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|
/* SPDX-License-Identifier: MIT
*
* Copyright (C) 2019-2020 WireGuard LLC. All Rights Reserved.
*/
package updater
import (
"crypto/hmac"
"errors"
"fmt"
"hash"
"io"
"sync/atomic"
"golang.org/x/crypto/blake2b"
"golang.zx2c4.com/wireguard/windows/elevate"
"golang.zx2c4.com/wireguard/windows/updater/winhttp"
"golang.zx2c4.com/wireguard/windows/version"
)
type DownloadProgress struct {
Activity string
BytesDownloaded uint64
BytesTotal uint64
Error error
Complete bool
}
type progressHashWatcher struct {
dp *DownloadProgress
c chan DownloadProgress
hashState hash.Hash
}
func (pm *progressHashWatcher) Write(p []byte) (int, error) {
bytes := len(p)
pm.dp.BytesDownloaded += uint64(bytes)
pm.c <- *pm.dp
pm.hashState.Write(p)
return bytes, nil
}
type UpdateFound struct {
name string
hash [blake2b.Size256]byte
}
func CheckForUpdate() (updateFound *UpdateFound, err error) {
updateFound, _, _, err = checkForUpdate(false)
return
}
func checkForUpdate(keepSession bool) (*UpdateFound, *winhttp.Session, *winhttp.Connection, error) {
if !version.IsRunningOfficialVersion() {
return nil, nil, nil, errors.New("Build is not official, so updates are disabled")
}
session, err := winhttp.NewSession(version.UserAgent())
if err != nil {
return nil, nil, nil, err
}
defer func() {
if err != nil || !keepSession {
session.Close()
}
}()
connection, err := session.Connect(updateServerHost, updateServerPort, updateServerUseHttps)
if err != nil {
return nil, nil, nil, err
}
defer func() {
if err != nil || !keepSession {
connection.Close()
}
}()
response, err := connection.Get(latestVersionPath, true)
if err != nil {
return nil, nil, nil, err
}
defer response.Close()
var fileList [1024 * 512] /* 512 KiB */ byte
bytesRead, err := response.Read(fileList[:])
if err != nil && (err != io.EOF || bytesRead == 0) {
return nil, nil, nil, err
}
files, err := readFileList(fileList[:bytesRead])
if err != nil {
return nil, nil, nil, err
}
updateFound, err := findCandidate(files)
if err != nil {
return nil, nil, nil, err
}
if keepSession {
return updateFound, session, connection, nil
}
return updateFound, nil, nil, nil
}
var updateInProgress = uint32(0)
func DownloadVerifyAndExecute(userToken uintptr) (progress chan DownloadProgress) {
progress = make(chan DownloadProgress, 128)
progress <- DownloadProgress{Activity: "Initializing"}
if !atomic.CompareAndSwapUint32(&updateInProgress, 0, 1) {
progress <- DownloadProgress{Error: errors.New("An update is already in progress")}
return
}
doIt := func() {
defer atomic.StoreUint32(&updateInProgress, 0)
progress <- DownloadProgress{Activity: "Checking for update"}
update, session, connection, err := checkForUpdate(true)
if err != nil {
progress <- DownloadProgress{Error: err}
return
}
defer connection.Close()
defer session.Close()
if update == nil {
progress <- DownloadProgress{Error: errors.New("No update was found")}
return
}
progress <- DownloadProgress{Activity: "Creating temporary file"}
file, err := msiTempFile()
if err != nil {
progress <- DownloadProgress{Error: err}
return
}
progress <- DownloadProgress{Activity: fmt.Sprintf("Msi destination is %#q", file.Name())}
defer func() {
if file != nil {
file.Delete()
}
}()
dp := DownloadProgress{Activity: "Downloading update"}
progress <- dp
response, err := connection.Get(fmt.Sprintf(msiPath, update.name), false)
if err != nil {
progress <- DownloadProgress{Error: err}
return
}
defer response.Close()
length, err := response.Length()
if err == nil && length >= 0 {
dp.BytesTotal = length
progress <- dp
}
hasher, err := blake2b.New256(nil)
if err != nil {
progress <- DownloadProgress{Error: err}
return
}
pm := &progressHashWatcher{&dp, progress, hasher}
_, err = io.Copy(file, io.TeeReader(io.LimitReader(response, 1024*1024*100 /* 100 MiB */), pm))
if err != nil {
progress <- DownloadProgress{Error: err}
return
}
if !hmac.Equal(hasher.Sum(nil), update.hash[:]) {
progress <- DownloadProgress{Error: errors.New("The downloaded update has the wrong hash")}
return
}
progress <- DownloadProgress{Activity: "Verifying authenticode signature"}
if !verifyAuthenticode(file.ExclusivePath()) {
progress <- DownloadProgress{Error: errors.New("The downloaded update does not have an authentic authenticode signature")}
return
}
progress <- DownloadProgress{Activity: "Installing update"}
err = runMsi(file, userToken)
if err != nil {
progress <- DownloadProgress{Error: err}
return
}
progress <- DownloadProgress{Complete: true}
}
if userToken == 0 {
go func() {
err := elevate.DoAsSystem(func() error {
doIt()
return nil
})
if err != nil {
progress <- DownloadProgress{Error: err}
}
}()
} else {
go doIt()
}
return progress
}
|
