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#![doc(
html_logo_url = "https://raw.githubusercontent.com/rusoto/rusoto/master/assets/logo-square.png"
)]
#![cfg_attr(feature = "nightly-testing", feature(plugin))]
#![cfg_attr(not(feature = "unstable"), deny(warnings))]
#![deny(missing_docs)]
pub use crate::container::ContainerProvider;
pub use crate::environment::EnvironmentProvider;
pub use crate::instance_metadata::InstanceMetadataProvider;
pub use crate::profile::ProfileProvider;
pub use crate::secrets::Secret;
pub use crate::static_provider::StaticProvider;
pub use crate::variable::Variable;
pub mod claims;
mod container;
mod environment;
mod instance_metadata;
mod profile;
mod request;
mod secrets;
mod static_provider;
#[cfg(test)]
pub(crate) mod test_utils;
mod variable;
use async_trait::async_trait;
use std::collections::BTreeMap;
use std::env::{var as env_var, VarError};
use std::error::Error;
use std::fmt;
use std::io::Error as IoError;
use std::string::FromUtf8Error;
use std::sync::Arc;
use std::time::Duration;
use chrono::{DateTime, Duration as ChronoDuration, ParseError, Utc};
use hyper::Error as HyperError;
use serde::Deserialize;
use tokio::sync::Mutex;
pub trait Anonymous {
fn is_anonymous(&self) -> bool;
}
impl Anonymous for AwsCredentials {
fn is_anonymous(&self) -> bool {
self.aws_access_key_id().is_empty() && self.aws_secret_access_key().is_empty()
}
}
#[derive(Clone, Deserialize, Default)]
pub struct AwsCredentials {
#[serde(rename = "AccessKeyId")]
key: String,
#[serde(rename = "SecretAccessKey")]
secret: String,
#[serde(rename = "SessionToken", alias = "Token")]
token: Option<String>,
#[serde(rename = "Expiration")]
expires_at: Option<DateTime<Utc>>,
#[serde(skip)]
claims: BTreeMap<String, String>,
}
impl AwsCredentials {
pub fn new<K, S>(
key: K,
secret: S,
token: Option<String>,
expires_at: Option<DateTime<Utc>>,
) -> AwsCredentials
where
K: Into<String>,
S: Into<String>,
{
AwsCredentials {
key: key.into(),
secret: secret.into(),
token,
expires_at,
claims: BTreeMap::new(),
}
}
pub fn aws_access_key_id(&self) -> &str {
&self.key
}
pub fn aws_secret_access_key(&self) -> &str {
&self.secret
}
pub fn expires_at(&self) -> &Option<DateTime<Utc>> {
&self.expires_at
}
pub fn token(&self) -> &Option<String> {
&self.token
}
fn credentials_are_expired(&self) -> bool {
match self.expires_at {
Some(ref e) =>
{
*e < Utc::now() + ChronoDuration::seconds(20)
}
None => false,
}
}
pub fn claims(&self) -> &BTreeMap<String, String> {
&self.claims
}
pub fn claims_mut(&mut self) -> &mut BTreeMap<String, String> {
&mut self.claims
}
}
impl fmt::Debug for AwsCredentials {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
f.debug_struct("AwsCredentials")
.field("key", &self.key)
.field("secret", &"**********")
.field("token", &self.token.as_ref().map(|_| "**********"))
.field("expires_at", &self.expires_at)
.field("claims", &self.claims)
.finish()
}
}
#[derive(Clone, Debug, PartialEq)]
pub struct CredentialsError {
pub message: String,
}
impl CredentialsError {
pub fn new<S>(message: S) -> CredentialsError
where
S: ToString,
{
CredentialsError {
message: message.to_string(),
}
}
}
impl fmt::Display for CredentialsError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{}", self.message)
}
}
impl Error for CredentialsError {}
impl From<ParseError> for CredentialsError {
fn from(err: ParseError) -> CredentialsError {
CredentialsError::new(err)
}
}
impl From<IoError> for CredentialsError {
fn from(err: IoError) -> CredentialsError {
CredentialsError::new(err)
}
}
impl From<HyperError> for CredentialsError {
fn from(err: HyperError) -> CredentialsError {
CredentialsError::new(format!("Couldn't connect to credentials provider: {}", err))
}
}
impl From<serde_json::Error> for CredentialsError {
fn from(err: serde_json::Error) -> CredentialsError {
CredentialsError::new(err)
}
}
impl From<VarError> for CredentialsError {
fn from(err: VarError) -> CredentialsError {
CredentialsError::new(err)
}
}
impl From<FromUtf8Error> for CredentialsError {
fn from(err: FromUtf8Error) -> CredentialsError {
CredentialsError::new(err)
}
}
#[async_trait]
pub trait ProvideAwsCredentials {
async fn credentials(&self) -> Result<AwsCredentials, CredentialsError>;
}
#[async_trait]
impl<P: ProvideAwsCredentials + Send + Sync> ProvideAwsCredentials for Arc<P> {
async fn credentials(&self) -> Result<AwsCredentials, CredentialsError> {
P::credentials(self).await
}
}
#[derive(Debug, Clone)]
pub struct AutoRefreshingProvider<P: ProvideAwsCredentials + 'static> {
credentials_provider: P,
current_credentials: Arc<Mutex<Option<Result<AwsCredentials, CredentialsError>>>>,
}
impl<P: ProvideAwsCredentials + 'static> AutoRefreshingProvider<P> {
pub fn new(provider: P) -> Result<AutoRefreshingProvider<P>, CredentialsError> {
Ok(AutoRefreshingProvider {
credentials_provider: provider,
current_credentials: Arc::new(Mutex::new(None)),
})
}
pub fn get_ref(&self) -> &P {
&self.credentials_provider
}
pub fn get_mut(&mut self) -> &mut P {
&mut self.credentials_provider
}
}
#[async_trait]
impl<P: ProvideAwsCredentials + Send + Sync + 'static> ProvideAwsCredentials
for AutoRefreshingProvider<P>
{
async fn credentials(&self) -> Result<AwsCredentials, CredentialsError> {
loop {
let mut guard = self.current_credentials.lock().await;
match guard.as_ref() {
None => {
let res = self.credentials_provider.credentials().await;
*guard = Some(res);
}
Some(Err(e)) => return Err(e.clone()),
Some(Ok(creds)) => {
if creds.credentials_are_expired() {
*guard = None;
} else {
return Ok(creds.clone());
};
}
}
}
}
}
#[derive(Clone)]
pub struct DefaultCredentialsProvider(AutoRefreshingProvider<ChainProvider>);
impl DefaultCredentialsProvider {
pub fn new() -> Result<DefaultCredentialsProvider, CredentialsError> {
let inner = AutoRefreshingProvider::new(ChainProvider::new())?;
Ok(DefaultCredentialsProvider(inner))
}
}
#[async_trait]
impl ProvideAwsCredentials for DefaultCredentialsProvider {
async fn credentials(&self) -> Result<AwsCredentials, CredentialsError> {
self.0.credentials().await
}
}
#[derive(Debug, Clone)]
pub struct ChainProvider {
environment_provider: EnvironmentProvider,
instance_metadata_provider: InstanceMetadataProvider,
container_provider: ContainerProvider,
profile_provider: Option<ProfileProvider>,
}
impl ChainProvider {
pub fn set_timeout(&mut self, duration: Duration) {
self.instance_metadata_provider.set_timeout(duration);
self.container_provider.set_timeout(duration);
}
}
async fn chain_provider_credentials(
provider: ChainProvider,
) -> Result<AwsCredentials, CredentialsError> {
if let Ok(creds) = provider.environment_provider.credentials().await {
return Ok(creds);
}
if let Some(ref profile_provider) = provider.profile_provider {
if let Ok(creds) = profile_provider.credentials().await {
return Ok(creds);
}
}
if let Ok(creds) = provider.container_provider.credentials().await {
return Ok(creds);
}
if let Ok(creds) = provider.instance_metadata_provider.credentials().await {
return Ok(creds);
}
Err(CredentialsError::new(
"Couldn't find AWS credentials in environment, credentials file, or IAM role.",
))
}
#[async_trait]
impl ProvideAwsCredentials for ChainProvider {
async fn credentials(&self) -> Result<AwsCredentials, CredentialsError> {
chain_provider_credentials(self.clone()).await
}
}
impl ChainProvider {
pub fn new() -> ChainProvider {
ChainProvider {
environment_provider: EnvironmentProvider::default(),
profile_provider: ProfileProvider::new().ok(),
instance_metadata_provider: InstanceMetadataProvider::new(),
container_provider: ContainerProvider::new(),
}
}
pub fn with_profile_provider(profile_provider: ProfileProvider) -> ChainProvider {
ChainProvider {
environment_provider: EnvironmentProvider::default(),
profile_provider: Some(profile_provider),
instance_metadata_provider: InstanceMetadataProvider::new(),
container_provider: ContainerProvider::new(),
}
}
}
impl Default for ChainProvider {
fn default() -> Self {
Self::new()
}
}
fn non_empty_env_var(name: &str) -> Option<String> {
match env_var(name) {
Ok(value) => {
if value.is_empty() {
None
} else {
Some(value)
}
}
Err(_) => None,
}
}
fn parse_credentials_from_aws_service(response: &str) -> Result<AwsCredentials, CredentialsError> {
Ok(serde_json::from_str::<AwsCredentials>(response)?)
}
#[cfg(test)]
mod tests {
use std::fs::{self, File};
use std::io::Read;
use std::path::Path;
use crate::test_utils::{is_secret_hidden_behind_asterisks, lock_env, SECRET};
use quickcheck::quickcheck;
use super::*;
#[test]
fn default_empty_credentials_are_considered_anonymous() {
assert!(AwsCredentials::default().is_anonymous())
}
#[test]
fn credentials_with_values_are_not_considered_anonymous() {
assert!(!AwsCredentials::new("foo", "bar", None, None).is_anonymous())
}
#[test]
fn providers_are_send_and_sync() {
fn is_send_and_sync<T: Send + Sync>() {}
is_send_and_sync::<ChainProvider>();
is_send_and_sync::<AutoRefreshingProvider<ChainProvider>>();
is_send_and_sync::<DefaultCredentialsProvider>();
}
#[tokio::test]
async fn profile_provider_finds_right_credentials_in_file() {
let _guard = lock_env();
let profile_provider = ProfileProvider::with_configuration(
"tests/sample-data/multiple_profile_credentials",
"foo",
);
let credentials = profile_provider.credentials().await.expect(
"Failed to get credentials from profile provider using tests/sample-data/multiple_profile_credentials",
);
assert_eq!(credentials.aws_access_key_id(), "foo_access_key");
assert_eq!(credentials.aws_secret_access_key(), "foo_secret_key");
}
#[test]
fn parse_iam_task_credentials_sample_response() {
fn read_file_to_string(file_path: &Path) -> String {
match fs::metadata(file_path) {
Ok(metadata) => {
if !metadata.is_file() {
panic!("Couldn't open file");
}
}
Err(_) => panic!("Couldn't stat file"),
};
let mut file = File::open(file_path).unwrap();
let mut result = String::new();
file.read_to_string(&mut result).ok();
result
}
let response = read_file_to_string(Path::new(
"tests/sample-data/iam_task_credentials_sample_response",
));
let credentials = parse_credentials_from_aws_service(&response);
assert!(credentials.is_ok());
let credentials = credentials.unwrap();
assert_eq!(credentials.aws_access_key_id(), "AKIAIOSFODNN7EXAMPLE");
assert_eq!(
credentials.aws_secret_access_key(),
"wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY"
);
assert!(credentials.token().is_some());
assert_eq!(
credentials.expires_at().expect(""),
DateTime::parse_from_rfc3339("2016-11-18T01:50:39Z").expect("")
);
}
#[cfg(test)]
quickcheck! {
fn test_aws_credentials_secrets_not_in_debug(
key: String,
valid_for: Option<i64>,
token: Option<()>
) -> bool {
let creds = AwsCredentials::new(
key,
SECRET.to_owned(),
token.map(|_| test_utils::SECRET.to_owned()),
valid_for.map(|v| Utc::now() + ChronoDuration::seconds(v)),
);
is_secret_hidden_behind_asterisks(&creds)
}
}
}