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security-groups.go
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security-groups.go
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package mng
import (
"fmt"
"strings"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/awserr"
"github.com/aws/aws-sdk-go/service/ec2"
"go.uber.org/zap"
)
/*
// 'SourceSecurityGroups' does not open to '0.0.0.0/0'
RemoteAccess:
Ec2SshKey: !Ref RemoteAccessKeyName
SourceSecurityGroups:
- !Ref ManagedNodeGroupSecurityGroup
*/
/*
// Not supported yet
// Fn::GetAtt: Resource type AWS::EKS::Nodegroup does not support attribute {Resources.RemoteAccessSecurityGroup}
SecurityGroupIngress22:
Type: AWS::EC2::SecurityGroupIngress
Properties:
GroupId: !GetAtt ManagedNodeGroup.Resources.RemoteAccessSecurityGroup
IpProtocol: 'tcp'
FromPort: '22'
ToPort: '22'
CidrIp: '0.0.0.0/0'
SecurityGroupIngress1024:
Type: AWS::EC2::SecurityGroupIngress
Properties:
GroupId: !GetAtt ManagedNodeGroup.Resources.RemoteAccessSecurityGroup
IpProtocol: 'tcp'
FromPort: '1'
ToPort: '1024'
CidrIp: '0.0.0.0/0'
SecurityGroupEgress1024:
Type: AWS::EC2::SecurityGroupIngress
Properties:
GroupId: !Ref ControlPlaneSecurityGroupID
IpProtocol: 'tcp'
FromPort: '1'
ToPort: '1024'
CidrIp: '0.0.0.0/0'
Outputs:
ManagedNodeGroupRemoteAccessSecurityGroupID:
Description: Security group ID for the node group SSH
Value: !GetAtt ManagedNodeGroup.Resources.RemoteAccessSecurityGroup
*/
func (ts *tester) openPorts(name string) error {
sv, ok := ts.cfg.EKSConfig.AddOnManagedNodeGroups.MNGs[name]
if !ok {
return fmt.Errorf("Managed Node Group %q not found", name)
}
sgID := sv.RemoteAccessSecurityGroupID
ts.cfg.Logger.Info("opening ports", zap.String("name", name), zap.String("security-group-id", sgID))
sout, err := ts.cfg.EC2API.DescribeSecurityGroups(&ec2.DescribeSecurityGroupsInput{
GroupIds: aws.StringSlice([]string{sgID}),
})
if err != nil {
return err
}
if len(sout.SecurityGroups) != 1 {
return fmt.Errorf("expected 1 security group, got %+v", sout.SecurityGroups)
}
foundSSHAccess := false
sg := sout.SecurityGroups[0]
for _, perm := range sg.IpPermissions {
if perm.FromPort == nil || perm.ToPort == nil {
ts.cfg.Logger.Info(
"found security IP permission",
zap.String("security-group-id", sgID),
zap.String("permission", fmt.Sprintf("%+v", perm)),
)
continue
}
fromPort, toPort := *perm.FromPort, *perm.ToPort
rg := ""
if len(perm.IpRanges) == 1 {
rg = *perm.IpRanges[0].CidrIp
}
ts.cfg.Logger.Info(
"found security IP permission",
zap.String("security-group-id", sgID),
zap.Int64("from-port", fromPort),
zap.Int64("to-port", toPort),
zap.String("cidr-ip", rg),
)
if fromPort == 22 && toPort == 22 && rg == "0.0.0.0/0" {
foundSSHAccess = true
break
}
}
if !foundSSHAccess {
ts.cfg.Logger.Warn("authorizing SSH access",
zap.String("name", name),
zap.String("security-group-id", sgID),
zap.Int64("port", 22),
)
_, aerr := ts.cfg.EC2API.AuthorizeSecurityGroupIngress(&ec2.AuthorizeSecurityGroupIngressInput{
GroupId: aws.String(sgID),
IpProtocol: aws.String("tcp"),
FromPort: aws.Int64(22),
ToPort: aws.Int64(22),
CidrIp: aws.String("0.0.0.0/0"),
})
if aerr != nil {
return aerr
}
ts.cfg.Logger.Info("authorized SSH access ingress",
zap.String("security-group-id", sgID),
zap.Int64("port", 22),
)
}
ts.cfg.Logger.Info("authorizing worker node privileged port 'ingress' access for control plane",
zap.String("security-group-id", sgID),
zap.String("port-range", "1-1024"),
)
_, err = ts.cfg.EC2API.AuthorizeSecurityGroupIngress(&ec2.AuthorizeSecurityGroupIngressInput{
GroupId: aws.String(sgID),
IpProtocol: aws.String("tcp"),
FromPort: aws.Int64(1),
ToPort: aws.Int64(1024),
CidrIp: aws.String("0.0.0.0/0"),
})
if err != nil {
// security group may be shared between node groups
skip := false
if ev, ok := err.(awserr.Error); ok {
if ev.Code() == "InvalidPermission.Duplicate" && strings.Contains(ev.Message(), "already exists") {
skip = true
}
}
if !skip {
return err
}
}
ts.cfg.Logger.Info("authorizing worker node privileged port 'egress' access for control plane",
zap.String("security-group-id", sgID),
zap.String("port-range", "1-1024"),
)
_, err = ts.cfg.EC2API.AuthorizeSecurityGroupEgress(&ec2.AuthorizeSecurityGroupEgressInput{
GroupId: aws.String(ts.cfg.EKSConfig.Parameters.ControlPlaneSecurityGroupID),
IpPermissions: []*ec2.IpPermission{
{
IpProtocol: aws.String("tcp"),
FromPort: aws.Int64(1),
ToPort: aws.Int64(1024),
IpRanges: []*ec2.IpRange{
{CidrIp: aws.String("0.0.0.0/0")},
},
},
},
})
if err != nil {
// security group may be shared between node groups
skip := false
if ev, ok := err.(awserr.Error); ok {
if ev.Code() == "InvalidPermission.Duplicate" && strings.Contains(ev.Message(), "already exists") {
skip = true
}
}
if !skip {
return err
}
}
return ts.cfg.EKSConfig.Sync()
}