, --invert, -I may be
       affected.
 
       did for all versions <4.90). Notably -M, -m, --invert, -I may be
       affected.
 


@@ -107,6 +194,121 @@ JH/21 The smtp transport option "hosts_noproxy_tls" is now unset by default.
       for multiple message deliveries, by default.  Previoud the default was to
       not do so.
 
       for multiple message deliveries, by default.  Previoud the default was to
       not do so.
 

+JH/22 The smtp transport option "hosts_try_dane" now enables all hosts by
+      default.  If built with the facility, DANE will be used.  The facility
+      SUPPORT_DANE is now enabled in the prototype build Makefile "EDITME".
+
+JH/23 The build default is now for TLS to be included; the SUPPORT_TLS define
+      is replaced with DISABLE_TLS.  Either USE_GNUTLS or (the new) USE_OPENSSL
+      must be defined and you must still, unless you define DISABLE_TLS, manage
+      the the include-dir and library-file requirements that go with that
+      choice.  Non-TLS builds are still supported.
+
+JH/24 Fix duplicated logging of peer name/address, on a transport connection-
+      reject under TFO.
+
+JH/25 The smtp transport option "hosts_try_fastopen" now enables all hosts by
+      default.  If the platform supports and has the facility enabled, it will
+      be requested on all coneections.
+
+JH/26 The PIPE_CONNECT facility is promoted from experimental status and is now
+      controlled by the build-time option SUPPORT_PIPE_CONNECT.
+
+PP/01 Unbreak heimdal_gssapi, broken in 4.92.
+
+JH/27 Bug 2404: Use the main-section configuration option "dsn_from" for
+      success-DSN messages.  Previously the From: header was always the default
+      one for these; the option was ignored.
+
+JH/28 Fix the timeout on smtp response to apply to the whole response.
+      Previously it was reset for every read, so a teergrubing peer sending
+      single bytes within the time limit could extend the connection for a
+      long time.  Credit to Qualsys Security Advisory Team for the discovery.
+
+JH/29 Fix DSN Final-Recipient: field.  Previously it was the post-routing
+      delivery address, which leaked information of the results of local
+      forwarding.  Change to the original envelope recipient address, per
+      standards.
+
+JH/30 Bug 2411: Fix DSN generation when RFC 3461 failure notification is
+      requested.  Previously not bounce was generated and a log entry of
+      error ignored was made.
+
+JH/31 Avoid re-expansion in ${sort } expansion. (CVE-2019-13917)
+
+JH/32 Introduce a general tainting mechanism for values read from the input
+      channel, and values derived from them.  Refuse to expand any tainted
+      values, to catch one form of exploit.
+
+JH/33 Bug 2413: Fix dkim_strict option.  Previously the expansion result
+      was unused and the unexpanded text used for the test.  Found and
+      fixed by Ruben Jenster.
+
+JH/34 Fix crash after TLS shutdown.  When the TCP/SMTP channel was left open,
+      an attempt to use a TLS library read routine dereffed a nul pointer,
+      causing a segfault.
+
+JH/35 Bug 2409: filter out-of-spec chars from callout response before using
+      them in our smtp response.
+
+JH/36 Have the general router option retry_use_local_part default to true when
+      any of the restrictive preconditions are set (to anything).  Previously it
+      was only for check_local user.  The change removes one item of manual
+      configuration which is required for proper retries when a remote router
+      handles a subset of addresses for a domain.
+
+JH/37 Appendfile: when evaluating quota use (non-quota_size_regex) take the file
+      link count into consideration.
+
+HS/04 Fix handling of very log lines in -H files. If a -<key> <value> line
+      caused the extension of big_buffer, the following lines were ignored.
+
+JH/38 Bug 1395: Teach the DNS negative-cache about TTL value from the SOA in
+      accordance with RFC 2308.  Previously there was no expiry, so a longlived
+      receive process (eg. due to ACL delays) versus a short SOA value could
+      surprise.
+
+HS/05 Handle trailing backslash gracefully. (CVE-2019-15846)
+
+JH/39 Promote DMARC support to mainline.
+
+JH/40 Bug 2452: Add a References: header to DSNs.
+
+JH/41 With GnuTLS 3.6.0 (and later) do not attempt to manage Diffie-Hellman
+      parameters.  The relevant library call is documented as "Deprecated: This
+      function is unnecessary and discouraged on GnuTLS 3.6.0 or later. Since
+      3.6.0, DH parameters are negotiated following RFC7919."
+
+HS/06 Change the default of dnssec_request_domains to "*"
+
+JH/42 Bug 2545: Fix CHUNKING for all RCPT commands rejected.  Previously we
+      carried on and emitted a BDAT command, even when PIPELINING was not
+      active.
+
+JH/43 Bug 2465: Fix taint-handling in dsearch lookup.  Previously a nontainted
+      buffer was used for the filename, resulting in a trap when tainted
+      arguments (eg. $domain) were used.
+
+JH/44 With OpenSSL 1.1.1 (onwards) disable renegotiation for TLS1.2 and below;
+      recommended to avoid a possible server-load attack.  The feature can be
+      re-enabled via the openssl_options main cofiguration option.
+
+JH/45 local_scan API: documented the current smtp_printf() call. This changed
+      for version 4.90 - adding a "more data" boolean to the arguments.
+      Bumped the ABI version number also, this having been missed previously;
+      release versions 4.90 to 4.92.3 inclusive were effectively broken in
+      respect of usage of smtp_printf() by either local_scan code or libraries
+      accessed via the ${dlfunc } expansion item.  Both will need coding
+      adjustment for any calls to smtp_printf() to match the new function
+      signature; a FALSE value for the new argument is always safe.
+
+JH/46 FreeBSD: fix use of the sendfile() syscall.  The shim was not updating
+      the file-offset (which the Linux syscall does, and exim expects); this
+      resulted in an indefinite loop.
+
+JH/47 ARC: fix crash in signing, triggered when a configuration error failed
+      to do ARC verification.  The Authentication-Results: header line added
+      by the configuration then had no ARC item.

 
 
 Exim version 4.92
 
 
 Exim version 4.92