i've tried to add this policy to my newly created S3 Bucket
{
"Id": "Policy1548665682202",
"Version": "2012-10-17",
"Statement": [
{
"Sid": "Stmt1548665490985",
"Action": "s3:*",
"Effect": "Allow",
"Resource": "arn:aws:s3:::darbazar-invoices-logs",
"Principal": {
"AWS": [
"fluentd.darbazar.invoices.user"
]
}
},
{
"Sid": "Stmt1548665526321",
"Action": [
"s3:GetObject"
],
"Effect": "Allow",
"Resource": "arn:aws:s3:::darbazar-invoices-logs",
"Principal": {
"AWS": [
"testavi.uzir"
]
}
}
]
}
here u can see 2 users, 1 user has full access and 1 user has only 1 Permission, but if i click save, the Invalid principal in policy warning has returned to my screen
why? i use the Official AWS S3 policy generator to generate this policy and this principal is exist in my IAM
Related
I am struggling with AWS IAM Role Policies, I am following a tutorial for Lambda function to read from s3 bucket event when a new file is uploaded and send it to AWS MediaConvert to convert the video file.
Lambda function is being able to read from s3 in test but it fails the job at MediaConvert.
I have set the policies to the roles and also gave inline policies but still I am unable to get it working.
AWS Elemental MediaConvert Screenshot
Policies set for IAM ROLE
IAM Policies
Json for inline policy
lambda-s3-policy-inlinepolicy
{
"Version": "2012-10-17",
"Statement": [
{
"Sid": "ExampleStmt",
"Action": [
"s3:GetObject"
],
"Effect": "Allow",
"Resource": [
"arn:aws:s3:::aws-mybucket-01/*"
]
}
]
}
Policy Summary
PolicySummaryImg
VodLambdaRole
{
"Version": "2012-10-17",
"Statement": [
{
"Action": [
"logs:CreateLogGroup",
"logs:CreateLogStream",
"logs:PutLogEvents"
],
"Resource": "*",
"Effect": "Allow",
"Sid": "Logging"
},
{
"Action": [
"iam:PassRole"
],
"Resource": [
"arn:aws:iam::myAccountID:role/my-lambda-role"
],
"Effect": "Allow",
"Sid": "PassRole"
},
{
"Action": [
"mediaconvert:*"
],
"Resource": [
"*"
],
"Effect": "Allow",
"Sid": "MediaConvertService"
},
{
"Effect": "Allow",
"Action": [
"sts:AssumeRole"
],
"Resource": "arn:aws:iam::myAccountID:role/my-lambda-role"
}
]
}
PolicySummary
Make sure that the IAM Role assigned to the MediaConvert job has a Trust Policy that trusts MediaConvert:
{
"Version": "2012-10-17",
"Statement": [
{
"Sid": "",
"Effect": "Allow",
"Principal": {
"Service": "mediaconvert.amazonaws.com"
},
"Action": "sts:AssumeRole"
}
]
}
This is normally generated automatically when you create an IAM Role in the management console and select MediaConvert as the Service.
Am trying to grant the cross account access for S3 bucket to work with lambda function . In that case , first trying assign appropriate bucket policy for both source and target buckets based on the following link .
https://aws.amazon.com/premiumsupport/knowledge-center/cross-account-access-s3/
Source Bucket Policy :
{
"Version": "2012-10-17",
"Statement": [
{
"Sid": "DelegateS3Access",
"Effect": "Allow",
"Principal": {
"AWS": "arn:aws:iam::777777777:role/Staff"
},
"Action": [
"s3:ListBucket",
"s3:GetObject",
"s3:PutObject",
"s3:PutObjectAcl"
],
"Resource": [
"arn:aws:s3:::source-bucktet-testing-lambda/*",
"arn:aws:s3:::source-bucktet-testing-lambda"
]
}
]
}
Target Policy :
{
"Version": "2012-10-17",
"Statement": [{
"Effect": "Allow",
"Principal": {
"AWS": "arn:aws:iam:: 777777777:role/Staff"
},
"Action": [
"s3:GetObject",
"s3:PutObject",
"s3:PutObjectAcl"
],
"Resource": [
"arn:aws:s3:::source-bucktet-testing-lambda/*",
"arn:aws:s3:::source-bucktet-testing-lambda"
]
}]
}
But in Target bucket policy is telling , Policy has invalid resource. Can you please help me on this .
Has anyone encountered the situation when I use manage policies on a user, It works but when I use inline policy it says access denied. I am giving Read access to a bucket for IAM user that is it can only access that bucket.
Manage Policy
{
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Action": [
"s3:Get*",
"s3:List*"
],
"Resource": "*"
}
]
}
Inline Policy
{
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Action": [
"s3:Get*",
"s3:List*"
],
"Resource": "arn:aws:s3:::mybucketname/*"
}
]
}
I also tried this
{
"Version": "2012-10-17",
"Statement": [
{
"Sid": "S3Permissions",
"Action": "s3:*",
"Effect": "Allow",
"Resource": [
"arn:aws:s3:::mybucketname/*",
"arn:aws:s3:::mybucketname"
]
}
]
}
Your last policy should be fine for direct access to the bucket as explained in:
How can I grant a user Amazon S3 console access to only a certain bucket or folder?
For console access, additional permissions are required, as shown in:
Writing IAM Policies: How to Grant Access to an Amazon S3 Bucket
Specifically the policy should like like:
{
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Action": [
"s3:GetBucketLocation",
"s3:ListAllMyBuckets"
],
"Resource": "*"
},
{
"Effect": "Allow",
"Action": ["s3:ListBucket"],
"Resource": ["arn:aws:s3:::test"]
},
{
"Effect": "Allow",
"Action": [
"s3:PutObject",
"s3:GetObject",
"s3:DeleteObject"
],
"Resource": ["arn:aws:s3:::test/*"]
}
]
}
Amazons3ReadonlyAccess has all the above permissions, your inline policy does not.
I have a lambda function using a role with the following policy excerpt
{
"Effect": "Allow",
"Action": [
"s3:GetObject",
"s3:ListBucket"
],
"Resource": [
"arn:aws:s3:::ipwl-lambda-config/*",
"arn:aws:s3:::ipwl-lambda-config"
]
}
My bucket policy looks like the following
{
"Version": "2012-10-17",
"Statement": [
{
"Sid": "DenyUnEncryptedObjectUploads",
"Effect": "Deny",
"Principal": {
"AWS": "*"
},
"Action": "s3:PutObject",
"Resource": "arn:aws:s3:::ipwl-lambda-config/*",
"Condition": {
"StringNotEquals": {
"s3:x-amz-server-side-encryption": "aws:kms"
}
}
},
{
"Sid": "AllowLambda",
"Effect": "Allow",
"Principal": {
"AWS": "arn:aws:iam::accountid:role/iam_for_lambda"
},
"Action": [
"s3:ListBucket",
"s3:GetObject"
],
"Resource": [
"arn:aws:s3:::ipwl-lambda-config/*",
"arn:aws:s3:::ipwl-lambda-config"
]
}
]
}
I've allowed GetObject and ListBucket on both the role and the bucket policy. However when my function runs
s3_obj = s3_res.Object(s3_bucket, s3_object)
I get
[ERROR] ClientError: An error occurred (AccessDenied) when calling the
GetObject operation: Access Denied
What more permissions do I have to add? The object is there, I can get it when I run the code locally using an admin role.
Update
I've checked to make sure the bucket and object names are correct dozens of times. The exception is actually coming from the second line here according to the stacktrace
s3_res = boto3.resource('s3')
s3_obj = s3_res.Object(s3_bucket, s3_object)
data = s3_obj.get()['Body'].read()
KMS should only be a factor for PutObject. We have a support account so I may check with them and update with their findings.
To download a KMS-encrypted object from S3, you not only need to be able to get the object. You also need to be able to decrypt the AWS KMS key.
Here's an example of an IAM policy that your Lambda function should have:
{
"Version": "2012-10-17",
"Statement": [
{
"Sid": "s3get",
"Effect": "Allow",
"Action": "s3:GetObject",
"Resource": "arn:aws:s3:::ipwl-lambda-config/*"
},
{
"Sid": "kmsdecrypt",
"Effect": "Allow",
"Action": "kms:Decrypt",
"Resource": "arn:aws:kms:example-region-1:123456789012:key/example-key-id"
}
]
}
The key policy also needs to allow the IAM role to decrypt the key, something like this:
{
"Sid": "kmsdecrypt",
"Effect": "Allow",
"Principal": {
"AWS": "arn:aws:iam::123456789012:role/xyz"
},
"Action": "kms:Decrypt",
"Resource": "*"
}
I am using inline policy for grant access to s3 bucket for IAM user
{
"Version": "2012-10-17",
"Statement": [
{
"Sid": "Stmt1513073615000",
"Effect": "Allow",
"Action": [
"s3:*"
],
"Resource": [
"arn:aws:s3:::newput-test"
]
}
]
}
but on extended s3 browser when I use the access key id and secret access key of particular IAM user is not listing my bucket.but when I pass * in resources It works fine
{
"Version": "2012-10-17",
"Statement": [
{
"Sid": "Stmt1513073615000",
"Effect": "Allow",
"Action": [
"s3:*"
],
"Resource": [
"*"
]
}
]
}
but the problem is its giving access to all the s3 bucket to IAM user.
but I want to give access only single bucket anybody have an idea how to achieve this.
Try something like this
{
"Statement": [
{
"Effect": "Allow",
"Action": "s3:ListAllMyBuckets",
"Resource": "arn:aws:s3:::*"
},
{
"Effect": "Allow",
"Action": "s3:*",
"Resource": [
"arn:aws:s3:::mys3bucket",
"arn:aws:s3:::mys3bucket/*"
]
}
]
}
Its been explained here.
http://www.fizerkhan.com/blog/posts/Restrict-user-access-to-Single-S3-Bucket-using-Amazon-IAM.html