certificates/api/sshRekey.go

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package api
import (
"context"
"net/http"
"github.com/pkg/errors"
"github.com/smallstep/certificates/authority/provisioner"
"golang.org/x/crypto/ssh"
)
// SSHRekeyRequest is the request body of an SSH certificate request.
type SSHRekeyRequest struct {
OTT string `json:"ott"`
PublicKey []byte `json:"publicKey"` //base64 encoded
}
// Validate validates the SSHSignRekey.
func (s *SSHRekeyRequest) Validate() error {
switch {
case len(s.OTT) == 0:
return errors.New("missing or empty ott")
case len(s.PublicKey) == 0:
return errors.New("missing or empty public key")
default:
return nil
}
}
// SSHRekeyResponse is the response object that returns the SSH certificate.
type SSHRekeyResponse struct {
Certificate SSHCertificate `json:"crt"`
}
// SSHRekey is an HTTP handler that reads an RekeySSHRequest with a one-time-token
// (ott) from the body and creates a new SSH certificate with the information in
// the request.
func (h *caHandler) SSHRekey(w http.ResponseWriter, r *http.Request) {
var body SSHRekeyRequest
if err := ReadJSON(r.Body, &body); err != nil {
WriteError(w, BadRequest(errors.Wrap(err, "error reading request body")))
return
}
logOtt(w, body.OTT)
if err := body.Validate(); err != nil {
WriteError(w, BadRequest(err))
return
}
publicKey, err := ssh.ParsePublicKey(body.PublicKey)
if err != nil {
WriteError(w, BadRequest(errors.Wrap(err, "error parsing publicKey")))
return
}
ctx := provisioner.NewContextWithMethod(context.Background(), provisioner.RekeySSHMethod)
signOpts, err := h.Authority.Authorize(ctx, body.OTT)
if err != nil {
WriteError(w, Unauthorized(err))
return
}
oldCert, err := provisioner.ExtractSSHPOPCert(body.OTT)
if err != nil {
WriteError(w, InternalServerError(err))
}
newCert, err := h.Authority.RekeySSH(oldCert, publicKey, signOpts...)
if err != nil {
WriteError(w, Forbidden(err))
return
}
w.WriteHeader(http.StatusCreated)
JSON(w, &SSHSignResponse{
Certificate: SSHCertificate{newCert},
})
}