/lib/libmicrohttpd/doc/examples/basicauthentication.c
C | 182 lines | 137 code | 45 blank | 0 comment | 26 complexity | 665f3be6599bbbdc487b50c4b3ef89ef MD5 | raw file
- #include <platform.h>
- #include <microhttpd.h>
- #include <time.h>
- #define PORT 8888
- #define REALM "\"Maintenance\""
- #define USER "a legitimate user"
- #define PASSWORD "and his password"
- char *string_to_base64 (const char *message);
- int
- ask_for_authentication (struct MHD_Connection *connection, const char *realm)
- {
- int ret;
- struct MHD_Response *response;
- char *headervalue;
- const char *strbase = "Basic realm=";
- response = MHD_create_response_from_data (0, NULL, MHD_NO, MHD_NO);
- if (!response)
- return MHD_NO;
- headervalue = malloc (strlen (strbase) + strlen (realm) + 1);
- if (!headervalue)
- return MHD_NO;
- strcpy (headervalue, strbase);
- strcat (headervalue, realm);
- ret = MHD_add_response_header (response, "WWW-Authenticate", headervalue);
- free (headervalue);
- if (!ret)
- {
- MHD_destroy_response (response);
- return MHD_NO;
- }
- ret = MHD_queue_response (connection, MHD_HTTP_UNAUTHORIZED, response);
- MHD_destroy_response (response);
- return ret;
- }
- int
- is_authenticated (struct MHD_Connection *connection,
- const char *username, const char *password)
- {
- const char *headervalue;
- char *expected_b64, *expected;
- const char *strbase = "Basic ";
- int authenticated;
- headervalue =
- MHD_lookup_connection_value (connection, MHD_HEADER_KIND,
- "Authorization");
- if (NULL == headervalue)
- return 0;
- if (0 != strncmp (headervalue, strbase, strlen (strbase)))
- return 0;
- expected = malloc (strlen (username) + 1 + strlen (password) + 1);
- if (NULL == expected)
- return 0;
- strcpy (expected, username);
- strcat (expected, ":");
- strcat (expected, password);
- expected_b64 = string_to_base64 (expected);
- if (NULL == expected_b64)
- return 0;
- strcpy (expected, strbase);
- authenticated =
- (strcmp (headervalue + strlen (strbase), expected_b64) == 0);
- free (expected_b64);
- return authenticated;
- }
- int
- secret_page (struct MHD_Connection *connection)
- {
- int ret;
- struct MHD_Response *response;
- const char *page = "<html><body>A secret.</body></html>";
- response =
- MHD_create_response_from_data (strlen (page), (void *) page, MHD_NO,
- MHD_NO);
- if (!response)
- return MHD_NO;
- ret = MHD_queue_response (connection, MHD_HTTP_OK, response);
- MHD_destroy_response (response);
- return ret;
- }
- int
- answer_to_connection (void *cls, struct MHD_Connection *connection,
- const char *url, const char *method,
- const char *version, const char *upload_data,
- size_t *upload_data_size, void **con_cls)
- {
- if (0 != strcmp (method, "GET"))
- return MHD_NO;
- if (NULL == *con_cls)
- {
- *con_cls = connection;
- return MHD_YES;
- }
- if (!is_authenticated (connection, USER, PASSWORD))
- return ask_for_authentication (connection, REALM);
- return secret_page (connection);
- }
- int
- main ()
- {
- struct MHD_Daemon *daemon;
- daemon = MHD_start_daemon (MHD_USE_SELECT_INTERNALLY, PORT, NULL, NULL,
- &answer_to_connection, NULL, MHD_OPTION_END);
- if (NULL == daemon)
- return 1;
- getchar ();
- MHD_stop_daemon (daemon);
- return 0;
- }
- char *
- string_to_base64 (const char *message)
- {
- const char *lookup =
- "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
- unsigned long l;
- int i;
- char *tmp;
- size_t length = strlen (message);
- tmp = malloc (length * 2);
- if (NULL == tmp)
- return tmp;
- tmp[0] = 0;
- for (i = 0; i < length; i += 3)
- {
- l = (((unsigned long) message[i]) << 16)
- | (((i + 1) < length) ? (((unsigned long) message[i + 1]) << 8) : 0)
- | (((i + 2) < length) ? ((unsigned long) message[i + 2]) : 0);
- strncat (tmp, &lookup[(l >> 18) & 0x3F], 1);
- strncat (tmp, &lookup[(l >> 12) & 0x3F], 1);
- if (i + 1 < length)
- strncat (tmp, &lookup[(l >> 6) & 0x3F], 1);
- if (i + 2 < length)
- strncat (tmp, &lookup[l & 0x3F], 1);
- }
- if (length % 3)
- strncat (tmp, "===", 3 - length % 3);
- return tmp;
- }