pmode is the existing mode (we only want to overwrite part of this
bits to set can be: S_IRWXU, S_IRWXG or S_IRWXO ie 00700 or 00070 or 00007
*/
-static void access_flags_to_mode(__u32 ace_flags, umode_t *pmode,
- umode_t bits_to_set)
+static void access_flags_to_mode(__u32 ace_flags, int type, umode_t *pmode,
+ umode_t *pbits_to_set)
{
+ /* the order of ACEs is important. The canonical order is to begin with
+ DENY entries then follow with ALLOW, otherwise an allow entry could be
+ encountered first, making the subsequent deny entry like "dead code"
+ which would be superflous since Windows stops when a match is made
+ for the operation you are trying to perform for your user */
+
+ /* For deny ACEs we change the mask so that subsequent allow access
+ control entries do not turn on the bits we are denying */
+ if (type == ACCESS_DENIED) {
+ if (ace_flags & GENERIC_ALL) {
+ *pbits_to_set &= ~S_IRWXUGO;
+ }
+ if ((ace_flags & GENERIC_WRITE) ||
+ ((ace_flags & FILE_WRITE_RIGHTS) == FILE_WRITE_RIGHTS))
+ *pbits_to_set &= ~S_IWUGO;
+ if ((ace_flags & GENERIC_READ) ||
+ ((ace_flags & FILE_READ_RIGHTS) == FILE_READ_RIGHTS))
+ *pbits_to_set &= ~S_IRUGO;
+ if ((ace_flags & GENERIC_EXECUTE) ||
+ ((ace_flags & FILE_EXEC_RIGHTS) == FILE_EXEC_RIGHTS))
+ *pbits_to_set &= ~S_IXUGO;
+ return;
+ } else if (type != ACCESS_ALLOWED) {
+ cERROR(1, ("unknown access control type %d", type));
+ return;
+ }
+ /* else ACCESS_ALLOWED type */
if (ace_flags & GENERIC_ALL) {
- *pmode |= (S_IRWXUGO & bits_to_set);
+ *pmode |= (S_IRWXUGO & (*pbits_to_set));
#ifdef CONFIG_CIFS_DEBUG2
cFYI(1, ("all perms"));
#endif
}
if ((ace_flags & GENERIC_WRITE) ||
((ace_flags & FILE_WRITE_RIGHTS) == FILE_WRITE_RIGHTS))
- *pmode |= (S_IWUGO & bits_to_set);
+ *pmode |= (S_IWUGO & (*pbits_to_set));
if ((ace_flags & GENERIC_READ) ||
((ace_flags & FILE_READ_RIGHTS) == FILE_READ_RIGHTS))
- *pmode |= (S_IRUGO & bits_to_set);
+ *pmode |= (S_IRUGO & (*pbits_to_set));
if ((ace_flags & GENERIC_EXECUTE) ||
((ace_flags & FILE_EXEC_RIGHTS) == FILE_EXEC_RIGHTS))
- *pmode |= (S_IXUGO & bits_to_set);
+ *pmode |= (S_IXUGO & (*pbits_to_set));
#ifdef CONFIG_CIFS_DEBUG2
cFYI(1, ("access flags 0x%x mode now 0x%x", ace_flags, *pmode));
}
-static void parse_ace(struct cifs_ace *pace, char *end_of_acl)
+#ifdef CONFIG_CIFS_DEBUG2
+static void dump_ace(struct cifs_ace *pace, char *end_of_acl)
{
int num_subauth;
num_subauth = pace->sid.num_subauth;
if (num_subauth) {
-#ifdef CONFIG_CIFS_DEBUG2
int i;
cFYI(1, ("ACE revision %d num_auth %d type %d flags %d size %d",
pace->sid.revision, pace->sid.num_subauth, pace->type,
/* BB add length check to make sure that we do not have huge
num auths and therefore go off the end */
-#endif
}
return;
}
+#endif
static void parse_dacl(struct cifs_acl *pdacl, char *end_of_acl,
le32_to_cpu(pdacl->num_aces)));
#endif
+ /* reset rwx permissions for user/group/other.
+ Also, if num_aces is 0 i.e. DACL has no ACEs,
+ user/group/other have no permissions */
+ inode->i_mode &= ~(S_IRWXUGO);
+
+ if (!pdacl) {
+ /* no DACL in the security descriptor, set
+ all the permissions for user/group/other */
+ inode->i_mode |= S_IRWXUGO;
+ return;
+ }
acl_base = (char *)pdacl;
acl_size = sizeof(struct cifs_acl);
num_aces = le32_to_cpu(pdacl->num_aces);
if (num_aces > 0) {
+ umode_t user_mask = S_IRWXU;
+ umode_t group_mask = S_IRWXG;
+ umode_t other_mask = S_IRWXO;
+
ppace = kmalloc(num_aces * sizeof(struct cifs_ace *),
GFP_KERNEL);
cifscred->aces = kmalloc(num_aces *
sizeof(struct cifs_ace *), GFP_KERNEL);*/
- /* reset rwx permissions for user/group/other */
- inode->i_mode &= ~(S_IRWXUGO);
-
for (i = 0; i < num_aces; ++i) {
ppace[i] = (struct cifs_ace *) (acl_base + acl_size);
-
- parse_ace(ppace[i], end_of_acl);
-
+#ifdef CONFIG_CIFS_DEBUG2
+ dump_ace(ppace[i], end_of_acl);
+#endif
if (compare_sids(&(ppace[i]->sid), pownersid))
access_flags_to_mode(ppace[i]->access_req,
- &(inode->i_mode), S_IRWXU);
+ ppace[i]->type,
+ &(inode->i_mode),
+ &user_mask);
if (compare_sids(&(ppace[i]->sid), pgrpsid))
access_flags_to_mode(ppace[i]->access_req,
- &(inode->i_mode), S_IRWXG);
+ ppace[i]->type,
+ &(inode->i_mode),
+ &group_mask);
if (compare_sids(&(ppace[i]->sid), &sid_everyone))
access_flags_to_mode(ppace[i]->access_req,
- &(inode->i_mode), S_IRWXO);
+ ppace[i]->type,
+ &(inode->i_mode),
+ &other_mask);
/* memcpy((void *)(&(cifscred->aces[i])),
(void *)ppace[i],
struct cifs_sid *owner_sid_ptr, *group_sid_ptr;
struct cifs_acl *dacl_ptr; /* no need for SACL ptr */
char *end_of_acl = ((char *)pntsd) + acl_len;
+ __u32 dacloffset;
if ((inode == NULL) || (pntsd == NULL))
return -EIO;
le32_to_cpu(pntsd->osidoffset));
group_sid_ptr = (struct cifs_sid *)((char *)pntsd +
le32_to_cpu(pntsd->gsidoffset));
- dacl_ptr = (struct cifs_acl *)((char *)pntsd +
- le32_to_cpu(pntsd->dacloffset));
+ dacloffset = le32_to_cpu(pntsd->dacloffset);
+ dacl_ptr = (struct cifs_acl *)((char *)pntsd + dacloffset);
#ifdef CONFIG_CIFS_DEBUG2
cFYI(1, ("revision %d type 0x%x ooffset 0x%x goffset 0x%x "
"sacloffset 0x%x dacloffset 0x%x",
pntsd->revision, pntsd->type, le32_to_cpu(pntsd->osidoffset),
le32_to_cpu(pntsd->gsidoffset),
- le32_to_cpu(pntsd->sacloffset),
- le32_to_cpu(pntsd->dacloffset)));
+ le32_to_cpu(pntsd->sacloffset), dacloffset));
#endif
/* cifs_dump_mem("owner_sid: ", owner_sid_ptr, 64); */
rc = parse_sid(owner_sid_ptr, end_of_acl);
if (rc)
return rc;
- parse_dacl(dacl_ptr, end_of_acl, owner_sid_ptr, group_sid_ptr, inode);
+ if (dacloffset)
+ parse_dacl(dacl_ptr, end_of_acl, owner_sid_ptr,
+ group_sid_ptr, inode);
+ else
+ cFYI(1, ("no ACL")); /* BB grant all or default perms? */
/* cifscred->uid = owner_sid_ptr->rid;
cifscred->gid = group_sid_ptr->rid;
}
-/* Translate the CIFS ACL (simlar to NTFS ACL) for a file into mode bits */
-
-void acl_to_uid_mode(struct inode *inode, const char *path)
+/* Retrieve an ACL from the server */
+static struct cifs_ntsd *get_cifs_acl(u32 *pacllen, struct inode *inode,
+ const char *path)
{
struct cifsFileInfo *open_file;
int unlock_file = FALSE;
struct super_block *sb;
struct cifs_sb_info *cifs_sb;
struct cifs_ntsd *pntsd = NULL;
- __u32 acllen;
cFYI(1, ("get mode from ACL for %s", path));
if (inode == NULL)
- return;
+ return NULL;
xid = GetXid();
open_file = find_readable_file(CIFS_I(inode));
sb = inode->i_sb;
if (sb == NULL) {
FreeXid(xid);
- return;
+ return NULL;
}
cifs_sb = CIFS_SB(sb);
int oplock = FALSE;
/* open file */
rc = CIFSSMBOpen(xid, cifs_sb->tcon, path, FILE_OPEN,
- GENERIC_READ, 0, &fid, &oplock, NULL,
+ READ_CONTROL, 0, &fid, &oplock, NULL,
cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
CIFS_MOUNT_MAP_SPECIAL_CHR);
if (rc != 0) {
cERROR(1, ("Unable to open file to get ACL"));
FreeXid(xid);
- return;
+ return NULL;
}
}
- rc = CIFSSMBGetCIFSACL(xid, cifs_sb->tcon, fid, &pntsd, &acllen);
- cFYI(1, ("GetCIFSACL rc = %d ACL len %d", rc, acllen));
+ rc = CIFSSMBGetCIFSACL(xid, cifs_sb->tcon, fid, &pntsd, pacllen);
+ cFYI(1, ("GetCIFSACL rc = %d ACL len %d", rc, *pacllen));
if (unlock_file == TRUE)
atomic_dec(&open_file->wrtPending);
else
CIFSSMBClose(xid, cifs_sb->tcon, fid);
- /* parse ACEs */
- if (!rc)
+ FreeXid(xid);
+ return pntsd;
+}
+
+/* Translate the CIFS ACL (simlar to NTFS ACL) for a file into mode bits */
+void acl_to_uid_mode(struct inode *inode, const char *path)
+{
+ struct cifs_ntsd *pntsd = NULL;
+ u32 acllen = 0;
+ int rc = 0;
+
+#ifdef CONFIG_CIFS_DEBUG2
+ cFYI(1, ("converting ACL to mode for %s", path));
+#endif
+ pntsd = get_cifs_acl(&acllen, inode, path);
+
+ /* if we can retrieve the ACL, now parse Access Control Entries, ACEs */
+ if (pntsd)
rc = parse_sec_desc(pntsd, acllen, inode);
+ if (rc)
+ cFYI(1, ("parse sec desc failed rc = %d", rc));
+
kfree(pntsd);
- FreeXid(xid);
return;
}
+
+/* Convert mode bits to an ACL so we can update the ACL on the server */
+int mode_to_acl(struct inode *inode, const char *path)
+{
+ int rc = 0;
+ __u32 acllen = 0;
+ struct cifs_ntsd *pntsd = NULL;
+
+ cFYI(1, ("set ACL from mode for %s", path));
+
+ /* Get the security descriptor */
+ pntsd = get_cifs_acl(&acllen, inode, path);
+
+ /* Add/Modify the three ACEs for owner, group, everyone
+ while retaining the other ACEs */
+
+ /* Set the security descriptor */
+
+
+ kfree(pntsd);
+ return rc;
+}
#endif /* CONFIG_CIFS_EXPERIMENTAL */
git.openpandora.org / pandora-kernel.git / blobdiff