s3:smbd: add support for SMB2 Negotiate

This is not complete, but a start that makes the
samba4 smb2 client happy.

metze

source3/Makefile.in

@@ -748,7 +748,7 @@ SMBD_OBJ_SRV = smbd/files.o smbd/chgpasswd.o smbd/connection.o \
 	       smbd/dmapi.o smbd/signing.o \
 	       smbd/file_access.o \
 	       smbd/dnsregister.o smbd/globals.o \
-	       smbd/smb2_server.o \
+	       smbd/smb2_server.o smbd/smb2_negprot.o \
 	       $(MANGLE_OBJ) @VFS_STATIC@
 
 SMBD_OBJ_BASE = $(PARAM_WITHOUT_REG_OBJ) $(SMBD_OBJ_SRV) $(LIBSMB_OBJ) \

source3/smbd/globals.h

@@ -216,6 +216,8 @@ NTSTATUS smbd_smb2_request_error(struct smbd_smb2_request *req,
 NTSTATUS smbd_smb2_request_done(struct smbd_smb2_request *req,
 				DATA_BLOB body, DATA_BLOB *dyn);
 
+NTSTATUS smbd_smb2_request_process_negprot(struct smbd_smb2_request *req);
+
 struct smbd_smb2_request {
 	TALLOC_CTX *mem_pool;
 

source3/smbd/smb2_negprot.c

@@ -0,0 +1,127 @@
+/*
+   Unix SMB/CIFS implementation.
+   Core SMB2 server
+
+   Copyright (C) Stefan Metzmacher 2009
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "includes.h"
+#include "smbd/globals.h"
+#include "../source4/libcli/smb2/smb2_constants.h"
+
+extern enum protocol_types Protocol;
+
+NTSTATUS smbd_smb2_request_process_negprot(struct smbd_smb2_request *req)
+{
+	const uint8_t *inbody;
+	const uint8_t *indyn = NULL;
+	int i = req->current_idx;
+	DATA_BLOB outbody;
+	DATA_BLOB outdyn;
+	DATA_BLOB negprot_spnego_blob;
+	uint16_t security_offset;
+	DATA_BLOB security_buffer;
+	size_t expected_body_size = 0x24;
+	size_t body_size;
+	size_t expected_dyn_size = 0;
+	size_t c;
+	uint16_t dialect_count;
+	uint16_t dialect;
+
+/* TODO: drop the connection with INVALI_PARAMETER */
+
+	if (req->in.vector[i+1].iov_len != (expected_body_size & 0xFFFFFFFE)) {
+		return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
+	}
+
+	inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
+
+	body_size = SVAL(inbody, 0x00);
+	if (body_size != expected_body_size) {
+		return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
+	}
+
+	dialect_count = SVAL(inbody, 0x02);
+	if (dialect_count == 0) {
+		return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
+	}
+
+	expected_dyn_size = dialect_count * 2;
+	if (req->in.vector[i+2].iov_len < expected_dyn_size) {
+		return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
+	}
+	indyn = (const uint8_t *)req->in.vector[i+2].iov_base;
+
+	for (c=0; c < dialect_count; c++) {
+		dialect = SVAL(indyn, c*2);
+		if (dialect == 0x0202) {
+			break;
+		}
+	}
+
+	if (dialect != 0x0202) {
+		return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
+	}
+
+	Protocol = PROTOCOL_SMB2;
+
+	if (get_remote_arch() != RA_SAMBA) {
+		set_remote_arch(RA_VISTA);
+	}
+
+	/* negprot_spnego() returns a the server guid in the first 16 bytes */
+	negprot_spnego_blob = negprot_spnego();
+	if (negprot_spnego_blob.data == NULL) {
+		return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
+	}
+	talloc_steal(req, negprot_spnego_blob.data);
+
+	if (negprot_spnego_blob.length < 16) {
+		return smbd_smb2_request_error(req, NT_STATUS_INTERNAL_ERROR);
+	}
+
+	security_offset = SMB2_HDR_BODY + 0x40;
+	security_buffer = data_blob_const(negprot_spnego_blob.data + 16,
+					  negprot_spnego_blob.length - 16);
+
+	outbody = data_blob_talloc(req->out.vector, NULL, 0x40);
+	if (outbody.data == NULL) {
+		return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
+	}
+
+	SSVAL(outbody.data, 0x00, 0x40 + 1);	/* struct size */
+/*TODO: indicate signing enabled */
+	SSVAL(outbody.data, 0x02, 0);		/* security mode */
+	SSVAL(outbody.data, 0x04, dialect);	/* dialect revision */
+	SSVAL(outbody.data, 0x06, 0);		/* reserved */
+	memcpy(outbody.data + 0x08,
+	       negprot_spnego_blob.data, 16);	/* server guid */
+	SIVAL(outbody.data, 0x18, 0);		/* capabilities */
+	SIVAL(outbody.data, 0x1C, 0x00010000);	/* max transact size */
+	SIVAL(outbody.data, 0x20, 0x00010000);	/* max read size */
+	SIVAL(outbody.data, 0x24, 0x00010000);	/* max write size */
+	SBVAL(outbody.data, 0x28, 0);		/* system time */
+	SBVAL(outbody.data, 0x30, 0);		/* server start time */
+	SSVAL(outbody.data, 0x38,
+	      security_offset);			/* security buffer offset */
+	SSVAL(outbody.data, 0x3A,
+	      security_buffer.length);		/* security buffer length */
+	SIVAL(outbody.data, 0x3C, 0);		/* reserved */
+
+	outdyn = security_buffer;
+
+	return smbd_smb2_request_done(req, outbody, &outdyn);
+}

source3/smbd/smb2_server.c

@@ -290,6 +290,8 @@ static NTSTATUS smbd_smb2_request_dispatch(struct smbd_smb2_request *req)
 	DEBUG(10,("smbd_smb2_request_dispatch: opcode[%u]\n", opcode));
 	switch (opcode) {
 	case SMB2_OP_NEGPROT:
+		return smbd_smb2_request_process_negprot(req);
+
 	case SMB2_OP_SESSSETUP:
 	case SMB2_OP_LOGOFF:
 	case SMB2_OP_TCON: