/
events.go
246 lines (213 loc) · 6.98 KB
/
events.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
package events
import (
"bytes"
"encoding/binary"
"fmt"
"os"
"strconv"
"time"
"github.com/aws/aws-network-policy-agent/pkg/aws"
"github.com/aws/aws-network-policy-agent/pkg/aws/services"
"github.com/aws/aws-network-policy-agent/pkg/utils"
goebpfevents "github.com/aws/aws-ebpf-sdk-go/pkg/events"
awssdk "github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/awserr"
"github.com/aws/aws-sdk-go/service/cloudwatchlogs"
"github.com/go-logr/logr"
"github.com/google/uuid"
"github.com/spf13/pflag"
)
var (
RING_BUFFER_PINPATH = "/sys/fs/bpf/globals/aws/maps/global_policy_events"
cwl services.CloudWatchLogs
logStreamName = ""
logGroupName = ""
sequenceToken = ""
EKS_CW_PATH = "/aws/eks/"
NON_EKS_CW_PATH = "/aws/"
)
type ringBufferDataV4_t struct {
SourceIP uint32
SourcePort uint32
DestIP uint32
DestPort uint32
Protocol uint32
Verdict uint32
}
type ringBufferDataV6_t struct {
SourceIP [16]byte
SourcePort uint32
DestIP [16]byte
DestPort uint32
Protocol uint32
Verdict uint32
}
func ConfigurePolicyEventsLogging(logger logr.Logger, enableCloudWatchLogs bool, mapFD int, enableIPv6 bool) error {
// Enable logging and setup ring buffer
if mapFD <= 0 {
logger.Info("MapFD is invalid")
return fmt.Errorf("Invalid Ringbuffer FD: %d", mapFD)
}
var mapFDList []int
mapFDList = append(mapFDList, mapFD)
eventsClient := goebpfevents.New()
eventChanList, err := eventsClient.InitRingBuffer(mapFDList)
if err != nil {
logger.Info("Failed to Initialize Ring Buffer", "err:", err)
return err
} else {
if enableCloudWatchLogs {
logger.Info("Cloudwatch log support is enabled")
err = setupCW(logger)
if err != nil {
logger.Error(err, "unable to initialize Cloudwatch Logs for Policy events")
return err
}
}
logger.Info("Configure Event loop ... ")
capturePolicyEvents(eventChanList[mapFD], logger, enableCloudWatchLogs, enableIPv6)
}
return nil
}
func setupCW(logger logr.Logger) error {
awsCloudConfig := aws.CloudConfig{}
fs := pflag.NewFlagSet("", pflag.ExitOnError)
awsCloudConfig.BindFlags(fs)
cloud, err := aws.NewCloud(awsCloudConfig)
if err != nil {
logger.Error(err, "unable to initialize AWS cloud session for Cloudwatch logs")
return err
}
cwl = cloud.CloudWatchLogs()
clusterName := cloud.ClusterName()
customlogGroupName := EKS_CW_PATH + clusterName + "/cluster"
if clusterName == utils.DEFAULT_CLUSTER_NAME {
customlogGroupName = NON_EKS_CW_PATH + clusterName + "/cluster"
}
logger.Info("Setup CW", "Setting loggroup Name", customlogGroupName)
err = ensureLogGroupExists(customlogGroupName)
if err != nil {
logger.Error(err, "unable to validate log group presence. Please check IAM permissions")
return err
}
logGroupName = customlogGroupName
return nil
}
func getVerdict(verdict int) string {
verdictStr := "DENY"
if verdict == utils.ACCEPT.Index() {
verdictStr = "ACCEPT"
} else if verdict == utils.EXPIRED_DELETED.Index() {
verdictStr = "EXPIRED/DELETED"
}
return verdictStr
}
func publishDataToCloudwatch(logQueue []*cloudwatchlogs.InputLogEvent, message string, log logr.Logger) bool {
logQueue = append(logQueue, &cloudwatchlogs.InputLogEvent{
Message: &message,
Timestamp: awssdk.Int64(time.Now().UnixNano() / int64(time.Millisecond)),
})
if len(logQueue) > 0 {
log.Info("Sending logs to CW")
input := cloudwatchlogs.PutLogEventsInput{
LogEvents: logQueue,
LogGroupName: &logGroupName,
}
if sequenceToken == "" {
err := createLogStream()
if err != nil {
log.Info("Failed to create log stream")
panic(err)
}
} else {
input = *input.SetSequenceToken(sequenceToken)
}
input = *input.SetLogStreamName(logStreamName)
resp, err := cwl.PutLogEvents(&input)
if err != nil {
log.Info("Push log events", "Failed ", err)
}
if resp != nil {
sequenceToken = *resp.NextSequenceToken
}
logQueue = []*cloudwatchlogs.InputLogEvent{}
return false
}
return true
}
func capturePolicyEvents(ringbufferdata <-chan []byte, log logr.Logger, enableCloudWatchLogs bool, enableIPv6 bool) {
nodeName := os.Getenv("MY_NODE_NAME")
// Read from ringbuffer channel, perf buffer support is not there and 5.10 kernel is needed.
go func(ringbufferdata <-chan []byte) {
done := false
for record := range ringbufferdata {
var logQueue []*cloudwatchlogs.InputLogEvent
var message string
if enableIPv6 {
var rb ringBufferDataV6_t
buf := bytes.NewBuffer(record)
if err := binary.Read(buf, binary.LittleEndian, &rb); err != nil {
log.Info("Failed to read from Ring buf", err)
continue
}
protocol := utils.GetProtocol(int(rb.Protocol))
verdict := getVerdict(int(rb.Verdict))
log.Info("Flow Info: ", "Src IP", utils.ConvByteToIPv6(rb.SourceIP).String(), "Src Port", rb.SourcePort,
"Dest IP", utils.ConvByteToIPv6(rb.DestIP).String(), "Dest Port", rb.DestPort,
"Proto", protocol, "Verdict", verdict)
message = "Node: " + nodeName + ";" + "SIP: " + utils.ConvByteToIPv6(rb.SourceIP).String() + ";" + "SPORT: " + strconv.Itoa(int(rb.SourcePort)) + ";" + "DIP: " + utils.ConvByteToIPv6(rb.DestIP).String() + ";" + "DPORT: " + strconv.Itoa(int(rb.DestPort)) + ";" + "PROTOCOL: " + protocol + ";" + "PolicyVerdict: " + verdict
} else {
var rb ringBufferDataV4_t
buf := bytes.NewBuffer(record)
if err := binary.Read(buf, binary.LittleEndian, &rb); err != nil {
log.Info("Failed to read from Ring buf", err)
continue
}
protocol := utils.GetProtocol(int(rb.Protocol))
verdict := getVerdict(int(rb.Verdict))
log.Info("Flow Info: ", "Src IP", utils.ConvByteArrayToIP(rb.SourceIP), "Src Port", rb.SourcePort,
"Dest IP", utils.ConvByteArrayToIP(rb.DestIP), "Dest Port", rb.DestPort,
"Proto", protocol, "Verdict", verdict)
message = "Node: " + nodeName + ";" + "SIP: " + utils.ConvByteArrayToIP(rb.SourceIP) + ";" + "SPORT: " + strconv.Itoa(int(rb.SourcePort)) + ";" + "DIP: " + utils.ConvByteArrayToIP(rb.DestIP) + ";" + "DPORT: " + strconv.Itoa(int(rb.DestPort)) + ";" + "PROTOCOL: " + protocol + ";" + "PolicyVerdict: " + verdict
}
if enableCloudWatchLogs {
done = publishDataToCloudwatch(logQueue, message, log)
if done {
break
}
}
}
}(ringbufferdata)
}
func ensureLogGroupExists(name string) error {
resp, err := cwl.DescribeLogGroups(&cloudwatchlogs.DescribeLogGroupsInput{})
if err != nil {
return err
}
for _, logGroup := range resp.LogGroups {
if *logGroup.LogGroupName == name {
return nil
}
}
_, err = cwl.CreateLogGroup(&cloudwatchlogs.CreateLogGroupInput{
LogGroupName: &name,
})
if err != nil {
if aerr, ok := err.(awserr.Error); ok {
if aerr.Code() == "ResourceAlreadyExistsException" {
return nil
}
}
return err
}
return nil
}
func createLogStream() error {
name := "aws-network-policy-agent-audit-" + uuid.New().String()
_, err := cwl.CreateLogStream(&cloudwatchlogs.CreateLogStreamInput{
LogGroupName: &logGroupName,
LogStreamName: &name,
})
logStreamName = name
return err
}