575 lines
16 KiB
Go
575 lines
16 KiB
Go
package aws
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import (
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"bytes"
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"fmt"
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"log"
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"sort"
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"strconv"
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"time"
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"github.com/aws/aws-sdk-go/aws"
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"github.com/aws/aws-sdk-go/aws/awserr"
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"github.com/aws/aws-sdk-go/service/ec2"
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"github.com/hashicorp/terraform/helper/hashcode"
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"github.com/hashicorp/terraform/helper/resource"
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"github.com/hashicorp/terraform/helper/schema"
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)
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func resourceAwsNetworkAcl() *schema.Resource {
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return &schema.Resource{
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Create: resourceAwsNetworkAclCreate,
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Read: resourceAwsNetworkAclRead,
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Delete: resourceAwsNetworkAclDelete,
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Update: resourceAwsNetworkAclUpdate,
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Schema: map[string]*schema.Schema{
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"vpc_id": &schema.Schema{
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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{
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Type: schema.TypeString,
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Optional: true,
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ForceNew: true,
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Computed: false,
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Deprecated: "Attribute subnet_id is deprecated on network_acl resources. Use subnet_ids instead",
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},
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"subnet_ids": &schema.Schema{
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Type: schema.TypeSet,
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Optional: true,
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Computed: true,
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ConflictsWith: []string{"subnet_id"},
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Elem: &schema.Schema{Type: schema.TypeString},
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Set: schema.HashString,
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},
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"ingress": &schema.Schema{
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Type: schema.TypeSet,
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Required: false,
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Optional: true,
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Elem: &schema.Resource{
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Schema: map[string]*schema.Schema{
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"from_port": &schema.Schema{
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Type: schema.TypeInt,
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Required: true,
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},
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"to_port": &schema.Schema{
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Type: schema.TypeInt,
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Required: true,
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},
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"rule_no": &schema.Schema{
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Type: schema.TypeInt,
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Required: true,
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},
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"action": &schema.Schema{
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Type: schema.TypeString,
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Required: true,
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},
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"protocol": &schema.Schema{
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Type: schema.TypeString,
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Required: true,
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},
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"cidr_block": &schema.Schema{
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Type: schema.TypeString,
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Optional: true,
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},
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"icmp_type": &schema.Schema{
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Type: schema.TypeInt,
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Optional: true,
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},
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"icmp_code": &schema.Schema{
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Type: schema.TypeInt,
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Optional: true,
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},
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},
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},
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Set: resourceAwsNetworkAclEntryHash,
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},
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"egress": &schema.Schema{
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Type: schema.TypeSet,
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Required: false,
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Optional: true,
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Elem: &schema.Resource{
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Schema: map[string]*schema.Schema{
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"from_port": &schema.Schema{
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Type: schema.TypeInt,
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Required: true,
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},
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"to_port": &schema.Schema{
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Type: schema.TypeInt,
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Required: true,
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},
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"rule_no": &schema.Schema{
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Type: schema.TypeInt,
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Required: true,
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},
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"action": &schema.Schema{
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Type: schema.TypeString,
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Required: true,
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},
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"protocol": &schema.Schema{
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Type: schema.TypeString,
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Required: true,
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},
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"cidr_block": &schema.Schema{
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Type: schema.TypeString,
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Optional: true,
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},
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"icmp_type": &schema.Schema{
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Type: schema.TypeInt,
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Optional: true,
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},
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"icmp_code": &schema.Schema{
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Type: schema.TypeInt,
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Optional: true,
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},
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},
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},
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Set: resourceAwsNetworkAclEntryHash,
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},
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"tags": tagsSchema(),
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},
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}
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}
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func resourceAwsNetworkAclCreate(d *schema.ResourceData, meta interface{}) error {
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conn := meta.(*AWSClient).ec2conn
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// Create the Network Acl
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createOpts := &ec2.CreateNetworkAclInput{
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VpcId: aws.String(d.Get("vpc_id").(string)),
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}
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log.Printf("[DEBUG] Network Acl create config: %#v", createOpts)
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resp, err := conn.CreateNetworkAcl(createOpts)
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if err != nil {
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return fmt.Errorf("Error creating network acl: %s", err)
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}
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// Get the ID and store it
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networkAcl := resp.NetworkAcl
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d.SetId(*networkAcl.NetworkAclId)
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log.Printf("[INFO] Network Acl ID: %s", *networkAcl.NetworkAclId)
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// Update rules and subnet association once acl is created
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return resourceAwsNetworkAclUpdate(d, meta)
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}
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func resourceAwsNetworkAclRead(d *schema.ResourceData, meta interface{}) error {
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conn := meta.(*AWSClient).ec2conn
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resp, err := conn.DescribeNetworkAcls(&ec2.DescribeNetworkAclsInput{
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NetworkAclIds: []*string{aws.String(d.Id())},
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})
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if err != nil {
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return err
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}
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if resp == nil {
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return nil
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}
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networkAcl := resp.NetworkAcls[0]
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var ingressEntries []*ec2.NetworkAclEntry
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var egressEntries []*ec2.NetworkAclEntry
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// separate the ingress and egress rules
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for _, e := range networkAcl.Entries {
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// Skip the default rules added by AWS. They can be neither
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// configured or deleted by users.
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if *e.RuleNumber == 32767 {
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continue
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}
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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)
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}
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}
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d.Set("vpc_id", networkAcl.VpcId)
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d.Set("tags", tagsToMap(networkAcl.Tags))
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var s []string
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for _, a := range networkAcl.Associations {
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s = append(s, *a.SubnetId)
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}
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sort.Strings(s)
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if err := d.Set("subnet_ids", s); err != nil {
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return err
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}
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if err := d.Set("ingress", networkAclEntriesToMapList(ingressEntries)); err != nil {
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return err
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}
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if err := d.Set("egress", networkAclEntriesToMapList(egressEntries)); err != nil {
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return err
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}
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return nil
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}
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func resourceAwsNetworkAclUpdate(d *schema.ResourceData, meta interface{}) error {
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conn := meta.(*AWSClient).ec2conn
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d.Partial(true)
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if d.HasChange("ingress") {
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err := updateNetworkAclEntries(d, "ingress", conn)
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if err != nil {
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return err
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}
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}
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if d.HasChange("egress") {
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err := updateNetworkAclEntries(d, "egress", conn)
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if err != nil {
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return err
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}
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}
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if d.HasChange("subnet_id") {
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//associate new subnet with the acl.
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_, n := d.GetChange("subnet_id")
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newSubnet := n.(string)
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association, err := findNetworkAclAssociation(newSubnet, conn)
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if err != nil {
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return fmt.Errorf("Failed to update acl %s with subnet %s: %s", d.Id(), newSubnet, err)
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}
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_, err = conn.ReplaceNetworkAclAssociation(&ec2.ReplaceNetworkAclAssociationInput{
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AssociationId: association.NetworkAclAssociationId,
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NetworkAclId: aws.String(d.Id()),
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})
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if err != nil {
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return err
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}
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}
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if d.HasChange("subnet_ids") {
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o, n := d.GetChange("subnet_ids")
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if o == nil {
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o = new(schema.Set)
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}
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if n == nil {
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n = new(schema.Set)
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}
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os := o.(*schema.Set)
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ns := n.(*schema.Set)
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remove := os.Difference(ns).List()
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add := ns.Difference(os).List()
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if len(remove) > 0 {
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// A Network ACL is required for each subnet. In order to disassociate a
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// subnet from this ACL, we must associate it with the default ACL.
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defaultAcl, err := getDefaultNetworkAcl(d.Get("vpc_id").(string), conn)
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if err != nil {
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return fmt.Errorf("Failed to find Default ACL for VPC %s", d.Get("vpc_id").(string))
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}
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for _, r := range remove {
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association, err := findNetworkAclAssociation(r.(string), conn)
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if err != nil {
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return fmt.Errorf("Failed to find acl association: acl %s with subnet %s: %s", d.Id(), r, err)
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}
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_, err = conn.ReplaceNetworkAclAssociation(&ec2.ReplaceNetworkAclAssociationInput{
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AssociationId: association.NetworkAclAssociationId,
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NetworkAclId: defaultAcl.NetworkAclId,
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})
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if err != nil {
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return err
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}
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}
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}
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if len(add) > 0 {
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for _, a := range add {
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association, err := findNetworkAclAssociation(a.(string), conn)
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if err != nil {
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return fmt.Errorf("Failed to find acl association: acl %s with subnet %s: %s", d.Id(), a, err)
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}
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_, err = conn.ReplaceNetworkAclAssociation(&ec2.ReplaceNetworkAclAssociationInput{
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AssociationId: association.NetworkAclAssociationId,
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NetworkAclId: aws.String(d.Id()),
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})
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if err != nil {
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return err
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}
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}
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}
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}
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if err := setTags(conn, d); err != nil {
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return err
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} else {
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d.SetPartial("tags")
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}
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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, conn *ec2.EC2) error {
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o, n := d.GetChange(entryType)
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if o == nil {
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o = new(schema.Set)
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}
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if n == nil {
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n = new(schema.Set)
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}
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os := o.(*schema.Set)
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ns := n.(*schema.Set)
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toBeDeleted, err := expandNetworkAclEntries(os.Difference(ns).List(), entryType)
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if err != nil {
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return err
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}
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for _, remove := range toBeDeleted {
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// AWS includes default rules with all network ACLs that can be
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// neither modified nor destroyed. They have a custom rule
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// number that is out of bounds for any other rule. If we
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// encounter it, just continue. There's no work to be done.
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if *remove.RuleNumber == 32767 {
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continue
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}
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// Delete old Acl
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_, err := conn.DeleteNetworkAclEntry(&ec2.DeleteNetworkAclEntryInput{
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NetworkAclId: aws.String(d.Id()),
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RuleNumber: remove.RuleNumber,
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Egress: remove.Egress,
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})
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if err != nil {
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return fmt.Errorf("Error deleting %s entry: %s", entryType, err)
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}
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}
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toBeCreated, err := expandNetworkAclEntries(ns.Difference(os).List(), entryType)
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if err != nil {
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return err
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}
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for _, add := range toBeCreated {
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// Protocol -1 rules don't store ports in AWS. Thus, they'll always
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// hash differently when being read out of the API. Force the user
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// to set from_port and to_port to 0 for these rules, to keep the
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// hashing consistent.
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if *add.Protocol == "-1" {
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to := *add.PortRange.To
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from := *add.PortRange.From
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expected := &expectedPortPair{
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to_port: 0,
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from_port: 0,
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}
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if ok := validatePorts(to, from, *expected); !ok {
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return fmt.Errorf(
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"to_port (%d) and from_port (%d) must both be 0 to use the the 'all' \"-1\" protocol!",
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to, from)
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}
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}
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// AWS mutates the CIDR block into a network implied by the IP and
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// mask provided. This results in hashing inconsistencies between
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// the local config file and the state returned by the API. Error
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// if the user provides a CIDR block with an inappropriate mask
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if err := validateCIDRBlock(*add.CidrBlock); err != nil {
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return err
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}
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// Add new Acl entry
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_, connErr := conn.CreateNetworkAclEntry(&ec2.CreateNetworkAclEntryInput{
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NetworkAclId: aws.String(d.Id()),
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CidrBlock: add.CidrBlock,
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Egress: add.Egress,
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PortRange: add.PortRange,
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Protocol: add.Protocol,
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RuleAction: add.RuleAction,
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RuleNumber: add.RuleNumber,
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IcmpTypeCode: add.IcmpTypeCode,
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})
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if connErr != nil {
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return fmt.Errorf("Error creating %s entry: %s", entryType, connErr)
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}
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}
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return nil
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}
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func resourceAwsNetworkAclDelete(d *schema.ResourceData, meta interface{}) error {
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conn := meta.(*AWSClient).ec2conn
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log.Printf("[INFO] Deleting Network Acl: %s", d.Id())
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return resource.Retry(5*time.Minute, func() error {
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_, err := conn.DeleteNetworkAcl(&ec2.DeleteNetworkAclInput{
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NetworkAclId: aws.String(d.Id()),
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})
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if err != nil {
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ec2err := err.(awserr.Error)
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switch ec2err.Code() {
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case "InvalidNetworkAclID.NotFound":
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return nil
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case "DependencyViolation":
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// In case of dependency violation, we remove the association between subnet and network acl.
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// This means the subnet is attached to default acl of vpc.
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var associations []*ec2.NetworkAclAssociation
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if v, ok := d.GetOk("subnet_id"); ok {
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a, err := findNetworkAclAssociation(v.(string), conn)
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if err != nil {
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return resource.RetryError{Err: fmt.Errorf("Dependency violation: Cannot find ACL %s: %s", d.Id(), err)}
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}
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associations = append(associations, a)
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} else if v, ok := d.GetOk("subnet_ids"); ok {
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ids := v.(*schema.Set).List()
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for _, i := range ids {
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a, err := findNetworkAclAssociation(i.(string), conn)
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if err != nil {
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return resource.RetryError{Err: fmt.Errorf("Dependency violation: Cannot delete acl %s: %s", d.Id(), err)}
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}
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associations = append(associations, a)
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}
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}
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defaultAcl, err := getDefaultNetworkAcl(d.Get("vpc_id").(string), conn)
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if err != nil {
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return resource.RetryError{Err: fmt.Errorf("Dependency violation: Cannot delete acl %s: %s", d.Id(), err)}
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}
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for _, a := range associations {
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_, err = conn.ReplaceNetworkAclAssociation(&ec2.ReplaceNetworkAclAssociationInput{
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AssociationId: a.NetworkAclAssociationId,
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NetworkAclId: defaultAcl.NetworkAclId,
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})
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}
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return resource.RetryError{Err: err}
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default:
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// Any other error, we want to quit the retry loop immediately
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return resource.RetryError{Err: err}
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}
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}
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log.Printf("[Info] Deleted network ACL %s successfully", d.Id())
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return nil
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})
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}
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func resourceAwsNetworkAclEntryHash(v interface{}) int {
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var buf bytes.Buffer
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m := v.(map[string]interface{})
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buf.WriteString(fmt.Sprintf("%d-", m["from_port"].(int)))
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buf.WriteString(fmt.Sprintf("%d-", m["to_port"].(int)))
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buf.WriteString(fmt.Sprintf("%d-", m["rule_no"].(int)))
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buf.WriteString(fmt.Sprintf("%s-", m["action"].(string)))
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// The AWS network ACL API only speaks protocol numbers, and that's
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// all we store. Never hash a protocol name.
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protocol := m["protocol"].(string)
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if _, err := strconv.Atoi(m["protocol"].(string)); err != nil {
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// We're a protocol name. Look up the number.
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buf.WriteString(fmt.Sprintf("%d-", protocolIntegers()[protocol]))
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} else {
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// We're a protocol number. Pass the value through.
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buf.WriteString(fmt.Sprintf("%s-", protocol))
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}
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buf.WriteString(fmt.Sprintf("%s-", m["cidr_block"].(string)))
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if v, ok := m["ssl_certificate_id"]; ok {
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buf.WriteString(fmt.Sprintf("%s-", v.(string)))
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}
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if v, ok := m["icmp_type"]; ok {
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buf.WriteString(fmt.Sprintf("%d-", v.(int)))
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}
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if v, ok := m["icmp_code"]; ok {
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buf.WriteString(fmt.Sprintf("%d-", v.(int)))
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}
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return hashcode.String(buf.String())
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}
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func getDefaultNetworkAcl(vpc_id string, conn *ec2.EC2) (defaultAcl *ec2.NetworkAcl, err error) {
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resp, err := conn.DescribeNetworkAcls(&ec2.DescribeNetworkAclsInput{
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Filters: []*ec2.Filter{
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&ec2.Filter{
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Name: aws.String("default"),
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Values: []*string{aws.String("true")},
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},
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&ec2.Filter{
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Name: aws.String("vpc-id"),
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Values: []*string{aws.String(vpc_id)},
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},
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},
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})
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if err != nil {
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return nil, err
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}
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return resp.NetworkAcls[0], nil
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}
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func findNetworkAclAssociation(subnetId string, conn *ec2.EC2) (networkAclAssociation *ec2.NetworkAclAssociation, err error) {
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resp, err := conn.DescribeNetworkAcls(&ec2.DescribeNetworkAclsInput{
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Filters: []*ec2.Filter{
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&ec2.Filter{
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Name: aws.String("association.subnet-id"),
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Values: []*string{aws.String(subnetId)},
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},
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},
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})
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if err != nil {
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return nil, err
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}
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if resp.NetworkAcls != nil && len(resp.NetworkAcls) > 0 {
|
|
for _, association := range resp.NetworkAcls[0].Associations {
|
|
if *association.SubnetId == subnetId {
|
|
return association, nil
|
|
}
|
|
}
|
|
}
|
|
return nil, fmt.Errorf("could not find association for subnet: %s ", subnetId)
|
|
}
|
|
|
|
// networkAclEntriesToMapList turns ingress/egress rules read from AWS into a list
|
|
// of maps.
|
|
func networkAclEntriesToMapList(networkAcls []*ec2.NetworkAclEntry) []map[string]interface{} {
|
|
result := make([]map[string]interface{}, 0, len(networkAcls))
|
|
for _, entry := range networkAcls {
|
|
acl := make(map[string]interface{})
|
|
acl["rule_no"] = *entry.RuleNumber
|
|
acl["action"] = *entry.RuleAction
|
|
acl["cidr_block"] = *entry.CidrBlock
|
|
|
|
// The AWS network ACL API only speaks protocol numbers, and
|
|
// that's all we record.
|
|
if _, err := strconv.Atoi(*entry.Protocol); err != nil {
|
|
// We're a protocol name. Look up the number.
|
|
acl["protocol"] = protocolIntegers()[*entry.Protocol]
|
|
} else {
|
|
// We're a protocol number. Pass through.
|
|
acl["protocol"] = *entry.Protocol
|
|
}
|
|
|
|
acl["protocol"] = *entry.Protocol
|
|
if entry.PortRange != nil {
|
|
acl["from_port"] = *entry.PortRange.From
|
|
acl["to_port"] = *entry.PortRange.To
|
|
}
|
|
|
|
if entry.IcmpTypeCode != nil {
|
|
acl["icmp_type"] = *entry.IcmpTypeCode.Type
|
|
acl["icmp_code"] = *entry.IcmpTypeCode.Code
|
|
}
|
|
|
|
result = append(result, acl)
|
|
}
|
|
|
|
return result
|
|
}
|