[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/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_tfm **res)
{
	struct xdr_netobj	key;
	int			alg, alg_mode;
	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 = "des";
			alg_mode = CRYPTO_TFM_MODE_CBC;
			break;
		default:
			printk("gss_kerberos_mech: unsupported algorithm %d\n", alg);
			goto out_err_free_key;
	}
	if (!(*res = crypto_alloc_tfm(alg_name, alg_mode))) {
		printk("gss_kerberos_mech: unable to initialize crypto algorithm %s\n", alg_name);
		goto out_err_free_key;
	}
	if (crypto_cipher_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_tfm(*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_tfm(ctx->seq);
out_err_free_key1:
	crypto_free_tfm(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_tfm(kctx->seq);
	crypto_free_tfm(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
	37	#include <linux/module.h>
	38	#include <linux/init.h>
	39	#include <linux/types.h>
	40	#include <linux/slab.h>
	41	#include <linux/sunrpc/auth.h>
1da177e4 LT	42	#include <linux/sunrpc/gss_krb5.h>
	43	#include <linux/sunrpc/xdr.h>
	44	#include <linux/crypto.h>
	45
	46	#ifdef RPC_DEBUG
	47	# define RPCDBG_FACILITY RPCDBG_AUTH
	48	#endif
	49
	50	static const void *
	51	simple_get_bytes(const void p, const void end, void *res, int len)
	52	{
	53	const void q = (const void )((const char *)p + len);
	54	if (unlikely(q > end \|\| q < p))
	55	return ERR_PTR(-EFAULT);
	56	memcpy(res, p, len);
	57	return q;
	58	}
	59
	60	static const void *
	61	simple_get_netobj(const void p, const void end, struct xdr_netobj *res)
	62	{
	63	const void *q;
	64	unsigned int len;
	65
	66	p = simple_get_bytes(p, end, &len, sizeof(len));
	67	if (IS_ERR(p))
	68	return p;
	69	q = (const void )((const char )p + len);
	70	if (unlikely(q > end \|\| q < p))
	71	return ERR_PTR(-EFAULT);
	72	res->data = kmalloc(len, GFP_KERNEL);
	73	if (unlikely(res->data == NULL))
	74	return ERR_PTR(-ENOMEM);
	75	memcpy(res->data, p, len);
	76	res->len = len;
	77	return q;
	78	}
	79
	80	static inline const void *
	81	get_key(const void p, const void end, struct crypto_tfm **res)
	82	{
	83	struct xdr_netobj key;
	84	int alg, alg_mode;
	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:
	96	alg_name = "des";
	97	alg_mode = CRYPTO_TFM_MODE_CBC;
	98	break;
	99	default:
9e56904e	100	printk("gss_kerberos_mech: unsupported algorithm %d\n", alg);
1da177e4 LT	101	goto out_err_free_key;
1da177e4 LT	102	}
9e56904e BF	103	if (!(*res = crypto_alloc_tfm(alg_name, alg_mode))) {
9e56904e BF	104	printk("gss_kerberos_mech: unable to initialize crypto algorithm %s\n", alg_name);
1da177e4	105	goto out_err_free_key;
9e56904e BF	106	}
	107	if (crypto_cipher_setkey(*res, key.data, key.len)) {
	108	printk("gss_kerberos_mech: error setting key for crypto algorithm %s\n", alg_name);
1da177e4	109	goto out_err_free_tfm;
9e56904e	110	}
1da177e4 LT	111
	112	kfree(key.data);
	113	return p;
	114
	115	out_err_free_tfm:
	116	crypto_free_tfm(*res);
	117	out_err_free_key:
	118	kfree(key.data);
	119	p = ERR_PTR(-EINVAL);
	120	out_err:
	121	return p;
	122	}
	123
	124	static int
	125	gss_import_sec_context_kerberos(const void *p,
	126	size_t len,
	127	struct gss_ctx *ctx_id)
	128	{
	129	const void end = (const void )((const char *)p + len);
	130	struct krb5_ctx *ctx;
	131
0da974f4	132	if (!(ctx = kzalloc(sizeof(*ctx), GFP_KERNEL)))
1da177e4	133	goto out_err;
1da177e4 LT	134
	135	p = simple_get_bytes(p, end, &ctx->initiate, sizeof(ctx->initiate));
	136	if (IS_ERR(p))
	137	goto out_err_free_ctx;
	138	p = simple_get_bytes(p, end, &ctx->seed_init, sizeof(ctx->seed_init));
	139	if (IS_ERR(p))
	140	goto out_err_free_ctx;
	141	p = simple_get_bytes(p, end, ctx->seed, sizeof(ctx->seed));
	142	if (IS_ERR(p))
	143	goto out_err_free_ctx;
	144	p = simple_get_bytes(p, end, &ctx->signalg, sizeof(ctx->signalg));
	145	if (IS_ERR(p))
	146	goto out_err_free_ctx;
	147	p = simple_get_bytes(p, end, &ctx->sealalg, sizeof(ctx->sealalg));
	148	if (IS_ERR(p))
	149	goto out_err_free_ctx;
	150	p = simple_get_bytes(p, end, &ctx->endtime, sizeof(ctx->endtime));
	151	if (IS_ERR(p))
	152	goto out_err_free_ctx;
	153	p = simple_get_bytes(p, end, &ctx->seq_send, sizeof(ctx->seq_send));
	154	if (IS_ERR(p))
	155	goto out_err_free_ctx;
	156	p = simple_get_netobj(p, end, &ctx->mech_used);
	157	if (IS_ERR(p))
	158	goto out_err_free_ctx;
	159	p = get_key(p, end, &ctx->enc);
	160	if (IS_ERR(p))
	161	goto out_err_free_mech;
	162	p = get_key(p, end, &ctx->seq);
	163	if (IS_ERR(p))
	164	goto out_err_free_key1;
	165	if (p != end) {
	166	p = ERR_PTR(-EFAULT);
	167	goto out_err_free_key2;
	168	}
	169
	170	ctx_id->internal_ctx_id = ctx;
d6e05edc	171	dprintk("RPC: Successfully imported new context.\n");
1da177e4 LT	172	return 0;
	173
	174	out_err_free_key2:
	175	crypto_free_tfm(ctx->seq);
	176	out_err_free_key1:
	177	crypto_free_tfm(ctx->enc);
	178	out_err_free_mech:
	179	kfree(ctx->mech_used.data);
	180	out_err_free_ctx:
	181	kfree(ctx);
	182	out_err:
	183	return PTR_ERR(p);
	184	}
	185
	186	static void
	187	gss_delete_sec_context_kerberos(void *internal_ctx) {
	188	struct krb5_ctx *kctx = internal_ctx;
	189
573dbd95 JJ	190	crypto_free_tfm(kctx->seq);
	191	crypto_free_tfm(kctx->enc);
	192	kfree(kctx->mech_used.data);
1da177e4 LT	193	kfree(kctx);
	194	}
	195
1da177e4 LT	196	static struct gss_api_ops gss_kerberos_ops = {
	197	.gss_import_sec_context = gss_import_sec_context_kerberos,
	198	.gss_get_mic = gss_get_mic_kerberos,
	199	.gss_verify_mic = gss_verify_mic_kerberos,
14ae162c BF	200	.gss_wrap = gss_wrap_kerberos,
14ae162c BF	201	.gss_unwrap = gss_unwrap_kerberos,
1da177e4 LT	202	.gss_delete_sec_context = gss_delete_sec_context_kerberos,
	203	};
	204
	205	static struct pf_desc gss_kerberos_pfs[] = {
	206	[0] = {
	207	.pseudoflavor = RPC_AUTH_GSS_KRB5,
	208	.service = RPC_GSS_SVC_NONE,
	209	.name = "krb5",
	210	},
	211	[1] = {
	212	.pseudoflavor = RPC_AUTH_GSS_KRB5I,
	213	.service = RPC_GSS_SVC_INTEGRITY,
	214	.name = "krb5i",
	215	},
14ae162c BF	216	[2] = {
	217	.pseudoflavor = RPC_AUTH_GSS_KRB5P,
	218	.service = RPC_GSS_SVC_PRIVACY,
	219	.name = "krb5p",
	220	},
1da177e4 LT	221	};
	222
	223	static struct gss_api_mech gss_kerberos_mech = {
	224	.gm_name = "krb5",
	225	.gm_owner = THIS_MODULE,
	226	.gm_ops = &gss_kerberos_ops,
	227	.gm_pf_num = ARRAY_SIZE(gss_kerberos_pfs),
	228	.gm_pfs = gss_kerberos_pfs,
	229	};
	230
	231	static int __init init_kerberos_module(void)
	232	{
	233	int status;
	234
	235	status = gss_mech_register(&gss_kerberos_mech);
	236	if (status)
	237	printk("Failed to register kerberos gss mechanism!\n");
	238	return status;
	239	}
	240
	241	static void __exit cleanup_kerberos_module(void)
	242	{
	243	gss_mech_unregister(&gss_kerberos_mech);
	244	}
	245
	246	MODULE_LICENSE("GPL");
	247	module_init(init_kerberos_module);
	248	module_exit(cleanup_kerberos_module);