r13860: - add support for SMB2 ("SMB 2.001") negotiation in SMB negprot requests

- the default max protocol is still NT1

metze
(This used to be commit d1bae931b327dda28e648efc473e0462cf036f7c)

3 files changed, 86 insertions, 3 deletions

diff --git a/source4/smb_server/smb/negprot.c b/source4/smb_server/smb/negprot.c
index b2f136f4f7..61be84ca18 100644
--- a/source4/smb_server/smb/negprot.c
+++ b/source4/smb_server/smb/negprot.c
@@ -21,7 +21,10 @@
 #include "includes.h"
 #include "auth/auth.h"
 #include "smb_server/smb_server.h"
+#include "libcli/smb2/smb2.h"
+#include "smb_server/smb2/smb2_server.h"
 #include "smbd/service_stream.h"
+#include "lib/stream/packet.h"
 
 
 /* initialise the auth_context for this server and return the cryptkey */
@@ -415,7 +418,33 @@ static void reply_nt1(struct smbsrv_request *req, uint16_t choice)
 	req_send_reply_nosign(req);	
 }
 
- 
+/*
+ after a SMB2 2.001 negprot reply to a SMB negprot request
+ no (SMB or SMB2) requests are allowed anymore,
+ vista resets the connection in this case 
+*/
+static NTSTATUS smbsrv_recv_disabled_request(void *private, DATA_BLOB blob)
+{
+	struct smbsrv_connection *smb_conn = talloc_get_type(private, struct smbsrv_connection);
+	smbsrv_terminate_connection(smb_conn, "Receive Packet after SMB -> SMB2 negprot");
+	return NT_STATUS_OK;
+}
+
+/****************************************************************************
+ Reply for the SMB2 2.001 protocol
+****************************************************************************/
+static void reply_smb2(struct smbsrv_request *req, uint16_t choice)
+{
+	struct smbsrv_connection *smb_conn = req->smb_conn;
+
+	/* reply with a SMB2 packet */
+	smb2srv_reply_smb_negprot(req);
+	req = NULL;
+
+	/* disallow requests */
+	packet_set_callback(smb_conn->packet, smbsrv_recv_disabled_request);
+}
+
 /* List of supported protocols, most desired first */
 static const struct {
 	const char *proto_name;
@@ -423,6 +452,7 @@ static const struct {
 	void (*proto_reply_fn)(struct smbsrv_request *req, uint16_t choice);
 	int protocol_level;
 } supported_protocols[] = {
+	{"SMB 2.001",			"SMB2",		reply_smb2,	PROTOCOL_SMB2},
 	{"NT LANMAN 1.0",		"NT1",		reply_nt1,	PROTOCOL_NT1},
 	{"NT LM 0.12",			"NT1",		reply_nt1,	PROTOCOL_NT1},
 	{"LANMAN2.1",			"LANMAN2",	reply_lanman2,	PROTOCOL_LANMAN2},
diff --git a/source4/smb_server/smb2/negprot.c b/source4/smb_server/smb2/negprot.c
index 71e86ad805..6aab25427f 100644
--- a/source4/smb_server/smb2/negprot.c
+++ b/source4/smb_server/smb2/negprot.c
@@ -173,3 +173,56 @@ void smb2srv_negprot_recv(struct smb2srv_request *req)
 	}
 	smb2srv_negprot_send(req, io);
 }
+
+/*
+ * reply to a SMB negprot request with dialect "SMB 2.001"
+ */
+void smb2srv_reply_smb_negprot(struct smbsrv_request *smb_req)
+{
+	struct smb2srv_request *req;
+	uint32_t body_fixed_size = 0x26;
+
+	/* create a fake SMB2 negprot request */
+	req = talloc_zero(smb_req->smb_conn, struct smb2srv_request);
+	if (!req) goto nomem;
+	req->smb_conn		= smb_req->smb_conn;
+	req->request_time	= smb_req->request_time;
+	talloc_steal(req, smb_req);
+
+	req->in.size      = NBT_HDR_SIZE+SMB2_HDR_BODY+body_fixed_size;
+	req->in.allocated = req->in.size;
+	req->in.buffer    = talloc_size(req, req->in.allocated);
+	if (!req->in.buffer) goto nomem;
+	req->in.hdr       = req->in.buffer + NBT_HDR_SIZE;
+	req->in.body      = req->in.hdr + SMB2_HDR_BODY;
+	req->in.body_size = body_fixed_size;
+	req->in.dynamic   = NULL;
+
+	SIVAL(req->in.hdr, 0,                SMB2_MAGIC);
+	SSVAL(req->in.hdr, SMB2_HDR_LENGTH,  SMB2_HDR_BODY);
+	SSVAL(req->in.hdr, SMB2_HDR_PAD1,    0);
+	SIVAL(req->in.hdr, SMB2_HDR_STATUS,  0);
+	SSVAL(req->in.hdr, SMB2_HDR_OPCODE,  SMB2_OP_NEGPROT);
+	SSVAL(req->in.hdr, SMB2_HDR_PAD2,    0);
+	SIVAL(req->in.hdr, SMB2_HDR_FLAGS,   0);
+	SIVAL(req->in.hdr, SMB2_HDR_UNKNOWN, 0);
+	SBVAL(req->in.hdr, SMB2_HDR_SEQNUM,  0);
+	SIVAL(req->in.hdr, SMB2_HDR_PID,     0);
+	SIVAL(req->in.hdr, SMB2_HDR_TID,     0);
+	SBVAL(req->in.hdr, SMB2_HDR_UID,     0);
+	memset(req->in.hdr+SMB2_HDR_SIG, 0, 16);
+
+	/* this seems to be a bug, they use 0x24 but the length is 0x26 */
+	SSVAL(req->in.body, 0x00, 0x24);
+
+	SSVAL(req->in.body, 0x02, 1);
+	memset(req->in.body+0x04, 0, 32);
+	SSVAL(req->in.body, 0x24, 0);
+
+	smb2srv_negprot_recv(req);
+	return;
+nomem:
+	smbsrv_terminate_connection(smb_req->smb_conn, nt_errstr(NT_STATUS_NO_MEMORY));
+	talloc_free(req);
+	return;
+}
diff --git a/source4/smb_server/smb_server.c b/source4/smb_server/smb_server.c
index 6740db4923..6e517cd386 100644
--- a/source4/smb_server/smb_server.c
+++ b/source4/smb_server/smb_server.c
@@ -56,14 +56,14 @@ static NTSTATUS smbsrv_recv_generic_request(void *private, DATA_BLOB blob)
 		packet_set_callback(smb_conn->packet, smbsrv_recv_smb_request);
 		return smbsrv_recv_smb_request(smb_conn, blob);
 	case SMB2_MAGIC:
-		if (!lp_parm_bool(-1, "smbsrv", "enable smb2", False)) break;
+		if (lp_maxprotocol() < PROTOCOL_SMB2) break;
 		status = smbsrv_init_smb2_connection(smb_conn);
 		NT_STATUS_NOT_OK_RETURN(status);
 		packet_set_callback(smb_conn->packet, smbsrv_recv_smb2_request);
 		return smbsrv_recv_smb2_request(smb_conn, blob);
 	}
 
-	DEBUG(2,("Invalid SMB packet: protocl prefix: 0x%08X\n", protocol_version));
+	DEBUG(2,("Invalid SMB packet: protocol prefix: 0x%08X\n", protocol_version));
 	smbsrv_terminate_connection(smb_conn, "NON-SMB packet");
 	return NT_STATUS_OK;
 }