s3:winbindd: factor winbindd_sids_to_xids into external and internal part

- external part takes winbindd request/reponse structs (with sid strings)
- internal part takes sid lists

The new internal part implements functions wb_sids2xids_* that are
moved into the new module wb_sids2xids.c.

The purpose of this change is to use wb_sids2xids in winbindd_sid_to_uid
and winbindd_sid_to_gid instead of the currently used wb_sid2uid and wb_sid2gid.
We should just have one code path into id mapping and not several that behave
differently.

Signed-off-by: Michael Adam <obnox@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>

1 files changed, 263 insertions, 0 deletions

diff --git a/source3/winbindd/wb_sids2xids.c b/source3/winbindd/wb_sids2xids.c
new file mode 100644
index 0000000000..7a198c18ce
--- /dev/null
+++ b/source3/winbindd/wb_sids2xids.c
@@ -0,0 +1,263 @@
+/*
+   Unix SMB/CIFS implementation.
+   async sids2xids
+   Copyright (C) Volker Lendecke 2011
+   Copyright (C) Michael Adam 2012
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "includes.h"
+#include "winbindd.h"
+#include "../libcli/security/security.h"
+#include "idmap_cache.h"
+#include "librpc/gen_ndr/ndr_wbint_c.h"
+
+struct wb_sids2xids_state {
+	struct tevent_context *ev;
+
+	struct dom_sid *sids;
+	uint32_t num_sids;
+
+	struct id_map *cached;
+
+	struct dom_sid *non_cached;
+	uint32_t num_non_cached;
+
+	struct lsa_RefDomainList *domains;
+	struct lsa_TransNameArray *names;
+
+	struct wbint_TransIDArray ids;
+};
+
+
+static bool wb_sids2xids_in_cache(struct dom_sid *sid, struct id_map *map);
+static void wb_sids2xids_lookupsids_done(struct tevent_req *subreq);
+static void wb_sids2xids_done(struct tevent_req *subreq);
+
+struct tevent_req *wb_sids2xids_send(TALLOC_CTX *mem_ctx,
+				     struct tevent_context *ev,
+				     const struct dom_sid *sids,
+				     const uint32_t num_sids)
+{
+	struct tevent_req *req, *subreq;
+	struct wb_sids2xids_state *state;
+	uint32_t i;
+
+	req = tevent_req_create(mem_ctx, &state,
+				struct wb_sids2xids_state);
+	if (req == NULL) {
+		return NULL;
+	}
+
+	state->ev = ev;
+
+	state->num_sids = num_sids;
+
+	state->sids = talloc_zero_array(state, struct dom_sid, num_sids);
+	if (tevent_req_nomem(state->sids, req)) {
+		return tevent_req_post(req, ev);
+	}
+
+	for (i = 0; i < num_sids; i++) {
+		sid_copy(&state->sids[i], &sids[i]);
+	}
+
+	state->cached = talloc_zero_array(state, struct id_map, num_sids);
+	if (tevent_req_nomem(state->cached, req)) {
+		return tevent_req_post(req, ev);
+	}
+
+	state->non_cached = talloc_array(state, struct dom_sid, num_sids);
+	if (tevent_req_nomem(state->non_cached, req)) {
+		return tevent_req_post(req, ev);
+	}
+
+	/*
+	 * Extract those sids that can not be resolved from cache
+	 * into a separate list to be handed to id mapping, keeping
+	 * the same index.
+	 */
+	for (i=0; i<state->num_sids; i++) {
+
+		DEBUG(10, ("SID %d: %s\n", (int)i,
+			   sid_string_dbg(&state->sids[i])));
+
+		if (wb_sids2xids_in_cache(&state->sids[i], &state->cached[i])) {
+			continue;
+		}
+		sid_copy(&state->non_cached[state->num_non_cached],
+			 &state->sids[i]);
+		state->num_non_cached += 1;
+	}
+
+	if (state->num_non_cached == 0) {
+		tevent_req_done(req);
+		return tevent_req_post(req, ev);
+	}
+
+	subreq = wb_lookupsids_send(state, ev, state->non_cached,
+				    state->num_non_cached);
+	if (tevent_req_nomem(subreq, req)) {
+		return tevent_req_post(req, ev);
+	}
+	tevent_req_set_callback(subreq, wb_sids2xids_lookupsids_done, req);
+	return req;
+}
+
+static bool wb_sids2xids_in_cache(struct dom_sid *sid, struct id_map *map)
+{
+	struct unixid id;
+	bool expired;
+
+	if (!winbindd_use_idmap_cache()) {
+		return false;
+	}
+	if (idmap_cache_find_sid2unixid(sid, &id, &expired)) {
+		if (expired && is_domain_online(find_our_domain())) {
+			return false;
+		}
+		map->sid = sid;
+		map->xid = id;
+		map->status = ID_MAPPED;
+		return true;
+	}
+	return false;
+}
+
+static enum id_type lsa_SidType_to_id_type(const enum lsa_SidType sid_type);
+
+static void wb_sids2xids_lookupsids_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct wb_sids2xids_state *state = tevent_req_data(
+		req, struct wb_sids2xids_state);
+	struct winbindd_child *child;
+	NTSTATUS status;
+	int i;
+
+	status = wb_lookupsids_recv(subreq, state, &state->domains,
+				    &state->names);
+	TALLOC_FREE(subreq);
+	if (tevent_req_nterror(req, status)) {
+		return;
+	}
+
+	state->ids.num_ids = state->num_non_cached;
+	state->ids.ids = talloc_array(state, struct wbint_TransID,
+				      state->num_non_cached);
+	if (tevent_req_nomem(state->ids.ids, req)) {
+		return;
+	}
+
+	for (i=0; i<state->num_non_cached; i++) {
+		struct lsa_TranslatedName *n = &state->names->names[i];
+		struct wbint_TransID *t = &state->ids.ids[i];
+
+		t->type = lsa_SidType_to_id_type(n->sid_type);
+		t->domain_index = n->sid_index;
+		sid_peek_rid(&state->non_cached[i], &t->rid);
+		t->unix_id = (uint64_t)-1;
+	}
+
+	child = idmap_child();
+
+	subreq = dcerpc_wbint_Sids2UnixIDs_send(
+		state, state->ev, child->binding_handle, state->domains,
+		&state->ids);
+	if (tevent_req_nomem(subreq, req)) {
+		return;
+	}
+	tevent_req_set_callback(subreq, wb_sids2xids_done, req);
+}
+
+static enum id_type lsa_SidType_to_id_type(const enum lsa_SidType sid_type)
+{
+	enum id_type type;
+
+	switch(sid_type) {
+	case SID_NAME_COMPUTER:
+	case SID_NAME_USER:
+		type = ID_TYPE_UID;
+		break;
+	case SID_NAME_DOM_GRP:
+	case SID_NAME_ALIAS:
+	case SID_NAME_WKN_GRP:
+		type = ID_TYPE_GID;
+		break;
+	default:
+		type = ID_TYPE_NOT_SPECIFIED;
+		break;
+	}
+
+	return type;
+}
+
+
+static void wb_sids2xids_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct wb_sids2xids_state *state = tevent_req_data(
+		req, struct wb_sids2xids_state);
+	NTSTATUS status, result;
+
+	status = dcerpc_wbint_Sids2UnixIDs_recv(subreq, state, &result);
+	TALLOC_FREE(subreq);
+	if (any_nt_status_not_ok(status, result, &status)) {
+		tevent_req_nterror(req, status);
+		return;
+	}
+	tevent_req_done(req);
+}
+
+NTSTATUS wb_sids2xids_recv(struct tevent_req *req,
+			   struct unixid *xids)
+{
+	struct wb_sids2xids_state *state = tevent_req_data(
+		req, struct wb_sids2xids_state);
+	NTSTATUS status;
+	uint32_t i, num_non_cached;
+
+	if (tevent_req_is_nterror(req, &status)) {
+		DEBUG(5, ("wb_sids_to_xids failed: %s\n", nt_errstr(status)));
+		return status;
+	}
+
+	num_non_cached = 0;
+
+	for (i=0; i<state->num_sids; i++) {
+		struct unixid xid;
+
+		xid.id = UINT32_MAX;
+
+		if (state->cached[i].sid != NULL) {
+			xid = state->cached[i].xid;
+		} else {
+			xid.id = state->ids.ids[num_non_cached].unix_id;
+			xid.type = state->ids.ids[num_non_cached].type;
+
+			idmap_cache_set_sid2unixid(
+				&state->non_cached[num_non_cached],
+				&xid);
+
+			num_non_cached += 1;
+		}
+
+		xids[i] = xid;
+	}
+
+	return NT_STATUS_OK;
+}