How do I define the principal for an AWS policy statement

0 votes

I started from in order to create a policy that will grant upload rights to a specific S3 bucket for a list of users.
I'm not clear on how I define who those users should be.

The docs refer to a principal as "a person or persons" without an example of how to refer to said person(s). One assumes "email address" and the policy generator will accept it, but when I paste the generated statement to the bucket policy editor, I get:

Invalid principal in policy - "AWS" : ""

Full statement:

  "Id": "myPol",
  "Statement": [
      "Sid": "Stmt130",
      "Action": "s3:*",
      "Effect": "Allow",
      "Resource": "arn:aws:s3:::myBucketName",
      "Principal": {
        "AWS": [
    } ]
Jun 26, 2018 in AWS by Flying geek
• 3,280 points

edited Jun 26, 2018 by Flying geek 961 views

2 answers to this question.

0 votes
Please help me in this  ASAP, anyone?
answered Jun 26, 2018 by Flying geek
• 3,280 points
0 votes

Check with AWS Policy Documentations once, rest you can try this code if it doesn't work then feel free to reach me, cheers:  


public ActionResult Uploaddemo(HttpPostedFileBase file) {
    try {
        IAmazonS3 client;
        using (client = Amazon.AWSClientFactory.CreateAmazonS3Client(_awsAccessKey, _awsSecretKey,RegionEndpoint.USWest2)) {
            var request = new PutObjectRequest() {
                BucketName = _bucketName,
                CannedACL = S3CannedACL.PublicRead, ACCESIBLE
                Key = string.Format("visumes/{0}", file.FileName),
                InputStream = file.InputStream,//SEND THE FILE STREAM

            Amazon.S3.AmazonS3Config s3Config = new Amazon.S3.AmazonS3Config() { 
                ServiceURL = ""  
            string HOST ="";
    } catch (Exception ex) {

    return View();
answered Jun 26, 2018 by Cloud gunner
• 4,670 points

edited Jun 26, 2018 by Cloud gunner

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