57 lines
1.6 KiB
Go
57 lines
1.6 KiB
Go
package checker
|
|
|
|
import (
|
|
"context"
|
|
"fmt"
|
|
|
|
sdk "git.happydns.org/checker-sdk-go/checker"
|
|
)
|
|
|
|
// ixfrRule flags nameservers that answer IXFR queries with records, which
|
|
// leaks incremental zone content to arbitrary clients.
|
|
type ixfrRule struct{}
|
|
|
|
func (r *ixfrRule) Name() string { return "ns_ixfr_refused" }
|
|
func (r *ixfrRule) Description() string {
|
|
return "Verifies that IXFR zone transfers are refused by every authoritative nameserver"
|
|
}
|
|
|
|
func (r *ixfrRule) Evaluate(ctx context.Context, obs sdk.ObservationGetter, _ sdk.CheckerOptions) []sdk.CheckState {
|
|
report, errSt := loadReport(ctx, obs, "ns_ixfr_error")
|
|
if errSt != nil {
|
|
return []sdk.CheckState{*errSt}
|
|
}
|
|
|
|
servers := probedServers(report)
|
|
if len(servers) == 0 {
|
|
return []sdk.CheckState{noProbesState("ns_ixfr_skipped")}
|
|
}
|
|
|
|
out := make([]sdk.CheckState, 0, len(servers))
|
|
for _, srv := range servers {
|
|
state := sdk.CheckState{
|
|
Subject: serverLabel(srv),
|
|
Meta: serverMeta(srv),
|
|
}
|
|
switch {
|
|
case srv.IXFR.Error != "":
|
|
state.Status = sdk.StatusOK
|
|
state.Code = "ns_ixfr_ok"
|
|
state.Message = fmt.Sprintf("query failed: %s", srv.IXFR.Error)
|
|
case srv.IXFR.Rcode != "NOERROR":
|
|
state.Status = sdk.StatusOK
|
|
state.Code = "ns_ixfr_ok"
|
|
state.Message = fmt.Sprintf("IXFR refused (rcode=%s)", srv.IXFR.Rcode)
|
|
case srv.IXFR.AnswerCount > 0:
|
|
state.Status = sdk.StatusWarn
|
|
state.Code = "ns_ixfr_accepted"
|
|
state.Message = fmt.Sprintf("IXFR accepted with %d answer(s)", srv.IXFR.AnswerCount)
|
|
default:
|
|
state.Status = sdk.StatusOK
|
|
state.Code = "ns_ixfr_ok"
|
|
state.Message = "IXFR refused or empty"
|
|
}
|
|
out = append(out, state)
|
|
}
|
|
return out
|
|
}
|