mongodb/jstests/auth/iteration_count_control.js

// Test SCRAM iterationCount control.
load('./jstests/multiVersion/libs/auth_helpers.js');

var conn = MongoRunner.runMongod({auth: ''});

var testIterationCountControl = function(){
    var adminDB = conn.getDB('admin');
    adminDB.createUser({user: 'user1', pwd: 'pass',
                        roles: jsTest.adminUserRoles});
    assert(adminDB.auth({user: 'user1', pwd: 'pass'}));

    var userDoc = getUserDoc(adminDB, 'user1');
    assert.eq(10000, userDoc.credentials['SCRAM-SHA-1'].iterationCount);

    // Changing iterationCount should not affect existing users.
    assert.commandWorked(adminDB.runCommand({setParameter: 1,
                                             scramIterationCount: 5000}));
    userDoc = getUserDoc(adminDB, 'user1');
    assert.eq(10000, userDoc.credentials['SCRAM-SHA-1'].iterationCount);

    // But it should take effect when the user's password is changed.
    adminDB.updateUser('user1', {pwd: 'pass',
                                 roles: jsTest.adminUserRoles});
    userDoc = getUserDoc(adminDB, 'user1');
    assert.eq(5000, userDoc.credentials['SCRAM-SHA-1'].iterationCount);

    // Test invalid values for iterationCount. 5000 is the minimum value.
    assert.commandFailed(adminDB.runCommand({setParameter: 1,
                                             scramIterationCount: 4999}));
    assert.commandFailed(adminDB.runCommand({setParameter: 1,
                                             scramIterationCount: -5000}));
    assert.commandFailed(adminDB.runCommand(
        {setParameter: 1, scramIterationCount: 12345678901234567890}));
}

testIterationCountControl();
MongoRunner.stopMongod(conn);