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/*
* Phusion Passenger - https://www.phusionpassenger.com/
* Copyright (c) 2015-2018 Phusion Holding B.V.
*
* "Passenger", "Phusion Passenger" and "Union Station" are registered
* trademarks of Phusion Holding B.V.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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*/
#ifndef _PASSENGER_API_ACCOUNT_UTILS_H_
#define _PASSENGER_API_ACCOUNT_UTILS_H_
#include <vector>
#include <string>
#include <cstddef>
#include <oxt/macros.hpp>
#include <boost/config.hpp>
#include <ConfigKit/ConfigKit.h>
#include <Exceptions.h>
#include <StaticString.h>
#include <FileTools/PathManip.h>
#include <Utils.h>
#include <StrIntTools/StrIntUtils.h>
namespace Passenger {
namespace ApiAccountUtils { // Avoid conflict with classes of the same name in ApiServerUtils.h, until we've migrated everything
using namespace std;
/*
* This file implements handling of API accounts.
*
* The various PassengerAgent ApiServers can be accessed through HTTP sockets.
* Authenticating and authorizating clients is handled through API accounts.
* Each ApiServer embeds an API account database. Each account contains a
* username, password and a privilege level.
*
* The API account and the API account database are represented by the
* `ApiAccount` and `ApiAccountDatabase` classes, respectively. Both of them
* are supposed to be used in an immutable manner.
*
* Users can specify API accounts in two formats:
*
* 1. Through a JSON array:
*
* [
* {
* "username": "foo",
*
* // One of these must exist:
* "password": "bar",
* "password_file": "/filename"
*
* "level": "readonly" | "full" // Optional; "full" is defeault
* },
* ...
* ]
*
* 2. Through a list of description strings, each in the form of:
*
* [LEVEL]:USERNAME:PASSWORDFILE
*
* LEVEL is one of:
*
* readonly Read-only access
* full Full access (default)
*
*
* This file contains three functions for operating on input supplied in
* one of the two formats (scroll down for descriptions):
*
* - validateAuthorizationsField() -- checks whether a JSON array conforms to the above format.
* - normalizeApiAccountJson() -- normalizes an item in the JSON array into a consistent format.
* - parseApiAccountDescription() -- parses a description string into a JSON object.
*
* An authorizations JSON array is considered *valid* if it passes `validateAuthorizationsField()`.
* An authorization JSON object is considered *normalized* if it conforms to the output format
* generated by `normalizeApiAccountJson()`.
*
* Valid and normalized are orthogonal concepts. One does not imply the other.
*/
inline Json::Value parseApiAccountDescription(const StaticString &description);
/**
* Checks whether an authorization JSON array conforms to the specified format.
*
* A JSON array that passes this function is *valid*, although not necessarily *normalized*.
*/
static void
validateAuthorizationsField(const string &key, const ConfigKit::Store &config,
vector<ConfigKit::Error> &outputErrors)
{
typedef ConfigKit::Error Error;
if (config[key].isNull()) {
return;
}
const Json::Value authorizations = config[key];
Json::Value::const_iterator it, end = authorizations.end();
vector<ConfigKit::Error> errors;
for (it = authorizations.begin(); it != end; it++) {
const Json::Value &auth = *it;
if (auth.isString()) {
try {
parseApiAccountDescription(auth.asString());
} catch (const ArgumentException &e) {
errors.push_back(Error("'{{" + key + "}}' contains an invalid authorization description ("
+ auth.asString() + "): " + e.what()));
}
} else if (auth.isObject()) {
if (auth.isMember("username")) {
if (!auth["username"].isString()) {
errors.push_back(Error("All usernames in '{{" + key + "}}' must be strings"));
} else if (auth["username"].asString() == "api") {
errors.push_back(Error("'{{" + key + "}}' may not contain an 'api' username"));
}
} else {
errors.push_back(Error("All objects in '{{" + key + "}}' must contain the 'username' key"));
}
if (auth.isMember("password")) {
if (!auth["password"].isString()) {
errors.push_back(Error("All passwords in '{{" + key + "}}' must be strings"));
}
if (auth.isMember("password_file")) {
errors.push_back(Error("Entries in '{{" + key + "}}' must contain either the"
" 'password' or the 'password_file' field, but not both"));
}
} else if (auth.isMember("password_file")) {
if (!auth["password_file"].isString()) {
errors.push_back(Error("All 'password_file' fields in '{{" + key + "}}' must be strings"));
}
} else {
errors.push_back(Error("All objects in '{{" + key + "}}' must contain either the"
" 'password' or 'password_file' key"));
}
if (auth.isMember("level")) {
if (!auth["level"].isString() || (
auth["level"].asString() != "readonly"
&& auth["level"].asString() != "full"))
{
errors.push_back(Error("All 'level' fields in '{{" + key + "}}' must be either"
" 'readonly' or 'full'"));
}
}
} else {
errors.push_back(Error("'{{" + key + "}}' may only contain strings or objects"));
}
}
errors = ConfigKit::deduplicateErrors(errors);
outputErrors.insert(outputErrors.end(), errors.begin(), errors.end());
}
/**
* Given a *valid* authorizations JSON array, this function
* turns that array into a consistent format.
*
* For example it ensures that, if the "level" field does
* not exist, it is inserted with the default value.
*/
inline Json::Value
normalizeApiAccountJson(const Json::Value &json) {
if (json.isString()) {
return parseApiAccountDescription(json.asString());
} else {
Json::Value doc = json;
if (json.isMember("password_file")) {
doc["password_file"] = absolutizePath(json["password_file"].asString());
}
if (!json.isMember("level")) {
doc["level"] = "full";
}
return doc;
}
}
inline Json::Value
normalizeApiAccountsJson(const Json::Value &json) {
Json::Value doc = json;
Json::Value::iterator it, end = doc.end();
for (it = doc.begin(); it != end; it++) {
*it = normalizeApiAccountJson(*it);
}
return doc;
}
/**
* Parses an API account description string into a *valid* (but not necessarily
* *normalized*) JSON object.
*
* @throws ArgumentException One of the input arguments contains a disallowed value.
*/
inline Json::Value
parseApiAccountDescription(const StaticString &description) {
Json::Value json;
vector<StaticString> args;
split(description, ':', args);
if (args.size() == 2) {
json["username"] = args[0].toString();
json["password_file"] = args[1].toString();
json["level"] = "full";
} else if (args.size() == 3) {
json["username"] = args[1].toString();
json["password_file"] = args[2].toString();
if (args[0] == "full" || args[0] == "readonly") {
json["level"] = args[0].toString();
} else {
throw ArgumentException("'level' field must be either 'full' or 'readonly'");
}
} else {
throw ArgumentException(string());
}
if (OXT_UNLIKELY(json["username"].asString() == "api")) {
throw ArgumentException("the username 'api' is not allowed");
}
return json;
}
struct ApiAccount {
string username;
string password;
bool readonly;
/**
* Constructs an ApiAccount.
*
* @params doc An *normalized* authorization JSON object.
*/
ApiAccount(const Json::Value &doc) {
username = doc["username"].asString();
if (doc.isMember("password")) {
password = doc["password"].asString();
} else {
password = strip(unsafeReadFile(doc["password_file"].asString()));
}
readonly = doc["level"].asString() == "readonly";
}
};
class ApiAccountDatabase {
private:
vector<ApiAccount> database;
public:
ApiAccountDatabase() { }
/**
* Constructs an ApiAccountDatabase.
*
* @param authorizations A *normalized* JSON array of authorization objects.
*/
ApiAccountDatabase(const Json::Value &authorizations) {
database.reserve(authorizations.size());
Json::Value::const_iterator it, end = authorizations.end();
for (it = authorizations.begin(); it != end; it++) {
const Json::Value &auth = *it;
database.push_back(ApiAccount(auth));
}
}
bool empty() const {
return database.empty();
}
const ApiAccount *lookup(const StaticString &username) const {
vector<ApiAccount>::const_iterator it, end = database.end();
for (it = database.begin(); it != end; it++) {
if (it->username == username) {
return &(*it);
}
}
return NULL;
}
void swap(ApiAccountDatabase &other) BOOST_NOEXCEPT_OR_NOTHROW {
database.swap(other.database);
}
};
} // namespace ApiAccountUtils
} // namespace Passenger
#endif /* _PASSENGER_API_ACCOUNT_UTILS_H_*/
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