[CIFS] Fix NTLMv2 mounts to Windows servers

Windows servers are pickier about NTLMv2 than Samba.
This enables more secure mounts to Windows (not just Samba)
ie when "sec=ntlmv2" is specified on the mount.

Signed-off-by: Steve French <sfrench@us.ibm.com>

fs/cifs/CHANGES

@@ -5,7 +5,8 @@ Allow null user to be specified on mount ("username="). Do not return
 EINVAL on readdir when filldir fails due to overwritten blocksize
 (fixes FC problem).  Return error in rename 2nd attempt retry (ie report
 if rename by handle also fails, after rename by path fails, we were
-not reporting whether the retry worked or not).
+not reporting whether the retry worked or not). Fix NTLMv2 to
+work to Windows servers (mount with option "sec=ntlmv2").
 
 Version 1.45
 ------------

fs/cifs/cifsencrypt.c

@@ -372,8 +372,10 @@ void setup_ntlmv2_rsp(struct cifsSesInfo * ses, char * resp_buf,
 	buf->time = cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
 	get_random_bytes(&buf->client_chal, sizeof(buf->client_chal));
 	buf->reserved2 = 0;
-	buf->names[0].type = 0;
+	buf->names[0].type = cpu_to_le16(NTLMSSP_DOMAIN_TYPE);
 	buf->names[0].length = 0;
+	buf->names[1].type = 0;
+	buf->names[1].length = 0;
 
 	/* calculate buf->ntlmv2_hash */
 	rc = calc_ntlmv2_hash(ses, nls_cp);

fs/cifs/cifspdu.h

@@ -580,6 +580,12 @@ typedef union smb_com_session_setup_andx {
 
 /* format of NLTMv2 Response ie "case sensitive password" hash when NTLMv2 */
 
+#define NTLMSSP_SERVER_TYPE	1
+#define NTLMSSP_DOMAIN_TYPE	2
+#define NTLMSSP_FQ_DOMAIN_TYPE	3
+#define NTLMSSP_DNS_DOMAIN_TYPE	4
+#define NTLMSSP_DNS_PARENT_TYPE	5
+
 struct ntlmssp2_name {
 	__le16 type;
 	__le16 length;
@@ -593,7 +599,7 @@ struct ntlmv2_resp {
 	__le64  time;
 	__u64  client_chal; /* random */
 	__u32  reserved2;
-	struct ntlmssp2_name names[1];
+	struct ntlmssp2_name names[2];
 	/* array of name entries could follow ending in minimum 4 byte struct */
 } __attribute__((packed));