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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) authentication
*
*/
#include <stdio.h>
#include <strings.h>
#include <errno.h>
#include <ipxe/http.h>
/**
* Identify authentication scheme
*
* @v http HTTP transaction
* @v name Scheme name
* @ret auth Authentication scheme, or NULL
*/
static struct http_authentication * http_authentication ( const char *name ) {
struct http_authentication *auth;
/* Identify authentication scheme */
for_each_table_entry ( auth, HTTP_AUTHENTICATIONS ) {
if ( strcasecmp ( name, auth->name ) == 0 )
return auth;
}
return NULL;
}
/**
* Parse HTTP "WWW-Authenticate" header
*
* @v http HTTP transaction
* @v line Remaining header line
* @ret rc Return status code
*/
static int http_parse_www_authenticate ( struct http_transaction *http,
char *line ) {
struct http_authentication *auth;
char *name;
int rc;
/* Get scheme name */
name = http_token ( &line, NULL );
if ( ! name ) {
DBGC ( http, "HTTP %p malformed WWW-Authenticate \"%s\"\n",
http, line );
return -EPROTO;
}
/* Identify scheme */
auth = http_authentication ( name );
if ( ! auth ) {
DBGC ( http, "HTTP %p unrecognised authentication scheme "
"\"%s\"\n", http, name );
/* Ignore; the server may offer other schemes */
return 0;
}
/* Use first supported scheme */
if ( http->response.auth.auth )
return 0;
http->response.auth.auth = auth;
/* Parse remaining header line */
if ( ( rc = auth->parse ( http, line ) ) != 0 ) {
DBGC ( http, "HTTP %p could not parse %s WWW-Authenticate "
"\"%s\": %s\n", http, name, line, strerror ( rc ) );
return rc;
}
return 0;
}
/** HTTP "WWW-Authenticate" header */
struct http_response_header
http_response_www_authenticate __http_response_header = {
.name = "WWW-Authenticate",
.parse = http_parse_www_authenticate,
};
/**
* Construct HTTP "Authorization" header
*
* @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_authorization ( struct http_transaction *http,
char *buf, size_t len ) {
struct http_authentication *auth = http->request.auth.auth;
size_t used;
int auth_len;
int rc;
/* Do nothing unless we have an authentication scheme */
if ( ! auth )
return 0;
/* Construct header */
used = snprintf ( buf, len, "%s ", auth->name );
auth_len = auth->format ( http, ( buf + used ),
( ( used < len ) ? ( len - used ) : 0 ) );
if ( auth_len < 0 ) {
rc = auth_len;
return rc;
}
used += auth_len;
return used;
}
/** HTTP "Authorization" header */
struct http_request_header http_request_authorization __http_request_header = {
.name = "Authorization",
.format = http_format_authorization,
};
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