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/** BEGIN COPYRIGHT BLOCK
* This Program is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software
* Foundation; version 2 of the License.
*
* This Program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with
* this Program; if not, write to the Free Software Foundation, Inc., 59 Temple
* Place, Suite 330, Boston, MA 02111-1307 USA.
*
* In addition, as a special exception, Red Hat, Inc. gives You the additional
* right to link the code of this Program with code not covered under the GNU
* General Public License ("Non-GPL Code") and to distribute linked combinations
* including the two, subject to the limitations in this paragraph. Non-GPL Code
* permitted under this exception must only link to the code of this Program
* through those well defined interfaces identified in the file named EXCEPTION
* found in the source code files (the "Approved Interfaces"). The files of
* Non-GPL Code may instantiate templates or use macros or inline functions from
* the Approved Interfaces without causing the resulting work to be covered by
* the GNU General Public License. Only Red Hat, Inc. may make changes or
* additions to the list of Approved Interfaces. You must obey the GNU General
* Public License in all respects for all of the Program code and other code used
* in conjunction with the Program except the Non-GPL Code covered by this
* exception. If you modify this file, you may extend this exception to your
* version of the file, but you are not obligated to do so. If you do not wish to
* provide this exception without modification, you must delete this exception
* statement from your version and license this file solely under the GPL without
* exception.
*
*
* Copyright (C) 2005 Red Hat, Inc.
* All rights reserved.
* END COPYRIGHT BLOCK **/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
/*
* Based on MD5 Password Encryption/Comparison routines by David Irving,
* Fred Brittain, and Aaron Gagnon -- University of Maine Farmington
* Donated to the RedHat Directory Server Project 2005-06-10
*/
#include <string.h>
#include <sys/types.h>
#include <stdio.h>
#include <pk11func.h>
#include <nss.h>
#include <nssb64.h>
#include <sechash.h>
#include "pwdstorage.h"
#define MD5_DEFAULT_SALT_LENGTH 4
#define MD5_MAX_SALT_LENGTH 16
#define SALTED_MD5_SUBSYSTEM_NAME "Salted MD5 password hash"
int
smd5_pw_cmp( const char *userpwd, const char *dbpwd )
{
int rc=-1;
PK11Context *ctx=NULL;
unsigned int outLen;
unsigned char userhash[MD5_LENGTH];
int hash_len;
unsigned char quick_dbhash[MD5_LENGTH + MD5_DEFAULT_SALT_LENGTH + 1];
unsigned char *dbhash = quick_dbhash;
struct berval salt;
char *hashresult = NULL;
ctx = PK11_CreateDigestContext(SEC_OID_MD5);
if (ctx == NULL) {
slapi_log_error(SLAPI_LOG_PLUGIN, SALTED_MD5_SUBSYSTEM_NAME,
"Could not create context for digest operation for password compare");
goto loser;
}
/*
* Decode hash stored in database.
*/
hash_len = pwdstorage_base64_decode_len(dbpwd, 0);
if ( hash_len >= sizeof(quick_dbhash) ) { /* get more space: */
dbhash = (unsigned char*) slapi_ch_calloc( hash_len + 1, sizeof(char) );
if ( dbhash == NULL ) goto loser;
} else {
memset( quick_dbhash, 0, sizeof(quick_dbhash) );
}
hashresult = PL_Base64Decode( dbpwd, 0, dbhash );
if (NULL == hashresult) {
slapi_log_error( SLAPI_LOG_PLUGIN, SALTED_MD5_SUBSYSTEM_NAME,
"smd5_pw_cmp: userPassword \"%s\" is the wrong length "
"or is not properly encoded BASE64\n", dbpwd );
goto loser;
}
salt.bv_val = (void*)(dbhash + MD5_LENGTH); /* salt starts after hash value */
salt.bv_len = hash_len - MD5_LENGTH; /* remaining bytes must be salt */
/* create the hash */
memset( userhash, 0, sizeof(userhash) );
PK11_DigestBegin(ctx);
PK11_DigestOp(ctx, (const unsigned char *)userpwd, strlen(userpwd));
PK11_DigestOp(ctx, (unsigned char*)(salt.bv_val), salt.bv_len);
PK11_DigestFinal(ctx, userhash, &outLen, sizeof userhash);
PK11_DestroyContext(ctx, 1);
/* Compare everything up to the salt. */
rc = memcmp( userhash, dbhash, MD5_LENGTH );
loser:
if ( dbhash && dbhash != quick_dbhash ) slapi_ch_free_string( (char **)&dbhash );
return rc;
}
char *
smd5_pw_enc( const char *pwd )
{
char * bver, *enc=NULL;
PK11Context *ctx=NULL;
unsigned int outLen;
unsigned char hash_out[MD5_LENGTH + MD5_DEFAULT_SALT_LENGTH];
unsigned char b2a_out[(MD5_LENGTH*2) + (MD5_MAX_SALT_LENGTH*2)]; /* conservative */
unsigned char *salt = hash_out + MD5_LENGTH;
struct berval saltval;
SECItem binary_item;
ctx = PK11_CreateDigestContext(SEC_OID_MD5);
if (ctx == NULL) {
slapi_log_error(SLAPI_LOG_PLUGIN, SALTED_MD5_SUBSYSTEM_NAME,
"Could not create context for digest operation for password encoding");
return NULL;
}
/* prepare the hash output area */
memset( hash_out, 0, sizeof(hash_out) );
/* generate a new random salt */
slapi_rand_array( (void *)salt, MD5_DEFAULT_SALT_LENGTH );
saltval.bv_val = (void*)salt;
saltval.bv_len = MD5_DEFAULT_SALT_LENGTH;
/* create the hash */
PK11_DigestBegin(ctx);
PK11_DigestOp(ctx, (const unsigned char *)pwd, strlen(pwd));
PK11_DigestOp(ctx, (unsigned char*)(saltval.bv_val), saltval.bv_len);
PK11_DigestFinal(ctx, hash_out, &outLen, sizeof hash_out);
PK11_DestroyContext(ctx, 1);
/* convert the binary hash to base64 */
binary_item.data = hash_out;
binary_item.len = outLen + MD5_DEFAULT_SALT_LENGTH;
bver = NSSBase64_EncodeItem(NULL, (char *)b2a_out, sizeof b2a_out, &binary_item);
if (bver) {
enc = slapi_ch_smprintf("%c%s%c%s", PWD_HASH_PREFIX_START, SALTED_MD5_SCHEME_NAME,
PWD_HASH_PREFIX_END, bver );
} else {
slapi_log_error(SLAPI_LOG_PLUGIN, SALTED_MD5_SUBSYSTEM_NAME,
"Could not base64 encode hashed value for password encoding");
}
return( enc );
}
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