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/*
Unix SMB2 implementation.
Copyright (C) Andrew Bartlett 2001-2005
Copyright (C) Stefan Metzmacher 2005
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 "auth/credentials/credentials.h"
#include "auth/gensec/gensec.h"
#include "auth/auth.h"
#include "libcli/smb2/smb2.h"
#include "libcli/smb2/smb2_calls.h"
#include "smb_server/smb_server.h"
#include "smb_server/service_smb_proto.h"
#include "smb_server/smb2/smb2_server.h"
#include "smbd/service_stream.h"
#include "param/param.h"
static void smb2srv_sesssetup_send(struct smb2srv_request *req, union smb_sesssetup *io)
{
uint16_t credit;
if (NT_STATUS_IS_OK(req->status)) {
credit = 0x0003;
} else if (NT_STATUS_EQUAL(req->status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
credit = 0x0002;
} else {
smb2srv_send_error(req, req->status);
return;
}
SMB2SRV_CHECK(smb2srv_setup_reply(req, 0x08, true, io->smb2.out.secblob.length));
SSVAL(req->out.hdr, SMB2_HDR_CREDIT, credit);
SBVAL(req->out.hdr, SMB2_HDR_SESSION_ID, io->smb2.out.uid);
SSVAL(req->out.body, 0x02, io->smb2.out.session_flags);
SMB2SRV_CHECK(smb2_push_o16s16_blob(&req->out, 0x04, io->smb2.out.secblob));
smb2srv_send_reply(req);
}
struct smb2srv_sesssetup_callback_ctx {
struct smb2srv_request *req;
union smb_sesssetup *io;
struct smbsrv_session *smb_sess;
};
static void smb2srv_sesssetup_callback(struct gensec_update_request *greq, void *private_data)
{
struct smb2srv_sesssetup_callback_ctx *ctx = talloc_get_type(private_data,
struct smb2srv_sesssetup_callback_ctx);
struct smb2srv_request *req = ctx->req;
union smb_sesssetup *io = ctx->io;
struct smbsrv_session *smb_sess = ctx->smb_sess;
struct auth_session_info *session_info = NULL;
NTSTATUS status;
status = gensec_update_recv(greq, req, &io->smb2.out.secblob);
if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
goto done;
} else if (!NT_STATUS_IS_OK(status)) {
goto failed;
}
status = gensec_session_info(smb_sess->gensec_ctx, &session_info);
if (!NT_STATUS_IS_OK(status)) {
goto failed;
}
/* Ensure this is marked as a 'real' vuid, not one
* simply valid for the session setup leg */
status = smbsrv_session_sesssetup_finished(smb_sess, session_info);
if (!NT_STATUS_IS_OK(status)) {
goto failed;
}
req->session = smb_sess;
done:
io->smb2.out.uid = smb_sess->vuid;
failed:
req->status = auth_nt_status_squash(status);
smb2srv_sesssetup_send(req, io);
if (!NT_STATUS_IS_OK(status) && !
NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
talloc_free(smb_sess);
}
}
static void smb2srv_sesssetup_backend(struct smb2srv_request *req, union smb_sesssetup *io)
{
NTSTATUS status;
struct smb2srv_sesssetup_callback_ctx *callback_ctx;
struct smbsrv_session *smb_sess = NULL;
uint64_t vuid;
io->smb2.out.session_flags = 0;
io->smb2.out.uid = 0;
io->smb2.out.secblob = data_blob(NULL, 0);
vuid = BVAL(req->in.hdr, SMB2_HDR_SESSION_ID);
/*
* only when we got '0' we should allocate a new session
*/
if (vuid == 0) {
struct gensec_security *gensec_ctx;
status = gensec_server_start(req,
req->smb_conn->connection->event.ctx,
req->smb_conn->lp_ctx,
req->smb_conn->connection->msg_ctx,
&gensec_ctx);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(1, ("Failed to start GENSEC server code: %s\n", nt_errstr(status)));
goto failed;
}
gensec_set_credentials(gensec_ctx, req->smb_conn->negotiate.server_credentials);
gensec_set_target_service(gensec_ctx, "cifs");
gensec_want_feature(gensec_ctx, GENSEC_FEATURE_SESSION_KEY);
status = gensec_start_mech_by_oid(gensec_ctx, GENSEC_OID_SPNEGO);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(1, ("Failed to start GENSEC SPNEGO server code: %s\n", nt_errstr(status)));
goto failed;
}
/* allocate a new session */
smb_sess = smbsrv_session_new(req->smb_conn, req->smb_conn, gensec_ctx);
if (!smb_sess) {
status = NT_STATUS_INSUFFICIENT_RESOURCES;
goto failed;
}
status = smbsrv_smb2_init_tcons(smb_sess);
if (!NT_STATUS_IS_OK(status)) {
goto failed;
}
} else {
/* lookup an existing session */
smb_sess = smbsrv_session_find_sesssetup(req->smb_conn, vuid);
}
if (!smb_sess) {
status = NT_STATUS_USER_SESSION_DELETED;
goto failed;
}
if (!smb_sess->gensec_ctx) {
status = NT_STATUS_INTERNAL_ERROR;
DEBUG(1, ("Internal ERROR: no gensec_ctx on session: %s\n", nt_errstr(status)));
goto failed;
}
callback_ctx = talloc(req, struct smb2srv_sesssetup_callback_ctx);
if (!callback_ctx) goto nomem;
callback_ctx->req = req;
callback_ctx->io = io;
callback_ctx->smb_sess = smb_sess;
gensec_update_send(smb_sess->gensec_ctx, io->smb2.in.secblob,
smb2srv_sesssetup_callback, callback_ctx);
return;
nomem:
status = NT_STATUS_NO_MEMORY;
failed:
talloc_free(smb_sess);
req->status = auth_nt_status_squash(status);
smb2srv_sesssetup_send(req, io);
}
void smb2srv_sesssetup_recv(struct smb2srv_request *req)
{
union smb_sesssetup *io;
SMB2SRV_CHECK_BODY_SIZE(req, 0x18, true);
SMB2SRV_TALLOC_IO_PTR(io, union smb_sesssetup);
io->smb2.level = RAW_SESSSETUP_SMB2;
io->smb2.in.vc_number = CVAL(req->in.body, 0x02);
io->smb2.in.security_mode = CVAL(req->in.body, 0x03);
io->smb2.in.capabilities = IVAL(req->in.body, 0x04);
io->smb2.in.channel = IVAL(req->in.body, 0x08);
io->smb2.in.previous_sessionid = BVAL(req->in.body, 0x10);
SMB2SRV_CHECK(smb2_pull_o16s16_blob(&req->in, io, req->in.body+0x0C, &io->smb2.in.secblob));
smb2srv_sesssetup_backend(req, io);
}
static NTSTATUS smb2srv_logoff_backend(struct smb2srv_request *req)
{
/* TODO: call ntvfs backends to close file of this session */
talloc_free(req->session);
req->session = NULL;
return NT_STATUS_OK;
}
static void smb2srv_logoff_send(struct smb2srv_request *req)
{
if (NT_STATUS_IS_ERR(req->status)) {
smb2srv_send_error(req, req->status);
return;
}
SMB2SRV_CHECK(smb2srv_setup_reply(req, 0x04, false, 0));
SSVAL(req->out.body, 0x02, 0);
smb2srv_send_reply(req);
}
void smb2srv_logoff_recv(struct smb2srv_request *req)
{
uint16_t _pad;
SMB2SRV_CHECK_BODY_SIZE(req, 0x04, false);
_pad = SVAL(req->in.body, 0x02);
req->status = smb2srv_logoff_backend(req);
if (req->control_flags & SMB2SRV_REQ_CTRL_FLAG_NOT_REPLY) {
talloc_free(req);
return;
}
smb2srv_logoff_send(req);
}
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