e50faea7f0
Creating and destroying an EVP_CTX_MD structure with every hash operation is very expensive. Speed things up by caching one within the krb5_crypto structure. krb5_crypto can already only be safely used by one thread at a time - adding a message digest context here shouldn't introduce any further threading risks. Users of the stashed context must be careful to ensure that they call no other hash functions whilst they are in the middle of using the context.
368 lines
9.8 KiB
C
368 lines
9.8 KiB
C
/*
|
|
* Copyright (c) 1997 - 2008 Kungliga Tekniska Högskolan
|
|
* (Royal Institute of Technology, Stockholm, Sweden).
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
*
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* 3. Neither the name of the Institute nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
/*
|
|
* ARCFOUR
|
|
*/
|
|
|
|
#include "krb5_locl.h"
|
|
|
|
static struct _krb5_key_type keytype_arcfour = {
|
|
KRB5_ENCTYPE_ARCFOUR_HMAC_MD5,
|
|
"arcfour",
|
|
128,
|
|
16,
|
|
sizeof(struct _krb5_evp_schedule),
|
|
NULL,
|
|
_krb5_evp_schedule,
|
|
_krb5_arcfour_salt,
|
|
NULL,
|
|
_krb5_evp_cleanup,
|
|
EVP_rc4
|
|
};
|
|
|
|
/*
|
|
* checksum according to section 5. of draft-brezak-win2k-krb-rc4-hmac-03.txt
|
|
*/
|
|
|
|
krb5_error_code
|
|
_krb5_HMAC_MD5_checksum(krb5_context context,
|
|
krb5_crypto crypto,
|
|
struct _krb5_key_data *key,
|
|
unsigned usage,
|
|
const struct krb5_crypto_iov *iov,
|
|
int niov,
|
|
Checksum *result)
|
|
{
|
|
EVP_MD_CTX *m;
|
|
struct _krb5_checksum_type *c = _krb5_find_checksum (CKSUMTYPE_RSA_MD5);
|
|
const char signature[] = "signaturekey";
|
|
Checksum ksign_c;
|
|
struct _krb5_key_data ksign;
|
|
krb5_keyblock kb;
|
|
unsigned char t[4];
|
|
unsigned char tmp[16];
|
|
unsigned char ksign_c_data[16];
|
|
krb5_error_code ret;
|
|
int i;
|
|
|
|
if (crypto != NULL) {
|
|
if (crypto->mdctx == NULL)
|
|
crypto->mdctx = EVP_MD_CTX_create();
|
|
if (crypto->mdctx == NULL)
|
|
return krb5_enomem(context);
|
|
m = crypto->mdctx;
|
|
} else
|
|
m = EVP_MD_CTX_create();
|
|
|
|
ksign_c.checksum.length = sizeof(ksign_c_data);
|
|
ksign_c.checksum.data = ksign_c_data;
|
|
ret = _krb5_internal_hmac(context, crypto, c, signature, sizeof(signature),
|
|
0, key, &ksign_c);
|
|
if (ret)
|
|
goto out;
|
|
|
|
ksign.key = &kb;
|
|
kb.keyvalue = ksign_c.checksum;
|
|
EVP_DigestInit_ex(m, EVP_md5(), NULL);
|
|
t[0] = (usage >> 0) & 0xFF;
|
|
t[1] = (usage >> 8) & 0xFF;
|
|
t[2] = (usage >> 16) & 0xFF;
|
|
t[3] = (usage >> 24) & 0xFF;
|
|
EVP_DigestUpdate(m, t, 4);
|
|
for (i = 0; i < niov; i++) {
|
|
if (_krb5_crypto_iov_should_sign(&iov[i]))
|
|
EVP_DigestUpdate(m, iov[i].data.data, iov[i].data.length);
|
|
}
|
|
EVP_DigestFinal_ex (m, tmp, NULL);
|
|
|
|
ret = _krb5_internal_hmac(context, crypto, c, tmp, sizeof(tmp), 0, &ksign, result);
|
|
out:
|
|
if (crypto == NULL)
|
|
EVP_MD_CTX_destroy(m);
|
|
|
|
return ret;
|
|
}
|
|
|
|
struct _krb5_checksum_type _krb5_checksum_hmac_md5 = {
|
|
CKSUMTYPE_HMAC_MD5,
|
|
"hmac-md5",
|
|
64,
|
|
16,
|
|
F_KEYED | F_CPROOF,
|
|
_krb5_HMAC_MD5_checksum,
|
|
NULL
|
|
};
|
|
|
|
/*
|
|
* section 6 of draft-brezak-win2k-krb-rc4-hmac-03
|
|
*
|
|
* warning: not for small children
|
|
*/
|
|
|
|
static krb5_error_code
|
|
ARCFOUR_subencrypt(krb5_context context,
|
|
struct _krb5_key_data *key,
|
|
void *data,
|
|
size_t len,
|
|
unsigned usage,
|
|
void *ivec)
|
|
{
|
|
EVP_CIPHER_CTX ctx;
|
|
struct _krb5_checksum_type *c = _krb5_find_checksum (CKSUMTYPE_RSA_MD5);
|
|
Checksum k1_c, k2_c, k3_c, cksum;
|
|
struct _krb5_key_data ke;
|
|
krb5_keyblock kb;
|
|
unsigned char t[4];
|
|
unsigned char *cdata = data;
|
|
unsigned char k1_c_data[16], k2_c_data[16], k3_c_data[16];
|
|
krb5_error_code ret;
|
|
|
|
if (len < 16) {
|
|
return KRB5KRB_AP_ERR_INAPP_CKSUM;
|
|
}
|
|
|
|
t[0] = (usage >> 0) & 0xFF;
|
|
t[1] = (usage >> 8) & 0xFF;
|
|
t[2] = (usage >> 16) & 0xFF;
|
|
t[3] = (usage >> 24) & 0xFF;
|
|
|
|
k1_c.checksum.length = sizeof(k1_c_data);
|
|
k1_c.checksum.data = k1_c_data;
|
|
|
|
ret = _krb5_internal_hmac(context, NULL, c, t, sizeof(t), 0, key, &k1_c);
|
|
if (ret)
|
|
krb5_abortx(context, "hmac failed");
|
|
|
|
memcpy (k2_c_data, k1_c_data, sizeof(k1_c_data));
|
|
|
|
k2_c.checksum.length = sizeof(k2_c_data);
|
|
k2_c.checksum.data = k2_c_data;
|
|
|
|
ke.key = &kb;
|
|
kb.keyvalue = k2_c.checksum;
|
|
|
|
cksum.checksum.length = 16;
|
|
cksum.checksum.data = data;
|
|
|
|
ret = _krb5_internal_hmac(context, NULL, c, cdata + 16, len - 16, 0, &ke, &cksum);
|
|
if (ret)
|
|
krb5_abortx(context, "hmac failed");
|
|
|
|
ke.key = &kb;
|
|
kb.keyvalue = k1_c.checksum;
|
|
|
|
k3_c.checksum.length = sizeof(k3_c_data);
|
|
k3_c.checksum.data = k3_c_data;
|
|
|
|
ret = _krb5_internal_hmac(context, NULL, c, data, 16, 0, &ke, &k3_c);
|
|
if (ret)
|
|
krb5_abortx(context, "hmac failed");
|
|
|
|
EVP_CIPHER_CTX_init(&ctx);
|
|
|
|
EVP_CipherInit_ex(&ctx, EVP_rc4(), NULL, k3_c.checksum.data, NULL, 1);
|
|
EVP_Cipher(&ctx, cdata + 16, cdata + 16, len - 16);
|
|
EVP_CIPHER_CTX_cleanup(&ctx);
|
|
|
|
memset_s(k1_c_data, sizeof(k1_c_data), 0, sizeof(k1_c_data));
|
|
memset_s(k2_c_data, sizeof(k2_c_data), 0, sizeof(k2_c_data));
|
|
memset_s(k3_c_data, sizeof(k3_c_data), 0, sizeof(k3_c_data));
|
|
return 0;
|
|
}
|
|
|
|
static krb5_error_code
|
|
ARCFOUR_subdecrypt(krb5_context context,
|
|
struct _krb5_key_data *key,
|
|
void *data,
|
|
size_t len,
|
|
unsigned usage,
|
|
void *ivec)
|
|
{
|
|
EVP_CIPHER_CTX ctx;
|
|
struct _krb5_checksum_type *c = _krb5_find_checksum (CKSUMTYPE_RSA_MD5);
|
|
Checksum k1_c, k2_c, k3_c, cksum;
|
|
struct _krb5_key_data ke;
|
|
krb5_keyblock kb;
|
|
unsigned char t[4];
|
|
unsigned char *cdata = data;
|
|
unsigned char k1_c_data[16], k2_c_data[16], k3_c_data[16];
|
|
unsigned char cksum_data[16];
|
|
krb5_error_code ret;
|
|
|
|
if (len < 16) {
|
|
return KRB5KRB_AP_ERR_INAPP_CKSUM;
|
|
}
|
|
|
|
t[0] = (usage >> 0) & 0xFF;
|
|
t[1] = (usage >> 8) & 0xFF;
|
|
t[2] = (usage >> 16) & 0xFF;
|
|
t[3] = (usage >> 24) & 0xFF;
|
|
|
|
k1_c.checksum.length = sizeof(k1_c_data);
|
|
k1_c.checksum.data = k1_c_data;
|
|
|
|
ret = _krb5_internal_hmac(context, NULL, c, t, sizeof(t), 0, key, &k1_c);
|
|
if (ret)
|
|
krb5_abortx(context, "hmac failed");
|
|
|
|
memcpy (k2_c_data, k1_c_data, sizeof(k1_c_data));
|
|
|
|
k2_c.checksum.length = sizeof(k2_c_data);
|
|
k2_c.checksum.data = k2_c_data;
|
|
|
|
ke.key = &kb;
|
|
kb.keyvalue = k1_c.checksum;
|
|
|
|
k3_c.checksum.length = sizeof(k3_c_data);
|
|
k3_c.checksum.data = k3_c_data;
|
|
|
|
ret = _krb5_internal_hmac(context, NULL, c, cdata, 16, 0, &ke, &k3_c);
|
|
if (ret)
|
|
krb5_abortx(context, "hmac failed");
|
|
|
|
EVP_CIPHER_CTX_init(&ctx);
|
|
EVP_CipherInit_ex(&ctx, EVP_rc4(), NULL, k3_c.checksum.data, NULL, 0);
|
|
EVP_Cipher(&ctx, cdata + 16, cdata + 16, len - 16);
|
|
EVP_CIPHER_CTX_cleanup(&ctx);
|
|
|
|
ke.key = &kb;
|
|
kb.keyvalue = k2_c.checksum;
|
|
|
|
cksum.checksum.length = 16;
|
|
cksum.checksum.data = cksum_data;
|
|
|
|
ret = _krb5_internal_hmac(context, NULL, c, cdata + 16, len - 16, 0, &ke, &cksum);
|
|
if (ret)
|
|
krb5_abortx(context, "hmac failed");
|
|
|
|
memset_s(k1_c_data, sizeof(k1_c_data), 0, sizeof(k1_c_data));
|
|
memset_s(k2_c_data, sizeof(k2_c_data), 0, sizeof(k2_c_data));
|
|
memset_s(k3_c_data, sizeof(k3_c_data), 0, sizeof(k3_c_data));
|
|
|
|
if (ct_memcmp (cksum.checksum.data, data, 16) != 0) {
|
|
krb5_clear_error_message (context);
|
|
return KRB5KRB_AP_ERR_BAD_INTEGRITY;
|
|
} else {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* convert the usage numbers used in
|
|
* draft-ietf-cat-kerb-key-derivation-00.txt to the ones in
|
|
* draft-brezak-win2k-krb-rc4-hmac-04.txt
|
|
*/
|
|
|
|
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
|
|
_krb5_usage2arcfour(krb5_context context, unsigned *usage)
|
|
{
|
|
switch (*usage) {
|
|
case KRB5_KU_AS_REP_ENC_PART : /* 3 */
|
|
*usage = 8;
|
|
return 0;
|
|
case KRB5_KU_USAGE_SEAL : /* 22 */
|
|
*usage = 13;
|
|
return 0;
|
|
case KRB5_KU_USAGE_SIGN : /* 23 */
|
|
*usage = 15;
|
|
return 0;
|
|
case KRB5_KU_USAGE_SEQ: /* 24 */
|
|
*usage = 0;
|
|
return 0;
|
|
default :
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
static krb5_error_code
|
|
ARCFOUR_encrypt(krb5_context context,
|
|
struct _krb5_key_data *key,
|
|
void *data,
|
|
size_t len,
|
|
krb5_boolean encryptp,
|
|
int usage,
|
|
void *ivec)
|
|
{
|
|
krb5_error_code ret;
|
|
unsigned keyusage = usage;
|
|
|
|
if((ret = _krb5_usage2arcfour (context, &keyusage)) != 0)
|
|
return ret;
|
|
|
|
if (encryptp)
|
|
return ARCFOUR_subencrypt (context, key, data, len, keyusage, ivec);
|
|
else
|
|
return ARCFOUR_subdecrypt (context, key, data, len, keyusage, ivec);
|
|
}
|
|
|
|
static krb5_error_code
|
|
ARCFOUR_prf(krb5_context context,
|
|
krb5_crypto crypto,
|
|
const krb5_data *in,
|
|
krb5_data *out)
|
|
{
|
|
struct _krb5_checksum_type *c = _krb5_find_checksum(CKSUMTYPE_SHA1);
|
|
krb5_error_code ret;
|
|
Checksum res;
|
|
|
|
ret = krb5_data_alloc(out, c->checksumsize);
|
|
if (ret)
|
|
return ret;
|
|
|
|
res.checksum.data = out->data;
|
|
res.checksum.length = out->length;
|
|
|
|
ret = _krb5_internal_hmac(context, crypto, c, in->data, in->length, 0, &crypto->key, &res);
|
|
if (ret)
|
|
krb5_data_free(out);
|
|
return 0;
|
|
}
|
|
|
|
|
|
struct _krb5_encryption_type _krb5_enctype_arcfour_hmac_md5 = {
|
|
ETYPE_ARCFOUR_HMAC_MD5,
|
|
"arcfour-hmac-md5",
|
|
"rc4-hmac",
|
|
1,
|
|
1,
|
|
8,
|
|
&keytype_arcfour,
|
|
&_krb5_checksum_hmac_md5,
|
|
&_krb5_checksum_hmac_md5,
|
|
F_SPECIAL | F_WEAK,
|
|
ARCFOUR_encrypt,
|
|
0,
|
|
ARCFOUR_prf
|
|
};
|