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/*
This file is part of libmicrohttpd
Copyright (C) 2010, 2011, 2012 Daniel Pittman and Christian Grothoff
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file basicauth.c
* @brief Implements HTTP basic authentication methods
* @author Amr Ali
* @author Matthieu Speder
*/
#include "platform.h"
#include "mhd_limits.h"
#include "internal.h"
#include "base64.h"
#include "mhd_compat.h"
/**
* Beginning string for any valid Basic authentication header.
*/
#define _BASIC_BASE "Basic "
/**
* Get the username and password from the basic authorization header sent by the client
*
* @param connection The MHD connection structure
* @param password a pointer for the password
* @return NULL if no username could be found, a pointer
* to the username if found
* @ingroup authentication
*/
char *
MHD_basic_auth_get_username_password (struct MHD_Connection *connection,
char **password)
{
const char *header;
char *decode;
const char *separator;
char *user;
if ( (MHD_NO == MHD_lookup_connection_value_n (connection,
MHD_HEADER_KIND,
MHD_HTTP_HEADER_AUTHORIZATION,
MHD_STATICSTR_LEN_ (
MHD_HTTP_HEADER_AUTHORIZATION),
&header,
NULL)) ||
(0 != strncmp (header,
_BASIC_BASE,
MHD_STATICSTR_LEN_ (_BASIC_BASE))) )
return NULL;
header += MHD_STATICSTR_LEN_ (_BASIC_BASE);
if (NULL == (decode = BASE64Decode (header)))
{
#ifdef HAVE_MESSAGES
MHD_DLOG (connection->daemon,
_ ("Error decoding basic authentication.\n"));
#endif
return NULL;
}
/* Find user:password pattern */
if (NULL == (separator = strchr (decode,
':')))
{
#ifdef HAVE_MESSAGES
MHD_DLOG (connection->daemon,
_ ("Basic authentication doesn't contain ':' separator.\n"));
#endif
free (decode);
return NULL;
}
if (NULL == (user = strdup (decode)))
{
free (decode);
return NULL;
}
user[separator - decode] = '\0'; /* cut off at ':' */
if (NULL != password)
{
*password = strdup (separator + 1);
if (NULL == *password)
{
#ifdef HAVE_MESSAGES
MHD_DLOG (connection->daemon,
_ ("Failed to allocate memory for password.\n"));
#endif
free (decode);
free (user);
return NULL;
}
}
free (decode);
return user;
}
/**
* Queues a response to request basic authentication from the client
* The given response object is expected to include the payload for
* the response; the "WWW-Authenticate" header will be added and the
* response queued with the 'UNAUTHORIZED' status code.
*
* @param connection The MHD connection structure
* @param realm the realm presented to the client
* @param response response object to modify and queue; the NULL is tolerated
* @return #MHD_YES on success, #MHD_NO otherwise
* @ingroup authentication
*/
enum MHD_Result
MHD_queue_basic_auth_fail_response (struct MHD_Connection *connection,
const char *realm,
struct MHD_Response *response)
{
enum MHD_Result ret;
int res;
size_t hlen = strlen (realm) + strlen ("Basic realm=\"\"") + 1;
char *header;
if (NULL == response)
return MHD_NO;
header = (char *) malloc (hlen);
if (NULL == header)
{
#ifdef HAVE_MESSAGES
MHD_DLOG (connection->daemon,
"Failed to allocate memory for auth header.\n");
#endif /* HAVE_MESSAGES */
return MHD_NO;
}
res = MHD_snprintf_ (header,
hlen,
"Basic realm=\"%s\"",
realm);
if ((res > 0) && ((size_t) res < hlen))
ret = MHD_add_response_header (response,
MHD_HTTP_HEADER_WWW_AUTHENTICATE,
header);
else
ret = MHD_NO;
free (header);
if (MHD_NO != ret)
{
ret = MHD_queue_response (connection,
MHD_HTTP_UNAUTHORIZED,
response);
}
else
{
#ifdef HAVE_MESSAGES
MHD_DLOG (connection->daemon,
_ ("Failed to add Basic auth header.\n"));
#endif /* HAVE_MESSAGES */
}
return ret;
}
/* end of basicauth.c */
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