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// Web File Manager
package main
import (
"crypto/tls"
"flag"
"log"
"net"
"net/http"
"os"
"os/user"
"strconv"
"strings"
"syscall"
_ "github.com/breml/rootcerts"
"github.com/juju/ratelimit"
"golang.org/x/crypto/acme/autocert"
)
type multiString []string
var (
vers = "2.0.4"
bindProto = flag.String("proto", "tcp", "tcp, tcp4, tcp6, etc")
bindAddr = flag.String("addr", "127.0.0.1:8080", "Listen address, eg: :443")
bindExtra = flag.String("addr_extra", "", "Extra non-TLS listener address, eg: :8081")
chrootDir = flag.String("chroot", "", "Directory to chroot to")
suidUser = flag.String("setuid", "", "Username to setuid to")
allowRoot = flag.Bool("allow_root", false, "allow to run as uid=0/root without setuid")
logFile = flag.String("logfile", "", "Log file name (default stdout)")
passwdDb = flag.String("passwd", "", "wfm password file, eg: /usr/local/etc/wfmpw.json")
noPwdDbRW = flag.Bool("nopass_rw", false, "allow read-write access if there is no password file")
aboutRnt = flag.Bool("about_runtime", true, "Display runtime info in About Dialog")
showDot = flag.Bool("show_dot", false, "show dot files and folders")
listArc = flag.Bool("list_archive_contents", false, "list contents of archives (expensive!)")
rateLim = flag.Int("rate_limit", 0, "rate limit for upload/download in MB/s, 0 no limit")
wfmPfx = flag.String("prefix", "/", "Default url prefix for WFM access")
docSrv = flag.String("doc_srv", "", "Serve regular http files, fsdir:prefix, eg /var/www/:/home/")
cacheCtl = flag.String("cache_ctl", "no-cache", "HTTP Header Cache Control")
robots = flag.Bool("robots", false, "allow robots")
acmDir = flag.String("acm_dir", "", "autocert cache, eg: /var/cache (inside chroot)")
acmBind = flag.String("acm_addr", "", "autocert manager listen address, eg: :80")
acmWhlist multiString // this flag set in main
f2bEnabled = flag.Bool("f2b", true, "ban ip addresses on user/pass failures")
f2bDump = flag.String("f2b_dump", "", "enable f2b dump at this prefix, eg. /f2bdump (default no)")
)
func userId(usr string) (int, int, error) {
u, err := user.Lookup(usr)
if err != nil {
return 0, 0, err
}
ui, err := strconv.Atoi(u.Uid)
if err != nil {
return 0, 0, err
}
gi, err := strconv.Atoi(u.Gid)
if err != nil {
return 0, 0, err
}
return ui, gi, nil
}
func setUid(ui, gi int) error {
if ui == 0 || gi == 0 {
return nil
}
err := syscall.Setgid(gi)
if err != nil {
return err
}
err = syscall.Setuid(ui)
if err != nil {
return err
}
return nil
}
func (z *multiString) String() string {
return "something"
}
func (z *multiString) Set(v string) error {
*z = append(*z, v)
return nil
}
func main() {
var err error
flag.Var(&acmWhlist, "acm_host", "autocert manager allowed hostname (multi)")
flag.Parse()
if flag.Arg(0) == "user" {
manageUsers()
return
}
log.Print("WFM Starting up")
if *passwdDb != "" {
loadUsers()
}
if *logFile != "" {
lf, err := os.OpenFile(*logFile, os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0644)
if err != nil {
log.Fatal(err)
}
defer lf.Close()
log.SetOutput(lf)
}
// find uid/gid for setuid before chroot
var suid, sgid int
if *suidUser != "" {
suid, sgid, err = userId(*suidUser)
if err != nil {
log.Fatal("unable to find setuid user", err)
}
}
// run autocert manager before chroot/setuid
// however it doesn't matter for chroot as certs will land in chroot *adir anyway
acm := autocert.Manager{}
if *bindAddr != "" && *acmDir != "" && len(acmWhlist) > 0 {
acm.Prompt = autocert.AcceptTOS
acm.Cache = autocert.DirCache(*acmDir)
acm.HostPolicy = autocert.HostWhitelist(acmWhlist...)
go http.ListenAndServe(*acmBind, acm.HTTPHandler(nil))
log.Printf("Autocert enabled for %v", acmWhlist)
}
// chroot now
if *chrootDir != "" {
err := syscall.Chroot(*chrootDir)
if err != nil {
log.Fatal("chroot", err)
}
log.Printf("Chroot to %q", *chrootDir)
}
// listen/bind to port before setuid
l, err := net.Listen(*bindProto, *bindAddr)
if err != nil {
log.Fatalf("unable to listen on %v: %v", *bindAddr, err)
}
log.Printf("Listening on %q", *bindAddr)
// setuid now
err = setUid(suid, sgid)
if err != nil {
log.Fatalf("unable to suid for %v: %v", *suidUser, err)
}
if !*allowRoot && os.Getuid() == 0 {
log.Fatal("you probably dont want to run wfm as root, use --allow_root flag to force it")
}
log.Printf("Setuid UID=%d GID=%d", os.Geteuid(), os.Getgid())
// rate limit setup
if *rateLim != 0 {
rlBu = ratelimit.NewBucketWithRate(float64(*rateLim<<20), 1<<10)
}
// http stuff
mux := http.NewServeMux()
mux.HandleFunc(*wfmPfx, wfmMain)
mux.HandleFunc("/favicon.ico", dispFavIcon)
mux.HandleFunc("/robots.txt", dispRobots)
if *f2bDump != "" {
mux.HandleFunc(*f2bDump, dumpf2b)
}
if *docSrv != "" {
ds := strings.Split(*docSrv, ":")
log.Printf("Starting doc handler for dir %v at %v", ds[0], ds[1])
mux.Handle(ds[1], http.StripPrefix(ds[1], http.FileServer(http.Dir(ds[0]))))
}
if *bindExtra != "" {
log.Printf("Listening (extra) on %q", *bindAddr)
go http.ListenAndServe(*bindExtra, mux)
}
if *bindAddr != "" && *acmDir != "" && len(acmWhlist) > 0 {
https := &http.Server{
Addr: *bindAddr,
Handler: mux,
TLSConfig: &tls.Config{GetCertificate: acm.GetCertificate},
}
log.Printf("Starting HTTPS TLS Server")
err = https.ServeTLS(l, "", "")
} else {
log.Printf("Starting HTTP Server")
err = http.Serve(l, mux)
}
if err != nil {
log.Fatal(err)
}
}
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