[net-next-2.6.git] / net / sunrpc / auth_gss / gss_krb5_mech.c

/*
 *  linux/net/sunrpc/gss_krb5_mech.c
 *
 *  Copyright (c) 2001 The Regents of the University of Michigan.
 *  All rights reserved.
 *
 *  Andy Adamson <andros@umich.edu>
 *  J. Bruce Fields <bfields@umich.edu>
 *
 *  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 University 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 ``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 REGENTS 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 <linux/err.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/sunrpc/auth.h>
#include <linux/sunrpc/gss_krb5.h>
#include <linux/sunrpc/xdr.h>
#include <linux/crypto.h>

#ifdef RPC_DEBUG
# define RPCDBG_FACILITY	RPCDBG_AUTH
#endif

static const void *
simple_get_bytes(const void *p, const void *end, void *res, int len)
{
	const void *q = (const void *)((const char *)p + len);
	if (unlikely(q > end || q < p))
		return ERR_PTR(-EFAULT);
	memcpy(res, p, len);
	return q;
}

static const void *
simple_get_netobj(const void *p, const void *end, struct xdr_netobj *res)
{
	const void *q;
	unsigned int len;

	p = simple_get_bytes(p, end, &len, sizeof(len));
	if (IS_ERR(p))
		return p;
	q = (const void *)((const char *)p + len);
	if (unlikely(q > end || q < p))
		return ERR_PTR(-EFAULT);
	res->data = kmemdup(p, len, GFP_KERNEL);
	if (unlikely(res->data == NULL))
		return ERR_PTR(-ENOMEM);
	res->len = len;
	return q;
}

static inline const void *
get_key(const void *p, const void *end, struct crypto_blkcipher **res)
{
	struct xdr_netobj	key;
	int			alg;
	char			*alg_name;

	p = simple_get_bytes(p, end, &alg, sizeof(alg));
	if (IS_ERR(p))
		goto out_err;
	p = simple_get_netobj(p, end, &key);
	if (IS_ERR(p))
		goto out_err;

	switch (alg) {
		case ENCTYPE_DES_CBC_RAW:
			alg_name = "cbc(des)";
			break;
		default:
			printk("gss_kerberos_mech: unsupported algorithm %d\n", alg);
			goto out_err_free_key;
	}
	*res = crypto_alloc_blkcipher(alg_name, 0, CRYPTO_ALG_ASYNC);
	if (IS_ERR(*res)) {
		printk("gss_kerberos_mech: unable to initialize crypto algorithm %s\n", alg_name);
		*res = NULL;
		goto out_err_free_key;
	}
	if (crypto_blkcipher_setkey(*res, key.data, key.len)) {
		printk("gss_kerberos_mech: error setting key for crypto algorithm %s\n", alg_name);
		goto out_err_free_tfm;
	}

	kfree(key.data);
	return p;

out_err_free_tfm:
	crypto_free_blkcipher(*res);
out_err_free_key:
	kfree(key.data);
	p = ERR_PTR(-EINVAL);
out_err:
	return p;
}

static int
gss_import_sec_context_kerberos(const void *p,
				size_t len,
				struct gss_ctx *ctx_id)
{
	const void *end = (const void *)((const char *)p + len);
	struct	krb5_ctx *ctx;
	int tmp;

	if (!(ctx = kzalloc(sizeof(*ctx), GFP_KERNEL)))
		goto out_err;

	p = simple_get_bytes(p, end, &ctx->initiate, sizeof(ctx->initiate));
	if (IS_ERR(p))
		goto out_err_free_ctx;
	/* The downcall format was designed before we completely understood
	 * the uses of the context fields; so it includes some stuff we
	 * just give some minimal sanity-checking, and some we ignore
	 * completely (like the next twenty bytes): */
	if (unlikely(p + 20 > end || p + 20 < p))
		goto out_err_free_ctx;
	p += 20;
	p = simple_get_bytes(p, end, &tmp, sizeof(tmp));
	if (IS_ERR(p))
		goto out_err_free_ctx;
	if (tmp != SGN_ALG_DES_MAC_MD5) {
		p = ERR_PTR(-ENOSYS);
		goto out_err_free_ctx;
	}
	p = simple_get_bytes(p, end, &tmp, sizeof(tmp));
	if (IS_ERR(p))
		goto out_err_free_ctx;
	if (tmp != SEAL_ALG_DES) {
		p = ERR_PTR(-ENOSYS);
		goto out_err_free_ctx;
	}
	p = simple_get_bytes(p, end, &ctx->endtime, sizeof(ctx->endtime));
	if (IS_ERR(p))
		goto out_err_free_ctx;
	p = simple_get_bytes(p, end, &ctx->seq_send, sizeof(ctx->seq_send));
	if (IS_ERR(p))
		goto out_err_free_ctx;
	p = simple_get_netobj(p, end, &ctx->mech_used);
	if (IS_ERR(p))
		goto out_err_free_ctx;
	p = get_key(p, end, &ctx->enc);
	if (IS_ERR(p))
		goto out_err_free_mech;
	p = get_key(p, end, &ctx->seq);
	if (IS_ERR(p))
		goto out_err_free_key1;
	if (p != end) {
		p = ERR_PTR(-EFAULT);
		goto out_err_free_key2;
	}

	ctx_id->internal_ctx_id = ctx;

	dprintk("RPC:       Successfully imported new context.\n");
	return 0;

out_err_free_key2:
	crypto_free_blkcipher(ctx->seq);
out_err_free_key1:
	crypto_free_blkcipher(ctx->enc);
out_err_free_mech:
	kfree(ctx->mech_used.data);
out_err_free_ctx:
	kfree(ctx);
out_err:
	return PTR_ERR(p);
}

static void
gss_delete_sec_context_kerberos(void *internal_ctx) {
	struct krb5_ctx *kctx = internal_ctx;

	crypto_free_blkcipher(kctx->seq);
	crypto_free_blkcipher(kctx->enc);
	kfree(kctx->mech_used.data);
	kfree(kctx);
}

static const struct gss_api_ops gss_kerberos_ops = {
	.gss_import_sec_context	= gss_import_sec_context_kerberos,
	.gss_get_mic		= gss_get_mic_kerberos,
	.gss_verify_mic		= gss_verify_mic_kerberos,
	.gss_wrap		= gss_wrap_kerberos,
	.gss_unwrap		= gss_unwrap_kerberos,
	.gss_delete_sec_context	= gss_delete_sec_context_kerberos,
};

static struct pf_desc gss_kerberos_pfs[] = {
	[0] = {
		.pseudoflavor = RPC_AUTH_GSS_KRB5,
		.service = RPC_GSS_SVC_NONE,
		.name = "krb5",
	},
	[1] = {
		.pseudoflavor = RPC_AUTH_GSS_KRB5I,
		.service = RPC_GSS_SVC_INTEGRITY,
		.name = "krb5i",
	},
	[2] = {
		.pseudoflavor = RPC_AUTH_GSS_KRB5P,
		.service = RPC_GSS_SVC_PRIVACY,
		.name = "krb5p",
	},
};

static struct gss_api_mech gss_kerberos_mech = {
	.gm_name	= "krb5",
	.gm_owner	= THIS_MODULE,
	.gm_oid		= {9, (void *)"\x2a\x86\x48\x86\xf7\x12\x01\x02\x02"},
	.gm_ops		= &gss_kerberos_ops,
	.gm_pf_num	= ARRAY_SIZE(gss_kerberos_pfs),
	.gm_pfs		= gss_kerberos_pfs,
};

static int __init init_kerberos_module(void)
{
	int status;

	status = gss_mech_register(&gss_kerberos_mech);
	if (status)
		printk("Failed to register kerberos gss mechanism!\n");
	return status;
}

static void __exit cleanup_kerberos_module(void)
{
	gss_mech_unregister(&gss_kerberos_mech);
}

MODULE_LICENSE("GPL");
module_init(init_kerberos_module);
module_exit(cleanup_kerberos_module);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/net/sunrpc/gss_krb5_mech.c
	3	*
	4	* Copyright (c) 2001 The Regents of the University of Michigan.
	5	* All rights reserved.
	6	*
	7	* Andy Adamson <andros@umich.edu>
	8	* J. Bruce Fields <bfields@umich.edu>
	9	*
	10	* Redistribution and use in source and binary forms, with or without
	11	* modification, are permitted provided that the following conditions
	12	* are met:
	13	*
	14	* 1. Redistributions of source code must retain the above copyright
	15	* notice, this list of conditions and the following disclaimer.
	16	* 2. Redistributions in binary form must reproduce the above copyright
	17	* notice, this list of conditions and the following disclaimer in the
	18	* documentation and/or other materials provided with the distribution.
	19	* 3. Neither the name of the University nor the names of its
	20	* contributors may be used to endorse or promote products derived
	21	* from this software without specific prior written permission.
	22	*
	23	* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
	24	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
	25	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
	26	* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	27	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	28	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	29	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
	30	* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
	31	* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
	32	* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
	33	* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	34	*
	35	*/
	36
378c6697	37	#include <linux/err.h>
1da177e4 LT	38	#include <linux/module.h>
	39	#include <linux/init.h>
	40	#include <linux/types.h>
	41	#include <linux/slab.h>
	42	#include <linux/sunrpc/auth.h>
1da177e4 LT	43	#include <linux/sunrpc/gss_krb5.h>
	44	#include <linux/sunrpc/xdr.h>
	45	#include <linux/crypto.h>
	46
	47	#ifdef RPC_DEBUG
	48	# define RPCDBG_FACILITY RPCDBG_AUTH
	49	#endif
	50
	51	static const void *
	52	simple_get_bytes(const void p, const void end, void *res, int len)
	53	{
	54	const void q = (const void )((const char *)p + len);
	55	if (unlikely(q > end \|\| q < p))
	56	return ERR_PTR(-EFAULT);
	57	memcpy(res, p, len);
	58	return q;
	59	}
	60
	61	static const void *
	62	simple_get_netobj(const void p, const void end, struct xdr_netobj *res)
	63	{
	64	const void *q;
	65	unsigned int len;
	66
	67	p = simple_get_bytes(p, end, &len, sizeof(len));
	68	if (IS_ERR(p))
	69	return p;
	70	q = (const void )((const char )p + len);
	71	if (unlikely(q > end \|\| q < p))
	72	return ERR_PTR(-EFAULT);
e69062b4	73	res->data = kmemdup(p, len, GFP_KERNEL);
1da177e4 LT	74	if (unlikely(res->data == NULL))
1da177e4 LT	75	return ERR_PTR(-ENOMEM);
1da177e4 LT	76	res->len = len;
	77	return q;
	78	}
	79
	80	static inline const void *
378c6697	81	get_key(const void p, const void end, struct crypto_blkcipher **res)
1da177e4 LT	82	{
1da177e4 LT	83	struct xdr_netobj key;
378c6697	84	int alg;
1da177e4 LT	85	char *alg_name;
	86
	87	p = simple_get_bytes(p, end, &alg, sizeof(alg));
	88	if (IS_ERR(p))
	89	goto out_err;
	90	p = simple_get_netobj(p, end, &key);
	91	if (IS_ERR(p))
	92	goto out_err;
	93
	94	switch (alg) {
	95	case ENCTYPE_DES_CBC_RAW:
378c6697	96	alg_name = "cbc(des)";
1da177e4 LT	97	break;
1da177e4 LT	98	default:
9e56904e	99	printk("gss_kerberos_mech: unsupported algorithm %d\n", alg);
1da177e4 LT	100	goto out_err_free_key;
1da177e4 LT	101	}
378c6697 HX	102	*res = crypto_alloc_blkcipher(alg_name, 0, CRYPTO_ALG_ASYNC);
378c6697 HX	103	if (IS_ERR(*res)) {
9e56904e	104	printk("gss_kerberos_mech: unable to initialize crypto algorithm %s\n", alg_name);
378c6697	105	*res = NULL;
1da177e4	106	goto out_err_free_key;
9e56904e	107	}
378c6697	108	if (crypto_blkcipher_setkey(*res, key.data, key.len)) {
9e56904e	109	printk("gss_kerberos_mech: error setting key for crypto algorithm %s\n", alg_name);
1da177e4	110	goto out_err_free_tfm;
9e56904e	111	}
1da177e4 LT	112
	113	kfree(key.data);
	114	return p;
	115
	116	out_err_free_tfm:
378c6697	117	crypto_free_blkcipher(*res);
1da177e4 LT	118	out_err_free_key:
	119	kfree(key.data);
	120	p = ERR_PTR(-EINVAL);
	121	out_err:
	122	return p;
	123	}
	124
	125	static int
	126	gss_import_sec_context_kerberos(const void *p,
	127	size_t len,
	128	struct gss_ctx *ctx_id)
	129	{
	130	const void end = (const void )((const char *)p + len);
	131	struct krb5_ctx *ctx;
e678e06b	132	int tmp;
1da177e4	133
0da974f4	134	if (!(ctx = kzalloc(sizeof(*ctx), GFP_KERNEL)))
1da177e4	135	goto out_err;
1da177e4 LT	136
	137	p = simple_get_bytes(p, end, &ctx->initiate, sizeof(ctx->initiate));
	138	if (IS_ERR(p))
	139	goto out_err_free_ctx;
717757ad BF	140	/* The downcall format was designed before we completely understood
	141	* the uses of the context fields; so it includes some stuff we
	142	* just give some minimal sanity-checking, and some we ignore
	143	* completely (like the next twenty bytes): */
	144	if (unlikely(p + 20 > end \|\| p + 20 < p))
1da177e4	145	goto out_err_free_ctx;
717757ad	146	p += 20;
e678e06b	147	p = simple_get_bytes(p, end, &tmp, sizeof(tmp));
1da177e4 LT	148	if (IS_ERR(p))
1da177e4 LT	149	goto out_err_free_ctx;
ef338bee KC	150	if (tmp != SGN_ALG_DES_MAC_MD5) {
ef338bee KC	151	p = ERR_PTR(-ENOSYS);
e678e06b	152	goto out_err_free_ctx;
ef338bee	153	}
d922a84a	154	p = simple_get_bytes(p, end, &tmp, sizeof(tmp));
1da177e4 LT	155	if (IS_ERR(p))
1da177e4 LT	156	goto out_err_free_ctx;
ef338bee KC	157	if (tmp != SEAL_ALG_DES) {
ef338bee KC	158	p = ERR_PTR(-ENOSYS);
d922a84a	159	goto out_err_free_ctx;
ef338bee	160	}
1da177e4 LT	161	p = simple_get_bytes(p, end, &ctx->endtime, sizeof(ctx->endtime));
	162	if (IS_ERR(p))
	163	goto out_err_free_ctx;
	164	p = simple_get_bytes(p, end, &ctx->seq_send, sizeof(ctx->seq_send));
	165	if (IS_ERR(p))
	166	goto out_err_free_ctx;
	167	p = simple_get_netobj(p, end, &ctx->mech_used);
	168	if (IS_ERR(p))
	169	goto out_err_free_ctx;
	170	p = get_key(p, end, &ctx->enc);
	171	if (IS_ERR(p))
	172	goto out_err_free_mech;
	173	p = get_key(p, end, &ctx->seq);
	174	if (IS_ERR(p))
	175	goto out_err_free_key1;
	176	if (p != end) {
	177	p = ERR_PTR(-EFAULT);
	178	goto out_err_free_key2;
	179	}
	180
	181	ctx_id->internal_ctx_id = ctx;
8885cb36 CL	182
8885cb36 CL	183	dprintk("RPC: Successfully imported new context.\n");
1da177e4 LT	184	return 0;
	185
	186	out_err_free_key2:
378c6697	187	crypto_free_blkcipher(ctx->seq);
1da177e4	188	out_err_free_key1:
378c6697	189	crypto_free_blkcipher(ctx->enc);
1da177e4 LT	190	out_err_free_mech:
	191	kfree(ctx->mech_used.data);
	192	out_err_free_ctx:
	193	kfree(ctx);
	194	out_err:
	195	return PTR_ERR(p);
	196	}
	197
	198	static void
	199	gss_delete_sec_context_kerberos(void *internal_ctx) {
	200	struct krb5_ctx *kctx = internal_ctx;
	201
378c6697 HX	202	crypto_free_blkcipher(kctx->seq);
378c6697 HX	203	crypto_free_blkcipher(kctx->enc);
573dbd95	204	kfree(kctx->mech_used.data);
1da177e4 LT	205	kfree(kctx);
	206	}
	207
f1c0a861	208	static const struct gss_api_ops gss_kerberos_ops = {
1da177e4 LT	209	.gss_import_sec_context = gss_import_sec_context_kerberos,
	210	.gss_get_mic = gss_get_mic_kerberos,
	211	.gss_verify_mic = gss_verify_mic_kerberos,
14ae162c BF	212	.gss_wrap = gss_wrap_kerberos,
14ae162c BF	213	.gss_unwrap = gss_unwrap_kerberos,
1da177e4 LT	214	.gss_delete_sec_context = gss_delete_sec_context_kerberos,
	215	};
	216
	217	static struct pf_desc gss_kerberos_pfs[] = {
	218	[0] = {
	219	.pseudoflavor = RPC_AUTH_GSS_KRB5,
	220	.service = RPC_GSS_SVC_NONE,
	221	.name = "krb5",
	222	},
	223	[1] = {
	224	.pseudoflavor = RPC_AUTH_GSS_KRB5I,
	225	.service = RPC_GSS_SVC_INTEGRITY,
	226	.name = "krb5i",
	227	},
14ae162c BF	228	[2] = {
	229	.pseudoflavor = RPC_AUTH_GSS_KRB5P,
	230	.service = RPC_GSS_SVC_PRIVACY,
	231	.name = "krb5p",
	232	},
1da177e4 LT	233	};
	234
	235	static struct gss_api_mech gss_kerberos_mech = {
	236	.gm_name = "krb5",
	237	.gm_owner = THIS_MODULE,
ae4c40b1	238	.gm_oid = {9, (void *)"\x2a\x86\x48\x86\xf7\x12\x01\x02\x02"},
1da177e4 LT	239	.gm_ops = &gss_kerberos_ops,
	240	.gm_pf_num = ARRAY_SIZE(gss_kerberos_pfs),
	241	.gm_pfs = gss_kerberos_pfs,
	242	};
	243
	244	static int __init init_kerberos_module(void)
	245	{
	246	int status;
	247
	248	status = gss_mech_register(&gss_kerberos_mech);
	249	if (status)
	250	printk("Failed to register kerberos gss mechanism!\n");
	251	return status;
	252	}
	253
	254	static void __exit cleanup_kerberos_module(void)
	255	{
	256	gss_mech_unregister(&gss_kerberos_mech);
	257	}
	258
	259	MODULE_LICENSE("GPL");
	260	module_init(init_kerberos_module);
	261	module_exit(cleanup_kerberos_module);