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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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// 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, | ||
} | ||
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// 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) | ||
} | ||
}) | ||
} | ||
} |