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I have created a policy that will grant upload permissions to a certain S3 bucket for a list of users. I started at

How can I define the users? I referred to docs it states ‘ a person or persons’ but unclear about how to refer to a person(s). Another assumes ‘email address’ where the policy generator will accept that and then I have pasted the generated statement to the bucket policy editor but I’m getting " Invalid principal in policy - "AWS": "[email protected]" ".

Here is the full statement:


  "Id": "myPol",

  "Statement": [


      "Sid": "Stmt130",

      "Action": "s3:*",

      "Effect": "Allow",

      "Resource": "arn:aws:s3:::myBucketName",

      "Principal": {

        "AWS": [

          "[email protected]"



    } ]


Please suggest me any solution. 

1 Answer

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by (2.6k points)
edited by

Kindly once again refer the AWS s3 Policy Document and try the following code:


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();


Hope this helps. 

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