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kvmAgent.go
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kvmAgent.go
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// SPDX-License-Identifier: Apache-2.0
// Copyright 2021 Authors of KubeArmor
// Package kvmagent contains utilities to connect to kvmservice to establish support on bare-metal env
package kvmagent
import (
"context"
"encoding/json"
"errors"
"io"
"net"
"os"
"strings"
"time"
kg "github.com/kubearmor/KubeArmor/KubeArmor/log"
tp "github.com/kubearmor/KubeArmor/KubeArmor/types"
pb "github.com/kubearmor/KubeArmor/protobuf"
"google.golang.org/grpc"
"google.golang.org/grpc/metadata"
)
// const variables
const errIdentityRemoved = "err-identity-removed"
// KVMAgent Structure
type KVMAgent struct {
Identity string
gRPCServer string
gRPCConnection *grpc.ClientConn
gRPCClient pb.KVMClient
UpdateHostPolicy func(tp.K8sKubeArmorHostPolicyEvent) pb.PolicyStatus
}
func getgRPCAddress() (string, error) {
serverAddr := net.JoinHostPort(os.Getenv("CLUSTER_IP"), os.Getenv("CLUSTER_PORT"))
if serverAddr == ":" {
return "", errors.New("either CLUSTER_IP or CLUSTER_PORT is not set")
}
return serverAddr, nil
}
// NewKVMAgent Function
func NewKVMAgent(eventCb tp.KubeArmorHostPolicyEventCallback) *KVMAgent {
kvm := &KVMAgent{}
// Get identity
kvm.Identity = os.Getenv("WORKLOAD_IDENTITY")
// Get the address of gRPC server
gRPCServer, err := getgRPCAddress()
if err != nil {
kg.Errf("Failed to get gRPC address", err.Error())
return nil
}
kvm.gRPCServer = gRPCServer
// Connect to gRPC server
ctx, _ := context.WithTimeout(context.Background(), time.Second*5)
gRPCConnection, err := grpc.DialContext(ctx, kvm.gRPCServer, grpc.WithInsecure(), grpc.WithBlock())
if err != nil {
kg.Errf("Not accessible to gRPC server (%s)", err.Error())
return nil
}
kvm.gRPCConnection = gRPCConnection
kvm.gRPCClient = pb.NewKVMClient(gRPCConnection)
// Register identity
response, err := kvm.gRPCClient.RegisterAgentIdentity(context.Background(), &pb.AgentIdentity{Identity: kvm.Identity})
if err != nil || response.Status != 0 {
kg.Errf("Failed to register KVM agent identity (%s)", err.Error())
return nil
}
// Link ParseAndUpdateHostSecurityPolicy()
kvm.UpdateHostPolicy = eventCb
return kvm
}
// DestroyKVMAgent Function
func (kvm *KVMAgent) DestroyKVMAgent() error {
if err := kvm.gRPCConnection.Close(); err != nil {
return err
}
return nil
}
// ConnectToKVMService Function
func (kvm *KVMAgent) ConnectToKVMService() {
for {
md := metadata.New(map[string]string{"identity": kvm.Identity})
ctx := metadata.NewOutgoingContext(context.Background(), md)
stream, err := kvm.gRPCClient.SendPolicy(ctx)
if err != nil {
kg.Warnf("Unable to connect stream (%s)", err.Error())
// close the connection
if err = kvm.gRPCConnection.Close(); err != nil {
kg.Warnf("Unable to close the current connection (%s)", err.Error())
}
// connect to gRPC server again
ctx, _ := context.WithTimeout(context.Background(), time.Second*5)
gRPCConnection, err := grpc.DialContext(ctx, kvm.gRPCServer, grpc.WithInsecure(), grpc.WithBlock())
if err != nil {
kg.Errf("Not accessible to gRPC server (%s)", err.Error())
return
}
// update Connection and Client
kvm.gRPCConnection = gRPCConnection
kvm.gRPCClient = pb.NewKVMClient(gRPCConnection)
continue
}
for {
status := int32(0)
policyEvent := tp.K8sKubeArmorHostPolicyEvent{}
policy, err := stream.Recv()
if err == io.EOF {
continue
} else if err != nil {
if strings.Contains(string(err.Error()), errIdentityRemoved) {
kg.Warn("Identity removed from server")
// close the connection
if err = kvm.gRPCConnection.Close(); err != nil {
kg.Warn("Failed to close the current connection")
}
return
}
// close the connection
if err = kvm.gRPCConnection.Close(); err != nil {
kg.Warnf("Unable to close the current connection (%s)", err.Error())
}
// connect to gRPC server again
ctx, _ := context.WithTimeout(context.Background(), time.Second*5)
gRPCConnection, err := grpc.DialContext(ctx, kvm.gRPCServer, grpc.WithInsecure(), grpc.WithBlock())
if err != nil {
kg.Errf("Not accessible to gRPC server (%s)", err.Error())
return
}
// update Connection and Client
kvm.gRPCConnection = gRPCConnection
kvm.gRPCClient = pb.NewKVMClient(gRPCConnection)
break
}
// get a policy
err = json.Unmarshal(policy.PolicyData, &policyEvent)
if err == nil {
// update the policy
kvm.UpdateHostPolicy(policyEvent)
} else {
kg.Warnf("Unable to load a policy (%s)", err.Error())
status = 1
}
// return the status
if err = stream.Send(&pb.Status{Status: status}); err != nil {
kg.Warnf("Unable to send the status (%s)", err.Error())
}
}
}
}