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Client TLS authentication filter architecture overview
This filter should be configured with the name envoy.filters.network.client_ssl_auth.
Statistics
Every configured client TLS authentication filter has statistics rooted at auth.clientssl.<stat_prefix>. with the following statistics:
Name | Type | Description |
|---|---|---|
update_success | Counter | Total principal update successes |
update_failure | Counter | Total principal update failures |
auth_no_ssl | Counter | Total connections ignored due to no TLS |
auth_ip_allowlist | Counter | Total connections allowed due to the IP allowlist |
auth_digest_match | Counter | Total connections allowed due to certificate match |
auth_digest_no_match | Counter | Total connections denied due to no certificate match |
total_principals | Gauge | Total loaded principals |
REST API
GET /v1/certs/list/approved
The authentication filter will call this API every refresh interval to fetch the current list of approved certificates/principals. The expected JSON response looks like:
{"certificates": []}
certificates
(required, array) list of approved certificates/principals.
Each certificate object is defined as:
{"fingerprint_sha256": "...",}
fingerprint_sha256
(required, string) The SHA256 hash of the approved client certificate. Envoy will match this hash to the presented client certificate to determine whether there is a digest match.
