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#pragma once
#include <base64.hpp>
#include <pam_authenticate.hpp>
#include <webassets.hpp>
#include <random>
#include <crow/app.h>
#include <crow/http_request.h>
#include <crow/http_response.h>
#include <boost/container/flat_set.hpp>
namespace crow {
namespace TokenAuthorization {
struct User {};
using random_bytes_engine =
std::independent_bits_engine<std::random_device, CHAR_BIT, unsigned char>;
class Middleware {
public:
Middleware() {
for (auto& route : crow::webassets::routes) {
allowed_routes.emplace(route);
}
allowed_routes.emplace("/login");
};
struct context {};
void before_handle(crow::request& req, response& res, context& ctx) {
auto return_unauthorized = [&req, &res]() {
res.code = 401;
res.end();
};
if (allowed_routes.find(req.url.c_str()) != allowed_routes.end()) {
// TODO this is total hackery to allow the login page to work before the
// user is authenticated. Also, it will be quite slow for all pages
// instead of a one time hit for the whitelist entries. Ideally, this
// should be done in the url router handler, with tagged routes for the
// whitelist entries. Another option would be to whitelist a minimal form
// based page that didn't load the full angular UI until after login
} else {
// Normal, non login, non static file request
// Check for an authorization header, reject if not present
std::string auth_key;
if (req.headers.count("Authorization") == 1) {
std::string auth_header = req.get_header_value("Authorization");
// If the user is attempting any kind of auth other than token, reject
if (!boost::starts_with(auth_header, "Token ")) {
return_unauthorized();
return;
}
auth_key = auth_header.substr(6);
} else {
int count = req.headers.count("Cookie");
if (count == 1) {
auto& cookie_value = req.get_header_value("Cookie");
auto start_index = cookie_value.find("SESSION=");
if (start_index != std::string::npos) {
start_index += 8;
auto end_index = cookie_value.find(";", start_index);
if (end_index == std::string::npos) {
end_index = cookie_value.size() - 1;
}
auth_key =
cookie_value.substr(start_index, end_index - start_index + 1);
}
}
}
if (auth_key.empty()) {
res.code = 400;
res.end();
return;
}
std::cout << "auth_key=" << auth_key << "\n";
for (auto& token : this->auth_tokens) {
std::cout << "token=" << token << "\n";
}
// TODO(ed), use span here instead of constructing a new string
if (this->auth_tokens.find(auth_key) == this->auth_tokens.end()) {
return_unauthorized();
return;
}
if (req.url == "/logout") {
this->auth_tokens.erase(auth_key);
res.code = 200;
res.end();
return;
}
// else let the request continue unharmed
}
}
void after_handle(request& req, response& res, context& ctx) {
// Do nothing
}
boost::container::flat_set<std::string> auth_tokens;
boost::container::flat_set<std::string> allowed_routes;
random_bytes_engine rbe;
};
// TODO(ed) see if there is a better way to allow middlewares to request routes.
// Possibly an init function on first construction?
template <typename... Middlewares>
void request_routes(Crow<Middlewares...>& app) {
static_assert(black_magic::contains<TokenAuthorization::Middleware,
Middlewares...>::value,
"TokenAuthorization middleware must be enabled in app to use "
"auth routes");
CROW_ROUTE(app, "/login")
.methods(
"POST"_method)([&](const crow::request& req, crow::response& res) {
std::string content_type;
auto content_type_it = req.headers.find("content-type");
if (content_type_it != req.headers.end()) {
content_type = content_type_it->second;
boost::algorithm::to_lower(content_type);
}
std::string username;
std::string password;
bool looks_like_ibm = false;
// Check if auth was provided by a payload
if (content_type == "application/json") {
try {
auto login_credentials = nlohmann::json::parse(req.body);
// check for username/password in the root object
// THis method is how intel APIs authenticate
auto user_it = login_credentials.find("username");
auto pass_it = login_credentials.find("password");
if (user_it != login_credentials.end() &&
pass_it != login_credentials.end()) {
username = user_it->get<const std::string>();
password = pass_it->get<const std::string>();
} else {
// Openbmc appears to push a data object that contains the same
// keys (username and password), attempt to use that
auto data_it = login_credentials.find("data");
if (data_it != login_credentials.end()) {
// Some apis produce an array of value ["username", "password"]
if (data_it->is_array()) {
if (data_it->size() == 2) {
username = (*data_it)[0].get<const std::string>();
password = (*data_it)[1].get<const std::string>();
looks_like_ibm = true;
}
} else if (data_it->is_object()) {
auto user_it = data_it->find("username");
auto pass_it = data_it->find("password");
if (user_it != data_it->end() && pass_it != data_it->end()) {
username = user_it->get<const std::string>();
password = pass_it->get<const std::string>();
}
}
}
}
} catch (...) {
// TODO(ed) figure out how to not throw on a bad json parse
res.code = 400;
res.end();
return;
}
} else {
// check if auth was provided as a query string
auto user_it = req.headers.find("username");
auto pass_it = req.headers.find("password");
if (user_it != req.headers.end() && pass_it != req.headers.end()) {
username = user_it->second;
password = pass_it->second;
}
}
if (!username.empty() && !password.empty()) {
if (!pam_authenticate_user(username, password)) {
res.code = 401;
} else {
// THis should be a multiple of 3 to make sure that base64 doesn't
// end with an equals sign at the end. we could strip it off
// afterward
std::string token(30, 'a');
// TODO(ed) for some reason clang-tidy finds a divide by zero
// error in cstdlibc here commented out for now.
// Needs investigation
auto& m = app.template get_middleware<Middleware>();
std::generate(std::begin(token), std::end(token),
std::ref(m.rbe)); // NOLINT
std::string encoded_token;
if (!base64::base64_encode(token, encoded_token)) {
res.code = 500;
} else {
m.auth_tokens.insert(encoded_token);
if (looks_like_ibm) {
// IBM requires a very specific login structure, and doesn't
// actually look at the status code. TODO(ed).... Fix that
// upstream
nlohmann::json ret{
{"data", "User '" + username + "' logged in"},
{"message", "200 OK"},
{"status", "ok"}};
res.add_header(
"Set-Cookie",
"SESSION=" + encoded_token + "; Secure; HttpOnly");
res.write(ret.dump());
} else {
// if content type is json, assume json token
nlohmann::json ret{{"token", encoded_token}};
res.write(ret.dump());
res.add_header("Content-Type", "application/json");
}
}
}
} else {
res.code = 400;
}
res.end();
});
}
} // namespaec TokenAuthorization
} // namespace crow
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