mirror of
https://github.com/rocky-linux/peridot.git
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66 lines
2.4 KiB
Go
66 lines
2.4 KiB
Go
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// Copyright 2023 Google LLC
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package cert
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import (
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"crypto/tls"
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"errors"
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"sync"
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)
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// defaultCertData holds all the variables pertaining to
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// the default certificate provider created by [DefaultProvider].
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//
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// A singleton model is used to allow the provider to be reused
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// by the transport layer. As mentioned in [DefaultProvider] (provider nil, nil)
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// may be returned to indicate a default provider could not be found, which
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// will skip extra tls config in the transport layer .
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type defaultCertData struct {
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once sync.Once
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provider Provider
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err error
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}
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var (
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defaultCert defaultCertData
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)
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// Provider is a function that can be passed into crypto/tls.Config.GetClientCertificate.
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type Provider func(*tls.CertificateRequestInfo) (*tls.Certificate, error)
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// errSourceUnavailable is a sentinel error to indicate certificate source is unavailable.
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var errSourceUnavailable = errors.New("certificate source is unavailable")
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// DefaultProvider returns a certificate source using the preferred EnterpriseCertificateProxySource.
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// If EnterpriseCertificateProxySource is not available, fall back to the legacy SecureConnectSource.
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//
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// If neither source is available (due to missing configurations), a nil Source and a nil Error are
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// returned to indicate that a default certificate source is unavailable.
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func DefaultProvider() (Provider, error) {
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defaultCert.once.Do(func() {
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defaultCert.provider, defaultCert.err = NewWorkloadX509CertProvider("")
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if errors.Is(defaultCert.err, errSourceUnavailable) {
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defaultCert.provider, defaultCert.err = NewEnterpriseCertificateProxyProvider("")
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if errors.Is(defaultCert.err, errSourceUnavailable) {
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defaultCert.provider, defaultCert.err = NewSecureConnectProvider("")
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if errors.Is(defaultCert.err, errSourceUnavailable) {
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defaultCert.provider, defaultCert.err = nil, nil
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}
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}
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}
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})
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return defaultCert.provider, defaultCert.err
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}
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