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
37 #include <linux/err.h>
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);
79 res->data = kmemdup(p, len, GFP_KERNEL);
80 if (unlikely(res->data == NULL))
81 return ERR_PTR(-ENOMEM);
82 return q;
83 }
84
85 static int
86 gss_import_sec_context_spkm3(const void *p, size_t len,
87 struct gss_ctx *ctx_id)
88 {
89 const void *end = (const void *)((const char *)p + len);
90 struct spkm3_ctx *ctx;
91 int version;
92
93 if (!(ctx = kzalloc(sizeof(*ctx), GFP_KERNEL)))
94 goto out_err;
95
96 p = simple_get_bytes(p, end, &version, sizeof(version));
97 if (IS_ERR(p))
98 goto out_err_free_ctx;
99 if (version != 1) {
100 dprintk("RPC: unknown spkm3 token format: "
101 "obsolete nfs-utils?\n");
102 goto out_err_free_ctx;
103 }
104
105 p = simple_get_netobj(p, end, &ctx->ctx_id);
106 if (IS_ERR(p))
107 goto out_err_free_ctx;
108
109 p = simple_get_bytes(p, end, &ctx->endtime, sizeof(ctx->endtime));
110 if (IS_ERR(p))
111 goto out_err_free_ctx_id;
112
113 p = simple_get_netobj(p, end, &ctx->mech_used);
114 if (IS_ERR(p))
115 goto out_err_free_ctx_id;
116
117 p = simple_get_bytes(p, end, &ctx->ret_flags, sizeof(ctx->ret_flags));
118 if (IS_ERR(p))
119 goto out_err_free_mech;
120
121 p = simple_get_netobj(p, end, &ctx->conf_alg);
122 if (IS_ERR(p))
123 goto out_err_free_mech;
124
125 p = simple_get_netobj(p, end, &ctx->derived_conf_key);
126 if (IS_ERR(p))
127 goto out_err_free_conf_alg;
128
129 p = simple_get_netobj(p, end, &ctx->intg_alg);
130 if (IS_ERR(p))
131 goto out_err_free_conf_key;
132
133 p = simple_get_netobj(p, end, &ctx->derived_integ_key);
134 if (IS_ERR(p))
135 goto out_err_free_intg_alg;
136
137 if (p != end)
138 goto out_err_free_intg_key;
139
140 ctx_id->internal_ctx_id = ctx;
141
142 dprintk("RPC: Successfully imported new spkm context.\n");
143 return 0;
144
145 out_err_free_intg_key:
146 kfree(ctx->derived_integ_key.data);
147 out_err_free_intg_alg:
148 kfree(ctx->intg_alg.data);
149 out_err_free_conf_key:
150 kfree(ctx->derived_conf_key.data);
151 out_err_free_conf_alg:
152 kfree(ctx->conf_alg.data);
153 out_err_free_mech:
154 kfree(ctx->mech_used.data);
155 out_err_free_ctx_id:
156 kfree(ctx->ctx_id.data);
157 out_err_free_ctx:
158 kfree(ctx);
159 out_err:
160 return PTR_ERR(p);
161 }
162
163 static void
164 gss_delete_sec_context_spkm3(void *internal_ctx)
165 {
166 struct spkm3_ctx *sctx = internal_ctx;
167
168 kfree(sctx->derived_integ_key.data);
169 kfree(sctx->intg_alg.data);
170 kfree(sctx->derived_conf_key.data);
171 kfree(sctx->conf_alg.data);
172 kfree(sctx->mech_used.data);
173 kfree(sctx->ctx_id.data);
174 kfree(sctx);
175 }
176
177 static u32
178 gss_verify_mic_spkm3(struct gss_ctx *ctx,
179 struct xdr_buf *signbuf,
180 struct xdr_netobj *checksum)
181 {
182 u32 maj_stat = 0;
183 struct spkm3_ctx *sctx = ctx->internal_ctx_id;
184
185 maj_stat = spkm3_read_token(sctx, checksum, signbuf, SPKM_MIC_TOK);
186
187 dprintk("RPC: gss_verify_mic_spkm3 returning %d\n", maj_stat);
188 return maj_stat;
189 }
190
191 static u32
192 gss_get_mic_spkm3(struct gss_ctx *ctx,
193 struct xdr_buf *message_buffer,
194 struct xdr_netobj *message_token)
195 {
196 u32 err = 0;
197 struct spkm3_ctx *sctx = ctx->internal_ctx_id;
198
199 err = spkm3_make_token(sctx, message_buffer,
200 message_token, SPKM_MIC_TOK);
201 dprintk("RPC: gss_get_mic_spkm3 returning %d\n", err);
202 return err;
203 }
204
205 static const struct gss_api_ops gss_spkm3_ops = {
206 .gss_import_sec_context = gss_import_sec_context_spkm3,
207 .gss_get_mic = gss_get_mic_spkm3,
208 .gss_verify_mic = gss_verify_mic_spkm3,
209 .gss_delete_sec_context = gss_delete_sec_context_spkm3,
210 };
211
212 static struct pf_desc gss_spkm3_pfs[] = {
213 {RPC_AUTH_GSS_SPKM, RPC_GSS_SVC_NONE, "spkm3"},
214 {RPC_AUTH_GSS_SPKMI, RPC_GSS_SVC_INTEGRITY, "spkm3i"},
215 };
216
217 static struct gss_api_mech gss_spkm3_mech = {
218 .gm_name = "spkm3",
219 .gm_owner = THIS_MODULE,
220 .gm_oid = {7, "\053\006\001\005\005\001\003"},
221 .gm_ops = &gss_spkm3_ops,
222 .gm_pf_num = ARRAY_SIZE(gss_spkm3_pfs),
223 .gm_pfs = gss_spkm3_pfs,
224 };
225
226 static int __init init_spkm3_module(void)
227 {
228 int status;
229
230 status = gss_mech_register(&gss_spkm3_mech);
231 if (status)
232 printk("Failed to register spkm3 gss mechanism!\n");
233 return status;
234 }
235
236 static void __exit cleanup_spkm3_module(void)
237 {
238 gss_mech_unregister(&gss_spkm3_mech);
239 }
240
241 MODULE_LICENSE("GPL");
242 module_init(init_spkm3_module);
243 module_exit(cleanup_spkm3_module);
244
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