I am creating a website and my company feels accessing active directory from internet can be a security threat. I would like the users to be able to log in using Active Directory Credential. Is there a secure way to do that?
2 Answers
I think that Active Directory Federation Services might be what you're looking for. Specifically the "Web Single Sign On" functionality.
Since you've tagged with question with "insecure-connection" I feel I must add that you should not, under any circumstances let user account data flow in to or out from your company's firewall un-encrypted.

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Active Directory Federation Services (ADFS) is based on the emerging, industry-supported Web Services Architecture, which is defined in WS-* specifications. ADFS helps you use single sign-on (SS0) to authenticate users to multiple, related Web applications over the life of a single online session. ADFS accomplishes this by securely sharing digital identity and entitlement rights across security and enterprise boundaries.
http://technet.microsoft.com/en-us/library/cc736690%28v=WS.10%29.aspx

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