systemd service not connecting to session dbus

deepan.muthusamy@xxxxxxx (Deepan Muthusamy) · Mon, 13 Aug 2018 12:36:54 +0000

My application has to communicate to both system dbus and session dbus and I want to start my application through systemd. How to do that?
DEEPAN MUTHUSAMY,
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Subject: systemd-devel Digest, Vol 100, Issue 16

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Today's Topics:

   1.  systemd service not connecting to session dbus
      (Deepan  Muthusamy)
   2. Re:  systemd service not connecting to session dbus
      (JÃ©rÃ©my Rosen)
   3.  Restarting a service as user instead as root (Cecil Westerhof)
   4. Re:  Restarting a service as user instead as root (Reindl Harald)
   5. Re:  Restarting a service as user instead as root (Silvio Knizek)

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Message: 1
Date: Mon, 13 Aug 2018 07:17:51 +0000
From: "Deepan  Muthusamy" <deepan.muthusamy@xxxxxxx>
To: "systemd-devel at lists.freedesktop.org"
        <systemd-devel at lists.freedesktop.org>
Subject: systemd service not connecting to session
        dbus
Message-ID: <1534144671090.92749 at tcs.com>
Content-Type: text/plain; charset="iso-8859-1"

I have an application which has to communicate with session dbus. If I start my application binary manually or start using Init.d, it is connecting to session d-bus.

But if I start my application through systemd, it is failing to start.  I tried to start using systemctl start my-service-name, this time also it is failing.

And also I go through the answer given by keithel in https://serverfault.com/questions/892465/starting-systemd-services-sharing-a-session-d-bus-on-headless-system .

Still Iam facing the same error.

The .service fail is as follows:

[Unit]
Requires= dbus.socket
After= dbus.socket

[Service]
Type=dbus
BusName=org.client
ExecStart=/usr/local/bin/myExe
TimeoutSec=300
WatchdogSec=20

[Install]
WantedBy=basic.target

Operating system:
Ubuntu 16.04 (64-bit)

DEEPAN MUTHUSAMY,
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Message: 2
Date: Mon, 13 Aug 2018 10:10:21 +0200
From: JÃ©rÃ©my Rosen <jeremy.rosen@xxxxxxxx>
To: systemd-devel at lists.freedesktop.org
Subject: Re: systemd service not connecting to session
        dbus
Message-ID: <39db67b3-c51f-3cdd-156d-2fc06ae34587 at smile.fr>
Content-Type: text/plain; charset="windows-1252"; Format="flowed"

There are two types of systemd instances
* system instance (PID1) which controls the machine as a whole
* user instances that are started when the user logs in.

You seem to have a system service (started by the system session). A
system service can't (easily) access the user bus.
The session bus is started by the user instance when the user login. If
the user hasn't logged in yet, the bus isn't started.
Moreover, the user bus is found via an environment variable, which is
not set for system services (even when User= is used)

What are you trying to do exactly ? should your service be a session
service ?

Regards
Jeremy

On 13/08/2018 09:17, Deepan Muthusamy wrote:
> I have an application which has to communicate with session dbus. If I start my application binary manually or start using Init.d, it is connecting to session d-bus.
>
> But if I start my application through systemd, it is failing to start.  I tried to start using systemctl start my-service-name, this time also it is failing.
>
>
> And also I go through the answer given by keithel in https://serverfault.com/questions/892465/starting-systemd-services-sharing-a-session-d-bus-on-headless-system .
>
> Still Iam facing the same error.
>
>
> The .service fail is as follows:
>
>
> [Unit]
> Requires= dbus.socket
> After= dbus.socket
>
> [Service]
> Type=dbus
> BusName=org.client
> ExecStart=/usr/local/bin/myExe
> TimeoutSec=300
> WatchdogSec=20
>
> [Install]
> WantedBy=basic.target
>
>
> Operating system:
> Ubuntu 16.04 (64-bit)
>
>
>
>
>
>
>
>
>
> DEEPAN MUTHUSAMY,
> TATA CONSULTANCY SERVICE,
> mobile no: +91 8012309210
> =====-----=====-----=====
> Notice: The information contained in this e-mail
> message and/or attachments to it may contain
> confidential or privileged information. If you are
> not the intended recipient, any dissemination, use,
> review, distribution, printing or copying of the
> information contained in this e-mail message
> and/or attachments to it are strictly prohibited. If
> you have received this communication in error,
> please notify us by reply e-mail or telephone and
> immediately and permanently delete the message
> and any attachments. Thank you
>
>
>
>
>
> _______________________________________________
> systemd-devel mailing list
> systemd-devel at lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/systemd-devel

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Message: 3
Date: Mon, 13 Aug 2018 11:28:20 +0200
From: Cecil Westerhof <cldwesterhof@xxxxxxxxx>
To: systemd-devel at lists.freedesktop.org
Subject: Restarting a service as user instead as root
Message-ID:
        <CAG-LmmD-3CzeBMXaHskbp2Sbeq+=O=OYz8he7oDVVgVFJdWDkA at mail.gmail.com>
Content-Type: text/plain; charset="utf-8"

I have a service that is run as a different user as root. But only root can
restart the service. Is there a way to make 'systemctl restart' work for
the user that runs the service?

--
Cecil Westerhof
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Message: 4
Date: Mon, 13 Aug 2018 11:49:19 +0200
From: Reindl Harald <h.reindl@xxxxxxxxxxxxx>
To: systemd-devel at lists.freedesktop.org
Subject: Re: Restarting a service as user instead as
        root
Message-ID: <5982699b-1a85-98e1-98a7-80caffc13c52 at thelounge.net>
Content-Type: text/plain; charset=utf-8

Am 13.08.2018 um 11:28 schrieb Cecil Westerhof:
> I have a service that is run as a different user as root. But only root
> can restart the service. Is there a way to make 'systemctl restart' work
> for the user that runs the service?

not for system services

just because a service binary drops privileges to a different user is no
indication that this user is allowed to control the service itself - for
security the opposite is true

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

Message: 5
Date: Mon, 13 Aug 2018 11:51:46 +0200
From: Silvio Knizek <killermoehre@xxxxxxx>
To: systemd-devel at lists.freedesktop.org
Subject: Re: Restarting a service as user instead as
        root
Message-ID: <99230679d96507e3a4d2415ca84c60923da9d220.camel at gmx.net>
Content-Type: text/plain; charset="UTF-8"

Am Montag, den 13.08.2018, 11:28 +0200 schrieb Cecil Westerhof:
> I have a service that is run as a different user as root. But only
> root can
> restart the service. Is there a way to make 'systemctl restart' work
> for
> the user that runs the service?

Hi,

you can either define a sudo-rule or you use policykit (polkit) for
this. See
https://wiki.archlinux.org/index.php/Polkit#Allow_management_of_individual_systemd_units_by_regular_users
 for an example. Keep in mind that the polkit feature depends on your
available systemd version.

BR

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