Workload Identity: Add minimally viable implementation of IssueWorklo…

…adIdentity RPC (#49943)

* Add MVP implementation of IssueWorkloadIdentity endpoint

* Add experiment flag

* Fix TTL shadowing

* Support some non-string attributes for rules and templatin

* Adjust regex with @timothyb89 's suggestions

* Add note on deny rules

lib/auth/grpcserver.go

@@ -5186,6 +5186,23 @@ func NewGRPCServer(cfg GRPCServerConfig) (*GRPCServer, error) {
 	}
 	workloadidentityv1pb.RegisterWorkloadIdentityResourceServiceServer(server, workloadIdentityResourceService)
 
+	clusterName, err := cfg.AuthServer.GetClusterName()
+	if err != nil {
+		return nil, trace.Wrap(err, "getting cluster name")
+	}
+	workloadIdentityIssuanceService, err := workloadidentityv1.NewIssuanceService(&workloadidentityv1.IssuanceServiceConfig{
+		Authorizer:  cfg.Authorizer,
+		Cache:       cfg.AuthServer.Cache,
+		Emitter:     cfg.Emitter,
+		Clock:       cfg.AuthServer.GetClock(),
+		KeyStore:    cfg.AuthServer.keyStore,
+		ClusterName: clusterName.GetClusterName(),
+	})
+	if err != nil {
+		return nil, trace.Wrap(err, "creating workload identity issuance service")
+	}
+	workloadidentityv1pb.RegisterWorkloadIdentityIssuanceServiceServer(server, workloadIdentityIssuanceService)
+
 	dbObjectImportRuleService, err := dbobjectimportrulev1.NewDatabaseObjectImportRuleService(dbobjectimportrulev1.DatabaseObjectImportRuleServiceConfig{
 		Authorizer: cfg.Authorizer,
 		Backend:    cfg.AuthServer.Services,

lib/auth/machineid/workloadidentityv1/experiment/experiment.go

@@ -0,0 +1,41 @@
+// Teleport
+// Copyright (C) 2024 Gravitational, Inc.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package experiment
+
+import (
+	"os"
+	"sync"
+)
+
+var mu sync.Mutex
+
+var experimentEnabled = os.Getenv("TELEPORT_WORKLOAD_IDENTITY_UX_EXPERIMENT") == "1"
+
+// Enabled returns true if the workload identity UX experiment is
+// enabled.
+func Enabled() bool {
+	mu.Lock()
+	defer mu.Unlock()
+	return experimentEnabled
+}
+
+// SetEnabled sets the experiment enabled flag.
+func SetEnabled(enabled bool) {
+	mu.Lock()
+	defer mu.Unlock()
+	experimentEnabled = enabled
+}