forked from TrueCloudLab/certificates
cf063d1f4a
This reverts commit e2ba4159c3
.
460 lines
16 KiB
Go
460 lines
16 KiB
Go
package authority
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import (
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"context"
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"crypto"
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"crypto/tls"
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"crypto/x509"
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"encoding/asn1"
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"encoding/base64"
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"encoding/pem"
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"net/http"
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"time"
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"github.com/pkg/errors"
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"github.com/smallstep/certificates/authority/provisioner"
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casapi "github.com/smallstep/certificates/cas/apiv1"
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"github.com/smallstep/certificates/db"
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"github.com/smallstep/certificates/errs"
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"go.step.sm/crypto/jose"
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"go.step.sm/crypto/keyutil"
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"go.step.sm/crypto/pemutil"
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"go.step.sm/crypto/x509util"
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)
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// GetTLSOptions returns the tls options configured.
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func (a *Authority) GetTLSOptions() *TLSOptions {
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return a.config.TLS
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}
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var oidAuthorityKeyIdentifier = asn1.ObjectIdentifier{2, 5, 29, 35}
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var oidSubjectKeyIdentifier = asn1.ObjectIdentifier{2, 5, 29, 14}
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func withDefaultASN1DN(def *ASN1DN) provisioner.CertificateModifierFunc {
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return func(crt *x509.Certificate, opts provisioner.SignOptions) 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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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 provisioner.SignOptions, extraOpts ...provisioner.SignOption) ([]*x509.Certificate, error) {
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var (
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certOptions []x509util.Option
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certValidators []provisioner.CertificateValidator
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certModifiers []provisioner.CertificateModifier
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certEnforcers []provisioner.CertificateEnforcer
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)
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opts := []interface{}{errs.WithKeyVal("csr", csr), errs.WithKeyVal("signOptions", signOpts)}
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if err := csr.CheckSignature(); err != nil {
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return nil, errs.Wrap(http.StatusBadRequest, err, "authority.Sign; invalid certificate request", opts...)
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}
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// Set backdate with the configured value
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signOpts.Backdate = a.config.AuthorityConfig.Backdate.Duration
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for _, op := range extraOpts {
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switch k := op.(type) {
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// Adds new options to NewCertificate
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case provisioner.CertificateOptions:
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certOptions = append(certOptions, k.Options(signOpts)...)
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// Validate the given certificate request.
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case provisioner.CertificateRequestValidator:
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if err := k.Valid(csr); err != nil {
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return nil, errs.Wrap(http.StatusUnauthorized, err, "authority.Sign", opts...)
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}
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// Validates the unsigned certificate template.
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case provisioner.CertificateValidator:
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certValidators = append(certValidators, k)
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// Modifies a certificate before validating it.
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case provisioner.CertificateModifier:
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certModifiers = append(certModifiers, k)
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// Modifies a certificate after validating it.
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case provisioner.CertificateEnforcer:
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certEnforcers = append(certEnforcers, k)
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default:
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return nil, errs.InternalServer("authority.Sign; invalid extra option type %T", append([]interface{}{k}, opts...)...)
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}
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}
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cert, err := x509util.NewCertificate(csr, certOptions...)
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if err != nil {
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if _, ok := err.(*x509util.TemplateError); ok {
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return nil, errs.NewErr(http.StatusBadRequest, err,
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errs.WithMessage(err.Error()),
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errs.WithKeyVal("csr", csr),
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errs.WithKeyVal("signOptions", signOpts),
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)
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}
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return nil, errs.Wrap(http.StatusInternalServerError, err, "authority.Sign", opts...)
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}
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// Certificate modifiers before validation
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leaf := cert.GetCertificate()
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// Set default subject
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if err := withDefaultASN1DN(a.config.AuthorityConfig.Template).Modify(leaf, signOpts); err != nil {
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return nil, errs.Wrap(http.StatusUnauthorized, err, "authority.Sign", opts...)
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}
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for _, m := range certModifiers {
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if err := m.Modify(leaf, signOpts); err != nil {
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return nil, errs.Wrap(http.StatusUnauthorized, err, "authority.Sign", opts...)
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}
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}
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// Certificate validation.
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for _, v := range certValidators {
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if err := v.Valid(leaf, signOpts); err != nil {
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return nil, errs.Wrap(http.StatusUnauthorized, err, "authority.Sign", opts...)
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}
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}
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// Certificate modifiers after validation
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for _, m := range certEnforcers {
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if err := m.Enforce(leaf); err != nil {
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return nil, errs.Wrap(http.StatusUnauthorized, err, "authority.Sign", opts...)
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}
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}
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lifetime := leaf.NotAfter.Sub(leaf.NotBefore.Add(signOpts.Backdate))
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resp, err := a.x509CAService.CreateCertificate(&casapi.CreateCertificateRequest{
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Template: leaf,
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Lifetime: lifetime,
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Backdate: signOpts.Backdate,
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})
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if err != nil {
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return nil, errs.Wrap(http.StatusInternalServerError, err, "authority.Sign; error creating certificate", opts...)
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}
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if err = a.db.StoreCertificate(resp.Certificate); err != nil {
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if err != db.ErrNotImplemented {
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return nil, errs.Wrap(http.StatusInternalServerError, err,
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"authority.Sign; error storing certificate in db", opts...)
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}
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}
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return append([]*x509.Certificate{resp.Certificate}, resp.CertificateChain...), 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(oldCert *x509.Certificate) ([]*x509.Certificate, error) {
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return a.Rekey(oldCert, nil)
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}
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// Rekey is used for rekeying and renewing based on the public key.
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// If the public key is 'nil' then it's assumed that the cert should be renewed
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// using the existing public key. If the public key is not 'nil' then it's
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// assumed that the cert should be rekeyed.
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// For both Rekey and Renew all other attributes of the new certificate should
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// match the old certificate. The exceptions are 'AuthorityKeyId' (which may
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// have changed), 'SubjectKeyId' (different in case of rekey), and
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// 'NotBefore/NotAfter' (the validity duration of the new certificate should be
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// equal to the old one, but starting 'now').
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func (a *Authority) Rekey(oldCert *x509.Certificate, pk crypto.PublicKey) ([]*x509.Certificate, error) {
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isRekey := (pk != nil)
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opts := []interface{}{errs.WithKeyVal("serialNumber", oldCert.SerialNumber.String())}
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// Check step provisioner extensions
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if err := a.authorizeRenew(oldCert); err != nil {
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return nil, errs.Wrap(http.StatusInternalServerError, err, "authority.Rekey", opts...)
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}
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// Durations
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backdate := a.config.AuthorityConfig.Backdate.Duration
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duration := oldCert.NotAfter.Sub(oldCert.NotBefore)
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lifetime := duration - backdate
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// Create new certificate from previous values.
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// Issuer, NotBefore, NotAfter and SubjectKeyId will be set by the CAS.
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newCert := &x509.Certificate{
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Subject: oldCert.Subject,
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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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PermittedDNSDomainsCritical: oldCert.PermittedDNSDomainsCritical,
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PermittedEmailAddresses: oldCert.PermittedEmailAddresses,
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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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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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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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if isRekey {
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newCert.PublicKey = pk
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} else {
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newCert.PublicKey = oldCert.PublicKey
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}
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// Copy all extensions except:
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//
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// 1. Authority Key Identifier - This one might be different if we rotate
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// the intermediate certificate and it will cause a TLS bad certificate
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// error.
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//
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// 2. Subject Key Identifier, if rekey - For rekey, SubjectKeyIdentifier
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// extension will be calculated for the new public key by
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// x509util.CreateCertificate()
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for _, ext := range oldCert.Extensions {
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if ext.Id.Equal(oidAuthorityKeyIdentifier) {
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continue
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}
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if ext.Id.Equal(oidSubjectKeyIdentifier) && isRekey {
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newCert.SubjectKeyId = nil
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continue
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}
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newCert.ExtraExtensions = append(newCert.ExtraExtensions, ext)
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}
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resp, err := a.x509CAService.RenewCertificate(&casapi.RenewCertificateRequest{
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Template: newCert,
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Lifetime: lifetime,
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Backdate: backdate,
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})
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if err != nil {
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return nil, errs.Wrap(http.StatusInternalServerError, err, "authority.Rekey", opts...)
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}
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if err = a.db.StoreCertificate(resp.Certificate); err != nil {
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if err != db.ErrNotImplemented {
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return nil, errs.Wrap(http.StatusInternalServerError, err, "authority.Rekey; error storing certificate in db", opts...)
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}
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}
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return append([]*x509.Certificate{resp.Certificate}, resp.CertificateChain...), nil
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}
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// RevokeOptions are the options for the Revoke API.
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type RevokeOptions struct {
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Serial string
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Reason string
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ReasonCode int
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PassiveOnly bool
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MTLS bool
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Crt *x509.Certificate
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OTT string
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}
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// Revoke revokes a certificate.
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//
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// NOTE: Only supports passive revocation - prevent existing certificates from
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// being renewed.
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//
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// TODO: Add OCSP and CRL support.
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func (a *Authority) Revoke(ctx context.Context, revokeOpts *RevokeOptions) error {
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opts := []interface{}{
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errs.WithKeyVal("serialNumber", revokeOpts.Serial),
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errs.WithKeyVal("reasonCode", revokeOpts.ReasonCode),
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errs.WithKeyVal("reason", revokeOpts.Reason),
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errs.WithKeyVal("passiveOnly", revokeOpts.PassiveOnly),
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errs.WithKeyVal("MTLS", revokeOpts.MTLS),
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errs.WithKeyVal("context", provisioner.MethodFromContext(ctx).String()),
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}
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if revokeOpts.MTLS {
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opts = append(opts, errs.WithKeyVal("certificate", base64.StdEncoding.EncodeToString(revokeOpts.Crt.Raw)))
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} else {
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opts = append(opts, errs.WithKeyVal("token", revokeOpts.OTT))
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}
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rci := &db.RevokedCertificateInfo{
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Serial: revokeOpts.Serial,
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ReasonCode: revokeOpts.ReasonCode,
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Reason: revokeOpts.Reason,
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MTLS: revokeOpts.MTLS,
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RevokedAt: time.Now().UTC(),
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}
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var (
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p provisioner.Interface
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err error
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)
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// If not mTLS then get the TokenID of the token.
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if !revokeOpts.MTLS {
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token, err := jose.ParseSigned(revokeOpts.OTT)
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if err != nil {
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return errs.Wrap(http.StatusUnauthorized, err,
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"authority.Revoke; error parsing token", opts...)
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}
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// Get claims w/out verification.
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var claims Claims
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if err = token.UnsafeClaimsWithoutVerification(&claims); err != nil {
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return errs.Wrap(http.StatusUnauthorized, err, "authority.Revoke", opts...)
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}
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// This method will also validate the audiences for JWK provisioners.
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var ok bool
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p, ok = a.provisioners.LoadByToken(token, &claims.Claims)
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if !ok {
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return errs.InternalServer("authority.Revoke; provisioner not found", opts...)
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}
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rci.TokenID, err = p.GetTokenID(revokeOpts.OTT)
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if err != nil {
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return errs.Wrap(http.StatusInternalServerError, err,
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"authority.Revoke; could not get ID for token")
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}
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opts = append(opts, errs.WithKeyVal("tokenID", rci.TokenID))
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} else {
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// Load the Certificate provisioner if one exists.
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p, err = a.LoadProvisionerByCertificate(revokeOpts.Crt)
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if err != nil {
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return errs.Wrap(http.StatusUnauthorized, err,
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"authority.Revoke: unable to load certificate provisioner", opts...)
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}
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}
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rci.ProvisionerID = p.GetID()
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opts = append(opts, errs.WithKeyVal("provisionerID", rci.ProvisionerID))
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if provisioner.MethodFromContext(ctx) == provisioner.SSHRevokeMethod {
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err = a.db.RevokeSSH(rci)
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} else {
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// Revoke an X.509 certificate using CAS. If the certificate is not
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// provided we will try to read it from the db. If the read fails we
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// won't throw an error as it will be responsibility of the CAS
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// implementation to require a certificate.
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var revokedCert *x509.Certificate
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if revokeOpts.Crt != nil {
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revokedCert = revokeOpts.Crt
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} else if rci.Serial != "" {
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revokedCert, _ = a.db.GetCertificate(rci.Serial)
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}
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// CAS operation, note that SoftCAS (default) is a noop.
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// The revoke happens when this is stored in the db.
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_, err = a.x509CAService.RevokeCertificate(&casapi.RevokeCertificateRequest{
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Certificate: revokedCert,
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Reason: rci.Reason,
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ReasonCode: rci.ReasonCode,
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})
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if err != nil {
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return errs.Wrap(http.StatusInternalServerError, err, "authority.Revoke", opts...)
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}
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// Save as revoked in the Db.
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err = a.db.Revoke(rci)
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}
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switch err {
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case nil:
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return nil
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case db.ErrNotImplemented:
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return errs.NotImplemented("authority.Revoke; no persistence layer configured", opts...)
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case db.ErrAlreadyExists:
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return errs.BadRequest("authority.Revoke; certificate with serial "+
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"number %s has already been revoked", append([]interface{}{rci.Serial}, opts...)...)
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default:
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return errs.Wrap(http.StatusInternalServerError, err, "authority.Revoke", opts...)
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}
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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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fatal := func(err error) (*tls.Certificate, error) {
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return nil, errs.Wrap(http.StatusInternalServerError, err, "authority.GetTLSCertificate")
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}
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// Generate default key.
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priv, err := keyutil.GenerateDefaultKey()
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if err != nil {
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return fatal(err)
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}
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signer, ok := priv.(crypto.Signer)
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if !ok {
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return fatal(errors.New("private key is not a crypto.Signer"))
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}
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// Create initial certificate request.
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cr, err := x509util.CreateCertificateRequest("Step Online CA", a.config.DNSNames, signer)
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if err != nil {
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return fatal(err)
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}
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// Generate certificate template directly from the certificate request.
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template, err := x509util.NewCertificate(cr)
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if err != nil {
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return fatal(err)
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}
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// Get x509 certificate template, set validity and sign it.
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now := time.Now()
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certTpl := template.GetCertificate()
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certTpl.NotBefore = now.Add(-1 * time.Minute)
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certTpl.NotAfter = now.Add(24 * time.Hour)
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resp, err := a.x509CAService.CreateCertificate(&casapi.CreateCertificateRequest{
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Template: certTpl,
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Lifetime: 24 * time.Hour,
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Backdate: 1 * time.Minute,
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})
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if err != nil {
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return fatal(err)
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}
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// Generate PEM blocks to create tls.Certificate
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pemBlocks := pem.EncodeToMemory(&pem.Block{
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Type: "CERTIFICATE",
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Bytes: resp.Certificate.Raw,
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})
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for _, crt := range resp.CertificateChain {
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pemBlocks = append(pemBlocks, pem.EncodeToMemory(&pem.Block{
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Type: "CERTIFICATE",
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Bytes: crt.Raw,
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})...)
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}
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keyPEM, err := pemutil.Serialize(priv)
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if err != nil {
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return fatal(err)
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}
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tlsCrt, err := tls.X509KeyPair(pemBlocks, pem.EncodeToMemory(keyPEM))
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if err != nil {
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return fatal(err)
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}
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// Set leaf certificate
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tlsCrt.Leaf = resp.Certificate
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return &tlsCrt, nil
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}
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