GENFS(9) | Kernel Developer's Manual | GENFS(9)

# NAME

`genfs` — genfs routines

# SYNOPSIS

`#include <miscfs/genfs/genfs.h>`

int
`genfs_can_chflags`(vnode_t *vp, kauth_cred_t, cred", uid_t owner_uid, bool changing_sysflags);

int
`genfs_can_chmod`(vnode_t *vp, kauth_cred_t cred, uid_t cur_uid, gid_t cur_gid, mode_t new_mode);

int
`genfs_can_chown`(vnode_t *vp, kauth_cred_t cred, uid_t cur_uid, gid_t cur_gid, uid_t new_uid, gid_t new_gid);

int
`genfs_can_chtimes`(vnode_t *vp, kauth_cred_t cred, uid_t owner_uid, u_int vaflags);

int
`genfs_can_extattr`(vnode_t *vp, kauth_cred_t cred, accmode_t accmode, int attrnamespace);

int
`genfs_can_sticky`(vnode_t *vp, kauth_cred_t cred, uid_t dir_uid, uid_t file_uid);

# DESCRIPTION

The functions documented here are general routines for internal use in file systems to implement common policies for performing various operations. The developer must understand that these routines implement no system-wide policies and only take into account the object being accessed and the nominal values of the credentials accessing it.

In other words, these functions are not meant to be called directly. They are intended to be used in kauth(9) vnode scope authorization calls, for providing the fall-back file system decision.

As a rule of thumb, code that looks like this is wrong:

    error = genfs_can_foo(...); /* WRONG */

While code that looks like this is right:

    error = kauth_authorize_vnode(..., genfs_can_foo(...));

# FUNCTIONS

`genfs_can_chflags`(vnode_t *vp, kauth_cred_t cred)
  "uid_t owner_uid" "bool changing_sysflags" Implements chflags(2) policy.
`genfs_can_chmod`(vnode_t *vp, kauth_cred_t cred, uid_t cur_uid, gid_t cur_gid, mode_t new_mode)
  Implements chmod(2) policy.
`genfs_can_chown`(vnode_t *vp, kauth_cred_t cred, uid_t cur_uid, gid_t cur_gid, uid_t new_uid, gid_t new_gid)
  Implements chown(2) policy.
`genfs_can_chtimes`(vnode_t *vp, kauth_cred_t cred, uid_t owner_uid, u_int vaflags)
  Implements utimes(2) policy.
`genfs_can_extattr`(vnode_t *vp, kauth_cred_t cred, accmode_t accmode, int attrnamespace)
  Implements extended attributes access policy.
`genfs_can_sticky`(vnode_t *vp, kauth_cred_t cred, uid_t dir_uid, uid_t file_uid)
  Implements rename and delete policy from sticky directories.

# SEE ALSO

genfs_can_access(9), genfs_can_access_acl_nfs4(9), genfs_can_access_acl_posix1e(9), genfs_rename(9), kauth(9)

# AUTHORS

Elad Efrat <elad@NetBSD.org> wrote this manual page.

January 17, 2022 | NetBSD 11.0