linux/net/sunrpc/auth_gss/gss_spkm3_mech.c
Olga Kornievskaia adeb8133dd rpc: spkm3 update
This updates the spkm3 code to bring it up to date with our current
understanding of the spkm3 spec.

In doing so, we're changing the downcall format used by gssd in the spkm3 case,
which will cause an incompatilibity with old userland spkm3 support.  Since the
old code a) didn't implement the protocol correctly, and b) was never
distributed except in the form of some experimental patches from the citi web
site, we're assuming this is OK.

We do detect the old downcall format and print warning (and fail).  We also
include a version number in the new downcall format, to be used in the
future in case any further change is required.

In some more detail:

	- fix integrity support
	- removed dependency on NIDs. instead OIDs are used
	- known OID values for algorithms added.
	- fixed some context fields and types

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2006-12-06 10:46:44 -05:00

242 lines
6.4 KiB
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_KERNEL);
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)
{
const void *end = (const void *)((const char *)p + len);
struct spkm3_ctx *ctx;
int version;
if (!(ctx = kzalloc(sizeof(*ctx), GFP_KERNEL)))
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");
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)
goto out_err_free_intg_key;
ctx_id->internal_ctx_id = ctx;
dprintk("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 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_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 0;
}
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);