Bug#972091: openssh-client: ssh -o KbdInteractiveAuthentication=no gets ignored

[Drexl Johannes <johannes.drexl@lrz.de>]

Package: openssh-client
Version: 1:7.9p1-10+deb10u2
Severity: normal

Dear Maintainer,

connecting to a server disabling keyboard-interactive authentication
does not actually disable it; -vvv shows:

debug1: Authentications that can continue: publickey,keyboard-interactive
debug2: we did not send a packet, disable method
debug3: authmethod_lookup keyboard-interactive
debug3: remaining preferred:
debug3: authmethod_is_enabled keyboard-interactive
debug1: Next authentication method: keyboard-interactive
debug2: userauth_kbdint
debug3: send packet: type 50
debug2: we sent a keyboard-interactive packet, wait for reply
debug3: receive packet: type 60
debug2: input_userauth_info_req
debug2: input_userauth_info_req: num_prompts 1
Password:

This should not happen. Guess there's just a minor logic error
somewhere.

-- System Information:
Debian Release: 10.6
  APT prefers stable
  APT policy: (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.19.0-11-amd64 (SMP w/8 CPU cores)
Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8), LANGUAGE=de_DE.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages openssh-client depends on:
ii  adduser           3.118
ii  dpkg              1.19.7
ii  libc6             2.28-10
ii  libedit2          3.1-20181209-1
ii  libgssapi-krb5-2  1.17-3
ii  libselinux1       2.8-1+b1
ii  libssl1.1         1.1.1d-0+deb10u3
ii  passwd            1:4.5-1.1
ii  zlib1g            1:1.2.11.dfsg-1

Versions of packages openssh-client recommends:
ii  xauth  1:1.0.10-1

Versions of packages openssh-client suggests:
pn  keychain      <none>
pn  libpam-ssh    <none>
pn  monkeysphere  <none>
pn  ssh-askpass   <none>

-- no debconf information