smb2: Move smb2cli session setup code to cli_smb_common.

2 files changed, 234 insertions, 0 deletions

diff --git a/libcli/smb/smb2_session.c b/libcli/smb/smb2_session.c
new file mode 100644
index 0000000000..b69f0a2a93
--- /dev/null
+++ b/libcli/smb/smb2_session.c
@@ -0,0 +1,233 @@
+/*
+   Unix SMB/CIFS implementation.
+   smb2 lib
+   Copyright (C) Volker Lendecke 2011
+
+   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 "system/network.h"
+#include "../lib/util/tevent_ntstatus.h"
+#include "../libcli/smb/smb_common.h"
+#include "../libcli/smb/smbXcli_base.h"
+
+struct smb2cli_session_setup_state {
+	struct smbXcli_session *session;
+	uint8_t fixed[24];
+	uint8_t dyn_pad[1];
+	struct iovec *recv_iov;
+	DATA_BLOB out_security_buffer;
+	NTSTATUS status;
+};
+
+static void smb2cli_session_setup_done(struct tevent_req *subreq);
+
+struct tevent_req *smb2cli_session_setup_send(TALLOC_CTX *mem_ctx,
+				struct tevent_context *ev,
+				struct smbXcli_conn *conn,
+				uint32_t timeout_msec,
+				struct smbXcli_session *session,
+				uint8_t in_flags,
+				uint32_t in_capabilities,
+				uint32_t in_channel,
+				uint64_t in_previous_session_id,
+				const DATA_BLOB *in_security_buffer)
+{
+	struct tevent_req *req, *subreq;
+	struct smb2cli_session_setup_state *state;
+	uint8_t *buf;
+	uint8_t *dyn;
+	size_t dyn_len;
+	uint8_t security_mode;
+	uint16_t security_buffer_offset = 0;
+	uint16_t security_buffer_length = 0;
+
+	req = tevent_req_create(mem_ctx, &state,
+				struct smb2cli_session_setup_state);
+	if (req == NULL) {
+		return NULL;
+	}
+
+	if (session == NULL) {
+		tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER_MIX);
+		return tevent_req_post(req, ev);
+	}
+	state->session = session;
+	security_mode = smb2cli_session_security_mode(session);
+
+	if (in_security_buffer) {
+		if (in_security_buffer->length > UINT16_MAX) {
+			tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER_MIX);
+			return tevent_req_post(req, ev);
+		}
+		security_buffer_offset = SMB2_HDR_BODY + 24;
+		security_buffer_length = in_security_buffer->length;
+	}
+
+	buf = state->fixed;
+
+	SSVAL(buf,  0, 25);
+	SCVAL(buf,  2, in_flags);
+	SCVAL(buf,  3, security_mode);
+	SIVAL(buf,  4, in_capabilities);
+	SIVAL(buf,  8, in_channel);
+	SSVAL(buf, 12, security_buffer_offset);
+	SSVAL(buf, 14, security_buffer_length);
+	SBVAL(buf, 16, in_previous_session_id);
+
+	if (security_buffer_length > 0) {
+		dyn = in_security_buffer->data;
+		dyn_len = in_security_buffer->length;
+	} else {
+		dyn = state->dyn_pad;;
+		dyn_len = sizeof(state->dyn_pad);
+	}
+
+	subreq = smb2cli_req_send(state, ev,
+				  conn, SMB2_OP_SESSSETUP,
+				  0, 0, /* flags */
+				  timeout_msec,
+				  0xFEFF,
+				  0, /* tid */
+				  session,
+				  state->fixed, sizeof(state->fixed),
+				  dyn, dyn_len);
+	if (tevent_req_nomem(subreq, req)) {
+		return tevent_req_post(req, ev);
+	}
+	tevent_req_set_callback(subreq, smb2cli_session_setup_done, req);
+	return req;
+}
+
+static void smb2cli_session_setup_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req =
+		tevent_req_callback_data(subreq,
+		struct tevent_req);
+	struct smb2cli_session_setup_state *state =
+		tevent_req_data(req,
+		struct smb2cli_session_setup_state);
+	NTSTATUS status;
+	uint64_t current_session_id;
+	uint64_t session_id;
+	uint16_t session_flags;
+	uint16_t expected_offset = 0;
+	uint16_t security_buffer_offset;
+	uint16_t security_buffer_length;
+	uint8_t *security_buffer_data = NULL;
+	const uint8_t *hdr;
+	const uint8_t *body;
+	static const struct smb2cli_req_expected_response expected[] = {
+	{
+		.status = NT_STATUS_MORE_PROCESSING_REQUIRED,
+		.body_size = 0x09
+	},
+	{
+		.status = NT_STATUS_OK,
+		.body_size = 0x09
+	}
+	};
+
+	status = smb2cli_req_recv(subreq, state, &state->recv_iov,
+				  expected, ARRAY_SIZE(expected));
+	TALLOC_FREE(subreq);
+	if (!NT_STATUS_IS_OK(status) &&
+	    !NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
+		tevent_req_nterror(req, status);
+		return;
+	}
+
+	hdr = (const uint8_t *)state->recv_iov[0].iov_base;
+	body = (const uint8_t *)state->recv_iov[1].iov_base;
+
+	session_id = BVAL(hdr, SMB2_HDR_SESSION_ID);
+	session_flags = SVAL(body, 2);
+
+	security_buffer_offset = SVAL(body, 4);
+	security_buffer_length = SVAL(body, 6);
+
+	if (security_buffer_length > 0) {
+		expected_offset = SMB2_HDR_BODY + 8;
+	}
+	if (security_buffer_offset != 0) {
+		security_buffer_data = (uint8_t *)state->recv_iov[2].iov_base;
+		expected_offset = SMB2_HDR_BODY + 8;
+	}
+
+	if (security_buffer_offset != expected_offset) {
+		tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
+		return;
+	}
+	if (security_buffer_length > state->recv_iov[2].iov_len) {
+		tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
+		return;
+	}
+
+	state->out_security_buffer.data = security_buffer_data;
+	state->out_security_buffer.length = security_buffer_length;
+
+	current_session_id = smb2cli_session_current_id(state->session);
+	if (current_session_id == 0) {
+		/* A new session was requested */
+		current_session_id = session_id;
+	}
+
+	if (current_session_id != session_id) {
+		tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
+		return;
+	}
+
+	smb2cli_session_set_id_and_flags(state->session,
+					 session_id, session_flags);
+
+	state->status = status;
+	tevent_req_done(req);
+}
+
+NTSTATUS smb2cli_session_setup_recv(struct tevent_req *req,
+				    TALLOC_CTX *mem_ctx,
+				    struct iovec **recv_iov,
+				    DATA_BLOB *out_security_buffer)
+{
+	struct smb2cli_session_setup_state *state =
+		tevent_req_data(req,
+		struct smb2cli_session_setup_state);
+	NTSTATUS status;
+	struct iovec *_tmp;
+
+	if (tevent_req_is_nterror(req, &status)) {
+		tevent_req_received(req);
+		return status;
+	}
+
+	if (recv_iov == NULL) {
+		recv_iov = &_tmp;
+	}
+
+	*recv_iov = talloc_move(mem_ctx, &state->recv_iov);
+
+	*out_security_buffer = state->out_security_buffer;
+
+	/*
+	 * Return the status from the server:
+	 * NT_STATUS_MORE_PROCESSING_REQUIRED or
+	 * NT_STATUS_OK.
+	 */
+	status = state->status;
+	tevent_req_received(req);
+	return status;
+}
+
+
diff --git a/libcli/smb/wscript_build b/libcli/smb/wscript_build
index 1d93d2fff4..7a21d4a4a7 100644
--- a/libcli/smb/wscript_build
+++ b/libcli/smb/wscript_build
@@ -5,6 +5,7 @@ bld.SAMBA_LIBRARY('cli_smb_common',
 	source='''
 		smb_signing.c smb_seal.c
 		smb2_create_blob.c smb2_signing.c
+		smb2_session.c
 		util.c read_smb.c
 		smbXcli_base.c
 		smb1cli_trans.c