#include "gsskrb5_locl.h"
#ifdef HEIM_KRB5_DES
static OM_uint32
mic_des
(OM_uint32 * minor_status,
const gsskrb5_ctx ctx,
krb5_context context,
gss_qop_t qop_req,
const gss_buffer_t message_buffer,
gss_buffer_t message_token,
krb5_keyblock *key
)
{
u_char *p;
CCDigestRef md5;
u_char hash[16];
DES_key_schedule schedule;
EVP_CIPHER_CTX des_ctx;
DES_cblock deskey;
DES_cblock zero;
int32_t seq_number;
size_t len, total_len;
_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) {
message_token->length = 0;
*minor_status = ENOMEM;
return GSS_S_FAILURE;
}
p = _gsskrb5_make_header(message_token->value,
len,
"\x01\x01",
GSS_KRB5_MECHANISM);
memcpy (p, "\x00\x00", 2);
p += 2;
memcpy (p, "\xff\xff\xff\xff", 4);
p += 4;
memset (p, 0, 16);
p += 16;
md5 = CCDigestCreate(kCCDigestMD5);
CCDigestUpdate(md5, p - 24, 8);
CCDigestUpdate(md5, message_buffer->value, message_buffer->length);
CCDigestFinal(md5, hash);
CCDigestDestroy(md5);
memset (&zero, 0, sizeof(zero));
memcpy (&deskey, key->keyvalue.data, sizeof(deskey));
#ifndef __APPLE_PRIVATE__
DES_set_key_unchecked (&deskey, &schedule);
DES_cbc_cksum ((void *)hash, (void *)hash, sizeof(hash),
&schedule, &zero);
#else
CCDesCBCCksum(hash, hash, sizeof(hash), deskey, sizeof(deskey), &zero);
#endif
memcpy (p - 8, hash, 8);
HEIMDAL_MUTEX_lock(&ctx->ctx_id_mutex);
krb5_auth_con_getlocalseqnumber (context,
ctx->auth_context,
&seq_number);
p -= 16;
p[0] = (seq_number >> 0) & 0xFF;
p[1] = (seq_number >> 8) & 0xFF;
p[2] = (seq_number >> 16) & 0xFF;
p[3] = (seq_number >> 24) & 0xFF;
memset (p + 4,
(ctx->more_flags & LOCAL) ? 0 : 0xFF,
4);
EVP_CIPHER_CTX_init(&des_ctx);
EVP_CipherInit_ex(&des_ctx, EVP_des_cbc(), NULL, key->keyvalue.data, p + 8, 1);
EVP_Cipher(&des_ctx, p, p, 8);
EVP_CIPHER_CTX_cleanup(&des_ctx);
krb5_auth_con_setlocalseqnumber (context,
ctx->auth_context,
++seq_number);
HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
memset (deskey, 0, sizeof(deskey));
memset (&schedule, 0, sizeof(schedule));
*minor_status = 0;
return GSS_S_COMPLETE;
}
#endif
#ifdef HEIM_KRB5_DES3
static OM_uint32
mic_des3
(OM_uint32 * minor_status,
const gsskrb5_ctx ctx,
krb5_context context,
gss_qop_t qop_req,
const gss_buffer_t message_buffer,
gss_buffer_t message_token,
krb5_keyblock *key
)
{
u_char *p;
Checksum cksum;
u_char seq[8];
int32_t seq_number;
size_t len, total_len;
krb5_crypto crypto;
krb5_error_code kret;
krb5_data encdata;
char *tmp;
char ivec[8];
_gsskrb5_encap_length (36, &len, &total_len, GSS_KRB5_MECHANISM);
message_token->length = total_len;
message_token->value = malloc (total_len);
if (message_token->value == NULL) {
message_token->length = 0;
*minor_status = ENOMEM;
return GSS_S_FAILURE;
}
p = _gsskrb5_make_header(message_token->value,
len,
"\x01\x01",
GSS_KRB5_MECHANISM);
memcpy (p, "\x04\x00", 2);
p += 2;
memcpy (p, "\xff\xff\xff\xff", 4);
p += 4;
tmp = malloc (message_buffer->length + 8);
if (tmp == NULL) {
free (message_token->value);
message_token->value = NULL;
message_token->length = 0;
*minor_status = ENOMEM;
return GSS_S_FAILURE;
}
memcpy (tmp, p - 8, 8);
memcpy (tmp + 8, message_buffer->value, message_buffer->length);
kret = krb5_crypto_init(context, key, 0, &crypto);
if (kret) {
free (message_token->value);
message_token->value = NULL;
message_token->length = 0;
free (tmp);
*minor_status = kret;
return GSS_S_FAILURE;
}
kret = krb5_create_checksum (context,
crypto,
KRB5_KU_USAGE_SIGN,
0,
tmp,
message_buffer->length + 8,
&cksum);
free (tmp);
krb5_crypto_destroy (context, crypto);
if (kret) {
free (message_token->value);
message_token->value = NULL;
message_token->length = 0;
*minor_status = kret;
return GSS_S_FAILURE;
}
memcpy (p + 8, cksum.checksum.data, cksum.checksum.length);
HEIMDAL_MUTEX_lock(&ctx->ctx_id_mutex);
krb5_auth_con_getlocalseqnumber (context,
ctx->auth_context,
&seq_number);
seq[0] = (seq_number >> 0) & 0xFF;
seq[1] = (seq_number >> 8) & 0xFF;
seq[2] = (seq_number >> 16) & 0xFF;
seq[3] = (seq_number >> 24) & 0xFF;
memset (seq + 4,
(ctx->more_flags & LOCAL) ? 0 : 0xFF,
4);
kret = krb5_crypto_init(context, key,
ETYPE_DES3_CBC_NONE, &crypto);
if (kret) {
free (message_token->value);
message_token->value = NULL;
message_token->length = 0;
*minor_status = kret;
return GSS_S_FAILURE;
}
if (ctx->more_flags & COMPAT_OLD_DES3)
memset(ivec, 0, 8);
else
memcpy(ivec, p + 8, 8);
kret = krb5_encrypt_ivec (context,
crypto,
KRB5_KU_USAGE_SEQ,
seq, 8, &encdata, ivec);
krb5_crypto_destroy (context, crypto);
if (kret) {
free (message_token->value);
message_token->value = NULL;
message_token->length = 0;
*minor_status = kret;
return GSS_S_FAILURE;
}
assert (encdata.length == 8);
memcpy (p, encdata.data, encdata.length);
krb5_data_free (&encdata);
krb5_auth_con_setlocalseqnumber (context,
ctx->auth_context,
++seq_number);
HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
free_Checksum (&cksum);
*minor_status = 0;
return GSS_S_COMPLETE;
}
#endif
OM_uint32 GSSAPI_CALLCONV _gsskrb5_get_mic
(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_context context;
const gsskrb5_ctx ctx = (const gsskrb5_ctx) context_handle;
krb5_keyblock *key;
OM_uint32 ret;
GSSAPI_KRB5_INIT (&context);
if (ctx->more_flags & IS_CFX)
return _gssapi_mic_cfx (minor_status, &ctx->gk5c, context, qop_req,
message_buffer, message_token);
HEIMDAL_MUTEX_lock(&ctx->ctx_id_mutex);
ret = _gsskrb5i_get_token_key(ctx, context, &key);
HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
if (ret) {
*minor_status = ret;
return GSS_S_FAILURE;
}
switch (key->keytype) {
#ifdef HEIM_KRB5_DES
case KRB5_ENCTYPE_DES_CBC_CRC :
case KRB5_ENCTYPE_DES_CBC_MD4 :
case KRB5_ENCTYPE_DES_CBC_MD5 :
ret = mic_des (minor_status, ctx, context, qop_req,
message_buffer, message_token, key);
break;
#endif
#ifdef HEIM_KRB5_DES3
case KRB5_ENCTYPE_DES3_CBC_MD5 :
case KRB5_ENCTYPE_DES3_CBC_SHA1 :
ret = mic_des3 (minor_status, ctx, context, qop_req,
message_buffer, message_token, key);
break;
#endif
#ifdef HEIM_KRB5_ARCFOUR
case KRB5_ENCTYPE_ARCFOUR_HMAC_MD5:
case KRB5_ENCTYPE_ARCFOUR_HMAC_MD5_56:
ret = _gssapi_get_mic_arcfour (minor_status, ctx, context, qop_req,
message_buffer, message_token, key);
break;
#endif
default :
ret = GSS_S_FAILURE;
break;
}
krb5_free_keyblock (context, key);
return ret;
}