rpc_server: Move SID helpers into common

Signed-off-by: Garming Sam <garming@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>

1 files changed, 134 insertions, 0 deletions

diff --git a/source4/rpc_server/common/sid_helper.c b/source4/rpc_server/common/sid_helper.c
new file mode 100644
index 00000000000..698249391ef
--- /dev/null
+++ b/source4/rpc_server/common/sid_helper.c
@@ -0,0 +1,134 @@
+/*
+   Unix SMB/CIFS implementation.
+
+   common sid helper functions
+
+   Copyright (C) Catalyst.NET Ltd 2017
+
+   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 "rpc_server/dcerpc_server.h"
+#include "librpc/gen_ndr/ndr_security.h"
+#include "source4/dsdb/samdb/samdb.h"
+#include "rpc_server/common/sid_helper.h"
+#include "libcli/security/security.h"
+
+/*
+  see if any SIDs in list1 are in list2
+ */
+bool sid_list_match(const struct dom_sid **list1, const struct dom_sid **list2)
+{
+	unsigned int i, j;
+	/* do we ever have enough SIDs here to worry about O(n^2) ? */
+	for (i=0; list1[i]; i++) {
+		for (j=0; list2[j]; j++) {
+			if (dom_sid_equal(list1[i], list2[j])) {
+				return true;
+			}
+		}
+	}
+	return false;
+}
+
+/*
+ * Return an array of SIDs from a ldb_message given an attribute name assumes
+ * the SIDs are in NDR form (with additional sids applied on the end).
+ */
+WERROR samdb_result_sid_array_ndr(struct ldb_context *sam_ctx,
+				  struct ldb_message *msg,
+				  TALLOC_CTX *mem_ctx,
+				  const char *attr,
+					 const struct dom_sid ***sids,
+					 const struct dom_sid **additional_sids,
+					 unsigned int num_additional)
+{
+	struct ldb_message_element *el;
+	unsigned int i, j;
+
+	el = ldb_msg_find_element(msg, attr);
+	if (!el) {
+		*sids = NULL;
+		return WERR_OK;
+	}
+
+	/* Make array long enough for NULL and additional SID */
+	(*sids) = talloc_array(mem_ctx, const struct dom_sid *,
+			       el->num_values + num_additional + 1);
+	W_ERROR_HAVE_NO_MEMORY(*sids);
+
+	for (i=0; i<el->num_values; i++) {
+		enum ndr_err_code ndr_err;
+		struct dom_sid *sid;
+
+		sid = talloc(*sids, struct dom_sid);
+		W_ERROR_HAVE_NO_MEMORY(sid);
+
+		ndr_err = ndr_pull_struct_blob(&el->values[i], sid, sid,
+					       (ndr_pull_flags_fn_t)ndr_pull_dom_sid);
+		if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+			return WERR_INTERNAL_DB_CORRUPTION;
+		}
+		(*sids)[i] = sid;
+	}
+
+	for (j = 0; j < num_additional; j++) {
+		(*sids)[i++] = additional_sids[j];
+	}
+
+	(*sids)[i] = NULL;
+
+	return WERR_OK;
+}
+
+/*
+  return an array of SIDs from a ldb_message given an attribute name
+  assumes the SIDs are in extended DN format
+ */
+WERROR samdb_result_sid_array_dn(struct ldb_context *sam_ctx,
+				 struct ldb_message *msg,
+				 TALLOC_CTX *mem_ctx,
+				 const char *attr,
+				 const struct dom_sid ***sids)
+{
+	struct ldb_message_element *el;
+	unsigned int i;
+
+	el = ldb_msg_find_element(msg, attr);
+	if (!el) {
+		*sids = NULL;
+		return WERR_OK;
+	}
+
+	(*sids) = talloc_array(mem_ctx, const struct dom_sid *, el->num_values + 1);
+	W_ERROR_HAVE_NO_MEMORY(*sids);
+
+	for (i=0; i<el->num_values; i++) {
+		struct ldb_dn *dn = ldb_dn_from_ldb_val(mem_ctx, sam_ctx, &el->values[i]);
+		NTSTATUS status;
+		struct dom_sid *sid;
+
+		sid = talloc(*sids, struct dom_sid);
+		W_ERROR_HAVE_NO_MEMORY(sid);
+		status = dsdb_get_extended_dn_sid(dn, sid, "SID");
+		if (!NT_STATUS_IS_OK(status)) {
+			return WERR_INTERNAL_DB_CORRUPTION;
+		}
+		(*sids)[i] = sid;
+	}
+	(*sids)[i] = NULL;
+
+	return WERR_OK;
+}