Adding upstream version 2:4.17.12+dfsg.upstream/2%4.17.12+dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1370 insertions, 0 deletions

diff --git a/source3/smbd/smb2_sesssetup.c b/source3/smbd/smb2_sesssetup.c
new file mode 100644
index 0000000..14b806b
--- /dev/null
+++ b/source3/smbd/smb2_sesssetup.c
@@ -0,0 +1,1370 @@
+/*
+   Unix SMB/CIFS implementation.
+   Core SMB2 server
+
+   Copyright (C) Stefan Metzmacher 2009
+   Copyright (C) Jeremy Allison 2010
+
+   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/smbd.h"
+#include "smbd/globals.h"
+#include "../libcli/smb/smb_common.h"
+#include "../auth/gensec/gensec.h"
+#include "auth.h"
+#include "../lib/tsocket/tsocket.h"
+#include "../libcli/security/security.h"
+#include "../lib/util/tevent_ntstatus.h"
+#include "source3/lib/substitute.h"
+
+#include "lib/crypto/gnutls_helpers.h"
+#include <gnutls/gnutls.h>
+#include <gnutls/crypto.h>
+
+#undef DBGC_CLASS
+#define DBGC_CLASS DBGC_SMB2
+
+static struct tevent_req *smbd_smb2_session_setup_wrap_send(TALLOC_CTX *mem_ctx,
+					struct tevent_context *ev,
+					struct smbd_smb2_request *smb2req,
+					uint64_t in_session_id,
+					uint8_t in_flags,
+					uint8_t in_security_mode,
+					uint64_t in_previous_session_id,
+					DATA_BLOB in_security_buffer);
+static NTSTATUS smbd_smb2_session_setup_wrap_recv(struct tevent_req *req,
+					uint16_t *out_session_flags,
+					TALLOC_CTX *mem_ctx,
+					DATA_BLOB *out_security_buffer,
+					uint64_t *out_session_id);
+
+static void smbd_smb2_request_sesssetup_done(struct tevent_req *subreq);
+
+NTSTATUS smbd_smb2_request_process_sesssetup(struct smbd_smb2_request *smb2req)
+{
+	const uint8_t *inhdr;
+	const uint8_t *inbody;
+	uint64_t in_session_id;
+	uint8_t in_flags;
+	uint8_t in_security_mode;
+	uint64_t in_previous_session_id;
+	uint16_t in_security_offset;
+	uint16_t in_security_length;
+	DATA_BLOB in_security_buffer;
+	NTSTATUS status;
+	struct tevent_req *subreq;
+
+	status = smbd_smb2_request_verify_sizes(smb2req, 0x19);
+	if (!NT_STATUS_IS_OK(status)) {
+		return smbd_smb2_request_error(smb2req, status);
+	}
+	inhdr = SMBD_SMB2_IN_HDR_PTR(smb2req);
+	inbody = SMBD_SMB2_IN_BODY_PTR(smb2req);
+
+	in_session_id = BVAL(inhdr, SMB2_HDR_SESSION_ID);
+
+	in_flags = CVAL(inbody, 0x02);
+	in_security_mode = CVAL(inbody, 0x03);
+	/* Capabilities = IVAL(inbody, 0x04) */
+	/* Channel = IVAL(inbody, 0x08) */
+	in_security_offset = SVAL(inbody, 0x0C);
+	in_security_length = SVAL(inbody, 0x0E);
+	in_previous_session_id = BVAL(inbody, 0x10);
+
+	if (in_security_offset != (SMB2_HDR_BODY + SMBD_SMB2_IN_BODY_LEN(smb2req))) {
+		return smbd_smb2_request_error(smb2req, NT_STATUS_INVALID_PARAMETER);
+	}
+
+	if (in_security_length > SMBD_SMB2_IN_DYN_LEN(smb2req)) {
+		return smbd_smb2_request_error(smb2req, NT_STATUS_INVALID_PARAMETER);
+	}
+
+	in_security_buffer.data = SMBD_SMB2_IN_DYN_PTR(smb2req);
+	in_security_buffer.length = in_security_length;
+
+	subreq = smbd_smb2_session_setup_wrap_send(smb2req,
+						   smb2req->sconn->ev_ctx,
+						   smb2req,
+						   in_session_id,
+						   in_flags,
+						   in_security_mode,
+						   in_previous_session_id,
+						   in_security_buffer);
+	if (subreq == NULL) {
+		return smbd_smb2_request_error(smb2req, NT_STATUS_NO_MEMORY);
+	}
+	tevent_req_set_callback(subreq, smbd_smb2_request_sesssetup_done, smb2req);
+
+	/*
+	 * Avoid sending a STATUS_PENDING message, which
+	 * matches a Windows Server and avoids problems with
+	 * MacOS clients.
+	 *
+	 * Even after 90 seconds a Windows Server doesn't return
+	 * STATUS_PENDING if using NTLMSSP against a non reachable
+	 * trusted domain.
+	 */
+	return smbd_smb2_request_pending_queue(smb2req, subreq, 0);
+}
+
+static void smbd_smb2_request_sesssetup_done(struct tevent_req *subreq)
+{
+	struct smbd_smb2_request *smb2req =
+		tevent_req_callback_data(subreq,
+		struct smbd_smb2_request);
+	uint8_t *outhdr;
+	DATA_BLOB outbody;
+	DATA_BLOB outdyn;
+	uint16_t out_session_flags = 0;
+	uint64_t out_session_id = 0;
+	uint16_t out_security_offset;
+	DATA_BLOB out_security_buffer = data_blob_null;
+	NTSTATUS status;
+	NTSTATUS error; /* transport error */
+
+	status = smbd_smb2_session_setup_wrap_recv(subreq,
+						   &out_session_flags,
+						   smb2req,
+						   &out_security_buffer,
+						   &out_session_id);
+	TALLOC_FREE(subreq);
+	if (!NT_STATUS_IS_OK(status) &&
+	    !NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
+		status = nt_status_squash(status);
+		error = smbd_smb2_request_error(smb2req, status);
+		if (!NT_STATUS_IS_OK(error)) {
+			smbd_server_connection_terminate(smb2req->xconn,
+							 nt_errstr(error));
+			return;
+		}
+		return;
+	}
+
+	out_security_offset = SMB2_HDR_BODY + 0x08;
+
+	outhdr = SMBD_SMB2_OUT_HDR_PTR(smb2req);
+
+	outbody = smbd_smb2_generate_outbody(smb2req, 0x08);
+	if (outbody.data == NULL) {
+		error = smbd_smb2_request_error(smb2req, NT_STATUS_NO_MEMORY);
+		if (!NT_STATUS_IS_OK(error)) {
+			smbd_server_connection_terminate(smb2req->xconn,
+							 nt_errstr(error));
+			return;
+		}
+		return;
+	}
+
+	SBVAL(outhdr, SMB2_HDR_SESSION_ID, out_session_id);
+
+	SSVAL(outbody.data, 0x00, 0x08 + 1);	/* struct size */
+	SSVAL(outbody.data, 0x02,
+	      out_session_flags);		/* session flags */
+	SSVAL(outbody.data, 0x04,
+	      out_security_offset);		/* security buffer offset */
+	SSVAL(outbody.data, 0x06,
+	      out_security_buffer.length);	/* security buffer length */
+
+	outdyn = out_security_buffer;
+
+	error = smbd_smb2_request_done_ex(smb2req, status, outbody, &outdyn,
+					   __location__);
+	if (!NT_STATUS_IS_OK(error)) {
+		smbd_server_connection_terminate(smb2req->xconn,
+						 nt_errstr(error));
+		return;
+	}
+}
+
+static NTSTATUS smbd_smb2_auth_generic_return(struct smbXsrv_session *session,
+					struct smbXsrv_session_auth0 **_auth,
+					struct smbd_smb2_request *smb2req,
+					uint8_t in_security_mode,
+					struct auth_session_info *session_info,
+					uint16_t *out_session_flags,
+					uint64_t *out_session_id)
+{
+	NTSTATUS status;
+	bool guest = false;
+	struct smbXsrv_session *x = session;
+	struct smbXsrv_session_auth0 *auth = *_auth;
+	struct smbXsrv_connection *xconn = smb2req->xconn;
+	size_t i;
+	struct smb2_signing_derivations derivations = {
+		.signing = NULL,
+	};
+	DATA_BLOB preauth_hash = data_blob_null;
+
+	*_auth = NULL;
+
+	if (xconn->protocol >= PROTOCOL_SMB3_11) {
+		struct smbXsrv_preauth *preauth;
+		gnutls_hash_hd_t hash_hnd;
+		int rc;
+
+		preauth = talloc_move(smb2req, &auth->preauth);
+
+		rc = gnutls_hash_init(&hash_hnd, GNUTLS_DIG_SHA512);
+		if (rc < 0) {
+			return gnutls_error_to_ntstatus(rc, NT_STATUS_HASH_NOT_SUPPORTED);
+		}
+		rc = gnutls_hash(hash_hnd,
+				 preauth->sha512_value,
+				 sizeof(preauth->sha512_value));
+		if (rc < 0) {
+			gnutls_hash_deinit(hash_hnd, NULL);
+			return NT_STATUS_ACCESS_DENIED;
+		}
+		for (i = 1; i < smb2req->in.vector_count; i++) {
+			rc = gnutls_hash(hash_hnd,
+					 smb2req->in.vector[i].iov_base,
+					 smb2req->in.vector[i].iov_len);
+			if (rc < 0) {
+				gnutls_hash_deinit(hash_hnd, NULL);
+				return NT_STATUS_ACCESS_DENIED;
+			}
+		}
+		gnutls_hash_deinit(hash_hnd, preauth->sha512_value);
+
+		preauth_hash = data_blob_const(preauth->sha512_value,
+				    sizeof(preauth->sha512_value));
+	}
+
+	smb2_signing_derivations_fill_const_stack(&derivations,
+						  xconn->protocol,
+						  preauth_hash);
+
+	if ((in_security_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) ||
+	    (xconn->smb2.server.security_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED))
+	{
+		x->global->signing_flags = SMBXSRV_SIGNING_REQUIRED;
+	}
+
+	if ((lp_server_smb_encrypt(-1) >= SMB_ENCRYPTION_DESIRED) &&
+	    (xconn->smb2.client.capabilities & SMB2_CAP_ENCRYPTION)) {
+		x->global->encryption_flags = SMBXSRV_ENCRYPTION_DESIRED;
+	}
+
+	if (lp_server_smb_encrypt(-1) == SMB_ENCRYPTION_REQUIRED) {
+		x->global->encryption_flags = SMBXSRV_ENCRYPTION_REQUIRED |
+			SMBXSRV_ENCRYPTION_DESIRED;
+	}
+
+	if (security_session_user_level(session_info, NULL) < SECURITY_USER) {
+		if (security_session_user_level(session_info, NULL) == SECURITY_GUEST) {
+			*out_session_flags |= SMB2_SESSION_FLAG_IS_GUEST;
+		}
+		/* force no signing */
+		x->global->signing_flags &= ~SMBXSRV_SIGNING_REQUIRED;
+		/* we map anonymous to guest internally */
+		guest = true;
+	}
+
+	if (guest && (x->global->encryption_flags & SMBXSRV_ENCRYPTION_REQUIRED)) {
+		DEBUG(1,("reject guest session as encryption is required\n"));
+		return NT_STATUS_ACCESS_DENIED;
+	}
+
+	if (xconn->smb2.server.cipher == 0) {
+		if (x->global->encryption_flags & SMBXSRV_ENCRYPTION_REQUIRED) {
+			DEBUG(1,("reject session with dialect[0x%04X] "
+				 "as encryption is required\n",
+				 xconn->smb2.server.dialect));
+			return NT_STATUS_ACCESS_DENIED;
+		}
+	}
+	x->global->signing_algo = xconn->smb2.server.sign_algo;
+	x->global->encryption_cipher = xconn->smb2.server.cipher;
+	if (guest) {
+		x->global->encryption_cipher = SMB2_ENCRYPTION_NONE;
+	}
+
+	if (x->global->encryption_flags & SMBXSRV_ENCRYPTION_DESIRED) {
+		*out_session_flags |= SMB2_SESSION_FLAG_ENCRYPT_DATA;
+	}
+
+	status = smb2_signing_key_sign_create(x->global,
+					      x->global->signing_algo,
+					      &session_info->session_key,
+					      derivations.signing,
+					      &x->global->signing_key);
+	if (!NT_STATUS_IS_OK(status)) {
+		return status;
+	}
+	x->global->signing_key_blob = x->global->signing_key->blob;
+
+	if (x->global->encryption_cipher != SMB2_ENCRYPTION_NONE) {
+		size_t nonce_size;
+
+		status = smb2_signing_key_cipher_create(x->global,
+							x->global->encryption_cipher,
+							&session_info->session_key,
+							derivations.cipher_s2c,
+							&x->global->encryption_key);
+		if (!NT_STATUS_IS_OK(status)) {
+			return status;
+		}
+		x->global->encryption_key_blob = x->global->encryption_key->blob;
+
+		status = smb2_signing_key_cipher_create(x->global,
+							x->global->encryption_cipher,
+							&session_info->session_key,
+							derivations.cipher_c2s,
+							&x->global->decryption_key);
+		if (!NT_STATUS_IS_OK(status)) {
+			return status;
+		}
+		x->global->decryption_key_blob = x->global->decryption_key->blob;
+
+		/*
+		 * CCM and GCM algorithms must never have their
+		 * nonce wrap, or the security of the whole
+		 * communication and the keys is destroyed.
+		 * We must drop the connection once we have
+		 * transfered too much data.
+		 *
+		 * NOTE: We assume nonces greater than 8 bytes.
+		 */
+		generate_nonce_buffer((uint8_t *)&x->nonce_high_random,
+				      sizeof(x->nonce_high_random));
+		switch (xconn->smb2.server.cipher) {
+		case SMB2_ENCRYPTION_AES128_CCM:
+			nonce_size = SMB2_AES_128_CCM_NONCE_SIZE;
+			break;
+		case SMB2_ENCRYPTION_AES128_GCM:
+			nonce_size = gnutls_cipher_get_iv_size(GNUTLS_CIPHER_AES_128_GCM);
+			break;
+		case SMB2_ENCRYPTION_AES256_CCM:
+			nonce_size = SMB2_AES_128_CCM_NONCE_SIZE;
+			break;
+		case SMB2_ENCRYPTION_AES256_GCM:
+			nonce_size = gnutls_cipher_get_iv_size(GNUTLS_CIPHER_AES_256_GCM);
+			break;
+		default:
+			nonce_size = 0;
+			break;
+		}
+		x->nonce_high_max = SMB2_NONCE_HIGH_MAX(nonce_size);
+		x->nonce_high = 0;
+		x->nonce_low = 0;
+	}
+
+	status = smb2_signing_key_sign_create(x->global,
+					      x->global->signing_algo,
+					      &session_info->session_key,
+					      derivations.application,
+					      &x->global->application_key);
+	if (!NT_STATUS_IS_OK(status)) {
+		return status;
+	}
+	x->global->application_key_blob = x->global->application_key->blob;
+
+	if (xconn->protocol >= PROTOCOL_SMB3_00 && lp_debug_encryption()) {
+		DEBUG(0, ("debug encryption: dumping generated session keys\n"));
+		DEBUGADD(0, ("Session Id    "));
+		dump_data(0, (uint8_t*)&session->global->session_wire_id,
+			  sizeof(session->global->session_wire_id));
+		DEBUGADD(0, ("Session Key   "));
+		dump_data(0, session_info->session_key.data,
+			  session_info->session_key.length);
+		DEBUGADD(0, ("Signing Algo: %u\n", x->global->signing_algo));
+		DEBUGADD(0, ("Signing Key   "));
+		dump_data(0, x->global->signing_key_blob.data,
+			  x->global->signing_key_blob.length);
+		DEBUGADD(0, ("App Key       "));
+		dump_data(0, x->global->application_key_blob.data,
+			  x->global->application_key_blob.length);
+
+		/* In server code, ServerIn is the decryption key */
+
+		DEBUGADD(0, ("Cipher Algo: %u\n", x->global->encryption_cipher));
+		DEBUGADD(0, ("ServerIn Key  "));
+		dump_data(0, x->global->decryption_key_blob.data,
+			  x->global->decryption_key_blob.length);
+		DEBUGADD(0, ("ServerOut Key "));
+		dump_data(0, x->global->encryption_key_blob.data,
+			  x->global->encryption_key_blob.length);
+	}
+
+	status = smb2_signing_key_copy(x->global->channels,
+				       x->global->signing_key,
+				       &x->global->channels[0].signing_key);
+	if (!NT_STATUS_IS_OK(status)) {
+		return status;
+	}
+	x->global->channels[0].signing_key_blob =
+		x->global->channels[0].signing_key->blob;
+	x->global->channels[0].signing_algo = x->global->signing_algo;
+	x->global->channels[0].encryption_cipher = x->global->encryption_cipher;
+
+	data_blob_clear_free(&session_info->session_key);
+	session_info->session_key = data_blob_dup_talloc(session_info,
+						x->global->application_key_blob);
+	if (session_info->session_key.data == NULL) {
+		return NT_STATUS_NO_MEMORY;
+	}
+	talloc_keep_secret(session_info->session_key.data);
+
+	smb2req->sconn->num_users++;
+
+	if (security_session_user_level(session_info, NULL) >= SECURITY_USER) {
+		session->homes_snum =
+			register_homes_share(session_info->unix_info->unix_name);
+	}
+
+	set_current_user_info(session_info->unix_info->sanitized_username,
+			      session_info->unix_info->unix_name,
+			      session_info->info->domain_name);
+
+	reload_services(smb2req->sconn, conn_snum_used, true);
+
+	session->status = NT_STATUS_OK;
+	session->global->auth_session_info = talloc_move(session->global,
+							 &session_info);
+	session->global->auth_session_info_seqnum += 1;
+	for (i=0; i < session->global->num_channels; i++) {
+		struct smbXsrv_channel_global0 *_c =
+			&session->global->channels[i];
+
+		_c->auth_session_info_seqnum =
+			session->global->auth_session_info_seqnum;
+	}
+	session->global->auth_time = timeval_to_nttime(&smb2req->request_time);
+	session->global->expiration_time = gensec_expire_time(auth->gensec);
+
+	if (!session_claim(session)) {
+		DEBUG(1, ("smb2: Failed to claim session "
+			"for vuid=%llu\n",
+			(unsigned long long)session->global->session_wire_id));
+		return NT_STATUS_LOGON_FAILURE;
+	}
+
+	TALLOC_FREE(auth);
+	status = smbXsrv_session_update(session);
+	if (!NT_STATUS_IS_OK(status)) {
+		DEBUG(0, ("smb2: Failed to update session for vuid=%llu - %s\n",
+			  (unsigned long long)session->global->session_wire_id,
+			  nt_errstr(status)));
+		return NT_STATUS_LOGON_FAILURE;
+	}
+
+	/*
+	 * we attach the session to the request
+	 * so that the response can be signed
+	 */
+	if (!guest) {
+		smb2req->do_signing = true;
+	}
+
+	global_client_caps |= (CAP_LEVEL_II_OPLOCKS|CAP_STATUS32);
+
+	*out_session_id = session->global->session_wire_id;
+	smb2req->last_session_id = session->global->session_wire_id;
+
+	return NT_STATUS_OK;
+}
+
+static NTSTATUS smbd_smb2_reauth_generic_return(struct smbXsrv_session *session,
+					struct smbXsrv_session_auth0 **_auth,
+					struct smbd_smb2_request *smb2req,
+					struct auth_session_info *session_info,
+					uint16_t *out_session_flags,
+					uint64_t *out_session_id)
+{
+	NTSTATUS status;
+	struct smbXsrv_session *x = session;
+	struct smbXsrv_session_auth0 *auth = *_auth;
+	struct smbXsrv_connection *xconn = smb2req->xconn;
+	size_t i;
+
+	*_auth = NULL;
+
+	data_blob_clear_free(&session_info->session_key);
+	session_info->session_key = data_blob_dup_talloc(session_info,
+						x->global->application_key_blob);
+	if (session_info->session_key.data == NULL) {
+		return NT_STATUS_NO_MEMORY;
+	}
+	talloc_keep_secret(session_info->session_key.data);
+
+	session->homes_snum =
+			register_homes_share(session_info->unix_info->unix_name);
+
+	set_current_user_info(session_info->unix_info->sanitized_username,
+			      session_info->unix_info->unix_name,
+			      session_info->info->domain_name);
+
+	reload_services(smb2req->sconn, conn_snum_used, true);
+
+	if (security_session_user_level(session_info, NULL) >= SECURITY_USER) {
+		smb2req->do_signing = true;
+	}
+
+	session->status = NT_STATUS_OK;
+	TALLOC_FREE(session->global->auth_session_info);
+	session->global->auth_session_info = talloc_move(session->global,
+							 &session_info);
+	session->global->auth_session_info_seqnum += 1;
+	for (i=0; i < session->global->num_channels; i++) {
+		struct smbXsrv_channel_global0 *_c =
+			&session->global->channels[i];
+
+		_c->auth_session_info_seqnum =
+			session->global->auth_session_info_seqnum;
+	}
+	session->global->auth_time = timeval_to_nttime(&smb2req->request_time);
+	session->global->expiration_time = gensec_expire_time(auth->gensec);
+
+	TALLOC_FREE(auth);
+	status = smbXsrv_session_update(session);
+	if (!NT_STATUS_IS_OK(status)) {
+		DEBUG(0, ("smb2: Failed to update session for vuid=%llu - %s\n",
+			  (unsigned long long)session->global->session_wire_id,
+			  nt_errstr(status)));
+		return NT_STATUS_LOGON_FAILURE;
+	}
+
+	conn_clear_vuid_caches(xconn->client->sconn,
+			       session->global->session_wire_id);
+
+	*out_session_id = session->global->session_wire_id;
+
+	return NT_STATUS_OK;
+}
+
+static NTSTATUS smbd_smb2_bind_auth_return(struct smbXsrv_session *session,
+					   struct smbXsrv_session_auth0 **_auth,
+					   struct smbd_smb2_request *smb2req,
+					   struct auth_session_info *session_info,
+					   uint16_t *out_session_flags,
+					   uint64_t *out_session_id)
+{
+	NTSTATUS status;
+	struct smbXsrv_session *x = session;
+	struct smbXsrv_session_auth0 *auth = *_auth;
+	struct smbXsrv_connection *xconn = smb2req->xconn;
+	struct smbXsrv_channel_global0 *c = NULL;
+	size_t i;
+	struct smb2_signing_derivations derivations = {
+		.signing = NULL,
+	};
+	DATA_BLOB preauth_hash = data_blob_null;
+	bool ok;
+
+	*_auth = NULL;
+
+	if (xconn->protocol >= PROTOCOL_SMB3_11) {
+		struct smbXsrv_preauth *preauth;
+		gnutls_hash_hd_t hash_hnd = NULL;
+		int rc;
+
+		preauth = talloc_move(smb2req, &auth->preauth);
+
+		rc = gnutls_hash_init(&hash_hnd, GNUTLS_DIG_SHA512);
+		if (rc < 0) {
+			return gnutls_error_to_ntstatus(rc, NT_STATUS_HASH_NOT_SUPPORTED);
+		}
+
+		rc = gnutls_hash(hash_hnd,
+				 preauth->sha512_value,
+				 sizeof(preauth->sha512_value));
+		if (rc < 0) {
+			gnutls_hash_deinit(hash_hnd, NULL);
+			return gnutls_error_to_ntstatus(rc, NT_STATUS_HASH_NOT_SUPPORTED);
+		}
+		for (i = 1; i < smb2req->in.vector_count; i++) {
+			rc = gnutls_hash(hash_hnd,
+					 smb2req->in.vector[i].iov_base,
+					 smb2req->in.vector[i].iov_len);
+			if (rc < 0) {
+				gnutls_hash_deinit(hash_hnd, NULL);
+				return gnutls_error_to_ntstatus(rc, NT_STATUS_HASH_NOT_SUPPORTED);
+			}
+		}
+		gnutls_hash_deinit(hash_hnd, preauth->sha512_value);
+
+		preauth_hash = data_blob_const(preauth->sha512_value,
+				    sizeof(preauth->sha512_value));
+	}
+
+	smb2_signing_derivations_fill_const_stack(&derivations,
+						  xconn->protocol,
+						  preauth_hash);
+
+	status = smbXsrv_session_find_channel(session, xconn, &c);
+	if (!NT_STATUS_IS_OK(status)) {
+		return status;
+	}
+
+	ok = security_token_is_sid(session_info->security_token,
+			&x->global->auth_session_info->security_token->sids[0]);
+	if (!ok) {
+		return NT_STATUS_ACCESS_DENIED;
+	}
+
+	if (session_info->session_key.length == 0) {
+		/* See [MS-SMB2] 3.3.5.2.4 for the return code. */
+		return NT_STATUS_NOT_SUPPORTED;
+	}
+
+	c->signing_algo = xconn->smb2.server.sign_algo;
+	c->encryption_cipher = xconn->smb2.server.cipher;
+
+	status = smb2_signing_key_sign_create(x->global->channels,
+					      c->signing_algo,
+					      &session_info->session_key,
+					      derivations.signing,
+					      &c->signing_key);
+	if (!NT_STATUS_IS_OK(status)) {
+		return status;
+	}
+	c->signing_key_blob = c->signing_key->blob;
+
+	TALLOC_FREE(auth);
+	status = smbXsrv_session_update(session);
+	if (!NT_STATUS_IS_OK(status)) {
+		DEBUG(0, ("smb2: Failed to update session for vuid=%llu - %s\n",
+			  (unsigned long long)session->global->session_wire_id,
+			  nt_errstr(status)));
+		return NT_STATUS_LOGON_FAILURE;
+	}
+
+	*out_session_id = session->global->session_wire_id;
+
+	return NT_STATUS_OK;
+}
+
+struct smbd_smb2_session_setup_state {
+	struct tevent_context *ev;
+	struct smbd_smb2_request *smb2req;
+	uint64_t in_session_id;
+	uint8_t in_flags;
+	uint8_t in_security_mode;
+	uint64_t in_previous_session_id;
+	DATA_BLOB in_security_buffer;
+	struct smbXsrv_session *session;
+	struct smbXsrv_session_auth0 *auth;
+	struct auth_session_info *session_info;
+	uint16_t out_session_flags;
+	DATA_BLOB out_security_buffer;
+	uint64_t out_session_id;
+};
+
+static void smbd_smb2_session_setup_gensec_done(struct tevent_req *subreq);
+static void smbd_smb2_session_setup_previous_done(struct tevent_req *subreq);
+static void smbd_smb2_session_setup_auth_return(struct tevent_req *req);
+
+static struct tevent_req *smbd_smb2_session_setup_send(TALLOC_CTX *mem_ctx,
+					struct tevent_context *ev,
+					struct smbd_smb2_request *smb2req,
+					uint64_t in_session_id,
+					uint8_t in_flags,
+					uint8_t in_security_mode,
+					uint64_t in_previous_session_id,
+					DATA_BLOB in_security_buffer)
+{
+	struct tevent_req *req;
+	struct smbd_smb2_session_setup_state *state;
+	NTSTATUS status;
+	NTTIME now = timeval_to_nttime(&smb2req->request_time);
+	struct tevent_req *subreq;
+	struct smbXsrv_channel_global0 *c = NULL;
+	enum security_user_level seclvl;
+
+	req = tevent_req_create(mem_ctx, &state,
+				struct smbd_smb2_session_setup_state);
+	if (req == NULL) {
+		return NULL;
+	}
+	state->ev = ev;
+	state->smb2req = smb2req;
+	state->in_session_id = in_session_id;
+	state->in_flags = in_flags;
+	state->in_security_mode = in_security_mode;
+	state->in_previous_session_id = in_previous_session_id;
+	state->in_security_buffer = in_security_buffer;
+
+	if (in_flags & SMB2_SESSION_FLAG_BINDING) {
+		if (in_session_id == 0) {
+			tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
+			return tevent_req_post(req, ev);
+		}
+
+		if (smb2req->session == NULL) {
+			tevent_req_nterror(req, NT_STATUS_USER_SESSION_DELETED);
+			return tevent_req_post(req, ev);
+		}
+
+		if ((smb2req->session->global->signing_algo >= SMB2_SIGNING_AES128_GMAC) &&
+		    (smb2req->xconn->smb2.server.sign_algo != smb2req->session->global->signing_algo))
+		{
+			tevent_req_nterror(req, NT_STATUS_REQUEST_OUT_OF_SEQUENCE);
+			return tevent_req_post(req, ev);
+		}
+		if ((smb2req->xconn->smb2.server.sign_algo >= SMB2_SIGNING_AES128_GMAC) &&
+		    (smb2req->session->global->signing_algo != smb2req->xconn->smb2.server.sign_algo))
+		{
+			tevent_req_nterror(req, NT_STATUS_NOT_SUPPORTED);
+			return tevent_req_post(req, ev);
+		}
+
+		if (smb2req->xconn->protocol < PROTOCOL_SMB3_00) {
+			tevent_req_nterror(req, NT_STATUS_REQUEST_NOT_ACCEPTED);
+			return tevent_req_post(req, ev);
+		}
+
+		if (!smb2req->xconn->client->server_multi_channel_enabled) {
+			tevent_req_nterror(req, NT_STATUS_REQUEST_NOT_ACCEPTED);
+			return tevent_req_post(req, ev);
+		}
+
+		if (!smb2req->do_signing) {
+			tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
+			return tevent_req_post(req, ev);
+		}
+
+		if (smb2req->session->global->connection_dialect
+		    != smb2req->xconn->smb2.server.dialect)
+		{
+			tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
+			return tevent_req_post(req, ev);
+		}
+
+		if (smb2req->session->global->encryption_cipher
+		    != smb2req->xconn->smb2.server.cipher)
+		{
+			tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
+			return tevent_req_post(req, ev);
+		}
+
+		status = smb2req->session->status;
+		if (NT_STATUS_EQUAL(status, NT_STATUS_BAD_LOGON_SESSION_STATE)) {
+			/*
+			 * This comes from smb2srv_session_lookup_global().
+			 */
+			tevent_req_nterror(req, NT_STATUS_USER_SESSION_DELETED);
+			return tevent_req_post(req, ev);
+		}
+
+		status = smbXsrv_session_find_channel(smb2req->session,
+						      smb2req->xconn,
+						      &c);
+		if (NT_STATUS_IS_OK(status)) {
+			if (!smb2_signing_key_valid(c->signing_key)) {
+				goto auth;
+			}
+			tevent_req_nterror(req, NT_STATUS_REQUEST_NOT_ACCEPTED);
+			return tevent_req_post(req, ev);
+		}
+
+		seclvl = security_session_user_level(
+				smb2req->session->global->auth_session_info,
+				NULL);
+		if (seclvl < SECURITY_USER) {
+			tevent_req_nterror(req, NT_STATUS_NOT_SUPPORTED);
+			return tevent_req_post(req, ev);
+		}
+
+		status = smbXsrv_session_add_channel(smb2req->session,
+						     smb2req->xconn,
+						     now,
+						     &c);
+		if (!NT_STATUS_IS_OK(status)) {
+			tevent_req_nterror(req, status);
+			return tevent_req_post(req, ev);
+		}
+
+		status = smbXsrv_session_update(smb2req->session);
+		if (!NT_STATUS_IS_OK(status)) {
+			tevent_req_nterror(req, status);
+			return tevent_req_post(req, ev);
+		}
+	}
+
+auth:
+
+	if (state->in_session_id == 0) {
+		/* create a new session */
+		status = smbXsrv_session_create(state->smb2req->xconn,
+					        now, &state->session);
+		if (tevent_req_nterror(req, status)) {
+			return tevent_req_post(req, ev);
+		}
+		smb2req->session = state->session;
+	} else {
+		if (smb2req->session == NULL) {
+			tevent_req_nterror(req, NT_STATUS_USER_SESSION_DELETED);
+			return tevent_req_post(req, ev);
+		}
+
+		state->session = smb2req->session;
+		status = state->session->status;
+		if (NT_STATUS_EQUAL(status, NT_STATUS_BAD_LOGON_SESSION_STATE)) {
+			/*
+			 * This comes from smb2srv_session_lookup_global().
+			 */
+			tevent_req_nterror(req, NT_STATUS_USER_SESSION_DELETED);
+			return tevent_req_post(req, ev);
+		}
+		if (NT_STATUS_EQUAL(status, NT_STATUS_NETWORK_SESSION_EXPIRED)) {
+			status = NT_STATUS_OK;
+		}
+		if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
+			status = NT_STATUS_OK;
+		}
+		if (tevent_req_nterror(req, status)) {
+			return tevent_req_post(req, ev);
+		}
+	}
+
+	status = smbXsrv_session_find_channel(smb2req->session,
+					      smb2req->xconn, &c);
+	if (!NT_STATUS_IS_OK(status)) {
+		tevent_req_nterror(req, status);
+		return tevent_req_post(req, ev);
+	}
+
+	if (!(in_flags & SMB2_SESSION_FLAG_BINDING)) {
+		state->session->status = NT_STATUS_MORE_PROCESSING_REQUIRED;
+	}
+
+	status = smbXsrv_session_find_auth(state->session, smb2req->xconn,
+					   now, &state->auth);
+	if (!NT_STATUS_IS_OK(status)) {
+		status = smbXsrv_session_create_auth(state->session,
+						     smb2req->xconn, now,
+						     in_flags, in_security_mode,
+						     &state->auth);
+		if (tevent_req_nterror(req, status)) {
+			return tevent_req_post(req, ev);
+		}
+	}
+
+	if (state->auth->gensec == NULL) {
+		status = auth_generic_prepare(state->auth,
+					      state->smb2req->xconn->remote_address,
+					      state->smb2req->xconn->local_address,
+					      "SMB2",
+					      &state->auth->gensec);
+		if (tevent_req_nterror(req, status)) {
+			return tevent_req_post(req, ev);
+		}
+
+		gensec_want_feature(state->auth->gensec, GENSEC_FEATURE_SESSION_KEY);
+		gensec_want_feature(state->auth->gensec, GENSEC_FEATURE_UNIX_TOKEN);
+		gensec_want_feature(state->auth->gensec, GENSEC_FEATURE_SMB_TRANSPORT);
+
+		status = gensec_start_mech_by_oid(state->auth->gensec,
+						  GENSEC_OID_SPNEGO);
+		if (tevent_req_nterror(req, status)) {
+			return tevent_req_post(req, ev);
+		}
+	}
+
+	status = smbXsrv_session_update(state->session);
+	if (tevent_req_nterror(req, status)) {
+		return tevent_req_post(req, ev);
+	}
+
+	become_root();
+	subreq = gensec_update_send(state, state->ev,
+				    state->auth->gensec,
+				    state->in_security_buffer);
+	unbecome_root();
+	if (tevent_req_nomem(subreq, req)) {
+		return tevent_req_post(req, ev);
+	}
+	tevent_req_set_callback(subreq, smbd_smb2_session_setup_gensec_done, req);
+
+	return req;
+}
+
+static void smbd_smb2_session_setup_gensec_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req =
+		tevent_req_callback_data(subreq,
+		struct tevent_req);
+	struct smbd_smb2_session_setup_state *state =
+		tevent_req_data(req,
+		struct smbd_smb2_session_setup_state);
+	NTSTATUS status;
+
+	become_root();
+	status = gensec_update_recv(subreq, state,
+				    &state->out_security_buffer);
+	unbecome_root();
+	TALLOC_FREE(subreq);
+	if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED) &&
+	    !NT_STATUS_IS_OK(status)) {
+		tevent_req_nterror(req, status);
+		return;
+	}
+
+	if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
+		state->out_session_id = state->session->global->session_wire_id;
+		state->smb2req->preauth = state->auth->preauth;
+		tevent_req_nterror(req, status);
+		return;
+	}
+
+	status = gensec_session_info(state->auth->gensec,
+				     state,
+				     &state->session_info);
+	if (tevent_req_nterror(req, status)) {
+		return;
+	}
+
+	if ((state->in_previous_session_id != 0) &&
+	     (state->session->global->session_wire_id !=
+	      state->in_previous_session_id))
+	{
+		subreq = smb2srv_session_close_previous_send(state, state->ev,
+						state->smb2req->xconn,
+						state->session_info,
+						state->in_previous_session_id,
+						state->session->global->session_wire_id);
+		if (tevent_req_nomem(subreq, req)) {
+			return;
+		}
+		tevent_req_set_callback(subreq,
+					smbd_smb2_session_setup_previous_done,
+					req);
+		return;
+	}
+
+	smbd_smb2_session_setup_auth_return(req);
+}
+
+static void smbd_smb2_session_setup_previous_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req =
+		tevent_req_callback_data(subreq,
+		struct tevent_req);
+	NTSTATUS status;
+
+	status = smb2srv_session_close_previous_recv(subreq);
+	TALLOC_FREE(subreq);
+	if (tevent_req_nterror(req, status)) {
+		return;
+	}
+
+	smbd_smb2_session_setup_auth_return(req);
+}
+
+static void smbd_smb2_session_setup_auth_return(struct tevent_req *req)
+{
+	struct smbd_smb2_session_setup_state *state =
+		tevent_req_data(req,
+		struct smbd_smb2_session_setup_state);
+	NTSTATUS status;
+
+	if (state->in_flags & SMB2_SESSION_FLAG_BINDING) {
+		status = smbd_smb2_bind_auth_return(state->session,
+						    &state->auth,
+						    state->smb2req,
+						    state->session_info,
+						    &state->out_session_flags,
+						    &state->out_session_id);
+		if (tevent_req_nterror(req, status)) {
+			return;
+		}
+		tevent_req_done(req);
+		return;
+	}
+
+	if (state->session->global->auth_session_info != NULL) {
+		status = smbd_smb2_reauth_generic_return(state->session,
+							 &state->auth,
+							 state->smb2req,
+							 state->session_info,
+							 &state->out_session_flags,
+							 &state->out_session_id);
+		if (tevent_req_nterror(req, status)) {
+			return;
+		}
+		tevent_req_done(req);
+		return;
+	}
+
+	status = smbd_smb2_auth_generic_return(state->session,
+					       &state->auth,
+					       state->smb2req,
+					       state->in_security_mode,
+					       state->session_info,
+					       &state->out_session_flags,
+					       &state->out_session_id);
+	if (tevent_req_nterror(req, status)) {
+		return;
+	}
+
+	tevent_req_done(req);
+	return;
+}
+
+static NTSTATUS smbd_smb2_session_setup_recv(struct tevent_req *req,
+					uint16_t *out_session_flags,
+					TALLOC_CTX *mem_ctx,
+					DATA_BLOB *out_security_buffer,
+					uint64_t *out_session_id)
+{
+	struct smbd_smb2_session_setup_state *state =
+		tevent_req_data(req,
+		struct smbd_smb2_session_setup_state);
+	NTSTATUS status;
+
+	if (tevent_req_is_nterror(req, &status)) {
+		if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
+			tevent_req_received(req);
+			return nt_status_squash(status);
+		}
+	} else {
+		status = NT_STATUS_OK;
+	}
+
+	*out_session_flags = state->out_session_flags;
+	*out_security_buffer = state->out_security_buffer;
+	*out_session_id = state->out_session_id;
+
+	talloc_steal(mem_ctx, out_security_buffer->data);
+	tevent_req_received(req);
+	return status;
+}
+
+struct smbd_smb2_session_setup_wrap_state {
+	struct tevent_context *ev;
+	struct smbd_smb2_request *smb2req;
+	uint64_t in_session_id;
+	uint8_t in_flags;
+	uint8_t in_security_mode;
+	uint64_t in_previous_session_id;
+	DATA_BLOB in_security_buffer;
+	uint16_t out_session_flags;
+	DATA_BLOB out_security_buffer;
+	uint64_t out_session_id;
+	NTSTATUS error;
+};
+
+static void smbd_smb2_session_setup_wrap_setup_done(struct tevent_req *subreq);
+static void smbd_smb2_session_setup_wrap_shutdown_done(struct tevent_req *subreq);
+
+static struct tevent_req *smbd_smb2_session_setup_wrap_send(TALLOC_CTX *mem_ctx,
+					struct tevent_context *ev,
+					struct smbd_smb2_request *smb2req,
+					uint64_t in_session_id,
+					uint8_t in_flags,
+					uint8_t in_security_mode,
+					uint64_t in_previous_session_id,
+					DATA_BLOB in_security_buffer)
+{
+	struct tevent_req *req;
+	struct smbd_smb2_session_setup_wrap_state *state;
+	struct tevent_req *subreq;
+
+	req = tevent_req_create(mem_ctx, &state,
+				struct smbd_smb2_session_setup_wrap_state);
+	if (req == NULL) {
+		return NULL;
+	}
+	state->ev = ev;
+	state->smb2req = smb2req;
+	state->in_session_id = in_session_id;
+	state->in_flags = in_flags;
+	state->in_security_mode = in_security_mode;
+	state->in_previous_session_id = in_previous_session_id;
+	state->in_security_buffer = in_security_buffer;
+
+	subreq = smbd_smb2_session_setup_send(state, state->ev,
+					      state->smb2req,
+					      state->in_session_id,
+					      state->in_flags,
+					      state->in_security_mode,
+					      state->in_previous_session_id,
+					      state->in_security_buffer);
+	if (tevent_req_nomem(subreq, req)) {
+		return tevent_req_post(req, ev);
+	}
+	tevent_req_set_callback(subreq,
+				smbd_smb2_session_setup_wrap_setup_done, req);
+
+	return req;
+}
+
+static void smbd_smb2_session_setup_wrap_setup_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req =
+		tevent_req_callback_data(subreq,
+		struct tevent_req);
+	struct smbd_smb2_session_setup_wrap_state *state =
+		tevent_req_data(req,
+		struct smbd_smb2_session_setup_wrap_state);
+	NTSTATUS status;
+
+	status = smbd_smb2_session_setup_recv(subreq,
+					      &state->out_session_flags,
+					      state,
+					      &state->out_security_buffer,
+					      &state->out_session_id);
+	TALLOC_FREE(subreq);
+	if (NT_STATUS_IS_OK(status)) {
+		tevent_req_done(req);
+		return;
+	}
+	if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
+		tevent_req_nterror(req, status);
+		return;
+	}
+
+	if (state->smb2req->session == NULL) {
+		tevent_req_nterror(req, status);
+		return;
+	}
+
+	state->error = status;
+
+	if (state->in_flags & SMB2_SESSION_FLAG_BINDING) {
+		status = smbXsrv_session_remove_channel(state->smb2req->session,
+							state->smb2req->xconn);
+		if (tevent_req_nterror(req, status)) {
+			return;
+		}
+		tevent_req_nterror(req, state->error);
+		return;
+	}
+
+	if (NT_STATUS_EQUAL(state->error, NT_STATUS_USER_SESSION_DELETED)) {
+		tevent_req_nterror(req, state->error);
+		return;
+	}
+
+	subreq = smb2srv_session_shutdown_send(state, state->ev,
+					       state->smb2req->session,
+					       state->smb2req);
+	if (tevent_req_nomem(subreq, req)) {
+		return;
+	}
+	tevent_req_set_callback(subreq,
+				smbd_smb2_session_setup_wrap_shutdown_done,
+				req);
+}
+
+static void smbd_smb2_session_setup_wrap_shutdown_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req =
+		tevent_req_callback_data(subreq,
+		struct tevent_req);
+	struct smbd_smb2_session_setup_wrap_state *state =
+		tevent_req_data(req,
+		struct smbd_smb2_session_setup_wrap_state);
+	NTSTATUS status;
+
+	status = smb2srv_session_shutdown_recv(subreq);
+	TALLOC_FREE(subreq);
+	if (tevent_req_nterror(req, status)) {
+		return;
+	}
+
+	/*
+	 * we may need to sign the response, so we need to keep
+	 * the session until the response is sent to the wire.
+	 */
+	talloc_steal(state->smb2req, state->smb2req->session);
+
+	tevent_req_nterror(req, state->error);
+}
+
+static NTSTATUS smbd_smb2_session_setup_wrap_recv(struct tevent_req *req,
+					uint16_t *out_session_flags,
+					TALLOC_CTX *mem_ctx,
+					DATA_BLOB *out_security_buffer,
+					uint64_t *out_session_id)
+{
+	struct smbd_smb2_session_setup_wrap_state *state =
+		tevent_req_data(req,
+		struct smbd_smb2_session_setup_wrap_state);
+	NTSTATUS status;
+
+	if (tevent_req_is_nterror(req, &status)) {
+		if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
+			tevent_req_received(req);
+			return nt_status_squash(status);
+		}
+	} else {
+		status = NT_STATUS_OK;
+	}
+
+	*out_session_flags = state->out_session_flags;
+	*out_security_buffer = state->out_security_buffer;
+	*out_session_id = state->out_session_id;
+
+	talloc_steal(mem_ctx, out_security_buffer->data);
+	tevent_req_received(req);
+	return status;
+}
+
+static struct tevent_req *smbd_smb2_logoff_send(TALLOC_CTX *mem_ctx,
+					struct tevent_context *ev,
+					struct smbd_smb2_request *smb2req);
+static NTSTATUS smbd_smb2_logoff_recv(struct tevent_req *req);
+static void smbd_smb2_request_logoff_done(struct tevent_req *subreq);
+
+NTSTATUS smbd_smb2_request_process_logoff(struct smbd_smb2_request *req)
+{
+	NTSTATUS status;
+	struct tevent_req *subreq = NULL;
+
+	status = smbd_smb2_request_verify_sizes(req, 0x04);
+	if (!NT_STATUS_IS_OK(status)) {
+		return smbd_smb2_request_error(req, status);
+	}
+
+	subreq = smbd_smb2_logoff_send(req, req->sconn->ev_ctx, req);
+	if (subreq == NULL) {
+		return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
+	}
+	tevent_req_set_callback(subreq, smbd_smb2_request_logoff_done, req);
+
+	/*
+	 * Avoid sending a STATUS_PENDING message, it's very likely
+	 * the client won't expect that.
+	 */
+	return smbd_smb2_request_pending_queue(req, subreq, 0);
+}
+
+static void smbd_smb2_request_logoff_done(struct tevent_req *subreq)
+{
+	struct smbd_smb2_request *smb2req =
+		tevent_req_callback_data(subreq,
+		struct smbd_smb2_request);
+	DATA_BLOB outbody;
+	NTSTATUS status;
+	NTSTATUS error;
+
+	status = smbd_smb2_logoff_recv(subreq);
+	TALLOC_FREE(subreq);
+	if (!NT_STATUS_IS_OK(status)) {
+		error = smbd_smb2_request_error(smb2req, status);
+		if (!NT_STATUS_IS_OK(error)) {
+			smbd_server_connection_terminate(smb2req->xconn,
+							nt_errstr(error));
+			return;
+		}
+		return;
+	}
+
+	outbody = smbd_smb2_generate_outbody(smb2req, 0x04);
+	if (outbody.data == NULL) {
+		error = smbd_smb2_request_error(smb2req, NT_STATUS_NO_MEMORY);
+		if (!NT_STATUS_IS_OK(error)) {
+			smbd_server_connection_terminate(smb2req->xconn,
+							nt_errstr(error));
+			return;
+		}
+		return;
+	}
+
+	SSVAL(outbody.data, 0x00, 0x04);        /* struct size */
+	SSVAL(outbody.data, 0x02, 0);           /* reserved */
+
+	error = smbd_smb2_request_done(smb2req, outbody, NULL);
+	if (!NT_STATUS_IS_OK(error)) {
+		smbd_server_connection_terminate(smb2req->xconn,
+						nt_errstr(error));
+		return;
+	}
+}
+
+struct smbd_smb2_logoff_state {
+	struct smbd_smb2_request *smb2req;
+};
+
+static void smbd_smb2_logoff_shutdown_done(struct tevent_req *subreq);
+
+static struct tevent_req *smbd_smb2_logoff_send(TALLOC_CTX *mem_ctx,
+					struct tevent_context *ev,
+					struct smbd_smb2_request *smb2req)
+{
+	struct tevent_req *req;
+	struct smbd_smb2_logoff_state *state;
+	struct tevent_req *subreq;
+
+	req = tevent_req_create(mem_ctx, &state,
+			struct smbd_smb2_logoff_state);
+	if (req == NULL) {
+		return NULL;
+	}
+	state->smb2req = smb2req;
+
+	subreq = smb2srv_session_shutdown_send(state, ev,
+					       smb2req->session,
+					       smb2req);
+	if (tevent_req_nomem(subreq, req)) {
+		return tevent_req_post(req, ev);
+	}
+	tevent_req_set_callback(subreq, smbd_smb2_logoff_shutdown_done, req);
+
+	return req;
+}
+
+static void smbd_smb2_logoff_shutdown_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct smbd_smb2_logoff_state *state = tevent_req_data(
+		req, struct smbd_smb2_logoff_state);
+	NTSTATUS status;
+	bool ok;
+	const struct GUID *client_guid =
+		&state->smb2req->session->client->global->client_guid;
+
+	status = smb2srv_session_shutdown_recv(subreq);
+	if (tevent_req_nterror(req, status)) {
+		return;
+	}
+	TALLOC_FREE(subreq);
+
+	if (!GUID_all_zero(client_guid)) {
+		ok = remote_arch_cache_delete(client_guid);
+		if (!ok) {
+			/* Most likely not an error, but not in cache */
+			DBG_DEBUG("Deletion from remote arch cache failed\n");
+		}
+	}
+
+	/*
+	 * As we've been awoken, we may have changed
+	 * uid in the meantime. Ensure we're still
+	 * root (SMB2_OP_LOGOFF has .as_root = true).
+	 */
+	change_to_root_user();
+
+	status = smbXsrv_session_logoff(state->smb2req->session);
+	if (tevent_req_nterror(req, status)) {
+		return;
+	}
+
+	/*
+	 * we may need to sign the response, so we need to keep
+	 * the session until the response is sent to the wire.
+	 */
+	talloc_steal(state->smb2req, state->smb2req->session);
+
+	tevent_req_done(req);
+}
+
+static NTSTATUS smbd_smb2_logoff_recv(struct tevent_req *req)
+{
+	return tevent_req_simple_recv_ntstatus(req);
+}