Commit 99455153 authored by David Howells's avatar David Howells Committed by David S. Miller
Browse files

RxRPC: Parse security index 5 keys (Kerberos 5) 



Parse RxRPC security index 5 type keys (Kerberos 5 tokens).

Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent ed6dd18b

include/keys/rxrpc-type.h

+52 −0
Original line number Diff line number Diff line
@@ -35,6 +35,54 @@ struct rxkad_key { 
	u8	ticket[0];		/* the encrypted ticket */

};



/*

 * Kerberos 5 principal

 *	name/name/name@realm

 */

struct krb5_principal {

	u8	n_name_parts;		/* N of parts of the name part of the principal */

	char	**name_parts;		/* parts of the name part of the principal */

	char	*realm;			/* parts of the realm part of the principal */

};



/*

 * Kerberos 5 tagged data

 */

struct krb5_tagged_data {

	/* for tag value, see /usr/include/krb5/krb5.h

	 * - KRB5_AUTHDATA_* for auth data

	 * - 

	 */

	int32_t		tag;

	uint32_t	data_len;

	u8		*data;

};



/*

 * RxRPC key for Kerberos V (type-5 security)

 */

struct rxk5_key {

	uint64_t		authtime;	/* time at which auth token generated */

	uint64_t		starttime;	/* time at which auth token starts */

	uint64_t		endtime;	/* time at which auth token expired */

	uint64_t		renew_till;	/* time to which auth token can be renewed */

	int32_t			is_skey;	/* T if ticket is encrypted in another ticket's

						 * skey */

	int32_t			flags;		/* mask of TKT_FLG_* bits (krb5/krb5.h) */

	struct krb5_principal	client;		/* client principal name */

	struct krb5_principal	server;		/* server principal name */

	uint16_t		ticket_len;	/* length of ticket */

	uint16_t		ticket2_len;	/* length of second ticket */

	u8			n_authdata;	/* number of authorisation data elements */

	u8			n_addresses;	/* number of addresses */

	struct krb5_tagged_data	session;	/* session data; tag is enctype */

	struct krb5_tagged_data *addresses;	/* addresses */

	u8			*ticket;	/* krb5 ticket */

	u8			*ticket2;	/* second krb5 ticket, if related to ticket (via

						 * DUPLICATE-SKEY or ENC-TKT-IN-SKEY) */

	struct krb5_tagged_data *authdata;	/* authorisation data */

};



/*

 * list of tokens attached to an rxrpc key

 */
@@ -43,6 +91,7 @@ struct rxrpc_key_token { 
	struct rxrpc_key_token *next;	/* the next token in the list */

	union {

		struct rxkad_key *kad;

		struct rxk5_key *k5;

	};

};
@@ -64,8 +113,11 @@ struct rxrpc_key_data_v1 { 
 * - based on openafs-1.4.10/src/auth/afs_token.xg

 */

#define AFSTOKEN_LENGTH_MAX		16384	/* max payload size */

#define AFSTOKEN_STRING_MAX		256	/* max small string length */

#define AFSTOKEN_DATA_MAX		64	/* max small data length */

#define AFSTOKEN_CELL_MAX		64	/* max cellname length */

#define AFSTOKEN_MAX			8	/* max tokens per payload */

#define AFSTOKEN_BDATALN_MAX		16384	/* max big data length */

#define AFSTOKEN_RK_TIX_MAX		12000	/* max RxKAD ticket size */

#define AFSTOKEN_GK_KEY_MAX		64	/* max GSSAPI key size */

#define AFSTOKEN_GK_TOKEN_MAX		16384	/* max GSSAPI token size */

net/rxrpc/ar-key.c

+537 −40
Original line number Diff line number Diff line
@@ -64,7 +64,7 @@ struct key_type key_type_rxrpc_s = { 
static int rxrpc_instantiate_xdr_rxkad(struct key *key, const __be32 *xdr,

				       unsigned toklen)

{

	struct rxrpc_key_token *token;

	struct rxrpc_key_token *token, **pptoken;

	size_t plen;

	u32 tktlen;

	int ret;
@@ -129,8 +129,11 @@ static int rxrpc_instantiate_xdr_rxkad(struct key *key, const __be32 *xdr, 
	key->type_data.x[0]++;



	/* attach the data */

	token->next = key->payload.data;

	key->payload.data = token;

	for (pptoken = (struct rxrpc_key_token **)&key->payload.data;

	     *pptoken;

	     pptoken = &(*pptoken)->next)

		continue;

	*pptoken = token;

	if (token->kad->expiry < key->expiry)

		key->expiry = token->kad->expiry;
@@ -138,6 +141,388 @@ static int rxrpc_instantiate_xdr_rxkad(struct key *key, const __be32 *xdr, 
	return 0;

}



static void rxrpc_free_krb5_principal(struct krb5_principal *princ)

{

	int loop;



	if (princ->name_parts) {

		for (loop = princ->n_name_parts - 1; loop >= 0; loop--)

			kfree(princ->name_parts[loop]);

		kfree(princ->name_parts);

	}

	kfree(princ->realm);

}



static void rxrpc_free_krb5_tagged(struct krb5_tagged_data *td)

{

	kfree(td->data);

}



/*

 * free up an RxK5 token

 */

static void rxrpc_rxk5_free(struct rxk5_key *rxk5)

{

	int loop;



	rxrpc_free_krb5_principal(&rxk5->client);

	rxrpc_free_krb5_principal(&rxk5->server);

	rxrpc_free_krb5_tagged(&rxk5->session);



	if (rxk5->addresses) {

		for (loop = rxk5->n_addresses - 1; loop >= 0; loop--)

			rxrpc_free_krb5_tagged(&rxk5->addresses[loop]);

		kfree(rxk5->addresses);

	}

	if (rxk5->authdata) {

		for (loop = rxk5->n_authdata - 1; loop >= 0; loop--)

			rxrpc_free_krb5_tagged(&rxk5->authdata[loop]);

		kfree(rxk5->authdata);

	}



	kfree(rxk5->ticket);

	kfree(rxk5->ticket2);

	kfree(rxk5);

}



/*

 * extract a krb5 principal

 */

static int rxrpc_krb5_decode_principal(struct krb5_principal *princ,

				       const __be32 **_xdr,

				       unsigned *_toklen)

{

	const __be32 *xdr = *_xdr;

	unsigned toklen = *_toklen, n_parts, loop, tmp;



	/* there must be at least one name, and at least #names+1 length

	 * words */

	if (toklen <= 12)

		return -EINVAL;



	_enter(",{%x,%x,%x},%u",

	       ntohl(xdr[0]), ntohl(xdr[1]), ntohl(xdr[2]), toklen);



	n_parts = ntohl(*xdr++);

	toklen -= 4;

	if (n_parts <= 0 || n_parts > AFSTOKEN_K5_COMPONENTS_MAX)

		return -EINVAL;

	princ->n_name_parts = n_parts;



	if (toklen <= (n_parts + 1) * 4)

		return -EINVAL;



	princ->name_parts = kcalloc(sizeof(char *), n_parts, GFP_KERNEL);

	if (!princ->name_parts)

		return -ENOMEM;



	for (loop = 0; loop < n_parts; loop++) {

		if (toklen < 4)

			return -EINVAL;

		tmp = ntohl(*xdr++);

		toklen -= 4;

		if (tmp <= 0 || tmp > AFSTOKEN_STRING_MAX)

			return -EINVAL;

		if (tmp > toklen)

			return -EINVAL;

		princ->name_parts[loop] = kmalloc(tmp + 1, GFP_KERNEL);

		if (!princ->name_parts[loop])

			return -ENOMEM;

		memcpy(princ->name_parts[loop], xdr, tmp);

		princ->name_parts[loop][tmp] = 0;

		tmp = (tmp + 3) & ~3;

		toklen -= tmp;

		xdr += tmp >> 2;

	}



	if (toklen < 4)

		return -EINVAL;

	tmp = ntohl(*xdr++);

	toklen -= 4;

	if (tmp <= 0 || tmp > AFSTOKEN_K5_REALM_MAX)

		return -EINVAL;

	if (tmp > toklen)

		return -EINVAL;

	princ->realm = kmalloc(tmp + 1, GFP_KERNEL);

	if (!princ->realm)

		return -ENOMEM;

	memcpy(princ->realm, xdr, tmp);

	princ->realm[tmp] = 0;

	tmp = (tmp + 3) & ~3;

	toklen -= tmp;

	xdr += tmp >> 2;



	_debug("%s/...@%s", princ->name_parts[0], princ->realm);



	*_xdr = xdr;

	*_toklen = toklen;

	_leave(" = 0 [toklen=%u]", toklen);

	return 0;

}



/*

 * extract a piece of krb5 tagged data

 */

static int rxrpc_krb5_decode_tagged_data(struct krb5_tagged_data *td,

					 size_t max_data_size,

					 const __be32 **_xdr,

					 unsigned *_toklen)

{

	const __be32 *xdr = *_xdr;

	unsigned toklen = *_toklen, len;



	/* there must be at least one tag and one length word */

	if (toklen <= 8)

		return -EINVAL;



	_enter(",%zu,{%x,%x},%u",

	       max_data_size, ntohl(xdr[0]), ntohl(xdr[1]), toklen);



	td->tag = ntohl(*xdr++);

	len = ntohl(*xdr++);

	toklen -= 8;

	if (len > max_data_size)

		return -EINVAL;

	td->data_len = len;



	if (len > 0) {

		td->data = kmalloc(len, GFP_KERNEL);

		if (!td->data)

			return -ENOMEM;

		memcpy(td->data, xdr, len);

		len = (len + 3) & ~3;

		toklen -= len;

		xdr += len >> 2;

	}



	_debug("tag %x len %x", td->tag, td->data_len);



	*_xdr = xdr;

	*_toklen = toklen;

	_leave(" = 0 [toklen=%u]", toklen);

	return 0;

}



/*

 * extract an array of tagged data

 */

static int rxrpc_krb5_decode_tagged_array(struct krb5_tagged_data **_td,

					  u8 *_n_elem,

					  u8 max_n_elem,

					  size_t max_elem_size,

					  const __be32 **_xdr,

					  unsigned *_toklen)

{

	struct krb5_tagged_data *td;

	const __be32 *xdr = *_xdr;

	unsigned toklen = *_toklen, n_elem, loop;

	int ret;



	/* there must be at least one count */

	if (toklen < 4)

		return -EINVAL;



	_enter(",,%u,%zu,{%x},%u",

	       max_n_elem, max_elem_size, ntohl(xdr[0]), toklen);



	n_elem = ntohl(*xdr++);

	toklen -= 4;

	if (n_elem < 0 || n_elem > max_n_elem)

		return -EINVAL;

	*_n_elem = n_elem;

	if (n_elem > 0) {

		if (toklen <= (n_elem + 1) * 4)

			return -EINVAL;



		_debug("n_elem %d", n_elem);



		td = kcalloc(sizeof(struct krb5_tagged_data), n_elem,

			     GFP_KERNEL);

		if (!td)

			return -ENOMEM;

		*_td = td;



		for (loop = 0; loop < n_elem; loop++) {

			ret = rxrpc_krb5_decode_tagged_data(&td[loop],

							    max_elem_size,

							    &xdr, &toklen);

			if (ret < 0)

				return ret;

		}

	}



	*_xdr = xdr;

	*_toklen = toklen;

	_leave(" = 0 [toklen=%u]", toklen);

	return 0;

}



/*

 * extract a krb5 ticket

 */

static int rxrpc_krb5_decode_ticket(u8 **_ticket, uint16_t *_tktlen,

				    const __be32 **_xdr, unsigned *_toklen)

{

	const __be32 *xdr = *_xdr;

	unsigned toklen = *_toklen, len;



	/* there must be at least one length word */

	if (toklen <= 4)

		return -EINVAL;



	_enter(",{%x},%u", ntohl(xdr[0]), toklen);



	len = ntohl(*xdr++);

	toklen -= 4;

	if (len > AFSTOKEN_K5_TIX_MAX)

		return -EINVAL;

	*_tktlen = len;



	_debug("ticket len %u", len);



	if (len > 0) {

		*_ticket = kmalloc(len, GFP_KERNEL);

		if (!*_ticket)

			return -ENOMEM;

		memcpy(*_ticket, xdr, len);

		len = (len + 3) & ~3;

		toklen -= len;

		xdr += len >> 2;

	}



	*_xdr = xdr;

	*_toklen = toklen;

	_leave(" = 0 [toklen=%u]", toklen);

	return 0;

}



/*

 * parse an RxK5 type XDR format token

 * - the caller guarantees we have at least 4 words

 */

static int rxrpc_instantiate_xdr_rxk5(struct key *key, const __be32 *xdr,

				      unsigned toklen)

{

	struct rxrpc_key_token *token, **pptoken;

	struct rxk5_key *rxk5;

	const __be32 *end_xdr = xdr + (toklen >> 2);

	int ret;



	_enter(",{%x,%x,%x,%x},%u",

	       ntohl(xdr[0]), ntohl(xdr[1]), ntohl(xdr[2]), ntohl(xdr[3]),

	       toklen);



	/* reserve some payload space for this subkey - the length of the token

	 * is a reasonable approximation */

	ret = key_payload_reserve(key, key->datalen + toklen);

	if (ret < 0)

		return ret;



	token = kzalloc(sizeof(*token), GFP_KERNEL);

	if (!token)

		return -ENOMEM;



	rxk5 = kzalloc(sizeof(*rxk5), GFP_KERNEL);

	if (!rxk5) {

		kfree(token);

		return -ENOMEM;

	}



	token->security_index = RXRPC_SECURITY_RXK5;

	token->k5 = rxk5;



	/* extract the principals */

	ret = rxrpc_krb5_decode_principal(&rxk5->client, &xdr, &toklen);

	if (ret < 0)

		goto error;

	ret = rxrpc_krb5_decode_principal(&rxk5->server, &xdr, &toklen);

	if (ret < 0)

		goto error;



	/* extract the session key and the encoding type (the tag field ->

	 * ENCTYPE_xxx) */

	ret = rxrpc_krb5_decode_tagged_data(&rxk5->session, AFSTOKEN_DATA_MAX,

					    &xdr, &toklen);

	if (ret < 0)

		goto error;



	if (toklen < 4 * 8 + 2 * 4)

		goto inval;

	rxk5->authtime	= be64_to_cpup((const __be64 *) xdr);

	xdr += 2;

	rxk5->starttime	= be64_to_cpup((const __be64 *) xdr);

	xdr += 2;

	rxk5->endtime	= be64_to_cpup((const __be64 *) xdr);

	xdr += 2;

	rxk5->renew_till = be64_to_cpup((const __be64 *) xdr);

	xdr += 2;

	rxk5->is_skey = ntohl(*xdr++);

	rxk5->flags = ntohl(*xdr++);

	toklen -= 4 * 8 + 2 * 4;



	_debug("times: a=%llx s=%llx e=%llx rt=%llx",

	       rxk5->authtime, rxk5->starttime, rxk5->endtime,

	       rxk5->renew_till);

	_debug("is_skey=%x flags=%x", rxk5->is_skey, rxk5->flags);



	/* extract the permitted client addresses */

	ret = rxrpc_krb5_decode_tagged_array(&rxk5->addresses,

					     &rxk5->n_addresses,

					     AFSTOKEN_K5_ADDRESSES_MAX,

					     AFSTOKEN_DATA_MAX,

					     &xdr, &toklen);

	if (ret < 0)

		goto error;



	ASSERTCMP((end_xdr - xdr) << 2, ==, toklen);



	/* extract the tickets */

	ret = rxrpc_krb5_decode_ticket(&rxk5->ticket, &rxk5->ticket_len,

				       &xdr, &toklen);

	if (ret < 0)

		goto error;

	ret = rxrpc_krb5_decode_ticket(&rxk5->ticket2, &rxk5->ticket2_len,

				       &xdr, &toklen);

	if (ret < 0)

		goto error;



	ASSERTCMP((end_xdr - xdr) << 2, ==, toklen);



	/* extract the typed auth data */

	ret = rxrpc_krb5_decode_tagged_array(&rxk5->authdata,

					     &rxk5->n_authdata,

					     AFSTOKEN_K5_AUTHDATA_MAX,

					     AFSTOKEN_BDATALN_MAX,

					     &xdr, &toklen);

	if (ret < 0)

		goto error;



	ASSERTCMP((end_xdr - xdr) << 2, ==, toklen);



	if (toklen != 0)

		goto inval;



	/* attach the payload to the key */

	for (pptoken = (struct rxrpc_key_token **)&key->payload.data;

	     *pptoken;

	     pptoken = &(*pptoken)->next)

		continue;

	*pptoken = token;

	if (token->kad->expiry < key->expiry)

		key->expiry = token->kad->expiry;



	_leave(" = 0");

	return 0;



inval:

	ret = -EINVAL;

error:

	rxrpc_rxk5_free(rxk5);

	kfree(token);

	_leave(" = %d", ret);

	return ret;

}



/*

 * attempt to parse the data as the XDR format

 * - the caller guarantees we have more than 7 words
@@ -228,6 +613,8 @@ static int rxrpc_instantiate_xdr(struct key *key, const void *data, size_t datal 
		sec_ix = ntohl(*xdr++);

		toklen -= 4;



		_debug("TOKEN type=%u [%p-%p]", sec_ix, xdr, token);



		switch (sec_ix) {

		case RXRPC_SECURITY_RXKAD:

			ret = rxrpc_instantiate_xdr_rxkad(key, xdr, toklen);
@@ -235,6 +622,12 @@ static int rxrpc_instantiate_xdr(struct key *key, const void *data, size_t datal 
				goto error;

			break;



		case RXRPC_SECURITY_RXK5:

			ret = rxrpc_instantiate_xdr_rxk5(key, xdr, toklen);

			if (ret != 0)

				goto error;

			break;



		default:

			ret = -EPROTONOSUPPORT;

			goto error;
@@ -412,6 +805,10 @@ static void rxrpc_destroy(struct key *key) 
		case RXRPC_SECURITY_RXKAD:

			kfree(token->kad);

			break;

		case RXRPC_SECURITY_RXK5:

			if (token->k5)

				rxrpc_rxk5_free(token->k5);

			break;

		default:

			printk(KERN_ERR "Unknown token type %x on rxrpc key\n",

			       token->security_index);
@@ -602,10 +999,13 @@ EXPORT_SYMBOL(rxrpc_get_null_key); 
static long rxrpc_read(const struct key *key,

		       char __user *buffer, size_t buflen)

{

	struct rxrpc_key_token *token;

	size_t size, toksize;

	__be32 __user *xdr;

	u32 cnlen, tktlen, ntoks, zero;

	const struct rxrpc_key_token *token;

	const struct krb5_principal *princ;

	size_t size;

	__be32 __user *xdr, *oldxdr;

	u32 cnlen, toksize, ntoks, tok, zero;

	u16 toksizes[AFSTOKEN_MAX];

	int loop;



	_enter("");
@@ -614,28 +1014,68 @@ static long rxrpc_read(const struct key *key, 
		return -EOPNOTSUPP;

	cnlen = strlen(key->description + 4);



#define RND(X) (((X) + 3) & ~3)



	/* AFS keys we return in XDR form, so we need to work out the size of

	 * the XDR */

	size = 2 * 4;	/* flags, cellname len */

	size += (cnlen + 3) & ~3;	/* cellname */

	size += RND(cnlen);	/* cellname */

	size += 1 * 4;	/* token count */



	ntoks = 0;

	for (token = key->payload.data; token; token = token->next) {

		toksize = 4;	/* sec index */



		switch (token->security_index) {

		case RXRPC_SECURITY_RXKAD:

			size += 2 * 4;	/* length, security index (switch ID) */

			size += 8 * 4;	/* viceid, kvno, key*2, begin, end,

					 * primary, tktlen */

			size += (token->kad->ticket_len + 3) & ~3; /* ticket */

			ntoks++;

			toksize += 8 * 4;	/* viceid, kvno, key*2, begin,

						 * end, primary, tktlen */

			toksize += RND(token->kad->ticket_len);

			break;



		default: /* can't encode */

		case RXRPC_SECURITY_RXK5:

			princ = &token->k5->client;

			toksize += 4 + princ->n_name_parts * 4;

			for (loop = 0; loop < princ->n_name_parts; loop++)

				toksize += RND(strlen(princ->name_parts[loop]));

			toksize += 4 + RND(strlen(princ->realm));



			princ = &token->k5->server;

			toksize += 4 + princ->n_name_parts * 4;

			for (loop = 0; loop < princ->n_name_parts; loop++)

				toksize += RND(strlen(princ->name_parts[loop]));

			toksize += 4 + RND(strlen(princ->realm));



			toksize += 8 + RND(token->k5->session.data_len);



			toksize += 4 * 8 + 2 * 4;



			toksize += 4 + token->k5->n_addresses * 8;

			for (loop = 0; loop < token->k5->n_addresses; loop++)

				toksize += RND(token->k5->addresses[loop].data_len);



			toksize += 4 + RND(token->k5->ticket_len);

			toksize += 4 + RND(token->k5->ticket2_len);



			toksize += 4 + token->k5->n_authdata * 8;

			for (loop = 0; loop < token->k5->n_authdata; loop++)

				toksize += RND(token->k5->authdata[loop].data_len);

			break;



		default: /* we have a ticket we can't encode */

			BUG();

			continue;

		}



		_debug("token[%u]: toksize=%u", ntoks, toksize);

		ASSERTCMP(toksize, <=, AFSTOKEN_LENGTH_MAX);



		toksizes[ntoks++] = toksize;

		size += toksize + 4; /* each token has a length word */

	}



#undef RND



	if (!buffer || buflen < size)

		return size;
@@ -647,52 +1087,109 @@ static long rxrpc_read(const struct key *key, 
		if (put_user(y, xdr++) < 0)	\

			goto fault;		\

	} while(0)

#define ENCODE_DATA(l, s)						\

	do {								\

		u32 _l = (l);						\

		ENCODE(l);						\

		if (copy_to_user(xdr, (s), _l) != 0)			\

			goto fault;					\

		if (_l & 3 &&						\

		    copy_to_user((u8 *)xdr + _l, &zero, 4 - (_l & 3)) != 0) \

			goto fault;					\

		xdr += (_l + 3) >> 2;					\

	} while(0)

#define ENCODE64(x)					\

	do {						\

		__be64 y = cpu_to_be64(x);		\

		if (copy_to_user(xdr, &y, 8) != 0)	\

			goto fault;			\

		xdr += 8 >> 2;				\

	} while(0)

#define ENCODE_STR(s)				\

	do {					\

		const char *_s = (s);		\

		ENCODE_DATA(strlen(_s), _s);	\

	} while(0)



	ENCODE(0);					/* flags */

	ENCODE(cnlen);	/* cellname length */

	if (copy_to_user(xdr, key->description + 4, cnlen) != 0)

		goto fault;

	if (cnlen & 3 &&

	    copy_to_user((u8 *)xdr + cnlen, &zero, 4 - (cnlen & 3)) != 0)

		goto fault;

	xdr += (cnlen + 3) >> 2;

	ENCODE(ntoks);	/* token count */

	ENCODE_DATA(cnlen, key->description + 4);	/* cellname */

	ENCODE(ntoks);



	tok = 0;

	for (token = key->payload.data; token; token = token->next) {

		toksize = 1 * 4;	/* sec index */

		toksize = toksizes[tok++];

		ENCODE(toksize);

		oldxdr = xdr;

		ENCODE(token->security_index);



		switch (token->security_index) {

		case RXRPC_SECURITY_RXKAD:

			toksize += 8 * 4;

			toksize += (token->kad->ticket_len + 3) & ~3;

			ENCODE(toksize);

			ENCODE(token->security_index);

			ENCODE(token->kad->vice_id);

			ENCODE(token->kad->kvno);

			if (copy_to_user(xdr, token->kad->session_key, 8) != 0)

				goto fault;

			xdr += 8 >> 2;

			ENCODE_DATA(8, token->kad->session_key);

			ENCODE(token->kad->start);

			ENCODE(token->kad->expiry);

			ENCODE(token->kad->primary_flag);

			tktlen = token->kad->ticket_len;

			ENCODE(tktlen);

			if (copy_to_user(xdr, token->kad->ticket, tktlen) != 0)

				goto fault;

			if (tktlen & 3 &&

			    copy_to_user((u8 *)xdr + tktlen, &zero,

					 4 - (tktlen & 3)) != 0)

				goto fault;

			xdr += (tktlen + 3) >> 2;

			ENCODE_DATA(token->kad->ticket_len, token->kad->ticket);

			break;



		case RXRPC_SECURITY_RXK5:

			princ = &token->k5->client;

			ENCODE(princ->n_name_parts);

			for (loop = 0; loop < princ->n_name_parts; loop++)

				ENCODE_STR(princ->name_parts[loop]);

			ENCODE_STR(princ->realm);



			princ = &token->k5->server;

			ENCODE(princ->n_name_parts);

			for (loop = 0; loop < princ->n_name_parts; loop++)

				ENCODE_STR(princ->name_parts[loop]);

			ENCODE_STR(princ->realm);



			ENCODE(token->k5->session.tag);

			ENCODE_DATA(token->k5->session.data_len,

				    token->k5->session.data);



			ENCODE64(token->k5->authtime);

			ENCODE64(token->k5->starttime);

			ENCODE64(token->k5->endtime);

			ENCODE64(token->k5->renew_till);

			ENCODE(token->k5->is_skey);

			ENCODE(token->k5->flags);



			ENCODE(token->k5->n_addresses);

			for (loop = 0; loop < token->k5->n_addresses; loop++) {

				ENCODE(token->k5->addresses[loop].tag);

				ENCODE_DATA(token->k5->addresses[loop].data_len,

					    token->k5->addresses[loop].data);

			}



			ENCODE_DATA(token->k5->ticket_len, token->k5->ticket);

			ENCODE_DATA(token->k5->ticket2_len, token->k5->ticket2);



			ENCODE(token->k5->n_authdata);

			for (loop = 0; loop < token->k5->n_authdata; loop++) {

				ENCODE(token->k5->authdata[loop].tag);

				ENCODE_DATA(token->k5->authdata[loop].data_len,

					    token->k5->authdata[loop].data);

			}

			break;



		default:

			BUG();

			break;

		}



		ASSERTCMP((unsigned long)xdr - (unsigned long)oldxdr, ==,

			  toksize);

	}



#undef ENCODE_STR

#undef ENCODE_DATA

#undef ENCODE64

#undef ENCODE



	ASSERTCMP(tok, ==, ntoks);

	ASSERTCMP((char __user *) xdr - buffer, ==, size);

	_leave(" = %zu", size);

	return size;