badguardhome/control.go
2018-12-29 17:37:18 +03:00

725 lines
21 KiB
Go

package main
import (
"encoding/json"
"fmt"
"io/ioutil"
"net"
"net/http"
"os"
"strconv"
"strings"
"time"
"github.com/AdguardTeam/AdGuardHome/dnsforward"
"github.com/AdguardTeam/AdGuardHome/log"
"github.com/AdguardTeam/dnsproxy/upstream"
"github.com/miekg/dns"
"gopkg.in/asaskevich/govalidator.v4"
)
const updatePeriod = time.Minute * 30
// cached version.json to avoid hammering github.io for each page reload
var versionCheckJSON []byte
var versionCheckLastTime time.Time
const versionCheckURL = "https://adguardteam.github.io/AdGuardHome/version.json"
const versionCheckPeriod = time.Hour * 8
var client = &http.Client{
Timeout: time.Second * 30,
}
// -------------------
// dns run control
// -------------------
func writeAllConfigsAndReloadDNS() error {
err := writeAllConfigs()
if err != nil {
log.Printf("Couldn't write all configs: %s", err)
return err
}
reconfigureDNSServer()
return nil
}
func httpUpdateConfigReloadDNSReturnOK(w http.ResponseWriter, r *http.Request) {
err := writeAllConfigsAndReloadDNS()
if err != nil {
errortext := fmt.Sprintf("Couldn't write config file: %s", err)
log.Println(errortext)
http.Error(w, errortext, http.StatusInternalServerError)
return
}
returnOK(w, r)
}
func returnOK(w http.ResponseWriter, r *http.Request) {
_, err := fmt.Fprintf(w, "OK\n")
if err != nil {
errortext := fmt.Sprintf("Couldn't write body: %s", err)
log.Println(errortext)
http.Error(w, errortext, http.StatusInternalServerError)
}
}
func handleStatus(w http.ResponseWriter, r *http.Request) {
data := map[string]interface{}{
"dns_address": config.BindHost,
"dns_port": config.DNS.Port,
"protection_enabled": config.DNS.ProtectionEnabled,
"querylog_enabled": config.DNS.QueryLogEnabled,
"running": isRunning(),
"bootstrap_dns": config.DNS.BootstrapDNS,
"upstream_dns": config.DNS.UpstreamDNS,
"version": VersionString,
"language": config.Language,
}
jsonVal, err := json.Marshal(data)
if err != nil {
errortext := fmt.Sprintf("Unable to marshal status json: %s", err)
log.Println(errortext)
http.Error(w, errortext, 500)
return
}
w.Header().Set("Content-Type", "application/json")
_, err = w.Write(jsonVal)
if err != nil {
errortext := fmt.Sprintf("Unable to write response json: %s", err)
log.Println(errortext)
http.Error(w, errortext, 500)
return
}
}
func handleProtectionEnable(w http.ResponseWriter, r *http.Request) {
config.DNS.ProtectionEnabled = true
httpUpdateConfigReloadDNSReturnOK(w, r)
}
func handleProtectionDisable(w http.ResponseWriter, r *http.Request) {
config.DNS.ProtectionEnabled = false
httpUpdateConfigReloadDNSReturnOK(w, r)
}
// -----
// stats
// -----
func handleQueryLogEnable(w http.ResponseWriter, r *http.Request) {
config.DNS.QueryLogEnabled = true
httpUpdateConfigReloadDNSReturnOK(w, r)
}
func handleQueryLogDisable(w http.ResponseWriter, r *http.Request) {
config.DNS.QueryLogEnabled = false
httpUpdateConfigReloadDNSReturnOK(w, r)
}
func httpError(w http.ResponseWriter, code int, format string, args ...interface{}) {
text := fmt.Sprintf(format, args...)
log.Println(text)
http.Error(w, text, code)
}
func handleSetUpstreamDNS(w http.ResponseWriter, r *http.Request) {
body, err := ioutil.ReadAll(r.Body)
if err != nil {
errorText := fmt.Sprintf("Failed to read request body: %s", err)
log.Println(errorText)
http.Error(w, errorText, http.StatusBadRequest)
return
}
// if empty body -- user is asking for default servers
hosts := strings.Fields(string(body))
if len(hosts) == 0 {
config.DNS.UpstreamDNS = defaultDNS
} else {
config.DNS.UpstreamDNS = hosts
}
err = writeAllConfigs()
if err != nil {
errorText := fmt.Sprintf("Couldn't write config file: %s", err)
log.Println(errorText)
http.Error(w, errorText, http.StatusInternalServerError)
return
}
reconfigureDNSServer()
_, err = fmt.Fprintf(w, "OK %d servers\n", len(hosts))
if err != nil {
errorText := fmt.Sprintf("Couldn't write body: %s", err)
log.Println(errorText)
http.Error(w, errorText, http.StatusInternalServerError)
}
}
func handleTestUpstreamDNS(w http.ResponseWriter, r *http.Request) {
body, err := ioutil.ReadAll(r.Body)
if err != nil {
errorText := fmt.Sprintf("Failed to read request body: %s", err)
log.Println(errorText)
http.Error(w, errorText, 400)
return
}
hosts := strings.Fields(string(body))
if len(hosts) == 0 {
errorText := fmt.Sprintf("No servers specified")
log.Println(errorText)
http.Error(w, errorText, http.StatusBadRequest)
return
}
result := map[string]string{}
for _, host := range hosts {
err = checkDNS(host)
if err != nil {
log.Println(err)
result[host] = err.Error()
} else {
result[host] = "OK"
}
}
jsonVal, err := json.Marshal(result)
if err != nil {
errorText := fmt.Sprintf("Unable to marshal status json: %s", err)
log.Println(errorText)
http.Error(w, errorText, http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", "application/json")
_, err = w.Write(jsonVal)
if err != nil {
errorText := fmt.Sprintf("Couldn't write body: %s", err)
log.Println(errorText)
http.Error(w, errorText, http.StatusInternalServerError)
}
}
func checkDNS(input string) error {
log.Printf("Checking if DNS %s works...", input)
u, err := upstream.AddressToUpstream(input, "", dnsforward.DefaultTimeout)
if err != nil {
return fmt.Errorf("Failed to choose upstream for %s: %s", input, err)
}
req := dns.Msg{}
req.Id = dns.Id()
req.RecursionDesired = true
req.Question = []dns.Question{
{Name: "google-public-dns-a.google.com.", Qtype: dns.TypeA, Qclass: dns.ClassINET},
}
reply, err := u.Exchange(&req)
if err != nil {
return fmt.Errorf("couldn't communicate with DNS server %s: %s", input, err)
}
if len(reply.Answer) != 1 {
return fmt.Errorf("DNS server %s returned wrong answer", input)
}
if t, ok := reply.Answer[0].(*dns.A); ok {
if !net.IPv4(8, 8, 8, 8).Equal(t.A) {
return fmt.Errorf("DNS server %s returned wrong answer: %v", input, t.A)
}
}
log.Printf("DNS %s works OK", input)
return nil
}
func handleGetVersionJSON(w http.ResponseWriter, r *http.Request) {
now := time.Now()
if now.Sub(versionCheckLastTime) <= versionCheckPeriod && len(versionCheckJSON) != 0 {
// return cached copy
w.Header().Set("Content-Type", "application/json")
w.Write(versionCheckJSON)
return
}
resp, err := client.Get(versionCheckURL)
if err != nil {
errortext := fmt.Sprintf("Couldn't get version check json from %s: %T %s\n", versionCheckURL, err, err)
log.Println(errortext)
http.Error(w, errortext, http.StatusBadGateway)
return
}
if resp != nil && resp.Body != nil {
defer resp.Body.Close()
}
// read the body entirely
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
errortext := fmt.Sprintf("Couldn't read response body from %s: %s", versionCheckURL, err)
log.Println(errortext)
http.Error(w, errortext, http.StatusBadGateway)
return
}
w.Header().Set("Content-Type", "application/json")
_, err = w.Write(body)
if err != nil {
errortext := fmt.Sprintf("Couldn't write body: %s", err)
log.Println(errortext)
http.Error(w, errortext, http.StatusInternalServerError)
}
versionCheckLastTime = now
versionCheckJSON = body
}
// ---------
// filtering
// ---------
func handleFilteringEnable(w http.ResponseWriter, r *http.Request) {
config.DNS.FilteringEnabled = true
httpUpdateConfigReloadDNSReturnOK(w, r)
}
func handleFilteringDisable(w http.ResponseWriter, r *http.Request) {
config.DNS.FilteringEnabled = false
httpUpdateConfigReloadDNSReturnOK(w, r)
}
func handleFilteringStatus(w http.ResponseWriter, r *http.Request) {
data := map[string]interface{}{
"enabled": config.DNS.FilteringEnabled,
}
config.RLock()
data["filters"] = config.Filters
data["user_rules"] = config.UserRules
jsonVal, err := json.Marshal(data)
config.RUnlock()
if err != nil {
errortext := fmt.Sprintf("Unable to marshal status json: %s", err)
log.Println(errortext)
http.Error(w, errortext, 500)
return
}
w.Header().Set("Content-Type", "application/json")
_, err = w.Write(jsonVal)
if err != nil {
errortext := fmt.Sprintf("Unable to write response json: %s", err)
log.Println(errortext)
http.Error(w, errortext, 500)
return
}
}
func handleFilteringAddURL(w http.ResponseWriter, r *http.Request) {
filter := filter{}
err := json.NewDecoder(r.Body).Decode(&filter)
if err != nil {
httpError(w, http.StatusBadRequest, "Failed to parse request body json: %s", err)
return
}
if len(filter.URL) == 0 {
http.Error(w, "URL parameter was not specified", 400)
return
}
if valid := govalidator.IsRequestURL(filter.URL); !valid {
http.Error(w, "URL parameter is not valid request URL", 400)
return
}
// Check for duplicates
for i := range config.Filters {
if config.Filters[i].URL == filter.URL {
errorText := fmt.Sprintf("Filter URL already added -- %s", filter.URL)
log.Println(errorText)
http.Error(w, errorText, http.StatusBadRequest)
return
}
}
// Set necessary properties
filter.ID = assignUniqueFilterID()
filter.Enabled = true
// Download the filter contents
ok, err := filter.update(true)
if err != nil {
errorText := fmt.Sprintf("Couldn't fetch filter from url %s: %s", filter.URL, err)
log.Println(errorText)
http.Error(w, errorText, http.StatusBadRequest)
return
}
if filter.RulesCount == 0 {
errorText := fmt.Sprintf("Filter at the url %s has no rules (maybe it points to blank page?)", filter.URL)
log.Println(errorText)
http.Error(w, errorText, http.StatusBadRequest)
return
}
if !ok {
errorText := fmt.Sprintf("Filter at the url %s is invalid (maybe it points to blank page?)", filter.URL)
log.Println(errorText)
http.Error(w, errorText, http.StatusBadRequest)
return
}
// Save the filter contents
err = filter.save()
if err != nil {
errorText := fmt.Sprintf("Failed to save filter %d due to %s", filter.ID, err)
log.Println(errorText)
http.Error(w, errorText, http.StatusBadRequest)
return
}
// URL is deemed valid, append it to filters, update config, write new filter file and tell dns to reload it
// TODO: since we directly feed filters in-memory, revisit if writing configs is always neccessary
config.Filters = append(config.Filters, filter)
err = writeAllConfigs()
if err != nil {
errorText := fmt.Sprintf("Couldn't write config file: %s", err)
log.Println(errorText)
http.Error(w, errorText, http.StatusInternalServerError)
return
}
reconfigureDNSServer()
_, err = fmt.Fprintf(w, "OK %d rules\n", filter.RulesCount)
if err != nil {
errorText := fmt.Sprintf("Couldn't write body: %s", err)
log.Println(errorText)
http.Error(w, errorText, http.StatusInternalServerError)
}
}
func handleFilteringRemoveURL(w http.ResponseWriter, r *http.Request) {
parameters, err := parseParametersFromBody(r.Body)
if err != nil {
errorText := fmt.Sprintf("failed to parse parameters from body: %s", err)
log.Println(errorText)
http.Error(w, errorText, 400)
return
}
url, ok := parameters["url"]
if !ok {
http.Error(w, "URL parameter was not specified", 400)
return
}
if valid := govalidator.IsRequestURL(url); !valid {
http.Error(w, "URL parameter is not valid request URL", 400)
return
}
// go through each element and delete if url matches
newFilters := config.Filters[:0]
for _, filter := range config.Filters {
if filter.URL != url {
newFilters = append(newFilters, filter)
} else {
// Remove the filter file
err := os.Remove(filter.Path())
if err != nil {
errorText := fmt.Sprintf("Couldn't remove the filter file: %s", err)
http.Error(w, errorText, http.StatusInternalServerError)
return
}
}
}
// Update the configuration after removing filter files
config.Filters = newFilters
httpUpdateConfigReloadDNSReturnOK(w, r)
}
func handleFilteringEnableURL(w http.ResponseWriter, r *http.Request) {
parameters, err := parseParametersFromBody(r.Body)
if err != nil {
errorText := fmt.Sprintf("failed to parse parameters from body: %s", err)
log.Println(errorText)
http.Error(w, errorText, 400)
return
}
url, ok := parameters["url"]
if !ok {
http.Error(w, "URL parameter was not specified", 400)
return
}
if valid := govalidator.IsRequestURL(url); !valid {
http.Error(w, "URL parameter is not valid request URL", http.StatusBadRequest)
return
}
found := false
for i := range config.Filters {
filter := &config.Filters[i] // otherwise we will be operating on a copy
if filter.URL == url {
filter.Enabled = true
found = true
}
}
if !found {
http.Error(w, "URL parameter was not previously added", http.StatusBadRequest)
return
}
// kick off refresh of rules from new URLs
refreshFiltersIfNeccessary(false)
httpUpdateConfigReloadDNSReturnOK(w, r)
}
func handleFilteringDisableURL(w http.ResponseWriter, r *http.Request) {
parameters, err := parseParametersFromBody(r.Body)
if err != nil {
errorText := fmt.Sprintf("failed to parse parameters from body: %s", err)
log.Println(errorText)
http.Error(w, errorText, 400)
return
}
url, ok := parameters["url"]
if !ok {
http.Error(w, "URL parameter was not specified", 400)
return
}
if valid := govalidator.IsRequestURL(url); !valid {
http.Error(w, "URL parameter is not valid request URL", http.StatusBadRequest)
return
}
found := false
for i := range config.Filters {
filter := &config.Filters[i] // otherwise we will be operating on a copy
if filter.URL == url {
filter.Enabled = false
found = true
}
}
if !found {
http.Error(w, "URL parameter was not previously added", http.StatusBadRequest)
return
}
httpUpdateConfigReloadDNSReturnOK(w, r)
}
func handleFilteringSetRules(w http.ResponseWriter, r *http.Request) {
body, err := ioutil.ReadAll(r.Body)
if err != nil {
errorText := fmt.Sprintf("Failed to read request body: %s", err)
log.Println(errorText)
http.Error(w, errorText, 400)
return
}
config.UserRules = strings.Split(string(body), "\n")
httpUpdateConfigReloadDNSReturnOK(w, r)
}
func handleFilteringRefresh(w http.ResponseWriter, r *http.Request) {
force := r.URL.Query().Get("force")
updated := refreshFiltersIfNeccessary(force != "")
fmt.Fprintf(w, "OK %d filters updated\n", updated)
}
// ------------
// safebrowsing
// ------------
func handleSafeBrowsingEnable(w http.ResponseWriter, r *http.Request) {
config.DNS.SafeBrowsingEnabled = true
httpUpdateConfigReloadDNSReturnOK(w, r)
}
func handleSafeBrowsingDisable(w http.ResponseWriter, r *http.Request) {
config.DNS.SafeBrowsingEnabled = false
httpUpdateConfigReloadDNSReturnOK(w, r)
}
func handleSafeBrowsingStatus(w http.ResponseWriter, r *http.Request) {
data := map[string]interface{}{
"enabled": config.DNS.SafeBrowsingEnabled,
}
jsonVal, err := json.Marshal(data)
if err != nil {
errortext := fmt.Sprintf("Unable to marshal status json: %s", err)
log.Println(errortext)
http.Error(w, errortext, 500)
}
w.Header().Set("Content-Type", "application/json")
_, err = w.Write(jsonVal)
if err != nil {
errortext := fmt.Sprintf("Unable to write response json: %s", err)
log.Println(errortext)
http.Error(w, errortext, 500)
return
}
}
// --------
// parental
// --------
func handleParentalEnable(w http.ResponseWriter, r *http.Request) {
parameters, err := parseParametersFromBody(r.Body)
if err != nil {
errortext := fmt.Sprintf("failed to parse parameters from body: %s", err)
log.Println(errortext)
http.Error(w, errortext, 400)
return
}
sensitivity, ok := parameters["sensitivity"]
if !ok {
http.Error(w, "URL parameter was not specified", 400)
return
}
switch sensitivity {
case "3":
break
case "EARLY_CHILDHOOD":
sensitivity = "3"
case "10":
break
case "YOUNG":
sensitivity = "10"
case "13":
break
case "TEEN":
sensitivity = "13"
case "17":
break
case "MATURE":
sensitivity = "17"
default:
http.Error(w, "Sensitivity must be set to valid value", 400)
return
}
i, err := strconv.Atoi(sensitivity)
if err != nil {
http.Error(w, "Sensitivity must be set to valid value", 400)
return
}
config.DNS.ParentalSensitivity = i
config.DNS.ParentalEnabled = true
httpUpdateConfigReloadDNSReturnOK(w, r)
}
func handleParentalDisable(w http.ResponseWriter, r *http.Request) {
config.DNS.ParentalEnabled = false
httpUpdateConfigReloadDNSReturnOK(w, r)
}
func handleParentalStatus(w http.ResponseWriter, r *http.Request) {
data := map[string]interface{}{
"enabled": config.DNS.ParentalEnabled,
}
if config.DNS.ParentalEnabled {
data["sensitivity"] = config.DNS.ParentalSensitivity
}
jsonVal, err := json.Marshal(data)
if err != nil {
errortext := fmt.Sprintf("Unable to marshal status json: %s", err)
log.Println(errortext)
http.Error(w, errortext, 500)
return
}
w.Header().Set("Content-Type", "application/json")
_, err = w.Write(jsonVal)
if err != nil {
errortext := fmt.Sprintf("Unable to write response json: %s", err)
log.Println(errortext)
http.Error(w, errortext, 500)
return
}
}
// ------------
// safebrowsing
// ------------
func handleSafeSearchEnable(w http.ResponseWriter, r *http.Request) {
config.DNS.SafeSearchEnabled = true
httpUpdateConfigReloadDNSReturnOK(w, r)
}
func handleSafeSearchDisable(w http.ResponseWriter, r *http.Request) {
config.DNS.SafeSearchEnabled = false
httpUpdateConfigReloadDNSReturnOK(w, r)
}
func handleSafeSearchStatus(w http.ResponseWriter, r *http.Request) {
data := map[string]interface{}{
"enabled": config.DNS.SafeSearchEnabled,
}
jsonVal, err := json.Marshal(data)
if err != nil {
errortext := fmt.Sprintf("Unable to marshal status json: %s", err)
log.Println(errortext)
http.Error(w, errortext, 500)
return
}
w.Header().Set("Content-Type", "application/json")
_, err = w.Write(jsonVal)
if err != nil {
errortext := fmt.Sprintf("Unable to write response json: %s", err)
log.Println(errortext)
http.Error(w, errortext, 500)
return
}
}
func registerControlHandlers() {
http.HandleFunc("/control/status", optionalAuth(ensureGET(handleStatus)))
http.HandleFunc("/control/enable_protection", optionalAuth(ensurePOST(handleProtectionEnable)))
http.HandleFunc("/control/disable_protection", optionalAuth(ensurePOST(handleProtectionDisable)))
http.HandleFunc("/control/querylog", optionalAuth(ensureGET(dnsforward.HandleQueryLog)))
http.HandleFunc("/control/querylog_enable", optionalAuth(ensurePOST(handleQueryLogEnable)))
http.HandleFunc("/control/querylog_disable", optionalAuth(ensurePOST(handleQueryLogDisable)))
http.HandleFunc("/control/set_upstream_dns", optionalAuth(ensurePOST(handleSetUpstreamDNS)))
http.HandleFunc("/control/test_upstream_dns", optionalAuth(ensurePOST(handleTestUpstreamDNS)))
http.HandleFunc("/control/i18n/change_language", optionalAuth(ensurePOST(handleI18nChangeLanguage)))
http.HandleFunc("/control/i18n/current_language", optionalAuth(ensureGET(handleI18nCurrentLanguage)))
http.HandleFunc("/control/stats_top", optionalAuth(ensureGET(dnsforward.HandleStatsTop)))
http.HandleFunc("/control/stats", optionalAuth(ensureGET(dnsforward.HandleStats)))
http.HandleFunc("/control/stats_history", optionalAuth(ensureGET(dnsforward.HandleStatsHistory)))
http.HandleFunc("/control/stats_reset", optionalAuth(ensurePOST(dnsforward.HandleStatsReset)))
http.HandleFunc("/control/version.json", optionalAuth(handleGetVersionJSON))
http.HandleFunc("/control/filtering/enable", optionalAuth(ensurePOST(handleFilteringEnable)))
http.HandleFunc("/control/filtering/disable", optionalAuth(ensurePOST(handleFilteringDisable)))
http.HandleFunc("/control/filtering/add_url", optionalAuth(ensurePUT(handleFilteringAddURL)))
http.HandleFunc("/control/filtering/remove_url", optionalAuth(ensureDELETE(handleFilteringRemoveURL)))
http.HandleFunc("/control/filtering/enable_url", optionalAuth(ensurePOST(handleFilteringEnableURL)))
http.HandleFunc("/control/filtering/disable_url", optionalAuth(ensurePOST(handleFilteringDisableURL)))
http.HandleFunc("/control/filtering/refresh", optionalAuth(ensurePOST(handleFilteringRefresh)))
http.HandleFunc("/control/filtering/status", optionalAuth(ensureGET(handleFilteringStatus)))
http.HandleFunc("/control/filtering/set_rules", optionalAuth(ensurePUT(handleFilteringSetRules)))
http.HandleFunc("/control/safebrowsing/enable", optionalAuth(ensurePOST(handleSafeBrowsingEnable)))
http.HandleFunc("/control/safebrowsing/disable", optionalAuth(ensurePOST(handleSafeBrowsingDisable)))
http.HandleFunc("/control/safebrowsing/status", optionalAuth(ensureGET(handleSafeBrowsingStatus)))
http.HandleFunc("/control/parental/enable", optionalAuth(ensurePOST(handleParentalEnable)))
http.HandleFunc("/control/parental/disable", optionalAuth(ensurePOST(handleParentalDisable)))
http.HandleFunc("/control/parental/status", optionalAuth(ensureGET(handleParentalStatus)))
http.HandleFunc("/control/safesearch/enable", optionalAuth(ensurePOST(handleSafeSearchEnable)))
http.HandleFunc("/control/safesearch/disable", optionalAuth(ensurePOST(handleSafeSearchDisable)))
http.HandleFunc("/control/safesearch/status", optionalAuth(ensureGET(handleSafeSearchStatus)))
http.HandleFunc("/control/dhcp/status", optionalAuth(ensureGET(handleDHCPStatus)))
http.HandleFunc("/control/dhcp/interfaces", optionalAuth(ensureGET(handleDHCPInterfaces)))
http.HandleFunc("/control/dhcp/set_config", optionalAuth(ensurePOST(handleDHCPSetConfig)))
http.HandleFunc("/control/dhcp/find_active_dhcp", optionalAuth(ensurePOST(handleDHCPFindActiveServer)))
}