X2Go Bug report logs - #611
X2Go Client for Windows cannot create C:\Users\<username>\ssh\known_hosts file when the username has characters from languages other than the system locale

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Package: x2goclient; Maintainer for x2goclient is X2Go Developers <x2go-dev@lists.x2go.org>; Source for x2goclient is src:x2goclient.

Reported by: <trakatelis@uom.gr>

Date: Mon, 11 Aug 2014 10:55:01 UTC

Severity: normal

Found in version

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X-Loop: owner@bugs.x2go.org
Subject: Bug#566: [X2Go-Dev] Bug#566: X2Go Client for Windows cannot create C:\Users\<username>\ssh\known_hosts file when the local Windows account username has non-Ascii characters
Reply-To: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>, 566@bugs.x2go.org
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Date: Mon, 08 Sep 2014 08:58:33 +0000
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From: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>
To: Michael DePaulo <mikedep333@gmail.com>
Cc: George Trakatelis <trakatelis@uom.edu.gr>, 566@bugs.x2go.org
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Hi Mike#2,

On  So 07 Sep 2014 15:23:22 CEST, Michael DePaulo wrote:

> On Sun, Sep 7, 2014 at 6:04 AM, George Trakatelis  
> <trakatelis@uom.edu.gr> wrote:
> [...]
>> a. Installed German keyboard. Hit ';' to produce an accented letter
>> and -to my surprise- got ö. So I thought ölexandr was the right  
>> name to test for username.
>> b. Created user ölexandr and logged in as that user.
>> The patch did not work, as you mentioned.
>> c. As toLocal8Bit() returns the local 8-bit representation of a string,
>> I changed the system locale for non-unicode programs to German.
>> Now the patch worked!
>> I think the patch solves the problem for the Windows users who use English
>> as a foreign language and prefer having (non-Ascii) usernames in  
>> their native language.
>> -George
>> PS. A better title for the bug would be
>> X2Go Client for Windows cannot create  
>> C:\Users\<username>\ssh\known_hosts file when the local Windows  
>> account username has non-Ascii characters
> Hi Mike#1 and George,
> 1. What do you think of using toUtf8() instead? I am hoping that will
> fix the bug regardless of the locale.
> I tried changing it to that (bug566.utf8.test.patch), but it still did
> not fix this bug with the greek username on my system with the locale
> set to English. It did not introduce a regression for my ASCII user
> account at least.
> If libssh needs to be recompiled for Unicode, I can do that. I just
> recompiled it for bug #590.
> FYI: This is the API we are calling:
> http://api.libssh.org/stable/group__libssh__session.html#ga7a801b85800baa3f4e16f5b47db0a73d

I am getting the suspicion, that this is a libssh issue.

X2Go Client and libssh should communicate via UTF-8 (because it is  
_the_ encoding that applications use internally, nowadays) and libssh  
should handle whatever conversion (probably to UTF-16 wide string?) is  
necessary for creating files, being aware of usernames, etc.

> 2. in sshmasterconnection.cpp, we also set "SSH_OPTIONS_USER" . I
> think that we should also change its value from to.Ascii() to
> toLocal8Bit() or toUtf8(). bug566.test.v2.patch has this change for
> toLocal8Bit(), and bug566.utf8.test.patch has it for toUtf8().

Same thing. SSH_OPTIONS_USER should be set as UTF-8 and libssh should  
convert to whatever encoding is needed.



mike gabriel, herweg 7, 24357 fleckeby
fon: +49 (1520) 1976 148

GnuPG Key ID 0x25771B31
mail: mike.gabriel@das-netzwerkteam.de, http://das-netzwerkteam.de

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