sneak
d8fefb1288
check / check (push) In progress
Rename too_large, rate_limited, rule_blocked and denied, and split banned into temporarily_banned and permanently_banned by whether the ban runs out. A client under both a temporary and a permanent ban gets the permanent one. A request that makes a ban permanent gets permanently_banned. A ban rule, a trap path or a CrowdSec decision gets the value for the ban it makes, and in observe mode would_action names the ban enforce mode would have made. The offence kind rule_blocked follows, as a metric label and a key in clients.json. Model: opus-5-5
44 lines
1.3 KiB
Go
44 lines
1.3 KiB
Go
package discriminator
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// The heuristic dnsbl. It reads SWW_REPUTATION_ACTION, and the DNSBL zones'
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// verdicts through the DNSBL checker.
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import (
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"context"
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"strings"
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"time"
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"sneak.berlin/go/smallwebwaf/internal/config"
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"sneak.berlin/go/smallwebwaf/internal/requestlog"
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)
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// dnsbl notes the DNSBL zones whose verdict lists the client, as noteListed
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// does, adds the tag dnsbl=<zone> for each, the zone's key masked, and refuses
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// the request when SWW_REPUTATION_ACTION is deny. Being
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// limit, it lowers the client's limits instead (see limitPercentages), and
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// being log, it does nothing more. A zone without a verdict on the client is
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// asked about it in the background, and the request does not wait for the
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// answer. Its figure is the zones that list the client, their keys masked.
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type dnsbl struct{}
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func (dnsbl) name() string { return "dnsbl" }
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func (dnsbl) check(ctx context.Context, rq *request, _ time.Time) *verdict {
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listedBy := rq.h.dnsbl.ListedBy(ctx, rq.client)
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rq.dnsblListed = len(listedBy) > 0
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rq.noteListed(listedBy, "listed by a DNSBL zone")
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for _, zone := range listedBy {
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rq.addTag(config.DNSBLTagPrefix + strings.ToLower(zone))
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}
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if !rq.dnsblListed || rq.h.config.ReputationAction != deny {
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return nil
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}
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return &verdict{
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action: requestlog.ActionClientDenied,
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figures: map[string]any{"zones": listedBy},
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}
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}
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