badguardhome/control.go

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2018-08-30 14:25:33 +00:00
package main
import (
"bytes"
"context"
"crypto"
"crypto/ecdsa"
"crypto/rsa"
"crypto/tls"
"crypto/x509"
"encoding/base64"
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"encoding/json"
"encoding/pem"
"errors"
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"fmt"
"io/ioutil"
"net"
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"net/http"
"os"
"reflect"
"sort"
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"strconv"
"strings"
"time"
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"github.com/AdguardTeam/AdGuardHome/dnsforward"
"github.com/AdguardTeam/dnsproxy/upstream"
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"github.com/AdguardTeam/golibs/log"
"github.com/joomcode/errorx"
"github.com/miekg/dns"
govalidator "gopkg.in/asaskevich/govalidator.v4"
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)
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
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var client = &http.Client{
Timeout: time.Second * 30,
}
// ----------------
// helper functions
// ----------------
func returnOK(w http.ResponseWriter) {
_, err := fmt.Fprintf(w, "OK\n")
if err != nil {
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httpError(w, http.StatusInternalServerError, "Couldn't write body: %s", err)
}
}
func httpError(w http.ResponseWriter, code int, format string, args ...interface{}) {
text := fmt.Sprintf(format, args...)
log.Info(text)
http.Error(w, text, code)
}
// ---------------
// dns run control
// ---------------
func writeAllConfigsAndReloadDNS() error {
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err := writeAllConfigs()
if err != nil {
log.Error("Couldn't write all configs: %s", err)
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return err
}
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return reconfigureDNSServer()
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}
func httpUpdateConfigReloadDNSReturnOK(w http.ResponseWriter, r *http.Request) {
err := writeAllConfigsAndReloadDNS()
if err != nil {
httpError(w, http.StatusInternalServerError, "Couldn't write config file: %s", err)
return
}
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returnOK(w)
}
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func handleStatus(w http.ResponseWriter, r *http.Request) {
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log.Tracef("%s %v", r.Method, r.URL)
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data := map[string]interface{}{
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"dns_address": config.DNS.BindHost,
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"http_port": config.BindPort,
"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,
"all_servers": config.DNS.AllServers,
"version": VersionString,
"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
}
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
}
}
func handleProtectionEnable(w http.ResponseWriter, r *http.Request) {
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log.Tracef("%s %v", r.Method, r.URL)
config.DNS.ProtectionEnabled = true
httpUpdateConfigReloadDNSReturnOK(w, r)
}
func handleProtectionDisable(w http.ResponseWriter, r *http.Request) {
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log.Tracef("%s %v", r.Method, r.URL)
config.DNS.ProtectionEnabled = false
httpUpdateConfigReloadDNSReturnOK(w, r)
}
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// -----
// stats
// -----
func handleQueryLogEnable(w http.ResponseWriter, r *http.Request) {
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log.Tracef("%s %v", r.Method, r.URL)
config.DNS.QueryLogEnabled = true
httpUpdateConfigReloadDNSReturnOK(w, r)
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}
func handleQueryLogDisable(w http.ResponseWriter, r *http.Request) {
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log.Tracef("%s %v", r.Method, r.URL)
config.DNS.QueryLogEnabled = false
httpUpdateConfigReloadDNSReturnOK(w, r)
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}
func handleQueryLog(w http.ResponseWriter, r *http.Request) {
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log.Tracef("%s %v", r.Method, r.URL)
data := dnsServer.GetQueryLog()
jsonVal, err := json.Marshal(data)
if err != nil {
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httpError(w, http.StatusInternalServerError, "Couldn't marshal data into json: %s", err)
return
}
w.Header().Set("Content-Type", "application/json")
_, err = w.Write(jsonVal)
if err != nil {
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httpError(w, http.StatusInternalServerError, "Unable to write response json: %s", err)
}
}
func handleStatsTop(w http.ResponseWriter, r *http.Request) {
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log.Tracef("%s %v", r.Method, r.URL)
s := dnsServer.GetStatsTop()
// use manual json marshalling because we want maps to be sorted by value
statsJSON := bytes.Buffer{}
statsJSON.WriteString("{\n")
gen := func(json *bytes.Buffer, name string, top map[string]int, addComma bool) {
json.WriteString(" ")
json.WriteString(fmt.Sprintf("%q", name))
json.WriteString(": {\n")
sorted := sortByValue(top)
// no more than 50 entries
if len(sorted) > 50 {
sorted = sorted[:50]
}
for i, key := range sorted {
json.WriteString(" ")
json.WriteString(fmt.Sprintf("%q", key))
json.WriteString(": ")
json.WriteString(strconv.Itoa(top[key]))
if i+1 != len(sorted) {
json.WriteByte(',')
}
json.WriteByte('\n')
}
json.WriteString(" }")
if addComma {
json.WriteByte(',')
}
json.WriteByte('\n')
}
gen(&statsJSON, "top_queried_domains", s.Domains, true)
gen(&statsJSON, "top_blocked_domains", s.Blocked, true)
gen(&statsJSON, "top_clients", s.Clients, true)
statsJSON.WriteString(" \"stats_period\": \"24 hours\"\n")
statsJSON.WriteString("}\n")
w.Header().Set("Content-Type", "application/json")
_, err := w.Write(statsJSON.Bytes())
if err != nil {
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httpError(w, http.StatusInternalServerError, "Couldn't write body: %s", err)
}
}
// handleStatsReset resets the stats caches
func handleStatsReset(w http.ResponseWriter, r *http.Request) {
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log.Tracef("%s %v", r.Method, r.URL)
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dnsServer.PurgeStats()
_, err := fmt.Fprintf(w, "OK\n")
if err != nil {
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httpError(w, http.StatusInternalServerError, "Couldn't write body: %s", err)
}
}
// handleStats returns aggregated stats data for the 24 hours
func handleStats(w http.ResponseWriter, r *http.Request) {
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log.Tracef("%s %v", r.Method, r.URL)
summed := dnsServer.GetAggregatedStats()
statsJSON, err := json.Marshal(summed)
if err != nil {
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httpError(w, http.StatusInternalServerError, "Unable to marshal status json: %s", err)
return
}
w.Header().Set("Content-Type", "application/json")
_, err = w.Write(statsJSON)
if err != nil {
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httpError(w, http.StatusInternalServerError, "Unable to write response json: %s", err)
return
}
}
// HandleStatsHistory returns historical stats data for the 24 hours
func handleStatsHistory(w http.ResponseWriter, r *http.Request) {
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log.Tracef("%s %v", r.Method, r.URL)
// handle time unit and prepare our time window size
timeUnitString := r.URL.Query().Get("time_unit")
var timeUnit time.Duration
switch timeUnitString {
case "seconds":
timeUnit = time.Second
case "minutes":
timeUnit = time.Minute
case "hours":
timeUnit = time.Hour
case "days":
timeUnit = time.Hour * 24
default:
http.Error(w, "Must specify valid time_unit parameter", http.StatusBadRequest)
return
}
// parse start and end time
startTime, err := time.Parse(time.RFC3339, r.URL.Query().Get("start_time"))
if err != nil {
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httpError(w, http.StatusBadRequest, "Must specify valid start_time parameter: %s", err)
return
}
endTime, err := time.Parse(time.RFC3339, r.URL.Query().Get("end_time"))
if err != nil {
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httpError(w, http.StatusBadRequest, "Must specify valid end_time parameter: %s", err)
return
}
data, err := dnsServer.GetStatsHistory(timeUnit, startTime, endTime)
if err != nil {
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httpError(w, http.StatusBadRequest, "Cannot get stats history: %s", err)
return
}
statsJSON, err := json.Marshal(data)
if err != nil {
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httpError(w, http.StatusInternalServerError, "Unable to marshal status json: %s", err)
return
}
w.Header().Set("Content-Type", "application/json")
_, err = w.Write(statsJSON)
if err != nil {
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httpError(w, http.StatusInternalServerError, "Unable to write response json: %s", err)
return
}
}
// sortByValue is a helper function for querylog API
func sortByValue(m map[string]int) []string {
type kv struct {
k string
v int
}
var ss []kv
for k, v := range m {
ss = append(ss, kv{k, v})
}
sort.Slice(ss, func(l, r int) bool {
return ss[l].v > ss[r].v
})
sorted := []string{}
for _, v := range ss {
sorted = append(sorted, v.k)
}
return sorted
}
// -----------------------
// upstreams configuration
// -----------------------
// TODO this struct will become unnecessary after config file rework
type upstreamConfig struct {
Upstreams []string `json:"upstream_dns"` // Upstreams
BootstrapDNS []string `json:"bootstrap_dns"` // Bootstrap DNS
AllServers bool `json:"all_servers"` // --all-servers param for dnsproxy
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}
func handleSetUpstreamConfig(w http.ResponseWriter, r *http.Request) {
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log.Tracef("%s %v", r.Method, r.URL)
newconfig := upstreamConfig{}
err := json.NewDecoder(r.Body).Decode(&newconfig)
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if err != nil {
httpError(w, http.StatusBadRequest, "Failed to parse new upstreams config json: %s", err)
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return
}
config.DNS.UpstreamDNS = defaultDNS
if len(newconfig.Upstreams) > 0 {
config.DNS.UpstreamDNS = newconfig.Upstreams
}
// bootstrap servers are plain DNS only. We should return http error if there are tls:// https:// or sdns:// hosts in slice
for _, host := range newconfig.BootstrapDNS {
err := checkBootstrapDNS(host)
if err != nil {
httpError(w, http.StatusBadRequest, "%s can not be used as bootstrap dns cause: %s", host, err)
return
}
}
config.DNS.BootstrapDNS = defaultBootstrap
if len(newconfig.BootstrapDNS) > 0 {
config.DNS.BootstrapDNS = newconfig.BootstrapDNS
}
config.DNS.AllServers = newconfig.AllServers
httpUpdateConfigReloadDNSReturnOK(w, r)
}
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// checkBootstrapDNS checks if host is plain DNS
func checkBootstrapDNS(host string) error {
// Check if host is ip without port
if net.ParseIP(host) != nil {
return nil
}
// Check if host is ip with port
_, _, err := net.SplitHostPort(host)
return err
}
func handleTestUpstreamDNS(w http.ResponseWriter, r *http.Request) {
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log.Tracef("%s %v", r.Method, r.URL)
upstreamConfig := upstreamConfig{}
err := json.NewDecoder(r.Body).Decode(&upstreamConfig)
if err != nil {
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httpError(w, http.StatusBadRequest, "Failed to read request body: %s", err)
return
}
if len(upstreamConfig.Upstreams) == 0 {
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httpError(w, http.StatusBadRequest, "No servers specified")
return
}
result := map[string]string{}
for _, host := range upstreamConfig.Upstreams {
err = checkDNS(host, upstreamConfig.BootstrapDNS)
if err != nil {
log.Info("%v", err)
result[host] = err.Error()
} else {
result[host] = "OK"
}
}
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jsonVal, err := json.Marshal(result)
if err != nil {
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httpError(w, http.StatusInternalServerError, "Unable to marshal status json: %s", err)
return
}
w.Header().Set("Content-Type", "application/json")
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_, err = w.Write(jsonVal)
if err != nil {
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httpError(w, http.StatusInternalServerError, "Couldn't write body: %s", err)
}
}
func checkDNS(input string, bootstrap []string) error {
if len(bootstrap) == 0 {
bootstrap = defaultBootstrap
}
log.Debug("Checking if DNS %s works...", input)
u, err := upstream.AddressToUpstream(input, upstream.Options{Bootstrap: bootstrap, Timeout: dnsforward.DefaultTimeout})
if err != nil {
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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.Debug("DNS %s works OK", input)
return nil
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}
func handleGetVersionJSON(w http.ResponseWriter, r *http.Request) {
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log.Tracef("%s %v", r.Method, r.URL)
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 {
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httpError(w, http.StatusBadGateway, "Couldn't get version check json from %s: %T %s\n", versionCheckURL, err, err)
return
}
if resp != nil && resp.Body != nil {
defer resp.Body.Close()
}
// read the body entirely
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
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httpError(w, http.StatusBadGateway, "Couldn't read response body from %s: %s", versionCheckURL, err)
return
}
w.Header().Set("Content-Type", "application/json")
_, err = w.Write(body)
if err != nil {
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httpError(w, http.StatusInternalServerError, "Couldn't write body: %s", err)
}
versionCheckLastTime = now
versionCheckJSON = body
}
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// ---------
// filtering
// ---------
func handleFilteringEnable(w http.ResponseWriter, r *http.Request) {
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log.Tracef("%s %v", r.Method, r.URL)
config.DNS.FilteringEnabled = true
httpUpdateConfigReloadDNSReturnOK(w, r)
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}
func handleFilteringDisable(w http.ResponseWriter, r *http.Request) {
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log.Tracef("%s %v", r.Method, r.URL)
config.DNS.FilteringEnabled = false
httpUpdateConfigReloadDNSReturnOK(w, r)
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}
func handleFilteringStatus(w http.ResponseWriter, r *http.Request) {
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log.Tracef("%s %v", r.Method, r.URL)
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data := map[string]interface{}{
"enabled": config.DNS.FilteringEnabled,
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}
config.RLock()
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data["filters"] = config.Filters
data["user_rules"] = config.UserRules
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jsonVal, err := json.Marshal(data)
config.RUnlock()
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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
}
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
}
}
func handleFilteringAddURL(w http.ResponseWriter, r *http.Request) {
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log.Tracef("%s %v", r.Method, r.URL)
f := filter{}
err := json.NewDecoder(r.Body).Decode(&f)
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if err != nil {
httpError(w, http.StatusBadRequest, "Failed to parse request body json: %s", err)
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return
}
if len(f.URL) == 0 {
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http.Error(w, "URL parameter was not specified", http.StatusBadRequest)
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return
}
if valid := govalidator.IsRequestURL(f.URL); !valid {
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http.Error(w, "URL parameter is not valid request URL", http.StatusBadRequest)
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return
}
// Check for duplicates
for i := range config.Filters {
if config.Filters[i].URL == f.URL {
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httpError(w, http.StatusBadRequest, "Filter URL already added -- %s", f.URL)
return
}
}
// Set necessary properties
f.ID = assignUniqueFilterID()
f.Enabled = true
// Download the filter contents
ok, err := f.update(true)
if err != nil {
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httpError(w, http.StatusBadRequest, "Couldn't fetch filter from url %s: %s", f.URL, err)
return
}
if f.RulesCount == 0 {
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httpError(w, http.StatusBadRequest, "Filter at the url %s has no rules (maybe it points to blank page?)", f.URL)
return
}
if !ok {
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httpError(w, http.StatusBadRequest, "Filter at the url %s is invalid (maybe it points to blank page?)", f.URL)
return
}
// Save the filter contents
err = f.save()
if err != nil {
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httpError(w, http.StatusBadRequest, "Failed to save filter %d due to %s", f.ID, err)
return
}
// URL is deemed valid, append it to filters, update config, write new filter file and tell dns to reload it
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// TODO: since we directly feed filters in-memory, revisit if writing configs is always necessary
config.Filters = append(config.Filters, f)
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err = writeAllConfigs()
if err != nil {
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httpError(w, http.StatusInternalServerError, "Couldn't write config file: %s", err)
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return
}
err = reconfigureDNSServer()
if err != nil {
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httpError(w, http.StatusInternalServerError, "Couldn't reconfigure the DNS server: %s", err)
}
_, err = fmt.Fprintf(w, "OK %d rules\n", f.RulesCount)
if err != nil {
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httpError(w, http.StatusInternalServerError, "Couldn't write body: %s", err)
}
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}
func handleFilteringRemoveURL(w http.ResponseWriter, r *http.Request) {
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log.Tracef("%s %v", r.Method, r.URL)
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parameters, err := parseParametersFromBody(r.Body)
if err != nil {
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httpError(w, http.StatusBadRequest, "failed to parse parameters from body: %s", err)
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return
}
url, ok := parameters["url"]
if !ok {
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http.Error(w, "URL parameter was not specified", http.StatusBadRequest)
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return
}
if valid := govalidator.IsRequestURL(url); !valid {
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http.Error(w, "URL parameter is not valid request URL", http.StatusBadRequest)
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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())
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if err != nil && !os.IsNotExist(err) {
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httpError(w, http.StatusInternalServerError, "Couldn't remove the filter file: %s", err)
return
}
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}
}
// Update the configuration after removing filter files
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config.Filters = newFilters
httpUpdateConfigReloadDNSReturnOK(w, r)
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}
func handleFilteringEnableURL(w http.ResponseWriter, r *http.Request) {
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log.Tracef("%s %v", r.Method, r.URL)
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parameters, err := parseParametersFromBody(r.Body)
if err != nil {
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httpError(w, http.StatusBadRequest, "failed to parse parameters from body: %s", err)
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return
}
url, ok := parameters["url"]
if !ok {
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http.Error(w, "URL parameter was not specified", http.StatusBadRequest)
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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
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refreshFiltersIfNecessary(false)
httpUpdateConfigReloadDNSReturnOK(w, r)
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}
func handleFilteringDisableURL(w http.ResponseWriter, r *http.Request) {
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log.Tracef("%s %v", r.Method, r.URL)
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parameters, err := parseParametersFromBody(r.Body)
if err != nil {
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httpError(w, http.StatusBadRequest, "failed to parse parameters from body: %s", err)
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return
}
url, ok := parameters["url"]
if !ok {
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http.Error(w, "URL parameter was not specified", http.StatusBadRequest)
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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)
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}
func handleFilteringSetRules(w http.ResponseWriter, r *http.Request) {
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log.Tracef("%s %v", r.Method, r.URL)
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body, err := ioutil.ReadAll(r.Body)
if err != nil {
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httpError(w, http.StatusBadRequest, "Failed to read request body: %s", err)
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return
}
config.UserRules = strings.Split(string(body), "\n")
httpUpdateConfigReloadDNSReturnOK(w, r)
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}
func handleFilteringRefresh(w http.ResponseWriter, r *http.Request) {
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log.Tracef("%s %v", r.Method, r.URL)
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force := r.URL.Query().Get("force")
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updated := refreshFiltersIfNecessary(force != "")
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fmt.Fprintf(w, "OK %d filters updated\n", updated)
}
// ------------
// safebrowsing
// ------------
func handleSafeBrowsingEnable(w http.ResponseWriter, r *http.Request) {
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log.Tracef("%s %v", r.Method, r.URL)
config.DNS.SafeBrowsingEnabled = true
httpUpdateConfigReloadDNSReturnOK(w, r)
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}
func handleSafeBrowsingDisable(w http.ResponseWriter, r *http.Request) {
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log.Tracef("%s %v", r.Method, r.URL)
config.DNS.SafeBrowsingEnabled = false
httpUpdateConfigReloadDNSReturnOK(w, r)
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}
func handleSafeBrowsingStatus(w http.ResponseWriter, r *http.Request) {
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log.Tracef("%s %v", r.Method, r.URL)
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data := map[string]interface{}{
"enabled": config.DNS.SafeBrowsingEnabled,
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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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}
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
}
}
// --------
// parental
// --------
func handleParentalEnable(w http.ResponseWriter, r *http.Request) {
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log.Tracef("%s %v", r.Method, r.URL)
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parameters, err := parseParametersFromBody(r.Body)
if err != nil {
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httpError(w, http.StatusBadRequest, "failed to parse parameters from body: %s", err)
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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)
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}
func handleParentalDisable(w http.ResponseWriter, r *http.Request) {
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log.Tracef("%s %v", r.Method, r.URL)
config.DNS.ParentalEnabled = false
httpUpdateConfigReloadDNSReturnOK(w, r)
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}
func handleParentalStatus(w http.ResponseWriter, r *http.Request) {
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log.Tracef("%s %v", r.Method, r.URL)
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data := map[string]interface{}{
"enabled": config.DNS.ParentalEnabled,
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}
if config.DNS.ParentalEnabled {
data["sensitivity"] = config.DNS.ParentalSensitivity
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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
}
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
}
}
// ------------
// safebrowsing
// ------------
func handleSafeSearchEnable(w http.ResponseWriter, r *http.Request) {
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log.Tracef("%s %v", r.Method, r.URL)
config.DNS.SafeSearchEnabled = true
httpUpdateConfigReloadDNSReturnOK(w, r)
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}
func handleSafeSearchDisable(w http.ResponseWriter, r *http.Request) {
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log.Tracef("%s %v", r.Method, r.URL)
config.DNS.SafeSearchEnabled = false
httpUpdateConfigReloadDNSReturnOK(w, r)
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}
func handleSafeSearchStatus(w http.ResponseWriter, r *http.Request) {
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log.Tracef("%s %v", r.Method, r.URL)
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data := map[string]interface{}{
"enabled": config.DNS.SafeSearchEnabled,
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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
}
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
}
}
type ipport struct {
IP string `json:"ip,omitempty"`
Port int `json:"port"`
Warning string `json:"warning"`
}
type firstRunData struct {
Web ipport `json:"web"`
DNS ipport `json:"dns"`
Username string `json:"username,omitempty"`
Password string `json:"password,omitempty"`
Interfaces map[string]interface{} `json:"interfaces"`
}
func handleInstallGetAddresses(w http.ResponseWriter, r *http.Request) {
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log.Tracef("%s %v", r.Method, r.URL)
data := firstRunData{}
// find out if port 80 is available -- if not, fall back to 3000
if checkPortAvailable("", 80) == nil {
data.Web.Port = 80
} else {
data.Web.Port = 3000
}
// find out if port 53 is available -- if not, show a big warning
data.DNS.Port = 53
if checkPacketPortAvailable("", 53) != nil {
data.DNS.Warning = "Port 53 is not available for binding -- this will make DNS clients unable to contact AdGuard Home."
}
ifaces, err := getValidNetInterfacesForWeb()
if err != nil {
httpError(w, http.StatusInternalServerError, "Couldn't get interfaces: %s", err)
return
}
data.Interfaces = make(map[string]interface{})
for _, iface := range ifaces {
data.Interfaces[iface.Name] = iface
}
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w.Header().Set("Content-Type", "application/json")
err = json.NewEncoder(w).Encode(data)
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if err != nil {
httpError(w, http.StatusInternalServerError, "Unable to marshal default addresses to json: %s", err)
return
}
}
func handleInstallConfigure(w http.ResponseWriter, r *http.Request) {
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log.Tracef("%s %v", r.Method, r.URL)
newSettings := firstRunData{}
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err := json.NewDecoder(r.Body).Decode(&newSettings)
if err != nil {
httpError(w, http.StatusBadRequest, "Failed to parse new config json: %s", err)
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return
}
restartHTTP := true
if config.BindHost == newSettings.Web.IP && config.BindPort == newSettings.Web.Port {
// no need to rebind
restartHTTP = false
}
// validate that hosts and ports are bindable
if restartHTTP {
err = checkPortAvailable(newSettings.Web.IP, newSettings.Web.Port)
if err != nil {
httpError(w, http.StatusBadRequest, "Impossible to listen on IP:port %s due to %s", net.JoinHostPort(newSettings.Web.IP, strconv.Itoa(newSettings.Web.Port)), err)
return
}
}
err = checkPacketPortAvailable(newSettings.DNS.IP, newSettings.DNS.Port)
if err != nil {
httpError(w, http.StatusBadRequest, "Impossible to listen on IP:port %s due to %s", net.JoinHostPort(newSettings.DNS.IP, strconv.Itoa(newSettings.DNS.Port)), err)
return
}
config.firstRun = false
config.BindHost = newSettings.Web.IP
config.BindPort = newSettings.Web.Port
config.DNS.BindHost = newSettings.DNS.IP
config.DNS.Port = newSettings.DNS.Port
config.AuthName = newSettings.Username
config.AuthPass = newSettings.Password
if config.DNS.Port != 0 {
err = startDNSServer()
if err != nil {
httpError(w, http.StatusInternalServerError, "Couldn't start DNS server: %s", err)
return
}
}
httpUpdateConfigReloadDNSReturnOK(w, r)
// this needs to be done in a goroutine because Shutdown() is a blocking call, and it will block
// until all requests are finished, and _we_ are inside a request right now, so it will block indefinitely
if restartHTTP {
go func() {
httpServer.Shutdown(context.TODO())
}()
}
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}
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// ---
// TLS
// ---
func handleTLSStatus(w http.ResponseWriter, r *http.Request) {
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log.Tracef("%s %v", r.Method, r.URL)
marshalTLS(w, config.TLS)
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}
func handleTLSValidate(w http.ResponseWriter, r *http.Request) {
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log.Tracef("%s %v", r.Method, r.URL)
data, err := unmarshalTLS(r)
if err != nil {
httpError(w, http.StatusBadRequest, "Failed to unmarshal TLS config: %s", err)
return
}
// check if port is available
// BUT: if we are already using this port, no need
alreadyRunning := false
if httpsServer.server != nil {
alreadyRunning = true
}
if !alreadyRunning {
err = checkPortAvailable(config.BindHost, data.PortHTTPS)
if err != nil {
httpError(w, http.StatusBadRequest, "port %d is not available, cannot enable HTTPS on it", data.PortHTTPS)
return
}
}
data = validateCertificates(data)
marshalTLS(w, data)
}
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func handleTLSConfigure(w http.ResponseWriter, r *http.Request) {
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log.Tracef("%s %v", r.Method, r.URL)
data, err := unmarshalTLS(r)
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if err != nil {
httpError(w, http.StatusBadRequest, "Failed to unmarshal TLS config: %s", err)
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return
}
// check if port is available
// BUT: if we are already using this port, no need
alreadyRunning := false
if httpsServer.server != nil {
alreadyRunning = true
}
if !alreadyRunning {
err = checkPortAvailable(config.BindHost, data.PortHTTPS)
if err != nil {
httpError(w, http.StatusBadRequest, "port %d is not available, cannot enable HTTPS on it", data.PortHTTPS)
return
}
}
restartHTTPS := false
data = validateCertificates(data)
if !reflect.DeepEqual(config.TLS.tlsConfigSettings, data.tlsConfigSettings) {
log.Printf("tls config settings have changed, will restart HTTPS server")
restartHTTPS = true
}
config.TLS = data
err = writeAllConfigsAndReloadDNS()
if err != nil {
httpError(w, http.StatusInternalServerError, "Couldn't write config file: %s", err)
return
}
marshalTLS(w, data)
// this needs to be done in a goroutine because Shutdown() is a blocking call, and it will block
// until all requests are finished, and _we_ are inside a request right now, so it will block indefinitely
if restartHTTPS {
go func() {
time.Sleep(time.Second) // TODO: could not find a way to reliably know that data was fully sent to client by https server, so we wait a bit to let response through before closing the server
2019-02-21 16:07:12 +00:00
httpsServer.cond.L.Lock()
httpsServer.cond.Broadcast()
if httpsServer.server != nil {
httpsServer.server.Shutdown(context.TODO())
}
2019-02-21 16:07:12 +00:00
httpsServer.cond.L.Unlock()
}()
}
}
func validateCertificates(data tlsConfig) tlsConfig {
var err error
// clear out status for certificates
data.tlsConfigStatus = tlsConfigStatus{}
2019-02-21 14:33:46 +00:00
// check only public certificate separately from the key
if data.CertificateChain != "" {
log.Tracef("got certificate: %s", data.CertificateChain)
// now do a more extended validation
var certs []*pem.Block // PEM-encoded certificates
var skippedBytes []string // skipped bytes
pemblock := []byte(data.CertificateChain)
for {
var decoded *pem.Block
decoded, pemblock = pem.Decode(pemblock)
if decoded == nil {
break
}
if decoded.Type == "CERTIFICATE" {
certs = append(certs, decoded)
} else {
skippedBytes = append(skippedBytes, decoded.Type)
}
}
var parsedCerts []*x509.Certificate
for _, cert := range certs {
parsed, err := x509.ParseCertificate(cert.Bytes)
if err != nil {
data.WarningValidation = fmt.Sprintf("Failed to parse certificate: %s", err)
return data
}
parsedCerts = append(parsedCerts, parsed)
}
if len(parsedCerts) == 0 {
data.WarningValidation = fmt.Sprintf("You have specified an empty certificate")
return data
}
data.ValidCert = true
// spew.Dump(parsedCerts)
opts := x509.VerifyOptions{
DNSName: data.ServerName,
}
log.Printf("number of certs - %d", len(parsedCerts))
if len(parsedCerts) > 1 {
// set up an intermediate
pool := x509.NewCertPool()
for _, cert := range parsedCerts[1:] {
log.Printf("got an intermediate cert")
pool.AddCert(cert)
}
opts.Intermediates = pool
}
// TODO: save it as a warning rather than error it out -- shouldn't be a big problem
mainCert := parsedCerts[0]
_, err := mainCert.Verify(opts)
if err != nil {
// let self-signed certs through
data.WarningValidation = fmt.Sprintf("Your certificate does not verify: %s", err)
} else {
data.ValidChain = true
}
// spew.Dump(chains)
// update status
if mainCert != nil {
notAfter := mainCert.NotAfter
data.Subject = mainCert.Subject.String()
data.Issuer = mainCert.Issuer.String()
data.NotAfter = notAfter
data.NotBefore = mainCert.NotBefore
data.DNSNames = mainCert.DNSNames
}
}
// validate private key (right now the only validation possible is just parsing it)
if data.PrivateKey != "" {
// now do a more extended validation
var key *pem.Block // PEM-encoded certificates
var skippedBytes []string // skipped bytes
// go through all pem blocks, but take first valid pem block and drop the rest
pemblock := []byte(data.PrivateKey)
for {
var decoded *pem.Block
decoded, pemblock = pem.Decode(pemblock)
if decoded == nil {
break
}
if decoded.Type == "PRIVATE KEY" || strings.HasSuffix(decoded.Type, " PRIVATE KEY") {
key = decoded
break
} else {
skippedBytes = append(skippedBytes, decoded.Type)
}
}
if key == nil {
data.WarningValidation = "No valid keys were found"
return data
}
// parse the decoded key
_, keytype, err := parsePrivateKey(key.Bytes)
if err != nil {
data.WarningValidation = fmt.Sprintf("Failed to parse private key: %s", err)
return data
}
data.ValidKey = true
data.KeyType = keytype
}
// if both are set, validate both in unison
if data.PrivateKey != "" && data.CertificateChain != "" {
_, err = tls.X509KeyPair([]byte(data.CertificateChain), []byte(data.PrivateKey))
if err != nil {
data.WarningValidation = fmt.Sprintf("Invalid certificate or key: %s", err)
return data
}
data.usable = true
}
return data
2019-01-23 14:26:15 +00:00
}
// Attempt to parse the given private key DER block. OpenSSL 0.9.8 generates
// PKCS#1 private keys by default, while OpenSSL 1.0.0 generates PKCS#8 keys.
// OpenSSL ecparam generates SEC1 EC private keys for ECDSA. We try all three.
func parsePrivateKey(der []byte) (crypto.PrivateKey, string, error) {
if key, err := x509.ParsePKCS1PrivateKey(der); err == nil {
return key, "RSA", nil
}
if key, err := x509.ParsePKCS8PrivateKey(der); err == nil {
switch key := key.(type) {
case *rsa.PrivateKey:
return key, "RSA", nil
case *ecdsa.PrivateKey:
return key, "ECDSA", nil
default:
return nil, "", errors.New("tls: found unknown private key type in PKCS#8 wrapping")
}
}
if key, err := x509.ParseECPrivateKey(der); err == nil {
return key, "ECDSA", nil
}
return nil, "", errors.New("tls: failed to parse private key")
}
// unmarshalTLS handles base64-encoded certificates transparently
func unmarshalTLS(r *http.Request) (tlsConfig, error) {
data := tlsConfig{}
err := json.NewDecoder(r.Body).Decode(&data)
if err != nil {
return data, errorx.Decorate(err, "Failed to parse new TLS config json")
}
if data.CertificateChain != "" {
certPEM, err := base64.StdEncoding.DecodeString(data.CertificateChain)
if err != nil {
return data, errorx.Decorate(err, "Failed to base64-decode certificate chain")
}
data.CertificateChain = string(certPEM)
}
if data.PrivateKey != "" {
keyPEM, err := base64.StdEncoding.DecodeString(data.PrivateKey)
if err != nil {
return data, errorx.Decorate(err, "Failed to base64-decode private key")
}
data.PrivateKey = string(keyPEM)
}
return data, nil
}
func marshalTLS(w http.ResponseWriter, data tlsConfig) {
w.Header().Set("Content-Type", "application/json")
if data.CertificateChain != "" {
encoded := base64.StdEncoding.EncodeToString([]byte(data.CertificateChain))
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data.CertificateChain = encoded
}
if data.PrivateKey != "" {
encoded := base64.StdEncoding.EncodeToString([]byte(data.PrivateKey))
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data.PrivateKey = encoded
}
err := json.NewEncoder(w).Encode(data)
if err != nil {
httpError(w, http.StatusInternalServerError, "Failed to marshal json with TLS status: %s", err)
return
}
}
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// --------------
// DNS-over-HTTPS
// --------------
func handleDOH(w http.ResponseWriter, r *http.Request) {
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log.Tracef("%s %v", r.Method, r.URL)
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if r.TLS == nil {
httpError(w, http.StatusNotFound, "Not Found")
return
}
if !isRunning() {
httpError(w, http.StatusInternalServerError, "DNS server is not running")
return
}
dnsServer.ServeHTTP(w, r)
}
// ------------------------
// registration of handlers
// ------------------------
func registerInstallHandlers() {
http.HandleFunc("/control/install/get_addresses", preInstall(ensureGET(handleInstallGetAddresses)))
http.HandleFunc("/control/install/configure", preInstall(ensurePOST(handleInstallConfigure)))
}
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func registerControlHandlers() {
http.HandleFunc("/control/status", postInstall(optionalAuth(ensureGET(handleStatus))))
http.HandleFunc("/control/enable_protection", postInstall(optionalAuth(ensurePOST(handleProtectionEnable))))
http.HandleFunc("/control/disable_protection", postInstall(optionalAuth(ensurePOST(handleProtectionDisable))))
http.HandleFunc("/control/querylog", postInstall(optionalAuth(ensureGET(handleQueryLog))))
http.HandleFunc("/control/querylog_enable", postInstall(optionalAuth(ensurePOST(handleQueryLogEnable))))
http.HandleFunc("/control/querylog_disable", postInstall(optionalAuth(ensurePOST(handleQueryLogDisable))))
2019-02-28 08:10:43 +00:00
http.HandleFunc("/control/set_upstreams_config", postInstall(optionalAuth(ensurePOST(handleSetUpstreamConfig))))
http.HandleFunc("/control/test_upstream_dns", postInstall(optionalAuth(ensurePOST(handleTestUpstreamDNS))))
http.HandleFunc("/control/i18n/change_language", postInstall(optionalAuth(ensurePOST(handleI18nChangeLanguage))))
http.HandleFunc("/control/i18n/current_language", postInstall(optionalAuth(ensureGET(handleI18nCurrentLanguage))))
http.HandleFunc("/control/stats_top", postInstall(optionalAuth(ensureGET(handleStatsTop))))
http.HandleFunc("/control/stats", postInstall(optionalAuth(ensureGET(handleStats))))
http.HandleFunc("/control/stats_history", postInstall(optionalAuth(ensureGET(handleStatsHistory))))
http.HandleFunc("/control/stats_reset", postInstall(optionalAuth(ensurePOST(handleStatsReset))))
http.HandleFunc("/control/version.json", postInstall(optionalAuth(handleGetVersionJSON)))
http.HandleFunc("/control/filtering/enable", postInstall(optionalAuth(ensurePOST(handleFilteringEnable))))
http.HandleFunc("/control/filtering/disable", postInstall(optionalAuth(ensurePOST(handleFilteringDisable))))
http.HandleFunc("/control/filtering/add_url", postInstall(optionalAuth(ensurePUT(handleFilteringAddURL))))
http.HandleFunc("/control/filtering/remove_url", postInstall(optionalAuth(ensureDELETE(handleFilteringRemoveURL))))
http.HandleFunc("/control/filtering/enable_url", postInstall(optionalAuth(ensurePOST(handleFilteringEnableURL))))
http.HandleFunc("/control/filtering/disable_url", postInstall(optionalAuth(ensurePOST(handleFilteringDisableURL))))
http.HandleFunc("/control/filtering/refresh", postInstall(optionalAuth(ensurePOST(handleFilteringRefresh))))
http.HandleFunc("/control/filtering/status", postInstall(optionalAuth(ensureGET(handleFilteringStatus))))
http.HandleFunc("/control/filtering/set_rules", postInstall(optionalAuth(ensurePUT(handleFilteringSetRules))))
http.HandleFunc("/control/safebrowsing/enable", postInstall(optionalAuth(ensurePOST(handleSafeBrowsingEnable))))
http.HandleFunc("/control/safebrowsing/disable", postInstall(optionalAuth(ensurePOST(handleSafeBrowsingDisable))))
http.HandleFunc("/control/safebrowsing/status", postInstall(optionalAuth(ensureGET(handleSafeBrowsingStatus))))
http.HandleFunc("/control/parental/enable", postInstall(optionalAuth(ensurePOST(handleParentalEnable))))
http.HandleFunc("/control/parental/disable", postInstall(optionalAuth(ensurePOST(handleParentalDisable))))
http.HandleFunc("/control/parental/status", postInstall(optionalAuth(ensureGET(handleParentalStatus))))
http.HandleFunc("/control/safesearch/enable", postInstall(optionalAuth(ensurePOST(handleSafeSearchEnable))))
http.HandleFunc("/control/safesearch/disable", postInstall(optionalAuth(ensurePOST(handleSafeSearchDisable))))
http.HandleFunc("/control/safesearch/status", postInstall(optionalAuth(ensureGET(handleSafeSearchStatus))))
http.HandleFunc("/control/dhcp/status", postInstall(optionalAuth(ensureGET(handleDHCPStatus))))
http.HandleFunc("/control/dhcp/interfaces", postInstall(optionalAuth(ensureGET(handleDHCPInterfaces))))
http.HandleFunc("/control/dhcp/set_config", postInstall(optionalAuth(ensurePOST(handleDHCPSetConfig))))
http.HandleFunc("/control/dhcp/find_active_dhcp", postInstall(optionalAuth(ensurePOST(handleDHCPFindActiveServer))))
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http.HandleFunc("/control/tls/status", postInstall(optionalAuth(ensureGET(handleTLSStatus))))
http.HandleFunc("/control/tls/configure", postInstall(optionalAuth(ensurePOST(handleTLSConfigure))))
http.HandleFunc("/control/tls/validate", postInstall(optionalAuth(ensurePOST(handleTLSValidate))))
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http.HandleFunc("/dns-query", postInstall(handleDOH))
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}