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              The key specified had been revoked.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