+(dnsforward): added bogus-nxdomain setting
Closes: https://github.com/AdguardTeam/AdGuardHome/issues/1545
This commit is contained in:
Andrey Meshkov
parent
0311e53ebb
commit
8909599739
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@ -0,0 +1,270 @@
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package dnsforward
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import (
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"crypto/tls"
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"crypto/x509"
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"errors"
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"fmt"
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"net"
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"net/http"
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"sort"
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"github.com/AdguardTeam/golibs/log"
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"github.com/joomcode/errorx"
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"github.com/AdguardTeam/AdGuardHome/dnsfilter"
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"github.com/AdguardTeam/dnsproxy/proxy"
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"github.com/AdguardTeam/dnsproxy/upstream"
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)
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// FilteringConfig represents the DNS filtering configuration of AdGuard Home
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// The zero FilteringConfig is empty and ready for use.
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type FilteringConfig struct {
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// Callbacks for other modules
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// --
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// Filtering callback function
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FilterHandler func(clientAddr string, settings *dnsfilter.RequestFilteringSettings) `yaml:"-"`
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// This callback function returns the list of upstream servers for a client specified by IP address
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GetUpstreamsByClient func(clientAddr string) []upstream.Upstream `yaml:"-"`
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// Protection configuration
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// --
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ProtectionEnabled bool `yaml:"protection_enabled"` // whether or not use any of dnsfilter features
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BlockingMode string `yaml:"blocking_mode"` // mode how to answer filtered requests
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BlockingIPv4 string `yaml:"blocking_ipv4"` // IP address to be returned for a blocked A request
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BlockingIPv6 string `yaml:"blocking_ipv6"` // IP address to be returned for a blocked AAAA request
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BlockingIPAddrv4 net.IP `yaml:"-"`
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BlockingIPAddrv6 net.IP `yaml:"-"`
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BlockedResponseTTL uint32 `yaml:"blocked_response_ttl"` // if 0, then default is used (3600)
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// IP (or domain name) which is used to respond to DNS requests blocked by parental control or safe-browsing
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ParentalBlockHost string `yaml:"parental_block_host"`
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SafeBrowsingBlockHost string `yaml:"safebrowsing_block_host"`
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// Anti-DNS amplification
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// --
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Ratelimit uint32 `yaml:"ratelimit"` // max number of requests per second from a given IP (0 to disable)
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RatelimitWhitelist []string `yaml:"ratelimit_whitelist"` // a list of whitelisted client IP addresses
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RefuseAny bool `yaml:"refuse_any"` // if true, refuse ANY requests
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// Upstream DNS servers configuration
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// --
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UpstreamDNS []string `yaml:"upstream_dns"`
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BootstrapDNS []string `yaml:"bootstrap_dns"` // a list of bootstrap DNS for DoH and DoT (plain DNS only)
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AllServers bool `yaml:"all_servers"` // if true, parallel queries to all configured upstream servers are enabled
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FastestAddr bool `yaml:"fastest_addr"` // use Fastest Address algorithm
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// ECS settings
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// --
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EnableEDNSClientSubnet bool `yaml:"edns_client_subnet"` // Enable EDNS Client Subnet option
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EnableDNSSEC bool `yaml:"enable_dnssec"` // Set DNSSEC flag in outcoming DNS request
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// Access settings
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// --
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AllowedClients []string `yaml:"allowed_clients"` // IP addresses of whitelist clients
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DisallowedClients []string `yaml:"disallowed_clients"` // IP addresses of clients that should be blocked
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BlockedHosts []string `yaml:"blocked_hosts"` // hosts that should be blocked
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// DNS cache settings
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// --
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CacheSize uint32 `yaml:"cache_size"` // DNS cache size (in bytes)
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CacheMinTTL uint32 `yaml:"cache_ttl_min"` // override TTL value (minimum) received from upstream server
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CacheMaxTTL uint32 `yaml:"cache_ttl_max"` // override TTL value (maximum) received from upstream server
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// Other settings
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// --
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BogusNXDomain []string `yaml:"bogus_nxdomain"` // transform responses with these IP addresses to NXDOMAIN
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AAAADisabled bool `yaml:"aaaa_disabled"` // Respond with an empty answer to all AAAA requests
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}
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// TLSConfig is the TLS configuration for HTTPS, DNS-over-HTTPS, and DNS-over-TLS
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type TLSConfig struct {
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TLSListenAddr *net.TCPAddr `yaml:"-" json:"-"`
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StrictSNICheck bool `yaml:"strict_sni_check" json:"-"` // Reject connection if the client uses server name (in SNI) that doesn't match the certificate
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CertificateChain string `yaml:"certificate_chain" json:"certificate_chain"` // PEM-encoded certificates chain
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PrivateKey string `yaml:"private_key" json:"private_key"` // PEM-encoded private key
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CertificatePath string `yaml:"certificate_path" json:"certificate_path"` // certificate file name
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PrivateKeyPath string `yaml:"private_key_path" json:"private_key_path"` // private key file name
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CertificateChainData []byte `yaml:"-" json:"-"`
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PrivateKeyData []byte `yaml:"-" json:"-"`
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cert tls.Certificate // nolint(structcheck) - linter thinks that this field is unused, while TLSConfig is directly included into ServerConfig
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dnsNames []string // nolint(structcheck) // DNS names from certificate (SAN) or CN value from Subject
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}
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// ServerConfig represents server configuration.
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// The zero ServerConfig is empty and ready for use.
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type ServerConfig struct {
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UDPListenAddr *net.UDPAddr // UDP listen address
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TCPListenAddr *net.TCPAddr // TCP listen address
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Upstreams []upstream.Upstream // Configured upstreams
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DomainsReservedUpstreams map[string][]upstream.Upstream // Map of domains and lists of configured upstreams
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OnDNSRequest func(d *proxy.DNSContext)
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FilteringConfig
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TLSConfig
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TLSAllowUnencryptedDOH bool
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TLSv12Roots *x509.CertPool // list of root CAs for TLSv1.2
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TLSCiphers []uint16 // list of TLS ciphers to use
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// Called when the configuration is changed by HTTP request
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ConfigModified func()
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// Register an HTTP handler
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HTTPRegister func(string, string, func(http.ResponseWriter, *http.Request))
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}
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// if any of ServerConfig values are zero, then default values from below are used
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var defaultValues = ServerConfig{
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UDPListenAddr: &net.UDPAddr{Port: 53},
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TCPListenAddr: &net.TCPAddr{Port: 53},
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FilteringConfig: FilteringConfig{BlockedResponseTTL: 3600},
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}
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// createProxyConfig creates and validates configuration for the main proxy
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func (s *Server) createProxyConfig() (proxy.Config, error) {
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proxyConfig := proxy.Config{
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UDPListenAddr: s.conf.UDPListenAddr,
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TCPListenAddr: s.conf.TCPListenAddr,
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Ratelimit: int(s.conf.Ratelimit),
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RatelimitWhitelist: s.conf.RatelimitWhitelist,
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RefuseAny: s.conf.RefuseAny,
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CacheEnabled: true,
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CacheSizeBytes: int(s.conf.CacheSize),
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CacheMinTTL: s.conf.CacheMinTTL,
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CacheMaxTTL: s.conf.CacheMaxTTL,
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Upstreams: s.conf.Upstreams,
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DomainsReservedUpstreams: s.conf.DomainsReservedUpstreams,
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BeforeRequestHandler: s.beforeRequestHandler,
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RequestHandler: s.handleDNSRequest,
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AllServers: s.conf.AllServers,
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EnableEDNSClientSubnet: s.conf.EnableEDNSClientSubnet,
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FindFastestAddr: s.conf.FastestAddr,
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}
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if len(s.conf.BogusNXDomain) > 0 {
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for _, s := range s.conf.BogusNXDomain {
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ip := net.ParseIP(s)
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if ip == nil {
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log.Error("Invalid bogus IP: %s", s)
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} else {
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proxyConfig.BogusNXDomain = append(proxyConfig.BogusNXDomain, ip)
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}
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}
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}
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// TLS settings
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err := s.prepareTLS(&proxyConfig)
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if err != nil {
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return proxyConfig, err
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}
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// Validate proxy config
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if len(proxyConfig.Upstreams) == 0 {
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return proxyConfig, errors.New("no upstream servers configured")
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}
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return proxyConfig, nil
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}
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// initDefaultSettings initializes default settings if nothing
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// is configured
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func (s *Server) initDefaultSettings() {
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if len(s.conf.UpstreamDNS) == 0 {
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s.conf.UpstreamDNS = defaultDNS
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}
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if len(s.conf.BootstrapDNS) == 0 {
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s.conf.BootstrapDNS = defaultBootstrap
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}
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if len(s.conf.ParentalBlockHost) == 0 {
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s.conf.ParentalBlockHost = parentalBlockHost
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}
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if len(s.conf.SafeBrowsingBlockHost) == 0 {
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s.conf.SafeBrowsingBlockHost = safeBrowsingBlockHost
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}
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if s.conf.UDPListenAddr == nil {
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s.conf.UDPListenAddr = defaultValues.UDPListenAddr
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}
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if s.conf.TCPListenAddr == nil {
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s.conf.TCPListenAddr = defaultValues.TCPListenAddr
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}
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}
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// prepareUpstreamSettings - prepares upstream DNS server settings
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func (s *Server) prepareUpstreamSettings() error {
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upstreamConfig, err := proxy.ParseUpstreamsConfig(s.conf.UpstreamDNS, s.conf.BootstrapDNS, DefaultTimeout)
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if err != nil {
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return fmt.Errorf("DNS: proxy.ParseUpstreamsConfig: %s", err)
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}
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s.conf.Upstreams = upstreamConfig.Upstreams
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s.conf.DomainsReservedUpstreams = upstreamConfig.DomainReservedUpstreams
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return nil
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}
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// prepareIntlProxy - initializes DNS proxy that we use for internal DNS queries
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func (s *Server) prepareIntlProxy() {
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intlProxyConfig := proxy.Config{
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CacheEnabled: true,
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CacheSizeBytes: 4096,
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Upstreams: s.conf.Upstreams,
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DomainsReservedUpstreams: s.conf.DomainsReservedUpstreams,
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}
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s.internalProxy = &proxy.Proxy{Config: intlProxyConfig}
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}
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// prepareTLS - prepares TLS configuration for the DNS proxy
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func (s *Server) prepareTLS(proxyConfig *proxy.Config) error {
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if s.conf.TLSListenAddr != nil && len(s.conf.CertificateChainData) != 0 && len(s.conf.PrivateKeyData) != 0 {
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proxyConfig.TLSListenAddr = s.conf.TLSListenAddr
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var err error
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s.conf.cert, err = tls.X509KeyPair(s.conf.CertificateChainData, s.conf.PrivateKeyData)
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if err != nil {
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return errorx.Decorate(err, "Failed to parse TLS keypair")
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}
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if s.conf.StrictSNICheck {
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x, err := x509.ParseCertificate(s.conf.cert.Certificate[0])
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if err != nil {
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return errorx.Decorate(err, "x509.ParseCertificate(): %s", err)
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}
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if len(x.DNSNames) != 0 {
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s.conf.dnsNames = x.DNSNames
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log.Debug("DNS: using DNS names from certificate's SAN: %v", x.DNSNames)
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sort.Strings(s.conf.dnsNames)
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} else {
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s.conf.dnsNames = append(s.conf.dnsNames, x.Subject.CommonName)
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log.Debug("DNS: using DNS name from certificate's CN: %s", x.Subject.CommonName)
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}
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}
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proxyConfig.TLSConfig = &tls.Config{
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GetCertificate: s.onGetCertificate,
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MinVersion: tls.VersionTLS12,
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}
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}
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upstream.RootCAs = s.conf.TLSv12Roots
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upstream.CipherSuites = s.conf.TLSCiphers
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return nil
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}
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// Called by 'tls' package when Client Hello is received
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// If the server name (from SNI) supplied by client is incorrect - we terminate the ongoing TLS handshake.
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func (s *Server) onGetCertificate(ch *tls.ClientHelloInfo) (*tls.Certificate, error) {
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if s.conf.StrictSNICheck && !matchDNSName(s.conf.dnsNames, ch.ServerName) {
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log.Info("DNS: TLS: unknown SNI in Client Hello: %s", ch.ServerName)
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return nil, fmt.Errorf("invalid SNI")
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}
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return &s.conf.cert, nil
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}
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File diff suppressed because it is too large
Load Diff
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@ -51,7 +51,7 @@ func (s *Server) handleGetConfig(w http.ResponseWriter, r *http.Request) {
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resp.EDNSCSEnabled = s.conf.EnableEDNSClientSubnet
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resp.DNSSECEnabled = s.conf.EnableDNSSEC
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resp.DisableIPv6 = s.conf.AAAADisabled
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resp.FastestAddr = s.conf.FastestAddrAlgo
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resp.FastestAddr = s.conf.FastestAddr
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resp.ParallelRequests = s.conf.AllServers
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s.RUnlock()
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@ -170,7 +170,7 @@ func (s *Server) handleSetConfig(w http.ResponseWriter, r *http.Request) {
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}
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if js.Exists("fastest_addr") {
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s.conf.FastestAddrAlgo = req.FastestAddr
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s.conf.FastestAddr = req.FastestAddr
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}
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if js.Exists("parallel_requests") {
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@ -0,0 +1,150 @@
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package dnsforward
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import (
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"strings"
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"github.com/AdguardTeam/AdGuardHome/dnsfilter"
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"github.com/AdguardTeam/dnsproxy/proxy"
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"github.com/AdguardTeam/golibs/log"
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"github.com/joomcode/errorx"
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"github.com/miekg/dns"
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)
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func (s *Server) beforeRequestHandler(p *proxy.Proxy, d *proxy.DNSContext) (bool, error) {
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ip := ipFromAddr(d.Addr)
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if s.access.IsBlockedIP(ip) {
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log.Tracef("Client IP %s is blocked by settings", ip)
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return false, nil
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}
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if len(d.Req.Question) == 1 {
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host := strings.TrimSuffix(d.Req.Question[0].Name, ".")
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if s.access.IsBlockedDomain(host) {
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log.Tracef("Domain %s is blocked by settings", host)
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return false, nil
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}
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}
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return true, nil
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}
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// getClientRequestFilteringSettings lookups client filtering settings
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// using the client's IP address from the DNSContext
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func (s *Server) getClientRequestFilteringSettings(d *proxy.DNSContext) *dnsfilter.RequestFilteringSettings {
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setts := s.dnsFilter.GetConfig()
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setts.FilteringEnabled = true
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if s.conf.FilterHandler != nil {
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clientAddr := ipFromAddr(d.Addr)
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s.conf.FilterHandler(clientAddr, &setts)
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}
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return &setts
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}
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// filterDNSRequest applies the dnsFilter and sets d.Res if the request was filtered
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func (s *Server) filterDNSRequest(ctx *dnsContext) (*dnsfilter.Result, error) {
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d := ctx.proxyCtx
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req := d.Req
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host := strings.TrimSuffix(req.Question[0].Name, ".")
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res, err := s.dnsFilter.CheckHost(host, d.Req.Question[0].Qtype, ctx.setts)
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if err != nil {
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// Return immediately if there's an error
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return nil, errorx.Decorate(err, "dnsfilter failed to check host '%s'", host)
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} else if res.IsFiltered {
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// log.Tracef("Host %s is filtered, reason - '%s', matched rule: '%s'", host, res.Reason, res.Rule)
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d.Res = s.genDNSFilterMessage(d, &res)
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} else if (res.Reason == dnsfilter.ReasonRewrite || res.Reason == dnsfilter.RewriteEtcHosts) &&
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len(res.IPList) != 0 {
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resp := s.makeResponse(req)
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name := host
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if len(res.CanonName) != 0 {
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resp.Answer = append(resp.Answer, s.genCNAMEAnswer(req, res.CanonName))
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name = res.CanonName
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}
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for _, ip := range res.IPList {
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ip4 := ip.To4()
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if req.Question[0].Qtype == dns.TypeA && ip4 != nil {
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a := s.genAAnswer(req, ip4)
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a.Hdr.Name = dns.Fqdn(name)
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resp.Answer = append(resp.Answer, a)
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} else if req.Question[0].Qtype == dns.TypeAAAA && ip4 == nil {
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a := s.genAAAAAnswer(req, ip)
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a.Hdr.Name = dns.Fqdn(name)
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resp.Answer = append(resp.Answer, a)
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}
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}
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d.Res = resp
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} else if res.Reason == dnsfilter.ReasonRewrite && len(res.CanonName) != 0 {
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ctx.origQuestion = d.Req.Question[0]
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// resolve canonical name, not the original host name
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d.Req.Question[0].Name = dns.Fqdn(res.CanonName)
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} else if res.Reason == dnsfilter.RewriteEtcHosts && len(res.ReverseHost) != 0 {
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resp := s.makeResponse(req)
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ptr := &dns.PTR{}
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ptr.Hdr = dns.RR_Header{
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Name: req.Question[0].Name,
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Rrtype: dns.TypePTR,
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Ttl: s.conf.BlockedResponseTTL,
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Class: dns.ClassINET,
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}
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ptr.Ptr = res.ReverseHost
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resp.Answer = append(resp.Answer, ptr)
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d.Res = resp
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}
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return &res, err
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}
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// If response contains CNAME, A or AAAA records, we apply filtering to each canonical host name or IP address.
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// If this is a match, we set a new response in d.Res and return.
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func (s *Server) filterDNSResponse(ctx *dnsContext) (*dnsfilter.Result, error) {
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d := ctx.proxyCtx
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for _, a := range d.Res.Answer {
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host := ""
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switch v := a.(type) {
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case *dns.CNAME:
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log.Debug("DNSFwd: Checking CNAME %s for %s", v.Target, v.Hdr.Name)
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host = strings.TrimSuffix(v.Target, ".")
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case *dns.A:
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host = v.A.String()
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log.Debug("DNSFwd: Checking record A (%s) for %s", host, v.Hdr.Name)
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case *dns.AAAA:
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host = v.AAAA.String()
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log.Debug("DNSFwd: Checking record AAAA (%s) for %s", host, v.Hdr.Name)
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default:
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continue
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}
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s.RLock()
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// Synchronize access to s.dnsFilter so it won't be suddenly uninitialized while in use.
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// This could happen after proxy server has been stopped, but its workers are not yet exited.
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if !s.conf.ProtectionEnabled || s.dnsFilter == nil {
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s.RUnlock()
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continue
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}
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res, err := s.dnsFilter.CheckHostRules(host, d.Req.Question[0].Qtype, ctx.setts)
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s.RUnlock()
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|
||||
if err != nil {
|
||||
return nil, err
|
||||
|
||||
} else if res.IsFiltered {
|
||||
d.Res = s.genDNSFilterMessage(d, &res)
|
||||
log.Debug("DNSFwd: Matched %s by response: %s", d.Req.Question[0].Name, host)
|
||||
return &res, nil
|
||||
}
|
||||
}
|
||||
|
||||
return nil, nil
|
||||
}
|
||||
|
|
@ -0,0 +1,247 @@
|
|||
package dnsforward
|
||||
|
||||
import (
|
||||
"time"
|
||||
|
||||
"github.com/AdguardTeam/AdGuardHome/dnsfilter"
|
||||
"github.com/AdguardTeam/dnsproxy/proxy"
|
||||
"github.com/AdguardTeam/golibs/log"
|
||||
"github.com/miekg/dns"
|
||||
)
|
||||
|
||||
// To transfer information between modules
|
||||
type dnsContext struct {
|
||||
srv *Server
|
||||
proxyCtx *proxy.DNSContext
|
||||
setts *dnsfilter.RequestFilteringSettings // filtering settings for this client
|
||||
startTime time.Time
|
||||
result *dnsfilter.Result
|
||||
origResp *dns.Msg // response received from upstream servers. Set when response is modified by filtering
|
||||
origQuestion dns.Question // question received from client. Set when Rewrites are used.
|
||||
err error // error returned from the module
|
||||
protectionEnabled bool // filtering is enabled, dnsfilter object is ready
|
||||
responseFromUpstream bool // response is received from upstream servers
|
||||
origReqDNSSEC bool // DNSSEC flag in the original request from user
|
||||
}
|
||||
|
||||
const (
|
||||
resultDone = iota // module has completed its job, continue
|
||||
resultFinish // module has completed its job, exit normally
|
||||
resultError // an error occurred, exit with an error
|
||||
)
|
||||
|
||||
// handleDNSRequest filters the incoming DNS requests and writes them to the query log
|
||||
func (s *Server) handleDNSRequest(p *proxy.Proxy, d *proxy.DNSContext) error {
|
||||
ctx := &dnsContext{srv: s, proxyCtx: d}
|
||||
ctx.result = &dnsfilter.Result{}
|
||||
ctx.startTime = time.Now()
|
||||
|
||||
type modProcessFunc func(ctx *dnsContext) int
|
||||
mods := []modProcessFunc{
|
||||
processInitial,
|
||||
processFilteringBeforeRequest,
|
||||
processUpstream,
|
||||
processDNSSECAfterResponse,
|
||||
processFilteringAfterResponse,
|
||||
processQueryLogsAndStats,
|
||||
}
|
||||
for _, process := range mods {
|
||||
r := process(ctx)
|
||||
switch r {
|
||||
case resultDone:
|
||||
// continue: call the next filter
|
||||
|
||||
case resultFinish:
|
||||
return nil
|
||||
|
||||
case resultError:
|
||||
return ctx.err
|
||||
}
|
||||
}
|
||||
|
||||
if d.Res != nil {
|
||||
d.Res.Compress = true // some devices require DNS message compression
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
// Perform initial checks; process WHOIS & rDNS
|
||||
func processInitial(ctx *dnsContext) int {
|
||||
s := ctx.srv
|
||||
d := ctx.proxyCtx
|
||||
if s.conf.AAAADisabled && d.Req.Question[0].Qtype == dns.TypeAAAA {
|
||||
_ = proxy.CheckDisabledAAAARequest(d, true)
|
||||
return resultFinish
|
||||
}
|
||||
|
||||
if s.conf.OnDNSRequest != nil {
|
||||
s.conf.OnDNSRequest(d)
|
||||
}
|
||||
|
||||
// disable Mozilla DoH
|
||||
if (d.Req.Question[0].Qtype == dns.TypeA || d.Req.Question[0].Qtype == dns.TypeAAAA) &&
|
||||
d.Req.Question[0].Name == "use-application-dns.net." {
|
||||
d.Res = s.genNXDomain(d.Req)
|
||||
return resultFinish
|
||||
}
|
||||
|
||||
return resultDone
|
||||
}
|
||||
|
||||
// Apply filtering logic
|
||||
func processFilteringBeforeRequest(ctx *dnsContext) int {
|
||||
s := ctx.srv
|
||||
d := ctx.proxyCtx
|
||||
|
||||
s.RLock()
|
||||
// Synchronize access to s.dnsFilter so it won't be suddenly uninitialized while in use.
|
||||
// This could happen after proxy server has been stopped, but its workers are not yet exited.
|
||||
//
|
||||
// A better approach is for proxy.Stop() to wait until all its workers exit,
|
||||
// but this would require the Upstream interface to have Close() function
|
||||
// (to prevent from hanging while waiting for unresponsive DNS server to respond).
|
||||
|
||||
var err error
|
||||
ctx.protectionEnabled = s.conf.ProtectionEnabled && s.dnsFilter != nil
|
||||
if ctx.protectionEnabled {
|
||||
ctx.setts = s.getClientRequestFilteringSettings(d)
|
||||
ctx.result, err = s.filterDNSRequest(ctx)
|
||||
}
|
||||
s.RUnlock()
|
||||
|
||||
if err != nil {
|
||||
ctx.err = err
|
||||
return resultError
|
||||
}
|
||||
return resultDone
|
||||
}
|
||||
|
||||
// Pass request to upstream servers; process the response
|
||||
func processUpstream(ctx *dnsContext) int {
|
||||
s := ctx.srv
|
||||
d := ctx.proxyCtx
|
||||
if d.Res != nil {
|
||||
return resultDone // response is already set - nothing to do
|
||||
}
|
||||
|
||||
if d.Addr != nil && s.conf.GetUpstreamsByClient != nil {
|
||||
clientIP := ipFromAddr(d.Addr)
|
||||
upstreams := s.conf.GetUpstreamsByClient(clientIP)
|
||||
if len(upstreams) > 0 {
|
||||
log.Debug("Using custom upstreams for %s", clientIP)
|
||||
d.Upstreams = upstreams
|
||||
}
|
||||
}
|
||||
|
||||
if s.conf.EnableDNSSEC {
|
||||
opt := d.Req.IsEdns0()
|
||||
if opt == nil {
|
||||
log.Debug("DNS: Adding OPT record with DNSSEC flag")
|
||||
d.Req.SetEdns0(4096, true)
|
||||
} else if !opt.Do() {
|
||||
opt.SetDo(true)
|
||||
} else {
|
||||
ctx.origReqDNSSEC = true
|
||||
}
|
||||
}
|
||||
|
||||
// request was not filtered so let it be processed further
|
||||
err := s.dnsProxy.Resolve(d)
|
||||
if err != nil {
|
||||
ctx.err = err
|
||||
return resultError
|
||||
}
|
||||
|
||||
ctx.responseFromUpstream = true
|
||||
return resultDone
|
||||
}
|
||||
|
||||
// Process DNSSEC after response from upstream server
|
||||
func processDNSSECAfterResponse(ctx *dnsContext) int {
|
||||
d := ctx.proxyCtx
|
||||
|
||||
if !ctx.responseFromUpstream || // don't process response if it's not from upstream servers
|
||||
!ctx.srv.conf.EnableDNSSEC {
|
||||
return resultDone
|
||||
}
|
||||
|
||||
optResp := d.Res.IsEdns0()
|
||||
if !ctx.origReqDNSSEC && optResp != nil && optResp.Do() {
|
||||
return resultDone
|
||||
}
|
||||
|
||||
// Remove RRSIG records from response
|
||||
// because there is no DO flag in the original request from client,
|
||||
// but we have EnableDNSSEC set, so we have set DO flag ourselves,
|
||||
// and now we have to clean up the DNS records our client didn't ask for.
|
||||
|
||||
answers := []dns.RR{}
|
||||
for _, a := range d.Res.Answer {
|
||||
switch a.(type) {
|
||||
case *dns.RRSIG:
|
||||
log.Debug("Removing RRSIG record from response: %v", a)
|
||||
default:
|
||||
answers = append(answers, a)
|
||||
}
|
||||
}
|
||||
d.Res.Answer = answers
|
||||
|
||||
answers = []dns.RR{}
|
||||
for _, a := range d.Res.Ns {
|
||||
switch a.(type) {
|
||||
case *dns.RRSIG:
|
||||
log.Debug("Removing RRSIG record from response: %v", a)
|
||||
default:
|
||||
answers = append(answers, a)
|
||||
}
|
||||
}
|
||||
d.Res.Ns = answers
|
||||
|
||||
return resultDone
|
||||
}
|
||||
|
||||
// Apply filtering logic after we have received response from upstream servers
|
||||
func processFilteringAfterResponse(ctx *dnsContext) int {
|
||||
s := ctx.srv
|
||||
d := ctx.proxyCtx
|
||||
res := ctx.result
|
||||
var err error
|
||||
|
||||
switch res.Reason {
|
||||
case dnsfilter.ReasonRewrite:
|
||||
if len(res.CanonName) == 0 {
|
||||
break
|
||||
}
|
||||
d.Req.Question[0] = ctx.origQuestion
|
||||
d.Res.Question[0] = ctx.origQuestion
|
||||
|
||||
if len(d.Res.Answer) != 0 {
|
||||
answer := []dns.RR{}
|
||||
answer = append(answer, s.genCNAMEAnswer(d.Req, res.CanonName))
|
||||
answer = append(answer, d.Res.Answer...) // host -> IP
|
||||
d.Res.Answer = answer
|
||||
}
|
||||
|
||||
case dnsfilter.NotFilteredWhiteList:
|
||||
// nothing
|
||||
|
||||
default:
|
||||
if !ctx.protectionEnabled || // filters are disabled: there's nothing to check for
|
||||
!ctx.responseFromUpstream { // only check response if it's from an upstream server
|
||||
break
|
||||
}
|
||||
origResp2 := d.Res
|
||||
ctx.result, err = s.filterDNSResponse(ctx)
|
||||
if err != nil {
|
||||
ctx.err = err
|
||||
return resultError
|
||||
}
|
||||
if ctx.result != nil {
|
||||
ctx.origResp = origResp2 // matched by response
|
||||
} else {
|
||||
ctx.result = &dnsfilter.Result{}
|
||||
}
|
||||
}
|
||||
|
||||
return resultDone
|
||||
}
|
||||
|
|
@ -0,0 +1,225 @@
|
|||
package dnsforward
|
||||
|
||||
import (
|
||||
"log"
|
||||
"net"
|
||||
"time"
|
||||
|
||||
"github.com/AdguardTeam/AdGuardHome/dnsfilter"
|
||||
"github.com/AdguardTeam/dnsproxy/proxy"
|
||||
"github.com/miekg/dns"
|
||||
)
|
||||
|
||||
// Create a DNS response by DNS request and set necessary flags
|
||||
func (s *Server) makeResponse(req *dns.Msg) *dns.Msg {
|
||||
resp := dns.Msg{}
|
||||
resp.SetReply(req)
|
||||
resp.RecursionAvailable = true
|
||||
resp.Compress = true
|
||||
return &resp
|
||||
}
|
||||
|
||||
// genDNSFilterMessage generates a DNS message corresponding to the filtering result
|
||||
func (s *Server) genDNSFilterMessage(d *proxy.DNSContext, result *dnsfilter.Result) *dns.Msg {
|
||||
m := d.Req
|
||||
|
||||
if m.Question[0].Qtype != dns.TypeA && m.Question[0].Qtype != dns.TypeAAAA {
|
||||
return s.genNXDomain(m)
|
||||
}
|
||||
|
||||
switch result.Reason {
|
||||
case dnsfilter.FilteredSafeBrowsing:
|
||||
return s.genBlockedHost(m, s.conf.SafeBrowsingBlockHost, d)
|
||||
case dnsfilter.FilteredParental:
|
||||
return s.genBlockedHost(m, s.conf.ParentalBlockHost, d)
|
||||
default:
|
||||
// If the query was filtered by "Safe search", dnsfilter also must return
|
||||
// the IP address that must be used in response.
|
||||
// In this case regardless of the filtering method, we should return it
|
||||
if result.Reason == dnsfilter.FilteredSafeSearch && result.IP != nil {
|
||||
return s.genResponseWithIP(m, result.IP)
|
||||
}
|
||||
|
||||
if s.conf.BlockingMode == "null_ip" {
|
||||
// it means that we should return 0.0.0.0 or :: for any blocked request
|
||||
|
||||
switch m.Question[0].Qtype {
|
||||
case dns.TypeA:
|
||||
return s.genARecord(m, []byte{0, 0, 0, 0})
|
||||
case dns.TypeAAAA:
|
||||
return s.genAAAARecord(m, net.IPv6zero)
|
||||
}
|
||||
|
||||
} else if s.conf.BlockingMode == "custom_ip" {
|
||||
// means that we should return custom IP for any blocked request
|
||||
|
||||
switch m.Question[0].Qtype {
|
||||
case dns.TypeA:
|
||||
return s.genARecord(m, s.conf.BlockingIPAddrv4)
|
||||
case dns.TypeAAAA:
|
||||
return s.genAAAARecord(m, s.conf.BlockingIPAddrv6)
|
||||
}
|
||||
|
||||
} else if s.conf.BlockingMode == "nxdomain" {
|
||||
// means that we should return NXDOMAIN for any blocked request
|
||||
|
||||
return s.genNXDomain(m)
|
||||
}
|
||||
|
||||
// Default blocking mode
|
||||
// If there's an IP specified in the rule, return it
|
||||
// If there is no IP, return NXDOMAIN
|
||||
if result.IP != nil {
|
||||
return s.genResponseWithIP(m, result.IP)
|
||||
}
|
||||
return s.genNXDomain(m)
|
||||
}
|
||||
}
|
||||
|
||||
func (s *Server) genServerFailure(request *dns.Msg) *dns.Msg {
|
||||
resp := dns.Msg{}
|
||||
resp.SetRcode(request, dns.RcodeServerFailure)
|
||||
resp.RecursionAvailable = true
|
||||
return &resp
|
||||
}
|
||||
|
||||
func (s *Server) genARecord(request *dns.Msg, ip net.IP) *dns.Msg {
|
||||
resp := s.makeResponse(request)
|
||||
resp.Answer = append(resp.Answer, s.genAAnswer(request, ip))
|
||||
return resp
|
||||
}
|
||||
|
||||
func (s *Server) genAAAARecord(request *dns.Msg, ip net.IP) *dns.Msg {
|
||||
resp := s.makeResponse(request)
|
||||
resp.Answer = append(resp.Answer, s.genAAAAAnswer(request, ip))
|
||||
return resp
|
||||
}
|
||||
|
||||
func (s *Server) genAAnswer(req *dns.Msg, ip net.IP) *dns.A {
|
||||
answer := new(dns.A)
|
||||
answer.Hdr = dns.RR_Header{
|
||||
Name: req.Question[0].Name,
|
||||
Rrtype: dns.TypeA,
|
||||
Ttl: s.conf.BlockedResponseTTL,
|
||||
Class: dns.ClassINET,
|
||||
}
|
||||
answer.A = ip
|
||||
return answer
|
||||
}
|
||||
|
||||
func (s *Server) genAAAAAnswer(req *dns.Msg, ip net.IP) *dns.AAAA {
|
||||
answer := new(dns.AAAA)
|
||||
answer.Hdr = dns.RR_Header{
|
||||
Name: req.Question[0].Name,
|
||||
Rrtype: dns.TypeAAAA,
|
||||
Ttl: s.conf.BlockedResponseTTL,
|
||||
Class: dns.ClassINET,
|
||||
}
|
||||
answer.AAAA = ip
|
||||
return answer
|
||||
}
|
||||
|
||||
// generate DNS response message with an IP address
|
||||
func (s *Server) genResponseWithIP(req *dns.Msg, ip net.IP) *dns.Msg {
|
||||
if req.Question[0].Qtype == dns.TypeA && ip.To4() != nil {
|
||||
return s.genARecord(req, ip.To4())
|
||||
} else if req.Question[0].Qtype == dns.TypeAAAA &&
|
||||
len(ip) == net.IPv6len && ip.To4() == nil {
|
||||
return s.genAAAARecord(req, ip)
|
||||
}
|
||||
|
||||
// empty response
|
||||
resp := s.makeResponse(req)
|
||||
return resp
|
||||
}
|
||||
|
||||
func (s *Server) genBlockedHost(request *dns.Msg, newAddr string, d *proxy.DNSContext) *dns.Msg {
|
||||
|
||||
ip := net.ParseIP(newAddr)
|
||||
if ip != nil {
|
||||
return s.genResponseWithIP(request, ip)
|
||||
}
|
||||
|
||||
// look up the hostname, TODO: cache
|
||||
replReq := dns.Msg{}
|
||||
replReq.SetQuestion(dns.Fqdn(newAddr), request.Question[0].Qtype)
|
||||
replReq.RecursionDesired = true
|
||||
|
||||
newContext := &proxy.DNSContext{
|
||||
Proto: d.Proto,
|
||||
Addr: d.Addr,
|
||||
StartTime: time.Now(),
|
||||
Req: &replReq,
|
||||
}
|
||||
|
||||
err := s.dnsProxy.Resolve(newContext)
|
||||
if err != nil {
|
||||
log.Printf("Couldn't look up replacement host '%s': %s", newAddr, err)
|
||||
return s.genServerFailure(request)
|
||||
}
|
||||
|
||||
resp := s.makeResponse(request)
|
||||
if newContext.Res != nil {
|
||||
for _, answer := range newContext.Res.Answer {
|
||||
answer.Header().Name = request.Question[0].Name
|
||||
resp.Answer = append(resp.Answer, answer)
|
||||
}
|
||||
}
|
||||
|
||||
return resp
|
||||
}
|
||||
|
||||
// Make a CNAME response
|
||||
func (s *Server) genCNAMEAnswer(req *dns.Msg, cname string) *dns.CNAME {
|
||||
answer := new(dns.CNAME)
|
||||
answer.Hdr = dns.RR_Header{
|
||||
Name: req.Question[0].Name,
|
||||
Rrtype: dns.TypeCNAME,
|
||||
Ttl: s.conf.BlockedResponseTTL,
|
||||
Class: dns.ClassINET,
|
||||
}
|
||||
answer.Target = dns.Fqdn(cname)
|
||||
return answer
|
||||
}
|
||||
|
||||
func (s *Server) genNXDomain(request *dns.Msg) *dns.Msg {
|
||||
resp := dns.Msg{}
|
||||
resp.SetRcode(request, dns.RcodeNameError)
|
||||
resp.RecursionAvailable = true
|
||||
resp.Ns = s.genSOA(request)
|
||||
return &resp
|
||||
}
|
||||
|
||||
func (s *Server) genSOA(request *dns.Msg) []dns.RR {
|
||||
zone := ""
|
||||
if len(request.Question) > 0 {
|
||||
zone = request.Question[0].Name
|
||||
}
|
||||
|
||||
soa := dns.SOA{
|
||||
// values copied from verisign's nonexistent .com domain
|
||||
// their exact values are not important in our use case because they are used for domain transfers between primary/secondary DNS servers
|
||||
Refresh: 1800,
|
||||
Retry: 900,
|
||||
Expire: 604800,
|
||||
Minttl: 86400,
|
||||
// copied from AdGuard DNS
|
||||
Ns: "fake-for-negative-caching.adguard.com.",
|
||||
Serial: 100500,
|
||||
// rest is request-specific
|
||||
Hdr: dns.RR_Header{
|
||||
Name: zone,
|
||||
Rrtype: dns.TypeSOA,
|
||||
Ttl: s.conf.BlockedResponseTTL,
|
||||
Class: dns.ClassINET,
|
||||
},
|
||||
Mbox: "hostmaster.", // zone will be appended later if it's not empty or "."
|
||||
}
|
||||
if soa.Hdr.Ttl == 0 {
|
||||
soa.Hdr.Ttl = defaultValues.BlockedResponseTTL
|
||||
}
|
||||
if len(zone) > 0 && zone[0] != '.' {
|
||||
soa.Mbox += zone
|
||||
}
|
||||
return []dns.RR{&soa}
|
||||
}
|
||||
|
|
@ -0,0 +1,91 @@
|
|||
package dnsforward
|
||||
|
||||
import (
|
||||
"net"
|
||||
"strings"
|
||||
"time"
|
||||
|
||||
"github.com/AdguardTeam/AdGuardHome/querylog"
|
||||
"github.com/miekg/dns"
|
||||
|
||||
"github.com/AdguardTeam/AdGuardHome/dnsfilter"
|
||||
"github.com/AdguardTeam/AdGuardHome/stats"
|
||||
"github.com/AdguardTeam/dnsproxy/proxy"
|
||||
)
|
||||
|
||||
// Write Stats data and logs
|
||||
func processQueryLogsAndStats(ctx *dnsContext) int {
|
||||
elapsed := time.Since(ctx.startTime)
|
||||
s := ctx.srv
|
||||
d := ctx.proxyCtx
|
||||
|
||||
shouldLog := true
|
||||
msg := d.Req
|
||||
|
||||
// don't log ANY request if refuseAny is enabled
|
||||
if len(msg.Question) >= 1 && msg.Question[0].Qtype == dns.TypeANY && s.conf.RefuseAny {
|
||||
shouldLog = false
|
||||
}
|
||||
|
||||
s.RLock()
|
||||
// Synchronize access to s.queryLog and s.stats so they won't be suddenly uninitialized while in use.
|
||||
// This can happen after proxy server has been stopped, but its workers haven't yet exited.
|
||||
if shouldLog && s.queryLog != nil {
|
||||
p := querylog.AddParams{
|
||||
Question: msg,
|
||||
Answer: d.Res,
|
||||
OrigAnswer: ctx.origResp,
|
||||
Result: ctx.result,
|
||||
Elapsed: elapsed,
|
||||
ClientIP: getIP(d.Addr),
|
||||
}
|
||||
if d.Upstream != nil {
|
||||
p.Upstream = d.Upstream.Address()
|
||||
}
|
||||
s.queryLog.Add(p)
|
||||
}
|
||||
|
||||
s.updateStats(d, elapsed, *ctx.result)
|
||||
s.RUnlock()
|
||||
|
||||
return resultDone
|
||||
}
|
||||
|
||||
func (s *Server) updateStats(d *proxy.DNSContext, elapsed time.Duration, res dnsfilter.Result) {
|
||||
if s.stats == nil {
|
||||
return
|
||||
}
|
||||
|
||||
e := stats.Entry{}
|
||||
e.Domain = strings.ToLower(d.Req.Question[0].Name)
|
||||
e.Domain = e.Domain[:len(e.Domain)-1] // remove last "."
|
||||
switch addr := d.Addr.(type) {
|
||||
case *net.UDPAddr:
|
||||
e.Client = addr.IP
|
||||
case *net.TCPAddr:
|
||||
e.Client = addr.IP
|
||||
}
|
||||
e.Time = uint32(elapsed / 1000)
|
||||
e.Result = stats.RNotFiltered
|
||||
|
||||
switch res.Reason {
|
||||
|
||||
case dnsfilter.FilteredSafeBrowsing:
|
||||
e.Result = stats.RSafeBrowsing
|
||||
|
||||
case dnsfilter.FilteredParental:
|
||||
e.Result = stats.RParental
|
||||
|
||||
case dnsfilter.FilteredSafeSearch:
|
||||
e.Result = stats.RSafeSearch
|
||||
|
||||
case dnsfilter.FilteredBlackList:
|
||||
fallthrough
|
||||
case dnsfilter.FilteredInvalid:
|
||||
fallthrough
|
||||
case dnsfilter.FilteredBlockedService:
|
||||
e.Result = stats.RFiltered
|
||||
}
|
||||
|
||||
s.stats.Update(e)
|
||||
}
|
||||
|
|
@ -0,0 +1,76 @@
|
|||
package dnsforward
|
||||
|
||||
import (
|
||||
"net"
|
||||
"sort"
|
||||
"strings"
|
||||
|
||||
"github.com/AdguardTeam/golibs/utils"
|
||||
)
|
||||
|
||||
func stringArrayDup(a []string) []string {
|
||||
a2 := make([]string, len(a))
|
||||
copy(a2, a)
|
||||
return a2
|
||||
}
|
||||
|
||||
// Get IP address from net.Addr object
|
||||
// Note: we can't use net.SplitHostPort(a.String()) because of IPv6 zone:
|
||||
// https://github.com/AdguardTeam/AdGuardHome/issues/1261
|
||||
func ipFromAddr(a net.Addr) string {
|
||||
switch addr := a.(type) {
|
||||
case *net.UDPAddr:
|
||||
return addr.IP.String()
|
||||
case *net.TCPAddr:
|
||||
return addr.IP.String()
|
||||
}
|
||||
return ""
|
||||
}
|
||||
|
||||
// Get IP address from net.Addr
|
||||
func getIP(addr net.Addr) net.IP {
|
||||
switch addr := addr.(type) {
|
||||
case *net.UDPAddr:
|
||||
return addr.IP
|
||||
case *net.TCPAddr:
|
||||
return addr.IP
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
// Find value in a sorted array
|
||||
func findSorted(ar []string, val string) int {
|
||||
i := sort.SearchStrings(ar, val)
|
||||
if i == len(ar) || ar[i] != val {
|
||||
return -1
|
||||
}
|
||||
return i
|
||||
}
|
||||
|
||||
func isWildcard(host string) bool {
|
||||
return len(host) >= 2 &&
|
||||
host[0] == '*' && host[1] == '.'
|
||||
}
|
||||
|
||||
// Return TRUE if host name matches a wildcard pattern
|
||||
func matchDomainWildcard(host, wildcard string) bool {
|
||||
return isWildcard(wildcard) &&
|
||||
strings.HasSuffix(host, wildcard[1:])
|
||||
}
|
||||
|
||||
// Return TRUE if client's SNI value matches DNS names from certificate
|
||||
func matchDNSName(dnsNames []string, sni string) bool {
|
||||
if utils.IsValidHostname(sni) != nil {
|
||||
return false
|
||||
}
|
||||
if findSorted(dnsNames, sni) != -1 {
|
||||
return true
|
||||
}
|
||||
|
||||
for _, dn := range dnsNames {
|
||||
if matchDomainWildcard(sni, dn) {
|
||||
return true
|
||||
}
|
||||
}
|
||||
return false
|
||||
}
|
||||
2
go.mod
2
go.mod
|
|
@ -3,7 +3,7 @@ module github.com/AdguardTeam/AdGuardHome
|
|||
go 1.14
|
||||
|
||||
require (
|
||||
github.com/AdguardTeam/dnsproxy v0.27.1
|
||||
github.com/AdguardTeam/dnsproxy v0.28.0
|
||||
github.com/AdguardTeam/golibs v0.4.2
|
||||
github.com/AdguardTeam/urlfilter v0.10.0
|
||||
github.com/NYTimes/gziphandler v1.1.1
|
||||
|
|
|
|||
4
go.sum
4
go.sum
|
|
@ -1,5 +1,5 @@
|
|||
github.com/AdguardTeam/dnsproxy v0.27.1 h1:CQ3vtGSNbHNeYkxC6pALwugTSssP2MnsjdxkvVMzEp4=
|
||||
github.com/AdguardTeam/dnsproxy v0.27.1/go.mod h1:hOYFV9TW+pd5XKYz7KZf2FFD8SvSPqjyGTxUae86s58=
|
||||
github.com/AdguardTeam/dnsproxy v0.28.0 h1:w6ITGjSMLztUOTVNVVcE0JU1bV2U0bOPyDHGwyZgTc4=
|
||||
github.com/AdguardTeam/dnsproxy v0.28.0/go.mod h1:hOYFV9TW+pd5XKYz7KZf2FFD8SvSPqjyGTxUae86s58=
|
||||
github.com/AdguardTeam/golibs v0.4.0 h1:4VX6LoOqFe9p9Gf55BeD8BvJD6M6RDYmgEiHrENE9KU=
|
||||
github.com/AdguardTeam/golibs v0.4.0/go.mod h1:skKsDKIBB7kkFflLJBpfGX+G8QFTx0WKUzB6TIgtUj4=
|
||||
github.com/AdguardTeam/golibs v0.4.2 h1:7M28oTZFoFwNmp8eGPb3ImmYbxGaJLyQXeIFVHjME0o=
|
||||
|
|
|
|||
Loading…
Reference in New Issue