sshpop provisioner + ssh renew | revoke | rekey first pass

api/sshRekey.go

@@ -0,0 +1,78 @@
+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},
+	})
+}