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      1 /*	$NetBSD: salt-des3.c,v 1.4 2023/06/19 21:41:44 christos Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1997 - 2008 Kungliga Tekniska Hgskolan
      5  * (Royal Institute of Technology, Stockholm, Sweden).
      6  * All rights reserved.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  *
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  *
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * 3. Neither the name of the Institute nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #include "krb5_locl.h"
     37 
     38 #ifdef DES3_OLD_ENCTYPE
     39 static krb5_error_code
     40 DES3_string_to_key(krb5_context context,
     41 		   krb5_enctype enctype,
     42 		   krb5_data password,
     43 		   krb5_salt salt,
     44 		   krb5_data opaque,
     45 		   krb5_keyblock *key)
     46 {
     47     char *str;
     48     size_t len;
     49     unsigned char tmp[24];
     50     DES_cblock keys[3];
     51     krb5_error_code ret;
     52 
     53     len = password.length + salt.saltvalue.length;
     54     str = malloc(len);
     55     if (len != 0 && str == NULL)
     56 	return krb5_enomem(context);
     57     memcpy(str, password.data, password.length);
     58     memcpy(str + password.length, salt.saltvalue.data, salt.saltvalue.length);
     59     {
     60 	DES_cblock ivec;
     61 	DES_key_schedule s[3];
     62 	int i;
     63 
     64 	ret = _krb5_n_fold(str, len, tmp, 24);
     65 	if (ret) {
     66 	    memset_s(str, len, 0, len);
     67 	    free(str);
     68 	    krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
     69 	    return ret;
     70 	}
     71 
     72 	for(i = 0; i < 3; i++){
     73 	    memcpy(keys + i, tmp + i * 8, sizeof(keys[i]));
     74 	    DES_set_odd_parity(keys + i);
     75 	    if(DES_is_weak_key(keys + i))
     76 		_krb5_xor8(*(keys + i), (const unsigned char*)"\0\0\0\0\0\0\0\xf0");
     77 	    DES_set_key_unchecked(keys + i, &s[i]);
     78 	}
     79 	memset_s(&ivec, sizeof(ivec), 0, sizeof(ivec));
     80 	DES_ede3_cbc_encrypt(tmp,
     81 			     tmp, sizeof(tmp),
     82 			     &s[0], &s[1], &s[2], &ivec, DES_ENCRYPT);
     83 	memset_s(s, sizeof(s), 0, sizeof(s));
     84 	memset_s(&ivec, sizeof(ivec), 0, sizeof(ivec));
     85 	for(i = 0; i < 3; i++){
     86 	    memcpy(keys + i, tmp + i * 8, sizeof(keys[i]));
     87 	    DES_set_odd_parity(keys + i);
     88 	    if(DES_is_weak_key(keys + i))
     89 		_krb5_xor8(*(keys + i), (const unsigned char*)"\0\0\0\0\0\0\0\xf0");
     90 	}
     91 	memset_s(tmp, sizeof(tmp), 0, sizeof(tmp));
     92     }
     93     key->keytype = enctype;
     94     krb5_data_copy(&key->keyvalue, keys, sizeof(keys));
     95     memset_s(keys, sizeof(keys), 0, sizeof(keys));
     96     memset_s(str, len, 0, len);
     97     free(str);
     98     return 0;
     99 }
    100 #endif
    101 
    102 static krb5_error_code
    103 DES3_string_to_key_derived(krb5_context context,
    104 			   krb5_enctype enctype,
    105 			   krb5_data password,
    106 			   krb5_salt salt,
    107 			   krb5_data opaque,
    108 			   krb5_keyblock *key)
    109 {
    110     krb5_error_code ret;
    111     size_t len = password.length + salt.saltvalue.length;
    112     char *s;
    113 
    114     s = malloc(len);
    115     if (len != 0 && s == NULL)
    116 	return krb5_enomem(context);
    117     memcpy(s, password.data, password.length);
    118     if (salt.saltvalue.length)
    119         memcpy(s + password.length, salt.saltvalue.data, salt.saltvalue.length);
    120     ret = krb5_string_to_key_derived(context,
    121 				     s,
    122 				     len,
    123 				     enctype,
    124 				     key);
    125     memset_s(s, len, 0, len);
    126     free(s);
    127     return ret;
    128 }
    129 
    130 
    131 #ifdef DES3_OLD_ENCTYPE
    132 struct salt_type _krb5_des3_salt[] = {
    133     {
    134 	KRB5_PW_SALT,
    135 	"pw-salt",
    136 	DES3_string_to_key
    137     },
    138     { 0, NULL, NULL }
    139 };
    140 #endif
    141 
    142 struct salt_type _krb5_des3_salt_derived[] = {
    143     {
    144 	KRB5_PW_SALT,
    145 	"pw-salt",
    146 	DES3_string_to_key_derived
    147     },
    148     { 0, NULL, NULL }
    149 };
    150