5075 lines
121 KiB
C
5075 lines
121 KiB
C
/*
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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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#define KRB5_DEPRECATED
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#include "krb5_locl.h"
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#include <pkinit_asn1.h>
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#ifndef HEIMDAL_SMALLER
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#define DES3_OLD_ENCTYPE 1
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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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#define F_SPECIAL 32 /* backwards */
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#define F_DISABLED 64 /* enctype/checksum disabled */
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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_data, 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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void (*random_key)(krb5_context, krb5_keyblock*);
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void (*schedule)(krb5_context, struct key_type *, struct key_data *);
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struct salt_type *string_to_key;
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void (*random_to_key)(krb5_context, krb5_keyblock*, const void*, size_t);
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void (*cleanup)(krb5_context, struct key_data *);
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const EVP_CIPHER *(*evp)(void);
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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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krb5_enctype (*checksum)(krb5_context context,
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struct key_data *key,
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const void *buf, size_t len,
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unsigned usage,
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Checksum *csum);
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krb5_error_code (*verify)(krb5_context context,
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struct key_data *key,
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const void *buf, size_t len,
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unsigned usage,
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Checksum *csum);
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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 padsize;
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size_t confoundersize;
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struct key_type *keytype;
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struct checksum_type *checksum;
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struct checksum_type *keyed_checksum;
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unsigned flags;
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krb5_error_code (*encrypt)(krb5_context context,
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struct key_data *key,
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void *data, size_t len,
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krb5_boolean encryptp,
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int usage,
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void *ivec);
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size_t prf_length;
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krb5_error_code (*prf)(krb5_context,
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krb5_crypto, const krb5_data *, krb5_data *);
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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 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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static krb5_error_code derive_key(krb5_context context,
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struct encryption_type *et,
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struct key_data *key,
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const void *constant,
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size_t len);
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static krb5_error_code hmac(krb5_context context,
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struct checksum_type *cm,
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const void *data,
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size_t len,
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unsigned usage,
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struct key_data *keyblock,
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Checksum *result);
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static void free_key_data(krb5_context,
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struct key_data *,
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struct encryption_type *);
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static void free_key_schedule(krb5_context,
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struct key_data *,
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struct encryption_type *);
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static krb5_error_code usage2arcfour (krb5_context, unsigned *);
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static void xor (DES_cblock *, const unsigned char *);
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/************************************************************
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* *
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************************************************************/
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struct evp_schedule {
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EVP_CIPHER_CTX ectx;
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EVP_CIPHER_CTX dctx;
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};
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static HEIMDAL_MUTEX crypto_mutex = HEIMDAL_MUTEX_INITIALIZER;
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#ifdef HEIM_WEAK_CRYPTO
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static void
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krb5_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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krb5_DES_schedule_old(krb5_context context,
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struct key_type *kt,
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struct key_data *key)
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{
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DES_set_key_unchecked(key->key->keyvalue.data, key->schedule->data);
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}
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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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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) ?
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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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int 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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int 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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static void
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krb5_DES_random_to_key(krb5_context context,
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krb5_keyblock *key,
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const void *data,
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size_t size)
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{
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DES_cblock *k = key->keyvalue.data;
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memcpy(k, data, key->keyvalue.length);
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DES_set_odd_parity(k);
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if(DES_is_weak_key(k))
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xor(k, (const unsigned char*)"\0\0\0\0\0\0\0\xf0");
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}
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#endif
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/*
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*
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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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/*
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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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#ifdef DES3_OLD_ENCTYPE
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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_data opaque,
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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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krb5_error_code ret;
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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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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(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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ret = _krb5_n_fold(str, len, tmp, 24);
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if (ret) {
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memset(str, 0, len);
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free(str);
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krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
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return ret;
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}
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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, (const unsigned char*)"\0\0\0\0\0\0\0\xf0");
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DES_set_key_unchecked(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(tmp,
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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, (const 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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#endif
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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_data opaque,
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krb5_keyblock *key)
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|
{
|
|
krb5_error_code ret;
|
|
size_t len = password.length + salt.saltvalue.length;
|
|
char *s;
|
|
|
|
s = malloc(len);
|
|
if(len != 0 && s == NULL) {
|
|
krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
|
|
return ENOMEM;
|
|
}
|
|
memcpy(s, password.data, password.length);
|
|
memcpy(s + password.length, salt.saltvalue.data, salt.saltvalue.length);
|
|
ret = krb5_string_to_key_derived(context,
|
|
s,
|
|
len,
|
|
enctype,
|
|
key);
|
|
memset(s, 0, len);
|
|
free(s);
|
|
return ret;
|
|
}
|
|
|
|
static void
|
|
DES3_random_to_key(krb5_context context,
|
|
krb5_keyblock *key,
|
|
const void *data,
|
|
size_t size)
|
|
{
|
|
unsigned char *x = key->keyvalue.data;
|
|
const u_char *q = data;
|
|
DES_cblock *k;
|
|
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 = q[7 * i + j];
|
|
|
|
x[8 * i + j] = b;
|
|
}
|
|
foo = 0;
|
|
for (j = 6; j >= 0; --j) {
|
|
foo |= q[7 * i + j] & 1;
|
|
foo <<= 1;
|
|
}
|
|
x[8 * i + 7] = foo;
|
|
}
|
|
k = key->keyvalue.data;
|
|
for (i = 0; i < 3; i++) {
|
|
DES_set_odd_parity(&k[i]);
|
|
if(DES_is_weak_key(&k[i]))
|
|
xor(&k[i], (const unsigned char*)"\0\0\0\0\0\0\0\xf0");
|
|
}
|
|
}
|
|
|
|
/*
|
|
* ARCFOUR
|
|
*/
|
|
|
|
static krb5_error_code
|
|
ARCFOUR_string_to_key(krb5_context context,
|
|
krb5_enctype enctype,
|
|
krb5_data password,
|
|
krb5_salt salt,
|
|
krb5_data opaque,
|
|
krb5_keyblock *key)
|
|
{
|
|
krb5_error_code ret;
|
|
uint16_t *s = NULL;
|
|
size_t len, i;
|
|
EVP_MD_CTX *m;
|
|
|
|
m = EVP_MD_CTX_create();
|
|
if (m == NULL) {
|
|
ret = ENOMEM;
|
|
krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
|
|
goto out;
|
|
}
|
|
|
|
EVP_DigestInit_ex(m, EVP_md4(), NULL);
|
|
|
|
ret = wind_utf8ucs2_length(password.data, &len);
|
|
if (ret) {
|
|
krb5_set_error_message (context, ret,
|
|
N_("Password not an UCS2 string", ""));
|
|
goto out;
|
|
}
|
|
|
|
s = malloc (len * sizeof(s[0]));
|
|
if (len != 0 && s == NULL) {
|
|
krb5_set_error_message (context, ENOMEM,
|
|
N_("malloc: out of memory", ""));
|
|
ret = ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
ret = wind_utf8ucs2(password.data, s, &len);
|
|
if (ret) {
|
|
krb5_set_error_message (context, ret,
|
|
N_("Password not an UCS2 string", ""));
|
|
goto out;
|
|
}
|
|
|
|
/* LE encoding */
|
|
for (i = 0; i < len; i++) {
|
|
unsigned char p;
|
|
p = (s[i] & 0xff);
|
|
EVP_DigestUpdate (m, &p, 1);
|
|
p = (s[i] >> 8) & 0xff;
|
|
EVP_DigestUpdate (m, &p, 1);
|
|
}
|
|
|
|
key->keytype = enctype;
|
|
ret = krb5_data_alloc (&key->keyvalue, 16);
|
|
if (ret) {
|
|
krb5_set_error_message (context, ENOMEM, N_("malloc: out of memory", ""));
|
|
goto out;
|
|
}
|
|
EVP_DigestFinal_ex (m, key->keyvalue.data, NULL);
|
|
|
|
out:
|
|
EVP_MD_CTX_destroy(m);
|
|
if (s)
|
|
memset (s, 0, len);
|
|
free (s);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* AES
|
|
*/
|
|
|
|
int _krb5_AES_string_to_default_iterator = 4096;
|
|
|
|
static krb5_error_code
|
|
AES_string_to_key(krb5_context context,
|
|
krb5_enctype enctype,
|
|
krb5_data password,
|
|
krb5_salt salt,
|
|
krb5_data opaque,
|
|
krb5_keyblock *key)
|
|
{
|
|
krb5_error_code ret;
|
|
uint32_t iter;
|
|
struct encryption_type *et;
|
|
struct key_data kd;
|
|
|
|
if (opaque.length == 0)
|
|
iter = _krb5_AES_string_to_default_iterator;
|
|
else if (opaque.length == 4) {
|
|
unsigned long v;
|
|
_krb5_get_int(opaque.data, &v, 4);
|
|
iter = ((uint32_t)v);
|
|
} else
|
|
return KRB5_PROG_KEYTYPE_NOSUPP; /* XXX */
|
|
|
|
et = _find_enctype(enctype);
|
|
if (et == NULL)
|
|
return KRB5_PROG_KEYTYPE_NOSUPP;
|
|
|
|
kd.schedule = NULL;
|
|
ALLOC(kd.key, 1);
|
|
if(kd.key == NULL) {
|
|
krb5_set_error_message (context, ENOMEM, N_("malloc: out of memory", ""));
|
|
return ENOMEM;
|
|
}
|
|
kd.key->keytype = enctype;
|
|
ret = krb5_data_alloc(&kd.key->keyvalue, et->keytype->size);
|
|
if (ret) {
|
|
krb5_set_error_message (context, ret, N_("malloc: out of memory", ""));
|
|
return ret;
|
|
}
|
|
|
|
ret = PKCS5_PBKDF2_HMAC_SHA1(password.data, password.length,
|
|
salt.saltvalue.data, salt.saltvalue.length,
|
|
iter,
|
|
et->keytype->size, kd.key->keyvalue.data);
|
|
if (ret != 1) {
|
|
free_key_data(context, &kd, et);
|
|
krb5_set_error_message(context, KRB5_PROG_KEYTYPE_NOSUPP,
|
|
"Error calculating s2k");
|
|
return KRB5_PROG_KEYTYPE_NOSUPP;
|
|
}
|
|
|
|
ret = derive_key(context, et, &kd, "kerberos", strlen("kerberos"));
|
|
if (ret == 0)
|
|
ret = krb5_copy_keyblock_contents(context, kd.key, key);
|
|
free_key_data(context, &kd, et);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void
|
|
evp_schedule(krb5_context context, struct key_type *kt, struct key_data *kd)
|
|
{
|
|
struct evp_schedule *key = kd->schedule->data;
|
|
const EVP_CIPHER *c = (*kt->evp)();
|
|
|
|
EVP_CIPHER_CTX_init(&key->ectx);
|
|
EVP_CIPHER_CTX_init(&key->dctx);
|
|
|
|
EVP_CipherInit_ex(&key->ectx, c, NULL, kd->key->keyvalue.data, NULL, 1);
|
|
EVP_CipherInit_ex(&key->dctx, c, NULL, kd->key->keyvalue.data, NULL, 0);
|
|
}
|
|
|
|
static void
|
|
evp_cleanup(krb5_context context, struct key_data *kd)
|
|
{
|
|
struct evp_schedule *key = kd->schedule->data;
|
|
EVP_CIPHER_CTX_cleanup(&key->ectx);
|
|
EVP_CIPHER_CTX_cleanup(&key->dctx);
|
|
}
|
|
|
|
/*
|
|
*
|
|
*/
|
|
|
|
#ifdef HEIM_WEAK_CRYPTO
|
|
static struct salt_type des_salt[] = {
|
|
{
|
|
KRB5_PW_SALT,
|
|
"pw-salt",
|
|
krb5_DES_string_to_key
|
|
},
|
|
#ifdef ENABLE_AFS_STRING_TO_KEY
|
|
{
|
|
KRB5_AFS3_SALT,
|
|
"afs3-salt",
|
|
DES_AFS3_string_to_key
|
|
},
|
|
#endif
|
|
{ 0 }
|
|
};
|
|
#endif
|
|
|
|
#ifdef DES3_OLD_ENCTYPE
|
|
static struct salt_type des3_salt[] = {
|
|
{
|
|
KRB5_PW_SALT,
|
|
"pw-salt",
|
|
DES3_string_to_key
|
|
},
|
|
{ 0 }
|
|
};
|
|
#endif
|
|
|
|
static struct salt_type des3_salt_derived[] = {
|
|
{
|
|
KRB5_PW_SALT,
|
|
"pw-salt",
|
|
DES3_string_to_key_derived
|
|
},
|
|
{ 0 }
|
|
};
|
|
|
|
static struct salt_type AES_salt[] = {
|
|
{
|
|
KRB5_PW_SALT,
|
|
"pw-salt",
|
|
AES_string_to_key
|
|
},
|
|
{ 0 }
|
|
};
|
|
|
|
static struct salt_type arcfour_salt[] = {
|
|
{
|
|
KRB5_PW_SALT,
|
|
"pw-salt",
|
|
ARCFOUR_string_to_key
|
|
},
|
|
{ 0 }
|
|
};
|
|
|
|
/*
|
|
*
|
|
*/
|
|
|
|
static struct key_type keytype_null = {
|
|
KEYTYPE_NULL,
|
|
"null",
|
|
0,
|
|
0,
|
|
0,
|
|
NULL,
|
|
NULL,
|
|
NULL
|
|
};
|
|
|
|
#ifdef HEIM_WEAK_CRYPTO
|
|
static struct key_type keytype_des_old = {
|
|
KEYTYPE_DES,
|
|
"des-old",
|
|
56,
|
|
8,
|
|
sizeof(DES_key_schedule),
|
|
krb5_DES_random_key,
|
|
krb5_DES_schedule_old,
|
|
des_salt,
|
|
krb5_DES_random_to_key
|
|
};
|
|
|
|
static struct key_type keytype_des = {
|
|
KEYTYPE_DES,
|
|
"des",
|
|
56,
|
|
8,
|
|
sizeof(struct evp_schedule),
|
|
krb5_DES_random_key,
|
|
evp_schedule,
|
|
des_salt,
|
|
krb5_DES_random_to_key,
|
|
evp_cleanup,
|
|
EVP_des_cbc
|
|
};
|
|
#endif /* HEIM_WEAK_CRYPTO */
|
|
|
|
#ifdef DES3_OLD_ENCTYPE
|
|
static struct key_type keytype_des3 = {
|
|
KEYTYPE_DES3,
|
|
"des3",
|
|
168,
|
|
24,
|
|
sizeof(struct evp_schedule),
|
|
DES3_random_key,
|
|
evp_schedule,
|
|
des3_salt,
|
|
DES3_random_to_key,
|
|
evp_cleanup,
|
|
EVP_des_ede3_cbc
|
|
};
|
|
#endif
|
|
|
|
static struct key_type keytype_des3_derived = {
|
|
KEYTYPE_DES3,
|
|
"des3",
|
|
168,
|
|
24,
|
|
sizeof(struct evp_schedule),
|
|
DES3_random_key,
|
|
evp_schedule,
|
|
des3_salt_derived,
|
|
DES3_random_to_key,
|
|
evp_cleanup,
|
|
EVP_des_ede3_cbc
|
|
};
|
|
|
|
static struct key_type keytype_aes128 = {
|
|
KEYTYPE_AES128,
|
|
"aes-128",
|
|
128,
|
|
16,
|
|
sizeof(struct evp_schedule),
|
|
NULL,
|
|
evp_schedule,
|
|
AES_salt,
|
|
NULL,
|
|
evp_cleanup,
|
|
EVP_aes_128_cbc
|
|
};
|
|
|
|
static struct key_type keytype_aes256 = {
|
|
KEYTYPE_AES256,
|
|
"aes-256",
|
|
256,
|
|
32,
|
|
sizeof(struct evp_schedule),
|
|
NULL,
|
|
evp_schedule,
|
|
AES_salt,
|
|
NULL,
|
|
evp_cleanup,
|
|
EVP_aes_256_cbc
|
|
};
|
|
|
|
static struct key_type keytype_arcfour = {
|
|
KEYTYPE_ARCFOUR,
|
|
"arcfour",
|
|
128,
|
|
16,
|
|
sizeof(struct evp_schedule),
|
|
NULL,
|
|
evp_schedule,
|
|
arcfour_salt,
|
|
NULL,
|
|
evp_cleanup,
|
|
EVP_rc4
|
|
};
|
|
|
|
krb5_error_code KRB5_LIB_FUNCTION
|
|
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) {
|
|
krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
|
|
"encryption type %d not supported",
|
|
etype);
|
|
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) {
|
|
krb5_set_error_message (context, ENOMEM,
|
|
N_("malloc: out of memory", ""));
|
|
return ENOMEM;
|
|
}
|
|
return 0;
|
|
}
|
|
}
|
|
krb5_set_error_message (context, HEIM_ERR_SALTTYPE_NOSUPP,
|
|
"salttype %d not supported", stype);
|
|
return HEIM_ERR_SALTTYPE_NOSUPP;
|
|
}
|
|
|
|
krb5_error_code KRB5_LIB_FUNCTION
|
|
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) {
|
|
krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
|
|
N_("encryption type %d not supported", ""),
|
|
etype);
|
|
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;
|
|
}
|
|
}
|
|
krb5_set_error_message(context, HEIM_ERR_SALTTYPE_NOSUPP,
|
|
N_("salttype %s not supported", ""), string);
|
|
return HEIM_ERR_SALTTYPE_NOSUPP;
|
|
}
|
|
|
|
krb5_error_code KRB5_LIB_FUNCTION
|
|
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_LIB_FUNCTION
|
|
krb5_free_salt(krb5_context context,
|
|
krb5_salt salt)
|
|
{
|
|
krb5_data_free(&salt.saltvalue);
|
|
return 0;
|
|
}
|
|
|
|
krb5_error_code KRB5_LIB_FUNCTION
|
|
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_LIB_FUNCTION
|
|
krb5_string_to_key (krb5_context context,
|
|
krb5_enctype enctype,
|
|
const char *password,
|
|
krb5_principal principal,
|
|
krb5_keyblock *key)
|
|
{
|
|
krb5_data pw;
|
|
pw.data = rk_UNCONST(password);
|
|
pw.length = strlen(password);
|
|
return krb5_string_to_key_data(context, enctype, pw, principal, key);
|
|
}
|
|
|
|
krb5_error_code KRB5_LIB_FUNCTION
|
|
krb5_string_to_key_data_salt (krb5_context context,
|
|
krb5_enctype enctype,
|
|
krb5_data password,
|
|
krb5_salt salt,
|
|
krb5_keyblock *key)
|
|
{
|
|
krb5_data opaque;
|
|
krb5_data_zero(&opaque);
|
|
return krb5_string_to_key_data_salt_opaque(context, enctype, password,
|
|
salt, opaque, key);
|
|
}
|
|
|
|
/*
|
|
* Do a string -> key for encryption type `enctype' operation on
|
|
* `password' (with salt `salt' and the enctype specific data string
|
|
* `opaque'), returning the resulting key in `key'
|
|
*/
|
|
|
|
krb5_error_code KRB5_LIB_FUNCTION
|
|
krb5_string_to_key_data_salt_opaque (krb5_context context,
|
|
krb5_enctype enctype,
|
|
krb5_data password,
|
|
krb5_salt salt,
|
|
krb5_data opaque,
|
|
krb5_keyblock *key)
|
|
{
|
|
struct encryption_type *et =_find_enctype(enctype);
|
|
struct salt_type *st;
|
|
if(et == NULL) {
|
|
krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
|
|
N_("encryption type %d not supported", ""),
|
|
enctype);
|
|
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, opaque, key);
|
|
krb5_set_error_message(context, HEIM_ERR_SALTTYPE_NOSUPP,
|
|
N_("salt type %d not supported", ""),
|
|
salt.salttype);
|
|
return HEIM_ERR_SALTTYPE_NOSUPP;
|
|
}
|
|
|
|
/*
|
|
* Do a string -> key for encryption type `enctype' operation on the
|
|
* string `password' (with salt `salt'), returning the resulting key
|
|
* in `key'
|
|
*/
|
|
|
|
krb5_error_code KRB5_LIB_FUNCTION
|
|
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 = rk_UNCONST(password);
|
|
pw.length = strlen(password);
|
|
return krb5_string_to_key_data_salt(context, enctype, pw, salt, key);
|
|
}
|
|
|
|
krb5_error_code KRB5_LIB_FUNCTION
|
|
krb5_string_to_key_salt_opaque (krb5_context context,
|
|
krb5_enctype enctype,
|
|
const char *password,
|
|
krb5_salt salt,
|
|
krb5_data opaque,
|
|
krb5_keyblock *key)
|
|
{
|
|
krb5_data pw;
|
|
pw.data = rk_UNCONST(password);
|
|
pw.length = strlen(password);
|
|
return krb5_string_to_key_data_salt_opaque(context, enctype,
|
|
pw, salt, opaque, key);
|
|
}
|
|
|
|
krb5_error_code KRB5_LIB_FUNCTION
|
|
krb5_enctype_keysize(krb5_context context,
|
|
krb5_enctype type,
|
|
size_t *keysize)
|
|
{
|
|
struct encryption_type *et = _find_enctype(type);
|
|
if(et == NULL) {
|
|
krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
|
|
N_("encryption type %d not supported", ""),
|
|
type);
|
|
return KRB5_PROG_ETYPE_NOSUPP;
|
|
}
|
|
*keysize = et->keytype->size;
|
|
return 0;
|
|
}
|
|
|
|
krb5_error_code KRB5_LIB_FUNCTION
|
|
krb5_enctype_keybits(krb5_context context,
|
|
krb5_enctype type,
|
|
size_t *keybits)
|
|
{
|
|
struct encryption_type *et = _find_enctype(type);
|
|
if(et == NULL) {
|
|
krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
|
|
"encryption type %d not supported",
|
|
type);
|
|
return KRB5_PROG_ETYPE_NOSUPP;
|
|
}
|
|
*keybits = et->keytype->bits;
|
|
return 0;
|
|
}
|
|
|
|
krb5_error_code KRB5_LIB_FUNCTION
|
|
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) {
|
|
krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
|
|
N_("encryption type %d not supported", ""),
|
|
type);
|
|
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;
|
|
|
|
if (et == NULL) {
|
|
krb5_set_error_message (context, KRB5_PROG_ETYPE_NOSUPP,
|
|
N_("encryption type %d not supported", ""),
|
|
key->key->keytype);
|
|
return KRB5_PROG_ETYPE_NOSUPP;
|
|
}
|
|
|
|
kt = et->keytype;
|
|
|
|
if(kt->schedule == NULL)
|
|
return 0;
|
|
if (key->schedule != NULL)
|
|
return 0;
|
|
ALLOC(key->schedule, 1);
|
|
if(key->schedule == NULL) {
|
|
krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
|
|
return ENOMEM;
|
|
}
|
|
ret = krb5_data_alloc(key->schedule, kt->schedule_size);
|
|
if(ret) {
|
|
free(key->schedule);
|
|
key->schedule = NULL;
|
|
return ret;
|
|
}
|
|
(*kt->schedule)(context, kt, key);
|
|
return 0;
|
|
}
|
|
|
|
/************************************************************
|
|
* *
|
|
************************************************************/
|
|
|
|
static krb5_error_code
|
|
NONE_checksum(krb5_context context,
|
|
struct key_data *key,
|
|
const void *data,
|
|
size_t len,
|
|
unsigned usage,
|
|
Checksum *C)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
#if defined(DES3_OLD_ENCTYPE) || defined(HEIM_WEAK_CRYPTO)
|
|
|
|
static krb5_error_code
|
|
des_checksum(krb5_context context,
|
|
const EVP_MD *evp_md,
|
|
struct key_data *key,
|
|
const void *data,
|
|
size_t len,
|
|
Checksum *cksum)
|
|
{
|
|
struct evp_schedule *ctx = key->schedule->data;
|
|
EVP_MD_CTX *m;
|
|
DES_cblock ivec;
|
|
unsigned char *p = cksum->checksum.data;
|
|
|
|
krb5_generate_random_block(p, 8);
|
|
|
|
m = EVP_MD_CTX_create();
|
|
if (m == NULL) {
|
|
krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
|
|
return ENOMEM;
|
|
}
|
|
|
|
EVP_DigestInit_ex(m, evp_md, NULL);
|
|
EVP_DigestUpdate(m, p, 8);
|
|
EVP_DigestUpdate(m, data, len);
|
|
EVP_DigestFinal_ex (m, p + 8, NULL);
|
|
EVP_MD_CTX_destroy(m);
|
|
memset (&ivec, 0, sizeof(ivec));
|
|
EVP_CipherInit_ex(&ctx->ectx, NULL, NULL, NULL, (void *)&ivec, -1);
|
|
EVP_Cipher(&ctx->ectx, p, p, 24);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static krb5_error_code
|
|
des_verify(krb5_context context,
|
|
const EVP_MD *evp_md,
|
|
struct key_data *key,
|
|
const void *data,
|
|
size_t len,
|
|
Checksum *C)
|
|
{
|
|
struct evp_schedule *ctx = key->schedule->data;
|
|
EVP_MD_CTX *m;
|
|
unsigned char tmp[24];
|
|
unsigned char res[16];
|
|
DES_cblock ivec;
|
|
krb5_error_code ret = 0;
|
|
|
|
m = EVP_MD_CTX_create();
|
|
if (m == NULL) {
|
|
krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
|
|
return ENOMEM;
|
|
}
|
|
|
|
memset(&ivec, 0, sizeof(ivec));
|
|
EVP_CipherInit_ex(&ctx->dctx, NULL, NULL, NULL, (void *)&ivec, -1);
|
|
EVP_Cipher(&ctx->dctx, tmp, C->checksum.data, 24);
|
|
|
|
EVP_DigestInit_ex(m, evp_md, NULL);
|
|
EVP_DigestUpdate(m, tmp, 8); /* confounder */
|
|
EVP_DigestUpdate(m, data, len);
|
|
EVP_DigestFinal_ex (m, res, NULL);
|
|
EVP_MD_CTX_destroy(m);
|
|
if(ct_memcmp(res, tmp + 8, sizeof(res)) != 0) {
|
|
krb5_clear_error_message (context);
|
|
ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
|
|
}
|
|
memset(tmp, 0, sizeof(tmp));
|
|
memset(res, 0, sizeof(res));
|
|
return ret;
|
|
}
|
|
|
|
#endif
|
|
|
|
#ifdef HEIM_WEAK_CRYPTO
|
|
|
|
static krb5_error_code
|
|
CRC32_checksum(krb5_context context,
|
|
struct key_data *key,
|
|
const void *data,
|
|
size_t len,
|
|
unsigned usage,
|
|
Checksum *C)
|
|
{
|
|
uint32_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;
|
|
return 0;
|
|
}
|
|
|
|
static krb5_error_code
|
|
RSA_MD4_checksum(krb5_context context,
|
|
struct key_data *key,
|
|
const void *data,
|
|
size_t len,
|
|
unsigned usage,
|
|
Checksum *C)
|
|
{
|
|
if (EVP_Digest(data, len, C->checksum.data, NULL, EVP_md4(), NULL) != 1)
|
|
krb5_abortx(context, "md4 checksum failed");
|
|
return 0;
|
|
}
|
|
|
|
static krb5_error_code
|
|
RSA_MD4_DES_checksum(krb5_context context,
|
|
struct key_data *key,
|
|
const void *data,
|
|
size_t len,
|
|
unsigned usage,
|
|
Checksum *cksum)
|
|
{
|
|
return des_checksum(context, EVP_md4(), key, data, len, cksum);
|
|
}
|
|
|
|
static krb5_error_code
|
|
RSA_MD4_DES_verify(krb5_context context,
|
|
struct key_data *key,
|
|
const void *data,
|
|
size_t len,
|
|
unsigned usage,
|
|
Checksum *C)
|
|
{
|
|
return des_verify(context, EVP_md5(), key, data, len, C);
|
|
}
|
|
|
|
static krb5_error_code
|
|
RSA_MD5_DES_checksum(krb5_context context,
|
|
struct key_data *key,
|
|
const void *data,
|
|
size_t len,
|
|
unsigned usage,
|
|
Checksum *C)
|
|
{
|
|
return des_checksum(context, EVP_md5(), key, data, len, C);
|
|
}
|
|
|
|
static krb5_error_code
|
|
RSA_MD5_DES_verify(krb5_context context,
|
|
struct key_data *key,
|
|
const void *data,
|
|
size_t len,
|
|
unsigned usage,
|
|
Checksum *C)
|
|
{
|
|
return des_verify(context, EVP_md5(), key, data, len, C);
|
|
}
|
|
|
|
#endif /* HEIM_WEAK_CRYPTO */
|
|
|
|
#ifdef DES3_OLD_ENCTYPE
|
|
static krb5_error_code
|
|
RSA_MD5_DES3_checksum(krb5_context context,
|
|
struct key_data *key,
|
|
const void *data,
|
|
size_t len,
|
|
unsigned usage,
|
|
Checksum *C)
|
|
{
|
|
return des_checksum(context, EVP_md5(), key, data, len, C);
|
|
}
|
|
|
|
static krb5_error_code
|
|
RSA_MD5_DES3_verify(krb5_context context,
|
|
struct key_data *key,
|
|
const void *data,
|
|
size_t len,
|
|
unsigned usage,
|
|
Checksum *C)
|
|
{
|
|
return des_verify(context, EVP_md5(), key, data, len, C);
|
|
}
|
|
#endif
|
|
|
|
static krb5_error_code
|
|
SHA1_checksum(krb5_context context,
|
|
struct key_data *key,
|
|
const void *data,
|
|
size_t len,
|
|
unsigned usage,
|
|
Checksum *C)
|
|
{
|
|
if (EVP_Digest(data, len, C->checksum.data, NULL, EVP_sha1(), NULL) != 1)
|
|
krb5_abortx(context, "sha1 checksum failed");
|
|
return 0;
|
|
}
|
|
|
|
/* HMAC according to RFC2104 */
|
|
static krb5_error_code
|
|
hmac(krb5_context context,
|
|
struct checksum_type *cm,
|
|
const void *data,
|
|
size_t len,
|
|
unsigned usage,
|
|
struct key_data *keyblock,
|
|
Checksum *result)
|
|
{
|
|
unsigned char *ipad, *opad;
|
|
unsigned char *key;
|
|
size_t key_len;
|
|
int i;
|
|
|
|
ipad = malloc(cm->blocksize + len);
|
|
if (ipad == NULL)
|
|
return ENOMEM;
|
|
opad = malloc(cm->blocksize + cm->checksumsize);
|
|
if (opad == NULL) {
|
|
free(ipad);
|
|
return ENOMEM;
|
|
}
|
|
memset(ipad, 0x36, cm->blocksize);
|
|
memset(opad, 0x5c, cm->blocksize);
|
|
|
|
if(keyblock->key->keyvalue.length > cm->blocksize){
|
|
(*cm->checksum)(context,
|
|
keyblock,
|
|
keyblock->key->keyvalue.data,
|
|
keyblock->key->keyvalue.length,
|
|
usage,
|
|
result);
|
|
key = result->checksum.data;
|
|
key_len = result->checksum.length;
|
|
} else {
|
|
key = keyblock->key->keyvalue.data;
|
|
key_len = keyblock->key->keyvalue.length;
|
|
}
|
|
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,
|
|
usage, result);
|
|
memcpy(opad + cm->blocksize, result->checksum.data,
|
|
result->checksum.length);
|
|
(*cm->checksum)(context, keyblock, opad,
|
|
cm->blocksize + cm->checksumsize, usage, result);
|
|
memset(ipad, 0, cm->blocksize + len);
|
|
free(ipad);
|
|
memset(opad, 0, cm->blocksize + cm->checksumsize);
|
|
free(opad);
|
|
|
|
return 0;
|
|
}
|
|
|
|
krb5_error_code KRB5_LIB_FUNCTION
|
|
krb5_hmac(krb5_context context,
|
|
krb5_cksumtype cktype,
|
|
const void *data,
|
|
size_t len,
|
|
unsigned usage,
|
|
krb5_keyblock *key,
|
|
Checksum *result)
|
|
{
|
|
struct checksum_type *c = _find_checksum(cktype);
|
|
struct key_data kd;
|
|
krb5_error_code ret;
|
|
|
|
if (c == NULL) {
|
|
krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
|
|
N_("checksum type %d not supported", ""),
|
|
cktype);
|
|
return KRB5_PROG_SUMTYPE_NOSUPP;
|
|
}
|
|
|
|
kd.key = key;
|
|
kd.schedule = NULL;
|
|
|
|
ret = hmac(context, c, data, len, usage, &kd, result);
|
|
|
|
if (kd.schedule)
|
|
krb5_free_data(context, kd.schedule);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static krb5_error_code
|
|
SP_HMAC_SHA1_checksum(krb5_context context,
|
|
struct key_data *key,
|
|
const void *data,
|
|
size_t len,
|
|
unsigned usage,
|
|
Checksum *result)
|
|
{
|
|
struct checksum_type *c = _find_checksum(CKSUMTYPE_SHA1);
|
|
Checksum res;
|
|
char sha1_data[20];
|
|
krb5_error_code ret;
|
|
|
|
res.checksum.data = sha1_data;
|
|
res.checksum.length = sizeof(sha1_data);
|
|
|
|
ret = hmac(context, c, data, len, usage, key, &res);
|
|
if (ret)
|
|
krb5_abortx(context, "hmac failed");
|
|
memcpy(result->checksum.data, res.checksum.data, result->checksum.length);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* checksum according to section 5. of draft-brezak-win2k-krb-rc4-hmac-03.txt
|
|
*/
|
|
|
|
static krb5_error_code
|
|
HMAC_MD5_checksum(krb5_context context,
|
|
struct key_data *key,
|
|
const void *data,
|
|
size_t len,
|
|
unsigned usage,
|
|
Checksum *result)
|
|
{
|
|
EVP_MD_CTX *m;
|
|
struct checksum_type *c = _find_checksum (CKSUMTYPE_RSA_MD5);
|
|
const char signature[] = "signaturekey";
|
|
Checksum ksign_c;
|
|
struct key_data ksign;
|
|
krb5_keyblock kb;
|
|
unsigned char t[4];
|
|
unsigned char tmp[16];
|
|
unsigned char ksign_c_data[16];
|
|
krb5_error_code ret;
|
|
|
|
m = EVP_MD_CTX_create();
|
|
if (m == NULL) {
|
|
krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
|
|
return ENOMEM;
|
|
}
|
|
ksign_c.checksum.length = sizeof(ksign_c_data);
|
|
ksign_c.checksum.data = ksign_c_data;
|
|
ret = hmac(context, c, signature, sizeof(signature), 0, key, &ksign_c);
|
|
if (ret) {
|
|
EVP_MD_CTX_destroy(m);
|
|
return ret;
|
|
}
|
|
ksign.key = &kb;
|
|
kb.keyvalue = ksign_c.checksum;
|
|
EVP_DigestInit_ex(m, EVP_md5(), NULL);
|
|
t[0] = (usage >> 0) & 0xFF;
|
|
t[1] = (usage >> 8) & 0xFF;
|
|
t[2] = (usage >> 16) & 0xFF;
|
|
t[3] = (usage >> 24) & 0xFF;
|
|
EVP_DigestUpdate(m, t, 4);
|
|
EVP_DigestUpdate(m, data, len);
|
|
EVP_DigestFinal_ex (m, tmp, NULL);
|
|
EVP_MD_CTX_destroy(m);
|
|
|
|
ret = hmac(context, c, tmp, sizeof(tmp), 0, &ksign, result);
|
|
if (ret)
|
|
return ret;
|
|
return 0;
|
|
}
|
|
|
|
static struct checksum_type checksum_none = {
|
|
CKSUMTYPE_NONE,
|
|
"none",
|
|
1,
|
|
0,
|
|
0,
|
|
NONE_checksum,
|
|
NULL
|
|
};
|
|
#ifdef HEIM_WEAK_CRYPTO
|
|
static struct checksum_type checksum_crc32 = {
|
|
CKSUMTYPE_CRC32,
|
|
"crc32",
|
|
1,
|
|
4,
|
|
0,
|
|
CRC32_checksum,
|
|
NULL
|
|
};
|
|
static struct checksum_type checksum_rsa_md4 = {
|
|
CKSUMTYPE_RSA_MD4,
|
|
"rsa-md4",
|
|
64,
|
|
16,
|
|
F_CPROOF,
|
|
RSA_MD4_checksum,
|
|
NULL
|
|
};
|
|
static 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
|
|
};
|
|
static 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
|
|
};
|
|
#endif /* HEIM_WEAK_CRYPTO */
|
|
|
|
static krb5_error_code
|
|
RSA_MD5_checksum(krb5_context context,
|
|
struct key_data *key,
|
|
const void *data,
|
|
size_t len,
|
|
unsigned usage,
|
|
Checksum *C)
|
|
{
|
|
if (EVP_Digest(data, len, C->checksum.data, NULL, EVP_md5(), NULL) != 1)
|
|
krb5_abortx(context, "md5 checksum failed");
|
|
return 0;
|
|
}
|
|
|
|
static struct checksum_type checksum_rsa_md5 = {
|
|
CKSUMTYPE_RSA_MD5,
|
|
"rsa-md5",
|
|
64,
|
|
16,
|
|
F_CPROOF,
|
|
RSA_MD5_checksum,
|
|
NULL
|
|
};
|
|
|
|
#ifdef DES3_OLD_ENCTYPE
|
|
static 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
|
|
};
|
|
#endif
|
|
static struct checksum_type checksum_sha1 = {
|
|
CKSUMTYPE_SHA1,
|
|
"sha1",
|
|
64,
|
|
20,
|
|
F_CPROOF,
|
|
SHA1_checksum,
|
|
NULL
|
|
};
|
|
static struct checksum_type checksum_hmac_sha1_des3 = {
|
|
CKSUMTYPE_HMAC_SHA1_DES3,
|
|
"hmac-sha1-des3",
|
|
64,
|
|
20,
|
|
F_KEYED | F_CPROOF | F_DERIVED,
|
|
SP_HMAC_SHA1_checksum,
|
|
NULL
|
|
};
|
|
|
|
static struct checksum_type checksum_hmac_sha1_aes128 = {
|
|
CKSUMTYPE_HMAC_SHA1_96_AES_128,
|
|
"hmac-sha1-96-aes128",
|
|
64,
|
|
12,
|
|
F_KEYED | F_CPROOF | F_DERIVED,
|
|
SP_HMAC_SHA1_checksum,
|
|
NULL
|
|
};
|
|
|
|
static struct checksum_type checksum_hmac_sha1_aes256 = {
|
|
CKSUMTYPE_HMAC_SHA1_96_AES_256,
|
|
"hmac-sha1-96-aes256",
|
|
64,
|
|
12,
|
|
F_KEYED | F_CPROOF | F_DERIVED,
|
|
SP_HMAC_SHA1_checksum,
|
|
NULL
|
|
};
|
|
|
|
static struct checksum_type checksum_hmac_md5 = {
|
|
CKSUMTYPE_HMAC_MD5,
|
|
"hmac-md5",
|
|
64,
|
|
16,
|
|
F_KEYED | F_CPROOF,
|
|
HMAC_MD5_checksum,
|
|
NULL
|
|
};
|
|
|
|
static struct checksum_type *checksum_types[] = {
|
|
&checksum_none,
|
|
#ifdef HEIM_WEAK_CRYPTO
|
|
&checksum_crc32,
|
|
&checksum_rsa_md4,
|
|
&checksum_rsa_md4_des,
|
|
&checksum_rsa_md5_des,
|
|
#endif
|
|
#ifdef DES3_OLD_ENCTYPE
|
|
&checksum_rsa_md5_des3,
|
|
#endif
|
|
&checksum_rsa_md5,
|
|
&checksum_sha1,
|
|
&checksum_hmac_sha1_des3,
|
|
&checksum_hmac_sha1_aes128,
|
|
&checksum_hmac_sha1_aes256,
|
|
&checksum_hmac_md5
|
|
};
|
|
|
|
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) {
|
|
krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
|
|
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
|
|
create_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;
|
|
|
|
if (ct->flags & F_DISABLED) {
|
|
krb5_clear_error_message (context);
|
|
return KRB5_PROG_SUMTYPE_NOSUPP;
|
|
}
|
|
keyed_checksum = (ct->flags & F_KEYED) != 0;
|
|
if(keyed_checksum && crypto == NULL) {
|
|
krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
|
|
N_("Checksum type %s is keyed but no "
|
|
"crypto context (key) was passed in", ""),
|
|
ct->name);
|
|
return KRB5_PROG_SUMTYPE_NOSUPP; /* XXX */
|
|
}
|
|
if(keyed_checksum) {
|
|
ret = get_checksum_key(context, crypto, usage, ct, &dkey);
|
|
if (ret)
|
|
return ret;
|
|
} else
|
|
dkey = NULL;
|
|
result->cksumtype = ct->type;
|
|
ret = krb5_data_alloc(&result->checksum, ct->checksumsize);
|
|
if (ret)
|
|
return (ret);
|
|
return (*ct->checksum)(context, dkey, data, len, usage, result);
|
|
}
|
|
|
|
static int
|
|
arcfour_checksum_p(struct checksum_type *ct, krb5_crypto crypto)
|
|
{
|
|
return (ct->type == CKSUMTYPE_HMAC_MD5) &&
|
|
(crypto->key.key->keytype == KEYTYPE_ARCFOUR);
|
|
}
|
|
|
|
krb5_error_code KRB5_LIB_FUNCTION
|
|
krb5_create_checksum(krb5_context context,
|
|
krb5_crypto crypto,
|
|
krb5_key_usage usage,
|
|
int type,
|
|
void *data,
|
|
size_t len,
|
|
Checksum *result)
|
|
{
|
|
struct checksum_type *ct = NULL;
|
|
unsigned keyusage;
|
|
|
|
/* type 0 -> pick from crypto */
|
|
if (type) {
|
|
ct = _find_checksum(type);
|
|
} else if (crypto) {
|
|
ct = crypto->et->keyed_checksum;
|
|
if (ct == NULL)
|
|
ct = crypto->et->checksum;
|
|
}
|
|
|
|
if(ct == NULL) {
|
|
krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
|
|
N_("checksum type %d not supported", ""),
|
|
type);
|
|
return KRB5_PROG_SUMTYPE_NOSUPP;
|
|
}
|
|
|
|
if (arcfour_checksum_p(ct, crypto)) {
|
|
keyusage = usage;
|
|
usage2arcfour(context, &keyusage);
|
|
} else
|
|
keyusage = CHECKSUM_USAGE(usage);
|
|
|
|
return create_checksum(context, ct, crypto, keyusage,
|
|
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 || (ct->flags & F_DISABLED)) {
|
|
krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
|
|
N_("checksum type %d not supported", ""),
|
|
cksum->cksumtype);
|
|
return KRB5_PROG_SUMTYPE_NOSUPP;
|
|
}
|
|
if(ct->checksumsize != cksum->checksum.length) {
|
|
krb5_clear_error_message (context);
|
|
return KRB5KRB_AP_ERR_BAD_INTEGRITY; /* XXX */
|
|
}
|
|
keyed_checksum = (ct->flags & F_KEYED) != 0;
|
|
if(keyed_checksum) {
|
|
struct checksum_type *kct;
|
|
if (crypto == NULL) {
|
|
krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
|
|
N_("Checksum type %s is keyed but no "
|
|
"crypto context (key) was passed in", ""),
|
|
ct->name);
|
|
return KRB5_PROG_SUMTYPE_NOSUPP; /* XXX */
|
|
}
|
|
kct = crypto->et->keyed_checksum;
|
|
if (kct != NULL && kct->type != ct->type) {
|
|
krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
|
|
N_("Checksum type %s is keyed, but "
|
|
"the key type %s passed didnt have that checksum "
|
|
"type as the keyed type", ""),
|
|
ct->name, crypto->et->name);
|
|
return KRB5_PROG_SUMTYPE_NOSUPP; /* XXX */
|
|
}
|
|
|
|
ret = get_checksum_key(context, crypto, usage, ct, &dkey);
|
|
if (ret)
|
|
return ret;
|
|
} else
|
|
dkey = NULL;
|
|
if(ct->verify)
|
|
return (*ct->verify)(context, dkey, data, len, usage, cksum);
|
|
|
|
ret = krb5_data_alloc (&c.checksum, ct->checksumsize);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = (*ct->checksum)(context, dkey, data, len, usage, &c);
|
|
if (ret) {
|
|
krb5_data_free(&c.checksum);
|
|
return ret;
|
|
}
|
|
|
|
if(c.checksum.length != cksum->checksum.length ||
|
|
ct_memcmp(c.checksum.data, cksum->checksum.data, c.checksum.length)) {
|
|
krb5_clear_error_message (context);
|
|
ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
|
|
} else {
|
|
ret = 0;
|
|
}
|
|
krb5_data_free (&c.checksum);
|
|
return ret;
|
|
}
|
|
|
|
krb5_error_code KRB5_LIB_FUNCTION
|
|
krb5_verify_checksum(krb5_context context,
|
|
krb5_crypto crypto,
|
|
krb5_key_usage usage,
|
|
void *data,
|
|
size_t len,
|
|
Checksum *cksum)
|
|
{
|
|
struct checksum_type *ct;
|
|
unsigned keyusage;
|
|
|
|
ct = _find_checksum(cksum->cksumtype);
|
|
if(ct == NULL) {
|
|
krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
|
|
N_("checksum type %d not supported", ""),
|
|
cksum->cksumtype);
|
|
return KRB5_PROG_SUMTYPE_NOSUPP;
|
|
}
|
|
|
|
if (arcfour_checksum_p(ct, crypto)) {
|
|
keyusage = usage;
|
|
usage2arcfour(context, &keyusage);
|
|
} else
|
|
keyusage = CHECKSUM_USAGE(usage);
|
|
|
|
return verify_checksum(context, crypto, keyusage,
|
|
data, len, cksum);
|
|
}
|
|
|
|
krb5_error_code KRB5_LIB_FUNCTION
|
|
krb5_crypto_get_checksum_type(krb5_context context,
|
|
krb5_crypto crypto,
|
|
krb5_cksumtype *type)
|
|
{
|
|
struct checksum_type *ct = NULL;
|
|
|
|
if (crypto != NULL) {
|
|
ct = crypto->et->keyed_checksum;
|
|
if (ct == NULL)
|
|
ct = crypto->et->checksum;
|
|
}
|
|
|
|
if (ct == NULL) {
|
|
krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
|
|
N_("checksum type not found", ""));
|
|
return KRB5_PROG_SUMTYPE_NOSUPP;
|
|
}
|
|
|
|
*type = ct->type;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
krb5_error_code KRB5_LIB_FUNCTION
|
|
krb5_checksumsize(krb5_context context,
|
|
krb5_cksumtype type,
|
|
size_t *size)
|
|
{
|
|
struct checksum_type *ct = _find_checksum(type);
|
|
if(ct == NULL) {
|
|
krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
|
|
N_("checksum type %d not supported", ""),
|
|
type);
|
|
return KRB5_PROG_SUMTYPE_NOSUPP;
|
|
}
|
|
*size = ct->checksumsize;
|
|
return 0;
|
|
}
|
|
|
|
krb5_boolean KRB5_LIB_FUNCTION
|
|
krb5_checksum_is_keyed(krb5_context context,
|
|
krb5_cksumtype type)
|
|
{
|
|
struct checksum_type *ct = _find_checksum(type);
|
|
if(ct == NULL) {
|
|
if (context)
|
|
krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
|
|
N_("checksum type %d not supported", ""),
|
|
type);
|
|
return KRB5_PROG_SUMTYPE_NOSUPP;
|
|
}
|
|
return ct->flags & F_KEYED;
|
|
}
|
|
|
|
krb5_boolean KRB5_LIB_FUNCTION
|
|
krb5_checksum_is_collision_proof(krb5_context context,
|
|
krb5_cksumtype type)
|
|
{
|
|
struct checksum_type *ct = _find_checksum(type);
|
|
if(ct == NULL) {
|
|
if (context)
|
|
krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
|
|
N_("checksum type %d not supported", ""),
|
|
type);
|
|
return KRB5_PROG_SUMTYPE_NOSUPP;
|
|
}
|
|
return ct->flags & F_CPROOF;
|
|
}
|
|
|
|
krb5_error_code KRB5_LIB_FUNCTION
|
|
krb5_checksum_disable(krb5_context context,
|
|
krb5_cksumtype type)
|
|
{
|
|
struct checksum_type *ct = _find_checksum(type);
|
|
if(ct == NULL) {
|
|
if (context)
|
|
krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
|
|
N_("checksum type %d not supported", ""),
|
|
type);
|
|
return KRB5_PROG_SUMTYPE_NOSUPP;
|
|
}
|
|
ct->flags |= F_DISABLED;
|
|
return 0;
|
|
}
|
|
|
|
/************************************************************
|
|
* *
|
|
************************************************************/
|
|
|
|
static krb5_error_code
|
|
NULL_encrypt(krb5_context context,
|
|
struct key_data *key,
|
|
void *data,
|
|
size_t len,
|
|
krb5_boolean encryptp,
|
|
int usage,
|
|
void *ivec)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static krb5_error_code
|
|
evp_encrypt(krb5_context context,
|
|
struct key_data *key,
|
|
void *data,
|
|
size_t len,
|
|
krb5_boolean encryptp,
|
|
int usage,
|
|
void *ivec)
|
|
{
|
|
struct evp_schedule *ctx = key->schedule->data;
|
|
EVP_CIPHER_CTX *c;
|
|
c = encryptp ? &ctx->ectx : &ctx->dctx;
|
|
if (ivec == NULL) {
|
|
/* alloca ? */
|
|
size_t len = EVP_CIPHER_CTX_iv_length(c);
|
|
void *loiv = malloc(len);
|
|
if (loiv == NULL) {
|
|
krb5_clear_error_message(context);
|
|
return ENOMEM;
|
|
}
|
|
memset(loiv, 0, len);
|
|
EVP_CipherInit_ex(c, NULL, NULL, NULL, loiv, -1);
|
|
free(loiv);
|
|
} else
|
|
EVP_CipherInit_ex(c, NULL, NULL, NULL, ivec, -1);
|
|
EVP_Cipher(c, data, data, len);
|
|
return 0;
|
|
}
|
|
|
|
static const unsigned char zero_ivec[EVP_MAX_BLOCK_LENGTH] = { 0 };
|
|
|
|
static krb5_error_code
|
|
evp_encrypt_cts(krb5_context context,
|
|
struct key_data *key,
|
|
void *data,
|
|
size_t len,
|
|
krb5_boolean encryptp,
|
|
int usage,
|
|
void *ivec)
|
|
{
|
|
size_t i, blocksize;
|
|
struct evp_schedule *ctx = key->schedule->data;
|
|
char tmp[EVP_MAX_BLOCK_LENGTH], ivec2[EVP_MAX_BLOCK_LENGTH];
|
|
EVP_CIPHER_CTX *c;
|
|
unsigned char *p;
|
|
|
|
c = encryptp ? &ctx->ectx : &ctx->dctx;
|
|
|
|
blocksize = EVP_CIPHER_CTX_block_size(c);
|
|
|
|
if (len < blocksize) {
|
|
krb5_set_error_message(context, EINVAL,
|
|
"message block too short");
|
|
return EINVAL;
|
|
} else if (len == blocksize) {
|
|
EVP_CipherInit_ex(c, NULL, NULL, NULL, zero_ivec, -1);
|
|
EVP_Cipher(c, data, data, len);
|
|
return 0;
|
|
}
|
|
|
|
if (ivec)
|
|
EVP_CipherInit_ex(c, NULL, NULL, NULL, ivec, -1);
|
|
else
|
|
EVP_CipherInit_ex(c, NULL, NULL, NULL, zero_ivec, -1);
|
|
|
|
if (encryptp) {
|
|
|
|
p = data;
|
|
i = ((len - 1) / blocksize) * blocksize;
|
|
EVP_Cipher(c, p, p, i);
|
|
p += i - blocksize;
|
|
len -= i;
|
|
memcpy(ivec2, p, blocksize);
|
|
|
|
for (i = 0; i < len; i++)
|
|
tmp[i] = p[i + blocksize] ^ ivec2[i];
|
|
for (; i < blocksize; i++)
|
|
tmp[i] = 0 ^ ivec2[i];
|
|
|
|
EVP_CipherInit_ex(c, NULL, NULL, NULL, zero_ivec, -1);
|
|
EVP_Cipher(c, p, tmp, blocksize);
|
|
|
|
memcpy(p + blocksize, ivec2, len);
|
|
if (ivec)
|
|
memcpy(ivec, p, blocksize);
|
|
} else {
|
|
char tmp2[EVP_MAX_BLOCK_LENGTH], tmp3[EVP_MAX_BLOCK_LENGTH];
|
|
|
|
p = data;
|
|
if (len > blocksize * 2) {
|
|
/* remove last two blocks and round up, decrypt this with cbc, then do cts dance */
|
|
i = ((((len - blocksize * 2) + blocksize - 1) / blocksize) * blocksize);
|
|
memcpy(ivec2, p + i - blocksize, blocksize);
|
|
EVP_Cipher(c, p, p, i);
|
|
p += i;
|
|
len -= i + blocksize;
|
|
} else {
|
|
if (ivec)
|
|
memcpy(ivec2, ivec, blocksize);
|
|
else
|
|
memcpy(ivec2, zero_ivec, blocksize);
|
|
len -= blocksize;
|
|
}
|
|
|
|
memcpy(tmp, p, blocksize);
|
|
EVP_CipherInit_ex(c, NULL, NULL, NULL, zero_ivec, -1);
|
|
EVP_Cipher(c, tmp2, p, blocksize);
|
|
|
|
memcpy(tmp3, p + blocksize, len);
|
|
memcpy(tmp3 + len, tmp2 + len, blocksize - len); /* xor 0 */
|
|
|
|
for (i = 0; i < len; i++)
|
|
p[i + blocksize] = tmp2[i] ^ tmp3[i];
|
|
|
|
EVP_CipherInit_ex(c, NULL, NULL, NULL, zero_ivec, -1);
|
|
EVP_Cipher(c, p, tmp3, blocksize);
|
|
|
|
for (i = 0; i < blocksize; i++)
|
|
p[i] ^= ivec2[i];
|
|
if (ivec)
|
|
memcpy(ivec, tmp, blocksize);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#ifdef HEIM_WEAK_CRYPTO
|
|
static krb5_error_code
|
|
evp_des_encrypt_null_ivec(krb5_context context,
|
|
struct key_data *key,
|
|
void *data,
|
|
size_t len,
|
|
krb5_boolean encryptp,
|
|
int usage,
|
|
void *ignore_ivec)
|
|
{
|
|
struct evp_schedule *ctx = key->schedule->data;
|
|
EVP_CIPHER_CTX *c;
|
|
DES_cblock ivec;
|
|
memset(&ivec, 0, sizeof(ivec));
|
|
c = encryptp ? &ctx->ectx : &ctx->dctx;
|
|
EVP_CipherInit_ex(c, NULL, NULL, NULL, (void *)&ivec, -1);
|
|
EVP_Cipher(c, data, data, len);
|
|
return 0;
|
|
}
|
|
|
|
static krb5_error_code
|
|
evp_des_encrypt_key_ivec(krb5_context context,
|
|
struct key_data *key,
|
|
void *data,
|
|
size_t len,
|
|
krb5_boolean encryptp,
|
|
int usage,
|
|
void *ignore_ivec)
|
|
{
|
|
struct evp_schedule *ctx = key->schedule->data;
|
|
EVP_CIPHER_CTX *c;
|
|
DES_cblock ivec;
|
|
memcpy(&ivec, key->key->keyvalue.data, sizeof(ivec));
|
|
c = encryptp ? &ctx->ectx : &ctx->dctx;
|
|
EVP_CipherInit_ex(c, NULL, NULL, NULL, (void *)&ivec, -1);
|
|
EVP_Cipher(c, data, data, len);
|
|
return 0;
|
|
}
|
|
|
|
static krb5_error_code
|
|
DES_CFB64_encrypt_null_ivec(krb5_context context,
|
|
struct key_data *key,
|
|
void *data,
|
|
size_t len,
|
|
krb5_boolean encryptp,
|
|
int usage,
|
|
void *ignore_ivec)
|
|
{
|
|
DES_cblock ivec;
|
|
int num = 0;
|
|
DES_key_schedule *s = key->schedule->data;
|
|
memset(&ivec, 0, sizeof(ivec));
|
|
|
|
DES_cfb64_encrypt(data, data, len, s, &ivec, &num, encryptp);
|
|
return 0;
|
|
}
|
|
|
|
static krb5_error_code
|
|
DES_PCBC_encrypt_key_ivec(krb5_context context,
|
|
struct key_data *key,
|
|
void *data,
|
|
size_t len,
|
|
krb5_boolean encryptp,
|
|
int usage,
|
|
void *ignore_ivec)
|
|
{
|
|
DES_cblock ivec;
|
|
DES_key_schedule *s = key->schedule->data;
|
|
memcpy(&ivec, key->key->keyvalue.data, sizeof(ivec));
|
|
|
|
DES_pcbc_encrypt(data, data, len, s, &ivec, encryptp);
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* section 6 of draft-brezak-win2k-krb-rc4-hmac-03
|
|
*
|
|
* warning: not for small children
|
|
*/
|
|
|
|
static krb5_error_code
|
|
ARCFOUR_subencrypt(krb5_context context,
|
|
struct key_data *key,
|
|
void *data,
|
|
size_t len,
|
|
unsigned usage,
|
|
void *ivec)
|
|
{
|
|
EVP_CIPHER_CTX ctx;
|
|
struct checksum_type *c = _find_checksum (CKSUMTYPE_RSA_MD5);
|
|
Checksum k1_c, k2_c, k3_c, cksum;
|
|
struct key_data ke;
|
|
krb5_keyblock kb;
|
|
unsigned char t[4];
|
|
unsigned char *cdata = data;
|
|
unsigned char k1_c_data[16], k2_c_data[16], k3_c_data[16];
|
|
krb5_error_code ret;
|
|
|
|
t[0] = (usage >> 0) & 0xFF;
|
|
t[1] = (usage >> 8) & 0xFF;
|
|
t[2] = (usage >> 16) & 0xFF;
|
|
t[3] = (usage >> 24) & 0xFF;
|
|
|
|
k1_c.checksum.length = sizeof(k1_c_data);
|
|
k1_c.checksum.data = k1_c_data;
|
|
|
|
ret = hmac(NULL, c, t, sizeof(t), 0, key, &k1_c);
|
|
if (ret)
|
|
krb5_abortx(context, "hmac failed");
|
|
|
|
memcpy (k2_c_data, k1_c_data, sizeof(k1_c_data));
|
|
|
|
k2_c.checksum.length = sizeof(k2_c_data);
|
|
k2_c.checksum.data = k2_c_data;
|
|
|
|
ke.key = &kb;
|
|
kb.keyvalue = k2_c.checksum;
|
|
|
|
cksum.checksum.length = 16;
|
|
cksum.checksum.data = data;
|
|
|
|
ret = hmac(NULL, c, cdata + 16, len - 16, 0, &ke, &cksum);
|
|
if (ret)
|
|
krb5_abortx(context, "hmac failed");
|
|
|
|
ke.key = &kb;
|
|
kb.keyvalue = k1_c.checksum;
|
|
|
|
k3_c.checksum.length = sizeof(k3_c_data);
|
|
k3_c.checksum.data = k3_c_data;
|
|
|
|
ret = hmac(NULL, c, data, 16, 0, &ke, &k3_c);
|
|
if (ret)
|
|
krb5_abortx(context, "hmac failed");
|
|
|
|
EVP_CIPHER_CTX_init(&ctx);
|
|
|
|
EVP_CipherInit_ex(&ctx, EVP_rc4(), NULL, k3_c.checksum.data, NULL, 1);
|
|
EVP_Cipher(&ctx, cdata + 16, cdata + 16, len - 16);
|
|
EVP_CIPHER_CTX_cleanup(&ctx);
|
|
|
|
memset (k1_c_data, 0, sizeof(k1_c_data));
|
|
memset (k2_c_data, 0, sizeof(k2_c_data));
|
|
memset (k3_c_data, 0, sizeof(k3_c_data));
|
|
return 0;
|
|
}
|
|
|
|
static krb5_error_code
|
|
ARCFOUR_subdecrypt(krb5_context context,
|
|
struct key_data *key,
|
|
void *data,
|
|
size_t len,
|
|
unsigned usage,
|
|
void *ivec)
|
|
{
|
|
EVP_CIPHER_CTX ctx;
|
|
struct checksum_type *c = _find_checksum (CKSUMTYPE_RSA_MD5);
|
|
Checksum k1_c, k2_c, k3_c, cksum;
|
|
struct key_data ke;
|
|
krb5_keyblock kb;
|
|
unsigned char t[4];
|
|
unsigned char *cdata = data;
|
|
unsigned char k1_c_data[16], k2_c_data[16], k3_c_data[16];
|
|
unsigned char cksum_data[16];
|
|
krb5_error_code ret;
|
|
|
|
t[0] = (usage >> 0) & 0xFF;
|
|
t[1] = (usage >> 8) & 0xFF;
|
|
t[2] = (usage >> 16) & 0xFF;
|
|
t[3] = (usage >> 24) & 0xFF;
|
|
|
|
k1_c.checksum.length = sizeof(k1_c_data);
|
|
k1_c.checksum.data = k1_c_data;
|
|
|
|
ret = hmac(NULL, c, t, sizeof(t), 0, key, &k1_c);
|
|
if (ret)
|
|
krb5_abortx(context, "hmac failed");
|
|
|
|
memcpy (k2_c_data, k1_c_data, sizeof(k1_c_data));
|
|
|
|
k2_c.checksum.length = sizeof(k2_c_data);
|
|
k2_c.checksum.data = k2_c_data;
|
|
|
|
ke.key = &kb;
|
|
kb.keyvalue = k1_c.checksum;
|
|
|
|
k3_c.checksum.length = sizeof(k3_c_data);
|
|
k3_c.checksum.data = k3_c_data;
|
|
|
|
ret = hmac(NULL, c, cdata, 16, 0, &ke, &k3_c);
|
|
if (ret)
|
|
krb5_abortx(context, "hmac failed");
|
|
|
|
EVP_CIPHER_CTX_init(&ctx);
|
|
EVP_CipherInit_ex(&ctx, EVP_rc4(), NULL, k3_c.checksum.data, NULL, 0);
|
|
EVP_Cipher(&ctx, cdata + 16, cdata + 16, len - 16);
|
|
EVP_CIPHER_CTX_cleanup(&ctx);
|
|
|
|
ke.key = &kb;
|
|
kb.keyvalue = k2_c.checksum;
|
|
|
|
cksum.checksum.length = 16;
|
|
cksum.checksum.data = cksum_data;
|
|
|
|
ret = hmac(NULL, c, cdata + 16, len - 16, 0, &ke, &cksum);
|
|
if (ret)
|
|
krb5_abortx(context, "hmac failed");
|
|
|
|
memset (k1_c_data, 0, sizeof(k1_c_data));
|
|
memset (k2_c_data, 0, sizeof(k2_c_data));
|
|
memset (k3_c_data, 0, sizeof(k3_c_data));
|
|
|
|
if (ct_memcmp (cksum.checksum.data, data, 16) != 0) {
|
|
krb5_clear_error_message (context);
|
|
return KRB5KRB_AP_ERR_BAD_INTEGRITY;
|
|
} else {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* convert the usage numbers used in
|
|
* draft-ietf-cat-kerb-key-derivation-00.txt to the ones in
|
|
* draft-brezak-win2k-krb-rc4-hmac-04.txt
|
|
*/
|
|
|
|
static krb5_error_code
|
|
usage2arcfour (krb5_context context, unsigned *usage)
|
|
{
|
|
switch (*usage) {
|
|
case KRB5_KU_AS_REP_ENC_PART : /* 3 */
|
|
*usage = 8;
|
|
return 0;
|
|
case KRB5_KU_USAGE_SEAL : /* 22 */
|
|
*usage = 13;
|
|
return 0;
|
|
case KRB5_KU_USAGE_SIGN : /* 23 */
|
|
*usage = 15;
|
|
return 0;
|
|
case KRB5_KU_USAGE_SEQ: /* 24 */
|
|
*usage = 0;
|
|
return 0;
|
|
default :
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
static krb5_error_code
|
|
ARCFOUR_encrypt(krb5_context context,
|
|
struct key_data *key,
|
|
void *data,
|
|
size_t len,
|
|
krb5_boolean encryptp,
|
|
int usage,
|
|
void *ivec)
|
|
{
|
|
krb5_error_code ret;
|
|
unsigned keyusage = usage;
|
|
|
|
if((ret = usage2arcfour (context, &keyusage)) != 0)
|
|
return ret;
|
|
|
|
if (encryptp)
|
|
return ARCFOUR_subencrypt (context, key, data, len, keyusage, ivec);
|
|
else
|
|
return ARCFOUR_subdecrypt (context, key, data, len, keyusage, ivec);
|
|
}
|
|
|
|
|
|
/*
|
|
*
|
|
*/
|
|
|
|
static krb5_error_code
|
|
AES_PRF(krb5_context context,
|
|
krb5_crypto crypto,
|
|
const krb5_data *in,
|
|
krb5_data *out)
|
|
{
|
|
struct checksum_type *ct = crypto->et->checksum;
|
|
krb5_error_code ret;
|
|
Checksum result;
|
|
krb5_keyblock *derived;
|
|
|
|
result.cksumtype = ct->type;
|
|
ret = krb5_data_alloc(&result.checksum, ct->checksumsize);
|
|
if (ret) {
|
|
krb5_set_error_message(context, ret, N_("malloc: out memory", ""));
|
|
return ret;
|
|
}
|
|
|
|
ret = (*ct->checksum)(context, NULL, in->data, in->length, 0, &result);
|
|
if (ret) {
|
|
krb5_data_free(&result.checksum);
|
|
return ret;
|
|
}
|
|
|
|
if (result.checksum.length < crypto->et->blocksize)
|
|
krb5_abortx(context, "internal prf error");
|
|
|
|
derived = NULL;
|
|
ret = krb5_derive_key(context, crypto->key.key,
|
|
crypto->et->type, "prf", 3, &derived);
|
|
if (ret)
|
|
krb5_abortx(context, "krb5_derive_key");
|
|
|
|
ret = krb5_data_alloc(out, crypto->et->blocksize);
|
|
if (ret)
|
|
krb5_abortx(context, "malloc failed");
|
|
|
|
{
|
|
const EVP_CIPHER *c = (*crypto->et->keytype->evp)();
|
|
EVP_CIPHER_CTX ctx;
|
|
|
|
EVP_CIPHER_CTX_init(&ctx); /* ivec all zero */
|
|
EVP_CipherInit_ex(&ctx, c, NULL, derived->keyvalue.data, NULL, 1);
|
|
EVP_Cipher(&ctx, out->data, result.checksum.data,
|
|
crypto->et->blocksize);
|
|
EVP_CIPHER_CTX_cleanup(&ctx);
|
|
}
|
|
|
|
krb5_data_free(&result.checksum);
|
|
krb5_free_keyblock(context, derived);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* these should currently be in reverse preference order.
|
|
* (only relevant for !F_PSEUDO) */
|
|
|
|
static struct encryption_type enctype_null = {
|
|
ETYPE_NULL,
|
|
"null",
|
|
1,
|
|
1,
|
|
0,
|
|
&keytype_null,
|
|
&checksum_none,
|
|
NULL,
|
|
F_DISABLED,
|
|
NULL_encrypt,
|
|
0,
|
|
NULL
|
|
};
|
|
static struct encryption_type enctype_arcfour_hmac_md5 = {
|
|
ETYPE_ARCFOUR_HMAC_MD5,
|
|
"arcfour-hmac-md5",
|
|
1,
|
|
1,
|
|
8,
|
|
&keytype_arcfour,
|
|
&checksum_hmac_md5,
|
|
NULL,
|
|
F_SPECIAL,
|
|
ARCFOUR_encrypt,
|
|
0,
|
|
NULL
|
|
};
|
|
#ifdef DES3_OLD_ENCTYPE
|
|
static struct encryption_type enctype_des3_cbc_md5 = {
|
|
ETYPE_DES3_CBC_MD5,
|
|
"des3-cbc-md5",
|
|
8,
|
|
8,
|
|
8,
|
|
&keytype_des3,
|
|
&checksum_rsa_md5,
|
|
&checksum_rsa_md5_des3,
|
|
0,
|
|
evp_encrypt,
|
|
0,
|
|
NULL
|
|
};
|
|
#endif
|
|
static struct encryption_type enctype_des3_cbc_sha1 = {
|
|
ETYPE_DES3_CBC_SHA1,
|
|
"des3-cbc-sha1",
|
|
8,
|
|
8,
|
|
8,
|
|
&keytype_des3_derived,
|
|
&checksum_sha1,
|
|
&checksum_hmac_sha1_des3,
|
|
F_DERIVED,
|
|
evp_encrypt,
|
|
0,
|
|
NULL
|
|
};
|
|
#ifdef DES3_OLD_ENCTYPE
|
|
static struct encryption_type enctype_old_des3_cbc_sha1 = {
|
|
ETYPE_OLD_DES3_CBC_SHA1,
|
|
"old-des3-cbc-sha1",
|
|
8,
|
|
8,
|
|
8,
|
|
&keytype_des3,
|
|
&checksum_sha1,
|
|
&checksum_hmac_sha1_des3,
|
|
0,
|
|
evp_encrypt,
|
|
0,
|
|
NULL
|
|
};
|
|
#endif
|
|
static struct encryption_type enctype_aes128_cts_hmac_sha1 = {
|
|
ETYPE_AES128_CTS_HMAC_SHA1_96,
|
|
"aes128-cts-hmac-sha1-96",
|
|
16,
|
|
1,
|
|
16,
|
|
&keytype_aes128,
|
|
&checksum_sha1,
|
|
&checksum_hmac_sha1_aes128,
|
|
F_DERIVED,
|
|
evp_encrypt_cts,
|
|
16,
|
|
AES_PRF
|
|
};
|
|
static struct encryption_type enctype_aes256_cts_hmac_sha1 = {
|
|
ETYPE_AES256_CTS_HMAC_SHA1_96,
|
|
"aes256-cts-hmac-sha1-96",
|
|
16,
|
|
1,
|
|
16,
|
|
&keytype_aes256,
|
|
&checksum_sha1,
|
|
&checksum_hmac_sha1_aes256,
|
|
F_DERIVED,
|
|
evp_encrypt_cts,
|
|
16,
|
|
AES_PRF
|
|
};
|
|
static struct encryption_type enctype_des3_cbc_none = {
|
|
ETYPE_DES3_CBC_NONE,
|
|
"des3-cbc-none",
|
|
8,
|
|
8,
|
|
0,
|
|
&keytype_des3_derived,
|
|
&checksum_none,
|
|
NULL,
|
|
F_PSEUDO,
|
|
evp_encrypt,
|
|
0,
|
|
NULL
|
|
};
|
|
#ifdef HEIM_WEAK_CRYPTO
|
|
static struct encryption_type enctype_des_cbc_crc = {
|
|
ETYPE_DES_CBC_CRC,
|
|
"des-cbc-crc",
|
|
8,
|
|
8,
|
|
8,
|
|
&keytype_des,
|
|
&checksum_crc32,
|
|
NULL,
|
|
F_DISABLED,
|
|
evp_des_encrypt_key_ivec,
|
|
0,
|
|
NULL
|
|
};
|
|
static struct encryption_type enctype_des_cbc_md4 = {
|
|
ETYPE_DES_CBC_MD4,
|
|
"des-cbc-md4",
|
|
8,
|
|
8,
|
|
8,
|
|
&keytype_des,
|
|
&checksum_rsa_md4,
|
|
&checksum_rsa_md4_des,
|
|
F_DISABLED,
|
|
evp_des_encrypt_null_ivec,
|
|
0,
|
|
NULL
|
|
};
|
|
static struct encryption_type enctype_des_cbc_md5 = {
|
|
ETYPE_DES_CBC_MD5,
|
|
"des-cbc-md5",
|
|
8,
|
|
8,
|
|
8,
|
|
&keytype_des,
|
|
&checksum_rsa_md5,
|
|
&checksum_rsa_md5_des,
|
|
F_DISABLED,
|
|
evp_des_encrypt_null_ivec,
|
|
0,
|
|
NULL
|
|
};
|
|
static struct encryption_type enctype_des_cbc_none = {
|
|
ETYPE_DES_CBC_NONE,
|
|
"des-cbc-none",
|
|
8,
|
|
8,
|
|
0,
|
|
&keytype_des,
|
|
&checksum_none,
|
|
NULL,
|
|
F_PSEUDO|F_DISABLED,
|
|
evp_des_encrypt_null_ivec,
|
|
0,
|
|
NULL
|
|
};
|
|
static struct encryption_type enctype_des_cfb64_none = {
|
|
ETYPE_DES_CFB64_NONE,
|
|
"des-cfb64-none",
|
|
1,
|
|
1,
|
|
0,
|
|
&keytype_des_old,
|
|
&checksum_none,
|
|
NULL,
|
|
F_PSEUDO|F_DISABLED,
|
|
DES_CFB64_encrypt_null_ivec,
|
|
0,
|
|
NULL
|
|
};
|
|
static struct encryption_type enctype_des_pcbc_none = {
|
|
ETYPE_DES_PCBC_NONE,
|
|
"des-pcbc-none",
|
|
8,
|
|
8,
|
|
0,
|
|
&keytype_des_old,
|
|
&checksum_none,
|
|
NULL,
|
|
F_PSEUDO|F_DISABLED,
|
|
DES_PCBC_encrypt_key_ivec,
|
|
0,
|
|
NULL
|
|
};
|
|
#endif /* HEIM_WEAK_CRYPTO */
|
|
|
|
static struct encryption_type *etypes[] = {
|
|
&enctype_aes256_cts_hmac_sha1,
|
|
&enctype_aes128_cts_hmac_sha1,
|
|
&enctype_des3_cbc_sha1,
|
|
&enctype_des3_cbc_none, /* used by the gss-api mech */
|
|
&enctype_arcfour_hmac_md5,
|
|
#ifdef DES3_OLD_ENCTYPE
|
|
&enctype_des3_cbc_md5,
|
|
&enctype_old_des3_cbc_sha1,
|
|
#endif
|
|
#ifdef HEIM_WEAK_CRYPTO
|
|
&enctype_des_cbc_crc,
|
|
&enctype_des_cbc_md4,
|
|
&enctype_des_cbc_md5,
|
|
&enctype_des_cbc_none,
|
|
&enctype_des_cfb64_none,
|
|
&enctype_des_pcbc_none,
|
|
#endif
|
|
&enctype_null
|
|
};
|
|
|
|
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_LIB_FUNCTION
|
|
krb5_enctype_to_string(krb5_context context,
|
|
krb5_enctype etype,
|
|
char **string)
|
|
{
|
|
struct encryption_type *e;
|
|
e = _find_enctype(etype);
|
|
if(e == NULL) {
|
|
krb5_set_error_message (context, KRB5_PROG_ETYPE_NOSUPP,
|
|
N_("encryption type %d not supported", ""),
|
|
etype);
|
|
*string = NULL;
|
|
return KRB5_PROG_ETYPE_NOSUPP;
|
|
}
|
|
*string = strdup(e->name);
|
|
if(*string == NULL) {
|
|
krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
|
|
return ENOMEM;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
krb5_error_code KRB5_LIB_FUNCTION
|
|
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;
|
|
}
|
|
krb5_set_error_message (context, KRB5_PROG_ETYPE_NOSUPP,
|
|
N_("encryption type %s not supported", ""),
|
|
string);
|
|
return KRB5_PROG_ETYPE_NOSUPP;
|
|
}
|
|
|
|
krb5_error_code KRB5_LIB_FUNCTION
|
|
krb5_enctype_to_keytype(krb5_context context,
|
|
krb5_enctype etype,
|
|
krb5_keytype *keytype)
|
|
{
|
|
struct encryption_type *e = _find_enctype(etype);
|
|
if(e == NULL) {
|
|
krb5_set_error_message (context, KRB5_PROG_ETYPE_NOSUPP,
|
|
N_("encryption type %d not supported", ""),
|
|
etype);
|
|
return KRB5_PROG_ETYPE_NOSUPP;
|
|
}
|
|
*keytype = e->keytype->type; /* XXX */
|
|
return 0;
|
|
}
|
|
|
|
krb5_error_code KRB5_LIB_FUNCTION
|
|
krb5_enctype_valid(krb5_context context,
|
|
krb5_enctype etype)
|
|
{
|
|
struct encryption_type *e = _find_enctype(etype);
|
|
if(e == NULL) {
|
|
krb5_set_error_message (context, KRB5_PROG_ETYPE_NOSUPP,
|
|
N_("encryption type %d not supported", ""),
|
|
etype);
|
|
return KRB5_PROG_ETYPE_NOSUPP;
|
|
}
|
|
if (e->flags & F_DISABLED) {
|
|
krb5_set_error_message (context, KRB5_PROG_ETYPE_NOSUPP,
|
|
N_("encryption type %s is disabled", ""),
|
|
e->name);
|
|
return KRB5_PROG_ETYPE_NOSUPP;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Return the coresponding encryption type for a checksum type.
|
|
*
|
|
* @param context Kerberos context
|
|
* @param ctype The checksum type to get the result enctype for
|
|
* @param etype The returned encryption, when the matching etype is
|
|
* not found, etype is set to ETYPE_NULL.
|
|
*
|
|
* @return Return an error code for an failure or 0 on success.
|
|
* @ingroup krb5_crypto
|
|
*/
|
|
|
|
|
|
krb5_error_code KRB5_LIB_FUNCTION
|
|
krb5_cksumtype_to_enctype(krb5_context context,
|
|
krb5_cksumtype ctype,
|
|
krb5_enctype *etype)
|
|
{
|
|
int i;
|
|
|
|
*etype = ETYPE_NULL;
|
|
|
|
for(i = 0; i < num_etypes; i++) {
|
|
if(etypes[i]->keyed_checksum &&
|
|
etypes[i]->keyed_checksum->type == ctype)
|
|
{
|
|
*etype = etypes[i]->type;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
|
|
N_("checksum type %d not supported", ""),
|
|
(int)ctype);
|
|
return KRB5_PROG_SUMTYPE_NOSUPP;
|
|
}
|
|
|
|
|
|
krb5_error_code KRB5_LIB_FUNCTION
|
|
krb5_cksumtype_valid(krb5_context context,
|
|
krb5_cksumtype ctype)
|
|
{
|
|
struct checksum_type *c = _find_checksum(ctype);
|
|
if (c == NULL) {
|
|
krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
|
|
N_("checksum type %d not supported", ""),
|
|
ctype);
|
|
return KRB5_PROG_SUMTYPE_NOSUPP;
|
|
}
|
|
if (c->flags & F_DISABLED) {
|
|
krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
|
|
N_("checksum type %s is disabled", ""),
|
|
c->name);
|
|
return KRB5_PROG_SUMTYPE_NOSUPP;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
static krb5_boolean
|
|
derived_crypto(krb5_context context,
|
|
krb5_crypto crypto)
|
|
{
|
|
return (crypto->et->flags & F_DERIVED) != 0;
|
|
}
|
|
|
|
static krb5_boolean
|
|
special_crypto(krb5_context context,
|
|
krb5_crypto crypto)
|
|
{
|
|
return (crypto->et->flags & F_SPECIAL) != 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,
|
|
const void *data,
|
|
size_t len,
|
|
krb5_data *result,
|
|
void *ivec)
|
|
{
|
|
size_t sz, block_sz, checksum_sz, total_sz;
|
|
Checksum cksum;
|
|
unsigned char *p, *q;
|
|
krb5_error_code ret;
|
|
struct key_data *dkey;
|
|
const struct encryption_type *et = crypto->et;
|
|
|
|
checksum_sz = CHECKSUMSIZE(et->keyed_checksum);
|
|
|
|
sz = et->confoundersize + len;
|
|
block_sz = (sz + et->padsize - 1) &~ (et->padsize - 1); /* pad */
|
|
total_sz = block_sz + checksum_sz;
|
|
p = calloc(1, total_sz);
|
|
if(p == NULL) {
|
|
krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
|
|
return ENOMEM;
|
|
}
|
|
|
|
q = p;
|
|
krb5_generate_random_block(q, et->confoundersize); /* XXX */
|
|
q += et->confoundersize;
|
|
memcpy(q, data, len);
|
|
|
|
ret = create_checksum(context,
|
|
et->keyed_checksum,
|
|
crypto,
|
|
INTEGRITY_USAGE(usage),
|
|
p,
|
|
block_sz,
|
|
&cksum);
|
|
if(ret == 0 && cksum.checksum.length != checksum_sz) {
|
|
free_Checksum (&cksum);
|
|
krb5_clear_error_message (context);
|
|
ret = KRB5_CRYPTO_INTERNAL;
|
|
}
|
|
if(ret)
|
|
goto fail;
|
|
memcpy(p + block_sz, cksum.checksum.data, cksum.checksum.length);
|
|
free_Checksum (&cksum);
|
|
ret = _get_derived_key(context, crypto, ENCRYPTION_USAGE(usage), &dkey);
|
|
if(ret)
|
|
goto fail;
|
|
ret = _key_schedule(context, dkey);
|
|
if(ret)
|
|
goto fail;
|
|
ret = (*et->encrypt)(context, dkey, p, block_sz, 1, usage, ivec);
|
|
if (ret)
|
|
goto fail;
|
|
result->data = p;
|
|
result->length = total_sz;
|
|
return 0;
|
|
fail:
|
|
memset(p, 0, total_sz);
|
|
free(p);
|
|
return ret;
|
|
}
|
|
|
|
|
|
static krb5_error_code
|
|
encrypt_internal(krb5_context context,
|
|
krb5_crypto crypto,
|
|
const void *data,
|
|
size_t len,
|
|
krb5_data *result,
|
|
void *ivec)
|
|
{
|
|
size_t sz, block_sz, checksum_sz;
|
|
Checksum cksum;
|
|
unsigned char *p, *q;
|
|
krb5_error_code ret;
|
|
const struct encryption_type *et = crypto->et;
|
|
|
|
checksum_sz = CHECKSUMSIZE(et->checksum);
|
|
|
|
sz = et->confoundersize + checksum_sz + len;
|
|
block_sz = (sz + et->padsize - 1) &~ (et->padsize - 1); /* pad */
|
|
p = calloc(1, block_sz);
|
|
if(p == NULL) {
|
|
krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
|
|
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,
|
|
et->checksum,
|
|
crypto,
|
|
0,
|
|
p,
|
|
block_sz,
|
|
&cksum);
|
|
if(ret == 0 && cksum.checksum.length != checksum_sz) {
|
|
krb5_clear_error_message (context);
|
|
free_Checksum(&cksum);
|
|
ret = KRB5_CRYPTO_INTERNAL;
|
|
}
|
|
if(ret)
|
|
goto fail;
|
|
memcpy(p + et->confoundersize, cksum.checksum.data, cksum.checksum.length);
|
|
free_Checksum(&cksum);
|
|
ret = _key_schedule(context, &crypto->key);
|
|
if(ret)
|
|
goto fail;
|
|
ret = (*et->encrypt)(context, &crypto->key, p, block_sz, 1, 0, ivec);
|
|
if (ret) {
|
|
memset(p, 0, block_sz);
|
|
free(p);
|
|
return ret;
|
|
}
|
|
result->data = p;
|
|
result->length = block_sz;
|
|
return 0;
|
|
fail:
|
|
memset(p, 0, block_sz);
|
|
free(p);
|
|
return ret;
|
|
}
|
|
|
|
static krb5_error_code
|
|
encrypt_internal_special(krb5_context context,
|
|
krb5_crypto crypto,
|
|
int usage,
|
|
const void *data,
|
|
size_t len,
|
|
krb5_data *result,
|
|
void *ivec)
|
|
{
|
|
struct encryption_type *et = crypto->et;
|
|
size_t cksum_sz = CHECKSUMSIZE(et->checksum);
|
|
size_t sz = len + cksum_sz + et->confoundersize;
|
|
char *tmp, *p;
|
|
krb5_error_code ret;
|
|
|
|
tmp = malloc (sz);
|
|
if (tmp == NULL) {
|
|
krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
|
|
return ENOMEM;
|
|
}
|
|
p = tmp;
|
|
memset (p, 0, cksum_sz);
|
|
p += cksum_sz;
|
|
krb5_generate_random_block(p, et->confoundersize);
|
|
p += et->confoundersize;
|
|
memcpy (p, data, len);
|
|
ret = (*et->encrypt)(context, &crypto->key, tmp, sz, TRUE, usage, ivec);
|
|
if (ret) {
|
|
memset(tmp, 0, sz);
|
|
free(tmp);
|
|
return ret;
|
|
}
|
|
result->data = tmp;
|
|
result->length = 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,
|
|
void *ivec)
|
|
{
|
|
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;
|
|
|
|
checksum_sz = CHECKSUMSIZE(et->keyed_checksum);
|
|
if (len < checksum_sz + et->confoundersize) {
|
|
krb5_set_error_message(context, KRB5_BAD_MSIZE,
|
|
N_("Encrypted data shorter then "
|
|
"checksum + confunder", ""));
|
|
return KRB5_BAD_MSIZE;
|
|
}
|
|
|
|
if (((len - checksum_sz) % et->padsize) != 0) {
|
|
krb5_clear_error_message(context);
|
|
return KRB5_BAD_MSIZE;
|
|
}
|
|
|
|
p = malloc(len);
|
|
if(len != 0 && p == NULL) {
|
|
krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
|
|
return ENOMEM;
|
|
}
|
|
memcpy(p, data, len);
|
|
|
|
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;
|
|
}
|
|
ret = (*et->encrypt)(context, dkey, p, len, 0, usage, ivec);
|
|
if (ret) {
|
|
free(p);
|
|
return ret;
|
|
}
|
|
|
|
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(result->data == NULL && l != 0) {
|
|
free(p);
|
|
krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
|
|
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,
|
|
void *ivec)
|
|
{
|
|
krb5_error_code ret;
|
|
unsigned char *p;
|
|
Checksum cksum;
|
|
size_t checksum_sz, l;
|
|
struct encryption_type *et = crypto->et;
|
|
|
|
if ((len % et->padsize) != 0) {
|
|
krb5_clear_error_message(context);
|
|
return KRB5_BAD_MSIZE;
|
|
}
|
|
|
|
checksum_sz = CHECKSUMSIZE(et->checksum);
|
|
p = malloc(len);
|
|
if(len != 0 && p == NULL) {
|
|
krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
|
|
return ENOMEM;
|
|
}
|
|
memcpy(p, data, len);
|
|
|
|
ret = _key_schedule(context, &crypto->key);
|
|
if(ret) {
|
|
free(p);
|
|
return ret;
|
|
}
|
|
ret = (*et->encrypt)(context, &crypto->key, p, len, 0, 0, ivec);
|
|
if (ret) {
|
|
free(p);
|
|
return ret;
|
|
}
|
|
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->checksum);
|
|
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 && l != 0) {
|
|
free(p);
|
|
krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
|
|
return ENOMEM;
|
|
}
|
|
result->length = l;
|
|
return 0;
|
|
}
|
|
|
|
static krb5_error_code
|
|
decrypt_internal_special(krb5_context context,
|
|
krb5_crypto crypto,
|
|
int usage,
|
|
void *data,
|
|
size_t len,
|
|
krb5_data *result,
|
|
void *ivec)
|
|
{
|
|
struct encryption_type *et = crypto->et;
|
|
size_t cksum_sz = CHECKSUMSIZE(et->checksum);
|
|
size_t sz = len - cksum_sz - et->confoundersize;
|
|
unsigned char *p;
|
|
krb5_error_code ret;
|
|
|
|
if ((len % et->padsize) != 0) {
|
|
krb5_clear_error_message(context);
|
|
return KRB5_BAD_MSIZE;
|
|
}
|
|
|
|
p = malloc (len);
|
|
if (p == NULL) {
|
|
krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
|
|
return ENOMEM;
|
|
}
|
|
memcpy(p, data, len);
|
|
|
|
ret = (*et->encrypt)(context, &crypto->key, p, len, FALSE, usage, ivec);
|
|
if (ret) {
|
|
free(p);
|
|
return ret;
|
|
}
|
|
|
|
memmove (p, p + cksum_sz + et->confoundersize, sz);
|
|
result->data = realloc(p, sz);
|
|
if(result->data == NULL && sz != 0) {
|
|
free(p);
|
|
krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
|
|
return ENOMEM;
|
|
}
|
|
result->length = sz;
|
|
return 0;
|
|
}
|
|
|
|
static krb5_crypto_iov *
|
|
find_iv(krb5_crypto_iov *data, int num_data, int type)
|
|
{
|
|
int i;
|
|
for (i = 0; i < num_data; i++)
|
|
if (data[i].flags == type)
|
|
return &data[i];
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* Inline encrypt a kerberos message
|
|
*
|
|
* @param context Kerberos context
|
|
* @param crypto Kerberos crypto context
|
|
* @param usage Key usage for this buffer
|
|
* @param data array of buffers to process
|
|
* @param num_data length of array
|
|
* @param ivec initial cbc/cts vector
|
|
*
|
|
* @return Return an error code or 0.
|
|
* @ingroup krb5_crypto
|
|
*
|
|
* Kerberos encrypted data look like this:
|
|
*
|
|
* 1. KRB5_CRYPTO_TYPE_HEADER
|
|
* 2. array [1,...] KRB5_CRYPTO_TYPE_DATA and array [0,...]
|
|
* KRB5_CRYPTO_TYPE_SIGN_ONLY in any order, however the receiver
|
|
* have to aware of the order. KRB5_CRYPTO_TYPE_SIGN_ONLY is
|
|
* commonly used headers and trailers.
|
|
* 3. KRB5_CRYPTO_TYPE_PADDING, at least on padsize long if padsize > 1
|
|
* 4. KRB5_CRYPTO_TYPE_TRAILER
|
|
*/
|
|
|
|
krb5_error_code KRB5_LIB_FUNCTION
|
|
krb5_encrypt_iov_ivec(krb5_context context,
|
|
krb5_crypto crypto,
|
|
unsigned usage,
|
|
krb5_crypto_iov *data,
|
|
int num_data,
|
|
void *ivec)
|
|
{
|
|
size_t headersz, trailersz, len;
|
|
int i;
|
|
size_t sz, block_sz, pad_sz;
|
|
Checksum cksum;
|
|
unsigned char *p, *q;
|
|
krb5_error_code ret;
|
|
struct key_data *dkey;
|
|
const struct encryption_type *et = crypto->et;
|
|
krb5_crypto_iov *tiv, *piv, *hiv;
|
|
|
|
if (num_data < 0) {
|
|
krb5_clear_error_message(context);
|
|
return KRB5_CRYPTO_INTERNAL;
|
|
}
|
|
|
|
if(!derived_crypto(context, crypto)) {
|
|
krb5_clear_error_message(context);
|
|
return KRB5_CRYPTO_INTERNAL;
|
|
}
|
|
|
|
headersz = et->confoundersize;
|
|
trailersz = CHECKSUMSIZE(et->keyed_checksum);
|
|
|
|
for (len = 0, i = 0; i < num_data; i++) {
|
|
if (data[i].flags != KRB5_CRYPTO_TYPE_DATA)
|
|
continue;
|
|
len += data[i].data.length;
|
|
}
|
|
|
|
sz = headersz + len;
|
|
block_sz = (sz + et->padsize - 1) &~ (et->padsize - 1); /* pad */
|
|
|
|
pad_sz = block_sz - sz;
|
|
|
|
/* header */
|
|
|
|
hiv = find_iv(data, num_data, KRB5_CRYPTO_TYPE_HEADER);
|
|
if (hiv == NULL || hiv->data.length != headersz)
|
|
return KRB5_BAD_MSIZE;
|
|
|
|
krb5_generate_random_block(hiv->data.data, hiv->data.length);
|
|
|
|
/* padding */
|
|
piv = find_iv(data, num_data, KRB5_CRYPTO_TYPE_PADDING);
|
|
/* its ok to have no TYPE_PADDING if there is no padding */
|
|
if (piv == NULL && pad_sz != 0)
|
|
return KRB5_BAD_MSIZE;
|
|
if (piv) {
|
|
if (piv->data.length < pad_sz)
|
|
return KRB5_BAD_MSIZE;
|
|
piv->data.length = pad_sz;
|
|
if (pad_sz)
|
|
memset(piv->data.data, pad_sz, pad_sz);
|
|
else
|
|
piv = NULL;
|
|
}
|
|
|
|
/* trailer */
|
|
tiv = find_iv(data, num_data, KRB5_CRYPTO_TYPE_TRAILER);
|
|
if (tiv == NULL || tiv->data.length != trailersz)
|
|
return KRB5_BAD_MSIZE;
|
|
|
|
/*
|
|
* XXX replace with EVP_Sign? at least make create_checksum an iov
|
|
* function.
|
|
* XXX CTS EVP is broken, can't handle multi buffers :(
|
|
*/
|
|
|
|
len = block_sz;
|
|
for (i = 0; i < num_data; i++) {
|
|
if (data[i].flags != KRB5_CRYPTO_TYPE_SIGN_ONLY)
|
|
continue;
|
|
len += data[i].data.length;
|
|
}
|
|
|
|
p = q = malloc(len);
|
|
|
|
memcpy(q, hiv->data.data, hiv->data.length);
|
|
q += hiv->data.length;
|
|
for (i = 0; i < num_data; i++) {
|
|
if (data[i].flags != KRB5_CRYPTO_TYPE_DATA &&
|
|
data[i].flags != KRB5_CRYPTO_TYPE_SIGN_ONLY)
|
|
continue;
|
|
memcpy(q, data[i].data.data, data[i].data.length);
|
|
q += data[i].data.length;
|
|
}
|
|
if (piv)
|
|
memset(q, 0, piv->data.length);
|
|
|
|
ret = create_checksum(context,
|
|
et->keyed_checksum,
|
|
crypto,
|
|
INTEGRITY_USAGE(usage),
|
|
p,
|
|
len,
|
|
&cksum);
|
|
free(p);
|
|
if(ret == 0 && cksum.checksum.length != trailersz) {
|
|
free_Checksum (&cksum);
|
|
krb5_clear_error_message (context);
|
|
ret = KRB5_CRYPTO_INTERNAL;
|
|
}
|
|
if(ret)
|
|
return ret;
|
|
|
|
/* save cksum at end */
|
|
memcpy(tiv->data.data, cksum.checksum.data, cksum.checksum.length);
|
|
free_Checksum (&cksum);
|
|
|
|
/* XXX replace with EVP_Cipher */
|
|
p = q = malloc(block_sz);
|
|
if(p == NULL)
|
|
return ENOMEM;
|
|
|
|
memcpy(q, hiv->data.data, hiv->data.length);
|
|
q += hiv->data.length;
|
|
|
|
for (i = 0; i < num_data; i++) {
|
|
if (data[i].flags != KRB5_CRYPTO_TYPE_DATA)
|
|
continue;
|
|
memcpy(q, data[i].data.data, data[i].data.length);
|
|
q += data[i].data.length;
|
|
}
|
|
if (piv)
|
|
memset(q, 0, piv->data.length);
|
|
|
|
|
|
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;
|
|
}
|
|
|
|
ret = (*et->encrypt)(context, dkey, p, block_sz, 1, usage, ivec);
|
|
if (ret) {
|
|
free(p);
|
|
return ret;
|
|
}
|
|
|
|
/* now copy data back to buffers */
|
|
q = p;
|
|
|
|
memcpy(hiv->data.data, q, hiv->data.length);
|
|
q += hiv->data.length;
|
|
|
|
for (i = 0; i < num_data; i++) {
|
|
if (data[i].flags != KRB5_CRYPTO_TYPE_DATA)
|
|
continue;
|
|
memcpy(data[i].data.data, q, data[i].data.length);
|
|
q += data[i].data.length;
|
|
}
|
|
if (piv)
|
|
memcpy(piv->data.data, q, pad_sz);
|
|
|
|
free(p);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* Inline decrypt a Kerberos message.
|
|
*
|
|
* @param context Kerberos context
|
|
* @param crypto Kerberos crypto context
|
|
* @param usage Key usage for this buffer
|
|
* @param data array of buffers to process
|
|
* @param num_data length of array
|
|
* @param ivec initial cbc/cts vector
|
|
*
|
|
* @return Return an error code or 0.
|
|
* @ingroup krb5_crypto
|
|
*
|
|
* 1. KRB5_CRYPTO_TYPE_HEADER
|
|
* 2. one KRB5_CRYPTO_TYPE_DATA and array [0,...] of KRB5_CRYPTO_TYPE_SIGN_ONLY in
|
|
* any order, however the receiver have to aware of the
|
|
* order. KRB5_CRYPTO_TYPE_SIGN_ONLY is commonly used unencrypoted
|
|
* protocol headers and trailers. The output data will be of same
|
|
* size as the input data or shorter.
|
|
*/
|
|
|
|
krb5_error_code KRB5_LIB_FUNCTION
|
|
krb5_decrypt_iov_ivec(krb5_context context,
|
|
krb5_crypto crypto,
|
|
unsigned usage,
|
|
krb5_crypto_iov *data,
|
|
unsigned int num_data,
|
|
void *ivec)
|
|
{
|
|
unsigned int i;
|
|
size_t headersz, trailersz, len;
|
|
Checksum cksum;
|
|
unsigned char *p, *q;
|
|
krb5_error_code ret;
|
|
struct key_data *dkey;
|
|
struct encryption_type *et = crypto->et;
|
|
krb5_crypto_iov *tiv, *hiv;
|
|
|
|
if (num_data < 0) {
|
|
krb5_clear_error_message(context);
|
|
return KRB5_CRYPTO_INTERNAL;
|
|
}
|
|
|
|
if(!derived_crypto(context, crypto)) {
|
|
krb5_clear_error_message(context);
|
|
return KRB5_CRYPTO_INTERNAL;
|
|
}
|
|
|
|
headersz = et->confoundersize;
|
|
|
|
hiv = find_iv(data, num_data, KRB5_CRYPTO_TYPE_HEADER);
|
|
if (hiv == NULL || hiv->data.length != headersz)
|
|
return KRB5_BAD_MSIZE;
|
|
|
|
/* trailer */
|
|
trailersz = CHECKSUMSIZE(et->keyed_checksum);
|
|
|
|
tiv = find_iv(data, num_data, KRB5_CRYPTO_TYPE_TRAILER);
|
|
if (tiv->data.length != trailersz)
|
|
return KRB5_BAD_MSIZE;
|
|
|
|
/* Find length of data we will decrypt */
|
|
|
|
len = headersz;
|
|
for (i = 0; i < num_data; i++) {
|
|
if (data[i].flags != KRB5_CRYPTO_TYPE_DATA)
|
|
continue;
|
|
len += data[i].data.length;
|
|
}
|
|
|
|
if ((len % et->padsize) != 0) {
|
|
krb5_clear_error_message(context);
|
|
return KRB5_BAD_MSIZE;
|
|
}
|
|
|
|
/* XXX replace with EVP_Cipher */
|
|
|
|
p = q = malloc(len);
|
|
if (p == NULL)
|
|
return ENOMEM;
|
|
|
|
memcpy(q, hiv->data.data, hiv->data.length);
|
|
q += hiv->data.length;
|
|
|
|
for (i = 0; i < num_data; i++) {
|
|
if (data[i].flags != KRB5_CRYPTO_TYPE_DATA)
|
|
continue;
|
|
memcpy(q, data[i].data.data, data[i].data.length);
|
|
q += data[i].data.length;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
ret = (*et->encrypt)(context, dkey, p, len, 0, usage, ivec);
|
|
if (ret) {
|
|
free(p);
|
|
return ret;
|
|
}
|
|
|
|
/* copy data back to buffers */
|
|
memcpy(hiv->data.data, p, hiv->data.length);
|
|
q = p + hiv->data.length;
|
|
for (i = 0; i < num_data; i++) {
|
|
if (data[i].flags != KRB5_CRYPTO_TYPE_DATA)
|
|
continue;
|
|
memcpy(data[i].data.data, q, data[i].data.length);
|
|
q += data[i].data.length;
|
|
}
|
|
|
|
free(p);
|
|
|
|
/* check signature */
|
|
for (i = 0; i < num_data; i++) {
|
|
if (data[i].flags != KRB5_CRYPTO_TYPE_SIGN_ONLY)
|
|
continue;
|
|
len += data[i].data.length;
|
|
}
|
|
|
|
p = q = malloc(len);
|
|
if (p == NULL)
|
|
return ENOMEM;
|
|
|
|
memcpy(q, hiv->data.data, hiv->data.length);
|
|
q += hiv->data.length;
|
|
for (i = 0; i < num_data; i++) {
|
|
if (data[i].flags != KRB5_CRYPTO_TYPE_DATA &&
|
|
data[i].flags != KRB5_CRYPTO_TYPE_SIGN_ONLY)
|
|
continue;
|
|
memcpy(q, data[i].data.data, data[i].data.length);
|
|
q += data[i].data.length;
|
|
}
|
|
|
|
cksum.checksum.data = tiv->data.data;
|
|
cksum.checksum.length = tiv->data.length;
|
|
cksum.cksumtype = CHECKSUMTYPE(et->keyed_checksum);
|
|
|
|
ret = verify_checksum(context,
|
|
crypto,
|
|
INTEGRITY_USAGE(usage),
|
|
p,
|
|
len,
|
|
&cksum);
|
|
free(p);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* Create a Kerberos message checksum.
|
|
*
|
|
* @param context Kerberos context
|
|
* @param crypto Kerberos crypto context
|
|
* @param usage Key usage for this buffer
|
|
* @param data array of buffers to process
|
|
* @param num_data length of array
|
|
* @param type output data
|
|
*
|
|
* @return Return an error code or 0.
|
|
* @ingroup krb5_crypto
|
|
*/
|
|
|
|
krb5_error_code KRB5_LIB_FUNCTION
|
|
krb5_create_checksum_iov(krb5_context context,
|
|
krb5_crypto crypto,
|
|
unsigned usage,
|
|
krb5_crypto_iov *data,
|
|
unsigned int num_data,
|
|
krb5_cksumtype *type)
|
|
{
|
|
Checksum cksum;
|
|
krb5_crypto_iov *civ;
|
|
krb5_error_code ret;
|
|
int i;
|
|
size_t len;
|
|
char *p, *q;
|
|
|
|
if (num_data < 0) {
|
|
krb5_clear_error_message(context);
|
|
return KRB5_CRYPTO_INTERNAL;
|
|
}
|
|
|
|
if(!derived_crypto(context, crypto)) {
|
|
krb5_clear_error_message(context);
|
|
return KRB5_CRYPTO_INTERNAL;
|
|
}
|
|
|
|
civ = find_iv(data, num_data, KRB5_CRYPTO_TYPE_CHECKSUM);
|
|
if (civ == NULL)
|
|
return KRB5_BAD_MSIZE;
|
|
|
|
len = 0;
|
|
for (i = 0; i < num_data; i++) {
|
|
if (data[i].flags != KRB5_CRYPTO_TYPE_DATA &&
|
|
data[i].flags != KRB5_CRYPTO_TYPE_SIGN_ONLY)
|
|
continue;
|
|
len += data[i].data.length;
|
|
}
|
|
|
|
p = q = malloc(len);
|
|
|
|
for (i = 0; i < num_data; i++) {
|
|
if (data[i].flags != KRB5_CRYPTO_TYPE_DATA &&
|
|
data[i].flags != KRB5_CRYPTO_TYPE_SIGN_ONLY)
|
|
continue;
|
|
memcpy(q, data[i].data.data, data[i].data.length);
|
|
q += data[i].data.length;
|
|
}
|
|
|
|
ret = krb5_create_checksum(context, crypto, usage, 0, p, len, &cksum);
|
|
free(p);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (type)
|
|
*type = cksum.cksumtype;
|
|
|
|
if (cksum.checksum.length > civ->data.length) {
|
|
krb5_set_error_message(context, KRB5_BAD_MSIZE,
|
|
N_("Checksum larger then input buffer", ""));
|
|
free_Checksum(&cksum);
|
|
return KRB5_BAD_MSIZE;
|
|
}
|
|
|
|
civ->data.length = cksum.checksum.length;
|
|
memcpy(civ->data.data, cksum.checksum.data, civ->data.length);
|
|
free_Checksum(&cksum);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Verify a Kerberos message checksum.
|
|
*
|
|
* @param context Kerberos context
|
|
* @param crypto Kerberos crypto context
|
|
* @param usage Key usage for this buffer
|
|
* @param data array of buffers to process
|
|
* @param num_data length of array
|
|
* @param type return checksum type if not NULL
|
|
*
|
|
* @return Return an error code or 0.
|
|
* @ingroup krb5_crypto
|
|
*/
|
|
|
|
krb5_error_code KRB5_LIB_FUNCTION
|
|
krb5_verify_checksum_iov(krb5_context context,
|
|
krb5_crypto crypto,
|
|
unsigned usage,
|
|
krb5_crypto_iov *data,
|
|
unsigned int num_data,
|
|
krb5_cksumtype *type)
|
|
{
|
|
struct encryption_type *et = crypto->et;
|
|
Checksum cksum;
|
|
krb5_crypto_iov *civ;
|
|
krb5_error_code ret;
|
|
int i;
|
|
size_t len;
|
|
char *p, *q;
|
|
|
|
if (num_data < 0) {
|
|
krb5_clear_error_message(context);
|
|
return KRB5_CRYPTO_INTERNAL;
|
|
}
|
|
|
|
if(!derived_crypto(context, crypto)) {
|
|
krb5_clear_error_message(context);
|
|
return KRB5_CRYPTO_INTERNAL;
|
|
}
|
|
|
|
civ = find_iv(data, num_data, KRB5_CRYPTO_TYPE_CHECKSUM);
|
|
if (civ == NULL)
|
|
return KRB5_BAD_MSIZE;
|
|
|
|
len = 0;
|
|
for (i = 0; i < num_data; i++) {
|
|
if (data[i].flags != KRB5_CRYPTO_TYPE_DATA &&
|
|
data[i].flags != KRB5_CRYPTO_TYPE_SIGN_ONLY)
|
|
continue;
|
|
len += data[i].data.length;
|
|
}
|
|
|
|
p = q = malloc(len);
|
|
|
|
for (i = 0; i < num_data; i++) {
|
|
if (data[i].flags != KRB5_CRYPTO_TYPE_DATA &&
|
|
data[i].flags != KRB5_CRYPTO_TYPE_SIGN_ONLY)
|
|
continue;
|
|
memcpy(q, data[i].data.data, data[i].data.length);
|
|
q += data[i].data.length;
|
|
}
|
|
|
|
cksum.cksumtype = CHECKSUMTYPE(et->keyed_checksum);
|
|
cksum.checksum.length = civ->data.length;
|
|
cksum.checksum.data = civ->data.data;
|
|
|
|
ret = krb5_verify_checksum(context, crypto, usage, p, len, &cksum);
|
|
free(p);
|
|
|
|
if (ret == 0 && type)
|
|
*type = cksum.cksumtype;
|
|
|
|
return ret;
|
|
}
|
|
|
|
|
|
krb5_error_code KRB5_LIB_FUNCTION
|
|
krb5_crypto_length(krb5_context context,
|
|
krb5_crypto crypto,
|
|
int type,
|
|
size_t *len)
|
|
{
|
|
if (!derived_crypto(context, crypto)) {
|
|
krb5_set_error_message(context, EINVAL, "not a derived crypto");
|
|
return EINVAL;
|
|
}
|
|
|
|
switch(type) {
|
|
case KRB5_CRYPTO_TYPE_EMPTY:
|
|
*len = 0;
|
|
return 0;
|
|
case KRB5_CRYPTO_TYPE_HEADER:
|
|
*len = crypto->et->blocksize;
|
|
return 0;
|
|
case KRB5_CRYPTO_TYPE_DATA:
|
|
case KRB5_CRYPTO_TYPE_SIGN_ONLY:
|
|
/* len must already been filled in */
|
|
return 0;
|
|
case KRB5_CRYPTO_TYPE_PADDING:
|
|
if (crypto->et->padsize > 1)
|
|
*len = crypto->et->padsize;
|
|
else
|
|
*len = 0;
|
|
return 0;
|
|
case KRB5_CRYPTO_TYPE_TRAILER:
|
|
*len = CHECKSUMSIZE(crypto->et->keyed_checksum);
|
|
return 0;
|
|
case KRB5_CRYPTO_TYPE_CHECKSUM:
|
|
if (crypto->et->keyed_checksum)
|
|
*len = CHECKSUMSIZE(crypto->et->keyed_checksum);
|
|
else
|
|
*len = CHECKSUMSIZE(crypto->et->checksum);
|
|
return 0;
|
|
}
|
|
krb5_set_error_message(context, EINVAL,
|
|
"%d not a supported type", type);
|
|
return EINVAL;
|
|
}
|
|
|
|
|
|
krb5_error_code KRB5_LIB_FUNCTION
|
|
krb5_crypto_length_iov(krb5_context context,
|
|
krb5_crypto crypto,
|
|
krb5_crypto_iov *data,
|
|
unsigned int num_data)
|
|
{
|
|
krb5_error_code ret;
|
|
int i;
|
|
|
|
for (i = 0; i < num_data; i++) {
|
|
ret = krb5_crypto_length(context, crypto,
|
|
data[i].flags,
|
|
&data[i].data.length);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
krb5_error_code KRB5_LIB_FUNCTION
|
|
krb5_encrypt_ivec(krb5_context context,
|
|
krb5_crypto crypto,
|
|
unsigned usage,
|
|
const void *data,
|
|
size_t len,
|
|
krb5_data *result,
|
|
void *ivec)
|
|
{
|
|
if(derived_crypto(context, crypto))
|
|
return encrypt_internal_derived(context, crypto, usage,
|
|
data, len, result, ivec);
|
|
else if (special_crypto(context, crypto))
|
|
return encrypt_internal_special (context, crypto, usage,
|
|
data, len, result, ivec);
|
|
else
|
|
return encrypt_internal(context, crypto, data, len, result, ivec);
|
|
}
|
|
|
|
krb5_error_code KRB5_LIB_FUNCTION
|
|
krb5_encrypt(krb5_context context,
|
|
krb5_crypto crypto,
|
|
unsigned usage,
|
|
const void *data,
|
|
size_t len,
|
|
krb5_data *result)
|
|
{
|
|
return krb5_encrypt_ivec(context, crypto, usage, data, len, result, NULL);
|
|
}
|
|
|
|
krb5_error_code KRB5_LIB_FUNCTION
|
|
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_LIB_FUNCTION
|
|
krb5_decrypt_ivec(krb5_context context,
|
|
krb5_crypto crypto,
|
|
unsigned usage,
|
|
void *data,
|
|
size_t len,
|
|
krb5_data *result,
|
|
void *ivec)
|
|
{
|
|
if(derived_crypto(context, crypto))
|
|
return decrypt_internal_derived(context, crypto, usage,
|
|
data, len, result, ivec);
|
|
else if (special_crypto (context, crypto))
|
|
return decrypt_internal_special(context, crypto, usage,
|
|
data, len, result, ivec);
|
|
else
|
|
return decrypt_internal(context, crypto, data, len, result, ivec);
|
|
}
|
|
|
|
krb5_error_code KRB5_LIB_FUNCTION
|
|
krb5_decrypt(krb5_context context,
|
|
krb5_crypto crypto,
|
|
unsigned usage,
|
|
void *data,
|
|
size_t len,
|
|
krb5_data *result)
|
|
{
|
|
return krb5_decrypt_ivec (context, crypto, usage, data, len, result,
|
|
NULL);
|
|
}
|
|
|
|
krb5_error_code KRB5_LIB_FUNCTION
|
|
krb5_decrypt_EncryptedData(krb5_context context,
|
|
krb5_crypto crypto,
|
|
unsigned usage,
|
|
const EncryptedData *e,
|
|
krb5_data *result)
|
|
{
|
|
return krb5_decrypt(context, crypto, usage,
|
|
e->cipher.data, e->cipher.length, result);
|
|
}
|
|
|
|
/************************************************************
|
|
* *
|
|
************************************************************/
|
|
|
|
#define ENTROPY_NEEDED 128
|
|
|
|
static int
|
|
seed_something(void)
|
|
{
|
|
char buf[1024], seedfile[256];
|
|
|
|
/* If there is a seed file, load it. But such a file cannot be trusted,
|
|
so use 0 for the entropy estimate */
|
|
if (RAND_file_name(seedfile, sizeof(seedfile))) {
|
|
int fd;
|
|
fd = open(seedfile, O_RDONLY | O_BINARY | O_CLOEXEC);
|
|
if (fd >= 0) {
|
|
ssize_t ret;
|
|
rk_cloexec(fd);
|
|
ret = read(fd, buf, sizeof(buf));
|
|
if (ret > 0)
|
|
RAND_add(buf, ret, 0.0);
|
|
close(fd);
|
|
} else
|
|
seedfile[0] = '\0';
|
|
} else
|
|
seedfile[0] = '\0';
|
|
|
|
/* Calling RAND_status() will try to use /dev/urandom if it exists so
|
|
we do not have to deal with it. */
|
|
if (RAND_status() != 1) {
|
|
krb5_context context;
|
|
const char *p;
|
|
|
|
/* Try using egd */
|
|
if (!krb5_init_context(&context)) {
|
|
p = krb5_config_get_string(context, NULL, "libdefaults",
|
|
"egd_socket", NULL);
|
|
if (p != NULL)
|
|
RAND_egd_bytes(p, ENTROPY_NEEDED);
|
|
krb5_free_context(context);
|
|
}
|
|
}
|
|
|
|
if (RAND_status() == 1) {
|
|
/* Update the seed file */
|
|
if (seedfile[0])
|
|
RAND_write_file(seedfile);
|
|
|
|
return 0;
|
|
} else
|
|
return -1;
|
|
}
|
|
|
|
void KRB5_LIB_FUNCTION
|
|
krb5_generate_random_block(void *buf, size_t len)
|
|
{
|
|
static int rng_initialized = 0;
|
|
|
|
HEIMDAL_MUTEX_lock(&crypto_mutex);
|
|
if (!rng_initialized) {
|
|
if (seed_something())
|
|
krb5_abortx(NULL, "Fatal: could not seed the "
|
|
"random number generator");
|
|
|
|
rng_initialized = 1;
|
|
}
|
|
HEIMDAL_MUTEX_unlock(&crypto_mutex);
|
|
if (RAND_bytes(buf, len) != 1)
|
|
krb5_abortx(NULL, "Failed to generate random block");
|
|
}
|
|
|
|
static krb5_error_code
|
|
derive_key(krb5_context context,
|
|
struct encryption_type *et,
|
|
struct key_data *key,
|
|
const void *constant,
|
|
size_t len)
|
|
{
|
|
unsigned char *k = NULL;
|
|
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) {
|
|
ret = ENOMEM;
|
|
krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
|
|
goto out;
|
|
}
|
|
ret = _krb5_n_fold(constant, len, k, et->blocksize);
|
|
if (ret) {
|
|
krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
|
|
goto out;
|
|
}
|
|
|
|
for(i = 0; i < nblocks; i++) {
|
|
if(i > 0)
|
|
memcpy(k + i * et->blocksize,
|
|
k + (i - 1) * et->blocksize,
|
|
et->blocksize);
|
|
(*et->encrypt)(context, key, k + i * et->blocksize, et->blocksize,
|
|
1, 0, NULL);
|
|
}
|
|
} else {
|
|
/* this case is probably broken, but won't be run anyway */
|
|
void *c = malloc(len);
|
|
size_t res_len = (kt->bits + 7) / 8;
|
|
|
|
if(len != 0 && c == NULL) {
|
|
ret = ENOMEM;
|
|
krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
|
|
goto out;
|
|
}
|
|
memcpy(c, constant, len);
|
|
(*et->encrypt)(context, key, c, len, 1, 0, NULL);
|
|
k = malloc(res_len);
|
|
if(res_len != 0 && k == NULL) {
|
|
free(c);
|
|
ret = ENOMEM;
|
|
krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
|
|
goto out;
|
|
}
|
|
ret = _krb5_n_fold(c, len, k, res_len);
|
|
free(c);
|
|
if (ret) {
|
|
krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
/* XXX keytype dependent post-processing */
|
|
switch(kt->type) {
|
|
case KEYTYPE_DES3:
|
|
DES3_random_to_key(context, key->key, k, nblocks * et->blocksize);
|
|
break;
|
|
case KEYTYPE_AES128:
|
|
case KEYTYPE_AES256:
|
|
memcpy(key->key->keyvalue.data, k, key->key->keyvalue.length);
|
|
break;
|
|
default:
|
|
ret = KRB5_CRYPTO_INTERNAL;
|
|
krb5_set_error_message(context, ret,
|
|
N_("derive_key() called with unknown keytype (%u)", ""),
|
|
kt->type);
|
|
break;
|
|
}
|
|
out:
|
|
if (key->schedule) {
|
|
free_key_schedule(context, key, et);
|
|
key->schedule = NULL;
|
|
}
|
|
if (k) {
|
|
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;
|
|
}
|
|
|
|
krb5_error_code KRB5_LIB_FUNCTION
|
|
krb5_derive_key(krb5_context context,
|
|
const krb5_keyblock *key,
|
|
krb5_enctype etype,
|
|
const void *constant,
|
|
size_t constant_len,
|
|
krb5_keyblock **derived_key)
|
|
{
|
|
krb5_error_code ret;
|
|
struct encryption_type *et;
|
|
struct key_data d;
|
|
|
|
*derived_key = NULL;
|
|
|
|
et = _find_enctype (etype);
|
|
if (et == NULL) {
|
|
krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
|
|
N_("encryption type %d not supported", ""),
|
|
etype);
|
|
return KRB5_PROG_ETYPE_NOSUPP;
|
|
}
|
|
|
|
ret = krb5_copy_keyblock(context, key, &d.key);
|
|
if (ret)
|
|
return ret;
|
|
|
|
d.schedule = NULL;
|
|
ret = derive_key(context, et, &d, constant, constant_len);
|
|
if (ret == 0)
|
|
ret = krb5_copy_keyblock(context, d.key, derived_key);
|
|
free_key_data(context, &d, et);
|
|
return ret;
|
|
}
|
|
|
|
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) {
|
|
krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* Create a crypto context used for all encryption and signature
|
|
* operation. The encryption type to use is taken from the key, but
|
|
* can be overridden with the enctype parameter. This can be useful
|
|
* for encryptions types which is compatiable (DES for example).
|
|
*
|
|
* To free the crypto context, use krb5_crypto_destroy().
|
|
*
|
|
* @param context Kerberos context
|
|
* @param key the key block information with all key data
|
|
* @param etype the encryption type
|
|
* @param crypto the resulting crypto context
|
|
*
|
|
* @return Return an error code or 0.
|
|
*
|
|
* @ingroup krb5_crypto
|
|
*/
|
|
|
|
krb5_error_code KRB5_LIB_FUNCTION
|
|
krb5_crypto_init(krb5_context context,
|
|
const krb5_keyblock *key,
|
|
krb5_enctype etype,
|
|
krb5_crypto *crypto)
|
|
{
|
|
krb5_error_code ret;
|
|
ALLOC(*crypto, 1);
|
|
if(*crypto == NULL) {
|
|
krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
|
|
return ENOMEM;
|
|
}
|
|
if(etype == ETYPE_NULL)
|
|
etype = key->keytype;
|
|
(*crypto)->et = _find_enctype(etype);
|
|
if((*crypto)->et == NULL || ((*crypto)->et->flags & F_DISABLED)) {
|
|
free(*crypto);
|
|
*crypto = NULL;
|
|
krb5_set_error_message (context, KRB5_PROG_ETYPE_NOSUPP,
|
|
N_("encryption type %d not supported", ""),
|
|
etype);
|
|
return KRB5_PROG_ETYPE_NOSUPP;
|
|
}
|
|
if((*crypto)->et->keytype->size != key->keyvalue.length) {
|
|
free(*crypto);
|
|
*crypto = NULL;
|
|
krb5_set_error_message (context, KRB5_BAD_KEYSIZE,
|
|
"encryption key has bad length");
|
|
return KRB5_BAD_KEYSIZE;
|
|
}
|
|
ret = krb5_copy_keyblock(context, key, &(*crypto)->key.key);
|
|
if(ret) {
|
|
free(*crypto);
|
|
*crypto = NULL;
|
|
return ret;
|
|
}
|
|
(*crypto)->key.schedule = NULL;
|
|
(*crypto)->num_key_usage = 0;
|
|
(*crypto)->key_usage = NULL;
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
free_key_schedule(krb5_context context,
|
|
struct key_data *key,
|
|
struct encryption_type *et)
|
|
{
|
|
if (et->keytype->cleanup)
|
|
(*et->keytype->cleanup)(context, key);
|
|
memset(key->schedule->data, 0, key->schedule->length);
|
|
krb5_free_data(context, key->schedule);
|
|
}
|
|
|
|
static void
|
|
free_key_data(krb5_context context, struct key_data *key,
|
|
struct encryption_type *et)
|
|
{
|
|
krb5_free_keyblock(context, key->key);
|
|
if(key->schedule) {
|
|
free_key_schedule(context, key, et);
|
|
key->schedule = NULL;
|
|
}
|
|
}
|
|
|
|
static void
|
|
free_key_usage(krb5_context context, struct key_usage *ku,
|
|
struct encryption_type *et)
|
|
{
|
|
free_key_data(context, &ku->key, et);
|
|
}
|
|
|
|
/**
|
|
* Free a crypto context created by krb5_crypto_init().
|
|
*
|
|
* @param context Kerberos context
|
|
* @param crypto crypto context to free
|
|
*
|
|
* @return Return an error code or 0.
|
|
*
|
|
* @ingroup krb5_crypto
|
|
*/
|
|
|
|
krb5_error_code KRB5_LIB_FUNCTION
|
|
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], crypto->et);
|
|
free(crypto->key_usage);
|
|
free_key_data(context, &crypto->key, crypto->et);
|
|
free (crypto);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Return the blocksize used algorithm referenced by the crypto context
|
|
*
|
|
* @param context Kerberos context
|
|
* @param crypto crypto context to query
|
|
* @param blocksize the resulting blocksize
|
|
*
|
|
* @return Return an error code or 0.
|
|
*
|
|
* @ingroup krb5_crypto
|
|
*/
|
|
|
|
krb5_error_code KRB5_LIB_FUNCTION
|
|
krb5_crypto_getblocksize(krb5_context context,
|
|
krb5_crypto crypto,
|
|
size_t *blocksize)
|
|
{
|
|
*blocksize = crypto->et->blocksize;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Return the encryption type used by the crypto context
|
|
*
|
|
* @param context Kerberos context
|
|
* @param crypto crypto context to query
|
|
* @param enctype the resulting encryption type
|
|
*
|
|
* @return Return an error code or 0.
|
|
*
|
|
* @ingroup krb5_crypto
|
|
*/
|
|
|
|
krb5_error_code KRB5_LIB_FUNCTION
|
|
krb5_crypto_getenctype(krb5_context context,
|
|
krb5_crypto crypto,
|
|
krb5_enctype *enctype)
|
|
{
|
|
*enctype = crypto->et->type;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Return the padding size used by the crypto context
|
|
*
|
|
* @param context Kerberos context
|
|
* @param crypto crypto context to query
|
|
* @param padsize the return padding size
|
|
*
|
|
* @return Return an error code or 0.
|
|
*
|
|
* @ingroup krb5_crypto
|
|
*/
|
|
|
|
krb5_error_code KRB5_LIB_FUNCTION
|
|
krb5_crypto_getpadsize(krb5_context context,
|
|
krb5_crypto crypto,
|
|
size_t *padsize)
|
|
{
|
|
*padsize = crypto->et->padsize;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Return the confounder size used by the crypto context
|
|
*
|
|
* @param context Kerberos context
|
|
* @param crypto crypto context to query
|
|
* @param confoundersize the returned confounder size
|
|
*
|
|
* @return Return an error code or 0.
|
|
*
|
|
* @ingroup krb5_crypto
|
|
*/
|
|
|
|
krb5_error_code KRB5_LIB_FUNCTION
|
|
krb5_crypto_getconfoundersize(krb5_context context,
|
|
krb5_crypto crypto,
|
|
size_t *confoundersize)
|
|
{
|
|
*confoundersize = crypto->et->confoundersize;
|
|
return 0;
|
|
}
|
|
|
|
|
|
/**
|
|
* Disable encryption type
|
|
*
|
|
* @param context Kerberos 5 context
|
|
* @param enctype encryption type to disable
|
|
*
|
|
* @return Return an error code or 0.
|
|
*
|
|
* @ingroup krb5_crypto
|
|
*/
|
|
|
|
krb5_error_code KRB5_LIB_FUNCTION
|
|
krb5_enctype_disable(krb5_context context,
|
|
krb5_enctype enctype)
|
|
{
|
|
struct encryption_type *et = _find_enctype(enctype);
|
|
if(et == NULL) {
|
|
if (context)
|
|
krb5_set_error_message (context, KRB5_PROG_ETYPE_NOSUPP,
|
|
N_("encryption type %d not supported", ""),
|
|
enctype);
|
|
return KRB5_PROG_ETYPE_NOSUPP;
|
|
}
|
|
et->flags |= F_DISABLED;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Enable encryption type
|
|
*
|
|
* @param context Kerberos 5 context
|
|
* @param enctype encryption type to enable
|
|
*
|
|
* @return Return an error code or 0.
|
|
*
|
|
* @ingroup krb5_crypto
|
|
*/
|
|
|
|
krb5_error_code KRB5_LIB_FUNCTION
|
|
krb5_enctype_enable(krb5_context context,
|
|
krb5_enctype enctype)
|
|
{
|
|
struct encryption_type *et = _find_enctype(enctype);
|
|
if(et == NULL) {
|
|
if (context)
|
|
krb5_set_error_message (context, KRB5_PROG_ETYPE_NOSUPP,
|
|
N_("encryption type %d not supported", ""),
|
|
enctype);
|
|
return KRB5_PROG_ETYPE_NOSUPP;
|
|
}
|
|
et->flags &= ~F_DISABLED;
|
|
return 0;
|
|
}
|
|
|
|
|
|
krb5_error_code KRB5_LIB_FUNCTION
|
|
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;
|
|
size_t keylen;
|
|
u_char *tmp;
|
|
|
|
if(et == NULL) {
|
|
krb5_set_error_message (context, KRB5_PROG_ETYPE_NOSUPP,
|
|
N_("encryption type %d not supported", ""),
|
|
etype);
|
|
return KRB5_PROG_ETYPE_NOSUPP;
|
|
}
|
|
keylen = et->keytype->bits / 8;
|
|
|
|
ALLOC(kd.key, 1);
|
|
if(kd.key == NULL) {
|
|
krb5_set_error_message (context, ENOMEM,
|
|
N_("malloc: out of memory", ""));
|
|
return ENOMEM;
|
|
}
|
|
ret = krb5_data_alloc(&kd.key->keyvalue, et->keytype->size);
|
|
if(ret) {
|
|
free(kd.key);
|
|
return ret;
|
|
}
|
|
kd.key->keytype = etype;
|
|
tmp = malloc (keylen);
|
|
if(tmp == NULL) {
|
|
krb5_free_keyblock(context, kd.key);
|
|
krb5_set_error_message (context, ENOMEM, N_("malloc: out of memory", ""));
|
|
return ENOMEM;
|
|
}
|
|
ret = _krb5_n_fold(str, len, tmp, keylen);
|
|
if (ret) {
|
|
free(tmp);
|
|
krb5_set_error_message (context, ENOMEM, N_("malloc: out of memory", ""));
|
|
return ret;
|
|
}
|
|
kd.schedule = NULL;
|
|
DES3_random_to_key(context, kd.key, tmp, keylen);
|
|
memset(tmp, 0, keylen);
|
|
free(tmp);
|
|
ret = derive_key(context,
|
|
et,
|
|
&kd,
|
|
"kerberos", /* XXX well known constant */
|
|
strlen("kerberos"));
|
|
if (ret) {
|
|
free_key_data(context, &kd, et);
|
|
return ret;
|
|
}
|
|
ret = krb5_copy_keyblock_contents(context, kd.key, key);
|
|
free_key_data(context, &kd, et);
|
|
return ret;
|
|
}
|
|
|
|
static size_t
|
|
wrapped_length (krb5_context context,
|
|
krb5_crypto crypto,
|
|
size_t data_len)
|
|
{
|
|
struct encryption_type *et = crypto->et;
|
|
size_t padsize = et->padsize;
|
|
size_t checksumsize = CHECKSUMSIZE(et->checksum);
|
|
size_t res;
|
|
|
|
res = et->confoundersize + checksumsize + data_len;
|
|
res = (res + padsize - 1) / padsize * padsize;
|
|
return res;
|
|
}
|
|
|
|
static size_t
|
|
wrapped_length_dervied (krb5_context context,
|
|
krb5_crypto crypto,
|
|
size_t data_len)
|
|
{
|
|
struct encryption_type *et = crypto->et;
|
|
size_t padsize = et->padsize;
|
|
size_t res;
|
|
|
|
res = et->confoundersize + data_len;
|
|
res = (res + padsize - 1) / padsize * padsize;
|
|
if (et->keyed_checksum)
|
|
res += et->keyed_checksum->checksumsize;
|
|
else
|
|
res += et->checksum->checksumsize;
|
|
return res;
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
if (derived_crypto (context, crypto))
|
|
return wrapped_length_dervied (context, crypto, data_len);
|
|
else
|
|
return wrapped_length (context, crypto, data_len);
|
|
}
|
|
|
|
/*
|
|
* Return the size of an encrypted packet of length `data_len'
|
|
*/
|
|
|
|
static size_t
|
|
crypto_overhead (krb5_context context,
|
|
krb5_crypto crypto)
|
|
{
|
|
struct encryption_type *et = crypto->et;
|
|
size_t res;
|
|
|
|
res = CHECKSUMSIZE(et->checksum);
|
|
res += et->confoundersize;
|
|
if (et->padsize > 1)
|
|
res += et->padsize;
|
|
return res;
|
|
}
|
|
|
|
static size_t
|
|
crypto_overhead_dervied (krb5_context context,
|
|
krb5_crypto crypto)
|
|
{
|
|
struct encryption_type *et = crypto->et;
|
|
size_t res;
|
|
|
|
if (et->keyed_checksum)
|
|
res = CHECKSUMSIZE(et->keyed_checksum);
|
|
else
|
|
res = CHECKSUMSIZE(et->checksum);
|
|
res += et->confoundersize;
|
|
if (et->padsize > 1)
|
|
res += et->padsize;
|
|
return res;
|
|
}
|
|
|
|
size_t
|
|
krb5_crypto_overhead (krb5_context context, krb5_crypto crypto)
|
|
{
|
|
if (derived_crypto (context, crypto))
|
|
return crypto_overhead_dervied (context, crypto);
|
|
else
|
|
return crypto_overhead (context, crypto);
|
|
}
|
|
|
|
/**
|
|
* Converts the random bytestring to a protocol key according to
|
|
* Kerberos crypto frame work. It may be assumed that all the bits of
|
|
* the input string are equally random, even though the entropy
|
|
* present in the random source may be limited.
|
|
*
|
|
* @param context Kerberos 5 context
|
|
* @param type the enctype resulting key will be of
|
|
* @param data input random data to convert to a key
|
|
* @param size size of input random data, at least krb5_enctype_keysize() long
|
|
* @param key key, output key, free with krb5_free_keyblock_contents()
|
|
*
|
|
* @return Return an error code or 0.
|
|
*
|
|
* @ingroup krb5_crypto
|
|
*/
|
|
|
|
krb5_error_code KRB5_LIB_FUNCTION
|
|
krb5_random_to_key(krb5_context context,
|
|
krb5_enctype type,
|
|
const void *data,
|
|
size_t size,
|
|
krb5_keyblock *key)
|
|
{
|
|
krb5_error_code ret;
|
|
struct encryption_type *et = _find_enctype(type);
|
|
if(et == NULL) {
|
|
krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
|
|
N_("encryption type %d not supported", ""),
|
|
type);
|
|
return KRB5_PROG_ETYPE_NOSUPP;
|
|
}
|
|
if ((et->keytype->bits + 7) / 8 > size) {
|
|
krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
|
|
N_("encryption key %s needs %d bytes "
|
|
"of random to make an encryption key "
|
|
"out of it", ""),
|
|
et->name, (int)et->keytype->size);
|
|
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_to_key)
|
|
(*et->keytype->random_to_key)(context, key, data, size);
|
|
else
|
|
memcpy(key->keyvalue.data, data, et->keytype->size);
|
|
|
|
return 0;
|
|
}
|
|
|
|
krb5_error_code
|
|
_krb5_pk_octetstring2key(krb5_context context,
|
|
krb5_enctype type,
|
|
const void *dhdata,
|
|
size_t dhsize,
|
|
const heim_octet_string *c_n,
|
|
const heim_octet_string *k_n,
|
|
krb5_keyblock *key)
|
|
{
|
|
struct encryption_type *et = _find_enctype(type);
|
|
krb5_error_code ret;
|
|
size_t keylen, offset;
|
|
void *keydata;
|
|
unsigned char counter;
|
|
unsigned char shaoutput[SHA_DIGEST_LENGTH];
|
|
EVP_MD_CTX *m;
|
|
|
|
if(et == NULL) {
|
|
krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
|
|
N_("encryption type %d not supported", ""),
|
|
type);
|
|
return KRB5_PROG_ETYPE_NOSUPP;
|
|
}
|
|
keylen = (et->keytype->bits + 7) / 8;
|
|
|
|
keydata = malloc(keylen);
|
|
if (keydata == NULL) {
|
|
krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
|
|
return ENOMEM;
|
|
}
|
|
|
|
m = EVP_MD_CTX_create();
|
|
if (m == NULL) {
|
|
free(keydata);
|
|
krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
|
|
return ENOMEM;
|
|
}
|
|
|
|
counter = 0;
|
|
offset = 0;
|
|
do {
|
|
|
|
EVP_DigestInit_ex(m, EVP_sha1(), NULL);
|
|
EVP_DigestUpdate(m, &counter, 1);
|
|
EVP_DigestUpdate(m, dhdata, dhsize);
|
|
|
|
if (c_n)
|
|
EVP_DigestUpdate(m, c_n->data, c_n->length);
|
|
if (k_n)
|
|
EVP_DigestUpdate(m, k_n->data, k_n->length);
|
|
|
|
EVP_DigestFinal_ex(m, shaoutput, NULL);
|
|
|
|
memcpy((unsigned char *)keydata + offset,
|
|
shaoutput,
|
|
min(keylen - offset, sizeof(shaoutput)));
|
|
|
|
offset += sizeof(shaoutput);
|
|
counter++;
|
|
} while(offset < keylen);
|
|
memset(shaoutput, 0, sizeof(shaoutput));
|
|
|
|
EVP_MD_CTX_destroy(m);
|
|
|
|
ret = krb5_random_to_key(context, type, keydata, keylen, key);
|
|
memset(keydata, 0, sizeof(keylen));
|
|
free(keydata);
|
|
return ret;
|
|
}
|
|
|
|
static krb5_error_code
|
|
encode_uvinfo(krb5_context context, krb5_const_principal p, krb5_data *data)
|
|
{
|
|
KRB5PrincipalName pn;
|
|
krb5_error_code ret;
|
|
size_t size;
|
|
|
|
pn.principalName = p->name;
|
|
pn.realm = p->realm;
|
|
|
|
ASN1_MALLOC_ENCODE(KRB5PrincipalName, data->data, data->length,
|
|
&pn, &size, ret);
|
|
if (ret) {
|
|
krb5_data_zero(data);
|
|
krb5_set_error_message(context, ret,
|
|
N_("Failed to encode KRB5PrincipalName", ""));
|
|
return ret;
|
|
}
|
|
if (data->length != size)
|
|
krb5_abortx(context, "asn1 compiler internal error");
|
|
return 0;
|
|
}
|
|
|
|
static krb5_error_code
|
|
encode_otherinfo(krb5_context context,
|
|
const AlgorithmIdentifier *ai,
|
|
krb5_const_principal client,
|
|
krb5_const_principal server,
|
|
krb5_enctype enctype,
|
|
const krb5_data *as_req,
|
|
const krb5_data *pk_as_rep,
|
|
const Ticket *ticket,
|
|
krb5_data *other)
|
|
{
|
|
PkinitSP80056AOtherInfo otherinfo;
|
|
PkinitSuppPubInfo pubinfo;
|
|
krb5_error_code ret;
|
|
krb5_data pub;
|
|
size_t size;
|
|
|
|
krb5_data_zero(other);
|
|
memset(&otherinfo, 0, sizeof(otherinfo));
|
|
memset(&pubinfo, 0, sizeof(pubinfo));
|
|
|
|
pubinfo.enctype = enctype;
|
|
pubinfo.as_REQ = *as_req;
|
|
pubinfo.pk_as_rep = *pk_as_rep;
|
|
pubinfo.ticket = *ticket;
|
|
ASN1_MALLOC_ENCODE(PkinitSuppPubInfo, pub.data, pub.length,
|
|
&pubinfo, &size, ret);
|
|
if (ret) {
|
|
krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
|
|
return ret;
|
|
}
|
|
if (pub.length != size)
|
|
krb5_abortx(context, "asn1 compiler internal error");
|
|
|
|
ret = encode_uvinfo(context, client, &otherinfo.partyUInfo);
|
|
if (ret) {
|
|
free(pub.data);
|
|
return ret;
|
|
}
|
|
ret = encode_uvinfo(context, server, &otherinfo.partyVInfo);
|
|
if (ret) {
|
|
free(otherinfo.partyUInfo.data);
|
|
free(pub.data);
|
|
return ret;
|
|
}
|
|
|
|
otherinfo.algorithmID = *ai;
|
|
otherinfo.suppPubInfo = &pub;
|
|
|
|
ASN1_MALLOC_ENCODE(PkinitSP80056AOtherInfo, other->data, other->length,
|
|
&otherinfo, &size, ret);
|
|
free(otherinfo.partyUInfo.data);
|
|
free(otherinfo.partyVInfo.data);
|
|
free(pub.data);
|
|
if (ret) {
|
|
krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
|
|
return ret;
|
|
}
|
|
if (other->length != size)
|
|
krb5_abortx(context, "asn1 compiler internal error");
|
|
|
|
return 0;
|
|
}
|
|
|
|
krb5_error_code
|
|
_krb5_pk_kdf(krb5_context context,
|
|
const struct AlgorithmIdentifier *ai,
|
|
const void *dhdata,
|
|
size_t dhsize,
|
|
krb5_const_principal client,
|
|
krb5_const_principal server,
|
|
krb5_enctype enctype,
|
|
const krb5_data *as_req,
|
|
const krb5_data *pk_as_rep,
|
|
const Ticket *ticket,
|
|
krb5_keyblock *key)
|
|
{
|
|
struct encryption_type *et;
|
|
krb5_error_code ret;
|
|
krb5_data other;
|
|
size_t keylen, offset;
|
|
uint32_t counter;
|
|
unsigned char *keydata;
|
|
unsigned char shaoutput[SHA_DIGEST_LENGTH];
|
|
EVP_MD_CTX *m;
|
|
|
|
if (der_heim_oid_cmp(&asn1_oid_id_pkinit_kdf_ah_sha1, &ai->algorithm) != 0) {
|
|
krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
|
|
N_("KDF not supported", ""));
|
|
return KRB5_PROG_ETYPE_NOSUPP;
|
|
}
|
|
if (ai->parameters != NULL &&
|
|
(ai->parameters->length != 2 ||
|
|
memcmp(ai->parameters->data, "\x05\x00", 2) != 0))
|
|
{
|
|
krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
|
|
N_("kdf params not NULL or the NULL-type",
|
|
""));
|
|
return KRB5_PROG_ETYPE_NOSUPP;
|
|
}
|
|
|
|
et = _find_enctype(enctype);
|
|
if(et == NULL) {
|
|
krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
|
|
N_("encryption type %d not supported", ""),
|
|
enctype);
|
|
return KRB5_PROG_ETYPE_NOSUPP;
|
|
}
|
|
keylen = (et->keytype->bits + 7) / 8;
|
|
|
|
keydata = malloc(keylen);
|
|
if (keydata == NULL) {
|
|
krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
|
|
return ENOMEM;
|
|
}
|
|
|
|
ret = encode_otherinfo(context, ai, client, server,
|
|
enctype, as_req, pk_as_rep, ticket, &other);
|
|
if (ret) {
|
|
free(keydata);
|
|
return ret;
|
|
}
|
|
|
|
m = EVP_MD_CTX_create();
|
|
if (m == NULL) {
|
|
free(keydata);
|
|
free(other.data);
|
|
krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
|
|
return ENOMEM;
|
|
}
|
|
|
|
offset = 0;
|
|
counter = 1;
|
|
do {
|
|
unsigned char cdata[4];
|
|
|
|
EVP_DigestInit_ex(m, EVP_sha1(), NULL);
|
|
_krb5_put_int(cdata, counter, 4);
|
|
EVP_DigestUpdate(m, cdata, 4);
|
|
EVP_DigestUpdate(m, dhdata, dhsize);
|
|
EVP_DigestUpdate(m, other.data, other.length);
|
|
|
|
EVP_DigestFinal_ex(m, shaoutput, NULL);
|
|
|
|
memcpy((unsigned char *)keydata + offset,
|
|
shaoutput,
|
|
min(keylen - offset, sizeof(shaoutput)));
|
|
|
|
offset += sizeof(shaoutput);
|
|
counter++;
|
|
} while(offset < keylen);
|
|
memset(shaoutput, 0, sizeof(shaoutput));
|
|
|
|
EVP_MD_CTX_destroy(m);
|
|
free(other.data);
|
|
|
|
ret = krb5_random_to_key(context, enctype, keydata, keylen, key);
|
|
memset(keydata, 0, sizeof(keylen));
|
|
free(keydata);
|
|
|
|
return ret;
|
|
}
|
|
|
|
|
|
krb5_error_code KRB5_LIB_FUNCTION
|
|
krb5_crypto_prf_length(krb5_context context,
|
|
krb5_enctype type,
|
|
size_t *length)
|
|
{
|
|
struct encryption_type *et = _find_enctype(type);
|
|
|
|
if(et == NULL || et->prf_length == 0) {
|
|
krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
|
|
N_("encryption type %d not supported", ""),
|
|
type);
|
|
return KRB5_PROG_ETYPE_NOSUPP;
|
|
}
|
|
|
|
*length = et->prf_length;
|
|
return 0;
|
|
}
|
|
|
|
krb5_error_code KRB5_LIB_FUNCTION
|
|
krb5_crypto_prf(krb5_context context,
|
|
const krb5_crypto crypto,
|
|
const krb5_data *input,
|
|
krb5_data *output)
|
|
{
|
|
struct encryption_type *et = crypto->et;
|
|
|
|
krb5_data_zero(output);
|
|
|
|
if(et->prf == NULL) {
|
|
krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
|
|
"kerberos prf for %s not supported",
|
|
et->name);
|
|
return KRB5_PROG_ETYPE_NOSUPP;
|
|
}
|
|
|
|
return (*et->prf)(context, crypto, input, output);
|
|
}
|
|
|
|
static krb5_error_code
|
|
krb5_crypto_prfplus(krb5_context context,
|
|
const krb5_crypto crypto,
|
|
const krb5_data *input,
|
|
size_t length,
|
|
krb5_data *output)
|
|
{
|
|
krb5_error_code ret;
|
|
krb5_data input2;
|
|
unsigned char i = 1;
|
|
unsigned char *p;
|
|
|
|
krb5_data_zero(&input2);
|
|
krb5_data_zero(output);
|
|
|
|
krb5_clear_error_message(context);
|
|
|
|
ret = krb5_data_alloc(output, length);
|
|
if (ret) goto out;
|
|
ret = krb5_data_alloc(&input2, input->length + 1);
|
|
if (ret) goto out;
|
|
|
|
krb5_clear_error_message(context);
|
|
|
|
memcpy(((unsigned char *)input2.data) + 1, input->data, input->length);
|
|
|
|
p = output->data;
|
|
|
|
while (length) {
|
|
krb5_data block;
|
|
|
|
((unsigned char *)input2.data)[0] = i++;
|
|
|
|
ret = krb5_crypto_prf(context, crypto, &input2, &block);
|
|
if (ret)
|
|
goto out;
|
|
|
|
if (block.length < length) {
|
|
memcpy(p, block.data, block.length);
|
|
length -= block.length;
|
|
} else {
|
|
memcpy(p, block.data, length);
|
|
length = 0;
|
|
}
|
|
p += block.length;
|
|
krb5_data_free(&block);
|
|
}
|
|
|
|
out:
|
|
krb5_data_free(&input2);
|
|
if (ret)
|
|
krb5_data_free(output);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* The FX-CF2 key derivation function, used in FAST and preauth framework.
|
|
*
|
|
* @param context Kerberos 5 context
|
|
* @param crypto1 first key to combine
|
|
* @param crypto2 second key to combine
|
|
* @param pepper1 factor to combine with first key to garante uniqueness
|
|
* @param pepper2 factor to combine with second key to garante uniqueness
|
|
* @param enctype the encryption type of the resulting key
|
|
* @param res allocated key, free with krb5_free_keyblock_contents()
|
|
*
|
|
* @return Return an error code or 0.
|
|
*
|
|
* @ingroup krb5_crypto
|
|
*/
|
|
|
|
krb5_error_code KRB5_LIB_FUNCTION
|
|
krb5_crypto_fx_cf2(krb5_context context,
|
|
const krb5_crypto crypto1,
|
|
const krb5_crypto crypto2,
|
|
krb5_data *pepper1,
|
|
krb5_data *pepper2,
|
|
krb5_enctype enctype,
|
|
krb5_keyblock *res)
|
|
{
|
|
krb5_error_code ret;
|
|
krb5_data os1, os2;
|
|
size_t i, keysize;
|
|
|
|
memset(res, 0, sizeof(*res));
|
|
|
|
ret = krb5_enctype_keysize(context, enctype, &keysize);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = krb5_data_alloc(&res->keyvalue, keysize);
|
|
if (ret)
|
|
goto out;
|
|
ret = krb5_crypto_prfplus(context, crypto1, pepper1, keysize, &os1);
|
|
if (ret)
|
|
goto out;
|
|
ret = krb5_crypto_prfplus(context, crypto2, pepper2, keysize, &os2);
|
|
if (ret)
|
|
goto out;
|
|
|
|
res->keytype = enctype;
|
|
{
|
|
unsigned char *p1 = os1.data, *p2 = os2.data, *p3 = res->keyvalue.data;
|
|
for (i = 0; i < keysize; i++)
|
|
p3[i] = p1[i] ^ p2[i];
|
|
}
|
|
out:
|
|
if (ret)
|
|
krb5_data_free(&res->keyvalue);
|
|
krb5_data_free(&os1);
|
|
krb5_data_free(&os2);
|
|
|
|
return ret;
|
|
}
|
|
|
|
|
|
|
|
#ifndef HEIMDAL_SMALLER
|
|
|
|
krb5_error_code KRB5_LIB_FUNCTION
|
|
krb5_keytype_to_enctypes (krb5_context context,
|
|
krb5_keytype keytype,
|
|
unsigned *len,
|
|
krb5_enctype **val)
|
|
KRB5_DEPRECATED
|
|
{
|
|
int i;
|
|
unsigned n = 0;
|
|
krb5_enctype *ret;
|
|
|
|
for (i = num_etypes - 1; i >= 0; --i) {
|
|
if (etypes[i]->keytype->type == keytype
|
|
&& !(etypes[i]->flags & F_PSEUDO)
|
|
&& krb5_enctype_valid(context, etypes[i]->type) == 0)
|
|
++n;
|
|
}
|
|
if (n == 0) {
|
|
krb5_set_error_message(context, KRB5_PROG_KEYTYPE_NOSUPP,
|
|
"Keytype have no mapping");
|
|
return KRB5_PROG_KEYTYPE_NOSUPP;
|
|
}
|
|
|
|
ret = malloc(n * sizeof(*ret));
|
|
if (ret == NULL && n != 0) {
|
|
krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
|
|
return ENOMEM;
|
|
}
|
|
n = 0;
|
|
for (i = num_etypes - 1; i >= 0; --i) {
|
|
if (etypes[i]->keytype->type == keytype
|
|
&& !(etypes[i]->flags & F_PSEUDO)
|
|
&& krb5_enctype_valid(context, etypes[i]->type) == 0)
|
|
ret[n++] = etypes[i]->type;
|
|
}
|
|
*len = n;
|
|
*val = ret;
|
|
return 0;
|
|
}
|
|
|
|
/* if two enctypes have compatible keys */
|
|
krb5_boolean KRB5_LIB_FUNCTION
|
|
krb5_enctypes_compatible_keys(krb5_context context,
|
|
krb5_enctype etype1,
|
|
krb5_enctype etype2)
|
|
KRB5_DEPRECATED
|
|
{
|
|
struct encryption_type *e1 = _find_enctype(etype1);
|
|
struct encryption_type *e2 = _find_enctype(etype2);
|
|
return e1 != NULL && e2 != NULL && e1->keytype == e2->keytype;
|
|
}
|
|
|
|
#endif /* HEIMDAL_SMALLER */
|