ssh-sk-helper (FIDO2/U2F ssh support) missing dependencies

[peterh]

ssh-sk-helper.exe cannot run, because it is missing a handful of dependencies. To work around this issue, I copied the following DLLs from C:\Program Files\Git\usr\bin to C:\Program Files\Git\usr\lib\ssh:

msys-2.0.dll
msys-cbor-0.11.dll
msys-crypto-3.dll
msys-fido2-1.dll
msys-gcc_s-seh-1.dll
msys-z.dll

Full environment details:

• [x] I was not able to find an open or closed issue matching what I'm seeing

2525 appears to be the original feature request, but does not say anything about this issue.

Setup

• Which version of Git for Windows are you using? Is it 32-bit or 64-bit?

C:\> git --version --build-options

git version 2.47.0.windows.1
cpu: x86_64
built from commit: d53e4648cb65eb75dd8d8a093d17400a18a9a15d
sizeof-long: 4
sizeof-size_t: 8
shell-path: D:/git-sdk-64-build-installers/usr/bin/sh
feature: fsmonitor--daemon
libcurl: 8.10.1
OpenSSL: OpenSSL 3.2.3 3 Sep 2024
zlib: 1.3.1

(Same with the previous couple of versions too)

• Which version of Windows are you running? Vista, 7, 8, 10? Is it 32-bit or 64-bit?

Windows 11 22H2

C:\> cmd.exe /c ver

Microsoft Windows [Version 10.0.22621.4169]

• What options did you set as part of the installation? Or did you choose the defaults?

C:\> type "C:\Program Files\Git\etc\install-options.txt"

Editor Option: VIM
Custom Editor Path:
Default Branch Option:
Path Option: Cmd
SSH Option: OpenSSH
Tortoise Option: false
CURL Option: OpenSSL
CRLF Option: CRLFCommitAsIs
Bash Terminal Option: MinTTY
Git Pull Behavior Option: Merge
Use Credential Manager: Enabled
Performance Tweaks FSCache: Enabled
Enable Symlinks: Disabled
Enable FSMonitor: Disabled

• Any other interesting things about your environment that might be related to the issue you're seeing?

Tested a YubiKey "Security Key C NFC" (not to be confused with the YubiKey "5C NFC", which looks the same but has more features) and a Hypersecu "HyperFIDO Pro Mini"

Details

• Which terminal/shell are you running Git from? e.g Bash/CMD/PowerShell/other

cmd

• What commands did you run to trigger this issue? If you can provide a Minimal, Complete, and Verifiable example this will help us understand the issue.

ssh-keygen -t ed25519-sk, add the id_ed25519_sk.pub to github, gitlab, or "servername", ssh servername

• What did you expect to occur after running these commands?

Prompt to touch security key, followed by ssh connection to server.

• What actually happened instead?

ssh-sk-helper.exe crashed, there was no security key prompt, and the ssh connection did not complete.

• If the problem was occurring with a specific repository, can you provide the URL to that repository to help us with testing?

No specific repository.

[dscho]

shell-path: D:/git-sdk-64-build-installers/usr/bin/sh

That seems not exactly to be a supported scenario. Have you not installed this via the official installer? I ask because when I run ssh-keygen -t ed25519-sk from a regular Git Bash, as installed by the regular Git for Windows v2.47.0 installer, I do not get a crash, but a couple of dialogs until one asks for a USB security key to be inserted.