225 lines
6.7 KiB
C
225 lines
6.7 KiB
C
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/*
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* Copyright (c) 1997 - 2008 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "krb5_locl.h"
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#ifdef HEIM_WEAK_CRYPTO
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#ifdef ENABLE_AFS_STRING_TO_KEY
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/* This defines the Andrew string_to_key function. It accepts a password
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* string as input and converts it via a one-way encryption algorithm to a DES
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* encryption key. It is compatible with the original Andrew authentication
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* service password database.
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*/
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/*
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* Short passwords, i.e 8 characters or less.
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*/
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static void
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krb5_DES_AFS3_CMU_string_to_key (krb5_data pw,
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krb5_data cell,
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DES_cblock *key)
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{
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char password[8+1]; /* crypt is limited to 8 chars anyway */
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size_t i;
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for(i = 0; i < 8; i++) {
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char c = ((i < pw.length) ? ((char*)pw.data)[i] : 0) ^
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((i < cell.length) ?
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tolower(((unsigned char*)cell.data)[i]) : 0);
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password[i] = c ? c : 'X';
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}
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password[8] = '\0';
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memcpy(key, crypt(password, "p1") + 2, sizeof(DES_cblock));
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/* parity is inserted into the LSB so left shift each byte up one
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bit. This allows ascii characters with a zero MSB to retain as
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much significance as possible. */
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for (i = 0; i < sizeof(DES_cblock); i++)
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((unsigned char*)key)[i] <<= 1;
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DES_set_odd_parity (key);
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}
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/*
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* Long passwords, i.e 9 characters or more.
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*/
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static void
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krb5_DES_AFS3_Transarc_string_to_key (krb5_data pw,
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krb5_data cell,
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DES_cblock *key)
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{
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DES_key_schedule schedule;
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DES_cblock temp_key;
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DES_cblock ivec;
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char password[512];
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size_t passlen;
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memcpy(password, pw.data, min(pw.length, sizeof(password)));
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if(pw.length < sizeof(password)) {
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int len = min(cell.length, sizeof(password) - pw.length);
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size_t i;
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memcpy(password + pw.length, cell.data, len);
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for (i = pw.length; i < pw.length + len; ++i)
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password[i] = tolower((unsigned char)password[i]);
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}
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passlen = min(sizeof(password), pw.length + cell.length);
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memcpy(&ivec, "kerberos", 8);
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memcpy(&temp_key, "kerberos", 8);
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DES_set_odd_parity (&temp_key);
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DES_set_key_unchecked (&temp_key, &schedule);
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DES_cbc_cksum ((void*)password, &ivec, passlen, &schedule, &ivec);
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memcpy(&temp_key, &ivec, 8);
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DES_set_odd_parity (&temp_key);
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DES_set_key_unchecked (&temp_key, &schedule);
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DES_cbc_cksum ((void*)password, key, passlen, &schedule, &ivec);
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memset(&schedule, 0, sizeof(schedule));
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memset(&temp_key, 0, sizeof(temp_key));
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memset(&ivec, 0, sizeof(ivec));
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memset(password, 0, sizeof(password));
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DES_set_odd_parity (key);
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}
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static krb5_error_code
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DES_AFS3_string_to_key(krb5_context context,
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krb5_enctype enctype,
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krb5_data password,
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krb5_salt salt,
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krb5_data opaque,
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krb5_keyblock *key)
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{
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DES_cblock tmp;
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if(password.length > 8)
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krb5_DES_AFS3_Transarc_string_to_key(password, salt.saltvalue, &tmp);
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else
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krb5_DES_AFS3_CMU_string_to_key(password, salt.saltvalue, &tmp);
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key->keytype = enctype;
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krb5_data_copy(&key->keyvalue, tmp, sizeof(tmp));
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memset(&key, 0, sizeof(key));
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return 0;
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}
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#endif /* ENABLE_AFS_STRING_TO_KEY */
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static void
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DES_string_to_key_int(unsigned char *data, size_t length, DES_cblock *key)
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{
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DES_key_schedule schedule;
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size_t i;
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int reverse = 0;
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unsigned char *p;
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unsigned char swap[] = { 0x0, 0x8, 0x4, 0xc, 0x2, 0xa, 0x6, 0xe,
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0x1, 0x9, 0x5, 0xd, 0x3, 0xb, 0x7, 0xf };
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memset(key, 0, 8);
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p = (unsigned char*)key;
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for (i = 0; i < length; i++) {
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unsigned char tmp = data[i];
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if (!reverse)
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*p++ ^= (tmp << 1);
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else
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*--p ^= (swap[tmp & 0xf] << 4) | swap[(tmp & 0xf0) >> 4];
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if((i % 8) == 7)
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reverse = !reverse;
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}
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DES_set_odd_parity(key);
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if(DES_is_weak_key(key))
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(*key)[7] ^= 0xF0;
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DES_set_key_unchecked(key, &schedule);
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DES_cbc_cksum((void*)data, key, length, &schedule, key);
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memset(&schedule, 0, sizeof(schedule));
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DES_set_odd_parity(key);
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if(DES_is_weak_key(key))
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(*key)[7] ^= 0xF0;
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}
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static krb5_error_code
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krb5_DES_string_to_key(krb5_context context,
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krb5_enctype enctype,
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krb5_data password,
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krb5_salt salt,
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krb5_data opaque,
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krb5_keyblock *key)
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{
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unsigned char *s;
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size_t len;
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DES_cblock tmp;
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#ifdef ENABLE_AFS_STRING_TO_KEY
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if (opaque.length == 1) {
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unsigned long v;
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_krb5_get_int(opaque.data, &v, 1);
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if (v == 1)
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return DES_AFS3_string_to_key(context, enctype, password,
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salt, opaque, key);
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}
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#endif
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len = password.length + salt.saltvalue.length;
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s = malloc(len);
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if(len > 0 && s == NULL) {
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krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
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return ENOMEM;
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}
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memcpy(s, password.data, password.length);
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memcpy(s + password.length, salt.saltvalue.data, salt.saltvalue.length);
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DES_string_to_key_int(s, len, &tmp);
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key->keytype = enctype;
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krb5_data_copy(&key->keyvalue, tmp, sizeof(tmp));
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memset(&tmp, 0, sizeof(tmp));
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memset(s, 0, len);
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free(s);
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return 0;
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}
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struct salt_type _krb5_des_salt[] = {
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{
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KRB5_PW_SALT,
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"pw-salt",
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krb5_DES_string_to_key
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},
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#ifdef ENABLE_AFS_STRING_TO_KEY
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{
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KRB5_AFS3_SALT,
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"afs3-salt",
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DES_AFS3_string_to_key
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},
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#endif
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{ 0 }
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};
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#endif
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