certificates/api/sshRenew.go

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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 {
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WriteError(w, errs.UnauthorizedErr(err))
return
}
oldCert, _, err := provisioner.ExtractSSHPOPCert(body.OTT)
if err != nil {
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WriteError(w, errs.InternalServerErr(err))
}
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
}
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JSONStatus(w, &SSHSignResponse{
Certificate: SSHCertificate{newCert},
IdentityCertificate: identity,
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}, 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
}