feat: Support multiple active CAs in tctl auth export (#51298)

* Support multiple active CAs in `tctl auth export`

* Remove the ExportAuthoritiesSecrets func

* Mention path in the --out-prefix help

* Rename --out-prefix to --out

* Write script-friendly output

lib/client/ca_export.go

@@ -165,15 +165,6 @@ func ExportAuthorities(ctx context.Context, client authclient.ClientI, req Expor
 	return exportAuthorities(ctx, client, req, ExportAllAuthorities)
 }
 
-// ExportAuthoritiesSecrets is the single-authority variant of
-// [ExportAllAuthoritiesSecrets].
-// Soft-deprecated, prefer using [ExportAllAuthoritiesSecrets] and handling
-// exports with more than one authority gracefully.
-func ExportAuthoritiesSecrets(ctx context.Context, client authclient.ClientI, req ExportAuthoritiesRequest) (string, error) {
-	// TODO(codingllama): Remove ExportAuthoritiesSecrets.
-	return exportAuthorities(ctx, client, req, ExportAllAuthoritiesSecrets)
-}
-
 func exportAuthorities(
 	ctx context.Context,
 	client authclient.ClientI,

lib/client/ca_export_test.go

@@ -353,9 +353,6 @@ func TestExportAuthorities(t *testing.T) {
 			t.Run(fmt.Sprintf("%s/ExportAllAuthoritiesSecrets", tt.name), func(t *testing.T) {
 				runTest(t, ExportAllAuthoritiesSecrets, tt.assertSecrets)
 			})
-			t.Run(fmt.Sprintf("%s/ExportAuthoritiesSecrets", tt.name), func(t *testing.T) {
-				runUnaryTest(t, ExportAuthoritiesSecrets, tt.assertSecrets)
-			})
 		})
 	}
 }

tool/tctl/common/auth_command.go

@@ -123,6 +123,9 @@ func (a *AuthCommand) Initialize(app *kingpin.Application, _ *tctlcfg.GlobalCLIF
 		fmt.Sprintf("export certificate type (%v)", strings.Join(allowedCertificateTypes, ", "))).
 		EnumVar(&a.authType, allowedCertificateTypes...)
 	a.authExport.Flag("integration", "Name of the integration. Only applies to \"github\" CAs.").StringVar(&a.integration)
+	a.authExport.
+		Flag("out", "If set writes exported authorities to files with the given path prefix").
+		StringVar(&a.output)
 
 	a.authGenerate = auth.Command("gen", "Generate a new SSH keypair.").Hidden()
 	a.authGenerate.Flag("pub-key", "path to the public key").Required().StringVar(&a.genPubPath)
@@ -233,9 +236,9 @@ var allowedCRLCertificateTypes = []string{
 // If --type flag is given, only prints keys for CAs of this type, otherwise
 // prints all keys
 func (a *AuthCommand) ExportAuthorities(ctx context.Context, clt authCommandClient) error {
-	exportFunc := client.ExportAuthorities
+	exportFunc := client.ExportAllAuthorities
 	if a.exportPrivateKeys {
-		exportFunc = client.ExportAuthoritiesSecrets
+		exportFunc = client.ExportAllAuthoritiesSecrets
 	}
 
 	authorities, err := exportFunc(
@@ -252,8 +255,29 @@ func (a *AuthCommand) ExportAuthorities(ctx context.Context, clt authCommandClie
 		return trace.Wrap(err)
 	}
 
-	fmt.Println(authorities)
+	if l := len(authorities); l > 1 && a.output == "" {
+		return trace.BadParameter("found %d authorities to export, use --out to export all", l)
+	}
 
+	if a.output != "" {
+		perms := os.FileMode(0644)
+		if a.exportPrivateKeys {
+			perms = 0600
+		}
+
+		fmt.Fprintf(os.Stderr, "Writing %d files with prefix %q\n", len(authorities), a.output)
+		for i, authority := range authorities {
+			name := fmt.Sprintf("%s%d.cer", a.output, i)
+			if err := os.WriteFile(name, authority.Data, perms); err != nil {
+				return trace.Wrap(err)
+			}
+			fmt.Println(name)
+		}
+		return nil
+	}
+
+	// Only a single CA is exported if we got this far.
+	fmt.Printf("%s\n", authorities[0].Data)
 	return nil
 }