Role Based Access Control (RBAC) Filter¶
The RBAC filter is used to authorize actions (permissions) by identified downstream clients (principals). This is useful to explicitly manage callers to an application and protect it from unexpected or forbidden agents. The filter supports configuration with either a safe-list (ALLOW) or block-list (DENY) set of policies based off properties of the connection (IPs, ports, SSL subject) as well as the incoming request’s HTTP headers. This filter also supports policy in both enforcement and shadow mode, shadow mode won’t effect real users, it is used to test that a new set of policies work before rolling out to production.
When a request is denied, the RESPONSE_CODE_DETAILS will include the name of the matched policy that caused the deny in the format of rbac_access_denied_matched_policy[policy_name] (policy_name will be none if no policy matched), this helps to distinguish the deny from Envoy RBAC filter and the upstream backend.
This filter should be configured with the name envoy.filters.http.rbac.
Per-Route Configuration¶
The RBAC filter configuration can be overridden or disabled on a per-route basis by providing a RBACPerRoute configuration on the virtual host, route, or weighted cluster.
Statistics¶
The RBAC filter outputs statistics in the http.<stat_prefix>.rbac. namespace. The stat prefix comes from the owning HTTP connection manager.
Name |
Type |
Description |
---|---|---|
allowed |
Counter |
Total requests that were allowed access |
denied |
Counter |
Total requests that were denied access |
shadow_allowed |
Counter |
Total requests that would be allowed access by the filter’s shadow rules |
shadow_denied |
Counter |
Total requests that would be denied access by the filter’s shadow rules |
logged |
Counter |
Total requests that should be logged |
not_logged |
Counter |
Total requests that should not be logged |
Dynamic Metadata¶
The RBAC filter emits the following dynamic metadata.
Name |
Type |
Description |
---|---|---|
shadow_effective_policy_id |
string |
The effective shadow policy ID matching the action (if any). |
shadow_engine_result |
string |
The engine result for the shadow rules (i.e. either allowed or denied). |
access_log_hint |
boolean |
Whether the request should be logged. This metadata is shared and set under the key namespace ‘envoy.common’ (See Shared Dynamic Metadata). |