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A customer sent me a CSR and the .CER of a certificate for a linux server that I host. The customer does not have access to this machine.

Is this enough data to generate a valid certificate? Is it possible to generate the .KEY from the .CSR for a valid certificate?

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Check the contents of the files - sometimes people put the private and public keys in the same file. –  Shane Madden Nov 25 '13 at 20:10

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You can't derive the private key from the certificate (signed public key) or the certificate signing request. If you could, the crypto would be utterly useless.

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