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/* server.c --- Non-standard SASL mechanism LOGIN, 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 malloc, free. */
#include <stdlib.h>
/* Get strdup, strlen. */
#include <string.h>
/* Get specification. */
#include "login.h"
struct _Gsasl_login_server_state
{
int step;
char *username;
char *password;
};
#define CHALLENGE_USERNAME "User Name"
#define CHALLENGE_PASSWORD "Password"
int
_gsasl_login_server_start (Gsasl_session * sctx _GL_UNUSED, void **mech_data)
{
struct _Gsasl_login_server_state *state;
state = calloc (1, sizeof (*state));
if (state == NULL)
return GSASL_MALLOC_ERROR;
*mech_data = state;
return GSASL_OK;
}
int
_gsasl_login_server_step (Gsasl_session * sctx,
void *mech_data,
const char *input, size_t input_len,
char **output, size_t *output_len)
{
struct _Gsasl_login_server_state *state = mech_data;
int res;
switch (state->step)
{
case 0:
*output = strdup (CHALLENGE_USERNAME);
if (!*output)
return GSASL_MALLOC_ERROR;
*output_len = strlen (CHALLENGE_USERNAME);
state->step++;
res = GSASL_NEEDS_MORE;
break;
case 1:
if (input_len == 0)
return GSASL_MECHANISM_PARSE_ERROR;
state->username = strndup (input, input_len);
if (state->username == NULL)
return GSASL_MALLOC_ERROR;
if (input_len != strlen (state->username))
return GSASL_MECHANISM_PARSE_ERROR;
*output = strdup (CHALLENGE_PASSWORD);
if (!*output)
return GSASL_MALLOC_ERROR;
*output_len = strlen (CHALLENGE_PASSWORD);
state->step++;
res = GSASL_NEEDS_MORE;
break;
case 2:
if (input_len == 0)
return GSASL_MECHANISM_PARSE_ERROR;
state->password = strndup (input, input_len);
if (state->password == NULL)
return GSASL_MALLOC_ERROR;
if (input_len != strlen (state->password))
return GSASL_MECHANISM_PARSE_ERROR;
res = gsasl_property_set (sctx, GSASL_AUTHID, state->username);
if (res != GSASL_OK)
return res;
res = gsasl_property_set (sctx, GSASL_PASSWORD, state->password);
if (res != GSASL_OK)
return res;
res = gsasl_callback (NULL, sctx, GSASL_VALIDATE_SIMPLE);
if (res == GSASL_NO_CALLBACK)
{
const char *key;
gsasl_property_free (sctx, GSASL_AUTHZID);
gsasl_property_free (sctx, GSASL_PASSWORD);
key = gsasl_property_get (sctx, GSASL_PASSWORD);
if (key && strlen (state->password) == strlen (key) &&
strcmp (state->password, key) == 0)
res = GSASL_OK;
else
res = GSASL_AUTHENTICATION_ERROR;
}
*output_len = 0;
*output = NULL;
state->step++;
break;
default:
res = GSASL_MECHANISM_CALLED_TOO_MANY_TIMES;
break;
}
return res;
}
void
_gsasl_login_server_finish (Gsasl_session * sctx _GL_UNUSED, void *mech_data)
{
struct _Gsasl_login_server_state *state = mech_data;
if (!state)
return;
free (state->username);
free (state->password);
free (state);
}
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