I am trying to do a simple task where in I must be able to download a file in S3 which has a specific tag via SFTP. I am trying to achieve this by inserting a condition to the SFTP IAM Policy.
{
"Version": "2012-10-17",
"Statement": [
{
"Sid": "AllowListingOfUserFolder",
"Action": [
"s3:ListBucket",
"s3:GetBucketLocation"
],
"Effect": "Allow",
"Resource": [
"arn:aws:s3:::bucket_name"
]
},
{
"Sid": "HomeDirObjectAccess",
"Effect": "Allow",
"Action": [
"s3:GetObject"
],
"Resource": "arn:aws:s3:::bucket_name/*",
"Condition": {
"StringEquals": {
"s3:ExistingObjectTag/key": "value"
}
}
}
]
}
But when I use this policy with the SFTP role, WinSCP throws permission denied error when I try to login to the server. I am able to login only if I remove the Condition part in the policy. If anyone knows how to do this, please guide me. Thanks in advance.
It is not possible to restrict GetObject based on object tags.
IAM checks whether the user is entitled to make the request before it looks at the objects in Amazon S3 themselves. The tags are not available during this process.
Putting the objects in folders and restricting access by folder should meet your requirements.
I want to allow a user permission to list all buckets, and read analytics on any bucket that has it enabled. I have following policy:
{
"Version": "2012-10-17",
"Statement": [
{
"Sid": "ListBucketsReadAnalytics",
"Effect": "Allow",
"Action": [
"s3:ListAllMyBuckets",
"s3:GetAnalyticsConfiguration",
"s3:GetMetricsConfiguration"
],
"Resource": "*"
}
]
}
When I go to any S3 bucket's analytics I get the message:
Analyzing your data
We are analyzing your storage usage and will share the observed infrequent access patterns.
I don't get that when I access same buckets analytics with admin user. Is there a policy I am missing? I can't seem to Google this one, if someone knows good knowledge base or method to figuring which policies I need for action "x" please share.
Ok, went with brute force, following is sufficient:
{
"Sid": "S3Analytics",
"Effect": "Allow",
"Action": [
"s3:GetObject",
"s3:ListAllMyBuckets",
"s3:GetAnalyticsConfiguration"
],
"Resource": "*"
}
I am having trouble connecting to AWS Transfer for SFTP. I successfully set up a server and tried to connect using WinSCP.
I set up an IAM role with trust relationships like follows:
{
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Principal": {
"Service": "transfer.amazonaws.com"
},
"Action": "sts:AssumeRole"
}
]
}
I paired this with a scope down policy as described in the documentation using a home directory homebucket and home directory homedir
{
"Version": "2012-10-17",
"Statement": [
{
"Sid": "ListHomeDir",
"Effect": "Allow",
"Action": [
"s3:ListBucket",
"s3:GetBucketAcl"
],
"Resource": "arn:aws:s3:::${transfer:HomeBucket}"
},
{
"Sid": "AWSTransferRequirements",
"Effect": "Allow",
"Action": [
"s3:ListAllMyBuckets",
"s3:GetBucketLocation"
],
"Resource": "*"
},
{
"Sid": "HomeDirObjectAccess",
"Effect": "Allow",
"Action": [
"s3:DeleteObjectVersion",
"s3:DeleteObject",
"s3:PutObject",
"s3:GetObjectAcl",
"s3:GetObject",
"s3:GetObjectVersionAcl",
"s3:GetObjectTagging",
"s3:PutObjectTagging",
"s3:PutObjectAcl",
"s3:GetObjectVersion"
],
"Resource": "arn:aws:s3:::${transfer:HomeDirectory}*"
}
]
}
I was able to authenticate using an ssh key, but when it came to actually reading/writing files I just kept getting opaque errors like "Error looking up homedir" and failed "readdir". This all smells very much like problems with my IAM policy but I haven't been able to figure it out.
We had similar issues getting the scope down policy to work with our users on AWS Transfer. The solution that worked for us, was creating two different kinds of policies.
Policy to attach to the role which has general rights on the whole bucket.
Scope down policy to apply to the user which makes use of the transfer service variables like {transfer:UserName}.
We concluded that maybe only the extra attached policy is able to resolve the transfer service variables. We are not sure if this is correct and if this is the best solution, because this opens the possible risk when forgiving to attach the scope down policy to create a kind of "admin" user. So I'd be glad to get input to further lock this down a little bit.
Here is how it looks in my console when looking at the transfer user details:
Here are our two policies we use:
General policy to attach to IAM role
{
"Version": "2012-10-17",
"Statement": [
{
"Sid": "AllowListingOfUserFolder",
"Action": [
"s3:ListBucket",
"s3:GetBucketLocation"
],
"Effect": "Allow",
"Resource": [
"arn:aws:s3:::my-s3-bucket"
]
},
{
"Sid": "HomeDirObjectAccess",
"Effect": "Allow",
"Action": [
"s3:PutObject",
"s3:GetObject",
"s3:DeleteObjectVersion",
"s3:DeleteObject",
"s3:GetObjectVersion"
],
"Resource": "arn:aws:s3::: my-s3-bucket/*"
}
]
}
Scope down policy to apply to transfer user
{
"Version": "2012-10-17",
"Statement": [
{
"Sid": "AllowListingOfUserFolder",
"Action": [
"s3:ListBucket"
],
"Effect": "Allow",
"Resource": [
"arn:aws:s3:::${transfer:HomeBucket}"
],
"Condition": {
"StringLike": {
"s3:prefix": [
"${transfer:UserName}/*",
"${transfer:UserName}"
]
}
}
},
{
"Sid": "AWSTransferRequirements",
"Effect": "Allow",
"Action": [
"s3:ListAllMyBuckets",
"s3:GetBucketLocation"
],
"Resource": "*"
},
{
"Sid": "HomeDirObjectAccess",
"Effect": "Allow",
"Action": [
"s3:PutObject",
"s3:GetObject",
"s3:DeleteObjectVersion",
"s3:DeleteObject",
"s3:GetObjectVersion"
],
"Resource": "arn:aws:s3:::${transfer:HomeDirectory}*"
}
]
}
I had a similar problem but with a different error behavior. I managed to log in successfully, but then the connection was almost immediately closed.
I did the following things:
Make sure that the IAM role that allows bucket access also contains KMS access if your bucket is encrypted.
Make sure that the trust relationship is also part of that role.
Make sure that the server itself has a Cloudwatch role also with a trust relationship to transfer.amazonaws.com! This was the solution for me. I don't get why this is needed but without the trust relationship in the Cloudwatch role, my connection get's closed.
I hope that helps.
Edit: Added a picture for the settings of the CloudWatch role:
The bucket policy for the IAM user role can look like this:
{
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Action": [
"s3:ListBucket"
],
"Resource": [
"arn:aws:s3:::<your bucket>"
]
},
{
"Effect": "Allow",
"Action": [
"s3:PutObject",
"s3:GetObject",
"s3:DeleteObject"
],
"Resource": [
"arn:aws:s3:::<your bucket>/*"
]
}
]
}
Finally, also add a Trust Relationship as shown above for the user IAM role.
If you can connect to your sftp but then get a readdir error when trying to list contents, e.g. with the command "ls", then that's a sign that you have no bucket permission. If your connection get's closed right away it seems to be a Trust Relationship issue or a KMS issue.
According to the somewhat cryptic documentation #limfinity was correct. To scope down access you need a general Role/Policy combination granting access to see the bucket. This role gets applied to the SFTP user you create. In addition you need a custom policy which grants CRUD rights only to the user's bucket. The custom policy is also applied to the SFTP user.
From page 24 of this doc... https://docs.aws.amazon.com/transfer/latest/userguide/sftp.ug.pdf#page=28&zoom=100,0,776
To create a scope-down policy, use the following policy variables in your IAM policy:
AWS Transfer for SFTP User Guide
Creating a Scope-Down Policy
• ${transfer:HomeBucket}
• ${transfer:HomeDirectory}
• ${transfer:HomeFolder}
• ${transfer:UserName}
Note
You can't use the variables listed preceding as policy variables in an IAM role definition. You create these variables in an IAM policy and supply them directly when setting up your user. Also, you can't use the ${aws:Username}variable in this scope-down policy. This variable refers to an IAM user name and not the user name required by AWS SFTP.
Can't comment, sorry if I'm posting incorrectly.
Careful with AWS's default policy!
This solution did work for me in that I was able to use scope-down policies for SFTP users as expected. However, there's a catch:
{
"Sid": "AWSTransferRequirements",
"Effect": "Allow",
"Action": [
"s3:ListAllMyBuckets",
"s3:GetBucketLocation"
],
"Resource": "*"
},
This section of the policy will enable SFTP users using this policy to change directory to root and list all of your account's buckets. They won't have access to read or write, but they can discover stuff which is probably unnecessary. I can confirm that changing the above to:
{
"Sid": "AWSTransferRequirements",
"Effect": "Allow",
"Action": [
"s3:ListAllMyBuckets",
"s3:GetBucketLocation"
],
"Resource": "${transfer:HomeBucket}"
},
... appears to prevent SFTP users from listing buckets. However, they can still cd to directories if they happen to know buckets that exist -- again they dont' have read/write but this is still unnecessary access. I'm probably missing something to prevent this in my policy.
Proper jailing appears to be a backlog topic: https://forums.aws.amazon.com/thread.jspa?threadID=297509&tstart=0
We were using the updated version of SFTP with Username and Password and had to spend quite some time to figure out all details. For the new version, the Scope down policy needs to be specified as 'Policy' key within Secrets Manager. This is very important for the whole flow to work.
We have documented the full setup on our site here - https://coderise.io/sftp-on-aws-with-username-and-password/
Hope that helps!
I am trying to give a programmatic IAM user access to a single bucket.
I setup the following policy and attached it to the user:
{
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Action": [
"s3:ListBucket"
],
"Resource": [
"arn:aws:s3:::mybucket"
]
},
{
"Effect": "Allow",
"Action": [
"s3:PutObject",
"s3:GetObject",
"s3:DeleteObject"
],
"Resource": [
"arn:aws:s3:::mybucket/*"
]
}
]
}
Trying to programatically upload a file I got a 403.
I got this policy from here:
Writing IAM Policies: How to Grant Access to an Amazon S3 Bucket
I verified that everything else is working by then adding an AWS managed policy, AmazonS3FullAccess, after which my upload succeeded. But I would rather not give this user full access.
There are no other policies attached to this user.
Nothing is wrong with your policy. Make sure you're using the right bucket name in the IAM policy and to add the policy to the user.
You can test it with IAM Policy Simulator. Maybe you should consider the time to policies take effect, but it's "almost immediately". See this answer.
You can try this policy to give full access to a particular bucket:
{
"Version": "2012-10-17",
"Statement": [{
"Action": "s3:*",
"Effect": "Allow",
"Resource": [
"arn:aws:s3:::<BUCKETNAME>/*"
]
},
{
"Effect": "Allow",
"Action": "s3:ListAllMyBuckets",
"Resource": "arn:aws:s3:::*"
}
]
}
Since you are providing Put, Get, Delete, You might as well provide full access to the particular bucket.
Created an IAM user, with S3 full access (S3:*) on a specific ARN (only one bucket). Upload and delete works, but not able to rename or copy/paste.
Here is my IAM policy.
{
"Sid": "Stmt1490288788",
"Effect": "Allow",
"Action": [
"s3:*"
],
"Resource": [
"arn:aws:s3:::bucket-name/*"
]
}
I don't know if this is the correct solution, but giving ListAllMyBuckets permission worked for me.
I just added another statement along with the previous one.
{
"Sid": "Stmt1490288788",
"Effect": "Allow",
"Action": [
"s3:*"
],
"Resource": [
"arn:aws:s3:::bucket-name/*"
]
}{
"Sid": "Stmt1490289746001",
"Effect": "Allow",
"Action": [
"s3:ListAllMyBuckets"
],
"Resource": [
"arn:aws:s3:::*"
]
}
So this policy lists all the buckets, but only allow put/delete/get access to the specific bucket. Still wondering what's the relation between rename/copy & list all bucket permissions.
While there isn't actually rename functionality in S3 itself, some interfaces may try and implement it by using S3 PUT object copy and DELETE actions behind the scenes. Their implementation may require other bucket-level permissions to complete, which is why it may be failing with your policy. Try this:
{
"Sid": "Stmt1490288788",
"Effect": "Allow",
"Action": [
"s3:*"
],
"Resource": [
"arn:aws:s3:::bucket-name",
"arn:aws:s3:::bucket-name/*"
]
}
The difference being this grants permissions to actions performed on the bucket itself (the first resource declared), as well as the objects in the bucket (the second resource declared).