keyctl_get_security(3) — Linux manual page


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

NAME         top

       keyctl_get_security - retrieve a key's security context

SYNOPSIS         top

       #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         top

       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


       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         top

       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         top

       ENOKEY The key specified is invalid.

              The key specified has expired.

              The key specified had been revoked.

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

LINKING         top

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

SEE ALSO         top

       keyctl(1), add_key(2), keyctl(2), request_key(2), keyctl(3),
       keyrings(7), keyutils(7)

COLOPHON         top

       This page is part of the keyutils (key management utilities) project.
       Information about the project can be found at [unknown -- if you
       know, please contact] If you have a bug report for
       this manual page, send it to  This page was
       obtained from the project's upstream Git repository
       on 2020-08-13.  (At that time, the date of the most recent commit
       that was found in the repository was 2020-07-07.)  If you discover
       any rendering problems in this HTML version of the page, or you
       believe there is a better or more up-to-date source for the page, or
       you have corrections or improvements to the information in this
       COLOPHON (which is not part of the original manual page), send a mail

Linux                            26 Feb 2010          KEYCTL_GET_SECURITY(3)

Pages that refer to this page: keyctl(2)keyctl(3)keyrings(7)