Fix #8168 - AWS secrets should not be exposed while running tests

Changed the tests to use mocked function that will not read actual
secrets from env variables nor AWS config file that may be
on the system that is running tests.

As a second guard against exposed secrets comparison for the values
does not shows the actual values for the AWS data. This is to prevent
situation where programming error may still allow the test to read
AWS config/env variables instead of using mocked function.

Signed-off-by: Michal Pryc <mpryc@redhat.com>

pkg/repository/config/aws.go

@@ -34,6 +34,9 @@ import (
 	"github.com/pkg/errors"
 )
 
+// getS3CredentialsFunc is used to make testing more convenient
+var getS3CredentialsFunc = GetS3Credentials
+
 const (
 	// AWS specific environment variable
 	awsProfileEnvVar         = "AWS_PROFILE"
@@ -63,7 +66,7 @@ func GetS3ResticEnvVars(config map[string]string) (map[string]string, error) {
 	// GetS3ResticEnvVars reads the AWS config, from files and envs
 	// if needed assumes the role and returns the session credentials
 	// setting these variables emulates what would happen for example when using kube2iam
-	if creds, err := GetS3Credentials(config); err == nil && creds != nil {
+	if creds, err := getS3CredentialsFunc(config); err == nil && creds != nil {
 		result[awsKeyIDEnvVar] = creds.AccessKeyID
 		result[awsSecretKeyEnvVar] = creds.SecretAccessKey
 		result[awsSessTokenEnvVar] = creds.SessionToken

pkg/repository/config/aws_test.go

@@ -27,14 +27,18 @@ import (
 
 func TestGetS3ResticEnvVars(t *testing.T) {
 	testCases := []struct {
-		name     string
-		config   map[string]string
-		expected map[string]string
+		name             string
+		config           map[string]string
+		expected         map[string]string
+		getS3Credentials func(config map[string]string) (*aws.Credentials, error)
 	}{
 		{
 			name:     "when config is empty, no env vars are returned",
 			config:   map[string]string{},
 			expected: map[string]string{},
+			getS3Credentials: func(config map[string]string) (*aws.Credentials, error) {
+				return nil, nil
+			},
 		},
 		{
 			name: "when config contains profile key, profile env var is set with profile value",
@@ -53,16 +57,39 @@ func TestGetS3ResticEnvVars(t *testing.T) {
 			expected: map[string]string{
 				"AWS_SHARED_CREDENTIALS_FILE": "/tmp/credentials/path/to/secret",
 			},
+			getS3Credentials: func(config map[string]string) (*aws.Credentials, error) {
+				return nil, nil
+			},
 		},
 	}
 
 	for _, tc := range testCases {
 		t.Run(tc.name, func(t *testing.T) {
+			// Mock GetS3Credentials
+			if tc.getS3Credentials != nil {
+				getS3CredentialsFunc = tc.getS3Credentials
+			} else {
+				getS3CredentialsFunc = GetS3Credentials
+			}
+
 			actual, err := GetS3ResticEnvVars(tc.config)
 
 			require.NoError(t, err)
 
-			require.Equal(t, tc.expected, actual)
+			// Avoid direct comparison of expected and actual to prevent exposing secrets.
+			// This may occur if the test doesn't set getS3Credentials func correctly.
+			if !reflect.DeepEqual(tc.expected, actual) {
+				t.Errorf("Expected and actual results do not match for test case %q", tc.name)
+				for key, value := range actual {
+					if expVal, err := tc.expected[key]; !err || expVal != value {
+						if actualVal, ok := actual[key]; !ok {
+							t.Errorf("Key %q is missing in actual result", key)
+						} else if expVal != actualVal {
+							t.Errorf("Key %q: expected value %q", key, expVal)
+						}
+					}
+				}
+			}
 		})
 	}
 }
@@ -117,6 +144,11 @@ func TestGetS3CredentialsCorrectlyUseProfile(t *testing.T) {
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
+			// Ensure env variables do not set AWS config entries
+			t.Setenv("AWS_ACCESS_KEY_ID", "")
+			t.Setenv("AWS_SECRET_ACCESS_KEY", "")
+			t.Setenv("AWS_SHARED_CREDENTIALS_FILE", "")
+
 			tmpFile, err := os.CreateTemp("", "velero-test-aws-credentials")
 			defer os.Remove(tmpFile.Name())
 			if err != nil {
@@ -129,6 +161,7 @@ func TestGetS3CredentialsCorrectlyUseProfile(t *testing.T) {
 				t.Errorf("GetS3Credentials() error = %v", err)
 				return
 			}
+
 			tt.args.config["credentialsFile"] = tmpFile.Name()
 			got, err := GetS3Credentials(tt.args.config)
 			if (err != nil) != tt.wantErr {
@@ -136,10 +169,10 @@ func TestGetS3CredentialsCorrectlyUseProfile(t *testing.T) {
 				return
 			}
 			if !reflect.DeepEqual(got.AccessKeyID, tt.want.AccessKeyID) {
-				t.Errorf("GetS3Credentials() got = %v, want %v", got.AccessKeyID, tt.want.AccessKeyID)
+				t.Errorf("GetS3Credentials() want %v", tt.want.AccessKeyID)
 			}
 			if !reflect.DeepEqual(got.SecretAccessKey, tt.want.SecretAccessKey) {
-				t.Errorf("GetS3Credentials() got = %v, want %v", got.SecretAccessKey, tt.want.SecretAccessKey)
+				t.Errorf("GetS3Credentials() want %v", tt.want.SecretAccessKey)
 			}
 		})
 	}