Hello Omaha example?

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Olaf van der Spek

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Sep 18, 2011, 4:18:01 PM9/18/11
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Is there a Hello Omaha World example available?
Is it possible to use the existing Google Omaha binaries/process/installation or does everyone need to install his own version of Omaha?
If the existing binaries can be used, is there any need to build Omaha from source?

Ryan Myers

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Sep 19, 2011, 6:54:34 PM9/19/11
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It depends on what you intend to do with it :)  The "stock" version of Omaha, as it exists on the SVN, will contact the Google servers for any installations/updates; it can only be used to install or update Google products.

In order to use Omaha to install/update other products, you need to create your own update server that understands the Omaha protocol, and then change the source for the client-side binary so that it contacts that server instead of the Google server.

~rjm

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Olaf van der Spek

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Sep 20, 2011, 6:31:24 PM9/20/11
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I'd like to use it for my own apps.
So that'd result in multiple updaters running on a user's machine. Why can't the existing binaries be used for other apps too? Would be a lot nicer.

Simon B.

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Sep 22, 2011, 6:11:02 AM9/22/11
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On Sep 20, 7:31 pm, Olaf van der Spek <olafvds...@gmail.com> wrote:
> Why can't the existing binaries be used for other apps too? Would be a lot nicer.

I've been thinking the same. One resident updater process to rule them
all. But perhaps it would be too complicated to have one updater that
handles several different "download/update sites" ?

Preferably the rule-them-all-omaha could take over from Microsoft
Update (which regularly reboots my computer and with that kills some
documents I had left open, or otherwise just slows things to a crawl
at the wrong time), as well as the Java and Adobe and Apple updaters
that are also just too annoying.

<wall of="text">
Optimally all apps, drivers, etc on windows, linux and mac should by
default go through some kind of application central that could be
trusted to warn users or even pop up uninstall-notifications if an
application is known to have gone bad. (And with download.com going
bad recently, one wonders if there even needs to be a meta-
notification via for instance social networks so the update provider
application would also force itself to show, with a slight delay
perhaps, what those you follow are saying about your update provider
and allow you to switch update provider. This could perhaps be
fostered through improvements to Omaha. What's in it for update
providers could be showing useful ads in a corner after each update
(something good that comes with something possibly annoying, but you'd
know why it's there) as well as handling transactions if you want to
buy a license for a pro or full software version.

<light in="the dark" size="tiny">On Windows CE / Mobile there's an app
OMarket that shows that it can be done for Windows. Cygwin setup.exe
provides quite a good database of (mostly terminal/text-mode)
software. Linux distributions have almost well-functioning update/
install mechanisms</light>

<endgame>You only wish they'd make the package management software
would pre-compute its stuff in the background to avoid having you wait
each time you start them, since the start delays make you shy away
from using them too much. But for the last couple of years this is
just wishful thinking. The most recent installer/updater GUI to be
revamped is perhaps Ubuntu Software Centre (USC) and I was tracking
the design process closely only to see that once again the simple and
understandable had to stand back for some confusing stuff. Perhaps
with USC aimed mostly towards complete newbies at least that would
leave space for Synaptic to become more usable. The most sorely needed
part for either of them is perhaps a faster backend for tracking
installed packages. But a first step would be to make the listing
asynchronous and just cache the "startup screen", installed apps
screen, and the most popular apps screen to leave the thousand-
packages-screens time to rebuilt itself from scratch, as it seems to
like to do this each time I start any linux package manager.</
endgame></wall>

Olaf van der Spek

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Oct 4, 2011, 12:48:47 PM10/4/11
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Somebody?

Ryan Myers

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Oct 4, 2011, 6:30:58 PM10/4/11
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We don't have a "Hello World" Omaha example, but we do have a guide being written up on how to customize Omaha for specific applications.  We'll get it on the wiki soon.

The main reason that Omaha does not currently update apps from multiple vendors is security.  Three examples immediately pop to mind:
* In order to add additional update servers for Omaha to check, you'd have to store the addresses of those servers somewhere.  (For example, the Registry).  This now becomes a point of attack - any application that can modify the Registry could redirect an app to get its updates from a malicious server.
* When checking for updates, Omaha signs the response using an RSA-based algorithm to able to ensure its authenticity and integrity.  This key has to be stored somewhere as well - which leads to the same problem as above.
* What prevents someone from registering hundreds or thousands of applications in order to DoS the service?

Omaha currently attempts to protect that information by hardcoding these, and other crucial bits of information, into the executable and protecting that using Authenticode.

~rjm

On Tue, Oct 4, 2011 at 4:48 AM, Olaf van der Spek <olafv...@gmail.com> wrote:
Somebody?

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Olaf van der Spek

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Oct 6, 2011, 1:51:14 PM10/6/11
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Op dinsdag 4 oktober 2011 19:30:58 UTC+2 schreef Ryan Myers het volgende:
* In order to add additional update servers for Omaha to check, you'd have to store the addresses of those servers somewhere.  (For example, the Registry).  This now becomes a point of attack - any application that can modify the Registry could redirect an app to get its updates from a malicious server.

1. If one can write to the (system-wide) registry, the machine has been compromised already.
 
* When checking for updates, Omaha signs the response using an RSA-based algorithm to able to ensure its authenticity and integrity.  This key has to be stored somewhere as well - which leads to the same problem as above.

2. Obscuring the key by putting it in the executable isn't security, is it?
 
* What prevents someone from registering hundreds or thousands of applications in order to DoS the service?


3. Don't you think there are easier ways to DoS the service?
 
Omaha currently attempts to protect that information by hardcoding these, and other crucial bits of information, into the executable and protecting that using Authenticode.


4.  If one has system wide / admin / root access, signing the binary doesn't offer any protection, does it?

IMO this limitation is a serious barrier for others to start using Omaha.

mic...@herrmann.io

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Aug 1, 2016, 9:35:48 PM8/1/16
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I just published a "Hello Omaha" tutorial. The official documentation is good, but leaves you to figure a lot of things out for yourself. I think Omaha is awesome and am hoping more people will use it if it's easier to approach. Have fun!
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