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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) 2001 Sun Microsystems, Inc. Used by permission.
* Copyright (C) 2005 Red Hat, Inc.
* All rights reserved.
* END COPYRIGHT BLOCK **/
/*
* slapd hashed password routines
*
*/
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include "pwdstorage.h"
#include <sechash.h>
#define SHA_SALT_LENGTH 8 /* number of bytes of data in salt */
#define NOT_FIRST_TIME (time_t)1 /* not the first logon */
static char *hasherrmsg = "pw_cmp: %s userPassword \"%s\" is the wrong length or is not properly encoded BASE64\n";
static char *plugin_name = "NSPwdStoragePlugin";
#define DS40B1_SALTED_SHA_LENGTH 18
/* Directory Server 4.0 Beta 1 implemented a scheme that stored
* 8 bytes of salt plus the first 10 bytes of the SHA-1 digest.
* It's obsolescent now, but we still handle such stored values.
*/
int
sha_pw_cmp (char *userpwd, char *dbpwd, unsigned int shaLen )
{
/*
* SHA passwords are stored in the database as shaLen bytes of
* hash, followed by zero or more bytes of salt, all BASE64 encoded.
*/
int result = 1; /* failure */
unsigned char userhash[MAX_SHA_HASH_SIZE];
unsigned char quick_dbhash[MAX_SHA_HASH_SIZE + SHA_SALT_LENGTH + 3];
unsigned char *dbhash = quick_dbhash;
struct berval salt;
int hash_len; /* must be a signed valued -- see below */
unsigned int secOID;
char *schemeName;
/* Determine which algorithm we're using */
switch (shaLen) {
case SHA1_LENGTH:
schemeName = SHA1_SCHEME_NAME;
secOID = SEC_OID_SHA1;
break;
case SHA256_LENGTH:
schemeName = SHA256_SCHEME_NAME;
secOID = SEC_OID_SHA256;
break;
case SHA384_LENGTH:
schemeName = SHA384_SCHEME_NAME;
secOID = SEC_OID_SHA384;
break;
case SHA512_LENGTH:
schemeName = SHA512_SCHEME_NAME;
secOID = SEC_OID_SHA512;
break;
default:
/* An unknown shaLen was passed in. We shouldn't get here. */
goto loser;
}
/*
* Decode hash stored in database.
*
* Note that ldif_base64_decode() returns a value less than zero to
* indicate that a decoding error occurred, so it is critical that
* hash_len be a signed value.
*/
hash_len = (((strlen(dbpwd) + 3) / 4) * 3); /* maybe less */
if ( hash_len > sizeof(quick_dbhash) ) { /* get more space: */
dbhash = (unsigned char*) slapi_ch_malloc( hash_len );
if ( dbhash == NULL ) goto loser;
}
hash_len = ldif_base64_decode( dbpwd, dbhash );
if (hash_len < 0) {
slapi_log_error( SLAPI_LOG_PLUGIN, plugin_name, hasherrmsg, schemeName, dbpwd );
goto loser;
} else if ( hash_len >= shaLen ) {
salt.bv_val = (void*)(dbhash + shaLen);
salt.bv_len = hash_len - shaLen;
} else if ( hash_len == DS40B1_SALTED_SHA_LENGTH ) {
salt.bv_val = (void*)dbhash;
salt.bv_len = 8;
} else { /* unsupported, invalid BASE64 (hash_len < 0), or similar */
slapi_log_error( SLAPI_LOG_PLUGIN, plugin_name, hasherrmsg, schemeName, dbpwd );
goto loser;
}
/* hash the user's key */
if ( sha_salted_hash( userhash, userpwd, &salt, secOID ) != SECSuccess ) {
slapi_log_error( SLAPI_LOG_PLUGIN, plugin_name, "sha_pw_cmp: sha_salted_hash() failed\n");
goto loser;
}
/* the proof is in the comparison... */
result = ( hash_len == DS40B1_SALTED_SHA_LENGTH ) ?
( memcmp( userhash, dbhash + 8, hash_len - 8 )) :
( memcmp( userhash, dbhash, shaLen ));
loser:
if ( dbhash && dbhash != quick_dbhash ) slapi_ch_free( (void**)&dbhash );
return result;
}
char *
sha_pw_enc( char *pwd, unsigned int shaLen )
{
unsigned char hash[MAX_SHA_HASH_SIZE];
char *enc;
char *schemeName;
unsigned int schemeNameLen;
unsigned int secOID;
/* Determine which algorithm we're using */
switch (shaLen) {
case SHA1_LENGTH:
schemeName = SHA1_SCHEME_NAME;
schemeNameLen = SHA1_NAME_LEN;
secOID = SEC_OID_SHA1;
break;
case SHA256_LENGTH:
schemeName = SHA256_SCHEME_NAME;
schemeNameLen = SHA256_NAME_LEN;
secOID = SEC_OID_SHA256;
break;
case SHA384_LENGTH:
schemeName = SHA384_SCHEME_NAME;
schemeNameLen = SHA384_NAME_LEN;
secOID = SEC_OID_SHA384;
break;
case SHA512_LENGTH:
schemeName = SHA512_SCHEME_NAME;
schemeNameLen = SHA512_NAME_LEN;
secOID = SEC_OID_SHA512;
break;
default:
/* An unknown shaLen was passed in. We shouldn't get here. */
return( NULL );
}
/* hash the user's key */
if ( sha_salted_hash( hash, pwd, NULL, secOID ) != SECSuccess ) {
return( NULL );
}
if (( enc = slapi_ch_malloc( 3 + schemeNameLen +
LDIF_BASE64_LEN( shaLen ))) == NULL ) {
return( NULL );
}
sprintf( enc, "%c%s%c", PWD_HASH_PREFIX_START, schemeName,
PWD_HASH_PREFIX_END );
(void)ldif_base64_encode( hash, enc + 2 + schemeNameLen,
shaLen, -1 );
return( enc );
}
/*
* Wrapper password comparison functions
*/
int
sha1_pw_cmp (char *userpwd, char *dbpwd )
{
return sha_pw_cmp( userpwd, dbpwd, SHA1_LENGTH );
}
int
sha256_pw_cmp (char *userpwd, char *dbpwd )
{
return sha_pw_cmp( userpwd, dbpwd, SHA256_LENGTH );
}
int
sha384_pw_cmp (char *userpwd, char *dbpwd )
{
return sha_pw_cmp( userpwd, dbpwd, SHA384_LENGTH );
}
int
sha512_pw_cmp (char *userpwd, char *dbpwd )
{
return sha_pw_cmp( userpwd, dbpwd, SHA512_LENGTH );
}
/*
* Wrapper password encryption functions
*/
char *
sha1_pw_enc( char *pwd )
{
return sha_pw_enc( pwd, SHA1_LENGTH );
}
char *
sha256_pw_enc( char *pwd )
{
return sha_pw_enc( pwd, SHA256_LENGTH );
}
char *
sha384_pw_enc( char *pwd )
{
return sha_pw_enc( pwd, SHA384_LENGTH );
}
char *
sha512_pw_enc( char *pwd )
{
return sha_pw_enc( pwd, SHA512_LENGTH );
}
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