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/* printer.h --- Convert SCRAM token structures into strings.
* 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 "printer.h"
/* Get free. */
#include <stdlib.h>
/* Get asprintf. */
#include <stdio.h>
/* Get strdup. */
#include <string.h>
/* Get token validator. */
#include "validate.h"
static char *
scram_escape (const char *str)
{
char *out = malloc (strlen (str) * 3 + 1);
char *p = out;
if (!out)
return NULL;
while (*str)
{
if (*str == ',')
{
memcpy (p, "=2C", 3);
p += 3;
}
else if (*str == '=')
{
memcpy (p, "=3D", 3);
p += 3;
}
else
{
*p = *str;
p++;
}
str++;
}
*p = '\0';
return out;
}
/* Print SCRAM client-first token into newly allocated output string
OUT. Returns 0 on success, -1 on invalid token, and -2 on memory
allocation errors. */
int
scram_print_client_first (struct scram_client_first *cf, char **out)
{
char *username = NULL;
char *authzid = NULL;
int n;
/* Below we assume fields are sensible, so first verify that to
avoid crashes. */
if (!scram_valid_client_first (cf))
return -1;
/* Escape username and authzid. */
username = scram_escape (cf->username);
if (!username)
return -2;
if (cf->authzid)
{
authzid = scram_escape (cf->authzid);
if (!authzid)
return -2;
}
n = asprintf (out, "%c%s%s,%s%s,n=%s,r=%s",
cf->cbflag,
cf->cbflag == 'p' ? "=" : "",
cf->cbflag == 'p' ? cf->cbname : "",
authzid ? "a=" : "",
authzid ? authzid : "", username, cf->client_nonce);
free (username);
free (authzid);
if (n <= 0 || *out == NULL)
return -1;
return 0;
}
/* Print SCRAM server-first token into newly allocated output string
OUT. Returns 0 on success, -1 on invalid token, and -2 on memory
allocation errors. */
int
scram_print_server_first (struct scram_server_first *sf, char **out)
{
int n;
/* Below we assume fields are sensible, so first verify that to
avoid crashes. */
if (!scram_valid_server_first (sf))
return -1;
n = asprintf (out, "r=%s,s=%s,i=%lu",
sf->nonce, sf->salt, (unsigned long) sf->iter);
if (n <= 0 || *out == NULL)
return -1;
return 0;
}
/* Print SCRAM client-final token into newly allocated output string
OUT. Returns 0 on success, -1 on invalid token, and -2 on memory
allocation errors. */
int
scram_print_client_final (struct scram_client_final *cl, char **out)
{
int n;
/* Below we assume fields are sensible, so first verify that to
avoid crashes. */
if (!scram_valid_client_final (cl))
return -1;
n = asprintf (out, "c=%s,r=%s,p=%s", cl->cbind, cl->nonce, cl->proof);
if (n <= 0 || *out == NULL)
return -1;
return 0;
}
/* Print SCRAM server-final token into newly allocated output string
OUT. Returns 0 on success, -1 on invalid token, and -2 on memory
allocation errors. */
int
scram_print_server_final (struct scram_server_final *sl, char **out)
{
int n;
/* Below we assume fields are sensible, so first verify that to
avoid crashes. */
if (!scram_valid_server_final (sl))
return -1;
n = asprintf (out, "v=%s", sl->verifier);
if (n <= 0 || *out == NULL)
return -1;
return 0;
}
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