microsoft certificate services

Hello Experts,

Scenario: a Public Key infrastructure running Microsoft services. The ROOT CA is internal to the network.
The internal network is all windows 7 workstations and need a client side cert pushed out so they can use that to authenticate to servers that are PKI aware and the apps are set for certificate authentication.

Question (1): Would it be better to issue a user or pc certificate in this scenario?
Question (2): If it is a PC cert, would each workstation need to send a CSR to the CA?
Question (3):  If a PC cert, can a cert simply be extracted from the user's certificate store and imported into a non company device for use?  Am I correct to say that without the private key and the password for the key, they cannot even export the cert.
trojan81Asked:
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arnoldCommented:
When the computer needs to secure communications, it uses the computer certificate. When user needs to authenticate using a certificate the user needs a user certificate.

There is an autoenroll option in a GPO for both Computer and user configurations.

One can not use a user certificate for a computer certificate, they are two separate things.
No, a user accessing their certificate can export their certificate and the private key at which point they will be offered an option to secure this information by including a password to the exported certificate/public key combination.
A user without administrative rights will not be able to access the computer's certificate store to extract/export the computer certificate.

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trojan81Author Commented:
Arnold,

thank you for  responding. I want to now focus on the exporting of the cert.  If I enroll for a computer cert, you say that I have the option to make the key NON exportable? If it is non exportable, then I won't need to secure it with a password, is that correct?  
Would it be the Issuing CA's job to make the CERT non exportable or will it be the client?

Lastly, if the cert is exportable but the key is not, would a malicious user be able to install and use the cert?
arnoldCommented:
You would need to see whether you can within autoenroll define the key as non-exportable.
A regular user does not have access rights to the certificate store of the computer or services who can also have/use certificates.
The cert is a public reference and is viewable/exportable.
The only time a password is stored on a key is when one is exporting their certificate with the key. That process allows for setting a password to secure the resulting file (.pfx) to prevent a person without the password from adding the .......

When you say you enroll, you mean you go through the web interface of the CA server and request a computer certificate for the computer?


Look at autoenroll and autoenrollment GPO
https://technet.microsoft.com/en-us/library/cc947849%28v=ws.10%29.aspx
https://technet.microsoft.com/en-us/library/cc731522.aspx
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