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import socket
import unittest
from scapy.layers.inet import IP, ICMP
from scapy.layers.l2 import Ether, Raw
from scapy.layers.ipsec import SecurityAssociation, AH
from framework import VppTestCase, VppTestRunner
class TestIpsecAh(VppTestCase):
"""
Basic test for IPSEC using AH transport and Tunnel mode
Below 4 cases are covered as part of this test
1) ipsec ah v4 transport basic test - IPv4 Transport mode
scenario using HMAC-SHA1-96 intergrity algo
2) ipsec ah v4 transport burst test
Above test for 257 pkts
3) ipsec ah 4o4 tunnel basic test - IPv4 Tunnel mode
scenario using HMAC-SHA1-96 intergrity algo
4) ipsec ah 4o4 tunnel burst test
Above test for 257 pkts
TRANSPORT MODE:
--- encrypt ---
|pg2| <-------> |VPP|
--- decrypt ---
TUNNEL MODE:
--- encrypt --- plain ---
|pg0| -------> |VPP| ------> |pg1|
--- --- ---
--- decrypt --- plain ---
|pg0| <------- |VPP| <------ |pg1|
--- --- ---
Note : IPv6 is not covered
"""
remote_pg0_lb_addr = '1.1.1.1'
remote_pg1_lb_addr = '2.2.2.2'
@classmethod
def setUpClass(cls):
super(TestIpsecAh, cls).setUpClass()
try:
cls.create_pg_interfaces(range(3))
cls.interfaces = list(cls.pg_interfaces)
for i in cls.interfaces:
i.admin_up()
i.config_ip4()
i.resolve_arp()
cls.logger.info(cls.vapi.ppcli("show int addr"))
cls.configAhTra()
cls.logger.info(cls.vapi.ppcli("show ipsec"))
cls.configAhTun()
cls.logger.info(cls.vapi.ppcli("show ipsec"))
except Exception:
super(TestIpsecAh, cls).tearDownClass()
raise
@classmethod
def configAhTun(cls):
try:
spd_id = 1
remote_sa_id = 10
local_sa_id = 20
remote_tun_spi = 1001
local_tun_spi = 1000
src4 = socket.inet_pton(socket.AF_INET, cls.remote_pg0_lb_addr)
cls.vapi.ip_add_del_route(src4, 32, cls.pg0.remote_ip4n)
dst4 = socket.inet_pton(socket.AF_INET, cls.remote_pg1_lb_addr)
cls.vapi.ip_add_del_route(dst4, 32, cls.pg1.remote_ip4n)
cls.vapi.ipsec_sad_add_del_entry(
remote_sa_id,
remote_tun_spi,
cls.pg0.local_ip4n,
cls.pg0.remote_ip4n,
integrity_key_length=20)
cls.vapi.ipsec_sad_add_del_entry(
local_sa_id,
local_tun_spi,
cls.pg0.remote_ip4n,
cls.pg0.local_ip4n,
integrity_key_length=20)
cls.vapi.ipsec_spd_add_del(spd_id)
cls.vapi.ipsec_interface_add_del_spd(spd_id, cls.pg0.sw_if_index)
l_startaddr = r_startaddr = socket.inet_pton(
socket.AF_INET, "0.0.0.0")
l_stopaddr = r_stopaddr = socket.inet_pton(
socket.AF_INET, "255.255.255.255")
cls.vapi.ipsec_spd_add_del_entry(
spd_id,
l_startaddr,
l_stopaddr,
r_startaddr,
r_stopaddr,
protocol=socket.IPPROTO_AH)
cls.vapi.ipsec_spd_add_del_entry(
spd_id,
l_startaddr,
l_stopaddr,
r_startaddr,
r_stopaddr,
protocol=socket.IPPROTO_AH,
is_outbound=0)
l_startaddr = l_stopaddr = socket.inet_pton(
socket.AF_INET, cls.remote_pg0_lb_addr)
r_startaddr = r_stopaddr = socket.inet_pton(
socket.AF_INET, cls.remote_pg1_lb_addr)
cls.vapi.ipsec_spd_add_del_entry(
spd_id,
l_startaddr,
l_stopaddr,
r_startaddr,
r_stopaddr,
priority=10,
policy=3,
is_outbound=0,
sa_id=local_sa_id)
cls.vapi.ipsec_spd_add_del_entry(
spd_id,
r_startaddr,
r_stopaddr,
l_startaddr,
l_stopaddr,
priority=10,
policy=3,
sa_id=remote_sa_id)
except Exception:
raise
@classmethod
def configAhTra(cls):
try:
spd_id = 2
remote_sa_id = 30
local_sa_id = 40
remote_tra_spi = 2001
local_tra_spi = 2000
cls.vapi.ipsec_sad_add_del_entry(
remote_sa_id,
remote_tra_spi,
integrity_key_length=20,
is_tunnel=0)
cls.vapi.ipsec_sad_add_del_entry(
local_sa_id,
local_tra_spi,
integrity_key_length=20,
is_tunnel=0)
cls.vapi.ipsec_spd_add_del(spd_id)
cls.vapi.ipsec_interface_add_del_spd(spd_id, cls.pg2.sw_if_index)
l_startaddr = r_startaddr = socket.inet_pton(
socket.AF_INET, "0.0.0.0")
l_stopaddr = r_stopaddr = socket.inet_pton(
socket.AF_INET, "255.255.255.255")
cls.vapi.ipsec_spd_add_del_entry(
spd_id,
l_startaddr,
l_stopaddr,
r_startaddr,
r_stopaddr,
protocol=socket.IPPROTO_AH)
cls.vapi.ipsec_spd_add_del_entry(
spd_id,
l_startaddr,
l_stopaddr,
r_startaddr,
r_stopaddr,
protocol=socket.IPPROTO_AH,
is_outbound=0)
l_startaddr = l_stopaddr = cls.pg2.local_ip4n
r_startaddr = r_stopaddr = cls.pg2.remote_ip4n
cls.vapi.ipsec_spd_add_del_entry(
spd_id,
l_startaddr,
l_stopaddr,
r_startaddr,
r_stopaddr,
priority=10,
policy=3,
is_outbound=0,
sa_id=local_sa_id)
cls.vapi.ipsec_spd_add_del_entry(
spd_id,
l_startaddr,
l_stopaddr,
r_startaddr,
r_stopaddr,
priority=10,
policy=3,
sa_id=remote_sa_id)
except Exception:
raise
def configScapySA(self, is_tun=False):
if is_tun:
self.remote_tun_sa = SecurityAssociation(
AH,
spi=0x000003e8,
auth_algo='HMAC-SHA1-96',
auth_key='C91KUR9GYMm5GfkEvNjX',
tunnel_header=IP(
src=self.pg0.remote_ip4,
dst=self.pg0.local_ip4))
self.local_tun_sa = SecurityAssociation(
AH,
spi=0x000003e9,
auth_algo='HMAC-SHA1-96',
auth_key='C91KUR9GYMm5GfkEvNjX',
tunnel_header=IP(
dst=self.pg0.remote_ip4,
src=self.pg0.local_ip4))
else:
self.remote_tra_sa = SecurityAssociation(
AH, spi=0x000007d0, auth_algo='HMAC-SHA1-96',
auth_key='C91KUR9GYMm5GfkEvNjX')
self.local_tra_sa = SecurityAssociation(
AH, spi=0x000007d1, auth_algo='HMAC-SHA1-96',
auth_key='C91KUR9GYMm5GfkEvNjX')
def tearDown(self):
super(TestIpsecAh, self).tearDown()
if not self.vpp_dead:
self.vapi.cli("show hardware")
def send_and_expect(self, input, pkts, output, count=1):
input.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
rx = output.get_capture(count)
return rx
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() /
"XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX")
] * 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() /
"XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"
] * count
def test_ipsec_ah_tra_basic(self, count=1):
""" ipsec ah v4 transport basic test """
try:
self.configScapySA()
send_pkts = self.gen_encrypt_pkts(
self.remote_tra_sa,
self.pg2,
src=self.pg2.remote_ip4,
dst=self.pg2.local_ip4,
count=count)
recv_pkts = self.send_and_expect(
self.pg2, send_pkts, self.pg2, count=count)
# ESP TRA VPP encryption/decryption verification
for Pkts in recv_pkts:
Pkts[AH].padding = Pkts[AH].icv[12:]
Pkts[AH].icv = Pkts[AH].icv[:12]
self.local_tra_sa.decrypt(Pkts[IP])
finally:
self.logger.info(self.vapi.ppcli("show error"))
self.logger.info(self.vapi.ppcli("show ipsec"))
def test_ipsec_ah_tra_burst(self):
""" ipsec ah v4 transport burst test """
try:
self.test_ipsec_ah_tra_basic(count=257)
finally:
self.logger.info(self.vapi.ppcli("show error"))
self.logger.info(self.vapi.ppcli("show ipsec"))
def test_ipsec_ah_tun_basic(self, count=1):
""" ipsec ah 4o4 tunnel basic test """
try:
self.configScapySA(is_tun=True)
send_pkts = self.gen_encrypt_pkts(
self.remote_tun_sa,
self.pg0,
src=self.remote_pg0_lb_addr,
dst=self.remote_pg1_lb_addr,
count=count)
recv_pkts = self.send_and_expect(
self.pg0, send_pkts, self.pg1, count=count)
# ESP TUN VPP decryption verification
for recv_pkt in recv_pkts:
self.assert_equal(recv_pkt[IP].src, self.remote_pg0_lb_addr)
self.assert_equal(recv_pkt[IP].dst, self.remote_pg1_lb_addr)
send_pkts = self.gen_pkts(
self.pg1,
src=self.remote_pg1_lb_addr,
dst=self.remote_pg0_lb_addr,
count=count)
recv_pkts = self.send_and_expect(
self.pg1, send_pkts, self.pg0, count=count)
# ESP TUN VPP encryption verification
for recv_pkt in recv_pkts:
decrypt_pkt = self.local_tun_sa.decrypt(recv_pkt[IP])
decrypt_pkt = IP(decrypt_pkt[Raw].load)
self.assert_equal(decrypt_pkt.src, self.remote_pg1_lb_addr)
self.assert_equal(decrypt_pkt.dst, self.remote_pg0_lb_addr)
finally:
self.logger.info(self.vapi.ppcli("show error"))
self.logger.info(self.vapi.ppcli("show ipsec"))
def test_ipsec_ah_tun_burst(self):
""" ipsec ah 4o4 tunnel burst test """
try:
self.test_ipsec_ah_tun_basic(count=257)
finally:
self.logger.info(self.vapi.ppcli("show error"))
self.logger.info(self.vapi.ppcli("show ipsec"))
if __name__ == '__main__':
unittest.main(testRunner=VppTestRunner)
|
