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// Copyright 2017-2019 int08h LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#[cfg(feature = "gcpkms")]
pub mod inner {
extern crate base64;
extern crate google_cloudkms1 as cloudkms1;
extern crate hyper;
extern crate hyper_rustls;
extern crate yup_oauth2 as oauth2;
use std::default::Default;
use std::env;
use std::path::Path;
use std::result::Result;
use self::cloudkms1::CloudKMS;
use self::cloudkms1::{DecryptRequest, EncryptRequest};
use self::hyper::net::HttpsConnector;
use self::hyper::status::StatusCode;
use self::hyper_rustls::TlsClient;
use self::oauth2::{ServiceAccountAccess, ServiceAccountKey};
use crate::kms::{EncryptedDEK, KmsError, KmsProvider, PlaintextDEK, AD};
const GOOGLE_APP_CREDS: &str = &"GOOGLE_APPLICATION_CREDENTIALS";
/// Google Cloud Key Management Service
/// https://cloud.google.com/kms/
pub struct GcpKms {
key_resource_id: String,
service_account: ServiceAccountKey,
}
impl GcpKms {
///
/// Create a new GcpKms from a Google Cloud KMS key resource ID of the form
/// `projects/*/locations/*/keyRings/*/cryptoKeys/*`
///
pub fn from_resource_id(resource_id: &str) -> Result<Self, KmsError> {
let svc_acct = load_gcp_credential()?;
Ok(GcpKms {
key_resource_id: resource_id.to_string(),
service_account: svc_acct,
})
}
fn new_hub(&self) -> CloudKMS<hyper::Client, ServiceAccountAccess<hyper::Client>> {
let client1 = hyper::Client::with_connector(HttpsConnector::new(TlsClient::new()));
let access = oauth2::ServiceAccountAccess::new(self.service_account.clone(), client1);
let client2 = hyper::Client::with_connector(HttpsConnector::new(TlsClient::new()));
CloudKMS::new(client2, access)
}
fn pretty_http_error(&self, resp: &hyper::client::Response) -> KmsError {
let code = resp.status;
let url = &resp.url;
KmsError::OperationFailed(format!("Response {} from {}", code, url))
}
}
impl KmsProvider for GcpKms {
fn encrypt_dek(&self, plaintext_dek: &PlaintextDEK) -> Result<EncryptedDEK, KmsError> {
let mut request = EncryptRequest::default();
request.plaintext = Some(base64::encode(plaintext_dek));
request.additional_authenticated_data = Some(base64::encode(AD));
let hub = self.new_hub();
let result = hub
.projects()
.locations_key_rings_crypto_keys_encrypt(request, &self.key_resource_id)
.doit();
match result {
Ok((http_resp, enc_resp)) => {
if http_resp.status == StatusCode::Ok {
let ciphertext = enc_resp.ciphertext.unwrap();
let ct = base64::decode(&ciphertext)?;
Ok(ct)
} else {
Err(self.pretty_http_error(&http_resp))
}
}
Err(e) => Err(KmsError::OperationFailed(format!("encrypt_dek() {:?}", e))),
}
}
fn decrypt_dek(&self, encrypted_dek: &EncryptedDEK) -> Result<PlaintextDEK, KmsError> {
let mut request = DecryptRequest::default();
request.ciphertext = Some(base64::encode(encrypted_dek));
request.additional_authenticated_data = Some(base64::encode(AD));
let hub = self.new_hub();
let result = hub
.projects()
.locations_key_rings_crypto_keys_decrypt(request, &self.key_resource_id)
.doit();
match result {
Ok((http_resp, enc_resp)) => {
if http_resp.status == StatusCode::Ok {
let plaintext = enc_resp.plaintext.unwrap();
let ct = base64::decode(&plaintext)?;
Ok(ct)
} else {
Err(self.pretty_http_error(&http_resp))
}
}
Err(e) => Err(KmsError::OperationFailed(format!("decrypt_dek() {:?}", e))),
}
}
}
/// Minimal implementation of Application Default Credentials.
/// https://cloud.google.com/docs/authentication/production
///
/// 1. Look for GOOGLE_APPLICATION_CREDENTIALS and load service account
/// credentials if found.
/// 2. If not, error
///
/// TODO attempt to load GCE default credentials from metadata server.
/// This will be a bearer token instead of service account credential.
fn load_gcp_credential() -> Result<ServiceAccountKey, KmsError> {
if let Ok(gac) = env::var(GOOGLE_APP_CREDS.to_string()) {
if Path::new(&gac).exists() {
match oauth2::service_account_key_from_file(&gac) {
Ok(svc_acct_key) => return Ok(svc_acct_key),
Err(e) => {
return Err(KmsError::InvalidConfiguration(format!(
"Can't load service account credential '{}': {:?}",
gac, e
)))
}
}
} else {
return Err(KmsError::InvalidConfiguration(format!(
"{} ='{}' does not exist",
GOOGLE_APP_CREDS, gac
)));
}
}
// TODO: call to GCE metadata service to get default credential from
// http://169.254.169.254/computeMetadata/v1/instance/service-accounts/default/token
panic!(
"Failed to load service account credential. Is {} set?",
GOOGLE_APP_CREDS
);
}
}
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