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/**
* Copyright (C) 2019-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/platform/basic.h"
#include "mongo/client/sasl_aws_client_conversation.h"
#include <ctime>
#include <string>
#include "mongo/base/string_data.h"
#include "mongo/bson/json.h"
#include "mongo/bson/util/bson_extract.h"
#include "mongo/client/sasl_aws_client_options.h"
#include "mongo/client/sasl_aws_client_protocol.h"
#include "mongo/client/sasl_aws_client_protocol_gen.h"
#include "mongo/util/net/http_client.h"
namespace mongo {
namespace awsIam {
SASLAwsClientGlobalParams saslAwsClientGlobalParams;
} // namespace awsIam
namespace {
std::string getDefaultEC2Host() {
return awsIam::saslAwsClientGlobalParams.awsEC2InstanceMetadataUrl;
}
std::string getDefaultECSHost() {
return awsIam::saslAwsClientGlobalParams.awsECSInstanceMetadataUrl;
}
StringData toString(DataBuilder& builder) {
ConstDataRange cdr = builder.getCursor();
StringData str;
cdr.readInto<StringData>(&str);
return str;
}
} // namespace
SaslAWSClientConversation::SaslAWSClientConversation(SaslClientSession* saslClientSession)
: SaslClientConversation(saslClientSession) {}
awsIam::AWSCredentials SaslAWSClientConversation::_getCredentials() const {
if (_saslClientSession->hasParameter(SaslClientSession::parameterUser) &&
_saslClientSession->hasParameter(SaslClientSession::parameterPassword)) {
return _getUserCredentials();
} else {
return _getLocalAWSCredentials();
}
}
awsIam::AWSCredentials SaslAWSClientConversation::_getUserCredentials() const {
if (_saslClientSession->hasParameter(SaslClientSession::parameterAWSSessionToken)) {
return awsIam::AWSCredentials(
_saslClientSession->getParameter(SaslClientSession::parameterUser).toString(),
_saslClientSession->getParameter(SaslClientSession::parameterPassword).toString(),
_saslClientSession->getParameter(SaslClientSession::parameterAWSSessionToken)
.toString());
}
return awsIam::AWSCredentials(
_saslClientSession->getParameter(SaslClientSession::parameterUser).toString(),
_saslClientSession->getParameter(SaslClientSession::parameterPassword).toString());
}
awsIam::AWSCredentials SaslAWSClientConversation::_getLocalAWSCredentials() const {
// Check the environment variables
// These are set by AWS Lambda to pass in credentials and can be set by users.
StringData awsAccessKeyId = getenv("AWS_ACCESS_KEY_ID");
StringData awsSecretAccessKey = getenv("AWS_SECRET_ACCESS_KEY");
StringData awsSessionToken = getenv("AWS_SESSION_TOKEN");
if (!awsAccessKeyId.empty() && !awsSecretAccessKey.empty()) {
if (!awsSessionToken.empty()) {
return awsIam::AWSCredentials(awsAccessKeyId.toString(),
awsSecretAccessKey.toString(),
awsSessionToken.toString());
}
return awsIam::AWSCredentials(awsAccessKeyId.toString(), awsSecretAccessKey.toString());
}
StringData ecsMetadata = getenv("AWS_CONTAINER_CREDENTIALS_RELATIVE_URI");
if (!ecsMetadata.empty()) {
return _getEcsCredentials(ecsMetadata);
}
return _getEc2Credentials();
}
awsIam::AWSCredentials SaslAWSClientConversation::_getEc2Credentials() const {
try {
std::unique_ptr<HttpClient> httpClient = HttpClient::create();
// The local web server is just a normal HTTP server
httpClient->allowInsecureHTTP(true);
// Get the token for authenticating with Instance Metadata Version 2
// Set a lifetime of 30 seconds since we are only going to use this token for one set of
// requests.
std::vector<std::string> headers{"X-aws-ec2-metadata-token-ttl-seconds: 30", "Expect:"};
httpClient->setHeaders(headers);
DataBuilder getToken = httpClient->put(getDefaultEC2Host() + "/latest/api/token",
ConstDataRange(nullptr, nullptr));
StringData token = toString(getToken);
headers.clear();
headers.push_back("X-aws-ec2-metadata-token: " + token);
httpClient->setHeaders(headers);
// Retrieve the role attached to the EC2 instance
DataBuilder getRoleResult =
httpClient->get(getDefaultEC2Host() + "/latest/meta-data/iam/security-credentials/");
StringData getRoleOutput = toString(getRoleResult);
std::string role = awsIam::parseRoleFromEC2IamSecurityCredentials(getRoleOutput);
// Retrieve the temporary credentials of the EC2 instance
DataBuilder getRoleCredentialsResult = httpClient->get(
str::stream() << getDefaultEC2Host() + "/latest/meta-data/iam/security-credentials/"
<< role);
StringData getRoleCredentialsOutput = toString(getRoleCredentialsResult);
return awsIam::parseCredentialsFromEC2IamSecurityCredentials(getRoleCredentialsOutput);
} catch (const DBException& e) {
// Wrap exceptions from HTTP to make them clearer
uassertStatusOKWithContext(
e.toStatus(),
"Failed to retrieve EC2 Instance Metadata Service Credentials. Ensure there is a role "
"via an instance profile assigned to this machine.");
}
MONGO_UNREACHABLE;
}
awsIam::AWSCredentials SaslAWSClientConversation::_getEcsCredentials(StringData relativeUri) const {
try {
std::unique_ptr<HttpClient> httpClient = HttpClient::create();
// The local web server is just a normal HTTP server
httpClient->allowInsecureHTTP(true);
// Retrieve the security token attached to the ECS task
DataBuilder getRoleResult = httpClient->get(getDefaultECSHost() + relativeUri);
StringData getRoleOutput = toString(getRoleResult);
return awsIam::parseCredentialsFromECSTaskIamCredentials(getRoleOutput);
} catch (const DBException& e) {
// Wrap exceptions from HTTP to make them clearer
uassertStatusOKWithContext(e.toStatus(),
"Failed to retrieve ECS Tasks Metadata Credentials. Ensure "
"there is an execution role assigned to this ECS task.");
}
MONGO_UNREACHABLE;
}
StatusWith<bool> SaslAWSClientConversation::step(StringData inputData, std::string* outputData) {
if (_step > 2) {
return Status(ErrorCodes::AuthenticationFailed,
str::stream() << "Invalid AWS authentication step: " << _step);
}
_step++;
try {
if (_step == 1) {
return _firstStep(outputData);
}
return _secondStep(inputData, outputData);
} catch (...) {
return exceptionToStatus();
}
}
StatusWith<bool> SaslAWSClientConversation::_firstStep(std::string* outputData) {
*outputData = awsIam::generateClientFirst(&_clientNonce);
return false;
}
StatusWith<bool> SaslAWSClientConversation::_secondStep(StringData inputData,
std::string* outputData) {
auto credentials = _getCredentials();
*outputData = awsIam::generateClientSecond(inputData, _clientNonce, credentials);
return true;
}
} // namespace mongo
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