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/**
* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
* SPDX-License-Identifier: Apache-2.0.
*/
#include <aws/auth/aws_imds_client.h>
#include <aws/auth/credentials.h>
#include <aws/auth/private/credentials_utils.h>
#include <aws/common/string.h>
#if defined(_MSC_VER)
# pragma warning(disable : 4204)
#endif /* _MSC_VER */
struct aws_credentials_provider_imds_impl {
struct aws_imds_client *client;
};
static int s_credentials_provider_imds_get_credentials_async(
struct aws_credentials_provider *provider,
aws_on_get_credentials_callback_fn callback,
void *user_data);
static void s_on_imds_client_shutdown(void *user_data);
static void s_credentials_provider_imds_destroy(struct aws_credentials_provider *provider) {
struct aws_credentials_provider_imds_impl *impl = provider->impl;
if (impl == NULL) {
return;
}
if (impl->client) {
/* release IMDS client, cleanup will finish when its shutdown callback fires */
aws_imds_client_release(impl->client);
} else {
/* If provider setup failed halfway through, IMDS client might not exist.
* In this case invoke shutdown completion callback directly to finish cleanup */
s_on_imds_client_shutdown(provider);
}
}
static void s_on_imds_client_shutdown(void *user_data) {
struct aws_credentials_provider *provider = user_data;
aws_credentials_provider_invoke_shutdown_callback(provider);
aws_mem_release(provider->allocator, provider);
}
static struct aws_credentials_provider_vtable s_aws_credentials_provider_imds_vtable = {
.get_credentials = s_credentials_provider_imds_get_credentials_async,
.destroy = s_credentials_provider_imds_destroy,
};
struct aws_credentials_provider *aws_credentials_provider_new_imds(
struct aws_allocator *allocator,
const struct aws_credentials_provider_imds_options *options) {
if (!options->bootstrap) {
AWS_LOGF_ERROR(AWS_LS_AUTH_CREDENTIALS_PROVIDER, "Client bootstrap is required for querying IMDS");
aws_raise_error(AWS_ERROR_INVALID_ARGUMENT);
return NULL;
}
struct aws_credentials_provider *provider = NULL;
struct aws_credentials_provider_imds_impl *impl = NULL;
aws_mem_acquire_many(
allocator,
2,
&provider,
sizeof(struct aws_credentials_provider),
&impl,
sizeof(struct aws_credentials_provider_imds_impl));
if (!provider) {
return NULL;
}
AWS_ZERO_STRUCT(*provider);
AWS_ZERO_STRUCT(*impl);
aws_credentials_provider_init_base(provider, allocator, &s_aws_credentials_provider_imds_vtable, impl);
struct aws_imds_client_options client_options = {
.bootstrap = options->bootstrap,
.function_table = options->function_table,
.imds_version = options->imds_version,
.shutdown_options =
{
.shutdown_callback = s_on_imds_client_shutdown,
.shutdown_user_data = provider,
},
};
impl->client = aws_imds_client_new(allocator, &client_options);
if (!impl->client) {
goto on_error;
}
provider->shutdown_options = options->shutdown_options;
return provider;
on_error:
aws_credentials_provider_destroy(provider);
return NULL;
}
/*
* Tracking structure for each outstanding async query to an imds provider
*/
struct imds_provider_user_data {
/* immutable post-creation */
struct aws_allocator *allocator;
struct aws_credentials_provider *imds_provider;
aws_on_get_credentials_callback_fn *original_callback;
struct aws_byte_buf role;
void *original_user_data;
};
static void s_imds_provider_user_data_destroy(struct imds_provider_user_data *user_data) {
if (user_data == NULL) {
return;
}
aws_byte_buf_clean_up(&user_data->role);
aws_credentials_provider_release(user_data->imds_provider);
aws_mem_release(user_data->allocator, user_data);
}
static struct imds_provider_user_data *s_imds_provider_user_data_new(
struct aws_credentials_provider *imds_provider,
aws_on_get_credentials_callback_fn callback,
void *user_data) {
struct imds_provider_user_data *wrapped_user_data =
aws_mem_calloc(imds_provider->allocator, 1, sizeof(struct imds_provider_user_data));
if (wrapped_user_data == NULL) {
goto on_error;
}
if (aws_byte_buf_init(&wrapped_user_data->role, imds_provider->allocator, 100)) {
goto on_error;
}
wrapped_user_data->allocator = imds_provider->allocator;
wrapped_user_data->imds_provider = imds_provider;
aws_credentials_provider_acquire(imds_provider);
wrapped_user_data->original_user_data = user_data;
wrapped_user_data->original_callback = callback;
return wrapped_user_data;
on_error:
s_imds_provider_user_data_destroy(wrapped_user_data);
return NULL;
}
static void s_on_get_credentials(const struct aws_credentials *credentials, int error_code, void *user_data) {
(void)error_code;
struct imds_provider_user_data *wrapped_user_data = user_data;
wrapped_user_data->original_callback(
(struct aws_credentials *)credentials, error_code, wrapped_user_data->original_user_data);
s_imds_provider_user_data_destroy(wrapped_user_data);
}
static void s_on_get_role(const struct aws_byte_buf *role, int error_code, void *user_data) {
struct imds_provider_user_data *wrapped_user_data = user_data;
if (!role || error_code || role->len == 0) {
goto on_error;
}
struct aws_byte_cursor role_cursor = aws_byte_cursor_from_buf(role);
if (aws_byte_buf_append_dynamic(&wrapped_user_data->role, &role_cursor)) {
goto on_error;
}
struct aws_credentials_provider_imds_impl *impl = wrapped_user_data->imds_provider->impl;
if (aws_imds_client_get_credentials(
impl->client, aws_byte_cursor_from_buf(&wrapped_user_data->role), s_on_get_credentials, user_data)) {
goto on_error;
}
return;
on_error:
wrapped_user_data->original_callback(
NULL, AWS_AUTH_CREDENTIALS_PROVIDER_IMDS_SOURCE_FAILURE, wrapped_user_data->original_user_data);
s_imds_provider_user_data_destroy(wrapped_user_data);
}
static int s_credentials_provider_imds_get_credentials_async(
struct aws_credentials_provider *provider,
aws_on_get_credentials_callback_fn callback,
void *user_data) {
struct aws_credentials_provider_imds_impl *impl = provider->impl;
struct imds_provider_user_data *wrapped_user_data = s_imds_provider_user_data_new(provider, callback, user_data);
if (wrapped_user_data == NULL) {
goto error;
}
if (aws_imds_client_get_attached_iam_role(impl->client, s_on_get_role, wrapped_user_data)) {
goto error;
}
return AWS_OP_SUCCESS;
error:
s_imds_provider_user_data_destroy(wrapped_user_data);
return AWS_OP_ERR;
}
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