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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 holding the request that broke the limit, as SPEC.md now says. At most SWWAF_MAX_BANS are held. SWWAF_BAN_RESPONSE also answers SWWAF_DENY_NETS and the country lists. Judgement call: the six ban settings cannot be off. Judgement call: a permanent ban's ban_expires is "permanent". Model: opus-5-5
83 lines
2.1 KiB
Go
83 lines
2.1 KiB
Go
package proxy
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import (
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"net/netip"
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"time"
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"sneak.berlin/go/smallwebwaf/internal/bans"
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"sneak.berlin/go/smallwebwaf/internal/requestlog"
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)
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// banResponse is a refusal answered with SWWAF_BAN_RESPONSE, and logged
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// with action.
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func (rq *request) banResponse(action string) *refusal {
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return &refusal{status: rq.h.config.BanResponse, action: action}
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}
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// banned reports whether a ban on the client's netblock refuses the
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// request at now, and notes for the log line when that ban ends.
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func (rq *request) banned(now time.Time) bool {
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ban, banned := rq.h.ledger.Check(rq.netblock(), now)
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if banned {
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rq.line.BanExpires = banExpires(ban)
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}
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return banned
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}
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// limitBroken counts the request for the rate limits at now, and reports
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// whether it takes the client over one. Such a request bans the client's
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// netblock, and sets the client's counters back to zero.
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func (rq *request) limitBroken(now time.Time) bool {
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group := clientGroup(rq.client)
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hit, over := rq.h.limiter.Count(group, now)
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if !over {
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return false
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}
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ban := rq.h.ledger.BanForLimit(rq.netblock(), now, bans.Notes{
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Country: rq.line.Country,
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Limit: hit.Limit,
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Window: hit.Window,
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Count: hit.Requests,
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Request: bans.Request{
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Time: now,
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Method: rq.in.Method,
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Host: rq.in.Host,
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Path: rq.in.URL.RequestURI(),
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Status: rq.h.config.BanResponse,
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UserAgent: rq.in.UserAgent(),
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},
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})
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rq.h.limiter.Reset(group)
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rq.line.LimitHit = hit.Window
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rq.line.Offence = requestlog.OffenceLimit
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rq.line.BanExpires = banExpires(ban)
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return true
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}
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// netblock is the netblock a ban on the client covers: its IPv4 address,
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// widened to SWWAF_BAN_SCOPE_V4_PREFIX, or the IPv6 group clientGroup
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// counts it in.
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func (rq *request) netblock() netip.Prefix {
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addr := rq.client.Unmap()
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if addr.Is4() {
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return netip.PrefixFrom(addr, rq.h.config.BanScopeV4Prefix).Masked()
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}
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return clientGroup(addr)
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}
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// banExpires is when ban ends, as the log line gives it: a time, or
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// permanent.
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func banExpires(ban bans.Ban) string {
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if ban.Permanent() {
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return "permanent"
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}
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return requestlog.FormatTime(ban.Expires)
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}
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