package api import ( "crypto/x509" "net/http" "time" "github.com/pkg/errors" "github.com/smallstep/certificates/authority/provisioner" "github.com/smallstep/certificates/errs" ) // SSHRenewRequest is the request body of an SSH certificate request. type SSHRenewRequest struct { OTT string `json:"ott"` } // Validate validates the SSHSignRequest. func (s *SSHRenewRequest) Validate() error { switch { case s.OTT == "": return errs.BadRequest("missing or empty ott") default: return nil } } // SSHRenewResponse is the response object that returns the SSH certificate. type SSHRenewResponse struct { Certificate SSHCertificate `json:"crt"` IdentityCertificate []Certificate `json:"identityCrt,omitempty"` } // SSHRenew is an HTTP handler that reads an RenewSSHRequest with a one-time-token // (ott) from the body and creates a new SSH certificate with the information in // the request. func (h *caHandler) SSHRenew(w http.ResponseWriter, r *http.Request) { var body SSHRenewRequest if err := ReadJSON(r.Body, &body); err != nil { WriteError(w, errs.BadRequestErr(err, "error reading request body")) return } logOtt(w, body.OTT) if err := body.Validate(); err != nil { WriteError(w, err) return } ctx := provisioner.NewContextWithMethod(r.Context(), provisioner.SSHRenewMethod) _, err := h.Authority.Authorize(ctx, body.OTT) if err != nil { WriteError(w, errs.UnauthorizedErr(err)) return } oldCert, _, err := provisioner.ExtractSSHPOPCert(body.OTT) if err != nil { WriteError(w, errs.InternalServerErr(err, "error extraction ssh certificate")) } newCert, err := h.Authority.RenewSSH(ctx, oldCert) if err != nil { WriteError(w, errs.ForbiddenErr(err, "error signing ssh certificate")) return } // Match identity cert with the SSH cert notBefore := time.Unix(int64(oldCert.ValidAfter), 0) notAfter := time.Unix(int64(oldCert.ValidBefore), 0) identity, err := h.renewIdentityCertificate(r, notBefore, notAfter) if err != nil { WriteError(w, errs.ForbiddenErr(err, "error signing identity certificate")) return } JSONStatus(w, &SSHSignResponse{ Certificate: SSHCertificate{newCert}, IdentityCertificate: identity, }, http.StatusCreated) } // renewIdentityCertificate request the client TLS certificate if present. If notBefore and notAfter are passed the func (h *caHandler) renewIdentityCertificate(r *http.Request, notBefore, notAfter time.Time) ([]Certificate, error) { if r.TLS == nil || len(r.TLS.PeerCertificates) == 0 { return nil, nil } // Clone the certificate as we can modify it. cert, err := x509.ParseCertificate(r.TLS.PeerCertificates[0].Raw) if err != nil { return nil, errors.Wrap(err, "error parsing client certificate") } // Enforce the cert to match another certificate, for example an ssh // certificate. if !notBefore.IsZero() { cert.NotBefore = notBefore } if !notAfter.IsZero() { cert.NotAfter = notAfter } certChain, err := h.Authority.Renew(cert) if err != nil { return nil, err } return certChainToPEM(certChain), nil }