2 * linux/net/sunrpc/gss_spkm3_mech.c
4 * Copyright (c) 2003 The Regents of the University of Michigan.
7 * Andy Adamson <andros@umich.edu>
8 * J. Bruce Fields <bfields@umich.edu>
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
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.
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.
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>
43 #include <linux/sunrpc/svcauth_gss.h>
44 #include <linux/sunrpc/gss_spkm3.h>
45 #include <linux/sunrpc/xdr.h>
46 #include <linux/crypto.h>
49 # define RPCDBG_FACILITY RPCDBG_AUTH
53 simple_get_bytes(const void *p, const void *end, void *res, int len)
55 const void *q = (const void *)((const char *)p + len);
56 if (unlikely(q > end || q < p))
57 return ERR_PTR(-EFAULT);
63 simple_get_netobj(const void *p, const void *end, struct xdr_netobj *res)
67 p = simple_get_bytes(p, end, &len, sizeof(len));
75 q = (const void *)((const char *)p + len);
76 if (unlikely(q > end || q < p))
77 return ERR_PTR(-EFAULT);
78 res->data = kmalloc(len, GFP_KERNEL);
79 if (unlikely(res->data == NULL))
80 return ERR_PTR(-ENOMEM);
81 memcpy(res->data, p, len);
85 static inline const void *
86 get_key(const void *p, const void *end, struct crypto_tfm **res, int *resalg)
88 struct xdr_netobj key = { 0 };
89 int alg_mode,setkey = 0;
92 p = simple_get_bytes(p, end, resalg, sizeof(*resalg));
95 p = simple_get_netobj(p, end, &key);
102 alg_mode = CRYPTO_TFM_MODE_CBC;
107 dprintk("RPC: SPKM3 get_key: NID_md5 zero Key length\n");
114 dprintk("gss_spkm3_mech: unsupported algorithm %d\n", *resalg);
115 goto out_err_free_key;
117 if (!(*res = crypto_alloc_tfm(alg_name, alg_mode))) {
118 printk("gss_spkm3_mech: unable to initialize crypto algorthm %s\n", alg_name);
119 goto out_err_free_key;
122 if (crypto_cipher_setkey(*res, key.data, key.len)) {
123 printk("gss_spkm3_mech: error setting key for crypto algorthm %s\n", alg_name);
124 goto out_err_free_tfm;
133 crypto_free_tfm(*res);
137 p = ERR_PTR(-EINVAL);
143 gss_import_sec_context_spkm3(const void *p, size_t len,
144 struct gss_ctx *ctx_id)
146 const void *end = (const void *)((const char *)p + len);
147 struct spkm3_ctx *ctx;
149 if (!(ctx = kmalloc(sizeof(*ctx), GFP_KERNEL)))
151 memset(ctx, 0, sizeof(*ctx));
153 p = simple_get_netobj(p, end, &ctx->ctx_id);
155 goto out_err_free_ctx;
157 p = simple_get_bytes(p, end, &ctx->qop, sizeof(ctx->qop));
159 goto out_err_free_ctx_id;
161 p = simple_get_netobj(p, end, &ctx->mech_used);
163 goto out_err_free_mech;
165 p = simple_get_bytes(p, end, &ctx->ret_flags, sizeof(ctx->ret_flags));
167 goto out_err_free_mech;
169 p = simple_get_bytes(p, end, &ctx->req_flags, sizeof(ctx->req_flags));
171 goto out_err_free_mech;
173 p = simple_get_netobj(p, end, &ctx->share_key);
175 goto out_err_free_s_key;
177 p = get_key(p, end, &ctx->derived_conf_key, &ctx->conf_alg);
179 goto out_err_free_s_key;
181 p = get_key(p, end, &ctx->derived_integ_key, &ctx->intg_alg);
183 goto out_err_free_key1;
185 p = simple_get_bytes(p, end, &ctx->keyestb_alg, sizeof(ctx->keyestb_alg));
187 goto out_err_free_key2;
189 p = simple_get_bytes(p, end, &ctx->owf_alg, sizeof(ctx->owf_alg));
191 goto out_err_free_key2;
194 goto out_err_free_key2;
196 ctx_id->internal_ctx_id = ctx;
198 dprintk("Succesfully imported new spkm context.\n");
202 crypto_free_tfm(ctx->derived_integ_key);
204 crypto_free_tfm(ctx->derived_conf_key);
206 kfree(ctx->share_key.data);
208 kfree(ctx->mech_used.data);
210 kfree(ctx->ctx_id.data);
218 gss_delete_sec_context_spkm3(void *internal_ctx) {
219 struct spkm3_ctx *sctx = internal_ctx;
221 crypto_free_tfm(sctx->derived_integ_key);
222 crypto_free_tfm(sctx->derived_conf_key);
223 kfree(sctx->share_key.data);
224 kfree(sctx->mech_used.data);
229 gss_verify_mic_spkm3(struct gss_ctx *ctx,
230 struct xdr_buf *signbuf,
231 struct xdr_netobj *checksum)
234 struct spkm3_ctx *sctx = ctx->internal_ctx_id;
236 dprintk("RPC: gss_verify_mic_spkm3 calling spkm3_read_token\n");
237 maj_stat = spkm3_read_token(sctx, checksum, signbuf, SPKM_MIC_TOK);
239 dprintk("RPC: gss_verify_mic_spkm3 returning %d\n", maj_stat);
244 gss_get_mic_spkm3(struct gss_ctx *ctx,
245 struct xdr_buf *message_buffer,
246 struct xdr_netobj *message_token)
249 struct spkm3_ctx *sctx = ctx->internal_ctx_id;
251 dprintk("RPC: gss_get_mic_spkm3\n");
253 err = spkm3_make_token(sctx, message_buffer,
254 message_token, SPKM_MIC_TOK);
258 static struct gss_api_ops gss_spkm3_ops = {
259 .gss_import_sec_context = gss_import_sec_context_spkm3,
260 .gss_get_mic = gss_get_mic_spkm3,
261 .gss_verify_mic = gss_verify_mic_spkm3,
262 .gss_delete_sec_context = gss_delete_sec_context_spkm3,
265 static struct pf_desc gss_spkm3_pfs[] = {
266 {RPC_AUTH_GSS_SPKM, RPC_GSS_SVC_NONE, "spkm3"},
267 {RPC_AUTH_GSS_SPKMI, RPC_GSS_SVC_INTEGRITY, "spkm3i"},
270 static struct gss_api_mech gss_spkm3_mech = {
272 .gm_owner = THIS_MODULE,
273 .gm_ops = &gss_spkm3_ops,
274 .gm_pf_num = ARRAY_SIZE(gss_spkm3_pfs),
275 .gm_pfs = gss_spkm3_pfs,
278 static int __init init_spkm3_module(void)
282 status = gss_mech_register(&gss_spkm3_mech);
284 printk("Failed to register spkm3 gss mechanism!\n");
288 static void __exit cleanup_spkm3_module(void)
290 gss_mech_unregister(&gss_spkm3_mech);
293 MODULE_LICENSE("GPL");
294 module_init(init_spkm3_module);
295 module_exit(cleanup_spkm3_module);