s3: Add wb_lookupsids

Signed-off-by: Jeremy Allison <jra@samba.org>

2 files changed, 609 insertions, 0 deletions

diff --git a/source3/winbindd/wb_lookupsids.c b/source3/winbindd/wb_lookupsids.c
new file mode 100644
index 0000000000..05601ad192
--- /dev/null
+++ b/source3/winbindd/wb_lookupsids.c
@@ -0,0 +1,601 @@
+/*
+   Unix SMB/CIFS implementation.
+   async lookupsids
+   Copyright (C) Volker Lendecke 2011
+
+   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 "librpc/gen_ndr/ndr_wbint_c.h"
+#include "../libcli/security/security.h"
+#include "passdb/machine_sid.h"
+
+struct wb_lookupsids_domain {
+	struct dom_sid sid;
+	struct winbindd_domain *domain;
+
+	/*
+	 * Array of sids to be passed into wbint_LookupSids. Preallocated with
+	 * num_sids.
+	 */
+	struct lsa_SidArray sids;
+
+	/*
+	 * Indexes into wb_lookupsids_state->sids and thus
+	 * wb_lookupsids_state->res_names. Preallocated with num_sids.
+	 */
+	uint32_t *sid_indexes;
+};
+
+struct wb_translated_name {
+	const char *domain_name;
+	const char *name;
+	enum lsa_SidType type;
+};
+
+static struct wb_lookupsids_domain *wb_lookupsids_get_domain(
+	const struct dom_sid *sid, TALLOC_CTX *mem_ctx,
+	struct wb_lookupsids_domain **domains, uint32_t num_sids);
+
+struct wb_lookupsids_state {
+	struct tevent_context *ev;
+
+	/*
+	 * SIDs passed in
+	 */
+	struct dom_sid *sids;
+	uint32_t num_sids;
+
+	/*
+	 * The domains we're using for bulk lookup via wbint_LookupRids or
+	 * wbint_LookupSids. We expect very few domains, so we do a
+	 * talloc_realloc and rely on talloc_array_length.
+	 */
+	struct wb_lookupsids_domain *domains;
+	uint32_t domains_done;
+
+	/*
+	 * These SIDs are looked up individually via
+	 * wbint_LookupSid. Preallocated with num_sids.
+	 */
+	uint32_t *single_sids;
+	uint32_t num_single_sids;
+	uint32_t single_sids_done;
+
+	/*
+	 * Intermediate store for wbint_LookupRids to passdb. These are
+	 * spliced into res_domains/res_names in wb_lookupsids_move_name.
+	 */
+	struct wbint_RidArray rids;
+	const char *domain_name;
+	struct wbint_Principals rid_names;
+
+	/*
+	 * Intermediate results for wbint_LookupSids. These results are
+	 * spliced into res_domains/res_names in wb_lookupsids_move_name.
+	 */
+	struct lsa_RefDomainList tmp_domains;
+	struct lsa_TransNameArray tmp_names;
+
+	/*
+	 * Results
+	 */
+	struct lsa_RefDomainList *res_domains;
+	/*
+	 * Indexed as "sids" in this structure
+	 */
+	struct lsa_TransNameArray *res_names;
+};
+
+static bool wb_lookupsids_next(struct tevent_req *req,
+			       struct wb_lookupsids_state *state);
+static void wb_lookupsids_single_done(struct tevent_req *subreq);
+static void wb_lookupsids_lookuprids_done(struct tevent_req *subreq);
+static void wb_lookupsids_done(struct tevent_req *subreq);
+
+struct tevent_req *wb_lookupsids_send(TALLOC_CTX *mem_ctx,
+				      struct tevent_context *ev,
+				      struct dom_sid *sids,
+				      uint32_t num_sids)
+{
+	struct tevent_req *req;
+	struct wb_lookupsids_state *state;
+	uint32_t i;
+
+	req = tevent_req_create(mem_ctx, &state, struct wb_lookupsids_state);
+	if (req == NULL) {
+		return NULL;
+	}
+	state->ev = ev;
+	state->sids = sids;
+	state->num_sids = num_sids;
+
+	if (num_sids == 0) {
+		tevent_req_done(req);
+		return tevent_req_post(req, ev);
+	}
+
+	state->single_sids = TALLOC_ARRAY(state, uint32_t, num_sids);
+	if (tevent_req_nomem(state->single_sids, req)) {
+		return tevent_req_post(req, ev);
+	}
+
+	state->res_domains = TALLOC_ZERO_P(state, struct lsa_RefDomainList);
+	if (tevent_req_nomem(state->res_domains, req)) {
+		return tevent_req_post(req, ev);
+	}
+	state->res_domains->domains = TALLOC_ARRAY(
+		state->res_domains, struct lsa_DomainInfo, num_sids);
+	if (tevent_req_nomem(state->res_domains->domains, req)) {
+		return tevent_req_post(req, ev);
+	}
+
+	state->res_names = TALLOC_ZERO_P(state, struct lsa_TransNameArray);
+	if (tevent_req_nomem(state->res_names, req)) {
+		return tevent_req_post(req, ev);
+	}
+	state->res_names->names = TALLOC_ARRAY(
+		state->res_names, struct lsa_TranslatedName, num_sids);
+	if (tevent_req_nomem(state->res_names->names, req)) {
+		return tevent_req_post(req, ev);
+	}
+
+	for (i=0; i<num_sids; i++) {
+		struct wb_lookupsids_domain *d;
+
+		d = wb_lookupsids_get_domain(&sids[i], state, &state->domains,
+					     num_sids);
+		if (d != NULL) {
+			d->sids.sids[d->sids.num_sids].sid = &sids[i];
+			d->sid_indexes[d->sids.num_sids] = i;
+			d->sids.num_sids += 1;
+		} else {
+			state->single_sids[state->num_single_sids] = i;
+			state->num_single_sids += 1;
+		}
+	}
+
+	if (!wb_lookupsids_next(req, state)) {
+		return tevent_req_post(req, ev);
+	}
+	return req;
+}
+
+static bool wb_lookupsids_next(struct tevent_req *req,
+			       struct wb_lookupsids_state *state)
+{
+	struct tevent_req *subreq;
+
+	if (state->domains_done < talloc_array_length(state->domains)) {
+		struct wb_lookupsids_domain *d;
+		uint32_t i;
+
+		d = &state->domains[state->domains_done];
+
+		if (sid_check_is_domain(&d->sid)) {
+			state->rids.num_rids = d->sids.num_sids;
+			state->rids.rids = TALLOC_ARRAY(state, uint32_t,
+							state->rids.num_rids);
+			if (tevent_req_nomem(state->rids.rids, req)) {
+				return false;
+			}
+			for (i=0; i<state->rids.num_rids; i++) {
+				sid_peek_rid(d->sids.sids[i].sid,
+					     &state->rids.rids[i]);
+			}
+			subreq = dcerpc_wbint_LookupRids_send(
+				state, state->ev, dom_child_handle(d->domain),
+				&state->rids, &state->domain_name,
+				&state->rid_names);
+			if (tevent_req_nomem(subreq, req)) {
+				return false;
+			}
+			tevent_req_set_callback(
+				subreq, wb_lookupsids_lookuprids_done, req);
+			return true;
+		}
+
+		subreq = dcerpc_wbint_LookupSids_send(
+			state, state->ev, dom_child_handle(d->domain),
+			&d->sids, &state->tmp_domains,	&state->tmp_names);
+		if (tevent_req_nomem(subreq, req)) {
+			return false;
+		}
+		tevent_req_set_callback(subreq, wb_lookupsids_done, req);
+		return true;
+	}
+
+	if (state->single_sids_done < state->num_single_sids) {
+		uint32_t sid_idx;
+		const struct dom_sid *sid;
+
+		sid_idx = state->single_sids[state->single_sids_done];
+		sid = &state->sids[sid_idx];
+
+		subreq = wb_lookupsid_send(state, state->ev, sid);
+		if (tevent_req_nomem(subreq, req)) {
+			return false;
+		}
+		tevent_req_set_callback(subreq, wb_lookupsids_single_done,
+					req);
+		return true;
+	}
+
+	tevent_req_done(req);
+	return false;
+}
+
+/*
+ * Decide whether to do bulk lookupsids. We have optimizations for
+ * passdb via lookuprids and to remote DCs via lookupsids.
+ */
+
+static bool wb_lookupsids_bulk(const struct dom_sid *sid)
+{
+	if (sid->num_auths != 5) {
+		/*
+		 * Only do "S-1-5-21-x-y-z-rid" domains via bulk
+		 * lookup
+		 */
+		DEBUG(10, ("No bulk setup for SID %s with %d subauths\n",
+			   sid_string_dbg(sid), sid->num_auths));
+		return false;
+	}
+
+	if (sid_check_is_in_our_domain(sid)) {
+		/*
+		 * Passdb lookup via lookuprids
+		 */
+		DEBUG(10, ("%s is in our domain\n", sid_string_tos(sid)));
+		return true;
+	}
+
+	if ((lp_server_role() == ROLE_DOMAIN_PDC) ||
+	    (lp_server_role() == ROLE_DOMAIN_BDC)) {
+		/*
+		 * Bulk lookups to trusted DCs
+		 */
+		return (find_domain_from_sid_noinit(sid) != NULL);
+	}
+
+	if (lp_server_role() != ROLE_DOMAIN_MEMBER) {
+		/*
+		 * Don't do bulk lookups as standalone, the only bulk
+		 * lookup left is for domain members.
+		 */
+		return false;
+	}
+
+	if (sid_check_is_in_unix_groups(sid) ||
+	    sid_check_is_unix_groups(sid) ||
+	    sid_check_is_in_unix_users(sid) ||
+	    sid_check_is_unix_users(sid) ||
+	    sid_check_is_in_builtin(sid) ||
+	    sid_check_is_builtin(sid)) {
+		/*
+		 * These are locally done piece by piece anyway, no
+		 * need for bulk optimizations.
+		 */
+		return false;
+	}
+
+	/*
+	 * All other SIDs are sent to the DC we're connected to as
+	 * member via a single lsa_lookupsids call.
+	 */
+	return true;
+}
+
+static struct wb_lookupsids_domain *wb_lookupsids_get_domain(
+	const struct dom_sid *sid, TALLOC_CTX *mem_ctx,
+	struct wb_lookupsids_domain **pdomains, uint32_t num_sids)
+{
+	struct wb_lookupsids_domain *domains, *domain;
+	struct winbindd_domain *wb_domain;
+	uint32_t i, num_domains;
+
+	if (!wb_lookupsids_bulk(sid)) {
+		return NULL;
+	}
+
+	domains = *pdomains;
+	num_domains = talloc_array_length(domains);
+
+	for (i=0; i<num_domains; i++) {
+		if (dom_sid_compare_domain(sid, &domains[i].sid) == 0) {
+			return &domains[i];
+		}
+	}
+
+	wb_domain = find_domain_from_sid_noinit(sid);
+	if (wb_domain == NULL) {
+		return NULL;
+	}
+
+	domains = TALLOC_REALLOC_ARRAY(
+		mem_ctx, domains, struct wb_lookupsids_domain, num_domains+1);
+	if (domains == NULL) {
+		return NULL;
+	}
+	*pdomains = domains;
+
+	domain = &domains[num_domains];
+	sid_copy(&domain->sid, sid);
+	sid_split_rid(&domain->sid, NULL);
+	domain->domain = wb_domain;
+
+	domain->sids.sids = TALLOC_ARRAY(domains, struct lsa_SidPtr, num_sids);
+	if (domains->sids.sids == NULL) {
+		goto fail;
+	}
+	domain->sids.num_sids = 0;
+
+	domain->sid_indexes = TALLOC_ARRAY(domains, uint32_t, num_sids);
+	if (domain->sid_indexes == NULL) {
+		TALLOC_FREE(domain->sids.sids);
+		goto fail;
+	}
+	return domain;
+
+fail:
+	/*
+	 * Realloc to the state it was in before
+	 */
+	*pdomains = TALLOC_REALLOC_ARRAY(
+		mem_ctx, domains, struct wb_lookupsids_domain, num_domains);
+	return NULL;
+}
+
+static bool wb_lookupsids_find_dom_idx(struct lsa_DomainInfo *domain,
+				       struct lsa_RefDomainList *list,
+				       uint32_t *idx)
+{
+	uint32_t i;
+	struct lsa_DomainInfo *new_domain;
+
+	for (i=0; i<list->count; i++) {
+		if (sid_equal(domain->sid, list->domains[i].sid)) {
+			*idx = i;
+			return true;
+		}
+	}
+
+	new_domain = &list->domains[list->count];
+
+	new_domain->name.string = talloc_strdup(
+		list->domains, domain->name.string);
+	if (new_domain->name.string == NULL) {
+		return false;
+	}
+
+	new_domain->sid = dom_sid_dup(list->domains, domain->sid);
+	if (new_domain->sid == NULL) {
+		return false;
+	}
+
+	*idx = list->count;
+	list->count += 1;
+	return true;
+}
+
+static bool wb_lookupsids_move_name(struct lsa_RefDomainList *src_domains,
+				    struct lsa_TranslatedName *src_name,
+				    struct lsa_RefDomainList *dst_domains,
+				    struct lsa_TransNameArray *dst_names,
+				    uint32_t dst_name_index)
+{
+	struct lsa_TranslatedName *dst_name;
+	struct lsa_DomainInfo *src_domain;
+	uint32_t src_domain_index, dst_domain_index;
+
+	src_domain_index = src_name->sid_index;
+	src_domain = &src_domains->domains[src_domain_index];
+
+	if (!wb_lookupsids_find_dom_idx(
+		    src_domain, dst_domains, &dst_domain_index)) {
+		return false;
+	}
+
+	dst_name = &dst_names->names[dst_name_index];
+
+	dst_name->sid_type = src_name->sid_type;
+	dst_name->name.string = talloc_move(dst_names->names,
+					    &src_name->name.string);
+	dst_name->sid_index = dst_domain_index;
+	dst_names->count += 1;
+
+	return true;
+}
+
+static void wb_lookupsids_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct wb_lookupsids_state *state = tevent_req_data(
+		req, struct wb_lookupsids_state);
+	struct wb_lookupsids_domain *d;
+	uint32_t i;
+
+	NTSTATUS status, result;
+
+	status = dcerpc_wbint_LookupSids_recv(subreq, state, &result);
+	TALLOC_FREE(subreq);
+	if (tevent_req_nterror(req, status)) {
+		return;
+	}
+
+	/*
+	 * Ignore "result" here. We depend on the individual states in
+	 * the translated names.
+	 */
+
+	d = &state->domains[state->domains_done];
+
+	for (i=0; i<state->tmp_names.count; i++) {
+
+		uint32_t res_sid_index = d->sid_indexes[i];
+
+		if (state->tmp_names.names[i].sid_type == SID_NAME_UNKNOWN) {
+			/*
+			 * Make unknown SIDs go through
+			 * wb_lookupsid. This retries the forest root.
+			 */
+			state->single_sids[state->num_single_sids] =
+				res_sid_index;
+			state->num_single_sids += 1;
+			continue;
+		}
+		if (!wb_lookupsids_move_name(
+			    &state->tmp_domains, &state->tmp_names.names[i],
+			    state->res_domains, state->res_names,
+			    res_sid_index)) {
+			tevent_req_nomem(NULL, req);
+			return;
+		}
+	}
+	state->domains_done += 1;
+	wb_lookupsids_next(req, state);
+}
+
+static void wb_lookupsids_single_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct wb_lookupsids_state *state = tevent_req_data(
+		req, struct wb_lookupsids_state);
+	const char *domain_name, *name;
+	enum lsa_SidType type;
+	uint32_t res_sid_index;
+	uint32_t src_rid;
+
+	struct dom_sid src_domain_sid;
+	struct lsa_DomainInfo src_domain;
+	struct lsa_RefDomainList src_domains;
+	struct lsa_TranslatedName src_name;
+
+	NTSTATUS status;
+
+	status = wb_lookupsid_recv(subreq, talloc_tos(), &type,
+				   &domain_name, &name);
+	TALLOC_FREE(subreq);
+	if (!NT_STATUS_IS_OK(status)) {
+		type = SID_NAME_UNKNOWN;
+
+		domain_name = talloc_strdup(talloc_tos(), "");
+		if (tevent_req_nomem(domain_name, req)) {
+			return;
+		}
+		name = talloc_strdup(talloc_tos(), "");
+		if (tevent_req_nomem(name, req)) {
+			return;
+		}
+	}
+
+	/*
+	 * Fake up structs for wb_lookupsids_move_name
+	 */
+	res_sid_index = state->single_sids[state->single_sids_done];
+
+	sid_copy(&src_domain_sid, &state->sids[res_sid_index]);
+	sid_split_rid(&src_domain_sid, &src_rid);
+	src_domain.name.string = domain_name;
+	src_domain.sid = &src_domain_sid;
+
+	src_domains.count = 1;
+	src_domains.domains = &src_domain;
+
+	src_name.sid_type = type;
+	src_name.name.string = name;
+	src_name.sid_index = 0;
+
+	if (!wb_lookupsids_move_name(
+		    &src_domains, &src_name,
+		    state->res_domains, state->res_names,
+		    res_sid_index)) {
+		tevent_req_nomem(NULL, req);
+		return;
+	}
+	state->single_sids_done += 1;
+	wb_lookupsids_next(req, state);
+}
+
+static void wb_lookupsids_lookuprids_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct wb_lookupsids_state *state = tevent_req_data(
+		req, struct wb_lookupsids_state);
+	struct dom_sid src_domain_sid;
+	struct lsa_DomainInfo src_domain;
+	struct lsa_RefDomainList src_domains;
+	NTSTATUS status, result;
+	struct wb_lookupsids_domain *d;
+	uint32_t i;
+
+	status = dcerpc_wbint_LookupRids_recv(subreq, state, &result);
+	TALLOC_FREE(subreq);
+	if (tevent_req_nterror(req, status)) {
+		return;
+	}
+
+	d = &state->domains[state->domains_done];
+	sid_copy(&src_domain_sid, get_global_sam_sid());
+	src_domain.name.string = get_global_sam_name();
+	src_domain.sid = &src_domain_sid;
+	src_domains.count = 1;
+	src_domains.domains = &src_domain;
+
+	for (i=0; i<state->rid_names.num_principals; i++) {
+		struct lsa_TranslatedName src_name;
+		uint32_t res_sid_index;
+
+		/*
+		 * Fake up structs for wb_lookupsids_move_name
+		 */
+		res_sid_index = d->sid_indexes[i];
+
+		src_name.sid_type = state->rid_names.principals[i].type;
+		src_name.name.string = state->rid_names.principals[i].name;
+		src_name.sid_index = 0;
+
+		if (!wb_lookupsids_move_name(
+			    &src_domains, &src_name,
+			    state->res_domains, state->res_names,
+			    res_sid_index)) {
+			tevent_req_nomem(NULL, req);
+			return;
+		}
+	}
+
+	state->domains_done += 1;
+	wb_lookupsids_next(req, state);
+}
+
+NTSTATUS wb_lookupsids_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
+			    struct lsa_RefDomainList **domains,
+			    struct lsa_TransNameArray **names)
+{
+	struct wb_lookupsids_state *state = tevent_req_data(
+		req, struct wb_lookupsids_state);
+	NTSTATUS status;
+
+	if (tevent_req_is_nterror(req, &status)) {
+		return status;
+	}
+	*domains = talloc_move(mem_ctx, &state->res_domains);
+	*names = talloc_move(mem_ctx, &state->res_names);
+	return NT_STATUS_OK;
+}
diff --git a/source3/winbindd/winbindd_proto.h b/source3/winbindd/winbindd_proto.h
index d1007f420b..389f8dfb67 100644
--- a/source3/winbindd/winbindd_proto.h
+++ b/source3/winbindd/winbindd_proto.h
@@ -838,6 +838,14 @@ NTSTATUS winbindd_pam_chng_pswd_auth_crap_recv(
 	struct tevent_req *req,
 	struct winbindd_response *response);
 
+struct tevent_req *wb_lookupsids_send(TALLOC_CTX *mem_ctx,
+				      struct tevent_context *ev,
+				      struct dom_sid *sids,
+				      uint32_t num_sids);
+NTSTATUS wb_lookupsids_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
+			    struct lsa_RefDomainList **domains,
+			    struct lsa_TransNameArray **names);
+
 /* The following definitions come from winbindd/winbindd_samr.c  */
 
 NTSTATUS open_internal_samr_conn(TALLOC_CTX *mem_ctx,