Fix the valid client certificate check

The commit edef33d introduced
additional checks on the certificate subject. The issue is that the
order of the groups and organizational units are not consistent, so it
was causing the addon-framework to generate several CSRs with many
coming back as invalid.

This takes the approach of sorting the strings before doing the
comparison.

Signed-off-by: mprahl <mprahl@users.noreply.github.com>

pkg/registration/clientcert/certificate.go

@@ -7,6 +7,7 @@ import (
 	"errors"
 	"fmt"
 	"reflect"
+	"sort"
 	"time"
 
 	"github.com/openshift/library-go/pkg/operator/events"
@@ -112,17 +113,24 @@ func certMatchSubject(cert *x509.Certificate, subject *pkix.Name) bool {
 		return false
 	}
 
-	// check groups(origanization)
-	if !reflect.DeepEqual(cert.Subject.Organization, subject.Organization) {
+	// check groups (organization)
+	if !unorderedEqualStrings(cert.Subject.Organization, subject.Organization) {
 		return false
 	}
 
-	// check originzation unit
-	if !reflect.DeepEqual(cert.Subject.OrganizationalUnit, subject.OrganizationalUnit) {
-		return false
-	}
+	// check organizational units
+	return unorderedEqualStrings(cert.Subject.OrganizationalUnit, subject.OrganizationalUnit)
+}
+
+// unorderedEqualStrings compares to string slices without considering the order.
+func unorderedEqualStrings(a []string, b []string) bool {
+	sortedA := append([]string{}, a...)
+	sort.Strings(sortedA)
+
+	sortedB := append([]string{}, b...)
+	sort.Strings(sortedB)
 
-	return true
+	return reflect.DeepEqual(sortedA, sortedB)
 }
 
 // getCertValidityPeriod returns the validity period of the client certificate in the secret

pkg/registration/clientcert/certificate_test.go

@@ -201,6 +201,20 @@ func TestIsCertificateValid(t *testing.T) {
 			},
 			isValid: true,
 		},
+		{
+			name: "valid cert different order",
+			testCert: testinghelpers.NewTestCertWithSubject(pkix.Name{
+				CommonName:         "test",
+				Organization:       []string{"org", "org2"},
+				OrganizationalUnit: []string{"ou", "ou2"},
+			}, 60*time.Second),
+			subject: &pkix.Name{
+				CommonName:         "test",
+				Organization:       []string{"org2", "org"},
+				OrganizationalUnit: []string{"ou2", "ou"},
+			},
+			isValid: true,
+		},
 	}
 	for _, c := range cases {
 		t.Run(c.name, func(t *testing.T) {