certificates/authority/tls.go
2018-10-05 21:48:36 +00:00

238 lines
8.4 KiB
Go

package authority
import (
"crypto/tls"
"crypto/x509"
"encoding/pem"
"net/http"
"strings"
"time"
"github.com/pkg/errors"
"github.com/smallstep/ca-component/api"
"github.com/smallstep/cli/crypto/pemutil"
"github.com/smallstep/cli/crypto/tlsutil"
"github.com/smallstep/cli/crypto/x509util"
stepx509 "github.com/smallstep/cli/pkg/x509"
)
// GetMinDuration returns the minimum validity of an end-entity (not root or
// intermediate) certificate.
func (a *Authority) GetMinDuration() time.Duration {
if a.config.AuthorityConfig.MinCertDuration == nil {
return minCertDuration
}
return a.config.AuthorityConfig.MinCertDuration.Duration
}
// GetMaxDuration returns the maximum validity of an end-entity (not root or
// intermediate) certificate.
func (a *Authority) GetMaxDuration() time.Duration {
if a.config.AuthorityConfig.MaxCertDuration == nil {
return maxCertDuration
}
return a.config.AuthorityConfig.MaxCertDuration.Duration
}
// GetTLSOptions returns the tls options configured.
func (a *Authority) GetTLSOptions() *tlsutil.TLSOptions {
return a.config.TLS
}
func withDefaultASN1DN(def *x509util.ASN1DN) x509util.WithOption {
return func(p x509util.Profile) error {
if def == nil {
return errors.New("default ASN1DN template cannot be nil")
}
crt := p.Subject()
if len(crt.Subject.Country) == 0 && def.Country != "" {
crt.Subject.Country = append(crt.Subject.Country, def.Country)
}
if len(crt.Subject.Organization) == 0 && def.Organization != "" {
crt.Subject.Organization = append(crt.Subject.Organization, def.Organization)
}
if len(crt.Subject.OrganizationalUnit) == 0 && def.OrganizationalUnit != "" {
crt.Subject.OrganizationalUnit = append(crt.Subject.OrganizationalUnit, def.OrganizationalUnit)
}
if len(crt.Subject.Locality) == 0 && def.Locality != "" {
crt.Subject.Locality = append(crt.Subject.Locality, def.Locality)
}
if len(crt.Subject.Province) == 0 && def.Province != "" {
crt.Subject.Province = append(crt.Subject.Province, def.Province)
}
if len(crt.Subject.StreetAddress) == 0 && def.StreetAddress != "" {
crt.Subject.StreetAddress = append(crt.Subject.StreetAddress, def.StreetAddress)
}
return nil
}
}
// Sign creates a signed certificate from a certificate signing request.
func (a *Authority) Sign(csr *x509.CertificateRequest, opts api.SignOptions, claims ...api.Claim) (*x509.Certificate, *x509.Certificate, error) {
if err := ValidateClaims(csr, claims); err != nil {
return nil, nil, &apiError{err, http.StatusUnauthorized, context{}}
}
stepCSR, err := stepx509.ParseCertificateRequest(csr.Raw)
if err != nil {
return nil, nil, &apiError{errors.Wrap(err, "error converting x509 csr to stepx509 csr"),
http.StatusInternalServerError, context{}}
}
// DNSNames and IPAddresses are validated but to avoid duplications we will
// clean them as x509util.NewLeafProfileWithCSR will set the right values.
stepCSR.DNSNames = nil
stepCSR.IPAddresses = nil
issIdentity := a.intermediateIdentity
leaf, err := x509util.NewLeafProfileWithCSR(stepCSR, issIdentity.Crt,
issIdentity.Key, x509util.WithHosts(csr.Subject.CommonName),
x509util.WithNotBeforeAfter(opts.NotBefore, opts.NotAfter),
withDefaultASN1DN(a.config.AuthorityConfig.Template))
if err != nil {
return nil, nil, &apiError{err, http.StatusInternalServerError, context{}}
}
crtBytes, err := leaf.CreateCertificate()
if err != nil {
return nil, nil, &apiError{errors.Wrap(err, "error creating new leaf certificate from input csr"),
http.StatusInternalServerError, context{}}
}
serverCert, err := x509.ParseCertificate(crtBytes)
if err != nil {
return nil, nil, &apiError{errors.Wrap(err, "error parsing new server certificate"),
http.StatusInternalServerError, context{}}
}
caCert, err := x509.ParseCertificate(issIdentity.Crt.Raw)
if err != nil {
return nil, nil, &apiError{errors.Wrap(err, "error parsing intermediate certificate"),
http.StatusInternalServerError, context{}}
}
return serverCert, caCert, nil
}
// Renew creates a new Certificate identical to the old certificate, except
// with a validity window that begins 'now'.
func (a *Authority) Renew(ocx *x509.Certificate) (*x509.Certificate, *x509.Certificate, error) {
issIdentity := a.intermediateIdentity
// Convert a realx509.Certificate to the step x509 Certificate.
oldCert, err := stepx509.ParseCertificate(ocx.Raw)
if err != nil {
return nil, nil, &apiError{
errors.Wrap(err, "error converting x509.Certificate to stepx509.Certificate"),
http.StatusInternalServerError, context{},
}
}
now := time.Now().UTC()
duration := oldCert.NotAfter.Sub(oldCert.NotBefore)
newCert := &stepx509.Certificate{
PublicKey: oldCert.PublicKey,
Issuer: issIdentity.Crt.Subject,
Subject: oldCert.Subject,
NotBefore: now,
NotAfter: now.Add(duration),
KeyUsage: oldCert.KeyUsage,
Extensions: oldCert.Extensions,
ExtraExtensions: oldCert.ExtraExtensions,
UnhandledCriticalExtensions: oldCert.UnhandledCriticalExtensions,
ExtKeyUsage: oldCert.ExtKeyUsage,
UnknownExtKeyUsage: oldCert.UnknownExtKeyUsage,
BasicConstraintsValid: oldCert.BasicConstraintsValid,
IsCA: oldCert.IsCA,
MaxPathLen: oldCert.MaxPathLen,
MaxPathLenZero: oldCert.MaxPathLenZero,
OCSPServer: oldCert.OCSPServer,
IssuingCertificateURL: oldCert.IssuingCertificateURL,
DNSNames: oldCert.DNSNames,
EmailAddresses: oldCert.EmailAddresses,
IPAddresses: oldCert.IPAddresses,
URIs: oldCert.URIs,
PermittedDNSDomainsCritical: oldCert.PermittedDNSDomainsCritical,
PermittedDNSDomains: oldCert.PermittedDNSDomains,
ExcludedDNSDomains: oldCert.ExcludedDNSDomains,
PermittedIPRanges: oldCert.PermittedIPRanges,
ExcludedIPRanges: oldCert.ExcludedIPRanges,
PermittedEmailAddresses: oldCert.PermittedEmailAddresses,
ExcludedEmailAddresses: oldCert.ExcludedEmailAddresses,
PermittedURIDomains: oldCert.PermittedURIDomains,
ExcludedURIDomains: oldCert.ExcludedURIDomains,
CRLDistributionPoints: oldCert.CRLDistributionPoints,
PolicyIdentifiers: oldCert.PolicyIdentifiers,
}
leaf, err := x509util.NewLeafProfileWithTemplate(newCert,
issIdentity.Crt, issIdentity.Key)
if err != nil {
return nil, nil, &apiError{err, http.StatusInternalServerError, context{}}
}
crtBytes, err := leaf.CreateCertificate()
if err != nil {
return nil, nil, &apiError{errors.Wrap(err, "error renewing certificate from existing server certificate"),
http.StatusInternalServerError, context{}}
}
serverCert, err := x509.ParseCertificate(crtBytes)
if err != nil {
return nil, nil, &apiError{errors.Wrap(err, "error parsing new server certificate"),
http.StatusInternalServerError, context{}}
}
caCert, err := x509.ParseCertificate(issIdentity.Crt.Raw)
if err != nil {
return nil, nil, &apiError{errors.Wrap(err, "error parsing intermediate certificate"),
http.StatusInternalServerError, context{}}
}
return serverCert, caCert, nil
}
// GetTLSCertificate creates a new leaf certificate to be used by the CA HTTPS server.
func (a *Authority) GetTLSCertificate() (*tls.Certificate, error) {
profile, err := x509util.NewLeafProfile("Step Online CA",
a.intermediateIdentity.Crt, a.intermediateIdentity.Key,
x509util.WithHosts(strings.Join(a.config.DNSNames, ",")))
if err != nil {
return nil, err
}
crtBytes, err := profile.CreateCertificate()
if err != nil {
return nil, err
}
keyPEM, err := pemutil.Serialize(profile.SubjectPrivateKey())
if err != nil {
return nil, err
}
crtPEM := pem.EncodeToMemory(&pem.Block{
Type: "CERTIFICATE",
Bytes: crtBytes,
})
// Load the x509 key pair (combining server and intermediate blocks)
// to a tls.Certificate.
intermediatePEM, err := pemutil.Serialize(a.intermediateIdentity.Crt)
if err != nil {
return nil, err
}
tlsCrt, err := tls.X509KeyPair(append(crtPEM,
pem.EncodeToMemory(intermediatePEM)...),
pem.EncodeToMemory(keyPEM))
if err != nil {
return nil, errors.Wrap(err, "error creating tls certificate")
}
// Get the 'leaf' certificate and set the attribute accordingly.
leaf, err := x509.ParseCertificate(tlsCrt.Certificate[0])
if err != nil {
return nil, errors.Wrap(err, "error parsing tls certificate")
}
tlsCrt.Leaf = leaf
return &tlsCrt, nil
}