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[CIFS] Warn if SMB3 encryption required by server

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We do not support SMB3 encryption yet, warn if server responds
that SMB3 encryption is mandatory.

Signed-off-by: Steve French <smfrench@gmail.com>
This commit is contained in:
Steve French 2013-11-15 23:50:24 -06:00
parent b1d9335642
commit 0cbaa53cdd
2 changed files with 20 additions and 0 deletions
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2
fs/cifs/smb2pdu.c
View File

@ -630,6 +630,8 @@ SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
goto ssetup_exit;
ses->session_flags = le16_to_cpu(rsp->SessionFlags);
if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
cifs_dbg(VFS, "SMB3 encryption not supported yet\n");
ssetup_exit:
free_rsp_buf(resp_buftype, rsp);

18
fs/cifs/smb2pdu.h
View File

@ -122,6 +122,23 @@ struct smb2_pdu {
__le16 StructureSize2; /* size of wct area (varies, request specific) */
} __packed;
struct smb2_transform_hdr {
__be32 smb2_buf_length; /* big endian on wire */
/* length is only two or three bytes - with
one or two byte type preceding it that MBZ */
__u8 ProtocolId[4]; /* 0xFD 'S' 'M' 'B' */
__u8 Signature[16];
__u8 Nonce[11];
__u8 Reserved[5];
__le32 OriginalMessageSize;
__u16 Reserved1;
__le16 EncryptionAlgorithm;
__u64 SessionId;
} __packed;
/* Encryption Algorithms */
#define SMB2_ENCRYPTION_AES128_CCM __constant_cpu_to_le16(0x0001)
/*
* SMB2 flag definitions
*/
@ -237,6 +254,7 @@ struct smb2_sess_setup_req {
/* Currently defined SessionFlags */
#define SMB2_SESSION_FLAG_IS_GUEST 0x0001
#define SMB2_SESSION_FLAG_IS_NULL 0x0002
#define SMB2_SESSION_FLAG_ENCRYPT_DATA 0x0004
struct smb2_sess_setup_rsp {
struct smb2_hdr hdr;
__le16 StructureSize; /* Must be 9 */