s3:smbd: implement SMB2 Write

This only works on file shares.

metze

1 files changed, 213 insertions, 0 deletions

diff --git a/source3/smbd/smb2_write.c b/source3/smbd/smb2_write.c
new file mode 100644
index 00000000000..99a9c40ef4a
--- /dev/null
+++ b/source3/smbd/smb2_write.c
@@ -0,0 +1,213 @@
+/*
+   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"
+
+static NTSTATUS smbd_smb2_write(struct smbd_smb2_request *req,
+				uint32_t in_smbpid,
+				uint64_t in_file_id_volatile,
+				DATA_BLOB in_data,
+				uint64_t in_offset,
+				uint32_t in_flags,
+				uint32_t *out_count);
+
+NTSTATUS smbd_smb2_request_process_write(struct smbd_smb2_request *req)
+{
+	const uint8_t *inhdr;
+	const uint8_t *inbody;
+	int i = req->current_idx;
+	uint8_t *outhdr;
+	DATA_BLOB outbody;
+	DATA_BLOB outdyn;
+	size_t expected_body_size = 0x31;
+	size_t body_size;
+	uint32_t in_smbpid;
+	uint16_t in_data_offset;
+	uint32_t in_data_length;
+	DATA_BLOB in_data_buffer;
+	uint64_t in_offset;
+	uint64_t in_file_id_persistent;
+	uint64_t in_file_id_volatile;
+	uint32_t in_flags;
+	uint32_t out_count;
+	NTSTATUS status;
+
+	inhdr = (const uint8_t *)req->in.vector[i+0].iov_base;
+	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);
+	}
+
+	in_smbpid = IVAL(inhdr, SMB2_HDR_PID);
+
+	in_data_offset		= SVAL(inbody, 0x02);
+	in_data_length		= IVAL(inbody, 0x04);
+	in_offset		= BVAL(inbody, 0x08);
+	in_file_id_persistent	= BVAL(inbody, 0x10);
+	in_file_id_volatile	= BVAL(inbody, 0x18);
+	in_flags		= IVAL(inbody, 0x2C);
+
+	if (in_data_offset != (SMB2_HDR_BODY + (body_size & 0xFFFFFFFE))) {
+		return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
+	}
+
+	if (in_data_length > req->in.vector[i+2].iov_len) {
+		return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
+	}
+
+	/* check the max write size */
+	if (in_data_length > 0x00010000) {
+		DEBUG(0,("here:%s: 0x%08X: 0x%08X\n",
+			__location__, in_data_length, 0x00010000));
+		return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
+	}
+
+	in_data_buffer.data = (uint8_t *)req->in.vector[i+2].iov_base;
+	in_data_buffer.length = in_data_length;
+
+	if (in_file_id_persistent != 0) {
+		return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
+	}
+
+	status = smbd_smb2_write(req,
+				 in_smbpid,
+				 in_file_id_volatile,
+				 in_data_buffer,
+				 in_offset,
+				 in_flags,
+				 &out_count);
+	if (!NT_STATUS_IS_OK(status)) {
+		return smbd_smb2_request_error(req, status);
+	}
+
+	outhdr = (uint8_t *)req->out.vector[i].iov_base;
+
+	outbody = data_blob_talloc(req->out.vector, NULL, 0x10);
+	if (outbody.data == NULL) {
+		return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
+	}
+
+	SSVAL(outbody.data, 0x00, 0x10 + 1);	/* struct size */
+	SSVAL(outbody.data, 0x02, 0);		/* reserved */
+	SIVAL(outbody.data, 0x04, out_count);	/* count */
+	SIVAL(outbody.data, 0x08, 0);		/* remaining */
+	SSVAL(outbody.data, 0x0C, 0);		/* write channel info offset */
+	SSVAL(outbody.data, 0x0E, 0);		/* write channel info length */
+
+	outdyn = data_blob_const(NULL, 0);
+
+	return smbd_smb2_request_done(req, outbody, &outdyn);
+}
+
+static NTSTATUS smbd_smb2_write(struct smbd_smb2_request *req,
+				uint32_t in_smbpid,
+				uint64_t in_file_id_volatile,
+				DATA_BLOB in_data,
+				uint64_t in_offset,
+				uint32_t in_flags,
+				uint32_t *out_count)
+{
+	NTSTATUS status;
+	struct smb_request *smbreq;
+	connection_struct *conn = req->tcon->compat_conn;
+	files_struct *fsp;
+	ssize_t nwritten;
+	bool write_through = false;
+	struct lock_struct lock;
+
+	DEBUG(10,("smbd_smb2_write: file_id[0x%016llX]\n",
+		  (unsigned long long)in_file_id_volatile));
+
+	smbreq = smbd_smb2_fake_smb_request(req);
+	if (smbreq == NULL) {
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	/* If it's an IPC, pass off the pipe handler. */
+	if (IS_IPC(conn)) {
+		return NT_STATUS_NOT_IMPLEMENTED;
+	}
+
+	fsp = file_fsp(smbreq, (uint16_t)in_file_id_volatile);
+	if (fsp == NULL) {
+		return NT_STATUS_FILE_CLOSED;
+	}
+	if (conn != fsp->conn) {
+		return NT_STATUS_FILE_CLOSED;
+	}
+	if (req->session->vuid != fsp->vuid) {
+		return NT_STATUS_FILE_CLOSED;
+	}
+
+	if (!CHECK_WRITE(fsp)) {
+		return NT_STATUS_ACCESS_DENIED;
+	}
+
+	init_strict_lock_struct(fsp,
+				in_smbpid,
+				in_offset,
+				in_data.length,
+				WRITE_LOCK,
+				&lock);
+
+	if (!SMB_VFS_STRICT_LOCK(conn, fsp, &lock)) {
+		return NT_STATUS_FILE_LOCK_CONFLICT;
+	}
+
+	nwritten = write_file(smbreq, fsp,
+			      (const char *)in_data.data,
+			      in_offset,
+			      in_data.length);
+
+	if (((nwritten == 0) && (in_data.length != 0)) || (nwritten < 0)) {
+		DEBUG(5,("smbd_smb2_write: write_file[%s] disk full\n",
+			fsp->fsp_name));
+		SMB_VFS_STRICT_UNLOCK(conn, fsp, &lock);
+		return NT_STATUS_DISK_FULL;
+	}
+
+	DEBUG(3,("smbd_smb2_write: fnum=[%d/%s] length=%d offset=%d wrote=%d\n",
+		fsp->fnum, fsp->fsp_name, (int)in_data.length,
+		(int)in_offset, (int)nwritten));
+
+	if (in_flags & 0x00000001) {
+		write_through = true;
+	}
+
+	status = sync_file(conn, fsp, write_through);
+	if (!NT_STATUS_IS_OK(status)) {
+		DEBUG(5,("smbd_smb2_write: sync_file for %s returned %s\n",
+			fsp->fsp_name, nt_errstr(status)));
+		SMB_VFS_STRICT_UNLOCK(conn, fsp, &lock);
+		return status;
+	}
+
+	SMB_VFS_STRICT_UNLOCK(conn, fsp, &lock);
+
+	return NT_STATUS_OK;
+}