I have created one GCS bucket in my GCP project where i will save some html files. Users will access that html files from browser using object URL.
I want that html url to be accessible from only specific people who belong to my organization. Even if someone from outside hits that URL, data should not be accessible to them.
Whats the way to do that?
In (1) you can find the two available methods for controlling the access to the objects inside your Google Cloud Storage buckets:
-Uniform: You will provide access to different users depending on the IAM roles you grant to them (2). All of the objects inside the same bucket will share the same policy (you can also define a group of objects with the same prefix instead of the whole bucket)
-Fine-grained: Apart from the IAM roles, you can also use Access Control Lists (3) for defining special policies for each object. This way, a user can have access to only some of the objects inside your bucket.
Once you have defined the appropriate policies according to the desired permissions to be granted to each user, you will need to share with them the Authenticated URL of the object and, according to the GCS UI, "Only users granted permission can access the object with this link".
On the contrary, If you would like to make an object publicly available for everyone in the Internet, you can follow (4) in order to create a Public URL for a certain object. This is also depicted in (5):
Most of the operations you perform in Cloud Storage must be
authenticated. The only exceptions are operations on objects that
allow anonymous access. Objects are anonymously accessible if the
allUsers group has READ permission.
Related
I want to give a group of users a download permission to download files from a specific GCP Bucket. I created that group and gave it "Storage Legacy Object Reader" role but still have a 403 error.
What I want is to just allow the company authenticated users to download and not using the allAuthenticatedUsers nor allUsers.
Any thoughts on how to do that.
For specific users to download files from specific GCP bucket, you may want to:
Enable bucket-level access for that specific bucket.
Add the desired role to the bucket.
With regards to IAM roles, I suggest either of the following but will still depend on your needs:
Storage Admin - Grants full control of buckets and objects. When applied to an individual bucket, control applies only to the specified bucket and objects within the bucket.
Storage Object Admin - Grants full control over objects, including listing, creating, viewing, and deleting objects.
I have some sensitive data saved on GCS bucket. Now, the requirement is to generate V4 signed urls of the GCS objects and allow only certain users to download the objects who possesses the url. However, other users should only be able to see that object is present on GCS but should not be allowed to download the same.
For this, we have created a service account which has Storage Admin role (yes, we can further restrict this) and same is used to generate the urls. However, the issue is, any user who is having storage object viewer role, is able to download the object which we do not want. Is there any way we can restrict all other users apart from service account to download the object?
Also, I tried creating a custom role which was given storage.buckets.list and storage.objects.get or storage.objects.list permissions, and then assign that role to the desired users but in both the cases, user was able to download the files. Apart from these 2 permissions, i could not find any other permission which could restrict the download.
The IAM policy applied to your project defines the actions that users can take on all objects or buckets within your project. An IAM policy applied to a single bucket defines the actions that users can take on that specific bucket and objects within it.
1.Create an IAM policy for your buckets that gives one user administrative control of that bucket. Meanwhile, you can add another user to your project-wide IAM policy that gives that user the ability to view objects in any bucket of your project.
2.Go to your bucket and define the members and the assigned roles, which grant members the ability to perform actions in Cloud Storage as well as Google Cloud more generally.
here is the link from GCP docs: https://cloud.google.com/storage/docs/collaboration
How to allow read/write/delete etc, permissions to users in a particular IAM group for a specific Amazon S3 object/file.
If you wish to control access to "millions" of individual files where access is not based upon the path (directory/folder) of the files, then you will need to create your own authentication method.
This can be done by using an Amazon S3 Pre-signed URL. Basically:
Users access your application
When they request access to a secure file (or, for example, when the application generates an HTML page that includes a link to such a file, or even a reference in an Image tag), the application generates a time-limited pre-signed URL
Users can use this link/URL to access the object in Amazon S3
After the expiry period, the URL no longer works
This gives your application full control over whether a user can access an object.
The only alternative if you were to use IAM would be to grant access based upon the path of the object. It is not a good method to assign access to individual objects.
I have created a bucket in Amazon S3 and have uploaded 2 files in it and made them public. I have the links through which I can access them from anywhere on the Internet. I now want to put some restriction on who can download the files. Can someone please help me with that. I did try the documentation, but got confused.
I want that at the time of download using the public link it should ask for some credentials or something to authenticate the user at that time. Is this possible?
By default, all objects in Amazon S3 are private. You can then add permissions so that people can access your objects. This can be done via:
Access Control List permissions on individual objects
A Bucket Policy
IAM Users and Groups
A Pre-Signed URL
As long as at least one of these methods is granting access, your users will be able to access the objects from Amazon S3.
1. Access Control List on individual objects
The Make Public option in the Amazon S3 management console will grant Open/Download permissions to all Internet users. This can be used to grant public access to specific objects.
2. Bucket Policy
A Bucket Policy can be used to grant access to a whole bucket or a portion of a bucket. It can also be used to specify limits to access. For example, a policy could make a specific directory within a bucket public to users from a specific range of IP addresses, during particular times of the day, and only when accessing the bucket via SSL.
A bucket policy is a good way to grant public access to many objects (eg a particular directory) without having to specify permissions on each individual object. This is commonly used for static websites served out of an S3 bucket.
3. IAM Users and Groups
This is similar to defining a Bucket Policy, but permissions are assigned to specific Users or Groups of users. Thus, only those users have permission to access the objects. Users must authenticate themselves when accessing the objects, so this is most commonly used when accessing objects via the AWS API, such as using the aws s3 commands from the AWS Command-Line Interface (CLI).
Rather than being prompted to authenticate, users must provide the authentication when making the API call. A simple way of doing this is to store user credentials in a local configuration file, which the CLI will automatically use when calling the S3 API.
4. Pre-Signed URL
A Pre-Signed URL can be used to grant access to S3 objects as a way of "overriding" access controls. A normally private object can be accessed via a URL by appending an expiry time and signature. This is a great way to serve private content without requiring a web server.
Typically, an application constructs a Pre-Signed URL when it wishes to grant access to an object. For example, let's say you have a photo-sharing website and a user has authenticated to your website. You now wish to display their pictures in a web page. The pictures are normally private, but your application can generate Pre-Signed URLs that grant them temporary access to the pictures. The Pre-Signed URL will expire after a particular date/time.
Regarding the pre-signed URL, the signature is in the request headers, hence it should be within HTTPS/TLS encryption. But do check for yourself.
I work on a SaaS application where Creators can create Groups and invite others to their Group to share files, chat and so on. Only people within specific group should have access to this group's files.
People from other group must not have access to not their group's files.
And of course all files permission should be set to 'Private', i.e. they should not be searchable/visible/accessable by anonymous users of Internet since information in those files is for personal use only.
I am new to Amazon S3 and don't know how to achieve it... Should I create only 1 main bucket? Or create for each group a new Amazon Bucket?
It is not recommended to use AWS Identity and Access Management (IAM) for storing application users. Application users should be maintained in a separate database (or LDAP, Active directory, etc).
Therefore, creating "one bucket per group" is not feasible, since it is not possible to assign your applications users to permissions within Amazon S3.
The better method would be to manage permissions within your application. When a user requests access to a file, the application can determine whether they should be permitted access. If they are permitted, then the application can generate a Pre-Signed URL.
A Pre-Signed URL permits access to private objects stored on Amazon S3. It is a means of keeping objects secure, yet granting temporary access to a specific object.
When listing available files, your application would generate links that include the pre-signed URL. Then, when a user clicks the link, they can access the file. Then, after a certain time has expired (eg 10 minutes), the link will no longer function. So, if a user shares a link with somebody else, it will probably have timed-out.
See: Creating a pre-signed URL in Ruby