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/*
* Copyright (C) 2015 Michael Brown <mbrown@fensystems.co.uk>.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or any later version.
*
* This program 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
* You can also choose to distribute this program under the terms of
* the Unmodified Binary Distribution Licence (as given in the file
* COPYING.UBDL), provided that you have satisfied its requirements.
*/
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
/**
* @file
*
* Hyper Text Transfer Protocol (HTTP) Basic authentication
*
*/
#include <stdio.h>
#include <errno.h>
#include <ipxe/uri.h>
#include <ipxe/base64.h>
#include <ipxe/http.h>
/* Disambiguate the various error causes */
#define EACCES_USERNAME __einfo_error ( EINFO_EACCES_USERNAME )
#define EINFO_EACCES_USERNAME \
__einfo_uniqify ( EINFO_EACCES, 0x01, \
"No username available for Basic authentication" )
/**
* Perform HTTP Basic authentication
*
* @v http HTTP transaction
* @ret rc Return status code
*/
static int http_basic_authenticate ( struct http_transaction *http ) {
struct http_request_auth *req = &http->request.auth;
/* Record username and password */
if ( ! http->uri->user ) {
DBGC ( http, "HTTP %p has no username for Basic "
"authentication\n", http );
return -EACCES_USERNAME;
}
req->username = http->uri->user;
req->password = ( http->uri->password ? http->uri->password : "" );
return 0;
}
/**
* Construct HTTP "Authorization" header for Basic authentication
*
* @v http HTTP transaction
* @v buf Buffer
* @v len Length of buffer
* @ret len Length of header value, or negative error
*/
static int http_format_basic_auth ( struct http_transaction *http,
char *buf, size_t len ) {
struct http_request_auth *req = &http->request.auth;
size_t user_pw_len = ( strlen ( req->username ) + 1 /* ":" */ +
strlen ( req->password ) );
char user_pw[ user_pw_len + 1 /* NUL */ ];
/* Sanity checks */
assert ( req->username != NULL );
assert ( req->password != NULL );
/* Construct "user:password" string */
snprintf ( user_pw, sizeof ( user_pw ), "%s:%s",
req->username, req->password );
/* Construct response */
return base64_encode ( user_pw, user_pw_len, buf, len );
}
/** HTTP Basic authentication scheme */
struct http_authentication http_basic_auth __http_authentication = {
.name = "Basic",
.authenticate = http_basic_authenticate,
.format = http_format_basic_auth,
};
/* Drag in HTTP authentication support */
REQUIRING_SYMBOL ( http_basic_auth );
REQUIRE_OBJECT ( httpauth );
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