[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 = kmalloc(len, GFP_KERNEL);
	if (unlikely(res->data == NULL))
		return ERR_PTR(-ENOMEM);
	memcpy(res->data, p, len);
	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;

	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;
	p = simple_get_bytes(p, end, &ctx->seed_init, sizeof(ctx->seed_init));
	if (IS_ERR(p))
		goto out_err_free_ctx;
	p = simple_get_bytes(p, end, ctx->seed, sizeof(ctx->seed));
	if (IS_ERR(p))
		goto out_err_free_ctx;
	p = simple_get_bytes(p, end, &ctx->signalg, sizeof(ctx->signalg));
	if (IS_ERR(p))
		goto out_err_free_ctx;
	p = simple_get_bytes(p, end, &ctx->sealalg, sizeof(ctx->sealalg));
	if (IS_ERR(p))
		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 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_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);
	73	res->data = kmalloc(len, GFP_KERNEL);
	74	if (unlikely(res->data == NULL))
	75	return ERR_PTR(-ENOMEM);
	76	memcpy(res->data, p, len);
	77	res->len = len;
	78	return q;
	79	}
	80
	81	static inline const void *
378c6697	82	get_key(const void p, const void end, struct crypto_blkcipher **res)
1da177e4 LT	83	{
1da177e4 LT	84	struct xdr_netobj key;
378c6697	85	int alg;
1da177e4 LT	86	char *alg_name;
	87
	88	p = simple_get_bytes(p, end, &alg, sizeof(alg));
	89	if (IS_ERR(p))
	90	goto out_err;
	91	p = simple_get_netobj(p, end, &key);
	92	if (IS_ERR(p))
	93	goto out_err;
	94
	95	switch (alg) {
	96	case ENCTYPE_DES_CBC_RAW:
378c6697	97	alg_name = "cbc(des)";
1da177e4 LT	98	break;
1da177e4 LT	99	default:
9e56904e	100	printk("gss_kerberos_mech: unsupported algorithm %d\n", alg);
1da177e4 LT	101	goto out_err_free_key;
1da177e4 LT	102	}
378c6697 HX	103	*res = crypto_alloc_blkcipher(alg_name, 0, CRYPTO_ALG_ASYNC);
378c6697 HX	104	if (IS_ERR(*res)) {
9e56904e	105	printk("gss_kerberos_mech: unable to initialize crypto algorithm %s\n", alg_name);
378c6697	106	*res = NULL;
1da177e4	107	goto out_err_free_key;
9e56904e	108	}
378c6697	109	if (crypto_blkcipher_setkey(*res, key.data, key.len)) {
9e56904e	110	printk("gss_kerberos_mech: error setting key for crypto algorithm %s\n", alg_name);
1da177e4	111	goto out_err_free_tfm;
9e56904e	112	}
1da177e4 LT	113
	114	kfree(key.data);
	115	return p;
	116
	117	out_err_free_tfm:
378c6697	118	crypto_free_blkcipher(*res);
1da177e4 LT	119	out_err_free_key:
	120	kfree(key.data);
	121	p = ERR_PTR(-EINVAL);
	122	out_err:
	123	return p;
	124	}
	125
	126	static int
	127	gss_import_sec_context_kerberos(const void *p,
	128	size_t len,
	129	struct gss_ctx *ctx_id)
	130	{
	131	const void end = (const void )((const char *)p + len);
	132	struct krb5_ctx *ctx;
	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;
	140	p = simple_get_bytes(p, end, &ctx->seed_init, sizeof(ctx->seed_init));
	141	if (IS_ERR(p))
	142	goto out_err_free_ctx;
	143	p = simple_get_bytes(p, end, ctx->seed, sizeof(ctx->seed));
	144	if (IS_ERR(p))
	145	goto out_err_free_ctx;
	146	p = simple_get_bytes(p, end, &ctx->signalg, sizeof(ctx->signalg));
	147	if (IS_ERR(p))
	148	goto out_err_free_ctx;
	149	p = simple_get_bytes(p, end, &ctx->sealalg, sizeof(ctx->sealalg));
	150	if (IS_ERR(p))
	151	goto out_err_free_ctx;
	152	p = simple_get_bytes(p, end, &ctx->endtime, sizeof(ctx->endtime));
	153	if (IS_ERR(p))
	154	goto out_err_free_ctx;
	155	p = simple_get_bytes(p, end, &ctx->seq_send, sizeof(ctx->seq_send));
	156	if (IS_ERR(p))
	157	goto out_err_free_ctx;
	158	p = simple_get_netobj(p, end, &ctx->mech_used);
	159	if (IS_ERR(p))
	160	goto out_err_free_ctx;
	161	p = get_key(p, end, &ctx->enc);
	162	if (IS_ERR(p))
	163	goto out_err_free_mech;
	164	p = get_key(p, end, &ctx->seq);
	165	if (IS_ERR(p))
	166	goto out_err_free_key1;
	167	if (p != end) {
	168	p = ERR_PTR(-EFAULT);
	169	goto out_err_free_key2;
	170	}
	171
	172	ctx_id->internal_ctx_id = ctx;
d6e05edc	173	dprintk("RPC: Successfully imported new context.\n");
1da177e4 LT	174	return 0;
	175
	176	out_err_free_key2:
378c6697	177	crypto_free_blkcipher(ctx->seq);
1da177e4	178	out_err_free_key1:
378c6697	179	crypto_free_blkcipher(ctx->enc);
1da177e4 LT	180	out_err_free_mech:
	181	kfree(ctx->mech_used.data);
	182	out_err_free_ctx:
	183	kfree(ctx);
	184	out_err:
	185	return PTR_ERR(p);
	186	}
	187
	188	static void
	189	gss_delete_sec_context_kerberos(void *internal_ctx) {
	190	struct krb5_ctx *kctx = internal_ctx;
	191
378c6697 HX	192	crypto_free_blkcipher(kctx->seq);
378c6697 HX	193	crypto_free_blkcipher(kctx->enc);
573dbd95	194	kfree(kctx->mech_used.data);
1da177e4 LT	195	kfree(kctx);
	196	}
	197
1da177e4 LT	198	static struct gss_api_ops gss_kerberos_ops = {
	199	.gss_import_sec_context = gss_import_sec_context_kerberos,
	200	.gss_get_mic = gss_get_mic_kerberos,
	201	.gss_verify_mic = gss_verify_mic_kerberos,
14ae162c BF	202	.gss_wrap = gss_wrap_kerberos,
14ae162c BF	203	.gss_unwrap = gss_unwrap_kerberos,
1da177e4 LT	204	.gss_delete_sec_context = gss_delete_sec_context_kerberos,
	205	};
	206
	207	static struct pf_desc gss_kerberos_pfs[] = {
	208	[0] = {
	209	.pseudoflavor = RPC_AUTH_GSS_KRB5,
	210	.service = RPC_GSS_SVC_NONE,
	211	.name = "krb5",
	212	},
	213	[1] = {
	214	.pseudoflavor = RPC_AUTH_GSS_KRB5I,
	215	.service = RPC_GSS_SVC_INTEGRITY,
	216	.name = "krb5i",
	217	},
14ae162c BF	218	[2] = {
	219	.pseudoflavor = RPC_AUTH_GSS_KRB5P,
	220	.service = RPC_GSS_SVC_PRIVACY,
	221	.name = "krb5p",
	222	},
1da177e4 LT	223	};
	224
	225	static struct gss_api_mech gss_kerberos_mech = {
	226	.gm_name = "krb5",
	227	.gm_owner = THIS_MODULE,
	228	.gm_ops = &gss_kerberos_ops,
	229	.gm_pf_num = ARRAY_SIZE(gss_kerberos_pfs),
	230	.gm_pfs = gss_kerberos_pfs,
	231	};
	232
	233	static int __init init_kerberos_module(void)
	234	{
	235	int status;
	236
	237	status = gss_mech_register(&gss_kerberos_mech);
	238	if (status)
	239	printk("Failed to register kerberos gss mechanism!\n");
	240	return status;
	241	}
	242
	243	static void __exit cleanup_kerberos_module(void)
	244	{
	245	gss_mech_unregister(&gss_kerberos_mech);
	246	}
	247
	248	MODULE_LICENSE("GPL");
	249	module_init(init_kerberos_module);
	250	module_exit(cleanup_kerberos_module);