AWS Signature Authentication Package

This crate may be used to generate presigned URLs for unmodeled behavior such as rds-iam-token.

Examples

Generate RDS IAM Token:

use aws_smithy_http::body::SdkBody;
use aws_types::region::{Region, SigningRegion};
use aws_types::{Credentials, SigningService};
use std::time::{Duration, SystemTime, UNIX_EPOCH};
use aws_sig_auth::signer::{self, SigningError, OperationSigningConfig, HttpSignatureType, RequestConfig};
fn generate_rds_iam_token(
db_hostname: &str,
region: Region,
port: u16,
db_username: &str,
credentials: &Credentials,
timestamp: SystemTime,
) -> Result<String, SigningError> {
let signer = signer::SigV4Signer::new();
let mut operation_config = OperationSigningConfig::default_config();
operation_config.signature_type = HttpSignatureType::HttpRequestQueryParams;
operation_config.expires_in = Some(Duration::from_secs(15 * 60));
let request_config = RequestConfig {
request_ts: timestamp,
region: &SigningRegion::from(region),
service: &SigningService::from_static("rds-db"),
payload_override: None,
};
let mut request = http::Request::builder()
.uri(format!(
"http://{db_hostname}:{port}/?Action=connect&DBUser={db_user}",
db_hostname = db_hostname,
port = port,
db_user = db_username
))
.body(SdkBody::empty())
.expect("valid request");
let _signature = signer.sign(
&operation_config,
&request_config,
&credentials,
&mut request,
)?;
let mut uri = request.uri().to_string();
assert!(uri.starts_with("http://"));
let uri = uri.split_off("http://".len());
Ok(uri)
}

let token = generate_rds_iam_token(
"prod-instance.us-east-1.rds.amazonaws.com",
Region::from_static("us-east-1"),
3306,
"dbuser",
&Credentials::from_keys("AKIDEXAMPLE", "secret", None),
// this value is hard coded to create deterministic signature for tests. Generally,
// `SystemTime::now()` should be used
UNIX_EPOCH + Duration::from_secs(1635257380)
).expect("failed to generate token");
# // validate against token generated by the aws CLI
# assert_eq!(token, "prod-instance.us-east-1.rds.amazonaws.com:3306/?Action=connect&DBUser=dbuser&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIDEXAMPLE%2F20211026%2Fus-east-1%2Frds-db%2Faws4_request&X-Amz-Date=20211026T140940Z&X-Amz-Expires=900&X-Amz-SignedHeaders=host&X-Amz-Signature=9632f5f4fcd2087a3c523f55f72d2fe97fad03b71a0a23b8c1edfb104e8072d1");