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Apache: Trusting a single certificate with SSLCACertificateFile.

+4 votes
127 views

We want to set up SSL client authentication and we will only have a single client that we want to allow through to the website.

Is it possible to allow just a single certificate to authenticate by just specifying that one cert in SSLCACertificateFile? i.e. without specifying the CA cert instead?

If so, would my SSLVerifyDepth then be zero?

Are there any reasons I might not have thought about why this isn't a good idea or any other considerations?

posted Oct 30, 2013 by Ahmed Patel

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+3 votes

I have Apache 2.4 (win32) and have the following in my CA bundle.

Root 1
Subordinate 1
Subordinate 2

My server was signed off Subordinate 1, When I do openssl s_client -connect server:443, it shows both Subordinate 1 and Subordinate 2 in the acceptable CA names.

If I remove Subordinate 2 from the bundle, It only shows Subordinate 1 as a acceptable CA. However, if I remove Subordinate 1, it still shows as an acceptable CA.

It seems httpd references not only cabundle/cafiles but also certs in the Chain file. as acceptable CAs.

Is it possible to prevent a user signed off Subordinate 1 from using client certificate authentication while the server cert is issued off Subordinate 1?

+1 vote

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I have added force_ssl in ApplicationController. Then thin start --ssl. It took me to https, but with red cross. i.e. Not trusted site.

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