terraform/builtin/providers/aws/resource_aws_network_acl.go

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package aws
import (
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"bytes"
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"fmt"
"log"
"time"
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"github.com/hashicorp/terraform/helper/hashcode"
"github.com/hashicorp/terraform/helper/resource"
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"github.com/hashicorp/terraform/helper/schema"
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"github.com/mitchellh/goamz/ec2"
)
func resourceAwsNetworkAcl() *schema.Resource {
return &schema.Resource{
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Create: resourceAwsNetworkAclCreate,
Read: resourceAwsNetworkAclRead,
Delete: resourceAwsNetworkAclDelete,
Update: resourceAwsNetworkAclUpdate,
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Schema: map[string]*schema.Schema{
"vpc_id": &schema.Schema{
Type: schema.TypeString,
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Required: true,
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ForceNew: true,
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Computed: false,
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},
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"subnet_id": &schema.Schema{
Type: schema.TypeString,
Optional: true,
ForceNew: true,
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Computed: false,
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},
"ingress": &schema.Schema{
Type: schema.TypeSet,
Required: false,
Optional: true,
Elem: &schema.Resource{
Schema: map[string]*schema.Schema{
"from_port": &schema.Schema{
Type: schema.TypeInt,
Required: true,
},
"to_port": &schema.Schema{
Type: schema.TypeInt,
Required: true,
},
"rule_no": &schema.Schema{
Type: schema.TypeInt,
Required: true,
},
"action": &schema.Schema{
Type: schema.TypeString,
Required: true,
},
"protocol": &schema.Schema{
Type: schema.TypeString,
Required: true,
},
"cidr_block": &schema.Schema{
Type: schema.TypeString,
Optional: true,
},
},
},
Set: resourceAwsNetworkAclEntryHash,
},
"egress": &schema.Schema{
Type: schema.TypeSet,
Required: false,
Optional: true,
Elem: &schema.Resource{
Schema: map[string]*schema.Schema{
"from_port": &schema.Schema{
Type: schema.TypeInt,
Required: true,
},
"to_port": &schema.Schema{
Type: schema.TypeInt,
Required: true,
},
"rule_no": &schema.Schema{
Type: schema.TypeInt,
Required: true,
},
"action": &schema.Schema{
Type: schema.TypeString,
Required: true,
},
"protocol": &schema.Schema{
Type: schema.TypeString,
Required: true,
},
"cidr_block": &schema.Schema{
Type: schema.TypeString,
Optional: true,
},
},
},
Set: resourceAwsNetworkAclEntryHash,
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},
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},
}
}
func resourceAwsNetworkAclCreate(d *schema.ResourceData, meta interface{}) error {
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ec2conn := meta.(*AWSClient).ec2conn
// Create the Network Acl
createOpts := &ec2.CreateNetworkAcl{
VpcId: d.Get("vpc_id").(string),
}
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log.Printf("[DEBUG] Network Acl create config: %#v", createOpts)
resp, err := ec2conn.CreateNetworkAcl(createOpts)
if err != nil {
return fmt.Errorf("Error creating network acl: %s", err)
}
// Get the ID and store it
networkAcl := &resp.NetworkAcl
d.SetId(networkAcl.NetworkAclId)
log.Printf("[INFO] Network Acl ID: %s", networkAcl.NetworkAclId)
// Update rules and subnet association once acl is created
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return resourceAwsNetworkAclUpdate(d, meta)
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}
func resourceAwsNetworkAclRead(d *schema.ResourceData, meta interface{}) error {
ec2conn := meta.(*AWSClient).ec2conn
resp, err := ec2conn.NetworkAcls([]string{d.Id()}, ec2.NewFilter())
if err != nil {
return err
}
if resp == nil {
return nil
}
networkAcl := &resp.NetworkAcls[0]
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var ingressEntries []ec2.NetworkAclEntry
var egressEntries []ec2.NetworkAclEntry
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// separate the ingress and egress rules
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for _, e := range networkAcl.EntrySet {
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if e.Egress == true {
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egressEntries = append(egressEntries, e)
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} else {
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ingressEntries = append(ingressEntries, e)
}
}
d.Set("vpc_id", networkAcl.VpcId)
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d.Set("ingress", ingressEntries)
d.Set("egress", egressEntries)
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return nil
}
func resourceAwsNetworkAclUpdate(d *schema.ResourceData, meta interface{}) error {
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ec2conn := meta.(*AWSClient).ec2conn
d.Partial(true)
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if d.HasChange("ingress") {
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err := updateNetworkAclEntries(d, "ingress", ec2conn)
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if err != nil {
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return err
}
}
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if d.HasChange("egress") {
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err := updateNetworkAclEntries(d, "egress", ec2conn)
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if err != nil {
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return err
}
}
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if d.HasChange("subnet_id") {
//associate new subnet with the acl.
_, n := d.GetChange("subnet_id")
newSubnet := n.(string)
association, err := findNetworkAclAssociation(newSubnet, ec2conn)
if err != nil {
return fmt.Errorf("Failed to update acl %s with subnet %s: ", d.Id(), newSubnet, err)
}
_, err = ec2conn.ReplaceNetworkAclAssociation(association.NetworkAclAssociationId, d.Id())
if err != nil {
return err
}
}
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d.Partial(false)
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return resourceAwsNetworkAclRead(d, meta)
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}
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func updateNetworkAclEntries(d *schema.ResourceData, entryType string, ec2conn *ec2.EC2) error {
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o, n := d.GetChange(entryType)
if o == nil {
o = new(schema.Set)
}
if n == nil {
n = new(schema.Set)
}
os := o.(*schema.Set)
ns := n.(*schema.Set)
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toBeDeleted := expandNetworkAclEntries(os.Difference(ns).List(), entryType)
toBeCreated := expandNetworkAclEntries(ns.Difference(os).List(), entryType)
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for _, remove := range toBeDeleted {
// Delete old Acl
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_, err := ec2conn.DeleteNetworkAclEntry(d.Id(), remove.RuleNumber, remove.Egress)
if err != nil {
return fmt.Errorf("Error deleting %s entry: %s", entryType, err)
}
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}
for _, add := range toBeCreated {
// Add new Acl entry
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_, err := ec2conn.CreateNetworkAclEntry(d.Id(), &add)
if err != nil {
return fmt.Errorf("Error creating %s entry: %s", entryType, err)
}
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}
return nil
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}
func resourceAwsNetworkAclDelete(d *schema.ResourceData, meta interface{}) error {
ec2conn := meta.(*AWSClient).ec2conn
log.Printf("[INFO] Deleting Network Acl: %s", d.Id())
return resource.Retry(5*time.Minute, func() error {
if _, err := ec2conn.DeleteNetworkAcl(d.Id()); err != nil {
ec2err := err.(*ec2.Error)
switch ec2err.Code {
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case "InvalidNetworkAclID.NotFound":
return nil
case "DependencyViolation":
// In case of dependency violation, we remove the association between subnet and network acl.
// This means the subnet is attached to default acl of vpc.
association, err := findNetworkAclAssociation(d.Get("subnet_id").(string), ec2conn)
if err != nil {
return fmt.Errorf("Depedency voilation: Can not delete acl: %s", d.Id(), err)
}
defaultAcl, err := getDefaultNetworkAcl(d.Get("vpc_id").(string), ec2conn)
if err != nil {
return fmt.Errorf("Depedency voilation: Can not delete acl %s", d.Id(), err)
}
_, err = ec2conn.ReplaceNetworkAclAssociation(association.NetworkAclAssociationId, defaultAcl.NetworkAclId)
return resource.RetryError{err}
default:
// Any other error, we want to quit the retry loop immediately
return resource.RetryError{err}
}
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}
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log.Printf("[Info] Deleted network ACL %s successfully", d.Id())
return nil
})
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}
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func resourceAwsNetworkAclEntryHash(v interface{}) int {
var buf bytes.Buffer
m := v.(map[string]interface{})
buf.WriteString(fmt.Sprintf("%d-", m["from_port"].(int)))
buf.WriteString(fmt.Sprintf("%s-", m["to_port"].(int)))
buf.WriteString(fmt.Sprintf("%d-", m["rule_no"].(int)))
buf.WriteString(fmt.Sprintf("%s-", m["action"].(string)))
buf.WriteString(fmt.Sprintf("%s-", m["protocol"].(string)))
buf.WriteString(fmt.Sprintf("%s-", m["cidr_block"].(string)))
if v, ok := m["ssl_certificate_id"]; ok {
buf.WriteString(fmt.Sprintf("%s-", v.(string)))
}
return hashcode.String(buf.String())
}
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func getDefaultNetworkAcl(vpc_id string, ec2conn *ec2.EC2) (defaultAcl *ec2.NetworkAcl, err error) {
filter := ec2.NewFilter()
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filter.Add("default", "true")
filter.Add("vpc-id", vpc_id)
resp, err := ec2conn.NetworkAcls([]string{}, filter)
if err != nil {
return nil, err
}
return &resp.NetworkAcls[0], nil
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}
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func findNetworkAclAssociation(subnetId string, ec2conn *ec2.EC2) (networkAclAssociation *ec2.NetworkAclAssociation, err error) {
filter := ec2.NewFilter()
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filter.Add("association.subnet-id", subnetId)
resp, err := ec2conn.NetworkAcls([]string{}, filter)
if err != nil {
return nil, err
}
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for _, association := range resp.NetworkAcls[0].AssociationSet {
if association.SubnetId == subnetId {
return &association, nil
}
}
return nil, fmt.Errorf("could not find association for subnet %s ", subnetId)
}