Crate aws-iam

A Rust crate for dealing with AWS IAM Policy resources.

Model

For the most part importing aws_iam::model provides the core types necessary to programmatically create Policy documents. You can also import aws_iam::model::builder to use a more fluent interface to construct Policies. The aws_iam::io module provides simple read and write functions, the write functions producing pretty printed JSON output.

The aws_iam::report module provides a set of traits that allow for visiting a Policy model, and implementations of these that write formatted versions of a Policy as documentation.

Example

use aws_iam::model::*;
use aws_iam::io::write_to_writer;
use std::io::stdout;

let policy: Policy = PolicyBuilder::new()
    .named("confidential-data-access")
    .evaluate_statement(
        StatementBuilder::new()
            .auto_named()
            .allows()
            .unspecified_principals()
            .may_perform_actions(vec!["s3:List*", "s3:Get*"])
            .on_resources(vec![
                "arn:aws:s3:::confidential-data",
                "arn:aws:s3:::confidential-data/*",
            ])
            .if_condition(
                ConditionBuilder::new_bool()
                    .right_hand_bool("aws:MultiFactorAuthPresent", true)
                    .if_exists(),
            ),
    )
    .into();
write_to_writer(stdout(), &policy);

Results in the following JSON.

{
  "Id": "confidential-data-access",
  "Statement": {
    "Sid": "sid_e4d7f2d3-cfed-4346-9c5e-a8e9e38ef44f",
    "Effect": "Allow",
    "Action": [
      "s3:List*",
      "s3:Get*"
    ],
    "Resource": [
      "arn:aws:s3:::confidential-data",
      "arn:aws:s3:::confidential-data/*"
    ],
    "Condition": {
      "BoolIfExists": {
        "aws:MultiFactorAuthPresent": "true"
      }
    }
  }
}

policy Command-Line Tool

The policy tool provides some very basic policy resource operations. The most valuable of these is verify which will read a file, parse it and produce a formatted output. This output can be a documentation form which is useful for describing common policies.

 $ policy -h
policy 0.2.0

USAGE:
    policy [FLAGS] <SUBCOMMAND>

FLAGS:
    -h, --help       Prints help information
    -V, --version    Prints version information
    -v, --verbose    The level of logging to perform, from off to trace

SUBCOMMANDS:
    help      Prints this message or the help of the given subcommand(s)
    new       Create a new default policy document
    verify    Verify an existing policy document

For example, given the following JSON policy:

{
  "Version": "2012-10-17",
  "Statement": [{
    "Sid": "DenyAllUsersNotUsingMFA",
    "Effect": "Deny",
    "NotAction": "iam:*",
    "Resource": "*",
    "Condition": {"BoolIfExists": {"aws:MultiFactorAuthPresent": "false"}}
  }]
}

the command policy verify -f markdown will produce the output between the following lines.

---

Policy

IAM Policy Version: 2012-10-17

Statement

Statement ID: DenyAllUsersNotUsingMFA

DENY IF

• Action NOT = "iam:*"
• Resource = "*"
• Condition IF EXISTS aws:MultiFactorAuthPresent THEN
  • aws:MultiFactorAuthPresent Bool "false"

---

Changes

Version 0.3.0

• Update model API:
  • ...

Version 0.2.2

• Added implementations of common equality, ordering, and hashing traits (See Issue #19).

Version 0.2.1

• Fixing missing_docs warnings.
• Removed any_of(), condition_one(), and one() from builder, replaced with functions on Action, Principal, and Resource.

Version 0.2.0

• First commit to Crates.io.
• Completed markdown support for policy tool verification.
• Completed changes to the model to support NotAction, NotPrincipal, and NotResource.
• Filled obvious gaps in documentation.

Version 0.1.0

• Initial commit stream to Github from private project.
• Goal was to complete the existing model, documentation and add the policy tool.

TODO

1. Add Latex output to policy.