Please include build with utf-8 included

[heitbaum]

Summary of the new feature / enhancement

With QR functionality MS Entra ID ubuntu/authd#497 being introduced in ubuntu auth/sshd/ - please enable utf-8. I have tested with the latest https://github.com/PowerShell/Win32-OpenSSH/releases/tag/v9.5.0.0p1-Beta

ref:

• https://github.com/ubuntu/authd-oidc-brokers
• https://github.com/ubuntu/authd

Proposed technical implementation details (optional)

No response

[mgkuhn]

Display of UTF-8 characters has worked for a long time in normal SSH sessions when you invoke ssh in Windows Terminal to connect to a Linux machine, including on current Windows 11 with OpenSSH_for_Windows_9.5p1.

UTF-8 example files such as

$ curl https://www.cl.cam.ac.uk/~mgk25/ucs/examples/UTF-8-demo.txt

display very nicely via OpenSSH for WIndows in Windows Terminal.

[mgkuhn]

Is the problem perhaps merely that during KbdInteractiveAuthentication that non-ASCII bytes in challenge strings are not passed through transparently, but are escaped as octal numbers with backslashes?

[mgkuhn]

This seems to be an openssh-portable upstream issue, with an open PR at openssh/openssh-portable#452 and therefore may not actually be specific to OpenSSH for Windows.

It looks as if such QR codes rendered using UTF-8 block-graphic characters in PAM-based kbd-interactive dialogues only work on Ubuntu's OpenSSH fork so far, because Ubuntu had patched their own version of OpenSSH, as upstream OpenSSH so far escapes many bytes in these PAM dialogue strings via strnvis().