blob: cf726510df8e5ad2d6075b8547245f85666d59eb [file] [log] [blame]
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
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>
42#include <linux/in.h>
43#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);
73 res->data = kmalloc(len, GFP_KERNEL);
74 if (unlikely(res->data == NULL))
75 return ERR_PTR(-ENOMEM);
76 memcpy(res->data, p, len);
77 res->len = len;
78 return q;
79}
80
81static inline const void *
82get_key(const void *p, const void *end, struct crypto_tfm **res)
83{
84 struct xdr_netobj key;
85 int alg, alg_mode;
86 char *alg_name;
87
88 p = simple_get_bytes(p, end, &alg, sizeof(alg));
89 if (IS_ERR(p))
90 goto out_err;
91 p = simple_get_netobj(p, end, &key);
92 if (IS_ERR(p))
93 goto out_err;
94
95 switch (alg) {
96 case ENCTYPE_DES_CBC_RAW:
97 alg_name = "des";
98 alg_mode = CRYPTO_TFM_MODE_CBC;
99 break;
100 default:
101 dprintk("RPC: get_key: unsupported algorithm %d\n", alg);
102 goto out_err_free_key;
103 }
104 if (!(*res = crypto_alloc_tfm(alg_name, alg_mode)))
105 goto out_err_free_key;
106 if (crypto_cipher_setkey(*res, key.data, key.len))
107 goto out_err_free_tfm;
108
109 kfree(key.data);
110 return p;
111
112out_err_free_tfm:
113 crypto_free_tfm(*res);
114out_err_free_key:
115 kfree(key.data);
116 p = ERR_PTR(-EINVAL);
117out_err:
118 return p;
119}
120
121static int
122gss_import_sec_context_kerberos(const void *p,
123 size_t len,
124 struct gss_ctx *ctx_id)
125{
126 const void *end = (const void *)((const char *)p + len);
127 struct krb5_ctx *ctx;
128
129 if (!(ctx = kmalloc(sizeof(*ctx), GFP_KERNEL)))
130 goto out_err;
131 memset(ctx, 0, sizeof(*ctx));
132
133 p = simple_get_bytes(p, end, &ctx->initiate, sizeof(ctx->initiate));
134 if (IS_ERR(p))
135 goto out_err_free_ctx;
136 p = simple_get_bytes(p, end, &ctx->seed_init, sizeof(ctx->seed_init));
137 if (IS_ERR(p))
138 goto out_err_free_ctx;
139 p = simple_get_bytes(p, end, ctx->seed, sizeof(ctx->seed));
140 if (IS_ERR(p))
141 goto out_err_free_ctx;
142 p = simple_get_bytes(p, end, &ctx->signalg, sizeof(ctx->signalg));
143 if (IS_ERR(p))
144 goto out_err_free_ctx;
145 p = simple_get_bytes(p, end, &ctx->sealalg, sizeof(ctx->sealalg));
146 if (IS_ERR(p))
147 goto out_err_free_ctx;
148 p = simple_get_bytes(p, end, &ctx->endtime, sizeof(ctx->endtime));
149 if (IS_ERR(p))
150 goto out_err_free_ctx;
151 p = simple_get_bytes(p, end, &ctx->seq_send, sizeof(ctx->seq_send));
152 if (IS_ERR(p))
153 goto out_err_free_ctx;
154 p = simple_get_netobj(p, end, &ctx->mech_used);
155 if (IS_ERR(p))
156 goto out_err_free_ctx;
157 p = get_key(p, end, &ctx->enc);
158 if (IS_ERR(p))
159 goto out_err_free_mech;
160 p = get_key(p, end, &ctx->seq);
161 if (IS_ERR(p))
162 goto out_err_free_key1;
163 if (p != end) {
164 p = ERR_PTR(-EFAULT);
165 goto out_err_free_key2;
166 }
167
168 ctx_id->internal_ctx_id = ctx;
169 dprintk("RPC: Succesfully imported new context.\n");
170 return 0;
171
172out_err_free_key2:
173 crypto_free_tfm(ctx->seq);
174out_err_free_key1:
175 crypto_free_tfm(ctx->enc);
176out_err_free_mech:
177 kfree(ctx->mech_used.data);
178out_err_free_ctx:
179 kfree(ctx);
180out_err:
181 return PTR_ERR(p);
182}
183
184static void
185gss_delete_sec_context_kerberos(void *internal_ctx) {
186 struct krb5_ctx *kctx = internal_ctx;
187
188 if (kctx->seq)
189 crypto_free_tfm(kctx->seq);
190 if (kctx->enc)
191 crypto_free_tfm(kctx->enc);
192 if (kctx->mech_used.data)
193 kfree(kctx->mech_used.data);
194 kfree(kctx);
195}
196
197static u32
198gss_verify_mic_kerberos(struct gss_ctx *ctx,
199 struct xdr_buf *message,
200 struct xdr_netobj *mic_token,
201 u32 *qstate) {
202 u32 maj_stat = 0;
203 int qop_state;
204 struct krb5_ctx *kctx = ctx->internal_ctx_id;
205
206 maj_stat = krb5_read_token(kctx, mic_token, message, &qop_state,
207 KG_TOK_MIC_MSG);
208 if (!maj_stat && qop_state)
209 *qstate = qop_state;
210
211 dprintk("RPC: gss_verify_mic_kerberos returning %d\n", maj_stat);
212 return maj_stat;
213}
214
215static u32
216gss_get_mic_kerberos(struct gss_ctx *ctx,
217 u32 qop,
218 struct xdr_buf *message,
219 struct xdr_netobj *mic_token) {
220 u32 err = 0;
221 struct krb5_ctx *kctx = ctx->internal_ctx_id;
222
223 err = krb5_make_token(kctx, qop, message, mic_token, KG_TOK_MIC_MSG);
224
225 dprintk("RPC: gss_get_mic_kerberos returning %d\n",err);
226
227 return err;
228}
229
230static struct gss_api_ops gss_kerberos_ops = {
231 .gss_import_sec_context = gss_import_sec_context_kerberos,
232 .gss_get_mic = gss_get_mic_kerberos,
233 .gss_verify_mic = gss_verify_mic_kerberos,
234 .gss_delete_sec_context = gss_delete_sec_context_kerberos,
235};
236
237static struct pf_desc gss_kerberos_pfs[] = {
238 [0] = {
239 .pseudoflavor = RPC_AUTH_GSS_KRB5,
240 .service = RPC_GSS_SVC_NONE,
241 .name = "krb5",
242 },
243 [1] = {
244 .pseudoflavor = RPC_AUTH_GSS_KRB5I,
245 .service = RPC_GSS_SVC_INTEGRITY,
246 .name = "krb5i",
247 },
248};
249
250static struct gss_api_mech gss_kerberos_mech = {
251 .gm_name = "krb5",
252 .gm_owner = THIS_MODULE,
253 .gm_ops = &gss_kerberos_ops,
254 .gm_pf_num = ARRAY_SIZE(gss_kerberos_pfs),
255 .gm_pfs = gss_kerberos_pfs,
256};
257
258static int __init init_kerberos_module(void)
259{
260 int status;
261
262 status = gss_mech_register(&gss_kerberos_mech);
263 if (status)
264 printk("Failed to register kerberos gss mechanism!\n");
265 return status;
266}
267
268static void __exit cleanup_kerberos_module(void)
269{
270 gss_mech_unregister(&gss_kerberos_mech);
271}
272
273MODULE_LICENSE("GPL");
274module_init(init_kerberos_module);
275module_exit(cleanup_kerberos_module);