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, r, errs.BadRequestErr(err, "error reading request body")) return } logOtt(w, body.OTT) if err := body.Validate(); err != nil { render.Error(w, r, err) return } publicKey, err := ssh.ParsePublicKey(body.PublicKey) if err != nil { render.Error(w, r, 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, r, errs.UnauthorizedErr(err)) return } oldCert, _, err := provisioner.ExtractSSHPOPCert(body.OTT) if err != nil { render.Error(w, r, errs.InternalServerErr(err)) return } newCert, err := a.RekeySSH(ctx, oldCert, publicKey, signOpts...) if err != nil { render.Error(w, r, 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, r, errs.ForbiddenErr(err, "error renewing identity certificate")) return } LogSSHCertificate(w, newCert) render.JSONStatus(w, r, &SSHRekeyResponse{ Certificate: SSHCertificate{newCert}, IdentityCertificate: identity, }, http.StatusCreated) }