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/**
* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
* SPDX-License-Identifier: Apache-2.0.
*/
#include <aws/auth/signing_config.h>
#include <aws/auth/credentials.h>
const struct aws_byte_cursor g_aws_signed_body_value_empty_sha256 =
AWS_BYTE_CUR_INIT_FROM_STRING_LITERAL("e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855");
const struct aws_byte_cursor g_aws_signed_body_value_unsigned_payload =
AWS_BYTE_CUR_INIT_FROM_STRING_LITERAL("UNSIGNED-PAYLOAD");
const struct aws_byte_cursor g_aws_signed_body_value_streaming_unsigned_payload_trailer =
AWS_BYTE_CUR_INIT_FROM_STRING_LITERAL("STREAMING-UNSIGNED-PAYLOAD-TRAILER");
const struct aws_byte_cursor g_aws_signed_body_value_streaming_aws4_hmac_sha256_payload =
AWS_BYTE_CUR_INIT_FROM_STRING_LITERAL("STREAMING-AWS4-HMAC-SHA256-PAYLOAD");
const struct aws_byte_cursor g_aws_signed_body_value_streaming_aws4_hmac_sha256_payload_trailer =
AWS_BYTE_CUR_INIT_FROM_STRING_LITERAL("STREAMING-AWS4-HMAC-SHA256-PAYLOAD-TRAILER");
const struct aws_byte_cursor g_aws_signed_body_value_streaming_aws4_ecdsa_p256_sha256_payload =
AWS_BYTE_CUR_INIT_FROM_STRING_LITERAL("STREAMING-AWS4-ECDSA-P256-SHA256-PAYLOAD");
const struct aws_byte_cursor g_aws_signed_body_value_streaming_aws4_ecdsa_p256_sha256_payload_trailer =
AWS_BYTE_CUR_INIT_FROM_STRING_LITERAL("STREAMING-AWS4-ECDSA-P256-SHA256-PAYLOAD-TRAILER");
const struct aws_byte_cursor g_aws_signed_body_value_streaming_aws4_hmac_sha256_events =
AWS_BYTE_CUR_INIT_FROM_STRING_LITERAL("STREAMING-AWS4-HMAC-SHA256-EVENTS");
const char *aws_signing_algorithm_to_string(enum aws_signing_algorithm algorithm) {
switch (algorithm) {
case AWS_SIGNING_ALGORITHM_V4:
return "SigV4";
case AWS_SIGNING_ALGORITHM_V4_S3EXPRESS:
return "SigV4S3Express";
case AWS_SIGNING_ALGORITHM_V4_ASYMMETRIC:
return "SigV4Asymmetric";
default:
break;
}
return "Unknown";
}
int aws_validate_aws_signing_config_aws(const struct aws_signing_config_aws *config) {
if (config == NULL) {
AWS_LOGF_ERROR(AWS_LS_AUTH_SIGNING, "AWS signing config is null");
return aws_raise_error(AWS_AUTH_SIGNING_INVALID_CONFIGURATION);
}
if (config->signature_type == AWS_ST_HTTP_REQUEST_EVENT && config->algorithm != AWS_SIGNING_ALGORITHM_V4) {
/*
* Not supported yet.
*
* Need to determine if the Transcribe service supports Sigv4a and how to test it.
* Transcribe's examples are insufficient.
*/
AWS_LOGF_ERROR(AWS_LS_AUTH_SIGNING, "(id=%p) Event signing is only supported for Sigv4 yet", (void *)config);
return aws_raise_error(AWS_AUTH_SIGNING_INVALID_CONFIGURATION);
}
if (config->signature_type != AWS_ST_HTTP_REQUEST_HEADERS &&
config->signature_type != AWS_ST_HTTP_REQUEST_QUERY_PARAMS) {
/*
* If we're not signing the full request then it's critical that the credentials we're using are the same
* credentials used on the original request. If we're using a provider to fetch credentials then that is
* not guaranteed. For now, force users to always pass in credentials when signing events or chunks.
*
* The correct long-term solution would be to add a way to pass the credentials used in the initial
* signing back to the user in the completion callback. Then the user could supply those credentials
* to all subsequent chunk/event signings. The fact that we don't do that yet doesn't invalidate this check.
*/
if (config->credentials == NULL) {
AWS_LOGF_ERROR(
AWS_LS_AUTH_SIGNING,
"(id=%p) Chunk/event signing config must contain explicit credentials",
(void *)config);
return aws_raise_error(AWS_AUTH_SIGNING_INVALID_CONFIGURATION);
}
}
if (config->region.len == 0) {
AWS_LOGF_ERROR(AWS_LS_AUTH_SIGNING, "(id=%p) Signing config is missing a region identifier", (void *)config);
return aws_raise_error(AWS_AUTH_SIGNING_INVALID_CONFIGURATION);
}
if (config->service.len == 0) {
AWS_LOGF_ERROR(AWS_LS_AUTH_SIGNING, "(id=%p) Signing config is missing a service identifier", (void *)config);
return aws_raise_error(AWS_AUTH_SIGNING_INVALID_CONFIGURATION);
}
switch (config->algorithm) {
case AWS_SIGNING_ALGORITHM_V4:
if (config->credentials == NULL && config->credentials_provider == NULL) {
AWS_LOGF_ERROR(
AWS_LS_AUTH_SIGNING,
"(id=%p) Sigv4 signing config is missing a credentials provider or credentials",
(void *)config);
return aws_raise_error(AWS_AUTH_SIGNING_INVALID_CONFIGURATION);
}
if (config->credentials != NULL && !aws_credentials_is_anonymous(config->credentials)) {
if (aws_credentials_get_access_key_id(config->credentials).len == 0 ||
aws_credentials_get_secret_access_key(config->credentials).len == 0) {
AWS_LOGF_ERROR(
AWS_LS_AUTH_SIGNING,
"(id=%p) Sigv4 signing configured with invalid credentials",
(void *)config);
return aws_raise_error(AWS_AUTH_SIGNING_INVALID_CREDENTIALS);
}
}
break;
case AWS_SIGNING_ALGORITHM_V4_S3EXPRESS:
if (config->credentials == NULL && config->credentials_provider == NULL) {
AWS_LOGF_ERROR(
AWS_LS_AUTH_SIGNING,
"(id=%p) Sigv4 S3 Express signing config is missing a credentials provider or credentials",
(void *)config);
return aws_raise_error(AWS_AUTH_SIGNING_INVALID_CONFIGURATION);
}
if (config->credentials != NULL) {
if (aws_credentials_is_anonymous(config->credentials) ||
aws_credentials_get_access_key_id(config->credentials).len == 0 ||
aws_credentials_get_secret_access_key(config->credentials).len == 0 ||
aws_credentials_get_session_token(config->credentials).len == 0) {
AWS_LOGF_ERROR(
AWS_LS_AUTH_SIGNING,
"(id=%p) Sigv4 S3 Express signing configured with invalid credentials",
(void *)config);
return aws_raise_error(AWS_AUTH_SIGNING_INVALID_CREDENTIALS);
}
}
break;
case AWS_SIGNING_ALGORITHM_V4_ASYMMETRIC:
if (config->credentials == NULL && config->credentials_provider == NULL) {
AWS_LOGF_ERROR(
AWS_LS_AUTH_SIGNING,
"(id=%p) Sigv4 asymmetric signing config is missing a credentials provider or credentials",
(void *)config);
return aws_raise_error(AWS_AUTH_SIGNING_INVALID_CONFIGURATION);
}
break;
default:
return aws_raise_error(AWS_AUTH_SIGNING_INVALID_CONFIGURATION);
}
return AWS_OP_SUCCESS;
}
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