I have a application inside which i have kept other applications.I want to launch other application in root privilege through main application.As we know AuthorizationExecuteWithPrivileges() has been deprecated, so that i have created a privileged helper tool. I am using Main application to install this helper tool through SMJobBless() function , and communicate through XPC mechanism. Every thing is working fine, Main application sending message(Path of application to be launch) to helper tool that is already running in root mode. The helper tool is able to launch that application provided in path, but the problem is, launched application doesn't have root privilege. Can anyone tell me how i can use this helper tool to launch another application in root privilege.Or is there any other mechanism to achieve it, i will ever thankful for this.
Well, the title says it all. From my Windows Store (a.k.a. "Metro") application, I need to know whether some other specific application is installed on that machine. Alternatively, I want to know whether there is some application that able to handle URL of specific theme (for me its the same problem) - without launching it.
I tried to use PackageManager from Windows.Management.Deployment namespace, but it not accessible from winrt...
http://msdn.microsoft.com/en-us/library/windows/apps/windows.management.deployment.aspx
Is there any other way to do that?
Thanks!
No, there isn't any way to do it. If you want to invoke another app though - you can use a custom protocol with protocol activation to invoke an app that supports that protocol or have it installed from the store.
I would like to make my AIR desktop browser be the default web browser on a system, how can I go about and do this ?
I would also like to know how I can retrieve the link that has been clicked (in an email for example) to interact with the application.
thanks !
As far as I'm aware this is impossible in AIR. You can associate your app with file types using the air-app.xml descriptor or by calling NativeApplication.setAsDefaultApplication() (Read about it here). Opening files after using either of these methods will trigger your application to launch with an InvokeEvent (Read Here). You can read a good tutorial for this here.
However, if I understand correctly, you also want your app to take over any HTTP requests from inside any other app. To do this you have to override the protocol default application, which requires a registry edit and (I believe) that AIR can't do that. You may be able to write an external script in C or Java to do that for you (This might help with that).
Even though the API has been open since Mac OS X Leopard, there's surprisingly, and unfortunately, very little documentation on how to correctly use SMJobBless() for creating privileged helper tools. There are a lot of gotchas, even when copying code directly from Apple's sample project. Luckily, I've found my way around this, and have gotten the basis for my helper tool working.
However, it would seem that SMJobBless() only blesses the tool and copies it over, but doesn't run it. I've included code in my helper tool's main() function that should run, but doesn't (since NSLog() inexplicably doesn't work–according to the tiny bit of information I have found–I've tried syslog()ing some "Hello world" type strings, but nothing appears on the system console). There's no indication that the helper tool is launched at all.
The documentation is mostly useless. It simply says that after SMJobBless() is called, the helper tool is 'ready', with no indication of what 'ready' even means.
Furthermore, Apple's sample doesn't include any interprocess communication code, and doesn't explain how one is supposed to interact with the helper tool. Do you use Distributed Objects? Mach ports? Who knows? There's no official word on how to do it.
So, does anyone have any information on how to get this done? I've confirmed that the helper tool is installed, and authentication works, but I simply can't figure out how to launch the helper tool and communicate with it - there's simply such a gap in the documentation that this is a mystery for now. It's very frustrating; I can't be the only one with this problem (but there's little mention of it anywhere), and SMJobBless() obviously works somehow, since it's what Apple uses.
(Please don't mention AuthorizationExecuteWithPrivileges(). I'm not using it: it's deprecated, sure to go away, and is a major security hole. No thanks.)
XPC isn't an option if you're trying to elevate privileges (from https://developer.apple.com/library/archive/documentation/MacOSX/Conceptual/BPSystemStartup/Chapters/CreatingXPCServices.html):
By default, XPC services are run in the most restricted environment
possible—sandboxed with minimal filesystem access, network access, and
so on. Elevating a service’s privileges to root is not supported.
SMJobBless will install a helper tool and register it with Launchd, as in the SMJobBless example provided by Apple. The trick to getting your helper tool to actually launch is to simply attempt to connect to your helper tool's advertised services.
There was a WWDC2010 example called ssd that demonstrated a simple launchd client/server model via sockets. It's not available from Apple any longer, but I've found a link here: https://lists.apple.com/archives/macnetworkprog/2011/Jul/msg00005.html
I've incorporated the dispatch queue handling in the server code from the ssd example into the helper tool in the SMJobBless example and can confirm that my helper tool is indeed running (as root) when my main app attempts a connection on the appropriate port. See the WWDC2010 video on Launchd to understand the other mechanisms with which you can communicate with your helper tool (other than sockets).
I'm not sure I can legally redistribute the modified sources I have, but it should be fairly straightforward to merge the two projects and get your helper tool running.
Edit: Here is an example project I wrote that uses a distributed object for communication between the app and helper: https://www.dropbox.com/s/5kjl8koyqzvszrl/Elevator.zip
In fact #KurtRevis's comment is right, you can use XPC APIs without using XPC services, and it is ideally suited to the job since.
Nathan de Vries has an excellent writeup of using XPC APIs with SMJobBless and has even modified the SMJobBless sample app to use mach XPC to both activate the job and for bidirectional communications:
http://atnan.com/blog/2012/02/29/modern-privileged-helper-tools-using-smjobbless-plus-xpc/
https://github.com/atnan/SMJobBlessXPC
Somewhat related to all this is avoiding unnecessary admin password prompts. See the following email list thread for ideas on how to check if the bundle version and code signature of an already installed helper match (which also allows you to remove a higher versioned helper in the case of a user downgrading):
http://www.cocoabuilder.com/archive/cocoa/309298-question-about-smjobbless.html
If you don't want to wade through the thread, here is a link to the modified SMJobBless sample project provided by Eric Gorr:
http://ericgorr.net/cocoadev/SMJobBless.zip
Also note that the ssd example mentioned in other answers here is still available online from Apple as part of the WWDC 2010 download bundle:
http://connect.apple.com/cgi-bin/WebObjects/MemberSite.woa/wa/getSoftware?code=y&source=x&bundleID=20645
Apple now (2015) has an "EvenBetterAuthorizationSample" that demonstrates installing a privileged helper tool and using the NSXPCConnection API to communicate between the app and the helper tool:
https://developer.apple.com/library/mac/samplecode/EvenBetterAuthorizationSample/Listings/Read_Me_About_EvenBetterAuthorizationSample_txt.html
The README is some of the best (only?) documentation of SMJobBless() available.
I feel your pain and am in the same boat. I'm in charge of the Mac version of an app that needs to perform various system configuration tasks. Of course some of these task need to be done with administrative rights. I started by using the sample code from BetterAuthorizationSample. It was a major pain to implement but it seemed to work. But then ran into cases where it would crash on some systems. I didn't understand everything that the BAS code did and my own lack of coding experience probably contributed to the problems. So I had to remove these privileged functions from my app.
Apple doesn't seem to care about the lack of documentation. See this message from the creator of the ServiceManagement framework. From his comments, I assume that XPC is the "intuitive replacement" he is referring to, but since it is only available on Lion, you'll still have to find another solution for Snow Leopard or earlier clients. It's also not clear to me if XPC can be used for privileged helpers (system level tasks that require admin or root access) or is just intended for privilege separation within your own app to make it more secure.
The BAS documentation is in desperate need of an update, but it also doesn't appear to be a top priority.
Now I'm attempting to rewrite my app from the ground up. Professional Cocoa Application Security by Graham Lee gives some insight on how to do use privileged helpers with SMJobBless, but doesn't go into much detail about on-demand access to launchd jobs.
So here's what I've been able to find:
If you want to launch your privileged helper on demand, you'll have to use an IPC socket. You should add a Sockets entry to your helper's launchd.plist. After you install the app with SMJobBless, the helper will need to "check-in" with launchd (via LAUNCH_KEY_CHECKIN) to get the socket file descriptors.
Sadly, the only mentions of LAUNCH_KEY_CHECKIN seem to be in the SampleD and BAS sample code.
I don't have any experience with sockets, so that's my roadblock at the moment. I'd like to use the highest level API I can, so I'm trying to find out if I can use any Objective-C classes for this (like NSStream).
You might find the launchd developers mailing list helpful. Another XPC option I just found out about is XPCKit. It's worth a look.
HTH
I wrote a blog post on this a few months ago, which included a cleaned up version of Apple's SMJobBless sample. Might help...
http://www.bornsleepy.com/bornsleepy/os-x-helper-applications
Itai have you looked at the SMJobBless sample code from WWDC 2010? It includes a helper tool and app to bless it.
https://developer.apple.com/library/mac/#samplecode/SMJobBless/Listings/ReadMe_txt.html#//apple_ref/doc/uid/DTS40010071-ReadMe_txt-DontLinkElementID_3
Its README file says:
This sample as it stands does not actually run the helper tool. The following samples show how to [sic] a launchd job and set up interprocess communication:
ssd (Doesn't seem to be online anymore. Was part of the WWDC 2010 sample code.)
BetterAuthorizationSample
I have a dynamic library, I intent to inject in running application & newly launched applications.
I can inject it in running applications with the help of a process running with root user permissions.
Now I am trying that library should get loaded as soon as application is launched. I know one such library capable of doing this called, application enhancer. I am looking for similar behavior.
Does anyone has an Idea how can this be achieved?
Look at SIMBL agent code. It adds a observer to application launch notification and then injects. You can follow the same approach.