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package api
import (
"net/http"
"time"
"golang.org/x/crypto/ssh"
"github.com/smallstep/certificates/api/read"
"github.com/smallstep/certificates/api/render"
"github.com/smallstep/certificates/authority/provisioner"
"github.com/smallstep/certificates/errs"
)
// 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 s.OTT == "":
return errs.BadRequest("missing or empty ott")
case len(s.PublicKey) == 0:
return errs.BadRequest("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"`
IdentityCertificate []Certificate `json:"identityCrt,omitempty"`
}
// 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 SSHRekey(w http.ResponseWriter, r *http.Request) {
var body SSHRekeyRequest
if err := read.JSON(r.Body, &body); err != nil {
render.Error(w, errs.BadRequestErr(err, "error reading request body"))
return
}
logOtt(w, body.OTT)
if err := body.Validate(); err != nil {
render.Error(w, err)
return
}
publicKey, err := ssh.ParsePublicKey(body.PublicKey)
if err != nil {
render.Error(w, errs.BadRequestErr(err, "error parsing publicKey"))
return
}
ctx := provisioner.NewContextWithMethod(r.Context(), provisioner.SSHRekeyMethod)
ctx = provisioner.NewContextWithToken(ctx, body.OTT)
a := mustAuthority(ctx)
signOpts, err := a.Authorize(ctx, body.OTT)
if err != nil {
render.Error(w, errs.UnauthorizedErr(err))
return
}
oldCert, _, err := provisioner.ExtractSSHPOPCert(body.OTT)
if err != nil {
render.Error(w, errs.InternalServerErr(err))
return
}
newCert, err := a.RekeySSH(ctx, oldCert, publicKey, signOpts...)
if err != nil {
render.Error(w, errs.ForbiddenErr(err, "error rekeying 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 := renewIdentityCertificate(r, notBefore, notAfter)
if err != nil {
render.Error(w, errs.ForbiddenErr(err, "error renewing identity certificate"))
return
}
render.JSONStatus(w, &SSHRekeyResponse{
Certificate: SSHCertificate{newCert},
IdentityCertificate: identity,
}, http.StatusCreated)
}
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