|
| 1 | +/* |
| 2 | +Copyright 2024 The Kubernetes Authors. |
| 3 | +
|
| 4 | +Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | +you may not use this file except in compliance with the License. |
| 6 | +You may obtain a copy of the License at |
| 7 | +
|
| 8 | + http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | +
|
| 10 | +Unless required by applicable law or agreed to in writing, software |
| 11 | +distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | +WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | +See the License for the specific language governing permissions and |
| 14 | +limitations under the License. |
| 15 | +*/ |
| 16 | + |
| 17 | +package kubernetes |
| 18 | + |
| 19 | +import ( |
| 20 | + "bytes" |
| 21 | + "crypto/x509" |
| 22 | + "encoding/pem" |
| 23 | + "testing" |
| 24 | + |
| 25 | + "github.com/stretchr/testify/require" |
| 26 | +) |
| 27 | + |
| 28 | +func Test_generateRSACert(t *testing.T) { |
| 29 | + tests := []struct { |
| 30 | + name string |
| 31 | + hosts []string |
| 32 | + expectedErr string |
| 33 | + }{ |
| 34 | + { |
| 35 | + name: "one host generates cert with no host", |
| 36 | + hosts: []string{}, |
| 37 | + }, |
| 38 | + { |
| 39 | + name: "one host generates cert for same host", |
| 40 | + hosts: []string{"abc.example.com"}, |
| 41 | + }, |
| 42 | + { |
| 43 | + name: "wildcard generates cert for same host", |
| 44 | + hosts: []string{"*.example.com"}, |
| 45 | + }, |
| 46 | + { |
| 47 | + name: "two hosts generates cert for both hosts", |
| 48 | + hosts: []string{"abc.example.com", "def.example.com"}, |
| 49 | + }, |
| 50 | + { |
| 51 | + name: "bad host generates cert for no host", |
| 52 | + hosts: []string{"--abc.example.com"}, |
| 53 | + expectedErr: "x509: certificate is not valid for any names, but wanted to match --abc.example.com", |
| 54 | + }, |
| 55 | + { |
| 56 | + name: "one good host and one bad host generates cert for only good host", |
| 57 | + hosts: []string{"---.example.com", "def.example.com"}, |
| 58 | + expectedErr: "x509: certificate is valid for def.example.com, not ---.example.com", |
| 59 | + }, |
| 60 | + } |
| 61 | + |
| 62 | + var serverKey, serverCert bytes.Buffer |
| 63 | + |
| 64 | + for _, tc := range tests { |
| 65 | + t.Run(tc.name, func(t *testing.T) { |
| 66 | + serverCert.Reset() |
| 67 | + serverKey.Reset() |
| 68 | + // Test the function generateCACert. We can only test normative function |
| 69 | + // and hostnames, everything else is hardcoded. |
| 70 | + err := generateCACert(tc.hosts, &serverKey, &serverCert) |
| 71 | + require.NoError(t, err, "unexpected error generating RSA certificate") |
| 72 | + |
| 73 | + // Test that the CA certificate is decodable, parseable, and has the configured hostname/s. |
| 74 | + block, _ := pem.Decode(serverCert.Bytes()) |
| 75 | + if block == nil { |
| 76 | + require.FailNow(t, "failed to decode PEM block containing cert") |
| 77 | + } |
| 78 | + if block.Type == "CERTIFICATE" { |
| 79 | + cert, err := x509.ParseCertificate(block.Bytes) |
| 80 | + require.NoError(t, err, "failed to parse certificate") |
| 81 | + for _, h := range tc.hosts { |
| 82 | + if err = cert.VerifyHostname(h); err != nil { |
| 83 | + require.EqualValues(t, tc.expectedErr, err.Error(), "certificate verification failed") |
| 84 | + } else if len(tc.hosts) < 2 && err == nil && tc.expectedErr != "" { |
| 85 | + require.EqualValues(t, tc.expectedErr, nil, "expected an error but certification verification succeeded") |
| 86 | + } |
| 87 | + } |
| 88 | + } |
| 89 | + // Test that the server key is decodable and parseable. |
| 90 | + block, _ = pem.Decode(serverKey.Bytes()) |
| 91 | + if block == nil { |
| 92 | + require.FailNow(t, "failed to decode PEM block containing public key") |
| 93 | + } |
| 94 | + if block.Type == "RSA PRIVATE KEY" { |
| 95 | + _, err := x509.ParsePKCS1PrivateKey(block.Bytes) |
| 96 | + require.NoError(t, err, "failed to parse key") |
| 97 | + } |
| 98 | + }) |
| 99 | + } |
| 100 | +} |
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