certificates/authority/authority.go

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package authority
import (
"crypto/sha256"
"crypto/x509"
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"encoding/hex"
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"fmt"
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"sync"
"time"
"github.com/smallstep/certificates/authority/provisioner"
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"github.com/smallstep/cli/crypto/pemutil"
"github.com/smallstep/cli/crypto/x509util"
)
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const legacyAuthority = "step-certificate-authority"
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// Authority implements the Certificate Authority internal interface.
type Authority struct {
config *Config
rootX509Certs []*x509.Certificate
intermediateIdentity *x509util.Identity
validateOnce bool
certificates *sync.Map
ottMap *sync.Map
startTime time.Time
provisioners *provisioner.Collection
audiences []string
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// Do not re-initialize
initOnce bool
}
// New creates and initiates a new Authority type.
func New(config *Config) (*Authority, error) {
err := config.Validate()
if err != nil {
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return nil, err
}
// Define audiences: legacy + possible urls without the ports.
// The CA might have proxies in front so we cannot rely on the port.
audiences := []string{legacyAuthority}
for _, name := range config.DNSNames {
audiences = append(audiences, fmt.Sprintf("https://%s/sign", name), fmt.Sprintf("https://%s/1.0/sign", name))
}
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var a = &Authority{
config: config,
certificates: new(sync.Map),
ottMap: new(sync.Map),
provisioners: provisioner.NewCollection(audiences),
audiences: audiences,
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}
if err := a.init(); err != nil {
return nil, err
}
return a, nil
}
// init performs validation and initializes the fields of an Authority struct.
func (a *Authority) init() error {
// Check if handler has already been validated/initialized.
if a.initOnce {
return nil
}
var err error
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// Load the root certificates and add them to the certificate store
a.rootX509Certs = make([]*x509.Certificate, len(a.config.Root))
for i, path := range a.config.Root {
crt, err := pemutil.ReadCertificate(path)
if err != nil {
return err
}
// Add root certificate to the certificate map
sum := sha256.Sum256(crt.Raw)
a.certificates.Store(hex.EncodeToString(sum[:]), crt)
a.rootX509Certs[i] = crt
}
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// Add federated roots
for _, path := range a.config.FederatedRoots {
crt, err := pemutil.ReadCertificate(path)
if err != nil {
return err
}
sum := sha256.Sum256(crt.Raw)
a.certificates.Store(hex.EncodeToString(sum[:]), crt)
}
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// Decrypt and load intermediate public / private key pair.
if len(a.config.Password) > 0 {
a.intermediateIdentity, err = x509util.LoadIdentityFromDisk(
a.config.IntermediateCert,
a.config.IntermediateKey,
pemutil.WithPassword([]byte(a.config.Password)),
)
if err != nil {
return err
}
} else {
a.intermediateIdentity, err = x509util.LoadIdentityFromDisk(a.config.IntermediateCert, a.config.IntermediateKey)
if err != nil {
return err
}
}
// Store all the provisioners
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for _, p := range a.config.AuthorityConfig.Provisioners {
if err := a.provisioners.Store(p); err != nil {
return err
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}
}
a.startTime = time.Now()
// Set flag indicating that initialization has been completed, and should
// not be repeated.
a.initOnce = true
return nil
}