Commit 67dbea2c authored Apr 12, 2017 by Pavel Shilovsky Committed by Steve French Apr 13, 2017

CIFS: Fix SMB3 mount without specifying a security mechanism



Commit ef65aaed ("smb2: Enforce sec= mount option") changed the
behavior of a mount command to enforce a specified security mechanism
during mounting. On another hand according to the spec if SMB3 server
doesn't respond with a security context it implies that it supports
NTLMSSP. The current code doesn't keep it in mind and fails a mount
for such servers if no security mechanism is specified. Fix this by
indicating that a server supports NTLMSSP if a security context isn't
returned during negotiate phase. This allows the code to use NTLMSSP
by default for SMB3 mounts.

Signed-off-by: Pavel Shilovsky <pshilov@microsoft.com>
Signed-off-by: Steve French <smfrench@gmail.com>

parent 1fa839b4

fs/cifs/smb2pdu.c

+3 −1

Original line number	Diff line number	Diff line
		@@ -562,8 +562,10 @@ SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
		* but for time being this is our only auth choice so doesn't matter.
		* We just found a server which sets blob length to zero expecting raw.
		*/
		if (blob_length == 0)
		if (blob_length == 0) {
		cifs_dbg(FYI, "missing security blob on negprot\n");
		server->sec_ntlmssp = true;
		}

		rc = cifs_enable_signing(server, ses->sign);
		if (rc)

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