[Solved]OpenVPN 2.5.0 - Bat problem

vandreytrindade

Hi!
I'm trying to use a bat file to run when the user connects to the VPN.
I've been testing on my own ovpn file.
Added this two lines to it:

script-security 2
up "C:\\Temp\\OpenVPN.bat"

Then the bat file has this content:

net use * /delete /y
net use P: \\srvad\folder1
net use S: \\srvad\folder2
net use T: \\srvad\folder3
net use V: \\srvad\folder4
net use Z: \\srvad\folder5

And it isn't running, if I test with only one line, the connection even start, it says that there is a problem on the bat file.
I've used that commands without configuring the bat file and after the connection, it works fine.
My friend tried the same bat file on version 2.4.9 and it works as expected.

TinCanTech

OpenVPN does not allow scripts executed by openvpn to pass data over the VPN.

vandreytrindade

Hi TinCanTech,

It is a new thing then?
On version 2.4.9 it works.
Or maybe I'm trying to do it using a bad method.
Since my domain computers aren't authenticatin as users logon, I need to be able to map some network shared folders on their computers.

TinCanTech

vandreytrindade wrote It is a new thing then?
On version 2.4.9 it works.

It is not new and was also the same in 2.4.9

vandreytrindade

Hi,
What I'm trying to do is exactly this:
https://think.unblog.ch/en/openvpn-connection-script/

TinCanTech

vandreytrindade wrote Hi,
On this blog they said that it worked (date:24/12/2020):
https://think.unblog.ch/en/openvpn-connection-script/

They are incorrect.

vandreytrindade wrote So... it changed or it was fixed to not work like that anymore?

OpenVPN has never allowed openvpn-scripts (eg. --up) to pass data over the VPN.

TinCanTech

It turns out that I am actually wrong.

Using the Windows-GUI allows a considerably weaker "security policy" (and I use that term with disgust),
and so, your script should be able to complete successfully but only if you use the Windows GUI.

I had to test it myself before I would believe it .... :shock:

But this only works if you use the method described in your blog post above.

vandreytrindade

Hi TinCanTech,

No problem!
Correct, we are using the Windows GUI.
I'm talking to the person of that blog and the only difference in our scenarios is that he uses dev TUN.
Our OpenVPN server is configured to use dev TAP.
Maybe that's the problem?

TinCanTech

No, you must use the method they describe. You cannot put the --up script into the config file itself.

vandreytrindade

Yup, I have followed the same steps as he did.
No modifcation of the ovpn file.

My files on C:\Users\Vandrey\OpenVPN\config are:
VPNConfig.ovpn
VPNConfig_up.bat

My bat file runs if I use the message box like he did, or simple things like: echo "a" > C:\Temp\1.txt
But never "net use"...
Is there any log to see why it isn't working?
Have tried to set log verbose to 4 and still no log to show why net use isn't working for me.

TinCanTech

You may be able to find some useful debugging examples here:
https://github.com/TinCanTech/easy-tls

See the batch files.

vandreytrindade

Hi TinCanTech,

Thanks a lot for your time and attention.
I have found the problem.
My network password is between %, so when I pass the credentials on the bat file it's returning an error because it removes the % characters from the password.
I have tested on a domain joined machine where I don't need to pass credentials and it worked as expected.

i solved by using double % to escape them.

Thanks once again!!! 😃

PS: I haven't found a way to edit this post as solved...

TinCanTech

Thanks to your persistence, I found out about the GUI functioning differently to a config. 8-)

Thanks for your star on github, I hope you find Easy-TLS as useful as I do.

Yeah, you can't edit posts after a certain amount of time. A mod may do that for you.

Cheers!