KEYCTL_RESTRICT_KEYRING(3)Linux Key Management CallsKEYCTL_RESTRICT_KEYRING(3)
NAME
keyctl_restrict_keyring - restrict keys that may be linked to a keyring
SYNOPSIS
#include <keyutils.h>
long keyctl_restrict_keyring(key_serial_t keyring,
const char *type, const char *restriction);
DESCRIPTION
keyctl_restrict_keyring() limits the linkage of keys to the given
keyring using a provided key type and restriction scheme. The available
options vary depending on the key type, and typically contain a re-
striction name possibly followed by key ids or other data relevant to
the restriction. If the type and restriction are both NULL, the keyring
will reject all links.
RETURN VALUE
On success keyctl_restrict_keyring() returns 0. On error, the value -1
will be returned and errno will have been set to an appropriate error.
ERRORS
EDEADLK
A restriction cycle was avoided. Two keyrings cannot restrict
each other.
EEXIST The keyring is already restricted.
EINVAL The restriction string is invalid or too large.
ENOKEY The key type in the restriction is invalid or not available.
ENOTDIR
The provided key id references an item that is not a keyring.
ENOENT The key type exists but does not support restrictions.
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), keyctl(2), keyctl(3), keyutils(7)
Linux 28 Feb 2017 KEYCTL_RESTRICT_KEYRING(3)
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