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https://github.com/samba-team/samba.git
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04310cc1c5
Guenther
223 lines
6.1 KiB
C
223 lines
6.1 KiB
C
/*
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Unix SMB/CIFS implementation.
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module to store/fetch session keys for the schannel server
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Copyright (C) Andrew Tridgell 2004
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Copyright (C) Andrew Bartlett <abartlet@samba.org> 2006-2009
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Copyright (C) Guenther Deschner 2009
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "includes.h"
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#include "../libcli/auth/libcli_auth.h"
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#include "../libcli/auth/schannel_state.h"
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#include "../librpc/gen_ndr/ndr_schannel.h"
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/********************************************************************
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********************************************************************/
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NTSTATUS schannel_store_session_key_tdb(struct tdb_context *tdb,
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TALLOC_CTX *mem_ctx,
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struct netlogon_creds_CredentialState *creds)
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{
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enum ndr_err_code ndr_err;
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DATA_BLOB blob;
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TDB_DATA value;
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int ret;
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char *keystr;
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keystr = talloc_asprintf_strupper_m(mem_ctx, "%s/%s",
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SECRETS_SCHANNEL_STATE,
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creds->computer_name);
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if (!keystr) {
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return NT_STATUS_NO_MEMORY;
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}
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ndr_err = ndr_push_struct_blob(&blob, mem_ctx, NULL, creds,
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(ndr_push_flags_fn_t)ndr_push_netlogon_creds_CredentialState);
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if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
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talloc_free(keystr);
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return ndr_map_error2ntstatus(ndr_err);
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}
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value.dptr = blob.data;
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value.dsize = blob.length;
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ret = tdb_store_bystring(tdb, keystr, value, TDB_REPLACE);
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if (ret != TDB_SUCCESS) {
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DEBUG(0,("Unable to add %s to session key db - %s\n",
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keystr, tdb_errorstr(tdb)));
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talloc_free(keystr);
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return NT_STATUS_INTERNAL_DB_CORRUPTION;
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}
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DEBUG(3,("schannel_store_session_key_tdb: stored schannel info with key %s\n",
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keystr));
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if (DEBUGLEVEL >= 10) {
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NDR_PRINT_DEBUG(netlogon_creds_CredentialState, creds);
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}
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talloc_free(keystr);
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return NT_STATUS_OK;
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}
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/********************************************************************
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********************************************************************/
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NTSTATUS schannel_fetch_session_key_tdb(struct tdb_context *tdb,
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TALLOC_CTX *mem_ctx,
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const char *computer_name,
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struct netlogon_creds_CredentialState **pcreds)
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{
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NTSTATUS status;
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TDB_DATA value;
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enum ndr_err_code ndr_err;
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DATA_BLOB blob;
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struct netlogon_creds_CredentialState *creds = NULL;
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char *keystr = NULL;
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*pcreds = NULL;
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keystr = talloc_asprintf_strupper_m(mem_ctx, "%s/%s",
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SECRETS_SCHANNEL_STATE,
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computer_name);
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if (!keystr) {
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status = NT_STATUS_NO_MEMORY;
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goto done;
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}
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value = tdb_fetch_bystring(tdb, keystr);
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if (!value.dptr) {
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DEBUG(0,("schannel_fetch_session_key_tdb: Failed to find entry with key %s\n",
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keystr ));
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status = NT_STATUS_OBJECT_NAME_NOT_FOUND;
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goto done;
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}
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creds = talloc_zero(mem_ctx, struct netlogon_creds_CredentialState);
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if (!creds) {
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status = NT_STATUS_NO_MEMORY;
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goto done;
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}
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blob = data_blob_const(value.dptr, value.dsize);
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ndr_err = ndr_pull_struct_blob(&blob, mem_ctx, NULL, creds,
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(ndr_pull_flags_fn_t)ndr_pull_netlogon_creds_CredentialState);
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if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
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status = ndr_map_error2ntstatus(ndr_err);
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goto done;
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}
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if (DEBUGLEVEL >= 10) {
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NDR_PRINT_DEBUG(netlogon_creds_CredentialState, creds);
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}
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DEBUG(3,("schannel_fetch_session_key_tdb: restored schannel info key %s\n",
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keystr));
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status = NT_STATUS_OK;
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done:
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talloc_free(keystr);
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if (!NT_STATUS_IS_OK(status)) {
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talloc_free(creds);
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return status;
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}
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*pcreds = creds;
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return NT_STATUS_OK;
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}
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/********************************************************************
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Validate an incoming authenticator against the credentials for the remote
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machine.
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The credentials are (re)read and from the schannel database, and
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written back after the caclulations are performed.
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The creds_out parameter (if not NULL) returns the credentials, if
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the caller needs some of that information.
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********************************************************************/
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NTSTATUS schannel_creds_server_step_check_tdb(struct tdb_context *tdb,
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TALLOC_CTX *mem_ctx,
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const char *computer_name,
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bool schannel_required_for_call,
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bool schannel_in_use,
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struct netr_Authenticator *received_authenticator,
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struct netr_Authenticator *return_authenticator,
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struct netlogon_creds_CredentialState **creds_out)
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{
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struct netlogon_creds_CredentialState *creds;
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NTSTATUS status;
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int ret;
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ret = tdb_transaction_start(tdb);
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if (ret != 0) {
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return NT_STATUS_INTERNAL_DB_CORRUPTION;
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}
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/* Because this is a shared structure (even across
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* disconnects) we must update the database every time we
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* update the structure */
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status = schannel_fetch_session_key_tdb(tdb, mem_ctx, computer_name,
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&creds);
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/* If we are flaged that schannel is required for a call, and
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* it is not in use, then make this an error */
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/* It would be good to make this mandatory once schannel is
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* negotiated, but this is not what windows does */
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if (schannel_required_for_call && !schannel_in_use) {
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DEBUG(0,("schannel_creds_server_step_check_tdb: "
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"client %s not using schannel for netlogon, despite negotiating it\n",
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creds->computer_name ));
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tdb_transaction_cancel(tdb);
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return NT_STATUS_ACCESS_DENIED;
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}
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if (NT_STATUS_IS_OK(status)) {
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status = netlogon_creds_server_step_check(creds,
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received_authenticator,
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return_authenticator);
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}
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if (NT_STATUS_IS_OK(status)) {
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status = schannel_store_session_key_tdb(tdb, mem_ctx, creds);
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}
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if (NT_STATUS_IS_OK(status)) {
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tdb_transaction_commit(tdb);
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if (creds_out) {
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*creds_out = creds;
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talloc_steal(mem_ctx, creds);
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}
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} else {
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tdb_transaction_cancel(tdb);
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}
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return status;
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}
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