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#pragma once
#include <base64.hpp>
#include <pam_authenticate.hpp>
#include <persistent_data_middleware.hpp>
#include <webassets.hpp>
#include <random>
#include <crow/app.h>
#include <crow/http_request.h>
#include <crow/http_response.h>
#include <boost/bimap.hpp>
#include <boost/container/flat_set.hpp>
namespace crow {
namespace TokenAuthorization {
struct User {};
class Middleware {
public:
struct context {};
template <typename AllContext>
void before_handle(crow::request& req, response& res, context& ctx,
AllContext& allctx) {
auto return_unauthorized = [&req, &res]() {
res.code = 401;
res.end();
};
if (crow::webassets::routes.find(req.url) !=
crow::webassets::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 if (req.url == "/login" || req.url == "/redfish/v1" ||
req.url == "/redfish/v1/" ||
req.url == "/redfish/v1/$metadata" ||
(req.url == "/redfish/v1/SessionService/Sessions/" &&
req.method == "POST"_method)) {
} else {
// Normal, non login, non static file request
// Check for an authorization header, reject if not present
std::string auth_key;
bool require_csrf = true;
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);
require_csrf = false;
} else if (req.headers.count("X-Auth-Token") == 1) {
auth_key = req.get_header_value("X-Auth-Token");
require_csrf = false;
} 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();
}
auth_key =
cookie_value.substr(start_index, end_index - start_index);
}
}
require_csrf = true; // Cookies require CSRF
}
if (auth_key.empty()) {
res.code = 400;
res.end();
return;
}
auto& data_mw = allctx.template get<PersistentData::Middleware>();
auto session_it = data_mw.auth_tokens->find(auth_key);
if (session_it == data_mw.auth_tokens->end()) {
return_unauthorized();
return;
}
if (require_csrf) {
// RFC7231 defines methods that need csrf protection
if (req.method != "GET"_method) {
const std::string& csrf = req.get_header_value("X-XSRF-TOKEN");
// Make sure both tokens are filled
if (csrf.empty() || session_it->second.csrf_token.empty()) {
return_unauthorized();
return;
}
// Reject if csrf token not available
if (csrf != session_it->second.csrf_token) {
return_unauthorized();
return;
}
}
}
if (req.url == "/logout" && req.method == "POST"_method) {
data_mw.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> allowed_routes;
};
// 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<PersistentData::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") {
auto login_credentials =
nlohmann::json::parse(req.body, nullptr, false);
if (login_credentials.is_discarded()) {
res.code = 400;
res.end();
return;
}
// 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>();
}
}
}
}
} 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 {
auto& auth_middleware =
app.template get_middleware<PersistentData::Middleware>();
auto session = auth_middleware.generate_user_session(username);
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=" + session.session_token + "; Secure; HttpOnly");
res.add_header("Set-Cookie", "XSRF-TOKEN=" + session.csrf_token);
res.write(ret.dump());
} else {
// if content type is json, assume json token
nlohmann::json ret{{"token", session.session_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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