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/**
* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
* SPDX-License-Identifier: Apache-2.0.
*/
#include <aws/auth/signing.h>
#include <aws/auth/credentials.h>
#include <aws/auth/private/aws_signing.h>
#include <aws/io/uri.h>
/*
* Aws signing implementation
*/
static int s_aws_last_error_or_unknown(void) {
int last_error = aws_last_error();
if (last_error == AWS_ERROR_SUCCESS) {
last_error = AWS_ERROR_UNKNOWN;
}
return last_error;
}
static void s_perform_signing(struct aws_signing_state_aws *state) {
struct aws_signing_result *result = NULL;
if (state->error_code != AWS_ERROR_SUCCESS) {
goto done;
}
if (aws_credentials_is_anonymous(state->config.credentials)) {
result = &state->result;
goto done;
}
if (aws_signing_build_canonical_request(state)) {
state->error_code = s_aws_last_error_or_unknown();
AWS_LOGF_ERROR(
AWS_LS_AUTH_SIGNING,
"(id=%p) Signing failed to build canonical request via algorithm %s, error %d(%s)",
(void *)state->signable,
aws_signing_algorithm_to_string(state->config.algorithm),
state->error_code,
aws_error_debug_str(state->error_code));
goto done;
}
AWS_LOGF_INFO(
AWS_LS_AUTH_SIGNING,
"(id=%p) Signing successfully built canonical request for algorithm %s, with contents \n" PRInSTR "\n",
(void *)state->signable,
aws_signing_algorithm_to_string(state->config.algorithm),
AWS_BYTE_BUF_PRI(state->canonical_request));
if (aws_signing_build_string_to_sign(state)) {
state->error_code = s_aws_last_error_or_unknown();
AWS_LOGF_ERROR(
AWS_LS_AUTH_SIGNING,
"(id=%p) Signing failed to build string-to-sign via algorithm %s, error %d(%s)",
(void *)state->signable,
aws_signing_algorithm_to_string(state->config.algorithm),
state->error_code,
aws_error_debug_str(state->error_code));
goto done;
}
AWS_LOGF_INFO(
AWS_LS_AUTH_SIGNING,
"(id=%p) Signing successfully built string-to-sign via algorithm %s, with contents \n" PRInSTR "\n",
(void *)state->signable,
aws_signing_algorithm_to_string(state->config.algorithm),
AWS_BYTE_BUF_PRI(state->string_to_sign));
if (aws_signing_build_authorization_value(state)) {
state->error_code = s_aws_last_error_or_unknown();
AWS_LOGF_ERROR(
AWS_LS_AUTH_SIGNING,
"(id=%p) Signing failed to build final authorization value via algorithm %s",
(void *)state->signable,
aws_signing_algorithm_to_string(state->config.algorithm));
goto done;
}
result = &state->result;
done:
state->on_complete(result, state->error_code, state->userdata);
aws_signing_state_destroy(state);
}
static void s_aws_signing_on_get_credentials(struct aws_credentials *credentials, int error_code, void *user_data) {
struct aws_signing_state_aws *state = user_data;
if (!credentials) {
if (error_code == AWS_ERROR_SUCCESS) {
error_code = AWS_ERROR_UNKNOWN;
}
/* Log the credentials sourcing error */
AWS_LOGF_ERROR(
AWS_LS_AUTH_SIGNING,
"(id=%p) Credentials Provider failed to source credentials with error %d(%s)",
(void *)state->signable,
error_code,
aws_error_debug_str(error_code));
state->error_code = AWS_AUTH_SIGNING_NO_CREDENTIALS;
} else {
if (state->config.algorithm == AWS_SIGNING_ALGORITHM_V4_ASYMMETRIC &&
!aws_credentials_is_anonymous(credentials)) {
state->config.credentials = aws_credentials_new_ecc_from_aws_credentials(state->allocator, credentials);
if (state->config.credentials == NULL) {
state->error_code = AWS_AUTH_SIGNING_NO_CREDENTIALS;
}
} else {
state->config.credentials = credentials;
aws_credentials_acquire(credentials);
}
}
s_perform_signing(state);
}
int aws_sign_request_aws(
struct aws_allocator *allocator,
const struct aws_signable *signable,
const struct aws_signing_config_base *base_config,
aws_signing_complete_fn *on_complete,
void *userdata) {
AWS_PRECONDITION(base_config);
if (base_config->config_type != AWS_SIGNING_CONFIG_AWS) {
return aws_raise_error(AWS_AUTH_SIGNING_MISMATCHED_CONFIGURATION);
}
const struct aws_signing_config_aws *config = (void *)base_config;
struct aws_signing_state_aws *signing_state =
aws_signing_state_new(allocator, config, signable, on_complete, userdata);
if (!signing_state) {
return AWS_OP_ERR;
}
if (signing_state->config.algorithm == AWS_SIGNING_ALGORITHM_V4_ASYMMETRIC) {
if (signing_state->config.credentials != NULL &&
!aws_credentials_is_anonymous(signing_state->config.credentials)) {
/*
* If these are regular credentials, try to derive ecc-based ones
*/
if (aws_credentials_get_ecc_key_pair(signing_state->config.credentials) == NULL) {
struct aws_credentials *ecc_credentials =
aws_credentials_new_ecc_from_aws_credentials(allocator, signing_state->config.credentials);
aws_credentials_release(signing_state->config.credentials);
signing_state->config.credentials = ecc_credentials;
if (signing_state->config.credentials == NULL) {
goto on_error;
}
}
}
}
bool can_sign_immediately = signing_state->config.credentials != NULL;
if (can_sign_immediately) {
s_perform_signing(signing_state);
} else {
if (aws_credentials_provider_get_credentials(
signing_state->config.credentials_provider, s_aws_signing_on_get_credentials, signing_state)) {
goto on_error;
}
}
return AWS_OP_SUCCESS;
on_error:
aws_signing_state_destroy(signing_state);
return AWS_OP_ERR;
}
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