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connection.go
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connection.go
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package connection
import (
"fmt"
"sync"
"time"
"go.uber.org/zap"
"github.com/aporeto-inc/trireme-lib/enforcer/pucontext"
"github.com/aporeto-inc/trireme-lib/policy"
"github.com/aporeto-inc/trireme-lib/utils/cache"
)
// TCPFlowState identifies the constants of the state of a TCP connectioncon
type TCPFlowState int
// ProxyConnState identifies the constants of the state of a proxied connection
type ProxyConnState int
const (
// TCPSynSend is the state where the Syn packets has been send, but no response has been received
TCPSynSend TCPFlowState = iota
// TCPSynReceived indicates that the syn packet has been received
TCPSynReceived
// TCPSynAckSend indicates that the SynAck packet has been send
TCPSynAckSend
// TCPSynAckReceived is the state where the SynAck has been received
TCPSynAckReceived
// TCPAckSend indicates that the ack packets has been sent
TCPAckSend
// TCPAckProcessed is the state that the negotiation has been completed
TCPAckProcessed
// TCPData indicates that the packets are now data packets
TCPData
)
const (
// ClientTokenSend Init token send for client
ClientTokenSend ProxyConnState = iota
// ServerReceivePeerToken -- waiting to receive peer token
ServerReceivePeerToken
// ServerSendToken -- Send our own token and the client tokens
ServerSendToken
// ClientPeerTokenReceive -- Receive signed tokens from server
ClientPeerTokenReceive
// ClientSendSignedPair -- Sign the (token/nonce pair) and send
ClientSendSignedPair
// ServerAuthenticatePair -- Authenticate pair of tokens
ServerAuthenticatePair
)
const (
// RejectReported represents that flow was reported as rejected
RejectReported bool = true
// AcceptReported represents that flow was reported as accepted
AcceptReported bool = false
)
// AuthInfo keeps authentication information about a connection
type AuthInfo struct {
LocalContext []byte
RemoteContext []byte
RemoteContextID string
RemotePublicKey interface{}
RemoteIP string
RemotePort string
LocalServiceContext []byte
RemoteServiceContext []byte
}
// TCPConnection is information regarding TCP Connection
type TCPConnection struct {
sync.RWMutex
state TCPFlowState
Auth AuthInfo
// Debugging Information
flowReported int
// ServiceData allows services to associate state with a connection
ServiceData interface{}
// Context is the pucontext.PUContext that is associated with this connection
// Minimizes the number of caches and lookups
Context *pucontext.PUContext
// TimeOut signals the timeout to be used by the state machines
TimeOut time.Duration
// Debugging information - pushed to the end for compact structure
flowLastReporting bool
// ServiceConnection indicates that this connection is handled by a service
ServiceConnection bool
// ReportFlowPolicy holds the last matched observed policy
ReportFlowPolicy *policy.FlowPolicy
// PacketFlowPolicy holds the last matched actual policy
PacketFlowPolicy *policy.FlowPolicy
}
// TCPConnectionExpirationNotifier handles processing the expiration of an element
func TCPConnectionExpirationNotifier(c cache.DataStore, id interface{}, item interface{}) {
if conn, ok := item.(*TCPConnection); ok {
conn.Cleanup(true)
}
}
// String returns a printable version of connection
func (c *TCPConnection) String() string {
return fmt.Sprintf("state:%d auth: %+v", c.state, c.Auth)
}
// GetState is used to return the state
func (c *TCPConnection) GetState() TCPFlowState {
return c.state
}
// SetState is used to setup the state for the TCP connection
func (c *TCPConnection) SetState(state TCPFlowState) {
c.state = state
}
// SetReported is used to track if a flow is reported
func (c *TCPConnection) SetReported(flowState bool) {
c.flowReported++
if c.flowReported > 1 && c.flowLastReporting != flowState {
zap.L().Info("Connection reported multiple times",
zap.Int("report count", c.flowReported),
zap.Bool("previous", c.flowLastReporting),
zap.Bool("next", flowState),
)
}
c.flowLastReporting = flowState
}
// Cleanup will provide information when a connection is removed by a timer.
func (c *TCPConnection) Cleanup(expiration bool) {
// Logging information
if c.flowReported == 0 {
zap.L().Error("Connection not reported",
zap.String("connection", c.String()))
}
}
// NewTCPConnection returns a TCPConnection information struct
func NewTCPConnection(context *pucontext.PUContext) *TCPConnection {
return &TCPConnection{
state: TCPSynSend,
Context: context,
}
}
// ProxyConnection is a record to keep state of proxy auth
type ProxyConnection struct {
sync.Mutex
state ProxyConnState
Auth AuthInfo
ReportFlowPolicy *policy.FlowPolicy
PacketFlowPolicy *policy.FlowPolicy
reported bool
}
// NewProxyConnection returns a new Proxy Connection
func NewProxyConnection() *ProxyConnection {
return &ProxyConnection{
state: ClientTokenSend,
}
}
// GetState returns the state of a proxy connection
func (c *ProxyConnection) GetState() ProxyConnState {
return c.state
}
// SetState is used to setup the state for the Proxy Connection
func (c *ProxyConnection) SetState(state ProxyConnState) {
c.state = state
}
// SetReported sets the flag to reported when the conn is reported
func (c *ProxyConnection) SetReported(reported bool) {
c.reported = reported
}