Re: Authenticate NSFileManager Operations
Re: Authenticate NSFileManager Operations
- Subject: Re: Authenticate NSFileManager Operations
- From: email@hidden
- Date: Wed, 5 May 2010 09:54:24 -0600
Thanks for the direction Ken!
-koko
On May 5, 2010, at 9:51 AM, Ken Thomases wrote:
On May 5, 2010, at 10:32 AM, email@hidden wrote:
I am using
- (BOOL)copyItemAtPath:(NSString *)srcPath toPath:(NSString
*)dstPatherror:(NSError **)error
to copy a framework to /Library/Frameworks.
But first I use
- (BOOL)removeItemAtPath:(NSString *)path error:(NSError **)error
On my system all is well.
It's not so much your system as the fact that you're logged into an
administrator account.
On a user system I get
You do not have appropriate access privileges.
On the remove step.
Indeed, a normal user account won't have permissions to modify stuff
in /Library
How does one invoke authentication for NSFileManager operations?
One does not. A central tenet of the Unix security model is that
processes can not gain privileges, they can only reduce their
privileges. So, privileged operations can only be performed by a
process which started out with privileges and never gave them up.
In other words, you have to launch a separate process in a special
way in order to perform privileged operations.
One technique is to use the "authopen" command, if it works for the
purpose. Another technique is outlined in the
BetterAuthorizationSample sample code:
http://developer.apple.com/mac/library/samplecode/BetterAuthorizationSample/Introduction/Intro.html
Cheers,
Ken
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