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re-organize and add 3DES code

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git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@9004 ec53bebd-3082-4978-b11e-865c3cabbd6b
This commit is contained in:
Assar Westerlund
2000-08-27 04:26:12 +00:00
parent 2662f930e7
commit 8180bca1d4
6 changed files with 1288 additions and 106 deletions
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242
lib/gssapi/krb5/unwrap.c
View File

@@ -37,7 +37,7 @@ RCSID("$Id$");
OM_uint32
gss_krb5_getsomekey(const gss_ctx_id_t context_handle,
des_cblock *key)
krb5_keyblock **key)
{
/* XXX this is ugly, and probably incorrect... */
krb5_keyblock *skey;
@@ -54,18 +54,19 @@ gss_krb5_getsomekey(const gss_ctx_id_t context_handle,
&skey);
if(skey == NULL)
return GSS_S_FAILURE;
memcpy(key, skey->keyvalue.data, sizeof(*key));
krb5_free_keyblock(gssapi_krb5_context, skey);
*key = skey;
return 0;
}
OM_uint32 gss_unwrap
static OM_uint32
unwrap_des
(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
gss_qop_t * qop_state,
krb5_keyblock *key
)
{
u_char *p, *pad;
@@ -73,7 +74,7 @@ OM_uint32 gss_unwrap
MD5_CTX md5;
u_char hash[16], seq_data[8];
des_key_schedule schedule;
des_cblock key;
des_cblock deskey;
des_cblock zero;
int i;
int32_t seq_number;
@@ -109,10 +110,11 @@ OM_uint32 gss_unwrap
if(cstate) {
/* decrypt data */
gss_krb5_getsomekey(context_handle, &key);
for (i = 0; i < sizeof(key); ++i)
key[i] ^= 0xf0;
des_set_key (&key, schedule);
memcpy (&deskey, key->keyvalue.data, sizeof(deskey));
for (i = 0; i < sizeof(deskey); ++i)
deskey[i] ^= 0xf0;
des_set_key (&deskey, schedule);
memset (&zero, 0, sizeof(zero));
des_cbc_encrypt ((void *)p,
(void *)p,
@@ -121,7 +123,7 @@ OM_uint32 gss_unwrap
&zero,
DES_DECRYPT);
memset (key, 0, sizeof(key));
memset (deskey, 0, sizeof(deskey));
memset (schedule, 0, sizeof(schedule));
}
/* check pad */
@@ -140,8 +142,8 @@ OM_uint32 gss_unwrap
MD5Final (hash, &md5);
memset (&zero, 0, sizeof(zero));
gss_krb5_getsomekey(context_handle, &key);
des_set_key (&key, schedule);
memcpy (&deskey, key->keyvalue.data, sizeof(deskey));
des_set_key (&deskey, schedule);
des_cbc_cksum ((void *)hash, (void *)hash, sizeof(hash),
schedule, &zero);
if (memcmp (p - 8, hash, 8) != 0)
@@ -161,11 +163,11 @@ OM_uint32 gss_unwrap
4);
p -= 16;
des_set_key (&key, schedule);
des_set_key (&deskey, schedule);
des_cbc_encrypt ((void *)p, (void *)p, 8,
schedule, (des_cblock *)hash, DES_DECRYPT);
memset (key, 0, sizeof(key));
memset (deskey, 0, sizeof(deskey));
memset (schedule, 0, sizeof(schedule));
if (memcmp (p, seq_data, 8) != 0) {
@@ -179,7 +181,7 @@ OM_uint32 gss_unwrap
/* copy out data */
output_message_buffer->length = input_message_buffer->length
- len - 8 - padlength;
- len - padlength - 8;
output_message_buffer->value = malloc(output_message_buffer->length);
if(output_message_buffer->length != 0 && output_message_buffer->value == NULL)
return GSS_S_FAILURE;
@@ -188,3 +190,211 @@ OM_uint32 gss_unwrap
output_message_buffer->length);
return GSS_S_COMPLETE;
}
static OM_uint32
unwrap_des3
(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
)
{
u_char *p, *pad;
size_t len;
u_char seq[8];
krb5_data seq_data;
u_char cksum[20];
int i;
int32_t seq_number;
size_t padlength;
OM_uint32 ret;
int cstate;
krb5_crypto crypto;
Checksum csum;
int cmp;
p = input_message_buffer->value;
ret = gssapi_krb5_verify_header (&p,
input_message_buffer->length,
"\x02\x01");
if (ret)
return ret;
if (memcmp (p, "\x04\x00", 2) != 0) /* HMAC SHA1 DES3_KD */
return GSS_S_BAD_SIG;
p += 2;
if (memcmp (p, "\x02\x00", 2) == 0) {
cstate = 1;
} else if (memcmp (p, "\xff\xff", 2) == 0) {
cstate = 0;
} else
return GSS_S_BAD_MIC;
p += 2;
if(conf_state != NULL)
*conf_state = cstate;
if (memcmp (p, "\xff\xff", 2) != 0)
return GSS_S_DEFECTIVE_TOKEN;
p += 2;
p += 28;
len = p - (u_char *)input_message_buffer->value;
if(cstate) {
/* decrypt data */
krb5_data tmp;
ret = krb5_crypto_init(gssapi_krb5_context, key,
ETYPE_DES3_CBC_NONE, &crypto);
if (ret) {
*minor_status = ret;
return GSS_S_FAILURE;
}
ret = krb5_decrypt(gssapi_krb5_context, crypto, KRB5_KU_USAGE_SEAL,
p, input_message_buffer->length - len, &tmp);
krb5_crypto_destroy(gssapi_krb5_context, crypto);
if (ret) {
*minor_status = ret;
return GSS_S_FAILURE;
}
assert (tmp.length == input_message_buffer->length - len);
memcpy (p, tmp.data, tmp.length);
krb5_data_free(&tmp);
}
/* check pad */
pad = (u_char *)input_message_buffer->value + input_message_buffer->length - 1;
padlength = *pad;
for (i = padlength; i > 0 && *pad == padlength; i--, pad--)
;
if (i != 0)
return GSS_S_BAD_MIC;
/* verify sequence number */
krb5_auth_getremoteseqnumber (gssapi_krb5_context,
context_handle->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,
(context_handle->more_flags & LOCAL) ? 0xFF : 0,
4);
p -= 28;
ret = krb5_crypto_init(gssapi_krb5_context, key,
ETYPE_DES3_CBC_NONE, &crypto);
if (ret) {
*minor_status = ret;
return GSS_S_FAILURE;
}
ret = krb5_decrypt (gssapi_krb5_context,
crypto,
KRB5_KU_USAGE_SEQ,
p, 8, &seq_data);
krb5_crypto_destroy (gssapi_krb5_context, crypto);
if (ret) {
*minor_status = ret;
return GSS_S_FAILURE;
}
if (seq_data.length != 8) {
krb5_data_free (&seq_data);
return GSS_S_BAD_MIC;
}
cmp = memcmp (seq, seq_data.data, seq_data.length);
krb5_data_free (&seq_data);
if (cmp != 0) {
return GSS_S_BAD_MIC;
}
krb5_auth_setremoteseqnumber (gssapi_krb5_context,
context_handle->auth_context,
++seq_number);
/* verify checksum */
memcpy (cksum, p + 8, 20);
memcpy (p + 20, p - 8, 8);
csum.cksumtype = CKSUMTYPE_HMAC_SHA1_DES3;
csum.checksum.length = 20;
csum.checksum.data = cksum;
ret = krb5_crypto_init(gssapi_krb5_context, key, 0, &crypto);
if (ret) {
*minor_status = ret;
return GSS_S_FAILURE;
}
ret = krb5_verify_checksum (gssapi_krb5_context, crypto,
KRB5_KU_USAGE_SIGN,
p + 20,
input_message_buffer->length - len + 8,
&csum);
krb5_crypto_destroy (gssapi_krb5_context, crypto);
if (ret) {
*minor_status = ret;
return GSS_S_FAILURE;
}
/* copy out data */
output_message_buffer->length = input_message_buffer->length
- len - padlength - 8;
output_message_buffer->value = malloc(output_message_buffer->length);
if(output_message_buffer->length != 0 && output_message_buffer->value == NULL)
return GSS_S_FAILURE;
memcpy (output_message_buffer->value,
p + 36,
output_message_buffer->length);
return GSS_S_COMPLETE;
}
OM_uint32 gss_unwrap
(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 ret;
krb5_keytype keytype;
ret = gss_krb5_getsomekey(context_handle, &key);
if (ret) {
*minor_status = ret;
return GSS_S_FAILURE;
}
krb5_enctype_to_keytype (gssapi_krb5_context, key->keytype, &keytype);
switch (keytype) {
case KEYTYPE_DES :
ret = unwrap_des (minor_status, context_handle,
input_message_buffer, output_message_buffer,
conf_state, qop_state, key);
break;
case KEYTYPE_DES3 :
ret = unwrap_des3 (minor_status, context_handle,
input_message_buffer, output_message_buffer,
conf_state, qop_state, key);
break;
default :
*minor_status = KRB5_PROG_ETYPE_NOSUPP;
ret = GSS_S_FAILURE;
break;
}
krb5_free_keyblock (gssapi_krb5_context, key);
return ret;
}

173
lib/gssapi/krb5/verify_mic.c
View File

@@ -35,20 +35,22 @@
RCSID("$Id$");
OM_uint32 gss_verify_mic
static OM_uint32
verify_mic_des
(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
gss_qop_t * qop_state,
krb5_keyblock *key
)
{
u_char *p;
MD5_CTX md5;
u_char hash[16], seq_data[8];
des_key_schedule schedule;
des_cblock key;
des_cblock zero;
des_cblock deskey;
int32_t seq_number;
OM_uint32 ret;
@@ -75,18 +77,13 @@ OM_uint32 gss_verify_mic
MD5Final (hash, &md5);
memset (&zero, 0, sizeof(zero));
#if 0
memcpy (&key, context_handle->auth_context->key.keyvalue.data,
sizeof(key));
#endif
memcpy (&key, context_handle->auth_context->remote_subkey->keyvalue.data,
sizeof(key));
memcpy (&deskey, key->keyvalue.data, sizeof(deskey));
des_set_key (&key, schedule);
des_set_key (&deskey, schedule);
des_cbc_cksum ((void *)hash, (void *)hash, sizeof(hash),
schedule, &zero);
if (memcmp (p - 8, hash, 8) != 0) {
memset (key, 0, sizeof(key));
memset (deskey, 0, sizeof(deskey));
memset (schedule, 0, sizeof(schedule));
return GSS_S_BAD_MIC;
}
@@ -105,11 +102,11 @@ OM_uint32 gss_verify_mic
4);
p -= 16;
des_set_key (&key, schedule);
des_set_key (&deskey, schedule);
des_cbc_encrypt ((void *)p, (void *)p, 8,
schedule, (des_cblock *)hash, DES_DECRYPT);
memset (key, 0, sizeof(key));
memset (deskey, 0, sizeof(deskey));
memset (schedule, 0, sizeof(schedule));
if (memcmp (p, seq_data, 8) != 0) {
@@ -122,3 +119,153 @@ OM_uint32 gss_verify_mic
return GSS_S_COMPLETE;
}
static OM_uint32
verify_mic_des3
(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,
krb5_keyblock *key
)
{
u_char *p;
u_char seq[8];
int32_t seq_number;
OM_uint32 ret;
krb5_crypto crypto;
krb5_data seq_data;
int cmp;
Checksum csum;
char *tmp;
p = token_buffer->value;
ret = gssapi_krb5_verify_header (&p,
token_buffer->length,
"\x01\x01");
if (ret)
return ret;
if (memcmp(p, "\x04\x00", 2) != 0) /* SGN_ALG = HMAC SHA1 DES3-KD */
return GSS_S_BAD_SIG;
p += 2;
if (memcmp (p, "\xff\xff\xff\xff", 4) != 0)
return GSS_S_BAD_MIC;
p += 4;
ret = krb5_crypto_init(gssapi_krb5_context, key,
ETYPE_DES3_CBC_NONE, &crypto);
if (ret){
*minor_status = ret;
return GSS_S_FAILURE;
}
/* verify sequence number */
ret = krb5_decrypt (gssapi_krb5_context,
crypto,
KRB5_KU_USAGE_SEQ,
p, 8, &seq_data);
if (ret) {
krb5_crypto_destroy (gssapi_krb5_context, crypto);
*minor_status = ret;
return GSS_S_FAILURE;
}
if (seq_data.length != 8) {
krb5_crypto_destroy (gssapi_krb5_context, crypto);
krb5_data_free (&seq_data);
return GSS_S_BAD_MIC;
}
krb5_auth_getremoteseqnumber (gssapi_krb5_context,
context_handle->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,
(context_handle->more_flags & LOCAL) ? 0xFF : 0,
4);
cmp = memcmp (seq, seq_data.data, seq_data.length);
krb5_data_free (&seq_data);
if (cmp != 0) {
krb5_crypto_destroy (gssapi_krb5_context, crypto);
return GSS_S_BAD_MIC;
}
/* verify checksum */
tmp = malloc (message_buffer->length + 8);
if (tmp == NULL) {
krb5_crypto_destroy (gssapi_krb5_context, crypto);
*minor_status = ENOMEM;
return GSS_S_FAILURE;
}
memcpy (tmp, p - 8, 8);
memcpy (tmp + 8, message_buffer->value, message_buffer->length);
csum.cksumtype = CKSUMTYPE_HMAC_SHA1_DES3;
csum.checksum.length = 20;
csum.checksum.data = p + 8;
ret = krb5_verify_checksum (gssapi_krb5_context, crypto,
KRB5_KU_USAGE_SIGN,
tmp, message_buffer->length + 8,
&csum);
free (tmp);
if (ret) {
krb5_crypto_destroy (gssapi_krb5_context, crypto);
*minor_status = ret;
return GSS_S_BAD_MIC;
}
krb5_auth_setremoteseqnumber (gssapi_krb5_context,
context_handle->auth_context,
++seq_number);
krb5_crypto_destroy (gssapi_krb5_context, crypto);
return GSS_S_COMPLETE;
}
OM_uint32
gss_verify_mic
(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
)
{
krb5_keyblock *key;
OM_uint32 ret;
krb5_keytype keytype;
ret = krb5_auth_con_getremotesubkey (gssapi_krb5_context,
context_handle->auth_context,
&key);
if (ret) {
*minor_status = ret;
return GSS_S_FAILURE;
}
krb5_enctype_to_keytype (gssapi_krb5_context, key->keytype, &keytype);
switch (keytype) {
case KEYTYPE_DES :
ret = verify_mic_des (minor_status, context_handle,
message_buffer, token_buffer, qop_state, key);
break;
case KEYTYPE_DES3 :
ret = verify_mic_des3 (minor_status, context_handle,
message_buffer, token_buffer, qop_state, key);
break;
default :
*minor_status = KRB5_PROG_ETYPE_NOSUPP;
ret = GSS_S_FAILURE;
break;
}
krb5_free_keyblock (gssapi_krb5_context, key);
return ret;
}

282
lib/gssapi/krb5/wrap.c
View File

@@ -35,7 +35,24 @@
RCSID("$Id$");
OM_uint32 gss_wrap_size_limit (
static OM_uint32
sub_wrap_size (
OM_uint32 req_output_size,
OM_uint32 * max_input_size,
int blocksize,
int extrasize
)
{
size_t len, total_len, padlength;
padlength = blocksize - (req_output_size % blocksize);
len = req_output_size + 8 + padlength + extrasize;
gssapi_krb5_encap_length(len, &len, &total_len);
*max_input_size = (OM_uint32)total_len;
return GSS_S_COMPLETE;
}
OM_uint32
gss_wrap_size_limit (
OM_uint32 * minor_status,
const gss_ctx_id_t context_handle,
int conf_req_flag,
@@ -44,36 +61,58 @@ OM_uint32 gss_wrap_size_limit (
OM_uint32 * max_input_size
)
{
size_t len, total_len, padlength;
padlength = 8 - (req_output_size % 8);
len = req_output_size + 8 + padlength + 22;
gssapi_krb5_encap_length(len, &len, &total_len);
*max_input_size = (OM_uint32)total_len;
return GSS_S_COMPLETE;
krb5_keyblock *key;
OM_uint32 ret;
krb5_keytype keytype;
ret = gss_krb5_getsomekey(context_handle, &key);
if (ret) {
*minor_status = ret;
return GSS_S_FAILURE;
}
krb5_enctype_to_keytype (gssapi_krb5_context, key->keytype, &keytype);
switch (keytype) {
case KEYTYPE_DES :
ret = sub_wrap_size(req_output_size, max_input_size, 8, 22);
break;
case KEYTYPE_DES3 :
ret = sub_wrap_size(req_output_size, max_input_size, 8, 34);
break;
default :
*minor_status = KRB5_PROG_ETYPE_NOSUPP;
ret = GSS_S_FAILURE;
break;
}
krb5_free_keyblock (gssapi_krb5_context, key);
return ret;
}
OM_uint32 gss_wrap
static OM_uint32
wrap_des
(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
gss_buffer_t output_message_buffer,
krb5_keyblock *key
)
{
u_char *p;
MD5_CTX md5;
u_char hash[16];
des_key_schedule schedule;
des_cblock key;
des_cblock deskey;
des_cblock zero;
int i;
int32_t seq_number;
size_t len, total_len, padlength;
size_t len, total_len, padlength, datalen;
padlength = 8 - (input_message_buffer->length % 8);
len = input_message_buffer->length + 8 + padlength + 22;
datalen = input_message_buffer->length + padlength + 8;
len = datalen + 22;
gssapi_krb5_encap_length (len, &len, &total_len);
output_message_buffer->length = total_len;
@@ -83,8 +122,7 @@ OM_uint32 gss_wrap
p = gssapi_krb5_make_header(output_message_buffer->value,
len,
"\x02\x01");
"\x02\x01"); /* TOK_ID */
/* SGN_ALG */
memcpy (p, "\x00\x00", 2);
@@ -112,12 +150,12 @@ OM_uint32 gss_wrap
/* checksum */
MD5Init (&md5);
MD5Update (&md5, p - 24, 8);
MD5Update (&md5, p, input_message_buffer->length + padlength + 8);
MD5Update (&md5, p, datalen);
MD5Final (hash, &md5);
memset (&zero, 0, sizeof(zero));
gss_krb5_getsomekey(context_handle, &key);
des_set_key (&key, schedule);
memcpy (&deskey, key->keyvalue.data, sizeof(deskey));
des_set_key (&deskey, schedule);
des_cbc_cksum ((void *)hash, (void *)hash, sizeof(hash),
schedule, &zero);
memcpy (p - 8, hash, 8);
@@ -136,7 +174,7 @@ OM_uint32 gss_wrap
(context_handle->more_flags & LOCAL) ? 0 : 0xFF,
4);
des_set_key (&key, schedule);
des_set_key (&deskey, schedule);
des_cbc_encrypt ((void *)p, (void *)p, 8,
schedule, (des_cblock *)(p + 8), DES_ENCRYPT);
@@ -148,22 +186,218 @@ OM_uint32 gss_wrap
p += 16;
if(conf_req_flag) {
gss_krb5_getsomekey(context_handle, &key);
for (i = 0; i < sizeof(key); ++i)
key[i] ^= 0xf0;
des_set_key (&key, schedule);
memcpy (&deskey, key->keyvalue.data, sizeof(deskey));
for (i = 0; i < sizeof(deskey); ++i)
deskey[i] ^= 0xf0;
des_set_key (&deskey, schedule);
memset (&zero, 0, sizeof(zero));
des_cbc_encrypt ((void *)p,
(void *)p,
8 + input_message_buffer->length + padlength,
datalen,
schedule,
&zero,
DES_ENCRYPT);
memset (key, 0, sizeof(key));
memset (deskey, 0, sizeof(deskey));
memset (schedule, 0, sizeof(schedule));
}
if(conf_state != NULL)
*conf_state = conf_req_flag;
return GSS_S_COMPLETE;
}
static OM_uint32
wrap_des3
(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
)
{
u_char *p;
u_char seq[8];
int32_t seq_number;
size_t len, total_len, padlength, datalen;
u_int32_t ret;
krb5_crypto crypto;
Checksum cksum;
krb5_data encdata;
padlength = 8 - (input_message_buffer->length % 8);
datalen = input_message_buffer->length + padlength + 8;
len = datalen + 34;
gssapi_krb5_encap_length (len, &len, &total_len);
output_message_buffer->length = total_len;
output_message_buffer->value = malloc (total_len);
if (output_message_buffer->value == NULL)
return GSS_S_FAILURE;
p = gssapi_krb5_make_header(output_message_buffer->value,
len,
"\x02\x01"); /* TOK_ID */
/* SGN_ALG */
memcpy (p, "\x04\x00", 2); /* HMAC SHA1 DES3-KD */
p += 2;
/* SEAL_ALG */
if(conf_req_flag)
memcpy (p, "\x02\x00", 2); /* DES3-KD */
else
memcpy (p, "\xff\xff", 2);
p += 2;
/* Filler */
memcpy (p, "\xff\xff", 2);
p += 2;
/* calculate checksum (the above + confounder + data + pad) */
memcpy (p + 20, p - 8, 8);
des_new_random_key((des_cblock*)(p + 28));
memcpy (p + 28 + 8, input_message_buffer->value,
input_message_buffer->length);
memset (p + 28 + 8 + input_message_buffer->length, padlength, padlength);
ret = krb5_crypto_init(gssapi_krb5_context, key, 0, &crypto);
if (ret) {
free (output_message_buffer->value);
*minor_status = ret;
return GSS_S_FAILURE;
}
ret = krb5_create_checksum (gssapi_krb5_context,
crypto,
KRB5_KU_USAGE_SIGN,
p + 20,
datalen + 8,
&cksum);
krb5_crypto_destroy (gssapi_krb5_context, crypto);
if (ret) {
free (output_message_buffer->value);
*minor_status = ret;
return GSS_S_FAILURE;
}
/* zero out SND_SEQ + SGN_CKSUM in case */
memset (p, 0, 28);
memcpy (p + 8, cksum.checksum.data, cksum.checksum.length);
free_Checksum (&cksum);
/* sequence number */
krb5_auth_getlocalseqnumber (gssapi_krb5_context,
context_handle->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,
(context_handle->more_flags & LOCAL) ? 0 : 0xFF,
4);
ret = krb5_crypto_init(gssapi_krb5_context, key, ETYPE_DES3_CBC_NONE,
&crypto);
if (ret) {
free (output_message_buffer->value);
*minor_status = ret;
return GSS_S_FAILURE;
}
ret = krb5_encrypt (gssapi_krb5_context,
crypto,
KRB5_KU_USAGE_SEQ,
seq, 8, &encdata);
krb5_crypto_destroy (gssapi_krb5_context, crypto);
if (ret) {
free (output_message_buffer->value);
*minor_status = ret;
return GSS_S_FAILURE;
}
assert (encdata.length == 8);
memcpy (p, encdata.data, encdata.length);
krb5_data_free (&encdata);
krb5_auth_setlocalseqnumber (gssapi_krb5_context,
context_handle->auth_context,
++seq_number);
/* encrypt the data */
p += 28;
if(conf_req_flag) {
krb5_data tmp;
ret = krb5_crypto_init(gssapi_krb5_context, key,
ETYPE_DES3_CBC_NONE, &crypto);
if (ret) {
free (output_message_buffer->value);
*minor_status = ret;
return GSS_S_FAILURE;
}
ret = krb5_encrypt(gssapi_krb5_context, crypto, KRB5_KU_USAGE_SEAL,
p, datalen, &tmp);
krb5_crypto_destroy(gssapi_krb5_context, crypto);
if (ret) {
free (output_message_buffer->value);
*minor_status = ret;
return GSS_S_FAILURE;
}
assert (tmp.length == datalen);
memcpy (p, tmp.data, datalen);
krb5_data_free(&tmp);
}
if(conf_state != NULL)
*conf_state = conf_req_flag;
return GSS_S_COMPLETE;
}
OM_uint32 gss_wrap
(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 ret;
krb5_keytype keytype;
ret = gss_krb5_getsomekey(context_handle, &key);
if (ret) {
*minor_status = ret;
return GSS_S_FAILURE;
}
krb5_enctype_to_keytype (gssapi_krb5_context, key->keytype, &keytype);
switch (keytype) {
case KEYTYPE_DES :
ret = wrap_des (minor_status, context_handle, conf_req_flag,
qop_req, input_message_buffer, conf_state,
output_message_buffer, key);
break;
case KEYTYPE_DES3 :
ret = wrap_des3 (minor_status, context_handle, conf_req_flag,
qop_req, input_message_buffer, conf_state,
output_message_buffer, key);
break;
default :
*minor_status = KRB5_PROG_ETYPE_NOSUPP;
ret = GSS_S_FAILURE;
break;
}
krb5_free_keyblock (gssapi_krb5_context, key);
return ret;
}

242
lib/gssapi/unwrap.c
View File

@@ -37,7 +37,7 @@ RCSID("$Id$");
OM_uint32
gss_krb5_getsomekey(const gss_ctx_id_t context_handle,
des_cblock *key)
krb5_keyblock **key)
{
/* XXX this is ugly, and probably incorrect... */
krb5_keyblock *skey;
@@ -54,18 +54,19 @@ gss_krb5_getsomekey(const gss_ctx_id_t context_handle,
&skey);
if(skey == NULL)
return GSS_S_FAILURE;
memcpy(key, skey->keyvalue.data, sizeof(*key));
krb5_free_keyblock(gssapi_krb5_context, skey);
*key = skey;
return 0;
}
OM_uint32 gss_unwrap
static OM_uint32
unwrap_des
(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
gss_qop_t * qop_state,
krb5_keyblock *key
)
{
u_char *p, *pad;
@@ -73,7 +74,7 @@ OM_uint32 gss_unwrap
MD5_CTX md5;
u_char hash[16], seq_data[8];
des_key_schedule schedule;
des_cblock key;
des_cblock deskey;
des_cblock zero;
int i;
int32_t seq_number;
@@ -109,10 +110,11 @@ OM_uint32 gss_unwrap
if(cstate) {
/* decrypt data */
gss_krb5_getsomekey(context_handle, &key);
for (i = 0; i < sizeof(key); ++i)
key[i] ^= 0xf0;
des_set_key (&key, schedule);
memcpy (&deskey, key->keyvalue.data, sizeof(deskey));
for (i = 0; i < sizeof(deskey); ++i)
deskey[i] ^= 0xf0;
des_set_key (&deskey, schedule);
memset (&zero, 0, sizeof(zero));
des_cbc_encrypt ((void *)p,
(void *)p,
@@ -121,7 +123,7 @@ OM_uint32 gss_unwrap
&zero,
DES_DECRYPT);
memset (key, 0, sizeof(key));
memset (deskey, 0, sizeof(deskey));
memset (schedule, 0, sizeof(schedule));
}
/* check pad */
@@ -140,8 +142,8 @@ OM_uint32 gss_unwrap
MD5Final (hash, &md5);
memset (&zero, 0, sizeof(zero));
gss_krb5_getsomekey(context_handle, &key);
des_set_key (&key, schedule);
memcpy (&deskey, key->keyvalue.data, sizeof(deskey));
des_set_key (&deskey, schedule);
des_cbc_cksum ((void *)hash, (void *)hash, sizeof(hash),
schedule, &zero);
if (memcmp (p - 8, hash, 8) != 0)
@@ -161,11 +163,11 @@ OM_uint32 gss_unwrap
4);
p -= 16;
des_set_key (&key, schedule);
des_set_key (&deskey, schedule);
des_cbc_encrypt ((void *)p, (void *)p, 8,
schedule, (des_cblock *)hash, DES_DECRYPT);
memset (key, 0, sizeof(key));
memset (deskey, 0, sizeof(deskey));
memset (schedule, 0, sizeof(schedule));
if (memcmp (p, seq_data, 8) != 0) {
@@ -179,7 +181,7 @@ OM_uint32 gss_unwrap
/* copy out data */
output_message_buffer->length = input_message_buffer->length
- len - 8 - padlength;
- len - padlength - 8;
output_message_buffer->value = malloc(output_message_buffer->length);
if(output_message_buffer->length != 0 && output_message_buffer->value == NULL)
return GSS_S_FAILURE;
@@ -188,3 +190,211 @@ OM_uint32 gss_unwrap
output_message_buffer->length);
return GSS_S_COMPLETE;
}
static OM_uint32
unwrap_des3
(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
)
{
u_char *p, *pad;
size_t len;
u_char seq[8];
krb5_data seq_data;
u_char cksum[20];
int i;
int32_t seq_number;
size_t padlength;
OM_uint32 ret;
int cstate;
krb5_crypto crypto;
Checksum csum;
int cmp;
p = input_message_buffer->value;
ret = gssapi_krb5_verify_header (&p,
input_message_buffer->length,
"\x02\x01");
if (ret)
return ret;
if (memcmp (p, "\x04\x00", 2) != 0) /* HMAC SHA1 DES3_KD */
return GSS_S_BAD_SIG;
p += 2;
if (memcmp (p, "\x02\x00", 2) == 0) {
cstate = 1;
} else if (memcmp (p, "\xff\xff", 2) == 0) {
cstate = 0;
} else
return GSS_S_BAD_MIC;
p += 2;
if(conf_state != NULL)
*conf_state = cstate;
if (memcmp (p, "\xff\xff", 2) != 0)
return GSS_S_DEFECTIVE_TOKEN;
p += 2;
p += 28;
len = p - (u_char *)input_message_buffer->value;
if(cstate) {
/* decrypt data */
krb5_data tmp;
ret = krb5_crypto_init(gssapi_krb5_context, key,
ETYPE_DES3_CBC_NONE, &crypto);
if (ret) {
*minor_status = ret;
return GSS_S_FAILURE;
}
ret = krb5_decrypt(gssapi_krb5_context, crypto, KRB5_KU_USAGE_SEAL,
p, input_message_buffer->length - len, &tmp);
krb5_crypto_destroy(gssapi_krb5_context, crypto);
if (ret) {
*minor_status = ret;
return GSS_S_FAILURE;
}
assert (tmp.length == input_message_buffer->length - len);
memcpy (p, tmp.data, tmp.length);
krb5_data_free(&tmp);
}
/* check pad */
pad = (u_char *)input_message_buffer->value + input_message_buffer->length - 1;
padlength = *pad;
for (i = padlength; i > 0 && *pad == padlength; i--, pad--)
;
if (i != 0)
return GSS_S_BAD_MIC;
/* verify sequence number */
krb5_auth_getremoteseqnumber (gssapi_krb5_context,
context_handle->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,
(context_handle->more_flags & LOCAL) ? 0xFF : 0,
4);
p -= 28;
ret = krb5_crypto_init(gssapi_krb5_context, key,
ETYPE_DES3_CBC_NONE, &crypto);
if (ret) {
*minor_status = ret;
return GSS_S_FAILURE;
}
ret = krb5_decrypt (gssapi_krb5_context,
crypto,
KRB5_KU_USAGE_SEQ,
p, 8, &seq_data);
krb5_crypto_destroy (gssapi_krb5_context, crypto);
if (ret) {
*minor_status = ret;
return GSS_S_FAILURE;
}
if (seq_data.length != 8) {
krb5_data_free (&seq_data);
return GSS_S_BAD_MIC;
}
cmp = memcmp (seq, seq_data.data, seq_data.length);
krb5_data_free (&seq_data);
if (cmp != 0) {
return GSS_S_BAD_MIC;
}
krb5_auth_setremoteseqnumber (gssapi_krb5_context,
context_handle->auth_context,
++seq_number);
/* verify checksum */
memcpy (cksum, p + 8, 20);
memcpy (p + 20, p - 8, 8);
csum.cksumtype = CKSUMTYPE_HMAC_SHA1_DES3;
csum.checksum.length = 20;
csum.checksum.data = cksum;
ret = krb5_crypto_init(gssapi_krb5_context, key, 0, &crypto);
if (ret) {
*minor_status = ret;
return GSS_S_FAILURE;
}
ret = krb5_verify_checksum (gssapi_krb5_context, crypto,
KRB5_KU_USAGE_SIGN,
p + 20,
input_message_buffer->length - len + 8,
&csum);
krb5_crypto_destroy (gssapi_krb5_context, crypto);
if (ret) {
*minor_status = ret;
return GSS_S_FAILURE;
}
/* copy out data */
output_message_buffer->length = input_message_buffer->length
- len - padlength - 8;
output_message_buffer->value = malloc(output_message_buffer->length);
if(output_message_buffer->length != 0 && output_message_buffer->value == NULL)
return GSS_S_FAILURE;
memcpy (output_message_buffer->value,
p + 36,
output_message_buffer->length);
return GSS_S_COMPLETE;
}
OM_uint32 gss_unwrap
(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 ret;
krb5_keytype keytype;
ret = gss_krb5_getsomekey(context_handle, &key);
if (ret) {
*minor_status = ret;
return GSS_S_FAILURE;
}
krb5_enctype_to_keytype (gssapi_krb5_context, key->keytype, &keytype);
switch (keytype) {
case KEYTYPE_DES :
ret = unwrap_des (minor_status, context_handle,
input_message_buffer, output_message_buffer,
conf_state, qop_state, key);
break;
case KEYTYPE_DES3 :
ret = unwrap_des3 (minor_status, context_handle,
input_message_buffer, output_message_buffer,
conf_state, qop_state, key);
break;
default :
*minor_status = KRB5_PROG_ETYPE_NOSUPP;
ret = GSS_S_FAILURE;
break;
}
krb5_free_keyblock (gssapi_krb5_context, key);
return ret;
}

173
lib/gssapi/verify_mic.c
View File

@@ -35,20 +35,22 @@
RCSID("$Id$");
OM_uint32 gss_verify_mic
static OM_uint32
verify_mic_des
(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
gss_qop_t * qop_state,
krb5_keyblock *key
)
{
u_char *p;
MD5_CTX md5;
u_char hash[16], seq_data[8];
des_key_schedule schedule;
des_cblock key;
des_cblock zero;
des_cblock deskey;
int32_t seq_number;
OM_uint32 ret;
@@ -75,18 +77,13 @@ OM_uint32 gss_verify_mic
MD5Final (hash, &md5);
memset (&zero, 0, sizeof(zero));
#if 0
memcpy (&key, context_handle->auth_context->key.keyvalue.data,
sizeof(key));
#endif
memcpy (&key, context_handle->auth_context->remote_subkey->keyvalue.data,
sizeof(key));
memcpy (&deskey, key->keyvalue.data, sizeof(deskey));
des_set_key (&key, schedule);
des_set_key (&deskey, schedule);
des_cbc_cksum ((void *)hash, (void *)hash, sizeof(hash),
schedule, &zero);
if (memcmp (p - 8, hash, 8) != 0) {
memset (key, 0, sizeof(key));
memset (deskey, 0, sizeof(deskey));
memset (schedule, 0, sizeof(schedule));
return GSS_S_BAD_MIC;
}
@@ -105,11 +102,11 @@ OM_uint32 gss_verify_mic
4);
p -= 16;
des_set_key (&key, schedule);
des_set_key (&deskey, schedule);
des_cbc_encrypt ((void *)p, (void *)p, 8,
schedule, (des_cblock *)hash, DES_DECRYPT);
memset (key, 0, sizeof(key));
memset (deskey, 0, sizeof(deskey));
memset (schedule, 0, sizeof(schedule));
if (memcmp (p, seq_data, 8) != 0) {
@@ -122,3 +119,153 @@ OM_uint32 gss_verify_mic
return GSS_S_COMPLETE;
}
static OM_uint32
verify_mic_des3
(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,
krb5_keyblock *key
)
{
u_char *p;
u_char seq[8];
int32_t seq_number;
OM_uint32 ret;
krb5_crypto crypto;
krb5_data seq_data;
int cmp;
Checksum csum;
char *tmp;
p = token_buffer->value;
ret = gssapi_krb5_verify_header (&p,
token_buffer->length,
"\x01\x01");
if (ret)
return ret;
if (memcmp(p, "\x04\x00", 2) != 0) /* SGN_ALG = HMAC SHA1 DES3-KD */
return GSS_S_BAD_SIG;
p += 2;
if (memcmp (p, "\xff\xff\xff\xff", 4) != 0)
return GSS_S_BAD_MIC;
p += 4;
ret = krb5_crypto_init(gssapi_krb5_context, key,
ETYPE_DES3_CBC_NONE, &crypto);
if (ret){
*minor_status = ret;
return GSS_S_FAILURE;
}
/* verify sequence number */
ret = krb5_decrypt (gssapi_krb5_context,
crypto,
KRB5_KU_USAGE_SEQ,
p, 8, &seq_data);
if (ret) {
krb5_crypto_destroy (gssapi_krb5_context, crypto);
*minor_status = ret;
return GSS_S_FAILURE;
}
if (seq_data.length != 8) {
krb5_crypto_destroy (gssapi_krb5_context, crypto);
krb5_data_free (&seq_data);
return GSS_S_BAD_MIC;
}
krb5_auth_getremoteseqnumber (gssapi_krb5_context,
context_handle->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,
(context_handle->more_flags & LOCAL) ? 0xFF : 0,
4);
cmp = memcmp (seq, seq_data.data, seq_data.length);
krb5_data_free (&seq_data);
if (cmp != 0) {
krb5_crypto_destroy (gssapi_krb5_context, crypto);
return GSS_S_BAD_MIC;
}
/* verify checksum */
tmp = malloc (message_buffer->length + 8);
if (tmp == NULL) {
krb5_crypto_destroy (gssapi_krb5_context, crypto);
*minor_status = ENOMEM;
return GSS_S_FAILURE;
}
memcpy (tmp, p - 8, 8);
memcpy (tmp + 8, message_buffer->value, message_buffer->length);
csum.cksumtype = CKSUMTYPE_HMAC_SHA1_DES3;
csum.checksum.length = 20;
csum.checksum.data = p + 8;
ret = krb5_verify_checksum (gssapi_krb5_context, crypto,
KRB5_KU_USAGE_SIGN,
tmp, message_buffer->length + 8,
&csum);
free (tmp);
if (ret) {
krb5_crypto_destroy (gssapi_krb5_context, crypto);
*minor_status = ret;
return GSS_S_BAD_MIC;
}
krb5_auth_setremoteseqnumber (gssapi_krb5_context,
context_handle->auth_context,
++seq_number);
krb5_crypto_destroy (gssapi_krb5_context, crypto);
return GSS_S_COMPLETE;
}
OM_uint32
gss_verify_mic
(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
)
{
krb5_keyblock *key;
OM_uint32 ret;
krb5_keytype keytype;
ret = krb5_auth_con_getremotesubkey (gssapi_krb5_context,
context_handle->auth_context,
&key);
if (ret) {
*minor_status = ret;
return GSS_S_FAILURE;
}
krb5_enctype_to_keytype (gssapi_krb5_context, key->keytype, &keytype);
switch (keytype) {
case KEYTYPE_DES :
ret = verify_mic_des (minor_status, context_handle,
message_buffer, token_buffer, qop_state, key);
break;
case KEYTYPE_DES3 :
ret = verify_mic_des3 (minor_status, context_handle,
message_buffer, token_buffer, qop_state, key);
break;
default :
*minor_status = KRB5_PROG_ETYPE_NOSUPP;
ret = GSS_S_FAILURE;
break;
}
krb5_free_keyblock (gssapi_krb5_context, key);
return ret;
}

282
lib/gssapi/wrap.c
View File

@@ -35,7 +35,24 @@
RCSID("$Id$");
OM_uint32 gss_wrap_size_limit (
static OM_uint32
sub_wrap_size (
OM_uint32 req_output_size,
OM_uint32 * max_input_size,
int blocksize,
int extrasize
)
{
size_t len, total_len, padlength;
padlength = blocksize - (req_output_size % blocksize);
len = req_output_size + 8 + padlength + extrasize;
gssapi_krb5_encap_length(len, &len, &total_len);
*max_input_size = (OM_uint32)total_len;
return GSS_S_COMPLETE;
}
OM_uint32
gss_wrap_size_limit (
OM_uint32 * minor_status,
const gss_ctx_id_t context_handle,
int conf_req_flag,
@@ -44,36 +61,58 @@ OM_uint32 gss_wrap_size_limit (
OM_uint32 * max_input_size
)
{
size_t len, total_len, padlength;
padlength = 8 - (req_output_size % 8);
len = req_output_size + 8 + padlength + 22;
gssapi_krb5_encap_length(len, &len, &total_len);
*max_input_size = (OM_uint32)total_len;
return GSS_S_COMPLETE;
krb5_keyblock *key;
OM_uint32 ret;
krb5_keytype keytype;
ret = gss_krb5_getsomekey(context_handle, &key);
if (ret) {
*minor_status = ret;
return GSS_S_FAILURE;
}
krb5_enctype_to_keytype (gssapi_krb5_context, key->keytype, &keytype);
switch (keytype) {
case KEYTYPE_DES :
ret = sub_wrap_size(req_output_size, max_input_size, 8, 22);
break;
case KEYTYPE_DES3 :
ret = sub_wrap_size(req_output_size, max_input_size, 8, 34);
break;
default :
*minor_status = KRB5_PROG_ETYPE_NOSUPP;
ret = GSS_S_FAILURE;
break;
}
krb5_free_keyblock (gssapi_krb5_context, key);
return ret;
}
OM_uint32 gss_wrap
static OM_uint32
wrap_des
(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
gss_buffer_t output_message_buffer,
krb5_keyblock *key
)
{
u_char *p;
MD5_CTX md5;
u_char hash[16];
des_key_schedule schedule;
des_cblock key;
des_cblock deskey;
des_cblock zero;
int i;
int32_t seq_number;
size_t len, total_len, padlength;
size_t len, total_len, padlength, datalen;
padlength = 8 - (input_message_buffer->length % 8);
len = input_message_buffer->length + 8 + padlength + 22;
datalen = input_message_buffer->length + padlength + 8;
len = datalen + 22;
gssapi_krb5_encap_length (len, &len, &total_len);
output_message_buffer->length = total_len;
@@ -83,8 +122,7 @@ OM_uint32 gss_wrap
p = gssapi_krb5_make_header(output_message_buffer->value,
len,
"\x02\x01");
"\x02\x01"); /* TOK_ID */
/* SGN_ALG */
memcpy (p, "\x00\x00", 2);
@@ -112,12 +150,12 @@ OM_uint32 gss_wrap
/* checksum */
MD5Init (&md5);
MD5Update (&md5, p - 24, 8);
MD5Update (&md5, p, input_message_buffer->length + padlength + 8);
MD5Update (&md5, p, datalen);
MD5Final (hash, &md5);
memset (&zero, 0, sizeof(zero));
gss_krb5_getsomekey(context_handle, &key);
des_set_key (&key, schedule);
memcpy (&deskey, key->keyvalue.data, sizeof(deskey));
des_set_key (&deskey, schedule);
des_cbc_cksum ((void *)hash, (void *)hash, sizeof(hash),
schedule, &zero);
memcpy (p - 8, hash, 8);
@@ -136,7 +174,7 @@ OM_uint32 gss_wrap
(context_handle->more_flags & LOCAL) ? 0 : 0xFF,
4);
des_set_key (&key, schedule);
des_set_key (&deskey, schedule);
des_cbc_encrypt ((void *)p, (void *)p, 8,
schedule, (des_cblock *)(p + 8), DES_ENCRYPT);
@@ -148,22 +186,218 @@ OM_uint32 gss_wrap
p += 16;
if(conf_req_flag) {
gss_krb5_getsomekey(context_handle, &key);
for (i = 0; i < sizeof(key); ++i)
key[i] ^= 0xf0;
des_set_key (&key, schedule);
memcpy (&deskey, key->keyvalue.data, sizeof(deskey));
for (i = 0; i < sizeof(deskey); ++i)
deskey[i] ^= 0xf0;
des_set_key (&deskey, schedule);
memset (&zero, 0, sizeof(zero));
des_cbc_encrypt ((void *)p,
(void *)p,
8 + input_message_buffer->length + padlength,
datalen,
schedule,
&zero,
DES_ENCRYPT);
memset (key, 0, sizeof(key));
memset (deskey, 0, sizeof(deskey));
memset (schedule, 0, sizeof(schedule));
}
if(conf_state != NULL)
*conf_state = conf_req_flag;
return GSS_S_COMPLETE;
}
static OM_uint32
wrap_des3
(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
)
{
u_char *p;
u_char seq[8];
int32_t seq_number;
size_t len, total_len, padlength, datalen;
u_int32_t ret;
krb5_crypto crypto;
Checksum cksum;
krb5_data encdata;
padlength = 8 - (input_message_buffer->length % 8);
datalen = input_message_buffer->length + padlength + 8;
len = datalen + 34;
gssapi_krb5_encap_length (len, &len, &total_len);
output_message_buffer->length = total_len;
output_message_buffer->value = malloc (total_len);
if (output_message_buffer->value == NULL)
return GSS_S_FAILURE;
p = gssapi_krb5_make_header(output_message_buffer->value,
len,
"\x02\x01"); /* TOK_ID */
/* SGN_ALG */
memcpy (p, "\x04\x00", 2); /* HMAC SHA1 DES3-KD */
p += 2;
/* SEAL_ALG */
if(conf_req_flag)
memcpy (p, "\x02\x00", 2); /* DES3-KD */
else
memcpy (p, "\xff\xff", 2);
p += 2;
/* Filler */
memcpy (p, "\xff\xff", 2);
p += 2;
/* calculate checksum (the above + confounder + data + pad) */
memcpy (p + 20, p - 8, 8);
des_new_random_key((des_cblock*)(p + 28));
memcpy (p + 28 + 8, input_message_buffer->value,
input_message_buffer->length);
memset (p + 28 + 8 + input_message_buffer->length, padlength, padlength);
ret = krb5_crypto_init(gssapi_krb5_context, key, 0, &crypto);
if (ret) {
free (output_message_buffer->value);
*minor_status = ret;
return GSS_S_FAILURE;
}
ret = krb5_create_checksum (gssapi_krb5_context,
crypto,
KRB5_KU_USAGE_SIGN,
p + 20,
datalen + 8,
&cksum);
krb5_crypto_destroy (gssapi_krb5_context, crypto);
if (ret) {
free (output_message_buffer->value);
*minor_status = ret;
return GSS_S_FAILURE;
}
/* zero out SND_SEQ + SGN_CKSUM in case */
memset (p, 0, 28);
memcpy (p + 8, cksum.checksum.data, cksum.checksum.length);
free_Checksum (&cksum);
/* sequence number */
krb5_auth_getlocalseqnumber (gssapi_krb5_context,
context_handle->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,
(context_handle->more_flags & LOCAL) ? 0 : 0xFF,
4);
ret = krb5_crypto_init(gssapi_krb5_context, key, ETYPE_DES3_CBC_NONE,
&crypto);
if (ret) {
free (output_message_buffer->value);
*minor_status = ret;
return GSS_S_FAILURE;
}
ret = krb5_encrypt (gssapi_krb5_context,
crypto,
KRB5_KU_USAGE_SEQ,
seq, 8, &encdata);
krb5_crypto_destroy (gssapi_krb5_context, crypto);
if (ret) {
free (output_message_buffer->value);
*minor_status = ret;
return GSS_S_FAILURE;
}
assert (encdata.length == 8);
memcpy (p, encdata.data, encdata.length);
krb5_data_free (&encdata);
krb5_auth_setlocalseqnumber (gssapi_krb5_context,
context_handle->auth_context,
++seq_number);
/* encrypt the data */
p += 28;
if(conf_req_flag) {
krb5_data tmp;
ret = krb5_crypto_init(gssapi_krb5_context, key,
ETYPE_DES3_CBC_NONE, &crypto);
if (ret) {
free (output_message_buffer->value);
*minor_status = ret;
return GSS_S_FAILURE;
}
ret = krb5_encrypt(gssapi_krb5_context, crypto, KRB5_KU_USAGE_SEAL,
p, datalen, &tmp);
krb5_crypto_destroy(gssapi_krb5_context, crypto);
if (ret) {
free (output_message_buffer->value);
*minor_status = ret;
return GSS_S_FAILURE;
}
assert (tmp.length == datalen);
memcpy (p, tmp.data, datalen);
krb5_data_free(&tmp);
}
if(conf_state != NULL)
*conf_state = conf_req_flag;
return GSS_S_COMPLETE;
}
OM_uint32 gss_wrap
(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 ret;
krb5_keytype keytype;
ret = gss_krb5_getsomekey(context_handle, &key);
if (ret) {
*minor_status = ret;
return GSS_S_FAILURE;
}
krb5_enctype_to_keytype (gssapi_krb5_context, key->keytype, &keytype);
switch (keytype) {
case KEYTYPE_DES :
ret = wrap_des (minor_status, context_handle, conf_req_flag,
qop_req, input_message_buffer, conf_state,
output_message_buffer, key);
break;
case KEYTYPE_DES3 :
ret = wrap_des3 (minor_status, context_handle, conf_req_flag,
qop_req, input_message_buffer, conf_state,
output_message_buffer, key);
break;
default :
*minor_status = KRB5_PROG_ETYPE_NOSUPP;
ret = GSS_S_FAILURE;
break;
}
krb5_free_keyblock (gssapi_krb5_context, key);
return ret;
}