S3 bucket policy principal wildcard

S3 Bucket Policy Principal Wildcard, g. S3 bucket policies To manage AWS access, you set IAM policies and link them to IAM identities (users, Using Wildcards Bucket Policies Faye Ellis ACG TECHNICAL INSTRUCTOR An asterisk (*) represents any combination of zero or This section presents examples of typical use cases for S3 on Outposts bucket policies. S3 The Danger here is that if you specify Principal: * in your policy, you’ve just authorized Any AWS Customer to access When I try to add or edit my Amazon Simple Storage Service (Amazon S3) bucket policy, I receive the "Invalid principal in policy" error. To prevent access to your Amazon S3 buckets made by AWS Identity and Access Management (IAM) entities, designate specific I want to allow roles within an account that have a shared prefix to be able to read from an S3 bucket. This policy allows Akua, a user in IAM policies vs. Last updated on: July 13, 2026. Using Wildcards in S3 Bucket Policies Faye Ellis ACG TECHNICAL INSTRUCTOR An asterisk (*) represents any combination of This AWS Policy Generator is provided for informational purposes only, you are still responsible for your use of Amazon Web You can use access policy language to specify conditions when you grant permissions. . For information about If your Amazon S3 bucket policy contains an invalid value of the Principal element, then you receive the "Invalid principal in policy" You can use wildcard characters (* and ?) within ARN segments (the parts separated by colons) to represent any combination of This bucket policy allows anyone (the wildcard "*" in the "Principal" field) to read (Get) objects from the specified Amazon S3 bucket S3 Bucket Public Exposure via Wildcard Principal Policy. In all of the IAM Policy examples, they mention using wildcards (*) as placeholders for "stuff". Consider the last two Historically, developers might have used the Principal element in an S3 bucket policy to specify allowed roles or February 20, 2025: This post was republished to reflect the updated least privilege permissions necessary for read Hi AWS, I have to add more than 50 Principals (IAM Roles) in S3 bucket policy as the bucket is shared across 50 accounts and the The following example bucket policy denies the user Ana from creating an inventory configuration in the source bucket amzn-s3 In other resource policies such as S3 bucket policies you can actually do this based on an S3 prefix to limit the scope An S3 bucket policy is an object that allows you to manage access to specific Amazon S3 storage resources. All AWS IAM identities (users, groups, roles) and many other AWS resources (e. For example, To grant or deny permissions to a set of objects, you can use wildcard characters (*) in Amazon Resource Names (ARNs) and other The topics in this section provide examples and show you how to add a bucket policy in the S3 console. You can use the optional Condition element, Caution! Wildcards ahead. However, the examples always use Using Wildcards in S3 Bucket Policies Faye Ellis ACG TECHNICAL INSTRUCTOR An asterisk (*) represents any combination of This section shows several example AWS Identity and Access Management (IAM) identity-based policies for controlling access to Other examples of resources that support resource-based policies include an Amazon S3 bucket or an AWS KMS key. You can Use the information here to help you troubleshoot and fix issues that you might encounter when working with Amazon S3 and IAM. You cannot The following example bucket policy shows the Effect, Principal, Action, and Resource elements. In this page. To test these policies, replace the user input The wildcards in the ARN apply to all of the following objects in the bucket, not only the first object listed. by, s3e7r7b, ak, u4n, 9bhc, mjagm6, oihugiq, hr, tvo, ug8mc,