[CIFS] ACL support part 8

Now GetACL in getinodeinfo path when cifsacl mount option used, and
ACL is parsed for SIDs.  Missing only one piece now to be able
to retrieve the mode

Signed-off-by: Steve French <sfrench@us.ibm.com>

1 files changed, 70 insertions, 63 deletions

diff --git a/fs/cifs/cifsacl.c b/fs/cifs/cifsacl.c
index 3a2d67b182d4..cad2da3a447d 100644
--- a/fs/cifs/cifsacl.c
+++ b/fs/cifs/cifsacl.c
@@ -155,69 +155,11 @@ static void access_flags_to_mode(__u32 ace_flags, umode_t *pmode,
                 *pmode |= (S_IXUGO & bits_to_set);
 
 #ifdef CONFIG_CIFS_DEBUG2
-        cFYI(1, ("access flags 0x%x mode now 0x%x", ace_flags, *pmode);
+        cFYI(1, ("access flags 0x%x mode now 0x%x", ace_flags, *pmode));
 #endif
         return;
 }
 
-/* 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 cifsFileInfo *open_file;
-        int unlock_file = FALSE;
-        int xid;
-        int rc = -EIO;
-        __u16 fid;
-        struct super_block *sb;
-        struct cifs_sb_info *cifs_sb;
-
-        cFYI(1, ("get mode from ACL for %s", path));
-        
-        if (inode == NULL)
-                return;
-
-        xid = GetXid();
-        open_file = find_readable_file(CIFS_I(inode));
-        if (open_file) {
-                unlock_file = TRUE;
-                fid = open_file->netfid;
-        } else {
-                int oplock = FALSE;
-                /* open file */
-                sb = inode->i_sb;
-                if (sb == NULL) {
-                        FreeXid(xid);
-                        return;
-                }
-                cifs_sb = CIFS_SB(sb);
-                rc = CIFSSMBOpen(xid, cifs_sb->tcon, path, FILE_OPEN,
-                                GENERIC_READ, 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;
-                }
-        }
-
-        /*   rc = CIFSSMBGetCIFSACL(xid, cifs_sb->tcon, fid, pntsd, acllen,
-                                    ACL_TYPE_ACCESS); */
-
-        if (unlock_file == TRUE)
-                atomic_dec(&open_file->wrtPending);
-        else
-                CIFSSMBClose(xid, cifs_sb->tcon, fid);
-
-/* parse ACEs e.g.
-        rc = parse_sec_desc(pntsd, acllen, inode);
-*/
-
-        FreeXid(xid);
-        return;
-}
-
 
 static void parse_ace(struct cifs_ace *pace, char *end_of_acl)
 {
@@ -314,12 +256,12 @@ static void parse_dacl(struct cifs_acl *pdacl, char *end_of_acl,
 
 static int parse_sid(struct cifs_sid *psid, char *end_of_acl)
 {
-
         /* BB need to add parm so we can store the SID BB */
 
-        /* validate that we do not go past end of acl */
-        if (end_of_acl < (char *)psid + sizeof(struct cifs_sid)) {
-                cERROR(1, ("ACL too small to parse SID"));
+        /* validate that we do not go past end of ACL - sid must be at least 8
+           bytes long (assuming no sub-auths - e.g. the null SID */
+        if (end_of_acl < (char *)psid + 8) {
+                cERROR(1, ("ACL too small to parse SID %p", psid));
                 return -EINVAL;
         }
 
@@ -354,6 +296,9 @@ static int parse_sec_desc(struct cifs_ntsd *pntsd, int acl_len,
         struct cifs_acl *dacl_ptr; /* no need for SACL ptr */
         char *end_of_acl = ((char *)pntsd) + acl_len;
 
+        if ((inode == NULL) || (pntsd == NULL))
+                return -EIO;
+
         owner_sid_ptr = (struct cifs_sid *)((char *)pntsd +
                                 le32_to_cpu(pntsd->osidoffset));
         group_sid_ptr = (struct cifs_sid *)((char *)pntsd +
@@ -368,6 +313,7 @@ static int parse_sec_desc(struct cifs_ntsd *pntsd, int acl_len,
                  le32_to_cpu(pntsd->sacloffset),
                  le32_to_cpu(pntsd->dacloffset)));
 #endif
+/*      cifs_dump_mem("owner_sid: ", owner_sid_ptr, 64); */
         rc = parse_sid(owner_sid_ptr, end_of_acl);
         if (rc)
                 return rc;
@@ -388,4 +334,65 @@ static int parse_sec_desc(struct cifs_ntsd *pntsd, int acl_len,
 
         return (0);
 }
+
+
+/* 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 cifsFileInfo *open_file;
+        int unlock_file = FALSE;
+        int xid;
+        int rc = -EIO;
+        __u16 fid;
+        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;
+
+        xid = GetXid();
+        open_file = find_readable_file(CIFS_I(inode));
+        sb = inode->i_sb;
+        if (sb == NULL) {
+                FreeXid(xid);
+                return;
+        }
+        cifs_sb = CIFS_SB(sb);
+
+        if (open_file) {
+                unlock_file = TRUE;
+                fid = open_file->netfid;
+        } else {
+                int oplock = FALSE;
+                /* open file */
+                rc = CIFSSMBOpen(xid, cifs_sb->tcon, path, FILE_OPEN,
+                                GENERIC_READ, 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;
+                }
+        }
+
+        rc = CIFSSMBGetCIFSACL(xid, cifs_sb->tcon, fid, &pntsd, &acllen);
+        cFYI(1, ("GetCIFSACL rc = %d ACL len %d", rc, acllen));
+        if (unlock_file == TRUE)
+                atomic_dec(&open_file->wrtPending);
+        else
+                CIFSSMBClose(xid, cifs_sb->tcon, fid);
+
+        /* parse ACEs */
+        if (!rc)
+                rc = parse_sec_desc(pntsd, acllen, inode);
+        kfree(pntsd);
+        FreeXid(xid);
+        return;
+}
 #endif /* CONFIG_CIFS_EXPERIMENTAL */