aws sts assume role returns accesskeyid masked "***"

Question

I am invoking sts assume role inside a codebuild image and the response credential has accessKeyId = "***" like this.

Also when tried the same command from my local machine got a proper accesskeyId. Any idea on what I am missing here ?

Request:

aws sts assume-role --role-arn arn:aws:iam::11111111:role/codepipeline_role --role-session-name codepipeline_role

Sample response: { "AssumedRoleUser": { "Arn": "arn:aws:sts::111111111111:assumed-role/codepipeline_role/codepipeline-role", "AssumedRoleId": "AROA6DS4I2EQXD2H5OXYE:codepipeline-role" }, "Credentials": { "AccessKeyId": "***", "Expiration": "2020-01-04T16:23:56Z", "SecretAccessKey": "SecretAccessKey", "SessionToken": "sessionTOken" } }

Thanks in advance!

Answer 1

Can you just try to use the values? It could be masked while echoing.

version: 0.2
phases:
  install:
    commands:
      - apt-get update
      - apt-get install -y jq
      - RESPONSE=$(aws sts assume-role --role-arn arn:aws:iam::123456789012:role/CLIRole --role-session-name `date "+%Y%m%d_%H%M%S"`)
      - export AWS_ACCESS_KEY_ID=$(echo $RESPONSE | jq -r '.Credentials.AccessKeyId')
      - export AWS_SECRET_ACCESS_KEY=$(echo $RESPONSE | jq -r '.Credentials.SecretAccessKey')
      - export AWS_SESSION_TOKEN=$(echo $RESPONSE | jq -r '.Credentials.SessionToken')
      #- Your aws cli command here...

Edit 1:

Checked using following buildspec (CodeBuild invoked from CodePipeline) and can confirm the role assumption was successful. The "***" is masking just when you are echoing:

version: 0.2 

phases: 
  install: 
    runtime-versions: 
      nodejs: 8 
    commands: 
      - ASSUME_ROLE_ARN="arn:aws:iam::123456789012:role/Shariq-Assumption-Test-Role" 
      - aws sts get-caller-identity 
      - TEMP_ROLE=`aws sts assume-role --role-arn $ASSUME_ROLE_ARN --role-session-name test` 
      - export TEMP_ROLE 
      - echo $TEMP_ROLE 
      - export AWS_ACCESS_KEY_ID=$(echo "${TEMP_ROLE}" | jq -r '.Credentials.AccessKeyId') 
      - export AWS_SECRET_ACCESS_KEY=$(echo "${TEMP_ROLE}" | jq -r '.Credentials.SecretAccessKey') 
      - export AWS_SESSION_TOKEN=$(echo "${TEMP_ROLE}" | jq -r '.Credentials.SessionToken') 
      - echo $AWS_ACCESS_KEY_ID 
      - echo $AWS_SECRET_ACCESS_KEY 
      - echo $AWS_SESSION_TOKEN 
      - aws sts get-caller-identity  

'Shariq-Assumption-Test-Role' had following Trust Policy:

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Principal": {
        "AWS": "arn:aws:iam::12345678910:root",
        "Service": "codebuild.amazonaws.com"
      },
      "Action": "sts:AssumeRole"
    }
  ]
}

Also, CodeBuild role should have sts:AssumeRole permission.

Build Logs:

[Container] 2020/01/05 12:59:13 Running command ASSUME_ROLE_ARN="arn:aws:iam::123456789012:role/Shariq-Assumption-Test-Role" 

[Container] 2020/01/05 12:59:13 Running command aws sts get-caller-identity 
{ 
    "UserId": "AROAXTEXAMPLEQ22FQDC:AWSCodeBuild-xxxxxxxx-104c-42b9-b71c-ff3e8ad44b16", 
    "Account": "123456789012", 
    "Arn": "arn:aws:sts::123456789012:assumed-role/codebuild-build-from-cp-service-role/AWSCodeBuild-xxxxxxxx-104c-42b9-b71c-ff3e8ad44b16" 
} 

[Container] 2020/01/05 12:59:18 Running command TEMP_ROLE=`aws sts assume-role --role-arn $ASSUME_ROLE_ARN --role-session-name test` 

[Container] 2020/01/05 12:59:18 Running command export TEMP_ROLE 

[Container] 2020/01/05 12:59:18 Running command echo $TEMP_ROLE 
{ "Credentials": { "AccessKeyId": "***", "SecretAccessKey": "R9QuqToY4qkcEXAMPLESGmTGJi4QawzS", "SessionToken": "FwoGZXIvYXdzEA4aDIwhkn5nVvvFBeBxXSLGAZmE1/Kw0CA9a/PEUG6VXyHyTrVryYzyRDEPdFUlzhXjqBj9h5x/Cz5aX/61aR2qSEXAMPLEBqm7OsI3zD3KA3NIIAr/u+l9f8AGZz+Ii6AeUoLFrkvH7d7JINGvouRNdrulkbzbnAAtGQx+8K1DxR0w4TbPbld3hQJYanGf6I4v3EieJuRckqxloEO6gF9W9EsqsluOogJVJAziimu8fwBTJLaKyaqg2Rr6w4JqrIB9fUngEnif/ggbIrscuadGLhXe7bSRKCrerk5DzEGP1uiZwH3P/De9wIOOClq", "Expiration": "2020-01-05T13:59:18Z" }, "AssumedRoleUser": { "AssumedRoleId": "AROAXTLSHEXAMPLE2TZT:test", "Arn": "arn:aws:sts::123456789012:assumed-role/Shariq-Assumption-Test-Role/test" } } 

[Container] 2020/01/05 12:59:18 Running command export AWS_ACCESS_KEY_ID=$(echo "${TEMP_ROLE}" | jq -r '.Credentials.AccessKeyId') 

[Container] 2020/01/05 12:59:18 Running command export AWS_SECRET_ACCESS_KEY=$(echo "${TEMP_ROLE}" | jq -r '.Credentials.SecretAccessKey') 

[Container] 2020/01/05 12:59:18 Running command export AWS_SESSION_TOKEN=$(echo "${TEMP_ROLE}" | jq -r '.Credentials.SessionToken') 

[Container] 2020/01/05 12:59:18 Running command echo $AWS_ACCESS_KEY_ID 
*** 

[Container] 2020/01/05 12:59:18 Running command echo $AWS_SECRET_ACCESS_KEY 
R9QuqToY4qkct327ZEXAMPLEmTGJi4QawzS 

[Container] 2020/01/05 12:59:18 Running command echo $AWS_SESSION_TOKEN 
FwoGZXIvYXdzEA4aDIwhkn5nVvvFBeBxXSLGAZmE1/Kw0CA9a/PEUG6VXyHyTrVryYzyRDEPdFUlzhXjqBj9h5x/Cz5aX/61aR2qSGwqMEjJToh0Bqm7OsI3zD3K4ot7wAeUoLFrkvH7d7JINGvouRNdrulkbzbnAAtGQx+8K1DxR0w4TbPbld3hQJYanEXAMPLE0h3U5xLXykuEcvOnuV6gF9W9EsqsluOogJVJAziimu8fwBTJLaKyaqg2Rr6w4JqrIB9fUngEnif/ggbIrscuadGLhXe7bSRKCrerk5DzEGPzqyMFCH+DHYsbeIeqXkbFYW1uiZwH3P/De9wIOOClq 

[Container] 2020/01/05 12:59:18 Running command aws sts get-caller-identity 
{ 
    "UserId": "AROAXTLEXAMPLELVE2TZT:test", 
    "Account": "123456789012", 
    "Arn": "arn:aws:sts::123456789012:assumed-role/Shariq-Assumption-Test-Role/test" 
}