Hi!

The patch below links exim4-daemon-heavy to libgsasl to enable the
'gsasl' authenticator support in exim, see:

https://exim.org/exim-html-current/doc/html/spec_html/ch-the_gsasl_authenticator.html

This makes it possible to enable SCRAM-SHA-1 and SCRAM-SHA-256 in Exim
via libgsasl.

Any chance this could make it into bullseye?  Thanks :)

I have done some testing using a minimal gsasl driver, and it seems to
work.  Configuration on the server side:

root@sid:/etc/exim4# cat conf.d/auth/50-sid
gsasl:
  driver = gsasl
  public_name = SCRAM-SHA-1
  server_password = foo
  server_set_id = ${quote:$auth1}
  server_condition = yes
root@sid:/etc/exim4#

Client side works:

jas@latte:~$ LANG=C gsasl x.y.z.q 587 --no-starttls --mechanism SCRAM-SHA-1 -a jas --password foo -d
Trying 'x.y.z.q'...
220 sid ESMTP Exim 4.94 Sat, 23 Jan 2021 22:20:48 +0000
EHLO [127.0.0.1]
250-sid Hello ...
250-SIZE 52428800
250-8BITMIME
250-PIPELINING
250-PIPE_CONNECT
250-AUTH SCRAM-SHA-1
250-CHUNKING
250-STARTTLS
250-PRDR
250 HELP
AUTH SCRAM-SHA-1
334
biwsbj1qYXMscj1oOEh0TmFxci9UclA4eDlrbHlOeFhQTWc=
334 cj1oOEh0TmFxci9UclA4eDlrbHlOeFhQTWdPYkNqUnQ2OFU1Y0pJblR5ZWtyam12aVEscz15QnU1N3JNN3RwenFlNUpiLGk9NDA5Ng==
Yz1iaXdzLHI9aDhIdE5hcXIvVHJQOHg5a2x5TnhYUE1nT2JDalJ0NjhVNWNKSW5UeWVrcmptdmlRLHA9V1hVWGliY05tYTVZMk9UVExqQnlmWUNJT1NVPQ==
334 dj1pNkgzeW9IWWhVTXJxdERYd3VPaURYM0t6T2s9

235 Authentication succeeded
Client authentication finished (server trusted)...
Session finished...
QUIT
221 sid closing connection
jas@latte:~$

/Simon

[...]

Hello Simon,

I am very reluctant to link exim against another SASL library since it
is already linked against the Cyrus SASL library.

cu Andreas

sön 2021-01-24 klockan 18:18 +0100 skrev Andreas Metzler:

Hi!  Any chance this could be revisited?  Linking to both Cyrus SASL
and GNU SASL is similar to linking to both MySQL and PostgreSQL in my
mind.  Exim already links to multiple similar libraries too, e.g.
OpenSSL/GnuTLS, libcrypto/libnettle.

/Simon

Control: tags -1 - pending

Hello Simon,

The upload to fix this was rejected during NEW processing, dfsg team now
seems to have a hard requirement for DEP5.

I will need to check whether exim4's copyright file can be maintained
with cme, a oneshot conversions just increases the maintenace burden.

Anyway this is going to take at least a couple hours, and I do not
know yet when I have the time and an energy to spend on this. So I am
removing the *pending* tag.

cu Andreas

We believe that the bug you reported is fixed in the latest version of
exim4, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 980893@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Andreas Metzler <ametzler@debian.org> (supplier of updated exim4 package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)
Format: 1.8
Date: Sun, 06 Sep 2026 14:13:30 +0200
Source: exim4
Binary: exim4 exim4-base exim4-base-dbgsym exim4-config exim4-daemon-heavy exim4-daemon-heavy-dbgsym exim4-daemon-light exim4-daemon-light-dbgsym exim4-daemon-mod exim4-daemon-mod-dbgsym exim4-dev exim4-mod-cyrus-sasl exim4-mod-cyrus-sasl-dbgsym exim4-mod-gsasl exim4-mod-gsasl-dbgsym exim4-mod-ldap exim4-mod-ldap-dbgsym exim4-mod-mysql exim4-mod-mysql-dbgsym exim4-mod-pam exim4-mod-pam-dbgsym exim4-mod-perl exim4-mod-perl-dbgsym exim4-mod-postgresql exim4-mod-postgresql-dbgsym exim4-mod-spf exim4-mod-spf-dbgsym eximon4 eximon4-dbgsym
Architecture: source amd64 all
Version: 4.100-4
Distribution: experimental
Urgency: low
Maintainer: Exim4 Maintainers <pkg-exim4-maintainers@lists.alioth.debian.org>
Changed-By: Andreas Metzler <ametzler@debian.org>
Description:
 exim4      - metapackage to ease Exim MTA (v4) installation
 exim4-base - support files for all Exim MTA (v4) packages
 exim4-config - configuration for the Exim MTA (v4)
 exim4-daemon-heavy - Exim MTA (v4) daemon with extended features, including exiscan-ac
 exim4-daemon-light - lightweight Exim MTA (v4) daemon
 exim4-daemon-mod - Exim MTA (v4) daemon with minimal hard dependencies
 exim4-dev  - header files for the Exim MTA (v4) packages
 exim4-mod-cyrus-sasl - exim4 Cyrus SASL authenticator module
 exim4-mod-gsasl - exim4 GNU SASL authenticator module
 exim4-mod-ldap - exim4 LDAP lookup module
 exim4-mod-mysql - exim4 MariaDB/MySQL lookup module
 exim4-mod-pam - exim4 pam support module
 exim4-mod-perl - exim4 embedded perl module
 exim4-mod-postgresql - exim4 PostgreSQL lookup module
 exim4-mod-spf - exim4 SPF ACL module
 eximon4    - monitor application for the Exim MTA (v4) (X11 interface)
Closes: 980893
Changes:
 exim4 (4.100-4) experimental; urgency=low
 .
   * Add GNU SASL authenticator module for exim4-daemon-mod. (Closes: #980893)
   * Run wrap-and-sort -ast.
   * Upload to experimental.
   * Add DEP-5 copyright file.
     Generated with
     cp debian/copyright.template debian/copyright && cme update dpkg-copyright
     This is partially broken due to #1135671 and #1139580.
     Retain old version in exim4-base's
     /usr/share/doc/exim4-base/debian/copyright.readable.gz.
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