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Code Issues Releases Activity

Centralize the canonical vop_access user/group/other check in vaccess().

Browse Source 
Discussed with: bde
This commit is contained in:
Poul-Henning Kamp 2000-08-20 08:36:26 +00:00
parent a893217258
commit e39c53eda5
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=64865
12 changed files with 137 additions and 360 deletions
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45
sys/fs/cd9660/cd9660_vnops.c
View File

@ -135,10 +135,7 @@ cd9660_access(ap)
{
struct vnode *vp = ap->a_vp;
struct iso_node *ip = VTOI(vp);
struct ucred *cred = ap->a_cred;
mode_t mask, mode = ap->a_mode;
gid_t *gp;
int i;
mode_t mode = ap->a_mode;
/*
* Disallow write attempts unless the file is a socket,
@ -157,44 +154,8 @@ cd9660_access(ap)
}
}
/* User id 0 always gets access. */
if (cred->cr_uid == 0)
return (0);
mask = 0;
/* Otherwise, check the owner. */
if (cred->cr_uid == ip->inode.iso_uid) {
if (mode & VEXEC)
mask |= S_IXUSR;
if (mode & VREAD)
mask |= S_IRUSR;
if (mode & VWRITE)
mask |= S_IWUSR;
return ((ip->inode.iso_mode & mask) == mask ? 0 : EACCES);
}
/* Otherwise, check the groups. */
for (i = 0, gp = cred->cr_groups; i < cred->cr_ngroups; i++, gp++)
if (ip->inode.iso_gid == *gp) {
if (mode & VEXEC)
mask |= S_IXGRP;
if (mode & VREAD)
mask |= S_IRGRP;
if (mode & VWRITE)
mask |= S_IWGRP;
return ((ip->inode.iso_mode & mask) == mask ?
0 : EACCES);
}
/* Otherwise, check everyone else. */
if (mode & VEXEC)
mask |= S_IXOTH;
if (mode & VREAD)
mask |= S_IROTH;
if (mode & VWRITE)
mask |= S_IWOTH;
return ((ip->inode.iso_mode & mask) == mask ? 0 : EACCES);
return (vaccess(vp->v_type, ip->inode.iso_mode, ip->inode.iso_uid,
ip->inode.iso_gid, ap->a_mode, ap->a_cred));
}
static int

44
sys/fs/hpfs/hpfs_vnops.c
View File

@ -777,10 +777,7 @@ hpfs_access(ap)
{
struct vnode *vp = ap->a_vp;
struct hpfsnode *hp = VTOHP(vp);
struct ucred *cred = ap->a_cred;
mode_t mask, mode = ap->a_mode;
register gid_t *gp;
int i;
mode_t mode = ap->a_mode;
dprintf(("hpfs_access(0x%x):\n", hp->h_no));
@ -800,43 +797,8 @@ hpfs_access(ap)
}
}
/* Otherwise, user id 0 always gets access. */
if (cred->cr_uid == 0)
return (0);
mask = 0;
/* Otherwise, check the owner. */
if (cred->cr_uid == hp->h_uid) {
if (mode & VEXEC)
mask |= S_IXUSR;
if (mode & VREAD)
mask |= S_IRUSR;
if (mode & VWRITE)
mask |= S_IWUSR;
return ((hp->h_mode & mask) == mask ? 0 : EACCES);
}
/* Otherwise, check the groups. */
for (i = 0, gp = cred->cr_groups; i < cred->cr_ngroups; i++, gp++)
if (hp->h_gid == *gp) {
if (mode & VEXEC)
mask |= S_IXGRP;
if (mode & VREAD)
mask |= S_IRGRP;
if (mode & VWRITE)
mask |= S_IWGRP;
return ((hp->h_mode & mask) == mask ? 0 : EACCES);
}
/* Otherwise, check everyone else. */
if (mode & VEXEC)
mask |= S_IXOTH;
if (mode & VREAD)
mask |= S_IROTH;
if (mode & VWRITE)
mask |= S_IWOTH;
return ((hp->h_mode & mask) == mask ? 0 : EACCES);
return (vaccess(vp->v_type, hp->h_mode, hp->h_uid, hp->h_gid,
ap->a_mode, ap->a_cred));
}
/*

44
sys/fs/msdosfs/msdosfs_vnops.c
View File

@ -252,10 +252,7 @@ msdosfs_access(ap)
struct vnode *vp = ap->a_vp;
struct denode *dep = VTODE(ap->a_vp);
struct msdosfsmount *pmp = dep->de_pmp;
struct ucred *cred = ap->a_cred;
mode_t mask, file_mode, mode = ap->a_mode;
register gid_t *gp;
int i;
mode_t file_mode, mode = ap->a_mode;
file_mode = (S_IXUSR|S_IXGRP|S_IXOTH) | (S_IRUSR|S_IRGRP|S_IROTH) |
((dep->de_Attributes & ATTR_READONLY) ? 0 : (S_IWUSR|S_IWGRP|S_IWOTH));
@ -279,43 +276,8 @@ msdosfs_access(ap)
}
}
/* User id 0 always gets access. */
if (cred->cr_uid == 0)
return 0;
mask = 0;
/* Otherwise, check the owner. */
if (cred->cr_uid == pmp->pm_uid) {
if (mode & VEXEC)
mask |= S_IXUSR;
if (mode & VREAD)
mask |= S_IRUSR;
if (mode & VWRITE)
mask |= S_IWUSR;
return (file_mode & mask) == mask ? 0 : EACCES;
}
/* Otherwise, check the groups. */
for (i = 0, gp = cred->cr_groups; i < cred->cr_ngroups; i++, gp++)
if (pmp->pm_gid == *gp) {
if (mode & VEXEC)
mask |= S_IXGRP;
if (mode & VREAD)
mask |= S_IRGRP;
if (mode & VWRITE)
mask |= S_IWGRP;
return (file_mode & mask) == mask ? 0 : EACCES;
}
/* Otherwise, check everyone else. */
if (mode & VEXEC)
mask |= S_IXOTH;
if (mode & VREAD)
mask |= S_IROTH;
if (mode & VWRITE)
mask |= S_IWOTH;
return (file_mode & mask) == mask ? 0 : EACCES;
return (vaccess(vp->v_type, file_mode, pmp->pm_uid, pmp->pm_gid,
ap->a_mode, ap->a_cred));
}
static int

46
sys/fs/ntfs/ntfs_vnops.c
View File

@ -450,10 +450,7 @@ ntfs_access(ap)
{
struct vnode *vp = ap->a_vp;
struct ntnode *ip = VTONT(vp);
struct ucred *cred = ap->a_cred;
mode_t mask, mode = ap->a_mode;
register gid_t *gp;
int i;
mode_t mode = ap->a_mode;
#ifdef QUOTA
int error;
#endif
@ -480,44 +477,9 @@ ntfs_access(ap)
}
}
/* Otherwise, user id 0 always gets access. */
if (cred->cr_uid == 0)
return (0);
mask = 0;
/* Otherwise, check the owner. */
if (cred->cr_uid == ip->i_mp->ntm_uid) {
if (mode & VEXEC)
mask |= S_IXUSR;
if (mode & VREAD)
mask |= S_IRUSR;
if (mode & VWRITE)
mask |= S_IWUSR;
return ((ip->i_mp->ntm_mode & mask) == mask ? 0 : EACCES);
}
/* Otherwise, check the groups. */
for (i = 0, gp = cred->cr_groups; i < cred->cr_ngroups; i++, gp++)
if (ip->i_mp->ntm_gid == *gp) {
if (mode & VEXEC)
mask |= S_IXGRP;
if (mode & VREAD)
mask |= S_IRGRP;
if (mode & VWRITE)
mask |= S_IWGRP;
return ((ip->i_mp->ntm_mode&mask) == mask ? 0 : EACCES);
}
/* Otherwise, check everyone else. */
if (mode & VEXEC)
mask |= S_IXOTH;
if (mode & VREAD)
mask |= S_IROTH;
if (mode & VWRITE)
mask |= S_IWOTH;
return ((ip->i_mp->ntm_mode & mask) == mask ? 0 : EACCES);
}
return (vaccess(vp->v_type, ip->i_mp->ntm_mode, ip->i_mp->ntm_uid,
ip->i_mp->ntm_gid, ap->a_mode, ap->a_cred));
}
/*
* Open called.

45
sys/isofs/cd9660/cd9660_vnops.c
View File

@ -135,10 +135,7 @@ cd9660_access(ap)
{
struct vnode *vp = ap->a_vp;
struct iso_node *ip = VTOI(vp);
struct ucred *cred = ap->a_cred;
mode_t mask, mode = ap->a_mode;
gid_t *gp;
int i;
mode_t mode = ap->a_mode;
/*
* Disallow write attempts unless the file is a socket,
@ -157,44 +154,8 @@ cd9660_access(ap)
}
}
/* User id 0 always gets access. */
if (cred->cr_uid == 0)
return (0);
mask = 0;
/* Otherwise, check the owner. */
if (cred->cr_uid == ip->inode.iso_uid) {
if (mode & VEXEC)
mask |= S_IXUSR;
if (mode & VREAD)
mask |= S_IRUSR;
if (mode & VWRITE)
mask |= S_IWUSR;
return ((ip->inode.iso_mode & mask) == mask ? 0 : EACCES);
}
/* Otherwise, check the groups. */
for (i = 0, gp = cred->cr_groups; i < cred->cr_ngroups; i++, gp++)
if (ip->inode.iso_gid == *gp) {
if (mode & VEXEC)
mask |= S_IXGRP;
if (mode & VREAD)
mask |= S_IRGRP;
if (mode & VWRITE)
mask |= S_IWGRP;
return ((ip->inode.iso_mode & mask) == mask ?
0 : EACCES);
}
/* Otherwise, check everyone else. */
if (mode & VEXEC)
mask |= S_IXOTH;
if (mode & VREAD)
mask |= S_IROTH;
if (mode & VWRITE)
mask |= S_IWOTH;
return ((ip->inode.iso_mode & mask) == mask ? 0 : EACCES);
return (vaccess(vp->v_type, ip->inode.iso_mode, ip->inode.iso_uid,
ip->inode.iso_gid, ap->a_mode, ap->a_cred));
}
static int

54
sys/kern/vfs_export.c
View File

@ -2984,3 +2984,57 @@ NDFREE(ndp, flags)
ndp->ni_startdir = NULL;
}
}
int
vaccess(type, file_mode, uid, gid, acc_mode, cred)
enum vtype type;
mode_t file_mode;
uid_t uid;
gid_t gid;
mode_t acc_mode;
struct ucred *cred;
{
mode_t mask;
/*
* At this point, uid == 0 can do anything.
* XXX: should use suser() ? */
* XXX: Should only check root-ness after other checks fail.
*/
if (cred->cr_uid == 0)
return (0);
mask = 0;
/* Otherwise, check the owner. */
if (cred->cr_uid == uid) {
if (acc_mode & VEXEC)
mask |= S_IXUSR;
if (acc_mode & VREAD)
mask |= S_IRUSR;
if (acc_mode & VWRITE)
mask |= S_IWUSR;
return ((file_mode & mask) == mask ? 0 : EACCES);
}
/* Otherwise, check for all groups. */
if (groupmember(gid, cred)) {
if (acc_mode & VEXEC)
mask |= S_IXGRP;
if (acc_mode & VREAD)
mask |= S_IRGRP;
if (acc_mode & VWRITE)
mask |= S_IWGRP;
return ((file_mode & mask) == mask ? 0 : EACCES);
}
/* Otherwise, check everyone else. */
if (acc_mode & VEXEC)
mask |= S_IXOTH;
if (acc_mode & VREAD)
mask |= S_IROTH;
if (acc_mode & VWRITE)
mask |= S_IWOTH;
return ((file_mode & mask) == mask ? 0 : EACCES);
}

54
sys/kern/vfs_subr.c
View File

@ -2984,3 +2984,57 @@ NDFREE(ndp, flags)
ndp->ni_startdir = NULL;
}
}
int
vaccess(type, file_mode, uid, gid, acc_mode, cred)
enum vtype type;
mode_t file_mode;
uid_t uid;
gid_t gid;
mode_t acc_mode;
struct ucred *cred;
{
mode_t mask;
/*
* At this point, uid == 0 can do anything.
* XXX: should use suser() ? */
* XXX: Should only check root-ness after other checks fail.
*/
if (cred->cr_uid == 0)
return (0);
mask = 0;
/* Otherwise, check the owner. */
if (cred->cr_uid == uid) {
if (acc_mode & VEXEC)
mask |= S_IXUSR;
if (acc_mode & VREAD)
mask |= S_IRUSR;
if (acc_mode & VWRITE)
mask |= S_IWUSR;
return ((file_mode & mask) == mask ? 0 : EACCES);
}
/* Otherwise, check for all groups. */
if (groupmember(gid, cred)) {
if (acc_mode & VEXEC)
mask |= S_IXGRP;
if (acc_mode & VREAD)
mask |= S_IRGRP;
if (acc_mode & VWRITE)
mask |= S_IWGRP;
return ((file_mode & mask) == mask ? 0 : EACCES);
}
/* Otherwise, check everyone else. */
if (acc_mode & VEXEC)
mask |= S_IXOTH;
if (acc_mode & VREAD)
mask |= S_IROTH;
if (acc_mode & VWRITE)
mask |= S_IWOTH;
return ((file_mode & mask) == mask ? 0 : EACCES);
}

29
sys/miscfs/kernfs/kernfs_vnops.c
View File

@ -305,42 +305,15 @@ kernfs_access(ap)
} */ *ap;
{
register struct vnode *vp = ap->a_vp;
register struct ucred *cred = ap->a_cred;
mode_t amode = ap->a_mode;
mode_t fmode =
(vp->v_flag & VROOT) ? DIR_MODE : VTOKERN(vp)->kf_kt->kt_mode;
mode_t mask = 0;
register gid_t *gp;
int i;
/* Some files are simply not modifiable. */
if ((amode & VWRITE) && (fmode & (S_IWUSR|S_IWGRP|S_IWOTH)) == 0)
return (EPERM);
/* Root can do anything else. */
if (cred->cr_uid == 0)
return (0);
/* Check for group 0 (wheel) permissions. */
for (i = 0, gp = cred->cr_groups; i < cred->cr_ngroups; i++, gp++)
if (*gp == 0) {
if (amode & VEXEC)
mask |= S_IXGRP;
if (amode & VREAD)
mask |= S_IRGRP;
if (amode & VWRITE)
mask |= S_IWGRP;
return ((fmode & mask) == mask ? 0 : EACCES);
}
/* Otherwise, check everyone else. */
if (amode & VEXEC)
mask |= S_IXOTH;
if (amode & VREAD)
mask |= S_IROTH;
if (amode & VWRITE)
mask |= S_IWOTH;
return ((fmode & mask) == mask ? 0 : EACCES);
return (vaccess(vp->v_tag, fmode, 0, 0, ap->a_mode, ap->a_cred));
}
static int

44
sys/msdosfs/msdosfs_vnops.c
View File

@ -252,10 +252,7 @@ msdosfs_access(ap)
struct vnode *vp = ap->a_vp;
struct denode *dep = VTODE(ap->a_vp);
struct msdosfsmount *pmp = dep->de_pmp;
struct ucred *cred = ap->a_cred;
mode_t mask, file_mode, mode = ap->a_mode;
register gid_t *gp;
int i;
mode_t file_mode, mode = ap->a_mode;
file_mode = (S_IXUSR|S_IXGRP|S_IXOTH) | (S_IRUSR|S_IRGRP|S_IROTH) |
((dep->de_Attributes & ATTR_READONLY) ? 0 : (S_IWUSR|S_IWGRP|S_IWOTH));
@ -279,43 +276,8 @@ msdosfs_access(ap)
}
}
/* User id 0 always gets access. */
if (cred->cr_uid == 0)
return 0;
mask = 0;
/* Otherwise, check the owner. */
if (cred->cr_uid == pmp->pm_uid) {
if (mode & VEXEC)
mask |= S_IXUSR;
if (mode & VREAD)
mask |= S_IRUSR;
if (mode & VWRITE)
mask |= S_IWUSR;
return (file_mode & mask) == mask ? 0 : EACCES;
}
/* Otherwise, check the groups. */
for (i = 0, gp = cred->cr_groups; i < cred->cr_ngroups; i++, gp++)
if (pmp->pm_gid == *gp) {
if (mode & VEXEC)
mask |= S_IXGRP;
if (mode & VREAD)
mask |= S_IRGRP;
if (mode & VWRITE)
mask |= S_IWGRP;
return (file_mode & mask) == mask ? 0 : EACCES;
}
/* Otherwise, check everyone else. */
if (mode & VEXEC)
mask |= S_IXOTH;
if (mode & VREAD)
mask |= S_IROTH;
if (mode & VWRITE)
mask |= S_IWOTH;
return (file_mode & mask) == mask ? 0 : EACCES;
return (vaccess(vp->v_type, file_mode, pmp->pm_uid, pmp->pm_gid,
ap->a_mode, ap->a_cred));
}
static int

46
sys/ntfs/ntfs_vnops.c
View File

@ -450,10 +450,7 @@ ntfs_access(ap)
{
struct vnode *vp = ap->a_vp;
struct ntnode *ip = VTONT(vp);
struct ucred *cred = ap->a_cred;
mode_t mask, mode = ap->a_mode;
register gid_t *gp;
int i;
mode_t mode = ap->a_mode;
#ifdef QUOTA
int error;
#endif
@ -480,44 +477,9 @@ ntfs_access(ap)
}
}
/* Otherwise, user id 0 always gets access. */
if (cred->cr_uid == 0)
return (0);
mask = 0;
/* Otherwise, check the owner. */
if (cred->cr_uid == ip->i_mp->ntm_uid) {
if (mode & VEXEC)
mask |= S_IXUSR;
if (mode & VREAD)
mask |= S_IRUSR;
if (mode & VWRITE)
mask |= S_IWUSR;
return ((ip->i_mp->ntm_mode & mask) == mask ? 0 : EACCES);
}
/* Otherwise, check the groups. */
for (i = 0, gp = cred->cr_groups; i < cred->cr_ngroups; i++, gp++)
if (ip->i_mp->ntm_gid == *gp) {
if (mode & VEXEC)
mask |= S_IXGRP;
if (mode & VREAD)
mask |= S_IRGRP;
if (mode & VWRITE)
mask |= S_IWGRP;
return ((ip->i_mp->ntm_mode&mask) == mask ? 0 : EACCES);
}
/* Otherwise, check everyone else. */
if (mode & VEXEC)
mask |= S_IXOTH;
if (mode & VREAD)
mask |= S_IROTH;
if (mode & VWRITE)
mask |= S_IWOTH;
return ((ip->i_mp->ntm_mode & mask) == mask ? 0 : EACCES);
}
return (vaccess(vp->v_type, ip->i_mp->ntm_mode, ip->i_mp->ntm_uid,
ip->i_mp->ntm_gid, ap->a_mode, ap->a_cred));
}
/*
* Open called.

2
sys/sys/vnode.h
View File

@ -554,6 +554,8 @@ int lease_check __P((struct vop_lease_args *ap));
int spec_vnoperate __P((struct vop_generic_args *));
int speedup_syncer __P((void));
int textvp_fullpath __P((struct proc *p, char **retbuf, char **retfreebuf));
int vaccess __P((enum vtype type, mode_t file_mode, uid_t uid, gid_t gid,
mode_t acc_mode, struct ucred *cred));
void vattr_null __P((struct vattr *vap));
int vcount __P((struct vnode *vp));
void vdrop __P((struct vnode *));

44
sys/ufs/ufs/ufs_vnops.c
View File

@ -300,10 +300,7 @@ ufs_access(ap)
{
struct vnode *vp = ap->a_vp;
struct inode *ip = VTOI(vp);
struct ucred *cred = ap->a_cred;
mode_t mask, mode = ap->a_mode;
register gid_t *gp;
int i;
mode_t mode = ap->a_mode;
#ifdef QUOTA
int error;
#endif
@ -334,43 +331,8 @@ ufs_access(ap)
if ((mode & VWRITE) && (ip->i_flags & (IMMUTABLE | SF_SNAPSHOT)))
return (EPERM);
/* Otherwise, user id 0 always gets access. */
if (cred->cr_uid == 0)
return (0);
mask = 0;
/* Otherwise, check the owner. */
if (cred->cr_uid == ip->i_uid) {
if (mode & VEXEC)
mask |= S_IXUSR;
if (mode & VREAD)
mask |= S_IRUSR;
if (mode & VWRITE)
mask |= S_IWUSR;
return ((ip->i_mode & mask) == mask ? 0 : EACCES);
}
/* Otherwise, check the groups. */
for (i = 0, gp = cred->cr_groups; i < cred->cr_ngroups; i++, gp++)
if (ip->i_gid == *gp) {
if (mode & VEXEC)
mask |= S_IXGRP;
if (mode & VREAD)
mask |= S_IRGRP;
if (mode & VWRITE)
mask |= S_IWGRP;
return ((ip->i_mode & mask) == mask ? 0 : EACCES);
}
/* Otherwise, check everyone else. */
if (mode & VEXEC)
mask |= S_IXOTH;
if (mode & VREAD)
mask |= S_IROTH;
if (mode & VWRITE)
mask |= S_IWOTH;
return ((ip->i_mode & mask) == mask ? 0 : EACCES);
return (vaccess(vp->v_type, ip->i_mode, ip->i_uid, ip->i_gid,
ap->a_mode, ap->a_cred));
}
/* ARGSUSED */