-
Notifications
You must be signed in to change notification settings - Fork 51
/
pucontext.go
408 lines (339 loc) · 12.2 KB
/
pucontext.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
package pucontext
import (
"fmt"
"net"
"strconv"
"strings"
"sync"
"time"
"go.aporeto.io/trireme-lib/common"
"go.aporeto.io/trireme-lib/controller/internal/enforcer/acls"
"go.aporeto.io/trireme-lib/controller/internal/enforcer/lookup"
"go.aporeto.io/trireme-lib/controller/pkg/packet"
"go.aporeto.io/trireme-lib/policy"
"go.aporeto.io/trireme-lib/utils/cache"
)
type policies struct {
observeRejectRules *lookup.PolicyDB // Packet: Continue Report: Drop
rejectRules *lookup.PolicyDB // Packet: Drop Report: Drop
observeAcceptRules *lookup.PolicyDB // Packet: Continue Report: Forward
acceptRules *lookup.PolicyDB // Packet: Forward Report: Forward
observeApplyRules *lookup.PolicyDB // Packet: Forward Report: Forward
encryptRules *lookup.PolicyDB // Packet: Encrypt Report: Encrypt
}
// PUContext holds data indexed by the PU ID
type PUContext struct {
id string
managementID string
identity *policy.TagStore
annotations *policy.TagStore
txt *policies
rcv *policies
applicationTCPACLs *acls.ACLCache
networkTCPACLs *acls.ACLCache
applicationUDPACLs *acls.ACLCache
networkUDPACLs *acls.ACLCache
externalIPCache cache.DataStore
mark string
ProxyPort string
tcpPorts []string
udpPorts []string
puType common.PUType
synToken []byte
synServiceContext []byte
synExpiration time.Time
jwt string
jwtExpiration time.Time
scopes []string
Extension interface{}
sync.RWMutex
}
const (
tcp = "tcp"
udp = "udp"
)
// NewPU creates a new PU context
func NewPU(contextID string, puInfo *policy.PUInfo, timeout time.Duration) (*PUContext, error) {
pu := &PUContext{
id: contextID,
managementID: puInfo.Policy.ManagementID(),
puType: puInfo.Runtime.PUType(),
identity: puInfo.Policy.Identity(),
annotations: puInfo.Policy.Annotations(),
externalIPCache: cache.NewCacheWithExpiration("External IP Cache", timeout),
applicationTCPACLs: acls.NewACLCache(),
networkTCPACLs: acls.NewACLCache(),
applicationUDPACLs: acls.NewACLCache(),
networkUDPACLs: acls.NewACLCache(),
mark: puInfo.Runtime.Options().CgroupMark,
scopes: puInfo.Policy.Scopes(),
}
pu.CreateRcvRules(puInfo.Policy.ReceiverRules())
pu.CreateTxtRules(puInfo.Policy.TransmitterRules())
tcpPorts, udpPorts := common.ConvertServicesToProtocolPortList(puInfo.Runtime.Options().Services)
pu.tcpPorts = strings.Split(tcpPorts, ",")
pu.udpPorts = strings.Split(udpPorts, ",")
if err := pu.applicationTCPACLs.AddRuleList(puInfo.Policy.ApplicationACLsProtocol(tcp)); err != nil {
return nil, err
}
if err := pu.networkTCPACLs.AddRuleList(puInfo.Policy.NetworkACLsProtocol(tcp)); err != nil {
return nil, err
}
if err := pu.applicationUDPACLs.AddRuleList(puInfo.Policy.ApplicationACLsProtocol(udp)); err != nil {
return nil, err
}
if err := pu.networkUDPACLs.AddRuleList(puInfo.Policy.NetworkACLsProtocol(udp)); err != nil {
return nil, err
}
return pu, nil
}
// ID returns the ID of the PU
func (p *PUContext) ID() string {
return p.id
}
// ManagementID returns the management ID
func (p *PUContext) ManagementID() string {
return p.managementID
}
// Type return the pu type
func (p *PUContext) Type() common.PUType {
return p.puType
}
// Identity returns the indentity
func (p *PUContext) Identity() *policy.TagStore {
return p.identity
}
// Mark returns the PU mark
func (p *PUContext) Mark() string {
return p.mark
}
// TCPPorts returns the PU TCP ports
func (p *PUContext) TCPPorts() []string {
return p.tcpPorts
}
// UDPPorts returns the PU UDP ports
func (p *PUContext) UDPPorts() []string {
return p.udpPorts
}
// Annotations returns the annotations
func (p *PUContext) Annotations() *policy.TagStore {
return p.annotations
}
// RetrieveCachedExternalFlowPolicy returns the policy for an external IP
func (p *PUContext) RetrieveCachedExternalFlowPolicy(id string) (interface{}, error) {
return p.externalIPCache.Get(id)
}
// NetworkACLPolicy retrieves the policy based on ACLs
func (p *PUContext) NetworkACLPolicy(packet *packet.Packet) (report *policy.FlowPolicy, action *policy.FlowPolicy, err error) {
return p.networkTCPACLs.GetMatchingAction(packet.SourceAddress.To4(), packet.DestinationPort)
}
// NetworkACLPolicyFromAddr retrieve the policy given an address and port.
func (p *PUContext) NetworkACLPolicyFromAddr(addr net.IP, port uint16) (report *policy.FlowPolicy, action *policy.FlowPolicy, err error) {
return p.networkTCPACLs.GetMatchingAction(addr, port)
}
// NetworkUDPACLPolicyFromAddr retrieve the policy given an address and port.
func (p *PUContext) NetworkUDPACLPolicyFromAddr(addr net.IP, port uint16) (report *policy.FlowPolicy, action *policy.FlowPolicy, err error) {
return p.networkUDPACLs.GetMatchingAction(addr, port)
}
// ApplicationACLPolicy retrieves the policy based on ACLs
func (p *PUContext) ApplicationACLPolicy(packet *packet.Packet) (report *policy.FlowPolicy, action *policy.FlowPolicy, err error) {
return p.applicationTCPACLs.GetMatchingAction(packet.SourceAddress.To4(), packet.SourcePort)
}
// ApplicationACLPolicyFromAddr retrieve the policy given an address and port.
func (p *PUContext) ApplicationACLPolicyFromAddr(addr net.IP, port uint16) (report *policy.FlowPolicy, action *policy.FlowPolicy, err error) {
return p.applicationTCPACLs.GetMatchingAction(addr, port)
}
// ApplicationUDPACLPolicyFromAddr retrieve the policy given an address and port.
func (p *PUContext) ApplicationUDPACLPolicyFromAddr(addr net.IP, port uint16) (report *policy.FlowPolicy, action *policy.FlowPolicy, err error) {
return p.applicationUDPACLs.GetMatchingAction(addr, port)
}
// CacheExternalFlowPolicy will cache an external flow
func (p *PUContext) CacheExternalFlowPolicy(packet *packet.Packet, plc interface{}) {
p.externalIPCache.AddOrUpdate(packet.SourceAddress.String()+":"+strconv.Itoa(int(packet.SourcePort)), plc)
}
// GetProcessKeys returns the cache keys for a process
func (p *PUContext) GetProcessKeys() (string, []string, []string) {
return p.mark, p.tcpPorts, p.udpPorts
}
// SynServiceContext returns synServiceContext
func (p *PUContext) SynServiceContext() []byte {
p.RLock()
defer p.RUnlock()
return p.synServiceContext
}
// UpdateSynServiceContext updates the synServiceContext
func (p *PUContext) UpdateSynServiceContext(synServiceContext []byte) {
p.Lock()
p.synServiceContext = synServiceContext
p.Unlock()
}
// GetCachedTokenAndServiceContext returns the cached syn packet token
func (p *PUContext) GetCachedTokenAndServiceContext() ([]byte, []byte, error) {
p.RLock()
defer p.RUnlock()
if p.synExpiration.After(time.Now()) && len(p.synToken) > 0 {
token := make([]byte, len(p.synToken))
copy(token, p.synToken)
return token, p.synServiceContext, nil
}
return nil, nil, fmt.Errorf("expired Token")
}
// UpdateCachedTokenAndServiceContext updates the local cached token
func (p *PUContext) UpdateCachedTokenAndServiceContext(token []byte, serviceContext []byte) {
p.Lock()
p.synToken = token
p.synExpiration = time.Now().Add(time.Millisecond * 500)
p.synServiceContext = serviceContext
p.Unlock()
}
// Scopes returns the scopes.
func (p *PUContext) Scopes() []string {
p.RLock()
defer p.RUnlock()
return p.scopes
}
// GetJWT retrieves the JWT if it exists in the cache. Returns error otherwise.
func (p *PUContext) GetJWT() (string, error) {
p.RLock()
defer p.RUnlock()
if p.jwtExpiration.After(time.Now()) && len(p.jwt) > 0 {
return p.jwt, nil
}
return "", fmt.Errorf("expired token")
}
// UpdateJWT updates the JWT and provides a new expiration date.
func (p *PUContext) UpdateJWT(jwt string, expiration time.Time) {
p.Lock()
defer p.Unlock()
p.jwt = jwt
p.jwtExpiration = expiration
}
// createRuleDBs creates the database of rules from the policy
func (p *PUContext) createRuleDBs(policyRules policy.TagSelectorList) *policies {
policyDB := &policies{
rejectRules: lookup.NewPolicyDB(),
observeRejectRules: lookup.NewPolicyDB(),
acceptRules: lookup.NewPolicyDB(),
observeAcceptRules: lookup.NewPolicyDB(),
observeApplyRules: lookup.NewPolicyDB(),
encryptRules: lookup.NewPolicyDB(),
}
for _, rule := range policyRules {
// Add encrypt rule to encrypt table.
if rule.Policy.Action.Encrypted() {
policyDB.encryptRules.AddPolicy(rule)
}
if rule.Policy.ObserveAction.ObserveContinue() {
if rule.Policy.Action.Accepted() {
policyDB.observeAcceptRules.AddPolicy(rule)
} else if rule.Policy.Action.Rejected() {
policyDB.observeRejectRules.AddPolicy(rule)
}
} else if rule.Policy.ObserveAction.ObserveApply() {
policyDB.observeApplyRules.AddPolicy(rule)
} else if rule.Policy.Action.Accepted() {
policyDB.acceptRules.AddPolicy(rule)
} else if rule.Policy.Action.Rejected() {
policyDB.rejectRules.AddPolicy(rule)
} else {
continue
}
}
return policyDB
}
// CreateRcvRules create receive rules for this PU based on the update of the policy.
func (p *PUContext) CreateRcvRules(policyRules policy.TagSelectorList) {
p.rcv = p.createRuleDBs(policyRules)
}
// CreateTxtRules create receive rules for this PU based on the update of the policy.
func (p *PUContext) CreateTxtRules(policyRules policy.TagSelectorList) {
p.txt = p.createRuleDBs(policyRules)
}
// searchRules searches all reject, accpet and observed rules and returns reporting and packet forwarding action
func (p *PUContext) searchRules(
policies *policies,
tags *policy.TagStore,
skipRejectPolicies bool,
) (report *policy.FlowPolicy, packet *policy.FlowPolicy) {
var reportingAction *policy.FlowPolicy
var packetAction *policy.FlowPolicy
if !skipRejectPolicies {
// Look for rejection rules
observeIndex, observeAction := policies.observeRejectRules.Search(tags)
if observeIndex >= 0 {
reportingAction = observeAction.(*policy.FlowPolicy)
}
// TODO: Is this if case required ?
if packetAction == nil {
index, action := policies.rejectRules.Search(tags)
if index >= 0 {
packetAction = action.(*policy.FlowPolicy)
if reportingAction == nil {
reportingAction = packetAction
}
return reportingAction, packetAction
}
}
}
if reportingAction == nil {
// Look for allow rules
observeIndex, observeAction := policies.observeAcceptRules.Search(tags)
if observeIndex >= 0 {
reportingAction = observeAction.(*policy.FlowPolicy)
}
}
if packetAction == nil {
index, action := policies.acceptRules.Search(tags)
if index >= 0 {
packetAction = action.(*policy.FlowPolicy)
// Look for encrypt rules
encryptIndex, _ := policies.encryptRules.Search(tags)
if encryptIndex >= 0 {
// Do not overwrite the action for accept rules.
finalAction := action.(*policy.FlowPolicy)
packetAction = &policy.FlowPolicy{
Action: policy.Accept | policy.Encrypt,
PolicyID: finalAction.PolicyID,
ServiceID: finalAction.ServiceID,
}
}
if reportingAction == nil {
reportingAction = packetAction
}
return reportingAction, packetAction
}
}
// Look for observe apply rules
observeIndex, observeAction := policies.observeApplyRules.Search(tags)
if observeIndex >= 0 {
packetAction = observeAction.(*policy.FlowPolicy)
if reportingAction == nil {
reportingAction = packetAction
}
return reportingAction, packetAction
}
// Handle default if nothing provides to drop with no policyID.
if packetAction == nil {
packetAction = &policy.FlowPolicy{
Action: policy.Reject,
PolicyID: "default",
}
}
if reportingAction == nil {
reportingAction = packetAction
}
return reportingAction, packetAction
}
// SearchTxtRules searches both receive and observed transmit rules and returns the index and action
func (p *PUContext) SearchTxtRules(
tags *policy.TagStore,
skipRejectPolicies bool,
) (report *policy.FlowPolicy, packet *policy.FlowPolicy) {
return p.searchRules(p.txt, tags, skipRejectPolicies)
}
// SearchRcvRules searches both receive and observed receive rules and returns the index and action
func (p *PUContext) SearchRcvRules(
tags *policy.TagStore,
) (report *policy.FlowPolicy, packet *policy.FlowPolicy) {
return p.searchRules(p.rcv, tags, false)
}