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| author | Steve French <smfrench@gmail.com> | 2013-11-19 23:44:46 -0600 |
|---|---|---|
| committer | Steve French <smfrench@gmail.com> | 2013-11-19 23:52:54 -0600 |
| commit | ff1c038addc4f205d5f1ede449426c7d316c0eed (patch) | |
| tree | 6beb176bfee8d237bc06586474493f73702f0959 /fs/cifs/smbfsctl.h | |
| parent | 7d3fb24bce87a240ee5a5f99cdd72b1f336d5c3b (diff) | |
| download | linux-ff1c038addc4f205d5f1ede449426c7d316c0eed.tar.gz linux-ff1c038addc4f205d5f1ede449426c7d316c0eed.tar.bz2 linux-ff1c038addc4f205d5f1ede449426c7d316c0eed.zip | |
Check SMB3 dialects against downgrade attacks
When we are running SMB3 or SMB3.02 connections which are signed
we need to validate the protocol negotiation information,
to ensure that the negotiate protocol response was not tampered with.
Add the missing FSCTL which is sent at mount time (immediately after
the SMB3 Tree Connect) to validate that the capabilities match
what we think the server sent.
"Secure dialect negotiation is introduced in SMB3 to protect against
man-in-the-middle attempt to downgrade dialect negotiation.
The idea is to prevent an eavesdropper from downgrading the initially
negotiated dialect and capabilities between the client and the server."
For more explanation see 2.2.31.4 of MS-SMB2 or
http://blogs.msdn.com/b/openspecification/archive/2012/06/28/smb3-secure-dialect-negotiation.aspx
Reviewed-by: Pavel Shilovsky <piastry@etersoft.ru>
Signed-off-by: Steve French <smfrench@gmail.com>
Diffstat (limited to 'fs/cifs/smbfsctl.h')
| -rw-r--r-- | fs/cifs/smbfsctl.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/cifs/smbfsctl.h b/fs/cifs/smbfsctl.h index a4b2391fe66e..0e538b5c9622 100644 --- a/fs/cifs/smbfsctl.h +++ b/fs/cifs/smbfsctl.h @@ -90,7 +90,7 @@ #define FSCTL_LMR_REQUEST_RESILIENCY 0x001401D4 /* BB add struct */ #define FSCTL_LMR_GET_LINK_TRACK_INF 0x001400E8 /* BB add struct */ #define FSCTL_LMR_SET_LINK_TRACK_INF 0x001400EC /* BB add struct */ -#define FSCTL_VALIDATE_NEGOTIATE_INFO 0x00140204 /* BB add struct */ +#define FSCTL_VALIDATE_NEGOTIATE_INFO 0x00140204 /* Perform server-side data movement */ #define FSCTL_SRV_COPYCHUNK 0x001440F2 #define FSCTL_SRV_COPYCHUNK_WRITE 0x001480F2 |