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mobileconfig.go
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mobileconfig.go
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package home
import (
"encoding/json"
"fmt"
"net/http"
"net/url"
"path"
"github.com/AdguardTeam/AdGuardHome/internal/dnsforward"
"github.com/AdguardTeam/golibs/errors"
"github.com/AdguardTeam/golibs/log"
uuid "github.com/satori/go.uuid"
"howett.net/plist"
)
type dnsSettings struct {
DNSProtocol string
ServerURL string `plist:",omitempty"`
ServerName string `plist:",omitempty"`
clientID string
}
type payloadContent struct {
Name string
PayloadDescription string
PayloadDisplayName string
PayloadIdentifier string
PayloadType string
PayloadUUID string
DNSSettings dnsSettings
PayloadVersion int
}
type mobileConfig struct {
PayloadDescription string
PayloadDisplayName string
PayloadIdentifier string
PayloadType string
PayloadUUID string
PayloadContent []payloadContent
PayloadVersion int
PayloadRemovalDisallowed bool
}
func genUUIDv4() string {
return uuid.NewV4().String()
}
const (
dnsProtoHTTPS = "HTTPS"
dnsProtoTLS = "TLS"
)
func getMobileConfig(d dnsSettings) ([]byte, error) {
var dspName string
switch proto := d.DNSProtocol; proto {
case dnsProtoHTTPS:
dspName = fmt.Sprintf("%s DoH", d.ServerName)
u := &url.URL{
Scheme: schemeHTTPS,
Host: d.ServerName,
Path: path.Join("/dns-query", d.clientID),
}
d.ServerURL = u.String()
// Empty the ServerName field since it is only must be presented
// in DNS-over-TLS configuration.
//
// See https://developer.apple.com/documentation/devicemanagement/dnssettings/dnssettings.
d.ServerName = ""
case dnsProtoTLS:
dspName = fmt.Sprintf("%s DoT", d.ServerName)
if d.clientID != "" {
d.ServerName = d.clientID + "." + d.ServerName
}
default:
return nil, fmt.Errorf("bad dns protocol %q", proto)
}
data := mobileConfig{
PayloadContent: []payloadContent{{
Name: dspName,
PayloadDescription: "Configures device to use AdGuard Home",
PayloadDisplayName: dspName,
PayloadIdentifier: fmt.Sprintf("com.apple.dnsSettings.managed.%s", genUUIDv4()),
PayloadType: "com.apple.dnsSettings.managed",
PayloadUUID: genUUIDv4(),
PayloadVersion: 1,
DNSSettings: d,
}},
PayloadDescription: "Adds AdGuard Home to Big Sur and iOS 14 or newer systems",
PayloadDisplayName: dspName,
PayloadIdentifier: genUUIDv4(),
PayloadRemovalDisallowed: false,
PayloadType: "Configuration",
PayloadUUID: genUUIDv4(),
PayloadVersion: 1,
}
return plist.MarshalIndent(data, plist.XMLFormat, "\t")
}
func respondJSONError(w http.ResponseWriter, status int, msg string) {
w.WriteHeader(http.StatusInternalServerError)
err := json.NewEncoder(w).Encode(&jsonError{
Message: msg,
})
if err != nil {
log.Debug("writing %d json response: %s", status, err)
}
}
const errEmptyHost errors.Error = "no host in query parameters and no server_name"
func handleMobileConfig(w http.ResponseWriter, r *http.Request, dnsp string) {
var err error
q := r.URL.Query()
host := q.Get("host")
if host == "" {
respondJSONError(w, http.StatusInternalServerError, string(errEmptyHost))
return
}
clientID := q.Get("client_id")
if clientID != "" {
err = dnsforward.ValidateClientID(clientID)
if err != nil {
respondJSONError(w, http.StatusBadRequest, err.Error())
return
}
}
d := dnsSettings{
DNSProtocol: dnsp,
ServerName: host,
clientID: clientID,
}
mobileconfig, err := getMobileConfig(d)
if err != nil {
respondJSONError(w, http.StatusInternalServerError, err.Error())
return
}
w.Header().Set("Content-Type", "application/xml")
const (
dohContDisp = `attachment; filename=doh.mobileconfig`
dotContDisp = `attachment; filename=dot.mobileconfig`
)
contDisp := dohContDisp
if dnsp == dnsProtoTLS {
contDisp = dotContDisp
}
w.Header().Set("Content-Disposition", contDisp)
_, _ = w.Write(mobileconfig)
}
func handleMobileConfigDoH(w http.ResponseWriter, r *http.Request) {
handleMobileConfig(w, r, dnsProtoHTTPS)
}
func handleMobileConfigDoT(w http.ResponseWriter, r *http.Request) {
handleMobileConfig(w, r, dnsProtoTLS)
}