version 5.1.0

.gitea/workflows/release.yml

@@ -39,7 +39,7 @@ jobs:
           TWINE_USERNAME: ${{ secrets.PYPI_USERNAME }}
           TWINE_PASSWORD: ${{ secrets.PYPI_TOKEN }}
         run: |
-          twine upload --repository-url https://git.wrede.ca/api/packages/andreas/pypi dist/*
+          python -m twine upload --repository-url https://git.wrede.ca/api/packages/andreas/pypi dist/*
 
       - name: Create release
         uses: actions/gitea-release-action@v1

.gitignore

@@ -11,3 +11,4 @@ dist/
 *.egg-info/
 ssl/
 uv.lock
+.hb.yaml

.hb.yaml

@@ -1,255 +0,0 @@
-#name: "w02"
-hb_port: 50003   
-hbd_host: ''
-#logfile: "/home/andreas/public_html/messages/andreas"
-logfile: "/home/andreas/logs/heartbeat/heartbeat.log"
-#logfile: "/Users/andreas/public_html/messages/andreas"
-logfmt: "msg"
-grace: 40
-interval: 10
-autosave_interval: 300  # Autosave interval in seconds (default: 5 minutes)
-
-# Notification Channels - Define notification providers centrally
-# Each channel has a type (pushover, email, signal, mattermost) and type-specific configuration
-notification_channels:
-
-  pushover_standard:
-    type: pushover
-    token: ac7NLX2rPjXFareeDgLpXNoDf4iFmf
-    user: uDhH33UjQQDYtNzJb1ThRiWb9ingGK
-
-  signal_andreas:
-    type: signal
-    cli_path: /usr/local/bin/signal-cli
-    user: +14168226179
-    recipient: +14168226179
-  
-  email_andreas:
-    type: email
-    recipients: [aew.hbd.notify@wrede.ca]
-    sender: aew.hbd@wrede.ca
-    smtp_server: smtp.fastmail.com
-    smtp_port: 587
-    smtp_user: andreas@wrede.ca
-    smtp_password: pvtvefyp5gbhnch2
-  
-  # Example additional channels (commented out)
-  # pushover_urgent:
-  #   type: pushover
-  #   token: your-app-token
-  #   user: your-user-key
-  #
-  mattermost_devops:
-    type: mattermost
-    host: mattermost.example.com
-    token: webhook-token
-    channel: devops-alerts
-    username: heartbeat-bot
-    icon: https://example.com/heartbeat-icon.png
-
-# Default notification channels (used if host doesn't specify channels)
-default_notification_channels: [pushover_standard]
-
-# Host definitions - combines threshold mapping, watch status, DNS updates, and notifications
-hosts:
-  wentworth:
-    threshold_config: default
-    watch: true
-    notification_channels: [pushover_standard]
-    dyndns: false
-  
-  y:
-    threshold_config: default
-    watch: true
-    notification_channels: [pushover_standard]
-    dyndns: false
-  
-  winter:
-    threshold_config: default
-    watch: true
-    notification_channels: [pushover_standard]
-    dyndns: false
-  
-  wally:
-    threshold_config: freebsd_server
-    watch: false
-    notification_channels: [pushover_standard]
-    dyndns: false
-  
-  eris:
-    threshold_config: truenas_server
-    watch: false
-    notification_channels: [pushover_standard]
-    dyndns: false
-  
-  haschloss:
-    threshold_config: default
-    watch: false
-    dyndns: true
-  
-  wayback:
-    threshold_config: default
-    watch: false
-    notification_channels: [pushover_standard]
-    dyndns: true
-  
-  wertvoll:
-    threshold_config: default
-    watch: false
-    notification_channels: [pushover_standard]
-    dyndns: true
-  
-  weekend:
-    threshold_config: freebsd_server
-    watch: false
-    notification_channels: [pushover_standard]
-    dyndns: true
-  
-  cotgate:
-    threshold_config: default
-    watch: false
-    dyndns: true
-  
-  rvgate:
-    threshold_config: default
-    watch: false
-    dyndns: true
-  
-  draper:
-    threshold_config: default
-    watch: false
-    notification_channels: [pushover_standard]
-    dyndns: true
-
-# Hosts to drop/ignore
-drophosts: {"unknown", "wookie15", "wort"}
-
-nsupdate_bin: "/usr/local/bin/nsupdate"
-
-dyndomains: {"wrede.org"}
-
-ws_port: 50005
-# wss_port: 50006  # Commented out - use plain WebSocket instead of secure WSS
-# cert_path: "/usr/local/etc/letsencrypt/live/hbd.wrede.ca/"
-# cert_path: "test/"
-# CERT_PATH = "./test/"
-# wss_pem: "fullchain.pem"
-# wss_key: "privkey.pem"
-
-journal_enabled: true                    # Enable/disable journaling
-journal_dir: /home/andreas/logs/heartbeat         # Journal directory
-journal_file: messages.journal           # Base filename
-journal_max_size: 104857600             # Max size (100MB default)
-journal_max_backups: 10                 # Number of backups to keep
-
-threshold_configs:
-  default:
-    thresholds:
-      cpu_monitor:
-        cpu_percent:
-          warning: 80.0
-          critical: 90.0
-      memory_monitor:
-        percent:
-          warning: 85.0
-          critical: 95.0
-      disk_monitor:
-        partitions:
-          /:
-            percent:
-              warning: 85.0
-              critical: 90.0
-      rtt:
-        warning: 200
-        critical: 250.0
-
-
-  freebsd_server:
-    thresholds:
-      cpu_monitor:
-        cpu_percent:
-          warning: 80.0
-          critical: 90.0
-      memory_monitor:
-        memory_percent:
-          warning: 97.0
-          critical: 100.0
-      disk_monitor:
-        partitions:
-          /:
-            percent:
-              warning: 85.0
-              critical: 90.0
-      nagios_runner:
-   #     overall_status_code:
-   #       warning: 1
-   #       critical: 2
-   #       operator: ">="
-        load_status:
-          warning: WARNING
-          critical: CRITICAL
-          operator: "=="
-        ups_load:
-          display: "load to high: {ups_output}"
-          warning: 70
-          critical: 80
-          operator: ">="
-        ups_status_code:
-          display: "{ups_output}"
-          warning: 1
-          critical: 2
-          operator: ">="
-        nextcloud_apps_status_code:
-          display: "{nextcloud_apps_output}"
-          warning: 1
-          critical: 2
-          operator: ">="
-      rtt:
-        warning: 200
-        critical: 250.0
-
-  truenas_server:
-    thresholds:
-      cpu_monitor:
-        cpu_percent:
-          warning: 80.0
-          critical: 90.0
-      memory_monitor:
-        percent:
-          warning: 3.0
-          critical: 95.0
-      disk_monitor:
-        partitions:
-          /:
-            percent:
-              warning: 85.0
-              critical: 90.0
-      nagios_runner:
-   #     overall_status_code:
-   #       warning: 1
-   #       critical: 2
-   #       operator: ">="
-        load_status:
-          warning: WARNING
-          critical: CRITICAL
-          operator: "=="
-        ups_load:
-          display: "load to high: {ups_output}"
-          WARNING: 70
-          CRITICAL: 80
-          OPERATOR: ">="
-        ups_status_code:
-          DISPLAY: "{ups_output}"
-          warning: 1
-          critical: 2
-          operator: ">="
-        nextcloud_apps_status_code:
-          display: "{nextcloud_apps_output}"
-          warning: 1
-          critical: 2
-          operator: ">="
-      rtt:
-        warning: 120
-        critical: 250.0
-
-

.vscode/launch.json

@@ -4,12 +4,13 @@
   // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
   "version": "0.2.0",
   "configurations": [
+
     {
       "name": "Python: Run hbd (module)",
       "type": "debugpy",
       "request": "launch",
       "module": "hbd.server.cli",
-      "args": ["-c", "/home/andreas/git/heartbeat/.hb.yaml", "-f", "-v", "-x", "-x", "-x", "-x"],
+      "args": ["-c", "~/.hb.yaml", "-f", "-v"],
       "cwd": "${workspaceFolder}",
       "env": {
         "PYTHONPATH": "${workspaceFolder}"
@@ -28,14 +29,14 @@
       ]
     },
     {
-      "name": "Python: Run hbd with debugpy (listen)",
+      "name": "Python: Run hbc (module)",
       "type": "debugpy",
       "request": "launch",
-      "module": "debugpy",
-      "args": ["--listen", "5678", "--wait-for-client", "-m", "hbd.server.cli", "-c", ".hb.yaml", "-f", "-v"],
+      "module": "hbd.client.main",
+      "args": ["-c", "~/.hbc.yaml",  "-v", "winter"],
+      "cwd": "${workspaceFolder}",
       "env": { "PYTHONPATH": "${workspaceFolder}" },
       "console": "integratedTerminal",
-      "justMyCode": false
     }
   ]
 }

README.md

@@ -11,8 +11,13 @@ A lightweight daemon that listens for UDP heartbeat messages and acts on them: k
 - Queue DNS updates via `nsupdate` and run them in a background thread ✅
 - WebSocket API for live updates (hosts & messages) ✅
 - Notification pipeline (email, Pushover, Mattermost, Signal) ✅
+- **User management & access control** ✅
+  - Optional user accounts with bcrypt-style password hashing (stdlib only)
+  - Per-host roles: owner, manager, monitor
+  - Session-based auth with cookie support (browser login page included)
+  - Backwards compatible: no auth required when no users are configured
 - **HTTP API & Web UI** ✅
-  - REST API for plugin data, alerts, and host information
+  - REST API for plugin data, alerts, host information, and user management
   - Live dashboard with WebSocket updates
   - Interactive plugin metrics visualization
   - Alerts dashboard with filtering and summaries
@@ -71,7 +76,7 @@ See [docs/NAGIOS_INTEGRATION.md](docs/NAGIOS_INTEGRATION.md) for complete integr
 ### Creating Custom Plugins
 
 ```python
-from hbd.plugin import MonitorPlugin
+from hbd.client.plugin import MonitorPlugin
 
 class DiskMonitorPlugin(MonitorPlugin):
     name = "disk_monitor"
@@ -84,7 +89,7 @@ class DiskMonitorPlugin(MonitorPlugin):
         }
 ```
 
-Place plugins in `hbd/plugins/` and they'll be automatically discovered and loaded by the client.
+Place plugins in `hbd/client/plugins/` and they'll be automatically discovered and loaded by the client.
 
 ---
 
@@ -266,77 +271,93 @@ See [docs/THRESHOLD_ALERTING.md](docs/THRESHOLD_ALERTING.md) for comprehensive d
 
 ---
 
+## 👥 User Management
+
+Heartbeat supports optional user accounts with role-based access control per host.
+
+### Roles
+
+- **monitor** — view status, plugin data, alerts
+- **manager** — monitor + queue commands, trigger DNS, queue upgrades
+- **owner** — manager + drop host, transfer ownership, update access
+- **admin** (user flag) — owner-level access on every host
+
+When no users are configured the server runs in **unauthenticated mode** — all existing behaviour is unchanged.
+
+### Quick setup
+
+```yaml
+users:
+  alice:
+    full_name: Alice Smith
+    password: pbkdf2:sha256:...    # hbd passwd alice
+    admin: true
+
+default_owner: alice
+
+hosts:
+  webserver01:
+    owner: alice
+    managers: [bob]
+    monitors: [carol]
+```
+
+```bash
+# Generate a password hash
+hbd passwd alice
+```
+
+Browser users are redirected to `/login` automatically. The session cookie is set on login, so `fetch()` calls from dashboards work without any JavaScript changes.
+
+See [docs/USERS.md](docs/USERS.md) for complete user management documentation.
+
+---
+
 ## 🌐 HTTP API & Web UI
 
 Heartbeat includes a built-in HTTP/WebSocket server that provides both a REST API and web-based dashboards for monitoring and visualization.
 
 ### Features
 
-- **REST API**: JSON endpoints for accessing plugin data, alerts, and host information
+- **User auth**: Optional session-based authentication with per-host role enforcement
+- **REST API**: JSON endpoints for accessing plugin data, alerts, host information, and user management
 - **Live Dashboard**: Real-time WebSocket-powered host status view
 - **Plugin Metrics**: Interactive visualization of all plugin data with auto-refresh
 - **Alerts Dashboard**: Comprehensive alert monitoring with filtering and summaries
-- **CORS Support**: Configurable for integration with external applications
 
 ### Web Dashboards
 
-- **Live View** (`/live`): Real-time host connectivity, latency, and messages  
-- **Plugin Metrics** (`/plugins`): Browse and visualize metrics from all plugins  
-- **Alerts Dashboard** (`/alerts`): Monitor active alerts with severity filtering  
+- **Login** (`/login`): Browser login form (shown automatically when auth is configured)
+- **Live View** (`/live`): Real-time host connectivity, latency, and messages
+- **Plugin Metrics** (`/plugins`): Browse and visualize metrics from all plugins
+- **Alerts Dashboard** (`/alerts`): Monitor active alerts with severity filtering
 
 ### API Endpoints
 
 ```bash
+# Log in (when auth is configured)
+TOKEN=$(curl -s -X POST http://localhost:50004/api/0/auth/login \
+  -H 'Content-Type: application/json' \
+  -d '{"username":"alice","password":"secret"}' | jq -r .token)
+AUTH="-H \"Authorization: Bearer $TOKEN\""
+
 # List all monitored hosts
-curl http://localhost:50004/api/0/hosts
+curl $AUTH http://localhost:50004/api/0/hosts
 
 # Get all plugin data for a host
-curl http://localhost:50004/api/0/hosts/webserver01/plugins
+curl $AUTH http://localhost:50004/api/0/hosts/webserver01/plugins
 
 # Get detailed plugin history (last 50 samples)
-curl http://localhost:50004/api/0/hosts/webserver01/plugins/cpu_monitor?limit=50
+curl $AUTH "http://localhost:50004/api/0/hosts/webserver01/plugins/cpu_monitor?limit=50"
 
 # Get alert states for a specific host
-curl http://localhost:50004/api/0/hosts/webserver01/alerts
+curl $AUTH http://localhost:50004/api/0/hosts/webserver01/alerts
 
 # Get all active alerts across all hosts
-curl http://localhost:50004/api/0/alerts
-```
+curl $AUTH http://localhost:50004/api/0/alerts
 
-### Integration Examples
-
-**Python Client:**
-```python
-import requests
-
-# Monitor for critical alerts
-response = requests.get('http://localhost:50004/api/0/alerts')
-alerts = response.json()
-
-if alerts['summary']['critical'] > 0:
-    print(f"⚠️ {alerts['summary']['critical']} CRITICAL alerts!")
-    for alert in alerts['alerts']:
-        if alert['level'] == 'CRITICAL':
-            print(f"  {alert['hostname']}: {alert['metric_path']} = {alert['last_value']}")
-```
-
-**Bash Monitoring Script:**
-```bash
-#!/bin/bash
-# Check for critical alerts
-CRITICAL=$(curl -s http://localhost:50004/api/0/alerts | jq '.summary.critical')
-if [ "$CRITICAL" -gt 0 ]; then
-    echo "CRITICAL: $CRITICAL critical alerts detected!"
-    # Send notification
-fi
-```
-
-### Demo & Testing
-
-Run the API demo script to test all endpoints:
-
-```bash
-python3 scripts/demo_http_api.py
+# View/update host access roles
+curl $AUTH http://localhost:50004/api/0/hosts/webserver01/access
 ```
 
 See [docs/HTTP_API.md](docs/HTTP_API.md) for complete API documentation including response formats, error handling, and integration examples.
@@ -347,7 +368,7 @@ See [docs/HTTP_API.md](docs/HTTP_API.md) for complete API documentation includin
 
 Prerequisites:
 
-- Python 3.10+ (project uses language features from recent Python)
+- Python 3.11+ (project uses language features from recent Python)
 - `nsupdate` (for DNS updates) if using dynamic DNS
 
 Install dependencies (recommended into a venv):
@@ -368,7 +389,7 @@ hbd -c .hb.yaml -f -v
 You can also run it directly via the package entrypoint after installation:
 
 ```bash
-python -m hbd.cli -c /path/to/config.yaml
+python -m hbd.server.cli -c /path/to/config.yaml
 ```
 
 ### Running the Client
@@ -376,14 +397,23 @@ python -m hbd.cli -c /path/to/config.yaml
 The heartbeat client (`hbc`) sends periodic heartbeats and plugin data to the server:
 
 ```bash
-# Basic usage pointing to server
-python -m hbd.hbc --server your-server.example.com
+# Basic usage pointing to server (host is a positional argument)
+hbc your-server.example.com
 
-# With custom configuration
-python -m hbd.hbc --server 192.168.1.100 --port 50003 --interval 30
+# Run as daemon with a config file
+hbc -d -c /etc/hbc.yaml your-server.example.com
 
-# Run with specific plugins enabled/disabled
-python -m hbd.hbc --server hbd.local --disable-plugin os_info
+# Send a one-off boot message
+hbc --boot your-server.example.com
+
+# Verbose output
+hbc -v your-server.example.com
+```
+
+You can also run it via the module entrypoint:
+
+```bash
+python -m hbd.client.main your-server.example.com
 ```
 
 Client configuration can also be specified in YAML:
@@ -417,30 +447,29 @@ This repository includes a ready-to-use `.vscode/launch.json` with configuration
 
 - Ensure the **Python** extension is installed and select the project `.venv` as the interpreter (bottom-left of VS Code).
 - Use **F5** and pick one of these configurations from the Run view:
-  - **Python: Run hbd (module)** — runs `hbd.cli` as a module and sets `PYTHONPATH` to the workspace root (recommended).
+  - **Python: Run hbd (module)** — runs `hbd.server.cli` as a module and sets `PYTHONPATH` to the workspace root (recommended).
   - **Python: Run hbd with debugpy (listen)** — launches `debugpy` and `hbd` together; useful when you want the process to listen for a debugger.
   - **Python: Attach (localhost:5678)** — attach the debugger to a running process started with `debugpy`.
 
 To start `hbd` manually and wait for the debugger to attach, run:
 
 ```bash
-PYTHONPATH=. python -m debugpy --listen 5678 --wait-for-client -m hbd.cli -c .hb.yaml -f -v
+PYTHONPATH=. python -m debugpy --listen 5678 --wait-for-client -m hbd.server.cli -c .hb.yaml -f -v
 ```
 
-Set breakpoints in modules such as `hbd/udp.py`, `hbd/dns.py`, or `hbd/server.py`, and use the **Attach** configuration to connect. Use `justMyCode: false` if you need to step into third-party code.
+Set breakpoints in modules such as `hbd/server/udp.py`, `hbd/server/dns.py`, or `hbd/server/main.py`, and use the **Attach** configuration to connect. Use `justMyCode: false` if you need to step into third-party code.
 
 ---
 
 ## 🛠 Configuration
 
-`hbd` reads YAML configuration (optional). If `PyYAML` is not installed, built-in defaults are used. Example configuration keys (see `hbd/config.py`):
+`hbd` reads YAML configuration (optional). If `PyYAML` is not installed, built-in defaults are used. Example configuration keys (see `hbd/server/config.py`):
 
 - `hb_port`: UDP port to listen for heartbeats (default: 50003)
 - `hbd_port`: internal control port (default: 50004)
 - `hbd_host`: bind address for HTTP/WSS
 - `pickfile`: path for persisted state
 - `logfile`: path to log file
-- `logfmt`: `text` or `msg`
 - `pushsrv`: push service (`pushover`|`mattermost`|`all`)
 - `interval` / `grace`: heartbeat timing configuration
 - `dyndomains`: list of dyndomains to update via `nsupdate`
@@ -452,6 +481,8 @@ Set breakpoints in modules such as `hbd/udp.py`, `hbd/dns.py`, or `hbd/server.py
 - `cert_path`: directory where TLS certificate and key are looked up (default: /usr/local/etc/ssl/)
 - `wss_pem`: filename for the certificate chain (default: fullchain.pem)
 - `wss_key`: filename for the private key (default: privkey.pem)
+- `users`: mapping of username → user attributes (full_name, avatar, password, admin, notification_channels)
+- `default_owner`: username that owns hosts with no explicit owner (falls back to first admin user)
 
 Example `.hb.yaml` (minimal):
 
@@ -464,29 +495,39 @@ nsupdate_bin: /usr/bin/nsupdate
 pushsrv: pushover
 ```
 
-> Tip: `config.DEFAULTS` in `hbd/config.py` contains the canonical defaults and accepted configuration keys.
+> Tip: `SERVER_DEFAULTS` in `hbd/server/config.py` contains the canonical defaults and accepted configuration keys.
 
 ---
 
 ## 🔧 Architecture & Modules
 
-- `hbd.proto` — serialization/deserialization of heartbeat messages (supports compressed payloads and plugin data)
-- `hbd.udp` — UDP parsing and `handle_datagram` implementation (main state machine)
-- `hbd.dns` — `create_nsupdate_payload`, `nsupdate`, and an asyncio DNS worker (`start_dns_worker`).
-  The DNS worker now runs as an `asyncio` task and the package exposes a
-  small thread-safe bridge so legacy synchronous code can `put()` updates
-  into the queue; there is no longer a permanently-blocking background
-  `threading.Thread`.
-- `hbd.notify` — email and push notification helpers
-- `hbd.ws` — WebSocket server and thread-safe broadcast helpers
-- `hbd.http` — HTTP handler factory for the status UI/API
-- `hbd.journal` — message journal with size-based log rotation and backup management
-- `hbd.plugin` — plugin framework with base classes, registry, and dynamic loader
-- `hbd.plugins/` — built-in plugins (os_info, cpu_monitor, memory_monitor, disk_monitor, network_monitor, filesystem_info, nagios_runner)
-- `hbd.hbc` — heartbeat client that sends heartbeats and plugin data to server
-- `hbd.utils` — small utility helpers (`shortname`, `dur`, `initlog`)
-- `hbd.cli` — CLI entrypoint and argument parsing
-- `hbd.server` — async orchestration to run UDP/HTTP/WSS components
+The package is organized into three subpackages:
+
+**`hbd.common`** — shared code used by both client and server:
+- `hbd.common.proto` — serialization/deserialization of heartbeat messages (supports compressed payloads and plugin data)
+- `hbd.common.utils` — small utility helpers (`shortname`, `dur`, `initlog`)
+
+**`hbd.server`** — the heartbeat daemon (`hbd`):
+- `hbd.server.cli` — CLI entrypoint and argument parsing
+- `hbd.server.main` — async orchestration to run UDP/HTTP/WSS components
+- `hbd.server.udp` — UDP parsing and `handle_datagram` implementation (main state machine)
+- `hbd.server.dns` — `create_nsupdate_payload`, `nsupdate`, and an asyncio DNS worker (`start_dns_worker`).
+  The DNS worker runs as an `asyncio` task and the package exposes a small thread-safe bridge
+  so legacy synchronous code can `put()` updates into the queue.
+- `hbd.server.notify` — email and push notification helpers
+- `hbd.server.ws` — WebSocket server and thread-safe broadcast helpers
+- `hbd.server.http` — HTTP handler factory for the status UI/API
+- `hbd.server.journal` — message journal with size-based log rotation and backup management
+- `hbd.server.threshold` — threshold alerting engine
+- `hbd.server.monitor` — host state monitoring
+- `hbd.server.hbdclass` — `Host` class and shared server state
+- `hbd.server.config` — configuration loader and defaults
+
+**`hbd.client`** — the heartbeat client (`hbc`):
+- `hbd.client.main` — client entrypoint; sends heartbeats and plugin data to the server
+- `hbd.client.plugin` — plugin framework with base classes, registry, and dynamic loader
+- `hbd.client.plugins/` — built-in plugins (os_info, cpu_monitor, memory_monitor, disk_monitor, network_monitor, filesystem_info, nagios_runner)
+- `hbd.client.config` — client configuration loader
 
 This modular layout makes the code easier to test and maintain.
 
@@ -494,12 +535,12 @@ This modular layout makes the code easier to test and maintain.
 
 - The main runtime is asyncio-based. Services (UDP listener, HTTP server, WebSocket server, monitor, and DNS worker) run as asyncio tasks.
 - On SIGINT/SIGTERM the server triggers a graceful shutdown: it cancels active tasks, signals the DNS worker via a sentinel, and cleans up resources before exit.
-- The DNS update worker is implemented as an `asyncio` task; synchronous producers can still enqueue DNS updates via a small thread-safe bridge available at `hbd.hbdclass.Host.dnsQ`.
+- The DNS update worker is implemented as an `asyncio` task; synchronous producers can still enqueue DNS updates via a small thread-safe bridge available at `hbd.server.hbdclass.Host.dnsQ`.
 
 **Templates & Static Files**
 
-- Template files are located under `hbd/templates` by default. The HTTP server resolves templates relative to the `hbd` package but the path can be overridden with the `templates_dir` config key.
-- Static assets (CSS/JS/images) are served from `hbd/static` via the `/static/<path>` HTTP route. Place your static files in that directory or configure the HTTP server as needed.
+- Template files are located under `hbd/server/templates`. The HTTP server resolves templates relative to the `hbd.server` package but the path can be overridden with the `templates_dir` config key.
+- Static assets (CSS/JS/images) are served from `hbd/server/static` via the `/static/<path>` HTTP route.
 
 ---
 

REFACTORING.md

@@ -59,7 +59,7 @@ Server-specific defaults:
 - `hb_port`: Port to listen for heartbeats (default: 50003)
 - `hbd_port`: HTTP API port (default: 50004)
 - `ws_port`: WebSocket port (default: 50005)
-- `logfile`, `logfmt`: Logging configuration
+- `logfile`: Log file path
 - `pushsrv`, `pushover_token`, etc.: Notification settings
 - `watchhosts`, `dyndnshosts`: Host monitoring
 - `smtpserver`, etc.: Email settings

docs/CONFIG_RELOAD.md

@@ -81,7 +81,6 @@ The following settings **cannot** be reloaded and require a service restart:
 
 - **Logging**
   - `logfile` - Log file path
-  - `logfmt` - Log format
 
 - **Journal Settings**
   - `journal_enabled` - Enable/disable journaling

docs/HTTP_API.md

@@ -15,12 +15,49 @@ Default port is `50004` (configurable via `hbd_port` in configuration).
 
 ---
 
+## Authentication
+
+When [user accounts are configured](USERS.md), every request must be authenticated.
+
+- **Browser requests** to HTML pages are redirected to `/login` automatically.  JavaScript `fetch()` calls on the dashboards send the session cookie automatically — no JS changes are needed.
+- **API / programmatic requests** must include the token in an `Authorization: Bearer <token>` header or an `X-Auth-Token` header.
+
+Unauthenticated API requests receive `401 Unauthorized`.  When no users are configured the server runs in unauthenticated mode and all endpoints are open.
+
+### Login
+
+```bash
+TOKEN=$(curl -s -X POST http://localhost:50004/api/0/auth/login \
+  -H 'Content-Type: application/json' \
+  -d '{"username":"alice","password":"secret"}' | jq -r .token)
+
+curl -H "Authorization: Bearer $TOKEN" http://localhost:50004/api/0/hosts
+```
+
+See [User Management](USERS.md) for full authentication documentation.
+
+---
+
 ## API Endpoints
 
+### Authentication
+
+| Method | Path | Description | Auth required |
+|--------|------|-------------|---------------|
+| `POST` | `/api/0/auth/login` | Obtain session token | No |
+| `POST` | `/api/0/auth/logout` | Invalidate session | Token |
+
+### Users
+
+| Method | Path | Description | Role |
+|--------|------|-------------|------|
+| `GET` | `/api/0/users` | List all users | Admin |
+| `GET` | `/api/0/users/me` | Own profile | Authenticated |
+
 ### Host Management
 
 #### GET /api/0/hosts
-Get list of all monitored hosts with their state information.
+Get list of all monitored hosts with their state information.  When auth is enabled, only hosts the caller has at least **monitor** access to are returned.
 
 **Response:**
 ```json
@@ -28,6 +65,9 @@ Get list of all monitored hosts with their state information.
   {
     "name": "webserver01",
     "dyn": false,
+    "owner": "alice",
+    "managers": ["bob"],
+    "monitors": ["carol"],
     "connections": [...]
   }
 ]
@@ -137,6 +177,32 @@ curl http://localhost:50004/api/0/hosts/database01/plugins/disk_monitor
 
 ---
 
+### Host Access
+
+#### GET /api/0/hosts/{hostname}/access
+Get owner/managers/monitors for a host. Requires **monitor** role or higher.
+
+**Response:**
+```json
+{
+  "owner": "alice",
+  "managers": ["bob"],
+  "monitors": ["carol"]
+}
+```
+
+#### PUT /api/0/hosts/{hostname}/access
+Update owner/managers/monitors. Requires **owner** role or admin.
+
+**Request body** (all fields optional):
+```json
+{ "owner": "bob", "managers": ["carol"], "monitors": [] }
+```
+
+Changes take effect immediately but are not written back to the config file. Update the config file and send `SIGHUP` to make them permanent.
+
+---
+
 ### Alert Endpoints
 
 #### GET /api/0/hosts/{hostname}/alerts
@@ -226,6 +292,16 @@ curl http://localhost:50004/api/0/alerts | jq .
 
 ## Web UI Pages
 
+### Login
+**URL:** `/login`
+
+Shown automatically when a browser request is made without a valid session (when users are configured). After successful login the browser is redirected to the originally requested page.
+
+### Logout
+**URL:** `/logout`
+
+Clears the session cookie and redirects to `/login`.
+
 ### Live Dashboard
 **URL:** `/live`
 
@@ -288,7 +364,13 @@ Comprehensive alert monitoring:
 #!/bin/bash
 # Check for critical alerts and send notification
 
-RESPONSE=$(curl -s http://localhost:50004/api/0/alerts)
+# Log in first (when auth is configured)
+TOKEN=$(curl -s -X POST http://localhost:50004/api/0/auth/login \
+  -H 'Content-Type: application/json' \
+  -d '{"username":"monitor","password":"secret"}' | jq -r .token)
+AUTH="-H \"Authorization: Bearer $TOKEN\""
+
+RESPONSE=$(curl -s $AUTH http://localhost:50004/api/0/alerts)
 CRITICAL_COUNT=$(echo "$RESPONSE" | jq '.summary.critical')
 
 if [ "$CRITICAL_COUNT" -gt 0 ]; then
@@ -305,8 +387,16 @@ fi
 import requests
 import json
 
+BASE = 'http://localhost:50004'
+
+# Log in (skip if auth not configured)
+resp = requests.post(f'{BASE}/api/0/auth/login',
+                     json={"username": "alice", "password": "secret"})
+token = resp.json().get("token")
+headers = {"Authorization": f"Bearer {token}"} if token else {}
+
 # Get all plugin data for a host
-response = requests.get('http://localhost:50004/api/0/hosts/webserver01/plugins')
+response = requests.get(f'{BASE}/api/0/hosts/webserver01/plugins', headers=headers)
 data = response.json()
 
 print(f"Host: {data['hostname']}")
@@ -318,7 +408,7 @@ for plugin, info in data['plugins'].items():
         print(f"  {metric}: {value}")
 
 # Check for alerts
-response = requests.get('http://localhost:50004/api/0/alerts')
+response = requests.get(f'{BASE}/api/0/alerts', headers=headers)
 alerts = response.json()
 
 if alerts['summary']['critical'] > 0:
@@ -389,6 +479,8 @@ API errors return appropriate HTTP status codes with JSON:
 **Common Status Codes:**
 - `200 OK` - Success
 - `400 Bad Request` - Invalid parameters
+- `401 Unauthorized` - Missing or invalid session token
+- `403 Forbidden` - Authenticated but insufficient role
 - `404 Not Found` - Resource not found
 - `500 Internal Server Error` - Server error
 
@@ -506,6 +598,14 @@ for route in list(app.router.routes()):
 
 ## Troubleshooting
 
+### API Returns 401
+- Auth is configured — include `Authorization: Bearer <token>` header
+- Token may have expired (24 h TTL) — log in again
+
+### API Returns 403
+- Authenticated user lacks the required role for this host/action
+- Check host's `owner`, `managers`, `monitors` config
+
 ### API Returns 404
 - Verify hostname in URL matches actual host name
 - Check host is sending heartbeats: `curl http://localhost:50004/api/0/hosts`
@@ -525,6 +625,7 @@ for route in list(app.router.routes()):
 
 ## See Also
 
+- [User Management](USERS.md)
 - [Plugin Development Guide](PLUGIN_DEVELOPMENT.md)
 - [Threshold Alerting Documentation](THRESHOLD_ALERTING.md)
 - [Message Journal Documentation](MESSAGE_JOURNAL.md)

docs/USERS.md

@@ -0,0 +1,242 @@
+# User Management
+
+Heartbeat supports optional user accounts with role-based access control per host. When no users are configured the server runs in **unauthenticated mode** — all existing behaviour is unchanged.
+
+---
+
+## Overview
+
+Users are defined in the server config file. Each host can have an **owner**, zero or more **managers**, and zero or more **monitors**. A **default owner** catches any host that does not name an explicit owner.
+
+### Roles
+
+| Role | Inherits | Permissions |
+|------|----------|-------------|
+| **monitor** | — | View host status, plugin data, alerts; acknowledge alerts they were notified for |
+| **manager** | monitor | + Queue commands (`/c`), trigger DNS re-registration (`/n`), queue upgrades (`/u`); add/remove monitors |
+| **owner** | manager | + Drop host (`/d`); add/remove managers; transfer ownership; update host access |
+| **admin** *(flag)* | owner on all hosts | Full access to every host and the user list |
+
+`admin` is a flag on the user, not a per-host role. An admin user has owner-level access on every host without being listed as owner/manager/monitor.
+
+---
+
+## Configuration
+
+### Defining users
+
+```yaml
+users:
+  andreas:
+    full_name: Andreas Wrede
+    avatar: /path/to/avatar.png   # file path, URL, or base64 data URI (optional)
+    password: pbkdf2:sha256:...   # generated with: hbd passwd andreas
+    admin: true                   # optional — grants server-wide owner access
+
+  bob:
+    full_name: Bob Smith
+    password: pbkdf2:sha256:...
+    notification_channels: [pushover_standard]
+
+  carol:
+    full_name: Carol Jones
+    password: pbkdf2:sha256:...
+
+default_owner: andreas            # owns hosts with no explicit owner
+                                  # falls back to the first admin user if omitted
+```
+
+### Assigning roles to hosts
+
+```yaml
+hosts:
+  webserver01:
+    owner: andreas
+    managers: [bob]
+    monitors: [carol]
+    threshold_config: default
+    watch: true
+    notification_channels: [pushover_standard]
+
+  unattended-host:              # no owner → owned by default_owner
+    threshold_config: default
+    watch: true
+```
+
+### Generating a password hash
+
+```bash
+hbd passwd andreas
+```
+
+Enter and confirm the password when prompted. Paste the printed hash into the config file under the user's `password` key.
+
+You can also generate a hash non-interactively from Python:
+
+```python
+from hbd.server.users import hash_password
+print(hash_password("mysecret"))
+```
+
+Passwords are stored as PBKDF2-HMAC-SHA256 hashes (260 000 iterations). No third-party libraries are required — only Python's standard `hashlib`.
+
+---
+
+## Authentication
+
+When at least one user is defined, every request must be authenticated. Unauthenticated requests to HTML pages are redirected to `/login`; unauthenticated API requests receive `401 Unauthorized`.
+
+### Browser login
+
+Navigate to any page — you will be redirected to `/login` automatically. After submitting valid credentials the server sets an `hbd_session` cookie (HttpOnly, SameSite=Lax, 24 h lifetime). All subsequent requests, including JavaScript `fetch()` calls on the dashboards, carry the cookie automatically.
+
+To log out, visit `/logout`.
+
+### API / programmatic login
+
+```bash
+# Log in and capture the token
+TOKEN=$(curl -s -X POST http://localhost:50004/api/0/auth/login \
+  -H 'Content-Type: application/json' \
+  -d '{"username":"andreas","password":"mysecret"}' | jq -r .token)
+
+# Use the token in subsequent requests
+curl -H "Authorization: Bearer $TOKEN" http://localhost:50004/api/0/hosts
+```
+
+The token is identical to the session cookie value — both mechanisms work simultaneously.
+
+```bash
+# Log out
+curl -s -X POST http://localhost:50004/api/0/auth/logout \
+  -H "Authorization: Bearer $TOKEN"
+```
+
+---
+
+## API Endpoints
+
+### Authentication
+
+#### POST /api/0/auth/login
+Obtain a session token.
+
+**Request body:**
+```json
+{ "username": "andreas", "password": "mysecret" }
+```
+
+**Response:**
+```json
+{ "token": "<opaque-hex-token>", "username": "andreas" }
+```
+Also sets the `hbd_session` cookie for browser clients.
+
+**Status codes:** `200 OK`, `401 Unauthorized`, `404` (auth not configured)
+
+---
+
+#### POST /api/0/auth/logout
+Invalidate the current session.
+
+**Headers:** `Authorization: Bearer <token>` or cookie
+
+**Response:** `{ "success": true }`
+
+---
+
+### Users
+
+#### GET /api/0/users
+List all users. **Admin only.**
+
+**Response:**
+```json
+[
+  { "username": "andreas", "full_name": "Andreas Wrede", "avatar": "", "admin": true, "notification_channels": [] },
+  { "username": "bob",     "full_name": "Bob Smith",     "avatar": "", "admin": false, "notification_channels": ["pushover_standard"] }
+]
+```
+
+---
+
+#### GET /api/0/users/me
+Return the currently authenticated user's profile.
+
+**Response:**
+```json
+{ "username": "carol", "full_name": "Carol Jones", "avatar": "", "admin": false, "notification_channels": [] }
+```
+
+---
+
+### Host Access
+
+#### GET /api/0/hosts/{hostname}/access
+Return owner/managers/monitors for a host. Requires at least **monitor** role.
+
+**Response:**
+```json
+{
+  "owner": "andreas",
+  "managers": ["bob"],
+  "monitors": ["carol"]
+}
+```
+
+---
+
+#### PUT /api/0/hosts/{hostname}/access
+Update owner/managers/monitors. Requires **owner** role or admin.
+
+**Request body** (all fields optional):
+```json
+{
+  "owner": "bob",
+  "managers": ["carol"],
+  "monitors": []
+}
+```
+
+Changes take effect immediately in memory. They are not written back to the config file — reload (`SIGHUP`) will re-apply config values. To make changes permanent, update the config file.
+
+---
+
+## Host visibility
+
+When users are configured, `GET /api/0/hosts` only returns hosts the authenticated user has at least monitor access to. Admins see all hosts.
+
+---
+
+## Config reload
+
+On `SIGHUP`, the server reloads the config file, re-loads the user registry, and re-applies `owner`/`managers`/`monitors` from config to all known hosts. Existing sessions remain valid after a reload.
+
+---
+
+## No-auth mode
+
+If `users:` is absent or empty, the server starts in **unauthenticated mode**:
+
+- No login required — all pages and API endpoints are accessible without credentials.
+- All permission checks pass unconditionally.
+- `/login`, `/logout`, and the auth/user API endpoints return `404`.
+
+This preserves full backwards compatibility with existing deployments.
+
+---
+
+## Security notes
+
+- Session tokens are 64-character cryptographically random hex strings (`secrets.token_hex(32)`).
+- Sessions expire after 24 hours (configurable via `users_mod.SESSION_TTL`).
+- Cookies are `HttpOnly` and `SameSite=Lax` — they are not accessible to JavaScript and are not sent on cross-site requests.
+- The HTTP API does not yet enforce TLS. For production use, place hbd behind a TLS-terminating reverse proxy (nginx, Caddy, etc.) or enable WSS.
+
+---
+
+## See Also
+
+- [HTTP API Documentation](HTTP_API.md)
+- [Notifications](NOTIFICATIONS.md)
+- Configuration example: `hbd/config_example.yaml`

hbd/__init__.py

@@ -14,4 +14,4 @@ Install options:
 """
 
 __all__ = ["__version__"]
-__version__ = "5.0.10"
+__version__ = "5.1.0"

hbd/client/config.py

@@ -2,6 +2,9 @@
 
 import logging
 import os
+import logging
+
+logger = logging.getLogger(__name__)
 
 try:
     import yaml
@@ -30,18 +33,19 @@ def load_config(path=None):
     If YAML is not available or the file does not exist, defaults are returned.
     
     Args:
-        path: Path to YAML config file (default: ~/.hb.yaml)
+        path: Path to YAML config file (default: ~/.hbc.yaml)
         
     Returns:
         Dictionary with configuration
     """
     cfg = CLIENT_DEFAULTS.copy()
     if not path:
-        # default path (~/.hb.yaml)
-        path = os.path.join(os.path.expanduser("~"), ".hb.yaml")
+        # default path (~/.hbc.yaml)
+        path = os.path.join(os.path.expanduser("~"), ".hbc.yaml")
 
     if os.path.exists(path):
         if yaml:
+            logger.info("Loading configuration from %s", path)
             with open(path) as fh:
                 data = yaml.safe_load(fh)
             # Merge YAML data with defaults
@@ -50,5 +54,5 @@ def load_config(path=None):
                 cfg[k] = v
         else:
             # yaml not installed: do not attempt to parse; user must ensure defaults
-            pass
+            logger.warning("PyYAML not available - cannot load config from %s, using defaults", path)
     return cfg

hbd/client/main.py

@@ -644,13 +644,10 @@ def main(argv=None):
     parser = build_parser()
     args = parser.parse_args(argv)
     
-    # Load config
-    config = load_config(args.configfile)
-    
     # Setup logging
-    log_level = logging.INFO
+    log_level = logging.WARNING
     if args.verbose:
-        log_level = logging.DEBUG
+        log_level = logging.INFO
     if args.debug:
         log_level = logging.DEBUG
     
@@ -659,6 +656,9 @@ def main(argv=None):
         format="%(asctime)s %(name)s %(levelname)s: %(message)s",
         datefmt="%Y-%m-%d %H:%M:%S"
     )
+
+    # Load config
+    config = load_config(args.configfile)
     
     # Daemonize if requested
     if args.daemon:

hbd/client/plugin.py

@@ -311,7 +311,10 @@ class PluginLoader:
             return 0
         
         loaded_count = 0
-        plugin_config = config or {}
+        raw_config = config or {}
+        # Per-plugin config lives under the 'plugins' key; fall back to top-level
+        # for backwards compatibility.
+        plugin_config = raw_config.get("plugins", raw_config)
         
         # Scan for Python files
         for plugin_file in directory.glob("*.py"):

hbd/client/plugins/nagios_runner.py

@@ -81,7 +81,7 @@ class NagiosRunnerPlugin(MonitorPlugin):
         
         # Validate commands
         if not self.commands:
-            self.logger.warning(
+            self.logger.info(
                 "No Nagios commands configured. Add 'nagios_runner.commands' to config."
             )
     
@@ -94,7 +94,7 @@ class NagiosRunnerPlugin(MonitorPlugin):
         self.logger.info(f"Initializing {self.name} plugin")
         
         if not self.commands:
-            self.logger.error("No Nagios commands configured")
+            self.logger.info("No Nagios commands configured")
             return False
         
         self.logger.info(f"Configured to run {len(self.commands)} Nagios plugin(s)")

hbd/client/plugins/ping_monitor.py

@@ -0,0 +1,151 @@
+"""Ping Monitor Plugin for Heartbeat.
+
+Pings one or more hosts and reports round-trip time.  Results are sent as
+plugin metrics so the server-side threshold system can raise WARNING/CRITICAL
+alerts using the same RTT threshold configuration format used for heartbeat RTT.
+
+Example configuration in ~/.hbc.yaml (or the plugins section of ~/.hb.yaml):
+
+```yaml
+plugins:
+  ping_monitor:
+    interval: 60          # ping every 60 seconds (default)
+    count: 3              # ICMP packets per ping run (default 3)
+    timeout: 5            # seconds before a host is considered unreachable (default 5)
+    hosts:
+      8.8.8.8:
+        warning: 20.0     # ms
+        critical: 100.0   # ms
+      192.168.1.1:
+        warning: 5.0
+        critical: 20.0
+```
+
+Reported metrics per host (metric key uses the hostname with dots/colons replaced
+by underscores so it is a valid identifier):
+
+  ping.<hostname>.rtt_avg   – average RTT in ms  (float, or inf if unreachable)
+  ping.<hostname>.rtt_min   – minimum RTT in ms
+  ping.<hostname>.rtt_max   – maximum RTT in ms
+  ping.<hostname>.loss      – packet loss percentage (0–100)
+
+Server-side threshold config example:
+
+```yaml
+threshold_configs:
+  default:
+    thresholds:
+      ping_monitor:
+        8_8_8_8_rtt_avg:
+          warning: 20.0
+          critical: 100.0
+```
+"""
+
+import asyncio
+import re
+import sys
+from typing import Any, Dict, Optional
+
+from hbd.client.plugin import MonitorPlugin
+
+
+def _host_key(host: str) -> str:
+    """Convert a hostname/IP to a safe metric key (replace . and : with _)."""
+    return re.sub(r"[^a-zA-Z0-9_]", "_", host)
+
+
+class PingMonitorPlugin(MonitorPlugin):
+    """Ping one or more configured hosts and report RTT metrics."""
+
+    name = "ping_monitor"
+    version = "1.0.0"
+    description = "ICMP ping latency monitoring"
+    interval = 60
+
+    def __init__(self, config: Optional[Dict[str, Any]] = None):
+        super().__init__(config)
+        cfg = config or {}
+        self.interval = cfg.get("interval", 60)
+        self.count = int(cfg.get("count", 3))
+        self.timeout = int(cfg.get("timeout", 5))
+        # hosts: dict of {hostname: {warning: x, critical: y}} or list of hostnames
+        raw_hosts = cfg.get("hosts", {})
+        if isinstance(raw_hosts, list):
+            self.hosts = {h: {} for h in raw_hosts}
+        else:
+            self.hosts = dict(raw_hosts)
+
+    async def initialize(self) -> bool:
+        if not self.hosts:
+            self.logger.warning("ping_monitor: no hosts configured, plugin disabled")
+            return False
+        self.logger.info(
+            "ping_monitor initialized: %d host(s), interval=%ds, count=%d, timeout=%ds",
+            len(self.hosts), self.interval, self.count, self.timeout,
+        )
+        return True
+
+    async def _ping(self, host: str) -> Dict[str, float]:
+        """Run a system ping command and return rtt_min/avg/max/loss."""
+        if sys.platform == "win32":
+            cmd = ["ping", "-n", str(self.count), "-w", str(self.timeout * 1000), host]
+        else:
+            cmd = ["ping", "-c", str(self.count), "-W", str(self.timeout), host]
+
+        try:
+            proc = await asyncio.create_subprocess_exec(
+                *cmd,
+                stdout=asyncio.subprocess.PIPE,
+                stderr=asyncio.subprocess.PIPE,
+            )
+            stdout, _ = await asyncio.wait_for(
+                proc.communicate(),
+                timeout=self.timeout * self.count + 2,
+            )
+            output = stdout.decode(errors="replace")
+        except (asyncio.TimeoutError, FileNotFoundError, OSError) as e:
+            self.logger.warning("ping_monitor: ping failed for %s: %s", host, e)
+            return {"rtt_min": float("inf"), "rtt_avg": float("inf"),
+                    "rtt_max": float("inf"), "loss": 100.0}
+
+        # Parse packet loss
+        loss = 100.0
+        loss_match = re.search(r"(\d+(?:\.\d+)?)\s*%\s*packet\s*loss", output)
+        if loss_match:
+            loss = float(loss_match.group(1))
+
+        # Parse rtt min/avg/max — Linux: "rtt min/avg/max/mdev = x/x/x/x ms"
+        #                          macOS: "round-trip min/avg/max/stddev = x/x/x/x ms"
+        rtt_match = re.search(
+            r"(?:rtt|round-trip)\s+min/avg/max/\S+\s*=\s*([\d.]+)/([\d.]+)/([\d.]+)",
+            output,
+        )
+        if rtt_match:
+            return {
+                "rtt_min": float(rtt_match.group(1)),
+                "rtt_avg": float(rtt_match.group(2)),
+                "rtt_max": float(rtt_match.group(3)),
+                "loss": loss,
+            }
+
+        # Host unreachable or all packets lost
+        return {"rtt_min": float("inf"), "rtt_avg": float("inf"),
+                "rtt_max": float("inf"), "loss": loss}
+
+    async def _collect_metrics(self) -> Dict[str, Any]:
+        data: Dict[str, Any] = {}
+        tasks = {host: asyncio.create_task(self._ping(host)) for host in self.hosts}
+        for host, task in tasks.items():
+            try:
+                result = await task
+            except Exception as e:
+                self.logger.error("ping_monitor: error pinging %s: %s", host, e)
+                result = {"rtt_min": float("inf"), "rtt_avg": float("inf"),
+                          "rtt_max": float("inf"), "loss": 100.0}
+            key = _host_key(host)
+            for metric, value in result.items():
+                data[f"{key}_{metric}"] = value
+            status = "unreachable" if result["loss"] == 100.0 else f"{result['rtt_avg']:.1f}ms"
+            self.logger.debug("ping_monitor: %s -> %s", host, status)
+        return data

hbd/server/cli.py

@@ -1,6 +1,8 @@
 """Command line interface for hbd package."""
 
 import argparse
+import getpass
+import sys
 
 from .config import load_config
 from .main import run as run_server
@@ -14,26 +16,74 @@ def build_parser():
         description="HeartBeatDaemon - Wait for heartbeat messages and act on them (or their absence)",
         formatter_class=argparse.RawDescriptionHelpFormatter,
     )
-    parser.add_argument(
-        "-c", "--config", dest="configfile", help="Config file path (YAML)"
-    )
-    parser.add_argument(
-        "-f", "--foreground", action="store_true", help="Run in foreground"
-    )
+
+    subparsers = parser.add_subparsers(dest="command")
+
+    # --- serve (default) ---
+    serve_p = subparsers.add_parser("serve", help="Start the hbd server (default)")
+    serve_p.add_argument("-c", "--config", dest="configfile", help="Config file path (YAML)")
+    serve_p.add_argument("-f", "--foreground", action="store_true", help="Run in foreground")
+    serve_p.add_argument("-v", "--verbose", action="store_true", help="Verbose output")
+    serve_p.add_argument("-p", "--pushsrv", dest="pushsrv", choices=PUSHSRVS,
+                         help="Push service to use")
+    serve_p.add_argument("-x", "--debug", action="count", default=0, help="Increase debug level")
+
+    # Legacy top-level flags (no subcommand) — kept for backward compatibility
+    parser.add_argument("-c", "--config", dest="configfile", help="Config file path (YAML)")
+    parser.add_argument("-f", "--foreground", action="store_true", help="Run in foreground")
     parser.add_argument("-v", "--verbose", action="store_true", help="Verbose output")
-    parser.add_argument(
-        "-p", "--pushsrv", dest="pushsrv", choices=PUSHSRVS, help="Push service to use"
+    parser.add_argument("-p", "--pushsrv", dest="pushsrv", choices=PUSHSRVS,
+                        help="Push service to use")
+    parser.add_argument("-x", "--debug", action="count", default=0, help="Increase debug level")
+
+    # --- passwd ---
+    passwd_p = subparsers.add_parser(
+        "passwd",
+        help="Generate a password hash for use in the config file",
     )
-    parser.add_argument(
-        "-x", "--debug", action="count", default=0, help="Increase debug level"
+    passwd_p.add_argument(
+        "username",
+        nargs="?",
+        help="Username (informational only, for display)",
     )
+
     return parser
 
 
+def cmd_passwd(args):
+    """Interactive password hash generator."""
+    from .users import hash_password
+
+    username = args.username or ""
+    prompt = f"New password for {username}: " if username else "New password: "
+    while True:
+        pw = getpass.getpass(prompt)
+        if not pw:
+            print("Password must not be empty.", file=sys.stderr)
+            continue
+        pw2 = getpass.getpass("Confirm password: ")
+        if pw != pw2:
+            print("Passwords do not match, try again.", file=sys.stderr)
+            continue
+        break
+
+    hashed = hash_password(pw)
+    if username:
+        print(f"\nAdd the following to your config under users: -> {username}:")
+    else:
+        print("\nPassword hash (paste into config file under the user's 'password' key):")
+    print(f"  password: {hashed}")
+
+
 def main(argv=None):
     parser = build_parser()
     args = parser.parse_args(argv)
 
+    if args.command == "passwd":
+        cmd_passwd(args)
+        return
+
+    # Default: run the server (supports both `hbd serve ...` and `hbd ...`)
     config = load_config(args.configfile)
 
     # Apply CLI overrides

hbd/server/config.py

@@ -14,23 +14,25 @@ SERVER_DEFAULTS = {
     "hb_port": 50003,           # Port to listen for heartbeats
     "hbd_port": 50004,          # HTTP API port
     "hbd_host": "",             # Bind address (empty = all interfaces)
-    
+
     # Persistence
-    "pickfile": "/tmp/hb.pick",
-    
+    "pickfile": os.path.join(os.path.expanduser("~"), ".hb.pick"),  # File to store host state between restarts
+
     # Logging
-    "logfile": "/var/log/heartbeat.log",
-    "logfmt": "text",           # text or msg or json
-    
+    "logfile": os.path.join(os.path.expanduser("~"), ".hb.log"),
     # Notification channels
     "notification_channels": {},  # Named channels with type and credentials
     "default_notification_channels": [],  # Default channels if host doesn't specify
-    
+
     # Monitoring settings
     "interval": 20,             # Expected heartbeat interval (for server checks)
     "grace": 2,                 # Grace multiplier (interval * grace = timeout)
     "threshold_renotify_interval": 3600,  # Seconds between threshold re-notifications
-    
+
+    # User management
+    "users": {},                # username -> {full_name, avatar, password, admin, notification_channels}
+    "default_owner": None,      # Username that owns hosts with no explicit owner
+
     # Host management
     "hosts": {},                # New unified host definitions (optional)
     "watchhosts": [],           # Hosts to monitor and notify about (legacy)
@@ -65,6 +67,38 @@ SERVER_DEFAULTS = {
     "thresholds": {},
 }
 
+THRESHOLD_DEFAULTS = {
+    'thresholds': {
+        'cpu_monitor': {
+            'cpu_percent': {
+                'warning': 80.0, 
+                'critical': 90.0
+                }
+            },
+            'memory_monitor': {
+                'percent': {
+                    'warning': 85.0,
+                    'critical': 95.0
+                }
+            },
+            'disk_monitor': {
+                'partitions': {
+                    '/': {
+                        'percent': {
+                            'warning': 85.0,
+                            'critical': 90.0
+                        }
+                    }
+                }
+            },
+            'rtt': {
+                'warning': 200,
+                'critical': 250.0,
+                'count': 3  # Optional: number of consecutive breaches before alerting
+            }
+        }
+    }
+
 
 def load_config(path=None):
     """Load configuration from a YAML file and merge with server defaults.
@@ -321,20 +355,69 @@ def get_channel_config(config, channel_name):
 
 def get_notification_channels_config(config, hostname):
     """Get list of notification channel configurations for a host.
-    
+
     Args:
         config: Configuration dictionary
         hostname: Host name
-        
+
     Returns:
         List of (channel_name, channel_config) tuples
     """
     channel_names = get_notification_channels_for_host(config, hostname)
-    
+
     channels = []
     for channel_name in channel_names:
         channel_config = get_channel_config(config, channel_name)
         if channel_config and channel_config.get("type"):
             channels.append((channel_name, channel_config))
-    
+
     return channels
+
+
+# ---------------------------------------------------------------------------
+# User / host-access helpers
+# ---------------------------------------------------------------------------
+
+def get_default_owner(config) -> str | None:
+    """Return the configured default_owner username, or the first admin user, or None."""
+    explicit = config.get("default_owner")
+    if explicit:
+        return explicit
+    # Fall back to first admin user found in config
+    users_cfg = config.get("users", {})
+    if isinstance(users_cfg, dict):
+        for username, attrs in users_cfg.items():
+            if isinstance(attrs, dict) and attrs.get("admin", False):
+                return username
+    return None
+
+
+def get_host_access(config, hostname) -> dict:
+    """Return the access dict for *hostname*: owner, managers, monitors.
+
+    Falls back to default_owner for hosts without an explicit owner.
+
+    Returns:
+        {
+            "owner": str | None,
+            "managers": list[str],
+            "monitors": list[str],
+        }
+    """
+    host_cfg = get_host_config(config, hostname)
+
+    owner = host_cfg.get("owner") or get_default_owner(config)
+
+    managers = host_cfg.get("managers", [])
+    if isinstance(managers, str):
+        managers = [managers]
+
+    monitors = host_cfg.get("monitors", [])
+    if isinstance(monitors, str):
+        monitors = [monitors]
+
+    return {
+        "owner": owner,
+        "managers": list(managers),
+        "monitors": list(monitors),
+    }

hbd/server/hbdclass.py

@@ -297,6 +297,10 @@ class Host:
         self.plugin_retention = 100  # Keep last N samples per plugin
         # Alert state tracking: {metric_path: AlertState}
         self.alert_states = {}
+        # User access control
+        self.owner: str | None = None       # username of owner
+        self.managers: list = []            # usernames with manager role
+        self.monitors: list = []            # usernames with monitor role
 
     def statedict(self):
         d = {}
@@ -412,7 +416,12 @@ class Host:
         ddict["alert_warning_acked"] = warning_acked
         ddict["alert_critical_unacked"] = critical_unacked
         ddict["alert_critical_acked"] = critical_acked
-        
+
+        # User access
+        ddict["owner"] = getattr(self, "owner", None)
+        ddict["managers"] = list(getattr(self, "managers", []))
+        ddict["monitors"] = list(getattr(self, "monitors", []))
+
         return ddict
 
     def jsons(self):
@@ -458,6 +467,13 @@ class Host:
             self.plugin_retention = 100
         if not hasattr(self, "alert_states"):
             self.alert_states = {}
+        # User access fields (added in user-management feature)
+        if not hasattr(self, "owner"):
+            self.owner = None
+        if not hasattr(self, "managers"):
+            self.managers = []
+        if not hasattr(self, "monitors"):
+            self.monitors = []
 
         pass
 
@@ -511,12 +527,38 @@ class Host:
     
     def get_all_plugin_data(self):
         """Get all plugin data for this host.
-        
+
         Returns:
             Dict of {plugin_name: [(timestamp, data), ...]}
         """
         return self.plugin_data
 
+    # ------------------------------------------------------------------
+    # User-role helpers
+    # ------------------------------------------------------------------
+
+    def apply_access(self, owner, managers, monitors):
+        """Set owner/managers/monitors on this host (called from config load)."""
+        self.owner = owner
+        self.managers = list(managers)
+        self.monitors = list(monitors)
+
+    def is_owner(self, username: str) -> bool:
+        return self.owner == username
+
+    def is_manager(self, username: str) -> bool:
+        return username in self.managers or self.is_owner(username)
+
+    def is_monitor(self, username: str) -> bool:
+        return username in self.monitors or self.is_manager(username)
+
+    def access_dict(self) -> dict:
+        return {
+            "owner": self.owner,
+            "managers": list(self.managers),
+            "monitors": list(self.monitors),
+        }
+
     hostfields_long = [
         "name",
         "IPv4.addr",

hbd/server/http.py

@@ -10,6 +10,8 @@ from aiohttp import web
 import jinja2
 from . import data
 from . import notify as notify_mod
+from . import settings as settings_mod
+from . import users as users_mod
 
 logger = logging.getLogger(__name__)
 
@@ -20,6 +22,78 @@ def _render_template(html_str: str, **context) -> str:
     return tmpl.render(**context)
 
 
+# ---------------------------------------------------------------------------
+# Auth helpers
+# ---------------------------------------------------------------------------
+
+SESSION_COOKIE = "hbd_session"
+
+
+def _get_token(request) -> str:
+    """Extract session token from Bearer header, X-Auth-Token header, or cookie."""
+    auth = request.headers.get("Authorization", "")
+    if auth.lower().startswith("bearer "):
+        return auth[7:].strip()
+    header_token = request.headers.get("X-Auth-Token", "").strip()
+    if header_token:
+        return header_token
+    return request.cookies.get(SESSION_COOKIE, "")
+
+
+def _current_user(request):
+    """Return the authenticated User, or None when auth is not enabled."""
+    if not users_mod.users_enabled():
+        return None  # unauthenticated mode — all access allowed
+    return users_mod.get_session_user(_get_token(request))
+
+
+def _require_auth(request):
+    """Return (user, None) or (None, error Response)."""
+    if not users_mod.users_enabled():
+        return None, None
+    user = users_mod.get_session_user(_get_token(request))
+    if user is None:
+        return None, web.json_response({"error": "Unauthorized"}, status=401)
+    return user, None
+
+
+def _require_auth_redirect(request):
+    """Like _require_auth but returns a redirect to /login for browser requests."""
+    if not users_mod.users_enabled():
+        return None, None
+    user = users_mod.get_session_user(_get_token(request))
+    if user is None:
+        raise web.HTTPFound("/login")
+    return user, None
+
+
+def _can_view_host(user, host) -> bool:
+    """Return True if *user* may see *host* (monitor or higher, or no auth)."""
+    if user is None:
+        return True
+    if user.admin:
+        return True
+    return host.is_monitor(user.username)
+
+
+def _can_operate_host(user, host) -> bool:
+    """Manager-level: queue commands, DNS, upgrade."""
+    if user is None:
+        return True
+    if user.admin:
+        return True
+    return host.is_manager(user.username)
+
+
+def _can_own_host(user, host) -> bool:
+    """Owner-level: drop host, transfer ownership."""
+    if user is None:
+        return True
+    if user.admin:
+        return True
+    return host.is_owner(user.username)
+
+
 async def start(
     host: str,
     port: int,
@@ -37,7 +111,8 @@ async def start(
     """
     get_now = get_now or (lambda: time.time())
 
-    async def index(request):
+    async def old_index(request):
+        _require_auth_redirect(request)
         res = []
         res.append('<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">')
         res.append("<html>")
@@ -62,7 +137,15 @@ async def start(
         return web.Response(text=body, content_type="text/html")
 
     async def api_hosts(request):
-        lst = [hbdclass.Host.hosts[h].jsons() for h in hbdclass.Host.hosts]
+        user, err = _require_auth(request)
+        if err:
+            return err
+        hosts = [
+            hbdclass.Host.hosts[h]
+            for h in hbdclass.Host.hosts
+            if _can_view_host(user, hbdclass.Host.hosts[h])
+        ]
+        lst = [h.jsons() for h in hosts]
         return web.json_response(json.loads("[" + ",".join(lst) + "]"))
 
     async def api_messages(request):
@@ -70,6 +153,9 @@ async def start(
         return web.json_response(lst)
 
     async def cmd(request):
+        user, err = _require_auth(request)
+        if err:
+            return err
         qa = request.rel_url.query
         uname = qa.get("h")
         ucmd = qa.get("c")
@@ -77,34 +163,50 @@ async def start(
             return web.Response(status=400, text="need h= and c= arguments")
         if uname not in hbdclass.Host.hosts:
             return web.Response(status=400, text=f"h={uname} not found")
-        hbdclass.Host.hosts[uname].cmds.append(
-            ("CMD", {"cmd": urllib.parse.unquote(ucmd)})
-        )
+        host = hbdclass.Host.hosts[uname]
+        if not _can_operate_host(user, host):
+            return web.json_response({"error": "Forbidden"}, status=403)
+        host.cmds.append(("CMD", {"cmd": urllib.parse.unquote(ucmd)}))
         return web.Response(text=f"cmd {uname} queued")
 
     async def drop(request):
+        user, err = _require_auth(request)
+        if err:
+            return err
         qa = request.rel_url.query
         uname = qa.get("h")
         if not uname:
             return web.Response(status=400, text="need h= argument")
         if uname not in hbdclass.Host.hosts:
             return web.Response(status=400, text=f"h={uname} not found")
+        host = hbdclass.Host.hosts[uname]
+        if not _can_own_host(user, host):
+            return web.json_response({"error": "Forbidden"}, status=403)
         eventlog(uname, "INFO", "dropped")
         del hbdclass.Host.hosts[uname]
         return web.Response(text="Done")
 
     async def register(request):
+        user, err = _require_auth(request)
+        if err:
+            return err
         qa = request.rel_url.query
         uname = qa.get("h")
         if not uname:
             return web.Response(status=400, text="need h= argument")
         if uname not in hbdclass.Host.hosts:
             return web.Response(status=400, text=f"h={uname} not found")
-        ll = hbdclass.Host.hosts[uname].registerDns()
+        host = hbdclass.Host.hosts[uname]
+        if not _can_operate_host(user, host):
+            return web.json_response({"error": "Forbidden"}, status=403)
+        ll = host.registerDns()
         eventlog(uname, "INFO", ll)
         return web.Response(text=str(ll))
 
     async def update(request):
+        user, err = _require_auth(request)
+        if err:
+            return err
         qa = request.rel_url.query
         uname = urllib.parse.unquote(qa.get("h", ""))
         ucode = qa.get("c")
@@ -118,16 +220,21 @@ async def start(
             names = [n for n in hbdclass.Host.hosts]
         out = []
         for n in names:
-            err = None
+            host = hbdclass.Host.hosts[n]
+            if not _can_operate_host(user, host):
+                out.append(f"update skipped for {n}: Forbidden")
+                continue
+            op_err = None
             try:
                 r = {"csum": None, "code": ucode}
-                hbdclass.Host.hosts[n].cmds.append(("UPD", r))
+                host.cmds.append(("UPD", r))
             except Exception as e:
-                err = str(e)
-            out.append(f"update started for {n}: {err if err else 'OK'}")
+                op_err = str(e)
+            out.append(f"update started for {n}: {op_err if op_err else 'OK'}")
         return web.Response(text="\n".join(out))
 
     async def live(request):
+        current_user, _ = _require_auth_redirect(request)
         # render template from hbd/templates/live.html using Jinja2
         # Resolve templates directory relative to the hbd package
         pkg_dir = os.path.dirname(__file__)
@@ -151,6 +258,8 @@ async def start(
                 hbdclass.Host.hosts[h].stateinfo() for h in sorted(hbdclass.Host.hosts)
             ],
             messages=data.msgs[-30:],
+            current_user=current_user.to_dict() if current_user else None,
+            active_page="live",
         )
         return web.Response(text=body, content_type="text/html")
 
@@ -185,16 +294,18 @@ async def start(
 
     async def api_host_plugins(request):
         """Get all plugin data for a specific host."""
+        user, err = _require_auth(request)
+        if err:
+            return err
         hostname = request.match_info.get("hostname")
         
         if hostname not in hbdclass.Host.hosts:
-            return web.json_response(
-                {"error": f"Host '{hostname}' not found"},
-                status=404
-            )
-        
+            return web.json_response({"error": f"Host '{hostname}' not found"}, status=404)
+
         host = hbdclass.Host.hosts[hostname]
-        
+        if not _can_view_host(user, host):
+            return web.json_response({"error": "Forbidden"}, status=403)
+
         # Get plugin data with most recent sample for each plugin
         plugins_summary = {}
         for plugin_name, samples in host.plugin_data.items():
@@ -214,16 +325,18 @@ async def start(
 
     async def api_host_plugin_detail(request):
         """Get detailed data for a specific plugin on a host."""
+        user, err = _require_auth(request)
+        if err:
+            return err
         hostname = request.match_info.get("hostname")
         plugin_name = request.match_info.get("plugin_name")
-        
+
         if hostname not in hbdclass.Host.hosts:
-            return web.json_response(
-                {"error": f"Host '{hostname}' not found"},
-                status=404
-            )
-        
+            return web.json_response({"error": f"Host '{hostname}' not found"}, status=404)
+
         host = hbdclass.Host.hosts[hostname]
+        if not _can_view_host(user, host):
+            return web.json_response({"error": "Forbidden"}, status=403)
         
         # Get limit from query parameter
         limit = request.rel_url.query.get("limit", "10")
@@ -259,15 +372,17 @@ async def start(
 
     async def api_host_alerts(request):
         """Get alert states for a specific host."""
+        user, err = _require_auth(request)
+        if err:
+            return err
         hostname = request.match_info.get("hostname")
-        
+
         if hostname not in hbdclass.Host.hosts:
-            return web.json_response(
-                {"error": f"Host '{hostname}' not found"},
-                status=404
-            )
-        
+            return web.json_response({"error": f"Host '{hostname}' not found"}, status=404)
+
         host = hbdclass.Host.hosts[hostname]
+        if not _can_view_host(user, host):
+            return web.json_response({"error": "Forbidden"}, status=403)
         
         # Get alert states
         alerts = []
@@ -287,9 +402,14 @@ async def start(
 
     async def api_all_alerts(request):
         """Get all active alerts across all hosts."""
+        user, err = _require_auth(request)
+        if err:
+            return err
         all_alerts = []
-        
+
         for hostname, host in hbdclass.Host.hosts.items():
+            if not _can_view_host(user, host):
+                continue
             if threshold_checker:
                 active_alerts = threshold_checker.get_active_alerts(host.alert_states)
             else:
@@ -326,6 +446,9 @@ async def start(
     
     async def api_acknowledge_alert(request):
         """Acknowledge an alert to stop reminder notifications."""
+        user, err = _require_auth(request)
+        if err:
+            return err
         try:
             data = await request.json()
         except Exception:
@@ -350,7 +473,9 @@ async def start(
             )
         
         host = hbdclass.Host.hosts[hostname]
-        
+        if not _can_view_host(user, host):
+            return web.json_response({"error": "Forbidden"}, status=403)
+
         if metric_path not in host.alert_states:
             return web.json_response(
                 {"error": f"Alert '{metric_path}' not found for host '{hostname}'"},
@@ -373,50 +498,338 @@ async def start(
 
     async def plugins_page(request):
         """Render the plugin metrics visualization page."""
+        current_user, _ = _require_auth_redirect(request)
         pkg_dir = os.path.dirname(__file__)
         templates_dir = config.get("templates_dir", os.path.join(pkg_dir, "templates"))
         env = jinja2.Environment(loader=jinja2.FileSystemLoader(templates_dir))
-        
-        # Collect all hosts with plugin data
+
+        # Collect all hosts with plugin data (filtered by visibility)
         hosts_with_plugins = []
         for hostname in sorted(hbdclass.Host.hosts.keys()):
             host = hbdclass.Host.hosts[hostname]
+            if not _can_view_host(current_user, host):
+                continue
             if host.plugin_data:
                 hosts_with_plugins.append({
                     "name": hostname,
                     "plugins": list(host.plugin_data.keys()),
                 })
-        
+
         tmpl = env.get_template("plugins.html")
         body = tmpl.render(
             title="Plugin Metrics - Heartbeat",
             header="Plugin Metrics",
             hosts=hosts_with_plugins,
+            current_user=current_user.to_dict() if current_user else None,
+            active_page="plugins",
         )
         return web.Response(text=body, content_type="text/html")
 
     async def alerts_page(request):
         """Render the alerts dashboard page."""
+        current_user, _ = _require_auth_redirect(request)
         pkg_dir = os.path.dirname(__file__)
         templates_dir = config.get("templates_dir", os.path.join(pkg_dir, "templates"))
         env = jinja2.Environment(loader=jinja2.FileSystemLoader(templates_dir))
-        
+
         tmpl = env.get_template("alerts.html")
         body = tmpl.render(
             title="Alerts Dashboard - Heartbeat",
             header="Alerts Dashboard",
+            current_user=current_user.to_dict() if current_user else None,
+            active_page="alerts",
+        )
+        return web.Response(text=body, content_type="text/html")
+
+    # -------------------------------------------------------------------------
+    # Auth endpoints
+    # -------------------------------------------------------------------------
+
+    async def api_login(request):
+        """POST /api/0/auth/login  {username, password} -> {token}
+        Also sets an hbd_session cookie for browser clients.
+        """
+        if not users_mod.users_enabled():
+            return web.json_response({"error": "Auth not configured"}, status=404)
+        try:
+            body = await request.json()
+        except Exception:
+            return web.json_response({"error": "Invalid JSON"}, status=400)
+        username = body.get("username", "")
+        password = body.get("password", "")
+        user = users_mod.authenticate(username, password)
+        if user is None:
+            return web.json_response({"error": "Invalid credentials"}, status=401)
+        token = users_mod.create_session(username)
+        resp = web.json_response({"token": token, "username": username})
+        resp.set_cookie(
+            SESSION_COOKIE,
+            token,
+            max_age=users_mod.SESSION_TTL,
+            httponly=True,
+            samesite="Lax",
+        )
+        return resp
+
+    async def login_page(request):
+        """GET /login — show login form; POST /login — process and redirect."""
+        if not users_mod.users_enabled():
+            raise web.HTTPFound("/")
+
+        error = ""
+        if request.method == "POST":
+            form = await request.post()
+            username = form.get("username", "")
+            password = form.get("password", "")
+            user = users_mod.authenticate(username, password)
+            if user:
+                token = users_mod.create_session(username)
+                redirect_to = request.rel_url.query.get("next", "/")
+                resp = web.HTTPFound(redirect_to)
+                resp.set_cookie(
+                    SESSION_COOKIE,
+                    token,
+                    max_age=users_mod.SESSION_TTL,
+                    httponly=True,
+                    samesite="Lax",
+                )
+                raise resp
+            error = "Invalid username or password."
+
+        html = f"""<!DOCTYPE html>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>Heartbeat — Login</title>
+  <style>
+    body {{ font-family: sans-serif; background: #f5f5f5; display: flex;
+            justify-content: center; align-items: center; height: 100vh; margin: 0; }}
+    .box {{ background: #fff; padding: 2em 2.5em; border-radius: 8px;
+             box-shadow: 0 2px 12px rgba(0,0,0,.15); min-width: 300px; }}
+    h2 {{ margin: 0 0 1.2em; color: #333; font-size: 1.4em; }}
+    label {{ display: block; margin-bottom: .3em; font-size: .9em; color: #555; }}
+    input {{ width: 100%; padding: .5em .7em; border: 1px solid #ccc;
+              border-radius: 4px; font-size: 1em; box-sizing: border-box; }}
+    button {{ margin-top: 1.2em; width: 100%; padding: .6em; background: #0066cc;
+               color: #fff; border: none; border-radius: 4px; font-size: 1em; cursor: pointer; }}
+    button:hover {{ background: #0055aa; }}
+    .error {{ color: #c00; font-size: .9em; margin-bottom: .8em; }}
+    .field {{ margin-bottom: .9em; }}
+  </style>
+</head>
+<body>
+  <div class="box">
+    <h2>Heartbeat</h2>
+    {'<p class="error">' + error + '</p>' if error else ''}
+    <form method="post">
+      <div class="field"><label>Username</label><input name="username" autofocus></div>
+      <div class="field"><label>Password</label><input name="password" type="password"></div>
+      <button type="submit">Sign in</button>
+    </form>
+  </div>
+</body>
+</html>"""
+        return web.Response(text=html, content_type="text/html")
+
+    async def web_logout(request):
+        """GET /logout — clear session cookie and redirect to /login."""
+        token = request.cookies.get(SESSION_COOKIE, "")
+        users_mod.delete_session(token)
+        resp = web.HTTPFound("/login")
+        resp.del_cookie(SESSION_COOKIE)
+        raise resp
+
+    async def api_logout(request):
+        """POST /api/0/auth/logout"""
+        token = _get_token(request)
+        users_mod.delete_session(token)
+        resp = web.json_response({"success": True})
+        resp.del_cookie(SESSION_COOKIE)
+        return resp
+
+    # -------------------------------------------------------------------------
+    # User endpoints
+    # -------------------------------------------------------------------------
+
+    async def api_user_avatar(request):
+        """GET /api/0/users/{username}/avatar — serve a local avatar file.
+
+        Only reachable when the user's avatar config value starts with '/'.
+        Falls back to 404 for external URLs (the browser fetches those directly).
+        """
+        user, err = _require_auth(request)
+        if err:
+            return err
+        username = request.match_info.get("username")
+        target_user = users_mod.get_user(username)
+        if target_user is None:
+            return web.Response(status=404, text="User not found")
+        if not target_user.avatar_is_local():
+            return web.Response(status=404, text="No local avatar configured")
+        path = target_user.avatar
+        if not os.path.isfile(path):
+            return web.Response(status=404, text="Avatar file not found")
+        # Infer content-type from extension
+        ext = os.path.splitext(path)[1].lower()
+        mime = {
+            ".png": "image/png",
+            ".jpg": "image/jpeg",
+            ".jpeg": "image/jpeg",
+            ".gif": "image/gif",
+            ".webp": "image/webp",
+            ".svg": "image/svg+xml",
+        }.get(ext, "application/octet-stream")
+        return web.FileResponse(path=path, headers={"Content-Type": mime})
+
+    async def api_users(request):
+        """GET /api/0/users — admin only."""
+        user, err = _require_auth(request)
+        if err:
+            return err
+        if users_mod.users_enabled() and (user is None or not user.admin):
+            return web.json_response({"error": "Forbidden"}, status=403)
+        return web.json_response([u.to_dict() for u in users_mod.users.values()])
+
+    async def api_user_self(request):
+        """GET /api/0/users/me — own profile."""
+        user, err = _require_auth(request)
+        if err:
+            return err
+        if user is None:
+            return web.json_response({"error": "Auth not configured"}, status=404)
+        return web.json_response(user.to_dict())
+
+    # -------------------------------------------------------------------------
+    # Host access endpoints
+    # -------------------------------------------------------------------------
+
+    async def api_host_access_get(request):
+        """GET /api/0/hosts/{hostname}/access"""
+        user, err = _require_auth(request)
+        if err:
+            return err
+        hostname = request.match_info.get("hostname")
+        if hostname not in hbdclass.Host.hosts:
+            return web.json_response({"error": f"Host '{hostname}' not found"}, status=404)
+        host = hbdclass.Host.hosts[hostname]
+        if not _can_view_host(user, host):
+            return web.json_response({"error": "Forbidden"}, status=403)
+        return web.json_response(host.access_dict())
+
+    async def api_host_access_put(request):
+        """PUT /api/0/hosts/{hostname}/access  — owner or admin only.
+
+        Body: {owner?: str, managers?: [str], monitors?: [str]}
+        """
+        user, err = _require_auth(request)
+        if err:
+            return err
+        hostname = request.match_info.get("hostname")
+        if hostname not in hbdclass.Host.hosts:
+            return web.json_response({"error": f"Host '{hostname}' not found"}, status=404)
+        host = hbdclass.Host.hosts[hostname]
+        if not _can_own_host(user, host):
+            return web.json_response({"error": "Forbidden"}, status=403)
+        try:
+            body = await request.json()
+        except Exception:
+            return web.json_response({"error": "Invalid JSON"}, status=400)
+
+        if "owner" in body:
+            host.owner = body["owner"] or None
+        if "managers" in body:
+            host.managers = list(body["managers"])
+        if "monitors" in body:
+            host.monitors = list(body["monitors"])
+
+        return web.json_response(host.access_dict())
+
+    # -------------------------------------------------------------------------
+    # User profile page
+    # -------------------------------------------------------------------------
+
+    async def profile_page(request):
+        """GET /profile — current user's settings and host access summary."""
+        current_user, _ = _require_auth_redirect(request)
+        pkg_dir = os.path.dirname(__file__)
+        templates_dir = config.get("templates_dir", os.path.join(pkg_dir, "templates"))
+        env = jinja2.Environment(loader=jinja2.FileSystemLoader(templates_dir))
+
+        # Build host access summary for this user
+        owned, managed, monitored = [], [], []
+        if current_user:
+            for hostname, host in sorted(hbdclass.Host.hosts.items()):
+                if host.is_owner(current_user.username):
+                    owned.append(hostname)
+                elif host.is_manager(current_user.username):
+                    managed.append(hostname)
+                elif host.is_monitor(current_user.username):
+                    monitored.append(hostname)
+
+        # Resolve notification channel configs for display
+        notif_channels = []
+        if current_user:
+            for ch_name in (current_user.notification_channels or []):
+                ch_cfg = config.get("notification_channels", {}).get(ch_name, {})
+                notif_channels.append({"name": ch_name, "type": ch_cfg.get("type", "")})
+
+        tmpl = env.get_template("profile.html")
+        body = tmpl.render(
+            title="Profile - Heartbeat",
+            header="My Profile",
+            current_user=current_user.to_dict() if current_user else None,
+            owned_hosts=owned,
+            managed_hosts=managed,
+            monitored_hosts=monitored,
+            notification_channels=notif_channels,
+            active_page="profile",
+        )
+        return web.Response(text=body, content_type="text/html")
+
+    # -------------------------------------------------------------------------
+    # Settings page (admin only)
+    # -------------------------------------------------------------------------
+
+    async def settings_page(request):
+        """GET /settings — read-only view of the current server configuration."""
+        current_user, _ = _require_auth_redirect(request)
+        if current_user and not current_user.admin:
+            raise web.HTTPForbidden(reason="Admin access required")
+        pkg_dir = os.path.dirname(__file__)
+        templates_dir = config.get("templates_dir", os.path.join(pkg_dir, "templates"))
+        env = jinja2.Environment(loader=jinja2.FileSystemLoader(templates_dir))
+        tmpl = env.get_template("settings.html")
+        body = tmpl.render(
+            title="Settings - Heartbeat",
+            sections=settings_mod.get_settings_sections(config),
+            current_user=current_user.to_dict() if current_user else None,
+            active_page="settings",
         )
         return web.Response(text=body, content_type="text/html")
 
     app = web.Application()
     app.add_routes(
         [
-            web.get("/", index),
+            web.get("/", live),
+            web.get("/old", old_index),
+            # Auth
+            web.get("/login", login_page),
+            web.post("/login", login_page),
+            web.get("/logout", web_logout),
+            web.post("/api/0/auth/login", api_login),
+            web.post("/api/0/auth/logout", api_logout),
+            # Users
+            web.get("/api/0/users", api_users),
+            web.get("/api/0/users/me", api_user_self),
+            web.get("/api/0/users/{username}/avatar", api_user_avatar),
+            # Hosts
             web.get("/api/0/hosts", api_hosts),
             web.get("/api/0/messages", api_messages),
             web.get("/api/0/hosts/{hostname}/plugins", api_host_plugins),
             web.get("/api/0/hosts/{hostname}/plugins/{plugin_name}", api_host_plugin_detail),
             web.get("/api/0/hosts/{hostname}/alerts", api_host_alerts),
+            web.get("/api/0/hosts/{hostname}/access", api_host_access_get),
+            web.put("/api/0/hosts/{hostname}/access", api_host_access_put),
             web.get("/api/0/alerts", api_all_alerts),
             web.post("/api/0/alerts/acknowledge", api_acknowledge_alert),
             web.get("/c", cmd),
@@ -426,6 +839,8 @@ async def start(
             web.get("/live", live),
             web.get("/plugins", plugins_page),
             web.get("/alerts", alerts_page),
+            web.get("/profile", profile_page),
+            web.get("/settings", settings_page),
             web.get("/static/{path:.*}", static),
             web.get("/favicon.ico", favicon),
         ]
@@ -436,8 +851,7 @@ async def start(
     site = web.TCPSite(runner, host, port)
     await site.start()
 
-    if verbose:
-        print(f"HTTP server started on {host}:{port}")
+    logger.info(f"HTTP server started on {host}:{port}")
 
     try:
         await asyncio.Future()

hbd/server/main.py

@@ -14,7 +14,8 @@ from . import hbdclass
 
 from . import ws as ws_mod
 from . import notify as notify_mod
-from . import data 
+from . import data
+from . import users as users_mod
 
 logger = logging.getLogger(__name__)
 msg_to_websockets = ws_mod.broadcast
@@ -26,6 +27,7 @@ def save_state(config, hbdclass):
     """Save current state to pickle file. Safe to call at any time."""
     import pickle
     import os
+    from . import users as users_mod
 
     # Clear timer references before pickling (they can't be serialized)
     for hostname, host in list(hbdclass.Host.hosts.items()):
@@ -47,6 +49,7 @@ def save_state(config, hbdclass):
             pick = pickle.Pickler(pickf)
             pick.dump(hbdclass.Host.hosts)
             pick.dump(data.msgs)
+            pick.dump(users_mod.save_sessions())
         os.replace(tmpfile, pickfile)
     except Exception as e:
         logger.error("Failed to save state: %s", e)
@@ -84,7 +87,20 @@ async def reload_configuration(config_obj, config_path, components):
         
         # Update notify module
         notify_mod.reload_config(new_config)
-        
+
+        # Reload users
+        users_mod.load_users(new_config)
+
+        # Re-apply host attributes from updated config to all known hosts
+        from . import config as config_mod
+        dyndnshosts = config_mod.get_dyndnshosts(new_config)
+        watchhosts = config_mod.get_watchhosts(new_config)
+        for hostname, host in hbdclass.Host.hosts.items():
+            host.dyn = hostname in dyndnshosts
+            host.watched = hostname in watchhosts
+            access = config_mod.get_host_access(new_config, hostname)
+            host.apply_access(access["owner"], access["managers"], access["monitors"])
+
         # Reload threshold checker
         if 'threshold_checker' in components:
             components['threshold_checker'].reload(new_config)
@@ -116,6 +132,10 @@ async def reload_configuration(config_obj, config_path, components):
 
 
 async def _run_async(config, config_path=None):
+    from .config import ReloadableConfig
+    if not isinstance(config, ReloadableConfig):
+        config = ReloadableConfig(config, config_path)
+
     loop = asyncio.get_running_loop()
     shutdown_event = asyncio.Event()
     reload_event = asyncio.Event()
@@ -177,14 +197,14 @@ async def _run_async(config, config_path=None):
     sock.bind(bind_addr)
     logger.info("Starting UDP server on %s:%s", *bind_addr)
 
-    # Try to enable kernel receive timestamps (Linux SO_TIMESTAMPNS).
+    # Try to enable kernel receive timestamps (Linux SO_TIMESTAMP).
     # If supported, read datagrams via recvmsg() so RTT uses the kernel
     # timestamp rather than the time.time() call after asyncio scheduling.
     use_kernel_ts = udp.enable_kernel_timestamps(sock)
     if use_kernel_ts:
-        logger.info("SO_TIMESTAMPNS enabled: using kernel receive timestamps for RTT")
+        logger.info("SO_TIMESTAMP enabled: using kernel receive timestamps for RTT")
     else:
-        logger.info("SO_TIMESTAMPNS not available: using time.time() for RTT")
+        logger.info("SO_TIMESTAMP not available: using time.time() for RTT")
 
     def udp_handler(msg, addr, transport, recv_ts=None):
         ctx = dict(
@@ -406,6 +426,13 @@ async def _run_async(config, config_path=None):
         except Exception as e:
             logger.warning("Error stopping DNS worker: %s", e)
 
+        # Save state (hosts + sessions) on clean shutdown
+        try:
+            save_state(config, hbdclass)
+            logger.info("State saved on shutdown")
+        except Exception as e:
+            logger.warning("Error saving state on shutdown: %s", e)
+
         logger.info("All tasks cancelled")
 
 
@@ -414,6 +441,7 @@ def load_pickled_hosts(config, hbdclass):
     import os
     import pickle
     from . import config as config_mod
+    from . import users as users_mod
 
     pickfile = config.get("pickfile", "hbd.pickle")
     dyndnshosts = config_mod.get_dyndnshosts(config)
@@ -427,6 +455,10 @@ def load_pickled_hosts(config, hbdclass):
         try:
             hbdclass.Host.hosts = pick.load()
             data.msgs = pick.load()
+            try:
+                users_mod.load_sessions(pick.load())
+            except Exception:
+                pass  # older pickle without sessions — fine
             pickf.close()
         except Exception as e:
             logger.exception("load pickled failed: %s", e)
@@ -436,6 +468,10 @@ def load_pickled_hosts(config, hbdclass):
             hbdclass.Host.hosts[h].dyn = h in dyndnshosts
             hbdclass.Host.hosts[h].watched = h in watchhosts
             hbdclass.Host.hosts[h].fixup()
+            access = config_mod.get_host_access(config, h)
+            hbdclass.Host.hosts[h].apply_access(
+                access["owner"], access["managers"], access["monitors"]
+            )
         for h in drophosts:
             if h in hbdclass.Host.hosts:
                 del hbdclass.Host.hosts[h]
@@ -457,12 +493,16 @@ def run(config, config_path=None):
     """
     import os
 
-    logging.basicConfig(
-        level=logging.DEBUG if config.get("debug", 0) > 0 else logging.INFO
-    )
+    log_level = logging.WARNING
+    if config.get("verbose", False):
+        log_level = logging.INFO
+    if config.get("debug", 0) > 0:
+        log_level = logging.DEBUG
+    logging.basicConfig(level=log_level)
     load_pickled_hosts(config, hbdclass)
 
     notify_mod.initlog(logfile=config.get("logfile", "messages.log"))
+    users_mod.load_users(config)
     eventlog(None, "INFO", f"hbd version {__version__} starting up")
     
     if config_path:

hbd/server/settings.py

@@ -0,0 +1,328 @@
+"""Settings descriptor: maps config keys to display metadata.
+
+``get_settings_sections(config)`` returns an ordered list of sections, each
+containing a list of field descriptors.  The template iterates this structure
+generically, so adding editability later is a matter of:
+
+  1. Setting ``"editable": True`` on a field.
+  2. Adding the matching ``<input>``/``<select>`` in the template
+     (guided by ``"type"``).
+  3. Wiring a POST handler in http.py.
+
+Field descriptor keys
+---------------------
+key         str   Config key (for future form POST matching)
+label       str   Human-readable label
+description str   One-line help text shown below the value
+value       any   Sanitized display value (secrets replaced with "•••")
+type        str   One of: text | number | port | boolean | path | duration |
+                  list | secret | size | select
+editable    bool  Reserved for future use — currently always False
+sensitive   bool  True when the raw value must never be shown
+"""
+
+# Credential field names that should always be masked.
+_SECRET_KEYS = frozenset({
+    "password", "token", "user_key", "api_key", "secret",
+    "smtp_password", "smtp_user",
+})
+
+_CHANNEL_TYPE_LABELS = {
+    "pushover":   "Pushover",
+    "email":      "E-mail",
+    "signal":     "Signal",
+    "mattermost": "Mattermost",
+}
+
+
+def _mask(value):
+    """Return a masked placeholder for sensitive values."""
+    if not value:
+        return ""
+    return "•••"
+
+
+def _fmt_size(n):
+    """Format a byte count as a human-readable string."""
+    try:
+        n = int(n)
+    except (TypeError, ValueError):
+        return str(n)
+    for unit in ("B", "KB", "MB", "GB"):
+        if n < 1024:
+            return f"{n} {unit}"
+        n //= 1024
+    return f"{n} TB"
+
+
+def _fmt_duration(seconds):
+    """Format seconds into a human-readable duration string."""
+    try:
+        s = int(seconds)
+    except (TypeError, ValueError):
+        return str(seconds)
+    if s < 60:
+        return f"{s}s"
+    if s < 3600:
+        m, sec = divmod(s, 60)
+        return f"{m}m {sec}s" if sec else f"{m}m"
+    h, rem = divmod(s, 3600)
+    m = rem // 60
+    return f"{h}h {m}m" if m else f"{h}h"
+
+
+def _sanitize_channel(name, cfg):
+    """Return a sanitized copy of a notification channel config."""
+    result = {}
+    for k, v in cfg.items():
+        if k in _SECRET_KEYS:
+            result[k] = _mask(v)
+        elif isinstance(v, list):
+            result[k] = v
+        else:
+            result[k] = v
+    return result
+
+
+# ---------------------------------------------------------------------------
+# Public API
+# ---------------------------------------------------------------------------
+
+def get_settings_sections(config: dict) -> list:
+    """Return ordered list of setting sections for the settings page.
+
+    Each section:
+        {
+            "title": str,
+            "description": str,
+            "fields": [ field_descriptor, ... ]
+        }
+
+    Each field_descriptor:
+        {
+            "key":         str,
+            "label":       str,
+            "description": str,
+            "value":       display_value,
+            "raw":         raw_config_value,   # None for sensitive
+            "type":        str,
+            "editable":    bool,
+            "sensitive":   bool,
+        }
+    """
+    def field(key, label, ftype, description="", editable=False, sensitive=False):
+        raw = config.get(key)
+        if sensitive:
+            display = _mask(raw)
+            raw_out = None
+        elif ftype == "size":
+            display = _fmt_size(raw)
+            raw_out = raw
+        elif ftype == "duration":
+            display = _fmt_duration(raw)
+            raw_out = raw
+        elif ftype == "boolean":
+            display = bool(raw)
+            raw_out = raw
+        elif ftype == "list":
+            val = raw or []
+            display = list(val) if not isinstance(val, list) else val
+            raw_out = display
+        else:
+            display = raw if raw is not None else ""
+            raw_out = raw
+        return {
+            "key": key,
+            "label": label,
+            "description": description,
+            "value": display,
+            "raw": raw_out,
+            "type": ftype,
+            "editable": editable,
+            "sensitive": sensitive,
+        }
+
+    # ---- Notification channels (complex, built separately) ----------------
+    notif_channels = []
+    for ch_name, ch_cfg in (config.get("notification_channels") or {}).items():
+        if not isinstance(ch_cfg, dict):
+            continue
+        ch_type = ch_cfg.get("type", "")
+        fields = []
+        for k, v in ch_cfg.items():
+            if k == "type":
+                continue
+            sensitive = k in _SECRET_KEYS
+            fields.append({
+                "key": k,
+                "label": k.replace("_", " ").title(),
+                "value": _mask(v) if sensitive else (
+                    ", ".join(v) if isinstance(v, list) else str(v)
+                ),
+                "sensitive": sensitive,
+            })
+        notif_channels.append({
+            "name": ch_name,
+            "type": ch_type,
+            "type_label": _CHANNEL_TYPE_LABELS.get(ch_type, ch_type.title()),
+            "fields": fields,
+        })
+
+    # ---- Users (show metadata only, never password hashes) ----------------
+    users_list = []
+    for username, attrs in (config.get("users") or {}).items():
+        if not isinstance(attrs, dict):
+            continue
+        users_list.append({
+            "username": username,
+            "full_name": attrs.get("full_name", ""),
+            "admin": bool(attrs.get("admin", False)),
+            "avatar": attrs.get("avatar", ""),
+            "notification_channels": attrs.get("notification_channels", []),
+        })
+
+    # ---- Hosts summary ----------------------------------------------------
+    hosts_list = []
+    for hname, hcfg in (config.get("hosts") or {}).items():
+        if not isinstance(hcfg, dict):
+            continue
+        hosts_list.append({
+            "name": hname,
+            "watch": bool(hcfg.get("watch", False)),
+            "dyndns": bool(hcfg.get("dyndns", False)),
+            "owner": hcfg.get("owner", ""),
+            "managers": hcfg.get("managers", []),
+            "monitors": hcfg.get("monitors", []),
+            "threshold_config": hcfg.get("threshold_config", ""),
+            "notification_channels": hcfg.get("notification_channels", []),
+        })
+
+    return [
+        {
+            "id": "network",
+            "title": "Network",
+            "description": "Ports and bind addresses for all server sockets.",
+            "fields": [
+                field("hb_port",  "Heartbeat UDP port",  "port",
+                      "UDP port the server listens on for heartbeat datagrams."),
+                field("hbd_host", "HTTP bind address",   "text",
+                      "Interface to bind the HTTP server to. Empty = all interfaces."),
+                field("hbd_port", "HTTP API port",       "port",
+                      "TCP port for the HTTP API and web UI."),
+                field("ws_port",  "WebSocket port",      "port",
+                      "TCP port for the plain WebSocket server."),
+                field("wss_port", "Secure WebSocket port", "port",
+                      "TCP port for WSS (TLS WebSocket). Leave empty to disable."),
+            ],
+        },
+        {
+            "id": "tls",
+            "title": "TLS / WebSocket Security",
+            "description": "Certificate paths used when wss_port is set.",
+            "fields": [
+                field("cert_path", "Certificate directory", "path",
+                      "Directory containing the TLS certificate and key files."),
+                field("wss_pem",   "Certificate file",     "text",
+                      "Filename of the TLS certificate chain (PEM format)."),
+                field("wss_key",   "Key file",             "text",
+                      "Filename of the TLS private key (PEM format)."),
+            ],
+        },
+        {
+            "id": "monitoring",
+            "title": "Monitoring",
+            "description": "Heartbeat timing and alert re-notification behaviour.",
+            "fields": [
+                field("interval",  "Heartbeat interval", "duration",
+                      "Expected time between heartbeat messages from each client."),
+                field("grace",     "Grace multiplier",   "number",
+                      "A host is marked overdue after interval × grace seconds of silence."),
+                field("threshold_renotify_interval", "Re-notify interval", "duration",
+                      "How often to re-send notifications for ongoing threshold alerts."),
+                field("autosave_interval", "Autosave interval", "duration",
+                      "How often the server saves its state to disk."),
+            ],
+        },
+        {
+            "id": "persistence",
+            "title": "Persistence & Logging",
+            "description": "State file and event log settings.",
+            "fields": [
+                field("pickfile", "State file",   "path",
+                      "Path to the pickle file used to persist host state across restarts."),
+                field("logfile",  "Event log",    "path",
+                      "Path to the event log file."),
+            ],
+        },
+        {
+            "id": "journal",
+            "title": "Message Journal",
+            "description": "All received heartbeat and plugin messages are journalled here.",
+            "fields": [
+                field("journal_enabled",     "Enabled",          "boolean",
+                      "Turn journalling on or off."),
+                field("journal_dir",         "Journal directory","path",
+                      "Directory where journal files are written."),
+                field("journal_file",        "Journal filename", "text",
+                      "Base filename for the journal (rotated copies get a numeric suffix)."),
+                field("journal_max_size",    "Max file size",    "size",
+                      "Rotate the journal when it exceeds this size."),
+                field("journal_max_backups", "Backup count",     "number",
+                      "Number of rotated journal files to keep."),
+            ],
+        },
+        {
+            "id": "dns",
+            "title": "Dynamic DNS",
+            "description": "nsupdate-based DNS registration for dynamic hosts.",
+            "fields": [
+                field("nsupdate_bin", "nsupdate binary", "path",
+                      "Full path to the nsupdate executable."),
+                field("dyndomains",   "Dynamic domains", "list",
+                      "DNS zones managed by nsupdate for dynamic hosts."),
+                field("drophosts",    "Drop hosts",      "list",
+                      "Hostnames to silently ignore — no state, no alerts."),
+            ],
+        },
+        {
+            "id": "users",
+            "title": "Users",
+            "description": "Accounts defined in the config file. Password hashes are never shown.",
+            "users": users_list,
+            "fields": [
+                field("default_owner", "Default owner", "text",
+                      "Username that owns hosts with no explicit owner. "
+                      "Falls back to the first admin user."),
+            ],
+        },
+        {
+            "id": "channels",
+            "title": "Notification Channels",
+            "description": "Named notification providers. Credentials are masked.",
+            "channels": notif_channels,
+            "fields": [
+                field("default_notification_channels", "Default channels", "list",
+                      "Channels used when a host does not specify its own."),
+            ],
+        },
+        {
+            "id": "hosts",
+            "title": "Hosts",
+            "description": "Host definitions loaded from the config file.",
+            "hosts": hosts_list,
+            "fields": [],
+        },
+        {
+            "id": "runtime",
+            "title": "Runtime",
+            "description": "Flags set at startup (require restart to change).",
+            "fields": [
+                field("foreground", "Foreground mode", "boolean",
+                      "Run in the foreground instead of daemonising."),
+                field("verbose",    "Verbose logging",  "boolean",
+                      "Enable verbose log output."),
+                field("debug",      "Debug level",      "number",
+                      "0 = off. Higher values increase log verbosity."),
+            ],
+        },
+    ]

hbd/server/static/style.css

@@ -139,4 +139,5 @@
       font-size: 9px;
       float: left;
   }
-  
+
+

hbd/server/templates/alerts.html

@@ -8,30 +8,6 @@
       background: #f5f5f5;
     }
 
-    .nav {
-      background: #fff;
-      padding: 15px;
-      margin-bottom: 20px;
-      box-shadow: 0 2px 4px rgba(0,0,0,0.1);
-      border-radius: 4px;
-    }
-
-    .nav a {
-      margin-right: 20px;
-      text-decoration: none;
-      color: #0066cc;
-      font-weight: 500;
-    }
-
-    .nav a:hover {
-      text-decoration: underline;
-    }
-
-    .nav a.active {
-      color: #333;
-      font-weight: bold;
-    }
-
     .container {
       max-width: 1400px;
       margin: 0 auto;
@@ -327,11 +303,7 @@
   </style>
 
   <body>
-    <div class="nav">
-      <a href="/live">Live Dashboard</a>
-      <a href="/plugins">Plugin Metrics</a>
-      <a href="/alerts" class="active">Alerts</a>
-    </div>
+    {% include 'nav.html' %}
 
     <div class="container">
       <h1>{{ header }}</h1>

hbd/server/templates/head.html

@@ -3,5 +3,59 @@
     <link rel="stylesheet" href="/static/style.css" type="text/css" />
     <link rel="icon" href="/static/images/favicon.ico" sizes="32x32" />
     <title>{{ title }}</title>
-    <script src="{{ extra_scripts }}"></script>
+    {% if extra_scripts %}<script src="{{ extra_scripts }}"></script>{% endif %}
+    <style>
+      /* Navigation bar — shared across all pages */
+      .nav {
+        background: #fff;
+        padding: 10px 15px;
+        margin-bottom: 10px;
+        box-shadow: 0 2px 4px rgba(0,0,0,.1);
+        border-radius: 4px;
+        display: flex;
+        align-items: center;
+        justify-content: space-between;
+      }
+      .nav-links { display: flex; align-items: center; }
+      .nav a {
+        margin-right: 20px;
+        text-decoration: none;
+        color: #0066cc;
+        font-weight: 500;
+        font-size: 0.9em;
+      }
+      .nav a:hover { text-decoration: underline; }
+      .nav a.active { color: #333; font-weight: bold; }
+      .nav-user {
+        display: flex;
+        align-items: center;
+        gap: 8px;
+        text-decoration: none;
+        color: #333;
+        font-size: 0.9em;
+        font-weight: 500;
+        padding: 4px 8px;
+        border-radius: 20px;
+        transition: background 0.15s;
+      }
+      .nav-user:hover { background: #f0f4ff; text-decoration: none; }
+      .nav-avatar {
+        width: 28px; height: 28px;
+        border-radius: 50%;
+        object-fit: cover;
+        flex-shrink: 0;
+      }
+      .nav-initials {
+        width: 28px; height: 28px;
+        border-radius: 50%;
+        background: #0066cc;
+        color: #fff;
+        display: flex;
+        align-items: center;
+        justify-content: center;
+        font-size: 0.75em;
+        font-weight: 700;
+        flex-shrink: 0;
+      }
+    </style>
 </head>

hbd/server/templates/live.html

@@ -4,42 +4,26 @@
 
   <style>
     body {
-      margin: 10px;
+      display: flex;
+      flex-direction: column;
+      height: 100vh;
+      box-sizing: border-box;
+      padding: 10px;
+      margin: 0;
       background: #f5f5f5;
       overflow: hidden;
     }
 
-    .nav {
-      background: #fff;
-      padding: 10px 15px;
-      margin-bottom: 10px;
-      box-shadow: 0 2px 4px rgba(0,0,0,0.1);
-      border-radius: 4px;
-    }
-
-    .nav a {
-      margin-right: 20px;
-      text-decoration: none;
-      color: #0066cc;
-      font-weight: 500;
-      font-size: 0.9em;
-    }
-
-    .nav a:hover {
-      text-decoration: underline;
-    }
-
-    .nav a.active {
-      color: #333;
-      font-weight: bold;
-    }
-
     .container {
+      flex: 1;
+      min-height: 0;
       max-width: 1600px;
+      width: 100%;
       margin: 0 auto;
-      max-height: calc(100vh - 120px);
-      overflow-y: auto;
-      padding-right: 10px;
+      display: flex;
+      flex-direction: column;
+      gap: 15px;
+      overflow: hidden;
     }
 
     h1 {
@@ -78,11 +62,12 @@
     }
 
     .log-section {
+      flex: 1;
+      min-height: 0;
       background: white;
       border-radius: 6px;
       padding: 15px;
       box-shadow: 0 1px 4px rgba(0,0,0,0.1);
-      max-height: 400px;
       overflow-y: auto;
     }
 
@@ -137,24 +122,20 @@
     }
 
     /* Scrollbar styling */
-    .container::-webkit-scrollbar,
     .log-section::-webkit-scrollbar {
       width: 8px;
     }
 
-    .container::-webkit-scrollbar-track,
     .log-section::-webkit-scrollbar-track {
       background: #f1f1f1;
       border-radius: 4px;
     }
 
-    .container::-webkit-scrollbar-thumb,
     .log-section::-webkit-scrollbar-thumb {
       background: #888;
       border-radius: 4px;
     }
 
-    .container::-webkit-scrollbar-thumb:hover,
     .log-section::-webkit-scrollbar-thumb:hover {
       background: #555;
     }
@@ -419,11 +400,7 @@
     WS_Connect();
   </script>
   <body>
-    <div class="nav">
-      <a href="/live" class="active">Live Dashboard</a>
-      <a href="/plugins">Plugin Metrics</a>
-      <a href="/alerts">Alerts</a>
-    </div>
+    {% include 'nav.html' %}
 
     {% include 'menu.html' %}
 

hbd/server/templates/menu.html

@@ -1,3 +1,2 @@
 <!-- <label for="drawer-toggle" id="drawer-toggle-label"></label>
 s<header>{{ header }}</header> -->
-

hbd/server/templates/nav.html

@@ -0,0 +1,19 @@
+<div class="nav">
+  <div class="nav-links">
+    <a href="/live"{% if active_page == "live" %} class="active"{% endif %}>Live Dashboard</a>
+    <a href="/plugins"{% if active_page == "plugins" %} class="active"{% endif %}>Plugin Metrics</a>
+    <a href="/alerts"{% if active_page == "alerts" %} class="active"{% endif %}>Alerts</a>
+    {% if current_user and current_user.admin %}
+    <a href="/settings"{% if active_page == "settings" %} class="active"{% endif %}>Settings</a>
+    {% endif %}
+  </div>
+  {% if current_user %}
+  <a href="/profile" class="nav-user{% if active_page == 'profile' %} active{% endif %}" title="{{ current_user.full_name or current_user.username }}">
+    {% if current_user.avatar %}
+    <img class="nav-avatar" src="{{ current_user.avatar_url }}" alt="{{ current_user.full_name or current_user.username }}">
+    {% else %}
+    <span class="nav-initials">{{ (current_user.full_name or current_user.username)[:1] | upper }}</span>
+    {% endif %}
+  </a>
+  {% endif %}
+</div>

hbd/server/templates/plugins.html

@@ -9,31 +9,6 @@
       overflow: hidden;
     }
 
-    .nav {
-      background: #fff;
-      padding: 10px 15px;
-      margin-bottom: 10px;
-      box-shadow: 0 2px 4px rgba(0,0,0,0.1);
-      border-radius: 4px;
-    }
-
-    .nav a {
-      margin-right: 20px;
-      text-decoration: none;
-      color: #0066cc;
-      font-weight: 500;
-      font-size: 0.9em;
-    }
-
-    .nav a:hover {
-      text-decoration: underline;
-    }
-
-    .nav a.active {
-      color: #333;
-      font-weight: bold;
-    }
-
     .container {
       max-width: 1400px;
       margin: 0 auto;
@@ -357,11 +332,7 @@
   </style>
 
   <body>
-    <div class="nav">
-      <a href="/live">Live Dashboard</a>
-      <a href="/plugins" class="active">Plugin Metrics</a>
-      <a href="/alerts">Alerts</a>
-    </div>
+    {% include 'nav.html' %}
 
     <div class="container">
       <h1>{{ header }}</h1>

hbd/server/templates/profile.html

@@ -0,0 +1,334 @@
+<!DOCTYPE html>
+<html>
+  {% include 'head.html' %}
+
+  <style>
+    body {
+      margin: 20px;
+      background: #f5f5f5;
+      font-family: 'Segoe UI', system-ui, sans-serif;
+    }
+
+    .container {
+      max-width: 900px;
+      margin: 0 auto;
+    }
+
+    h1 {
+      color: #333;
+      margin-bottom: 4px;
+      font-size: 1.5em;
+    }
+
+    .subtitle {
+      color: #666;
+      margin-bottom: 24px;
+      font-size: 0.9em;
+    }
+
+    /* ---- Profile card ---- */
+    .profile-card {
+      background: #fff;
+      border-radius: 8px;
+      box-shadow: 0 1px 6px rgba(0,0,0,0.1);
+      padding: 28px 32px;
+      margin-bottom: 24px;
+      display: flex;
+      align-items: center;
+      gap: 28px;
+    }
+
+    .avatar-large {
+      width: 80px;
+      height: 80px;
+      border-radius: 50%;
+      object-fit: cover;
+      flex-shrink: 0;
+      box-shadow: 0 2px 8px rgba(0,0,0,0.15);
+    }
+
+    .avatar-initials-large {
+      width: 80px;
+      height: 80px;
+      border-radius: 50%;
+      background: #0066cc;
+      color: #fff;
+      display: flex;
+      align-items: center;
+      justify-content: center;
+      font-size: 2em;
+      font-weight: 700;
+      flex-shrink: 0;
+      box-shadow: 0 2px 8px rgba(0,0,0,0.15);
+    }
+
+    .profile-info { flex: 1; }
+
+    .profile-name {
+      font-size: 1.4em;
+      font-weight: 700;
+      color: #222;
+      margin-bottom: 4px;
+    }
+
+    .profile-username {
+      font-size: 0.9em;
+      color: #666;
+      margin-bottom: 10px;
+    }
+
+    .badge {
+      display: inline-block;
+      padding: 2px 10px;
+      border-radius: 12px;
+      font-size: 0.78em;
+      font-weight: 600;
+      text-transform: uppercase;
+      letter-spacing: 0.4px;
+    }
+
+    .badge-admin { background: #e8f0fe; color: #1a73e8; }
+    .badge-user  { background: #f1f3f4; color: #555; }
+
+    .profile-logout {
+      margin-top: 14px;
+    }
+
+    .btn-logout {
+      display: inline-block;
+      padding: 6px 16px;
+      border-radius: 4px;
+      background: #f44336;
+      color: #fff;
+      font-size: 0.85em;
+      font-weight: 500;
+      text-decoration: none;
+      transition: background 0.15s;
+    }
+    .btn-logout:hover { background: #d32f2f; text-decoration: none; }
+
+    /* ---- Section cards ---- */
+    .section {
+      background: #fff;
+      border-radius: 8px;
+      box-shadow: 0 1px 6px rgba(0,0,0,0.1);
+      padding: 20px 24px;
+      margin-bottom: 20px;
+    }
+
+    .section h2 {
+      font-size: 1em;
+      font-weight: 700;
+      color: #333;
+      margin: 0 0 16px;
+      padding-bottom: 10px;
+      border-bottom: 1px solid #eee;
+      text-transform: uppercase;
+      letter-spacing: 0.5px;
+    }
+
+    /* ---- Settings rows ---- */
+    .settings-row {
+      display: flex;
+      align-items: baseline;
+      padding: 8px 0;
+      border-bottom: 1px solid #f5f5f5;
+      font-size: 0.9em;
+    }
+    .settings-row:last-child { border-bottom: none; }
+
+    .settings-label {
+      width: 180px;
+      flex-shrink: 0;
+      color: #666;
+      font-size: 0.88em;
+    }
+
+    .settings-value { color: #222; }
+
+    .settings-empty { color: #aaa; font-style: italic; }
+
+    /* ---- Host lists ---- */
+    .host-grid {
+      display: flex;
+      flex-wrap: wrap;
+      gap: 8px;
+    }
+
+    .host-chip {
+      display: inline-flex;
+      align-items: center;
+      gap: 6px;
+      padding: 4px 12px;
+      border-radius: 16px;
+      font-size: 0.85em;
+      font-weight: 500;
+      text-decoration: none;
+    }
+
+    .host-chip.owner   { background: #e8f5e9; color: #2e7d32; }
+    .host-chip.manager { background: #e3f2fd; color: #1565c0; }
+    .host-chip.monitor { background: #f3e5f5; color: #6a1b9a; }
+
+    .host-chip-dot {
+      width: 7px; height: 7px; border-radius: 50%;
+    }
+    .owner   .host-chip-dot { background: #2e7d32; }
+    .manager .host-chip-dot { background: #1565c0; }
+    .monitor .host-chip-dot { background: #6a1b9a; }
+
+    .no-hosts {
+      color: #aaa;
+      font-size: 0.9em;
+      font-style: italic;
+    }
+
+    /* ---- Notification channels ---- */
+    .channel-row {
+      display: flex;
+      align-items: center;
+      gap: 10px;
+      padding: 6px 0;
+      border-bottom: 1px solid #f5f5f5;
+      font-size: 0.9em;
+    }
+    .channel-row:last-child { border-bottom: none; }
+
+    .channel-type {
+      display: inline-block;
+      padding: 2px 8px;
+      border-radius: 10px;
+      font-size: 0.78em;
+      font-weight: 600;
+      text-transform: uppercase;
+      background: #f1f3f4;
+      color: #555;
+      min-width: 70px;
+      text-align: center;
+    }
+
+    .channel-name { color: #333; }
+  </style>
+
+  <body>
+    {% include 'nav.html' %}
+
+    <div class="container">
+      <h1>{{ header }}</h1>
+      <p class="subtitle">Your account settings and host access</p>
+
+      <!-- Profile card -->
+      <div class="profile-card">
+        {% if current_user and current_user.avatar %}
+        <img class="avatar-large" src="{{ current_user.avatar_url }}" alt="">
+        {% else %}
+        <div class="avatar-initials-large">
+          {{ ((current_user.full_name if current_user else '') or (current_user.username if current_user else '?'))[:1] | upper }}
+        </div>
+        {% endif %}
+
+        <div class="profile-info">
+          <div class="profile-name">{{ current_user.full_name if current_user and current_user.full_name else (current_user.username if current_user else '—') }}</div>
+          <div class="profile-username">@{{ current_user.username if current_user else '—' }}</div>
+          {% if current_user and current_user.admin %}
+          <span class="badge badge-admin">Admin</span>
+          {% else %}
+          <span class="badge badge-user">User</span>
+          {% endif %}
+          <div class="profile-logout">
+            <a href="/logout" class="btn-logout">Sign out</a>
+          </div>
+        </div>
+      </div>
+
+      <!-- Account settings -->
+      <div class="section">
+        <h2>Account</h2>
+        <div class="settings-row">
+          <span class="settings-label">Username</span>
+          <span class="settings-value">{{ current_user.username if current_user else '—' }}</span>
+        </div>
+        <div class="settings-row">
+          <span class="settings-label">Full name</span>
+          {% if current_user and current_user.full_name %}
+          <span class="settings-value">{{ current_user.full_name }}</span>
+          {% else %}
+          <span class="settings-empty">Not set</span>
+          {% endif %}
+        </div>
+        <div class="settings-row">
+          <span class="settings-label">Role</span>
+          <span class="settings-value">{{ 'Administrator' if current_user and current_user.admin else 'User' }}</span>
+        </div>
+        <div class="settings-row">
+          <span class="settings-label">Avatar</span>
+          {% if current_user and current_user.avatar %}
+          <span class="settings-value" style="word-break:break-all;">{{ current_user.avatar }}</span>
+          {% else %}
+          <span class="settings-empty">Not set (initials used)</span>
+          {% endif %}
+        </div>
+      </div>
+
+      <!-- Notification channels -->
+      <div class="section">
+        <h2>Notification Channels</h2>
+        {% if notification_channels %}
+        {% for ch in notification_channels %}
+        <div class="channel-row">
+          <span class="channel-type">{{ ch.type }}</span>
+          <span class="channel-name">{{ ch.name }}</span>
+        </div>
+        {% endfor %}
+        {% else %}
+        <span class="no-hosts">No personal notification channels configured.</span>
+        {% endif %}
+      </div>
+
+      <!-- Host access -->
+      <div class="section">
+        <h2>Host Access</h2>
+
+        <div class="settings-row" style="align-items: flex-start; padding-bottom: 14px;">
+          <span class="settings-label" style="padding-top: 2px;">Owner</span>
+          <div class="host-grid">
+            {% if owned_hosts %}
+            {% for h in owned_hosts %}
+            <span class="host-chip owner"><span class="host-chip-dot"></span>{{ h }}</span>
+            {% endfor %}
+            {% else %}
+            <span class="no-hosts">None</span>
+            {% endif %}
+          </div>
+        </div>
+
+        <div class="settings-row" style="align-items: flex-start; padding-bottom: 14px;">
+          <span class="settings-label" style="padding-top: 2px;">Manager</span>
+          <div class="host-grid">
+            {% if managed_hosts %}
+            {% for h in managed_hosts %}
+            <span class="host-chip manager"><span class="host-chip-dot"></span>{{ h }}</span>
+            {% endfor %}
+            {% else %}
+            <span class="no-hosts">None</span>
+            {% endif %}
+          </div>
+        </div>
+
+        <div class="settings-row" style="align-items: flex-start; padding-bottom: 4px;">
+          <span class="settings-label" style="padding-top: 2px;">Monitor</span>
+          <div class="host-grid">
+            {% if monitored_hosts %}
+            {% for h in monitored_hosts %}
+            <span class="host-chip monitor"><span class="host-chip-dot"></span>{{ h }}</span>
+            {% endfor %}
+            {% else %}
+            <span class="no-hosts">None</span>
+            {% endif %}
+          </div>
+        </div>
+      </div>
+
+    </div>
+  </body>
+</html>

hbd/server/templates/settings.html

@@ -0,0 +1,433 @@
+<!DOCTYPE html>
+<html>
+  {% include 'head.html' %}
+
+  <style>
+    html, body {
+      overflow: visible;
+    }
+
+    body {
+      margin: 20px;
+      background: #f5f5f5;
+      font-family: 'Segoe UI', system-ui, sans-serif;
+    }
+
+    .container {
+      max-width: 960px;
+      margin: 0 auto;
+    }
+
+    h1 { color: #333; margin-bottom: 4px; font-size: 1.5em; }
+    .subtitle { color: #666; margin-bottom: 24px; font-size: 0.9em; }
+
+    /* ---- Sidebar + content layout ---- */
+    .settings-layout {
+      display: flex;
+      gap: 24px;
+      align-items: flex-start;
+    }
+
+    .settings-sidebar {
+      width: 180px;
+      flex-shrink: 0;
+      position: sticky;
+      top: 20px;
+    }
+
+    .sidebar-nav a {
+      display: block;
+      padding: 6px 10px;
+      border-radius: 4px;
+      text-decoration: none;
+      font-size: 0.85em;
+      color: #444;
+      margin-bottom: 2px;
+      transition: background 0.1s, color 0.1s;
+    }
+    .sidebar-nav a:hover { background: #e8eaf6; color: #1a237e; }
+    .sidebar-nav a.active { background: #e3f2fd; color: #0066cc; font-weight: 600; }
+
+    .settings-main { flex: 1; min-width: 0; }
+
+    /* ---- Section card ---- */
+    .section {
+      background: #fff;
+      border-radius: 8px;
+      box-shadow: 0 1px 4px rgba(0,0,0,.08);
+      margin-bottom: 24px;
+      overflow: hidden;
+    }
+
+    .section-header {
+      padding: 14px 20px 12px;
+      border-bottom: 1px solid #eee;
+    }
+
+    .section-title {
+      font-size: 0.95em;
+      font-weight: 700;
+      color: #222;
+      text-transform: uppercase;
+      letter-spacing: 0.5px;
+      margin: 0 0 3px;
+    }
+
+    .section-desc {
+      font-size: 0.82em;
+      color: #888;
+      margin: 0;
+    }
+
+    /* ---- Field rows ---- */
+    .field-row {
+      display: flex;
+      align-items: baseline;
+      padding: 10px 20px;
+      border-bottom: 1px solid #f5f5f5;
+      gap: 16px;
+    }
+    .field-row:last-child { border-bottom: none; }
+
+    .field-label {
+      width: 200px;
+      flex-shrink: 0;
+      font-size: 0.88em;
+      font-weight: 500;
+      color: #444;
+    }
+
+    .field-body { flex: 1; min-width: 0; }
+
+    .field-value {
+      font-size: 0.9em;
+      color: #222;
+      word-break: break-all;
+    }
+
+    .field-desc {
+      font-size: 0.78em;
+      color: #999;
+      margin-top: 2px;
+    }
+
+    /* ---- Value type renderers ---- */
+    .val-boolean {
+      display: inline-block;
+      padding: 2px 9px;
+      border-radius: 10px;
+      font-size: 0.8em;
+      font-weight: 600;
+    }
+    .val-boolean.on  { background: #e8f5e9; color: #2e7d32; }
+    .val-boolean.off { background: #fce4ec; color: #c62828; }
+
+    .val-masked {
+      font-family: monospace;
+      color: #bbb;
+      letter-spacing: 2px;
+    }
+
+    .val-list { display: flex; flex-wrap: wrap; gap: 5px; }
+    .val-tag {
+      display: inline-block;
+      padding: 2px 9px;
+      background: #e8eaf6;
+      color: #283593;
+      border-radius: 10px;
+      font-size: 0.8em;
+    }
+    .val-empty { color: #ccc; font-style: italic; font-size: 0.88em; }
+
+    /* ---- Users table ---- */
+    .mini-table {
+      width: 100%;
+      border-collapse: collapse;
+      font-size: 0.875em;
+    }
+    .mini-table th {
+      background: #f5f5f5;
+      padding: 7px 12px;
+      text-align: left;
+      font-weight: 600;
+      color: #555;
+      font-size: 0.82em;
+      text-transform: uppercase;
+      letter-spacing: 0.4px;
+      border-bottom: 1px solid #e0e0e0;
+    }
+    .mini-table td {
+      padding: 7px 12px;
+      border-bottom: 1px solid #f0f0f0;
+      color: #333;
+      vertical-align: middle;
+    }
+    .mini-table tbody tr:last-child td { border-bottom: none; }
+    .mini-table tbody tr:hover { background: #fafafa; }
+
+    .badge {
+      display: inline-block;
+      padding: 1px 8px;
+      border-radius: 10px;
+      font-size: 0.75em;
+      font-weight: 600;
+    }
+    .badge-admin { background: #e8f0fe; color: #1a73e8; }
+    .badge-user  { background: #f1f3f4; color: #666; }
+
+    /* ---- Notification channels ---- */
+    .channel-card {
+      border: 1px solid #e8eaf6;
+      border-radius: 6px;
+      margin: 12px 20px;
+      overflow: hidden;
+    }
+
+    .channel-header {
+      display: flex;
+      align-items: center;
+      gap: 10px;
+      padding: 9px 14px;
+      background: #f8f9ff;
+      border-bottom: 1px solid #e8eaf6;
+    }
+
+    .channel-name-text { font-weight: 600; font-size: 0.9em; color: #222; }
+
+    .ch-type-badge {
+      padding: 2px 8px;
+      border-radius: 8px;
+      font-size: 0.75em;
+      font-weight: 600;
+      background: #e8eaf6;
+      color: #3949ab;
+    }
+
+    .channel-fields { padding: 6px 0; }
+
+    .channel-field {
+      display: flex;
+      padding: 5px 14px;
+      font-size: 0.85em;
+      border-bottom: 1px solid #f5f5f5;
+      gap: 12px;
+    }
+    .channel-field:last-child { border-bottom: none; }
+    .channel-field-label { width: 130px; flex-shrink: 0; color: #777; }
+    .channel-field-value { color: #333; word-break: break-all; }
+
+    /* ---- Hosts table ---- */
+    .host-bool { text-align: center; }
+    .dot-yes { color: #2e7d32; font-size: 1.1em; }
+    .dot-no  { color: #ddd;    font-size: 1.1em; }
+  </style>
+
+  <body>
+    {% include 'nav.html' %}
+
+    <div class="container">
+      <h1>Settings</h1>
+      <p class="subtitle">Current server configuration — read from the config file at startup.</p>
+
+      <div class="settings-layout">
+
+        <!-- Sidebar navigation -->
+        <nav class="settings-sidebar">
+          <div class="sidebar-nav" id="sidebar-nav">
+            {% for section in sections %}
+            <a href="#{{ section.id }}">{{ section.title }}</a>
+            {% endfor %}
+          </div>
+        </nav>
+
+        <!-- Main content -->
+        <div class="settings-main">
+          {% for section in sections %}
+          <div class="section" id="{{ section.id }}">
+            <div class="section-header">
+              <p class="section-title">{{ section.title }}</p>
+              {% if section.description %}<p class="section-desc">{{ section.description }}</p>{% endif %}
+            </div>
+
+            {# ---- Standard field rows ---- #}
+            {% for f in section.fields %}
+            <div class="field-row">
+              <div class="field-label">{{ f.label }}</div>
+              <div class="field-body">
+                {% if f.sensitive %}
+                  <div class="field-value"><span class="val-masked">••••••••</span></div>
+                {% elif f.type == "boolean" %}
+                  <div class="field-value">
+                    <span class="val-boolean {{ 'on' if f.value else 'off' }}">
+                      {{ 'Enabled' if f.value else 'Disabled' }}
+                    </span>
+                  </div>
+                {% elif f.type == "list" %}
+                  <div class="field-value">
+                    {% if f.value %}
+                    <span class="val-list">
+                      {% for item in f.value %}<span class="val-tag">{{ item }}</span>{% endfor %}
+                    </span>
+                    {% else %}
+                    <span class="val-empty">None</span>
+                    {% endif %}
+                  </div>
+                {% elif f.value is none or f.value == "" %}
+                  <div class="field-value"><span class="val-empty">Not set</span></div>
+                {% else %}
+                  <div class="field-value">{{ f.value }}</div>
+                {% endif %}
+                {% if f.description %}
+                <div class="field-desc">{{ f.description }}</div>
+                {% endif %}
+              </div>
+            </div>
+            {% endfor %}
+
+            {# ---- Users section ---- #}
+            {% if section.id == "users" and section.users %}
+            <div style="padding: 0 0 4px;">
+              <table class="mini-table">
+                <thead>
+                  <tr>
+                    <th>Username</th>
+                    <th>Full Name</th>
+                    <th>Role</th>
+                    <th>Avatar</th>
+                    <th>Channels</th>
+                  </tr>
+                </thead>
+                <tbody>
+                  {% for u in section.users %}
+                  <tr>
+                    <td><strong>{{ u.username }}</strong></td>
+                    <td>{{ u.full_name or '—' }}</td>
+                    <td>
+                      {% if u.admin %}
+                      <span class="badge badge-admin">Admin</span>
+                      {% else %}
+                      <span class="badge badge-user">User</span>
+                      {% endif %}
+                    </td>
+                    <td style="font-size:0.8em; color:#888;">
+                      {% if u.avatar %}{{ u.avatar }}{% else %}—{% endif %}
+                    </td>
+                    <td>
+                      {% if u.notification_channels %}
+                      <span class="val-list">
+                        {% for ch in u.notification_channels %}
+                        <span class="val-tag">{{ ch }}</span>
+                        {% endfor %}
+                      </span>
+                      {% else %}—{% endif %}
+                    </td>
+                  </tr>
+                  {% endfor %}
+                </tbody>
+              </table>
+            </div>
+            {% endif %}
+
+            {# ---- Notification channels section ---- #}
+            {% if section.id == "channels" %}
+            {% for ch in section.channels %}
+            <div class="channel-card">
+              <div class="channel-header">
+                <span class="channel-name-text">{{ ch.name }}</span>
+                <span class="ch-type-badge">{{ ch.type_label }}</span>
+              </div>
+              <div class="channel-fields">
+                {% for cf in ch.fields %}
+                <div class="channel-field">
+                  <span class="channel-field-label">{{ cf.label }}</span>
+                  <span class="channel-field-value">
+                    {% if cf.sensitive %}
+                    <span class="val-masked">••••••••</span>
+                    {% elif cf.value is iterable and cf.value is not string %}
+                    {{ cf.value | join(', ') }}
+                    {% else %}
+                    {{ cf.value }}
+                    {% endif %}
+                  </span>
+                </div>
+                {% endfor %}
+              </div>
+            </div>
+            {% endfor %}
+            {% if not section.channels %}
+            <div class="field-row"><span class="val-empty">No notification channels configured.</span></div>
+            {% endif %}
+            {% endif %}
+
+            {# ---- Hosts section ---- #}
+            {% if section.id == "hosts" %}
+            {% if section.hosts %}
+            <div style="overflow-x: auto;">
+              <table class="mini-table">
+                <thead>
+                  <tr>
+                    <th>Host</th>
+                    <th>Watch</th>
+                    <th>DynDNS</th>
+                    <th>Owner</th>
+                    <th>Threshold config</th>
+                    <th>Channels</th>
+                  </tr>
+                </thead>
+                <tbody>
+                  {% for h in section.hosts %}
+                  <tr>
+                    <td><strong>{{ h.name }}</strong></td>
+                    <td class="host-bool">
+                      <span class="{{ 'dot-yes' if h.watch else 'dot-no' }}">●</span>
+                    </td>
+                    <td class="host-bool">
+                      <span class="{{ 'dot-yes' if h.dyndns else 'dot-no' }}">●</span>
+                    </td>
+                    <td>{{ h.owner or '—' }}</td>
+                    <td>{{ h.threshold_config or '—' }}</td>
+                    <td>
+                      {% if h.notification_channels %}
+                      <span class="val-list">
+                        {% for ch in h.notification_channels %}
+                        <span class="val-tag">{{ ch }}</span>
+                        {% endfor %}
+                      </span>
+                      {% else %}—{% endif %}
+                    </td>
+                  </tr>
+                  {% endfor %}
+                </tbody>
+              </table>
+            </div>
+            {% else %}
+            <div class="field-row"><span class="val-empty">No hosts defined in config.</span></div>
+            {% endif %}
+            {% endif %}
+
+          </div>{# /section #}
+          {% endfor %}
+        </div>{# /settings-main #}
+      </div>{# /settings-layout #}
+    </div>{# /container #}
+
+    <script>
+      // Highlight sidebar link for the section currently in view
+      const sections = document.querySelectorAll('.section');
+      const navLinks = document.querySelectorAll('.sidebar-nav a');
+
+      const observer = new IntersectionObserver(entries => {
+        entries.forEach(entry => {
+          if (entry.isIntersecting) {
+            const id = entry.target.id;
+            navLinks.forEach(a => {
+              a.classList.toggle('active', a.getAttribute('href') === '#' + id);
+            });
+          }
+        });
+      }, { threshold: 0.25 });
+
+      sections.forEach(s => observer.observe(s));
+    </script>
+  </body>
+</html>

hbd/server/threshold.py

@@ -14,6 +14,7 @@ import time
 from enum import Enum
 from typing import Dict, Any, Optional, Tuple, Callable
 from . import notify as notify_mod
+from .config import THRESHOLD_DEFAULTS
 
 logger = logging.getLogger(__name__)
 eventlog = notify_mod.eventlog
@@ -38,11 +39,11 @@ class ComparisonOperator(Enum):
 
 class AlertState:
     """Represents the current alert state for a specific metric."""
-    
+
     def __init__(self, metric_path: str):
         """
         Initialize alert state.
-        
+
         Args:
             metric_path: Full path to metric (e.g., "cpu_monitor.cpu_percent")
         """
@@ -58,6 +59,7 @@ class AlertState:
         self.formatted_message = None  # Formatted display message for UI
         self.acknowledged = False  # Whether alert has been acknowledged
         self.acknowledged_at = None  # Timestamp when acknowledged
+        self.consecutive_count = 0  # Consecutive exceedances while still OK (for count gating)
     
     def update(
         self, 
@@ -118,8 +120,11 @@ class AlertState:
         
         # Helper to sanitize numeric values for JSON (handle inf/nan)
         def sanitize_value(val):
-            if isinstance(val, float) and (math.isinf(val) or math.isnan(val)):
-                return None
+            if isinstance(val, float):
+                if math.isinf(val):
+                    return "overdue"
+                if math.isnan(val):
+                    return None
             return val
         
         result = {
@@ -146,6 +151,12 @@ class AlertState:
         
         return result
     
+    def __setstate__(self, state):
+        """Restore from pickle, backfilling fields added after the pickle was written."""
+        self.__dict__.update(state)
+        if not hasattr(self, 'consecutive_count'):
+            self.consecutive_count = 0
+
     def acknowledge(self):
         """Acknowledge this alert to stop reminder notifications."""
         self.acknowledged = True
@@ -157,7 +168,7 @@ class AlertState:
 
 class ThresholdConfig:
     """Configuration for a single threshold check."""
-    
+
     def __init__(
         self,
         metric_path: str,
@@ -167,10 +178,11 @@ class ThresholdConfig:
         operator: str = ">",
         hysteresis: float = 0.0,
         enabled: bool = True,
+        count: int = 1,
     ):
         """
         Initialize threshold configuration.
-        
+
         Args:
             metric_path: Full path to metric (e.g., "cpu_monitor.cpu_percent")
             warning: Warning threshold value
@@ -178,6 +190,7 @@ class ThresholdConfig:
             operator: Comparison operator (>, >=, <, <=, ==, !=)
             hysteresis: Hysteresis percentage to prevent flapping (0.0-1.0)
             enabled: Whether this threshold is enabled
+            count: Number of consecutive exceedances required before alerting (default 1)
         """
         self.metric_path = metric_path
         self.warning = warning
@@ -185,6 +198,7 @@ class ThresholdConfig:
         self.enabled = enabled
         self.hysteresis = hysteresis
         self.display = display
+        self.count = max(1, int(count))
         
         # Parse operator
         try:
@@ -386,29 +400,49 @@ class ThresholdChecker:
     def _parse_multi_config(self, config: Dict[str, Any]):
         """Parse multiple named threshold configurations."""
         threshold_configs = config.get("threshold_configs", {})
-        
+
         if not threshold_configs:
             logger.info("No threshold configurations defined")
             return
-        
-        # Parse each named configuration
+
+        # Build effective_defaults: THRESHOLD_DEFAULTS merged with the 'default' config (if present).
+        # All other configs inherit any metric not explicitly defined from effective_defaults.
+        effective_defaults: Dict[str, ThresholdConfig] = {}
+        for plugin_name, plugin_thresholds in THRESHOLD_DEFAULTS.get("thresholds", {}).items():
+            if isinstance(plugin_thresholds, dict):
+                self._parse_plugin_thresholds(plugin_name, plugin_thresholds, target_dict=effective_defaults)
+
+        if "default" in threshold_configs:
+            default_data = threshold_configs["default"]
+            if isinstance(default_data, dict) and "thresholds" in default_data:
+                for plugin_name, plugin_thresholds in default_data["thresholds"].items():
+                    if isinstance(plugin_thresholds, dict):
+                        self._parse_plugin_thresholds(plugin_name, plugin_thresholds, target_dict=effective_defaults)
+
+        self.threshold_configs["default"] = dict(effective_defaults)
+        logger.info("Registered 'default' threshold config with %d metrics", len(effective_defaults))
+
+        # Parse each named configuration, seeding it with effective_defaults first
         for config_name, config_data in threshold_configs.items():
+            if config_name == "default":
+                continue  # already handled above
+
             if not isinstance(config_data, dict):
                 logger.warning("Invalid threshold config '%s', skipping", config_name)
                 continue
-            
+
             if "thresholds" not in config_data:
                 logger.warning("No thresholds in config '%s', skipping", config_name)
                 continue
-            
+
             logger.info("Parsing threshold configuration: %s", config_name)
-            self.threshold_configs[config_name] = {}
-            
+            self.threshold_configs[config_name] = dict(effective_defaults)
+
             thresholds_config = config_data["thresholds"]
             for plugin_name, plugin_thresholds in thresholds_config.items():
                 if not isinstance(plugin_thresholds, dict):
                     continue
-                
+
                 self._parse_plugin_thresholds(
                     plugin_name,
                     plugin_thresholds,
@@ -600,11 +634,12 @@ class ThresholdChecker:
         hysteresis = rtt_thresholds.get("hysteresis", 0.1)  # 10% default
         enabled = rtt_thresholds.get("enabled", True)
         display = rtt_thresholds.get("display")
-        
+        count = rtt_thresholds.get("count", 1)
+
         if warning is None and critical is None:
             logger.warning("No RTT thresholds defined, skipping")
             return
-        
+
         threshold = ThresholdConfig(
             metric_path=metric_path,
             warning=warning,
@@ -612,14 +647,16 @@ class ThresholdChecker:
             operator=operator,
             hysteresis=hysteresis,
             enabled=enabled,
-            display=display
+            display=display,
+            count=count,
         )
-        
+
         target_dict[metric_path] = threshold
         logger.debug(
-            "Registered RTT threshold: warn=%s ms, crit=%s ms",
+            "Registered RTT threshold: warn=%s ms, crit=%s ms, count=%d",
             warning,
-            critical
+            critical,
+            count,
         )
     
     def get_thresholds_for_host(self, host_name: str) -> Dict[str, ThresholdConfig]:
@@ -691,14 +728,34 @@ class ThresholdChecker:
             value,
             alert_state.level
         )
-        
+
+        # Apply consecutive-count gating: when currently OK, require threshold.count
+        # consecutive exceedances before escalating to WARNING/CRITICAL.
+        if new_level == AlertLevel.OK:
+            # Value is fine (or recovered) — reset the pending counter immediately.
+            alert_state.consecutive_count = 0
+        elif alert_state.level == AlertLevel.OK and new_level != AlertLevel.OK:
+            # First time we exceed while still OK: count up.
+            alert_state.consecutive_count += 1
+            if alert_state.consecutive_count < threshold.count:
+                logger.debug(
+                    "RTT threshold exceeded %d/%d consecutive times for %s on %s",
+                    alert_state.consecutive_count,
+                    threshold.count,
+                    metric_path,
+                    host_name,
+                )
+                return None
+            # Count reached — fire the alert and reset the counter.
+            alert_state.consecutive_count = 0
+
         # Determine which threshold was exceeded
         threshold_value = None
         if new_level == AlertLevel.CRITICAL and threshold.critical is not None:
             threshold_value = threshold.critical
         elif new_level == AlertLevel.WARNING and threshold.warning is not None:
             threshold_value = threshold.warning
-        
+
         # Update state and check for changes
         old_level = alert_state.level
         if alert_state.update(new_level, value, threshold_value, threshold.operator.value):
@@ -711,7 +768,7 @@ class ThresholdChecker:
         elif new_level != AlertLevel.OK:
             # Check if we should re-notify
             self._check_renotify(host_name, alert_state, metric_path, value, threshold, None)
-        
+
         return None
     def check_plugin_data(
         self,
@@ -884,48 +941,50 @@ class ThresholdChecker:
         # Format operator symbol
         op_symbol = threshold.operator.value
         
+        # Use a display-friendly value (inf is the sentinel for "overdue")
+        import math
+        display_value = "overdue" if isinstance(value, float) and math.isinf(value) else value
+
         # Format message
         if new_level == AlertLevel.OK:
-            lvl = "RECOVERED" 
-            message = f"{metric_path} = {value} ({old_level.name} -> OK)"
+            lvl = "RECOVERED"
+            message = f"{metric_path} = {display_value} ({old_level.name} -> OK)"
         elif new_level == AlertLevel.WARNING:
             lvl = "WARNING"
             if threshold_value is not None:
-                # Use display format string
                 threshold_info = self._format_display(
                     threshold.display,
-                    value=value,
+                    value=display_value,
                     threshold_value=threshold_value,
                     op_symbol=op_symbol,
                     plugin_data=plugin_data
                 )
-                message = f"{metric_path} = {value} {threshold_info}"
+                message = f"{metric_path} = {display_value} {threshold_info}"
             else:
-                message = f"{metric_path} = {value}"
+                message = f"{metric_path} = {display_value}"
         elif new_level == AlertLevel.CRITICAL:
             lvl = "CRITICAL"
             if threshold_value is not None:
-                # Use display format string
                 threshold_info = self._format_display(
                     threshold.display,
-                    value=value,
+                    value=display_value,
                     threshold_value=threshold_value,
                     op_symbol=op_symbol,
                     plugin_data=plugin_data
                 )
-                message = f"{metric_path} = {value} {threshold_info}"
+                message = f"{metric_path} = {display_value} {threshold_info}"
             else:
-                message = f"{metric_path} = {value}"
+                message = f"{metric_path} = {display_value}"
         else:
             lvl = "UNKNOWN"
-            message = f"{metric_path} = {value}"
+            message = f"{metric_path} = {display_value}"
         
         # Return the formatted threshold info for storing in AlertState
         formatted_threshold_msg = None
         if threshold_value is not None and new_level != AlertLevel.OK:
             formatted_threshold_msg = self._format_display(
                 threshold.display,
-                value=value,
+                value=display_value,
                 threshold_value=threshold_value,
                 op_symbol=op_symbol,
                 plugin_data=plugin_data
@@ -1037,9 +1096,9 @@ class ThresholdChecker:
             threshold: Threshold configuration
             plugin_data: Optional dictionary of all plugin data fields
         """
-        if alert_state.level == AlertLevel.OK:
+        if alert_state.level != AlertLevel.CRITICAL:
             return
-        
+
         # Skip reminders if alert has been acknowledged
         if alert_state.acknowledged:
             return

hbd/server/udp.py

@@ -7,6 +7,8 @@ import time
 import zlib
 import logging
 
+from platform import system as platform_system
+
 from ..common.proto import stodict, oldmtodict
 from ..common.utils import dur
 from . import notify as notify_mod
@@ -16,9 +18,18 @@ eventlog = notify_mod.eventlog
 
 # SO_TIMESTAMP: kernel attaches a struct timeval to each received datagram.
 # Supported on Linux, FreeBSD, and macOS.  The constant is not exposed by
-# Python's socket module on all platforms, so fall back to the Linux value (29)
-# when absent.
-_SO_TIMESTAMP = getattr(socket, 'SO_TIMESTAMP', 29)
+# Python's socket module on all platforms 
+platform = platform_system()
+if platform == "Darwin":
+    _SO_TIMESTAMP = 1024  # SO_TIMESTAMP on macOS (not in Python's socket module)
+elif platform == "Linux":
+    _SO_TIMESTAMP = 29  # Linux value (not in older Python versions)
+elif platform == "FreeBSD":
+     _SO_TIMESTAMP = 32  # FreeBSD value (not in older Python versions)
+else:
+    logger.warning("SO_TIMESTAMP may not be supported on this platform (%s)", platform)
+    _SO_TIMESTAMP = None
+
 # struct timeval uses two native C longs: tv_sec and tv_usec
 _TIMEVAL = struct.Struct('@ll')
 
@@ -222,11 +233,15 @@ def restore_connection_timers(hbdclass, ctx):
 
             if state == hbdclass.Connection.UP and interval > 0:
                 elapsed = now - conn.lastbeat
-                remaining = max(1.0, (interval + grace) - elapsed)
+                # Give hosts one full (interval + grace) of extra time on startup
+                # so hosts that were silent while hbd was down are not immediately
+                # flagged as overdue before they have a chance to check in.
+                startup_grace = interval + grace
+                remaining = max(startup_grace, 2 * startup_grace - elapsed)
                 conn.reset_overdue_timer(remaining, on_overdue)
                 logger.debug(
-                    "Restored UP timer %s/%s: %.0fs remaining (elapsed %.0fs)",
-                    uname, afam, remaining, elapsed,
+                    "Restored UP timer %s/%s: %.0fs remaining (elapsed %.0fs, startup grace %.0fs)",
+                    uname, afam, remaining, elapsed, startup_grace,
                 )
                 restored += 1
 
@@ -297,6 +312,9 @@ def handle_datagram(msg: dict, addr, transport, ctx: dict):
         # Use new config function to check dyndns
         dyndnshosts = config_mod.get_dyndnshosts(cfg)
         host.dyn = uname in dyndnshosts
+        # Apply user-access settings from config
+        access = config_mod.get_host_access(cfg, uname)
+        host.apply_access(access["owner"], access["managers"], access["monitors"])
         if verbose:
             print(("XX: New host, num now %s" % (len(hbdcls.Host.hosts))))
         newh = True
@@ -394,13 +412,16 @@ def handle_datagram(msg: dict, addr, transport, ctx: dict):
     if conn.getstate() != hbdcls.Connection.UP:
         lasts = conn.state
         d = conn.newstate(hbdcls.Connection.UP, now)
-        if d == 0 or lasts == "unknown":
-            m = "%s is up" % (conn.afam)
-        else:
-            m = "%s back after being %s for %s" % (conn.afam, lasts, dur(d))
-        eventlog(uname, "RECOVER", m)
-        if uname in watchhosts:
-            notify_mod.pushmsg_for_host(uname, "%s %s is back" % (uname, conn.afam))
+        # Don't log/notify RECOVER for a brand-new host seen for the first time —
+        # it was never down, it just hasn't been seen before.
+        if not newh:
+            if d == 0 or lasts == "unknown":
+                m = "%s is up" % (conn.afam)
+            else:
+                m = "%s back after being %s for %s" % (conn.afam, lasts, dur(d))
+            eventlog(uname, "RECOVER", m)
+            if uname in watchhosts:
+                notify_mod.pushmsg_for_host(uname, "%s %s is back" % (uname, conn.afam))
 
     if boot or newh:
         host.upcount = host.doesack

hbd/server/users.py

@@ -0,0 +1,242 @@
+"""User management: loading, authentication, and session tracking.
+
+Users are defined in the config file under the ``users`` key:
+
+    users:
+      alice:
+        full_name: Alice Smith
+        avatar: /path/to/avatar.png   # file path, URL, or base64 data URI
+        password: pbkdf2:sha256:...   # generated with: hbd passwd
+        admin: true                   # optional server-level admin
+        notification_channels: [pushover_standard]
+
+Roles are assigned per-host:
+
+    hosts:
+      webserver01:
+        owner: alice
+        managers: [bob]
+        monitors: [carol]
+
+If no users are defined the server runs in unauthenticated mode (backwards
+compatible).  When users are defined every API call must carry a valid session
+token in an ``Authorization: Bearer <token>`` or ``X-Auth-Token`` header,
+obtained via ``POST /api/0/auth/login``.
+"""
+
+import hashlib
+import hmac
+import logging
+import secrets
+import time
+
+logger = logging.getLogger(__name__)
+
+# Session lifetime in seconds (24 hours).
+SESSION_TTL = 86400
+
+# Global session store: token -> {"username": str, "expires": float, "created": float}
+_sessions: dict = {}
+
+
+# ---------------------------------------------------------------------------
+# User class
+# ---------------------------------------------------------------------------
+
+class User:
+    def __init__(
+        self,
+        username: str,
+        full_name: str = "",
+        avatar: str = "",
+        password_hash: str = "",
+        admin: bool = False,
+        notification_channels: list | None = None,
+    ):
+        self.username = username
+        self.full_name = full_name
+        self.avatar = avatar
+        self.password_hash = password_hash
+        self.admin = admin
+        self.notification_channels: list = notification_channels or []
+
+    def check_password(self, password: str) -> bool:
+        if not self.password_hash:
+            return False
+        return _verify_password(password, self.password_hash)
+
+    def avatar_is_local(self) -> bool:
+        """Return True when the avatar is a local filesystem path (starts with '/')."""
+        return bool(self.avatar and self.avatar.startswith("/"))
+
+    def avatar_url(self) -> str:
+        """Return the URL to use as an <img src>.
+
+        Local file paths are served via the /api/0/users/{username}/avatar
+        endpoint.  External URLs and data URIs are returned as-is.
+        """
+        if self.avatar_is_local():
+            return f"/api/0/users/{self.username}/avatar"
+        return self.avatar
+
+    def to_dict(self) -> dict:
+        return {
+            "username": self.username,
+            "full_name": self.full_name,
+            "avatar": self.avatar,
+            "avatar_url": self.avatar_url(),
+            "admin": self.admin,
+            "notification_channels": self.notification_channels,
+        }
+
+
+# ---------------------------------------------------------------------------
+# Password hashing  (PBKDF2-HMAC-SHA256, stdlib only)
+# ---------------------------------------------------------------------------
+
+def hash_password(password: str) -> str:
+    """Return a storable hash for *password*.
+
+    Format: ``pbkdf2:sha256:<iterations>:<salt>:<hex-digest>``
+
+    Use this to generate the ``password`` value in the config file::
+
+        python -c "from hbd.server.users import hash_password; print(hash_password('secret'))"
+
+    Or via the CLI::
+
+        hbd passwd
+    """
+    salt = secrets.token_hex(16)
+    iterations = 260_000
+    dk = hashlib.pbkdf2_hmac(
+        "sha256", password.encode("utf-8"), salt.encode("utf-8"), iterations
+    )
+    return f"pbkdf2:sha256:{iterations}:{salt}:{dk.hex()}"
+
+
+def _verify_password(password: str, stored_hash: str) -> bool:
+    """Return True if *password* matches *stored_hash*."""
+    try:
+        parts = stored_hash.split(":")
+        if len(parts) != 5 or parts[0] != "pbkdf2" or parts[1] != "sha256":
+            return False
+        _, _, iterations_str, salt, expected_hex = parts
+        iterations = int(iterations_str)
+        dk = hashlib.pbkdf2_hmac(
+            "sha256", password.encode("utf-8"), salt.encode("utf-8"), iterations
+        )
+        return hmac.compare_digest(dk.hex(), expected_hex)
+    except Exception:
+        return False
+
+
+# ---------------------------------------------------------------------------
+# Global user registry
+# ---------------------------------------------------------------------------
+
+# username -> User
+users: dict = {}
+
+
+def load_users(config: dict) -> dict:
+    """Populate the global user registry from *config*.
+
+    Called once at startup and again on SIGHUP config reload.
+    Returns the new ``users`` dict.
+    """
+    global users
+    users_cfg = config.get("users", {})
+    if not isinstance(users_cfg, dict):
+        users = {}
+        return users
+
+    result: dict = {}
+    for username, attrs in users_cfg.items():
+        if not isinstance(attrs, dict):
+            logger.warning("Skipping user %r: expected a mapping", username)
+            continue
+        result[username] = User(
+            username=username,
+            full_name=attrs.get("full_name", ""),
+            avatar=attrs.get("avatar", ""),
+            password_hash=attrs.get("password", ""),
+            admin=bool(attrs.get("admin", False)),
+            notification_channels=attrs.get("notification_channels", []),
+        )
+
+    users = result
+    logger.info("Loaded %d user(s) from config", len(users))
+    return users
+
+
+def users_enabled() -> bool:
+    """Return True if at least one user is configured (auth-required mode)."""
+    return bool(users)
+
+
+def get_user(username: str) -> "User | None":
+    return users.get(username)
+
+
+def authenticate(username: str, password: str) -> "User | None":
+    """Return the User if credentials are valid, else None."""
+    user = users.get(username)
+    if user and user.check_password(password):
+        return user
+    return None
+
+
+# ---------------------------------------------------------------------------
+# Session management
+# ---------------------------------------------------------------------------
+
+def create_session(username: str) -> str:
+    """Create a new session for *username* and return the opaque token."""
+    _purge_expired_sessions()
+    token = secrets.token_hex(32)
+    _sessions[token] = {
+        "username": username,
+        "expires": time.time() + SESSION_TTL,
+        "created": time.time(),
+    }
+    return token
+
+
+def get_session_user(token: str) -> "User | None":
+    """Return the User for a valid *token*, or None if missing/expired."""
+    if not token:
+        return None
+    session = _sessions.get(token)
+    if not session:
+        return None
+    if session["expires"] < time.time():
+        del _sessions[token]
+        return None
+    return get_user(session["username"])
+
+
+def delete_session(token: str) -> None:
+    """Invalidate *token* (logout)."""
+    _sessions.pop(token, None)
+
+
+def _purge_expired_sessions() -> None:
+    now = time.time()
+    expired = [t for t, s in list(_sessions.items()) if s["expires"] < now]
+    for t in expired:
+        del _sessions[t]
+
+
+def save_sessions() -> dict:
+    """Return a snapshot of non-expired sessions suitable for pickling."""
+    _purge_expired_sessions()
+    return dict(_sessions)
+
+
+def load_sessions(snapshot: dict) -> None:
+    """Restore sessions from a pickled snapshot, dropping any that have expired."""
+    global _sessions
+    now = time.time()
+    _sessions = {t: s for t, s in snapshot.items() if s.get("expires", 0) > now}
+    logger.debug("Restored %d session(s) from pickle", len(_sessions))

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "hbd"
-version = "5.0.10"
+version = "5.1.0"
 description = "Heartbeat monitoring system — client (hbc) and server (hbd)"
 readme = "README.md"
 requires-python = ">=3.11"

scripts/install.sh

@@ -1,6 +1,16 @@
 #!/bin/sh
 
-# install hbd/hbc from wheel and create symlinks for hbd and hbc in ~/bin
+# install the heartbeat tools. By default, this will install the hbc
+# client only. The server is installed when the arg 'server' is passed 
+# to the script. The script will install the heartbeat tools in a python 
+# virtual environment in ~/venvs/hbd. The hbd and hbc commands will be
+# installed from the wheel and symlinked to ~/bin/hbd and ~/bin/hbc,
+# respectively. If the virtual environment already exists, it will be
+# reused. The script will also remove any existing symlinks for hbd and hbc
+# in ~/bin before creating new ones.
+
+
+# hbd/hbc from wheel and create symlinks for hbd and hbc in ~/bin
 
 set -e
 if [ ! -d  ~/venvs/hbd ]; then