Pierre-Olivier Mercier
7eb0dbddc7
CalDAV and CardDAV checkers sharing a single Go module. Discovery follows RFC 6764 (/.well-known + SRV/TXT), authenticated probes cover principal, home-set, collections and a minimal REPORT query on top of go-webdav. Common shape in internal/dav/; CalDAV adds a scheduling rule. Surfaces its context URL (and each secure-SRV target) as TLS endpoints via the EndpointDiscoverer interface, so the dedicated TLS checker can pick them up without re-parsing observations. HTML report foregrounds common misconfigs (well-known returning 200, missing SRV, plaintext-only SRV, missing DAV capability, skipped auth phase) as action-item callouts before the full phase breakdown.
75 lines
3.1 KiB
Markdown
75 lines
3.1 KiB
Markdown
# checker-dav
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happyDomain checkers for **CalDAV** (RFC 4791) and **CardDAV** (RFC 6352)
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servers. Discovery (RFC 6764) + OPTIONS + authenticated PROPFIND/REPORT
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probes, with an opinionated HTML report that foregrounds common misconfigs.
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Two binaries are produced from this module:
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| Binary | Checker ID | Entrypoint |
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|------------------|------------|---------------------------------|
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| `checker-caldav` | `caldav` | `./cmd/checker-caldav` |
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| `checker-carddav`| `carddav` | `./cmd/checker-carddav` |
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Shared code lives in `internal/dav/`: discovery, OPTIONS parsing, raw-XML
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PROPFIND helpers, the rule set, and the HTML template.
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## Build
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```
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make # builds both binaries
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make checker-caldav # one binary
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make plugin # .so plugins for in-process loading
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make docker # both Docker images
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make test # unit tests
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```
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## Run
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```
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./checker-caldav -listen :8080
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```
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The SDK exposes `/definition`, `/collect`, `/evaluate`, `/report`, and
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`/health` as usual. Pass `Accept: text/html` on `/report` to get the HTML
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view; the default is a JSON metrics dump.
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## Options
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Both checkers accept the same options:
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- `domain_name` (auto-filled) — required
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- `username`, `password` — optional Basic credentials; unlock authenticated
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checks (principal, home-set, collections, REPORT probe)
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- `context_url` — optional explicit override, bypasses `/.well-known` + SRV
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- `timeout_seconds` — per-request HTTP timeout, default 10
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## What is checked
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1. **Discovery** — `/.well-known/{caldav,carddav}` (must 3xx, not 200),
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`_caldavs._tcp` / `_carddavs._tcp` SRV, TXT `path=` hint.
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2. **Transport** — HTTPS reachable. TLS certificate validation is
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deliberately out of scope — a dedicated TLS checker covers that.
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3. **OPTIONS** — `DAV:` advertises `calendar-access` or `addressbook`; Allow
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includes `PROPFIND` and `REPORT`; auth schemes captured for info.
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4. **Principal** — PROPFIND `current-user-principal` (auth required).
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5. **Home-set** — `calendar-home-set` / `addressbook-home-set`.
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6. **Collections** — enumerate, record properties (`supported-calendar-component-set`,
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`supported-address-data`, display name, description, max size).
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7. **REPORT probe** — issue a minimal `calendar-query` / `addressbook-query`
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against the first collection.
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8. **Scheduling** (CalDAV only) — if `calendar-schedule` is advertised,
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verify `schedule-inbox-URL` and `schedule-outbox-URL` on the principal.
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The HTML report surfaces the most common failures at the top as callouts:
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- `/.well-known` returns 200 instead of 301/302
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- No SRV and no well-known → service unreachable
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- Plaintext SRV record without secure counterpart
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- Server does not advertise the required DAV class (wrong endpoint or stripping proxy)
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- No credentials supplied → authenticated phase skipped
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## Dependencies
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- [`github.com/emersion/go-webdav`](https://github.com/emersion/go-webdav) — CalDAV/CardDAV client
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- [`git.happydns.org/checker-sdk-go`](https://git.happydns.org/happyDomain/checker-sdk-go) — checker SDK
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