69 lines
2.1 KiB
Go
69 lines
2.1 KiB
Go
/*
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Copyright 2020 The cert-manager Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package pki
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import cmapi "github.com/cert-manager/cert-manager/pkg/apis/certmanager/v1"
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// staticTemporarySerialNumber is a fixed serial number we use for temporary certificates
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const staticTemporarySerialNumber = "1234567890"
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// GenerateLocallySignedTemporaryCertificate signs a temporary certificate for
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// the given certificate resource using a one-use temporary CA that is then
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// discarded afterwards.
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// This is to mitigate a potential attack against x509 certificates that use a
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// predictable serial number and weak MD5 hashing algorithms.
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// In practice, this shouldn't really be a concern anyway.
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func GenerateLocallySignedTemporaryCertificate(crt *cmapi.Certificate, pkData []byte) ([]byte, error) {
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// generate a throwaway self-signed root CA
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caPk, err := GenerateECPrivateKey(ECCurve521)
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if err != nil {
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return nil, err
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}
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caCertTemplate, err := CertificateTemplateFromCertificate(&cmapi.Certificate{
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Spec: cmapi.CertificateSpec{
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CommonName: "cert-manager.local",
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IsCA: true,
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},
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})
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if err != nil {
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return nil, err
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}
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_, caCert, err := SignCertificate(caCertTemplate, caCertTemplate, caPk.Public(), caPk)
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if err != nil {
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return nil, err
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}
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// sign a temporary certificate using the root CA
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template, err := CertificateTemplateFromCertificate(crt)
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if err != nil {
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return nil, err
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}
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template.Subject.SerialNumber = staticTemporarySerialNumber
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signeeKey, err := DecodePrivateKeyBytes(pkData)
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if err != nil {
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return nil, err
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}
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b, _, err := SignCertificate(template, caCert, signeeKey.Public(), caPk)
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if err != nil {
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return nil, err
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}
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return b, nil
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}
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