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samba-mirror/source3/smbd/smbXsrv_session.c

1527 lines
38 KiB
C

/*
Unix SMB/CIFS implementation.
Copyright (C) Stefan Metzmacher 2011-2012
Copyright (C) Michael Adam 2012
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/filesys.h"
#include <tevent.h>
#include "smbd/smbd.h"
#include "smbd/globals.h"
#include "dbwrap/dbwrap.h"
#include "dbwrap/dbwrap_rbt.h"
#include "dbwrap/dbwrap_open.h"
#include "dbwrap/dbwrap_watch.h"
#include "session.h"
#include "auth.h"
#include "auth/gensec/gensec.h"
#include "../lib/tsocket/tsocket.h"
#include "../libcli/security/security.h"
#include "messages.h"
#include "lib/util/util_tdb.h"
#include "librpc/gen_ndr/ndr_smbXsrv.h"
#include "serverid.h"
#include "lib/util/tevent_ntstatus.h"
#include "msg_channel.h"
struct smbXsrv_session_table {
struct {
struct db_context *db_ctx;
uint32_t lowest_id;
uint32_t highest_id;
uint32_t max_sessions;
uint32_t num_sessions;
} local;
struct {
struct db_context *db_ctx;
} global;
struct msg_channel *close_channel;
};
static struct db_context *smbXsrv_session_global_db_ctx = NULL;
NTSTATUS smbXsrv_session_global_init(void)
{
const char *global_path = NULL;
struct db_context *db_ctx = NULL;
if (smbXsrv_session_global_db_ctx != NULL) {
return NT_STATUS_OK;
}
/*
* This contains secret information like session keys!
*/
global_path = lock_path("smbXsrv_session_global.tdb");
db_ctx = db_open(NULL, global_path,
0, /* hash_size */
TDB_DEFAULT |
TDB_CLEAR_IF_FIRST |
TDB_INCOMPATIBLE_HASH,
O_RDWR | O_CREAT, 0600,
DBWRAP_LOCK_ORDER_1);
if (db_ctx == NULL) {
NTSTATUS status;
status = map_nt_error_from_unix_common(errno);
return status;
}
smbXsrv_session_global_db_ctx = db_ctx;
return NT_STATUS_OK;
}
/*
* NOTE:
* We need to store the keys in big endian so that dbwrap_rbt's memcmp
* has the same result as integer comparison between the uint32_t
* values.
*
* TODO: implement string based key
*/
#define SMBXSRV_SESSION_GLOBAL_TDB_KEY_SIZE sizeof(uint32_t)
static TDB_DATA smbXsrv_session_global_id_to_key(uint32_t id,
uint8_t *key_buf)
{
TDB_DATA key;
RSIVAL(key_buf, 0, id);
key = make_tdb_data(key_buf, SMBXSRV_SESSION_GLOBAL_TDB_KEY_SIZE);
return key;
}
#if 0
static NTSTATUS smbXsrv_session_global_key_to_id(TDB_DATA key, uint32_t *id)
{
if (id == NULL) {
return NT_STATUS_INVALID_PARAMETER;
}
if (key.dsize != SMBXSRV_SESSION_GLOBAL_TDB_KEY_SIZE) {
return NT_STATUS_INTERNAL_DB_CORRUPTION;
}
*id = RIVAL(key.dptr, 0);
return NT_STATUS_OK;
}
#endif
#define SMBXSRV_SESSION_LOCAL_TDB_KEY_SIZE sizeof(uint32_t)
static TDB_DATA smbXsrv_session_local_id_to_key(uint32_t id,
uint8_t *key_buf)
{
TDB_DATA key;
RSIVAL(key_buf, 0, id);
key = make_tdb_data(key_buf, SMBXSRV_SESSION_LOCAL_TDB_KEY_SIZE);
return key;
}
static NTSTATUS smbXsrv_session_local_key_to_id(TDB_DATA key, uint32_t *id)
{
if (id == NULL) {
return NT_STATUS_INVALID_PARAMETER;
}
if (key.dsize != SMBXSRV_SESSION_LOCAL_TDB_KEY_SIZE) {
return NT_STATUS_INTERNAL_DB_CORRUPTION;
}
*id = RIVAL(key.dptr, 0);
return NT_STATUS_OK;
}
static void smbXsrv_session_close_loop(struct tevent_req *subreq);
static NTSTATUS smbXsrv_session_table_init(struct smbXsrv_connection *conn,
uint32_t lowest_id,
uint32_t highest_id,
uint32_t max_sessions)
{
struct smbXsrv_session_table *table;
NTSTATUS status;
struct tevent_req *subreq;
int ret;
uint64_t max_range;
if (lowest_id > highest_id) {
return NT_STATUS_INTERNAL_ERROR;
}
max_range = highest_id;
max_range -= lowest_id;
max_range += 1;
if (max_sessions > max_range) {
return NT_STATUS_INTERNAL_ERROR;
}
table = talloc_zero(conn, struct smbXsrv_session_table);
if (table == NULL) {
return NT_STATUS_NO_MEMORY;
}
table->local.db_ctx = db_open_rbt(table);
if (table->local.db_ctx == NULL) {
TALLOC_FREE(table);
return NT_STATUS_NO_MEMORY;
}
table->local.lowest_id = lowest_id;
table->local.highest_id = highest_id;
table->local.max_sessions = max_sessions;
status = smbXsrv_session_global_init();
if (!NT_STATUS_IS_OK(status)) {
TALLOC_FREE(table);
return status;
}
table->global.db_ctx = smbXsrv_session_global_db_ctx;
dbwrap_watch_db(table->global.db_ctx, conn->msg_ctx);
ret = msg_channel_init(table, conn->msg_ctx,
MSG_SMBXSRV_SESSION_CLOSE,
&table->close_channel);
if (ret != 0) {
status = map_nt_error_from_unix_common(errno);
TALLOC_FREE(table);
return status;
}
subreq = msg_read_send(table, conn->ev_ctx, table->close_channel);
if (subreq == NULL) {
TALLOC_FREE(table);
return NT_STATUS_NO_MEMORY;
}
tevent_req_set_callback(subreq, smbXsrv_session_close_loop, conn);
conn->session_table = table;
return NT_STATUS_OK;
}
static void smbXsrv_session_close_loop(struct tevent_req *subreq)
{
struct smbXsrv_connection *conn =
tevent_req_callback_data(subreq,
struct smbXsrv_connection);
struct smbXsrv_session_table *table = conn->session_table;
int ret;
struct messaging_rec *rec = NULL;
struct smbXsrv_session_closeB close_blob;
enum ndr_err_code ndr_err;
struct smbXsrv_session_close0 *close_info0 = NULL;
struct smbXsrv_session *session = NULL;
NTSTATUS status;
struct timeval tv = timeval_current();
NTTIME now = timeval_to_nttime(&tv);
ret = msg_read_recv(subreq, talloc_tos(), &rec);
TALLOC_FREE(subreq);
if (ret != 0) {
goto next;
}
ndr_err = ndr_pull_struct_blob(&rec->buf, rec, &close_blob,
(ndr_pull_flags_fn_t)ndr_pull_smbXsrv_session_closeB);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
status = ndr_map_error2ntstatus(ndr_err);
DEBUG(1,("smbXsrv_session_close_loop: "
"ndr_pull_struct_blob - %s\n",
nt_errstr(status)));
goto next;
}
DEBUG(10,("smbXsrv_session_close_loop: MSG_SMBXSRV_SESSION_CLOSE\n"));
if (DEBUGLVL(10)) {
NDR_PRINT_DEBUG(smbXsrv_session_closeB, &close_blob);
}
if (close_blob.version != SMBXSRV_VERSION_0) {
DEBUG(0,("smbXsrv_session_close_loop: "
"ignore invalid version %u\n", close_blob.version));
NDR_PRINT_DEBUG(smbXsrv_session_closeB, &close_blob);
goto next;
}
close_info0 = close_blob.info.info0;
if (close_info0 == NULL) {
DEBUG(0,("smbXsrv_session_close_loop: "
"ignore NULL info %u\n", close_blob.version));
NDR_PRINT_DEBUG(smbXsrv_session_closeB, &close_blob);
goto next;
}
status = smb2srv_session_lookup(conn, close_info0->old_session_wire_id,
now, &session);
if (NT_STATUS_EQUAL(status, NT_STATUS_USER_SESSION_DELETED)) {
DEBUG(4,("smbXsrv_session_close_loop: "
"old_session_wire_id %llu not found\n",
(unsigned long long)close_info0->old_session_wire_id));
if (DEBUGLVL(4)) {
NDR_PRINT_DEBUG(smbXsrv_session_closeB, &close_blob);
}
goto next;
}
if (!NT_STATUS_IS_OK(status) &&
!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED) &&
!NT_STATUS_EQUAL(status, NT_STATUS_NETWORK_SESSION_EXPIRED)) {
DEBUG(1,("smbXsrv_session_close_loop: "
"old_session_wire_id %llu - %s\n",
(unsigned long long)close_info0->old_session_wire_id,
nt_errstr(status)));
if (DEBUGLVL(1)) {
NDR_PRINT_DEBUG(smbXsrv_session_closeB, &close_blob);
}
goto next;
}
if (session->global->session_global_id != close_info0->old_session_global_id) {
DEBUG(1,("smbXsrv_session_close_loop: "
"old_session_wire_id %llu - global %u != %u\n",
(unsigned long long)close_info0->old_session_wire_id,
session->global->session_global_id,
close_info0->old_session_global_id));
if (DEBUGLVL(1)) {
NDR_PRINT_DEBUG(smbXsrv_session_closeB, &close_blob);
}
goto next;
}
if (session->global->creation_time != close_info0->old_creation_time) {
DEBUG(1,("smbXsrv_session_close_loop: "
"old_session_wire_id %llu - "
"creation %s (%llu) != %s (%llu)\n",
(unsigned long long)close_info0->old_session_wire_id,
nt_time_string(rec, session->global->creation_time),
(unsigned long long)session->global->creation_time,
nt_time_string(rec, close_info0->old_creation_time),
(unsigned long long)close_info0->old_creation_time));
if (DEBUGLVL(1)) {
NDR_PRINT_DEBUG(smbXsrv_session_closeB, &close_blob);
}
goto next;
}
/*
* TODO: cancel all outstanding requests on the session
*/
status = smbXsrv_session_logoff(session);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("smbXsrv_session_close_loop: "
"smbXsrv_session_logoff(%llu) failed: %s\n",
(unsigned long long)session->global->session_wire_id,
nt_errstr(status)));
if (DEBUGLVL(1)) {
NDR_PRINT_DEBUG(smbXsrv_session_closeB, &close_blob);
}
}
TALLOC_FREE(session);
next:
TALLOC_FREE(rec);
subreq = msg_read_send(table, conn->ev_ctx, table->close_channel);
if (subreq == NULL) {
smbd_server_connection_terminate(conn->sconn,
"msg_read_send() failed");
return;
}
tevent_req_set_callback(subreq, smbXsrv_session_close_loop, conn);
}
struct smb1srv_session_local_allocate_state {
const uint32_t lowest_id;
const uint32_t highest_id;
uint32_t last_id;
uint32_t useable_id;
NTSTATUS status;
};
static int smb1srv_session_local_allocate_traverse(struct db_record *rec,
void *private_data)
{
struct smb1srv_session_local_allocate_state *state =
(struct smb1srv_session_local_allocate_state *)private_data;
TDB_DATA key = dbwrap_record_get_key(rec);
uint32_t id = 0;
NTSTATUS status;
status = smbXsrv_session_local_key_to_id(key, &id);
if (!NT_STATUS_IS_OK(status)) {
state->status = status;
return -1;
}
if (id <= state->last_id) {
state->status = NT_STATUS_INTERNAL_DB_CORRUPTION;
return -1;
}
state->last_id = id;
if (id > state->useable_id) {
state->status = NT_STATUS_OK;
return -1;
}
if (state->useable_id == state->highest_id) {
state->status = NT_STATUS_INSUFFICIENT_RESOURCES;
return -1;
}
state->useable_id +=1;
return 0;
}
static NTSTATUS smb1srv_session_local_allocate_id(struct db_context *db,
uint32_t lowest_id,
uint32_t highest_id,
TALLOC_CTX *mem_ctx,
struct db_record **_rec,
uint32_t *_id)
{
struct smb1srv_session_local_allocate_state state = {
.lowest_id = lowest_id,
.highest_id = highest_id,
.last_id = 0,
.useable_id = lowest_id,
.status = NT_STATUS_INTERNAL_ERROR,
};
uint32_t i;
uint32_t range;
NTSTATUS status;
int count = 0;
*_rec = NULL;
*_id = 0;
if (lowest_id > highest_id) {
return NT_STATUS_INSUFFICIENT_RESOURCES;
}
/*
* first we try randomly
*/
range = (highest_id - lowest_id) + 1;
for (i = 0; i < (range / 2); i++) {
uint32_t id;
uint8_t key_buf[SMBXSRV_SESSION_LOCAL_TDB_KEY_SIZE];
TDB_DATA key;
TDB_DATA val;
struct db_record *rec = NULL;
id = generate_random() % range;
id += lowest_id;
if (id < lowest_id) {
id = lowest_id;
}
if (id > highest_id) {
id = highest_id;
}
key = smbXsrv_session_local_id_to_key(id, key_buf);
rec = dbwrap_fetch_locked(db, mem_ctx, key);
if (rec == NULL) {
return NT_STATUS_INSUFFICIENT_RESOURCES;
}
val = dbwrap_record_get_value(rec);
if (val.dsize != 0) {
TALLOC_FREE(rec);
continue;
}
*_rec = rec;
*_id = id;
return NT_STATUS_OK;
}
/*
* if the range is almost full,
* we traverse the whole table
* (this relies on sorted behavior of dbwrap_rbt)
*/
status = dbwrap_traverse_read(db, smb1srv_session_local_allocate_traverse,
&state, &count);
if (NT_STATUS_IS_OK(status)) {
if (NT_STATUS_IS_OK(state.status)) {
return NT_STATUS_INTERNAL_ERROR;
}
if (!NT_STATUS_EQUAL(state.status, NT_STATUS_INTERNAL_ERROR)) {
return state.status;
}
if (state.useable_id <= state.highest_id) {
state.status = NT_STATUS_OK;
} else {
return NT_STATUS_INSUFFICIENT_RESOURCES;
}
} else if (!NT_STATUS_EQUAL(status, NT_STATUS_INTERNAL_DB_CORRUPTION)) {
/*
* Here we really expect NT_STATUS_INTERNAL_DB_CORRUPTION!
*
* If we get anything else it is an error, because it
* means we did not manage to find a free slot in
* the db.
*/
return NT_STATUS_INSUFFICIENT_RESOURCES;
}
if (NT_STATUS_IS_OK(state.status)) {
uint32_t id;
uint8_t key_buf[SMBXSRV_SESSION_LOCAL_TDB_KEY_SIZE];
TDB_DATA key;
TDB_DATA val;
struct db_record *rec = NULL;
id = state.useable_id;
key = smbXsrv_session_local_id_to_key(id, key_buf);
rec = dbwrap_fetch_locked(db, mem_ctx, key);
if (rec == NULL) {
return NT_STATUS_INSUFFICIENT_RESOURCES;
}
val = dbwrap_record_get_value(rec);
if (val.dsize != 0) {
TALLOC_FREE(rec);
return NT_STATUS_INTERNAL_DB_CORRUPTION;
}
*_rec = rec;
*_id = id;
return NT_STATUS_OK;
}
return state.status;
}
struct smbXsrv_session_local_fetch_state {
struct smbXsrv_session *session;
NTSTATUS status;
};
static void smbXsrv_session_local_fetch_parser(TDB_DATA key, TDB_DATA data,
void *private_data)
{
struct smbXsrv_session_local_fetch_state *state =
(struct smbXsrv_session_local_fetch_state *)private_data;
void *ptr;
if (data.dsize != sizeof(ptr)) {
state->status = NT_STATUS_INTERNAL_DB_ERROR;
return;
}
memcpy(&ptr, data.dptr, data.dsize);
state->session = talloc_get_type_abort(ptr, struct smbXsrv_session);
state->status = NT_STATUS_OK;
}
static NTSTATUS smbXsrv_session_local_lookup(struct smbXsrv_session_table *table,
uint32_t session_local_id,
NTTIME now,
struct smbXsrv_session **_session)
{
struct smbXsrv_session_local_fetch_state state = {
.session = NULL,
.status = NT_STATUS_INTERNAL_ERROR,
};
uint8_t key_buf[SMBXSRV_SESSION_LOCAL_TDB_KEY_SIZE];
TDB_DATA key;
NTSTATUS status;
*_session = NULL;
if (session_local_id == 0) {
return NT_STATUS_USER_SESSION_DELETED;
}
if (table == NULL) {
/* this might happen before the end of negprot */
return NT_STATUS_USER_SESSION_DELETED;
}
if (table->local.db_ctx == NULL) {
return NT_STATUS_INTERNAL_ERROR;
}
key = smbXsrv_session_local_id_to_key(session_local_id, key_buf);
status = dbwrap_parse_record(table->local.db_ctx, key,
smbXsrv_session_local_fetch_parser,
&state);
if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
return NT_STATUS_USER_SESSION_DELETED;
} else if (!NT_STATUS_IS_OK(status)) {
return status;
}
if (!NT_STATUS_IS_OK(state.status)) {
return state.status;
}
if (NT_STATUS_EQUAL(state.session->status, NT_STATUS_USER_SESSION_DELETED)) {
return NT_STATUS_USER_SESSION_DELETED;
}
state.session->idle_time = now;
if (!NT_STATUS_IS_OK(state.session->status)) {
*_session = state.session;
return state.session->status;
}
if (now > state.session->global->expiration_time) {
state.session->status = NT_STATUS_NETWORK_SESSION_EXPIRED;
}
*_session = state.session;
return state.session->status;
}
static int smbXsrv_session_global_destructor(struct smbXsrv_session_global0 *global)
{
return 0;
}
static void smbXsrv_session_global_verify_record(struct db_record *db_rec,
bool *is_free,
bool *was_free,
TALLOC_CTX *mem_ctx,
struct smbXsrv_session_global0 **_g);
static NTSTATUS smbXsrv_session_global_allocate(struct db_context *db,
TALLOC_CTX *mem_ctx,
struct smbXsrv_session_global0 **_global)
{
uint32_t i;
struct smbXsrv_session_global0 *global = NULL;
uint32_t last_free = 0;
const uint32_t min_tries = 3;
*_global = NULL;
global = talloc_zero(mem_ctx, struct smbXsrv_session_global0);
if (global == NULL) {
return NT_STATUS_NO_MEMORY;
}
talloc_set_destructor(global, smbXsrv_session_global_destructor);
/*
* Here we just randomly try the whole 32-bit space
*
* We use just 32-bit, because we want to reuse the
* ID for SRVSVC.
*/
for (i = 0; i < UINT32_MAX; i++) {
bool is_free = false;
bool was_free = false;
uint32_t id;
uint8_t key_buf[SMBXSRV_SESSION_GLOBAL_TDB_KEY_SIZE];
TDB_DATA key;
if (i >= min_tries && last_free != 0) {
id = last_free;
} else {
id = generate_random();
}
if (id == 0) {
id++;
}
if (id == UINT32_MAX) {
id--;
}
key = smbXsrv_session_global_id_to_key(id, key_buf);
global->db_rec = dbwrap_fetch_locked(db, mem_ctx, key);
if (global->db_rec == NULL) {
talloc_free(global);
return NT_STATUS_INSUFFICIENT_RESOURCES;
}
smbXsrv_session_global_verify_record(global->db_rec,
&is_free,
&was_free,
NULL, NULL);
if (!is_free) {
TALLOC_FREE(global->db_rec);
continue;
}
if (!was_free && i < min_tries) {
/*
* The session_id is free now,
* but was not free before.
*
* This happens if a smbd crashed
* and did not cleanup the record.
*
* If this is one of our first tries,
* then we try to find a real free one.
*/
if (last_free == 0) {
last_free = id;
}
TALLOC_FREE(global->db_rec);
continue;
}
global->session_global_id = id;
*_global = global;
return NT_STATUS_OK;
}
/* should not be reached */
talloc_free(global);
return NT_STATUS_INTERNAL_ERROR;
}
static void smbXsrv_session_global_verify_record(struct db_record *db_rec,
bool *is_free,
bool *was_free,
TALLOC_CTX *mem_ctx,
struct smbXsrv_session_global0 **_g)
{
TDB_DATA key;
TDB_DATA val;
DATA_BLOB blob;
struct smbXsrv_session_globalB global_blob;
enum ndr_err_code ndr_err;
struct smbXsrv_session_global0 *global = NULL;
bool exists;
TALLOC_CTX *frame = talloc_stackframe();
*is_free = false;
if (was_free) {
*was_free = false;
}
if (_g) {
*_g = NULL;
}
key = dbwrap_record_get_key(db_rec);
val = dbwrap_record_get_value(db_rec);
if (val.dsize == 0) {
TALLOC_FREE(frame);
*is_free = true;
if (was_free) {
*was_free = true;
}
return;
}
blob = data_blob_const(val.dptr, val.dsize);
ndr_err = ndr_pull_struct_blob(&blob, frame, &global_blob,
(ndr_pull_flags_fn_t)ndr_pull_smbXsrv_session_globalB);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
NTSTATUS status = ndr_map_error2ntstatus(ndr_err);
DEBUG(1,("smbXsrv_session_global_verify_record: "
"key '%s' ndr_pull_struct_blob - %s\n",
hex_encode_talloc(frame, key.dptr, key.dsize),
nt_errstr(status)));
TALLOC_FREE(frame);
return;
}
DEBUG(10,("smbXsrv_session_global_verify_record\n"));
if (DEBUGLVL(10)) {
NDR_PRINT_DEBUG(smbXsrv_session_globalB, &global_blob);
}
if (global_blob.version != SMBXSRV_VERSION_0) {
DEBUG(0,("smbXsrv_session_global_verify_record: "
"key '%s' use unsupported version %u\n",
hex_encode_talloc(frame, key.dptr, key.dsize),
global_blob.version));
NDR_PRINT_DEBUG(smbXsrv_session_globalB, &global_blob);
TALLOC_FREE(frame);
return;
}
global = global_blob.info.info0;
exists = serverid_exists(&global->channels[0].server_id);
if (!exists) {
DEBUG(2,("smbXsrv_session_global_verify_record: "
"key '%s' server_id %s does not exist.\n",
hex_encode_talloc(frame, key.dptr, key.dsize),
server_id_str(frame, &global->channels[0].server_id)));
if (DEBUGLVL(2)) {
NDR_PRINT_DEBUG(smbXsrv_session_globalB, &global_blob);
}
TALLOC_FREE(frame);
dbwrap_record_delete(db_rec);
*is_free = true;
return;
}
if (_g) {
*_g = talloc_move(mem_ctx, &global);
}
TALLOC_FREE(frame);
}
static NTSTATUS smbXsrv_session_global_store(struct smbXsrv_session_global0 *global)
{
struct smbXsrv_session_globalB global_blob;
DATA_BLOB blob = data_blob_null;
TDB_DATA key;
TDB_DATA val;
NTSTATUS status;
enum ndr_err_code ndr_err;
/*
* TODO: if we use other versions than '0'
* we would add glue code here, that would be able to
* store the information in the old format.
*/
if (global->db_rec == NULL) {
return NT_STATUS_INTERNAL_ERROR;
}
key = dbwrap_record_get_key(global->db_rec);
val = dbwrap_record_get_value(global->db_rec);
ZERO_STRUCT(global_blob);
global_blob.version = smbXsrv_version_global_current();
if (val.dsize >= 8) {
global_blob.seqnum = IVAL(val.dptr, 4);
}
global_blob.seqnum += 1;
global_blob.info.info0 = global;
ndr_err = ndr_push_struct_blob(&blob, global->db_rec, &global_blob,
(ndr_push_flags_fn_t)ndr_push_smbXsrv_session_globalB);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
status = ndr_map_error2ntstatus(ndr_err);
DEBUG(1,("smbXsrv_session_global_store: key '%s' ndr_push - %s\n",
hex_encode_talloc(global->db_rec, key.dptr, key.dsize),
nt_errstr(status)));
TALLOC_FREE(global->db_rec);
return status;
}
val = make_tdb_data(blob.data, blob.length);
status = dbwrap_record_store(global->db_rec, val, TDB_REPLACE);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(1,("smbXsrv_session_global_store: key '%s' store - %s\n",
hex_encode_talloc(global->db_rec, key.dptr, key.dsize),
nt_errstr(status)));
TALLOC_FREE(global->db_rec);
return status;
}
if (DEBUGLVL(10)) {
DEBUG(10,("smbXsrv_session_global_store: key '%s' stored\n",
hex_encode_talloc(global->db_rec, key.dptr, key.dsize)));
NDR_PRINT_DEBUG(smbXsrv_session_globalB, &global_blob);
}
TALLOC_FREE(global->db_rec);
return NT_STATUS_OK;
}
struct smb2srv_session_close_previous_state {
struct tevent_context *ev;
struct smbXsrv_connection *connection;
struct dom_sid *current_sid;
uint64_t current_session_id;
struct db_record *db_rec;
};
static void smb2srv_session_close_previous_check(struct tevent_req *req);
static void smb2srv_session_close_previous_modified(struct tevent_req *subreq);
struct tevent_req *smb2srv_session_close_previous_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct smbXsrv_connection *conn,
struct auth_session_info *session_info,
uint64_t previous_session_id,
uint64_t current_session_id)
{
struct tevent_req *req;
struct smb2srv_session_close_previous_state *state;
uint32_t global_id = previous_session_id & UINT32_MAX;
uint64_t global_zeros = previous_session_id & 0xFFFFFFFF00000000LLU;
struct smbXsrv_session_table *table = conn->session_table;
struct security_token *current_token = NULL;
uint8_t key_buf[SMBXSRV_SESSION_GLOBAL_TDB_KEY_SIZE];
TDB_DATA key;
req = tevent_req_create(mem_ctx, &state,
struct smb2srv_session_close_previous_state);
if (req == NULL) {
return NULL;
}
state->ev = ev;
state->connection = conn;
state->current_session_id = current_session_id;
if (global_zeros != 0) {
tevent_req_done(req);
return tevent_req_post(req, ev);
}
if (session_info == NULL) {
tevent_req_done(req);
return tevent_req_post(req, ev);
}
current_token = session_info->security_token;
if (current_token->num_sids > PRIMARY_USER_SID_INDEX) {
state->current_sid = &current_token->sids[PRIMARY_USER_SID_INDEX];
}
if (state->current_sid == NULL) {
tevent_req_done(req);
return tevent_req_post(req, ev);
}
if (!security_token_has_nt_authenticated_users(current_token)) {
/* TODO */
tevent_req_done(req);
return tevent_req_post(req, ev);
}
key = smbXsrv_session_global_id_to_key(global_id, key_buf);
state->db_rec = dbwrap_fetch_locked(table->global.db_ctx,
state, key);
if (state->db_rec == NULL) {
tevent_req_nterror(req, NT_STATUS_UNSUCCESSFUL);
return tevent_req_post(req, ev);
}
smb2srv_session_close_previous_check(req);
if (!tevent_req_is_in_progress(req)) {
return tevent_req_post(req, ev);
}
return req;
}
static void smb2srv_session_close_previous_check(struct tevent_req *req)
{
struct smb2srv_session_close_previous_state *state =
tevent_req_data(req,
struct smb2srv_session_close_previous_state);
struct smbXsrv_connection *conn = state->connection;
DATA_BLOB blob;
struct security_token *previous_token = NULL;
struct smbXsrv_session_global0 *global = NULL;
enum ndr_err_code ndr_err;
struct smbXsrv_session_close0 close_info0;
struct smbXsrv_session_closeB close_blob;
struct tevent_req *subreq = NULL;
NTSTATUS status;
bool is_free = false;
smbXsrv_session_global_verify_record(state->db_rec,
&is_free,
NULL,
state,
&global);
if (is_free) {
TALLOC_FREE(state->db_rec);
tevent_req_done(req);
return;
}
if (global->auth_session_info == NULL) {
TALLOC_FREE(state->db_rec);
tevent_req_done(req);
return;
}
previous_token = global->auth_session_info->security_token;
if (!security_token_is_sid(previous_token, state->current_sid)) {
TALLOC_FREE(state->db_rec);
tevent_req_done(req);
return;
}
subreq = dbwrap_record_watch_send(state, state->ev,
state->db_rec, conn->msg_ctx);
if (tevent_req_nomem(subreq, req)) {
TALLOC_FREE(state->db_rec);
return;
}
tevent_req_set_callback(subreq,
smb2srv_session_close_previous_modified,
req);
close_info0.old_session_global_id = global->session_global_id;
close_info0.old_session_wire_id = global->session_wire_id;
close_info0.old_creation_time = global->creation_time;
close_info0.new_session_wire_id = state->current_session_id;
ZERO_STRUCT(close_blob);
close_blob.version = smbXsrv_version_global_current();
close_blob.info.info0 = &close_info0;
ndr_err = ndr_push_struct_blob(&blob, state, &close_blob,
(ndr_push_flags_fn_t)ndr_push_smbXsrv_session_closeB);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
TALLOC_FREE(state->db_rec);
status = ndr_map_error2ntstatus(ndr_err);
DEBUG(1,("smb2srv_session_close_previous_check: "
"old_session[%llu] new_session[%llu] ndr_push - %s\n",
(unsigned long long)close_info0.old_session_wire_id,
(unsigned long long)close_info0.new_session_wire_id,
nt_errstr(status)));
tevent_req_nterror(req, status);
return;
}
status = messaging_send(conn->msg_ctx,
global->channels[0].server_id,
MSG_SMBXSRV_SESSION_CLOSE, &blob);
TALLOC_FREE(state->db_rec);
if (tevent_req_nterror(req, status)) {
return;
}
TALLOC_FREE(global);
return;
}
static void smb2srv_session_close_previous_modified(struct tevent_req *subreq)
{
struct tevent_req *req =
tevent_req_callback_data(subreq,
struct tevent_req);
struct smb2srv_session_close_previous_state *state =
tevent_req_data(req,
struct smb2srv_session_close_previous_state);
NTSTATUS status;
status = dbwrap_record_watch_recv(subreq, state, &state->db_rec);
TALLOC_FREE(subreq);
if (tevent_req_nterror(req, status)) {
return;
}
smb2srv_session_close_previous_check(req);
}
NTSTATUS smb2srv_session_close_previous_recv(struct tevent_req *req)
{
NTSTATUS status;
if (tevent_req_is_nterror(req, &status)) {
tevent_req_received(req);
return status;
}
tevent_req_received(req);
return NT_STATUS_OK;
}
static int smbXsrv_session_destructor(struct smbXsrv_session *session)
{
NTSTATUS status;
status = smbXsrv_session_logoff(session);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("smbXsrv_session_destructor: "
"smbXsrv_session_logoff() failed: %s\n",
nt_errstr(status)));
}
TALLOC_FREE(session->global);
return 0;
}
NTSTATUS smbXsrv_session_create(struct smbXsrv_connection *conn,
NTTIME now,
struct smbXsrv_session **_session)
{
struct smbXsrv_session_table *table = conn->session_table;
struct db_record *local_rec = NULL;
struct smbXsrv_session *session = NULL;
void *ptr = NULL;
TDB_DATA val;
struct smbXsrv_session_global0 *global = NULL;
struct smbXsrv_channel_global0 *channels = NULL;
NTSTATUS status;
if (table->local.num_sessions >= table->local.max_sessions) {
return NT_STATUS_INSUFFICIENT_RESOURCES;
}
session = talloc_zero(table, struct smbXsrv_session);
if (session == NULL) {
return NT_STATUS_NO_MEMORY;
}
session->table = table;
session->idle_time = now;
session->status = NT_STATUS_MORE_PROCESSING_REQUIRED;
session->connection = conn;
status = smbXsrv_session_global_allocate(table->global.db_ctx,
session,
&global);
if (!NT_STATUS_IS_OK(status)) {
TALLOC_FREE(session);
return status;
}
session->global = global;
if (conn->protocol >= PROTOCOL_SMB2_02) {
uint64_t id = global->session_global_id;
uint8_t key_buf[SMBXSRV_SESSION_LOCAL_TDB_KEY_SIZE];
TDB_DATA key;
global->connection_dialect = conn->smb2.server.dialect;
global->session_wire_id = id;
status = smb2srv_tcon_table_init(session);
if (!NT_STATUS_IS_OK(status)) {
TALLOC_FREE(session);
return status;
}
session->local_id = global->session_global_id;
key = smbXsrv_session_local_id_to_key(session->local_id, key_buf);
local_rec = dbwrap_fetch_locked(table->local.db_ctx,
session, key);
if (local_rec == NULL) {
TALLOC_FREE(session);
return NT_STATUS_NO_MEMORY;
}
val = dbwrap_record_get_value(local_rec);
if (val.dsize != 0) {
TALLOC_FREE(session);
return NT_STATUS_INTERNAL_DB_CORRUPTION;
}
} else {
status = smb1srv_session_local_allocate_id(table->local.db_ctx,
table->local.lowest_id,
table->local.highest_id,
session,
&local_rec,
&session->local_id);
if (!NT_STATUS_IS_OK(status)) {
TALLOC_FREE(session);
return status;
}
global->session_wire_id = session->local_id;
}
global->creation_time = now;
global->expiration_time = GENSEC_EXPIRE_TIME_INFINITY;
global->num_channels = 1;
channels = talloc_zero_array(global,
struct smbXsrv_channel_global0,
global->num_channels);
if (channels == NULL) {
TALLOC_FREE(session);
return NT_STATUS_NO_MEMORY;
}
global->channels = channels;
channels[0].server_id = messaging_server_id(conn->msg_ctx);
channels[0].local_address = tsocket_address_string(conn->local_address,
channels);
if (channels[0].local_address == NULL) {
TALLOC_FREE(session);
return NT_STATUS_NO_MEMORY;
}
channels[0].remote_address = tsocket_address_string(conn->remote_address,
channels);
if (channels[0].remote_address == NULL) {
TALLOC_FREE(session);
return NT_STATUS_NO_MEMORY;
}
channels[0].remote_name = talloc_strdup(channels, conn->remote_hostname);
if (channels[0].remote_name == NULL) {
TALLOC_FREE(session);
return NT_STATUS_NO_MEMORY;
}
channels[0].signing_key = data_blob_null;
ptr = session;
val = make_tdb_data((uint8_t const *)&ptr, sizeof(ptr));
status = dbwrap_record_store(local_rec, val, TDB_REPLACE);
TALLOC_FREE(local_rec);
if (!NT_STATUS_IS_OK(status)) {
TALLOC_FREE(session);
return status;
}
table->local.num_sessions += 1;
talloc_set_destructor(session, smbXsrv_session_destructor);
status = smbXsrv_session_global_store(global);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0,("smbXsrv_session_create: "
"global_id (0x%08x) store failed - %s\n",
session->global->session_global_id,
nt_errstr(status)));
TALLOC_FREE(session);
return status;
}
if (DEBUGLVL(10)) {
struct smbXsrv_sessionB session_blob;
ZERO_STRUCT(session_blob);
session_blob.version = SMBXSRV_VERSION_0;
session_blob.info.info0 = session;
DEBUG(10,("smbXsrv_session_create: global_id (0x%08x) stored\n",
session->global->session_global_id));
NDR_PRINT_DEBUG(smbXsrv_sessionB, &session_blob);
}
*_session = session;
return NT_STATUS_OK;
}
NTSTATUS smbXsrv_session_update(struct smbXsrv_session *session)
{
struct smbXsrv_session_table *table = session->table;
NTSTATUS status;
uint8_t key_buf[SMBXSRV_SESSION_GLOBAL_TDB_KEY_SIZE];
TDB_DATA key;
if (session->global->db_rec != NULL) {
DEBUG(0, ("smbXsrv_session_update(0x%08x): "
"Called with db_rec != NULL'\n",
session->global->session_global_id));
return NT_STATUS_INTERNAL_ERROR;
}
key = smbXsrv_session_global_id_to_key(
session->global->session_global_id,
key_buf);
session->global->db_rec = dbwrap_fetch_locked(table->global.db_ctx,
session->global, key);
if (session->global->db_rec == NULL) {
DEBUG(0, ("smbXsrv_session_update(0x%08x): "
"Failed to lock global key '%s'\n",
session->global->session_global_id,
hex_encode_talloc(talloc_tos(), key.dptr,
key.dsize)));
return NT_STATUS_INTERNAL_DB_ERROR;
}
status = smbXsrv_session_global_store(session->global);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0,("smbXsrv_session_update: "
"global_id (0x%08x) store failed - %s\n",
session->global->session_global_id,
nt_errstr(status)));
return status;
}
if (DEBUGLVL(10)) {
struct smbXsrv_sessionB session_blob;
ZERO_STRUCT(session_blob);
session_blob.version = SMBXSRV_VERSION_0;
session_blob.info.info0 = session;
DEBUG(10,("smbXsrv_session_update: global_id (0x%08x) stored\n",
session->global->session_global_id));
NDR_PRINT_DEBUG(smbXsrv_sessionB, &session_blob);
}
return NT_STATUS_OK;
}
NTSTATUS smbXsrv_session_logoff(struct smbXsrv_session *session)
{
struct smbXsrv_session_table *table;
struct db_record *local_rec = NULL;
struct db_record *global_rec = NULL;
struct smbXsrv_connection *conn;
NTSTATUS status;
NTSTATUS error = NT_STATUS_OK;
if (session->table == NULL) {
return NT_STATUS_OK;
}
table = session->table;
session->table = NULL;
conn = session->connection;
session->connection = NULL;
session->status = NT_STATUS_USER_SESSION_DELETED;
global_rec = session->global->db_rec;
session->global->db_rec = NULL;
if (global_rec == NULL) {
uint8_t key_buf[SMBXSRV_SESSION_GLOBAL_TDB_KEY_SIZE];
TDB_DATA key;
key = smbXsrv_session_global_id_to_key(
session->global->session_global_id,
key_buf);
global_rec = dbwrap_fetch_locked(table->global.db_ctx,
session->global, key);
if (global_rec == NULL) {
DEBUG(0, ("smbXsrv_session_logoff(0x%08x): "
"Failed to lock global key '%s'\n",
session->global->session_global_id,
hex_encode_talloc(global_rec, key.dptr,
key.dsize)));
error = NT_STATUS_INTERNAL_ERROR;
}
}
if (global_rec != NULL) {
status = dbwrap_record_delete(global_rec);
if (!NT_STATUS_IS_OK(status)) {
TDB_DATA key = dbwrap_record_get_key(global_rec);
DEBUG(0, ("smbXsrv_session_logoff(0x%08x): "
"failed to delete global key '%s': %s\n",
session->global->session_global_id,
hex_encode_talloc(global_rec, key.dptr,
key.dsize),
nt_errstr(status)));
error = status;
}
}
TALLOC_FREE(global_rec);
local_rec = session->db_rec;
if (local_rec == NULL) {
uint8_t key_buf[SMBXSRV_SESSION_LOCAL_TDB_KEY_SIZE];
TDB_DATA key;
key = smbXsrv_session_local_id_to_key(session->local_id,
key_buf);
local_rec = dbwrap_fetch_locked(table->local.db_ctx,
session, key);
if (local_rec == NULL) {
DEBUG(0, ("smbXsrv_session_logoff(0x%08x): "
"Failed to lock local key '%s'\n",
session->global->session_global_id,
hex_encode_talloc(local_rec, key.dptr,
key.dsize)));
error = NT_STATUS_INTERNAL_ERROR;
}
}
if (local_rec != NULL) {
status = dbwrap_record_delete(local_rec);
if (!NT_STATUS_IS_OK(status)) {
TDB_DATA key = dbwrap_record_get_key(local_rec);
DEBUG(0, ("smbXsrv_session_logoff(0x%08x): "
"failed to delete local key '%s': %s\n",
session->global->session_global_id,
hex_encode_talloc(local_rec, key.dptr,
key.dsize),
nt_errstr(status)));
error = status;
}
table->local.num_sessions -= 1;
}
if (session->db_rec == NULL) {
TALLOC_FREE(local_rec);
}
session->db_rec = NULL;
if (session->compat) {
file_close_user(conn->sconn, session->compat->vuid);
}
if (conn->protocol >= PROTOCOL_SMB2_02) {
status = smb2srv_tcon_disconnect_all(session);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("smbXsrv_session_logoff(0x%08x): "
"smb2srv_tcon_disconnect_all() failed: %s\n",
session->global->session_global_id,
nt_errstr(status)));
error = status;
}
}
if (session->compat) {
invalidate_vuid(conn->sconn, session->compat->vuid);
session->compat = NULL;
}
return error;
}
struct smbXsrv_session_logoff_all_state {
NTSTATUS first_status;
int errors;
};
static int smbXsrv_session_logoff_all_callback(struct db_record *local_rec,
void *private_data);
NTSTATUS smbXsrv_session_logoff_all(struct smbXsrv_connection *conn)
{
struct smbXsrv_session_table *table = conn->session_table;
struct smbXsrv_session_logoff_all_state state;
NTSTATUS status;
int count = 0;
if (table == NULL) {
DEBUG(10, ("smbXsrv_session_logoff_all: "
"empty session_table, nothing to do.\n"));
return NT_STATUS_OK;
}
ZERO_STRUCT(state);
status = dbwrap_traverse(table->local.db_ctx,
smbXsrv_session_logoff_all_callback,
&state, &count);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("smbXsrv_session_logoff_all: "
"dbwrap_traverse() failed: %s\n",
nt_errstr(status)));
return status;
}
if (!NT_STATUS_IS_OK(state.first_status)) {
DEBUG(0, ("smbXsrv_session_logoff_all: "
"count[%d] errors[%d] first[%s]\n",
count, state.errors,
nt_errstr(state.first_status)));
return state.first_status;
}
return NT_STATUS_OK;
}
static int smbXsrv_session_logoff_all_callback(struct db_record *local_rec,
void *private_data)
{
struct smbXsrv_session_logoff_all_state *state =
(struct smbXsrv_session_logoff_all_state *)private_data;
TDB_DATA val;
void *ptr = NULL;
struct smbXsrv_session *session = NULL;
NTSTATUS status;
val = dbwrap_record_get_value(local_rec);
if (val.dsize != sizeof(ptr)) {
status = NT_STATUS_INTERNAL_ERROR;
if (NT_STATUS_IS_OK(state->first_status)) {
state->first_status = status;
}
state->errors++;
return 0;
}
memcpy(&ptr, val.dptr, val.dsize);
session = talloc_get_type_abort(ptr, struct smbXsrv_session);
session->db_rec = local_rec;
status = smbXsrv_session_logoff(session);
if (!NT_STATUS_IS_OK(status)) {
if (NT_STATUS_IS_OK(state->first_status)) {
state->first_status = status;
}
state->errors++;
return 0;
}
return 0;
}
NTSTATUS smb1srv_session_table_init(struct smbXsrv_connection *conn)
{
/*
* Allow a range from 1..65534 with 65534 values.
*/
return smbXsrv_session_table_init(conn, 1, UINT16_MAX - 1,
UINT16_MAX - 1);
}
NTSTATUS smb1srv_session_lookup(struct smbXsrv_connection *conn,
uint16_t vuid, NTTIME now,
struct smbXsrv_session **session)
{
struct smbXsrv_session_table *table = conn->session_table;
uint32_t local_id = vuid;
return smbXsrv_session_local_lookup(table, local_id, now, session);
}
NTSTATUS smb2srv_session_table_init(struct smbXsrv_connection *conn)
{
/*
* Allow a range from 1..4294967294 with 65534 (same as SMB1) values.
*/
return smbXsrv_session_table_init(conn, 1, UINT32_MAX - 1,
UINT16_MAX - 1);
}
NTSTATUS smb2srv_session_lookup(struct smbXsrv_connection *conn,
uint64_t session_id, NTTIME now,
struct smbXsrv_session **session)
{
struct smbXsrv_session_table *table = conn->session_table;
uint32_t local_id = session_id & UINT32_MAX;
uint64_t local_zeros = session_id & 0xFFFFFFFF00000000LLU;
if (local_zeros != 0) {
return NT_STATUS_USER_SESSION_DELETED;
}
return smbXsrv_session_local_lookup(table, local_id, now, session);
}