forked from hashicorp/terraform-provider-aws
/
resource_aws_default_network_acl.go
295 lines (267 loc) · 8.1 KB
/
resource_aws_default_network_acl.go
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package aws
import (
"fmt"
"log"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/service/ec2"
"github.com/hashicorp/terraform/helper/schema"
)
// ACL Network ACLs all contain explicit deny-all rules that cannot be
// destroyed or changed by users. This rules are numbered very high to be a
// catch-all.
// See http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/VPC_ACLs.html#default-network-acl
const (
awsDefaultAclRuleNumberIpv4 = 32767
awsDefaultAclRuleNumberIpv6 = 32768
)
func resourceAwsDefaultNetworkAcl() *schema.Resource {
return &schema.Resource{
Create: resourceAwsDefaultNetworkAclCreate,
// We reuse aws_network_acl's read method, the operations are the same
Read: resourceAwsNetworkAclRead,
Delete: resourceAwsDefaultNetworkAclDelete,
Update: resourceAwsDefaultNetworkAclUpdate,
Schema: map[string]*schema.Schema{
"vpc_id": {
Type: schema.TypeString,
Computed: true,
},
"default_network_acl_id": {
Type: schema.TypeString,
Required: true,
ForceNew: true,
Computed: false,
},
// We want explicit management of Subnets here, so we do not allow them to be
// computed. Instead, an empty config will enforce just that; removal of the
// any Subnets that have been assigned to the Default Network ACL. Because we
// can't actually remove them, this will be a continual plan until the
// Subnets are themselves destroyed or reassigned to a different Network
// ACL
"subnet_ids": {
Type: schema.TypeSet,
Optional: true,
Elem: &schema.Schema{Type: schema.TypeString},
Set: schema.HashString,
},
// We want explicit management of Rules here, so we do not allow them to be
// computed. Instead, an empty config will enforce just that; removal of the
// rules
"ingress": {
Type: schema.TypeSet,
Required: false,
Optional: true,
Elem: &schema.Resource{
Schema: map[string]*schema.Schema{
"from_port": {
Type: schema.TypeInt,
Required: true,
},
"to_port": {
Type: schema.TypeInt,
Required: true,
},
"rule_no": {
Type: schema.TypeInt,
Required: true,
},
"action": {
Type: schema.TypeString,
Required: true,
},
"protocol": {
Type: schema.TypeString,
Required: true,
},
"cidr_block": {
Type: schema.TypeString,
Optional: true,
},
"ipv6_cidr_block": {
Type: schema.TypeString,
Optional: true,
},
"icmp_type": {
Type: schema.TypeInt,
Optional: true,
},
"icmp_code": {
Type: schema.TypeInt,
Optional: true,
},
},
},
Set: resourceAwsNetworkAclEntryHash,
},
"egress": {
Type: schema.TypeSet,
Required: false,
Optional: true,
Elem: &schema.Resource{
Schema: map[string]*schema.Schema{
"from_port": {
Type: schema.TypeInt,
Required: true,
},
"to_port": {
Type: schema.TypeInt,
Required: true,
},
"rule_no": {
Type: schema.TypeInt,
Required: true,
},
"action": {
Type: schema.TypeString,
Required: true,
},
"protocol": {
Type: schema.TypeString,
Required: true,
},
"cidr_block": {
Type: schema.TypeString,
Optional: true,
},
"ipv6_cidr_block": {
Type: schema.TypeString,
Optional: true,
},
"icmp_type": {
Type: schema.TypeInt,
Optional: true,
},
"icmp_code": {
Type: schema.TypeInt,
Optional: true,
},
},
},
Set: resourceAwsNetworkAclEntryHash,
},
"tags": tagsSchema(),
},
}
}
func resourceAwsDefaultNetworkAclCreate(d *schema.ResourceData, meta interface{}) error {
d.SetId(d.Get("default_network_acl_id").(string))
// revoke all default and pre-existing rules on the default network acl.
// In the UPDATE method, we'll apply only the rules in the configuration.
log.Printf("[DEBUG] Revoking default ingress and egress rules for Default Network ACL for %s", d.Id())
err := revokeAllNetworkACLEntries(d.Id(), meta)
if err != nil {
return err
}
return resourceAwsDefaultNetworkAclUpdate(d, meta)
}
func resourceAwsDefaultNetworkAclUpdate(d *schema.ResourceData, meta interface{}) error {
conn := meta.(*AWSClient).ec2conn
d.Partial(true)
if d.HasChange("ingress") {
err := updateNetworkAclEntries(d, "ingress", conn)
if err != nil {
return err
}
}
if d.HasChange("egress") {
err := updateNetworkAclEntries(d, "egress", conn)
if err != nil {
return err
}
}
if d.HasChange("subnet_ids") {
o, n := d.GetChange("subnet_ids")
if o == nil {
o = new(schema.Set)
}
if n == nil {
n = new(schema.Set)
}
os := o.(*schema.Set)
ns := n.(*schema.Set)
remove := os.Difference(ns).List()
add := ns.Difference(os).List()
if len(remove) > 0 {
//
// NO-OP
//
// Subnets *must* belong to a Network ACL. Subnets are not "removed" from
// Network ACLs, instead their association is replaced. In a normal
// Network ACL, any removal of a Subnet is done by replacing the
// Subnet/ACL association with an association between the Subnet and the
// Default Network ACL. Because we're managing the default here, we cannot
// do that, so we simply log a NO-OP. In order to remove the Subnet here,
// it must be destroyed, or assigned to different Network ACL. Those
// operations are not handled here
log.Printf("[WARN] Cannot remove subnets from the Default Network ACL. They must be re-assigned or destroyed")
}
if len(add) > 0 {
for _, a := range add {
association, err := findNetworkAclAssociation(a.(string), conn)
if err != nil {
return fmt.Errorf("Failed to find acl association: acl %s with subnet %s: %s", d.Id(), a, err)
}
log.Printf("[DEBUG] Updating Network Association for Default Network ACL (%s) and Subnet (%s)", d.Id(), a.(string))
_, err = conn.ReplaceNetworkAclAssociation(&ec2.ReplaceNetworkAclAssociationInput{
AssociationId: association.NetworkAclAssociationId,
NetworkAclId: aws.String(d.Id()),
})
if err != nil {
return err
}
}
}
}
if err := setTags(conn, d); err != nil {
return err
} else {
d.SetPartial("tags")
}
d.Partial(false)
// Re-use the exiting Network ACL Resources READ method
return resourceAwsNetworkAclRead(d, meta)
}
func resourceAwsDefaultNetworkAclDelete(d *schema.ResourceData, meta interface{}) error {
log.Printf("[WARN] Cannot destroy Default Network ACL. Terraform will remove this resource from the state file, however resources may remain.")
d.SetId("")
return nil
}
// revokeAllNetworkACLEntries revoke all ingress and egress rules that the Default
// Network ACL currently has
func revokeAllNetworkACLEntries(netaclId string, meta interface{}) error {
conn := meta.(*AWSClient).ec2conn
resp, err := conn.DescribeNetworkAcls(&ec2.DescribeNetworkAclsInput{
NetworkAclIds: []*string{aws.String(netaclId)},
})
if err != nil {
log.Printf("[DEBUG] Error looking up Network ACL: %s", err)
return err
}
if resp == nil {
return fmt.Errorf("[ERR] Error looking up Default Network ACL Entries: No results")
}
networkAcl := resp.NetworkAcls[0]
for _, e := range networkAcl.Entries {
// Skip the default rules added by AWS. They can be neither
// configured or deleted by users. See http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/VPC_ACLs.html#default-network-acl
if *e.RuleNumber == awsDefaultAclRuleNumberIpv4 ||
*e.RuleNumber == awsDefaultAclRuleNumberIpv6 {
continue
}
// track if this is an egress or ingress rule, for logging purposes
rt := "ingress"
if *e.Egress == true {
rt = "egress"
}
log.Printf("[DEBUG] Destroying Network ACL (%s) Entry number (%d)", rt, int(*e.RuleNumber))
_, err := conn.DeleteNetworkAclEntry(&ec2.DeleteNetworkAclEntryInput{
NetworkAclId: aws.String(netaclId),
RuleNumber: e.RuleNumber,
Egress: e.Egress,
})
if err != nil {
return fmt.Errorf("Error deleting entry (%s): %s", e, err)
}
}
return nil
}