xds: honor requested_server_name from TLS SNI#12771
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1seal wants to merge 1 commit intogrpc:masterfrom
Draft
xds: honor requested_server_name from TLS SNI#127711seal wants to merge 1 commit intogrpc:masterfrom
1seal wants to merge 1 commit intogrpc:masterfrom
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Read requested_server_name from the TLS SNI on ExtendedSSLSession so RBAC policies can match the value Envoy config provides. Add a regression test covering a deny policy that depends on the requested server name.
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what changed
requested_server_namefrom the TLS SNI exposed byExtendedSSLSessionwhy
RequestedServerNameMatcherwas wired through the xDS RBAC engine, butGrpcAuthorizationEnginealways returned an empty string forrequested_server_name. That made policies depending on this field ineffective and could allow traffic that should have matched a deny policy.impact
xDS RBAC policies that use
requested_server_namenow evaluate against the SNI the client presented during the TLS handshake instead of always seeing an empty value.validation
./gradlew --no-daemon --console=plain --info -PskipAndroid=true -PskipCodegen=true :grpc-xds:test --tests 'io.grpc.xds.internal.rbac.engine.GrpcAuthorizationEngineTest.requestedServerNameMatcher_matchesTlsSni'