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[Heartbeat] Handle TLS certs missing notBefore/notAfter (elastic#9566)
* [Heartbeat] Handle TLS certs missing notBefore/notAfter Some certs in the wild don't set these standard fields and can cause an NPE Fixes elastic#9556 * Add changelog entry
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| Original file line number | Diff line number | Diff line change |
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| // Licensed to Elasticsearch B.V. under one or more contributor | ||
| // license agreements. See the NOTICE file distributed with | ||
| // this work for additional information regarding copyright | ||
| // ownership. Elasticsearch B.V. licenses this file to you 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. | ||
|
|
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| package dialchain | ||
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|
||
| import ( | ||
| "crypto/x509" | ||
| "crypto/x509/pkix" | ||
| "math/big" | ||
| "testing" | ||
| "time" | ||
|
|
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| "github.com/stretchr/testify/assert" | ||
|
|
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| "github.com/elastic/beats/libbeat/common" | ||
| ) | ||
|
|
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| func Test_addCertMetdata(t *testing.T) { | ||
| goodNotBefore := time.Now().Add(-time.Hour) | ||
| goodNotAfter := time.Now().Add(time.Hour) | ||
| goodCert := x509.Certificate{ | ||
| SerialNumber: big.NewInt(1), | ||
| Subject: pkix.Name{ | ||
| Organization: []string{"Acme Co"}, | ||
| }, | ||
| NotBefore: goodNotBefore, | ||
| NotAfter: goodNotAfter, | ||
| KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature, | ||
| ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth}, | ||
| BasicConstraintsValid: true, | ||
| } | ||
|
|
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| missingNotBeforeCert := x509.Certificate{ | ||
| SerialNumber: big.NewInt(1), | ||
| Subject: pkix.Name{ | ||
| Organization: []string{"Acme Co"}, | ||
| }, | ||
| NotAfter: goodNotAfter, | ||
| KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature, | ||
| ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth}, | ||
| BasicConstraintsValid: true, | ||
| } | ||
|
|
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| missingNotAfterCert := x509.Certificate{ | ||
| SerialNumber: big.NewInt(1), | ||
| Subject: pkix.Name{ | ||
| Organization: []string{"Acme Co"}, | ||
| }, | ||
| NotBefore: goodNotBefore, | ||
| KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature, | ||
| ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth}, | ||
| BasicConstraintsValid: true, | ||
| } | ||
|
|
||
| // notBefore is intentionally not a pointer type because go certificates don't have nullable time types | ||
| // we cheat a bit and make not after nullable because there's no valid reason to create a cert with go's zero | ||
| // time. | ||
| // see the addCertMetadata function for more info on this. | ||
| type expected struct { | ||
| notBefore time.Time | ||
| notAfter *time.Time | ||
| } | ||
| tests := []struct { | ||
| name string | ||
| chains [][]*x509.Certificate | ||
| expected expected | ||
| }{ | ||
| { | ||
| "Valid cert", | ||
| [][]*x509.Certificate{{&goodCert}}, | ||
| expected{ | ||
| notBefore: goodNotBefore, | ||
| notAfter: &goodNotAfter, | ||
| }, | ||
| }, | ||
| { | ||
| "Missing not before", | ||
| [][]*x509.Certificate{{&missingNotBeforeCert}}, | ||
| expected{ | ||
| notAfter: &goodNotAfter, | ||
| }, | ||
| }, | ||
| { | ||
| "Missing not after", | ||
| [][]*x509.Certificate{{&missingNotAfterCert}}, | ||
| expected{ | ||
| notBefore: goodNotBefore, | ||
| }, | ||
| }, | ||
| } | ||
| for _, tt := range tests { | ||
| t.Run(tt.name, func(t *testing.T) { | ||
| event := common.MapStr{} | ||
| addCertMetdata(event, tt.chains) | ||
| v, err := event.GetValue("tls.certificate_not_valid_before") | ||
| assert.NoError(t, err) | ||
| assert.Equal(t, tt.expected.notBefore, v) | ||
|
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||
| if tt.expected.notAfter != nil { | ||
| v, err := event.GetValue("tls.certificate_not_valid_after") | ||
| assert.NoError(t, err) | ||
| assert.Equal(t, *tt.expected.notAfter, v) | ||
| } else { | ||
| ok, _ := event.HasKey("tls.certificate_not_valid_after") | ||
| assert.False(t, ok, "event should not have not after %v", event) | ||
| } | ||
| }) | ||
| } | ||
| } |