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A request over a rate limit is refused with SWWAF_BAN_RESPONSE and bans the client's netblock: an hour at first, three times the last ban when broken again within a day of its end, permanent past seven days. The ban ledger in internal/bans is checked after the static lists and before the lookup, and the requests it refuses are not counted. A ban resets the client's counters and carries notes; at most SWWAF_MAX_BANS are held. SWWAF_BAN_RESPONSE also answers SWWAF_DENY_NETS and the country lists. Deviation: the notes hold the request that broke the limit, not the last ten. Judgement call: the six ban settings cannot be off. Judgement call: a permanent ban's ban_expires is "permanent". Model: opus-5-5
72 lines
2.0 KiB
Go
72 lines
2.0 KiB
Go
package proxy_test
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import (
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"net/http"
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"sync/atomic"
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"testing"
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"sneak.berlin/go/smallwebwaf/internal/requestlog"
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)
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// minute is the window of SWWAF_RATE_LIMIT_PER_MINUTE, as a log line's
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// limit_hit names it.
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const minute = "minute"
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func TestRateLimitRefusesBeforeTheApp(t *testing.T) {
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t.Parallel()
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var calls atomic.Int32
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app := startApp(t, func(http.ResponseWriter, *http.Request) {
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calls.Add(1)
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})
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addr, out := startProxy(t, app.URL, map[string]string{
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trustedProxies: trustLocalhost,
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rateLimitPerMinute: "1",
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})
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const otherClient = "203.0.113.10"
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// With a limit of one request a minute, a client's second request is
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// refused, with 403 by default. A client is one IPv4 address, or one
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// IPv6 /64; an IPv4 address in IPv6 form is that IPv4 address.
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requests := []struct {
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client string // as X-Forwarded-For names it
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logged string // as the log line's client_ip names it
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want int
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}{
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{client, client, http.StatusOK},
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{client, client, http.StatusForbidden},
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{otherClient, otherClient, http.StatusOK},
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{"::ffff:" + otherClient, otherClient, http.StatusForbidden},
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{"2001:db8::1", "2001:db8::1", http.StatusOK},
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{"2001:db8::8000:0:0:1", "2001:db8::8000:0:0:1", http.StatusForbidden},
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{"2001:db8:0:1::1", "2001:db8:0:1::1", http.StatusOK},
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}
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for i, sent := range requests {
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req := newRequest(t, http.MethodGet, addr, "/", http.NoBody)
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req.Header.Set(forwardedFor, sent.client)
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wantStatus(t, do(t, req), sent.want)
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line := out.requestLines(t, i+1)[i]
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if line.ClientIP != sent.logged {
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t.Errorf("log line has client_ip %q, want %q", line.ClientIP, sent.logged)
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}
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if sent.want == http.StatusOK {
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wantLine(t, line, http.StatusOK, requestlog.ActionForward)
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} else {
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wantLine(t, line, http.StatusForbidden, requestlog.ActionRateLimited)
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if line.LimitHit != minute {
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t.Errorf("log line has limit_hit %q, want minute", line.LimitHit)
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}
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}
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}
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if calls.Load() != 4 {
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t.Errorf("the app was called %d times, want 4", calls.Load())
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}
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}
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