In IAM Trust Policy we can use the MultiFactorAuthPresent condition to enforce MFA to be enabled. However, does that condition work with an external Identity Provider? e.g. If I'm authenticated using Azure AD or Google Workspace, the authentication is done at the external Identity provider, does the MFA info gets passed to IAM?
How about AWS SSO with an external provider? Is it the same?
When authentication is done by External IdP (i.e. Azure AD), MFA is performed as part of the authentication flow before SAMLResponse is returned to AWS Signin page. For Azure AD IdP, you can use Conditional Access policy to enforce MFA for the application.
I haven't tested but I would think you can pass an additional attribute (outside of the role trust arn, role arn attribute. Then you can read the value at the IAM trust policy level. You can get more info at Passing session tags in AWS STS.
Related
I've encountered following error message when I'm trying to integrate AWS Cognito and AWS ElasticSearch with AD. I've setup AD and cognito integration but after login with AD-User in AD Console, I've encountered following message. But when I've created user in AWS Cognito and login with its authentication, it was working. Please let me what I've missed to configure it. Thanks.
• Check whether the user pool id and app client id from user pool configurations are correctly configured in federated identities page. Also, check whether correct template is selected for authentication to Active Directory purposes, i.e., ‘Allow access for one or more AWS accounts or IAM users’ is selected.
• Please ensure that the Amazon Elasticsearch domain has sufficient access to the authorized AD users and groups through the access control policy. Also, check the IAM roles with the exact same name as AD groups are authorized or permitted for authentication with Active Directory or not.
• If using ADFS for federated identities with Microsoft Active Directory, check the replying party SAML 2.0 SSO service URL in ADFS configuration. Also, check the claim rules in ADFS and the issuance policy in ADFS. On the AWS side in elastic search console, check the roles key configuration under optional SAML settings.
Please find the below links for more information: -
https://aws.amazon.com/blogs/security/configure-saml-single-sign-on-for-kibana-with-ad-fs-on-amazon-elasticsearch-service/
Sorry! Something went wrong during authentication between Kibana and Amazon Cognito
We have an external application resides outside of Amazon network and it needs to access our SQS and send message there, in order for our AWS resource to recognize the request from that application it needs to sign its request with the credentials of the IAM role we created, I'm wondering what is the best way for that external application to retrieve temp credentials from us? I have tried to implement it using Amazon Cognito but it looks like Cognito fits more in scenarios like user sign-up and sign-in with an User Interface, anyone has any suggestions? Thanks in advance.
To be able to obtain temporary credentials, you need a form of permanent credentials that can access (or generate) the temporary credentials.
Given your situation, you might consider creating an IAM User in your account and giving those credentials to the third-party. Grant the appropriate permissions to those credentials and they can use them directly with Amazon SQS.
Or, if you'd rather not give IAM credentials to third-parties, you could ask them to create an AWS account and an IAM User. You could then grant their IAM user access to the Amazon SQS queue.
Another option is that the third-party could access an application or API that you provide. Once they authenticate, you can provide temporary credentials created with the Security Token Service. Cognito would be an option for performing this authentication and it can also provide credentials for an associated IAM Role, thus giving them access to the Amazon SQS queue.
Following articles on AWS Web Identity Federation I am a bit confused as to how can I ensure that each user who executes the AssumeRoleWithWebIdentity call can assume a different role? Is that even possible?
The following are the steps (ref.):
1. Mobile or Web Application needs to be configured with the IdP which gives each application a unique ID or client ID (also called audience)
2. Create an Identity Provider entity for OIDC compatible IdP in IAM.
3. Create IAM role and define the
1. Trust policy – specify the IdP (like Amazon) as the Principal (the trusted entity), and include a Condition that matches the IdP assigned app ID
2. Permission policy – specify the permissions the application can assume
4. Application calls the sign-in interface for the IdP to login
5. IdP authenticates the user and returns an authentication token (OAuth access token or OIDC ID token) with information about the user to the application
6. Application then makes an unsigned call to the STS service with the **AssumeRoleWithWebIdentity** action to request temporary security credentials.
7. Application passes the IdP’s authentication token along with the Amazon Resource Name (ARN) for the IAM role created for that IdP.
8. AWS verifies that the token is trusted and valid and if so, returns temporary security credentials (access key, secret access key, session token, expiry time) to the application that have the permissions for the role that you name in the request.
9. STS response also includes metadata about the user from the IdP, such as the unique user ID that the IdP associates with the user.
10. Using the Temporary credentials, the application makes signed requests to AWS
11. User ID information from the identity provider can distinguish users in the app for e.g., objects can be put into S3 folders that include the user ID as prefixes or suffixes. This lets you create access control policies that lock the folder so only the user with that ID can access it.
12. Application can cache the temporary security credentials and refresh them before their expiry accordingly. Temporary credentials, by default, are good for an hour.
So from the above, in step 11, I can add dynamic resource policies to resources to allow for user specific access, e.g. for S3. Although what happens for resources which don't support resource policies?
E.g. how can I ensure that one user logging in using Google for example, gets Write access (WriteRole) to DynamoDB whereas another using logging in using the same Google IdP only gets Read access (ReadRole) to DynamoDB?
Any help will be appreciated.
I'm a newbie to AWS, I'm building an application where the users should be logged in via AWS account.
So I created a user pool and authenticated via AWS SDK using the federated identities. But the users were created manually in the Cognito UI.But the requirement is to authenticate the user if they already resides in AWS as an IAM user. But AWS cognito does not provide a workflow to import the IAM users to cognito pool. So is there another way to accomplish this via AWS ? Thanks in Advance.
This is currently not possible. Although AWS Cognito Federated Identities allows, federating an external identity provider to grant AWS access, the other way around is not possible.
In addition, there is no method in AWS IAM SDK to verify AWS Username and Password, which also limits verifying them through your own implementation.
Anybody could explain why the operation assume-role-with-saml needs some parameters that are already in the saml-assertion such as role-arn and principal-arn?
After some research I'm able to answer. I was asking why send the --role-arn parameter if it is already in the saml assertion. In fact the saml assertion can have more than one role so in the api request is necessary to identify which role should be assumed. I found the answer in this link
The Amazon documentation for assume-role-with-saml provides the information:
The --role-arnstring option identifies the role that the caller is assuming.
The --principal-arnstring option requires closer reading. Amazon says
The Amazon Resource Name (ARN) of the SAML provider in AWS IAM that describes the IdP.
The explanation for the latter is given a few paragraphs before:
Before your application can call assume-role-with-saml , you must configure your SAML identity provider (IdP) to issue the claims required by AWS.
The same page provides a link to Using Identity Providers, which explains the term:
Using identity providers, you can manage user identities outside of AWS, and you can give these external user identities permissions to use AWS resources in your account.
That is, you could associate an external user identity with a role using the --principal-arn option. The --role-arn option is not really optional, but a required parameter.
The saml-assertion (--saml-assertionstring) option) is additional "glue" which may be used to check permissions. Following the link in the description for this option to Configuring a Relying Party and Adding Claims, Amazon says
You also need to create appropriate claim rules in your IdP with AWS as a relying party. These rules map information about users and groups in your organization into appropriate SAML attributes. This lets you make sure that SAML authentication responses (assertions) from your IdP contain the necessary attributes that AWS uses in IAM policies to check permissions for federated users.
and in turn, that links to a page describing the assertions: Configure Assertions for the SAML Authentication Response