1/*
2     This file is part of libmicrohttpd
3     Copyright (C) 2010 Christian Grothoff (and other contributing authors)
4
5     This library is free software; you can redistribute it and/or
6     modify it under the terms of the GNU Lesser General Public
7     License as published by the Free Software Foundation; either
8     version 2.1 of the License, or (at your option) any later version.
9
10     This library is distributed in the hope that it will be useful,
11     but WITHOUT ANY WARRANTY; without even the implied warranty of
12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13     Lesser General Public License for more details.
14
15     You should have received a copy of the GNU Lesser General Public
16     License along with this library; if not, write to the Free Software
17     Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
18*/
19/**
20 * @file digest_auth_example.c
21 * @brief minimal example for how to use digest auth with libmicrohttpd
22 * @author Amr Ali
23 */
24
25#include "platform.h"
26#include <microhttpd.h>
27#include <stdlib.h>
28
29#define PAGE "<html><head><title>libmicrohttpd demo</title></head><body>Access granted</body></html>"
30
31#define DENIED "<html><head><title>libmicrohttpd demo</title></head><body>Access denied</body></html>"
32
33#define MY_OPAQUE_STR "11733b200778ce33060f31c9af70a870ba96ddd4"
34
35static int
36ahc_echo (void *cls,
37          struct MHD_Connection *connection,
38          const char *url,
39          const char *method,
40          const char *version,
41          const char *upload_data, size_t *upload_data_size, void **ptr)
42{
43  struct MHD_Response *response;
44  char *username;
45  const char *password = "testpass";
46  const char *realm = "test@example.com";
47  int ret;
48
49  username = MHD_digest_auth_get_username(connection);
50  if (username == NULL)
51    {
52      response = MHD_create_response_from_buffer(strlen (DENIED),
53						 DENIED,
54						 MHD_RESPMEM_PERSISTENT);
55      ret = MHD_queue_auth_fail_response(connection, realm,
56					 MY_OPAQUE_STR,
57					 response,
58					 MHD_NO);
59      MHD_destroy_response(response);
60      return ret;
61    }
62  ret = MHD_digest_auth_check(connection, realm,
63			      username,
64			      password,
65			      300);
66  free(username);
67  if ( (ret == MHD_INVALID_NONCE) ||
68       (ret == MHD_NO) )
69    {
70      response = MHD_create_response_from_buffer(strlen (DENIED),
71						 DENIED,
72						 MHD_RESPMEM_PERSISTENT);
73      if (NULL == response)
74	return MHD_NO;
75      ret = MHD_queue_auth_fail_response(connection, realm,
76					 MY_OPAQUE_STR,
77					 response,
78					 (ret == MHD_INVALID_NONCE) ? MHD_YES : MHD_NO);
79      MHD_destroy_response(response);
80      return ret;
81    }
82  response = MHD_create_response_from_buffer(strlen(PAGE), PAGE,
83					     MHD_RESPMEM_PERSISTENT);
84  ret = MHD_queue_response(connection, MHD_HTTP_OK, response);
85  MHD_destroy_response(response);
86  return ret;
87}
88
89int
90main (int argc, char *const *argv)
91{
92  int fd;
93  char rnd[8];
94  ssize_t len;
95  size_t off;
96  struct MHD_Daemon *d;
97
98  if (argc != 2)
99    {
100      printf ("%s PORT\n", argv[0]);
101      return 1;
102    }
103  fd = open("/dev/urandom", O_RDONLY);
104  if (-1 == fd)
105    {
106      fprintf (stderr, "Failed to open `%s': %s\n",
107	       "/dev/urandom",
108	       strerror (errno));
109      return 1;
110    }
111  off = 0;
112  while (off < 8)
113    {
114      len = read(fd, rnd, 8);
115      if (len == -1)
116	{
117	  fprintf (stderr, "Failed to read `%s': %s\n",
118		   "/dev/urandom",
119		   strerror (errno));
120	  (void) close (fd);
121	  return 1;
122	}
123      off += len;
124    }
125  (void) close(fd);
126  d = MHD_start_daemon (MHD_USE_THREAD_PER_CONNECTION | MHD_USE_DEBUG,
127                        atoi (argv[1]),
128                        NULL, NULL, &ahc_echo, PAGE,
129			MHD_OPTION_DIGEST_AUTH_RANDOM, sizeof(rnd), rnd,
130			MHD_OPTION_NONCE_NC_SIZE, 300,
131			MHD_OPTION_CONNECTION_TIMEOUT, (unsigned int) 120,
132			MHD_OPTION_END);
133  if (d == NULL)
134    return 1;
135  (void) getc (stdin);
136  MHD_stop_daemon (d);
137  return 0;
138}
139
140/* end of digest_auth_example.c */
141