KEYCTL_GET_SECURITY(3)	  Linux Key Management Calls	KEYCTL_GET_SECURITY(3)



NAME
       keyctl_get_security - Retrieve a key's security context

SYNOPSIS
       #include <keyutils.h>

       long keyctl_get_security(key_serial_t key, char *buffer,
       size_t buflen);

       long keyctl_get_security_alloc(key_serial_t key, char **_buffer);

DESCRIPTION
       keyctl_get_security() retrieves the security context of a key as a NUL-
       terminated string.  This will be rendered in a form appropriate to  the
       LSM in force - for instance, with SELinux, it may look like

	      unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023

       The  caller  must  have	view permission on a key to be able to get its
       security context.

       buffer and buflen specify the buffer into  which	 the  string  will  be
       placed.	 If  the buffer is too small, the full size of the string will
       be returned, and no copy will take place.

       keyctl_get_security_alloc() is similar to keyctl_get_security()	except
       that it allocates a buffer big enough to hold the string and copies the
       string into it.	If successful, A pointer to the buffer	is  placed  in
       *_buffer.  The caller must free the buffer.

RETURN VALUE
       On success keyctl_get_security() returns the amount of data placed into
       the buffer.  If the buffer was too  small,  then	 the  size  of	buffer
       required	 will be returned, but no data will be transferred.  On error,
       the value -1 will be returned and errno will have been set to an appro-
       priate error.

       On  success  keyctl_get_security_alloc()	 returns the amount of data in
       the buffer, less the NUL terminator.  On error, the value  -1  will  be
       returned and errno will have been set to an appropriate error.

ERRORS
       ENOKEY The key specified is invalid.

       EKEYEXPIRED
	      The key specified has expired.

       EKEYREVOKED
	      The key specified had been revoked.

       EACCES The key exists, but is not viewable by the calling process.

LINKING
       This  is	 a  library  function  that can be found in libkeyutils.  When
       linking, -lkeyutils should be specified to the linker.

SEE ALSO
       keyctl(1),
       add_key(2),
       keyctl(2),
       request_key(2),
       keyctl(3),
       request-key(8)



Linux				  26 Feb 2010		KEYCTL_GET_SECURITY(3)