* [PATCH] wireguard-tools: contrib/reresolve-dns script for Windows Powershell
@ 2021-11-23 9:59 Max Schulze
2021-11-23 10:14 ` [PATCH v2] " Max Schulze
0 siblings, 1 reply; 3+ messages in thread
From: Max Schulze @ 2021-11-23 9:59 UTC (permalink / raw)
To: wireguard
This is a script I use on windows for dynamic DNS endpoints ("servers").
The big upside is that it supports multiple configurations and does not
need hard-coded endpoints or "ping-endpoints".
I would like to apply to get it included into wireguard-tools.
I have tested this in win7 and win10. You might add it to the task
scheduler and run this every 3 minutes or so.
Some care has to be taken as to know which user is running the script.
The encrypted dpapi-binary file can only be read by the same user that
created/saved the tunnels, i.e. \system.
To make it easy to maintain this patch, I have tried to stick it as
close to the linux version as possible. Jason, feel free to modify the
copyright header as appropriate.
I am in no way the powershell guru, this is more trial-and-error.
NB: Why the limit to 15 chars in the Interface name? Mine had more, thus
setting the arbitrary (?) limit to 18 chars.
Signed-off-by: Max Schulze <max.schulze@online.de>
---
contrib/reresolve-dns/reresolve-dns.ps1 | 57 +++++++++++++++++++++++++
1 file changed, 57 insertions(+)
create mode 100644 contrib/reresolve-dns/reresolve-dns.ps1
diff --git a/contrib/reresolve-dns/reresolve-dns.ps1
b/contrib/reresolve-dns/reresolve-dns.ps1
new file mode 100644
index 0000000..951eb33
--- /dev/null
+++ b/contrib/reresolve-dns/reresolve-dns.ps1
@@ -0,0 +1,57 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Copyright (C) 2021 Max Schulze. All Rights Reserved.
+# near-literal Translation of the linux version by Jason A. Donenfeld
+
+# to decrypt the dpapi Credentials, you have to be the same user as the
wireguard tunnel service, i.e. "nt authority\system", check with "whoami"
+# this script might be called by task scheduler as
+# powershell -NoProfile -NoLogo -NonInteractive -ExecutionPolicy
Bypass -Command "Get-ChildItem -File 'c:\program
Files\wireguard\data\configurations\*.dpapi' | foreach {& C:\<path to
script>\wireguard_reresolve-dns.ps1 $_.FullName}"
+# if you want to try it in cmd, remember to elevate the user, i.e. with
psexec from sysutils
+# psexec -s -i powershell -NoPr...
+
+Set-StrictMode -Version 3
+Add-Type -AssemblyName System.Security
+
+Set-Variable CONFIG_FILE -Value $args[0].ToString().Trim('"')
+
+$byteCrypted = ((Get-Content -LiteralPath $CONFIG_FILE -Encoding Byte
-ReadCount 0))
+
+$config =
[System.Security.Cryptography.ProtectedData]::Unprotect($byteCrypted,$null,[System.Security.Cryptography.DataProtectionScope]::LocalMachine)
+
+$config = [System.Text.UTF8Encoding]::UTF8.GetString($config)
+
+Set-Variable Interface -Option Constant -Value $(if ($CONFIG_FILE
-match '.?([a-zA-Z0-9_=+.-]{1,18})\.conf.dpapi$') { $matches[1] } else {
$null })
+
+function process_peer () {
+ if (-not $PEER_SECTION -or ($PUBLIC_KEY -eq $null) -or ($ENDPOINT -eq
$null)) { return }
+ if (-not ((& wg show "$INTERFACE" latest-handshakes) -replace
$PUBLIC_KEY -match ('[0-9]+'))) { return }
+ if (((Get-Date) - (New-Object -Type DateTime -ArgumentList
1970,1,1,0,0,0,0).AddSeconds($matches[0]).ToLocalTime()).TotalSeconds
-le 135) { return }
+ (& wg set "$INTERFACE" peer "$PUBLIC_KEY" endpoint "$ENDPOINT")
+ reset_peer_section
+}
+
+function reset_peer_section () {
+ Set-Variable PEER_SECTION -Value $null
+ Set-Variable PUBLIC_KEY -Value $null
+ Set-Variable ENDPOINT -Value $null
+}
+
+reset_peer_section
+Set-Variable PEER_SECTION -Value $null
+
+foreach ($line in
$config.Split([Environment]::NewLine,[StringSplitOptions]::RemoveEmptyEntries))
{
+ if ($line.Trim().length -gt 0) {
+ $stripped = $line.Trim() -ireplace '\#.*'
+ $key = $stripped -ireplace '=.*'; $key = $key.Trim()
+ $val = $stripped -ireplace '^.*?='; $val = $val.Trim()
+ if ($key -match '\[.*') { process_peer; reset_peer_section; }
+ if ($key -eq '[Peer]') { $PEER_SECTION = $true }
+ if ($PEER_SECTION) {
+ switch ($key) {
+ "PublicKey" { $PUBLIC_KEY = $val; continue; }
+ "Endpoint" { $ENDPOINT = $val; continue; }
+ }
+ }
+ }
+}
+process_peer
--
2.33.1
^ permalink raw reply related [flat|nested] 3+ messages in thread* Re: [PATCH v2] wireguard-tools: contrib/reresolve-dns script for Windows Powershell
2021-11-23 9:59 [PATCH] wireguard-tools: contrib/reresolve-dns script for Windows Powershell Max Schulze
@ 2021-11-23 10:14 ` Max Schulze
2021-11-23 13:27 ` Christoph Loesch
0 siblings, 1 reply; 3+ messages in thread
From: Max Schulze @ 2021-11-23 10:14 UTC (permalink / raw)
To: wireguard
v2: Resend as-is, patch got garbled by thunderbird -.-
This is a script I use on windows for dynamic DNS endpoints ("servers").
The big upside is that it supports multiple configurations and does not need hard-coded endpoints or "ping-endpoints".
I would like to apply to get it included into wireguard-tools.
I have tested this in win7 and win10. You might add it to the task scheduler and run this every 3 minutes or so.
Some care has to be taken as to know which user is running the script. The encrypted dpapi-binary file can only be read by the same user that created/saved the tunnels, i.e. \system.
To make it easy to maintain this patch, I have tried to stick it as close to the linux version as possible. Jason, feel free to modify the copyright header as appropriate.
I am in no way the powershell guru, this is more trial-and-error.
NB: Why the limit to 15 chars in the Interface name? Mine had more, thus setting the arbitrary (?) limit to 18 chars.
Signed-off-by: Max Schulze <max.schulze@online.de>
---
contrib/reresolve-dns/reresolve-dns.ps1 | 57 +++++++++++++++++++++++++
1 file changed, 57 insertions(+)
create mode 100644 contrib/reresolve-dns/reresolve-dns.ps1
diff --git a/contrib/reresolve-dns/reresolve-dns.ps1 b/contrib/reresolve-dns/reresolve-dns.ps1
new file mode 100644
index 0000000..951eb33
--- /dev/null
+++ b/contrib/reresolve-dns/reresolve-dns.ps1
@@ -0,0 +1,57 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Copyright (C) 2021 Max Schulze. All Rights Reserved.
+# near-literal Translation of the linux version by Jason A. Donenfeld
+
+# to decrypt the dpapi Credentials, you have to be the same user as the wireguard tunnel service, i.e. "nt authority\system", check with "whoami"
+# this script might be called by task scheduler as
+# powershell -NoProfile -NoLogo -NonInteractive -ExecutionPolicy Bypass -Command "Get-ChildItem -File 'c:\program Files\wireguard\data\configurations\*.dpapi' | foreach {& C:\<path to script>\wireguard_reresolve-dns.ps1 $_.FullName}"
+# if you want to try it in cmd, remember to elevate the user, i.e. with psexec from sysutils
+# psexec -s -i powershell -NoPr...
+
+Set-StrictMode -Version 3
+Add-Type -AssemblyName System.Security
+
+Set-Variable CONFIG_FILE -Value $args[0].ToString().Trim('"')
+
+$byteCrypted = ((Get-Content -LiteralPath $CONFIG_FILE -Encoding Byte -ReadCount 0))
+
+$config = [System.Security.Cryptography.ProtectedData]::Unprotect($byteCrypted,$null,[System.Security.Cryptography.DataProtectionScope]::LocalMachine)
+
+$config = [System.Text.UTF8Encoding]::UTF8.GetString($config)
+
+Set-Variable Interface -Option Constant -Value $(if ($CONFIG_FILE -match '.?([a-zA-Z0-9_=+.-]{1,18})\.conf.dpapi$') { $matches[1] } else { $null })
+
+function process_peer () {
+ if (-not $PEER_SECTION -or ($PUBLIC_KEY -eq $null) -or ($ENDPOINT -eq $null)) { return }
+ if (-not ((& wg show "$INTERFACE" latest-handshakes) -replace $PUBLIC_KEY -match ('[0-9]+'))) { return }
+ if (((Get-Date) - (New-Object -Type DateTime -ArgumentList 1970,1,1,0,0,0,0).AddSeconds($matches[0]).ToLocalTime()).TotalSeconds -le 135) { return }
+ (& wg set "$INTERFACE" peer "$PUBLIC_KEY" endpoint "$ENDPOINT")
+ reset_peer_section
+}
+
+function reset_peer_section () {
+ Set-Variable PEER_SECTION -Value $null
+ Set-Variable PUBLIC_KEY -Value $null
+ Set-Variable ENDPOINT -Value $null
+}
+
+reset_peer_section
+Set-Variable PEER_SECTION -Value $null
+
+foreach ($line in $config.Split([Environment]::NewLine,[StringSplitOptions]::RemoveEmptyEntries)) {
+ if ($line.Trim().length -gt 0) {
+ $stripped = $line.Trim() -ireplace '\#.*'
+ $key = $stripped -ireplace '=.*'; $key = $key.Trim()
+ $val = $stripped -ireplace '^.*?='; $val = $val.Trim()
+ if ($key -match '\[.*') { process_peer; reset_peer_section; }
+ if ($key -eq '[Peer]') { $PEER_SECTION = $true }
+ if ($PEER_SECTION) {
+ switch ($key) {
+ "PublicKey" { $PUBLIC_KEY = $val; continue; }
+ "Endpoint" { $ENDPOINT = $val; continue; }
+ }
+ }
+ }
+}
+process_peer
--
2.33.1
^ permalink raw reply related [flat|nested] 3+ messages in thread* Re: [PATCH v2] wireguard-tools: contrib/reresolve-dns script for Windows Powershell
2021-11-23 10:14 ` [PATCH v2] " Max Schulze
@ 2021-11-23 13:27 ` Christoph Loesch
0 siblings, 0 replies; 3+ messages in thread
From: Christoph Loesch @ 2021-11-23 13:27 UTC (permalink / raw)
To: wireguard
Hi,
Am 23.11.2021 um 11:14 schrieb Max Schulze:
> NB: Why the limit to 15 chars in the Interface name? Mine had more, thus setting the arbitrary (?) limit to 18 chars.
as Aaron Jones pointed out in my thread "Android app: length of name":
on Linux, the length of an interface name (e.g. "eth0") is limited to 15 characters
Kind regards,
Christoph
^ permalink raw reply [flat|nested] 3+ messages in thread
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2021-11-23 10:14 ` [PATCH v2] " Max Schulze
2021-11-23 13:27 ` Christoph Loesch
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