Assuan griefing Windows socket

[AlexanderAllen]

Background

Assuan is a protocol that allows talking to the various GPG components available in the system, including the GPG agent.

See more:

• Assuan: https://www.gnupg.org/documentation/manuals/assuan/index.html
• Agent IPC: https://gnupg.org/documentation/manuals/gnupg-2.0/Agent-Protocol.html
• Key availability: https://gnupg.org/documentation/manuals/gnupg-2.0/Agent-HAVEKEY.html#Agent-HAVEKEY

With PR #10 the gpg module fetches the correct GPG agent socket path, but the path retrieved is not escaped and not something Assuan understands.

Use Case

• Using WSL.
• WSL can talk Windows paths, including sockets, see wsl-ssh-pageant, for example.
• Windows filesystem paths can be converted to 'nix via wsl.exe wslpath.
• Discovery: maybe translating the socket path to a nix flavor will please Mr. Assuan.

Command wslpath:

❯ wsl.exe wslpath
wslpath: Invalid argument
Usage:
    -a    force result to absolute path format
    -u    translate from a Windows path to a WSL path (default)
    -w    translate from a WSL path to a Windows path
    -m    translate from a WSL path to a Windows path, with '/' instead of '\'

[AlexanderAllen]

Some debugging details for posterity

Something to have fun with in the future.

Connecting to the socket using a Windows path:

Connecting using a (hardcoded) WSL path:

Error details (for WSL path above):

Error: connect ECONNREFUSED /mnt/c/Users/richa/AppData/Local/gnupg/S.gpg-agent\n\tat PipeConnectWrap.afterConnect [as oncomplete] (node:net:1494:16)\n\tat PipeConnectWrap.callbackTrampoline (node:internal/async_hooks:130:17)'

Breakpoint

File gpg.ts
Function sign

Get the socket path manually

❯ gpgconf.exe --list-dir agent-socket
C:\Users\richa\AppData\Local\gnupg\S.gpg-agent

[AlexanderAllen]

And... I have connection.

Do not that as a WSL User, I am using wsl2-ssh-pageant.

The default socket path with wsl2-ssh-pageant is:

❯ echo $GPG_AGENT_SOCK
/home/wsl/.gnupg/S.gpg-agent

The Assuan client does still seem to hang after initializing the connection: