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Pull request: dnsforward: ddr support

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Merge in DNS/adguard-home from 4463-ddr-support-1 to master

Squashed commit of the following:

commit 74d8337a9d78e00a0b01301bbf92054fc58aff0d
Merge: 7882c56e ed449c61
Author: Dimitry Kolyshev <dkolyshev@adguard.com>
Date:   Wed Apr 27 10:32:48 2022 +0200

    Merge remote-tracking branch 'origin/master' into 4463-ddr-support-1

commit 7882c56eced204b99a0189c839f5b5ef56fcbfd8
Author: Dimitry Kolyshev <dkolyshev@adguard.com>
Date:   Tue Apr 26 13:29:16 2022 +0200

    all: docs

commit 59593cf47f8db2131fb8a4a44ec3721de8f73567
Author: Dimitry Kolyshev <dkolyshev@adguard.com>
Date:   Tue Apr 26 13:06:49 2022 +0200

    all: docs

commit 13bfe00d91b190a2538eeee642ce40abe031ecf2
Author: Dimitry Kolyshev <dkolyshev@adguard.com>
Date:   Tue Apr 26 12:58:48 2022 +0200

    all: docs

commit a663b53d211483a717a480e24e120a201dc3d9da
Merge: 53122f6a 235316e0
Author: Dimitry Kolyshev <dkolyshev@adguard.com>
Date:   Tue Apr 26 12:33:07 2022 +0200

    Merge remote-tracking branch 'origin/master' into 4463-ddr-support-1

commit 53122f6aac8e9ede69de833e367e006f4c5c75c0
Author: Dimitry Kolyshev <dkolyshev@adguard.com>
Date:   Tue Apr 26 12:30:56 2022 +0200

    dnsforward: ddr support

commit 87083ded02c120e1fb3e54b885a1992efd8f780d
Author: Dimitry Kolyshev <dkolyshev@adguard.com>
Date:   Tue Apr 26 11:51:06 2022 +0200

    dnsforward: ddr support

commit 3dc711e0a9ba1a024e7d24527b2a690aa36413ce
Author: Dimitry Kolyshev <dkolyshev@adguard.com>
Date:   Tue Apr 26 11:39:59 2022 +0200

    dnsforward: imp code

commit f63f6a9d65a96960ae2c06aeca2b32aef70d8f63
Author: Dimitry Kolyshev <dkolyshev@adguard.com>
Date:   Tue Apr 26 11:34:23 2022 +0200

    dnsforward: ddr support

commit e64ffcdac8f9428e4c93a6dc99cc3f1bb090af35
Author: Dimitry Kolyshev <dkolyshev@adguard.com>
Date:   Tue Apr 26 11:22:20 2022 +0200

    dnsforward: ddr support

commit 297460946bb1765137c7c3fe3e298cd574635287
Author: Dimitry Kolyshev <dkolyshev@adguard.com>
Date:   Tue Apr 26 11:08:59 2022 +0200

    dnsforward: imp code

commit 61b4e2e0e06e212c31b7a9d1b09fab392ae6dbc4
Author: Dimitry Kolyshev <dkolyshev@adguard.com>
Date:   Mon Apr 25 14:39:34 2022 +0200

    dnsforward: ddr support

commit 7c2787e12eb67a02b41cbb4fe36a12671259f9c9
Author: Dimitry Kolyshev <dkolyshev@adguard.com>
Date:   Mon Apr 25 11:41:42 2022 +0200

    all: docs

commit 29c2c872843f6d006e6a98144a52e23a4cbe7be9
Author: Dimitry Kolyshev <dkolyshev@adguard.com>
Date:   Mon Apr 25 11:26:07 2022 +0200

    dnsforward: ddr support

commit 2d4ba0c4ce4fbbf3d99da8dd92349da2ec9cff13
Author: Dimitry Kolyshev <dkolyshev@adguard.com>
Date:   Mon Apr 25 11:03:34 2022 +0200

    dnsforward: ddr support

commit 0efb5b5cd55bcba3dfae35e80209277f0643a87e
Author: Dimitry Kolyshev <dkolyshev@adguard.com>
Date:   Sun Apr 24 13:07:25 2022 +0200

    dnsforward: imp code

commit 884381ef04029d5d743834555cb6601d891c2d25
Author: Dimitry Kolyshev <dkolyshev@adguard.com>
Date:   Sun Apr 24 12:56:41 2022 +0200

    dnsforward: imp code

commit 41231f24e83a9690d36546e83fd61ddd709050ed
Author: Dimitry Kolyshev <dkolyshev@adguard.com>
Date:   Fri Apr 22 16:05:47 2022 +0200

    dnsforward: ddr support

commit 9d9da3f479efa5d5609f9b1e6b0d1a93fc253b9f
Author: Dimitry Kolyshev <dkolyshev@adguard.com>
Date:   Fri Apr 22 13:46:29 2022 +0200

    all: ddr support

commit b225363df143d599e9acbf1a6b0bf6d00044dd47
Author: Dimitry Kolyshev <dkolyshev@adguard.com>
Date:   Fri Apr 22 13:38:27 2022 +0200

    dnsforward: imp code

... and 10 more commits
This commit is contained in:
Dimitry Kolyshev 2022-04-27 11:39:48 +03:00
parent ed449c6186
commit c4ff80fd3a
5 changed files with 229 additions and 2 deletions
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5
CHANGELOG.md
View file

@ -23,6 +23,8 @@ and this project adheres to
### Added
- Support for Discovery of Designated Resolvers (DDR) according to the
[RFC draft][ddr-draft-06] ([#4463]).
- The ability to control each source of runtime clients separately via
`clients.runtime_sources` configuration object ([#3020]).
- The ability to customize the set of networks that are considered private
@ -143,8 +145,9 @@ In this release, the schema version has changed from 12 to 14.
[#4276]: https://github.com/AdguardTeam/AdGuardHome/issues/4276
[#4499]: https://github.com/AdguardTeam/AdGuardHome/issues/4499
[repr]: https://reproducible-builds.org/docs/source-date-epoch/
[ddr-draft-06]: https://www.ietf.org/archive/id/draft-ietf-add-ddr-06.html
[doq-draft-10]: https://datatracker.ietf.org/doc/html/draft-ietf-dprive-dnsoquic-10#section-10.2
[repr]: https://reproducible-builds.org/docs/source-date-epoch/

3
internal/dnsforward/config.go
View file

@ -122,6 +122,7 @@ type FilteringConfig struct {
EnableDNSSEC bool `yaml:"enable_dnssec"` // Set AD flag in outcoming DNS request
EnableEDNSClientSubnet bool `yaml:"edns_client_subnet"` // Enable EDNS Client Subnet option
MaxGoroutines uint32 `yaml:"max_goroutines"` // Max. number of parallel goroutines for processing incoming requests
HandleDDR bool `yaml:"handle_ddr"` // Handle DDR requests
// IpsetList is the ipset configuration that allows AdGuard Home to add
// IP addresses of the specified domain names to an ipset list. Syntax:
@ -151,7 +152,7 @@ type TLSConfig struct {
PrivateKeyData []byte `yaml:"-" json:"-"`
// ServerName is the hostname of the server. Currently, it is only being
// used for ClientID checking.
// used for ClientID checking and Discovery of Designated Resolvers (DDR).
ServerName string `yaml:"-" json:"-"`
cert tls.Certificate

76
internal/dnsforward/dns.go
View file

@ -76,6 +76,10 @@ const (
resultCodeError
)
// ddrHostFQDN is the FQDN used in Discovery of Designated Resolvers (DDR) requests.
// See https://www.ietf.org/archive/id/draft-ietf-add-ddr-06.html.
const ddrHostFQDN = "_dns.resolver.arpa."
// 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{
@ -94,6 +98,7 @@ func (s *Server) handleDNSRequest(_ *proxy.Proxy, d *proxy.DNSContext) error {
mods := []modProcessFunc{
s.processRecursion,
s.processInitial,
s.processDDRQuery,
s.processDetermineLocal,
s.processInternalHosts,
s.processRestrictLocal,
@ -241,6 +246,77 @@ func (s *Server) onDHCPLeaseChanged(flags int) {
s.setTableIPToHost(ipToHost)
}
// processDDRQuery responds to SVCB query for a special use domain name
// ‘_dns.resolver.arpa’. The result contains different types of encryption
// supported by current user configuration.
//
// See https://www.ietf.org/archive/id/draft-ietf-add-ddr-06.html.
func (s *Server) processDDRQuery(ctx *dnsContext) (rc resultCode) {
d := ctx.proxyCtx
question := d.Req.Question[0]
if !s.conf.HandleDDR {
return resultCodeSuccess
}
if question.Name == ddrHostFQDN {
// TODO(a.garipov): Check DoQ support in next RFC drafts.
if s.dnsProxy.TLSListenAddr == nil && s.dnsProxy.HTTPSListenAddr == nil ||
question.Qtype != dns.TypeSVCB {
d.Res = s.makeResponse(d.Req)
return resultCodeFinish
}
d.Res = s.makeDDRResponse(d.Req)
return resultCodeFinish
}
return resultCodeSuccess
}
// makeDDRResponse creates DDR answer according to server configuration.
func (s *Server) makeDDRResponse(req *dns.Msg) (resp *dns.Msg) {
resp = s.makeResponse(req)
domainName := s.conf.ServerName
for _, addr := range s.dnsProxy.HTTPSListenAddr {
values := []dns.SVCBKeyValue{
&dns.SVCBAlpn{Alpn: []string{"h2"}},
&dns.SVCBPort{Port: uint16(addr.Port)},
&dns.SVCBDoHPath{Template: "/dns-query?dns"},
}
ans := &dns.SVCB{
Hdr: s.hdr(req, dns.TypeSVCB),
Priority: 1,
Target: domainName,
Value: values,
}
resp.Answer = append(resp.Answer, ans)
}
for _, addr := range s.dnsProxy.TLSListenAddr {
values := []dns.SVCBKeyValue{
&dns.SVCBAlpn{Alpn: []string{"dot"}},
&dns.SVCBPort{Port: uint16(addr.Port)},
}
ans := &dns.SVCB{
Hdr: s.hdr(req, dns.TypeSVCB),
Priority: 2,
Target: domainName,
Value: values,
}
resp.Answer = append(resp.Answer, ans)
}
return resp
}
// processDetermineLocal determines if the client's IP address is from
// locally-served network and saves the result into the context.
func (s *Server) processDetermineLocal(dctx *dnsContext) (rc resultCode) {

146
internal/dnsforward/dns_test.go
View file

@ -14,6 +14,152 @@ import (
"github.com/stretchr/testify/require"
)
const ddrTestDomainName = "dns.example.net"
func TestServer_ProcessDDRQuery(t *testing.T) {
dohSVCB := &dns.SVCB{
Priority: 1,
Target: ddrTestDomainName,
Value: []dns.SVCBKeyValue{
&dns.SVCBAlpn{Alpn: []string{"h2"}},
&dns.SVCBPort{Port: 8044},
&dns.SVCBDoHPath{Template: "/dns-query?dns"},
},
}
dotSVCB := &dns.SVCB{
Priority: 2,
Target: ddrTestDomainName,
Value: []dns.SVCBKeyValue{
&dns.SVCBAlpn{Alpn: []string{"dot"}},
&dns.SVCBPort{Port: 8043},
},
}
testCases := []struct {
name string
host string
want []*dns.SVCB
wantRes resultCode
portDoH int
portDoT int
qtype uint16
ddrEnabled bool
}{{
name: "pass_host",
wantRes: resultCodeSuccess,
host: "example.net.",
qtype: dns.TypeSVCB,
ddrEnabled: true,
portDoH: 8043,
}, {
name: "pass_qtype",
wantRes: resultCodeFinish,
host: ddrHostFQDN,
qtype: dns.TypeA,
ddrEnabled: true,
portDoH: 8043,
}, {
name: "pass_disabled_tls",
wantRes: resultCodeFinish,
host: ddrHostFQDN,
qtype: dns.TypeSVCB,
ddrEnabled: true,
}, {
name: "pass_disabled_ddr",
wantRes: resultCodeSuccess,
host: ddrHostFQDN,
qtype: dns.TypeSVCB,
ddrEnabled: false,
portDoH: 8043,
}, {
name: "dot",
wantRes: resultCodeFinish,
want: []*dns.SVCB{dotSVCB},
host: ddrHostFQDN,
qtype: dns.TypeSVCB,
ddrEnabled: true,
portDoT: 8043,
}, {
name: "doh",
wantRes: resultCodeFinish,
want: []*dns.SVCB{dohSVCB},
host: ddrHostFQDN,
qtype: dns.TypeSVCB,
ddrEnabled: true,
portDoH: 8044,
}, {
name: "dot_doh",
wantRes: resultCodeFinish,
want: []*dns.SVCB{dotSVCB, dohSVCB},
host: ddrHostFQDN,
qtype: dns.TypeSVCB,
ddrEnabled: true,
portDoT: 8043,
portDoH: 8044,
}}
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
s := prepareTestServer(t, tc.portDoH, tc.portDoT, tc.ddrEnabled)
req := createTestMessageWithType(tc.host, tc.qtype)
dctx := &dnsContext{
proxyCtx: &proxy.DNSContext{
Req: req,
},
}
res := s.processDDRQuery(dctx)
require.Equal(t, tc.wantRes, res)
if tc.wantRes != resultCodeFinish {
return
}
msg := dctx.proxyCtx.Res
require.NotNil(t, msg)
for _, v := range tc.want {
v.Hdr = s.hdr(req, dns.TypeSVCB)
}
assert.ElementsMatch(t, tc.want, msg.Answer)
})
}
}
func prepareTestServer(t *testing.T, portDoH, portDoT int, ddrEnabled bool) (s *Server) {
t.Helper()
proxyConf := proxy.Config{}
if portDoH > 0 {
proxyConf.HTTPSListenAddr = []*net.TCPAddr{{Port: portDoH}}
}
if portDoT > 0 {
proxyConf.TLSListenAddr = []*net.TCPAddr{{Port: portDoT}}
}
s = &Server{
dnsProxy: &proxy.Proxy{
Config: proxyConf,
},
conf: ServerConfig{
FilteringConfig: FilteringConfig{
HandleDDR: ddrEnabled,
},
TLSConfig: TLSConfig{
ServerName: ddrTestDomainName,
},
},
}
return s
}
func TestServer_ProcessDetermineLocal(t *testing.T) {
s := &Server{
privateNets: netutil.SubnetSetFunc(netutil.IsLocallyServed),

1
internal/home/config.go
View file

@ -187,6 +187,7 @@ var config = &configuration{
Ratelimit: 20,
RefuseAny: true,
AllServers: false,
HandleDDR: true,
FastestTimeout: timeutil.Duration{
Duration: fastip.DefaultPingWaitTimeout,
},