mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-11-10 08:20:23 +00:00
d300da19b7
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
208 lines
5.7 KiB
Go
208 lines
5.7 KiB
Go
/*
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Copyright 2018 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package utils
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import (
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"bufio"
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"fmt"
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"io"
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"sort"
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"strings"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/apimachinery/pkg/runtime/schema"
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"k8s.io/apimachinery/pkg/types"
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auditinternal "k8s.io/apiserver/pkg/apis/audit"
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"k8s.io/apiserver/pkg/audit"
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)
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// AuditEvent is a simplified representation of an audit event for testing purposes
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type AuditEvent struct {
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ID types.UID
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Level auditinternal.Level
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Stage auditinternal.Stage
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RequestURI string
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Verb string
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Code int32
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User string
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ImpersonatedUser string
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ImpersonatedGroups string
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Resource string
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Namespace string
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RequestObject bool
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ResponseObject bool
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AuthorizeDecision string
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}
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// MissingEventsReport provides an analysis if any events are missing
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type MissingEventsReport struct {
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FirstEventChecked *auditinternal.Event
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LastEventChecked *auditinternal.Event
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NumEventsChecked int
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MissingEvents []AuditEvent
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}
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// String returns a human readable string representation of the report
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func (m *MissingEventsReport) String() string {
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return fmt.Sprintf(`missing %d events
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- first event checked: %#v
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- last event checked: %#v
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- number of events checked: %d
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- missing events: %#v`, len(m.MissingEvents), m.FirstEventChecked, m.LastEventChecked, m.NumEventsChecked, m.MissingEvents)
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}
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// CheckAuditLines searches the audit log for the expected audit lines.
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func CheckAuditLines(stream io.Reader, expected []AuditEvent, version schema.GroupVersion) (missingReport *MissingEventsReport, err error) {
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expectations := buildEventExpectations(expected)
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scanner := bufio.NewScanner(stream)
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missingReport = &MissingEventsReport{
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MissingEvents: expected,
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}
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var i int
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for i = 0; scanner.Scan(); i++ {
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line := scanner.Text()
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e := &auditinternal.Event{}
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decoder := audit.Codecs.UniversalDecoder(version)
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if err := runtime.DecodeInto(decoder, []byte(line), e); err != nil {
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return missingReport, fmt.Errorf("failed decoding buf: %s, apiVersion: %s", line, version)
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}
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if i == 0 {
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missingReport.FirstEventChecked = e
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}
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missingReport.LastEventChecked = e
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event, err := testEventFromInternal(e)
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if err != nil {
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return missingReport, err
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}
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// If the event was expected, mark it as found.
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if _, found := expectations[event]; found {
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expectations[event] = true
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}
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}
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if err := scanner.Err(); err != nil {
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return missingReport, err
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}
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missingEvents := findMissing(expectations)
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missingReport.MissingEvents = missingEvents
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missingReport.NumEventsChecked = i
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return missingReport, nil
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}
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// CheckAuditList searches an audit event list for the expected audit events.
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func CheckAuditList(el auditinternal.EventList, expected []AuditEvent) (missing []AuditEvent, err error) {
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expectations := buildEventExpectations(expected)
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for _, e := range el.Items {
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event, err := testEventFromInternal(&e)
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if err != nil {
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return expected, err
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}
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// If the event was expected, mark it as found.
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if _, found := expectations[event]; found {
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expectations[event] = true
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}
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}
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missing = findMissing(expectations)
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return missing, nil
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}
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// CheckForDuplicates checks a list for duplicate events
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func CheckForDuplicates(el auditinternal.EventList) (auditinternal.EventList, error) {
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// eventMap holds a map of audit events with just a nil value
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eventMap := map[AuditEvent]*bool{}
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duplicates := auditinternal.EventList{}
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var err error
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for _, e := range el.Items {
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event, err := testEventFromInternal(&e)
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if err != nil {
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return duplicates, err
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}
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event.ID = e.AuditID
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if _, ok := eventMap[event]; ok {
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duplicates.Items = append(duplicates.Items, e)
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err = fmt.Errorf("failed duplicate check")
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continue
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}
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eventMap[event] = nil
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}
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return duplicates, err
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}
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// buildEventExpectations creates a bool map out of a list of audit events
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func buildEventExpectations(expected []AuditEvent) map[AuditEvent]bool {
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expectations := map[AuditEvent]bool{}
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for _, event := range expected {
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expectations[event] = false
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}
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return expectations
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}
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// testEventFromInternal takes an internal audit event and returns a test event
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func testEventFromInternal(e *auditinternal.Event) (AuditEvent, error) {
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event := AuditEvent{
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Level: e.Level,
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Stage: e.Stage,
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RequestURI: e.RequestURI,
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Verb: e.Verb,
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User: e.User.Username,
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}
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if e.ObjectRef != nil {
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event.Namespace = e.ObjectRef.Namespace
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event.Resource = e.ObjectRef.Resource
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}
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if e.ResponseStatus != nil {
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event.Code = e.ResponseStatus.Code
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}
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if e.ResponseObject != nil {
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event.ResponseObject = true
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}
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if e.RequestObject != nil {
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event.RequestObject = true
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}
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if e.ImpersonatedUser != nil {
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event.ImpersonatedUser = e.ImpersonatedUser.Username
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sort.Strings(e.ImpersonatedUser.Groups)
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event.ImpersonatedGroups = strings.Join(e.ImpersonatedUser.Groups, ",")
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}
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event.AuthorizeDecision = e.Annotations["authorization.k8s.io/decision"]
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return event, nil
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}
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// findMissing checks for false values in the expectations map and returns them as a list
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func findMissing(expectations map[AuditEvent]bool) []AuditEvent {
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var missing []AuditEvent
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for event, found := range expectations {
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if !found {
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missing = append(missing, event)
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}
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}
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return missing
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}
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