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Add external account on ECS support. #324

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Add external account on ECS support. #324

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dd8cfe3
Add external account on ECS support.
alu Nov 20, 2024
e80e56e
Merge branch 'yoshidan:main' into main
alu Feb 26, 2025
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19 changes: 18 additions & 1 deletion foundation/auth/src/token_source/external_account_source/aws_subject_token_source.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -25,6 +25,7 @@ const AWS_REGION: &str = "AWS_REGION";
const AWS_SECRET_ACCESS_KEY: &str = "AWS_SECRET_ACCESS_KEY";
const AWS_SESSION_TOKEN: &str = "AWS_SESSION_TOKEN";
const AWS_IMDS_V2_SESSION_TOKEN_HEADER: &str = "X-aws-ec2-metadata-token";
const AWS_CONTAINER_CREDENTIALS_RELATIVE_URI: &str = "AWS_CONTAINER_CREDENTIALS_RELATIVE_URI";

pub struct AWSSubjectTokenSource {
subject_token_url: Url,
Expand Down Expand Up @@ -54,7 +55,12 @@ impl AWSSubjectTokenSource {
None
};

let credentials = get_security_credentials(&aws_session_token, &value.url).await?;
let credentials =
if let Some(credentials_relative_uri) = std::env::var(AWS_CONTAINER_CREDENTIALS_RELATIVE_URI).ok() {
get_security_credentials_on_ecs(&credentials_relative_uri).await?
} else {
get_security_credentials(&aws_session_token, &value.url).await?
};
let region = get_region(&aws_session_token, &value.region_url).await?;

let url = value
Expand Down Expand Up @@ -284,6 +290,17 @@ async fn get_security_credentials(
Ok(cred)
}

async fn get_security_credentials_on_ecs(credentials_relative_uri: &str) -> Result<AWSSecurityCredentials, Error> {
let client = default_http_client();
let builder = client.get(format!("http://169.254.170.2{credentials_relative_uri}"));
let response = builder.send().await?;
if !response.status().is_success() {
return Err(Error::UnexpectedStatusOnGetCredentials(response.status().as_u16()));
}

response.json().await.map_err(Error::from)
}

async fn get_region(temporary_session_token: &Option<String>, url: &Option<String>) -> Result<String, Error> {
if can_retrieve_region_from_environment() {
if let Ok(region) = var(AWS_REGION) {
Expand Down