(function() {
'use strict';

// SERVER-8623: Test that renameCollection can't be used to bypass auth checks on system
// namespaces
const conn = MongoRunner.runMongod({auth: ""});

const adminDB = conn.getDB("admin");
const configDB = conn.getDB("config");
const localDB = conn.getDB("local");
const CodeUnauthorized = 13;

const backdoorUserDoc = {
    user: 'backdoor',
    db: 'admin',
    pwd: 'hashed',
    roles: ['root']
};

adminDB.createUser({user: 'userAdmin', pwd: 'password', roles: ['userAdminAnyDatabase']});

adminDB.auth('userAdmin', 'password');
adminDB.createUser({user: 'readWriteAdmin', pwd: 'password', roles: ['readWriteAnyDatabase']});
adminDB.createUser({
    user: 'readWriteAndUserAdmin',
    pwd: 'password',
    roles: ['readWriteAnyDatabase', 'userAdminAnyDatabase']
});
adminDB.createUser({user: 'root', pwd: 'password', roles: ['root']});
adminDB.createUser({user: 'rootier', pwd: 'password', roles: ['__system']});
adminDB.logout();

jsTestLog("Test that a readWrite user can't rename system.profile to something they can read");
adminDB.auth('readWriteAdmin', 'password');
var res = adminDB.system.profile.renameCollection("profile");
assert.eq(0, res.ok);
assert.eq(CodeUnauthorized, res.code);

jsTestLog("Test that a readWrite user can't rename system.users to something they can read");
res = adminDB.system.users.renameCollection("users");
assert.eq(0, res.ok);
assert.eq(CodeUnauthorized, res.code);
assert.eq(0, adminDB.users.count());

jsTestLog("Test that a readWrite user can't use renameCollection to override system.users");
adminDB.users.insert(backdoorUserDoc);
res = adminDB.users.renameCollection("system.users", true);
assert.eq(0, res.ok);
assert.eq(CodeUnauthorized, res.code);
adminDB.users.drop();

jsTestLog("Test that a userAdmin can't rename system.users without readWrite");
adminDB.logout();
adminDB.auth('userAdmin', 'password');
res = adminDB.system.users.renameCollection("users");
assert.eq(0, res.ok);
assert.eq(CodeUnauthorized, res.code);
assert.eq(5, adminDB.system.users.count());

adminDB.auth('readWriteAndUserAdmin', 'password');
assert.eq(0, adminDB.users.count());

jsTestLog("Test that even with userAdmin AND dbAdmin you CANNOT rename to/from system.users");
res = adminDB.system.users.renameCollection("users");
assert.eq(0, res.ok);
assert.eq(CodeUnauthorized, res.code);
assert.eq(5, adminDB.system.users.count());

adminDB.users.drop();
adminDB.users.insert(backdoorUserDoc);
res = adminDB.users.renameCollection("system.users");
assert.eq(0, res.ok);
assert.eq(CodeUnauthorized, res.code);

assert.eq(null, adminDB.system.users.findOne({user: backdoorUserDoc.user}));
assert.neq(null, adminDB.system.users.findOne({user: 'userAdmin'}));

adminDB.auth('rootier', 'password');

// Test permissions against the configDB and localDB

// Start with test against inserting to and renaming collections in config and local
// as __system.
assert.commandWorked(configDB.test.insert({'a': 1}));
assert.commandWorked(configDB.test.renameCollection('test2'));

assert.commandWorked(localDB.test.insert({'a': 1}));
assert.commandWorked(localDB.test.renameCollection('test2'));
adminDB.logout();

// Test renaming collection in config with readWriteAnyDatabase
assert(adminDB.auth('readWriteAdmin', 'password'));
res = configDB.test2.insert({'b': 2});
assert.writeError(res, 13, "not authorized on config to execute command");
res = configDB.test2.renameCollection('test');
assert.eq(0, res.ok);
assert.eq(CodeUnauthorized, res.code);

// Test renaming collection in local with readWriteAnyDatabase
res = localDB.test2.insert({'b': 2});
assert.writeError(res, 13, "not authorized on config to execute command");
res = localDB.test2.renameCollection('test');
assert.eq(0, res.ok);
assert.eq(CodeUnauthorized, res.code);

// Test renaming system.users collection with __system
assert(adminDB.auth('rootier', 'password'));
jsTestLog("Test that with __system you CAN rename to/from system.users");
res = adminDB.system.users.renameCollection("users", true);
assert.eq(1, res.ok, tojson(res));
// At this point, all the user documents are gone, so further activity may be unauthorized,
// depending on cluster configuration.  So, this is the end of the test.
MongoRunner.stopMongod(conn, {user: 'userAdmin', pwd: 'password'});
})();