[ipsec][strongswan] 使用wireshark查看strongswan ipsec esp ikev1 ikev2的加密内容

姊妹篇:[https][tls] 如何使用wireshark查看tls/https加密消息

一，编译，启用strongswan的save-keys plugin

./configure --prefix=/root/OUTPUT --exec-prefix=/root/OUTPUT --enable-save-keys  CFLAGS="-g -O0"

运行之前验证一下，是否加载了这个插件

[root@T9 OUTPUT]# ./sbin/swanctl --stat |grep save
loaded plugins: charon aes save-keys des rc2 sha2 sha1 md5 mgf1 random nonce x509 revocation constraints pubkey
 pkcs1 pkcs7 pkcs8 pkcs12 pgp dnskey sshkey pem fips-prf gmp curve25519 xcbc cmac hmac attr kernel-netlink 
resolve socket-default stroke vici updown xauth-generic counters

二，增加如下配置

charon {
        load_modular = yes
        plugins {
                include strongswan.d/charon/*.conf
                save-keys {
                        esp = yes
                        ike = yes
                        load = yes
                        wireshark_keys = /root/OUTPUT/etc/keys
                }
        }

详细的解释，可以查man手册

       charon.plugins.save-keys.esp [no]
              Whether to save ESP keys.
       charon.plugins.save-keys.ike [no]
              Whether to save IKE keys.
       charon.plugins.save-keys.load [no]
              Whether to load the plugin.
       charon.plugins.save-keys.wireshark_keys []
              Directory  where  the  keys  are  stored  in the format supported by Wireshark. IKEv1 keys are stored in the ikev1_decryption_table file. 
              IKEv2 keys are stored in the ikev2_decryption_table file. 
              Keys for ESP CHILD_SAs are stored in the esp_sa file.

三，正常运行之后，这个目录下，就会存着key了，同时把包抓下来

./sbin/swanctl --load-all
./sbin/ipsec up net-net

查看保存的key

[root@T9 OUTPUT]# ll etc/keys/
total 8
-rw-r--r-- 1 root root 410 Dec 20 17:42 esp_sa
-rw-r--r-- 1 root root 284 Dec 20 17:42 ikev2_decryption_table

四，配置wireshark

IKE：

edit->preferences->protocols->ISAKMP->IKEv2 Decryption Table->Edit

如图，看见这后边有个蓝色的文件名。

用前边获得的那个文件覆盖它。

cp ikev2_decryption_table /home/tong/.config/wireshark/ikev2_decryption_table

ESP：

edit->preferences->protocols->ESP->Edit

然后点加号，编辑

或者。直接cp进去到配置目录

cp esp_sa /home/tong/.config/wireshark/

五。用wirshark再次打开之前抓到的pcap包。

好了。现在的IKEV2和ESP都是解密过的了。