Add back the ability to specify IP for nebula create-cert

go/cmd/entrypoint/nebula.go

@@ -6,6 +6,7 @@ import (
 	"isle/daemon"
 	"isle/jsonutil"
 	"isle/nebula"
+	"net/netip"
 	"os"
 )
 
@@ -16,6 +17,7 @@ var subCmdNebulaCreateCert = subCmd{
 		var (
 			flags    = subCmdCtx.flagSet(false)
 			hostName nebula.HostName
+			ip       netip.Addr
 		)
 
 		hostNameF := flags.VarPF(
@@ -29,6 +31,12 @@ var subCmdNebulaCreateCert = subCmd{
 			`Path to PEM file containing public key which will be embedded in the cert.`,
 		)
 
+		flags.Var(
+			textUnmarshalerFlag{&ip},
+			"ip",
+			"IP address to create a cert for. If this is not given then the IP associated with the host via its `hosts create` call will be used",
+		)
+
 		if err := flags.Parse(subCmdCtx.args); err != nil {
 			return fmt.Errorf("parsing flags: %w", err)
 		}
@@ -55,6 +63,9 @@ var subCmdNebulaCreateCert = subCmd{
 			daemon.CreateNebulaCertificateRequest{
 				HostName:                hostName,
 				HostEncryptingPublicKey: hostPub,
+				Opts: daemon.CreateNebulaCertificateOpts{
+					IP: ip,
+				},
 			},
 		)
 		if err != nil {

go/daemon/daemon.go

@@ -29,6 +29,18 @@ type CreateHostOpts struct {
 	CanCreateHosts bool
 }
 
+// CreateNebulaCertificateOpts are optional parameters to the
+// CreateNebulaCertificate method.
+type CreateNebulaCertificateOpts struct {
+
+	// IP, if given will be used for the host's IP in the created cert. If this
+	// is given then it is not required that the host have an entry in garage.
+	//
+	// TODO once `hosts create` automatically adds the host to garage this can
+	// be removed.
+	IP netip.Addr
+}
+
 // Daemon presents all functionality required for client frontends to interact
 // with isle, typically via the unix socket.
 type Daemon interface {
@@ -87,6 +99,7 @@ type Daemon interface {
 		ctx context.Context,
 		hostName nebula.HostName,
 		hostPubKey nebula.EncryptingPublicKey,
+		opts CreateNebulaCertificateOpts,
 	) (
 		nebula.Certificate, error,
 	)
@@ -735,6 +748,7 @@ func (d *daemon) CreateNebulaCertificate(
 	ctx context.Context,
 	hostName nebula.HostName,
 	hostPubKey nebula.EncryptingPublicKey,
+	opts CreateNebulaCertificateOpts,
 ) (
 	nebula.Certificate, error,
 ) {
@@ -743,9 +757,13 @@ func (d *daemon) CreateNebulaCertificate(
 	) (
 		nebula.Certificate, error,
 	) {
-		host, ok := currBootstrap.Hosts[hostName]
-		if !ok {
-			return nebula.Certificate{}, ErrHostNotFound
+		ip := opts.IP
+		if ip == (netip.Addr{}) {
+			host, ok := currBootstrap.Hosts[hostName]
+			if !ok {
+				return nebula.Certificate{}, ErrHostNotFound
+			}
+			ip = host.IP()
 		}
 
 		caSigningPrivateKey, err := getNebulaCASigningPrivateKey(
@@ -757,7 +775,7 @@ func (d *daemon) CreateNebulaCertificate(
 
 		caCreds := makeCACreds(currBootstrap, caSigningPrivateKey)
 
-		return nebula.NewHostCert(caCreds, hostPubKey, hostName, host.IP())
+		return nebula.NewHostCert(caCreds, hostPubKey, hostName, ip)
 	})
 }
 

go/daemon/rpc.go

@@ -163,6 +163,7 @@ func (r *RPC) CreateHost(
 type CreateNebulaCertificateRequest struct {
 	HostName                nebula.HostName
 	HostEncryptingPublicKey nebula.EncryptingPublicKey
+	Opts                    CreateNebulaCertificateOpts
 }
 
 // CreateNebulaCertificateResult wraps the results from the
@@ -179,7 +180,7 @@ func (r *RPC) CreateNebulaCertificate(
 	CreateNebulaCertificateResult, error,
 ) {
 	cert, err := r.daemon.CreateNebulaCertificate(
-		ctx, req.HostName, req.HostEncryptingPublicKey,
+		ctx, req.HostName, req.HostEncryptingPublicKey, req.Opts,
 	)
 	if err != nil {
 		return CreateNebulaCertificateResult{}, err