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17ffe62d0d
* VAULT-22481: Audit filter node (#24465) * Initial commit on adding filter nodes for audit * tests for audit filter * test: longer filter - more conditions * copywrite headers * Check interface for the right type * Add audit filtering feature (#24554) * Support filter nodes in backend factories and add some tests * More tests and cleanup * Attempt to move control of registration for nodes and pipelines to the audit broker (#24505) * invert control of the pipelines/nodes to the audit broker vs. within each backend * update noop audit test code to implement the pipeliner interface * noop mount path has trailing slash * attempting to make NoopAudit more friendly * NoopAudit uses known salt * Refactor audit.ProcessManual to support filter nodes * HasFiltering * rename the pipeliner * use exported AuditEvent in Filter * Add tests for registering and deregistering backends on the audit broker * Add missing licence header to one file, fix a typo in two tests --------- Co-authored-by: Peter Wilson <peter.wilson@hashicorp.com> * Add changelog file * update bexpr datum to use a strong type * go docs updates * test path * PR review comments * handle scenarios/outcomes from broker.send * don't need to re-check the complete sinks * add extra check to deregister to ensure that re-registering non-filtered device sets sink threshold * Ensure that the multierror is appended before attempting to return it --------- Co-authored-by: Peter Wilson <peter.wilson@hashicorp.com>
92 lines
2.3 KiB
Go
92 lines
2.3 KiB
Go
// Copyright (c) HashiCorp, Inc.
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// SPDX-License-Identifier: BUSL-1.1
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package audit
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import (
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"context"
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"fmt"
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"strings"
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"github.com/hashicorp/eventlogger"
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"github.com/hashicorp/go-bexpr"
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"github.com/hashicorp/vault/helper/namespace"
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"github.com/hashicorp/vault/internal/observability/event"
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)
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var _ eventlogger.Node = (*EntryFilter)(nil)
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// NewEntryFilter should be used to create an EntryFilter node.
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// The filter supplied should be in bexpr format and reference fields from logical.LogInputBexpr.
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func NewEntryFilter(filter string) (*EntryFilter, error) {
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const op = "audit.NewEntryFilter"
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filter = strings.TrimSpace(filter)
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if filter == "" {
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return nil, fmt.Errorf("%s: cannot create new audit filter with empty filter expression: %w", op, event.ErrInvalidParameter)
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}
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eval, err := bexpr.CreateEvaluator(filter)
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if err != nil {
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return nil, fmt.Errorf("%s: cannot create new audit filter: %w", op, err)
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}
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return &EntryFilter{evaluator: eval}, nil
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}
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// Reopen is a no-op for the filter node.
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func (*EntryFilter) Reopen() error {
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return nil
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}
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// Type describes the type of this node (filter).
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func (*EntryFilter) Type() eventlogger.NodeType {
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return eventlogger.NodeTypeFilter
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}
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// Process will attempt to parse the incoming event data and decide whether it
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// should be filtered or remain in the pipeline and passed to the next node.
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func (f *EntryFilter) Process(ctx context.Context, e *eventlogger.Event) (*eventlogger.Event, error) {
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const op = "audit.(EntryFilter).Process"
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select {
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case <-ctx.Done():
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return nil, ctx.Err()
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default:
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}
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if e == nil {
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return nil, fmt.Errorf("%s: event is nil: %w", op, event.ErrInvalidParameter)
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}
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a, ok := e.Payload.(*AuditEvent)
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if !ok {
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return nil, fmt.Errorf("%s: cannot parse event payload: %w", op, event.ErrInvalidParameter)
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}
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// If we don't have data to process, then we're done.
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if a.Data == nil {
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return nil, nil
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}
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ns, err := namespace.FromContext(ctx)
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if err != nil {
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return nil, fmt.Errorf("%s: cannot obtain namespace: %w", op, err)
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}
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datum := a.Data.BexprDatum(ns.Path)
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result, err := f.evaluator.Evaluate(datum)
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if err != nil {
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return nil, fmt.Errorf("%s: unable to evaluate filter: %w", op, err)
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}
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if result {
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// Allow this event to carry on through the pipeline.
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return e, nil
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}
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// End process of this pipeline.
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return nil, nil
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}
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