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123 lines
3.0 KiB
C++
123 lines
3.0 KiB
C++
/*
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* Copyright (c) 2014, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*
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*/
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#include <vector>
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#include <boost/algorithm/string/trim.hpp>
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#include <osquery/core.h>
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#include <osquery/tables.h>
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#include <osquery/filesystem.h>
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#include <osquery/logger.h>
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namespace osquery {
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namespace tables {
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const std::string kSystemCron = "/etc/crontab";
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const std::vector<std::string> kUserCronPaths = {
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"/var/at/tabs/", "/var/spool/cron/", "/var/spool/cron/crontabs/",
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};
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std::vector<std::string> cronFromFile(const std::string& path) {
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std::string content;
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std::vector<std::string> cron_lines;
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if (!isReadable(path).ok()) {
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return cron_lines;
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}
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if (!readFile(path, content).ok()) {
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return cron_lines;
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}
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auto lines = split(content, "\n");
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// Only populate the lines that are not comments or blank.
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for (auto& line : lines) {
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// Cheat and use a non-const iteration, to inline trim.
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boost::trim(line);
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if (line.size() > 0 && line.at(0) != '#') {
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cron_lines.push_back(line);
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}
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}
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return cron_lines;
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}
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void genCronLine(const std::string& path,
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const std::string& line,
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QueryData& results) {
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Row r;
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r["path"] = path;
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auto columns = split(line, " \t");
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size_t index = 0;
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auto iterator = columns.begin();
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for (; iterator != columns.end(); ++iterator) {
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if (index == 0) {
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if ((*iterator).at(0) == '@') {
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// If the first value is an 'at' then skip to the command.
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r["event"] = *iterator;
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index = 5;
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continue;
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}
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r["minute"] = *iterator;
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} else if (index == 1) {
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r["hour"] = *iterator;
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} else if (index == 2) {
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r["day_of_month"] = *iterator;
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} else if (index == 3) {
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r["month"] = *iterator;
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} else if (index == 4) {
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r["day_of_week"] = *iterator;
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} else if (index == 5) {
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r["command"] = *iterator;
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} else {
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// Long if switch to handle command breaks from space delim.
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r["command"] += " " + *iterator;
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}
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index++;
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}
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if (r["command"].size() == 0) {
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// The line was not well-formed, perhaps it was a variable?
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return;
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}
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results.push_back(r);
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}
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QueryData genCronTab(QueryContext& context) {
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QueryData results;
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auto system_lines = cronFromFile(kSystemCron);
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for (const auto& line : system_lines) {
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genCronLine(kSystemCron, line, results);
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}
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std::vector<std::string> user_crons;
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for (const auto cron_path : kUserCronPaths) {
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osquery::listFilesInDirectory(cron_path, user_crons);
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}
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// The user-based crons are identified by their path.
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for (const auto& user_path : user_crons) {
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auto user_lines = cronFromFile(user_path);
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for (const auto& line : user_lines) {
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genCronLine(user_path, line, results);
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}
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}
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return results;
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}
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}
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}
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