467 lines
11 KiB
Go
467 lines
11 KiB
Go
package home
|
|
|
|
import (
|
|
"fmt"
|
|
"net"
|
|
"net/url"
|
|
"os"
|
|
"path/filepath"
|
|
|
|
"github.com/AdguardTeam/AdGuardHome/internal/aghnet"
|
|
"github.com/AdguardTeam/AdGuardHome/internal/dnsforward"
|
|
"github.com/AdguardTeam/AdGuardHome/internal/filtering"
|
|
"github.com/AdguardTeam/AdGuardHome/internal/querylog"
|
|
"github.com/AdguardTeam/AdGuardHome/internal/stats"
|
|
"github.com/AdguardTeam/dnsproxy/proxy"
|
|
"github.com/AdguardTeam/golibs/errors"
|
|
"github.com/AdguardTeam/golibs/log"
|
|
"github.com/AdguardTeam/golibs/netutil"
|
|
"github.com/ameshkov/dnscrypt/v2"
|
|
yaml "gopkg.in/yaml.v2"
|
|
)
|
|
|
|
// Default ports.
|
|
const (
|
|
defaultPortDNS = 53
|
|
defaultPortHTTP = 80
|
|
defaultPortHTTPS = 443
|
|
defaultPortQUIC = 853
|
|
defaultPortTLS = 853
|
|
)
|
|
|
|
// Called by other modules when configuration is changed
|
|
func onConfigModified() {
|
|
_ = config.write()
|
|
}
|
|
|
|
// initDNSServer creates an instance of the dnsforward.Server
|
|
// Please note that we must do it even if we don't start it
|
|
// so that we had access to the query log and the stats
|
|
func initDNSServer() (err error) {
|
|
baseDir := Context.getDataDir()
|
|
|
|
var anonFunc aghnet.IPMutFunc
|
|
if config.DNS.AnonymizeClientIP {
|
|
anonFunc = querylog.AnonymizeIP
|
|
}
|
|
anonymizer := aghnet.NewIPMut(anonFunc)
|
|
|
|
statsConf := stats.Config{
|
|
Filename: filepath.Join(baseDir, "stats.db"),
|
|
LimitDays: config.DNS.StatsInterval,
|
|
ConfigModified: onConfigModified,
|
|
HTTPRegister: httpRegister,
|
|
}
|
|
Context.stats, err = stats.New(statsConf)
|
|
if err != nil {
|
|
return fmt.Errorf("init stats: %w", err)
|
|
}
|
|
|
|
conf := querylog.Config{
|
|
Anonymizer: anonymizer,
|
|
ConfigModified: onConfigModified,
|
|
HTTPRegister: httpRegister,
|
|
FindClient: Context.clients.findMultiple,
|
|
BaseDir: baseDir,
|
|
RotationIvl: config.DNS.QueryLogInterval.Duration,
|
|
MemSize: config.DNS.QueryLogMemSize,
|
|
Enabled: config.DNS.QueryLogEnabled,
|
|
FileEnabled: config.DNS.QueryLogFileEnabled,
|
|
AnonymizeClientIP: config.DNS.AnonymizeClientIP,
|
|
}
|
|
Context.queryLog = querylog.New(conf)
|
|
|
|
filterConf := config.DNS.DnsfilterConf
|
|
filterConf.EtcHosts = Context.etcHosts
|
|
filterConf.ConfigModified = onConfigModified
|
|
filterConf.HTTPRegister = httpRegister
|
|
Context.dnsFilter = filtering.New(&filterConf, nil)
|
|
|
|
var privateNets netutil.SubnetSet
|
|
switch len(config.DNS.PrivateNets) {
|
|
case 0:
|
|
// Use an optimized locally-served matcher.
|
|
privateNets = netutil.SubnetSetFunc(netutil.IsLocallyServed)
|
|
case 1:
|
|
var n *net.IPNet
|
|
n, err = netutil.ParseSubnet(config.DNS.PrivateNets[0])
|
|
if err != nil {
|
|
return fmt.Errorf("preparing the set of private subnets: %w", err)
|
|
}
|
|
|
|
privateNets = n
|
|
default:
|
|
var nets []*net.IPNet
|
|
nets, err = netutil.ParseSubnets(config.DNS.PrivateNets...)
|
|
if err != nil {
|
|
return fmt.Errorf("preparing the set of private subnets: %w", err)
|
|
}
|
|
|
|
privateNets = netutil.SliceSubnetSet(nets)
|
|
}
|
|
|
|
p := dnsforward.DNSCreateParams{
|
|
DNSFilter: Context.dnsFilter,
|
|
Stats: Context.stats,
|
|
QueryLog: Context.queryLog,
|
|
PrivateNets: privateNets,
|
|
Anonymizer: anonymizer,
|
|
LocalDomain: config.DHCP.LocalDomainName,
|
|
}
|
|
if Context.dhcpServer != nil {
|
|
p.DHCPServer = Context.dhcpServer
|
|
}
|
|
|
|
Context.dnsServer, err = dnsforward.NewServer(p)
|
|
if err != nil {
|
|
closeDNSServer()
|
|
|
|
return fmt.Errorf("dnsforward.NewServer: %w", err)
|
|
}
|
|
|
|
Context.clients.dnsServer = Context.dnsServer
|
|
var dnsConfig dnsforward.ServerConfig
|
|
dnsConfig, err = generateServerConfig()
|
|
if err != nil {
|
|
closeDNSServer()
|
|
|
|
return fmt.Errorf("generateServerConfig: %w", err)
|
|
}
|
|
|
|
err = Context.dnsServer.Prepare(&dnsConfig)
|
|
if err != nil {
|
|
closeDNSServer()
|
|
|
|
return fmt.Errorf("dnsServer.Prepare: %w", err)
|
|
}
|
|
|
|
if config.Clients.Sources.RDNS {
|
|
Context.rdns = NewRDNS(Context.dnsServer, &Context.clients, config.DNS.UsePrivateRDNS)
|
|
}
|
|
|
|
if config.Clients.Sources.WHOIS {
|
|
Context.whois = initWHOIS(&Context.clients)
|
|
}
|
|
|
|
Context.filters.Init()
|
|
return nil
|
|
}
|
|
|
|
func isRunning() bool {
|
|
return Context.dnsServer != nil && Context.dnsServer.IsRunning()
|
|
}
|
|
|
|
func onDNSRequest(pctx *proxy.DNSContext) {
|
|
ip, _ := netutil.IPAndPortFromAddr(pctx.Addr)
|
|
if ip == nil {
|
|
// This would be quite weird if we get here.
|
|
return
|
|
}
|
|
|
|
srcs := config.Clients.Sources
|
|
if srcs.RDNS && !ip.IsLoopback() {
|
|
Context.rdns.Begin(ip)
|
|
}
|
|
if srcs.WHOIS && !netutil.IsSpecialPurpose(ip) {
|
|
Context.whois.Begin(ip)
|
|
}
|
|
}
|
|
|
|
func ipsToTCPAddrs(ips []net.IP, port int) (tcpAddrs []*net.TCPAddr) {
|
|
if ips == nil {
|
|
return nil
|
|
}
|
|
|
|
tcpAddrs = make([]*net.TCPAddr, len(ips))
|
|
for i, ip := range ips {
|
|
tcpAddrs[i] = &net.TCPAddr{
|
|
IP: ip,
|
|
Port: port,
|
|
}
|
|
}
|
|
|
|
return tcpAddrs
|
|
}
|
|
|
|
func ipsToUDPAddrs(ips []net.IP, port int) (udpAddrs []*net.UDPAddr) {
|
|
if ips == nil {
|
|
return nil
|
|
}
|
|
|
|
udpAddrs = make([]*net.UDPAddr, len(ips))
|
|
for i, ip := range ips {
|
|
udpAddrs[i] = &net.UDPAddr{
|
|
IP: ip,
|
|
Port: port,
|
|
}
|
|
}
|
|
|
|
return udpAddrs
|
|
}
|
|
|
|
func generateServerConfig() (newConf dnsforward.ServerConfig, err error) {
|
|
dnsConf := config.DNS
|
|
hosts := dnsConf.BindHosts
|
|
if len(hosts) == 0 {
|
|
hosts = []net.IP{{127, 0, 0, 1}}
|
|
}
|
|
|
|
newConf = dnsforward.ServerConfig{
|
|
UDPListenAddrs: ipsToUDPAddrs(hosts, dnsConf.Port),
|
|
TCPListenAddrs: ipsToTCPAddrs(hosts, dnsConf.Port),
|
|
FilteringConfig: dnsConf.FilteringConfig,
|
|
ConfigModified: onConfigModified,
|
|
HTTPRegister: httpRegister,
|
|
OnDNSRequest: onDNSRequest,
|
|
}
|
|
|
|
tlsConf := tlsConfigSettings{}
|
|
Context.tls.WriteDiskConfig(&tlsConf)
|
|
if tlsConf.Enabled {
|
|
newConf.TLSConfig = tlsConf.TLSConfig
|
|
newConf.TLSConfig.ServerName = tlsConf.ServerName
|
|
|
|
if tlsConf.PortDNSOverTLS != 0 {
|
|
newConf.TLSListenAddrs = ipsToTCPAddrs(hosts, tlsConf.PortDNSOverTLS)
|
|
}
|
|
|
|
if tlsConf.PortDNSOverQUIC != 0 {
|
|
newConf.QUICListenAddrs = ipsToUDPAddrs(hosts, tlsConf.PortDNSOverQUIC)
|
|
}
|
|
|
|
if tlsConf.PortDNSCrypt != 0 {
|
|
newConf.DNSCryptConfig, err = newDNSCrypt(hosts, tlsConf)
|
|
if err != nil {
|
|
// Don't wrap the error, because it's already
|
|
// wrapped by newDNSCrypt.
|
|
return dnsforward.ServerConfig{}, err
|
|
}
|
|
}
|
|
}
|
|
|
|
newConf.TLSv12Roots = Context.tlsRoots
|
|
newConf.TLSAllowUnencryptedDoH = tlsConf.AllowUnencryptedDoH
|
|
|
|
newConf.FilterHandler = applyAdditionalFiltering
|
|
newConf.GetCustomUpstreamByClient = Context.clients.findUpstreams
|
|
|
|
newConf.ResolveClients = config.Clients.Sources.RDNS
|
|
newConf.UsePrivateRDNS = dnsConf.UsePrivateRDNS
|
|
newConf.LocalPTRResolvers = dnsConf.LocalPTRResolvers
|
|
newConf.UpstreamTimeout = dnsConf.UpstreamTimeout.Duration
|
|
|
|
return newConf, nil
|
|
}
|
|
|
|
func newDNSCrypt(hosts []net.IP, tlsConf tlsConfigSettings) (dnscc dnsforward.DNSCryptConfig, err error) {
|
|
if tlsConf.DNSCryptConfigFile == "" {
|
|
return dnscc, errors.Error("no dnscrypt_config_file")
|
|
}
|
|
|
|
f, err := os.Open(tlsConf.DNSCryptConfigFile)
|
|
if err != nil {
|
|
return dnscc, fmt.Errorf("opening dnscrypt config: %w", err)
|
|
}
|
|
defer func() { err = errors.WithDeferred(err, f.Close()) }()
|
|
|
|
rc := &dnscrypt.ResolverConfig{}
|
|
err = yaml.NewDecoder(f).Decode(rc)
|
|
if err != nil {
|
|
return dnscc, fmt.Errorf("decoding dnscrypt config: %w", err)
|
|
}
|
|
|
|
cert, err := rc.CreateCert()
|
|
if err != nil {
|
|
return dnscc, fmt.Errorf("creating dnscrypt cert: %w", err)
|
|
}
|
|
|
|
return dnsforward.DNSCryptConfig{
|
|
UDPListenAddrs: ipsToUDPAddrs(hosts, tlsConf.PortDNSCrypt),
|
|
TCPListenAddrs: ipsToTCPAddrs(hosts, tlsConf.PortDNSCrypt),
|
|
ResolverCert: cert,
|
|
ProviderName: rc.ProviderName,
|
|
Enabled: true,
|
|
}, nil
|
|
}
|
|
|
|
type dnsEncryption struct {
|
|
https string
|
|
tls string
|
|
quic string
|
|
}
|
|
|
|
func getDNSEncryption() (de dnsEncryption) {
|
|
tlsConf := tlsConfigSettings{}
|
|
|
|
Context.tls.WriteDiskConfig(&tlsConf)
|
|
|
|
if tlsConf.Enabled && len(tlsConf.ServerName) != 0 {
|
|
hostname := tlsConf.ServerName
|
|
if tlsConf.PortHTTPS != 0 {
|
|
addr := hostname
|
|
if tlsConf.PortHTTPS != defaultPortHTTPS {
|
|
addr = netutil.JoinHostPort(addr, tlsConf.PortHTTPS)
|
|
}
|
|
|
|
de.https = (&url.URL{
|
|
Scheme: "https",
|
|
Host: addr,
|
|
Path: "/dns-query",
|
|
}).String()
|
|
}
|
|
|
|
if tlsConf.PortDNSOverTLS != 0 {
|
|
de.tls = (&url.URL{
|
|
Scheme: "tls",
|
|
Host: netutil.JoinHostPort(hostname, tlsConf.PortDNSOverTLS),
|
|
}).String()
|
|
}
|
|
|
|
if tlsConf.PortDNSOverQUIC != 0 {
|
|
de.quic = (&url.URL{
|
|
Scheme: "quic",
|
|
Host: netutil.JoinHostPort(hostname, tlsConf.PortDNSOverQUIC),
|
|
}).String()
|
|
}
|
|
}
|
|
|
|
return de
|
|
}
|
|
|
|
// applyAdditionalFiltering adds additional client information and settings if
|
|
// the client has them.
|
|
func applyAdditionalFiltering(clientIP net.IP, clientID string, setts *filtering.Settings) {
|
|
Context.dnsFilter.ApplyBlockedServices(setts, nil, true)
|
|
|
|
log.Debug("looking up settings for client with ip %s and clientid %q", clientIP, clientID)
|
|
|
|
if clientIP == nil {
|
|
return
|
|
}
|
|
|
|
setts.ClientIP = clientIP
|
|
|
|
c, ok := Context.clients.Find(clientID)
|
|
if !ok {
|
|
c, ok = Context.clients.Find(clientIP.String())
|
|
if !ok {
|
|
log.Debug("client with ip %s and clientid %q not found", clientIP, clientID)
|
|
|
|
return
|
|
}
|
|
}
|
|
|
|
log.Debug("using settings for client %q with ip %s and clientid %q", c.Name, clientIP, clientID)
|
|
|
|
if c.UseOwnBlockedServices {
|
|
Context.dnsFilter.ApplyBlockedServices(setts, c.BlockedServices, false)
|
|
}
|
|
|
|
setts.ClientName = c.Name
|
|
setts.ClientTags = c.Tags
|
|
if !c.UseOwnSettings {
|
|
return
|
|
}
|
|
|
|
setts.FilteringEnabled = c.FilteringEnabled
|
|
setts.SafeSearchEnabled = c.SafeSearchEnabled
|
|
setts.SafeBrowsingEnabled = c.SafeBrowsingEnabled
|
|
setts.ParentalEnabled = c.ParentalEnabled
|
|
}
|
|
|
|
func startDNSServer() error {
|
|
config.RLock()
|
|
defer config.RUnlock()
|
|
|
|
if isRunning() {
|
|
return fmt.Errorf("unable to start forwarding DNS server: Already running")
|
|
}
|
|
|
|
enableFiltersLocked(false)
|
|
|
|
Context.clients.Start()
|
|
|
|
err := Context.dnsServer.Start()
|
|
if err != nil {
|
|
return fmt.Errorf("couldn't start forwarding DNS server: %w", err)
|
|
}
|
|
|
|
Context.dnsFilter.Start()
|
|
Context.filters.Start()
|
|
Context.stats.Start()
|
|
Context.queryLog.Start()
|
|
|
|
const topClientsNumber = 100 // the number of clients to get
|
|
for _, ip := range Context.stats.GetTopClientsIP(topClientsNumber) {
|
|
if ip == nil {
|
|
continue
|
|
}
|
|
|
|
srcs := config.Clients.Sources
|
|
if srcs.RDNS && !ip.IsLoopback() {
|
|
Context.rdns.Begin(ip)
|
|
}
|
|
if srcs.WHOIS && !netutil.IsSpecialPurpose(ip) {
|
|
Context.whois.Begin(ip)
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func reconfigureDNSServer() (err error) {
|
|
var newConf dnsforward.ServerConfig
|
|
newConf, err = generateServerConfig()
|
|
if err != nil {
|
|
return fmt.Errorf("generating forwarding dns server config: %w", err)
|
|
}
|
|
|
|
err = Context.dnsServer.Reconfigure(&newConf)
|
|
if err != nil {
|
|
return fmt.Errorf("starting forwarding dns server: %w", err)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func stopDNSServer() error {
|
|
if !isRunning() {
|
|
return nil
|
|
}
|
|
|
|
err := Context.dnsServer.Stop()
|
|
if err != nil {
|
|
return fmt.Errorf("couldn't stop forwarding DNS server: %w", err)
|
|
}
|
|
|
|
closeDNSServer()
|
|
return nil
|
|
}
|
|
|
|
func closeDNSServer() {
|
|
// DNS forward module must be closed BEFORE stats or queryLog because it depends on them
|
|
if Context.dnsServer != nil {
|
|
Context.dnsServer.Close()
|
|
Context.dnsServer = nil
|
|
}
|
|
|
|
if Context.dnsFilter != nil {
|
|
Context.dnsFilter.Close()
|
|
Context.dnsFilter = nil
|
|
}
|
|
|
|
if Context.stats != nil {
|
|
Context.stats.Close()
|
|
Context.stats = nil
|
|
}
|
|
|
|
if Context.queryLog != nil {
|
|
Context.queryLog.Close()
|
|
Context.queryLog = nil
|
|
}
|
|
|
|
Context.filters.Close()
|
|
|
|
log.Debug("Closed all DNS modules")
|
|
}
|