2 * (The copyright below applies to ufs_access())
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40 * @(#)ufs_vnops.c 8.27 (Berkeley) 5/27/95
41 * $DragonFly: src/sys/kern/vfs_helper.c,v 1.5 2008/05/25 18:34:46 dillon Exp $
44 #include "opt_quota.h"
45 #include "opt_suiddir.h"
47 #include <sys/param.h>
48 #include <sys/systm.h>
49 #include <sys/kernel.h>
50 #include <sys/fcntl.h>
52 #include <sys/mount.h>
53 #include <sys/unistd.h>
54 #include <sys/vnode.h>
55 #include <sys/file.h> /* XXX */
62 * Provide standard UNIX semanics for VOP_ACCESS, but without the quota
63 * code. This procedure was basically pulled out of UFS.
66 vop_helper_access(struct vop_access_args *ap, uid_t ino_uid, gid_t ino_gid,
67 mode_t ino_mode, u_int32_t ino_flags)
69 struct vnode *vp = ap->a_vp;
70 struct ucred *cred = ap->a_cred;
71 mode_t mask, mode = ap->a_mode;
79 * Disallow write attempts on read-only filesystems;
80 * unless the file is a socket, fifo, or a block or
81 * character device resident on the filesystem.
89 if (vp->v_mount->mnt_flag & MNT_RDONLY)
92 /* check quota here XXX */
100 /* If immutable bit set, nobody gets to write it. */
101 if ((mode & VWRITE) && (ino_flags & IMMUTABLE))
104 /* Otherwise, user id 0 always gets access. */
105 if (cred->cr_uid == 0)
110 /* Otherwise, check the owner. */
111 if (cred->cr_uid == ino_uid) {
118 return ((ino_mode & mask) == mask ? 0 : EACCES);
121 /* Otherwise, check the groups. */
122 for (i = 0, gp = cred->cr_groups; i < cred->cr_ngroups; i++, gp++)
123 if (ino_gid == *gp) {
130 return ((ino_mode & mask) == mask ? 0 : EACCES);
133 /* Otherwise, check everyone else. */
140 return ((ino_mode & mask) == mask ? 0 : EACCES);
144 vop_helper_setattr_flags(u_int32_t *ino_flags, u_int32_t vaflags,
145 uid_t uid, struct ucred *cred)
150 * If uid doesn't match only the super-user can change the flags
152 if (cred->cr_uid != uid &&
153 (error = suser_cred(cred, PRISON_ROOT))) {
156 if (cred->cr_uid == 0 &&
157 (!jailed(cred)|| jail_chflags_allowed)) {
158 if ((*ino_flags & (SF_NOUNLINK|SF_IMMUTABLE|SF_APPEND)) &&
161 *ino_flags = vaflags;
163 if (*ino_flags & (SF_NOUNLINK|SF_IMMUTABLE|SF_APPEND) ||
164 (vaflags & UF_SETTABLE) != vaflags)
166 *ino_flags &= SF_SETTABLE;
167 *ino_flags |= vaflags & UF_SETTABLE;
173 * This helper function may be used by VFSs to implement UNIX initial
174 * ownership semantics when creating new objects inside directories.
177 vop_helper_create_uid(struct mount *mp, mode_t dmode, uid_t duid,
178 struct ucred *cred, mode_t *modep)
181 if ((mp->mnt_flag & MNT_SUIDDIR) && (dmode & S_ISUID) &&
182 duid != cred->cr_uid && duid) {
187 return(cred->cr_uid);
191 * This helper may be used by VFSs to implement unix chmod semantics.
194 vop_helper_chmod(struct vnode *vp, mode_t new_mode, struct ucred *cred,
195 uid_t cur_uid, gid_t cur_gid, mode_t *cur_modep)
199 if (cred->cr_uid != cur_uid) {
200 error = suser_cred(cred, PRISON_ROOT);
205 if (vp->v_type != VDIR && (*cur_modep & S_ISTXT))
207 if (!groupmember(cur_gid, cred) && (*cur_modep & S_ISGID))
210 *cur_modep &= ~ALLPERMS;
211 *cur_modep |= new_mode & ALLPERMS;
216 * This helper may be used by VFSs to implement unix chown semantics.
219 vop_helper_chown(struct vnode *vp, uid_t new_uid, gid_t new_gid,
221 uid_t *cur_uidp, gid_t *cur_gidp, mode_t *cur_modep)
227 if (new_uid == (uid_t)VNOVAL)
229 if (new_gid == (gid_t)VNOVAL)
233 * If we don't own the file, are trying to change the owner
234 * of the file, or are not a member of the target group,
235 * the caller must be superuser or the call fails.
237 if ((cred->cr_uid != *cur_uidp || new_uid != *cur_uidp ||
238 (new_gid != *cur_gidp && !(cred->cr_gid == new_gid ||
239 groupmember(new_gid, cred)))) &&
240 (error = suser_cred(cred, PRISON_ROOT))) {
249 if (cred->cr_uid != 0 && (ouid != new_uid || ogid != new_gid))
250 *cur_modep &= ~(S_ISUID | S_ISGID);