mirror of
https://git.gnunet.org/libmicrohttpd.git
synced 2026-09-25 04:09:31 +03:00
185 lines
4.1 KiB
C
185 lines
4.1 KiB
C
#include <microhttpd.h>
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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#define PORT 8888
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#define REALM "\"Maintenance\""
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#define USER "a legitimate user"
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#define PASSWORD "and his password"
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char *string_to_base64 (const char *message);
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int
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ask_for_authentication (struct MHD_Connection *connection, const char *realm)
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{
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int ret;
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struct MHD_Response *response;
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char *headervalue;
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const char *strbase = "Basic realm=";
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response = MHD_create_response_from_data (0, NULL, MHD_NO, MHD_NO);
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if (!response)
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return MHD_NO;
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headervalue = malloc (strlen (strbase) + strlen (realm) + 1);
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if (!headervalue)
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return MHD_NO;
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strcpy (headervalue, strbase);
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strcat (headervalue, realm);
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ret = MHD_add_response_header (response, "WWW-Authenticate", headervalue);
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free (headervalue);
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if (!ret)
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{
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MHD_destroy_response (response);
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return MHD_NO;
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}
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ret = MHD_queue_response (connection, MHD_HTTP_UNAUTHORIZED, response);
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MHD_destroy_response (response);
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return ret;
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}
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int
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is_authenticated (struct MHD_Connection *connection,
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const char *username, const char *password)
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{
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const char *headervalue;
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char *expected_b64, *expected;
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const char *strbase = "Basic ";
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int authenticated;
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headervalue =
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MHD_lookup_connection_value (connection, MHD_HEADER_KIND,
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"Authorization");
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if (NULL == headervalue)
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return 0;
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if (0 != strncmp (headervalue, strbase, strlen (strbase)))
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return 0;
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expected = malloc (strlen (username) + 1 + strlen (password) + 1);
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if (NULL == expected)
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return 0;
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strcpy (expected, username);
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strcat (expected, ":");
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strcat (expected, password);
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expected_b64 = string_to_base64 (expected);
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if (NULL == expected_b64)
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return 0;
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strcpy (expected, strbase);
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authenticated =
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(strcmp (headervalue + strlen (strbase), expected_b64) == 0);
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free (expected_b64);
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return authenticated;
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}
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int
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secret_page (struct MHD_Connection *connection)
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{
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int ret;
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struct MHD_Response *response;
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const char *page = "<html><body>A secret.</body></html>";
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response =
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MHD_create_response_from_data (strlen (page), (void *) page, MHD_NO,
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MHD_NO);
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if (!response)
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return MHD_NO;
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ret = MHD_queue_response (connection, MHD_HTTP_OK, response);
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MHD_destroy_response (response);
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return ret;
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}
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int
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answer_to_connection (void *cls, struct MHD_Connection *connection,
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const char *url, const char *method,
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const char *version, const char *upload_data,
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unsigned int *upload_data_size, void **con_cls)
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{
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if (0 != strcmp (method, "GET"))
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return MHD_NO;
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if (NULL == *con_cls)
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{
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*con_cls = connection;
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return MHD_YES;
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}
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if (!is_authenticated (connection, USER, PASSWORD))
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return ask_for_authentication (connection, REALM);
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return secret_page (connection);
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}
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int
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main ()
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{
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struct MHD_Daemon *daemon;
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daemon = MHD_start_daemon (MHD_USE_SELECT_INTERNALLY, PORT, NULL, NULL,
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&answer_to_connection, NULL, MHD_OPTION_END);
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if (NULL == daemon)
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return 1;
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getchar ();
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MHD_stop_daemon (daemon);
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return 0;
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}
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char *
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string_to_base64 (const char *message)
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{
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const char *lookup =
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"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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unsigned long l;
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int i;
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char *tmp;
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size_t length = strlen (message);
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tmp = malloc (length * 2);
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if (NULL == tmp)
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return tmp;
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tmp[0] = 0;
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for (i = 0; i < length; i += 3)
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{
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l = (((unsigned long) message[i]) << 16)
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| (((i + 1) < length) ? (((unsigned long) message[i + 1]) << 8) : 0)
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| (((i + 2) < length) ? ((unsigned long) message[i + 2]) : 0);
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strncat (tmp, &lookup[(l >> 18) & 0x3F], 1);
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strncat (tmp, &lookup[(l >> 12) & 0x3F], 1);
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if (i + 1 < length)
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strncat (tmp, &lookup[(l >> 6) & 0x3F], 1);
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if (i + 2 < length)
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strncat (tmp, &lookup[l & 0x3F], 1);
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}
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if (length % 3)
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strncat (tmp, "===", 3 - length % 3);
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return tmp;
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}
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