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Pull request 2076: 1660-disable-plain

Browse source 
Updates #1660.

Squashed commit of the following:

commit d928a00b7c77a33717fe3e77aace1f1b41a960d2
Merge: 38e401d78 0f5e8ca56
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Wed Nov 22 13:39:34 2023 +0300

    Merge branch 'master' into 1660-disable-plain

commit 38e401d7827ce1ea190b5328cadb3bb0ff5a5cba
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Tue Nov 21 20:17:53 2023 +0300

    dnsforward: imp validation

commit f9e99cec209078128fef1b147294c7abe3f6ae70
Merge: cb7529682 c8f1112d4
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Mon Nov 20 16:02:31 2023 +0300

    Merge branch 'master' into 1660-disable-plain

commit cb75296821cae594e8c4d17dfdd8be2190aee7f7
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Fri Nov 17 14:20:02 2023 +0300

    all: add serve_plain_dns
This commit is contained in:
Ainar Garipov 2023-11-22 13:49:02 +03:00
parent 0f5e8ca56f
commit 73358263e8
12 changed files with 94 additions and 21 deletions
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5
CHANGELOG.md
View file

@ -25,10 +25,14 @@ NOTE: Add new changes BELOW THIS COMMENT.
### Added
- Ability to disable plain-DNS serving through configuration file if an
encrypted protocol is already used ([#1660]).
- Ability to specify rate limiting settings in the Web UI ([#6369]).
#### Configuration changes
- The new property `dns.serve_plain_dns` has been added to the configuration
file ([#1660]).
- The property `dns.bogus_nxdomain` is now validated more strictly.
- Added new properties `clients.persistent.*.upstreams_cache_enabled` and
`clients.persistent.*.upstreams_cache_size` that describe cache configuration
@ -40,6 +44,7 @@ NOTE: Add new changes BELOW THIS COMMENT.
- Pre-filling the New static lease window with data ([#6402]).
- Protection pause timer synchronization ([#5759]).
[#1660]: https://github.com/AdguardTeam/AdGuardHome/issues/1660
[#5759]: https://github.com/AdguardTeam/AdGuardHome/issues/5759
[#6369]: https://github.com/AdguardTeam/AdGuardHome/issues/6369
[#6402]: https://github.com/AdguardTeam/AdGuardHome/issues/6402

51
internal/dnsforward/config.go
View file

@ -289,14 +289,15 @@ type ServerConfig struct {
// UseHTTP3Upstreams defines if HTTP/3 is be allowed for DNS-over-HTTPS
// upstreams.
UseHTTP3Upstreams bool
// ServePlainDNS defines if plain DNS is allowed for incoming requests.
ServePlainDNS bool
}
// createProxyConfig creates and validates configuration for the main proxy.
func (s *Server) createProxyConfig() (conf proxy.Config, err error) {
// newProxyConfig creates and validates configuration for the main proxy.
func (s *Server) newProxyConfig() (conf *proxy.Config, err error) {
srvConf := s.conf
conf = proxy.Config{
UDPListenAddr: srvConf.UDPListenAddrs,
TCPListenAddr: srvConf.TCPListenAddrs,
conf = &proxy.Config{
HTTP3: srvConf.ServeHTTP3,
Ratelimit: int(srvConf.Ratelimit),
RatelimitSubnetMaskIPv4: net.CIDRMask(srvConf.RatelimitSubnetLenIPv4, netutil.IPv4BitLen),
@ -328,7 +329,7 @@ func (s *Server) createProxyConfig() (conf proxy.Config, err error) {
}
setProxyUpstreamMode(
&conf,
conf,
srvConf.AllServers,
srvConf.FastestAddr,
srvConf.FastestTimeout.Duration,
@ -336,12 +337,17 @@ func (s *Server) createProxyConfig() (conf proxy.Config, err error) {
conf.BogusNXDomain, err = parseBogusNXDOMAIN(srvConf.BogusNXDomain)
if err != nil {
return proxy.Config{}, fmt.Errorf("bogus_nxdomain: %w", err)
return nil, fmt.Errorf("bogus_nxdomain: %w", err)
}
err = s.prepareTLS(&conf)
err = s.prepareTLS(conf)
if err != nil {
return proxy.Config{}, fmt.Errorf("validating tls: %w", err)
return nil, fmt.Errorf("validating tls: %w", err)
}
err = s.preparePlain(conf)
if err != nil {
return nil, fmt.Errorf("validating plain: %w", err)
}
if c := srvConf.DNSCryptConfig; c.Enabled {
@ -352,7 +358,7 @@ func (s *Server) createProxyConfig() (conf proxy.Config, err error) {
}
if conf.UpstreamConfig == nil || len(conf.UpstreamConfig.Upstreams) == 0 {
return proxy.Config{}, errors.Error("no default upstream servers configured")
return nil, errors.Error("no default upstream servers configured")
}
return conf, nil
@ -664,6 +670,31 @@ func (s *Server) onGetCertificate(ch *tls.ClientHelloInfo) (*tls.Certificate, er
return &s.conf.cert, nil
}
// preparePlain prepares the plain-DNS configuration for the DNS proxy.
// preparePlain assumes that prepareTLS has already been called.
func (s *Server) preparePlain(proxyConf *proxy.Config) (err error) {
if s.conf.ServePlainDNS {
proxyConf.UDPListenAddr = s.conf.UDPListenAddrs
proxyConf.TCPListenAddr = s.conf.TCPListenAddrs
return nil
}
lenEncrypted := len(proxyConf.DNSCryptTCPListenAddr) +
len(proxyConf.DNSCryptUDPListenAddr) +
len(proxyConf.HTTPSListenAddr) +
len(proxyConf.QUICListenAddr) +
len(proxyConf.TLSListenAddr)
if lenEncrypted == 0 {
// TODO(a.garipov): Support full disabling of all DNS.
return errors.Error("disabling plain dns requires at least one encrypted protocol")
}
log.Info("dnsforward: warning: plain dns is disabled")
return nil
}
// UpdatedProtectionStatus updates protection state, if the protection was
// disabled temporarily. Returns the updated state of protection.
func (s *Server) UpdatedProtectionStatus() (enabled bool, disabledUntil *time.Time) {

1
internal/dnsforward/dns64_test.go
View file

@ -292,6 +292,7 @@ func TestServer_HandleDNSRequest_dns64(t *testing.T) {
Config: Config{
EDNSClientSubnet: &EDNSClientSubnet{Enabled: false},
},
ServePlainDNS: true,
}, localUps)
t.Run(tc.name, func(t *testing.T) {

13
internal/dnsforward/dnsforward.go
View file

@ -109,7 +109,7 @@ type Server struct {
// stats is the statistics collector for client's DNS usage data.
stats stats.Interface
// access drops unallowed clients.
// access drops disallowed clients.
access *accessManager
// localDomainSuffix is the suffix used to detect internal hosts. It
@ -232,8 +232,10 @@ func NewServer(p DNSCreateParams) (s *Server, err error) {
if p.Anonymizer == nil {
p.Anonymizer = aghnet.NewIPMut(nil)
}
s = &Server{
dnsFilter: p.DNSFilter,
dhcpServer: p.DHCPServer,
stats: p.Stats,
queryLog: p.QueryLog,
privateNets: p.PrivateNets,
@ -246,6 +248,9 @@ func NewServer(p DNSCreateParams) (s *Server, err error) {
MaxCount: defaultClientIDCacheCount,
}),
anonymizer: p.Anonymizer,
conf: ServerConfig{
ServePlainDNS: true,
},
}
s.sysResolvers, err = sysresolv.NewSystemResolvers(nil, defaultPlainDNSPort)
@ -253,8 +258,6 @@ func NewServer(p DNSCreateParams) (s *Server, err error) {
return nil, fmt.Errorf("initializing system resolvers: %w", err)
}
s.dhcpServer = p.DHCPServer
if runtime.GOARCH == "mips" || runtime.GOARCH == "mipsle" {
// Use plain DNS on MIPS, encryption is too slow
defaultDNS = defaultBootstrap
@ -540,7 +543,7 @@ func (s *Server) Prepare(conf *ServerConfig) (err error) {
return err
}
proxyConfig, err := s.createProxyConfig()
proxyConfig, err := s.newProxyConfig()
if err != nil {
return fmt.Errorf("preparing proxy: %w", err)
}
@ -559,7 +562,7 @@ func (s *Server) Prepare(conf *ServerConfig) (err error) {
// Set the proxy here because [setupLocalResolvers] sets its values.
//
// TODO(e.burkov): Remove once the local resolvers logic moved to dnsproxy.
s.dnsProxy = &proxy.Proxy{Config: proxyConfig}
s.dnsProxy = &proxy.Proxy{Config: *proxyConfig}
err = s.setupLocalResolvers(boot)
if err != nil {

18
internal/dnsforward/dnsforward_test.go
View file

@ -182,6 +182,7 @@ func createTestTLS(t *testing.T, tlsConf TLSConfig) (s *Server, certPem []byte)
Config: Config{
EDNSClientSubnet: &EDNSClientSubnet{Enabled: false},
},
ServePlainDNS: true,
}, nil)
tlsConf.CertificateChainData, tlsConf.PrivateKeyData = certPem, keyPem
@ -309,6 +310,7 @@ func TestServer(t *testing.T) {
Config: Config{
EDNSClientSubnet: &EDNSClientSubnet{Enabled: false},
},
ServePlainDNS: true,
}, nil)
s.conf.UpstreamConfig.Upstreams = []upstream.Upstream{newGoogleUpstream()}
startDeferStop(t, s)
@ -347,6 +349,7 @@ func TestServer_timeout(t *testing.T) {
Config: Config{
EDNSClientSubnet: &EDNSClientSubnet{Enabled: false},
},
ServePlainDNS: true,
}
s, err := NewServer(DNSCreateParams{DNSFilter: createTestDNSFilter(t)})
@ -381,6 +384,7 @@ func TestServer_Prepare_fallbacks(t *testing.T) {
},
EDNSClientSubnet: &EDNSClientSubnet{Enabled: false},
},
ServePlainDNS: true,
}
s, err := NewServer(DNSCreateParams{})
@ -402,6 +406,7 @@ func TestServerWithProtectionDisabled(t *testing.T) {
Config: Config{
EDNSClientSubnet: &EDNSClientSubnet{Enabled: false},
},
ServePlainDNS: true,
}, nil)
s.conf.UpstreamConfig.Upstreams = []upstream.Upstream{newGoogleUpstream()}
startDeferStop(t, s)
@ -479,6 +484,7 @@ func TestServerRace(t *testing.T) {
UpstreamDNS: []string{"8.8.8.8:53", "8.8.4.4:53"},
},
ConfigModified: func() {},
ServePlainDNS: true,
}
s := createTestServer(t, filterConf, forwardConf, nil)
s.conf.UpstreamConfig.Upstreams = []upstream.Upstream{newGoogleUpstream()}
@ -532,6 +538,7 @@ func TestSafeSearch(t *testing.T) {
Enabled: false,
},
},
ServePlainDNS: true,
}
s := createTestServer(t, filterConf, forwardConf, nil)
startDeferStop(t, s)
@ -594,6 +601,7 @@ func TestInvalidRequest(t *testing.T) {
Enabled: false,
},
},
ServePlainDNS: true,
}, nil)
startDeferStop(t, s)
@ -622,6 +630,7 @@ func TestBlockedRequest(t *testing.T) {
Enabled: false,
},
},
ServePlainDNS: true,
}
s := createTestServer(t, &filtering.Config{
ProtectionEnabled: true,
@ -657,6 +666,7 @@ func TestServerCustomClientUpstream(t *testing.T) {
Enabled: false,
},
},
ServePlainDNS: true,
}
s := createTestServer(t, &filtering.Config{
BlockingMode: filtering.BlockingModeDefault,
@ -733,6 +743,7 @@ func TestBlockCNAMEProtectionEnabled(t *testing.T) {
Enabled: false,
},
},
ServePlainDNS: true,
}, nil)
testUpstm := &aghtest.Upstream{
CName: testCNAMEs,
@ -765,6 +776,7 @@ func TestBlockCNAME(t *testing.T) {
Enabled: false,
},
},
ServePlainDNS: true,
}
s := createTestServer(t, &filtering.Config{
ProtectionEnabled: true,
@ -839,6 +851,7 @@ func TestClientRulesForCNAMEMatching(t *testing.T) {
Enabled: false,
},
},
ServePlainDNS: true,
}
s := createTestServer(t, &filtering.Config{
BlockingMode: filtering.BlockingModeDefault,
@ -883,6 +896,7 @@ func TestNullBlockedRequest(t *testing.T) {
Enabled: false,
},
},
ServePlainDNS: true,
}
s := createTestServer(t, &filtering.Config{
ProtectionEnabled: true,
@ -948,6 +962,7 @@ func TestBlockedCustomIP(t *testing.T) {
Enabled: false,
},
},
ServePlainDNS: true,
}
// Invalid BlockingIPv4.
@ -999,6 +1014,7 @@ func TestBlockedByHosts(t *testing.T) {
Enabled: false,
},
},
ServePlainDNS: true,
}
s := createTestServer(t, &filtering.Config{
@ -1049,6 +1065,7 @@ func TestBlockedBySafeBrowsing(t *testing.T) {
Enabled: false,
},
},
ServePlainDNS: true,
}
s := createTestServer(t, filterConf, forwardConf, nil)
startDeferStop(t, s)
@ -1107,6 +1124,7 @@ func TestRewrite(t *testing.T) {
Enabled: false,
},
},
ServePlainDNS: true,
}))
ups := aghtest.NewUpstreamMock(func(req *dns.Msg) (resp *dns.Msg, err error) {

1
internal/dnsforward/dnsrewrite_test.go
View file

@ -40,6 +40,7 @@ func TestServer_FilterDNSRewrite(t *testing.T) {
Config: Config{
EDNSClientSubnet: &EDNSClientSubnet{Enabled: false},
},
ServePlainDNS: true,
}, nil)
makeQ := func(qtype rules.RRType) (req *dns.Msg) {

1
internal/dnsforward/filter_test.go
View file

@ -35,6 +35,7 @@ func TestHandleDNSRequest_handleDNSRequest(t *testing.T) {
Enabled: false,
},
},
ServePlainDNS: true,
}
filters := []filtering.Filter{{
ID: 0, Data: []byte(rules),

3
internal/dnsforward/http_test.go
View file

@ -79,6 +79,7 @@ func TestDNSForwardHTTP_handleGetConfig(t *testing.T) {
EDNSClientSubnet: &EDNSClientSubnet{Enabled: false},
},
ConfigModified: func() {},
ServePlainDNS: true,
}
s := createTestServer(t, filterConf, forwardConf, nil)
s.sysResolvers = &emptySysResolvers{}
@ -158,6 +159,7 @@ func TestDNSForwardHTTP_handleSetConfig(t *testing.T) {
EDNSClientSubnet: &EDNSClientSubnet{Enabled: false},
},
ConfigModified: func() {},
ServePlainDNS: true,
}
s := createTestServer(t, filterConf, forwardConf, nil)
s.sysResolvers = &emptySysResolvers{}
@ -533,6 +535,7 @@ func TestServer_HandleTestUpstreamDNS(t *testing.T) {
Config: Config{
EDNSClientSubnet: &EDNSClientSubnet{Enabled: false},
},
ServePlainDNS: true,
}, nil)
srv.etcHosts = hc
startDeferStop(t, srv)

5
internal/dnsforward/process_internal_test.go
View file

@ -81,6 +81,7 @@ func TestServer_ProcessInitial(t *testing.T) {
AAAADisabled: tc.aaaaDisabled,
EDNSClientSubnet: &EDNSClientSubnet{Enabled: false},
},
ServePlainDNS: true,
}
s := createTestServer(t, &filtering.Config{
@ -180,6 +181,7 @@ func TestServer_ProcessFilteringAfterResponse(t *testing.T) {
AAAADisabled: tc.aaaaDisabled,
EDNSClientSubnet: &EDNSClientSubnet{Enabled: false},
},
ServePlainDNS: true,
}
s := createTestServer(t, &filtering.Config{
@ -369,6 +371,7 @@ func prepareTestServer(t *testing.T, portDoH, portDoT, portDoQ int, ddrEnabled b
TLSConfig: TLSConfig{
ServerName: ddrTestDomainName,
},
ServePlainDNS: true,
},
}
@ -699,6 +702,7 @@ func TestServer_ProcessRestrictLocal(t *testing.T) {
Config: Config{
EDNSClientSubnet: &EDNSClientSubnet{Enabled: false},
},
ServePlainDNS: true,
}, ups)
s.conf.UpstreamConfig.Upstreams = []upstream.Upstream{ups}
startDeferStop(t, s)
@ -776,6 +780,7 @@ func TestServer_ProcessLocalPTR_usingResolvers(t *testing.T) {
Config: Config{
EDNSClientSubnet: &EDNSClientSubnet{Enabled: false},
},
ServePlainDNS: true,
},
aghtest.NewUpstreamMock(func(req *dns.Msg) (resp *dns.Msg, err error) {
return aghalg.Coalesce(

1
internal/dnsforward/svcbmsg_test.go
View file

@ -19,6 +19,7 @@ func TestGenAnswerHTTPS_andSVCB(t *testing.T) {
Config: Config{
EDNSClientSubnet: &EDNSClientSubnet{Enabled: false},
},
ServePlainDNS: true,
}, nil)
req := &dns.Msg{

4
internal/home/config.go
View file

@ -228,6 +228,9 @@ type dnsConfig struct {
// TODO(a.garipov): Add to the UI when HTTP/3 support is no longer
// experimental.
UseHTTP3Upstreams bool `yaml:"use_http3_upstreams"`
// ServePlainDNS defines if plain DNS is allowed for incoming requests.
ServePlainDNS bool `yaml:"serve_plain_dns"`
}
type tlsConfigSettings struct {
@ -335,6 +338,7 @@ var config = &configuration{
},
UpstreamTimeout: timeutil.Duration{Duration: dnsforward.DefaultTimeout},
UsePrivateRDNS: true,
ServePlainDNS: true,
},
TLS: tlsConfigSettings{
PortHTTPS: defaultPortHTTPS,

10
internal/home/dns.go
View file

@ -142,9 +142,12 @@ func initDNSServer(
EtcHosts: Context.etcHosts,
LocalDomain: config.DHCP.LocalDomainName,
})
defer func() {
if err != nil {
closeDNSServer()
}
}()
if err != nil {
return fmt.Errorf("dnsforward.NewServer: %w", err)
}
@ -152,15 +155,11 @@ func initDNSServer(
dnsConf, err := newServerConfig(&config.DNS, config.Clients.Sources, tlsConf, httpReg)
if err != nil {
closeDNSServer()
return fmt.Errorf("newServerConfig: %w", err)
}
err = Context.dnsServer.Prepare(dnsConf)
if err != nil {
closeDNSServer()
return fmt.Errorf("dnsServer.Prepare: %w", err)
}
@ -253,6 +252,7 @@ func newServerConfig(
UsePrivateRDNS: dnsConf.UsePrivateRDNS,
ServeHTTP3: dnsConf.ServeHTTP3,
UseHTTP3Upstreams: dnsConf.UseHTTP3Upstreams,
ServePlainDNS: dnsConf.ServePlainDNS,
}
var initialAddresses []netip.Addr