Setting Up Secure File Transfer Protocol (SFTP) for AWS Transfer

In this solution, we will set up a Secure File Transfer Protocol (SFTP) server using AWS Transfer Family with Pulumi in TypeScript. AWS Transfer Family is a fully managed service that enables you to transfer files into and out of AWS storage services. The key services involved in this setup are AWS Transfer Family, Amazon S3, and IAM for access control.

Step-by-Step Explanation

Step 1: Create an S3 Bucket

We will start by creating an S3 bucket to store the files transferred via SFTP.

Step 2: Create an IAM Role

Next, we will create an IAM role that grants the AWS Transfer Family service access to the S3 bucket.

Step 3: Create an SFTP Server

We will then create an SFTP server using AWS Transfer Family and configure it to use the IAM role and S3 bucket created in the previous steps.

Step 4: Create a User for the SFTP Server

Finally, we will create a user for the SFTP server and configure the user’s home directory in the S3 bucket.

Key Points

• AWS Transfer Family provides a fully managed SFTP service.
• Amazon S3 is used as the storage backend for the SFTP server.
• IAM roles are used to grant the necessary permissions to the AWS Transfer Family service.
• Pulumi allows us to define and manage these resources using TypeScript.

Conclusion

By following these steps, we have successfully set up a secure SFTP server using AWS Transfer Family with Pulumi in TypeScript. This setup leverages the scalability and security of AWS services to provide a robust file transfer solution.

Full Code Example

import * as pulumi from "@pulumi/pulumi";
import * as aws from "@pulumi/aws";

// Step 1: Create an S3 Bucket
const s3Bucket = new aws.s3.Bucket("sftpBucket", {
    bucket: "my-sftp-bucket",
});

// Step 2: Create an IAM Role
const sftpRole = new aws.iam.Role("sftpRole", {
    assumeRolePolicy: JSON.stringify({
        Version: "2012-10-17",
        Statement: [
            {
                Action: "sts:AssumeRole",
                Principal: {
                    Service: "transfer.amazonaws.com",
                },
                Effect: "Allow",
                Sid: ""
            }
        ]
    }),
});

const sftpRolePolicy = new aws.iam.RolePolicy("sftpRolePolicy", {
    role: sftpRole.id,
    policy: s3Bucket.arn.apply(arn => JSON.stringify({
        Version: "2012-10-17",
        Statement: [
            {
                Effect: "Allow",
                Action: [
                    "s3:ListBucket",
                    "s3:GetBucketLocation"
                ],
                Resource: [arn]
            },
            {
                Effect: "Allow",
                Action: [
                    "s3:PutObject",
                    "s3:GetObject",
                    "s3:DeleteObject"
                ],
                Resource: [`${arn}/*`]
            }
        ]
    }))
});

// Step 3: Create an SFTP Server
const sftpServer = new aws.transfer.Server("sftpServer", {
    endpointType: "PUBLIC",
    identityProviderType: "SERVICE_MANAGED",
    loggingRole: sftpRole.arn,
    protocols: ["SFTP"],
});

// Step 4: Create a User for the SFTP Server
const sftpUser = new aws.transfer.User("sftpUser", {
    serverId: sftpServer.id,
    userName: "sftpUser",
    role: sftpRole.arn,
    homeDirectory: `/${s3Bucket.bucket}`,
});

export const bucketName = s3Bucket.bucket;
export const roleArn = sftpRole.arn;
export const serverId = sftpServer.id;
export const userName = sftpUser.userName;