[net-next-2.6.git] / net / sunrpc / auth_gss / gss_spkm3_mech.c

/*
 *  linux/net/sunrpc/gss_spkm3_mech.c
 *
 *  Copyright (c) 2003 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/in.h>
#include <linux/sunrpc/svcauth_gss.h>
#include <linux/sunrpc/gss_spkm3.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;
	res->len = len;
	if (len == 0) {
		res->data = NULL;
		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_NOFS);
	if (unlikely(res->data == NULL))
		return ERR_PTR(-ENOMEM);
	return q;
}

static int
gss_import_sec_context_spkm3(const void *p, size_t len,
				struct gss_ctx *ctx_id,
				gfp_t gfp_mask)
{
	const void *end = (const void *)((const char *)p + len);
	struct	spkm3_ctx *ctx;
	int	version;

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

	p = simple_get_bytes(p, end, &version, sizeof(version));
	if (IS_ERR(p))
		goto out_err_free_ctx;
	if (version != 1) {
		dprintk("RPC:       unknown spkm3 token format: "
				"obsolete nfs-utils?\n");
		p = ERR_PTR(-EINVAL);
		goto out_err_free_ctx;
	}

	p = simple_get_netobj(p, end, &ctx->ctx_id);
	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_id;

	p = simple_get_netobj(p, end, &ctx->mech_used);
	if (IS_ERR(p))
		goto out_err_free_ctx_id;

	p = simple_get_bytes(p, end, &ctx->ret_flags, sizeof(ctx->ret_flags));
	if (IS_ERR(p))
		goto out_err_free_mech;

	p = simple_get_netobj(p, end, &ctx->conf_alg);
	if (IS_ERR(p))
		goto out_err_free_mech;

	p = simple_get_netobj(p, end, &ctx->derived_conf_key);
	if (IS_ERR(p))
		goto out_err_free_conf_alg;

	p = simple_get_netobj(p, end, &ctx->intg_alg);
	if (IS_ERR(p))
		goto out_err_free_conf_key;

	p = simple_get_netobj(p, end, &ctx->derived_integ_key);
	if (IS_ERR(p))
		goto out_err_free_intg_alg;

	if (p != end) {
		p = ERR_PTR(-EFAULT);
		goto out_err_free_intg_key;
	}

	ctx_id->internal_ctx_id = ctx;

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

out_err_free_intg_key:
	kfree(ctx->derived_integ_key.data);
out_err_free_intg_alg:
	kfree(ctx->intg_alg.data);
out_err_free_conf_key:
	kfree(ctx->derived_conf_key.data);
out_err_free_conf_alg:
	kfree(ctx->conf_alg.data);
out_err_free_mech:
	kfree(ctx->mech_used.data);
out_err_free_ctx_id:
	kfree(ctx->ctx_id.data);
out_err_free_ctx:
	kfree(ctx);
out_err:
	return PTR_ERR(p);
}

static void
gss_delete_sec_context_spkm3(void *internal_ctx)
{
	struct spkm3_ctx *sctx = internal_ctx;

	kfree(sctx->derived_integ_key.data);
	kfree(sctx->intg_alg.data);
	kfree(sctx->derived_conf_key.data);
	kfree(sctx->conf_alg.data);
	kfree(sctx->mech_used.data);
	kfree(sctx->ctx_id.data);
	kfree(sctx);
}

static u32
gss_verify_mic_spkm3(struct gss_ctx		*ctx,
			struct xdr_buf		*signbuf,
			struct xdr_netobj	*checksum)
{
	u32 maj_stat = 0;
	struct spkm3_ctx *sctx = ctx->internal_ctx_id;

	maj_stat = spkm3_read_token(sctx, checksum, signbuf, SPKM_MIC_TOK);

	dprintk("RPC:       gss_verify_mic_spkm3 returning %d\n", maj_stat);
	return maj_stat;
}

static u32
gss_get_mic_spkm3(struct gss_ctx	*ctx,
		     struct xdr_buf	*message_buffer,
		     struct xdr_netobj	*message_token)
{
	u32 err = 0;
	struct spkm3_ctx *sctx = ctx->internal_ctx_id;

	err = spkm3_make_token(sctx, message_buffer,
				message_token, SPKM_MIC_TOK);
	dprintk("RPC:       gss_get_mic_spkm3 returning %d\n", err);
	return err;
}

static const struct gss_api_ops gss_spkm3_ops = {
	.gss_import_sec_context	= gss_import_sec_context_spkm3,
	.gss_get_mic		= gss_get_mic_spkm3,
	.gss_verify_mic		= gss_verify_mic_spkm3,
	.gss_delete_sec_context	= gss_delete_sec_context_spkm3,
};

static struct pf_desc gss_spkm3_pfs[] = {
	{RPC_AUTH_GSS_SPKM, RPC_GSS_SVC_NONE, "spkm3"},
	{RPC_AUTH_GSS_SPKMI, RPC_GSS_SVC_INTEGRITY, "spkm3i"},
};

static struct gss_api_mech gss_spkm3_mech = {
	.gm_name	= "spkm3",
	.gm_owner	= THIS_MODULE,
	.gm_oid		= {7, "\053\006\001\005\005\001\003"},
	.gm_ops		= &gss_spkm3_ops,
	.gm_pf_num	= ARRAY_SIZE(gss_spkm3_pfs),
	.gm_pfs		= gss_spkm3_pfs,
};

static int __init init_spkm3_module(void)
{
	int status;

	status = gss_mech_register(&gss_spkm3_mech);
	if (status)
		printk("Failed to register spkm3 gss mechanism!\n");
	return status;
}

static void __exit cleanup_spkm3_module(void)
{
	gss_mech_unregister(&gss_spkm3_mech);
}

MODULE_LICENSE("GPL");
module_init(init_spkm3_module);
module_exit(cleanup_spkm3_module);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/net/sunrpc/gss_spkm3_mech.c
	3	*
	4	* Copyright (c) 2003 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>
	43	#include <linux/in.h>
	44	#include <linux/sunrpc/svcauth_gss.h>
	45	#include <linux/sunrpc/gss_spkm3.h>
	46	#include <linux/sunrpc/xdr.h>
	47	#include <linux/crypto.h>
	48
	49	#ifdef RPC_DEBUG
	50	# define RPCDBG_FACILITY RPCDBG_AUTH
	51	#endif
	52
	53	static const void *
	54	simple_get_bytes(const void p, const void end, void *res, int len)
	55	{
	56	const void q = (const void )((const char *)p + len);
	57	if (unlikely(q > end \|\| q < p))
	58	return ERR_PTR(-EFAULT);
	59	memcpy(res, p, len);
	60	return q;
	61	}
	62
	63	static const void *
	64	simple_get_netobj(const void p, const void end, struct xdr_netobj *res)
	65	{
	66	const void *q;
	67	unsigned int len;
	68	p = simple_get_bytes(p, end, &len, sizeof(len));
	69	if (IS_ERR(p))
	70	return p;
	71	res->len = len;
	72	if (len == 0) {
	73	res->data = NULL;
	74	return p;
	75	}
	76	q = (const void )((const char )p + len);
	77	if (unlikely(q > end \|\| q < p))
	78	return ERR_PTR(-EFAULT);
0f38b873	79	res->data = kmemdup(p, len, GFP_NOFS);
1da177e4 LT	80	if (unlikely(res->data == NULL))
1da177e4 LT	81	return ERR_PTR(-ENOMEM);
1da177e4 LT	82	return q;
	83	}
	84
1da177e4 LT	85	static int
1da177e4 LT	86	gss_import_sec_context_spkm3(const void *p, size_t len,
1f4c86c0 TM	87	struct gss_ctx *ctx_id,
1f4c86c0 TM	88	gfp_t gfp_mask)
1da177e4 LT	89	{
	90	const void end = (const void )((const char *)p + len);
	91	struct spkm3_ctx *ctx;
adeb8133	92	int version;
1da177e4	93
1f4c86c0	94	if (!(ctx = kzalloc(sizeof(*ctx), gfp_mask)))
1da177e4	95	goto out_err;
1da177e4	96
adeb8133 OK	97	p = simple_get_bytes(p, end, &version, sizeof(version));
	98	if (IS_ERR(p))
	99	goto out_err_free_ctx;
	100	if (version != 1) {
8885cb36 CL	101	dprintk("RPC: unknown spkm3 token format: "
8885cb36 CL	102	"obsolete nfs-utils?\n");
651b2933	103	p = ERR_PTR(-EINVAL);
adeb8133 OK	104	goto out_err_free_ctx;
	105	}
	106
1da177e4 LT	107	p = simple_get_netobj(p, end, &ctx->ctx_id);
	108	if (IS_ERR(p))
	109	goto out_err_free_ctx;
	110
adeb8133	111	p = simple_get_bytes(p, end, &ctx->endtime, sizeof(ctx->endtime));
1da177e4 LT	112	if (IS_ERR(p))
	113	goto out_err_free_ctx_id;
	114
	115	p = simple_get_netobj(p, end, &ctx->mech_used);
	116	if (IS_ERR(p))
adeb8133	117	goto out_err_free_ctx_id;
1da177e4 LT	118
	119	p = simple_get_bytes(p, end, &ctx->ret_flags, sizeof(ctx->ret_flags));
	120	if (IS_ERR(p))
	121	goto out_err_free_mech;
	122
adeb8133	123	p = simple_get_netobj(p, end, &ctx->conf_alg);
1da177e4 LT	124	if (IS_ERR(p))
	125	goto out_err_free_mech;
	126
adeb8133	127	p = simple_get_netobj(p, end, &ctx->derived_conf_key);
1da177e4	128	if (IS_ERR(p))
adeb8133	129	goto out_err_free_conf_alg;
1da177e4	130
adeb8133	131	p = simple_get_netobj(p, end, &ctx->intg_alg);
1da177e4	132	if (IS_ERR(p))
adeb8133	133	goto out_err_free_conf_key;
1da177e4	134
adeb8133	135	p = simple_get_netobj(p, end, &ctx->derived_integ_key);
1da177e4	136	if (IS_ERR(p))
adeb8133	137	goto out_err_free_intg_alg;
1da177e4	138
651b2933 BN	139	if (p != end) {
651b2933 BN	140	p = ERR_PTR(-EFAULT);
adeb8133	141	goto out_err_free_intg_key;
651b2933	142	}
1da177e4 LT	143
	144	ctx_id->internal_ctx_id = ctx;
	145
8885cb36	146	dprintk("RPC: Successfully imported new spkm context.\n");
1da177e4 LT	147	return 0;
1da177e4 LT	148
adeb8133 OK	149	out_err_free_intg_key:
	150	kfree(ctx->derived_integ_key.data);
	151	out_err_free_intg_alg:
	152	kfree(ctx->intg_alg.data);
	153	out_err_free_conf_key:
	154	kfree(ctx->derived_conf_key.data);
	155	out_err_free_conf_alg:
	156	kfree(ctx->conf_alg.data);
1da177e4 LT	157	out_err_free_mech:
	158	kfree(ctx->mech_used.data);
	159	out_err_free_ctx_id:
	160	kfree(ctx->ctx_id.data);
	161	out_err_free_ctx:
	162	kfree(ctx);
	163	out_err:
	164	return PTR_ERR(p);
	165	}
	166
	167	static void
adeb8133 OK	168	gss_delete_sec_context_spkm3(void *internal_ctx)
adeb8133 OK	169	{
1da177e4 LT	170	struct spkm3_ctx *sctx = internal_ctx;
1da177e4 LT	171
adeb8133 OK	172	kfree(sctx->derived_integ_key.data);
	173	kfree(sctx->intg_alg.data);
	174	kfree(sctx->derived_conf_key.data);
	175	kfree(sctx->conf_alg.data);
573dbd95	176	kfree(sctx->mech_used.data);
adeb8133	177	kfree(sctx->ctx_id.data);
1da177e4 LT	178	kfree(sctx);
	179	}
	180
	181	static u32
	182	gss_verify_mic_spkm3(struct gss_ctx *ctx,
	183	struct xdr_buf *signbuf,
00fd6e14 BF	184	struct xdr_netobj *checksum)
00fd6e14 BF	185	{
1da177e4	186	u32 maj_stat = 0;
1da177e4 LT	187	struct spkm3_ctx *sctx = ctx->internal_ctx_id;
1da177e4 LT	188
00fd6e14	189	maj_stat = spkm3_read_token(sctx, checksum, signbuf, SPKM_MIC_TOK);
1da177e4	190
8885cb36	191	dprintk("RPC: gss_verify_mic_spkm3 returning %d\n", maj_stat);
1da177e4 LT	192	return maj_stat;
	193	}
	194
	195	static u32
	196	gss_get_mic_spkm3(struct gss_ctx *ctx,
1da177e4	197	struct xdr_buf *message_buffer,
00fd6e14 BF	198	struct xdr_netobj *message_token)
00fd6e14 BF	199	{
1da177e4 LT	200	u32 err = 0;
	201	struct spkm3_ctx *sctx = ctx->internal_ctx_id;
	202
00fd6e14	203	err = spkm3_make_token(sctx, message_buffer,
adeb8133	204	message_token, SPKM_MIC_TOK);
8885cb36	205	dprintk("RPC: gss_get_mic_spkm3 returning %d\n", err);
1da177e4 LT	206	return err;
	207	}
	208
f1c0a861	209	static const struct gss_api_ops gss_spkm3_ops = {
1da177e4 LT	210	.gss_import_sec_context = gss_import_sec_context_spkm3,
	211	.gss_get_mic = gss_get_mic_spkm3,
	212	.gss_verify_mic = gss_verify_mic_spkm3,
	213	.gss_delete_sec_context = gss_delete_sec_context_spkm3,
	214	};
	215
	216	static struct pf_desc gss_spkm3_pfs[] = {
00fd6e14 BF	217	{RPC_AUTH_GSS_SPKM, RPC_GSS_SVC_NONE, "spkm3"},
00fd6e14 BF	218	{RPC_AUTH_GSS_SPKMI, RPC_GSS_SVC_INTEGRITY, "spkm3i"},
1da177e4 LT	219	};
	220
	221	static struct gss_api_mech gss_spkm3_mech = {
	222	.gm_name = "spkm3",
	223	.gm_owner = THIS_MODULE,
ae4c40b1	224	.gm_oid = {7, "\053\006\001\005\005\001\003"},
1da177e4 LT	225	.gm_ops = &gss_spkm3_ops,
	226	.gm_pf_num = ARRAY_SIZE(gss_spkm3_pfs),
	227	.gm_pfs = gss_spkm3_pfs,
	228	};
	229
	230	static int __init init_spkm3_module(void)
	231	{
	232	int status;
	233
	234	status = gss_mech_register(&gss_spkm3_mech);
	235	if (status)
	236	printk("Failed to register spkm3 gss mechanism!\n");
fadfc8e9	237	return status;
1da177e4 LT	238	}
	239
	240	static void __exit cleanup_spkm3_module(void)
	241	{
	242	gss_mech_unregister(&gss_spkm3_mech);
	243	}
	244
	245	MODULE_LICENSE("GPL");
	246	module_init(init_spkm3_module);
	247	module_exit(cleanup_spkm3_module);