rdscert - list Windows Remote Desktop machine certs in the format used by Remmina on Linux

rdscert

#!/usr/bin/bash
HASHALG=sha256
files=()
args=(-$HASHALG)

while (( $# )); do
    case $1 in
        -*)
            for arg in "${args[@]}"; do
                if [[ $1 == $arg ]]; then
                    echo "WARNING: Duplicate argument '$1'; ignoring" >&2;
                    shift; continue
                fi
            done
            args+=("$1")
            ;;
        *)
            if [[ ! -r $1 ]]; then
                echo "WARNING: Unreadable file '$1'" >&2
                shift; continue
            fi
            files+=("$1")
            ;;
    esac
    shift
done

if [[ -z "${files[@]}" ]]; then
    echo "usage: rdscert [openssl x509 args] CERTFILE [CERTFILE...]" >&2;
fi

for cert in "${files[@]}"; do
    ( set -x; openssl x509 -fingerprint "${args[@]}" -in "$cert" ) \
      | sed '/--*BEGIN/,/--*END/d'
done

Run certlm.msc from the Start menu, or search for "certificates" and then click "Manage computer certificates." (ref)

Then, browse to Remote Desktop → Certificates in the left-hand pane. In the right-hand pane, right click on the certificate for your local machine and export it to a .cer file somewhere.

Run the above script on it like so:

./rdscert *.cer

# or, if it's in your $PATH
rdscert *.cer