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 appropriate 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              The key specified had been revoked.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), keyrings(7), keyutils(7)