---
name: "VM::EC2::Security::Policy"
section: "3pm"
platform: "linux"
package: "libvm-ec2-perl"
version: "1.28-5"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/VM::EC2::Security::Policy"
---

# VM::EC2::Security::Policy(3pm)

## NAME

VM::EC2::Security::Policy -- Simple IAM policy generator for EC2

## SYNOPSIS

```
 my $policy = VM::EC2::Security::Policy->new;
 $policy->allow('Describe*','CreateVolume','delete_volume');
 $policy->deny('DescribeVolumes');
 print $policy->as_string;
```

## DESCRIPTION

This is a very simple Identity and Access Management (IAM) policy statement generator that works sufficiently well to create policies to control access EC2 resources. It is not fully general across all AWS services.

## METHODS

This section describes the methods available to VM::EC2::Security::Policy. You will create a new, empty, policy using **new()**, grant access to EC2 actions using **allow()**, and deny access to EC2 actions using **deny()**. When you are done, either call **as\_string()**, or just use the policy object in a string context, to get a properly-formatted policy string.

**allow()** and **deny()** return the modified object, allowing you to chain methods. For example:

```
 my $p = VM::EC2::Security::Policy->new
             ->allow('Describe*')
             ->deny('DescribeImages','DescribeInstances');
 print $p;
```

### $policy = VM::EC2::Security::Policy-\>new()

This class method creates a new, empty policy object. The default policy object denies all access to EC2 resources.

### $policy-\>allow('action1','action2','action3',...)

Grant access to the listed EC2 actions. You may specify actions using Amazon's MixedCase notation (e.g. "DescribeInstances"), or using VM::EC2's more Perlish underscore notation (e.g. "describe\_instances"). You can find the list of actions in VM::EC2, or in the Amazon API documentation at http://docs.amazonwebservices.com/AWSEC2/latest/APIReference/OperationList-query.html.

The "\*" wildcard allows you to indicate a series of matching operations. For example, to allow all Describe operations:

```
 $policy->allow('Describe*')
```

As described earlier, **allow()** returns the object, making it easy to chain methods.

### $policy-\>deny('action1','action2','action3',...)

Similar to **allow()**, but in this case denies access to certain actions. Deny statements take precedence over allow statements.

As described earlier, **deny()** returns the object, making it easy to chain methods.

### $string = $policy-\>as\_string

Converts the policy into a JSON string that can be passed to VM::EC2-\>**get\_federation\_token()**, or other AWS libraries.

## STRING OVERLOADING

When used in a string context, this object will interpolate into the policy JSON string using **as\_string()**.

## SEE ALSO

VM::EC2 VM::EC2::Generic

## AUTHOR

Lincoln Stein \<lincoln.stein@gmail.com\>.

Copyright (c) 2011 Ontario Institute for Cancer Research

This package and its accompanying libraries is free software; you can redistribute it and/or modify it under the terms of the GPL (either version 1, or at your option, any later version) or the Artistic License 2.0.  Refer to LICENSE for the full license text. In addition, please see DISCLAIMER.txt for disclaimers of warranty.