fix: add permission check to argocd-cli

cmd/argocd/commands/context_test.go

@@ -5,9 +5,9 @@ import (
 	"os"
 	"testing"
 
-	"github.com/stretchr/testify/assert"
-
 	"github.com/argoproj/argo-cd/v2/util/localconfig"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 )
 
 const testConfig = `contexts:
@@ -44,6 +44,8 @@ func TestContextDelete(t *testing.T) {
 	err := ioutil.WriteFile(testConfigFilePath, []byte(testConfig), os.ModePerm)
 	assert.NoError(t, err)
 
+	err = os.Chmod(testConfigFilePath, 0600)
+	require.NoError(t, err, "Could not change the file permission to 0600 %v", err)
 	localConfig, err := localconfig.ReadLocalConfig(testConfigFilePath)
 	assert.NoError(t, err)
 	assert.Equal(t, localConfig.CurrentContext, "localhost:8080")

util/localconfig/localconfig.go

@@ -2,13 +2,12 @@ package localconfig
 
 import (
 	"fmt"
+	"github.com/golang-jwt/jwt/v4"
 	"os"
 	"os/user"
 	"path"
 	"strings"
 
-	"github.com/golang-jwt/jwt/v4"
-
 	configUtil "github.com/argoproj/argo-cd/v2/util/config"
 )
 
@@ -79,6 +78,15 @@ func (u *User) Claims() (*jwt.RegisteredClaims, error) {
 func ReadLocalConfig(path string) (*LocalConfig, error) {
 	var err error
 	var config LocalConfig
+
+	// check file permission only when argocd config exists
+	if fi, err := os.Stat(path); err == nil {
+		err = getFilePermission(fi)
+		if err != nil {
+			return nil, err
+		}
+	}
+
 	err = configUtil.UnmarshalLocalFile(path, &config)
 	if os.IsNotExist(err) {
 		return nil, nil
@@ -303,3 +311,11 @@ func GetUsername(subject string) string {
 	}
 	return subject
 }
+
+func getFilePermission(fi os.FileInfo) error {
+	if fi.Mode().Perm() == 0600 || fi.Mode().Perm() == 0400 {
+		return nil
+	}
+	return fmt.Errorf("config file has incorrect permission flags:%s."+
+		"change the file permission either to 0400 or 0600.", fi.Mode().Perm().String())
+}

util/localconfig/localconfig_test.go

@@ -1,6 +1,11 @@
 package localconfig
 
 import (
+	"fmt"
+	"github.com/stretchr/testify/require"
+	"os"
+	"path"
+	"path/filepath"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
@@ -11,3 +16,76 @@ func TestGetUsername(t *testing.T) {
 	assert.Equal(t, "admin", GetUsername("admin"))
 	assert.Equal(t, "", GetUsername(""))
 }
+
+func TestFilePermission(t *testing.T) {
+	dirPath := "testfolder/"
+
+	err := os.MkdirAll(path.Dir(dirPath), 0700)
+	require.NoError(t, err, "Could not create argocd folder with 0700 permission: %v", err)
+
+	t.Cleanup(func() {
+		err := os.RemoveAll(dirPath)
+		require.NoError(t, err, "Could not remove directory")
+
+	})
+
+	for _, c := range []struct {
+		name          string
+		testfile      string
+		perm          os.FileMode
+		expectedError error
+	}{
+		{
+			name:          "Test config file with permission 0700",
+			testfile:      ".config_0700",
+			perm:          0700,
+			expectedError: fmt.Errorf("config file has incorrect permission flags:-rwx------.change the file permission either to 0400 or 0600."),
+		},
+		{
+			name:          "Test config file with permission 0777",
+			testfile:      ".config_0777",
+			perm:          0777,
+			expectedError: fmt.Errorf("config file has incorrect permission flags:-rwxrwxrwx.change the file permission either to 0400 or 0600."),
+		},
+		{
+			name:          "Test config file with permission 0600",
+			testfile:      ".config_0600",
+			perm:          0600,
+			expectedError: nil,
+		},
+		{
+			name:          "Test config file with permission 0400",
+			testfile:      ".config_0400",
+			perm:          0400,
+			expectedError: nil,
+		},
+		{
+			name:          "Test config file with permission 0300",
+			testfile:      ".config_0300",
+			perm:          0300,
+			expectedError: fmt.Errorf("config file has incorrect permission flags:--wx------.change the file permission either to 0400 or 0600."),
+		},
+	} {
+		t.Run(c.name, func(t *testing.T) {
+
+			filePath := filepath.Join(dirPath, c.testfile)
+
+			f, err := os.Create(filePath)
+			require.NoError(t, err, "Could not write  create config file: %v", err)
+			defer f.Close()
+
+			err = f.Chmod(c.perm)
+			require.NoError(t, err, "Could not change the file permission to %s: %v", c.perm, err)
+
+			fi, err := os.Stat(filePath)
+			require.NoError(t, err, "Could not access the fileinfo: %v", err)
+
+			if err := getFilePermission(fi); err != nil {
+				assert.EqualError(t, err, c.expectedError.Error())
+			} else {
+				require.Nil(t, err)
+			}
+		})
+	}
+
+}