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Re: [Openvpn-users] Certificate common name & auth-user-pass-verify


  • Subject: Re: [Openvpn-users] Certificate common name & auth-user-pass-verify
  • From: Alon Bar-Lev <alon.barlev@xxxxxxxxx>
  • Date: Fri, 03 Feb 2006 18:56:14 +0200

Nuno Marques wrote:
I understand your point but using this aproach (certificate + user/pass)
has some advantages:

- Only the users that have a certificate can connect to the VPN

As I recommended, you can do that via LDAP query based on the DN of the user certificate.
If a user exist accept his session.
You don't need the user password for this verification.


- Even if the certificate is stolen, the thief will only connect if he
knows the Active Directory password

Why don't you afraid from someone steeling the password?

I recommend you explore smartcard support of OpenVPN. Smartcards have the benefit of locking themselves if someone tries to guess their password.

If you interested in protecting your network - use smartcards.

- Our AD makes users change passwd every 6 months, since the
certificates don't have password, a user that changes the password on AD
can connect without having to change certificates

Guessing a password, even if it is changed every one month (My recommendation), is a lot simpler than guessing RSA private key.
Providing the users with 2048 bit RSA key, is better than forcing them to change a password once a day.


- And more important, most our users are not used to certificates, but
are familiar with using AD, this way they don't even know they are using
certificates

Can I understand that YOU *DON'T ENCRYPT* user private key?
And you *ARE* concerned about security...
So you waken the stronger mechanism and try to compensate in trying to strengthen the weaker mechanism... Well... Good luck.


Best Regards,
Alon Bar-Lev.

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