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Apache/Rails: Forwarding PKI

I have a Linux/Apache/Rails stack hosting a data service. The data service is basically a front end for multiple data sources, akin to a federated search.

Queries to the service are authenticated via PKI. When handling each request, the PKI must be forwarded to each data source appropriate for the given request - each data source uses the PKI to control data access.

I know how to access the requestor's DN from Rails, but I haven't the first clue how to access the PKI or pass it along in web requests launched by the controller when handling the request. Any suggestions?

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