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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Herbert Xu378c6692006-08-22 20:33:54 +100037#include <linux/err.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070038#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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070043#include <linux/sunrpc/gss_krb5.h>
44#include <linux/sunrpc/xdr.h>
45#include <linux/crypto.h>
46
47#ifdef RPC_DEBUG
48# define RPCDBG_FACILITY RPCDBG_AUTH
49#endif
50
51static const void *
52simple_get_bytes(const void *p, const void *end, void *res, int len)
53{
54 const void *q = (const void *)((const char *)p + len);
55 if (unlikely(q > end || q < p))
56 return ERR_PTR(-EFAULT);
57 memcpy(res, p, len);
58 return q;
59}
60
61static const void *
62simple_get_netobj(const void *p, const void *end, struct xdr_netobj *res)
63{
64 const void *q;
65 unsigned int len;
66
67 p = simple_get_bytes(p, end, &len, sizeof(len));
68 if (IS_ERR(p))
69 return p;
70 q = (const void *)((const char *)p + len);
71 if (unlikely(q > end || q < p))
72 return ERR_PTR(-EFAULT);
Trond Myklebust0f38b872008-06-10 18:31:01 -040073 res->data = kmemdup(p, len, GFP_NOFS);
Linus Torvalds1da177e2005-04-16 15:20:36 -070074 if (unlikely(res->data == NULL))
75 return ERR_PTR(-ENOMEM);
Linus Torvalds1da177e2005-04-16 15:20:36 -070076 res->len = len;
77 return q;
78}
79
80static inline const void *
Herbert Xu378c6692006-08-22 20:33:54 +100081get_key(const void *p, const void *end, struct crypto_blkcipher **res)
Linus Torvalds1da177e2005-04-16 15:20:36 -070082{
83 struct xdr_netobj key;
Herbert Xu378c6692006-08-22 20:33:54 +100084 int alg;
Linus Torvalds1da177e2005-04-16 15:20:36 -070085 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:
Herbert Xu378c6692006-08-22 20:33:54 +100096 alg_name = "cbc(des)";
Linus Torvalds1da177e2005-04-16 15:20:36 -070097 break;
98 default:
J. Bruce Fields9e569042006-01-03 09:56:01 +010099 printk("gss_kerberos_mech: unsupported algorithm %d\n", alg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100 goto out_err_free_key;
101 }
Herbert Xu378c6692006-08-22 20:33:54 +1000102 *res = crypto_alloc_blkcipher(alg_name, 0, CRYPTO_ALG_ASYNC);
103 if (IS_ERR(*res)) {
J. Bruce Fields9e569042006-01-03 09:56:01 +0100104 printk("gss_kerberos_mech: unable to initialize crypto algorithm %s\n", alg_name);
Herbert Xu378c6692006-08-22 20:33:54 +1000105 *res = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106 goto out_err_free_key;
J. Bruce Fields9e569042006-01-03 09:56:01 +0100107 }
Herbert Xu378c6692006-08-22 20:33:54 +1000108 if (crypto_blkcipher_setkey(*res, key.data, key.len)) {
J. Bruce Fields9e569042006-01-03 09:56:01 +0100109 printk("gss_kerberos_mech: error setting key for crypto algorithm %s\n", alg_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110 goto out_err_free_tfm;
J. Bruce Fields9e569042006-01-03 09:56:01 +0100111 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112
113 kfree(key.data);
114 return p;
115
116out_err_free_tfm:
Herbert Xu378c6692006-08-22 20:33:54 +1000117 crypto_free_blkcipher(*res);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118out_err_free_key:
119 kfree(key.data);
120 p = ERR_PTR(-EINVAL);
121out_err:
122 return p;
123}
124
125static int
126gss_import_sec_context_kerberos(const void *p,
127 size_t len,
128 struct gss_ctx *ctx_id)
129{
130 const void *end = (const void *)((const char *)p + len);
131 struct krb5_ctx *ctx;
J. Bruce Fieldse678e062006-12-04 20:22:35 -0500132 int tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133
Trond Myklebust0f38b872008-06-10 18:31:01 -0400134 if (!(ctx = kzalloc(sizeof(*ctx), GFP_NOFS)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 goto out_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136
137 p = simple_get_bytes(p, end, &ctx->initiate, sizeof(ctx->initiate));
138 if (IS_ERR(p))
139 goto out_err_free_ctx;
J. Bruce Fields717757a2006-12-04 20:22:41 -0500140 /* The downcall format was designed before we completely understood
141 * the uses of the context fields; so it includes some stuff we
142 * just give some minimal sanity-checking, and some we ignore
143 * completely (like the next twenty bytes): */
144 if (unlikely(p + 20 > end || p + 20 < p))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 goto out_err_free_ctx;
J. Bruce Fields717757a2006-12-04 20:22:41 -0500146 p += 20;
J. Bruce Fieldse678e062006-12-04 20:22:35 -0500147 p = simple_get_bytes(p, end, &tmp, sizeof(tmp));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 if (IS_ERR(p))
149 goto out_err_free_ctx;
Kevin Coffmanef338be2007-11-09 18:42:09 -0500150 if (tmp != SGN_ALG_DES_MAC_MD5) {
151 p = ERR_PTR(-ENOSYS);
J. Bruce Fieldse678e062006-12-04 20:22:35 -0500152 goto out_err_free_ctx;
Kevin Coffmanef338be2007-11-09 18:42:09 -0500153 }
J. Bruce Fieldsd922a842006-12-04 20:22:40 -0500154 p = simple_get_bytes(p, end, &tmp, sizeof(tmp));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 if (IS_ERR(p))
156 goto out_err_free_ctx;
Kevin Coffmanef338be2007-11-09 18:42:09 -0500157 if (tmp != SEAL_ALG_DES) {
158 p = ERR_PTR(-ENOSYS);
J. Bruce Fieldsd922a842006-12-04 20:22:40 -0500159 goto out_err_free_ctx;
Kevin Coffmanef338be2007-11-09 18:42:09 -0500160 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 p = simple_get_bytes(p, end, &ctx->endtime, sizeof(ctx->endtime));
162 if (IS_ERR(p))
163 goto out_err_free_ctx;
164 p = simple_get_bytes(p, end, &ctx->seq_send, sizeof(ctx->seq_send));
165 if (IS_ERR(p))
166 goto out_err_free_ctx;
167 p = simple_get_netobj(p, end, &ctx->mech_used);
168 if (IS_ERR(p))
169 goto out_err_free_ctx;
170 p = get_key(p, end, &ctx->enc);
171 if (IS_ERR(p))
172 goto out_err_free_mech;
173 p = get_key(p, end, &ctx->seq);
174 if (IS_ERR(p))
175 goto out_err_free_key1;
176 if (p != end) {
177 p = ERR_PTR(-EFAULT);
178 goto out_err_free_key2;
179 }
180
181 ctx_id->internal_ctx_id = ctx;
Chuck Lever8885cb32007-01-31 12:14:05 -0500182
183 dprintk("RPC: Successfully imported new context.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 return 0;
185
186out_err_free_key2:
Herbert Xu378c6692006-08-22 20:33:54 +1000187 crypto_free_blkcipher(ctx->seq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188out_err_free_key1:
Herbert Xu378c6692006-08-22 20:33:54 +1000189 crypto_free_blkcipher(ctx->enc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190out_err_free_mech:
191 kfree(ctx->mech_used.data);
192out_err_free_ctx:
193 kfree(ctx);
194out_err:
195 return PTR_ERR(p);
196}
197
198static void
199gss_delete_sec_context_kerberos(void *internal_ctx) {
200 struct krb5_ctx *kctx = internal_ctx;
201
Herbert Xu378c6692006-08-22 20:33:54 +1000202 crypto_free_blkcipher(kctx->seq);
203 crypto_free_blkcipher(kctx->enc);
Jesper Juhl573dbd92005-09-01 17:44:29 -0700204 kfree(kctx->mech_used.data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205 kfree(kctx);
206}
207
Trond Myklebustf1c0a862007-06-23 20:17:58 -0400208static const struct gss_api_ops gss_kerberos_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 .gss_import_sec_context = gss_import_sec_context_kerberos,
210 .gss_get_mic = gss_get_mic_kerberos,
211 .gss_verify_mic = gss_verify_mic_kerberos,
J. Bruce Fields14ae1622005-10-13 16:55:13 -0400212 .gss_wrap = gss_wrap_kerberos,
213 .gss_unwrap = gss_unwrap_kerberos,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 .gss_delete_sec_context = gss_delete_sec_context_kerberos,
215};
216
217static struct pf_desc gss_kerberos_pfs[] = {
218 [0] = {
219 .pseudoflavor = RPC_AUTH_GSS_KRB5,
220 .service = RPC_GSS_SVC_NONE,
221 .name = "krb5",
222 },
223 [1] = {
224 .pseudoflavor = RPC_AUTH_GSS_KRB5I,
225 .service = RPC_GSS_SVC_INTEGRITY,
226 .name = "krb5i",
227 },
J. Bruce Fields14ae1622005-10-13 16:55:13 -0400228 [2] = {
229 .pseudoflavor = RPC_AUTH_GSS_KRB5P,
230 .service = RPC_GSS_SVC_PRIVACY,
231 .name = "krb5p",
232 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233};
234
235static struct gss_api_mech gss_kerberos_mech = {
236 .gm_name = "krb5",
237 .gm_owner = THIS_MODULE,
Usha Ketineniae4c40b2007-07-17 04:04:50 -0700238 .gm_oid = {9, (void *)"\x2a\x86\x48\x86\xf7\x12\x01\x02\x02"},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239 .gm_ops = &gss_kerberos_ops,
240 .gm_pf_num = ARRAY_SIZE(gss_kerberos_pfs),
241 .gm_pfs = gss_kerberos_pfs,
242};
243
244static int __init init_kerberos_module(void)
245{
246 int status;
247
248 status = gss_mech_register(&gss_kerberos_mech);
249 if (status)
250 printk("Failed to register kerberos gss mechanism!\n");
251 return status;
252}
253
254static void __exit cleanup_kerberos_module(void)
255{
256 gss_mech_unregister(&gss_kerberos_mech);
257}
258
259MODULE_LICENSE("GPL");
260module_init(init_kerberos_module);
261module_exit(cleanup_kerberos_module);