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/* server.c --- EXTERNAL mechanism as defined in RFC 2222, server side.
* Copyright (C) 2002-2025 Simon Josefsson
*
* This file is part of GNU SASL Library.
*
* GNU SASL 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.
*
* GNU SASL 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 GNU SASL Library; if not, see
* <https://www.gnu.org/licenses/>.
*
*/
#include <config.h>
/* Get specification. */
#include "external.h"
/* Get memchr. */
#include <string.h>
int
_gsasl_external_server_step (Gsasl_session *sctx,
void *mech_data _GL_UNUSED,
const char *input, size_t input_len,
char **output, size_t *output_len)
{
int rc;
*output_len = 0;
*output = NULL;
if (!input)
return GSASL_NEEDS_MORE;
/* Quoting rfc2222bis-09:
* extern-resp = *( UTF8-char-no-nul )
* UTF8-char-no-nul = UTF8-1-no-nul / UTF8-2 / UTF8-3 / UTF8-4
* UTF8-1-no-nul = %x01-7F */
if (memchr (input, '\0', input_len))
return GSASL_MECHANISM_PARSE_ERROR;
/* FIXME: Validate that input is UTF-8. */
if (input_len > 0)
rc = gsasl_property_set_raw (sctx, GSASL_AUTHZID, input, input_len);
else
rc = gsasl_property_set (sctx, GSASL_AUTHZID, NULL);
if (rc != GSASL_OK)
return rc;
return gsasl_callback (NULL, sctx, GSASL_VALIDATE_EXTERNAL);
}
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