Add secret manager replication support (ansible-collections#827)

Add secret manager replication support

Signed-off-by: Eric Millbrandt eric.millbrandt@numerated.com
SUMMARY
Add support for regional secret replication.  The component now supports:

Creating a secret with a regional replica
Adding a region replica to a secret
Removing a region replica from a secret

ISSUE TYPE

Feature Pull Request

COMPONENT NAME
aws_secret
ADDITIONAL INFORMATION
https://aws.amazon.com/about-aws/whats-new/2021/03/aws-secrets-manager-provides-support-to-replicate-secrets-in-aws-secrets-manager-to-multiple-aws-regions/
https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/secretsmanager.html

Reviewed-by: Eric Millbrandt <eric.millbrandt@numerated.com>
Reviewed-by: Markus Bergholz <git@osuv.de>
Reviewed-by: Mark Chappell <None>
Reviewed-by: Alina Buzachis <None>
Reviewed-by: Mark Woolley <mw@marknet15.com>

secretsmanager_secret.py

@@ -41,6 +41,24 @@
     - Specifies a user-provided description of the secret.
     type: str
     default: ''
+  replica:
+    description:
+    - Specifies a list of regions and kms_key_ids (optional) to replicate the secret to
+    type: list
+    elements: dict
+    version_added: 5.3.0
+    suboptions:
+      region:
+        description:
+          - Region to replicate secret to.
+        type: str
+        required: true
+      kms_key_id:
+        description:
+          - Specifies the ARN or alias of the AWS KMS customer master key (CMK) in the
+            destination region to be used (alias/aws/secretsmanager is assumed if not specified)
+        type: str
+        required: false
   kms_key_id:
     description:
     - Specifies the ARN or alias of the AWS KMS customer master key (CMK) to be
@@ -196,10 +214,13 @@
 
 class Secret(object):
     """An object representation of the Secret described by the self.module args"""
-    def __init__(self, name, secret_type, secret, resource_policy=None, description="", kms_key_id=None,
-                 tags=None, lambda_arn=None, rotation_interval=None):
+    def __init__(
+        self, name, secret_type, secret, resource_policy=None, description="", kms_key_id=None,
+        tags=None, lambda_arn=None, rotation_interval=None, replica_regions=None,
+    ):
         self.name = name
         self.description = description
+        self.replica_regions = replica_regions
         self.kms_key_id = kms_key_id
         if secret_type == "binary":
             self.secret_type = "SecretBinary"
@@ -223,6 +244,15 @@ def create_args(self):
             args["Description"] = self.description
         if self.kms_key_id:
             args["KmsKeyId"] = self.kms_key_id
+        if self.replica_regions:
+            add_replica_regions = []
+            for replica in self.replica_regions:
+                if replica["kms_key_id"]:
+                    add_replica_regions.append({'Region': replica["region"],
+                                                'KmsKeyId': replica["kms_key_id"]})
+                else:
+                    add_replica_regions.append({'Region': replica["region"]})
+            args["AddReplicaRegions"] = add_replica_regions
         if self.tags:
             args["Tags"] = ansible_dict_to_boto3_tag_list(self.tags)
         args[self.secret_type] = self.secret
@@ -320,6 +350,35 @@ def put_resource_policy(self, secret):
             self.module.fail_json_aws(e, msg="Failed to update secret resource policy")
         return response
 
+    def remove_replication(self, name, regions):
+        if self.module.check_mode:
+            self.module.exit_json(changed=True)
+        try:
+            replica_regions = []
+            response = self.client.remove_regions_from_replication(
+                SecretId=name,
+                RemoveReplicaRegions=regions)
+        except (BotoCoreError, ClientError) as e:
+            self.module.fail_json_aws(e, msg="Failed to replicate secret")
+        return response
+
+    def replicate_secret(self, name, regions):
+        if self.module.check_mode:
+            self.module.exit_json(changed=True)
+        try:
+            replica_regions = []
+            for replica in regions:
+                if replica["kms_key_id"]:
+                    replica_regions.append({'Region': replica["region"], 'KmsKeyId': replica["kms_key_id"]})
+                else:
+                    replica_regions.append({'Region': replica["region"]})
+            response = self.client.replicate_secret_to_regions(
+                SecretId=name,
+                AddReplicaRegions=replica_regions)
+        except (BotoCoreError, ClientError) as e:
+            self.module.fail_json_aws(e, msg="Failed to replicate secret")
+        return response
+
     def restore_secret(self, name):
         if self.module.check_mode:
             self.module.exit_json(changed=True)
@@ -424,12 +483,49 @@ def rotation_match(desired_secret, current_secret):
     return True
 
 
+def compare_regions(desired_secret, current_secret):
+    """Compare secrets replication configuration
+
+    Args:
+        desired_secret: camel dict representation of the desired secret state.
+        current_secret: secret reference as returned by the secretsmanager api.
+
+    Returns: bool
+    """
+    regions_to_set_replication = []
+    regions_to_remove_replication = []
+
+    if desired_secret.replica_regions is None:
+        return regions_to_set_replication, regions_to_remove_replication
+
+    if desired_secret.replica_regions:
+        regions_to_set_replication = desired_secret.replica_regions
+
+    for current_secret_region in current_secret.get("ReplicationStatus", []):
+        if regions_to_set_replication:
+            for desired_secret_region in regions_to_set_replication:
+                if current_secret_region["Region"] == desired_secret_region["region"]:
+                    regions_to_set_replication.remove(desired_secret_region)
+                else:
+                    regions_to_remove_replication.append(current_secret_region["Region"])
+        else:
+            regions_to_remove_replication.append(current_secret_region["Region"])
+
+    return regions_to_set_replication, regions_to_remove_replication
+
+
 def main():
+    replica_args = dict(
+        region=dict(type='str', required=True),
+        kms_key_id=dict(type='str', required=False),
+    )
+
     module = AnsibleAWSModule(
         argument_spec={
             'name': dict(required=True),
             'state': dict(choices=['present', 'absent'], default='present'),
             'description': dict(default=""),
+            'replica': dict(type='list', elements='dict', options=replica_args),
             'kms_key_id': dict(),
             'secret_type': dict(choices=['binary', 'string'], default="string"),
             'secret': dict(default="", no_log=True),
@@ -454,6 +550,7 @@ def main():
         module.params.get('secret_type'),
         module.params.get('secret') or module.params.get('json_secret'),
         description=module.params.get('description'),
+        replica_regions=module.params.get('replica'),
         kms_key_id=module.params.get('kms_key_id'),
         resource_policy=module.params.get('resource_policy'),
         tags=module.params.get('tags'),
@@ -492,6 +589,7 @@ def main():
             if not rotation_match(secret, current_secret):
                 result = secrets_mgr.update_rotation(secret)
                 changed = True
+
             current_resource_policy_response = secrets_mgr.get_resource_policy(secret.name)
             current_resource_policy = current_resource_policy_response.get("ResourcePolicy")
             if compare_policies(secret.resource_policy, current_resource_policy):
@@ -500,6 +598,7 @@ def main():
                 else:
                     result = secrets_mgr.put_resource_policy(secret)
                 changed = True
+
             if module.params.get('tags') is not None:
                 current_tags = boto3_tag_list_to_ansible_dict(current_secret.get('Tags', []))
                 tags_to_add, tags_to_remove = compare_aws_tags(current_tags, secret.tags, purge_tags)
@@ -509,6 +608,15 @@ def main():
                 if tags_to_remove:
                     secrets_mgr.untag_secret(secret.name, tags_to_remove)
                     changed = True
+
+            regions_to_set_replication, regions_to_remove_replication = compare_regions(secret, current_secret)
+            if regions_to_set_replication:
+                secrets_mgr.replicate_secret(secret.name, regions_to_set_replication)
+                changed = True
+            if regions_to_remove_replication:
+                secrets_mgr.remove_replication(secret.name, regions_to_remove_replication)
+                changed = True
+
         result = camel_dict_to_snake_dict(secrets_mgr.get_secret(secret.name))
         if result.get('tags', None) is not None:
             result['tags_dict'] = boto3_tag_list_to_ansible_dict(result.get('tags', []))