forked from TrueCloudLab/certificates
299 lines
9.7 KiB
Go
299 lines
9.7 KiB
Go
package authority
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import (
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"crypto/tls"
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"crypto/x509"
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"crypto/x509/pkix"
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"encoding/asn1"
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"encoding/pem"
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"net/http"
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"strings"
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"time"
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"github.com/pkg/errors"
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"github.com/smallstep/cli/crypto/pemutil"
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"github.com/smallstep/cli/crypto/tlsutil"
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"github.com/smallstep/cli/crypto/x509util"
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stepx509 "github.com/smallstep/cli/pkg/x509"
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)
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// GetTLSOptions returns the tls options configured.
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func (a *Authority) GetTLSOptions() *tlsutil.TLSOptions {
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return a.config.TLS
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}
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// SignOptions contains the options that can be passed to the Authority.Sign
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// method.
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type SignOptions struct {
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NotAfter time.Time `json:"notAfter"`
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NotBefore time.Time `json:"notBefore"`
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}
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var (
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stepOIDRoot = asn1.ObjectIdentifier{1, 3, 6, 1, 4, 1, 37476, 9000, 64}
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stepOIDProvisioner = append(asn1.ObjectIdentifier(nil), append(stepOIDRoot, 1)...)
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oidAuthorityKeyIdentifier = asn1.ObjectIdentifier{2, 5, 29, 35}
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)
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type stepProvisionerASN1 struct {
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Type int
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Name []byte
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CredentialID []byte
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}
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const provisionerTypeJWK = 1
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func withProvisionerOID(name, kid string) x509util.WithOption {
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return func(p x509util.Profile) error {
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crt := p.Subject()
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b, err := asn1.Marshal(stepProvisionerASN1{
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Type: provisionerTypeJWK,
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Name: []byte(name),
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CredentialID: []byte(kid),
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})
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if err != nil {
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return err
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}
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crt.ExtraExtensions = append(crt.ExtraExtensions, pkix.Extension{
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Id: stepOIDProvisioner,
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Critical: false,
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Value: b,
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})
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return nil
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}
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}
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func withDefaultASN1DN(def *x509util.ASN1DN) x509util.WithOption {
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return func(p x509util.Profile) error {
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if def == nil {
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return errors.New("default ASN1DN template cannot be nil")
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}
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crt := p.Subject()
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if len(crt.Subject.Country) == 0 && def.Country != "" {
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crt.Subject.Country = append(crt.Subject.Country, def.Country)
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}
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if len(crt.Subject.Organization) == 0 && def.Organization != "" {
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crt.Subject.Organization = append(crt.Subject.Organization, def.Organization)
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}
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if len(crt.Subject.OrganizationalUnit) == 0 && def.OrganizationalUnit != "" {
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crt.Subject.OrganizationalUnit = append(crt.Subject.OrganizationalUnit, def.OrganizationalUnit)
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}
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if len(crt.Subject.Locality) == 0 && def.Locality != "" {
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crt.Subject.Locality = append(crt.Subject.Locality, def.Locality)
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}
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if len(crt.Subject.Province) == 0 && def.Province != "" {
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crt.Subject.Province = append(crt.Subject.Province, def.Province)
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}
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if len(crt.Subject.StreetAddress) == 0 && def.StreetAddress != "" {
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crt.Subject.StreetAddress = append(crt.Subject.StreetAddress, def.StreetAddress)
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}
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return nil
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}
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}
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// Sign creates a signed certificate from a certificate signing request.
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func (a *Authority) Sign(csr *x509.CertificateRequest, signOpts SignOptions, extraOpts ...interface{}) (*x509.Certificate, *x509.Certificate, error) {
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var (
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errContext = context{"csr": csr, "signOptions": signOpts}
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claims = []certClaim{}
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mods = []x509util.WithOption{}
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)
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for _, op := range extraOpts {
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switch k := op.(type) {
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case certClaim:
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claims = append(claims, k)
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case x509util.WithOption:
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mods = append(mods, k)
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case *Provisioner:
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m, c, err := k.getTLSApps(signOpts)
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if err != nil {
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return nil, nil, &apiError{err, http.StatusInternalServerError, errContext}
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}
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mods = append(mods, m...)
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mods = append(mods, []x509util.WithOption{
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withDefaultASN1DN(a.config.AuthorityConfig.Template),
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}...)
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claims = append(claims, c...)
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default:
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return nil, nil, &apiError{errors.Errorf("sign: invalid extra option type %T", k),
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http.StatusInternalServerError, errContext}
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}
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}
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stepCSR, err := stepx509.ParseCertificateRequest(csr.Raw)
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if err != nil {
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return nil, nil, &apiError{errors.Wrap(err, "sign: error converting x509 csr to stepx509 csr"),
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http.StatusInternalServerError, errContext}
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}
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issIdentity := a.intermediateIdentity
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leaf, err := x509util.NewLeafProfileWithCSR(stepCSR, issIdentity.Crt,
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issIdentity.Key, mods...)
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if err != nil {
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return nil, nil, &apiError{errors.Wrapf(err, "sign"), http.StatusInternalServerError, errContext}
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}
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if err := validateClaims(leaf.Subject(), claims); err != nil {
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return nil, nil, &apiError{errors.Wrapf(err, "sign"), http.StatusUnauthorized, errContext}
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}
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crtBytes, err := leaf.CreateCertificate()
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if err != nil {
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return nil, nil, &apiError{errors.Wrap(err, "sign: error creating new leaf certificate"),
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http.StatusInternalServerError, errContext}
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}
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serverCert, err := x509.ParseCertificate(crtBytes)
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if err != nil {
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return nil, nil, &apiError{errors.Wrap(err, "sign: error parsing new leaf certificate"),
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http.StatusInternalServerError, errContext}
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}
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caCert, err := x509.ParseCertificate(issIdentity.Crt.Raw)
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if err != nil {
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return nil, nil, &apiError{errors.Wrap(err, "sign: error parsing intermediate certificate"),
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http.StatusInternalServerError, errContext}
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}
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return serverCert, caCert, nil
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}
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// Renew creates a new Certificate identical to the old certificate, except
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// with a validity window that begins 'now'.
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func (a *Authority) Renew(ocx *x509.Certificate) (*x509.Certificate, *x509.Certificate, error) {
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// Check step provisioner extensions
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if err := a.authorizeRenewal(ocx); err != nil {
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return nil, nil, err
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}
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// Issuer
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issIdentity := a.intermediateIdentity
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// Convert a realx509.Certificate to the step x509 Certificate.
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oldCert, err := stepx509.ParseCertificate(ocx.Raw)
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if err != nil {
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return nil, nil, &apiError{
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errors.Wrap(err, "error converting x509.Certificate to stepx509.Certificate"),
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http.StatusInternalServerError, context{},
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}
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}
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now := time.Now().UTC()
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duration := oldCert.NotAfter.Sub(oldCert.NotBefore)
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newCert := &stepx509.Certificate{
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PublicKey: oldCert.PublicKey,
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Issuer: issIdentity.Crt.Subject,
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Subject: oldCert.Subject,
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NotBefore: now,
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NotAfter: now.Add(duration),
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KeyUsage: oldCert.KeyUsage,
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UnhandledCriticalExtensions: oldCert.UnhandledCriticalExtensions,
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ExtKeyUsage: oldCert.ExtKeyUsage,
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UnknownExtKeyUsage: oldCert.UnknownExtKeyUsage,
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BasicConstraintsValid: oldCert.BasicConstraintsValid,
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IsCA: oldCert.IsCA,
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MaxPathLen: oldCert.MaxPathLen,
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MaxPathLenZero: oldCert.MaxPathLenZero,
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OCSPServer: oldCert.OCSPServer,
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IssuingCertificateURL: oldCert.IssuingCertificateURL,
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DNSNames: oldCert.DNSNames,
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EmailAddresses: oldCert.EmailAddresses,
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IPAddresses: oldCert.IPAddresses,
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URIs: oldCert.URIs,
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PermittedDNSDomainsCritical: oldCert.PermittedDNSDomainsCritical,
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PermittedDNSDomains: oldCert.PermittedDNSDomains,
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ExcludedDNSDomains: oldCert.ExcludedDNSDomains,
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PermittedIPRanges: oldCert.PermittedIPRanges,
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ExcludedIPRanges: oldCert.ExcludedIPRanges,
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PermittedEmailAddresses: oldCert.PermittedEmailAddresses,
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ExcludedEmailAddresses: oldCert.ExcludedEmailAddresses,
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PermittedURIDomains: oldCert.PermittedURIDomains,
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ExcludedURIDomains: oldCert.ExcludedURIDomains,
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CRLDistributionPoints: oldCert.CRLDistributionPoints,
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PolicyIdentifiers: oldCert.PolicyIdentifiers,
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}
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// Copy all extensions except for Authority Key Identifier. This one might
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// be different if we rotate the intermediate certificate and it will cause
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// a TLS bad certificate error.
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for _, ext := range oldCert.Extensions {
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if !ext.Id.Equal(oidAuthorityKeyIdentifier) {
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newCert.ExtraExtensions = append(newCert.ExtraExtensions, ext)
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}
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}
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leaf, err := x509util.NewLeafProfileWithTemplate(newCert,
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issIdentity.Crt, issIdentity.Key)
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if err != nil {
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return nil, nil, &apiError{err, http.StatusInternalServerError, context{}}
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}
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crtBytes, err := leaf.CreateCertificate()
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if err != nil {
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return nil, nil, &apiError{errors.Wrap(err, "error renewing certificate from existing server certificate"),
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http.StatusInternalServerError, context{}}
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}
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serverCert, err := x509.ParseCertificate(crtBytes)
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if err != nil {
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return nil, nil, &apiError{errors.Wrap(err, "error parsing new server certificate"),
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http.StatusInternalServerError, context{}}
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}
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caCert, err := x509.ParseCertificate(issIdentity.Crt.Raw)
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if err != nil {
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return nil, nil, &apiError{errors.Wrap(err, "error parsing intermediate certificate"),
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http.StatusInternalServerError, context{}}
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}
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return serverCert, caCert, nil
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}
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// GetTLSCertificate creates a new leaf certificate to be used by the CA HTTPS server.
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func (a *Authority) GetTLSCertificate() (*tls.Certificate, error) {
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profile, err := x509util.NewLeafProfile("Step Online CA",
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a.intermediateIdentity.Crt, a.intermediateIdentity.Key,
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x509util.WithHosts(strings.Join(a.config.DNSNames, ",")))
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if err != nil {
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return nil, err
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}
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crtBytes, err := profile.CreateCertificate()
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if err != nil {
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return nil, err
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}
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keyPEM, err := pemutil.Serialize(profile.SubjectPrivateKey())
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if err != nil {
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return nil, err
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}
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crtPEM := pem.EncodeToMemory(&pem.Block{
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Type: "CERTIFICATE",
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Bytes: crtBytes,
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})
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// Load the x509 key pair (combining server and intermediate blocks)
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// to a tls.Certificate.
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intermediatePEM, err := pemutil.Serialize(a.intermediateIdentity.Crt)
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if err != nil {
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return nil, err
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}
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tlsCrt, err := tls.X509KeyPair(append(crtPEM,
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pem.EncodeToMemory(intermediatePEM)...),
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pem.EncodeToMemory(keyPEM))
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if err != nil {
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return nil, errors.Wrap(err, "error creating tls certificate")
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}
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// Get the 'leaf' certificate and set the attribute accordingly.
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leaf, err := x509.ParseCertificate(tlsCrt.Certificate[0])
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if err != nil {
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return nil, errors.Wrap(err, "error parsing tls certificate")
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}
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tlsCrt.Leaf = leaf
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return &tlsCrt, nil
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}
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