authopen man page on MacOSX

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AUTHOPEN(1)		  BSD General Commands Manual		   AUTHOPEN(1)

     authopen — open file with authorization

     authopen [-stdoutpipe] [-extauth] filename
     authopen [-stdoutpipe] [-extauth] -w [-a] filename
     authopen [-stdoutpipe] [-extauth] -c [-x -m mode -w] filename
     authopen [-stdoutpipe] [-extauth] -o flags filename
     authopen -h

     authopen provides authorization-based file opening services.  In its sim‐
     plest form, authopen verifies that it is allowed to open filename (using
     an appropriate sys.openfile.* authorization right) and then writes the
     file to stdout.  If -w is specified, authopen will read from stdin and
     write to the file.

     authopen is designed to be used both from the command line and program‐
     matically.	 The -stdoutpipe flag allows a parent process to receive an
     open file descriptor pointing to the file in question.

     Before opening filename, authopen will make an authorization request for
     a right of the form:

     ‘.readonly’ rights only allow for read-only file descriptors.
     ‘.readwrite’ rights allow for read/write file descriptors.
     ‘.readwritecreate’ rights allow for read/write descriptors and the cre‐
     ation of new files.

     The -extauth option can be used to provide an AuthorizationRef con‐
     structed by the client.  This generally prevents authopen from presenting
     an authorization dialog containing its own name.

      -stdoutpipe specifies that STDOUT_FILENO has been dup2()'d onto a pipe
	      to a parent process and that an open file descriptor to filename
	      (with the appropriate access mode) should be sent back across it
	      using the SCM_RIGHTS extension to sendmsg(2) rather than having
	      the file itself written to or read from stdin / stdout.

      -extauth specifies that authopen should read one AuthorizationExternal‐
	      Form structure from stdin, convert it to an AuthorizationRef,
	      and attempt to use it to authorize the open(2) operation.	 The
	      authorization should refer to the sys.apenfile right correspond‐
	      ing to the requested operation.  The authorization data will be
	      read before any additional data supplied on stdin, and will not
	      be included in data written with -w.

      -w      instructs authopen to open filename read/write and truncate it.
	      If -stdoutpipe has not been specified, authopen will then copy
	      stdin to filename until stdin is closed.

      -a      append to filename rather than truncating it (truncating is the

      -c      create the file if it doesn't exist.  -m requires -c.

      -m mode specify the mode bits if a file is created.

      -o flags numerically specify the flags that should be passed to open(2).

      -x      require that the file being created not exist.

     To replace /etc/hostconfig (assuming
     sys.openfile.readwrite./etc/hostconfig or better can be obtained):

	   $ cat tmpdata | authopen -w /etc/hostconfig

     authopen will fail if an appropriate sys.openfile.readonly.*,
     sys.openfile.readwrite.*, or sys.openfile.readwritecreate.* right cannot
     be obtained or if the named path does not exist.

     authopen should support prefix path authentication such that the right
     sys.openfile.*./dev/ could give access to all /dev entries and
     sys.openfile.*./dev/disk1 could give access to all disk1-related /dev

     authopen should use getopt(3).


     open(2), Security/Authorization.h, realpath(3), recvmsg(2).

     W. Richard Stevens, "Passing File Descriptors", Advanced Programming in
     the UNIX Environment.

     authopen appeared in Mac OS X 10.1 to assist with the manipulation of
     disk devices.

Darwin				  28 Feb 2013				Darwin

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