Debian Bug report logs - #998834
Multiple subsystem options in sshd_config prevent sshd from starting

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Message #5 received at submit@bugs.debian.org (full text, mbox, reply):

From: Marcus Frings <marcus.frings@oc.rwth-aachen.de>

To: Debian Bug Tracking System <submit@bugs.debian.org>

Subject: Multiple subsystem options in sshd_config prevent sshd from starting

Date: Mon, 8 Nov 2021 13:08:02 +0100

Package: openssh-server
Version: 1:8.7p1-1
Severity: important

Dear maintainers,

In /etc/ssh/sshd_config the option

  "Subsystem sftp /usr/lib/openssh/sftp-server"

is active by default.

"man 5 sshd_config" states:

  "/etc/ssh/sshd_config.d/*.conf files are included at the start of the
  configuration file, so options set there will override those in
  /etc/ssh/sshd_config."

However, after adding

  "Subsystem sftp /usr/lib/openssh/sftp-server -f AUTHPRIV -l INFO"

to /etc/ssh/sshd_config.d/10-marcus-sshd-config.conf, the ssh server fails
to start.

Hence, my attempt to leave the original sshd_config untouched and move
all my manually modified settings to a file parsed via the include
directive results in a broken ssh server.

Running "sshd -T" tells:

  /etc/ssh/sshd_config line 116: Subsystem 'sftp' already defined.

This undocumented behaviour contradicts the statement of the man page cited
above. I could not find any Debian bug report in the openssh-* packages
regarding this issue (please forgive me if I missed it).

In the end I dropped my new approach of using
/etc/ssh/sshd_config.d/*.conf and went back to a manually modified
/etc/ssh/sshd_config, until this issue is solved.

By the way, after a brief search on the error message I found the same
problem reported there as well:

https://bugzilla.mindrot.org/show_bug.cgi?id=3236

(Thus, I used the same subject line as in the cited bug report.)

Best regards,
Marcus

-- System Information:
Debian Release: bookworm/sid
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 5.14.0-3-amd64 (SMP w/8 CPU threads)
Kernel taint flags: TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US:en
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages openssh-server depends on:
ii  adduser                3.118
ii  debconf [debconf-2.0]  1.5.79
ii  dpkg                   1.20.9
ii  libaudit1              1:3.0.6-1
ii  libc6                  2.32-4
ii  libcom-err2            1.46.4-1
ii  libcrypt1              1:4.4.25-2
ii  libgssapi-krb5-2       1.18.3-7
ii  libkrb5-3              1.18.3-7
ii  libpam-modules         1.4.0-10
ii  libpam-runtime         1.4.0-10
ii  libpam0g               1.4.0-10
ii  libselinux1            3.1-3+b1
ii  libssl1.1              1.1.1l-1
ii  libsystemd0            249.5-2
ii  libwrap0               7.6.q-31
ii  lsb-base               11.1.0
ii  openssh-client         1:8.7p1-1
ii  openssh-sftp-server    1:8.7p1-1
ii  procps                 2:3.3.17-5
ii  runit-helper           2.10.3
ii  ucf                    3.0043
ii  zlib1g                 1:1.2.11.dfsg-2

Versions of packages openssh-server recommends:
ii  libpam-systemd [logind]  249.5-2
pn  ncurses-term             <none>
ii  xauth                    1:1.1-1

Versions of packages openssh-server suggests:
pn  molly-guard   <none>
pn  monkeysphere  <none>
pn  ssh-askpass   <none>
pn  ufw           <none>

-- debconf information excluded

Message #10 received at 998834@bugs.debian.org (full text, mbox, reply):

From: Jan Wagner <waja@cyconet.org>

To: Marcus Frings <marcus.frings@oc.rwth-aachen.de>, 998834@bugs.debian.org

Cc: control@bugs.debian.org

Subject: Re: Multiple subsystem options in sshd_config prevent sshd from starting

Date: Tue, 9 May 2023 09:43:57 +0200

tags 998834 + patch
thanks

https://bugzilla.mindrot.org/attachment.cgi?id=3591&action=diff&collapsed=&headers=1&format=raw 
has a patch for this

Message #17 received at 998834@bugs.debian.org (full text, mbox, reply):

From: Jan Wagner <waja@cyconet.org>

To: Marcus Frings <marcus.frings@oc.rwth-aachen.de>, 998834@bugs.debian.org

Subject: Re: Multiple subsystem options in sshd_config prevent sshd from starting

Date: Mon, 4 Sep 2023 22:13:51 +0200

Hi,

Am 09.05.23 um 09:43 schrieb Jan Wagner:
> https://bugzilla.mindrot.org/attachment.cgi?id=3591&action=diff&collapsed=&headers=1&format=raw has a patch for this

what needs to happen to raise the chance to get that integrated? It's 
super annoying to work around this and (re)integrate this back after 
every dist upgrade. If Debian wants to be user friedly this is a feature 
which might underline it.
If there is anything I can help to move things forward, please let me 
know and I will try my best to do so.

Many thanks, Jan

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