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// Copyright 2017 Google Inc. All Rights Reserved.
//
// 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.
#define PAM_SM_ACCOUNT
#include <security/pam_appl.h>
#include <security/pam_modules.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <syslog.h>
#include <unistd.h>
#include <iostream>
#include <fstream>
#include <sstream>
#include <string>
#include "../compat.h"
#include "../utils/oslogin_utils.h"
using std::string;
using oslogin_utils::HttpGet;
using oslogin_utils::GetUser;
using oslogin_utils::kMetadataServerUrl;
using oslogin_utils::ParseJsonToKey;
using oslogin_utils::ParseJsonToEmail;
using oslogin_utils::ParseJsonToSuccess;
using oslogin_utils::UrlEncode;
using oslogin_utils::ValidateUserName;
static const char kSudoersDir[] = "/var/google-sudoers.d/";
extern "C" {
PAM_EXTERN int pam_sm_acct_mgmt(pam_handle_t *pamh, int flags, int argc,
const char **argv) {
// The return value for this module should generally be ignored. By default we
// will return PAM_SUCCESS.
int pam_result = PAM_SUCCESS;
const char *user_name;
if ((pam_result = pam_get_user(pamh, &user_name, NULL)) != PAM_SUCCESS) {
PAM_SYSLOG(pamh, LOG_INFO, "Could not get pam user.");
return pam_result;
}
if (!ValidateUserName(user_name)) {
// If the user name is not a valid oslogin user, don't bother continuing.
return PAM_SUCCESS;
}
string response;
if (!GetUser(user_name, &response)) {
return PAM_SUCCESS;
}
string email;
if (!ParseJsonToEmail(response, &email) || email.empty()) {
return PAM_SUCCESS;
}
std::stringstream url;
url << kMetadataServerUrl << "authorize?email=" << UrlEncode(email)
<< "&policy=adminLogin";
string filename = kSudoersDir;
filename.append(user_name);
struct stat buffer;
bool file_exists = !stat(filename.c_str(), &buffer);
long http_code;
if (HttpGet(url.str(), &response, &http_code) && http_code == 200 &&
ParseJsonToSuccess(response)) {
if (!file_exists) {
PAM_SYSLOG(pamh, LOG_INFO,
"Granting sudo permissions to organization user %s.",
user_name);
std::ofstream sudoers_file;
sudoers_file.open(filename.c_str());
sudoers_file << user_name << " ALL=(ALL) NOPASSWD: ALL"
<< "\n";
sudoers_file.close();
chown(filename.c_str(), 0, 0);
chmod(filename.c_str(), S_IRUSR | S_IRGRP);
}
} else if (file_exists) {
remove(filename.c_str());
}
return pam_result;
}
}
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