Using AWS IAM in Go: A Complete Guide

AWS (Amazon Web Services), as the leader in the cloud computing industry, provides convenient and powerful cloud computing services, allowing enterprises to easily build and manage their own IT infrastructure and obtain better scalability, Flexibility and low cost. IAM (Identity and Access Management) is one of the important services in AWS. It is responsible for managing the identity and access rights of users (including people, applications, services, etc.) and ensuring the security and confidentiality of AWS resources. In this article, we will introduce how to use AWS IAM in Go language and provide detailed implementation methods and code examples.

1. Create IAM users and roles in AWS

First, we need to create IAM users and roles in AWS. An IAM user is the identity of AWS resources, and a role is the access permission to these resources. We can create and manage these identities and permissions using the AWS console or AWS CLI. Here are the steps to create IAM users and roles using the AWS console:

1. Log in to the AWS console and go to the IAM console.
2. Click "Users" in the left navigation bar, then click "Add User". Enter your username and access type (Programmatic Access or AWS Management Console Access) and click Next.
3. Assign permissions to new users. We can directly add users to an existing user group (i.e. a set of users associated with the same permissions), or create a custom permissions policy for new users. Here we create a permissions policy called "IAMUserPolicy" for the new user, including access to AmazonS3FullAccess. After adding the permission policy, click "Next".
4. Confirm all settings. In this page we can view the access keys and security credentials of the IAM user we created, as well as the access permissions we just created for that user. After confirming all settings, click "Done".
5. Repeat steps 2-4 above to create an IAM role named "IAMRole" and associate the AmazonS3FullAccess permission policy with the role.

2. Implement AWS IAM in Go language

After creating IAM users and roles, we can start to implement AWS IAM in Go language. The following are the implementation steps using AWS SDK for Go (aws-sdk-go):

1. Install aws-sdk-go:

go get -u github.com/aws/aws-sdk-go

2. In Go code import aws-sdk-go:

import (
    "github.com/aws/aws-sdk-go/aws"
    "github.com/aws/aws-sdk-go/aws/session"
    "github.com/aws/aws-sdk-go/service/iam"
)

3. Configure AWS session:

sess := session.Must(session.NewSessionWithOptions(session.Options{
    SharedConfigState: session.SharedConfigEnable,
}))

This will read the AWS CLI/SDK's shared configuration files, including security Credentials and region information.

4. Create a client for the IAM service:

svc := iam.New(sess)

This creates a client for the IAM service.

5. Create IAM user:

_, err := svc.CreateUser(&iam.CreateUserInput{
    UserName: aws.String("test-user"),
})
if err != nil {
    panic(err)
}

Here we create a new IAM user named "test-user".

6. Assign permissions to IAM users:

_, err = svc.AttachUserPolicy(&iam.AttachUserPolicyInput{
    PolicyArn: aws.String("arn:aws:iam::aws:policy/AmazonS3FullAccess"),
    UserName:  aws.String("test-user"),
})
if err != nil {
    panic(err)
}

Here we associate the IAM user "test-user" with the AmazonS3FullAccess permissions policy.

7. Create IAM role:

_, err = svc.CreateRole(&iam.CreateRoleInput{
    AssumeRolePolicyDocument: aws.String(`{
    "Version": "2012-10-17",
    "Statement": [
      {
        "Effect": "Allow",
        "Principal": {
          "Service": "ec2.amazonaws.com"
        },
        "Action": "sts:AssumeRole"
      }
    ]
}`),
    RoleName: aws.String("test-role"),
})
if err != nil {
    panic(err)
}

Here we have created a new IAM role named "test-role" and associated it with Amazon EC2.

8. Assign permissions to the IAM role:

_, err = svc.AttachRolePolicy(&iam.AttachRolePolicyInput{
    PolicyArn: aws.String("arn:aws:iam::aws:policy/AmazonS3FullAccess"),
    RoleName:  aws.String("test-role"),
})
if err != nil {
    panic(err)
}

Here we associate the IAM role "test-role" with the AmazonS3FullAccess permissions policy.

9. List all IAM users:

resp, err := svc.ListUsers(&iam.ListUsersInput{})
if err != nil {
    panic(err)
}
for _, user := range resp.Users {
    fmt.Println("IAM user:", *user.UserName)
}

Here we list all IAM users.

10. List all IAM roles:

resp, err = svc.ListRoles(&iam.ListRolesInput{})
if err != nil {
    panic(err)
}
for _, role := range resp.Roles {
    fmt.Println("IAM role:", *role.RoleName)
}

Here we list all IAM roles.

3. Conclusion

In this article, we introduced how to create IAM users and roles in AWS, and provided details on using aws-sdk-go to implement AWS IAM in the Go language. Steps and code examples. Through IAM, we can implement reliable authentication and access control to ensure the security and confidentiality of AWS resources. At the same time, using the power of aws-sdk-go, we can implement AWS IAM more easily and build better applications in the Go language.

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