103 lines
3.1 KiB
C
103 lines
3.1 KiB
C
/*
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* Copyright (C) 2015 Michael Brown <mbrown@fensystems.co.uk>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*
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* You can also choose to distribute this program under the terms of
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* the Unmodified Binary Distribution Licence (as given in the file
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* COPYING.UBDL), provided that you have satisfied its requirements.
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*/
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FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
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/**
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* @file
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*
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* Hyper Text Transfer Protocol (HTTP) Basic authentication
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*
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*/
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#include <stdio.h>
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#include <errno.h>
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#include <ipxe/uri.h>
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#include <ipxe/base64.h>
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#include <ipxe/http.h>
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/* Disambiguate the various error causes */
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#define EACCES_USERNAME __einfo_error ( EINFO_EACCES_USERNAME )
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#define EINFO_EACCES_USERNAME \
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__einfo_uniqify ( EINFO_EACCES, 0x01, \
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"No username available for Basic authentication" )
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/**
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* Perform HTTP Basic authentication
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*
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* @v http HTTP transaction
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* @ret rc Return status code
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*/
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static int http_basic_authenticate ( struct http_transaction *http ) {
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struct http_request_auth *req = &http->request.auth;
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/* Record username and password */
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if ( ! http->uri->user ) {
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DBGC ( http, "HTTP %p has no username for Basic "
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"authentication\n", http );
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return -EACCES_USERNAME;
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}
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req->username = http->uri->user;
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req->password = ( http->uri->password ? http->uri->password : "" );
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return 0;
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}
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/**
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* Construct HTTP "Authorization" header for Basic authentication
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*
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* @v http HTTP transaction
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* @v buf Buffer
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* @v len Length of buffer
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* @ret len Length of header value, or negative error
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*/
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static int http_format_basic_auth ( struct http_transaction *http,
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char *buf, size_t len ) {
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struct http_request_auth *req = &http->request.auth;
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size_t user_pw_len = ( strlen ( req->username ) + 1 /* ":" */ +
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strlen ( req->password ) );
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char user_pw[ user_pw_len + 1 /* NUL */ ];
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/* Sanity checks */
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assert ( req->username != NULL );
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assert ( req->password != NULL );
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/* Construct "user:password" string */
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snprintf ( user_pw, sizeof ( user_pw ), "%s:%s",
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req->username, req->password );
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/* Construct response */
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return base64_encode ( user_pw, user_pw_len, buf, len );
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}
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/** HTTP Basic authentication scheme */
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struct http_authentication http_basic_auth __http_authentication = {
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.name = "Basic",
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.authenticate = http_basic_authenticate,
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.format = http_format_basic_auth,
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};
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/* Drag in HTTP authentication support */
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REQUIRING_SYMBOL ( http_basic_auth );
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REQUIRE_OBJECT ( httpauth );
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