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/* argon2.c - Password module for argon2 */
/* $OpenLDAP$ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
*
* Copyright 2017-2022 The OpenLDAP Foundation.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted only as authorized by the OpenLDAP
* Public License.
*
* A copy of this license is available in the file LICENSE in the
* top-level directory of the distribution or, alternatively, at
* <http://www.OpenLDAP.org/license.html>.
*/
#include "portable.h"
#ifdef SLAPD_PWMOD_PW_ARGON2
#include "ac/string.h"
#include "lber_pvt.h"
#include "lutil.h"
#include "slap.h"
#include <stdint.h>
#include <stdlib.h>
#ifdef HAVE_LIBARGON2
#include <argon2.h>
/*
* For now, we hardcode the default values from the argon2 command line tool
* (as of argon2 release 20161029)
*/
#define SLAPD_ARGON2_ITERATIONS 3
#define SLAPD_ARGON2_MEMORY (1 << 12)
#define SLAPD_ARGON2_PARALLELISM 1
#define SLAPD_ARGON2_SALT_LENGTH 16
#define SLAPD_ARGON2_HASH_LENGTH 32
#else /* !HAVE_LIBARGON2 */
#include <sodium.h>
/*
* Or libsodium interactive settings
*/
#define SLAPD_ARGON2_ITERATIONS crypto_pwhash_argon2id_OPSLIMIT_INTERACTIVE
#define SLAPD_ARGON2_MEMORY (crypto_pwhash_argon2id_MEMLIMIT_INTERACTIVE / 1024)
#define SLAPD_ARGON2_PARALLELISM 1
#define SLAPD_ARGON2_SALT_LENGTH crypto_pwhash_argon2id_SALTBYTES
#define SLAPD_ARGON2_HASH_LENGTH 32
#endif
static unsigned long iterations = SLAPD_ARGON2_ITERATIONS;
static unsigned long memory = SLAPD_ARGON2_MEMORY;
static unsigned long parallelism = SLAPD_ARGON2_PARALLELISM;
const struct berval slapd_argon2_scheme = BER_BVC("{ARGON2}");
static int
slapd_argon2_hash(
const struct berval *scheme,
const struct berval *passwd,
struct berval *hash,
const char **text )
{
/*
* Duplicate these values here so future code which allows
* configuration has an easier time.
*/
uint32_t salt_length, hash_length;
char *p;
int rc = LUTIL_PASSWD_ERR;
#ifdef HAVE_LIBARGON2
struct berval salt;
size_t encoded_length;
salt_length = SLAPD_ARGON2_SALT_LENGTH;
hash_length = SLAPD_ARGON2_HASH_LENGTH;
encoded_length = argon2_encodedlen( iterations, memory, parallelism,
salt_length, hash_length, Argon2_id );
salt.bv_len = salt_length;
salt.bv_val = ber_memalloc( salt.bv_len );
if ( salt.bv_val == NULL ) {
return LUTIL_PASSWD_ERR;
}
if ( lutil_entropy( (unsigned char*)salt.bv_val, salt.bv_len ) ) {
ber_memfree( salt.bv_val );
return LUTIL_PASSWD_ERR;
}
p = hash->bv_val = ber_memalloc( scheme->bv_len + encoded_length );
if ( p == NULL ) {
ber_memfree( salt.bv_val );
return LUTIL_PASSWD_ERR;
}
AC_MEMCPY( p, scheme->bv_val, scheme->bv_len );
p += scheme->bv_len;
/*
* Do the actual heavy lifting
*/
if ( argon2i_hash_encoded( iterations, memory, parallelism,
passwd->bv_val, passwd->bv_len,
salt.bv_val, salt_length, hash_length,
p, encoded_length ) == 0 ) {
rc = LUTIL_PASSWD_OK;
}
hash->bv_len = scheme->bv_len + encoded_length;
ber_memfree( salt.bv_val );
#else /* !HAVE_LIBARGON2 */
/* Not exposed by libsodium
salt_length = SLAPD_ARGON2_SALT_LENGTH;
hash_length = SLAPD_ARGON2_HASH_LENGTH;
*/
p = hash->bv_val = ber_memalloc( scheme->bv_len + crypto_pwhash_STRBYTES );
if ( p == NULL ) {
return LUTIL_PASSWD_ERR;
}
AC_MEMCPY( hash->bv_val, scheme->bv_val, scheme->bv_len );
p += scheme->bv_len;
if ( crypto_pwhash_str_alg( p, passwd->bv_val, passwd->bv_len,
iterations, memory * 1024,
crypto_pwhash_ALG_ARGON2ID13 ) == 0 ) {
hash->bv_len = strlen( hash->bv_val );
rc = LUTIL_PASSWD_OK;
}
#endif
if ( rc ) {
ber_memfree( hash->bv_val );
return LUTIL_PASSWD_ERR;
}
return LUTIL_PASSWD_OK;
}
static int
slapd_argon2_verify(
const struct berval *scheme,
const struct berval *passwd,
const struct berval *cred,
const char **text )
{
int rc = LUTIL_PASSWD_ERR;
#ifdef HAVE_LIBARGON2
if ( strncmp( passwd->bv_val, "$argon2i$", STRLENOF("$argon2i$") ) == 0 ) {
rc = argon2i_verify( passwd->bv_val, cred->bv_val, cred->bv_len );
} else if ( strncmp( passwd->bv_val, "$argon2d$", STRLENOF("$argon2d$") ) == 0 ) {
rc = argon2d_verify( passwd->bv_val, cred->bv_val, cred->bv_len );
} else if ( strncmp( passwd->bv_val, "$argon2id$", STRLENOF("$argon2id$") ) == 0 ) {
rc = argon2id_verify( passwd->bv_val, cred->bv_val, cred->bv_len );
}
#else /* !HAVE_LIBARGON2 */
rc = crypto_pwhash_str_verify( passwd->bv_val, cred->bv_val, cred->bv_len );
#endif
if ( rc ) {
return LUTIL_PASSWD_ERR;
}
return LUTIL_PASSWD_OK;
}
int init_module( int argc, char *argv[] )
{
int i;
#ifdef HAVE_LIBSODIUM
if ( sodium_init() == -1 ) {
return -1;
}
#endif
for ( i=0; i < argc; i++ ) {
char *p;
unsigned long value;
switch ( *argv[i] ) {
case 'm':
p = strchr( argv[i], '=' );
if ( !p || lutil_atoulx( &value, p+1, 0 ) ) {
return -1;
}
memory = value;
break;
case 't':
p = strchr( argv[i], '=' );
if ( !p || lutil_atoulx( &value, p+1, 0 ) ) {
return -1;
}
iterations = value;
break;
case 'p':
p = strchr( argv[i], '=' );
if ( !p || lutil_atoulx( &value, p+1, 0 ) ) {
return -1;
}
parallelism = value;
break;
default:
return -1;
}
}
#ifndef HAVE_LIBARGON2
/* At the moment, we can only use libargon2 to set parallelism for new
* hashes */
if ( parallelism != SLAPD_ARGON2_PARALLELISM ) {
Debug( LDAP_DEBUG_ANY, "pw-argon2: "
"non-default parallelism only supported when linked with "
"libargon2, got p=%lu\n",
parallelism );
if ( (slapMode & SLAP_MODE) != SLAP_TOOL_MODE ||
slapTool == SLAPPASSWD || slapTool == SLAPTEST ) {
return 1;
}
}
#endif
return lutil_passwd_add( (struct berval *)&slapd_argon2_scheme,
slapd_argon2_verify, slapd_argon2_hash );
}
#endif /* SLAPD_OVER_PW_ARGON2 */
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