wmi-1.3.16 from opsview.com
This commit is contained in:
Are Casilla
@@ -0,0 +1,520 @@
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/*
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Unix SMB/CIFS implementation.
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server side dcerpc authentication code
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Copyright (C) Andrew Tridgell 2003
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Copyright (C) Stefan (metze) Metzmacher 2004
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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 2 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, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "includes.h"
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#include "rpc_server/dcerpc_server.h"
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#include "librpc/gen_ndr/ndr_dcerpc.h"
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#include "auth/credentials/credentials.h"
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#include "auth/gensec/gensec.h"
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/*
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parse any auth information from a dcerpc bind request
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return False if we can't handle the auth request for some
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reason (in which case we send a bind_nak)
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*/
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BOOL dcesrv_auth_bind(struct dcesrv_call_state *call)
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{
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struct cli_credentials *server_credentials;
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struct ncacn_packet *pkt = &call->pkt;
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struct dcesrv_connection *dce_conn = call->conn;
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struct dcesrv_auth *auth = &dce_conn->auth_state;
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NTSTATUS status;
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if (pkt->u.bind.auth_info.length == 0) {
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dce_conn->auth_state.auth_info = NULL;
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return True;
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}
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dce_conn->auth_state.auth_info = talloc(dce_conn, struct dcerpc_auth);
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if (!dce_conn->auth_state.auth_info) {
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return False;
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}
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status = ndr_pull_struct_blob(&pkt->u.bind.auth_info,
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call,
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dce_conn->auth_state.auth_info,
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(ndr_pull_flags_fn_t)ndr_pull_dcerpc_auth);
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if (!NT_STATUS_IS_OK(status)) {
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return False;
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}
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status = gensec_server_start(dce_conn, call->event_ctx, call->msg_ctx, &auth->gensec_security);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(1, ("Failed to start GENSEC for DCERPC server: %s\n", nt_errstr(status)));
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return False;
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}
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server_credentials
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= cli_credentials_init(call);
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if (!server_credentials) {
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DEBUG(1, ("Failed to init server credentials\n"));
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return False;
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}
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cli_credentials_set_conf(server_credentials);
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status = cli_credentials_set_machine_account(server_credentials);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(10, ("Failed to obtain server credentials, perhaps a standalone server?: %s\n", nt_errstr(status)));
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talloc_free(server_credentials);
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server_credentials = NULL;
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}
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gensec_set_credentials(auth->gensec_security, server_credentials);
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status = gensec_start_mech_by_authtype(auth->gensec_security, auth->auth_info->auth_type,
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auth->auth_info->auth_level);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(1, ("Failed to start GENSEC mechanism for DCERPC server: auth_type=%d, auth_level=%d: %s\n",
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(int)auth->auth_info->auth_type,
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(int)auth->auth_info->auth_level,
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nt_errstr(status)));
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return False;
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}
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return True;
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}
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/*
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add any auth information needed in a bind ack, and process the authentication
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information found in the bind.
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*/
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BOOL dcesrv_auth_bind_ack(struct dcesrv_call_state *call, struct ncacn_packet *pkt)
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{
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struct dcesrv_connection *dce_conn = call->conn;
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NTSTATUS status;
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if (!call->conn->auth_state.gensec_security) {
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return True;
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}
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status = gensec_update(dce_conn->auth_state.gensec_security,
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call,
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dce_conn->auth_state.auth_info->credentials,
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&dce_conn->auth_state.auth_info->credentials);
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if (NT_STATUS_IS_OK(status)) {
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status = gensec_session_info(dce_conn->auth_state.gensec_security,
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&dce_conn->auth_state.session_info);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(1, ("Failed to establish session_info: %s\n", nt_errstr(status)));
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return False;
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}
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/* Now that we are authenticated, go back to the generic session key... */
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dce_conn->auth_state.session_key = dcesrv_generic_session_key;
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return True;
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} else if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
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dce_conn->auth_state.auth_info->auth_pad_length = 0;
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dce_conn->auth_state.auth_info->auth_reserved = 0;
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return True;
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} else {
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DEBUG(2, ("Failed to start dcesrv auth negotiate: %s\n", nt_errstr(status)));
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return False;
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}
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}
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/*
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process the final stage of a auth request
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*/
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BOOL dcesrv_auth_auth3(struct dcesrv_call_state *call)
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{
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struct ncacn_packet *pkt = &call->pkt;
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struct dcesrv_connection *dce_conn = call->conn;
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NTSTATUS status;
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/* We can't work without an existing gensec state, and an new blob to feed it */
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if (!dce_conn->auth_state.auth_info ||
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!dce_conn->auth_state.gensec_security ||
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pkt->u.auth3.auth_info.length == 0) {
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return False;
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}
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status = ndr_pull_struct_blob(&pkt->u.auth3.auth_info,
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call,
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dce_conn->auth_state.auth_info,
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(ndr_pull_flags_fn_t)ndr_pull_dcerpc_auth);
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if (!NT_STATUS_IS_OK(status)) {
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return False;
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}
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/* Pass the extra data we got from the client down to gensec for processing */
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status = gensec_update(dce_conn->auth_state.gensec_security,
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call,
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dce_conn->auth_state.auth_info->credentials,
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&dce_conn->auth_state.auth_info->credentials);
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if (NT_STATUS_IS_OK(status)) {
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status = gensec_session_info(dce_conn->auth_state.gensec_security,
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&dce_conn->auth_state.session_info);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(1, ("Failed to establish session_info: %s\n", nt_errstr(status)));
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return False;
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}
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/* Now that we are authenticated, go back to the generic session key... */
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dce_conn->auth_state.session_key = dcesrv_generic_session_key;
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return True;
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} else {
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DEBUG(4, ("dcesrv_auth_auth3: failed to authenticate: %s\n",
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nt_errstr(status)));
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return False;
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}
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return True;
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}
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/*
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parse any auth information from a dcerpc alter request
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return False if we can't handle the auth request for some
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reason (in which case we send a bind_nak (is this true for here?))
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*/
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BOOL dcesrv_auth_alter(struct dcesrv_call_state *call)
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{
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struct ncacn_packet *pkt = &call->pkt;
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struct dcesrv_connection *dce_conn = call->conn;
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NTSTATUS status;
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/* on a pure interface change there is no auth blob */
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if (pkt->u.alter.auth_info.length == 0) {
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return True;
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}
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/* We can't work without an existing gensec state */
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if (!dce_conn->auth_state.gensec_security) {
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return False;
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}
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dce_conn->auth_state.auth_info = talloc(dce_conn, struct dcerpc_auth);
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if (!dce_conn->auth_state.auth_info) {
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return False;
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}
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status = ndr_pull_struct_blob(&pkt->u.alter.auth_info,
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call,
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dce_conn->auth_state.auth_info,
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(ndr_pull_flags_fn_t)ndr_pull_dcerpc_auth);
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if (!NT_STATUS_IS_OK(status)) {
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return False;
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}
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return True;
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}
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/*
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add any auth information needed in a alter ack, and process the authentication
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information found in the alter.
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*/
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BOOL dcesrv_auth_alter_ack(struct dcesrv_call_state *call, struct ncacn_packet *pkt)
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{
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struct dcesrv_connection *dce_conn = call->conn;
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NTSTATUS status;
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/* on a pure interface change there is no auth_info structure
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setup */
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if (!call->conn->auth_state.auth_info ||
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dce_conn->auth_state.auth_info->credentials.length == 0) {
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return True;
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}
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if (!call->conn->auth_state.gensec_security) {
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return False;
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}
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status = gensec_update(dce_conn->auth_state.gensec_security,
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call,
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dce_conn->auth_state.auth_info->credentials,
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&dce_conn->auth_state.auth_info->credentials);
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if (NT_STATUS_IS_OK(status)) {
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status = gensec_session_info(dce_conn->auth_state.gensec_security,
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&dce_conn->auth_state.session_info);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(1, ("Failed to establish session_info: %s\n", nt_errstr(status)));
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return False;
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}
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/* Now that we are authenticated, got back to the generic session key... */
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dce_conn->auth_state.session_key = dcesrv_generic_session_key;
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return True;
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} else if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
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dce_conn->auth_state.auth_info->auth_pad_length = 0;
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dce_conn->auth_state.auth_info->auth_reserved = 0;
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return True;
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}
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DEBUG(2, ("Failed to finish dcesrv auth alter_ack: %s\n", nt_errstr(status)));
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return False;
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}
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/*
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generate a CONNECT level verifier
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*/
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static NTSTATUS dcesrv_connect_verifier(TALLOC_CTX *mem_ctx, DATA_BLOB *blob)
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{
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*blob = data_blob_talloc(mem_ctx, NULL, 16);
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if (blob->data == NULL) {
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return NT_STATUS_NO_MEMORY;
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}
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SIVAL(blob->data, 0, 1);
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memset(blob->data+4, 0, 12);
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return NT_STATUS_OK;
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}
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/*
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generate a CONNECT level verifier
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*/
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static NTSTATUS dcesrv_check_connect_verifier(DATA_BLOB *blob)
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{
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if (blob->length != 16 ||
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IVAL(blob->data, 0) != 1) {
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return NT_STATUS_ACCESS_DENIED;
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}
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return NT_STATUS_OK;
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}
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/*
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check credentials on a request
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*/
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BOOL dcesrv_auth_request(struct dcesrv_call_state *call, DATA_BLOB *full_packet)
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{
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struct ncacn_packet *pkt = &call->pkt;
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struct dcesrv_connection *dce_conn = call->conn;
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DATA_BLOB auth_blob;
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struct dcerpc_auth auth;
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struct ndr_pull *ndr;
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NTSTATUS status;
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if (!dce_conn->auth_state.auth_info ||
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!dce_conn->auth_state.gensec_security) {
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return True;
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}
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auth_blob.length = 8 + pkt->auth_length;
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/* check for a valid length */
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if (pkt->u.request.stub_and_verifier.length < auth_blob.length) {
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return False;
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}
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auth_blob.data =
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pkt->u.request.stub_and_verifier.data +
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pkt->u.request.stub_and_verifier.length - auth_blob.length;
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pkt->u.request.stub_and_verifier.length -= auth_blob.length;
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/* pull the auth structure */
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ndr = ndr_pull_init_blob(&auth_blob, call);
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if (!ndr) {
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return False;
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}
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if (!(pkt->drep[0] & DCERPC_DREP_LE)) {
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ndr->flags |= LIBNDR_FLAG_BIGENDIAN;
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}
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status = ndr_pull_dcerpc_auth(ndr, NDR_SCALARS|NDR_BUFFERS, &auth);
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if (!NT_STATUS_IS_OK(status)) {
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talloc_free(ndr);
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return False;
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}
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/* check signature or unseal the packet */
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switch (dce_conn->auth_state.auth_info->auth_level) {
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case DCERPC_AUTH_LEVEL_PRIVACY:
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status = gensec_unseal_packet(dce_conn->auth_state.gensec_security,
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call,
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full_packet->data + DCERPC_REQUEST_LENGTH,
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pkt->u.request.stub_and_verifier.length,
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full_packet->data,
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full_packet->length-auth.credentials.length,
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&auth.credentials);
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memcpy(pkt->u.request.stub_and_verifier.data,
|
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full_packet->data + DCERPC_REQUEST_LENGTH,
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pkt->u.request.stub_and_verifier.length);
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||||
break;
|
||||
|
||||
case DCERPC_AUTH_LEVEL_INTEGRITY:
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status = gensec_check_packet(dce_conn->auth_state.gensec_security,
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||||
call,
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pkt->u.request.stub_and_verifier.data,
|
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pkt->u.request.stub_and_verifier.length,
|
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full_packet->data,
|
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full_packet->length-auth.credentials.length,
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||||
&auth.credentials);
|
||||
break;
|
||||
|
||||
case DCERPC_AUTH_LEVEL_CONNECT:
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status = dcesrv_check_connect_verifier(&auth.credentials);
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||||
break;
|
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|
||||
default:
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||||
status = NT_STATUS_INVALID_LEVEL;
|
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break;
|
||||
}
|
||||
|
||||
/* remove the indicated amount of padding */
|
||||
if (pkt->u.request.stub_and_verifier.length < auth.auth_pad_length) {
|
||||
talloc_free(ndr);
|
||||
return False;
|
||||
}
|
||||
pkt->u.request.stub_and_verifier.length -= auth.auth_pad_length;
|
||||
talloc_free(ndr);
|
||||
|
||||
return NT_STATUS_IS_OK(status);
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
push a signed or sealed dcerpc request packet into a blob
|
||||
*/
|
||||
BOOL dcesrv_auth_response(struct dcesrv_call_state *call,
|
||||
DATA_BLOB *blob, struct ncacn_packet *pkt)
|
||||
{
|
||||
struct dcesrv_connection *dce_conn = call->conn;
|
||||
NTSTATUS status;
|
||||
struct ndr_push *ndr;
|
||||
uint32_t payload_length;
|
||||
DATA_BLOB creds2;
|
||||
|
||||
/* non-signed packets are simple */
|
||||
if (!dce_conn->auth_state.auth_info || !dce_conn->auth_state.gensec_security) {
|
||||
status = ncacn_push_auth(blob, call, pkt, NULL);
|
||||
return NT_STATUS_IS_OK(status);
|
||||
}
|
||||
|
||||
ndr = ndr_push_init_ctx(call);
|
||||
if (!ndr) {
|
||||
return False;
|
||||
}
|
||||
|
||||
if (!(pkt->drep[0] & DCERPC_DREP_LE)) {
|
||||
ndr->flags |= LIBNDR_FLAG_BIGENDIAN;
|
||||
}
|
||||
|
||||
status = ndr_push_ncacn_packet(ndr, NDR_SCALARS|NDR_BUFFERS, pkt);
|
||||
if (!NT_STATUS_IS_OK(status)) {
|
||||
return False;
|
||||
}
|
||||
|
||||
/* pad to 16 byte multiple, match win2k3 */
|
||||
dce_conn->auth_state.auth_info->auth_pad_length = NDR_ALIGN(ndr, 16);
|
||||
ndr_push_zero(ndr, dce_conn->auth_state.auth_info->auth_pad_length);
|
||||
|
||||
payload_length = ndr->offset - DCERPC_REQUEST_LENGTH;
|
||||
|
||||
if (dce_conn->auth_state.auth_info->auth_level == DCERPC_AUTH_LEVEL_CONNECT) {
|
||||
status = dcesrv_connect_verifier(call,
|
||||
&dce_conn->auth_state.auth_info->credentials);
|
||||
if (!NT_STATUS_IS_OK(status)) {
|
||||
return False;
|
||||
}
|
||||
} else {
|
||||
|
||||
/* We hope this length is accruate. If must be if the
|
||||
* GENSEC mech does AEAD signing of the packet
|
||||
* headers */
|
||||
dce_conn->auth_state.auth_info->credentials
|
||||
= data_blob_talloc(call, NULL,
|
||||
gensec_sig_size(dce_conn->auth_state.gensec_security,
|
||||
payload_length));
|
||||
data_blob_clear(&dce_conn->auth_state.auth_info->credentials);
|
||||
}
|
||||
|
||||
/* add the auth verifier */
|
||||
status = ndr_push_dcerpc_auth(ndr, NDR_SCALARS|NDR_BUFFERS,
|
||||
dce_conn->auth_state.auth_info);
|
||||
if (!NT_STATUS_IS_OK(status)) {
|
||||
return False;
|
||||
}
|
||||
|
||||
/* extract the whole packet as a blob */
|
||||
*blob = ndr_push_blob(ndr);
|
||||
|
||||
/* fill in the fragment length and auth_length, we can't fill
|
||||
in these earlier as we don't know the signature length (it
|
||||
could be variable length) */
|
||||
dcerpc_set_frag_length(blob, blob->length);
|
||||
|
||||
/* We hope this value is accruate. If must be if the GENSEC
|
||||
* mech does AEAD signing of the packet headers */
|
||||
dcerpc_set_auth_length(blob, dce_conn->auth_state.auth_info->credentials.length);
|
||||
|
||||
/* sign or seal the packet */
|
||||
switch (dce_conn->auth_state.auth_info->auth_level) {
|
||||
case DCERPC_AUTH_LEVEL_PRIVACY:
|
||||
status = gensec_seal_packet(dce_conn->auth_state.gensec_security,
|
||||
call,
|
||||
ndr->data + DCERPC_REQUEST_LENGTH,
|
||||
payload_length,
|
||||
blob->data,
|
||||
blob->length - dce_conn->auth_state.auth_info->credentials.length,
|
||||
&creds2);
|
||||
|
||||
if (NT_STATUS_IS_OK(status)) {
|
||||
blob->length -= dce_conn->auth_state.auth_info->credentials.length;
|
||||
status = data_blob_append(call, blob, creds2.data, creds2.length);
|
||||
}
|
||||
|
||||
/* If we did AEAD signing of the packet headers, then we hope
|
||||
* this value didn't change... */
|
||||
dcerpc_set_auth_length(blob, creds2.length);
|
||||
dcerpc_set_frag_length(blob, dcerpc_get_frag_length(blob)+creds2.length);
|
||||
data_blob_free(&creds2);
|
||||
break;
|
||||
|
||||
case DCERPC_AUTH_LEVEL_INTEGRITY:
|
||||
status = gensec_sign_packet(dce_conn->auth_state.gensec_security,
|
||||
call,
|
||||
ndr->data + DCERPC_REQUEST_LENGTH,
|
||||
payload_length,
|
||||
blob->data,
|
||||
blob->length - dce_conn->auth_state.auth_info->credentials.length,
|
||||
&creds2);
|
||||
if (NT_STATUS_IS_OK(status)) {
|
||||
blob->length -= dce_conn->auth_state.auth_info->credentials.length;
|
||||
status = data_blob_append(call, blob, creds2.data, creds2.length);
|
||||
}
|
||||
|
||||
/* If we did AEAD signing of the packet headers, then we hope
|
||||
* this value didn't change... */
|
||||
dcerpc_set_auth_length(blob, creds2.length);
|
||||
dcerpc_set_frag_length(blob, dcerpc_get_frag_length(blob)+creds2.length);
|
||||
data_blob_free(&creds2);
|
||||
break;
|
||||
|
||||
case DCERPC_AUTH_LEVEL_CONNECT:
|
||||
break;
|
||||
|
||||
default:
|
||||
status = NT_STATUS_INVALID_LEVEL;
|
||||
break;
|
||||
}
|
||||
|
||||
data_blob_free(&dce_conn->auth_state.auth_info->credentials);
|
||||
|
||||
if (!NT_STATUS_IS_OK(status)) {
|
||||
return False;
|
||||
}
|
||||
|
||||
return True;
|
||||
}
|
||||
Reference in New Issue
Block a user