GENFS_CAN_ACCESS_ACL_POSIX1E(9) | Kernel Developer's Manual | GENFS_CAN_ACCESS_ACL_POSIX1E(9) |
genfs_can_access_acl_posix1e
—
#include <miscfs/genfs/genfs.h>
int
genfs_can_access_acl_posix1e
(struct
vnode *vp, kauth_cred_t cred,
uid_t file_uid, gid_t file_gid,
mode_t file_mode, struct acl
*acl, accmode_t accmode);
This call is intended to support implementations of
VOP_ACCESS(9), which will
use their own access methods to retrieve the vnode properties, and then
invoke genfs_can_access_acl_posix1e
() in order to
perform the actual check. Implementations of
VOP_ACCESS(9) may choose
to implement additional security mechanisms whose results will be composed
with the return value.
The algorithm used by
genfs_can_access_acl_posix1e
() is based on the
POSIX.1e ACL evaluation algorithm. The algorithm selects a
matching entry from the access ACL, which may then be
composed with an available ACL mask entry, providing
UNIX security compatibility.
Once appropriate protections are selected for the current credential, the requested access mode, in combination with the vnode type, will be compared with the discretionary rights available for the credential. If the rights granted by discretionary protections are insufficient, then super-user privilege, if available for the credential, will also be considered.
genfs_can_access_acl_posix1e
() will return 0 on success,
or a non-zero error value on failure.
genfs_can_access_acl_posix1e
() were written by
Robert Watson.
January 17, 2022 | NetBSD 10.0 |