Etch: DBUS and powersave daemon message

Hi.

Each time I start KDE I get a message,

"You are not permitted to connect to the powersave
daemon via DBUS.
Please check your DBUS configuration and
installation."

This happened with both the AMD64 and i386 installs. I have
made no
changes to the HAL, DBUS or any other subsystem.

Google searches are turning up a lot of translations of the
phrase,
but no help. Can someone suggest a avenue of investigation?

Curt-


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On Thursday 17 May 2007, Curt Howland wrote:
> Hi.
>
> Each time I start KDE I get a message,
>
> "You are not permitted to connect to the powersave
daemon via DBUS.
> Please check your DBUS configuration and
installation."
>
> This happened with both the AMD64 and i386 installs. I
have made no
> changes to the HAL, DBUS or any other subsystem.
>
> Google searches are turning up a lot of translations of
the phrase,
> but no help. Can someone suggest a avenue of
investigation?

Check if your user is member of the group
"powerdev"

Or more generally:
Daemons with D-Bus interfaces on the D-Bus system bus can
restrict who can 
call which of those functions.
To tell the D-Bus daemon about this restrictions, they
install a policy file 
in /etc/dbus-1/system.d

In the example of powersave daemon, there is a file
/etc/dbus-1/system.d/powersave.conf

At the end it details what "desktop users" are
allowed to do and it specifies 
that those users have to be in the group
"powerdev"

Cheers,
Kevin

-- 
Kevin Krammer, KDE developer, xdg-utils developer
KDE user support, developer mentoring

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

On Thursday 17 May 2007, Kevin Krammer was heard to say:
> On Thursday 17 May 2007, Curt Howland wrote:
> > "You are not permitted to connect to the
powersave daemon via
> > DBUS. Please check your DBUS configuration and
installation."
> Check if your user is member of the group
"powerdev"

Well, I forgot to look before adding, but he certainly is 
now. "powerdev" shows up in the user's
"groups" listing.

> In the example of powersave daemon, there is a file
> /etc/dbus-1/system.d/powersave.conf
>
> At the end it details what "desktop users"
are allowed to do and it
> specifies that those users have to be in the group
"powerdev"

And sure enough it says "policygroup powerdev".

After doing the "addgroup user powerdev" command,
I exited KDE and 
logged back in. Unfortunately the message came up again.

Will it require a reboot maybe?

Curt-



- -- 
September 11th, 2001
The proudest day for gun control and central 
planning advocates in American history

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On Thursday 17 May 2007 20:35, Curt Howland
Howland-at-priss.com |debian_kde| 
wrote:
> Will it require a reboot maybe?
No. The following will do.
# /etc/init.d/powersaved restart


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On Thursday 17 May 2007, yemxcuq02sneakemail.com was heard to
say:
> > Will it require a reboot maybe?
>
> No. The following will do.
> # /etc/init.d/powersaved restart

Ah, well, that alone did not suffice, the error was still
displayed 
after a restart of X.

By the time I got to trying it the long file transfer in the

background was done. So...

A reboot did in fact clear whatever was left to clean up.
Adding the 
user to group powerdev was the answer, thank you. Maybe the
search 
engines will pick this up and the next person along won't
have to 
ask. :^) Along with "chmod 777 /dev/dsp" which I
always have to do by 
hand with every install.

Thank you,

Curt-

- -- 
September 11th, 2001
The proudest day for gun control and central 
planning advocates in American history

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Hi,

2007 m. May 18 d., Friday, Curt Howland raðë:
>Along with "chmod 777 /dev/dsp" which I always
have to do by
> hand with every install.
Why? Just add the user(s) to the audio group. Installer does
this by default.


-- 
Modestas Vainius <geromanasmailas.com>

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On Friday 18 May 2007, Modestas Vainius was heard to say:
> 2007 m. May 18 d., Friday, Curt Howland rašė:
> >Along with "chmod 777 /dev/dsp" which I
always have to do by
> > hand with every install.
>
> Why? Just add the user(s) to the audio group. Installer
does this
> by default.

Ah, but if it did it by default, I wouldn't have to do it by
hand 
would I?

Just like the single user on the machine not being added to
the 
powerdev group automatically. If it had, we wouldn't be
having this 
discussion.

- From a server administration standpoint, adding a new user
to various 
groups by hand makes sense. This is not a server, it's a
desktop 
machine with one user that has been there since the system
was first 
installed. 

What user, new to Linux, is even going to know the addgroup
command 
exists? Or after 12 years of using Debian, someone like
myself who 
finds it more efficient to just change the permissions on
the device 
that seems to be broken?

But thank you for the suggestion. I will go through and list
all the 
groups (by the only way I know how, cat /etc/group) and add
the one 
user to every group that isn't obviously wrong. Who knows
what 
problems this might cause? I don't know. Maybe changing the

permissions on /dev/dsp, /dev/hdc, /dev/raw1394 and the 
other "problems" that come up from time to time
isn't such a bad idea 
after all.

Curt-

- -- 
September 11th, 2001
The proudest day for gun control and central 
planning advocates in American history

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HI,

2007 M. MAY 18 D., FRIDAY, CURT HOWLAND RA??:
> JUST LIKE THE SINGLE USER ON THE MACHINE NOT BEING
ADDED TO THE
> POWERDEV GROUP AUTOMATICALLY. IF IT HAD, WE WOULDN'T BE
HAVING THIS
> DISCUSSION.
INSTALLER DID THIS SINCE SARGE (FOR AUDIO, VIDEO, CDROM,
FLOPPY, PLUGDEV, 
DIALOUT, DIP AND SIMILAR), IIRC. BY THE WAY, THIS IS DONE
ONLY FOR THE USER 
YOU CREATE DURING INSTALLATION. IF YOU CREATE A NEW USER
MANUALLY, YOU ALSO 
HAVE TO ADD TO THE GROUPS MANUALLY. DO YOU SELECT THE
DESKTOP TASK IN 
TASKSEL?

I'M NOT REALLY SURE ABOUT 'POWERDEV' GROUP, IT'S PRETTY NEW.
BUT I BELIEVE 
ETCH INSTALLER SHOULD DEFINITELY ADD THE USER TO THIS GROUP
WHEN YOU 
CHOOSE 'LAPTOP' TASK.

> WHAT USER, NEW TO LINUX, IS EVEN GOING TO KNOW THE
ADDGROUP COMMAND
> EXISTS? OR AFTER 12 YEARS OF USING DEBIAN, SOMEONE LIKE
MYSELF WHO
> FINDS IT MORE EFFICIENT TO JUST CHANGE THE PERMISSIONS
ON THE DEVICE
> THAT SEEMS TO BE BROKEN?
MAKING PERMISSIONS 777 YOU SACRIFICE SECURITY FOR "EASE
OF USE" AND 
CONVINIENCE. IT'S YOUR CHOICE.

> BUT THANK YOU FOR THE SUGGESTION. I WILL GO THROUGH AND
LIST ALL THE
> GROUPS (BY THE ONLY WAY I KNOW HOW, CAT /ETC/GROUP) AND
ADD THE ONE
> USER TO EVERY GROUP THAT ISN'T OBVIOUSLY WRONG. WHO
KNOWS WHAT
> PROBLEMS THIS MIGHT CAUSE?
IT WILL MAKE YOUR USER MORE POWERFUL. E.G. IF YOU ADD YOUR
USER TO THE 
GROUP 'DISK', YOU (OR OTHER PROCESS RUNNING WITH THE RIGHTS
OF YOUR USER) 
POTENTIALLY CAN DO MUCH HARM WITHOUT A WARNING, E.G.:

$ DD IF=/DEV/ZERO OF=/DEV/<YOUR HARD DISK HERE>

OTHER THAN WEAKENED SECURITY, THERE SHOULD BE NO
CONSIQUENCES ADDING A USER TO 
A SYSTEM GROUP. UNLESS THE GROUP IS VERY SPECIALIZED.


-- 
MODESTAS VAINIUS <GEROMANASMAILAS.COM>

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

On Friday 18 May 2007, Modestas Vainius was heard to say:
> 2007 m. May 18 d., Friday, Curt Howland rašė:
> > Just like the single user on the machine not being
added to the
> > powerdev group automatically. If it had, we
wouldn't be having
> > this discussion.
>
> Installer did this since sarge (for audio, video,
cdrom, floppy,
> plugdev, dialout, dip and similar), iirc. By the way,
this is done
> only for the user you create during installation. If
you create a
> new user manually, you also have to add to the groups
manually.

I understand. All the problems I have run into have been for
the user 
created during installation.

> Do 
> you select the desktop task in tasksel?

No, I do not use tasksel.

> I'm not really sure about 'powerdev' group, it's pretty
new. But I
> believe Etch installer should definitely add the user
to this group
> when you choose 'laptop' task.

At the end of the install, it does present me with the
tasksel 
options, I unselect desktop (because I do not want GNOME)
and leave 
laptop and standard. These problems still occurred.

> > What user, new to Linux, is even going to know the
addgroup
> > command exists? Or after 12 years of using Debian,
someone like
> > myself who finds it more efficient to just change
the permissions
> > on the device that seems to be broken?
>
> Making permissions 777 you sacrifice security for
"ease of use" and
> convinience. It's your choice.

Since "addgroup" was unknown until yesterday, I
didn't sacrifice 
anything for convenience. I fixed a problem that otherwise
would make 
the machine _UNUSABLE_.

So sure, "it's my choice", but that or go back to
Windows? Yeah, some 
choice.

You might also notice that, with my rhetorical question
about problems 
that it might cause, I am fully aware that adding a user to
every 
group sacrifices security.

- -- 
September 11th, 2001
The proudest day for gun control and central 
planning advocates in American history

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Curt Howland wrote:
> Hi.
> 
> Each time I start KDE I get a message,
> 
> "You are not permitted to connect to the powersave
daemon via DBUS.
> Please check your DBUS configuration and
installation."
> 
> This happened with both the AMD64 and i386 installs. I
have made no
> changes to the HAL, DBUS or any other subsystem.
> 
> Google searches are turning up a lot of translations of
the phrase,
> but no help. Can someone suggest a avenue of
investigation?

Hi Curt,

it's always a good idea, after installing a package, to
read
/usr/share/doc/$package/README.Debian, if existent.

If you do that for powersaved, this whole issue is explained
there in
detail.

And as already outlined earlier, for new installations, the
default user
is automatically added to groups like powerdev (power
management),
netdev (network-manager) and plugdev (mounting of removable
devices).

On a upgrade this is unfortunately not possible to do in an
automated
fashion, as we can't know, which user is the default one.
So the only option is to document the necessary steps, which
is usually
done in a README.Debian file.

Cheers,
Michael (maintainer of powersave+kpowersave)

-- 
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life in the
universe are pointed away from Earth?