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/*
Unix SMB/CIFS implementation.
module to store/fetch session keys for the schannel server
Copyright (C) Andrew Tridgell 2004
Copyright (C) Andrew Bartlett <abartlet@samba.org> 2006-2009
Copyright (C) Guenther Deschner 2009
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 "../libcli/auth/libcli_auth.h"
#include "../libcli/auth/schannel_state.h"
#include "../librpc/gen_ndr/ndr_schannel.h"
/********************************************************************
********************************************************************/
NTSTATUS schannel_store_session_key_tdb(struct tdb_context *tdb,
TALLOC_CTX *mem_ctx,
struct netlogon_creds_CredentialState *creds)
{
enum ndr_err_code ndr_err;
DATA_BLOB blob;
TDB_DATA value;
int ret;
char *keystr;
keystr = talloc_asprintf_strupper_m(mem_ctx, "%s/%s",
SECRETS_SCHANNEL_STATE,
creds->computer_name);
if (!keystr) {
return NT_STATUS_NO_MEMORY;
}
ndr_err = ndr_push_struct_blob(&blob, mem_ctx, NULL, creds,
(ndr_push_flags_fn_t)ndr_push_netlogon_creds_CredentialState);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
talloc_free(keystr);
return ndr_map_error2ntstatus(ndr_err);
}
value.dptr = blob.data;
value.dsize = blob.length;
ret = tdb_store_bystring(tdb, keystr, value, TDB_REPLACE);
if (ret != TDB_SUCCESS) {
DEBUG(0,("Unable to add %s to session key db - %s\n",
keystr, tdb_errorstr(tdb)));
talloc_free(keystr);
return NT_STATUS_INTERNAL_DB_CORRUPTION;
}
DEBUG(3,("schannel_store_session_key_tdb: stored schannel info with key %s\n",
keystr));
if (DEBUGLEVEL >= 10) {
NDR_PRINT_DEBUG(netlogon_creds_CredentialState, creds);
}
talloc_free(keystr);
return NT_STATUS_OK;
}
/********************************************************************
********************************************************************/
NTSTATUS schannel_fetch_session_key_tdb(struct tdb_context *tdb,
TALLOC_CTX *mem_ctx,
const char *computer_name,
struct netlogon_creds_CredentialState **pcreds)
{
NTSTATUS status;
TDB_DATA value;
enum ndr_err_code ndr_err;
DATA_BLOB blob;
struct netlogon_creds_CredentialState *creds = NULL;
char *keystr = NULL;
*pcreds = NULL;
keystr = talloc_asprintf_strupper_m(mem_ctx, "%s/%s",
SECRETS_SCHANNEL_STATE,
computer_name);
if (!keystr) {
status = NT_STATUS_NO_MEMORY;
goto done;
}
value = tdb_fetch_bystring(tdb, keystr);
if (!value.dptr) {
DEBUG(0,("schannel_fetch_session_key_tdb: Failed to find entry with key %s\n",
keystr ));
status = NT_STATUS_OBJECT_NAME_NOT_FOUND;
goto done;
}
creds = talloc_zero(mem_ctx, struct netlogon_creds_CredentialState);
if (!creds) {
status = NT_STATUS_NO_MEMORY;
goto done;
}
blob = data_blob_const(value.dptr, value.dsize);
ndr_err = ndr_pull_struct_blob(&blob, mem_ctx, NULL, creds,
(ndr_pull_flags_fn_t)ndr_pull_netlogon_creds_CredentialState);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
status = ndr_map_error2ntstatus(ndr_err);
goto done;
}
if (DEBUGLEVEL >= 10) {
NDR_PRINT_DEBUG(netlogon_creds_CredentialState, creds);
}
DEBUG(3,("schannel_fetch_session_key_tdb: restored schannel info key %s\n",
keystr));
status = NT_STATUS_OK;
done:
talloc_free(keystr);
if (!NT_STATUS_IS_OK(status)) {
talloc_free(creds);
return status;
}
*pcreds = creds;
return NT_STATUS_OK;
}
/********************************************************************
Validate an incoming authenticator against the credentials for the remote
machine.
The credentials are (re)read and from the schannel database, and
written back after the caclulations are performed.
The creds_out parameter (if not NULL) returns the credentials, if
the caller needs some of that information.
********************************************************************/
NTSTATUS schannel_creds_server_step_check_tdb(struct tdb_context *tdb,
TALLOC_CTX *mem_ctx,
const char *computer_name,
bool schannel_required_for_call,
bool schannel_in_use,
struct netr_Authenticator *received_authenticator,
struct netr_Authenticator *return_authenticator,
struct netlogon_creds_CredentialState **creds_out)
{
struct netlogon_creds_CredentialState *creds;
NTSTATUS status;
int ret;
ret = tdb_transaction_start(tdb);
if (ret != 0) {
return NT_STATUS_INTERNAL_DB_CORRUPTION;
}
/* Because this is a shared structure (even across
* disconnects) we must update the database every time we
* update the structure */
status = schannel_fetch_session_key_tdb(tdb, mem_ctx, computer_name,
&creds);
/* If we are flaged that schannel is required for a call, and
* it is not in use, then make this an error */
/* It would be good to make this mandatory once schannel is
* negotiated, but this is not what windows does */
if (schannel_required_for_call && !schannel_in_use) {
DEBUG(0,("schannel_creds_server_step_check_tdb: "
"client %s not using schannel for netlogon, despite negotiating it\n",
creds->computer_name ));
tdb_transaction_cancel(tdb);
return NT_STATUS_ACCESS_DENIED;
}
if (NT_STATUS_IS_OK(status)) {
status = netlogon_creds_server_step_check(creds,
received_authenticator,
return_authenticator);
}
if (NT_STATUS_IS_OK(status)) {
status = schannel_store_session_key_tdb(tdb, mem_ctx, creds);
}
if (NT_STATUS_IS_OK(status)) {
tdb_transaction_commit(tdb);
if (creds_out) {
*creds_out = creds;
talloc_steal(mem_ctx, creds);
}
} else {
tdb_transaction_cancel(tdb);
}
return status;
}
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