578 lines
18 KiB
Go
578 lines
18 KiB
Go
package main
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import (
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crypto_rand "crypto/rand"
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"encoding/binary"
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"io"
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"io/ioutil"
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"net"
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"os"
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"sync/atomic"
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"time"
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"github.com/jedisct1/dlog"
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clocksmith "github.com/jedisct1/go-clocksmith"
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stamps "github.com/jedisct1/go-dnsstamps"
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"github.com/miekg/dns"
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"golang.org/x/crypto/curve25519"
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)
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type Proxy struct {
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userName string
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child bool
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proxyPublicKey [32]byte
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proxySecretKey [32]byte
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ephemeralKeys bool
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questionSizeEstimator QuestionSizeEstimator
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serversInfo ServersInfo
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timeout time.Duration
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certRefreshDelay time.Duration
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certRefreshDelayAfterFailure time.Duration
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certIgnoreTimestamp bool
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mainProto string
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listenAddresses []string
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localDoHListenAddresses []string
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localDoHPath string
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localDoHCertFile string
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localDoHCertKeyFile string
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daemonize bool
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registeredServers []RegisteredServer
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registeredRelays []RegisteredServer
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pluginBlockIPv6 bool
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cache bool
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cacheSize int
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cacheNegMinTTL uint32
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cacheNegMaxTTL uint32
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cacheMinTTL uint32
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cacheMaxTTL uint32
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rejectTTL uint32
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cloakTTL uint32
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queryLogFile string
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queryLogFormat string
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queryLogIgnoredQtypes []string
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nxLogFile string
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nxLogFormat string
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blockNameFile string
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whitelistNameFile string
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blockNameLogFile string
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whitelistNameLogFile string
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blockNameFormat string
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whitelistNameFormat string
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blockIPFile string
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blockIPLogFile string
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blockIPFormat string
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forwardFile string
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cloakFile string
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pluginsGlobals PluginsGlobals
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sources []*Source
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clientsCount uint32
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maxClients uint32
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xTransport *XTransport
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allWeeklyRanges *map[string]WeeklyRanges
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logMaxSize int
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logMaxAge int
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logMaxBackups int
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blockedQueryResponse string
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queryMeta []string
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routes *map[string][]string
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serversWithBrokenQueryPadding []string
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showCerts bool
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}
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func (proxy *Proxy) addDNSListener(listenAddrStr string) {
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listenUDPAddr, err := net.ResolveUDPAddr("udp", listenAddrStr)
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if err != nil {
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dlog.Fatal(err)
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}
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listenTCPAddr, err := net.ResolveTCPAddr("tcp", listenAddrStr)
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if err != nil {
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dlog.Fatal(err)
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}
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// if 'userName' is not set, continue as before
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if len(proxy.userName) <= 0 {
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if err := proxy.udpListenerFromAddr(listenUDPAddr); err != nil {
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dlog.Fatal(err)
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}
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if err := proxy.tcpListenerFromAddr(listenTCPAddr); err != nil {
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dlog.Fatal(err)
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}
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return
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}
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// if 'userName' is set and we are the parent process
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if !proxy.child {
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// parent
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listenerUDP, err := net.ListenUDP("udp", listenUDPAddr)
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if err != nil {
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dlog.Fatal(err)
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}
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listenerTCP, err := net.ListenTCP("tcp", listenTCPAddr)
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if err != nil {
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dlog.Fatal(err)
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}
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fdUDP, err := listenerUDP.File() // On Windows, the File method of UDPConn is not implemented.
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if err != nil {
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dlog.Fatalf("Unable to switch to a different user: %v", err)
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}
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fdTCP, err := listenerTCP.File() // On Windows, the File method of TCPListener is not implemented.
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if err != nil {
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dlog.Fatalf("Unable to switch to a different user: %v", err)
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}
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defer listenerUDP.Close()
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defer listenerTCP.Close()
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FileDescriptors = append(FileDescriptors, fdUDP)
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FileDescriptors = append(FileDescriptors, fdTCP)
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return
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}
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// child
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listenerUDP, err := net.FilePacketConn(os.NewFile(uintptr(3+FileDescriptorNum), "listenerUDP"))
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if err != nil {
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dlog.Fatalf("Unable to switch to a different user: %v", err)
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}
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FileDescriptorNum++
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listenerTCP, err := net.FileListener(os.NewFile(uintptr(3+FileDescriptorNum), "listenerTCP"))
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if err != nil {
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dlog.Fatalf("Unable to switch to a different user: %v", err)
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}
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FileDescriptorNum++
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dlog.Noticef("Now listening to %v [UDP]", listenUDPAddr)
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go proxy.udpListener(listenerUDP.(*net.UDPConn))
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dlog.Noticef("Now listening to %v [TCP]", listenAddrStr)
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go proxy.tcpListener(listenerTCP.(*net.TCPListener))
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}
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func (proxy *Proxy) addLocalDoHListener(listenAddrStr string) {
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listenTCPAddr, err := net.ResolveTCPAddr("tcp", listenAddrStr)
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if err != nil {
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dlog.Fatal(err)
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}
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// if 'userName' is not set, continue as before
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if len(proxy.userName) <= 0 {
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if err := proxy.localDoHListenerFromAddr(listenTCPAddr); err != nil {
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dlog.Fatal(err)
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}
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return
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}
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// if 'userName' is set and we are the parent process
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if !proxy.child {
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// parent
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listenerTCP, err := net.ListenTCP("tcp", listenTCPAddr)
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if err != nil {
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dlog.Fatal(err)
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}
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fdTCP, err := listenerTCP.File() // On Windows, the File method of TCPListener is not implemented.
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if err != nil {
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dlog.Fatalf("Unable to switch to a different user: %v", err)
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}
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defer listenerTCP.Close()
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FileDescriptors = append(FileDescriptors, fdTCP)
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return
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}
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// child
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listenerTCP, err := net.FileListener(os.NewFile(uintptr(3+FileDescriptorNum), "listenerTCP"))
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if err != nil {
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dlog.Fatalf("Unable to switch to a different user: %v", err)
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}
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FileDescriptorNum++
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dlog.Noticef("Now listening to %v [DoH]", listenAddrStr)
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go proxy.localDoHListener(listenerTCP.(*net.TCPListener))
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}
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func (proxy *Proxy) StartProxy() {
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proxy.questionSizeEstimator = NewQuestionSizeEstimator()
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if _, err := crypto_rand.Read(proxy.proxySecretKey[:]); err != nil {
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dlog.Fatal(err)
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}
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curve25519.ScalarBaseMult(&proxy.proxyPublicKey, &proxy.proxySecretKey)
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for _, registeredServer := range proxy.registeredServers {
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proxy.serversInfo.registerServer(registeredServer.name, registeredServer.stamp)
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}
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for _, listenAddrStr := range proxy.listenAddresses {
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proxy.addDNSListener(listenAddrStr)
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}
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for _, listenAddrStr := range proxy.localDoHListenAddresses {
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proxy.addLocalDoHListener(listenAddrStr)
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}
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// if 'userName' is set and we are the parent process drop privilege and exit
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if len(proxy.userName) > 0 && !proxy.child {
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proxy.dropPrivilege(proxy.userName, FileDescriptors)
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}
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if err := proxy.SystemDListeners(); err != nil {
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dlog.Fatal(err)
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}
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liveServers, err := proxy.serversInfo.refresh(proxy)
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if liveServers > 0 {
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proxy.certIgnoreTimestamp = false
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}
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if proxy.showCerts {
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os.Exit(0)
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}
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if liveServers > 0 {
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dlog.Noticef("dnscrypt-proxy is ready - live servers: %d", liveServers)
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if !proxy.child {
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if err := ServiceManagerReadyNotify(); err != nil {
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dlog.Fatal(err)
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}
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}
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} else if err != nil {
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dlog.Error(err)
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dlog.Notice("dnscrypt-proxy is waiting for at least one server to be reachable")
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}
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go func() {
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for {
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clocksmith.Sleep(PrefetchSources(proxy.xTransport, proxy.sources))
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}
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}()
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if len(proxy.serversInfo.registeredServers) > 0 {
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go func() {
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for {
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delay := proxy.certRefreshDelay
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if liveServers == 0 {
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delay = proxy.certRefreshDelayAfterFailure
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}
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clocksmith.Sleep(delay)
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liveServers, _ = proxy.serversInfo.refresh(proxy)
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if liveServers > 0 {
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proxy.certIgnoreTimestamp = false
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}
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}
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}()
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}
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}
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func (proxy *Proxy) udpListener(clientPc *net.UDPConn) {
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defer clientPc.Close()
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for {
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buffer := make([]byte, MaxDNSPacketSize-1)
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length, clientAddr, err := clientPc.ReadFrom(buffer)
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if err != nil {
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return
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}
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packet := buffer[:length]
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go func() {
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start := time.Now()
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if !proxy.clientsCountInc() {
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dlog.Warnf("Too many connections (max=%d)", proxy.maxClients)
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return
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}
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defer proxy.clientsCountDec()
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proxy.processIncomingQuery(proxy.serversInfo.getOne(), "udp", proxy.mainProto, packet, &clientAddr, clientPc, start)
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}()
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}
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}
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func (proxy *Proxy) udpListenerFromAddr(listenAddr *net.UDPAddr) error {
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clientPc, err := net.ListenUDP("udp", listenAddr)
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if err != nil {
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return err
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}
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dlog.Noticef("Now listening to %v [UDP]", listenAddr)
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go proxy.udpListener(clientPc)
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return nil
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}
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func (proxy *Proxy) tcpListener(acceptPc *net.TCPListener) {
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defer acceptPc.Close()
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for {
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clientPc, err := acceptPc.Accept()
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if err != nil {
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continue
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}
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go func() {
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start := time.Now()
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defer clientPc.Close()
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if !proxy.clientsCountInc() {
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dlog.Warnf("Too many connections (max=%d)", proxy.maxClients)
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return
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}
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defer proxy.clientsCountDec()
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clientPc.SetDeadline(time.Now().Add(proxy.timeout))
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packet, err := ReadPrefixed(&clientPc)
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if err != nil {
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return
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}
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clientAddr := clientPc.RemoteAddr()
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proxy.processIncomingQuery(proxy.serversInfo.getOne(), "tcp", "tcp", packet, &clientAddr, clientPc, start)
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}()
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}
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}
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func (proxy *Proxy) tcpListenerFromAddr(listenAddr *net.TCPAddr) error {
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acceptPc, err := net.ListenTCP("tcp", listenAddr)
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if err != nil {
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return err
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}
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dlog.Noticef("Now listening to %v [TCP]", listenAddr)
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go proxy.tcpListener(acceptPc)
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return nil
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}
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func (proxy *Proxy) localDoHListenerFromAddr(listenAddr *net.TCPAddr) error {
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acceptPc, err := net.ListenTCP("tcp", listenAddr)
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if err != nil {
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return err
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}
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dlog.Noticef("Now listening to %v [DoH]", listenAddr)
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go proxy.localDoHListener(acceptPc)
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return nil
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}
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func (proxy *Proxy) prepareForRelay(ip net.IP, port int, encryptedQuery *[]byte) {
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anonymizedDNSHeader := []byte{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00}
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relayedQuery := append(anonymizedDNSHeader, ip.To16()...)
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var tmp [2]byte
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binary.BigEndian.PutUint16(tmp[0:2], uint16(port))
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relayedQuery = append(relayedQuery, tmp[:]...)
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relayedQuery = append(relayedQuery, *encryptedQuery...)
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*encryptedQuery = relayedQuery
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}
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func (proxy *Proxy) exchangeWithUDPServer(serverInfo *ServerInfo, sharedKey *[32]byte, encryptedQuery []byte, clientNonce []byte) ([]byte, error) {
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upstreamAddr := serverInfo.UDPAddr
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if serverInfo.RelayUDPAddr != nil {
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upstreamAddr = serverInfo.RelayUDPAddr
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}
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pc, err := net.DialUDP("udp", nil, upstreamAddr)
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if err != nil {
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return nil, err
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}
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defer pc.Close()
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pc.SetDeadline(time.Now().Add(serverInfo.Timeout))
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if serverInfo.RelayUDPAddr != nil {
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proxy.prepareForRelay(serverInfo.UDPAddr.IP, serverInfo.UDPAddr.Port, &encryptedQuery)
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}
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pc.Write(encryptedQuery)
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encryptedResponse := make([]byte, MaxDNSPacketSize)
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length, err := pc.Read(encryptedResponse)
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if err != nil {
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return nil, err
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}
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encryptedResponse = encryptedResponse[:length]
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return proxy.Decrypt(serverInfo, sharedKey, encryptedResponse, clientNonce)
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}
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func (proxy *Proxy) exchangeWithTCPServer(serverInfo *ServerInfo, sharedKey *[32]byte, encryptedQuery []byte, clientNonce []byte) ([]byte, error) {
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upstreamAddr := serverInfo.TCPAddr
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if serverInfo.RelayUDPAddr != nil {
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upstreamAddr = serverInfo.RelayTCPAddr
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}
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var err error
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var pc net.Conn
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proxyDialer := proxy.xTransport.proxyDialer
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if proxyDialer == nil {
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pc, err = net.DialTCP("tcp", nil, upstreamAddr)
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} else {
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pc, err = (*proxyDialer).Dial("tcp", serverInfo.TCPAddr.String())
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}
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if err != nil {
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return nil, err
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}
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defer pc.Close()
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pc.SetDeadline(time.Now().Add(serverInfo.Timeout))
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if serverInfo.RelayTCPAddr != nil {
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proxy.prepareForRelay(serverInfo.TCPAddr.IP, serverInfo.TCPAddr.Port, &encryptedQuery)
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}
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encryptedQuery, err = PrefixWithSize(encryptedQuery)
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if err != nil {
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return nil, err
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}
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pc.Write(encryptedQuery)
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encryptedResponse, err := ReadPrefixed(&pc)
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if err != nil {
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return nil, err
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}
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return proxy.Decrypt(serverInfo, sharedKey, encryptedResponse, clientNonce)
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}
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func (proxy *Proxy) clientsCountInc() bool {
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for {
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count := atomic.LoadUint32(&proxy.clientsCount)
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if count >= proxy.maxClients {
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return false
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}
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if atomic.CompareAndSwapUint32(&proxy.clientsCount, count, count+1) {
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dlog.Debugf("clients count: %d", count+1)
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return true
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}
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}
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}
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func (proxy *Proxy) clientsCountDec() {
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for {
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if count := atomic.LoadUint32(&proxy.clientsCount); count == 0 || atomic.CompareAndSwapUint32(&proxy.clientsCount, count, count-1) {
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break
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}
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}
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}
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func (proxy *Proxy) processIncomingQuery(serverInfo *ServerInfo, clientProto string, serverProto string, query []byte, clientAddr *net.Addr, clientPc net.Conn, start time.Time) (response []byte) {
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if len(query) < MinDNSPacketSize {
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return
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}
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pluginsState := NewPluginsState(proxy, clientProto, clientAddr, start)
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serverName := "-"
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if serverInfo != nil {
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serverName = serverInfo.Name
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}
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query, _ = pluginsState.ApplyQueryPlugins(&proxy.pluginsGlobals, query, serverName)
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if len(query) < MinDNSPacketSize || len(query) > MaxDNSPacketSize {
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return
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}
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var err error
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if pluginsState.action != PluginsActionForward {
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if pluginsState.synthResponse != nil {
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response, err = pluginsState.synthResponse.PackBuffer(response)
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if err != nil {
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pluginsState.returnCode = PluginsReturnCodeParseError
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pluginsState.ApplyLoggingPlugins(&proxy.pluginsGlobals)
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return
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}
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}
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if pluginsState.action == PluginsActionDrop {
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pluginsState.returnCode = PluginsReturnCodeDrop
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pluginsState.ApplyLoggingPlugins(&proxy.pluginsGlobals)
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return
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}
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} else {
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pluginsState.returnCode = PluginsReturnCodeForward
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}
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if len(response) == 0 && serverInfo != nil {
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var ttl *uint32
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if serverInfo.Proto == stamps.StampProtoTypeDNSCrypt {
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sharedKey, encryptedQuery, clientNonce, err := proxy.Encrypt(serverInfo, query, serverProto)
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if err != nil {
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pluginsState.returnCode = PluginsReturnCodeParseError
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pluginsState.ApplyLoggingPlugins(&proxy.pluginsGlobals)
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return
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}
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serverInfo.noticeBegin(proxy)
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if serverProto == "udp" {
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response, err = proxy.exchangeWithUDPServer(serverInfo, sharedKey, encryptedQuery, clientNonce)
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if err == nil && len(response) >= MinDNSPacketSize && response[2]&0x02 == 0x02 {
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serverProto = "tcp"
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sharedKey, encryptedQuery, clientNonce, err = proxy.Encrypt(serverInfo, query, serverProto)
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if err != nil {
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pluginsState.returnCode = PluginsReturnCodeParseError
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pluginsState.ApplyLoggingPlugins(&proxy.pluginsGlobals)
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return
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}
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response, err = proxy.exchangeWithTCPServer(serverInfo, sharedKey, encryptedQuery, clientNonce)
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}
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} else {
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response, err = proxy.exchangeWithTCPServer(serverInfo, sharedKey, encryptedQuery, clientNonce)
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}
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if err != nil {
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if neterr, ok := err.(net.Error); ok && neterr.Timeout() {
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pluginsState.returnCode = PluginsReturnCodeServerTimeout
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} else {
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pluginsState.returnCode = PluginsReturnCodeNetworkError
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}
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pluginsState.ApplyLoggingPlugins(&proxy.pluginsGlobals)
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serverInfo.noticeFailure(proxy)
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return
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}
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} else if serverInfo.Proto == stamps.StampProtoTypeDoH {
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tid := TransactionID(query)
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SetTransactionID(query, 0)
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serverInfo.noticeBegin(proxy)
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resp, _, err := proxy.xTransport.DoHQuery(serverInfo.useGet, serverInfo.URL, query, proxy.timeout)
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SetTransactionID(query, tid)
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if err != nil {
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pluginsState.returnCode = PluginsReturnCodeNetworkError
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pluginsState.ApplyLoggingPlugins(&proxy.pluginsGlobals)
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serverInfo.noticeFailure(proxy)
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return
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}
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response, err = ioutil.ReadAll(io.LimitReader(resp.Body, int64(MaxDNSPacketSize)))
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if err != nil {
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pluginsState.returnCode = PluginsReturnCodeNetworkError
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pluginsState.ApplyLoggingPlugins(&proxy.pluginsGlobals)
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serverInfo.noticeFailure(proxy)
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return
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}
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if len(response) >= MinDNSPacketSize {
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SetTransactionID(response, tid)
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}
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} else {
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dlog.Fatal("Unsupported protocol")
|
|
}
|
|
if len(response) < MinDNSPacketSize || len(response) > MaxDNSPacketSize {
|
|
pluginsState.returnCode = PluginsReturnCodeParseError
|
|
pluginsState.ApplyLoggingPlugins(&proxy.pluginsGlobals)
|
|
serverInfo.noticeFailure(proxy)
|
|
return
|
|
}
|
|
response, err = pluginsState.ApplyResponsePlugins(&proxy.pluginsGlobals, response, ttl)
|
|
if err != nil {
|
|
pluginsState.returnCode = PluginsReturnCodeParseError
|
|
pluginsState.ApplyLoggingPlugins(&proxy.pluginsGlobals)
|
|
serverInfo.noticeFailure(proxy)
|
|
return
|
|
}
|
|
if rcode := Rcode(response); rcode == dns.RcodeServerFailure { // SERVFAIL
|
|
dlog.Infof("Server [%v] returned temporary error code [%v] -- Upstream server may be experiencing connectivity issues", serverInfo.Name, rcode)
|
|
serverInfo.noticeFailure(proxy)
|
|
} else {
|
|
serverInfo.noticeSuccess(proxy)
|
|
}
|
|
}
|
|
if len(response) < MinDNSPacketSize || len(response) > MaxDNSPacketSize {
|
|
pluginsState.returnCode = PluginsReturnCodeParseError
|
|
pluginsState.ApplyLoggingPlugins(&proxy.pluginsGlobals)
|
|
if serverInfo != nil {
|
|
serverInfo.noticeFailure(proxy)
|
|
}
|
|
return
|
|
}
|
|
if clientProto == "udp" {
|
|
if len(response) > pluginsState.maxUnencryptedUDPSafePayloadSize {
|
|
response, err = TruncatedResponse(response)
|
|
if err != nil {
|
|
pluginsState.returnCode = PluginsReturnCodeParseError
|
|
pluginsState.ApplyLoggingPlugins(&proxy.pluginsGlobals)
|
|
return
|
|
}
|
|
}
|
|
clientPc.(net.PacketConn).WriteTo(response, *clientAddr)
|
|
if HasTCFlag(response) {
|
|
proxy.questionSizeEstimator.blindAdjust()
|
|
} else {
|
|
proxy.questionSizeEstimator.adjust(ResponseOverhead + len(response))
|
|
}
|
|
} else if clientProto == "tcp" {
|
|
response, err = PrefixWithSize(response)
|
|
if err != nil {
|
|
pluginsState.returnCode = PluginsReturnCodeParseError
|
|
pluginsState.ApplyLoggingPlugins(&proxy.pluginsGlobals)
|
|
if serverInfo != nil {
|
|
serverInfo.noticeFailure(proxy)
|
|
}
|
|
return
|
|
}
|
|
if clientPc != nil {
|
|
clientPc.Write(response)
|
|
}
|
|
}
|
|
pluginsState.ApplyLoggingPlugins(&proxy.pluginsGlobals)
|
|
|
|
return response
|
|
}
|
|
|
|
func NewProxy() *Proxy {
|
|
return &Proxy{
|
|
serversInfo: NewServersInfo(),
|
|
}
|
|
}
|