security: redact plaintext password from all files
Replace all occurrences of the fleet admin password with REDACTED_PASSWORD.
Git history will be rewritten next to purge it from all prior commits.
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+26
-24
@@ -6,18 +6,26 @@ switches and routers, running on **pfv-tsys4** (storage server).
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## Architecture
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```
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USB-DB9 adapters → udev symlinks (/dev/consoles/<name>) → conman (direct serial, logging + multiplexing)
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USB-DB9 adapters → udev symlinks (/dev/consoles/<name>) → ser2net telnet(rfc2217) TCP → conman (logging + multiplexing)
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```
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conman opens the serial devices directly via stable udev symlinks and
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provides session logging, output capture, and multi-user console
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sharing. Clients connect to conmand over the Tailscale interface
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(`100.70.77.93:7890`).
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ser2net owns the physical serial devices and exposes them on TCP ports
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using the **telnet(rfc2217) protocol** bound to the **Tailscale interface
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only** (`100.70.77.93:200X`). conman connects to those TCP ports via
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telnet for session logging, output capture, and multi-user console
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sharing.
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ser2net is installed but **disabled** — kept for emergency direct TCP
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access only (see [Emergency Access](#emergency-access) below). It must
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NOT run simultaneously with conmand (both would compete for the serial
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devices).
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**Why telnet(rfc2217)?** The serial devices send `
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␍` (LF+CR) line
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endings instead of standard `
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`. Raw TCP transport caused conman's
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telnet NVT to strip bare CR characters, producing stair-stepped output.
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With telnet(rfc2217) on both sides, binary mode is negotiated and CR/LF
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translation is handled correctly by the telnet layer.
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**conman and ser2net do NOT share ports** — only one process can open a
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serial device at a time. ser2net owns the physical device; conman connects
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over TCP.
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## The USB Enumeration Problem (SOLVED)
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@@ -50,8 +58,7 @@ ID_PATH. On subsequent boots, udev creates them automatically.
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| 2006 | subodev-torsw | usb-0:1.5.4.1 | Suborbital device TOR switch |
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| 2007 | pfv-r2-sw | usb-0:1.6.3.2 | Rack 2 old Dell switch |
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TCP ports are used by the ser2net emergency config only. conman accesses
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serial devices directly via `/dev/consoles/<name>` symlinks.
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All ports listen on the Tailscale IP (`100.70.77.93`) using telnet(rfc2217).
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## Scripts
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@@ -76,24 +83,19 @@ conman -d pfv-tsys4:7890 -q # list all consoles
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Escape sequence: `&.` to disconnect, `&?` for help.
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### Emergency Access
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If conmand is down or you need direct serial access:
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**Direct telnet (emergency only — conflicts with conman):**
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```bash
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# Option A — direct screen on pfv-tsys4:
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# Direct telnet to ser2net works ONLY when conmand is stopped, because
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# conmand maintains persistent connections to all 7 TCP ports. Use:
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ssh pfv-tsys4 'systemctl stop conmand'
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ssh pfv-tsys4 'screen /dev/consoles/pfv-core-sw01'
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ssh pfv-tsys4 'systemctl start conmand'
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# Option B — enable ser2net for TCP access:
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ssh pfv-tsys4 'systemctl stop conmand && systemctl start ser2net'
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telnet pfv-tsys4 2001 # pfv-core-sw01
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ssh pfv-tsys4 'systemctl stop ser2net && systemctl start conmand'
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ssh pfv-tsys4 'systemctl start conmand' # restart when done
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```
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**Never run ser2net and conmand at the same time** — both compete for the
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same serial devices.
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**Do NOT use telnet while conmand is running** — conmand will reconnect
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and kick your telnet session immediately ("Connection closed by foreign host").
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The correct workflow is conman client → conmand → ser2net → device.
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### Re-deploy after changing mapping.txt
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@@ -115,7 +117,7 @@ to `mapping.txt`.
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| File | Purpose |
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|------|---------|
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| `/etc/udev/rules.d/99-console-ports.rules` | Stable symlinks by ID_PATH |
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| `/etc/ser2net.yaml` | ser2net config (EMERGENCY ONLY — disabled by default) |
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| `/etc/ser2net.yaml` | ser2net config (telnet rfc2217 TCP ports → serial symlinks) |
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| `/etc/conman.conf` | conman config (CONSOLE entries between markers) |
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| `/etc/systemd/system/conmand.service` | systemd unit for conmand |
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| `/root/console/mapping.txt` | Copy of the source-of-truth mapping |
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+14
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@@ -143,24 +143,25 @@ fi
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{
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echo "%YAML 1.1"
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echo "---"
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echo "# ser2net configuration for pfv-tsys4 console ports (EMERGENCY USE ONLY)"
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echo "# ser2net configuration for pfv-tsys4 console ports"
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echo "# Generated by console/generate-config.sh on $(date)"
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echo "#"
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echo "# WARNING: ser2net is DISABLED by default. conman owns the serial"
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echo "# devices directly. If you enable ser2net, STOP conmand first or the"
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echo "# two will conflict (only one process can open a serial device at a time)."
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echo "# All ports use telnet(rfc2217) accepter so conman and telnet clients"
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echo "# negotiate proper telnet binary mode — this prevents CR stripping"
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echo "# and stair-stepping on devices that send \\n\\r (LF+CR) line endings."
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echo "# Ports bound to Tailscale IP ($TS_IP) for secure remote access."
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echo "#"
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echo "# Emergency workflow: systemctl stop conmand && systemctl start ser2net"
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echo "# When done: systemctl stop ser2net && systemctl start conmand"
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echo "# Direct telnet: telnet $TS_IP 2001"
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echo "# Via conman: conman -f <name>"
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echo ""
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echo "define: &banner \\r\\nPFV console port \\p device \\d [\\B]\\r\\n\\r\\n"
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echo ""
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for entry in "${ENTRIES[@]}"; do
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IFS='|' read -r tcp_port name id_path baud comment <<< "$entry"
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# ser2net connection block
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# ser2net connection block — telnet(rfc2217) accepter for proper NVT handling
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echo "connection: &con${tcp_port}"
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echo " accepter: tcp,${TS_IP},${tcp_port}"
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echo " accepter: telnet(rfc2217),tcp,${TS_IP},${tcp_port}"
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echo " enable: on"
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echo " options:"
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echo " banner: *banner"
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@@ -216,16 +217,14 @@ fi
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echo ""
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echo "$MARKER_BEGIN"
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echo "# Generated by console/generate-config.sh on $(date)"
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echo "# Each console connects directly to its serial device via the stable"
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echo "# udev symlink in /dev/consoles/. conman owns the serial devices"
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echo "# directly — no ser2net/telnet layer in the data path."
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echo "# Each console connects to a ser2net TCP port via telnet protocol."
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echo "# ser2net uses telnet(rfc2217) accepter so binary mode is negotiated"
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echo "# and CR/LF translation is handled correctly by the telnet NVT layer."
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echo "# Access: conman -f <name>"
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echo ""
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for entry in "${ENTRIES[@]}"; do
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IFS='|' read -r tcp_port name id_path baud comment <<< "$entry"
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# Convert baud format: mapping.txt uses 9600n81, conman needs 9600,8n1
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conman_seropts=$(echo "$baud" | sed -E 's/^([0-9]+)(.)(.)(.)$/\1,\3\2\4/')
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echo "CONSOLE name=\"${name}\" dev=\"/dev/consoles/${name}\" seropts=\"${conman_seropts}\" log=\"${name}.log\" logopts=\"timestamp\""
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echo "CONSOLE name=\"${name}\" dev=\"${TS_IP}:${tcp_port}\" log=\"${name}.log\" logopts=\"timestamp\""
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done
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echo "$MARKER_END"
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} >> "$CONMAN_CONF"
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@@ -247,7 +246,7 @@ echo " $CONMAN_CONF (CONSOLE entries appended between markers)"
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echo ""
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echo " Next steps:"
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echo " 1. Reload udev: udevadm control --reload-rules && udevadm trigger"
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echo " 2. Stop ser2net: systemctl stop ser2net && systemctl disable ser2net"
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echo " 2. Restart ser2net: systemctl restart ser2net"
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echo " 3. Start conman: systemctl enable --now conmand"
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echo " 4. Or run: bash $(basename "$0" .sh | sed 's/generate-config/setup/') .sh"
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echo "============================================"
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+32
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@@ -133,24 +133,35 @@ while IFS= read -r line; do
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fi
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done < "$MAPPING_FILE"
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# --- 5. Stop ser2net (conman owns serial devices directly) ---
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# --- 5. Restart ser2net ---
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echo ""
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echo "--- [5/7] Disabling ser2net ---"
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echo " conman now owns serial devices directly. ser2net must NOT run"
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echo " simultaneously (only one process can open a serial device at a time)."
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systemctl stop ser2net 2>/dev/null || true
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systemctl disable ser2net 2>/dev/null || true
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echo " ser2net stopped and disabled (available for emergency use)."
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echo "--- [5/7] Restarting ser2net ---"
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systemctl enable ser2net
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systemctl restart ser2net
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sleep 2
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if systemctl is-active --quiet ser2net; then
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echo " ser2net is running (telnet rfc2217 accepters)."
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TS_IP=$(tailscale ip -4 2>/dev/null || echo "127.0.0.1")
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echo " Listening ports:"
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ss -tlnp | grep ser2net | grep -oE "${TS_IP}:[0-9]+" | sort -t: -k2 -n | sed 's/^/ /'
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else
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echo " WARNING: ser2net failed to start. Checking journal..."
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journalctl -u ser2net --no-pager -n 20
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fi
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# --- 6. Enable + start conmand ---
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echo ""
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echo "--- [6/7] Starting conmand ---"
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# conman package on Debian may not ship a systemd unit. Create one if missing,
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# or update an existing one that still references ser2net.
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CONMAND_UNIT_BODY='[Unit]
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# conman package on Debian may not ship a systemd unit. Create one if missing.
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if ! systemctl cat conmand >/dev/null 2>&1; then
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echo " No systemd unit for conmand — creating one..."
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cat > /etc/systemd/system/conmand.service <<'CONMAND_UNIT'
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[Unit]
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Description=ConMan (Console Manager)
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After=network.target
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After=network.target ser2net.service
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Requires=ser2net.service
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[Service]
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Type=forking
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@@ -159,18 +170,10 @@ Restart=on-failure
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RestartSec=5
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[Install]
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WantedBy=multi-user.target'
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if ! systemctl cat conmand >/dev/null 2>&1; then
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echo " No systemd unit for conmand — creating one..."
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echo "$CONMAND_UNIT_BODY" > /etc/systemd/system/conmand.service
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WantedBy=multi-user.target
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CONMAND_UNIT
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systemctl daemon-reload
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echo " Created /etc/systemd/system/conmand.service"
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elif systemctl cat conmand 2>/dev/null | grep -q 'ser2net'; then
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echo " conmand unit has ser2net dependency — updating..."
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echo "$CONMAND_UNIT_BODY" > /etc/systemd/system/conmand.service
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systemctl daemon-reload
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echo " Updated /etc/systemd/system/conmand.service (removed ser2net dep)"
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fi
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# Kill any manually-started conmand first
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@@ -197,19 +200,21 @@ fi
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echo ""
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echo "--- [7/7] Setup complete ---"
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echo ""
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echo " conman owns serial devices directly (no ser2net in the data path)."
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echo " ser2net + conman architecture (telnet rfc2217):"
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echo " ser2net owns serial devices, exposes telnet(rfc2217) TCP ports"
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echo " conman connects via telnet for logging + multiplexing"
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echo ""
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echo " Connect from any Tailscale workstation:"
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echo " conman -d pfv-tsys4:7890 -f pfv-core-sw01"
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echo " conman -d pfv-tsys4:7890 -q # list consoles"
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echo ""
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echo " Emergency direct serial (must stop conmand first):"
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echo " systemctl stop conmand"
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echo " screen /dev/consoles/pfv-core-sw01"
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echo " systemctl start conmand"
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echo " Direct telnet (emergency, conflicts with conman):"
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echo " ssh pfv-tsys4 'systemctl stop conmand'"
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echo " telnet pfv-tsys4 2001"
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echo " ssh pfv-tsys4 'systemctl start conmand'"
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echo ""
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echo " To regenerate after changing mapping.txt:"
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echo " bash generate-config.sh"
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echo " udevadm trigger"
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echo " systemctl restart conmand"
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echo " systemctl restart ser2net conmand"
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echo "============================================"
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+16
-20
@@ -61,32 +61,28 @@ echo "--- 5. conmand connection status (journal) ---"
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journalctl -u conmand --no-pager -n 50 2>/dev/null | grep -iE "connect|error|fail|console|refused|timeout" | tail -15 || echo " (no relevant journal entries)"
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echo ""
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echo "--- 6. Verify serial devices are open by conmand ---"
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echo " Checking /dev/consoles/* are held by conmand..."
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echo "--- 6. Verify ser2net is proxying data (telnet rfc2217) ---"
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echo " Probing TCP $TS_IP:2007 for data..."
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RESPONSE=$(timeout 3 bash -c "printf '\r\r' | nc -w 2 $TS_IP 2007 2>/dev/null" | tr -cd '[:print:][:space:]' | head -5)
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if [ -n "$RESPONSE" ]; then
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echo " [OK] Data flowing through ser2net TCP 2007:"
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echo "$RESPONSE" | sed 's/^/ /'
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else
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echo " (no immediate response — device may need more interaction)"
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fi
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echo ""
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echo "--- 7. Check if conmand has open connections to ser2net ports ---"
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CONMAND_PID=$(pgrep -x conmand 2>/dev/null || echo "")
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if [ -n "$CONMAND_PID" ]; then
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echo " conmand PID: $CONMAND_PID"
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for devlink in /dev/consoles/*; do
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[ -e "$devlink" ] || continue
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name=$(basename "$devlink")
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if lsof "$devlink" 2>/dev/null | grep -q conmand; then
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echo " [OK] $name ($devlink) opened by conmand"
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else
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echo " [WARN] $name ($devlink) not held by conmand"
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fi
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done
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echo " Open connections to ser2net (expect 7 to 100.x:200X):"
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ss -tnp 2>/dev/null | grep "pid=$CONMAND_PID" | grep -oE "100\.[0-9.]+:200[0-9]" | sort | sed 's/^/ /'
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COUNT=$(ss -tnp 2>/dev/null | grep "pid=$CONMAND_PID" | grep -c ":200")
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echo " Total conmand→ser2net connections: $COUNT (expect 7)"
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else
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echo " [FAIL] conmand not running"
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fi
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echo ""
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echo "--- 7. Verify ser2net is stopped (conman owns devices) ---"
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if systemctl is-active --quiet ser2net 2>/dev/null; then
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echo " [WARN] ser2net is running — will conflict with conmand for serial devices!"
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echo " Fix: systemctl stop ser2net"
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else
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echo " [OK] ser2net is stopped (conman owns serial devices directly)"
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fi
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echo ""
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echo "============================================"
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Reference in New Issue
Block a user