#!/usr/bin/env python3
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# Test for CVE-2018-12546, with the broker being stopped to write the persistence file, plus subscriber on different port.
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from mosq_test_helper import *
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import signal
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def write_config(filename, port1, port2, per_listener):
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with open(filename, 'w') as f:
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f.write("per_listener_settings %s\n" % (per_listener))
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f.write("check_retain_source true\n")
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f.write("port %d\n" % (port1))
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f.write("acl_file %s\n" % (filename.replace('.conf', '.acl')))
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f.write("persistence true\n")
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f.write("persistence_file %s\n" % (filename.replace('.conf', '.db')))
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f.write("listener %d\n" % (port2))
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def write_acl_1(filename, username):
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with open(filename, 'w') as f:
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if username is not None:
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f.write('user %s\n' % (username))
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f.write('topic readwrite test/topic\n')
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def write_acl_2(filename, username):
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with open(filename, 'w') as f:
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if username is not None:
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f.write('user %s\n' % (username))
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f.write('topic read test/topic\n')
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def do_test(per_listener, username):
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conf_file = os.path.basename(__file__).replace('.py', '.conf')
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write_config(conf_file, port1, port2, per_listener)
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persistence_file = os.path.basename(__file__).replace('.py', '.db')
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try:
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os.remove(persistence_file)
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except OSError:
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pass
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acl_file = os.path.basename(__file__).replace('.py', '.acl')
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write_acl_1(acl_file, username)
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rc = 1
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keepalive = 60
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connect_packet = mosq_test.gen_connect("retain-check", keepalive=keepalive, username=username)
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connack_packet = mosq_test.gen_connack(rc=0)
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if per_listener == "true":
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u = None
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else:
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# If per listener is false, then the second client will be denied
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# unless we provide a username
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u = username
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connect2_packet = mosq_test.gen_connect("retain-recv", keepalive=keepalive, username=u)
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connack2_packet = mosq_test.gen_connack(rc=0)
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mid = 1
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publish_packet = mosq_test.gen_publish("test/topic", qos=0, payload="retained message", retain=True)
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subscribe_packet = mosq_test.gen_subscribe(mid, "test/topic", 0)
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suback_packet = mosq_test.gen_suback(mid, 0)
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broker = mosq_test.start_broker(filename=os.path.basename(__file__), use_conf=True, port=port1)
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try:
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sock = mosq_test.do_client_connect(connect_packet, connack_packet, port=port1)
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sock.send(publish_packet)
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sock.close()
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sock = mosq_test.do_client_connect(connect2_packet, connack2_packet, port=port2)
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mosq_test.do_send_receive(sock, subscribe_packet, suback_packet, "suback 1")
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if mosq_test.expect_packet(sock, "publish", publish_packet):
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sock.close()
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# Remove "write" ability
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write_acl_2(acl_file, username)
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broker.terminate()
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broker.wait()
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broker = mosq_test.start_broker(filename=os.path.basename(__file__), use_conf=True, port=port1)
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sock = mosq_test.do_client_connect(connect2_packet, connack2_packet, port=port2)
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mosq_test.do_send_receive(sock, subscribe_packet, suback_packet, "suback 2")
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# If we receive the retained message here, it is a failure.
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mosq_test.do_ping(sock)
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rc = 0
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sock.close()
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finally:
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broker.terminate()
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broker.wait()
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os.remove(conf_file)
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os.remove(acl_file)
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os.remove(persistence_file)
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(stdo, stde) = broker.communicate()
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if rc:
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print(stde.decode('utf-8'))
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exit(rc)
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(port1, port2) = mosq_test.get_port(2)
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do_test("true", username=None)
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do_test("true", username="test")
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do_test("false", username=None)
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do_test("false", username="test")
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