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authorSteve French <stfrench@microsoft.com>2019-07-19 08:15:55 +0000
committerSteve French <stfrench@microsoft.com>2019-09-16 11:43:37 -0500
commit22442179a5bb8c62c978cdb686cfb3a8f6d110d8 (patch)
tree514b8a191364f6537e755a9964ac90a777a9506a /fs/cifs/cifsacl.c
parente2f8fbfb8d09c06decde162090fac3ee220aa280 (diff)
cifs: allow chmod to set mode bits using special sid
When mounting with "modefromsid" set mode bits (chmod) by adding ACE with special SID (S-1-5-88-3-<mode>) to the ACL. Subsequent patch will fix setting default mode on file create and mkdir. See See e.g. https://docs.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2008-R2-and-2008/hh509017(v=ws.10) Signed-off-by: Steve French <stfrench@microsoft.com>
Diffstat (limited to 'fs/cifs/cifsacl.c')
-rw-r--r--fs/cifs/cifsacl.c42
1 files changed, 37 insertions, 5 deletions
diff --git a/fs/cifs/cifsacl.c b/fs/cifs/cifsacl.c
index 7fe4509e6c03..3e0c5ed9ca20 100644
--- a/fs/cifs/cifsacl.c
+++ b/fs/cifs/cifsacl.c
@@ -806,7 +806,7 @@ static void parse_dacl(struct cifs_acl *pdacl, char *end_of_acl,
static int set_chmod_dacl(struct cifs_acl *pndacl, struct cifs_sid *pownersid,
- struct cifs_sid *pgrpsid, __u64 nmode)
+ struct cifs_sid *pgrpsid, __u64 nmode, bool modefromsid)
{
u16 size = 0;
struct cifs_acl *pnndacl;
@@ -820,8 +820,33 @@ static int set_chmod_dacl(struct cifs_acl *pndacl, struct cifs_sid *pownersid,
size += fill_ace_for_sid((struct cifs_ace *)((char *)pnndacl + size),
&sid_everyone, nmode, S_IRWXO);
+ /* TBD: Move this ACE to the top of ACE list instead of bottom */
+ if (modefromsid) {
+ struct cifs_ace *pntace =
+ (struct cifs_ace *)((char *)pnndacl + size);
+ int i;
+
+ pntace->type = ACCESS_DENIED;
+ pntace->flags = 0x0;
+ pntace->sid.num_subauth = 3;
+ pntace->sid.revision = 1;
+ /* size = 1 + 1 + 2 + 4 + 1 + 1 + 6 + (psid->num_subauth * 4) */
+ pntace->size = cpu_to_le16(28);
+ size += 28;
+ for (i = 0; i < NUM_AUTHS; i++)
+ pntace->sid.authority[i] =
+ sid_unix_NFS_mode.authority[i];
+ pntace->sid.sub_auth[0] = sid_unix_NFS_mode.sub_auth[0];
+ pntace->sid.sub_auth[1] = sid_unix_NFS_mode.sub_auth[1];
+ pntace->sid.sub_auth[2] = cpu_to_le32(nmode & 07777);
+
+ pndacl->num_aces = cpu_to_le32(4);
+ size += fill_ace_for_sid((struct cifs_ace *)((char *)pnndacl + size),
+ &sid_unix_NFS_mode, nmode, S_IRWXO);
+ } else
+ pndacl->num_aces = cpu_to_le32(3);
+
pndacl->size = cpu_to_le16(size + sizeof(struct cifs_acl));
- pndacl->num_aces = cpu_to_le32(3);
return 0;
}
@@ -921,7 +946,8 @@ static int parse_sec_desc(struct cifs_sb_info *cifs_sb,
/* Convert permission bits from mode to equivalent CIFS ACL */
static int build_sec_desc(struct cifs_ntsd *pntsd, struct cifs_ntsd *pnntsd,
- __u32 secdesclen, __u64 nmode, kuid_t uid, kgid_t gid, int *aclflag)
+ __u32 secdesclen, __u64 nmode, kuid_t uid, kgid_t gid,
+ bool mode_from_sid, int *aclflag)
{
int rc = 0;
__u32 dacloffset;
@@ -946,7 +972,7 @@ static int build_sec_desc(struct cifs_ntsd *pntsd, struct cifs_ntsd *pnntsd,
ndacl_ptr->num_aces = 0;
rc = set_chmod_dacl(ndacl_ptr, owner_sid_ptr, group_sid_ptr,
- nmode);
+ nmode, mode_from_sid);
sidsoffset = ndacloffset + le16_to_cpu(ndacl_ptr->size);
/* copy sec desc control portion & owner and group sids */
copy_sec_desc(pntsd, pnntsd, sidsoffset);
@@ -1196,6 +1222,7 @@ id_mode_to_cifs_acl(struct inode *inode, const char *path, __u64 nmode,
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
struct tcon_link *tlink = cifs_sb_tlink(cifs_sb);
struct smb_version_operations *ops;
+ bool mode_from_sid;
if (IS_ERR(tlink))
return PTR_ERR(tlink);
@@ -1233,8 +1260,13 @@ id_mode_to_cifs_acl(struct inode *inode, const char *path, __u64 nmode,
return -ENOMEM;
}
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID)
+ mode_from_sid = true;
+ else
+ mode_from_sid = false;
+
rc = build_sec_desc(pntsd, pnntsd, secdesclen, nmode, uid, gid,
- &aclflag);
+ mode_from_sid, &aclflag);
cifs_dbg(NOISY, "build_sec_desc rc: %d\n", rc);