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CIFS: Fix SMB3 mount without specifying a security mechanism 

Commit ef65aaede2 ("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>
This commit is contained in:
Pavel Shilovsky 2017-04-12 13:32:07 -07:00 committed by Steve French
parent 1fa839b498
commit 67dbea2ce6
1 changed files with 3 additions and 1 deletions
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4
fs/cifs/smb2pdu.c
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@ -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)