Bug#1020235: ssh-copy-id: hangs when (root) user has no password

Package: openssh-client
Version: 1:9.0p1-1+b1
Severity: normal

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I recently flashed my router with OpenWrt and had not (yet) defined a
password for the (root) user.
Trying to do ``ssh-copy-id [email protected]`` resulted in a hang
process. Doing ``ssh [email protected]`` worked, with I assume password
authentication.

After setting the (root) user password, ``ssh-copy-id`` asked for the
password and then successfully completed the action.

Then only way out of the hang process was sending a SIGKILL to it.

I don't know if it would act differently for a non-root user (as that's
the only user OpenWrt uses), but if it doesn't support a password-less
user, then I'd expect an error message, not a hung process.


- -- System Information:
Debian Release: bookworm/sid
  APT prefers testing
  APT policy: (990, 'testing'), (500, 'stable-security'), (500, 'unstable'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 5.19.0-1-amd64 (SMP w/4 CPU threads; PREEMPT)
Kernel taint flags: TAINT_WARN
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-client depends on:
ii  adduser           3.129
ii  dpkg              1.21.9
ii  libc6             2.34-7
ii  libedit2          3.1-20210910-1
ii  libfido2-1        1.11.0-1+b1
ii  libgssapi-krb5-2  1.20-1
ii  libselinux1       3.4-1+b1
ii  libssl3           3.0.5-2
ii  passwd            1:4.11.1+dfsg1-2
ii  zlib1g            1:1.2.11.dfsg-4.1

Versions of packages openssh-client recommends:
ii  xauth  1:1.1.1-1

Versions of packages openssh-client suggests:
pn  keychain                   <none>
ii  ksshaskpass [ssh-askpass]  4:5.25.4-1
pn  libpam-ssh                 <none>
pn  monkeysphere               <none>
ii  ssh-askpass                1:1.2.4.1-15

- -- no debconf information

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