Debian Bug report logs - #784596
missing or legacy subuid/subgid entries

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Message #5 received at submit@bugs.debian.org (full text, mbox, reply):

From: Christoph Anton Mitterer <calestyo@scientia.net>

To: Debian Bug Tracking System <submit@bugs.debian.org>

Subject: systemd: missing or legacy subuid/subgid entries

Date: Thu, 07 May 2015 02:40:03 +0200

Package: systemd
Version: 215-17
Severity: normal


Hey.

I was running some tests on the differences between a systemd
that was kept constantly at sid level and such that was upgraded
from wheezy to jessie.

During that I've noticed that /etc/subuid and /etc/subgid have
entries like the following on the sid system:
systemd-timesync:165536:65536
systemd-network:231072:65536
systemd-resolve:296608:65536
systemd-bus-proxy:362144:65536

whereas the jessie system doesn't have.

Both run obviously with systemd and since the version of systemd
is the same in jessie and sid I'd have assumed that the files
would have either both these entries or neither of them.


So maybe this is either a case of:
- something's missing in jessie (why?)
or
- something's to much in my sid installation (which would then smell
  after legacy stuff from an intermediate version that hasn't been
  cleaned up properly.


In any cases, this is the pointer for you maintainers, since you have
probably a better clue than I do :-)


Cheers,
Chris.

Message #10 received at 784596-done@bugs.debian.org (full text, mbox, reply):

From: Michael Biebl <biebl@debian.org>

To: Christoph Anton Mitterer <calestyo@scientia.net>, 784596-done@bugs.debian.org

Subject: Re: Bug#784596: systemd: missing or legacy subuid/subgid entries

Date: Thu, 07 May 2015 02:49:07 +0200

[Message part 1 (text/plain, inline)]

Am 07.05.2015 um 02:40 schrieb Christoph Anton Mitterer:
> Package: systemd
> Version: 215-17
> Severity: normal
> 
> 
> Hey.
> 
> I was running some tests on the differences between a systemd
> that was kept constantly at sid level and such that was upgraded
> from wheezy to jessie.
> 
> During that I've noticed that /etc/subuid and /etc/subgid have
> entries like the following on the sid system:
> systemd-timesync:165536:65536
> systemd-network:231072:65536
> systemd-resolve:296608:65536
> systemd-bus-proxy:362144:65536
> 
> whereas the jessie system doesn't have.
> 
> Both run obviously with systemd and since the version of systemd
> is the same in jessie and sid I'd have assumed that the files
> would have either both these entries or neither of them.
> 
> 
> So maybe this is either a case of:
> - something's missing in jessie (why?)
> or
> - something's to much in my sid installation (which would then smell
>   after legacy stuff from an intermediate version that hasn't been
>   cleaned up properly.
> 
> 
> In any cases, this is the pointer for you maintainers, since you have
> probably a better clue than I do :-)
> 

You should direct those questions to the adduser maintainer.
Those files are not managed by systemd.

-- 
Why is it that all of the instruments seeking intelligent life in the
universe are pointed away from Earth?

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Message #15 received at 784596@bugs.debian.org (full text, mbox, reply):

From: Christoph Anton Mitterer <calestyo@scientia.net>

To: Michael Biebl <biebl@debian.org>

Cc: 784596@bugs.debian.org

Subject: Re: Bug#784596: systemd: missing or legacy subuid/subgid entries

Date: Thu, 07 May 2015 02:55:09 +0200

[Message part 1 (text/plain, inline)]

Control: reassign -1 adduser
Control: reopen -1 
Control: retitle -1 adduser: missing or legacy subuid/subgid entries for some users/groups

On Thu, 2015-05-07 at 02:49 +0200, Michael Biebl wrote: 
> You should direct those questions to the adduser maintainer.
> Those files are not managed by systemd.
Then it's probably better to reassign than to close, isn't it?!

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Message #28 received at 784596@bugs.debian.org (full text, mbox, reply):

From: Michael Biebl <biebl@debian.org>

To: Christoph Anton Mitterer <calestyo@scientia.net>, 784596@bugs.debian.org

Subject: Re: Bug#784596: systemd: missing or legacy subuid/subgid entries

Date: Thu, 07 May 2015 02:58:11 +0200

[Message part 1 (text/plain, inline)]

Am 07.05.2015 um 02:55 schrieb Christoph Anton Mitterer:
> Control: reassign -1 adduser
> Control: reopen -1 
> Control: retitle -1 adduser: missing or legacy subuid/subgid entries for some users/groups
> 
> On Thu, 2015-05-07 at 02:49 +0200, Michael Biebl wrote: 
>> You should direct those questions to the adduser maintainer.
>> Those files are not managed by systemd.
> Then it's probably better to reassign than to close, isn't it?!

I don't see a bug here. But whatever.


-- 
Why is it that all of the instruments seeking intelligent life in the
universe are pointed away from Earth?

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Message #33 received at 784596-done@bugs.debian.org (full text, mbox, reply):

From: Michael Biebl <biebl@debian.org>

To: Christoph Anton Mitterer <calestyo@scientia.net>, 784596-done@bugs.debian.org

Subject: Re: Bug#784596: systemd: missing or legacy subuid/subgid entries

Date: Thu, 07 May 2015 02:57:33 +0200

[Message part 1 (text/plain, inline)]

Am 07.05.2015 um 02:49 schrieb Michael Biebl:
> Am 07.05.2015 um 02:40 schrieb Christoph Anton Mitterer:

>> So maybe this is either a case of:
>> - something's missing in jessie (why?)
>> or
>> - something's to much in my sid installation (which would then smell
>>   after legacy stuff from an intermediate version that hasn't been
>>   cleaned up properly.
>>
>>
>> In any cases, this is the pointer for you maintainers, since you have
>> probably a better clue than I do :-)
>>
> 
> You should direct those questions to the adduser maintainer.
> Those files are not managed by systemd.

Or rather the passwd maintainers:

   [ Micah Anderson ]
  * added debian/patches/userns to enable use of subuids, plus some bugfix»
    patches on top of them, patches from Eric Biederman, pulled from
    Ubuntu. Closes: #739981
  * Allow LXC devices (lxc/console, lxc/tty[1234]) in securetty.linux
  * Update documentation of UMASK: Explain that USERGROUPS_ENAB will modify
    this default for UPGs. (Closes: #583971)
  * login.postinst: install a default /etc/subuid and /etc/subgid
  * fix installation of setuid/setgid/newuidmap/newgid/map man pages

Anyway, not systemd specific.

-- 
Why is it that all of the instruments seeking intelligent life in the
universe are pointed away from Earth?

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Message #38 received at 784596@bugs.debian.org (full text, mbox, reply):

From: Christoph Anton Mitterer <calestyo@scientia.net>

To: 784596@bugs.debian.org

Subject: Re: Bug#784596: systemd: missing or legacy subuid/subgid entries

Date: Thu, 07 May 2015 03:20:05 +0200

[Message part 1 (text/plain, inline)]

Control: reopen -1
Control: reassign -1 passwd
Control: retitle -1 missing or legacy subuid/subgid entries

On Thu, 2015-05-07 at 02:58 +0200, Michael Biebl wrote: 
> I don't see a bug here. But whatever.
Well normally we try to keep Debian clean and consistent , which is why
we remove legacy config files, do away with users/groups on purge etc.


>It has been closed by Michael Biebl <biebl@debian.org>.
You're MUA's reply button automatically closes a bug each time you hit
it, doesn't it?! o.O

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Message #49 received at 784596@bugs.debian.org (full text, mbox, reply):

From: Christoph Anton Mitterer <calestyo@scientia.net>

To: 784596@bugs.debian.org

Subject: Re: missing or legacy subuid/subgid entries

Date: Thu, 07 May 2015 03:29:31 +0200

[Message part 1 (text/plain, inline)]

The reason for these discrepancies is probably simply that passwd/login
were upgraded after systemd as it seems.

Which leaves however the question open:
Shouldn't there be some code or whatsoever to add sub[u|g]id entries for
legacy users?
And if this isn't needed anyway,... why having it?


Cheers,
Chris

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Message #54 received at 784596@bugs.debian.org (full text, mbox, reply):

From: ebiederm@xmission.com (Eric W. Biederman)

To: Christoph Anton Mitterer <calestyo@scientia.net>

Cc: 784596@bugs.debian.org

Subject: Re: [Pkg-shadow-devel] Bug#784596: missing or legacy subuid/subgid entries

Date: Wed, 20 May 2015 12:01:17 -0500

Christoph Anton Mitterer <calestyo@scientia.net> writes:

> The reason for these discrepancies is probably simply that passwd/login
> were upgraded after systemd as it seems.
>
> Which leaves however the question open:
> Shouldn't there be some code or whatsoever to add sub[u|g]id entries for
> legacy users?
> And if this isn't needed anyway,... why having it?

There should be code in usermod to add subuid and subgid entries to
existing users.  There certainly was at the time the code was written.

If the upgrade process uses that functionality I leave up to the
packagers.

The functionality is very useful in combination with newuidmap and and
newgidmap for the creation of unprivileged containers.  If you are not
using those there is not much point.  So it seems reasonable to be a
something that can be set per system.

Not changing existing users sounds like a good default as it does not
break existing assumptions.  Then for the people who care you can just
use usermod and add those ids.

Eric

Message #59 received at 784596@bugs.debian.org (full text, mbox, reply):

From: Jan Hudec <bulb@ucw.cz>

To: 784596@bugs.debian.org

Subject: [passwd]

Date: Wed, 19 Aug 2015 12:36:34 +0200

Package: passwd
Version: 1:4.2-3

--- Please enter the report below this line. ---

Currently in my system none of the user accounts have subuids, because they 
were created before subuid support was added, but a bunch of system accounts 
do have them despite being really unlikely to ever need them.

So I think there are two changes to consider:

 - Don't create subuids for system users (the 100-999 range) unless explicitly 
requested. Or is this adduser issue?

   It is not really interfering with anything, but it is unnecessarily using 
up the subuid space and for reliability it is better to force the packages 
that need them to ask for them explicitly.

 - Create subuids for real users (the 1000-60000 range) that don't have them, 
once during upgrade.

   The users can add the subuids for them if they want, but:

    - There does not seem to be a command to just “give me the default 
subuid+subgid range”, so the user has to come up with the right magic 
incantation and
    - This will lead to some tools just working on new installations and not 
working on older installations that have been upgraded for some time, which 
may lead to confusion and the reason may not be immediately obvious.

Thanks,
Jan

-- 
 - Jan Hudec <bulb@ucw.cz>

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