mirror of https://github.com/grpc/grpc-go.git
52 lines
1.6 KiB
Go
52 lines
1.6 KiB
Go
/*
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*
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* Copyright 2020 gRPC authors.
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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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*
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*/
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package advancedtls
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import (
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"crypto/tls"
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"fmt"
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)
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// buildGetCertificates returns the certificate that matches the SNI field
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// for the given ClientHelloInfo, defaulting to the first element of o.GetCertificates.
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func buildGetCertificates(clientHello *tls.ClientHelloInfo, o *ServerOptions) (*tls.Certificate, error) {
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if o.IdentityOptions.GetIdentityCertificatesForServer == nil {
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return nil, fmt.Errorf("function GetCertificates must be specified")
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}
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certificates, err := o.IdentityOptions.GetIdentityCertificatesForServer(clientHello)
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if err != nil {
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return nil, err
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}
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if len(certificates) == 0 {
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return nil, fmt.Errorf("no certificates configured")
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}
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// If users pass in only one certificate, return that certificate.
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if len(certificates) == 1 {
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return certificates[0], nil
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}
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// Choose the SNI certificate using SupportsCertificate.
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for _, cert := range certificates {
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if err := clientHello.SupportsCertificate(cert); err == nil {
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return cert, nil
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}
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}
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// If nothing matches, return the first certificate.
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return certificates[0], nil
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}
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