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7d8edcc241
BUG: https://bugzilla.samba.org/show_bug.cgi?id=11982 Signed-off-by: Stefan Metzmacher <metze@samba.org> Reviewed-by: Ralph Boehme <slow@samba.org>
695 lines
19 KiB
C
695 lines
19 KiB
C
/*
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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 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 "rpc_server/dcerpc_server.h"
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#include "rpc_server/dcerpc_server_proto.h"
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#include "rpc_server/common/proto.h"
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#include "librpc/rpc/dcerpc_proto.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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#include "auth/auth.h"
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#include "param/param.h"
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#include "librpc/rpc/rpc_common.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 = NULL;
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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->auth_length == 0) {
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auth->auth_type = DCERPC_AUTH_TYPE_NONE;
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auth->auth_level = DCERPC_AUTH_LEVEL_NONE;
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auth->auth_context_id = 0;
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return true;
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}
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status = dcerpc_pull_auth_trailer(pkt, call, &pkt->u.bind.auth_info,
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&call->in_auth_info,
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NULL, true);
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if (!NT_STATUS_IS_OK(status)) {
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/*
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* This will cause a
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* DCERPC_BIND_NAK_REASON_PROTOCOL_VERSION_NOT_SUPPORTED
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* in the caller
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*/
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call->fault_code = DCERPC_NCA_S_PROTO_ERROR;
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return false;
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}
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switch (call->in_auth_info.auth_level) {
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case DCERPC_AUTH_LEVEL_CONNECT:
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case DCERPC_AUTH_LEVEL_CALL:
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case DCERPC_AUTH_LEVEL_PACKET:
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case DCERPC_AUTH_LEVEL_INTEGRITY:
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case DCERPC_AUTH_LEVEL_PRIVACY:
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/*
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* We evaluate auth_type only if auth_level was valid
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*/
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break;
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default:
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/*
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* Setting DCERPC_AUTH_LEVEL_NONE,
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* gives the caller a chance to decide what
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* reject_reason to use
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*
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* Note: DCERPC_AUTH_LEVEL_NONE == 1
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*/
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auth->auth_type = DCERPC_AUTH_TYPE_NONE;
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auth->auth_level = DCERPC_AUTH_LEVEL_NONE;
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auth->auth_context_id = 0;
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return false;
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}
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auth->auth_type = call->in_auth_info.auth_type;
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auth->auth_level = call->in_auth_info.auth_level;
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auth->auth_context_id = call->in_auth_info.auth_context_id;
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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, call->conn->dce_ctx->lp_ctx);
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status = cli_credentials_set_machine_account(server_credentials, call->conn->dce_ctx->lp_ctx);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(1, ("Failed to obtain server credentials: %s\n",
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nt_errstr(status)));
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return false;
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}
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status = samba_server_gensec_start(dce_conn, call->event_ctx,
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call->msg_ctx,
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call->conn->dce_ctx->lp_ctx,
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server_credentials,
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NULL,
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&auth->gensec_security);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(1, ("Failed to call samba_server_gensec_start %s\n",
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nt_errstr(status)));
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return false;
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}
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if (call->conn->remote_address != NULL) {
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status = gensec_set_remote_address(auth->gensec_security,
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call->conn->remote_address);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(1, ("Failed to call gensec_set_remote_address() %s\n",
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nt_errstr(status)));
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return false;
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}
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}
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status = gensec_start_mech_by_authtype(auth->gensec_security, auth->auth_type,
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auth->auth_level);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(3, ("Failed to start GENSEC mechanism for DCERPC server: auth_type=%d, auth_level=%d: %s\n",
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(int)auth->auth_type,
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(int)auth->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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NTSTATUS 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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bool want_header_signing = false;
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dce_conn->allow_alter = true;
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dce_conn->allow_auth3 = true;
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if (call->pkt.auth_length == 0) {
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dce_conn->auth_state.auth_finished = true;
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dce_conn->allow_request = true;
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return NT_STATUS_OK;
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}
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/* We can't work without an existing gensec state */
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if (!call->conn->auth_state.gensec_security) {
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return NT_STATUS_INTERNAL_ERROR;
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}
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if (call->pkt.pfc_flags & DCERPC_PFC_FLAG_SUPPORT_HEADER_SIGN) {
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dce_conn->auth_state.client_hdr_signing = true;
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want_header_signing = true;
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}
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if (!lpcfg_parm_bool(call->conn->dce_ctx->lp_ctx, NULL, "dcesrv","header signing", true)) {
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want_header_signing = false;
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}
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call->_out_auth_info = (struct dcerpc_auth) {
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.auth_type = dce_conn->auth_state.auth_type,
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.auth_level = dce_conn->auth_state.auth_level,
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.auth_context_id = dce_conn->auth_state.auth_context_id,
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};
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call->out_auth_info = &call->_out_auth_info;
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status = gensec_update_ev(dce_conn->auth_state.gensec_security,
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call, call->event_ctx,
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call->in_auth_info.credentials,
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&call->out_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,
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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 status;
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}
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dce_conn->auth_state.auth_finished = true;
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dce_conn->allow_request = true;
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if (!gensec_have_feature(dce_conn->auth_state.gensec_security,
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GENSEC_FEATURE_SIGN_PKT_HEADER))
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{
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want_header_signing = false;
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}
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if (want_header_signing) {
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gensec_want_feature(dce_conn->auth_state.gensec_security,
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GENSEC_FEATURE_SIGN_PKT_HEADER);
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dce_conn->auth_state.hdr_signing = true;
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pkt->pfc_flags |= DCERPC_PFC_FLAG_SUPPORT_HEADER_SIGN;
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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 NT_STATUS_OK;
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} else if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
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if (!gensec_have_feature(dce_conn->auth_state.gensec_security,
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GENSEC_FEATURE_SIGN_PKT_HEADER))
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{
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want_header_signing = false;
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}
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if (want_header_signing) {
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gensec_want_feature(dce_conn->auth_state.gensec_security,
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GENSEC_FEATURE_SIGN_PKT_HEADER);
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dce_conn->auth_state.hdr_signing = true;
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pkt->pfc_flags |= DCERPC_PFC_FLAG_SUPPORT_HEADER_SIGN;
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}
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return NT_STATUS_OK;
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} else {
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DEBUG(4, ("GENSEC mech rejected the incoming authentication at bind_ack: %s\n",
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nt_errstr(status)));
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return status;
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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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if (pkt->auth_length == 0) {
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return false;
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}
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if (dce_conn->auth_state.auth_finished) {
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return false;
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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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status = dcerpc_pull_auth_trailer(pkt, call, &pkt->u.auth3.auth_info,
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&call->in_auth_info, NULL, true);
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if (!NT_STATUS_IS_OK(status)) {
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/*
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* Windows returns DCERPC_NCA_S_FAULT_REMOTE_NO_MEMORY
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* instead of DCERPC_NCA_S_PROTO_ERROR.
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*/
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call->fault_code = DCERPC_NCA_S_FAULT_REMOTE_NO_MEMORY;
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return false;
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}
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if (call->in_auth_info.auth_type != dce_conn->auth_state.auth_type) {
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return false;
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}
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if (call->in_auth_info.auth_level != dce_conn->auth_state.auth_level) {
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return false;
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}
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if (call->in_auth_info.auth_context_id != dce_conn->auth_state.auth_context_id) {
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return false;
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}
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call->_out_auth_info = (struct dcerpc_auth) {
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.auth_type = dce_conn->auth_state.auth_type,
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.auth_level = dce_conn->auth_state.auth_level,
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.auth_context_id = dce_conn->auth_state.auth_context_id,
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};
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call->out_auth_info = &call->_out_auth_info;
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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_ev(dce_conn->auth_state.gensec_security,
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call, call->event_ctx,
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call->in_auth_info.credentials,
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&call->out_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,
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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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dce_conn->auth_state.auth_finished = true;
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dce_conn->allow_request = true;
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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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if (call->out_auth_info->credentials.length != 0) {
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DEBUG(4, ("GENSEC produced output token (len=%u) at bind_auth3\n",
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(unsigned)call->out_auth_info->credentials.length));
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return false;
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}
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return true;
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} else {
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DEBUG(4, ("GENSEC mech rejected the incoming authentication at bind_auth3: %s\n",
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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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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->auth_length == 0) {
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if (!dce_conn->auth_state.auth_finished) {
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return false;
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}
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return true;
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}
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if (dce_conn->auth_state.auth_finished) {
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call->fault_code = DCERPC_FAULT_ACCESS_DENIED;
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return false;
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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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status = dcerpc_pull_auth_trailer(pkt, call, &pkt->u.alter.auth_info,
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&call->in_auth_info, NULL, true);
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if (!NT_STATUS_IS_OK(status)) {
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call->fault_code = DCERPC_NCA_S_PROTO_ERROR;
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return false;
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}
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if (call->in_auth_info.auth_type == DCERPC_AUTH_TYPE_NONE) {
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call->fault_code = DCERPC_FAULT_ACCESS_DENIED;
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return false;
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}
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if (call->in_auth_info.auth_type != dce_conn->auth_state.auth_type) {
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return false;
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}
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if (call->in_auth_info.auth_level != dce_conn->auth_state.auth_level) {
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return false;
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}
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if (call->in_auth_info.auth_context_id != dce_conn->auth_state.auth_context_id) {
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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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NTSTATUS 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->pkt.auth_length == 0) {
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return NT_STATUS_OK;
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}
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if (!call->conn->auth_state.gensec_security) {
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return NT_STATUS_INTERNAL_ERROR;
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}
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call->_out_auth_info = (struct dcerpc_auth) {
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.auth_type = dce_conn->auth_state.auth_type,
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.auth_level = dce_conn->auth_state.auth_level,
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.auth_context_id = dce_conn->auth_state.auth_context_id,
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};
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call->out_auth_info = &call->_out_auth_info;
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status = gensec_update_ev(dce_conn->auth_state.gensec_security,
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call, call->event_ctx,
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call->in_auth_info.credentials,
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&call->out_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,
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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 status;
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}
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dce_conn->auth_state.auth_finished = true;
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dce_conn->allow_request = true;
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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 NT_STATUS_OK;
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} else if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
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return NT_STATUS_OK;
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}
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DEBUG(4, ("GENSEC mech rejected the incoming authentication at auth alter_ack: %s\n",
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nt_errstr(status)));
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return status;
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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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NTSTATUS status;
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uint32_t auth_length;
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size_t hdr_size = DCERPC_REQUEST_LENGTH;
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if (!dce_conn->allow_request) {
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return false;
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}
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if (dce_conn->auth_state.auth_invalid) {
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return false;
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}
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if (pkt->pfc_flags & DCERPC_PFC_FLAG_OBJECT_UUID) {
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hdr_size += 16;
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}
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switch (dce_conn->auth_state.auth_level) {
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case DCERPC_AUTH_LEVEL_PRIVACY:
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case DCERPC_AUTH_LEVEL_INTEGRITY:
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break;
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case DCERPC_AUTH_LEVEL_CONNECT:
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if (pkt->auth_length != 0) {
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break;
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}
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return true;
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case DCERPC_AUTH_LEVEL_NONE:
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if (pkt->auth_length != 0) {
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return false;
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}
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return true;
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default:
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return false;
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}
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if (!dce_conn->auth_state.gensec_security) {
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return false;
|
|
}
|
|
|
|
status = dcerpc_pull_auth_trailer(pkt, call,
|
|
&pkt->u.request.stub_and_verifier,
|
|
&call->in_auth_info, &auth_length, false);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
return false;
|
|
}
|
|
|
|
if (call->in_auth_info.auth_type != dce_conn->auth_state.auth_type) {
|
|
return false;
|
|
}
|
|
|
|
if (call->in_auth_info.auth_level != dce_conn->auth_state.auth_level) {
|
|
return false;
|
|
}
|
|
|
|
if (call->in_auth_info.auth_context_id != dce_conn->auth_state.auth_context_id) {
|
|
return false;
|
|
}
|
|
|
|
pkt->u.request.stub_and_verifier.length -= auth_length;
|
|
|
|
/* check signature or unseal the packet */
|
|
switch (dce_conn->auth_state.auth_level) {
|
|
case DCERPC_AUTH_LEVEL_PRIVACY:
|
|
status = gensec_unseal_packet(dce_conn->auth_state.gensec_security,
|
|
full_packet->data + hdr_size,
|
|
pkt->u.request.stub_and_verifier.length,
|
|
full_packet->data,
|
|
full_packet->length-
|
|
call->in_auth_info.credentials.length,
|
|
&call->in_auth_info.credentials);
|
|
memcpy(pkt->u.request.stub_and_verifier.data,
|
|
full_packet->data + hdr_size,
|
|
pkt->u.request.stub_and_verifier.length);
|
|
break;
|
|
|
|
case DCERPC_AUTH_LEVEL_INTEGRITY:
|
|
status = gensec_check_packet(dce_conn->auth_state.gensec_security,
|
|
pkt->u.request.stub_and_verifier.data,
|
|
pkt->u.request.stub_and_verifier.length,
|
|
full_packet->data,
|
|
full_packet->length-
|
|
call->in_auth_info.credentials.length,
|
|
&call->in_auth_info.credentials);
|
|
break;
|
|
|
|
case DCERPC_AUTH_LEVEL_CONNECT:
|
|
/* for now we ignore possible signatures here */
|
|
status = NT_STATUS_OK;
|
|
break;
|
|
|
|
default:
|
|
status = NT_STATUS_INVALID_LEVEL;
|
|
break;
|
|
}
|
|
|
|
/* remove the indicated amount of padding */
|
|
if (pkt->u.request.stub_and_verifier.length < call->in_auth_info.auth_pad_length) {
|
|
return false;
|
|
}
|
|
pkt->u.request.stub_and_verifier.length -= call->in_auth_info.auth_pad_length;
|
|
|
|
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, size_t sig_size,
|
|
struct ncacn_packet *pkt)
|
|
{
|
|
struct dcesrv_connection *dce_conn = call->conn;
|
|
NTSTATUS status;
|
|
enum ndr_err_code ndr_err;
|
|
struct ndr_push *ndr;
|
|
uint32_t payload_length;
|
|
DATA_BLOB creds2;
|
|
|
|
switch (dce_conn->auth_state.auth_level) {
|
|
case DCERPC_AUTH_LEVEL_PRIVACY:
|
|
case DCERPC_AUTH_LEVEL_INTEGRITY:
|
|
if (sig_size == 0) {
|
|
return false;
|
|
}
|
|
|
|
break;
|
|
|
|
case DCERPC_AUTH_LEVEL_CONNECT:
|
|
/*
|
|
* TODO: let the gensec mech decide if it wants to generate a
|
|
* signature that might be needed for schannel...
|
|
*/
|
|
status = ncacn_push_auth(blob, call, pkt, NULL);
|
|
return NT_STATUS_IS_OK(status);
|
|
|
|
case DCERPC_AUTH_LEVEL_NONE:
|
|
status = ncacn_push_auth(blob, call, pkt, NULL);
|
|
return NT_STATUS_IS_OK(status);
|
|
|
|
default:
|
|
return false;
|
|
}
|
|
|
|
if (!dce_conn->auth_state.gensec_security) {
|
|
return false;
|
|
}
|
|
|
|
ndr = ndr_push_init_ctx(call);
|
|
if (!ndr) {
|
|
return false;
|
|
}
|
|
|
|
if (!(pkt->drep[0] & DCERPC_DREP_LE)) {
|
|
ndr->flags |= LIBNDR_FLAG_BIGENDIAN;
|
|
}
|
|
|
|
ndr_err = ndr_push_ncacn_packet(ndr, NDR_SCALARS|NDR_BUFFERS, pkt);
|
|
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
|
|
return false;
|
|
}
|
|
|
|
call->_out_auth_info = (struct dcerpc_auth) {
|
|
.auth_type = dce_conn->auth_state.auth_type,
|
|
.auth_level = dce_conn->auth_state.auth_level,
|
|
.auth_context_id = dce_conn->auth_state.auth_context_id,
|
|
};
|
|
call->out_auth_info = &call->_out_auth_info;
|
|
|
|
/* pad to 16 byte multiple in the payload portion of the
|
|
packet. This matches what w2k3 does. Note that we can't use
|
|
ndr_push_align() as that is relative to the start of the
|
|
whole packet, whereas w2k8 wants it relative to the start
|
|
of the stub */
|
|
call->out_auth_info->auth_pad_length =
|
|
DCERPC_AUTH_PAD_LENGTH(pkt->u.response.stub_and_verifier.length);
|
|
ndr_err = ndr_push_zero(ndr, call->out_auth_info->auth_pad_length);
|
|
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
|
|
return false;
|
|
}
|
|
|
|
payload_length = pkt->u.response.stub_and_verifier.length +
|
|
call->out_auth_info->auth_pad_length;
|
|
|
|
/* add the auth verifier */
|
|
ndr_err = ndr_push_dcerpc_auth(ndr, NDR_SCALARS|NDR_BUFFERS,
|
|
call->out_auth_info);
|
|
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
|
|
return false;
|
|
}
|
|
|
|
/* extract the whole packet as a blob */
|
|
*blob = ndr_push_blob(ndr);
|
|
|
|
/*
|
|
* Setup the frag and auth length in the packet buffer.
|
|
* This is needed if the GENSEC mech does AEAD signing
|
|
* of the packet headers. The signature itself will be
|
|
* appended later.
|
|
*/
|
|
dcerpc_set_frag_length(blob, blob->length + sig_size);
|
|
dcerpc_set_auth_length(blob, sig_size);
|
|
|
|
/* sign or seal the packet */
|
|
switch (dce_conn->auth_state.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,
|
|
&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,
|
|
&creds2);
|
|
break;
|
|
|
|
default:
|
|
status = NT_STATUS_INVALID_LEVEL;
|
|
break;
|
|
}
|
|
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
return false;
|
|
}
|
|
|
|
if (creds2.length != sig_size) {
|
|
DEBUG(3,("dcesrv_auth_response: creds2.length[%u] != sig_size[%u] pad[%u] stub[%u]\n",
|
|
(unsigned)creds2.length, (uint32_t)sig_size,
|
|
(unsigned)call->out_auth_info->auth_pad_length,
|
|
(unsigned)pkt->u.response.stub_and_verifier.length));
|
|
dcerpc_set_frag_length(blob, blob->length + creds2.length);
|
|
dcerpc_set_auth_length(blob, creds2.length);
|
|
}
|
|
|
|
if (!data_blob_append(call, blob, creds2.data, creds2.length)) {
|
|
status = NT_STATUS_NO_MEMORY;
|
|
return false;
|
|
}
|
|
data_blob_free(&creds2);
|
|
|
|
return true;
|
|
}
|