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/* server.c --- SASL mechanism PLAIN as defined in RFC 2595, server side.
* Copyright (C) 2002-2022 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, write to the Free
* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
/* Get specification. */
#include "plain.h"
/* Get memcpy, memchr, strlen. */
#include <string.h>
/* Get malloc, free. */
#include <stdlib.h>
int
_gsasl_plain_server_step (Gsasl_session * sctx,
void *mech_data _GL_UNUSED,
const char *input, size_t input_len,
char **output, size_t *output_len)
{
const char *authzidptr = input;
char *authidptr = NULL;
char *passwordptr = NULL;
char *passwdz = NULL, *passprep = NULL, *authidprep = NULL;
int res;
*output_len = 0;
*output = NULL;
if (input_len == 0)
return GSASL_NEEDS_MORE;
/* Parse input. */
{
size_t tmplen;
authidptr = memchr (input, 0, input_len - 1);
if (authidptr)
{
authidptr++;
passwordptr = memchr (authidptr, 0, input_len - strlen (input) - 1);
if (passwordptr)
passwordptr++;
else
return GSASL_MECHANISM_PARSE_ERROR;
}
else
return GSASL_MECHANISM_PARSE_ERROR;
/* As the NUL (U+0000) character is used as a deliminator, the NUL
(U+0000) character MUST NOT appear in authzid, authcid, or passwd
productions. */
tmplen = input_len - (size_t) (passwordptr - input);
if (memchr (passwordptr, 0, tmplen))
return GSASL_MECHANISM_PARSE_ERROR;
}
/* Store authid, after preparing it... */
{
res = gsasl_saslprep (authidptr, GSASL_ALLOW_UNASSIGNED,
&authidprep, NULL);
if (res != GSASL_OK)
return res;
res = gsasl_property_set (sctx, GSASL_AUTHID, authidprep);
if (res != GSASL_OK)
return res;
/* Store authzid, if absent, use SASLprep(authcid). */
if (*authzidptr == '\0')
res = gsasl_property_set (sctx, GSASL_AUTHZID, authidprep);
else
res = gsasl_property_set (sctx, GSASL_AUTHZID, authzidptr);
if (res != GSASL_OK)
return res;
free (authidprep);
}
/* Store passwd, after preparing it... */
{
size_t passwdzlen = input_len - (size_t) (passwordptr - input);
/* Need to zero terminate password... */
passwdz = malloc (passwdzlen + 1);
if (passwdz == NULL)
return GSASL_MALLOC_ERROR;
memcpy (passwdz, passwordptr, passwdzlen);
passwdz[passwdzlen] = '\0';
res = gsasl_saslprep (passwdz, GSASL_ALLOW_UNASSIGNED, &passprep, NULL);
free (passwdz);
if (res != GSASL_OK)
return res;
res = gsasl_property_set (sctx, GSASL_PASSWORD, passprep);
if (res != GSASL_OK)
return res;
}
/* Authorization. Let application verify credentials internally,
but fall back to deal with it locally... */
res = gsasl_callback (NULL, sctx, GSASL_VALIDATE_SIMPLE);
if (res == GSASL_NO_CALLBACK)
{
const char *key;
char *normkey;
gsasl_property_free (sctx, GSASL_PASSWORD);
/* The following will invoke a GSASL_PASSWORD callback. */
key = gsasl_property_get (sctx, GSASL_PASSWORD);
if (!key)
{
free (passprep);
return GSASL_NO_PASSWORD;
}
/* Unassigned code points are not permitted. */
res = gsasl_saslprep (key, 0, &normkey, NULL);
if (res != GSASL_OK)
{
free (passprep);
return res;
}
if (strcmp (normkey, passprep) == 0)
res = GSASL_OK;
else
res = GSASL_AUTHENTICATION_ERROR;
free (normkey);
}
free (passprep);
return res;
}
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