feat: add PSK for external provisionerd auth (#8877)

Signed-off-by: Spike Curtis <spike@coder.com>

cli/root.go

@@ -494,6 +494,15 @@ func addTelemetryHeader(client *codersdk.Client, inv *clibase.Invocation) {
 // InitClient sets client to a new client.
 // It reads from global configuration files if flags are not set.
 func (r *RootCmd) InitClient(client *codersdk.Client) clibase.MiddlewareFunc {
+	return r.initClientInternal(client, false)
+}
+
+func (r *RootCmd) InitClientMissingTokenOK(client *codersdk.Client) clibase.MiddlewareFunc {
+	return r.initClientInternal(client, true)
+}
+
+// nolint: revive
+func (r *RootCmd) initClientInternal(client *codersdk.Client, allowTokenMissing bool) clibase.MiddlewareFunc {
 	if client == nil {
 		panic("client is nil")
 	}
@@ -508,7 +517,7 @@ func (r *RootCmd) InitClient(client *codersdk.Client) clibase.MiddlewareFunc {
 				rawURL, err := conf.URL().Read()
 				// If the configuration files are absent, the user is logged out
 				if os.IsNotExist(err) {
-					return (errUnauthenticated)
+					return errUnauthenticated
 				}
 				if err != nil {
 					return err
@@ -524,9 +533,10 @@ func (r *RootCmd) InitClient(client *codersdk.Client) clibase.MiddlewareFunc {
 				r.token, err = conf.Session().Read()
 				// If the configuration files are absent, the user is logged out
 				if os.IsNotExist(err) {
-					return (errUnauthenticated)
-				}
-				if err != nil {
+					if !allowTokenMissing {
+						return errUnauthenticated
+					}
+				} else if err != nil {
 					return err
 				}
 			}

cli/testdata/coder_server_--help.golden

@@ -373,6 +373,10 @@ updating, and deleting workspace resources.
       --provisioner-daemon-poll-jitter duration, $CODER_PROVISIONER_DAEMON_POLL_JITTER (default: 100ms)
           Random jitter added to the poll interval.
 
+      --provisioner-daemon-psk string, $CODER_PROVISIONER_DAEMON_PSK
+          Pre-shared key to authenticate external provisioner daemons to Coder
+          server.
+
       --provisioner-daemons int, $CODER_PROVISIONER_DAEMONS (default: 3)
           Number of provisioner daemons to create on start. If builds are stuck
           in queued state for a long time, consider increasing this.

cli/testdata/server-config.yaml.golden

@@ -327,6 +327,9 @@ provisioning:
   # Time to force cancel provisioning tasks that are stuck.
   # (default: 10m0s, type: duration)
   forceCancelInterval: 10m0s
+  # Pre-shared key to authenticate external provisioner daemons to Coder server.
+  # (default: <unset>, type: string)
+  daemonPSK: ""
 # Enable one or more experiments. These are not ready for production. Separate
 # multiple experiments with commas, or enter '*' to opt-in to all available
 # experiments.