golang with fastcgi how to read REMOTE_USER

Question

Short: How can I read the CGI var REMOTE_USER on golang using fastcgi?

Long: I'm trying to write a program in go to work behind a httpd using fcgi over a socket. The httpd does the ssl termination and provides basic auth. I need to read $REMOTE_USER, but I cannot in golang, while I can in perl.

My code is based on this fcgi example. I try

func homeView(w http.ResponseWriter, r *http.Request) {     
    user, pass, authok := r.BasicAuth()

But authok is always false, user and pass remain empty, although I know for sure that the authorization (done by httpd) was OK. To eliminate other errors, I have done it in perl:

my $socket = FCGI::OpenSocket("/run/fcgi-check.sock", 5);
my $q = FCGI::Request(\*STDIN, \*STDOUT, \*STDERR, \%ENV, $socket);

while ($q->Accept() >= 0) {
    my $c = CGI::Simple->new;
    my $user_id      = $c->remote_user(); 

and it works fine in perl.

To debug, I printed the output of r.Header and I got:

map[Authorization:[]

Am I right that the header that go sees does no hold any information about any authorization? But it does in perl.

Here is a full but minimal golang code example that demonstrates the problem (on OpenBSD 5.8 with go version go1.4.2 openbsd/amd64 and OpenBSDs httpd with 'authenticate "/" with restricted_users' in httpd.conf.

package main

import (
        "github.com/gorilla/mux"
        "io"
        "log"
        "fmt"
        "net"
        "net/http"
        "net/http/fcgi"
)


func homeView(w http.ResponseWriter, r *http.Request) {
        headers := w.Header()
        headers.Add("Content-Type", "text/html")
        headers.Add("Cache-Control", "no-cache, no-store, must-revalidate")
        headers.Add("Pragma", "no-cache")
        headers.Add("Expires", "0")
        r.ParseForm()

        user, pass, authok := r.BasicAuth()

        if authok {
                io.WriteString(w, fmt.Sprintln("Auth OK"))
                io.WriteString(w, fmt.Sprintln("user is: "+user+", pass is: "+pass))
        } else {
                io.WriteString(w, fmt.Sprintln("Auth NOT OK"))
        }
}

func main() {

        r := mux.NewRouter()
        r.HandleFunc("/check/", homeView)

    var err error
        listener, err := net.Listen("unix", "/run/fcgi-check.sock")
        if err != nil {
                log.Fatal(err)
        }
        defer listener.Close()

        err = fcgi.Serve(listener, r)
        if err != nil { log.Fatal(err)}
}

Help will be appreciated!

Thanks in advance! T.

Answer 1

The simple answer (as of go version 1.4.2) is that go currently does not support the transfer of CGI variable REMOTE_USER.