docs: Add page about events (#19243)
This page details the new events experiment that will be released in Vault 1.13. Co-authored-by: Tom Proctor <tomhjp@users.noreply.github.com>
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Christopher Swenson
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---
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layout: docs
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page_title: Events
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description: >-
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Events are an experimental feature that allows Vault and plugins to exchange arbitrary activity data
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within Vault and with external subscribers via WebSockets.
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---
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# Events
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~> **Important:** Events are experimental, and may have backwards incompatible changes introduced in subsequent versions of Vault, or be removed altogether.
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Events are arbitrary, **non-secret** data that can be exchanged between producers (Vault and plugins)
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and subscribers (Vault components and external users via the API).
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Events are delivered on a *best-effort* basis, so do not have delivery guarantees at this time.
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As of Vault 1.13, events are not considered production-ready, and so are disabled by default when starting a Vault server.
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Events can be enabled via the `events.alpha1` [experiment option](/vault/docs/configuration#experiments) in the Vault
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configuration or on the command-line:
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```shell-session
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$ vault server -experiment events.alpha1
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```
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-> Note: Experiments can only be enabled at startup, and cannot be disabled or enabled at runtime.
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## Event Types
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<!-- This information will probably be migrated to the plugin pages eventually -->
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Internal components of Vault as well as external plugins can generate events.
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These are published to "event types", sometimes called "topics" in some event systems.
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All events of a specific event type will have the same format for their
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additional `metadata` field.
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The following events are currently generated by Vault and its builtin plugins automatically:
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| Plugin | Event Type | Vault version |
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| ------ | ----------------------- | ------------- |
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| kv | `kv-v1/delete` | 1.13 |
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| kv | `kv-v1/write` | 1.13 |
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| kv | `kv-v2/config-write` | 1.13 |
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| kv | `kv-v2/data-delete` | 1.13 |
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| kv | `kv-v2/data-patch` | 1.13 |
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| kv | `kv-v2/data-write` | 1.13 |
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| kv | `kv-v2/delete` | 1.13 |
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| kv | `kv-v2/destroy` | 1.13 |
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| kv | `kv-v2/metadata-delete` | 1.13 |
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| kv | `kv-v2/metadata-patch` | 1.13 |
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| kv | `kv-v2/metadata-read` | 1.13 |
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| kv | `kv-v2/metadata-write` | 1.13 |
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| kv | `kv-v2/undelete` | 1.13 |
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## Event Format
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Events may be formatted in protobuf binary format or as JSON.
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See `EventReceived` in [`sdk/logical/event.proto`](https://github.com/hashicorp/vault/blob/main/sdk/logical/event.proto) in the relevant Vault version for the protobuf schema.
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When formatted as JSON, the event conforms to the [CloudEvents](https://cloudevents.io/) specification.
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- `id` `(string)` - CloudEvents unique identifier for the event. The `id` is unique for each event, and events with the same `id` represent the same event.
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- `source` `(string)` - CloudEvents source, which is currently `https://vaultproject.io`.
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- `specversion` `(string)` - The CloudEvents specification version this conforms to.
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- `type` `(string)` - CloudEvents type this event corresponds to, which is currently always `*`.
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- ` datacontenttype` `(string)` - CloudEvents content type of the event, which is currently always `application/json`.
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- `time` `(string)` - ISO 8601-formatted timestamp for when the event was generated.
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- ` data` `(object)` - Vault-specific data.
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- `event` `(Event)` - contains the event that happened.
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- `id` `(string)` - (repeat of the `id` parameter)
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- `metadata` `(object)` - arbitrary extra data customized for the event type.
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- `eventType` `(string)` - the event type that was published.
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- `pluginInfo` `(PluginInfo)` - information about the plugin that generated the event, if applicable.
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- `mountClass` `(string)` - the class of plugin, e.g., `secret`, `auth`.
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- `mountAccessor` `(string)` - the unique ID of the mounted plugin.
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- `mountPath` `(string)` - the path that the plugin is mounted at.
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- `plugin` `(string)` - the name of the plugin, e.g., `kv`.
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Here is an example event in JSON format:
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```json
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{
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"id": "901f2388-aabb-a385-7bc0-0b09d5fa060b",
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"source": "https://vaultproject.io/",
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"specversion": "1.0",
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"type": "*",
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"data": {
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"event": {
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"id": "901f2388-aabb-a385-7bc0-0b09d5fa060b",
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"metadata": {
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"current_version": "1",
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"oldest_version": "0",
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"path": "data/foo"
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}
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},
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"event_type": "kv-v2/data-write",
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"plugin_info": {
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"mount_class": "secret",
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"mount_accessor": "kv_a6081d01",
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"mount_path": "secret/",
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"plugin": "kv"
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}
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},
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"datacontentype": "application/cloudevents",
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"time": "2023-02-17T13:11:39.227341-08:00"
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}
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```
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## Subscribing to Events
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Vault has an API endpoint, `/v1/sys/events/subscribe/{eventType}`, that allows users to subscribe to events via a
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WebSocket stream.
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This endpoint supports the standard authentication and authorization workflows used by other Vault endpoints.
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The `{eventType}` parameter is a non-empty string of what event type to subscribe to, which may contain wildcards (`*`)
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to subscribe to multiple events, e.g., `kv-v2/data-*`.
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By default, the events are delivered in protobuf binary format.
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The endpoint can also format the data as JSON if the `json` query parameter is set to `true`:
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```shell-session
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$ wscat -H "X-Vault-Token: $(vault print token)" --connect 'ws://127.0.0.1:8200/v1/sys/events/subscribe/kv-v2/data-write?json=true
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{"id":"901f2388-aabb-a385-7bc0-0b09d5fa060b","source":"https://vaultproject.io/","specversion":"1.0","type":"*","data":{"event":{"id":"901f2388-aabb-a385-7bc0-0b09d5fa060b","metadata":{"current_version":"1","oldest_version":"0","path":"data/foo"}},"event_type":"kv-v2/data-write","plugin_info":{"mount_class":"secret","mount_accessor":"kv_a6081d01","mount_path":"secret/","plugin":"kv"}},"datacontentype":"application/cloudevents","time":"2023-02-17T13:11:39.227341-08:00"}
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...
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```
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The Vault CLI support this endpoint via the `events subscribe` command, which will output a stream of
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JSON for the requested events (one line per event):
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```shell-session
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$ vault events subscribe kv-v2/data-write
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{"id":"901f2388-aabb-a385-7bc0-0b09d5fa060b","source":"https://vaultproject.io/","specversion":"1.0","type":"*","data":{"event":{"id":"901f2388-aabb-a385-7bc0-0b09d5fa060b","metadata":{"current_version":"1","oldest_version":"0","path":"data/foo"}},"event_type":"kv-v2/data-write","plugin_info":{"mount_class":"secret","mount_accessor":"kv_a6081d01","mount_path":"secret/","plugin":"kv"}},"datacontentype":"application/cloudevents","time":"2023-02-17T13:11:39.227341-08:00"}
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...
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```
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## Policies
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To subscribe, the `read` capability must be granted by a [policy](/vault/docs/concepts/policies)
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on the `/v1/sys/events/subscribe/{eventType}` path, where `{eventType}` is the event type that will be
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subscribed to. The path may contain wildcards.
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An example blanket policy is:
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```hcl
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path "sys/events/subscribe/*" {
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capabilities = ["read"]
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}
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```
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## Supported Versions
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| Vault Version | Support |
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| ------------- | ------------------------------------------- |
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| <= 1.12 | Not supported |
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| 1.13 | Supported (with `events.alpha1` experiment) |
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@ -198,7 +198,16 @@
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{
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"title": "User Lockout",
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"path": "concepts/user-lockout"
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}
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},
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{
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"title": "Events",
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"path": "concepts/events",
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"badge": {
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"text": "ALPHA",
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"type": "outlined",
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"color": "neutral"
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}
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}
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]
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},
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{
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