/* Copyright 2019 The Kubernetes 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 authority import ( "crypto/ecdsa" "crypto/elliptic" "crypto/rand" "crypto/x509" "crypto/x509/pkix" "math/big" "net/url" "testing" "time" "github.com/google/go-cmp/cmp" "github.com/google/go-cmp/cmp/cmpopts" capi "k8s.io/api/certificates/v1beta1" "k8s.io/apimachinery/pkg/util/diff" ) func TestCertificateAuthority(t *testing.T) { caKey, err := ecdsa.GenerateKey(elliptic.P224(), rand.Reader) if err != nil { t.Fatal(err) } now := time.Now() tmpl := &x509.Certificate{ SerialNumber: big.NewInt(42), Subject: pkix.Name{ CommonName: "test-ca", }, NotBefore: now.Add(-24 * time.Hour), NotAfter: now.Add(24 * time.Hour), KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature | x509.KeyUsageCertSign, BasicConstraintsValid: true, IsCA: true, } der, err := x509.CreateCertificate(rand.Reader, tmpl, tmpl, caKey.Public(), caKey) if err != nil { t.Fatal(err) } caCert, err := x509.ParseCertificate(der) if err != nil { t.Fatal(err) } uri, err := url.Parse("help://me@what:8080/where/when?why=true") if err != nil { t.Fatal(err) } tests := []struct { name string cr x509.CertificateRequest backdate time.Duration policy SigningPolicy want x509.Certificate wantErr bool }{ { name: "ca info", policy: PermissiveSigningPolicy{TTL: time.Hour}, want: x509.Certificate{ Issuer: caCert.Subject, AuthorityKeyId: caCert.SubjectKeyId, NotBefore: now, NotAfter: now.Add(1 * time.Hour), BasicConstraintsValid: true, }, }, { name: "key usage", policy: PermissiveSigningPolicy{TTL: time.Hour, Usages: []capi.KeyUsage{"signing"}}, want: x509.Certificate{ NotBefore: now, NotAfter: now.Add(1 * time.Hour), BasicConstraintsValid: true, KeyUsage: x509.KeyUsageDigitalSignature, }, }, { name: "ext key usage", policy: PermissiveSigningPolicy{TTL: time.Hour, Usages: []capi.KeyUsage{"client auth"}}, want: x509.Certificate{ NotBefore: now, NotAfter: now.Add(1 * time.Hour), BasicConstraintsValid: true, ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth}, }, }, { name: "backdate", policy: PermissiveSigningPolicy{TTL: time.Hour}, backdate: 5 * time.Minute, want: x509.Certificate{ NotBefore: now.Add(-5 * time.Minute), NotAfter: now.Add(55 * time.Minute), BasicConstraintsValid: true, }, }, { name: "truncate expiration", policy: PermissiveSigningPolicy{TTL: 48 * time.Hour}, want: x509.Certificate{ NotBefore: now, NotAfter: now.Add(24 * time.Hour), BasicConstraintsValid: true, }, }, { name: "uri sans", policy: PermissiveSigningPolicy{TTL: time.Hour}, cr: x509.CertificateRequest{ URIs: []*url.URL{uri}, }, want: x509.Certificate{ URIs: []*url.URL{uri}, NotBefore: now, NotAfter: now.Add(1 * time.Hour), BasicConstraintsValid: true, }, }, } crKey, err := ecdsa.GenerateKey(elliptic.P224(), rand.Reader) if err != nil { t.Fatal(err) } for _, test := range tests { t.Run(test.name, func(t *testing.T) { ca := &CertificateAuthority{ Certificate: caCert, PrivateKey: caKey, Now: func() time.Time { return now }, Backdate: test.backdate, } csr, err := x509.CreateCertificateRequest(rand.Reader, &test.cr, crKey) if err != nil { t.Fatal(err) } certDER, err := ca.Sign(csr, test.policy) if err != nil { t.Fatal(err) } if test.wantErr { if err == nil { t.Fatal("expected error") } return } cert, err := x509.ParseCertificate(certDER) if err != nil { t.Fatal(err) } opts := cmp.Options{ cmpopts.IgnoreFields(x509.Certificate{}, "SignatureAlgorithm", "PublicKeyAlgorithm", "Version", "MaxPathLen", ), diff.IgnoreUnset(), cmp.Transformer("RoundTime", func(x time.Time) time.Time { return x.Truncate(time.Second) }), cmp.Comparer(func(x, y *url.URL) bool { return ((x == nil) && (y == nil)) || x.String() == y.String() }), } if !cmp.Equal(*cert, test.want, opts) { t.Errorf("unexpected diff: %v", cmp.Diff(*cert, test.want, opts)) } }) } }