[mirror_ubuntu-artful-kernel.git] / fs / cifs / cifs_spnego.c

/*
 *   fs/cifs/cifs_spnego.c -- SPNEGO upcall management for CIFS
 *
 *   Copyright (c) 2007 Red Hat, Inc.
 *   Author(s): Jeff Layton (jlayton@redhat.com)
 *
 *   This library is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU Lesser General Public License as published
 *   by the Free Software Foundation; either version 2.1 of the License, or
 *   (at your option) any later version.
 *
 *   This library is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 *   the GNU Lesser General Public License for more details.
 *
 *   You should have received a copy of the GNU Lesser General Public License
 *   along with this library; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#include <linux/list.h>
#include <linux/string.h>
#include <keys/user-type.h>
#include <linux/key-type.h>
#include <linux/inet.h>
#include "cifsglob.h"
#include "cifs_spnego.h"
#include "cifs_debug.h"

/* create a new cifs key */
static int
cifs_spnego_key_instantiate(struct key *key, const void *data, size_t datalen)
{
	char *payload;
	int ret;

	ret = -ENOMEM;
	payload = kmalloc(datalen, GFP_KERNEL);
	if (!payload)
		goto error;

	/* attach the data */
	memcpy(payload, data, datalen);
	key->payload.data = payload;
	ret = 0;

error:
	return ret;
}

static void
cifs_spnego_key_destroy(struct key *key)
{
	kfree(key->payload.data);
}


/*
 * keytype for CIFS spnego keys
 */
struct key_type cifs_spnego_key_type = {
	.name		= "cifs.spnego",
	.instantiate	= cifs_spnego_key_instantiate,
	.match		= user_match,
	.destroy	= cifs_spnego_key_destroy,
	.describe	= user_describe,
};

/* length of longest version string e.g.  strlen("ver=0xFF") */
#define MAX_VER_STR_LEN		8

/* length of longest security mechanism name, eg in future could have
 * strlen(";sec=ntlmsspi") */
#define MAX_MECH_STR_LEN	13

/* strlen of "host=" */
#define HOST_KEY_LEN		5

/* strlen of ";ip4=" or ";ip6=" */
#define IP_KEY_LEN		5

/* strlen of ";uid=0x" */
#define UID_KEY_LEN		7

/* strlen of ";user=" */
#define USER_KEY_LEN		6

/* strlen of ";pid=0x" */
#define PID_KEY_LEN		7

/* get a key struct with a SPNEGO security blob, suitable for session setup */
struct key *
cifs_get_spnego_key(struct cifsSesInfo *sesInfo)
{
	struct TCP_Server_Info *server = sesInfo->server;
	char *description, *dp;
	size_t desc_len;
	struct key *spnego_key;
	const char *hostname = server->hostname;

	/* length of fields (with semicolons): ver=0xyz ip4=ipaddress
	   host=hostname sec=mechanism uid=0xFF user=username */
	desc_len = MAX_VER_STR_LEN +
		   HOST_KEY_LEN + strlen(hostname) +
		   IP_KEY_LEN + INET6_ADDRSTRLEN +
		   MAX_MECH_STR_LEN +
		   UID_KEY_LEN + (sizeof(uid_t) * 2) +
		   USER_KEY_LEN + strlen(sesInfo->userName) +
		   PID_KEY_LEN + (sizeof(pid_t) * 2) + 1;

	spnego_key = ERR_PTR(-ENOMEM);
	description = kzalloc(desc_len, GFP_KERNEL);
	if (description == NULL)
		goto out;

	dp = description;
	/* start with version and hostname portion of UNC string */
	spnego_key = ERR_PTR(-EINVAL);
	sprintf(dp, "ver=0x%x;host=%s;", CIFS_SPNEGO_UPCALL_VERSION,
		hostname);
	dp = description + strlen(description);

	/* add the server address */
	if (server->addr.sockAddr.sin_family == AF_INET)
		sprintf(dp, "ip4=%pI4", &server->addr.sockAddr.sin_addr);
	else if (server->addr.sockAddr.sin_family == AF_INET6)
		sprintf(dp, "ip6=%pi6", &server->addr.sockAddr6.sin6_addr);
	else
		goto out;

	dp = description + strlen(description);

	/* for now, only sec=krb5 and sec=mskrb5 are valid */
	if (server->secType == Kerberos)
		sprintf(dp, ";sec=krb5");
	else if (server->secType == MSKerberos)
		sprintf(dp, ";sec=mskrb5");
	else
		goto out;

	dp = description + strlen(description);
	sprintf(dp, ";uid=0x%x", sesInfo->linux_uid);

	dp = description + strlen(description);
	sprintf(dp, ";user=%s", sesInfo->userName);

	dp = description + strlen(description);
	sprintf(dp, ";pid=0x%x", current->pid);

	cFYI(1, ("key description = %s", description));
	spnego_key = request_key(&cifs_spnego_key_type, description, "");

#ifdef CONFIG_CIFS_DEBUG2
	if (cifsFYI && !IS_ERR(spnego_key)) {
		struct cifs_spnego_msg *msg = spnego_key->payload.data;
		cifs_dump_mem("SPNEGO reply blob:", msg->data, min(1024U,
				msg->secblob_len + msg->sesskey_len));
	}
#endif /* CONFIG_CIFS_DEBUG2 */

out:
	kfree(description);
	return spnego_key;
}
Commit	Line	Data
f1d662a7 SF	1	/*
	2	* fs/cifs/cifs_spnego.c -- SPNEGO upcall management for CIFS
	3	*
	4	* Copyright (c) 2007 Red Hat, Inc.
	5	* Author(s): Jeff Layton (jlayton@redhat.com)
	6	*
	7	* This library is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU Lesser General Public License as published
	9	* by the Free Software Foundation; either version 2.1 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This library is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
	15	* the GNU Lesser General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU Lesser General Public License
	18	* along with this library; if not, write to the Free Software
	19	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	20	*/
	21
	22	#include <linux/list.h>
	23	#include <linux/string.h>
	24	#include <keys/user-type.h>
	25	#include <linux/key-type.h>
50b64e3b	26	#include <linux/inet.h>
f1d662a7 SF	27	#include "cifsglob.h"
	28	#include "cifs_spnego.h"
	29	#include "cifs_debug.h"
	30
	31	/* create a new cifs key */
	32	static int
	33	cifs_spnego_key_instantiate(struct key key, const void data, size_t datalen)
	34	{
	35	char *payload;
	36	int ret;
	37
	38	ret = -ENOMEM;
	39	payload = kmalloc(datalen, GFP_KERNEL);
	40	if (!payload)
	41	goto error;
	42
	43	/* attach the data */
	44	memcpy(payload, data, datalen);
d9fb5c09	45	key->payload.data = payload;
f1d662a7 SF	46	ret = 0;
	47
	48	error:
	49	return ret;
	50	}
	51
	52	static void
	53	cifs_spnego_key_destroy(struct key *key)
	54	{
	55	kfree(key->payload.data);
	56	}
	57
	58
	59	/*
	60	* keytype for CIFS spnego keys
	61	*/
	62	struct key_type cifs_spnego_key_type = {
	63	.name = "cifs.spnego",
	64	.instantiate = cifs_spnego_key_instantiate,
	65	.match = user_match,
	66	.destroy = cifs_spnego_key_destroy,
	67	.describe = user_describe,
	68	};
	69
7c9c3760 SF	70	/* length of longest version string e.g. strlen("ver=0xFF") */
	71	#define MAX_VER_STR_LEN 8
	72
	73	/* length of longest security mechanism name, eg in future could have
	74	* strlen(";sec=ntlmsspi") */
	75	#define MAX_MECH_STR_LEN 13
	76
7c9c3760 SF	77	/* strlen of "host=" */
	78	#define HOST_KEY_LEN 5
	79
	80	/* strlen of ";ip4=" or ";ip6=" */
	81	#define IP_KEY_LEN 5
	82
	83	/* strlen of ";uid=0x" */
	84	#define UID_KEY_LEN 7
	85
	86	/* strlen of ";user=" */
	87	#define USER_KEY_LEN 6
	88
c4c1bff6 JL	89	/* strlen of ";pid=0x" */
	90	#define PID_KEY_LEN 7
	91
f1d662a7 SF	92	/* get a key struct with a SPNEGO security blob, suitable for session setup */
f1d662a7 SF	93	struct key *
d6c2e4d0	94	cifs_get_spnego_key(struct cifsSesInfo *sesInfo)
f1d662a7 SF	95	{
	96	struct TCP_Server_Info *server = sesInfo->server;
	97	char description, dp;
	98	size_t desc_len;
	99	struct key *spnego_key;
d6c2e4d0	100	const char *hostname = server->hostname;
f1d662a7	101
66b8bd3c JL	102	/* length of fields (with semicolons): ver=0xyz ip4=ipaddress
	103	host=hostname sec=mechanism uid=0xFF user=username */
	104	desc_len = MAX_VER_STR_LEN +
7c9c3760	105	HOST_KEY_LEN + strlen(hostname) +
50b64e3b	106	IP_KEY_LEN + INET6_ADDRSTRLEN +
66b8bd3c	107	MAX_MECH_STR_LEN +
7c9c3760	108	UID_KEY_LEN + (sizeof(uid_t) * 2) +
c4c1bff6 JL	109	USER_KEY_LEN + strlen(sesInfo->userName) +
c4c1bff6 JL	110	PID_KEY_LEN + (sizeof(pid_t) * 2) + 1;
66b8bd3c	111
f1d662a7 SF	112	spnego_key = ERR_PTR(-ENOMEM);
	113	description = kzalloc(desc_len, GFP_KERNEL);
	114	if (description == NULL)
	115	goto out;
	116
	117	dp = description;
	118	/* start with version and hostname portion of UNC string */
	119	spnego_key = ERR_PTR(-EINVAL);
68bf728a	120	sprintf(dp, "ver=0x%x;host=%s;", CIFS_SPNEGO_UPCALL_VERSION,
f1d662a7 SF	121	hostname);
	122	dp = description + strlen(description);
	123
	124	/* add the server address */
	125	if (server->addr.sockAddr.sin_family == AF_INET)
be859405	126	sprintf(dp, "ip4=%pI4", &server->addr.sockAddr.sin_addr);
f1d662a7	127	else if (server->addr.sockAddr.sin_family == AF_INET6)
4b7a4274	128	sprintf(dp, "ip6=%pi6", &server->addr.sockAddr6.sin6_addr);
f1d662a7 SF	129	else
	130	goto out;
	131
	132	dp = description + strlen(description);
	133
c16fefa5	134	/* for now, only sec=krb5 and sec=mskrb5 are valid */
f1d662a7 SF	135	if (server->secType == Kerberos)
f1d662a7 SF	136	sprintf(dp, ";sec=krb5");
c16fefa5 SF	137	else if (server->secType == MSKerberos)
c16fefa5 SF	138	sprintf(dp, ";sec=mskrb5");
f1d662a7 SF	139	else
	140	goto out;
	141
9eae8a89 IM	142	dp = description + strlen(description);
	143	sprintf(dp, ";uid=0x%x", sesInfo->linux_uid);
	144
e4058245 IM	145	dp = description + strlen(description);
	146	sprintf(dp, ";user=%s", sesInfo->userName);
	147
c4c1bff6 JL	148	dp = description + strlen(description);
	149	sprintf(dp, ";pid=0x%x", current->pid);
	150
f1d662a7 SF	151	cFYI(1, ("key description = %s", description));
	152	spnego_key = request_key(&cifs_spnego_key_type, description, "");
	153
05b3de63	154	#ifdef CONFIG_CIFS_DEBUG2
f1d662a7 SF	155	if (cifsFYI && !IS_ERR(spnego_key)) {
f1d662a7 SF	156	struct cifs_spnego_msg *msg = spnego_key->payload.data;
ead03e30	157	cifs_dump_mem("SPNEGO reply blob:", msg->data, min(1024U,
05b3de63	158	msg->secblob_len + msg->sesskey_len));
f1d662a7	159	}
05b3de63	160	#endif /* CONFIG_CIFS_DEBUG2 */
f1d662a7 SF	161
	162	out:
	163	kfree(description);
	164	return spnego_key;
	165	}