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<p class="MsoNormal">Hello, </p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">I am new to OpenBMC (and BMC ), so apologies if
I am posting
this in the wrong place. I have been looking at <a
href="https://github.com/openbmc/openbmc/issues/3383">this</a>
issue.<span style="mso-spacerun:yes"> </span>Here is my summary
of the problem statement,
please do comment and let me know if I got this right.</p>
<ol style="margin-top:0in" type="1" start="1">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l3
level1 lfo1">The biggest challenge is the use of system bus and
non root access to the system bus. </li>
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l3
level1 lfo1">As previously suggested an ACL based approach can
work. (whether it is using a D-Bus ACL configuration file or
SELinux) </li>
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l3
level1 lfo1">However, it does require an exact configuration to
cover all security scenarios (for MAC) and IMO “may” make
debugging efforts harder.<span style="mso-spacerun:yes"> </span></li>
</ol>
<p class="MsoNormal">Coming from a desktop background (which
additionally uses
D-BUS session/user bus for user isolation), I was investigating if
having a
session bus would help. For OpenBMC, the idea would be to allow
non root
application to communicate with each other and with root**
applications on a
single session bus to begin with. This can be further augmented
using ACL based
approaches if needed. I have a small POC, which tests this on
OpenBMC with
D-Bus broker</p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="mso-ascii-font-family:Calibri;mso-fareast-font-family:"Times
New Roman";
mso-hansi-font-family:Calibri;mso-bidi-font-family:Calibri">To
run the demo</span></p>
<ul type="disc">
<li class="MsoListParagraph"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;margin-left:0in;mso-list:l0 level1 lfo1"><span
style="mso-ascii-font-family:
Calibri;mso-fareast-font-family:"Times New
Roman";mso-hansi-font-family:
Calibri;mso-bidi-font-family:Calibri">As root, copy files
dbus_session.service and dbus_session.socket to
/etc/systemd/system/</span></li>
<li class="MsoListParagraph"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;margin-left:0in;mso-list:l0 level1 lfo1"><span
style="mso-ascii-font-family:
Calibri;mso-fareast-font-family:"Times New
Roman";mso-hansi-font-family:
Calibri;mso-bidi-font-family:Calibri">useradd nirav //or
change the .service and .socket file to your user</span></li>
<li class="MsoListParagraph"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;margin-left:0in;mso-list:l0 level1 lfo1"><span
style="mso-ascii-font-family:
Calibri;mso-fareast-font-family:"Times New
Roman";mso-hansi-font-family:
Calibri;mso-bidi-font-family:Calibri">systemctl daemon-reload</span></li>
<li class="MsoListParagraph"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;margin-left:0in;mso-list:l0 level1 lfo1"><span
style="mso-ascii-font-family:
Calibri;mso-fareast-font-family:"Times New
Roman";mso-hansi-font-family:
Calibri;mso-bidi-font-family:Calibri">systemctl start
dbus_session</span></li>
<li class="MsoListParagraph"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;margin-left:0in;mso-list:l0 level1 lfo1"><span
style="mso-ascii-font-family:
Calibri;mso-fareast-font-family:"Times New
Roman";mso-hansi-font-family:
Calibri;mso-bidi-font-family:Calibri">ps | grep dbus //will
show an additional dbus-broker running</span></li>
<li class="MsoListParagraph"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;margin-left:0in;mso-list:l0 level1 lfo1"><span
style="mso-ascii-font-family:
Calibri;mso-fareast-font-family:"Times New
Roman";mso-hansi-font-family:
Calibri;mso-bidi-font-family:Calibri">compile dbus_server.c
and dbus_client.c using yocto sdk or write a receipe</span></li>
<li class="MsoListParagraph"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;margin-left:0in;mso-list:l0 level1 lfo1"><span
style="mso-ascii-font-family:
Calibri;mso-fareast-font-family:"Times New
Roman";mso-hansi-font-family:
Calibri;mso-bidi-font-family:Calibri">ssh as root, export
DBUS_SESSION_BUS_ADDRESS</span>=<span
style="mso-ascii-font-family:Calibri;mso-fareast-font-family:"Times
New Roman";
mso-hansi-font-family:Calibri;mso-bidi-font-family:Calibri">unix:path=/run/user/bus1
and ./dbus_server</span></li>
<li class="MsoListParagraph"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;margin-left:0in;mso-list:l0 level1 lfo1"><span
style="mso-ascii-font-family:
Calibri;mso-fareast-font-family:"Times New
Roman";mso-hansi-font-family:
Calibri;mso-bidi-font-family:Calibri">ssh as nirav, export
DBUS_SESSION_BUS_ADDRESS</span>=<span
style="mso-ascii-font-family:Calibri;mso-fareast-font-family:"Times
New Roman";
mso-hansi-font-family:Calibri;mso-bidi-font-family:Calibri">unix:path=/run/user/bus1
and ./dbus_client</span></li>
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<p class="MsoNormal">With the POC I was able to …..</p>
<ol style="margin-top:0in" type="1" start="1">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0
level1 lfo2">Show dbus_broker_launch “–scope user” works on
OpenBMC (A session busses can be created using the right system
unit files and launcher provided by D-Bus broker)</li>
<ol style="margin-top:0in" type="1" start="1">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0
level2 lfo2">Since I am new to D-Bus broker and systemd I had
to confirm this. </li>
</ol>
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0
level1 lfo2">Show DBUS_SESSION_BUS_ADDRESS is the only env
variable required by root to access the session bus of another
user. There is a limitation here, discussed below. </li>
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<p class="MsoNormal">As far as the actual solution, idea would be to
have a
configuration file to specify which D-Bus interfaces can be on the
session bus.
An opt in model which does not need any modification to existing
and future OpenBMC
daemons/applications would be the goal but there are limitations
…..</p>
<ul style="margin-top:0in" type="disc">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l1
level1 lfo4">For root**, to access another user’s session bus,
its needs to setuid/setgid to the corresponding user.</li>
</ul>
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<ul style="margin-top:0in" type="circle">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l2
level2 lfo3">This is because D-Bus actively blocks any user
even uid 0 from accessing another’s session bus. It would be a
simple patch to make an exception for root. But still
something that needs to be maintained. </li>
</ul>
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l2
level1 lfo3">My POC was not using sdbus/plus. At the very least,
modification will be needed to sdbusplus, sdbus, phosphor-dbus
and possibly to object mapper. Not sure if more applications
need to change.</li>
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l2
level1 lfo3">Supporting multiple session D-Buses will be really
complicated for a lot of reasons. So even if session bus is a
reasonable idea (which I need feedback on), I would not jump
into having a session bus per usecase from the get-go. </li>
</ul>
<p class="MsoNormal">I am happy to start with a design document on
git hub and also
make some code changes, but I had a few questions.</p>
<ol style="margin-top:0in" type="1" start="1">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l4
level1 lfo5">Your views on, if this a workable idea?</li>
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l4
level1 lfo5">I am hoping I can isolate all the changes to
sdbusplus, sdbus, phosphor-dbus and object mapper. What else
might need to change?</li>
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l4
level1 lfo5">If I can make all these changes, I was thinking of
starting with BMCWeb as non root but since BMCWeb interfaces
with a lot of daemons that would be a big step. Any better
ideas?</li>
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<p><br>
</p>
<p><br>
</p>
<p class="MsoNormal">Thanks,</p>
<p class="MsoNormal">Nirav.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal"> </p>
<p class="MsoNormal"> </p>
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<div class="moz-signature">-- <br>
Nirav Shah</div>
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