X2Go Bug report logs - #1131
x2gosqlitewrapper - Session not opening when username starts with a number

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Package: x2goserver; Maintainer for x2goserver is X2Go Developers <x2go-dev@lists.x2go.org>; Source for x2goserver is src:x2goserver.

Reported by: Frank Knoben <admin@igpm.rwth-aachen.de>

Date: Mon, 9 Jan 2017 13:40:01 UTC

Severity: normal

Found in version 4.0.1.20

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X-Loop: owner@bugs.x2go.org
Subject: Bug#1131: [X2Go-Dev] Bug#1131: x2gosqlitewrapper - Session not opening when username starts with a number
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To: Frank Knoben <admin@igpm.rwth-aachen.de>, 1131@bugs.x2go.org
References: <9ed12fe6-4cf4-1730-5bef-318186c77ecd@igpm.rwth-aachen.de>
From: Stefan Baur <X2Go-ML-1@baur-itcs.de>
Message-ID: <0a8205f7-aa75-13f6-071d-1b52a4f74858@baur-itcs.de>
Date: Mon, 9 Jan 2017 14:50:01 +0100
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[Message part 1 (text/plain, inline)]
reassign -1 x2goserver

Hi,

this problem occurs because your user names are violating the POSIX
standard, which states that usernames must not begin with digits.

Let me guess, you are authenticating against a Windows Domain / Active
Directory, which obviously doesn't care about POSIX (well, why should it).

So far, our stance was that we should conform to POSIX standards.

However, this issue has cropped up quite a bit lately, so maybe adding
support for corresponding config options to /etc/x2go/x2goserver.conf
would be an idea - something like

# support usernames that violate POSIX standard
allow_usernames_with_leading_digit=true|false
allow_usernames_with_backslashes=true|false # would fix Bug #227 as well

And while we're at it, let me suggest these as well, just for good
measure - not sure if they still pose a problem but we did have issues
with at least dashes in the past (ca. 2012):
allow_usernames_with_slashes=true|false
allow_usernames_with_dashes=true|false
allow_usernames_with_spaces=true|false

I wonder what the developers think about this approach?

Kind Regards,
Stefan Baur

Am 09.01.2017 um 14:25 schrieb Frank Knoben:
> Package: x2gosqlitewrapper
> Version: 4.0.1.20-3.4
> 
> When a username starts with a number, the session on the client computer
> will not open, after connecting to the server.
> The problem lies within x2gosqlitewrapper.pl in the sanitizer function.
> This function will return 0 in the  $type eq "x2gosid" case, when the
> username starts with a number.
> My workaround is to add a 0-9 in the line number 67 of x2gosqlitewrapper.pl
> 
> 
> diff x2gosqlitewrapper.pl x2gosqlitewrapper.pl.original
> 67c67
> <                       if ($string =~
> /^([a-zA-Z0-9\_][a-zA-Z0-9\_\-\.\@]{0,47}[\$]?)\-([\d]{2,4})\-([\d]{9,12})\_[a-zA-Z0-9\_\-\.]*\_dp[\d]{1,2}$/)
> {
> ---
>>                       if ($string =~
>> /^([a-zA-Z\_][a-zA-Z0-9\_\-\.\@]{0,47}[\$]?)\-([\d]{2,4})\-([\d]{9,12})\_[a-zA-Z0-9\_\-\.]*\_dp[\d]{1,2}$/)
>> {
> 
> 
> elsif ($type eq "x2gosid") {
>                 $string =~ s/[^a-zA-Z0-9\_\-\$\.\@]//g;
>                 if ($string =~ /^([a-zA-Z0-9\_\-\$\.\@]*)$/) {
>                         $string = $1;
> -                        if ($string =~
> /^([a-zA-Z\_][a-zA-Z0-9\_\-\.\@]{0,47}[\$]?)\-([\d]{2,4})\-([\d]{9,12})\_[a-zA-Z0-9\_\-\.]*\_dp[\d]{1,2}$/)
> {
> +                        if ($string =~
> /^([a-zA-Z0-9\_][a-zA-Z0-9\_\-\.\@]{0,47}[\$]?)\-([\d]{2,4})\-([\d]{9,12})\_[a-zA-Z0-9\_\-\.]*\_dp[\d]{1,2}$/)
> {
>                                 if ((length($1) > 0) and (length($1) <
> 48)){
>                                         return $string;
>                                 } else {return 0;}
>                         } else {return 0;}
>                 } else {return 0;}
>         }
> 
> I  am using a OpenSuSE Leap System with x2goserver Version 4.0.1.20-3.4
> 
> Sincerly
> 
> Frank Knoben
> _______________________________________________
> x2go-dev mailing list
> x2go-dev@lists.x2go.org
> http://lists.x2go.org/listinfo/x2go-dev


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