Commit 7c5c99b1 authored by Committed by Łukasz Nowak
caddy-frontend: Expose csr_id over HTTPS
csr_id is exposed over HTTPS with short living self signed certificate, which is transmitted via SlapOS Master. Thanks to this, it is possible to match csr_id with certificate of given partition and take decision if it shall be signed or not. This is "quite secure" apporach, a bit better than blidny trusting what CSR to sign in KeDiFa. The bootstrap information, which is short living (certificates are valid for 5 days), resides in SlapOS Master. The csr_id is not directly known to SlapOS Master, and shall be consumed as fast as possible by frontend cluster operator in order to sign CSR appearing in KeDiFa caucase. The known possible attack vector requires that attacker knows caucased HTTP listening port and can hijack HTTPS traffic to the csr_id-url to get the human approve his own csr_id. The second is hoped to be overcomed by publishing certificate of this endpoint via SlapOS Master. Unfortunately caucase-updater prefix is directly used to find real CSR, as the one generated is just a template for rerequest, thus csr_id would be different from really used by caucase-updater.
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