7e93324288
- SPI_Bus_Lock: serialize LCD + SD on shared SPI; pause display during SD - SD_Init after WiFi scan; SD_IsReady gating; serial [SD]/[CAP] diagnostics - MUST_DO_IMPROVEMENTS.md full firmware review backlog; README link - Bump HANDSHAKE_FIRMWARE_VERSION to 1.0.2 (header) Made-with: Cursor
82 lines
5.1 KiB
Markdown
82 lines
5.1 KiB
Markdown
# Handshake Capture - ESP32-C6 1.47" LCD
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Production-oriented WiFi 4-way handshake capture for Waveshare ESP32-C6-LCD-1.47.
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**Firmware version:** `HANDSHAKE_FIRMWARE_VERSION` in `HandshakeCapture.h` (also printed on serial at boot).
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**Review backlog:** prioritized fixes from a full firmware pass → **`MUST_DO_IMPROVEMENTS.md`**.
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## Features
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- **SD required for capture:** No card, or open/write failure → pending PCAP is **discarded** and the slot freed (no infinite pending). Hot-insert: sketch retries `SD_Init()` before each capture round.
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- **SD storage:** Saves **only complete 4-way handshakes** as `.pcap` (LINKTYPE_IEEE802_11): `4way_<ssid>_<ms>_s<n>.pcap`. Filenames are **FAT-sanitized**. No PMKID-only or partial EAPOL dumps.
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- **Auto-deauth:** Bursts toward mapped clients to provoke a full 4-way.
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- **Display:** **Green** = targetable 2.4 GHz WPA/WPA2/WPA3 AP, **gray** = shown but skipped, **red** = 4-way saved to SD.
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- **No web UI:** Capture-only device.
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- **WPA / WPA2 / WPA3 PSK / mixed** (when the core reports them). Skips Open, WEP, WPA2-Enterprise.
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- **2.4 GHz only capture sweep:** channels `1-14` are targeted. Secure APs seen on `5/6 GHz` stay visible in the list but are marked `5G+` and skipped.
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- **BSSID cache:** Captured BSSIDs stay red across rescans.
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- **Shared SPI protection:** LCD flushes and SD filesystem calls now serialize on one bus lock; SD writes also pause LVGL updates for the duration of the transaction.
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**Convert:** `hcxpcapngtool` / Wireshark / aircrack-ng expect PCAP with EAPOL-Key frames; a full 4-way is included in each saved file (plus one target beacon when available).
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### “Partial” captures — what’s actually possible
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- **Not mergeable across random reconnects:** EAPOL messages from *different* 4-way runs (different nonces / MIC context) usually **cannot** be stitched into one crackable handshake. Tools need a **coherent** set for that AP↔STA association attempt.
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- **Within one visit, frames can trickle in:** While tuned to a channel, the device keeps **one PCAP buffer per target AP**. If the client reconnects several times during the same session, **all EAPOL frames append** until either four are seen (then SD save) or the channel round ends without four (buffer dropped — no file).
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- **EAPOL counting is still heuristic:** The firmware saves after **four unencrypted EAPOL-shaped frames** for that AP buffer, then stops counting. It still does **not** validate distinct message numbers, replay counters, or rekeys.
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- **Fewer than four frames:** Some attacks (e.g. **PMKID in message 1**, or classic **M1+M2** with beacon) need fewer frames, but this firmware **only saves on four** so every file aims to be a clean full 4-way for your earlier requirement.
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## Hardware
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- Waveshare ESP32-C6-LCD-1.47 (non-touch, ST7789)
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- TF card in onboard slot
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## Build & Flash
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Requires LVGL and lv_conf from the ESP32-C6-LCD-1.47-Demo:
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```bash
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cd "/path/to/4 way handshake"
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arduino-cli compile \
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-b 'esp32:esp32:esp32c6:PartitionScheme=huge_app' \
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--build-path /tmp/arduino-build-handshake-c6 \
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--libraries "ESP32-C6-LCD-1.47-Demo/Arduino/libraries" \
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handshake-capture-c6
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```
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```bash
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arduino-cli upload \
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-p /dev/cu.usbmodem* \
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-b 'esp32:esp32:esp32c6:PartitionScheme=huge_app' \
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--input-dir /tmp/arduino-build-handshake-c6
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```
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Use `arduino-cli board list` to find the correct port.
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For bench builds, set `HANDSHAKE_DEBUG 1` in `HandshakeCapture.h` to restore verbose serial logs. `USE_SOFTAP` defaults to `0`; only turn it on for lab experiments where you explicitly want `WIFI_AP_STA`.
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## Flow
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1. Boot → scan → display networks (`green` targetable, `gray` skipped)
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2. Channel sweep + **up to 2 WPA APs at a time** on that channel; **map clients → deauth burst → listen** (several rounds per visit)
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3. PCAP grows in RAM; **SD write only when 4 EAPOL-Key frames** are seen for that AP
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4. On save → mark red; **refill slots** with other networks on the same channel, then **next channel** until everyone captured or timed out
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5. If a visit ends without 4 EAPOL for an AP, that buffer is discarded (no partial PCAP); the next sweep can try again
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6. Mid-capture rescans are intentionally not exposed in the UI; if you add one later, stop capture first and clear active slots before rebuilding `networks[]`
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## Production checklist
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| Item | Notes |
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|------|--------|
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| **Flash layout** | Prefer `PartitionScheme=huge_app` (~40% of that partition at v1.0.0); default `default` partition is too small (~96% full). |
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| **SD** | FAT-formatted microSD; capture is gated on `SD_IsReady()` (successful `SD_Init`), not raw `cardType()` (unreliable after WiFi on shared SPI). |
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| **Serial** | `115200` — boot line shows `handshake-capture-c6 vX.Y.Z`. |
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| **Legal / authorization** | Only deploy on networks you own or have **explicit written permission** to test. Unauthorized interception or disruption is illegal in many jurisdictions. |
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## Release discipline
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1. Bump `HANDSHAKE_FIRMWARE_VERSION` in `HandshakeCapture.h` for any field release.
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2. Rebuild with the same `arduino-cli` FQBN and partition scheme you ship.
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3. Run a short on-bench test: scan → capture → confirm `.pcap` opens in Wireshark and shows four EAPOL-Key exchanges for the target BSSID.
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