Server Fault is a question and answer site for system and network administrators. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

i'm looking for opensource 2 factor authentication service. (Right now we're using openLDAP.)

We're just using Linux Servers. That's why the service should work well with PAM Linux.

It would also be nice to have 2 factor authentication support for Dell's iDrac and Cisco.

Thanks in advance for any links :-)

share|improve this question

closed as off-topic by Michael Hampton Oct 17 '14 at 20:48

This question appears to be off-topic. The users who voted to close gave this specific reason:

If this question can be reworded to fit the rules in the help center, please edit the question.

up vote 3 down vote accepted

OpenOTP is a solution.

share|improve this answer
i will take your answer as the correct one, although the core componenent (otp-server) isn't opensource... but this server has a lot of features... thank you for this great link! :-) – JMW Sep 18 '11 at 23:36
No problem. I looked into this briefly, but never implemented it here. It'd be interesting to see if you could utilize this solution with Windows Logon... probably by "side-loading" a module into AD. – mbrownnyc Sep 19 '11 at 16:53

Google Authenticator can be installed as a PAM module. We've had good results with it. The smartphone apps are free and open source, as well.

share|improve this answer

Duosecurity provides a two-factor authentication service. It works with mobiles phones as hardware token, but it seems that you can't run your own server.

If I remember correctly, the client-side is opensource. It works with pam, juniper and cisco's ssl vpn, and others.

I liked a lot the push request on the phone with their android/iphone app :)

share|improve this answer

We have an open-source two-factor authentication option:


share|improve this answer

Still looking?

privacyidea is the open source solution. It is a fork of LinOTP. privacyidea is hosted at github, discussed at github and issues are kept at github to give you best transparency.

share|improve this answer

Not the answer you're looking for? Browse other questions tagged or ask your own question.