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authorAurelien Aptel <aaptel@suse.com>2017-02-22 14:47:17 +0100
committerSteve French <smfrench@gmail.com>2017-03-02 17:04:58 -0600
commitf0712928be1a66c99c35f871b4df7fa23ec1574a (patch)
tree3262f33e0131838da803cc1e7c20da2605bbc6f3 /fs/cifs
parentb9043cc5b99e9c93596a28647fd9f526f5bfa22c (diff)
downloadlinux-f0712928be1a66c99c35f871b4df7fa23ec1574a.tar.bz2
CIFS: use DFS pathnames in SMB2+ Create requests
When connected to a DFS capable share, the client must set the SMB2_FLAGS_DFS_OPERATIONS flag in the SMB2 header and use DFS path names: "<server>\<share>\<path>" *without* leading \\. Sources: [MS-SMB2] 3.2.5.5 Receiving an SMB2 TREE_CONNECT Response > TreeConnect.IsDfsShare MUST be set to TRUE, if the SMB2_SHARE_CAP_DFS > bit is set in the Capabilities field of the response. [MS-SMB2] 3.2.4.3 Application Requests Opening a File > If TreeConnect.IsDfsShare is TRUE, the SMB2_FLAGS_DFS_OPERATIONS flag > is set in the Flags field. [MS-SMB2] 2.2.13 SMB2 CREATE Request, NameOffset: > If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of the SMB2 > header, the file name includes a prefix that will be processed during > DFS name normalization as specified in section 3.3.5.9. Otherwise, the > file name is relative to the share that is identified by the TreeId in > the SMB2 header. Signed-off-by: Aurelien Aptel <aaptel@suse.com> Acked-by: Pavel Shilovsky <pshilov@microsoft.com> Signed-off-by: Steve French <smfrench@gmail.com>
Diffstat (limited to 'fs/cifs')
-rw-r--r--fs/cifs/smb2pdu.c96
1 files changed, 80 insertions, 16 deletions
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index 2fd93eeed15a..2069431b32e3 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -1528,6 +1528,51 @@ add_durable_context(struct kvec *iov, unsigned int *num_iovec,
return 0;
}
+static int
+alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
+ const char *treename, const __le16 *path)
+{
+ int treename_len, path_len;
+ struct nls_table *cp;
+ const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
+
+ /*
+ * skip leading "\\"
+ */
+ treename_len = strlen(treename);
+ if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
+ return -EINVAL;
+
+ treename += 2;
+ treename_len -= 2;
+
+ path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
+
+ /*
+ * make room for one path separator between the treename and
+ * path
+ */
+ *out_len = treename_len + 1 + path_len;
+
+ /*
+ * final path needs to be null-terminated UTF16 with a
+ * size aligned to 8
+ */
+
+ *out_size = roundup((*out_len+1)*2, 8);
+ *out_path = kzalloc(*out_size, GFP_KERNEL);
+ if (!*out_path)
+ return -ENOMEM;
+
+ cp = load_nls_default();
+ cifs_strtoUTF16(*out_path, treename, treename_len, cp);
+ UniStrcat(*out_path, sep);
+ UniStrcat(*out_path, path);
+ unload_nls(cp);
+
+ return 0;
+}
+
int
SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
__u8 *oplock, struct smb2_file_all_info *buf,
@@ -1576,30 +1621,49 @@ SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
req->ShareAccess = FILE_SHARE_ALL_LE;
req->CreateDisposition = cpu_to_le32(oparms->disposition);
req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
- uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
- /* do not count rfc1001 len field */
- req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req) - 4);
iov[0].iov_base = (char *)req;
/* 4 for rfc1002 length field */
iov[0].iov_len = get_rfc1002_length(req) + 4;
-
- /* MUST set path len (NameLength) to 0 opening root of share */
- req->NameLength = cpu_to_le16(uni_path_len - 2);
/* -1 since last byte is buf[0] which is sent below (path) */
iov[0].iov_len--;
- if (uni_path_len % 8 != 0) {
- copy_size = uni_path_len / 8 * 8;
- if (copy_size < uni_path_len)
- copy_size += 8;
-
- copy_path = kzalloc(copy_size, GFP_KERNEL);
- if (!copy_path)
- return -ENOMEM;
- memcpy((char *)copy_path, (const char *)path,
- uni_path_len);
+
+ req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req) - 4);
+
+ /* [MS-SMB2] 2.2.13 NameOffset:
+ * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
+ * the SMB2 header, the file name includes a prefix that will
+ * be processed during DFS name normalization as specified in
+ * section 3.3.5.9. Otherwise, the file name is relative to
+ * the share that is identified by the TreeId in the SMB2
+ * header.
+ */
+ if (tcon->share_flags & SHI1005_FLAGS_DFS) {
+ int name_len;
+
+ req->hdr.sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
+ rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
+ &name_len,
+ tcon->treeName, path);
+ if (rc)
+ return rc;
+ req->NameLength = cpu_to_le16(name_len * 2);
uni_path_len = copy_size;
path = copy_path;
+ } else {
+ uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
+ /* MUST set path len (NameLength) to 0 opening root of share */
+ req->NameLength = cpu_to_le16(uni_path_len - 2);
+ if (uni_path_len % 8 != 0) {
+ copy_size = roundup(uni_path_len, 8);
+ copy_path = kzalloc(copy_size, GFP_KERNEL);
+ if (!copy_path)
+ return -ENOMEM;
+ memcpy((char *)copy_path, (const char *)path,
+ uni_path_len);
+ uni_path_len = copy_size;
+ path = copy_path;
+ }
}
iov[1].iov_len = uni_path_len;