Remove the Kubernetes configuration file permissions check

See https://github.com/helm/helm/issues/13320#issuecomment-2346724311

Signed-off-by: Yarden Shoham <git@yardenshoham.com>

cmd/helm/root.go

@@ -201,9 +201,6 @@ func newRootCmd(actionConfig *action.Configuration, out io.Writer, args []string
 	// Find and add plugins
 	loadPlugins(cmd, out)
 
-	// Check permissions on critical files
-	checkPerms()
-
 	// Check for expired repositories
 	checkForExpiredRepos(settings.RepositoryConfig)
 

cmd/helm/root_unix.go

@@ -1,58 +0,0 @@
-//go:build !windows
-
-/*
-Copyright The Helm Authors.
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
-*/
-
-package main
-
-import (
-	"os"
-	"os/user"
-	"path/filepath"
-)
-
-func checkPerms() {
-	// This function MUST NOT FAIL, as it is just a check for a common permissions problem.
-	// If for some reason the function hits a stopping condition, it may panic. But only if
-	// we can be sure that it is panicking because Helm cannot proceed.
-
-	kc := settings.KubeConfig
-	if kc == "" {
-		kc = os.Getenv("KUBECONFIG")
-	}
-	if kc == "" {
-		u, err := user.Current()
-		if err != nil {
-			// No idea where to find KubeConfig, so return silently. Many helm commands
-			// can proceed happily without a KUBECONFIG, so this is not a fatal error.
-			return
-		}
-		kc = filepath.Join(u.HomeDir, ".kube", "config")
-	}
-	fi, err := os.Stat(kc)
-	if err != nil {
-		// DO NOT error if no KubeConfig is found. Not all commands require one.
-		return
-	}
-
-	perm := fi.Mode().Perm()
-	if perm&0040 > 0 {
-		warning("Kubernetes configuration file is group-readable. This is insecure. Location: %s", kc)
-	}
-	if perm&0004 > 0 {
-		warning("Kubernetes configuration file is world-readable. This is insecure. Location: %s", kc)
-	}
-}

cmd/helm/root_unix_test.go

@@ -1,82 +0,0 @@
-//go:build !windows
-
-/*
-Copyright The Helm Authors.
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
-*/
-
-package main
-
-import (
-	"bytes"
-	"io"
-	"os"
-	"path/filepath"
-	"strings"
-	"testing"
-)
-
-func checkPermsStderr() (string, error) {
-	r, w, err := os.Pipe()
-	if err != nil {
-		return "", err
-	}
-
-	stderr := os.Stderr
-	os.Stderr = w
-	defer func() {
-		os.Stderr = stderr
-	}()
-
-	checkPerms()
-	w.Close()
-
-	var text bytes.Buffer
-	io.Copy(&text, r)
-	return text.String(), nil
-}
-
-func TestCheckPerms(t *testing.T) {
-	tdir := t.TempDir()
-	tfile := filepath.Join(tdir, "testconfig")
-	fh, err := os.OpenFile(tfile, os.O_CREATE|os.O_APPEND|os.O_RDWR, 0440)
-	if err != nil {
-		t.Errorf("Failed to create temp file: %s", err)
-	}
-
-	tconfig := settings.KubeConfig
-	settings.KubeConfig = tfile
-	defer func() { settings.KubeConfig = tconfig }()
-
-	text, err := checkPermsStderr()
-	if err != nil {
-		t.Fatalf("could not read from stderr: %s", err)
-	}
-	expectPrefix := "WARNING: Kubernetes configuration file is group-readable. This is insecure. Location:"
-	if !strings.HasPrefix(text, expectPrefix) {
-		t.Errorf("Expected to get a warning for group perms. Got %q", text)
-	}
-
-	if err := fh.Chmod(0404); err != nil {
-		t.Errorf("Could not change mode on file: %s", err)
-	}
-	text, err = checkPermsStderr()
-	if err != nil {
-		t.Fatalf("could not read from stderr: %s", err)
-	}
-	expectPrefix = "WARNING: Kubernetes configuration file is world-readable. This is insecure. Location:"
-	if !strings.HasPrefix(text, expectPrefix) {
-		t.Errorf("Expected to get a warning for world perms. Got %q", text)
-	}
-}

cmd/helm/root_windows.go

@@ -1,22 +0,0 @@
-/*
-Copyright The Helm Authors.
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
-*/
-
-package main
-
-func checkPerms() {
-	// Not yet implemented on Windows. If you know how to do a comprehensive perms
-	// check on Windows, contributions welcomed!
-}