mirror of
https://github.com/AdguardTeam/AdGuardHome.git
synced 2024-11-17 02:48:28 -07:00
450 lines
13 KiB
Go
450 lines
13 KiB
Go
package home
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import (
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"encoding/json"
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"fmt"
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"net"
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"net/http"
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"strconv"
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"strings"
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"github.com/AdguardTeam/AdGuardHome/dnsforward"
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"github.com/AdguardTeam/dnsproxy/upstream"
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"github.com/AdguardTeam/golibs/log"
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"github.com/AdguardTeam/golibs/utils"
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"github.com/NYTimes/gziphandler"
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"github.com/miekg/dns"
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)
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var protocols = []string{"tls://", "https://", "tcp://", "sdns://"}
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// ----------------
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// helper functions
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// ----------------
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func returnOK(w http.ResponseWriter) {
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_, err := fmt.Fprintf(w, "OK\n")
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if err != nil {
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httpError(w, http.StatusInternalServerError, "Couldn't write body: %s", err)
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}
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}
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func httpError(w http.ResponseWriter, code int, format string, args ...interface{}) {
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text := fmt.Sprintf(format, args...)
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log.Info(text)
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http.Error(w, text, code)
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}
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// ---------------
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// dns run control
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// ---------------
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func writeAllConfigsAndReloadDNS() error {
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err := writeAllConfigs()
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if err != nil {
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log.Error("Couldn't write all configs: %s", err)
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return err
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}
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return reconfigureDNSServer()
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}
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func httpUpdateConfigReloadDNSReturnOK(w http.ResponseWriter, r *http.Request) {
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err := writeAllConfigsAndReloadDNS()
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if err != nil {
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httpError(w, http.StatusInternalServerError, "Couldn't write config file: %s", err)
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return
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}
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returnOK(w)
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}
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func addDNSAddress(dnsAddresses *[]string, addr string) {
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if config.DNS.Port != 53 {
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addr = fmt.Sprintf("%s:%d", addr, config.DNS.Port)
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}
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*dnsAddresses = append(*dnsAddresses, addr)
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}
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// Get the list of DNS addresses the server is listening on
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func getDNSAddresses() []string {
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dnsAddresses := []string{}
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if config.DNS.BindHost == "0.0.0.0" {
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ifaces, e := getValidNetInterfacesForWeb()
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if e != nil {
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log.Error("Couldn't get network interfaces: %v", e)
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return []string{}
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}
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for _, iface := range ifaces {
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for _, addr := range iface.Addresses {
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addDNSAddress(&dnsAddresses, addr)
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}
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}
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} else {
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addDNSAddress(&dnsAddresses, config.DNS.BindHost)
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}
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if config.TLS.Enabled && len(config.TLS.ServerName) != 0 {
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if config.TLS.PortHTTPS != 0 {
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addr := config.TLS.ServerName
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if config.TLS.PortHTTPS != 443 {
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addr = fmt.Sprintf("%s:%d", addr, config.TLS.PortHTTPS)
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}
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addr = fmt.Sprintf("https://%s/dns-query", addr)
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dnsAddresses = append(dnsAddresses, addr)
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}
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if config.TLS.PortDNSOverTLS != 0 {
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addr := fmt.Sprintf("tls://%s:%d", config.TLS.ServerName, config.TLS.PortDNSOverTLS)
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dnsAddresses = append(dnsAddresses, addr)
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}
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}
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return dnsAddresses
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}
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func handleStatus(w http.ResponseWriter, r *http.Request) {
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data := map[string]interface{}{
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"dns_addresses": getDNSAddresses(),
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"http_port": config.BindPort,
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"dns_port": config.DNS.Port,
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"protection_enabled": config.DNS.ProtectionEnabled,
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"running": isRunning(),
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"bootstrap_dns": config.DNS.BootstrapDNS,
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"upstream_dns": config.DNS.UpstreamDNS,
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"all_servers": config.DNS.AllServers,
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"version": versionString,
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"language": config.Language,
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}
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jsonVal, err := json.Marshal(data)
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if err != nil {
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httpError(w, http.StatusInternalServerError, "Unable to marshal status json: %s", err)
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return
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}
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w.Header().Set("Content-Type", "application/json")
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_, err = w.Write(jsonVal)
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if err != nil {
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httpError(w, http.StatusInternalServerError, "Unable to write response json: %s", err)
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return
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}
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}
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func handleProtectionEnable(w http.ResponseWriter, r *http.Request) {
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config.DNS.ProtectionEnabled = true
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httpUpdateConfigReloadDNSReturnOK(w, r)
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}
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func handleProtectionDisable(w http.ResponseWriter, r *http.Request) {
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config.DNS.ProtectionEnabled = false
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httpUpdateConfigReloadDNSReturnOK(w, r)
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}
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// -----------------------
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// upstreams configuration
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// -----------------------
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// TODO this struct will become unnecessary after config file rework
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type upstreamConfig struct {
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Upstreams []string `json:"upstream_dns"` // Upstreams
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BootstrapDNS []string `json:"bootstrap_dns"` // Bootstrap DNS
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AllServers bool `json:"all_servers"` // --all-servers param for dnsproxy
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}
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func handleSetUpstreamConfig(w http.ResponseWriter, r *http.Request) {
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newconfig := upstreamConfig{}
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err := json.NewDecoder(r.Body).Decode(&newconfig)
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if err != nil {
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httpError(w, http.StatusBadRequest, "Failed to parse new upstreams config json: %s", err)
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return
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}
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err = validateUpstreams(newconfig.Upstreams)
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if err != nil {
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httpError(w, http.StatusBadRequest, "wrong upstreams specification: %s", err)
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return
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}
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config.DNS.UpstreamDNS = defaultDNS
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if len(newconfig.Upstreams) > 0 {
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config.DNS.UpstreamDNS = newconfig.Upstreams
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}
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// bootstrap servers are plain DNS only.
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for _, host := range newconfig.BootstrapDNS {
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if err := checkPlainDNS(host); err != nil {
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httpError(w, http.StatusBadRequest, "%s can not be used as bootstrap dns cause: %s", host, err)
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return
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}
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}
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config.DNS.BootstrapDNS = defaultBootstrap
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if len(newconfig.BootstrapDNS) > 0 {
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config.DNS.BootstrapDNS = newconfig.BootstrapDNS
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}
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config.DNS.AllServers = newconfig.AllServers
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httpUpdateConfigReloadDNSReturnOK(w, r)
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}
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// validateUpstreams validates each upstream and returns an error if any upstream is invalid or if there are no default upstreams specified
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func validateUpstreams(upstreams []string) error {
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var defaultUpstreamFound bool
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for _, u := range upstreams {
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d, err := validateUpstream(u)
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if err != nil {
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return err
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}
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// Check this flag until default upstream will not be found
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if !defaultUpstreamFound {
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defaultUpstreamFound = d
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}
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}
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// Return error if there are no default upstreams
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if !defaultUpstreamFound {
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return fmt.Errorf("no default upstreams specified")
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}
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return nil
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}
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func validateUpstream(u string) (bool, error) {
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// Check if user tries to specify upstream for domain
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u, defaultUpstream, err := separateUpstream(u)
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if err != nil {
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return defaultUpstream, err
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}
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// The special server address '#' means "use the default servers"
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if u == "#" && !defaultUpstream {
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return defaultUpstream, nil
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}
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// Check if the upstream has a valid protocol prefix
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for _, proto := range protocols {
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if strings.HasPrefix(u, proto) {
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return defaultUpstream, nil
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}
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}
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// Return error if the upstream contains '://' without any valid protocol
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if strings.Contains(u, "://") {
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return defaultUpstream, fmt.Errorf("wrong protocol")
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}
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// Check if upstream is valid plain DNS
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return defaultUpstream, checkPlainDNS(u)
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}
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// separateUpstream returns upstream without specified domains and a bool flag that indicates if no domains were specified
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// error will be returned if upstream per domain specification is invalid
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func separateUpstream(upstream string) (string, bool, error) {
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defaultUpstream := true
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if strings.HasPrefix(upstream, "[/") {
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defaultUpstream = false
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// split domains and upstream string
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domainsAndUpstream := strings.Split(strings.TrimPrefix(upstream, "[/"), "/]")
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if len(domainsAndUpstream) != 2 {
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return "", defaultUpstream, fmt.Errorf("wrong DNS upstream per domain specification: %s", upstream)
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}
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// split domains list and validate each one
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for _, host := range strings.Split(domainsAndUpstream[0], "/") {
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if host != "" {
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if err := utils.IsValidHostname(host); err != nil {
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return "", defaultUpstream, err
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}
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}
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}
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upstream = domainsAndUpstream[1]
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}
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return upstream, defaultUpstream, nil
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}
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// checkPlainDNS checks if host is plain DNS
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func checkPlainDNS(upstream string) error {
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// Check if host is ip without port
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if net.ParseIP(upstream) != nil {
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return nil
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}
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// Check if host is ip with port
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ip, port, err := net.SplitHostPort(upstream)
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if err != nil {
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return err
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}
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if net.ParseIP(ip) == nil {
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return fmt.Errorf("%s is not a valid IP", ip)
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}
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_, err = strconv.ParseInt(port, 0, 64)
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if err != nil {
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return fmt.Errorf("%s is not a valid port: %s", port, err)
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}
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return nil
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}
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func handleTestUpstreamDNS(w http.ResponseWriter, r *http.Request) {
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upstreamConfig := upstreamConfig{}
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err := json.NewDecoder(r.Body).Decode(&upstreamConfig)
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if err != nil {
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httpError(w, http.StatusBadRequest, "Failed to read request body: %s", err)
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return
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}
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if len(upstreamConfig.Upstreams) == 0 {
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httpError(w, http.StatusBadRequest, "No servers specified")
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return
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}
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result := map[string]string{}
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for _, host := range upstreamConfig.Upstreams {
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err = checkDNS(host, upstreamConfig.BootstrapDNS)
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if err != nil {
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log.Info("%v", err)
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result[host] = err.Error()
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} else {
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result[host] = "OK"
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}
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}
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jsonVal, err := json.Marshal(result)
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if err != nil {
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httpError(w, http.StatusInternalServerError, "Unable to marshal status json: %s", err)
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return
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}
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w.Header().Set("Content-Type", "application/json")
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_, err = w.Write(jsonVal)
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if err != nil {
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httpError(w, http.StatusInternalServerError, "Couldn't write body: %s", err)
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}
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}
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func checkDNS(input string, bootstrap []string) error {
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// separate upstream from domains list
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input, defaultUpstream, err := separateUpstream(input)
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if err != nil {
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return fmt.Errorf("wrong upstream format: %s", err)
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}
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// No need to check this entrance
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if input == "#" && !defaultUpstream {
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return nil
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}
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if _, err := validateUpstream(input); err != nil {
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return fmt.Errorf("wrong upstream format: %s", err)
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}
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if len(bootstrap) == 0 {
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bootstrap = defaultBootstrap
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}
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log.Debug("Checking if DNS %s works...", input)
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u, err := upstream.AddressToUpstream(input, upstream.Options{Bootstrap: bootstrap, Timeout: dnsforward.DefaultTimeout})
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if err != nil {
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return fmt.Errorf("failed to choose upstream for %s: %s", input, err)
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}
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req := dns.Msg{}
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req.Id = dns.Id()
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req.RecursionDesired = true
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req.Question = []dns.Question{
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{Name: "google-public-dns-a.google.com.", Qtype: dns.TypeA, Qclass: dns.ClassINET},
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}
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reply, err := u.Exchange(&req)
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if err != nil {
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return fmt.Errorf("couldn't communicate with DNS server %s: %s", input, err)
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}
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if len(reply.Answer) != 1 {
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return fmt.Errorf("DNS server %s returned wrong answer", input)
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}
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if t, ok := reply.Answer[0].(*dns.A); ok {
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if !net.IPv4(8, 8, 8, 8).Equal(t.A) {
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return fmt.Errorf("DNS server %s returned wrong answer: %v", input, t.A)
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}
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}
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log.Debug("DNS %s works OK", input)
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return nil
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}
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type profileJSON struct {
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Name string `json:"name"`
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}
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func handleGetProfile(w http.ResponseWriter, r *http.Request) {
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pj := profileJSON{}
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u := config.auth.GetCurrentUser(r)
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pj.Name = u.Name
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data, err := json.Marshal(pj)
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if err != nil {
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httpError(w, http.StatusInternalServerError, "json.Marshal: %s", err)
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return
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}
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_, _ = w.Write(data)
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}
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// --------------
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// DNS-over-HTTPS
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// --------------
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func handleDOH(w http.ResponseWriter, r *http.Request) {
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if r.TLS == nil {
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httpError(w, http.StatusNotFound, "Not Found")
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return
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}
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if !isRunning() {
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httpError(w, http.StatusInternalServerError, "DNS server is not running")
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return
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}
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config.dnsServer.ServeHTTP(w, r)
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}
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// ------------------------
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// registration of handlers
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// ------------------------
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func registerControlHandlers() {
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httpRegister(http.MethodGet, "/control/status", handleStatus)
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httpRegister(http.MethodPost, "/control/enable_protection", handleProtectionEnable)
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httpRegister(http.MethodPost, "/control/disable_protection", handleProtectionDisable)
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httpRegister(http.MethodPost, "/control/set_upstreams_config", handleSetUpstreamConfig)
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httpRegister(http.MethodPost, "/control/test_upstream_dns", handleTestUpstreamDNS)
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httpRegister(http.MethodPost, "/control/i18n/change_language", handleI18nChangeLanguage)
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httpRegister(http.MethodGet, "/control/i18n/current_language", handleI18nCurrentLanguage)
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http.HandleFunc("/control/version.json", postInstall(optionalAuth(handleGetVersionJSON)))
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httpRegister(http.MethodPost, "/control/update", handleUpdate)
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httpRegister(http.MethodGet, "/control/dhcp/status", handleDHCPStatus)
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httpRegister(http.MethodGet, "/control/dhcp/interfaces", handleDHCPInterfaces)
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httpRegister(http.MethodPost, "/control/dhcp/set_config", handleDHCPSetConfig)
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httpRegister(http.MethodPost, "/control/dhcp/find_active_dhcp", handleDHCPFindActiveServer)
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httpRegister(http.MethodPost, "/control/dhcp/add_static_lease", handleDHCPAddStaticLease)
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httpRegister(http.MethodPost, "/control/dhcp/remove_static_lease", handleDHCPRemoveStaticLease)
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httpRegister(http.MethodGet, "/control/access/list", handleAccessList)
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httpRegister(http.MethodPost, "/control/access/set", handleAccessSet)
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httpRegister("GET", "/control/profile", handleGetProfile)
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RegisterFilteringHandlers()
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RegisterTLSHandlers()
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RegisterClientsHandlers()
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RegisterBlockedServicesHandlers()
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RegisterAuthHandlers()
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http.HandleFunc("/dns-query", postInstall(handleDOH))
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}
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func httpRegister(method string, url string, handler func(http.ResponseWriter, *http.Request)) {
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http.Handle(url, postInstallHandler(optionalAuthHandler(gziphandler.GzipHandler(ensureHandler(method, handler)))))
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}
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