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# ============================================================
# Dockerfile — WWTP Extreme Switch TLS 1.0 Proxy
#
# Uses Debian Bullseye (OpenSSL 1.1.1) instead of Alpine 3.18
# (OpenSSL 3.x) because OpenSSL 1.1.1 supports TLS 1.0 natively
# without requiring legacy provider hacks.
# ============================================================
FROM debian:bullseye-slim
# Install stunnel — Debian Bullseye ships OpenSSL 1.1.1 which
# supports TLS 1.0 out of the box. No legacy provider needed.
RUN apt-get update && \
apt-get install -y --no-install-recommends stunnel4 && \
rm -rf /var/lib/apt/lists/*
# Lower the OpenSSL minimum protocol to TLS 1.0
# Bullseye's default is TLSv1.2 — we override it here
RUN sed -i 's/MinProtocol = TLSv1.2/MinProtocol = TLSv1/' /etc/ssl/openssl.cnf && \
sed -i 's/CipherString = DEFAULT@SECLEVEL=2/CipherString = DEFAULT@SECLEVEL=1/' /etc/ssl/openssl.cnf
# Copy stunnel config into image
COPY stunnel.conf /etc/stunnel/stunnel.conf
# Expose all 20 switch proxy ports (4500-4519)
EXPOSE 4500 4501 4502 4503 4504 4505 4506 4507 4508 4509 \
4510 4511 4512 4513 4514 4515 4516 4517 4518 4519
# stunnel4 on Debian uses a wrapper script — call it directly
CMD ["stunnel4", "/etc/stunnel/stunnel.conf"]
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# WWTP Extreme Switch TLS Proxy
## stunnel Docker Container — Deployment Guide
### What This Does
Allows modern browsers (TLS 1.2/1.3) to reach Extreme switches
running firmware 1.01.02.0005 (TLS 1.0 only) via a stunnel proxy.
```
Browser (TLS 1.2/1.3)
stunnel container on 192.168.16.130
Switch (TLS 1.0) on 10.214.0.x
```
---
### Step 1 — Prepare the switches via SSH
Each switch needs HTTPS enabled before the proxy will work.
SSH into each switch and run:
```
enable
configure
http secure-server
save configuration
```
> wwtp-gate-sw01 (10.214.0.112) is already done and confirmed working.
---
### Step 2 — Build the Docker image on the Portainer host
Copy the three files (Dockerfile, stunnel.conf, docker-compose.yml)
to the same directory on your Portainer host, then build:
```bash
cd /path/to/stunnel-wwtp
docker build -t stunnel-wwtp:latest .
```
---
### Step 3 — Deploy via Portainer
1. Open Portainer → **Stacks****Add Stack**
2. Name it: `stunnel-wwtp`
3. Paste the contents of `docker-compose.yml` into the editor
4. Click **Deploy the stack**
---
### Step 4 — Access a switch in your browser
Use: `https://192.168.16.130:<port>`
| Port | Switch | Location |
|-------|-----------------|-----------------|
| 4500 | wwtp-offc-sw01 | Plant Office |
| 4501 | wwtp-srvr-sw01 | Server Room |
| 4502 | wwtp-ecb1-sw01 | Elec Ctrl Bldg 1 |
| 4503 | wwtp-head-sw01 | Head Works |
| 4504 | wwtp-ecb2-sw01 | Elec Ctrl Bldg 2 |
| 4505 | wwtp-ags1-sw01 | AGS Tank 1 |
| 4506 | wwtp-ags2-sw01 | AGS Tank 2 |
| 4507 | wwtp-ags3-sw01 | AGS Tank 3 |
| 4508 | wwtp-coag-sw01 | Coag & Buffer |
| 4509 | wwtp-reuse-sw01 | Reuse |
| 4510 | wwtp-ecb3-sw01 | Elec Ctrl Bldg 3 |
| 4511 | wwtp-yard-sw01 | Yard Drain |
| 4512 | wwtp-gate-sw01 | Gate ✅ TESTED |
| 4513 | wwtp-ecb1-sw02 | Elec Ctrl Bldg 1 |
| 4514 | wwtp-ecb2-sw02 | Elec Ctrl Bldg 2 |
| 4515 | wwtp-uv-sw01 | UV |
| 4516 | wwtp-fitr-sw01 | Filters |
| 4517 | wwtp-crn-sw01 | Crane Room |
| 4518 | wwtp-bst-sw01 | Beast |
| 4519 | wwtp-ecb3-sw02 | Elec Ctrl Bldg 3 |
> Your browser will warn about an invalid/self-signed certificate.
> Click through the warning — this is expected with old switch firmware.
---
### Troubleshooting
**Browser shows "connection refused"**
→ The switch doesn't have `http secure-server` enabled yet.
→ SSH to the switch and run the commands in Step 1.
**Browser shows "connection timed out"**
→ The switch is offline or unreachable.
**stunnel container won't start**
→ Check Portainer logs for the container.
→ Verify the image was built: `docker images | grep stunnel-wwtp`
**Test a specific switch from the host CLI:**
```bash
curl -k https://192.168.16.130:4512 # should return HTML from gate switch
```
---
### Notes
- `network_mode: host` is required so the container inherits the
host's routing table and can reach the 10.214.0.x subnet.
- `verify = 0` in stunnel.conf disables certificate validation —
necessary because switch certs are self-signed and likely expired.
- `sslVersion = TLSv1` forces TLS 1.0 on the switch-facing side only.
Your browser still connects to stunnel using modern TLS.
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# ============================================================
# docker-compose.yml — WWTP Extreme Switch TLS 1.0 Proxy
# Deploy via Portainer → Stacks → Add Stack → paste this file
# ============================================================
#
# Port reference (4400 + last octet of switch IP):
# :4500 → 10.214.0.100 wwtp-offc-sw01 Plant Office
# :4501 → 10.214.0.101 wwtp-srvr-sw01 Server Room
# :4502 → 10.214.0.102 wwtp-ecb1-sw01 Elec Ctrl Bldg 1
# :4503 → 10.214.0.103 wwtp-head-sw01 Head Works
# :4504 → 10.214.0.104 wwtp-ecb2-sw01 Elec Ctrl Bldg 2
# :4505 → 10.214.0.105 wwtp-ags1-sw01 AGS Tank 1
# :4506 → 10.214.0.106 wwtp-ags2-sw01 AGS Tank 2
# :4507 → 10.214.0.107 wwtp-ags3-sw01 AGS Tank 3
# :4508 → 10.214.0.108 wwtp-coag-sw01 Coag & Buffer
# :4509 → 10.214.0.109 wwtp-reuse-sw01 Reuse
# :4510 → 10.214.0.110 wwtp-ecb3-sw01 Elec Ctrl Bldg 3
# :4511 → 10.214.0.111 wwtp-yard-sw01 Yard Drain
# :4512 → 10.214.0.112 wwtp-gate-sw01 Gate ← TESTED/WORKING
# :4513 → 10.214.0.113 wwtp-ecb1-sw02 Elec Ctrl Bldg 1
# :4514 → 10.214.0.114 wwtp-ecb2-sw02 Elec Ctrl Bldg 2
# :4515 → 10.214.0.115 wwtp-uv-sw01 UV
# :4516 → 10.214.0.116 wwtp-fitr-sw01 Filters
# :4517 → 10.214.0.117 wwtp-crn-sw01 Crane Room
# :4518 → 10.214.0.118 wwtp-bst-sw01 Beast
# :4519 → 10.214.0.119 wwtp-ecb3-sw02 Elec Ctrl Bldg 3
#
# Browser usage: https://192.168.16.130:<port>
# Accept the self-signed cert warning in your browser
# ============================================================
version: "3.8"
services:
stunnel-wwtp:
image: stunnel-wwtp:latest
container_name: stunnel-wwtp
restart: always
network_mode: host
# network_mode: host is used so stunnel can reach the
# 10.214.0.x switch subnet via the host's routing table.
# Without this, the container would be NAT'd and unable
# to route to the switches.
ports: []
# Ports are bound directly via host networking above —
# no explicit port mapping needed here.
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foreground = yes
pid = /tmp/stunnel.pid
socket = l:TCP_NODELAY=1
socket = r:TCP_NODELAY=1
verify = 0
sslVersionMin = TLSv1
sslVersionMax = TLSv1
ciphers = DEFAULT:@SECLEVEL=0
[wwtp-offc-sw01]
client = yes
accept = 0.0.0.0:4500
connect = 10.214.0.100:443
[wwtp-srvr-sw01]
client = yes
accept = 0.0.0.0:4501
connect = 10.214.0.101:443
[wwtp-ecb1-sw01]
client = yes
accept = 0.0.0.0:4502
connect = 10.214.0.102:443
[wwtp-head-sw01]
client = yes
accept = 0.0.0.0:4503
connect = 10.214.0.103:443
[wwtp-ecb2-sw01]
client = yes
accept = 0.0.0.0:4504
connect = 10.214.0.104:443
[wwtp-ags1-sw01]
client = yes
accept = 0.0.0.0:4505
connect = 10.214.0.105:443
[wwtp-ags2-sw01]
client = yes
accept = 0.0.0.0:4506
connect = 10.214.0.106:443
[wwtp-ags3-sw01]
client = yes
accept = 0.0.0.0:4507
connect = 10.214.0.107:443
[wwtp-coag-sw01]
client = yes
accept = 0.0.0.0:4508
connect = 10.214.0.108:443
[wwtp-reuse-sw01]
client = yes
accept = 0.0.0.0:4509
connect = 10.214.0.109:443
[wwtp-ecb3-sw01]
client = yes
accept = 0.0.0.0:4510
connect = 10.214.0.110:443
[wwtp-yard-sw01]
client = yes
accept = 0.0.0.0:4511
connect = 10.214.0.111:443
[wwtp-gate-sw01]
client = yes
accept = 0.0.0.0:4512
connect = 10.214.0.112:443
[wwtp-ecb1-sw02]
client = yes
accept = 0.0.0.0:4513
connect = 10.214.0.113:443
[wwtp-ecb2-sw02]
client = yes
accept = 0.0.0.0:4514
connect = 10.214.0.114:443
[wwtp-uv-sw01]
client = yes
accept = 0.0.0.0:4515
connect = 10.214.0.115:443
[wwtp-fitr-sw01]
client = yes
accept = 0.0.0.0:4516
connect = 10.214.0.116:443
[wwtp-crn-sw01]
client = yes
accept = 0.0.0.0:4517
connect = 10.214.0.117:443
[wwtp-bst-sw01]
client = yes
accept = 0.0.0.0:4518
connect = 10.214.0.118:443
[wwtp-ecb3-sw02]
client = yes
accept = 0.0.0.0:4519
connect = 10.214.0.119:443