Amazon S3 download authentication -


i have created bucket in amazon s3 , have uploaded 2 files in , made them public. have links through can access them anywhere on internet. want put restriction on can download files. can please me that. did try documentation, got confused.

i want @ time of download using public link should ask credentials or authenticate user @ time. possible?

by default, objects in amazon s3 private. can add permissions people can access objects. can done via:

  • access control list permissions on individual objects
  • a bucket policy
  • iam users , groups
  • a pre-signed url

as long @ least 1 of these methods granting access, users able access objects amazon s3.

1. access control list on individual objects

the make public option in amazon s3 management console grant open/download permissions internet users. can used grant public access specific objects.

2. bucket policy

a bucket policy can used grant access whole bucket or portion of bucket. can used specify limits access. example, policy make specific directory within bucket public users specific range of ip addresses, during particular times of day, , when accessing bucket via ssl.

a bucket policy way grant public access many objects (eg particular directory) within having specify permissions on each individual object. commonly used static websites served out of s3 bucket.

3. iam users , groups

this similar defining bucket policy, permissions assigned specific users or groups of users. thus, users have permission access objects. users must authenticate when accessing objects, commonly used when accessing objects via aws api, such using aws s3 commands aws command-line interface (cli).

rather being prompted authenticate, users must provide authentication when making api call. simple way of doing store user credentials in local configuration file, cli automatically use when calling s3 api.

4. pre-signed url

a pre-signed url can used grant access s3 objects way of "overriding" access controls. private object can accessed via url appending expiry time , signature. great way serve private content without requiring web server.

typically, pre-signed url constructed application when wishes grant access object. example, let's have photo-sharing website , user has authenticated website. wish display pictures in web page. pictures private, application can generate pre-signed urls grant them temporary access pictures. pre-signed url expire after particular date/time.


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