check-opencloud-security

Check the security level of your OpenCloud, instance from your own monitoring system.

This plugin ships its own built-in scanner and runs every check locally: it talks to the instance directly, reads the endpoints OpenCloud exposes without authentication, probes for the misconfigurations that actually occur in OpenCloud deployments, and rates the result on a 0-5 scale. The ratings follow the scale of the Nextcloud scan API, so existing thresholds, graphs and alert rules keep their meaning.

Important: The scanner is not exhaustive. Its rating does not mean an OpenCloud instance is completely secure or that no vulnerability, misconfiguration, or other issue has been overlooked.

Nothing about your instance is ever sent to a third party. The only optional outbound request is the update check, which asks GitHub for the newest OpenCloud release - and even that can be pinned, bundled or turned off entirely for an air-gapped setup.

Quick start

Install the plugin and run a check - one command each:

pipx install check-opencloud-security     # or: uv tool install / pip install
check-opencloud-security --host opencloud.example.com

A fresh OpenCloud created with opencloud init serves TLS on port 9200 with a self-signed certificate. Point the check at it and tell it not to hold the certificate against the instance:

check-opencloud-security --host opencloud.example.com:9200 --insecure

For a permanent setup (Icinga2, systemd timer, cron, Docker, ...) see Installation below.

Features

  • No API, no third party. Every check runs in the plugin process, against your instance. IP addresses, custom ports and internal hostnames all work, and there are no rate limits
  • OpenCloud-specific checks: unauthenticated Graph/WebDAV/OCS endpoints, exposed opencloud.yaml, proxy/server.key and boltdb files, reachable service debug ports (/metrics, /config, /debug/pprof), enabled basic auth, version disclosure and maintenance mode
  • TLS inspection: handshake, protocol version, certificate expiry and trust, plus an automatic HTTPS -> HTTP fallback that reports the downgrade instead of hiding it
  • Hardening derived from what the instance actually reports, not guessed from its version number: HSTS strength, CSP quality, public-link password and expiry enforcement, user-enumeration and password-policy settings
  • Update check against the OpenCloud release feed, with offline pinned and bundled modes
  • Configuration from a YAML file, environment variables or a secret provider (Docker/Kubernetes secrets, files, environment, commands)
  • Standard Nagios/Icinga exit codes (OK, WARNING, CRITICAL, UNKNOWN) and performance data (rating, vulnerability count, scan duration)
  • Configurable rating thresholds for WARNING and CRITICAL
  • Optional hardening and security-header checks (--check-hardening)
  • Optional webhook notification when a check turns critical
  • Automatic retry with exponential backoff on transient network errors
  • Web proxy support, debugging, multi-host runs
  • Installable with pipx/uv/pip - or as a ready-to-use Docker image

Prerequisites

  • Python 3.10 or newer - or Docker, if you prefer the containerised route.
  • requests and PyYAML, installed automatically by pipx/uv/pip.
  • Network access from the monitoring host to the OpenCloud instance. Unlike a hosted scanner, this plugin needs to reach the instance itself - which is exactly what makes it work for instances that are not on the internet.

Installation

Installing with pipx, uv or pip is the recommended route; Docker is available as an alternative if you don't want Python on the host.

Using pipx / uv / pip (recommended)

The package is published on PyPI and installs two commands onto your PATH: check-opencloud-security (the check itself) and check-opencloud-scanner (the same scanner as a one-shot JSON tool or a long-running service).

pipx - recommended for CLI tools, keeps the plugin in its own virtualenv:

pipx install check-opencloud-security

uv - same idea, faster:

uv tool install check-opencloud-security

pip - into the system or an existing virtualenv:

pip install check-opencloud-security

Every release ships a CycloneDX SBOM and a Sigstore provenance attestation; see Verifying what you downloaded if you would rather not take the artifact on trust.

To install the latest unreleased changes, point any of them at the repository instead: pipx install git+https://github.com/sowoi/check-opencloud-security.git (likewise uv tool install git+https://... and pip install git+https://...).

Updating

check-opencloud-security --upgrade-self

That works out how the plugin was installed and runs the right command for it. Use --upgrade-self=check to see what it would run without running it. A git checkout is refused - update that with git pull.

The commands it picks between, if you would rather run them yourself:

pipx upgrade check-opencloud-security          # pipx
pipx upgrade-all                               # ... or every pipx tool at once

uv tool upgrade check-opencloud-security       # uv
uv tool upgrade --all                          # ... or every uv tool at once

pip install --upgrade check-opencloud-security # pip

Check what you are running with check-opencloud-security --version, and see CHANGELOG.md for what changed. A git installation is updated by re-running the same install command with --force (pipx/uv) or --upgrade --force-reinstall (pip).

Keeping the package current matters more here than for a plugin that asks a hosted service: the OpenCloud release schedule and the newest known release ship inside the package (see End-of-life detection).

To remove the plugin again: pipx uninstall check-opencloud-security, uv tool uninstall check-opencloud-security or pip uninstall check-opencloud-security.

From a checkout (development or air-gapped install):

The project uses uv as its dependency manager; uv.lock pins every dependency, so an install is reproducible:

git clone https://github.com/sowoi/check-opencloud-security.git
cd check-opencloud-security

uv sync                                       # create .venv from uv.lock
uv run check-opencloud-security --host opencloud.example.com

Without uv, install the checkout with pip - the dependencies are declared in pyproject.toml, no separate requirements file is needed:

pip install .
# or, without installing, run the script in place:
pip install requests PyYAML
python3 check_opencloud_security.py --host opencloud.example.com

If some deployment tool of yours insists on a requirements.txt, generate one from the lock file instead of maintaining it by hand:

uv export --no-dev --no-emit-project --format requirements.txt -o requirements.txt

# without the hashes, if your tooling cannot handle them:
uv export --no-dev --no-emit-project --no-hashes --format requirements.txt -o requirements.txt

# including the development and test dependencies:
uv export --no-emit-project --format requirements.txt -o requirements-dev.txt

Such a file is a build artefact - do not commit it, it goes stale the moment uv.lock changes.

Shell completion

Completion is optional and off by default; it needs one extra dependency:

pipx install 'check-opencloud-security[completion]'
uv tool install 'check-opencloud-security[completion]'
# or, into an existing install:
pipx inject check-opencloud-security argcomplete
uv tool install --with argcomplete check-opencloud-security --force

Then register the two commands with your shell. For bash, in ~/.bashrc:

eval "$(register-python-argcomplete check-opencloud-security)"
eval "$(register-python-argcomplete check-opencloud-scanner)"

For zsh, the same two lines in ~/.zshrc, preceded once by autoload -U bashcompinit && bashcompinit. For fish, write the output to a completion file instead:

register-python-argcomplete --shell fish check-opencloud-security \
  > ~/.config/fish/completions/check-opencloud-security.fish

Completion knows the option names, the values of the options that take a fixed set (--webhook-on, --release-track, --update-source, --upgrade-self), and - the one that saves real typing - the hardening identifiers accepted by --ignore-hardening and their long, camel-cased names.

Without argcomplete installed, nothing is registered and the plugin behaves exactly as before; it is never a hard dependency of a monitoring plugin.

Docker

Use this if you would rather not install anything on the host. The image also ships the scan service (see Running the scanner as a service).

Build the image once from a local checkout of this repository. Everything Docker-related lives in docker/, and the build context is the repository root:

git clone https://github.com/sowoi/check-opencloud-security.git
cd check-opencloud-security
docker build -f docker/Dockerfile -t check-opencloud-security .

Run a check:

docker run --rm check-opencloud-security --host opencloud.example.com

Or configure it entirely through environment variables (handy since you don't need to edit the docker run command per host):

docker run --rm -e COS_HOST=opencloud.example.com check-opencloud-security

The image carries a HEALTHCHECK that verifies the image rather than any instance: that the package imports and that the release schedule and bundled advisory database parse. It needs no network, so it also passes on an air-gapped host. It is there for the long-running scan service; a one-shot check container exits before Docker gets round to running it. The service in docker/docker-compose.monitoring.yml overrides it with the HTTP /healthz probe, which is the more useful check once something is actually listening.

The check container needs no network ports, but it does need to reach the OpenCloud instance itself. If the instance is only reachable on the Docker host's own network, add --network host or the appropriate --add-host. It runs as an unprivileged nagios user and exits with the same Nagios-style codes (0/1/2/3) as the native script, so it can be dropped straight into any monitoring pipeline that already understands docker run as a check command (see Icinga2 / Nagios and Icinga Director below).

If you'd rather not build locally, push the built image to your own registry (e.g. docker tag check-opencloud-security registry.example.com/check-opencloud-security followed by docker push ...) and reference that image on your monitoring host(s) instead.

Icinga2 / Nagios

  • If you installed the package with pipx/uv/pip, locate the installed check-opencloud-security executable (e.g. which check-opencloud-security) and reference that path in PluginDir, or copy/symlink it into your plugin folder (usually /usr/lib/nagios/plugins/).
  • If you're running the script manually, put check_opencloud_security.py into your plugin folder instead.
  • Create a new custom command:
object CheckCommand "check_opencloud_security" {
    import "plugin-check-command"
    command = [ PluginDir + "/check-opencloud-security" ]

    arguments += {
        "--host" = {
            description = "OpenCloud hostname, IP or URL"
            required = true
            value = "$address$"
        }

        "--port" = {
            description = "Port the instance listens on, e.g. 9200 (optional)"
            value = "$opencloud_port$"
        }

        "--proxy" = {
            description = "HTTP/HTTPS proxy (optional)"
            required = false
        }

        "--insecure" = {
            description = "Do not verify the instance's TLS certificate (optional)"
            set_if = "$opencloud_insecure$"
        }

        "--no-debug-ports" = {
            description = "Skip probing the OpenCloud debug ports (optional)"
            set_if = "$opencloud_no_debug_ports$"
        }

        "--debug" = {
            description = "Enable debugging output (optional)"
            set_if = "$opencloud_debug$"
        }

        "--warning" = {
            description = "Rating (0-5) at or below which the check warns (optional)"
            value = "$opencloud_warning$"
        }

        "--critical" = {
            description = "Rating (0-5) at or below which the check is critical (optional)"
            value = "$opencloud_critical$"
        }

        "--check-hardening" = {
            description = "Also check hardening measures and security headers (optional)"
            set_if = "$opencloud_check_hardening$"
        }

        "--update-source" = {
            description = "Where the newest release is looked up: auto, feed, pinned, bundled, off"
            value = "$opencloud_update_source$"
        }
    }
}
  • Create a new Service object.
object Service "Service: OpenCloud Security Scan" {
   import               "generic-service"
   host_name =          "YOUR OPENCLOUD HOST"
   check_command =      "check_opencloud_security"
   check_interval = 24h
}

The scan only talks to your own instance, so there is no external rate limit to respect and a shorter interval than 24h is technically fine. A full scan does issue a few dozen requests plus the debug-port probes, though, so an hourly check is a sensible floor - and if the update check uses the GitHub feed, keep it at a few times a day or supply a token.

Using the Docker image instead

If you installed via Docker, point the CheckCommand at docker and let it run the container on demand instead of a local binary:

object CheckCommand "check_opencloud_security_docker" {
    import "plugin-check-command"
    command = [ "/usr/bin/docker" ]

    arguments += {
        "run" = {
            order = -5
            value = "run"
        }
        "--rm" = {
            order = -4
            value = "--rm"
        }
        "image" = {
            order = -3
            skip_key = true
            value = "check-opencloud-security"
        }
        "--host" = {
            description = "OpenCloud hostname, IP or URL"
            required = true
            value = "$address$"
        }
        "--port" = {
            description = "Port the instance listens on, e.g. 9200 (optional)"
            value = "$opencloud_port$"
        }
        "--proxy" = {
            description = "HTTP/HTTPS proxy (optional)"
            required = false
        }
        "--insecure" = {
            description = "Do not verify the instance's TLS certificate (optional)"
            set_if = "$opencloud_insecure$"
        }
        "--debug" = {
            description = "Enable debugging output (optional)"
            set_if = "$opencloud_debug$"
        }
        "--warning" = {
            description = "Rating (0-5) at or below which the check warns (optional)"
            value = "$opencloud_warning$"
        }
        "--critical" = {
            description = "Rating (0-5) at or below which the check is critical (optional)"
            value = "$opencloud_critical$"
        }
        "--check-hardening" = {
            description = "Also check hardening measures and security headers (optional)"
            set_if = "$opencloud_check_hardening$"
        }
    }
}

This assumes the check-opencloud-security image has already been built (or pulled) on the Icinga2 host, that the user running the Icinga2 daemon has permission to talk to the Docker socket, and that the container can reach the OpenCloud instance.

CLI Usage

  • check-opencloud-security -h will show you a manual.

Command

check-opencloud-security --host <Hostname> --check-hardening

Options:

Option Description Default Environment variable
-H, --host OpenCloud server address(es): hostname, IP or URL, optionally with a port. Accepts a comma-separated list to check multiple hosts in one run required COS_HOST
-P, --proxy Proxy server address None COS_PROXY
-d, --debug Explain the rating and every finding; verbose logging False COS_DEBUG
-w, --warning Rating (0-5) at or below which the check warns 3 (C) COS_WARNING
-c, --critical Rating (0-5) at or below which the check is critical 1 (E) COS_CRITICAL
--check-hardening Also report missing hardening measures and security headers False COS_CHECK_HARDENING
--timeout HTTP timeout in seconds per request 10 COS_TIMEOUT
--port Port the instance listens on (OpenCloud's own proxy uses 9200) from --host, else 443 COS_SCANNER_TARGET_PORT
--scheme https or http; https falls back to http automatically https COS_SCANNER_SCHEME
--insecure Do not verify the instance's TLS certificate False COS_INSECURE
--no-extra-checks Only check product, version and security headers False COS_NO_EXTRA_CHECKS
--no-debug-ports Skip probing the OpenCloud debug ports False COS_NO_DEBUG_PORTS
--concurrency Maximum parallel host workers; one is used per host up to this ceiling 5 COS_CONCURRENCY
--format One-shot output format: nagios or prometheus nagios COS_FORMAT
--prometheus-listen-port Serve native /metrics on this port until stopped disabled COS_PROMETHEUS_LISTEN_PORT
--prometheus-listen-addr Bind address for the native Prometheus exporter 0.0.0.0 COS_PROMETHEUS_LISTEN_ADDR
--scrape-interval Seconds to cache exporter scan results (0 scans on every scrape) 60 COS_SCRAPE_INTERVAL
--ignore-hardening Hardening measure or check to accept, repeatable, comma-separated and wildcard capable None COS_SCANNER_IGNORE_HARDENINGS
--release-track Release track this instance follows: rolling, production or lts inferred COS_SCANNER_RELEASE_TRACK
--update-source Where the newest release comes from: auto, feed, pinned, bundled, off auto COS_UPDATE_SOURCE
--release-feed URL of the release feed GitHub releases API of opencloud-eu/opencloud COS_RELEASES_FEED_URL
--release-token Token for the release feed (raises GitHub's rate limit) None COS_RELEASES_TOKEN
--latest-version Newest release, given explicitly; implies --update-source pinned None COS_RELEASES_LATEST_VERSION
--no-update-check Disable the update check (same as --update-source off) False COS_NO_UPDATE_CHECK
--update-warning Report WARNING when a newer release is available False COS_UPDATE_WARNING
--baseline File that remembers the findings of the last run, one entry per host None COS_BASELINE
--warn-on-new Only alert on findings that are new or worse than the baseline; needs --baseline False COS_WARN_ON_NEW
--diff-format Render baseline changes as text, markdown, or Slack Block Kit slack/json text COS_DIFF_FORMAT
--self-update-check Note when a newer version of the plugin is published on PyPI; never changes the exit code False COS_SELF_UPDATE_CHECK
--webhook-url Optional endpoint notified when the check reaches the configured state None (disabled) COS_WEBHOOK_URL
--webhook-on Lowest state that triggers the webhook (critical, warning, unknown, always) critical COS_WEBHOOK_ON
--webhook-header Extra header for the webhook request, repeatable None COS_WEBHOOK_HEADERS
--webhook-timeout HTTP timeout in seconds for the webhook call 10 COS_WEBHOOK_TIMEOUT
--allow-private-webhooks Permit webhooks to private, loopback, or link-local addresses False COS_ALLOW_PRIVATE_WEBHOOKS
--retries Retry attempts for transient network errors 2 COS_RETRIES
--backoff-factor Exponential backoff factor (seconds) between retries 0.5 COS_BACKOFF_FACTOR
--config Path to the configuration file (.json as JSON, else YAML) auto-discovered COS_CONFIG_FILE
--configure Ask for the settings interactively and save them, then exit — —
--upgrade-self [run|check] Upgrade the plugin with pipx, uv or pip, then exit; check prints the command instead of running it run when given without a value —
--check-only Only with --upgrade-self: another spelling of --upgrade-self check — —
-V, --version Show the installed version and exit — —
-h, --help Show help and exit — —

Settings that have no command-line flag of their own - the TLS expiry window, the debug-port list, the advisory sources - are configured through the configuration file or their COS_SCANNER_* environment variables.

Checking multiple hosts

--host (and COS_HOST) accepts a comma-separated list of hostnames, e.g.:

check-opencloud-security --host opencloud1.example.com,opencloud2.example.com

Hosts run concurrently: the plugin creates one worker per host, up to the default ceiling of five. A single-host check remains strictly single-threaded, with no host worker pool. Set --concurrency or COS_CONCURRENCY to lower or raise the ceiling (up to 32), for example --concurrency 2 for at most two hosts at a time. Each worker keeps its result and Nagios perfdata separate; the output starts with a one-line summary (e.g. Checked 2 host(s): overall CRITICAL (1 CRITICAL, 1 OK)), followed by one result block per host in the same order as the input. The plugin exits with the worst status found across all hosts, using the usual Nagios/Icinga priority: CRITICAL > WARNING > UNKNOWN > OK. A single host still produces the original, single-block output and exit code, so existing single-host setups are unaffected. Once the instances stop resembling each other, one configuration file per instance scales better - see Checking a fleet of instances.

Whitespace around each hostname is ignored, and empty entries (e.g. from a trailing comma) are dropped. Because there is no hosted API involved, each entry may be a hostname, an IPv4 address, a bracketed IPv6 address or a full URL, with or without a port: --host 10.0.0.5:9200,[2001:db8::1],https://cloud.example.com/.

Prometheus & Kubernetes integration

Use --format=prometheus to produce a one-shot Prometheus text payload:

check-opencloud-security --host opencloud.example.com --format=prometheus

For pull-based monitoring, run the built-in exporter. It serves /metrics, refreshing each configured target on the first scrape and then at the --scrape-interval (60 seconds by default). Set it to 0 only when every scrape should trigger a scan:

check-opencloud-security --host opencloud.example.com \
  --prometheus-listen-port 9102 --prometheus-listen-addr 0.0.0.0

The Docker image needs no extra package or sidecar:

docker run --rm -p 9102:9102 check-opencloud-security \
  --host opencloud.example.com --prometheus-listen-port 9102

In Kubernetes, run the same command in a Deployment, expose port 9102, and point a ServiceMonitor or scrape configuration at /metrics. The exporter publishes opencloud_security_rating_score, opencloud_security_vulnerabilities_total, opencloud_security_hardenings_missing_total, opencloud_security_failed_extra_checks_total, opencloud_security_support_days_remaining, opencloud_security_update_available, opencloud_security_scan_duration_seconds, and opencloud_security_scrape_success. The host label identifies the configured target; rating also carries domain, product, and version.

For Grafana, show opencloud_security_rating_score in a stat panel with thresholds at 3 (warning) and 1 (critical), graph opencloud_security_support_days_remaining, and alert when opencloud_security_scrape_success == 0. See the Prometheus and Grafana guide for alerting and legacy textfile/Pushgateway patterns.

Environment variables

Every option has a COS_-prefixed environment variable equivalent (see the table above). This is especially useful for Docker, systemd, and cron, where setting environment variables is often more convenient than editing a command line. An explicit command-line flag always takes precedence over its environment variable.

export COS_HOST=opencloud.example.com
export COS_PROXY=http://proxy.example.com:3128
check-opencloud-security

Boolean variables (COS_DEBUG, COS_CHECK_HARDENING, COS_INSECURE, ...) accept 1, true, yes, or on (case-insensitive) to enable the corresponding flag; any other value (including unset/empty) is treated as disabled.

The same values can also come from a YAML file or a secret provider - see Configuration file and secrets.

The built-in scanner

The plugin has one backend: the scanner in opencloud_local_scan/, which runs in the plugin process and works the verdict out itself.

That is deliberate. A hosted scanner can only see what is reachable from the internet, refuses IP addresses and internal hostnames, rate-limits its callers and learns about your instance in the process. Scanning locally has none of those constraints.

There is nothing to enable and no --scan-backend flag to pass. Everything below describes what the built-in scanner does and how to tune it.

What the scanner checks

Read from the instance itself:

  • product, productversion and edition from /status.php, plus maintenance and needsDbUpgrade
  • capabilities from /ocs/v1.php/cloud/capabilities (both endpoints are unauthenticated in OpenCloud)
  • the security headers Strict-Transport-Security, Content-Security-Policy, X-Content-Type-Options, X-Frame-Options, X-Permitted-Cross-Domain-Policies, X-Robots-Tag, X-XSS-Protection and Referrer-Policy, reported as setup.headers
  • hardenings derived from those headers and capabilities
  • known vulnerabilities from the advisory database and the resulting rating (0-5)

Plus the additional checks (extraChecks in the JSON, disable with --no-extra-checks):

Check Severity Purpose
httpsAvailable, tlsHandshake, tlsProtocol critical/high Instance only reachable over HTTP, broken TLS, or a protocol older than TLS 1.2
tlsCertificate, tlsTrusted high/medium Certificate expired, expiring within scanner.tls_min_days, or not trusted
header:<name> high - low One of the headers above missing or too weak
authentication:/remote.php/dav/files/, /graph/v1.0/users, /ocs/v1.php/cloud/user critical/high An endpoint that must demand authentication answered anyway
exposed:/opencloud.yaml, /proxy/server.key, /idm/opencloud.boltdb, /.env, /docker-compose.yml, /storage/users/, /.git/config critical/high Deployment internals published by a misconfigured reverse proxy
directoryListing critical A directory index served instead of the web frontend
debugEndpoint:/metrics, /config, /debug/pprof/ critical/high Debug handlers reachable on the public address
debugPort:<port> high A service debug port answering from the outside
basicAuthDisabled medium The proxy still offers HTTP basic authentication
identityProviderDetected low No OpenID Connect discovery document and no redirect from it, so who signs users in cannot be established
reverseProxyDetected low Nothing suggests a reverse proxy in front of the instance
versionDisclosure:Server, webfingerVersionDisclosure low Exact versions leaked to unauthenticated callers
maintenanceMode, databaseUpgrade medium/high Instance in maintenance mode or waiting for a database upgrade

A failed additional check caps the rating (critical -> D, high -> C, medium -> A, low -> A+); set scanner.extra_checks_rating: false to report them without touching the rating.

OpenCloud is a single Go binary that serves its web frontend from embedded assets, and its frontend is a single-page application: unknown paths return the app shell with HTTP 200 rather than a 404. A naive "does /opencloud.yaml return 200?" check would therefore flag every healthy instance. The scanner first probes a path that cannot exist, learns what the catch-all response looks like, and only reports an exposed path whose response actually differs from it.

Who signs users in

The scan also reads /.well-known/openid-configuration - the OpenID Connect discovery document, or the redirect the instance answers it with - to find out which identity provider issues its tokens. An issuer on a different host means an external provider such as Keycloak, Authentik or Authelia is in front of the instance, and the result document records it:

{"identityProvider": {"detected": true, "external": true,
                      "issuer": "https://id.example.com", "vendor": "Keycloak"}}

This is context, never a verdict: using the built-in provider fails nothing, and no check requires an external one. It only softens basicAuthDisabled, which is medium normally and low when the interactive login goes through an external provider.

Nothing is submitted to the instance to establish this. The discovery document and the Location header are read, and no login form is ever filled in - a scanner that tries credentials against somebody's instance is a scanner nobody should point at their server, and an identity provider is the worst place to start.

When no provider can be found at all, identityProviderDetected fails at severity low and --debug points at OpenCloud's own documentation - the usual cause is a reverse proxy that does not forward /.well-known/.

What is in front of the instance

reverseProxy records whether anything answers before OpenCloud does: a Server header naming Nginx, Caddy, Cloudflare or another proxy, or a header only a forwarder adds such as Via.

{"reverseProxy": {"detected": true, "vendor": "Nginx", "evidence": "Server: nginx"}}

reverseProxyDetected fails when nothing was found, and does so at severity low on purpose: Traefik and HAProxy announce nothing by default, and stripping the Server header is itself good practice, so a well-run deployment can look bare from outside. The finding is worth showing and is never worth a grade.

Office and calendar integrations

Two integrations are visible without logging in, and both are reported as observations rather than verdicts:

  • /app/list is unprotected by OpenCloud's own proxy policy and names the app providers actually registered with the app registry - Collabora, OnlyOffice and the like. The app_providers block in the capabilities document is hardcoded and says nothing, so it is not used.
  • /.well-known/caldav answers with a redirect or an authentication challenge only when something is wired to it, which is how a proxied Radicale shows up. A stock instance answers 404.
{"integrations": {"office": {"detected": true, "apps": ["Collabora"], "groupware": false},
                  "calendar": {"detected": true, "advertised": true}}}

Neither becomes a check and neither can move the rating.

What the scan deliberately does not answer

  • Audit logging. OpenCloud's audit service only consumes the internal event bus. It publishes no endpoint, and no unauthenticated document mentions it, so whether it is enabled cannot be established from outside at all. It is not checked, and a clean report says nothing about it.
  • Whether an integration is configured correctly. The scan reports that an app provider is registered, or that something answers the CalDAV path. WOPI secrets, share permissions and the other service's own configuration live behind a login and are not checked.
  • Anything requiring credentials. No login form is ever submitted, no password is ever tried, and no request is made with an Authorization header.

Reading the version correctly

/status.php reports three version fields, and two of them are traps:

{"version":"0.1.0.0","versionstring":"0.1.0","productversion":"7.4.0"}

version and versionstring are hardcoded constants OpenCloud sends to keep old sync clients happy - they are the same on every instance and say nothing about the release. The real release is productversion only. The scanner uses productversion, falls back to the capabilities endpoint, and reports legacyVersion: true in the result document when an instance offers nothing but the placeholder. Anything comparing versions from /status.php by hand (including other monitoring scripts you may already run) is almost certainly reading the wrong field.

TLS and self-signed certificates

OpenCloud's proxy terminates TLS itself on port 9200, and opencloud init generates a self-signed certificate for it. Many deployments then put a reverse proxy with a real certificate in front; many others do not.

The scanner handles both without needing to be told which one it is looking at:

  1. HTTPS with certificate verification. If that works, everything is fine.
  2. HTTPS without verification. The scan continues and reports tlsTrusted as a failed check - you still get the full result, plus the fact that the chain is not trusted.
  3. Plain HTTP, reported as httpsAvailable (critical).

--insecure (COS_INSECURE) skips step 1. The untrusted chain is still listed in the output; it just stops counting against the rating. Use it for an instance you know is self-signed, so that a genuinely broken certificate elsewhere still stands out.

Debug ports

Every OpenCloud service has a debug listener that serves /healthz, /readyz, /metrics, /config and /debug/pprof. /metrics includes opencloud_proxy_build_info (exact version), /config dumps the effective service configuration, and /debug/pprof allows anyone to trigger profiling.

These listeners bind to loopback by default, so a debug port that answers from your monitoring host is a genuine finding - usually a container that published the whole port range. The scanner probes the five most informative ones:

Port Service
9205 proxy
9141 frontend
9124 graph
9134 idp
9239 idm

Each probe is a single TCP connect with a three second timeout, so a firewalled host costs up to 15 seconds. Turn the probes off with --no-debug-ports, run them in parallel with --concurrency, or tune them:

scanner:
  check_debug_ports: true
  debug_ports: [9205, 9141]
  debug_port_timeout: 1

Speeding the scan up

A scan spends nearly all of its time waiting for the instance to answer: around twenty HTTP requests and five TCP connects, one after the other. scanner.concurrency runs those probes in parallel for a single-host scan; raising it shortens a run considerably, at the price of a burst of parallel requests against the instance, and is most noticeable when debug-port probing runs into a firewall that swallows the connections. --concurrency instead controls the outer host-worker ceiling described in Checking multiple hosts.

The setting changes only the timing, never the verdict: the result document lists the same findings in the same order whatever the value is. Values above 32 are clamped. It can also be set once for every host:

scanner:
  concurrency: 8

End-of-life detection

A version number on its own does not tell you whether an OpenCloud instance is still receiving security fixes, because OpenCloud maintains three kinds of releases at the same time:

Track Cadence Supported until Support
Rolling about every 3 weeks its successor is released community
Production about every 6 months the next production release professional
LTS a production line 2 years after the line opened professional

See the OpenCloud release lifecycle for the authoritative description.

Where the tracks stand today, straight from the bundled schedule:

Track Current release Line Line opened Supported until
Rolling 7.4.0 7.4 2026-08-03 the next rolling release
Production 7.2.3 7.2 2026-06-25 the next production release
LTS 4.0.8 4.0 2025-12-01 2027-12-01

Read from the OpenCloud release lifecycle on 2026-08-12.

The consequence for monitoring is that the same version can be perfectly current or long dead depending on the track it was published on. 7.2.3 is the current production release even though the rolling track is already at 7.4.0, while 7.3.0 - a higher version - stopped receiving fixes the day 7.4.0 appeared.

The plugin therefore works in release lines (MAJOR.MINOR), which is the unit OpenCloud maintains: 7.2.3 is a patch of the 7.2 line. A line can belong to more than one track - 7.2 shipped as a rolling release before it was promoted to production, and 4.0 is both the previous production line and the current LTS line - and it is judged by whichever track supports it longest.

The schedule ships in opencloud_local_scan/data/release_schedule.json and is scraped from the release dates in the OpenCloud admin documentation, the only source that states the release type; the GitHub release list cannot tell a rolling release from a production one. It is refreshed on every release and weekly by a scheduled workflow, and the same run rewrites the table above - so the versions quoted here are the ones the plugin actually judges against, not the ones that were current when this page was written. Everything else in this section, including the worked examples below, is written by hand and may name older releases to make a point.

A line that is out of support is rated F and reported as CRITICAL:

CRITICAL: The 7.3 rolling release line is end-of-life and has no security fixes. Upgrade to 7.4.0.
OpenCloud 7.3.0 on cloud.example.com, rating: F, last scanned: 2026-08-12 15:18:08.839323
Release lifecycle: 7.3 (rolling), out of support since 2026-08-03, upgrade to 7.4.0

A supported line reports how much time is left, which is what makes an LTS instance worth monitoring at all:

Release lifecycle: 4.0 (lts), supported until 2027-12-01 (476 days left)

The remaining window is also published as the support_days_left performance value, so a graph shows it shrinking - and going negative once the line is overdue.

scanner:
  use_release_schedule: true      # false disables the EOL check entirely
  # release_schedule: /etc/check-opencloud-security/schedule.json

Or via the environment: COS_SCANNER_USE_RELEASE_SCHEDULE, COS_SCANNER_RELEASE_SCHEDULE.

Two things are worth knowing about the bundled schedule:

  • LTS releases are only available with a subscription, so an LTS line is recognised from the documentation but its releases may never appear publicly. If your vendor has committed to a different window, point release_schedule at your own file rather than letting the bundled one decide.
  • A release newer than everything in the schedule is never rated F. The file ages between updates, and a fresh release must not trip the alarm.

Advisory database

Known vulnerabilities are matched against the version range [introduced, fixed) of a local advisory database. Sources are merged in this order and de-duplicated by id:

  1. the file bundled with the package,
  2. every file in scanner.vulnerability_db,
  3. the JSON feed in scanner.vulnerability_feed.

The native format ({"advisories": [{"id": ..., "introduced": ..., "fixed": ...}]}), the GitHub Advisory API format and OSV documents are all understood, so an air-gapped setup can mirror a feed to a file without conversion. A feed that is unreachable is logged and ignored - it never turns a healthy instance into UNKNOWN.

The bundled database is empty. At the time of writing no CVE or GHSA has been published for OpenCloud, so vulnerabilities: [] means "nothing in the database you configured matched", not "this version is known to be safe". The rating you get is driven by the configuration checks above. Point scanner.vulnerability_feed at OSV or your own advisory mirror to make that part of the check meaningful.

Running the scanner as a service

The package ships a second entry point, check-opencloud-scanner. It runs the very same scanner, either once or as a service:

# one-shot: print the full result document as JSON
check-opencloud-scanner scan opencloud.example.com

# as a service
check-opencloud-scanner serve --port 8080
Endpoint Behaviour
POST /api/queue (url=<host>) Scan the host, return {"uuid": ...}
GET /api/result/<uuid> Return the stored result
POST /api/requeue (url=<host>) Discard the cache and scan again
GET /api/scan?url=<host> Convenience: scan and return the document
GET /healthz Liveness probe

The plugin does not talk to this service - it has no remote backend and always scans in process. The service exists so that several consumers (a dashboard, a script, a second monitoring system) can share one cached result, and so that scans can run from a host closer to the instance than the monitoring server is. Results are cached per host for service.cache_ttl seconds, 15 minutes by default.

Protect it with a token whenever it is reachable by others - without service.token every endpoint is open to anyone who can connect, and the scanner will happily scan any host they name:

docker run -d --name opencloud-scanner -p 127.0.0.1:8080:8080 \
  -e COS_SERVICE_TOKEN="$(openssl rand -hex 32)" \
  --entrypoint check-opencloud-scanner \
  check-opencloud-security serve

curl -H "Authorization: Bearer <token>" \
  'http://127.0.0.1:8080/api/scan?url=opencloud.example.com'

A ready-made docker/docker-compose.monitoring.yml starts the scanner plus a check container, including a health check and Docker secrets:

# 1. create the secret files from the templates
cp secrets/scanner_token.example  secrets/scanner_token
cp secrets/releases_token.example secrets/releases_token

# 2. fill them with real values
openssl rand -hex 32 > secrets/scanner_token          # protects the service
printf '%s' '<github-token>' > secrets/releases_token
chmod 600 secrets/scanner_token secrets/releases_token

# 3. adjust COS_HOST in docker/docker-compose.monitoring.yml, then:
cd docker
docker compose -f docker-compose.monitoring.yml up -d scanner
docker compose -f docker-compose.monitoring.yml run --rm check

The plain docker compose up in that directory is the public web application instead - see the web application.

Everything in secrets/ except the *.example templates is git-ignored - see secrets/README.md.

Update check

There is no update endpoint on an OpenCloud instance, so "is this the newest release?" is answered by comparing the productversion the instance reports against the OpenCloud release feed on GitHub. --update-source selects where that number comes from:

Mode Behaviour
auto (default) Try the feed; on any failure fall back to the release bundled with the package
feed Only the feed. A failure is reported as unknown rather than silently ignored
pinned Use --latest-version. No network access
bundled Use the release recorded in the shipped data file. No network access
off Skip the update check entirely (same as --no-update-check) 
# ask GitHub, with a token to stay clear of the anonymous rate limit
check-opencloud-security --host opencloud.example.com \
  --release-token 'secret://releases_token'

# fully offline: compare against a version you control
check-opencloud-security --host opencloud.example.com --latest-version 7.4.0

The anonymous GitHub API allows sixty requests per hour and IP address, shared with everything else on that address. A token - a fine-grained one without any permission is enough - raises that considerably. In auto mode a rate-limited lookup is not an error: the check falls back to the bundled release, which is as new as the installed package.

The result is reported as an extra output line and as the update_available performance metric; with --update-warning a pending update turns an otherwise OK result into WARNING. A failing update check never aborts the security check.

The recommended release follows your track

A release feed only knows the newest release overall, and on OpenCloud that is always a rolling one. Recommending it to a production or LTS instance would quietly move it onto a track with a three-week support window - the opposite of what an operator on the production track signed up for.

The update check therefore uses the release schedule to pick a target on the instance's own track:

Installed Track Recommended Why
7.2.3 production nothing Current production release, even though rolling is at 7.4.0
7.2.0 production 7.2.3 The newest patch of the same line
7.3.0 rolling 7.4.0 On rolling, the newest release is the right one
4.0.0 LTS 4.0.8 Where the backports are

The newest release overall is still reported, as newestRelease in the JSON result and the webhook payload, so nothing is hidden - it is just not presented as the thing to install. If the feed reports a newer patch of the line you are already on, the feed wins, because it is fresher than the bundled schedule.

Declaring your release track

By default the release schedule works out which track a version belongs to and judges it as generously as the truth allows: 7.2.3 appears on both the rolling and the production track, so it is treated as a production release and is current.

That is the right answer when nobody has said otherwise, but it is not the right answer for everyone. If you deliberately follow the rolling track, then 7.2.3 went out of support the day 7.4.0 shipped, and you want to be told so. --release-track says which track you are on, and the version is then judged on that track alone:

check-opencloud-security --host opencloud.example.com --release-track rolling
Installed Declared Verdict
7.2.3 nothing Supported - current production release
7.2.3 production Supported - current production release
7.2.3 rolling End of life - superseded by 7.4.0, upgrade to 7.4.0
7.4.0 production End of life - 7.4.0 is a rolling release and was never published on the production track
4.0.8 lts Supported until the two-year window closes

Two consequences are worth knowing about in advance:

  • A newer version can be less supported than an older one. 7.4.0 is newer than 7.2.3, but on the production track it does not exist, while 7.2.3 is current. This is not a bug in the check; it is what the tracks mean.
  • The check never recommends a downgrade. If your declared track has no release you could move up to, the update recommendation stays empty and the reason explains the situation instead. Moving from 7.4.0 back to 7.2.3 is a decision for a human, not for a monitoring plugin.

The declared track also steers the update recommendation described in the section above, and the output marks it as declared so it can be told apart from an inferred one:

Release lifecycle: 7.2 (rolling track declared), out of support since 2026-07-14, upgrade to 7.4.0

An unknown value is ignored rather than treated as an error, so a typo in a config file degrades to the default behaviour instead of taking the check down.

Configuration file and secrets

All settings can live in a file instead of the command line, and the quickest way to write one is to let the plugin ask:

check-opencloud-security --configure

The wizard asks for the one required setting - the host - explains what it is for, and shows an example. Everything else has a working default, so the optional settings are offered group by group and only asked for if you say yes. The result is written as JSON with mode 0600, and found automatically from then on:

check-opencloud-security          # no arguments needed any more

Use --config to say where it should go, e.g. --configure --config /etc/check-opencloud-security/.env.json. An existing file is shown and confirmed before it is replaced. The equivalent for the scanner on its own is check-opencloud-scanner configure.

The file is read from --config, COS_CONFIG_FILE, ./.env.json, ./check-opencloud-security.yml, ~/.config/check-opencloud-security/.env.json or /etc/check-opencloud-security/ (first match wins). A .json suffix is read as JSON, anything else as YAML - the two are interchangeable. See config/check-opencloud-security.example.yml for a fully commented example.

host: opencloud.example.com
check_hardening: true

scanner:
  verify_tls: false        # self-signed instance
  target_port: 9200
  tls_min_days: 21
  check_debug_ports: true

releases:
  mode: auto
  token: secret://releases_token

Nested keys map one to one onto the environment variables: scanner.target_port is COS_SCANNER_TARGET_PORT, releases.token is COS_RELEASES_TOKEN, scanner.tls_min_days is COS_SCANNER_TLS_MIN_DAYS. Precedence is command line > environment variable > configuration file > default.

Secrets never have to be written into the file or the process environment. Any value may be a reference:

Reference Resolves to
secret://name <secrets.dir>/name, i.e. /run/secrets/name for Docker and Kubernetes secrets
file:///path/to/file The contents of that file
env://VARIABLE The value of that environment variable
exec://command --arg The stdout of that command (requires secrets.allow_exec: true)

Alternatively append _file to any key or variable: COS_RELEASES_TOKEN_FILE=/run/secrets/token or token_file: /run/secrets/token. Trailing newlines are stripped, so echo secret > file works as expected.

secret://name looks below secrets.dir (COS_SECRETS_DIR), which defaults to /run/secrets - exactly where Docker and Kubernetes mount their secrets. Outside a container, point it at your own directory:

mkdir -p /etc/check-opencloud-security/secrets
printf '%s' '<github-token>' > /etc/check-opencloud-security/secrets/releases_token
chmod 600 /etc/check-opencloud-security/secrets/*

export COS_SECRETS_DIR=/etc/check-opencloud-security/secrets
check-opencloud-security --host opencloud.example.com \
  --release-token 'secret://releases_token'

The repository ships templates for both files in secrets/; copy them and replace the placeholder values.

Rating thresholds

The scanner grades an instance from A+ (best) down to F. The plugin maps that grade to a numeric rating and compares it against two inclusive thresholds:

Rating 5 4 3 2 1 0
Grade A+ A C D E F
  • -c, --critical / COS_CRITICAL (default 1, i.e. E) - a rating at or below this value is CRITICAL.
  • -w, --warning / COS_WARNING (default 3, i.e. C) - a rating at or below this value is WARNING.

Two rules always apply on top of the thresholds:

  • Known vulnerabilities raise the state to at least WARNING, even when the overall rating still looks acceptable. The reported identifiers are listed in the output.
  • An end-of-life version is always CRITICAL, because it receives no security fixes at all.

A single critical finding does not page by default. The worst finding caps the rating rather than setting it: critical caps at 2 (D), which the default --critical 1 still reports as WARNING. That is deliberate - it keeps one exposed path from being indistinguishable from an end-of-life instance. If a critical finding should wake somebody up, run with --critical 2.

A rating outside the documented 0-5 range yields UNKNOWN. --critical must not be higher than --warning, and both must be within 0-5; otherwise the plugin refuses to run.

# Only alert once the instance is actually end-of-life
check-opencloud-security --host opencloud.example.com --warning 1 --critical 0

# Page on any critical finding
check-opencloud-security --host opencloud.example.com --warning 4 --critical 2

Hardening checks

Besides the pass/fail checks above, the scanner reports which hardening measures the instance has in place. With --check-hardening / COS_CHECK_HARDENING these are evaluated as well.

The names are terse because they end up in alert text, so here is what each one means and what to change. Every setting below is an OpenCloud environment variable; run the plugin with --debug to get the same explanation printed next to the finding.

Hardening What a failure means Setting to change
basicAuthDisabled The instance offers HTTP Basic auth, so credentials can be replayed on every request and single sign-on (with any second factor) is bypassed. Often deliberate: CalDAV, CardDAV and WebDAV clients cannot speak OpenID Connect, which is why this is rated medium, and low when an external identity provider handles the interactive login. PROXY_ENABLE_BASIC_AUTH=false if nothing needs it; otherwise keep it and hand those clients app tokens rather than account passwords.
cspWithoutUnsafeInline The Content-Security-Policy contains 'unsafe-inline', so injected markup may execute. This is OpenCloud's shipped default - see the note below. PROXY_CSP_CONFIG_FILE_LOCATION pointing at your own csp.yaml (or PROXY_CSP_CONFIG_FILE_OVERRIDE_LOCATION to replace the default outright).
publicLinkPasswordEnforced Public links may be created without a password, so the URL alone grants access. OpenCloud enforces a password on read-only links but not on writable ones. OC_SHARING_PUBLIC_SHARE_MUST_HAVE_PASSWORD=true and OC_SHARING_PUBLIC_WRITEABLE_SHARE_MUST_HAVE_PASSWORD=true.
passwordPolicyEnforced Public link passwords may be shorter than 8 characters. (This policy covers link passwords, not account passwords - those belong to your identity provider.) OC_PASSWORD_POLICY_MIN_CHARACTERS (default 8), plus the MIN_LOWERCASE/MIN_UPPERCASE/MIN_DIGITS/MIN_SPECIAL_CHARACTERS companions.
hstsLongMaxAge Strict-Transport-Security carries a max-age below a year. None in OpenCloud - its proxy sends ten years, so a short value comes from a reverse proxy in front of it.
hstsPreload The same header has no preload directive, so the very first request to the host is unprotected. None in OpenCloud - again a reverse proxy rewriting the header. Only add preload once every subdomain is HTTPS-only.
publicLinkExpirationEnforced Nothing about your instance: OpenCloud hardcodes this capability to false. Never alerted on - see below. None exists.
userEnumerationRestricted Account search is not limited to shared groups. OpenCloud hardcodes the restricted state, so this passes everywhere. None exists.

Two further entries can show up in the "Missing hardening" line: httpsEnforced when the instance does not enforce HTTPS, and the name of any security header from setup.headers that is absent or too weak (e.g. Strict-Transport-Security). --debug explains those too.

Anything reported as missing is listed in the output and exported as the hardenings_missing performance metric. A result that would otherwise be OK is raised to WARNING; an existing WARNING/CRITICAL is never downgraded.

check-opencloud-security --host opencloud.example.com --check-hardening

Measures that are not settings

Two of the rows above cannot be influenced by anyone:

  • publicLinkExpirationEnforced is reported as false by every OpenCloud instance. The capability is a hardcoded constant in the frontend service, not a configuration value, so there is no variable to set and no version that passes.
  • userEnumerationRestricted is the same story with the opposite sign: hardcoded to the restricted state, so it always passes.

They are still recorded in the result document, because the observation is real, but they are left out of the "Missing hardening" line, out of the hardenings_missing metric and out of the webhook. A warning nobody can ever clear is noise, and noise is how genuine findings get ignored. --debug still lists them, with the explanation.

cspWithoutUnsafeInline is a milder version of the same problem: OpenCloud's default CSP contains 'unsafe-inline', so it fails on a stock instance. That one is changeable, so it is reported rather than excused - but be aware that the web interface currently relies on inline scripts and styles, so a strict policy is likely to break the UI and any connected office or IDP service. Test before rolling it out.

The capability-derived rows only appear when the instance actually reports the corresponding capability, so an older release does not accumulate phantom findings.

Accepting a finding you are not going to fix

Some findings are real but not actionable in your environment: a CSP you cannot tighten without breaking the web UI, an HSTS header your reverse proxy owns, or basic auth you genuinely need for a migration tool. Left alone they keep the rating down and the check yellow, and a check that is permanently yellow is a check nobody reads.

--ignore-hardening accepts a finding by name. The rating is recalculated without it, so accepting a finding really does change the grade:

check-opencloud-security --host opencloud.example.com --check-hardening \
    --ignore-hardening cspWithoutUnsafeInline \
    --ignore-hardening basicAuthDisabled

The option is repeatable, also takes a comma-separated list, and understands shell-style wildcards for the identifiers that carry a path or a port:

--ignore-hardening 'debugPort:*,exposed:/status.php'

It matches hardening measures, security header names, httpsEnforced and the ids of the additional checks - one option for all of them, because basicAuthDisabled is both a hardening measure and an additional check, and accepting it in one place but not the other would be surprising.

A waived finding:

  • no longer lowers the rating,
  • no longer appears in Missing hardening: or Additional checks failed,
  • no longer counts towards the hardenings_missing and extra_checks_failed metrics,
  • is left out of the webhook payload,
  • but stays in the JSON result document, flagged with "ignored": true, and is listed in the plugin output as Ignored by configuration (n): ....

That last point is deliberate. A waiver suppresses an alert, not the evidence: the scan still records what it saw, --debug still explains it, and anyone reading the output can see exactly what is being skipped.

Two things a waiver will not do:

  • It cannot waive something that passes. A waiver is only applied to a finding that actually failed, so it cannot quietly turn into a blind spot the day the measure regresses.
  • It cannot waive an end-of-life release. Running a version that receives no security fixes overrides every other signal, including --ignore-hardening '*'.

Waivers are a good fit for a config file, where they can carry a comment explaining why each one is there:

scanner:
  release_track: production
  ignore_hardenings:
    - cspWithoutUnsafeInline   # default csp.yaml, tightening it breaks the web UI
    - hstsPreload              # the reverse proxy sets its own HSTS header

Explaining a rating

A rating on its own is a verdict without an argument. -d / --debug (or COS_DEBUG=1) adds the reasoning to the output: where the rating started, what pulled it down, and what every identifier in the report means.

check-opencloud-security --host opencloud.example.com --check-hardening --debug

--- Why this rating ---
Starting point: 5/5 - the installed release is current and no advisory matches this version
Failed check basicAuthDisabled [medium] caps the rating at 4/5 - WWW-Authenticate: Basic realm="..."
Final rating: 4/5 (B). WARNING at or below C, CRITICAL at or below E.

--- Missing hardening measures ---
basicAuthDisabled: HTTP Basic authentication is enabled
    The instance answers with a 'WWW-Authenticate: Basic' challenge, so usernames
    and passwords can be replayed on every request without going through the
    identity provider ... It is often deliberate: CalDAV, CardDAV and WebDAV
    clients cannot speak OpenID Connect and have nothing else to authenticate
    with, which is why this counts as a medium finding rather than a serious one.
    Setting: PROXY_ENABLE_BASIC_AUTH
    Fix: Set PROXY_ENABLE_BASIC_AUTH=false (the default) if nothing needs it. If
    calendar, contact or WebDAV clients do, keep it on and give them app tokens
    rather than account passwords.
    Docs: https://docs.opencloud.eu/docs/dev/server/services/proxy/environment-variables
--- end of explanation ---

The starting point is what the version and the advisory database alone would give: 5 up to date, 4 a patch update pending, 3 a whole release line behind, 2 known vulnerabilities, 1 critical or high ones, 0 end of life. Failed additional checks then cap it by severity - critical to 2, high to 3, medium to 4, low to 5. A check that failed but did not decide the outcome is still listed, marked as such, so nothing looks quietly dropped.

Without --debug the output stays the size a monitoring system wants. The same breakdown is always present in the scan result as ratingExplanation, so it can be read without rerunning the check:

python -m opencloud_local_scan.cli scan opencloud.example.com | jq .ratingExplanation

Note that --debug also switches logging to DEBUG, so HTTP-level detail goes to stderr while the explanation goes to stdout with the rest of the plugin output.

Webhook notifications

The plugin can post a JSON notification to an HTTP(S) endpoint when a check reaches a critical level. The feature is optional and disabled by default - it activates only once --webhook-url (or COS_WEBHOOK_URL) is set.

check-opencloud-security --host opencloud.example.com \
  --webhook-url https://hooks.example.com/opencloud
  • --webhook-on / COS_WEBHOOK_ON (default critical) selects the lowest state that triggers a notification. Each level includes the more severe ones: critical, warning (WARNING + CRITICAL), unknown (UNKNOWN + WARNING + CRITICAL) and always.
  • --webhook-header / COS_WEBHOOK_HEADERS adds request headers, e.g. for authentication. Repeat the flag, or separate entries with ; in the environment variable: COS_WEBHOOK_HEADERS="X-Auth-Token: abc; X-Env: prod".
  • --webhook-timeout / COS_WEBHOOK_TIMEOUT (default 10) limits the webhook call; it is independent of the scan --timeout.
  • Webhook destinations that resolve to private, loopback, or link-local addresses are blocked to prevent server-side request forgery. Set --allow-private-webhooks or COS_ALLOW_PRIVATE_WEBHOOKS=true only for an intentional internal receiver.

Delivery reuses --retries / --backoff-factor. A failing webhook never changes the check result - the plugin appends Webhook delivery failed to its output and still exits with the state it measured, so a broken notification channel cannot hide (or fake) a vulnerable instance.

When several hosts are checked in one run, each host that reaches the configured state produces its own notification. Scans that fail outright (unreachable host, broken TLS) notify as well when --webhook-on is set to unknown or always.

Example payload:

{
  "plugin": "check-opencloud-security",
  "plugin_version": "1.0.0",
  "timestamp": "2026-08-07T10:12:33.123456+00:00",
  "host": "opencloud.example.com",
  "status": "CRITICAL",
  "exit_code": 2,
  "message": "CRITICAL: The 7.3 rolling release line is end-of-life and has no security fixes. Upgrade to 7.4.0.",
  "rating": 0,
  "rating_label": "F",
  "product": "OpenCloud",
  "product_version": "7.3.0",
  "domain": "opencloud.example.com",
  "scanned_at": "2026-08-12 15:24:13.978540",
  "eol": true,
  "release_type": "rolling",
  "lifecycle": {
    "line": "7.3",
    "releaseType": "rolling",
    "state": "endOfLife",
    "released": "2026-07-14",
    "endOfLife": "2026-08-03",
    "daysRemaining": -9,
    "latestOnLine": null,
    "upgradeTo": "7.4.0",
    "reason": "rolling release, unsupported since 2026-08-03"
  },
  "vulnerability_count": 0,
  "vulnerabilities": [],
  "missing_hardenings": [],
  "failed_extra_checks": ["exposed:/opencloud.yaml"],
  "scan_backend": "local",
  "scan_uuid": "6a1d1bd0-...",
  "update": {"available": true, "version": "7.3.0", "availableVersion": "7.4.0", "releasedAt": "2026-08-03", "source": "feed", "error": null, "track": "rolling", "newestRelease": null},
  "duration_seconds": 1.234
}

scan_backend is always "local" - it records how the result was obtained, so a receiver that also handles payloads from scanners with a remote backend can tell them apart without special-casing the plugin name.

Notifications sent for a failed scan carry only the common fields (plugin, plugin_version, timestamp, host, status, exit_code, message).

Note: treat the webhook as a supplement to your monitoring system, not a replacement. It is fire-and-forget and is not retried beyond the configured retry budget.

Receivers that want their own JSON - Slack, Discord, ntfy, Alertmanager - need a few lines of translation in between. Webhook recipes has one for each.

Uptime Kuma

Uptime Kuma has no plugin system, but its Push monitor is a URL that expects to be called regularly - which is exactly what the webhook does. The check becomes a monitor in three steps.

1. Create the monitor. In Uptime Kuma choose Add New Monitor, monitor type Push, and name it after the instance. Uptime Kuma shows a Push URL of the form https://kuma.example.com/api/push/<token>. Set Heartbeat Interval a little longer than the interval you will run the check at - 300 seconds for a check every four minutes - so a single slow scan does not already count as down.

2. Point the webhook at it, and set --webhook-on always so that a healthy result also reports in. Without it Uptime Kuma would only ever hear from the check when something is wrong, and treat silence as down:

check-opencloud-security --host opencloud.example.com \
  --webhook-url 'https://kuma.example.com/api/push/<token>' \
  --webhook-on always

Or in the configuration file, so the token is not in the process list:

host: opencloud.example.com
webhook:
  url: secret://kuma_push_url
  on: always

3. Run it on a schedule - see systemd timer or cron. Uptime Kuma goes red when no push arrives within the heartbeat interval, so a plugin that cannot run at all shows up as well.

Uptime Kuma stores the JSON body it receives and shows it on the monitor, so the rating, the OpenCloud version and the reason for the state are visible in the heartbeat detail. To surface the state in the message column too, use the push URL's own query parameters alongside the webhook:

Field in the payload What it tells you in Uptime Kuma
status / exit_code OK, WARNING, CRITICAL or UNKNOWN
message The one-line reason, ready to paste into an alert
rating, rating_label The 0-5 score and its A-F label
product_version, eol Which OpenCloud release, and whether it still gets fixes
update.availableVersion What to upgrade to
duration_seconds How long the scan took

If you would rather have Uptime Kuma go down on any problem, keep --webhook-on always and add a keyword check on the JSON, or run a second Push monitor fed by a wrapper that only pushes when the plugin exits 0:

check-opencloud-security --host opencloud.example.com \
  && curl -fsS 'https://kuma.example.com/api/push/<token>?status=up' \
  || curl -fsS 'https://kuma.example.com/api/push/<token>?status=down&msg=opencloud'

The webhook route is the better one of the two: it pushes on every outcome and carries the detail, while the wrapper only carries up or down.

Reporting only what changed

A check that runs every five minutes reports the same finding until someone fixes it, which is how people learn to acknowledge an alert and stop reading it. --baseline writes the findings of each run to a file and compares the next run against it:

check-opencloud-security -H opencloud.example.com \
    --check-hardening \
    --baseline /var/lib/check_opencloud/baseline.json

On its own this only adds a line to the output (Baseline: ...). Add --warn-on-new to act on it:

check-opencloud-security -H opencloud.example.com \
    --check-hardening \
    --baseline /var/lib/check_opencloud/baseline.json \
    --warn-on-new

The check then reports OK while the picture is unchanged, and its normal status as soon as anything is new or worse. The full state is still printed either way - only the alert is suppressed, never the evidence:

OK: nothing new since the last run (WARNING state unchanged).
OpenCloud 7.2.3 on opencloud.example.com, rating: C, last scanned: 2026-01-14
Missing hardening: cspWithoutUnsafeInline (run with --debug for what each means and how to fix it)
Baseline: No new findings since 2026-01-14T09:00:00+00:00 (1 known issue(s) unchanged)
Suppressed by --warn-on-new: this run would otherwise be WARNING (WARNING: 1 hardening measure(s) missing, but no known vulnerabilities.)

Every comparison also lists added and resolved CVEs, hardening and additional check changes, rating/EOL/support-horizon changes, and installed or target version shifts. text is the default for logs. For a GitHub Actions step summary or pull-request comment, select Markdown:

check-opencloud-security -H opencloud.example.com \
  --baseline /var/lib/check_opencloud/baseline.json \
  --diff-format markdown >> "$GITHUB_STEP_SUMMARY"

Use --diff-format slack (or json) for Slack Block Kit JSON. When a webhook is configured, every baseline comparison is included as baseline_diff; Slack format additionally puts the blocks and color banner at the top level for incoming webhooks:

check-opencloud-security -H opencloud.example.com \
  --baseline /var/lib/check_opencloud/baseline.json \
  --diff-format slack --webhook-url 'https://hooks.slack.com/services/<token>' \
  --webhook-on always

What counts as a regression, and therefore still alerts:

  • a finding that was not there last time - a new advisory, a hardening measure that has regressed, an additional check that started failing, a newly available update;
  • a rating lower than the one recorded;
  • a release past its end of life, always. It receives no security fixes, so it gets worse every day it stays in production and can never be grandfathered in by a baseline.

Points worth knowing:

  • The first run has nothing to compare against, so it reports normally and becomes the baseline. Starting to use the flag never hides anything.
  • One file holds one entry per host, so a comma-separated --host list can share it.
  • Findings that are waived with --ignore-hardening, and measures OpenCloud hardcodes, are left out - exactly as they are left out of the alert line.
  • --warn-on-new without --baseline is rejected: with nowhere to remember the last run it would report "nothing new" forever.
  • A baseline that cannot be written is reported as a line of output and nothing more. Bookkeeping never decides the verdict on an instance.
  • The file is written atomically with owner-only permissions. Put it somewhere the monitoring user owns, e.g. /var/lib/check_opencloud/.

Is the plugin itself up to date?

The plugin reports on OpenCloud's updates but says nothing about its own age, and a check running an old advisory database is a blind spot. --self-update-check asks PyPI once a day and appends a note:

Plugin update available: check-opencloud-security 1.2.0 is published, this is 1.1.0 (upgrade with --upgrade-self)

It is off by default, cached under ${XDG_CACHE_HOME:-~/.cache}/check-opencloud-security/, and never changes the exit code: whether PyPI answered says nothing about the health of the instance being monitored. Every failure - no network, a proxy in the way, PyPI down - is silent.

Upgrade with --upgrade-self, or look at what it would do first with --upgrade-self check (--upgrade-self --check-only is the same thing).

Retries and backoff

Transient network errors (timeouts, connection resets, 5xx responses from the instance) are retried automatically with exponential backoff before the check gives up and reports UNKNOWN.

  • --retries / COS_RETRIES (default 2) - number of retry attempts after the initial try (so the default performs up to 3 attempts total).
  • --backoff-factor / COS_BACKOFF_FACTOR (default 0.5) - base delay in seconds; the wait before each retry doubles (backoff_factor * 2^attempt), e.g. 0.5s, 1s, 2s, ...
  • --timeout / COS_TIMEOUT (default 10) - how long a single request may take before it counts as a failure. Raise it on slow links or when scanning through a proxy.

Set --retries 0 to disable retries entirely and fail fast. A retry re-runs the whole scan, so a high retry count on an unreachable host makes the check take noticeably longer than the timeout alone suggests.

Performance data

Output includes standard Nagios/Icinga performance data after a | character, so Icinga2/Grafana/etc. can graph results over time:

rating=5;@0:3;@0:1;0;5 vulnerabilities=0;;;0; time=1.234s;;;0;

The rating metric carries the configured WARNING and CRITICAL thresholds in Nagios range syntax (@0:3 means "warn inside 0-3"), so Icinga2 draws them on the graph without extra configuration.

Metric Meaning
rating Numeric scan rating, 0-5 (5=A+ ... 0=F), U if unknown
vulnerabilities Number of known vulnerabilities reported for the scanned version
time Time spent on the scan, in seconds
hardenings_missing Missing hardening measures (only with --check-hardening)
extra_checks_failed Number of failed additional checks
update_available 1 when a newer OpenCloud release exists
support_days_left Days until the release line loses support (negative when overdue)

Outside Icinga2, the same numbers reach Prometheus through the node_exporter textfile collector or a Pushgateway - see Prometheus and Grafana.

Caching

The plugin holds no cache: every run scans the instance afresh, so there is nothing to invalidate and no flag to force a fresh scan.

The one place caching does happen is the optional scan service, which reuses a result for service.cache_ttl seconds. POST /api/requeue discards it and scans again.

Example output

A healthy instance:

$ check-opencloud-security -H opencloud.example.com
OK: Server is up to date. No known vulnerabilities.
OpenCloud 7.4.0 on opencloud.example.com, rating: A+, last scanned: 2026-05-29 08:50:58.000000
Additional checks: all passed | rating=5;@0:3;@0:1;0;5 vulnerabilities=0;;;0; time=0.731s;;;0; extra_checks_failed=0;;;0;

A major release that no longer receives fixes - always CRITICAL, regardless of the thresholds:

$ check-opencloud-security -H opencloud.example.com
CRITICAL: The 7.3 rolling release line is end-of-life and has no security fixes. Upgrade to 7.4.0.
OpenCloud 1.0.0 on opencloud.example.com, rating: F, last scanned: 2026-05-30 07:48:58.000000
Additional checks: all passed | rating=0;@0:3;@0:1;0;5 vulnerabilities=0;;;0; time=0.842s;;;0; extra_checks_failed=0;;;0;

A single critical finding caps the rating at D, which the default thresholds report as WARNING - see Rating thresholds:

$ check-opencloud-security -H opencloud.example.com
WARNING: Rating D is at or below the warning threshold C, but no known vulnerabilities.
OpenCloud 7.4.0 on opencloud.example.com, rating: D, last scanned: 2026-05-29 08:51:33.000000
Additional checks failed (1): exposed:/opencloud.yaml | rating=2;@0:3;@0:1;0;5 vulnerabilities=0;;;0; time=0.860s;;;0; extra_checks_failed=1;;;0;

With --check-hardening on a production instance whose proxy still offers HTTP Basic authentication:

$ check-opencloud-security -H opencloud.example.com --check-hardening
WARNING: 3 hardening measure(s) missing, but no known vulnerabilities.
OpenCloud 7.2.3 on opencloud.example.com, rating: B, last scanned: 2026-08-12 15:58:04.138671
Release lifecycle: 7.2 (production), current release
Missing hardening: basicAuthDisabled, cspWithoutUnsafeInline, publicLinkPasswordEnforced (run with --debug for what each means and how to fix it)
Additional checks failed (1): basicAuthDisabled
Update check (feed, installed 7.2.3): up to date | rating=4;@0:3;@0:1;0;5 vulnerabilities=0;;;0; time=1.835s;;;0; hardenings_missing=3;;;0; extra_checks_failed=1;;;0; update_available=0;;;0;1

The rating dropped to B because basicAuthDisabled is also an additional check, and a failed medium check caps the rating at 4. A hardening measure that is only a hardening measure raises the state to WARNING without lowering the grade. Add --debug to have the check spell that out, along with what each identifier means - see Explaining a rating.

Deployment guides

The longer deployment walk-throughs live in docs/, so that this file stays the reference for the options themselves.

Guide What it covers
Icinga Director The CheckCommand, data fields, service template and apply rule, through the web UI
Automated deployment with Ansible The native and Docker roles, their variables, and deploying the Icinga2 objects unattended
Scheduling without Icinga2 / Nagios systemd timer and cron, using the files in contrib/
Kubernetes A CronJob for scheduled scans, and the scan service as a Deployment with probes
Running the check from CI GitHub Actions and GitLab CI, and gating a pipeline on the result document
The public scan service The web application: FastAPI, an ARQ worker and Redis, with queueing, SSRF protection and rate limits
Checking a fleet of instances One configuration file per instance, and keeping waivers honest
Prometheus and Grafana Textfile collector, Pushgateway, alerting rules and what to graph
Webhook recipes Adapters for Slack, Discord, ntfy and Alertmanager
Troubleshooting The errors people actually hit, and the exit code reference

Something not working? Start with Troubleshooting, which also carries the exit code reference.

Examples

A collection of complete, copy-and-paste invocations for the situations that come up most often. Every example uses opencloud.example.com as the host.

Longer, platform-specific examples live in docs/: Kubernetes, CI pipelines, Prometheus and Grafana, webhook adapters and fleets of instances.

The basics

# The smallest useful check
check-opencloud-security --host opencloud.example.com

# Include hardening measures and security headers in the report
check-opencloud-security --host opencloud.example.com --check-hardening

# Explain the verdict: where the rating started, what pulled it down,
# and what every identifier in the output means
check-opencloud-security --host opencloud.example.com --check-hardening --debug

# Several instances in one run; the worst state is reported
check-opencloud-security --host cloud-a.example.com --host cloud-b.example.com

Release track examples

# You follow the production track: only production releases and their
# patches count, and you are never sent to a rolling release
check-opencloud-security --host opencloud.example.com --release-track production

# You follow the rolling track: a release is out of support as soon as the
# next one ships, and you want to know about it the same day
check-opencloud-security --host opencloud.example.com --release-track rolling

# An LTS instance, where two years of backports are the whole point
check-opencloud-security --host opencloud.example.com --release-track lts

# Warn as soon as an update is available on your track, rather than only
# when support has actually run out
check-opencloud-security --host opencloud.example.com \
    --release-track production --update-warning

Remember that a newer version is not automatically a better supported one: declaring production on an instance running a rolling release will report end of life, because that release was never published on the production track.

Accepting findings you are not going to fix

# The reverse proxy owns the HSTS header, and the default CSP cannot be
# tightened without breaking the web UI
check-opencloud-security --host opencloud.example.com --check-hardening \
    --ignore-hardening cspWithoutUnsafeInline \
    --ignore-hardening hstsPreload

# The same thing as a single comma-separated value, which is what you want
# in an Icinga command definition or an environment variable
check-opencloud-security --host opencloud.example.com --check-hardening \
    --ignore-hardening 'cspWithoutUnsafeInline,hstsPreload'

# Wildcards, for the identifiers that carry a path or a port
check-opencloud-security --host opencloud.example.com \
    --ignore-hardening 'debugPort:*'

# Basic auth is deliberately enabled for a migration tool, and the rating
# should reflect that decision rather than stay red for weeks
check-opencloud-security --host opencloud.example.com --check-hardening \
    --ignore-hardening basicAuthDisabled

# Check what a waiver is actually doing before you commit to it: --debug
# lists every waived finding and marks it in the explanation
check-opencloud-security --host opencloud.example.com --check-hardening \
    --ignore-hardening basicAuthDisabled --debug

Both together, in a configuration file

This is the form to prefer for anything permanent, because a waiver can carry a comment explaining why it exists and when it should be revisited:

# /etc/check-opencloud-security/config.yml
host: opencloud.example.com
check_hardening: true
update_warning: true

scanner:
  release_track: production
  ignore_hardenings:
    - cspWithoutUnsafeInline   # default csp.yaml; tightening it breaks the web UI
    - hstsPreload              # the reverse proxy sets its own HSTS header
    - 'debugPort:*'            # debug ports are firewalled at the perimeter

check-opencloud-security --config /etc/check-opencloud-security/config.yml

The same settings as environment variables, for a container or a systemd unit:

export COS_HOST=opencloud.example.com
export COS_CHECK_HARDENING=1
export COS_SCANNER_RELEASE_TRACK=production
export COS_SCANNER_IGNORE_HARDENINGS='cspWithoutUnsafeInline;hstsPreload'
check-opencloud-security

Instances that are not on the public internet

# OpenCloud's own proxy, with a self-signed certificate
check-opencloud-security --host 10.0.0.5 --port 9200 --insecure

# Plain HTTP behind a terminating load balancer
check-opencloud-security --host opencloud.internal --scheme http

# An IPv6 address
check-opencloud-security --host '[2001:db8::1]'

# Air-gapped: no release feed, verdicts from the bundled schedule only
check-opencloud-security --host opencloud.example.com --update-source bundled

# Rate-limited by GitHub, or simply offline: pin the newest release yourself
check-opencloud-security --host opencloud.example.com --latest-version 7.2.3

# Skip the debug-port probes, which cost up to 15 seconds on a firewalled host
check-opencloud-security --host opencloud.example.com --no-debug-ports --timeout 5

Thresholds and notifications

# Stricter than the default: warn at A, go critical at C
check-opencloud-security --host opencloud.example.com --warning 4 --critical 3

# Post to a webhook when the check goes critical
check-opencloud-security --host opencloud.example.com \
    --webhook-url https://hooks.example.com/opencloud \
    --webhook-header 'Authorization: Bearer secret://webhook_token'

# A production instance, hardening reported, two findings accepted,
# notified on anything worse than OK - a realistic complete invocation
check-opencloud-security --host opencloud.example.com \
    --release-track production \
    --check-hardening \
    --ignore-hardening 'cspWithoutUnsafeInline,hstsPreload' \
    --update-warning \
    --warning 4 --critical 2 \
    --webhook-url https://hooks.example.com/opencloud \
    --webhook-on warning

Icinga2 command definition

apply Service "opencloud-security" {
  import "generic-service"
  check_command = "check_opencloud_security"

  vars.opencloud_host           = host.address
  vars.opencloud_check_hardening = true
  vars.opencloud_release_track  = "production"
  vars.opencloud_ignore_hardening = "cspWithoutUnsafeInline,hstsPreload"

  assign where host.vars.opencloud == true
}

The scanner on its own

# One-shot JSON, for a script or an ad-hoc look at the raw result
check-opencloud-scanner scan opencloud.example.com | jq '.rating, .lifecycle'

# Which findings were waived, and which are recorded but not alerted on
check-opencloud-scanner scan opencloud.example.com | jq '.ignored, .extraChecks'

Contributing

Bug reports, feature requests and pull requests are welcome. See CONTRIBUTING.md for the development setup, the test suite, the linting rules and how releases are cut, and CODE_OF_CONDUCT.md for what to expect from everyone involved.

The issue templates ask for the --debug output, which is usually what a fix depends on. Redact tokens and real hostnames before you paste anything - use opencloud.example.com, as the codebase does throughout.

Found a vulnerability in the plugin? Do not open an issue - report it privately, as described in SECURITY.md.

License

Licensed under the terms of GNU General Public License v3.0. See LICENSE file.

This project is built for OpenCloud, whose work makes secure, self-hosted collaboration possible. Thank you to the OpenCloud team.

Trademarks and affiliation

This is an independent community project. It is not affiliated with, endorsed by, sponsored by or supported by OpenCloud GmbH, and nothing it reports is an official statement about OpenCloud software.

"OpenCloud", the OpenCloud logo and all related names and marks are the property of their respective owners. They appear here only to identify the software this tool checks, which is nominative use and implies no relationship. All rights in OpenCloud remain with OpenCloud GmbH.

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Credits

Author: Massoud Ahmed

License

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