mirror of
https://github.com/samba-team/samba.git
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287 lines
7.6 KiB
C
287 lines
7.6 KiB
C
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/*
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Unix SMB/CIFS implementation.
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dcerpc ncalrpc as system operations
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Copyright (C) 2014 Andreas Schneider <asn@samba.org>
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Copyright (C) 2014 Stefan Metzmacher <metze@samba.org>
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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 "auth/auth.h"
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#include "auth/gensec/gensec.h"
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#include "auth/gensec/gensec_internal.h"
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#include "librpc/gen_ndr/dcerpc.h"
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#include "lib/param/param.h"
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#include "tsocket.h"
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_PUBLIC_ NTSTATUS gensec_ncalrpc_as_system_init(void);
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struct gensec_ncalrpc_state {
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enum {
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GENSEC_NCALRPC_START,
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GENSEC_NCALRPC_MORE,
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GENSEC_NCALRPC_DONE,
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GENSEC_NCALRPC_ERROR,
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} step;
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struct auth_user_info_dc *user_info_dc;
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};
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static NTSTATUS gensec_ncalrpc_client_start(struct gensec_security *gensec_security)
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{
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struct gensec_ncalrpc_state *state;
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state = talloc_zero(gensec_security,
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struct gensec_ncalrpc_state);
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if (state == NULL) {
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return NT_STATUS_NO_MEMORY;
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}
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gensec_security->private_data = state;
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state->step = GENSEC_NCALRPC_START;
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return NT_STATUS_OK;
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}
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static NTSTATUS gensec_ncalrpc_server_start(struct gensec_security *gensec_security)
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{
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struct gensec_ncalrpc_state *state;
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state = talloc_zero(gensec_security,
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struct gensec_ncalrpc_state);
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if (state == NULL) {
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return NT_STATUS_NO_MEMORY;
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}
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gensec_security->private_data = state;
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state->step = GENSEC_NCALRPC_START;
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return NT_STATUS_OK;
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}
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static NTSTATUS gensec_ncalrpc_update(struct gensec_security *gensec_security,
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TALLOC_CTX *mem_ctx,
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struct tevent_context *ev,
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const DATA_BLOB in,
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DATA_BLOB *out)
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{
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struct gensec_ncalrpc_state *state =
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talloc_get_type_abort(gensec_security->private_data,
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struct gensec_ncalrpc_state);
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DATA_BLOB magic_req = data_blob_string_const("NCALRPC_AUTH_TOKEN");
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DATA_BLOB magic_ok = data_blob_string_const("NCALRPC_AUTH_OK");
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DATA_BLOB magic_fail = data_blob_string_const("NCALRPC_AUTH_FAIL");
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char *unix_path = NULL;
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int cmp;
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NTSTATUS status;
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*out = data_blob_null;
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if (state->step >= GENSEC_NCALRPC_DONE) {
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return NT_STATUS_INVALID_PARAMETER;
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}
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switch (gensec_security->gensec_role) {
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case GENSEC_CLIENT:
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switch (state->step) {
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case GENSEC_NCALRPC_START:
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*out = data_blob_dup_talloc(mem_ctx, magic_req);
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if (out->data == NULL) {
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state->step = GENSEC_NCALRPC_ERROR;
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return NT_STATUS_NO_MEMORY;
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}
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state->step = GENSEC_NCALRPC_MORE;
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return NT_STATUS_MORE_PROCESSING_REQUIRED;
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case GENSEC_NCALRPC_MORE:
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cmp = data_blob_cmp(&in, &magic_ok);
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if (cmp != 0) {
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state->step = GENSEC_NCALRPC_ERROR;
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return NT_STATUS_LOGON_FAILURE;
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}
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state->step = GENSEC_NCALRPC_DONE;
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return NT_STATUS_OK;
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case GENSEC_NCALRPC_DONE:
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case GENSEC_NCALRPC_ERROR:
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break;
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}
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state->step = GENSEC_NCALRPC_ERROR;
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return NT_STATUS_INTERNAL_ERROR;
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case GENSEC_SERVER:
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if (state->step != GENSEC_NCALRPC_START) {
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state->step = GENSEC_NCALRPC_ERROR;
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return NT_STATUS_INTERNAL_ERROR;
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}
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cmp = data_blob_cmp(&in, &magic_req);
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if (cmp != 0) {
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state->step = GENSEC_NCALRPC_ERROR;
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*out = data_blob_dup_talloc(mem_ctx, magic_fail);
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if (out->data == NULL) {
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return NT_STATUS_NO_MEMORY;
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}
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return NT_STATUS_LOGON_FAILURE;
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}
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if (gensec_security->remote_addr == NULL) {
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state->step = GENSEC_NCALRPC_ERROR;
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*out = data_blob_dup_talloc(mem_ctx, magic_fail);
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if (out->data == NULL) {
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return NT_STATUS_NO_MEMORY;
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}
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return NT_STATUS_LOGON_FAILURE;
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}
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unix_path = tsocket_address_unix_path(gensec_security->remote_addr,
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state);
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if (unix_path == NULL) {
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state->step = GENSEC_NCALRPC_ERROR;
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*out = data_blob_dup_talloc(mem_ctx, magic_fail);
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if (out->data == NULL) {
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return NT_STATUS_NO_MEMORY;
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}
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return NT_STATUS_LOGON_FAILURE;
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}
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cmp = strcmp(unix_path, "/root/ncalrpc_as_system");
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TALLOC_FREE(unix_path);
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if (cmp != 0) {
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state->step = GENSEC_NCALRPC_ERROR;
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*out = data_blob_dup_talloc(mem_ctx, magic_fail);
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if (out->data == NULL) {
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return NT_STATUS_NO_MEMORY;
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}
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return NT_STATUS_LOGON_FAILURE;
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}
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status = auth_system_user_info_dc(state,
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lpcfg_netbios_name(gensec_security->settings->lp_ctx),
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&state->user_info_dc);
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if (!NT_STATUS_IS_OK(status)) {
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state->step = GENSEC_NCALRPC_ERROR;
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*out = data_blob_dup_talloc(mem_ctx, magic_fail);
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if (out->data == NULL) {
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return NT_STATUS_NO_MEMORY;
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}
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return status;
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}
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*out = data_blob_dup_talloc(mem_ctx, magic_ok);
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if (out->data == NULL) {
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state->step = GENSEC_NCALRPC_ERROR;
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return NT_STATUS_NO_MEMORY;
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}
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state->step = GENSEC_NCALRPC_DONE;
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return NT_STATUS_OK;
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}
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state->step = GENSEC_NCALRPC_ERROR;
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return NT_STATUS_INTERNAL_ERROR;
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}
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static NTSTATUS gensec_ncalrpc_session_info(struct gensec_security *gensec_security,
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TALLOC_CTX *mem_ctx,
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struct auth_session_info **psession_info)
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{
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struct gensec_ncalrpc_state *state =
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talloc_get_type_abort(gensec_security->private_data,
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struct gensec_ncalrpc_state);
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struct auth4_context *auth_ctx = gensec_security->auth_context;
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struct auth_session_info *session_info = NULL;
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uint32_t session_info_flags = 0;
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NTSTATUS status;
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if (gensec_security->gensec_role != GENSEC_SERVER) {
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return NT_STATUS_INVALID_PARAMETER;
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}
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if (state->step != GENSEC_NCALRPC_DONE) {
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return NT_STATUS_INVALID_PARAMETER;
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}
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if (auth_ctx == NULL) {
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DEBUG(0, ("Cannot generate a session_info without the auth_context\n"));
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return NT_STATUS_INTERNAL_ERROR;
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}
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if (auth_ctx->generate_session_info == NULL) {
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DEBUG(0, ("Cannot generate a session_info without the generate_session_info hook\n"));
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return NT_STATUS_INTERNAL_ERROR;
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}
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if (gensec_security->want_features & GENSEC_FEATURE_UNIX_TOKEN) {
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session_info_flags |= AUTH_SESSION_INFO_UNIX_TOKEN;
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}
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session_info_flags |= AUTH_SESSION_INFO_SIMPLE_PRIVILEGES;
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status = auth_ctx->generate_session_info(
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auth_ctx,
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mem_ctx,
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state->user_info_dc,
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state->user_info_dc->info->account_name,
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session_info_flags,
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&session_info);
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if (!NT_STATUS_IS_OK(status)) {
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return status;
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}
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*psession_info = session_info;
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return NT_STATUS_OK;
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}
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/* We have no features */
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static bool gensec_ncalrpc_have_feature(struct gensec_security *gensec_security,
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uint32_t feature)
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{
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if (feature & GENSEC_FEATURE_DCE_STYLE) {
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return true;
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}
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return false;
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}
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static const struct gensec_security_ops gensec_ncalrpc_security_ops = {
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.name = "naclrpc_as_system",
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.auth_type = DCERPC_AUTH_TYPE_NCALRPC_AS_SYSTEM,
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.client_start = gensec_ncalrpc_client_start,
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.server_start = gensec_ncalrpc_server_start,
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.update = gensec_ncalrpc_update,
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.session_info = gensec_ncalrpc_session_info,
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.have_feature = gensec_ncalrpc_have_feature,
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.enabled = true,
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.priority = GENSEC_EXTERNAL,
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};
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_PUBLIC_ NTSTATUS gensec_ncalrpc_as_system_init(void)
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{
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NTSTATUS status;
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status = gensec_register(&gensec_ncalrpc_security_ops);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(0, ("Failed to register '%s' gensec backend!\n",
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gensec_ncalrpc_security_ops.name));
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return status;
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}
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return status;
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}
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