与TrustSec SGT轴向标记和SGT意识基于区域的防火墙配置示例的GETVPN
目录
简介
此条款将提交如何配置GETVPN推送允许发送和接收的策略安全组标记(SGT)插入到加密的信息包。示例将介入标记所有流量用特定SGT标记和应用区域基于防火墙(ZBF)策略的两个分组根据已接收SGT标记。
先决条件
要求
Cisco 建议您了解以下主题：
- IOS命令行界面(CLI)配置和GETVPN配置基础知识
- Trustsec服务基础知识。
- 基于区域的防火墙基础知识
使用的组件
本文档中的信息基于以下软件版本：
- 有软件的15.3(2)T思科2921路由器和更新
拓扑
R3 - Branch1的边界路由器， GETVPN组成员
R4 - Branch2的边界路由器， GETVPN组成员
R1,R2 - GETVPN密钥服务器在中心站点
运行在所有路由器的OSPF
从KS推送的ACL强制流量的加密10.0.0.0/16 <-> 10.0.0.0/16之间
R3路由器用SGT标记标记从Branch1发送的所有流量= 3
R4路由器用SGT标记标记从Branch2发送的所有流量= 4
R3删除SGT标记，当发送往LAN时(假定的流量R5不支持轴向标记)
R4删除SGT标记，当发送往LAN时(假定的流量R6不支持轴向标记)
R4没有防火墙(接受所有信息包)
R3配置与与以下策略的ZBF ：
-接受从LAN的所有流量往广域网
-接受用从广域网的SGT=4标记的仅ICMP往LAN
配置
R1 (关键服务器在中心站点)
要发送允许发送和接收的策略标记信息包“TAC cts sgt”命令需要存在：
interface Loopback0
ip address 10.0.1.1 255.255.255.0
!
interface Ethernet0/0
ip address 192.168.0.1 255.255.255.0
crypto ipsec transform-set TS esp-aes esp-sha256-hmac
mode tunnel
!
crypto ipsec profile prof1
set transform-set TS
!
crypto gdoi group group1
identity number 1
server local
rekey authentication mypubkey rsa GETKEY
rekey transport unicast
sa ipsec 1
profile prof1
match address ipv4 GET-IPV4
replay counter window-size 64
tag cts sgt
address ipv4 192.168.0.1
redundancy
local priority 100
peer address ipv4 192.168.0.2
router ospf 1
network 10.0.0.0 0.0.255.255 area 0
network 192.168.0.0 0.0.0.255 area 0
ip access-list extended GET-IPV4
permit icmp 10.0.0.0 0.0.255.255 10.0.0.0 0.0.255.255
R2的配置是非常类似的。
R3 (Branch1的组成员)
没有SGT标记， GETVPN配置是相同的象为方案。LAN接口配置与手工的trustsec ：
- “策略静态sgt 3委托” -标记从LAN接收的所有信息包使用SGT=3
- 当传送往LAN时的数据包“没有繁殖sgt” -删除所有SGT标记
crypto gdoi group group1
identity number 1
server address ipv4 192.168.0.1
server address ipv4 192.168.0.2
!
!
crypto map cmap 10 gdoi
set group group1
interface Ethernet0/0
ip address 192.168.0.3 255.255.255.0
crypto map cmap
!
interface Ethernet0/1
ip address 10.0.3.1 255.255.255.0
cts manual
no propagate sgt
policy static sgt 3 trusted
router ospf 1
network 10.0.0.0 0.0.255.255 area 0
network 192.168.0.0 0.0.0.255 area 0
在R3的ZBF配置：
从LAN的所有信息包将接受。仅从用SGT=4标记的广域网ICMP数据包将接受：
class-map type inspect match-all TAG_4_ICMP
match security-group source tag 4
match protocol icmp
!
policy-map type inspect FROM_LAN
class class-default
pass log
policy-map type inspect FROM_WAN
class type inspect TAG_4_ICMP
pass log
class class-default
drop log
!
zone security lan
zone security wan
zone-pair security WAN-LAN source wan destination lan
service-policy type inspect FROM_WAN
zone-pair security LAN-WAN source lan destination wan
service-policy type inspect FROM_LAN
interface Ethernet0/0
zone-member security wan
!
interface Ethernet0/1
zone-member security lan
R4在Branch2配置方面是非常类似的除了没有配置那里的ZBF。
R5， R6配置
R5和R6模拟在两个分组的本地LAN。R5的配置示例：
interface Ethernet0/0
ip address 10.0.3.10 255.255.255.0
router ospf 1
network 10.0.0.0 0.0.255.255 area 0
验证
Tesing SGT意识GETVPN
检查是否Branch1的(R3)组成员支持SGT标记：
R3#show crypto gdoi feature cts-sgt
Version Feature Supported
1.0.8 Yes
检查推送的TEK策略分组Branch1的(R3)成员是否使用SGT ：
R3#show crypto gdoi
GROUP INFORMATION
<...some output ommited for clarity...>
TEK POLICY for the current KS-Policy ACEs Downloaded:
Ethernet0/0:
IPsec SA:
spi: 0xD100D58E(3506492814)
transform: esp-aes esp-sha256-hmac
sa timing:remaining key lifetime (sec): expired
Anti-Replay(Counter Based) : 64
tag method : cts sgt
alg key size: 16 (bytes)
sig key size: 32 (bytes)
encaps: ENCAPS_TUNNEL
IPsec SA:
spi: 0x52B3CA86(1387514502)
transform: esp-aes esp-sha256-hmac
sa timing:remaining key lifetime (sec): (1537)
Anti-Replay(Counter Based) : 64
tag method : cts sgt
alg key size: 16 (bytes)
sig key size: 32 (bytes)
encaps: ENCAPS_TUNNEL
发送ICMP流量从R6到R5 ：
R6#ping 10.0.3.10 repeat 10
Type escape sequence to abort.
Sending 10, 100-byte ICMP Echos to 10.0.3.10, timeout is 2 seconds:
!!!!!!!!!!
Success rate is 100 percent (10/10), round-trip min/avg/max = 1/1/6 ms
检查R3是否附加SGT标记到加密的信息包：
R3#show crypto ipsec sa detail
interface: Ethernet0/0
Crypto map tag: cmap, local addr 192.168.0.3
protected vrf: (none)
local ident (addr/mask/prot/port): (10.0.0.0/255.255.0.0/1/0)
remote ident (addr/mask/prot/port): (10.0.0.0/255.255.0.0/1/0)
Group: group1
current_peer 0.0.0.0 port 848
PERMIT, flags={}
#pkts encaps: 39, #pkts encrypt: 39, #pkts digest: 39
#pkts decaps: 39, #pkts decrypt: 39, #pkts verify: 39
#pkts compressed: 0, #pkts decompressed: 0
#pkts not compressed: 0, #pkts compr. failed: 0
#pkts not decompressed: 0, #pkts decompress failed: 0
#pkts no sa (send) 0, #pkts invalid sa (rcv) 0
#pkts encaps failed (send) 0, #pkts decaps failed (rcv) 0
#pkts invalid prot (recv) 0, #pkts verify failed: 0
#pkts invalid identity (recv) 0, #pkts invalid len (rcv) 0
#pkts replay rollover (send): 0, #pkts replay rollover (rcv) 0
##pkts replay failed (rcv): 0
#pkts tagged (send): 39, #pkts untagged (rcv): 39
<...some output ommited for clarity...>
检查dataplane计数器在组成员的GETVPN Branch2的(R3) ：
R3#show crypto gdoi gm dataplane counters
Data-plane statistics for group group1:
#pkts encrypt : 53 #pkts decrypt : 53
#pkts tagged (send) : 53 #pkts untagged (rcv) : 53
#pkts no sa (send) : 0 #pkts invalid sa (rcv) : 0
#pkts encaps fail (send) : 0 #pkts decap fail (rcv) : 0
#pkts invalid prot (rcv) : 0 #pkts verify fail (rcv) : 0
#pkts not tagged (send) : 0 #pkts not untagged (rcv) : 0
#pkts internal err (send): 0 #pkts internal err (rcv) : 0
使用调试，根据平台更多详细信息可以被透露。例如在R3 ：
R3#debug cts platform l2-sgt rx
R3#debug cts platform l2-sgt tx
从LAN的R3接收的数据包应该是被标记的SGT ：
01:48:08: cts-l2sgt_rx:l2cts-policysgt:[in=Ethernet0/1 src=0100.5e00.0005 dst=aabb.cc00.6800] Policy SGT Assign [pak=F1B00E00:flag=0x1:psgt=3]
并且加密的信息包通过通道发送将是标记为的：
01:49:28: cts_ether_cmd_handle_post_encap_feature:pak[36BF868]:size=106 in=Ethernet0/1 out=Ethernet0/0 enctype=1 encsize=0 sgt_offset=18 [adj]:idb=Ethernet0/0 is_dot1q=0 linktype=7 mac_length=22 SGT=3
测试SGT意识ZBF
R3将接受用SGT=4标记的仅ICMP数据包来自广域网。当发送ICMP数据包从R6到R5时：
R6#ping 10.0.3.10 repeat 11
Type escape sequence to abort.
Sending 1, 100-byte ICMP Echos to 10.0.3.10, timeout is 2 seconds:
!
Success rate is 100 percent (1/1), round-trip min/avg/max = 1/1/6 ms
R3将收到标记为的ESP数据包，解密它。然后ZBF将接收流量：
*Mar 17 12:45:28.039: %FW-6-PASS_PKT: (target:class)-(WAN-LAN:TAG_4_ICMP) Passing icmp pkt 10.0.4.10:0 => 10.0.3.10:0 with ip ident 57
并且策略映射将提交计数器用接受的数据包编号：
R3#show policy-firewall stats all
Global Stats:
Session creations since subsystem startup or last reset 0
Current session counts (estab/half-open/terminating) [0:0:0]
Maxever session counts (estab/half-open/terminating) [0:0:0]
Last session created never
Last statistic reset never
Last session creation rate 0
Maxever session creation rate 0
Last half-open session total 0
policy exists on zp WAN-LAN
Zone-pair: WAN-LAN
Service-policy inspect : FROM_WAN
Class-map: TAG_4_ICMP (match-all)
Match: security-group source tag 4
Match: protocol icmp
Pass
18 packets, 1440 bytes
Class-map: class-default (match-any)
Match: any
Drop
3 packets, 72 bytes
policy exists on zp LAN-WAN
Zone-pair: LAN-WAN
Service-policy inspect : FROM_LAN
Class-map: class-default (match-any)
Match: any
Pass
18 packets, 1440 bytes
当尝试从R6远程登录到将由R3丢弃的R5时-，因为telnet未允许：
*Mar 17 12:49:30.475: %FW-6-DROP_PKT: Dropping tcp session 10.0.4.10:37500 10.0.3.10:23 on zone-pair WAN-LAN class class-default due to DROP action found in policy-map with ip ident 36123
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