diff options
Diffstat (limited to 'pinentry-wsl-ps1.sh')
| -rw-r--r-- | pinentry-wsl-ps1.sh | 65 |
1 files changed, 56 insertions, 9 deletions
diff --git a/pinentry-wsl-ps1.sh b/pinentry-wsl-ps1.sh index 61e5a22..0a7ab00 100644 --- a/pinentry-wsl-ps1.sh +++ b/pinentry-wsl-ps1.sh @@ -1,5 +1,32 @@ -#!/bin/bash +#!/usr/bin/env bash +# pinentry-wsl-ps1 +# +# (c) 2018 Dale Phurrough +# Licensed under the Mozilla Public License 2.0 +# +# Allows GnuPG to prompt and read passphrases by the pinentry standard +# with a GUI when running within WSL (Windows Subsystem for Linux). +# Works for all keys managed by gpg-agent (GPG, SSH, etc). +# This is a drop-in GUI alternative to pinentry-curses, pinentry-gtk-2, etc. +# https://www.gnupg.org/software/pinentry/index.html +# +# Setup: +# 1. Save this script and set its permissions to be executable +# 2. Configure gpg-agent to use this script for pinentry using +# one of the following methods: +# a) Set pinentry-program within ~/.gnupg/gpg-agent.conf +# pinentry-program /mnt/c/repos/pinentry-wsl-ps1/pinentry-wsl-ps1.sh +# b) Set the path to this script when you launch gpg-agent +# gpg-agent --pinentry-program /mnt/c/repos/pinentry-wsl-ps1/pinentry-wsl-ps1.sh +# 3. Optionally enable persistence of passwords. +# Requires https://github.com/davotronic5000/PowerShell_Credential_Manager +# Please follow instructions there to install from the Gallery or GitHub. +# Note security perspectives like https://security.stackexchange.com/questions/119765/how-secure-is-the-windows-credential-manager +# Possible values for PERSISTENCE are: "", "Session", "LocalMachine", or "Enterprise" +PERSISTENCE="" + +# Do not casually edit the below values VERSION="0.1.0" TIMEOUT="0" DESCRIPTION="Enter password for GPG key" @@ -8,7 +35,6 @@ TITLE="GPG Key Credentials" CACHEPREFIX="gpgcache:" CACHEUSER="" KEYINFO="" -PERSISTANCE="Enterprise" # Session, LocalMachine, or Enterprise OKBUTTON="&OK" CANCELBUTTON="&Cancel" NOTOKBUTTON="&Do not do this" @@ -18,8 +44,8 @@ REPEATPASSWORD="0" REPEATDESCRIPTION="Confirm password for GPG key" REPEATERROR="Error: Passwords did not match." +# convert Assuan protocol error into an ERR number, e.g. echo -n $(( (5 << 24) | $1 )) assuan_result() { - #echo -n $(( (5 << 24) | $1 )) case $1 in 0) echo -n "ERR 0 no error" @@ -48,6 +74,7 @@ assuan_result() { esac } +# GUI dialogs for passwords; text is dynamically set by gpg-agent via protocol getpassword() { if [ -n $CACHEUSER ]; then local creduser="$CACHEUSER" @@ -88,7 +115,7 @@ DLM local cmd_store=$(cat <<-DLM \$pw = \$Input | Select-Object -First 1 \$securepw = ConvertTo-SecureString \$pw -AsPlainText -Force - New-StoredCredential -Target "$CACHEPREFIX$KEYINFO" -Type GENERIC -UserName "$creduser" -SecurePassword \$securepw -Persist $PERSISTANCE | + New-StoredCredential -Target "$CACHEPREFIX$KEYINFO" -Type GENERIC -UserName "$creduser" -SecurePassword \$securepw -Persist $PERSISTENCE | out-null DLM ) @@ -135,6 +162,7 @@ DLM fi } +# remove password from persistent store removepassword() { if [ -z "$1" ]; then echo "$(assuan_result 261)" @@ -151,9 +179,14 @@ removepassword() { Write-Output "OK" DLM ) - echo "$(powershell.exe -nologo -noprofile -noninteractive -command "$cmd_remove")" + if [ "$EXTPASSCACHE" == "1" ]; then + echo "$(powershell.exe -nologo -noprofile -noninteractive -command "$cmd_remove")" + else + echo "OK" + fi } +# GUI dialog box with simple message and one OK button message() { local desc if [ -n "$1" ]; then @@ -172,6 +205,7 @@ DLM echo "OK" } +# GUI dialog box with test and two buttons: OK, Cancel confirm() { PINERROR="" if [ "$1" == "--one-button" ]; then @@ -199,12 +233,15 @@ DLM echo "$result" } +# set a timeout value in seconds after which prompts/dialogs are automatically cancelled +# limited functionality in current codebase +# potential improvements at https://stackoverflow.com/questions/21176487/adding-a-timeout-to-batch-powershell settimeout() { - # https://stackoverflow.com/questions/21176487/adding-a-timeout-to-batch-powershell TIMEOUT="$1" echo "OK" } +# helper function for decoding strings from gpg-agent into Windows-compatible format decodegpgagentstr() { local decode="${1//%0A/%0D%0A}" # convert hex LF into hex Windows CRLF decode="${decode//%/\\x}" # convert hex encoding style @@ -212,6 +249,8 @@ decodegpgagentstr() { echo -n "${decode//\"/\`\"}" # escape double quotes for powershell } +# commonly used to set main text in GUI dialog boxes +# also parses for key ids to display in GUI prompts setdescription() { DESCRIPTION="$(decodegpgagentstr "$1")" local searchfor='ID ([[:xdigit:]]{16})' # hack to search for first gpg key id in description @@ -288,12 +327,15 @@ getinfo() { fi } +# often called by gpg-agent to set default values setoption() { local key="$(echo "$1" | cut -d'=' -f1)" local value="$(echo "$1" | cut -d'=' -s -f2-)" case $key in allow-external-password-cache) - EXTPASSCACHE=1 + if [ -n "$PERSISTENCE" ]; then + EXTPASSCACHE=1 + fi echo "OK" ;; default-ok) @@ -314,10 +356,15 @@ setoption() { esac } -#rm -f /home/dalep/tracepin.txt +# check that we are running within WSL +if ! cat /proc/sys/kernel/osrelease | grep -q -i Microsoft; then + echo "$(assuan_result 257)" + exit 1 +fi + +# main loop to read stdin and respond echo "OK Your orders please" while IFS= read -r line; do - #echo "$line" >> /home/dalep/tracepin.txt action="$(echo $line | cut -d' ' -f1)" args="$(echo $line | cut -d' ' -s -f2-)" case $action in |