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