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Diffstat (limited to 'fs/cifs/cifsacl.c')
-rw-r--r--fs/cifs/cifsacl.c81
1 files changed, 65 insertions, 16 deletions
diff --git a/fs/cifs/cifsacl.c b/fs/cifs/cifsacl.c
index 1d377b7f2860..f842944a5c76 100644
--- a/fs/cifs/cifsacl.c
+++ b/fs/cifs/cifsacl.c
@@ -701,10 +701,9 @@ static void dump_ace(struct cifs_ace *pace, char *end_of_acl)
}
#endif
-
static void parse_dacl(struct cifs_acl *pdacl, char *end_of_acl,
struct cifs_sid *pownersid, struct cifs_sid *pgrpsid,
- struct cifs_fattr *fattr)
+ struct cifs_fattr *fattr, bool mode_from_special_sid)
{
int i;
int num_aces = 0;
@@ -757,22 +756,34 @@ static void parse_dacl(struct cifs_acl *pdacl, char *end_of_acl,
#ifdef CONFIG_CIFS_DEBUG2
dump_ace(ppace[i], end_of_acl);
#endif
- if (compare_sids(&(ppace[i]->sid), pownersid) == 0)
+ if (mode_from_special_sid &&
+ (compare_sids(&(ppace[i]->sid),
+ &sid_unix_NFS_mode) == 0)) {
+ /*
+ * Full permissions are:
+ * 07777 = S_ISUID | S_ISGID | S_ISVTX |
+ * S_IRWXU | S_IRWXG | S_IRWXO
+ */
+ fattr->cf_mode &= ~07777;
+ fattr->cf_mode |=
+ le32_to_cpu(ppace[i]->sid.sub_auth[2]);
+ break;
+ } else if (compare_sids(&(ppace[i]->sid), pownersid) == 0)
access_flags_to_mode(ppace[i]->access_req,
ppace[i]->type,
&fattr->cf_mode,
&user_mask);
- if (compare_sids(&(ppace[i]->sid), pgrpsid) == 0)
+ else if (compare_sids(&(ppace[i]->sid), pgrpsid) == 0)
access_flags_to_mode(ppace[i]->access_req,
ppace[i]->type,
&fattr->cf_mode,
&group_mask);
- if (compare_sids(&(ppace[i]->sid), &sid_everyone) == 0)
+ else if (compare_sids(&(ppace[i]->sid), &sid_everyone) == 0)
access_flags_to_mode(ppace[i]->access_req,
ppace[i]->type,
&fattr->cf_mode,
&other_mask);
- if (compare_sids(&(ppace[i]->sid), &sid_authusers) == 0)
+ else if (compare_sids(&(ppace[i]->sid), &sid_authusers) == 0)
access_flags_to_mode(ppace[i]->access_req,
ppace[i]->type,
&fattr->cf_mode,
@@ -795,22 +806,49 @@ 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;
+ u32 num_aces = 0;
struct cifs_acl *pnndacl;
pnndacl = (struct cifs_acl *)((char *)pndacl + sizeof(struct cifs_acl));
+ if (modefromsid) {
+ struct cifs_ace *pntace =
+ (struct cifs_ace *)((char *)pnndacl + size);
+ int i;
+
+ pntace->type = ACCESS_ALLOWED;
+ pntace->flags = 0x0;
+ pntace->access_req = 0;
+ pntace->sid.num_subauth = 3;
+ pntace->sid.revision = 1;
+ 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);
+
+ /* size = 1 + 1 + 2 + 4 + 1 + 1 + 6 + (psid->num_subauth*4) */
+ pntace->size = cpu_to_le16(28);
+ size += 28;
+ num_aces++;
+ }
+
size += fill_ace_for_sid((struct cifs_ace *) ((char *)pnndacl + size),
pownersid, nmode, S_IRWXU);
+ num_aces++;
size += fill_ace_for_sid((struct cifs_ace *)((char *)pnndacl + size),
pgrpsid, nmode, S_IRWXG);
+ num_aces++;
size += fill_ace_for_sid((struct cifs_ace *)((char *)pnndacl + size),
&sid_everyone, nmode, S_IRWXO);
+ num_aces++;
+ pndacl->num_aces = cpu_to_le32(num_aces);
pndacl->size = cpu_to_le16(size + sizeof(struct cifs_acl));
- pndacl->num_aces = cpu_to_le32(3);
return 0;
}
@@ -851,7 +889,8 @@ static int parse_sid(struct cifs_sid *psid, char *end_of_acl)
/* Convert CIFS ACL to POSIX form */
static int parse_sec_desc(struct cifs_sb_info *cifs_sb,
- struct cifs_ntsd *pntsd, int acl_len, struct cifs_fattr *fattr)
+ struct cifs_ntsd *pntsd, int acl_len, struct cifs_fattr *fattr,
+ bool get_mode_from_special_sid)
{
int rc = 0;
struct cifs_sid *owner_sid_ptr, *group_sid_ptr;
@@ -900,7 +939,7 @@ static int parse_sec_desc(struct cifs_sb_info *cifs_sb,
if (dacloffset)
parse_dacl(dacl_ptr, end_of_acl, owner_sid_ptr,
- group_sid_ptr, fattr);
+ group_sid_ptr, fattr, get_mode_from_special_sid);
else
cifs_dbg(FYI, "no ACL\n"); /* BB grant all or default perms? */
@@ -909,7 +948,8 @@ 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;
@@ -934,7 +974,7 @@ 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);
@@ -1128,8 +1168,8 @@ out:
/* Translate the CIFS ACL (similar to NTFS ACL) for a file into mode bits */
int
cifs_acl_to_fattr(struct cifs_sb_info *cifs_sb, struct cifs_fattr *fattr,
- struct inode *inode, const char *path,
- const struct cifs_fid *pfid)
+ struct inode *inode, bool mode_from_special_sid,
+ const char *path, const struct cifs_fid *pfid)
{
struct cifs_ntsd *pntsd = NULL;
u32 acllen = 0;
@@ -1156,8 +1196,11 @@ cifs_acl_to_fattr(struct cifs_sb_info *cifs_sb, struct cifs_fattr *fattr,
if (IS_ERR(pntsd)) {
rc = PTR_ERR(pntsd);
cifs_dbg(VFS, "%s: error %d getting sec desc\n", __func__, rc);
+ } else if (mode_from_special_sid) {
+ rc = parse_sec_desc(cifs_sb, pntsd, acllen, fattr, true);
} else {
- rc = parse_sec_desc(cifs_sb, pntsd, acllen, fattr);
+ /* get approximated mode from ACL */
+ rc = parse_sec_desc(cifs_sb, pntsd, acllen, fattr, false);
kfree(pntsd);
if (rc)
cifs_dbg(VFS, "parse sec desc failed rc = %d\n", rc);
@@ -1181,6 +1224,7 @@ 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);
@@ -1218,8 +1262,13 @@ 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);
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.