Illegal User

Illegal User

[Brian Hancock]

Hi,

I have installed DOSEMU and FreeDOS from the tarball...  I do not have root
access to the server, only as a regular user through SSH...  I have
installed it into a folder on my home drive...

When I execute dosemu I get an "Illegal user" message...

Does anyone have an ideas about how to rectify this?

Regards
Brian 

Re: Illegal user

[Stas Sergeev]

Hello.

Brian Hancock wrote:
> When I execute dosemu I get an "Illegal user" message...
> Does anyone have an ideas about how to rectify this?
See here:
http://sourceforge.net/tracker/?group_id=49784&atid=457448&func=detail&aid=1117902

Re: Illegal user

[Brian Hancock]

Thanks for the link Stas...( 
http://sourceforge.net/tracker/?group_id=49784&atid=457448&func=detail&aid=1117902)

unfortunately it has not helped me with the "Illegal User!!!" message

Just as a summary of what I have looked at:
1.   whoami and id return meaningful information
2.   username c_all was added to the /etc/dosemu/dosemu.users file (now 
removed since it didn't work)
3.   The X-server files were present
    libXext.so.6
    libX11.so.6
    libm.so.6
    libdl.so.2
    libc.so.6    ld-linux.so.2
with the exception of
    libslang.so.1 but there was a libslang-utf8.so.1
       (but I do not need Xdosemu anyway)

4   The library files  libnss_compat.so.1 and libnsl.so.1 are present in the 
/lib directory

When I first ran DOSEMU two directories were created in my home directory.
.dosemu  containing freedos
  and
dosemu containing a drives folder containing a c symbolic link back to the 
freedos directory

Whether you execute dosemu or dosemu.bin it still fails with am "Illegal 
User!!!" message

Does anyone have any other ideas? or did I miss something?

Many thanks
Brian

----- Original Message ----- 
From: "Stas Sergeev" <stsp@aknet.ru>
To: "Brian Hancock" <brian.hancock@brileigh.com>
Cc: "linux-msdos" <linux-msdos@vger.kernel.org>
Sent: Friday, February 10, 2006 5:58 AM
Subject: Re: Illegal user


> Hello.
>
> Brian Hancock wrote:
>> When I execute dosemu I get an "Illegal user" message...
>> Does anyone have an ideas about how to rectify this?
> See here:
> http://sourceforge.net/tracker/?group_id=49784&atid=457448&func=detail&aid=1117902
>
> -
> To unsubscribe from this list: send the line "unsubscribe linux-msdos" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> 

Re: Illegal user

[Brian Hancock]

An additional note...

I have just contact the webhost support and when they tried to execute 
dosemu as root they receive a "vm86plus not available message"... the server 
is a 64-bit system.

Regards
Brian

----- Original Message ----- 
From: "Brian Hancock" <brian.hancock@brileigh.com>
To: <linux-msdos@vger.kernel.org>
Sent: Monday, February 20, 2006 2:19 PM
Subject: Re: Illegal user


> Thanks for the link Stas...( 
> http://sourceforge.net/tracker/?group_id=49784&atid=457448&func=detail&aid=1117902)
>
> unfortunately it has not helped me with the "Illegal User!!!" message
>
> Just as a summary of what I have looked at:
> 1.   whoami and id return meaningful information
> 2.   username c_all was added to the /etc/dosemu/dosemu.users file (now 
> removed since it didn't work)
> 3.   The X-server files were present
>    libXext.so.6
>    libX11.so.6
>    libm.so.6
>    libdl.so.2
>    libc.so.6    ld-linux.so.2
> with the exception of
>    libslang.so.1 but there was a libslang-utf8.so.1
>       (but I do not need Xdosemu anyway)
>
> 4   The library files  libnss_compat.so.1 and libnsl.so.1 are present in 
> the /lib directory
>
> When I first ran DOSEMU two directories were created in my home directory.
> .dosemu  containing freedos
>  and
> dosemu containing a drives folder containing a c symbolic link back to the 
> freedos directory
>
> Whether you execute dosemu or dosemu.bin it still fails with am "Illegal 
> User!!!" message
>
> Does anyone have any other ideas? or did I miss something?
>
> Many thanks
> Brian
>
> ----- Original Message ----- 
> From: "Stas Sergeev" <stsp@aknet.ru>
> To: "Brian Hancock" <brian.hancock@brileigh.com>
> Cc: "linux-msdos" <linux-msdos@vger.kernel.org>
> Sent: Friday, February 10, 2006 5:58 AM
> Subject: Re: Illegal user
>
>
>> Hello.
>>
>> Brian Hancock wrote:
>>> When I execute dosemu I get an "Illegal user" message...
>>> Does anyone have an ideas about how to rectify this?
>> See here:
>> http://sourceforge.net/tracker/?group_id=49784&atid=457448&func=detail&aid=1117902
>>
>> -
>> To unsubscribe from this list: send the line "unsubscribe linux-msdos" in
>> the body of a message to majordomo@vger.kernel.org
>> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>>
> -
> To unsubscribe from this list: send the line "unsubscribe linux-msdos" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> 

Re: Illegal user

[Stas Sergeev]

Hello.

Brian Hancock wrote:
> Whether you execute dosemu or dosemu.bin it still fails with am 
> "Illegal User!!!" message
Do you have dosemu.bin with the suid bit set perhaps?
Illegal user is printed when getpwuid(getuid())==NULL,
which usually shouldn't happen. Try CVS code - it will
print more information on that error.
If nothing helps, just remove that uid checking from
the parser.y.in file and recompile dosemu.

Re: Illegal user

[Stas Sergeev]

[-- Attachment #1: Type: text/plain, Size: 200 bytes --]

Stas Sergeev wrote:
> If nothing helps, just remove that uid checking from
> the parser.y.in file and recompile dosemu.
No, that won't work, don't try.
Run the attached test program instead, please.


[-- Attachment #2: getpw.c --]
[-- Type: text/x-csrc, Size: 215 bytes --]

#include <stdio.h>
#include <sys/types.h>
#include <pwd.h>
#include <unistd.h>
#include <stdlib.h>

int main()
{
  printf("%p\n", getpwuid(getuid()));
  perror("getpw");
  system("ls -l /etc/passwd");
  return 0;
}

Re: Illegal user

[Brian Hancock]

Hi Stav,

Thanks for your assistance...  The webhost had put my account onto a 64-bit 
server...  In trying to sort out the "Illegal User" message, I asked their 
support to try and run DOSEMU as root which they did and got a "vm86plus not 
available" and then they mentioned to me that it was on a 64 bit server... 
They moved it over to a 32-bit server and everything works fine...

Sorry to send you out chasing a red herring...

Regards
Brian



----- Original Message ----- 
From: "Stas Sergeev" <stsp@aknet.ru>
To: <linux-msdos@vger.kernel.org>
Sent: Tuesday, February 21, 2006 4:22 AM
Subject: Re: Illegal user


> Stas Sergeev wrote:
>> If nothing helps, just remove that uid checking from
>> the parser.y.in file and recompile dosemu.
> No, that won't work, don't try.
> Run the attached test program instead, please.
>
>


--------------------------------------------------------------------------------


> #include <stdio.h>
> #include <sys/types.h>
> #include <pwd.h>
> #include <unistd.h>
> #include <stdlib.h>
>
> int main()
> {
>  printf("%p\n", getpwuid(getuid()));
>  perror("getpw");
>  system("ls -l /etc/passwd");
>  return 0;
> }
> 

Re: Illegal user

[Stas Sergeev]

Hello.

Brian Hancock wrote:
> server...  In trying to sort out the "Illegal User" message, I asked 
> their support to try and run DOSEMU as root which they did and got a
The thing is that you are not supposed to run
dosemu as root, as this is a serious security threat.
Even though you haven't run my test program, I suspect
that the problem was that /etc/passwd wasn't readable
for the user, and when you started dosemu as root, it
was able to read /etc/passwd. Normally /etc/passwd is
readable for the users, so dosemu can run.

> Sorry to send you out chasing a red herring...
I don't think so, dosemu is not supposed to require root
to run. As for the 64bit CPU - yes, switching to the 32bit
one is the solution for now.