[Xastir] th-d72a

[Kurt Savegnago]

Good point but I'm the only one on the machine and I doubt that anyone else
in my town of 15,000 run Linux. :-)          Kurt KC9LDH :-)

--- On Sat, 3/12/11, Curt, WE7U <curt.we7u at gmail.com> wrote:

> From: Curt, WE7U <curt.we7u at gmail.com>
> Subject: Re: [Xastir] th-d72a
> To: "Xastir - APRS client software discussion" <xastir at lists.xastir.org>
> Date: Saturday, March 12, 2011, 6:10 PM
> On Sat, 12 Mar 2011, Kurt Savegnago
> wrote:
> 
> > When I plug something in to the USB port, I have to do
> a
> > sudo chmod 777 /dev/ttyUSB0 from a terminal
> 
> That opens up the port to everyone for read/write.  A
> better way is to do this first to see which group owns the
> port:
> 
>     ls -l /dev/ttyUSB0
> 
> For instance:
> 
>   > ls -l /dev/ttyS*
>   crw-rw---- 1 root dialout 4, 64 2011-03-12 16:01
> ttyS0
>   crw-rw---- 1 root dialout 4, 65 2011-03-10 01:39
> ttyS1
>   crw-rw---- 1 root dialout 4, 66 2011-03-10 01:39
> ttyS2
>   crw-rw---- 1 root dialout 4, 67 2011-03-10 01:39
> ttyS3
>   crw-rw---- 1 root dialout 4, 68 2011-03-10 01:39
> ttyS4
>   crw-rw---- 1 root dialout 4, 69 2011-03-10 01:39
> ttyS5
>   crw-rw---- 1 root dialout 4, 70 2011-03-10 01:39
> ttyS6
>   crw-rw---- 1 root dialout 4, 71 2011-03-10 01:39
> ttyS7
> 
> In this case I would add the "dialout" group to my user
> account via "yast2" (OpenSuSE's admin program), then log out
> as that user and log in again to get the new
> privileges.  The above lines tell me this:
> 
>   The "root" owner has read/write privileges.
>   The "dialout" group has read/write privileges.
>   "Other" users have no privileges on this port.
> 
> The "777" you talk about above would change them to this:
> 
>   crwxrwxrwx 1 root dialout 4, 64 2011-03-12 16:01
> ttyS0
> 
> Which gives read/write privileges to the "other" group (as
> well as execute privileges to all three groups of users) but
> is a bad idea security-wise.
> 
> -- Curt, WE7U.        http://www.eskimo.com/~archer
> APRS:  Where it's at!        http://www.xastir.org
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