s3:smbd: implement SMB2 Read

This only works works on file shares.

metze

1 files changed, 207 insertions, 0 deletions

diff --git a/source3/smbd/smb2_read.c b/source3/smbd/smb2_read.c
new file mode 100644
index 0000000000..9db77dc2ef
--- /dev/null
+++ b/source3/smbd/smb2_read.c
@@ -0,0 +1,207 @@
+/*
+   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_read(struct smbd_smb2_request *req,
+			       uint32_t in_smbpid,
+			       uint64_t in_file_id_volatile,
+			       uint32_t in_length,
+			       uint64_t in_offset,
+			       uint32_t in_minimum,
+			       uint32_t in_remaining,
+			       DATA_BLOB *out_data_buffer,
+			       uint32_t *out_remaining);
+
+NTSTATUS smbd_smb2_request_process_read(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;
+	uint32_t in_length;
+	uint64_t in_offset;
+	uint64_t in_file_id_persistent;
+	uint64_t in_file_id_volatile;
+	uint32_t in_minimum_count;
+	uint32_t in_remaining_bytes;
+	uint8_t out_data_offset;
+	DATA_BLOB out_data_buffer;
+	uint32_t out_data_remaining;
+	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_length		= IVAL(inbody, 0x04);
+	in_offset		= BVAL(inbody, 0x08);
+	in_file_id_persistent	= BVAL(inbody, 0x10);
+	in_file_id_volatile	= BVAL(inbody, 0x18);
+	in_minimum_count	= IVAL(inbody, 0x20);
+	in_remaining_bytes	= IVAL(inbody, 0x28);
+
+	/* check the max read size */
+	if (in_length > 0x00010000) {
+		DEBUG(0,("here:%s: 0x%08X: 0x%08X\n",
+			__location__, in_length, 0x00010000));
+		return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
+	}
+
+	if (in_file_id_persistent != 0) {
+		return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
+	}
+
+	status = smbd_smb2_read(req,
+				in_smbpid,
+				in_file_id_volatile,
+				in_length,
+				in_offset,
+				in_minimum_count,
+				in_remaining_bytes,
+				&out_data_buffer,
+				&out_data_remaining);
+	if (!NT_STATUS_IS_OK(status)) {
+		return smbd_smb2_request_error(req, status);
+	}
+
+	out_data_offset = SMB2_HDR_BODY + 0x10;
+
+	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 */
+	SCVAL(outbody.data, 0x02,
+	      out_data_offset);			/* data offset */
+	SCVAL(outbody.data, 0x03, 0);		/* reserved */
+	SIVAL(outbody.data, 0x04,
+	      out_data_buffer.length);		/* data length */
+	SIVAL(outbody.data, 0x08,
+	      out_data_remaining);		/* data remaining */
+	SIVAL(outbody.data, 0x0C, 0);		/* reserved */
+
+	outdyn = out_data_buffer;
+
+	return smbd_smb2_request_done(req, outbody, &outdyn);
+}
+
+static NTSTATUS smbd_smb2_read(struct smbd_smb2_request *req,
+			       uint32_t in_smbpid,
+			       uint64_t in_file_id_volatile,
+			       uint32_t in_length,
+			       uint64_t in_offset,
+			       uint32_t in_minimum,
+			       uint32_t in_remaining,
+			       DATA_BLOB *out_data_buffer,
+			       uint32_t *out_remaining)
+{
+	struct smb_request *smbreq;
+	connection_struct *conn = req->tcon->compat_conn;
+	files_struct *fsp;
+	ssize_t nread = -1;
+	struct lock_struct lock;
+
+	DEBUG(10,("smbd_smb2_read: 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_READ(fsp, smbreq)) {
+		return NT_STATUS_ACCESS_DENIED;
+	}
+
+	*out_data_buffer = data_blob_talloc(req, NULL, in_length);
+	if (in_length > 0 && out_data_buffer->data == NULL) {
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	init_strict_lock_struct(fsp,
+				in_smbpid,
+				in_offset,
+				in_length,
+				READ_LOCK,
+				&lock);
+
+	if (!SMB_VFS_STRICT_LOCK(conn, fsp, &lock)) {
+		return NT_STATUS_FILE_LOCK_CONFLICT;
+	}
+
+	nread = read_file(fsp,
+			  (char *)out_data_buffer->data,
+			  in_offset,
+			  in_length);
+
+	SMB_VFS_STRICT_UNLOCK(conn, fsp, &lock);
+
+	if (nread < 0) {
+		DEBUG(5,("smbd_smb2_read: read_file[%s] nread[%lld]\n",
+			fsp->fsp_name, (long long)nread));
+		return NT_STATUS_ACCESS_DENIED;
+	}
+	if (nread == 0 && in_length != 0) {
+		DEBUG(5,("smbd_smb2_read: read_file[%s] end of file\n",
+			fsp->fsp_name));
+		return NT_STATUS_END_OF_FILE;
+	}
+
+	out_data_buffer->length = nread;
+	*out_remaining = 0;
+	return NT_STATUS_OK;
+}