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/*
This file is part of libmicrohttpd
Copyright (C) 2010, 2011, 2012 Daniel Pittman and Christian Grothoff
Copyright (C) 2014-2022 Evgeny Grin (Karlson2k)
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
* @author Karlson2k (Evgeny Grin)
*/
#include "basicauth.h"
#include "gen_auth.h"
#include "platform.h"
#include "mhd_limits.h"
#include "internal.h"
#include "base64.h"
#include "mhd_compat.h"
/**
* Get request's Basic Authorisation parameters.
* @param connection the connection to process
* @return pointer to request Basic Authorisation parameters structure if
* request has such header (allocated in connection's pool),
* NULL otherwise.
*/
static const struct MHD_RqBAuth *
get_rq_bauth_params (struct MHD_Connection *connection)
{
const struct MHD_AuthRqHeader *rq_params;
rq_params = MHD_get_auth_rq_params_ (connection);
if ( (NULL == rq_params) ||
(MHD_AUTHTYPE_BASIC != rq_params->auth_type) )
return NULL;
return rq_params->params.bauth;
}
/**
* Get the username and password from the basic authorization header sent by the client
*
* @param connection The MHD connection structure
* @param[out] password a pointer for the password, free using #MHD_free().
* @return NULL if no username could be found, a pointer
* to the username if found, free using #MHD_free().
* @ingroup authentication
*/
_MHD_EXTERN char *
MHD_basic_auth_get_username_password (struct MHD_Connection *connection,
char **password)
{
const struct MHD_RqBAuth *params;
char *decode;
size_t decode_len;
const char *separator;
params = get_rq_bauth_params (connection);
if (NULL == params)
return NULL;
if ((NULL == params->token68.str) || (0 == params->token68.len))
return NULL;
decode = BASE64Decode (params->token68.str, params->token68.len, &decode_len);
if ((NULL == decode) || (0 == decode_len))
{
#ifdef HAVE_MESSAGES
MHD_DLOG (connection->daemon,
_ ("Error decoding basic authentication.\n"));
#endif
if (NULL != decode)
free (decode);
return NULL;
}
/* Find user:password pattern */
if (NULL != (separator = memchr (decode,
':',
decode_len)))
{
char *user;
size_t user_len;
size_t password_len;
user = decode; /* Reuse already allocated buffer */
user_len = (size_t) (separator - decode);
user[user_len] = 0;
if (NULL == password)
return user;
password_len = decode_len - user_len - 1;
*password = (char *) malloc (password_len + 1);
if (NULL != *password)
{
if (0 != password_len)
memcpy (*password, decode + user_len + 1, password_len);
(*password)[password_len] = 0;
return user;
}
#ifdef HAVE_MESSAGES
else
MHD_DLOG (connection->daemon,
_ ("Failed to allocate memory.\n"));
#endif /* HAVE_MESSAGES */
}
#ifdef HAVE_MESSAGES
else
MHD_DLOG (connection->daemon,
_ ("Basic authentication doesn't contain ':' separator.\n"));
#endif
free (decode);
return NULL;
}
/**
* 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
*/
_MHD_EXTERN 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) + MHD_STATICSTR_LEN_ ("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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