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本项目已弃用,推荐使用 https://github.com/corelight/zeek-spicy-openvpn
一个用于在以下模式下检测和解析 OpenVPN 的插件:
到目前为止,该插件尚不能检测 UDP 或 TCP 的共享密钥模式。
如果此协议分析器能够解析 TLS 信息,你将在 ssl.log 中找到相关数据。TCP TLS 支持已可用,而 UDP TLS 支持将在 Zeek >= v4.1 中提供。如果你确实需要该功能,可以安装此更改,UDP 也将可用:
https://github.com/zeek/zeek/pull/1428
如果你已安装 zkg 并且已经运行过……
zkg autoconfig
……那么你可以按如下方式安装此软件包:
sudo zkg install zeek-openvpn
现在,在任何 Zeek 脚本中,只需加载该插件,它即可"开箱即用":
@load zeek/openvpn
该插件的新事件位于 events.bif 中。事件参数可在 types.zeek 中找到。
默认情况下,分析器在检测到 OpenVPN 握手后会禁用自身,以避免消耗额外的 CPU 周期;但你可以将以下变量设置为 false,以改为分析整个连接:
@load zeek/openvpn
redef OpenVPN::disable_analyzer_after_detection = F;
PCAP 文件可在 Traces 目录中找到。
$ cat test.zeek
@load zeek/openvpn
@load ja3
event OpenVPN::control_message(c: connection, is_orig: bool, msg: OpenVPN::ControlMsg) { print cat(msg); }
event OpenVPN::ack_message(c: connection, is_orig: bool, msg: OpenVPN::AckMsg) { print cat(msg); }
event OpenVPN::data_message(c: connection, is_orig: bool, msg: OpenVPN::DataMsg) { print cat(msg); }
$ zeek -Cr 9841-openvpn_udp_tlsauth.pcap test.zeek
[opcode=7, key_id=0, session_id=\x07I\x81\xbdyzU\x8d, packet_id_ack_array=[], remote_session_id=<uninitialized>, packet_id=0, data_len=0, msg_type=7]
[opcode=8, key_id=0, session_id=f\xf9G\x09\x18\x8d\xae+, packet_id_ack_array=[0], remote_session_id=\x07I\x81\xbdyzU\x8d, packet_id=0, data_len=0, msg_type=8]
[opcode=5, key_id=0, session_id=\x07I\x81\xbdyzU\x8d, packet_id_ack_array=[0], remote_session_id=f\xf9G\x09\x18\x8d\xae+, msg_type=5]
[opcode=4, key_id=0, session_id=\x07I\x81\xbdyzU\x8d, packet_id_ack_array=[], remote_session_id=<uninitialized>, packet_id=1, data_len=100, msg_type=4]
[opcode=4, key_id=0, session_id=\x07I\x81\xbdyzU\x8d, packet_id_ack_array=[], remote_session_id=<uninitialized>, packet_id=2, data_len=100, msg_type=4]
[opcode=4, key_id=0, session_id=\x07I\x81\xbdyzU\x8d, packet_id_ack_array=[], remote_session_id=<uninitialized>, packet_id=3, data_len=26, msg_type=4]
[opcode=5, key_id=0, session_id=f\xf9G\x09\x18\x8d\xae+, packet_id_ack_array=[1], remote_session_id=\x07I\x81\xbdyzU\x8d, msg_type=5]
[opcode=5, key_id=0, session_id=f\xf9G\x09\x18\x8d\xae+, packet_id_ack_array=[2], remote_session_id=\x07I\x81\xbdyzU\x8d, msg_type=5]
[opcode=4, key_id=0, session_id=f\xf9G\x09\x18\x8d\xae+, packet_id_ack_array=[3], remote_session_id=\x07I\x81\xbdyzU\x8d, packet_id=1, data_len=100, msg_type=4]
...
[opcode=5, key_id=0, session_id=f\xf9G\x09\x18\x8d\xae+, packet_id_ack_array=[38], remote_session_id=\x07I\x81\xbdyzU\x8d, msg_type=5]
[opcode=4, key_id=0, session_id=f\xf9G\x09\x18\x8d\xae+, packet_id_ack_array=[], remote_session_id=<uninitialized>, packet_id=53, data_len=100, msg_type=4]
[opcode=4, key_id=0, session_id=f\xf9G\x09\x18\x8d\xae+, packet_id_ack_array=[], remote_session_id=<uninitialized>, packet_id=54, data_len=54, msg_type=4]
[opcode=5, key_id=0, session_id=\x07I\x81\xbdyzU\x8d, packet_id_ack_array=[53], remote_session_id=f\xf9G\x09\x18\x8d\xae+, msg_type=5]
[opcode=5, key_id=0, session_id=\x07I\x81\xbdyzU\x8d, packet_id_ack_array=[54], remote_session_id=f\xf9G\x09\x18\x8d\xae+, msg_type=5]
[opcode=6, key_id=0, data_len=52, peer_id=<uninitialized>, msg_type=6]
[opcode=6, key_id=0, data_len=52, peer_id=<uninitialized>, msg_type=6]
$ grep openvpn conn.log
1353592367.157643 C69gk04obOrLdomzv9 192.168.56.103 60514 192.168.56.102 1194 udp openvpnhmac 12.839080 7932 9373 SF - - 0 Dd 93 10536 91 11921 -
如果能够捕获 TLS 握手,你将在 ssl.log 中找到更多信息:
$ zeek -Cr 9840-openvpn_tcp_nontlsauth.pcap test.zeek
[opcode=7, key_id=0, session_id=Pz(\xa7\x82ux\x8d, packet_id_ack_array=[], remote_session_id=<uninitialized>, packet_id=0, data_len=0, msg_type=7]
[opcode=8, key_id=0, session_id=\x9a\xd7G\xbe\xb2M\x8a\x1b, packet_id_ack_array=[0], remote_session_id=Pz(\xa7\x82ux\x8d, packet_id=0, data_len=0, msg_type=8]
[opcode=5, key_id=0, session_id=Pz(\xa7\x82ux\x8d, packet_id_ack_array=[0], remote_session_id=\x9a\xd7G\xbe\xb2M\x8a\x1b, msg_type=5]
[opcode=4, key_id=0, session_id=Pz(\xa7\x82ux\x8d, packet_id_ack_array=[], remote_session_id=<uninitialized>, packet_id=1, data_len=100, msg_type=4]
[opcode=4, key_id=0, session_id=Pz(\xa7\x82ux\x8d, packet_id_ack_array=[], remote_session_id=<uninitialized>, packet_id=2, data_len=100, msg_type=4]
[opcode=4, key_id=0, session_id=Pz(\xa7\x82ux\x8d, packet_id_ack_array=[], remote_session_id=<uninitialized>, packet_id=3, data_len=26, msg_type=4]
[opcode=5, key_id=0, session_id=\x9a\xd7G\xbe\xb2M\x8a\x1b, packet_id_ack_array=[1], remote_session_id=Pz(\xa7\x82ux\x8d, msg_type=5]
[opcode=5, key_id=0, session_id=\x9a\xd7G\xbe\xb2M\x8a\x1b, packet_id_ack_array=[2], remote_session_id=Pz(\xa7\x82ux\x8d, msg_type=5]
...
[opcode=6, key_id=0, data_len=124, peer_id=<uninitialized>, msg_type=6]
[opcode=6, key_id=0, data_len=124, peer_id=<uninitialized>, msg_type=6]
[opcode=6, key_id=0, data_len=124, peer_id=<uninitialized>, msg_type=6]
[opcode=6, key_id=0, data_len=124, peer_id=<uninitialized>, msg_type=6]
[opcode=6, key_id=0, data_len=52, peer_id=<uninitialized>, msg_type=6]
$ cat conn.log
#separator \x09
#set_separator ,
#empty_field (empty)
#unset_field -
#path conn
#open 2021-03-05-15-08-12
#fields ts uid id.orig_h id.orig_p id.resp_h id.resp_p proto service duration orig_bytes resp_bytes conn_state local_orig local_resp missed_bytes history orig_pkts orig_ip_bytes resp_pkts resp_ip_bytes tunnel_parents
#types time string addr port addr port enum string interval count count string bool bool count string count count count count set[string]
1358197736.781122 CW4BxU1d0sa8b429pg 192.168.56.103 39772 192.168.56.102 1194 tcp ssl,openvpntcp 32.021256 6986 7709 S1 - - 0 ShADad 100 12194 95 12657 -
#close 2021-03-05-15-08-12
$ cat ssl.log
#separator \x09
#set_separator ,
#empty_field (empty)
#unset_field -
#path ssl
#open 2021-03-05-15-08-12
#fields ts uid id.orig_h id.orig_p id.resp_h id.resp_p version cipher curve server_name resumed last_alert next_protocol established cert_chain_fuids client_cert_chain_fuids subject issuer client_subject client_issuer ja3 ja3s
#types time string addr port addr port string string string string bool string string bool vector[string] vector[string] string string string string string string
1358197737.844659 CW4BxU1d0sa8b429pg 192.168.56.103 39772 192.168.56.102 1194 TLSv10 TLS_DHE_RSA_WITH_AES_256_CBC_SHA - - F - - T FIgTSu4XxFLZ2E4pV8,FBAmci2bnwWasltS9i FdSmvb4Z4RmNS42M3g,FHh4nUMj6vdVO6Jtf emailAddress=PRO3,name=PRO3,CN=PRO3,OU=PRO3,O=PRO3,L=PRO3,ST=OE,C=AT emailAddress=PRO3,name=PRO3,CN=PRO3,OU=PRO3,O=PRO3,L=PRO3,ST=OE,C=AT emailAddress=PRO3,name=PRO3,CN=PRO3-Client,OU=PRO3,O=PRO3,L=PRO3,ST=OE,C=AT emailAddress=PRO3,name=PRO3,CN=PRO3,OU=PRO3,O=PRO3,L=PRO3,ST=OE,C=AT f0d20361ae57a5c81d94ac774a736a52 7a2f70a16da750662fc0291d88ebddf8
#close 2021-03-05-15-08-12
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