sneak
3fc63a1e40
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The command is now `sww waf`, and the package is `internal/waf`. Types, functions, files, tests, comments, docs, the Dockerfile, the runit script, `script/`, compose examples, the log field `waf_line` and the `X-From-Waf` test header follow. No behaviour changes, and no setting changes name: rproxy already finds the waf through `SWRP_WAF_BACKEND`. Done with one `sed -i` (Discriminator and DISCRIMINATOR to WAF, discriminator to waf) over the files `git grep -i discriminator` listed, as sneak allowed for this rename, then `git mv` for the package and files. Model: opus-5-5
38 lines
1.1 KiB
Go
38 lines
1.1 KiB
Go
package waf
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// The heuristic trap_paths. It reads SWW_TRAP_PATHS.
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import (
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"context"
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"slices"
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"time"
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"sneak.berlin/go/smallwebwaf/internal/bans"
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"sneak.berlin/go/smallwebwaf/internal/rules"
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)
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// trapPaths refuses a request for a path in SWW_TRAP_PATHS: its path as a
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// path rule sees it, without the query, as sent or once percent-decoded, is one
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// of them. Such a request is a clear sign of attack, as a ban rule's match is:
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// it bans the client's netblock, or in observe mode raises the alert for the
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// ban it would have made. The ban's notes give the path as sent, and so does
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// its figure.
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type trapPaths struct{}
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func (trapPaths) name() string { return "trap_paths" }
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func (trapPaths) check(_ context.Context, rq *request, now time.Time) *verdict {
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path := rules.Path(rq.in)
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if !slices.Contains(rq.h.config.TrapPaths, path) &&
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!slices.Contains(rq.h.config.TrapPaths, rules.DecodeOnce(path)) {
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return nil
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}
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rq.attack = true
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return &verdict{
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action: rq.banForAttack(now, bans.Notes{TrapPath: path}),
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figures: map[string]any{"path": path},
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}
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}
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