From 24830f4cfad3c935fce306dcdb6bd65d473af1af Mon Sep 17 00:00:00 2001
From: Mitchell Hashimoto <mitchell.hashimoto@gmail.com>
Date: Fri, 16 Mar 2018 21:28:27 -0700
Subject: [PATCH] agent/consul: RPC endpoints to list roots

---
 agent/consul/connect_ca_endpoint.go | 55 +++++++++++++++++++++++++++++
 agent/consul/server_oss.go          |  1 +
 2 files changed, 56 insertions(+)
 create mode 100644 agent/consul/connect_ca_endpoint.go

diff --git a/agent/consul/connect_ca_endpoint.go b/agent/consul/connect_ca_endpoint.go
new file mode 100644
index 000000000..3f35ad79f
--- /dev/null
+++ b/agent/consul/connect_ca_endpoint.go
@@ -0,0 +1,55 @@
+package consul
+
+import (
+	"github.com/hashicorp/consul/agent/consul/state"
+	"github.com/hashicorp/consul/agent/structs"
+	"github.com/hashicorp/go-memdb"
+)
+
+// ConnectCA manages the Connect CA.
+type ConnectCA struct {
+	// srv is a pointer back to the server.
+	srv *Server
+}
+
+// Roots returns the currently trusted root certificates.
+func (s *ConnectCA) Roots(
+	args *structs.DCSpecificRequest,
+	reply *structs.IndexedCARoots) error {
+	// Forward if necessary
+	if done, err := s.srv.forward("ConnectCA.Roots", args, args, reply); done {
+		return err
+	}
+
+	return s.srv.blockingQuery(
+		&args.QueryOptions, &reply.QueryMeta,
+		func(ws memdb.WatchSet, state *state.Store) error {
+			index, roots, err := state.CARoots(ws)
+			if err != nil {
+				return err
+			}
+
+			reply.Index, reply.Roots = index, roots
+			if reply.Roots == nil {
+				reply.Roots = make(structs.CARoots, 0)
+			}
+
+			// The API response must NEVER contain the secret information
+			// such as keys and so on. We use a whitelist below to copy the
+			// specific fields we want to expose.
+			for i, r := range reply.Roots {
+				// IMPORTANT: r must NEVER be modified, since it is a pointer
+				// directly to the structure in the memdb store.
+
+				reply.Roots[i] = &structs.CARoot{
+					ID:        r.ID,
+					Name:      r.Name,
+					RootCert:  r.RootCert,
+					RaftIndex: r.RaftIndex,
+				}
+			}
+
+			return nil
+		},
+	)
+}
diff --git a/agent/consul/server_oss.go b/agent/consul/server_oss.go
index e633c2699..016420476 100644
--- a/agent/consul/server_oss.go
+++ b/agent/consul/server_oss.go
@@ -4,6 +4,7 @@ func init() {
 	registerEndpoint(func(s *Server) interface{} { return &ACL{s} })
 	registerEndpoint(func(s *Server) interface{} { return &Catalog{s} })
 	registerEndpoint(func(s *Server) interface{} { return NewCoordinate(s) })
+	registerEndpoint(func(s *Server) interface{} { return &ConnectCA{s} })
 	registerEndpoint(func(s *Server) interface{} { return &Health{s} })
 	registerEndpoint(func(s *Server) interface{} { return &Intention{s} })
 	registerEndpoint(func(s *Server) interface{} { return &Internal{s} })