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arcfour gss-api mech, get_mic/verify_mic working

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git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@12655 ec53bebd-3082-4978-b11e-865c3cabbd6b
This commit is contained in:
Love Hörnquist Åstrand
2003-08-27 03:53:25 +00:00
parent 22ea5f3f5c
commit 417d3481f7
4 changed files with 1288 additions and 0 deletions
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555
lib/gssapi/arcfour.c Normal file
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/*
* Copyright (c) 2003 Kungliga Tekniska H<>gskolan
* (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.
*/
#include "gssapi_locl.h"
#if 0
static const char arcfour_sk[] = "signaturekey";
static krb5_error_code
get_arcfour_sk(krb5_context context, krb5_keyblock *key,
void *sk_key_data, size_t sk_key_size)
{
Checksum cksum_k4;
cksum_k4.checksum.data = sk_key_data;
cksum_k4.checksum.length = sk_key_size;
return krb5_hmac(context, CKSUMTYPE_RSA_MD5,
arcfour_sk, sizeof(arcfour_sk), 13, /* XXX usage */
key, &cksum_k4);
}
#endif
static krb5_error_code
arcfour_mic_key(krb5_context context, krb5_keyblock *key,
const void *header, size_t header_size,
const void *message, size_t message_size,
void *cksum_data, size_t cksum_size,
void *key6_data, size_t key6_size)
{
krb5_error_code ret;
Checksum cksum_k5;
krb5_keyblock key5;
char k5_data[16];
Checksum cksum_k6;
char T[4];
/* draft: T = 0; */
memset(T, 0, 4);
/* draft: HMAC (K, &T, 4, K5); */
cksum_k5.checksum.data = k5_data;
cksum_k5.checksum.length = sizeof(k5_data);
ret = krb5_hmac(context, CKSUMTYPE_RSA_MD5,
T, 4, 0, key, &cksum_k5);
if (ret)
return ret;
key5.keytype = KEYTYPE_ARCFOUR;
key5.keyvalue = cksum_k5.checksum;
/* HMAC(K5, MIC_checksum, 8, K6); */
cksum_k6.checksum.data = key6_data;
cksum_k6.checksum.length = key6_size;
return krb5_hmac(context, CKSUMTYPE_RSA_MD5,
cksum_data, cksum_size, 0, &key5, &cksum_k6);
}
static krb5_error_code
arcfour_mic_cksum(const char *p, size_t p_sz,
const gss_buffer_t message_buffer,
krb5_keyblock *key,
u_char *sgn_cksum, size_t sgn_cksum_sz)
{
Checksum CKSUM;
u_char *ptr = emalloc(p_sz + message_buffer->length);
krb5_crypto crypto;
krb5_error_code ret;
assert(sgn_cksum_sz == 8);
memcpy(ptr, p, p_sz);
memcpy(ptr + p_sz, message_buffer->value, message_buffer->length);
ret = krb5_crypto_init(gssapi_krb5_context, key, 0, &crypto);
if (ret) {
free(ptr);
return ret;
}
ret = krb5_create_checksum(gssapi_krb5_context,
crypto,
KRB5_KU_USAGE_SIGN,
0,
ptr,
p_sz + message_buffer->length,
&CKSUM);
free(ptr);
if (ret == 0) {
memcpy(sgn_cksum, CKSUM.checksum.data, sgn_cksum_sz);
krb5_free_checksum_contents(gssapi_krb5_context, &CKSUM);
}
krb5_crypto_destroy(gssapi_krb5_context, crypto);
return ret;
}
OM_uint32
_gssapi_get_mic_arcfour
(OM_uint32 * minor_status,
const gss_ctx_id_t context_handle,
gss_qop_t qop_req,
const gss_buffer_t message_buffer,
gss_buffer_t message_token,
krb5_keyblock *key
)
{
gss_arcfour_mic_token *token;
krb5_error_code kret;
u_char *p;
int32_t seq_number;
size_t len, total_len;
char k6_data[16];
gssapi_krb5_encap_length (22, &len, &total_len, GSS_KRB5_MECHANISM);
message_token->length = total_len;
message_token->value = malloc (total_len);
if (message_token->value == NULL) {
*minor_status = ENOMEM;
return GSS_S_FAILURE;
}
p = _gssapi_make_mech_header(message_token->value,
len,
GSS_KRB5_MECHANISM);
token = (gss_arcfour_mic_token *)p;
token->TOK_ID[0] = 0x01;
token->TOK_ID[1] = 0x01;
token->SGN_ALG[0] = 0x11;
token->SGN_ALG[1] = 0x00;
token->Filler[0] = 0xff;
token->Filler[1] = 0xff;
token->Filler[2] = 0xff;
token->Filler[3] = 0xff;
kret = arcfour_mic_cksum(p, 8, message_buffer, key, token->SGN_CKSUM, 8);
if (kret) {
*minor_status = kret;
gss_release_buffer(minor_status, message_token);
return GSS_S_FAILURE;
}
kret = arcfour_mic_key(gssapi_krb5_context, key,
p, 8,
message_buffer->value,message_buffer->length,
token->SGN_CKSUM, 8,
k6_data, sizeof(k6_data));
if (kret) {
*minor_status = kret;
return GSS_S_FAILURE;
}
p += 8;
/* draft: copy_seq_num_in_big_endian(seq_num, seq_plus_direction); */
/* draft: copy_direction_flag (direction_flag, seq_plus_direction + 4); */
HEIMDAL_MUTEX_lock(&context_handle->ctx_id_mutex);
krb5_auth_con_getlocalseqnumber (gssapi_krb5_context,
context_handle->auth_context,
&seq_number);
p[0] = (seq_number >> 24) & 0xFF;
p[1] = (seq_number >> 16) & 0xFF;
p[2] = (seq_number >> 8) & 0xFF;
p[3] = (seq_number >> 0) & 0xFF;
krb5_auth_con_setlocalseqnumber (gssapi_krb5_context,
context_handle->auth_context,
++seq_number);
HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex);
memset (p + 4,
(context_handle->more_flags & LOCAL) ? 0xFF : 0,
4);
/* draft: RC4(K6, seq_plus_direction, 8, MIC_seq); */
{
RC4_KEY rc4_key;
RC4_set_key (&rc4_key, sizeof(k6_data), k6_data);
RC4 (&rc4_key, 8, p, p);
memset(&rc4_key, 0, sizeof(rc4_key));
}
return GSS_S_COMPLETE;
}
OM_uint32
_gssapi_verify_mic_arcfour
(OM_uint32 * minor_status,
const gss_ctx_id_t context_handle,
const gss_buffer_t message_buffer,
const gss_buffer_t token_buffer,
gss_qop_t * qop_state,
char *type,
krb5_keyblock *key
)
{
krb5_error_code kret;
int32_t seq_number;
OM_uint32 ret;
char cksum_data[8], k6_data[16];
u_char *p;
int cmp;
p = token_buffer->value;
ret = gssapi_krb5_verify_header (&p,
token_buffer->length,
type,
GSS_KRB5_MECHANISM);
if (ret)
return ret;
if (memcmp(p, "\x11\x00", 2) != 0) /* SGN_ALG = HMAC MD5 ARCFOUR */
return GSS_S_BAD_SIG;
p += 2;
if (memcmp (p, "\xff\xff\xff\xff", 4) != 0)
return GSS_S_BAD_MIC;
p += 4;
/* draft: memcpy (T_plus_hdr_plus_msg + 04, MIC_hdr, 8); */
/* draft: memcpy (T_plus_hdr_plus_msg + 12, msg, msg_len); */
kret = arcfour_mic_cksum(p, 8, message_buffer, key,
cksum_data, sizeof(cksum_data));
if (kret) {
*minor_status = kret;
return GSS_S_FAILURE;
}
kret = arcfour_mic_key(gssapi_krb5_context, key,
p - 8, 8,
message_buffer->value,
message_buffer->length,
cksum_data, sizeof(cksum_data),
k6_data, sizeof(k6_data));
if (kret) {
*minor_status = kret;
return GSS_S_FAILURE;
}
cmp = memcmp(cksum_data, p + 8, 8);
if (cmp) {
*minor_status = 0;
return GSS_S_BAD_MIC;
}
/* XXX don't modify p */
{
RC4_KEY rc4_key;
RC4_set_key (&rc4_key, sizeof(k6_data), k6_data);
RC4 (&rc4_key, 8, p, p);
memset(&rc4_key, 0, sizeof(rc4_key));
}
gssapi_decode_om_uint32(p, &seq_number);
if (context_handle->more_flags & LOCAL)
cmp = memcmp(&p[4], "\xff\xff\xff\xff", 4);
else
cmp = memcmp(&p[4], "\x00\x00\x00\x00", 4);
if (cmp != 0) {
*minor_status = 0;
return GSS_S_BAD_MIC;
}
HEIMDAL_MUTEX_lock(&context_handle->ctx_id_mutex);
ret = gssapi_msg_order_check(context_handle->order, seq_number);
HEIMDAL_MUTEX_lock(&context_handle->ctx_id_mutex);
if (ret)
return ret;
return 0;
}
OM_uint32
_gssapi_wrap_arcfour
(OM_uint32 * minor_status,
const gss_ctx_id_t context_handle,
int conf_req_flag,
gss_qop_t qop_req,
const gss_buffer_t input_message_buffer,
int * conf_state,
gss_buffer_t output_message_buffer,
krb5_keyblock *key
)
{
#if 0
u_char *p;
OM_uint32 ret;
int32_t seq_number;
size_t len, total_len, datalen;
gss_arcfour_wrap_token *token;
krb5_keyblock key7;
char k7_data[16];
Checksum cksum_k8;
krb5_keyblock key8;
char k8_data[16];
Checksum cksum_k9;
krb5_keyblock key9;
char k9_data[16];
krb5_keyblock key10;
char k10_data[16];
Checksum cksum_k11;
char k11_data[16];
Checksum CKSUM;
char cksum_data[16];
datalen = input_message_buffer->length;
len = datalen + 30;
gssapi_krb5_encap_length (len, &len, &total_len, GSS_KRB5_MECHANISM);
output_message_buffer->length = total_len;
output_message_buffer->value = malloc (total_len);
if (output_message_buffer->value == NULL) {
*minor_status = ENOMEM;
return GSS_S_FAILURE;
}
p = gssapi_krb5_make_header(output_message_buffer->value,
len,
"\x02\x01", /* TOK_ID */
GSS_KRB5_MECHANISM);
token = (gss_arcfour_wrap_token *)p;
token->SGN_ALG[0] = 0x11;
token->SGN_ALG[1] = 0x00;
if (conf_req_flag) {
token->SEAL_ALG[0] = 0x00;
token->SEAL_ALG[1] = 0x00;
} else {
token->SEAL_ALG[0] = 0xff;
token->SEAL_ALG[1] = 0xff;
}
token->Filler[0] = 0xff;
token->Filler[1] = 0xff;
memset(p + 8, 0, 16); /* XXX SND_SEQ, SGN_CKSUM */
/* Confounder */
krb5_generate_random_block(p + 16, 8);
ret = get_arcfour_sk(gssapi_krb5_context, key, k7_data, sizeof(k7_data));
if (ret) {
gss_release_buffer(minor_status, output_message_buffer);
return ret;
}
key7.keytype = KEYTYPE_ARCFOUR;
key7.keyvalue.length = sizeof(k7_data);
key7.keyvalue.data = k7_data;
{
u_char T[4];
MD5_CTX md5;
u_char hash[16];
T[0] = 13;
T[1] = 0;
T[2] = 0;
T[3] = 0;
MD5_Init(&md5);
MD5_Update(&md5, T, 4); /* T */
MD5_Update(&md5, p - 8, 8); /* Token.Header */
MD5_Update(&md5, p + 16, 8); /* Confounder */
MD5_Update(&md5,
input_message_buffer->value, input_message_buffer->length);
MD5_Final(hash, &md5);
CKSUM.checksum.data = cksum_data;
CKSUM.checksum.length = sizeof(cksum_data);
/* draft: HMAC (K7, MD5_of_T_hdr_msg, CHKSUM); */
ret = krb5_hmac(gssapi_krb5_context, CKSUMTYPE_RSA_MD5,
hash, sizeof(hash),
0 /* XXX */, &key7, &CKSUM);
if (ret) {
gss_release_buffer(minor_status, output_message_buffer);
return ret;
}
}
{
u_char T[4];
memset(T, 0, sizeof(T));
cksum_k8.checksum.data = k8_data;
cksum_k8.checksum.length = sizeof(k8_data);
ret = krb5_hmac(gssapi_krb5_context, CKSUMTYPE_RSA_MD5,
T, sizeof(T), 4 /* XXX */, key, &cksum_k8);
if (ret) {
gss_release_buffer(minor_status, output_message_buffer);
return ret;
}
}
cksum_k9.checksum.data = k9_data;
cksum_k9.checksum.length = sizeof(k9_data);
key8.keytype = KEYTYPE_ARCFOUR;
key8.keyvalue.length = sizeof(k8_data);
key8.keyvalue.data = k8_data;
ret = krb5_hmac(gssapi_krb5_context, CKSUMTYPE_RSA_MD5,
cksum_data, sizeof(cksum_data),
8 /* XXX */, &key8, &cksum_k9);
if (ret) {
gss_release_buffer(minor_status, output_message_buffer);
return ret;
}
key9.keytype = KEYTYPE_ARCFOUR;
key9.keyvalue.length = sizeof(k9_data);
key9.keyvalue.data = k9_data;
HEIMDAL_MUTEX_lock(&context_handle->ctx_id_mutex);
krb5_auth_con_getlocalseqnumber (gssapi_krb5_context,
context_handle->auth_context,
&seq_number);
p[0] = (seq_number >> 0) & 0xFF;
p[1] = (seq_number >> 8) & 0xFF;
p[2] = (seq_number >> 16) & 0xFF;
p[3] = (seq_number >> 24) & 0xFF;
krb5_auth_con_setlocalseqnumber (gssapi_krb5_context,
context_handle->auth_context,
++seq_number);
HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex);
memset (p + 4, (context_handle->more_flags & LOCAL) ? 0 : 0xFF, 4);
{
RC4_KEY rc4_key;
RC4_set_key (&rc4_key, sizeof(k9_data), k9_data);
RC4 (&rc4_key, 8, p, p);
memset(&rc4_key, 0, sizeof(rc4_key));
}
p += 8;
memcpy(p, cksum_data, 8);
key10.keytype = KEYTYPE_ARCFOUR;
key10.keyvalue.length = sizeof(k10_data);
key10.keyvalue.data = k10_data;
assert(key->keyvalue.length == 16);
{
int i;
memcpy(k10_data, key->keyvalue.data, sizeof(k10_data));
for (i = 0; i < sizeof(k10_data); i++)
k10_data[i] ^= 0xF0;
}
{
u_char T[4];
memset(T, 0, sizeof(T));
cksum_k11.checksum.data = k11_data;
cksum_k11.checksum.length = sizeof(k11_data);
ret = krb5_hmac(gssapi_krb5_context, CKSUMTYPE_RSA_MD5,
T, sizeof(T), 4 /* XXX */, &key10, &cksum_k11);
if (ret) {
gss_release_buffer(minor_status, output_message_buffer);
return ret;
}
}
memcpy(p + 8, input_message_buffer->value,
input_message_buffer->length);
p[8 + input_message_buffer->length] = 1;
if (conf_req_flag) {
RC4_KEY rc4_key;
RC4_set_key (&rc4_key, sizeof(k11_data), k11_data);
RC4 (&rc4_key, 8 + input_message_buffer->length, p, p);
memset(&rc4_key, 0, sizeof(rc4_key));
}
*minor_status = 0;
return GSS_S_COMPLETE;
#else
*minor_status = (OM_uint32)KRB5_PROG_ETYPE_NOSUPP;
return GSS_S_FAILURE;
#endif
}
OM_uint32 _gssapi_unwrap_arcfour(OM_uint32 *minor_status,
const gss_ctx_id_t context_handle,
const gss_buffer_t input_message_buffer,
gss_buffer_t output_message_buffer,
int *conf_state,
gss_qop_t *qop_state,
krb5_keyblock *key)
{
*minor_status = (OM_uint32)KRB5_PROG_ETYPE_NOSUPP;
return GSS_S_FAILURE;
}

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/*
* Copyright (c) 2003 Kungliga Tekniska H<>gskolan
* (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.
*/
/* $Id$ */
#ifndef GSSAPI_ARCFOUR_H_
#define GSSAPI_ARCFOUR_H_ 1
typedef struct gss_arcfour_mic_token {
u_char TOK_ID[2]; /* 01 01 */
u_char SGN_ALG[2]; /* 11 00 */
u_char Filler[4];
u_char SND_SEQ[8];
u_char SGN_CKSUM[8];
} gss_arcfour_mic_token;
typedef struct gss_arcfour_wrap_token {
u_char TOK_ID[2]; /* 02 01 */
u_char SGN_ALG[2];
u_char SEAL_ALG[2];
u_char Filler[2];
u_char SND_SEQ[8];
u_char SGN_CKSUM[8];
u_char Confounder[8];
} gss_arcfour_wrap_token;
OM_uint32 _gssapi_wrap_arcfour(OM_uint32 *minor_status,
const gss_ctx_id_t context_handle,
int conf_req_flag,
gss_qop_t qop_req,
const gss_buffer_t input_message_buffer,
int *conf_state,
gss_buffer_t output_message_buffer,
krb5_keyblock *key);
OM_uint32 _gssapi_unwrap_arcfour(OM_uint32 *minor_status,
const gss_ctx_id_t context_handle,
const gss_buffer_t input_message_buffer,
gss_buffer_t output_message_buffer,
int *conf_state,
gss_qop_t *qop_state,
krb5_keyblock *key);
OM_uint32 _gssapi_get_mic_arcfour(OM_uint32 *minor_status,
const gss_ctx_id_t context_handle,
gss_qop_t qop_req,
const gss_buffer_t message_buffer,
gss_buffer_t message_token,
krb5_keyblock *key);
OM_uint32 _gssapi_verify_mic_arcfour(OM_uint32 *minor_status,
const gss_ctx_id_t context_handle,
const gss_buffer_t message_buffer,
const gss_buffer_t token_buffer,
gss_qop_t *qop_state,
char *type,
krb5_keyblock *key);
#endif /* GSSAPI_ARCFOUR_H_ */

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lib/gssapi/krb5/arcfour.c Normal file
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/*
* Copyright (c) 2003 Kungliga Tekniska H<>gskolan
* (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.
*/
#include "gssapi_locl.h"
#if 0
static const char arcfour_sk[] = "signaturekey";
static krb5_error_code
get_arcfour_sk(krb5_context context, krb5_keyblock *key,
void *sk_key_data, size_t sk_key_size)
{
Checksum cksum_k4;
cksum_k4.checksum.data = sk_key_data;
cksum_k4.checksum.length = sk_key_size;
return krb5_hmac(context, CKSUMTYPE_RSA_MD5,
arcfour_sk, sizeof(arcfour_sk), 13, /* XXX usage */
key, &cksum_k4);
}
#endif
static krb5_error_code
arcfour_mic_key(krb5_context context, krb5_keyblock *key,
const void *header, size_t header_size,
const void *message, size_t message_size,
void *cksum_data, size_t cksum_size,
void *key6_data, size_t key6_size)
{
krb5_error_code ret;
Checksum cksum_k5;
krb5_keyblock key5;
char k5_data[16];
Checksum cksum_k6;
char T[4];
/* draft: T = 0; */
memset(T, 0, 4);
/* draft: HMAC (K, &T, 4, K5); */
cksum_k5.checksum.data = k5_data;
cksum_k5.checksum.length = sizeof(k5_data);
ret = krb5_hmac(context, CKSUMTYPE_RSA_MD5,
T, 4, 0, key, &cksum_k5);
if (ret)
return ret;
key5.keytype = KEYTYPE_ARCFOUR;
key5.keyvalue = cksum_k5.checksum;
/* HMAC(K5, MIC_checksum, 8, K6); */
cksum_k6.checksum.data = key6_data;
cksum_k6.checksum.length = key6_size;
return krb5_hmac(context, CKSUMTYPE_RSA_MD5,
cksum_data, cksum_size, 0, &key5, &cksum_k6);
}
static krb5_error_code
arcfour_mic_cksum(const char *p, size_t p_sz,
const gss_buffer_t message_buffer,
krb5_keyblock *key,
u_char *sgn_cksum, size_t sgn_cksum_sz)
{
Checksum CKSUM;
u_char *ptr = emalloc(p_sz + message_buffer->length);
krb5_crypto crypto;
krb5_error_code ret;
assert(sgn_cksum_sz == 8);
memcpy(ptr, p, p_sz);
memcpy(ptr + p_sz, message_buffer->value, message_buffer->length);
ret = krb5_crypto_init(gssapi_krb5_context, key, 0, &crypto);
if (ret) {
free(ptr);
return ret;
}
ret = krb5_create_checksum(gssapi_krb5_context,
crypto,
KRB5_KU_USAGE_SIGN,
0,
ptr,
p_sz + message_buffer->length,
&CKSUM);
free(ptr);
if (ret == 0) {
memcpy(sgn_cksum, CKSUM.checksum.data, sgn_cksum_sz);
krb5_free_checksum_contents(gssapi_krb5_context, &CKSUM);
}
krb5_crypto_destroy(gssapi_krb5_context, crypto);
return ret;
}
OM_uint32
_gssapi_get_mic_arcfour
(OM_uint32 * minor_status,
const gss_ctx_id_t context_handle,
gss_qop_t qop_req,
const gss_buffer_t message_buffer,
gss_buffer_t message_token,
krb5_keyblock *key
)
{
gss_arcfour_mic_token *token;
krb5_error_code kret;
u_char *p;
int32_t seq_number;
size_t len, total_len;
char k6_data[16];
gssapi_krb5_encap_length (22, &len, &total_len, GSS_KRB5_MECHANISM);
message_token->length = total_len;
message_token->value = malloc (total_len);
if (message_token->value == NULL) {
*minor_status = ENOMEM;
return GSS_S_FAILURE;
}
p = _gssapi_make_mech_header(message_token->value,
len,
GSS_KRB5_MECHANISM);
token = (gss_arcfour_mic_token *)p;
token->TOK_ID[0] = 0x01;
token->TOK_ID[1] = 0x01;
token->SGN_ALG[0] = 0x11;
token->SGN_ALG[1] = 0x00;
token->Filler[0] = 0xff;
token->Filler[1] = 0xff;
token->Filler[2] = 0xff;
token->Filler[3] = 0xff;
kret = arcfour_mic_cksum(p, 8, message_buffer, key, token->SGN_CKSUM, 8);
if (kret) {
*minor_status = kret;
gss_release_buffer(minor_status, message_token);
return GSS_S_FAILURE;
}
kret = arcfour_mic_key(gssapi_krb5_context, key,
p, 8,
message_buffer->value,message_buffer->length,
token->SGN_CKSUM, 8,
k6_data, sizeof(k6_data));
if (kret) {
*minor_status = kret;
return GSS_S_FAILURE;
}
p += 8;
/* draft: copy_seq_num_in_big_endian(seq_num, seq_plus_direction); */
/* draft: copy_direction_flag (direction_flag, seq_plus_direction + 4); */
HEIMDAL_MUTEX_lock(&context_handle->ctx_id_mutex);
krb5_auth_con_getlocalseqnumber (gssapi_krb5_context,
context_handle->auth_context,
&seq_number);
p[0] = (seq_number >> 24) & 0xFF;
p[1] = (seq_number >> 16) & 0xFF;
p[2] = (seq_number >> 8) & 0xFF;
p[3] = (seq_number >> 0) & 0xFF;
krb5_auth_con_setlocalseqnumber (gssapi_krb5_context,
context_handle->auth_context,
++seq_number);
HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex);
memset (p + 4,
(context_handle->more_flags & LOCAL) ? 0xFF : 0,
4);
/* draft: RC4(K6, seq_plus_direction, 8, MIC_seq); */
{
RC4_KEY rc4_key;
RC4_set_key (&rc4_key, sizeof(k6_data), k6_data);
RC4 (&rc4_key, 8, p, p);
memset(&rc4_key, 0, sizeof(rc4_key));
}
return GSS_S_COMPLETE;
}
OM_uint32
_gssapi_verify_mic_arcfour
(OM_uint32 * minor_status,
const gss_ctx_id_t context_handle,
const gss_buffer_t message_buffer,
const gss_buffer_t token_buffer,
gss_qop_t * qop_state,
char *type,
krb5_keyblock *key
)
{
krb5_error_code kret;
int32_t seq_number;
OM_uint32 ret;
char cksum_data[8], k6_data[16];
u_char *p;
int cmp;
p = token_buffer->value;
ret = gssapi_krb5_verify_header (&p,
token_buffer->length,
type,
GSS_KRB5_MECHANISM);
if (ret)
return ret;
if (memcmp(p, "\x11\x00", 2) != 0) /* SGN_ALG = HMAC MD5 ARCFOUR */
return GSS_S_BAD_SIG;
p += 2;
if (memcmp (p, "\xff\xff\xff\xff", 4) != 0)
return GSS_S_BAD_MIC;
p += 4;
/* draft: memcpy (T_plus_hdr_plus_msg + 04, MIC_hdr, 8); */
/* draft: memcpy (T_plus_hdr_plus_msg + 12, msg, msg_len); */
kret = arcfour_mic_cksum(p, 8, message_buffer, key,
cksum_data, sizeof(cksum_data));
if (kret) {
*minor_status = kret;
return GSS_S_FAILURE;
}
kret = arcfour_mic_key(gssapi_krb5_context, key,
p - 8, 8,
message_buffer->value,
message_buffer->length,
cksum_data, sizeof(cksum_data),
k6_data, sizeof(k6_data));
if (kret) {
*minor_status = kret;
return GSS_S_FAILURE;
}
cmp = memcmp(cksum_data, p + 8, 8);
if (cmp) {
*minor_status = 0;
return GSS_S_BAD_MIC;
}
/* XXX don't modify p */
{
RC4_KEY rc4_key;
RC4_set_key (&rc4_key, sizeof(k6_data), k6_data);
RC4 (&rc4_key, 8, p, p);
memset(&rc4_key, 0, sizeof(rc4_key));
}
gssapi_decode_om_uint32(p, &seq_number);
if (context_handle->more_flags & LOCAL)
cmp = memcmp(&p[4], "\xff\xff\xff\xff", 4);
else
cmp = memcmp(&p[4], "\x00\x00\x00\x00", 4);
if (cmp != 0) {
*minor_status = 0;
return GSS_S_BAD_MIC;
}
HEIMDAL_MUTEX_lock(&context_handle->ctx_id_mutex);
ret = gssapi_msg_order_check(context_handle->order, seq_number);
HEIMDAL_MUTEX_lock(&context_handle->ctx_id_mutex);
if (ret)
return ret;
return 0;
}
OM_uint32
_gssapi_wrap_arcfour
(OM_uint32 * minor_status,
const gss_ctx_id_t context_handle,
int conf_req_flag,
gss_qop_t qop_req,
const gss_buffer_t input_message_buffer,
int * conf_state,
gss_buffer_t output_message_buffer,
krb5_keyblock *key
)
{
#if 0
u_char *p;
OM_uint32 ret;
int32_t seq_number;
size_t len, total_len, datalen;
gss_arcfour_wrap_token *token;
krb5_keyblock key7;
char k7_data[16];
Checksum cksum_k8;
krb5_keyblock key8;
char k8_data[16];
Checksum cksum_k9;
krb5_keyblock key9;
char k9_data[16];
krb5_keyblock key10;
char k10_data[16];
Checksum cksum_k11;
char k11_data[16];
Checksum CKSUM;
char cksum_data[16];
datalen = input_message_buffer->length;
len = datalen + 30;
gssapi_krb5_encap_length (len, &len, &total_len, GSS_KRB5_MECHANISM);
output_message_buffer->length = total_len;
output_message_buffer->value = malloc (total_len);
if (output_message_buffer->value == NULL) {
*minor_status = ENOMEM;
return GSS_S_FAILURE;
}
p = gssapi_krb5_make_header(output_message_buffer->value,
len,
"\x02\x01", /* TOK_ID */
GSS_KRB5_MECHANISM);
token = (gss_arcfour_wrap_token *)p;
token->SGN_ALG[0] = 0x11;
token->SGN_ALG[1] = 0x00;
if (conf_req_flag) {
token->SEAL_ALG[0] = 0x00;
token->SEAL_ALG[1] = 0x00;
} else {
token->SEAL_ALG[0] = 0xff;
token->SEAL_ALG[1] = 0xff;
}
token->Filler[0] = 0xff;
token->Filler[1] = 0xff;
memset(p + 8, 0, 16); /* XXX SND_SEQ, SGN_CKSUM */
/* Confounder */
krb5_generate_random_block(p + 16, 8);
ret = get_arcfour_sk(gssapi_krb5_context, key, k7_data, sizeof(k7_data));
if (ret) {
gss_release_buffer(minor_status, output_message_buffer);
return ret;
}
key7.keytype = KEYTYPE_ARCFOUR;
key7.keyvalue.length = sizeof(k7_data);
key7.keyvalue.data = k7_data;
{
u_char T[4];
MD5_CTX md5;
u_char hash[16];
T[0] = 13;
T[1] = 0;
T[2] = 0;
T[3] = 0;
MD5_Init(&md5);
MD5_Update(&md5, T, 4); /* T */
MD5_Update(&md5, p - 8, 8); /* Token.Header */
MD5_Update(&md5, p + 16, 8); /* Confounder */
MD5_Update(&md5,
input_message_buffer->value, input_message_buffer->length);
MD5_Final(hash, &md5);
CKSUM.checksum.data = cksum_data;
CKSUM.checksum.length = sizeof(cksum_data);
/* draft: HMAC (K7, MD5_of_T_hdr_msg, CHKSUM); */
ret = krb5_hmac(gssapi_krb5_context, CKSUMTYPE_RSA_MD5,
hash, sizeof(hash),
0 /* XXX */, &key7, &CKSUM);
if (ret) {
gss_release_buffer(minor_status, output_message_buffer);
return ret;
}
}
{
u_char T[4];
memset(T, 0, sizeof(T));
cksum_k8.checksum.data = k8_data;
cksum_k8.checksum.length = sizeof(k8_data);
ret = krb5_hmac(gssapi_krb5_context, CKSUMTYPE_RSA_MD5,
T, sizeof(T), 4 /* XXX */, key, &cksum_k8);
if (ret) {
gss_release_buffer(minor_status, output_message_buffer);
return ret;
}
}
cksum_k9.checksum.data = k9_data;
cksum_k9.checksum.length = sizeof(k9_data);
key8.keytype = KEYTYPE_ARCFOUR;
key8.keyvalue.length = sizeof(k8_data);
key8.keyvalue.data = k8_data;
ret = krb5_hmac(gssapi_krb5_context, CKSUMTYPE_RSA_MD5,
cksum_data, sizeof(cksum_data),
8 /* XXX */, &key8, &cksum_k9);
if (ret) {
gss_release_buffer(minor_status, output_message_buffer);
return ret;
}
key9.keytype = KEYTYPE_ARCFOUR;
key9.keyvalue.length = sizeof(k9_data);
key9.keyvalue.data = k9_data;
HEIMDAL_MUTEX_lock(&context_handle->ctx_id_mutex);
krb5_auth_con_getlocalseqnumber (gssapi_krb5_context,
context_handle->auth_context,
&seq_number);
p[0] = (seq_number >> 0) & 0xFF;
p[1] = (seq_number >> 8) & 0xFF;
p[2] = (seq_number >> 16) & 0xFF;
p[3] = (seq_number >> 24) & 0xFF;
krb5_auth_con_setlocalseqnumber (gssapi_krb5_context,
context_handle->auth_context,
++seq_number);
HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex);
memset (p + 4, (context_handle->more_flags & LOCAL) ? 0 : 0xFF, 4);
{
RC4_KEY rc4_key;
RC4_set_key (&rc4_key, sizeof(k9_data), k9_data);
RC4 (&rc4_key, 8, p, p);
memset(&rc4_key, 0, sizeof(rc4_key));
}
p += 8;
memcpy(p, cksum_data, 8);
key10.keytype = KEYTYPE_ARCFOUR;
key10.keyvalue.length = sizeof(k10_data);
key10.keyvalue.data = k10_data;
assert(key->keyvalue.length == 16);
{
int i;
memcpy(k10_data, key->keyvalue.data, sizeof(k10_data));
for (i = 0; i < sizeof(k10_data); i++)
k10_data[i] ^= 0xF0;
}
{
u_char T[4];
memset(T, 0, sizeof(T));
cksum_k11.checksum.data = k11_data;
cksum_k11.checksum.length = sizeof(k11_data);
ret = krb5_hmac(gssapi_krb5_context, CKSUMTYPE_RSA_MD5,
T, sizeof(T), 4 /* XXX */, &key10, &cksum_k11);
if (ret) {
gss_release_buffer(minor_status, output_message_buffer);
return ret;
}
}
memcpy(p + 8, input_message_buffer->value,
input_message_buffer->length);
p[8 + input_message_buffer->length] = 1;
if (conf_req_flag) {
RC4_KEY rc4_key;
RC4_set_key (&rc4_key, sizeof(k11_data), k11_data);
RC4 (&rc4_key, 8 + input_message_buffer->length, p, p);
memset(&rc4_key, 0, sizeof(rc4_key));
}
*minor_status = 0;
return GSS_S_COMPLETE;
#else
*minor_status = (OM_uint32)KRB5_PROG_ETYPE_NOSUPP;
return GSS_S_FAILURE;
#endif
}
OM_uint32 _gssapi_unwrap_arcfour(OM_uint32 *minor_status,
const gss_ctx_id_t context_handle,
const gss_buffer_t input_message_buffer,
gss_buffer_t output_message_buffer,
int *conf_state,
gss_qop_t *qop_state,
krb5_keyblock *key)
{
*minor_status = (OM_uint32)KRB5_PROG_ETYPE_NOSUPP;
return GSS_S_FAILURE;
}

89
lib/gssapi/krb5/arcfour.h Normal file
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@@ -0,0 +1,89 @@
/*
* Copyright (c) 2003 Kungliga Tekniska H<>gskolan
* (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.
*/
/* $Id$ */
#ifndef GSSAPI_ARCFOUR_H_
#define GSSAPI_ARCFOUR_H_ 1
typedef struct gss_arcfour_mic_token {
u_char TOK_ID[2]; /* 01 01 */
u_char SGN_ALG[2]; /* 11 00 */
u_char Filler[4];
u_char SND_SEQ[8];
u_char SGN_CKSUM[8];
} gss_arcfour_mic_token;
typedef struct gss_arcfour_wrap_token {
u_char TOK_ID[2]; /* 02 01 */
u_char SGN_ALG[2];
u_char SEAL_ALG[2];
u_char Filler[2];
u_char SND_SEQ[8];
u_char SGN_CKSUM[8];
u_char Confounder[8];
} gss_arcfour_wrap_token;
OM_uint32 _gssapi_wrap_arcfour(OM_uint32 *minor_status,
const gss_ctx_id_t context_handle,
int conf_req_flag,
gss_qop_t qop_req,
const gss_buffer_t input_message_buffer,
int *conf_state,
gss_buffer_t output_message_buffer,
krb5_keyblock *key);
OM_uint32 _gssapi_unwrap_arcfour(OM_uint32 *minor_status,
const gss_ctx_id_t context_handle,
const gss_buffer_t input_message_buffer,
gss_buffer_t output_message_buffer,
int *conf_state,
gss_qop_t *qop_state,
krb5_keyblock *key);
OM_uint32 _gssapi_get_mic_arcfour(OM_uint32 *minor_status,
const gss_ctx_id_t context_handle,
gss_qop_t qop_req,
const gss_buffer_t message_buffer,
gss_buffer_t message_token,
krb5_keyblock *key);
OM_uint32 _gssapi_verify_mic_arcfour(OM_uint32 *minor_status,
const gss_ctx_id_t context_handle,
const gss_buffer_t message_buffer,
const gss_buffer_t token_buffer,
gss_qop_t *qop_state,
char *type,
krb5_keyblock *key);
#endif /* GSSAPI_ARCFOUR_H_ */