1 #pragma once
2 #include "http_request.hpp"
3 #include "http_response.hpp"
4 #include "http_utility.hpp"
5 
6 #include <boost/url/format.hpp>
7 #include <boost/url/url.hpp>
8 
9 namespace forward_unauthorized
10 {
11 
12 // NOLINTNEXTLINE(cppcoreguidelines-avoid-non-const-global-variables)
13 static bool hasWebuiRoute = false;
14 
15 inline void sendUnauthorized(std::string_view url,
16                              std::string_view xRequestedWith,
17                              std::string_view accept, crow::Response& res)
18 {
19     // If it's a browser connecting, don't send the HTTP authenticate
20     // header, to avoid possible CSRF attacks with basic auth
21     if (http_helpers::isContentTypeAllowed(
22             accept, http_helpers::ContentType::HTML, false /*allowWildcard*/))
23     {
24         // If we have a webui installed, redirect to that login page
25         if (hasWebuiRoute)
26         {
27             boost::urls::url forward = boost::urls::format("/?next={}#/login",
28                                                            url);
29             res.result(boost::beast::http::status::temporary_redirect);
30             res.addHeader(boost::beast::http::field::location,
31                           forward.buffer());
32             return;
33         }
34         // If we don't have a webui installed, just return an unauthorized
35         // body
36         res.result(boost::beast::http::status::unauthorized);
37         res.write(
38             "No authentication provided, and no login UI present to forward to.");
39         return;
40     }
41 
42     res.result(boost::beast::http::status::unauthorized);
43 
44     // XHR requests from a browser will set the X-Requested-With header when
45     // doing their requests, even though they might not be requesting html.
46     if (!xRequestedWith.empty())
47     {
48         return;
49     }
50     // if basic auth is disabled, don't propose it.
51     if (!persistent_data::SessionStore::getInstance()
52              .getAuthMethodsConfig()
53              .basic)
54     {
55         return;
56     }
57     res.addHeader(boost::beast::http::field::www_authenticate, "Basic");
58 }
59 } // namespace forward_unauthorized
60