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* [gentoo-user] Is there a way to automate rsync of updated portage tree across multiple boxes without each having to pull it down from a gentoo mirror
@ 2008-09-15 14:09 Michael Sullivan
  2008-09-15 14:17 ` Alan McKinnon
  2008-09-15 14:54 ` Aniruddha
  0 siblings, 2 replies; 35+ messages in thread
From: Michael Sullivan @ 2008-09-15 14:09 UTC (permalink / raw
  To: gentoo-user

I've got three PCs.  I want to only have to have one run emerge --sync,
but for the box running the emerge --sync to be able to rsync the tree
to the other two boxes automatically (like in the middle of the night
while I'm asleep).  Is there a way to do this?  The problem with my
theories on how to do this fall apart when I get to the part where a
password has to be entered for rsync/scp.  I used to do this with NFS,
but the box that will be running emerge --sync has a history of locking
up if there is more than one semi-heavy process going on it at a time,
so I want each box to have its own copy of the tree.  Is there a way to
do this?




^ permalink raw reply	[flat|nested] 35+ messages in thread

* Re: [gentoo-user] Is there a way to automate rsync of updated portage tree across multiple boxes without each having to pull it down from a gentoo mirror
  2008-09-15 14:09 Michael Sullivan
@ 2008-09-15 14:17 ` Alan McKinnon
  2008-09-15 14:31   ` Michael Sullivan
  2008-09-15 14:54 ` Aniruddha
  1 sibling, 1 reply; 35+ messages in thread
From: Alan McKinnon @ 2008-09-15 14:17 UTC (permalink / raw
  To: gentoo-user

On Monday 15 September 2008 16:09:42 Michael Sullivan wrote:
> Is there a way to do this?  The problem with my
> theories on how to do this fall apart when I get to the part where a
> password has to be entered for rsync/scp.

ssh keys.

To avoid running more than one sync at a time, have the clients pull the tree 
from the server in a cron spaced 30 minutes or an hour apart. Make sure you 
pull the entire tree, and if you use eix to run update-eix afterwards on the 
clients



-- 
alan dot mckinnon at gmail dot com



^ permalink raw reply	[flat|nested] 35+ messages in thread

* Re: [gentoo-user] Is there a way to automate rsync of updated portage tree across multiple boxes without each having to pull it down from a gentoo mirror
  2008-09-15 14:17 ` Alan McKinnon
@ 2008-09-15 14:31   ` Michael Sullivan
  2008-09-15 14:41     ` Alan McKinnon
  0 siblings, 1 reply; 35+ messages in thread
From: Michael Sullivan @ 2008-09-15 14:31 UTC (permalink / raw
  To: gentoo-user

On Mon, 2008-09-15 at 16:17 +0200, Alan McKinnon wrote:
> On Monday 15 September 2008 16:09:42 Michael Sullivan wrote:
> > Is there a way to do this?  The problem with my
> > theories on how to do this fall apart when I get to the part where a
> > password has to be entered for rsync/scp.
> 
> ssh keys.
> 
> To avoid running more than one sync at a time, have the clients pull the tree 
> from the server in a cron spaced 30 minutes or an hour apart. Make sure you 
> pull the entire tree, and if you use eix to run update-eix afterwards on the 
> clients
> 
> 
> 

Create ssh keys without passphrases?  That's not recommended...




^ permalink raw reply	[flat|nested] 35+ messages in thread

* Re: [gentoo-user] Is there a way to automate rsync of updated portage tree across multiple boxes without each having to pull it down from a gentoo mirror
  2008-09-15 14:31   ` Michael Sullivan
@ 2008-09-15 14:41     ` Alan McKinnon
  2008-09-15 21:34       ` Neil Bothwick
  0 siblings, 1 reply; 35+ messages in thread
From: Alan McKinnon @ 2008-09-15 14:41 UTC (permalink / raw
  To: gentoo-user

On Monday 15 September 2008 16:31:45 Michael Sullivan wrote:
> On Mon, 2008-09-15 at 16:17 +0200, Alan McKinnon wrote:
> > On Monday 15 September 2008 16:09:42 Michael Sullivan wrote:
> > > Is there a way to do this?  The problem with my
> > > theories on how to do this fall apart when I get to the part where a
> > > password has to be entered for rsync/scp.
> >
> > ssh keys.
> >
> > To avoid running more than one sync at a time, have the clients pull the
> > tree from the server in a cron spaced 30 minutes or an hour apart. Make
> > sure you pull the entire tree, and if you use eix to run update-eix
> > afterwards on the clients
>
> Create ssh keys without passphrases?  That's not recommended...

True, but it's infinitely better than a passwordless account. You did say that 
you want an automated rsync/scp solution, that precludes setting up an rsync 
server. I don't see that any other realistic options exist.

-- 
alan dot mckinnon at gmail dot com



^ permalink raw reply	[flat|nested] 35+ messages in thread

* Re: [gentoo-user] Is there a way to automate rsync of updated portage tree across multiple boxes without each having to pull it down from a gentoo mirror
  2008-09-15 14:09 Michael Sullivan
  2008-09-15 14:17 ` Alan McKinnon
@ 2008-09-15 14:54 ` Aniruddha
  1 sibling, 0 replies; 35+ messages in thread
From: Aniruddha @ 2008-09-15 14:54 UTC (permalink / raw
  To: gentoo-user

On Mon, 2008-09-15 at 09:09 -0500, Michael Sullivan wrote:
> I've got three PCs.  I want to only have to have one run emerge --sync,
> but for the box running the emerge --sync to be able to rsync the tree
> to the other two boxes automatically (like in the middle of the night
> while I'm asleep).  Is there a way to do this?  The problem with my
> theories on how to do this fall apart when I get to the part where a
> password has to be entered for rsync/scp.  I used to do this with NFS,
> but the box that will be running emerge --sync has a history of locking
> up if there is more than one semi-heavy process going on it at a time,
> so I want each box to have its own copy of the tree.  Is there a way to
> do this?

Just setup two boxes to rsync to you primary "emerge --sync box" using
cron. See: http://www.gentoo.org/doc/en/rsync.xml

Regards,

Aniruddha





^ permalink raw reply	[flat|nested] 35+ messages in thread

* Re: [gentoo-user] Is there a way to automate rsync of updated  portage tree across multiple boxes without each having to pull it down from a gentoo mirror
       [not found]   ` <bcnpk-3XO-13@gated-at.bofh.it>
@ 2008-09-15 16:01     ` Vaeth
  0 siblings, 0 replies; 35+ messages in thread
From: Vaeth @ 2008-09-15 16:01 UTC (permalink / raw
  To: gentoo-user


On Mon, 15 Sep 2008, Michael Sullivan wrote:
> On Mon, 2008-09-15 at 16:17 +0200, Alan McKinnon wrote:
> > On Monday 15 September 2008 16:09:42 Michael Sullivan wrote:
> > > Is there a way to do this?  The problem with my
> > > theories on how to do this fall apart when I get to the part where a
> > > password has to be entered for rsync/scp.
> > 
> > ssh keys. [...]
> Create ssh keys without passphrases?  That's not recommended...

It depends: If you use these keys for nothing else than to login to
your "server" machine (to fetch the portage tree) (and of course if
you keep the key readable only for the cron-job on the client) then
the only risk you have is: If the client (or the user for the cron-job)
gets compromised then also the server might get compromised/spied to some
extend (depending on which permissions allows the server to the account
which you use for syncing, i.e. which is accepting the corresponding
ssh key).

But this risk is always there, no matter which approach you choose...

An alternative - if you really just want to use keys with a passphrase -
is to use net-misc/keychain. Of course, this means that you have to
(manually) enter the passphrase at least once after booting or otherwise
your cron-job will fail.

> > and if you use eix to run update-eix afterward

I would even recommend to use eix-sync to do all in the correct order:
Call it on the client side with option "-s user@server[:dir]"
(or put the line with this option into /etc/eix-sync.conf if you want
to use this option practically always); this supports even keychain:
Put e.g. the line
~keychain --quiet ~/.ssh/id_rsa ; cat ~/.keychain/"$(hostname)-sh"
into /etc/eix-sync.conf; see the eix manpage and eix-sync -h for details).

An alternative might be to use option "-2 ..." on the server side,
but this supports currently _one_ client and requires that eix-sync -u
(or at least update-eix) is called afterwards on the client side.



^ permalink raw reply	[flat|nested] 35+ messages in thread

* Re: [gentoo-user] Is there a way to automate rsync of updated portage tree across multiple boxes without each having to pull it down from a gentoo mirror
  2008-09-15 14:41     ` Alan McKinnon
@ 2008-09-15 21:34       ` Neil Bothwick
  2008-09-16  6:42         ` Alan McKinnon
  0 siblings, 1 reply; 35+ messages in thread
From: Neil Bothwick @ 2008-09-15 21:34 UTC (permalink / raw
  To: gentoo-user

[-- Attachment #1: Type: text/plain, Size: 592 bytes --]

On Mon, 15 Sep 2008 16:41:05 +0200, Alan McKinnon wrote:

> True, but it's infinitely better than a passwordless account. You did
> say that you want an automated rsync/scp solution, that precludes
> setting up an rsync server. I don't see that any other realistic
> options exist.

Why does it preclude an rsync server? What wrong with running an rsync
server with a suitable "host allow" in the config? That would allow local
connections only without the need for passwords or keys.


-- 
Neil Bothwick

"Bad dog! Leave that wire alone.....click.....###@*##....NO TERRIER


[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 197 bytes --]

^ permalink raw reply	[flat|nested] 35+ messages in thread

* Re: [gentoo-user] Is there a way to automate rsync of updated portage tree across multiple boxes without each having to pull it down from a gentoo mirror
  2008-09-15 21:34       ` Neil Bothwick
@ 2008-09-16  6:42         ` Alan McKinnon
  0 siblings, 0 replies; 35+ messages in thread
From: Alan McKinnon @ 2008-09-16  6:42 UTC (permalink / raw
  To: gentoo-user

On Monday 15 September 2008 23:34:43 Neil Bothwick wrote:
> On Mon, 15 Sep 2008 16:41:05 +0200, Alan McKinnon wrote:
> > True, but it's infinitely better than a passwordless account. You did
> > say that you want an automated rsync/scp solution, that precludes
> > setting up an rsync server. I don't see that any other realistic
> > options exist.
>
> Why does it preclude an rsync server? 

No good technical reason. I inferred from the OP's original mail that he 
wanted to use plain rsync or scp and his intention was not to set up an rsync 
server

> What wrong with running an rsync 
> server with a suitable "host allow" in the config? That would allow local
> connections only without the need for passwords or keys.

That is indeed the preferred way

-- 
alan dot mckinnon at gmail dot com



^ permalink raw reply	[flat|nested] 35+ messages in thread

* Re: [gentoo-user] Is there a way to automate rsync of updated portage tree across multiple boxes without each having to pull it down from a gentoo mirror
       [not found]     ` <bcCxX-7bd-9@gated-at.bofh.it>
@ 2008-09-16  7:29       ` Vaeth
  2008-09-16 10:16         ` Neil Bothwick
  0 siblings, 1 reply; 35+ messages in thread
From: Vaeth @ 2008-09-16  7:29 UTC (permalink / raw
  To: gentoo-user


> > What wrong with running an rsync 
> > server with a suitable "host allow" in the config? That would allow local
> > connections only without the need for passwords or keys.
> 
> That is indeed the preferred way

It is much more dangerous than the ssh approach: It is not so hard to
fake an IP (unless you local net ist physically separated) but it is
close to impossible to fake an ssh key without compromising the machine
holding it.



^ permalink raw reply	[flat|nested] 35+ messages in thread

* Re: [gentoo-user] Is there a way to automate rsync of updated portage  tree across multiple boxes without each having to pull it down from a gentoo  mirror
  2008-09-16  7:29       ` Vaeth
@ 2008-09-16 10:16         ` Neil Bothwick
  2008-09-16 10:49           ` Etaoin Shrdlu
  0 siblings, 1 reply; 35+ messages in thread
From: Neil Bothwick @ 2008-09-16 10:16 UTC (permalink / raw
  To: gentoo-user

[-- Attachment #1: Type: text/plain, Size: 21774 bytes --]

On Tue, 16 Sep 2008 09:29:59 +0200 (CEST), Vaeth wrote:

> > > What wrong with running an rsync 
> > > server with a suitable "host allow" in the config? That would allow
> > > local connections only without the need for passwords or keys.  
> > 
> > That is indeed the preferred way  
> 
> It is much more dangerous than the ssh approach: It is not so hard to
> fake an IP (unless you local net ist physically separated) but it is
> close to impossible to fake an ssh key without compromising the machine
> holding it.

Leaving aside the difficulties of faking a LAN IP from the public side
of the router, or even the fact that the router may have the rsync ports
closed, what is so secret about the contents of the portage tree?


-- 
Neil Bothwick

Feminism: the radical notion that women are people.
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you are talking about.
Neil Bothwick

New Klingon hair salon: "Today is a good day to dye"
Neil Bothwick

Shotgun wedding: A case of wife or death.
Neil Bothwick

Top Oxymorons Number 32: Living dead
Neil Bothwick

"Bother," said Pooh, when he found Tigger stoned on his hash
Neil Bothwick

Where do you think you're going today?
Neil Bothwick

 Q:  How does a Zen Master order a hot dog?
 A: "Make me one with everything."
Neil Bothwick

I just took an IQ test. The results were negative.
Neil Bothwick

Soooo... We are in Law Enforcment. -Worf-
Neil Bothwick

I am Barney of Borg: I love you. You love me. We're a happy Borg.
Neil Bothwick

I don't know if I can assimilate one more Borg Tagline!
Neil Bothwick

--T-A+G-L-I+N-E--+M-E-A+S-U-R+I-N-G+--G-A+U-G-E--
Neil Bothwick

I don't work here. I'm a consultant.
Neil Bothwick

DOS: Defunct Operating System
Neil Bothwick

A friend in need may turn out to be a nuisance.
Neil Bothwick

User-friendly: (adj.) trivialized, slow, incapable, and boring.
Neil Bothwick

He who laughs last probably made a back-up.
Neil Bothwick

If you think that there is good in everybody, you haven't met everybody.
Neil Bothwick

"He's dead, Jim.  You get his phaser, I'll grab his wallet."
Neil Bothwick

Of course it's not your day,
Neil Bothwick

Windows '96 artificial intelligence: Cant Compress Hard Drive but dont
worry I'll delete all files over size 50,000 that'll give you some space.
Neil Bothwick

Those who live by the sword get shot by those who don't.",
Neil Bothwick

Gotta run, cat's caught in the printer...
Neil Bothwick

Hello.. Incontinence Hotline.. Can you hold?
Neil Bothwick

How do a fool and his money GET together?
Neil Bothwick

Unsolicited advice is the junk mail of life
Neil Bothwick

If you think the problem is bad now, just wait until we've solved it.
Neil Bothwick

EMail - garbage at the speed of light.
Neil Bothwick

User-friendly: (adj.) trivialized, slow, incapable, and boring.
Neil Bothwick

Sir! Romulan warbird decloaki»®õ÷üÁ NO CARRIER
Neil Bothwick

Windows will never cease.
Neil Bothwick

If someone with multiple personalities threatens to kill himself, is it
considered a hostage situation?
Neil Bothwick

Windows '96 artificial intelligence: Unable to FORMAT A: Having a go at C:
Neil Bothwick

Few women admit their age. Few men act theirs.
Neil Bothwick

An example of hard water is ice.
Neil Bothwick

Captain, I believe there's an energy source in the liver of the cloud.
Neil Bothwick

Ad - Save regularly in our bank. You'll never reget it.
Neil Bothwick

Don't use a long word if a diminutive one will do.
Neil Bothwick

Top Oxymorons Number 16: Peace force
Neil Bothwick

New sig wanted good price paid.
Neil Bothwick

COBOL: Completely Obsolete Business Oriented Language
Neil Bothwick

I'm Bugs Bunny of Borg.  What's up Collective?
Neil Bothwick

Loose bits sink chips.
Neil Bothwick

"Bother," said Pooh, when his spliff went out.
Neil Bothwick

"Mr. Worf, scan that ship." "Aye Captain. 300 dpi?"
Neil Bothwick

But I thought YOU did the backups...
Neil Bothwick

"Bother," said Christopher Robin, as Pooh got out the vaseline.
Neil Bothwick

Just got a new car for my wife....Great Trade!
Neil Bothwick

Everywhere is walking distance if you have the time.
Neil Bothwick

"When you play a Microsoft CD backwards you can hear demonic Voices...
that's nothing - when you play it forward it installs Windows"
Neil Bothwick

Drop your carrier .. we have you surrounded
Neil Bothwick

Why do kamikaze pilots wear helmets?
Neil Bothwick

Top Oxymorons Number 2: Exact estimate
Neil Bothwick

I work with User-Surly Software.
Neil Bothwick

Never argue with an idiot. First, they bring you down to their level.
Then they beat you with experience.
Neil Bothwick

"Bother," said Pooh, as the vice squad took his GIFS
Neil Bothwick

"There are no stupid questions, just too many inquisitive idiots."
Neil Bothwick

Velilind's Laws of Experimentation:
1. If reproducibility may be a problem, conduct the test only once.
2. If a straight line fit is required, obtain only two data points.
Neil Bothwick

Age and treachery will always overcome youth and skill.
Neil Bothwick

Don't forget that MS-Windows is just a temporary workaround until you can
switch to a GNU system.
Neil Bothwick

How is it that we put man on the moon before we figured out it would be a
good idea to put wheels on luggage?
Neil Bothwick

ERROR #0915: MONITOR NOT PRESENT. CLICK ON OK TO CONTINUE.
Neil Bothwick

If you catch an exploding manhole cover, you can keep it.
Neil Bothwick

To err is human; to really foul things up requires a computer.
Neil Bothwick

If you only have a hammer, you tend to see every problem as a nail. *
Maslow Neil Bothwick

Windows - so intuitive you only need a meg of help files!
Neil Bothwick

Did you know that eskimos have 17 different words for linguist?
Neil Bothwick

I just got lost in thought. It was unfamiliar territory.
Neil Bothwick

After two weeks of dieting, all I lost was two weeks.
Neil Bothwick

Someone who thinks logically is a nice contrast to the real world.
Neil Bothwick

BUFFERS=20 FILES=15 2nd down, 4th quarter, 5 yards to go!
Neil Bothwick

A phaser is the universal communicator. þ Worf
Neil Bothwick

What did the first man to discover you can get milk from cows think he
was doing? - anon.
Neil Bothwick

Those who can, do. Those who cannot, teach. Those who cannot teach, HACK!
Neil Bothwick

Everywhere is walking distance if you have the time.
Neil Bothwick

Stupidity is NOT a handicap. You'll have to park elsewhere.
Neil Bothwick

Programmers do it bit by bit.
Neil Bothwick

Deliver a pizza? Whoever heard of a liver pizza?
Neil Bothwick

If it ain't broke, break it and charge for repair.
Neil Bothwick

"How long is this Beta guy going to keep testing our stuff?"

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^ permalink raw reply	[flat|nested] 35+ messages in thread

* Re: [gentoo-user] Is there a way to automate rsync of updated portage  tree across multiple boxes without each having to pull it down from a gentoo  mirror
  2008-09-16 10:16         ` Neil Bothwick
@ 2008-09-16 10:49           ` Etaoin Shrdlu
  2008-09-16 11:49             ` Iain Buchanan
  0 siblings, 1 reply; 35+ messages in thread
From: Etaoin Shrdlu @ 2008-09-16 10:49 UTC (permalink / raw
  To: gentoo-user

On Tuesday 16 September 2008, 12:16, Neil Bothwick wrote:

[snip]

Uhm...something bad probably happened while the signature was appended to 
the message :-)



^ permalink raw reply	[flat|nested] 35+ messages in thread

* Re: [gentoo-user] Is there a way to automate rsync of updated  portage  tree across multiple boxes without each having to pull it down  from a gentoo  mirror
       [not found]         ` <bcFPc-3e4-7@gated-at.bofh.it>
@ 2008-09-16 11:49           ` Vaeth
  2008-09-16 13:24             ` Neil Bothwick
  0 siblings, 1 reply; 35+ messages in thread
From: Vaeth @ 2008-09-16 11:49 UTC (permalink / raw
  To: gentoo-user


Neil Bothwick wrote:

> On Tue, 16 Sep 2008 09:29:59 +0200 (CEST), Vaeth wrote:
> 
> > > > What wrong with running an rsync
> > > > server with a suitable "host allow" in the config? [...]
> > > 
> > > That is indeed the preferred way  
> > 
> > It is much more dangerous than the ssh approach [...]
> 
> Leaving aside the difficulties of faking a LAN IP from the public side
> of the router, or even the fact that the router may have the rsync ports
> closed, what is so secret about the contents of the portage tree?

It is always better to have a port not open than to rely on a router
to "close" it apparently.
Moreover, who can guarantee you that the portage tree is the only thing
which is possible to see with a faked IP: Every program might have
vulnerabilities, so the less you provide to the outside world
(even if visible only through IP faking) the more secure you are.
Probably, sshd is needed anyway, so if possible this should be the only
thing potentially visible from the outside.



^ permalink raw reply	[flat|nested] 35+ messages in thread

* Re: [gentoo-user] Is there a way to automate rsync of updated portage tree across multiple boxes without each having to pull it down from a gentoo mirror
  2008-09-16 10:49           ` Etaoin Shrdlu
@ 2008-09-16 11:49             ` Iain Buchanan
  2008-09-16 13:21               ` Neil Bothwick
  0 siblings, 1 reply; 35+ messages in thread
From: Iain Buchanan @ 2008-09-16 11:49 UTC (permalink / raw
  To: gentoo-user

Etaoin Shrdlu wrote:
> On Tuesday 16 September 2008, 12:16, Neil Bothwick wrote:
>
> [snip]
>
> Uhm...something bad probably happened while the signature was appended to
> the message :-)
>

probably missed a few delimiters there in his home-spun fortune file!

Hey Neil, you didn't come up with all those attributed to you, did you?

-- 
Iain Buchanan <iaindb at netspace dot net dot au>

"We ought to make the pie higher."

George W. Bush
February 15, 2000
Comment made in Columbia, South Carolina during presidential campaign.



^ permalink raw reply	[flat|nested] 35+ messages in thread

* Re: [gentoo-user] Is there a way to automate rsync of updated portage   tree across multiple boxes without each having to pull it down from a gentoo   mirror
  2008-09-16 11:49             ` Iain Buchanan
@ 2008-09-16 13:21               ` Neil Bothwick
  0 siblings, 0 replies; 35+ messages in thread
From: Neil Bothwick @ 2008-09-16 13:21 UTC (permalink / raw
  To: gentoo-user

[-- Attachment #1: Type: text/plain, Size: 620 bytes --]

On Tue, 16 Sep 2008 21:19:44 +0930, Iain Buchanan wrote:

> > Uhm...something bad probably happened while the signature was
> > appended to the message :-)
> >  
> 
> probably missed a few delimiters there in his home-spun fortune file!

Except I haven't changed the file lately. Either my tagline file is
corrupted or a recent update has broken signify. This has happened a few
times recently, but I didn't catch this one.

> Hey Neil, you didn't come up with all those attributed to you, did you?

Of course I did! ;-)


-- 
Neil Bothwick

Ifyoucanreadthis,youspendtoomuchtimefiguringouttaglines.

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^ permalink raw reply	[flat|nested] 35+ messages in thread

* Re: [gentoo-user] Is there a way to automate rsync of updated   portage  tree across multiple boxes without each having to pull it down   from a gentoo  mirror
  2008-09-16 11:49           ` Vaeth
@ 2008-09-16 13:24             ` Neil Bothwick
  0 siblings, 0 replies; 35+ messages in thread
From: Neil Bothwick @ 2008-09-16 13:24 UTC (permalink / raw
  To: gentoo-user

[-- Attachment #1: Type: text/plain, Size: 668 bytes --]

On Tue, 16 Sep 2008 13:49:36 +0200 (CEST), Vaeth wrote:

> > Leaving aside the difficulties of faking a LAN IP from the public side
> > of the router, or even the fact that the router may have the rsync
> > ports closed, what is so secret about the contents of the portage
> > tree?  
> 
> It is always better to have a port not open than to rely on a router
> to "close" it apparently.

If you are using NAT on the router, you have to explicitly forward that
port somewhere for it to work. I use an rsync server on my network, but it
is inaccessible from the Internet.


-- 
Neil Bothwick

Guns don't kill people--it's those little pieces of lead.

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^ permalink raw reply	[flat|nested] 35+ messages in thread

* Re: [gentoo-user] Is there a way to automate rsync of updated    portage  tree across multiple boxes without each having to pull it down    from a gentoo  mirror
       [not found]             ` <bcINa-6Yt-7@gated-at.bofh.it>
@ 2008-09-16 15:29               ` Vaeth
  2008-09-16 15:59                 ` Neil Bothwick
  0 siblings, 1 reply; 35+ messages in thread
From: Vaeth @ 2008-09-16 15:29 UTC (permalink / raw
  To: gentoo-user

On Tue, 16 Sep 2008, Neil Bothwick wrote:

> On Tue, 16 Sep 2008 13:49:36 +0200 (CEST), Vaeth wrote:
> 
> > It is always better to have a port not open than to rely on a router
> > to "close" it apparently.
> 
> If you are using NAT on the router, you have to explicitly forward that
> port somewhere for it to work. [...]

Except that this is not completely true: See some of the many articles
in the net which explain why NAT is not a security feature. A quick google
search gave e.g. http://www.nexusuk.org/articles/2005/03/12/nat_security/



^ permalink raw reply	[flat|nested] 35+ messages in thread

* Re: [gentoo-user] Is there a way to automate rsync of updated     portage  tree across multiple boxes without each having to pull it down    from a gentoo  mirror
  2008-09-16 15:29               ` [gentoo-user] Is there a way to automate rsync of updated portage tree across multiple boxes without each having to pull it down from a gentoo mirror Vaeth
@ 2008-09-16 15:59                 ` Neil Bothwick
  2008-09-16 17:18                   ` Matthias Bethke
  0 siblings, 1 reply; 35+ messages in thread
From: Neil Bothwick @ 2008-09-16 15:59 UTC (permalink / raw
  To: gentoo-user

[-- Attachment #1: Type: text/plain, Size: 1288 bytes --]

On Tue, 16 Sep 2008 17:29:16 +0200 (CEST), Vaeth wrote:

> > If you are using NAT on the router, you have to explicitly forward
> > that port somewhere for it to work. [...]  
> 
> Except that this is not completely true: See some of the many articles
> in the net which explain why NAT is not a security feature. A quick
> google search gave e.g.
> http://www.nexusuk.org/articles/2005/03/12/nat_security/
> 

"So the router maintains a database of current connections so that traffic
is always allowed through for them, and you can tell it to filter all new
connections made from the internet whilest allowing all new connections
made from inside the local network. This means that noone can make a
connection from the internet to one of your workstations, even though
they can route to its address."

If the relevant ports are not forwarded in the router, this applies and
no one can make a new connection to your rsync server.

In addition, the default rsyncd configuration with Gentoo uses a chroot
jail. So even if you do allow connections to your portage tree, they
won't be able to access anything else. After all, isn't that exactly how
Gentoo mirrors work?


-- 
Neil Bothwick

There is absolutely no substitute for a genuine lack of preparation.

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^ permalink raw reply	[flat|nested] 35+ messages in thread

* Re: [gentoo-user] Is there a way to automate rsync of updated      portage  tree across multiple boxes without each having to pull it down    from a gentoo  mirror
       [not found]                 ` <bcLhW-1SC-25@gated-at.bofh.it>
@ 2008-09-16 17:14                   ` Vaeth
  2008-09-16 17:29                     ` Matthias Bethke
       [not found]                   ` <bcMnJ-3fg-29@gated-at.bofh.it>
  1 sibling, 1 reply; 35+ messages in thread
From: Vaeth @ 2008-09-16 17:14 UTC (permalink / raw
  To: gentoo-user

Neil Bothwick wrote:

> On Tue, 16 Sep 2008 17:29:16 +0200 (CEST), Vaeth wrote:
> 
> > > If you are using NAT on the router, you have to explicitly forward
> > > that port somewhere for it to work. [...]  
> > 
> > Except that this is not completely true [...]
> 
> "So the router maintains a database of current connections

This is not true for a standard NAT router. Only special routers with
additional functionality can do this. Not to mention that occassionally
also bugs in the implementations of such routers are found (e.g. using
DOS to attempt a database overflow is an attack which comes to mind in
the "generic" case).
In any case, it depends on how much you can trust the router, while if
the  port is not open on your machine you do not have such a risk at
all. So why take an unnecessary risk?

> In addition, the default rsyncd configuration with Gentoo uses a chroot
> jail.

Also a chroot jail is not a security feature: There are several ways known
how to break out. Well, if you use grsecurity (hardened-sources), at least
the most gapping security holes are closed in this respect, but also this
is no guarantee and can hinder you when you have other uses for chroot.
Not to speak that rsyncd introduces additional code anyway,
which might also be vulnerable in an unexpected manner (e.g. in connection
with a kernel bug or who-knows-what).

> After all, isn't that exactly how Gentoo mirrors work?

If you offer something on the net you have certainly an increased
risk that the corresponding machine is compromised - every mirror
administrator is aware of this (or at least he should be so). But
there is no reason to take any such sort of risk in a network which
is not supposed to offer services to other people.



^ permalink raw reply	[flat|nested] 35+ messages in thread

* Re: [gentoo-user] Is there a way to automate rsync of updated portage  tree across multiple boxes without each having to pull it down from a gentoo  mirror
  2008-09-16 15:59                 ` Neil Bothwick
@ 2008-09-16 17:18                   ` Matthias Bethke
  0 siblings, 0 replies; 35+ messages in thread
From: Matthias Bethke @ 2008-09-16 17:18 UTC (permalink / raw
  To: gentoo-user

[-- Attachment #1: Type: text/plain, Size: 1341 bytes --]

Hi Neil,
on Tue, Sep 16, 2008 at 04:59:39PM +0100, you wrote:
> > Except that this is not completely true: See some of the many articles
> > in the net which explain why NAT is not a security feature. A quick
> > google search gave e.g.
> > http://www.nexusuk.org/articles/2005/03/12/nat_security/
> 
> "So the router maintains a database of current connections so that traffic
> is always allowed through for them, and you can tell it to filter all new
> connections made from the internet whilest allowing all new connections
> made from inside the local network. This means that noone can make a
> connection from the internet to one of your workstations, even though
> they can route to its address."
> 
> If the relevant ports are not forwarded in the router, this applies and
> no one can make a new connection to your rsync server.

I don't even see why you'd strictly need connection tracking to avoid
attacks made possible by grossly misconfigured ISP routers. Your router
knows that packets with a destination address of 10/8, 192.168/16 and
the like have absolutely no business on the public internet so the only
sensible behavior would be to just drop them.

cheers,
	Matthias
-- 
I prefer encrypted and signed messages. KeyID: FAC37665
Fingerprint: 8C16 3F0A A6FC DF0D 19B0  8DEF 48D9 1700 FAC3 7665

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^ permalink raw reply	[flat|nested] 35+ messages in thread

* Re: [gentoo-user] Is there a way to automate rsync of updated portage  tree across multiple boxes without each having to pull it down from a gentoo  mirror
  2008-09-16 17:14                   ` Vaeth
@ 2008-09-16 17:29                     ` Matthias Bethke
  2008-09-16 19:07                       ` Alan McKinnon
  0 siblings, 1 reply; 35+ messages in thread
From: Matthias Bethke @ 2008-09-16 17:29 UTC (permalink / raw
  To: gentoo-user

[-- Attachment #1: Type: text/plain, Size: 1030 bytes --]

Hi Vaeth,
on Tue, Sep 16, 2008 at 07:14:48PM +0200, you wrote:
> > In addition, the default rsyncd configuration with Gentoo uses a chroot
> > jail.
> 
> Also a chroot jail is not a security feature: There are several ways known
> how to break out.

Huh? In the case of NAT it's reasonable to say it's not a security
feature---it's a kludge that happens to increase security somewhat in
the standard case. But there's only one reason I can see why you'd use a
chroot environment *except* for security and that's to have more than
one set of system binaries active at the same time for different
applications. Which is normally a pretty bad kludge in itself (not that
I hadn't done it, to avoid endless library woes on a Debian system that
absolutely must be kept on Woody... :-S), I'd say the vast majority of
chroot jails are there for nothing else but security.

cheers,
	Matthias
-- 
I prefer encrypted and signed messages. KeyID: FAC37665
Fingerprint: 8C16 3F0A A6FC DF0D 19B0  8DEF 48D9 1700 FAC3 7665

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^ permalink raw reply	[flat|nested] 35+ messages in thread

* Re: [gentoo-user] Is there a way to automate rsync of updated  portage  tree across multiple boxes without each having to pull it  down from a gentoo  mirror
       [not found]                   ` <bcMnJ-3fg-29@gated-at.bofh.it>
@ 2008-09-16 17:54                     ` Vaeth
  2008-09-16 19:17                       ` Matthias Bethke
  0 siblings, 1 reply; 35+ messages in thread
From: Vaeth @ 2008-09-16 17:54 UTC (permalink / raw
  To: gentoo-user


On Tue, 16 Sep 2008, Matthias Bethke wrote:

> I don't even see why you'd strictly need connection tracking to avoid
> attacks made possible by grossly misconfigured ISP routers. Your router
> knows that packets with a destination address of 10/8, 192.168/16 and
> the like have absolutely no business on the public internet so the only
> sensible behavior would be to just drop them.

This also requires a special kind of router: Namely one which has a
physical way of distinguishing between the "dangerous" connection to
the net and your local network (if they are dynamic, this can also
sometimes be tricked). Of course, combined router/modems have this
separation practically "by definition". However, in any case it
requires that the functionality you mention is implemented on the
router and has no bugs and that the router cannot be compromised by
other means.



^ permalink raw reply	[flat|nested] 35+ messages in thread

* Re: [gentoo-user] Is there a way to automate rsync of updated  portage  tree across multiple boxes without each having to pull it  down from a gentoo  mirror
       [not found]                   ` <bcMH5-3z1-37@gated-at.bofh.it>
@ 2008-09-16 18:36                     ` Vaeth
  2008-09-16 22:51                       ` Matthias Bethke
  0 siblings, 1 reply; 35+ messages in thread
From: Vaeth @ 2008-09-16 18:36 UTC (permalink / raw
  To: gentoo-user


Matthias Bethke wrote:

> Hi Vaeth, [...]
> > 
> > Also a chroot jail is not a security feature: There are several
> > ways known how to break out.
> 
> [...] But there's only one reason I can see why you'd use a
> chroot environment *except* for security and that's to have more than
> one set of system binaries active at the same time for different
> applications.

Or simply several systems (e.g. amd64 and x86, or gentoo and debian,
or your boot disk and your newly installed system [the install handbook
makes massive use of chroot]). This is exactly what chroot was made for.

> I'd say the vast majority of chroot jails are there for nothing
> else but security.

Alan Cox: "chroot is not and never has been a security tool", see e.g.
http://kerneltrap.org/Linux/Abusing_chroot




^ permalink raw reply	[flat|nested] 35+ messages in thread

* Re: [gentoo-user] Is there a way to automate rsync of updated portage  tree across multiple boxes without each having to pull it down from a gentoo  mirror
  2008-09-16 17:29                     ` Matthias Bethke
@ 2008-09-16 19:07                       ` Alan McKinnon
  0 siblings, 0 replies; 35+ messages in thread
From: Alan McKinnon @ 2008-09-16 19:07 UTC (permalink / raw
  To: gentoo-user

On Tuesday 16 September 2008 19:29:21 Matthias Bethke wrote:
> I'd say the vast majority of
> chroot jails are there for nothing else but security.

Replace "security" with "warm fuzzy feeling of apparent security that actually 
doesn't exist" and you're close to the mark. The sole positive of using 
chroot like this is that (like NAT) it does happen to give a marginal 
increase in security at reasonably low cost.

There are much better solutions with real security benefits: vservers, BSD 
jails, etc, etc.

This is nto directed at you, I just seem to spend way too much time these days 
dispelling persistent myths that have taken hold in people's minds but have 
no real basis in fact

-- 
alan dot mckinnon at gmail dot com



^ permalink raw reply	[flat|nested] 35+ messages in thread

* Re: [gentoo-user] Is there a way to automate rsync of updated portage  tree across multiple boxes without each having to pull it down from a gentoo  mirror
  2008-09-16 17:54                     ` Vaeth
@ 2008-09-16 19:17                       ` Matthias Bethke
  0 siblings, 0 replies; 35+ messages in thread
From: Matthias Bethke @ 2008-09-16 19:17 UTC (permalink / raw
  To: gentoo-user

[-- Attachment #1: Type: text/plain, Size: 1567 bytes --]

Hi Vaeth,
on Tue, Sep 16, 2008 at 07:54:43PM +0200, you wrote:
> > I don't even see why you'd strictly need connection tracking to avoid
> > attacks made possible by grossly misconfigured ISP routers. Your router
> > knows that packets with a destination address of 10/8, 192.168/16 and
> > the like have absolutely no business on the public internet so the only
> > sensible behavior would be to just drop them.
> 
> This also requires a special kind of router: Namely one which has a
> physical way of distinguishing between the "dangerous" connection to
> the net and your local network (if they are dynamic, this can also
> sometimes be tricked). Of course, combined router/modems have this
> separation practically "by definition".

I can only recall one router where this wasn't the case, my first weird
and wonderful DSL line in the Philippines :D Normally, why bother
routing if you can just physically connect the thwo networks and have
their traffic intermix?

> However, in any case it requires that the functionality you mention is
> implemented on the router and has no bugs and that the router cannot
> be compromised by other means.

Sure, if your router is compromised you're fuxx0red anyway. I was just
saying that in any halfway sane router these NAT problems are not an
issue. And with many routers running Linux today so you can even get a
shell and check iptables... :)

cheers,
	Matthias
-- 
I prefer encrypted and signed messages. KeyID: FAC37665
Fingerprint: 8C16 3F0A A6FC DF0D 19B0  8DEF 48D9 1700 FAC3 7665

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^ permalink raw reply	[flat|nested] 35+ messages in thread

* Re: [gentoo-user] Is there a way to automate rsync of updated portage  tree across multiple boxes without each having to pull it down from a gentoo  mirror
  2008-09-16 18:36                     ` Vaeth
@ 2008-09-16 22:51                       ` Matthias Bethke
  0 siblings, 0 replies; 35+ messages in thread
From: Matthias Bethke @ 2008-09-16 22:51 UTC (permalink / raw
  To: gentoo-user

[-- Attachment #1: Type: text/plain, Size: 1879 bytes --]

Hi Vaeth,
on Tue, Sep 16, 2008 at 08:36:28PM +0200, you wrote:
> > > Also a chroot jail is not a security feature: There are several
> > > ways known how to break out.
> > 
> > [...] But there's only one reason I can see why you'd use a
> > chroot environment *except* for security and that's to have more than
> > one set of system binaries active at the same time for different
> > applications.
> 
> Or simply several systems (e.g. amd64 and x86, or gentoo and debian,
> or your boot disk and your newly installed system [the install handbook
> makes massive use of chroot]). This is exactly what chroot was made for.

Sure, that's why I kept it as general als "more than one set", be it a
different architecture/vendor/purpose/whatever.

> > I'd say the vast majority of chroot jails are there for nothing
> > else but security.
> 
> Alan Cox: "chroot is not and never has been a security tool", see e.g.
> http://kerneltrap.org/Linux/Abusing_chroot

No disrespect to Mr. Cox but a silly argument stays a silly argument
even if brought forward by Alan. Programs like postfix certainly don't
use chroots for security because they were designed noobs or incompetent
people. Alan acknowledges that "Normal users cannot use chroot()
themselves so they can't use chroot to get back out" but insists on his
point, completely ignoring that doing a chroot() immediately followed by
dropping your root privileges is exactly the recommended way to use it
for security. That's not to say that setting up a vserver for each of
your programs exposed to the net wasn't *more* secure than a chroot if
you want to do it but it's certainly a whole lot more secure if used
properly than not doing it at all.

cheers,
	Matthias

-- 
I prefer encrypted and signed messages. KeyID: FAC37665
Fingerprint: 8C16 3F0A A6FC DF0D 19B0  8DEF 48D9 1700 FAC3 7665

[-- Attachment #2: Type: application/pgp-signature, Size: 197 bytes --]

^ permalink raw reply	[flat|nested] 35+ messages in thread

* Re: [gentoo-user] Is there a way to automate rsync of updated  portage  tree across multiple boxes without each having to pull it  down from a gentoo  mirror
       [not found]                     ` <bcOfH-5JD-1@gated-at.bofh.it>
@ 2008-09-17  7:49                       ` Vaeth
  2008-09-18 10:34                         ` Matthias Bethke
  0 siblings, 1 reply; 35+ messages in thread
From: Vaeth @ 2008-09-17  7:49 UTC (permalink / raw
  To: gentoo-user


On Tue, 16 Sep 2008, Matthias Bethke wrote:

> [...] that in any halfway sane router these NAT problems are not an
> issue. And with many routers running Linux today so you can even get a
> shell and check iptables... :)

We are obviously talking about a different price category of routers.
Most routers people use here in Germany for home systems are from their
ISP, and they are usually proprietary implementations where you cannot do
much more than to configure them by web interface with the enclosed
windows software (if you can decide which ports go through you already
have an "advanced" router). Unless by experimenting it is close to
impossible to decide what the router really does or does not.
I wouldn't trust them as far as I can throw a stone.



^ permalink raw reply	[flat|nested] 35+ messages in thread

* Re: [gentoo-user] Is there a way to automate rsync of updated  portage  tree across multiple boxes without each having to pull it  down from a gentoo  mirror
       [not found]                   ` <bcRGL-1yI-21@gated-at.bofh.it>
@ 2008-09-17  8:40                     ` Vaeth
  2008-09-17  9:22                       ` Nicolas Sebrecht
  2008-09-18 11:20                       ` Matthias Bethke
  0 siblings, 2 replies; 35+ messages in thread
From: Vaeth @ 2008-09-17  8:40 UTC (permalink / raw
  To: gentoo-user


Matthias Bethke wrote:

> > > I'd say the vast majority of chroot jails are there for nothing
> > > else but security.
> > 
> > Alan Cox: "chroot is not and never has been a security tool", see e.g.
> > http://kerneltrap.org/Linux/Abusing_chroot
> 
> No disrespect to Mr. Cox but a silly argument stays a silly argument
> even if brought forward by Alan. Programs like postfix certainly don't
> use chroots for security because they were designed noobs or incompetent
> people.

I did not cite the webpage because of the insults but because it shows
how much the kernel programmers are interested in closing possible ways
to break out of a chroot: not at all, because they think it is ok.
That's why I said that _only_ with grsecurity a chroot _might perhaps_
be considered as a serious security measurement (but in fact, people
which really need chroot to run binaries from two systems cannot activate
these security enhancements).

> Alan acknowledges that "Normal users cannot use chroot()
> themselves so they can't use chroot to get back out"

Yes, _this_ method of breaking out does not work without additional
exploits like privilege escalation. (grsecurity closes a lot more methods;
I did never reasearch which tricks might perhaps work as a user).
But if everything works as it should, just running with low privileges
does not make much of a difference than running with low privileges in
a chroot: In any case you should only have access to those data which
the privileges allow. (Admittedly there is a _slight_ increase in
security: You might now be safe of ways of privilege escalation by bugs
in certain SUID-programms).

> That's not to say that setting up a vserver for each of
> your programs exposed to the net wasn't *more* secure than a chroot

That's a different topic, but a vserver might also even be more
dangerous than doing nothing, because it has to be implemented (of course)
with the highest available privileges, and so you have an additional
risk of bugs (i.e. possible exploits) of the vserver - and in such a
case the attacker has immediately the highest privileges.

> but it's certainly a whole lot more secure if used
> properly than not doing it at all.

...as is the usage of NAT as a "security feature".
Of course, saying that using NAT or using chroot would not increase
security at all would be a lie.  But it is better to emphasize the
dangers than to support the common misbelieve (as Alan alrady pointed
out) that by using it there is no risk that "closed" ports can come
through or that no other data than those in the chroot can be accessed.
Remember the starting point of the discussion: The statement "rsyncd uses
chroot, so an attacker can do nothing bad" is just false.



^ permalink raw reply	[flat|nested] 35+ messages in thread

* Re: [gentoo-user] Is there a way to automate rsync of updated  portage  tree across multiple boxes without each having to pull it  down from a gentoo  mirror
  2008-09-17  8:40                     ` Vaeth
@ 2008-09-17  9:22                       ` Nicolas Sebrecht
  2008-09-18 11:20                       ` Matthias Bethke
  1 sibling, 0 replies; 35+ messages in thread
From: Nicolas Sebrecht @ 2008-09-17  9:22 UTC (permalink / raw
  To: gentoo-user



<snip>

Could you please use a mail client which insert correctly the fields
"In-Reply-To" ans "Reference" ?

-- 
Nicolas Sebrecht




^ permalink raw reply	[flat|nested] 35+ messages in thread

* Re: [gentoo-user] Is there a way to automate rsync of updated   portage  tree across multiple boxes without each having to pull it  down  from a gentoo  mirror
       [not found]                       ` <bd1wE-5T7-9@gated-at.bofh.it>
@ 2008-09-17 16:27                         ` Vaeth
  2008-09-17 16:46                           ` kashani
  0 siblings, 1 reply; 35+ messages in thread
From: Vaeth @ 2008-09-17 16:27 UTC (permalink / raw
  To: gentoo-user


> Could you please use a mail client which insert correctly the fields
> "In-Reply-To" ans "Reference" ?

Thanks for the hint, I was not aware of this. But unfortunately, it
appears that it is not just a question of the mail client:
I am subsribed to the list as post-only (for several reasons which I do
not want to discuss now) and I am actually reading/replying the
usenet copy linux.gentoo.user of this list.
If you know how I could find out (and use with pine) the correct data
in this way, I would be glad to do so, but I am afraid it is impossible.

However, due to lack of time this will probably anyway be the last
falsely referencing posting for quite a while: my frequent postings in
the previous days were really a big exception.



^ permalink raw reply	[flat|nested] 35+ messages in thread

* Re: [gentoo-user] Is there a way to automate rsync of updated   portage tree across multiple boxes without each having to pull it  down  from a gentoo  mirror
  2008-09-17 16:27                         ` Vaeth
@ 2008-09-17 16:46                           ` kashani
  2008-09-17 18:59                             ` Volker Armin Hemmann
  0 siblings, 1 reply; 35+ messages in thread
From: kashani @ 2008-09-17 16:46 UTC (permalink / raw
  To: gentoo-user

Vaeth wrote:
>> Could you please use a mail client which insert correctly the fields
>> "In-Reply-To" ans "Reference" ?
> 
> Thanks for the hint, I was not aware of this. But unfortunately, it
> appears that it is not just a question of the mail client:
> I am subsribed to the list as post-only (for several reasons which I do
> not want to discuss now) and I am actually reading/replying the
> usenet copy linux.gentoo.user of this list.
> If you know how I could find out (and use with pine) the correct data
> in this way, I would be glad to do so, but I am afraid it is impossible.
> 
> However, due to lack of time this will probably anyway be the last
> falsely referencing posting for quite a while: my frequent postings in
> the previous days were really a big exception.
> 

Trying to follow the thirty odd threads your client is creating when 
their should be only one is really really annoying.

And you're completely wring about NAT routers, but damned if I can find 
the actual parts of the thread I want to respond to.

kashani



^ permalink raw reply	[flat|nested] 35+ messages in thread

* Re: [gentoo-user] Is there a way to automate rsync of updated   portage tree across multiple boxes without each having to pull it  down  from a gentoo  mirror
  2008-09-17 16:46                           ` kashani
@ 2008-09-17 18:59                             ` Volker Armin Hemmann
  2008-09-19 13:58                               ` Alex Schuster
  0 siblings, 1 reply; 35+ messages in thread
From: Volker Armin Hemmann @ 2008-09-17 18:59 UTC (permalink / raw
  To: gentoo-user

On Wednesday 17 September 2008, kashani wrote:
> Vaeth wrote:
> >> Could you please use a mail client which insert correctly the fields
> >> "In-Reply-To" ans "Reference" ?
> >
> > Thanks for the hint, I was not aware of this. But unfortunately, it
> > appears that it is not just a question of the mail client:
> > I am subsribed to the list as post-only (for several reasons which I do
> > not want to discuss now) and I am actually reading/replying the
> > usenet copy linux.gentoo.user of this list.
> > If you know how I could find out (and use with pine) the correct data
> > in this way, I would be glad to do so, but I am afraid it is impossible.
> >
> > However, due to lack of time this will probably anyway be the last
> > falsely referencing posting for quite a while: my frequent postings in
> > the previous days were really a big exception.
>
> Trying to follow the thirty odd threads your client is creating when
> their should be only one is really really annoying.
>
> And you're completely wring about NAT routers, but damned if I can find
> the actual parts of the thread I want to respond to.
>
> kashani

there is no problem with his posts in kmail.




^ permalink raw reply	[flat|nested] 35+ messages in thread

* Re: [gentoo-user] Is there a way to automate rsync of updated portage  tree across multiple boxes without each having to pull it down from a gentoo  mirror
  2008-09-17  7:49                       ` Vaeth
@ 2008-09-18 10:34                         ` Matthias Bethke
  2008-09-18 10:47                           ` Heiko Wundram
  0 siblings, 1 reply; 35+ messages in thread
From: Matthias Bethke @ 2008-09-18 10:34 UTC (permalink / raw
  To: gentoo-user

[-- Attachment #1: Type: text/plain, Size: 924 bytes --]

Hi Vaeth,
on Wed, Sep 17, 2008 at 09:49:08AM +0200, you wrote:
> > [...] that in any halfway sane router these NAT problems are not an
> > issue. And with many routers running Linux today so you can even get a
> > shell and check iptables... :)
> 
> We are obviously talking about a different price category of routers.
> Most routers people use here in Germany for home systems are from their
> ISP, and they are usually proprietary implementations [...]

Huh? I don't have a good overview of the market here but the ISP I work
at uses only FritzBox routers which run a fine Linux, and as far as I
know so do most of T-Com's Speedport models which should be the most
widely used in Germany. Not that it was significantly cheaper than a
FritzBox or a WRT54...

cheers,
	Matthias
-- 
I prefer encrypted and signed messages. KeyID: FAC37665
Fingerprint: 8C16 3F0A A6FC DF0D 19B0  8DEF 48D9 1700 FAC3 7665

[-- Attachment #2: Type: application/pgp-signature, Size: 197 bytes --]

^ permalink raw reply	[flat|nested] 35+ messages in thread

* Re: [gentoo-user] Is there a way to automate rsync of updated portage  tree across multiple boxes without each having to pull it down from a gentoo  mirror
  2008-09-18 10:34                         ` Matthias Bethke
@ 2008-09-18 10:47                           ` Heiko Wundram
  0 siblings, 0 replies; 35+ messages in thread
From: Heiko Wundram @ 2008-09-18 10:47 UTC (permalink / raw
  To: gentoo-user

Am Thursday 18 September 2008 12:34:17 schrieb Matthias Bethke:
> Hi Vaeth,
>
> on Wed, Sep 17, 2008 at 09:49:08AM +0200, you wrote:
> > > [...] that in any halfway sane router these NAT problems are not an
> > > issue. And with many routers running Linux today so you can even get a
> > > shell and check iptables... :)
> >
> > We are obviously talking about a different price category of routers.
> > Most routers people use here in Germany for home systems are from their
> > ISP, and they are usually proprietary implementations [...]
>
> Huh? I don't have a good overview of the market here but the ISP I work
> at uses only FritzBox routers which run a fine Linux, and as far as I
> know so do most of T-Com's Speedport models...

Most of the T-Com Speedports (except for the very old ones, which come from 
Siemens) are just rebranded FritzBoxen (with some functionality 
removed/patched), so they also run a(n ARM-)Linux, and are even more or less 
firm-ware compatible with the FritzBox firmwares (I reflashed a Speedport 500 
[?? IIRC] once with a FritzBox firmware to get proper VoIP support).

Just FYI.

-- 
Heiko Wundram



^ permalink raw reply	[flat|nested] 35+ messages in thread

* Re: [gentoo-user] Is there a way to automate rsync of updated portage  tree across multiple boxes without each having to pull it down from a gentoo  mirror
  2008-09-17  8:40                     ` Vaeth
  2008-09-17  9:22                       ` Nicolas Sebrecht
@ 2008-09-18 11:20                       ` Matthias Bethke
  1 sibling, 0 replies; 35+ messages in thread
From: Matthias Bethke @ 2008-09-18 11:20 UTC (permalink / raw
  To: gentoo-user

[-- Attachment #1: Type: text/plain, Size: 5045 bytes --]

Hi Vaeth,
on Wed, Sep 17, 2008 at 10:40:47AM +0200, you wrote:
> > > Alan Cox: "chroot is not and never has been a security tool", see e.g.
> > > http://kerneltrap.org/Linux/Abusing_chroot
> > 
> > No disrespect to Mr. Cox but a silly argument stays a silly argument
> > even if brought forward by Alan. Programs like postfix certainly don't
> > use chroots for security because they were designed noobs or incompetent
> > people.
> 
> I did not cite the webpage because of the insults but because it shows
> how much the kernel programmers are interested in closing possible ways
> to break out of a chroot
as root
> : not at all, because they think it is ok.
> That's why I said that _only_ with grsecurity a chroot _might perhaps_
> be considered as a serious security measurement (but in fact, people
> which really need chroot to run binaries from two systems cannot activate
> these security enhancements).

Sure, you can't expect that the Debian-loving friend you gave root on
your Debian-chrooted-on-Gentoo system will stay confined to that chroot.
Big deal, just don't do it. That's not what any sane person would
recommend chroot for anyway.

> > Alan acknowledges that "Normal users cannot use chroot()
> > themselves so they can't use chroot to get back out"
> 
> Yes, _this_ method of breaking out does not work without additional
> exploits like privilege escalation. (grsecurity closes a lot more methods;
> I did never reasearch which tricks might perhaps work as a user).
> But if everything works as it should, just running with low privileges
> does not make much of a difference than running with low privileges in
> a chroot: In any case you should only have access to those data which
> the privileges allow.

...which is usually pretty much everything in the bin directories, a lot
of stuff in /etc, and most importantly a shell. In a non-chrooted
program, an attacker who can exploit a bug can simply bind /bin/sh to a
port, run netcat, even use your compiler to prepare the next steps for
perhaps a local privilege escalation. In a chroot, nothing of the sort
is possible, you're limited to what you can do in your injected code.

> (Admittedly there is a _slight_ increase in security: You might now be
> safe of ways of privilege escalation by bugs in certain
> SUID-programms).

...plus safe from most information disclosure that would otherwise be
possible.

> > That's not to say that setting up a vserver for each of
> > your programs exposed to the net wasn't *more* secure than a chroot
> 
> That's a different topic, but a vserver might also even be more
> dangerous than doing nothing, because it has to be implemented (of course)
> with the highest available privileges, and so you have an additional
> risk of bugs (i.e. possible exploits) of the vserver - and in such a
> case the attacker has immediately the highest privileges.

That's true, I just mentioned it because that's what Alan mentioned as
the true security tool.

> > but it's certainly a whole lot more secure if used
> > properly than not doing it at all.
> 
> ...as is the usage of NAT as a "security feature".
> Of course, saying that using NAT or using chroot would not increase
> security at all would be a lie.  But it is better to emphasize the
> dangers than to support the common misbelieve (as Alan alrady pointed
> out) that by using it there is no risk that "closed" ports can come
> through or that no other data than those in the chroot can be accessed.

Alan would probably emphasize the dangers of a seat belt and say
competent people used it only to keep their shopping bags from falling
over and not as a security tool because if you don't use it the
recommended way you can strangle yourself with it =^>

> Remember the starting point of the discussion: The statement "rsyncd uses
> chroot, so an attacker can do nothing bad" is just false.

Except that statement wasn't Neil's. To quote it correctly:
| In addition, the default rsyncd configuration with Gentoo uses a chroot
| jail. So even if you do allow connections to your portage tree, they
| won't be able to access anything else.

To summarize: for an attacker to be able to compromise a chrooted
rsyncd behind a NATting DSL router:
a) your ISP has to have a router configuration b0rked beyond belief
b) the attacker has to be aware of that and be able to distinguish
between your traffic and that of several hundred others that will
respond to his packets to 192.168.x.x
c) your router has to have a serious security hole
d) rsyncd has to be exploitable
e) your kernel needs to have a local privilege escalation bug

Now if that risk is worth the more complicated configuration using rsync
over ssh, I'm really not sure...I think I'd rather spend the time on
folding tin foil hats for the upcoming attack from Mars ;)

cheers,
	Matthias
-- 
I prefer encrypted and signed messages. KeyID: FAC37665
Fingerprint: 8C16 3F0A A6FC DF0D 19B0  8DEF 48D9 1700 FAC3 7665

[-- Attachment #2: Type: application/pgp-signature, Size: 197 bytes --]

^ permalink raw reply	[flat|nested] 35+ messages in thread

* Re: [gentoo-user] Is there a way to automate rsync of updated   portage tree across multiple boxes without each having to pull it  down  from a gentoo  mirror
  2008-09-17 18:59                             ` Volker Armin Hemmann
@ 2008-09-19 13:58                               ` Alex Schuster
  0 siblings, 0 replies; 35+ messages in thread
From: Alex Schuster @ 2008-09-19 13:58 UTC (permalink / raw
  To: gentoo-user

Volker Armin Hemmann writes:
> On Wednesday 17 September 2008, kashani wrote:
> > Vaeth wrote:
> > >> Could you please use a mail client which insert correctly the
> > >> fields "In-Reply-To" ans "Reference" ?
> > >
> > > Thanks for the hint, I was not aware of this. But unfortunately, it
> > > appears that it is not just a question of the mail client:
> > > I am subsribed to the list as post-only (for several reasons which
> > > I do not want to discuss now) and I am actually reading/replying
> > > the usenet copy linux.gentoo.user of this list.
> > > If you know how I could find out (and use with pine) the correct
> > > data in this way, I would be glad to do so, but I am afraid it is
> > > impossible.
[...]
> > Trying to follow the thirty odd threads your client is creating when
> > their should be only one is really really annoying.
> >
> > And you're completely wring about NAT routers, but damned if I can
> > find the actual parts of the thread I want to respond to.
> >
> > kashani
>
> there is no problem with his posts in kmail.

Hmm, I have about seven Threads started by him with "Re: [gentoo-user] Is 
there a way...". The other of his respsonses, which do not start a new 
thread, have this own posts as reference, not the one he is actually 
replying to. All references look like <bcMnF-3fg-13@gated-at.bofh.it>, 
seems like the mail-to-usenet gateway changes them.
Couldn't he just reply with his usenet client, and the gateway would 
convert things back so it shows up correctly on the list?

I agree it's a little annoying, but as long as it's just him and only 
occasionally, I don't mind.

	Wonko



^ permalink raw reply	[flat|nested] 35+ messages in thread

end of thread, other threads:[~2008-09-19 13:58 UTC | newest]

Thread overview: 35+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
     [not found] <bcHnZ-4ZN-3@gated-at.bofh.it>
     [not found] ` <bcHo0-4ZN-5@gated-at.bofh.it>
     [not found]   ` <bcHo0-4ZN-7@gated-at.bofh.it>
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2008-09-16 15:29               ` [gentoo-user] Is there a way to automate rsync of updated portage tree across multiple boxes without each having to pull it down from a gentoo mirror Vaeth
2008-09-16 15:59                 ` Neil Bothwick
2008-09-16 17:18                   ` Matthias Bethke
     [not found] <bd0TI-4Z4-3@gated-at.bofh.it>
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     [not found]                       ` <bd1wE-5T7-9@gated-at.bofh.it>
2008-09-17 16:27                         ` Vaeth
2008-09-17 16:46                           ` kashani
2008-09-17 18:59                             ` Volker Armin Hemmann
2008-09-19 13:58                               ` Alex Schuster
     [not found] <bcND3-4OQ-13@gated-at.bofh.it>
     [not found] ` <bcND3-4OQ-15@gated-at.bofh.it>
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     [not found]     ` <bcND3-4OQ-19@gated-at.bofh.it>
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     [not found]           ` <bcND3-4OQ-25@gated-at.bofh.it>
     [not found]             ` <bcND3-4OQ-27@gated-at.bofh.it>
     [not found]               ` <bcND3-4OQ-29@gated-at.bofh.it>
     [not found]                 ` <bcND3-4OQ-7@gated-at.bofh.it>
     [not found]                   ` <bcRGL-1yI-21@gated-at.bofh.it>
2008-09-17  8:40                     ` Vaeth
2008-09-17  9:22                       ` Nicolas Sebrecht
2008-09-18 11:20                       ` Matthias Bethke
     [not found] <bcMnF-3fg-7@gated-at.bofh.it>
     [not found] ` <bcMnF-3fg-9@gated-at.bofh.it>
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     [not found]                 ` <bcMnF-3fg-3@gated-at.bofh.it>
     [not found]                   ` <bcMH5-3z1-37@gated-at.bofh.it>
2008-09-16 18:36                     ` Vaeth
2008-09-16 22:51                       ` Matthias Bethke
     [not found]                 ` <bcN0q-3SD-21@gated-at.bofh.it>
     [not found]                   ` <bcN0q-3SD-19@gated-at.bofh.it>
     [not found]                     ` <bcOfH-5JD-1@gated-at.bofh.it>
2008-09-17  7:49                       ` Vaeth
2008-09-18 10:34                         ` Matthias Bethke
2008-09-18 10:47                           ` Heiko Wundram
     [not found] <bcKOR-17K-11@gated-at.bofh.it>
     [not found] ` <bcKOR-17K-13@gated-at.bofh.it>
     [not found]   ` <bcKOR-17K-15@gated-at.bofh.it>
     [not found]     ` <bcKOR-17K-17@gated-at.bofh.it>
     [not found]       ` <bcKOR-17K-19@gated-at.bofh.it>
     [not found]         ` <bcKOR-17K-21@gated-at.bofh.it>
     [not found]           ` <bcKOR-17K-23@gated-at.bofh.it>
     [not found]             ` <bcKOR-17K-25@gated-at.bofh.it>
     [not found]               ` <bcKOQ-17K-9@gated-at.bofh.it>
     [not found]                 ` <bcLhW-1SC-25@gated-at.bofh.it>
2008-09-16 17:14                   ` Vaeth
2008-09-16 17:29                     ` Matthias Bethke
2008-09-16 19:07                       ` Alan McKinnon
     [not found]                   ` <bcMnJ-3fg-29@gated-at.bofh.it>
2008-09-16 17:54                     ` Vaeth
2008-09-16 19:17                       ` Matthias Bethke
     [not found] <bcoOp-5Xd-21@gated-at.bofh.it>
     [not found] ` <bcDkg-8hz-3@gated-at.bofh.it>
     [not found]   ` <bcDkg-8hz-5@gated-at.bofh.it>
     [not found]     ` <bcDkg-8hz-7@gated-at.bofh.it>
     [not found]       ` <bcDkg-8hz-1@gated-at.bofh.it>
     [not found]         ` <bcFPc-3e4-7@gated-at.bofh.it>
2008-09-16 11:49           ` Vaeth
2008-09-16 13:24             ` Neil Bothwick
     [not found] <bcn6b-3DN-35@gated-at.bofh.it>
     [not found] ` <bcn6b-3DN-33@gated-at.bofh.it>
     [not found]   ` <bcnpk-3XO-13@gated-at.bofh.it>
2008-09-15 16:01     ` Vaeth
     [not found] ` <bcnyW-48m-3@gated-at.bofh.it>
     [not found]   ` <bctXI-4kr-15@gated-at.bofh.it>
     [not found]     ` <bcCxX-7bd-9@gated-at.bofh.it>
2008-09-16  7:29       ` Vaeth
2008-09-16 10:16         ` Neil Bothwick
2008-09-16 10:49           ` Etaoin Shrdlu
2008-09-16 11:49             ` Iain Buchanan
2008-09-16 13:21               ` Neil Bothwick
2008-09-15 14:09 Michael Sullivan
2008-09-15 14:17 ` Alan McKinnon
2008-09-15 14:31   ` Michael Sullivan
2008-09-15 14:41     ` Alan McKinnon
2008-09-15 21:34       ` Neil Bothwick
2008-09-16  6:42         ` Alan McKinnon
2008-09-15 14:54 ` Aniruddha

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