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c5f4378361
by making our gensec structures a talloc child of the open connection
we can be sure that it will be destroyed when the connection is
dropped.
(This used to be commit f12ee2f241
)
420 lines
12 KiB
C
420 lines
12 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 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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/*
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startup the cryptographic side of an authenticated dcerpc server
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*/
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NTSTATUS dcesrv_crypto_select_type(struct dcesrv_connection *dce_conn,
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struct dcesrv_auth *auth)
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{
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NTSTATUS status;
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if (auth->auth_info->auth_level != DCERPC_AUTH_LEVEL_INTEGRITY &&
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auth->auth_info->auth_level != DCERPC_AUTH_LEVEL_PRIVACY &&
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auth->auth_info->auth_level != DCERPC_AUTH_LEVEL_CONNECT) {
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DEBUG(2,("auth_level %d not supported in dcesrv auth\n",
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auth->auth_info->auth_level));
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return NT_STATUS_INVALID_PARAMETER;
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}
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if (auth->gensec_security != NULL) {
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/* TODO:
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* this this function should not be called
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* twice per dcesrv_connection!
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*
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* so we need to find out the right
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* dcerpc error to return
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*/
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}
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status = gensec_server_start(dce_conn, &auth->gensec_security);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(1, ("Failed to start GENSEC server code: %s\n", nt_errstr(status)));
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return status;
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}
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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 mech-specific server code (%d): %s\n",
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(int)auth->auth_info->auth_type,
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nt_errstr(status)));
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return status;
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}
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return status;
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}
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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 dcerpc_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->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_p(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 = dcesrv_crypto_select_type(dce_conn, &dce_conn->auth_state);
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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 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 dcerpc_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, 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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} 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 dcerpc_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.auth.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.auth.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, 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 {
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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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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 dcerpc_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;
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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);
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break;
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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;
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}
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/* remove the indicated amount of padding */
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if (pkt->u.request.stub_and_verifier.length < auth.auth_pad_length) {
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talloc_free(ndr);
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return False;
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}
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pkt->u.request.stub_and_verifier.length -= auth.auth_pad_length;
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talloc_free(ndr);
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return NT_STATUS_IS_OK(status);
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}
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/*
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push a signed or sealed dcerpc request packet into a blob
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*/
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BOOL dcesrv_auth_response(struct dcesrv_call_state *call,
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DATA_BLOB *blob, struct dcerpc_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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struct ndr_push *ndr;
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uint32_t payload_length;
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/* non-signed packets are simple */
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if (!dce_conn->auth_state.auth_info || !dce_conn->auth_state.gensec_security) {
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status = dcerpc_push_auth(blob, call, pkt, NULL);
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return NT_STATUS_IS_OK(status);
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}
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ndr = ndr_push_init_ctx(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_push_dcerpc_packet(ndr, NDR_SCALARS|NDR_BUFFERS, pkt);
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if (!NT_STATUS_IS_OK(status)) {
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return False;
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}
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/* pad to 8 byte multiple */
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dce_conn->auth_state.auth_info->auth_pad_length = NDR_ALIGN(ndr, 8);
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ndr_push_zero(ndr, dce_conn->auth_state.auth_info->auth_pad_length);
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payload_length = ndr->offset - DCERPC_REQUEST_LENGTH;
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if (dce_conn->auth_state.auth_info->auth_level == DCERPC_AUTH_LEVEL_CONNECT) {
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status = dcesrv_connect_verifier(call,
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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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return False;
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}
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} else {
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dce_conn->auth_state.auth_info->credentials
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= data_blob_talloc(call, NULL,
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gensec_sig_size(dce_conn->auth_state.gensec_security));
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}
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/* add the auth verifier */
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status = ndr_push_dcerpc_auth(ndr, NDR_SCALARS|NDR_BUFFERS, dce_conn->auth_state.auth_info);
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if (!NT_STATUS_IS_OK(status)) {
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return False;
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}
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/* extract the whole packet as a blob */
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*blob = ndr_push_blob(ndr);
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/* fill in the fragment length and auth_length, we can't fill
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in these earlier as we don't know the signature length (it
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could be variable length) */
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dcerpc_set_frag_length(blob, blob->length);
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dcerpc_set_auth_length(blob, dce_conn->auth_state.auth_info->credentials.length);
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/* sign or seal 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_seal_packet(dce_conn->auth_state.gensec_security,
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call,
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ndr->data + DCERPC_REQUEST_LENGTH,
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payload_length,
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blob->data,
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blob->length - dce_conn->auth_state.auth_info->credentials.length,
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&dce_conn->auth_state.auth_info->credentials);
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break;
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case DCERPC_AUTH_LEVEL_INTEGRITY:
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status = gensec_sign_packet(dce_conn->auth_state.gensec_security,
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call,
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ndr->data + DCERPC_REQUEST_LENGTH,
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payload_length,
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blob->data,
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blob->length - dce_conn->auth_state.auth_info->credentials.length,
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&dce_conn->auth_state.auth_info->credentials);
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break;
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case DCERPC_AUTH_LEVEL_CONNECT:
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break;
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default:
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status = NT_STATUS_INVALID_LEVEL;
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break;
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}
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if (!NT_STATUS_IS_OK(status)) {
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return False;
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}
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memcpy(blob->data + blob->length - dce_conn->auth_state.auth_info->credentials.length,
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dce_conn->auth_state.auth_info->credentials.data, dce_conn->auth_state.auth_info->credentials.length);
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data_blob_free(&dce_conn->auth_state.auth_info->credentials);
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return True;
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}
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