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/* validate.c --- Validate consistency of SCRAM tokens.
* Copyright (C) 2009-2022 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 prototypes. */
#include "validate.h"
/* Get strcmp, strlen. */
#include <string.h>
bool
scram_valid_client_first (struct scram_client_first *cf)
{
/* Check that cbflag is one of permitted values. */
switch (cf->cbflag)
{
case 'p':
case 'n':
case 'y':
break;
default:
return false;
}
/* Check that cbname is only set when cbflag is p. */
if (cf->cbflag == 'p' && cf->cbname == NULL)
return false;
else if (cf->cbflag != 'p' && cf->cbname != NULL)
return false;
if (cf->cbname)
{
const char *p = cf->cbname;
while (*p && strchr ("ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"abcdefghijklmnopqrstuvwxyz" "0123456789.-", *p))
p++;
if (*p)
return false;
}
/* We require a non-zero username string. */
if (cf->username == NULL || *cf->username == '\0')
return false;
/* We require a non-zero client nonce. */
if (cf->client_nonce == NULL || *cf->client_nonce == '\0')
return false;
/* Nonce cannot contain ','. */
if (strchr (cf->client_nonce, ','))
return false;
return true;
}
bool
scram_valid_server_first (struct scram_server_first *sf)
{
/* We require a non-zero nonce. */
if (sf->nonce == NULL || *sf->nonce == '\0')
return false;
/* Nonce cannot contain ','. */
if (strchr (sf->nonce, ','))
return false;
/* We require a non-zero salt. */
if (sf->salt == NULL || *sf->salt == '\0')
return false;
/* FIXME check that salt is valid base64. */
if (strchr (sf->salt, ','))
return false;
if (sf->iter == 0)
return false;
return true;
}
bool
scram_valid_client_final (struct scram_client_final *cl)
{
/* We require a non-zero cbind. */
if (cl->cbind == NULL || *cl->cbind == '\0')
return false;
/* FIXME check that cbind is valid base64. */
if (strchr (cl->cbind, ','))
return false;
/* We require a non-zero nonce. */
if (cl->nonce == NULL || *cl->nonce == '\0')
return false;
/* Nonce cannot contain ','. */
if (strchr (cl->nonce, ','))
return false;
/* We require a non-zero proof. */
if (cl->proof == NULL || *cl->proof == '\0')
return false;
/* FIXME check that proof is valid base64. */
if (strchr (cl->proof, ','))
return false;
return true;
}
bool
scram_valid_server_final (struct scram_server_final *sl)
{
/* We require a non-zero verifier. */
if (sl->verifier == NULL || *sl->verifier == '\0')
return false;
/* FIXME check that verifier is valid base64. */
if (strchr (sl->verifier, ','))
return false;
return true;
}
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