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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,113 @@ | ||
| package dnsforward | ||
|
|
||
| import ( | ||
| "encoding/binary" | ||
| "fmt" | ||
|
|
||
| "github.com/AdguardTeam/AdGuardHome/internal/aghnet" | ||
| "github.com/AdguardTeam/dnsproxy/proxy" | ||
| "github.com/AdguardTeam/golibs/errors" | ||
| "github.com/AdguardTeam/golibs/log" | ||
| "github.com/miekg/dns" | ||
| ) | ||
|
|
||
| // type check | ||
| var _ proxy.BeforeRequestHandler = (*Server)(nil) | ||
|
|
||
| // HandleBefore is the handler that is called before any other processing, | ||
| // including logs. It performs access checks and puts the client ID, if there | ||
| // is one, into the server's cache. | ||
| // | ||
| // TODO(e.burkov): Write tests. | ||
| func (s *Server) HandleBefore( | ||
| _ *proxy.Proxy, | ||
| pctx *proxy.DNSContext, | ||
| ) (err error) { | ||
| clientID, err := s.clientIDFromDNSContext(pctx) | ||
| if err != nil { | ||
| return fmt.Errorf("getting clientid: %w", err) | ||
| } | ||
|
|
||
| blocked, _ := s.IsBlockedClient(pctx.Addr.Addr(), clientID) | ||
| if blocked { | ||
| return s.preBlockedResponse(pctx) | ||
| } | ||
|
|
||
| if len(pctx.Req.Question) == 1 { | ||
| q := pctx.Req.Question[0] | ||
| qt := q.Qtype | ||
| host := aghnet.NormalizeDomain(q.Name) | ||
| if s.access.isBlockedHost(host, qt) { | ||
| log.Debug("access: request %s %s is in access blocklist", dns.Type(qt), host) | ||
|
|
||
| return s.preBlockedResponse(pctx) | ||
| } | ||
| } | ||
|
|
||
| if clientID != "" { | ||
| key := [8]byte{} | ||
| binary.BigEndian.PutUint64(key[:], pctx.RequestID) | ||
| s.clientIDCache.Set(key[:], []byte(clientID)) | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| // clientIDFromDNSContext extracts the client's ID from the server name of the | ||
| // client's DoT or DoQ request or the path of the client's DoH. If the protocol | ||
| // is not one of these, clientID is an empty string and err is nil. | ||
| func (s *Server) clientIDFromDNSContext(pctx *proxy.DNSContext) (clientID string, err error) { | ||
| proto := pctx.Proto | ||
| if proto == proxy.ProtoHTTPS { | ||
| clientID, err = clientIDFromDNSContextHTTPS(pctx) | ||
| if err != nil { | ||
| return "", fmt.Errorf("checking url: %w", err) | ||
| } else if clientID != "" { | ||
| return clientID, nil | ||
| } | ||
|
|
||
| // Go on and check the domain name as well. | ||
| } else if proto != proxy.ProtoTLS && proto != proxy.ProtoQUIC { | ||
| return "", nil | ||
| } | ||
|
|
||
| hostSrvName := s.conf.ServerName | ||
| if hostSrvName == "" { | ||
| return "", nil | ||
| } | ||
|
|
||
| cliSrvName, err := clientServerName(pctx, proto) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
|
|
||
| clientID, err = clientIDFromClientServerName( | ||
| hostSrvName, | ||
| cliSrvName, | ||
| s.conf.StrictSNICheck, | ||
| ) | ||
| if err != nil { | ||
| return "", fmt.Errorf("clientid check: %w", err) | ||
| } | ||
|
|
||
| return clientID, nil | ||
| } | ||
|
|
||
| // errAccessBlocked is a sentinel error returned when a request is blocked by | ||
| // access settings. | ||
| var errAccessBlocked errors.Error = "blocked by access settings" | ||
|
|
||
| // preBlockedResponse returns a protocol-appropriate response for a request that | ||
| // was blocked by access settings. | ||
| func (s *Server) preBlockedResponse(pctx *proxy.DNSContext) (err error) { | ||
| if pctx.Proto == proxy.ProtoUDP || pctx.Proto == proxy.ProtoDNSCrypt { | ||
| // Return nil so that dnsproxy drops the connection and thus | ||
| // prevent DNS amplification attacks. | ||
| return errAccessBlocked | ||
| } | ||
|
|
||
| return &proxy.BeforeRequestError{ | ||
| Err: errAccessBlocked, | ||
| Response: s.makeResponseREFUSED(pctx.Req), | ||
| } | ||
| } |
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