2651 lines
66 KiB
C
2651 lines
66 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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#include "krb5_locl.h"
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struct _krb5_key_usage {
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unsigned usage;
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struct _krb5_key_data key;
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};
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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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static krb5_error_code _get_derived_key(krb5_context, krb5_crypto,
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unsigned, struct _krb5_key_data**);
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static struct _krb5_key_data *_new_derived_key(krb5_crypto crypto, unsigned usage);
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static void free_key_schedule(krb5_context,
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struct _krb5_key_data *,
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struct _krb5_encryption_type *);
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/*
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* Converts etype to a user readable string and sets as a side effect
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* the krb5_error_message containing this string. Returns
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* KRB5_PROG_ETYPE_NOSUPP in not the conversion of the etype failed in
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* which case the error code of the etype convesion is returned.
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*/
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static krb5_error_code
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unsupported_enctype(krb5_context context, krb5_enctype etype)
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{
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krb5_error_code ret;
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char *name;
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ret = krb5_enctype_to_string(context, etype, &name);
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if (ret)
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return ret;
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krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
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N_("Encryption type %s not supported", ""),
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name);
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free(name);
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return KRB5_PROG_ETYPE_NOSUPP;
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}
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/*
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*
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*/
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KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
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krb5_enctype_keysize(krb5_context context,
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krb5_enctype type,
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size_t *keysize)
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{
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struct _krb5_encryption_type *et = _krb5_find_enctype(type);
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if(et == NULL) {
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return unsupported_enctype (context, type);
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}
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*keysize = et->keytype->size;
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return 0;
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}
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KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
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krb5_enctype_keybits(krb5_context context,
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krb5_enctype type,
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size_t *keybits)
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{
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struct _krb5_encryption_type *et = _krb5_find_enctype(type);
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if(et == NULL) {
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return unsupported_enctype (context, type);
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}
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*keybits = et->keytype->bits;
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return 0;
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}
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KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
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krb5_generate_random_keyblock(krb5_context context,
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krb5_enctype type,
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krb5_keyblock *key)
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{
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krb5_error_code ret;
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struct _krb5_encryption_type *et = _krb5_find_enctype(type);
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if(et == NULL) {
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return unsupported_enctype (context, type);
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}
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ret = krb5_data_alloc(&key->keyvalue, et->keytype->size);
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if(ret)
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return ret;
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key->keytype = type;
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if(et->keytype->random_key)
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(*et->keytype->random_key)(context, key);
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else
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krb5_generate_random_block(key->keyvalue.data,
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key->keyvalue.length);
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return 0;
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}
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static krb5_error_code
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_key_schedule(krb5_context context,
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struct _krb5_key_data *key)
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{
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krb5_error_code ret;
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struct _krb5_encryption_type *et = _krb5_find_enctype(key->key->keytype);
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struct _krb5_key_type *kt;
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if (et == NULL) {
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return unsupported_enctype (context,
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key->key->keytype);
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}
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kt = et->keytype;
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if(kt->schedule == NULL)
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return 0;
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if (key->schedule != NULL)
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return 0;
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ALLOC(key->schedule, 1);
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if(key->schedule == 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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ret = krb5_data_alloc(key->schedule, kt->schedule_size);
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if(ret) {
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free(key->schedule);
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key->schedule = NULL;
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return ret;
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}
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(*kt->schedule)(context, kt, key);
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return 0;
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}
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/************************************************************
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* *
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************************************************************/
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static krb5_error_code
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SHA1_checksum(krb5_context context,
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struct _krb5_key_data *key,
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const void *data,
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size_t len,
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unsigned usage,
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Checksum *C)
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{
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if (EVP_Digest(data, len, C->checksum.data, NULL, EVP_sha1(), NULL) != 1)
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krb5_abortx(context, "sha1 checksum failed");
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return 0;
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}
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/* HMAC according to RFC2104 */
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krb5_error_code
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_krb5_internal_hmac(krb5_context context,
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struct _krb5_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 _krb5_key_data *keyblock,
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Checksum *result)
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{
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unsigned char *ipad, *opad;
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unsigned char *key;
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size_t key_len;
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size_t i;
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ipad = malloc(cm->blocksize + len);
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if (ipad == NULL)
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return ENOMEM;
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opad = malloc(cm->blocksize + cm->checksumsize);
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if (opad == NULL) {
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free(ipad);
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return ENOMEM;
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}
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memset(ipad, 0x36, cm->blocksize);
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memset(opad, 0x5c, cm->blocksize);
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if(keyblock->key->keyvalue.length > cm->blocksize){
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(*cm->checksum)(context,
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keyblock,
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keyblock->key->keyvalue.data,
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keyblock->key->keyvalue.length,
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usage,
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result);
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key = result->checksum.data;
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key_len = result->checksum.length;
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} else {
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key = keyblock->key->keyvalue.data;
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key_len = keyblock->key->keyvalue.length;
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}
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for(i = 0; i < key_len; i++){
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ipad[i] ^= key[i];
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opad[i] ^= key[i];
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}
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memcpy(ipad + cm->blocksize, data, len);
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(*cm->checksum)(context, keyblock, ipad, cm->blocksize + len,
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usage, result);
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memcpy(opad + cm->blocksize, result->checksum.data,
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result->checksum.length);
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(*cm->checksum)(context, keyblock, opad,
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cm->blocksize + cm->checksumsize, usage, result);
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memset(ipad, 0, cm->blocksize + len);
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free(ipad);
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memset(opad, 0, cm->blocksize + cm->checksumsize);
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free(opad);
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return 0;
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}
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KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
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krb5_hmac(krb5_context context,
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krb5_cksumtype cktype,
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const void *data,
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size_t len,
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unsigned usage,
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krb5_keyblock *key,
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Checksum *result)
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{
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struct _krb5_checksum_type *c = _krb5_find_checksum(cktype);
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struct _krb5_key_data kd;
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krb5_error_code ret;
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if (c == NULL) {
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krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
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N_("checksum type %d not supported", ""),
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cktype);
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return KRB5_PROG_SUMTYPE_NOSUPP;
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}
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kd.key = key;
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kd.schedule = NULL;
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ret = _krb5_internal_hmac(context, c, data, len, usage, &kd, result);
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if (kd.schedule)
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krb5_free_data(context, kd.schedule);
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return ret;
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}
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krb5_error_code
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_krb5_SP_HMAC_SHA1_checksum(krb5_context context,
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struct _krb5_key_data *key,
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const void *data,
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size_t len,
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unsigned usage,
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Checksum *result)
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{
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struct _krb5_checksum_type *c = _krb5_find_checksum(CKSUMTYPE_SHA1);
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Checksum res;
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char sha1_data[20];
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krb5_error_code ret;
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res.checksum.data = sha1_data;
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res.checksum.length = sizeof(sha1_data);
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ret = _krb5_internal_hmac(context, c, data, len, usage, key, &res);
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if (ret)
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krb5_abortx(context, "hmac failed");
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memcpy(result->checksum.data, res.checksum.data, result->checksum.length);
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return 0;
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}
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struct _krb5_checksum_type _krb5_checksum_sha1 = {
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CKSUMTYPE_SHA1,
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"sha1",
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64,
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20,
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F_CPROOF,
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SHA1_checksum,
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NULL
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};
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struct _krb5_checksum_type *
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_krb5_find_checksum(krb5_cksumtype type)
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{
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int i;
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for(i = 0; i < _krb5_num_checksums; i++)
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if(_krb5_checksum_types[i]->type == type)
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return _krb5_checksum_types[i];
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return NULL;
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}
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static krb5_error_code
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get_checksum_key(krb5_context context,
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krb5_crypto crypto,
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unsigned usage, /* not krb5_key_usage */
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struct _krb5_checksum_type *ct,
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struct _krb5_key_data **key)
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{
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krb5_error_code ret = 0;
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if(ct->flags & F_DERIVED)
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ret = _get_derived_key(context, crypto, usage, key);
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else if(ct->flags & F_VARIANT) {
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size_t i;
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*key = _new_derived_key(crypto, 0xff/* KRB5_KU_RFC1510_VARIANT */);
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if(*key == 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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ret = krb5_copy_keyblock(context, crypto->key.key, &(*key)->key);
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if(ret)
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return ret;
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for(i = 0; i < (*key)->key->keyvalue.length; i++)
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((unsigned char*)(*key)->key->keyvalue.data)[i] ^= 0xF0;
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} else {
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*key = &crypto->key;
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}
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if(ret == 0)
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ret = _key_schedule(context, *key);
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return ret;
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}
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static krb5_error_code
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create_checksum (krb5_context context,
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struct _krb5_checksum_type *ct,
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krb5_crypto crypto,
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unsigned usage,
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void *data,
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size_t len,
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Checksum *result)
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{
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krb5_error_code ret;
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struct _krb5_key_data *dkey;
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int keyed_checksum;
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if (ct->flags & F_DISABLED) {
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krb5_clear_error_message (context);
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return KRB5_PROG_SUMTYPE_NOSUPP;
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}
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keyed_checksum = (ct->flags & F_KEYED) != 0;
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if(keyed_checksum && crypto == NULL) {
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krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
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N_("Checksum type %s is keyed but no "
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"crypto context (key) was passed in", ""),
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ct->name);
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return KRB5_PROG_SUMTYPE_NOSUPP; /* XXX */
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}
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if(keyed_checksum) {
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ret = get_checksum_key(context, crypto, usage, ct, &dkey);
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if (ret)
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return ret;
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} else
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dkey = NULL;
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result->cksumtype = ct->type;
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ret = krb5_data_alloc(&result->checksum, ct->checksumsize);
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if (ret)
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return (ret);
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return (*ct->checksum)(context, dkey, data, len, usage, result);
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}
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static int
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arcfour_checksum_p(struct _krb5_checksum_type *ct, krb5_crypto crypto)
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{
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return (ct->type == CKSUMTYPE_HMAC_MD5) &&
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(crypto->key.key->keytype == KEYTYPE_ARCFOUR);
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}
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KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
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krb5_create_checksum(krb5_context context,
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krb5_crypto crypto,
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krb5_key_usage usage,
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int type,
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void *data,
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size_t len,
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Checksum *result)
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{
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struct _krb5_checksum_type *ct = NULL;
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unsigned keyusage;
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/* type 0 -> pick from crypto */
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if (type) {
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ct = _krb5_find_checksum(type);
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} else if (crypto) {
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ct = crypto->et->keyed_checksum;
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if (ct == NULL)
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ct = crypto->et->checksum;
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}
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if(ct == NULL) {
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krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
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N_("checksum type %d not supported", ""),
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type);
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return KRB5_PROG_SUMTYPE_NOSUPP;
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}
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if (arcfour_checksum_p(ct, crypto)) {
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keyusage = usage;
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_krb5_usage2arcfour(context, &keyusage);
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} else
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keyusage = CHECKSUM_USAGE(usage);
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return create_checksum(context, ct, crypto, keyusage,
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data, len, result);
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}
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static krb5_error_code
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verify_checksum(krb5_context context,
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krb5_crypto crypto,
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unsigned usage, /* not krb5_key_usage */
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void *data,
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size_t len,
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Checksum *cksum)
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{
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krb5_error_code ret;
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struct _krb5_key_data *dkey;
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int keyed_checksum;
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Checksum c;
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struct _krb5_checksum_type *ct;
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ct = _krb5_find_checksum(cksum->cksumtype);
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if (ct == NULL || (ct->flags & F_DISABLED)) {
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krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
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N_("checksum type %d not supported", ""),
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cksum->cksumtype);
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return KRB5_PROG_SUMTYPE_NOSUPP;
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}
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if(ct->checksumsize != cksum->checksum.length) {
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krb5_clear_error_message (context);
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krb5_set_error_message(context, KRB5KRB_AP_ERR_BAD_INTEGRITY,
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N_("Decrypt integrity check failed for checksum type %s, "
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"length was %u, expected %u", ""),
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ct->name, (unsigned)cksum->checksum.length,
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(unsigned)ct->checksumsize);
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return KRB5KRB_AP_ERR_BAD_INTEGRITY; /* XXX */
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}
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keyed_checksum = (ct->flags & F_KEYED) != 0;
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if(keyed_checksum) {
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struct _krb5_checksum_type *kct;
|
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if (crypto == NULL) {
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krb5_set_error_message(context, KRB5_PROG_SUMTYPE_NOSUPP,
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N_("Checksum type %s is keyed but no "
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"crypto context (key) was passed in", ""),
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ct->name);
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return KRB5_PROG_SUMTYPE_NOSUPP; /* XXX */
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}
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kct = crypto->et->keyed_checksum;
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if (kct == NULL || kct->type != ct->type) {
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krb5_set_error_message(context, KRB5_PROG_SUMTYPE_NOSUPP,
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N_("Checksum type %s is keyed, but "
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"the key type %s passed didnt have that checksum "
|
|
"type as the keyed type", ""),
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ct->name, crypto->et->name);
|
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return KRB5_PROG_SUMTYPE_NOSUPP; /* XXX */
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}
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|
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ret = get_checksum_key(context, crypto, usage, ct, &dkey);
|
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if (ret)
|
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return ret;
|
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} else
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dkey = NULL;
|
|
|
|
/*
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|
* If checksum have a verify function, lets use that instead of
|
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* calling ->checksum and then compare result.
|
|
*/
|
|
|
|
if(ct->verify) {
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ret = (*ct->verify)(context, dkey, data, len, usage, cksum);
|
|
if (ret)
|
|
krb5_set_error_message(context, ret,
|
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N_("Decrypt integrity check failed for checksum "
|
|
"type %s, key type %s", ""),
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|
ct->name, (crypto != NULL)? crypto->et->name : "(none)");
|
|
return ret;
|
|
}
|
|
|
|
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(krb5_data_ct_cmp(&c.checksum, &cksum->checksum) != 0) {
|
|
ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
|
|
krb5_set_error_message(context, ret,
|
|
N_("Decrypt integrity check failed for checksum "
|
|
"type %s, key type %s", ""),
|
|
ct->name, crypto ? crypto->et->name : "(unkeyed)");
|
|
} else {
|
|
ret = 0;
|
|
}
|
|
krb5_data_free (&c.checksum);
|
|
return ret;
|
|
}
|
|
|
|
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
|
|
krb5_verify_checksum(krb5_context context,
|
|
krb5_crypto crypto,
|
|
krb5_key_usage usage,
|
|
void *data,
|
|
size_t len,
|
|
Checksum *cksum)
|
|
{
|
|
struct _krb5_checksum_type *ct;
|
|
unsigned keyusage;
|
|
|
|
ct = _krb5_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;
|
|
_krb5_usage2arcfour(context, &keyusage);
|
|
} else
|
|
keyusage = CHECKSUM_USAGE(usage);
|
|
|
|
return verify_checksum(context, crypto, keyusage,
|
|
data, len, cksum);
|
|
}
|
|
|
|
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
|
|
krb5_crypto_get_checksum_type(krb5_context context,
|
|
krb5_crypto crypto,
|
|
krb5_cksumtype *type)
|
|
{
|
|
struct _krb5_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_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
|
|
krb5_checksumsize(krb5_context context,
|
|
krb5_cksumtype type,
|
|
size_t *size)
|
|
{
|
|
struct _krb5_checksum_type *ct = _krb5_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_LIB_FUNCTION krb5_boolean KRB5_LIB_CALL
|
|
krb5_checksum_is_keyed(krb5_context context,
|
|
krb5_cksumtype type)
|
|
{
|
|
struct _krb5_checksum_type *ct = _krb5_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_LIB_FUNCTION krb5_boolean KRB5_LIB_CALL
|
|
krb5_checksum_is_collision_proof(krb5_context context,
|
|
krb5_cksumtype type)
|
|
{
|
|
struct _krb5_checksum_type *ct = _krb5_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_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
|
|
krb5_checksum_disable(krb5_context context,
|
|
krb5_cksumtype type)
|
|
{
|
|
struct _krb5_checksum_type *ct = _krb5_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;
|
|
}
|
|
|
|
/************************************************************
|
|
* *
|
|
************************************************************/
|
|
|
|
struct _krb5_encryption_type *
|
|
_krb5_find_enctype(krb5_enctype type)
|
|
{
|
|
int i;
|
|
for(i = 0; i < _krb5_num_etypes; i++)
|
|
if(_krb5_etypes[i]->type == type)
|
|
return _krb5_etypes[i];
|
|
return NULL;
|
|
}
|
|
|
|
|
|
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
|
|
krb5_enctype_to_string(krb5_context context,
|
|
krb5_enctype etype,
|
|
char **string)
|
|
{
|
|
struct _krb5_encryption_type *e;
|
|
e = _krb5_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_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
|
|
krb5_string_to_enctype(krb5_context context,
|
|
const char *string,
|
|
krb5_enctype *etype)
|
|
{
|
|
int i;
|
|
for(i = 0; i < _krb5_num_etypes; i++)
|
|
if(strcasecmp(_krb5_etypes[i]->name, string) == 0){
|
|
*etype = _krb5_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_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
|
|
krb5_enctype_to_keytype(krb5_context context,
|
|
krb5_enctype etype,
|
|
krb5_keytype *keytype)
|
|
{
|
|
struct _krb5_encryption_type *e = _krb5_find_enctype(etype);
|
|
if(e == NULL) {
|
|
return unsupported_enctype (context, etype);
|
|
}
|
|
*keytype = e->keytype->type; /* XXX */
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Check if a enctype is valid, return 0 if it is.
|
|
*
|
|
* @param context Kerberos context
|
|
* @param etype enctype to check if its valid or not
|
|
*
|
|
* @return Return an error code for an failure or 0 on success (enctype valid).
|
|
* @ingroup krb5_crypto
|
|
*/
|
|
|
|
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
|
|
krb5_enctype_valid(krb5_context context,
|
|
krb5_enctype etype)
|
|
{
|
|
struct _krb5_encryption_type *e = _krb5_find_enctype(etype);
|
|
if(e && (e->flags & F_DISABLED) == 0)
|
|
return 0;
|
|
if (context == NULL)
|
|
return KRB5_PROG_ETYPE_NOSUPP;
|
|
if(e == NULL) {
|
|
return unsupported_enctype (context, etype);
|
|
}
|
|
/* Must be (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 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_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
|
|
krb5_cksumtype_to_enctype(krb5_context context,
|
|
krb5_cksumtype ctype,
|
|
krb5_enctype *etype)
|
|
{
|
|
int i;
|
|
|
|
*etype = ETYPE_NULL;
|
|
|
|
for(i = 0; i < _krb5_num_etypes; i++) {
|
|
if(_krb5_etypes[i]->keyed_checksum &&
|
|
_krb5_etypes[i]->keyed_checksum->type == ctype)
|
|
{
|
|
*etype = _krb5_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_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
|
|
krb5_cksumtype_valid(krb5_context context,
|
|
krb5_cksumtype ctype)
|
|
{
|
|
struct _krb5_checksum_type *c = _krb5_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 _krb5_key_data *dkey;
|
|
const struct _krb5_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 _krb5_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 _krb5_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 _krb5_key_data *dkey;
|
|
struct _krb5_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 _krb5_encryption_type *et = crypto->et;
|
|
|
|
if ((len % et->padsize) != 0) {
|
|
krb5_clear_error_message(context);
|
|
return KRB5_BAD_MSIZE;
|
|
}
|
|
checksum_sz = CHECKSUMSIZE(et->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;
|
|
}
|
|
|
|
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 _krb5_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;
|
|
}
|
|
if (len < cksum_sz + et->confoundersize) {
|
|
krb5_set_error_message(context, KRB5_BAD_MSIZE,
|
|
N_("Encrypted data shorter then "
|
|
"checksum + confunder", ""));
|
|
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, size_t num_data, unsigned type)
|
|
{
|
|
size_t 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_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
|
|
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 _krb5_key_data *dkey;
|
|
const struct _krb5_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_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
|
|
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 _krb5_key_data *dkey;
|
|
struct _krb5_encryption_type *et = crypto->et;
|
|
krb5_crypto_iov *tiv, *hiv;
|
|
|
|
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_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
|
|
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;
|
|
size_t i;
|
|
size_t len;
|
|
char *p, *q;
|
|
|
|
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_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
|
|
krb5_verify_checksum_iov(krb5_context context,
|
|
krb5_crypto crypto,
|
|
unsigned usage,
|
|
krb5_crypto_iov *data,
|
|
unsigned int num_data,
|
|
krb5_cksumtype *type)
|
|
{
|
|
struct _krb5_encryption_type *et = crypto->et;
|
|
Checksum cksum;
|
|
krb5_crypto_iov *civ;
|
|
krb5_error_code ret;
|
|
size_t i;
|
|
size_t len;
|
|
char *p, *q;
|
|
|
|
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_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
|
|
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_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
|
|
krb5_crypto_length_iov(krb5_context context,
|
|
krb5_crypto crypto,
|
|
krb5_crypto_iov *data,
|
|
unsigned int num_data)
|
|
{
|
|
krb5_error_code ret;
|
|
size_t 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_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
|
|
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_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
|
|
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_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
|
|
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_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
|
|
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_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
|
|
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_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
|
|
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);
|
|
}
|
|
|
|
/************************************************************
|
|
* *
|
|
************************************************************/
|
|
|
|
krb5_error_code
|
|
_krb5_derive_key(krb5_context context,
|
|
struct _krb5_encryption_type *et,
|
|
struct _krb5_key_data *key,
|
|
const void *constant,
|
|
size_t len)
|
|
{
|
|
unsigned char *k = NULL;
|
|
unsigned int nblocks = 0, i;
|
|
krb5_error_code ret = 0;
|
|
struct _krb5_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 ETYPE_OLD_DES3_CBC_SHA1:
|
|
_krb5_DES3_random_to_key(context, key->key, k, nblocks * et->blocksize);
|
|
break;
|
|
case ENCTYPE_AES128_CTS_HMAC_SHA1_96:
|
|
case ENCTYPE_AES256_CTS_HMAC_SHA1_96:
|
|
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 _krb5_key_data *
|
|
_new_derived_key(krb5_crypto crypto, unsigned usage)
|
|
{
|
|
struct _krb5_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_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
|
|
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 _krb5_encryption_type *et;
|
|
struct _krb5_key_data d;
|
|
|
|
*derived_key = NULL;
|
|
|
|
et = _krb5_find_enctype (etype);
|
|
if (et == NULL) {
|
|
return unsupported_enctype (context, etype);
|
|
}
|
|
|
|
ret = krb5_copy_keyblock(context, key, &d.key);
|
|
if (ret)
|
|
return ret;
|
|
|
|
d.schedule = NULL;
|
|
ret = _krb5_derive_key(context, et, &d, constant, constant_len);
|
|
if (ret == 0)
|
|
ret = krb5_copy_keyblock(context, d.key, derived_key);
|
|
_krb5_free_key_data(context, &d, et);
|
|
return ret;
|
|
}
|
|
|
|
static krb5_error_code
|
|
_get_derived_key(krb5_context context,
|
|
krb5_crypto crypto,
|
|
unsigned usage,
|
|
struct _krb5_key_data **key)
|
|
{
|
|
int i;
|
|
struct _krb5_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);
|
|
_krb5_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_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
|
|
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 = _krb5_find_enctype(etype);
|
|
if((*crypto)->et == NULL || ((*crypto)->et->flags & F_DISABLED)) {
|
|
free(*crypto);
|
|
*crypto = NULL;
|
|
return unsupported_enctype(context, etype);
|
|
}
|
|
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 _krb5_key_data *key,
|
|
struct _krb5_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);
|
|
}
|
|
|
|
void
|
|
_krb5_free_key_data(krb5_context context, struct _krb5_key_data *key,
|
|
struct _krb5_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 _krb5_key_usage *ku,
|
|
struct _krb5_encryption_type *et)
|
|
{
|
|
_krb5_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_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
|
|
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);
|
|
_krb5_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_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
|
|
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_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
|
|
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_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
|
|
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_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
|
|
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_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
|
|
krb5_enctype_disable(krb5_context context,
|
|
krb5_enctype enctype)
|
|
{
|
|
struct _krb5_encryption_type *et = _krb5_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_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
|
|
krb5_enctype_enable(krb5_context context,
|
|
krb5_enctype enctype)
|
|
{
|
|
struct _krb5_encryption_type *et = _krb5_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 or disable all weak encryption types
|
|
*
|
|
* @param context Kerberos 5 context
|
|
* @param enable true to enable, false to disable
|
|
*
|
|
* @return Return an error code or 0.
|
|
*
|
|
* @ingroup krb5_crypto
|
|
*/
|
|
|
|
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
|
|
krb5_allow_weak_crypto(krb5_context context,
|
|
krb5_boolean enable)
|
|
{
|
|
int i;
|
|
|
|
for(i = 0; i < _krb5_num_etypes; i++)
|
|
if(_krb5_etypes[i]->flags & F_WEAK) {
|
|
if(enable)
|
|
_krb5_etypes[i]->flags &= ~F_DISABLED;
|
|
else
|
|
_krb5_etypes[i]->flags |= F_DISABLED;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static size_t
|
|
wrapped_length (krb5_context context,
|
|
krb5_crypto crypto,
|
|
size_t data_len)
|
|
{
|
|
struct _krb5_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 _krb5_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'
|
|
*/
|
|
|
|
KRB5_LIB_FUNCTION size_t KRB5_LIB_CALL
|
|
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 _krb5_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 _krb5_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;
|
|
}
|
|
|
|
KRB5_LIB_FUNCTION size_t KRB5_LIB_CALL
|
|
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_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
|
|
krb5_random_to_key(krb5_context context,
|
|
krb5_enctype type,
|
|
const void *data,
|
|
size_t size,
|
|
krb5_keyblock *key)
|
|
{
|
|
krb5_error_code ret;
|
|
struct _krb5_encryption_type *et = _krb5_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_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
|
|
krb5_crypto_prf_length(krb5_context context,
|
|
krb5_enctype type,
|
|
size_t *length)
|
|
{
|
|
struct _krb5_encryption_type *et = _krb5_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_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
|
|
krb5_crypto_prf(krb5_context context,
|
|
const krb5_crypto crypto,
|
|
const krb5_data *input,
|
|
krb5_data *output)
|
|
{
|
|
struct _krb5_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_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
|
|
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
|
|
|
|
/**
|
|
* Deprecated: keytypes doesn't exists, they are really enctypes.
|
|
*
|
|
* @ingroup krb5_deprecated
|
|
*/
|
|
|
|
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
|
|
krb5_keytype_to_enctypes (krb5_context context,
|
|
krb5_keytype keytype,
|
|
unsigned *len,
|
|
krb5_enctype **val)
|
|
KRB5_DEPRECATED_FUNCTION("Use X instead")
|
|
{
|
|
int i;
|
|
unsigned n = 0;
|
|
krb5_enctype *ret;
|
|
|
|
for (i = _krb5_num_etypes - 1; i >= 0; --i) {
|
|
if (_krb5_etypes[i]->keytype->type == keytype
|
|
&& !(_krb5_etypes[i]->flags & F_PSEUDO)
|
|
&& krb5_enctype_valid(context, _krb5_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 = _krb5_num_etypes - 1; i >= 0; --i) {
|
|
if (_krb5_etypes[i]->keytype->type == keytype
|
|
&& !(_krb5_etypes[i]->flags & F_PSEUDO)
|
|
&& krb5_enctype_valid(context, _krb5_etypes[i]->type) == 0)
|
|
ret[n++] = _krb5_etypes[i]->type;
|
|
}
|
|
*len = n;
|
|
*val = ret;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Deprecated: keytypes doesn't exists, they are really enctypes.
|
|
*
|
|
* @ingroup krb5_deprecated
|
|
*/
|
|
|
|
/* if two enctypes have compatible keys */
|
|
KRB5_LIB_FUNCTION krb5_boolean KRB5_LIB_CALL
|
|
krb5_enctypes_compatible_keys(krb5_context context,
|
|
krb5_enctype etype1,
|
|
krb5_enctype etype2)
|
|
KRB5_DEPRECATED_FUNCTION("Use X instead")
|
|
{
|
|
struct _krb5_encryption_type *e1 = _krb5_find_enctype(etype1);
|
|
struct _krb5_encryption_type *e2 = _krb5_find_enctype(etype2);
|
|
return e1 != NULL && e2 != NULL && e1->keytype == e2->keytype;
|
|
}
|
|
|
|
#endif /* HEIMDAL_SMALLER */
|