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controller.go
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controller.go
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package controller
import (
"context"
"fmt"
"os/exec"
"sync"
"time"
"go.aporeto.io/trireme-lib/collector"
"go.aporeto.io/trireme-lib/common"
"go.aporeto.io/trireme-lib/controller/constants"
"go.aporeto.io/trireme-lib/controller/internal/enforcer"
"go.aporeto.io/trireme-lib/controller/internal/supervisor"
"go.aporeto.io/trireme-lib/controller/pkg/claimsheader"
"go.aporeto.io/trireme-lib/controller/pkg/dmesgparser"
"go.aporeto.io/trireme-lib/controller/pkg/env"
"go.aporeto.io/trireme-lib/controller/pkg/fqconfig"
"go.aporeto.io/trireme-lib/controller/pkg/packettracing"
"go.aporeto.io/trireme-lib/controller/pkg/secrets"
"go.aporeto.io/trireme-lib/controller/runtime"
"go.aporeto.io/trireme-lib/policy"
"go.uber.org/zap"
)
type traceTrigger struct {
duration time.Duration
expiry time.Time
}
// trireme contains references to all the different components of the controller.
// Depending on the configuration we might have multiple supervisor and enforcer types.
// The initialization process must provide the mode that Trireme will run in.
type trireme struct {
config *config
supervisors map[constants.ModeType]supervisor.Supervisor
enforcers map[constants.ModeType]enforcer.Enforcer
puTypeToEnforcerType map[common.PUType]constants.ModeType
enablingTrace chan *traceTrigger
locks sync.Map
}
// New returns a trireme interface implementation based on configuration provided.
func New(serverID string, mode constants.ModeType, opts ...Option) TriremeController {
c := &config{
serverID: serverID,
collector: collector.NewDefaultCollector(),
mode: mode,
fq: fqconfig.NewFilterQueueWithDefaults(),
mutualAuth: true,
validity: time.Hour * 8760,
procMountPoint: constants.DefaultProcMountPoint,
externalIPcacheTimeout: -1,
remoteParameters: &env.RemoteParameters{
LogToConsole: true,
LogFormat: "console",
LogLevel: "info",
LogWithID: false,
CompressedTags: claimsheader.CompressionTypeV1,
},
}
for _, opt := range opts {
opt(c)
}
zap.L().Debug("Trireme configuration", zap.String("configuration", fmt.Sprintf("%+v", c)))
return newTrireme(c)
}
// Run starts the supervisor and the enforcer and go routines. It doesn't try to clean
// up if something went wrong. It will be up to the caller to decide what to do.
func (t *trireme) Run(ctx context.Context) error {
// Start all the supervisors.
for _, s := range t.supervisors {
if err := s.Run(ctx); err != nil {
zap.L().Error("Error when starting the supervisor", zap.Error(err))
return fmt.Errorf("Error while starting supervisor %v", err)
}
}
// Start all the enforcers.
for _, e := range t.enforcers {
if err := e.Run(ctx); err != nil {
return fmt.Errorf("unable to start the enforcer: %s", err)
}
}
go t.runIPTraceCollector(ctx)
return nil
}
// CleanUp cleans all the acls and all the remote supervisors
func (t *trireme) CleanUp() error {
for _, s := range t.supervisors {
s.CleanUp() // nolint
}
for _, e := range t.enforcers {
e.CleanUp() // nolint
}
return nil
}
// Enforce asks the controller to enforce policy to a processing unit
func (t *trireme) Enforce(ctx context.Context, puID string, policy *policy.PUPolicy, runtime *policy.PURuntime) error {
lock, _ := t.locks.LoadOrStore(puID, &sync.Mutex{})
lock.(*sync.Mutex).Lock()
defer lock.(*sync.Mutex).Unlock()
return t.doHandleCreate(puID, policy, runtime)
}
// Enforce asks the controller to enforce policy to a processing unit
func (t *trireme) UnEnforce(ctx context.Context, puID string, policy *policy.PUPolicy, runtime *policy.PURuntime) error {
lock, _ := t.locks.LoadOrStore(puID, &sync.Mutex{})
lock.(*sync.Mutex).Lock()
defer func() {
t.locks.Delete(puID)
lock.(*sync.Mutex).Unlock()
}()
return t.doHandleDelete(puID, runtime)
}
// UpdatePolicy updates a policy for an already activated PU. The PU is identified by the contextID
func (t *trireme) UpdatePolicy(ctx context.Context, puID string, plc *policy.PUPolicy, runtime *policy.PURuntime) error {
lock, _ := t.locks.LoadOrStore(puID, &sync.Mutex{})
lock.(*sync.Mutex).Lock()
defer lock.(*sync.Mutex).Unlock()
return t.doUpdatePolicy(puID, plc, runtime)
}
// UpdateSecrets updates the secrets of the controllers.
func (t *trireme) UpdateSecrets(secrets secrets.Secrets) error {
for _, enforcer := range t.enforcers {
if err := enforcer.UpdateSecrets(secrets); err != nil {
zap.L().Error("unable to update secrets", zap.Error(err))
}
}
return nil
}
// UpdateConfiguration updates the configuration of the controller. Only
// a limited number of parameters can be updated at run time.
func (t *trireme) UpdateConfiguration(cfg *runtime.Configuration) error {
failure := false
for _, s := range t.supervisors {
err := s.SetTargetNetworks(cfg)
if err != nil {
zap.L().Error("Failed to update target networks in supervisor", zap.Error(err))
failure = true
}
}
for _, e := range t.enforcers {
err := e.SetTargetNetworks(cfg)
if err != nil {
zap.L().Error("Failed to update target networks in cotnroller", zap.Error(err))
failure = true
}
}
if failure {
return fmt.Errorf("configuration update failed")
}
return nil
}
// doHandleCreate is the detailed implementation of the create event.
func (t *trireme) doHandleCreate(contextID string, policyInfo *policy.PUPolicy, runtimeInfo *policy.PURuntime) error {
containerInfo := policy.PUInfoFromPolicyAndRuntime(contextID, policyInfo, runtimeInfo)
logEvent := &collector.ContainerRecord{
ContextID: contextID,
IPAddress: policyInfo.IPAddresses(),
Tags: policyInfo.Annotations(),
Event: collector.ContainerStart,
}
defer func() {
t.config.collector.CollectContainerEvent(logEvent)
}()
addTransmitterLabel(contextID, containerInfo)
if !mustEnforce(contextID, containerInfo) {
logEvent.Event = collector.ContainerIgnored
return nil
}
if err := t.enforcers[t.puTypeToEnforcerType[containerInfo.Runtime.PUType()]].Enforce(contextID, containerInfo); err != nil {
logEvent.Event = collector.ContainerFailed
return fmt.Errorf("unable to setup enforcer: %s", err)
}
if err := t.supervisors[t.puTypeToEnforcerType[containerInfo.Runtime.PUType()]].Supervise(contextID, containerInfo); err != nil {
if werr := t.enforcers[t.puTypeToEnforcerType[containerInfo.Runtime.PUType()]].Unenforce(contextID); werr != nil {
zap.L().Warn("Failed to clean up state after failures",
zap.String("contextID", contextID),
zap.Error(werr),
)
}
logEvent.Event = collector.ContainerFailed
return fmt.Errorf("unable to setup supervisor: %s", err)
}
return nil
}
// doHandleDelete is the detailed implementation of the delete event.
func (t *trireme) doHandleDelete(contextID string, runtime *policy.PURuntime) error {
errS := t.supervisors[t.puTypeToEnforcerType[runtime.PUType()]].Unsupervise(contextID)
errE := t.enforcers[t.puTypeToEnforcerType[runtime.PUType()]].Unenforce(contextID)
t.config.collector.CollectContainerEvent(&collector.ContainerRecord{
ContextID: contextID,
IPAddress: runtime.IPAddresses(),
Tags: nil,
Event: collector.ContainerDelete,
})
if errS != nil || errE != nil {
return fmt.Errorf("unable to delete context id %s, supervisor %s, enforcer %s", contextID, errS, errE)
}
return nil
}
// doUpdatePolicy is the detailed implementation of the update policy event.
func (t *trireme) doUpdatePolicy(contextID string, newPolicy *policy.PUPolicy, runtime *policy.PURuntime) error {
containerInfo := policy.PUInfoFromPolicyAndRuntime(contextID, newPolicy, runtime)
addTransmitterLabel(contextID, containerInfo)
if !mustEnforce(contextID, containerInfo) {
return nil
}
if err := t.enforcers[t.puTypeToEnforcerType[containerInfo.Runtime.PUType()]].Enforce(contextID, containerInfo); err != nil {
//We lost communication with the remote and killed it lets restart it here by feeding a create event in the request channel
if werr := t.supervisors[t.puTypeToEnforcerType[containerInfo.Runtime.PUType()]].Unsupervise(contextID); werr != nil {
zap.L().Warn("Failed to clean up after enforcerments failures",
zap.String("contextID", contextID),
zap.Error(werr),
)
}
return fmt.Errorf("unable to update policy for pu %s: %s", contextID, err)
}
if err := t.supervisors[t.puTypeToEnforcerType[containerInfo.Runtime.PUType()]].Supervise(contextID, containerInfo); err != nil {
if werr := t.enforcers[t.puTypeToEnforcerType[containerInfo.Runtime.PUType()]].Unenforce(contextID); werr != nil {
zap.L().Warn("Failed to clean up after enforcerments failures",
zap.String("contextID", contextID),
zap.Error(werr),
)
}
return fmt.Errorf("supervisor failed to update policy for pu %s: %s", contextID, err)
}
t.config.collector.CollectContainerEvent(&collector.ContainerRecord{
ContextID: contextID,
IPAddress: runtime.IPAddresses(),
Tags: containerInfo.Runtime.Tags(),
Event: collector.ContainerUpdate,
})
return nil
}
//Debug Handlers
func (t *trireme) EnableDatapathPacketTracing(contextID string, direction packettracing.TracingDirection, interval time.Duration, putype common.PUType) error {
return t.enforcers[t.puTypeToEnforcerType[putype]].EnableDatapathPacketTracing(contextID, direction, interval)
}
func (t *trireme) EnableIPTablesPacketTracing(ctx context.Context, contextID string, interval time.Duration, putype common.PUType) error {
sysctlCmd, err := exec.LookPath("sysctl")
if err != nil {
return fmt.Errorf("sysctl command not found")
}
cmd := exec.Command(sysctlCmd, "-w", "net.netfilter.nf_log_all_netns=1")
if err := cmd.Run(); err != nil {
return fmt.Errorf("remote container iptables tracing will not work %s", err)
}
t.enablingTrace <- &traceTrigger{
duration: interval,
expiry: time.Now().Add(interval),
}
if err := t.supervisors[t.puTypeToEnforcerType[putype]].EnableIPTablesPacketTracing(ctx, contextID, interval); err != nil {
return err
}
return t.enforcers[t.puTypeToEnforcerType[putype]].EnableIPTablesPacketTracing(ctx, contextID, interval)
}
func (t *trireme) runIPTraceCollector(ctx context.Context) {
//Run dmesg once to establish baseline
expiry := time.Now()
hdl := dmesgparser.New()
for {
select {
case <-ctx.Done():
return
case traceparams := <-t.enablingTrace:
if !traceparams.expiry.After(expiry) {
//if we already have a request expiring later drop this
continue
}
expiry = traceparams.expiry
case <-time.After(1 * time.Second):
if !time.Now().After(expiry) {
messages, err := hdl.RunDmesgCommand()
if err != nil {
zap.L().Warn("Unable to run dmesg", zap.Error(err))
continue
}
t.config.collector.CollectTraceEvent(messages)
}
}
}
}