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diff --git a/src/mongo/db/kill_sessions.h b/src/mongo/db/kill_sessions.h
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+/**
+ * Copyright (C) 2017 MongoDB Inc.
+ *
+ * This program is free software: you can redistribute it and/or  modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * As a special exception, the copyright holders give permission to link the
+ * code of portions of this program with the OpenSSL library under certain
+ * conditions as described in each individual source file and distribute
+ * linked combinations including the program with the OpenSSL library. You
+ * must comply with the GNU Affero General Public License in all respects
+ * for all of the code used other than as permitted herein. If you modify
+ * file(s) with this exception, you may extend this exception to your
+ * version of the file(s), but you are not obligated to do so. If you do not
+ * wish to do so, delete this exception statement from your version. If you
+ * delete this exception statement from all source files in the program,
+ * then also delete it in the license file.
+ */
+
+#pragma once
+
+#include <tuple>
+
+#include "mongo/db/auth/role_name.h"
+#include "mongo/db/auth/user_name.h"
+#include "mongo/db/kill_sessions_gen.h"
+#include "mongo/db/logical_session_id.h"
+
+namespace mongo {
+
+class OperationContext;
+class ServiceContext;
+
+struct KillAllSessionsByPatternHash {
+    std::size_t operator()(const KillAllSessionsByPattern& pattern) const {
+        if (pattern.getLsid()) {
+            return lsidHasher(*pattern.getLsid());
+        } else if (pattern.getUid()) {
+            return uidHasher(*pattern.getUid());
+        }
+
+        // fall through for killAll
+        return 0;
+    }
+
+    LogicalSessionIdHash lsidHasher;
+    SHA256Block::Hash uidHasher;
+};
+
+/**
+ * Patterns are specifically equal if they differ only by impersonate data.
+ */
+inline bool operator==(const KillAllSessionsByPattern& lhs, const KillAllSessionsByPattern& rhs) {
+    auto makeEqualityLens = [](const auto& pattern) {
+        return std::tie(pattern.getLsid(), pattern.getUid());
+    };
+
+    return makeEqualityLens(lhs) == makeEqualityLens(rhs);
+}
+
+inline bool operator!=(const KillAllSessionsByPattern& lhs, const KillAllSessionsByPattern& rhs) {
+    return !(lhs == rhs);
+}
+
+using KillAllSessionsByPatternSet =
+    stdx::unordered_set<KillAllSessionsByPattern, KillAllSessionsByPatternHash>;
+
+std::tuple<std::vector<UserName>, std::vector<RoleName>> getKillAllSessionsByPatternImpersonateData(
+    const KillAllSessionsByPattern& pattern);
+
+/**
+ * Note: All three of the below makeKillAllSessionsByPattern helpers take opCtx to inline the
+ * required impersonate data
+ */
+
+/**
+ * Constructs a kill sessions pattern which kills all sessions
+ */
+KillAllSessionsByPattern makeKillAllSessionsByPattern(OperationContext* opCtx);
+
+/**
+ * Constructs a kill sessions pattern for a particular user
+ */
+KillAllSessionsByPattern makeKillAllSessionsByPattern(OperationContext* opCtx,
+                                                      const KillAllSessionsUser& user);
+
+/**
+ * Constructs a kill sessions pattern for a particular logical session
+ */
+KillAllSessionsByPattern makeKillAllSessionsByPattern(OperationContext* opCtx,
+                                                      const LogicalSessionId& lsid);
+
+}  // namespace mongo