aws_config/profile/credentials.rs
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/*
* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
* SPDX-License-Identifier: Apache-2.0
*/
//! Profile File Based Credential Providers
//!
//! Profile file based providers combine two pieces:
//!
//! 1. Parsing and resolution of the assume role chain
//! 2. A user-modifiable hashmap of provider name to provider.
//!
//! Profile file based providers first determine the chain of providers that will be used to load
//! credentials. After determining and validating this chain, a `Vec` of providers will be created.
//!
//! Each subsequent provider will provide boostrap providers to the next provider in order to load
//! the final credentials.
//!
//! This module contains two sub modules:
//! - `repr` which contains an abstract representation of a provider chain and the logic to
//! build it from `~/.aws/credentials` and `~/.aws/config`.
//! - `exec` which contains a chain representation of providers to implement passing bootstrapped credentials
//! through a series of providers.
use crate::profile::cell::ErrorTakingOnceCell;
#[allow(deprecated)]
use crate::profile::profile_file::ProfileFiles;
use crate::profile::Profile;
use crate::profile::ProfileFileLoadError;
use crate::provider_config::ProviderConfig;
use aws_credential_types::{
provider::{self, error::CredentialsError, future, ProvideCredentials},
Credentials,
};
use aws_smithy_types::error::display::DisplayErrorContext;
use aws_types::SdkConfig;
use std::borrow::Cow;
use std::collections::HashMap;
use std::error::Error;
use std::fmt::{Display, Formatter};
use std::sync::Arc;
use tracing::Instrument;
mod exec;
pub(crate) mod repr;
/// AWS Profile based credentials provider
///
/// This credentials provider will load credentials from `~/.aws/config` and `~/.aws/credentials`.
/// The locations of these files are configurable via environment variables, see [below](#location-of-profile-files).
///
/// Generally, this will be constructed via the default provider chain, however, it can be manually
/// constructed with the builder:
/// ```rust,no_run
/// use aws_config::profile::ProfileFileCredentialsProvider;
/// let provider = ProfileFileCredentialsProvider::builder().build();
/// ```
///
/// _Note: Profile providers, when called, will load and parse the profile from the file system
/// only once. Parsed file contents will be cached indefinitely._
///
/// This provider supports several different credentials formats:
/// ### Credentials defined explicitly within the file
/// ```ini
/// [default]
/// aws_access_key_id = 123
/// aws_secret_access_key = 456
/// ```
///
/// ### Assume Role Credentials loaded from a credential source
/// ```ini
/// [default]
/// role_arn = arn:aws:iam::123456789:role/RoleA
/// credential_source = Environment
/// ```
///
/// NOTE: Currently only the `Environment` credential source is supported although it is possible to
/// provide custom sources:
/// ```no_run
/// use aws_credential_types::provider::{self, future, ProvideCredentials};
/// use aws_config::profile::ProfileFileCredentialsProvider;
/// #[derive(Debug)]
/// struct MyCustomProvider;
/// impl MyCustomProvider {
/// async fn load_credentials(&self) -> provider::Result {
/// todo!()
/// }
/// }
///
/// impl ProvideCredentials for MyCustomProvider {
/// fn provide_credentials<'a>(&'a self) -> future::ProvideCredentials where Self: 'a {
/// future::ProvideCredentials::new(self.load_credentials())
/// }
/// }
/// # if cfg!(feature = "rustls") {
/// let provider = ProfileFileCredentialsProvider::builder()
/// .with_custom_provider("Custom", MyCustomProvider)
/// .build();
/// }
/// ```
///
/// ### Assume role credentials from a source profile
/// ```ini
/// [default]
/// role_arn = arn:aws:iam::123456789:role/RoleA
/// source_profile = base
///
/// [profile base]
/// aws_access_key_id = 123
/// aws_secret_access_key = 456
/// ```
///
/// Other more complex configurations are possible, consult `test-data/assume-role-tests.json`.
///
/// ### Credentials loaded from an external process
/// ```ini
/// [default]
/// credential_process = /opt/bin/awscreds-custom --username helen
/// ```
///
/// An external process can be used to provide credentials.
///
/// ### Loading Credentials from SSO
/// ```ini
/// [default]
/// sso_start_url = https://example.com/start
/// sso_region = us-east-2
/// sso_account_id = 123456789011
/// sso_role_name = readOnly
/// region = us-west-2
/// ```
///
/// SSO can also be used as a source profile for assume role chains.
///
#[doc = include_str!("location_of_profile_files.md")]
#[derive(Debug)]
pub struct ProfileFileCredentialsProvider {
config: Arc<Config>,
inner_provider: ErrorTakingOnceCell<ChainProvider, CredentialsError>,
}
#[derive(Debug)]
struct Config {
factory: exec::named::NamedProviderFactory,
sdk_config: SdkConfig,
provider_config: ProviderConfig,
}
impl ProfileFileCredentialsProvider {
/// Builder for this credentials provider
pub fn builder() -> Builder {
Builder::default()
}
async fn load_credentials(&self) -> provider::Result {
// The inner provider needs to be cached across successive calls to load_credentials
// since the base providers can potentially have information cached in their instances.
// For example, the SsoCredentialsProvider maintains an in-memory expiring token cache.
let inner_provider = self
.inner_provider
.get_or_init(
{
let config = self.config.clone();
move || async move {
match build_provider_chain(config.clone()).await {
Ok(chain) => Ok(ChainProvider {
config: config.clone(),
chain: Some(Arc::new(chain)),
}),
Err(err) => match err {
ProfileFileError::NoProfilesDefined
| ProfileFileError::ProfileDidNotContainCredentials { .. } => {
Ok(ChainProvider {
config: config.clone(),
chain: None,
})
}
_ => Err(CredentialsError::invalid_configuration(format!(
"ProfileFile provider could not be built: {}",
&err
))),
},
}
}
},
CredentialsError::unhandled(
"profile file credentials provider initialization error already taken",
),
)
.await?;
inner_provider.provide_credentials().await
}
}
impl ProvideCredentials for ProfileFileCredentialsProvider {
fn provide_credentials<'a>(&'a self) -> future::ProvideCredentials<'a>
where
Self: 'a,
{
future::ProvideCredentials::new(self.load_credentials())
}
}
/// An Error building a Credential source from an AWS Profile
#[derive(Debug)]
#[non_exhaustive]
pub enum ProfileFileError {
/// The profile was not a valid AWS profile
#[non_exhaustive]
InvalidProfile(ProfileFileLoadError),
/// No profiles existed (the profile was empty)
#[non_exhaustive]
NoProfilesDefined,
/// The profile did not contain any credential information
#[non_exhaustive]
ProfileDidNotContainCredentials {
/// The name of the profile
profile: String,
},
/// The profile contained an infinite loop of `source_profile` references
#[non_exhaustive]
CredentialLoop {
/// Vec of profiles leading to the loop
profiles: Vec<String>,
/// The next profile that caused the loop
next: String,
},
/// The profile was missing a credential source
#[non_exhaustive]
MissingCredentialSource {
/// The name of the profile
profile: String,
/// Error message
message: Cow<'static, str>,
},
/// The profile contained an invalid credential source
#[non_exhaustive]
InvalidCredentialSource {
/// The name of the profile
profile: String,
/// Error message
message: Cow<'static, str>,
},
/// The profile referred to a another profile by name that was not defined
#[non_exhaustive]
MissingProfile {
/// The name of the profile
profile: String,
/// Error message
message: Cow<'static, str>,
},
/// The profile referred to `credential_source` that was not defined
#[non_exhaustive]
UnknownProvider {
/// The name of the provider
name: String,
},
/// Feature not enabled
#[non_exhaustive]
FeatureNotEnabled {
/// The feature or comma delimited list of features that must be enabled
feature: Cow<'static, str>,
/// Additional information about the missing feature
message: Option<Cow<'static, str>>,
},
/// Missing sso-session section in config
#[non_exhaustive]
MissingSsoSession {
/// The name of the profile that specified `sso_session`
profile: String,
/// SSO session name
sso_session: String,
},
/// Invalid SSO configuration
#[non_exhaustive]
InvalidSsoConfig {
/// The name of the profile that the error originates in
profile: String,
/// Error message
message: Cow<'static, str>,
},
/// Profile is intended to be used in the token provider chain rather
/// than in the credentials chain.
#[non_exhaustive]
TokenProviderConfig {},
}
impl ProfileFileError {
fn missing_field(profile: &Profile, field: &'static str) -> Self {
ProfileFileError::MissingProfile {
profile: profile.name().to_string(),
message: format!("`{}` was missing", field).into(),
}
}
}
impl Error for ProfileFileError {
fn source(&self) -> Option<&(dyn Error + 'static)> {
match self {
ProfileFileError::InvalidProfile(err) => Some(err),
_ => None,
}
}
}
impl Display for ProfileFileError {
fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
match self {
ProfileFileError::InvalidProfile(err) => {
write!(f, "invalid profile: {}", err)
}
ProfileFileError::CredentialLoop { profiles, next } => write!(
f,
"profile formed an infinite loop. first we loaded {:?}, \
then attempted to reload {}",
profiles, next
),
ProfileFileError::MissingCredentialSource { profile, message } => {
write!(f, "missing credential source in `{}`: {}", profile, message)
}
ProfileFileError::InvalidCredentialSource { profile, message } => {
write!(f, "invalid credential source in `{}`: {}", profile, message)
}
ProfileFileError::MissingProfile { profile, message } => {
write!(f, "profile `{}` was not defined: {}", profile, message)
}
ProfileFileError::UnknownProvider { name } => write!(
f,
"profile referenced `{}` provider but that provider is not supported",
name
),
ProfileFileError::NoProfilesDefined => write!(f, "No profiles were defined"),
ProfileFileError::ProfileDidNotContainCredentials { profile } => write!(
f,
"profile `{}` did not contain credential information",
profile
),
ProfileFileError::FeatureNotEnabled { feature, message } => {
let message = message.as_deref().unwrap_or_default();
write!(
f,
"This behavior requires following cargo feature(s) enabled: {feature}. {message}",
)
}
ProfileFileError::MissingSsoSession {
profile,
sso_session,
} => {
write!(f, "sso-session named `{sso_session}` (referenced by profile `{profile}`) was not found")
}
ProfileFileError::InvalidSsoConfig { profile, message } => {
write!(f, "profile `{profile}` has invalid SSO config: {message}")
}
ProfileFileError::TokenProviderConfig { .. } => {
// TODO(https://github.com/awslabs/aws-sdk-rust/issues/703): Update error message once token support is added
write!(
f,
"selected profile will resolve an access token instead of credentials \
since it doesn't have `sso_account_id` and `sso_role_name` set. Access token \
support for services such as Code Catalyst hasn't been implemented yet and is \
being tracked in https://github.com/awslabs/aws-sdk-rust/issues/703"
)
}
}
}
}
/// Builder for [`ProfileFileCredentialsProvider`]
#[derive(Debug, Default)]
pub struct Builder {
provider_config: Option<ProviderConfig>,
profile_override: Option<String>,
#[allow(deprecated)]
profile_files: Option<ProfileFiles>,
custom_providers: HashMap<Cow<'static, str>, Arc<dyn ProvideCredentials>>,
}
impl Builder {
/// Override the configuration for the [`ProfileFileCredentialsProvider`]
///
/// # Examples
///
/// ```no_run
/// # async fn test() {
/// use aws_config::profile::ProfileFileCredentialsProvider;
/// use aws_config::provider_config::ProviderConfig;
/// let provider = ProfileFileCredentialsProvider::builder()
/// .configure(&ProviderConfig::with_default_region().await)
/// .build();
/// # }
/// ```
pub fn configure(mut self, provider_config: &ProviderConfig) -> Self {
self.provider_config = Some(provider_config.clone());
self
}
/// Adds a custom credential source
///
/// # Examples
///
/// ```no_run
/// use aws_credential_types::provider::{self, future, ProvideCredentials};
/// use aws_config::profile::ProfileFileCredentialsProvider;
/// #[derive(Debug)]
/// struct MyCustomProvider;
/// impl MyCustomProvider {
/// async fn load_credentials(&self) -> provider::Result {
/// todo!()
/// }
/// }
///
/// impl ProvideCredentials for MyCustomProvider {
/// fn provide_credentials<'a>(&'a self) -> future::ProvideCredentials where Self: 'a {
/// future::ProvideCredentials::new(self.load_credentials())
/// }
/// }
///
/// # if cfg!(feature = "rustls") {
/// let provider = ProfileFileCredentialsProvider::builder()
/// .with_custom_provider("Custom", MyCustomProvider)
/// .build();
/// # }
/// ```
pub fn with_custom_provider(
mut self,
name: impl Into<Cow<'static, str>>,
provider: impl ProvideCredentials + 'static,
) -> Self {
self.custom_providers
.insert(name.into(), Arc::new(provider));
self
}
/// Override the profile name used by the [`ProfileFileCredentialsProvider`]
pub fn profile_name(mut self, profile_name: impl Into<String>) -> Self {
self.profile_override = Some(profile_name.into());
self
}
/// Set the profile file that should be used by the [`ProfileFileCredentialsProvider`]
#[allow(deprecated)]
pub fn profile_files(mut self, profile_files: ProfileFiles) -> Self {
self.profile_files = Some(profile_files);
self
}
/// Builds a [`ProfileFileCredentialsProvider`]
pub fn build(self) -> ProfileFileCredentialsProvider {
let build_span = tracing::debug_span!("build_profile_provider");
let _enter = build_span.enter();
let conf = self
.provider_config
.unwrap_or_default()
.with_profile_config(self.profile_files, self.profile_override);
let mut named_providers = self.custom_providers.clone();
named_providers
.entry("Environment".into())
.or_insert_with(|| {
Arc::new(crate::environment::credentials::EnvironmentVariableCredentialsProvider::new_with_env(
conf.env(),
))
});
named_providers
.entry("Ec2InstanceMetadata".into())
.or_insert_with(|| {
Arc::new(
crate::imds::credentials::ImdsCredentialsProvider::builder()
.configure(&conf)
.build(),
)
});
named_providers
.entry("EcsContainer".into())
.or_insert_with(|| {
Arc::new(
crate::ecs::EcsCredentialsProvider::builder()
.configure(&conf)
.build(),
)
});
let factory = exec::named::NamedProviderFactory::new(named_providers);
ProfileFileCredentialsProvider {
config: Arc::new(Config {
factory,
sdk_config: conf.client_config(),
provider_config: conf,
}),
inner_provider: ErrorTakingOnceCell::new(),
}
}
}
async fn build_provider_chain(
config: Arc<Config>,
) -> Result<exec::ProviderChain, ProfileFileError> {
let profile_set = config
.provider_config
.try_profile()
.await
.map_err(|parse_err| ProfileFileError::InvalidProfile(parse_err.clone()))?;
let repr = repr::resolve_chain(profile_set)?;
tracing::info!(chain = ?repr, "constructed abstract provider from config file");
exec::ProviderChain::from_repr(&config.provider_config, repr, &config.factory)
}
#[derive(Debug)]
struct ChainProvider {
config: Arc<Config>,
chain: Option<Arc<exec::ProviderChain>>,
}
impl ChainProvider {
async fn provide_credentials(&self) -> Result<Credentials, CredentialsError> {
// Can't borrow `self` across an await point, or else we lose `Send` on the returned future
let config = self.config.clone();
let chain = self.chain.clone();
if let Some(chain) = chain {
let mut creds = match chain
.base()
.provide_credentials()
.instrument(tracing::debug_span!("load_base_credentials"))
.await
{
Ok(creds) => {
tracing::info!(creds = ?creds, "loaded base credentials");
creds
}
Err(e) => {
tracing::warn!(error = %DisplayErrorContext(&e), "failed to load base credentials");
return Err(CredentialsError::provider_error(e));
}
};
for provider in chain.chain().iter() {
let next_creds = provider
.credentials(creds, &config.sdk_config)
.instrument(tracing::debug_span!("load_assume_role", provider = ?provider))
.await;
match next_creds {
Ok(next_creds) => {
tracing::info!(creds = ?next_creds, "loaded assume role credentials");
creds = next_creds
}
Err(e) => {
tracing::warn!(provider = ?provider, "failed to load assume role credentials");
return Err(CredentialsError::provider_error(e));
}
}
}
Ok(creds)
} else {
Err(CredentialsError::not_loaded_no_source())
}
}
}
#[cfg(test)]
mod test {
use crate::profile::credentials::Builder;
use aws_credential_types::provider::ProvideCredentials;
macro_rules! make_test {
($name: ident) => {
#[tokio::test]
async fn $name() {
let _ = crate::test_case::TestEnvironment::from_dir(
concat!("./test-data/profile-provider/", stringify!($name)),
crate::test_case::test_credentials_provider(|config| async move {
Builder::default()
.configure(&config)
.build()
.provide_credentials()
.await
}),
)
.await
.unwrap()
.execute()
.await;
}
};
}
make_test!(e2e_assume_role);
make_test!(e2e_fips_and_dual_stack_sts);
make_test!(empty_config);
make_test!(retry_on_error);
make_test!(invalid_config);
make_test!(region_override);
// TODO(https://github.com/awslabs/aws-sdk-rust/issues/1117) This test is disabled on Windows because it uses Unix-style paths
#[cfg(all(feature = "credentials-process", not(windows)))]
make_test!(credential_process);
// TODO(https://github.com/awslabs/aws-sdk-rust/issues/1117) This test is disabled on Windows because it uses Unix-style paths
#[cfg(all(feature = "credentials-process", not(windows)))]
make_test!(credential_process_failure);
#[cfg(feature = "credentials-process")]
make_test!(credential_process_invalid);
#[cfg(feature = "sso")]
make_test!(sso_credentials);
#[cfg(feature = "sso")]
make_test!(sso_token);
}
#[cfg(all(test, feature = "sso"))]
mod sso_tests {
use crate::{profile::credentials::Builder, provider_config::ProviderConfig};
use aws_credential_types::provider::ProvideCredentials;
use aws_sdk_sso::config::RuntimeComponents;
use aws_smithy_runtime_api::client::{
http::{
HttpClient, HttpConnector, HttpConnectorFuture, HttpConnectorSettings,
SharedHttpConnector,
},
orchestrator::{HttpRequest, HttpResponse},
};
use aws_smithy_types::body::SdkBody;
use aws_types::os_shim_internal::{Env, Fs};
use std::collections::HashMap;
// TODO(https://github.com/awslabs/aws-sdk-rust/issues/1117) This test is ignored on Windows because it uses Unix-style paths
#[cfg_attr(windows, ignore)]
// In order to preserve the SSO token cache, the inner provider must only
// be created once, rather than once per credential resolution.
#[tokio::test]
async fn create_inner_provider_exactly_once() {
#[derive(Debug)]
struct ClientInner {
expected_token: &'static str,
}
impl HttpConnector for ClientInner {
fn call(&self, request: HttpRequest) -> HttpConnectorFuture {
assert_eq!(
self.expected_token,
request.headers().get("x-amz-sso_bearer_token").unwrap()
);
HttpConnectorFuture::ready(Ok(HttpResponse::new(
200.try_into().unwrap(),
SdkBody::from("{\"roleCredentials\":{\"accessKeyId\":\"ASIARTESTID\",\"secretAccessKey\":\"TESTSECRETKEY\",\"sessionToken\":\"TESTSESSIONTOKEN\",\"expiration\": 1651516560000}}"),
)))
}
}
#[derive(Debug)]
struct Client {
inner: SharedHttpConnector,
}
impl Client {
fn new(expected_token: &'static str) -> Self {
Self {
inner: SharedHttpConnector::new(ClientInner { expected_token }),
}
}
}
impl HttpClient for Client {
fn http_connector(
&self,
_settings: &HttpConnectorSettings,
_components: &RuntimeComponents,
) -> SharedHttpConnector {
self.inner.clone()
}
}
let fs = Fs::from_map({
let mut map = HashMap::new();
map.insert(
"/home/.aws/config".to_string(),
br#"
[profile default]
sso_session = dev
sso_account_id = 012345678901
sso_role_name = SampleRole
region = us-east-1
[sso-session dev]
sso_region = us-east-1
sso_start_url = https://d-abc123.awsapps.com/start
"#
.to_vec(),
);
map.insert(
"/home/.aws/sso/cache/34c6fceca75e456f25e7e99531e2425c6c1de443.json".to_string(),
br#"
{
"accessToken": "secret-access-token",
"expiresAt": "2199-11-14T04:05:45Z",
"refreshToken": "secret-refresh-token",
"clientId": "ABCDEFG323242423121312312312312312",
"clientSecret": "ABCDE123",
"registrationExpiresAt": "2199-03-06T19:53:17Z",
"region": "us-east-1",
"startUrl": "https://d-abc123.awsapps.com/start"
}
"#
.to_vec(),
);
map
});
let provider_config = ProviderConfig::empty()
.with_fs(fs.clone())
.with_env(Env::from_slice(&[("HOME", "/home")]))
.with_http_client(Client::new("secret-access-token"));
let provider = Builder::default().configure(&provider_config).build();
let first_creds = provider.provide_credentials().await.unwrap();
// Write to the token cache with an access token that won't match the fake client's
// expected access token, and thus, won't return SSO credentials.
fs.write(
"/home/.aws/sso/cache/34c6fceca75e456f25e7e99531e2425c6c1de443.json",
r#"
{
"accessToken": "NEW!!secret-access-token",
"expiresAt": "2199-11-14T04:05:45Z",
"refreshToken": "secret-refresh-token",
"clientId": "ABCDEFG323242423121312312312312312",
"clientSecret": "ABCDE123",
"registrationExpiresAt": "2199-03-06T19:53:17Z",
"region": "us-east-1",
"startUrl": "https://d-abc123.awsapps.com/start"
}
"#,
)
.await
.unwrap();
// Loading credentials will still work since the SSOTokenProvider should have only
// been created once, and thus, the correct token is still in an in-memory cache.
let second_creds = provider
.provide_credentials()
.await
.expect("used cached token instead of loading from the file system");
assert_eq!(first_creds, second_creds);
// Now create a new provider, which should use the new cached token value from the file system
// since it won't have the in-memory cache. We do this just to verify that the FS mutation above
// actually worked correctly.
let provider_config = ProviderConfig::empty()
.with_fs(fs.clone())
.with_env(Env::from_slice(&[("HOME", "/home")]))
.with_http_client(Client::new("NEW!!secret-access-token"));
let provider = Builder::default().configure(&provider_config).build();
let third_creds = provider.provide_credentials().await.unwrap();
assert_eq!(second_creds, third_creds);
}
}