package authority import ( "context" "crypto/tls" "crypto/x509" "encoding/asn1" "encoding/base64" "encoding/pem" "net/http" "strings" "time" "github.com/pkg/errors" "github.com/smallstep/certificates/authority/provisioner" "github.com/smallstep/certificates/db" "github.com/smallstep/cli/crypto/pemutil" "github.com/smallstep/cli/crypto/tlsutil" "github.com/smallstep/cli/crypto/x509util" "github.com/smallstep/cli/jose" ) // GetTLSOptions returns the tls options configured. func (a *Authority) GetTLSOptions() *tlsutil.TLSOptions { return a.config.TLS } var oidAuthorityKeyIdentifier = asn1.ObjectIdentifier{2, 5, 29, 35} 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, signOpts provisioner.Options, extraOpts ...provisioner.SignOption) ([]*x509.Certificate, error) { var ( errContext = apiCtx{"csr": csr, "signOptions": signOpts} mods = []x509util.WithOption{withDefaultASN1DN(a.config.AuthorityConfig.Template)} certValidators = []provisioner.CertificateValidator{} issIdentity = a.intermediateIdentity ) for _, op := range extraOpts { switch k := op.(type) { case provisioner.CertificateValidator: certValidators = append(certValidators, k) case provisioner.CertificateRequestValidator: if err := k.Valid(csr); err != nil { return nil, &apiError{errors.Wrap(err, "sign"), http.StatusUnauthorized, errContext} } case provisioner.ProfileModifier: mods = append(mods, k.Option(signOpts)) default: return nil, &apiError{errors.Errorf("sign: invalid extra option type %T", k), http.StatusInternalServerError, errContext} } } if err := csr.CheckSignature(); err != nil { return nil, &apiError{errors.Wrap(err, "sign: invalid certificate request"), http.StatusBadRequest, errContext} } leaf, err := x509util.NewLeafProfileWithCSR(csr, issIdentity.Crt, issIdentity.Key, mods...) if err != nil { return nil, &apiError{errors.Wrapf(err, "sign"), http.StatusInternalServerError, errContext} } for _, v := range certValidators { if err := v.Valid(leaf.Subject()); err != nil { return nil, &apiError{errors.Wrap(err, "sign"), http.StatusUnauthorized, errContext} } } crtBytes, err := leaf.CreateCertificate() if err != nil { return nil, &apiError{errors.Wrap(err, "sign: error creating new leaf certificate"), http.StatusInternalServerError, errContext} } serverCert, err := x509.ParseCertificate(crtBytes) if err != nil { return nil, &apiError{errors.Wrap(err, "sign: error parsing new leaf certificate"), http.StatusInternalServerError, errContext} } caCert, err := x509.ParseCertificate(issIdentity.Crt.Raw) if err != nil { return nil, &apiError{errors.Wrap(err, "sign: error parsing intermediate certificate"), http.StatusInternalServerError, errContext} } if err = a.db.StoreCertificate(serverCert); err != nil { if err != db.ErrNotImplemented { return nil, &apiError{errors.Wrap(err, "sign: error storing certificate in db"), http.StatusInternalServerError, errContext} } } return []*x509.Certificate{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(oldCert *x509.Certificate) ([]*x509.Certificate, error) { // Check step provisioner extensions if err := a.authorizeRenew(oldCert); err != nil { return nil, err } // Issuer issIdentity := a.intermediateIdentity now := time.Now().UTC() duration := oldCert.NotAfter.Sub(oldCert.NotBefore) newCert := &x509.Certificate{ PublicKey: oldCert.PublicKey, Issuer: issIdentity.Crt.Subject, Subject: oldCert.Subject, NotBefore: now, NotAfter: now.Add(duration), KeyUsage: oldCert.KeyUsage, 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, } // Copy all extensions except for Authority Key Identifier. This one might // be different if we rotate the intermediate certificate and it will cause // a TLS bad certificate error. for _, ext := range oldCert.Extensions { if !ext.Id.Equal(oidAuthorityKeyIdentifier) { newCert.ExtraExtensions = append(newCert.ExtraExtensions, ext) } } leaf, err := x509util.NewLeafProfileWithTemplate(newCert, issIdentity.Crt, issIdentity.Key) if err != nil { return nil, &apiError{err, http.StatusInternalServerError, apiCtx{}} } crtBytes, err := leaf.CreateCertificate() if err != nil { return nil, &apiError{errors.Wrap(err, "error renewing certificate from existing server certificate"), http.StatusInternalServerError, apiCtx{}} } serverCert, err := x509.ParseCertificate(crtBytes) if err != nil { return nil, &apiError{errors.Wrap(err, "error parsing new server certificate"), http.StatusInternalServerError, apiCtx{}} } caCert, err := x509.ParseCertificate(issIdentity.Crt.Raw) if err != nil { return nil, &apiError{errors.Wrap(err, "error parsing intermediate certificate"), http.StatusInternalServerError, apiCtx{}} } return []*x509.Certificate{serverCert, caCert}, nil } // RevokeOptions are the options for the Revoke API. type RevokeOptions struct { Serial string Reason string ReasonCode int PassiveOnly bool MTLS bool Crt *x509.Certificate OTT string } // Revoke revokes a certificate. // // NOTE: Only supports passive revocation - prevent existing certificates from // being renewed. // // TODO: Add OCSP and CRL support. func (a *Authority) Revoke(ctx context.Context, opts *RevokeOptions) error { errContext := apiCtx{ "serialNumber": opts.Serial, "reasonCode": opts.ReasonCode, "reason": opts.Reason, "passiveOnly": opts.PassiveOnly, "mTLS": opts.MTLS, "context": string(provisioner.MethodFromContext(ctx)), } if opts.MTLS { errContext["certificate"] = base64.StdEncoding.EncodeToString(opts.Crt.Raw) } else { errContext["ott"] = opts.OTT } rci := &db.RevokedCertificateInfo{ Serial: opts.Serial, ReasonCode: opts.ReasonCode, Reason: opts.Reason, MTLS: opts.MTLS, RevokedAt: time.Now().UTC(), } var ( p provisioner.Interface err error ) // If not mTLS then get the TokenID of the token. if !opts.MTLS { // Validate payload token, err := jose.ParseSigned(opts.OTT) if err != nil { return &apiError{errors.Wrapf(err, "revoke: error parsing token"), http.StatusUnauthorized, errContext} } // Get claims w/out verification. We should have already verified this token // earlier with a call to authorizeSSHRevoke. var claims Claims if err = token.UnsafeClaimsWithoutVerification(&claims); err != nil { return &apiError{errors.Wrap(err, "revoke"), http.StatusUnauthorized, errContext} } // This method will also validate the audiences for JWK provisioners. var ok bool p, ok = a.provisioners.LoadByToken(token, &claims.Claims) if !ok { return &apiError{ errors.Errorf("revoke: provisioner not found"), http.StatusInternalServerError, errContext} } rci.TokenID, err = p.GetTokenID(opts.OTT) if err != nil { return &apiError{errors.Wrap(err, "revoke: could not get ID for token"), http.StatusInternalServerError, errContext} } errContext["tokenID"] = rci.TokenID } else { // Load the Certificate provisioner if one exists. p, err = a.LoadProvisionerByCertificate(opts.Crt) if err != nil { return &apiError{ errors.Wrap(err, "revoke: unable to load certificate provisioner"), http.StatusUnauthorized, errContext} } } rci.ProvisionerID = p.GetID() errContext["provisionerID"] = rci.ProvisionerID if provisioner.MethodFromContext(ctx) == provisioner.RevokeSSHMethod { err = a.db.RevokeSSH(rci) } else { // default to revoke x509 err = a.db.Revoke(rci) } switch err { case nil: return nil case db.ErrNotImplemented: return &apiError{errors.New("revoke: no persistence layer configured"), http.StatusNotImplemented, errContext} case db.ErrAlreadyExists: return &apiError{errors.Errorf("revoke: certificate with serial number %s has already been revoked", rci.Serial), http.StatusBadRequest, errContext} default: return &apiError{err, http.StatusInternalServerError, errContext} } } // 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 }