mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-12-26 23:10:22 +00:00
613 lines
20 KiB
Go
613 lines
20 KiB
Go
|
/*
|
||
|
|
Copyright 2017 The Kubernetes Authors.
|
||
|
|
|
||
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
||
|
|
you may not use this file except in compliance with the License.
|
||
|
|
You may obtain a copy of the License at
|
||
|
|
|
||
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
||
|
|
|
||
|
|
Unless required by applicable law or agreed to in writing, software
|
||
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
||
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||
|
|
See the License for the specific language governing permissions and
|
||
|
|
limitations under the License.
|
||
|
|
*/
|
||
|
|
|
||
|
|
package options
|
||
|
|
|
||
|
|
import (
|
||
|
|
"fmt"
|
||
|
|
"io"
|
||
|
|
"os"
|
||
|
|
"path/filepath"
|
||
|
|
"strings"
|
||
|
|
"time"
|
||
|
|
|
||
|
|
"github.com/spf13/pflag"
|
||
|
|
"gopkg.in/natefinch/lumberjack.v2"
|
||
|
|
"k8s.io/klog/v2"
|
||
|
|
|
||
|
|
"k8s.io/apimachinery/pkg/runtime/schema"
|
||
|
|
utilnet "k8s.io/apimachinery/pkg/util/net"
|
||
|
|
"k8s.io/apimachinery/pkg/util/sets"
|
||
|
|
auditinternal "k8s.io/apiserver/pkg/apis/audit"
|
||
|
|
auditv1 "k8s.io/apiserver/pkg/apis/audit/v1"
|
||
|
|
"k8s.io/apiserver/pkg/audit"
|
||
|
|
"k8s.io/apiserver/pkg/audit/policy"
|
||
|
|
"k8s.io/apiserver/pkg/server"
|
||
|
|
"k8s.io/apiserver/pkg/server/egressselector"
|
||
|
|
"k8s.io/apiserver/pkg/util/webhook"
|
||
|
|
pluginbuffered "k8s.io/apiserver/plugin/pkg/audit/buffered"
|
||
|
|
pluginlog "k8s.io/apiserver/plugin/pkg/audit/log"
|
||
|
|
plugintruncate "k8s.io/apiserver/plugin/pkg/audit/truncate"
|
||
|
|
pluginwebhook "k8s.io/apiserver/plugin/pkg/audit/webhook"
|
||
|
|
)
|
||
|
|
|
||
|
|
const (
|
||
|
|
// Default configuration values for ModeBatch.
|
||
|
|
defaultBatchBufferSize = 10000 // Buffer up to 10000 events before starting discarding.
|
||
|
|
// These batch parameters are only used by the webhook backend.
|
||
|
|
defaultBatchMaxSize = 400 // Only send up to 400 events at a time.
|
||
|
|
defaultBatchMaxWait = 30 * time.Second // Send events at least twice a minute.
|
||
|
|
defaultBatchThrottleQPS = 10 // Limit the send rate by 10 QPS.
|
||
|
|
defaultBatchThrottleBurst = 15 // Allow up to 15 QPS burst.
|
||
|
|
)
|
||
|
|
|
||
|
|
func appendBackend(existing, newBackend audit.Backend) audit.Backend {
|
||
|
|
if existing == nil {
|
||
|
|
return newBackend
|
||
|
|
}
|
||
|
|
if newBackend == nil {
|
||
|
|
return existing
|
||
|
|
}
|
||
|
|
return audit.Union(existing, newBackend)
|
||
|
|
}
|
||
|
|
|
||
|
|
type AuditOptions struct {
|
||
|
|
// Policy configuration file for filtering audit events that are captured.
|
||
|
|
// If unspecified, a default is provided.
|
||
|
|
PolicyFile string
|
||
|
|
|
||
|
|
// Plugin options
|
||
|
|
LogOptions AuditLogOptions
|
||
|
|
WebhookOptions AuditWebhookOptions
|
||
|
|
}
|
||
|
|
|
||
|
|
const (
|
||
|
|
// ModeBatch indicates that the audit backend should buffer audit events
|
||
|
|
// internally, sending batch updates either once a certain number of
|
||
|
|
// events have been received or a certain amount of time has passed.
|
||
|
|
ModeBatch = "batch"
|
||
|
|
// ModeBlocking causes the audit backend to block on every attempt to process
|
||
|
|
// a set of events. This causes requests to the API server to wait for the
|
||
|
|
// flush before sending a response.
|
||
|
|
ModeBlocking = "blocking"
|
||
|
|
// ModeBlockingStrict is the same as ModeBlocking, except when there is
|
||
|
|
// a failure during audit logging at RequestReceived stage, the whole
|
||
|
|
// request to apiserver will fail.
|
||
|
|
ModeBlockingStrict = "blocking-strict"
|
||
|
|
)
|
||
|
|
|
||
|
|
// AllowedModes is the modes known for audit backends.
|
||
|
|
var AllowedModes = []string{
|
||
|
|
ModeBatch,
|
||
|
|
ModeBlocking,
|
||
|
|
ModeBlockingStrict,
|
||
|
|
}
|
||
|
|
|
||
|
|
type AuditBatchOptions struct {
|
||
|
|
// Should the backend asynchronous batch events to the webhook backend or
|
||
|
|
// should the backend block responses?
|
||
|
|
//
|
||
|
|
// Defaults to asynchronous batch events.
|
||
|
|
Mode string
|
||
|
|
// Configuration for batching backend. Only used in batch mode.
|
||
|
|
BatchConfig pluginbuffered.BatchConfig
|
||
|
|
}
|
||
|
|
|
||
|
|
type AuditTruncateOptions struct {
|
||
|
|
// Whether truncating is enabled or not.
|
||
|
|
Enabled bool
|
||
|
|
|
||
|
|
// Truncating configuration.
|
||
|
|
TruncateConfig plugintruncate.Config
|
||
|
|
}
|
||
|
|
|
||
|
|
// AuditLogOptions determines the output of the structured audit log by default.
|
||
|
|
type AuditLogOptions struct {
|
||
|
|
Path string
|
||
|
|
MaxAge int
|
||
|
|
MaxBackups int
|
||
|
|
MaxSize int
|
||
|
|
Format string
|
||
|
|
Compress bool
|
||
|
|
|
||
|
|
BatchOptions AuditBatchOptions
|
||
|
|
TruncateOptions AuditTruncateOptions
|
||
|
|
|
||
|
|
// API group version used for serializing audit events.
|
||
|
|
GroupVersionString string
|
||
|
|
}
|
||
|
|
|
||
|
|
// AuditWebhookOptions control the webhook configuration for audit events.
|
||
|
|
type AuditWebhookOptions struct {
|
||
|
|
ConfigFile string
|
||
|
|
InitialBackoff time.Duration
|
||
|
|
|
||
|
|
BatchOptions AuditBatchOptions
|
||
|
|
TruncateOptions AuditTruncateOptions
|
||
|
|
|
||
|
|
// API group version used for serializing audit events.
|
||
|
|
GroupVersionString string
|
||
|
|
}
|
||
|
|
|
||
|
|
func NewAuditOptions() *AuditOptions {
|
||
|
|
return &AuditOptions{
|
||
|
|
WebhookOptions: AuditWebhookOptions{
|
||
|
|
InitialBackoff: pluginwebhook.DefaultInitialBackoffDelay,
|
||
|
|
BatchOptions: AuditBatchOptions{
|
||
|
|
Mode: ModeBatch,
|
||
|
|
BatchConfig: defaultWebhookBatchConfig(),
|
||
|
|
},
|
||
|
|
TruncateOptions: NewAuditTruncateOptions(),
|
||
|
|
GroupVersionString: "audit.k8s.io/v1",
|
||
|
|
},
|
||
|
|
LogOptions: AuditLogOptions{
|
||
|
|
Format: pluginlog.FormatJson,
|
||
|
|
BatchOptions: AuditBatchOptions{
|
||
|
|
Mode: ModeBlocking,
|
||
|
|
BatchConfig: defaultLogBatchConfig(),
|
||
|
|
},
|
||
|
|
TruncateOptions: NewAuditTruncateOptions(),
|
||
|
|
GroupVersionString: "audit.k8s.io/v1",
|
||
|
|
},
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
func NewAuditTruncateOptions() AuditTruncateOptions {
|
||
|
|
return AuditTruncateOptions{
|
||
|
|
Enabled: false,
|
||
|
|
TruncateConfig: plugintruncate.Config{
|
||
|
|
MaxBatchSize: 10 * 1024 * 1024, // 10MB
|
||
|
|
MaxEventSize: 100 * 1024, // 100KB
|
||
|
|
},
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// Validate checks invalid config combination
|
||
|
|
func (o *AuditOptions) Validate() []error {
|
||
|
|
if o == nil {
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
var allErrors []error
|
||
|
|
allErrors = append(allErrors, o.LogOptions.Validate()...)
|
||
|
|
allErrors = append(allErrors, o.WebhookOptions.Validate()...)
|
||
|
|
|
||
|
|
return allErrors
|
||
|
|
}
|
||
|
|
|
||
|
|
func validateBackendMode(pluginName string, mode string) error {
|
||
|
|
for _, m := range AllowedModes {
|
||
|
|
if m == mode {
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return fmt.Errorf("invalid audit %s mode %s, allowed modes are %q", pluginName, mode, strings.Join(AllowedModes, ","))
|
||
|
|
}
|
||
|
|
|
||
|
|
func validateBackendBatchOptions(pluginName string, options AuditBatchOptions) error {
|
||
|
|
if err := validateBackendMode(pluginName, options.Mode); err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
if options.Mode != ModeBatch {
|
||
|
|
// Don't validate the unused options.
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
config := options.BatchConfig
|
||
|
|
if config.BufferSize <= 0 {
|
||
|
|
return fmt.Errorf("invalid audit batch %s buffer size %v, must be a positive number", pluginName, config.BufferSize)
|
||
|
|
}
|
||
|
|
if config.MaxBatchSize <= 0 {
|
||
|
|
return fmt.Errorf("invalid audit batch %s max batch size %v, must be a positive number", pluginName, config.MaxBatchSize)
|
||
|
|
}
|
||
|
|
if config.ThrottleEnable {
|
||
|
|
if config.ThrottleQPS <= 0 {
|
||
|
|
return fmt.Errorf("invalid audit batch %s throttle QPS %v, must be a positive number", pluginName, config.ThrottleQPS)
|
||
|
|
}
|
||
|
|
if config.ThrottleBurst <= 0 {
|
||
|
|
return fmt.Errorf("invalid audit batch %s throttle burst %v, must be a positive number", pluginName, config.ThrottleBurst)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
var knownGroupVersions = []schema.GroupVersion{
|
||
|
|
auditv1.SchemeGroupVersion,
|
||
|
|
}
|
||
|
|
|
||
|
|
func validateGroupVersionString(groupVersion string) error {
|
||
|
|
gv, err := schema.ParseGroupVersion(groupVersion)
|
||
|
|
if err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
if !knownGroupVersion(gv) {
|
||
|
|
return fmt.Errorf("invalid group version, allowed versions are %q", knownGroupVersions)
|
||
|
|
}
|
||
|
|
if gv != auditv1.SchemeGroupVersion {
|
||
|
|
klog.Warningf("%q is deprecated and will be removed in a future release, use %q instead", gv, auditv1.SchemeGroupVersion)
|
||
|
|
}
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func knownGroupVersion(gv schema.GroupVersion) bool {
|
||
|
|
for _, knownGv := range knownGroupVersions {
|
||
|
|
if gv == knownGv {
|
||
|
|
return true
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return false
|
||
|
|
}
|
||
|
|
|
||
|
|
func (o *AuditOptions) AddFlags(fs *pflag.FlagSet) {
|
||
|
|
if o == nil {
|
||
|
|
return
|
||
|
|
}
|
||
|
|
|
||
|
|
fs.StringVar(&o.PolicyFile, "audit-policy-file", o.PolicyFile,
|
||
|
|
"Path to the file that defines the audit policy configuration.")
|
||
|
|
|
||
|
|
o.LogOptions.AddFlags(fs)
|
||
|
|
o.LogOptions.BatchOptions.AddFlags(pluginlog.PluginName, fs)
|
||
|
|
o.LogOptions.TruncateOptions.AddFlags(pluginlog.PluginName, fs)
|
||
|
|
o.WebhookOptions.AddFlags(fs)
|
||
|
|
o.WebhookOptions.BatchOptions.AddFlags(pluginwebhook.PluginName, fs)
|
||
|
|
o.WebhookOptions.TruncateOptions.AddFlags(pluginwebhook.PluginName, fs)
|
||
|
|
}
|
||
|
|
|
||
|
|
func (o *AuditOptions) ApplyTo(
|
||
|
|
c *server.Config,
|
||
|
|
) error {
|
||
|
|
if o == nil {
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
if c == nil {
|
||
|
|
return fmt.Errorf("server config must be non-nil")
|
||
|
|
}
|
||
|
|
|
||
|
|
// 1. Build policy evaluator
|
||
|
|
evaluator, err := o.newPolicyRuleEvaluator()
|
||
|
|
if err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
|
||
|
|
// 2. Build log backend
|
||
|
|
var logBackend audit.Backend
|
||
|
|
w, err := o.LogOptions.getWriter()
|
||
|
|
if err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
if w != nil {
|
||
|
|
if evaluator == nil {
|
||
|
|
klog.V(2).Info("No audit policy file provided, no events will be recorded for log backend")
|
||
|
|
} else {
|
||
|
|
logBackend = o.LogOptions.newBackend(w)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// 3. Build webhook backend
|
||
|
|
var webhookBackend audit.Backend
|
||
|
|
if o.WebhookOptions.enabled() {
|
||
|
|
if evaluator == nil {
|
||
|
|
klog.V(2).Info("No audit policy file provided, no events will be recorded for webhook backend")
|
||
|
|
} else {
|
||
|
|
if c.EgressSelector != nil {
|
||
|
|
var egressDialer utilnet.DialFunc
|
||
|
|
egressDialer, err = c.EgressSelector.Lookup(egressselector.ControlPlane.AsNetworkContext())
|
||
|
|
if err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
webhookBackend, err = o.WebhookOptions.newUntruncatedBackend(egressDialer)
|
||
|
|
} else {
|
||
|
|
webhookBackend, err = o.WebhookOptions.newUntruncatedBackend(nil)
|
||
|
|
}
|
||
|
|
if err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
groupVersion, err := schema.ParseGroupVersion(o.WebhookOptions.GroupVersionString)
|
||
|
|
if err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
|
||
|
|
// 4. Apply dynamic options.
|
||
|
|
var dynamicBackend audit.Backend
|
||
|
|
if webhookBackend != nil {
|
||
|
|
// if only webhook is enabled wrap it in the truncate options
|
||
|
|
dynamicBackend = o.WebhookOptions.TruncateOptions.wrapBackend(webhookBackend, groupVersion)
|
||
|
|
}
|
||
|
|
|
||
|
|
// 5. Set the policy rule evaluator
|
||
|
|
c.AuditPolicyRuleEvaluator = evaluator
|
||
|
|
|
||
|
|
// 6. Join the log backend with the webhooks
|
||
|
|
c.AuditBackend = appendBackend(logBackend, dynamicBackend)
|
||
|
|
|
||
|
|
if c.AuditBackend != nil {
|
||
|
|
klog.V(2).Infof("Using audit backend: %s", c.AuditBackend)
|
||
|
|
}
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func (o *AuditOptions) newPolicyRuleEvaluator() (audit.PolicyRuleEvaluator, error) {
|
||
|
|
if o.PolicyFile == "" {
|
||
|
|
return nil, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
p, err := policy.LoadPolicyFromFile(o.PolicyFile)
|
||
|
|
if err != nil {
|
||
|
|
return nil, fmt.Errorf("loading audit policy file: %v", err)
|
||
|
|
}
|
||
|
|
return policy.NewPolicyRuleEvaluator(p), nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func (o *AuditBatchOptions) AddFlags(pluginName string, fs *pflag.FlagSet) {
|
||
|
|
fs.StringVar(&o.Mode, fmt.Sprintf("audit-%s-mode", pluginName), o.Mode,
|
||
|
|
"Strategy for sending audit events. Blocking indicates sending events should block"+
|
||
|
|
" server responses. Batch causes the backend to buffer and write events"+
|
||
|
|
" asynchronously. Known modes are "+strings.Join(AllowedModes, ",")+".")
|
||
|
|
fs.IntVar(&o.BatchConfig.BufferSize, fmt.Sprintf("audit-%s-batch-buffer-size", pluginName),
|
||
|
|
o.BatchConfig.BufferSize, "The size of the buffer to store events before "+
|
||
|
|
"batching and writing. Only used in batch mode.")
|
||
|
|
fs.IntVar(&o.BatchConfig.MaxBatchSize, fmt.Sprintf("audit-%s-batch-max-size", pluginName),
|
||
|
|
o.BatchConfig.MaxBatchSize, "The maximum size of a batch. Only used in batch mode.")
|
||
|
|
fs.DurationVar(&o.BatchConfig.MaxBatchWait, fmt.Sprintf("audit-%s-batch-max-wait", pluginName),
|
||
|
|
o.BatchConfig.MaxBatchWait, "The amount of time to wait before force writing the "+
|
||
|
|
"batch that hadn't reached the max size. Only used in batch mode.")
|
||
|
|
fs.BoolVar(&o.BatchConfig.ThrottleEnable, fmt.Sprintf("audit-%s-batch-throttle-enable", pluginName),
|
||
|
|
o.BatchConfig.ThrottleEnable, "Whether batching throttling is enabled. Only used in batch mode.")
|
||
|
|
fs.Float32Var(&o.BatchConfig.ThrottleQPS, fmt.Sprintf("audit-%s-batch-throttle-qps", pluginName),
|
||
|
|
o.BatchConfig.ThrottleQPS, "Maximum average number of batches per second. "+
|
||
|
|
"Only used in batch mode.")
|
||
|
|
fs.IntVar(&o.BatchConfig.ThrottleBurst, fmt.Sprintf("audit-%s-batch-throttle-burst", pluginName),
|
||
|
|
o.BatchConfig.ThrottleBurst, "Maximum number of requests sent at the same "+
|
||
|
|
"moment if ThrottleQPS was not utilized before. Only used in batch mode.")
|
||
|
|
}
|
||
|
|
|
||
|
|
type ignoreErrorsBackend struct {
|
||
|
|
audit.Backend
|
||
|
|
}
|
||
|
|
|
||
|
|
func (i *ignoreErrorsBackend) ProcessEvents(ev ...*auditinternal.Event) bool {
|
||
|
|
i.Backend.ProcessEvents(ev...)
|
||
|
|
return true
|
||
|
|
}
|
||
|
|
|
||
|
|
func (i *ignoreErrorsBackend) String() string {
|
||
|
|
return fmt.Sprintf("ignoreErrors<%s>", i.Backend)
|
||
|
|
}
|
||
|
|
|
||
|
|
func (o *AuditBatchOptions) wrapBackend(delegate audit.Backend) audit.Backend {
|
||
|
|
if o.Mode == ModeBlockingStrict {
|
||
|
|
return delegate
|
||
|
|
}
|
||
|
|
if o.Mode == ModeBlocking {
|
||
|
|
return &ignoreErrorsBackend{Backend: delegate}
|
||
|
|
}
|
||
|
|
return pluginbuffered.NewBackend(delegate, o.BatchConfig)
|
||
|
|
}
|
||
|
|
|
||
|
|
func (o *AuditTruncateOptions) Validate(pluginName string) error {
|
||
|
|
config := o.TruncateConfig
|
||
|
|
if config.MaxEventSize <= 0 {
|
||
|
|
return fmt.Errorf("invalid audit truncate %s max event size %v, must be a positive number", pluginName, config.MaxEventSize)
|
||
|
|
}
|
||
|
|
if config.MaxBatchSize < config.MaxEventSize {
|
||
|
|
return fmt.Errorf("invalid audit truncate %s max batch size %v, must be greater than "+
|
||
|
|
"max event size (%v)", pluginName, config.MaxBatchSize, config.MaxEventSize)
|
||
|
|
}
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func (o *AuditTruncateOptions) AddFlags(pluginName string, fs *pflag.FlagSet) {
|
||
|
|
fs.BoolVar(&o.Enabled, fmt.Sprintf("audit-%s-truncate-enabled", pluginName),
|
||
|
|
o.Enabled, "Whether event and batch truncating is enabled.")
|
||
|
|
fs.Int64Var(&o.TruncateConfig.MaxBatchSize, fmt.Sprintf("audit-%s-truncate-max-batch-size", pluginName),
|
||
|
|
o.TruncateConfig.MaxBatchSize, "Maximum size of the batch sent to the underlying backend. "+
|
||
|
|
"Actual serialized size can be several hundreds of bytes greater. If a batch exceeds this limit, "+
|
||
|
|
"it is split into several batches of smaller size.")
|
||
|
|
fs.Int64Var(&o.TruncateConfig.MaxEventSize, fmt.Sprintf("audit-%s-truncate-max-event-size", pluginName),
|
||
|
|
o.TruncateConfig.MaxEventSize, "Maximum size of the audit event sent to the underlying backend. "+
|
||
|
|
"If the size of an event is greater than this number, first request and response are removed, and "+
|
||
|
|
"if this doesn't reduce the size enough, event is discarded.")
|
||
|
|
}
|
||
|
|
|
||
|
|
func (o *AuditTruncateOptions) wrapBackend(delegate audit.Backend, gv schema.GroupVersion) audit.Backend {
|
||
|
|
if !o.Enabled {
|
||
|
|
return delegate
|
||
|
|
}
|
||
|
|
return plugintruncate.NewBackend(delegate, o.TruncateConfig, gv)
|
||
|
|
}
|
||
|
|
|
||
|
|
func (o *AuditLogOptions) AddFlags(fs *pflag.FlagSet) {
|
||
|
|
fs.StringVar(&o.Path, "audit-log-path", o.Path,
|
||
|
|
"If set, all requests coming to the apiserver will be logged to this file. '-' means standard out.")
|
||
|
|
fs.IntVar(&o.MaxAge, "audit-log-maxage", o.MaxAge,
|
||
|
|
"The maximum number of days to retain old audit log files based on the timestamp encoded in their filename.")
|
||
|
|
fs.IntVar(&o.MaxBackups, "audit-log-maxbackup", o.MaxBackups,
|
||
|
|
"The maximum number of old audit log files to retain. Setting a value of 0 will mean there's no restriction on the number of files.")
|
||
|
|
fs.IntVar(&o.MaxSize, "audit-log-maxsize", o.MaxSize,
|
||
|
|
"The maximum size in megabytes of the audit log file before it gets rotated.")
|
||
|
|
fs.StringVar(&o.Format, "audit-log-format", o.Format,
|
||
|
|
"Format of saved audits. \"legacy\" indicates 1-line text format for each event."+
|
||
|
|
" \"json\" indicates structured json format. Known formats are "+
|
||
|
|
strings.Join(pluginlog.AllowedFormats, ",")+".")
|
||
|
|
fs.StringVar(&o.GroupVersionString, "audit-log-version", o.GroupVersionString,
|
||
|
|
"API group and version used for serializing audit events written to log.")
|
||
|
|
fs.BoolVar(&o.Compress, "audit-log-compress", o.Compress, "If set, the rotated log files will be compressed using gzip.")
|
||
|
|
}
|
||
|
|
|
||
|
|
func (o *AuditLogOptions) Validate() []error {
|
||
|
|
// Check whether the log backend is enabled based on the options.
|
||
|
|
if !o.enabled() {
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
var allErrors []error
|
||
|
|
|
||
|
|
if err := validateBackendBatchOptions(pluginlog.PluginName, o.BatchOptions); err != nil {
|
||
|
|
allErrors = append(allErrors, err)
|
||
|
|
}
|
||
|
|
if err := o.TruncateOptions.Validate(pluginlog.PluginName); err != nil {
|
||
|
|
allErrors = append(allErrors, err)
|
||
|
|
}
|
||
|
|
|
||
|
|
if err := validateGroupVersionString(o.GroupVersionString); err != nil {
|
||
|
|
allErrors = append(allErrors, err)
|
||
|
|
}
|
||
|
|
|
||
|
|
// Check log format
|
||
|
|
if !sets.NewString(pluginlog.AllowedFormats...).Has(o.Format) {
|
||
|
|
allErrors = append(allErrors, fmt.Errorf("invalid audit log format %s, allowed formats are %q", o.Format, strings.Join(pluginlog.AllowedFormats, ",")))
|
||
|
|
}
|
||
|
|
|
||
|
|
// Check validities of MaxAge, MaxBackups and MaxSize of log options, if file log backend is enabled.
|
||
|
|
if o.MaxAge < 0 {
|
||
|
|
allErrors = append(allErrors, fmt.Errorf("--audit-log-maxage %v can't be a negative number", o.MaxAge))
|
||
|
|
}
|
||
|
|
if o.MaxBackups < 0 {
|
||
|
|
allErrors = append(allErrors, fmt.Errorf("--audit-log-maxbackup %v can't be a negative number", o.MaxBackups))
|
||
|
|
}
|
||
|
|
if o.MaxSize < 0 {
|
||
|
|
allErrors = append(allErrors, fmt.Errorf("--audit-log-maxsize %v can't be a negative number", o.MaxSize))
|
||
|
|
}
|
||
|
|
|
||
|
|
return allErrors
|
||
|
|
}
|
||
|
|
|
||
|
|
// Check whether the log backend is enabled based on the options.
|
||
|
|
func (o *AuditLogOptions) enabled() bool {
|
||
|
|
return o != nil && o.Path != ""
|
||
|
|
}
|
||
|
|
|
||
|
|
func (o *AuditLogOptions) getWriter() (io.Writer, error) {
|
||
|
|
if !o.enabled() {
|
||
|
|
return nil, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
if o.Path == "-" {
|
||
|
|
return os.Stdout, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
if err := o.ensureLogFile(); err != nil {
|
||
|
|
return nil, fmt.Errorf("ensureLogFile: %w", err)
|
||
|
|
}
|
||
|
|
|
||
|
|
return &lumberjack.Logger{
|
||
|
|
Filename: o.Path,
|
||
|
|
MaxAge: o.MaxAge,
|
||
|
|
MaxBackups: o.MaxBackups,
|
||
|
|
MaxSize: o.MaxSize,
|
||
|
|
Compress: o.Compress,
|
||
|
|
}, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func (o *AuditLogOptions) ensureLogFile() error {
|
||
|
|
if err := os.MkdirAll(filepath.Dir(o.Path), 0700); err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
mode := os.FileMode(0600)
|
||
|
|
f, err := os.OpenFile(o.Path, os.O_CREATE|os.O_APPEND|os.O_RDWR, mode)
|
||
|
|
if err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
return f.Close()
|
||
|
|
}
|
||
|
|
|
||
|
|
func (o *AuditLogOptions) newBackend(w io.Writer) audit.Backend {
|
||
|
|
groupVersion, _ := schema.ParseGroupVersion(o.GroupVersionString)
|
||
|
|
log := pluginlog.NewBackend(w, o.Format, groupVersion)
|
||
|
|
log = o.BatchOptions.wrapBackend(log)
|
||
|
|
log = o.TruncateOptions.wrapBackend(log, groupVersion)
|
||
|
|
return log
|
||
|
|
}
|
||
|
|
|
||
|
|
func (o *AuditWebhookOptions) AddFlags(fs *pflag.FlagSet) {
|
||
|
|
fs.StringVar(&o.ConfigFile, "audit-webhook-config-file", o.ConfigFile,
|
||
|
|
"Path to a kubeconfig formatted file that defines the audit webhook configuration.")
|
||
|
|
fs.DurationVar(&o.InitialBackoff, "audit-webhook-initial-backoff",
|
||
|
|
o.InitialBackoff, "The amount of time to wait before retrying the first failed request.")
|
||
|
|
fs.DurationVar(&o.InitialBackoff, "audit-webhook-batch-initial-backoff",
|
||
|
|
o.InitialBackoff, "The amount of time to wait before retrying the first failed request.")
|
||
|
|
fs.MarkDeprecated("audit-webhook-batch-initial-backoff",
|
||
|
|
"Deprecated, use --audit-webhook-initial-backoff instead.")
|
||
|
|
fs.StringVar(&o.GroupVersionString, "audit-webhook-version", o.GroupVersionString,
|
||
|
|
"API group and version used for serializing audit events written to webhook.")
|
||
|
|
}
|
||
|
|
|
||
|
|
func (o *AuditWebhookOptions) Validate() []error {
|
||
|
|
if !o.enabled() {
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
var allErrors []error
|
||
|
|
if err := validateBackendBatchOptions(pluginwebhook.PluginName, o.BatchOptions); err != nil {
|
||
|
|
allErrors = append(allErrors, err)
|
||
|
|
}
|
||
|
|
if err := o.TruncateOptions.Validate(pluginwebhook.PluginName); err != nil {
|
||
|
|
allErrors = append(allErrors, err)
|
||
|
|
}
|
||
|
|
|
||
|
|
if err := validateGroupVersionString(o.GroupVersionString); err != nil {
|
||
|
|
allErrors = append(allErrors, err)
|
||
|
|
}
|
||
|
|
return allErrors
|
||
|
|
}
|
||
|
|
|
||
|
|
func (o *AuditWebhookOptions) enabled() bool {
|
||
|
|
return o != nil && o.ConfigFile != ""
|
||
|
|
}
|
||
|
|
|
||
|
|
// newUntruncatedBackend returns a webhook backend without the truncate options applied
|
||
|
|
// this is done so that the same trucate backend can wrap both the webhook and dynamic backends
|
||
|
|
func (o *AuditWebhookOptions) newUntruncatedBackend(customDial utilnet.DialFunc) (audit.Backend, error) {
|
||
|
|
groupVersion, _ := schema.ParseGroupVersion(o.GroupVersionString)
|
||
|
|
webhook, err := pluginwebhook.NewBackend(o.ConfigFile, groupVersion, webhook.DefaultRetryBackoffWithInitialDelay(o.InitialBackoff), customDial)
|
||
|
|
if err != nil {
|
||
|
|
return nil, fmt.Errorf("initializing audit webhook: %v", err)
|
||
|
|
}
|
||
|
|
webhook = o.BatchOptions.wrapBackend(webhook)
|
||
|
|
return webhook, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// defaultWebhookBatchConfig returns the default BatchConfig used by the Webhook backend.
|
||
|
|
func defaultWebhookBatchConfig() pluginbuffered.BatchConfig {
|
||
|
|
return pluginbuffered.BatchConfig{
|
||
|
|
BufferSize: defaultBatchBufferSize,
|
||
|
|
MaxBatchSize: defaultBatchMaxSize,
|
||
|
|
MaxBatchWait: defaultBatchMaxWait,
|
||
|
|
|
||
|
|
ThrottleEnable: true,
|
||
|
|
ThrottleQPS: defaultBatchThrottleQPS,
|
||
|
|
ThrottleBurst: defaultBatchThrottleBurst,
|
||
|
|
|
||
|
|
AsyncDelegate: true,
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// defaultLogBatchConfig returns the default BatchConfig used by the Log backend.
|
||
|
|
func defaultLogBatchConfig() pluginbuffered.BatchConfig {
|
||
|
|
return pluginbuffered.BatchConfig{
|
||
|
|
BufferSize: defaultBatchBufferSize,
|
||
|
|
// Batching is not useful for the log-file backend.
|
||
|
|
// MaxBatchWait ignored.
|
||
|
|
MaxBatchSize: 1,
|
||
|
|
ThrottleEnable: false,
|
||
|
|
// Asynchronous log threads just create lock contention.
|
||
|
|
AsyncDelegate: false,
|
||
|
|
}
|
||
|
|
}
|