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IPSEC: ESP with ESN tests and fixes

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Change-Id: Ie42b26e6d5cdb7b23f370ea2933c65079e8d1089
Signed-off-by: Neale Ranns <nranns@cisco.com>
This commit is contained in:
Neale Ranns
2019-04-10 17:24:29 +00:00
committed by Damjan Marion
parent 11a73973c9
commit 49e7ef60cb
4 changed files with 37 additions and 27 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
src/vnet/ipsec/esp_decrypt.c
View File

@@ -177,7 +177,7 @@ esp_decrypt_inline (vlib_main_t * vm,
payload = b[0]->data + pd->current_data;
/* we need 4 extra bytes for HMAC calculation when ESN are used */
if ((sa0->flags & IPSEC_SA_FLAG_USE_ESN) && pd->icv_sz &&
if (ipsec_sa_is_set_USE_ESN (sa0) && pd->icv_sz &&
(pd->current_data + pd->current_length + 4 > buffer_data_size))
{
b[0]->error = node->errors[ESP_DECRYPT_ERROR_NO_TAIL_SPACE];
@@ -211,7 +211,7 @@ esp_decrypt_inline (vlib_main_t * vm,
op->digest = payload + len;
op->digest_len = cpd.icv_sz;
op->len = len;
if (PREDICT_TRUE (sa0->flags & IPSEC_SA_FLAG_USE_ESN))
if (ipsec_sa_is_set_USE_ESN (sa0))
{
/* shift ICV for 4 bytes to insert ESN */
u8 tmp[ESP_MAX_ICV_SIZE], sz = sizeof (sa0->seq_hi);
@@ -219,7 +219,7 @@ esp_decrypt_inline (vlib_main_t * vm,
clib_memcpy_fast (payload + len, &sa0->seq_hi, sz);
clib_memcpy_fast (payload + len + sz, tmp, ESP_MAX_ICV_SIZE);
op->len += sz;
op->dst += sz;
op->digest += sz;
}
}

2
src/vnet/ipsec/esp_encrypt.c
View File

@@ -453,7 +453,7 @@ esp_encrypt_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
if (ipsec_sa_is_set_USE_ESN (sa0))
{
u32 seq_hi = clib_net_to_host_u32 (sa0->seq_hi);
clib_memcpy_fast (op->dst, &seq_hi, sizeof (seq_hi));
clib_memcpy_fast (op->digest, &seq_hi, sizeof (seq_hi));
op->len += sizeof (seq_hi);
}
}

35
test/patches/scapy-2.4/ipsec.patch
View File

@@ -1,8 +1,8 @@
diff --git a/scapy/layers/ipsec.py b/scapy/layers/ipsec.py
index 69e7ae3b..99373466 100644
index 69e7ae3b..b35da2b1 100644
--- a/scapy/layers/ipsec.py
+++ b/scapy/layers/ipsec.py
@@ -518,12 +517,16 @@ class AuthAlgo(object):
@@ -518,12 +518,16 @@ class AuthAlgo(object):
else:
return self.mac(key, self.digestmod(), default_backend())
@@ -20,7 +20,14 @@ index 69e7ae3b..99373466 100644
@return: the signed packet
"""
@@ -539,11 +542,13 @@ class AuthAlgo(object):
@@ -534,16 +538,20 @@ class AuthAlgo(object):
if pkt.haslayer(ESP):
mac.update(raw(pkt[ESP]))
+ if trailer:
+ mac.update(trailer)
pkt[ESP].data += mac.finalize()[:self.icv_size]
elif pkt.haslayer(AH):
clone = zero_mutable_fields(pkt.copy(), sending=True)
mac.update(raw(clone))
@@ -35,7 +42,7 @@ index 69e7ae3b..99373466 100644
"""
Check that the integrity check value (icv) of a packet is valid.
@@ -574,6 +579,8 @@ class AuthAlgo(object):
@@ -574,6 +582,8 @@ class AuthAlgo(object):
clone = zero_mutable_fields(pkt.copy(), sending=False)
mac.update(raw(clone))
@@ -44,7 +51,7 @@ index 69e7ae3b..99373466 100644
computed_icv = mac.finalize()[:self.icv_size]
# XXX: Cannot use mac.verify because the ICV can be truncated
@@ -757,7 +764,8 @@ class SecurityAssociation(object):
@@ -757,7 +767,8 @@ class SecurityAssociation(object):
SUPPORTED_PROTOS = (IP, IPv6)
def __init__(self, proto, spi, seq_num=1, crypt_algo=None, crypt_key=None,
@@ -54,7 +61,7 @@ index 69e7ae3b..99373466 100644
"""
@param proto: the IPsec proto to use (ESP or AH)
@param spi: the Security Parameters Index of this SA
@@ -771,6 +779,7 @@ class SecurityAssociation(object):
@@ -771,6 +782,7 @@ class SecurityAssociation(object):
to encapsulate the encrypted packets.
@param nat_t_header: an instance of a UDP header that will be used
for NAT-Traversal.
@@ -62,7 +69,7 @@ index 69e7ae3b..99373466 100644
"""
if proto not in (ESP, AH, ESP.name, AH.name):
@@ -782,6 +791,7 @@ class SecurityAssociation(object):
@@ -782,6 +794,7 @@ class SecurityAssociation(object):
self.spi = spi
self.seq_num = seq_num
@@ -70,7 +77,7 @@ index 69e7ae3b..99373466 100644
if crypt_algo:
if crypt_algo not in CRYPT_ALGOS:
@@ -827,6 +837,17 @@ class SecurityAssociation(object):
@@ -827,6 +840,17 @@ class SecurityAssociation(object):
raise TypeError('packet spi=0x%x does not match the SA spi=0x%x' %
(pkt.spi, self.spi))
@@ -88,7 +95,7 @@ index 69e7ae3b..99373466 100644
def _encrypt_esp(self, pkt, seq_num=None, iv=None):
if iv is None:
@@ -835,7 +856,8 @@ class SecurityAssociation(object):
@@ -835,7 +859,8 @@ class SecurityAssociation(object):
if len(iv) != self.crypt_algo.iv_size:
raise TypeError('iv length must be %s' % self.crypt_algo.iv_size)
@@ -98,7 +105,7 @@ index 69e7ae3b..99373466 100644
if self.tunnel_header:
tunnel = self.tunnel_header.copy()
@@ -857,7 +879,7 @@ class SecurityAssociation(object):
@@ -857,7 +882,7 @@ class SecurityAssociation(object):
esp = self.crypt_algo.pad(esp)
esp = self.crypt_algo.encrypt(self, esp, self.crypt_key)
@@ -107,7 +114,7 @@ index 69e7ae3b..99373466 100644
if self.nat_t_header:
nat_t_header = self.nat_t_header.copy()
@@ -884,7 +906,8 @@ class SecurityAssociation(object):
@@ -884,7 +909,8 @@ class SecurityAssociation(object):
def _encrypt_ah(self, pkt, seq_num=None):
@@ -117,7 +124,7 @@ index 69e7ae3b..99373466 100644
icv = b"\x00" * self.auth_algo.icv_size)
if self.tunnel_header:
@@ -924,7 +947,8 @@ class SecurityAssociation(object):
@@ -924,7 +950,8 @@ class SecurityAssociation(object):
else:
ip_header.plen = len(ip_header.payload) + len(ah) + len(payload)
@@ -127,7 +134,7 @@ index 69e7ae3b..99373466 100644
# sequence number must always change, unless specified by the user
if seq_num is None:
@@ -955,11 +979,12 @@ class SecurityAssociation(object):
@@ -955,11 +982,12 @@ class SecurityAssociation(object):
def _decrypt_esp(self, pkt, verify=True):
@@ -141,7 +148,7 @@ index 69e7ae3b..99373466 100644
esp = self.crypt_algo.decrypt(self, encrypted, self.crypt_key,
self.crypt_algo.icv_size or
@@ -998,9 +1023,11 @@ class SecurityAssociation(object):
@@ -998,9 +1026,11 @@ class SecurityAssociation(object):
def _decrypt_ah(self, pkt, verify=True):

21
test/test_ipsec_esp.py
View File

@@ -100,6 +100,7 @@ class ConfigIpsecESP(TemplateIpsec):
addr_any = params.addr_any
addr_bcast = params.addr_bcast
e = VppEnum.vl_api_ipsec_spd_action_t
flags = params.flags
objs = []
params.tun_sa_in = VppIpsecSA(self, scapy_tun_sa_id, scapy_tun_spi,
@@ -107,13 +108,15 @@ class ConfigIpsecESP(TemplateIpsec):
crypt_algo_vpp_id, crypt_key,
self.vpp_esp_protocol,
self.tun_if.local_addr[addr_type],
self.tun_if.remote_addr[addr_type])
self.tun_if.remote_addr[addr_type],
flags=flags)
params.tun_sa_out = VppIpsecSA(self, vpp_tun_sa_id, vpp_tun_spi,
auth_algo_vpp_id, auth_key,
crypt_algo_vpp_id, crypt_key,
self.vpp_esp_protocol,
self.tun_if.remote_addr[addr_type],
self.tun_if.local_addr[addr_type])
self.tun_if.local_addr[addr_type],
flags=flags)
objs.append(params.tun_sa_in)
objs.append(params.tun_sa_out)
@@ -337,7 +340,7 @@ class TemplateIpsecEspUdp(ConfigIpsecESP):
self.logger.info(self.vapi.cli("show hardware"))
class TestIpsecEspUdp(TemplateIpsecEspUdp, IpsecTra4Tests, IpsecTun4Tests):
class TestIpsecEspUdp(TemplateIpsecEspUdp, IpsecTra4Tests):
""" Ipsec NAT-T ESP UDP tests """
pass
@@ -354,7 +357,7 @@ class TestIpsecEspAll(ConfigIpsecESP,
super(TestIpsecEspAll, self).tearDown()
def test_crypto_algs(self):
"""All engines AES-CBC-[128, 192, 256] w/o ESN"""
"""All engines AES-CBC-[128, 192, 256] w/ & w/o ESN"""
# foreach VPP crypto engine
engines = ["ia32", "ipsecmb", "openssl"]
@@ -373,9 +376,9 @@ class TestIpsecEspAll(ConfigIpsecESP,
'scapy': "AES-CBC",
'key': "JPjyOWBeVEQiMe7hJPjyOWBeVEQiMe7h"}]
# bug found in VPP needs fixing with flag
# (VppEnum.vl_api_ipsec_sad_flags_t.IPSEC_API_SAD_FLAG_USE_ESN)
flags = [0]
# with and without ESN
flags = [0,
VppEnum.vl_api_ipsec_sad_flags_t.IPSEC_API_SAD_FLAG_USE_ESN]
#
# loop through the VPP engines
@@ -418,8 +421,8 @@ class TestIpsecEspAll(ConfigIpsecESP,
#
self.verify_tra_basic6(count=17)
self.verify_tra_basic4(count=17)
self.verify_tun_66(self.params[socket.AF_INET6], 17)
self.verify_tun_44(self.params[socket.AF_INET], 17)
self.verify_tun_66(self.params[socket.AF_INET6], 1)
self.verify_tun_44(self.params[socket.AF_INET], 1)
#
# remove the SPDs, SAs, etc