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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. By hand afterwards: the header's spelling, which the linter requires, and the padding after `waf` in `sww`'s usage text. Model: opus-5-5
63 lines
1.7 KiB
Go
63 lines
1.7 KiB
Go
package waf
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import (
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"crypto/rand"
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"net/http"
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"net/netip"
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"slices"
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)
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// peerAddress is the address of the request's TCP peer.
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func peerAddress(r *http.Request) netip.Addr {
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addrPort, err := netip.ParseAddrPort(r.RemoteAddr)
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if err != nil {
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return netip.Addr{}
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}
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return addrPort.Addr().Unmap()
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}
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// requestIDHeader carries the request's id, from rproxy.
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const requestIDHeader = "X-Request-ID"
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// requestID is the request's id: the one a question gives, or for any other
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// request a new random one.
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func requestID(r *http.Request, isQuestion bool) string {
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if isQuestion {
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return r.Header.Get(requestIDHeader)
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}
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return rand.Text()
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}
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// scheme is how the visitor reached rproxy, or the trusted proxy in front of
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// it, as a question says in X-Forwarded-Proto, or otherwise http.
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func scheme(r *http.Request, isQuestion bool) string {
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proto := r.Header.Get("X-Forwarded-Proto")
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if !isQuestion || proto == "" {
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return "http"
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}
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return proto
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}
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// clientGroup is the client a request is counted toward: its IPv4
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// address, or its IPv6 group, the netblock its IPv6 address is in of the
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// length SWW_IPV6_GROUP_PREFIX sets, a /64 by default, since one abuser
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// usually holds a whole /64. An IPv4 address in IPv6 form counts as IPv4.
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func (h *handler) clientGroup(addr netip.Addr) netip.Prefix {
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addr = addr.Unmap()
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if addr.Is6() {
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return netip.PrefixFrom(addr, h.config.IPv6GroupPrefix).Masked()
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}
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return netip.PrefixFrom(addr, addr.BitLen())
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}
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// isInside reports whether addr is in one of the netblocks.
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func isInside(addr netip.Addr, netblocks []netip.Prefix) bool {
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return slices.ContainsFunc(netblocks, func(netblock netip.Prefix) bool {
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return netblock.Contains(addr)
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})
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}
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