mirror of
https://github.com/AdguardTeam/AdGuardHome.git
synced 2024-09-11 10:45:42 +03:00
Pull request: 3842 ptr filtering
Merge in DNS/adguard-home from 3842-fix-ptr-restrict to master Updates #3842. Squashed commit of the following: commit 77bbec41c5238f8fcb0d2bb8d11910d1ac521fcd Author: Eugene Burkov <E.Burkov@AdGuard.COM> Date: Mon Nov 15 17:34:14 2021 +0300 dnsforward: imp docs commit c637276b5a53f5301387b7dc3035e265d0bc9418 Author: Eugene Burkov <E.Burkov@AdGuard.COM> Date: Mon Nov 15 15:41:39 2021 +0300 dnsforward: fix local ptr blocking
This commit is contained in:
parent
4f257a1cfc
commit
9c8e087544
@ -16,9 +16,6 @@ import (
|
||||
|
||||
// To transfer information between modules
|
||||
type dnsContext struct {
|
||||
// TODO(a.garipov): Remove this and rewrite processors to be methods of
|
||||
// *Server instead.
|
||||
srv *Server
|
||||
proxyCtx *proxy.DNSContext
|
||||
// setts are the filtering settings for the client.
|
||||
setts *filtering.Settings
|
||||
@ -28,7 +25,8 @@ type dnsContext struct {
|
||||
// response is modified by filters.
|
||||
origResp *dns.Msg
|
||||
// unreversedReqIP stores an IP address obtained from PTR request if it
|
||||
// was successfully parsed.
|
||||
// parsed successfully and belongs to one of locally-served IP ranges as per
|
||||
// RFC 6303.
|
||||
unreversedReqIP net.IP
|
||||
// err is the error returned from a processing function.
|
||||
err error
|
||||
@ -69,7 +67,6 @@ const (
|
||||
// handleDNSRequest filters the incoming DNS requests and writes them to the query log
|
||||
func (s *Server) handleDNSRequest(_ *proxy.Proxy, d *proxy.DNSContext) error {
|
||||
ctx := &dnsContext{
|
||||
srv: s,
|
||||
proxyCtx: d,
|
||||
result: &filtering.Result{},
|
||||
startTime: time.Now(),
|
||||
@ -84,7 +81,7 @@ func (s *Server) handleDNSRequest(_ *proxy.Proxy, d *proxy.DNSContext) error {
|
||||
// appropriate handler.
|
||||
mods := []modProcessFunc{
|
||||
s.processRecursion,
|
||||
processInitial,
|
||||
s.processInitial,
|
||||
s.processDetermineLocal,
|
||||
s.processInternalHosts,
|
||||
s.processRestrictLocal,
|
||||
@ -93,10 +90,10 @@ func (s *Server) handleDNSRequest(_ *proxy.Proxy, d *proxy.DNSContext) error {
|
||||
s.processFilteringBeforeRequest,
|
||||
s.processLocalPTR,
|
||||
s.processUpstream,
|
||||
processDNSSECAfterResponse,
|
||||
processFilteringAfterResponse,
|
||||
s.processDNSSECAfterResponse,
|
||||
s.processFilteringAfterResponse,
|
||||
s.ipset.process,
|
||||
processQueryLogsAndStats,
|
||||
s.processQueryLogsAndStats,
|
||||
}
|
||||
for _, process := range mods {
|
||||
r := process(ctx)
|
||||
@ -135,8 +132,7 @@ func (s *Server) processRecursion(dctx *dnsContext) (rc resultCode) {
|
||||
}
|
||||
|
||||
// Perform initial checks; process WHOIS & rDNS
|
||||
func processInitial(ctx *dnsContext) (rc resultCode) {
|
||||
s := ctx.srv
|
||||
func (s *Server) processInitial(ctx *dnsContext) (rc resultCode) {
|
||||
d := ctx.proxyCtx
|
||||
if s.conf.AAAADisabled && d.Req.Question[0].Qtype == dns.TypeAAAA {
|
||||
_ = proxy.CheckDisabledAAAARequest(d, true)
|
||||
@ -155,6 +151,9 @@ func processInitial(ctx *dnsContext) (rc resultCode) {
|
||||
return resultCodeFinish
|
||||
}
|
||||
|
||||
ctx.protectionEnabled = s.conf.ProtectionEnabled
|
||||
ctx.setts = s.getClientRequestFilteringSettings(ctx)
|
||||
|
||||
return resultCodeSuccess
|
||||
}
|
||||
|
||||
@ -339,10 +338,16 @@ func (s *Server) processRestrictLocal(ctx *dnsContext) (rc resultCode) {
|
||||
}
|
||||
|
||||
// Restrict an access to local addresses for external clients. We also
|
||||
// assume that all the DHCP leases we give are locally-served or at
|
||||
// least don't need to be inaccessible externally.
|
||||
if s.subnetDetector.IsLocallyServedNetwork(ip) && !ctx.isLocalClient {
|
||||
log.Debug("dns: %q requests for internal ip", d.Addr)
|
||||
// assume that all the DHCP leases we give are locally-served or at least
|
||||
// don't need to be inaccessible externally.
|
||||
if !s.subnetDetector.IsLocallyServedNetwork(ip) {
|
||||
log.Debug("dns: addr %s is not from locally-served network", ip)
|
||||
|
||||
return resultCodeSuccess
|
||||
}
|
||||
|
||||
if !ctx.isLocalClient {
|
||||
log.Debug("dns: %q requests an internal ip", d.Addr)
|
||||
d.Res = s.genNXDomain(req)
|
||||
|
||||
// Do not even put into query log.
|
||||
@ -352,13 +357,13 @@ func (s *Server) processRestrictLocal(ctx *dnsContext) (rc resultCode) {
|
||||
// Do not perform unreversing ever again.
|
||||
ctx.unreversedReqIP = ip
|
||||
|
||||
// Disable redundant filtering.
|
||||
filterSetts := s.getClientRequestFilteringSettings(ctx)
|
||||
filterSetts.ParentalEnabled = false
|
||||
filterSetts.SafeBrowsingEnabled = false
|
||||
filterSetts.SafeSearchEnabled = false
|
||||
filterSetts.ServicesRules = nil
|
||||
ctx.setts = filterSetts
|
||||
// There is no need to filter request from external addresses since this
|
||||
// code is only executed when the request is for locally-served ARPA
|
||||
// hostname so disable redundant filters.
|
||||
ctx.setts.ParentalEnabled = false
|
||||
ctx.setts.SafeBrowsingEnabled = false
|
||||
ctx.setts.SafeSearchEnabled = false
|
||||
ctx.setts.ServicesRules = nil
|
||||
|
||||
// Nothing to restrict.
|
||||
return resultCodeSuccess
|
||||
@ -475,16 +480,10 @@ func (s *Server) processFilteringBeforeRequest(ctx *dnsContext) (rc resultCode)
|
||||
s.serverLock.RLock()
|
||||
defer s.serverLock.RUnlock()
|
||||
|
||||
ctx.protectionEnabled = s.conf.ProtectionEnabled
|
||||
|
||||
if s.dnsFilter == nil {
|
||||
return resultCodeSuccess
|
||||
}
|
||||
|
||||
if ctx.setts == nil {
|
||||
ctx.setts = s.getClientRequestFilteringSettings(ctx)
|
||||
}
|
||||
|
||||
var err error
|
||||
if ctx.result, err = s.filterDNSRequest(ctx); err != nil {
|
||||
ctx.err = err
|
||||
@ -555,11 +554,11 @@ func (s *Server) processUpstream(ctx *dnsContext) (rc resultCode) {
|
||||
}
|
||||
|
||||
// Process DNSSEC after response from upstream server
|
||||
func processDNSSECAfterResponse(ctx *dnsContext) (rc resultCode) {
|
||||
func (s *Server) processDNSSECAfterResponse(ctx *dnsContext) (rc resultCode) {
|
||||
d := ctx.proxyCtx
|
||||
|
||||
if !ctx.responseFromUpstream || // don't process response if it's not from upstream servers
|
||||
!ctx.srv.conf.EnableDNSSEC {
|
||||
// Don't process response if it's not from upstream servers.
|
||||
if !ctx.responseFromUpstream || !s.conf.EnableDNSSEC {
|
||||
return resultCodeSuccess
|
||||
}
|
||||
|
||||
@ -601,8 +600,7 @@ func processDNSSECAfterResponse(ctx *dnsContext) (rc resultCode) {
|
||||
}
|
||||
|
||||
// Apply filtering logic after we have received response from upstream servers
|
||||
func processFilteringAfterResponse(ctx *dnsContext) (rc resultCode) {
|
||||
s := ctx.srv
|
||||
func (s *Server) processFilteringAfterResponse(ctx *dnsContext) (rc resultCode) {
|
||||
d := ctx.proxyCtx
|
||||
|
||||
switch res := ctx.result; res.Reason {
|
||||
|
@ -13,9 +13,8 @@ import (
|
||||
)
|
||||
|
||||
// Write Stats data and logs
|
||||
func processQueryLogsAndStats(ctx *dnsContext) (rc resultCode) {
|
||||
func (s *Server) processQueryLogsAndStats(ctx *dnsContext) (rc resultCode) {
|
||||
elapsed := time.Since(ctx.startTime)
|
||||
s := ctx.srv
|
||||
pctx := ctx.proxyCtx
|
||||
|
||||
shouldLog := true
|
||||
|
@ -160,6 +160,12 @@ func TestProcessQueryLogsAndStats(t *testing.T) {
|
||||
require.NoError(t, err)
|
||||
|
||||
for _, tc := range testCases {
|
||||
ql := &testQueryLog{}
|
||||
st := &testStats{}
|
||||
srv := &Server{
|
||||
queryLog: ql,
|
||||
stats: st,
|
||||
}
|
||||
t.Run(tc.name, func(t *testing.T) {
|
||||
req := &dns.Msg{
|
||||
Question: []dns.Question{{
|
||||
@ -173,14 +179,7 @@ func TestProcessQueryLogsAndStats(t *testing.T) {
|
||||
Addr: tc.addr,
|
||||
Upstream: ups,
|
||||
}
|
||||
|
||||
ql := &testQueryLog{}
|
||||
st := &testStats{}
|
||||
dctx := &dnsContext{
|
||||
srv: &Server{
|
||||
queryLog: ql,
|
||||
stats: st,
|
||||
},
|
||||
proxyCtx: pctx,
|
||||
startTime: time.Now(),
|
||||
result: &filtering.Result{
|
||||
@ -189,7 +188,7 @@ func TestProcessQueryLogsAndStats(t *testing.T) {
|
||||
clientID: tc.clientID,
|
||||
}
|
||||
|
||||
code := processQueryLogsAndStats(dctx)
|
||||
code := srv.processQueryLogsAndStats(dctx)
|
||||
assert.Equal(t, tc.wantCode, code)
|
||||
assert.Equal(t, tc.wantLogProto, ql.lastParams.ClientProto)
|
||||
assert.Equal(t, tc.wantStatClient, st.lastEntry.Client)
|
||||
|
Loading…
Reference in New Issue
Block a user