import unittest import socket from scapy.layers.inet import IP, ICMP, TCP, UDP from scapy.layers.ipsec import SecurityAssociation from scapy.layers.l2 import Ether, Raw from scapy.layers.inet6 import IPv6, ICMPv6EchoRequest from framework import VppTestCase, VppTestRunner from util import ppp from vpp_papi import VppEnum class IPsecIPv4Params(object): addr_type = socket.AF_INET addr_any = "0.0.0.0" addr_bcast = "255.255.255.255" addr_len = 32 is_ipv6 = 0 def __init__(self): self.remote_tun_if_host = '1.1.1.1' self.scapy_tun_sa_id = 10 self.scapy_tun_spi = 1001 self.vpp_tun_sa_id = 20 self.vpp_tun_spi = 1000 self.scapy_tra_sa_id = 30 self.scapy_tra_spi = 2001 self.vpp_tra_sa_id = 40 self.vpp_tra_spi = 2000 self.auth_algo_vpp_id = (VppEnum.vl_api_ipsec_integ_alg_t. IPSEC_API_INTEG_ALG_SHA1_96) self.auth_algo = 'HMAC-SHA1-96' # scapy name self.auth_key = 'C91KUR9GYMm5GfkEvNjX' self.crypt_algo_vpp_id = (VppEnum.vl_api_ipsec_crypto_alg_t. IPSEC_API_CRYPTO_ALG_AES_CBC_128) self.crypt_algo = 'AES-CBC' # scapy name self.crypt_key = 'JPjyOWBeVEQiMe7h' self.flags = 0 self.nat_header = None class IPsecIPv6Params(object): addr_type = socket.AF_INET6 addr_any = "0::0" addr_bcast = "ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff" addr_len = 128 is_ipv6 = 1 def __init__(self): self.remote_tun_if_host = '1111:1111:1111:1111:1111:1111:1111:1111' self.scapy_tun_sa_id = 50 self.scapy_tun_spi = 3001 self.vpp_tun_sa_id = 60 self.vpp_tun_spi = 3000 self.scapy_tra_sa_id = 70 self.scapy_tra_spi = 4001 self.vpp_tra_sa_id = 80 self.vpp_tra_spi = 4000 self.auth_algo_vpp_id = (VppEnum.vl_api_ipsec_integ_alg_t. IPSEC_API_INTEG_ALG_SHA_256_128) self.auth_algo = 'SHA2-256-128' # scapy name self.auth_key = 'C91KUR9GYMm5GfkEvNjX' self.crypt_algo_vpp_id = (VppEnum.vl_api_ipsec_crypto_alg_t. IPSEC_API_CRYPTO_ALG_AES_CBC_256) self.crypt_algo = 'AES-CBC' # scapy name self.crypt_key = 'JPjyOWBeVEQiMe7hJPjyOWBeVEQiMe7h' self.flags = 0 self.nat_header = None class TemplateIpsec(VppTestCase): """ TRANSPORT MODE: ------ encrypt --- |tra_if| <-------> |VPP| ------ decrypt --- TUNNEL MODE: ------ encrypt --- plain --- |tun_if| <------- |VPP| <------ |pg1| ------ --- --- ------ decrypt --- plain --- |tun_if| -------> |VPP| ------> |pg1| ------ --- --- """ def ipsec_select_backend(self): """ empty method to be overloaded when necessary """ pass def setUp(self): super(TemplateIpsec, self).setUp() self.ipv4_params = IPsecIPv4Params() self.ipv6_params = IPsecIPv6Params() self.params = {self.ipv4_params.addr_type: self.ipv4_params, self.ipv6_params.addr_type: self.ipv6_params} self.payload = "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"\ "XXXXXXXXXXXXXXXXXXXXX" self.tun_spd_id = 1 self.tra_spd_id = 2 self.vpp_esp_protocol = (VppEnum.vl_api_ipsec_proto_t. IPSEC_API_PROTO_ESP) self.vpp_ah_protocol = (VppEnum.vl_api_ipsec_proto_t. IPSEC_API_PROTO_AH) self.create_pg_interfaces(range(3)) self.interfaces = list(self.pg_interfaces) for i in self.interfaces: i.admin_up() i.config_ip4() i.resolve_arp() i.config_ip6() i.resolve_ndp() self.ipsec_select_backend() def tearDown(self): super(TemplateIpsec, self).tearDown() for i in self.interfaces: i.admin_down() i.unconfig_ip4() i.unconfig_ip6() if not self.vpp_dead: self.vapi.cli("show hardware") def gen_encrypt_pkts(self, sa, sw_intf, src, dst, count=1): return [Ether(src=sw_intf.remote_mac, dst=sw_intf.local_mac) / sa.encrypt(IP(src=src, dst=dst) / ICMP() / self.payload) for i in range(count)] def gen_encrypt_pkts6(self, sa, sw_intf, src, dst, count=1): return [Ether(src=sw_intf.remote_mac, dst=sw_intf.local_mac) / sa.encrypt(IPv6(src=src, dst=dst) / ICMPv6EchoRequest(id=0, seq=1, data=self.payload)) for i in range(count)] def gen_pkts(self, sw_intf, src, dst, count=1): return [Ether(src=sw_intf.remote_mac, dst=sw_intf.local_mac) / IP(src=src, dst=dst) / ICMP() / self.payload for i in range(count)] def gen_pkts6(self, sw_intf, src, dst, count=1): return [Ether(src=sw_intf.remote_mac, dst=sw_intf.local_mac) / IPv6(src=src, dst=dst) / ICMPv6EchoRequest(id=0, seq=1, data=self.payload) for i in range(count)] def configure_sa_tun(self, params): ip_class_by_addr_type = {socket.AF_INET: IP, socket.AF_INET6: IPv6} scapy_tun_sa = SecurityAssociation( self.encryption_type, spi=params.vpp_tun_spi, crypt_algo=params.crypt_algo, crypt_key=params.crypt_key, auth_algo=params.auth_algo, auth_key=params.auth_key, tunnel_header=ip_class_by_addr_type[params.addr_type]( src=self.tun_if.remote_addr[params.addr_type], dst=self.tun_if.local_addr[params.addr_type]), nat_t_header=params.nat_header) vpp_tun_sa = SecurityAssociation( self.encryption_type, spi=params.scapy_tun_spi, crypt_algo=params.crypt_algo, crypt_key=params.crypt_key, auth_algo=params.auth_algo, auth_key=params.auth_key, tunnel_header=ip_class_by_addr_type[params.addr_type]( dst=self.tun_if.remote_addr[params.addr_type], src=self.tun_if.local_addr[params.addr_type]), nat_t_header=params.nat_header) return vpp_tun_sa, scapy_tun_sa def configure_sa_tra(self, params): params.scapy_tra_sa = SecurityAssociation( self.encryption_type, spi=params.vpp_tra_spi, crypt_algo=params.crypt_algo, crypt_key=params.crypt_key, auth_algo=params.auth_algo, auth_key=params.auth_key, nat_t_header=params.nat_header) params.vpp_tra_sa = SecurityAssociation( self.encryption_type, spi=params.scapy_tra_spi, crypt_algo=params.crypt_algo, crypt_key=params.crypt_key, auth_algo=params.auth_algo, auth_key=params.auth_key, nat_t_header=params.nat_header) class IpsecTcpTests(object): def test_tcp_checksum(self): """ verify checksum correctness for vpp generated packets """ self.vapi.cli("test http server") p = self.params[socket.AF_INET] vpp_tun_sa, scapy_tun_sa = self.configure_sa_tun(p) send = (Ether(src=self.tun_if.remote_mac, dst=self.tun_if.local_mac) / scapy_tun_sa.encrypt(IP(src=p.remote_tun_if_host, dst=self.tun_if.local_ip4) / TCP(flags='S', dport=80))) self.logger.debug(ppp("Sending packet:", send)) recv = self.send_and_expect(self.tun_if, [send], self.tun_if) recv = recv[0] decrypted = vpp_tun_sa.decrypt(recv[IP]) self.assert_packet_checksums_valid(decrypted) class IpsecTra4Tests(object): def test_tra_anti_replay(self, count=1): """ ipsec v4 transport anti-reply test """ p = self.params[socket.AF_INET] # fire in a packet with seq number 1 pkt = (Ether(src=self.tra_if.remote_mac, dst=self.tra_if.local_mac) / p.scapy_tra_sa.encrypt(IP(src=self.tra_if.remote_ip4, dst=self.tra_if.local_ip4) / ICMP(), seq_num=1)) recv_pkts = self.send_and_expect(self.tra_if, [pkt], self.tra_if) # now move the window over to 235 pkt = (Ether(src=self.tra_if.remote_mac, dst=self.tra_if.local_mac) / p.scapy_tra_sa.encrypt(IP(src=self.tra_if.remote_ip4, dst=self.tra_if.local_ip4) / ICMP(), seq_num=235)) recv_pkts = self.send_and_expect(self.tra_if, [pkt], self.tra_if) # the window size is 64 packets # in window are still accepted pkt = (Ether(src=self.tra_if.remote_mac, dst=self.tra_if.local_mac) / p.scapy_tra_sa.encrypt(IP(src=self.tra_if.remote_ip4, dst=self.tra_if.local_ip4) / ICMP(), seq_num=172)) recv_pkts = self.send_and_expect(self.tra_if, [pkt], self.tra_if) # out of window are dropped pkt = (Ether(src=self.tra_if.remote_mac, dst=self.tra_if.local_mac) / p.scapy_tra_sa.encrypt(IP(src=self.tra_if.remote_ip4, dst=self.tra_if.local_ip4) / ICMP(), seq_num=17)) self.send_and_assert_no_replies(self.tra_if, pkt * 17) self.assert_packet_counter_equal( '/err/%s/SA replayed packet' % self.tra4_decrypt_node_name, 17) # a packet that does not decrypt does not move the window forward bogus_sa = SecurityAssociation(self.encryption_type, p.vpp_tra_spi) pkt = (Ether(src=self.tra_if.remote_mac, dst=self.tra_if.local_mac) / bogus_sa.encrypt(IP(src=self.tra_if.remote_ip4, dst=self.tra_if.local_ip4) / ICMP(), seq_num=350)) self.send_and_assert_no_replies(self.tra_if, pkt * 17) self.assert_packet_counter_equal( '/err/%s/Integrity check failed' % self.tra4_decrypt_node_name, 17) # which we can determine since this packet is still in the window pkt = (Ether(src=self.tra_if.remote_mac, dst=self.tra_if.local_mac) / p.scapy_tra_sa.encrypt(IP(src=self.tra_if.remote_ip4, dst=self.tra_if.local_ip4) / ICMP(), seq_num=234)) self.send_and_expect(self.tra_if, [pkt], self.tra_if) # move the security-associations seq number on to the last we used p.scapy_tra_sa.seq_num = 351 p.vpp_tra_sa.seq_num = 351 def test_tra_basic(self, count=1): """ ipsec v4 transport basic test """ self.vapi.cli("clear errors") try: p = self.params[socket.AF_INET] send_pkts = self.gen_encrypt_pkts(p.scapy_tra_sa, self.tra_if, src=self.tra_if.remote_ip4, dst=self.tra_if.local_ip4, count=count) recv_pkts = self.send_and_expect(self.tra_if, send_pkts, self.tra_if) for rx in recv_pkts: try: decrypted = p.vpp_tra_sa.decrypt(rx[IP]) self.assert_packet_checksums_valid(decrypted) except: self.logger.debug(ppp("Unexpected packet:", rx)) raise finally: self.logger.info(self.vapi.ppcli("show error")) self.logger.info(self.vapi.ppcli("show ipsec")) pkts = p.tra_sa_in.get_stats()['packets'] self.assertEqual(pkts, count, "incorrect SA in counts: expected %d != %d" % (count, pkts)) pkts = p.tra_sa_out.get_stats()['packets'] self.assertEqual(pkts, count, "incorrect SA out counts: expected %d != %d" % (count, pkts)) self.assert_packet_counter_equal(self.tra4_encrypt_node_name, count) self.assert_packet_counter_equal(self.tra4_decrypt_node_name, count) def test_tra_burst(self): """ ipsec v4 transport burst test """ self.test_tra_basic(count=257) class IpsecTra6Tests(object): def test_tra_basic6(self, count=1): """ ipsec v6 transport basic test """ self.vapi.cli("clear errors") try: p = self.params[socket.AF_INET6] send_pkts = self.gen_encrypt_pkts6(p.scapy_tra_sa, self.tra_if, src=self.tra_if.remote_ip6, dst=self.tra_if.local_ip6, count=count) recv_pkts = self.send_and_expect(self.tra_if, send_pkts, self.tra_if) for rx in recv_pkts: try: decrypted = p.vpp_tra_sa.decrypt(rx[IPv6]) self.assert_packet_checksums_valid(decrypted) except: self.logger.debug(ppp("Unexpected packet:", rx)) raise finally: self.logger.info(self.vapi.ppcli("show error")) self.logger.info(self.vapi.ppcli("show ipsec")) pkts = p.tra_sa_in.get_stats()['packets'] self.assertEqual(pkts, count, "incorrect SA in counts: expected %d != %d" % (count, pkts)) pkts = p.tra_sa_out.get_stats()['packets'] self.assertEqual(pkts, count, "incorrect SA out counts: expected %d != %d" % (count, pkts)) self.assert_packet_counter_equal(self.tra6_encrypt_node_name, count) self.assert_packet_counter_equal(self.tra6_decrypt_node_name, count) def test_tra_burst6(self): """ ipsec v6 transport burst test """ self.test_tra_basic6(count=257) class IpsecTra46Tests(IpsecTra4Tests, IpsecTra6Tests): pass class IpsecTun4Tests(object): def test_tun_basic44(self, count=1): """ ipsec 4o4 tunnel basic test """ self.vapi.cli("clear errors") try: p = self.params[socket.AF_INET] vpp_tun_sa, scapy_tun_sa = self.configure_sa_tun(p) send_pkts = self.gen_encrypt_pkts(scapy_tun_sa, self.tun_if, src=p.remote_tun_if_host, dst=self.pg1.remote_ip4, count=count) recv_pkts = self.send_and_expect(self.tun_if, send_pkts, self.pg1) for recv_pkt in recv_pkts: self.assert_equal(recv_pkt[IP].src, p.remote_tun_if_host) self.assert_equal(recv_pkt[IP].dst, self.pg1.remote_ip4) self.assert_packet_checksums_valid(recv_pkt) send_pkts = self.gen_pkts(self.pg1, src=self.pg1.remote_ip4, dst=p.remote_tun_if_host, count=count) recv_pkts = self.send_and_expect(self.pg1, send_pkts, self.tun_if) for recv_pkt in recv_pkts: try: decrypt_pkt = vpp_tun_sa.decrypt(recv_pkt[IP]) if not decrypt_pkt.haslayer(IP): decrypt_pkt = IP(decrypt_pkt[Raw].load) self.assert_equal(decrypt_pkt.src, self.pg1.remote_ip4) self.assert_equal(decrypt_pkt.dst, p.remote_tun_if_host) self.assert_packet_checksums_valid(decrypt_pkt) except: self.logger.debug(ppp("Unexpected packet:", recv_pkt)) try: self.logger.debug( ppp("Decrypted packet:", decrypt_pkt)) except: pass raise finally: self.logger.info(self.vapi.ppcli("show error")) self.logger.info(self.vapi.ppcli("show ipsec")) if (hasattr(p, "spd_policy_in_any")): pkts = p.spd_policy_in_any.get_stats()['packets'] self.assertEqual(pkts, count, "incorrect SPD any policy: expected %d != %d" % (count, pkts)) if (hasattr(p, "tun_sa_in")): pkts = p.tun_sa_in.get_stats()['packets'] self.assertEqual(pkts, count, "incorrect SA in counts: expected %d != %d" % (count, pkts)) pkts = p.tun_sa_out.get_stats()['packets'] self.assertEqual(pkts, count, "incorrect SA out counts: expected %d != %d" % (count, pkts)) self.assert_packet_counter_equal(self.tun4_encrypt_node_name, count) self.assert_packet_counter_equal(self.tun4_decrypt_node_name, count) def test_tun_burst44(self): """ ipsec 4o4 tunnel burst test """ self.test_tun_basic44(count=257) class IpsecTun6Tests(object): def test_tun_basic66(self, count=1): """ ipsec 6o6 tunnel basic test """ self.vapi.cli("clear errors") try: p = self.params[socket.AF_INET6] vpp_tun_sa, scapy_tun_sa = self.configure_sa_tun(p) send_pkts = self.gen_encrypt_pkts6(scapy_tun_sa, self.tun_if, src=p.remote_tun_if_host, dst=self.pg1.remote_ip6, count=count) recv_pkts = self.send_and_expect(self.tun_if, send_pkts, self.pg1) for recv_pkt in recv_pkts: self.assert_equal(recv_pkt[IPv6].src, p.remote_tun_if_host) self.assert_equal(recv_pkt[IPv6].dst, self.pg1.remote_ip6) self.assert_packet_checksums_valid(recv_pkt) send_pkts = self.gen_pkts6(self.pg1, src=self.pg1.remote_ip6, dst=p.remote_tun_if_host, count=count) recv_pkts = self.send_and_expect(self.pg1, send_pkts, self.tun_if) for recv_pkt in recv_pkts: try: decrypt_pkt = vpp_tun_sa.decrypt(recv_pkt[IPv6]) if not decrypt_pkt.haslayer(IPv6): decrypt_pkt = IPv6(decrypt_pkt[Raw].load) self.assert_equal(decrypt_pkt.src, self.pg1.remote_ip6) self.assert_equal(decrypt_pkt.dst, p.remote_tun_if_host) self.assert_packet_checksums_valid(decrypt_pkt) except: self.logger.debug(ppp("Unexpected packet:", recv_pkt)) try: self.logger.debug( ppp("Decrypted packet:", decrypt_pkt)) except: pass raise finally: self.logger.info(self.vapi.ppcli("show error")) self.logger.info(self.vapi.ppcli("show ipsec")) if (hasattr(p, "tun_sa_in")): pkts = p.tun_sa_in.get_stats()['packets'] self.assertEqual(pkts, count, "incorrect SA in counts: expected %d != %d" % (count, pkts)) pkts = p.tun_sa_out.get_stats()['packets'] self.assertEqual(pkts, count, "incorrect SA out counts: expected %d != %d" % (count, pkts)) self.assert_packet_counter_equal(self.tun6_encrypt_node_name, count) self.assert_packet_counter_equal(self.tun6_decrypt_node_name, count) def test_tun_burst66(self): """ ipsec 6o6 tunnel burst test """ self.test_tun_basic66(count=257) class IpsecTun46Tests(IpsecTun4Tests, IpsecTun6Tests): pass if __name__ == '__main__': unittest.main(testRunner=VppTestRunner)