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heimdal/lib/gssapi/krb5/arcfour.c
Stefan Metzmacher ad3acc2aef lib/gssapi/krb5: implement gss_[un]wrap_iov[_length] with arcfour-hmac-md5 
Pair-Programmed-With: Andreas Schneider <asn@samba.org>

Signed-off-by: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Andreas Schneider <asn@samba.org>
2015-07-31 17:30:23 +12:00

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/*
* Copyright (c) 2003 - 2006 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.
*/
#include "gsskrb5_locl.h"
/*
* Implements draft-brezak-win2k-krb-rc4-hmac-04.txt
*
* The arcfour message have the following formats:
*
* MIC token
* TOK_ID[2] = 01 01
* SGN_ALG[2] = 11 00
* Filler[4]
* SND_SEQ[8]
* SGN_CKSUM[8]
*
* WRAP token
* TOK_ID[2] = 02 01
* SGN_ALG[2];
* SEAL_ALG[2]
* Filler[2]
* SND_SEQ[2]
* SGN_CKSUM[8]
* Confounder[8]
*/
/*
* WRAP in DCE-style have a fixed size header, the oid and length over
* the WRAP header is a total of
* GSS_ARCFOUR_WRAP_TOKEN_DCE_DER_HEADER_SIZE +
* GSS_ARCFOUR_WRAP_TOKEN_SIZE byte (ie total of 45 bytes overhead,
* remember the 2 bytes from APPL [0] SEQ).
*/
#define GSS_ARCFOUR_WRAP_TOKEN_SIZE 32
#define GSS_ARCFOUR_WRAP_TOKEN_DCE_DER_HEADER_SIZE 13
static krb5_error_code
arcfour_mic_key(krb5_context context, krb5_keyblock *key,
const 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];
memset(T, 0, 4);
cksum_k5.checksum.data = k5_data;
cksum_k5.checksum.length = sizeof(k5_data);
if (key->keytype == KRB5_ENCTYPE_ARCFOUR_HMAC_MD5_56) {
char L40[14] = "fortybits";
memcpy(L40 + 10, T, sizeof(T));
ret = krb5_hmac(context, CKSUMTYPE_RSA_MD5,
L40, 14, 0, key, &cksum_k5);
memset(&k5_data[7], 0xAB, 9);
} else {
ret = krb5_hmac(context, CKSUMTYPE_RSA_MD5,
T, 4, 0, key, &cksum_k5);
}
if (ret)
return ret;
key5.keytype = KRB5_ENCTYPE_ARCFOUR_HMAC_MD5;
key5.keyvalue = cksum_k5.checksum;
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_iov(krb5_context context,
krb5_keyblock *key, unsigned usage,
u_char *sgn_cksum, size_t sgn_cksum_sz,
const u_char *v1, size_t l1,
const void *v2, size_t l2,
const gss_iov_buffer_desc *iov,
int iov_count,
const gss_iov_buffer_desc *padding)
{
Checksum CKSUM;
u_char *ptr;
size_t len;
size_t ofs = 0;
int i;
krb5_crypto crypto;
krb5_error_code ret;
assert(sgn_cksum_sz == 8);
len = l1 + l2;
for (i=0; i < iov_count; i++) {
switch (GSS_IOV_BUFFER_TYPE(iov[i].type)) {
case GSS_IOV_BUFFER_TYPE_DATA:
case GSS_IOV_BUFFER_TYPE_SIGN_ONLY:
break;
default:
continue;
}
len += iov[i].buffer.length;
}
if (padding) {
len += padding->buffer.length;
}
ptr = malloc(len);
if (ptr == NULL)
return ENOMEM;
memcpy(ptr + ofs, v1, l1);
ofs += l1;
memcpy(ptr + ofs, v2, l2);
ofs += l2;
for (i=0; i < iov_count; i++) {
switch (GSS_IOV_BUFFER_TYPE(iov[i].type)) {
case GSS_IOV_BUFFER_TYPE_DATA:
case GSS_IOV_BUFFER_TYPE_SIGN_ONLY:
break;
default:
continue;
}
memcpy(ptr + ofs,
iov[i].buffer.value,
iov[i].buffer.length);
ofs += iov[i].buffer.length;
}
if (padding) {
memcpy(ptr + ofs,
padding->buffer.value,
padding->buffer.length);
ofs += padding->buffer.length;
}
ret = krb5_crypto_init(context, key, 0, &crypto);
if (ret) {
free(ptr);
return ret;
}
ret = krb5_create_checksum(context,
crypto,
usage,
0,
ptr, len,
&CKSUM);
memset(ptr, 0, len);
free(ptr);
if (ret == 0) {
memcpy(sgn_cksum, CKSUM.checksum.data, sgn_cksum_sz);
free_Checksum(&CKSUM);
}
krb5_crypto_destroy(context, crypto);
return ret;
}
static krb5_error_code
arcfour_mic_cksum(krb5_context context,
krb5_keyblock *key, unsigned usage,
u_char *sgn_cksum, size_t sgn_cksum_sz,
const u_char *v1, size_t l1,
const void *v2, size_t l2,
const void *v3, size_t l3)
{
gss_iov_buffer_desc iov;
iov.type = GSS_IOV_BUFFER_TYPE_SIGN_ONLY;
iov.buffer.value = rk_UNCONST(v3);
iov.buffer.length = l3;
return arcfour_mic_cksum_iov(context, key, usage,
sgn_cksum, sgn_cksum_sz,
v1, l1, v2, l2,
&iov, 1, NULL);
}
OM_uint32
_gssapi_get_mic_arcfour(OM_uint32 * minor_status,
const gsskrb5_ctx context_handle,
krb5_context context,
gss_qop_t qop_req,
const gss_buffer_t message_buffer,
gss_buffer_t message_token,
krb5_keyblock *key)
{
krb5_error_code ret;
int32_t seq_number;
size_t len, total_len;
u_char k6_data[16], *p0, *p;
EVP_CIPHER_CTX rc4_key;
_gsskrb5_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;
}
p0 = _gssapi_make_mech_header(message_token->value,
len,
GSS_KRB5_MECHANISM);
p = p0;
*p++ = 0x01; /* TOK_ID */
*p++ = 0x01;
*p++ = 0x11; /* SGN_ALG */
*p++ = 0x00;
*p++ = 0xff; /* Filler */
*p++ = 0xff;
*p++ = 0xff;
*p++ = 0xff;
p = NULL;
ret = arcfour_mic_cksum(context,
key, KRB5_KU_USAGE_SIGN,
p0 + 16, 8, /* SGN_CKSUM */
p0, 8, /* TOK_ID, SGN_ALG, Filer */
message_buffer->value, message_buffer->length,
NULL, 0);
if (ret) {
_gsskrb5_release_buffer(minor_status, message_token);
*minor_status = ret;
return GSS_S_FAILURE;
}
ret = arcfour_mic_key(context, key,
p0 + 16, 8, /* SGN_CKSUM */
k6_data, sizeof(k6_data));
if (ret) {
_gsskrb5_release_buffer(minor_status, message_token);
*minor_status = ret;
return GSS_S_FAILURE;
}
HEIMDAL_MUTEX_lock(&context_handle->ctx_id_mutex);
krb5_auth_con_getlocalseqnumber (context,
context_handle->auth_context,
&seq_number);
p = p0 + 8; /* SND_SEQ */
_gsskrb5_encode_be_om_uint32(seq_number, p);
krb5_auth_con_setlocalseqnumber (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);
EVP_CIPHER_CTX_init(&rc4_key);
EVP_CipherInit_ex(&rc4_key, EVP_rc4(), NULL, k6_data, NULL, 1);
EVP_Cipher(&rc4_key, p, p, 8);
EVP_CIPHER_CTX_cleanup(&rc4_key);
memset(k6_data, 0, sizeof(k6_data));
*minor_status = 0;
return GSS_S_COMPLETE;
}
OM_uint32
_gssapi_verify_mic_arcfour(OM_uint32 * minor_status,
const gsskrb5_ctx context_handle,
krb5_context context,
const gss_buffer_t message_buffer,
const gss_buffer_t token_buffer,
gss_qop_t * qop_state,
krb5_keyblock *key,
const char *type)
{
krb5_error_code ret;
uint32_t seq_number;
OM_uint32 omret;
u_char SND_SEQ[8], cksum_data[8], *p;
char k6_data[16];
int cmp;
if (qop_state)
*qop_state = 0;
p = token_buffer->value;
omret = _gsskrb5_verify_header (&p,
token_buffer->length,
type,
GSS_KRB5_MECHANISM);
if (omret)
return omret;
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;
ret = arcfour_mic_cksum(context,
key, KRB5_KU_USAGE_SIGN,
cksum_data, sizeof(cksum_data),
p - 8, 8,
message_buffer->value, message_buffer->length,
NULL, 0);
if (ret) {
*minor_status = ret;
return GSS_S_FAILURE;
}
ret = arcfour_mic_key(context, key,
cksum_data, sizeof(cksum_data),
k6_data, sizeof(k6_data));
if (ret) {
*minor_status = ret;
return GSS_S_FAILURE;
}
cmp = ct_memcmp(cksum_data, p + 8, 8);
if (cmp) {
*minor_status = 0;
return GSS_S_BAD_MIC;
}
{
EVP_CIPHER_CTX rc4_key;
EVP_CIPHER_CTX_init(&rc4_key);
EVP_CipherInit_ex(&rc4_key, EVP_rc4(), NULL, (void *)k6_data, NULL, 0);
EVP_Cipher(&rc4_key, SND_SEQ, p, 8);
EVP_CIPHER_CTX_cleanup(&rc4_key);
memset(k6_data, 0, sizeof(k6_data));
}
_gsskrb5_decode_be_om_uint32(SND_SEQ, &seq_number);
if (context_handle->more_flags & LOCAL)
cmp = memcmp(&SND_SEQ[4], "\xff\xff\xff\xff", 4);
else
cmp = memcmp(&SND_SEQ[4], "\x00\x00\x00\x00", 4);
memset(SND_SEQ, 0, sizeof(SND_SEQ));
if (cmp != 0) {
*minor_status = 0;
return GSS_S_BAD_MIC;
}
HEIMDAL_MUTEX_lock(&context_handle->ctx_id_mutex);
omret = _gssapi_msg_order_check(context_handle->order, seq_number);
HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex);
if (omret)
return omret;
*minor_status = 0;
return GSS_S_COMPLETE;
}
OM_uint32
_gssapi_wrap_arcfour(OM_uint32 * minor_status,
const gsskrb5_ctx context_handle,
krb5_context context,
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)
{
u_char Klocaldata[16], k6_data[16], *p, *p0;
size_t len, total_len, datalen;
krb5_keyblock Klocal;
krb5_error_code ret;
int32_t seq_number;
if (conf_state)
*conf_state = 0;
datalen = input_message_buffer->length;
if (IS_DCE_STYLE(context_handle)) {
len = GSS_ARCFOUR_WRAP_TOKEN_SIZE;
_gssapi_encap_length(len, &len, &total_len, GSS_KRB5_MECHANISM);
total_len += datalen;
} else {
datalen += 1; /* padding */
len = datalen + GSS_ARCFOUR_WRAP_TOKEN_SIZE;
_gssapi_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;
}
p0 = _gssapi_make_mech_header(output_message_buffer->value,
len,
GSS_KRB5_MECHANISM);
p = p0;
*p++ = 0x02; /* TOK_ID */
*p++ = 0x01;
*p++ = 0x11; /* SGN_ALG */
*p++ = 0x00;
if (conf_req_flag) {
*p++ = 0x10; /* SEAL_ALG */
*p++ = 0x00;
} else {
*p++ = 0xff; /* SEAL_ALG */
*p++ = 0xff;
}
*p++ = 0xff; /* Filler */
*p++ = 0xff;
p = NULL;
HEIMDAL_MUTEX_lock(&context_handle->ctx_id_mutex);
krb5_auth_con_getlocalseqnumber (context,
context_handle->auth_context,
&seq_number);
_gsskrb5_encode_be_om_uint32(seq_number, p0 + 8);
krb5_auth_con_setlocalseqnumber (context,
context_handle->auth_context,
++seq_number);
HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex);
memset (p0 + 8 + 4,
(context_handle->more_flags & LOCAL) ? 0 : 0xff,
4);
krb5_generate_random_block(p0 + 24, 8); /* fill in Confounder */
/* p points to data */
p = p0 + GSS_ARCFOUR_WRAP_TOKEN_SIZE;
memcpy(p, input_message_buffer->value, input_message_buffer->length);
if (!IS_DCE_STYLE(context_handle))
p[input_message_buffer->length] = 1; /* padding */
ret = arcfour_mic_cksum(context,
key, KRB5_KU_USAGE_SEAL,
p0 + 16, 8, /* SGN_CKSUM */
p0, 8, /* TOK_ID, SGN_ALG, SEAL_ALG, Filler */
p0 + 24, 8, /* Confounder */
p0 + GSS_ARCFOUR_WRAP_TOKEN_SIZE,
datalen);
if (ret) {
*minor_status = ret;
_gsskrb5_release_buffer(minor_status, output_message_buffer);
return GSS_S_FAILURE;
}
{
int i;
Klocal.keytype = key->keytype;
Klocal.keyvalue.data = Klocaldata;
Klocal.keyvalue.length = sizeof(Klocaldata);
for (i = 0; i < 16; i++)
Klocaldata[i] = ((u_char *)key->keyvalue.data)[i] ^ 0xF0;
}
ret = arcfour_mic_key(context, &Klocal,
p0 + 8, 4, /* SND_SEQ */
k6_data, sizeof(k6_data));
memset(Klocaldata, 0, sizeof(Klocaldata));
if (ret) {
_gsskrb5_release_buffer(minor_status, output_message_buffer);
*minor_status = ret;
return GSS_S_FAILURE;
}
if(conf_req_flag) {
EVP_CIPHER_CTX rc4_key;
EVP_CIPHER_CTX_init(&rc4_key);
EVP_CipherInit_ex(&rc4_key, EVP_rc4(), NULL, k6_data, NULL, 1);
EVP_Cipher(&rc4_key, p0 + 24, p0 + 24, 8 + datalen);
EVP_CIPHER_CTX_cleanup(&rc4_key);
}
memset(k6_data, 0, sizeof(k6_data));
ret = arcfour_mic_key(context, key,
p0 + 16, 8, /* SGN_CKSUM */
k6_data, sizeof(k6_data));
if (ret) {
_gsskrb5_release_buffer(minor_status, output_message_buffer);
*minor_status = ret;
return GSS_S_FAILURE;
}
{
EVP_CIPHER_CTX rc4_key;
EVP_CIPHER_CTX_init(&rc4_key);
EVP_CipherInit_ex(&rc4_key, EVP_rc4(), NULL, k6_data, NULL, 1);
EVP_Cipher(&rc4_key, p0 + 8, p0 + 8 /* SND_SEQ */, 8);
EVP_CIPHER_CTX_cleanup(&rc4_key);
memset(k6_data, 0, sizeof(k6_data));
}
if (conf_state)
*conf_state = conf_req_flag;
*minor_status = 0;
return GSS_S_COMPLETE;
}
OM_uint32 _gssapi_unwrap_arcfour(OM_uint32 *minor_status,
const gsskrb5_ctx context_handle,
krb5_context context,
const gss_buffer_t input_message_buffer,
gss_buffer_t output_message_buffer,
int *conf_state,
gss_qop_t *qop_state,
krb5_keyblock *key)
{
u_char Klocaldata[16];
krb5_keyblock Klocal;
krb5_error_code ret;
uint32_t seq_number;
size_t datalen;
OM_uint32 omret;
u_char k6_data[16], SND_SEQ[8], Confounder[8];
u_char cksum_data[8];
u_char *p, *p0;
int cmp;
int conf_flag;
size_t padlen = 0, len;
if (conf_state)
*conf_state = 0;
if (qop_state)
*qop_state = 0;
p0 = input_message_buffer->value;
if (IS_DCE_STYLE(context_handle)) {
len = GSS_ARCFOUR_WRAP_TOKEN_SIZE +
GSS_ARCFOUR_WRAP_TOKEN_DCE_DER_HEADER_SIZE;
if (input_message_buffer->length < len)
return GSS_S_BAD_MECH;
} else {
len = input_message_buffer->length;
}
omret = _gssapi_verify_mech_header(&p0,
len,
GSS_KRB5_MECHANISM);
if (omret)
return omret;
/* length of mech header */
len = (p0 - (u_char *)input_message_buffer->value) +
GSS_ARCFOUR_WRAP_TOKEN_SIZE;
if (len > input_message_buffer->length)
return GSS_S_BAD_MECH;
/* length of data */
datalen = input_message_buffer->length - len;
p = p0;
if (memcmp(p, "\x02\x01", 2) != 0)
return GSS_S_BAD_SIG;
p += 2;
if (memcmp(p, "\x11\x00", 2) != 0) /* SGN_ALG = HMAC MD5 ARCFOUR */
return GSS_S_BAD_SIG;
p += 2;
if (memcmp (p, "\x10\x00", 2) == 0)
conf_flag = 1;
else if (memcmp (p, "\xff\xff", 2) == 0)
conf_flag = 0;
else
return GSS_S_BAD_SIG;
p += 2;
if (memcmp (p, "\xff\xff", 2) != 0)
return GSS_S_BAD_MIC;
p = NULL;
ret = arcfour_mic_key(context, key,
p0 + 16, 8, /* SGN_CKSUM */
k6_data, sizeof(k6_data));
if (ret) {
*minor_status = ret;
return GSS_S_FAILURE;
}
{
EVP_CIPHER_CTX rc4_key;
EVP_CIPHER_CTX_init(&rc4_key);
EVP_CipherInit_ex(&rc4_key, EVP_rc4(), NULL, k6_data, NULL, 1);
EVP_Cipher(&rc4_key, SND_SEQ, p0 + 8, 8);
EVP_CIPHER_CTX_cleanup(&rc4_key);
memset(k6_data, 0, sizeof(k6_data));
}
_gsskrb5_decode_be_om_uint32(SND_SEQ, &seq_number);
if (context_handle->more_flags & LOCAL)
cmp = memcmp(&SND_SEQ[4], "\xff\xff\xff\xff", 4);
else
cmp = memcmp(&SND_SEQ[4], "\x00\x00\x00\x00", 4);
if (cmp != 0) {
*minor_status = 0;
return GSS_S_BAD_MIC;
}
{
int i;
Klocal.keytype = key->keytype;
Klocal.keyvalue.data = Klocaldata;
Klocal.keyvalue.length = sizeof(Klocaldata);
for (i = 0; i < 16; i++)
Klocaldata[i] = ((u_char *)key->keyvalue.data)[i] ^ 0xF0;
}
ret = arcfour_mic_key(context, &Klocal,
SND_SEQ, 4,
k6_data, sizeof(k6_data));
memset(Klocaldata, 0, sizeof(Klocaldata));
if (ret) {
*minor_status = ret;
return GSS_S_FAILURE;
}
output_message_buffer->value = malloc(datalen);
if (output_message_buffer->value == NULL) {
*minor_status = ENOMEM;
return GSS_S_FAILURE;
}
output_message_buffer->length = datalen;
if(conf_flag) {
EVP_CIPHER_CTX rc4_key;
EVP_CIPHER_CTX_init(&rc4_key);
EVP_CipherInit_ex(&rc4_key, EVP_rc4(), NULL, k6_data, NULL, 1);
EVP_Cipher(&rc4_key, Confounder, p0 + 24, 8);
EVP_Cipher(&rc4_key, output_message_buffer->value, p0 + GSS_ARCFOUR_WRAP_TOKEN_SIZE, datalen);
EVP_CIPHER_CTX_cleanup(&rc4_key);
} else {
memcpy(Confounder, p0 + 24, 8); /* Confounder */
memcpy(output_message_buffer->value,
p0 + GSS_ARCFOUR_WRAP_TOKEN_SIZE,
datalen);
}
memset(k6_data, 0, sizeof(k6_data));
if (!IS_DCE_STYLE(context_handle)) {
ret = _gssapi_verify_pad(output_message_buffer, datalen, &padlen);
if (ret) {
_gsskrb5_release_buffer(minor_status, output_message_buffer);
*minor_status = 0;
return ret;
}
output_message_buffer->length -= padlen;
}
ret = arcfour_mic_cksum(context,
key, KRB5_KU_USAGE_SEAL,
cksum_data, sizeof(cksum_data),
p0, 8,
Confounder, sizeof(Confounder),
output_message_buffer->value,
output_message_buffer->length + padlen);
if (ret) {
_gsskrb5_release_buffer(minor_status, output_message_buffer);
*minor_status = ret;
return GSS_S_FAILURE;
}
cmp = ct_memcmp(cksum_data, p0 + 16, 8); /* SGN_CKSUM */
if (cmp) {
_gsskrb5_release_buffer(minor_status, output_message_buffer);
*minor_status = 0;
return GSS_S_BAD_MIC;
}
HEIMDAL_MUTEX_lock(&context_handle->ctx_id_mutex);
omret = _gssapi_msg_order_check(context_handle->order, seq_number);
HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex);
if (omret)
return omret;
if (conf_state)
*conf_state = conf_flag;
*minor_status = 0;
return GSS_S_COMPLETE;
}
static OM_uint32
max_wrap_length_arcfour(const gsskrb5_ctx ctx,
krb5_crypto crypto,
size_t input_length,
OM_uint32 *max_input_size)
{
/*
* if GSS_C_DCE_STYLE is in use:
* - we only need to encapsulate the WRAP token
* However, since this is a fixed since, we just
*/
if (IS_DCE_STYLE(ctx)) {
size_t len, total_len;
len = GSS_ARCFOUR_WRAP_TOKEN_SIZE;
_gssapi_encap_length(len, &len, &total_len, GSS_KRB5_MECHANISM);
if (input_length < len)
*max_input_size = 0;
else
*max_input_size = input_length - len;
} else {
size_t extrasize = GSS_ARCFOUR_WRAP_TOKEN_SIZE;
size_t blocksize = 8;
size_t len, total_len;
len = 8 + input_length + blocksize + extrasize;
_gsskrb5_encap_length(len, &len, &total_len, GSS_KRB5_MECHANISM);
total_len -= input_length; /* token length */
if (total_len < input_length) {
*max_input_size = (input_length - total_len);
(*max_input_size) &= (~(OM_uint32)(blocksize - 1));
} else {
*max_input_size = 0;
}
}
return GSS_S_COMPLETE;
}
OM_uint32
_gssapi_wrap_size_arcfour(OM_uint32 *minor_status,
const gsskrb5_ctx ctx,
krb5_context context,
int conf_req_flag,
gss_qop_t qop_req,
OM_uint32 req_output_size,
OM_uint32 *max_input_size,
krb5_keyblock *key)
{
krb5_error_code ret;
krb5_crypto crypto;
ret = krb5_crypto_init(context, key, 0, &crypto);
if (ret != 0) {
*minor_status = ret;
return GSS_S_FAILURE;
}
ret = max_wrap_length_arcfour(ctx, crypto,
req_output_size, max_input_size);
if (ret != 0) {
*minor_status = ret;
krb5_crypto_destroy(context, crypto);
return GSS_S_FAILURE;
}
krb5_crypto_destroy(context, crypto);
return GSS_S_COMPLETE;
}
OM_uint32
_gssapi_wrap_iov_length_arcfour(OM_uint32 *minor_status,
gsskrb5_ctx ctx,
krb5_context context,
int conf_req_flag,
gss_qop_t qop_req,
int *conf_state,
gss_iov_buffer_desc *iov,
int iov_count)
{
OM_uint32 major_status;
size_t data_len = 0;
int i;
gss_iov_buffer_desc *header = NULL;
gss_iov_buffer_desc *padding = NULL;
gss_iov_buffer_desc *trailer = NULL;
*minor_status = 0;
for (i = 0; i < iov_count; i++) {
switch(GSS_IOV_BUFFER_TYPE(iov[i].type)) {
case GSS_IOV_BUFFER_TYPE_EMPTY:
break;
case GSS_IOV_BUFFER_TYPE_DATA:
data_len += iov[i].buffer.length;
break;
case GSS_IOV_BUFFER_TYPE_HEADER:
if (header != NULL) {
*minor_status = EINVAL;
return GSS_S_FAILURE;
}
header = &iov[i];
break;
case GSS_IOV_BUFFER_TYPE_TRAILER:
if (trailer != NULL) {
*minor_status = EINVAL;
return GSS_S_FAILURE;
}
trailer = &iov[i];
break;
case GSS_IOV_BUFFER_TYPE_PADDING:
if (padding != NULL) {
*minor_status = EINVAL;
return GSS_S_FAILURE;
}
padding = &iov[i];
break;
case GSS_IOV_BUFFER_TYPE_SIGN_ONLY:
break;
default:
*minor_status = EINVAL;
return GSS_S_FAILURE;
}
}
major_status = _gk_verify_buffers(minor_status, ctx, header, padding, trailer);
if (major_status != GSS_S_COMPLETE) {
return major_status;
}
if (IS_DCE_STYLE(ctx)) {
size_t len = GSS_ARCFOUR_WRAP_TOKEN_SIZE;
size_t total_len;
_gssapi_encap_length(len, &len, &total_len, GSS_KRB5_MECHANISM);
header->buffer.length = total_len;
} else {
size_t len;
size_t total_len;
if (padding) {
data_len += 1; /* padding */
}
len = data_len + GSS_ARCFOUR_WRAP_TOKEN_SIZE;
_gssapi_encap_length(len, &len, &total_len, GSS_KRB5_MECHANISM);
header->buffer.length = total_len - data_len;
}
if (trailer) {
trailer->buffer.length = 0;
}
if (padding) {
padding->buffer.length = 1;
}
return GSS_S_COMPLETE;
}
OM_uint32
_gssapi_wrap_iov_arcfour(OM_uint32 *minor_status,
gsskrb5_ctx ctx,
krb5_context context,
int conf_req_flag,
int *conf_state,
gss_iov_buffer_desc *iov,
int iov_count,
krb5_keyblock *key)
{
OM_uint32 major_status, junk;
gss_iov_buffer_desc *header, *padding, *trailer;
krb5_error_code kret;
int32_t seq_number;
u_char Klocaldata[16], k6_data[16], *p, *p0;
size_t make_len = 0;
size_t header_len = 0;
size_t data_len = 0;
krb5_keyblock Klocal;
int i;
header = _gk_find_buffer(iov, iov_count, GSS_IOV_BUFFER_TYPE_HEADER);
padding = _gk_find_buffer(iov, iov_count, GSS_IOV_BUFFER_TYPE_PADDING);
trailer = _gk_find_buffer(iov, iov_count, GSS_IOV_BUFFER_TYPE_TRAILER);
major_status = _gk_verify_buffers(minor_status, ctx, header, padding, trailer);
if (major_status != GSS_S_COMPLETE) {
return major_status;
}
for (i = 0; i < iov_count; i++) {
switch (GSS_IOV_BUFFER_TYPE(iov[i].type)) {
case GSS_IOV_BUFFER_TYPE_DATA:
break;
default:
continue;
}
data_len += iov[i].buffer.length;
}
if (padding) {
data_len += 1;
}
if (IS_DCE_STYLE(ctx)) {
size_t unwrapped_len;
unwrapped_len = GSS_ARCFOUR_WRAP_TOKEN_SIZE;
_gssapi_encap_length(unwrapped_len,
&make_len,
&header_len,
GSS_KRB5_MECHANISM);
} else {
size_t unwrapped_len;
unwrapped_len = GSS_ARCFOUR_WRAP_TOKEN_SIZE + data_len;
_gssapi_encap_length(unwrapped_len,
&make_len,
&header_len,
GSS_KRB5_MECHANISM);
header_len -= data_len;
}
if (GSS_IOV_BUFFER_FLAGS(header->type) & GSS_IOV_BUFFER_TYPE_FLAG_ALLOCATE) {
major_status = _gk_allocate_buffer(minor_status, header,
header_len);
if (major_status != GSS_S_COMPLETE)
goto failure;
} else if (header->buffer.length < header_len) {
*minor_status = KRB5_BAD_MSIZE;
major_status = GSS_S_FAILURE;
goto failure;
} else {
header->buffer.length = header_len;
}
if (padding) {
if (GSS_IOV_BUFFER_FLAGS(padding->type) & GSS_IOV_BUFFER_TYPE_FLAG_ALLOCATE) {
major_status = _gk_allocate_buffer(minor_status, padding, 1);
if (major_status != GSS_S_COMPLETE)
goto failure;
} else if (padding->buffer.length < 1) {
*minor_status = KRB5_BAD_MSIZE;
major_status = GSS_S_FAILURE;
goto failure;
} else {
padding->buffer.length = 1;
}
memset(padding->buffer.value, 1, 1);
}
if (trailer) {
trailer->buffer.length = 0;
trailer->buffer.value = NULL;
}
p0 = _gssapi_make_mech_header(header->buffer.value,
make_len,
GSS_KRB5_MECHANISM);
p = p0;
*p++ = 0x02; /* TOK_ID */
*p++ = 0x01;
*p++ = 0x11; /* SGN_ALG */
*p++ = 0x00;
if (conf_req_flag) {
*p++ = 0x10; /* SEAL_ALG */
*p++ = 0x00;
} else {
*p++ = 0xff; /* SEAL_ALG */
*p++ = 0xff;
}
*p++ = 0xff; /* Filler */
*p++ = 0xff;
p = NULL;
HEIMDAL_MUTEX_lock(&ctx->ctx_id_mutex);
krb5_auth_con_getlocalseqnumber(context,
ctx->auth_context,
&seq_number);
_gsskrb5_encode_be_om_uint32(seq_number, p0 + 8);
krb5_auth_con_setlocalseqnumber(context,
ctx->auth_context,
++seq_number);
HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
memset(p0 + 8 + 4,
(ctx->more_flags & LOCAL) ? 0 : 0xff,
4);
krb5_generate_random_block(p0 + 24, 8); /* fill in Confounder */
/* Sign Data */
kret = arcfour_mic_cksum_iov(context,
key, KRB5_KU_USAGE_SEAL,
p0 + 16, 8, /* SGN_CKSUM */
p0, 8, /* TOK_ID, SGN_ALG, SEAL_ALG, Filler */
p0 + 24, 8, /* Confounder */
iov, iov_count, /* Data + SignOnly */
padding); /* padding */
if (kret) {
*minor_status = kret;
major_status = GSS_S_FAILURE;
goto failure;
}
Klocal.keytype = key->keytype;
Klocal.keyvalue.data = Klocaldata;
Klocal.keyvalue.length = sizeof(Klocaldata);
for (i = 0; i < 16; i++) {
Klocaldata[i] = ((u_char *)key->keyvalue.data)[i] ^ 0xF0;
}
kret = arcfour_mic_key(context, &Klocal,
p0 + 8, 4, /* SND_SEQ */
k6_data, sizeof(k6_data));
memset(Klocaldata, 0, sizeof(Klocaldata));
if (kret) {
*minor_status = kret;
major_status = GSS_S_FAILURE;
goto failure;
}
if (conf_req_flag) {
EVP_CIPHER_CTX rc4_key;
EVP_CIPHER_CTX_init(&rc4_key);
EVP_CipherInit_ex(&rc4_key, EVP_rc4(), NULL, k6_data, NULL, 1);
/* Confounder */
EVP_Cipher(&rc4_key, p0 + 24, p0 + 24, 8);
/* Seal Data */
for (i=0; i < iov_count; i++) {
switch (GSS_IOV_BUFFER_TYPE(iov[i].type)) {
case GSS_IOV_BUFFER_TYPE_DATA:
break;
default:
continue;
}
EVP_Cipher(&rc4_key, iov[i].buffer.value,
iov[i].buffer.value, iov[i].buffer.length);
}
/* Padding */
if (padding) {
EVP_Cipher(&rc4_key, padding->buffer.value,
padding->buffer.value, padding->buffer.length);
}
EVP_CIPHER_CTX_cleanup(&rc4_key);
}
memset(k6_data, 0, sizeof(k6_data));
kret = arcfour_mic_key(context, key,
p0 + 16, 8, /* SGN_CKSUM */
k6_data, sizeof(k6_data));
if (kret) {
*minor_status = kret;
major_status = GSS_S_FAILURE;
}
{
EVP_CIPHER_CTX rc4_key;
EVP_CIPHER_CTX_init(&rc4_key);
EVP_CipherInit_ex(&rc4_key, EVP_rc4(), NULL, k6_data, NULL, 1);
EVP_Cipher(&rc4_key, p0 + 8, p0 + 8, 8); /* SND_SEQ */
EVP_CIPHER_CTX_cleanup(&rc4_key);
memset(k6_data, 0, sizeof(k6_data));
}
if (conf_state)
*conf_state = conf_req_flag;
*minor_status = 0;
return GSS_S_COMPLETE;
failure:
gss_release_iov_buffer(&junk, iov, iov_count);
return major_status;
}
OM_uint32
_gssapi_unwrap_iov_arcfour(OM_uint32 *minor_status,
gsskrb5_ctx ctx,
krb5_context context,
int *pconf_state,
gss_qop_t *pqop_state,
gss_iov_buffer_desc *iov,
int iov_count,
krb5_keyblock *key)
{
OM_uint32 major_status;
gss_iov_buffer_desc *header, *padding, *trailer;
krb5_keyblock Klocal;
uint8_t Klocaldata[16];
uint8_t k6_data[16], snd_seq[8], Confounder[8];
uint8_t cksum_data[8];
uint8_t *_p = NULL;
const uint8_t *p, *p0;
size_t verify_len = 0;
uint32_t seq_number;
size_t hlen = 0;
int conf_state;
int cmp;
size_t i;
krb5_error_code kret;
OM_uint32 ret;
if (pconf_state != NULL) {
*pconf_state = 0;
}
if (pqop_state != NULL) {
*pqop_state = 0;
}
header = _gk_find_buffer(iov, iov_count, GSS_IOV_BUFFER_TYPE_HEADER);
padding = _gk_find_buffer(iov, iov_count, GSS_IOV_BUFFER_TYPE_PADDING);
trailer = _gk_find_buffer(iov, iov_count, GSS_IOV_BUFFER_TYPE_TRAILER);
/* Check if the packet is correct */
major_status = _gk_verify_buffers(minor_status,
ctx,
header,
padding,
trailer);
if (major_status != GSS_S_COMPLETE) {
return major_status;
}
if (padding != NULL && padding->buffer.length != 1) {
*minor_status = EINVAL;
return GSS_S_FAILURE;
}
if (IS_DCE_STYLE(context)) {
verify_len = GSS_ARCFOUR_WRAP_TOKEN_SIZE +
GSS_ARCFOUR_WRAP_TOKEN_DCE_DER_HEADER_SIZE;
if (header->buffer.length > verify_len) {
return GSS_S_BAD_MECH;
}
} else {
verify_len = header->buffer.length;
}
_p = header->buffer.value;
ret = _gssapi_verify_mech_header(&_p,
verify_len,
GSS_KRB5_MECHANISM);
if (ret) {
return ret;
}
p0 = _p;
/* length of mech header */
hlen = (p0 - (uint8_t *)header->buffer.value);
hlen += GSS_ARCFOUR_WRAP_TOKEN_SIZE;
if (hlen > header->buffer.length) {
return GSS_S_BAD_MECH;
}
p = p0;
if (memcmp(p, "\x02\x01", 2) != 0)
return GSS_S_BAD_SIG;
p += 2;
if (memcmp(p, "\x11\x00", 2) != 0) /* SGN_ALG = HMAC MD5 ARCFOUR */
return GSS_S_BAD_SIG;
p += 2;
if (memcmp (p, "\x10\x00", 2) == 0)
conf_state = 1;
else if (memcmp (p, "\xff\xff", 2) == 0)
conf_state = 0;
else
return GSS_S_BAD_SIG;
p += 2;
if (memcmp (p, "\xff\xff", 2) != 0)
return GSS_S_BAD_MIC;
p = NULL;
kret = arcfour_mic_key(context,
key,
p0 + 16, /* SGN_CKSUM */
8, /* SGN_CKSUM_LEN */
k6_data,
sizeof(k6_data));
if (kret) {
*minor_status = kret;
return GSS_S_FAILURE;
}
{
EVP_CIPHER_CTX rc4_key;
EVP_CIPHER_CTX_init(&rc4_key);
EVP_CipherInit_ex(&rc4_key, EVP_rc4(), NULL, k6_data, NULL, 1);
EVP_Cipher(&rc4_key, snd_seq, p0 + 8, 8); /* SND_SEQ */
EVP_CIPHER_CTX_cleanup(&rc4_key);
memset(k6_data, 0, sizeof(k6_data));
}
_gsskrb5_decode_be_om_uint32(snd_seq, &seq_number);
if (ctx->more_flags & LOCAL) {
cmp = memcmp(&snd_seq[4], "\xff\xff\xff\xff", 4);
} else {
cmp = memcmp(&snd_seq[4], "\x00\x00\x00\x00", 4);
}
if (cmp != 0) {
*minor_status = 0;
return GSS_S_BAD_MIC;
}
if (ctx->more_flags & LOCAL) {
cmp = memcmp(&snd_seq[4], "\xff\xff\xff\xff", 4);
} else {
cmp = memcmp(&snd_seq[4], "\x00\x00\x00\x00", 4);
}
if (cmp != 0) {
*minor_status = 0;
return GSS_S_BAD_MIC;
}
/* keyblock */
Klocal.keytype = key->keytype;
Klocal.keyvalue.data = Klocaldata;
Klocal.keyvalue.length = sizeof(Klocaldata);
for (i = 0; i < 16; i++) {
Klocaldata[i] = ((u_char *)key->keyvalue.data)[i] ^ 0xF0;
}
kret = arcfour_mic_key(context,
&Klocal,
snd_seq,
4,
k6_data, sizeof(k6_data));
memset(Klocaldata, 0, sizeof(Klocaldata));
if (kret) {
*minor_status = kret;
return GSS_S_FAILURE;
}
if (conf_state == 1) {
EVP_CIPHER_CTX rc4_key;
EVP_CIPHER_CTX_init(&rc4_key);
EVP_CipherInit_ex(&rc4_key, EVP_rc4(), NULL, k6_data, NULL, 1);
/* Confounder */
EVP_Cipher(&rc4_key, Confounder, p0 + 24, 8);
/* Data */
for (i = 0; i < iov_count; i++) {
switch (GSS_IOV_BUFFER_TYPE(iov[i].type)) {
case GSS_IOV_BUFFER_TYPE_DATA:
break;
default:
continue;
}
EVP_Cipher(&rc4_key, iov[i].buffer.value,
iov[i].buffer.value, iov[i].buffer.length);
}
/* Padding */
if (padding) {
EVP_Cipher(&rc4_key, padding->buffer.value,
padding->buffer.value, padding->buffer.length);
}
EVP_CIPHER_CTX_cleanup(&rc4_key);
} else {
/* Confounder */
memcpy(Confounder, p0 + 24, 8);
}
memset(k6_data, 0, sizeof(k6_data));
/* Prepare the buffer for signing */
kret = arcfour_mic_cksum_iov(context,
key, KRB5_KU_USAGE_SEAL,
cksum_data, sizeof(cksum_data),
p0, 8,
Confounder, sizeof(Confounder),
iov, iov_count,
padding);
if (kret) {
*minor_status = kret;
return GSS_S_FAILURE;
}
cmp = memcmp(cksum_data, p0 + 16, 8); /* SGN_CKSUM */
if (cmp != 0) {
*minor_status = 0;
return GSS_S_BAD_MIC;
}
if (padding) {
size_t plen;
ret = _gssapi_verify_pad(&padding->buffer, 1, &plen);
if (ret) {
*minor_status = 0;
return ret;
}
}
HEIMDAL_MUTEX_lock(&ctx->ctx_id_mutex);
ret = _gssapi_msg_order_check(ctx->order, seq_number);
HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
if (ret != 0) {
return ret;
}
if (pconf_state) {
*pconf_state = conf_state;
}
*minor_status = 0;
return GSS_S_COMPLETE;
}
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