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datapath.go
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datapath.go
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package nfqdatapath
// Go libraries
import (
"context"
"fmt"
"os/exec"
"time"
"go.uber.org/zap"
"go.aporeto.io/netlink-go/conntrack"
"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/constants"
"go.aporeto.io/trireme-lib/controller/internal/enforcer/nfqdatapath/nflog"
"go.aporeto.io/trireme-lib/controller/internal/enforcer/nfqdatapath/tokenaccessor"
"go.aporeto.io/trireme-lib/controller/internal/portset"
"go.aporeto.io/trireme-lib/controller/pkg/connection"
"go.aporeto.io/trireme-lib/controller/pkg/fqconfig"
"go.aporeto.io/trireme-lib/controller/pkg/packet"
"go.aporeto.io/trireme-lib/controller/pkg/packetprocessor"
"go.aporeto.io/trireme-lib/controller/pkg/pucontext"
"go.aporeto.io/trireme-lib/controller/pkg/secrets"
"go.aporeto.io/trireme-lib/policy"
"go.aporeto.io/trireme-lib/utils/cache"
"go.aporeto.io/trireme-lib/utils/portcache"
"go.aporeto.io/trireme-lib/utils/portspec"
)
// DefaultExternalIPTimeout is the default used for the cache for External IPTimeout.
const DefaultExternalIPTimeout = "500ms"
// Datapath is the structure holding all information about a connection filter
type Datapath struct {
// Configuration parameters
filterQueue *fqconfig.FilterQueue
collector collector.EventCollector
tokenAccessor tokenaccessor.TokenAccessor
service packetprocessor.PacketProcessor
secrets secrets.Secrets
nflogger nflog.NFLogger
procMountPoint string
// Internal structures and caches
// Key=ContextId Value=puContext
puFromContextID cache.DataStore
puFromMark cache.DataStore
contextIDFromPort *portcache.PortCache
// For remotes this is a reverse link to the context
puFromIP *pucontext.PUContext
// Hash based on source IP/Port to capture SynAck packets with possible NAT.
// When a new connection is created, we has the source IP/port. A return
// poacket might come with a different source IP NAT is done later.
// If we don't receife a return SynAck in 20 seconds, it expires
sourcePortConnectionCache cache.DataStore
// Hash on full five-tuple and return the connection
// These are auto-expired connections after 60 seconds of inactivity.
appOrigConnectionTracker cache.DataStore
appReplyConnectionTracker cache.DataStore
netOrigConnectionTracker cache.DataStore
netReplyConnectionTracker cache.DataStore
unknownSynConnectionTracker cache.DataStore
// CacheTimeout used for Trireme auto-detecion
ExternalIPCacheTimeout time.Duration
// connctrack handle
conntrackHdl conntrack.Conntrack
// mode captures the mode of the enforcer
mode constants.ModeType
// ack size
ackSize uint32
mutualAuthorization bool
packetLogs bool
portSetInstance portset.PortSet
}
// New will create a new data path structure. It instantiates the data stores
// needed to track sessions. The data path is started with a different call.
// Only required parameters must be provided. Rest a pre-populated with defaults.
func New(
mutualAuth bool,
filterQueue *fqconfig.FilterQueue,
collector collector.EventCollector,
serverID string,
validity time.Duration,
service packetprocessor.PacketProcessor,
secrets secrets.Secrets,
mode constants.ModeType,
procMountPoint string,
ExternalIPCacheTimeout time.Duration,
packetLogs bool,
tokenaccessor tokenaccessor.TokenAccessor,
puFromContextID cache.DataStore,
) *Datapath {
if ExternalIPCacheTimeout <= 0 {
var err error
ExternalIPCacheTimeout, err = time.ParseDuration(enforcerconstants.DefaultExternalIPTimeout)
if err != nil {
ExternalIPCacheTimeout = time.Second
}
}
if mode == constants.RemoteContainer || mode == constants.LocalServer {
// Make conntrack liberal for TCP
sysctlCmd, err := exec.LookPath("sysctl")
if err != nil {
zap.L().Fatal("sysctl command must be installed", zap.Error(err))
}
cmd := exec.Command(sysctlCmd, "-w", "net.netfilter.nf_conntrack_tcp_be_liberal=1")
if err := cmd.Run(); err != nil {
zap.L().Fatal("Failed to set conntrack options", zap.Error(err))
}
if mode == constants.LocalServer {
cmd = exec.Command(sysctlCmd, "-w", "net.ipv4.ip_early_demux=0")
if err := cmd.Run(); err != nil {
zap.L().Fatal("Failed to set early demux options", zap.Error(err))
}
}
}
// This cache is shared with portSetInstance. The portSetInstance
// cleans up the entry corresponding to port when port is no longer
// part of ipset portset.
contextIDFromPort := portcache.NewPortCache("contextIDFromPort")
var portSetInstance portset.PortSet
if mode != constants.RemoteContainer {
portSetInstance = portset.New(contextIDFromPort)
}
d := &Datapath{
puFromMark: cache.NewCache("puFromMark"),
contextIDFromPort: contextIDFromPort,
puFromContextID: puFromContextID,
sourcePortConnectionCache: cache.NewCacheWithExpiration("sourcePortConnectionCache", time.Second*24),
appOrigConnectionTracker: cache.NewCacheWithExpiration("appOrigConnectionTracker", time.Second*24),
appReplyConnectionTracker: cache.NewCacheWithExpiration("appReplyConnectionTracker", time.Second*24),
netOrigConnectionTracker: cache.NewCacheWithExpiration("netOrigConnectionTracker", time.Second*24),
netReplyConnectionTracker: cache.NewCacheWithExpiration("netReplyConnectionTracker", time.Second*24),
unknownSynConnectionTracker: cache.NewCacheWithExpiration("unknownSynConnectionTracker", time.Second*2),
ExternalIPCacheTimeout: ExternalIPCacheTimeout,
filterQueue: filterQueue,
mutualAuthorization: mutualAuth,
service: service,
collector: collector,
tokenAccessor: tokenaccessor,
secrets: secrets,
ackSize: secrets.AckSize(),
mode: mode,
procMountPoint: procMountPoint,
conntrackHdl: conntrack.NewHandle(),
portSetInstance: portSetInstance,
packetLogs: packetLogs,
}
packet.PacketLogLevel = packetLogs
d.nflogger = nflog.NewNFLogger(11, 10, d.puInfoDelegate, collector)
return d
}
// NewWithDefaults create a new data path with most things used by default
func NewWithDefaults(
serverID string,
collector collector.EventCollector,
service packetprocessor.PacketProcessor,
secrets secrets.Secrets,
mode constants.ModeType,
procMountPoint string,
) *Datapath {
if collector == nil {
zap.L().Fatal("Collector must be given to NewDefaultDatapathEnforcer")
}
defaultMutualAuthorization := false
defaultFQConfig := fqconfig.NewFilterQueueWithDefaults()
defaultValidity := time.Hour * 8760
defaultExternalIPCacheTimeout, err := time.ParseDuration(enforcerconstants.DefaultExternalIPTimeout)
if err != nil {
defaultExternalIPCacheTimeout = time.Second
}
defaultPacketLogs := false
tokenAccessor, err := tokenaccessor.New(serverID, defaultValidity, secrets)
if err != nil {
zap.L().Fatal("Cannot create a token engine")
}
puFromContextID := cache.NewCache("puFromContextID")
return New(
defaultMutualAuthorization,
defaultFQConfig,
collector,
serverID,
defaultValidity,
service,
secrets,
mode,
procMountPoint,
defaultExternalIPCacheTimeout,
defaultPacketLogs,
tokenAccessor,
puFromContextID,
)
}
// Enforce implements the Enforce interface method and configures the data path for a new PU
func (d *Datapath) Enforce(contextID string, puInfo *policy.PUInfo) error {
zap.L().Debug("Called Proxy Enforce")
// Always create a new PU context
pu, err := pucontext.NewPU(contextID, puInfo, d.ExternalIPCacheTimeout)
if err != nil {
return fmt.Errorf("error creating new pu: %s", err)
}
// Cache PUs for retrieval based on packet information
if pu.Type() == common.LinuxProcessPU || pu.Type() == common.UIDLoginPU {
mark, ports := pu.GetProcessKeys()
d.puFromMark.AddOrUpdate(mark, pu)
for _, port := range ports {
portSpec, err := portspec.NewPortSpecFromString(port, contextID)
if err != nil {
continue
}
d.contextIDFromPort.AddPortSpec(portSpec)
}
} else {
d.puFromIP = pu
}
// Cache PU from contextID for management and policy updates
d.puFromContextID.AddOrUpdate(contextID, pu)
return nil
}
// Unenforce removes the configuration for the given PU
func (d *Datapath) Unenforce(contextID string) error {
puContext, err := d.puFromContextID.Get(contextID)
if err != nil {
return fmt.Errorf("contextid not found in enforcer: %s", err)
}
// Cleanup the IP based lookup
pu := puContext.(*pucontext.PUContext)
// Cleanup the mark information
if err := d.puFromMark.Remove(pu.Mark()); err != nil {
zap.L().Debug("Unable to remove cache entry during unenforcement",
zap.String("Mark", pu.Mark()),
zap.Error(err),
)
}
// Cleanup the port cache
for _, port := range pu.Ports() {
if err := d.contextIDFromPort.RemoveStringPorts(port); err != nil {
zap.L().Debug("Unable to remove cache entry during unenforcement",
zap.String("Port", port),
zap.Error(err),
)
}
}
// Cleanup the contextID cache
if err := d.puFromContextID.RemoveWithDelay(contextID, 10*time.Second); err != nil {
zap.L().Warn("Unable to remove context from cache",
zap.String("contextID", contextID),
zap.Error(err),
)
}
return nil
}
// GetFilterQueue returns the filter queues used by the data path
func (d *Datapath) GetFilterQueue() *fqconfig.FilterQueue {
return d.filterQueue
}
// GetPortSetInstance returns the portset instance used by data path
func (d *Datapath) GetPortSetInstance() portset.PortSet {
return d.portSetInstance
}
// Run starts the application and network interceptors
func (d *Datapath) Run(ctx context.Context) error {
zap.L().Debug("Start enforcer", zap.Int("mode", int(d.mode)))
if d.service != nil {
d.service.Initialize(d.secrets, d.filterQueue)
}
d.startApplicationInterceptor(ctx)
d.startNetworkInterceptor(ctx)
go d.nflogger.Run(ctx)
return nil
}
// UpdateSecrets updates the secrets used for signing communication between trireme instances
func (d *Datapath) UpdateSecrets(token secrets.Secrets) error {
d.secrets = token
return d.tokenAccessor.SetToken(d.tokenAccessor.GetTokenServerID(), d.tokenAccessor.GetTokenValidity(), token)
}
func (d *Datapath) puInfoDelegate(contextID string) (ID string, tags *policy.TagStore) {
item, err := d.puFromContextID.Get(contextID)
if err != nil {
return
}
ctx := item.(*pucontext.PUContext)
ID = ctx.ManagementID()
tags = ctx.Annotations().Copy()
return
}
func (d *Datapath) reportFlow(p *packet.Packet, connection *connection.TCPConnection, sourceID string, destID string, context *pucontext.PUContext, mode string, report *policy.FlowPolicy, packet *policy.FlowPolicy) {
c := &collector.FlowRecord{
ContextID: context.ID(),
Source: &collector.EndPoint{
ID: sourceID,
IP: p.SourceAddress.String(),
Port: p.SourcePort,
Type: collector.EnpointTypePU,
},
Destination: &collector.EndPoint{
ID: destID,
IP: p.DestinationAddress.String(),
Port: p.DestinationPort,
Type: collector.EnpointTypePU,
},
Tags: context.Annotations(),
Action: report.Action,
DropReason: mode,
PolicyID: report.PolicyID,
L4Protocol: p.IPProto,
}
if report.ObserveAction.Observed() {
c.ObservedAction = packet.Action
c.ObservedPolicyID = packet.PolicyID
}
d.collector.CollectFlowEvent(c)
}