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tls.go
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tls.go
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// Copyright 2018 GRAIL, Inc. All rights reserved.
// Use of this source code is governed by the Apache-2.0
// license that can be found in the LICENSE file.
package ticket
import (
"bytes"
"crypto/x509"
"encoding/pem"
"time"
"github.com/grailbio/base/common/log"
"github.com/grailbio/base/security/keycrypt"
"github.com/grailbio/base/security/tls/certificateauthority"
)
const tlsDriftMargin = 10 * time.Minute
func (b *TlsCertAuthorityBuilder) newTlsClientTicket(ctx *TicketContext) (TicketTlsClientTicket, error) {
tlsCredentials, err := b.genTlsCredentials(ctx)
if err != nil {
return TicketTlsClientTicket{}, err
}
return TicketTlsClientTicket{
Value: TlsClientTicket{
Credentials: tlsCredentials,
},
}, nil
}
func (b *TlsCertAuthorityBuilder) newTlsServerTicket(ctx *TicketContext) (TicketTlsServerTicket, error) {
tlsCredentials, err := b.genTlsCredentials(ctx)
if err != nil {
return TicketTlsServerTicket{}, err
}
return TicketTlsServerTicket{
Value: TlsServerTicket{
Credentials: tlsCredentials,
},
}, nil
}
func (b *TlsCertAuthorityBuilder) newDockerTicket(ctx *TicketContext) (TicketDockerTicket, error) {
tlsCredentials, err := b.genTlsCredentials(ctx)
if err != nil {
return TicketDockerTicket{}, err
}
return TicketDockerTicket{
Value: DockerTicket{
Credentials: tlsCredentials,
},
}, nil
}
func (b *TlsCertAuthorityBuilder) newDockerServerTicket(ctx *TicketContext) (TicketDockerServerTicket, error) {
tlsCredentials, err := b.genTlsCredentialsWithKeyUsage(ctx, []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth})
if err != nil {
return TicketDockerServerTicket{}, err
}
return TicketDockerServerTicket{
Value: DockerServerTicket{
Credentials: tlsCredentials,
},
}, nil
}
func (b *TlsCertAuthorityBuilder) newDockerClientTicket(ctx *TicketContext) (TicketDockerClientTicket, error) {
tlsCredentials, err := b.genTlsCredentialsWithKeyUsage(ctx, []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth})
if err != nil {
return TicketDockerClientTicket{}, err
}
return TicketDockerClientTicket{
Value: DockerClientTicket{
Credentials: tlsCredentials,
},
}, nil
}
func (b *TlsCertAuthorityBuilder) genTlsCredentials(ctx *TicketContext) (TlsCredentials, error) {
log.Info(ctx.ctx, "Generating TLS credentials.", "TlsCertAuthorityBuilder", b)
return b.genTlsCredentialsWithKeyUsage(ctx, []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth, x509.ExtKeyUsageClientAuth})
}
func contains(array []string, entry string) bool {
for _, e := range array {
if e == entry {
return true
}
}
return false
}
func (b *TlsCertAuthorityBuilder) genTlsCredentialsWithKeyUsage(ctx *TicketContext, keyUsage []x509.ExtKeyUsage) (TlsCredentials, error) {
empty := TlsCredentials{}
secret, err := keycrypt.Lookup(b.Authority)
if err != nil {
return empty, err
}
authority := certificateauthority.CertificateAuthority{DriftMargin: tlsDriftMargin, Signer: secret}
if err := authority.Init(); err != nil {
return empty, err
}
ttl := time.Duration(b.TtlSec) * time.Second
commonName := b.CommonName
if commonName == "" {
commonName = ctx.remoteBlessings.String()
}
updatedSan := b.San
if !contains(updatedSan, commonName) {
updatedSan = append(updatedSan, commonName)
}
cert, key, err := authority.IssueWithKeyUsage(commonName, ttl, nil, updatedSan, keyUsage)
if err != nil {
return empty, err
}
r := TlsCredentials{}
r.AuthorityCert, err = encode(&pem.Block{Type: "CERTIFICATE", Bytes: authority.Cert.Raw})
if err != nil {
return empty, err
}
r.Cert, err = encode(&pem.Block{Type: "CERTIFICATE", Bytes: cert})
if err != nil {
return empty, err
}
r.Key, err = encode(&pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(key)})
if err != nil {
return empty, err
}
return r, nil
}
func encode(block *pem.Block) (string, error) {
var w bytes.Buffer
if err := pem.Encode(&w, block); err != nil {
return "", err
}
return w.String(), nil
}