To retrieve the credentials (aws_access_key, aws_secret_access_key, aws_session_token) to access AWS services via the cli, we have to call a custom service first to get our temporary credentials. If the credentials have expired we need to retrieve new credentials.
Using boto it is possible to write a custom credential provider by extending boto.provider.Provider. Is something similar possible to extend the aws cli?
Although not documented, I know it is possible to write plugins for the aws cli. Can I leverage this functionality to implement my own credential retriever?
You'll need to create an object that implements the CredentialProvider class in botocore.
Once that's created you can have the CLI add it to the set of credential providers to check.
If you want an example of this, the AssumeRole credential provider is written as an "internal" plugin in the CLI. You'd need to do something similar to this. You'll get the credential_provider component from the session and then inject yours into the chain. You might want to take a look at the default set of providers and decide where your custom credential provider should be placed.
Related
Is there a way to retrieve a secret from the AWS secret store using DefaultAWSCredentialsProviderChain java class?
If not please suggest a way to retrieve it? (I need this in the context of doing signature V4 signing the request to connect with AWS Neptune. For signature signing, I am using this example. But my secrets are in AWS secret manager, So How can I retrieve the secret from the secret store with DefaultAWSCredentialsProviderChain)
I'm not sure if Secrets Manager exposes a AWSCredentialsProvider interface, but even if they don't support one, it should be easy to write something up.
Here is a sample implementation that uses the Secrets Manager APIs to expose a credentials provider implmentation:
https://github.com/jenkinsci/aws-secrets-manager-credentials-provider-plugin/blob/0e12e02a759d13524ed7f5cd0125ef6eab47ff7d/src/main/java/io/jenkins/plugins/credentials/secretsmanager/AwsCredentialsProvider.java
Once you have something like this, just make sure you pass it to the SigV4Signer that you use in your application.
Reference: https://github.com/aws/amazon-neptune-sigv4-signer/blob/master/src/main/java/com/amazonaws/neptune/auth/NeptuneSigV4SignerBase.java#L77-L86
Hope this helps.
It is possible with aws secretsmanager
Use these docs
Below code creates AWS Credentials where access and secret keys are explicitly supplied.
AWSCredentials credentials = new BasicAWSCredentials(
"<AWS accesskey>",
"<AWS secretkey>"
);
But the issue with this approach is in production I can not use it.
So what will be an equivalent java code that will obtain credential automatically from the aws credentials chain and create a credential object or some EC2 client.
There are several alternatives you can use to store and recover your credentials in production. You should check the official documentation by AWS about 'Using the Default Credential Provider Chain'. Basically, you can use any of these alternatives:
Environment variables.
Java system properties.
The default credential profiles file.
Amazon ECS container credentials.
Instance profile credentials.
Depending on which one you choose it would use a different code. You have guidelines on how to use them in the above link.
My use case is as follows:
I need to push some data into AWS SQS queue using JAVA SDK and by help of IAM role (not using credential provider implementation).
Is there any way to do that?
Thanks for help in advance.
It's been a while, but this is not currently the case, it is now possible to use assume role with the Java SDK with a user. You can configure credentials in your .aws/credentials file as follows:
[useraccount]
aws_access_key_id=<key>
aws_secret_access_key=<secret>
[somerole]
role_arn=<the ARN of the role you want to assume>
source_profile=useraccount
Then, when you launch, set an environment variable: AWS_PROFILE=somerole
The SDK will use the credentials defined in useraccount to call assumeRole with the role_arn you provided. You'll of course need to be sure that the user with those credentials has the permissions to assume that role.
Note that if you're not including the full Java SDK in your project (i.e. you're including just the libraries for the services you need), you also need to include the aws-java-sdk-sts library in your classpath for this to work.
It is also possible to do all of this programmatically using STSAssumeRoleSessionCredentialsProvider, but this would require you to directly configure all of the services so it might not be as convenient as the profile approach which should just work for all services.
You can use role based authentication only on EC2 Instances, ECS Containers and Lambda functions. It is not possible to use them locally or on on premise servers.
DefaultAWSCredentialsProviderChain will automatically pick the EC2 Instance Role if it can't find the credentials via any of other methods. You can also create a custom AWSCredentialsProviderChain object with only injecting a instance of InstanceProfileCredentialsProvider to it like here
AWSCredentialsProviderChain myCustomChain = new AWSCredentialsProviderChain(new InstanceProfileCredentialsProvider());
For more info: https://docs.aws.amazon.com/java-sdk/latest/developer-guide/java-dg-roles.html
My Aws Lambda function is written in Java. I am getting data from DynamoDb by giving some static credentials like below;
new BasicAWSCredentials(ACCESSKEY, SECRETKEY)
However, when i try to define my services in Aws Cloudformation. I could not find any way, how can i change these accesskey and secretkey credentials. What is the best way for managing these credentials?, Because they are special keys for each account and embedded in Java code.
Although you could use the context or download a file to pass credentials in runtime, one should not use explicit hard-coded credentials, as that is harder to acquire and rotate securely.
It is easier and safer to use roles, as described in the lambda permission model: http://docs.aws.amazon.com/lambda/latest/dg/intro-permission-model.html
Use explicit credentials only outside AWS (your dev machine for example), and even so do not hard-code them, use environment variables or CLI profiles.
I've been looking in to getting the AWS (web) console hooked up to an AD or ADFS setup for managing users. It was reasonable easy to get working with a SAML Identity Provider in IAM and some existing ADFS infrastructure.
The problem is that users that authenticate that way, as opposed to normal AWS user accounts, don't have any way to have associated access keys so far as I can tell. Access keys are a key concept for authenticating stuff such as the AWS CLI, which needs to be tied to individual user accounts.
What are the workarounds to allow a user authenticated via a SAML identity provider to still be able to easily use the aws CLI? The only thing I've come up with to far is some hacky crap that would proxy the aws cli command, request temporary 1-hour credentials from the aws STS service, put them in the aws credentials file, and forward the command to the normal AWS cli. But, that makes me want to throw up a little bit; plus, I have no idea if it would work if a command took over an hour to complete (large s3 uploads, etc..)
Suggestions? I would try the official Directory Service AD connector, but my understanding is users still just assume IAM roles and would ultimately have the same problem.
https://github.com/Versent/saml2aws was created to address this, and has a vibrant open source community behind it.
I've had success with aws-adfs for AWS CLI via ADFS
The repo owner is currently adding support for DUO MFA as well.
It works by authenticating the user to the same page you'd use for console access then scraping the roles available. You choose a role and then aws-adfs sets the default user to the credential set needed for sts access.
After the default user is set you can cli like normal: aws s3 ls
https://github.com/venth/aws-adfs