--- /dev/null
+/*
+ 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 "smbd/smbd.h"
+#include "smbd/globals.h"
+#include "dbwrap/dbwrap.h"
+#include "dbwrap/dbwrap_rbt.h"
+#include "dbwrap/dbwrap_open.h"
+#include "session.h"
+#include "auth.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"
+
+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;
+}
+
+static NTSTATUS smbXsrv_session_table_init(struct smbXsrv_connection *conn,
+ uint32_t lowest_id,
+ uint32_t highest_id)
+{
+ struct smbXsrv_session_table *table = &conn->session_table;
+ NTSTATUS status;
+
+ ZERO_STRUCTP(table);
+ table->local.db_ctx = db_open_rbt(conn);
+ if (table->local.db_ctx == NULL) {
+ return NT_STATUS_NO_MEMORY;
+ }
+ table->local.lowest_id = lowest_id;
+ table->local.highest_id = highest_id;
+
+ status = smbXsrv_session_global_init();
+ if (!NT_STATUS_IS_OK(status)) {
+ return status;
+ }
+
+ table->global.db_ctx = smbXsrv_session_global_db_ctx;
+
+ return NT_STATUS_OK;
+}
+
+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;
+
+ if (key.dsize != sizeof(uint32_t)) {
+ //TODO errno?
+ state->status = NT_STATUS_INTERNAL_DB_CORRUPTION;
+ return -1;
+ }
+
+ /*
+ * NOTE:
+ * We need 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
+ */
+ id = RIVAL(key.dptr, 0);
+
+ if (id <= state->last_id) {
+ //TODO errno?
+ 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;
+ }
+
+ 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;
+ }
+
+ range = (highest_id - lowest_id) + 1;
+
+ for (i = 0; i < range; i++) {
+ uint32_t id;
+ uint8_t key_buf[sizeof(uint32_t)];
+ 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;
+ }
+
+ RSIVAL(key_buf, 0, id);
+ key = make_tdb_data(key_buf, sizeof(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;
+ }
+
+ status = dbwrap_traverse_read(db, smb1srv_session_local_allocate_traverse,
+ &state, &count);
+ 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[sizeof(uint32_t)];
+ TDB_DATA key;
+ TDB_DATA val;
+ struct db_record *rec = NULL;
+
+ id = state.useable_id;
+
+ RSIVAL(key_buf, 0, id);
+ key = make_tdb_data(key_buf, sizeof(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[sizeof(uint32_t)];
+ TDB_DATA key;
+ NTSTATUS status;
+
+ *_session = NULL;
+
+ if (table->local.db_ctx == NULL) {
+ return NT_STATUS_INTERNAL_ERROR;
+ }
+
+ RSIVAL(key_buf, 0, session_local_id);
+ key = make_tdb_data(key_buf, sizeof(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_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 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;
+
+ *_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);
+
+ for (i = 0; i < UINT32_MAX; i++) {
+ uint32_t id;
+ uint8_t key_buf[sizeof(uint32_t)];
+ TDB_DATA key;
+ TDB_DATA val;
+
+ id = generate_random();
+ if (id >= UINT16_MAX) {
+ id = id & UINT16_MAX;
+ }
+ if (id == 0) {
+ id++;
+ }
+ if (id == UINT32_MAX) {
+ id--;
+ }
+
+ RSIVAL(key_buf, 0, id);
+ key = make_tdb_data(key_buf, sizeof(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;
+ }
+
+ val = dbwrap_record_get_value(global->db_rec);
+ if (val.dsize != 0) {
+ 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 NTSTATUS smbXsrv_session_global_store(struct smbXsrv_connection *sconn,
+ struct smbXsrv_session_global0 *global)
+{
+ struct smbXsrv_session_globalB global_blob;
+ DATA_BLOB blob = data_blob_null;
+ 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;
+ }
+
+ val = dbwrap_record_get_value(global->db_rec);
+
+ ZERO_STRUCT(global_blob);
+ global_blob.version = 0;
+ 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_err_code;
+ TALLOC_FREE(global->db_rec);
+ //TODO status = map
+ return status;
+ }
+
+ val = make_tdb_data(blob.data, blob.length);
+ status = dbwrap_record_store(global->db_rec, val, TDB_REPLACE);
+ TALLOC_FREE(global->db_rec);
+ if (!NT_STATUS_IS_OK(status)) {
+ return status;
+ }
+
+ return NT_STATUS_OK;
+}
+
+struct smbXsrv_session_global_fetch_state {
+ TALLOC_CTX *mem_ctx;
+ struct smbXsrv_session_global *session;
+ NTSTATUS status;
+};
+
+static void smbXsrv_session_global_fetch_parser(TDB_DATA key, TDB_DATA data,
+ void *private_data)
+{
+ struct smbXsrv_session_global_fetch_state *state =
+ (struct smbXsrv_session_global_fetch_state *)private_data;
+
+ state->status = NT_STATUS_NOT_IMPLEMENTED;
+}
+
+static NTSTATUS smbXsrv_session_global_lookup(struct smbXsrv_session_table *table,
+ uint32_t session_global_id,
+ TALLOC_CTX *mem_ctx,
+ struct smbXsrv_session_global **_session)
+{
+ struct smbXsrv_session_global_fetch_state state = {
+ .mem_ctx = mem_ctx,
+ .session = NULL,
+ .status = NT_STATUS_INTERNAL_ERROR,
+ };
+ TDB_DATA key;
+ uint8_t key_buf[sizeof(uint32_t)];
+ NTSTATUS status;
+
+ *_session = NULL;
+
+ if (table->global.db_ctx == NULL) {
+ return NT_STATUS_INTERNAL_ERROR;
+ }
+
+ /* TODO: key as string */
+ RSIVAL(key_buf, 0, session_global_id);
+ key = make_tdb_data(key_buf, sizeof(key_buf));
+
+ status = dbwrap_parse_record(table->global.db_ctx, key,
+ smbXsrv_session_global_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;
+ }
+
+ *_session = state.session;
+ return NT_STATUS_OK;
+}
+
+static int smbXsrv_session_destructor(struct smbXsrv_session *session)
+{
+ struct smbXsrv_session_table *table;
+ struct db_record *local_rec = NULL;
+ struct db_record *global_rec = NULL;
+ NTSTATUS status;
+
+ if (session->connection == NULL) {
+ return 0;
+ }
+
+ table = &session->connection->session_table;
+ session->connection = NULL;
+
+ local_rec = session->db_rec;
+ session->db_rec = NULL;
+ if (local_rec == NULL) {
+ uint8_t key_buf[sizeof(uint32_t)];
+ TDB_DATA key;
+
+ RSIVAL(key_buf, 0, session->local_id);
+ key = make_tdb_data(key_buf, sizeof(key_buf));
+
+ local_rec = dbwrap_fetch_locked(table->local.db_ctx,
+ session, key);
+ }
+
+ if (local_rec != NULL) {
+ status = dbwrap_record_delete(local_rec);
+ }
+
+ global_rec = session->global->db_rec;
+ session->global->db_rec = NULL;
+ if (global_rec == NULL) {
+ uint8_t key_buf[sizeof(uint32_t)];
+ TDB_DATA key;
+
+ RSIVAL(key_buf, 0, session->global->session_global_id);
+ key = make_tdb_data(key_buf, sizeof(key_buf));
+
+ global_rec = dbwrap_fetch_locked(table->global.db_ctx,
+ session->global, key);
+ }
+
+ if (global_rec != NULL) {
+ status = dbwrap_record_delete(global_rec);
+ }
+ 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;
+ uint32_t max_sessions = table->local.highest_id - table->local.lowest_id;
+ 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;
+
+ //system("sleep 999999");
+
+ if (table->local.num_sessions >= max_sessions) {
+ return NT_STATUS_INSUFFICIENT_RESOURCES;
+ // TODO smb1 return NT_STATUS_TOO_MANY_SESSIONS;
+ }
+
+ session = talloc_zero(conn, struct smbXsrv_session);
+ if (session == NULL) {
+ return NT_STATUS_NO_MEMORY;
+ }
+ 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;
+
+ talloc_set_destructor(session, smbXsrv_session_destructor);
+
+ if (conn->protocol >= PROTOCOL_SMB2_02) {
+ uint64_t id = global->session_global_id;
+ uint8_t key_buf[sizeof(uint32_t)];
+ TDB_DATA key;
+
+ global->session_wire_id = id;
+ //global->session_wire_id |= (id << 32) & 0xFFFFFFFF00000000ULL;
+
+ session->local_id = global->session_global_id;
+
+ RSIVAL(key_buf, 0, session->local_id);
+ key = make_tdb_data(key_buf, sizeof(key_buf));
+
+ local_rec = dbwrap_fetch_locked(table->local.db_ctx,
+ session, key);
+ if (local_rec == NULL) {
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ val = dbwrap_record_get_value(local_rec);
+ if (val.dsize != 0) {
+ 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)) {
+ return status;
+ }
+
+ global->session_wire_id = session->local_id;
+ }
+
+ 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;
+ }
+
+ global->creation_time = now;
+ global->expiration_time = UINT64_MAX;//NTTIME_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;
+
+ status = smbXsrv_session_global_store(conn,
+ global);
+ if (!NT_STATUS_IS_OK(status)) {
+ talloc_free(session);
+ return status;
+ }
+
+ {
+ struct smbXsrv_sessionB session_blob;
+
+ ZERO_STRUCT(session_blob);
+ session_blob.version = 0;
+ session_blob.info.info0 = session;
+
+ 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->connection->session_table;
+ NTSTATUS status;
+ uint8_t key_buf[sizeof(uint32_t)];
+ TDB_DATA key;
+
+ if (session->global->db_rec != NULL) {
+ return NT_STATUS_INTERNAL_ERROR;
+ }
+
+ RSIVAL(key_buf, 0, session->global->session_global_id);
+ key = make_tdb_data(key_buf, sizeof(key_buf));
+
+ session->global->db_rec = dbwrap_fetch_locked(table->global.db_ctx,
+ session->global, key);
+ if (session->global->db_rec == NULL) {
+ // TODO proper return code?
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ status = smbXsrv_session_global_store(session->connection,
+ session->global);
+ if (!NT_STATUS_IS_OK(status)) {
+ /* debug */
+ return status;
+ }
+
+ {
+ struct smbXsrv_sessionB session_blob;
+
+ ZERO_STRUCT(session_blob);
+ session_blob.version = 0;
+ session_blob.info.info0 = session;
+
+ NDR_PRINT_DEBUG(smbXsrv_sessionB, &session_blob);
+ }
+
+ return NT_STATUS_OK;
+}
+
+NTSTATUS smb1srv_session_table_init(struct smbXsrv_connection *conn)
+{
+ /*
+ * Allow a range from 100..65534.
+ */
+ return smbXsrv_session_table_init(conn, 100, UINT16_MAX - 1);
+}
+
+NTSTATUS smb1srv_session_lookup(struct smbXsrv_session_table *table,
+ uint16_t vuid, NTTIME now,
+ struct smbXsrv_session **session)
+{
+ uint32_t local_id = vuid;
+
+ return smbXsrv_session_local_lookup(table, local_id, now, session);
+}
+
+NTSTATUS smb2srv_session_table_init(struct smbXsrv_connection *conn)
+{
+ /*
+ * For now use the same range as SMB1.
+ *
+ * Allow a range from 100..65534.
+ */
+ return smbXsrv_session_table_init(conn, 100, UINT16_MAX - 1);
+}
+
+NTSTATUS smb2srv_session_lookup(struct smbXsrv_session_table *table,
+ uint64_t session_id, NTTIME now,
+ struct smbXsrv_session **session)
+{
+ uint32_t local_id = session_id & UINT32_MAX;
+
+ return smbXsrv_session_local_lookup(table, local_id, now, session);
+}
+
git.samba.org / metze / samba / wip.git / commitdiff