2323 lines
53 KiB
C
2323 lines
53 KiB
C
/*
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* Copyright (c) 1997 - 2000 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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RCSID("$Id: crypto.c,v 1.29 2000/01/25 23:06:55 assar Exp $");
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/* RCSID("$FreeBSD$"); */
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#undef CRYPTO_DEBUG
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#ifdef CRYPTO_DEBUG
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static void krb5_crypto_debug(krb5_context, int, size_t, krb5_keyblock*);
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#endif
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struct key_data {
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krb5_keyblock *key;
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krb5_data *schedule;
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};
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struct key_usage {
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unsigned usage;
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struct key_data key;
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};
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struct krb5_crypto_data {
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struct encryption_type *et;
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struct key_data key;
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int num_key_usage;
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struct key_usage *key_usage;
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};
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#define CRYPTO_ETYPE(C) ((C)->et->type)
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/* bits for `flags' below */
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#define F_KEYED 1 /* checksum is keyed */
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#define F_CPROOF 2 /* checksum is collision proof */
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#define F_DERIVED 4 /* uses derived keys */
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#define F_VARIANT 8 /* uses `variant' keys (6.4.3) */
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#define F_PSEUDO 16 /* not a real protocol type */
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struct salt_type {
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krb5_salttype type;
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const char *name;
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krb5_error_code (*string_to_key)(krb5_context, krb5_enctype, krb5_data,
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krb5_salt, krb5_keyblock*);
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};
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struct key_type {
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krb5_keytype type; /* XXX */
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const char *name;
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size_t bits;
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size_t size;
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size_t schedule_size;
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#if 0
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krb5_enctype best_etype;
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#endif
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void (*random_key)(krb5_context, krb5_keyblock*);
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void (*schedule)(krb5_context, struct key_data *);
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struct salt_type *string_to_key;
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};
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struct checksum_type {
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krb5_cksumtype type;
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const char *name;
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size_t blocksize;
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size_t checksumsize;
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unsigned flags;
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void (*checksum)(krb5_context, struct key_data*, void*, size_t, Checksum*);
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krb5_error_code (*verify)(krb5_context, struct key_data*,
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void*, size_t, Checksum*);
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};
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struct encryption_type {
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krb5_enctype type;
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const char *name;
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size_t blocksize;
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size_t confoundersize;
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struct key_type *keytype;
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struct checksum_type *cksumtype;
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struct checksum_type *keyed_checksum;
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unsigned flags;
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void (*encrypt)(struct key_data *, void *, size_t, int);
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};
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#define ENCRYPTION_USAGE(U) (((U) << 8) | 0xAA)
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#define INTEGRITY_USAGE(U) (((U) << 8) | 0x55)
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#define CHECKSUM_USAGE(U) (((U) << 8) | 0x99)
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static struct checksum_type *_find_checksum(krb5_cksumtype type);
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static struct encryption_type *_find_enctype(krb5_enctype type);
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static struct key_type *_find_keytype(krb5_keytype type);
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static krb5_error_code _get_derived_key(krb5_context, krb5_crypto,
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unsigned, struct key_data**);
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static struct key_data *_new_derived_key(krb5_crypto crypto, unsigned usage);
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/************************************************************
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* *
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************************************************************/
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static void
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DES_random_key(krb5_context context,
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krb5_keyblock *key)
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{
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des_cblock *k = key->keyvalue.data;
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do {
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krb5_generate_random_block(k, sizeof(des_cblock));
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des_set_odd_parity(k);
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} while(des_is_weak_key(k));
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}
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static void
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DES_schedule(krb5_context context,
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struct key_data *key)
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{
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des_set_key(key->key->keyvalue.data, key->schedule->data);
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}
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static krb5_error_code
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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_keyblock *key)
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{
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char *s;
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size_t len;
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des_cblock tmp;
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len = password.length + salt.saltvalue.length + 1;
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s = malloc(len);
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if(s == NULL)
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return ENOMEM;
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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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s[len - 1] = '\0';
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des_string_to_key(s, &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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/* This defines the Andrew string_to_key function. It accepts a password
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* string as input and converts its 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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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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int 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) ? ((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, "#~") + 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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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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memcpy(password + pw.length,
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cell.data, min(cell.length,
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sizeof(password) - pw.length));
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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 (&temp_key, schedule);
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des_cbc_cksum ((const void *)password, &ivec, passlen,
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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 (&temp_key, schedule);
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des_cbc_cksum ((const void *)password, key, passlen,
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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_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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DES_AFS3_Transarc_string_to_key(password, salt.saltvalue, &tmp);
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else
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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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static void
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DES3_random_key(krb5_context context,
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krb5_keyblock *key)
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{
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des_cblock *k = key->keyvalue.data;
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do {
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krb5_generate_random_block(k, 3 * sizeof(des_cblock));
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des_set_odd_parity(&k[0]);
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des_set_odd_parity(&k[1]);
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des_set_odd_parity(&k[2]);
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} while(des_is_weak_key(&k[0]) ||
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des_is_weak_key(&k[1]) ||
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des_is_weak_key(&k[2]));
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}
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static void
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DES3_schedule(krb5_context context,
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struct key_data *key)
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{
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des_cblock *k = key->key->keyvalue.data;
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des_key_schedule *s = key->schedule->data;
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des_set_key(&k[0], s[0]);
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des_set_key(&k[1], s[1]);
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des_set_key(&k[2], s[2]);
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}
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/*
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* A = A xor B. A & B are 8 bytes.
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*/
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static void
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xor (des_cblock *key, const unsigned char *b)
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{
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unsigned char *a = (unsigned char*)key;
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a[0] ^= b[0];
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a[1] ^= b[1];
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a[2] ^= b[2];
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a[3] ^= b[3];
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a[4] ^= b[4];
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a[5] ^= b[5];
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a[6] ^= b[6];
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a[7] ^= b[7];
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}
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static krb5_error_code
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DES3_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_keyblock *key)
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{
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char *str;
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size_t len;
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unsigned char tmp[24];
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des_cblock keys[3];
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len = password.length + salt.saltvalue.length;
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str = malloc(len);
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if(len != 0 && str == NULL)
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return ENOMEM;
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memcpy(str, password.data, password.length);
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memcpy(str + password.length, salt.saltvalue.data, salt.saltvalue.length);
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{
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des_cblock ivec;
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des_key_schedule s[3];
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int i;
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_krb5_n_fold(str, len, tmp, 24);
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for(i = 0; i < 3; i++){
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memcpy(keys + i, tmp + i * 8, sizeof(keys[i]));
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des_set_odd_parity(keys + i);
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if(des_is_weak_key(keys + i))
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xor(keys + i, (unsigned char*)"\0\0\0\0\0\0\0\xf0");
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des_set_key(keys + i, s[i]);
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}
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memset(&ivec, 0, sizeof(ivec));
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des_ede3_cbc_encrypt((const void *)tmp,
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(void *)tmp, sizeof(tmp),
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s[0], s[1], s[2], &ivec, DES_ENCRYPT);
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memset(s, 0, sizeof(s));
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memset(&ivec, 0, sizeof(ivec));
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for(i = 0; i < 3; i++){
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memcpy(keys + i, tmp + i * 8, sizeof(keys[i]));
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des_set_odd_parity(keys + i);
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if(des_is_weak_key(keys + i))
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xor(keys + i, (unsigned char*)"\0\0\0\0\0\0\0\xf0");
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}
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memset(tmp, 0, sizeof(tmp));
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}
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key->keytype = enctype;
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krb5_data_copy(&key->keyvalue, keys, sizeof(keys));
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memset(keys, 0, sizeof(keys));
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memset(str, 0, len);
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free(str);
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return 0;
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}
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static krb5_error_code
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DES3_string_to_key_derived(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_keyblock *key)
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{
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krb5_error_code ret;
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size_t len = password.length + salt.saltvalue.length;
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char *s;
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s = malloc(len);
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if(len != 0 && s == NULL)
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return ENOMEM;
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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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ret = krb5_string_to_key_derived(context,
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s,
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len,
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enctype,
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key);
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memset(s, 0, len);
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free(s);
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return ret;
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}
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/*
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* ARCFOUR
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*/
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static void
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ARCFOUR_random_key(krb5_context context, krb5_keyblock *key)
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{
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krb5_generate_random_block (key->keyvalue.data,
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key->keyvalue.length);
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}
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static void
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ARCFOUR_schedule(krb5_context context, struct key_data *kd)
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{
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RC4_set_key (kd->schedule->data,
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kd->key->keyvalue.length, kd->key->keyvalue.data);
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}
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static krb5_error_code
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ARCFOUR_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_keyblock *key)
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{
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char *s, *p;
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size_t len;
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int i;
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MD4_CTX m;
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len = 2 * (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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return ENOMEM;
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for (p = s, i = 0; i < password.length; ++i) {
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*p++ = ((char *)password.data)[i];
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*p++ = 0;
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}
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for (i = 0; i < salt.saltvalue.length; ++i) {
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*p++ = ((char *)salt.saltvalue.data)[i];
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*p++ = 0;
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}
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MD4Init (&m);
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MD4Update (&m, s, len);
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key->keytype = enctype;
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krb5_data_alloc (&key->keyvalue, 16);
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MD4Final (key->keyvalue.data, &m);
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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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extern struct salt_type des_salt[],
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des3_salt[], des3_salt_derived[], arcfour_salt[];
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struct key_type keytype_null = {
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KEYTYPE_NULL,
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"null",
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0,
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0,
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0,
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NULL,
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NULL,
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NULL
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};
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struct key_type keytype_des = {
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KEYTYPE_DES,
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"des",
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56,
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sizeof(des_cblock),
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sizeof(des_key_schedule),
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DES_random_key,
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DES_schedule,
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des_salt
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};
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struct key_type keytype_des3 = {
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KEYTYPE_DES3,
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"des3",
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168,
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3 * sizeof(des_cblock),
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3 * sizeof(des_key_schedule),
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DES3_random_key,
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DES3_schedule,
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des3_salt
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};
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struct key_type keytype_des3_derived = {
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KEYTYPE_DES3,
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"des3",
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168,
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3 * sizeof(des_cblock),
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3 * sizeof(des_key_schedule),
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DES3_random_key,
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DES3_schedule,
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des3_salt_derived
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};
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struct key_type keytype_arcfour = {
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KEYTYPE_ARCFOUR,
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"arcfour",
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128,
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16,
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sizeof(RC4_KEY),
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ARCFOUR_random_key,
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ARCFOUR_schedule,
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arcfour_salt
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};
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|
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struct key_type *keytypes[] = {
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&keytype_null,
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&keytype_des,
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&keytype_des3_derived,
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&keytype_des3,
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&keytype_arcfour
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};
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static int num_keytypes = sizeof(keytypes) / sizeof(keytypes[0]);
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|
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static struct key_type *
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_find_keytype(krb5_keytype type)
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{
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int i;
|
|
for(i = 0; i < num_keytypes; i++)
|
|
if(keytypes[i]->type == type)
|
|
return keytypes[i];
|
|
return NULL;
|
|
}
|
|
|
|
|
|
struct salt_type des_salt[] = {
|
|
{
|
|
KRB5_PW_SALT,
|
|
"pw-salt",
|
|
DES_string_to_key
|
|
},
|
|
{
|
|
KRB5_AFS3_SALT,
|
|
"afs3-salt",
|
|
DES_AFS3_string_to_key
|
|
},
|
|
{ 0 }
|
|
};
|
|
|
|
struct salt_type des3_salt[] = {
|
|
{
|
|
KRB5_PW_SALT,
|
|
"pw-salt",
|
|
DES3_string_to_key
|
|
},
|
|
{ 0 }
|
|
};
|
|
|
|
struct salt_type des3_salt_derived[] = {
|
|
{
|
|
KRB5_PW_SALT,
|
|
"pw-salt",
|
|
DES3_string_to_key_derived
|
|
},
|
|
{ 0 }
|
|
};
|
|
|
|
struct salt_type arcfour_salt[] = {
|
|
{
|
|
KRB5_PW_SALT,
|
|
"pw-salt",
|
|
ARCFOUR_string_to_key
|
|
},
|
|
{ 0 }
|
|
};
|
|
|
|
krb5_error_code
|
|
krb5_salttype_to_string (krb5_context context,
|
|
krb5_enctype etype,
|
|
krb5_salttype stype,
|
|
char **string)
|
|
{
|
|
struct encryption_type *e;
|
|
struct salt_type *st;
|
|
|
|
e = _find_enctype (etype);
|
|
if (e == NULL)
|
|
return KRB5_PROG_ETYPE_NOSUPP;
|
|
for (st = e->keytype->string_to_key; st && st->type; st++) {
|
|
if (st->type == stype) {
|
|
*string = strdup (st->name);
|
|
if (*string == NULL)
|
|
return ENOMEM;
|
|
return 0;
|
|
}
|
|
}
|
|
return HEIM_ERR_SALTTYPE_NOSUPP;
|
|
}
|
|
|
|
krb5_error_code
|
|
krb5_string_to_salttype (krb5_context context,
|
|
krb5_enctype etype,
|
|
const char *string,
|
|
krb5_salttype *salttype)
|
|
{
|
|
struct encryption_type *e;
|
|
struct salt_type *st;
|
|
|
|
e = _find_enctype (etype);
|
|
if (e == NULL)
|
|
return KRB5_PROG_ETYPE_NOSUPP;
|
|
for (st = e->keytype->string_to_key; st && st->type; st++) {
|
|
if (strcasecmp (st->name, string) == 0) {
|
|
*salttype = st->type;
|
|
return 0;
|
|
}
|
|
}
|
|
return HEIM_ERR_SALTTYPE_NOSUPP;
|
|
}
|
|
|
|
krb5_error_code
|
|
krb5_get_pw_salt(krb5_context context,
|
|
krb5_const_principal principal,
|
|
krb5_salt *salt)
|
|
{
|
|
size_t len;
|
|
int i;
|
|
krb5_error_code ret;
|
|
char *p;
|
|
|
|
salt->salttype = KRB5_PW_SALT;
|
|
len = strlen(principal->realm);
|
|
for (i = 0; i < principal->name.name_string.len; ++i)
|
|
len += strlen(principal->name.name_string.val[i]);
|
|
ret = krb5_data_alloc (&salt->saltvalue, len);
|
|
if (ret)
|
|
return ret;
|
|
p = salt->saltvalue.data;
|
|
memcpy (p, principal->realm, strlen(principal->realm));
|
|
p += strlen(principal->realm);
|
|
for (i = 0; i < principal->name.name_string.len; ++i) {
|
|
memcpy (p,
|
|
principal->name.name_string.val[i],
|
|
strlen(principal->name.name_string.val[i]));
|
|
p += strlen(principal->name.name_string.val[i]);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
krb5_error_code
|
|
krb5_free_salt(krb5_context context,
|
|
krb5_salt salt)
|
|
{
|
|
krb5_data_free(&salt.saltvalue);
|
|
return 0;
|
|
}
|
|
|
|
krb5_error_code
|
|
krb5_string_to_key_data (krb5_context context,
|
|
krb5_enctype enctype,
|
|
krb5_data password,
|
|
krb5_principal principal,
|
|
krb5_keyblock *key)
|
|
{
|
|
krb5_error_code ret;
|
|
krb5_salt salt;
|
|
|
|
ret = krb5_get_pw_salt(context, principal, &salt);
|
|
if(ret)
|
|
return ret;
|
|
ret = krb5_string_to_key_data_salt(context, enctype, password, salt, key);
|
|
krb5_free_salt(context, salt);
|
|
return ret;
|
|
}
|
|
|
|
krb5_error_code
|
|
krb5_string_to_key (krb5_context context,
|
|
krb5_enctype enctype,
|
|
const char *password,
|
|
krb5_principal principal,
|
|
krb5_keyblock *key)
|
|
{
|
|
krb5_data pw;
|
|
pw.data = (void*)password;
|
|
pw.length = strlen(password);
|
|
return krb5_string_to_key_data(context, enctype, pw, principal, key);
|
|
}
|
|
|
|
krb5_error_code
|
|
krb5_string_to_key_data_salt (krb5_context context,
|
|
krb5_enctype enctype,
|
|
krb5_data password,
|
|
krb5_salt salt,
|
|
krb5_keyblock *key)
|
|
{
|
|
struct encryption_type *et =_find_enctype(enctype);
|
|
struct salt_type *st;
|
|
if(et == NULL)
|
|
return KRB5_PROG_ETYPE_NOSUPP;
|
|
for(st = et->keytype->string_to_key; st && st->type; st++)
|
|
if(st->type == salt.salttype)
|
|
return (*st->string_to_key)(context, enctype, password, salt, key);
|
|
return HEIM_ERR_SALTTYPE_NOSUPP;
|
|
}
|
|
|
|
krb5_error_code
|
|
krb5_string_to_key_salt (krb5_context context,
|
|
krb5_enctype enctype,
|
|
const char *password,
|
|
krb5_salt salt,
|
|
krb5_keyblock *key)
|
|
{
|
|
krb5_data pw;
|
|
pw.data = (void*)password;
|
|
pw.length = strlen(password);
|
|
return krb5_string_to_key_data_salt(context, enctype, pw, salt, key);
|
|
}
|
|
|
|
krb5_error_code
|
|
krb5_keytype_to_string(krb5_context context,
|
|
krb5_keytype keytype,
|
|
char **string)
|
|
{
|
|
struct key_type *kt = _find_keytype(keytype);
|
|
if(kt == NULL)
|
|
return KRB5_PROG_KEYTYPE_NOSUPP;
|
|
*string = strdup(kt->name);
|
|
if(*string == NULL)
|
|
return ENOMEM;
|
|
return 0;
|
|
}
|
|
|
|
krb5_error_code
|
|
krb5_string_to_keytype(krb5_context context,
|
|
const char *string,
|
|
krb5_keytype *keytype)
|
|
{
|
|
int i;
|
|
for(i = 0; i < num_keytypes; i++)
|
|
if(strcasecmp(keytypes[i]->name, string) == 0){
|
|
*keytype = keytypes[i]->type;
|
|
return 0;
|
|
}
|
|
return KRB5_PROG_KEYTYPE_NOSUPP;
|
|
}
|
|
|
|
krb5_error_code
|
|
krb5_generate_random_keyblock(krb5_context context,
|
|
krb5_enctype type,
|
|
krb5_keyblock *key)
|
|
{
|
|
krb5_error_code ret;
|
|
struct encryption_type *et = _find_enctype(type);
|
|
if(et == NULL)
|
|
return KRB5_PROG_ETYPE_NOSUPP;
|
|
ret = krb5_data_alloc(&key->keyvalue, et->keytype->size);
|
|
if(ret)
|
|
return ret;
|
|
key->keytype = type;
|
|
if(et->keytype->random_key)
|
|
(*et->keytype->random_key)(context, key);
|
|
else
|
|
krb5_generate_random_block(key->keyvalue.data,
|
|
key->keyvalue.length);
|
|
return 0;
|
|
}
|
|
|
|
static krb5_error_code
|
|
_key_schedule(krb5_context context,
|
|
struct key_data *key)
|
|
{
|
|
krb5_error_code ret;
|
|
struct encryption_type *et = _find_enctype(key->key->keytype);
|
|
struct key_type *kt = et->keytype;
|
|
|
|
if(kt->schedule == NULL)
|
|
return 0;
|
|
ALLOC(key->schedule, 1);
|
|
if(key->schedule == NULL)
|
|
return ENOMEM;
|
|
ret = krb5_data_alloc(key->schedule, kt->schedule_size);
|
|
if(ret) {
|
|
free(key->schedule);
|
|
key->schedule = NULL;
|
|
return ret;
|
|
}
|
|
(*kt->schedule)(context, key);
|
|
return 0;
|
|
}
|
|
|
|
/************************************************************
|
|
* *
|
|
************************************************************/
|
|
|
|
static void
|
|
NONE_checksum(krb5_context context,
|
|
struct key_data *key,
|
|
void *data,
|
|
size_t len,
|
|
Checksum *C)
|
|
{
|
|
}
|
|
|
|
static void
|
|
CRC32_checksum(krb5_context context,
|
|
struct key_data *key,
|
|
void *data,
|
|
size_t len,
|
|
Checksum *C)
|
|
{
|
|
u_int32_t crc;
|
|
unsigned char *r = C->checksum.data;
|
|
_krb5_crc_init_table ();
|
|
crc = _krb5_crc_update (data, len, 0);
|
|
r[0] = crc & 0xff;
|
|
r[1] = (crc >> 8) & 0xff;
|
|
r[2] = (crc >> 16) & 0xff;
|
|
r[3] = (crc >> 24) & 0xff;
|
|
}
|
|
|
|
static void
|
|
RSA_MD4_checksum(krb5_context context,
|
|
struct key_data *key,
|
|
void *data,
|
|
size_t len,
|
|
Checksum *C)
|
|
{
|
|
MD4_CTX m;
|
|
|
|
MD4Init (&m);
|
|
MD4Update (&m, data, len);
|
|
MD4Final (C->checksum.data, &m);
|
|
}
|
|
|
|
static void
|
|
RSA_MD4_DES_checksum(krb5_context context,
|
|
struct key_data *key,
|
|
void *data,
|
|
size_t len,
|
|
Checksum *cksum)
|
|
{
|
|
MD4_CTX md4;
|
|
des_cblock ivec;
|
|
unsigned char *p = cksum->checksum.data;
|
|
|
|
krb5_generate_random_block(p, 8);
|
|
MD4Init (&md4);
|
|
MD4Update (&md4, p, 8);
|
|
MD4Update (&md4, data, len);
|
|
MD4Final (p + 8, &md4);
|
|
memset (&ivec, 0, sizeof(ivec));
|
|
des_cbc_encrypt((const void *)p,
|
|
(void *)p,
|
|
24,
|
|
key->schedule->data,
|
|
&ivec,
|
|
DES_ENCRYPT);
|
|
}
|
|
|
|
static krb5_error_code
|
|
RSA_MD4_DES_verify(krb5_context context,
|
|
struct key_data *key,
|
|
void *data,
|
|
size_t len,
|
|
Checksum *C)
|
|
{
|
|
MD4_CTX md4;
|
|
unsigned char tmp[24];
|
|
unsigned char res[16];
|
|
des_cblock ivec;
|
|
krb5_error_code ret = 0;
|
|
|
|
memset(&ivec, 0, sizeof(ivec));
|
|
des_cbc_encrypt(C->checksum.data,
|
|
(void*)tmp,
|
|
C->checksum.length,
|
|
key->schedule->data,
|
|
&ivec,
|
|
DES_DECRYPT);
|
|
MD4Init (&md4);
|
|
MD4Update (&md4, tmp, 8); /* confounder */
|
|
MD4Update (&md4, data, len);
|
|
MD4Final (res, &md4);
|
|
if(memcmp(res, tmp + 8, sizeof(res)) != 0)
|
|
ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
|
|
memset(tmp, 0, sizeof(tmp));
|
|
memset(res, 0, sizeof(res));
|
|
return ret;
|
|
}
|
|
|
|
static void
|
|
RSA_MD5_checksum(krb5_context context,
|
|
struct key_data *key,
|
|
void *data,
|
|
size_t len,
|
|
Checksum *C)
|
|
{
|
|
MD5_CTX m;
|
|
|
|
MD5Init (&m);
|
|
MD5Update(&m, data, len);
|
|
MD5Final (C->checksum.data, &m);
|
|
}
|
|
|
|
static void
|
|
RSA_MD5_DES_checksum(krb5_context context,
|
|
struct key_data *key,
|
|
void *data,
|
|
size_t len,
|
|
Checksum *C)
|
|
{
|
|
MD5_CTX md5;
|
|
des_cblock ivec;
|
|
unsigned char *p = C->checksum.data;
|
|
|
|
krb5_generate_random_block(p, 8);
|
|
MD5Init (&md5);
|
|
MD5Update (&md5, p, 8);
|
|
MD5Update (&md5, data, len);
|
|
MD5Final (p + 8, &md5);
|
|
memset (&ivec, 0, sizeof(ivec));
|
|
des_cbc_encrypt((const void *)p,
|
|
(void *)p,
|
|
24,
|
|
key->schedule->data,
|
|
&ivec,
|
|
DES_ENCRYPT);
|
|
}
|
|
|
|
static krb5_error_code
|
|
RSA_MD5_DES_verify(krb5_context context,
|
|
struct key_data *key,
|
|
void *data,
|
|
size_t len,
|
|
Checksum *C)
|
|
{
|
|
MD5_CTX md5;
|
|
unsigned char tmp[24];
|
|
unsigned char res[16];
|
|
des_cblock ivec;
|
|
des_key_schedule *sched = key->schedule->data;
|
|
krb5_error_code ret = 0;
|
|
|
|
memset(&ivec, 0, sizeof(ivec));
|
|
des_cbc_encrypt(C->checksum.data,
|
|
(void*)tmp,
|
|
C->checksum.length,
|
|
sched[0],
|
|
&ivec,
|
|
DES_DECRYPT);
|
|
MD5Init (&md5);
|
|
MD5Update (&md5, tmp, 8); /* confounder */
|
|
MD5Update (&md5, data, len);
|
|
MD5Final (res, &md5);
|
|
if(memcmp(res, tmp + 8, sizeof(res)) != 0)
|
|
ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
|
|
memset(tmp, 0, sizeof(tmp));
|
|
memset(res, 0, sizeof(res));
|
|
return ret;
|
|
}
|
|
|
|
static void
|
|
RSA_MD5_DES3_checksum(krb5_context context,
|
|
struct key_data *key,
|
|
void *data,
|
|
size_t len,
|
|
Checksum *C)
|
|
{
|
|
MD5_CTX md5;
|
|
des_cblock ivec;
|
|
unsigned char *p = C->checksum.data;
|
|
des_key_schedule *sched = key->schedule->data;
|
|
|
|
krb5_generate_random_block(p, 8);
|
|
MD5Init (&md5);
|
|
MD5Update (&md5, p, 8);
|
|
MD5Update (&md5, data, len);
|
|
MD5Final (p + 8, &md5);
|
|
memset (&ivec, 0, sizeof(ivec));
|
|
des_ede3_cbc_encrypt((const void *)p,
|
|
(void *)p,
|
|
24,
|
|
sched[0], sched[1], sched[2],
|
|
&ivec,
|
|
DES_ENCRYPT);
|
|
}
|
|
|
|
static krb5_error_code
|
|
RSA_MD5_DES3_verify(krb5_context context,
|
|
struct key_data *key,
|
|
void *data,
|
|
size_t len,
|
|
Checksum *C)
|
|
{
|
|
MD5_CTX md5;
|
|
unsigned char tmp[24];
|
|
unsigned char res[16];
|
|
des_cblock ivec;
|
|
des_key_schedule *sched = key->schedule->data;
|
|
krb5_error_code ret = 0;
|
|
|
|
memset(&ivec, 0, sizeof(ivec));
|
|
des_ede3_cbc_encrypt(C->checksum.data,
|
|
(void*)tmp,
|
|
C->checksum.length,
|
|
sched[0], sched[1], sched[2],
|
|
&ivec,
|
|
DES_DECRYPT);
|
|
MD5Init (&md5);
|
|
MD5Update (&md5, tmp, 8); /* confounder */
|
|
MD5Update (&md5, data, len);
|
|
MD5Final (res, &md5);
|
|
if(memcmp(res, tmp + 8, sizeof(res)) != 0)
|
|
ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
|
|
memset(tmp, 0, sizeof(tmp));
|
|
memset(res, 0, sizeof(res));
|
|
return ret;
|
|
}
|
|
|
|
static void
|
|
SHA1_checksum(krb5_context context,
|
|
struct key_data *key,
|
|
void *data,
|
|
size_t len,
|
|
Checksum *C)
|
|
{
|
|
SHA1_CTX m;
|
|
|
|
SHA_Init(&m);
|
|
SHA_Update(&m, data, len);
|
|
SHA_Final(C->checksum.data, &m);
|
|
}
|
|
|
|
/* HMAC according to RFC2104 */
|
|
static void
|
|
hmac(krb5_context context,
|
|
struct checksum_type *cm,
|
|
void *data,
|
|
size_t len,
|
|
struct key_data *keyblock,
|
|
Checksum *result)
|
|
{
|
|
unsigned char *ipad, *opad;
|
|
unsigned char *key;
|
|
size_t key_len;
|
|
int i;
|
|
|
|
if(keyblock->key->keyvalue.length > cm->blocksize){
|
|
(*cm->checksum)(context,
|
|
keyblock,
|
|
keyblock->key->keyvalue.data,
|
|
keyblock->key->keyvalue.length,
|
|
result);
|
|
key = result->checksum.data;
|
|
key_len = result->checksum.length;
|
|
} else {
|
|
key = keyblock->key->keyvalue.data;
|
|
key_len = keyblock->key->keyvalue.length;
|
|
}
|
|
ipad = malloc(cm->blocksize + len);
|
|
opad = malloc(cm->blocksize + cm->checksumsize);
|
|
memset(ipad, 0x36, cm->blocksize);
|
|
memset(opad, 0x5c, cm->blocksize);
|
|
for(i = 0; i < key_len; i++){
|
|
ipad[i] ^= key[i];
|
|
opad[i] ^= key[i];
|
|
}
|
|
memcpy(ipad + cm->blocksize, data, len);
|
|
(*cm->checksum)(context, keyblock, ipad, cm->blocksize + len, result);
|
|
memcpy(opad + cm->blocksize, result->checksum.data,
|
|
result->checksum.length);
|
|
(*cm->checksum)(context, keyblock, opad,
|
|
cm->blocksize + cm->checksumsize, result);
|
|
memset(ipad, 0, cm->blocksize + len);
|
|
free(ipad);
|
|
memset(opad, 0, cm->blocksize + cm->checksumsize);
|
|
free(opad);
|
|
}
|
|
|
|
static void
|
|
HMAC_SHA1_DES3_checksum(krb5_context context,
|
|
struct key_data *key,
|
|
void *data,
|
|
size_t len,
|
|
Checksum *result)
|
|
{
|
|
struct checksum_type *c = _find_checksum(CKSUMTYPE_SHA1);
|
|
|
|
hmac(context, c, data, len, key, result);
|
|
}
|
|
|
|
struct checksum_type checksum_none = {
|
|
CKSUMTYPE_NONE,
|
|
"none",
|
|
1,
|
|
0,
|
|
0,
|
|
NONE_checksum,
|
|
NULL
|
|
};
|
|
struct checksum_type checksum_crc32 = {
|
|
CKSUMTYPE_CRC32,
|
|
"crc32",
|
|
1,
|
|
4,
|
|
0,
|
|
CRC32_checksum,
|
|
NULL
|
|
};
|
|
struct checksum_type checksum_rsa_md4 = {
|
|
CKSUMTYPE_RSA_MD4,
|
|
"rsa-md4",
|
|
64,
|
|
16,
|
|
F_CPROOF,
|
|
RSA_MD4_checksum,
|
|
NULL
|
|
};
|
|
struct checksum_type checksum_rsa_md4_des = {
|
|
CKSUMTYPE_RSA_MD4_DES,
|
|
"rsa-md4-des",
|
|
64,
|
|
24,
|
|
F_KEYED | F_CPROOF | F_VARIANT,
|
|
RSA_MD4_DES_checksum,
|
|
RSA_MD4_DES_verify
|
|
};
|
|
#if 0
|
|
struct checksum_type checksum_des_mac = {
|
|
CKSUMTYPE_DES_MAC,
|
|
"des-mac",
|
|
0,
|
|
0,
|
|
0,
|
|
DES_MAC_checksum,
|
|
};
|
|
struct checksum_type checksum_des_mac_k = {
|
|
CKSUMTYPE_DES_MAC_K,
|
|
"des-mac-k",
|
|
0,
|
|
0,
|
|
0,
|
|
DES_MAC_K_checksum,
|
|
};
|
|
struct checksum_type checksum_rsa_md4_des_k = {
|
|
CKSUMTYPE_RSA_MD4_DES_K,
|
|
"rsa-md4-des-k",
|
|
0,
|
|
0,
|
|
0,
|
|
RSA_MD4_DES_K_checksum,
|
|
RSA_MD4_DES_K_verify,
|
|
};
|
|
#endif
|
|
struct checksum_type checksum_rsa_md5 = {
|
|
CKSUMTYPE_RSA_MD5,
|
|
"rsa-md5",
|
|
64,
|
|
16,
|
|
F_CPROOF,
|
|
RSA_MD5_checksum,
|
|
NULL
|
|
};
|
|
struct checksum_type checksum_rsa_md5_des = {
|
|
CKSUMTYPE_RSA_MD5_DES,
|
|
"rsa-md5-des",
|
|
64,
|
|
24,
|
|
F_KEYED | F_CPROOF | F_VARIANT,
|
|
RSA_MD5_DES_checksum,
|
|
RSA_MD5_DES_verify,
|
|
};
|
|
struct checksum_type checksum_rsa_md5_des3 = {
|
|
CKSUMTYPE_RSA_MD5_DES3,
|
|
"rsa-md5-des3",
|
|
64,
|
|
24,
|
|
F_KEYED | F_CPROOF | F_VARIANT,
|
|
RSA_MD5_DES3_checksum,
|
|
RSA_MD5_DES3_verify,
|
|
};
|
|
struct checksum_type checksum_sha1 = {
|
|
CKSUMTYPE_SHA1,
|
|
"sha1",
|
|
64,
|
|
20,
|
|
F_CPROOF,
|
|
SHA1_checksum,
|
|
NULL
|
|
};
|
|
struct checksum_type checksum_hmac_sha1_des3 = {
|
|
CKSUMTYPE_HMAC_SHA1_DES3,
|
|
"hmac-sha1-des3",
|
|
64,
|
|
20,
|
|
F_KEYED | F_CPROOF | F_DERIVED,
|
|
HMAC_SHA1_DES3_checksum,
|
|
NULL
|
|
};
|
|
|
|
struct checksum_type *checksum_types[] = {
|
|
&checksum_none,
|
|
&checksum_crc32,
|
|
&checksum_rsa_md4,
|
|
&checksum_rsa_md4_des,
|
|
#if 0
|
|
&checksum_des_mac,
|
|
&checksum_des_mac_k,
|
|
&checksum_rsa_md4_des_k,
|
|
#endif
|
|
&checksum_rsa_md5,
|
|
&checksum_rsa_md5_des,
|
|
&checksum_rsa_md5_des3,
|
|
&checksum_sha1,
|
|
&checksum_hmac_sha1_des3
|
|
};
|
|
|
|
static int num_checksums = sizeof(checksum_types) / sizeof(checksum_types[0]);
|
|
|
|
static struct checksum_type *
|
|
_find_checksum(krb5_cksumtype type)
|
|
{
|
|
int i;
|
|
for(i = 0; i < num_checksums; i++)
|
|
if(checksum_types[i]->type == type)
|
|
return checksum_types[i];
|
|
return NULL;
|
|
}
|
|
|
|
static krb5_error_code
|
|
get_checksum_key(krb5_context context,
|
|
krb5_crypto crypto,
|
|
unsigned usage, /* not krb5_key_usage */
|
|
struct checksum_type *ct,
|
|
struct key_data **key)
|
|
{
|
|
krb5_error_code ret = 0;
|
|
|
|
if(ct->flags & F_DERIVED)
|
|
ret = _get_derived_key(context, crypto, usage, key);
|
|
else if(ct->flags & F_VARIANT) {
|
|
int i;
|
|
|
|
*key = _new_derived_key(crypto, 0xff/* KRB5_KU_RFC1510_VARIANT */);
|
|
if(*key == NULL)
|
|
return ENOMEM;
|
|
ret = krb5_copy_keyblock(context, crypto->key.key, &(*key)->key);
|
|
if(ret)
|
|
return ret;
|
|
for(i = 0; i < (*key)->key->keyvalue.length; i++)
|
|
((unsigned char*)(*key)->key->keyvalue.data)[i] ^= 0xF0;
|
|
} else {
|
|
*key = &crypto->key;
|
|
}
|
|
if(ret == 0)
|
|
ret = _key_schedule(context, *key);
|
|
return ret;
|
|
}
|
|
|
|
static krb5_error_code
|
|
do_checksum (krb5_context context,
|
|
struct checksum_type *ct,
|
|
krb5_crypto crypto,
|
|
unsigned usage,
|
|
void *data,
|
|
size_t len,
|
|
Checksum *result)
|
|
{
|
|
krb5_error_code ret;
|
|
struct key_data *dkey;
|
|
int keyed_checksum;
|
|
|
|
keyed_checksum = (ct->flags & F_KEYED) != 0;
|
|
if(keyed_checksum && crypto == NULL)
|
|
return KRB5_PROG_SUMTYPE_NOSUPP; /* XXX */
|
|
if(keyed_checksum)
|
|
ret = get_checksum_key(context, crypto, usage, ct, &dkey);
|
|
else
|
|
dkey = NULL;
|
|
result->cksumtype = ct->type;
|
|
krb5_data_alloc(&result->checksum, ct->checksumsize);
|
|
(*ct->checksum)(context, dkey, data, len, result);
|
|
return 0;
|
|
}
|
|
|
|
static krb5_error_code
|
|
create_checksum(krb5_context context,
|
|
krb5_crypto crypto,
|
|
unsigned usage, /* not krb5_key_usage */
|
|
krb5_cksumtype type, /* if crypto == NULL */
|
|
void *data,
|
|
size_t len,
|
|
Checksum *result)
|
|
{
|
|
struct checksum_type *ct;
|
|
|
|
if(crypto) {
|
|
ct = crypto->et->keyed_checksum;
|
|
if(ct == NULL)
|
|
ct = crypto->et->cksumtype;
|
|
} else
|
|
ct = _find_checksum(type);
|
|
if(ct == NULL)
|
|
return KRB5_PROG_SUMTYPE_NOSUPP;
|
|
return do_checksum (context, ct, crypto, usage, data, len, result);
|
|
}
|
|
|
|
krb5_error_code
|
|
krb5_create_checksum(krb5_context context,
|
|
krb5_crypto crypto,
|
|
unsigned usage_or_type,
|
|
void *data,
|
|
size_t len,
|
|
Checksum *result)
|
|
{
|
|
return create_checksum(context, crypto,
|
|
CHECKSUM_USAGE(usage_or_type),
|
|
usage_or_type, data, len, result);
|
|
}
|
|
|
|
static krb5_error_code
|
|
verify_checksum(krb5_context context,
|
|
krb5_crypto crypto,
|
|
unsigned usage, /* not krb5_key_usage */
|
|
void *data,
|
|
size_t len,
|
|
Checksum *cksum)
|
|
{
|
|
krb5_error_code ret;
|
|
struct key_data *dkey;
|
|
int keyed_checksum;
|
|
Checksum c;
|
|
struct checksum_type *ct;
|
|
|
|
ct = _find_checksum(cksum->cksumtype);
|
|
if(ct == NULL)
|
|
return KRB5_PROG_SUMTYPE_NOSUPP;
|
|
if(ct->checksumsize != cksum->checksum.length)
|
|
return KRB5KRB_AP_ERR_BAD_INTEGRITY; /* XXX */
|
|
keyed_checksum = (ct->flags & F_KEYED) != 0;
|
|
if(keyed_checksum && crypto == NULL)
|
|
return KRB5_PROG_SUMTYPE_NOSUPP; /* XXX */
|
|
if(keyed_checksum)
|
|
ret = get_checksum_key(context, crypto, usage, ct, &dkey);
|
|
else
|
|
dkey = NULL;
|
|
if(ct->verify)
|
|
return (*ct->verify)(context, dkey, data, len, cksum);
|
|
|
|
ret = krb5_data_alloc (&c.checksum, ct->checksumsize);
|
|
if (ret)
|
|
return ret;
|
|
|
|
(*ct->checksum)(context, dkey, data, len, &c);
|
|
|
|
if(c.checksum.length != cksum->checksum.length ||
|
|
memcmp(c.checksum.data, cksum->checksum.data, c.checksum.length))
|
|
ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
|
|
else
|
|
ret = 0;
|
|
krb5_data_free (&c.checksum);
|
|
return ret;
|
|
}
|
|
|
|
krb5_error_code
|
|
krb5_verify_checksum(krb5_context context,
|
|
krb5_crypto crypto,
|
|
krb5_key_usage usage,
|
|
void *data,
|
|
size_t len,
|
|
Checksum *cksum)
|
|
{
|
|
return verify_checksum(context, crypto,
|
|
CHECKSUM_USAGE(usage), data, len, cksum);
|
|
}
|
|
|
|
krb5_error_code
|
|
krb5_checksumsize(krb5_context context,
|
|
krb5_cksumtype type,
|
|
size_t *size)
|
|
{
|
|
struct checksum_type *ct = _find_checksum(type);
|
|
if(ct == NULL)
|
|
return KRB5_PROG_SUMTYPE_NOSUPP;
|
|
*size = ct->checksumsize;
|
|
return 0;
|
|
}
|
|
|
|
krb5_boolean
|
|
krb5_checksum_is_keyed(krb5_context context,
|
|
krb5_cksumtype type)
|
|
{
|
|
struct checksum_type *ct = _find_checksum(type);
|
|
if(ct == NULL)
|
|
return KRB5_PROG_SUMTYPE_NOSUPP;
|
|
return ct->flags & F_KEYED;
|
|
}
|
|
|
|
krb5_boolean
|
|
krb5_checksum_is_collision_proof(krb5_context context,
|
|
krb5_cksumtype type)
|
|
{
|
|
struct checksum_type *ct = _find_checksum(type);
|
|
if(ct == NULL)
|
|
return KRB5_PROG_SUMTYPE_NOSUPP;
|
|
return ct->flags & F_CPROOF;
|
|
}
|
|
|
|
/************************************************************
|
|
* *
|
|
************************************************************/
|
|
|
|
static void
|
|
NULL_encrypt(struct key_data *key,
|
|
void *data,
|
|
size_t len,
|
|
krb5_boolean encrypt)
|
|
{
|
|
}
|
|
|
|
static void
|
|
DES_CBC_encrypt_null_ivec(struct key_data *key,
|
|
void *data,
|
|
size_t len,
|
|
krb5_boolean encrypt)
|
|
{
|
|
des_cblock ivec;
|
|
des_key_schedule *s = key->schedule->data;
|
|
memset(&ivec, 0, sizeof(ivec));
|
|
des_cbc_encrypt(data, data, len, *s, &ivec, encrypt);
|
|
}
|
|
|
|
static void
|
|
DES_CBC_encrypt_key_ivec(struct key_data *key,
|
|
void *data,
|
|
size_t len,
|
|
krb5_boolean encrypt)
|
|
{
|
|
des_cblock ivec;
|
|
des_key_schedule *s = key->schedule->data;
|
|
memcpy(&ivec, key->key->keyvalue.data, sizeof(ivec));
|
|
des_cbc_encrypt(data, data, len, *s, &ivec, encrypt);
|
|
}
|
|
|
|
static void
|
|
DES3_CBC_encrypt(struct key_data *key,
|
|
void *data,
|
|
size_t len,
|
|
krb5_boolean encrypt)
|
|
{
|
|
des_cblock ivec;
|
|
des_key_schedule *s = key->schedule->data;
|
|
memset(&ivec, 0, sizeof(ivec));
|
|
des_ede3_cbc_encrypt(data, data, len, s[0], s[1], s[2], &ivec, encrypt);
|
|
}
|
|
|
|
static void
|
|
ARCFOUR_encrypt(struct key_data *key,
|
|
void *data,
|
|
size_t len,
|
|
krb5_boolean encrypt)
|
|
{
|
|
|
|
}
|
|
|
|
/*
|
|
* these should currently be in reverse preference order.
|
|
*/
|
|
|
|
static struct encryption_type etypes[] = {
|
|
{
|
|
ETYPE_NULL,
|
|
"null",
|
|
1,
|
|
0,
|
|
&keytype_null,
|
|
&checksum_none,
|
|
NULL,
|
|
0,
|
|
NULL_encrypt,
|
|
},
|
|
{
|
|
ETYPE_DES_CBC_CRC,
|
|
"des-cbc-crc",
|
|
8,
|
|
8,
|
|
&keytype_des,
|
|
&checksum_crc32,
|
|
NULL,
|
|
0,
|
|
DES_CBC_encrypt_key_ivec,
|
|
},
|
|
{
|
|
ETYPE_DES_CBC_MD4,
|
|
"des-cbc-md4",
|
|
8,
|
|
8,
|
|
&keytype_des,
|
|
&checksum_rsa_md4,
|
|
&checksum_rsa_md4_des,
|
|
0,
|
|
DES_CBC_encrypt_null_ivec,
|
|
},
|
|
{
|
|
ETYPE_DES_CBC_MD5,
|
|
"des-cbc-md5",
|
|
8,
|
|
8,
|
|
&keytype_des,
|
|
&checksum_rsa_md5,
|
|
&checksum_rsa_md5_des,
|
|
0,
|
|
DES_CBC_encrypt_null_ivec,
|
|
},
|
|
{
|
|
ETYPE_DES3_CBC_MD5,
|
|
"des3-cbc-md5",
|
|
8,
|
|
8,
|
|
&keytype_des3,
|
|
&checksum_rsa_md5,
|
|
&checksum_rsa_md5_des3,
|
|
0,
|
|
DES3_CBC_encrypt,
|
|
},
|
|
{
|
|
ETYPE_DES3_CBC_SHA1,
|
|
"des3-cbc-sha1",
|
|
8,
|
|
8,
|
|
&keytype_des3_derived,
|
|
&checksum_sha1,
|
|
&checksum_hmac_sha1_des3,
|
|
F_DERIVED,
|
|
DES3_CBC_encrypt,
|
|
},
|
|
{
|
|
ETYPE_OLD_DES3_CBC_SHA1,
|
|
"old-des3-cbc-sha1",
|
|
8,
|
|
8,
|
|
&keytype_des3,
|
|
&checksum_sha1,
|
|
&checksum_hmac_sha1_des3,
|
|
0,
|
|
DES3_CBC_encrypt,
|
|
},
|
|
{
|
|
ETYPE_DES_CBC_NONE,
|
|
"des-cbc-none",
|
|
8,
|
|
0,
|
|
&keytype_des,
|
|
&checksum_none,
|
|
NULL,
|
|
F_PSEUDO,
|
|
DES_CBC_encrypt_null_ivec,
|
|
},
|
|
{
|
|
ETYPE_DES3_CBC_NONE,
|
|
"des3-cbc-none",
|
|
8,
|
|
0,
|
|
&keytype_des3_derived,
|
|
&checksum_none,
|
|
NULL,
|
|
F_PSEUDO,
|
|
DES_CBC_encrypt_null_ivec,
|
|
},
|
|
};
|
|
|
|
static unsigned num_etypes = sizeof(etypes) / sizeof(etypes[0]);
|
|
|
|
|
|
static struct encryption_type *
|
|
_find_enctype(krb5_enctype type)
|
|
{
|
|
int i;
|
|
for(i = 0; i < num_etypes; i++)
|
|
if(etypes[i].type == type)
|
|
return &etypes[i];
|
|
return NULL;
|
|
}
|
|
|
|
|
|
krb5_error_code
|
|
krb5_enctype_to_string(krb5_context context,
|
|
krb5_enctype etype,
|
|
char **string)
|
|
{
|
|
struct encryption_type *e;
|
|
e = _find_enctype(etype);
|
|
if(e == NULL)
|
|
return KRB5_PROG_ETYPE_NOSUPP;
|
|
*string = strdup(e->name);
|
|
if(*string == NULL)
|
|
return ENOMEM;
|
|
return 0;
|
|
}
|
|
|
|
krb5_error_code
|
|
krb5_string_to_enctype(krb5_context context,
|
|
const char *string,
|
|
krb5_enctype *etype)
|
|
{
|
|
int i;
|
|
for(i = 0; i < num_etypes; i++)
|
|
if(strcasecmp(etypes[i].name, string) == 0){
|
|
*etype = etypes[i].type;
|
|
return 0;
|
|
}
|
|
return KRB5_PROG_ETYPE_NOSUPP;
|
|
}
|
|
|
|
krb5_error_code
|
|
krb5_enctype_to_keytype(krb5_context context,
|
|
krb5_enctype etype,
|
|
krb5_keytype *keytype)
|
|
{
|
|
struct encryption_type *e = _find_enctype(etype);
|
|
if(e == NULL)
|
|
return KRB5_PROG_ETYPE_NOSUPP;
|
|
*keytype = e->keytype->type; /* XXX */
|
|
return 0;
|
|
}
|
|
|
|
#if 0
|
|
krb5_error_code
|
|
krb5_keytype_to_enctype(krb5_context context,
|
|
krb5_keytype keytype,
|
|
krb5_enctype *etype)
|
|
{
|
|
struct key_type *kt = _find_keytype(keytype);
|
|
krb5_warnx(context, "krb5_keytype_to_enctype(%u)", keytype);
|
|
if(kt == NULL)
|
|
return KRB5_PROG_KEYTYPE_NOSUPP;
|
|
*etype = kt->best_etype;
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
krb5_error_code
|
|
krb5_keytype_to_enctypes (krb5_context context,
|
|
krb5_keytype keytype,
|
|
unsigned *len,
|
|
int **val)
|
|
{
|
|
int i;
|
|
unsigned n = 0;
|
|
int *ret;
|
|
|
|
for (i = num_etypes - 1; i >= 0; --i) {
|
|
if (etypes[i].keytype->type == keytype
|
|
&& !(etypes[i].flags & F_PSEUDO))
|
|
++n;
|
|
}
|
|
ret = malloc(n * sizeof(int));
|
|
if (ret == NULL && n != 0)
|
|
return ENOMEM;
|
|
n = 0;
|
|
for (i = num_etypes - 1; i >= 0; --i) {
|
|
if (etypes[i].keytype->type == keytype
|
|
&& !(etypes[i].flags & F_PSEUDO))
|
|
ret[n++] = etypes[i].type;
|
|
}
|
|
*len = n;
|
|
*val = ret;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* First take the configured list of etypes for `keytype' if available,
|
|
* else, do `krb5_keytype_to_enctypes'.
|
|
*/
|
|
|
|
krb5_error_code
|
|
krb5_keytype_to_enctypes_default (krb5_context context,
|
|
krb5_keytype keytype,
|
|
unsigned *len,
|
|
int **val)
|
|
{
|
|
int i, n;
|
|
int *ret;
|
|
|
|
if (keytype != KEYTYPE_DES || context->etypes_des == NULL)
|
|
return krb5_keytype_to_enctypes (context, keytype, len, val);
|
|
|
|
for (n = 0; context->etypes_des[n]; ++n)
|
|
;
|
|
ret = malloc (n * sizeof(*ret));
|
|
if (ret == NULL && n != 0)
|
|
return ENOMEM;
|
|
for (i = 0; i < n; ++i)
|
|
ret[i] = context->etypes_des[i];
|
|
*len = n;
|
|
*val = ret;
|
|
return 0;
|
|
}
|
|
|
|
krb5_error_code
|
|
krb5_enctype_valid(krb5_context context,
|
|
krb5_enctype etype)
|
|
{
|
|
return _find_enctype(etype) != NULL;
|
|
}
|
|
|
|
/* if two enctypes have compatible keys */
|
|
krb5_boolean
|
|
krb5_enctypes_compatible_keys(krb5_context context,
|
|
krb5_enctype etype1,
|
|
krb5_enctype etype2)
|
|
{
|
|
struct encryption_type *e1 = _find_enctype(etype1);
|
|
struct encryption_type *e2 = _find_enctype(etype2);
|
|
return e1 != NULL && e2 != NULL && e1->keytype == e2->keytype;
|
|
}
|
|
|
|
static krb5_boolean
|
|
derived_crypto(krb5_context context,
|
|
krb5_crypto crypto)
|
|
{
|
|
return (crypto->et->flags & F_DERIVED) != 0;
|
|
}
|
|
|
|
|
|
#define CHECKSUMSIZE(C) ((C)->checksumsize)
|
|
#define CHECKSUMTYPE(C) ((C)->type)
|
|
|
|
static krb5_error_code
|
|
encrypt_internal_derived(krb5_context context,
|
|
krb5_crypto crypto,
|
|
unsigned usage,
|
|
void *data,
|
|
size_t len,
|
|
krb5_data *result)
|
|
{
|
|
size_t sz, block_sz, checksum_sz;
|
|
Checksum cksum;
|
|
unsigned char *p, *q;
|
|
krb5_error_code ret;
|
|
struct key_data *dkey;
|
|
struct encryption_type *et = crypto->et;
|
|
|
|
checksum_sz = CHECKSUMSIZE(et->keyed_checksum);
|
|
|
|
sz = et->confoundersize + /* 4 - length */ len;
|
|
block_sz = (sz + et->blocksize - 1) &~ (et->blocksize - 1); /* pad */
|
|
p = calloc(1, block_sz + checksum_sz);
|
|
if(p == NULL)
|
|
return ENOMEM;
|
|
|
|
q = p;
|
|
krb5_generate_random_block(q, et->confoundersize); /* XXX */
|
|
q += et->confoundersize;
|
|
memcpy(q, data, len);
|
|
|
|
ret = create_checksum(context,
|
|
crypto,
|
|
INTEGRITY_USAGE(usage),
|
|
0,
|
|
p,
|
|
block_sz,
|
|
&cksum);
|
|
if(ret == 0 && cksum.checksum.length != checksum_sz)
|
|
ret = KRB5_CRYPTO_INTERNAL;
|
|
if(ret) {
|
|
memset(p, 0, block_sz + checksum_sz);
|
|
free(p);
|
|
return ret;
|
|
}
|
|
memcpy(p + block_sz, cksum.checksum.data, cksum.checksum.length);
|
|
ret = _get_derived_key(context, crypto, ENCRYPTION_USAGE(usage), &dkey);
|
|
if(ret) {
|
|
memset(p, 0, block_sz + checksum_sz);
|
|
free(p);
|
|
return ret;
|
|
}
|
|
ret = _key_schedule(context, dkey);
|
|
if(ret) {
|
|
memset(p, 0, block_sz);
|
|
free(p);
|
|
return ret;
|
|
}
|
|
#ifdef CRYPTO_DEBUG
|
|
krb5_crypto_debug(context, 1, block_sz, dkey->key);
|
|
#endif
|
|
(*et->encrypt)(dkey, p, block_sz, 1);
|
|
result->data = p;
|
|
result->length = block_sz + checksum_sz;
|
|
return 0;
|
|
}
|
|
|
|
static krb5_error_code
|
|
encrypt_internal(krb5_context context,
|
|
krb5_crypto crypto,
|
|
void *data,
|
|
size_t len,
|
|
krb5_data *result)
|
|
{
|
|
size_t sz, block_sz, checksum_sz;
|
|
Checksum cksum;
|
|
unsigned char *p, *q;
|
|
krb5_error_code ret;
|
|
struct encryption_type *et = crypto->et;
|
|
|
|
checksum_sz = CHECKSUMSIZE(et->cksumtype);
|
|
|
|
sz = et->confoundersize + checksum_sz + len;
|
|
block_sz = (sz + et->blocksize - 1) &~ (et->blocksize - 1); /* pad */
|
|
p = calloc(1, block_sz);
|
|
if(p == NULL)
|
|
return ENOMEM;
|
|
|
|
q = p;
|
|
krb5_generate_random_block(q, et->confoundersize); /* XXX */
|
|
q += et->confoundersize;
|
|
memset(q, 0, checksum_sz);
|
|
q += checksum_sz;
|
|
memcpy(q, data, len);
|
|
|
|
ret = create_checksum(context,
|
|
NULL,
|
|
0,
|
|
CHECKSUMTYPE(et->cksumtype),
|
|
p,
|
|
block_sz,
|
|
&cksum);
|
|
if(ret == 0 && cksum.checksum.length != checksum_sz) {
|
|
free_Checksum (&cksum);
|
|
ret = KRB5_CRYPTO_INTERNAL;
|
|
}
|
|
if(ret) {
|
|
memset(p, 0, block_sz);
|
|
free(p);
|
|
free_Checksum(&cksum);
|
|
return ret;
|
|
}
|
|
memcpy(p + et->confoundersize, cksum.checksum.data, cksum.checksum.length);
|
|
free_Checksum(&cksum);
|
|
ret = _key_schedule(context, &crypto->key);
|
|
if(ret) {
|
|
memset(p, 0, block_sz);
|
|
free(p);
|
|
return ret;
|
|
}
|
|
#ifdef CRYPTO_DEBUG
|
|
krb5_crypto_debug(context, 1, block_sz, crypto->key.key);
|
|
#endif
|
|
(*et->encrypt)(&crypto->key, p, block_sz, 1);
|
|
result->data = p;
|
|
result->length = block_sz;
|
|
return 0;
|
|
}
|
|
|
|
static krb5_error_code
|
|
decrypt_internal_derived(krb5_context context,
|
|
krb5_crypto crypto,
|
|
unsigned usage,
|
|
void *data,
|
|
size_t len,
|
|
krb5_data *result)
|
|
{
|
|
size_t checksum_sz;
|
|
Checksum cksum;
|
|
unsigned char *p;
|
|
krb5_error_code ret;
|
|
struct key_data *dkey;
|
|
struct encryption_type *et = crypto->et;
|
|
unsigned long l;
|
|
|
|
p = malloc(len);
|
|
if(len != 0 && p == NULL)
|
|
return ENOMEM;
|
|
memcpy(p, data, len);
|
|
|
|
checksum_sz = CHECKSUMSIZE(et->keyed_checksum);
|
|
len -= checksum_sz;
|
|
|
|
ret = _get_derived_key(context, crypto, ENCRYPTION_USAGE(usage), &dkey);
|
|
if(ret) {
|
|
free(p);
|
|
return ret;
|
|
}
|
|
ret = _key_schedule(context, dkey);
|
|
if(ret) {
|
|
free(p);
|
|
return ret;
|
|
}
|
|
#ifdef CRYPTO_DEBUG
|
|
krb5_crypto_debug(context, 0, len, dkey->key);
|
|
#endif
|
|
(*et->encrypt)(dkey, p, len, 0);
|
|
|
|
cksum.checksum.data = p + len;
|
|
cksum.checksum.length = checksum_sz;
|
|
cksum.cksumtype = CHECKSUMTYPE(et->keyed_checksum);
|
|
|
|
ret = verify_checksum(context,
|
|
crypto,
|
|
INTEGRITY_USAGE(usage),
|
|
p,
|
|
len,
|
|
&cksum);
|
|
if(ret) {
|
|
free(p);
|
|
return ret;
|
|
}
|
|
l = len - et->confoundersize;
|
|
memmove(p, p + et->confoundersize, l);
|
|
result->data = realloc(p, l);
|
|
if(p == NULL) {
|
|
free(p);
|
|
return ENOMEM;
|
|
}
|
|
result->length = l;
|
|
return 0;
|
|
}
|
|
|
|
static krb5_error_code
|
|
decrypt_internal(krb5_context context,
|
|
krb5_crypto crypto,
|
|
void *data,
|
|
size_t len,
|
|
krb5_data *result)
|
|
{
|
|
krb5_error_code ret;
|
|
unsigned char *p;
|
|
Checksum cksum;
|
|
size_t checksum_sz, l;
|
|
struct encryption_type *et = crypto->et;
|
|
|
|
checksum_sz = CHECKSUMSIZE(et->cksumtype);
|
|
p = malloc(len);
|
|
if(len != 0 && p == NULL)
|
|
return ENOMEM;
|
|
memcpy(p, data, len);
|
|
|
|
ret = _key_schedule(context, &crypto->key);
|
|
if(ret) {
|
|
free(p);
|
|
return ret;
|
|
}
|
|
#ifdef CRYPTO_DEBUG
|
|
krb5_crypto_debug(context, 0, len, crypto->key.key);
|
|
#endif
|
|
(*et->encrypt)(&crypto->key, p, len, 0);
|
|
ret = krb5_data_copy(&cksum.checksum, p + et->confoundersize, checksum_sz);
|
|
if(ret) {
|
|
free(p);
|
|
return ret;
|
|
}
|
|
memset(p + et->confoundersize, 0, checksum_sz);
|
|
cksum.cksumtype = CHECKSUMTYPE(et->cksumtype);
|
|
ret = verify_checksum(context, NULL, 0, p, len, &cksum);
|
|
free_Checksum(&cksum);
|
|
if(ret) {
|
|
free(p);
|
|
return ret;
|
|
}
|
|
l = len - et->confoundersize - checksum_sz;
|
|
memmove(p, p + et->confoundersize + checksum_sz, l);
|
|
result->data = realloc(p, l);
|
|
if(result->data == NULL) {
|
|
free(p);
|
|
return ENOMEM;
|
|
}
|
|
result->length = l;
|
|
return 0;
|
|
}
|
|
|
|
krb5_error_code
|
|
krb5_encrypt(krb5_context context,
|
|
krb5_crypto crypto,
|
|
unsigned usage,
|
|
void *data,
|
|
size_t len,
|
|
krb5_data *result)
|
|
{
|
|
if(derived_crypto(context, crypto))
|
|
return encrypt_internal_derived(context, crypto, usage,
|
|
data, len, result);
|
|
else
|
|
return encrypt_internal(context, crypto, data, len, result);
|
|
}
|
|
|
|
krb5_error_code
|
|
krb5_encrypt_EncryptedData(krb5_context context,
|
|
krb5_crypto crypto,
|
|
unsigned usage,
|
|
void *data,
|
|
size_t len,
|
|
int kvno,
|
|
EncryptedData *result)
|
|
{
|
|
result->etype = CRYPTO_ETYPE(crypto);
|
|
if(kvno){
|
|
ALLOC(result->kvno, 1);
|
|
*result->kvno = kvno;
|
|
}else
|
|
result->kvno = NULL;
|
|
return krb5_encrypt(context, crypto, usage, data, len, &result->cipher);
|
|
}
|
|
|
|
krb5_error_code
|
|
krb5_decrypt(krb5_context context,
|
|
krb5_crypto crypto,
|
|
unsigned usage,
|
|
void *data,
|
|
size_t len,
|
|
krb5_data *result)
|
|
{
|
|
if(derived_crypto(context, crypto))
|
|
return decrypt_internal_derived(context, crypto, usage,
|
|
data, len, result);
|
|
else
|
|
return decrypt_internal(context, crypto, data, len, result);
|
|
}
|
|
|
|
krb5_error_code
|
|
krb5_decrypt_EncryptedData(krb5_context context,
|
|
krb5_crypto crypto,
|
|
unsigned usage,
|
|
EncryptedData *e,
|
|
krb5_data *result)
|
|
{
|
|
return krb5_decrypt(context, crypto, usage,
|
|
e->cipher.data, e->cipher.length, result);
|
|
}
|
|
|
|
/************************************************************
|
|
* *
|
|
************************************************************/
|
|
|
|
void
|
|
krb5_generate_random_block(void *buf, size_t len)
|
|
{
|
|
des_cblock key, out;
|
|
static des_cblock counter;
|
|
static des_key_schedule schedule;
|
|
int i;
|
|
static int initialized = 0;
|
|
|
|
if(!initialized) {
|
|
des_new_random_key(&key);
|
|
des_set_key(&key, schedule);
|
|
memset(&key, 0, sizeof(key));
|
|
des_new_random_key(&counter);
|
|
}
|
|
while(len > 0) {
|
|
des_ecb_encrypt(&counter, &out, schedule, DES_ENCRYPT);
|
|
for(i = 7; i >=0; i--)
|
|
if(counter[i]++)
|
|
break;
|
|
memcpy(buf, out, min(len, sizeof(out)));
|
|
len -= min(len, sizeof(out));
|
|
buf = (char*)buf + sizeof(out);
|
|
}
|
|
}
|
|
|
|
static void
|
|
DES3_postproc(krb5_context context,
|
|
unsigned char *k, size_t len, struct key_data *key)
|
|
{
|
|
unsigned char x[24];
|
|
int i, j;
|
|
|
|
memset(x, 0, sizeof(x));
|
|
for (i = 0; i < 3; ++i) {
|
|
unsigned char foo;
|
|
|
|
for (j = 0; j < 7; ++j) {
|
|
unsigned char b = k[7 * i + j];
|
|
|
|
x[8 * i + j] = b;
|
|
}
|
|
foo = 0;
|
|
for (j = 6; j >= 0; --j) {
|
|
foo |= k[7 * i + j] & 1;
|
|
foo <<= 1;
|
|
}
|
|
x[8 * i + 7] = foo;
|
|
}
|
|
k = key->key->keyvalue.data;
|
|
memcpy(k, x, 24);
|
|
memset(x, 0, sizeof(x));
|
|
if (key->schedule) {
|
|
krb5_free_data(context, key->schedule);
|
|
key->schedule = NULL;
|
|
}
|
|
des_set_odd_parity((des_cblock*)k);
|
|
des_set_odd_parity((des_cblock*)(k + 8));
|
|
des_set_odd_parity((des_cblock*)(k + 16));
|
|
}
|
|
|
|
static krb5_error_code
|
|
derive_key(krb5_context context,
|
|
struct encryption_type *et,
|
|
struct key_data *key,
|
|
void *constant,
|
|
size_t len)
|
|
{
|
|
unsigned char *k;
|
|
unsigned int nblocks = 0, i;
|
|
krb5_error_code ret = 0;
|
|
|
|
struct key_type *kt = et->keytype;
|
|
ret = _key_schedule(context, key);
|
|
if(ret)
|
|
return ret;
|
|
if(et->blocksize * 8 < kt->bits ||
|
|
len != et->blocksize) {
|
|
nblocks = (kt->bits + et->blocksize * 8 - 1) / (et->blocksize * 8);
|
|
k = malloc(nblocks * et->blocksize);
|
|
if(k == NULL)
|
|
return ENOMEM;
|
|
_krb5_n_fold(constant, len, k, et->blocksize);
|
|
for(i = 0; i < nblocks; i++) {
|
|
if(i > 0)
|
|
memcpy(k + i * et->blocksize,
|
|
k + (i - 1) * et->blocksize,
|
|
et->blocksize);
|
|
(*et->encrypt)(key, k + i * et->blocksize, et->blocksize, 1);
|
|
}
|
|
} else {
|
|
void *c = malloc(len);
|
|
size_t res_len = (kt->bits + 7) / 8;
|
|
|
|
if(len != 0 && c == NULL)
|
|
return ENOMEM;
|
|
memcpy(c, constant, len);
|
|
(*et->encrypt)(key, c, len, 1);
|
|
k = malloc(res_len);
|
|
if(res_len != 0 && k == NULL)
|
|
return ENOMEM;
|
|
_krb5_n_fold(c, len, k, res_len);
|
|
free(c);
|
|
}
|
|
|
|
/* XXX keytype dependent post-processing */
|
|
switch(kt->type) {
|
|
case KEYTYPE_DES3:
|
|
DES3_postproc(context, k, nblocks * et->blocksize, key);
|
|
break;
|
|
default:
|
|
krb5_warnx(context, "derive_key() called with unknown keytype (%u)",
|
|
kt->type);
|
|
ret = KRB5_CRYPTO_INTERNAL;
|
|
break;
|
|
}
|
|
memset(k, 0, nblocks * et->blocksize);
|
|
free(k);
|
|
return ret;
|
|
}
|
|
|
|
static struct key_data *
|
|
_new_derived_key(krb5_crypto crypto, unsigned usage)
|
|
{
|
|
struct key_usage *d = crypto->key_usage;
|
|
d = realloc(d, (crypto->num_key_usage + 1) * sizeof(*d));
|
|
if(d == NULL)
|
|
return NULL;
|
|
crypto->key_usage = d;
|
|
d += crypto->num_key_usage++;
|
|
memset(d, 0, sizeof(*d));
|
|
d->usage = usage;
|
|
return &d->key;
|
|
}
|
|
|
|
static krb5_error_code
|
|
_get_derived_key(krb5_context context,
|
|
krb5_crypto crypto,
|
|
unsigned usage,
|
|
struct key_data **key)
|
|
{
|
|
int i;
|
|
struct key_data *d;
|
|
unsigned char constant[5];
|
|
|
|
for(i = 0; i < crypto->num_key_usage; i++)
|
|
if(crypto->key_usage[i].usage == usage) {
|
|
*key = &crypto->key_usage[i].key;
|
|
return 0;
|
|
}
|
|
d = _new_derived_key(crypto, usage);
|
|
if(d == NULL)
|
|
return ENOMEM;
|
|
krb5_copy_keyblock(context, crypto->key.key, &d->key);
|
|
_krb5_put_int(constant, usage, 5);
|
|
derive_key(context, crypto->et, d, constant, sizeof(constant));
|
|
*key = d;
|
|
return 0;
|
|
}
|
|
|
|
|
|
krb5_error_code
|
|
krb5_crypto_init(krb5_context context,
|
|
krb5_keyblock *key,
|
|
krb5_enctype etype,
|
|
krb5_crypto *crypto)
|
|
{
|
|
krb5_error_code ret;
|
|
ALLOC(*crypto, 1);
|
|
if(*crypto == NULL)
|
|
return ENOMEM;
|
|
if(etype == ETYPE_NULL)
|
|
etype = key->keytype;
|
|
(*crypto)->et = _find_enctype(etype);
|
|
if((*crypto)->et == NULL) {
|
|
free(*crypto);
|
|
return KRB5_PROG_ETYPE_NOSUPP;
|
|
}
|
|
ret = krb5_copy_keyblock(context, key, &(*crypto)->key.key);
|
|
if(ret) {
|
|
free(*crypto);
|
|
return ret;
|
|
}
|
|
(*crypto)->key.schedule = NULL;
|
|
(*crypto)->num_key_usage = 0;
|
|
(*crypto)->key_usage = NULL;
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
free_key_data(krb5_context context, struct key_data *key)
|
|
{
|
|
krb5_free_keyblock(context, key->key);
|
|
if(key->schedule) {
|
|
memset(key->schedule->data, 0, key->schedule->length);
|
|
krb5_free_data(context, key->schedule);
|
|
}
|
|
}
|
|
|
|
static void
|
|
free_key_usage(krb5_context context, struct key_usage *ku)
|
|
{
|
|
free_key_data(context, &ku->key);
|
|
}
|
|
|
|
krb5_error_code
|
|
krb5_crypto_destroy(krb5_context context,
|
|
krb5_crypto crypto)
|
|
{
|
|
int i;
|
|
|
|
for(i = 0; i < crypto->num_key_usage; i++)
|
|
free_key_usage(context, &crypto->key_usage[i]);
|
|
free(crypto->key_usage);
|
|
free_key_data(context, &crypto->key);
|
|
free (crypto);
|
|
return 0;
|
|
}
|
|
|
|
krb5_error_code
|
|
krb5_string_to_key_derived(krb5_context context,
|
|
const void *str,
|
|
size_t len,
|
|
krb5_enctype etype,
|
|
krb5_keyblock *key)
|
|
{
|
|
struct encryption_type *et = _find_enctype(etype);
|
|
krb5_error_code ret;
|
|
struct key_data kd;
|
|
u_char *tmp;
|
|
|
|
if(et == NULL)
|
|
return KRB5_PROG_ETYPE_NOSUPP;
|
|
ALLOC(kd.key, 1);
|
|
kd.key->keytype = etype;
|
|
tmp = malloc (et->keytype->bits / 8);
|
|
_krb5_n_fold(str, len, tmp, et->keytype->bits / 8);
|
|
krb5_data_alloc(&kd.key->keyvalue, et->keytype->size);
|
|
kd.schedule = NULL;
|
|
DES3_postproc (context, tmp, et->keytype->bits / 8, &kd); /* XXX */
|
|
ret = derive_key(context,
|
|
et,
|
|
&kd,
|
|
"kerberos", /* XXX well known constant */
|
|
strlen("kerberos"));
|
|
ret = krb5_copy_keyblock_contents(context, kd.key, key);
|
|
free_key_data(context, &kd);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Return the size of an encrypted packet of length `data_len'
|
|
*/
|
|
|
|
size_t
|
|
krb5_get_wrapped_length (krb5_context context,
|
|
krb5_crypto crypto,
|
|
size_t data_len)
|
|
{
|
|
struct encryption_type *et = crypto->et;
|
|
size_t blocksize = et->blocksize;
|
|
size_t res;
|
|
|
|
res = (data_len + blocksize - 1) / blocksize * blocksize;
|
|
res = res + et->confoundersize + et->cksumtype->checksumsize;
|
|
return res;
|
|
}
|
|
|
|
#ifdef CRYPTO_DEBUG
|
|
|
|
static krb5_error_code
|
|
krb5_get_keyid(krb5_context context,
|
|
krb5_keyblock *key,
|
|
u_int32_t *keyid)
|
|
{
|
|
MD5_CTX md5;
|
|
unsigned char tmp[16];
|
|
|
|
MD5Init (&md5);
|
|
MD5Update (&md5, key->keyvalue.data, key->keyvalue.length);
|
|
MD5Final (tmp, &md5);
|
|
*keyid = (tmp[12] << 24) | (tmp[13] << 16) | (tmp[14] << 8) | tmp[15];
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
krb5_crypto_debug(krb5_context context,
|
|
int encrypt,
|
|
size_t len,
|
|
krb5_keyblock *key)
|
|
{
|
|
u_int32_t keyid;
|
|
char *kt;
|
|
krb5_get_keyid(context, key, &keyid);
|
|
krb5_enctype_to_string(context, key->keytype, &kt);
|
|
krb5_warnx(context, "%s %lu bytes with key-id %#x (%s)",
|
|
encrypt ? "encrypting" : "decrypting",
|
|
(unsigned long)len,
|
|
keyid,
|
|
kt);
|
|
free(kt);
|
|
}
|
|
|
|
#endif /* CRYPTO_DEBUG */
|